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[emacs.git] / src / character.h
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1 /* Header for multibyte character handler.
2 Copyright (C) 1995, 1997, 1998 Electrotechnical Laboratory, JAPAN.
3 Licensed to the Free Software Foundation.
4 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
5 National Institute of Advanced Industrial Science and Technology (AIST)
6 Registration Number H13PRO009
7
8 This file is part of GNU Emacs.
9
10 GNU Emacs is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3, or (at your option)
13 any later version.
14
15 GNU Emacs is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with GNU Emacs; see the file COPYING. If not, write to the
22 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
24
25 #ifndef EMACS_CHARACTER_H
26 #define EMACS_CHARACTER_H
27
28 /* character code 1st byte byte sequence
29 -------------- -------- -------------
30 0-7F 00..7F 0xxxxxxx
31 80-7FF C2..DF 110xxxxx 10xxxxxx
32 800-FFFF E0..EF 1110xxxx 10xxxxxx 10xxxxxx
33 10000-1FFFFF F0..F7 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
34 200000-3FFF7F F8 11111000 1000xxxx 10xxxxxx 10xxxxxx 10xxxxxx
35 3FFF80-3FFFFF C0..C1 1100000x 10xxxxxx (for eight-bit-char)
36 400000-... invalid
37
38 invalid 1st byte 80..BF 10xxxxxx
39 F9..FF 11111xxx (xxx != 000)
40 */
41
42 /* Maximum character code ((1 << CHARACTERBITS) - 1). */
43 #define MAX_CHAR 0x3FFFFF
44
45 /* Maximum Unicode character code. */
46 #define MAX_UNICODE_CHAR 0x10FFFF
47
48 /* Maximum N-byte character codes. */
49 #define MAX_1_BYTE_CHAR 0x7F
50 #define MAX_2_BYTE_CHAR 0x7FF
51 #define MAX_3_BYTE_CHAR 0xFFFF
52 #define MAX_4_BYTE_CHAR 0x1FFFFF
53 #define MAX_5_BYTE_CHAR 0x3FFF7F
54
55 /* Minimum leading code of multibyte characters. */
56 #define MIN_MULTIBYTE_LEADING_CODE 0xC0
57 /* Maximum leading code of multibyte characters. */
58 #define MAX_MULTIBYTE_LEADING_CODE 0xF8
59
60 /* Nonzero iff C is a character that corresponds to a raw 8-bit
61 byte. */
62 #define CHAR_BYTE8_P(c) ((c) > MAX_5_BYTE_CHAR)
63
64 /* Return the character code for raw 8-bit byte BYTE. */
65 #define BYTE8_TO_CHAR(byte) ((byte) + 0x3FFF00)
66
67 /* Return the raw 8-bit byte for character C. */
68 #define CHAR_TO_BYTE8(c) \
69 (CHAR_BYTE8_P (c) \
70 ? (c) - 0x3FFF00 \
71 : multibyte_char_to_unibyte (c, Qnil))
72
73 /* Nonzero iff BYTE is the 1st byte of a multibyte form of a character
74 that corresponds to a raw 8-bit byte. */
75 #define CHAR_BYTE8_HEAD_P(byte) ((byte) == 0xC0 || (byte) == 0xC1)
76
77 /* Mapping table from unibyte chars to multibyte chars. */
78 extern int unibyte_to_multibyte_table[256];
79
80 /* Convert the unibyte character C to the corresponding multibyte
81 character. If C can't be converted, return C. */
82 #define unibyte_char_to_multibyte(c) \
83 ((c) < 256 ? unibyte_to_multibyte_table[(c)] : (c))
84
85 /* Nth element is 1 iff unibyte char N can be mapped to a multibyte
86 char. */
87 extern char unibyte_has_multibyte_table[256];
88
89 #define UNIBYTE_CHAR_HAS_MULTIBYTE_P(c) (unibyte_has_multibyte_table[(c)])
90
91 /* If C is not ASCII, make it unibyte. */
92 #define MAKE_CHAR_UNIBYTE(c) \
93 do { \
94 if (! ASCII_CHAR_P (c)) \
95 c = CHAR_TO_BYTE8 (c); \
96 } while (0)
97
98
99 /* If C is not ASCII, make it multibyte. It assumes C < 256. */
100 #define MAKE_CHAR_MULTIBYTE(c) ((c) = unibyte_to_multibyte_table[(c)])
101
102 /* This is the maximum byte length of multibyte form. */
103 #define MAX_MULTIBYTE_LENGTH 5
104
105 /* Return a Lisp character whose character code is C. It assumes C is
106 a valid character code. */
107 #define make_char(c) make_number (c)
108
109 /* Nonzero iff C is an ASCII byte. */
110 #define ASCII_BYTE_P(c) ((unsigned) (c) < 0x80)
111
112 /* Nonzero iff X is a character. */
113 #define CHARACTERP(x) (NATNUMP (x) && XFASTINT (x) <= MAX_CHAR)
114
115 /* Nonzero iff C is valid as a character code. GENERICP is not used
116 now. */
117 #define CHAR_VALID_P(c, genericp) ((unsigned) (c) <= MAX_CHAR)
118
119 /* Check if Lisp object X is a character or not. */
120 #define CHECK_CHARACTER(x) \
121 CHECK_TYPE (CHARACTERP (x), Qcharacterp, x)
122
123 #define CHECK_CHARACTER_CAR(x) \
124 do { \
125 Lisp_Object tmp = XCAR (x); \
126 CHECK_CHARACTER (tmp); \
127 XSETCAR ((x), tmp); \
128 } while (0)
129
130 #define CHECK_CHARACTER_CDR(x) \
131 do { \
132 Lisp_Object tmp = XCDR (x); \
133 CHECK_CHARACTER (tmp); \
134 XSETCDR ((x), tmp); \
135 } while (0)
136
137 /* Nonzero iff C is an ASCII character. */
138 #define ASCII_CHAR_P(c) ((unsigned) (c) < 0x80)
139
140 /* Nonzero iff C is a character of code less than 0x100. */
141 #define SINGLE_BYTE_CHAR_P(c) ((unsigned) (c) < 0x100)
142
143 /* Nonzero if character C has a printable glyph. */
144 #define CHAR_PRINTABLE_P(c) \
145 (((c) >= 32 && ((c) < 127) \
146 || ! NILP (CHAR_TABLE_REF (Vprintable_chars, (c)))))
147
148 /* Return byte length of multibyte form for character C. */
149 #define CHAR_BYTES(c) \
150 ( (c) <= MAX_1_BYTE_CHAR ? 1 \
151 : (c) <= MAX_2_BYTE_CHAR ? 2 \
152 : (c) <= MAX_3_BYTE_CHAR ? 3 \
153 : (c) <= MAX_4_BYTE_CHAR ? 4 \
154 : (c) <= MAX_5_BYTE_CHAR ? 5 \
155 : 2)
156
157
158 /* Return the leading code of multibyte form of C. */
159 #define CHAR_LEADING_CODE(c) \
160 ((c) <= MAX_1_BYTE_CHAR ? c \
161 : (c) <= MAX_2_BYTE_CHAR ? (0xC0 | ((c) >> 6)) \
162 : (c) <= MAX_3_BYTE_CHAR ? (0xE0 | ((c) >> 12)) \
163 : (c) <= MAX_4_BYTE_CHAR ? (0xF0 | ((c) >> 18)) \
164 : (c) <= MAX_5_BYTE_CHAR ? 0xF8 \
165 : (0xC0 | (((c) >> 6) & 0x01)))
166
167
168 /* Store multibyte form of the character C in P. The caller should
169 allocate at least MAX_MULTIBYTE_LENGTH bytes area at P in advance.
170 Returns the length of the multibyte form. */
171
172 #define CHAR_STRING(c, p) \
173 ((unsigned) (c) <= MAX_1_BYTE_CHAR \
174 ? ((p)[0] = (c), \
175 1) \
176 : (unsigned) (c) <= MAX_2_BYTE_CHAR \
177 ? ((p)[0] = (0xC0 | ((c) >> 6)), \
178 (p)[1] = (0x80 | ((c) & 0x3F)), \
179 2) \
180 : (unsigned) (c) <= MAX_3_BYTE_CHAR \
181 ? ((p)[0] = (0xE0 | ((c) >> 12)), \
182 (p)[1] = (0x80 | (((c) >> 6) & 0x3F)), \
183 (p)[2] = (0x80 | ((c) & 0x3F)), \
184 3) \
185 : char_string ((unsigned) c, p))
186
187 /* Store multibyte form of byte B in P. The caller should allocate at
188 least MAX_MULTIBYTE_LENGTH bytes area at P in advance. Returns the
189 length of the multibyte form. */
190
191 #define BYTE8_STRING(b, p) \
192 ((p)[0] = (0xC0 | (((b) >> 6) & 0x01)), \
193 (p)[1] = (0x80 | ((b) & 0x3F)), \
194 2)
195
196
197 /* Store multibyte form of the character C in P. The caller should
198 allocate at least MAX_MULTIBYTE_LENGTH bytes area at P in advance.
199 And, advance P to the end of the multibyte form. */
200
201 #define CHAR_STRING_ADVANCE(c, p) \
202 do { \
203 if ((c) <= MAX_1_BYTE_CHAR) \
204 *(p)++ = (c); \
205 else if ((c) <= MAX_2_BYTE_CHAR) \
206 *(p)++ = (0xC0 | ((c) >> 6)), \
207 *(p)++ = (0x80 | ((c) & 0x3F)); \
208 else if ((c) <= MAX_3_BYTE_CHAR) \
209 *(p)++ = (0xE0 | ((c) >> 12)), \
210 *(p)++ = (0x80 | (((c) >> 6) & 0x3F)), \
211 *(p)++ = (0x80 | ((c) & 0x3F)); \
212 else \
213 (p) += char_string ((c), (p)); \
214 } while (0)
215
216
217 /* Nonzero iff BYTE starts a non-ASCII character in a multibyte
218 form. */
219 #define LEADING_CODE_P(byte) (((byte) & 0xC0) == 0xC0)
220
221 /* Nonzero iff BYTE is a trailing code of a non-ASCII character in a
222 multibyte form. */
223 #define TRAILING_CODE_P(byte) (((byte) & 0xC0) == 0x80)
224
225 /* Nonzero iff BYTE starts a character in a multibyte form.
226 This is equivalent to:
227 (ASCII_BYTE_P (byte) || LEADING_CODE_P (byte)) */
228 #define CHAR_HEAD_P(byte) (((byte) & 0xC0) != 0x80)
229
230 /* Just kept for backward compatibility. This macro will be removed
231 in the future. */
232 #define BASE_LEADING_CODE_P LEADING_CODE_P
233
234 /* How many bytes a character that starts with BYTE occupies in a
235 multibyte form. */
236 #define BYTES_BY_CHAR_HEAD(byte) \
237 (!((byte) & 0x80) ? 1 \
238 : !((byte) & 0x20) ? 2 \
239 : !((byte) & 0x10) ? 3 \
240 : !((byte) & 0x08) ? 4 \
241 : 5)
242
243
244 /* Return the length of the multi-byte form at string STR of length
245 LEN while assuming that STR points a valid multi-byte form. As
246 this macro isn't necessary anymore, all callers will be changed to
247 use BYTES_BY_CHAR_HEAD directly in the future. */
248
249 #define MULTIBYTE_FORM_LENGTH(str, len) \
250 BYTES_BY_CHAR_HEAD (*(str))
251
252 /* Parse multibyte string STR of length LENGTH and set BYTES to the
253 byte length of a character at STR while assuming that STR points a
254 valid multibyte form. As this macro isn't necessary anymore, all
255 callers will be changed to use BYTES_BY_CHAR_HEAD directly in the
256 future. */
257
258 #define PARSE_MULTIBYTE_SEQ(str, length, bytes) \
259 (bytes) = BYTES_BY_CHAR_HEAD (*(str))
260
261 /* The byte length of multibyte form at unibyte string P ending at
262 PEND. If STR doesn't point a valid multibyte form, return 0. */
263
264 #define MULTIBYTE_LENGTH(p, pend) \
265 (p >= pend ? 0 \
266 : !((p)[0] & 0x80) ? 1 \
267 : ((p + 1 >= pend) || (((p)[1] & 0xC0) != 0x80)) ? 0 \
268 : ((p)[0] & 0xE0) == 0xC0 ? 2 \
269 : ((p + 2 >= pend) || (((p)[2] & 0xC0) != 0x80)) ? 0 \
270 : ((p)[0] & 0xF0) == 0xE0 ? 3 \
271 : ((p + 3 >= pend) || (((p)[3] & 0xC0) != 0x80)) ? 0 \
272 : ((p)[0] & 0xF8) == 0xF0 ? 4 \
273 : ((p + 4 >= pend) || (((p)[4] & 0xC0) != 0x80)) ? 0 \
274 : (p)[0] == 0xF8 && ((p)[1] & 0xF0) == 0x80 ? 5 \
275 : 0)
276
277
278 /* Like MULTIBYTE_LENGTH but don't check the ending address. */
279
280 #define MULTIBYTE_LENGTH_NO_CHECK(p) \
281 (!((p)[0] & 0x80) ? 1 \
282 : ((p)[1] & 0xC0) != 0x80 ? 0 \
283 : ((p)[0] & 0xE0) == 0xC0 ? 2 \
284 : ((p)[2] & 0xC0) != 0x80 ? 0 \
285 : ((p)[0] & 0xF0) == 0xE0 ? 3 \
286 : ((p)[3] & 0xC0) != 0x80 ? 0 \
287 : ((p)[0] & 0xF8) == 0xF0 ? 4 \
288 : ((p)[4] & 0xC0) != 0x80 ? 0 \
289 : (p)[0] == 0xF8 && ((p)[1] & 0xF0) == 0x80 ? 5 \
290 : 0)
291
292 /* If P is before LIMIT, advance P to the next character boundary. It
293 assumes that P is already at a character boundary of the sane
294 mulitbyte form whose end address is LIMIT. */
295
296 #define NEXT_CHAR_BOUNDARY(p, limit) \
297 do { \
298 if ((p) < (limit)) \
299 (p) += BYTES_BY_CHAR_HEAD (*(p)); \
300 } while (0)
301
302
303 /* If P is after LIMIT, advance P to the previous character boundary.
304 It assumes that P is already at a character boundary of the sane
305 mulitbyte form whose beginning address is LIMIT. */
306
307 #define PREV_CHAR_BOUNDARY(p, limit) \
308 do { \
309 if ((p) > (limit)) \
310 { \
311 const unsigned char *p0 = (p); \
312 do { \
313 p0--; \
314 } while (p0 >= limit && ! CHAR_HEAD_P (*p0)); \
315 (p) = (BYTES_BY_CHAR_HEAD (*p0) == (p) - p0) ? p0 : (p) - 1; \
316 } \
317 } while (0)
318
319 /* Return the character code of character whose multibyte form is at
320 P. The argument LEN is ignored. It will be removed in the
321 future. */
322
323 #define STRING_CHAR(p, len) \
324 (!((p)[0] & 0x80) \
325 ? (p)[0] \
326 : ! ((p)[0] & 0x20) \
327 ? (((((p)[0] & 0x1F) << 6) \
328 | ((p)[1] & 0x3F)) \
329 + (((unsigned char) (p)[0]) < 0xC2 ? 0x3FFF80 : 0)) \
330 : ! ((p)[0] & 0x10) \
331 ? ((((p)[0] & 0x0F) << 12) \
332 | (((p)[1] & 0x3F) << 6) \
333 | ((p)[2] & 0x3F)) \
334 : string_char ((p), NULL, NULL))
335
336
337 /* Like STRING_CHAR but set ACTUAL_LEN to the length of multibyte
338 form. The argument LEN is ignored. It will be removed in the
339 future. */
340
341 #define STRING_CHAR_AND_LENGTH(p, len, actual_len) \
342 (!((p)[0] & 0x80) \
343 ? ((actual_len) = 1, (p)[0]) \
344 : ! ((p)[0] & 0x20) \
345 ? ((actual_len) = 2, \
346 (((((p)[0] & 0x1F) << 6) \
347 | ((p)[1] & 0x3F)) \
348 + (((unsigned char) (p)[0]) < 0xC2 ? 0x3FFF80 : 0))) \
349 : ! ((p)[0] & 0x10) \
350 ? ((actual_len) = 3, \
351 ((((p)[0] & 0x0F) << 12) \
352 | (((p)[1] & 0x3F) << 6) \
353 | ((p)[2] & 0x3F))) \
354 : string_char ((p), NULL, &actual_len))
355
356
357 /* Like STRING_CHAR but advance P to the end of multibyte form. */
358
359 #define STRING_CHAR_ADVANCE(p) \
360 (!((p)[0] & 0x80) \
361 ? *(p)++ \
362 : ! ((p)[0] & 0x20) \
363 ? ((p) += 2, \
364 ((((p)[-2] & 0x1F) << 6) \
365 | ((p)[-1] & 0x3F) \
366 | ((unsigned char) ((p)[-2]) < 0xC2 ? 0x3FFF80 : 0))) \
367 : ! ((p)[0] & 0x10) \
368 ? ((p) += 3, \
369 ((((p)[-3] & 0x0F) << 12) \
370 | (((p)[-2] & 0x3F) << 6) \
371 | ((p)[-1] & 0x3F))) \
372 : string_char ((p), &(p), NULL))
373
374
375 /* Fetch the "next" character from Lisp string STRING at byte position
376 BYTEIDX, character position CHARIDX. Store it into OUTPUT.
377
378 All the args must be side-effect-free.
379 BYTEIDX and CHARIDX must be lvalues;
380 we increment them past the character fetched. */
381
382 #define FETCH_STRING_CHAR_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX) \
383 do \
384 { \
385 CHARIDX++; \
386 if (STRING_MULTIBYTE (STRING)) \
387 { \
388 unsigned char *ptr = &SDATA (STRING)[BYTEIDX]; \
389 int len; \
390 \
391 OUTPUT = STRING_CHAR_AND_LENGTH (ptr, 0, len); \
392 BYTEIDX += len; \
393 } \
394 else \
395 { \
396 OUTPUT = SREF (STRING, BYTEIDX); \
397 BYTEIDX++; \
398 } \
399 } \
400 while (0)
401
402 /* Like FETCH_STRING_CHAR_ADVANCE but return a multibyte character eve
403 if STRING is unibyte. */
404
405 #define FETCH_STRING_CHAR_AS_MULTIBYTE_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX) \
406 do \
407 { \
408 CHARIDX++; \
409 if (STRING_MULTIBYTE (STRING)) \
410 { \
411 unsigned char *ptr = &SDATA (STRING)[BYTEIDX]; \
412 int len; \
413 \
414 OUTPUT = STRING_CHAR_AND_LENGTH (ptr, 0, len); \
415 BYTEIDX += len; \
416 } \
417 else \
418 { \
419 OUTPUT = SREF (STRING, BYTEIDX); \
420 BYTEIDX++; \
421 MAKE_CHAR_MULTIBYTE (OUTPUT); \
422 } \
423 } \
424 while (0)
425
426
427 /* Like FETCH_STRING_CHAR_ADVANCE but assumes STRING is multibyte. */
428
429 #define FETCH_STRING_CHAR_ADVANCE_NO_CHECK(OUTPUT, STRING, CHARIDX, BYTEIDX) \
430 do \
431 { \
432 unsigned char *ptr = &SDATA (STRING)[BYTEIDX]; \
433 int len; \
434 \
435 OUTPUT = STRING_CHAR_AND_LENGTH (ptr, 0, len); \
436 BYTEIDX += len; \
437 CHARIDX++; \
438 } \
439 while (0)
440
441
442 /* Like FETCH_STRING_CHAR_ADVANCE but fetch character from the current
443 buffer. */
444
445 #define FETCH_CHAR_ADVANCE(OUTPUT, CHARIDX, BYTEIDX) \
446 do \
447 { \
448 CHARIDX++; \
449 if (!NILP (current_buffer->enable_multibyte_characters)) \
450 { \
451 unsigned char *ptr = BYTE_POS_ADDR (BYTEIDX); \
452 int len; \
453 \
454 OUTPUT= STRING_CHAR_AND_LENGTH (ptr, 0, len); \
455 BYTEIDX += len; \
456 } \
457 else \
458 { \
459 OUTPUT = *(BYTE_POS_ADDR (BYTEIDX)); \
460 BYTEIDX++; \
461 } \
462 } \
463 while (0)
464
465
466 /* Like FETCH_CHAR_ADVANCE but assumes the current buffer is multibyte. */
467
468 #define FETCH_CHAR_ADVANCE_NO_CHECK(OUTPUT, CHARIDX, BYTEIDX) \
469 do \
470 { \
471 unsigned char *ptr = BYTE_POS_ADDR (BYTEIDX); \
472 int len; \
473 \
474 OUTPUT= STRING_CHAR_AND_LENGTH (ptr, 0, len); \
475 BYTEIDX += len; \
476 CHARIDX++; \
477 } \
478 while (0)
479
480
481 /* Increase the buffer byte position POS_BYTE of the current buffer to
482 the next character boundary. No range checking of POS. */
483
484 #define INC_POS(pos_byte) \
485 do { \
486 unsigned char *p = BYTE_POS_ADDR (pos_byte); \
487 pos_byte += BYTES_BY_CHAR_HEAD (*p); \
488 } while (0)
489
490
491 /* Decrease the buffer byte position POS_BYTE of the current buffer to
492 the previous character boundary. No range checking of POS. */
493
494 #define DEC_POS(pos_byte) \
495 do { \
496 unsigned char *p; \
497 \
498 pos_byte--; \
499 if (pos_byte < GPT_BYTE) \
500 p = BEG_ADDR + pos_byte - BEG_BYTE; \
501 else \
502 p = BEG_ADDR + GAP_SIZE + pos_byte - BEG_BYTE;\
503 while (!CHAR_HEAD_P (*p)) \
504 { \
505 p--; \
506 pos_byte--; \
507 } \
508 } while (0)
509
510 /* Increment both CHARPOS and BYTEPOS, each in the appropriate way. */
511
512 #define INC_BOTH(charpos, bytepos) \
513 do \
514 { \
515 (charpos)++; \
516 if (NILP (current_buffer->enable_multibyte_characters)) \
517 (bytepos)++; \
518 else \
519 INC_POS ((bytepos)); \
520 } \
521 while (0)
522
523
524 /* Decrement both CHARPOS and BYTEPOS, each in the appropriate way. */
525
526 #define DEC_BOTH(charpos, bytepos) \
527 do \
528 { \
529 (charpos)--; \
530 if (NILP (current_buffer->enable_multibyte_characters)) \
531 (bytepos)--; \
532 else \
533 DEC_POS ((bytepos)); \
534 } \
535 while (0)
536
537
538 /* Increase the buffer byte position POS_BYTE of the current buffer to
539 the next character boundary. This macro relies on the fact that
540 *GPT_ADDR and *Z_ADDR are always accessible and the values are
541 '\0'. No range checking of POS_BYTE. */
542
543 #define BUF_INC_POS(buf, pos_byte) \
544 do { \
545 unsigned char *p = BUF_BYTE_ADDRESS (buf, pos_byte); \
546 pos_byte += BYTES_BY_CHAR_HEAD (*p); \
547 } while (0)
548
549
550 /* Decrease the buffer byte position POS_BYTE of the current buffer to
551 the previous character boundary. No range checking of POS_BYTE. */
552
553 #define BUF_DEC_POS(buf, pos_byte) \
554 do { \
555 unsigned char *p; \
556 pos_byte--; \
557 if (pos_byte < BUF_GPT_BYTE (buf)) \
558 p = BUF_BEG_ADDR (buf) + pos_byte - BEG_BYTE; \
559 else \
560 p = BUF_BEG_ADDR (buf) + BUF_GAP_SIZE (buf) + pos_byte - BEG_BYTE;\
561 while (!CHAR_HEAD_P (*p)) \
562 { \
563 p--; \
564 pos_byte--; \
565 } \
566 } while (0)
567
568
569 /* If C is a character to be unified with a Unicode character, return
570 the unified Unicode character. */
571
572 #define MAYBE_UNIFY_CHAR(c) \
573 if (c > MAX_UNICODE_CHAR \
574 && CHAR_TABLE_P (Vchar_unify_table)) \
575 { \
576 Lisp_Object val; \
577 int unified; \
578 \
579 val = CHAR_TABLE_REF (Vchar_unify_table, c); \
580 if (! NILP (val)) \
581 { \
582 if (SYMBOLP (val)) \
583 { \
584 Funify_charset (val, Qnil, Qnil); \
585 val = CHAR_TABLE_REF (Vchar_unify_table, c); \
586 } \
587 if ((unified = XINT (val)) >= 0) \
588 c = unified; \
589 } \
590 } \
591 else
592
593
594 /* Return the width of ASCII character C. The width is measured by
595 how many columns occupied on the screen when displayed in the
596 current buffer. */
597
598 #define ASCII_CHAR_WIDTH(c) \
599 (c < 0x20 \
600 ? (c == '\t' \
601 ? XFASTINT (current_buffer->tab_width) \
602 : (c == '\n' ? 0 : (NILP (current_buffer->ctl_arrow) ? 4 : 2))) \
603 : (c < 0x7f \
604 ? 1 \
605 : ((NILP (current_buffer->ctl_arrow) ? 4 : 2))))
606
607 /* Return the width of character C. The width is measured by how many
608 columns occupied on the screen when displayed in the current
609 buffer. */
610
611 #define CHAR_WIDTH(c) \
612 (ASCII_CHAR_P (c) \
613 ? ASCII_CHAR_WIDTH (c) \
614 : XINT (CHAR_TABLE_REF (Vchar_width_table, c)))
615
616 extern int char_resolve_modifier_mask P_ ((int));
617 extern int char_string P_ ((unsigned, unsigned char *));
618 extern int string_char P_ ((const unsigned char *,
619 const unsigned char **, int *));
620
621 extern int translate_char P_ ((Lisp_Object, int c));
622 extern int char_printable_p P_ ((int c));
623 extern void parse_str_as_multibyte P_ ((const unsigned char *, int, int *,
624 int *));
625 extern int parse_str_to_multibyte P_ ((unsigned char *, int));
626 extern int str_as_multibyte P_ ((unsigned char *, int, int, int *));
627 extern int str_to_multibyte P_ ((unsigned char *, int, int));
628 extern int str_as_unibyte P_ ((unsigned char *, int));
629 extern int strwidth P_ ((unsigned char *, int));
630 extern int c_string_width P_ ((const unsigned char *, int, int, int *, int *));
631 extern int lisp_string_width P_ ((Lisp_Object, int, int *, int *));
632
633 extern Lisp_Object Vprintable_chars;
634
635 extern Lisp_Object Qcharacterp, Qauto_fill_chars;
636 extern Lisp_Object Vtranslation_table_vector;
637 extern Lisp_Object Vchar_width_table;
638 extern Lisp_Object Vchar_direction_table;
639 extern Lisp_Object Vchar_unify_table;
640
641 extern Lisp_Object string_escape_byte8 P_ ((Lisp_Object));
642
643 /* Return a translation table of id number ID. */
644 #define GET_TRANSLATION_TABLE(id) \
645 (XCDR(XVECTOR(Vtranslation_table_vector)->contents[(id)]))
646
647 /* A char-table for characters which may invoke auto-filling. */
648 extern Lisp_Object Vauto_fill_chars;
649
650 extern Lisp_Object Vchar_script_table;
651 extern Lisp_Object Vscript_representative_chars;
652
653 /* Copy LEN bytes from FROM to TO. This macro should be used only
654 when a caller knows that LEN is short and the obvious copy loop is
655 faster than calling bcopy which has some overhead. Copying a
656 multibyte sequence of a character is the typical case. */
657
658 #define BCOPY_SHORT(from, to, len) \
659 do { \
660 int i = len; \
661 unsigned char *from_p = from, *to_p = to; \
662 while (i--) *to_p++ = *from_p++; \
663 } while (0)
664
665 #define DEFSYM(sym, name) \
666 do { (sym) = intern ((name)); staticpro (&(sym)); } while (0)
667
668 #endif /* EMACS_CHARACTER_H */
669
670 /* arch-tag: 4ef86004-2eff-4073-8cea-cfcbcf7188ac
671 (do not change this comment) */
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