Commit | Line | Data |
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e318085a RS |
1 | /* Extended regular expression matching and search library, version |
2 | 0.12. (Implements POSIX draft P10003.2/D11.2, except for | |
bc78d348 KB |
3 | internationalization features.) |
4 | ||
505bde11 | 5 | Copyright (C) 1993,94,95,96,97,98,2000 Free Software Foundation, Inc. |
bc78d348 | 6 | |
fa9a63c5 RM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25fe55af | 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
fa9a63c5 RM |
15 | GNU General Public License for more details. |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
ba4a8e51 | 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
25fe55af | 20 | USA. */ |
fa9a63c5 | 21 | |
505bde11 | 22 | /* TODO: |
1fb352e0 | 23 | - use analyze_first to optimize non-empty loops |
1fb352e0 | 24 | - clean up multibyte issues |
505bde11 SM |
25 | - structure the opcode space into opcode+flag. |
26 | - merge with glic's regex.[ch] | |
27 | ||
28 | That's it for now -sm */ | |
29 | ||
fa9a63c5 RM |
30 | /* AIX requires this to be the first thing in the file. */ |
31 | #if defined (_AIX) && !defined (REGEX_MALLOC) | |
32 | #pragma alloca | |
33 | #endif | |
34 | ||
68d96f02 | 35 | #undef _GNU_SOURCE |
fa9a63c5 RM |
36 | #define _GNU_SOURCE |
37 | ||
51352796 | 38 | #ifdef emacs |
25fe55af | 39 | /* Converts the pointer to the char to BEG-based offset from the start. */ |
99633e97 | 40 | #define PTR_TO_OFFSET(d) POS_AS_IN_BUFFER (POINTER_TO_OFFSET (d)) |
7e95234e | 41 | #define POS_AS_IN_BUFFER(p) ((p) + (NILP (re_match_object) || BUFFERP (re_match_object))) |
51352796 RS |
42 | #else |
43 | #define PTR_TO_OFFSET(d) 0 | |
44 | #endif | |
b18215fc | 45 | |
fa9a63c5 RM |
46 | #ifdef HAVE_CONFIG_H |
47 | #include <config.h> | |
48 | #endif | |
49 | ||
25fe55af | 50 | /* We need this for `regex.h', and perhaps for the Emacs include files. */ |
fa9a63c5 RM |
51 | #include <sys/types.h> |
52 | ||
25fe55af | 53 | /* This is for other GNU distributions with internationalized messages. */ |
fa9a63c5 RM |
54 | #if HAVE_LIBINTL_H || defined (_LIBC) |
55 | # include <libintl.h> | |
56 | #else | |
57 | # define gettext(msgid) (msgid) | |
58 | #endif | |
59 | ||
5e69f11e RM |
60 | #ifndef gettext_noop |
61 | /* This define is so xgettext can find the internationalizable | |
62 | strings. */ | |
63 | #define gettext_noop(String) String | |
64 | #endif | |
65 | ||
fa9a63c5 RM |
66 | /* The `emacs' switch turns on certain matching commands |
67 | that make sense only in Emacs. */ | |
68 | #ifdef emacs | |
69 | ||
70 | #include "lisp.h" | |
71 | #include "buffer.h" | |
b18215fc RS |
72 | |
73 | /* Make syntax table lookup grant data in gl_state. */ | |
74 | #define SYNTAX_ENTRY_VIA_PROPERTY | |
75 | ||
fa9a63c5 | 76 | #include "syntax.h" |
b18215fc RS |
77 | #include "charset.h" |
78 | #include "category.h" | |
fa9a63c5 | 79 | |
9abbd165 | 80 | #define malloc xmalloc |
64e3c718 | 81 | #define realloc xrealloc |
9abbd165 RS |
82 | #define free xfree |
83 | ||
4e8a9132 SM |
84 | #define RE_STRING_CHAR(p, s) \ |
85 | (multibyte ? (STRING_CHAR (p, s)) : (*(p))) | |
86 | ||
fa9a63c5 RM |
87 | #else /* not emacs */ |
88 | ||
89 | /* If we are not linking with Emacs proper, | |
90 | we can't use the relocating allocator | |
91 | even if config.h says that we can. */ | |
92 | #undef REL_ALLOC | |
93 | ||
94 | #if defined (STDC_HEADERS) || defined (_LIBC) | |
95 | #include <stdlib.h> | |
96 | #else | |
97 | char *malloc (); | |
98 | char *realloc (); | |
99 | #endif | |
100 | ||
9e4ecb26 | 101 | /* When used in Emacs's lib-src, we need to get bzero and bcopy somehow. |
25fe55af | 102 | If nothing else has been done, use the method below. */ |
9e4ecb26 KH |
103 | #ifdef INHIBIT_STRING_HEADER |
104 | #if !(defined (HAVE_BZERO) && defined (HAVE_BCOPY)) | |
105 | #if !defined (bzero) && !defined (bcopy) | |
106 | #undef INHIBIT_STRING_HEADER | |
107 | #endif | |
108 | #endif | |
109 | #endif | |
110 | ||
111 | /* This is the normal way of making sure we have a bcopy and a bzero. | |
112 | This is used in most programs--a few other programs avoid this | |
113 | by defining INHIBIT_STRING_HEADER. */ | |
fa9a63c5 | 114 | #ifndef INHIBIT_STRING_HEADER |
7f998252 | 115 | #if defined (HAVE_STRING_H) || defined (STDC_HEADERS) || defined (_LIBC) |
fa9a63c5 RM |
116 | #include <string.h> |
117 | #ifndef bcmp | |
118 | #define bcmp(s1, s2, n) memcmp ((s1), (s2), (n)) | |
119 | #endif | |
120 | #ifndef bcopy | |
121 | #define bcopy(s, d, n) memcpy ((d), (s), (n)) | |
122 | #endif | |
123 | #ifndef bzero | |
124 | #define bzero(s, n) memset ((s), 0, (n)) | |
125 | #endif | |
126 | #else | |
127 | #include <strings.h> | |
128 | #endif | |
129 | #endif | |
130 | ||
131 | /* Define the syntax stuff for \<, \>, etc. */ | |
132 | ||
990b2375 SM |
133 | /* Sword must be nonzero for the wordchar pattern commands in re_match_2. */ |
134 | enum syntaxcode { Swhitespace = 0, Sword = 1 }; | |
fa9a63c5 RM |
135 | |
136 | #ifdef SWITCH_ENUM_BUG | |
137 | #define SWITCH_ENUM_CAST(x) ((int)(x)) | |
138 | #else | |
139 | #define SWITCH_ENUM_CAST(x) (x) | |
140 | #endif | |
141 | ||
142 | #ifdef SYNTAX_TABLE | |
143 | ||
144 | extern char *re_syntax_table; | |
145 | ||
146 | #else /* not SYNTAX_TABLE */ | |
147 | ||
148 | /* How many characters in the character set. */ | |
149 | #define CHAR_SET_SIZE 256 | |
150 | ||
151 | static char re_syntax_table[CHAR_SET_SIZE]; | |
152 | ||
153 | static void | |
154 | init_syntax_once () | |
155 | { | |
156 | register int c; | |
157 | static int done = 0; | |
158 | ||
159 | if (done) | |
160 | return; | |
161 | ||
162 | bzero (re_syntax_table, sizeof re_syntax_table); | |
163 | ||
164 | for (c = 'a'; c <= 'z'; c++) | |
165 | re_syntax_table[c] = Sword; | |
166 | ||
167 | for (c = 'A'; c <= 'Z'; c++) | |
168 | re_syntax_table[c] = Sword; | |
169 | ||
170 | for (c = '0'; c <= '9'; c++) | |
171 | re_syntax_table[c] = Sword; | |
172 | ||
173 | re_syntax_table['_'] = Sword; | |
174 | ||
175 | done = 1; | |
176 | } | |
177 | ||
178 | #endif /* not SYNTAX_TABLE */ | |
179 | ||
180 | #define SYNTAX(c) re_syntax_table[c] | |
181 | ||
e934739e | 182 | /* Dummy macros for non-Emacs environments. */ |
b18215fc | 183 | #define BASE_LEADING_CODE_P(c) (0) |
1fb352e0 SM |
184 | #define CHAR_CHARSET(c) 0 |
185 | #define CHARSET_LEADING_CODE_BASE(c) 0 | |
b18215fc RS |
186 | #define WORD_BOUNDARY_P(c1, c2) (0) |
187 | #define CHAR_HEAD_P(p) (1) | |
188 | #define SINGLE_BYTE_CHAR_P(c) (1) | |
189 | #define SAME_CHARSET_P(c1, c2) (1) | |
190 | #define MULTIBYTE_FORM_LENGTH(p, s) (1) | |
191 | #define STRING_CHAR(p, s) (*(p)) | |
4e8a9132 | 192 | #define RE_STRING_CHAR STRING_CHAR |
b18215fc | 193 | #define STRING_CHAR_AND_LENGTH(p, s, actual_len) ((actual_len) = 1, *(p)) |
b18215fc RS |
194 | #define GET_CHAR_BEFORE_2(c, p, str1, end1, str2, end2) \ |
195 | (c = ((p) == (str2) ? *((end1) - 1) : *((p) - 1))) | |
fa9a63c5 | 196 | #endif /* not emacs */ |
4e8a9132 SM |
197 | |
198 | #ifndef RE_TRANSLATE | |
199 | #define RE_TRANSLATE(TBL, C) ((unsigned char)(TBL)[C]) | |
200 | #define RE_TRANSLATE_P(TBL) (TBL) | |
201 | #endif | |
fa9a63c5 RM |
202 | \f |
203 | /* Get the interface, including the syntax bits. */ | |
204 | #include "regex.h" | |
205 | ||
f71b19b6 DL |
206 | /* isalpha etc. are used for the character classes. */ |
207 | #include <ctype.h> | |
fa9a63c5 | 208 | |
f71b19b6 | 209 | #ifdef emacs |
fa9a63c5 | 210 | |
f71b19b6 DL |
211 | /* 1 if C is an ASCII character. */ |
212 | #define IS_REAL_ASCII(c) ((c) < 0200) | |
fa9a63c5 | 213 | |
f71b19b6 DL |
214 | /* 1 if C is a unibyte character. */ |
215 | #define ISUNIBYTE(c) (SINGLE_BYTE_CHAR_P ((c))) | |
96cc36cc | 216 | |
f71b19b6 | 217 | /* The Emacs definitions should not be directly affected by locales. */ |
96cc36cc | 218 | |
f71b19b6 DL |
219 | /* In Emacs, these are only used for single-byte characters. */ |
220 | #define ISDIGIT(c) ((c) >= '0' && (c) <= '9') | |
221 | #define ISCNTRL(c) ((c) < ' ') | |
222 | #define ISXDIGIT(c) (((c) >= '0' && (c) <= '9') \ | |
223 | || ((c) >= 'a' && (c) <= 'f') \ | |
224 | || ((c) >= 'A' && (c) <= 'F')) | |
96cc36cc RS |
225 | |
226 | /* This is only used for single-byte characters. */ | |
227 | #define ISBLANK(c) ((c) == ' ' || (c) == '\t') | |
228 | ||
229 | /* The rest must handle multibyte characters. */ | |
230 | ||
231 | #define ISGRAPH(c) (SINGLE_BYTE_CHAR_P (c) \ | |
f71b19b6 | 232 | ? (c) > ' ' && !((c) >= 0177 && (c) <= 0237) \ |
96cc36cc RS |
233 | : 1) |
234 | ||
235 | #define ISPRINT(c) (SINGLE_BYTE_CHAR_P (c) \ | |
f71b19b6 | 236 | ? (c) >= ' ' && !((c) >= 0177 && (c) <= 0237) \ |
96cc36cc RS |
237 | : 1) |
238 | ||
f71b19b6 DL |
239 | #define ISALNUM(c) (IS_REAL_ASCII (c) \ |
240 | ? (((c) >= 'a' && (c) <= 'z') \ | |
241 | || ((c) >= 'A' && (c) <= 'Z') \ | |
242 | || ((c) >= '0' && (c) <= '9')) \ | |
96cc36cc RS |
243 | : SYNTAX (c) == Sword) |
244 | ||
f71b19b6 DL |
245 | #define ISALPHA(c) (IS_REAL_ASCII (c) \ |
246 | ? (((c) >= 'a' && (c) <= 'z') \ | |
247 | || ((c) >= 'A' && (c) <= 'Z')) \ | |
96cc36cc RS |
248 | : SYNTAX (c) == Sword) |
249 | ||
250 | #define ISLOWER(c) (LOWERCASEP (c)) | |
251 | ||
f71b19b6 DL |
252 | #define ISPUNCT(c) (IS_REAL_ASCII (c) \ |
253 | ? ((c) > ' ' && (c) < 0177 \ | |
254 | && !(((c) >= 'a' && (c) <= 'z') \ | |
255 | || ((c) >= 'A' && (c) <= 'Z') \ | |
256 | || ((c) >= '0' && (c) <= '9'))) \ | |
96cc36cc RS |
257 | : SYNTAX (c) != Sword) |
258 | ||
259 | #define ISSPACE(c) (SYNTAX (c) == Swhitespace) | |
260 | ||
261 | #define ISUPPER(c) (UPPERCASEP (c)) | |
262 | ||
263 | #define ISWORD(c) (SYNTAX (c) == Sword) | |
264 | ||
265 | #else /* not emacs */ | |
266 | ||
f71b19b6 DL |
267 | /* Jim Meyering writes: |
268 | ||
269 | "... Some ctype macros are valid only for character codes that | |
270 | isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when | |
271 | using /bin/cc or gcc but without giving an ansi option). So, all | |
272 | ctype uses should be through macros like ISPRINT... If | |
273 | STDC_HEADERS is defined, then autoconf has verified that the ctype | |
274 | macros don't need to be guarded with references to isascii. ... | |
275 | Defining isascii to 1 should let any compiler worth its salt | |
276 | eliminate the && through constant folding." */ | |
277 | ||
278 | #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) | |
279 | #define ISASCII(c) 1 | |
280 | #else | |
281 | #define ISASCII(c) isascii(c) | |
282 | #endif | |
283 | ||
284 | /* 1 if C is an ASCII character. */ | |
285 | #define IS_REAL_ASCII(c) ((c) < 0200) | |
286 | ||
287 | /* This distinction is not meaningful, except in Emacs. */ | |
288 | #define ISUNIBYTE(c) 1 | |
289 | ||
290 | #define ISDIGIT(c) (ISASCII (c) && isdigit (c)) | |
291 | #define ISCNTRL(c) (ISASCII (c) && iscntrl (c)) | |
292 | #define ISXDIGIT(c) (ISASCII (c) && isxdigit (c)) | |
293 | ||
fa9a63c5 RM |
294 | #ifdef isblank |
295 | #define ISBLANK(c) (ISASCII (c) && isblank (c)) | |
296 | #else | |
297 | #define ISBLANK(c) ((c) == ' ' || (c) == '\t') | |
298 | #endif | |
299 | #ifdef isgraph | |
300 | #define ISGRAPH(c) (ISASCII (c) && isgraph (c)) | |
301 | #else | |
302 | #define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c)) | |
303 | #endif | |
304 | ||
305 | #define ISPRINT(c) (ISASCII (c) && isprint (c)) | |
306 | #define ISDIGIT(c) (ISASCII (c) && isdigit (c)) | |
307 | #define ISALNUM(c) (ISASCII (c) && isalnum (c)) | |
308 | #define ISALPHA(c) (ISASCII (c) && isalpha (c)) | |
309 | #define ISCNTRL(c) (ISASCII (c) && iscntrl (c)) | |
310 | #define ISLOWER(c) (ISASCII (c) && islower (c)) | |
311 | #define ISPUNCT(c) (ISASCII (c) && ispunct (c)) | |
312 | #define ISSPACE(c) (ISASCII (c) && isspace (c)) | |
313 | #define ISUPPER(c) (ISASCII (c) && isupper (c)) | |
314 | #define ISXDIGIT(c) (ISASCII (c) && isxdigit (c)) | |
315 | ||
96cc36cc RS |
316 | #define ISWORD(c) ISALPHA(c) |
317 | ||
318 | #endif /* not emacs */ | |
319 | \f | |
fa9a63c5 | 320 | #ifndef NULL |
075f06ec | 321 | #define NULL (void *)0 |
fa9a63c5 RM |
322 | #endif |
323 | ||
324 | /* We remove any previous definition of `SIGN_EXTEND_CHAR', | |
325 | since ours (we hope) works properly with all combinations of | |
326 | machines, compilers, `char' and `unsigned char' argument types. | |
25fe55af | 327 | (Per Bothner suggested the basic approach.) */ |
fa9a63c5 RM |
328 | #undef SIGN_EXTEND_CHAR |
329 | #if __STDC__ | |
330 | #define SIGN_EXTEND_CHAR(c) ((signed char) (c)) | |
331 | #else /* not __STDC__ */ | |
332 | /* As in Harbison and Steele. */ | |
333 | #define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128) | |
334 | #endif | |
335 | \f | |
336 | /* Should we use malloc or alloca? If REGEX_MALLOC is not defined, we | |
337 | use `alloca' instead of `malloc'. This is because using malloc in | |
338 | re_search* or re_match* could cause memory leaks when C-g is used in | |
339 | Emacs; also, malloc is slower and causes storage fragmentation. On | |
5e69f11e RM |
340 | the other hand, malloc is more portable, and easier to debug. |
341 | ||
fa9a63c5 RM |
342 | Because we sometimes use alloca, some routines have to be macros, |
343 | not functions -- `alloca'-allocated space disappears at the end of the | |
344 | function it is called in. */ | |
345 | ||
346 | #ifdef REGEX_MALLOC | |
347 | ||
348 | #define REGEX_ALLOCATE malloc | |
349 | #define REGEX_REALLOCATE(source, osize, nsize) realloc (source, nsize) | |
350 | #define REGEX_FREE free | |
351 | ||
352 | #else /* not REGEX_MALLOC */ | |
353 | ||
354 | /* Emacs already defines alloca, sometimes. */ | |
355 | #ifndef alloca | |
356 | ||
357 | /* Make alloca work the best possible way. */ | |
358 | #ifdef __GNUC__ | |
359 | #define alloca __builtin_alloca | |
360 | #else /* not __GNUC__ */ | |
361 | #if HAVE_ALLOCA_H | |
362 | #include <alloca.h> | |
363 | #else /* not __GNUC__ or HAVE_ALLOCA_H */ | |
f3c4387f | 364 | #if 0 /* It is a bad idea to declare alloca. We always cast the result. */ |
25fe55af | 365 | #ifndef _AIX /* Already did AIX, up at the top. */ |
fa9a63c5 RM |
366 | char *alloca (); |
367 | #endif /* not _AIX */ | |
f3c4387f | 368 | #endif |
5e69f11e | 369 | #endif /* not HAVE_ALLOCA_H */ |
fa9a63c5 RM |
370 | #endif /* not __GNUC__ */ |
371 | ||
372 | #endif /* not alloca */ | |
373 | ||
374 | #define REGEX_ALLOCATE alloca | |
375 | ||
376 | /* Assumes a `char *destination' variable. */ | |
377 | #define REGEX_REALLOCATE(source, osize, nsize) \ | |
378 | (destination = (char *) alloca (nsize), \ | |
379 | bcopy (source, destination, osize), \ | |
380 | destination) | |
381 | ||
382 | /* No need to do anything to free, after alloca. */ | |
c2e1680a | 383 | #define REGEX_FREE(arg) ((void)0) /* Do nothing! But inhibit gcc warning. */ |
fa9a63c5 RM |
384 | |
385 | #endif /* not REGEX_MALLOC */ | |
386 | ||
387 | /* Define how to allocate the failure stack. */ | |
388 | ||
33487cc8 | 389 | #if defined (REL_ALLOC) && defined (REGEX_MALLOC) |
4297555e | 390 | |
fa9a63c5 RM |
391 | #define REGEX_ALLOCATE_STACK(size) \ |
392 | r_alloc (&failure_stack_ptr, (size)) | |
393 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) \ | |
394 | r_re_alloc (&failure_stack_ptr, (nsize)) | |
395 | #define REGEX_FREE_STACK(ptr) \ | |
396 | r_alloc_free (&failure_stack_ptr) | |
397 | ||
4297555e | 398 | #else /* not using relocating allocator */ |
fa9a63c5 RM |
399 | |
400 | #ifdef REGEX_MALLOC | |
401 | ||
402 | #define REGEX_ALLOCATE_STACK malloc | |
403 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) realloc (source, nsize) | |
404 | #define REGEX_FREE_STACK free | |
405 | ||
406 | #else /* not REGEX_MALLOC */ | |
407 | ||
408 | #define REGEX_ALLOCATE_STACK alloca | |
409 | ||
410 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) \ | |
411 | REGEX_REALLOCATE (source, osize, nsize) | |
25fe55af | 412 | /* No need to explicitly free anything. */ |
ed0767d8 | 413 | #define REGEX_FREE_STACK(arg) ((void)0) |
fa9a63c5 RM |
414 | |
415 | #endif /* not REGEX_MALLOC */ | |
4297555e | 416 | #endif /* not using relocating allocator */ |
fa9a63c5 RM |
417 | |
418 | ||
419 | /* True if `size1' is non-NULL and PTR is pointing anywhere inside | |
420 | `string1' or just past its end. This works if PTR is NULL, which is | |
421 | a good thing. */ | |
25fe55af | 422 | #define FIRST_STRING_P(ptr) \ |
fa9a63c5 RM |
423 | (size1 && string1 <= (ptr) && (ptr) <= string1 + size1) |
424 | ||
425 | /* (Re)Allocate N items of type T using malloc, or fail. */ | |
426 | #define TALLOC(n, t) ((t *) malloc ((n) * sizeof (t))) | |
427 | #define RETALLOC(addr, n, t) ((addr) = (t *) realloc (addr, (n) * sizeof (t))) | |
428 | #define RETALLOC_IF(addr, n, t) \ | |
429 | if (addr) RETALLOC((addr), (n), t); else (addr) = TALLOC ((n), t) | |
430 | #define REGEX_TALLOC(n, t) ((t *) REGEX_ALLOCATE ((n) * sizeof (t))) | |
431 | ||
25fe55af | 432 | #define BYTEWIDTH 8 /* In bits. */ |
fa9a63c5 RM |
433 | |
434 | #define STREQ(s1, s2) ((strcmp (s1, s2) == 0)) | |
435 | ||
436 | #undef MAX | |
437 | #undef MIN | |
438 | #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
439 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
440 | ||
66f0296e SM |
441 | /* Type of source-pattern and string chars. */ |
442 | typedef const unsigned char re_char; | |
443 | ||
fa9a63c5 RM |
444 | typedef char boolean; |
445 | #define false 0 | |
446 | #define true 1 | |
447 | ||
448 | static int re_match_2_internal (); | |
449 | \f | |
450 | /* These are the command codes that appear in compiled regular | |
25fe55af | 451 | expressions. Some opcodes are followed by argument bytes. A |
fa9a63c5 RM |
452 | command code can specify any interpretation whatsoever for its |
453 | arguments. Zero bytes may appear in the compiled regular expression. */ | |
454 | ||
455 | typedef enum | |
456 | { | |
457 | no_op = 0, | |
458 | ||
25fe55af | 459 | /* Succeed right away--no more backtracking. */ |
fa9a63c5 RM |
460 | succeed, |
461 | ||
25fe55af | 462 | /* Followed by one byte giving n, then by n literal bytes. */ |
fa9a63c5 RM |
463 | exactn, |
464 | ||
25fe55af | 465 | /* Matches any (more or less) character. */ |
fa9a63c5 RM |
466 | anychar, |
467 | ||
25fe55af RS |
468 | /* Matches any one char belonging to specified set. First |
469 | following byte is number of bitmap bytes. Then come bytes | |
470 | for a bitmap saying which chars are in. Bits in each byte | |
471 | are ordered low-bit-first. A character is in the set if its | |
472 | bit is 1. A character too large to have a bit in the map is | |
96cc36cc RS |
473 | automatically not in the set. |
474 | ||
475 | If the length byte has the 0x80 bit set, then that stuff | |
476 | is followed by a range table: | |
477 | 2 bytes of flags for character sets (low 8 bits, high 8 bits) | |
478 | See RANGE_TABLE_WORK_BITS below. | |
479 | 2 bytes, the number of pairs that follow | |
480 | pairs, each 2 multibyte characters, | |
481 | each multibyte character represented as 3 bytes. */ | |
fa9a63c5 RM |
482 | charset, |
483 | ||
25fe55af RS |
484 | /* Same parameters as charset, but match any character that is |
485 | not one of those specified. */ | |
fa9a63c5 RM |
486 | charset_not, |
487 | ||
25fe55af RS |
488 | /* Start remembering the text that is matched, for storing in a |
489 | register. Followed by one byte with the register number, in | |
490 | the range 0 to one less than the pattern buffer's re_nsub | |
505bde11 | 491 | field. */ |
fa9a63c5 RM |
492 | start_memory, |
493 | ||
25fe55af RS |
494 | /* Stop remembering the text that is matched and store it in a |
495 | memory register. Followed by one byte with the register | |
496 | number, in the range 0 to one less than `re_nsub' in the | |
505bde11 | 497 | pattern buffer. */ |
fa9a63c5 RM |
498 | stop_memory, |
499 | ||
25fe55af RS |
500 | /* Match a duplicate of something remembered. Followed by one |
501 | byte containing the register number. */ | |
fa9a63c5 RM |
502 | duplicate, |
503 | ||
25fe55af | 504 | /* Fail unless at beginning of line. */ |
fa9a63c5 RM |
505 | begline, |
506 | ||
25fe55af | 507 | /* Fail unless at end of line. */ |
fa9a63c5 RM |
508 | endline, |
509 | ||
25fe55af RS |
510 | /* Succeeds if at beginning of buffer (if emacs) or at beginning |
511 | of string to be matched (if not). */ | |
fa9a63c5 RM |
512 | begbuf, |
513 | ||
25fe55af | 514 | /* Analogously, for end of buffer/string. */ |
fa9a63c5 | 515 | endbuf, |
5e69f11e | 516 | |
25fe55af | 517 | /* Followed by two byte relative address to which to jump. */ |
5e69f11e | 518 | jump, |
fa9a63c5 | 519 | |
25fe55af RS |
520 | /* Followed by two-byte relative address of place to resume at |
521 | in case of failure. */ | |
fa9a63c5 | 522 | on_failure_jump, |
5e69f11e | 523 | |
25fe55af RS |
524 | /* Like on_failure_jump, but pushes a placeholder instead of the |
525 | current string position when executed. */ | |
fa9a63c5 | 526 | on_failure_keep_string_jump, |
5e69f11e | 527 | |
505bde11 SM |
528 | /* Just like `on_failure_jump', except that it checks that we |
529 | don't get stuck in an infinite loop (matching an empty string | |
530 | indefinitely). */ | |
531 | on_failure_jump_loop, | |
532 | ||
0683b6fa SM |
533 | /* Just like `on_failure_jump_loop', except that it checks for |
534 | a different kind of loop (the kind that shows up with non-greedy | |
535 | operators). This operation has to be immediately preceded | |
536 | by a `no_op'. */ | |
537 | on_failure_jump_nastyloop, | |
538 | ||
505bde11 SM |
539 | /* A smart `on_failure_jump' used for greedy * and + operators. |
540 | It analyses the loop before which it is put and if the | |
541 | loop does not require backtracking, it changes itself to | |
4e8a9132 SM |
542 | `on_failure_keep_string_jump' and short-circuits the loop, |
543 | else it just defaults to changing itself into `on_failure_jump'. | |
544 | It assumes that it is pointing to just past a `jump'. */ | |
505bde11 | 545 | on_failure_jump_smart, |
fa9a63c5 | 546 | |
25fe55af | 547 | /* Followed by two-byte relative address and two-byte number n. |
ed0767d8 SM |
548 | After matching N times, jump to the address upon failure. |
549 | Does not work if N starts at 0: use on_failure_jump_loop | |
550 | instead. */ | |
fa9a63c5 RM |
551 | succeed_n, |
552 | ||
25fe55af RS |
553 | /* Followed by two-byte relative address, and two-byte number n. |
554 | Jump to the address N times, then fail. */ | |
fa9a63c5 RM |
555 | jump_n, |
556 | ||
25fe55af RS |
557 | /* Set the following two-byte relative address to the |
558 | subsequent two-byte number. The address *includes* the two | |
559 | bytes of number. */ | |
fa9a63c5 RM |
560 | set_number_at, |
561 | ||
fa9a63c5 RM |
562 | wordbeg, /* Succeeds if at word beginning. */ |
563 | wordend, /* Succeeds if at word end. */ | |
564 | ||
565 | wordbound, /* Succeeds if at a word boundary. */ | |
1fb352e0 | 566 | notwordbound, /* Succeeds if not at a word boundary. */ |
fa9a63c5 RM |
567 | |
568 | /* Matches any character whose syntax is specified. Followed by | |
25fe55af | 569 | a byte which contains a syntax code, e.g., Sword. */ |
fa9a63c5 RM |
570 | syntaxspec, |
571 | ||
572 | /* Matches any character whose syntax is not that specified. */ | |
1fb352e0 SM |
573 | notsyntaxspec |
574 | ||
575 | #ifdef emacs | |
576 | ,before_dot, /* Succeeds if before point. */ | |
577 | at_dot, /* Succeeds if at point. */ | |
578 | after_dot, /* Succeeds if after point. */ | |
b18215fc RS |
579 | |
580 | /* Matches any character whose category-set contains the specified | |
25fe55af RS |
581 | category. The operator is followed by a byte which contains a |
582 | category code (mnemonic ASCII character). */ | |
b18215fc RS |
583 | categoryspec, |
584 | ||
585 | /* Matches any character whose category-set does not contain the | |
586 | specified category. The operator is followed by a byte which | |
587 | contains the category code (mnemonic ASCII character). */ | |
588 | notcategoryspec | |
fa9a63c5 RM |
589 | #endif /* emacs */ |
590 | } re_opcode_t; | |
591 | \f | |
592 | /* Common operations on the compiled pattern. */ | |
593 | ||
594 | /* Store NUMBER in two contiguous bytes starting at DESTINATION. */ | |
595 | ||
596 | #define STORE_NUMBER(destination, number) \ | |
597 | do { \ | |
598 | (destination)[0] = (number) & 0377; \ | |
599 | (destination)[1] = (number) >> 8; \ | |
600 | } while (0) | |
601 | ||
602 | /* Same as STORE_NUMBER, except increment DESTINATION to | |
603 | the byte after where the number is stored. Therefore, DESTINATION | |
604 | must be an lvalue. */ | |
605 | ||
606 | #define STORE_NUMBER_AND_INCR(destination, number) \ | |
607 | do { \ | |
608 | STORE_NUMBER (destination, number); \ | |
609 | (destination) += 2; \ | |
610 | } while (0) | |
611 | ||
612 | /* Put into DESTINATION a number stored in two contiguous bytes starting | |
613 | at SOURCE. */ | |
614 | ||
615 | #define EXTRACT_NUMBER(destination, source) \ | |
616 | do { \ | |
617 | (destination) = *(source) & 0377; \ | |
618 | (destination) += SIGN_EXTEND_CHAR (*((source) + 1)) << 8; \ | |
619 | } while (0) | |
620 | ||
621 | #ifdef DEBUG | |
622 | static void | |
623 | extract_number (dest, source) | |
624 | int *dest; | |
625 | unsigned char *source; | |
626 | { | |
5e69f11e | 627 | int temp = SIGN_EXTEND_CHAR (*(source + 1)); |
fa9a63c5 RM |
628 | *dest = *source & 0377; |
629 | *dest += temp << 8; | |
630 | } | |
631 | ||
25fe55af | 632 | #ifndef EXTRACT_MACROS /* To debug the macros. */ |
fa9a63c5 RM |
633 | #undef EXTRACT_NUMBER |
634 | #define EXTRACT_NUMBER(dest, src) extract_number (&dest, src) | |
635 | #endif /* not EXTRACT_MACROS */ | |
636 | ||
637 | #endif /* DEBUG */ | |
638 | ||
639 | /* Same as EXTRACT_NUMBER, except increment SOURCE to after the number. | |
640 | SOURCE must be an lvalue. */ | |
641 | ||
642 | #define EXTRACT_NUMBER_AND_INCR(destination, source) \ | |
643 | do { \ | |
644 | EXTRACT_NUMBER (destination, source); \ | |
25fe55af | 645 | (source) += 2; \ |
fa9a63c5 RM |
646 | } while (0) |
647 | ||
648 | #ifdef DEBUG | |
649 | static void | |
650 | extract_number_and_incr (destination, source) | |
651 | int *destination; | |
652 | unsigned char **source; | |
5e69f11e | 653 | { |
fa9a63c5 RM |
654 | extract_number (destination, *source); |
655 | *source += 2; | |
656 | } | |
657 | ||
658 | #ifndef EXTRACT_MACROS | |
659 | #undef EXTRACT_NUMBER_AND_INCR | |
660 | #define EXTRACT_NUMBER_AND_INCR(dest, src) \ | |
661 | extract_number_and_incr (&dest, &src) | |
662 | #endif /* not EXTRACT_MACROS */ | |
663 | ||
664 | #endif /* DEBUG */ | |
665 | \f | |
b18215fc RS |
666 | /* Store a multibyte character in three contiguous bytes starting |
667 | DESTINATION, and increment DESTINATION to the byte after where the | |
25fe55af | 668 | character is stored. Therefore, DESTINATION must be an lvalue. */ |
b18215fc RS |
669 | |
670 | #define STORE_CHARACTER_AND_INCR(destination, character) \ | |
671 | do { \ | |
672 | (destination)[0] = (character) & 0377; \ | |
673 | (destination)[1] = ((character) >> 8) & 0377; \ | |
674 | (destination)[2] = (character) >> 16; \ | |
675 | (destination) += 3; \ | |
676 | } while (0) | |
677 | ||
678 | /* Put into DESTINATION a character stored in three contiguous bytes | |
25fe55af | 679 | starting at SOURCE. */ |
b18215fc RS |
680 | |
681 | #define EXTRACT_CHARACTER(destination, source) \ | |
682 | do { \ | |
683 | (destination) = ((source)[0] \ | |
684 | | ((source)[1] << 8) \ | |
685 | | ((source)[2] << 16)); \ | |
686 | } while (0) | |
687 | ||
688 | ||
689 | /* Macros for charset. */ | |
690 | ||
691 | /* Size of bitmap of charset P in bytes. P is a start of charset, | |
692 | i.e. *P is (re_opcode_t) charset or (re_opcode_t) charset_not. */ | |
693 | #define CHARSET_BITMAP_SIZE(p) ((p)[1] & 0x7F) | |
694 | ||
695 | /* Nonzero if charset P has range table. */ | |
25fe55af | 696 | #define CHARSET_RANGE_TABLE_EXISTS_P(p) ((p)[1] & 0x80) |
b18215fc RS |
697 | |
698 | /* Return the address of range table of charset P. But not the start | |
699 | of table itself, but the before where the number of ranges is | |
96cc36cc RS |
700 | stored. `2 +' means to skip re_opcode_t and size of bitmap, |
701 | and the 2 bytes of flags at the start of the range table. */ | |
702 | #define CHARSET_RANGE_TABLE(p) (&(p)[4 + CHARSET_BITMAP_SIZE (p)]) | |
703 | ||
704 | /* Extract the bit flags that start a range table. */ | |
705 | #define CHARSET_RANGE_TABLE_BITS(p) \ | |
706 | ((p)[2 + CHARSET_BITMAP_SIZE (p)] \ | |
707 | + (p)[3 + CHARSET_BITMAP_SIZE (p)] * 0x100) | |
b18215fc RS |
708 | |
709 | /* Test if C is listed in the bitmap of charset P. */ | |
710 | #define CHARSET_LOOKUP_BITMAP(p, c) \ | |
711 | ((c) < CHARSET_BITMAP_SIZE (p) * BYTEWIDTH \ | |
712 | && (p)[2 + (c) / BYTEWIDTH] & (1 << ((c) % BYTEWIDTH))) | |
713 | ||
714 | /* Return the address of end of RANGE_TABLE. COUNT is number of | |
25fe55af RS |
715 | ranges (which is a pair of (start, end)) in the RANGE_TABLE. `* 2' |
716 | is start of range and end of range. `* 3' is size of each start | |
b18215fc RS |
717 | and end. */ |
718 | #define CHARSET_RANGE_TABLE_END(range_table, count) \ | |
719 | ((range_table) + (count) * 2 * 3) | |
720 | ||
25fe55af | 721 | /* Test if C is in RANGE_TABLE. A flag NOT is negated if C is in. |
b18215fc RS |
722 | COUNT is number of ranges in RANGE_TABLE. */ |
723 | #define CHARSET_LOOKUP_RANGE_TABLE_RAW(not, c, range_table, count) \ | |
724 | do \ | |
725 | { \ | |
726 | int range_start, range_end; \ | |
727 | unsigned char *p; \ | |
728 | unsigned char *range_table_end \ | |
729 | = CHARSET_RANGE_TABLE_END ((range_table), (count)); \ | |
730 | \ | |
731 | for (p = (range_table); p < range_table_end; p += 2 * 3) \ | |
732 | { \ | |
733 | EXTRACT_CHARACTER (range_start, p); \ | |
734 | EXTRACT_CHARACTER (range_end, p + 3); \ | |
735 | \ | |
736 | if (range_start <= (c) && (c) <= range_end) \ | |
737 | { \ | |
738 | (not) = !(not); \ | |
739 | break; \ | |
740 | } \ | |
741 | } \ | |
742 | } \ | |
743 | while (0) | |
744 | ||
745 | /* Test if C is in range table of CHARSET. The flag NOT is negated if | |
746 | C is listed in it. */ | |
747 | #define CHARSET_LOOKUP_RANGE_TABLE(not, c, charset) \ | |
748 | do \ | |
749 | { \ | |
750 | /* Number of ranges in range table. */ \ | |
751 | int count; \ | |
752 | unsigned char *range_table = CHARSET_RANGE_TABLE (charset); \ | |
753 | \ | |
754 | EXTRACT_NUMBER_AND_INCR (count, range_table); \ | |
755 | CHARSET_LOOKUP_RANGE_TABLE_RAW ((not), (c), range_table, count); \ | |
756 | } \ | |
757 | while (0) | |
758 | \f | |
fa9a63c5 RM |
759 | /* If DEBUG is defined, Regex prints many voluminous messages about what |
760 | it is doing (if the variable `debug' is nonzero). If linked with the | |
761 | main program in `iregex.c', you can enter patterns and strings | |
762 | interactively. And if linked with the main program in `main.c' and | |
25fe55af | 763 | the other test files, you can run the already-written tests. */ |
fa9a63c5 RM |
764 | |
765 | #ifdef DEBUG | |
766 | ||
767 | /* We use standard I/O for debugging. */ | |
768 | #include <stdio.h> | |
769 | ||
770 | /* It is useful to test things that ``must'' be true when debugging. */ | |
771 | #include <assert.h> | |
772 | ||
99633e97 | 773 | static int debug = -100000; |
fa9a63c5 RM |
774 | |
775 | #define DEBUG_STATEMENT(e) e | |
99633e97 SM |
776 | #define DEBUG_PRINT1(x) if (debug > 0) printf (x) |
777 | #define DEBUG_PRINT2(x1, x2) if (debug > 0) printf (x1, x2) | |
778 | #define DEBUG_PRINT3(x1, x2, x3) if (debug > 0) printf (x1, x2, x3) | |
779 | #define DEBUG_PRINT4(x1, x2, x3, x4) if (debug > 0) printf (x1, x2, x3, x4) | |
25fe55af | 780 | #define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) \ |
99633e97 | 781 | if (debug > 0) print_partial_compiled_pattern (s, e) |
fa9a63c5 | 782 | #define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) \ |
99633e97 | 783 | if (debug > 0) print_double_string (w, s1, sz1, s2, sz2) |
fa9a63c5 RM |
784 | |
785 | ||
786 | /* Print the fastmap in human-readable form. */ | |
787 | ||
788 | void | |
789 | print_fastmap (fastmap) | |
790 | char *fastmap; | |
791 | { | |
792 | unsigned was_a_range = 0; | |
5e69f11e RM |
793 | unsigned i = 0; |
794 | ||
fa9a63c5 RM |
795 | while (i < (1 << BYTEWIDTH)) |
796 | { | |
797 | if (fastmap[i++]) | |
798 | { | |
799 | was_a_range = 0; | |
25fe55af RS |
800 | putchar (i - 1); |
801 | while (i < (1 << BYTEWIDTH) && fastmap[i]) | |
802 | { | |
803 | was_a_range = 1; | |
804 | i++; | |
805 | } | |
fa9a63c5 | 806 | if (was_a_range) |
25fe55af RS |
807 | { |
808 | printf ("-"); | |
809 | putchar (i - 1); | |
810 | } | |
811 | } | |
fa9a63c5 | 812 | } |
5e69f11e | 813 | putchar ('\n'); |
fa9a63c5 RM |
814 | } |
815 | ||
816 | ||
817 | /* Print a compiled pattern string in human-readable form, starting at | |
818 | the START pointer into it and ending just before the pointer END. */ | |
819 | ||
820 | void | |
821 | print_partial_compiled_pattern (start, end) | |
822 | unsigned char *start; | |
823 | unsigned char *end; | |
824 | { | |
825 | int mcnt, mcnt2; | |
826 | unsigned char *p = start; | |
827 | unsigned char *pend = end; | |
828 | ||
829 | if (start == NULL) | |
830 | { | |
831 | printf ("(null)\n"); | |
832 | return; | |
833 | } | |
5e69f11e | 834 | |
fa9a63c5 RM |
835 | /* Loop over pattern commands. */ |
836 | while (p < pend) | |
837 | { | |
838 | printf ("%d:\t", p - start); | |
839 | ||
840 | switch ((re_opcode_t) *p++) | |
841 | { | |
25fe55af RS |
842 | case no_op: |
843 | printf ("/no_op"); | |
844 | break; | |
fa9a63c5 | 845 | |
99633e97 SM |
846 | case succeed: |
847 | printf ("/succeed"); | |
848 | break; | |
849 | ||
fa9a63c5 RM |
850 | case exactn: |
851 | mcnt = *p++; | |
25fe55af RS |
852 | printf ("/exactn/%d", mcnt); |
853 | do | |
fa9a63c5 | 854 | { |
25fe55af | 855 | putchar ('/'); |
fa9a63c5 | 856 | putchar (*p++); |
25fe55af RS |
857 | } |
858 | while (--mcnt); | |
859 | break; | |
fa9a63c5 RM |
860 | |
861 | case start_memory: | |
505bde11 | 862 | printf ("/start_memory/%d", *p++); |
25fe55af | 863 | break; |
fa9a63c5 RM |
864 | |
865 | case stop_memory: | |
505bde11 | 866 | printf ("/stop_memory/%d", *p++); |
25fe55af | 867 | break; |
fa9a63c5 RM |
868 | |
869 | case duplicate: | |
870 | printf ("/duplicate/%d", *p++); | |
871 | break; | |
872 | ||
873 | case anychar: | |
874 | printf ("/anychar"); | |
875 | break; | |
876 | ||
877 | case charset: | |
25fe55af RS |
878 | case charset_not: |
879 | { | |
880 | register int c, last = -100; | |
fa9a63c5 | 881 | register int in_range = 0; |
99633e97 SM |
882 | int length = CHARSET_BITMAP_SIZE (p - 1); |
883 | int has_range_table = CHARSET_RANGE_TABLE_EXISTS_P (p - 1); | |
fa9a63c5 RM |
884 | |
885 | printf ("/charset [%s", | |
25fe55af | 886 | (re_opcode_t) *(p - 1) == charset_not ? "^" : ""); |
5e69f11e | 887 | |
25fe55af | 888 | assert (p + *p < pend); |
fa9a63c5 | 889 | |
25fe55af | 890 | for (c = 0; c < 256; c++) |
96cc36cc | 891 | if (c / 8 < length |
fa9a63c5 RM |
892 | && (p[1 + (c/8)] & (1 << (c % 8)))) |
893 | { | |
894 | /* Are we starting a range? */ | |
895 | if (last + 1 == c && ! in_range) | |
896 | { | |
897 | putchar ('-'); | |
898 | in_range = 1; | |
899 | } | |
900 | /* Have we broken a range? */ | |
901 | else if (last + 1 != c && in_range) | |
96cc36cc | 902 | { |
fa9a63c5 RM |
903 | putchar (last); |
904 | in_range = 0; | |
905 | } | |
5e69f11e | 906 | |
fa9a63c5 RM |
907 | if (! in_range) |
908 | putchar (c); | |
909 | ||
910 | last = c; | |
25fe55af | 911 | } |
fa9a63c5 RM |
912 | |
913 | if (in_range) | |
914 | putchar (last); | |
915 | ||
916 | putchar (']'); | |
917 | ||
99633e97 | 918 | p += 1 + length; |
96cc36cc | 919 | |
96cc36cc | 920 | if (has_range_table) |
99633e97 SM |
921 | { |
922 | int count; | |
923 | printf ("has-range-table"); | |
924 | ||
925 | /* ??? Should print the range table; for now, just skip it. */ | |
926 | p += 2; /* skip range table bits */ | |
927 | EXTRACT_NUMBER_AND_INCR (count, p); | |
928 | p = CHARSET_RANGE_TABLE_END (p, count); | |
929 | } | |
fa9a63c5 RM |
930 | } |
931 | break; | |
932 | ||
933 | case begline: | |
934 | printf ("/begline"); | |
25fe55af | 935 | break; |
fa9a63c5 RM |
936 | |
937 | case endline: | |
25fe55af RS |
938 | printf ("/endline"); |
939 | break; | |
fa9a63c5 RM |
940 | |
941 | case on_failure_jump: | |
25fe55af RS |
942 | extract_number_and_incr (&mcnt, &p); |
943 | printf ("/on_failure_jump to %d", p + mcnt - start); | |
944 | break; | |
fa9a63c5 RM |
945 | |
946 | case on_failure_keep_string_jump: | |
25fe55af RS |
947 | extract_number_and_incr (&mcnt, &p); |
948 | printf ("/on_failure_keep_string_jump to %d", p + mcnt - start); | |
949 | break; | |
fa9a63c5 | 950 | |
0683b6fa SM |
951 | case on_failure_jump_nastyloop: |
952 | extract_number_and_incr (&mcnt, &p); | |
953 | printf ("/on_failure_jump_nastyloop to %d", p + mcnt - start); | |
954 | break; | |
955 | ||
505bde11 | 956 | case on_failure_jump_loop: |
fa9a63c5 | 957 | extract_number_and_incr (&mcnt, &p); |
505bde11 | 958 | printf ("/on_failure_jump_loop to %d", p + mcnt - start); |
5e69f11e RM |
959 | break; |
960 | ||
505bde11 | 961 | case on_failure_jump_smart: |
fa9a63c5 | 962 | extract_number_and_incr (&mcnt, &p); |
505bde11 | 963 | printf ("/on_failure_jump_smart to %d", p + mcnt - start); |
5e69f11e RM |
964 | break; |
965 | ||
25fe55af | 966 | case jump: |
fa9a63c5 | 967 | extract_number_and_incr (&mcnt, &p); |
25fe55af | 968 | printf ("/jump to %d", p + mcnt - start); |
fa9a63c5 RM |
969 | break; |
970 | ||
25fe55af RS |
971 | case succeed_n: |
972 | extract_number_and_incr (&mcnt, &p); | |
973 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 974 | printf ("/succeed_n to %d, %d times", p - 2 + mcnt - start, mcnt2); |
25fe55af | 975 | break; |
5e69f11e | 976 | |
25fe55af RS |
977 | case jump_n: |
978 | extract_number_and_incr (&mcnt, &p); | |
979 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 980 | printf ("/jump_n to %d, %d times", p - 2 + mcnt - start, mcnt2); |
25fe55af | 981 | break; |
5e69f11e | 982 | |
25fe55af RS |
983 | case set_number_at: |
984 | extract_number_and_incr (&mcnt, &p); | |
985 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 986 | printf ("/set_number_at location %d to %d", p - 2 + mcnt - start, mcnt2); |
25fe55af | 987 | break; |
5e69f11e | 988 | |
25fe55af | 989 | case wordbound: |
fa9a63c5 RM |
990 | printf ("/wordbound"); |
991 | break; | |
992 | ||
993 | case notwordbound: | |
994 | printf ("/notwordbound"); | |
25fe55af | 995 | break; |
fa9a63c5 RM |
996 | |
997 | case wordbeg: | |
998 | printf ("/wordbeg"); | |
999 | break; | |
5e69f11e | 1000 | |
fa9a63c5 RM |
1001 | case wordend: |
1002 | printf ("/wordend"); | |
5e69f11e | 1003 | |
1fb352e0 SM |
1004 | case syntaxspec: |
1005 | printf ("/syntaxspec"); | |
1006 | mcnt = *p++; | |
1007 | printf ("/%d", mcnt); | |
1008 | break; | |
1009 | ||
1010 | case notsyntaxspec: | |
1011 | printf ("/notsyntaxspec"); | |
1012 | mcnt = *p++; | |
1013 | printf ("/%d", mcnt); | |
1014 | break; | |
1015 | ||
fa9a63c5 RM |
1016 | #ifdef emacs |
1017 | case before_dot: | |
1018 | printf ("/before_dot"); | |
25fe55af | 1019 | break; |
fa9a63c5 RM |
1020 | |
1021 | case at_dot: | |
1022 | printf ("/at_dot"); | |
25fe55af | 1023 | break; |
fa9a63c5 RM |
1024 | |
1025 | case after_dot: | |
1026 | printf ("/after_dot"); | |
25fe55af | 1027 | break; |
fa9a63c5 | 1028 | |
1fb352e0 SM |
1029 | case categoryspec: |
1030 | printf ("/categoryspec"); | |
fa9a63c5 RM |
1031 | mcnt = *p++; |
1032 | printf ("/%d", mcnt); | |
25fe55af | 1033 | break; |
5e69f11e | 1034 | |
1fb352e0 SM |
1035 | case notcategoryspec: |
1036 | printf ("/notcategoryspec"); | |
fa9a63c5 RM |
1037 | mcnt = *p++; |
1038 | printf ("/%d", mcnt); | |
1039 | break; | |
1040 | #endif /* emacs */ | |
1041 | ||
fa9a63c5 RM |
1042 | case begbuf: |
1043 | printf ("/begbuf"); | |
25fe55af | 1044 | break; |
fa9a63c5 RM |
1045 | |
1046 | case endbuf: | |
1047 | printf ("/endbuf"); | |
25fe55af | 1048 | break; |
fa9a63c5 | 1049 | |
25fe55af RS |
1050 | default: |
1051 | printf ("?%d", *(p-1)); | |
fa9a63c5 RM |
1052 | } |
1053 | ||
1054 | putchar ('\n'); | |
1055 | } | |
1056 | ||
1057 | printf ("%d:\tend of pattern.\n", p - start); | |
1058 | } | |
1059 | ||
1060 | ||
1061 | void | |
1062 | print_compiled_pattern (bufp) | |
1063 | struct re_pattern_buffer *bufp; | |
1064 | { | |
1065 | unsigned char *buffer = bufp->buffer; | |
1066 | ||
1067 | print_partial_compiled_pattern (buffer, buffer + bufp->used); | |
505bde11 | 1068 | printf ("%ld bytes used/%ld bytes allocated.\n", bufp->used, bufp->allocated); |
fa9a63c5 RM |
1069 | |
1070 | if (bufp->fastmap_accurate && bufp->fastmap) | |
1071 | { | |
1072 | printf ("fastmap: "); | |
1073 | print_fastmap (bufp->fastmap); | |
1074 | } | |
1075 | ||
1076 | printf ("re_nsub: %d\t", bufp->re_nsub); | |
1077 | printf ("regs_alloc: %d\t", bufp->regs_allocated); | |
1078 | printf ("can_be_null: %d\t", bufp->can_be_null); | |
1079 | printf ("newline_anchor: %d\n", bufp->newline_anchor); | |
1080 | printf ("no_sub: %d\t", bufp->no_sub); | |
1081 | printf ("not_bol: %d\t", bufp->not_bol); | |
1082 | printf ("not_eol: %d\t", bufp->not_eol); | |
1083 | printf ("syntax: %d\n", bufp->syntax); | |
505bde11 | 1084 | fflush (stdout); |
fa9a63c5 RM |
1085 | /* Perhaps we should print the translate table? */ |
1086 | } | |
1087 | ||
1088 | ||
1089 | void | |
1090 | print_double_string (where, string1, size1, string2, size2) | |
66f0296e SM |
1091 | re_char *where; |
1092 | re_char *string1; | |
1093 | re_char *string2; | |
fa9a63c5 RM |
1094 | int size1; |
1095 | int size2; | |
1096 | { | |
1097 | unsigned this_char; | |
5e69f11e | 1098 | |
fa9a63c5 RM |
1099 | if (where == NULL) |
1100 | printf ("(null)"); | |
1101 | else | |
1102 | { | |
1103 | if (FIRST_STRING_P (where)) | |
25fe55af RS |
1104 | { |
1105 | for (this_char = where - string1; this_char < size1; this_char++) | |
1106 | putchar (string1[this_char]); | |
fa9a63c5 | 1107 | |
25fe55af RS |
1108 | where = string2; |
1109 | } | |
fa9a63c5 RM |
1110 | |
1111 | for (this_char = where - string2; this_char < size2; this_char++) | |
25fe55af | 1112 | putchar (string2[this_char]); |
fa9a63c5 RM |
1113 | } |
1114 | } | |
1115 | ||
1116 | #else /* not DEBUG */ | |
1117 | ||
1118 | #undef assert | |
1119 | #define assert(e) | |
1120 | ||
1121 | #define DEBUG_STATEMENT(e) | |
1122 | #define DEBUG_PRINT1(x) | |
1123 | #define DEBUG_PRINT2(x1, x2) | |
1124 | #define DEBUG_PRINT3(x1, x2, x3) | |
1125 | #define DEBUG_PRINT4(x1, x2, x3, x4) | |
1126 | #define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) | |
1127 | #define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) | |
1128 | ||
1129 | #endif /* not DEBUG */ | |
1130 | \f | |
1131 | /* Set by `re_set_syntax' to the current regexp syntax to recognize. Can | |
1132 | also be assigned to arbitrarily: each pattern buffer stores its own | |
1133 | syntax, so it can be changed between regex compilations. */ | |
1134 | /* This has no initializer because initialized variables in Emacs | |
1135 | become read-only after dumping. */ | |
1136 | reg_syntax_t re_syntax_options; | |
1137 | ||
1138 | ||
1139 | /* Specify the precise syntax of regexps for compilation. This provides | |
1140 | for compatibility for various utilities which historically have | |
1141 | different, incompatible syntaxes. | |
1142 | ||
1143 | The argument SYNTAX is a bit mask comprised of the various bits | |
25fe55af | 1144 | defined in regex.h. We return the old syntax. */ |
fa9a63c5 RM |
1145 | |
1146 | reg_syntax_t | |
1147 | re_set_syntax (syntax) | |
1148 | reg_syntax_t syntax; | |
1149 | { | |
1150 | reg_syntax_t ret = re_syntax_options; | |
5e69f11e | 1151 | |
fa9a63c5 RM |
1152 | re_syntax_options = syntax; |
1153 | return ret; | |
1154 | } | |
1155 | \f | |
1156 | /* This table gives an error message for each of the error codes listed | |
25fe55af | 1157 | in regex.h. Obviously the order here has to be same as there. |
fa9a63c5 | 1158 | POSIX doesn't require that we do anything for REG_NOERROR, |
25fe55af | 1159 | but why not be nice? */ |
fa9a63c5 RM |
1160 | |
1161 | static const char *re_error_msgid[] = | |
5e69f11e RM |
1162 | { |
1163 | gettext_noop ("Success"), /* REG_NOERROR */ | |
1164 | gettext_noop ("No match"), /* REG_NOMATCH */ | |
1165 | gettext_noop ("Invalid regular expression"), /* REG_BADPAT */ | |
1166 | gettext_noop ("Invalid collation character"), /* REG_ECOLLATE */ | |
1167 | gettext_noop ("Invalid character class name"), /* REG_ECTYPE */ | |
1168 | gettext_noop ("Trailing backslash"), /* REG_EESCAPE */ | |
1169 | gettext_noop ("Invalid back reference"), /* REG_ESUBREG */ | |
1170 | gettext_noop ("Unmatched [ or [^"), /* REG_EBRACK */ | |
1171 | gettext_noop ("Unmatched ( or \\("), /* REG_EPAREN */ | |
1172 | gettext_noop ("Unmatched \\{"), /* REG_EBRACE */ | |
1173 | gettext_noop ("Invalid content of \\{\\}"), /* REG_BADBR */ | |
1174 | gettext_noop ("Invalid range end"), /* REG_ERANGE */ | |
1175 | gettext_noop ("Memory exhausted"), /* REG_ESPACE */ | |
1176 | gettext_noop ("Invalid preceding regular expression"), /* REG_BADRPT */ | |
1177 | gettext_noop ("Premature end of regular expression"), /* REG_EEND */ | |
1178 | gettext_noop ("Regular expression too big"), /* REG_ESIZE */ | |
1179 | gettext_noop ("Unmatched ) or \\)"), /* REG_ERPAREN */ | |
fa9a63c5 RM |
1180 | }; |
1181 | \f | |
25fe55af | 1182 | /* Avoiding alloca during matching, to placate r_alloc. */ |
fa9a63c5 RM |
1183 | |
1184 | /* Define MATCH_MAY_ALLOCATE unless we need to make sure that the | |
1185 | searching and matching functions should not call alloca. On some | |
1186 | systems, alloca is implemented in terms of malloc, and if we're | |
1187 | using the relocating allocator routines, then malloc could cause a | |
1188 | relocation, which might (if the strings being searched are in the | |
1189 | ralloc heap) shift the data out from underneath the regexp | |
1190 | routines. | |
1191 | ||
5e69f11e | 1192 | Here's another reason to avoid allocation: Emacs |
fa9a63c5 RM |
1193 | processes input from X in a signal handler; processing X input may |
1194 | call malloc; if input arrives while a matching routine is calling | |
1195 | malloc, then we're scrod. But Emacs can't just block input while | |
1196 | calling matching routines; then we don't notice interrupts when | |
1197 | they come in. So, Emacs blocks input around all regexp calls | |
1198 | except the matching calls, which it leaves unprotected, in the | |
1199 | faith that they will not malloc. */ | |
1200 | ||
1201 | /* Normally, this is fine. */ | |
1202 | #define MATCH_MAY_ALLOCATE | |
1203 | ||
1204 | /* When using GNU C, we are not REALLY using the C alloca, no matter | |
1205 | what config.h may say. So don't take precautions for it. */ | |
1206 | #ifdef __GNUC__ | |
1207 | #undef C_ALLOCA | |
1208 | #endif | |
1209 | ||
1210 | /* The match routines may not allocate if (1) they would do it with malloc | |
1211 | and (2) it's not safe for them to use malloc. | |
1212 | Note that if REL_ALLOC is defined, matching would not use malloc for the | |
1213 | failure stack, but we would still use it for the register vectors; | |
25fe55af | 1214 | so REL_ALLOC should not affect this. */ |
fa9a63c5 RM |
1215 | #if (defined (C_ALLOCA) || defined (REGEX_MALLOC)) && defined (emacs) |
1216 | #undef MATCH_MAY_ALLOCATE | |
1217 | #endif | |
1218 | ||
1219 | \f | |
1220 | /* Failure stack declarations and macros; both re_compile_fastmap and | |
1221 | re_match_2 use a failure stack. These have to be macros because of | |
1222 | REGEX_ALLOCATE_STACK. */ | |
5e69f11e | 1223 | |
fa9a63c5 | 1224 | |
320a2a73 | 1225 | /* Approximate number of failure points for which to initially allocate space |
fa9a63c5 RM |
1226 | when matching. If this number is exceeded, we allocate more |
1227 | space, so it is not a hard limit. */ | |
1228 | #ifndef INIT_FAILURE_ALLOC | |
320a2a73 | 1229 | #define INIT_FAILURE_ALLOC 20 |
fa9a63c5 RM |
1230 | #endif |
1231 | ||
1232 | /* Roughly the maximum number of failure points on the stack. Would be | |
320a2a73 | 1233 | exactly that if always used TYPICAL_FAILURE_SIZE items each time we failed. |
fa9a63c5 | 1234 | This is a variable only so users of regex can assign to it; we never |
25fe55af | 1235 | change it ourselves. */ |
fa9a63c5 | 1236 | #if defined (MATCH_MAY_ALLOCATE) |
320a2a73 KH |
1237 | /* Note that 4400 is enough to cause a crash on Alpha OSF/1, |
1238 | whose default stack limit is 2mb. In order for a larger | |
1239 | value to work reliably, you have to try to make it accord | |
1240 | with the process stack limit. */ | |
1241 | int re_max_failures = 40000; | |
fa9a63c5 | 1242 | #else |
320a2a73 | 1243 | int re_max_failures = 4000; |
fa9a63c5 RM |
1244 | #endif |
1245 | ||
1246 | union fail_stack_elt | |
1247 | { | |
66f0296e | 1248 | const unsigned char *pointer; |
505bde11 | 1249 | unsigned int integer; |
fa9a63c5 RM |
1250 | }; |
1251 | ||
1252 | typedef union fail_stack_elt fail_stack_elt_t; | |
1253 | ||
1254 | typedef struct | |
1255 | { | |
1256 | fail_stack_elt_t *stack; | |
1257 | unsigned size; | |
505bde11 SM |
1258 | unsigned avail; /* Offset of next open position. */ |
1259 | unsigned frame; /* Offset of the cur constructed frame. */ | |
fa9a63c5 RM |
1260 | } fail_stack_type; |
1261 | ||
505bde11 SM |
1262 | #define PATTERN_STACK_EMPTY() (fail_stack.avail == 0) |
1263 | #define FAIL_STACK_EMPTY() (fail_stack.frame == 0) | |
fa9a63c5 RM |
1264 | #define FAIL_STACK_FULL() (fail_stack.avail == fail_stack.size) |
1265 | ||
1266 | ||
1267 | /* Define macros to initialize and free the failure stack. | |
1268 | Do `return -2' if the alloc fails. */ | |
1269 | ||
1270 | #ifdef MATCH_MAY_ALLOCATE | |
1271 | #define INIT_FAIL_STACK() \ | |
1272 | do { \ | |
1273 | fail_stack.stack = (fail_stack_elt_t *) \ | |
320a2a73 KH |
1274 | REGEX_ALLOCATE_STACK (INIT_FAILURE_ALLOC * TYPICAL_FAILURE_SIZE \ |
1275 | * sizeof (fail_stack_elt_t)); \ | |
fa9a63c5 RM |
1276 | \ |
1277 | if (fail_stack.stack == NULL) \ | |
1278 | return -2; \ | |
1279 | \ | |
1280 | fail_stack.size = INIT_FAILURE_ALLOC; \ | |
1281 | fail_stack.avail = 0; \ | |
505bde11 | 1282 | fail_stack.frame = 0; \ |
fa9a63c5 RM |
1283 | } while (0) |
1284 | ||
1285 | #define RESET_FAIL_STACK() REGEX_FREE_STACK (fail_stack.stack) | |
1286 | #else | |
1287 | #define INIT_FAIL_STACK() \ | |
1288 | do { \ | |
1289 | fail_stack.avail = 0; \ | |
505bde11 | 1290 | fail_stack.frame = 0; \ |
fa9a63c5 RM |
1291 | } while (0) |
1292 | ||
ed0767d8 | 1293 | #define RESET_FAIL_STACK() ((void)0) |
fa9a63c5 RM |
1294 | #endif |
1295 | ||
1296 | ||
320a2a73 KH |
1297 | /* Double the size of FAIL_STACK, up to a limit |
1298 | which allows approximately `re_max_failures' items. | |
fa9a63c5 RM |
1299 | |
1300 | Return 1 if succeeds, and 0 if either ran out of memory | |
5e69f11e RM |
1301 | allocating space for it or it was already too large. |
1302 | ||
25fe55af | 1303 | REGEX_REALLOCATE_STACK requires `destination' be declared. */ |
fa9a63c5 | 1304 | |
320a2a73 KH |
1305 | /* Factor to increase the failure stack size by |
1306 | when we increase it. | |
1307 | This used to be 2, but 2 was too wasteful | |
1308 | because the old discarded stacks added up to as much space | |
1309 | were as ultimate, maximum-size stack. */ | |
1310 | #define FAIL_STACK_GROWTH_FACTOR 4 | |
1311 | ||
1312 | #define GROW_FAIL_STACK(fail_stack) \ | |
eead07d6 KH |
1313 | (((fail_stack).size * sizeof (fail_stack_elt_t) \ |
1314 | >= re_max_failures * TYPICAL_FAILURE_SIZE) \ | |
fa9a63c5 | 1315 | ? 0 \ |
320a2a73 KH |
1316 | : ((fail_stack).stack \ |
1317 | = (fail_stack_elt_t *) \ | |
25fe55af RS |
1318 | REGEX_REALLOCATE_STACK ((fail_stack).stack, \ |
1319 | (fail_stack).size * sizeof (fail_stack_elt_t), \ | |
320a2a73 KH |
1320 | MIN (re_max_failures * TYPICAL_FAILURE_SIZE, \ |
1321 | ((fail_stack).size * sizeof (fail_stack_elt_t) \ | |
1322 | * FAIL_STACK_GROWTH_FACTOR))), \ | |
fa9a63c5 RM |
1323 | \ |
1324 | (fail_stack).stack == NULL \ | |
1325 | ? 0 \ | |
6453db45 KH |
1326 | : ((fail_stack).size \ |
1327 | = (MIN (re_max_failures * TYPICAL_FAILURE_SIZE, \ | |
1328 | ((fail_stack).size * sizeof (fail_stack_elt_t) \ | |
1329 | * FAIL_STACK_GROWTH_FACTOR)) \ | |
1330 | / sizeof (fail_stack_elt_t)), \ | |
25fe55af | 1331 | 1))) |
fa9a63c5 RM |
1332 | |
1333 | ||
5e69f11e | 1334 | /* Push pointer POINTER on FAIL_STACK. |
fa9a63c5 RM |
1335 | Return 1 if was able to do so and 0 if ran out of memory allocating |
1336 | space to do so. */ | |
1337 | #define PUSH_PATTERN_OP(POINTER, FAIL_STACK) \ | |
1338 | ((FAIL_STACK_FULL () \ | |
320a2a73 | 1339 | && !GROW_FAIL_STACK (FAIL_STACK)) \ |
fa9a63c5 RM |
1340 | ? 0 \ |
1341 | : ((FAIL_STACK).stack[(FAIL_STACK).avail++].pointer = POINTER, \ | |
1342 | 1)) | |
505bde11 | 1343 | #define POP_PATTERN_OP() POP_FAILURE_POINTER () |
fa9a63c5 RM |
1344 | |
1345 | /* Push a pointer value onto the failure stack. | |
1346 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1347 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1348 | #define PUSH_FAILURE_POINTER(item) \ |
1349 | fail_stack.stack[fail_stack.avail++].pointer = (unsigned char *) (item) | |
1350 | ||
1351 | /* This pushes an integer-valued item onto the failure stack. | |
1352 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1353 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1354 | #define PUSH_FAILURE_INT(item) \ |
1355 | fail_stack.stack[fail_stack.avail++].integer = (item) | |
1356 | ||
1357 | /* Push a fail_stack_elt_t value onto the failure stack. | |
1358 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1359 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1360 | #define PUSH_FAILURE_ELT(item) \ |
1361 | fail_stack.stack[fail_stack.avail++] = (item) | |
1362 | ||
1363 | /* These three POP... operations complement the three PUSH... operations. | |
1364 | All assume that `fail_stack' is nonempty. */ | |
1365 | #define POP_FAILURE_POINTER() fail_stack.stack[--fail_stack.avail].pointer | |
1366 | #define POP_FAILURE_INT() fail_stack.stack[--fail_stack.avail].integer | |
1367 | #define POP_FAILURE_ELT() fail_stack.stack[--fail_stack.avail] | |
1368 | ||
505bde11 SM |
1369 | /* Individual items aside from the registers. */ |
1370 | #define NUM_NONREG_ITEMS 3 | |
1371 | ||
1372 | /* Used to examine the stack (to detect infinite loops). */ | |
1373 | #define FAILURE_PAT(h) fail_stack.stack[(h) - 1].pointer | |
66f0296e | 1374 | #define FAILURE_STR(h) (fail_stack.stack[(h) - 2].pointer) |
505bde11 SM |
1375 | #define NEXT_FAILURE_HANDLE(h) fail_stack.stack[(h) - 3].integer |
1376 | #define TOP_FAILURE_HANDLE() fail_stack.frame | |
fa9a63c5 RM |
1377 | |
1378 | ||
505bde11 SM |
1379 | #define ENSURE_FAIL_STACK(space) \ |
1380 | while (REMAINING_AVAIL_SLOTS <= space) { \ | |
1381 | if (!GROW_FAIL_STACK (fail_stack)) \ | |
1382 | return -2; \ | |
1383 | DEBUG_PRINT2 ("\n Doubled stack; size now: %d\n", (fail_stack).size);\ | |
1384 | DEBUG_PRINT2 (" slots available: %d\n", REMAINING_AVAIL_SLOTS);\ | |
1385 | } | |
1386 | ||
1387 | /* Push register NUM onto the stack. */ | |
1388 | #define PUSH_FAILURE_REG(num) \ | |
1389 | do { \ | |
1390 | char *destination; \ | |
1391 | ENSURE_FAIL_STACK(3); \ | |
1392 | DEBUG_PRINT4 (" Push reg %d (spanning %p -> %p)\n", \ | |
1393 | num, regstart[num], regend[num]); \ | |
1394 | PUSH_FAILURE_POINTER (regstart[num]); \ | |
1395 | PUSH_FAILURE_POINTER (regend[num]); \ | |
1396 | PUSH_FAILURE_INT (num); \ | |
1397 | } while (0) | |
1398 | ||
1399 | /* Pop a saved register off the stack. */ | |
1400 | #define POP_FAILURE_REG() \ | |
1401 | do { \ | |
1402 | int reg = POP_FAILURE_INT (); \ | |
1403 | regend[reg] = POP_FAILURE_POINTER (); \ | |
1404 | regstart[reg] = POP_FAILURE_POINTER (); \ | |
1405 | DEBUG_PRINT4 (" Pop reg %d (spanning %p -> %p)\n", \ | |
1406 | reg, regstart[reg], regend[reg]); \ | |
1407 | } while (0) | |
1408 | ||
1409 | /* Check that we are not stuck in an infinite loop. */ | |
1410 | #define CHECK_INFINITE_LOOP(pat_cur, string_place) \ | |
1411 | do { \ | |
1412 | int failure = TOP_FAILURE_HANDLE(); \ | |
1413 | /* Check for infinite matching loops */ \ | |
1414 | while (failure > 0 && \ | |
1415 | (FAILURE_STR (failure) == string_place \ | |
1416 | || FAILURE_STR (failure) == NULL)) \ | |
1417 | { \ | |
1418 | assert (FAILURE_PAT (failure) >= bufp->buffer \ | |
66f0296e | 1419 | && FAILURE_PAT (failure) <= bufp->buffer + bufp->used); \ |
505bde11 SM |
1420 | if (FAILURE_PAT (failure) == pat_cur) \ |
1421 | goto fail; \ | |
66f0296e | 1422 | DEBUG_PRINT2 (" Other pattern: %p\n", FAILURE_PAT (failure)); \ |
505bde11 SM |
1423 | failure = NEXT_FAILURE_HANDLE(failure); \ |
1424 | } \ | |
1425 | DEBUG_PRINT2 (" Other string: %p\n", FAILURE_STR (failure)); \ | |
1426 | } while (0) | |
1427 | ||
fa9a63c5 | 1428 | /* Push the information about the state we will need |
5e69f11e RM |
1429 | if we ever fail back to it. |
1430 | ||
505bde11 | 1431 | Requires variables fail_stack, regstart, regend and |
320a2a73 | 1432 | num_regs be declared. GROW_FAIL_STACK requires `destination' be |
fa9a63c5 | 1433 | declared. |
5e69f11e | 1434 | |
fa9a63c5 RM |
1435 | Does `return FAILURE_CODE' if runs out of memory. */ |
1436 | ||
505bde11 SM |
1437 | #define PUSH_FAILURE_POINT(pattern, string_place) \ |
1438 | do { \ | |
1439 | char *destination; \ | |
1440 | /* Must be int, so when we don't save any registers, the arithmetic \ | |
1441 | of 0 + -1 isn't done as unsigned. */ \ | |
1442 | \ | |
1443 | DEBUG_STATEMENT (failure_id++); \ | |
1444 | DEBUG_STATEMENT (nfailure_points_pushed++); \ | |
1445 | DEBUG_PRINT2 ("\nPUSH_FAILURE_POINT #%u:\n", failure_id); \ | |
1446 | DEBUG_PRINT2 (" Before push, next avail: %d\n", (fail_stack).avail); \ | |
1447 | DEBUG_PRINT2 (" size: %d\n", (fail_stack).size);\ | |
1448 | \ | |
1449 | ENSURE_FAIL_STACK (NUM_NONREG_ITEMS); \ | |
1450 | \ | |
1451 | DEBUG_PRINT1 ("\n"); \ | |
1452 | \ | |
1453 | DEBUG_PRINT2 (" Push frame index: %d\n", fail_stack.frame); \ | |
1454 | PUSH_FAILURE_INT (fail_stack.frame); \ | |
1455 | \ | |
1456 | DEBUG_PRINT2 (" Push string %p: `", string_place); \ | |
1457 | DEBUG_PRINT_DOUBLE_STRING (string_place, string1, size1, string2, size2);\ | |
1458 | DEBUG_PRINT1 ("'\n"); \ | |
1459 | PUSH_FAILURE_POINTER (string_place); \ | |
1460 | \ | |
1461 | DEBUG_PRINT2 (" Push pattern %p: ", pattern); \ | |
1462 | DEBUG_PRINT_COMPILED_PATTERN (bufp, pattern, pend); \ | |
1463 | PUSH_FAILURE_POINTER (pattern); \ | |
1464 | \ | |
1465 | /* Close the frame by moving the frame pointer past it. */ \ | |
1466 | fail_stack.frame = fail_stack.avail; \ | |
1467 | } while (0) | |
fa9a63c5 | 1468 | |
320a2a73 KH |
1469 | /* Estimate the size of data pushed by a typical failure stack entry. |
1470 | An estimate is all we need, because all we use this for | |
1471 | is to choose a limit for how big to make the failure stack. */ | |
1472 | ||
1473 | #define TYPICAL_FAILURE_SIZE 20 | |
fa9a63c5 | 1474 | |
fa9a63c5 RM |
1475 | /* How many items can still be added to the stack without overflowing it. */ |
1476 | #define REMAINING_AVAIL_SLOTS ((fail_stack).size - (fail_stack).avail) | |
1477 | ||
1478 | ||
1479 | /* Pops what PUSH_FAIL_STACK pushes. | |
1480 | ||
1481 | We restore into the parameters, all of which should be lvalues: | |
1482 | STR -- the saved data position. | |
1483 | PAT -- the saved pattern position. | |
fa9a63c5 | 1484 | REGSTART, REGEND -- arrays of string positions. |
5e69f11e | 1485 | |
fa9a63c5 | 1486 | Also assumes the variables `fail_stack' and (if debugging), `bufp', |
25fe55af | 1487 | `pend', `string1', `size1', `string2', and `size2'. */ |
fa9a63c5 | 1488 | |
505bde11 SM |
1489 | #define POP_FAILURE_POINT(str, pat) \ |
1490 | do { \ | |
fa9a63c5 RM |
1491 | assert (!FAIL_STACK_EMPTY ()); \ |
1492 | \ | |
1493 | /* Remove failure points and point to how many regs pushed. */ \ | |
1494 | DEBUG_PRINT1 ("POP_FAILURE_POINT:\n"); \ | |
1495 | DEBUG_PRINT2 (" Before pop, next avail: %d\n", fail_stack.avail); \ | |
25fe55af | 1496 | DEBUG_PRINT2 (" size: %d\n", fail_stack.size); \ |
fa9a63c5 | 1497 | \ |
505bde11 SM |
1498 | /* Pop the saved registers. */ \ |
1499 | while (fail_stack.frame < fail_stack.avail) \ | |
1500 | POP_FAILURE_REG (); \ | |
fa9a63c5 | 1501 | \ |
505bde11 SM |
1502 | pat = (unsigned char *) POP_FAILURE_POINTER (); \ |
1503 | DEBUG_PRINT2 (" Popping pattern %p: ", pat); \ | |
1504 | DEBUG_PRINT_COMPILED_PATTERN (bufp, pat, pend); \ | |
fa9a63c5 RM |
1505 | \ |
1506 | /* If the saved string location is NULL, it came from an \ | |
1507 | on_failure_keep_string_jump opcode, and we want to throw away the \ | |
1508 | saved NULL, thus retaining our current position in the string. */ \ | |
66f0296e | 1509 | str = (re_char *) POP_FAILURE_POINTER (); \ |
505bde11 | 1510 | DEBUG_PRINT2 (" Popping string %p: `", str); \ |
fa9a63c5 RM |
1511 | DEBUG_PRINT_DOUBLE_STRING (str, string1, size1, string2, size2); \ |
1512 | DEBUG_PRINT1 ("'\n"); \ | |
1513 | \ | |
505bde11 SM |
1514 | fail_stack.frame = POP_FAILURE_INT (); \ |
1515 | DEBUG_PRINT2 (" Popping frame index: %d\n", fail_stack.frame); \ | |
fa9a63c5 | 1516 | \ |
505bde11 SM |
1517 | assert (fail_stack.avail >= 0); \ |
1518 | assert (fail_stack.frame <= fail_stack.avail); \ | |
fa9a63c5 | 1519 | \ |
fa9a63c5 | 1520 | DEBUG_STATEMENT (nfailure_points_popped++); \ |
505bde11 | 1521 | } while (0) /* POP_FAILURE_POINT */ |
fa9a63c5 RM |
1522 | |
1523 | ||
1524 | \f | |
fa9a63c5 | 1525 | /* Registers are set to a sentinel when they haven't yet matched. */ |
505bde11 | 1526 | #define REG_UNSET_VALUE NULL |
fa9a63c5 RM |
1527 | #define REG_UNSET(e) ((e) == REG_UNSET_VALUE) |
1528 | \f | |
1529 | /* Subroutine declarations and macros for regex_compile. */ | |
1530 | ||
99633e97 SM |
1531 | static void store_op1 _RE_ARGS((re_opcode_t op, unsigned char *loc, int arg)); |
1532 | static void store_op2 _RE_ARGS((re_opcode_t op, unsigned char *loc, | |
1533 | int arg1, int arg2)); | |
1534 | static void insert_op1 _RE_ARGS((re_opcode_t op, unsigned char *loc, | |
1535 | int arg, unsigned char *end)); | |
1536 | static void insert_op2 _RE_ARGS((re_opcode_t op, unsigned char *loc, | |
1537 | int arg1, int arg2, unsigned char *end)); | |
1538 | static boolean at_begline_loc_p _RE_ARGS((const unsigned char *pattern, | |
1539 | const unsigned char *p, | |
1540 | reg_syntax_t syntax)); | |
1541 | static boolean at_endline_loc_p _RE_ARGS((const unsigned char *p, | |
1542 | const unsigned char *pend, | |
1543 | reg_syntax_t syntax)); | |
4e8a9132 | 1544 | static unsigned char *skip_one_char _RE_ARGS((unsigned char *p)); |
fa9a63c5 | 1545 | |
5e69f11e | 1546 | /* Fetch the next character in the uncompiled pattern---translating it |
fa9a63c5 RM |
1547 | if necessary. Also cast from a signed character in the constant |
1548 | string passed to us by the user to an unsigned char that we can use | |
1549 | as an array index (in, e.g., `translate'). */ | |
1550 | #define PATFETCH(c) \ | |
99633e97 SM |
1551 | do { \ |
1552 | PATFETCH_RAW (c); \ | |
28703c16 | 1553 | if (RE_TRANSLATE_P (translate)) c = RE_TRANSLATE (translate, c); \ |
fa9a63c5 RM |
1554 | } while (0) |
1555 | ||
1556 | /* Fetch the next character in the uncompiled pattern, with no | |
25fe55af | 1557 | translation. */ |
fa9a63c5 RM |
1558 | #define PATFETCH_RAW(c) \ |
1559 | do {if (p == pend) return REG_EEND; \ | |
66f0296e | 1560 | c = *p++; \ |
fa9a63c5 RM |
1561 | } while (0) |
1562 | ||
1563 | /* Go backwards one character in the pattern. */ | |
1564 | #define PATUNFETCH p-- | |
1565 | ||
1566 | ||
1567 | /* If `translate' is non-null, return translate[D], else just D. We | |
1568 | cast the subscript to translate because some data is declared as | |
1569 | `char *', to avoid warnings when a string constant is passed. But | |
1570 | when we use a character as a subscript we must make it unsigned. */ | |
6676cb1c RS |
1571 | #ifndef TRANSLATE |
1572 | #define TRANSLATE(d) \ | |
66f0296e | 1573 | (RE_TRANSLATE_P (translate) ? RE_TRANSLATE (translate, (d)) : (d)) |
6676cb1c | 1574 | #endif |
fa9a63c5 RM |
1575 | |
1576 | ||
1577 | /* Macros for outputting the compiled pattern into `buffer'. */ | |
1578 | ||
1579 | /* If the buffer isn't allocated when it comes in, use this. */ | |
1580 | #define INIT_BUF_SIZE 32 | |
1581 | ||
25fe55af | 1582 | /* Make sure we have at least N more bytes of space in buffer. */ |
fa9a63c5 RM |
1583 | #define GET_BUFFER_SPACE(n) \ |
1584 | while (b - bufp->buffer + (n) > bufp->allocated) \ | |
1585 | EXTEND_BUFFER () | |
1586 | ||
1587 | /* Make sure we have one more byte of buffer space and then add C to it. */ | |
1588 | #define BUF_PUSH(c) \ | |
1589 | do { \ | |
1590 | GET_BUFFER_SPACE (1); \ | |
1591 | *b++ = (unsigned char) (c); \ | |
1592 | } while (0) | |
1593 | ||
1594 | ||
1595 | /* Ensure we have two more bytes of buffer space and then append C1 and C2. */ | |
1596 | #define BUF_PUSH_2(c1, c2) \ | |
1597 | do { \ | |
1598 | GET_BUFFER_SPACE (2); \ | |
1599 | *b++ = (unsigned char) (c1); \ | |
1600 | *b++ = (unsigned char) (c2); \ | |
1601 | } while (0) | |
1602 | ||
1603 | ||
25fe55af | 1604 | /* As with BUF_PUSH_2, except for three bytes. */ |
fa9a63c5 RM |
1605 | #define BUF_PUSH_3(c1, c2, c3) \ |
1606 | do { \ | |
1607 | GET_BUFFER_SPACE (3); \ | |
1608 | *b++ = (unsigned char) (c1); \ | |
1609 | *b++ = (unsigned char) (c2); \ | |
1610 | *b++ = (unsigned char) (c3); \ | |
1611 | } while (0) | |
1612 | ||
1613 | ||
1614 | /* Store a jump with opcode OP at LOC to location TO. We store a | |
25fe55af | 1615 | relative address offset by the three bytes the jump itself occupies. */ |
fa9a63c5 RM |
1616 | #define STORE_JUMP(op, loc, to) \ |
1617 | store_op1 (op, loc, (to) - (loc) - 3) | |
1618 | ||
1619 | /* Likewise, for a two-argument jump. */ | |
1620 | #define STORE_JUMP2(op, loc, to, arg) \ | |
1621 | store_op2 (op, loc, (to) - (loc) - 3, arg) | |
1622 | ||
25fe55af | 1623 | /* Like `STORE_JUMP', but for inserting. Assume `b' is the buffer end. */ |
fa9a63c5 RM |
1624 | #define INSERT_JUMP(op, loc, to) \ |
1625 | insert_op1 (op, loc, (to) - (loc) - 3, b) | |
1626 | ||
1627 | /* Like `STORE_JUMP2', but for inserting. Assume `b' is the buffer end. */ | |
1628 | #define INSERT_JUMP2(op, loc, to, arg) \ | |
1629 | insert_op2 (op, loc, (to) - (loc) - 3, arg, b) | |
1630 | ||
1631 | ||
1632 | /* This is not an arbitrary limit: the arguments which represent offsets | |
25fe55af | 1633 | into the pattern are two bytes long. So if 2^16 bytes turns out to |
fa9a63c5 RM |
1634 | be too small, many things would have to change. */ |
1635 | #define MAX_BUF_SIZE (1L << 16) | |
1636 | ||
1637 | ||
1638 | /* Extend the buffer by twice its current size via realloc and | |
1639 | reset the pointers that pointed into the old block to point to the | |
1640 | correct places in the new one. If extending the buffer results in it | |
25fe55af | 1641 | being larger than MAX_BUF_SIZE, then flag memory exhausted. */ |
fa9a63c5 | 1642 | #define EXTEND_BUFFER() \ |
25fe55af | 1643 | do { \ |
fa9a63c5 | 1644 | unsigned char *old_buffer = bufp->buffer; \ |
25fe55af | 1645 | if (bufp->allocated == MAX_BUF_SIZE) \ |
fa9a63c5 RM |
1646 | return REG_ESIZE; \ |
1647 | bufp->allocated <<= 1; \ | |
1648 | if (bufp->allocated > MAX_BUF_SIZE) \ | |
25fe55af | 1649 | bufp->allocated = MAX_BUF_SIZE; \ |
fa9a63c5 RM |
1650 | bufp->buffer = (unsigned char *) realloc (bufp->buffer, bufp->allocated);\ |
1651 | if (bufp->buffer == NULL) \ | |
1652 | return REG_ESPACE; \ | |
1653 | /* If the buffer moved, move all the pointers into it. */ \ | |
1654 | if (old_buffer != bufp->buffer) \ | |
1655 | { \ | |
25fe55af RS |
1656 | b = (b - old_buffer) + bufp->buffer; \ |
1657 | begalt = (begalt - old_buffer) + bufp->buffer; \ | |
1658 | if (fixup_alt_jump) \ | |
1659 | fixup_alt_jump = (fixup_alt_jump - old_buffer) + bufp->buffer;\ | |
1660 | if (laststart) \ | |
1661 | laststart = (laststart - old_buffer) + bufp->buffer; \ | |
1662 | if (pending_exact) \ | |
1663 | pending_exact = (pending_exact - old_buffer) + bufp->buffer; \ | |
fa9a63c5 RM |
1664 | } \ |
1665 | } while (0) | |
1666 | ||
1667 | ||
1668 | /* Since we have one byte reserved for the register number argument to | |
1669 | {start,stop}_memory, the maximum number of groups we can report | |
1670 | things about is what fits in that byte. */ | |
1671 | #define MAX_REGNUM 255 | |
1672 | ||
1673 | /* But patterns can have more than `MAX_REGNUM' registers. We just | |
1674 | ignore the excess. */ | |
1675 | typedef unsigned regnum_t; | |
1676 | ||
1677 | ||
1678 | /* Macros for the compile stack. */ | |
1679 | ||
1680 | /* Since offsets can go either forwards or backwards, this type needs to | |
25fe55af | 1681 | be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1. */ |
fa9a63c5 RM |
1682 | typedef int pattern_offset_t; |
1683 | ||
1684 | typedef struct | |
1685 | { | |
1686 | pattern_offset_t begalt_offset; | |
1687 | pattern_offset_t fixup_alt_jump; | |
5e69f11e | 1688 | pattern_offset_t laststart_offset; |
fa9a63c5 RM |
1689 | regnum_t regnum; |
1690 | } compile_stack_elt_t; | |
1691 | ||
1692 | ||
1693 | typedef struct | |
1694 | { | |
1695 | compile_stack_elt_t *stack; | |
1696 | unsigned size; | |
1697 | unsigned avail; /* Offset of next open position. */ | |
1698 | } compile_stack_type; | |
1699 | ||
1700 | ||
1701 | #define INIT_COMPILE_STACK_SIZE 32 | |
1702 | ||
1703 | #define COMPILE_STACK_EMPTY (compile_stack.avail == 0) | |
1704 | #define COMPILE_STACK_FULL (compile_stack.avail == compile_stack.size) | |
1705 | ||
25fe55af | 1706 | /* The next available element. */ |
fa9a63c5 RM |
1707 | #define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail]) |
1708 | ||
1709 | ||
b18215fc RS |
1710 | /* Structure to manage work area for range table. */ |
1711 | struct range_table_work_area | |
1712 | { | |
1713 | int *table; /* actual work area. */ | |
1714 | int allocated; /* allocated size for work area in bytes. */ | |
25fe55af | 1715 | int used; /* actually used size in words. */ |
96cc36cc | 1716 | int bits; /* flag to record character classes */ |
b18215fc RS |
1717 | }; |
1718 | ||
1719 | /* Make sure that WORK_AREA can hold more N multibyte characters. */ | |
1720 | #define EXTEND_RANGE_TABLE_WORK_AREA(work_area, n) \ | |
1721 | do { \ | |
1722 | if (((work_area).used + (n)) * sizeof (int) > (work_area).allocated) \ | |
1723 | { \ | |
1724 | (work_area).allocated += 16 * sizeof (int); \ | |
1725 | if ((work_area).table) \ | |
1726 | (work_area).table \ | |
1727 | = (int *) realloc ((work_area).table, (work_area).allocated); \ | |
1728 | else \ | |
1729 | (work_area).table \ | |
1730 | = (int *) malloc ((work_area).allocated); \ | |
1731 | if ((work_area).table == 0) \ | |
1732 | FREE_STACK_RETURN (REG_ESPACE); \ | |
1733 | } \ | |
1734 | } while (0) | |
1735 | ||
96cc36cc RS |
1736 | #define SET_RANGE_TABLE_WORK_AREA_BIT(work_area, bit) \ |
1737 | (work_area).bits |= (bit) | |
1738 | ||
1739 | /* These bits represent the various character classes such as [:alnum:] | |
1740 | in a charset's range table. */ | |
1741 | #define BIT_ALNUM 0x1 | |
1742 | #define BIT_ALPHA 0x2 | |
1743 | #define BIT_WORD 0x4 | |
f71b19b6 DL |
1744 | #define BIT_ASCII 0x8 |
1745 | #define BIT_NONASCII 0x10 | |
96cc36cc RS |
1746 | #define BIT_GRAPH 0x20 |
1747 | #define BIT_LOWER 0x40 | |
1748 | #define BIT_PRINT 0x80 | |
1749 | #define BIT_PUNCT 0x100 | |
1750 | #define BIT_SPACE 0x200 | |
1751 | #define BIT_UPPER 0x400 | |
f71b19b6 DL |
1752 | #define BIT_UNIBYTE 0x800 |
1753 | #define BIT_MULTIBYTE 0x1000 | |
96cc36cc | 1754 | |
b18215fc RS |
1755 | /* Set a range (RANGE_START, RANGE_END) to WORK_AREA. */ |
1756 | #define SET_RANGE_TABLE_WORK_AREA(work_area, range_start, range_end) \ | |
1757 | do { \ | |
1758 | EXTEND_RANGE_TABLE_WORK_AREA ((work_area), 2); \ | |
1759 | (work_area).table[(work_area).used++] = (range_start); \ | |
1760 | (work_area).table[(work_area).used++] = (range_end); \ | |
1761 | } while (0) | |
1762 | ||
25fe55af | 1763 | /* Free allocated memory for WORK_AREA. */ |
b18215fc RS |
1764 | #define FREE_RANGE_TABLE_WORK_AREA(work_area) \ |
1765 | do { \ | |
1766 | if ((work_area).table) \ | |
1767 | free ((work_area).table); \ | |
1768 | } while (0) | |
1769 | ||
96cc36cc | 1770 | #define CLEAR_RANGE_TABLE_WORK_USED(work_area) ((work_area).used = 0, (work_area).bits = 0) |
b18215fc | 1771 | #define RANGE_TABLE_WORK_USED(work_area) ((work_area).used) |
96cc36cc | 1772 | #define RANGE_TABLE_WORK_BITS(work_area) ((work_area).bits) |
b18215fc RS |
1773 | #define RANGE_TABLE_WORK_ELT(work_area, i) ((work_area).table[i]) |
1774 | ||
1775 | ||
fa9a63c5 | 1776 | /* Set the bit for character C in a list. */ |
25fe55af RS |
1777 | #define SET_LIST_BIT(c) \ |
1778 | (b[((unsigned char) (c)) / BYTEWIDTH] \ | |
fa9a63c5 RM |
1779 | |= 1 << (((unsigned char) c) % BYTEWIDTH)) |
1780 | ||
1781 | ||
1782 | /* Get the next unsigned number in the uncompiled pattern. */ | |
25fe55af | 1783 | #define GET_UNSIGNED_NUMBER(num) \ |
99633e97 | 1784 | do { if (p != pend) \ |
fa9a63c5 | 1785 | { \ |
25fe55af RS |
1786 | PATFETCH (c); \ |
1787 | while (ISDIGIT (c)) \ | |
1788 | { \ | |
1789 | if (num < 0) \ | |
1790 | num = 0; \ | |
1791 | num = num * 10 + c - '0'; \ | |
1792 | if (p == pend) \ | |
1793 | break; \ | |
1794 | PATFETCH (c); \ | |
1795 | } \ | |
1796 | } \ | |
99633e97 | 1797 | } while (0) |
fa9a63c5 RM |
1798 | |
1799 | #define CHAR_CLASS_MAX_LENGTH 6 /* Namely, `xdigit'. */ | |
1800 | ||
1801 | #define IS_CHAR_CLASS(string) \ | |
1802 | (STREQ (string, "alpha") || STREQ (string, "upper") \ | |
1803 | || STREQ (string, "lower") || STREQ (string, "digit") \ | |
1804 | || STREQ (string, "alnum") || STREQ (string, "xdigit") \ | |
1805 | || STREQ (string, "space") || STREQ (string, "print") \ | |
1806 | || STREQ (string, "punct") || STREQ (string, "graph") \ | |
96cc36cc | 1807 | || STREQ (string, "cntrl") || STREQ (string, "blank") \ |
f71b19b6 DL |
1808 | || STREQ (string, "word") \ |
1809 | || STREQ (string, "ascii") || STREQ (string, "nonascii") \ | |
1810 | || STREQ (string, "unibyte") || STREQ (string, "multibyte")) | |
99633e97 SM |
1811 | |
1812 | /* QUIT is only used on NTemacs. */ | |
1813 | #if !defined (WINDOWSNT) || !defined (emacs) | |
1814 | #undef QUIT | |
1815 | #define QUIT | |
1816 | #endif | |
fa9a63c5 RM |
1817 | \f |
1818 | #ifndef MATCH_MAY_ALLOCATE | |
1819 | ||
1820 | /* If we cannot allocate large objects within re_match_2_internal, | |
1821 | we make the fail stack and register vectors global. | |
1822 | The fail stack, we grow to the maximum size when a regexp | |
1823 | is compiled. | |
1824 | The register vectors, we adjust in size each time we | |
1825 | compile a regexp, according to the number of registers it needs. */ | |
1826 | ||
1827 | static fail_stack_type fail_stack; | |
1828 | ||
1829 | /* Size with which the following vectors are currently allocated. | |
1830 | That is so we can make them bigger as needed, | |
25fe55af | 1831 | but never make them smaller. */ |
fa9a63c5 RM |
1832 | static int regs_allocated_size; |
1833 | ||
66f0296e SM |
1834 | static re_char ** regstart, ** regend; |
1835 | static re_char **best_regstart, **best_regend; | |
fa9a63c5 RM |
1836 | |
1837 | /* Make the register vectors big enough for NUM_REGS registers, | |
25fe55af | 1838 | but don't make them smaller. */ |
fa9a63c5 RM |
1839 | |
1840 | static | |
1841 | regex_grow_registers (num_regs) | |
1842 | int num_regs; | |
1843 | { | |
1844 | if (num_regs > regs_allocated_size) | |
1845 | { | |
66f0296e SM |
1846 | RETALLOC_IF (regstart, num_regs, re_char *); |
1847 | RETALLOC_IF (regend, num_regs, re_char *); | |
1848 | RETALLOC_IF (best_regstart, num_regs, re_char *); | |
1849 | RETALLOC_IF (best_regend, num_regs, re_char *); | |
fa9a63c5 RM |
1850 | |
1851 | regs_allocated_size = num_regs; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | #endif /* not MATCH_MAY_ALLOCATE */ | |
1856 | \f | |
99633e97 SM |
1857 | static boolean group_in_compile_stack _RE_ARGS ((compile_stack_type |
1858 | compile_stack, | |
1859 | regnum_t regnum)); | |
1860 | ||
fa9a63c5 RM |
1861 | /* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX. |
1862 | Returns one of error codes defined in `regex.h', or zero for success. | |
1863 | ||
1864 | Assumes the `allocated' (and perhaps `buffer') and `translate' | |
1865 | fields are set in BUFP on entry. | |
1866 | ||
1867 | If it succeeds, results are put in BUFP (if it returns an error, the | |
1868 | contents of BUFP are undefined): | |
1869 | `buffer' is the compiled pattern; | |
1870 | `syntax' is set to SYNTAX; | |
1871 | `used' is set to the length of the compiled pattern; | |
1872 | `fastmap_accurate' is zero; | |
1873 | `re_nsub' is the number of subexpressions in PATTERN; | |
1874 | `not_bol' and `not_eol' are zero; | |
5e69f11e | 1875 | |
fa9a63c5 RM |
1876 | The `fastmap' and `newline_anchor' fields are neither |
1877 | examined nor set. */ | |
1878 | ||
505bde11 SM |
1879 | /* Insert the `jump' from the end of last alternative to "here". |
1880 | The space for the jump has already been allocated. */ | |
1881 | #define FIXUP_ALT_JUMP() \ | |
1882 | do { \ | |
1883 | if (fixup_alt_jump) \ | |
1884 | STORE_JUMP (jump, fixup_alt_jump, b); \ | |
1885 | } while (0) | |
1886 | ||
1887 | ||
fa9a63c5 RM |
1888 | /* Return, freeing storage we allocated. */ |
1889 | #define FREE_STACK_RETURN(value) \ | |
b18215fc RS |
1890 | do { \ |
1891 | FREE_RANGE_TABLE_WORK_AREA (range_table_work); \ | |
1892 | free (compile_stack.stack); \ | |
1893 | return value; \ | |
1894 | } while (0) | |
fa9a63c5 RM |
1895 | |
1896 | static reg_errcode_t | |
1897 | regex_compile (pattern, size, syntax, bufp) | |
66f0296e | 1898 | re_char *pattern; |
fa9a63c5 RM |
1899 | int size; |
1900 | reg_syntax_t syntax; | |
1901 | struct re_pattern_buffer *bufp; | |
1902 | { | |
1903 | /* We fetch characters from PATTERN here. Even though PATTERN is | |
1904 | `char *' (i.e., signed), we declare these variables as unsigned, so | |
1905 | they can be reliably used as array indices. */ | |
b18215fc | 1906 | register unsigned int c, c1; |
5e69f11e | 1907 | |
fa9a63c5 | 1908 | /* A random temporary spot in PATTERN. */ |
66f0296e | 1909 | re_char *p1; |
fa9a63c5 RM |
1910 | |
1911 | /* Points to the end of the buffer, where we should append. */ | |
1912 | register unsigned char *b; | |
5e69f11e | 1913 | |
fa9a63c5 RM |
1914 | /* Keeps track of unclosed groups. */ |
1915 | compile_stack_type compile_stack; | |
1916 | ||
1917 | /* Points to the current (ending) position in the pattern. */ | |
22336245 RS |
1918 | #ifdef AIX |
1919 | /* `const' makes AIX compiler fail. */ | |
66f0296e | 1920 | unsigned char *p = pattern; |
22336245 | 1921 | #else |
66f0296e | 1922 | re_char *p = pattern; |
22336245 | 1923 | #endif |
66f0296e | 1924 | re_char *pend = pattern + size; |
5e69f11e | 1925 | |
fa9a63c5 | 1926 | /* How to translate the characters in the pattern. */ |
6676cb1c | 1927 | RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 RM |
1928 | |
1929 | /* Address of the count-byte of the most recently inserted `exactn' | |
1930 | command. This makes it possible to tell if a new exact-match | |
1931 | character can be added to that command or if the character requires | |
1932 | a new `exactn' command. */ | |
1933 | unsigned char *pending_exact = 0; | |
1934 | ||
1935 | /* Address of start of the most recently finished expression. | |
1936 | This tells, e.g., postfix * where to find the start of its | |
1937 | operand. Reset at the beginning of groups and alternatives. */ | |
1938 | unsigned char *laststart = 0; | |
1939 | ||
1940 | /* Address of beginning of regexp, or inside of last group. */ | |
1941 | unsigned char *begalt; | |
1942 | ||
1943 | /* Place in the uncompiled pattern (i.e., the {) to | |
1944 | which to go back if the interval is invalid. */ | |
66f0296e | 1945 | re_char *beg_interval; |
5e69f11e | 1946 | |
fa9a63c5 | 1947 | /* Address of the place where a forward jump should go to the end of |
25fe55af | 1948 | the containing expression. Each alternative of an `or' -- except the |
fa9a63c5 RM |
1949 | last -- ends with a forward jump of this sort. */ |
1950 | unsigned char *fixup_alt_jump = 0; | |
1951 | ||
1952 | /* Counts open-groups as they are encountered. Remembered for the | |
1953 | matching close-group on the compile stack, so the same register | |
1954 | number is put in the stop_memory as the start_memory. */ | |
1955 | regnum_t regnum = 0; | |
1956 | ||
b18215fc RS |
1957 | /* Work area for range table of charset. */ |
1958 | struct range_table_work_area range_table_work; | |
1959 | ||
fa9a63c5 | 1960 | #ifdef DEBUG |
99633e97 | 1961 | debug++; |
fa9a63c5 | 1962 | DEBUG_PRINT1 ("\nCompiling pattern: "); |
99633e97 | 1963 | if (debug > 0) |
fa9a63c5 RM |
1964 | { |
1965 | unsigned debug_count; | |
5e69f11e | 1966 | |
fa9a63c5 | 1967 | for (debug_count = 0; debug_count < size; debug_count++) |
25fe55af | 1968 | putchar (pattern[debug_count]); |
fa9a63c5 RM |
1969 | putchar ('\n'); |
1970 | } | |
1971 | #endif /* DEBUG */ | |
1972 | ||
1973 | /* Initialize the compile stack. */ | |
1974 | compile_stack.stack = TALLOC (INIT_COMPILE_STACK_SIZE, compile_stack_elt_t); | |
1975 | if (compile_stack.stack == NULL) | |
1976 | return REG_ESPACE; | |
1977 | ||
1978 | compile_stack.size = INIT_COMPILE_STACK_SIZE; | |
1979 | compile_stack.avail = 0; | |
1980 | ||
b18215fc RS |
1981 | range_table_work.table = 0; |
1982 | range_table_work.allocated = 0; | |
1983 | ||
fa9a63c5 RM |
1984 | /* Initialize the pattern buffer. */ |
1985 | bufp->syntax = syntax; | |
1986 | bufp->fastmap_accurate = 0; | |
1987 | bufp->not_bol = bufp->not_eol = 0; | |
1988 | ||
1989 | /* Set `used' to zero, so that if we return an error, the pattern | |
1990 | printer (for debugging) will think there's no pattern. We reset it | |
1991 | at the end. */ | |
1992 | bufp->used = 0; | |
5e69f11e | 1993 | |
fa9a63c5 | 1994 | /* Always count groups, whether or not bufp->no_sub is set. */ |
5e69f11e | 1995 | bufp->re_nsub = 0; |
fa9a63c5 | 1996 | |
b18215fc RS |
1997 | #ifdef emacs |
1998 | /* bufp->multibyte is set before regex_compile is called, so don't alter | |
1999 | it. */ | |
2000 | #else /* not emacs */ | |
2001 | /* Nothing is recognized as a multibyte character. */ | |
2002 | bufp->multibyte = 0; | |
2003 | #endif | |
2004 | ||
fa9a63c5 RM |
2005 | #if !defined (emacs) && !defined (SYNTAX_TABLE) |
2006 | /* Initialize the syntax table. */ | |
2007 | init_syntax_once (); | |
2008 | #endif | |
2009 | ||
2010 | if (bufp->allocated == 0) | |
2011 | { | |
2012 | if (bufp->buffer) | |
2013 | { /* If zero allocated, but buffer is non-null, try to realloc | |
25fe55af RS |
2014 | enough space. This loses if buffer's address is bogus, but |
2015 | that is the user's responsibility. */ | |
2016 | RETALLOC (bufp->buffer, INIT_BUF_SIZE, unsigned char); | |
2017 | } | |
fa9a63c5 | 2018 | else |
25fe55af RS |
2019 | { /* Caller did not allocate a buffer. Do it for them. */ |
2020 | bufp->buffer = TALLOC (INIT_BUF_SIZE, unsigned char); | |
2021 | } | |
fa9a63c5 RM |
2022 | if (!bufp->buffer) FREE_STACK_RETURN (REG_ESPACE); |
2023 | ||
2024 | bufp->allocated = INIT_BUF_SIZE; | |
2025 | } | |
2026 | ||
2027 | begalt = b = bufp->buffer; | |
2028 | ||
2029 | /* Loop through the uncompiled pattern until we're at the end. */ | |
2030 | while (p != pend) | |
2031 | { | |
2032 | PATFETCH (c); | |
2033 | ||
2034 | switch (c) | |
25fe55af RS |
2035 | { |
2036 | case '^': | |
2037 | { | |
2038 | if ( /* If at start of pattern, it's an operator. */ | |
2039 | p == pattern + 1 | |
2040 | /* If context independent, it's an operator. */ | |
2041 | || syntax & RE_CONTEXT_INDEP_ANCHORS | |
2042 | /* Otherwise, depends on what's come before. */ | |
2043 | || at_begline_loc_p (pattern, p, syntax)) | |
2044 | BUF_PUSH (begline); | |
2045 | else | |
2046 | goto normal_char; | |
2047 | } | |
2048 | break; | |
2049 | ||
2050 | ||
2051 | case '$': | |
2052 | { | |
2053 | if ( /* If at end of pattern, it's an operator. */ | |
2054 | p == pend | |
2055 | /* If context independent, it's an operator. */ | |
2056 | || syntax & RE_CONTEXT_INDEP_ANCHORS | |
2057 | /* Otherwise, depends on what's next. */ | |
2058 | || at_endline_loc_p (p, pend, syntax)) | |
2059 | BUF_PUSH (endline); | |
2060 | else | |
2061 | goto normal_char; | |
2062 | } | |
2063 | break; | |
fa9a63c5 RM |
2064 | |
2065 | ||
2066 | case '+': | |
25fe55af RS |
2067 | case '?': |
2068 | if ((syntax & RE_BK_PLUS_QM) | |
2069 | || (syntax & RE_LIMITED_OPS)) | |
2070 | goto normal_char; | |
2071 | handle_plus: | |
2072 | case '*': | |
2073 | /* If there is no previous pattern... */ | |
2074 | if (!laststart) | |
2075 | { | |
2076 | if (syntax & RE_CONTEXT_INVALID_OPS) | |
2077 | FREE_STACK_RETURN (REG_BADRPT); | |
2078 | else if (!(syntax & RE_CONTEXT_INDEP_OPS)) | |
2079 | goto normal_char; | |
2080 | } | |
2081 | ||
2082 | { | |
25fe55af | 2083 | /* 1 means zero (many) matches is allowed. */ |
66f0296e SM |
2084 | boolean zero_times_ok = 0, many_times_ok = 0; |
2085 | boolean greedy = 1; | |
25fe55af RS |
2086 | |
2087 | /* If there is a sequence of repetition chars, collapse it | |
2088 | down to just one (the right one). We can't combine | |
2089 | interval operators with these because of, e.g., `a{2}*', | |
2090 | which should only match an even number of `a's. */ | |
2091 | ||
2092 | for (;;) | |
2093 | { | |
1c8c6d39 DL |
2094 | if (!(syntax & RE_ALL_GREEDY) |
2095 | && c == '?' && (zero_times_ok || many_times_ok)) | |
2096 | greedy = 0; | |
2097 | else | |
2098 | { | |
2099 | zero_times_ok |= c != '+'; | |
2100 | many_times_ok |= c != '?'; | |
2101 | } | |
25fe55af RS |
2102 | |
2103 | if (p == pend) | |
2104 | break; | |
ed0767d8 SM |
2105 | else if (*p == '*' |
2106 | || (!(syntax & RE_BK_PLUS_QM) | |
2107 | && (*p == '+' || *p == '?'))) | |
25fe55af | 2108 | ; |
ed0767d8 | 2109 | else if (syntax & RE_BK_PLUS_QM && *p == '\\') |
25fe55af | 2110 | { |
ed0767d8 SM |
2111 | if (p+1 == pend) |
2112 | FREE_STACK_RETURN (REG_EESCAPE); | |
2113 | if (p[1] == '+' || p[1] == '?') | |
2114 | PATFETCH (c); /* Gobble up the backslash. */ | |
2115 | else | |
2116 | break; | |
25fe55af RS |
2117 | } |
2118 | else | |
ed0767d8 | 2119 | break; |
25fe55af | 2120 | /* If we get here, we found another repeat character. */ |
ed0767d8 SM |
2121 | PATFETCH (c); |
2122 | } | |
25fe55af RS |
2123 | |
2124 | /* Star, etc. applied to an empty pattern is equivalent | |
2125 | to an empty pattern. */ | |
4e8a9132 | 2126 | if (!laststart || laststart == b) |
25fe55af RS |
2127 | break; |
2128 | ||
2129 | /* Now we know whether or not zero matches is allowed | |
2130 | and also whether or not two or more matches is allowed. */ | |
1c8c6d39 DL |
2131 | if (greedy) |
2132 | { | |
99633e97 | 2133 | if (many_times_ok) |
4e8a9132 SM |
2134 | { |
2135 | boolean simple = skip_one_char (laststart) == b; | |
2136 | unsigned int startoffset = 0; | |
2137 | assert (skip_one_char (laststart) <= b); | |
2138 | ||
2139 | if (!zero_times_ok && simple) | |
2140 | { /* Since simple * loops can be made faster by using | |
2141 | on_failure_keep_string_jump, we turn simple P+ | |
2142 | into PP* if P is simple. */ | |
2143 | unsigned char *p1, *p2; | |
2144 | startoffset = b - laststart; | |
2145 | GET_BUFFER_SPACE (startoffset); | |
2146 | p1 = b; p2 = laststart; | |
2147 | while (p2 < p1) | |
2148 | *b++ = *p2++; | |
2149 | zero_times_ok = 1; | |
99633e97 | 2150 | } |
4e8a9132 SM |
2151 | |
2152 | GET_BUFFER_SPACE (6); | |
2153 | if (!zero_times_ok) | |
2154 | /* A + loop. */ | |
2155 | STORE_JUMP (on_failure_jump_loop, b, b + 6); | |
99633e97 | 2156 | else |
4e8a9132 SM |
2157 | /* Simple * loops can use on_failure_keep_string_jump |
2158 | depending on what follows. But since we don't know | |
2159 | that yet, we leave the decision up to | |
2160 | on_failure_jump_smart. */ | |
2161 | INSERT_JUMP (simple ? on_failure_jump_smart | |
2162 | : on_failure_jump_loop, | |
2163 | laststart + startoffset, b + 6); | |
99633e97 | 2164 | b += 3; |
4e8a9132 | 2165 | STORE_JUMP (jump, b, laststart + startoffset); |
99633e97 SM |
2166 | b += 3; |
2167 | } | |
2168 | else | |
2169 | { | |
4e8a9132 SM |
2170 | /* A simple ? pattern. */ |
2171 | assert (zero_times_ok); | |
2172 | GET_BUFFER_SPACE (3); | |
2173 | INSERT_JUMP (on_failure_jump, laststart, b + 3); | |
99633e97 SM |
2174 | b += 3; |
2175 | } | |
1c8c6d39 DL |
2176 | } |
2177 | else /* not greedy */ | |
2178 | { /* I wish the greedy and non-greedy cases could be merged. */ | |
2179 | ||
0683b6fa | 2180 | GET_BUFFER_SPACE (7); /* We might use less. */ |
1c8c6d39 DL |
2181 | if (many_times_ok) |
2182 | { | |
505bde11 | 2183 | /* The non-greedy multiple match looks like a repeat..until: |
1c8c6d39 | 2184 | we only need a conditional jump at the end of the loop */ |
0683b6fa SM |
2185 | BUF_PUSH (no_op); |
2186 | STORE_JUMP (on_failure_jump_nastyloop, b, laststart); | |
1c8c6d39 DL |
2187 | b += 3; |
2188 | if (zero_times_ok) | |
2189 | { | |
2190 | /* The repeat...until naturally matches one or more. | |
2191 | To also match zero times, we need to first jump to | |
2192 | the end of the loop (its conditional jump). */ | |
1c8c6d39 DL |
2193 | INSERT_JUMP (jump, laststart, b); |
2194 | b += 3; | |
2195 | } | |
2196 | } | |
2197 | else | |
2198 | { | |
2199 | /* non-greedy a?? */ | |
1c8c6d39 DL |
2200 | INSERT_JUMP (jump, laststart, b + 3); |
2201 | b += 3; | |
2202 | INSERT_JUMP (on_failure_jump, laststart, laststart + 6); | |
2203 | b += 3; | |
2204 | } | |
2205 | } | |
2206 | } | |
4e8a9132 | 2207 | pending_exact = 0; |
fa9a63c5 RM |
2208 | break; |
2209 | ||
2210 | ||
2211 | case '.': | |
25fe55af RS |
2212 | laststart = b; |
2213 | BUF_PUSH (anychar); | |
2214 | break; | |
fa9a63c5 RM |
2215 | |
2216 | ||
25fe55af RS |
2217 | case '[': |
2218 | { | |
b18215fc | 2219 | CLEAR_RANGE_TABLE_WORK_USED (range_table_work); |
fa9a63c5 | 2220 | |
25fe55af | 2221 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
fa9a63c5 | 2222 | |
25fe55af RS |
2223 | /* Ensure that we have enough space to push a charset: the |
2224 | opcode, the length count, and the bitset; 34 bytes in all. */ | |
fa9a63c5 RM |
2225 | GET_BUFFER_SPACE (34); |
2226 | ||
25fe55af | 2227 | laststart = b; |
e318085a | 2228 | |
25fe55af RS |
2229 | /* We test `*p == '^' twice, instead of using an if |
2230 | statement, so we only need one BUF_PUSH. */ | |
2231 | BUF_PUSH (*p == '^' ? charset_not : charset); | |
2232 | if (*p == '^') | |
2233 | p++; | |
e318085a | 2234 | |
25fe55af RS |
2235 | /* Remember the first position in the bracket expression. */ |
2236 | p1 = p; | |
e318085a | 2237 | |
25fe55af RS |
2238 | /* Push the number of bytes in the bitmap. */ |
2239 | BUF_PUSH ((1 << BYTEWIDTH) / BYTEWIDTH); | |
e318085a | 2240 | |
25fe55af RS |
2241 | /* Clear the whole map. */ |
2242 | bzero (b, (1 << BYTEWIDTH) / BYTEWIDTH); | |
e318085a | 2243 | |
25fe55af RS |
2244 | /* charset_not matches newline according to a syntax bit. */ |
2245 | if ((re_opcode_t) b[-2] == charset_not | |
2246 | && (syntax & RE_HAT_LISTS_NOT_NEWLINE)) | |
2247 | SET_LIST_BIT ('\n'); | |
fa9a63c5 | 2248 | |
25fe55af RS |
2249 | /* Read in characters and ranges, setting map bits. */ |
2250 | for (;;) | |
2251 | { | |
b18215fc RS |
2252 | int len; |
2253 | boolean escaped_char = false; | |
e318085a | 2254 | |
25fe55af | 2255 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
e318085a | 2256 | |
25fe55af | 2257 | PATFETCH (c); |
e318085a | 2258 | |
25fe55af RS |
2259 | /* \ might escape characters inside [...] and [^...]. */ |
2260 | if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\') | |
2261 | { | |
2262 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
e318085a RS |
2263 | |
2264 | PATFETCH (c); | |
b18215fc | 2265 | escaped_char = true; |
25fe55af | 2266 | } |
b18215fc RS |
2267 | else |
2268 | { | |
657fcfbd RS |
2269 | /* Could be the end of the bracket expression. If it's |
2270 | not (i.e., when the bracket expression is `[]' so | |
2271 | far), the ']' character bit gets set way below. */ | |
2272 | if (c == ']' && p != p1 + 1) | |
2273 | break; | |
25fe55af | 2274 | } |
b18215fc RS |
2275 | |
2276 | /* If C indicates start of multibyte char, get the | |
2277 | actual character code in C, and set the pattern | |
2278 | pointer P to the next character boundary. */ | |
2279 | if (bufp->multibyte && BASE_LEADING_CODE_P (c)) | |
2280 | { | |
2281 | PATUNFETCH; | |
2282 | c = STRING_CHAR_AND_LENGTH (p, pend - p, len); | |
2283 | p += len; | |
25fe55af | 2284 | } |
b18215fc RS |
2285 | /* What should we do for the character which is |
2286 | greater than 0x7F, but not BASE_LEADING_CODE_P? | |
2287 | XXX */ | |
2288 | ||
25fe55af RS |
2289 | /* See if we're at the beginning of a possible character |
2290 | class. */ | |
b18215fc RS |
2291 | |
2292 | else if (!escaped_char && | |
2293 | syntax & RE_CHAR_CLASSES && c == '[' && *p == ':') | |
657fcfbd RS |
2294 | { |
2295 | /* Leave room for the null. */ | |
25fe55af | 2296 | char str[CHAR_CLASS_MAX_LENGTH + 1]; |
ed0767d8 | 2297 | const unsigned char *class_beg; |
b18215fc | 2298 | |
25fe55af RS |
2299 | PATFETCH (c); |
2300 | c1 = 0; | |
ed0767d8 | 2301 | class_beg = p; |
b18215fc | 2302 | |
25fe55af RS |
2303 | /* If pattern is `[[:'. */ |
2304 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); | |
b18215fc | 2305 | |
25fe55af RS |
2306 | for (;;) |
2307 | { | |
2308 | PATFETCH (c); | |
2309 | if (c == ':' || c == ']' || p == pend | |
2310 | || c1 == CHAR_CLASS_MAX_LENGTH) | |
2311 | break; | |
2312 | str[c1++] = c; | |
2313 | } | |
2314 | str[c1] = '\0'; | |
b18215fc RS |
2315 | |
2316 | /* If isn't a word bracketed by `[:' and `:]': | |
2317 | undo the ending character, the letters, and | |
2318 | leave the leading `:' and `[' (but set bits for | |
2319 | them). */ | |
25fe55af RS |
2320 | if (c == ':' && *p == ']') |
2321 | { | |
2322 | int ch; | |
2323 | boolean is_alnum = STREQ (str, "alnum"); | |
2324 | boolean is_alpha = STREQ (str, "alpha"); | |
f71b19b6 | 2325 | boolean is_ascii = STREQ (str, "ascii"); |
25fe55af RS |
2326 | boolean is_blank = STREQ (str, "blank"); |
2327 | boolean is_cntrl = STREQ (str, "cntrl"); | |
2328 | boolean is_digit = STREQ (str, "digit"); | |
2329 | boolean is_graph = STREQ (str, "graph"); | |
2330 | boolean is_lower = STREQ (str, "lower"); | |
f71b19b6 DL |
2331 | boolean is_multibyte = STREQ (str, "multibyte"); |
2332 | boolean is_nonascii = STREQ (str, "nonascii"); | |
25fe55af RS |
2333 | boolean is_print = STREQ (str, "print"); |
2334 | boolean is_punct = STREQ (str, "punct"); | |
2335 | boolean is_space = STREQ (str, "space"); | |
f71b19b6 | 2336 | boolean is_unibyte = STREQ (str, "unibyte"); |
25fe55af | 2337 | boolean is_upper = STREQ (str, "upper"); |
96cc36cc | 2338 | boolean is_word = STREQ (str, "word"); |
f71b19b6 | 2339 | boolean is_xdigit = STREQ (str, "xdigit"); |
25fe55af RS |
2340 | |
2341 | if (!IS_CHAR_CLASS (str)) | |
fa9a63c5 RM |
2342 | FREE_STACK_RETURN (REG_ECTYPE); |
2343 | ||
25fe55af RS |
2344 | /* Throw away the ] at the end of the character |
2345 | class. */ | |
2346 | PATFETCH (c); | |
fa9a63c5 | 2347 | |
25fe55af | 2348 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
fa9a63c5 | 2349 | |
96cc36cc RS |
2350 | /* Most character classes in a multibyte match |
2351 | just set a flag. Exceptions are is_blank, | |
2352 | is_digit, is_cntrl, and is_xdigit, since | |
2353 | they can only match ASCII characters. We | |
2354 | don't need to handle them for multibyte. */ | |
2355 | ||
2356 | if (bufp->multibyte) | |
2357 | { | |
2358 | int bit = 0; | |
2359 | ||
2360 | if (is_alnum) bit = BIT_ALNUM; | |
2361 | if (is_alpha) bit = BIT_ALPHA; | |
f71b19b6 | 2362 | if (is_ascii) bit = BIT_ASCII; |
96cc36cc RS |
2363 | if (is_graph) bit = BIT_GRAPH; |
2364 | if (is_lower) bit = BIT_LOWER; | |
f71b19b6 DL |
2365 | if (is_multibyte) bit = BIT_MULTIBYTE; |
2366 | if (is_nonascii) bit = BIT_NONASCII; | |
96cc36cc RS |
2367 | if (is_print) bit = BIT_PRINT; |
2368 | if (is_punct) bit = BIT_PUNCT; | |
2369 | if (is_space) bit = BIT_SPACE; | |
f71b19b6 | 2370 | if (is_unibyte) bit = BIT_UNIBYTE; |
96cc36cc RS |
2371 | if (is_upper) bit = BIT_UPPER; |
2372 | if (is_word) bit = BIT_WORD; | |
2373 | if (bit) | |
2374 | SET_RANGE_TABLE_WORK_AREA_BIT (range_table_work, | |
2375 | bit); | |
2376 | } | |
2377 | ||
2378 | /* Handle character classes for ASCII characters. */ | |
25fe55af RS |
2379 | for (ch = 0; ch < 1 << BYTEWIDTH; ch++) |
2380 | { | |
7ae68633 | 2381 | int translated = TRANSLATE (ch); |
fa9a63c5 RM |
2382 | /* This was split into 3 if's to |
2383 | avoid an arbitrary limit in some compiler. */ | |
25fe55af RS |
2384 | if ( (is_alnum && ISALNUM (ch)) |
2385 | || (is_alpha && ISALPHA (ch)) | |
2386 | || (is_blank && ISBLANK (ch)) | |
2387 | || (is_cntrl && ISCNTRL (ch))) | |
7ae68633 | 2388 | SET_LIST_BIT (translated); |
fa9a63c5 | 2389 | if ( (is_digit && ISDIGIT (ch)) |
25fe55af RS |
2390 | || (is_graph && ISGRAPH (ch)) |
2391 | || (is_lower && ISLOWER (ch)) | |
2392 | || (is_print && ISPRINT (ch))) | |
7ae68633 | 2393 | SET_LIST_BIT (translated); |
fa9a63c5 | 2394 | if ( (is_punct && ISPUNCT (ch)) |
25fe55af RS |
2395 | || (is_space && ISSPACE (ch)) |
2396 | || (is_upper && ISUPPER (ch)) | |
2397 | || (is_xdigit && ISXDIGIT (ch))) | |
7ae68633 | 2398 | SET_LIST_BIT (translated); |
f71b19b6 DL |
2399 | if ( (is_ascii && IS_REAL_ASCII (ch)) |
2400 | || (is_nonascii && !IS_REAL_ASCII (ch)) | |
2401 | || (is_unibyte && ISUNIBYTE (ch)) | |
2402 | || (is_multibyte && !ISUNIBYTE (ch))) | |
2403 | SET_LIST_BIT (translated); | |
2404 | ||
96cc36cc RS |
2405 | if ( (is_word && ISWORD (ch))) |
2406 | SET_LIST_BIT (translated); | |
25fe55af | 2407 | } |
b18215fc RS |
2408 | |
2409 | /* Repeat the loop. */ | |
2410 | continue; | |
25fe55af RS |
2411 | } |
2412 | else | |
2413 | { | |
ed0767d8 SM |
2414 | /* Go back to right after the "[:". */ |
2415 | p = class_beg; | |
25fe55af | 2416 | SET_LIST_BIT ('['); |
b18215fc RS |
2417 | |
2418 | /* Because the `:' may starts the range, we | |
2419 | can't simply set bit and repeat the loop. | |
25fe55af | 2420 | Instead, just set it to C and handle below. */ |
b18215fc | 2421 | c = ':'; |
25fe55af RS |
2422 | } |
2423 | } | |
b18215fc RS |
2424 | |
2425 | if (p < pend && p[0] == '-' && p[1] != ']') | |
2426 | { | |
2427 | ||
2428 | /* Discard the `-'. */ | |
2429 | PATFETCH (c1); | |
2430 | ||
2431 | /* Fetch the character which ends the range. */ | |
2432 | PATFETCH (c1); | |
2433 | if (bufp->multibyte && BASE_LEADING_CODE_P (c1)) | |
e318085a | 2434 | { |
b18215fc RS |
2435 | PATUNFETCH; |
2436 | c1 = STRING_CHAR_AND_LENGTH (p, pend - p, len); | |
2437 | p += len; | |
e318085a | 2438 | } |
b18215fc | 2439 | |
e934739e RS |
2440 | if (SINGLE_BYTE_CHAR_P (c) |
2441 | && ! SINGLE_BYTE_CHAR_P (c1)) | |
2442 | { | |
2443 | /* Handle a range such as \177-\377 in multibyte mode. | |
2444 | Split that into two ranges,, | |
2445 | the low one ending at 0237, and the high one | |
2446 | starting at ...040. */ | |
505bde11 SM |
2447 | /* Unless I'm missing something, |
2448 | this line is useless. -sm | |
2449 | int c1_base = (c1 & ~0177) | 040; */ | |
e934739e RS |
2450 | SET_RANGE_TABLE_WORK_AREA (range_table_work, c, c1); |
2451 | c1 = 0237; | |
2452 | } | |
2453 | else if (!SAME_CHARSET_P (c, c1)) | |
b18215fc | 2454 | FREE_STACK_RETURN (REG_ERANGE); |
e318085a | 2455 | } |
25fe55af | 2456 | else |
b18215fc RS |
2457 | /* Range from C to C. */ |
2458 | c1 = c; | |
2459 | ||
2460 | /* Set the range ... */ | |
2461 | if (SINGLE_BYTE_CHAR_P (c)) | |
2462 | /* ... into bitmap. */ | |
25fe55af | 2463 | { |
b18215fc RS |
2464 | unsigned this_char; |
2465 | int range_start = c, range_end = c1; | |
2466 | ||
2467 | /* If the start is after the end, the range is empty. */ | |
2468 | if (range_start > range_end) | |
2469 | { | |
2470 | if (syntax & RE_NO_EMPTY_RANGES) | |
2471 | FREE_STACK_RETURN (REG_ERANGE); | |
2472 | /* Else, repeat the loop. */ | |
2473 | } | |
2474 | else | |
2475 | { | |
2476 | for (this_char = range_start; this_char <= range_end; | |
2477 | this_char++) | |
2478 | SET_LIST_BIT (TRANSLATE (this_char)); | |
e934739e | 2479 | } |
25fe55af | 2480 | } |
e318085a | 2481 | else |
b18215fc RS |
2482 | /* ... into range table. */ |
2483 | SET_RANGE_TABLE_WORK_AREA (range_table_work, c, c1); | |
e318085a RS |
2484 | } |
2485 | ||
25fe55af RS |
2486 | /* Discard any (non)matching list bytes that are all 0 at the |
2487 | end of the map. Decrease the map-length byte too. */ | |
2488 | while ((int) b[-1] > 0 && b[b[-1] - 1] == 0) | |
2489 | b[-1]--; | |
2490 | b += b[-1]; | |
fa9a63c5 | 2491 | |
96cc36cc RS |
2492 | /* Build real range table from work area. */ |
2493 | if (RANGE_TABLE_WORK_USED (range_table_work) | |
2494 | || RANGE_TABLE_WORK_BITS (range_table_work)) | |
b18215fc RS |
2495 | { |
2496 | int i; | |
2497 | int used = RANGE_TABLE_WORK_USED (range_table_work); | |
fa9a63c5 | 2498 | |
b18215fc | 2499 | /* Allocate space for COUNT + RANGE_TABLE. Needs two |
96cc36cc RS |
2500 | bytes for flags, two for COUNT, and three bytes for |
2501 | each character. */ | |
2502 | GET_BUFFER_SPACE (4 + used * 3); | |
fa9a63c5 | 2503 | |
b18215fc RS |
2504 | /* Indicate the existence of range table. */ |
2505 | laststart[1] |= 0x80; | |
fa9a63c5 | 2506 | |
96cc36cc RS |
2507 | /* Store the character class flag bits into the range table. |
2508 | If not in emacs, these flag bits are always 0. */ | |
2509 | *b++ = RANGE_TABLE_WORK_BITS (range_table_work) & 0xff; | |
2510 | *b++ = RANGE_TABLE_WORK_BITS (range_table_work) >> 8; | |
2511 | ||
b18215fc RS |
2512 | STORE_NUMBER_AND_INCR (b, used / 2); |
2513 | for (i = 0; i < used; i++) | |
2514 | STORE_CHARACTER_AND_INCR | |
2515 | (b, RANGE_TABLE_WORK_ELT (range_table_work, i)); | |
2516 | } | |
25fe55af RS |
2517 | } |
2518 | break; | |
fa9a63c5 RM |
2519 | |
2520 | ||
b18215fc | 2521 | case '(': |
25fe55af RS |
2522 | if (syntax & RE_NO_BK_PARENS) |
2523 | goto handle_open; | |
2524 | else | |
2525 | goto normal_char; | |
fa9a63c5 RM |
2526 | |
2527 | ||
25fe55af RS |
2528 | case ')': |
2529 | if (syntax & RE_NO_BK_PARENS) | |
2530 | goto handle_close; | |
2531 | else | |
2532 | goto normal_char; | |
e318085a RS |
2533 | |
2534 | ||
25fe55af RS |
2535 | case '\n': |
2536 | if (syntax & RE_NEWLINE_ALT) | |
2537 | goto handle_alt; | |
2538 | else | |
2539 | goto normal_char; | |
e318085a RS |
2540 | |
2541 | ||
b18215fc | 2542 | case '|': |
25fe55af RS |
2543 | if (syntax & RE_NO_BK_VBAR) |
2544 | goto handle_alt; | |
2545 | else | |
2546 | goto normal_char; | |
2547 | ||
2548 | ||
2549 | case '{': | |
2550 | if (syntax & RE_INTERVALS && syntax & RE_NO_BK_BRACES) | |
2551 | goto handle_interval; | |
2552 | else | |
2553 | goto normal_char; | |
2554 | ||
2555 | ||
2556 | case '\\': | |
2557 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
2558 | ||
2559 | /* Do not translate the character after the \, so that we can | |
2560 | distinguish, e.g., \B from \b, even if we normally would | |
2561 | translate, e.g., B to b. */ | |
2562 | PATFETCH_RAW (c); | |
2563 | ||
2564 | switch (c) | |
2565 | { | |
2566 | case '(': | |
2567 | if (syntax & RE_NO_BK_PARENS) | |
2568 | goto normal_backslash; | |
2569 | ||
2570 | handle_open: | |
505bde11 SM |
2571 | { |
2572 | int shy = 0; | |
2573 | if (p+1 < pend) | |
2574 | { | |
2575 | /* Look for a special (?...) construct */ | |
ed0767d8 | 2576 | if ((syntax & RE_SHY_GROUPS) && *p == '?') |
505bde11 | 2577 | { |
ed0767d8 | 2578 | PATFETCH (c); /* Gobble up the '?'. */ |
505bde11 SM |
2579 | PATFETCH (c); |
2580 | switch (c) | |
2581 | { | |
2582 | case ':': shy = 1; break; | |
2583 | default: | |
2584 | /* Only (?:...) is supported right now. */ | |
2585 | FREE_STACK_RETURN (REG_BADPAT); | |
2586 | } | |
2587 | } | |
505bde11 SM |
2588 | } |
2589 | ||
2590 | if (!shy) | |
2591 | { | |
2592 | bufp->re_nsub++; | |
2593 | regnum++; | |
2594 | } | |
25fe55af | 2595 | |
99633e97 SM |
2596 | if (COMPILE_STACK_FULL) |
2597 | { | |
2598 | RETALLOC (compile_stack.stack, compile_stack.size << 1, | |
2599 | compile_stack_elt_t); | |
2600 | if (compile_stack.stack == NULL) return REG_ESPACE; | |
25fe55af | 2601 | |
99633e97 SM |
2602 | compile_stack.size <<= 1; |
2603 | } | |
25fe55af | 2604 | |
99633e97 SM |
2605 | /* These are the values to restore when we hit end of this |
2606 | group. They are all relative offsets, so that if the | |
2607 | whole pattern moves because of realloc, they will still | |
2608 | be valid. */ | |
2609 | COMPILE_STACK_TOP.begalt_offset = begalt - bufp->buffer; | |
2610 | COMPILE_STACK_TOP.fixup_alt_jump | |
2611 | = fixup_alt_jump ? fixup_alt_jump - bufp->buffer + 1 : 0; | |
2612 | COMPILE_STACK_TOP.laststart_offset = b - bufp->buffer; | |
2613 | COMPILE_STACK_TOP.regnum = shy ? -regnum : regnum; | |
2614 | ||
2615 | /* Do not push a | |
2616 | start_memory for groups beyond the last one we can | |
2617 | represent in the compiled pattern. */ | |
2618 | if (regnum <= MAX_REGNUM && !shy) | |
2619 | BUF_PUSH_2 (start_memory, regnum); | |
2620 | ||
2621 | compile_stack.avail++; | |
2622 | ||
2623 | fixup_alt_jump = 0; | |
2624 | laststart = 0; | |
2625 | begalt = b; | |
2626 | /* If we've reached MAX_REGNUM groups, then this open | |
2627 | won't actually generate any code, so we'll have to | |
2628 | clear pending_exact explicitly. */ | |
2629 | pending_exact = 0; | |
2630 | break; | |
505bde11 | 2631 | } |
25fe55af RS |
2632 | |
2633 | case ')': | |
2634 | if (syntax & RE_NO_BK_PARENS) goto normal_backslash; | |
2635 | ||
2636 | if (COMPILE_STACK_EMPTY) | |
505bde11 SM |
2637 | { |
2638 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) | |
2639 | goto normal_backslash; | |
2640 | else | |
2641 | FREE_STACK_RETURN (REG_ERPAREN); | |
2642 | } | |
25fe55af RS |
2643 | |
2644 | handle_close: | |
505bde11 | 2645 | FIXUP_ALT_JUMP (); |
25fe55af RS |
2646 | |
2647 | /* See similar code for backslashed left paren above. */ | |
2648 | if (COMPILE_STACK_EMPTY) | |
505bde11 SM |
2649 | { |
2650 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) | |
2651 | goto normal_char; | |
2652 | else | |
2653 | FREE_STACK_RETURN (REG_ERPAREN); | |
2654 | } | |
25fe55af RS |
2655 | |
2656 | /* Since we just checked for an empty stack above, this | |
2657 | ``can't happen''. */ | |
2658 | assert (compile_stack.avail != 0); | |
2659 | { | |
2660 | /* We don't just want to restore into `regnum', because | |
2661 | later groups should continue to be numbered higher, | |
2662 | as in `(ab)c(de)' -- the second group is #2. */ | |
2663 | regnum_t this_group_regnum; | |
2664 | ||
2665 | compile_stack.avail--; | |
2666 | begalt = bufp->buffer + COMPILE_STACK_TOP.begalt_offset; | |
2667 | fixup_alt_jump | |
2668 | = COMPILE_STACK_TOP.fixup_alt_jump | |
2669 | ? bufp->buffer + COMPILE_STACK_TOP.fixup_alt_jump - 1 | |
2670 | : 0; | |
2671 | laststart = bufp->buffer + COMPILE_STACK_TOP.laststart_offset; | |
2672 | this_group_regnum = COMPILE_STACK_TOP.regnum; | |
b18215fc RS |
2673 | /* If we've reached MAX_REGNUM groups, then this open |
2674 | won't actually generate any code, so we'll have to | |
2675 | clear pending_exact explicitly. */ | |
2676 | pending_exact = 0; | |
e318085a | 2677 | |
25fe55af RS |
2678 | /* We're at the end of the group, so now we know how many |
2679 | groups were inside this one. */ | |
505bde11 SM |
2680 | if (this_group_regnum <= MAX_REGNUM && this_group_regnum > 0) |
2681 | BUF_PUSH_2 (stop_memory, this_group_regnum); | |
25fe55af RS |
2682 | } |
2683 | break; | |
2684 | ||
2685 | ||
2686 | case '|': /* `\|'. */ | |
2687 | if (syntax & RE_LIMITED_OPS || syntax & RE_NO_BK_VBAR) | |
2688 | goto normal_backslash; | |
2689 | handle_alt: | |
2690 | if (syntax & RE_LIMITED_OPS) | |
2691 | goto normal_char; | |
2692 | ||
2693 | /* Insert before the previous alternative a jump which | |
2694 | jumps to this alternative if the former fails. */ | |
2695 | GET_BUFFER_SPACE (3); | |
2696 | INSERT_JUMP (on_failure_jump, begalt, b + 6); | |
2697 | pending_exact = 0; | |
2698 | b += 3; | |
2699 | ||
2700 | /* The alternative before this one has a jump after it | |
2701 | which gets executed if it gets matched. Adjust that | |
2702 | jump so it will jump to this alternative's analogous | |
2703 | jump (put in below, which in turn will jump to the next | |
2704 | (if any) alternative's such jump, etc.). The last such | |
2705 | jump jumps to the correct final destination. A picture: | |
2706 | _____ _____ | |
2707 | | | | | | |
2708 | | v | v | |
2709 | a | b | c | |
2710 | ||
2711 | If we are at `b', then fixup_alt_jump right now points to a | |
2712 | three-byte space after `a'. We'll put in the jump, set | |
2713 | fixup_alt_jump to right after `b', and leave behind three | |
2714 | bytes which we'll fill in when we get to after `c'. */ | |
2715 | ||
505bde11 | 2716 | FIXUP_ALT_JUMP (); |
25fe55af RS |
2717 | |
2718 | /* Mark and leave space for a jump after this alternative, | |
2719 | to be filled in later either by next alternative or | |
2720 | when know we're at the end of a series of alternatives. */ | |
2721 | fixup_alt_jump = b; | |
2722 | GET_BUFFER_SPACE (3); | |
2723 | b += 3; | |
2724 | ||
2725 | laststart = 0; | |
2726 | begalt = b; | |
2727 | break; | |
2728 | ||
2729 | ||
2730 | case '{': | |
2731 | /* If \{ is a literal. */ | |
2732 | if (!(syntax & RE_INTERVALS) | |
2733 | /* If we're at `\{' and it's not the open-interval | |
2734 | operator. */ | |
ed0767d8 SM |
2735 | || (syntax & RE_NO_BK_BRACES) |
2736 | /* What is that? -sm */ | |
2737 | /* || (p - 2 == pattern && p == pend) */) | |
25fe55af RS |
2738 | goto normal_backslash; |
2739 | ||
2740 | handle_interval: | |
2741 | { | |
2742 | /* If got here, then the syntax allows intervals. */ | |
2743 | ||
2744 | /* At least (most) this many matches must be made. */ | |
99633e97 | 2745 | int lower_bound = 0, upper_bound = -1; |
25fe55af | 2746 | |
ed0767d8 | 2747 | beg_interval = p; |
25fe55af RS |
2748 | |
2749 | if (p == pend) | |
2750 | { | |
2751 | if (syntax & RE_NO_BK_BRACES) | |
2752 | goto unfetch_interval; | |
2753 | else | |
2754 | FREE_STACK_RETURN (REG_EBRACE); | |
2755 | } | |
2756 | ||
2757 | GET_UNSIGNED_NUMBER (lower_bound); | |
2758 | ||
2759 | if (c == ',') | |
ed0767d8 | 2760 | GET_UNSIGNED_NUMBER (upper_bound); |
25fe55af RS |
2761 | else |
2762 | /* Interval such as `{1}' => match exactly once. */ | |
2763 | upper_bound = lower_bound; | |
2764 | ||
2765 | if (lower_bound < 0 || upper_bound > RE_DUP_MAX | |
ed0767d8 | 2766 | || (upper_bound >= 0 && lower_bound > upper_bound)) |
25fe55af RS |
2767 | { |
2768 | if (syntax & RE_NO_BK_BRACES) | |
2769 | goto unfetch_interval; | |
2770 | else | |
2771 | FREE_STACK_RETURN (REG_BADBR); | |
2772 | } | |
2773 | ||
2774 | if (!(syntax & RE_NO_BK_BRACES)) | |
2775 | { | |
2776 | if (c != '\\') FREE_STACK_RETURN (REG_EBRACE); | |
2777 | ||
2778 | PATFETCH (c); | |
2779 | } | |
2780 | ||
2781 | if (c != '}') | |
2782 | { | |
2783 | if (syntax & RE_NO_BK_BRACES) | |
2784 | goto unfetch_interval; | |
2785 | else | |
2786 | FREE_STACK_RETURN (REG_BADBR); | |
2787 | } | |
2788 | ||
2789 | /* We just parsed a valid interval. */ | |
2790 | ||
2791 | /* If it's invalid to have no preceding re. */ | |
2792 | if (!laststart) | |
2793 | { | |
2794 | if (syntax & RE_CONTEXT_INVALID_OPS) | |
2795 | FREE_STACK_RETURN (REG_BADRPT); | |
2796 | else if (syntax & RE_CONTEXT_INDEP_OPS) | |
2797 | laststart = b; | |
2798 | else | |
2799 | goto unfetch_interval; | |
2800 | } | |
2801 | ||
25fe55af | 2802 | if (upper_bound == 0) |
ed0767d8 SM |
2803 | /* If the upper bound is zero, just drop the sub pattern |
2804 | altogether. */ | |
2805 | b = laststart; | |
2806 | else if (lower_bound == 1 && upper_bound == 1) | |
2807 | /* Just match it once: nothing to do here. */ | |
2808 | ; | |
25fe55af RS |
2809 | |
2810 | /* Otherwise, we have a nontrivial interval. When | |
2811 | we're all done, the pattern will look like: | |
2812 | set_number_at <jump count> <upper bound> | |
2813 | set_number_at <succeed_n count> <lower bound> | |
2814 | succeed_n <after jump addr> <succeed_n count> | |
2815 | <body of loop> | |
2816 | jump_n <succeed_n addr> <jump count> | |
2817 | (The upper bound and `jump_n' are omitted if | |
2818 | `upper_bound' is 1, though.) */ | |
2819 | else | |
2820 | { /* If the upper bound is > 1, we need to insert | |
2821 | more at the end of the loop. */ | |
ed0767d8 SM |
2822 | unsigned int nbytes = (upper_bound < 0 ? 3 |
2823 | : upper_bound > 1 ? 5 : 0); | |
2824 | unsigned int startoffset = 0; | |
2825 | ||
2826 | GET_BUFFER_SPACE (20); /* We might use less. */ | |
2827 | ||
2828 | if (lower_bound == 0) | |
2829 | { | |
2830 | /* A succeed_n that starts with 0 is really a | |
2831 | a simple on_failure_jump_loop. */ | |
2832 | INSERT_JUMP (on_failure_jump_loop, laststart, | |
2833 | b + 3 + nbytes); | |
2834 | b += 3; | |
2835 | } | |
2836 | else | |
2837 | { | |
2838 | /* Initialize lower bound of the `succeed_n', even | |
2839 | though it will be set during matching by its | |
2840 | attendant `set_number_at' (inserted next), | |
2841 | because `re_compile_fastmap' needs to know. | |
2842 | Jump to the `jump_n' we might insert below. */ | |
2843 | INSERT_JUMP2 (succeed_n, laststart, | |
2844 | b + 5 + nbytes, | |
2845 | lower_bound); | |
2846 | b += 5; | |
2847 | ||
2848 | /* Code to initialize the lower bound. Insert | |
2849 | before the `succeed_n'. The `5' is the last two | |
2850 | bytes of this `set_number_at', plus 3 bytes of | |
2851 | the following `succeed_n'. */ | |
2852 | insert_op2 (set_number_at, laststart, 5, lower_bound, b); | |
2853 | b += 5; | |
2854 | startoffset += 5; | |
2855 | } | |
2856 | ||
2857 | if (upper_bound < 0) | |
2858 | { | |
2859 | /* A negative upper bound stands for infinity, | |
2860 | in which case it degenerates to a plain jump. */ | |
2861 | STORE_JUMP (jump, b, laststart + startoffset); | |
2862 | b += 3; | |
2863 | } | |
2864 | else if (upper_bound > 1) | |
25fe55af RS |
2865 | { /* More than one repetition is allowed, so |
2866 | append a backward jump to the `succeed_n' | |
2867 | that starts this interval. | |
2868 | ||
2869 | When we've reached this during matching, | |
2870 | we'll have matched the interval once, so | |
2871 | jump back only `upper_bound - 1' times. */ | |
ed0767d8 | 2872 | STORE_JUMP2 (jump_n, b, laststart + startoffset, |
25fe55af RS |
2873 | upper_bound - 1); |
2874 | b += 5; | |
2875 | ||
2876 | /* The location we want to set is the second | |
2877 | parameter of the `jump_n'; that is `b-2' as | |
2878 | an absolute address. `laststart' will be | |
2879 | the `set_number_at' we're about to insert; | |
2880 | `laststart+3' the number to set, the source | |
2881 | for the relative address. But we are | |
2882 | inserting into the middle of the pattern -- | |
2883 | so everything is getting moved up by 5. | |
2884 | Conclusion: (b - 2) - (laststart + 3) + 5, | |
2885 | i.e., b - laststart. | |
2886 | ||
2887 | We insert this at the beginning of the loop | |
2888 | so that if we fail during matching, we'll | |
2889 | reinitialize the bounds. */ | |
2890 | insert_op2 (set_number_at, laststart, b - laststart, | |
2891 | upper_bound - 1, b); | |
2892 | b += 5; | |
2893 | } | |
2894 | } | |
2895 | pending_exact = 0; | |
2896 | beg_interval = NULL; | |
2897 | } | |
2898 | break; | |
2899 | ||
2900 | unfetch_interval: | |
2901 | /* If an invalid interval, match the characters as literals. */ | |
2902 | assert (beg_interval); | |
2903 | p = beg_interval; | |
2904 | beg_interval = NULL; | |
2905 | ||
2906 | /* normal_char and normal_backslash need `c'. */ | |
ed0767d8 | 2907 | c = '{'; |
25fe55af RS |
2908 | |
2909 | if (!(syntax & RE_NO_BK_BRACES)) | |
2910 | { | |
ed0767d8 SM |
2911 | assert (p > pattern && p[-1] == '\\'); |
2912 | goto normal_backslash; | |
25fe55af | 2913 | } |
ed0767d8 SM |
2914 | else |
2915 | goto normal_char; | |
e318085a | 2916 | |
b18215fc | 2917 | #ifdef emacs |
25fe55af RS |
2918 | /* There is no way to specify the before_dot and after_dot |
2919 | operators. rms says this is ok. --karl */ | |
2920 | case '=': | |
2921 | BUF_PUSH (at_dot); | |
2922 | break; | |
2923 | ||
2924 | case 's': | |
2925 | laststart = b; | |
2926 | PATFETCH (c); | |
2927 | BUF_PUSH_2 (syntaxspec, syntax_spec_code[c]); | |
2928 | break; | |
2929 | ||
2930 | case 'S': | |
2931 | laststart = b; | |
2932 | PATFETCH (c); | |
2933 | BUF_PUSH_2 (notsyntaxspec, syntax_spec_code[c]); | |
2934 | break; | |
b18215fc RS |
2935 | |
2936 | case 'c': | |
2937 | laststart = b; | |
2938 | PATFETCH_RAW (c); | |
2939 | BUF_PUSH_2 (categoryspec, c); | |
2940 | break; | |
e318085a | 2941 | |
b18215fc RS |
2942 | case 'C': |
2943 | laststart = b; | |
2944 | PATFETCH_RAW (c); | |
2945 | BUF_PUSH_2 (notcategoryspec, c); | |
2946 | break; | |
2947 | #endif /* emacs */ | |
e318085a | 2948 | |
e318085a | 2949 | |
25fe55af RS |
2950 | case 'w': |
2951 | laststart = b; | |
1fb352e0 | 2952 | BUF_PUSH_2 (syntaxspec, Sword); |
25fe55af | 2953 | break; |
e318085a | 2954 | |
e318085a | 2955 | |
25fe55af RS |
2956 | case 'W': |
2957 | laststart = b; | |
1fb352e0 | 2958 | BUF_PUSH_2 (notsyntaxspec, Sword); |
25fe55af | 2959 | break; |
e318085a RS |
2960 | |
2961 | ||
25fe55af RS |
2962 | case '<': |
2963 | BUF_PUSH (wordbeg); | |
2964 | break; | |
e318085a | 2965 | |
25fe55af RS |
2966 | case '>': |
2967 | BUF_PUSH (wordend); | |
2968 | break; | |
e318085a | 2969 | |
25fe55af RS |
2970 | case 'b': |
2971 | BUF_PUSH (wordbound); | |
2972 | break; | |
e318085a | 2973 | |
25fe55af RS |
2974 | case 'B': |
2975 | BUF_PUSH (notwordbound); | |
2976 | break; | |
fa9a63c5 | 2977 | |
25fe55af RS |
2978 | case '`': |
2979 | BUF_PUSH (begbuf); | |
2980 | break; | |
e318085a | 2981 | |
25fe55af RS |
2982 | case '\'': |
2983 | BUF_PUSH (endbuf); | |
2984 | break; | |
e318085a | 2985 | |
25fe55af RS |
2986 | case '1': case '2': case '3': case '4': case '5': |
2987 | case '6': case '7': case '8': case '9': | |
2988 | if (syntax & RE_NO_BK_REFS) | |
2989 | goto normal_char; | |
e318085a | 2990 | |
25fe55af | 2991 | c1 = c - '0'; |
e318085a | 2992 | |
25fe55af RS |
2993 | if (c1 > regnum) |
2994 | FREE_STACK_RETURN (REG_ESUBREG); | |
e318085a | 2995 | |
25fe55af RS |
2996 | /* Can't back reference to a subexpression if inside of it. */ |
2997 | if (group_in_compile_stack (compile_stack, c1)) | |
2998 | goto normal_char; | |
e318085a | 2999 | |
25fe55af RS |
3000 | laststart = b; |
3001 | BUF_PUSH_2 (duplicate, c1); | |
3002 | break; | |
e318085a | 3003 | |
e318085a | 3004 | |
25fe55af RS |
3005 | case '+': |
3006 | case '?': | |
3007 | if (syntax & RE_BK_PLUS_QM) | |
3008 | goto handle_plus; | |
3009 | else | |
3010 | goto normal_backslash; | |
3011 | ||
3012 | default: | |
3013 | normal_backslash: | |
3014 | /* You might think it would be useful for \ to mean | |
3015 | not to translate; but if we don't translate it | |
3016 | it will never match anything. */ | |
3017 | c = TRANSLATE (c); | |
3018 | goto normal_char; | |
3019 | } | |
3020 | break; | |
fa9a63c5 RM |
3021 | |
3022 | ||
3023 | default: | |
25fe55af | 3024 | /* Expects the character in `c'. */ |
fa9a63c5 | 3025 | normal_char: |
b18215fc RS |
3026 | p1 = p - 1; /* P1 points the head of C. */ |
3027 | #ifdef emacs | |
3028 | if (bufp->multibyte) | |
3583e969 KH |
3029 | { |
3030 | c = STRING_CHAR (p1, pend - p1); | |
3031 | c = TRANSLATE (c); | |
3032 | /* Set P to the next character boundary. */ | |
3033 | p += MULTIBYTE_FORM_LENGTH (p1, pend - p1) - 1; | |
3034 | } | |
b18215fc | 3035 | #endif |
fa9a63c5 | 3036 | /* If no exactn currently being built. */ |
25fe55af | 3037 | if (!pending_exact |
fa9a63c5 | 3038 | |
25fe55af RS |
3039 | /* If last exactn not at current position. */ |
3040 | || pending_exact + *pending_exact + 1 != b | |
5e69f11e | 3041 | |
25fe55af | 3042 | /* We have only one byte following the exactn for the count. */ |
b18215fc | 3043 | || *pending_exact >= (1 << BYTEWIDTH) - (p - p1) |
fa9a63c5 | 3044 | |
25fe55af | 3045 | /* If followed by a repetition operator. */ |
9d99031f | 3046 | || (p != pend && (*p == '*' || *p == '^')) |
fa9a63c5 | 3047 | || ((syntax & RE_BK_PLUS_QM) |
9d99031f RS |
3048 | ? p + 1 < pend && *p == '\\' && (p[1] == '+' || p[1] == '?') |
3049 | : p != pend && (*p == '+' || *p == '?')) | |
fa9a63c5 | 3050 | || ((syntax & RE_INTERVALS) |
25fe55af | 3051 | && ((syntax & RE_NO_BK_BRACES) |
9d99031f RS |
3052 | ? p != pend && *p == '{' |
3053 | : p + 1 < pend && p[0] == '\\' && p[1] == '{'))) | |
fa9a63c5 RM |
3054 | { |
3055 | /* Start building a new exactn. */ | |
5e69f11e | 3056 | |
25fe55af | 3057 | laststart = b; |
fa9a63c5 RM |
3058 | |
3059 | BUF_PUSH_2 (exactn, 0); | |
3060 | pending_exact = b - 1; | |
25fe55af | 3061 | } |
5e69f11e | 3062 | |
3583e969 KH |
3063 | #ifdef emacs |
3064 | if (! SINGLE_BYTE_CHAR_P (c)) | |
3065 | { | |
1c8c6d39 DL |
3066 | unsigned char str[MAX_MULTIBYTE_LENGTH]; |
3067 | int i = CHAR_STRING (c, str); | |
3583e969 KH |
3068 | int j; |
3069 | for (j = 0; j < i; j++) | |
3070 | { | |
3071 | BUF_PUSH (str[j]); | |
3072 | (*pending_exact)++; | |
3073 | } | |
3074 | } | |
3075 | else | |
3076 | #endif | |
b18215fc | 3077 | { |
e934739e RS |
3078 | BUF_PUSH (c); |
3079 | (*pending_exact)++; | |
b18215fc | 3080 | } |
fa9a63c5 | 3081 | break; |
25fe55af | 3082 | } /* switch (c) */ |
fa9a63c5 RM |
3083 | } /* while p != pend */ |
3084 | ||
5e69f11e | 3085 | |
fa9a63c5 | 3086 | /* Through the pattern now. */ |
5e69f11e | 3087 | |
505bde11 | 3088 | FIXUP_ALT_JUMP (); |
fa9a63c5 | 3089 | |
5e69f11e | 3090 | if (!COMPILE_STACK_EMPTY) |
fa9a63c5 RM |
3091 | FREE_STACK_RETURN (REG_EPAREN); |
3092 | ||
3093 | /* If we don't want backtracking, force success | |
3094 | the first time we reach the end of the compiled pattern. */ | |
3095 | if (syntax & RE_NO_POSIX_BACKTRACKING) | |
3096 | BUF_PUSH (succeed); | |
3097 | ||
3098 | free (compile_stack.stack); | |
3099 | ||
3100 | /* We have succeeded; set the length of the buffer. */ | |
3101 | bufp->used = b - bufp->buffer; | |
3102 | ||
3103 | #ifdef DEBUG | |
99633e97 | 3104 | if (debug > 0) |
fa9a63c5 | 3105 | { |
505bde11 | 3106 | re_compile_fastmap (bufp); |
fa9a63c5 RM |
3107 | DEBUG_PRINT1 ("\nCompiled pattern: \n"); |
3108 | print_compiled_pattern (bufp); | |
3109 | } | |
99633e97 | 3110 | debug--; |
fa9a63c5 RM |
3111 | #endif /* DEBUG */ |
3112 | ||
3113 | #ifndef MATCH_MAY_ALLOCATE | |
3114 | /* Initialize the failure stack to the largest possible stack. This | |
3115 | isn't necessary unless we're trying to avoid calling alloca in | |
3116 | the search and match routines. */ | |
3117 | { | |
3118 | int num_regs = bufp->re_nsub + 1; | |
3119 | ||
320a2a73 | 3120 | if (fail_stack.size < re_max_failures * TYPICAL_FAILURE_SIZE) |
fa9a63c5 | 3121 | { |
a26f4ccd | 3122 | fail_stack.size = re_max_failures * TYPICAL_FAILURE_SIZE; |
fa9a63c5 | 3123 | |
fa9a63c5 RM |
3124 | if (! fail_stack.stack) |
3125 | fail_stack.stack | |
5e69f11e | 3126 | = (fail_stack_elt_t *) malloc (fail_stack.size |
fa9a63c5 RM |
3127 | * sizeof (fail_stack_elt_t)); |
3128 | else | |
3129 | fail_stack.stack | |
3130 | = (fail_stack_elt_t *) realloc (fail_stack.stack, | |
3131 | (fail_stack.size | |
3132 | * sizeof (fail_stack_elt_t))); | |
fa9a63c5 RM |
3133 | } |
3134 | ||
3135 | regex_grow_registers (num_regs); | |
3136 | } | |
3137 | #endif /* not MATCH_MAY_ALLOCATE */ | |
3138 | ||
3139 | return REG_NOERROR; | |
3140 | } /* regex_compile */ | |
3141 | \f | |
3142 | /* Subroutines for `regex_compile'. */ | |
3143 | ||
25fe55af | 3144 | /* Store OP at LOC followed by two-byte integer parameter ARG. */ |
fa9a63c5 RM |
3145 | |
3146 | static void | |
3147 | store_op1 (op, loc, arg) | |
3148 | re_opcode_t op; | |
3149 | unsigned char *loc; | |
3150 | int arg; | |
3151 | { | |
3152 | *loc = (unsigned char) op; | |
3153 | STORE_NUMBER (loc + 1, arg); | |
3154 | } | |
3155 | ||
3156 | ||
3157 | /* Like `store_op1', but for two two-byte parameters ARG1 and ARG2. */ | |
3158 | ||
3159 | static void | |
3160 | store_op2 (op, loc, arg1, arg2) | |
3161 | re_opcode_t op; | |
3162 | unsigned char *loc; | |
3163 | int arg1, arg2; | |
3164 | { | |
3165 | *loc = (unsigned char) op; | |
3166 | STORE_NUMBER (loc + 1, arg1); | |
3167 | STORE_NUMBER (loc + 3, arg2); | |
3168 | } | |
3169 | ||
3170 | ||
3171 | /* Copy the bytes from LOC to END to open up three bytes of space at LOC | |
3172 | for OP followed by two-byte integer parameter ARG. */ | |
3173 | ||
3174 | static void | |
3175 | insert_op1 (op, loc, arg, end) | |
3176 | re_opcode_t op; | |
3177 | unsigned char *loc; | |
3178 | int arg; | |
5e69f11e | 3179 | unsigned char *end; |
fa9a63c5 RM |
3180 | { |
3181 | register unsigned char *pfrom = end; | |
3182 | register unsigned char *pto = end + 3; | |
3183 | ||
3184 | while (pfrom != loc) | |
3185 | *--pto = *--pfrom; | |
5e69f11e | 3186 | |
fa9a63c5 RM |
3187 | store_op1 (op, loc, arg); |
3188 | } | |
3189 | ||
3190 | ||
3191 | /* Like `insert_op1', but for two two-byte parameters ARG1 and ARG2. */ | |
3192 | ||
3193 | static void | |
3194 | insert_op2 (op, loc, arg1, arg2, end) | |
3195 | re_opcode_t op; | |
3196 | unsigned char *loc; | |
3197 | int arg1, arg2; | |
5e69f11e | 3198 | unsigned char *end; |
fa9a63c5 RM |
3199 | { |
3200 | register unsigned char *pfrom = end; | |
3201 | register unsigned char *pto = end + 5; | |
3202 | ||
3203 | while (pfrom != loc) | |
3204 | *--pto = *--pfrom; | |
5e69f11e | 3205 | |
fa9a63c5 RM |
3206 | store_op2 (op, loc, arg1, arg2); |
3207 | } | |
3208 | ||
3209 | ||
3210 | /* P points to just after a ^ in PATTERN. Return true if that ^ comes | |
3211 | after an alternative or a begin-subexpression. We assume there is at | |
3212 | least one character before the ^. */ | |
3213 | ||
3214 | static boolean | |
3215 | at_begline_loc_p (pattern, p, syntax) | |
99633e97 | 3216 | const unsigned char *pattern, *p; |
fa9a63c5 RM |
3217 | reg_syntax_t syntax; |
3218 | { | |
4e8a9132 | 3219 | const unsigned char *prev = p - 2; |
fa9a63c5 | 3220 | boolean prev_prev_backslash = prev > pattern && prev[-1] == '\\'; |
5e69f11e | 3221 | |
fa9a63c5 RM |
3222 | return |
3223 | /* After a subexpression? */ | |
3224 | (*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash)) | |
25fe55af | 3225 | /* After an alternative? */ |
fa9a63c5 RM |
3226 | || (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash)); |
3227 | } | |
3228 | ||
3229 | ||
3230 | /* The dual of at_begline_loc_p. This one is for $. We assume there is | |
3231 | at least one character after the $, i.e., `P < PEND'. */ | |
3232 | ||
3233 | static boolean | |
3234 | at_endline_loc_p (p, pend, syntax) | |
99633e97 SM |
3235 | const unsigned char *p, *pend; |
3236 | reg_syntax_t syntax; | |
fa9a63c5 | 3237 | { |
4e8a9132 | 3238 | const unsigned char *next = p; |
fa9a63c5 | 3239 | boolean next_backslash = *next == '\\'; |
4e8a9132 | 3240 | const unsigned char *next_next = p + 1 < pend ? p + 1 : 0; |
5e69f11e | 3241 | |
fa9a63c5 RM |
3242 | return |
3243 | /* Before a subexpression? */ | |
3244 | (syntax & RE_NO_BK_PARENS ? *next == ')' | |
25fe55af | 3245 | : next_backslash && next_next && *next_next == ')') |
fa9a63c5 RM |
3246 | /* Before an alternative? */ |
3247 | || (syntax & RE_NO_BK_VBAR ? *next == '|' | |
25fe55af | 3248 | : next_backslash && next_next && *next_next == '|'); |
fa9a63c5 RM |
3249 | } |
3250 | ||
3251 | ||
5e69f11e | 3252 | /* Returns true if REGNUM is in one of COMPILE_STACK's elements and |
fa9a63c5 RM |
3253 | false if it's not. */ |
3254 | ||
3255 | static boolean | |
3256 | group_in_compile_stack (compile_stack, regnum) | |
3257 | compile_stack_type compile_stack; | |
3258 | regnum_t regnum; | |
3259 | { | |
3260 | int this_element; | |
3261 | ||
5e69f11e RM |
3262 | for (this_element = compile_stack.avail - 1; |
3263 | this_element >= 0; | |
fa9a63c5 RM |
3264 | this_element--) |
3265 | if (compile_stack.stack[this_element].regnum == regnum) | |
3266 | return true; | |
3267 | ||
3268 | return false; | |
3269 | } | |
fa9a63c5 RM |
3270 | \f |
3271 | /* re_compile_fastmap computes a ``fastmap'' for the compiled pattern in | |
3272 | BUFP. A fastmap records which of the (1 << BYTEWIDTH) possible | |
3273 | characters can start a string that matches the pattern. This fastmap | |
3274 | is used by re_search to skip quickly over impossible starting points. | |
3275 | ||
96cc36cc RS |
3276 | Character codes above (1 << BYTEWIDTH) are not represented in the |
3277 | fastmap, but the leading codes are represented. Thus, the fastmap | |
3278 | indicates which character sets could start a match. | |
3279 | ||
fa9a63c5 RM |
3280 | The caller must supply the address of a (1 << BYTEWIDTH)-byte data |
3281 | area as BUFP->fastmap. | |
5e69f11e | 3282 | |
fa9a63c5 RM |
3283 | We set the `fastmap', `fastmap_accurate', and `can_be_null' fields in |
3284 | the pattern buffer. | |
3285 | ||
3286 | Returns 0 if we succeed, -2 if an internal error. */ | |
3287 | ||
3288 | int | |
3289 | re_compile_fastmap (bufp) | |
3290 | struct re_pattern_buffer *bufp; | |
3291 | { | |
505bde11 | 3292 | int j, k; |
1fb352e0 | 3293 | boolean not; |
fa9a63c5 RM |
3294 | #ifdef MATCH_MAY_ALLOCATE |
3295 | fail_stack_type fail_stack; | |
3296 | #endif | |
3297 | #ifndef REGEX_MALLOC | |
3298 | char *destination; | |
3299 | #endif | |
5e69f11e | 3300 | |
fa9a63c5 RM |
3301 | register char *fastmap = bufp->fastmap; |
3302 | unsigned char *pattern = bufp->buffer; | |
3303 | unsigned long size = bufp->used; | |
3304 | unsigned char *p = pattern; | |
3305 | register unsigned char *pend = pattern + size; | |
1fb352e0 | 3306 | const boolean multibyte = bufp->multibyte; |
fa9a63c5 | 3307 | |
99633e97 | 3308 | #if defined (REL_ALLOC) && defined (REGEX_MALLOC) |
fa9a63c5 RM |
3309 | /* This holds the pointer to the failure stack, when |
3310 | it is allocated relocatably. */ | |
3311 | fail_stack_elt_t *failure_stack_ptr; | |
99633e97 | 3312 | #endif |
fa9a63c5 RM |
3313 | |
3314 | /* Assume that each path through the pattern can be null until | |
25fe55af | 3315 | proven otherwise. We set this false at the bottom of switch |
fa9a63c5 RM |
3316 | statement, to which we get only if a particular path doesn't |
3317 | match the empty string. */ | |
3318 | boolean path_can_be_null = true; | |
3319 | ||
b18215fc | 3320 | /* If all elements for base leading-codes in fastmap is set, this |
25fe55af | 3321 | flag is set true. */ |
b18215fc RS |
3322 | boolean match_any_multibyte_characters = false; |
3323 | ||
fa9a63c5 | 3324 | assert (fastmap != NULL && p != NULL); |
5e69f11e | 3325 | |
fa9a63c5 | 3326 | INIT_FAIL_STACK (); |
25fe55af | 3327 | bzero (fastmap, 1 << BYTEWIDTH); /* Assume nothing's valid. */ |
fa9a63c5 RM |
3328 | bufp->fastmap_accurate = 1; /* It will be when we're done. */ |
3329 | bufp->can_be_null = 0; | |
5e69f11e | 3330 | |
505bde11 SM |
3331 | /* The loop below works as follows: |
3332 | - It has a working-list kept in the PATTERN_STACK and which basically | |
3333 | starts by only containing a pointer to the first operation. | |
3334 | - If the opcode we're looking at is a match against some set of | |
3335 | chars, then we add those chars to the fastmap and go on to the | |
3336 | next work element from the worklist (done via `break'). | |
3337 | - If the opcode is a control operator on the other hand, we either | |
3338 | ignore it (if it's meaningless at this point, such as `start_memory') | |
3339 | or execute it (if it's a jump). If the jump has several destinations | |
3340 | (i.e. `on_failure_jump'), then we push the other destination onto the | |
3341 | worklist. | |
3342 | We guarantee termination by ignoring backward jumps (more or less), | |
3343 | so that `p' is monotonically increasing. More to the point, we | |
3344 | never set `p' (or push) anything `<= p1'. */ | |
3345 | ||
3346 | /* If can_be_null is set, then the fastmap will not be used anyway. */ | |
3347 | while (!bufp->can_be_null) | |
fa9a63c5 | 3348 | { |
505bde11 SM |
3349 | /* `p1' is used as a marker of how far back a `on_failure_jump' |
3350 | can go without being ignored. It is normally equal to `p' | |
3351 | (which prevents any backward `on_failure_jump') except right | |
3352 | after a plain `jump', to allow patterns such as: | |
3353 | 0: jump 10 | |
3354 | 3..9: <body> | |
3355 | 10: on_failure_jump 3 | |
3356 | as used for the *? operator. */ | |
3357 | unsigned char *p1 = p; | |
3358 | ||
ed0767d8 | 3359 | if (p >= pend || *p == succeed) |
fa9a63c5 RM |
3360 | { |
3361 | /* We have reached the (effective) end of pattern. */ | |
505bde11 | 3362 | if (!PATTERN_STACK_EMPTY ()) |
fa9a63c5 RM |
3363 | { |
3364 | bufp->can_be_null |= path_can_be_null; | |
3365 | ||
3366 | /* Reset for next path. */ | |
3367 | path_can_be_null = true; | |
3368 | ||
66f0296e | 3369 | p = (unsigned char*) POP_PATTERN_OP (); |
fa9a63c5 RM |
3370 | |
3371 | continue; | |
3372 | } | |
3373 | else | |
3374 | break; | |
3375 | } | |
3376 | ||
25fe55af | 3377 | /* We should never be about to go beyond the end of the pattern. */ |
fa9a63c5 | 3378 | assert (p < pend); |
5e69f11e | 3379 | |
fa9a63c5 RM |
3380 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++)) |
3381 | { | |
3382 | ||
fa9a63c5 | 3383 | case duplicate: |
505bde11 SM |
3384 | /* If the first character has to match a backreference, that means |
3385 | that the group was empty (since it already matched). Since this | |
3386 | is the only case that interests us here, we can assume that the | |
3387 | backreference must match the empty string. */ | |
3388 | p++; | |
3389 | continue; | |
fa9a63c5 RM |
3390 | |
3391 | ||
3392 | /* Following are the cases which match a character. These end | |
25fe55af | 3393 | with `break'. */ |
fa9a63c5 RM |
3394 | |
3395 | case exactn: | |
25fe55af | 3396 | fastmap[p[1]] = 1; |
fa9a63c5 RM |
3397 | break; |
3398 | ||
3399 | ||
1fb352e0 SM |
3400 | case anychar: |
3401 | /* We could put all the chars except for \n (and maybe \0) | |
3402 | but we don't bother since it is generally not worth it. */ | |
3403 | bufp->can_be_null = 1; | |
3404 | continue; | |
fa9a63c5 RM |
3405 | |
3406 | ||
b18215fc | 3407 | case charset_not: |
ba5c004d RS |
3408 | /* Chars beyond end of bitmap are possible matches. |
3409 | All the single-byte codes can occur in multibyte buffers. | |
3410 | So any that are not listed in the charset | |
3411 | are possible matches, even in multibyte buffers. */ | |
1fb352e0 | 3412 | if (!fastmap) break; |
b18215fc | 3413 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH; |
1fb352e0 | 3414 | j < (1 << BYTEWIDTH); j++) |
b18215fc | 3415 | fastmap[j] = 1; |
1fb352e0 SM |
3416 | /* Fallthrough */ |
3417 | case charset: | |
3418 | if (!fastmap) break; | |
3419 | not = (re_opcode_t) *(p - 1) == charset_not; | |
b18215fc RS |
3420 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH - 1, p++; |
3421 | j >= 0; j--) | |
1fb352e0 | 3422 | if (!!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))) ^ not) |
b18215fc RS |
3423 | fastmap[j] = 1; |
3424 | ||
1fb352e0 SM |
3425 | if ((not && multibyte) |
3426 | /* Any character set can possibly contain a character | |
3427 | which doesn't match the specified set of characters. */ | |
3428 | || (CHARSET_RANGE_TABLE_EXISTS_P (&p[-2]) | |
3429 | && CHARSET_RANGE_TABLE_BITS (&p[-2]) != 0)) | |
3430 | /* If we can match a character class, we can match | |
3431 | any character set. */ | |
b18215fc RS |
3432 | { |
3433 | set_fastmap_for_multibyte_characters: | |
3434 | if (match_any_multibyte_characters == false) | |
3435 | { | |
3436 | for (j = 0x80; j < 0xA0; j++) /* XXX */ | |
3437 | if (BASE_LEADING_CODE_P (j)) | |
3438 | fastmap[j] = 1; | |
3439 | match_any_multibyte_characters = true; | |
3440 | } | |
3441 | } | |
b18215fc | 3442 | |
1fb352e0 SM |
3443 | else if (!not && CHARSET_RANGE_TABLE_EXISTS_P (&p[-2]) |
3444 | && match_any_multibyte_characters == false) | |
3445 | { | |
3446 | /* Set fastmap[I] 1 where I is a base leading code of each | |
3447 | multibyte character in the range table. */ | |
3448 | int c, count; | |
b18215fc | 3449 | |
1fb352e0 SM |
3450 | /* Make P points the range table. `+ 2' is to skip flag |
3451 | bits for a character class. */ | |
3452 | p += CHARSET_BITMAP_SIZE (&p[-2]) + 2; | |
b18215fc | 3453 | |
1fb352e0 SM |
3454 | /* Extract the number of ranges in range table into COUNT. */ |
3455 | EXTRACT_NUMBER_AND_INCR (count, p); | |
3456 | for (; count > 0; count--, p += 2 * 3) /* XXX */ | |
3457 | { | |
3458 | /* Extract the start of each range. */ | |
3459 | EXTRACT_CHARACTER (c, p); | |
3460 | j = CHAR_CHARSET (c); | |
3461 | fastmap[CHARSET_LEADING_CODE_BASE (j)] = 1; | |
3462 | } | |
3463 | } | |
b18215fc RS |
3464 | break; |
3465 | ||
1fb352e0 SM |
3466 | case syntaxspec: |
3467 | case notsyntaxspec: | |
3468 | if (!fastmap) break; | |
3469 | #ifndef emacs | |
3470 | not = (re_opcode_t)p[-1] == notsyntaxspec; | |
3471 | k = *p++; | |
3472 | for (j = 0; j < (1 << BYTEWIDTH); j++) | |
990b2375 | 3473 | if ((SYNTAX (j) == (enum syntaxcode) k) ^ not) |
b18215fc | 3474 | fastmap[j] = 1; |
b18215fc | 3475 | break; |
1fb352e0 | 3476 | #else /* emacs */ |
b18215fc RS |
3477 | /* This match depends on text properties. These end with |
3478 | aborting optimizations. */ | |
3479 | bufp->can_be_null = 1; | |
505bde11 | 3480 | continue; |
b18215fc RS |
3481 | |
3482 | case categoryspec: | |
b18215fc | 3483 | case notcategoryspec: |
1fb352e0 SM |
3484 | if (!fastmap) break; |
3485 | not = (re_opcode_t)p[-1] == notcategoryspec; | |
b18215fc | 3486 | k = *p++; |
1fb352e0 SM |
3487 | for (j = 0; j < (1 << BYTEWIDTH); j++) |
3488 | if ((CHAR_HAS_CATEGORY (j, k)) ^ not) | |
b18215fc RS |
3489 | fastmap[j] = 1; |
3490 | ||
1fb352e0 | 3491 | if (multibyte) |
b18215fc | 3492 | /* Any character set can possibly contain a character |
1fb352e0 | 3493 | whose category is K (or not). */ |
b18215fc RS |
3494 | goto set_fastmap_for_multibyte_characters; |
3495 | break; | |
3496 | ||
fa9a63c5 | 3497 | /* All cases after this match the empty string. These end with |
25fe55af | 3498 | `continue'. */ |
fa9a63c5 | 3499 | |
fa9a63c5 RM |
3500 | case before_dot: |
3501 | case at_dot: | |
3502 | case after_dot: | |
1fb352e0 | 3503 | #endif /* !emacs */ |
25fe55af RS |
3504 | case no_op: |
3505 | case begline: | |
3506 | case endline: | |
fa9a63c5 RM |
3507 | case begbuf: |
3508 | case endbuf: | |
3509 | case wordbound: | |
3510 | case notwordbound: | |
3511 | case wordbeg: | |
3512 | case wordend: | |
25fe55af | 3513 | continue; |
fa9a63c5 RM |
3514 | |
3515 | ||
fa9a63c5 | 3516 | case jump: |
25fe55af | 3517 | EXTRACT_NUMBER_AND_INCR (j, p); |
505bde11 SM |
3518 | if (j < 0) |
3519 | /* Backward jumps can only go back to code that we've already | |
3520 | visited. `re_compile' should make sure this is true. */ | |
3521 | break; | |
25fe55af | 3522 | p += j; |
505bde11 SM |
3523 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p)) |
3524 | { | |
3525 | case on_failure_jump: | |
3526 | case on_failure_keep_string_jump: | |
505bde11 | 3527 | case on_failure_jump_loop: |
0683b6fa | 3528 | case on_failure_jump_nastyloop: |
505bde11 SM |
3529 | case on_failure_jump_smart: |
3530 | p++; | |
3531 | break; | |
3532 | default: | |
3533 | continue; | |
3534 | }; | |
3535 | /* Keep `p1' to allow the `on_failure_jump' we are jumping to | |
3536 | to jump back to "just after here". */ | |
3537 | /* Fallthrough */ | |
fa9a63c5 | 3538 | |
25fe55af RS |
3539 | case on_failure_jump: |
3540 | case on_failure_keep_string_jump: | |
0683b6fa | 3541 | case on_failure_jump_nastyloop: |
505bde11 SM |
3542 | case on_failure_jump_loop: |
3543 | case on_failure_jump_smart: | |
25fe55af | 3544 | EXTRACT_NUMBER_AND_INCR (j, p); |
505bde11 | 3545 | if (p + j <= p1) |
ed0767d8 SM |
3546 | ; /* Backward jump to be ignored. */ |
3547 | else if (!PUSH_PATTERN_OP (p + j, fail_stack)) | |
3548 | return (RESET_FAIL_STACK (), -2); | |
25fe55af | 3549 | continue; |
fa9a63c5 RM |
3550 | |
3551 | ||
ed0767d8 SM |
3552 | case jump_n: |
3553 | /* This code simply does not properly handle forward jump_n. */ | |
3554 | DEBUG_STATEMENT (EXTRACT_NUMBER (j, p); assert (j < 0)); | |
3555 | p += 4; | |
3556 | /* jump_n can either jump or fall through. The (backward) jump | |
3557 | case has already been handled, so we only need to look at the | |
3558 | fallthrough case. */ | |
3559 | continue; | |
3560 | ||
fa9a63c5 | 3561 | case succeed_n: |
ed0767d8 SM |
3562 | /* If N == 0, it should be an on_failure_jump_loop instead. */ |
3563 | DEBUG_STATEMENT (EXTRACT_NUMBER (j, p + 2); assert (j > 0)); | |
3564 | p += 4; | |
3565 | /* We only care about one iteration of the loop, so we don't | |
3566 | need to consider the case where this behaves like an | |
3567 | on_failure_jump. */ | |
25fe55af | 3568 | continue; |
fa9a63c5 RM |
3569 | |
3570 | ||
3571 | case set_number_at: | |
25fe55af RS |
3572 | p += 4; |
3573 | continue; | |
fa9a63c5 RM |
3574 | |
3575 | ||
3576 | case start_memory: | |
25fe55af | 3577 | case stop_memory: |
505bde11 | 3578 | p += 1; |
fa9a63c5 RM |
3579 | continue; |
3580 | ||
3581 | ||
3582 | default: | |
25fe55af RS |
3583 | abort (); /* We have listed all the cases. */ |
3584 | } /* switch *p++ */ | |
fa9a63c5 RM |
3585 | |
3586 | /* Getting here means we have found the possible starting | |
25fe55af RS |
3587 | characters for one path of the pattern -- and that the empty |
3588 | string does not match. We need not follow this path further. | |
3589 | Instead, look at the next alternative (remembered on the | |
3590 | stack), or quit if no more. The test at the top of the loop | |
3591 | does these things. */ | |
fa9a63c5 RM |
3592 | path_can_be_null = false; |
3593 | p = pend; | |
3594 | } /* while p */ | |
3595 | ||
3596 | /* Set `can_be_null' for the last path (also the first path, if the | |
25fe55af | 3597 | pattern is empty). */ |
fa9a63c5 | 3598 | bufp->can_be_null |= path_can_be_null; |
fa9a63c5 RM |
3599 | RESET_FAIL_STACK (); |
3600 | return 0; | |
3601 | } /* re_compile_fastmap */ | |
3602 | \f | |
3603 | /* Set REGS to hold NUM_REGS registers, storing them in STARTS and | |
3604 | ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use | |
3605 | this memory for recording register information. STARTS and ENDS | |
3606 | must be allocated using the malloc library routine, and must each | |
3607 | be at least NUM_REGS * sizeof (regoff_t) bytes long. | |
3608 | ||
3609 | If NUM_REGS == 0, then subsequent matches should allocate their own | |
3610 | register data. | |
3611 | ||
3612 | Unless this function is called, the first search or match using | |
3613 | PATTERN_BUFFER will allocate its own register data, without | |
3614 | freeing the old data. */ | |
3615 | ||
3616 | void | |
3617 | re_set_registers (bufp, regs, num_regs, starts, ends) | |
3618 | struct re_pattern_buffer *bufp; | |
3619 | struct re_registers *regs; | |
3620 | unsigned num_regs; | |
3621 | regoff_t *starts, *ends; | |
3622 | { | |
3623 | if (num_regs) | |
3624 | { | |
3625 | bufp->regs_allocated = REGS_REALLOCATE; | |
3626 | regs->num_regs = num_regs; | |
3627 | regs->start = starts; | |
3628 | regs->end = ends; | |
3629 | } | |
3630 | else | |
3631 | { | |
3632 | bufp->regs_allocated = REGS_UNALLOCATED; | |
3633 | regs->num_regs = 0; | |
3634 | regs->start = regs->end = (regoff_t *) 0; | |
3635 | } | |
3636 | } | |
3637 | \f | |
25fe55af | 3638 | /* Searching routines. */ |
fa9a63c5 RM |
3639 | |
3640 | /* Like re_search_2, below, but only one string is specified, and | |
3641 | doesn't let you say where to stop matching. */ | |
3642 | ||
3643 | int | |
3644 | re_search (bufp, string, size, startpos, range, regs) | |
3645 | struct re_pattern_buffer *bufp; | |
3646 | const char *string; | |
3647 | int size, startpos, range; | |
3648 | struct re_registers *regs; | |
3649 | { | |
5e69f11e | 3650 | return re_search_2 (bufp, NULL, 0, string, size, startpos, range, |
fa9a63c5 RM |
3651 | regs, size); |
3652 | } | |
3653 | ||
b18215fc RS |
3654 | /* End address of virtual concatenation of string. */ |
3655 | #define STOP_ADDR_VSTRING(P) \ | |
3656 | (((P) >= size1 ? string2 + size2 : string1 + size1)) | |
3657 | ||
3658 | /* Address of POS in the concatenation of virtual string. */ | |
3659 | #define POS_ADDR_VSTRING(POS) \ | |
3660 | (((POS) >= size1 ? string2 - size1 : string1) + (POS)) | |
fa9a63c5 RM |
3661 | |
3662 | /* Using the compiled pattern in BUFP->buffer, first tries to match the | |
3663 | virtual concatenation of STRING1 and STRING2, starting first at index | |
3664 | STARTPOS, then at STARTPOS + 1, and so on. | |
5e69f11e | 3665 | |
fa9a63c5 | 3666 | STRING1 and STRING2 have length SIZE1 and SIZE2, respectively. |
5e69f11e | 3667 | |
fa9a63c5 RM |
3668 | RANGE is how far to scan while trying to match. RANGE = 0 means try |
3669 | only at STARTPOS; in general, the last start tried is STARTPOS + | |
3670 | RANGE. | |
5e69f11e | 3671 | |
fa9a63c5 RM |
3672 | In REGS, return the indices of the virtual concatenation of STRING1 |
3673 | and STRING2 that matched the entire BUFP->buffer and its contained | |
3674 | subexpressions. | |
5e69f11e | 3675 | |
fa9a63c5 RM |
3676 | Do not consider matching one past the index STOP in the virtual |
3677 | concatenation of STRING1 and STRING2. | |
3678 | ||
3679 | We return either the position in the strings at which the match was | |
3680 | found, -1 if no match, or -2 if error (such as failure | |
3681 | stack overflow). */ | |
3682 | ||
3683 | int | |
66f0296e | 3684 | re_search_2 (bufp, str1, size1, str2, size2, startpos, range, regs, stop) |
fa9a63c5 | 3685 | struct re_pattern_buffer *bufp; |
66f0296e | 3686 | const char *str1, *str2; |
fa9a63c5 RM |
3687 | int size1, size2; |
3688 | int startpos; | |
3689 | int range; | |
3690 | struct re_registers *regs; | |
3691 | int stop; | |
3692 | { | |
3693 | int val; | |
66f0296e SM |
3694 | re_char *string1 = (re_char*) str1; |
3695 | re_char *string2 = (re_char*) str2; | |
fa9a63c5 | 3696 | register char *fastmap = bufp->fastmap; |
6676cb1c | 3697 | register RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 RM |
3698 | int total_size = size1 + size2; |
3699 | int endpos = startpos + range; | |
c8499ba5 | 3700 | int anchored_start = 0; |
fa9a63c5 | 3701 | |
25fe55af | 3702 | /* Nonzero if we have to concern multibyte character. */ |
0683b6fa | 3703 | const boolean multibyte = bufp->multibyte; |
b18215fc | 3704 | |
fa9a63c5 RM |
3705 | /* Check for out-of-range STARTPOS. */ |
3706 | if (startpos < 0 || startpos > total_size) | |
3707 | return -1; | |
5e69f11e | 3708 | |
fa9a63c5 | 3709 | /* Fix up RANGE if it might eventually take us outside |
34597fa9 | 3710 | the virtual concatenation of STRING1 and STRING2. |
5e69f11e | 3711 | Make sure we won't move STARTPOS below 0 or above TOTAL_SIZE. */ |
34597fa9 RS |
3712 | if (endpos < 0) |
3713 | range = 0 - startpos; | |
fa9a63c5 RM |
3714 | else if (endpos > total_size) |
3715 | range = total_size - startpos; | |
3716 | ||
3717 | /* If the search isn't to be a backwards one, don't waste time in a | |
7b140fd7 | 3718 | search for a pattern anchored at beginning of buffer. */ |
fa9a63c5 RM |
3719 | if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == begbuf && range > 0) |
3720 | { | |
3721 | if (startpos > 0) | |
3722 | return -1; | |
3723 | else | |
7b140fd7 | 3724 | range = 0; |
fa9a63c5 RM |
3725 | } |
3726 | ||
ae4788a8 RS |
3727 | #ifdef emacs |
3728 | /* In a forward search for something that starts with \=. | |
3729 | don't keep searching past point. */ | |
3730 | if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == at_dot && range > 0) | |
3731 | { | |
7b140fd7 RS |
3732 | range = PT_BYTE - BEGV_BYTE - startpos; |
3733 | if (range < 0) | |
ae4788a8 RS |
3734 | return -1; |
3735 | } | |
3736 | #endif /* emacs */ | |
3737 | ||
fa9a63c5 RM |
3738 | /* Update the fastmap now if not correct already. */ |
3739 | if (fastmap && !bufp->fastmap_accurate) | |
3740 | if (re_compile_fastmap (bufp) == -2) | |
3741 | return -2; | |
5e69f11e | 3742 | |
c8499ba5 RS |
3743 | /* See whether the pattern is anchored. */ |
3744 | if (bufp->buffer[0] == begline) | |
3745 | anchored_start = 1; | |
3746 | ||
b18215fc | 3747 | #ifdef emacs |
cc9b4df2 KH |
3748 | gl_state.object = re_match_object; |
3749 | { | |
99633e97 | 3750 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (POS_AS_IN_BUFFER (startpos)); |
cc9b4df2 KH |
3751 | |
3752 | SETUP_SYNTAX_TABLE_FOR_OBJECT (re_match_object, charpos, 1); | |
3753 | } | |
b18215fc RS |
3754 | #endif |
3755 | ||
fa9a63c5 RM |
3756 | /* Loop through the string, looking for a place to start matching. */ |
3757 | for (;;) | |
5e69f11e | 3758 | { |
c8499ba5 RS |
3759 | /* If the pattern is anchored, |
3760 | skip quickly past places we cannot match. | |
3761 | We don't bother to treat startpos == 0 specially | |
3762 | because that case doesn't repeat. */ | |
3763 | if (anchored_start && startpos > 0) | |
3764 | { | |
3765 | if (! (bufp->newline_anchor | |
3766 | && ((startpos <= size1 ? string1[startpos - 1] | |
3767 | : string2[startpos - size1 - 1]) | |
3768 | == '\n'))) | |
3769 | goto advance; | |
3770 | } | |
3771 | ||
fa9a63c5 | 3772 | /* If a fastmap is supplied, skip quickly over characters that |
25fe55af RS |
3773 | cannot be the start of a match. If the pattern can match the |
3774 | null string, however, we don't need to skip characters; we want | |
3775 | the first null string. */ | |
fa9a63c5 RM |
3776 | if (fastmap && startpos < total_size && !bufp->can_be_null) |
3777 | { | |
66f0296e | 3778 | register re_char *d; |
e934739e RS |
3779 | register unsigned int buf_ch; |
3780 | ||
3781 | d = POS_ADDR_VSTRING (startpos); | |
3782 | ||
25fe55af | 3783 | if (range > 0) /* Searching forwards. */ |
fa9a63c5 | 3784 | { |
fa9a63c5 RM |
3785 | register int lim = 0; |
3786 | int irange = range; | |
3787 | ||
25fe55af RS |
3788 | if (startpos < size1 && startpos + range >= size1) |
3789 | lim = range - (size1 - startpos); | |
fa9a63c5 | 3790 | |
25fe55af RS |
3791 | /* Written out as an if-else to avoid testing `translate' |
3792 | inside the loop. */ | |
28ae27ae AS |
3793 | if (RE_TRANSLATE_P (translate)) |
3794 | { | |
e934739e RS |
3795 | if (multibyte) |
3796 | while (range > lim) | |
3797 | { | |
3798 | int buf_charlen; | |
3799 | ||
3800 | buf_ch = STRING_CHAR_AND_LENGTH (d, range - lim, | |
3801 | buf_charlen); | |
3802 | ||
3803 | buf_ch = RE_TRANSLATE (translate, buf_ch); | |
3804 | if (buf_ch >= 0400 | |
3805 | || fastmap[buf_ch]) | |
3806 | break; | |
3807 | ||
3808 | range -= buf_charlen; | |
3809 | d += buf_charlen; | |
3810 | } | |
3811 | else | |
3812 | while (range > lim | |
66f0296e | 3813 | && !fastmap[RE_TRANSLATE (translate, *d)]) |
33c46939 RS |
3814 | { |
3815 | d++; | |
3816 | range--; | |
3817 | } | |
e934739e | 3818 | } |
fa9a63c5 | 3819 | else |
66f0296e | 3820 | while (range > lim && !fastmap[*d]) |
33c46939 RS |
3821 | { |
3822 | d++; | |
3823 | range--; | |
3824 | } | |
fa9a63c5 RM |
3825 | |
3826 | startpos += irange - range; | |
3827 | } | |
25fe55af | 3828 | else /* Searching backwards. */ |
fa9a63c5 | 3829 | { |
4e8a9132 SM |
3830 | buf_ch = STRING_CHAR (d, (startpos >= size1 |
3831 | ? size2 + size1 - startpos | |
3832 | : size1 - startpos)); | |
28703c16 | 3833 | if (RE_TRANSLATE_P (translate)) |
e934739e | 3834 | buf_ch = RE_TRANSLATE (translate, buf_ch); |
fa9a63c5 | 3835 | |
e934739e RS |
3836 | if (! (buf_ch >= 0400 |
3837 | || fastmap[buf_ch])) | |
fa9a63c5 RM |
3838 | goto advance; |
3839 | } | |
3840 | } | |
3841 | ||
3842 | /* If can't match the null string, and that's all we have left, fail. */ | |
3843 | if (range >= 0 && startpos == total_size && fastmap | |
25fe55af | 3844 | && !bufp->can_be_null) |
fa9a63c5 RM |
3845 | return -1; |
3846 | ||
3847 | val = re_match_2_internal (bufp, string1, size1, string2, size2, | |
3848 | startpos, regs, stop); | |
3849 | #ifndef REGEX_MALLOC | |
3850 | #ifdef C_ALLOCA | |
3851 | alloca (0); | |
3852 | #endif | |
3853 | #endif | |
3854 | ||
3855 | if (val >= 0) | |
3856 | return startpos; | |
5e69f11e | 3857 | |
fa9a63c5 RM |
3858 | if (val == -2) |
3859 | return -2; | |
3860 | ||
3861 | advance: | |
5e69f11e | 3862 | if (!range) |
25fe55af | 3863 | break; |
5e69f11e | 3864 | else if (range > 0) |
25fe55af | 3865 | { |
b18215fc RS |
3866 | /* Update STARTPOS to the next character boundary. */ |
3867 | if (multibyte) | |
3868 | { | |
66f0296e SM |
3869 | re_char *p = POS_ADDR_VSTRING (startpos); |
3870 | re_char *pend = STOP_ADDR_VSTRING (startpos); | |
b18215fc RS |
3871 | int len = MULTIBYTE_FORM_LENGTH (p, pend - p); |
3872 | ||
3873 | range -= len; | |
3874 | if (range < 0) | |
3875 | break; | |
3876 | startpos += len; | |
3877 | } | |
3878 | else | |
3879 | { | |
b560c397 RS |
3880 | range--; |
3881 | startpos++; | |
3882 | } | |
e318085a | 3883 | } |
fa9a63c5 | 3884 | else |
25fe55af RS |
3885 | { |
3886 | range++; | |
3887 | startpos--; | |
b18215fc RS |
3888 | |
3889 | /* Update STARTPOS to the previous character boundary. */ | |
3890 | if (multibyte) | |
3891 | { | |
66f0296e | 3892 | re_char *p = POS_ADDR_VSTRING (startpos); |
b18215fc RS |
3893 | int len = 0; |
3894 | ||
3895 | /* Find the head of multibyte form. */ | |
5d967c7a | 3896 | while (!CHAR_HEAD_P (*p)) |
b18215fc RS |
3897 | p--, len++; |
3898 | ||
3899 | /* Adjust it. */ | |
3900 | #if 0 /* XXX */ | |
3901 | if (MULTIBYTE_FORM_LENGTH (p, len + 1) != (len + 1)) | |
3902 | ; | |
3903 | else | |
3904 | #endif | |
3905 | { | |
3906 | range += len; | |
3907 | if (range > 0) | |
3908 | break; | |
3909 | ||
3910 | startpos -= len; | |
3911 | } | |
3912 | } | |
25fe55af | 3913 | } |
fa9a63c5 RM |
3914 | } |
3915 | return -1; | |
3916 | } /* re_search_2 */ | |
3917 | \f | |
3918 | /* Declarations and macros for re_match_2. */ | |
3919 | ||
3920 | static int bcmp_translate (); | |
fa9a63c5 RM |
3921 | |
3922 | /* This converts PTR, a pointer into one of the search strings `string1' | |
3923 | and `string2' into an offset from the beginning of that string. */ | |
3924 | #define POINTER_TO_OFFSET(ptr) \ | |
3925 | (FIRST_STRING_P (ptr) \ | |
3926 | ? ((regoff_t) ((ptr) - string1)) \ | |
3927 | : ((regoff_t) ((ptr) - string2 + size1))) | |
3928 | ||
fa9a63c5 RM |
3929 | /* Call before fetching a character with *d. This switches over to |
3930 | string2 if necessary. */ | |
3931 | #define PREFETCH() \ | |
25fe55af | 3932 | while (d == dend) \ |
fa9a63c5 RM |
3933 | { \ |
3934 | /* End of string2 => fail. */ \ | |
25fe55af RS |
3935 | if (dend == end_match_2) \ |
3936 | goto fail; \ | |
3937 | /* End of string1 => advance to string2. */ \ | |
3938 | d = string2; \ | |
fa9a63c5 RM |
3939 | dend = end_match_2; \ |
3940 | } | |
3941 | ||
3942 | ||
3943 | /* Test if at very beginning or at very end of the virtual concatenation | |
25fe55af | 3944 | of `string1' and `string2'. If only one string, it's `string2'. */ |
fa9a63c5 | 3945 | #define AT_STRINGS_BEG(d) ((d) == (size1 ? string1 : string2) || !size2) |
5e69f11e | 3946 | #define AT_STRINGS_END(d) ((d) == end2) |
fa9a63c5 RM |
3947 | |
3948 | ||
3949 | /* Test if D points to a character which is word-constituent. We have | |
3950 | two special cases to check for: if past the end of string1, look at | |
3951 | the first character in string2; and if before the beginning of | |
3952 | string2, look at the last character in string1. */ | |
3953 | #define WORDCHAR_P(d) \ | |
3954 | (SYNTAX ((d) == end1 ? *string2 \ | |
25fe55af | 3955 | : (d) == string2 - 1 ? *(end1 - 1) : *(d)) \ |
fa9a63c5 RM |
3956 | == Sword) |
3957 | ||
9121ca40 | 3958 | /* Disabled due to a compiler bug -- see comment at case wordbound */ |
b18215fc RS |
3959 | |
3960 | /* The comment at case wordbound is following one, but we don't use | |
3961 | AT_WORD_BOUNDARY anymore to support multibyte form. | |
3962 | ||
3963 | The DEC Alpha C compiler 3.x generates incorrect code for the | |
25fe55af RS |
3964 | test WORDCHAR_P (d - 1) != WORDCHAR_P (d) in the expansion of |
3965 | AT_WORD_BOUNDARY, so this code is disabled. Expanding the | |
b18215fc RS |
3966 | macro and introducing temporary variables works around the bug. */ |
3967 | ||
9121ca40 | 3968 | #if 0 |
fa9a63c5 RM |
3969 | /* Test if the character before D and the one at D differ with respect |
3970 | to being word-constituent. */ | |
3971 | #define AT_WORD_BOUNDARY(d) \ | |
3972 | (AT_STRINGS_BEG (d) || AT_STRINGS_END (d) \ | |
3973 | || WORDCHAR_P (d - 1) != WORDCHAR_P (d)) | |
9121ca40 | 3974 | #endif |
fa9a63c5 RM |
3975 | |
3976 | /* Free everything we malloc. */ | |
3977 | #ifdef MATCH_MAY_ALLOCATE | |
00049484 | 3978 | #define FREE_VAR(var) if (var) { REGEX_FREE (var); var = NULL; } else |
fa9a63c5 RM |
3979 | #define FREE_VARIABLES() \ |
3980 | do { \ | |
3981 | REGEX_FREE_STACK (fail_stack.stack); \ | |
3982 | FREE_VAR (regstart); \ | |
3983 | FREE_VAR (regend); \ | |
fa9a63c5 RM |
3984 | FREE_VAR (best_regstart); \ |
3985 | FREE_VAR (best_regend); \ | |
fa9a63c5 RM |
3986 | } while (0) |
3987 | #else | |
3988 | #define FREE_VARIABLES() ((void)0) /* Do nothing! But inhibit gcc warning. */ | |
3989 | #endif /* not MATCH_MAY_ALLOCATE */ | |
3990 | ||
505bde11 SM |
3991 | \f |
3992 | /* Optimization routines. */ | |
3993 | ||
4e8a9132 SM |
3994 | /* If the operation is a match against one or more chars, |
3995 | return a pointer to the next operation, else return NULL. */ | |
3996 | static unsigned char * | |
3997 | skip_one_char (p) | |
3998 | unsigned char *p; | |
3999 | { | |
4000 | switch (SWITCH_ENUM_CAST (*p++)) | |
4001 | { | |
4002 | case anychar: | |
4003 | break; | |
4004 | ||
4005 | case exactn: | |
4006 | p += *p + 1; | |
4007 | break; | |
4008 | ||
4009 | case charset_not: | |
4010 | case charset: | |
4011 | if (CHARSET_RANGE_TABLE_EXISTS_P (p - 1)) | |
4012 | { | |
4013 | int mcnt; | |
4014 | p = CHARSET_RANGE_TABLE (p - 1); | |
4015 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
4016 | p = CHARSET_RANGE_TABLE_END (p, mcnt); | |
4017 | } | |
4018 | else | |
4019 | p += 1 + CHARSET_BITMAP_SIZE (p - 1); | |
4020 | break; | |
4021 | ||
4e8a9132 SM |
4022 | case syntaxspec: |
4023 | case notsyntaxspec: | |
1fb352e0 | 4024 | #ifdef emacs |
4e8a9132 SM |
4025 | case categoryspec: |
4026 | case notcategoryspec: | |
4027 | #endif /* emacs */ | |
4028 | p++; | |
4029 | break; | |
4030 | ||
4031 | default: | |
4032 | p = NULL; | |
4033 | } | |
4034 | return p; | |
4035 | } | |
4036 | ||
4037 | ||
505bde11 SM |
4038 | /* Jump over non-matching operations. */ |
4039 | static unsigned char * | |
4e8a9132 | 4040 | skip_noops (p, pend) |
505bde11 | 4041 | unsigned char *p, *pend; |
505bde11 SM |
4042 | { |
4043 | int mcnt; | |
4044 | while (p < pend) | |
4045 | { | |
4046 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p)) | |
4047 | { | |
4048 | case start_memory: | |
505bde11 SM |
4049 | case stop_memory: |
4050 | p += 2; break; | |
4051 | case no_op: | |
4052 | p += 1; break; | |
4053 | case jump: | |
4054 | p += 1; | |
4055 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
4056 | p += mcnt; | |
4057 | break; | |
4058 | default: | |
4059 | return p; | |
4060 | } | |
4061 | } | |
4062 | assert (p == pend); | |
4063 | return p; | |
4064 | } | |
4065 | ||
4066 | /* Non-zero if "p1 matches something" implies "p2 fails". */ | |
4067 | static int | |
4068 | mutually_exclusive_p (bufp, p1, p2) | |
4069 | struct re_pattern_buffer *bufp; | |
4070 | unsigned char *p1, *p2; | |
4071 | { | |
4e8a9132 SM |
4072 | re_opcode_t op2; |
4073 | const boolean multibyte = bufp->multibyte; | |
505bde11 SM |
4074 | unsigned char *pend = bufp->buffer + bufp->used; |
4075 | ||
4e8a9132 | 4076 | assert (p1 >= bufp->buffer && p1 < pend |
505bde11 SM |
4077 | && p2 >= bufp->buffer && p2 <= pend); |
4078 | ||
4079 | /* Skip over open/close-group commands. | |
4080 | If what follows this loop is a ...+ construct, | |
4081 | look at what begins its body, since we will have to | |
4082 | match at least one of that. */ | |
4e8a9132 SM |
4083 | p2 = skip_noops (p2, pend); |
4084 | /* The same skip can be done for p1, except that this function | |
4085 | is only used in the case where p1 is a simple match operator. */ | |
4086 | /* p1 = skip_noops (p1, pend); */ | |
4087 | ||
4088 | assert (p1 >= bufp->buffer && p1 < pend | |
4089 | && p2 >= bufp->buffer && p2 <= pend); | |
4090 | ||
4091 | op2 = p2 == pend ? succeed : *p2; | |
4092 | ||
4093 | switch (SWITCH_ENUM_CAST (op2)) | |
505bde11 | 4094 | { |
4e8a9132 SM |
4095 | case succeed: |
4096 | case endbuf: | |
4097 | /* If we're at the end of the pattern, we can change. */ | |
4098 | if (skip_one_char (p1)) | |
505bde11 | 4099 | { |
505bde11 SM |
4100 | DEBUG_PRINT1 (" End of pattern: fast loop.\n"); |
4101 | return 1; | |
505bde11 | 4102 | } |
4e8a9132 SM |
4103 | break; |
4104 | ||
4105 | case endline: | |
4106 | if (!bufp->newline_anchor) | |
4107 | break; | |
4108 | /* Fallthrough */ | |
4109 | case exactn: | |
4110 | { | |
4111 | register unsigned int c | |
4112 | = (re_opcode_t) *p2 == endline ? '\n' | |
4113 | : RE_STRING_CHAR(p2 + 2, pend - p2 - 2); | |
505bde11 | 4114 | |
4e8a9132 SM |
4115 | if ((re_opcode_t) *p1 == exactn) |
4116 | { | |
4117 | if (c != RE_STRING_CHAR (p1 + 2, pend - p1 - 2)) | |
4118 | { | |
4119 | DEBUG_PRINT3 (" '%c' != '%c' => fast loop.\n", c, p1[2]); | |
4120 | return 1; | |
4121 | } | |
4122 | } | |
505bde11 | 4123 | |
4e8a9132 SM |
4124 | else if ((re_opcode_t) *p1 == charset |
4125 | || (re_opcode_t) *p1 == charset_not) | |
4126 | { | |
4127 | int not = (re_opcode_t) *p1 == charset_not; | |
505bde11 | 4128 | |
4e8a9132 SM |
4129 | /* Test if C is listed in charset (or charset_not) |
4130 | at `p1'. */ | |
4131 | if (SINGLE_BYTE_CHAR_P (c)) | |
4132 | { | |
4133 | if (c < CHARSET_BITMAP_SIZE (p1) * BYTEWIDTH | |
4134 | && p1[2 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH))) | |
4135 | not = !not; | |
4136 | } | |
4137 | else if (CHARSET_RANGE_TABLE_EXISTS_P (p1)) | |
4138 | CHARSET_LOOKUP_RANGE_TABLE (not, c, p1); | |
505bde11 | 4139 | |
4e8a9132 SM |
4140 | /* `not' is equal to 1 if c would match, which means |
4141 | that we can't change to pop_failure_jump. */ | |
4142 | if (!not) | |
4143 | { | |
4144 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4145 | return 1; | |
4146 | } | |
4147 | } | |
4148 | else if ((re_opcode_t) *p1 == anychar | |
4149 | && c == '\n') | |
4150 | { | |
4151 | DEBUG_PRINT1 (" . != \\n => fast loop.\n"); | |
4152 | return 1; | |
4153 | } | |
4154 | } | |
4155 | break; | |
505bde11 | 4156 | |
4e8a9132 SM |
4157 | case charset: |
4158 | case charset_not: | |
4159 | { | |
4160 | if ((re_opcode_t) *p1 == exactn) | |
4161 | /* Reuse the code above. */ | |
4162 | return mutually_exclusive_p (bufp, p2, p1); | |
505bde11 SM |
4163 | |
4164 | ||
4165 | /* It is hard to list up all the character in charset | |
4166 | P2 if it includes multibyte character. Give up in | |
4167 | such case. */ | |
4168 | else if (!multibyte || !CHARSET_RANGE_TABLE_EXISTS_P (p2)) | |
4169 | { | |
4170 | /* Now, we are sure that P2 has no range table. | |
4171 | So, for the size of bitmap in P2, `p2[1]' is | |
4172 | enough. But P1 may have range table, so the | |
4173 | size of bitmap table of P1 is extracted by | |
4174 | using macro `CHARSET_BITMAP_SIZE'. | |
4175 | ||
4176 | Since we know that all the character listed in | |
4177 | P2 is ASCII, it is enough to test only bitmap | |
4178 | table of P1. */ | |
4179 | ||
4180 | if (*p1 == *p2) | |
4181 | { | |
4182 | int idx; | |
4183 | /* We win if the charset inside the loop | |
4184 | has no overlap with the one after the loop. */ | |
4185 | for (idx = 0; | |
4186 | (idx < (int) p2[1] | |
4187 | && idx < CHARSET_BITMAP_SIZE (p1)); | |
4188 | idx++) | |
4189 | if ((p2[2 + idx] & p1[2 + idx]) != 0) | |
4190 | break; | |
4191 | ||
4192 | if (idx == p2[1] | |
4193 | || idx == CHARSET_BITMAP_SIZE (p1)) | |
4194 | { | |
4195 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4196 | return 1; | |
4197 | } | |
4198 | } | |
4199 | else if ((re_opcode_t) *p1 == charset | |
4200 | || (re_opcode_t) *p1 == charset_not) | |
4201 | { | |
4202 | int idx; | |
4203 | /* We win if the charset_not inside the loop lists | |
4204 | every character listed in the charset after. */ | |
4205 | for (idx = 0; idx < (int) p2[1]; idx++) | |
4206 | if (! (p2[2 + idx] == 0 | |
4207 | || (idx < CHARSET_BITMAP_SIZE (p1) | |
4208 | && ((p2[2 + idx] & ~ p1[2 + idx]) == 0)))) | |
4209 | break; | |
4210 | ||
4e8a9132 SM |
4211 | if (idx == p2[1]) |
4212 | { | |
4213 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4214 | return 1; | |
4215 | } | |
4216 | } | |
4217 | } | |
4218 | } | |
4219 | ||
4e8a9132 SM |
4220 | case wordend: |
4221 | case notsyntaxspec: | |
4222 | return ((re_opcode_t) *p1 == syntaxspec | |
4223 | && p1[1] == (op2 == wordend ? Sword : p2[1])); | |
4224 | ||
4225 | case wordbeg: | |
4226 | case syntaxspec: | |
4227 | return ((re_opcode_t) *p1 == notsyntaxspec | |
4228 | && p1[1] == (op2 == wordend ? Sword : p2[1])); | |
4229 | ||
4230 | case wordbound: | |
4231 | return (((re_opcode_t) *p1 == notsyntaxspec | |
4232 | || (re_opcode_t) *p1 == syntaxspec) | |
4233 | && p1[1] == Sword); | |
4234 | ||
1fb352e0 | 4235 | #ifdef emacs |
4e8a9132 SM |
4236 | case categoryspec: |
4237 | return ((re_opcode_t) *p1 == notcategoryspec && p1[1] == p2[1]); | |
4238 | case notcategoryspec: | |
4239 | return ((re_opcode_t) *p1 == categoryspec && p1[1] == p2[1]); | |
4240 | #endif /* emacs */ | |
4241 | ||
4242 | default: | |
4243 | ; | |
505bde11 SM |
4244 | } |
4245 | ||
4246 | /* Safe default. */ | |
4247 | return 0; | |
4248 | } | |
4249 | ||
fa9a63c5 RM |
4250 | \f |
4251 | /* Matching routines. */ | |
4252 | ||
25fe55af | 4253 | #ifndef emacs /* Emacs never uses this. */ |
fa9a63c5 RM |
4254 | /* re_match is like re_match_2 except it takes only a single string. */ |
4255 | ||
4256 | int | |
4257 | re_match (bufp, string, size, pos, regs) | |
4258 | struct re_pattern_buffer *bufp; | |
4259 | const char *string; | |
4260 | int size, pos; | |
4261 | struct re_registers *regs; | |
4262 | { | |
4263 | int result = re_match_2_internal (bufp, NULL, 0, string, size, | |
4264 | pos, regs, size); | |
4265 | alloca (0); | |
4266 | return result; | |
4267 | } | |
4268 | #endif /* not emacs */ | |
4269 | ||
b18215fc RS |
4270 | #ifdef emacs |
4271 | /* In Emacs, this is the string or buffer in which we | |
25fe55af | 4272 | are matching. It is used for looking up syntax properties. */ |
b18215fc RS |
4273 | Lisp_Object re_match_object; |
4274 | #endif | |
fa9a63c5 RM |
4275 | |
4276 | /* re_match_2 matches the compiled pattern in BUFP against the | |
4277 | the (virtual) concatenation of STRING1 and STRING2 (of length SIZE1 | |
4278 | and SIZE2, respectively). We start matching at POS, and stop | |
4279 | matching at STOP. | |
5e69f11e | 4280 | |
fa9a63c5 | 4281 | If REGS is non-null and the `no_sub' field of BUFP is nonzero, we |
25fe55af | 4282 | store offsets for the substring each group matched in REGS. See the |
fa9a63c5 RM |
4283 | documentation for exactly how many groups we fill. |
4284 | ||
4285 | We return -1 if no match, -2 if an internal error (such as the | |
25fe55af | 4286 | failure stack overflowing). Otherwise, we return the length of the |
fa9a63c5 RM |
4287 | matched substring. */ |
4288 | ||
4289 | int | |
4290 | re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop) | |
4291 | struct re_pattern_buffer *bufp; | |
4292 | const char *string1, *string2; | |
4293 | int size1, size2; | |
4294 | int pos; | |
4295 | struct re_registers *regs; | |
4296 | int stop; | |
4297 | { | |
b18215fc | 4298 | int result; |
25fe55af | 4299 | |
b18215fc | 4300 | #ifdef emacs |
cc9b4df2 KH |
4301 | int charpos; |
4302 | gl_state.object = re_match_object; | |
99633e97 | 4303 | charpos = SYNTAX_TABLE_BYTE_TO_CHAR (POS_AS_IN_BUFFER (pos)); |
cc9b4df2 | 4304 | SETUP_SYNTAX_TABLE_FOR_OBJECT (re_match_object, charpos, 1); |
b18215fc RS |
4305 | #endif |
4306 | ||
4307 | result = re_match_2_internal (bufp, string1, size1, string2, size2, | |
cc9b4df2 | 4308 | pos, regs, stop); |
fa9a63c5 RM |
4309 | alloca (0); |
4310 | return result; | |
4311 | } | |
4312 | ||
4313 | /* This is a separate function so that we can force an alloca cleanup | |
25fe55af | 4314 | afterwards. */ |
fa9a63c5 RM |
4315 | static int |
4316 | re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop) | |
4317 | struct re_pattern_buffer *bufp; | |
66f0296e | 4318 | re_char *string1, *string2; |
fa9a63c5 RM |
4319 | int size1, size2; |
4320 | int pos; | |
4321 | struct re_registers *regs; | |
4322 | int stop; | |
4323 | { | |
4324 | /* General temporaries. */ | |
4325 | int mcnt; | |
66f0296e | 4326 | boolean not; |
fa9a63c5 RM |
4327 | unsigned char *p1; |
4328 | ||
4329 | /* Just past the end of the corresponding string. */ | |
66f0296e | 4330 | re_char *end1, *end2; |
fa9a63c5 RM |
4331 | |
4332 | /* Pointers into string1 and string2, just past the last characters in | |
25fe55af | 4333 | each to consider matching. */ |
66f0296e | 4334 | re_char *end_match_1, *end_match_2; |
fa9a63c5 RM |
4335 | |
4336 | /* Where we are in the data, and the end of the current string. */ | |
66f0296e | 4337 | re_char *d, *dend; |
5e69f11e | 4338 | |
99633e97 SM |
4339 | /* Used sometimes to remember where we were before starting matching |
4340 | an operator so that we can go back in case of failure. This "atomic" | |
4341 | behavior of matching opcodes is indispensable to the correctness | |
4342 | of the on_failure_keep_string_jump optimization. */ | |
4343 | re_char *dfail; | |
4344 | ||
fa9a63c5 RM |
4345 | /* Where we are in the pattern, and the end of the pattern. */ |
4346 | unsigned char *p = bufp->buffer; | |
4347 | register unsigned char *pend = p + bufp->used; | |
4348 | ||
25fe55af | 4349 | /* We use this to map every character in the string. */ |
6676cb1c | 4350 | RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 | 4351 | |
25fe55af | 4352 | /* Nonzero if we have to concern multibyte character. */ |
1fb352e0 | 4353 | const boolean multibyte = bufp->multibyte; |
b18215fc | 4354 | |
fa9a63c5 RM |
4355 | /* Failure point stack. Each place that can handle a failure further |
4356 | down the line pushes a failure point on this stack. It consists of | |
505bde11 | 4357 | regstart, and regend for all registers corresponding to |
fa9a63c5 RM |
4358 | the subexpressions we're currently inside, plus the number of such |
4359 | registers, and, finally, two char *'s. The first char * is where | |
4360 | to resume scanning the pattern; the second one is where to resume | |
505bde11 | 4361 | scanning the strings. */ |
25fe55af | 4362 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global. */ |
fa9a63c5 RM |
4363 | fail_stack_type fail_stack; |
4364 | #endif | |
4365 | #ifdef DEBUG | |
4366 | static unsigned failure_id = 0; | |
4367 | unsigned nfailure_points_pushed = 0, nfailure_points_popped = 0; | |
4368 | #endif | |
4369 | ||
99633e97 | 4370 | #if defined (REL_ALLOC) && defined (REGEX_MALLOC) |
fa9a63c5 RM |
4371 | /* This holds the pointer to the failure stack, when |
4372 | it is allocated relocatably. */ | |
4373 | fail_stack_elt_t *failure_stack_ptr; | |
99633e97 | 4374 | #endif |
fa9a63c5 RM |
4375 | |
4376 | /* We fill all the registers internally, independent of what we | |
25fe55af | 4377 | return, for use in backreferences. The number here includes |
fa9a63c5 RM |
4378 | an element for register zero. */ |
4379 | unsigned num_regs = bufp->re_nsub + 1; | |
5e69f11e | 4380 | |
fa9a63c5 RM |
4381 | /* Information on the contents of registers. These are pointers into |
4382 | the input strings; they record just what was matched (on this | |
4383 | attempt) by a subexpression part of the pattern, that is, the | |
4384 | regnum-th regstart pointer points to where in the pattern we began | |
4385 | matching and the regnum-th regend points to right after where we | |
4386 | stopped matching the regnum-th subexpression. (The zeroth register | |
4387 | keeps track of what the whole pattern matches.) */ | |
4388 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
66f0296e | 4389 | re_char **regstart, **regend; |
fa9a63c5 RM |
4390 | #endif |
4391 | ||
fa9a63c5 | 4392 | /* The following record the register info as found in the above |
5e69f11e | 4393 | variables when we find a match better than any we've seen before. |
fa9a63c5 RM |
4394 | This happens as we backtrack through the failure points, which in |
4395 | turn happens only if we have not yet matched the entire string. */ | |
4396 | unsigned best_regs_set = false; | |
4397 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
66f0296e | 4398 | re_char **best_regstart, **best_regend; |
fa9a63c5 | 4399 | #endif |
5e69f11e | 4400 | |
fa9a63c5 RM |
4401 | /* Logically, this is `best_regend[0]'. But we don't want to have to |
4402 | allocate space for that if we're not allocating space for anything | |
25fe55af | 4403 | else (see below). Also, we never need info about register 0 for |
fa9a63c5 RM |
4404 | any of the other register vectors, and it seems rather a kludge to |
4405 | treat `best_regend' differently than the rest. So we keep track of | |
4406 | the end of the best match so far in a separate variable. We | |
4407 | initialize this to NULL so that when we backtrack the first time | |
4408 | and need to test it, it's not garbage. */ | |
66f0296e | 4409 | re_char *match_end = NULL; |
fa9a63c5 | 4410 | |
fa9a63c5 RM |
4411 | #ifdef DEBUG |
4412 | /* Counts the total number of registers pushed. */ | |
5e69f11e | 4413 | unsigned num_regs_pushed = 0; |
fa9a63c5 RM |
4414 | #endif |
4415 | ||
4416 | DEBUG_PRINT1 ("\n\nEntering re_match_2.\n"); | |
5e69f11e | 4417 | |
fa9a63c5 | 4418 | INIT_FAIL_STACK (); |
5e69f11e | 4419 | |
fa9a63c5 RM |
4420 | #ifdef MATCH_MAY_ALLOCATE |
4421 | /* Do not bother to initialize all the register variables if there are | |
4422 | no groups in the pattern, as it takes a fair amount of time. If | |
4423 | there are groups, we include space for register 0 (the whole | |
4424 | pattern), even though we never use it, since it simplifies the | |
4425 | array indexing. We should fix this. */ | |
4426 | if (bufp->re_nsub) | |
4427 | { | |
66f0296e SM |
4428 | regstart = REGEX_TALLOC (num_regs, re_char *); |
4429 | regend = REGEX_TALLOC (num_regs, re_char *); | |
4430 | best_regstart = REGEX_TALLOC (num_regs, re_char *); | |
4431 | best_regend = REGEX_TALLOC (num_regs, re_char *); | |
fa9a63c5 | 4432 | |
505bde11 | 4433 | if (!(regstart && regend && best_regstart && best_regend)) |
25fe55af RS |
4434 | { |
4435 | FREE_VARIABLES (); | |
4436 | return -2; | |
4437 | } | |
fa9a63c5 RM |
4438 | } |
4439 | else | |
4440 | { | |
4441 | /* We must initialize all our variables to NULL, so that | |
25fe55af | 4442 | `FREE_VARIABLES' doesn't try to free them. */ |
505bde11 | 4443 | regstart = regend = best_regstart = best_regend = NULL; |
fa9a63c5 RM |
4444 | } |
4445 | #endif /* MATCH_MAY_ALLOCATE */ | |
4446 | ||
4447 | /* The starting position is bogus. */ | |
4448 | if (pos < 0 || pos > size1 + size2) | |
4449 | { | |
4450 | FREE_VARIABLES (); | |
4451 | return -1; | |
4452 | } | |
5e69f11e | 4453 | |
fa9a63c5 RM |
4454 | /* Initialize subexpression text positions to -1 to mark ones that no |
4455 | start_memory/stop_memory has been seen for. Also initialize the | |
4456 | register information struct. */ | |
4457 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
99633e97 SM |
4458 | regstart[mcnt] = regend[mcnt] = REG_UNSET_VALUE; |
4459 | ||
4460 | /* Shorten strings to `stop'. */ | |
4461 | if (stop <= size1) | |
fa9a63c5 | 4462 | { |
99633e97 SM |
4463 | size1 = stop; |
4464 | size2 = 0; | |
fa9a63c5 | 4465 | } |
99633e97 SM |
4466 | else if (stop <= size1 + size2) |
4467 | size2 = stop - size1; | |
5e69f11e | 4468 | |
fa9a63c5 | 4469 | /* We move `string1' into `string2' if the latter's empty -- but not if |
25fe55af | 4470 | `string1' is null. */ |
fa9a63c5 RM |
4471 | if (size2 == 0 && string1 != NULL) |
4472 | { | |
4473 | string2 = string1; | |
4474 | size2 = size1; | |
4475 | string1 = 0; | |
4476 | size1 = 0; | |
4477 | } | |
4478 | end1 = string1 + size1; | |
4479 | end2 = string2 + size2; | |
4480 | ||
4481 | /* Compute where to stop matching, within the two strings. */ | |
99633e97 SM |
4482 | end_match_1 = end1; |
4483 | end_match_2 = end2; | |
fa9a63c5 | 4484 | |
5e69f11e | 4485 | /* `p' scans through the pattern as `d' scans through the data. |
fa9a63c5 RM |
4486 | `dend' is the end of the input string that `d' points within. `d' |
4487 | is advanced into the following input string whenever necessary, but | |
4488 | this happens before fetching; therefore, at the beginning of the | |
4489 | loop, `d' can be pointing at the end of a string, but it cannot | |
4490 | equal `string2'. */ | |
4491 | if (size1 > 0 && pos <= size1) | |
4492 | { | |
4493 | d = string1 + pos; | |
4494 | dend = end_match_1; | |
4495 | } | |
4496 | else | |
4497 | { | |
4498 | d = string2 + pos - size1; | |
4499 | dend = end_match_2; | |
4500 | } | |
4501 | ||
4502 | DEBUG_PRINT1 ("The compiled pattern is: "); | |
4503 | DEBUG_PRINT_COMPILED_PATTERN (bufp, p, pend); | |
4504 | DEBUG_PRINT1 ("The string to match is: `"); | |
4505 | DEBUG_PRINT_DOUBLE_STRING (d, string1, size1, string2, size2); | |
4506 | DEBUG_PRINT1 ("'\n"); | |
5e69f11e | 4507 | |
25fe55af | 4508 | /* This loops over pattern commands. It exits by returning from the |
fa9a63c5 RM |
4509 | function if the match is complete, or it drops through if the match |
4510 | fails at this starting point in the input data. */ | |
4511 | for (;;) | |
4512 | { | |
505bde11 | 4513 | DEBUG_PRINT2 ("\n%p: ", p); |
fa9a63c5 RM |
4514 | |
4515 | if (p == pend) | |
4516 | { /* End of pattern means we might have succeeded. */ | |
25fe55af | 4517 | DEBUG_PRINT1 ("end of pattern ... "); |
5e69f11e | 4518 | |
fa9a63c5 | 4519 | /* If we haven't matched the entire string, and we want the |
25fe55af RS |
4520 | longest match, try backtracking. */ |
4521 | if (d != end_match_2) | |
fa9a63c5 RM |
4522 | { |
4523 | /* 1 if this match ends in the same string (string1 or string2) | |
4524 | as the best previous match. */ | |
5e69f11e | 4525 | boolean same_str_p = (FIRST_STRING_P (match_end) |
99633e97 | 4526 | == FIRST_STRING_P (d)); |
fa9a63c5 RM |
4527 | /* 1 if this match is the best seen so far. */ |
4528 | boolean best_match_p; | |
4529 | ||
4530 | /* AIX compiler got confused when this was combined | |
25fe55af | 4531 | with the previous declaration. */ |
fa9a63c5 RM |
4532 | if (same_str_p) |
4533 | best_match_p = d > match_end; | |
4534 | else | |
99633e97 | 4535 | best_match_p = !FIRST_STRING_P (d); |
fa9a63c5 | 4536 | |
25fe55af RS |
4537 | DEBUG_PRINT1 ("backtracking.\n"); |
4538 | ||
4539 | if (!FAIL_STACK_EMPTY ()) | |
4540 | { /* More failure points to try. */ | |
4541 | ||
4542 | /* If exceeds best match so far, save it. */ | |
4543 | if (!best_regs_set || best_match_p) | |
4544 | { | |
4545 | best_regs_set = true; | |
4546 | match_end = d; | |
4547 | ||
4548 | DEBUG_PRINT1 ("\nSAVING match as best so far.\n"); | |
4549 | ||
4550 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
4551 | { | |
4552 | best_regstart[mcnt] = regstart[mcnt]; | |
4553 | best_regend[mcnt] = regend[mcnt]; | |
4554 | } | |
4555 | } | |
4556 | goto fail; | |
4557 | } | |
4558 | ||
4559 | /* If no failure points, don't restore garbage. And if | |
4560 | last match is real best match, don't restore second | |
4561 | best one. */ | |
4562 | else if (best_regs_set && !best_match_p) | |
4563 | { | |
4564 | restore_best_regs: | |
4565 | /* Restore best match. It may happen that `dend == | |
4566 | end_match_1' while the restored d is in string2. | |
4567 | For example, the pattern `x.*y.*z' against the | |
4568 | strings `x-' and `y-z-', if the two strings are | |
4569 | not consecutive in memory. */ | |
4570 | DEBUG_PRINT1 ("Restoring best registers.\n"); | |
4571 | ||
4572 | d = match_end; | |
4573 | dend = ((d >= string1 && d <= end1) | |
4574 | ? end_match_1 : end_match_2); | |
fa9a63c5 RM |
4575 | |
4576 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
4577 | { | |
4578 | regstart[mcnt] = best_regstart[mcnt]; | |
4579 | regend[mcnt] = best_regend[mcnt]; | |
4580 | } | |
25fe55af RS |
4581 | } |
4582 | } /* d != end_match_2 */ | |
fa9a63c5 RM |
4583 | |
4584 | succeed_label: | |
25fe55af | 4585 | DEBUG_PRINT1 ("Accepting match.\n"); |
fa9a63c5 | 4586 | |
25fe55af RS |
4587 | /* If caller wants register contents data back, do it. */ |
4588 | if (regs && !bufp->no_sub) | |
fa9a63c5 | 4589 | { |
25fe55af RS |
4590 | /* Have the register data arrays been allocated? */ |
4591 | if (bufp->regs_allocated == REGS_UNALLOCATED) | |
4592 | { /* No. So allocate them with malloc. We need one | |
4593 | extra element beyond `num_regs' for the `-1' marker | |
4594 | GNU code uses. */ | |
4595 | regs->num_regs = MAX (RE_NREGS, num_regs + 1); | |
4596 | regs->start = TALLOC (regs->num_regs, regoff_t); | |
4597 | regs->end = TALLOC (regs->num_regs, regoff_t); | |
4598 | if (regs->start == NULL || regs->end == NULL) | |
fa9a63c5 RM |
4599 | { |
4600 | FREE_VARIABLES (); | |
4601 | return -2; | |
4602 | } | |
25fe55af RS |
4603 | bufp->regs_allocated = REGS_REALLOCATE; |
4604 | } | |
4605 | else if (bufp->regs_allocated == REGS_REALLOCATE) | |
4606 | { /* Yes. If we need more elements than were already | |
4607 | allocated, reallocate them. If we need fewer, just | |
4608 | leave it alone. */ | |
4609 | if (regs->num_regs < num_regs + 1) | |
4610 | { | |
4611 | regs->num_regs = num_regs + 1; | |
4612 | RETALLOC (regs->start, regs->num_regs, regoff_t); | |
4613 | RETALLOC (regs->end, regs->num_regs, regoff_t); | |
4614 | if (regs->start == NULL || regs->end == NULL) | |
fa9a63c5 RM |
4615 | { |
4616 | FREE_VARIABLES (); | |
4617 | return -2; | |
4618 | } | |
25fe55af RS |
4619 | } |
4620 | } | |
4621 | else | |
fa9a63c5 RM |
4622 | { |
4623 | /* These braces fend off a "empty body in an else-statement" | |
25fe55af | 4624 | warning under GCC when assert expands to nothing. */ |
fa9a63c5 RM |
4625 | assert (bufp->regs_allocated == REGS_FIXED); |
4626 | } | |
4627 | ||
25fe55af RS |
4628 | /* Convert the pointer data in `regstart' and `regend' to |
4629 | indices. Register zero has to be set differently, | |
4630 | since we haven't kept track of any info for it. */ | |
4631 | if (regs->num_regs > 0) | |
4632 | { | |
4633 | regs->start[0] = pos; | |
99633e97 | 4634 | regs->end[0] = POINTER_TO_OFFSET (d); |
25fe55af | 4635 | } |
5e69f11e | 4636 | |
25fe55af RS |
4637 | /* Go through the first `min (num_regs, regs->num_regs)' |
4638 | registers, since that is all we initialized. */ | |
fa9a63c5 RM |
4639 | for (mcnt = 1; mcnt < MIN (num_regs, regs->num_regs); mcnt++) |
4640 | { | |
25fe55af RS |
4641 | if (REG_UNSET (regstart[mcnt]) || REG_UNSET (regend[mcnt])) |
4642 | regs->start[mcnt] = regs->end[mcnt] = -1; | |
4643 | else | |
4644 | { | |
fa9a63c5 RM |
4645 | regs->start[mcnt] |
4646 | = (regoff_t) POINTER_TO_OFFSET (regstart[mcnt]); | |
25fe55af | 4647 | regs->end[mcnt] |
fa9a63c5 | 4648 | = (regoff_t) POINTER_TO_OFFSET (regend[mcnt]); |
25fe55af | 4649 | } |
fa9a63c5 | 4650 | } |
5e69f11e | 4651 | |
25fe55af RS |
4652 | /* If the regs structure we return has more elements than |
4653 | were in the pattern, set the extra elements to -1. If | |
4654 | we (re)allocated the registers, this is the case, | |
4655 | because we always allocate enough to have at least one | |
4656 | -1 at the end. */ | |
4657 | for (mcnt = num_regs; mcnt < regs->num_regs; mcnt++) | |
4658 | regs->start[mcnt] = regs->end[mcnt] = -1; | |
fa9a63c5 RM |
4659 | } /* regs && !bufp->no_sub */ |
4660 | ||
25fe55af RS |
4661 | DEBUG_PRINT4 ("%u failure points pushed, %u popped (%u remain).\n", |
4662 | nfailure_points_pushed, nfailure_points_popped, | |
4663 | nfailure_points_pushed - nfailure_points_popped); | |
4664 | DEBUG_PRINT2 ("%u registers pushed.\n", num_regs_pushed); | |
fa9a63c5 | 4665 | |
99633e97 | 4666 | mcnt = POINTER_TO_OFFSET (d) - pos; |
fa9a63c5 | 4667 | |
25fe55af | 4668 | DEBUG_PRINT2 ("Returning %d from re_match_2.\n", mcnt); |
fa9a63c5 | 4669 | |
25fe55af RS |
4670 | FREE_VARIABLES (); |
4671 | return mcnt; | |
4672 | } | |
fa9a63c5 | 4673 | |
25fe55af | 4674 | /* Otherwise match next pattern command. */ |
fa9a63c5 RM |
4675 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++)) |
4676 | { | |
25fe55af RS |
4677 | /* Ignore these. Used to ignore the n of succeed_n's which |
4678 | currently have n == 0. */ | |
4679 | case no_op: | |
4680 | DEBUG_PRINT1 ("EXECUTING no_op.\n"); | |
4681 | break; | |
fa9a63c5 RM |
4682 | |
4683 | case succeed: | |
25fe55af | 4684 | DEBUG_PRINT1 ("EXECUTING succeed.\n"); |
fa9a63c5 RM |
4685 | goto succeed_label; |
4686 | ||
25fe55af RS |
4687 | /* Match the next n pattern characters exactly. The following |
4688 | byte in the pattern defines n, and the n bytes after that | |
4689 | are the characters to match. */ | |
fa9a63c5 RM |
4690 | case exactn: |
4691 | mcnt = *p++; | |
25fe55af | 4692 | DEBUG_PRINT2 ("EXECUTING exactn %d.\n", mcnt); |
fa9a63c5 | 4693 | |
99633e97 SM |
4694 | /* Remember the start point to rollback upon failure. */ |
4695 | dfail = d; | |
4696 | ||
25fe55af RS |
4697 | /* This is written out as an if-else so we don't waste time |
4698 | testing `translate' inside the loop. */ | |
28703c16 | 4699 | if (RE_TRANSLATE_P (translate)) |
fa9a63c5 | 4700 | { |
e934739e RS |
4701 | #ifdef emacs |
4702 | if (multibyte) | |
4703 | do | |
4704 | { | |
4705 | int pat_charlen, buf_charlen; | |
e71b1971 | 4706 | unsigned int pat_ch, buf_ch; |
e934739e RS |
4707 | |
4708 | PREFETCH (); | |
4709 | pat_ch = STRING_CHAR_AND_LENGTH (p, pend - p, pat_charlen); | |
4710 | buf_ch = STRING_CHAR_AND_LENGTH (d, dend - d, buf_charlen); | |
4711 | ||
4712 | if (RE_TRANSLATE (translate, buf_ch) | |
4713 | != pat_ch) | |
99633e97 SM |
4714 | { |
4715 | d = dfail; | |
4716 | goto fail; | |
4717 | } | |
e934739e RS |
4718 | |
4719 | p += pat_charlen; | |
4720 | d += buf_charlen; | |
4721 | mcnt -= pat_charlen; | |
4722 | } | |
4723 | while (mcnt > 0); | |
4724 | else | |
4725 | #endif /* not emacs */ | |
4726 | do | |
4727 | { | |
4728 | PREFETCH (); | |
66f0296e | 4729 | if (RE_TRANSLATE (translate, *d) != *p++) |
99633e97 SM |
4730 | { |
4731 | d = dfail; | |
4732 | goto fail; | |
4733 | } | |
33c46939 | 4734 | d++; |
e934739e RS |
4735 | } |
4736 | while (--mcnt); | |
fa9a63c5 RM |
4737 | } |
4738 | else | |
4739 | { | |
4740 | do | |
4741 | { | |
4742 | PREFETCH (); | |
99633e97 SM |
4743 | if (*d++ != *p++) |
4744 | { | |
4745 | d = dfail; | |
4746 | goto fail; | |
4747 | } | |
fa9a63c5 RM |
4748 | } |
4749 | while (--mcnt); | |
4750 | } | |
25fe55af | 4751 | break; |
fa9a63c5 RM |
4752 | |
4753 | ||
25fe55af | 4754 | /* Match any character except possibly a newline or a null. */ |
fa9a63c5 | 4755 | case anychar: |
e934739e RS |
4756 | { |
4757 | int buf_charlen; | |
e71b1971 | 4758 | unsigned int buf_ch; |
fa9a63c5 | 4759 | |
e934739e | 4760 | DEBUG_PRINT1 ("EXECUTING anychar.\n"); |
fa9a63c5 | 4761 | |
e934739e | 4762 | PREFETCH (); |
fa9a63c5 | 4763 | |
e934739e RS |
4764 | #ifdef emacs |
4765 | if (multibyte) | |
4766 | buf_ch = STRING_CHAR_AND_LENGTH (d, dend - d, buf_charlen); | |
4767 | else | |
4768 | #endif /* not emacs */ | |
4769 | { | |
66f0296e | 4770 | buf_ch = *d; |
e934739e RS |
4771 | buf_charlen = 1; |
4772 | } | |
4773 | ||
4774 | buf_ch = TRANSLATE (buf_ch); | |
4775 | ||
4776 | if ((!(bufp->syntax & RE_DOT_NEWLINE) | |
4777 | && buf_ch == '\n') | |
4778 | || ((bufp->syntax & RE_DOT_NOT_NULL) | |
4779 | && buf_ch == '\000')) | |
4780 | goto fail; | |
4781 | ||
e934739e RS |
4782 | DEBUG_PRINT2 (" Matched `%d'.\n", *d); |
4783 | d += buf_charlen; | |
4784 | } | |
fa9a63c5 RM |
4785 | break; |
4786 | ||
4787 | ||
4788 | case charset: | |
4789 | case charset_not: | |
4790 | { | |
b18215fc | 4791 | register unsigned int c; |
fa9a63c5 | 4792 | boolean not = (re_opcode_t) *(p - 1) == charset_not; |
b18215fc RS |
4793 | int len; |
4794 | ||
4795 | /* Start of actual range_table, or end of bitmap if there is no | |
4796 | range table. */ | |
4797 | unsigned char *range_table; | |
4798 | ||
96cc36cc | 4799 | /* Nonzero if there is a range table. */ |
b18215fc RS |
4800 | int range_table_exists; |
4801 | ||
96cc36cc RS |
4802 | /* Number of ranges of range table. This is not included |
4803 | in the initial byte-length of the command. */ | |
4804 | int count = 0; | |
fa9a63c5 | 4805 | |
25fe55af | 4806 | DEBUG_PRINT2 ("EXECUTING charset%s.\n", not ? "_not" : ""); |
fa9a63c5 RM |
4807 | |
4808 | PREFETCH (); | |
66f0296e | 4809 | c = *d; |
fa9a63c5 | 4810 | |
b18215fc | 4811 | range_table_exists = CHARSET_RANGE_TABLE_EXISTS_P (&p[-1]); |
96cc36cc RS |
4812 | |
4813 | #ifdef emacs | |
b18215fc | 4814 | if (range_table_exists) |
96cc36cc RS |
4815 | { |
4816 | range_table = CHARSET_RANGE_TABLE (&p[-1]); /* Past the bitmap. */ | |
4817 | EXTRACT_NUMBER_AND_INCR (count, range_table); | |
4818 | } | |
b18215fc RS |
4819 | |
4820 | if (multibyte && BASE_LEADING_CODE_P (c)) | |
4821 | c = STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
96cc36cc | 4822 | #endif /* emacs */ |
b18215fc RS |
4823 | |
4824 | if (SINGLE_BYTE_CHAR_P (c)) | |
4825 | { /* Lookup bitmap. */ | |
4826 | c = TRANSLATE (c); /* The character to match. */ | |
4827 | len = 1; | |
4828 | ||
4829 | /* Cast to `unsigned' instead of `unsigned char' in | |
4830 | case the bit list is a full 32 bytes long. */ | |
4831 | if (c < (unsigned) (CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH) | |
96cc36cc RS |
4832 | && p[1 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH))) |
4833 | not = !not; | |
b18215fc | 4834 | } |
96cc36cc | 4835 | #ifdef emacs |
b18215fc | 4836 | else if (range_table_exists) |
96cc36cc RS |
4837 | { |
4838 | int class_bits = CHARSET_RANGE_TABLE_BITS (&p[-1]); | |
4839 | ||
4840 | if ( (class_bits & BIT_ALNUM && ISALNUM (c)) | |
4841 | | (class_bits & BIT_ALPHA && ISALPHA (c)) | |
f71b19b6 | 4842 | | (class_bits & BIT_ASCII && IS_REAL_ASCII (c)) |
96cc36cc RS |
4843 | | (class_bits & BIT_GRAPH && ISGRAPH (c)) |
4844 | | (class_bits & BIT_LOWER && ISLOWER (c)) | |
f71b19b6 DL |
4845 | | (class_bits & BIT_MULTIBYTE && !ISUNIBYTE (c)) |
4846 | | (class_bits & BIT_NONASCII && !IS_REAL_ASCII (c)) | |
96cc36cc RS |
4847 | | (class_bits & BIT_PRINT && ISPRINT (c)) |
4848 | | (class_bits & BIT_PUNCT && ISPUNCT (c)) | |
4849 | | (class_bits & BIT_SPACE && ISSPACE (c)) | |
f71b19b6 | 4850 | | (class_bits & BIT_UNIBYTE && ISUNIBYTE (c)) |
96cc36cc RS |
4851 | | (class_bits & BIT_UPPER && ISUPPER (c)) |
4852 | | (class_bits & BIT_WORD && ISWORD (c))) | |
4853 | not = !not; | |
4854 | else | |
4855 | CHARSET_LOOKUP_RANGE_TABLE_RAW (not, c, range_table, count); | |
4856 | } | |
4857 | #endif /* emacs */ | |
fa9a63c5 | 4858 | |
96cc36cc RS |
4859 | if (range_table_exists) |
4860 | p = CHARSET_RANGE_TABLE_END (range_table, count); | |
4861 | else | |
4862 | p += CHARSET_BITMAP_SIZE (&p[-1]) + 1; | |
fa9a63c5 RM |
4863 | |
4864 | if (!not) goto fail; | |
5e69f11e | 4865 | |
b18215fc | 4866 | d += len; |
fa9a63c5 RM |
4867 | break; |
4868 | } | |
4869 | ||
4870 | ||
25fe55af | 4871 | /* The beginning of a group is represented by start_memory. |
505bde11 | 4872 | The argument is the register number. The text |
25fe55af RS |
4873 | matched within the group is recorded (in the internal |
4874 | registers data structure) under the register number. */ | |
4875 | case start_memory: | |
505bde11 SM |
4876 | DEBUG_PRINT2 ("EXECUTING start_memory %d:\n", *p); |
4877 | ||
4878 | /* In case we need to undo this operation (via backtracking). */ | |
4879 | PUSH_FAILURE_REG ((unsigned int)*p); | |
fa9a63c5 | 4880 | |
25fe55af | 4881 | regstart[*p] = d; |
505bde11 | 4882 | regend[*p] = REG_UNSET_VALUE; /* probably unnecessary. -sm */ |
fa9a63c5 RM |
4883 | DEBUG_PRINT2 (" regstart: %d\n", POINTER_TO_OFFSET (regstart[*p])); |
4884 | ||
25fe55af | 4885 | /* Move past the register number and inner group count. */ |
505bde11 | 4886 | p += 1; |
25fe55af | 4887 | break; |
fa9a63c5 RM |
4888 | |
4889 | ||
25fe55af | 4890 | /* The stop_memory opcode represents the end of a group. Its |
505bde11 | 4891 | argument is the same as start_memory's: the register number. */ |
fa9a63c5 | 4892 | case stop_memory: |
505bde11 SM |
4893 | DEBUG_PRINT2 ("EXECUTING stop_memory %d:\n", *p); |
4894 | ||
4895 | assert (!REG_UNSET (regstart[*p])); | |
4896 | /* Strictly speaking, there should be code such as: | |
4897 | ||
4898 | assert (REG_UNSET (regend[*p])); | |
4899 | PUSH_FAILURE_REGSTOP ((unsigned int)*p); | |
4900 | ||
4901 | But the only info to be pushed is regend[*p] and it is known to | |
4902 | be UNSET, so there really isn't anything to push. | |
4903 | Not pushing anything, on the other hand deprives us from the | |
4904 | guarantee that regend[*p] is UNSET since undoing this operation | |
4905 | will not reset its value properly. This is not important since | |
4906 | the value will only be read on the next start_memory or at | |
4907 | the very end and both events can only happen if this stop_memory | |
4908 | is *not* undone. */ | |
fa9a63c5 | 4909 | |
25fe55af | 4910 | regend[*p] = d; |
fa9a63c5 RM |
4911 | DEBUG_PRINT2 (" regend: %d\n", POINTER_TO_OFFSET (regend[*p])); |
4912 | ||
25fe55af | 4913 | /* Move past the register number and the inner group count. */ |
505bde11 | 4914 | p += 1; |
25fe55af | 4915 | break; |
fa9a63c5 RM |
4916 | |
4917 | ||
4918 | /* \<digit> has been turned into a `duplicate' command which is | |
25fe55af RS |
4919 | followed by the numeric value of <digit> as the register number. */ |
4920 | case duplicate: | |
fa9a63c5 | 4921 | { |
66f0296e | 4922 | register re_char *d2, *dend2; |
25fe55af | 4923 | int regno = *p++; /* Get which register to match against. */ |
fa9a63c5 RM |
4924 | DEBUG_PRINT2 ("EXECUTING duplicate %d.\n", regno); |
4925 | ||
25fe55af RS |
4926 | /* Can't back reference a group which we've never matched. */ |
4927 | if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno])) | |
4928 | goto fail; | |
5e69f11e | 4929 | |
25fe55af RS |
4930 | /* Where in input to try to start matching. */ |
4931 | d2 = regstart[regno]; | |
5e69f11e | 4932 | |
99633e97 SM |
4933 | /* Remember the start point to rollback upon failure. */ |
4934 | dfail = d; | |
4935 | ||
25fe55af RS |
4936 | /* Where to stop matching; if both the place to start and |
4937 | the place to stop matching are in the same string, then | |
4938 | set to the place to stop, otherwise, for now have to use | |
4939 | the end of the first string. */ | |
fa9a63c5 | 4940 | |
25fe55af | 4941 | dend2 = ((FIRST_STRING_P (regstart[regno]) |
fa9a63c5 RM |
4942 | == FIRST_STRING_P (regend[regno])) |
4943 | ? regend[regno] : end_match_1); | |
4944 | for (;;) | |
4945 | { | |
4946 | /* If necessary, advance to next segment in register | |
25fe55af | 4947 | contents. */ |
fa9a63c5 RM |
4948 | while (d2 == dend2) |
4949 | { | |
4950 | if (dend2 == end_match_2) break; | |
4951 | if (dend2 == regend[regno]) break; | |
4952 | ||
25fe55af RS |
4953 | /* End of string1 => advance to string2. */ |
4954 | d2 = string2; | |
4955 | dend2 = regend[regno]; | |
fa9a63c5 RM |
4956 | } |
4957 | /* At end of register contents => success */ | |
4958 | if (d2 == dend2) break; | |
4959 | ||
4960 | /* If necessary, advance to next segment in data. */ | |
4961 | PREFETCH (); | |
4962 | ||
4963 | /* How many characters left in this segment to match. */ | |
4964 | mcnt = dend - d; | |
5e69f11e | 4965 | |
fa9a63c5 | 4966 | /* Want how many consecutive characters we can match in |
25fe55af RS |
4967 | one shot, so, if necessary, adjust the count. */ |
4968 | if (mcnt > dend2 - d2) | |
fa9a63c5 | 4969 | mcnt = dend2 - d2; |
5e69f11e | 4970 | |
fa9a63c5 | 4971 | /* Compare that many; failure if mismatch, else move |
25fe55af | 4972 | past them. */ |
28703c16 | 4973 | if (RE_TRANSLATE_P (translate) |
25fe55af RS |
4974 | ? bcmp_translate (d, d2, mcnt, translate) |
4975 | : bcmp (d, d2, mcnt)) | |
99633e97 SM |
4976 | { |
4977 | d = dfail; | |
4978 | goto fail; | |
4979 | } | |
fa9a63c5 | 4980 | d += mcnt, d2 += mcnt; |
fa9a63c5 RM |
4981 | } |
4982 | } | |
4983 | break; | |
4984 | ||
4985 | ||
25fe55af RS |
4986 | /* begline matches the empty string at the beginning of the string |
4987 | (unless `not_bol' is set in `bufp'), and, if | |
4988 | `newline_anchor' is set, after newlines. */ | |
fa9a63c5 | 4989 | case begline: |
25fe55af | 4990 | DEBUG_PRINT1 ("EXECUTING begline.\n"); |
5e69f11e | 4991 | |
25fe55af RS |
4992 | if (AT_STRINGS_BEG (d)) |
4993 | { | |
4994 | if (!bufp->not_bol) break; | |
4995 | } | |
4996 | else if (d[-1] == '\n' && bufp->newline_anchor) | |
4997 | { | |
4998 | break; | |
4999 | } | |
5000 | /* In all other cases, we fail. */ | |
5001 | goto fail; | |
fa9a63c5 RM |
5002 | |
5003 | ||
25fe55af | 5004 | /* endline is the dual of begline. */ |
fa9a63c5 | 5005 | case endline: |
25fe55af | 5006 | DEBUG_PRINT1 ("EXECUTING endline.\n"); |
fa9a63c5 | 5007 | |
25fe55af RS |
5008 | if (AT_STRINGS_END (d)) |
5009 | { | |
5010 | if (!bufp->not_eol) break; | |
5011 | } | |
5e69f11e | 5012 | |
25fe55af RS |
5013 | /* We have to ``prefetch'' the next character. */ |
5014 | else if ((d == end1 ? *string2 : *d) == '\n' | |
5015 | && bufp->newline_anchor) | |
5016 | { | |
5017 | break; | |
5018 | } | |
5019 | goto fail; | |
fa9a63c5 RM |
5020 | |
5021 | ||
5022 | /* Match at the very beginning of the data. */ | |
25fe55af RS |
5023 | case begbuf: |
5024 | DEBUG_PRINT1 ("EXECUTING begbuf.\n"); | |
5025 | if (AT_STRINGS_BEG (d)) | |
5026 | break; | |
5027 | goto fail; | |
fa9a63c5 RM |
5028 | |
5029 | ||
5030 | /* Match at the very end of the data. */ | |
25fe55af RS |
5031 | case endbuf: |
5032 | DEBUG_PRINT1 ("EXECUTING endbuf.\n"); | |
fa9a63c5 RM |
5033 | if (AT_STRINGS_END (d)) |
5034 | break; | |
25fe55af | 5035 | goto fail; |
5e69f11e | 5036 | |
5e69f11e | 5037 | |
25fe55af RS |
5038 | /* on_failure_keep_string_jump is used to optimize `.*\n'. It |
5039 | pushes NULL as the value for the string on the stack. Then | |
505bde11 | 5040 | `POP_FAILURE_POINT' will keep the current value for the |
25fe55af RS |
5041 | string, instead of restoring it. To see why, consider |
5042 | matching `foo\nbar' against `.*\n'. The .* matches the foo; | |
5043 | then the . fails against the \n. But the next thing we want | |
5044 | to do is match the \n against the \n; if we restored the | |
5045 | string value, we would be back at the foo. | |
5046 | ||
5047 | Because this is used only in specific cases, we don't need to | |
5048 | check all the things that `on_failure_jump' does, to make | |
5049 | sure the right things get saved on the stack. Hence we don't | |
5050 | share its code. The only reason to push anything on the | |
5051 | stack at all is that otherwise we would have to change | |
5052 | `anychar's code to do something besides goto fail in this | |
5053 | case; that seems worse than this. */ | |
5054 | case on_failure_keep_string_jump: | |
505bde11 SM |
5055 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
5056 | DEBUG_PRINT3 ("EXECUTING on_failure_keep_string_jump %d (to %p):\n", | |
5057 | mcnt, p + mcnt); | |
fa9a63c5 | 5058 | |
505bde11 SM |
5059 | PUSH_FAILURE_POINT (p - 3, NULL); |
5060 | break; | |
5061 | ||
0683b6fa SM |
5062 | /* A nasty loop is introduced by the non-greedy *? and +?. |
5063 | With such loops, the stack only ever contains one failure point | |
5064 | at a time, so that a plain on_failure_jump_loop kind of | |
5065 | cycle detection cannot work. Worse yet, such a detection | |
5066 | can not only fail to detect a cycle, but it can also wrongly | |
5067 | detect a cycle (between different instantiations of the same | |
5068 | loop. | |
5069 | So the method used for those nasty loops is a little different: | |
5070 | We use a special cycle-detection-stack-frame which is pushed | |
5071 | when the on_failure_jump_nastyloop failure-point is *popped*. | |
5072 | This special frame thus marks the beginning of one iteration | |
5073 | through the loop and we can hence easily check right here | |
5074 | whether something matched between the beginning and the end of | |
5075 | the loop. */ | |
5076 | case on_failure_jump_nastyloop: | |
5077 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
5078 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_nastyloop %d (to %p):\n", | |
5079 | mcnt, p + mcnt); | |
5080 | ||
5081 | assert ((re_opcode_t)p[-4] == no_op); | |
5082 | CHECK_INFINITE_LOOP (p - 4, d); | |
5083 | PUSH_FAILURE_POINT (p - 3, d); | |
5084 | break; | |
5085 | ||
505bde11 | 5086 | |
4e8a9132 SM |
5087 | /* Simple loop detecting on_failure_jump: just check on the |
5088 | failure stack if the same spot was already hit earlier. */ | |
505bde11 SM |
5089 | case on_failure_jump_loop: |
5090 | on_failure: | |
5091 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
5092 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_loop %d (to %p):\n", | |
5093 | mcnt, p + mcnt); | |
5094 | ||
5095 | CHECK_INFINITE_LOOP (p - 3, d); | |
5096 | PUSH_FAILURE_POINT (p - 3, d); | |
25fe55af | 5097 | break; |
fa9a63c5 RM |
5098 | |
5099 | ||
5100 | /* Uses of on_failure_jump: | |
5e69f11e | 5101 | |
25fe55af RS |
5102 | Each alternative starts with an on_failure_jump that points |
5103 | to the beginning of the next alternative. Each alternative | |
5104 | except the last ends with a jump that in effect jumps past | |
5105 | the rest of the alternatives. (They really jump to the | |
5106 | ending jump of the following alternative, because tensioning | |
5107 | these jumps is a hassle.) | |
fa9a63c5 | 5108 | |
25fe55af RS |
5109 | Repeats start with an on_failure_jump that points past both |
5110 | the repetition text and either the following jump or | |
5111 | pop_failure_jump back to this on_failure_jump. */ | |
fa9a63c5 | 5112 | case on_failure_jump: |
27c3b45d | 5113 | QUIT; |
25fe55af | 5114 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
505bde11 SM |
5115 | DEBUG_PRINT3 ("EXECUTING on_failure_jump %d (to %p):\n", |
5116 | mcnt, p + mcnt); | |
25fe55af | 5117 | |
505bde11 | 5118 | PUSH_FAILURE_POINT (p -3, d); |
25fe55af RS |
5119 | break; |
5120 | ||
4e8a9132 | 5121 | /* This operation is used for greedy *. |
505bde11 SM |
5122 | Compare the beginning of the repeat with what in the |
5123 | pattern follows its end. If we can establish that there | |
5124 | is nothing that they would both match, i.e., that we | |
5125 | would have to backtrack because of (as in, e.g., `a*a') | |
5126 | then we can use a non-backtracking loop based on | |
4e8a9132 | 5127 | on_failure_keep_string_jump instead of on_failure_jump. */ |
505bde11 | 5128 | case on_failure_jump_smart: |
27c3b45d | 5129 | QUIT; |
25fe55af | 5130 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
505bde11 SM |
5131 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_smart %d (to %p).\n", |
5132 | mcnt, p + mcnt); | |
25fe55af | 5133 | { |
505bde11 SM |
5134 | unsigned char *p1 = p; /* Next operation. */ |
5135 | unsigned char *p2 = p + mcnt; /* Destination of the jump. */ | |
fa9a63c5 | 5136 | |
505bde11 SM |
5137 | p -= 3; /* Reset so that we will re-execute the |
5138 | instruction once it's been changed. */ | |
fa9a63c5 | 5139 | |
4e8a9132 SM |
5140 | EXTRACT_NUMBER (mcnt, p2 - 2); |
5141 | ||
5142 | /* Ensure this is a indeed the trivial kind of loop | |
5143 | we are expecting. */ | |
5144 | assert (skip_one_char (p1) == p2 - 3); | |
5145 | assert ((re_opcode_t) p2[-3] == jump && p2 + mcnt == p); | |
99633e97 | 5146 | DEBUG_STATEMENT (debug += 2); |
505bde11 | 5147 | if (mutually_exclusive_p (bufp, p1, p2)) |
fa9a63c5 | 5148 | { |
505bde11 | 5149 | /* Use a fast `on_failure_keep_string_jump' loop. */ |
4e8a9132 SM |
5150 | DEBUG_PRINT1 (" smart exclusive => fast loop.\n"); |
5151 | *p = (unsigned char) on_failure_keep_string_jump; | |
5152 | STORE_NUMBER (p2 - 2, mcnt + 3); | |
25fe55af | 5153 | } |
505bde11 | 5154 | else |
fa9a63c5 | 5155 | { |
505bde11 SM |
5156 | /* Default to a safe `on_failure_jump' loop. */ |
5157 | DEBUG_PRINT1 (" smart default => slow loop.\n"); | |
4e8a9132 | 5158 | *p = (unsigned char) on_failure_jump; |
fa9a63c5 | 5159 | } |
99633e97 | 5160 | DEBUG_STATEMENT (debug -= 2); |
25fe55af | 5161 | } |
505bde11 | 5162 | break; |
25fe55af RS |
5163 | |
5164 | /* Unconditionally jump (without popping any failure points). */ | |
5165 | case jump: | |
fa9a63c5 | 5166 | unconditional_jump: |
27c3b45d | 5167 | QUIT; |
fa9a63c5 | 5168 | EXTRACT_NUMBER_AND_INCR (mcnt, p); /* Get the amount to jump. */ |
25fe55af RS |
5169 | DEBUG_PRINT2 ("EXECUTING jump %d ", mcnt); |
5170 | p += mcnt; /* Do the jump. */ | |
505bde11 | 5171 | DEBUG_PRINT2 ("(to %p).\n", p); |
25fe55af RS |
5172 | break; |
5173 | ||
5174 | ||
25fe55af RS |
5175 | /* Have to succeed matching what follows at least n times. |
5176 | After that, handle like `on_failure_jump'. */ | |
5177 | case succeed_n: | |
5178 | EXTRACT_NUMBER (mcnt, p + 2); | |
5179 | DEBUG_PRINT2 ("EXECUTING succeed_n %d.\n", mcnt); | |
5e69f11e | 5180 | |
25fe55af RS |
5181 | assert (mcnt >= 0); |
5182 | /* Originally, this is how many times we HAVE to succeed. */ | |
5183 | if (mcnt > 0) | |
5184 | { | |
5185 | mcnt--; | |
fa9a63c5 | 5186 | p += 2; |
25fe55af | 5187 | STORE_NUMBER_AND_INCR (p, mcnt); |
505bde11 | 5188 | DEBUG_PRINT3 (" Setting %p to %d.\n", p, mcnt); |
25fe55af | 5189 | } |
fa9a63c5 | 5190 | else if (mcnt == 0) |
25fe55af | 5191 | { |
505bde11 | 5192 | DEBUG_PRINT2 (" Setting two bytes from %p to no_op.\n", p+2); |
fa9a63c5 | 5193 | p[2] = (unsigned char) no_op; |
25fe55af RS |
5194 | p[3] = (unsigned char) no_op; |
5195 | goto on_failure; | |
5196 | } | |
5197 | break; | |
5198 | ||
5199 | case jump_n: | |
5200 | EXTRACT_NUMBER (mcnt, p + 2); | |
5201 | DEBUG_PRINT2 ("EXECUTING jump_n %d.\n", mcnt); | |
5202 | ||
5203 | /* Originally, this is how many times we CAN jump. */ | |
5204 | if (mcnt) | |
5205 | { | |
5206 | mcnt--; | |
5207 | STORE_NUMBER (p + 2, mcnt); | |
5e69f11e | 5208 | goto unconditional_jump; |
25fe55af RS |
5209 | } |
5210 | /* If don't have to jump any more, skip over the rest of command. */ | |
5e69f11e RM |
5211 | else |
5212 | p += 4; | |
25fe55af | 5213 | break; |
5e69f11e | 5214 | |
fa9a63c5 RM |
5215 | case set_number_at: |
5216 | { | |
25fe55af | 5217 | DEBUG_PRINT1 ("EXECUTING set_number_at.\n"); |
fa9a63c5 | 5218 | |
25fe55af RS |
5219 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
5220 | p1 = p + mcnt; | |
5221 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
505bde11 | 5222 | DEBUG_PRINT3 (" Setting %p to %d.\n", p1, mcnt); |
fa9a63c5 | 5223 | STORE_NUMBER (p1, mcnt); |
25fe55af RS |
5224 | break; |
5225 | } | |
9121ca40 KH |
5226 | |
5227 | case wordbound: | |
66f0296e SM |
5228 | case notwordbound: |
5229 | not = (re_opcode_t) *(p - 1) == notwordbound; | |
5230 | DEBUG_PRINT2 ("EXECUTING %swordbound.\n", not?"not":""); | |
fa9a63c5 | 5231 | |
99633e97 | 5232 | /* We SUCCEED (or FAIL) in one of the following cases: */ |
9121ca40 | 5233 | |
b18215fc | 5234 | /* Case 1: D is at the beginning or the end of string. */ |
9121ca40 | 5235 | if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d)) |
66f0296e | 5236 | not = !not; |
b18215fc RS |
5237 | else |
5238 | { | |
5239 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5240 | is the character at D, and S2 is the syntax of C2. */ | |
5241 | int c1, c2, s1, s2; | |
b18215fc | 5242 | #ifdef emacs |
66f0296e | 5243 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (PTR_TO_OFFSET (d - 1)); |
5d967c7a | 5244 | UPDATE_SYNTAX_TABLE (charpos); |
25fe55af | 5245 | #endif |
66f0296e SM |
5246 | /* FIXME: This does a STRING_CHAR even for unibyte buffers. */ |
5247 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); | |
b18215fc RS |
5248 | s1 = SYNTAX (c1); |
5249 | #ifdef emacs | |
5d967c7a | 5250 | UPDATE_SYNTAX_TABLE_FORWARD (charpos + 1); |
25fe55af | 5251 | #endif |
66f0296e SM |
5252 | PREFETCH (); |
5253 | /* FIXME: This does a STRING_CHAR even for unibyte buffers. */ | |
5254 | c2 = STRING_CHAR (d, dend - d); | |
b18215fc RS |
5255 | s2 = SYNTAX (c2); |
5256 | ||
5257 | if (/* Case 2: Only one of S1 and S2 is Sword. */ | |
5258 | ((s1 == Sword) != (s2 == Sword)) | |
5259 | /* Case 3: Both of S1 and S2 are Sword, and macro | |
25fe55af | 5260 | WORD_BOUNDARY_P (C1, C2) returns nonzero. */ |
b18215fc | 5261 | || ((s1 == Sword) && WORD_BOUNDARY_P (c1, c2))) |
66f0296e SM |
5262 | not = !not; |
5263 | } | |
5264 | if (not) | |
9121ca40 | 5265 | break; |
b18215fc | 5266 | else |
9121ca40 | 5267 | goto fail; |
fa9a63c5 RM |
5268 | |
5269 | case wordbeg: | |
25fe55af | 5270 | DEBUG_PRINT1 ("EXECUTING wordbeg.\n"); |
fa9a63c5 | 5271 | |
b18215fc RS |
5272 | /* We FAIL in one of the following cases: */ |
5273 | ||
25fe55af | 5274 | /* Case 1: D is at the end of string. */ |
b18215fc | 5275 | if (AT_STRINGS_END (d)) |
99633e97 | 5276 | goto fail; |
b18215fc RS |
5277 | else |
5278 | { | |
5279 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5280 | is the character at D, and S2 is the syntax of C2. */ | |
5281 | int c1, c2, s1, s2; | |
fa9a63c5 | 5282 | #ifdef emacs |
99633e97 | 5283 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (PTR_TO_OFFSET (d)); |
92432794 | 5284 | UPDATE_SYNTAX_TABLE (charpos); |
25fe55af | 5285 | #endif |
99633e97 SM |
5286 | PREFETCH (); |
5287 | /* FIXME: This does a STRING_CHAR even for unibyte buffers. */ | |
5288 | c2 = STRING_CHAR (d, dend - d); | |
b18215fc | 5289 | s2 = SYNTAX (c2); |
25fe55af | 5290 | |
b18215fc RS |
5291 | /* Case 2: S2 is not Sword. */ |
5292 | if (s2 != Sword) | |
5293 | goto fail; | |
5294 | ||
5295 | /* Case 3: D is not at the beginning of string ... */ | |
5296 | if (!AT_STRINGS_BEG (d)) | |
5297 | { | |
5298 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); | |
5299 | #ifdef emacs | |
5d967c7a | 5300 | UPDATE_SYNTAX_TABLE_BACKWARD (charpos - 1); |
25fe55af | 5301 | #endif |
b18215fc RS |
5302 | s1 = SYNTAX (c1); |
5303 | ||
5304 | /* ... and S1 is Sword, and WORD_BOUNDARY_P (C1, C2) | |
25fe55af | 5305 | returns 0. */ |
b18215fc RS |
5306 | if ((s1 == Sword) && !WORD_BOUNDARY_P (c1, c2)) |
5307 | goto fail; | |
5308 | } | |
5309 | } | |
e318085a RS |
5310 | break; |
5311 | ||
b18215fc | 5312 | case wordend: |
25fe55af | 5313 | DEBUG_PRINT1 ("EXECUTING wordend.\n"); |
b18215fc RS |
5314 | |
5315 | /* We FAIL in one of the following cases: */ | |
5316 | ||
5317 | /* Case 1: D is at the beginning of string. */ | |
5318 | if (AT_STRINGS_BEG (d)) | |
e318085a | 5319 | goto fail; |
b18215fc RS |
5320 | else |
5321 | { | |
5322 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5323 | is the character at D, and S2 is the syntax of C2. */ | |
5324 | int c1, c2, s1, s2; | |
5d967c7a | 5325 | #ifdef emacs |
99633e97 | 5326 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (PTR_TO_OFFSET (d) - 1); |
92432794 | 5327 | UPDATE_SYNTAX_TABLE (charpos); |
5d967c7a | 5328 | #endif |
99633e97 | 5329 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); |
b18215fc RS |
5330 | s1 = SYNTAX (c1); |
5331 | ||
5332 | /* Case 2: S1 is not Sword. */ | |
5333 | if (s1 != Sword) | |
5334 | goto fail; | |
5335 | ||
5336 | /* Case 3: D is not at the end of string ... */ | |
5337 | if (!AT_STRINGS_END (d)) | |
5338 | { | |
66f0296e | 5339 | PREFETCH (); |
99633e97 | 5340 | /* FIXME: This does a STRING_CHAR even for unibyte buffers. */ |
66f0296e | 5341 | c2 = STRING_CHAR (d, dend - d); |
5d967c7a RS |
5342 | #ifdef emacs |
5343 | UPDATE_SYNTAX_TABLE_FORWARD (charpos); | |
5344 | #endif | |
b18215fc RS |
5345 | s2 = SYNTAX (c2); |
5346 | ||
5347 | /* ... and S2 is Sword, and WORD_BOUNDARY_P (C1, C2) | |
25fe55af | 5348 | returns 0. */ |
b18215fc | 5349 | if ((s2 == Sword) && !WORD_BOUNDARY_P (c1, c2)) |
25fe55af | 5350 | goto fail; |
b18215fc RS |
5351 | } |
5352 | } | |
e318085a RS |
5353 | break; |
5354 | ||
fa9a63c5 | 5355 | case syntaxspec: |
1fb352e0 SM |
5356 | case notsyntaxspec: |
5357 | not = (re_opcode_t) *(p - 1) == notsyntaxspec; | |
fa9a63c5 | 5358 | mcnt = *p++; |
1fb352e0 | 5359 | DEBUG_PRINT3 ("EXECUTING %ssyntaxspec %d.\n", not?"not":"", mcnt); |
fa9a63c5 | 5360 | PREFETCH (); |
b18215fc RS |
5361 | #ifdef emacs |
5362 | { | |
92432794 | 5363 | int pos1 = SYNTAX_TABLE_BYTE_TO_CHAR (PTR_TO_OFFSET (d)); |
b18215fc RS |
5364 | UPDATE_SYNTAX_TABLE (pos1); |
5365 | } | |
25fe55af | 5366 | #endif |
b18215fc RS |
5367 | { |
5368 | int c, len; | |
5369 | ||
5370 | if (multibyte) | |
5371 | /* we must concern about multibyte form, ... */ | |
5372 | c = STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
5373 | else | |
5374 | /* everything should be handled as ASCII, even though it | |
5375 | looks like multibyte form. */ | |
5376 | c = *d, len = 1; | |
5377 | ||
990b2375 | 5378 | if ((SYNTAX (c) != (enum syntaxcode) mcnt) ^ not) |
1fb352e0 | 5379 | goto fail; |
b18215fc RS |
5380 | d += len; |
5381 | } | |
fa9a63c5 RM |
5382 | break; |
5383 | ||
b18215fc | 5384 | #ifdef emacs |
1fb352e0 SM |
5385 | case before_dot: |
5386 | DEBUG_PRINT1 ("EXECUTING before_dot.\n"); | |
5387 | if (PTR_BYTE_POS (d) >= PT_BYTE) | |
fa9a63c5 | 5388 | goto fail; |
b18215fc RS |
5389 | break; |
5390 | ||
1fb352e0 SM |
5391 | case at_dot: |
5392 | DEBUG_PRINT1 ("EXECUTING at_dot.\n"); | |
5393 | if (PTR_BYTE_POS (d) != PT_BYTE) | |
5394 | goto fail; | |
5395 | break; | |
b18215fc | 5396 | |
1fb352e0 SM |
5397 | case after_dot: |
5398 | DEBUG_PRINT1 ("EXECUTING after_dot.\n"); | |
5399 | if (PTR_BYTE_POS (d) <= PT_BYTE) | |
5400 | goto fail; | |
e318085a | 5401 | break; |
fa9a63c5 | 5402 | |
1fb352e0 | 5403 | case categoryspec: |
b18215fc | 5404 | case notcategoryspec: |
1fb352e0 | 5405 | not = (re_opcode_t) *(p - 1) == notcategoryspec; |
b18215fc | 5406 | mcnt = *p++; |
1fb352e0 | 5407 | DEBUG_PRINT3 ("EXECUTING %scategoryspec %d.\n", not?"not":"", mcnt); |
b18215fc RS |
5408 | PREFETCH (); |
5409 | { | |
5410 | int c, len; | |
5411 | ||
5412 | if (multibyte) | |
5413 | c = STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
5414 | else | |
5415 | c = *d, len = 1; | |
5416 | ||
1fb352e0 | 5417 | if ((!CHAR_HAS_CATEGORY (c, mcnt)) ^ not) |
b18215fc RS |
5418 | goto fail; |
5419 | d += len; | |
5420 | } | |
fa9a63c5 | 5421 | break; |
5e69f11e | 5422 | |
1fb352e0 | 5423 | #endif /* emacs */ |
5e69f11e | 5424 | |
b18215fc RS |
5425 | default: |
5426 | abort (); | |
fa9a63c5 | 5427 | } |
b18215fc | 5428 | continue; /* Successfully executed one pattern command; keep going. */ |
fa9a63c5 RM |
5429 | |
5430 | ||
5431 | /* We goto here if a matching operation fails. */ | |
5432 | fail: | |
27c3b45d | 5433 | QUIT; |
fa9a63c5 | 5434 | if (!FAIL_STACK_EMPTY ()) |
505bde11 | 5435 | { |
66f0296e | 5436 | re_char *str; |
505bde11 SM |
5437 | unsigned char *pat; |
5438 | /* A restart point is known. Restore to that state. */ | |
b18215fc | 5439 | DEBUG_PRINT1 ("\nFAIL:\n"); |
505bde11 SM |
5440 | POP_FAILURE_POINT (str, pat); |
5441 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *pat++)) | |
5442 | { | |
5443 | case on_failure_keep_string_jump: | |
5444 | assert (str == NULL); | |
5445 | goto continue_failure_jump; | |
5446 | ||
0683b6fa SM |
5447 | case on_failure_jump_nastyloop: |
5448 | assert ((re_opcode_t)pat[-2] == no_op); | |
5449 | PUSH_FAILURE_POINT (pat - 2, str); | |
5450 | /* Fallthrough */ | |
5451 | ||
505bde11 SM |
5452 | case on_failure_jump_loop: |
5453 | case on_failure_jump: | |
5454 | case succeed_n: | |
5455 | d = str; | |
5456 | continue_failure_jump: | |
5457 | EXTRACT_NUMBER_AND_INCR (mcnt, pat); | |
5458 | p = pat + mcnt; | |
5459 | break; | |
b18215fc | 5460 | |
0683b6fa SM |
5461 | case no_op: |
5462 | /* A special frame used for nastyloops. */ | |
5463 | goto fail; | |
5464 | ||
505bde11 SM |
5465 | default: |
5466 | abort(); | |
5467 | } | |
fa9a63c5 | 5468 | |
505bde11 | 5469 | assert (p >= bufp->buffer && p <= pend); |
b18215fc RS |
5470 | |
5471 | if (d >= string1 && d <= end1) | |
fa9a63c5 | 5472 | dend = end_match_1; |
b18215fc | 5473 | } |
fa9a63c5 | 5474 | else |
b18215fc | 5475 | break; /* Matching at this starting point really fails. */ |
fa9a63c5 RM |
5476 | } /* for (;;) */ |
5477 | ||
5478 | if (best_regs_set) | |
5479 | goto restore_best_regs; | |
5480 | ||
5481 | FREE_VARIABLES (); | |
5482 | ||
b18215fc | 5483 | return -1; /* Failure to match. */ |
fa9a63c5 RM |
5484 | } /* re_match_2 */ |
5485 | \f | |
5486 | /* Subroutine definitions for re_match_2. */ | |
5487 | ||
fa9a63c5 RM |
5488 | /* Return zero if TRANSLATE[S1] and TRANSLATE[S2] are identical for LEN |
5489 | bytes; nonzero otherwise. */ | |
5e69f11e | 5490 | |
fa9a63c5 RM |
5491 | static int |
5492 | bcmp_translate (s1, s2, len, translate) | |
5493 | unsigned char *s1, *s2; | |
5494 | register int len; | |
6676cb1c | 5495 | RE_TRANSLATE_TYPE translate; |
fa9a63c5 RM |
5496 | { |
5497 | register unsigned char *p1 = s1, *p2 = s2; | |
e934739e RS |
5498 | unsigned char *p1_end = s1 + len; |
5499 | unsigned char *p2_end = s2 + len; | |
5500 | ||
5501 | while (p1 != p1_end && p2 != p2_end) | |
fa9a63c5 | 5502 | { |
e934739e RS |
5503 | int p1_charlen, p2_charlen; |
5504 | int p1_ch, p2_ch; | |
5505 | ||
99633e97 | 5506 | /* FIXME: This assumes `multibyte = true'. */ |
e934739e RS |
5507 | p1_ch = STRING_CHAR_AND_LENGTH (p1, p1_end - p1, p1_charlen); |
5508 | p2_ch = STRING_CHAR_AND_LENGTH (p2, p2_end - p2, p2_charlen); | |
5509 | ||
5510 | if (RE_TRANSLATE (translate, p1_ch) | |
5511 | != RE_TRANSLATE (translate, p2_ch)) | |
bc192b5b | 5512 | return 1; |
e934739e RS |
5513 | |
5514 | p1 += p1_charlen, p2 += p2_charlen; | |
fa9a63c5 | 5515 | } |
e934739e RS |
5516 | |
5517 | if (p1 != p1_end || p2 != p2_end) | |
5518 | return 1; | |
5519 | ||
fa9a63c5 RM |
5520 | return 0; |
5521 | } | |
5522 | \f | |
5523 | /* Entry points for GNU code. */ | |
5524 | ||
5525 | /* re_compile_pattern is the GNU regular expression compiler: it | |
5526 | compiles PATTERN (of length SIZE) and puts the result in BUFP. | |
5527 | Returns 0 if the pattern was valid, otherwise an error string. | |
5e69f11e | 5528 | |
fa9a63c5 RM |
5529 | Assumes the `allocated' (and perhaps `buffer') and `translate' fields |
5530 | are set in BUFP on entry. | |
5e69f11e | 5531 | |
b18215fc | 5532 | We call regex_compile to do the actual compilation. */ |
fa9a63c5 RM |
5533 | |
5534 | const char * | |
5535 | re_compile_pattern (pattern, length, bufp) | |
5536 | const char *pattern; | |
5537 | int length; | |
5538 | struct re_pattern_buffer *bufp; | |
5539 | { | |
5540 | reg_errcode_t ret; | |
5e69f11e | 5541 | |
fa9a63c5 RM |
5542 | /* GNU code is written to assume at least RE_NREGS registers will be set |
5543 | (and at least one extra will be -1). */ | |
5544 | bufp->regs_allocated = REGS_UNALLOCATED; | |
5e69f11e | 5545 | |
fa9a63c5 RM |
5546 | /* And GNU code determines whether or not to get register information |
5547 | by passing null for the REGS argument to re_match, etc., not by | |
5548 | setting no_sub. */ | |
5549 | bufp->no_sub = 0; | |
5e69f11e | 5550 | |
b18215fc | 5551 | /* Match anchors at newline. */ |
fa9a63c5 | 5552 | bufp->newline_anchor = 1; |
5e69f11e | 5553 | |
fa9a63c5 RM |
5554 | ret = regex_compile (pattern, length, re_syntax_options, bufp); |
5555 | ||
5556 | if (!ret) | |
5557 | return NULL; | |
5558 | return gettext (re_error_msgid[(int) ret]); | |
5e69f11e | 5559 | } |
fa9a63c5 | 5560 | \f |
b18215fc RS |
5561 | /* Entry points compatible with 4.2 BSD regex library. We don't define |
5562 | them unless specifically requested. */ | |
fa9a63c5 | 5563 | |
0c085854 | 5564 | #if defined (_REGEX_RE_COMP) || defined (_LIBC) |
fa9a63c5 RM |
5565 | |
5566 | /* BSD has one and only one pattern buffer. */ | |
5567 | static struct re_pattern_buffer re_comp_buf; | |
5568 | ||
5569 | char * | |
48afdd44 RM |
5570 | #ifdef _LIBC |
5571 | /* Make these definitions weak in libc, so POSIX programs can redefine | |
5572 | these names if they don't use our functions, and still use | |
5573 | regcomp/regexec below without link errors. */ | |
5574 | weak_function | |
5575 | #endif | |
fa9a63c5 RM |
5576 | re_comp (s) |
5577 | const char *s; | |
5578 | { | |
5579 | reg_errcode_t ret; | |
5e69f11e | 5580 | |
fa9a63c5 RM |
5581 | if (!s) |
5582 | { | |
5583 | if (!re_comp_buf.buffer) | |
5584 | return gettext ("No previous regular expression"); | |
5585 | return 0; | |
5586 | } | |
5587 | ||
5588 | if (!re_comp_buf.buffer) | |
5589 | { | |
5590 | re_comp_buf.buffer = (unsigned char *) malloc (200); | |
5591 | if (re_comp_buf.buffer == NULL) | |
b18215fc | 5592 | return gettext (re_error_msgid[(int) REG_ESPACE]); |
fa9a63c5 RM |
5593 | re_comp_buf.allocated = 200; |
5594 | ||
5595 | re_comp_buf.fastmap = (char *) malloc (1 << BYTEWIDTH); | |
5596 | if (re_comp_buf.fastmap == NULL) | |
5597 | return gettext (re_error_msgid[(int) REG_ESPACE]); | |
5598 | } | |
5599 | ||
5600 | /* Since `re_exec' always passes NULL for the `regs' argument, we | |
5601 | don't need to initialize the pattern buffer fields which affect it. */ | |
5602 | ||
b18215fc | 5603 | /* Match anchors at newlines. */ |
fa9a63c5 RM |
5604 | re_comp_buf.newline_anchor = 1; |
5605 | ||
5606 | ret = regex_compile (s, strlen (s), re_syntax_options, &re_comp_buf); | |
5e69f11e | 5607 | |
fa9a63c5 RM |
5608 | if (!ret) |
5609 | return NULL; | |
5610 | ||
5611 | /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */ | |
5612 | return (char *) gettext (re_error_msgid[(int) ret]); | |
5613 | } | |
5614 | ||
5615 | ||
5616 | int | |
48afdd44 RM |
5617 | #ifdef _LIBC |
5618 | weak_function | |
5619 | #endif | |
fa9a63c5 RM |
5620 | re_exec (s) |
5621 | const char *s; | |
5622 | { | |
5623 | const int len = strlen (s); | |
5624 | return | |
5625 | 0 <= re_search (&re_comp_buf, s, len, 0, len, (struct re_registers *) 0); | |
5626 | } | |
5627 | #endif /* _REGEX_RE_COMP */ | |
5628 | \f | |
5629 | /* POSIX.2 functions. Don't define these for Emacs. */ | |
5630 | ||
5631 | #ifndef emacs | |
5632 | ||
5633 | /* regcomp takes a regular expression as a string and compiles it. | |
5634 | ||
b18215fc | 5635 | PREG is a regex_t *. We do not expect any fields to be initialized, |
fa9a63c5 RM |
5636 | since POSIX says we shouldn't. Thus, we set |
5637 | ||
5638 | `buffer' to the compiled pattern; | |
5639 | `used' to the length of the compiled pattern; | |
5640 | `syntax' to RE_SYNTAX_POSIX_EXTENDED if the | |
5641 | REG_EXTENDED bit in CFLAGS is set; otherwise, to | |
5642 | RE_SYNTAX_POSIX_BASIC; | |
5643 | `newline_anchor' to REG_NEWLINE being set in CFLAGS; | |
5644 | `fastmap' and `fastmap_accurate' to zero; | |
5645 | `re_nsub' to the number of subexpressions in PATTERN. | |
5646 | ||
5647 | PATTERN is the address of the pattern string. | |
5648 | ||
5649 | CFLAGS is a series of bits which affect compilation. | |
5650 | ||
5651 | If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we | |
5652 | use POSIX basic syntax. | |
5653 | ||
5654 | If REG_NEWLINE is set, then . and [^...] don't match newline. | |
5655 | Also, regexec will try a match beginning after every newline. | |
5656 | ||
5657 | If REG_ICASE is set, then we considers upper- and lowercase | |
5658 | versions of letters to be equivalent when matching. | |
5659 | ||
5660 | If REG_NOSUB is set, then when PREG is passed to regexec, that | |
5661 | routine will report only success or failure, and nothing about the | |
5662 | registers. | |
5663 | ||
b18215fc | 5664 | It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for |
fa9a63c5 RM |
5665 | the return codes and their meanings.) */ |
5666 | ||
5667 | int | |
5668 | regcomp (preg, pattern, cflags) | |
5669 | regex_t *preg; | |
5e69f11e | 5670 | const char *pattern; |
fa9a63c5 RM |
5671 | int cflags; |
5672 | { | |
5673 | reg_errcode_t ret; | |
5674 | unsigned syntax | |
5675 | = (cflags & REG_EXTENDED) ? | |
5676 | RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC; | |
5677 | ||
5678 | /* regex_compile will allocate the space for the compiled pattern. */ | |
5679 | preg->buffer = 0; | |
5680 | preg->allocated = 0; | |
5681 | preg->used = 0; | |
5e69f11e | 5682 | |
fa9a63c5 RM |
5683 | /* Don't bother to use a fastmap when searching. This simplifies the |
5684 | REG_NEWLINE case: if we used a fastmap, we'd have to put all the | |
5685 | characters after newlines into the fastmap. This way, we just try | |
5686 | every character. */ | |
5687 | preg->fastmap = 0; | |
5e69f11e | 5688 | |
fa9a63c5 RM |
5689 | if (cflags & REG_ICASE) |
5690 | { | |
5691 | unsigned i; | |
5e69f11e | 5692 | |
6676cb1c RS |
5693 | preg->translate |
5694 | = (RE_TRANSLATE_TYPE) malloc (CHAR_SET_SIZE | |
5695 | * sizeof (*(RE_TRANSLATE_TYPE)0)); | |
fa9a63c5 | 5696 | if (preg->translate == NULL) |
b18215fc | 5697 | return (int) REG_ESPACE; |
fa9a63c5 RM |
5698 | |
5699 | /* Map uppercase characters to corresponding lowercase ones. */ | |
5700 | for (i = 0; i < CHAR_SET_SIZE; i++) | |
b18215fc | 5701 | preg->translate[i] = ISUPPER (i) ? tolower (i) : i; |
fa9a63c5 RM |
5702 | } |
5703 | else | |
5704 | preg->translate = NULL; | |
5705 | ||
5706 | /* If REG_NEWLINE is set, newlines are treated differently. */ | |
5707 | if (cflags & REG_NEWLINE) | |
5708 | { /* REG_NEWLINE implies neither . nor [^...] match newline. */ | |
5709 | syntax &= ~RE_DOT_NEWLINE; | |
5710 | syntax |= RE_HAT_LISTS_NOT_NEWLINE; | |
b18215fc | 5711 | /* It also changes the matching behavior. */ |
fa9a63c5 RM |
5712 | preg->newline_anchor = 1; |
5713 | } | |
5714 | else | |
5715 | preg->newline_anchor = 0; | |
5716 | ||
5717 | preg->no_sub = !!(cflags & REG_NOSUB); | |
5718 | ||
5e69f11e | 5719 | /* POSIX says a null character in the pattern terminates it, so we |
fa9a63c5 RM |
5720 | can use strlen here in compiling the pattern. */ |
5721 | ret = regex_compile (pattern, strlen (pattern), syntax, preg); | |
5e69f11e | 5722 | |
fa9a63c5 RM |
5723 | /* POSIX doesn't distinguish between an unmatched open-group and an |
5724 | unmatched close-group: both are REG_EPAREN. */ | |
5725 | if (ret == REG_ERPAREN) ret = REG_EPAREN; | |
5e69f11e | 5726 | |
fa9a63c5 RM |
5727 | return (int) ret; |
5728 | } | |
5729 | ||
5730 | ||
5731 | /* regexec searches for a given pattern, specified by PREG, in the | |
5732 | string STRING. | |
5e69f11e | 5733 | |
fa9a63c5 | 5734 | If NMATCH is zero or REG_NOSUB was set in the cflags argument to |
b18215fc | 5735 | `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at |
fa9a63c5 RM |
5736 | least NMATCH elements, and we set them to the offsets of the |
5737 | corresponding matched substrings. | |
5e69f11e | 5738 | |
fa9a63c5 RM |
5739 | EFLAGS specifies `execution flags' which affect matching: if |
5740 | REG_NOTBOL is set, then ^ does not match at the beginning of the | |
5741 | string; if REG_NOTEOL is set, then $ does not match at the end. | |
5e69f11e | 5742 | |
fa9a63c5 RM |
5743 | We return 0 if we find a match and REG_NOMATCH if not. */ |
5744 | ||
5745 | int | |
5746 | regexec (preg, string, nmatch, pmatch, eflags) | |
5747 | const regex_t *preg; | |
5e69f11e RM |
5748 | const char *string; |
5749 | size_t nmatch; | |
5750 | regmatch_t pmatch[]; | |
fa9a63c5 RM |
5751 | int eflags; |
5752 | { | |
5753 | int ret; | |
5754 | struct re_registers regs; | |
5755 | regex_t private_preg; | |
5756 | int len = strlen (string); | |
5757 | boolean want_reg_info = !preg->no_sub && nmatch > 0; | |
5758 | ||
5759 | private_preg = *preg; | |
5e69f11e | 5760 | |
fa9a63c5 RM |
5761 | private_preg.not_bol = !!(eflags & REG_NOTBOL); |
5762 | private_preg.not_eol = !!(eflags & REG_NOTEOL); | |
5e69f11e | 5763 | |
fa9a63c5 RM |
5764 | /* The user has told us exactly how many registers to return |
5765 | information about, via `nmatch'. We have to pass that on to the | |
b18215fc | 5766 | matching routines. */ |
fa9a63c5 | 5767 | private_preg.regs_allocated = REGS_FIXED; |
5e69f11e | 5768 | |
fa9a63c5 RM |
5769 | if (want_reg_info) |
5770 | { | |
5771 | regs.num_regs = nmatch; | |
5772 | regs.start = TALLOC (nmatch, regoff_t); | |
5773 | regs.end = TALLOC (nmatch, regoff_t); | |
5774 | if (regs.start == NULL || regs.end == NULL) | |
b18215fc | 5775 | return (int) REG_NOMATCH; |
fa9a63c5 RM |
5776 | } |
5777 | ||
5778 | /* Perform the searching operation. */ | |
5779 | ret = re_search (&private_preg, string, len, | |
b18215fc RS |
5780 | /* start: */ 0, /* range: */ len, |
5781 | want_reg_info ? ®s : (struct re_registers *) 0); | |
5e69f11e | 5782 | |
fa9a63c5 RM |
5783 | /* Copy the register information to the POSIX structure. */ |
5784 | if (want_reg_info) | |
5785 | { | |
5786 | if (ret >= 0) | |
b18215fc RS |
5787 | { |
5788 | unsigned r; | |
fa9a63c5 | 5789 | |
b18215fc RS |
5790 | for (r = 0; r < nmatch; r++) |
5791 | { | |
5792 | pmatch[r].rm_so = regs.start[r]; | |
5793 | pmatch[r].rm_eo = regs.end[r]; | |
5794 | } | |
5795 | } | |
fa9a63c5 | 5796 | |
b18215fc | 5797 | /* If we needed the temporary register info, free the space now. */ |
fa9a63c5 RM |
5798 | free (regs.start); |
5799 | free (regs.end); | |
5800 | } | |
5801 | ||
5802 | /* We want zero return to mean success, unlike `re_search'. */ | |
5803 | return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH; | |
5804 | } | |
5805 | ||
5806 | ||
5807 | /* Returns a message corresponding to an error code, ERRCODE, returned | |
5808 | from either regcomp or regexec. We don't use PREG here. */ | |
5809 | ||
5810 | size_t | |
5811 | regerror (errcode, preg, errbuf, errbuf_size) | |
5812 | int errcode; | |
5813 | const regex_t *preg; | |
5814 | char *errbuf; | |
5815 | size_t errbuf_size; | |
5816 | { | |
5817 | const char *msg; | |
5818 | size_t msg_size; | |
5819 | ||
5820 | if (errcode < 0 | |
5821 | || errcode >= (sizeof (re_error_msgid) / sizeof (re_error_msgid[0]))) | |
5e69f11e | 5822 | /* Only error codes returned by the rest of the code should be passed |
b18215fc | 5823 | to this routine. If we are given anything else, or if other regex |
fa9a63c5 RM |
5824 | code generates an invalid error code, then the program has a bug. |
5825 | Dump core so we can fix it. */ | |
5826 | abort (); | |
5827 | ||
5828 | msg = gettext (re_error_msgid[errcode]); | |
5829 | ||
5830 | msg_size = strlen (msg) + 1; /* Includes the null. */ | |
5e69f11e | 5831 | |
fa9a63c5 RM |
5832 | if (errbuf_size != 0) |
5833 | { | |
5834 | if (msg_size > errbuf_size) | |
b18215fc RS |
5835 | { |
5836 | strncpy (errbuf, msg, errbuf_size - 1); | |
5837 | errbuf[errbuf_size - 1] = 0; | |
5838 | } | |
fa9a63c5 | 5839 | else |
b18215fc | 5840 | strcpy (errbuf, msg); |
fa9a63c5 RM |
5841 | } |
5842 | ||
5843 | return msg_size; | |
5844 | } | |
5845 | ||
5846 | ||
5847 | /* Free dynamically allocated space used by PREG. */ | |
5848 | ||
5849 | void | |
5850 | regfree (preg) | |
5851 | regex_t *preg; | |
5852 | { | |
5853 | if (preg->buffer != NULL) | |
5854 | free (preg->buffer); | |
5855 | preg->buffer = NULL; | |
5e69f11e | 5856 | |
fa9a63c5 RM |
5857 | preg->allocated = 0; |
5858 | preg->used = 0; | |
5859 | ||
5860 | if (preg->fastmap != NULL) | |
5861 | free (preg->fastmap); | |
5862 | preg->fastmap = NULL; | |
5863 | preg->fastmap_accurate = 0; | |
5864 | ||
5865 | if (preg->translate != NULL) | |
5866 | free (preg->translate); | |
5867 | preg->translate = NULL; | |
5868 | } | |
5869 | ||
5870 | #endif /* not emacs */ |