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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, 2009, 2010, 2011
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 of the License, or
13 (at your option) 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. If not, see <http://www.gnu.org/licenses/>. */
22
23 #ifndef EMACS_CHARACTER_H
24 #define EMACS_CHARACTER_H
25
26 #include <verify.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 #define UNIBYTE_TO_CHAR(byte) \
68 (ASCII_BYTE_P (byte) ? (byte) : BYTE8_TO_CHAR (byte))
69
70 /* Return the raw 8-bit byte for character C. */
71 #define CHAR_TO_BYTE8(c) \
72 (CHAR_BYTE8_P (c) \
73 ? (c) - 0x3FFF00 \
74 : multibyte_char_to_unibyte (c))
75
76 /* Return the raw 8-bit byte for character C,
77 or -1 if C doesn't correspond to a byte. */
78 #define CHAR_TO_BYTE_SAFE(c) \
79 (CHAR_BYTE8_P (c) \
80 ? (c) - 0x3FFF00 \
81 : multibyte_char_to_unibyte_safe (c))
82
83 /* Nonzero iff BYTE is the 1st byte of a multibyte form of a character
84 that corresponds to a raw 8-bit byte. */
85 #define CHAR_BYTE8_HEAD_P(byte) ((byte) == 0xC0 || (byte) == 0xC1)
86
87 /* If C is not ASCII, make it unibyte. */
88 #define MAKE_CHAR_UNIBYTE(c) \
89 do { \
90 if (! ASCII_CHAR_P (c)) \
91 c = CHAR_TO_BYTE8 (c); \
92 } while (0)
93
94
95 /* If C is not ASCII, make it multibyte. Assumes C < 256. */
96 #define MAKE_CHAR_MULTIBYTE(c) \
97 (eassert ((c) >= 0 && (c) < 256), (c) = UNIBYTE_TO_CHAR (c))
98
99 /* This is the maximum byte length of multibyte form. */
100 #define MAX_MULTIBYTE_LENGTH 5
101
102 /* Return a Lisp character whose character code is C. Assumes C is
103 a valid character code. */
104 #define make_char(c) make_number (c)
105
106 /* Nonzero iff C is an ASCII byte. */
107 #define ASCII_BYTE_P(c) UNSIGNED_CMP (c, <, 0x80)
108
109 /* Nonzero iff X is a character. */
110 #define CHARACTERP(x) (NATNUMP (x) && XFASTINT (x) <= MAX_CHAR)
111
112 /* Nonzero iff C is valid as a character code. */
113 #define CHAR_VALID_P(c) UNSIGNED_CMP (c, <=, MAX_CHAR)
114
115 /* Check if Lisp object X is a character or not. */
116 #define CHECK_CHARACTER(x) \
117 CHECK_TYPE (CHARACTERP (x), Qcharacterp, x)
118
119 #define CHECK_CHARACTER_CAR(x) \
120 do { \
121 Lisp_Object tmp = XCAR (x); \
122 CHECK_CHARACTER (tmp); \
123 XSETCAR ((x), tmp); \
124 } while (0)
125
126 #define CHECK_CHARACTER_CDR(x) \
127 do { \
128 Lisp_Object tmp = XCDR (x); \
129 CHECK_CHARACTER (tmp); \
130 XSETCDR ((x), tmp); \
131 } while (0)
132
133 /* Nonzero iff C is a character of code less than 0x100. */
134 #define SINGLE_BYTE_CHAR_P(c) UNSIGNED_CMP (c, <, 0x100)
135
136 /* Nonzero if character C has a printable glyph. */
137 #define CHAR_PRINTABLE_P(c) \
138 (((c) >= 32 && (c) < 127) \
139 || ! NILP (CHAR_TABLE_REF (Vprintable_chars, (c))))
140
141 /* Return byte length of multibyte form for character C. */
142 #define CHAR_BYTES(c) \
143 ( (c) <= MAX_1_BYTE_CHAR ? 1 \
144 : (c) <= MAX_2_BYTE_CHAR ? 2 \
145 : (c) <= MAX_3_BYTE_CHAR ? 3 \
146 : (c) <= MAX_4_BYTE_CHAR ? 4 \
147 : (c) <= MAX_5_BYTE_CHAR ? 5 \
148 : 2)
149
150
151 /* Return the leading code of multibyte form of C. */
152 #define CHAR_LEADING_CODE(c) \
153 ((c) <= MAX_1_BYTE_CHAR ? c \
154 : (c) <= MAX_2_BYTE_CHAR ? (0xC0 | ((c) >> 6)) \
155 : (c) <= MAX_3_BYTE_CHAR ? (0xE0 | ((c) >> 12)) \
156 : (c) <= MAX_4_BYTE_CHAR ? (0xF0 | ((c) >> 18)) \
157 : (c) <= MAX_5_BYTE_CHAR ? 0xF8 \
158 : (0xC0 | (((c) >> 6) & 0x01)))
159
160
161 /* Store multibyte form of the character C in P. The caller should
162 allocate at least MAX_MULTIBYTE_LENGTH bytes area at P in advance.
163 Returns the length of the multibyte form. */
164
165 #define CHAR_STRING(c, p) \
166 (UNSIGNED_CMP (c, <=, MAX_1_BYTE_CHAR) \
167 ? ((p)[0] = (c), \
168 1) \
169 : UNSIGNED_CMP (c, <=, MAX_2_BYTE_CHAR) \
170 ? ((p)[0] = (0xC0 | ((c) >> 6)), \
171 (p)[1] = (0x80 | ((c) & 0x3F)), \
172 2) \
173 : UNSIGNED_CMP (c, <=, MAX_3_BYTE_CHAR) \
174 ? ((p)[0] = (0xE0 | ((c) >> 12)), \
175 (p)[1] = (0x80 | (((c) >> 6) & 0x3F)), \
176 (p)[2] = (0x80 | ((c) & 0x3F)), \
177 3) \
178 : verify_expr (sizeof (c) <= sizeof (unsigned), char_string (c, p)))
179
180 /* Store multibyte form of byte B in P. The caller should allocate at
181 least MAX_MULTIBYTE_LENGTH bytes area at P in advance. Returns the
182 length of the multibyte form. */
183
184 #define BYTE8_STRING(b, p) \
185 ((p)[0] = (0xC0 | (((b) >> 6) & 0x01)), \
186 (p)[1] = (0x80 | ((b) & 0x3F)), \
187 2)
188
189
190 /* Store multibyte form of the character C in P and advance P to the
191 end of the multibyte form. The caller should allocate at least
192 MAX_MULTIBYTE_LENGTH bytes area at P in advance. */
193
194 #define CHAR_STRING_ADVANCE(c, p) \
195 do { \
196 if ((c) <= MAX_1_BYTE_CHAR) \
197 *(p)++ = (c); \
198 else if ((c) <= MAX_2_BYTE_CHAR) \
199 *(p)++ = (0xC0 | ((c) >> 6)), \
200 *(p)++ = (0x80 | ((c) & 0x3F)); \
201 else if ((c) <= MAX_3_BYTE_CHAR) \
202 *(p)++ = (0xE0 | ((c) >> 12)), \
203 *(p)++ = (0x80 | (((c) >> 6) & 0x3F)), \
204 *(p)++ = (0x80 | ((c) & 0x3F)); \
205 else \
206 { \
207 verify (sizeof (c) <= sizeof (unsigned)); \
208 (p) += char_string (c, p); \
209 } \
210 } while (0)
211
212
213 /* Nonzero iff BYTE starts a non-ASCII character in a multibyte
214 form. */
215 #define LEADING_CODE_P(byte) (((byte) & 0xC0) == 0xC0)
216
217 /* Nonzero iff BYTE is a trailing code of a non-ASCII character in a
218 multibyte form. */
219 #define TRAILING_CODE_P(byte) (((byte) & 0xC0) == 0x80)
220
221 /* Nonzero iff BYTE starts a character in a multibyte form.
222 This is equivalent to:
223 (ASCII_BYTE_P (byte) || LEADING_CODE_P (byte)) */
224 #define CHAR_HEAD_P(byte) (((byte) & 0xC0) != 0x80)
225
226 /* How many bytes a character that starts with BYTE occupies in a
227 multibyte form. */
228 #define BYTES_BY_CHAR_HEAD(byte) \
229 (!((byte) & 0x80) ? 1 \
230 : !((byte) & 0x20) ? 2 \
231 : !((byte) & 0x10) ? 3 \
232 : !((byte) & 0x08) ? 4 \
233 : 5)
234
235
236 /* The byte length of multibyte form at unibyte string P ending at
237 PEND. If STR doesn't point to a valid multibyte form, return 0. */
238
239 #define MULTIBYTE_LENGTH(p, pend) \
240 (p >= pend ? 0 \
241 : !((p)[0] & 0x80) ? 1 \
242 : ((p + 1 >= pend) || (((p)[1] & 0xC0) != 0x80)) ? 0 \
243 : ((p)[0] & 0xE0) == 0xC0 ? 2 \
244 : ((p + 2 >= pend) || (((p)[2] & 0xC0) != 0x80)) ? 0 \
245 : ((p)[0] & 0xF0) == 0xE0 ? 3 \
246 : ((p + 3 >= pend) || (((p)[3] & 0xC0) != 0x80)) ? 0 \
247 : ((p)[0] & 0xF8) == 0xF0 ? 4 \
248 : ((p + 4 >= pend) || (((p)[4] & 0xC0) != 0x80)) ? 0 \
249 : (p)[0] == 0xF8 && ((p)[1] & 0xF0) == 0x80 ? 5 \
250 : 0)
251
252
253 /* Like MULTIBYTE_LENGTH, but don't check the ending address. */
254
255 #define MULTIBYTE_LENGTH_NO_CHECK(p) \
256 (!((p)[0] & 0x80) ? 1 \
257 : ((p)[1] & 0xC0) != 0x80 ? 0 \
258 : ((p)[0] & 0xE0) == 0xC0 ? 2 \
259 : ((p)[2] & 0xC0) != 0x80 ? 0 \
260 : ((p)[0] & 0xF0) == 0xE0 ? 3 \
261 : ((p)[3] & 0xC0) != 0x80 ? 0 \
262 : ((p)[0] & 0xF8) == 0xF0 ? 4 \
263 : ((p)[4] & 0xC0) != 0x80 ? 0 \
264 : (p)[0] == 0xF8 && ((p)[1] & 0xF0) == 0x80 ? 5 \
265 : 0)
266
267 /* If P is before LIMIT, advance P to the next character boundary.
268 Assumes that P is already at a character boundary of the same
269 multibyte form whose end address is LIMIT. */
270
271 #define NEXT_CHAR_BOUNDARY(p, limit) \
272 do { \
273 if ((p) < (limit)) \
274 (p) += BYTES_BY_CHAR_HEAD (*(p)); \
275 } while (0)
276
277
278 /* If P is after LIMIT, advance P to the previous character boundary.
279 Assumes that P is already at a character boundary of the same
280 multibyte form whose beginning address is LIMIT. */
281
282 #define PREV_CHAR_BOUNDARY(p, limit) \
283 do { \
284 if ((p) > (limit)) \
285 { \
286 const unsigned char *chp = (p); \
287 do { \
288 chp--; \
289 } while (chp >= limit && ! CHAR_HEAD_P (*chp)); \
290 (p) = (BYTES_BY_CHAR_HEAD (*chp) == (p) - chp) ? chp : (p) - 1; \
291 } \
292 } while (0)
293
294 /* Return the character code of character whose multibyte form is at
295 P. Note that this macro unifies CJK characters whose codepoints
296 are in the Private Use Areas (PUAs), so it might return a different
297 codepoint from the one actually stored at P. */
298
299 #define STRING_CHAR(p) \
300 (!((p)[0] & 0x80) \
301 ? (p)[0] \
302 : ! ((p)[0] & 0x20) \
303 ? (((((p)[0] & 0x1F) << 6) \
304 | ((p)[1] & 0x3F)) \
305 + (((unsigned char) (p)[0]) < 0xC2 ? 0x3FFF80 : 0)) \
306 : ! ((p)[0] & 0x10) \
307 ? ((((p)[0] & 0x0F) << 12) \
308 | (((p)[1] & 0x3F) << 6) \
309 | ((p)[2] & 0x3F)) \
310 : string_char ((p), NULL, NULL))
311
312
313 /* Like STRING_CHAR, but set ACTUAL_LEN to the length of multibyte
314 form.
315
316 Note: This macro returns the actual length of the character's
317 multibyte sequence as it is stored in a buffer or string. The
318 character it returns might have a different codepoint that has a
319 different multibyte sequence of a different length, due to possible
320 unification of CJK characters inside string_char. Therefore do NOT
321 assume that the length returned by this macro is identical to the
322 length of the multibyte sequence of the character it returns. */
323
324 #define STRING_CHAR_AND_LENGTH(p, actual_len) \
325 (!((p)[0] & 0x80) \
326 ? ((actual_len) = 1, (p)[0]) \
327 : ! ((p)[0] & 0x20) \
328 ? ((actual_len) = 2, \
329 (((((p)[0] & 0x1F) << 6) \
330 | ((p)[1] & 0x3F)) \
331 + (((unsigned char) (p)[0]) < 0xC2 ? 0x3FFF80 : 0))) \
332 : ! ((p)[0] & 0x10) \
333 ? ((actual_len) = 3, \
334 ((((p)[0] & 0x0F) << 12) \
335 | (((p)[1] & 0x3F) << 6) \
336 | ((p)[2] & 0x3F))) \
337 : string_char ((p), NULL, &actual_len))
338
339
340 /* Like STRING_CHAR, but advance P to the end of multibyte form. */
341
342 #define STRING_CHAR_ADVANCE(p) \
343 (!((p)[0] & 0x80) \
344 ? *(p)++ \
345 : ! ((p)[0] & 0x20) \
346 ? ((p) += 2, \
347 ((((p)[-2] & 0x1F) << 6) \
348 | ((p)[-1] & 0x3F) \
349 | ((unsigned char) ((p)[-2]) < 0xC2 ? 0x3FFF80 : 0))) \
350 : ! ((p)[0] & 0x10) \
351 ? ((p) += 3, \
352 ((((p)[-3] & 0x0F) << 12) \
353 | (((p)[-2] & 0x3F) << 6) \
354 | ((p)[-1] & 0x3F))) \
355 : string_char ((p), &(p), NULL))
356
357
358 /* Fetch the "next" character from Lisp string STRING at byte position
359 BYTEIDX, character position CHARIDX. Store it into OUTPUT.
360
361 All the args must be side-effect-free.
362 BYTEIDX and CHARIDX must be lvalues;
363 we increment them past the character fetched. */
364
365 #define FETCH_STRING_CHAR_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX) \
366 do \
367 { \
368 CHARIDX++; \
369 if (STRING_MULTIBYTE (STRING)) \
370 { \
371 unsigned char *chp = &SDATA (STRING)[BYTEIDX]; \
372 int chlen; \
373 \
374 OUTPUT = STRING_CHAR_AND_LENGTH (chp, chlen); \
375 BYTEIDX += chlen; \
376 } \
377 else \
378 { \
379 OUTPUT = SREF (STRING, BYTEIDX); \
380 BYTEIDX++; \
381 } \
382 } \
383 while (0)
384
385 /* Like FETCH_STRING_CHAR_ADVANCE, but return a multibyte character
386 even if STRING is unibyte. */
387
388 #define FETCH_STRING_CHAR_AS_MULTIBYTE_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX) \
389 do \
390 { \
391 CHARIDX++; \
392 if (STRING_MULTIBYTE (STRING)) \
393 { \
394 unsigned char *chp = &SDATA (STRING)[BYTEIDX]; \
395 int chlen; \
396 \
397 OUTPUT = STRING_CHAR_AND_LENGTH (chp, chlen); \
398 BYTEIDX += chlen; \
399 } \
400 else \
401 { \
402 OUTPUT = SREF (STRING, BYTEIDX); \
403 BYTEIDX++; \
404 MAKE_CHAR_MULTIBYTE (OUTPUT); \
405 } \
406 } \
407 while (0)
408
409
410 /* Like FETCH_STRING_CHAR_ADVANCE, but assumes STRING is multibyte. */
411
412 #define FETCH_STRING_CHAR_ADVANCE_NO_CHECK(OUTPUT, STRING, CHARIDX, BYTEIDX) \
413 do \
414 { \
415 unsigned char *fetch_ptr = &SDATA (STRING)[BYTEIDX]; \
416 int fetch_len; \
417 \
418 OUTPUT = STRING_CHAR_AND_LENGTH (fetch_ptr, fetch_len); \
419 BYTEIDX += fetch_len; \
420 CHARIDX++; \
421 } \
422 while (0)
423
424
425 /* Like FETCH_STRING_CHAR_ADVANCE, but fetch character from the current
426 buffer. */
427
428 #define FETCH_CHAR_ADVANCE(OUTPUT, CHARIDX, BYTEIDX) \
429 do \
430 { \
431 CHARIDX++; \
432 if (!NILP (BVAR (current_buffer, enable_multibyte_characters))) \
433 { \
434 unsigned char *chp = BYTE_POS_ADDR (BYTEIDX); \
435 int chlen; \
436 \
437 OUTPUT= STRING_CHAR_AND_LENGTH (chp, chlen); \
438 BYTEIDX += chlen; \
439 } \
440 else \
441 { \
442 OUTPUT = *(BYTE_POS_ADDR (BYTEIDX)); \
443 BYTEIDX++; \
444 } \
445 } \
446 while (0)
447
448
449 /* Like FETCH_CHAR_ADVANCE, but assumes the current buffer is multibyte. */
450
451 #define FETCH_CHAR_ADVANCE_NO_CHECK(OUTPUT, CHARIDX, BYTEIDX) \
452 do \
453 { \
454 unsigned char *chp = BYTE_POS_ADDR (BYTEIDX); \
455 int chlen; \
456 \
457 OUTPUT = STRING_CHAR_AND_LENGTH (chp, chlen); \
458 BYTEIDX += chlen; \
459 CHARIDX++; \
460 } \
461 while (0)
462
463
464 /* Increment the buffer byte position POS_BYTE of the current buffer to
465 the next character boundary. No range checking of POS. */
466
467 #define INC_POS(pos_byte) \
468 do { \
469 unsigned char *chp = BYTE_POS_ADDR (pos_byte); \
470 pos_byte += BYTES_BY_CHAR_HEAD (*chp); \
471 } while (0)
472
473
474 /* Decrement the buffer byte position POS_BYTE of the current buffer to
475 the previous character boundary. No range checking of POS. */
476
477 #define DEC_POS(pos_byte) \
478 do { \
479 unsigned char *chp; \
480 \
481 pos_byte--; \
482 if (pos_byte < GPT_BYTE) \
483 chp = BEG_ADDR + pos_byte - BEG_BYTE; \
484 else \
485 chp = BEG_ADDR + GAP_SIZE + pos_byte - BEG_BYTE; \
486 while (!CHAR_HEAD_P (*chp)) \
487 { \
488 chp--; \
489 pos_byte--; \
490 } \
491 } while (0)
492
493 /* Increment both CHARPOS and BYTEPOS, each in the appropriate way. */
494
495 #define INC_BOTH(charpos, bytepos) \
496 do \
497 { \
498 (charpos)++; \
499 if (NILP (BVAR (current_buffer, enable_multibyte_characters))) \
500 (bytepos)++; \
501 else \
502 INC_POS ((bytepos)); \
503 } \
504 while (0)
505
506
507 /* Decrement both CHARPOS and BYTEPOS, each in the appropriate way. */
508
509 #define DEC_BOTH(charpos, bytepos) \
510 do \
511 { \
512 (charpos)--; \
513 if (NILP (BVAR (current_buffer, enable_multibyte_characters))) \
514 (bytepos)--; \
515 else \
516 DEC_POS ((bytepos)); \
517 } \
518 while (0)
519
520
521 /* Increment the buffer byte position POS_BYTE of the current buffer to
522 the next character boundary. This macro relies on the fact that
523 *GPT_ADDR and *Z_ADDR are always accessible and the values are
524 '\0'. No range checking of POS_BYTE. */
525
526 #define BUF_INC_POS(buf, pos_byte) \
527 do { \
528 unsigned char *chp = BUF_BYTE_ADDRESS (buf, pos_byte); \
529 pos_byte += BYTES_BY_CHAR_HEAD (*chp); \
530 } while (0)
531
532
533 /* Decrement the buffer byte position POS_BYTE of the current buffer to
534 the previous character boundary. No range checking of POS_BYTE. */
535
536 #define BUF_DEC_POS(buf, pos_byte) \
537 do { \
538 unsigned char *chp; \
539 pos_byte--; \
540 if (pos_byte < BUF_GPT_BYTE (buf)) \
541 chp = BUF_BEG_ADDR (buf) + pos_byte - BEG_BYTE; \
542 else \
543 chp = BUF_BEG_ADDR (buf) + BUF_GAP_SIZE (buf) + pos_byte - BEG_BYTE;\
544 while (!CHAR_HEAD_P (*chp)) \
545 { \
546 chp--; \
547 pos_byte--; \
548 } \
549 } while (0)
550
551
552 /* If C is a character to be unified with a Unicode character, return
553 the unified Unicode character. */
554
555 #define MAYBE_UNIFY_CHAR(c) \
556 do { \
557 if (c > MAX_UNICODE_CHAR && c <= MAX_5_BYTE_CHAR) \
558 { \
559 Lisp_Object val; \
560 val = CHAR_TABLE_REF (Vchar_unify_table, c); \
561 if (INTEGERP (val)) \
562 c = XFASTINT (val); \
563 else if (! NILP (val)) \
564 c = maybe_unify_char (c, val); \
565 } \
566 } while (0)
567
568
569 /* Return a non-outlandish value for the tab width. */
570
571 #define SANE_TAB_WIDTH(buf) \
572 sanitize_tab_width (XFASTINT (BVAR (buf, tab_width)))
573 static inline int
574 sanitize_tab_width (EMACS_INT width)
575 {
576 return 0 < width && width <= 1000 ? width : 8;
577 }
578
579 /* Return the width of ASCII character C. The width is measured by
580 how many columns C will occupy on the screen when displayed in the
581 current buffer. */
582
583 #define ASCII_CHAR_WIDTH(c) \
584 (c < 0x20 \
585 ? (c == '\t' \
586 ? SANE_TAB_WIDTH (current_buffer) \
587 : (c == '\n' ? 0 : (NILP (BVAR (current_buffer, ctl_arrow)) ? 4 : 2))) \
588 : (c < 0x7f \
589 ? 1 \
590 : ((NILP (BVAR (current_buffer, ctl_arrow)) ? 4 : 2))))
591
592 /* Return a non-outlandish value for a character width. */
593
594 static inline int
595 sanitize_char_width (EMACS_INT width)
596 {
597 return 0 <= width && width <= 1000 ? width : 1000;
598 }
599
600 /* Return the width of character C. The width is measured by how many
601 columns C will occupy on the screen when displayed in the current
602 buffer. */
603
604 #define CHAR_WIDTH(c) \
605 (ASCII_CHAR_P (c) \
606 ? ASCII_CHAR_WIDTH (c) \
607 : sanitize_char_width (XINT (CHAR_TABLE_REF (Vchar_width_table, c))))
608
609 /* If C is a variation selector, return the index of the
610 variation selector (1..256). Otherwise, return 0. */
611
612 #define CHAR_VARIATION_SELECTOR_P(c) \
613 ((c) < 0xFE00 ? 0 \
614 : (c) <= 0xFE0F ? (c) - 0xFE00 + 1 \
615 : (c) < 0xE0100 ? 0 \
616 : (c) <= 0xE01EF ? (c) - 0xE0100 + 17 \
617 : 0)
618
619 /* If C is a high surrogate, return 1. If C is a low surrogate,
620 return 0. Otherwise, return 0. */
621
622 #define CHAR_SURROGATE_PAIR_P(c) \
623 ((c) < 0xD800 ? 0 \
624 : (c) <= 0xDBFF ? 1 \
625 : (c) <= 0xDFFF ? 2 \
626 : 0)
627
628 /* Data type for Unicode general category.
629
630 The order of members must be in sync with the 8th element of the
631 member of unidata-prop-alist (in admin/unidata/unidata-getn.el) for
632 Unicode character property `general-category'. */
633
634 typedef enum {
635 UNICODE_CATEGORY_UNKNOWN = 0,
636 UNICODE_CATEGORY_Lu,
637 UNICODE_CATEGORY_Ll,
638 UNICODE_CATEGORY_Lt,
639 UNICODE_CATEGORY_Lm,
640 UNICODE_CATEGORY_Lo,
641 UNICODE_CATEGORY_Mn,
642 UNICODE_CATEGORY_Mc,
643 UNICODE_CATEGORY_Me,
644 UNICODE_CATEGORY_Nd,
645 UNICODE_CATEGORY_Nl,
646 UNICODE_CATEGORY_No,
647 UNICODE_CATEGORY_Pc,
648 UNICODE_CATEGORY_Pd,
649 UNICODE_CATEGORY_Ps,
650 UNICODE_CATEGORY_Pe,
651 UNICODE_CATEGORY_Pi,
652 UNICODE_CATEGORY_Pf,
653 UNICODE_CATEGORY_Po,
654 UNICODE_CATEGORY_Sm,
655 UNICODE_CATEGORY_Sc,
656 UNICODE_CATEGORY_Sk,
657 UNICODE_CATEGORY_So,
658 UNICODE_CATEGORY_Zs,
659 UNICODE_CATEGORY_Zl,
660 UNICODE_CATEGORY_Zp,
661 UNICODE_CATEGORY_Cc,
662 UNICODE_CATEGORY_Cf,
663 UNICODE_CATEGORY_Cs,
664 UNICODE_CATEGORY_Co,
665 UNICODE_CATEGORY_Cn
666 } unicode_category_t;
667
668 extern int char_resolve_modifier_mask (int);
669 extern int char_string (unsigned, unsigned char *);
670 extern int string_char (const unsigned char *,
671 const unsigned char **, int *);
672
673 extern int translate_char (Lisp_Object, int c);
674 extern int char_printable_p (int c);
675 extern void parse_str_as_multibyte (const unsigned char *,
676 EMACS_INT, EMACS_INT *, EMACS_INT *);
677 extern EMACS_INT count_size_as_multibyte (const unsigned char *, EMACS_INT);
678 extern EMACS_INT str_as_multibyte (unsigned char *, EMACS_INT, EMACS_INT,
679 EMACS_INT *);
680 extern EMACS_INT str_to_multibyte (unsigned char *, EMACS_INT, EMACS_INT);
681 extern EMACS_INT str_as_unibyte (unsigned char *, EMACS_INT);
682 extern EMACS_INT str_to_unibyte (const unsigned char *, unsigned char *,
683 EMACS_INT, int);
684 extern EMACS_INT strwidth (const char *, EMACS_INT);
685 extern EMACS_INT c_string_width (const unsigned char *, EMACS_INT, int,
686 EMACS_INT *, EMACS_INT *);
687 extern EMACS_INT lisp_string_width (Lisp_Object, EMACS_INT,
688 EMACS_INT *, EMACS_INT *);
689
690 extern Lisp_Object Qcharacterp;
691 extern Lisp_Object Vchar_unify_table;
692 extern Lisp_Object string_escape_byte8 (Lisp_Object);
693
694 /* Return a translation table of id number ID. */
695 #define GET_TRANSLATION_TABLE(id) \
696 (XCDR(XVECTOR(Vtranslation_table_vector)->contents[(id)]))
697
698 #endif /* EMACS_CHARACTER_H */
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