Commit | Line | Data |
---|---|---|
0168c3d8 KH |
1 | /* Basic character support. |
2 | Copyright (C) 1995, 1997, 1998, 2001 Electrotechnical Laboratory, JAPAN. | |
3 | Licensed to the Free Software Foundation. | |
4 | Copyright (C) 2001 Free Software Foundation, Inc. | |
5 | Copyright (C) 2001, 2002 | |
6 | National Institute of Advanced Industrial Science and Technology (AIST) | |
7 | Registration Number H13PRO009 | |
8 | ||
9 | This file is part of GNU Emacs. | |
10 | ||
11 | GNU Emacs is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2, or (at your option) | |
14 | any later version. | |
15 | ||
16 | GNU Emacs is distributed in the hope that it will be useful, | |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
22 | along with GNU Emacs; see the file COPYING. If not, write to | |
23 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | Boston, MA 02111-1307, USA. */ | |
25 | ||
26 | /* At first, see the document in `character.h' to understand the code | |
27 | in this file. */ | |
28 | ||
29 | #ifdef emacs | |
30 | #include <config.h> | |
31 | #endif | |
32 | ||
33 | #include <stdio.h> | |
34 | ||
35 | #ifdef emacs | |
36 | ||
37 | #include <sys/types.h> | |
38 | #include "lisp.h" | |
39 | #include "character.h" | |
40 | #include "buffer.h" | |
41 | #include "charset.h" | |
42 | #include "composite.h" | |
43 | #include "disptab.h" | |
44 | ||
45 | #else /* not emacs */ | |
46 | ||
47 | #include "mulelib.h" | |
48 | ||
49 | #endif /* emacs */ | |
50 | ||
51 | Lisp_Object Qcharacterp; | |
52 | ||
53 | /* Vector of translation table ever defined. | |
54 | ID of a translation table is used to index this vector. */ | |
55 | Lisp_Object Vtranslation_table_vector; | |
56 | ||
57 | /* A char-table for characters which may invoke auto-filling. */ | |
58 | Lisp_Object Vauto_fill_chars; | |
59 | ||
60 | Lisp_Object Qauto_fill_chars; | |
61 | ||
62 | Lisp_Object Vchar_unify_table; | |
63 | ||
64 | /* A char-table. An element is non-nil iff the corresponding | |
65 | character has a printable glyph. */ | |
66 | Lisp_Object Vprintable_chars; | |
67 | ||
68 | /* A char-table. An elemnent is a column-width of the corresponding | |
69 | character. */ | |
70 | Lisp_Object Vchar_width_table; | |
71 | ||
72 | /* A char-table. An element is a symbol indicating the direction | |
73 | property of corresponding character. */ | |
74 | Lisp_Object Vchar_direction_table; | |
75 | ||
76 | /* Variables used locally in the macro FETCH_MULTIBYTE_CHAR. */ | |
77 | unsigned char *_fetch_multibyte_char_p; | |
78 | int _fetch_multibyte_char_len; | |
79 | ||
80 | \f | |
81 | ||
82 | int | |
83 | char_string_with_unification (c, p, advanced) | |
84 | int c; | |
85 | unsigned char *p, **advanced; | |
86 | { | |
87 | int bytes; | |
88 | ||
89 | MAYBE_UNIFY_CHAR (c); | |
90 | ||
91 | if (c <= MAX_3_BYTE_CHAR || c > MAX_5_BYTE_CHAR) | |
92 | { | |
93 | bytes = CHAR_STRING (c, p); | |
94 | } | |
95 | else if (c <= MAX_4_BYTE_CHAR) | |
96 | { | |
97 | p[0] = (0xF0 | (c >> 18)); | |
98 | p[1] = (0x80 | ((c >> 12) & 0x3F)); | |
99 | p[2] = (0x80 | ((c >> 6) & 0x3F)); | |
100 | p[3] = (0x80 | (c & 0x3F)); | |
101 | bytes = 4; | |
102 | } | |
103 | else | |
104 | { | |
105 | p[0] = 0xF8; | |
106 | p[1] = (0x80 | ((c >> 18) & 0x0F)); | |
107 | p[2] = (0x80 | ((c >> 12) & 0x3F)); | |
108 | p[3] = (0x80 | ((c >> 6) & 0x3F)); | |
109 | p[4] = (0x80 | (c & 0x3F)); | |
110 | bytes = 5; | |
111 | } | |
112 | if (advanced) | |
113 | *advanced = p + bytes; | |
114 | return bytes; | |
115 | } | |
116 | ||
117 | ||
118 | int | |
119 | string_char_with_unification (p, advanced, len) | |
120 | unsigned char *p, **advanced; | |
121 | int *len; | |
122 | { | |
123 | int c, unified; | |
124 | unsigned char *saved_p = p; | |
125 | ||
126 | if (*p < 0x80 || ! (*p & 0x20) || ! (*p & 0x10)) | |
127 | { | |
128 | c = STRING_CHAR_ADVANCE (p); | |
129 | } | |
130 | else if (! (*p & 0x08)) | |
131 | { | |
132 | c = ((((p)[0] & 0xF) << 18) | |
133 | | (((p)[1] & 0x3F) << 12) | |
134 | | (((p)[2] & 0x3F) << 6) | |
135 | | ((p)[3] & 0x3F)); | |
136 | p += 4; | |
137 | } | |
138 | else | |
139 | { | |
140 | c = ((((p)[1] & 0x3F) << 18) | |
141 | | (((p)[2] & 0x3F) << 12) | |
142 | | (((p)[3] & 0x3F) << 6) | |
143 | | ((p)[4] & 0x3F)); | |
144 | p += 5; | |
145 | } | |
146 | ||
147 | MAYBE_UNIFY_CHAR (c); | |
148 | ||
149 | if (len) | |
150 | *len = p - saved_p; | |
151 | if (advanced) | |
152 | *advanced = p; | |
153 | return c; | |
154 | } | |
155 | ||
156 | ||
157 | /* Translate character C by translation table TABLE. If C is | |
158 | negative, translate a character specified by CHARSET and CODE. If | |
159 | no translation is found in TABLE, return the untranslated | |
160 | character. */ | |
161 | ||
162 | int | |
163 | translate_char (table, c) | |
164 | Lisp_Object table; | |
165 | int c; | |
166 | { | |
167 | Lisp_Object ch; | |
168 | ||
169 | if (! CHAR_TABLE_P (table)) | |
170 | return c; | |
171 | ch = CHAR_TABLE_REF (table, c); | |
172 | if (! CHARACTERP (ch)) | |
173 | return c; | |
174 | return XINT (ch); | |
175 | } | |
176 | ||
177 | /* Convert the unibyte character C to the corresponding multibyte | |
178 | character based on the current value of charset_primary. If C | |
179 | can't be converted, return C. */ | |
180 | ||
181 | int | |
182 | unibyte_char_to_multibyte (c) | |
183 | int c; | |
184 | { | |
185 | struct charset *charset = CHARSET_FROM_ID (charset_primary); | |
186 | int c1 = DECODE_CHAR (charset, c); | |
187 | ||
188 | return ((c1 >= 0) ? c1 : c); | |
189 | } | |
190 | ||
191 | ||
192 | /* Convert the multibyte character C to unibyte 8-bit character based | |
193 | on the current value of charset_primary. If dimension of | |
194 | charset_primary is more than one, return (C & 0xFF). | |
195 | ||
196 | The argument REV_TBL is now ignored. It will be removed in the | |
197 | future. */ | |
198 | ||
199 | int | |
200 | multibyte_char_to_unibyte (c, rev_tbl) | |
201 | int c; | |
202 | Lisp_Object rev_tbl; | |
203 | { | |
204 | struct charset *charset = CHARSET_FROM_ID (charset_primary); | |
205 | unsigned c1 = ENCODE_CHAR (charset, c); | |
206 | ||
207 | return ((c1 != CHARSET_INVALID_CODE (charset)) ? c1 : c & 0xFF); | |
208 | } | |
209 | ||
210 | ||
211 | DEFUN ("characterp", Fcharacterp, Scharacterp, 1, 2, 0, | |
212 | doc: /* Return non-nil if OBJECT is a character. */) | |
213 | (object, ignore) | |
214 | Lisp_Object object, ignore; | |
215 | { | |
216 | return (CHARACTERP (object) ? Qt : Qnil); | |
217 | } | |
218 | ||
219 | DEFUN ("max-char", Fmax_char, Smax_char, 0, 0, 0, | |
220 | doc: /* Return the character of the maximum code. */) | |
221 | () | |
222 | { | |
223 | return make_number (MAX_CHAR); | |
224 | } | |
225 | ||
226 | DEFUN ("unibyte-char-to-multibyte", Funibyte_char_to_multibyte, | |
227 | Sunibyte_char_to_multibyte, 1, 1, 0, | |
228 | doc: /* Convert the unibyte character CH to multibyte character. | |
229 | The multibyte character is a result of decoding CH by | |
230 | the current primary charset (value of `charset-primary'). */) | |
231 | (ch) | |
232 | Lisp_Object ch; | |
233 | { | |
234 | int c; | |
235 | struct charset *charset; | |
236 | ||
237 | CHECK_CHARACTER (ch); | |
238 | c = XFASTINT (ch); | |
239 | if (c >= 0400) | |
240 | error ("Invalid unibyte character: %d", c); | |
241 | charset = CHARSET_FROM_ID (charset_primary); | |
242 | c = DECODE_CHAR (charset, c); | |
243 | if (c < 0) | |
244 | error ("Can't convert to multibyte character: %d", XINT (ch)); | |
245 | return make_number (c); | |
246 | } | |
247 | ||
248 | DEFUN ("multibyte-char-to-unibyte", Fmultibyte_char_to_unibyte, | |
249 | Smultibyte_char_to_unibyte, 1, 1, 0, | |
250 | doc: /* Convert the multibyte character CH to unibyte character.\n\ | |
251 | The unibyte character is a result of encoding CH by | |
252 | the current primary charset (value of `charset-primary'). */) | |
253 | (ch) | |
254 | Lisp_Object ch; | |
255 | { | |
256 | int c; | |
257 | unsigned code; | |
258 | struct charset *charset; | |
259 | ||
260 | CHECK_CHARACTER (ch); | |
261 | c = XFASTINT (ch); | |
262 | charset = CHARSET_FROM_ID (charset_primary); | |
263 | code = ENCODE_CHAR (charset, c); | |
264 | if (code < CHARSET_MIN_CODE (charset) | |
265 | || code > CHARSET_MAX_CODE (charset)) | |
266 | error ("Can't convert to unibyte character: %d", XINT (ch)); | |
267 | return make_number (code); | |
268 | } | |
269 | ||
270 | DEFUN ("char-bytes", Fchar_bytes, Schar_bytes, 1, 1, 0, | |
271 | doc: /* Return 1 regardless of the argument CHAR. | |
272 | This is now an obsolete function. We keep it just for backward compatibility. */) | |
273 | (ch) | |
274 | Lisp_Object ch; | |
275 | { | |
276 | CHECK_CHARACTER (ch); | |
277 | return make_number (1); | |
278 | } | |
279 | ||
280 | DEFUN ("char-width", Fchar_width, Schar_width, 1, 1, 0, | |
281 | doc: /* Return width of CHAR when displayed in the current buffer. | |
282 | The width is measured by how many columns it occupies on the screen. | |
283 | Tab is taken to occupy `tab-width' columns. */) | |
284 | (ch) | |
285 | Lisp_Object ch; | |
286 | { | |
287 | Lisp_Object disp; | |
288 | int c, width; | |
289 | struct Lisp_Char_Table *dp = buffer_display_table (); | |
290 | ||
291 | CHECK_CHARACTER (ch); | |
292 | c = XINT (ch); | |
293 | ||
294 | /* Get the way the display table would display it. */ | |
295 | disp = dp ? DISP_CHAR_VECTOR (dp, c) : Qnil; | |
296 | ||
297 | if (VECTORP (disp)) | |
298 | width = ASIZE (disp); | |
299 | else | |
300 | width = CHAR_WIDTH (c); | |
301 | ||
302 | return make_number (width); | |
303 | } | |
304 | ||
305 | /* Return width of string STR of length LEN when displayed in the | |
306 | current buffer. The width is measured by how many columns it | |
307 | occupies on the screen. */ | |
308 | ||
309 | int | |
310 | strwidth (str, len) | |
311 | unsigned char *str; | |
312 | int len; | |
313 | { | |
314 | return c_string_width (str, len, -1, NULL, NULL); | |
315 | } | |
316 | ||
317 | /* Return width of string STR of length LEN when displayed in the | |
318 | current buffer. The width is measured by how many columns it | |
319 | occupies on the screen. If PRECISION > 0, return the width of | |
320 | longest substring that doesn't exceed PRECISION, and set number of | |
321 | characters and bytes of the substring in *NCHARS and *NBYTES | |
322 | respectively. */ | |
323 | ||
324 | c_string_width (str, len, precision, nchars, nbytes) | |
325 | unsigned char *str; | |
326 | int precision, *nchars, *nbytes; | |
327 | { | |
328 | int i = 0, i_byte = 0; | |
329 | int width = 0; | |
330 | struct Lisp_Char_Table *dp = buffer_display_table (); | |
331 | ||
332 | while (i_byte < len) | |
333 | { | |
334 | int bytes, thiswidth; | |
335 | Lisp_Object val; | |
336 | int c = STRING_CHAR_AND_LENGTH (str + i_byte, len - i_byte, bytes); | |
337 | ||
338 | if (dp) | |
339 | { | |
340 | val = DISP_CHAR_VECTOR (dp, c); | |
341 | if (VECTORP (val)) | |
342 | thiswidth = XVECTOR (val)->size; | |
343 | else | |
344 | thiswidth = CHAR_WIDTH (c); | |
345 | } | |
346 | else | |
347 | { | |
348 | thiswidth = CHAR_WIDTH (c); | |
349 | } | |
350 | ||
351 | if (precision > 0 | |
352 | && (width + thiswidth > precision)) | |
353 | { | |
354 | *nchars = i; | |
355 | *nbytes = i_byte; | |
356 | return width; | |
357 | } | |
358 | i++; | |
359 | i_byte += bytes; | |
360 | width += thiswidth; | |
361 | } | |
362 | ||
363 | if (precision > 0) | |
364 | { | |
365 | *nchars = i; | |
366 | *nbytes = i_byte; | |
367 | } | |
368 | ||
369 | return width; | |
370 | } | |
371 | ||
372 | /* Return width of Lisp string STRING when displayed in the current | |
373 | buffer. The width is measured by how many columns it occupies on | |
374 | the screen while paying attention to compositions. If PRECISION > | |
375 | 0, return the width of longest substring that doesn't exceed | |
376 | PRECISION, and set number of characters and bytes of the substring | |
377 | in *NCHARS and *NBYTES respectively. */ | |
378 | ||
379 | int | |
380 | lisp_string_width (string, precision, nchars, nbytes) | |
381 | Lisp_Object string; | |
382 | int precision, *nchars, *nbytes; | |
383 | { | |
384 | int len = XSTRING (string)->size; | |
385 | int len_byte = STRING_BYTES (XSTRING (string)); | |
386 | unsigned char *str = XSTRING (string)->data; | |
387 | int i = 0, i_byte = 0; | |
388 | int width = 0; | |
389 | struct Lisp_Char_Table *dp = buffer_display_table (); | |
390 | ||
391 | while (i < len) | |
392 | { | |
393 | int chars, bytes, thiswidth; | |
394 | Lisp_Object val; | |
395 | int cmp_id; | |
396 | int ignore, end; | |
397 | ||
398 | if (find_composition (i, -1, &ignore, &end, &val, string) | |
399 | && ((cmp_id = get_composition_id (i, i_byte, end - i, val, string)) | |
400 | >= 0)) | |
401 | { | |
402 | thiswidth = composition_table[cmp_id]->width; | |
403 | chars = end - i; | |
404 | bytes = string_char_to_byte (string, end) - i_byte; | |
405 | } | |
406 | else if (dp) | |
407 | { | |
408 | int c = STRING_CHAR_AND_LENGTH (str + i_byte, len - i_byte, bytes); | |
409 | ||
410 | chars = 1; | |
411 | val = DISP_CHAR_VECTOR (dp, c); | |
412 | if (VECTORP (val)) | |
413 | thiswidth = XVECTOR (val)->size; | |
414 | else | |
415 | thiswidth = CHAR_WIDTH (c); | |
416 | } | |
417 | else | |
418 | { | |
419 | int c = STRING_CHAR_AND_LENGTH (str + i_byte, len - i_byte, bytes); | |
420 | ||
421 | chars = 1; | |
422 | thiswidth = CHAR_WIDTH (c); | |
423 | } | |
424 | ||
425 | if (precision > 0 | |
426 | && (width + thiswidth > precision)) | |
427 | { | |
428 | *nchars = i; | |
429 | *nbytes = i_byte; | |
430 | return width; | |
431 | } | |
432 | i += chars; | |
433 | i_byte += bytes; | |
434 | width += thiswidth; | |
435 | } | |
436 | ||
437 | if (precision > 0) | |
438 | { | |
439 | *nchars = i; | |
440 | *nbytes = i_byte; | |
441 | } | |
442 | ||
443 | return width; | |
444 | } | |
445 | ||
446 | DEFUN ("string-width", Fstring_width, Sstring_width, 1, 1, 0, | |
447 | doc: /* Return width of STRING when displayed in the current buffer. | |
448 | Width is measured by how many columns it occupies on the screen. | |
449 | When calculating width of a multibyte character in STRING, | |
450 | only the base leading-code is considered; the validity of | |
451 | the following bytes is not checked. Tabs in STRING are always | |
452 | taken to occupy `tab-width' columns. */) | |
453 | (str) | |
454 | Lisp_Object str; | |
455 | { | |
456 | Lisp_Object val; | |
457 | ||
458 | CHECK_STRING (str); | |
459 | XSETFASTINT (val, lisp_string_width (str, -1, NULL, NULL)); | |
460 | return val; | |
461 | } | |
462 | ||
463 | DEFUN ("char-direction", Fchar_direction, Schar_direction, 1, 1, 0, | |
464 | doc: /* Return the direction of CHAR. | |
465 | The returned value is 0 for left-to-right and 1 for right-to-left. */) | |
466 | (ch) | |
467 | Lisp_Object ch; | |
468 | { | |
469 | int c; | |
470 | ||
471 | CHECK_CHARACTER (ch); | |
472 | c = XINT (ch); | |
473 | return CHAR_TABLE_REF (Vchar_direction_table, c); | |
474 | } | |
475 | ||
476 | DEFUN ("chars-in-region", Fchars_in_region, Schars_in_region, 2, 2, 0, | |
477 | doc: /* Return number of characters between BEG and END. | |
478 | This is now an obsolete function. We keep it just for backward compatibility. */) | |
479 | (beg, end) | |
480 | Lisp_Object beg, end; | |
481 | { | |
482 | int from, to; | |
483 | ||
484 | CHECK_NUMBER_COERCE_MARKER (beg); | |
485 | CHECK_NUMBER_COERCE_MARKER (end); | |
486 | ||
487 | from = min (XFASTINT (beg), XFASTINT (end)); | |
488 | to = max (XFASTINT (beg), XFASTINT (end)); | |
489 | ||
490 | return make_number (to - from); | |
491 | } | |
492 | ||
493 | /* Return the number of characters in the NBYTES bytes at PTR. | |
494 | This works by looking at the contents and checking for multibyte | |
495 | sequences while assuming that there's no invalid sequence. | |
496 | However, if the current buffer has enable-multibyte-characters = | |
497 | nil, we treat each byte as a character. */ | |
498 | ||
499 | int | |
500 | chars_in_text (ptr, nbytes) | |
501 | unsigned char *ptr; | |
502 | int nbytes; | |
503 | { | |
504 | /* current_buffer is null at early stages of Emacs initialization. */ | |
505 | if (current_buffer == 0 | |
506 | || NILP (current_buffer->enable_multibyte_characters)) | |
507 | return nbytes; | |
508 | ||
509 | return multibyte_chars_in_text (ptr, nbytes); | |
510 | } | |
511 | ||
512 | /* Return the number of characters in the NBYTES bytes at PTR. | |
513 | This works by looking at the contents and checking for multibyte | |
514 | sequences while assuming that there's no invalid sequence. It | |
515 | ignores enable-multibyte-characters. */ | |
516 | ||
517 | int | |
518 | multibyte_chars_in_text (ptr, nbytes) | |
519 | unsigned char *ptr; | |
520 | int nbytes; | |
521 | { | |
522 | unsigned char *endp = ptr + nbytes; | |
523 | int chars = 0; | |
524 | ||
525 | while (ptr < endp) | |
526 | { | |
527 | int len = MULTIBYTE_LENGTH (ptr, endp); | |
528 | ||
529 | if (len == 0) | |
530 | abort (); | |
531 | ptr += len; | |
532 | chars++; | |
533 | } | |
534 | ||
535 | return chars; | |
536 | } | |
537 | ||
538 | /* Parse unibyte text at STR of LEN bytes as a multibyte text, count | |
539 | characters and bytes in it, and store them in *NCHARS and *NBYTES | |
540 | respectively. On counting bytes, pay attention to that 8-bit | |
541 | characters not constructing a valid multibyte sequence are | |
542 | represented by 2-byte in a multibyte text. */ | |
543 | ||
544 | void | |
545 | parse_str_as_multibyte (str, len, nchars, nbytes) | |
546 | unsigned char *str; | |
547 | int len, *nchars, *nbytes; | |
548 | { | |
549 | unsigned char *endp = str + len; | |
550 | int n, chars = 0, bytes = 0; | |
551 | ||
552 | if (len >= MAX_MULTIBYTE_LENGTH) | |
553 | { | |
554 | unsigned char *adjusted_endp = endp - MAX_MULTIBYTE_LENGTH; | |
555 | while (str < adjusted_endp) | |
556 | { | |
557 | if ((n = MULTIBYTE_LENGTH_NO_CHECK (str)) > 0) | |
558 | str += n, bytes += n; | |
559 | else | |
560 | str++, bytes += 2; | |
561 | chars++; | |
562 | } | |
563 | } | |
564 | while (str < endp) | |
565 | { | |
566 | if ((n = MULTIBYTE_LENGTH (str, endp)) > 0) | |
567 | str += n, bytes += n; | |
568 | else | |
569 | str++, bytes += 2; | |
570 | chars++; | |
571 | } | |
572 | ||
573 | *nchars = chars; | |
574 | *nbytes = bytes; | |
575 | return; | |
576 | } | |
577 | ||
578 | /* Arrange unibyte text at STR of NBYTES bytes as a multibyte text. | |
579 | It actually converts only such 8-bit characters that don't contruct | |
580 | a multibyte sequence to multibyte forms of Latin-1 characters. If | |
581 | NCHARS is nonzero, set *NCHARS to the number of characters in the | |
582 | text. It is assured that we can use LEN bytes at STR as a work | |
583 | area and that is enough. Return the number of bytes of the | |
584 | resulting text. */ | |
585 | ||
586 | int | |
587 | str_as_multibyte (str, len, nbytes, nchars) | |
588 | unsigned char *str; | |
589 | int len, nbytes, *nchars; | |
590 | { | |
591 | unsigned char *p = str, *endp = str + nbytes; | |
592 | unsigned char *to; | |
593 | int chars = 0; | |
594 | int n; | |
595 | ||
596 | if (nbytes >= MAX_MULTIBYTE_LENGTH) | |
597 | { | |
598 | unsigned char *adjusted_endp = endp - MAX_MULTIBYTE_LENGTH; | |
599 | while (p < adjusted_endp | |
600 | && (n = MULTIBYTE_LENGTH_NO_CHECK (p)) > 0) | |
601 | p += n, chars++; | |
602 | } | |
603 | while ((n = MULTIBYTE_LENGTH (p, endp)) > 0) | |
604 | p += n, chars++; | |
605 | if (nchars) | |
606 | *nchars = chars; | |
607 | if (p == endp) | |
608 | return nbytes; | |
609 | ||
610 | to = p; | |
611 | nbytes = endp - p; | |
612 | endp = str + len; | |
613 | safe_bcopy ((char *) p, (char *) (endp - nbytes), nbytes); | |
614 | p = endp - nbytes; | |
615 | ||
616 | if (nbytes >= MAX_MULTIBYTE_LENGTH) | |
617 | { | |
618 | unsigned char *adjusted_endp = endp - MAX_MULTIBYTE_LENGTH; | |
619 | while (p < adjusted_endp) | |
620 | { | |
621 | if ((n = MULTIBYTE_LENGTH_NO_CHECK (p)) > 0) | |
622 | { | |
623 | while (n--) | |
624 | *to++ = *p++; | |
625 | } | |
626 | else | |
627 | { | |
628 | int c = *p++; | |
629 | c = BYTE8_TO_CHAR (c); | |
630 | to += CHAR_STRING (c, to); | |
631 | } | |
632 | } | |
633 | chars++; | |
634 | } | |
635 | while (p < endp) | |
636 | { | |
637 | if ((n = MULTIBYTE_LENGTH (p, endp)) > 0) | |
638 | { | |
639 | while (n--) | |
640 | *to++ = *p++; | |
641 | } | |
642 | else | |
643 | { | |
644 | int c = *p++; | |
645 | c = BYTE8_TO_CHAR (c); | |
646 | to += CHAR_STRING (c, to); | |
647 | } | |
648 | chars++; | |
649 | } | |
650 | if (nchars) | |
651 | *nchars = chars; | |
652 | return (to - str); | |
653 | } | |
654 | ||
655 | /* Parse unibyte string at STR of LEN bytes, and return the number of | |
656 | bytes it may ocupy when converted to multibyte string by | |
657 | `str_to_multibyte'. */ | |
658 | ||
659 | int | |
660 | parse_str_to_multibyte (str, len) | |
661 | unsigned char *str; | |
662 | int len; | |
663 | { | |
664 | unsigned char *endp = str + len; | |
665 | int bytes; | |
666 | ||
667 | for (bytes = 0; str < endp; str++) | |
668 | bytes += (*str < 0x80) ? 1 : 2; | |
669 | return bytes; | |
670 | } | |
671 | ||
672 | ||
673 | /* Convert unibyte text at STR of NBYTES bytes to a multibyte text | |
674 | that contains the same single-byte characters. It actually | |
675 | converts all 8-bit characters to multibyte forms. It is assured | |
676 | that we can use LEN bytes at STR as a work area and that is | |
677 | enough. */ | |
678 | ||
679 | int | |
680 | str_to_multibyte (str, len, bytes) | |
681 | unsigned char *str; | |
682 | int len, bytes; | |
683 | { | |
684 | unsigned char *p = str, *endp = str + bytes; | |
685 | unsigned char *to; | |
686 | ||
687 | while (p < endp && *p < 0x80) p++; | |
688 | if (p == endp) | |
689 | return bytes; | |
690 | to = p; | |
691 | bytes = endp - p; | |
692 | endp = str + len; | |
693 | safe_bcopy ((char *) p, (char *) (endp - bytes), bytes); | |
694 | p = endp - bytes; | |
695 | while (p < endp) | |
696 | { | |
697 | int c = *p++; | |
698 | ||
699 | if (c >= 0x80) | |
700 | c = BYTE8_TO_CHAR (c); | |
701 | to += CHAR_STRING (c, to); | |
702 | } | |
703 | return (to - str); | |
704 | } | |
705 | ||
706 | /* Arrange multibyte text at STR of LEN bytes as a unibyte text. It | |
707 | actually converts characters in the range 0x80..0xFF to | |
708 | unibyte. */ | |
709 | ||
710 | int | |
711 | str_as_unibyte (str, bytes) | |
712 | unsigned char *str; | |
713 | int bytes; | |
714 | { | |
715 | unsigned char *p = str, *endp = str + bytes; | |
716 | unsigned char *to = str; | |
717 | int c, len; | |
718 | ||
719 | while (p < endp) | |
720 | { | |
721 | c = *p; | |
722 | len = BYTES_BY_CHAR_HEAD (c); | |
723 | if (CHAR_BYTE8_HEAD_P (c)) | |
724 | break; | |
725 | p += len; | |
726 | } | |
727 | to = p; | |
728 | while (p < endp) | |
729 | { | |
730 | c = *p; | |
731 | len = BYTES_BY_CHAR_HEAD (c); | |
732 | if (CHAR_BYTE8_HEAD_P (c)) | |
733 | { | |
734 | c = STRING_CHAR_ADVANCE (p); | |
735 | *to++ = CHAR_TO_BYTE8 (c); | |
736 | } | |
737 | else | |
738 | { | |
739 | while (len--) *to++ = *p++; | |
740 | } | |
741 | } | |
742 | return (to - str); | |
743 | } | |
744 | ||
745 | int | |
746 | string_count_byte8 (string) | |
747 | Lisp_Object string; | |
748 | { | |
749 | int multibyte = STRING_MULTIBYTE (string); | |
750 | int nchars = XSTRING (string)->size; | |
751 | int nbytes = STRING_BYTES (XSTRING (string)); | |
752 | unsigned char *p = XSTRING (string)->data; | |
753 | unsigned char *pend = p + nbytes; | |
754 | int count = 0; | |
755 | int c, len; | |
756 | ||
757 | if (multibyte) | |
758 | while (p < pend) | |
759 | { | |
760 | c = *p; | |
761 | len = BYTES_BY_CHAR_HEAD (c); | |
762 | ||
763 | if (CHAR_BYTE8_HEAD_P (c)) | |
764 | count++; | |
765 | p += len; | |
766 | } | |
767 | else | |
768 | while (p < pend) | |
769 | { | |
770 | if (*p++ >= 0x80) | |
771 | count++; | |
772 | } | |
773 | return count; | |
774 | } | |
775 | ||
776 | ||
777 | Lisp_Object | |
778 | string_escape_byte8 (string) | |
779 | Lisp_Object string; | |
780 | { | |
781 | int nchars = XSTRING (string)->size; | |
782 | int nbytes = STRING_BYTES (XSTRING (string)); | |
783 | int multibyte = STRING_MULTIBYTE (string); | |
784 | int byte8_count; | |
785 | unsigned char *src, *src_end, *dst; | |
786 | Lisp_Object val; | |
787 | int c, len; | |
788 | ||
789 | if (multibyte && nchars == nbytes) | |
790 | return string; | |
791 | ||
792 | byte8_count = string_count_byte8 (string); | |
793 | ||
794 | if (byte8_count == 0) | |
795 | return string; | |
796 | ||
797 | if (multibyte) | |
798 | /* Convert 2-byte sequence of byte8 chars to 4-byte octal. */ | |
799 | val = make_uninit_multibyte_string (nchars + byte8_count * 2, | |
800 | nbytes + byte8_count * 2); | |
801 | else | |
802 | /* Convert 1-byte sequence of byte8 chars to 4-byte octal. */ | |
803 | val = make_uninit_string (nbytes + byte8_count * 3); | |
804 | ||
805 | src = XSTRING (string)->data; | |
806 | src_end = src + nbytes; | |
807 | dst = XSTRING (val)->data; | |
808 | if (multibyte) | |
809 | while (src < src_end) | |
810 | { | |
811 | c = *src; | |
812 | len = BYTES_BY_CHAR_HEAD (c); | |
813 | ||
814 | if (CHAR_BYTE8_HEAD_P (c)) | |
815 | { | |
816 | c = STRING_CHAR_ADVANCE (src); | |
817 | c = CHAR_TO_BYTE8 (c); | |
818 | sprintf (dst, "\\%03o", c); | |
819 | dst += 4; | |
820 | } | |
821 | else | |
822 | while (len--) *dst++ = *src++; | |
823 | } | |
824 | else | |
825 | while (src < src_end) | |
826 | { | |
827 | c = *src++; | |
828 | if (c >= 0x80) | |
829 | { | |
830 | sprintf (dst, "\\%03o", c); | |
831 | dst += 4; | |
832 | } | |
833 | else | |
834 | *dst++ = c; | |
835 | } | |
836 | return val; | |
837 | } | |
838 | ||
839 | \f | |
840 | DEFUN ("string", Fstring, Sstring, 1, MANY, 0, | |
841 | doc: /* | |
842 | Concatenate all the argument characters and make the result a string. */) | |
843 | (n, args) | |
844 | int n; | |
845 | Lisp_Object *args; | |
846 | { | |
847 | int i; | |
848 | unsigned char *buf = (unsigned char *) alloca (MAX_MULTIBYTE_LENGTH * n); | |
849 | unsigned char *p = buf; | |
850 | int c; | |
851 | ||
852 | for (i = 0; i < n; i++) | |
853 | { | |
854 | CHECK_CHARACTER (args[i]); | |
855 | c = XINT (args[i]); | |
856 | p += CHAR_STRING (c, p); | |
857 | } | |
858 | ||
859 | return make_string_from_bytes ((char *) buf, n, p - buf); | |
860 | } | |
861 | ||
862 | void | |
863 | init_character_once () | |
864 | { | |
865 | } | |
866 | ||
867 | #ifdef emacs | |
868 | ||
869 | void | |
870 | syms_of_character () | |
871 | { | |
872 | DEFSYM (Qcharacterp, "characterp"); | |
873 | DEFSYM (Qauto_fill_chars, "auto-fill-chars"); | |
874 | ||
875 | staticpro (&Vchar_unify_table); | |
876 | Vchar_unify_table = Qnil; | |
877 | ||
878 | defsubr (&Smax_char); | |
879 | defsubr (&Scharacterp); | |
880 | defsubr (&Sunibyte_char_to_multibyte); | |
881 | defsubr (&Smultibyte_char_to_unibyte); | |
882 | defsubr (&Schar_bytes); | |
883 | defsubr (&Schar_width); | |
884 | defsubr (&Sstring_width); | |
885 | defsubr (&Schar_direction); | |
886 | defsubr (&Schars_in_region); | |
887 | defsubr (&Sstring); | |
888 | ||
889 | DEFVAR_LISP ("translation-table-vector", &Vtranslation_table_vector, | |
890 | doc: /* | |
891 | Vector of cons cell of a symbol and translation table ever defined. | |
892 | An ID of a translation table is an index of this vector. */); | |
893 | Vtranslation_table_vector = Fmake_vector (make_number (16), Qnil); | |
894 | ||
895 | DEFVAR_LISP ("auto-fill-chars", &Vauto_fill_chars, | |
896 | doc: /* | |
897 | A char-table for characters which invoke auto-filling. | |
898 | Such characters have value t in this table. */); | |
899 | Vauto_fill_chars = Fmake_char_table (Qauto_fill_chars, Qnil); | |
900 | CHAR_TABLE_SET (Vauto_fill_chars, make_number (' '), Qt); | |
901 | CHAR_TABLE_SET (Vauto_fill_chars, make_number ('\n'), Qt); | |
902 | ||
903 | DEFVAR_LISP ("char-width-table", &Vchar_width_table, | |
904 | doc: /* | |
905 | A char-table for width (columns) of each character. */); | |
906 | Vchar_width_table = Fmake_char_table (Qnil, make_number (1)); | |
907 | ||
908 | DEFVAR_LISP ("char-direction-table", &Vchar_direction_table, | |
909 | doc: /* A char-table for direction of each character. */); | |
910 | Vchar_direction_table = Fmake_char_table (Qnil, make_number (1)); | |
911 | ||
912 | DEFVAR_LISP ("printable-chars", &Vprintable_chars, | |
913 | doc: /* A char-table for each printable character. */); | |
914 | Vprintable_chars = Fmake_char_table (Qnil, Qt); | |
915 | } | |
916 | ||
917 | #endif /* emacs */ |