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[emacs.git] / src / coding.c
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1 /* Coding system handler (conversion, detection, etc).
2 Copyright (C) 2001-2011 Free Software Foundation, Inc.
3 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 2005, 2006, 2007, 2008, 2009, 2010, 2011
5 National Institute of Advanced Industrial Science and Technology (AIST)
6 Registration Number H14PRO021
7 Copyright (C) 2003
8 National Institute of Advanced Industrial Science and Technology (AIST)
9 Registration Number H13PRO009
10
11 This file is part of GNU Emacs.
12
13 GNU Emacs is free software: you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation, either version 3 of the License, or
16 (at your option) any later version.
17
18 GNU Emacs is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
25
26 /*** TABLE OF CONTENTS ***
27
28 0. General comments
29 1. Preamble
30 2. Emacs' internal format (emacs-utf-8) handlers
31 3. UTF-8 handlers
32 4. UTF-16 handlers
33 5. Charset-base coding systems handlers
34 6. emacs-mule (old Emacs' internal format) handlers
35 7. ISO2022 handlers
36 8. Shift-JIS and BIG5 handlers
37 9. CCL handlers
38 10. C library functions
39 11. Emacs Lisp library functions
40 12. Postamble
41
42 */
43
44 /*** 0. General comments ***
45
46
47 CODING SYSTEM
48
49 A coding system is an object for an encoding mechanism that contains
50 information about how to convert byte sequences to character
51 sequences and vice versa. When we say "decode", it means converting
52 a byte sequence of a specific coding system into a character
53 sequence that is represented by Emacs' internal coding system
54 `emacs-utf-8', and when we say "encode", it means converting a
55 character sequence of emacs-utf-8 to a byte sequence of a specific
56 coding system.
57
58 In Emacs Lisp, a coding system is represented by a Lisp symbol. In
59 C level, a coding system is represented by a vector of attributes
60 stored in the hash table Vcharset_hash_table. The conversion from
61 coding system symbol to attributes vector is done by looking up
62 Vcharset_hash_table by the symbol.
63
64 Coding systems are classified into the following types depending on
65 the encoding mechanism. Here's a brief description of the types.
66
67 o UTF-8
68
69 o UTF-16
70
71 o Charset-base coding system
72
73 A coding system defined by one or more (coded) character sets.
74 Decoding and encoding are done by a code converter defined for each
75 character set.
76
77 o Old Emacs internal format (emacs-mule)
78
79 The coding system adopted by old versions of Emacs (20 and 21).
80
81 o ISO2022-base coding system
82
83 The most famous coding system for multiple character sets. X's
84 Compound Text, various EUCs (Extended Unix Code), and coding systems
85 used in the Internet communication such as ISO-2022-JP are all
86 variants of ISO2022.
87
88 o SJIS (or Shift-JIS or MS-Kanji-Code)
89
90 A coding system to encode character sets: ASCII, JISX0201, and
91 JISX0208. Widely used for PC's in Japan. Details are described in
92 section 8.
93
94 o BIG5
95
96 A coding system to encode character sets: ASCII and Big5. Widely
97 used for Chinese (mainly in Taiwan and Hong Kong). Details are
98 described in section 8. In this file, when we write "big5" (all
99 lowercase), we mean the coding system, and when we write "Big5"
100 (capitalized), we mean the character set.
101
102 o CCL
103
104 If a user wants to decode/encode text encoded in a coding system
105 not listed above, he can supply a decoder and an encoder for it in
106 CCL (Code Conversion Language) programs. Emacs executes the CCL
107 program while decoding/encoding.
108
109 o Raw-text
110
111 A coding system for text containing raw eight-bit data. Emacs
112 treats each byte of source text as a character (except for
113 end-of-line conversion).
114
115 o No-conversion
116
117 Like raw text, but don't do end-of-line conversion.
118
119
120 END-OF-LINE FORMAT
121
122 How text end-of-line is encoded depends on operating system. For
123 instance, Unix's format is just one byte of LF (line-feed) code,
124 whereas DOS's format is two-byte sequence of `carriage-return' and
125 `line-feed' codes. MacOS's format is usually one byte of
126 `carriage-return'.
127
128 Since text character encoding and end-of-line encoding are
129 independent, any coding system described above can take any format
130 of end-of-line (except for no-conversion).
131
132 STRUCT CODING_SYSTEM
133
134 Before using a coding system for code conversion (i.e. decoding and
135 encoding), we setup a structure of type `struct coding_system'.
136 This structure keeps various information about a specific code
137 conversion (e.g. the location of source and destination data).
138
139 */
140
141 /* COMMON MACROS */
142
143
144 /*** GENERAL NOTES on `detect_coding_XXX ()' functions ***
145
146 These functions check if a byte sequence specified as a source in
147 CODING conforms to the format of XXX, and update the members of
148 DETECT_INFO.
149
150 Return 1 if the byte sequence conforms to XXX, otherwise return 0.
151
152 Below is the template of these functions. */
153
154 #if 0
155 static int
156 detect_coding_XXX (struct coding_system *coding,
157 struct coding_detection_info *detect_info)
158 {
159 const unsigned char *src = coding->source;
160 const unsigned char *src_end = coding->source + coding->src_bytes;
161 int multibytep = coding->src_multibyte;
162 EMACS_INT consumed_chars = 0;
163 int found = 0;
164 ...;
165
166 while (1)
167 {
168 /* Get one byte from the source. If the source is exhausted, jump
169 to no_more_source:. */
170 ONE_MORE_BYTE (c);
171
172 if (! __C_conforms_to_XXX___ (c))
173 break;
174 if (! __C_strongly_suggests_XXX__ (c))
175 found = CATEGORY_MASK_XXX;
176 }
177 /* The byte sequence is invalid for XXX. */
178 detect_info->rejected |= CATEGORY_MASK_XXX;
179 return 0;
180
181 no_more_source:
182 /* The source exhausted successfully. */
183 detect_info->found |= found;
184 return 1;
185 }
186 #endif
187
188 /*** GENERAL NOTES on `decode_coding_XXX ()' functions ***
189
190 These functions decode a byte sequence specified as a source by
191 CODING. The resulting multibyte text goes to a place pointed to by
192 CODING->charbuf, the length of which should not exceed
193 CODING->charbuf_size;
194
195 These functions set the information of original and decoded texts in
196 CODING->consumed, CODING->consumed_char, and CODING->charbuf_used.
197 They also set CODING->result to one of CODING_RESULT_XXX indicating
198 how the decoding is finished.
199
200 Below is the template of these functions. */
201
202 #if 0
203 static void
204 decode_coding_XXXX (struct coding_system *coding)
205 {
206 const unsigned char *src = coding->source + coding->consumed;
207 const unsigned char *src_end = coding->source + coding->src_bytes;
208 /* SRC_BASE remembers the start position in source in each loop.
209 The loop will be exited when there's not enough source code, or
210 when there's no room in CHARBUF for a decoded character. */
211 const unsigned char *src_base;
212 /* A buffer to produce decoded characters. */
213 int *charbuf = coding->charbuf + coding->charbuf_used;
214 int *charbuf_end = coding->charbuf + coding->charbuf_size;
215 int multibytep = coding->src_multibyte;
216
217 while (1)
218 {
219 src_base = src;
220 if (charbuf < charbuf_end)
221 /* No more room to produce a decoded character. */
222 break;
223 ONE_MORE_BYTE (c);
224 /* Decode it. */
225 }
226
227 no_more_source:
228 if (src_base < src_end
229 && coding->mode & CODING_MODE_LAST_BLOCK)
230 /* If the source ends by partial bytes to construct a character,
231 treat them as eight-bit raw data. */
232 while (src_base < src_end && charbuf < charbuf_end)
233 *charbuf++ = *src_base++;
234 /* Remember how many bytes and characters we consumed. If the
235 source is multibyte, the bytes and chars are not identical. */
236 coding->consumed = coding->consumed_char = src_base - coding->source;
237 /* Remember how many characters we produced. */
238 coding->charbuf_used = charbuf - coding->charbuf;
239 }
240 #endif
241
242 /*** GENERAL NOTES on `encode_coding_XXX ()' functions ***
243
244 These functions encode SRC_BYTES length text at SOURCE of Emacs'
245 internal multibyte format by CODING. The resulting byte sequence
246 goes to a place pointed to by DESTINATION, the length of which
247 should not exceed DST_BYTES.
248
249 These functions set the information of original and encoded texts in
250 the members produced, produced_char, consumed, and consumed_char of
251 the structure *CODING. They also set the member result to one of
252 CODING_RESULT_XXX indicating how the encoding finished.
253
254 DST_BYTES zero means that source area and destination area are
255 overlapped, which means that we can produce a encoded text until it
256 reaches at the head of not-yet-encoded source text.
257
258 Below is a template of these functions. */
259 #if 0
260 static void
261 encode_coding_XXX (struct coding_system *coding)
262 {
263 int multibytep = coding->dst_multibyte;
264 int *charbuf = coding->charbuf;
265 int *charbuf_end = charbuf->charbuf + coding->charbuf_used;
266 unsigned char *dst = coding->destination + coding->produced;
267 unsigned char *dst_end = coding->destination + coding->dst_bytes;
268 unsigned char *adjusted_dst_end = dst_end - _MAX_BYTES_PRODUCED_IN_LOOP_;
269 EMACS_INT produced_chars = 0;
270
271 for (; charbuf < charbuf_end && dst < adjusted_dst_end; charbuf++)
272 {
273 int c = *charbuf;
274 /* Encode C into DST, and increment DST. */
275 }
276 label_no_more_destination:
277 /* How many chars and bytes we produced. */
278 coding->produced_char += produced_chars;
279 coding->produced = dst - coding->destination;
280 }
281 #endif
282
283 \f
284 /*** 1. Preamble ***/
285
286 #include <config.h>
287 #include <stdio.h>
288 #include <setjmp.h>
289
290 #include "lisp.h"
291 #include "buffer.h"
292 #include "character.h"
293 #include "charset.h"
294 #include "ccl.h"
295 #include "composite.h"
296 #include "coding.h"
297 #include "window.h"
298 #include "frame.h"
299 #include "termhooks.h"
300
301 Lisp_Object Vcoding_system_hash_table;
302
303 static Lisp_Object Qcoding_system, Qeol_type;
304 static Lisp_Object Qcoding_aliases;
305 Lisp_Object Qunix, Qdos;
306 Lisp_Object Qbuffer_file_coding_system;
307 static Lisp_Object Qpost_read_conversion, Qpre_write_conversion;
308 static Lisp_Object Qdefault_char;
309 Lisp_Object Qno_conversion, Qundecided;
310 Lisp_Object Qcharset, Qutf_8;
311 static Lisp_Object Qiso_2022;
312 static Lisp_Object Qutf_16, Qshift_jis, Qbig5;
313 static Lisp_Object Qbig, Qlittle;
314 static Lisp_Object Qcoding_system_history;
315 static Lisp_Object Qvalid_codes;
316 static Lisp_Object QCcategory, QCmnemonic, QCdefault_char;
317 static Lisp_Object QCdecode_translation_table, QCencode_translation_table;
318 static Lisp_Object QCpost_read_conversion, QCpre_write_conversion;
319 static Lisp_Object QCascii_compatible_p;
320
321 Lisp_Object Qcall_process, Qcall_process_region;
322 Lisp_Object Qstart_process, Qopen_network_stream;
323 static Lisp_Object Qtarget_idx;
324
325 static Lisp_Object Qinsufficient_source, Qinconsistent_eol, Qinvalid_source;
326 static Lisp_Object Qinterrupted, Qinsufficient_memory;
327
328 /* If a symbol has this property, evaluate the value to define the
329 symbol as a coding system. */
330 static Lisp_Object Qcoding_system_define_form;
331
332 /* Format of end-of-line decided by system. This is Qunix on
333 Unix and Mac, Qdos on DOS/Windows.
334 This has an effect only for external encoding (i.e. for output to
335 file and process), not for in-buffer or Lisp string encoding. */
336 static Lisp_Object system_eol_type;
337
338 #ifdef emacs
339
340 Lisp_Object Qcoding_system_p, Qcoding_system_error;
341
342 /* Coding system emacs-mule and raw-text are for converting only
343 end-of-line format. */
344 Lisp_Object Qemacs_mule, Qraw_text;
345 Lisp_Object Qutf_8_emacs;
346
347 /* Coding-systems are handed between Emacs Lisp programs and C internal
348 routines by the following three variables. */
349 /* Coding system to be used to encode text for terminal display when
350 terminal coding system is nil. */
351 struct coding_system safe_terminal_coding;
352
353 #endif /* emacs */
354
355 Lisp_Object Qtranslation_table;
356 Lisp_Object Qtranslation_table_id;
357 static Lisp_Object Qtranslation_table_for_decode;
358 static Lisp_Object Qtranslation_table_for_encode;
359
360 /* Two special coding systems. */
361 static Lisp_Object Vsjis_coding_system;
362 static Lisp_Object Vbig5_coding_system;
363
364 /* ISO2022 section */
365
366 #define CODING_ISO_INITIAL(coding, reg) \
367 (XINT (AREF (AREF (CODING_ID_ATTRS ((coding)->id), \
368 coding_attr_iso_initial), \
369 reg)))
370
371
372 #define CODING_ISO_REQUEST(coding, charset_id) \
373 (((charset_id) <= (coding)->max_charset_id \
374 ? ((coding)->safe_charsets[charset_id] != 255 \
375 ? (coding)->safe_charsets[charset_id] \
376 : -1) \
377 : -1))
378
379
380 #define CODING_ISO_FLAGS(coding) \
381 ((coding)->spec.iso_2022.flags)
382 #define CODING_ISO_DESIGNATION(coding, reg) \
383 ((coding)->spec.iso_2022.current_designation[reg])
384 #define CODING_ISO_INVOCATION(coding, plane) \
385 ((coding)->spec.iso_2022.current_invocation[plane])
386 #define CODING_ISO_SINGLE_SHIFTING(coding) \
387 ((coding)->spec.iso_2022.single_shifting)
388 #define CODING_ISO_BOL(coding) \
389 ((coding)->spec.iso_2022.bol)
390 #define CODING_ISO_INVOKED_CHARSET(coding, plane) \
391 CODING_ISO_DESIGNATION ((coding), CODING_ISO_INVOCATION ((coding), (plane)))
392 #define CODING_ISO_CMP_STATUS(coding) \
393 (&(coding)->spec.iso_2022.cmp_status)
394 #define CODING_ISO_EXTSEGMENT_LEN(coding) \
395 ((coding)->spec.iso_2022.ctext_extended_segment_len)
396 #define CODING_ISO_EMBEDDED_UTF_8(coding) \
397 ((coding)->spec.iso_2022.embedded_utf_8)
398
399 /* Control characters of ISO2022. */
400 /* code */ /* function */
401 #define ISO_CODE_SO 0x0E /* shift-out */
402 #define ISO_CODE_SI 0x0F /* shift-in */
403 #define ISO_CODE_SS2_7 0x19 /* single-shift-2 for 7-bit code */
404 #define ISO_CODE_ESC 0x1B /* escape */
405 #define ISO_CODE_SS2 0x8E /* single-shift-2 */
406 #define ISO_CODE_SS3 0x8F /* single-shift-3 */
407 #define ISO_CODE_CSI 0x9B /* control-sequence-introducer */
408
409 /* All code (1-byte) of ISO2022 is classified into one of the
410 followings. */
411 enum iso_code_class_type
412 {
413 ISO_control_0, /* Control codes in the range
414 0x00..0x1F and 0x7F, except for the
415 following 5 codes. */
416 ISO_shift_out, /* ISO_CODE_SO (0x0E) */
417 ISO_shift_in, /* ISO_CODE_SI (0x0F) */
418 ISO_single_shift_2_7, /* ISO_CODE_SS2_7 (0x19) */
419 ISO_escape, /* ISO_CODE_SO (0x1B) */
420 ISO_control_1, /* Control codes in the range
421 0x80..0x9F, except for the
422 following 3 codes. */
423 ISO_single_shift_2, /* ISO_CODE_SS2 (0x8E) */
424 ISO_single_shift_3, /* ISO_CODE_SS3 (0x8F) */
425 ISO_control_sequence_introducer, /* ISO_CODE_CSI (0x9B) */
426 ISO_0x20_or_0x7F, /* Codes of the values 0x20 or 0x7F. */
427 ISO_graphic_plane_0, /* Graphic codes in the range 0x21..0x7E. */
428 ISO_0xA0_or_0xFF, /* Codes of the values 0xA0 or 0xFF. */
429 ISO_graphic_plane_1 /* Graphic codes in the range 0xA1..0xFE. */
430 };
431
432 /** The macros CODING_ISO_FLAG_XXX defines a flag bit of the
433 `iso-flags' attribute of an iso2022 coding system. */
434
435 /* If set, produce long-form designation sequence (e.g. ESC $ ( A)
436 instead of the correct short-form sequence (e.g. ESC $ A). */
437 #define CODING_ISO_FLAG_LONG_FORM 0x0001
438
439 /* If set, reset graphic planes and registers at end-of-line to the
440 initial state. */
441 #define CODING_ISO_FLAG_RESET_AT_EOL 0x0002
442
443 /* If set, reset graphic planes and registers before any control
444 characters to the initial state. */
445 #define CODING_ISO_FLAG_RESET_AT_CNTL 0x0004
446
447 /* If set, encode by 7-bit environment. */
448 #define CODING_ISO_FLAG_SEVEN_BITS 0x0008
449
450 /* If set, use locking-shift function. */
451 #define CODING_ISO_FLAG_LOCKING_SHIFT 0x0010
452
453 /* If set, use single-shift function. Overwrite
454 CODING_ISO_FLAG_LOCKING_SHIFT. */
455 #define CODING_ISO_FLAG_SINGLE_SHIFT 0x0020
456
457 /* If set, use designation escape sequence. */
458 #define CODING_ISO_FLAG_DESIGNATION 0x0040
459
460 /* If set, produce revision number sequence. */
461 #define CODING_ISO_FLAG_REVISION 0x0080
462
463 /* If set, produce ISO6429's direction specifying sequence. */
464 #define CODING_ISO_FLAG_DIRECTION 0x0100
465
466 /* If set, assume designation states are reset at beginning of line on
467 output. */
468 #define CODING_ISO_FLAG_INIT_AT_BOL 0x0200
469
470 /* If set, designation sequence should be placed at beginning of line
471 on output. */
472 #define CODING_ISO_FLAG_DESIGNATE_AT_BOL 0x0400
473
474 /* If set, do not encode unsafe characters on output. */
475 #define CODING_ISO_FLAG_SAFE 0x0800
476
477 /* If set, extra latin codes (128..159) are accepted as a valid code
478 on input. */
479 #define CODING_ISO_FLAG_LATIN_EXTRA 0x1000
480
481 #define CODING_ISO_FLAG_COMPOSITION 0x2000
482
483 /* #define CODING_ISO_FLAG_EUC_TW_SHIFT 0x4000 */
484
485 #define CODING_ISO_FLAG_USE_ROMAN 0x8000
486
487 #define CODING_ISO_FLAG_USE_OLDJIS 0x10000
488
489 #define CODING_ISO_FLAG_FULL_SUPPORT 0x100000
490
491 /* A character to be produced on output if encoding of the original
492 character is prohibited by CODING_ISO_FLAG_SAFE. */
493 #define CODING_INHIBIT_CHARACTER_SUBSTITUTION '?'
494
495 /* UTF-8 section */
496 #define CODING_UTF_8_BOM(coding) \
497 ((coding)->spec.utf_8_bom)
498
499 /* UTF-16 section */
500 #define CODING_UTF_16_BOM(coding) \
501 ((coding)->spec.utf_16.bom)
502
503 #define CODING_UTF_16_ENDIAN(coding) \
504 ((coding)->spec.utf_16.endian)
505
506 #define CODING_UTF_16_SURROGATE(coding) \
507 ((coding)->spec.utf_16.surrogate)
508
509
510 /* CCL section */
511 #define CODING_CCL_DECODER(coding) \
512 AREF (CODING_ID_ATTRS ((coding)->id), coding_attr_ccl_decoder)
513 #define CODING_CCL_ENCODER(coding) \
514 AREF (CODING_ID_ATTRS ((coding)->id), coding_attr_ccl_encoder)
515 #define CODING_CCL_VALIDS(coding) \
516 (SDATA (AREF (CODING_ID_ATTRS ((coding)->id), coding_attr_ccl_valids)))
517
518 /* Index for each coding category in `coding_categories' */
519
520 enum coding_category
521 {
522 coding_category_iso_7,
523 coding_category_iso_7_tight,
524 coding_category_iso_8_1,
525 coding_category_iso_8_2,
526 coding_category_iso_7_else,
527 coding_category_iso_8_else,
528 coding_category_utf_8_auto,
529 coding_category_utf_8_nosig,
530 coding_category_utf_8_sig,
531 coding_category_utf_16_auto,
532 coding_category_utf_16_be,
533 coding_category_utf_16_le,
534 coding_category_utf_16_be_nosig,
535 coding_category_utf_16_le_nosig,
536 coding_category_charset,
537 coding_category_sjis,
538 coding_category_big5,
539 coding_category_ccl,
540 coding_category_emacs_mule,
541 /* All above are targets of code detection. */
542 coding_category_raw_text,
543 coding_category_undecided,
544 coding_category_max
545 };
546
547 /* Definitions of flag bits used in detect_coding_XXXX. */
548 #define CATEGORY_MASK_ISO_7 (1 << coding_category_iso_7)
549 #define CATEGORY_MASK_ISO_7_TIGHT (1 << coding_category_iso_7_tight)
550 #define CATEGORY_MASK_ISO_8_1 (1 << coding_category_iso_8_1)
551 #define CATEGORY_MASK_ISO_8_2 (1 << coding_category_iso_8_2)
552 #define CATEGORY_MASK_ISO_7_ELSE (1 << coding_category_iso_7_else)
553 #define CATEGORY_MASK_ISO_8_ELSE (1 << coding_category_iso_8_else)
554 #define CATEGORY_MASK_UTF_8_AUTO (1 << coding_category_utf_8_auto)
555 #define CATEGORY_MASK_UTF_8_NOSIG (1 << coding_category_utf_8_nosig)
556 #define CATEGORY_MASK_UTF_8_SIG (1 << coding_category_utf_8_sig)
557 #define CATEGORY_MASK_UTF_16_AUTO (1 << coding_category_utf_16_auto)
558 #define CATEGORY_MASK_UTF_16_BE (1 << coding_category_utf_16_be)
559 #define CATEGORY_MASK_UTF_16_LE (1 << coding_category_utf_16_le)
560 #define CATEGORY_MASK_UTF_16_BE_NOSIG (1 << coding_category_utf_16_be_nosig)
561 #define CATEGORY_MASK_UTF_16_LE_NOSIG (1 << coding_category_utf_16_le_nosig)
562 #define CATEGORY_MASK_CHARSET (1 << coding_category_charset)
563 #define CATEGORY_MASK_SJIS (1 << coding_category_sjis)
564 #define CATEGORY_MASK_BIG5 (1 << coding_category_big5)
565 #define CATEGORY_MASK_CCL (1 << coding_category_ccl)
566 #define CATEGORY_MASK_EMACS_MULE (1 << coding_category_emacs_mule)
567 #define CATEGORY_MASK_RAW_TEXT (1 << coding_category_raw_text)
568
569 /* This value is returned if detect_coding_mask () find nothing other
570 than ASCII characters. */
571 #define CATEGORY_MASK_ANY \
572 (CATEGORY_MASK_ISO_7 \
573 | CATEGORY_MASK_ISO_7_TIGHT \
574 | CATEGORY_MASK_ISO_8_1 \
575 | CATEGORY_MASK_ISO_8_2 \
576 | CATEGORY_MASK_ISO_7_ELSE \
577 | CATEGORY_MASK_ISO_8_ELSE \
578 | CATEGORY_MASK_UTF_8_AUTO \
579 | CATEGORY_MASK_UTF_8_NOSIG \
580 | CATEGORY_MASK_UTF_8_SIG \
581 | CATEGORY_MASK_UTF_16_AUTO \
582 | CATEGORY_MASK_UTF_16_BE \
583 | CATEGORY_MASK_UTF_16_LE \
584 | CATEGORY_MASK_UTF_16_BE_NOSIG \
585 | CATEGORY_MASK_UTF_16_LE_NOSIG \
586 | CATEGORY_MASK_CHARSET \
587 | CATEGORY_MASK_SJIS \
588 | CATEGORY_MASK_BIG5 \
589 | CATEGORY_MASK_CCL \
590 | CATEGORY_MASK_EMACS_MULE)
591
592
593 #define CATEGORY_MASK_ISO_7BIT \
594 (CATEGORY_MASK_ISO_7 | CATEGORY_MASK_ISO_7_TIGHT)
595
596 #define CATEGORY_MASK_ISO_8BIT \
597 (CATEGORY_MASK_ISO_8_1 | CATEGORY_MASK_ISO_8_2)
598
599 #define CATEGORY_MASK_ISO_ELSE \
600 (CATEGORY_MASK_ISO_7_ELSE | CATEGORY_MASK_ISO_8_ELSE)
601
602 #define CATEGORY_MASK_ISO_ESCAPE \
603 (CATEGORY_MASK_ISO_7 \
604 | CATEGORY_MASK_ISO_7_TIGHT \
605 | CATEGORY_MASK_ISO_7_ELSE \
606 | CATEGORY_MASK_ISO_8_ELSE)
607
608 #define CATEGORY_MASK_ISO \
609 ( CATEGORY_MASK_ISO_7BIT \
610 | CATEGORY_MASK_ISO_8BIT \
611 | CATEGORY_MASK_ISO_ELSE)
612
613 #define CATEGORY_MASK_UTF_16 \
614 (CATEGORY_MASK_UTF_16_AUTO \
615 | CATEGORY_MASK_UTF_16_BE \
616 | CATEGORY_MASK_UTF_16_LE \
617 | CATEGORY_MASK_UTF_16_BE_NOSIG \
618 | CATEGORY_MASK_UTF_16_LE_NOSIG)
619
620 #define CATEGORY_MASK_UTF_8 \
621 (CATEGORY_MASK_UTF_8_AUTO \
622 | CATEGORY_MASK_UTF_8_NOSIG \
623 | CATEGORY_MASK_UTF_8_SIG)
624
625 /* Table of coding categories (Lisp symbols). This variable is for
626 internal use only. */
627 static Lisp_Object Vcoding_category_table;
628
629 /* Table of coding-categories ordered by priority. */
630 static enum coding_category coding_priorities[coding_category_max];
631
632 /* Nth element is a coding context for the coding system bound to the
633 Nth coding category. */
634 static struct coding_system coding_categories[coding_category_max];
635
636 /*** Commonly used macros and functions ***/
637
638 #ifndef min
639 #define min(a, b) ((a) < (b) ? (a) : (b))
640 #endif
641 #ifndef max
642 #define max(a, b) ((a) > (b) ? (a) : (b))
643 #endif
644
645 #define CODING_GET_INFO(coding, attrs, charset_list) \
646 do { \
647 (attrs) = CODING_ID_ATTRS ((coding)->id); \
648 (charset_list) = CODING_ATTR_CHARSET_LIST (attrs); \
649 } while (0)
650
651
652 /* Safely get one byte from the source text pointed by SRC which ends
653 at SRC_END, and set C to that byte. If there are not enough bytes
654 in the source, it jumps to `no_more_source'. If multibytep is
655 nonzero, and a multibyte character is found at SRC, set C to the
656 negative value of the character code. The caller should declare
657 and set these variables appropriately in advance:
658 src, src_end, multibytep */
659
660 #define ONE_MORE_BYTE(c) \
661 do { \
662 if (src == src_end) \
663 { \
664 if (src_base < src) \
665 record_conversion_result \
666 (coding, CODING_RESULT_INSUFFICIENT_SRC); \
667 goto no_more_source; \
668 } \
669 c = *src++; \
670 if (multibytep && (c & 0x80)) \
671 { \
672 if ((c & 0xFE) == 0xC0) \
673 c = ((c & 1) << 6) | *src++; \
674 else \
675 { \
676 src--; \
677 c = - string_char (src, &src, NULL); \
678 record_conversion_result \
679 (coding, CODING_RESULT_INVALID_SRC); \
680 } \
681 } \
682 consumed_chars++; \
683 } while (0)
684
685 /* Safely get two bytes from the source text pointed by SRC which ends
686 at SRC_END, and set C1 and C2 to those bytes while skipping the
687 heading multibyte characters. If there are not enough bytes in the
688 source, it jumps to `no_more_source'. If multibytep is nonzero and
689 a multibyte character is found for C2, set C2 to the negative value
690 of the character code. The caller should declare and set these
691 variables appropriately in advance:
692 src, src_end, multibytep
693 It is intended that this macro is used in detect_coding_utf_16. */
694
695 #define TWO_MORE_BYTES(c1, c2) \
696 do { \
697 do { \
698 if (src == src_end) \
699 goto no_more_source; \
700 c1 = *src++; \
701 if (multibytep && (c1 & 0x80)) \
702 { \
703 if ((c1 & 0xFE) == 0xC0) \
704 c1 = ((c1 & 1) << 6) | *src++; \
705 else \
706 { \
707 src += BYTES_BY_CHAR_HEAD (c1) - 1; \
708 c1 = -1; \
709 } \
710 } \
711 } while (c1 < 0); \
712 if (src == src_end) \
713 goto no_more_source; \
714 c2 = *src++; \
715 if (multibytep && (c2 & 0x80)) \
716 { \
717 if ((c2 & 0xFE) == 0xC0) \
718 c2 = ((c2 & 1) << 6) | *src++; \
719 else \
720 c2 = -1; \
721 } \
722 } while (0)
723
724
725 /* Store a byte C in the place pointed by DST and increment DST to the
726 next free point, and increment PRODUCED_CHARS. The caller should
727 assure that C is 0..127, and declare and set the variable `dst'
728 appropriately in advance.
729 */
730
731
732 #define EMIT_ONE_ASCII_BYTE(c) \
733 do { \
734 produced_chars++; \
735 *dst++ = (c); \
736 } while (0)
737
738
739 /* Like EMIT_ONE_ASCII_BYTE but store two bytes; C1 and C2. */
740
741 #define EMIT_TWO_ASCII_BYTES(c1, c2) \
742 do { \
743 produced_chars += 2; \
744 *dst++ = (c1), *dst++ = (c2); \
745 } while (0)
746
747
748 /* Store a byte C in the place pointed by DST and increment DST to the
749 next free point, and increment PRODUCED_CHARS. If MULTIBYTEP is
750 nonzero, store in an appropriate multibyte from. The caller should
751 declare and set the variables `dst' and `multibytep' appropriately
752 in advance. */
753
754 #define EMIT_ONE_BYTE(c) \
755 do { \
756 produced_chars++; \
757 if (multibytep) \
758 { \
759 unsigned ch = (c); \
760 if (ch >= 0x80) \
761 ch = BYTE8_TO_CHAR (ch); \
762 CHAR_STRING_ADVANCE (ch, dst); \
763 } \
764 else \
765 *dst++ = (c); \
766 } while (0)
767
768
769 /* Like EMIT_ONE_BYTE, but emit two bytes; C1 and C2. */
770
771 #define EMIT_TWO_BYTES(c1, c2) \
772 do { \
773 produced_chars += 2; \
774 if (multibytep) \
775 { \
776 unsigned ch; \
777 \
778 ch = (c1); \
779 if (ch >= 0x80) \
780 ch = BYTE8_TO_CHAR (ch); \
781 CHAR_STRING_ADVANCE (ch, dst); \
782 ch = (c2); \
783 if (ch >= 0x80) \
784 ch = BYTE8_TO_CHAR (ch); \
785 CHAR_STRING_ADVANCE (ch, dst); \
786 } \
787 else \
788 { \
789 *dst++ = (c1); \
790 *dst++ = (c2); \
791 } \
792 } while (0)
793
794
795 #define EMIT_THREE_BYTES(c1, c2, c3) \
796 do { \
797 EMIT_ONE_BYTE (c1); \
798 EMIT_TWO_BYTES (c2, c3); \
799 } while (0)
800
801
802 #define EMIT_FOUR_BYTES(c1, c2, c3, c4) \
803 do { \
804 EMIT_TWO_BYTES (c1, c2); \
805 EMIT_TWO_BYTES (c3, c4); \
806 } while (0)
807
808
809 /* Prototypes for static functions. */
810 static void record_conversion_result (struct coding_system *coding,
811 enum coding_result_code result);
812 static int detect_coding_utf_8 (struct coding_system *,
813 struct coding_detection_info *info);
814 static void decode_coding_utf_8 (struct coding_system *);
815 static int encode_coding_utf_8 (struct coding_system *);
816
817 static int detect_coding_utf_16 (struct coding_system *,
818 struct coding_detection_info *info);
819 static void decode_coding_utf_16 (struct coding_system *);
820 static int encode_coding_utf_16 (struct coding_system *);
821
822 static int detect_coding_iso_2022 (struct coding_system *,
823 struct coding_detection_info *info);
824 static void decode_coding_iso_2022 (struct coding_system *);
825 static int encode_coding_iso_2022 (struct coding_system *);
826
827 static int detect_coding_emacs_mule (struct coding_system *,
828 struct coding_detection_info *info);
829 static void decode_coding_emacs_mule (struct coding_system *);
830 static int encode_coding_emacs_mule (struct coding_system *);
831
832 static int detect_coding_sjis (struct coding_system *,
833 struct coding_detection_info *info);
834 static void decode_coding_sjis (struct coding_system *);
835 static int encode_coding_sjis (struct coding_system *);
836
837 static int detect_coding_big5 (struct coding_system *,
838 struct coding_detection_info *info);
839 static void decode_coding_big5 (struct coding_system *);
840 static int encode_coding_big5 (struct coding_system *);
841
842 static int detect_coding_ccl (struct coding_system *,
843 struct coding_detection_info *info);
844 static void decode_coding_ccl (struct coding_system *);
845 static int encode_coding_ccl (struct coding_system *);
846
847 static void decode_coding_raw_text (struct coding_system *);
848 static int encode_coding_raw_text (struct coding_system *);
849
850 static void coding_set_source (struct coding_system *);
851 static void coding_set_destination (struct coding_system *);
852 static void coding_alloc_by_realloc (struct coding_system *, EMACS_INT);
853 static void coding_alloc_by_making_gap (struct coding_system *,
854 EMACS_INT, EMACS_INT);
855 static unsigned char *alloc_destination (struct coding_system *,
856 EMACS_INT, unsigned char *);
857 static void setup_iso_safe_charsets (Lisp_Object);
858 static unsigned char *encode_designation_at_bol (struct coding_system *,
859 int *, unsigned char *);
860 static int detect_eol (const unsigned char *,
861 EMACS_INT, enum coding_category);
862 static Lisp_Object adjust_coding_eol_type (struct coding_system *, int);
863 static void decode_eol (struct coding_system *);
864 static Lisp_Object get_translation_table (Lisp_Object, int, int *);
865 static Lisp_Object get_translation (Lisp_Object, int *, int *);
866 static int produce_chars (struct coding_system *, Lisp_Object, int);
867 static INLINE void produce_charset (struct coding_system *, int *,
868 EMACS_INT);
869 static void produce_annotation (struct coding_system *, EMACS_INT);
870 static int decode_coding (struct coding_system *);
871 static INLINE int *handle_composition_annotation (EMACS_INT, EMACS_INT,
872 struct coding_system *,
873 int *, EMACS_INT *);
874 static INLINE int *handle_charset_annotation (EMACS_INT, EMACS_INT,
875 struct coding_system *,
876 int *, EMACS_INT *);
877 static void consume_chars (struct coding_system *, Lisp_Object, int);
878 static int encode_coding (struct coding_system *);
879 static Lisp_Object make_conversion_work_buffer (int);
880 static Lisp_Object code_conversion_restore (Lisp_Object);
881 static INLINE int char_encodable_p (int, Lisp_Object);
882 static Lisp_Object make_subsidiaries (Lisp_Object);
883
884 static void
885 record_conversion_result (struct coding_system *coding,
886 enum coding_result_code result)
887 {
888 coding->result = result;
889 switch (result)
890 {
891 case CODING_RESULT_INSUFFICIENT_SRC:
892 Vlast_code_conversion_error = Qinsufficient_source;
893 break;
894 case CODING_RESULT_INCONSISTENT_EOL:
895 Vlast_code_conversion_error = Qinconsistent_eol;
896 break;
897 case CODING_RESULT_INVALID_SRC:
898 Vlast_code_conversion_error = Qinvalid_source;
899 break;
900 case CODING_RESULT_INTERRUPT:
901 Vlast_code_conversion_error = Qinterrupted;
902 break;
903 case CODING_RESULT_INSUFFICIENT_MEM:
904 Vlast_code_conversion_error = Qinsufficient_memory;
905 break;
906 case CODING_RESULT_INSUFFICIENT_DST:
907 /* Don't record this error in Vlast_code_conversion_error
908 because it happens just temporarily and is resolved when the
909 whole conversion is finished. */
910 break;
911 case CODING_RESULT_SUCCESS:
912 break;
913 default:
914 Vlast_code_conversion_error = intern ("Unknown error");
915 }
916 }
917
918 /* This wrapper macro is used to preserve validity of pointers into
919 buffer text across calls to decode_char, which could cause
920 relocation of buffers if it loads a charset map, because loading a
921 charset map allocates large structures. */
922 #define CODING_DECODE_CHAR(coding, src, src_base, src_end, charset, code, c) \
923 do { \
924 charset_map_loaded = 0; \
925 c = DECODE_CHAR (charset, code); \
926 if (charset_map_loaded) \
927 { \
928 const unsigned char *orig = coding->source; \
929 EMACS_INT offset; \
930 \
931 coding_set_source (coding); \
932 offset = coding->source - orig; \
933 src += offset; \
934 src_base += offset; \
935 src_end += offset; \
936 } \
937 } while (0)
938
939
940 /* If there are at least BYTES length of room at dst, allocate memory
941 for coding->destination and update dst and dst_end. We don't have
942 to take care of coding->source which will be relocated. It is
943 handled by calling coding_set_source in encode_coding. */
944
945 #define ASSURE_DESTINATION(bytes) \
946 do { \
947 if (dst + (bytes) >= dst_end) \
948 { \
949 EMACS_INT more_bytes = charbuf_end - charbuf + (bytes); \
950 \
951 dst = alloc_destination (coding, more_bytes, dst); \
952 dst_end = coding->destination + coding->dst_bytes; \
953 } \
954 } while (0)
955
956
957 /* Store multibyte form of the character C in P, and advance P to the
958 end of the multibyte form. This is like CHAR_STRING_ADVANCE but it
959 never calls MAYBE_UNIFY_CHAR. */
960
961 #define CHAR_STRING_ADVANCE_NO_UNIFY(c, p) \
962 do { \
963 if ((c) <= MAX_1_BYTE_CHAR) \
964 *(p)++ = (c); \
965 else if ((c) <= MAX_2_BYTE_CHAR) \
966 *(p)++ = (0xC0 | ((c) >> 6)), \
967 *(p)++ = (0x80 | ((c) & 0x3F)); \
968 else if ((c) <= MAX_3_BYTE_CHAR) \
969 *(p)++ = (0xE0 | ((c) >> 12)), \
970 *(p)++ = (0x80 | (((c) >> 6) & 0x3F)), \
971 *(p)++ = (0x80 | ((c) & 0x3F)); \
972 else if ((c) <= MAX_4_BYTE_CHAR) \
973 *(p)++ = (0xF0 | (c >> 18)), \
974 *(p)++ = (0x80 | ((c >> 12) & 0x3F)), \
975 *(p)++ = (0x80 | ((c >> 6) & 0x3F)), \
976 *(p)++ = (0x80 | (c & 0x3F)); \
977 else if ((c) <= MAX_5_BYTE_CHAR) \
978 *(p)++ = 0xF8, \
979 *(p)++ = (0x80 | ((c >> 18) & 0x0F)), \
980 *(p)++ = (0x80 | ((c >> 12) & 0x3F)), \
981 *(p)++ = (0x80 | ((c >> 6) & 0x3F)), \
982 *(p)++ = (0x80 | (c & 0x3F)); \
983 else \
984 (p) += BYTE8_STRING ((c) - 0x3FFF80, p); \
985 } while (0)
986
987
988 /* Return the character code of character whose multibyte form is at
989 P, and advance P to the end of the multibyte form. This is like
990 STRING_CHAR_ADVANCE, but it never calls MAYBE_UNIFY_CHAR. */
991
992 #define STRING_CHAR_ADVANCE_NO_UNIFY(p) \
993 (!((p)[0] & 0x80) \
994 ? *(p)++ \
995 : ! ((p)[0] & 0x20) \
996 ? ((p) += 2, \
997 ((((p)[-2] & 0x1F) << 6) \
998 | ((p)[-1] & 0x3F) \
999 | ((unsigned char) ((p)[-2]) < 0xC2 ? 0x3FFF80 : 0))) \
1000 : ! ((p)[0] & 0x10) \
1001 ? ((p) += 3, \
1002 ((((p)[-3] & 0x0F) << 12) \
1003 | (((p)[-2] & 0x3F) << 6) \
1004 | ((p)[-1] & 0x3F))) \
1005 : ! ((p)[0] & 0x08) \
1006 ? ((p) += 4, \
1007 ((((p)[-4] & 0xF) << 18) \
1008 | (((p)[-3] & 0x3F) << 12) \
1009 | (((p)[-2] & 0x3F) << 6) \
1010 | ((p)[-1] & 0x3F))) \
1011 : ((p) += 5, \
1012 ((((p)[-4] & 0x3F) << 18) \
1013 | (((p)[-3] & 0x3F) << 12) \
1014 | (((p)[-2] & 0x3F) << 6) \
1015 | ((p)[-1] & 0x3F))))
1016
1017
1018 static void
1019 coding_set_source (struct coding_system *coding)
1020 {
1021 if (BUFFERP (coding->src_object))
1022 {
1023 struct buffer *buf = XBUFFER (coding->src_object);
1024
1025 if (coding->src_pos < 0)
1026 coding->source = BUF_GAP_END_ADDR (buf) + coding->src_pos_byte;
1027 else
1028 coding->source = BUF_BYTE_ADDRESS (buf, coding->src_pos_byte);
1029 }
1030 else if (STRINGP (coding->src_object))
1031 {
1032 coding->source = SDATA (coding->src_object) + coding->src_pos_byte;
1033 }
1034 else
1035 {
1036 /* Otherwise, the source is C string and is never relocated
1037 automatically. Thus we don't have to update anything. */
1038 }
1039 }
1040
1041 static void
1042 coding_set_destination (struct coding_system *coding)
1043 {
1044 if (BUFFERP (coding->dst_object))
1045 {
1046 if (coding->src_pos < 0)
1047 {
1048 coding->destination = BEG_ADDR + coding->dst_pos_byte - BEG_BYTE;
1049 coding->dst_bytes = (GAP_END_ADDR
1050 - (coding->src_bytes - coding->consumed)
1051 - coding->destination);
1052 }
1053 else
1054 {
1055 /* We are sure that coding->dst_pos_byte is before the gap
1056 of the buffer. */
1057 coding->destination = (BUF_BEG_ADDR (XBUFFER (coding->dst_object))
1058 + coding->dst_pos_byte - BEG_BYTE);
1059 coding->dst_bytes = (BUF_GAP_END_ADDR (XBUFFER (coding->dst_object))
1060 - coding->destination);
1061 }
1062 }
1063 else
1064 {
1065 /* Otherwise, the destination is C string and is never relocated
1066 automatically. Thus we don't have to update anything. */
1067 }
1068 }
1069
1070
1071 static void
1072 coding_alloc_by_realloc (struct coding_system *coding, EMACS_INT bytes)
1073 {
1074 if (coding->dst_bytes >= MOST_POSITIVE_FIXNUM - bytes)
1075 error ("Maximum size of buffer or string exceeded");
1076 coding->destination = (unsigned char *) xrealloc (coding->destination,
1077 coding->dst_bytes + bytes);
1078 coding->dst_bytes += bytes;
1079 }
1080
1081 static void
1082 coding_alloc_by_making_gap (struct coding_system *coding,
1083 EMACS_INT gap_head_used, EMACS_INT bytes)
1084 {
1085 if (EQ (coding->src_object, coding->dst_object))
1086 {
1087 /* The gap may contain the produced data at the head and not-yet
1088 consumed data at the tail. To preserve those data, we at
1089 first make the gap size to zero, then increase the gap
1090 size. */
1091 EMACS_INT add = GAP_SIZE;
1092
1093 GPT += gap_head_used, GPT_BYTE += gap_head_used;
1094 GAP_SIZE = 0; ZV += add; Z += add; ZV_BYTE += add; Z_BYTE += add;
1095 make_gap (bytes);
1096 GAP_SIZE += add; ZV -= add; Z -= add; ZV_BYTE -= add; Z_BYTE -= add;
1097 GPT -= gap_head_used, GPT_BYTE -= gap_head_used;
1098 }
1099 else
1100 {
1101 Lisp_Object this_buffer;
1102
1103 this_buffer = Fcurrent_buffer ();
1104 set_buffer_internal (XBUFFER (coding->dst_object));
1105 make_gap (bytes);
1106 set_buffer_internal (XBUFFER (this_buffer));
1107 }
1108 }
1109
1110
1111 static unsigned char *
1112 alloc_destination (struct coding_system *coding, EMACS_INT nbytes,
1113 unsigned char *dst)
1114 {
1115 EMACS_INT offset = dst - coding->destination;
1116
1117 if (BUFFERP (coding->dst_object))
1118 {
1119 struct buffer *buf = XBUFFER (coding->dst_object);
1120
1121 coding_alloc_by_making_gap (coding, dst - BUF_GPT_ADDR (buf), nbytes);
1122 }
1123 else
1124 coding_alloc_by_realloc (coding, nbytes);
1125 coding_set_destination (coding);
1126 dst = coding->destination + offset;
1127 return dst;
1128 }
1129
1130 /** Macros for annotations. */
1131
1132 /* An annotation data is stored in the array coding->charbuf in this
1133 format:
1134 [ -LENGTH ANNOTATION_MASK NCHARS ... ]
1135 LENGTH is the number of elements in the annotation.
1136 ANNOTATION_MASK is one of CODING_ANNOTATE_XXX_MASK.
1137 NCHARS is the number of characters in the text annotated.
1138
1139 The format of the following elements depend on ANNOTATION_MASK.
1140
1141 In the case of CODING_ANNOTATE_COMPOSITION_MASK, these elements
1142 follows:
1143 ... NBYTES METHOD [ COMPOSITION-COMPONENTS ... ]
1144
1145 NBYTES is the number of bytes specified in the header part of
1146 old-style emacs-mule encoding, or 0 for the other kind of
1147 composition.
1148
1149 METHOD is one of enum composition_method.
1150
1151 Optional COMPOSITION-COMPONENTS are characters and composition
1152 rules.
1153
1154 In the case of CODING_ANNOTATE_CHARSET_MASK, one element CHARSET-ID
1155 follows.
1156
1157 If ANNOTATION_MASK is 0, this annotation is just a space holder to
1158 recover from an invalid annotation, and should be skipped by
1159 produce_annotation. */
1160
1161 /* Maximum length of the header of annotation data. */
1162 #define MAX_ANNOTATION_LENGTH 5
1163
1164 #define ADD_ANNOTATION_DATA(buf, len, mask, nchars) \
1165 do { \
1166 *(buf)++ = -(len); \
1167 *(buf)++ = (mask); \
1168 *(buf)++ = (nchars); \
1169 coding->annotated = 1; \
1170 } while (0);
1171
1172 #define ADD_COMPOSITION_DATA(buf, nchars, nbytes, method) \
1173 do { \
1174 ADD_ANNOTATION_DATA (buf, 5, CODING_ANNOTATE_COMPOSITION_MASK, nchars); \
1175 *buf++ = nbytes; \
1176 *buf++ = method; \
1177 } while (0)
1178
1179
1180 #define ADD_CHARSET_DATA(buf, nchars, id) \
1181 do { \
1182 ADD_ANNOTATION_DATA (buf, 4, CODING_ANNOTATE_CHARSET_MASK, nchars); \
1183 *buf++ = id; \
1184 } while (0)
1185
1186 \f
1187 /*** 2. Emacs' internal format (emacs-utf-8) ***/
1188
1189
1190
1191 \f
1192 /*** 3. UTF-8 ***/
1193
1194 /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
1195 Check if a text is encoded in UTF-8. If it is, return 1, else
1196 return 0. */
1197
1198 #define UTF_8_1_OCTET_P(c) ((c) < 0x80)
1199 #define UTF_8_EXTRA_OCTET_P(c) (((c) & 0xC0) == 0x80)
1200 #define UTF_8_2_OCTET_LEADING_P(c) (((c) & 0xE0) == 0xC0)
1201 #define UTF_8_3_OCTET_LEADING_P(c) (((c) & 0xF0) == 0xE0)
1202 #define UTF_8_4_OCTET_LEADING_P(c) (((c) & 0xF8) == 0xF0)
1203 #define UTF_8_5_OCTET_LEADING_P(c) (((c) & 0xFC) == 0xF8)
1204
1205 #define UTF_8_BOM_1 0xEF
1206 #define UTF_8_BOM_2 0xBB
1207 #define UTF_8_BOM_3 0xBF
1208
1209 static int
1210 detect_coding_utf_8 (struct coding_system *coding,
1211 struct coding_detection_info *detect_info)
1212 {
1213 const unsigned char *src = coding->source, *src_base;
1214 const unsigned char *src_end = coding->source + coding->src_bytes;
1215 int multibytep = coding->src_multibyte;
1216 EMACS_INT consumed_chars = 0;
1217 int bom_found = 0;
1218 int found = 0;
1219
1220 detect_info->checked |= CATEGORY_MASK_UTF_8;
1221 /* A coding system of this category is always ASCII compatible. */
1222 src += coding->head_ascii;
1223
1224 while (1)
1225 {
1226 int c, c1, c2, c3, c4;
1227
1228 src_base = src;
1229 ONE_MORE_BYTE (c);
1230 if (c < 0 || UTF_8_1_OCTET_P (c))
1231 continue;
1232 ONE_MORE_BYTE (c1);
1233 if (c1 < 0 || ! UTF_8_EXTRA_OCTET_P (c1))
1234 break;
1235 if (UTF_8_2_OCTET_LEADING_P (c))
1236 {
1237 found = 1;
1238 continue;
1239 }
1240 ONE_MORE_BYTE (c2);
1241 if (c2 < 0 || ! UTF_8_EXTRA_OCTET_P (c2))
1242 break;
1243 if (UTF_8_3_OCTET_LEADING_P (c))
1244 {
1245 found = 1;
1246 if (src_base == coding->source
1247 && c == UTF_8_BOM_1 && c1 == UTF_8_BOM_2 && c2 == UTF_8_BOM_3)
1248 bom_found = 1;
1249 continue;
1250 }
1251 ONE_MORE_BYTE (c3);
1252 if (c3 < 0 || ! UTF_8_EXTRA_OCTET_P (c3))
1253 break;
1254 if (UTF_8_4_OCTET_LEADING_P (c))
1255 {
1256 found = 1;
1257 continue;
1258 }
1259 ONE_MORE_BYTE (c4);
1260 if (c4 < 0 || ! UTF_8_EXTRA_OCTET_P (c4))
1261 break;
1262 if (UTF_8_5_OCTET_LEADING_P (c))
1263 {
1264 found = 1;
1265 continue;
1266 }
1267 break;
1268 }
1269 detect_info->rejected |= CATEGORY_MASK_UTF_8;
1270 return 0;
1271
1272 no_more_source:
1273 if (src_base < src && coding->mode & CODING_MODE_LAST_BLOCK)
1274 {
1275 detect_info->rejected |= CATEGORY_MASK_UTF_8;
1276 return 0;
1277 }
1278 if (bom_found)
1279 {
1280 /* The first character 0xFFFE doesn't necessarily mean a BOM. */
1281 detect_info->found |= CATEGORY_MASK_UTF_8_SIG | CATEGORY_MASK_UTF_8_NOSIG;
1282 }
1283 else
1284 {
1285 detect_info->rejected |= CATEGORY_MASK_UTF_8_SIG;
1286 if (found)
1287 detect_info->found |= CATEGORY_MASK_UTF_8_NOSIG;
1288 }
1289 return 1;
1290 }
1291
1292
1293 static void
1294 decode_coding_utf_8 (struct coding_system *coding)
1295 {
1296 const unsigned char *src = coding->source + coding->consumed;
1297 const unsigned char *src_end = coding->source + coding->src_bytes;
1298 const unsigned char *src_base;
1299 int *charbuf = coding->charbuf + coding->charbuf_used;
1300 int *charbuf_end = coding->charbuf + coding->charbuf_size;
1301 EMACS_INT consumed_chars = 0, consumed_chars_base = 0;
1302 int multibytep = coding->src_multibyte;
1303 enum utf_bom_type bom = CODING_UTF_8_BOM (coding);
1304 int eol_dos =
1305 !inhibit_eol_conversion && EQ (CODING_ID_EOL_TYPE (coding->id), Qdos);
1306 int byte_after_cr = -1;
1307
1308 if (bom != utf_without_bom)
1309 {
1310 int c1, c2, c3;
1311
1312 src_base = src;
1313 ONE_MORE_BYTE (c1);
1314 if (! UTF_8_3_OCTET_LEADING_P (c1))
1315 src = src_base;
1316 else
1317 {
1318 ONE_MORE_BYTE (c2);
1319 if (! UTF_8_EXTRA_OCTET_P (c2))
1320 src = src_base;
1321 else
1322 {
1323 ONE_MORE_BYTE (c3);
1324 if (! UTF_8_EXTRA_OCTET_P (c3))
1325 src = src_base;
1326 else
1327 {
1328 if ((c1 != UTF_8_BOM_1)
1329 || (c2 != UTF_8_BOM_2) || (c3 != UTF_8_BOM_3))
1330 src = src_base;
1331 else
1332 CODING_UTF_8_BOM (coding) = utf_without_bom;
1333 }
1334 }
1335 }
1336 }
1337 CODING_UTF_8_BOM (coding) = utf_without_bom;
1338
1339 while (1)
1340 {
1341 int c, c1, c2, c3, c4, c5;
1342
1343 src_base = src;
1344 consumed_chars_base = consumed_chars;
1345
1346 if (charbuf >= charbuf_end)
1347 {
1348 if (byte_after_cr >= 0)
1349 src_base--;
1350 break;
1351 }
1352
1353 if (byte_after_cr >= 0)
1354 c1 = byte_after_cr, byte_after_cr = -1;
1355 else
1356 ONE_MORE_BYTE (c1);
1357 if (c1 < 0)
1358 {
1359 c = - c1;
1360 }
1361 else if (UTF_8_1_OCTET_P (c1))
1362 {
1363 if (eol_dos && c1 == '\r')
1364 ONE_MORE_BYTE (byte_after_cr);
1365 c = c1;
1366 }
1367 else
1368 {
1369 ONE_MORE_BYTE (c2);
1370 if (c2 < 0 || ! UTF_8_EXTRA_OCTET_P (c2))
1371 goto invalid_code;
1372 if (UTF_8_2_OCTET_LEADING_P (c1))
1373 {
1374 c = ((c1 & 0x1F) << 6) | (c2 & 0x3F);
1375 /* Reject overlong sequences here and below. Encoders
1376 producing them are incorrect, they can be misleading,
1377 and they mess up read/write invariance. */
1378 if (c < 128)
1379 goto invalid_code;
1380 }
1381 else
1382 {
1383 ONE_MORE_BYTE (c3);
1384 if (c3 < 0 || ! UTF_8_EXTRA_OCTET_P (c3))
1385 goto invalid_code;
1386 if (UTF_8_3_OCTET_LEADING_P (c1))
1387 {
1388 c = (((c1 & 0xF) << 12)
1389 | ((c2 & 0x3F) << 6) | (c3 & 0x3F));
1390 if (c < 0x800
1391 || (c >= 0xd800 && c < 0xe000)) /* surrogates (invalid) */
1392 goto invalid_code;
1393 }
1394 else
1395 {
1396 ONE_MORE_BYTE (c4);
1397 if (c4 < 0 || ! UTF_8_EXTRA_OCTET_P (c4))
1398 goto invalid_code;
1399 if (UTF_8_4_OCTET_LEADING_P (c1))
1400 {
1401 c = (((c1 & 0x7) << 18) | ((c2 & 0x3F) << 12)
1402 | ((c3 & 0x3F) << 6) | (c4 & 0x3F));
1403 if (c < 0x10000)
1404 goto invalid_code;
1405 }
1406 else
1407 {
1408 ONE_MORE_BYTE (c5);
1409 if (c5 < 0 || ! UTF_8_EXTRA_OCTET_P (c5))
1410 goto invalid_code;
1411 if (UTF_8_5_OCTET_LEADING_P (c1))
1412 {
1413 c = (((c1 & 0x3) << 24) | ((c2 & 0x3F) << 18)
1414 | ((c3 & 0x3F) << 12) | ((c4 & 0x3F) << 6)
1415 | (c5 & 0x3F));
1416 if ((c > MAX_CHAR) || (c < 0x200000))
1417 goto invalid_code;
1418 }
1419 else
1420 goto invalid_code;
1421 }
1422 }
1423 }
1424 }
1425
1426 *charbuf++ = c;
1427 continue;
1428
1429 invalid_code:
1430 src = src_base;
1431 consumed_chars = consumed_chars_base;
1432 ONE_MORE_BYTE (c);
1433 *charbuf++ = ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c);
1434 coding->errors++;
1435 }
1436
1437 no_more_source:
1438 coding->consumed_char += consumed_chars_base;
1439 coding->consumed = src_base - coding->source;
1440 coding->charbuf_used = charbuf - coding->charbuf;
1441 }
1442
1443
1444 static int
1445 encode_coding_utf_8 (struct coding_system *coding)
1446 {
1447 int multibytep = coding->dst_multibyte;
1448 int *charbuf = coding->charbuf;
1449 int *charbuf_end = charbuf + coding->charbuf_used;
1450 unsigned char *dst = coding->destination + coding->produced;
1451 unsigned char *dst_end = coding->destination + coding->dst_bytes;
1452 EMACS_INT produced_chars = 0;
1453 int c;
1454
1455 if (CODING_UTF_8_BOM (coding) == utf_with_bom)
1456 {
1457 ASSURE_DESTINATION (3);
1458 EMIT_THREE_BYTES (UTF_8_BOM_1, UTF_8_BOM_2, UTF_8_BOM_3);
1459 CODING_UTF_8_BOM (coding) = utf_without_bom;
1460 }
1461
1462 if (multibytep)
1463 {
1464 int safe_room = MAX_MULTIBYTE_LENGTH * 2;
1465
1466 while (charbuf < charbuf_end)
1467 {
1468 unsigned char str[MAX_MULTIBYTE_LENGTH], *p, *pend = str;
1469
1470 ASSURE_DESTINATION (safe_room);
1471 c = *charbuf++;
1472 if (CHAR_BYTE8_P (c))
1473 {
1474 c = CHAR_TO_BYTE8 (c);
1475 EMIT_ONE_BYTE (c);
1476 }
1477 else
1478 {
1479 CHAR_STRING_ADVANCE_NO_UNIFY (c, pend);
1480 for (p = str; p < pend; p++)
1481 EMIT_ONE_BYTE (*p);
1482 }
1483 }
1484 }
1485 else
1486 {
1487 int safe_room = MAX_MULTIBYTE_LENGTH;
1488
1489 while (charbuf < charbuf_end)
1490 {
1491 ASSURE_DESTINATION (safe_room);
1492 c = *charbuf++;
1493 if (CHAR_BYTE8_P (c))
1494 *dst++ = CHAR_TO_BYTE8 (c);
1495 else
1496 CHAR_STRING_ADVANCE_NO_UNIFY (c, dst);
1497 produced_chars++;
1498 }
1499 }
1500 record_conversion_result (coding, CODING_RESULT_SUCCESS);
1501 coding->produced_char += produced_chars;
1502 coding->produced = dst - coding->destination;
1503 return 0;
1504 }
1505
1506
1507 /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
1508 Check if a text is encoded in one of UTF-16 based coding systems.
1509 If it is, return 1, else return 0. */
1510
1511 #define UTF_16_HIGH_SURROGATE_P(val) \
1512 (((val) & 0xFC00) == 0xD800)
1513
1514 #define UTF_16_LOW_SURROGATE_P(val) \
1515 (((val) & 0xFC00) == 0xDC00)
1516
1517
1518 static int
1519 detect_coding_utf_16 (struct coding_system *coding,
1520 struct coding_detection_info *detect_info)
1521 {
1522 const unsigned char *src = coding->source;
1523 const unsigned char *src_end = coding->source + coding->src_bytes;
1524 int multibytep = coding->src_multibyte;
1525 int c1, c2;
1526
1527 detect_info->checked |= CATEGORY_MASK_UTF_16;
1528 if (coding->mode & CODING_MODE_LAST_BLOCK
1529 && (coding->src_chars & 1))
1530 {
1531 detect_info->rejected |= CATEGORY_MASK_UTF_16;
1532 return 0;
1533 }
1534
1535 TWO_MORE_BYTES (c1, c2);
1536 if ((c1 == 0xFF) && (c2 == 0xFE))
1537 {
1538 detect_info->found |= (CATEGORY_MASK_UTF_16_LE
1539 | CATEGORY_MASK_UTF_16_AUTO);
1540 detect_info->rejected |= (CATEGORY_MASK_UTF_16_BE
1541 | CATEGORY_MASK_UTF_16_BE_NOSIG
1542 | CATEGORY_MASK_UTF_16_LE_NOSIG);
1543 }
1544 else if ((c1 == 0xFE) && (c2 == 0xFF))
1545 {
1546 detect_info->found |= (CATEGORY_MASK_UTF_16_BE
1547 | CATEGORY_MASK_UTF_16_AUTO);
1548 detect_info->rejected |= (CATEGORY_MASK_UTF_16_LE
1549 | CATEGORY_MASK_UTF_16_BE_NOSIG
1550 | CATEGORY_MASK_UTF_16_LE_NOSIG);
1551 }
1552 else if (c2 < 0)
1553 {
1554 detect_info->rejected |= CATEGORY_MASK_UTF_16;
1555 return 0;
1556 }
1557 else
1558 {
1559 /* We check the dispersion of Eth and Oth bytes where E is even and
1560 O is odd. If both are high, we assume binary data.*/
1561 unsigned char e[256], o[256];
1562 unsigned e_num = 1, o_num = 1;
1563
1564 memset (e, 0, 256);
1565 memset (o, 0, 256);
1566 e[c1] = 1;
1567 o[c2] = 1;
1568
1569 detect_info->rejected |= (CATEGORY_MASK_UTF_16_AUTO
1570 |CATEGORY_MASK_UTF_16_BE
1571 | CATEGORY_MASK_UTF_16_LE);
1572
1573 while ((detect_info->rejected & CATEGORY_MASK_UTF_16)
1574 != CATEGORY_MASK_UTF_16)
1575 {
1576 TWO_MORE_BYTES (c1, c2);
1577 if (c2 < 0)
1578 break;
1579 if (! e[c1])
1580 {
1581 e[c1] = 1;
1582 e_num++;
1583 if (e_num >= 128)
1584 detect_info->rejected |= CATEGORY_MASK_UTF_16_BE_NOSIG;
1585 }
1586 if (! o[c2])
1587 {
1588 o[c2] = 1;
1589 o_num++;
1590 if (o_num >= 128)
1591 detect_info->rejected |= CATEGORY_MASK_UTF_16_LE_NOSIG;
1592 }
1593 }
1594 return 0;
1595 }
1596
1597 no_more_source:
1598 return 1;
1599 }
1600
1601 static void
1602 decode_coding_utf_16 (struct coding_system *coding)
1603 {
1604 const unsigned char *src = coding->source + coding->consumed;
1605 const unsigned char *src_end = coding->source + coding->src_bytes;
1606 const unsigned char *src_base;
1607 int *charbuf = coding->charbuf + coding->charbuf_used;
1608 /* We may produces at most 3 chars in one loop. */
1609 int *charbuf_end = coding->charbuf + coding->charbuf_size - 2;
1610 EMACS_INT consumed_chars = 0, consumed_chars_base = 0;
1611 int multibytep = coding->src_multibyte;
1612 enum utf_bom_type bom = CODING_UTF_16_BOM (coding);
1613 enum utf_16_endian_type endian = CODING_UTF_16_ENDIAN (coding);
1614 int surrogate = CODING_UTF_16_SURROGATE (coding);
1615 int eol_dos =
1616 !inhibit_eol_conversion && EQ (CODING_ID_EOL_TYPE (coding->id), Qdos);
1617 int byte_after_cr1 = -1, byte_after_cr2 = -1;
1618
1619 if (bom == utf_with_bom)
1620 {
1621 int c, c1, c2;
1622
1623 src_base = src;
1624 ONE_MORE_BYTE (c1);
1625 ONE_MORE_BYTE (c2);
1626 c = (c1 << 8) | c2;
1627
1628 if (endian == utf_16_big_endian
1629 ? c != 0xFEFF : c != 0xFFFE)
1630 {
1631 /* The first two bytes are not BOM. Treat them as bytes
1632 for a normal character. */
1633 src = src_base;
1634 coding->errors++;
1635 }
1636 CODING_UTF_16_BOM (coding) = utf_without_bom;
1637 }
1638 else if (bom == utf_detect_bom)
1639 {
1640 /* We have already tried to detect BOM and failed in
1641 detect_coding. */
1642 CODING_UTF_16_BOM (coding) = utf_without_bom;
1643 }
1644
1645 while (1)
1646 {
1647 int c, c1, c2;
1648
1649 src_base = src;
1650 consumed_chars_base = consumed_chars;
1651
1652 if (charbuf >= charbuf_end)
1653 {
1654 if (byte_after_cr1 >= 0)
1655 src_base -= 2;
1656 break;
1657 }
1658
1659 if (byte_after_cr1 >= 0)
1660 c1 = byte_after_cr1, byte_after_cr1 = -1;
1661 else
1662 ONE_MORE_BYTE (c1);
1663 if (c1 < 0)
1664 {
1665 *charbuf++ = -c1;
1666 continue;
1667 }
1668 if (byte_after_cr2 >= 0)
1669 c2 = byte_after_cr2, byte_after_cr2 = -1;
1670 else
1671 ONE_MORE_BYTE (c2);
1672 if (c2 < 0)
1673 {
1674 *charbuf++ = ASCII_BYTE_P (c1) ? c1 : BYTE8_TO_CHAR (c1);
1675 *charbuf++ = -c2;
1676 continue;
1677 }
1678 c = (endian == utf_16_big_endian
1679 ? ((c1 << 8) | c2) : ((c2 << 8) | c1));
1680
1681 if (surrogate)
1682 {
1683 if (! UTF_16_LOW_SURROGATE_P (c))
1684 {
1685 if (endian == utf_16_big_endian)
1686 c1 = surrogate >> 8, c2 = surrogate & 0xFF;
1687 else
1688 c1 = surrogate & 0xFF, c2 = surrogate >> 8;
1689 *charbuf++ = c1;
1690 *charbuf++ = c2;
1691 coding->errors++;
1692 if (UTF_16_HIGH_SURROGATE_P (c))
1693 CODING_UTF_16_SURROGATE (coding) = surrogate = c;
1694 else
1695 *charbuf++ = c;
1696 }
1697 else
1698 {
1699 c = ((surrogate - 0xD800) << 10) | (c - 0xDC00);
1700 CODING_UTF_16_SURROGATE (coding) = surrogate = 0;
1701 *charbuf++ = 0x10000 + c;
1702 }
1703 }
1704 else
1705 {
1706 if (UTF_16_HIGH_SURROGATE_P (c))
1707 CODING_UTF_16_SURROGATE (coding) = surrogate = c;
1708 else
1709 {
1710 if (eol_dos && c == '\r')
1711 {
1712 ONE_MORE_BYTE (byte_after_cr1);
1713 ONE_MORE_BYTE (byte_after_cr2);
1714 }
1715 *charbuf++ = c;
1716 }
1717 }
1718 }
1719
1720 no_more_source:
1721 coding->consumed_char += consumed_chars_base;
1722 coding->consumed = src_base - coding->source;
1723 coding->charbuf_used = charbuf - coding->charbuf;
1724 }
1725
1726 static int
1727 encode_coding_utf_16 (struct coding_system *coding)
1728 {
1729 int multibytep = coding->dst_multibyte;
1730 int *charbuf = coding->charbuf;
1731 int *charbuf_end = charbuf + coding->charbuf_used;
1732 unsigned char *dst = coding->destination + coding->produced;
1733 unsigned char *dst_end = coding->destination + coding->dst_bytes;
1734 int safe_room = 8;
1735 enum utf_bom_type bom = CODING_UTF_16_BOM (coding);
1736 int big_endian = CODING_UTF_16_ENDIAN (coding) == utf_16_big_endian;
1737 EMACS_INT produced_chars = 0;
1738 int c;
1739
1740 if (bom != utf_without_bom)
1741 {
1742 ASSURE_DESTINATION (safe_room);
1743 if (big_endian)
1744 EMIT_TWO_BYTES (0xFE, 0xFF);
1745 else
1746 EMIT_TWO_BYTES (0xFF, 0xFE);
1747 CODING_UTF_16_BOM (coding) = utf_without_bom;
1748 }
1749
1750 while (charbuf < charbuf_end)
1751 {
1752 ASSURE_DESTINATION (safe_room);
1753 c = *charbuf++;
1754 if (c > MAX_UNICODE_CHAR)
1755 c = coding->default_char;
1756
1757 if (c < 0x10000)
1758 {
1759 if (big_endian)
1760 EMIT_TWO_BYTES (c >> 8, c & 0xFF);
1761 else
1762 EMIT_TWO_BYTES (c & 0xFF, c >> 8);
1763 }
1764 else
1765 {
1766 int c1, c2;
1767
1768 c -= 0x10000;
1769 c1 = (c >> 10) + 0xD800;
1770 c2 = (c & 0x3FF) + 0xDC00;
1771 if (big_endian)
1772 EMIT_FOUR_BYTES (c1 >> 8, c1 & 0xFF, c2 >> 8, c2 & 0xFF);
1773 else
1774 EMIT_FOUR_BYTES (c1 & 0xFF, c1 >> 8, c2 & 0xFF, c2 >> 8);
1775 }
1776 }
1777 record_conversion_result (coding, CODING_RESULT_SUCCESS);
1778 coding->produced = dst - coding->destination;
1779 coding->produced_char += produced_chars;
1780 return 0;
1781 }
1782
1783 \f
1784 /*** 6. Old Emacs' internal format (emacs-mule) ***/
1785
1786 /* Emacs' internal format for representation of multiple character
1787 sets is a kind of multi-byte encoding, i.e. characters are
1788 represented by variable-length sequences of one-byte codes.
1789
1790 ASCII characters and control characters (e.g. `tab', `newline') are
1791 represented by one-byte sequences which are their ASCII codes, in
1792 the range 0x00 through 0x7F.
1793
1794 8-bit characters of the range 0x80..0x9F are represented by
1795 two-byte sequences of LEADING_CODE_8_BIT_CONTROL and (their 8-bit
1796 code + 0x20).
1797
1798 8-bit characters of the range 0xA0..0xFF are represented by
1799 one-byte sequences which are their 8-bit code.
1800
1801 The other characters are represented by a sequence of `base
1802 leading-code', optional `extended leading-code', and one or two
1803 `position-code's. The length of the sequence is determined by the
1804 base leading-code. Leading-code takes the range 0x81 through 0x9D,
1805 whereas extended leading-code and position-code take the range 0xA0
1806 through 0xFF. See `charset.h' for more details about leading-code
1807 and position-code.
1808
1809 --- CODE RANGE of Emacs' internal format ---
1810 character set range
1811 ------------- -----
1812 ascii 0x00..0x7F
1813 eight-bit-control LEADING_CODE_8_BIT_CONTROL + 0xA0..0xBF
1814 eight-bit-graphic 0xA0..0xBF
1815 ELSE 0x81..0x9D + [0xA0..0xFF]+
1816 ---------------------------------------------
1817
1818 As this is the internal character representation, the format is
1819 usually not used externally (i.e. in a file or in a data sent to a
1820 process). But, it is possible to have a text externally in this
1821 format (i.e. by encoding by the coding system `emacs-mule').
1822
1823 In that case, a sequence of one-byte codes has a slightly different
1824 form.
1825
1826 At first, all characters in eight-bit-control are represented by
1827 one-byte sequences which are their 8-bit code.
1828
1829 Next, character composition data are represented by the byte
1830 sequence of the form: 0x80 METHOD BYTES CHARS COMPONENT ...,
1831 where,
1832 METHOD is 0xF2 plus one of composition method (enum
1833 composition_method),
1834
1835 BYTES is 0xA0 plus a byte length of this composition data,
1836
1837 CHARS is 0xA0 plus a number of characters composed by this
1838 data,
1839
1840 COMPONENTs are characters of multibyte form or composition
1841 rules encoded by two-byte of ASCII codes.
1842
1843 In addition, for backward compatibility, the following formats are
1844 also recognized as composition data on decoding.
1845
1846 0x80 MSEQ ...
1847 0x80 0xFF MSEQ RULE MSEQ RULE ... MSEQ
1848
1849 Here,
1850 MSEQ is a multibyte form but in these special format:
1851 ASCII: 0xA0 ASCII_CODE+0x80,
1852 other: LEADING_CODE+0x20 FOLLOWING-BYTE ...,
1853 RULE is a one byte code of the range 0xA0..0xF0 that
1854 represents a composition rule.
1855 */
1856
1857 char emacs_mule_bytes[256];
1858
1859
1860 /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
1861 Check if a text is encoded in `emacs-mule'. If it is, return 1,
1862 else return 0. */
1863
1864 static int
1865 detect_coding_emacs_mule (struct coding_system *coding,
1866 struct coding_detection_info *detect_info)
1867 {
1868 const unsigned char *src = coding->source, *src_base;
1869 const unsigned char *src_end = coding->source + coding->src_bytes;
1870 int multibytep = coding->src_multibyte;
1871 EMACS_INT consumed_chars = 0;
1872 int c;
1873 int found = 0;
1874
1875 detect_info->checked |= CATEGORY_MASK_EMACS_MULE;
1876 /* A coding system of this category is always ASCII compatible. */
1877 src += coding->head_ascii;
1878
1879 while (1)
1880 {
1881 src_base = src;
1882 ONE_MORE_BYTE (c);
1883 if (c < 0)
1884 continue;
1885 if (c == 0x80)
1886 {
1887 /* Perhaps the start of composite character. We simply skip
1888 it because analyzing it is too heavy for detecting. But,
1889 at least, we check that the composite character
1890 constitutes of more than 4 bytes. */
1891 const unsigned char *src_start;
1892
1893 repeat:
1894 src_start = src;
1895 do
1896 {
1897 ONE_MORE_BYTE (c);
1898 }
1899 while (c >= 0xA0);
1900
1901 if (src - src_start <= 4)
1902 break;
1903 found = CATEGORY_MASK_EMACS_MULE;
1904 if (c == 0x80)
1905 goto repeat;
1906 }
1907
1908 if (c < 0x80)
1909 {
1910 if (c < 0x20
1911 && (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO))
1912 break;
1913 }
1914 else
1915 {
1916 int more_bytes = emacs_mule_bytes[c] - 1;
1917
1918 while (more_bytes > 0)
1919 {
1920 ONE_MORE_BYTE (c);
1921 if (c < 0xA0)
1922 {
1923 src--; /* Unread the last byte. */
1924 break;
1925 }
1926 more_bytes--;
1927 }
1928 if (more_bytes != 0)
1929 break;
1930 found = CATEGORY_MASK_EMACS_MULE;
1931 }
1932 }
1933 detect_info->rejected |= CATEGORY_MASK_EMACS_MULE;
1934 return 0;
1935
1936 no_more_source:
1937 if (src_base < src && coding->mode & CODING_MODE_LAST_BLOCK)
1938 {
1939 detect_info->rejected |= CATEGORY_MASK_EMACS_MULE;
1940 return 0;
1941 }
1942 detect_info->found |= found;
1943 return 1;
1944 }
1945
1946
1947 /* Parse emacs-mule multibyte sequence at SRC and return the decoded
1948 character. If CMP_STATUS indicates that we must expect MSEQ or
1949 RULE described above, decode it and return the negative value of
1950 the decoded character or rule. If an invalid byte is found, return
1951 -1. If SRC is too short, return -2. */
1952
1953 static int
1954 emacs_mule_char (struct coding_system *coding, const unsigned char *src,
1955 int *nbytes, int *nchars, int *id,
1956 struct composition_status *cmp_status)
1957 {
1958 const unsigned char *src_end = coding->source + coding->src_bytes;
1959 const unsigned char *src_base = src;
1960 int multibytep = coding->src_multibyte;
1961 int charset_ID;
1962 unsigned code;
1963 int c;
1964 int consumed_chars = 0;
1965 int mseq_found = 0;
1966
1967 ONE_MORE_BYTE (c);
1968 if (c < 0)
1969 {
1970 c = -c;
1971 charset_ID = emacs_mule_charset[0];
1972 }
1973 else
1974 {
1975 if (c >= 0xA0)
1976 {
1977 if (cmp_status->state != COMPOSING_NO
1978 && cmp_status->old_form)
1979 {
1980 if (cmp_status->state == COMPOSING_CHAR)
1981 {
1982 if (c == 0xA0)
1983 {
1984 ONE_MORE_BYTE (c);
1985 c -= 0x80;
1986 if (c < 0)
1987 goto invalid_code;
1988 }
1989 else
1990 c -= 0x20;
1991 mseq_found = 1;
1992 }
1993 else
1994 {
1995 *nbytes = src - src_base;
1996 *nchars = consumed_chars;
1997 return -c;
1998 }
1999 }
2000 else
2001 goto invalid_code;
2002 }
2003
2004 switch (emacs_mule_bytes[c])
2005 {
2006 case 2:
2007 if ((charset_ID = emacs_mule_charset[c]) < 0)
2008 goto invalid_code;
2009 ONE_MORE_BYTE (c);
2010 if (c < 0xA0)
2011 goto invalid_code;
2012 code = c & 0x7F;
2013 break;
2014
2015 case 3:
2016 if (c == EMACS_MULE_LEADING_CODE_PRIVATE_11
2017 || c == EMACS_MULE_LEADING_CODE_PRIVATE_12)
2018 {
2019 ONE_MORE_BYTE (c);
2020 if (c < 0xA0 || (charset_ID = emacs_mule_charset[c]) < 0)
2021 goto invalid_code;
2022 ONE_MORE_BYTE (c);
2023 if (c < 0xA0)
2024 goto invalid_code;
2025 code = c & 0x7F;
2026 }
2027 else
2028 {
2029 if ((charset_ID = emacs_mule_charset[c]) < 0)
2030 goto invalid_code;
2031 ONE_MORE_BYTE (c);
2032 if (c < 0xA0)
2033 goto invalid_code;
2034 code = (c & 0x7F) << 8;
2035 ONE_MORE_BYTE (c);
2036 if (c < 0xA0)
2037 goto invalid_code;
2038 code |= c & 0x7F;
2039 }
2040 break;
2041
2042 case 4:
2043 ONE_MORE_BYTE (c);
2044 if (c < 0 || (charset_ID = emacs_mule_charset[c]) < 0)
2045 goto invalid_code;
2046 ONE_MORE_BYTE (c);
2047 if (c < 0xA0)
2048 goto invalid_code;
2049 code = (c & 0x7F) << 8;
2050 ONE_MORE_BYTE (c);
2051 if (c < 0xA0)
2052 goto invalid_code;
2053 code |= c & 0x7F;
2054 break;
2055
2056 case 1:
2057 code = c;
2058 charset_ID = ASCII_BYTE_P (code) ? charset_ascii : charset_eight_bit;
2059 break;
2060
2061 default:
2062 abort ();
2063 }
2064 CODING_DECODE_CHAR (coding, src, src_base, src_end,
2065 CHARSET_FROM_ID (charset_ID), code, c);
2066 if (c < 0)
2067 goto invalid_code;
2068 }
2069 *nbytes = src - src_base;
2070 *nchars = consumed_chars;
2071 if (id)
2072 *id = charset_ID;
2073 return (mseq_found ? -c : c);
2074
2075 no_more_source:
2076 return -2;
2077
2078 invalid_code:
2079 return -1;
2080 }
2081
2082
2083 /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". */
2084
2085 /* Handle these composition sequence ('|': the end of header elements,
2086 BYTES and CHARS >= 0xA0):
2087
2088 (1) relative composition: 0x80 0xF2 BYTES CHARS | CHAR ...
2089 (2) altchar composition: 0x80 0xF4 BYTES CHARS | ALT ... ALT CHAR ...
2090 (3) alt&rule composition: 0x80 0xF5 BYTES CHARS | ALT RULE ... ALT CHAR ...
2091
2092 and these old form:
2093
2094 (4) relative composition: 0x80 | MSEQ ... MSEQ
2095 (5) rulebase composition: 0x80 0xFF | MSEQ MRULE ... MSEQ
2096
2097 When the starter 0x80 and the following header elements are found,
2098 this annotation header is produced.
2099
2100 [ -LENGTH(==-5) CODING_ANNOTATE_COMPOSITION_MASK NCHARS NBYTES METHOD ]
2101
2102 NCHARS is CHARS - 0xA0 for (1), (2), (3), and 0 for (4), (5).
2103 NBYTES is BYTES - 0xA0 for (1), (2), (3), and 0 for (4), (5).
2104
2105 Then, upon reading the following elements, these codes are produced
2106 until the composition end is found:
2107
2108 (1) CHAR ... CHAR
2109 (2) ALT ... ALT CHAR ... CHAR
2110 (3) ALT -2 DECODED-RULE ALT -2 DECODED-RULE ... ALT CHAR ... CHAR
2111 (4) CHAR ... CHAR
2112 (5) CHAR -2 DECODED-RULE CHAR -2 DECODED-RULE ... CHAR
2113
2114 When the composition end is found, LENGTH and NCHARS in the
2115 annotation header is updated as below:
2116
2117 (1) LENGTH: unchanged, NCHARS: unchanged
2118 (2) LENGTH: length of the whole sequence minus NCHARS, NCHARS: unchanged
2119 (3) LENGTH: length of the whole sequence minus NCHARS, NCHARS: unchanged
2120 (4) LENGTH: unchanged, NCHARS: number of CHARs
2121 (5) LENGTH: unchanged, NCHARS: number of CHARs
2122
2123 If an error is found while composing, the annotation header is
2124 changed to the original composition header (plus filler -1s) as
2125 below:
2126
2127 (1),(2),(3) [ 0x80 0xF2+METHOD BYTES CHARS -1 ]
2128 (5) [ 0x80 0xFF -1 -1- -1 ]
2129
2130 and the sequence [ -2 DECODED-RULE ] is changed to the original
2131 byte sequence as below:
2132 o the original byte sequence is B: [ B -1 ]
2133 o the original byte sequence is B1 B2: [ B1 B2 ]
2134
2135 Most of the routines are implemented by macros because many
2136 variables and labels in the caller decode_coding_emacs_mule must be
2137 accessible, and they are usually called just once (thus doesn't
2138 increase the size of compiled object). */
2139
2140 /* Decode a composition rule represented by C as a component of
2141 composition sequence of Emacs 20 style. Set RULE to the decoded
2142 rule. */
2143
2144 #define DECODE_EMACS_MULE_COMPOSITION_RULE_20(c, rule) \
2145 do { \
2146 int gref, nref; \
2147 \
2148 c -= 0xA0; \
2149 if (c < 0 || c >= 81) \
2150 goto invalid_code; \
2151 gref = c / 9, nref = c % 9; \
2152 if (gref == 4) gref = 10; \
2153 if (nref == 4) nref = 10; \
2154 rule = COMPOSITION_ENCODE_RULE (gref, nref); \
2155 } while (0)
2156
2157
2158 /* Decode a composition rule represented by C and the following byte
2159 at SRC as a component of composition sequence of Emacs 21 style.
2160 Set RULE to the decoded rule. */
2161
2162 #define DECODE_EMACS_MULE_COMPOSITION_RULE_21(c, rule) \
2163 do { \
2164 int gref, nref; \
2165 \
2166 gref = c - 0x20; \
2167 if (gref < 0 || gref >= 81) \
2168 goto invalid_code; \
2169 ONE_MORE_BYTE (c); \
2170 nref = c - 0x20; \
2171 if (nref < 0 || nref >= 81) \
2172 goto invalid_code; \
2173 rule = COMPOSITION_ENCODE_RULE (gref, nref); \
2174 } while (0)
2175
2176
2177 /* Start of Emacs 21 style format. The first three bytes at SRC are
2178 (METHOD - 0xF2), (BYTES - 0xA0), (CHARS - 0xA0), where BYTES is the
2179 byte length of this composition information, CHARS is the number of
2180 characters composed by this composition. */
2181
2182 #define DECODE_EMACS_MULE_21_COMPOSITION() \
2183 do { \
2184 enum composition_method method = c - 0xF2; \
2185 int nbytes, nchars; \
2186 \
2187 ONE_MORE_BYTE (c); \
2188 if (c < 0) \
2189 goto invalid_code; \
2190 nbytes = c - 0xA0; \
2191 if (nbytes < 3 || (method == COMPOSITION_RELATIVE && nbytes != 4)) \
2192 goto invalid_code; \
2193 ONE_MORE_BYTE (c); \
2194 nchars = c - 0xA0; \
2195 if (nchars <= 0 || nchars >= MAX_COMPOSITION_COMPONENTS) \
2196 goto invalid_code; \
2197 cmp_status->old_form = 0; \
2198 cmp_status->method = method; \
2199 if (method == COMPOSITION_RELATIVE) \
2200 cmp_status->state = COMPOSING_CHAR; \
2201 else \
2202 cmp_status->state = COMPOSING_COMPONENT_CHAR; \
2203 cmp_status->length = MAX_ANNOTATION_LENGTH; \
2204 cmp_status->nchars = nchars; \
2205 cmp_status->ncomps = nbytes - 4; \
2206 ADD_COMPOSITION_DATA (charbuf, nchars, nbytes, method); \
2207 } while (0)
2208
2209
2210 /* Start of Emacs 20 style format for relative composition. */
2211
2212 #define DECODE_EMACS_MULE_20_RELATIVE_COMPOSITION() \
2213 do { \
2214 cmp_status->old_form = 1; \
2215 cmp_status->method = COMPOSITION_RELATIVE; \
2216 cmp_status->state = COMPOSING_CHAR; \
2217 cmp_status->length = MAX_ANNOTATION_LENGTH; \
2218 cmp_status->nchars = cmp_status->ncomps = 0; \
2219 ADD_COMPOSITION_DATA (charbuf, 0, 0, cmp_status->method); \
2220 } while (0)
2221
2222
2223 /* Start of Emacs 20 style format for rule-base composition. */
2224
2225 #define DECODE_EMACS_MULE_20_RULEBASE_COMPOSITION() \
2226 do { \
2227 cmp_status->old_form = 1; \
2228 cmp_status->method = COMPOSITION_WITH_RULE; \
2229 cmp_status->state = COMPOSING_CHAR; \
2230 cmp_status->length = MAX_ANNOTATION_LENGTH; \
2231 cmp_status->nchars = cmp_status->ncomps = 0; \
2232 ADD_COMPOSITION_DATA (charbuf, 0, 0, cmp_status->method); \
2233 } while (0)
2234
2235
2236 #define DECODE_EMACS_MULE_COMPOSITION_START() \
2237 do { \
2238 const unsigned char *current_src = src; \
2239 \
2240 ONE_MORE_BYTE (c); \
2241 if (c < 0) \
2242 goto invalid_code; \
2243 if (c - 0xF2 >= COMPOSITION_RELATIVE \
2244 && c - 0xF2 <= COMPOSITION_WITH_RULE_ALTCHARS) \
2245 DECODE_EMACS_MULE_21_COMPOSITION (); \
2246 else if (c < 0xA0) \
2247 goto invalid_code; \
2248 else if (c < 0xC0) \
2249 { \
2250 DECODE_EMACS_MULE_20_RELATIVE_COMPOSITION (); \
2251 /* Re-read C as a composition component. */ \
2252 src = current_src; \
2253 } \
2254 else if (c == 0xFF) \
2255 DECODE_EMACS_MULE_20_RULEBASE_COMPOSITION (); \
2256 else \
2257 goto invalid_code; \
2258 } while (0)
2259
2260 #define EMACS_MULE_COMPOSITION_END() \
2261 do { \
2262 int idx = - cmp_status->length; \
2263 \
2264 if (cmp_status->old_form) \
2265 charbuf[idx + 2] = cmp_status->nchars; \
2266 else if (cmp_status->method > COMPOSITION_RELATIVE) \
2267 charbuf[idx] = charbuf[idx + 2] - cmp_status->length; \
2268 cmp_status->state = COMPOSING_NO; \
2269 } while (0)
2270
2271
2272 static int
2273 emacs_mule_finish_composition (int *charbuf,
2274 struct composition_status *cmp_status)
2275 {
2276 int idx = - cmp_status->length;
2277 int new_chars;
2278
2279 if (cmp_status->old_form && cmp_status->nchars > 0)
2280 {
2281 charbuf[idx + 2] = cmp_status->nchars;
2282 new_chars = 0;
2283 if (cmp_status->method == COMPOSITION_WITH_RULE
2284 && cmp_status->state == COMPOSING_CHAR)
2285 {
2286 /* The last rule was invalid. */
2287 int rule = charbuf[-1] + 0xA0;
2288
2289 charbuf[-2] = BYTE8_TO_CHAR (rule);
2290 charbuf[-1] = -1;
2291 new_chars = 1;
2292 }
2293 }
2294 else
2295 {
2296 charbuf[idx++] = BYTE8_TO_CHAR (0x80);
2297
2298 if (cmp_status->method == COMPOSITION_WITH_RULE)
2299 {
2300 charbuf[idx++] = BYTE8_TO_CHAR (0xFF);
2301 charbuf[idx++] = -3;
2302 charbuf[idx++] = 0;
2303 new_chars = 1;
2304 }
2305 else
2306 {
2307 int nchars = charbuf[idx + 1] + 0xA0;
2308 int nbytes = charbuf[idx + 2] + 0xA0;
2309
2310 charbuf[idx++] = BYTE8_TO_CHAR (0xF2 + cmp_status->method);
2311 charbuf[idx++] = BYTE8_TO_CHAR (nbytes);
2312 charbuf[idx++] = BYTE8_TO_CHAR (nchars);
2313 charbuf[idx++] = -1;
2314 new_chars = 4;
2315 }
2316 }
2317 cmp_status->state = COMPOSING_NO;
2318 return new_chars;
2319 }
2320
2321 #define EMACS_MULE_MAYBE_FINISH_COMPOSITION() \
2322 do { \
2323 if (cmp_status->state != COMPOSING_NO) \
2324 char_offset += emacs_mule_finish_composition (charbuf, cmp_status); \
2325 } while (0)
2326
2327
2328 static void
2329 decode_coding_emacs_mule (struct coding_system *coding)
2330 {
2331 const unsigned char *src = coding->source + coding->consumed;
2332 const unsigned char *src_end = coding->source + coding->src_bytes;
2333 const unsigned char *src_base;
2334 int *charbuf = coding->charbuf + coding->charbuf_used;
2335 /* We may produce two annotations (charset and composition) in one
2336 loop and one more charset annotation at the end. */
2337 int *charbuf_end
2338 = coding->charbuf + coding->charbuf_size - (MAX_ANNOTATION_LENGTH * 3)
2339 /* We can produce up to 2 characters in a loop. */
2340 - 1;
2341 EMACS_INT consumed_chars = 0, consumed_chars_base;
2342 int multibytep = coding->src_multibyte;
2343 EMACS_INT char_offset = coding->produced_char;
2344 EMACS_INT last_offset = char_offset;
2345 int last_id = charset_ascii;
2346 int eol_dos =
2347 !inhibit_eol_conversion && EQ (CODING_ID_EOL_TYPE (coding->id), Qdos);
2348 int byte_after_cr = -1;
2349 struct composition_status *cmp_status = &coding->spec.emacs_mule.cmp_status;
2350
2351 if (cmp_status->state != COMPOSING_NO)
2352 {
2353 int i;
2354
2355 if (charbuf_end - charbuf < cmp_status->length)
2356 abort ();
2357 for (i = 0; i < cmp_status->length; i++)
2358 *charbuf++ = cmp_status->carryover[i];
2359 coding->annotated = 1;
2360 }
2361
2362 while (1)
2363 {
2364 int c, id IF_LINT (= 0);
2365
2366 src_base = src;
2367 consumed_chars_base = consumed_chars;
2368
2369 if (charbuf >= charbuf_end)
2370 {
2371 if (byte_after_cr >= 0)
2372 src_base--;
2373 break;
2374 }
2375
2376 if (byte_after_cr >= 0)
2377 c = byte_after_cr, byte_after_cr = -1;
2378 else
2379 ONE_MORE_BYTE (c);
2380
2381 if (c < 0 || c == 0x80)
2382 {
2383 EMACS_MULE_MAYBE_FINISH_COMPOSITION ();
2384 if (c < 0)
2385 {
2386 *charbuf++ = -c;
2387 char_offset++;
2388 }
2389 else
2390 DECODE_EMACS_MULE_COMPOSITION_START ();
2391 continue;
2392 }
2393
2394 if (c < 0x80)
2395 {
2396 if (eol_dos && c == '\r')
2397 ONE_MORE_BYTE (byte_after_cr);
2398 id = charset_ascii;
2399 if (cmp_status->state != COMPOSING_NO)
2400 {
2401 if (cmp_status->old_form)
2402 EMACS_MULE_MAYBE_FINISH_COMPOSITION ();
2403 else if (cmp_status->state >= COMPOSING_COMPONENT_CHAR)
2404 cmp_status->ncomps--;
2405 }
2406 }
2407 else
2408 {
2409 int nchars IF_LINT (= 0), nbytes IF_LINT (= 0);
2410 /* emacs_mule_char can load a charset map from a file, which
2411 allocates a large structure and might cause buffer text
2412 to be relocated as result. Thus, we need to remember the
2413 original pointer to buffer text, and fix up all related
2414 pointers after the call. */
2415 const unsigned char *orig = coding->source;
2416 EMACS_INT offset;
2417
2418 c = emacs_mule_char (coding, src_base, &nbytes, &nchars, &id,
2419 cmp_status);
2420 offset = coding->source - orig;
2421 if (offset)
2422 {
2423 src += offset;
2424 src_base += offset;
2425 src_end += offset;
2426 }
2427 if (c < 0)
2428 {
2429 if (c == -1)
2430 goto invalid_code;
2431 if (c == -2)
2432 break;
2433 }
2434 src = src_base + nbytes;
2435 consumed_chars = consumed_chars_base + nchars;
2436 if (cmp_status->state >= COMPOSING_COMPONENT_CHAR)
2437 cmp_status->ncomps -= nchars;
2438 }
2439
2440 /* Now if C >= 0, we found a normally encoded character, if C <
2441 0, we found an old-style composition component character or
2442 rule. */
2443
2444 if (cmp_status->state == COMPOSING_NO)
2445 {
2446 if (last_id != id)
2447 {
2448 if (last_id != charset_ascii)
2449 ADD_CHARSET_DATA (charbuf, char_offset - last_offset,
2450 last_id);
2451 last_id = id;
2452 last_offset = char_offset;
2453 }
2454 *charbuf++ = c;
2455 char_offset++;
2456 }
2457 else if (cmp_status->state == COMPOSING_CHAR)
2458 {
2459 if (cmp_status->old_form)
2460 {
2461 if (c >= 0)
2462 {
2463 EMACS_MULE_MAYBE_FINISH_COMPOSITION ();
2464 *charbuf++ = c;
2465 char_offset++;
2466 }
2467 else
2468 {
2469 *charbuf++ = -c;
2470 cmp_status->nchars++;
2471 cmp_status->length++;
2472 if (cmp_status->nchars == MAX_COMPOSITION_COMPONENTS)
2473 EMACS_MULE_COMPOSITION_END ();
2474 else if (cmp_status->method == COMPOSITION_WITH_RULE)
2475 cmp_status->state = COMPOSING_RULE;
2476 }
2477 }
2478 else
2479 {
2480 *charbuf++ = c;
2481 cmp_status->length++;
2482 cmp_status->nchars--;
2483 if (cmp_status->nchars == 0)
2484 EMACS_MULE_COMPOSITION_END ();
2485 }
2486 }
2487 else if (cmp_status->state == COMPOSING_RULE)
2488 {
2489 int rule;
2490
2491 if (c >= 0)
2492 {
2493 EMACS_MULE_COMPOSITION_END ();
2494 *charbuf++ = c;
2495 char_offset++;
2496 }
2497 else
2498 {
2499 c = -c;
2500 DECODE_EMACS_MULE_COMPOSITION_RULE_20 (c, rule);
2501 if (rule < 0)
2502 goto invalid_code;
2503 *charbuf++ = -2;
2504 *charbuf++ = rule;
2505 cmp_status->length += 2;
2506 cmp_status->state = COMPOSING_CHAR;
2507 }
2508 }
2509 else if (cmp_status->state == COMPOSING_COMPONENT_CHAR)
2510 {
2511 *charbuf++ = c;
2512 cmp_status->length++;
2513 if (cmp_status->ncomps == 0)
2514 cmp_status->state = COMPOSING_CHAR;
2515 else if (cmp_status->ncomps > 0)
2516 {
2517 if (cmp_status->method == COMPOSITION_WITH_RULE_ALTCHARS)
2518 cmp_status->state = COMPOSING_COMPONENT_RULE;
2519 }
2520 else
2521 EMACS_MULE_MAYBE_FINISH_COMPOSITION ();
2522 }
2523 else /* COMPOSING_COMPONENT_RULE */
2524 {
2525 int rule;
2526
2527 DECODE_EMACS_MULE_COMPOSITION_RULE_21 (c, rule);
2528 if (rule < 0)
2529 goto invalid_code;
2530 *charbuf++ = -2;
2531 *charbuf++ = rule;
2532 cmp_status->length += 2;
2533 cmp_status->ncomps--;
2534 if (cmp_status->ncomps > 0)
2535 cmp_status->state = COMPOSING_COMPONENT_CHAR;
2536 else
2537 EMACS_MULE_MAYBE_FINISH_COMPOSITION ();
2538 }
2539 continue;
2540
2541 invalid_code:
2542 EMACS_MULE_MAYBE_FINISH_COMPOSITION ();
2543 src = src_base;
2544 consumed_chars = consumed_chars_base;
2545 ONE_MORE_BYTE (c);
2546 *charbuf++ = ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c);
2547 char_offset++;
2548 coding->errors++;
2549 }
2550
2551 no_more_source:
2552 if (cmp_status->state != COMPOSING_NO)
2553 {
2554 if (coding->mode & CODING_MODE_LAST_BLOCK)
2555 EMACS_MULE_MAYBE_FINISH_COMPOSITION ();
2556 else
2557 {
2558 int i;
2559
2560 charbuf -= cmp_status->length;
2561 for (i = 0; i < cmp_status->length; i++)
2562 cmp_status->carryover[i] = charbuf[i];
2563 }
2564 }
2565 if (last_id != charset_ascii)
2566 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
2567 coding->consumed_char += consumed_chars_base;
2568 coding->consumed = src_base - coding->source;
2569 coding->charbuf_used = charbuf - coding->charbuf;
2570 }
2571
2572
2573 #define EMACS_MULE_LEADING_CODES(id, codes) \
2574 do { \
2575 if (id < 0xA0) \
2576 codes[0] = id, codes[1] = 0; \
2577 else if (id < 0xE0) \
2578 codes[0] = 0x9A, codes[1] = id; \
2579 else if (id < 0xF0) \
2580 codes[0] = 0x9B, codes[1] = id; \
2581 else if (id < 0xF5) \
2582 codes[0] = 0x9C, codes[1] = id; \
2583 else \
2584 codes[0] = 0x9D, codes[1] = id; \
2585 } while (0);
2586
2587
2588 static int
2589 encode_coding_emacs_mule (struct coding_system *coding)
2590 {
2591 int multibytep = coding->dst_multibyte;
2592 int *charbuf = coding->charbuf;
2593 int *charbuf_end = charbuf + coding->charbuf_used;
2594 unsigned char *dst = coding->destination + coding->produced;
2595 unsigned char *dst_end = coding->destination + coding->dst_bytes;
2596 int safe_room = 8;
2597 EMACS_INT produced_chars = 0;
2598 Lisp_Object attrs, charset_list;
2599 int c;
2600 int preferred_charset_id = -1;
2601
2602 CODING_GET_INFO (coding, attrs, charset_list);
2603 if (! EQ (charset_list, Vemacs_mule_charset_list))
2604 {
2605 CODING_ATTR_CHARSET_LIST (attrs)
2606 = charset_list = Vemacs_mule_charset_list;
2607 }
2608
2609 while (charbuf < charbuf_end)
2610 {
2611 ASSURE_DESTINATION (safe_room);
2612 c = *charbuf++;
2613
2614 if (c < 0)
2615 {
2616 /* Handle an annotation. */
2617 switch (*charbuf)
2618 {
2619 case CODING_ANNOTATE_COMPOSITION_MASK:
2620 /* Not yet implemented. */
2621 break;
2622 case CODING_ANNOTATE_CHARSET_MASK:
2623 preferred_charset_id = charbuf[3];
2624 if (preferred_charset_id >= 0
2625 && NILP (Fmemq (make_number (preferred_charset_id),
2626 charset_list)))
2627 preferred_charset_id = -1;
2628 break;
2629 default:
2630 abort ();
2631 }
2632 charbuf += -c - 1;
2633 continue;
2634 }
2635
2636 if (ASCII_CHAR_P (c))
2637 EMIT_ONE_ASCII_BYTE (c);
2638 else if (CHAR_BYTE8_P (c))
2639 {
2640 c = CHAR_TO_BYTE8 (c);
2641 EMIT_ONE_BYTE (c);
2642 }
2643 else
2644 {
2645 struct charset *charset;
2646 unsigned code;
2647 int dimension;
2648 int emacs_mule_id;
2649 unsigned char leading_codes[2];
2650
2651 if (preferred_charset_id >= 0)
2652 {
2653 charset = CHARSET_FROM_ID (preferred_charset_id);
2654 if (CHAR_CHARSET_P (c, charset))
2655 code = ENCODE_CHAR (charset, c);
2656 else
2657 charset = char_charset (c, charset_list, &code);
2658 }
2659 else
2660 charset = char_charset (c, charset_list, &code);
2661 if (! charset)
2662 {
2663 c = coding->default_char;
2664 if (ASCII_CHAR_P (c))
2665 {
2666 EMIT_ONE_ASCII_BYTE (c);
2667 continue;
2668 }
2669 charset = char_charset (c, charset_list, &code);
2670 }
2671 dimension = CHARSET_DIMENSION (charset);
2672 emacs_mule_id = CHARSET_EMACS_MULE_ID (charset);
2673 EMACS_MULE_LEADING_CODES (emacs_mule_id, leading_codes);
2674 EMIT_ONE_BYTE (leading_codes[0]);
2675 if (leading_codes[1])
2676 EMIT_ONE_BYTE (leading_codes[1]);
2677 if (dimension == 1)
2678 EMIT_ONE_BYTE (code | 0x80);
2679 else
2680 {
2681 code |= 0x8080;
2682 EMIT_ONE_BYTE (code >> 8);
2683 EMIT_ONE_BYTE (code & 0xFF);
2684 }
2685 }
2686 }
2687 record_conversion_result (coding, CODING_RESULT_SUCCESS);
2688 coding->produced_char += produced_chars;
2689 coding->produced = dst - coding->destination;
2690 return 0;
2691 }
2692
2693 \f
2694 /*** 7. ISO2022 handlers ***/
2695
2696 /* The following note describes the coding system ISO2022 briefly.
2697 Since the intention of this note is to help understand the
2698 functions in this file, some parts are NOT ACCURATE or are OVERLY
2699 SIMPLIFIED. For thorough understanding, please refer to the
2700 original document of ISO2022. This is equivalent to the standard
2701 ECMA-35, obtainable from <URL:http://www.ecma.ch/> (*).
2702
2703 ISO2022 provides many mechanisms to encode several character sets
2704 in 7-bit and 8-bit environments. For 7-bit environments, all text
2705 is encoded using bytes less than 128. This may make the encoded
2706 text a little bit longer, but the text passes more easily through
2707 several types of gateway, some of which strip off the MSB (Most
2708 Significant Bit).
2709
2710 There are two kinds of character sets: control character sets and
2711 graphic character sets. The former contain control characters such
2712 as `newline' and `escape' to provide control functions (control
2713 functions are also provided by escape sequences). The latter
2714 contain graphic characters such as 'A' and '-'. Emacs recognizes
2715 two control character sets and many graphic character sets.
2716
2717 Graphic character sets are classified into one of the following
2718 four classes, according to the number of bytes (DIMENSION) and
2719 number of characters in one dimension (CHARS) of the set:
2720 - DIMENSION1_CHARS94
2721 - DIMENSION1_CHARS96
2722 - DIMENSION2_CHARS94
2723 - DIMENSION2_CHARS96
2724
2725 In addition, each character set is assigned an identification tag,
2726 unique for each set, called the "final character" (denoted as <F>
2727 hereafter). The <F> of each character set is decided by ECMA(*)
2728 when it is registered in ISO. The code range of <F> is 0x30..0x7F
2729 (0x30..0x3F are for private use only).
2730
2731 Note (*): ECMA = European Computer Manufacturers Association
2732
2733 Here are examples of graphic character sets [NAME(<F>)]:
2734 o DIMENSION1_CHARS94 -- ASCII('B'), right-half-of-JISX0201('I'), ...
2735 o DIMENSION1_CHARS96 -- right-half-of-ISO8859-1('A'), ...
2736 o DIMENSION2_CHARS94 -- GB2312('A'), JISX0208('B'), ...
2737 o DIMENSION2_CHARS96 -- none for the moment
2738
2739 A code area (1 byte=8 bits) is divided into 4 areas, C0, GL, C1, and GR.
2740 C0 [0x00..0x1F] -- control character plane 0
2741 GL [0x20..0x7F] -- graphic character plane 0
2742 C1 [0x80..0x9F] -- control character plane 1
2743 GR [0xA0..0xFF] -- graphic character plane 1
2744
2745 A control character set is directly designated and invoked to C0 or
2746 C1 by an escape sequence. The most common case is that:
2747 - ISO646's control character set is designated/invoked to C0, and
2748 - ISO6429's control character set is designated/invoked to C1,
2749 and usually these designations/invocations are omitted in encoded
2750 text. In a 7-bit environment, only C0 can be used, and a control
2751 character for C1 is encoded by an appropriate escape sequence to
2752 fit into the environment. All control characters for C1 are
2753 defined to have corresponding escape sequences.
2754
2755 A graphic character set is at first designated to one of four
2756 graphic registers (G0 through G3), then these graphic registers are
2757 invoked to GL or GR. These designations and invocations can be
2758 done independently. The most common case is that G0 is invoked to
2759 GL, G1 is invoked to GR, and ASCII is designated to G0. Usually
2760 these invocations and designations are omitted in encoded text.
2761 In a 7-bit environment, only GL can be used.
2762
2763 When a graphic character set of CHARS94 is invoked to GL, codes
2764 0x20 and 0x7F of the GL area work as control characters SPACE and
2765 DEL respectively, and codes 0xA0 and 0xFF of the GR area should not
2766 be used.
2767
2768 There are two ways of invocation: locking-shift and single-shift.
2769 With locking-shift, the invocation lasts until the next different
2770 invocation, whereas with single-shift, the invocation affects the
2771 following character only and doesn't affect the locking-shift
2772 state. Invocations are done by the following control characters or
2773 escape sequences:
2774
2775 ----------------------------------------------------------------------
2776 abbrev function cntrl escape seq description
2777 ----------------------------------------------------------------------
2778 SI/LS0 (shift-in) 0x0F none invoke G0 into GL
2779 SO/LS1 (shift-out) 0x0E none invoke G1 into GL
2780 LS2 (locking-shift-2) none ESC 'n' invoke G2 into GL
2781 LS3 (locking-shift-3) none ESC 'o' invoke G3 into GL
2782 LS1R (locking-shift-1 right) none ESC '~' invoke G1 into GR (*)
2783 LS2R (locking-shift-2 right) none ESC '}' invoke G2 into GR (*)
2784 LS3R (locking-shift 3 right) none ESC '|' invoke G3 into GR (*)
2785 SS2 (single-shift-2) 0x8E ESC 'N' invoke G2 for one char
2786 SS3 (single-shift-3) 0x8F ESC 'O' invoke G3 for one char
2787 ----------------------------------------------------------------------
2788 (*) These are not used by any known coding system.
2789
2790 Control characters for these functions are defined by macros
2791 ISO_CODE_XXX in `coding.h'.
2792
2793 Designations are done by the following escape sequences:
2794 ----------------------------------------------------------------------
2795 escape sequence description
2796 ----------------------------------------------------------------------
2797 ESC '(' <F> designate DIMENSION1_CHARS94<F> to G0
2798 ESC ')' <F> designate DIMENSION1_CHARS94<F> to G1
2799 ESC '*' <F> designate DIMENSION1_CHARS94<F> to G2
2800 ESC '+' <F> designate DIMENSION1_CHARS94<F> to G3
2801 ESC ',' <F> designate DIMENSION1_CHARS96<F> to G0 (*)
2802 ESC '-' <F> designate DIMENSION1_CHARS96<F> to G1
2803 ESC '.' <F> designate DIMENSION1_CHARS96<F> to G2
2804 ESC '/' <F> designate DIMENSION1_CHARS96<F> to G3
2805 ESC '$' '(' <F> designate DIMENSION2_CHARS94<F> to G0 (**)
2806 ESC '$' ')' <F> designate DIMENSION2_CHARS94<F> to G1
2807 ESC '$' '*' <F> designate DIMENSION2_CHARS94<F> to G2
2808 ESC '$' '+' <F> designate DIMENSION2_CHARS94<F> to G3
2809 ESC '$' ',' <F> designate DIMENSION2_CHARS96<F> to G0 (*)
2810 ESC '$' '-' <F> designate DIMENSION2_CHARS96<F> to G1
2811 ESC '$' '.' <F> designate DIMENSION2_CHARS96<F> to G2
2812 ESC '$' '/' <F> designate DIMENSION2_CHARS96<F> to G3
2813 ----------------------------------------------------------------------
2814
2815 In this list, "DIMENSION1_CHARS94<F>" means a graphic character set
2816 of dimension 1, chars 94, and final character <F>, etc...
2817
2818 Note (*): Although these designations are not allowed in ISO2022,
2819 Emacs accepts them on decoding, and produces them on encoding
2820 CHARS96 character sets in a coding system which is characterized as
2821 7-bit environment, non-locking-shift, and non-single-shift.
2822
2823 Note (**): If <F> is '@', 'A', or 'B', the intermediate character
2824 '(' must be omitted. We refer to this as "short-form" hereafter.
2825
2826 Now you may notice that there are a lot of ways of encoding the
2827 same multilingual text in ISO2022. Actually, there exist many
2828 coding systems such as Compound Text (used in X11's inter client
2829 communication, ISO-2022-JP (used in Japanese Internet), ISO-2022-KR
2830 (used in Korean Internet), EUC (Extended UNIX Code, used in Asian
2831 localized platforms), and all of these are variants of ISO2022.
2832
2833 In addition to the above, Emacs handles two more kinds of escape
2834 sequences: ISO6429's direction specification and Emacs' private
2835 sequence for specifying character composition.
2836
2837 ISO6429's direction specification takes the following form:
2838 o CSI ']' -- end of the current direction
2839 o CSI '0' ']' -- end of the current direction
2840 o CSI '1' ']' -- start of left-to-right text
2841 o CSI '2' ']' -- start of right-to-left text
2842 The control character CSI (0x9B: control sequence introducer) is
2843 abbreviated to the escape sequence ESC '[' in a 7-bit environment.
2844
2845 Character composition specification takes the following form:
2846 o ESC '0' -- start relative composition
2847 o ESC '1' -- end composition
2848 o ESC '2' -- start rule-base composition (*)
2849 o ESC '3' -- start relative composition with alternate chars (**)
2850 o ESC '4' -- start rule-base composition with alternate chars (**)
2851 Since these are not standard escape sequences of any ISO standard,
2852 the use of them with these meanings is restricted to Emacs only.
2853
2854 (*) This form is used only in Emacs 20.7 and older versions,
2855 but newer versions can safely decode it.
2856 (**) This form is used only in Emacs 21.1 and newer versions,
2857 and older versions can't decode it.
2858
2859 Here's a list of example usages of these composition escape
2860 sequences (categorized by `enum composition_method').
2861
2862 COMPOSITION_RELATIVE:
2863 ESC 0 CHAR [ CHAR ] ESC 1
2864 COMPOSITION_WITH_RULE:
2865 ESC 2 CHAR [ RULE CHAR ] ESC 1
2866 COMPOSITION_WITH_ALTCHARS:
2867 ESC 3 ALTCHAR [ ALTCHAR ] ESC 0 CHAR [ CHAR ] ESC 1
2868 COMPOSITION_WITH_RULE_ALTCHARS:
2869 ESC 4 ALTCHAR [ RULE ALTCHAR ] ESC 0 CHAR [ CHAR ] ESC 1 */
2870
2871 static enum iso_code_class_type iso_code_class[256];
2872
2873 #define SAFE_CHARSET_P(coding, id) \
2874 ((id) <= (coding)->max_charset_id \
2875 && (coding)->safe_charsets[id] != 255)
2876
2877 static void
2878 setup_iso_safe_charsets (Lisp_Object attrs)
2879 {
2880 Lisp_Object charset_list, safe_charsets;
2881 Lisp_Object request;
2882 Lisp_Object reg_usage;
2883 Lisp_Object tail;
2884 int reg94, reg96;
2885 int flags = XINT (AREF (attrs, coding_attr_iso_flags));
2886 int max_charset_id;
2887
2888 charset_list = CODING_ATTR_CHARSET_LIST (attrs);
2889 if ((flags & CODING_ISO_FLAG_FULL_SUPPORT)
2890 && ! EQ (charset_list, Viso_2022_charset_list))
2891 {
2892 CODING_ATTR_CHARSET_LIST (attrs)
2893 = charset_list = Viso_2022_charset_list;
2894 ASET (attrs, coding_attr_safe_charsets, Qnil);
2895 }
2896
2897 if (STRINGP (AREF (attrs, coding_attr_safe_charsets)))
2898 return;
2899
2900 max_charset_id = 0;
2901 for (tail = charset_list; CONSP (tail); tail = XCDR (tail))
2902 {
2903 int id = XINT (XCAR (tail));
2904 if (max_charset_id < id)
2905 max_charset_id = id;
2906 }
2907
2908 safe_charsets = make_uninit_string (max_charset_id + 1);
2909 memset (SDATA (safe_charsets), 255, max_charset_id + 1);
2910 request = AREF (attrs, coding_attr_iso_request);
2911 reg_usage = AREF (attrs, coding_attr_iso_usage);
2912 reg94 = XINT (XCAR (reg_usage));
2913 reg96 = XINT (XCDR (reg_usage));
2914
2915 for (tail = charset_list; CONSP (tail); tail = XCDR (tail))
2916 {
2917 Lisp_Object id;
2918 Lisp_Object reg;
2919 struct charset *charset;
2920
2921 id = XCAR (tail);
2922 charset = CHARSET_FROM_ID (XINT (id));
2923 reg = Fcdr (Fassq (id, request));
2924 if (! NILP (reg))
2925 SSET (safe_charsets, XINT (id), XINT (reg));
2926 else if (charset->iso_chars_96)
2927 {
2928 if (reg96 < 4)
2929 SSET (safe_charsets, XINT (id), reg96);
2930 }
2931 else
2932 {
2933 if (reg94 < 4)
2934 SSET (safe_charsets, XINT (id), reg94);
2935 }
2936 }
2937 ASET (attrs, coding_attr_safe_charsets, safe_charsets);
2938 }
2939
2940
2941 /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
2942 Check if a text is encoded in one of ISO-2022 based coding systems.
2943 If it is, return 1, else return 0. */
2944
2945 static int
2946 detect_coding_iso_2022 (struct coding_system *coding,
2947 struct coding_detection_info *detect_info)
2948 {
2949 const unsigned char *src = coding->source, *src_base = src;
2950 const unsigned char *src_end = coding->source + coding->src_bytes;
2951 int multibytep = coding->src_multibyte;
2952 int single_shifting = 0;
2953 int id;
2954 int c, c1;
2955 EMACS_INT consumed_chars = 0;
2956 int i;
2957 int rejected = 0;
2958 int found = 0;
2959 int composition_count = -1;
2960
2961 detect_info->checked |= CATEGORY_MASK_ISO;
2962
2963 for (i = coding_category_iso_7; i <= coding_category_iso_8_else; i++)
2964 {
2965 struct coding_system *this = &(coding_categories[i]);
2966 Lisp_Object attrs, val;
2967
2968 if (this->id < 0)
2969 continue;
2970 attrs = CODING_ID_ATTRS (this->id);
2971 if (CODING_ISO_FLAGS (this) & CODING_ISO_FLAG_FULL_SUPPORT
2972 && ! EQ (CODING_ATTR_CHARSET_LIST (attrs), Viso_2022_charset_list))
2973 setup_iso_safe_charsets (attrs);
2974 val = CODING_ATTR_SAFE_CHARSETS (attrs);
2975 this->max_charset_id = SCHARS (val) - 1;
2976 this->safe_charsets = SDATA (val);
2977 }
2978
2979 /* A coding system of this category is always ASCII compatible. */
2980 src += coding->head_ascii;
2981
2982 while (rejected != CATEGORY_MASK_ISO)
2983 {
2984 src_base = src;
2985 ONE_MORE_BYTE (c);
2986 switch (c)
2987 {
2988 case ISO_CODE_ESC:
2989 if (inhibit_iso_escape_detection)
2990 break;
2991 single_shifting = 0;
2992 ONE_MORE_BYTE (c);
2993 if (c == 'N' || c == 'O')
2994 {
2995 /* ESC <Fe> for SS2 or SS3. */
2996 single_shifting = 1;
2997 rejected |= CATEGORY_MASK_ISO_7BIT | CATEGORY_MASK_ISO_8BIT;
2998 }
2999 else if (c == '1')
3000 {
3001 /* End of composition. */
3002 if (composition_count < 0
3003 || composition_count > MAX_COMPOSITION_COMPONENTS)
3004 /* Invalid */
3005 break;
3006 composition_count = -1;
3007 found |= CATEGORY_MASK_ISO;
3008 }
3009 else if (c >= '0' && c <= '4')
3010 {
3011 /* ESC <Fp> for start/end composition. */
3012 composition_count = 0;
3013 }
3014 else
3015 {
3016 if (c >= '(' && c <= '/')
3017 {
3018 /* Designation sequence for a charset of dimension 1. */
3019 ONE_MORE_BYTE (c1);
3020 if (c1 < ' ' || c1 >= 0x80
3021 || (id = iso_charset_table[0][c >= ','][c1]) < 0)
3022 /* Invalid designation sequence. Just ignore. */
3023 break;
3024 }
3025 else if (c == '$')
3026 {
3027 /* Designation sequence for a charset of dimension 2. */
3028 ONE_MORE_BYTE (c);
3029 if (c >= '@' && c <= 'B')
3030 /* Designation for JISX0208.1978, GB2312, or JISX0208. */
3031 id = iso_charset_table[1][0][c];
3032 else if (c >= '(' && c <= '/')
3033 {
3034 ONE_MORE_BYTE (c1);
3035 if (c1 < ' ' || c1 >= 0x80
3036 || (id = iso_charset_table[1][c >= ','][c1]) < 0)
3037 /* Invalid designation sequence. Just ignore. */
3038 break;
3039 }
3040 else
3041 /* Invalid designation sequence. Just ignore it. */
3042 break;
3043 }
3044 else
3045 {
3046 /* Invalid escape sequence. Just ignore it. */
3047 break;
3048 }
3049
3050 /* We found a valid designation sequence for CHARSET. */
3051 rejected |= CATEGORY_MASK_ISO_8BIT;
3052 if (SAFE_CHARSET_P (&coding_categories[coding_category_iso_7],
3053 id))
3054 found |= CATEGORY_MASK_ISO_7;
3055 else
3056 rejected |= CATEGORY_MASK_ISO_7;
3057 if (SAFE_CHARSET_P (&coding_categories[coding_category_iso_7_tight],
3058 id))
3059 found |= CATEGORY_MASK_ISO_7_TIGHT;
3060 else
3061 rejected |= CATEGORY_MASK_ISO_7_TIGHT;
3062 if (SAFE_CHARSET_P (&coding_categories[coding_category_iso_7_else],
3063 id))
3064 found |= CATEGORY_MASK_ISO_7_ELSE;
3065 else
3066 rejected |= CATEGORY_MASK_ISO_7_ELSE;
3067 if (SAFE_CHARSET_P (&coding_categories[coding_category_iso_8_else],
3068 id))
3069 found |= CATEGORY_MASK_ISO_8_ELSE;
3070 else
3071 rejected |= CATEGORY_MASK_ISO_8_ELSE;
3072 }
3073 break;
3074
3075 case ISO_CODE_SO:
3076 case ISO_CODE_SI:
3077 /* Locking shift out/in. */
3078 if (inhibit_iso_escape_detection)
3079 break;
3080 single_shifting = 0;
3081 rejected |= CATEGORY_MASK_ISO_7BIT | CATEGORY_MASK_ISO_8BIT;
3082 break;
3083
3084 case ISO_CODE_CSI:
3085 /* Control sequence introducer. */
3086 single_shifting = 0;
3087 rejected |= CATEGORY_MASK_ISO_7BIT | CATEGORY_MASK_ISO_7_ELSE;
3088 found |= CATEGORY_MASK_ISO_8_ELSE;
3089 goto check_extra_latin;
3090
3091 case ISO_CODE_SS2:
3092 case ISO_CODE_SS3:
3093 /* Single shift. */
3094 if (inhibit_iso_escape_detection)
3095 break;
3096 single_shifting = 0;
3097 rejected |= CATEGORY_MASK_ISO_7BIT;
3098 if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_1])
3099 & CODING_ISO_FLAG_SINGLE_SHIFT)
3100 {
3101 found |= CATEGORY_MASK_ISO_8_1;
3102 single_shifting = 1;
3103 }
3104 if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_2])
3105 & CODING_ISO_FLAG_SINGLE_SHIFT)
3106 {
3107 found |= CATEGORY_MASK_ISO_8_2;
3108 single_shifting = 1;
3109 }
3110 if (single_shifting)
3111 break;
3112 check_extra_latin:
3113 if (! VECTORP (Vlatin_extra_code_table)
3114 || NILP (XVECTOR (Vlatin_extra_code_table)->contents[c]))
3115 {
3116 rejected = CATEGORY_MASK_ISO;
3117 break;
3118 }
3119 if (CODING_ISO_FLAGS (&coding_categories[coding_category_iso_8_1])
3120 & CODING_ISO_FLAG_LATIN_EXTRA)
3121 found |= CATEGORY_MASK_ISO_8_1;
3122 else
3123 rejected |= CATEGORY_MASK_ISO_8_1;
3124 rejected |= CATEGORY_MASK_ISO_8_2;
3125 break;
3126
3127 default:
3128 if (c < 0)
3129 continue;
3130 if (c < 0x80)
3131 {
3132 if (composition_count >= 0)
3133 composition_count++;
3134 single_shifting = 0;
3135 break;
3136 }
3137 if (c >= 0xA0)
3138 {
3139 rejected |= CATEGORY_MASK_ISO_7BIT | CATEGORY_MASK_ISO_7_ELSE;
3140 found |= CATEGORY_MASK_ISO_8_1;
3141 /* Check the length of succeeding codes of the range
3142 0xA0..0FF. If the byte length is even, we include
3143 CATEGORY_MASK_ISO_8_2 in `found'. We can check this
3144 only when we are not single shifting. */
3145 if (! single_shifting
3146 && ! (rejected & CATEGORY_MASK_ISO_8_2))
3147 {
3148 int len = 1;
3149 while (src < src_end)
3150 {
3151 src_base = src;
3152 ONE_MORE_BYTE (c);
3153 if (c < 0xA0)
3154 {
3155 src = src_base;
3156 break;
3157 }
3158 len++;
3159 }
3160
3161 if (len & 1 && src < src_end)
3162 {
3163 rejected |= CATEGORY_MASK_ISO_8_2;
3164 if (composition_count >= 0)
3165 composition_count += len;
3166 }
3167 else
3168 {
3169 found |= CATEGORY_MASK_ISO_8_2;
3170 if (composition_count >= 0)
3171 composition_count += len / 2;
3172 }
3173 }
3174 break;
3175 }
3176 }
3177 }
3178 detect_info->rejected |= CATEGORY_MASK_ISO;
3179 return 0;
3180
3181 no_more_source:
3182 detect_info->rejected |= rejected;
3183 detect_info->found |= (found & ~rejected);
3184 return 1;
3185 }
3186
3187
3188 /* Set designation state into CODING. Set CHARS_96 to -1 if the
3189 escape sequence should be kept. */
3190 #define DECODE_DESIGNATION(reg, dim, chars_96, final) \
3191 do { \
3192 int id, prev; \
3193 \
3194 if (final < '0' || final >= 128 \
3195 || ((id = ISO_CHARSET_TABLE (dim, chars_96, final)) < 0) \
3196 || !SAFE_CHARSET_P (coding, id)) \
3197 { \
3198 CODING_ISO_DESIGNATION (coding, reg) = -2; \
3199 chars_96 = -1; \
3200 break; \
3201 } \
3202 prev = CODING_ISO_DESIGNATION (coding, reg); \
3203 if (id == charset_jisx0201_roman) \
3204 { \
3205 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_USE_ROMAN) \
3206 id = charset_ascii; \
3207 } \
3208 else if (id == charset_jisx0208_1978) \
3209 { \
3210 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_USE_OLDJIS) \
3211 id = charset_jisx0208; \
3212 } \
3213 CODING_ISO_DESIGNATION (coding, reg) = id; \
3214 /* If there was an invalid designation to REG previously, and this \
3215 designation is ASCII to REG, we should keep this designation \
3216 sequence. */ \
3217 if (prev == -2 && id == charset_ascii) \
3218 chars_96 = -1; \
3219 } while (0)
3220
3221
3222 /* Handle these composition sequence (ALT: alternate char):
3223
3224 (1) relative composition: ESC 0 CHAR ... ESC 1
3225 (2) rulebase composition: ESC 2 CHAR RULE CHAR RULE ... CHAR ESC 1
3226 (3) altchar composition: ESC 3 ALT ... ALT ESC 0 CHAR ... ESC 1
3227 (4) alt&rule composition: ESC 4 ALT RULE ... ALT ESC 0 CHAR ... ESC 1
3228
3229 When the start sequence (ESC 0/2/3/4) is found, this annotation
3230 header is produced.
3231
3232 [ -LENGTH(==-5) CODING_ANNOTATE_COMPOSITION_MASK NCHARS(==0) 0 METHOD ]
3233
3234 Then, upon reading CHAR or RULE (one or two bytes), these codes are
3235 produced until the end sequence (ESC 1) is found:
3236
3237 (1) CHAR ... CHAR
3238 (2) CHAR -2 DECODED-RULE CHAR -2 DECODED-RULE ... CHAR
3239 (3) ALT ... ALT -1 -1 CHAR ... CHAR
3240 (4) ALT -2 DECODED-RULE ALT -2 DECODED-RULE ... ALT -1 -1 CHAR ... CHAR
3241
3242 When the end sequence (ESC 1) is found, LENGTH and NCHARS in the
3243 annotation header is updated as below:
3244
3245 (1) LENGTH: unchanged, NCHARS: number of CHARs
3246 (2) LENGTH: unchanged, NCHARS: number of CHARs
3247 (3) LENGTH: += number of ALTs + 2, NCHARS: number of CHARs
3248 (4) LENGTH: += number of ALTs * 3, NCHARS: number of CHARs
3249
3250 If an error is found while composing, the annotation header is
3251 changed to:
3252
3253 [ ESC '0'/'2'/'3'/'4' -2 0 ]
3254
3255 and the sequence [ -2 DECODED-RULE ] is changed to the original
3256 byte sequence as below:
3257 o the original byte sequence is B: [ B -1 ]
3258 o the original byte sequence is B1 B2: [ B1 B2 ]
3259 and the sequence [ -1 -1 ] is changed to the original byte
3260 sequence:
3261 [ ESC '0' ]
3262 */
3263
3264 /* Decode a composition rule C1 and maybe one more byte from the
3265 source, and set RULE to the encoded composition rule. If the rule
3266 is invalid, goto invalid_code. */
3267
3268 #define DECODE_COMPOSITION_RULE(rule) \
3269 do { \
3270 rule = c1 - 32; \
3271 if (rule < 0) \
3272 goto invalid_code; \
3273 if (rule < 81) /* old format (before ver.21) */ \
3274 { \
3275 int gref = (rule) / 9; \
3276 int nref = (rule) % 9; \
3277 if (gref == 4) gref = 10; \
3278 if (nref == 4) nref = 10; \
3279 rule = COMPOSITION_ENCODE_RULE (gref, nref); \
3280 } \
3281 else /* new format (after ver.21) */ \
3282 { \
3283 int b; \
3284 \
3285 ONE_MORE_BYTE (b); \
3286 if (! COMPOSITION_ENCODE_RULE_VALID (rule - 81, b - 32)) \
3287 goto invalid_code; \
3288 rule = COMPOSITION_ENCODE_RULE (rule - 81, b - 32); \
3289 rule += 0x100; /* Distinguish it from the old format. */ \
3290 } \
3291 } while (0)
3292
3293 #define ENCODE_COMPOSITION_RULE(rule) \
3294 do { \
3295 int gref = (rule % 0x100) / 12, nref = (rule % 0x100) % 12; \
3296 \
3297 if (rule < 0x100) /* old format */ \
3298 { \
3299 if (gref == 10) gref = 4; \
3300 if (nref == 10) nref = 4; \
3301 charbuf[idx] = 32 + gref * 9 + nref; \
3302 charbuf[idx + 1] = -1; \
3303 new_chars++; \
3304 } \
3305 else /* new format */ \
3306 { \
3307 charbuf[idx] = 32 + 81 + gref; \
3308 charbuf[idx + 1] = 32 + nref; \
3309 new_chars += 2; \
3310 } \
3311 } while (0)
3312
3313 /* Finish the current composition as invalid. */
3314
3315 static int finish_composition (int *, struct composition_status *);
3316
3317 static int
3318 finish_composition (int *charbuf, struct composition_status *cmp_status)
3319 {
3320 int idx = - cmp_status->length;
3321 int new_chars;
3322
3323 /* Recover the original ESC sequence */
3324 charbuf[idx++] = ISO_CODE_ESC;
3325 charbuf[idx++] = (cmp_status->method == COMPOSITION_RELATIVE ? '0'
3326 : cmp_status->method == COMPOSITION_WITH_RULE ? '2'
3327 : cmp_status->method == COMPOSITION_WITH_ALTCHARS ? '3'
3328 /* cmp_status->method == COMPOSITION_WITH_RULE_ALTCHARS */
3329 : '4');
3330 charbuf[idx++] = -2;
3331 charbuf[idx++] = 0;
3332 charbuf[idx++] = -1;
3333 new_chars = cmp_status->nchars;
3334 if (cmp_status->method >= COMPOSITION_WITH_RULE)
3335 for (; idx < 0; idx++)
3336 {
3337 int elt = charbuf[idx];
3338
3339 if (elt == -2)
3340 {
3341 ENCODE_COMPOSITION_RULE (charbuf[idx + 1]);
3342 idx++;
3343 }
3344 else if (elt == -1)
3345 {
3346 charbuf[idx++] = ISO_CODE_ESC;
3347 charbuf[idx] = '0';
3348 new_chars += 2;
3349 }
3350 }
3351 cmp_status->state = COMPOSING_NO;
3352 return new_chars;
3353 }
3354
3355 /* If characters are under composition, finish the composition. */
3356 #define MAYBE_FINISH_COMPOSITION() \
3357 do { \
3358 if (cmp_status->state != COMPOSING_NO) \
3359 char_offset += finish_composition (charbuf, cmp_status); \
3360 } while (0)
3361
3362 /* Handle composition start sequence ESC 0, ESC 2, ESC 3, or ESC 4.
3363
3364 ESC 0 : relative composition : ESC 0 CHAR ... ESC 1
3365 ESC 2 : rulebase composition : ESC 2 CHAR RULE CHAR RULE ... CHAR ESC 1
3366 ESC 3 : altchar composition : ESC 3 CHAR ... ESC 0 CHAR ... ESC 1
3367 ESC 4 : alt&rule composition : ESC 4 CHAR RULE ... CHAR ESC 0 CHAR ... ESC 1
3368
3369 Produce this annotation sequence now:
3370
3371 [ -LENGTH(==-4) CODING_ANNOTATE_COMPOSITION_MASK NCHARS(==0) METHOD ]
3372 */
3373
3374 #define DECODE_COMPOSITION_START(c1) \
3375 do { \
3376 if (c1 == '0' \
3377 && ((cmp_status->state == COMPOSING_COMPONENT_CHAR \
3378 && cmp_status->method == COMPOSITION_WITH_ALTCHARS) \
3379 || (cmp_status->state == COMPOSING_COMPONENT_RULE \
3380 && cmp_status->method == COMPOSITION_WITH_RULE_ALTCHARS))) \
3381 { \
3382 *charbuf++ = -1; \
3383 *charbuf++= -1; \
3384 cmp_status->state = COMPOSING_CHAR; \
3385 cmp_status->length += 2; \
3386 } \
3387 else \
3388 { \
3389 MAYBE_FINISH_COMPOSITION (); \
3390 cmp_status->method = (c1 == '0' ? COMPOSITION_RELATIVE \
3391 : c1 == '2' ? COMPOSITION_WITH_RULE \
3392 : c1 == '3' ? COMPOSITION_WITH_ALTCHARS \
3393 : COMPOSITION_WITH_RULE_ALTCHARS); \
3394 cmp_status->state \
3395 = (c1 <= '2' ? COMPOSING_CHAR : COMPOSING_COMPONENT_CHAR); \
3396 ADD_COMPOSITION_DATA (charbuf, 0, 0, cmp_status->method); \
3397 cmp_status->length = MAX_ANNOTATION_LENGTH; \
3398 cmp_status->nchars = cmp_status->ncomps = 0; \
3399 coding->annotated = 1; \
3400 } \
3401 } while (0)
3402
3403
3404 /* Handle composition end sequence ESC 1. */
3405
3406 #define DECODE_COMPOSITION_END() \
3407 do { \
3408 if (cmp_status->nchars == 0 \
3409 || ((cmp_status->state == COMPOSING_CHAR) \
3410 == (cmp_status->method == COMPOSITION_WITH_RULE))) \
3411 { \
3412 MAYBE_FINISH_COMPOSITION (); \
3413 goto invalid_code; \
3414 } \
3415 if (cmp_status->method == COMPOSITION_WITH_ALTCHARS) \
3416 charbuf[- cmp_status->length] -= cmp_status->ncomps + 2; \
3417 else if (cmp_status->method == COMPOSITION_WITH_RULE_ALTCHARS) \
3418 charbuf[- cmp_status->length] -= cmp_status->ncomps * 3; \
3419 charbuf[- cmp_status->length + 2] = cmp_status->nchars; \
3420 char_offset += cmp_status->nchars; \
3421 cmp_status->state = COMPOSING_NO; \
3422 } while (0)
3423
3424 /* Store a composition rule RULE in charbuf, and update cmp_status. */
3425
3426 #define STORE_COMPOSITION_RULE(rule) \
3427 do { \
3428 *charbuf++ = -2; \
3429 *charbuf++ = rule; \
3430 cmp_status->length += 2; \
3431 cmp_status->state--; \
3432 } while (0)
3433
3434 /* Store a composed char or a component char C in charbuf, and update
3435 cmp_status. */
3436
3437 #define STORE_COMPOSITION_CHAR(c) \
3438 do { \
3439 *charbuf++ = (c); \
3440 cmp_status->length++; \
3441 if (cmp_status->state == COMPOSING_CHAR) \
3442 cmp_status->nchars++; \
3443 else \
3444 cmp_status->ncomps++; \
3445 if (cmp_status->method == COMPOSITION_WITH_RULE \
3446 || (cmp_status->method == COMPOSITION_WITH_RULE_ALTCHARS \
3447 && cmp_status->state == COMPOSING_COMPONENT_CHAR)) \
3448 cmp_status->state++; \
3449 } while (0)
3450
3451
3452 /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". */
3453
3454 static void
3455 decode_coding_iso_2022 (struct coding_system *coding)
3456 {
3457 const unsigned char *src = coding->source + coding->consumed;
3458 const unsigned char *src_end = coding->source + coding->src_bytes;
3459 const unsigned char *src_base;
3460 int *charbuf = coding->charbuf + coding->charbuf_used;
3461 /* We may produce two annotations (charset and composition) in one
3462 loop and one more charset annotation at the end. */
3463 int *charbuf_end
3464 = coding->charbuf + coding->charbuf_size - (MAX_ANNOTATION_LENGTH * 3);
3465 EMACS_INT consumed_chars = 0, consumed_chars_base;
3466 int multibytep = coding->src_multibyte;
3467 /* Charsets invoked to graphic plane 0 and 1 respectively. */
3468 int charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0);
3469 int charset_id_1 = CODING_ISO_INVOKED_CHARSET (coding, 1);
3470 int charset_id_2, charset_id_3;
3471 struct charset *charset;
3472 int c;
3473 struct composition_status *cmp_status = CODING_ISO_CMP_STATUS (coding);
3474 Lisp_Object attrs = CODING_ID_ATTRS (coding->id);
3475 EMACS_INT char_offset = coding->produced_char;
3476 EMACS_INT last_offset = char_offset;
3477 int last_id = charset_ascii;
3478 int eol_dos =
3479 !inhibit_eol_conversion && EQ (CODING_ID_EOL_TYPE (coding->id), Qdos);
3480 int byte_after_cr = -1;
3481 int i;
3482
3483 setup_iso_safe_charsets (attrs);
3484 coding->safe_charsets = SDATA (CODING_ATTR_SAFE_CHARSETS (attrs));
3485
3486 if (cmp_status->state != COMPOSING_NO)
3487 {
3488 if (charbuf_end - charbuf < cmp_status->length)
3489 abort ();
3490 for (i = 0; i < cmp_status->length; i++)
3491 *charbuf++ = cmp_status->carryover[i];
3492 coding->annotated = 1;
3493 }
3494
3495 while (1)
3496 {
3497 int c1, c2, c3;
3498
3499 src_base = src;
3500 consumed_chars_base = consumed_chars;
3501
3502 if (charbuf >= charbuf_end)
3503 {
3504 if (byte_after_cr >= 0)
3505 src_base--;
3506 break;
3507 }
3508
3509 if (byte_after_cr >= 0)
3510 c1 = byte_after_cr, byte_after_cr = -1;
3511 else
3512 ONE_MORE_BYTE (c1);
3513 if (c1 < 0)
3514 goto invalid_code;
3515
3516 if (CODING_ISO_EXTSEGMENT_LEN (coding) > 0)
3517 {
3518 *charbuf++ = ASCII_BYTE_P (c1) ? c1 : BYTE8_TO_CHAR (c1);
3519 char_offset++;
3520 CODING_ISO_EXTSEGMENT_LEN (coding)--;
3521 continue;
3522 }
3523
3524 if (CODING_ISO_EMBEDDED_UTF_8 (coding))
3525 {
3526 if (c1 == ISO_CODE_ESC)
3527 {
3528 if (src + 1 >= src_end)
3529 goto no_more_source;
3530 *charbuf++ = ISO_CODE_ESC;
3531 char_offset++;
3532 if (src[0] == '%' && src[1] == '@')
3533 {
3534 src += 2;
3535 consumed_chars += 2;
3536 char_offset += 2;
3537 /* We are sure charbuf can contain two more chars. */
3538 *charbuf++ = '%';
3539 *charbuf++ = '@';
3540 CODING_ISO_EMBEDDED_UTF_8 (coding) = 0;
3541 }
3542 }
3543 else
3544 {
3545 *charbuf++ = ASCII_BYTE_P (c1) ? c1 : BYTE8_TO_CHAR (c1);
3546 char_offset++;
3547 }
3548 continue;
3549 }
3550
3551 if ((cmp_status->state == COMPOSING_RULE
3552 || cmp_status->state == COMPOSING_COMPONENT_RULE)
3553 && c1 != ISO_CODE_ESC)
3554 {
3555 int rule;
3556
3557 DECODE_COMPOSITION_RULE (rule);
3558 STORE_COMPOSITION_RULE (rule);
3559 continue;
3560 }
3561
3562 /* We produce at most one character. */
3563 switch (iso_code_class [c1])
3564 {
3565 case ISO_0x20_or_0x7F:
3566 if (charset_id_0 < 0
3567 || ! CHARSET_ISO_CHARS_96 (CHARSET_FROM_ID (charset_id_0)))
3568 /* This is SPACE or DEL. */
3569 charset = CHARSET_FROM_ID (charset_ascii);
3570 else
3571 charset = CHARSET_FROM_ID (charset_id_0);
3572 break;
3573
3574 case ISO_graphic_plane_0:
3575 if (charset_id_0 < 0)
3576 charset = CHARSET_FROM_ID (charset_ascii);
3577 else
3578 charset = CHARSET_FROM_ID (charset_id_0);
3579 break;
3580
3581 case ISO_0xA0_or_0xFF:
3582 if (charset_id_1 < 0
3583 || ! CHARSET_ISO_CHARS_96 (CHARSET_FROM_ID (charset_id_1))
3584 || CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS)
3585 goto invalid_code;
3586 /* This is a graphic character, we fall down ... */
3587
3588 case ISO_graphic_plane_1:
3589 if (charset_id_1 < 0)
3590 goto invalid_code;
3591 charset = CHARSET_FROM_ID (charset_id_1);
3592 break;
3593
3594 case ISO_control_0:
3595 if (eol_dos && c1 == '\r')
3596 ONE_MORE_BYTE (byte_after_cr);
3597 MAYBE_FINISH_COMPOSITION ();
3598 charset = CHARSET_FROM_ID (charset_ascii);
3599 break;
3600
3601 case ISO_control_1:
3602 goto invalid_code;
3603
3604 case ISO_shift_out:
3605 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LOCKING_SHIFT)
3606 || CODING_ISO_DESIGNATION (coding, 1) < 0)
3607 goto invalid_code;
3608 CODING_ISO_INVOCATION (coding, 0) = 1;
3609 charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0);
3610 continue;
3611
3612 case ISO_shift_in:
3613 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LOCKING_SHIFT))
3614 goto invalid_code;
3615 CODING_ISO_INVOCATION (coding, 0) = 0;
3616 charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0);
3617 continue;
3618
3619 case ISO_single_shift_2_7:
3620 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS))
3621 goto invalid_code;
3622 case ISO_single_shift_2:
3623 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT))
3624 goto invalid_code;
3625 /* SS2 is handled as an escape sequence of ESC 'N' */
3626 c1 = 'N';
3627 goto label_escape_sequence;
3628
3629 case ISO_single_shift_3:
3630 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT))
3631 goto invalid_code;
3632 /* SS2 is handled as an escape sequence of ESC 'O' */
3633 c1 = 'O';
3634 goto label_escape_sequence;
3635
3636 case ISO_control_sequence_introducer:
3637 /* CSI is handled as an escape sequence of ESC '[' ... */
3638 c1 = '[';
3639 goto label_escape_sequence;
3640
3641 case ISO_escape:
3642 ONE_MORE_BYTE (c1);
3643 label_escape_sequence:
3644 /* Escape sequences handled here are invocation,
3645 designation, direction specification, and character
3646 composition specification. */
3647 switch (c1)
3648 {
3649 case '&': /* revision of following character set */
3650 ONE_MORE_BYTE (c1);
3651 if (!(c1 >= '@' && c1 <= '~'))
3652 goto invalid_code;
3653 ONE_MORE_BYTE (c1);
3654 if (c1 != ISO_CODE_ESC)
3655 goto invalid_code;
3656 ONE_MORE_BYTE (c1);
3657 goto label_escape_sequence;
3658
3659 case '$': /* designation of 2-byte character set */
3660 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DESIGNATION))
3661 goto invalid_code;
3662 {
3663 int reg, chars96;
3664
3665 ONE_MORE_BYTE (c1);
3666 if (c1 >= '@' && c1 <= 'B')
3667 { /* designation of JISX0208.1978, GB2312.1980,
3668 or JISX0208.1980 */
3669 reg = 0, chars96 = 0;
3670 }
3671 else if (c1 >= 0x28 && c1 <= 0x2B)
3672 { /* designation of DIMENSION2_CHARS94 character set */
3673 reg = c1 - 0x28, chars96 = 0;
3674 ONE_MORE_BYTE (c1);
3675 }
3676 else if (c1 >= 0x2C && c1 <= 0x2F)
3677 { /* designation of DIMENSION2_CHARS96 character set */
3678 reg = c1 - 0x2C, chars96 = 1;
3679 ONE_MORE_BYTE (c1);
3680 }
3681 else
3682 goto invalid_code;
3683 DECODE_DESIGNATION (reg, 2, chars96, c1);
3684 /* We must update these variables now. */
3685 if (reg == 0)
3686 charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0);
3687 else if (reg == 1)
3688 charset_id_1 = CODING_ISO_INVOKED_CHARSET (coding, 1);
3689 if (chars96 < 0)
3690 goto invalid_code;
3691 }
3692 continue;
3693
3694 case 'n': /* invocation of locking-shift-2 */
3695 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LOCKING_SHIFT)
3696 || CODING_ISO_DESIGNATION (coding, 2) < 0)
3697 goto invalid_code;
3698 CODING_ISO_INVOCATION (coding, 0) = 2;
3699 charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0);
3700 continue;
3701
3702 case 'o': /* invocation of locking-shift-3 */
3703 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LOCKING_SHIFT)
3704 || CODING_ISO_DESIGNATION (coding, 3) < 0)
3705 goto invalid_code;
3706 CODING_ISO_INVOCATION (coding, 0) = 3;
3707 charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0);
3708 continue;
3709
3710 case 'N': /* invocation of single-shift-2 */
3711 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT)
3712 || CODING_ISO_DESIGNATION (coding, 2) < 0)
3713 goto invalid_code;
3714 charset_id_2 = CODING_ISO_DESIGNATION (coding, 2);
3715 if (charset_id_2 < 0)
3716 charset = CHARSET_FROM_ID (charset_ascii);
3717 else
3718 charset = CHARSET_FROM_ID (charset_id_2);
3719 ONE_MORE_BYTE (c1);
3720 if (c1 < 0x20 || (c1 >= 0x80 && c1 < 0xA0))
3721 goto invalid_code;
3722 break;
3723
3724 case 'O': /* invocation of single-shift-3 */
3725 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT)
3726 || CODING_ISO_DESIGNATION (coding, 3) < 0)
3727 goto invalid_code;
3728 charset_id_3 = CODING_ISO_DESIGNATION (coding, 3);
3729 if (charset_id_3 < 0)
3730 charset = CHARSET_FROM_ID (charset_ascii);
3731 else
3732 charset = CHARSET_FROM_ID (charset_id_3);
3733 ONE_MORE_BYTE (c1);
3734 if (c1 < 0x20 || (c1 >= 0x80 && c1 < 0xA0))
3735 goto invalid_code;
3736 break;
3737
3738 case '0': case '2': case '3': case '4': /* start composition */
3739 if (! (coding->common_flags & CODING_ANNOTATE_COMPOSITION_MASK))
3740 goto invalid_code;
3741 if (last_id != charset_ascii)
3742 {
3743 ADD_CHARSET_DATA (charbuf, char_offset- last_offset, last_id);
3744 last_id = charset_ascii;
3745 last_offset = char_offset;
3746 }
3747 DECODE_COMPOSITION_START (c1);
3748 continue;
3749
3750 case '1': /* end composition */
3751 if (cmp_status->state == COMPOSING_NO)
3752 goto invalid_code;
3753 DECODE_COMPOSITION_END ();
3754 continue;
3755
3756 case '[': /* specification of direction */
3757 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DIRECTION))
3758 goto invalid_code;
3759 /* For the moment, nested direction is not supported.
3760 So, `coding->mode & CODING_MODE_DIRECTION' zero means
3761 left-to-right, and nonzero means right-to-left. */
3762 ONE_MORE_BYTE (c1);
3763 switch (c1)
3764 {
3765 case ']': /* end of the current direction */
3766 coding->mode &= ~CODING_MODE_DIRECTION;
3767
3768 case '0': /* end of the current direction */
3769 case '1': /* start of left-to-right direction */
3770 ONE_MORE_BYTE (c1);
3771 if (c1 == ']')
3772 coding->mode &= ~CODING_MODE_DIRECTION;
3773 else
3774 goto invalid_code;
3775 break;
3776
3777 case '2': /* start of right-to-left direction */
3778 ONE_MORE_BYTE (c1);
3779 if (c1 == ']')
3780 coding->mode |= CODING_MODE_DIRECTION;
3781 else
3782 goto invalid_code;
3783 break;
3784
3785 default:
3786 goto invalid_code;
3787 }
3788 continue;
3789
3790 case '%':
3791 ONE_MORE_BYTE (c1);
3792 if (c1 == '/')
3793 {
3794 /* CTEXT extended segment:
3795 ESC % / [0-4] M L --ENCODING-NAME-- \002 --BYTES--
3796 We keep these bytes as is for the moment.
3797 They may be decoded by post-read-conversion. */
3798 int dim, M, L;
3799 int size;
3800
3801 ONE_MORE_BYTE (dim);
3802 if (dim < '0' || dim > '4')
3803 goto invalid_code;
3804 ONE_MORE_BYTE (M);
3805 if (M < 128)
3806 goto invalid_code;
3807 ONE_MORE_BYTE (L);
3808 if (L < 128)
3809 goto invalid_code;
3810 size = ((M - 128) * 128) + (L - 128);
3811 if (charbuf + 6 > charbuf_end)
3812 goto break_loop;
3813 *charbuf++ = ISO_CODE_ESC;
3814 *charbuf++ = '%';
3815 *charbuf++ = '/';
3816 *charbuf++ = dim;
3817 *charbuf++ = BYTE8_TO_CHAR (M);
3818 *charbuf++ = BYTE8_TO_CHAR (L);
3819 CODING_ISO_EXTSEGMENT_LEN (coding) = size;
3820 }
3821 else if (c1 == 'G')
3822 {
3823 /* XFree86 extension for embedding UTF-8 in CTEXT:
3824 ESC % G --UTF-8-BYTES-- ESC % @
3825 We keep these bytes as is for the moment.
3826 They may be decoded by post-read-conversion. */
3827 if (charbuf + 3 > charbuf_end)
3828 goto break_loop;
3829 *charbuf++ = ISO_CODE_ESC;
3830 *charbuf++ = '%';
3831 *charbuf++ = 'G';
3832 CODING_ISO_EMBEDDED_UTF_8 (coding) = 1;
3833 }
3834 else
3835 goto invalid_code;
3836 continue;
3837 break;
3838
3839 default:
3840 if (! (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DESIGNATION))
3841 goto invalid_code;
3842 {
3843 int reg, chars96;
3844
3845 if (c1 >= 0x28 && c1 <= 0x2B)
3846 { /* designation of DIMENSION1_CHARS94 character set */
3847 reg = c1 - 0x28, chars96 = 0;
3848 ONE_MORE_BYTE (c1);
3849 }
3850 else if (c1 >= 0x2C && c1 <= 0x2F)
3851 { /* designation of DIMENSION1_CHARS96 character set */
3852 reg = c1 - 0x2C, chars96 = 1;
3853 ONE_MORE_BYTE (c1);
3854 }
3855 else
3856 goto invalid_code;
3857 DECODE_DESIGNATION (reg, 1, chars96, c1);
3858 /* We must update these variables now. */
3859 if (reg == 0)
3860 charset_id_0 = CODING_ISO_INVOKED_CHARSET (coding, 0);
3861 else if (reg == 1)
3862 charset_id_1 = CODING_ISO_INVOKED_CHARSET (coding, 1);
3863 if (chars96 < 0)
3864 goto invalid_code;
3865 }
3866 continue;
3867 }
3868 break;
3869
3870 default:
3871 abort ();
3872 }
3873
3874 if (cmp_status->state == COMPOSING_NO
3875 && charset->id != charset_ascii
3876 && last_id != charset->id)
3877 {
3878 if (last_id != charset_ascii)
3879 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
3880 last_id = charset->id;
3881 last_offset = char_offset;
3882 }
3883
3884 /* Now we know CHARSET and 1st position code C1 of a character.
3885 Produce a decoded character while getting 2nd and 3rd
3886 position codes C2, C3 if necessary. */
3887 if (CHARSET_DIMENSION (charset) > 1)
3888 {
3889 ONE_MORE_BYTE (c2);
3890 if (c2 < 0x20 || (c2 >= 0x80 && c2 < 0xA0)
3891 || ((c1 & 0x80) != (c2 & 0x80)))
3892 /* C2 is not in a valid range. */
3893 goto invalid_code;
3894 if (CHARSET_DIMENSION (charset) == 2)
3895 c1 = (c1 << 8) | c2;
3896 else
3897 {
3898 ONE_MORE_BYTE (c3);
3899 if (c3 < 0x20 || (c3 >= 0x80 && c3 < 0xA0)
3900 || ((c1 & 0x80) != (c3 & 0x80)))
3901 /* C3 is not in a valid range. */
3902 goto invalid_code;
3903 c1 = (c1 << 16) | (c2 << 8) | c2;
3904 }
3905 }
3906 c1 &= 0x7F7F7F;
3907 CODING_DECODE_CHAR (coding, src, src_base, src_end, charset, c1, c);
3908 if (c < 0)
3909 {
3910 MAYBE_FINISH_COMPOSITION ();
3911 for (; src_base < src; src_base++, char_offset++)
3912 {
3913 if (ASCII_BYTE_P (*src_base))
3914 *charbuf++ = *src_base;
3915 else
3916 *charbuf++ = BYTE8_TO_CHAR (*src_base);
3917 }
3918 }
3919 else if (cmp_status->state == COMPOSING_NO)
3920 {
3921 *charbuf++ = c;
3922 char_offset++;
3923 }
3924 else if ((cmp_status->state == COMPOSING_CHAR
3925 ? cmp_status->nchars
3926 : cmp_status->ncomps)
3927 >= MAX_COMPOSITION_COMPONENTS)
3928 {
3929 /* Too long composition. */
3930 MAYBE_FINISH_COMPOSITION ();
3931 *charbuf++ = c;
3932 char_offset++;
3933 }
3934 else
3935 STORE_COMPOSITION_CHAR (c);
3936 continue;
3937
3938 invalid_code:
3939 MAYBE_FINISH_COMPOSITION ();
3940 src = src_base;
3941 consumed_chars = consumed_chars_base;
3942 ONE_MORE_BYTE (c);
3943 *charbuf++ = c < 0 ? -c : ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c);
3944 char_offset++;
3945 coding->errors++;
3946 continue;
3947
3948 break_loop:
3949 break;
3950 }
3951
3952 no_more_source:
3953 if (cmp_status->state != COMPOSING_NO)
3954 {
3955 if (coding->mode & CODING_MODE_LAST_BLOCK)
3956 MAYBE_FINISH_COMPOSITION ();
3957 else
3958 {
3959 charbuf -= cmp_status->length;
3960 for (i = 0; i < cmp_status->length; i++)
3961 cmp_status->carryover[i] = charbuf[i];
3962 }
3963 }
3964 else if (last_id != charset_ascii)
3965 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
3966 coding->consumed_char += consumed_chars_base;
3967 coding->consumed = src_base - coding->source;
3968 coding->charbuf_used = charbuf - coding->charbuf;
3969 }
3970
3971
3972 /* ISO2022 encoding stuff. */
3973
3974 /*
3975 It is not enough to say just "ISO2022" on encoding, we have to
3976 specify more details. In Emacs, each coding system of ISO2022
3977 variant has the following specifications:
3978 1. Initial designation to G0 thru G3.
3979 2. Allows short-form designation?
3980 3. ASCII should be designated to G0 before control characters?
3981 4. ASCII should be designated to G0 at end of line?
3982 5. 7-bit environment or 8-bit environment?
3983 6. Use locking-shift?
3984 7. Use Single-shift?
3985 And the following two are only for Japanese:
3986 8. Use ASCII in place of JIS0201-1976-Roman?
3987 9. Use JISX0208-1983 in place of JISX0208-1978?
3988 These specifications are encoded in CODING_ISO_FLAGS (coding) as flag bits
3989 defined by macros CODING_ISO_FLAG_XXX. See `coding.h' for more
3990 details.
3991 */
3992
3993 /* Produce codes (escape sequence) for designating CHARSET to graphic
3994 register REG at DST, and increment DST. If <final-char> of CHARSET is
3995 '@', 'A', or 'B' and the coding system CODING allows, produce
3996 designation sequence of short-form. */
3997
3998 #define ENCODE_DESIGNATION(charset, reg, coding) \
3999 do { \
4000 unsigned char final_char = CHARSET_ISO_FINAL (charset); \
4001 const char *intermediate_char_94 = "()*+"; \
4002 const char *intermediate_char_96 = ",-./"; \
4003 int revision = -1; \
4004 \
4005 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_REVISION) \
4006 revision = CHARSET_ISO_REVISION (charset); \
4007 \
4008 if (revision >= 0) \
4009 { \
4010 EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, '&'); \
4011 EMIT_ONE_BYTE ('@' + revision); \
4012 } \
4013 EMIT_ONE_ASCII_BYTE (ISO_CODE_ESC); \
4014 if (CHARSET_DIMENSION (charset) == 1) \
4015 { \
4016 int b; \
4017 if (! CHARSET_ISO_CHARS_96 (charset)) \
4018 b = intermediate_char_94[reg]; \
4019 else \
4020 b = intermediate_char_96[reg]; \
4021 EMIT_ONE_ASCII_BYTE (b); \
4022 } \
4023 else \
4024 { \
4025 EMIT_ONE_ASCII_BYTE ('$'); \
4026 if (! CHARSET_ISO_CHARS_96 (charset)) \
4027 { \
4028 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_LONG_FORM \
4029 || reg != 0 \
4030 || final_char < '@' || final_char > 'B') \
4031 EMIT_ONE_ASCII_BYTE (intermediate_char_94[reg]); \
4032 } \
4033 else \
4034 EMIT_ONE_ASCII_BYTE (intermediate_char_96[reg]); \
4035 } \
4036 EMIT_ONE_ASCII_BYTE (final_char); \
4037 \
4038 CODING_ISO_DESIGNATION (coding, reg) = CHARSET_ID (charset); \
4039 } while (0)
4040
4041
4042 /* The following two macros produce codes (control character or escape
4043 sequence) for ISO2022 single-shift functions (single-shift-2 and
4044 single-shift-3). */
4045
4046 #define ENCODE_SINGLE_SHIFT_2 \
4047 do { \
4048 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) \
4049 EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, 'N'); \
4050 else \
4051 EMIT_ONE_BYTE (ISO_CODE_SS2); \
4052 CODING_ISO_SINGLE_SHIFTING (coding) = 1; \
4053 } while (0)
4054
4055
4056 #define ENCODE_SINGLE_SHIFT_3 \
4057 do { \
4058 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) \
4059 EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, 'O'); \
4060 else \
4061 EMIT_ONE_BYTE (ISO_CODE_SS3); \
4062 CODING_ISO_SINGLE_SHIFTING (coding) = 1; \
4063 } while (0)
4064
4065
4066 /* The following four macros produce codes (control character or
4067 escape sequence) for ISO2022 locking-shift functions (shift-in,
4068 shift-out, locking-shift-2, and locking-shift-3). */
4069
4070 #define ENCODE_SHIFT_IN \
4071 do { \
4072 EMIT_ONE_ASCII_BYTE (ISO_CODE_SI); \
4073 CODING_ISO_INVOCATION (coding, 0) = 0; \
4074 } while (0)
4075
4076
4077 #define ENCODE_SHIFT_OUT \
4078 do { \
4079 EMIT_ONE_ASCII_BYTE (ISO_CODE_SO); \
4080 CODING_ISO_INVOCATION (coding, 0) = 1; \
4081 } while (0)
4082
4083
4084 #define ENCODE_LOCKING_SHIFT_2 \
4085 do { \
4086 EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, 'n'); \
4087 CODING_ISO_INVOCATION (coding, 0) = 2; \
4088 } while (0)
4089
4090
4091 #define ENCODE_LOCKING_SHIFT_3 \
4092 do { \
4093 EMIT_TWO_ASCII_BYTES (ISO_CODE_ESC, 'n'); \
4094 CODING_ISO_INVOCATION (coding, 0) = 3; \
4095 } while (0)
4096
4097
4098 /* Produce codes for a DIMENSION1 character whose character set is
4099 CHARSET and whose position-code is C1. Designation and invocation
4100 sequences are also produced in advance if necessary. */
4101
4102 #define ENCODE_ISO_CHARACTER_DIMENSION1(charset, c1) \
4103 do { \
4104 int id = CHARSET_ID (charset); \
4105 \
4106 if ((CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_USE_ROMAN) \
4107 && id == charset_ascii) \
4108 { \
4109 id = charset_jisx0201_roman; \
4110 charset = CHARSET_FROM_ID (id); \
4111 } \
4112 \
4113 if (CODING_ISO_SINGLE_SHIFTING (coding)) \
4114 { \
4115 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) \
4116 EMIT_ONE_ASCII_BYTE (c1 & 0x7F); \
4117 else \
4118 EMIT_ONE_BYTE (c1 | 0x80); \
4119 CODING_ISO_SINGLE_SHIFTING (coding) = 0; \
4120 break; \
4121 } \
4122 else if (id == CODING_ISO_INVOKED_CHARSET (coding, 0)) \
4123 { \
4124 EMIT_ONE_ASCII_BYTE (c1 & 0x7F); \
4125 break; \
4126 } \
4127 else if (id == CODING_ISO_INVOKED_CHARSET (coding, 1)) \
4128 { \
4129 EMIT_ONE_BYTE (c1 | 0x80); \
4130 break; \
4131 } \
4132 else \
4133 /* Since CHARSET is not yet invoked to any graphic planes, we \
4134 must invoke it, or, at first, designate it to some graphic \
4135 register. Then repeat the loop to actually produce the \
4136 character. */ \
4137 dst = encode_invocation_designation (charset, coding, dst, \
4138 &produced_chars); \
4139 } while (1)
4140
4141
4142 /* Produce codes for a DIMENSION2 character whose character set is
4143 CHARSET and whose position-codes are C1 and C2. Designation and
4144 invocation codes are also produced in advance if necessary. */
4145
4146 #define ENCODE_ISO_CHARACTER_DIMENSION2(charset, c1, c2) \
4147 do { \
4148 int id = CHARSET_ID (charset); \
4149 \
4150 if ((CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_USE_OLDJIS) \
4151 && id == charset_jisx0208) \
4152 { \
4153 id = charset_jisx0208_1978; \
4154 charset = CHARSET_FROM_ID (id); \
4155 } \
4156 \
4157 if (CODING_ISO_SINGLE_SHIFTING (coding)) \
4158 { \
4159 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SEVEN_BITS) \
4160 EMIT_TWO_ASCII_BYTES ((c1) & 0x7F, (c2) & 0x7F); \
4161 else \
4162 EMIT_TWO_BYTES ((c1) | 0x80, (c2) | 0x80); \
4163 CODING_ISO_SINGLE_SHIFTING (coding) = 0; \
4164 break; \
4165 } \
4166 else if (id == CODING_ISO_INVOKED_CHARSET (coding, 0)) \
4167 { \
4168 EMIT_TWO_ASCII_BYTES ((c1) & 0x7F, (c2) & 0x7F); \
4169 break; \
4170 } \
4171 else if (id == CODING_ISO_INVOKED_CHARSET (coding, 1)) \
4172 { \
4173 EMIT_TWO_BYTES ((c1) | 0x80, (c2) | 0x80); \
4174 break; \
4175 } \
4176 else \
4177 /* Since CHARSET is not yet invoked to any graphic planes, we \
4178 must invoke it, or, at first, designate it to some graphic \
4179 register. Then repeat the loop to actually produce the \
4180 character. */ \
4181 dst = encode_invocation_designation (charset, coding, dst, \
4182 &produced_chars); \
4183 } while (1)
4184
4185
4186 #define ENCODE_ISO_CHARACTER(charset, c) \
4187 do { \
4188 int code = ENCODE_CHAR ((charset), (c)); \
4189 \
4190 if (CHARSET_DIMENSION (charset) == 1) \
4191 ENCODE_ISO_CHARACTER_DIMENSION1 ((charset), code); \
4192 else \
4193 ENCODE_ISO_CHARACTER_DIMENSION2 ((charset), code >> 8, code & 0xFF); \
4194 } while (0)
4195
4196
4197 /* Produce designation and invocation codes at a place pointed by DST
4198 to use CHARSET. The element `spec.iso_2022' of *CODING is updated.
4199 Return new DST. */
4200
4201 static unsigned char *
4202 encode_invocation_designation (struct charset *charset,
4203 struct coding_system *coding,
4204 unsigned char *dst, EMACS_INT *p_nchars)
4205 {
4206 int multibytep = coding->dst_multibyte;
4207 EMACS_INT produced_chars = *p_nchars;
4208 int reg; /* graphic register number */
4209 int id = CHARSET_ID (charset);
4210
4211 /* At first, check designations. */
4212 for (reg = 0; reg < 4; reg++)
4213 if (id == CODING_ISO_DESIGNATION (coding, reg))
4214 break;
4215
4216 if (reg >= 4)
4217 {
4218 /* CHARSET is not yet designated to any graphic registers. */
4219 /* At first check the requested designation. */
4220 reg = CODING_ISO_REQUEST (coding, id);
4221 if (reg < 0)
4222 /* Since CHARSET requests no special designation, designate it
4223 to graphic register 0. */
4224 reg = 0;
4225
4226 ENCODE_DESIGNATION (charset, reg, coding);
4227 }
4228
4229 if (CODING_ISO_INVOCATION (coding, 0) != reg
4230 && CODING_ISO_INVOCATION (coding, 1) != reg)
4231 {
4232 /* Since the graphic register REG is not invoked to any graphic
4233 planes, invoke it to graphic plane 0. */
4234 switch (reg)
4235 {
4236 case 0: /* graphic register 0 */
4237 ENCODE_SHIFT_IN;
4238 break;
4239
4240 case 1: /* graphic register 1 */
4241 ENCODE_SHIFT_OUT;
4242 break;
4243
4244 case 2: /* graphic register 2 */
4245 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT)
4246 ENCODE_SINGLE_SHIFT_2;
4247 else
4248 ENCODE_LOCKING_SHIFT_2;
4249 break;
4250
4251 case 3: /* graphic register 3 */
4252 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_SINGLE_SHIFT)
4253 ENCODE_SINGLE_SHIFT_3;
4254 else
4255 ENCODE_LOCKING_SHIFT_3;
4256 break;
4257 }
4258 }
4259
4260 *p_nchars = produced_chars;
4261 return dst;
4262 }
4263
4264
4265 /* Produce codes for designation and invocation to reset the graphic
4266 planes and registers to initial state. */
4267 #define ENCODE_RESET_PLANE_AND_REGISTER() \
4268 do { \
4269 int reg; \
4270 struct charset *charset; \
4271 \
4272 if (CODING_ISO_INVOCATION (coding, 0) != 0) \
4273 ENCODE_SHIFT_IN; \
4274 for (reg = 0; reg < 4; reg++) \
4275 if (CODING_ISO_INITIAL (coding, reg) >= 0 \
4276 && (CODING_ISO_DESIGNATION (coding, reg) \
4277 != CODING_ISO_INITIAL (coding, reg))) \
4278 { \
4279 charset = CHARSET_FROM_ID (CODING_ISO_INITIAL (coding, reg)); \
4280 ENCODE_DESIGNATION (charset, reg, coding); \
4281 } \
4282 } while (0)
4283
4284
4285 /* Produce designation sequences of charsets in the line started from
4286 SRC to a place pointed by DST, and return updated DST.
4287
4288 If the current block ends before any end-of-line, we may fail to
4289 find all the necessary designations. */
4290
4291 static unsigned char *
4292 encode_designation_at_bol (struct coding_system *coding, int *charbuf,
4293 unsigned char *dst)
4294 {
4295 struct charset *charset;
4296 /* Table of charsets to be designated to each graphic register. */
4297 int r[4];
4298 int c, found = 0, reg;
4299 EMACS_INT produced_chars = 0;
4300 int multibytep = coding->dst_multibyte;
4301 Lisp_Object attrs;
4302 Lisp_Object charset_list;
4303
4304 attrs = CODING_ID_ATTRS (coding->id);
4305 charset_list = CODING_ATTR_CHARSET_LIST (attrs);
4306 if (EQ (charset_list, Qiso_2022))
4307 charset_list = Viso_2022_charset_list;
4308
4309 for (reg = 0; reg < 4; reg++)
4310 r[reg] = -1;
4311
4312 while (found < 4)
4313 {
4314 int id;
4315
4316 c = *charbuf++;
4317 if (c == '\n')
4318 break;
4319 charset = char_charset (c, charset_list, NULL);
4320 id = CHARSET_ID (charset);
4321 reg = CODING_ISO_REQUEST (coding, id);
4322 if (reg >= 0 && r[reg] < 0)
4323 {
4324 found++;
4325 r[reg] = id;
4326 }
4327 }
4328
4329 if (found)
4330 {
4331 for (reg = 0; reg < 4; reg++)
4332 if (r[reg] >= 0
4333 && CODING_ISO_DESIGNATION (coding, reg) != r[reg])
4334 ENCODE_DESIGNATION (CHARSET_FROM_ID (r[reg]), reg, coding);
4335 }
4336
4337 return dst;
4338 }
4339
4340 /* See the above "GENERAL NOTES on `encode_coding_XXX ()' functions". */
4341
4342 static int
4343 encode_coding_iso_2022 (struct coding_system *coding)
4344 {
4345 int multibytep = coding->dst_multibyte;
4346 int *charbuf = coding->charbuf;
4347 int *charbuf_end = charbuf + coding->charbuf_used;
4348 unsigned char *dst = coding->destination + coding->produced;
4349 unsigned char *dst_end = coding->destination + coding->dst_bytes;
4350 int safe_room = 16;
4351 int bol_designation
4352 = (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DESIGNATE_AT_BOL
4353 && CODING_ISO_BOL (coding));
4354 EMACS_INT produced_chars = 0;
4355 Lisp_Object attrs, eol_type, charset_list;
4356 int ascii_compatible;
4357 int c;
4358 int preferred_charset_id = -1;
4359
4360 CODING_GET_INFO (coding, attrs, charset_list);
4361 eol_type = inhibit_eol_conversion ? Qunix : CODING_ID_EOL_TYPE (coding->id);
4362 if (VECTORP (eol_type))
4363 eol_type = Qunix;
4364
4365 setup_iso_safe_charsets (attrs);
4366 /* Charset list may have been changed. */
4367 charset_list = CODING_ATTR_CHARSET_LIST (attrs);
4368 coding->safe_charsets = SDATA (CODING_ATTR_SAFE_CHARSETS (attrs));
4369
4370 ascii_compatible
4371 = (! NILP (CODING_ATTR_ASCII_COMPAT (attrs))
4372 && ! (CODING_ISO_FLAGS (coding) & (CODING_ISO_FLAG_DESIGNATION
4373 | CODING_ISO_FLAG_LOCKING_SHIFT)));
4374
4375 while (charbuf < charbuf_end)
4376 {
4377 ASSURE_DESTINATION (safe_room);
4378
4379 if (bol_designation)
4380 {
4381 unsigned char *dst_prev = dst;
4382
4383 /* We have to produce designation sequences if any now. */
4384 dst = encode_designation_at_bol (coding, charbuf, dst);
4385 bol_designation = 0;
4386 /* We are sure that designation sequences are all ASCII bytes. */
4387 produced_chars += dst - dst_prev;
4388 }
4389
4390 c = *charbuf++;
4391
4392 if (c < 0)
4393 {
4394 /* Handle an annotation. */
4395 switch (*charbuf)
4396 {
4397 case CODING_ANNOTATE_COMPOSITION_MASK:
4398 /* Not yet implemented. */
4399 break;
4400 case CODING_ANNOTATE_CHARSET_MASK:
4401 preferred_charset_id = charbuf[2];
4402 if (preferred_charset_id >= 0
4403 && NILP (Fmemq (make_number (preferred_charset_id),
4404 charset_list)))
4405 preferred_charset_id = -1;
4406 break;
4407 default:
4408 abort ();
4409 }
4410 charbuf += -c - 1;
4411 continue;
4412 }
4413
4414 /* Now encode the character C. */
4415 if (c < 0x20 || c == 0x7F)
4416 {
4417 if (c == '\n'
4418 || (c == '\r' && EQ (eol_type, Qmac)))
4419 {
4420 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_RESET_AT_EOL)
4421 ENCODE_RESET_PLANE_AND_REGISTER ();
4422 if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_INIT_AT_BOL)
4423 {
4424 int i;
4425
4426 for (i = 0; i < 4; i++)
4427 CODING_ISO_DESIGNATION (coding, i)
4428 = CODING_ISO_INITIAL (coding, i);
4429 }
4430 bol_designation
4431 = CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_DESIGNATE_AT_BOL;
4432 }
4433 else if (CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_RESET_AT_CNTL)
4434 ENCODE_RESET_PLANE_AND_REGISTER ();
4435 EMIT_ONE_ASCII_BYTE (c);
4436 }
4437 else if (ASCII_CHAR_P (c))
4438 {
4439 if (ascii_compatible)
4440 EMIT_ONE_ASCII_BYTE (c);
4441 else
4442 {
4443 struct charset *charset = CHARSET_FROM_ID (charset_ascii);
4444 ENCODE_ISO_CHARACTER (charset, c);
4445 }
4446 }
4447 else if (CHAR_BYTE8_P (c))
4448 {
4449 c = CHAR_TO_BYTE8 (c);
4450 EMIT_ONE_BYTE (c);
4451 }
4452 else
4453 {
4454 struct charset *charset;
4455
4456 if (preferred_charset_id >= 0)
4457 {
4458 charset = CHARSET_FROM_ID (preferred_charset_id);
4459 if (! CHAR_CHARSET_P (c, charset))
4460 charset = char_charset (c, charset_list, NULL);
4461 }
4462 else
4463 charset = char_charset (c, charset_list, NULL);
4464 if (!charset)
4465 {
4466 if (coding->mode & CODING_MODE_SAFE_ENCODING)
4467 {
4468 c = CODING_INHIBIT_CHARACTER_SUBSTITUTION;
4469 charset = CHARSET_FROM_ID (charset_ascii);
4470 }
4471 else
4472 {
4473 c = coding->default_char;
4474 charset = char_charset (c, charset_list, NULL);
4475 }
4476 }
4477 ENCODE_ISO_CHARACTER (charset, c);
4478 }
4479 }
4480
4481 if (coding->mode & CODING_MODE_LAST_BLOCK
4482 && CODING_ISO_FLAGS (coding) & CODING_ISO_FLAG_RESET_AT_EOL)
4483 {
4484 ASSURE_DESTINATION (safe_room);
4485 ENCODE_RESET_PLANE_AND_REGISTER ();
4486 }
4487 record_conversion_result (coding, CODING_RESULT_SUCCESS);
4488 CODING_ISO_BOL (coding) = bol_designation;
4489 coding->produced_char += produced_chars;
4490 coding->produced = dst - coding->destination;
4491 return 0;
4492 }
4493
4494 \f
4495 /*** 8,9. SJIS and BIG5 handlers ***/
4496
4497 /* Although SJIS and BIG5 are not ISO's coding system, they are used
4498 quite widely. So, for the moment, Emacs supports them in the bare
4499 C code. But, in the future, they may be supported only by CCL. */
4500
4501 /* SJIS is a coding system encoding three character sets: ASCII, right
4502 half of JISX0201-Kana, and JISX0208. An ASCII character is encoded
4503 as is. A character of charset katakana-jisx0201 is encoded by
4504 "position-code + 0x80". A character of charset japanese-jisx0208
4505 is encoded in 2-byte but two position-codes are divided and shifted
4506 so that it fit in the range below.
4507
4508 --- CODE RANGE of SJIS ---
4509 (character set) (range)
4510 ASCII 0x00 .. 0x7F
4511 KATAKANA-JISX0201 0xA0 .. 0xDF
4512 JISX0208 (1st byte) 0x81 .. 0x9F and 0xE0 .. 0xEF
4513 (2nd byte) 0x40 .. 0x7E and 0x80 .. 0xFC
4514 -------------------------------
4515
4516 */
4517
4518 /* BIG5 is a coding system encoding two character sets: ASCII and
4519 Big5. An ASCII character is encoded as is. Big5 is a two-byte
4520 character set and is encoded in two-byte.
4521
4522 --- CODE RANGE of BIG5 ---
4523 (character set) (range)
4524 ASCII 0x00 .. 0x7F
4525 Big5 (1st byte) 0xA1 .. 0xFE
4526 (2nd byte) 0x40 .. 0x7E and 0xA1 .. 0xFE
4527 --------------------------
4528
4529 */
4530
4531 /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
4532 Check if a text is encoded in SJIS. If it is, return
4533 CATEGORY_MASK_SJIS, else return 0. */
4534
4535 static int
4536 detect_coding_sjis (struct coding_system *coding,
4537 struct coding_detection_info *detect_info)
4538 {
4539 const unsigned char *src = coding->source, *src_base;
4540 const unsigned char *src_end = coding->source + coding->src_bytes;
4541 int multibytep = coding->src_multibyte;
4542 EMACS_INT consumed_chars = 0;
4543 int found = 0;
4544 int c;
4545 Lisp_Object attrs, charset_list;
4546 int max_first_byte_of_2_byte_code;
4547
4548 CODING_GET_INFO (coding, attrs, charset_list);
4549 max_first_byte_of_2_byte_code
4550 = (XINT (Flength (charset_list)) > 3 ? 0xFC : 0xEF);
4551
4552 detect_info->checked |= CATEGORY_MASK_SJIS;
4553 /* A coding system of this category is always ASCII compatible. */
4554 src += coding->head_ascii;
4555
4556 while (1)
4557 {
4558 src_base = src;
4559 ONE_MORE_BYTE (c);
4560 if (c < 0x80)
4561 continue;
4562 if ((c >= 0x81 && c <= 0x9F)
4563 || (c >= 0xE0 && c <= max_first_byte_of_2_byte_code))
4564 {
4565 ONE_MORE_BYTE (c);
4566 if (c < 0x40 || c == 0x7F || c > 0xFC)
4567 break;
4568 found = CATEGORY_MASK_SJIS;
4569 }
4570 else if (c >= 0xA0 && c < 0xE0)
4571 found = CATEGORY_MASK_SJIS;
4572 else
4573 break;
4574 }
4575 detect_info->rejected |= CATEGORY_MASK_SJIS;
4576 return 0;
4577
4578 no_more_source:
4579 if (src_base < src && coding->mode & CODING_MODE_LAST_BLOCK)
4580 {
4581 detect_info->rejected |= CATEGORY_MASK_SJIS;
4582 return 0;
4583 }
4584 detect_info->found |= found;
4585 return 1;
4586 }
4587
4588 /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
4589 Check if a text is encoded in BIG5. If it is, return
4590 CATEGORY_MASK_BIG5, else return 0. */
4591
4592 static int
4593 detect_coding_big5 (struct coding_system *coding,
4594 struct coding_detection_info *detect_info)
4595 {
4596 const unsigned char *src = coding->source, *src_base;
4597 const unsigned char *src_end = coding->source + coding->src_bytes;
4598 int multibytep = coding->src_multibyte;
4599 EMACS_INT consumed_chars = 0;
4600 int found = 0;
4601 int c;
4602
4603 detect_info->checked |= CATEGORY_MASK_BIG5;
4604 /* A coding system of this category is always ASCII compatible. */
4605 src += coding->head_ascii;
4606
4607 while (1)
4608 {
4609 src_base = src;
4610 ONE_MORE_BYTE (c);
4611 if (c < 0x80)
4612 continue;
4613 if (c >= 0xA1)
4614 {
4615 ONE_MORE_BYTE (c);
4616 if (c < 0x40 || (c >= 0x7F && c <= 0xA0))
4617 return 0;
4618 found = CATEGORY_MASK_BIG5;
4619 }
4620 else
4621 break;
4622 }
4623 detect_info->rejected |= CATEGORY_MASK_BIG5;
4624 return 0;
4625
4626 no_more_source:
4627 if (src_base < src && coding->mode & CODING_MODE_LAST_BLOCK)
4628 {
4629 detect_info->rejected |= CATEGORY_MASK_BIG5;
4630 return 0;
4631 }
4632 detect_info->found |= found;
4633 return 1;
4634 }
4635
4636 /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions".
4637 If SJIS_P is 1, decode SJIS text, else decode BIG5 test. */
4638
4639 static void
4640 decode_coding_sjis (struct coding_system *coding)
4641 {
4642 const unsigned char *src = coding->source + coding->consumed;
4643 const unsigned char *src_end = coding->source + coding->src_bytes;
4644 const unsigned char *src_base;
4645 int *charbuf = coding->charbuf + coding->charbuf_used;
4646 /* We may produce one charset annotation in one loop and one more at
4647 the end. */
4648 int *charbuf_end
4649 = coding->charbuf + coding->charbuf_size - (MAX_ANNOTATION_LENGTH * 2);
4650 EMACS_INT consumed_chars = 0, consumed_chars_base;
4651 int multibytep = coding->src_multibyte;
4652 struct charset *charset_roman, *charset_kanji, *charset_kana;
4653 struct charset *charset_kanji2;
4654 Lisp_Object attrs, charset_list, val;
4655 EMACS_INT char_offset = coding->produced_char;
4656 EMACS_INT last_offset = char_offset;
4657 int last_id = charset_ascii;
4658 int eol_dos =
4659 !inhibit_eol_conversion && EQ (CODING_ID_EOL_TYPE (coding->id), Qdos);
4660 int byte_after_cr = -1;
4661
4662 CODING_GET_INFO (coding, attrs, charset_list);
4663
4664 val = charset_list;
4665 charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
4666 charset_kana = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
4667 charset_kanji = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
4668 charset_kanji2 = NILP (val) ? NULL : CHARSET_FROM_ID (XINT (XCAR (val)));
4669
4670 while (1)
4671 {
4672 int c, c1;
4673 struct charset *charset;
4674
4675 src_base = src;
4676 consumed_chars_base = consumed_chars;
4677
4678 if (charbuf >= charbuf_end)
4679 {
4680 if (byte_after_cr >= 0)
4681 src_base--;
4682 break;
4683 }
4684
4685 if (byte_after_cr >= 0)
4686 c = byte_after_cr, byte_after_cr = -1;
4687 else
4688 ONE_MORE_BYTE (c);
4689 if (c < 0)
4690 goto invalid_code;
4691 if (c < 0x80)
4692 {
4693 if (eol_dos && c == '\r')
4694 ONE_MORE_BYTE (byte_after_cr);
4695 charset = charset_roman;
4696 }
4697 else if (c == 0x80 || c == 0xA0)
4698 goto invalid_code;
4699 else if (c >= 0xA1 && c <= 0xDF)
4700 {
4701 /* SJIS -> JISX0201-Kana */
4702 c &= 0x7F;
4703 charset = charset_kana;
4704 }
4705 else if (c <= 0xEF)
4706 {
4707 /* SJIS -> JISX0208 */
4708 ONE_MORE_BYTE (c1);
4709 if (c1 < 0x40 || c1 == 0x7F || c1 > 0xFC)
4710 goto invalid_code;
4711 c = (c << 8) | c1;
4712 SJIS_TO_JIS (c);
4713 charset = charset_kanji;
4714 }
4715 else if (c <= 0xFC && charset_kanji2)
4716 {
4717 /* SJIS -> JISX0213-2 */
4718 ONE_MORE_BYTE (c1);
4719 if (c1 < 0x40 || c1 == 0x7F || c1 > 0xFC)
4720 goto invalid_code;
4721 c = (c << 8) | c1;
4722 SJIS_TO_JIS2 (c);
4723 charset = charset_kanji2;
4724 }
4725 else
4726 goto invalid_code;
4727 if (charset->id != charset_ascii
4728 && last_id != charset->id)
4729 {
4730 if (last_id != charset_ascii)
4731 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
4732 last_id = charset->id;
4733 last_offset = char_offset;
4734 }
4735 CODING_DECODE_CHAR (coding, src, src_base, src_end, charset, c, c);
4736 *charbuf++ = c;
4737 char_offset++;
4738 continue;
4739
4740 invalid_code:
4741 src = src_base;
4742 consumed_chars = consumed_chars_base;
4743 ONE_MORE_BYTE (c);
4744 *charbuf++ = c < 0 ? -c : BYTE8_TO_CHAR (c);
4745 char_offset++;
4746 coding->errors++;
4747 }
4748
4749 no_more_source:
4750 if (last_id != charset_ascii)
4751 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
4752 coding->consumed_char += consumed_chars_base;
4753 coding->consumed = src_base - coding->source;
4754 coding->charbuf_used = charbuf - coding->charbuf;
4755 }
4756
4757 static void
4758 decode_coding_big5 (struct coding_system *coding)
4759 {
4760 const unsigned char *src = coding->source + coding->consumed;
4761 const unsigned char *src_end = coding->source + coding->src_bytes;
4762 const unsigned char *src_base;
4763 int *charbuf = coding->charbuf + coding->charbuf_used;
4764 /* We may produce one charset annotation in one loop and one more at
4765 the end. */
4766 int *charbuf_end
4767 = coding->charbuf + coding->charbuf_size - (MAX_ANNOTATION_LENGTH * 2);
4768 EMACS_INT consumed_chars = 0, consumed_chars_base;
4769 int multibytep = coding->src_multibyte;
4770 struct charset *charset_roman, *charset_big5;
4771 Lisp_Object attrs, charset_list, val;
4772 EMACS_INT char_offset = coding->produced_char;
4773 EMACS_INT last_offset = char_offset;
4774 int last_id = charset_ascii;
4775 int eol_dos =
4776 !inhibit_eol_conversion && EQ (CODING_ID_EOL_TYPE (coding->id), Qdos);
4777 int byte_after_cr = -1;
4778
4779 CODING_GET_INFO (coding, attrs, charset_list);
4780 val = charset_list;
4781 charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
4782 charset_big5 = CHARSET_FROM_ID (XINT (XCAR (val)));
4783
4784 while (1)
4785 {
4786 int c, c1;
4787 struct charset *charset;
4788
4789 src_base = src;
4790 consumed_chars_base = consumed_chars;
4791
4792 if (charbuf >= charbuf_end)
4793 {
4794 if (byte_after_cr >= 0)
4795 src_base--;
4796 break;
4797 }
4798
4799 if (byte_after_cr >= 0)
4800 c = byte_after_cr, byte_after_cr = -1;
4801 else
4802 ONE_MORE_BYTE (c);
4803
4804 if (c < 0)
4805 goto invalid_code;
4806 if (c < 0x80)
4807 {
4808 if (eol_dos && c == '\r')
4809 ONE_MORE_BYTE (byte_after_cr);
4810 charset = charset_roman;
4811 }
4812 else
4813 {
4814 /* BIG5 -> Big5 */
4815 if (c < 0xA1 || c > 0xFE)
4816 goto invalid_code;
4817 ONE_MORE_BYTE (c1);
4818 if (c1 < 0x40 || (c1 > 0x7E && c1 < 0xA1) || c1 > 0xFE)
4819 goto invalid_code;
4820 c = c << 8 | c1;
4821 charset = charset_big5;
4822 }
4823 if (charset->id != charset_ascii
4824 && last_id != charset->id)
4825 {
4826 if (last_id != charset_ascii)
4827 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
4828 last_id = charset->id;
4829 last_offset = char_offset;
4830 }
4831 CODING_DECODE_CHAR (coding, src, src_base, src_end, charset, c, c);
4832 *charbuf++ = c;
4833 char_offset++;
4834 continue;
4835
4836 invalid_code:
4837 src = src_base;
4838 consumed_chars = consumed_chars_base;
4839 ONE_MORE_BYTE (c);
4840 *charbuf++ = c < 0 ? -c : BYTE8_TO_CHAR (c);
4841 char_offset++;
4842 coding->errors++;
4843 }
4844
4845 no_more_source:
4846 if (last_id != charset_ascii)
4847 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
4848 coding->consumed_char += consumed_chars_base;
4849 coding->consumed = src_base - coding->source;
4850 coding->charbuf_used = charbuf - coding->charbuf;
4851 }
4852
4853 /* See the above "GENERAL NOTES on `encode_coding_XXX ()' functions".
4854 This function can encode charsets `ascii', `katakana-jisx0201',
4855 `japanese-jisx0208', `chinese-big5-1', and `chinese-big5-2'. We
4856 are sure that all these charsets are registered as official charset
4857 (i.e. do not have extended leading-codes). Characters of other
4858 charsets are produced without any encoding. If SJIS_P is 1, encode
4859 SJIS text, else encode BIG5 text. */
4860
4861 static int
4862 encode_coding_sjis (struct coding_system *coding)
4863 {
4864 int multibytep = coding->dst_multibyte;
4865 int *charbuf = coding->charbuf;
4866 int *charbuf_end = charbuf + coding->charbuf_used;
4867 unsigned char *dst = coding->destination + coding->produced;
4868 unsigned char *dst_end = coding->destination + coding->dst_bytes;
4869 int safe_room = 4;
4870 EMACS_INT produced_chars = 0;
4871 Lisp_Object attrs, charset_list, val;
4872 int ascii_compatible;
4873 struct charset *charset_kanji, *charset_kana;
4874 struct charset *charset_kanji2;
4875 int c;
4876
4877 CODING_GET_INFO (coding, attrs, charset_list);
4878 val = XCDR (charset_list);
4879 charset_kana = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
4880 charset_kanji = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
4881 charset_kanji2 = NILP (val) ? NULL : CHARSET_FROM_ID (XINT (XCAR (val)));
4882
4883 ascii_compatible = ! NILP (CODING_ATTR_ASCII_COMPAT (attrs));
4884
4885 while (charbuf < charbuf_end)
4886 {
4887 ASSURE_DESTINATION (safe_room);
4888 c = *charbuf++;
4889 /* Now encode the character C. */
4890 if (ASCII_CHAR_P (c) && ascii_compatible)
4891 EMIT_ONE_ASCII_BYTE (c);
4892 else if (CHAR_BYTE8_P (c))
4893 {
4894 c = CHAR_TO_BYTE8 (c);
4895 EMIT_ONE_BYTE (c);
4896 }
4897 else
4898 {
4899 unsigned code;
4900 struct charset *charset = char_charset (c, charset_list, &code);
4901
4902 if (!charset)
4903 {
4904 if (coding->mode & CODING_MODE_SAFE_ENCODING)
4905 {
4906 code = CODING_INHIBIT_CHARACTER_SUBSTITUTION;
4907 charset = CHARSET_FROM_ID (charset_ascii);
4908 }
4909 else
4910 {
4911 c = coding->default_char;
4912 charset = char_charset (c, charset_list, &code);
4913 }
4914 }
4915 if (code == CHARSET_INVALID_CODE (charset))
4916 abort ();
4917 if (charset == charset_kanji)
4918 {
4919 int c1, c2;
4920 JIS_TO_SJIS (code);
4921 c1 = code >> 8, c2 = code & 0xFF;
4922 EMIT_TWO_BYTES (c1, c2);
4923 }
4924 else if (charset == charset_kana)
4925 EMIT_ONE_BYTE (code | 0x80);
4926 else if (charset_kanji2 && charset == charset_kanji2)
4927 {
4928 int c1, c2;
4929
4930 c1 = code >> 8;
4931 if (c1 == 0x21 || (c1 >= 0x23 && c1 <= 0x25)
4932 || c1 == 0x28
4933 || (c1 >= 0x2C && c1 <= 0x2F) || c1 >= 0x6E)
4934 {
4935 JIS_TO_SJIS2 (code);
4936 c1 = code >> 8, c2 = code & 0xFF;
4937 EMIT_TWO_BYTES (c1, c2);
4938 }
4939 else
4940 EMIT_ONE_ASCII_BYTE (code & 0x7F);
4941 }
4942 else
4943 EMIT_ONE_ASCII_BYTE (code & 0x7F);
4944 }
4945 }
4946 record_conversion_result (coding, CODING_RESULT_SUCCESS);
4947 coding->produced_char += produced_chars;
4948 coding->produced = dst - coding->destination;
4949 return 0;
4950 }
4951
4952 static int
4953 encode_coding_big5 (struct coding_system *coding)
4954 {
4955 int multibytep = coding->dst_multibyte;
4956 int *charbuf = coding->charbuf;
4957 int *charbuf_end = charbuf + coding->charbuf_used;
4958 unsigned char *dst = coding->destination + coding->produced;
4959 unsigned char *dst_end = coding->destination + coding->dst_bytes;
4960 int safe_room = 4;
4961 EMACS_INT produced_chars = 0;
4962 Lisp_Object attrs, charset_list, val;
4963 int ascii_compatible;
4964 struct charset *charset_big5;
4965 int c;
4966
4967 CODING_GET_INFO (coding, attrs, charset_list);
4968 val = XCDR (charset_list);
4969 charset_big5 = CHARSET_FROM_ID (XINT (XCAR (val)));
4970 ascii_compatible = ! NILP (CODING_ATTR_ASCII_COMPAT (attrs));
4971
4972 while (charbuf < charbuf_end)
4973 {
4974 ASSURE_DESTINATION (safe_room);
4975 c = *charbuf++;
4976 /* Now encode the character C. */
4977 if (ASCII_CHAR_P (c) && ascii_compatible)
4978 EMIT_ONE_ASCII_BYTE (c);
4979 else if (CHAR_BYTE8_P (c))
4980 {
4981 c = CHAR_TO_BYTE8 (c);
4982 EMIT_ONE_BYTE (c);
4983 }
4984 else
4985 {
4986 unsigned code;
4987 struct charset *charset = char_charset (c, charset_list, &code);
4988
4989 if (! charset)
4990 {
4991 if (coding->mode & CODING_MODE_SAFE_ENCODING)
4992 {
4993 code = CODING_INHIBIT_CHARACTER_SUBSTITUTION;
4994 charset = CHARSET_FROM_ID (charset_ascii);
4995 }
4996 else
4997 {
4998 c = coding->default_char;
4999 charset = char_charset (c, charset_list, &code);
5000 }
5001 }
5002 if (code == CHARSET_INVALID_CODE (charset))
5003 abort ();
5004 if (charset == charset_big5)
5005 {
5006 int c1, c2;
5007
5008 c1 = code >> 8, c2 = code & 0xFF;
5009 EMIT_TWO_BYTES (c1, c2);
5010 }
5011 else
5012 EMIT_ONE_ASCII_BYTE (code & 0x7F);
5013 }
5014 }
5015 record_conversion_result (coding, CODING_RESULT_SUCCESS);
5016 coding->produced_char += produced_chars;
5017 coding->produced = dst - coding->destination;
5018 return 0;
5019 }
5020
5021 \f
5022 /*** 10. CCL handlers ***/
5023
5024 /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
5025 Check if a text is encoded in a coding system of which
5026 encoder/decoder are written in CCL program. If it is, return
5027 CATEGORY_MASK_CCL, else return 0. */
5028
5029 static int
5030 detect_coding_ccl (struct coding_system *coding,
5031 struct coding_detection_info *detect_info)
5032 {
5033 const unsigned char *src = coding->source, *src_base;
5034 const unsigned char *src_end = coding->source + coding->src_bytes;
5035 int multibytep = coding->src_multibyte;
5036 EMACS_INT consumed_chars = 0;
5037 int found = 0;
5038 unsigned char *valids;
5039 EMACS_INT head_ascii = coding->head_ascii;
5040 Lisp_Object attrs;
5041
5042 detect_info->checked |= CATEGORY_MASK_CCL;
5043
5044 coding = &coding_categories[coding_category_ccl];
5045 valids = CODING_CCL_VALIDS (coding);
5046 attrs = CODING_ID_ATTRS (coding->id);
5047 if (! NILP (CODING_ATTR_ASCII_COMPAT (attrs)))
5048 src += head_ascii;
5049
5050 while (1)
5051 {
5052 int c;
5053
5054 src_base = src;
5055 ONE_MORE_BYTE (c);
5056 if (c < 0 || ! valids[c])
5057 break;
5058 if ((valids[c] > 1))
5059 found = CATEGORY_MASK_CCL;
5060 }
5061 detect_info->rejected |= CATEGORY_MASK_CCL;
5062 return 0;
5063
5064 no_more_source:
5065 detect_info->found |= found;
5066 return 1;
5067 }
5068
5069 static void
5070 decode_coding_ccl (struct coding_system *coding)
5071 {
5072 const unsigned char *src = coding->source + coding->consumed;
5073 const unsigned char *src_end = coding->source + coding->src_bytes;
5074 int *charbuf = coding->charbuf + coding->charbuf_used;
5075 int *charbuf_end = coding->charbuf + coding->charbuf_size;
5076 EMACS_INT consumed_chars = 0;
5077 int multibytep = coding->src_multibyte;
5078 struct ccl_program *ccl = &coding->spec.ccl->ccl;
5079 int source_charbuf[1024];
5080 int source_byteidx[1025];
5081 Lisp_Object attrs, charset_list;
5082
5083 CODING_GET_INFO (coding, attrs, charset_list);
5084
5085 while (1)
5086 {
5087 const unsigned char *p = src;
5088 int i = 0;
5089
5090 if (multibytep)
5091 {
5092 while (i < 1024 && p < src_end)
5093 {
5094 source_byteidx[i] = p - src;
5095 source_charbuf[i++] = STRING_CHAR_ADVANCE (p);
5096 }
5097 source_byteidx[i] = p - src;
5098 }
5099 else
5100 while (i < 1024 && p < src_end)
5101 source_charbuf[i++] = *p++;
5102
5103 if (p == src_end && coding->mode & CODING_MODE_LAST_BLOCK)
5104 ccl->last_block = 1;
5105 ccl_driver (ccl, source_charbuf, charbuf, i, charbuf_end - charbuf,
5106 charset_list);
5107 charbuf += ccl->produced;
5108 if (multibytep)
5109 src += source_byteidx[ccl->consumed];
5110 else
5111 src += ccl->consumed;
5112 consumed_chars += ccl->consumed;
5113 if (p == src_end || ccl->status != CCL_STAT_SUSPEND_BY_SRC)
5114 break;
5115 }
5116
5117 switch (ccl->status)
5118 {
5119 case CCL_STAT_SUSPEND_BY_SRC:
5120 record_conversion_result (coding, CODING_RESULT_INSUFFICIENT_SRC);
5121 break;
5122 case CCL_STAT_SUSPEND_BY_DST:
5123 record_conversion_result (coding, CODING_RESULT_INSUFFICIENT_DST);
5124 break;
5125 case CCL_STAT_QUIT:
5126 case CCL_STAT_INVALID_CMD:
5127 record_conversion_result (coding, CODING_RESULT_INTERRUPT);
5128 break;
5129 default:
5130 record_conversion_result (coding, CODING_RESULT_SUCCESS);
5131 break;
5132 }
5133 coding->consumed_char += consumed_chars;
5134 coding->consumed = src - coding->source;
5135 coding->charbuf_used = charbuf - coding->charbuf;
5136 }
5137
5138 static int
5139 encode_coding_ccl (struct coding_system *coding)
5140 {
5141 struct ccl_program *ccl = &coding->spec.ccl->ccl;
5142 int multibytep = coding->dst_multibyte;
5143 int *charbuf = coding->charbuf;
5144 int *charbuf_end = charbuf + coding->charbuf_used;
5145 unsigned char *dst = coding->destination + coding->produced;
5146 unsigned char *dst_end = coding->destination + coding->dst_bytes;
5147 int destination_charbuf[1024];
5148 EMACS_INT produced_chars = 0;
5149 int i;
5150 Lisp_Object attrs, charset_list;
5151
5152 CODING_GET_INFO (coding, attrs, charset_list);
5153 if (coding->consumed_char == coding->src_chars
5154 && coding->mode & CODING_MODE_LAST_BLOCK)
5155 ccl->last_block = 1;
5156
5157 while (charbuf < charbuf_end)
5158 {
5159 ccl_driver (ccl, charbuf, destination_charbuf,
5160 charbuf_end - charbuf, 1024, charset_list);
5161 if (multibytep)
5162 {
5163 ASSURE_DESTINATION (ccl->produced * 2);
5164 for (i = 0; i < ccl->produced; i++)
5165 EMIT_ONE_BYTE (destination_charbuf[i] & 0xFF);
5166 }
5167 else
5168 {
5169 ASSURE_DESTINATION (ccl->produced);
5170 for (i = 0; i < ccl->produced; i++)
5171 *dst++ = destination_charbuf[i] & 0xFF;
5172 produced_chars += ccl->produced;
5173 }
5174 charbuf += ccl->consumed;
5175 if (ccl->status == CCL_STAT_QUIT
5176 || ccl->status == CCL_STAT_INVALID_CMD)
5177 break;
5178 }
5179
5180 switch (ccl->status)
5181 {
5182 case CCL_STAT_SUSPEND_BY_SRC:
5183 record_conversion_result (coding, CODING_RESULT_INSUFFICIENT_SRC);
5184 break;
5185 case CCL_STAT_SUSPEND_BY_DST:
5186 record_conversion_result (coding, CODING_RESULT_INSUFFICIENT_DST);
5187 break;
5188 case CCL_STAT_QUIT:
5189 case CCL_STAT_INVALID_CMD:
5190 record_conversion_result (coding, CODING_RESULT_INTERRUPT);
5191 break;
5192 default:
5193 record_conversion_result (coding, CODING_RESULT_SUCCESS);
5194 break;
5195 }
5196
5197 coding->produced_char += produced_chars;
5198 coding->produced = dst - coding->destination;
5199 return 0;
5200 }
5201
5202
5203 \f
5204 /*** 10, 11. no-conversion handlers ***/
5205
5206 /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". */
5207
5208 static void
5209 decode_coding_raw_text (struct coding_system *coding)
5210 {
5211 int eol_dos =
5212 !inhibit_eol_conversion && EQ (CODING_ID_EOL_TYPE (coding->id), Qdos);
5213
5214 coding->chars_at_source = 1;
5215 coding->consumed_char = coding->src_chars;
5216 coding->consumed = coding->src_bytes;
5217 if (eol_dos && coding->source[coding->src_bytes - 1] == '\r')
5218 {
5219 coding->consumed_char--;
5220 coding->consumed--;
5221 record_conversion_result (coding, CODING_RESULT_INSUFFICIENT_SRC);
5222 }
5223 else
5224 record_conversion_result (coding, CODING_RESULT_SUCCESS);
5225 }
5226
5227 static int
5228 encode_coding_raw_text (struct coding_system *coding)
5229 {
5230 int multibytep = coding->dst_multibyte;
5231 int *charbuf = coding->charbuf;
5232 int *charbuf_end = coding->charbuf + coding->charbuf_used;
5233 unsigned char *dst = coding->destination + coding->produced;
5234 unsigned char *dst_end = coding->destination + coding->dst_bytes;
5235 EMACS_INT produced_chars = 0;
5236 int c;
5237
5238 if (multibytep)
5239 {
5240 int safe_room = MAX_MULTIBYTE_LENGTH * 2;
5241
5242 if (coding->src_multibyte)
5243 while (charbuf < charbuf_end)
5244 {
5245 ASSURE_DESTINATION (safe_room);
5246 c = *charbuf++;
5247 if (ASCII_CHAR_P (c))
5248 EMIT_ONE_ASCII_BYTE (c);
5249 else if (CHAR_BYTE8_P (c))
5250 {
5251 c = CHAR_TO_BYTE8 (c);
5252 EMIT_ONE_BYTE (c);
5253 }
5254 else
5255 {
5256 unsigned char str[MAX_MULTIBYTE_LENGTH], *p0 = str, *p1 = str;
5257
5258 CHAR_STRING_ADVANCE (c, p1);
5259 do
5260 {
5261 EMIT_ONE_BYTE (*p0);
5262 p0++;
5263 }
5264 while (p0 < p1);
5265 }
5266 }
5267 else
5268 while (charbuf < charbuf_end)
5269 {
5270 ASSURE_DESTINATION (safe_room);
5271 c = *charbuf++;
5272 EMIT_ONE_BYTE (c);
5273 }
5274 }
5275 else
5276 {
5277 if (coding->src_multibyte)
5278 {
5279 int safe_room = MAX_MULTIBYTE_LENGTH;
5280
5281 while (charbuf < charbuf_end)
5282 {
5283 ASSURE_DESTINATION (safe_room);
5284 c = *charbuf++;
5285 if (ASCII_CHAR_P (c))
5286 *dst++ = c;
5287 else if (CHAR_BYTE8_P (c))
5288 *dst++ = CHAR_TO_BYTE8 (c);
5289 else
5290 CHAR_STRING_ADVANCE (c, dst);
5291 }
5292 }
5293 else
5294 {
5295 ASSURE_DESTINATION (charbuf_end - charbuf);
5296 while (charbuf < charbuf_end && dst < dst_end)
5297 *dst++ = *charbuf++;
5298 }
5299 produced_chars = dst - (coding->destination + coding->produced);
5300 }
5301 record_conversion_result (coding, CODING_RESULT_SUCCESS);
5302 coding->produced_char += produced_chars;
5303 coding->produced = dst - coding->destination;
5304 return 0;
5305 }
5306
5307 /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
5308 Check if a text is encoded in a charset-based coding system. If it
5309 is, return 1, else return 0. */
5310
5311 static int
5312 detect_coding_charset (struct coding_system *coding,
5313 struct coding_detection_info *detect_info)
5314 {
5315 const unsigned char *src = coding->source, *src_base;
5316 const unsigned char *src_end = coding->source + coding->src_bytes;
5317 int multibytep = coding->src_multibyte;
5318 EMACS_INT consumed_chars = 0;
5319 Lisp_Object attrs, valids, name;
5320 int found = 0;
5321 EMACS_INT head_ascii = coding->head_ascii;
5322 int check_latin_extra = 0;
5323
5324 detect_info->checked |= CATEGORY_MASK_CHARSET;
5325
5326 coding = &coding_categories[coding_category_charset];
5327 attrs = CODING_ID_ATTRS (coding->id);
5328 valids = AREF (attrs, coding_attr_charset_valids);
5329 name = CODING_ID_NAME (coding->id);
5330 if (strncmp (SSDATA (SYMBOL_NAME (name)),
5331 "iso-8859-", sizeof ("iso-8859-") - 1) == 0
5332 || strncmp (SSDATA (SYMBOL_NAME (name)),
5333 "iso-latin-", sizeof ("iso-latin-") - 1) == 0)
5334 check_latin_extra = 1;
5335
5336 if (! NILP (CODING_ATTR_ASCII_COMPAT (attrs)))
5337 src += head_ascii;
5338
5339 while (1)
5340 {
5341 int c;
5342 Lisp_Object val;
5343 struct charset *charset;
5344 int dim, idx;
5345
5346 src_base = src;
5347 ONE_MORE_BYTE (c);
5348 if (c < 0)
5349 continue;
5350 val = AREF (valids, c);
5351 if (NILP (val))
5352 break;
5353 if (c >= 0x80)
5354 {
5355 if (c < 0xA0
5356 && check_latin_extra
5357 && (!VECTORP (Vlatin_extra_code_table)
5358 || NILP (XVECTOR (Vlatin_extra_code_table)->contents[c])))
5359 break;
5360 found = CATEGORY_MASK_CHARSET;
5361 }
5362 if (INTEGERP (val))
5363 {
5364 charset = CHARSET_FROM_ID (XFASTINT (val));
5365 dim = CHARSET_DIMENSION (charset);
5366 for (idx = 1; idx < dim; idx++)
5367 {
5368 if (src == src_end)
5369 goto too_short;
5370 ONE_MORE_BYTE (c);
5371 if (c < charset->code_space[(dim - 1 - idx) * 4]
5372 || c > charset->code_space[(dim - 1 - idx) * 4 + 1])
5373 break;
5374 }
5375 if (idx < dim)
5376 break;
5377 }
5378 else
5379 {
5380 idx = 1;
5381 for (; CONSP (val); val = XCDR (val))
5382 {
5383 charset = CHARSET_FROM_ID (XFASTINT (XCAR (val)));
5384 dim = CHARSET_DIMENSION (charset);
5385 while (idx < dim)
5386 {
5387 if (src == src_end)
5388 goto too_short;
5389 ONE_MORE_BYTE (c);
5390 if (c < charset->code_space[(dim - 1 - idx) * 4]
5391 || c > charset->code_space[(dim - 1 - idx) * 4 + 1])
5392 break;
5393 idx++;
5394 }
5395 if (idx == dim)
5396 {
5397 val = Qnil;
5398 break;
5399 }
5400 }
5401 if (CONSP (val))
5402 break;
5403 }
5404 }
5405 too_short:
5406 detect_info->rejected |= CATEGORY_MASK_CHARSET;
5407 return 0;
5408
5409 no_more_source:
5410 detect_info->found |= found;
5411 return 1;
5412 }
5413
5414 static void
5415 decode_coding_charset (struct coding_system *coding)
5416 {
5417 const unsigned char *src = coding->source + coding->consumed;
5418 const unsigned char *src_end = coding->source + coding->src_bytes;
5419 const unsigned char *src_base;
5420 int *charbuf = coding->charbuf + coding->charbuf_used;
5421 /* We may produce one charset annotation in one loop and one more at
5422 the end. */
5423 int *charbuf_end
5424 = coding->charbuf + coding->charbuf_size - (MAX_ANNOTATION_LENGTH * 2);
5425 EMACS_INT consumed_chars = 0, consumed_chars_base;
5426 int multibytep = coding->src_multibyte;
5427 Lisp_Object attrs = CODING_ID_ATTRS (coding->id);
5428 Lisp_Object valids;
5429 EMACS_INT char_offset = coding->produced_char;
5430 EMACS_INT last_offset = char_offset;
5431 int last_id = charset_ascii;
5432 int eol_dos =
5433 !inhibit_eol_conversion && EQ (CODING_ID_EOL_TYPE (coding->id), Qdos);
5434 int byte_after_cr = -1;
5435
5436 valids = AREF (attrs, coding_attr_charset_valids);
5437
5438 while (1)
5439 {
5440 int c;
5441 Lisp_Object val;
5442 struct charset *charset;
5443 int dim;
5444 int len = 1;
5445 unsigned code;
5446
5447 src_base = src;
5448 consumed_chars_base = consumed_chars;
5449
5450 if (charbuf >= charbuf_end)
5451 {
5452 if (byte_after_cr >= 0)
5453 src_base--;
5454 break;
5455 }
5456
5457 if (byte_after_cr >= 0)
5458 {
5459 c = byte_after_cr;
5460 byte_after_cr = -1;
5461 }
5462 else
5463 {
5464 ONE_MORE_BYTE (c);
5465 if (eol_dos && c == '\r')
5466 ONE_MORE_BYTE (byte_after_cr);
5467 }
5468 if (c < 0)
5469 goto invalid_code;
5470 code = c;
5471
5472 val = AREF (valids, c);
5473 if (! INTEGERP (val) && ! CONSP (val))
5474 goto invalid_code;
5475 if (INTEGERP (val))
5476 {
5477 charset = CHARSET_FROM_ID (XFASTINT (val));
5478 dim = CHARSET_DIMENSION (charset);
5479 while (len < dim)
5480 {
5481 ONE_MORE_BYTE (c);
5482 code = (code << 8) | c;
5483 len++;
5484 }
5485 CODING_DECODE_CHAR (coding, src, src_base, src_end,
5486 charset, code, c);
5487 }
5488 else
5489 {
5490 /* VAL is a list of charset IDs. It is assured that the
5491 list is sorted by charset dimensions (smaller one
5492 comes first). */
5493 while (CONSP (val))
5494 {
5495 charset = CHARSET_FROM_ID (XFASTINT (XCAR (val)));
5496 dim = CHARSET_DIMENSION (charset);
5497 while (len < dim)
5498 {
5499 ONE_MORE_BYTE (c);
5500 code = (code << 8) | c;
5501 len++;
5502 }
5503 CODING_DECODE_CHAR (coding, src, src_base,
5504 src_end, charset, code, c);
5505 if (c >= 0)
5506 break;
5507 val = XCDR (val);
5508 }
5509 }
5510 if (c < 0)
5511 goto invalid_code;
5512 if (charset->id != charset_ascii
5513 && last_id != charset->id)
5514 {
5515 if (last_id != charset_ascii)
5516 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
5517 last_id = charset->id;
5518 last_offset = char_offset;
5519 }
5520
5521 *charbuf++ = c;
5522 char_offset++;
5523 continue;
5524
5525 invalid_code:
5526 src = src_base;
5527 consumed_chars = consumed_chars_base;
5528 ONE_MORE_BYTE (c);
5529 *charbuf++ = c < 0 ? -c : ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c);
5530 char_offset++;
5531 coding->errors++;
5532 }
5533
5534 no_more_source:
5535 if (last_id != charset_ascii)
5536 ADD_CHARSET_DATA (charbuf, char_offset - last_offset, last_id);
5537 coding->consumed_char += consumed_chars_base;
5538 coding->consumed = src_base - coding->source;
5539 coding->charbuf_used = charbuf - coding->charbuf;
5540 }
5541
5542 static int
5543 encode_coding_charset (struct coding_system *coding)
5544 {
5545 int multibytep = coding->dst_multibyte;
5546 int *charbuf = coding->charbuf;
5547 int *charbuf_end = charbuf + coding->charbuf_used;
5548 unsigned char *dst = coding->destination + coding->produced;
5549 unsigned char *dst_end = coding->destination + coding->dst_bytes;
5550 int safe_room = MAX_MULTIBYTE_LENGTH;
5551 EMACS_INT produced_chars = 0;
5552 Lisp_Object attrs, charset_list;
5553 int ascii_compatible;
5554 int c;
5555
5556 CODING_GET_INFO (coding, attrs, charset_list);
5557 ascii_compatible = ! NILP (CODING_ATTR_ASCII_COMPAT (attrs));
5558
5559 while (charbuf < charbuf_end)
5560 {
5561 struct charset *charset;
5562 unsigned code;
5563
5564 ASSURE_DESTINATION (safe_room);
5565 c = *charbuf++;
5566 if (ascii_compatible && ASCII_CHAR_P (c))
5567 EMIT_ONE_ASCII_BYTE (c);
5568 else if (CHAR_BYTE8_P (c))
5569 {
5570 c = CHAR_TO_BYTE8 (c);
5571 EMIT_ONE_BYTE (c);
5572 }
5573 else
5574 {
5575 charset = char_charset (c, charset_list, &code);
5576 if (charset)
5577 {
5578 if (CHARSET_DIMENSION (charset) == 1)
5579 EMIT_ONE_BYTE (code);
5580 else if (CHARSET_DIMENSION (charset) == 2)
5581 EMIT_TWO_BYTES (code >> 8, code & 0xFF);
5582 else if (CHARSET_DIMENSION (charset) == 3)
5583 EMIT_THREE_BYTES (code >> 16, (code >> 8) & 0xFF, code & 0xFF);
5584 else
5585 EMIT_FOUR_BYTES (code >> 24, (code >> 16) & 0xFF,
5586 (code >> 8) & 0xFF, code & 0xFF);
5587 }
5588 else
5589 {
5590 if (coding->mode & CODING_MODE_SAFE_ENCODING)
5591 c = CODING_INHIBIT_CHARACTER_SUBSTITUTION;
5592 else
5593 c = coding->default_char;
5594 EMIT_ONE_BYTE (c);
5595 }
5596 }
5597 }
5598
5599 record_conversion_result (coding, CODING_RESULT_SUCCESS);
5600 coding->produced_char += produced_chars;
5601 coding->produced = dst - coding->destination;
5602 return 0;
5603 }
5604
5605 \f
5606 /*** 7. C library functions ***/
5607
5608 /* Setup coding context CODING from information about CODING_SYSTEM.
5609 If CODING_SYSTEM is nil, `no-conversion' is assumed. If
5610 CODING_SYSTEM is invalid, signal an error. */
5611
5612 void
5613 setup_coding_system (Lisp_Object coding_system, struct coding_system *coding)
5614 {
5615 Lisp_Object attrs;
5616 Lisp_Object eol_type;
5617 Lisp_Object coding_type;
5618 Lisp_Object val;
5619
5620 if (NILP (coding_system))
5621 coding_system = Qundecided;
5622
5623 CHECK_CODING_SYSTEM_GET_ID (coding_system, coding->id);
5624
5625 attrs = CODING_ID_ATTRS (coding->id);
5626 eol_type = inhibit_eol_conversion ? Qunix : CODING_ID_EOL_TYPE (coding->id);
5627
5628 coding->mode = 0;
5629 coding->head_ascii = -1;
5630 if (VECTORP (eol_type))
5631 coding->common_flags = (CODING_REQUIRE_DECODING_MASK
5632 | CODING_REQUIRE_DETECTION_MASK);
5633 else if (! EQ (eol_type, Qunix))
5634 coding->common_flags = (CODING_REQUIRE_DECODING_MASK
5635 | CODING_REQUIRE_ENCODING_MASK);
5636 else
5637 coding->common_flags = 0;
5638 if (! NILP (CODING_ATTR_POST_READ (attrs)))
5639 coding->common_flags |= CODING_REQUIRE_DECODING_MASK;
5640 if (! NILP (CODING_ATTR_PRE_WRITE (attrs)))
5641 coding->common_flags |= CODING_REQUIRE_ENCODING_MASK;
5642 if (! NILP (CODING_ATTR_FOR_UNIBYTE (attrs)))
5643 coding->common_flags |= CODING_FOR_UNIBYTE_MASK;
5644
5645 val = CODING_ATTR_SAFE_CHARSETS (attrs);
5646 coding->max_charset_id = SCHARS (val) - 1;
5647 coding->safe_charsets = SDATA (val);
5648 coding->default_char = XINT (CODING_ATTR_DEFAULT_CHAR (attrs));
5649 coding->carryover_bytes = 0;
5650
5651 coding_type = CODING_ATTR_TYPE (attrs);
5652 if (EQ (coding_type, Qundecided))
5653 {
5654 coding->detector = NULL;
5655 coding->decoder = decode_coding_raw_text;
5656 coding->encoder = encode_coding_raw_text;
5657 coding->common_flags |= CODING_REQUIRE_DETECTION_MASK;
5658 }
5659 else if (EQ (coding_type, Qiso_2022))
5660 {
5661 int i;
5662 int flags = XINT (AREF (attrs, coding_attr_iso_flags));
5663
5664 /* Invoke graphic register 0 to plane 0. */
5665 CODING_ISO_INVOCATION (coding, 0) = 0;
5666 /* Invoke graphic register 1 to plane 1 if we can use 8-bit. */
5667 CODING_ISO_INVOCATION (coding, 1)
5668 = (flags & CODING_ISO_FLAG_SEVEN_BITS ? -1 : 1);
5669 /* Setup the initial status of designation. */
5670 for (i = 0; i < 4; i++)
5671 CODING_ISO_DESIGNATION (coding, i) = CODING_ISO_INITIAL (coding, i);
5672 /* Not single shifting initially. */
5673 CODING_ISO_SINGLE_SHIFTING (coding) = 0;
5674 /* Beginning of buffer should also be regarded as bol. */
5675 CODING_ISO_BOL (coding) = 1;
5676 coding->detector = detect_coding_iso_2022;
5677 coding->decoder = decode_coding_iso_2022;
5678 coding->encoder = encode_coding_iso_2022;
5679 if (flags & CODING_ISO_FLAG_SAFE)
5680 coding->mode |= CODING_MODE_SAFE_ENCODING;
5681 coding->common_flags
5682 |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK
5683 | CODING_REQUIRE_FLUSHING_MASK);
5684 if (flags & CODING_ISO_FLAG_COMPOSITION)
5685 coding->common_flags |= CODING_ANNOTATE_COMPOSITION_MASK;
5686 if (flags & CODING_ISO_FLAG_DESIGNATION)
5687 coding->common_flags |= CODING_ANNOTATE_CHARSET_MASK;
5688 if (flags & CODING_ISO_FLAG_FULL_SUPPORT)
5689 {
5690 setup_iso_safe_charsets (attrs);
5691 val = CODING_ATTR_SAFE_CHARSETS (attrs);
5692 coding->max_charset_id = SCHARS (val) - 1;
5693 coding->safe_charsets = SDATA (val);
5694 }
5695 CODING_ISO_FLAGS (coding) = flags;
5696 CODING_ISO_CMP_STATUS (coding)->state = COMPOSING_NO;
5697 CODING_ISO_CMP_STATUS (coding)->method = COMPOSITION_NO;
5698 CODING_ISO_EXTSEGMENT_LEN (coding) = 0;
5699 CODING_ISO_EMBEDDED_UTF_8 (coding) = 0;
5700 }
5701 else if (EQ (coding_type, Qcharset))
5702 {
5703 coding->detector = detect_coding_charset;
5704 coding->decoder = decode_coding_charset;
5705 coding->encoder = encode_coding_charset;
5706 coding->common_flags
5707 |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK);
5708 }
5709 else if (EQ (coding_type, Qutf_8))
5710 {
5711 val = AREF (attrs, coding_attr_utf_bom);
5712 CODING_UTF_8_BOM (coding) = (CONSP (val) ? utf_detect_bom
5713 : EQ (val, Qt) ? utf_with_bom
5714 : utf_without_bom);
5715 coding->detector = detect_coding_utf_8;
5716 coding->decoder = decode_coding_utf_8;
5717 coding->encoder = encode_coding_utf_8;
5718 coding->common_flags
5719 |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK);
5720 if (CODING_UTF_8_BOM (coding) == utf_detect_bom)
5721 coding->common_flags |= CODING_REQUIRE_DETECTION_MASK;
5722 }
5723 else if (EQ (coding_type, Qutf_16))
5724 {
5725 val = AREF (attrs, coding_attr_utf_bom);
5726 CODING_UTF_16_BOM (coding) = (CONSP (val) ? utf_detect_bom
5727 : EQ (val, Qt) ? utf_with_bom
5728 : utf_without_bom);
5729 val = AREF (attrs, coding_attr_utf_16_endian);
5730 CODING_UTF_16_ENDIAN (coding) = (EQ (val, Qbig) ? utf_16_big_endian
5731 : utf_16_little_endian);
5732 CODING_UTF_16_SURROGATE (coding) = 0;
5733 coding->detector = detect_coding_utf_16;
5734 coding->decoder = decode_coding_utf_16;
5735 coding->encoder = encode_coding_utf_16;
5736 coding->common_flags
5737 |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK);
5738 if (CODING_UTF_16_BOM (coding) == utf_detect_bom)
5739 coding->common_flags |= CODING_REQUIRE_DETECTION_MASK;
5740 }
5741 else if (EQ (coding_type, Qccl))
5742 {
5743 coding->detector = detect_coding_ccl;
5744 coding->decoder = decode_coding_ccl;
5745 coding->encoder = encode_coding_ccl;
5746 coding->common_flags
5747 |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK
5748 | CODING_REQUIRE_FLUSHING_MASK);
5749 }
5750 else if (EQ (coding_type, Qemacs_mule))
5751 {
5752 coding->detector = detect_coding_emacs_mule;
5753 coding->decoder = decode_coding_emacs_mule;
5754 coding->encoder = encode_coding_emacs_mule;
5755 coding->common_flags
5756 |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK);
5757 coding->spec.emacs_mule.full_support = 1;
5758 if (! NILP (AREF (attrs, coding_attr_emacs_mule_full))
5759 && ! EQ (CODING_ATTR_CHARSET_LIST (attrs), Vemacs_mule_charset_list))
5760 {
5761 Lisp_Object tail, safe_charsets;
5762 int max_charset_id = 0;
5763
5764 for (tail = Vemacs_mule_charset_list; CONSP (tail);
5765 tail = XCDR (tail))
5766 if (max_charset_id < XFASTINT (XCAR (tail)))
5767 max_charset_id = XFASTINT (XCAR (tail));
5768 safe_charsets = make_uninit_string (max_charset_id + 1);
5769 memset (SDATA (safe_charsets), 255, max_charset_id + 1);
5770 for (tail = Vemacs_mule_charset_list; CONSP (tail);
5771 tail = XCDR (tail))
5772 SSET (safe_charsets, XFASTINT (XCAR (tail)), 0);
5773 coding->max_charset_id = max_charset_id;
5774 coding->safe_charsets = SDATA (safe_charsets);
5775 coding->spec.emacs_mule.full_support = 1;
5776 }
5777 coding->spec.emacs_mule.cmp_status.state = COMPOSING_NO;
5778 coding->spec.emacs_mule.cmp_status.method = COMPOSITION_NO;
5779 }
5780 else if (EQ (coding_type, Qshift_jis))
5781 {
5782 coding->detector = detect_coding_sjis;
5783 coding->decoder = decode_coding_sjis;
5784 coding->encoder = encode_coding_sjis;
5785 coding->common_flags
5786 |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK);
5787 }
5788 else if (EQ (coding_type, Qbig5))
5789 {
5790 coding->detector = detect_coding_big5;
5791 coding->decoder = decode_coding_big5;
5792 coding->encoder = encode_coding_big5;
5793 coding->common_flags
5794 |= (CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK);
5795 }
5796 else /* EQ (coding_type, Qraw_text) */
5797 {
5798 coding->detector = NULL;
5799 coding->decoder = decode_coding_raw_text;
5800 coding->encoder = encode_coding_raw_text;
5801 if (! EQ (eol_type, Qunix))
5802 {
5803 coding->common_flags |= CODING_REQUIRE_DECODING_MASK;
5804 if (! VECTORP (eol_type))
5805 coding->common_flags |= CODING_REQUIRE_ENCODING_MASK;
5806 }
5807
5808 }
5809
5810 return;
5811 }
5812
5813 /* Return a list of charsets supported by CODING. */
5814
5815 Lisp_Object
5816 coding_charset_list (struct coding_system *coding)
5817 {
5818 Lisp_Object attrs, charset_list;
5819
5820 CODING_GET_INFO (coding, attrs, charset_list);
5821 if (EQ (CODING_ATTR_TYPE (attrs), Qiso_2022))
5822 {
5823 int flags = XINT (AREF (attrs, coding_attr_iso_flags));
5824
5825 if (flags & CODING_ISO_FLAG_FULL_SUPPORT)
5826 charset_list = Viso_2022_charset_list;
5827 }
5828 else if (EQ (CODING_ATTR_TYPE (attrs), Qemacs_mule))
5829 {
5830 charset_list = Vemacs_mule_charset_list;
5831 }
5832 return charset_list;
5833 }
5834
5835
5836 /* Return a list of charsets supported by CODING-SYSTEM. */
5837
5838 Lisp_Object
5839 coding_system_charset_list (Lisp_Object coding_system)
5840 {
5841 int id;
5842 Lisp_Object attrs, charset_list;
5843
5844 CHECK_CODING_SYSTEM_GET_ID (coding_system, id);
5845 attrs = CODING_ID_ATTRS (id);
5846
5847 if (EQ (CODING_ATTR_TYPE (attrs), Qiso_2022))
5848 {
5849 int flags = XINT (AREF (attrs, coding_attr_iso_flags));
5850
5851 if (flags & CODING_ISO_FLAG_FULL_SUPPORT)
5852 charset_list = Viso_2022_charset_list;
5853 else
5854 charset_list = CODING_ATTR_CHARSET_LIST (attrs);
5855 }
5856 else if (EQ (CODING_ATTR_TYPE (attrs), Qemacs_mule))
5857 {
5858 charset_list = Vemacs_mule_charset_list;
5859 }
5860 else
5861 {
5862 charset_list = CODING_ATTR_CHARSET_LIST (attrs);
5863 }
5864 return charset_list;
5865 }
5866
5867
5868 /* Return raw-text or one of its subsidiaries that has the same
5869 eol_type as CODING-SYSTEM. */
5870
5871 Lisp_Object
5872 raw_text_coding_system (Lisp_Object coding_system)
5873 {
5874 Lisp_Object spec, attrs;
5875 Lisp_Object eol_type, raw_text_eol_type;
5876
5877 if (NILP (coding_system))
5878 return Qraw_text;
5879 spec = CODING_SYSTEM_SPEC (coding_system);
5880 attrs = AREF (spec, 0);
5881
5882 if (EQ (CODING_ATTR_TYPE (attrs), Qraw_text))
5883 return coding_system;
5884
5885 eol_type = AREF (spec, 2);
5886 if (VECTORP (eol_type))
5887 return Qraw_text;
5888 spec = CODING_SYSTEM_SPEC (Qraw_text);
5889 raw_text_eol_type = AREF (spec, 2);
5890 return (EQ (eol_type, Qunix) ? AREF (raw_text_eol_type, 0)
5891 : EQ (eol_type, Qdos) ? AREF (raw_text_eol_type, 1)
5892 : AREF (raw_text_eol_type, 2));
5893 }
5894
5895
5896 /* If CODING_SYSTEM doesn't specify end-of-line format, return one of
5897 the subsidiary that has the same eol-spec as PARENT (if it is not
5898 nil and specifies end-of-line format) or the system's setting
5899 (system_eol_type). */
5900
5901 Lisp_Object
5902 coding_inherit_eol_type (Lisp_Object coding_system, Lisp_Object parent)
5903 {
5904 Lisp_Object spec, eol_type;
5905
5906 if (NILP (coding_system))
5907 coding_system = Qraw_text;
5908 spec = CODING_SYSTEM_SPEC (coding_system);
5909 eol_type = AREF (spec, 2);
5910 if (VECTORP (eol_type))
5911 {
5912 Lisp_Object parent_eol_type;
5913
5914 if (! NILP (parent))
5915 {
5916 Lisp_Object parent_spec;
5917
5918 parent_spec = CODING_SYSTEM_SPEC (parent);
5919 parent_eol_type = AREF (parent_spec, 2);
5920 if (VECTORP (parent_eol_type))
5921 parent_eol_type = system_eol_type;
5922 }
5923 else
5924 parent_eol_type = system_eol_type;
5925 if (EQ (parent_eol_type, Qunix))
5926 coding_system = AREF (eol_type, 0);
5927 else if (EQ (parent_eol_type, Qdos))
5928 coding_system = AREF (eol_type, 1);
5929 else if (EQ (parent_eol_type, Qmac))
5930 coding_system = AREF (eol_type, 2);
5931 }
5932 return coding_system;
5933 }
5934
5935
5936 /* Check if text-conversion and eol-conversion of CODING_SYSTEM are
5937 decided for writing to a process. If not, complement them, and
5938 return a new coding system. */
5939
5940 Lisp_Object
5941 complement_process_encoding_system (Lisp_Object coding_system)
5942 {
5943 Lisp_Object coding_base = Qnil, eol_base = Qnil;
5944 Lisp_Object spec, attrs;
5945 int i;
5946
5947 for (i = 0; i < 3; i++)
5948 {
5949 if (i == 1)
5950 coding_system = CDR_SAFE (Vdefault_process_coding_system);
5951 else if (i == 2)
5952 coding_system = preferred_coding_system ();
5953 spec = CODING_SYSTEM_SPEC (coding_system);
5954 if (NILP (spec))
5955 continue;
5956 attrs = AREF (spec, 0);
5957 if (NILP (coding_base) && ! EQ (CODING_ATTR_TYPE (attrs), Qundecided))
5958 coding_base = CODING_ATTR_BASE_NAME (attrs);
5959 if (NILP (eol_base) && ! VECTORP (AREF (spec, 2)))
5960 eol_base = coding_system;
5961 if (! NILP (coding_base) && ! NILP (eol_base))
5962 break;
5963 }
5964
5965 if (i > 0)
5966 /* The original CODING_SYSTEM didn't specify text-conversion or
5967 eol-conversion. Be sure that we return a fully complemented
5968 coding system. */
5969 coding_system = coding_inherit_eol_type (coding_base, eol_base);
5970 return coding_system;
5971 }
5972
5973
5974 /* Emacs has a mechanism to automatically detect a coding system if it
5975 is one of Emacs' internal format, ISO2022, SJIS, and BIG5. But,
5976 it's impossible to distinguish some coding systems accurately
5977 because they use the same range of codes. So, at first, coding
5978 systems are categorized into 7, those are:
5979
5980 o coding-category-emacs-mule
5981
5982 The category for a coding system which has the same code range
5983 as Emacs' internal format. Assigned the coding-system (Lisp
5984 symbol) `emacs-mule' by default.
5985
5986 o coding-category-sjis
5987
5988 The category for a coding system which has the same code range
5989 as SJIS. Assigned the coding-system (Lisp
5990 symbol) `japanese-shift-jis' by default.
5991
5992 o coding-category-iso-7
5993
5994 The category for a coding system which has the same code range
5995 as ISO2022 of 7-bit environment. This doesn't use any locking
5996 shift and single shift functions. This can encode/decode all
5997 charsets. Assigned the coding-system (Lisp symbol)
5998 `iso-2022-7bit' by default.
5999
6000 o coding-category-iso-7-tight
6001
6002 Same as coding-category-iso-7 except that this can
6003 encode/decode only the specified charsets.
6004
6005 o coding-category-iso-8-1
6006
6007 The category for a coding system which has the same code range
6008 as ISO2022 of 8-bit environment and graphic plane 1 used only
6009 for DIMENSION1 charset. This doesn't use any locking shift
6010 and single shift functions. Assigned the coding-system (Lisp
6011 symbol) `iso-latin-1' by default.
6012
6013 o coding-category-iso-8-2
6014
6015 The category for a coding system which has the same code range
6016 as ISO2022 of 8-bit environment and graphic plane 1 used only
6017 for DIMENSION2 charset. This doesn't use any locking shift
6018 and single shift functions. Assigned the coding-system (Lisp
6019 symbol) `japanese-iso-8bit' by default.
6020
6021 o coding-category-iso-7-else
6022
6023 The category for a coding system which has the same code range
6024 as ISO2022 of 7-bit environment but uses locking shift or
6025 single shift functions. Assigned the coding-system (Lisp
6026 symbol) `iso-2022-7bit-lock' by default.
6027
6028 o coding-category-iso-8-else
6029
6030 The category for a coding system which has the same code range
6031 as ISO2022 of 8-bit environment but uses locking shift or
6032 single shift functions. Assigned the coding-system (Lisp
6033 symbol) `iso-2022-8bit-ss2' by default.
6034
6035 o coding-category-big5
6036
6037 The category for a coding system which has the same code range
6038 as BIG5. Assigned the coding-system (Lisp symbol)
6039 `cn-big5' by default.
6040
6041 o coding-category-utf-8
6042
6043 The category for a coding system which has the same code range
6044 as UTF-8 (cf. RFC3629). Assigned the coding-system (Lisp
6045 symbol) `utf-8' by default.
6046
6047 o coding-category-utf-16-be
6048
6049 The category for a coding system in which a text has an
6050 Unicode signature (cf. Unicode Standard) in the order of BIG
6051 endian at the head. Assigned the coding-system (Lisp symbol)
6052 `utf-16-be' by default.
6053
6054 o coding-category-utf-16-le
6055
6056 The category for a coding system in which a text has an
6057 Unicode signature (cf. Unicode Standard) in the order of
6058 LITTLE endian at the head. Assigned the coding-system (Lisp
6059 symbol) `utf-16-le' by default.
6060
6061 o coding-category-ccl
6062
6063 The category for a coding system of which encoder/decoder is
6064 written in CCL programs. The default value is nil, i.e., no
6065 coding system is assigned.
6066
6067 o coding-category-binary
6068
6069 The category for a coding system not categorized in any of the
6070 above. Assigned the coding-system (Lisp symbol)
6071 `no-conversion' by default.
6072
6073 Each of them is a Lisp symbol and the value is an actual
6074 `coding-system's (this is also a Lisp symbol) assigned by a user.
6075 What Emacs does actually is to detect a category of coding system.
6076 Then, it uses a `coding-system' assigned to it. If Emacs can't
6077 decide only one possible category, it selects a category of the
6078 highest priority. Priorities of categories are also specified by a
6079 user in a Lisp variable `coding-category-list'.
6080
6081 */
6082
6083 #define EOL_SEEN_NONE 0
6084 #define EOL_SEEN_LF 1
6085 #define EOL_SEEN_CR 2
6086 #define EOL_SEEN_CRLF 4
6087
6088 /* Detect how end-of-line of a text of length SRC_BYTES pointed by
6089 SOURCE is encoded. If CATEGORY is one of
6090 coding_category_utf_16_XXXX, assume that CR and LF are encoded by
6091 two-byte, else they are encoded by one-byte.
6092
6093 Return one of EOL_SEEN_XXX. */
6094
6095 #define MAX_EOL_CHECK_COUNT 3
6096
6097 static int
6098 detect_eol (const unsigned char *source, EMACS_INT src_bytes,
6099 enum coding_category category)
6100 {
6101 const unsigned char *src = source, *src_end = src + src_bytes;
6102 unsigned char c;
6103 int total = 0;
6104 int eol_seen = EOL_SEEN_NONE;
6105
6106 if ((1 << category) & CATEGORY_MASK_UTF_16)
6107 {
6108 int msb, lsb;
6109
6110 msb = category == (coding_category_utf_16_le
6111 | coding_category_utf_16_le_nosig);
6112 lsb = 1 - msb;
6113
6114 while (src + 1 < src_end)
6115 {
6116 c = src[lsb];
6117 if (src[msb] == 0 && (c == '\n' || c == '\r'))
6118 {
6119 int this_eol;
6120
6121 if (c == '\n')
6122 this_eol = EOL_SEEN_LF;
6123 else if (src + 3 >= src_end
6124 || src[msb + 2] != 0
6125 || src[lsb + 2] != '\n')
6126 this_eol = EOL_SEEN_CR;
6127 else
6128 {
6129 this_eol = EOL_SEEN_CRLF;
6130 src += 2;
6131 }
6132
6133 if (eol_seen == EOL_SEEN_NONE)
6134 /* This is the first end-of-line. */
6135 eol_seen = this_eol;
6136 else if (eol_seen != this_eol)
6137 {
6138 /* The found type is different from what found before.
6139 Allow for stray ^M characters in DOS EOL files. */
6140 if ((eol_seen == EOL_SEEN_CR && this_eol == EOL_SEEN_CRLF)
6141 || (eol_seen == EOL_SEEN_CRLF
6142 && this_eol == EOL_SEEN_CR))
6143 eol_seen = EOL_SEEN_CRLF;
6144 else
6145 {
6146 eol_seen = EOL_SEEN_LF;
6147 break;
6148 }
6149 }
6150 if (++total == MAX_EOL_CHECK_COUNT)
6151 break;
6152 }
6153 src += 2;
6154 }
6155 }
6156 else
6157 while (src < src_end)
6158 {
6159 c = *src++;
6160 if (c == '\n' || c == '\r')
6161 {
6162 int this_eol;
6163
6164 if (c == '\n')
6165 this_eol = EOL_SEEN_LF;
6166 else if (src >= src_end || *src != '\n')
6167 this_eol = EOL_SEEN_CR;
6168 else
6169 this_eol = EOL_SEEN_CRLF, src++;
6170
6171 if (eol_seen == EOL_SEEN_NONE)
6172 /* This is the first end-of-line. */
6173 eol_seen = this_eol;
6174 else if (eol_seen != this_eol)
6175 {
6176 /* The found type is different from what found before.
6177 Allow for stray ^M characters in DOS EOL files. */
6178 if ((eol_seen == EOL_SEEN_CR && this_eol == EOL_SEEN_CRLF)
6179 || (eol_seen == EOL_SEEN_CRLF && this_eol == EOL_SEEN_CR))
6180 eol_seen = EOL_SEEN_CRLF;
6181 else
6182 {
6183 eol_seen = EOL_SEEN_LF;
6184 break;
6185 }
6186 }
6187 if (++total == MAX_EOL_CHECK_COUNT)
6188 break;
6189 }
6190 }
6191 return eol_seen;
6192 }
6193
6194
6195 static Lisp_Object
6196 adjust_coding_eol_type (struct coding_system *coding, int eol_seen)
6197 {
6198 Lisp_Object eol_type;
6199
6200 eol_type = CODING_ID_EOL_TYPE (coding->id);
6201 if (eol_seen & EOL_SEEN_LF)
6202 {
6203 coding->id = CODING_SYSTEM_ID (AREF (eol_type, 0));
6204 eol_type = Qunix;
6205 }
6206 else if (eol_seen & EOL_SEEN_CRLF)
6207 {
6208 coding->id = CODING_SYSTEM_ID (AREF (eol_type, 1));
6209 eol_type = Qdos;
6210 }
6211 else if (eol_seen & EOL_SEEN_CR)
6212 {
6213 coding->id = CODING_SYSTEM_ID (AREF (eol_type, 2));
6214 eol_type = Qmac;
6215 }
6216 return eol_type;
6217 }
6218
6219 /* Detect how a text specified in CODING is encoded. If a coding
6220 system is detected, update fields of CODING by the detected coding
6221 system. */
6222
6223 static void
6224 detect_coding (struct coding_system *coding)
6225 {
6226 const unsigned char *src, *src_end;
6227 int saved_mode = coding->mode;
6228
6229 coding->consumed = coding->consumed_char = 0;
6230 coding->produced = coding->produced_char = 0;
6231 coding_set_source (coding);
6232
6233 src_end = coding->source + coding->src_bytes;
6234 coding->head_ascii = 0;
6235
6236 /* If we have not yet decided the text encoding type, detect it
6237 now. */
6238 if (EQ (CODING_ATTR_TYPE (CODING_ID_ATTRS (coding->id)), Qundecided))
6239 {
6240 int c, i;
6241 struct coding_detection_info detect_info;
6242 int null_byte_found = 0, eight_bit_found = 0;
6243
6244 detect_info.checked = detect_info.found = detect_info.rejected = 0;
6245 for (src = coding->source; src < src_end; src++)
6246 {
6247 c = *src;
6248 if (c & 0x80)
6249 {
6250 eight_bit_found = 1;
6251 if (null_byte_found)
6252 break;
6253 }
6254 else if (c < 0x20)
6255 {
6256 if ((c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)
6257 && ! inhibit_iso_escape_detection
6258 && ! detect_info.checked)
6259 {
6260 if (detect_coding_iso_2022 (coding, &detect_info))
6261 {
6262 /* We have scanned the whole data. */
6263 if (! (detect_info.rejected & CATEGORY_MASK_ISO_7_ELSE))
6264 {
6265 /* We didn't find an 8-bit code. We may
6266 have found a null-byte, but it's very
6267 rare that a binary file conforms to
6268 ISO-2022. */
6269 src = src_end;
6270 coding->head_ascii = src - coding->source;
6271 }
6272 detect_info.rejected |= ~CATEGORY_MASK_ISO_ESCAPE;
6273 break;
6274 }
6275 }
6276 else if (! c && !inhibit_null_byte_detection)
6277 {
6278 null_byte_found = 1;
6279 if (eight_bit_found)
6280 break;
6281 }
6282 if (! eight_bit_found)
6283 coding->head_ascii++;
6284 }
6285 else if (! eight_bit_found)
6286 coding->head_ascii++;
6287 }
6288
6289 if (null_byte_found || eight_bit_found
6290 || coding->head_ascii < coding->src_bytes
6291 || detect_info.found)
6292 {
6293 enum coding_category category;
6294 struct coding_system *this;
6295
6296 if (coding->head_ascii == coding->src_bytes)
6297 /* As all bytes are 7-bit, we can ignore non-ISO-2022 codings. */
6298 for (i = 0; i < coding_category_raw_text; i++)
6299 {
6300 category = coding_priorities[i];
6301 this = coding_categories + category;
6302 if (detect_info.found & (1 << category))
6303 break;
6304 }
6305 else
6306 {
6307 if (null_byte_found)
6308 {
6309 detect_info.checked |= ~CATEGORY_MASK_UTF_16;
6310 detect_info.rejected |= ~CATEGORY_MASK_UTF_16;
6311 }
6312 for (i = 0; i < coding_category_raw_text; i++)
6313 {
6314 category = coding_priorities[i];
6315 this = coding_categories + category;
6316 if (this->id < 0)
6317 {
6318 /* No coding system of this category is defined. */
6319 detect_info.rejected |= (1 << category);
6320 }
6321 else if (category >= coding_category_raw_text)
6322 continue;
6323 else if (detect_info.checked & (1 << category))
6324 {
6325 if (detect_info.found & (1 << category))
6326 break;
6327 }
6328 else if ((*(this->detector)) (coding, &detect_info)
6329 && detect_info.found & (1 << category))
6330 {
6331 if (category == coding_category_utf_16_auto)
6332 {
6333 if (detect_info.found & CATEGORY_MASK_UTF_16_LE)
6334 category = coding_category_utf_16_le;
6335 else
6336 category = coding_category_utf_16_be;
6337 }
6338 break;
6339 }
6340 }
6341 }
6342
6343 if (i < coding_category_raw_text)
6344 setup_coding_system (CODING_ID_NAME (this->id), coding);
6345 else if (null_byte_found)
6346 setup_coding_system (Qno_conversion, coding);
6347 else if ((detect_info.rejected & CATEGORY_MASK_ANY)
6348 == CATEGORY_MASK_ANY)
6349 setup_coding_system (Qraw_text, coding);
6350 else if (detect_info.rejected)
6351 for (i = 0; i < coding_category_raw_text; i++)
6352 if (! (detect_info.rejected & (1 << coding_priorities[i])))
6353 {
6354 this = coding_categories + coding_priorities[i];
6355 setup_coding_system (CODING_ID_NAME (this->id), coding);
6356 break;
6357 }
6358 }
6359 }
6360 else if (XINT (CODING_ATTR_CATEGORY (CODING_ID_ATTRS (coding->id)))
6361 == coding_category_utf_8_auto)
6362 {
6363 Lisp_Object coding_systems;
6364 struct coding_detection_info detect_info;
6365
6366 coding_systems
6367 = AREF (CODING_ID_ATTRS (coding->id), coding_attr_utf_bom);
6368 detect_info.found = detect_info.rejected = 0;
6369 coding->head_ascii = 0;
6370 if (CONSP (coding_systems)
6371 && detect_coding_utf_8 (coding, &detect_info))
6372 {
6373 if (detect_info.found & CATEGORY_MASK_UTF_8_SIG)
6374 setup_coding_system (XCAR (coding_systems), coding);
6375 else
6376 setup_coding_system (XCDR (coding_systems), coding);
6377 }
6378 }
6379 else if (XINT (CODING_ATTR_CATEGORY (CODING_ID_ATTRS (coding->id)))
6380 == coding_category_utf_16_auto)
6381 {
6382 Lisp_Object coding_systems;
6383 struct coding_detection_info detect_info;
6384
6385 coding_systems
6386 = AREF (CODING_ID_ATTRS (coding->id), coding_attr_utf_bom);
6387 detect_info.found = detect_info.rejected = 0;
6388 coding->head_ascii = 0;
6389 if (CONSP (coding_systems)
6390 && detect_coding_utf_16 (coding, &detect_info))
6391 {
6392 if (detect_info.found & CATEGORY_MASK_UTF_16_LE)
6393 setup_coding_system (XCAR (coding_systems), coding);
6394 else if (detect_info.found & CATEGORY_MASK_UTF_16_BE)
6395 setup_coding_system (XCDR (coding_systems), coding);
6396 }
6397 }
6398 coding->mode = saved_mode;
6399 }
6400
6401
6402 static void
6403 decode_eol (struct coding_system *coding)
6404 {
6405 Lisp_Object eol_type;
6406 unsigned char *p, *pbeg, *pend;
6407
6408 eol_type = CODING_ID_EOL_TYPE (coding->id);
6409 if (EQ (eol_type, Qunix) || inhibit_eol_conversion)
6410 return;
6411
6412 if (NILP (coding->dst_object))
6413 pbeg = coding->destination;
6414 else
6415 pbeg = BYTE_POS_ADDR (coding->dst_pos_byte);
6416 pend = pbeg + coding->produced;
6417
6418 if (VECTORP (eol_type))
6419 {
6420 int eol_seen = EOL_SEEN_NONE;
6421
6422 for (p = pbeg; p < pend; p++)
6423 {
6424 if (*p == '\n')
6425 eol_seen |= EOL_SEEN_LF;
6426 else if (*p == '\r')
6427 {
6428 if (p + 1 < pend && *(p + 1) == '\n')
6429 {
6430 eol_seen |= EOL_SEEN_CRLF;
6431 p++;
6432 }
6433 else
6434 eol_seen |= EOL_SEEN_CR;
6435 }
6436 }
6437 /* Handle DOS-style EOLs in a file with stray ^M characters. */
6438 if ((eol_seen & EOL_SEEN_CRLF) != 0
6439 && (eol_seen & EOL_SEEN_CR) != 0
6440 && (eol_seen & EOL_SEEN_LF) == 0)
6441 eol_seen = EOL_SEEN_CRLF;
6442 else if (eol_seen != EOL_SEEN_NONE
6443 && eol_seen != EOL_SEEN_LF
6444 && eol_seen != EOL_SEEN_CRLF
6445 && eol_seen != EOL_SEEN_CR)
6446 eol_seen = EOL_SEEN_LF;
6447 if (eol_seen != EOL_SEEN_NONE)
6448 eol_type = adjust_coding_eol_type (coding, eol_seen);
6449 }
6450
6451 if (EQ (eol_type, Qmac))
6452 {
6453 for (p = pbeg; p < pend; p++)
6454 if (*p == '\r')
6455 *p = '\n';
6456 }
6457 else if (EQ (eol_type, Qdos))
6458 {
6459 EMACS_INT n = 0;
6460
6461 if (NILP (coding->dst_object))
6462 {
6463 /* Start deleting '\r' from the tail to minimize the memory
6464 movement. */
6465 for (p = pend - 2; p >= pbeg; p--)
6466 if (*p == '\r')
6467 {
6468 memmove (p, p + 1, pend-- - p - 1);
6469 n++;
6470 }
6471 }
6472 else
6473 {
6474 EMACS_INT pos_byte = coding->dst_pos_byte;
6475 EMACS_INT pos = coding->dst_pos;
6476 EMACS_INT pos_end = pos + coding->produced_char - 1;
6477
6478 while (pos < pos_end)
6479 {
6480 p = BYTE_POS_ADDR (pos_byte);
6481 if (*p == '\r' && p[1] == '\n')
6482 {
6483 del_range_2 (pos, pos_byte, pos + 1, pos_byte + 1, 0);
6484 n++;
6485 pos_end--;
6486 }
6487 pos++;
6488 if (coding->dst_multibyte)
6489 pos_byte += BYTES_BY_CHAR_HEAD (*p);
6490 else
6491 pos_byte++;
6492 }
6493 }
6494 coding->produced -= n;
6495 coding->produced_char -= n;
6496 }
6497 }
6498
6499
6500 /* Return a translation table (or list of them) from coding system
6501 attribute vector ATTRS for encoding (ENCODEP is nonzero) or
6502 decoding (ENCODEP is zero). */
6503
6504 static Lisp_Object
6505 get_translation_table (Lisp_Object attrs, int encodep, int *max_lookup)
6506 {
6507 Lisp_Object standard, translation_table;
6508 Lisp_Object val;
6509
6510 if (NILP (Venable_character_translation))
6511 {
6512 if (max_lookup)
6513 *max_lookup = 0;
6514 return Qnil;
6515 }
6516 if (encodep)
6517 translation_table = CODING_ATTR_ENCODE_TBL (attrs),
6518 standard = Vstandard_translation_table_for_encode;
6519 else
6520 translation_table = CODING_ATTR_DECODE_TBL (attrs),
6521 standard = Vstandard_translation_table_for_decode;
6522 if (NILP (translation_table))
6523 translation_table = standard;
6524 else
6525 {
6526 if (SYMBOLP (translation_table))
6527 translation_table = Fget (translation_table, Qtranslation_table);
6528 else if (CONSP (translation_table))
6529 {
6530 translation_table = Fcopy_sequence (translation_table);
6531 for (val = translation_table; CONSP (val); val = XCDR (val))
6532 if (SYMBOLP (XCAR (val)))
6533 XSETCAR (val, Fget (XCAR (val), Qtranslation_table));
6534 }
6535 if (CHAR_TABLE_P (standard))
6536 {
6537 if (CONSP (translation_table))
6538 translation_table = nconc2 (translation_table,
6539 Fcons (standard, Qnil));
6540 else
6541 translation_table = Fcons (translation_table,
6542 Fcons (standard, Qnil));
6543 }
6544 }
6545
6546 if (max_lookup)
6547 {
6548 *max_lookup = 1;
6549 if (CHAR_TABLE_P (translation_table)
6550 && CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (translation_table)) > 1)
6551 {
6552 val = XCHAR_TABLE (translation_table)->extras[1];
6553 if (NATNUMP (val) && *max_lookup < XFASTINT (val))
6554 *max_lookup = XFASTINT (val);
6555 }
6556 else if (CONSP (translation_table))
6557 {
6558 Lisp_Object tail;
6559
6560 for (tail = translation_table; CONSP (tail); tail = XCDR (tail))
6561 if (CHAR_TABLE_P (XCAR (tail))
6562 && CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (XCAR (tail))) > 1)
6563 {
6564 Lisp_Object tailval = XCHAR_TABLE (XCAR (tail))->extras[1];
6565 if (NATNUMP (tailval) && *max_lookup < XFASTINT (tailval))
6566 *max_lookup = XFASTINT (tailval);
6567 }
6568 }
6569 }
6570 return translation_table;
6571 }
6572
6573 #define LOOKUP_TRANSLATION_TABLE(table, c, trans) \
6574 do { \
6575 trans = Qnil; \
6576 if (CHAR_TABLE_P (table)) \
6577 { \
6578 trans = CHAR_TABLE_REF (table, c); \
6579 if (CHARACTERP (trans)) \
6580 c = XFASTINT (trans), trans = Qnil; \
6581 } \
6582 else if (CONSP (table)) \
6583 { \
6584 Lisp_Object tail; \
6585 \
6586 for (tail = table; CONSP (tail); tail = XCDR (tail)) \
6587 if (CHAR_TABLE_P (XCAR (tail))) \
6588 { \
6589 trans = CHAR_TABLE_REF (XCAR (tail), c); \
6590 if (CHARACTERP (trans)) \
6591 c = XFASTINT (trans), trans = Qnil; \
6592 else if (! NILP (trans)) \
6593 break; \
6594 } \
6595 } \
6596 } while (0)
6597
6598
6599 /* Return a translation of character(s) at BUF according to TRANS.
6600 TRANS is TO-CHAR or ((FROM . TO) ...) where
6601 FROM = [FROM-CHAR ...], TO is TO-CHAR or [TO-CHAR ...].
6602 The return value is TO-CHAR or ([FROM-CHAR ...] . TO) if a
6603 translation is found, and Qnil if not found..
6604 If BUF is too short to lookup characters in FROM, return Qt. */
6605
6606 static Lisp_Object
6607 get_translation (Lisp_Object trans, int *buf, int *buf_end)
6608 {
6609
6610 if (INTEGERP (trans))
6611 return trans;
6612 for (; CONSP (trans); trans = XCDR (trans))
6613 {
6614 Lisp_Object val = XCAR (trans);
6615 Lisp_Object from = XCAR (val);
6616 int len = ASIZE (from);
6617 int i;
6618
6619 for (i = 0; i < len; i++)
6620 {
6621 if (buf + i == buf_end)
6622 return Qt;
6623 if (XINT (AREF (from, i)) != buf[i])
6624 break;
6625 }
6626 if (i == len)
6627 return val;
6628 }
6629 return Qnil;
6630 }
6631
6632
6633 static int
6634 produce_chars (struct coding_system *coding, Lisp_Object translation_table,
6635 int last_block)
6636 {
6637 unsigned char *dst = coding->destination + coding->produced;
6638 unsigned char *dst_end = coding->destination + coding->dst_bytes;
6639 EMACS_INT produced;
6640 EMACS_INT produced_chars = 0;
6641 int carryover = 0;
6642
6643 if (! coding->chars_at_source)
6644 {
6645 /* Source characters are in coding->charbuf. */
6646 int *buf = coding->charbuf;
6647 int *buf_end = buf + coding->charbuf_used;
6648
6649 if (EQ (coding->src_object, coding->dst_object))
6650 {
6651 coding_set_source (coding);
6652 dst_end = ((unsigned char *) coding->source) + coding->consumed;
6653 }
6654
6655 while (buf < buf_end)
6656 {
6657 int c = *buf, i;
6658
6659 if (c >= 0)
6660 {
6661 EMACS_INT from_nchars = 1, to_nchars = 1;
6662 Lisp_Object trans = Qnil;
6663
6664 LOOKUP_TRANSLATION_TABLE (translation_table, c, trans);
6665 if (! NILP (trans))
6666 {
6667 trans = get_translation (trans, buf, buf_end);
6668 if (INTEGERP (trans))
6669 c = XINT (trans);
6670 else if (CONSP (trans))
6671 {
6672 from_nchars = ASIZE (XCAR (trans));
6673 trans = XCDR (trans);
6674 if (INTEGERP (trans))
6675 c = XINT (trans);
6676 else
6677 {
6678 to_nchars = ASIZE (trans);
6679 c = XINT (AREF (trans, 0));
6680 }
6681 }
6682 else if (EQ (trans, Qt) && ! last_block)
6683 break;
6684 }
6685
6686 if (dst + MAX_MULTIBYTE_LENGTH * to_nchars > dst_end)
6687 {
6688 dst = alloc_destination (coding,
6689 buf_end - buf
6690 + MAX_MULTIBYTE_LENGTH * to_nchars,
6691 dst);
6692 if (EQ (coding->src_object, coding->dst_object))
6693 {
6694 coding_set_source (coding);
6695 dst_end = (((unsigned char *) coding->source)
6696 + coding->consumed);
6697 }
6698 else
6699 dst_end = coding->destination + coding->dst_bytes;
6700 }
6701
6702 for (i = 0; i < to_nchars; i++)
6703 {
6704 if (i > 0)
6705 c = XINT (AREF (trans, i));
6706 if (coding->dst_multibyte
6707 || ! CHAR_BYTE8_P (c))
6708 CHAR_STRING_ADVANCE_NO_UNIFY (c, dst);
6709 else
6710 *dst++ = CHAR_TO_BYTE8 (c);
6711 }
6712 produced_chars += to_nchars;
6713 buf += from_nchars;
6714 }
6715 else
6716 /* This is an annotation datum. (-C) is the length. */
6717 buf += -c;
6718 }
6719 carryover = buf_end - buf;
6720 }
6721 else
6722 {
6723 /* Source characters are at coding->source. */
6724 const unsigned char *src = coding->source;
6725 const unsigned char *src_end = src + coding->consumed;
6726
6727 if (EQ (coding->dst_object, coding->src_object))
6728 dst_end = (unsigned char *) src;
6729 if (coding->src_multibyte != coding->dst_multibyte)
6730 {
6731 if (coding->src_multibyte)
6732 {
6733 int multibytep = 1;
6734 EMACS_INT consumed_chars = 0;
6735
6736 while (1)
6737 {
6738 const unsigned char *src_base = src;
6739 int c;
6740
6741 ONE_MORE_BYTE (c);
6742 if (dst == dst_end)
6743 {
6744 if (EQ (coding->src_object, coding->dst_object))
6745 dst_end = (unsigned char *) src;
6746 if (dst == dst_end)
6747 {
6748 EMACS_INT offset = src - coding->source;
6749
6750 dst = alloc_destination (coding, src_end - src + 1,
6751 dst);
6752 dst_end = coding->destination + coding->dst_bytes;
6753 coding_set_source (coding);
6754 src = coding->source + offset;
6755 src_end = coding->source + coding->src_bytes;
6756 if (EQ (coding->src_object, coding->dst_object))
6757 dst_end = (unsigned char *) src;
6758 }
6759 }
6760 *dst++ = c;
6761 produced_chars++;
6762 }
6763 no_more_source:
6764 ;
6765 }
6766 else
6767 while (src < src_end)
6768 {
6769 int multibytep = 1;
6770 int c = *src++;
6771
6772 if (dst >= dst_end - 1)
6773 {
6774 if (EQ (coding->src_object, coding->dst_object))
6775 dst_end = (unsigned char *) src;
6776 if (dst >= dst_end - 1)
6777 {
6778 EMACS_INT offset = src - coding->source;
6779 EMACS_INT more_bytes;
6780
6781 if (EQ (coding->src_object, coding->dst_object))
6782 more_bytes = ((src_end - src) / 2) + 2;
6783 else
6784 more_bytes = src_end - src + 2;
6785 dst = alloc_destination (coding, more_bytes, dst);
6786 dst_end = coding->destination + coding->dst_bytes;
6787 coding_set_source (coding);
6788 src = coding->source + offset;
6789 src_end = coding->source + coding->src_bytes;
6790 if (EQ (coding->src_object, coding->dst_object))
6791 dst_end = (unsigned char *) src;
6792 }
6793 }
6794 EMIT_ONE_BYTE (c);
6795 }
6796 }
6797 else
6798 {
6799 if (!EQ (coding->src_object, coding->dst_object))
6800 {
6801 EMACS_INT require = coding->src_bytes - coding->dst_bytes;
6802
6803 if (require > 0)
6804 {
6805 EMACS_INT offset = src - coding->source;
6806
6807 dst = alloc_destination (coding, require, dst);
6808 coding_set_source (coding);
6809 src = coding->source + offset;
6810 src_end = coding->source + coding->src_bytes;
6811 }
6812 }
6813 produced_chars = coding->consumed_char;
6814 while (src < src_end)
6815 *dst++ = *src++;
6816 }
6817 }
6818
6819 produced = dst - (coding->destination + coding->produced);
6820 if (BUFFERP (coding->dst_object) && produced_chars > 0)
6821 insert_from_gap (produced_chars, produced);
6822 coding->produced += produced;
6823 coding->produced_char += produced_chars;
6824 return carryover;
6825 }
6826
6827 /* Compose text in CODING->object according to the annotation data at
6828 CHARBUF. CHARBUF is an array:
6829 [ -LENGTH ANNOTATION_MASK NCHARS NBYTES METHOD [ COMPONENTS... ] ]
6830 */
6831
6832 static INLINE void
6833 produce_composition (struct coding_system *coding, int *charbuf, EMACS_INT pos)
6834 {
6835 int len;
6836 EMACS_INT to;
6837 enum composition_method method;
6838 Lisp_Object components;
6839
6840 len = -charbuf[0] - MAX_ANNOTATION_LENGTH;
6841 to = pos + charbuf[2];
6842 method = (enum composition_method) (charbuf[4]);
6843
6844 if (method == COMPOSITION_RELATIVE)
6845 components = Qnil;
6846 else
6847 {
6848 Lisp_Object args[MAX_COMPOSITION_COMPONENTS * 2 - 1];
6849 int i, j;
6850
6851 if (method == COMPOSITION_WITH_RULE)
6852 len = charbuf[2] * 3 - 2;
6853 charbuf += MAX_ANNOTATION_LENGTH;
6854 /* charbuf = [ CHRA ... CHAR] or [ CHAR -2 RULE ... CHAR ] */
6855 for (i = j = 0; i < len && charbuf[i] != -1; i++, j++)
6856 {
6857 if (charbuf[i] >= 0)
6858 args[j] = make_number (charbuf[i]);
6859 else
6860 {
6861 i++;
6862 args[j] = make_number (charbuf[i] % 0x100);
6863 }
6864 }
6865 components = (i == j ? Fstring (j, args) : Fvector (j, args));
6866 }
6867 compose_text (pos, to, components, Qnil, coding->dst_object);
6868 }
6869
6870
6871 /* Put `charset' property on text in CODING->object according to
6872 the annotation data at CHARBUF. CHARBUF is an array:
6873 [ -LENGTH ANNOTATION_MASK NCHARS CHARSET-ID ]
6874 */
6875
6876 static INLINE void
6877 produce_charset (struct coding_system *coding, int *charbuf, EMACS_INT pos)
6878 {
6879 EMACS_INT from = pos - charbuf[2];
6880 struct charset *charset = CHARSET_FROM_ID (charbuf[3]);
6881
6882 Fput_text_property (make_number (from), make_number (pos),
6883 Qcharset, CHARSET_NAME (charset),
6884 coding->dst_object);
6885 }
6886
6887
6888 #define CHARBUF_SIZE 0x4000
6889
6890 #define ALLOC_CONVERSION_WORK_AREA(coding) \
6891 do { \
6892 int size = CHARBUF_SIZE; \
6893 \
6894 coding->charbuf = NULL; \
6895 while (size > 1024) \
6896 { \
6897 coding->charbuf = (int *) alloca (sizeof (int) * size); \
6898 if (coding->charbuf) \
6899 break; \
6900 size >>= 1; \
6901 } \
6902 if (! coding->charbuf) \
6903 { \
6904 record_conversion_result (coding, CODING_RESULT_INSUFFICIENT_MEM); \
6905 return coding->result; \
6906 } \
6907 coding->charbuf_size = size; \
6908 } while (0)
6909
6910
6911 static void
6912 produce_annotation (struct coding_system *coding, EMACS_INT pos)
6913 {
6914 int *charbuf = coding->charbuf;
6915 int *charbuf_end = charbuf + coding->charbuf_used;
6916
6917 if (NILP (coding->dst_object))
6918 return;
6919
6920 while (charbuf < charbuf_end)
6921 {
6922 if (*charbuf >= 0)
6923 pos++, charbuf++;
6924 else
6925 {
6926 int len = -*charbuf;
6927
6928 if (len > 2)
6929 switch (charbuf[1])
6930 {
6931 case CODING_ANNOTATE_COMPOSITION_MASK:
6932 produce_composition (coding, charbuf, pos);
6933 break;
6934 case CODING_ANNOTATE_CHARSET_MASK:
6935 produce_charset (coding, charbuf, pos);
6936 break;
6937 }
6938 charbuf += len;
6939 }
6940 }
6941 }
6942
6943 /* Decode the data at CODING->src_object into CODING->dst_object.
6944 CODING->src_object is a buffer, a string, or nil.
6945 CODING->dst_object is a buffer.
6946
6947 If CODING->src_object is a buffer, it must be the current buffer.
6948 In this case, if CODING->src_pos is positive, it is a position of
6949 the source text in the buffer, otherwise, the source text is in the
6950 gap area of the buffer, and CODING->src_pos specifies the offset of
6951 the text from GPT (which must be the same as PT). If this is the
6952 same buffer as CODING->dst_object, CODING->src_pos must be
6953 negative.
6954
6955 If CODING->src_object is a string, CODING->src_pos is an index to
6956 that string.
6957
6958 If CODING->src_object is nil, CODING->source must already point to
6959 the non-relocatable memory area. In this case, CODING->src_pos is
6960 an offset from CODING->source.
6961
6962 The decoded data is inserted at the current point of the buffer
6963 CODING->dst_object.
6964 */
6965
6966 static int
6967 decode_coding (struct coding_system *coding)
6968 {
6969 Lisp_Object attrs;
6970 Lisp_Object undo_list;
6971 Lisp_Object translation_table;
6972 struct ccl_spec cclspec;
6973 int carryover;
6974 int i;
6975
6976 if (BUFFERP (coding->src_object)
6977 && coding->src_pos > 0
6978 && coding->src_pos < GPT
6979 && coding->src_pos + coding->src_chars > GPT)
6980 move_gap_both (coding->src_pos, coding->src_pos_byte);
6981
6982 undo_list = Qt;
6983 if (BUFFERP (coding->dst_object))
6984 {
6985 if (current_buffer != XBUFFER (coding->dst_object))
6986 set_buffer_internal (XBUFFER (coding->dst_object));
6987 if (GPT != PT)
6988 move_gap_both (PT, PT_BYTE);
6989 undo_list = BVAR (current_buffer, undo_list);
6990 BVAR (current_buffer, undo_list) = Qt;
6991 }
6992
6993 coding->consumed = coding->consumed_char = 0;
6994 coding->produced = coding->produced_char = 0;
6995 coding->chars_at_source = 0;
6996 record_conversion_result (coding, CODING_RESULT_SUCCESS);
6997 coding->errors = 0;
6998
6999 ALLOC_CONVERSION_WORK_AREA (coding);
7000
7001 attrs = CODING_ID_ATTRS (coding->id);
7002 translation_table = get_translation_table (attrs, 0, NULL);
7003
7004 carryover = 0;
7005 if (coding->decoder == decode_coding_ccl)
7006 {
7007 coding->spec.ccl = &cclspec;
7008 setup_ccl_program (&cclspec.ccl, CODING_CCL_DECODER (coding));
7009 }
7010 do
7011 {
7012 EMACS_INT pos = coding->dst_pos + coding->produced_char;
7013
7014 coding_set_source (coding);
7015 coding->annotated = 0;
7016 coding->charbuf_used = carryover;
7017 (*(coding->decoder)) (coding);
7018 coding_set_destination (coding);
7019 carryover = produce_chars (coding, translation_table, 0);
7020 if (coding->annotated)
7021 produce_annotation (coding, pos);
7022 for (i = 0; i < carryover; i++)
7023 coding->charbuf[i]
7024 = coding->charbuf[coding->charbuf_used - carryover + i];
7025 }
7026 while (coding->result == CODING_RESULT_INSUFFICIENT_DST
7027 || (coding->consumed < coding->src_bytes
7028 && (coding->result == CODING_RESULT_SUCCESS
7029 || coding->result == CODING_RESULT_INVALID_SRC)));
7030
7031 if (carryover > 0)
7032 {
7033 coding_set_destination (coding);
7034 coding->charbuf_used = carryover;
7035 produce_chars (coding, translation_table, 1);
7036 }
7037
7038 coding->carryover_bytes = 0;
7039 if (coding->consumed < coding->src_bytes)
7040 {
7041 int nbytes = coding->src_bytes - coding->consumed;
7042 const unsigned char *src;
7043
7044 coding_set_source (coding);
7045 coding_set_destination (coding);
7046 src = coding->source + coding->consumed;
7047
7048 if (coding->mode & CODING_MODE_LAST_BLOCK)
7049 {
7050 /* Flush out unprocessed data as binary chars. We are sure
7051 that the number of data is less than the size of
7052 coding->charbuf. */
7053 coding->charbuf_used = 0;
7054 coding->chars_at_source = 0;
7055
7056 while (nbytes-- > 0)
7057 {
7058 int c = *src++;
7059
7060 if (c & 0x80)
7061 c = BYTE8_TO_CHAR (c);
7062 coding->charbuf[coding->charbuf_used++] = c;
7063 }
7064 produce_chars (coding, Qnil, 1);
7065 }
7066 else
7067 {
7068 /* Record unprocessed bytes in coding->carryover. We are
7069 sure that the number of data is less than the size of
7070 coding->carryover. */
7071 unsigned char *p = coding->carryover;
7072
7073 if (nbytes > sizeof coding->carryover)
7074 nbytes = sizeof coding->carryover;
7075 coding->carryover_bytes = nbytes;
7076 while (nbytes-- > 0)
7077 *p++ = *src++;
7078 }
7079 coding->consumed = coding->src_bytes;
7080 }
7081
7082 if (! EQ (CODING_ID_EOL_TYPE (coding->id), Qunix)
7083 && !inhibit_eol_conversion)
7084 decode_eol (coding);
7085 if (BUFFERP (coding->dst_object))
7086 {
7087 BVAR (current_buffer, undo_list) = undo_list;
7088 record_insert (coding->dst_pos, coding->produced_char);
7089 }
7090 return coding->result;
7091 }
7092
7093
7094 /* Extract an annotation datum from a composition starting at POS and
7095 ending before LIMIT of CODING->src_object (buffer or string), store
7096 the data in BUF, set *STOP to a starting position of the next
7097 composition (if any) or to LIMIT, and return the address of the
7098 next element of BUF.
7099
7100 If such an annotation is not found, set *STOP to a starting
7101 position of a composition after POS (if any) or to LIMIT, and
7102 return BUF. */
7103
7104 static INLINE int *
7105 handle_composition_annotation (EMACS_INT pos, EMACS_INT limit,
7106 struct coding_system *coding, int *buf,
7107 EMACS_INT *stop)
7108 {
7109 EMACS_INT start, end;
7110 Lisp_Object prop;
7111
7112 if (! find_composition (pos, limit, &start, &end, &prop, coding->src_object)
7113 || end > limit)
7114 *stop = limit;
7115 else if (start > pos)
7116 *stop = start;
7117 else
7118 {
7119 if (start == pos)
7120 {
7121 /* We found a composition. Store the corresponding
7122 annotation data in BUF. */
7123 int *head = buf;
7124 enum composition_method method = COMPOSITION_METHOD (prop);
7125 int nchars = COMPOSITION_LENGTH (prop);
7126
7127 ADD_COMPOSITION_DATA (buf, nchars, 0, method);
7128 if (method != COMPOSITION_RELATIVE)
7129 {
7130 Lisp_Object components;
7131 int len, i, i_byte;
7132
7133 components = COMPOSITION_COMPONENTS (prop);
7134 if (VECTORP (components))
7135 {
7136 len = ASIZE (components);
7137 for (i = 0; i < len; i++)
7138 *buf++ = XINT (AREF (components, i));
7139 }
7140 else if (STRINGP (components))
7141 {
7142 len = SCHARS (components);
7143 i = i_byte = 0;
7144 while (i < len)
7145 {
7146 FETCH_STRING_CHAR_ADVANCE (*buf, components, i, i_byte);
7147 buf++;
7148 }
7149 }
7150 else if (INTEGERP (components))
7151 {
7152 len = 1;
7153 *buf++ = XINT (components);
7154 }
7155 else if (CONSP (components))
7156 {
7157 for (len = 0; CONSP (components);
7158 len++, components = XCDR (components))
7159 *buf++ = XINT (XCAR (components));
7160 }
7161 else
7162 abort ();
7163 *head -= len;
7164 }
7165 }
7166
7167 if (find_composition (end, limit, &start, &end, &prop,
7168 coding->src_object)
7169 && end <= limit)
7170 *stop = start;
7171 else
7172 *stop = limit;
7173 }
7174 return buf;
7175 }
7176
7177
7178 /* Extract an annotation datum from a text property `charset' at POS of
7179 CODING->src_object (buffer of string), store the data in BUF, set
7180 *STOP to the position where the value of `charset' property changes
7181 (limiting by LIMIT), and return the address of the next element of
7182 BUF.
7183
7184 If the property value is nil, set *STOP to the position where the
7185 property value is non-nil (limiting by LIMIT), and return BUF. */
7186
7187 static INLINE int *
7188 handle_charset_annotation (EMACS_INT pos, EMACS_INT limit,
7189 struct coding_system *coding, int *buf,
7190 EMACS_INT *stop)
7191 {
7192 Lisp_Object val, next;
7193 int id;
7194
7195 val = Fget_text_property (make_number (pos), Qcharset, coding->src_object);
7196 if (! NILP (val) && CHARSETP (val))
7197 id = XINT (CHARSET_SYMBOL_ID (val));
7198 else
7199 id = -1;
7200 ADD_CHARSET_DATA (buf, 0, id);
7201 next = Fnext_single_property_change (make_number (pos), Qcharset,
7202 coding->src_object,
7203 make_number (limit));
7204 *stop = XINT (next);
7205 return buf;
7206 }
7207
7208
7209 static void
7210 consume_chars (struct coding_system *coding, Lisp_Object translation_table,
7211 int max_lookup)
7212 {
7213 int *buf = coding->charbuf;
7214 int *buf_end = coding->charbuf + coding->charbuf_size;
7215 const unsigned char *src = coding->source + coding->consumed;
7216 const unsigned char *src_end = coding->source + coding->src_bytes;
7217 EMACS_INT pos = coding->src_pos + coding->consumed_char;
7218 EMACS_INT end_pos = coding->src_pos + coding->src_chars;
7219 int multibytep = coding->src_multibyte;
7220 Lisp_Object eol_type;
7221 int c;
7222 EMACS_INT stop, stop_composition, stop_charset;
7223 int *lookup_buf = NULL;
7224
7225 if (! NILP (translation_table))
7226 lookup_buf = alloca (sizeof (int) * max_lookup);
7227
7228 eol_type = inhibit_eol_conversion ? Qunix : CODING_ID_EOL_TYPE (coding->id);
7229 if (VECTORP (eol_type))
7230 eol_type = Qunix;
7231
7232 /* Note: composition handling is not yet implemented. */
7233 coding->common_flags &= ~CODING_ANNOTATE_COMPOSITION_MASK;
7234
7235 if (NILP (coding->src_object))
7236 stop = stop_composition = stop_charset = end_pos;
7237 else
7238 {
7239 if (coding->common_flags & CODING_ANNOTATE_COMPOSITION_MASK)
7240 stop = stop_composition = pos;
7241 else
7242 stop = stop_composition = end_pos;
7243 if (coding->common_flags & CODING_ANNOTATE_CHARSET_MASK)
7244 stop = stop_charset = pos;
7245 else
7246 stop_charset = end_pos;
7247 }
7248
7249 /* Compensate for CRLF and conversion. */
7250 buf_end -= 1 + MAX_ANNOTATION_LENGTH;
7251 while (buf < buf_end)
7252 {
7253 Lisp_Object trans;
7254
7255 if (pos == stop)
7256 {
7257 if (pos == end_pos)
7258 break;
7259 if (pos == stop_composition)
7260 buf = handle_composition_annotation (pos, end_pos, coding,
7261 buf, &stop_composition);
7262 if (pos == stop_charset)
7263 buf = handle_charset_annotation (pos, end_pos, coding,
7264 buf, &stop_charset);
7265 stop = (stop_composition < stop_charset
7266 ? stop_composition : stop_charset);
7267 }
7268
7269 if (! multibytep)
7270 {
7271 EMACS_INT bytes;
7272
7273 if (coding->encoder == encode_coding_raw_text
7274 || coding->encoder == encode_coding_ccl)
7275 c = *src++, pos++;
7276 else if ((bytes = MULTIBYTE_LENGTH (src, src_end)) > 0)
7277 c = STRING_CHAR_ADVANCE_NO_UNIFY (src), pos += bytes;
7278 else
7279 c = BYTE8_TO_CHAR (*src), src++, pos++;
7280 }
7281 else
7282 c = STRING_CHAR_ADVANCE_NO_UNIFY (src), pos++;
7283 if ((c == '\r') && (coding->mode & CODING_MODE_SELECTIVE_DISPLAY))
7284 c = '\n';
7285 if (! EQ (eol_type, Qunix))
7286 {
7287 if (c == '\n')
7288 {
7289 if (EQ (eol_type, Qdos))
7290 *buf++ = '\r';
7291 else
7292 c = '\r';
7293 }
7294 }
7295
7296 trans = Qnil;
7297 LOOKUP_TRANSLATION_TABLE (translation_table, c, trans);
7298 if (NILP (trans))
7299 *buf++ = c;
7300 else
7301 {
7302 int from_nchars = 1, to_nchars = 1;
7303 int *lookup_buf_end;
7304 const unsigned char *p = src;
7305 int i;
7306
7307 lookup_buf[0] = c;
7308 for (i = 1; i < max_lookup && p < src_end; i++)
7309 lookup_buf[i] = STRING_CHAR_ADVANCE (p);
7310 lookup_buf_end = lookup_buf + i;
7311 trans = get_translation (trans, lookup_buf, lookup_buf_end);
7312 if (INTEGERP (trans))
7313 c = XINT (trans);
7314 else if (CONSP (trans))
7315 {
7316 from_nchars = ASIZE (XCAR (trans));
7317 trans = XCDR (trans);
7318 if (INTEGERP (trans))
7319 c = XINT (trans);
7320 else
7321 {
7322 to_nchars = ASIZE (trans);
7323 if (buf + to_nchars > buf_end)
7324 break;
7325 c = XINT (AREF (trans, 0));
7326 }
7327 }
7328 else
7329 break;
7330 *buf++ = c;
7331 for (i = 1; i < to_nchars; i++)
7332 *buf++ = XINT (AREF (trans, i));
7333 for (i = 1; i < from_nchars; i++, pos++)
7334 src += MULTIBYTE_LENGTH_NO_CHECK (src);
7335 }
7336 }
7337
7338 coding->consumed = src - coding->source;
7339 coding->consumed_char = pos - coding->src_pos;
7340 coding->charbuf_used = buf - coding->charbuf;
7341 coding->chars_at_source = 0;
7342 }
7343
7344
7345 /* Encode the text at CODING->src_object into CODING->dst_object.
7346 CODING->src_object is a buffer or a string.
7347 CODING->dst_object is a buffer or nil.
7348
7349 If CODING->src_object is a buffer, it must be the current buffer.
7350 In this case, if CODING->src_pos is positive, it is a position of
7351 the source text in the buffer, otherwise. the source text is in the
7352 gap area of the buffer, and coding->src_pos specifies the offset of
7353 the text from GPT (which must be the same as PT). If this is the
7354 same buffer as CODING->dst_object, CODING->src_pos must be
7355 negative and CODING should not have `pre-write-conversion'.
7356
7357 If CODING->src_object is a string, CODING should not have
7358 `pre-write-conversion'.
7359
7360 If CODING->dst_object is a buffer, the encoded data is inserted at
7361 the current point of that buffer.
7362
7363 If CODING->dst_object is nil, the encoded data is placed at the
7364 memory area specified by CODING->destination. */
7365
7366 static int
7367 encode_coding (struct coding_system *coding)
7368 {
7369 Lisp_Object attrs;
7370 Lisp_Object translation_table;
7371 int max_lookup;
7372 struct ccl_spec cclspec;
7373
7374 attrs = CODING_ID_ATTRS (coding->id);
7375 if (coding->encoder == encode_coding_raw_text)
7376 translation_table = Qnil, max_lookup = 0;
7377 else
7378 translation_table = get_translation_table (attrs, 1, &max_lookup);
7379
7380 if (BUFFERP (coding->dst_object))
7381 {
7382 set_buffer_internal (XBUFFER (coding->dst_object));
7383 coding->dst_multibyte
7384 = ! NILP (BVAR (current_buffer, enable_multibyte_characters));
7385 }
7386
7387 coding->consumed = coding->consumed_char = 0;
7388 coding->produced = coding->produced_char = 0;
7389 record_conversion_result (coding, CODING_RESULT_SUCCESS);
7390 coding->errors = 0;
7391
7392 ALLOC_CONVERSION_WORK_AREA (coding);
7393
7394 if (coding->encoder == encode_coding_ccl)
7395 {
7396 coding->spec.ccl = &cclspec;
7397 setup_ccl_program (&cclspec.ccl, CODING_CCL_ENCODER (coding));
7398 }
7399 do {
7400 coding_set_source (coding);
7401 consume_chars (coding, translation_table, max_lookup);
7402 coding_set_destination (coding);
7403 (*(coding->encoder)) (coding);
7404 } while (coding->consumed_char < coding->src_chars);
7405
7406 if (BUFFERP (coding->dst_object) && coding->produced_char > 0)
7407 insert_from_gap (coding->produced_char, coding->produced);
7408
7409 return (coding->result);
7410 }
7411
7412
7413 /* Name (or base name) of work buffer for code conversion. */
7414 static Lisp_Object Vcode_conversion_workbuf_name;
7415
7416 /* A working buffer used by the top level conversion. Once it is
7417 created, it is never destroyed. It has the name
7418 Vcode_conversion_workbuf_name. The other working buffers are
7419 destroyed after the use is finished, and their names are modified
7420 versions of Vcode_conversion_workbuf_name. */
7421 static Lisp_Object Vcode_conversion_reused_workbuf;
7422
7423 /* 1 iff Vcode_conversion_reused_workbuf is already in use. */
7424 static int reused_workbuf_in_use;
7425
7426
7427 /* Return a working buffer of code conversion. MULTIBYTE specifies the
7428 multibyteness of returning buffer. */
7429
7430 static Lisp_Object
7431 make_conversion_work_buffer (int multibyte)
7432 {
7433 Lisp_Object name, workbuf;
7434 struct buffer *current;
7435
7436 if (reused_workbuf_in_use++)
7437 {
7438 name = Fgenerate_new_buffer_name (Vcode_conversion_workbuf_name, Qnil);
7439 workbuf = Fget_buffer_create (name);
7440 }
7441 else
7442 {
7443 if (NILP (Fbuffer_live_p (Vcode_conversion_reused_workbuf)))
7444 Vcode_conversion_reused_workbuf
7445 = Fget_buffer_create (Vcode_conversion_workbuf_name);
7446 workbuf = Vcode_conversion_reused_workbuf;
7447 }
7448 current = current_buffer;
7449 set_buffer_internal (XBUFFER (workbuf));
7450 /* We can't allow modification hooks to run in the work buffer. For
7451 instance, directory_files_internal assumes that file decoding
7452 doesn't compile new regexps. */
7453 Fset (Fmake_local_variable (Qinhibit_modification_hooks), Qt);
7454 Ferase_buffer ();
7455 BVAR (current_buffer, undo_list) = Qt;
7456 BVAR (current_buffer, enable_multibyte_characters) = multibyte ? Qt : Qnil;
7457 set_buffer_internal (current);
7458 return workbuf;
7459 }
7460
7461
7462 static Lisp_Object
7463 code_conversion_restore (Lisp_Object arg)
7464 {
7465 Lisp_Object current, workbuf;
7466 struct gcpro gcpro1;
7467
7468 GCPRO1 (arg);
7469 current = XCAR (arg);
7470 workbuf = XCDR (arg);
7471 if (! NILP (workbuf))
7472 {
7473 if (EQ (workbuf, Vcode_conversion_reused_workbuf))
7474 reused_workbuf_in_use = 0;
7475 else if (! NILP (Fbuffer_live_p (workbuf)))
7476 Fkill_buffer (workbuf);
7477 }
7478 set_buffer_internal (XBUFFER (current));
7479 UNGCPRO;
7480 return Qnil;
7481 }
7482
7483 Lisp_Object
7484 code_conversion_save (int with_work_buf, int multibyte)
7485 {
7486 Lisp_Object workbuf = Qnil;
7487
7488 if (with_work_buf)
7489 workbuf = make_conversion_work_buffer (multibyte);
7490 record_unwind_protect (code_conversion_restore,
7491 Fcons (Fcurrent_buffer (), workbuf));
7492 return workbuf;
7493 }
7494
7495 int
7496 decode_coding_gap (struct coding_system *coding,
7497 EMACS_INT chars, EMACS_INT bytes)
7498 {
7499 int count = SPECPDL_INDEX ();
7500 Lisp_Object attrs;
7501
7502 code_conversion_save (0, 0);
7503
7504 coding->src_object = Fcurrent_buffer ();
7505 coding->src_chars = chars;
7506 coding->src_bytes = bytes;
7507 coding->src_pos = -chars;
7508 coding->src_pos_byte = -bytes;
7509 coding->src_multibyte = chars < bytes;
7510 coding->dst_object = coding->src_object;
7511 coding->dst_pos = PT;
7512 coding->dst_pos_byte = PT_BYTE;
7513 coding->dst_multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters));
7514
7515 if (CODING_REQUIRE_DETECTION (coding))
7516 detect_coding (coding);
7517
7518 coding->mode |= CODING_MODE_LAST_BLOCK;
7519 current_buffer->text->inhibit_shrinking = 1;
7520 decode_coding (coding);
7521 current_buffer->text->inhibit_shrinking = 0;
7522
7523 attrs = CODING_ID_ATTRS (coding->id);
7524 if (! NILP (CODING_ATTR_POST_READ (attrs)))
7525 {
7526 EMACS_INT prev_Z = Z, prev_Z_BYTE = Z_BYTE;
7527 Lisp_Object val;
7528
7529 TEMP_SET_PT_BOTH (coding->dst_pos, coding->dst_pos_byte);
7530 val = call1 (CODING_ATTR_POST_READ (attrs),
7531 make_number (coding->produced_char));
7532 CHECK_NATNUM (val);
7533 coding->produced_char += Z - prev_Z;
7534 coding->produced += Z_BYTE - prev_Z_BYTE;
7535 }
7536
7537 unbind_to (count, Qnil);
7538 return coding->result;
7539 }
7540
7541
7542 /* Decode the text in the range FROM/FROM_BYTE and TO/TO_BYTE in
7543 SRC_OBJECT into DST_OBJECT by coding context CODING.
7544
7545 SRC_OBJECT is a buffer, a string, or Qnil.
7546
7547 If it is a buffer, the text is at point of the buffer. FROM and TO
7548 are positions in the buffer.
7549
7550 If it is a string, the text is at the beginning of the string.
7551 FROM and TO are indices to the string.
7552
7553 If it is nil, the text is at coding->source. FROM and TO are
7554 indices to coding->source.
7555
7556 DST_OBJECT is a buffer, Qt, or Qnil.
7557
7558 If it is a buffer, the decoded text is inserted at point of the
7559 buffer. If the buffer is the same as SRC_OBJECT, the source text
7560 is deleted.
7561
7562 If it is Qt, a string is made from the decoded text, and
7563 set in CODING->dst_object.
7564
7565 If it is Qnil, the decoded text is stored at CODING->destination.
7566 The caller must allocate CODING->dst_bytes bytes at
7567 CODING->destination by xmalloc. If the decoded text is longer than
7568 CODING->dst_bytes, CODING->destination is relocated by xrealloc.
7569 */
7570
7571 void
7572 decode_coding_object (struct coding_system *coding,
7573 Lisp_Object src_object,
7574 EMACS_INT from, EMACS_INT from_byte,
7575 EMACS_INT to, EMACS_INT to_byte,
7576 Lisp_Object dst_object)
7577 {
7578 int count = SPECPDL_INDEX ();
7579 unsigned char *destination IF_LINT (= NULL);
7580 EMACS_INT dst_bytes IF_LINT (= 0);
7581 EMACS_INT chars = to - from;
7582 EMACS_INT bytes = to_byte - from_byte;
7583 Lisp_Object attrs;
7584 int saved_pt = -1, saved_pt_byte IF_LINT (= 0);
7585 int need_marker_adjustment = 0;
7586 Lisp_Object old_deactivate_mark;
7587
7588 old_deactivate_mark = Vdeactivate_mark;
7589
7590 if (NILP (dst_object))
7591 {
7592 destination = coding->destination;
7593 dst_bytes = coding->dst_bytes;
7594 }
7595
7596 coding->src_object = src_object;
7597 coding->src_chars = chars;
7598 coding->src_bytes = bytes;
7599 coding->src_multibyte = chars < bytes;
7600
7601 if (STRINGP (src_object))
7602 {
7603 coding->src_pos = from;
7604 coding->src_pos_byte = from_byte;
7605 }
7606 else if (BUFFERP (src_object))
7607 {
7608 set_buffer_internal (XBUFFER (src_object));
7609 if (from != GPT)
7610 move_gap_both (from, from_byte);
7611 if (EQ (src_object, dst_object))
7612 {
7613 struct Lisp_Marker *tail;
7614
7615 for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next)
7616 {
7617 tail->need_adjustment
7618 = tail->charpos == (tail->insertion_type ? from : to);
7619 need_marker_adjustment |= tail->need_adjustment;
7620 }
7621 saved_pt = PT, saved_pt_byte = PT_BYTE;
7622 TEMP_SET_PT_BOTH (from, from_byte);
7623 current_buffer->text->inhibit_shrinking = 1;
7624 del_range_both (from, from_byte, to, to_byte, 1);
7625 coding->src_pos = -chars;
7626 coding->src_pos_byte = -bytes;
7627 }
7628 else
7629 {
7630 coding->src_pos = from;
7631 coding->src_pos_byte = from_byte;
7632 }
7633 }
7634
7635 if (CODING_REQUIRE_DETECTION (coding))
7636 detect_coding (coding);
7637 attrs = CODING_ID_ATTRS (coding->id);
7638
7639 if (EQ (dst_object, Qt)
7640 || (! NILP (CODING_ATTR_POST_READ (attrs))
7641 && NILP (dst_object)))
7642 {
7643 coding->dst_multibyte = !CODING_FOR_UNIBYTE (coding);
7644 coding->dst_object = code_conversion_save (1, coding->dst_multibyte);
7645 coding->dst_pos = BEG;
7646 coding->dst_pos_byte = BEG_BYTE;
7647 }
7648 else if (BUFFERP (dst_object))
7649 {
7650 code_conversion_save (0, 0);
7651 coding->dst_object = dst_object;
7652 coding->dst_pos = BUF_PT (XBUFFER (dst_object));
7653 coding->dst_pos_byte = BUF_PT_BYTE (XBUFFER (dst_object));
7654 coding->dst_multibyte
7655 = ! NILP (BVAR (XBUFFER (dst_object), enable_multibyte_characters));
7656 }
7657 else
7658 {
7659 code_conversion_save (0, 0);
7660 coding->dst_object = Qnil;
7661 /* Most callers presume this will return a multibyte result, and they
7662 won't use `binary' or `raw-text' anyway, so let's not worry about
7663 CODING_FOR_UNIBYTE. */
7664 coding->dst_multibyte = 1;
7665 }
7666
7667 decode_coding (coding);
7668
7669 if (BUFFERP (coding->dst_object))
7670 set_buffer_internal (XBUFFER (coding->dst_object));
7671
7672 if (! NILP (CODING_ATTR_POST_READ (attrs)))
7673 {
7674 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
7675 EMACS_INT prev_Z = Z, prev_Z_BYTE = Z_BYTE;
7676 Lisp_Object val;
7677
7678 TEMP_SET_PT_BOTH (coding->dst_pos, coding->dst_pos_byte);
7679 GCPRO5 (coding->src_object, coding->dst_object, src_object, dst_object,
7680 old_deactivate_mark);
7681 val = safe_call1 (CODING_ATTR_POST_READ (attrs),
7682 make_number (coding->produced_char));
7683 UNGCPRO;
7684 CHECK_NATNUM (val);
7685 coding->produced_char += Z - prev_Z;
7686 coding->produced += Z_BYTE - prev_Z_BYTE;
7687 }
7688
7689 if (EQ (dst_object, Qt))
7690 {
7691 coding->dst_object = Fbuffer_string ();
7692 }
7693 else if (NILP (dst_object) && BUFFERP (coding->dst_object))
7694 {
7695 set_buffer_internal (XBUFFER (coding->dst_object));
7696 if (dst_bytes < coding->produced)
7697 {
7698 destination = xrealloc (destination, coding->produced);
7699 if (! destination)
7700 {
7701 record_conversion_result (coding,
7702 CODING_RESULT_INSUFFICIENT_MEM);
7703 unbind_to (count, Qnil);
7704 return;
7705 }
7706 if (BEGV < GPT && GPT < BEGV + coding->produced_char)
7707 move_gap_both (BEGV, BEGV_BYTE);
7708 memcpy (destination, BEGV_ADDR, coding->produced);
7709 coding->destination = destination;
7710 }
7711 }
7712
7713 if (saved_pt >= 0)
7714 {
7715 /* This is the case of:
7716 (BUFFERP (src_object) && EQ (src_object, dst_object))
7717 As we have moved PT while replacing the original buffer
7718 contents, we must recover it now. */
7719 set_buffer_internal (XBUFFER (src_object));
7720 current_buffer->text->inhibit_shrinking = 0;
7721 if (saved_pt < from)
7722 TEMP_SET_PT_BOTH (saved_pt, saved_pt_byte);
7723 else if (saved_pt < from + chars)
7724 TEMP_SET_PT_BOTH (from, from_byte);
7725 else if (! NILP (BVAR (current_buffer, enable_multibyte_characters)))
7726 TEMP_SET_PT_BOTH (saved_pt + (coding->produced_char - chars),
7727 saved_pt_byte + (coding->produced - bytes));
7728 else
7729 TEMP_SET_PT_BOTH (saved_pt + (coding->produced - bytes),
7730 saved_pt_byte + (coding->produced - bytes));
7731
7732 if (need_marker_adjustment)
7733 {
7734 struct Lisp_Marker *tail;
7735
7736 for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next)
7737 if (tail->need_adjustment)
7738 {
7739 tail->need_adjustment = 0;
7740 if (tail->insertion_type)
7741 {
7742 tail->bytepos = from_byte;
7743 tail->charpos = from;
7744 }
7745 else
7746 {
7747 tail->bytepos = from_byte + coding->produced;
7748 tail->charpos
7749 = (NILP (BVAR (current_buffer, enable_multibyte_characters))
7750 ? tail->bytepos : from + coding->produced_char);
7751 }
7752 }
7753 }
7754 }
7755
7756 Vdeactivate_mark = old_deactivate_mark;
7757 unbind_to (count, coding->dst_object);
7758 }
7759
7760
7761 void
7762 encode_coding_object (struct coding_system *coding,
7763 Lisp_Object src_object,
7764 EMACS_INT from, EMACS_INT from_byte,
7765 EMACS_INT to, EMACS_INT to_byte,
7766 Lisp_Object dst_object)
7767 {
7768 int count = SPECPDL_INDEX ();
7769 EMACS_INT chars = to - from;
7770 EMACS_INT bytes = to_byte - from_byte;
7771 Lisp_Object attrs;
7772 int saved_pt = -1, saved_pt_byte IF_LINT (= 0);
7773 int need_marker_adjustment = 0;
7774 int kill_src_buffer = 0;
7775 Lisp_Object old_deactivate_mark;
7776
7777 old_deactivate_mark = Vdeactivate_mark;
7778
7779 coding->src_object = src_object;
7780 coding->src_chars = chars;
7781 coding->src_bytes = bytes;
7782 coding->src_multibyte = chars < bytes;
7783
7784 attrs = CODING_ID_ATTRS (coding->id);
7785
7786 if (EQ (src_object, dst_object))
7787 {
7788 struct Lisp_Marker *tail;
7789
7790 for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next)
7791 {
7792 tail->need_adjustment
7793 = tail->charpos == (tail->insertion_type ? from : to);
7794 need_marker_adjustment |= tail->need_adjustment;
7795 }
7796 }
7797
7798 if (! NILP (CODING_ATTR_PRE_WRITE (attrs)))
7799 {
7800 coding->src_object = code_conversion_save (1, coding->src_multibyte);
7801 set_buffer_internal (XBUFFER (coding->src_object));
7802 if (STRINGP (src_object))
7803 insert_from_string (src_object, from, from_byte, chars, bytes, 0);
7804 else if (BUFFERP (src_object))
7805 insert_from_buffer (XBUFFER (src_object), from, chars, 0);
7806 else
7807 insert_1_both ((char *) coding->source + from, chars, bytes, 0, 0, 0);
7808
7809 if (EQ (src_object, dst_object))
7810 {
7811 set_buffer_internal (XBUFFER (src_object));
7812 saved_pt = PT, saved_pt_byte = PT_BYTE;
7813 del_range_both (from, from_byte, to, to_byte, 1);
7814 set_buffer_internal (XBUFFER (coding->src_object));
7815 }
7816
7817 {
7818 Lisp_Object args[3];
7819 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
7820
7821 GCPRO5 (coding->src_object, coding->dst_object, src_object, dst_object,
7822 old_deactivate_mark);
7823 args[0] = CODING_ATTR_PRE_WRITE (attrs);
7824 args[1] = make_number (BEG);
7825 args[2] = make_number (Z);
7826 safe_call (3, args);
7827 UNGCPRO;
7828 }
7829 if (XBUFFER (coding->src_object) != current_buffer)
7830 kill_src_buffer = 1;
7831 coding->src_object = Fcurrent_buffer ();
7832 if (BEG != GPT)
7833 move_gap_both (BEG, BEG_BYTE);
7834 coding->src_chars = Z - BEG;
7835 coding->src_bytes = Z_BYTE - BEG_BYTE;
7836 coding->src_pos = BEG;
7837 coding->src_pos_byte = BEG_BYTE;
7838 coding->src_multibyte = Z < Z_BYTE;
7839 }
7840 else if (STRINGP (src_object))
7841 {
7842 code_conversion_save (0, 0);
7843 coding->src_pos = from;
7844 coding->src_pos_byte = from_byte;
7845 }
7846 else if (BUFFERP (src_object))
7847 {
7848 code_conversion_save (0, 0);
7849 set_buffer_internal (XBUFFER (src_object));
7850 if (EQ (src_object, dst_object))
7851 {
7852 saved_pt = PT, saved_pt_byte = PT_BYTE;
7853 coding->src_object = del_range_1 (from, to, 1, 1);
7854 coding->src_pos = 0;
7855 coding->src_pos_byte = 0;
7856 }
7857 else
7858 {
7859 if (from < GPT && to >= GPT)
7860 move_gap_both (from, from_byte);
7861 coding->src_pos = from;
7862 coding->src_pos_byte = from_byte;
7863 }
7864 }
7865 else
7866 code_conversion_save (0, 0);
7867
7868 if (BUFFERP (dst_object))
7869 {
7870 coding->dst_object = dst_object;
7871 if (EQ (src_object, dst_object))
7872 {
7873 coding->dst_pos = from;
7874 coding->dst_pos_byte = from_byte;
7875 }
7876 else
7877 {
7878 struct buffer *current = current_buffer;
7879
7880 set_buffer_temp (XBUFFER (dst_object));
7881 coding->dst_pos = PT;
7882 coding->dst_pos_byte = PT_BYTE;
7883 move_gap_both (coding->dst_pos, coding->dst_pos_byte);
7884 set_buffer_temp (current);
7885 }
7886 coding->dst_multibyte
7887 = ! NILP (BVAR (XBUFFER (dst_object), enable_multibyte_characters));
7888 }
7889 else if (EQ (dst_object, Qt))
7890 {
7891 coding->dst_object = Qnil;
7892 coding->dst_bytes = coding->src_chars;
7893 if (coding->dst_bytes == 0)
7894 coding->dst_bytes = 1;
7895 coding->destination = (unsigned char *) xmalloc (coding->dst_bytes);
7896 coding->dst_multibyte = 0;
7897 }
7898 else
7899 {
7900 coding->dst_object = Qnil;
7901 coding->dst_multibyte = 0;
7902 }
7903
7904 encode_coding (coding);
7905
7906 if (EQ (dst_object, Qt))
7907 {
7908 if (BUFFERP (coding->dst_object))
7909 coding->dst_object = Fbuffer_string ();
7910 else
7911 {
7912 coding->dst_object
7913 = make_unibyte_string ((char *) coding->destination,
7914 coding->produced);
7915 xfree (coding->destination);
7916 }
7917 }
7918
7919 if (saved_pt >= 0)
7920 {
7921 /* This is the case of:
7922 (BUFFERP (src_object) && EQ (src_object, dst_object))
7923 As we have moved PT while replacing the original buffer
7924 contents, we must recover it now. */
7925 set_buffer_internal (XBUFFER (src_object));
7926 if (saved_pt < from)
7927 TEMP_SET_PT_BOTH (saved_pt, saved_pt_byte);
7928 else if (saved_pt < from + chars)
7929 TEMP_SET_PT_BOTH (from, from_byte);
7930 else if (! NILP (BVAR (current_buffer, enable_multibyte_characters)))
7931 TEMP_SET_PT_BOTH (saved_pt + (coding->produced_char - chars),
7932 saved_pt_byte + (coding->produced - bytes));
7933 else
7934 TEMP_SET_PT_BOTH (saved_pt + (coding->produced - bytes),
7935 saved_pt_byte + (coding->produced - bytes));
7936
7937 if (need_marker_adjustment)
7938 {
7939 struct Lisp_Marker *tail;
7940
7941 for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next)
7942 if (tail->need_adjustment)
7943 {
7944 tail->need_adjustment = 0;
7945 if (tail->insertion_type)
7946 {
7947 tail->bytepos = from_byte;
7948 tail->charpos = from;
7949 }
7950 else
7951 {
7952 tail->bytepos = from_byte + coding->produced;
7953 tail->charpos
7954 = (NILP (BVAR (current_buffer, enable_multibyte_characters))
7955 ? tail->bytepos : from + coding->produced_char);
7956 }
7957 }
7958 }
7959 }
7960
7961 if (kill_src_buffer)
7962 Fkill_buffer (coding->src_object);
7963
7964 Vdeactivate_mark = old_deactivate_mark;
7965 unbind_to (count, Qnil);
7966 }
7967
7968
7969 Lisp_Object
7970 preferred_coding_system (void)
7971 {
7972 int id = coding_categories[coding_priorities[0]].id;
7973
7974 return CODING_ID_NAME (id);
7975 }
7976
7977 \f
7978 #ifdef emacs
7979 /*** 8. Emacs Lisp library functions ***/
7980
7981 DEFUN ("coding-system-p", Fcoding_system_p, Scoding_system_p, 1, 1, 0,
7982 doc: /* Return t if OBJECT is nil or a coding-system.
7983 See the documentation of `define-coding-system' for information
7984 about coding-system objects. */)
7985 (Lisp_Object object)
7986 {
7987 if (NILP (object)
7988 || CODING_SYSTEM_ID (object) >= 0)
7989 return Qt;
7990 if (! SYMBOLP (object)
7991 || NILP (Fget (object, Qcoding_system_define_form)))
7992 return Qnil;
7993 return Qt;
7994 }
7995
7996 DEFUN ("read-non-nil-coding-system", Fread_non_nil_coding_system,
7997 Sread_non_nil_coding_system, 1, 1, 0,
7998 doc: /* Read a coding system from the minibuffer, prompting with string PROMPT. */)
7999 (Lisp_Object prompt)
8000 {
8001 Lisp_Object val;
8002 do
8003 {
8004 val = Fcompleting_read (prompt, Vcoding_system_alist, Qnil,
8005 Qt, Qnil, Qcoding_system_history, Qnil, Qnil);
8006 }
8007 while (SCHARS (val) == 0);
8008 return (Fintern (val, Qnil));
8009 }
8010
8011 DEFUN ("read-coding-system", Fread_coding_system, Sread_coding_system, 1, 2, 0,
8012 doc: /* Read a coding system from the minibuffer, prompting with string PROMPT.
8013 If the user enters null input, return second argument DEFAULT-CODING-SYSTEM.
8014 Ignores case when completing coding systems (all Emacs coding systems
8015 are lower-case). */)
8016 (Lisp_Object prompt, Lisp_Object default_coding_system)
8017 {
8018 Lisp_Object val;
8019 int count = SPECPDL_INDEX ();
8020
8021 if (SYMBOLP (default_coding_system))
8022 default_coding_system = SYMBOL_NAME (default_coding_system);
8023 specbind (Qcompletion_ignore_case, Qt);
8024 val = Fcompleting_read (prompt, Vcoding_system_alist, Qnil,
8025 Qt, Qnil, Qcoding_system_history,
8026 default_coding_system, Qnil);
8027 unbind_to (count, Qnil);
8028 return (SCHARS (val) == 0 ? Qnil : Fintern (val, Qnil));
8029 }
8030
8031 DEFUN ("check-coding-system", Fcheck_coding_system, Scheck_coding_system,
8032 1, 1, 0,
8033 doc: /* Check validity of CODING-SYSTEM.
8034 If valid, return CODING-SYSTEM, else signal a `coding-system-error' error.
8035 It is valid if it is nil or a symbol defined as a coding system by the
8036 function `define-coding-system'. */)
8037 (Lisp_Object coding_system)
8038 {
8039 Lisp_Object define_form;
8040
8041 define_form = Fget (coding_system, Qcoding_system_define_form);
8042 if (! NILP (define_form))
8043 {
8044 Fput (coding_system, Qcoding_system_define_form, Qnil);
8045 safe_eval (define_form);
8046 }
8047 if (!NILP (Fcoding_system_p (coding_system)))
8048 return coding_system;
8049 xsignal1 (Qcoding_system_error, coding_system);
8050 }
8051
8052 \f
8053 /* Detect how the bytes at SRC of length SRC_BYTES are encoded. If
8054 HIGHEST is nonzero, return the coding system of the highest
8055 priority among the detected coding systems. Otherwise return a
8056 list of detected coding systems sorted by their priorities. If
8057 MULTIBYTEP is nonzero, it is assumed that the bytes are in correct
8058 multibyte form but contains only ASCII and eight-bit chars.
8059 Otherwise, the bytes are raw bytes.
8060
8061 CODING-SYSTEM controls the detection as below:
8062
8063 If it is nil, detect both text-format and eol-format. If the
8064 text-format part of CODING-SYSTEM is already specified
8065 (e.g. `iso-latin-1'), detect only eol-format. If the eol-format
8066 part of CODING-SYSTEM is already specified (e.g. `undecided-unix'),
8067 detect only text-format. */
8068
8069 Lisp_Object
8070 detect_coding_system (const unsigned char *src,
8071 EMACS_INT src_chars, EMACS_INT src_bytes,
8072 int highest, int multibytep,
8073 Lisp_Object coding_system)
8074 {
8075 const unsigned char *src_end = src + src_bytes;
8076 Lisp_Object attrs, eol_type;
8077 Lisp_Object val = Qnil;
8078 struct coding_system coding;
8079 int id;
8080 struct coding_detection_info detect_info;
8081 enum coding_category base_category;
8082 int null_byte_found = 0, eight_bit_found = 0;
8083
8084 if (NILP (coding_system))
8085 coding_system = Qundecided;
8086 setup_coding_system (coding_system, &coding);
8087 attrs = CODING_ID_ATTRS (coding.id);
8088 eol_type = CODING_ID_EOL_TYPE (coding.id);
8089 coding_system = CODING_ATTR_BASE_NAME (attrs);
8090
8091 coding.source = src;
8092 coding.src_chars = src_chars;
8093 coding.src_bytes = src_bytes;
8094 coding.src_multibyte = multibytep;
8095 coding.consumed = 0;
8096 coding.mode |= CODING_MODE_LAST_BLOCK;
8097 coding.head_ascii = 0;
8098
8099 detect_info.checked = detect_info.found = detect_info.rejected = 0;
8100
8101 /* At first, detect text-format if necessary. */
8102 base_category = XINT (CODING_ATTR_CATEGORY (attrs));
8103 if (base_category == coding_category_undecided)
8104 {
8105 enum coding_category category IF_LINT (= 0);
8106 struct coding_system *this IF_LINT (= NULL);
8107 int c, i;
8108
8109 /* Skip all ASCII bytes except for a few ISO2022 controls. */
8110 for (; src < src_end; src++)
8111 {
8112 c = *src;
8113 if (c & 0x80)
8114 {
8115 eight_bit_found = 1;
8116 if (null_byte_found)
8117 break;
8118 }
8119 else if (c < 0x20)
8120 {
8121 if ((c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)
8122 && ! inhibit_iso_escape_detection
8123 && ! detect_info.checked)
8124 {
8125 if (detect_coding_iso_2022 (&coding, &detect_info))
8126 {
8127 /* We have scanned the whole data. */
8128 if (! (detect_info.rejected & CATEGORY_MASK_ISO_7_ELSE))
8129 {
8130 /* We didn't find an 8-bit code. We may
8131 have found a null-byte, but it's very
8132 rare that a binary file confirm to
8133 ISO-2022. */
8134 src = src_end;
8135 coding.head_ascii = src - coding.source;
8136 }
8137 detect_info.rejected |= ~CATEGORY_MASK_ISO_ESCAPE;
8138 break;
8139 }
8140 }
8141 else if (! c && !inhibit_null_byte_detection)
8142 {
8143 null_byte_found = 1;
8144 if (eight_bit_found)
8145 break;
8146 }
8147 if (! eight_bit_found)
8148 coding.head_ascii++;
8149 }
8150 else if (! eight_bit_found)
8151 coding.head_ascii++;
8152 }
8153
8154 if (null_byte_found || eight_bit_found
8155 || coding.head_ascii < coding.src_bytes
8156 || detect_info.found)
8157 {
8158 if (coding.head_ascii == coding.src_bytes)
8159 /* As all bytes are 7-bit, we can ignore non-ISO-2022 codings. */
8160 for (i = 0; i < coding_category_raw_text; i++)
8161 {
8162 category = coding_priorities[i];
8163 this = coding_categories + category;
8164 if (detect_info.found & (1 << category))
8165 break;
8166 }
8167 else
8168 {
8169 if (null_byte_found)
8170 {
8171 detect_info.checked |= ~CATEGORY_MASK_UTF_16;
8172 detect_info.rejected |= ~CATEGORY_MASK_UTF_16;
8173 }
8174 for (i = 0; i < coding_category_raw_text; i++)
8175 {
8176 category = coding_priorities[i];
8177 this = coding_categories + category;
8178
8179 if (this->id < 0)
8180 {
8181 /* No coding system of this category is defined. */
8182 detect_info.rejected |= (1 << category);
8183 }
8184 else if (category >= coding_category_raw_text)
8185 continue;
8186 else if (detect_info.checked & (1 << category))
8187 {
8188 if (highest
8189 && (detect_info.found & (1 << category)))
8190 break;
8191 }
8192 else if ((*(this->detector)) (&coding, &detect_info)
8193 && highest
8194 && (detect_info.found & (1 << category)))
8195 {
8196 if (category == coding_category_utf_16_auto)
8197 {
8198 if (detect_info.found & CATEGORY_MASK_UTF_16_LE)
8199 category = coding_category_utf_16_le;
8200 else
8201 category = coding_category_utf_16_be;
8202 }
8203 break;
8204 }
8205 }
8206 }
8207 }
8208
8209 if ((detect_info.rejected & CATEGORY_MASK_ANY) == CATEGORY_MASK_ANY
8210 || null_byte_found)
8211 {
8212 detect_info.found = CATEGORY_MASK_RAW_TEXT;
8213 id = CODING_SYSTEM_ID (Qno_conversion);
8214 val = Fcons (make_number (id), Qnil);
8215 }
8216 else if (! detect_info.rejected && ! detect_info.found)
8217 {
8218 detect_info.found = CATEGORY_MASK_ANY;
8219 id = coding_categories[coding_category_undecided].id;
8220 val = Fcons (make_number (id), Qnil);
8221 }
8222 else if (highest)
8223 {
8224 if (detect_info.found)
8225 {
8226 detect_info.found = 1 << category;
8227 val = Fcons (make_number (this->id), Qnil);
8228 }
8229 else
8230 for (i = 0; i < coding_category_raw_text; i++)
8231 if (! (detect_info.rejected & (1 << coding_priorities[i])))
8232 {
8233 detect_info.found = 1 << coding_priorities[i];
8234 id = coding_categories[coding_priorities[i]].id;
8235 val = Fcons (make_number (id), Qnil);
8236 break;
8237 }
8238 }
8239 else
8240 {
8241 int mask = detect_info.rejected | detect_info.found;
8242 int found = 0;
8243
8244 for (i = coding_category_raw_text - 1; i >= 0; i--)
8245 {
8246 category = coding_priorities[i];
8247 if (! (mask & (1 << category)))
8248 {
8249 found |= 1 << category;
8250 id = coding_categories[category].id;
8251 if (id >= 0)
8252 val = Fcons (make_number (id), val);
8253 }
8254 }
8255 for (i = coding_category_raw_text - 1; i >= 0; i--)
8256 {
8257 category = coding_priorities[i];
8258 if (detect_info.found & (1 << category))
8259 {
8260 id = coding_categories[category].id;
8261 val = Fcons (make_number (id), val);
8262 }
8263 }
8264 detect_info.found |= found;
8265 }
8266 }
8267 else if (base_category == coding_category_utf_8_auto)
8268 {
8269 if (detect_coding_utf_8 (&coding, &detect_info))
8270 {
8271 struct coding_system *this;
8272
8273 if (detect_info.found & CATEGORY_MASK_UTF_8_SIG)
8274 this = coding_categories + coding_category_utf_8_sig;
8275 else
8276 this = coding_categories + coding_category_utf_8_nosig;
8277 val = Fcons (make_number (this->id), Qnil);
8278 }
8279 }
8280 else if (base_category == coding_category_utf_16_auto)
8281 {
8282 if (detect_coding_utf_16 (&coding, &detect_info))
8283 {
8284 struct coding_system *this;
8285
8286 if (detect_info.found & CATEGORY_MASK_UTF_16_LE)
8287 this = coding_categories + coding_category_utf_16_le;
8288 else if (detect_info.found & CATEGORY_MASK_UTF_16_BE)
8289 this = coding_categories + coding_category_utf_16_be;
8290 else if (detect_info.rejected & CATEGORY_MASK_UTF_16_LE_NOSIG)
8291 this = coding_categories + coding_category_utf_16_be_nosig;
8292 else
8293 this = coding_categories + coding_category_utf_16_le_nosig;
8294 val = Fcons (make_number (this->id), Qnil);
8295 }
8296 }
8297 else
8298 {
8299 detect_info.found = 1 << XINT (CODING_ATTR_CATEGORY (attrs));
8300 val = Fcons (make_number (coding.id), Qnil);
8301 }
8302
8303 /* Then, detect eol-format if necessary. */
8304 {
8305 int normal_eol = -1, utf_16_be_eol = -1, utf_16_le_eol = -1;
8306 Lisp_Object tail;
8307
8308 if (VECTORP (eol_type))
8309 {
8310 if (detect_info.found & ~CATEGORY_MASK_UTF_16)
8311 {
8312 if (null_byte_found)
8313 normal_eol = EOL_SEEN_LF;
8314 else
8315 normal_eol = detect_eol (coding.source, src_bytes,
8316 coding_category_raw_text);
8317 }
8318 if (detect_info.found & (CATEGORY_MASK_UTF_16_BE
8319 | CATEGORY_MASK_UTF_16_BE_NOSIG))
8320 utf_16_be_eol = detect_eol (coding.source, src_bytes,
8321 coding_category_utf_16_be);
8322 if (detect_info.found & (CATEGORY_MASK_UTF_16_LE
8323 | CATEGORY_MASK_UTF_16_LE_NOSIG))
8324 utf_16_le_eol = detect_eol (coding.source, src_bytes,
8325 coding_category_utf_16_le);
8326 }
8327 else
8328 {
8329 if (EQ (eol_type, Qunix))
8330 normal_eol = utf_16_be_eol = utf_16_le_eol = EOL_SEEN_LF;
8331 else if (EQ (eol_type, Qdos))
8332 normal_eol = utf_16_be_eol = utf_16_le_eol = EOL_SEEN_CRLF;
8333 else
8334 normal_eol = utf_16_be_eol = utf_16_le_eol = EOL_SEEN_CR;
8335 }
8336
8337 for (tail = val; CONSP (tail); tail = XCDR (tail))
8338 {
8339 enum coding_category category;
8340 int this_eol;
8341
8342 id = XINT (XCAR (tail));
8343 attrs = CODING_ID_ATTRS (id);
8344 category = XINT (CODING_ATTR_CATEGORY (attrs));
8345 eol_type = CODING_ID_EOL_TYPE (id);
8346 if (VECTORP (eol_type))
8347 {
8348 if (category == coding_category_utf_16_be
8349 || category == coding_category_utf_16_be_nosig)
8350 this_eol = utf_16_be_eol;
8351 else if (category == coding_category_utf_16_le
8352 || category == coding_category_utf_16_le_nosig)
8353 this_eol = utf_16_le_eol;
8354 else
8355 this_eol = normal_eol;
8356
8357 if (this_eol == EOL_SEEN_LF)
8358 XSETCAR (tail, AREF (eol_type, 0));
8359 else if (this_eol == EOL_SEEN_CRLF)
8360 XSETCAR (tail, AREF (eol_type, 1));
8361 else if (this_eol == EOL_SEEN_CR)
8362 XSETCAR (tail, AREF (eol_type, 2));
8363 else
8364 XSETCAR (tail, CODING_ID_NAME (id));
8365 }
8366 else
8367 XSETCAR (tail, CODING_ID_NAME (id));
8368 }
8369 }
8370
8371 return (highest ? (CONSP (val) ? XCAR (val) : Qnil) : val);
8372 }
8373
8374
8375 DEFUN ("detect-coding-region", Fdetect_coding_region, Sdetect_coding_region,
8376 2, 3, 0,
8377 doc: /* Detect coding system of the text in the region between START and END.
8378 Return a list of possible coding systems ordered by priority.
8379 The coding systems to try and their priorities follows what
8380 the function `coding-system-priority-list' (which see) returns.
8381
8382 If only ASCII characters are found (except for such ISO-2022 control
8383 characters as ESC), it returns a list of single element `undecided'
8384 or its subsidiary coding system according to a detected end-of-line
8385 format.
8386
8387 If optional argument HIGHEST is non-nil, return the coding system of
8388 highest priority. */)
8389 (Lisp_Object start, Lisp_Object end, Lisp_Object highest)
8390 {
8391 int from, to;
8392 int from_byte, to_byte;
8393
8394 CHECK_NUMBER_COERCE_MARKER (start);
8395 CHECK_NUMBER_COERCE_MARKER (end);
8396
8397 validate_region (&start, &end);
8398 from = XINT (start), to = XINT (end);
8399 from_byte = CHAR_TO_BYTE (from);
8400 to_byte = CHAR_TO_BYTE (to);
8401
8402 if (from < GPT && to >= GPT)
8403 move_gap_both (to, to_byte);
8404
8405 return detect_coding_system (BYTE_POS_ADDR (from_byte),
8406 to - from, to_byte - from_byte,
8407 !NILP (highest),
8408 !NILP (BVAR (current_buffer
8409 , enable_multibyte_characters)),
8410 Qnil);
8411 }
8412
8413 DEFUN ("detect-coding-string", Fdetect_coding_string, Sdetect_coding_string,
8414 1, 2, 0,
8415 doc: /* Detect coding system of the text in STRING.
8416 Return a list of possible coding systems ordered by priority.
8417 The coding systems to try and their priorities follows what
8418 the function `coding-system-priority-list' (which see) returns.
8419
8420 If only ASCII characters are found (except for such ISO-2022 control
8421 characters as ESC), it returns a list of single element `undecided'
8422 or its subsidiary coding system according to a detected end-of-line
8423 format.
8424
8425 If optional argument HIGHEST is non-nil, return the coding system of
8426 highest priority. */)
8427 (Lisp_Object string, Lisp_Object highest)
8428 {
8429 CHECK_STRING (string);
8430
8431 return detect_coding_system (SDATA (string),
8432 SCHARS (string), SBYTES (string),
8433 !NILP (highest), STRING_MULTIBYTE (string),
8434 Qnil);
8435 }
8436
8437
8438 static INLINE int
8439 char_encodable_p (int c, Lisp_Object attrs)
8440 {
8441 Lisp_Object tail;
8442 struct charset *charset;
8443 Lisp_Object translation_table;
8444
8445 translation_table = CODING_ATTR_TRANS_TBL (attrs);
8446 if (! NILP (translation_table))
8447 c = translate_char (translation_table, c);
8448 for (tail = CODING_ATTR_CHARSET_LIST (attrs);
8449 CONSP (tail); tail = XCDR (tail))
8450 {
8451 charset = CHARSET_FROM_ID (XINT (XCAR (tail)));
8452 if (CHAR_CHARSET_P (c, charset))
8453 break;
8454 }
8455 return (! NILP (tail));
8456 }
8457
8458
8459 /* Return a list of coding systems that safely encode the text between
8460 START and END. If EXCLUDE is non-nil, it is a list of coding
8461 systems not to check. The returned list doesn't contain any such
8462 coding systems. In any case, if the text contains only ASCII or is
8463 unibyte, return t. */
8464
8465 DEFUN ("find-coding-systems-region-internal",
8466 Ffind_coding_systems_region_internal,
8467 Sfind_coding_systems_region_internal, 2, 3, 0,
8468 doc: /* Internal use only. */)
8469 (Lisp_Object start, Lisp_Object end, Lisp_Object exclude)
8470 {
8471 Lisp_Object coding_attrs_list, safe_codings;
8472 EMACS_INT start_byte, end_byte;
8473 const unsigned char *p, *pbeg, *pend;
8474 int c;
8475 Lisp_Object tail, elt, work_table;
8476
8477 if (STRINGP (start))
8478 {
8479 if (!STRING_MULTIBYTE (start)
8480 || SCHARS (start) == SBYTES (start))
8481 return Qt;
8482 start_byte = 0;
8483 end_byte = SBYTES (start);
8484 }
8485 else
8486 {
8487 CHECK_NUMBER_COERCE_MARKER (start);
8488 CHECK_NUMBER_COERCE_MARKER (end);
8489 if (XINT (start) < BEG || XINT (end) > Z || XINT (start) > XINT (end))
8490 args_out_of_range (start, end);
8491 if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
8492 return Qt;
8493 start_byte = CHAR_TO_BYTE (XINT (start));
8494 end_byte = CHAR_TO_BYTE (XINT (end));
8495 if (XINT (end) - XINT (start) == end_byte - start_byte)
8496 return Qt;
8497
8498 if (XINT (start) < GPT && XINT (end) > GPT)
8499 {
8500 if ((GPT - XINT (start)) < (XINT (end) - GPT))
8501 move_gap_both (XINT (start), start_byte);
8502 else
8503 move_gap_both (XINT (end), end_byte);
8504 }
8505 }
8506
8507 coding_attrs_list = Qnil;
8508 for (tail = Vcoding_system_list; CONSP (tail); tail = XCDR (tail))
8509 if (NILP (exclude)
8510 || NILP (Fmemq (XCAR (tail), exclude)))
8511 {
8512 Lisp_Object attrs;
8513
8514 attrs = AREF (CODING_SYSTEM_SPEC (XCAR (tail)), 0);
8515 if (EQ (XCAR (tail), CODING_ATTR_BASE_NAME (attrs))
8516 && ! EQ (CODING_ATTR_TYPE (attrs), Qundecided))
8517 {
8518 ASET (attrs, coding_attr_trans_tbl,
8519 get_translation_table (attrs, 1, NULL));
8520 coding_attrs_list = Fcons (attrs, coding_attrs_list);
8521 }
8522 }
8523
8524 if (STRINGP (start))
8525 p = pbeg = SDATA (start);
8526 else
8527 p = pbeg = BYTE_POS_ADDR (start_byte);
8528 pend = p + (end_byte - start_byte);
8529
8530 while (p < pend && ASCII_BYTE_P (*p)) p++;
8531 while (p < pend && ASCII_BYTE_P (*(pend - 1))) pend--;
8532
8533 work_table = Fmake_char_table (Qnil, Qnil);
8534 while (p < pend)
8535 {
8536 if (ASCII_BYTE_P (*p))
8537 p++;
8538 else
8539 {
8540 c = STRING_CHAR_ADVANCE (p);
8541 if (!NILP (char_table_ref (work_table, c)))
8542 /* This character was already checked. Ignore it. */
8543 continue;
8544
8545 charset_map_loaded = 0;
8546 for (tail = coding_attrs_list; CONSP (tail);)
8547 {
8548 elt = XCAR (tail);
8549 if (NILP (elt))
8550 tail = XCDR (tail);
8551 else if (char_encodable_p (c, elt))
8552 tail = XCDR (tail);
8553 else if (CONSP (XCDR (tail)))
8554 {
8555 XSETCAR (tail, XCAR (XCDR (tail)));
8556 XSETCDR (tail, XCDR (XCDR (tail)));
8557 }
8558 else
8559 {
8560 XSETCAR (tail, Qnil);
8561 tail = XCDR (tail);
8562 }
8563 }
8564 if (charset_map_loaded)
8565 {
8566 EMACS_INT p_offset = p - pbeg, pend_offset = pend - pbeg;
8567
8568 if (STRINGP (start))
8569 pbeg = SDATA (start);
8570 else
8571 pbeg = BYTE_POS_ADDR (start_byte);
8572 p = pbeg + p_offset;
8573 pend = pbeg + pend_offset;
8574 }
8575 char_table_set (work_table, c, Qt);
8576 }
8577 }
8578
8579 safe_codings = list2 (Qraw_text, Qno_conversion);
8580 for (tail = coding_attrs_list; CONSP (tail); tail = XCDR (tail))
8581 if (! NILP (XCAR (tail)))
8582 safe_codings = Fcons (CODING_ATTR_BASE_NAME (XCAR (tail)), safe_codings);
8583
8584 return safe_codings;
8585 }
8586
8587
8588 DEFUN ("unencodable-char-position", Funencodable_char_position,
8589 Sunencodable_char_position, 3, 5, 0,
8590 doc: /*
8591 Return position of first un-encodable character in a region.
8592 START and END specify the region and CODING-SYSTEM specifies the
8593 encoding to check. Return nil if CODING-SYSTEM does encode the region.
8594
8595 If optional 4th argument COUNT is non-nil, it specifies at most how
8596 many un-encodable characters to search. In this case, the value is a
8597 list of positions.
8598
8599 If optional 5th argument STRING is non-nil, it is a string to search
8600 for un-encodable characters. In that case, START and END are indexes
8601 to the string. */)
8602 (Lisp_Object start, Lisp_Object end, Lisp_Object coding_system, Lisp_Object count, Lisp_Object string)
8603 {
8604 int n;
8605 struct coding_system coding;
8606 Lisp_Object attrs, charset_list, translation_table;
8607 Lisp_Object positions;
8608 int from, to;
8609 const unsigned char *p, *stop, *pend;
8610 int ascii_compatible;
8611
8612 setup_coding_system (Fcheck_coding_system (coding_system), &coding);
8613 attrs = CODING_ID_ATTRS (coding.id);
8614 if (EQ (CODING_ATTR_TYPE (attrs), Qraw_text))
8615 return Qnil;
8616 ascii_compatible = ! NILP (CODING_ATTR_ASCII_COMPAT (attrs));
8617 charset_list = CODING_ATTR_CHARSET_LIST (attrs);
8618 translation_table = get_translation_table (attrs, 1, NULL);
8619
8620 if (NILP (string))
8621 {
8622 validate_region (&start, &end);
8623 from = XINT (start);
8624 to = XINT (end);
8625 if (NILP (BVAR (current_buffer, enable_multibyte_characters))
8626 || (ascii_compatible
8627 && (to - from) == (CHAR_TO_BYTE (to) - (CHAR_TO_BYTE (from)))))
8628 return Qnil;
8629 p = CHAR_POS_ADDR (from);
8630 pend = CHAR_POS_ADDR (to);
8631 if (from < GPT && to >= GPT)
8632 stop = GPT_ADDR;
8633 else
8634 stop = pend;
8635 }
8636 else
8637 {
8638 CHECK_STRING (string);
8639 CHECK_NATNUM (start);
8640 CHECK_NATNUM (end);
8641 from = XINT (start);
8642 to = XINT (end);
8643 if (from > to
8644 || to > SCHARS (string))
8645 args_out_of_range_3 (string, start, end);
8646 if (! STRING_MULTIBYTE (string))
8647 return Qnil;
8648 p = SDATA (string) + string_char_to_byte (string, from);
8649 stop = pend = SDATA (string) + string_char_to_byte (string, to);
8650 if (ascii_compatible && (to - from) == (pend - p))
8651 return Qnil;
8652 }
8653
8654 if (NILP (count))
8655 n = 1;
8656 else
8657 {
8658 CHECK_NATNUM (count);
8659 n = XINT (count);
8660 }
8661
8662 positions = Qnil;
8663 while (1)
8664 {
8665 int c;
8666
8667 if (ascii_compatible)
8668 while (p < stop && ASCII_BYTE_P (*p))
8669 p++, from++;
8670 if (p >= stop)
8671 {
8672 if (p >= pend)
8673 break;
8674 stop = pend;
8675 p = GAP_END_ADDR;
8676 }
8677
8678 c = STRING_CHAR_ADVANCE (p);
8679 if (! (ASCII_CHAR_P (c) && ascii_compatible)
8680 && ! char_charset (translate_char (translation_table, c),
8681 charset_list, NULL))
8682 {
8683 positions = Fcons (make_number (from), positions);
8684 n--;
8685 if (n == 0)
8686 break;
8687 }
8688
8689 from++;
8690 }
8691
8692 return (NILP (count) ? Fcar (positions) : Fnreverse (positions));
8693 }
8694
8695
8696 DEFUN ("check-coding-systems-region", Fcheck_coding_systems_region,
8697 Scheck_coding_systems_region, 3, 3, 0,
8698 doc: /* Check if the region is encodable by coding systems.
8699
8700 START and END are buffer positions specifying the region.
8701 CODING-SYSTEM-LIST is a list of coding systems to check.
8702
8703 The value is an alist ((CODING-SYSTEM POS0 POS1 ...) ...), where
8704 CODING-SYSTEM is a member of CODING-SYSTEM-LIST and can't encode the
8705 whole region, POS0, POS1, ... are buffer positions where non-encodable
8706 characters are found.
8707
8708 If all coding systems in CODING-SYSTEM-LIST can encode the region, the
8709 value is nil.
8710
8711 START may be a string. In that case, check if the string is
8712 encodable, and the value contains indices to the string instead of
8713 buffer positions. END is ignored.
8714
8715 If the current buffer (or START if it is a string) is unibyte, the value
8716 is nil. */)
8717 (Lisp_Object start, Lisp_Object end, Lisp_Object coding_system_list)
8718 {
8719 Lisp_Object list;
8720 EMACS_INT start_byte, end_byte;
8721 int pos;
8722 const unsigned char *p, *pbeg, *pend;
8723 int c;
8724 Lisp_Object tail, elt, attrs;
8725
8726 if (STRINGP (start))
8727 {
8728 if (!STRING_MULTIBYTE (start)
8729 || SCHARS (start) == SBYTES (start))
8730 return Qnil;
8731 start_byte = 0;
8732 end_byte = SBYTES (start);
8733 pos = 0;
8734 }
8735 else
8736 {
8737 CHECK_NUMBER_COERCE_MARKER (start);
8738 CHECK_NUMBER_COERCE_MARKER (end);
8739 if (XINT (start) < BEG || XINT (end) > Z || XINT (start) > XINT (end))
8740 args_out_of_range (start, end);
8741 if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
8742 return Qnil;
8743 start_byte = CHAR_TO_BYTE (XINT (start));
8744 end_byte = CHAR_TO_BYTE (XINT (end));
8745 if (XINT (end) - XINT (start) == end_byte - start_byte)
8746 return Qnil;
8747
8748 if (XINT (start) < GPT && XINT (end) > GPT)
8749 {
8750 if ((GPT - XINT (start)) < (XINT (end) - GPT))
8751 move_gap_both (XINT (start), start_byte);
8752 else
8753 move_gap_both (XINT (end), end_byte);
8754 }
8755 pos = XINT (start);
8756 }
8757
8758 list = Qnil;
8759 for (tail = coding_system_list; CONSP (tail); tail = XCDR (tail))
8760 {
8761 elt = XCAR (tail);
8762 attrs = AREF (CODING_SYSTEM_SPEC (elt), 0);
8763 ASET (attrs, coding_attr_trans_tbl,
8764 get_translation_table (attrs, 1, NULL));
8765 list = Fcons (Fcons (elt, Fcons (attrs, Qnil)), list);
8766 }
8767
8768 if (STRINGP (start))
8769 p = pbeg = SDATA (start);
8770 else
8771 p = pbeg = BYTE_POS_ADDR (start_byte);
8772 pend = p + (end_byte - start_byte);
8773
8774 while (p < pend && ASCII_BYTE_P (*p)) p++, pos++;
8775 while (p < pend && ASCII_BYTE_P (*(pend - 1))) pend--;
8776
8777 while (p < pend)
8778 {
8779 if (ASCII_BYTE_P (*p))
8780 p++;
8781 else
8782 {
8783 c = STRING_CHAR_ADVANCE (p);
8784
8785 charset_map_loaded = 0;
8786 for (tail = list; CONSP (tail); tail = XCDR (tail))
8787 {
8788 elt = XCDR (XCAR (tail));
8789 if (! char_encodable_p (c, XCAR (elt)))
8790 XSETCDR (elt, Fcons (make_number (pos), XCDR (elt)));
8791 }
8792 if (charset_map_loaded)
8793 {
8794 EMACS_INT p_offset = p - pbeg, pend_offset = pend - pbeg;
8795
8796 if (STRINGP (start))
8797 pbeg = SDATA (start);
8798 else
8799 pbeg = BYTE_POS_ADDR (start_byte);
8800 p = pbeg + p_offset;
8801 pend = pbeg + pend_offset;
8802 }
8803 }
8804 pos++;
8805 }
8806
8807 tail = list;
8808 list = Qnil;
8809 for (; CONSP (tail); tail = XCDR (tail))
8810 {
8811 elt = XCAR (tail);
8812 if (CONSP (XCDR (XCDR (elt))))
8813 list = Fcons (Fcons (XCAR (elt), Fnreverse (XCDR (XCDR (elt)))),
8814 list);
8815 }
8816
8817 return list;
8818 }
8819
8820
8821 static Lisp_Object
8822 code_convert_region (Lisp_Object start, Lisp_Object end,
8823 Lisp_Object coding_system, Lisp_Object dst_object,
8824 int encodep, int norecord)
8825 {
8826 struct coding_system coding;
8827 EMACS_INT from, from_byte, to, to_byte;
8828 Lisp_Object src_object;
8829
8830 CHECK_NUMBER_COERCE_MARKER (start);
8831 CHECK_NUMBER_COERCE_MARKER (end);
8832 if (NILP (coding_system))
8833 coding_system = Qno_conversion;
8834 else
8835 CHECK_CODING_SYSTEM (coding_system);
8836 src_object = Fcurrent_buffer ();
8837 if (NILP (dst_object))
8838 dst_object = src_object;
8839 else if (! EQ (dst_object, Qt))
8840 CHECK_BUFFER (dst_object);
8841
8842 validate_region (&start, &end);
8843 from = XFASTINT (start);
8844 from_byte = CHAR_TO_BYTE (from);
8845 to = XFASTINT (end);
8846 to_byte = CHAR_TO_BYTE (to);
8847
8848 setup_coding_system (coding_system, &coding);
8849 coding.mode |= CODING_MODE_LAST_BLOCK;
8850
8851 if (encodep)
8852 encode_coding_object (&coding, src_object, from, from_byte, to, to_byte,
8853 dst_object);
8854 else
8855 decode_coding_object (&coding, src_object, from, from_byte, to, to_byte,
8856 dst_object);
8857 if (! norecord)
8858 Vlast_coding_system_used = CODING_ID_NAME (coding.id);
8859
8860 return (BUFFERP (dst_object)
8861 ? make_number (coding.produced_char)
8862 : coding.dst_object);
8863 }
8864
8865
8866 DEFUN ("decode-coding-region", Fdecode_coding_region, Sdecode_coding_region,
8867 3, 4, "r\nzCoding system: ",
8868 doc: /* Decode the current region from the specified coding system.
8869 When called from a program, takes four arguments:
8870 START, END, CODING-SYSTEM, and DESTINATION.
8871 START and END are buffer positions.
8872
8873 Optional 4th arguments DESTINATION specifies where the decoded text goes.
8874 If nil, the region between START and END is replaced by the decoded text.
8875 If buffer, the decoded text is inserted in that buffer after point (point
8876 does not move).
8877 In those cases, the length of the decoded text is returned.
8878 If DESTINATION is t, the decoded text is returned.
8879
8880 This function sets `last-coding-system-used' to the precise coding system
8881 used (which may be different from CODING-SYSTEM if CODING-SYSTEM is
8882 not fully specified.) */)
8883 (Lisp_Object start, Lisp_Object end, Lisp_Object coding_system, Lisp_Object destination)
8884 {
8885 return code_convert_region (start, end, coding_system, destination, 0, 0);
8886 }
8887
8888 DEFUN ("encode-coding-region", Fencode_coding_region, Sencode_coding_region,
8889 3, 4, "r\nzCoding system: ",
8890 doc: /* Encode the current region by specified coding system.
8891 When called from a program, takes four arguments:
8892 START, END, CODING-SYSTEM and DESTINATION.
8893 START and END are buffer positions.
8894
8895 Optional 4th arguments DESTINATION specifies where the encoded text goes.
8896 If nil, the region between START and END is replace by the encoded text.
8897 If buffer, the encoded text is inserted in that buffer after point (point
8898 does not move).
8899 In those cases, the length of the encoded text is returned.
8900 If DESTINATION is t, the encoded text is returned.
8901
8902 This function sets `last-coding-system-used' to the precise coding system
8903 used (which may be different from CODING-SYSTEM if CODING-SYSTEM is
8904 not fully specified.) */)
8905 (Lisp_Object start, Lisp_Object end, Lisp_Object coding_system, Lisp_Object destination)
8906 {
8907 return code_convert_region (start, end, coding_system, destination, 1, 0);
8908 }
8909
8910 Lisp_Object
8911 code_convert_string (Lisp_Object string, Lisp_Object coding_system,
8912 Lisp_Object dst_object, int encodep, int nocopy, int norecord)
8913 {
8914 struct coding_system coding;
8915 EMACS_INT chars, bytes;
8916
8917 CHECK_STRING (string);
8918 if (NILP (coding_system))
8919 {
8920 if (! norecord)
8921 Vlast_coding_system_used = Qno_conversion;
8922 if (NILP (dst_object))
8923 return (nocopy ? Fcopy_sequence (string) : string);
8924 }
8925
8926 if (NILP (coding_system))
8927 coding_system = Qno_conversion;
8928 else
8929 CHECK_CODING_SYSTEM (coding_system);
8930 if (NILP (dst_object))
8931 dst_object = Qt;
8932 else if (! EQ (dst_object, Qt))
8933 CHECK_BUFFER (dst_object);
8934
8935 setup_coding_system (coding_system, &coding);
8936 coding.mode |= CODING_MODE_LAST_BLOCK;
8937 chars = SCHARS (string);
8938 bytes = SBYTES (string);
8939 if (encodep)
8940 encode_coding_object (&coding, string, 0, 0, chars, bytes, dst_object);
8941 else
8942 decode_coding_object (&coding, string, 0, 0, chars, bytes, dst_object);
8943 if (! norecord)
8944 Vlast_coding_system_used = CODING_ID_NAME (coding.id);
8945
8946 return (BUFFERP (dst_object)
8947 ? make_number (coding.produced_char)
8948 : coding.dst_object);
8949 }
8950
8951
8952 /* Encode or decode STRING according to CODING_SYSTEM.
8953 Do not set Vlast_coding_system_used.
8954
8955 This function is called only from macros DECODE_FILE and
8956 ENCODE_FILE, thus we ignore character composition. */
8957
8958 Lisp_Object
8959 code_convert_string_norecord (Lisp_Object string, Lisp_Object coding_system,
8960 int encodep)
8961 {
8962 return code_convert_string (string, coding_system, Qt, encodep, 0, 1);
8963 }
8964
8965
8966 DEFUN ("decode-coding-string", Fdecode_coding_string, Sdecode_coding_string,
8967 2, 4, 0,
8968 doc: /* Decode STRING which is encoded in CODING-SYSTEM, and return the result.
8969
8970 Optional third arg NOCOPY non-nil means it is OK to return STRING itself
8971 if the decoding operation is trivial.
8972
8973 Optional fourth arg BUFFER non-nil means that the decoded text is
8974 inserted in that buffer after point (point does not move). In this
8975 case, the return value is the length of the decoded text.
8976
8977 This function sets `last-coding-system-used' to the precise coding system
8978 used (which may be different from CODING-SYSTEM if CODING-SYSTEM is
8979 not fully specified.) */)
8980 (Lisp_Object string, Lisp_Object coding_system, Lisp_Object nocopy, Lisp_Object buffer)
8981 {
8982 return code_convert_string (string, coding_system, buffer,
8983 0, ! NILP (nocopy), 0);
8984 }
8985
8986 DEFUN ("encode-coding-string", Fencode_coding_string, Sencode_coding_string,
8987 2, 4, 0,
8988 doc: /* Encode STRING to CODING-SYSTEM, and return the result.
8989
8990 Optional third arg NOCOPY non-nil means it is OK to return STRING
8991 itself if the encoding operation is trivial.
8992
8993 Optional fourth arg BUFFER non-nil means that the encoded text is
8994 inserted in that buffer after point (point does not move). In this
8995 case, the return value is the length of the encoded text.
8996
8997 This function sets `last-coding-system-used' to the precise coding system
8998 used (which may be different from CODING-SYSTEM if CODING-SYSTEM is
8999 not fully specified.) */)
9000 (Lisp_Object string, Lisp_Object coding_system, Lisp_Object nocopy, Lisp_Object buffer)
9001 {
9002 return code_convert_string (string, coding_system, buffer,
9003 1, ! NILP (nocopy), 1);
9004 }
9005
9006 \f
9007 DEFUN ("decode-sjis-char", Fdecode_sjis_char, Sdecode_sjis_char, 1, 1, 0,
9008 doc: /* Decode a Japanese character which has CODE in shift_jis encoding.
9009 Return the corresponding character. */)
9010 (Lisp_Object code)
9011 {
9012 Lisp_Object spec, attrs, val;
9013 struct charset *charset_roman, *charset_kanji, *charset_kana, *charset;
9014 EMACS_INT ch;
9015 int c;
9016
9017 CHECK_NATNUM (code);
9018 ch = XFASTINT (code);
9019 CHECK_CODING_SYSTEM_GET_SPEC (Vsjis_coding_system, spec);
9020 attrs = AREF (spec, 0);
9021
9022 if (ASCII_BYTE_P (ch)
9023 && ! NILP (CODING_ATTR_ASCII_COMPAT (attrs)))
9024 return code;
9025
9026 val = CODING_ATTR_CHARSET_LIST (attrs);
9027 charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
9028 charset_kana = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
9029 charset_kanji = CHARSET_FROM_ID (XINT (XCAR (val)));
9030
9031 if (ch <= 0x7F)
9032 {
9033 c = ch;
9034 charset = charset_roman;
9035 }
9036 else if (ch >= 0xA0 && ch < 0xDF)
9037 {
9038 c = ch - 0x80;
9039 charset = charset_kana;
9040 }
9041 else
9042 {
9043 EMACS_INT c1 = ch >> 8;
9044 int c2 = ch & 0xFF;
9045
9046 if (c1 < 0x81 || (c1 > 0x9F && c1 < 0xE0) || c1 > 0xEF
9047 || c2 < 0x40 || c2 == 0x7F || c2 > 0xFC)
9048 error ("Invalid code: %"pI"d", ch);
9049 c = ch;
9050 SJIS_TO_JIS (c);
9051 charset = charset_kanji;
9052 }
9053 c = DECODE_CHAR (charset, c);
9054 if (c < 0)
9055 error ("Invalid code: %"pI"d", ch);
9056 return make_number (c);
9057 }
9058
9059
9060 DEFUN ("encode-sjis-char", Fencode_sjis_char, Sencode_sjis_char, 1, 1, 0,
9061 doc: /* Encode a Japanese character CH to shift_jis encoding.
9062 Return the corresponding code in SJIS. */)
9063 (Lisp_Object ch)
9064 {
9065 Lisp_Object spec, attrs, charset_list;
9066 int c;
9067 struct charset *charset;
9068 unsigned code;
9069
9070 CHECK_CHARACTER (ch);
9071 c = XFASTINT (ch);
9072 CHECK_CODING_SYSTEM_GET_SPEC (Vsjis_coding_system, spec);
9073 attrs = AREF (spec, 0);
9074
9075 if (ASCII_CHAR_P (c)
9076 && ! NILP (CODING_ATTR_ASCII_COMPAT (attrs)))
9077 return ch;
9078
9079 charset_list = CODING_ATTR_CHARSET_LIST (attrs);
9080 charset = char_charset (c, charset_list, &code);
9081 if (code == CHARSET_INVALID_CODE (charset))
9082 error ("Can't encode by shift_jis encoding: %c", c);
9083 JIS_TO_SJIS (code);
9084
9085 return make_number (code);
9086 }
9087
9088 DEFUN ("decode-big5-char", Fdecode_big5_char, Sdecode_big5_char, 1, 1, 0,
9089 doc: /* Decode a Big5 character which has CODE in BIG5 coding system.
9090 Return the corresponding character. */)
9091 (Lisp_Object code)
9092 {
9093 Lisp_Object spec, attrs, val;
9094 struct charset *charset_roman, *charset_big5, *charset;
9095 EMACS_INT ch;
9096 int c;
9097
9098 CHECK_NATNUM (code);
9099 ch = XFASTINT (code);
9100 CHECK_CODING_SYSTEM_GET_SPEC (Vbig5_coding_system, spec);
9101 attrs = AREF (spec, 0);
9102
9103 if (ASCII_BYTE_P (ch)
9104 && ! NILP (CODING_ATTR_ASCII_COMPAT (attrs)))
9105 return code;
9106
9107 val = CODING_ATTR_CHARSET_LIST (attrs);
9108 charset_roman = CHARSET_FROM_ID (XINT (XCAR (val))), val = XCDR (val);
9109 charset_big5 = CHARSET_FROM_ID (XINT (XCAR (val)));
9110
9111 if (ch <= 0x7F)
9112 {
9113 c = ch;
9114 charset = charset_roman;
9115 }
9116 else
9117 {
9118 EMACS_INT b1 = ch >> 8;
9119 int b2 = ch & 0x7F;
9120 if (b1 < 0xA1 || b1 > 0xFE
9121 || b2 < 0x40 || (b2 > 0x7E && b2 < 0xA1) || b2 > 0xFE)
9122 error ("Invalid code: %"pI"d", ch);
9123 c = ch;
9124 charset = charset_big5;
9125 }
9126 c = DECODE_CHAR (charset, c);
9127 if (c < 0)
9128 error ("Invalid code: %"pI"d", ch);
9129 return make_number (c);
9130 }
9131
9132 DEFUN ("encode-big5-char", Fencode_big5_char, Sencode_big5_char, 1, 1, 0,
9133 doc: /* Encode the Big5 character CH to BIG5 coding system.
9134 Return the corresponding character code in Big5. */)
9135 (Lisp_Object ch)
9136 {
9137 Lisp_Object spec, attrs, charset_list;
9138 struct charset *charset;
9139 int c;
9140 unsigned code;
9141
9142 CHECK_CHARACTER (ch);
9143 c = XFASTINT (ch);
9144 CHECK_CODING_SYSTEM_GET_SPEC (Vbig5_coding_system, spec);
9145 attrs = AREF (spec, 0);
9146 if (ASCII_CHAR_P (c)
9147 && ! NILP (CODING_ATTR_ASCII_COMPAT (attrs)))
9148 return ch;
9149
9150 charset_list = CODING_ATTR_CHARSET_LIST (attrs);
9151 charset = char_charset (c, charset_list, &code);
9152 if (code == CHARSET_INVALID_CODE (charset))
9153 error ("Can't encode by Big5 encoding: %c", c);
9154
9155 return make_number (code);
9156 }
9157
9158 \f
9159 DEFUN ("set-terminal-coding-system-internal", Fset_terminal_coding_system_internal,
9160 Sset_terminal_coding_system_internal, 1, 2, 0,
9161 doc: /* Internal use only. */)
9162 (Lisp_Object coding_system, Lisp_Object terminal)
9163 {
9164 struct terminal *term = get_terminal (terminal, 1);
9165 struct coding_system *terminal_coding = TERMINAL_TERMINAL_CODING (term);
9166 CHECK_SYMBOL (coding_system);
9167 setup_coding_system (Fcheck_coding_system (coding_system), terminal_coding);
9168 /* We had better not send unsafe characters to terminal. */
9169 terminal_coding->mode |= CODING_MODE_SAFE_ENCODING;
9170 /* Character composition should be disabled. */
9171 terminal_coding->common_flags &= ~CODING_ANNOTATE_COMPOSITION_MASK;
9172 terminal_coding->src_multibyte = 1;
9173 terminal_coding->dst_multibyte = 0;
9174 if (terminal_coding->common_flags & CODING_REQUIRE_ENCODING_MASK)
9175 term->charset_list = coding_charset_list (terminal_coding);
9176 else
9177 term->charset_list = Fcons (make_number (charset_ascii), Qnil);
9178 return Qnil;
9179 }
9180
9181 DEFUN ("set-safe-terminal-coding-system-internal",
9182 Fset_safe_terminal_coding_system_internal,
9183 Sset_safe_terminal_coding_system_internal, 1, 1, 0,
9184 doc: /* Internal use only. */)
9185 (Lisp_Object coding_system)
9186 {
9187 CHECK_SYMBOL (coding_system);
9188 setup_coding_system (Fcheck_coding_system (coding_system),
9189 &safe_terminal_coding);
9190 /* Character composition should be disabled. */
9191 safe_terminal_coding.common_flags &= ~CODING_ANNOTATE_COMPOSITION_MASK;
9192 safe_terminal_coding.src_multibyte = 1;
9193 safe_terminal_coding.dst_multibyte = 0;
9194 return Qnil;
9195 }
9196
9197 DEFUN ("terminal-coding-system", Fterminal_coding_system,
9198 Sterminal_coding_system, 0, 1, 0,
9199 doc: /* Return coding system specified for terminal output on the given terminal.
9200 TERMINAL may be a terminal object, a frame, or nil for the selected
9201 frame's terminal device. */)
9202 (Lisp_Object terminal)
9203 {
9204 struct coding_system *terminal_coding
9205 = TERMINAL_TERMINAL_CODING (get_terminal (terminal, 1));
9206 Lisp_Object coding_system = CODING_ID_NAME (terminal_coding->id);
9207
9208 /* For backward compatibility, return nil if it is `undecided'. */
9209 return (! EQ (coding_system, Qundecided) ? coding_system : Qnil);
9210 }
9211
9212 DEFUN ("set-keyboard-coding-system-internal", Fset_keyboard_coding_system_internal,
9213 Sset_keyboard_coding_system_internal, 1, 2, 0,
9214 doc: /* Internal use only. */)
9215 (Lisp_Object coding_system, Lisp_Object terminal)
9216 {
9217 struct terminal *t = get_terminal (terminal, 1);
9218 CHECK_SYMBOL (coding_system);
9219 if (NILP (coding_system))
9220 coding_system = Qno_conversion;
9221 else
9222 Fcheck_coding_system (coding_system);
9223 setup_coding_system (coding_system, TERMINAL_KEYBOARD_CODING (t));
9224 /* Character composition should be disabled. */
9225 TERMINAL_KEYBOARD_CODING (t)->common_flags
9226 &= ~CODING_ANNOTATE_COMPOSITION_MASK;
9227 return Qnil;
9228 }
9229
9230 DEFUN ("keyboard-coding-system",
9231 Fkeyboard_coding_system, Skeyboard_coding_system, 0, 1, 0,
9232 doc: /* Return coding system specified for decoding keyboard input. */)
9233 (Lisp_Object terminal)
9234 {
9235 return CODING_ID_NAME (TERMINAL_KEYBOARD_CODING
9236 (get_terminal (terminal, 1))->id);
9237 }
9238
9239 \f
9240 DEFUN ("find-operation-coding-system", Ffind_operation_coding_system,
9241 Sfind_operation_coding_system, 1, MANY, 0,
9242 doc: /* Choose a coding system for an operation based on the target name.
9243 The value names a pair of coding systems: (DECODING-SYSTEM . ENCODING-SYSTEM).
9244 DECODING-SYSTEM is the coding system to use for decoding
9245 \(in case OPERATION does decoding), and ENCODING-SYSTEM is the coding system
9246 for encoding (in case OPERATION does encoding).
9247
9248 The first argument OPERATION specifies an I/O primitive:
9249 For file I/O, `insert-file-contents' or `write-region'.
9250 For process I/O, `call-process', `call-process-region', or `start-process'.
9251 For network I/O, `open-network-stream'.
9252
9253 The remaining arguments should be the same arguments that were passed
9254 to the primitive. Depending on which primitive, one of those arguments
9255 is selected as the TARGET. For example, if OPERATION does file I/O,
9256 whichever argument specifies the file name is TARGET.
9257
9258 TARGET has a meaning which depends on OPERATION:
9259 For file I/O, TARGET is a file name (except for the special case below).
9260 For process I/O, TARGET is a process name.
9261 For network I/O, TARGET is a service name or a port number.
9262
9263 This function looks up what is specified for TARGET in
9264 `file-coding-system-alist', `process-coding-system-alist',
9265 or `network-coding-system-alist' depending on OPERATION.
9266 They may specify a coding system, a cons of coding systems,
9267 or a function symbol to call.
9268 In the last case, we call the function with one argument,
9269 which is a list of all the arguments given to this function.
9270 If the function can't decide a coding system, it can return
9271 `undecided' so that the normal code-detection is performed.
9272
9273 If OPERATION is `insert-file-contents', the argument corresponding to
9274 TARGET may be a cons (FILENAME . BUFFER). In that case, FILENAME is a
9275 file name to look up, and BUFFER is a buffer that contains the file's
9276 contents (not yet decoded). If `file-coding-system-alist' specifies a
9277 function to call for FILENAME, that function should examine the
9278 contents of BUFFER instead of reading the file.
9279
9280 usage: (find-operation-coding-system OPERATION ARGUMENTS...) */)
9281 (size_t nargs, Lisp_Object *args)
9282 {
9283 Lisp_Object operation, target_idx, target, val;
9284 register Lisp_Object chain;
9285
9286 if (nargs < 2)
9287 error ("Too few arguments");
9288 operation = args[0];
9289 if (!SYMBOLP (operation)
9290 || !NATNUMP (target_idx = Fget (operation, Qtarget_idx)))
9291 error ("Invalid first argument");
9292 if (nargs < 1 + XFASTINT (target_idx))
9293 error ("Too few arguments for operation `%s'",
9294 SDATA (SYMBOL_NAME (operation)));
9295 target = args[XFASTINT (target_idx) + 1];
9296 if (!(STRINGP (target)
9297 || (EQ (operation, Qinsert_file_contents) && CONSP (target)
9298 && STRINGP (XCAR (target)) && BUFFERP (XCDR (target)))
9299 || (EQ (operation, Qopen_network_stream) && INTEGERP (target))))
9300 error ("Invalid argument %"pI"d of operation `%s'",
9301 XFASTINT (target_idx) + 1, SDATA (SYMBOL_NAME (operation)));
9302 if (CONSP (target))
9303 target = XCAR (target);
9304
9305 chain = ((EQ (operation, Qinsert_file_contents)
9306 || EQ (operation, Qwrite_region))
9307 ? Vfile_coding_system_alist
9308 : (EQ (operation, Qopen_network_stream)
9309 ? Vnetwork_coding_system_alist
9310 : Vprocess_coding_system_alist));
9311 if (NILP (chain))
9312 return Qnil;
9313
9314 for (; CONSP (chain); chain = XCDR (chain))
9315 {
9316 Lisp_Object elt;
9317
9318 elt = XCAR (chain);
9319 if (CONSP (elt)
9320 && ((STRINGP (target)
9321 && STRINGP (XCAR (elt))
9322 && fast_string_match (XCAR (elt), target) >= 0)
9323 || (INTEGERP (target) && EQ (target, XCAR (elt)))))
9324 {
9325 val = XCDR (elt);
9326 /* Here, if VAL is both a valid coding system and a valid
9327 function symbol, we return VAL as a coding system. */
9328 if (CONSP (val))
9329 return val;
9330 if (! SYMBOLP (val))
9331 return Qnil;
9332 if (! NILP (Fcoding_system_p (val)))
9333 return Fcons (val, val);
9334 if (! NILP (Ffboundp (val)))
9335 {
9336 /* We use call1 rather than safe_call1
9337 so as to get bug reports about functions called here
9338 which don't handle the current interface. */
9339 val = call1 (val, Flist (nargs, args));
9340 if (CONSP (val))
9341 return val;
9342 if (SYMBOLP (val) && ! NILP (Fcoding_system_p (val)))
9343 return Fcons (val, val);
9344 }
9345 return Qnil;
9346 }
9347 }
9348 return Qnil;
9349 }
9350
9351 DEFUN ("set-coding-system-priority", Fset_coding_system_priority,
9352 Sset_coding_system_priority, 0, MANY, 0,
9353 doc: /* Assign higher priority to the coding systems given as arguments.
9354 If multiple coding systems belong to the same category,
9355 all but the first one are ignored.
9356
9357 usage: (set-coding-system-priority &rest coding-systems) */)
9358 (size_t nargs, Lisp_Object *args)
9359 {
9360 size_t i, j;
9361 int changed[coding_category_max];
9362 enum coding_category priorities[coding_category_max];
9363
9364 memset (changed, 0, sizeof changed);
9365
9366 for (i = j = 0; i < nargs; i++)
9367 {
9368 enum coding_category category;
9369 Lisp_Object spec, attrs;
9370
9371 CHECK_CODING_SYSTEM_GET_SPEC (args[i], spec);
9372 attrs = AREF (spec, 0);
9373 category = XINT (CODING_ATTR_CATEGORY (attrs));
9374 if (changed[category])
9375 /* Ignore this coding system because a coding system of the
9376 same category already had a higher priority. */
9377 continue;
9378 changed[category] = 1;
9379 priorities[j++] = category;
9380 if (coding_categories[category].id >= 0
9381 && ! EQ (args[i], CODING_ID_NAME (coding_categories[category].id)))
9382 setup_coding_system (args[i], &coding_categories[category]);
9383 Fset (AREF (Vcoding_category_table, category), args[i]);
9384 }
9385
9386 /* Now we have decided top J priorities. Reflect the order of the
9387 original priorities to the remaining priorities. */
9388
9389 for (i = j, j = 0; i < coding_category_max; i++, j++)
9390 {
9391 while (j < coding_category_max
9392 && changed[coding_priorities[j]])
9393 j++;
9394 if (j == coding_category_max)
9395 abort ();
9396 priorities[i] = coding_priorities[j];
9397 }
9398
9399 memcpy (coding_priorities, priorities, sizeof priorities);
9400
9401 /* Update `coding-category-list'. */
9402 Vcoding_category_list = Qnil;
9403 for (i = coding_category_max; i-- > 0; )
9404 Vcoding_category_list
9405 = Fcons (AREF (Vcoding_category_table, priorities[i]),
9406 Vcoding_category_list);
9407
9408 return Qnil;
9409 }
9410
9411 DEFUN ("coding-system-priority-list", Fcoding_system_priority_list,
9412 Scoding_system_priority_list, 0, 1, 0,
9413 doc: /* Return a list of coding systems ordered by their priorities.
9414 The list contains a subset of coding systems; i.e. coding systems
9415 assigned to each coding category (see `coding-category-list').
9416
9417 HIGHESTP non-nil means just return the highest priority one. */)
9418 (Lisp_Object highestp)
9419 {
9420 int i;
9421 Lisp_Object val;
9422
9423 for (i = 0, val = Qnil; i < coding_category_max; i++)
9424 {
9425 enum coding_category category = coding_priorities[i];
9426 int id = coding_categories[category].id;
9427 Lisp_Object attrs;
9428
9429 if (id < 0)
9430 continue;
9431 attrs = CODING_ID_ATTRS (id);
9432 if (! NILP (highestp))
9433 return CODING_ATTR_BASE_NAME (attrs);
9434 val = Fcons (CODING_ATTR_BASE_NAME (attrs), val);
9435 }
9436 return Fnreverse (val);
9437 }
9438
9439 static const char *const suffixes[] = { "-unix", "-dos", "-mac" };
9440
9441 static Lisp_Object
9442 make_subsidiaries (Lisp_Object base)
9443 {
9444 Lisp_Object subsidiaries;
9445 int base_name_len = SBYTES (SYMBOL_NAME (base));
9446 char *buf = (char *) alloca (base_name_len + 6);
9447 int i;
9448
9449 memcpy (buf, SDATA (SYMBOL_NAME (base)), base_name_len);
9450 subsidiaries = Fmake_vector (make_number (3), Qnil);
9451 for (i = 0; i < 3; i++)
9452 {
9453 memcpy (buf + base_name_len, suffixes[i], strlen (suffixes[i]) + 1);
9454 ASET (subsidiaries, i, intern (buf));
9455 }
9456 return subsidiaries;
9457 }
9458
9459
9460 DEFUN ("define-coding-system-internal", Fdefine_coding_system_internal,
9461 Sdefine_coding_system_internal, coding_arg_max, MANY, 0,
9462 doc: /* For internal use only.
9463 usage: (define-coding-system-internal ...) */)
9464 (size_t nargs, Lisp_Object *args)
9465 {
9466 Lisp_Object name;
9467 Lisp_Object spec_vec; /* [ ATTRS ALIASE EOL_TYPE ] */
9468 Lisp_Object attrs; /* Vector of attributes. */
9469 Lisp_Object eol_type;
9470 Lisp_Object aliases;
9471 Lisp_Object coding_type, charset_list, safe_charsets;
9472 enum coding_category category;
9473 Lisp_Object tail, val;
9474 int max_charset_id = 0;
9475 int i;
9476
9477 if (nargs < coding_arg_max)
9478 goto short_args;
9479
9480 attrs = Fmake_vector (make_number (coding_attr_last_index), Qnil);
9481
9482 name = args[coding_arg_name];
9483 CHECK_SYMBOL (name);
9484 CODING_ATTR_BASE_NAME (attrs) = name;
9485
9486 val = args[coding_arg_mnemonic];
9487 if (! STRINGP (val))
9488 CHECK_CHARACTER (val);
9489 CODING_ATTR_MNEMONIC (attrs) = val;
9490
9491 coding_type = args[coding_arg_coding_type];
9492 CHECK_SYMBOL (coding_type);
9493 CODING_ATTR_TYPE (attrs) = coding_type;
9494
9495 charset_list = args[coding_arg_charset_list];
9496 if (SYMBOLP (charset_list))
9497 {
9498 if (EQ (charset_list, Qiso_2022))
9499 {
9500 if (! EQ (coding_type, Qiso_2022))
9501 error ("Invalid charset-list");
9502 charset_list = Viso_2022_charset_list;
9503 }
9504 else if (EQ (charset_list, Qemacs_mule))
9505 {
9506 if (! EQ (coding_type, Qemacs_mule))
9507 error ("Invalid charset-list");
9508 charset_list = Vemacs_mule_charset_list;
9509 }
9510 for (tail = charset_list; CONSP (tail); tail = XCDR (tail))
9511 if (max_charset_id < XFASTINT (XCAR (tail)))
9512 max_charset_id = XFASTINT (XCAR (tail));
9513 }
9514 else
9515 {
9516 charset_list = Fcopy_sequence (charset_list);
9517 for (tail = charset_list; CONSP (tail); tail = XCDR (tail))
9518 {
9519 struct charset *charset;
9520
9521 val = XCAR (tail);
9522 CHECK_CHARSET_GET_CHARSET (val, charset);
9523 if (EQ (coding_type, Qiso_2022)
9524 ? CHARSET_ISO_FINAL (charset) < 0
9525 : EQ (coding_type, Qemacs_mule)
9526 ? CHARSET_EMACS_MULE_ID (charset) < 0
9527 : 0)
9528 error ("Can't handle charset `%s'",
9529 SDATA (SYMBOL_NAME (CHARSET_NAME (charset))));
9530
9531 XSETCAR (tail, make_number (charset->id));
9532 if (max_charset_id < charset->id)
9533 max_charset_id = charset->id;
9534 }
9535 }
9536 CODING_ATTR_CHARSET_LIST (attrs) = charset_list;
9537
9538 safe_charsets = make_uninit_string (max_charset_id + 1);
9539 memset (SDATA (safe_charsets), 255, max_charset_id + 1);
9540 for (tail = charset_list; CONSP (tail); tail = XCDR (tail))
9541 SSET (safe_charsets, XFASTINT (XCAR (tail)), 0);
9542 CODING_ATTR_SAFE_CHARSETS (attrs) = safe_charsets;
9543
9544 CODING_ATTR_ASCII_COMPAT (attrs) = args[coding_arg_ascii_compatible_p];
9545
9546 val = args[coding_arg_decode_translation_table];
9547 if (! CHAR_TABLE_P (val) && ! CONSP (val))
9548 CHECK_SYMBOL (val);
9549 CODING_ATTR_DECODE_TBL (attrs) = val;
9550
9551 val = args[coding_arg_encode_translation_table];
9552 if (! CHAR_TABLE_P (val) && ! CONSP (val))
9553 CHECK_SYMBOL (val);
9554 CODING_ATTR_ENCODE_TBL (attrs) = val;
9555
9556 val = args[coding_arg_post_read_conversion];
9557 CHECK_SYMBOL (val);
9558 CODING_ATTR_POST_READ (attrs) = val;
9559
9560 val = args[coding_arg_pre_write_conversion];
9561 CHECK_SYMBOL (val);
9562 CODING_ATTR_PRE_WRITE (attrs) = val;
9563
9564 val = args[coding_arg_default_char];
9565 if (NILP (val))
9566 CODING_ATTR_DEFAULT_CHAR (attrs) = make_number (' ');
9567 else
9568 {
9569 CHECK_CHARACTER (val);
9570 CODING_ATTR_DEFAULT_CHAR (attrs) = val;
9571 }
9572
9573 val = args[coding_arg_for_unibyte];
9574 CODING_ATTR_FOR_UNIBYTE (attrs) = NILP (val) ? Qnil : Qt;
9575
9576 val = args[coding_arg_plist];
9577 CHECK_LIST (val);
9578 CODING_ATTR_PLIST (attrs) = val;
9579
9580 if (EQ (coding_type, Qcharset))
9581 {
9582 /* Generate a lisp vector of 256 elements. Each element is nil,
9583 integer, or a list of charset IDs.
9584
9585 If Nth element is nil, the byte code N is invalid in this
9586 coding system.
9587
9588 If Nth element is a number NUM, N is the first byte of a
9589 charset whose ID is NUM.
9590
9591 If Nth element is a list of charset IDs, N is the first byte
9592 of one of them. The list is sorted by dimensions of the
9593 charsets. A charset of smaller dimension comes first. */
9594 val = Fmake_vector (make_number (256), Qnil);
9595
9596 for (tail = charset_list; CONSP (tail); tail = XCDR (tail))
9597 {
9598 struct charset *charset = CHARSET_FROM_ID (XFASTINT (XCAR (tail)));
9599 int dim = CHARSET_DIMENSION (charset);
9600 int idx = (dim - 1) * 4;
9601
9602 if (CHARSET_ASCII_COMPATIBLE_P (charset))
9603 CODING_ATTR_ASCII_COMPAT (attrs) = Qt;
9604
9605 for (i = charset->code_space[idx];
9606 i <= charset->code_space[idx + 1]; i++)
9607 {
9608 Lisp_Object tmp, tmp2;
9609 int dim2;
9610
9611 tmp = AREF (val, i);
9612 if (NILP (tmp))
9613 tmp = XCAR (tail);
9614 else if (NUMBERP (tmp))
9615 {
9616 dim2 = CHARSET_DIMENSION (CHARSET_FROM_ID (XFASTINT (tmp)));
9617 if (dim < dim2)
9618 tmp = Fcons (XCAR (tail), Fcons (tmp, Qnil));
9619 else
9620 tmp = Fcons (tmp, Fcons (XCAR (tail), Qnil));
9621 }
9622 else
9623 {
9624 for (tmp2 = tmp; CONSP (tmp2); tmp2 = XCDR (tmp2))
9625 {
9626 dim2 = CHARSET_DIMENSION (CHARSET_FROM_ID (XFASTINT (XCAR (tmp2))));
9627 if (dim < dim2)
9628 break;
9629 }
9630 if (NILP (tmp2))
9631 tmp = nconc2 (tmp, Fcons (XCAR (tail), Qnil));
9632 else
9633 {
9634 XSETCDR (tmp2, Fcons (XCAR (tmp2), XCDR (tmp2)));
9635 XSETCAR (tmp2, XCAR (tail));
9636 }
9637 }
9638 ASET (val, i, tmp);
9639 }
9640 }
9641 ASET (attrs, coding_attr_charset_valids, val);
9642 category = coding_category_charset;
9643 }
9644 else if (EQ (coding_type, Qccl))
9645 {
9646 Lisp_Object valids;
9647
9648 if (nargs < coding_arg_ccl_max)
9649 goto short_args;
9650
9651 val = args[coding_arg_ccl_decoder];
9652 CHECK_CCL_PROGRAM (val);
9653 if (VECTORP (val))
9654 val = Fcopy_sequence (val);
9655 ASET (attrs, coding_attr_ccl_decoder, val);
9656
9657 val = args[coding_arg_ccl_encoder];
9658 CHECK_CCL_PROGRAM (val);
9659 if (VECTORP (val))
9660 val = Fcopy_sequence (val);
9661 ASET (attrs, coding_attr_ccl_encoder, val);
9662
9663 val = args[coding_arg_ccl_valids];
9664 valids = Fmake_string (make_number (256), make_number (0));
9665 for (tail = val; !NILP (tail); tail = Fcdr (tail))
9666 {
9667 int from, to;
9668
9669 val = Fcar (tail);
9670 if (INTEGERP (val))
9671 {
9672 from = to = XINT (val);
9673 if (from < 0 || from > 255)
9674 args_out_of_range_3 (val, make_number (0), make_number (255));
9675 }
9676 else
9677 {
9678 CHECK_CONS (val);
9679 CHECK_NATNUM_CAR (val);
9680 CHECK_NATNUM_CDR (val);
9681 from = XINT (XCAR (val));
9682 if (from > 255)
9683 args_out_of_range_3 (XCAR (val),
9684 make_number (0), make_number (255));
9685 to = XINT (XCDR (val));
9686 if (to < from || to > 255)
9687 args_out_of_range_3 (XCDR (val),
9688 XCAR (val), make_number (255));
9689 }
9690 for (i = from; i <= to; i++)
9691 SSET (valids, i, 1);
9692 }
9693 ASET (attrs, coding_attr_ccl_valids, valids);
9694
9695 category = coding_category_ccl;
9696 }
9697 else if (EQ (coding_type, Qutf_16))
9698 {
9699 Lisp_Object bom, endian;
9700
9701 CODING_ATTR_ASCII_COMPAT (attrs) = Qnil;
9702
9703 if (nargs < coding_arg_utf16_max)
9704 goto short_args;
9705
9706 bom = args[coding_arg_utf16_bom];
9707 if (! NILP (bom) && ! EQ (bom, Qt))
9708 {
9709 CHECK_CONS (bom);
9710 val = XCAR (bom);
9711 CHECK_CODING_SYSTEM (val);
9712 val = XCDR (bom);
9713 CHECK_CODING_SYSTEM (val);
9714 }
9715 ASET (attrs, coding_attr_utf_bom, bom);
9716
9717 endian = args[coding_arg_utf16_endian];
9718 CHECK_SYMBOL (endian);
9719 if (NILP (endian))
9720 endian = Qbig;
9721 else if (! EQ (endian, Qbig) && ! EQ (endian, Qlittle))
9722 error ("Invalid endian: %s", SDATA (SYMBOL_NAME (endian)));
9723 ASET (attrs, coding_attr_utf_16_endian, endian);
9724
9725 category = (CONSP (bom)
9726 ? coding_category_utf_16_auto
9727 : NILP (bom)
9728 ? (EQ (endian, Qbig)
9729 ? coding_category_utf_16_be_nosig
9730 : coding_category_utf_16_le_nosig)
9731 : (EQ (endian, Qbig)
9732 ? coding_category_utf_16_be
9733 : coding_category_utf_16_le));
9734 }
9735 else if (EQ (coding_type, Qiso_2022))
9736 {
9737 Lisp_Object initial, reg_usage, request, flags;
9738
9739 if (nargs < coding_arg_iso2022_max)
9740 goto short_args;
9741
9742 initial = Fcopy_sequence (args[coding_arg_iso2022_initial]);
9743 CHECK_VECTOR (initial);
9744 for (i = 0; i < 4; i++)
9745 {
9746 val = Faref (initial, make_number (i));
9747 if (! NILP (val))
9748 {
9749 struct charset *charset;
9750
9751 CHECK_CHARSET_GET_CHARSET (val, charset);
9752 ASET (initial, i, make_number (CHARSET_ID (charset)));
9753 if (i == 0 && CHARSET_ASCII_COMPATIBLE_P (charset))
9754 CODING_ATTR_ASCII_COMPAT (attrs) = Qt;
9755 }
9756 else
9757 ASET (initial, i, make_number (-1));
9758 }
9759
9760 reg_usage = args[coding_arg_iso2022_reg_usage];
9761 CHECK_CONS (reg_usage);
9762 CHECK_NUMBER_CAR (reg_usage);
9763 CHECK_NUMBER_CDR (reg_usage);
9764
9765 request = Fcopy_sequence (args[coding_arg_iso2022_request]);
9766 for (tail = request; ! NILP (tail); tail = Fcdr (tail))
9767 {
9768 int id;
9769 Lisp_Object tmp1;
9770
9771 val = Fcar (tail);
9772 CHECK_CONS (val);
9773 tmp1 = XCAR (val);
9774 CHECK_CHARSET_GET_ID (tmp1, id);
9775 CHECK_NATNUM_CDR (val);
9776 if (XINT (XCDR (val)) >= 4)
9777 error ("Invalid graphic register number: %"pI"d", XINT (XCDR (val)));
9778 XSETCAR (val, make_number (id));
9779 }
9780
9781 flags = args[coding_arg_iso2022_flags];
9782 CHECK_NATNUM (flags);
9783 i = XINT (flags);
9784 if (EQ (args[coding_arg_charset_list], Qiso_2022))
9785 flags = make_number (i | CODING_ISO_FLAG_FULL_SUPPORT);
9786
9787 ASET (attrs, coding_attr_iso_initial, initial);
9788 ASET (attrs, coding_attr_iso_usage, reg_usage);
9789 ASET (attrs, coding_attr_iso_request, request);
9790 ASET (attrs, coding_attr_iso_flags, flags);
9791 setup_iso_safe_charsets (attrs);
9792
9793 if (i & CODING_ISO_FLAG_SEVEN_BITS)
9794 category = ((i & (CODING_ISO_FLAG_LOCKING_SHIFT
9795 | CODING_ISO_FLAG_SINGLE_SHIFT))
9796 ? coding_category_iso_7_else
9797 : EQ (args[coding_arg_charset_list], Qiso_2022)
9798 ? coding_category_iso_7
9799 : coding_category_iso_7_tight);
9800 else
9801 {
9802 int id = XINT (AREF (initial, 1));
9803
9804 category = (((i & CODING_ISO_FLAG_LOCKING_SHIFT)
9805 || EQ (args[coding_arg_charset_list], Qiso_2022)
9806 || id < 0)
9807 ? coding_category_iso_8_else
9808 : (CHARSET_DIMENSION (CHARSET_FROM_ID (id)) == 1)
9809 ? coding_category_iso_8_1
9810 : coding_category_iso_8_2);
9811 }
9812 if (category != coding_category_iso_8_1
9813 && category != coding_category_iso_8_2)
9814 CODING_ATTR_ASCII_COMPAT (attrs) = Qnil;
9815 }
9816 else if (EQ (coding_type, Qemacs_mule))
9817 {
9818 if (EQ (args[coding_arg_charset_list], Qemacs_mule))
9819 ASET (attrs, coding_attr_emacs_mule_full, Qt);
9820 CODING_ATTR_ASCII_COMPAT (attrs) = Qt;
9821 category = coding_category_emacs_mule;
9822 }
9823 else if (EQ (coding_type, Qshift_jis))
9824 {
9825
9826 struct charset *charset;
9827
9828 if (XINT (Flength (charset_list)) != 3
9829 && XINT (Flength (charset_list)) != 4)
9830 error ("There should be three or four charsets");
9831
9832 charset = CHARSET_FROM_ID (XINT (XCAR (charset_list)));
9833 if (CHARSET_DIMENSION (charset) != 1)
9834 error ("Dimension of charset %s is not one",
9835 SDATA (SYMBOL_NAME (CHARSET_NAME (charset))));
9836 if (CHARSET_ASCII_COMPATIBLE_P (charset))
9837 CODING_ATTR_ASCII_COMPAT (attrs) = Qt;
9838
9839 charset_list = XCDR (charset_list);
9840 charset = CHARSET_FROM_ID (XINT (XCAR (charset_list)));
9841 if (CHARSET_DIMENSION (charset) != 1)
9842 error ("Dimension of charset %s is not one",
9843 SDATA (SYMBOL_NAME (CHARSET_NAME (charset))));
9844
9845 charset_list = XCDR (charset_list);
9846 charset = CHARSET_FROM_ID (XINT (XCAR (charset_list)));
9847 if (CHARSET_DIMENSION (charset) != 2)
9848 error ("Dimension of charset %s is not two",
9849 SDATA (SYMBOL_NAME (CHARSET_NAME (charset))));
9850
9851 charset_list = XCDR (charset_list);
9852 if (! NILP (charset_list))
9853 {
9854 charset = CHARSET_FROM_ID (XINT (XCAR (charset_list)));
9855 if (CHARSET_DIMENSION (charset) != 2)
9856 error ("Dimension of charset %s is not two",
9857 SDATA (SYMBOL_NAME (CHARSET_NAME (charset))));
9858 }
9859
9860 category = coding_category_sjis;
9861 Vsjis_coding_system = name;
9862 }
9863 else if (EQ (coding_type, Qbig5))
9864 {
9865 struct charset *charset;
9866
9867 if (XINT (Flength (charset_list)) != 2)
9868 error ("There should be just two charsets");
9869
9870 charset = CHARSET_FROM_ID (XINT (XCAR (charset_list)));
9871 if (CHARSET_DIMENSION (charset) != 1)
9872 error ("Dimension of charset %s is not one",
9873 SDATA (SYMBOL_NAME (CHARSET_NAME (charset))));
9874 if (CHARSET_ASCII_COMPATIBLE_P (charset))
9875 CODING_ATTR_ASCII_COMPAT (attrs) = Qt;
9876
9877 charset_list = XCDR (charset_list);
9878 charset = CHARSET_FROM_ID (XINT (XCAR (charset_list)));
9879 if (CHARSET_DIMENSION (charset) != 2)
9880 error ("Dimension of charset %s is not two",
9881 SDATA (SYMBOL_NAME (CHARSET_NAME (charset))));
9882
9883 category = coding_category_big5;
9884 Vbig5_coding_system = name;
9885 }
9886 else if (EQ (coding_type, Qraw_text))
9887 {
9888 category = coding_category_raw_text;
9889 CODING_ATTR_ASCII_COMPAT (attrs) = Qt;
9890 }
9891 else if (EQ (coding_type, Qutf_8))
9892 {
9893 Lisp_Object bom;
9894
9895 CODING_ATTR_ASCII_COMPAT (attrs) = Qt;
9896
9897 if (nargs < coding_arg_utf8_max)
9898 goto short_args;
9899
9900 bom = args[coding_arg_utf8_bom];
9901 if (! NILP (bom) && ! EQ (bom, Qt))
9902 {
9903 CHECK_CONS (bom);
9904 val = XCAR (bom);
9905 CHECK_CODING_SYSTEM (val);
9906 val = XCDR (bom);
9907 CHECK_CODING_SYSTEM (val);
9908 }
9909 ASET (attrs, coding_attr_utf_bom, bom);
9910
9911 category = (CONSP (bom) ? coding_category_utf_8_auto
9912 : NILP (bom) ? coding_category_utf_8_nosig
9913 : coding_category_utf_8_sig);
9914 }
9915 else if (EQ (coding_type, Qundecided))
9916 category = coding_category_undecided;
9917 else
9918 error ("Invalid coding system type: %s",
9919 SDATA (SYMBOL_NAME (coding_type)));
9920
9921 CODING_ATTR_CATEGORY (attrs) = make_number (category);
9922 CODING_ATTR_PLIST (attrs)
9923 = Fcons (QCcategory, Fcons (AREF (Vcoding_category_table, category),
9924 CODING_ATTR_PLIST (attrs)));
9925 CODING_ATTR_PLIST (attrs)
9926 = Fcons (QCascii_compatible_p,
9927 Fcons (CODING_ATTR_ASCII_COMPAT (attrs),
9928 CODING_ATTR_PLIST (attrs)));
9929
9930 eol_type = args[coding_arg_eol_type];
9931 if (! NILP (eol_type)
9932 && ! EQ (eol_type, Qunix)
9933 && ! EQ (eol_type, Qdos)
9934 && ! EQ (eol_type, Qmac))
9935 error ("Invalid eol-type");
9936
9937 aliases = Fcons (name, Qnil);
9938
9939 if (NILP (eol_type))
9940 {
9941 eol_type = make_subsidiaries (name);
9942 for (i = 0; i < 3; i++)
9943 {
9944 Lisp_Object this_spec, this_name, this_aliases, this_eol_type;
9945
9946 this_name = AREF (eol_type, i);
9947 this_aliases = Fcons (this_name, Qnil);
9948 this_eol_type = (i == 0 ? Qunix : i == 1 ? Qdos : Qmac);
9949 this_spec = Fmake_vector (make_number (3), attrs);
9950 ASET (this_spec, 1, this_aliases);
9951 ASET (this_spec, 2, this_eol_type);
9952 Fputhash (this_name, this_spec, Vcoding_system_hash_table);
9953 Vcoding_system_list = Fcons (this_name, Vcoding_system_list);
9954 val = Fassoc (Fsymbol_name (this_name), Vcoding_system_alist);
9955 if (NILP (val))
9956 Vcoding_system_alist
9957 = Fcons (Fcons (Fsymbol_name (this_name), Qnil),
9958 Vcoding_system_alist);
9959 }
9960 }
9961
9962 spec_vec = Fmake_vector (make_number (3), attrs);
9963 ASET (spec_vec, 1, aliases);
9964 ASET (spec_vec, 2, eol_type);
9965
9966 Fputhash (name, spec_vec, Vcoding_system_hash_table);
9967 Vcoding_system_list = Fcons (name, Vcoding_system_list);
9968 val = Fassoc (Fsymbol_name (name), Vcoding_system_alist);
9969 if (NILP (val))
9970 Vcoding_system_alist = Fcons (Fcons (Fsymbol_name (name), Qnil),
9971 Vcoding_system_alist);
9972
9973 {
9974 int id = coding_categories[category].id;
9975
9976 if (id < 0 || EQ (name, CODING_ID_NAME (id)))
9977 setup_coding_system (name, &coding_categories[category]);
9978 }
9979
9980 return Qnil;
9981
9982 short_args:
9983 return Fsignal (Qwrong_number_of_arguments,
9984 Fcons (intern ("define-coding-system-internal"),
9985 make_number (nargs)));
9986 }
9987
9988
9989 DEFUN ("coding-system-put", Fcoding_system_put, Scoding_system_put,
9990 3, 3, 0,
9991 doc: /* Change value in CODING-SYSTEM's property list PROP to VAL. */)
9992 (Lisp_Object coding_system, Lisp_Object prop, Lisp_Object val)
9993 {
9994 Lisp_Object spec, attrs;
9995
9996 CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec);
9997 attrs = AREF (spec, 0);
9998 if (EQ (prop, QCmnemonic))
9999 {
10000 if (! STRINGP (val))
10001 CHECK_CHARACTER (val);
10002 CODING_ATTR_MNEMONIC (attrs) = val;
10003 }
10004 else if (EQ (prop, QCdefault_char))
10005 {
10006 if (NILP (val))
10007 val = make_number (' ');
10008 else
10009 CHECK_CHARACTER (val);
10010 CODING_ATTR_DEFAULT_CHAR (attrs) = val;
10011 }
10012 else if (EQ (prop, QCdecode_translation_table))
10013 {
10014 if (! CHAR_TABLE_P (val) && ! CONSP (val))
10015 CHECK_SYMBOL (val);
10016 CODING_ATTR_DECODE_TBL (attrs) = val;
10017 }
10018 else if (EQ (prop, QCencode_translation_table))
10019 {
10020 if (! CHAR_TABLE_P (val) && ! CONSP (val))
10021 CHECK_SYMBOL (val);
10022 CODING_ATTR_ENCODE_TBL (attrs) = val;
10023 }
10024 else if (EQ (prop, QCpost_read_conversion))
10025 {
10026 CHECK_SYMBOL (val);
10027 CODING_ATTR_POST_READ (attrs) = val;
10028 }
10029 else if (EQ (prop, QCpre_write_conversion))
10030 {
10031 CHECK_SYMBOL (val);
10032 CODING_ATTR_PRE_WRITE (attrs) = val;
10033 }
10034 else if (EQ (prop, QCascii_compatible_p))
10035 {
10036 CODING_ATTR_ASCII_COMPAT (attrs) = val;
10037 }
10038
10039 CODING_ATTR_PLIST (attrs)
10040 = Fplist_put (CODING_ATTR_PLIST (attrs), prop, val);
10041 return val;
10042 }
10043
10044
10045 DEFUN ("define-coding-system-alias", Fdefine_coding_system_alias,
10046 Sdefine_coding_system_alias, 2, 2, 0,
10047 doc: /* Define ALIAS as an alias for CODING-SYSTEM. */)
10048 (Lisp_Object alias, Lisp_Object coding_system)
10049 {
10050 Lisp_Object spec, aliases, eol_type, val;
10051
10052 CHECK_SYMBOL (alias);
10053 CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec);
10054 aliases = AREF (spec, 1);
10055 /* ALIASES should be a list of length more than zero, and the first
10056 element is a base coding system. Append ALIAS at the tail of the
10057 list. */
10058 while (!NILP (XCDR (aliases)))
10059 aliases = XCDR (aliases);
10060 XSETCDR (aliases, Fcons (alias, Qnil));
10061
10062 eol_type = AREF (spec, 2);
10063 if (VECTORP (eol_type))
10064 {
10065 Lisp_Object subsidiaries;
10066 int i;
10067
10068 subsidiaries = make_subsidiaries (alias);
10069 for (i = 0; i < 3; i++)
10070 Fdefine_coding_system_alias (AREF (subsidiaries, i),
10071 AREF (eol_type, i));
10072 }
10073
10074 Fputhash (alias, spec, Vcoding_system_hash_table);
10075 Vcoding_system_list = Fcons (alias, Vcoding_system_list);
10076 val = Fassoc (Fsymbol_name (alias), Vcoding_system_alist);
10077 if (NILP (val))
10078 Vcoding_system_alist = Fcons (Fcons (Fsymbol_name (alias), Qnil),
10079 Vcoding_system_alist);
10080
10081 return Qnil;
10082 }
10083
10084 DEFUN ("coding-system-base", Fcoding_system_base, Scoding_system_base,
10085 1, 1, 0,
10086 doc: /* Return the base of CODING-SYSTEM.
10087 Any alias or subsidiary coding system is not a base coding system. */)
10088 (Lisp_Object coding_system)
10089 {
10090 Lisp_Object spec, attrs;
10091
10092 if (NILP (coding_system))
10093 return (Qno_conversion);
10094 CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec);
10095 attrs = AREF (spec, 0);
10096 return CODING_ATTR_BASE_NAME (attrs);
10097 }
10098
10099 DEFUN ("coding-system-plist", Fcoding_system_plist, Scoding_system_plist,
10100 1, 1, 0,
10101 doc: "Return the property list of CODING-SYSTEM.")
10102 (Lisp_Object coding_system)
10103 {
10104 Lisp_Object spec, attrs;
10105
10106 if (NILP (coding_system))
10107 coding_system = Qno_conversion;
10108 CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec);
10109 attrs = AREF (spec, 0);
10110 return CODING_ATTR_PLIST (attrs);
10111 }
10112
10113
10114 DEFUN ("coding-system-aliases", Fcoding_system_aliases, Scoding_system_aliases,
10115 1, 1, 0,
10116 doc: /* Return the list of aliases of CODING-SYSTEM. */)
10117 (Lisp_Object coding_system)
10118 {
10119 Lisp_Object spec;
10120
10121 if (NILP (coding_system))
10122 coding_system = Qno_conversion;
10123 CHECK_CODING_SYSTEM_GET_SPEC (coding_system, spec);
10124 return AREF (spec, 1);
10125 }
10126
10127 DEFUN ("coding-system-eol-type", Fcoding_system_eol_type,
10128 Scoding_system_eol_type, 1, 1, 0,
10129 doc: /* Return eol-type of CODING-SYSTEM.
10130 An eol-type is an integer 0, 1, 2, or a vector of coding systems.
10131
10132 Integer values 0, 1, and 2 indicate a format of end-of-line; LF, CRLF,
10133 and CR respectively.
10134
10135 A vector value indicates that a format of end-of-line should be
10136 detected automatically. Nth element of the vector is the subsidiary
10137 coding system whose eol-type is N. */)
10138 (Lisp_Object coding_system)
10139 {
10140 Lisp_Object spec, eol_type;
10141 int n;
10142
10143 if (NILP (coding_system))
10144 coding_system = Qno_conversion;
10145 if (! CODING_SYSTEM_P (coding_system))
10146 return Qnil;
10147 spec = CODING_SYSTEM_SPEC (coding_system);
10148 eol_type = AREF (spec, 2);
10149 if (VECTORP (eol_type))
10150 return Fcopy_sequence (eol_type);
10151 n = EQ (eol_type, Qunix) ? 0 : EQ (eol_type, Qdos) ? 1 : 2;
10152 return make_number (n);
10153 }
10154
10155 #endif /* emacs */
10156
10157 \f
10158 /*** 9. Post-amble ***/
10159
10160 void
10161 init_coding_once (void)
10162 {
10163 int i;
10164
10165 for (i = 0; i < coding_category_max; i++)
10166 {
10167 coding_categories[i].id = -1;
10168 coding_priorities[i] = i;
10169 }
10170
10171 /* ISO2022 specific initialize routine. */
10172 for (i = 0; i < 0x20; i++)
10173 iso_code_class[i] = ISO_control_0;
10174 for (i = 0x21; i < 0x7F; i++)
10175 iso_code_class[i] = ISO_graphic_plane_0;
10176 for (i = 0x80; i < 0xA0; i++)
10177 iso_code_class[i] = ISO_control_1;
10178 for (i = 0xA1; i < 0xFF; i++)
10179 iso_code_class[i] = ISO_graphic_plane_1;
10180 iso_code_class[0x20] = iso_code_class[0x7F] = ISO_0x20_or_0x7F;
10181 iso_code_class[0xA0] = iso_code_class[0xFF] = ISO_0xA0_or_0xFF;
10182 iso_code_class[ISO_CODE_SO] = ISO_shift_out;
10183 iso_code_class[ISO_CODE_SI] = ISO_shift_in;
10184 iso_code_class[ISO_CODE_SS2_7] = ISO_single_shift_2_7;
10185 iso_code_class[ISO_CODE_ESC] = ISO_escape;
10186 iso_code_class[ISO_CODE_SS2] = ISO_single_shift_2;
10187 iso_code_class[ISO_CODE_SS3] = ISO_single_shift_3;
10188 iso_code_class[ISO_CODE_CSI] = ISO_control_sequence_introducer;
10189
10190 for (i = 0; i < 256; i++)
10191 {
10192 emacs_mule_bytes[i] = 1;
10193 }
10194 emacs_mule_bytes[EMACS_MULE_LEADING_CODE_PRIVATE_11] = 3;
10195 emacs_mule_bytes[EMACS_MULE_LEADING_CODE_PRIVATE_12] = 3;
10196 emacs_mule_bytes[EMACS_MULE_LEADING_CODE_PRIVATE_21] = 4;
10197 emacs_mule_bytes[EMACS_MULE_LEADING_CODE_PRIVATE_22] = 4;
10198 }
10199
10200 #ifdef emacs
10201
10202 void
10203 syms_of_coding (void)
10204 {
10205 staticpro (&Vcoding_system_hash_table);
10206 {
10207 Lisp_Object args[2];
10208 args[0] = QCtest;
10209 args[1] = Qeq;
10210 Vcoding_system_hash_table = Fmake_hash_table (2, args);
10211 }
10212
10213 staticpro (&Vsjis_coding_system);
10214 Vsjis_coding_system = Qnil;
10215
10216 staticpro (&Vbig5_coding_system);
10217 Vbig5_coding_system = Qnil;
10218
10219 staticpro (&Vcode_conversion_reused_workbuf);
10220 Vcode_conversion_reused_workbuf = Qnil;
10221
10222 staticpro (&Vcode_conversion_workbuf_name);
10223 Vcode_conversion_workbuf_name = make_pure_c_string (" *code-conversion-work*");
10224
10225 reused_workbuf_in_use = 0;
10226
10227 DEFSYM (Qcharset, "charset");
10228 DEFSYM (Qtarget_idx, "target-idx");
10229 DEFSYM (Qcoding_system_history, "coding-system-history");
10230 Fset (Qcoding_system_history, Qnil);
10231
10232 /* Target FILENAME is the first argument. */
10233 Fput (Qinsert_file_contents, Qtarget_idx, make_number (0));
10234 /* Target FILENAME is the third argument. */
10235 Fput (Qwrite_region, Qtarget_idx, make_number (2));
10236
10237 DEFSYM (Qcall_process, "call-process");
10238 /* Target PROGRAM is the first argument. */
10239 Fput (Qcall_process, Qtarget_idx, make_number (0));
10240
10241 DEFSYM (Qcall_process_region, "call-process-region");
10242 /* Target PROGRAM is the third argument. */
10243 Fput (Qcall_process_region, Qtarget_idx, make_number (2));
10244
10245 DEFSYM (Qstart_process, "start-process");
10246 /* Target PROGRAM is the third argument. */
10247 Fput (Qstart_process, Qtarget_idx, make_number (2));
10248
10249 DEFSYM (Qopen_network_stream, "open-network-stream");
10250 /* Target SERVICE is the fourth argument. */
10251 Fput (Qopen_network_stream, Qtarget_idx, make_number (3));
10252
10253 DEFSYM (Qcoding_system, "coding-system");
10254 DEFSYM (Qcoding_aliases, "coding-aliases");
10255
10256 DEFSYM (Qeol_type, "eol-type");
10257 DEFSYM (Qunix, "unix");
10258 DEFSYM (Qdos, "dos");
10259
10260 DEFSYM (Qbuffer_file_coding_system, "buffer-file-coding-system");
10261 DEFSYM (Qpost_read_conversion, "post-read-conversion");
10262 DEFSYM (Qpre_write_conversion, "pre-write-conversion");
10263 DEFSYM (Qdefault_char, "default-char");
10264 DEFSYM (Qundecided, "undecided");
10265 DEFSYM (Qno_conversion, "no-conversion");
10266 DEFSYM (Qraw_text, "raw-text");
10267
10268 DEFSYM (Qiso_2022, "iso-2022");
10269
10270 DEFSYM (Qutf_8, "utf-8");
10271 DEFSYM (Qutf_8_emacs, "utf-8-emacs");
10272
10273 DEFSYM (Qutf_16, "utf-16");
10274 DEFSYM (Qbig, "big");
10275 DEFSYM (Qlittle, "little");
10276
10277 DEFSYM (Qshift_jis, "shift-jis");
10278 DEFSYM (Qbig5, "big5");
10279
10280 DEFSYM (Qcoding_system_p, "coding-system-p");
10281
10282 DEFSYM (Qcoding_system_error, "coding-system-error");
10283 Fput (Qcoding_system_error, Qerror_conditions,
10284 pure_cons (Qcoding_system_error, pure_cons (Qerror, Qnil)));
10285 Fput (Qcoding_system_error, Qerror_message,
10286 make_pure_c_string ("Invalid coding system"));
10287
10288 /* Intern this now in case it isn't already done.
10289 Setting this variable twice is harmless.
10290 But don't staticpro it here--that is done in alloc.c. */
10291 Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots");
10292
10293 DEFSYM (Qtranslation_table, "translation-table");
10294 Fput (Qtranslation_table, Qchar_table_extra_slots, make_number (2));
10295 DEFSYM (Qtranslation_table_id, "translation-table-id");
10296 DEFSYM (Qtranslation_table_for_decode, "translation-table-for-decode");
10297 DEFSYM (Qtranslation_table_for_encode, "translation-table-for-encode");
10298
10299 DEFSYM (Qvalid_codes, "valid-codes");
10300
10301 DEFSYM (Qemacs_mule, "emacs-mule");
10302
10303 DEFSYM (QCcategory, ":category");
10304 DEFSYM (QCmnemonic, ":mnemonic");
10305 DEFSYM (QCdefault_char, ":default-char");
10306 DEFSYM (QCdecode_translation_table, ":decode-translation-table");
10307 DEFSYM (QCencode_translation_table, ":encode-translation-table");
10308 DEFSYM (QCpost_read_conversion, ":post-read-conversion");
10309 DEFSYM (QCpre_write_conversion, ":pre-write-conversion");
10310 DEFSYM (QCascii_compatible_p, ":ascii-compatible-p");
10311
10312 Vcoding_category_table
10313 = Fmake_vector (make_number (coding_category_max), Qnil);
10314 staticpro (&Vcoding_category_table);
10315 /* Followings are target of code detection. */
10316 ASET (Vcoding_category_table, coding_category_iso_7,
10317 intern_c_string ("coding-category-iso-7"));
10318 ASET (Vcoding_category_table, coding_category_iso_7_tight,
10319 intern_c_string ("coding-category-iso-7-tight"));
10320 ASET (Vcoding_category_table, coding_category_iso_8_1,
10321 intern_c_string ("coding-category-iso-8-1"));
10322 ASET (Vcoding_category_table, coding_category_iso_8_2,
10323 intern_c_string ("coding-category-iso-8-2"));
10324 ASET (Vcoding_category_table, coding_category_iso_7_else,
10325 intern_c_string ("coding-category-iso-7-else"));
10326 ASET (Vcoding_category_table, coding_category_iso_8_else,
10327 intern_c_string ("coding-category-iso-8-else"));
10328 ASET (Vcoding_category_table, coding_category_utf_8_auto,
10329 intern_c_string ("coding-category-utf-8-auto"));
10330 ASET (Vcoding_category_table, coding_category_utf_8_nosig,
10331 intern_c_string ("coding-category-utf-8"));
10332 ASET (Vcoding_category_table, coding_category_utf_8_sig,
10333 intern_c_string ("coding-category-utf-8-sig"));
10334 ASET (Vcoding_category_table, coding_category_utf_16_be,
10335 intern_c_string ("coding-category-utf-16-be"));
10336 ASET (Vcoding_category_table, coding_category_utf_16_auto,
10337 intern_c_string ("coding-category-utf-16-auto"));
10338 ASET (Vcoding_category_table, coding_category_utf_16_le,
10339 intern_c_string ("coding-category-utf-16-le"));
10340 ASET (Vcoding_category_table, coding_category_utf_16_be_nosig,
10341 intern_c_string ("coding-category-utf-16-be-nosig"));
10342 ASET (Vcoding_category_table, coding_category_utf_16_le_nosig,
10343 intern_c_string ("coding-category-utf-16-le-nosig"));
10344 ASET (Vcoding_category_table, coding_category_charset,
10345 intern_c_string ("coding-category-charset"));
10346 ASET (Vcoding_category_table, coding_category_sjis,
10347 intern_c_string ("coding-category-sjis"));
10348 ASET (Vcoding_category_table, coding_category_big5,
10349 intern_c_string ("coding-category-big5"));
10350 ASET (Vcoding_category_table, coding_category_ccl,
10351 intern_c_string ("coding-category-ccl"));
10352 ASET (Vcoding_category_table, coding_category_emacs_mule,
10353 intern_c_string ("coding-category-emacs-mule"));
10354 /* Followings are NOT target of code detection. */
10355 ASET (Vcoding_category_table, coding_category_raw_text,
10356 intern_c_string ("coding-category-raw-text"));
10357 ASET (Vcoding_category_table, coding_category_undecided,
10358 intern_c_string ("coding-category-undecided"));
10359
10360 DEFSYM (Qinsufficient_source, "insufficient-source");
10361 DEFSYM (Qinconsistent_eol, "inconsistent-eol");
10362 DEFSYM (Qinvalid_source, "invalid-source");
10363 DEFSYM (Qinterrupted, "interrupted");
10364 DEFSYM (Qinsufficient_memory, "insufficient-memory");
10365 DEFSYM (Qcoding_system_define_form, "coding-system-define-form");
10366
10367 defsubr (&Scoding_system_p);
10368 defsubr (&Sread_coding_system);
10369 defsubr (&Sread_non_nil_coding_system);
10370 defsubr (&Scheck_coding_system);
10371 defsubr (&Sdetect_coding_region);
10372 defsubr (&Sdetect_coding_string);
10373 defsubr (&Sfind_coding_systems_region_internal);
10374 defsubr (&Sunencodable_char_position);
10375 defsubr (&Scheck_coding_systems_region);
10376 defsubr (&Sdecode_coding_region);
10377 defsubr (&Sencode_coding_region);
10378 defsubr (&Sdecode_coding_string);
10379 defsubr (&Sencode_coding_string);
10380 defsubr (&Sdecode_sjis_char);
10381 defsubr (&Sencode_sjis_char);
10382 defsubr (&Sdecode_big5_char);
10383 defsubr (&Sencode_big5_char);
10384 defsubr (&Sset_terminal_coding_system_internal);
10385 defsubr (&Sset_safe_terminal_coding_system_internal);
10386 defsubr (&Sterminal_coding_system);
10387 defsubr (&Sset_keyboard_coding_system_internal);
10388 defsubr (&Skeyboard_coding_system);
10389 defsubr (&Sfind_operation_coding_system);
10390 defsubr (&Sset_coding_system_priority);
10391 defsubr (&Sdefine_coding_system_internal);
10392 defsubr (&Sdefine_coding_system_alias);
10393 defsubr (&Scoding_system_put);
10394 defsubr (&Scoding_system_base);
10395 defsubr (&Scoding_system_plist);
10396 defsubr (&Scoding_system_aliases);
10397 defsubr (&Scoding_system_eol_type);
10398 defsubr (&Scoding_system_priority_list);
10399
10400 DEFVAR_LISP ("coding-system-list", Vcoding_system_list,
10401 doc: /* List of coding systems.
10402
10403 Do not alter the value of this variable manually. This variable should be
10404 updated by the functions `define-coding-system' and
10405 `define-coding-system-alias'. */);
10406 Vcoding_system_list = Qnil;
10407
10408 DEFVAR_LISP ("coding-system-alist", Vcoding_system_alist,
10409 doc: /* Alist of coding system names.
10410 Each element is one element list of coding system name.
10411 This variable is given to `completing-read' as COLLECTION argument.
10412
10413 Do not alter the value of this variable manually. This variable should be
10414 updated by the functions `make-coding-system' and
10415 `define-coding-system-alias'. */);
10416 Vcoding_system_alist = Qnil;
10417
10418 DEFVAR_LISP ("coding-category-list", Vcoding_category_list,
10419 doc: /* List of coding-categories (symbols) ordered by priority.
10420
10421 On detecting a coding system, Emacs tries code detection algorithms
10422 associated with each coding-category one by one in this order. When
10423 one algorithm agrees with a byte sequence of source text, the coding
10424 system bound to the corresponding coding-category is selected.
10425
10426 Don't modify this variable directly, but use `set-coding-system-priority'. */);
10427 {
10428 int i;
10429
10430 Vcoding_category_list = Qnil;
10431 for (i = coding_category_max - 1; i >= 0; i--)
10432 Vcoding_category_list
10433 = Fcons (XVECTOR (Vcoding_category_table)->contents[i],
10434 Vcoding_category_list);
10435 }
10436
10437 DEFVAR_LISP ("coding-system-for-read", Vcoding_system_for_read,
10438 doc: /* Specify the coding system for read operations.
10439 It is useful to bind this variable with `let', but do not set it globally.
10440 If the value is a coding system, it is used for decoding on read operation.
10441 If not, an appropriate element is used from one of the coding system alists.
10442 There are three such tables: `file-coding-system-alist',
10443 `process-coding-system-alist', and `network-coding-system-alist'. */);
10444 Vcoding_system_for_read = Qnil;
10445
10446 DEFVAR_LISP ("coding-system-for-write", Vcoding_system_for_write,
10447 doc: /* Specify the coding system for write operations.
10448 Programs bind this variable with `let', but you should not set it globally.
10449 If the value is a coding system, it is used for encoding of output,
10450 when writing it to a file and when sending it to a file or subprocess.
10451
10452 If this does not specify a coding system, an appropriate element
10453 is used from one of the coding system alists.
10454 There are three such tables: `file-coding-system-alist',
10455 `process-coding-system-alist', and `network-coding-system-alist'.
10456 For output to files, if the above procedure does not specify a coding system,
10457 the value of `buffer-file-coding-system' is used. */);
10458 Vcoding_system_for_write = Qnil;
10459
10460 DEFVAR_LISP ("last-coding-system-used", Vlast_coding_system_used,
10461 doc: /*
10462 Coding system used in the latest file or process I/O. */);
10463 Vlast_coding_system_used = Qnil;
10464
10465 DEFVAR_LISP ("last-code-conversion-error", Vlast_code_conversion_error,
10466 doc: /*
10467 Error status of the last code conversion.
10468
10469 When an error was detected in the last code conversion, this variable
10470 is set to one of the following symbols.
10471 `insufficient-source'
10472 `inconsistent-eol'
10473 `invalid-source'
10474 `interrupted'
10475 `insufficient-memory'
10476 When no error was detected, the value doesn't change. So, to check
10477 the error status of a code conversion by this variable, you must
10478 explicitly set this variable to nil before performing code
10479 conversion. */);
10480 Vlast_code_conversion_error = Qnil;
10481
10482 DEFVAR_BOOL ("inhibit-eol-conversion", inhibit_eol_conversion,
10483 doc: /*
10484 *Non-nil means always inhibit code conversion of end-of-line format.
10485 See info node `Coding Systems' and info node `Text and Binary' concerning
10486 such conversion. */);
10487 inhibit_eol_conversion = 0;
10488
10489 DEFVAR_BOOL ("inherit-process-coding-system", inherit_process_coding_system,
10490 doc: /*
10491 Non-nil means process buffer inherits coding system of process output.
10492 Bind it to t if the process output is to be treated as if it were a file
10493 read from some filesystem. */);
10494 inherit_process_coding_system = 0;
10495
10496 DEFVAR_LISP ("file-coding-system-alist", Vfile_coding_system_alist,
10497 doc: /*
10498 Alist to decide a coding system to use for a file I/O operation.
10499 The format is ((PATTERN . VAL) ...),
10500 where PATTERN is a regular expression matching a file name,
10501 VAL is a coding system, a cons of coding systems, or a function symbol.
10502 If VAL is a coding system, it is used for both decoding and encoding
10503 the file contents.
10504 If VAL is a cons of coding systems, the car part is used for decoding,
10505 and the cdr part is used for encoding.
10506 If VAL is a function symbol, the function must return a coding system
10507 or a cons of coding systems which are used as above. The function is
10508 called with an argument that is a list of the arguments with which
10509 `find-operation-coding-system' was called. If the function can't decide
10510 a coding system, it can return `undecided' so that the normal
10511 code-detection is performed.
10512
10513 See also the function `find-operation-coding-system'
10514 and the variable `auto-coding-alist'. */);
10515 Vfile_coding_system_alist = Qnil;
10516
10517 DEFVAR_LISP ("process-coding-system-alist", Vprocess_coding_system_alist,
10518 doc: /*
10519 Alist to decide a coding system to use for a process I/O operation.
10520 The format is ((PATTERN . VAL) ...),
10521 where PATTERN is a regular expression matching a program name,
10522 VAL is a coding system, a cons of coding systems, or a function symbol.
10523 If VAL is a coding system, it is used for both decoding what received
10524 from the program and encoding what sent to the program.
10525 If VAL is a cons of coding systems, the car part is used for decoding,
10526 and the cdr part is used for encoding.
10527 If VAL is a function symbol, the function must return a coding system
10528 or a cons of coding systems which are used as above.
10529
10530 See also the function `find-operation-coding-system'. */);
10531 Vprocess_coding_system_alist = Qnil;
10532
10533 DEFVAR_LISP ("network-coding-system-alist", Vnetwork_coding_system_alist,
10534 doc: /*
10535 Alist to decide a coding system to use for a network I/O operation.
10536 The format is ((PATTERN . VAL) ...),
10537 where PATTERN is a regular expression matching a network service name
10538 or is a port number to connect to,
10539 VAL is a coding system, a cons of coding systems, or a function symbol.
10540 If VAL is a coding system, it is used for both decoding what received
10541 from the network stream and encoding what sent to the network stream.
10542 If VAL is a cons of coding systems, the car part is used for decoding,
10543 and the cdr part is used for encoding.
10544 If VAL is a function symbol, the function must return a coding system
10545 or a cons of coding systems which are used as above.
10546
10547 See also the function `find-operation-coding-system'. */);
10548 Vnetwork_coding_system_alist = Qnil;
10549
10550 DEFVAR_LISP ("locale-coding-system", Vlocale_coding_system,
10551 doc: /* Coding system to use with system messages.
10552 Also used for decoding keyboard input on X Window system. */);
10553 Vlocale_coding_system = Qnil;
10554
10555 /* The eol mnemonics are reset in startup.el system-dependently. */
10556 DEFVAR_LISP ("eol-mnemonic-unix", eol_mnemonic_unix,
10557 doc: /*
10558 *String displayed in mode line for UNIX-like (LF) end-of-line format. */);
10559 eol_mnemonic_unix = make_pure_c_string (":");
10560
10561 DEFVAR_LISP ("eol-mnemonic-dos", eol_mnemonic_dos,
10562 doc: /*
10563 *String displayed in mode line for DOS-like (CRLF) end-of-line format. */);
10564 eol_mnemonic_dos = make_pure_c_string ("\\");
10565
10566 DEFVAR_LISP ("eol-mnemonic-mac", eol_mnemonic_mac,
10567 doc: /*
10568 *String displayed in mode line for MAC-like (CR) end-of-line format. */);
10569 eol_mnemonic_mac = make_pure_c_string ("/");
10570
10571 DEFVAR_LISP ("eol-mnemonic-undecided", eol_mnemonic_undecided,
10572 doc: /*
10573 *String displayed in mode line when end-of-line format is not yet determined. */);
10574 eol_mnemonic_undecided = make_pure_c_string (":");
10575
10576 DEFVAR_LISP ("enable-character-translation", Venable_character_translation,
10577 doc: /*
10578 *Non-nil enables character translation while encoding and decoding. */);
10579 Venable_character_translation = Qt;
10580
10581 DEFVAR_LISP ("standard-translation-table-for-decode",
10582 Vstandard_translation_table_for_decode,
10583 doc: /* Table for translating characters while decoding. */);
10584 Vstandard_translation_table_for_decode = Qnil;
10585
10586 DEFVAR_LISP ("standard-translation-table-for-encode",
10587 Vstandard_translation_table_for_encode,
10588 doc: /* Table for translating characters while encoding. */);
10589 Vstandard_translation_table_for_encode = Qnil;
10590
10591 DEFVAR_LISP ("charset-revision-table", Vcharset_revision_table,
10592 doc: /* Alist of charsets vs revision numbers.
10593 While encoding, if a charset (car part of an element) is found,
10594 designate it with the escape sequence identifying revision (cdr part
10595 of the element). */);
10596 Vcharset_revision_table = Qnil;
10597
10598 DEFVAR_LISP ("default-process-coding-system",
10599 Vdefault_process_coding_system,
10600 doc: /* Cons of coding systems used for process I/O by default.
10601 The car part is used for decoding a process output,
10602 the cdr part is used for encoding a text to be sent to a process. */);
10603 Vdefault_process_coding_system = Qnil;
10604
10605 DEFVAR_LISP ("latin-extra-code-table", Vlatin_extra_code_table,
10606 doc: /*
10607 Table of extra Latin codes in the range 128..159 (inclusive).
10608 This is a vector of length 256.
10609 If Nth element is non-nil, the existence of code N in a file
10610 \(or output of subprocess) doesn't prevent it to be detected as
10611 a coding system of ISO 2022 variant which has a flag
10612 `accept-latin-extra-code' t (e.g. iso-latin-1) on reading a file
10613 or reading output of a subprocess.
10614 Only 128th through 159th elements have a meaning. */);
10615 Vlatin_extra_code_table = Fmake_vector (make_number (256), Qnil);
10616
10617 DEFVAR_LISP ("select-safe-coding-system-function",
10618 Vselect_safe_coding_system_function,
10619 doc: /*
10620 Function to call to select safe coding system for encoding a text.
10621
10622 If set, this function is called to force a user to select a proper
10623 coding system which can encode the text in the case that a default
10624 coding system used in each operation can't encode the text. The
10625 function should take care that the buffer is not modified while
10626 the coding system is being selected.
10627
10628 The default value is `select-safe-coding-system' (which see). */);
10629 Vselect_safe_coding_system_function = Qnil;
10630
10631 DEFVAR_BOOL ("coding-system-require-warning",
10632 coding_system_require_warning,
10633 doc: /* Internal use only.
10634 If non-nil, on writing a file, `select-safe-coding-system-function' is
10635 called even if `coding-system-for-write' is non-nil. The command
10636 `universal-coding-system-argument' binds this variable to t temporarily. */);
10637 coding_system_require_warning = 0;
10638
10639
10640 DEFVAR_BOOL ("inhibit-iso-escape-detection",
10641 inhibit_iso_escape_detection,
10642 doc: /*
10643 If non-nil, Emacs ignores ISO-2022 escape sequences during code detection.
10644
10645 When Emacs reads text, it tries to detect how the text is encoded.
10646 This code detection is sensitive to escape sequences. If Emacs sees
10647 a valid ISO-2022 escape sequence, it assumes the text is encoded in one
10648 of the ISO2022 encodings, and decodes text by the corresponding coding
10649 system (e.g. `iso-2022-7bit').
10650
10651 However, there may be a case that you want to read escape sequences in
10652 a file as is. In such a case, you can set this variable to non-nil.
10653 Then the code detection will ignore any escape sequences, and no text is
10654 detected as encoded in some ISO-2022 encoding. The result is that all
10655 escape sequences become visible in a buffer.
10656
10657 The default value is nil, and it is strongly recommended not to change
10658 it. That is because many Emacs Lisp source files that contain
10659 non-ASCII characters are encoded by the coding system `iso-2022-7bit'
10660 in Emacs's distribution, and they won't be decoded correctly on
10661 reading if you suppress escape sequence detection.
10662
10663 The other way to read escape sequences in a file without decoding is
10664 to explicitly specify some coding system that doesn't use ISO-2022
10665 escape sequence (e.g `latin-1') on reading by \\[universal-coding-system-argument]. */);
10666 inhibit_iso_escape_detection = 0;
10667
10668 DEFVAR_BOOL ("inhibit-null-byte-detection",
10669 inhibit_null_byte_detection,
10670 doc: /* If non-nil, Emacs ignores null bytes on code detection.
10671 By default, Emacs treats it as binary data, and does not attempt to
10672 decode it. The effect is as if you specified `no-conversion' for
10673 reading that text.
10674
10675 Set this to non-nil when a regular text happens to include null bytes.
10676 Examples are Index nodes of Info files and null-byte delimited output
10677 from GNU Find and GNU Grep. Emacs will then ignore the null bytes and
10678 decode text as usual. */);
10679 inhibit_null_byte_detection = 0;
10680
10681 DEFVAR_LISP ("translation-table-for-input", Vtranslation_table_for_input,
10682 doc: /* Char table for translating self-inserting characters.
10683 This is applied to the result of input methods, not their input.
10684 See also `keyboard-translate-table'.
10685
10686 Use of this variable for character code unification was rendered
10687 obsolete in Emacs 23.1 and later, since Unicode is now the basis of
10688 internal character representation. */);
10689 Vtranslation_table_for_input = Qnil;
10690
10691 {
10692 Lisp_Object args[coding_arg_max];
10693 Lisp_Object plist[16];
10694 int i;
10695
10696 for (i = 0; i < coding_arg_max; i++)
10697 args[i] = Qnil;
10698
10699 plist[0] = intern_c_string (":name");
10700 plist[1] = args[coding_arg_name] = Qno_conversion;
10701 plist[2] = intern_c_string (":mnemonic");
10702 plist[3] = args[coding_arg_mnemonic] = make_number ('=');
10703 plist[4] = intern_c_string (":coding-type");
10704 plist[5] = args[coding_arg_coding_type] = Qraw_text;
10705 plist[6] = intern_c_string (":ascii-compatible-p");
10706 plist[7] = args[coding_arg_ascii_compatible_p] = Qt;
10707 plist[8] = intern_c_string (":default-char");
10708 plist[9] = args[coding_arg_default_char] = make_number (0);
10709 plist[10] = intern_c_string (":for-unibyte");
10710 plist[11] = args[coding_arg_for_unibyte] = Qt;
10711 plist[12] = intern_c_string (":docstring");
10712 plist[13] = make_pure_c_string ("Do no conversion.\n\
10713 \n\
10714 When you visit a file with this coding, the file is read into a\n\
10715 unibyte buffer as is, thus each byte of a file is treated as a\n\
10716 character.");
10717 plist[14] = intern_c_string (":eol-type");
10718 plist[15] = args[coding_arg_eol_type] = Qunix;
10719 args[coding_arg_plist] = Flist (16, plist);
10720 Fdefine_coding_system_internal (coding_arg_max, args);
10721
10722 plist[1] = args[coding_arg_name] = Qundecided;
10723 plist[3] = args[coding_arg_mnemonic] = make_number ('-');
10724 plist[5] = args[coding_arg_coding_type] = Qundecided;
10725 /* This is already set.
10726 plist[7] = args[coding_arg_ascii_compatible_p] = Qt; */
10727 plist[8] = intern_c_string (":charset-list");
10728 plist[9] = args[coding_arg_charset_list] = Fcons (Qascii, Qnil);
10729 plist[11] = args[coding_arg_for_unibyte] = Qnil;
10730 plist[13] = make_pure_c_string ("No conversion on encoding, automatic conversion on decoding.");
10731 plist[15] = args[coding_arg_eol_type] = Qnil;
10732 args[coding_arg_plist] = Flist (16, plist);
10733 Fdefine_coding_system_internal (coding_arg_max, args);
10734 }
10735
10736 setup_coding_system (Qno_conversion, &safe_terminal_coding);
10737
10738 {
10739 int i;
10740
10741 for (i = 0; i < coding_category_max; i++)
10742 Fset (AREF (Vcoding_category_table, i), Qno_conversion);
10743 }
10744 #if defined (DOS_NT)
10745 system_eol_type = Qdos;
10746 #else
10747 system_eol_type = Qunix;
10748 #endif
10749 staticpro (&system_eol_type);
10750 }
10751
10752 char *
10753 emacs_strerror (int error_number)
10754 {
10755 char *str;
10756
10757 synchronize_system_messages_locale ();
10758 str = strerror (error_number);
10759
10760 if (! NILP (Vlocale_coding_system))
10761 {
10762 Lisp_Object dec = code_convert_string_norecord (build_string (str),
10763 Vlocale_coding_system,
10764 0);
10765 str = SSDATA (dec);
10766 }
10767
10768 return str;
10769 }
10770
10771 #endif /* emacs */
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