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 | ||
b18215fc | 5 | Copyright (C) 1993, 1994, 1995, 1996, 1997 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 RM |
21 | |
22 | /* AIX requires this to be the first thing in the file. */ | |
23 | #if defined (_AIX) && !defined (REGEX_MALLOC) | |
24 | #pragma alloca | |
25 | #endif | |
26 | ||
68d96f02 | 27 | #undef _GNU_SOURCE |
fa9a63c5 RM |
28 | #define _GNU_SOURCE |
29 | ||
25fe55af RS |
30 | /* Converts the pointer to the char to BEG-based offset from the start. */ |
31 | #define PTR_TO_OFFSET(d) \ | |
b18215fc RS |
32 | POS_AS_IN_BUFFER (MATCHING_IN_FIRST_STRING \ |
33 | ? (d) - string1 : (d) - (string2 - size1)) | |
34 | #define POS_AS_IN_BUFFER(p) ((p) + 1) | |
35 | ||
fa9a63c5 RM |
36 | #ifdef HAVE_CONFIG_H |
37 | #include <config.h> | |
38 | #endif | |
39 | ||
25fe55af | 40 | /* We need this for `regex.h', and perhaps for the Emacs include files. */ |
fa9a63c5 RM |
41 | #include <sys/types.h> |
42 | ||
25fe55af | 43 | /* This is for other GNU distributions with internationalized messages. */ |
fa9a63c5 RM |
44 | #if HAVE_LIBINTL_H || defined (_LIBC) |
45 | # include <libintl.h> | |
46 | #else | |
47 | # define gettext(msgid) (msgid) | |
48 | #endif | |
49 | ||
5e69f11e RM |
50 | #ifndef gettext_noop |
51 | /* This define is so xgettext can find the internationalizable | |
52 | strings. */ | |
53 | #define gettext_noop(String) String | |
54 | #endif | |
55 | ||
fa9a63c5 RM |
56 | /* The `emacs' switch turns on certain matching commands |
57 | that make sense only in Emacs. */ | |
58 | #ifdef emacs | |
59 | ||
60 | #include "lisp.h" | |
61 | #include "buffer.h" | |
b18215fc RS |
62 | |
63 | /* Make syntax table lookup grant data in gl_state. */ | |
64 | #define SYNTAX_ENTRY_VIA_PROPERTY | |
65 | ||
fa9a63c5 | 66 | #include "syntax.h" |
b18215fc RS |
67 | #include "charset.h" |
68 | #include "category.h" | |
fa9a63c5 | 69 | |
9abbd165 RS |
70 | #define malloc xmalloc |
71 | #define free xfree | |
72 | ||
fa9a63c5 RM |
73 | #else /* not emacs */ |
74 | ||
75 | /* If we are not linking with Emacs proper, | |
76 | we can't use the relocating allocator | |
77 | even if config.h says that we can. */ | |
78 | #undef REL_ALLOC | |
79 | ||
80 | #if defined (STDC_HEADERS) || defined (_LIBC) | |
81 | #include <stdlib.h> | |
82 | #else | |
83 | char *malloc (); | |
84 | char *realloc (); | |
85 | #endif | |
86 | ||
9e4ecb26 | 87 | /* When used in Emacs's lib-src, we need to get bzero and bcopy somehow. |
25fe55af | 88 | If nothing else has been done, use the method below. */ |
9e4ecb26 KH |
89 | #ifdef INHIBIT_STRING_HEADER |
90 | #if !(defined (HAVE_BZERO) && defined (HAVE_BCOPY)) | |
91 | #if !defined (bzero) && !defined (bcopy) | |
92 | #undef INHIBIT_STRING_HEADER | |
93 | #endif | |
94 | #endif | |
95 | #endif | |
96 | ||
97 | /* This is the normal way of making sure we have a bcopy and a bzero. | |
98 | This is used in most programs--a few other programs avoid this | |
99 | by defining INHIBIT_STRING_HEADER. */ | |
fa9a63c5 | 100 | #ifndef INHIBIT_STRING_HEADER |
7f998252 | 101 | #if defined (HAVE_STRING_H) || defined (STDC_HEADERS) || defined (_LIBC) |
fa9a63c5 RM |
102 | #include <string.h> |
103 | #ifndef bcmp | |
104 | #define bcmp(s1, s2, n) memcmp ((s1), (s2), (n)) | |
105 | #endif | |
106 | #ifndef bcopy | |
107 | #define bcopy(s, d, n) memcpy ((d), (s), (n)) | |
108 | #endif | |
109 | #ifndef bzero | |
110 | #define bzero(s, n) memset ((s), 0, (n)) | |
111 | #endif | |
112 | #else | |
113 | #include <strings.h> | |
114 | #endif | |
115 | #endif | |
116 | ||
117 | /* Define the syntax stuff for \<, \>, etc. */ | |
118 | ||
119 | /* This must be nonzero for the wordchar and notwordchar pattern | |
120 | commands in re_match_2. */ | |
5e69f11e | 121 | #ifndef Sword |
fa9a63c5 RM |
122 | #define Sword 1 |
123 | #endif | |
124 | ||
125 | #ifdef SWITCH_ENUM_BUG | |
126 | #define SWITCH_ENUM_CAST(x) ((int)(x)) | |
127 | #else | |
128 | #define SWITCH_ENUM_CAST(x) (x) | |
129 | #endif | |
130 | ||
131 | #ifdef SYNTAX_TABLE | |
132 | ||
133 | extern char *re_syntax_table; | |
134 | ||
135 | #else /* not SYNTAX_TABLE */ | |
136 | ||
137 | /* How many characters in the character set. */ | |
138 | #define CHAR_SET_SIZE 256 | |
139 | ||
140 | static char re_syntax_table[CHAR_SET_SIZE]; | |
141 | ||
142 | static void | |
143 | init_syntax_once () | |
144 | { | |
145 | register int c; | |
146 | static int done = 0; | |
147 | ||
148 | if (done) | |
149 | return; | |
150 | ||
151 | bzero (re_syntax_table, sizeof re_syntax_table); | |
152 | ||
153 | for (c = 'a'; c <= 'z'; c++) | |
154 | re_syntax_table[c] = Sword; | |
155 | ||
156 | for (c = 'A'; c <= 'Z'; c++) | |
157 | re_syntax_table[c] = Sword; | |
158 | ||
159 | for (c = '0'; c <= '9'; c++) | |
160 | re_syntax_table[c] = Sword; | |
161 | ||
162 | re_syntax_table['_'] = Sword; | |
163 | ||
164 | done = 1; | |
165 | } | |
166 | ||
167 | #endif /* not SYNTAX_TABLE */ | |
168 | ||
169 | #define SYNTAX(c) re_syntax_table[c] | |
170 | ||
b18215fc RS |
171 | /* Dummy macro for non emacs environments. */ |
172 | #define BASE_LEADING_CODE_P(c) (0) | |
173 | #define WORD_BOUNDARY_P(c1, c2) (0) | |
174 | #define CHAR_HEAD_P(p) (1) | |
175 | #define SINGLE_BYTE_CHAR_P(c) (1) | |
176 | #define SAME_CHARSET_P(c1, c2) (1) | |
177 | #define MULTIBYTE_FORM_LENGTH(p, s) (1) | |
178 | #define STRING_CHAR(p, s) (*(p)) | |
179 | #define STRING_CHAR_AND_LENGTH(p, s, actual_len) ((actual_len) = 1, *(p)) | |
180 | #define GET_CHAR_AFTER_2(c, p, str1, end1, str2, end2) \ | |
181 | (c = ((p) == (end1) ? *(str2) : *(p))) | |
182 | #define GET_CHAR_BEFORE_2(c, p, str1, end1, str2, end2) \ | |
183 | (c = ((p) == (str2) ? *((end1) - 1) : *((p) - 1))) | |
fa9a63c5 RM |
184 | #endif /* not emacs */ |
185 | \f | |
186 | /* Get the interface, including the syntax bits. */ | |
187 | #include "regex.h" | |
188 | ||
189 | /* isalpha etc. are used for the character classes. */ | |
190 | #include <ctype.h> | |
191 | ||
192 | /* Jim Meyering writes: | |
193 | ||
194 | "... Some ctype macros are valid only for character codes that | |
195 | isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when | |
196 | using /bin/cc or gcc but without giving an ansi option). So, all | |
25fe55af | 197 | ctype uses should be through macros like ISPRINT... If |
fa9a63c5 RM |
198 | STDC_HEADERS is defined, then autoconf has verified that the ctype |
199 | macros don't need to be guarded with references to isascii. ... | |
200 | Defining isascii to 1 should let any compiler worth its salt | |
25fe55af | 201 | eliminate the && through constant folding." */ |
fa9a63c5 RM |
202 | |
203 | #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) | |
204 | #define ISASCII(c) 1 | |
205 | #else | |
206 | #define ISASCII(c) isascii(c) | |
207 | #endif | |
208 | ||
209 | #ifdef isblank | |
210 | #define ISBLANK(c) (ISASCII (c) && isblank (c)) | |
211 | #else | |
212 | #define ISBLANK(c) ((c) == ' ' || (c) == '\t') | |
213 | #endif | |
214 | #ifdef isgraph | |
215 | #define ISGRAPH(c) (ISASCII (c) && isgraph (c)) | |
216 | #else | |
217 | #define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c)) | |
218 | #endif | |
219 | ||
220 | #define ISPRINT(c) (ISASCII (c) && isprint (c)) | |
221 | #define ISDIGIT(c) (ISASCII (c) && isdigit (c)) | |
222 | #define ISALNUM(c) (ISASCII (c) && isalnum (c)) | |
223 | #define ISALPHA(c) (ISASCII (c) && isalpha (c)) | |
224 | #define ISCNTRL(c) (ISASCII (c) && iscntrl (c)) | |
225 | #define ISLOWER(c) (ISASCII (c) && islower (c)) | |
226 | #define ISPUNCT(c) (ISASCII (c) && ispunct (c)) | |
227 | #define ISSPACE(c) (ISASCII (c) && isspace (c)) | |
228 | #define ISUPPER(c) (ISASCII (c) && isupper (c)) | |
229 | #define ISXDIGIT(c) (ISASCII (c) && isxdigit (c)) | |
230 | ||
231 | #ifndef NULL | |
075f06ec | 232 | #define NULL (void *)0 |
fa9a63c5 RM |
233 | #endif |
234 | ||
235 | /* We remove any previous definition of `SIGN_EXTEND_CHAR', | |
236 | since ours (we hope) works properly with all combinations of | |
237 | machines, compilers, `char' and `unsigned char' argument types. | |
25fe55af | 238 | (Per Bothner suggested the basic approach.) */ |
fa9a63c5 RM |
239 | #undef SIGN_EXTEND_CHAR |
240 | #if __STDC__ | |
241 | #define SIGN_EXTEND_CHAR(c) ((signed char) (c)) | |
242 | #else /* not __STDC__ */ | |
243 | /* As in Harbison and Steele. */ | |
244 | #define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128) | |
245 | #endif | |
246 | \f | |
247 | /* Should we use malloc or alloca? If REGEX_MALLOC is not defined, we | |
248 | use `alloca' instead of `malloc'. This is because using malloc in | |
249 | re_search* or re_match* could cause memory leaks when C-g is used in | |
250 | Emacs; also, malloc is slower and causes storage fragmentation. On | |
5e69f11e RM |
251 | the other hand, malloc is more portable, and easier to debug. |
252 | ||
fa9a63c5 RM |
253 | Because we sometimes use alloca, some routines have to be macros, |
254 | not functions -- `alloca'-allocated space disappears at the end of the | |
255 | function it is called in. */ | |
256 | ||
257 | #ifdef REGEX_MALLOC | |
258 | ||
259 | #define REGEX_ALLOCATE malloc | |
260 | #define REGEX_REALLOCATE(source, osize, nsize) realloc (source, nsize) | |
261 | #define REGEX_FREE free | |
262 | ||
263 | #else /* not REGEX_MALLOC */ | |
264 | ||
265 | /* Emacs already defines alloca, sometimes. */ | |
266 | #ifndef alloca | |
267 | ||
268 | /* Make alloca work the best possible way. */ | |
269 | #ifdef __GNUC__ | |
270 | #define alloca __builtin_alloca | |
271 | #else /* not __GNUC__ */ | |
272 | #if HAVE_ALLOCA_H | |
273 | #include <alloca.h> | |
274 | #else /* not __GNUC__ or HAVE_ALLOCA_H */ | |
f3c4387f | 275 | #if 0 /* It is a bad idea to declare alloca. We always cast the result. */ |
25fe55af | 276 | #ifndef _AIX /* Already did AIX, up at the top. */ |
fa9a63c5 RM |
277 | char *alloca (); |
278 | #endif /* not _AIX */ | |
f3c4387f | 279 | #endif |
5e69f11e | 280 | #endif /* not HAVE_ALLOCA_H */ |
fa9a63c5 RM |
281 | #endif /* not __GNUC__ */ |
282 | ||
283 | #endif /* not alloca */ | |
284 | ||
285 | #define REGEX_ALLOCATE alloca | |
286 | ||
287 | /* Assumes a `char *destination' variable. */ | |
288 | #define REGEX_REALLOCATE(source, osize, nsize) \ | |
289 | (destination = (char *) alloca (nsize), \ | |
290 | bcopy (source, destination, osize), \ | |
291 | destination) | |
292 | ||
293 | /* No need to do anything to free, after alloca. */ | |
c2e1680a | 294 | #define REGEX_FREE(arg) ((void)0) /* Do nothing! But inhibit gcc warning. */ |
fa9a63c5 RM |
295 | |
296 | #endif /* not REGEX_MALLOC */ | |
297 | ||
298 | /* Define how to allocate the failure stack. */ | |
299 | ||
33487cc8 | 300 | #if defined (REL_ALLOC) && defined (REGEX_MALLOC) |
4297555e | 301 | |
fa9a63c5 RM |
302 | #define REGEX_ALLOCATE_STACK(size) \ |
303 | r_alloc (&failure_stack_ptr, (size)) | |
304 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) \ | |
305 | r_re_alloc (&failure_stack_ptr, (nsize)) | |
306 | #define REGEX_FREE_STACK(ptr) \ | |
307 | r_alloc_free (&failure_stack_ptr) | |
308 | ||
4297555e | 309 | #else /* not using relocating allocator */ |
fa9a63c5 RM |
310 | |
311 | #ifdef REGEX_MALLOC | |
312 | ||
313 | #define REGEX_ALLOCATE_STACK malloc | |
314 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) realloc (source, nsize) | |
315 | #define REGEX_FREE_STACK free | |
316 | ||
317 | #else /* not REGEX_MALLOC */ | |
318 | ||
319 | #define REGEX_ALLOCATE_STACK alloca | |
320 | ||
321 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) \ | |
322 | REGEX_REALLOCATE (source, osize, nsize) | |
25fe55af | 323 | /* No need to explicitly free anything. */ |
fa9a63c5 RM |
324 | #define REGEX_FREE_STACK(arg) |
325 | ||
326 | #endif /* not REGEX_MALLOC */ | |
4297555e | 327 | #endif /* not using relocating allocator */ |
fa9a63c5 RM |
328 | |
329 | ||
330 | /* True if `size1' is non-NULL and PTR is pointing anywhere inside | |
331 | `string1' or just past its end. This works if PTR is NULL, which is | |
332 | a good thing. */ | |
25fe55af | 333 | #define FIRST_STRING_P(ptr) \ |
fa9a63c5 RM |
334 | (size1 && string1 <= (ptr) && (ptr) <= string1 + size1) |
335 | ||
336 | /* (Re)Allocate N items of type T using malloc, or fail. */ | |
337 | #define TALLOC(n, t) ((t *) malloc ((n) * sizeof (t))) | |
338 | #define RETALLOC(addr, n, t) ((addr) = (t *) realloc (addr, (n) * sizeof (t))) | |
339 | #define RETALLOC_IF(addr, n, t) \ | |
340 | if (addr) RETALLOC((addr), (n), t); else (addr) = TALLOC ((n), t) | |
341 | #define REGEX_TALLOC(n, t) ((t *) REGEX_ALLOCATE ((n) * sizeof (t))) | |
342 | ||
25fe55af | 343 | #define BYTEWIDTH 8 /* In bits. */ |
fa9a63c5 RM |
344 | |
345 | #define STREQ(s1, s2) ((strcmp (s1, s2) == 0)) | |
346 | ||
347 | #undef MAX | |
348 | #undef MIN | |
349 | #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
350 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
351 | ||
352 | typedef char boolean; | |
353 | #define false 0 | |
354 | #define true 1 | |
355 | ||
356 | static int re_match_2_internal (); | |
357 | \f | |
358 | /* These are the command codes that appear in compiled regular | |
25fe55af | 359 | expressions. Some opcodes are followed by argument bytes. A |
fa9a63c5 RM |
360 | command code can specify any interpretation whatsoever for its |
361 | arguments. Zero bytes may appear in the compiled regular expression. */ | |
362 | ||
363 | typedef enum | |
364 | { | |
365 | no_op = 0, | |
366 | ||
25fe55af | 367 | /* Succeed right away--no more backtracking. */ |
fa9a63c5 RM |
368 | succeed, |
369 | ||
25fe55af | 370 | /* Followed by one byte giving n, then by n literal bytes. */ |
fa9a63c5 RM |
371 | exactn, |
372 | ||
25fe55af | 373 | /* Matches any (more or less) character. */ |
fa9a63c5 RM |
374 | anychar, |
375 | ||
25fe55af RS |
376 | /* Matches any one char belonging to specified set. First |
377 | following byte is number of bitmap bytes. Then come bytes | |
378 | for a bitmap saying which chars are in. Bits in each byte | |
379 | are ordered low-bit-first. A character is in the set if its | |
380 | bit is 1. A character too large to have a bit in the map is | |
381 | automatically not in the set. */ | |
fa9a63c5 RM |
382 | charset, |
383 | ||
25fe55af RS |
384 | /* Same parameters as charset, but match any character that is |
385 | not one of those specified. */ | |
fa9a63c5 RM |
386 | charset_not, |
387 | ||
25fe55af RS |
388 | /* Start remembering the text that is matched, for storing in a |
389 | register. Followed by one byte with the register number, in | |
390 | the range 0 to one less than the pattern buffer's re_nsub | |
391 | field. Then followed by one byte with the number of groups | |
392 | inner to this one. (This last has to be part of the | |
393 | start_memory only because we need it in the on_failure_jump | |
394 | of re_match_2.) */ | |
fa9a63c5 RM |
395 | start_memory, |
396 | ||
25fe55af RS |
397 | /* Stop remembering the text that is matched and store it in a |
398 | memory register. Followed by one byte with the register | |
399 | number, in the range 0 to one less than `re_nsub' in the | |
400 | pattern buffer, and one byte with the number of inner groups, | |
401 | just like `start_memory'. (We need the number of inner | |
402 | groups here because we don't have any easy way of finding the | |
403 | corresponding start_memory when we're at a stop_memory.) */ | |
fa9a63c5 RM |
404 | stop_memory, |
405 | ||
25fe55af RS |
406 | /* Match a duplicate of something remembered. Followed by one |
407 | byte containing the register number. */ | |
fa9a63c5 RM |
408 | duplicate, |
409 | ||
25fe55af | 410 | /* Fail unless at beginning of line. */ |
fa9a63c5 RM |
411 | begline, |
412 | ||
25fe55af | 413 | /* Fail unless at end of line. */ |
fa9a63c5 RM |
414 | endline, |
415 | ||
25fe55af RS |
416 | /* Succeeds if at beginning of buffer (if emacs) or at beginning |
417 | of string to be matched (if not). */ | |
fa9a63c5 RM |
418 | begbuf, |
419 | ||
25fe55af | 420 | /* Analogously, for end of buffer/string. */ |
fa9a63c5 | 421 | endbuf, |
5e69f11e | 422 | |
25fe55af | 423 | /* Followed by two byte relative address to which to jump. */ |
5e69f11e | 424 | jump, |
fa9a63c5 RM |
425 | |
426 | /* Same as jump, but marks the end of an alternative. */ | |
427 | jump_past_alt, | |
428 | ||
25fe55af RS |
429 | /* Followed by two-byte relative address of place to resume at |
430 | in case of failure. */ | |
fa9a63c5 | 431 | on_failure_jump, |
5e69f11e | 432 | |
25fe55af RS |
433 | /* Like on_failure_jump, but pushes a placeholder instead of the |
434 | current string position when executed. */ | |
fa9a63c5 | 435 | on_failure_keep_string_jump, |
5e69f11e | 436 | |
25fe55af RS |
437 | /* Throw away latest failure point and then jump to following |
438 | two-byte relative address. */ | |
fa9a63c5 RM |
439 | pop_failure_jump, |
440 | ||
25fe55af RS |
441 | /* Change to pop_failure_jump if know won't have to backtrack to |
442 | match; otherwise change to jump. This is used to jump | |
443 | back to the beginning of a repeat. If what follows this jump | |
444 | clearly won't match what the repeat does, such that we can be | |
445 | sure that there is no use backtracking out of repetitions | |
446 | already matched, then we change it to a pop_failure_jump. | |
447 | Followed by two-byte address. */ | |
fa9a63c5 RM |
448 | maybe_pop_jump, |
449 | ||
25fe55af RS |
450 | /* Jump to following two-byte address, and push a dummy failure |
451 | point. This failure point will be thrown away if an attempt | |
452 | is made to use it for a failure. A `+' construct makes this | |
453 | before the first repeat. Also used as an intermediary kind | |
454 | of jump when compiling an alternative. */ | |
fa9a63c5 RM |
455 | dummy_failure_jump, |
456 | ||
457 | /* Push a dummy failure point and continue. Used at the end of | |
458 | alternatives. */ | |
459 | push_dummy_failure, | |
460 | ||
25fe55af RS |
461 | /* Followed by two-byte relative address and two-byte number n. |
462 | After matching N times, jump to the address upon failure. */ | |
fa9a63c5 RM |
463 | succeed_n, |
464 | ||
25fe55af RS |
465 | /* Followed by two-byte relative address, and two-byte number n. |
466 | Jump to the address N times, then fail. */ | |
fa9a63c5 RM |
467 | jump_n, |
468 | ||
25fe55af RS |
469 | /* Set the following two-byte relative address to the |
470 | subsequent two-byte number. The address *includes* the two | |
471 | bytes of number. */ | |
fa9a63c5 RM |
472 | set_number_at, |
473 | ||
474 | wordchar, /* Matches any word-constituent character. */ | |
475 | notwordchar, /* Matches any char that is not a word-constituent. */ | |
476 | ||
477 | wordbeg, /* Succeeds if at word beginning. */ | |
478 | wordend, /* Succeeds if at word end. */ | |
479 | ||
480 | wordbound, /* Succeeds if at a word boundary. */ | |
25fe55af | 481 | notwordbound /* Succeeds if not at a word boundary. */ |
fa9a63c5 RM |
482 | |
483 | #ifdef emacs | |
484 | ,before_dot, /* Succeeds if before point. */ | |
485 | at_dot, /* Succeeds if at point. */ | |
486 | after_dot, /* Succeeds if after point. */ | |
487 | ||
488 | /* Matches any character whose syntax is specified. Followed by | |
25fe55af | 489 | a byte which contains a syntax code, e.g., Sword. */ |
fa9a63c5 RM |
490 | syntaxspec, |
491 | ||
492 | /* Matches any character whose syntax is not that specified. */ | |
b18215fc RS |
493 | notsyntaxspec, |
494 | ||
495 | /* Matches any character whose category-set contains the specified | |
25fe55af RS |
496 | category. The operator is followed by a byte which contains a |
497 | category code (mnemonic ASCII character). */ | |
b18215fc RS |
498 | categoryspec, |
499 | ||
500 | /* Matches any character whose category-set does not contain the | |
501 | specified category. The operator is followed by a byte which | |
502 | contains the category code (mnemonic ASCII character). */ | |
503 | notcategoryspec | |
fa9a63c5 RM |
504 | #endif /* emacs */ |
505 | } re_opcode_t; | |
506 | \f | |
507 | /* Common operations on the compiled pattern. */ | |
508 | ||
509 | /* Store NUMBER in two contiguous bytes starting at DESTINATION. */ | |
510 | ||
511 | #define STORE_NUMBER(destination, number) \ | |
512 | do { \ | |
513 | (destination)[0] = (number) & 0377; \ | |
514 | (destination)[1] = (number) >> 8; \ | |
515 | } while (0) | |
516 | ||
517 | /* Same as STORE_NUMBER, except increment DESTINATION to | |
518 | the byte after where the number is stored. Therefore, DESTINATION | |
519 | must be an lvalue. */ | |
520 | ||
521 | #define STORE_NUMBER_AND_INCR(destination, number) \ | |
522 | do { \ | |
523 | STORE_NUMBER (destination, number); \ | |
524 | (destination) += 2; \ | |
525 | } while (0) | |
526 | ||
527 | /* Put into DESTINATION a number stored in two contiguous bytes starting | |
528 | at SOURCE. */ | |
529 | ||
530 | #define EXTRACT_NUMBER(destination, source) \ | |
531 | do { \ | |
532 | (destination) = *(source) & 0377; \ | |
533 | (destination) += SIGN_EXTEND_CHAR (*((source) + 1)) << 8; \ | |
534 | } while (0) | |
535 | ||
536 | #ifdef DEBUG | |
537 | static void | |
538 | extract_number (dest, source) | |
539 | int *dest; | |
540 | unsigned char *source; | |
541 | { | |
5e69f11e | 542 | int temp = SIGN_EXTEND_CHAR (*(source + 1)); |
fa9a63c5 RM |
543 | *dest = *source & 0377; |
544 | *dest += temp << 8; | |
545 | } | |
546 | ||
25fe55af | 547 | #ifndef EXTRACT_MACROS /* To debug the macros. */ |
fa9a63c5 RM |
548 | #undef EXTRACT_NUMBER |
549 | #define EXTRACT_NUMBER(dest, src) extract_number (&dest, src) | |
550 | #endif /* not EXTRACT_MACROS */ | |
551 | ||
552 | #endif /* DEBUG */ | |
553 | ||
554 | /* Same as EXTRACT_NUMBER, except increment SOURCE to after the number. | |
555 | SOURCE must be an lvalue. */ | |
556 | ||
557 | #define EXTRACT_NUMBER_AND_INCR(destination, source) \ | |
558 | do { \ | |
559 | EXTRACT_NUMBER (destination, source); \ | |
25fe55af | 560 | (source) += 2; \ |
fa9a63c5 RM |
561 | } while (0) |
562 | ||
563 | #ifdef DEBUG | |
564 | static void | |
565 | extract_number_and_incr (destination, source) | |
566 | int *destination; | |
567 | unsigned char **source; | |
5e69f11e | 568 | { |
fa9a63c5 RM |
569 | extract_number (destination, *source); |
570 | *source += 2; | |
571 | } | |
572 | ||
573 | #ifndef EXTRACT_MACROS | |
574 | #undef EXTRACT_NUMBER_AND_INCR | |
575 | #define EXTRACT_NUMBER_AND_INCR(dest, src) \ | |
576 | extract_number_and_incr (&dest, &src) | |
577 | #endif /* not EXTRACT_MACROS */ | |
578 | ||
579 | #endif /* DEBUG */ | |
580 | \f | |
b18215fc RS |
581 | /* Store a multibyte character in three contiguous bytes starting |
582 | DESTINATION, and increment DESTINATION to the byte after where the | |
25fe55af | 583 | character is stored. Therefore, DESTINATION must be an lvalue. */ |
b18215fc RS |
584 | |
585 | #define STORE_CHARACTER_AND_INCR(destination, character) \ | |
586 | do { \ | |
587 | (destination)[0] = (character) & 0377; \ | |
588 | (destination)[1] = ((character) >> 8) & 0377; \ | |
589 | (destination)[2] = (character) >> 16; \ | |
590 | (destination) += 3; \ | |
591 | } while (0) | |
592 | ||
593 | /* Put into DESTINATION a character stored in three contiguous bytes | |
25fe55af | 594 | starting at SOURCE. */ |
b18215fc RS |
595 | |
596 | #define EXTRACT_CHARACTER(destination, source) \ | |
597 | do { \ | |
598 | (destination) = ((source)[0] \ | |
599 | | ((source)[1] << 8) \ | |
600 | | ((source)[2] << 16)); \ | |
601 | } while (0) | |
602 | ||
603 | ||
604 | /* Macros for charset. */ | |
605 | ||
606 | /* Size of bitmap of charset P in bytes. P is a start of charset, | |
607 | i.e. *P is (re_opcode_t) charset or (re_opcode_t) charset_not. */ | |
608 | #define CHARSET_BITMAP_SIZE(p) ((p)[1] & 0x7F) | |
609 | ||
610 | /* Nonzero if charset P has range table. */ | |
25fe55af | 611 | #define CHARSET_RANGE_TABLE_EXISTS_P(p) ((p)[1] & 0x80) |
b18215fc RS |
612 | |
613 | /* Return the address of range table of charset P. But not the start | |
614 | of table itself, but the before where the number of ranges is | |
25fe55af | 615 | stored. `2 +' means to skip re_opcode_t and size of bitmap. */ |
b18215fc RS |
616 | #define CHARSET_RANGE_TABLE(p) (&(p)[2 + CHARSET_BITMAP_SIZE (p)]) |
617 | ||
618 | /* Test if C is listed in the bitmap of charset P. */ | |
619 | #define CHARSET_LOOKUP_BITMAP(p, c) \ | |
620 | ((c) < CHARSET_BITMAP_SIZE (p) * BYTEWIDTH \ | |
621 | && (p)[2 + (c) / BYTEWIDTH] & (1 << ((c) % BYTEWIDTH))) | |
622 | ||
623 | /* Return the address of end of RANGE_TABLE. COUNT is number of | |
25fe55af RS |
624 | ranges (which is a pair of (start, end)) in the RANGE_TABLE. `* 2' |
625 | is start of range and end of range. `* 3' is size of each start | |
b18215fc RS |
626 | and end. */ |
627 | #define CHARSET_RANGE_TABLE_END(range_table, count) \ | |
628 | ((range_table) + (count) * 2 * 3) | |
629 | ||
25fe55af | 630 | /* Test if C is in RANGE_TABLE. A flag NOT is negated if C is in. |
b18215fc RS |
631 | COUNT is number of ranges in RANGE_TABLE. */ |
632 | #define CHARSET_LOOKUP_RANGE_TABLE_RAW(not, c, range_table, count) \ | |
633 | do \ | |
634 | { \ | |
635 | int range_start, range_end; \ | |
636 | unsigned char *p; \ | |
637 | unsigned char *range_table_end \ | |
638 | = CHARSET_RANGE_TABLE_END ((range_table), (count)); \ | |
639 | \ | |
640 | for (p = (range_table); p < range_table_end; p += 2 * 3) \ | |
641 | { \ | |
642 | EXTRACT_CHARACTER (range_start, p); \ | |
643 | EXTRACT_CHARACTER (range_end, p + 3); \ | |
644 | \ | |
645 | if (range_start <= (c) && (c) <= range_end) \ | |
646 | { \ | |
647 | (not) = !(not); \ | |
648 | break; \ | |
649 | } \ | |
650 | } \ | |
651 | } \ | |
652 | while (0) | |
653 | ||
654 | /* Test if C is in range table of CHARSET. The flag NOT is negated if | |
655 | C is listed in it. */ | |
656 | #define CHARSET_LOOKUP_RANGE_TABLE(not, c, charset) \ | |
657 | do \ | |
658 | { \ | |
659 | /* Number of ranges in range table. */ \ | |
660 | int count; \ | |
661 | unsigned char *range_table = CHARSET_RANGE_TABLE (charset); \ | |
662 | \ | |
663 | EXTRACT_NUMBER_AND_INCR (count, range_table); \ | |
664 | CHARSET_LOOKUP_RANGE_TABLE_RAW ((not), (c), range_table, count); \ | |
665 | } \ | |
666 | while (0) | |
667 | \f | |
fa9a63c5 RM |
668 | /* If DEBUG is defined, Regex prints many voluminous messages about what |
669 | it is doing (if the variable `debug' is nonzero). If linked with the | |
670 | main program in `iregex.c', you can enter patterns and strings | |
671 | interactively. And if linked with the main program in `main.c' and | |
25fe55af | 672 | the other test files, you can run the already-written tests. */ |
fa9a63c5 RM |
673 | |
674 | #ifdef DEBUG | |
675 | ||
676 | /* We use standard I/O for debugging. */ | |
677 | #include <stdio.h> | |
678 | ||
679 | /* It is useful to test things that ``must'' be true when debugging. */ | |
680 | #include <assert.h> | |
681 | ||
682 | static int debug = 0; | |
683 | ||
684 | #define DEBUG_STATEMENT(e) e | |
685 | #define DEBUG_PRINT1(x) if (debug) printf (x) | |
686 | #define DEBUG_PRINT2(x1, x2) if (debug) printf (x1, x2) | |
687 | #define DEBUG_PRINT3(x1, x2, x3) if (debug) printf (x1, x2, x3) | |
688 | #define DEBUG_PRINT4(x1, x2, x3, x4) if (debug) printf (x1, x2, x3, x4) | |
25fe55af | 689 | #define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) \ |
fa9a63c5 RM |
690 | if (debug) print_partial_compiled_pattern (s, e) |
691 | #define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) \ | |
692 | if (debug) print_double_string (w, s1, sz1, s2, sz2) | |
693 | ||
694 | ||
695 | /* Print the fastmap in human-readable form. */ | |
696 | ||
697 | void | |
698 | print_fastmap (fastmap) | |
699 | char *fastmap; | |
700 | { | |
701 | unsigned was_a_range = 0; | |
5e69f11e RM |
702 | unsigned i = 0; |
703 | ||
fa9a63c5 RM |
704 | while (i < (1 << BYTEWIDTH)) |
705 | { | |
706 | if (fastmap[i++]) | |
707 | { | |
708 | was_a_range = 0; | |
25fe55af RS |
709 | putchar (i - 1); |
710 | while (i < (1 << BYTEWIDTH) && fastmap[i]) | |
711 | { | |
712 | was_a_range = 1; | |
713 | i++; | |
714 | } | |
fa9a63c5 | 715 | if (was_a_range) |
25fe55af RS |
716 | { |
717 | printf ("-"); | |
718 | putchar (i - 1); | |
719 | } | |
720 | } | |
fa9a63c5 | 721 | } |
5e69f11e | 722 | putchar ('\n'); |
fa9a63c5 RM |
723 | } |
724 | ||
725 | ||
726 | /* Print a compiled pattern string in human-readable form, starting at | |
727 | the START pointer into it and ending just before the pointer END. */ | |
728 | ||
729 | void | |
730 | print_partial_compiled_pattern (start, end) | |
731 | unsigned char *start; | |
732 | unsigned char *end; | |
733 | { | |
734 | int mcnt, mcnt2; | |
735 | unsigned char *p = start; | |
736 | unsigned char *pend = end; | |
737 | ||
738 | if (start == NULL) | |
739 | { | |
740 | printf ("(null)\n"); | |
741 | return; | |
742 | } | |
5e69f11e | 743 | |
fa9a63c5 RM |
744 | /* Loop over pattern commands. */ |
745 | while (p < pend) | |
746 | { | |
747 | printf ("%d:\t", p - start); | |
748 | ||
749 | switch ((re_opcode_t) *p++) | |
750 | { | |
25fe55af RS |
751 | case no_op: |
752 | printf ("/no_op"); | |
753 | break; | |
fa9a63c5 RM |
754 | |
755 | case exactn: | |
756 | mcnt = *p++; | |
25fe55af RS |
757 | printf ("/exactn/%d", mcnt); |
758 | do | |
fa9a63c5 | 759 | { |
25fe55af | 760 | putchar ('/'); |
fa9a63c5 | 761 | putchar (*p++); |
25fe55af RS |
762 | } |
763 | while (--mcnt); | |
764 | break; | |
fa9a63c5 RM |
765 | |
766 | case start_memory: | |
25fe55af RS |
767 | mcnt = *p++; |
768 | printf ("/start_memory/%d/%d", mcnt, *p++); | |
769 | break; | |
fa9a63c5 RM |
770 | |
771 | case stop_memory: | |
25fe55af | 772 | mcnt = *p++; |
fa9a63c5 | 773 | printf ("/stop_memory/%d/%d", mcnt, *p++); |
25fe55af | 774 | break; |
fa9a63c5 RM |
775 | |
776 | case duplicate: | |
777 | printf ("/duplicate/%d", *p++); | |
778 | break; | |
779 | ||
780 | case anychar: | |
781 | printf ("/anychar"); | |
782 | break; | |
783 | ||
784 | case charset: | |
25fe55af RS |
785 | case charset_not: |
786 | { | |
787 | register int c, last = -100; | |
fa9a63c5 RM |
788 | register int in_range = 0; |
789 | ||
790 | printf ("/charset [%s", | |
25fe55af | 791 | (re_opcode_t) *(p - 1) == charset_not ? "^" : ""); |
5e69f11e | 792 | |
25fe55af | 793 | assert (p + *p < pend); |
fa9a63c5 | 794 | |
25fe55af | 795 | for (c = 0; c < 256; c++) |
fa9a63c5 RM |
796 | if (c / 8 < *p |
797 | && (p[1 + (c/8)] & (1 << (c % 8)))) | |
798 | { | |
799 | /* Are we starting a range? */ | |
800 | if (last + 1 == c && ! in_range) | |
801 | { | |
802 | putchar ('-'); | |
803 | in_range = 1; | |
804 | } | |
805 | /* Have we broken a range? */ | |
806 | else if (last + 1 != c && in_range) | |
25fe55af | 807 | { |
fa9a63c5 RM |
808 | putchar (last); |
809 | in_range = 0; | |
810 | } | |
5e69f11e | 811 | |
fa9a63c5 RM |
812 | if (! in_range) |
813 | putchar (c); | |
814 | ||
815 | last = c; | |
25fe55af | 816 | } |
fa9a63c5 RM |
817 | |
818 | if (in_range) | |
819 | putchar (last); | |
820 | ||
821 | putchar (']'); | |
822 | ||
823 | p += 1 + *p; | |
824 | } | |
825 | break; | |
826 | ||
827 | case begline: | |
828 | printf ("/begline"); | |
25fe55af | 829 | break; |
fa9a63c5 RM |
830 | |
831 | case endline: | |
25fe55af RS |
832 | printf ("/endline"); |
833 | break; | |
fa9a63c5 RM |
834 | |
835 | case on_failure_jump: | |
25fe55af RS |
836 | extract_number_and_incr (&mcnt, &p); |
837 | printf ("/on_failure_jump to %d", p + mcnt - start); | |
838 | break; | |
fa9a63c5 RM |
839 | |
840 | case on_failure_keep_string_jump: | |
25fe55af RS |
841 | extract_number_and_incr (&mcnt, &p); |
842 | printf ("/on_failure_keep_string_jump to %d", p + mcnt - start); | |
843 | break; | |
fa9a63c5 RM |
844 | |
845 | case dummy_failure_jump: | |
25fe55af RS |
846 | extract_number_and_incr (&mcnt, &p); |
847 | printf ("/dummy_failure_jump to %d", p + mcnt - start); | |
848 | break; | |
fa9a63c5 RM |
849 | |
850 | case push_dummy_failure: | |
25fe55af RS |
851 | printf ("/push_dummy_failure"); |
852 | break; | |
5e69f11e | 853 | |
25fe55af RS |
854 | case maybe_pop_jump: |
855 | extract_number_and_incr (&mcnt, &p); | |
856 | printf ("/maybe_pop_jump to %d", p + mcnt - start); | |
fa9a63c5 RM |
857 | break; |
858 | ||
25fe55af | 859 | case pop_failure_jump: |
fa9a63c5 | 860 | extract_number_and_incr (&mcnt, &p); |
25fe55af | 861 | printf ("/pop_failure_jump to %d", p + mcnt - start); |
5e69f11e RM |
862 | break; |
863 | ||
25fe55af | 864 | case jump_past_alt: |
fa9a63c5 | 865 | extract_number_and_incr (&mcnt, &p); |
25fe55af | 866 | printf ("/jump_past_alt to %d", p + mcnt - start); |
5e69f11e RM |
867 | break; |
868 | ||
25fe55af | 869 | case jump: |
fa9a63c5 | 870 | extract_number_and_incr (&mcnt, &p); |
25fe55af | 871 | printf ("/jump to %d", p + mcnt - start); |
fa9a63c5 RM |
872 | break; |
873 | ||
25fe55af RS |
874 | case succeed_n: |
875 | extract_number_and_incr (&mcnt, &p); | |
876 | extract_number_and_incr (&mcnt2, &p); | |
fa9a63c5 | 877 | printf ("/succeed_n to %d, %d times", p + mcnt - start, mcnt2); |
25fe55af | 878 | break; |
5e69f11e | 879 | |
25fe55af RS |
880 | case jump_n: |
881 | extract_number_and_incr (&mcnt, &p); | |
882 | extract_number_and_incr (&mcnt2, &p); | |
fa9a63c5 | 883 | printf ("/jump_n to %d, %d times", p + mcnt - start, mcnt2); |
25fe55af | 884 | break; |
5e69f11e | 885 | |
25fe55af RS |
886 | case set_number_at: |
887 | extract_number_and_incr (&mcnt, &p); | |
888 | extract_number_and_incr (&mcnt2, &p); | |
fa9a63c5 | 889 | printf ("/set_number_at location %d to %d", p + mcnt - start, mcnt2); |
25fe55af | 890 | break; |
5e69f11e | 891 | |
25fe55af | 892 | case wordbound: |
fa9a63c5 RM |
893 | printf ("/wordbound"); |
894 | break; | |
895 | ||
896 | case notwordbound: | |
897 | printf ("/notwordbound"); | |
25fe55af | 898 | break; |
fa9a63c5 RM |
899 | |
900 | case wordbeg: | |
901 | printf ("/wordbeg"); | |
902 | break; | |
5e69f11e | 903 | |
fa9a63c5 RM |
904 | case wordend: |
905 | printf ("/wordend"); | |
5e69f11e | 906 | |
fa9a63c5 RM |
907 | #ifdef emacs |
908 | case before_dot: | |
909 | printf ("/before_dot"); | |
25fe55af | 910 | break; |
fa9a63c5 RM |
911 | |
912 | case at_dot: | |
913 | printf ("/at_dot"); | |
25fe55af | 914 | break; |
fa9a63c5 RM |
915 | |
916 | case after_dot: | |
917 | printf ("/after_dot"); | |
25fe55af | 918 | break; |
fa9a63c5 RM |
919 | |
920 | case syntaxspec: | |
25fe55af | 921 | printf ("/syntaxspec"); |
fa9a63c5 RM |
922 | mcnt = *p++; |
923 | printf ("/%d", mcnt); | |
25fe55af | 924 | break; |
5e69f11e | 925 | |
fa9a63c5 | 926 | case notsyntaxspec: |
25fe55af | 927 | printf ("/notsyntaxspec"); |
fa9a63c5 RM |
928 | mcnt = *p++; |
929 | printf ("/%d", mcnt); | |
930 | break; | |
931 | #endif /* emacs */ | |
932 | ||
933 | case wordchar: | |
934 | printf ("/wordchar"); | |
25fe55af | 935 | break; |
5e69f11e | 936 | |
fa9a63c5 RM |
937 | case notwordchar: |
938 | printf ("/notwordchar"); | |
25fe55af | 939 | break; |
fa9a63c5 RM |
940 | |
941 | case begbuf: | |
942 | printf ("/begbuf"); | |
25fe55af | 943 | break; |
fa9a63c5 RM |
944 | |
945 | case endbuf: | |
946 | printf ("/endbuf"); | |
25fe55af | 947 | break; |
fa9a63c5 | 948 | |
25fe55af RS |
949 | default: |
950 | printf ("?%d", *(p-1)); | |
fa9a63c5 RM |
951 | } |
952 | ||
953 | putchar ('\n'); | |
954 | } | |
955 | ||
956 | printf ("%d:\tend of pattern.\n", p - start); | |
957 | } | |
958 | ||
959 | ||
960 | void | |
961 | print_compiled_pattern (bufp) | |
962 | struct re_pattern_buffer *bufp; | |
963 | { | |
964 | unsigned char *buffer = bufp->buffer; | |
965 | ||
966 | print_partial_compiled_pattern (buffer, buffer + bufp->used); | |
967 | printf ("%d bytes used/%d bytes allocated.\n", bufp->used, bufp->allocated); | |
968 | ||
969 | if (bufp->fastmap_accurate && bufp->fastmap) | |
970 | { | |
971 | printf ("fastmap: "); | |
972 | print_fastmap (bufp->fastmap); | |
973 | } | |
974 | ||
975 | printf ("re_nsub: %d\t", bufp->re_nsub); | |
976 | printf ("regs_alloc: %d\t", bufp->regs_allocated); | |
977 | printf ("can_be_null: %d\t", bufp->can_be_null); | |
978 | printf ("newline_anchor: %d\n", bufp->newline_anchor); | |
979 | printf ("no_sub: %d\t", bufp->no_sub); | |
980 | printf ("not_bol: %d\t", bufp->not_bol); | |
981 | printf ("not_eol: %d\t", bufp->not_eol); | |
982 | printf ("syntax: %d\n", bufp->syntax); | |
983 | /* Perhaps we should print the translate table? */ | |
984 | } | |
985 | ||
986 | ||
987 | void | |
988 | print_double_string (where, string1, size1, string2, size2) | |
989 | const char *where; | |
990 | const char *string1; | |
991 | const char *string2; | |
992 | int size1; | |
993 | int size2; | |
994 | { | |
995 | unsigned this_char; | |
5e69f11e | 996 | |
fa9a63c5 RM |
997 | if (where == NULL) |
998 | printf ("(null)"); | |
999 | else | |
1000 | { | |
1001 | if (FIRST_STRING_P (where)) | |
25fe55af RS |
1002 | { |
1003 | for (this_char = where - string1; this_char < size1; this_char++) | |
1004 | putchar (string1[this_char]); | |
fa9a63c5 | 1005 | |
25fe55af RS |
1006 | where = string2; |
1007 | } | |
fa9a63c5 RM |
1008 | |
1009 | for (this_char = where - string2; this_char < size2; this_char++) | |
25fe55af | 1010 | putchar (string2[this_char]); |
fa9a63c5 RM |
1011 | } |
1012 | } | |
1013 | ||
1014 | #else /* not DEBUG */ | |
1015 | ||
1016 | #undef assert | |
1017 | #define assert(e) | |
1018 | ||
1019 | #define DEBUG_STATEMENT(e) | |
1020 | #define DEBUG_PRINT1(x) | |
1021 | #define DEBUG_PRINT2(x1, x2) | |
1022 | #define DEBUG_PRINT3(x1, x2, x3) | |
1023 | #define DEBUG_PRINT4(x1, x2, x3, x4) | |
1024 | #define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) | |
1025 | #define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) | |
1026 | ||
1027 | #endif /* not DEBUG */ | |
1028 | \f | |
1029 | /* Set by `re_set_syntax' to the current regexp syntax to recognize. Can | |
1030 | also be assigned to arbitrarily: each pattern buffer stores its own | |
1031 | syntax, so it can be changed between regex compilations. */ | |
1032 | /* This has no initializer because initialized variables in Emacs | |
1033 | become read-only after dumping. */ | |
1034 | reg_syntax_t re_syntax_options; | |
1035 | ||
1036 | ||
1037 | /* Specify the precise syntax of regexps for compilation. This provides | |
1038 | for compatibility for various utilities which historically have | |
1039 | different, incompatible syntaxes. | |
1040 | ||
1041 | The argument SYNTAX is a bit mask comprised of the various bits | |
25fe55af | 1042 | defined in regex.h. We return the old syntax. */ |
fa9a63c5 RM |
1043 | |
1044 | reg_syntax_t | |
1045 | re_set_syntax (syntax) | |
1046 | reg_syntax_t syntax; | |
1047 | { | |
1048 | reg_syntax_t ret = re_syntax_options; | |
5e69f11e | 1049 | |
fa9a63c5 RM |
1050 | re_syntax_options = syntax; |
1051 | return ret; | |
1052 | } | |
1053 | \f | |
1054 | /* This table gives an error message for each of the error codes listed | |
25fe55af | 1055 | in regex.h. Obviously the order here has to be same as there. |
fa9a63c5 | 1056 | POSIX doesn't require that we do anything for REG_NOERROR, |
25fe55af | 1057 | but why not be nice? */ |
fa9a63c5 RM |
1058 | |
1059 | static const char *re_error_msgid[] = | |
5e69f11e RM |
1060 | { |
1061 | gettext_noop ("Success"), /* REG_NOERROR */ | |
1062 | gettext_noop ("No match"), /* REG_NOMATCH */ | |
1063 | gettext_noop ("Invalid regular expression"), /* REG_BADPAT */ | |
1064 | gettext_noop ("Invalid collation character"), /* REG_ECOLLATE */ | |
1065 | gettext_noop ("Invalid character class name"), /* REG_ECTYPE */ | |
1066 | gettext_noop ("Trailing backslash"), /* REG_EESCAPE */ | |
1067 | gettext_noop ("Invalid back reference"), /* REG_ESUBREG */ | |
1068 | gettext_noop ("Unmatched [ or [^"), /* REG_EBRACK */ | |
1069 | gettext_noop ("Unmatched ( or \\("), /* REG_EPAREN */ | |
1070 | gettext_noop ("Unmatched \\{"), /* REG_EBRACE */ | |
1071 | gettext_noop ("Invalid content of \\{\\}"), /* REG_BADBR */ | |
1072 | gettext_noop ("Invalid range end"), /* REG_ERANGE */ | |
1073 | gettext_noop ("Memory exhausted"), /* REG_ESPACE */ | |
1074 | gettext_noop ("Invalid preceding regular expression"), /* REG_BADRPT */ | |
1075 | gettext_noop ("Premature end of regular expression"), /* REG_EEND */ | |
1076 | gettext_noop ("Regular expression too big"), /* REG_ESIZE */ | |
1077 | gettext_noop ("Unmatched ) or \\)"), /* REG_ERPAREN */ | |
fa9a63c5 RM |
1078 | }; |
1079 | \f | |
25fe55af | 1080 | /* Avoiding alloca during matching, to placate r_alloc. */ |
fa9a63c5 RM |
1081 | |
1082 | /* Define MATCH_MAY_ALLOCATE unless we need to make sure that the | |
1083 | searching and matching functions should not call alloca. On some | |
1084 | systems, alloca is implemented in terms of malloc, and if we're | |
1085 | using the relocating allocator routines, then malloc could cause a | |
1086 | relocation, which might (if the strings being searched are in the | |
1087 | ralloc heap) shift the data out from underneath the regexp | |
1088 | routines. | |
1089 | ||
5e69f11e | 1090 | Here's another reason to avoid allocation: Emacs |
fa9a63c5 RM |
1091 | processes input from X in a signal handler; processing X input may |
1092 | call malloc; if input arrives while a matching routine is calling | |
1093 | malloc, then we're scrod. But Emacs can't just block input while | |
1094 | calling matching routines; then we don't notice interrupts when | |
1095 | they come in. So, Emacs blocks input around all regexp calls | |
1096 | except the matching calls, which it leaves unprotected, in the | |
1097 | faith that they will not malloc. */ | |
1098 | ||
1099 | /* Normally, this is fine. */ | |
1100 | #define MATCH_MAY_ALLOCATE | |
1101 | ||
1102 | /* When using GNU C, we are not REALLY using the C alloca, no matter | |
1103 | what config.h may say. So don't take precautions for it. */ | |
1104 | #ifdef __GNUC__ | |
1105 | #undef C_ALLOCA | |
1106 | #endif | |
1107 | ||
1108 | /* The match routines may not allocate if (1) they would do it with malloc | |
1109 | and (2) it's not safe for them to use malloc. | |
1110 | Note that if REL_ALLOC is defined, matching would not use malloc for the | |
1111 | failure stack, but we would still use it for the register vectors; | |
25fe55af | 1112 | so REL_ALLOC should not affect this. */ |
fa9a63c5 RM |
1113 | #if (defined (C_ALLOCA) || defined (REGEX_MALLOC)) && defined (emacs) |
1114 | #undef MATCH_MAY_ALLOCATE | |
1115 | #endif | |
1116 | ||
1117 | \f | |
1118 | /* Failure stack declarations and macros; both re_compile_fastmap and | |
1119 | re_match_2 use a failure stack. These have to be macros because of | |
1120 | REGEX_ALLOCATE_STACK. */ | |
5e69f11e | 1121 | |
fa9a63c5 RM |
1122 | |
1123 | /* Number of failure points for which to initially allocate space | |
1124 | when matching. If this number is exceeded, we allocate more | |
1125 | space, so it is not a hard limit. */ | |
1126 | #ifndef INIT_FAILURE_ALLOC | |
1127 | #define INIT_FAILURE_ALLOC 5 | |
1128 | #endif | |
1129 | ||
1130 | /* Roughly the maximum number of failure points on the stack. Would be | |
ffd76827 | 1131 | exactly that if always used MAX_FAILURE_ITEMS items each time we failed. |
fa9a63c5 | 1132 | This is a variable only so users of regex can assign to it; we never |
25fe55af | 1133 | change it ourselves. */ |
fa9a63c5 | 1134 | #if defined (MATCH_MAY_ALLOCATE) |
0f374b2b | 1135 | /* 4400 was enough to cause a crash on Alpha OSF/1, |
264d34bf | 1136 | whose default stack limit is 2mb. */ |
6411ab23 | 1137 | int re_max_failures = 20000; |
fa9a63c5 RM |
1138 | #else |
1139 | int re_max_failures = 2000; | |
1140 | #endif | |
1141 | ||
1142 | union fail_stack_elt | |
1143 | { | |
1144 | unsigned char *pointer; | |
1145 | int integer; | |
1146 | }; | |
1147 | ||
1148 | typedef union fail_stack_elt fail_stack_elt_t; | |
1149 | ||
1150 | typedef struct | |
1151 | { | |
1152 | fail_stack_elt_t *stack; | |
1153 | unsigned size; | |
1154 | unsigned avail; /* Offset of next open position. */ | |
1155 | } fail_stack_type; | |
1156 | ||
1157 | #define FAIL_STACK_EMPTY() (fail_stack.avail == 0) | |
1158 | #define FAIL_STACK_PTR_EMPTY() (fail_stack_ptr->avail == 0) | |
1159 | #define FAIL_STACK_FULL() (fail_stack.avail == fail_stack.size) | |
1160 | ||
1161 | ||
1162 | /* Define macros to initialize and free the failure stack. | |
1163 | Do `return -2' if the alloc fails. */ | |
1164 | ||
1165 | #ifdef MATCH_MAY_ALLOCATE | |
1166 | #define INIT_FAIL_STACK() \ | |
1167 | do { \ | |
1168 | fail_stack.stack = (fail_stack_elt_t *) \ | |
1169 | REGEX_ALLOCATE_STACK (INIT_FAILURE_ALLOC * sizeof (fail_stack_elt_t)); \ | |
1170 | \ | |
1171 | if (fail_stack.stack == NULL) \ | |
1172 | return -2; \ | |
1173 | \ | |
1174 | fail_stack.size = INIT_FAILURE_ALLOC; \ | |
1175 | fail_stack.avail = 0; \ | |
1176 | } while (0) | |
1177 | ||
1178 | #define RESET_FAIL_STACK() REGEX_FREE_STACK (fail_stack.stack) | |
1179 | #else | |
1180 | #define INIT_FAIL_STACK() \ | |
1181 | do { \ | |
1182 | fail_stack.avail = 0; \ | |
1183 | } while (0) | |
1184 | ||
1185 | #define RESET_FAIL_STACK() | |
1186 | #endif | |
1187 | ||
1188 | ||
1189 | /* Double the size of FAIL_STACK, up to approximately `re_max_failures' items. | |
1190 | ||
1191 | Return 1 if succeeds, and 0 if either ran out of memory | |
5e69f11e RM |
1192 | allocating space for it or it was already too large. |
1193 | ||
25fe55af | 1194 | REGEX_REALLOCATE_STACK requires `destination' be declared. */ |
fa9a63c5 RM |
1195 | |
1196 | #define DOUBLE_FAIL_STACK(fail_stack) \ | |
1197 | ((fail_stack).size > re_max_failures * MAX_FAILURE_ITEMS \ | |
1198 | ? 0 \ | |
1199 | : ((fail_stack).stack = (fail_stack_elt_t *) \ | |
25fe55af RS |
1200 | REGEX_REALLOCATE_STACK ((fail_stack).stack, \ |
1201 | (fail_stack).size * sizeof (fail_stack_elt_t), \ | |
1202 | ((fail_stack).size << 1) * sizeof (fail_stack_elt_t)), \ | |
fa9a63c5 RM |
1203 | \ |
1204 | (fail_stack).stack == NULL \ | |
1205 | ? 0 \ | |
25fe55af RS |
1206 | : ((fail_stack).size <<= 1, \ |
1207 | 1))) | |
fa9a63c5 RM |
1208 | |
1209 | ||
5e69f11e | 1210 | /* Push pointer POINTER on FAIL_STACK. |
fa9a63c5 RM |
1211 | Return 1 if was able to do so and 0 if ran out of memory allocating |
1212 | space to do so. */ | |
1213 | #define PUSH_PATTERN_OP(POINTER, FAIL_STACK) \ | |
1214 | ((FAIL_STACK_FULL () \ | |
1215 | && !DOUBLE_FAIL_STACK (FAIL_STACK)) \ | |
1216 | ? 0 \ | |
1217 | : ((FAIL_STACK).stack[(FAIL_STACK).avail++].pointer = POINTER, \ | |
1218 | 1)) | |
1219 | ||
1220 | /* Push a pointer value onto the failure stack. | |
1221 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1222 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1223 | #define PUSH_FAILURE_POINTER(item) \ |
1224 | fail_stack.stack[fail_stack.avail++].pointer = (unsigned char *) (item) | |
1225 | ||
1226 | /* This pushes an integer-valued item onto the failure stack. | |
1227 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1228 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1229 | #define PUSH_FAILURE_INT(item) \ |
1230 | fail_stack.stack[fail_stack.avail++].integer = (item) | |
1231 | ||
1232 | /* Push a fail_stack_elt_t value onto the failure stack. | |
1233 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1234 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1235 | #define PUSH_FAILURE_ELT(item) \ |
1236 | fail_stack.stack[fail_stack.avail++] = (item) | |
1237 | ||
1238 | /* These three POP... operations complement the three PUSH... operations. | |
1239 | All assume that `fail_stack' is nonempty. */ | |
1240 | #define POP_FAILURE_POINTER() fail_stack.stack[--fail_stack.avail].pointer | |
1241 | #define POP_FAILURE_INT() fail_stack.stack[--fail_stack.avail].integer | |
1242 | #define POP_FAILURE_ELT() fail_stack.stack[--fail_stack.avail] | |
1243 | ||
1244 | /* Used to omit pushing failure point id's when we're not debugging. */ | |
1245 | #ifdef DEBUG | |
1246 | #define DEBUG_PUSH PUSH_FAILURE_INT | |
1247 | #define DEBUG_POP(item_addr) *(item_addr) = POP_FAILURE_INT () | |
1248 | #else | |
1249 | #define DEBUG_PUSH(item) | |
1250 | #define DEBUG_POP(item_addr) | |
1251 | #endif | |
1252 | ||
1253 | ||
1254 | /* Push the information about the state we will need | |
5e69f11e RM |
1255 | if we ever fail back to it. |
1256 | ||
fa9a63c5 RM |
1257 | Requires variables fail_stack, regstart, regend, reg_info, and |
1258 | num_regs be declared. DOUBLE_FAIL_STACK requires `destination' be | |
1259 | declared. | |
5e69f11e | 1260 | |
fa9a63c5 RM |
1261 | Does `return FAILURE_CODE' if runs out of memory. */ |
1262 | ||
1263 | #define PUSH_FAILURE_POINT(pattern_place, string_place, failure_code) \ | |
1264 | do { \ | |
1265 | char *destination; \ | |
1266 | /* Must be int, so when we don't save any registers, the arithmetic \ | |
1267 | of 0 + -1 isn't done as unsigned. */ \ | |
1268 | int this_reg; \ | |
25fe55af | 1269 | \ |
fa9a63c5 RM |
1270 | DEBUG_STATEMENT (failure_id++); \ |
1271 | DEBUG_STATEMENT (nfailure_points_pushed++); \ | |
1272 | DEBUG_PRINT2 ("\nPUSH_FAILURE_POINT #%u:\n", failure_id); \ | |
1273 | DEBUG_PRINT2 (" Before push, next avail: %d\n", (fail_stack).avail);\ | |
25fe55af | 1274 | DEBUG_PRINT2 (" size: %d\n", (fail_stack).size);\ |
fa9a63c5 RM |
1275 | \ |
1276 | DEBUG_PRINT2 (" slots needed: %d\n", NUM_FAILURE_ITEMS); \ | |
25fe55af | 1277 | DEBUG_PRINT2 (" available: %d\n", REMAINING_AVAIL_SLOTS); \ |
fa9a63c5 RM |
1278 | \ |
1279 | /* Ensure we have enough space allocated for what we will push. */ \ | |
1280 | while (REMAINING_AVAIL_SLOTS < NUM_FAILURE_ITEMS) \ | |
1281 | { \ | |
25fe55af RS |
1282 | if (!DOUBLE_FAIL_STACK (fail_stack)) \ |
1283 | return failure_code; \ | |
fa9a63c5 | 1284 | \ |
25fe55af | 1285 | DEBUG_PRINT2 ("\n Doubled stack; size now: %d\n", \ |
fa9a63c5 | 1286 | (fail_stack).size); \ |
25fe55af | 1287 | DEBUG_PRINT2 (" slots available: %d\n", REMAINING_AVAIL_SLOTS);\ |
fa9a63c5 RM |
1288 | } \ |
1289 | \ | |
1290 | /* Push the info, starting with the registers. */ \ | |
1291 | DEBUG_PRINT1 ("\n"); \ | |
1292 | \ | |
68d96f02 | 1293 | if (1) \ |
faec11db RS |
1294 | for (this_reg = lowest_active_reg; this_reg <= highest_active_reg; \ |
1295 | this_reg++) \ | |
1296 | { \ | |
1297 | DEBUG_PRINT2 (" Pushing reg: %d\n", this_reg); \ | |
1298 | DEBUG_STATEMENT (num_regs_pushed++); \ | |
fa9a63c5 | 1299 | \ |
faec11db RS |
1300 | DEBUG_PRINT2 (" start: 0x%x\n", regstart[this_reg]); \ |
1301 | PUSH_FAILURE_POINTER (regstart[this_reg]); \ | |
fa9a63c5 | 1302 | \ |
faec11db RS |
1303 | DEBUG_PRINT2 (" end: 0x%x\n", regend[this_reg]); \ |
1304 | PUSH_FAILURE_POINTER (regend[this_reg]); \ | |
1305 | \ | |
1306 | DEBUG_PRINT2 (" info: 0x%x\n ", reg_info[this_reg]); \ | |
1307 | DEBUG_PRINT2 (" match_null=%d", \ | |
1308 | REG_MATCH_NULL_STRING_P (reg_info[this_reg])); \ | |
1309 | DEBUG_PRINT2 (" active=%d", IS_ACTIVE (reg_info[this_reg])); \ | |
1310 | DEBUG_PRINT2 (" matched_something=%d", \ | |
1311 | MATCHED_SOMETHING (reg_info[this_reg])); \ | |
1312 | DEBUG_PRINT2 (" ever_matched=%d", \ | |
1313 | EVER_MATCHED_SOMETHING (reg_info[this_reg])); \ | |
1314 | DEBUG_PRINT1 ("\n"); \ | |
1315 | PUSH_FAILURE_ELT (reg_info[this_reg].word); \ | |
1316 | } \ | |
fa9a63c5 RM |
1317 | \ |
1318 | DEBUG_PRINT2 (" Pushing low active reg: %d\n", lowest_active_reg);\ | |
1319 | PUSH_FAILURE_INT (lowest_active_reg); \ | |
1320 | \ | |
1321 | DEBUG_PRINT2 (" Pushing high active reg: %d\n", highest_active_reg);\ | |
1322 | PUSH_FAILURE_INT (highest_active_reg); \ | |
1323 | \ | |
1324 | DEBUG_PRINT2 (" Pushing pattern 0x%x: ", pattern_place); \ | |
1325 | DEBUG_PRINT_COMPILED_PATTERN (bufp, pattern_place, pend); \ | |
1326 | PUSH_FAILURE_POINTER (pattern_place); \ | |
1327 | \ | |
1328 | DEBUG_PRINT2 (" Pushing string 0x%x: `", string_place); \ | |
25fe55af | 1329 | DEBUG_PRINT_DOUBLE_STRING (string_place, string1, size1, string2, \ |
fa9a63c5 RM |
1330 | size2); \ |
1331 | DEBUG_PRINT1 ("'\n"); \ | |
1332 | PUSH_FAILURE_POINTER (string_place); \ | |
1333 | \ | |
1334 | DEBUG_PRINT2 (" Pushing failure id: %u\n", failure_id); \ | |
1335 | DEBUG_PUSH (failure_id); \ | |
1336 | } while (0) | |
1337 | ||
1338 | /* This is the number of items that are pushed and popped on the stack | |
1339 | for each register. */ | |
1340 | #define NUM_REG_ITEMS 3 | |
1341 | ||
1342 | /* Individual items aside from the registers. */ | |
1343 | #ifdef DEBUG | |
1344 | #define NUM_NONREG_ITEMS 5 /* Includes failure point id. */ | |
1345 | #else | |
1346 | #define NUM_NONREG_ITEMS 4 | |
1347 | #endif | |
1348 | ||
1349 | /* We push at most this many items on the stack. */ | |
ffd76827 RS |
1350 | /* We used to use (num_regs - 1), which is the number of registers |
1351 | this regexp will save; but that was changed to 5 | |
1352 | to avoid stack overflow for a regexp with lots of parens. */ | |
1353 | #define MAX_FAILURE_ITEMS (5 * NUM_REG_ITEMS + NUM_NONREG_ITEMS) | |
fa9a63c5 RM |
1354 | |
1355 | /* We actually push this many items. */ | |
faec11db | 1356 | #define NUM_FAILURE_ITEMS \ |
68d96f02 | 1357 | (((0 \ |
faec11db RS |
1358 | ? 0 : highest_active_reg - lowest_active_reg + 1) \ |
1359 | * NUM_REG_ITEMS) \ | |
1360 | + NUM_NONREG_ITEMS) | |
fa9a63c5 RM |
1361 | |
1362 | /* How many items can still be added to the stack without overflowing it. */ | |
1363 | #define REMAINING_AVAIL_SLOTS ((fail_stack).size - (fail_stack).avail) | |
1364 | ||
1365 | ||
1366 | /* Pops what PUSH_FAIL_STACK pushes. | |
1367 | ||
1368 | We restore into the parameters, all of which should be lvalues: | |
1369 | STR -- the saved data position. | |
1370 | PAT -- the saved pattern position. | |
1371 | LOW_REG, HIGH_REG -- the highest and lowest active registers. | |
1372 | REGSTART, REGEND -- arrays of string positions. | |
1373 | REG_INFO -- array of information about each subexpression. | |
5e69f11e | 1374 | |
fa9a63c5 | 1375 | Also assumes the variables `fail_stack' and (if debugging), `bufp', |
25fe55af | 1376 | `pend', `string1', `size1', `string2', and `size2'. */ |
fa9a63c5 RM |
1377 | |
1378 | #define POP_FAILURE_POINT(str, pat, low_reg, high_reg, regstart, regend, reg_info)\ | |
1379 | { \ | |
1380 | DEBUG_STATEMENT (fail_stack_elt_t failure_id;) \ | |
1381 | int this_reg; \ | |
1382 | const unsigned char *string_temp; \ | |
1383 | \ | |
1384 | assert (!FAIL_STACK_EMPTY ()); \ | |
1385 | \ | |
1386 | /* Remove failure points and point to how many regs pushed. */ \ | |
1387 | DEBUG_PRINT1 ("POP_FAILURE_POINT:\n"); \ | |
1388 | DEBUG_PRINT2 (" Before pop, next avail: %d\n", fail_stack.avail); \ | |
25fe55af | 1389 | DEBUG_PRINT2 (" size: %d\n", fail_stack.size); \ |
fa9a63c5 RM |
1390 | \ |
1391 | assert (fail_stack.avail >= NUM_NONREG_ITEMS); \ | |
1392 | \ | |
1393 | DEBUG_POP (&failure_id); \ | |
1394 | DEBUG_PRINT2 (" Popping failure id: %u\n", failure_id); \ | |
1395 | \ | |
1396 | /* If the saved string location is NULL, it came from an \ | |
1397 | on_failure_keep_string_jump opcode, and we want to throw away the \ | |
1398 | saved NULL, thus retaining our current position in the string. */ \ | |
1399 | string_temp = POP_FAILURE_POINTER (); \ | |
1400 | if (string_temp != NULL) \ | |
1401 | str = (const char *) string_temp; \ | |
1402 | \ | |
1403 | DEBUG_PRINT2 (" Popping string 0x%x: `", str); \ | |
1404 | DEBUG_PRINT_DOUBLE_STRING (str, string1, size1, string2, size2); \ | |
1405 | DEBUG_PRINT1 ("'\n"); \ | |
1406 | \ | |
1407 | pat = (unsigned char *) POP_FAILURE_POINTER (); \ | |
1408 | DEBUG_PRINT2 (" Popping pattern 0x%x: ", pat); \ | |
1409 | DEBUG_PRINT_COMPILED_PATTERN (bufp, pat, pend); \ | |
1410 | \ | |
1411 | /* Restore register info. */ \ | |
1412 | high_reg = (unsigned) POP_FAILURE_INT (); \ | |
1413 | DEBUG_PRINT2 (" Popping high active reg: %d\n", high_reg); \ | |
1414 | \ | |
1415 | low_reg = (unsigned) POP_FAILURE_INT (); \ | |
1416 | DEBUG_PRINT2 (" Popping low active reg: %d\n", low_reg); \ | |
1417 | \ | |
68d96f02 | 1418 | if (1) \ |
faec11db RS |
1419 | for (this_reg = high_reg; this_reg >= low_reg; this_reg--) \ |
1420 | { \ | |
25fe55af | 1421 | DEBUG_PRINT2 (" Popping reg: %d\n", this_reg); \ |
fa9a63c5 | 1422 | \ |
faec11db | 1423 | reg_info[this_reg].word = POP_FAILURE_ELT (); \ |
25fe55af | 1424 | DEBUG_PRINT2 (" info: 0x%x\n", reg_info[this_reg]); \ |
fa9a63c5 | 1425 | \ |
faec11db | 1426 | regend[this_reg] = (const char *) POP_FAILURE_POINTER (); \ |
25fe55af | 1427 | DEBUG_PRINT2 (" end: 0x%x\n", regend[this_reg]); \ |
fa9a63c5 | 1428 | \ |
faec11db | 1429 | regstart[this_reg] = (const char *) POP_FAILURE_POINTER (); \ |
25fe55af | 1430 | DEBUG_PRINT2 (" start: 0x%x\n", regstart[this_reg]); \ |
faec11db | 1431 | } \ |
6676cb1c RS |
1432 | else \ |
1433 | { \ | |
1434 | for (this_reg = highest_active_reg; this_reg > high_reg; this_reg--) \ | |
1435 | { \ | |
4fcecab1 | 1436 | reg_info[this_reg].word.integer = 0; \ |
6676cb1c RS |
1437 | regend[this_reg] = 0; \ |
1438 | regstart[this_reg] = 0; \ | |
1439 | } \ | |
1440 | highest_active_reg = high_reg; \ | |
1441 | } \ | |
fa9a63c5 RM |
1442 | \ |
1443 | set_regs_matched_done = 0; \ | |
1444 | DEBUG_STATEMENT (nfailure_points_popped++); \ | |
1445 | } /* POP_FAILURE_POINT */ | |
1446 | ||
1447 | ||
1448 | \f | |
1449 | /* Structure for per-register (a.k.a. per-group) information. | |
1450 | Other register information, such as the | |
1451 | starting and ending positions (which are addresses), and the list of | |
1452 | inner groups (which is a bits list) are maintained in separate | |
5e69f11e RM |
1453 | variables. |
1454 | ||
fa9a63c5 RM |
1455 | We are making a (strictly speaking) nonportable assumption here: that |
1456 | the compiler will pack our bit fields into something that fits into | |
1457 | the type of `word', i.e., is something that fits into one item on the | |
1458 | failure stack. */ | |
1459 | ||
1460 | typedef union | |
1461 | { | |
1462 | fail_stack_elt_t word; | |
1463 | struct | |
1464 | { | |
1465 | /* This field is one if this group can match the empty string, | |
25fe55af | 1466 | zero if not. If not yet determined, `MATCH_NULL_UNSET_VALUE'. */ |
fa9a63c5 RM |
1467 | #define MATCH_NULL_UNSET_VALUE 3 |
1468 | unsigned match_null_string_p : 2; | |
1469 | unsigned is_active : 1; | |
1470 | unsigned matched_something : 1; | |
1471 | unsigned ever_matched_something : 1; | |
1472 | } bits; | |
1473 | } register_info_type; | |
1474 | ||
1475 | #define REG_MATCH_NULL_STRING_P(R) ((R).bits.match_null_string_p) | |
1476 | #define IS_ACTIVE(R) ((R).bits.is_active) | |
1477 | #define MATCHED_SOMETHING(R) ((R).bits.matched_something) | |
1478 | #define EVER_MATCHED_SOMETHING(R) ((R).bits.ever_matched_something) | |
1479 | ||
1480 | ||
1481 | /* Call this when have matched a real character; it sets `matched' flags | |
1482 | for the subexpressions which we are currently inside. Also records | |
1483 | that those subexprs have matched. */ | |
1484 | #define SET_REGS_MATCHED() \ | |
1485 | do \ | |
1486 | { \ | |
1487 | if (!set_regs_matched_done) \ | |
1488 | { \ | |
1489 | unsigned r; \ | |
1490 | set_regs_matched_done = 1; \ | |
1491 | for (r = lowest_active_reg; r <= highest_active_reg; r++) \ | |
1492 | { \ | |
1493 | MATCHED_SOMETHING (reg_info[r]) \ | |
1494 | = EVER_MATCHED_SOMETHING (reg_info[r]) \ | |
1495 | = 1; \ | |
1496 | } \ | |
1497 | } \ | |
1498 | } \ | |
1499 | while (0) | |
1500 | ||
1501 | /* Registers are set to a sentinel when they haven't yet matched. */ | |
1502 | static char reg_unset_dummy; | |
1503 | #define REG_UNSET_VALUE (®_unset_dummy) | |
1504 | #define REG_UNSET(e) ((e) == REG_UNSET_VALUE) | |
1505 | \f | |
1506 | /* Subroutine declarations and macros for regex_compile. */ | |
1507 | ||
1508 | static void store_op1 (), store_op2 (); | |
1509 | static void insert_op1 (), insert_op2 (); | |
1510 | static boolean at_begline_loc_p (), at_endline_loc_p (); | |
1511 | static boolean group_in_compile_stack (); | |
1512 | static reg_errcode_t compile_range (); | |
1513 | ||
5e69f11e | 1514 | /* Fetch the next character in the uncompiled pattern---translating it |
fa9a63c5 RM |
1515 | if necessary. Also cast from a signed character in the constant |
1516 | string passed to us by the user to an unsigned char that we can use | |
1517 | as an array index (in, e.g., `translate'). */ | |
6676cb1c | 1518 | #ifndef PATFETCH |
fa9a63c5 RM |
1519 | #define PATFETCH(c) \ |
1520 | do {if (p == pend) return REG_EEND; \ | |
1521 | c = (unsigned char) *p++; \ | |
6676cb1c | 1522 | if (translate) c = (unsigned char) translate[c]; \ |
fa9a63c5 | 1523 | } while (0) |
6676cb1c | 1524 | #endif |
fa9a63c5 RM |
1525 | |
1526 | /* Fetch the next character in the uncompiled pattern, with no | |
25fe55af | 1527 | translation. */ |
fa9a63c5 RM |
1528 | #define PATFETCH_RAW(c) \ |
1529 | do {if (p == pend) return REG_EEND; \ | |
25fe55af | 1530 | c = (unsigned char) *p++; \ |
fa9a63c5 RM |
1531 | } while (0) |
1532 | ||
1533 | /* Go backwards one character in the pattern. */ | |
1534 | #define PATUNFETCH p-- | |
1535 | ||
1536 | ||
1537 | /* If `translate' is non-null, return translate[D], else just D. We | |
1538 | cast the subscript to translate because some data is declared as | |
1539 | `char *', to avoid warnings when a string constant is passed. But | |
1540 | when we use a character as a subscript we must make it unsigned. */ | |
6676cb1c RS |
1541 | #ifndef TRANSLATE |
1542 | #define TRANSLATE(d) \ | |
bc192b5b | 1543 | (translate ? (unsigned char) RE_TRANSLATE (translate, (unsigned char) (d)) : (d)) |
6676cb1c | 1544 | #endif |
fa9a63c5 RM |
1545 | |
1546 | ||
1547 | /* Macros for outputting the compiled pattern into `buffer'. */ | |
1548 | ||
1549 | /* If the buffer isn't allocated when it comes in, use this. */ | |
1550 | #define INIT_BUF_SIZE 32 | |
1551 | ||
25fe55af | 1552 | /* Make sure we have at least N more bytes of space in buffer. */ |
fa9a63c5 RM |
1553 | #define GET_BUFFER_SPACE(n) \ |
1554 | while (b - bufp->buffer + (n) > bufp->allocated) \ | |
1555 | EXTEND_BUFFER () | |
1556 | ||
1557 | /* Make sure we have one more byte of buffer space and then add C to it. */ | |
1558 | #define BUF_PUSH(c) \ | |
1559 | do { \ | |
1560 | GET_BUFFER_SPACE (1); \ | |
1561 | *b++ = (unsigned char) (c); \ | |
1562 | } while (0) | |
1563 | ||
1564 | ||
1565 | /* Ensure we have two more bytes of buffer space and then append C1 and C2. */ | |
1566 | #define BUF_PUSH_2(c1, c2) \ | |
1567 | do { \ | |
1568 | GET_BUFFER_SPACE (2); \ | |
1569 | *b++ = (unsigned char) (c1); \ | |
1570 | *b++ = (unsigned char) (c2); \ | |
1571 | } while (0) | |
1572 | ||
1573 | ||
25fe55af | 1574 | /* As with BUF_PUSH_2, except for three bytes. */ |
fa9a63c5 RM |
1575 | #define BUF_PUSH_3(c1, c2, c3) \ |
1576 | do { \ | |
1577 | GET_BUFFER_SPACE (3); \ | |
1578 | *b++ = (unsigned char) (c1); \ | |
1579 | *b++ = (unsigned char) (c2); \ | |
1580 | *b++ = (unsigned char) (c3); \ | |
1581 | } while (0) | |
1582 | ||
1583 | ||
1584 | /* Store a jump with opcode OP at LOC to location TO. We store a | |
25fe55af | 1585 | relative address offset by the three bytes the jump itself occupies. */ |
fa9a63c5 RM |
1586 | #define STORE_JUMP(op, loc, to) \ |
1587 | store_op1 (op, loc, (to) - (loc) - 3) | |
1588 | ||
1589 | /* Likewise, for a two-argument jump. */ | |
1590 | #define STORE_JUMP2(op, loc, to, arg) \ | |
1591 | store_op2 (op, loc, (to) - (loc) - 3, arg) | |
1592 | ||
25fe55af | 1593 | /* Like `STORE_JUMP', but for inserting. Assume `b' is the buffer end. */ |
fa9a63c5 RM |
1594 | #define INSERT_JUMP(op, loc, to) \ |
1595 | insert_op1 (op, loc, (to) - (loc) - 3, b) | |
1596 | ||
1597 | /* Like `STORE_JUMP2', but for inserting. Assume `b' is the buffer end. */ | |
1598 | #define INSERT_JUMP2(op, loc, to, arg) \ | |
1599 | insert_op2 (op, loc, (to) - (loc) - 3, arg, b) | |
1600 | ||
1601 | ||
1602 | /* This is not an arbitrary limit: the arguments which represent offsets | |
25fe55af | 1603 | into the pattern are two bytes long. So if 2^16 bytes turns out to |
fa9a63c5 RM |
1604 | be too small, many things would have to change. */ |
1605 | #define MAX_BUF_SIZE (1L << 16) | |
1606 | ||
1607 | ||
1608 | /* Extend the buffer by twice its current size via realloc and | |
1609 | reset the pointers that pointed into the old block to point to the | |
1610 | correct places in the new one. If extending the buffer results in it | |
25fe55af | 1611 | being larger than MAX_BUF_SIZE, then flag memory exhausted. */ |
fa9a63c5 | 1612 | #define EXTEND_BUFFER() \ |
25fe55af | 1613 | do { \ |
fa9a63c5 | 1614 | unsigned char *old_buffer = bufp->buffer; \ |
25fe55af | 1615 | if (bufp->allocated == MAX_BUF_SIZE) \ |
fa9a63c5 RM |
1616 | return REG_ESIZE; \ |
1617 | bufp->allocated <<= 1; \ | |
1618 | if (bufp->allocated > MAX_BUF_SIZE) \ | |
25fe55af | 1619 | bufp->allocated = MAX_BUF_SIZE; \ |
fa9a63c5 RM |
1620 | bufp->buffer = (unsigned char *) realloc (bufp->buffer, bufp->allocated);\ |
1621 | if (bufp->buffer == NULL) \ | |
1622 | return REG_ESPACE; \ | |
1623 | /* If the buffer moved, move all the pointers into it. */ \ | |
1624 | if (old_buffer != bufp->buffer) \ | |
1625 | { \ | |
25fe55af RS |
1626 | b = (b - old_buffer) + bufp->buffer; \ |
1627 | begalt = (begalt - old_buffer) + bufp->buffer; \ | |
1628 | if (fixup_alt_jump) \ | |
1629 | fixup_alt_jump = (fixup_alt_jump - old_buffer) + bufp->buffer;\ | |
1630 | if (laststart) \ | |
1631 | laststart = (laststart - old_buffer) + bufp->buffer; \ | |
1632 | if (pending_exact) \ | |
1633 | pending_exact = (pending_exact - old_buffer) + bufp->buffer; \ | |
fa9a63c5 RM |
1634 | } \ |
1635 | } while (0) | |
1636 | ||
1637 | ||
1638 | /* Since we have one byte reserved for the register number argument to | |
1639 | {start,stop}_memory, the maximum number of groups we can report | |
1640 | things about is what fits in that byte. */ | |
1641 | #define MAX_REGNUM 255 | |
1642 | ||
1643 | /* But patterns can have more than `MAX_REGNUM' registers. We just | |
1644 | ignore the excess. */ | |
1645 | typedef unsigned regnum_t; | |
1646 | ||
1647 | ||
1648 | /* Macros for the compile stack. */ | |
1649 | ||
1650 | /* Since offsets can go either forwards or backwards, this type needs to | |
25fe55af | 1651 | be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1. */ |
fa9a63c5 RM |
1652 | typedef int pattern_offset_t; |
1653 | ||
1654 | typedef struct | |
1655 | { | |
1656 | pattern_offset_t begalt_offset; | |
1657 | pattern_offset_t fixup_alt_jump; | |
1658 | pattern_offset_t inner_group_offset; | |
5e69f11e | 1659 | pattern_offset_t laststart_offset; |
fa9a63c5 RM |
1660 | regnum_t regnum; |
1661 | } compile_stack_elt_t; | |
1662 | ||
1663 | ||
1664 | typedef struct | |
1665 | { | |
1666 | compile_stack_elt_t *stack; | |
1667 | unsigned size; | |
1668 | unsigned avail; /* Offset of next open position. */ | |
1669 | } compile_stack_type; | |
1670 | ||
1671 | ||
1672 | #define INIT_COMPILE_STACK_SIZE 32 | |
1673 | ||
1674 | #define COMPILE_STACK_EMPTY (compile_stack.avail == 0) | |
1675 | #define COMPILE_STACK_FULL (compile_stack.avail == compile_stack.size) | |
1676 | ||
25fe55af | 1677 | /* The next available element. */ |
fa9a63c5 RM |
1678 | #define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail]) |
1679 | ||
1680 | ||
b18215fc RS |
1681 | /* Structure to manage work area for range table. */ |
1682 | struct range_table_work_area | |
1683 | { | |
1684 | int *table; /* actual work area. */ | |
1685 | int allocated; /* allocated size for work area in bytes. */ | |
25fe55af | 1686 | int used; /* actually used size in words. */ |
b18215fc RS |
1687 | }; |
1688 | ||
1689 | /* Make sure that WORK_AREA can hold more N multibyte characters. */ | |
1690 | #define EXTEND_RANGE_TABLE_WORK_AREA(work_area, n) \ | |
1691 | do { \ | |
1692 | if (((work_area).used + (n)) * sizeof (int) > (work_area).allocated) \ | |
1693 | { \ | |
1694 | (work_area).allocated += 16 * sizeof (int); \ | |
1695 | if ((work_area).table) \ | |
1696 | (work_area).table \ | |
1697 | = (int *) realloc ((work_area).table, (work_area).allocated); \ | |
1698 | else \ | |
1699 | (work_area).table \ | |
1700 | = (int *) malloc ((work_area).allocated); \ | |
1701 | if ((work_area).table == 0) \ | |
1702 | FREE_STACK_RETURN (REG_ESPACE); \ | |
1703 | } \ | |
1704 | } while (0) | |
1705 | ||
1706 | /* Set a range (RANGE_START, RANGE_END) to WORK_AREA. */ | |
1707 | #define SET_RANGE_TABLE_WORK_AREA(work_area, range_start, range_end) \ | |
1708 | do { \ | |
1709 | EXTEND_RANGE_TABLE_WORK_AREA ((work_area), 2); \ | |
1710 | (work_area).table[(work_area).used++] = (range_start); \ | |
1711 | (work_area).table[(work_area).used++] = (range_end); \ | |
1712 | } while (0) | |
1713 | ||
25fe55af | 1714 | /* Free allocated memory for WORK_AREA. */ |
b18215fc RS |
1715 | #define FREE_RANGE_TABLE_WORK_AREA(work_area) \ |
1716 | do { \ | |
1717 | if ((work_area).table) \ | |
1718 | free ((work_area).table); \ | |
1719 | } while (0) | |
1720 | ||
1721 | #define CLEAR_RANGE_TABLE_WORK_USED(work_area) ((work_area).used = 0) | |
1722 | #define RANGE_TABLE_WORK_USED(work_area) ((work_area).used) | |
1723 | #define RANGE_TABLE_WORK_ELT(work_area, i) ((work_area).table[i]) | |
1724 | ||
1725 | ||
fa9a63c5 | 1726 | /* Set the bit for character C in a list. */ |
25fe55af RS |
1727 | #define SET_LIST_BIT(c) \ |
1728 | (b[((unsigned char) (c)) / BYTEWIDTH] \ | |
fa9a63c5 RM |
1729 | |= 1 << (((unsigned char) c) % BYTEWIDTH)) |
1730 | ||
1731 | ||
1732 | /* Get the next unsigned number in the uncompiled pattern. */ | |
25fe55af | 1733 | #define GET_UNSIGNED_NUMBER(num) \ |
fa9a63c5 RM |
1734 | { if (p != pend) \ |
1735 | { \ | |
25fe55af RS |
1736 | PATFETCH (c); \ |
1737 | while (ISDIGIT (c)) \ | |
1738 | { \ | |
1739 | if (num < 0) \ | |
1740 | num = 0; \ | |
1741 | num = num * 10 + c - '0'; \ | |
1742 | if (p == pend) \ | |
1743 | break; \ | |
1744 | PATFETCH (c); \ | |
1745 | } \ | |
1746 | } \ | |
5e69f11e | 1747 | } |
fa9a63c5 RM |
1748 | |
1749 | #define CHAR_CLASS_MAX_LENGTH 6 /* Namely, `xdigit'. */ | |
1750 | ||
1751 | #define IS_CHAR_CLASS(string) \ | |
1752 | (STREQ (string, "alpha") || STREQ (string, "upper") \ | |
1753 | || STREQ (string, "lower") || STREQ (string, "digit") \ | |
1754 | || STREQ (string, "alnum") || STREQ (string, "xdigit") \ | |
1755 | || STREQ (string, "space") || STREQ (string, "print") \ | |
1756 | || STREQ (string, "punct") || STREQ (string, "graph") \ | |
1757 | || STREQ (string, "cntrl") || STREQ (string, "blank")) | |
1758 | \f | |
1759 | #ifndef MATCH_MAY_ALLOCATE | |
1760 | ||
1761 | /* If we cannot allocate large objects within re_match_2_internal, | |
1762 | we make the fail stack and register vectors global. | |
1763 | The fail stack, we grow to the maximum size when a regexp | |
1764 | is compiled. | |
1765 | The register vectors, we adjust in size each time we | |
1766 | compile a regexp, according to the number of registers it needs. */ | |
1767 | ||
1768 | static fail_stack_type fail_stack; | |
1769 | ||
1770 | /* Size with which the following vectors are currently allocated. | |
1771 | That is so we can make them bigger as needed, | |
25fe55af | 1772 | but never make them smaller. */ |
fa9a63c5 RM |
1773 | static int regs_allocated_size; |
1774 | ||
25fe55af | 1775 | static const char ** regstart, ** regend; |
fa9a63c5 RM |
1776 | static const char ** old_regstart, ** old_regend; |
1777 | static const char **best_regstart, **best_regend; | |
5e69f11e | 1778 | static register_info_type *reg_info; |
fa9a63c5 RM |
1779 | static const char **reg_dummy; |
1780 | static register_info_type *reg_info_dummy; | |
1781 | ||
1782 | /* Make the register vectors big enough for NUM_REGS registers, | |
25fe55af | 1783 | but don't make them smaller. */ |
fa9a63c5 RM |
1784 | |
1785 | static | |
1786 | regex_grow_registers (num_regs) | |
1787 | int num_regs; | |
1788 | { | |
1789 | if (num_regs > regs_allocated_size) | |
1790 | { | |
1791 | RETALLOC_IF (regstart, num_regs, const char *); | |
1792 | RETALLOC_IF (regend, num_regs, const char *); | |
1793 | RETALLOC_IF (old_regstart, num_regs, const char *); | |
1794 | RETALLOC_IF (old_regend, num_regs, const char *); | |
1795 | RETALLOC_IF (best_regstart, num_regs, const char *); | |
1796 | RETALLOC_IF (best_regend, num_regs, const char *); | |
1797 | RETALLOC_IF (reg_info, num_regs, register_info_type); | |
1798 | RETALLOC_IF (reg_dummy, num_regs, const char *); | |
1799 | RETALLOC_IF (reg_info_dummy, num_regs, register_info_type); | |
1800 | ||
1801 | regs_allocated_size = num_regs; | |
1802 | } | |
1803 | } | |
1804 | ||
1805 | #endif /* not MATCH_MAY_ALLOCATE */ | |
1806 | \f | |
1807 | /* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX. | |
1808 | Returns one of error codes defined in `regex.h', or zero for success. | |
1809 | ||
1810 | Assumes the `allocated' (and perhaps `buffer') and `translate' | |
1811 | fields are set in BUFP on entry. | |
1812 | ||
1813 | If it succeeds, results are put in BUFP (if it returns an error, the | |
1814 | contents of BUFP are undefined): | |
1815 | `buffer' is the compiled pattern; | |
1816 | `syntax' is set to SYNTAX; | |
1817 | `used' is set to the length of the compiled pattern; | |
1818 | `fastmap_accurate' is zero; | |
1819 | `re_nsub' is the number of subexpressions in PATTERN; | |
1820 | `not_bol' and `not_eol' are zero; | |
5e69f11e | 1821 | |
fa9a63c5 RM |
1822 | The `fastmap' and `newline_anchor' fields are neither |
1823 | examined nor set. */ | |
1824 | ||
1825 | /* Return, freeing storage we allocated. */ | |
1826 | #define FREE_STACK_RETURN(value) \ | |
b18215fc RS |
1827 | do { \ |
1828 | FREE_RANGE_TABLE_WORK_AREA (range_table_work); \ | |
1829 | free (compile_stack.stack); \ | |
1830 | return value; \ | |
1831 | } while (0) | |
fa9a63c5 RM |
1832 | |
1833 | static reg_errcode_t | |
1834 | regex_compile (pattern, size, syntax, bufp) | |
1835 | const char *pattern; | |
1836 | int size; | |
1837 | reg_syntax_t syntax; | |
1838 | struct re_pattern_buffer *bufp; | |
1839 | { | |
1840 | /* We fetch characters from PATTERN here. Even though PATTERN is | |
1841 | `char *' (i.e., signed), we declare these variables as unsigned, so | |
1842 | they can be reliably used as array indices. */ | |
b18215fc | 1843 | register unsigned int c, c1; |
5e69f11e | 1844 | |
fa9a63c5 RM |
1845 | /* A random temporary spot in PATTERN. */ |
1846 | const char *p1; | |
1847 | ||
1848 | /* Points to the end of the buffer, where we should append. */ | |
1849 | register unsigned char *b; | |
5e69f11e | 1850 | |
fa9a63c5 RM |
1851 | /* Keeps track of unclosed groups. */ |
1852 | compile_stack_type compile_stack; | |
1853 | ||
1854 | /* Points to the current (ending) position in the pattern. */ | |
1855 | const char *p = pattern; | |
1856 | const char *pend = pattern + size; | |
5e69f11e | 1857 | |
fa9a63c5 | 1858 | /* How to translate the characters in the pattern. */ |
6676cb1c | 1859 | RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 RM |
1860 | |
1861 | /* Address of the count-byte of the most recently inserted `exactn' | |
1862 | command. This makes it possible to tell if a new exact-match | |
1863 | character can be added to that command or if the character requires | |
1864 | a new `exactn' command. */ | |
1865 | unsigned char *pending_exact = 0; | |
1866 | ||
1867 | /* Address of start of the most recently finished expression. | |
1868 | This tells, e.g., postfix * where to find the start of its | |
1869 | operand. Reset at the beginning of groups and alternatives. */ | |
1870 | unsigned char *laststart = 0; | |
1871 | ||
1872 | /* Address of beginning of regexp, or inside of last group. */ | |
1873 | unsigned char *begalt; | |
1874 | ||
1875 | /* Place in the uncompiled pattern (i.e., the {) to | |
1876 | which to go back if the interval is invalid. */ | |
1877 | const char *beg_interval; | |
5e69f11e | 1878 | |
fa9a63c5 | 1879 | /* Address of the place where a forward jump should go to the end of |
25fe55af | 1880 | the containing expression. Each alternative of an `or' -- except the |
fa9a63c5 RM |
1881 | last -- ends with a forward jump of this sort. */ |
1882 | unsigned char *fixup_alt_jump = 0; | |
1883 | ||
1884 | /* Counts open-groups as they are encountered. Remembered for the | |
1885 | matching close-group on the compile stack, so the same register | |
1886 | number is put in the stop_memory as the start_memory. */ | |
1887 | regnum_t regnum = 0; | |
1888 | ||
b18215fc RS |
1889 | /* Work area for range table of charset. */ |
1890 | struct range_table_work_area range_table_work; | |
1891 | ||
fa9a63c5 RM |
1892 | #ifdef DEBUG |
1893 | DEBUG_PRINT1 ("\nCompiling pattern: "); | |
1894 | if (debug) | |
1895 | { | |
1896 | unsigned debug_count; | |
5e69f11e | 1897 | |
fa9a63c5 | 1898 | for (debug_count = 0; debug_count < size; debug_count++) |
25fe55af | 1899 | putchar (pattern[debug_count]); |
fa9a63c5 RM |
1900 | putchar ('\n'); |
1901 | } | |
1902 | #endif /* DEBUG */ | |
1903 | ||
1904 | /* Initialize the compile stack. */ | |
1905 | compile_stack.stack = TALLOC (INIT_COMPILE_STACK_SIZE, compile_stack_elt_t); | |
1906 | if (compile_stack.stack == NULL) | |
1907 | return REG_ESPACE; | |
1908 | ||
1909 | compile_stack.size = INIT_COMPILE_STACK_SIZE; | |
1910 | compile_stack.avail = 0; | |
1911 | ||
b18215fc RS |
1912 | range_table_work.table = 0; |
1913 | range_table_work.allocated = 0; | |
1914 | ||
fa9a63c5 RM |
1915 | /* Initialize the pattern buffer. */ |
1916 | bufp->syntax = syntax; | |
1917 | bufp->fastmap_accurate = 0; | |
1918 | bufp->not_bol = bufp->not_eol = 0; | |
1919 | ||
1920 | /* Set `used' to zero, so that if we return an error, the pattern | |
1921 | printer (for debugging) will think there's no pattern. We reset it | |
1922 | at the end. */ | |
1923 | bufp->used = 0; | |
5e69f11e | 1924 | |
fa9a63c5 | 1925 | /* Always count groups, whether or not bufp->no_sub is set. */ |
5e69f11e | 1926 | bufp->re_nsub = 0; |
fa9a63c5 | 1927 | |
b18215fc RS |
1928 | #ifdef emacs |
1929 | /* bufp->multibyte is set before regex_compile is called, so don't alter | |
1930 | it. */ | |
1931 | #else /* not emacs */ | |
1932 | /* Nothing is recognized as a multibyte character. */ | |
1933 | bufp->multibyte = 0; | |
1934 | #endif | |
1935 | ||
fa9a63c5 RM |
1936 | #if !defined (emacs) && !defined (SYNTAX_TABLE) |
1937 | /* Initialize the syntax table. */ | |
1938 | init_syntax_once (); | |
1939 | #endif | |
1940 | ||
1941 | if (bufp->allocated == 0) | |
1942 | { | |
1943 | if (bufp->buffer) | |
1944 | { /* If zero allocated, but buffer is non-null, try to realloc | |
25fe55af RS |
1945 | enough space. This loses if buffer's address is bogus, but |
1946 | that is the user's responsibility. */ | |
1947 | RETALLOC (bufp->buffer, INIT_BUF_SIZE, unsigned char); | |
1948 | } | |
fa9a63c5 | 1949 | else |
25fe55af RS |
1950 | { /* Caller did not allocate a buffer. Do it for them. */ |
1951 | bufp->buffer = TALLOC (INIT_BUF_SIZE, unsigned char); | |
1952 | } | |
fa9a63c5 RM |
1953 | if (!bufp->buffer) FREE_STACK_RETURN (REG_ESPACE); |
1954 | ||
1955 | bufp->allocated = INIT_BUF_SIZE; | |
1956 | } | |
1957 | ||
1958 | begalt = b = bufp->buffer; | |
1959 | ||
1960 | /* Loop through the uncompiled pattern until we're at the end. */ | |
1961 | while (p != pend) | |
1962 | { | |
1963 | PATFETCH (c); | |
1964 | ||
1965 | switch (c) | |
25fe55af RS |
1966 | { |
1967 | case '^': | |
1968 | { | |
1969 | if ( /* If at start of pattern, it's an operator. */ | |
1970 | p == pattern + 1 | |
1971 | /* If context independent, it's an operator. */ | |
1972 | || syntax & RE_CONTEXT_INDEP_ANCHORS | |
1973 | /* Otherwise, depends on what's come before. */ | |
1974 | || at_begline_loc_p (pattern, p, syntax)) | |
1975 | BUF_PUSH (begline); | |
1976 | else | |
1977 | goto normal_char; | |
1978 | } | |
1979 | break; | |
1980 | ||
1981 | ||
1982 | case '$': | |
1983 | { | |
1984 | if ( /* If at end of pattern, it's an operator. */ | |
1985 | p == pend | |
1986 | /* If context independent, it's an operator. */ | |
1987 | || syntax & RE_CONTEXT_INDEP_ANCHORS | |
1988 | /* Otherwise, depends on what's next. */ | |
1989 | || at_endline_loc_p (p, pend, syntax)) | |
1990 | BUF_PUSH (endline); | |
1991 | else | |
1992 | goto normal_char; | |
1993 | } | |
1994 | break; | |
fa9a63c5 RM |
1995 | |
1996 | ||
1997 | case '+': | |
25fe55af RS |
1998 | case '?': |
1999 | if ((syntax & RE_BK_PLUS_QM) | |
2000 | || (syntax & RE_LIMITED_OPS)) | |
2001 | goto normal_char; | |
2002 | handle_plus: | |
2003 | case '*': | |
2004 | /* If there is no previous pattern... */ | |
2005 | if (!laststart) | |
2006 | { | |
2007 | if (syntax & RE_CONTEXT_INVALID_OPS) | |
2008 | FREE_STACK_RETURN (REG_BADRPT); | |
2009 | else if (!(syntax & RE_CONTEXT_INDEP_OPS)) | |
2010 | goto normal_char; | |
2011 | } | |
2012 | ||
2013 | { | |
2014 | /* Are we optimizing this jump? */ | |
2015 | boolean keep_string_p = false; | |
2016 | ||
2017 | /* 1 means zero (many) matches is allowed. */ | |
2018 | char zero_times_ok = 0, many_times_ok = 0; | |
2019 | ||
2020 | /* If there is a sequence of repetition chars, collapse it | |
2021 | down to just one (the right one). We can't combine | |
2022 | interval operators with these because of, e.g., `a{2}*', | |
2023 | which should only match an even number of `a's. */ | |
2024 | ||
2025 | for (;;) | |
2026 | { | |
2027 | zero_times_ok |= c != '+'; | |
2028 | many_times_ok |= c != '?'; | |
2029 | ||
2030 | if (p == pend) | |
2031 | break; | |
2032 | ||
2033 | PATFETCH (c); | |
2034 | ||
2035 | if (c == '*' | |
2036 | || (!(syntax & RE_BK_PLUS_QM) && (c == '+' || c == '?'))) | |
2037 | ; | |
2038 | ||
2039 | else if (syntax & RE_BK_PLUS_QM && c == '\\') | |
2040 | { | |
2041 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
2042 | ||
2043 | PATFETCH (c1); | |
2044 | if (!(c1 == '+' || c1 == '?')) | |
2045 | { | |
2046 | PATUNFETCH; | |
2047 | PATUNFETCH; | |
2048 | break; | |
2049 | } | |
2050 | ||
2051 | c = c1; | |
2052 | } | |
2053 | else | |
2054 | { | |
2055 | PATUNFETCH; | |
2056 | break; | |
2057 | } | |
2058 | ||
2059 | /* If we get here, we found another repeat character. */ | |
2060 | } | |
2061 | ||
2062 | /* Star, etc. applied to an empty pattern is equivalent | |
2063 | to an empty pattern. */ | |
2064 | if (!laststart) | |
2065 | break; | |
2066 | ||
2067 | /* Now we know whether or not zero matches is allowed | |
2068 | and also whether or not two or more matches is allowed. */ | |
2069 | if (many_times_ok) | |
2070 | { /* More than one repetition is allowed, so put in at the | |
2071 | end a backward relative jump from `b' to before the next | |
2072 | jump we're going to put in below (which jumps from | |
2073 | laststart to after this jump). | |
2074 | ||
2075 | But if we are at the `*' in the exact sequence `.*\n', | |
2076 | insert an unconditional jump backwards to the ., | |
2077 | instead of the beginning of the loop. This way we only | |
2078 | push a failure point once, instead of every time | |
2079 | through the loop. */ | |
2080 | assert (p - 1 > pattern); | |
2081 | ||
2082 | /* Allocate the space for the jump. */ | |
2083 | GET_BUFFER_SPACE (3); | |
2084 | ||
2085 | /* We know we are not at the first character of the pattern, | |
2086 | because laststart was nonzero. And we've already | |
2087 | incremented `p', by the way, to be the character after | |
2088 | the `*'. Do we have to do something analogous here | |
2089 | for null bytes, because of RE_DOT_NOT_NULL? */ | |
2090 | if (TRANSLATE (*(p - 2)) == TRANSLATE ('.') | |
fa9a63c5 | 2091 | && zero_times_ok |
25fe55af RS |
2092 | && p < pend && TRANSLATE (*p) == TRANSLATE ('\n') |
2093 | && !(syntax & RE_DOT_NEWLINE)) | |
2094 | { /* We have .*\n. */ | |
2095 | STORE_JUMP (jump, b, laststart); | |
2096 | keep_string_p = true; | |
2097 | } | |
2098 | else | |
2099 | /* Anything else. */ | |
2100 | STORE_JUMP (maybe_pop_jump, b, laststart - 3); | |
2101 | ||
2102 | /* We've added more stuff to the buffer. */ | |
2103 | b += 3; | |
2104 | } | |
2105 | ||
2106 | /* On failure, jump from laststart to b + 3, which will be the | |
2107 | end of the buffer after this jump is inserted. */ | |
2108 | GET_BUFFER_SPACE (3); | |
2109 | INSERT_JUMP (keep_string_p ? on_failure_keep_string_jump | |
2110 | : on_failure_jump, | |
2111 | laststart, b + 3); | |
2112 | pending_exact = 0; | |
2113 | b += 3; | |
2114 | ||
2115 | if (!zero_times_ok) | |
2116 | { | |
2117 | /* At least one repetition is required, so insert a | |
2118 | `dummy_failure_jump' before the initial | |
2119 | `on_failure_jump' instruction of the loop. This | |
2120 | effects a skip over that instruction the first time | |
2121 | we hit that loop. */ | |
2122 | GET_BUFFER_SPACE (3); | |
2123 | INSERT_JUMP (dummy_failure_jump, laststart, laststart + 6); | |
2124 | b += 3; | |
2125 | } | |
2126 | } | |
fa9a63c5 RM |
2127 | break; |
2128 | ||
2129 | ||
2130 | case '.': | |
25fe55af RS |
2131 | laststart = b; |
2132 | BUF_PUSH (anychar); | |
2133 | break; | |
fa9a63c5 RM |
2134 | |
2135 | ||
25fe55af RS |
2136 | case '[': |
2137 | { | |
b18215fc | 2138 | CLEAR_RANGE_TABLE_WORK_USED (range_table_work); |
fa9a63c5 | 2139 | |
25fe55af | 2140 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
fa9a63c5 | 2141 | |
25fe55af RS |
2142 | /* Ensure that we have enough space to push a charset: the |
2143 | opcode, the length count, and the bitset; 34 bytes in all. */ | |
fa9a63c5 RM |
2144 | GET_BUFFER_SPACE (34); |
2145 | ||
25fe55af | 2146 | laststart = b; |
e318085a | 2147 | |
25fe55af RS |
2148 | /* We test `*p == '^' twice, instead of using an if |
2149 | statement, so we only need one BUF_PUSH. */ | |
2150 | BUF_PUSH (*p == '^' ? charset_not : charset); | |
2151 | if (*p == '^') | |
2152 | p++; | |
e318085a | 2153 | |
25fe55af RS |
2154 | /* Remember the first position in the bracket expression. */ |
2155 | p1 = p; | |
e318085a | 2156 | |
25fe55af RS |
2157 | /* Push the number of bytes in the bitmap. */ |
2158 | BUF_PUSH ((1 << BYTEWIDTH) / BYTEWIDTH); | |
e318085a | 2159 | |
25fe55af RS |
2160 | /* Clear the whole map. */ |
2161 | bzero (b, (1 << BYTEWIDTH) / BYTEWIDTH); | |
e318085a | 2162 | |
25fe55af RS |
2163 | /* charset_not matches newline according to a syntax bit. */ |
2164 | if ((re_opcode_t) b[-2] == charset_not | |
2165 | && (syntax & RE_HAT_LISTS_NOT_NEWLINE)) | |
2166 | SET_LIST_BIT ('\n'); | |
fa9a63c5 | 2167 | |
25fe55af RS |
2168 | /* Read in characters and ranges, setting map bits. */ |
2169 | for (;;) | |
2170 | { | |
b18215fc RS |
2171 | int len; |
2172 | boolean escaped_char = false; | |
e318085a | 2173 | |
25fe55af | 2174 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
e318085a | 2175 | |
25fe55af | 2176 | PATFETCH (c); |
e318085a | 2177 | |
25fe55af RS |
2178 | /* \ might escape characters inside [...] and [^...]. */ |
2179 | if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\') | |
2180 | { | |
2181 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
e318085a RS |
2182 | |
2183 | PATFETCH (c); | |
b18215fc | 2184 | escaped_char = true; |
25fe55af | 2185 | } |
b18215fc RS |
2186 | else |
2187 | { | |
25fe55af RS |
2188 | /* Could be the end of the bracket expression. If it's |
2189 | not (i.e., when the bracket expression is `[]' so | |
2190 | far), the ']' character bit gets set way below. */ | |
2191 | if (c == ']' && p != p1 + 1) | |
2192 | break; | |
2193 | } | |
b18215fc RS |
2194 | |
2195 | /* If C indicates start of multibyte char, get the | |
2196 | actual character code in C, and set the pattern | |
2197 | pointer P to the next character boundary. */ | |
2198 | if (bufp->multibyte && BASE_LEADING_CODE_P (c)) | |
2199 | { | |
2200 | PATUNFETCH; | |
2201 | c = STRING_CHAR_AND_LENGTH (p, pend - p, len); | |
2202 | p += len; | |
25fe55af | 2203 | } |
b18215fc RS |
2204 | /* What should we do for the character which is |
2205 | greater than 0x7F, but not BASE_LEADING_CODE_P? | |
2206 | XXX */ | |
2207 | ||
25fe55af RS |
2208 | /* See if we're at the beginning of a possible character |
2209 | class. */ | |
b18215fc RS |
2210 | |
2211 | else if (!escaped_char && | |
2212 | syntax & RE_CHAR_CLASSES && c == '[' && *p == ':') | |
25fe55af RS |
2213 | { /* Leave room for the null. */ |
2214 | char str[CHAR_CLASS_MAX_LENGTH + 1]; | |
b18215fc | 2215 | |
25fe55af RS |
2216 | PATFETCH (c); |
2217 | c1 = 0; | |
b18215fc | 2218 | |
25fe55af RS |
2219 | /* If pattern is `[[:'. */ |
2220 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); | |
b18215fc | 2221 | |
25fe55af RS |
2222 | for (;;) |
2223 | { | |
2224 | PATFETCH (c); | |
2225 | if (c == ':' || c == ']' || p == pend | |
2226 | || c1 == CHAR_CLASS_MAX_LENGTH) | |
2227 | break; | |
2228 | str[c1++] = c; | |
2229 | } | |
2230 | str[c1] = '\0'; | |
b18215fc RS |
2231 | |
2232 | /* If isn't a word bracketed by `[:' and `:]': | |
2233 | undo the ending character, the letters, and | |
2234 | leave the leading `:' and `[' (but set bits for | |
2235 | them). */ | |
25fe55af RS |
2236 | if (c == ':' && *p == ']') |
2237 | { | |
2238 | int ch; | |
2239 | boolean is_alnum = STREQ (str, "alnum"); | |
2240 | boolean is_alpha = STREQ (str, "alpha"); | |
2241 | boolean is_blank = STREQ (str, "blank"); | |
2242 | boolean is_cntrl = STREQ (str, "cntrl"); | |
2243 | boolean is_digit = STREQ (str, "digit"); | |
2244 | boolean is_graph = STREQ (str, "graph"); | |
2245 | boolean is_lower = STREQ (str, "lower"); | |
2246 | boolean is_print = STREQ (str, "print"); | |
2247 | boolean is_punct = STREQ (str, "punct"); | |
2248 | boolean is_space = STREQ (str, "space"); | |
2249 | boolean is_upper = STREQ (str, "upper"); | |
2250 | boolean is_xdigit = STREQ (str, "xdigit"); | |
2251 | ||
2252 | if (!IS_CHAR_CLASS (str)) | |
fa9a63c5 RM |
2253 | FREE_STACK_RETURN (REG_ECTYPE); |
2254 | ||
25fe55af RS |
2255 | /* Throw away the ] at the end of the character |
2256 | class. */ | |
2257 | PATFETCH (c); | |
fa9a63c5 | 2258 | |
25fe55af | 2259 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
fa9a63c5 | 2260 | |
25fe55af RS |
2261 | for (ch = 0; ch < 1 << BYTEWIDTH; ch++) |
2262 | { | |
7ae68633 | 2263 | int translated = TRANSLATE (ch); |
fa9a63c5 RM |
2264 | /* This was split into 3 if's to |
2265 | avoid an arbitrary limit in some compiler. */ | |
25fe55af RS |
2266 | if ( (is_alnum && ISALNUM (ch)) |
2267 | || (is_alpha && ISALPHA (ch)) | |
2268 | || (is_blank && ISBLANK (ch)) | |
2269 | || (is_cntrl && ISCNTRL (ch))) | |
7ae68633 | 2270 | SET_LIST_BIT (translated); |
fa9a63c5 | 2271 | if ( (is_digit && ISDIGIT (ch)) |
25fe55af RS |
2272 | || (is_graph && ISGRAPH (ch)) |
2273 | || (is_lower && ISLOWER (ch)) | |
2274 | || (is_print && ISPRINT (ch))) | |
7ae68633 | 2275 | SET_LIST_BIT (translated); |
fa9a63c5 | 2276 | if ( (is_punct && ISPUNCT (ch)) |
25fe55af RS |
2277 | || (is_space && ISSPACE (ch)) |
2278 | || (is_upper && ISUPPER (ch)) | |
2279 | || (is_xdigit && ISXDIGIT (ch))) | |
7ae68633 | 2280 | SET_LIST_BIT (translated); |
25fe55af | 2281 | } |
b18215fc RS |
2282 | |
2283 | /* Repeat the loop. */ | |
2284 | continue; | |
25fe55af RS |
2285 | } |
2286 | else | |
2287 | { | |
2288 | c1++; | |
2289 | while (c1--) | |
2290 | PATUNFETCH; | |
2291 | SET_LIST_BIT ('['); | |
b18215fc RS |
2292 | |
2293 | /* Because the `:' may starts the range, we | |
2294 | can't simply set bit and repeat the loop. | |
25fe55af | 2295 | Instead, just set it to C and handle below. */ |
b18215fc | 2296 | c = ':'; |
25fe55af RS |
2297 | } |
2298 | } | |
b18215fc RS |
2299 | |
2300 | if (p < pend && p[0] == '-' && p[1] != ']') | |
2301 | { | |
2302 | ||
2303 | /* Discard the `-'. */ | |
2304 | PATFETCH (c1); | |
2305 | ||
2306 | /* Fetch the character which ends the range. */ | |
2307 | PATFETCH (c1); | |
2308 | if (bufp->multibyte && BASE_LEADING_CODE_P (c1)) | |
e318085a | 2309 | { |
b18215fc RS |
2310 | PATUNFETCH; |
2311 | c1 = STRING_CHAR_AND_LENGTH (p, pend - p, len); | |
2312 | p += len; | |
e318085a | 2313 | } |
b18215fc RS |
2314 | |
2315 | if (!SAME_CHARSET_P (c, c1)) | |
2316 | FREE_STACK_RETURN (REG_ERANGE); | |
e318085a | 2317 | } |
25fe55af | 2318 | else |
b18215fc RS |
2319 | /* Range from C to C. */ |
2320 | c1 = c; | |
2321 | ||
2322 | /* Set the range ... */ | |
2323 | if (SINGLE_BYTE_CHAR_P (c)) | |
2324 | /* ... into bitmap. */ | |
25fe55af | 2325 | { |
b18215fc RS |
2326 | unsigned this_char; |
2327 | int range_start = c, range_end = c1; | |
2328 | ||
2329 | /* If the start is after the end, the range is empty. */ | |
2330 | if (range_start > range_end) | |
2331 | { | |
2332 | if (syntax & RE_NO_EMPTY_RANGES) | |
2333 | FREE_STACK_RETURN (REG_ERANGE); | |
2334 | /* Else, repeat the loop. */ | |
2335 | } | |
2336 | else | |
2337 | { | |
2338 | for (this_char = range_start; this_char <= range_end; | |
2339 | this_char++) | |
2340 | SET_LIST_BIT (TRANSLATE (this_char)); | |
25fe55af RS |
2341 | } |
2342 | } | |
e318085a | 2343 | else |
b18215fc RS |
2344 | /* ... into range table. */ |
2345 | SET_RANGE_TABLE_WORK_AREA (range_table_work, c, c1); | |
e318085a RS |
2346 | } |
2347 | ||
25fe55af RS |
2348 | /* Discard any (non)matching list bytes that are all 0 at the |
2349 | end of the map. Decrease the map-length byte too. */ | |
2350 | while ((int) b[-1] > 0 && b[b[-1] - 1] == 0) | |
2351 | b[-1]--; | |
2352 | b += b[-1]; | |
fa9a63c5 | 2353 | |
b18215fc RS |
2354 | /* Build real range table from work area. */ |
2355 | if (RANGE_TABLE_WORK_USED (range_table_work)) | |
2356 | { | |
2357 | int i; | |
2358 | int used = RANGE_TABLE_WORK_USED (range_table_work); | |
fa9a63c5 | 2359 | |
b18215fc | 2360 | /* Allocate space for COUNT + RANGE_TABLE. Needs two |
25fe55af | 2361 | bytes for COUNT and three bytes for each character. */ |
b18215fc | 2362 | GET_BUFFER_SPACE (2 + used * 3); |
fa9a63c5 | 2363 | |
b18215fc RS |
2364 | /* Indicate the existence of range table. */ |
2365 | laststart[1] |= 0x80; | |
fa9a63c5 | 2366 | |
b18215fc RS |
2367 | STORE_NUMBER_AND_INCR (b, used / 2); |
2368 | for (i = 0; i < used; i++) | |
2369 | STORE_CHARACTER_AND_INCR | |
2370 | (b, RANGE_TABLE_WORK_ELT (range_table_work, i)); | |
2371 | } | |
25fe55af RS |
2372 | } |
2373 | break; | |
fa9a63c5 RM |
2374 | |
2375 | ||
b18215fc | 2376 | case '(': |
25fe55af RS |
2377 | if (syntax & RE_NO_BK_PARENS) |
2378 | goto handle_open; | |
2379 | else | |
2380 | goto normal_char; | |
fa9a63c5 RM |
2381 | |
2382 | ||
25fe55af RS |
2383 | case ')': |
2384 | if (syntax & RE_NO_BK_PARENS) | |
2385 | goto handle_close; | |
2386 | else | |
2387 | goto normal_char; | |
e318085a RS |
2388 | |
2389 | ||
25fe55af RS |
2390 | case '\n': |
2391 | if (syntax & RE_NEWLINE_ALT) | |
2392 | goto handle_alt; | |
2393 | else | |
2394 | goto normal_char; | |
e318085a RS |
2395 | |
2396 | ||
b18215fc | 2397 | case '|': |
25fe55af RS |
2398 | if (syntax & RE_NO_BK_VBAR) |
2399 | goto handle_alt; | |
2400 | else | |
2401 | goto normal_char; | |
2402 | ||
2403 | ||
2404 | case '{': | |
2405 | if (syntax & RE_INTERVALS && syntax & RE_NO_BK_BRACES) | |
2406 | goto handle_interval; | |
2407 | else | |
2408 | goto normal_char; | |
2409 | ||
2410 | ||
2411 | case '\\': | |
2412 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
2413 | ||
2414 | /* Do not translate the character after the \, so that we can | |
2415 | distinguish, e.g., \B from \b, even if we normally would | |
2416 | translate, e.g., B to b. */ | |
2417 | PATFETCH_RAW (c); | |
2418 | ||
2419 | switch (c) | |
2420 | { | |
2421 | case '(': | |
2422 | if (syntax & RE_NO_BK_PARENS) | |
2423 | goto normal_backslash; | |
2424 | ||
2425 | handle_open: | |
2426 | bufp->re_nsub++; | |
2427 | regnum++; | |
2428 | ||
2429 | if (COMPILE_STACK_FULL) | |
2430 | { | |
2431 | RETALLOC (compile_stack.stack, compile_stack.size << 1, | |
2432 | compile_stack_elt_t); | |
2433 | if (compile_stack.stack == NULL) return REG_ESPACE; | |
2434 | ||
2435 | compile_stack.size <<= 1; | |
2436 | } | |
2437 | ||
2438 | /* These are the values to restore when we hit end of this | |
2439 | group. They are all relative offsets, so that if the | |
2440 | whole pattern moves because of realloc, they will still | |
2441 | be valid. */ | |
2442 | COMPILE_STACK_TOP.begalt_offset = begalt - bufp->buffer; | |
2443 | COMPILE_STACK_TOP.fixup_alt_jump | |
2444 | = fixup_alt_jump ? fixup_alt_jump - bufp->buffer + 1 : 0; | |
2445 | COMPILE_STACK_TOP.laststart_offset = b - bufp->buffer; | |
2446 | COMPILE_STACK_TOP.regnum = regnum; | |
2447 | ||
2448 | /* We will eventually replace the 0 with the number of | |
2449 | groups inner to this one. But do not push a | |
2450 | start_memory for groups beyond the last one we can | |
2451 | represent in the compiled pattern. */ | |
2452 | if (regnum <= MAX_REGNUM) | |
2453 | { | |
2454 | COMPILE_STACK_TOP.inner_group_offset = b - bufp->buffer + 2; | |
2455 | BUF_PUSH_3 (start_memory, regnum, 0); | |
2456 | } | |
2457 | ||
2458 | compile_stack.avail++; | |
2459 | ||
2460 | fixup_alt_jump = 0; | |
2461 | laststart = 0; | |
2462 | begalt = b; | |
b18215fc RS |
2463 | /* If we've reached MAX_REGNUM groups, then this open |
2464 | won't actually generate any code, so we'll have to | |
2465 | clear pending_exact explicitly. */ | |
2466 | pending_exact = 0; | |
25fe55af RS |
2467 | break; |
2468 | ||
2469 | ||
2470 | case ')': | |
2471 | if (syntax & RE_NO_BK_PARENS) goto normal_backslash; | |
2472 | ||
2473 | if (COMPILE_STACK_EMPTY) | |
2474 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) | |
2475 | goto normal_backslash; | |
2476 | else | |
2477 | FREE_STACK_RETURN (REG_ERPAREN); | |
2478 | ||
2479 | handle_close: | |
2480 | if (fixup_alt_jump) | |
2481 | { /* Push a dummy failure point at the end of the | |
2482 | alternative for a possible future | |
2483 | `pop_failure_jump' to pop. See comments at | |
2484 | `push_dummy_failure' in `re_match_2'. */ | |
2485 | BUF_PUSH (push_dummy_failure); | |
2486 | ||
2487 | /* We allocated space for this jump when we assigned | |
2488 | to `fixup_alt_jump', in the `handle_alt' case below. */ | |
2489 | STORE_JUMP (jump_past_alt, fixup_alt_jump, b - 1); | |
2490 | } | |
2491 | ||
2492 | /* See similar code for backslashed left paren above. */ | |
2493 | if (COMPILE_STACK_EMPTY) | |
2494 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) | |
2495 | goto normal_char; | |
2496 | else | |
2497 | FREE_STACK_RETURN (REG_ERPAREN); | |
2498 | ||
2499 | /* Since we just checked for an empty stack above, this | |
2500 | ``can't happen''. */ | |
2501 | assert (compile_stack.avail != 0); | |
2502 | { | |
2503 | /* We don't just want to restore into `regnum', because | |
2504 | later groups should continue to be numbered higher, | |
2505 | as in `(ab)c(de)' -- the second group is #2. */ | |
2506 | regnum_t this_group_regnum; | |
2507 | ||
2508 | compile_stack.avail--; | |
2509 | begalt = bufp->buffer + COMPILE_STACK_TOP.begalt_offset; | |
2510 | fixup_alt_jump | |
2511 | = COMPILE_STACK_TOP.fixup_alt_jump | |
2512 | ? bufp->buffer + COMPILE_STACK_TOP.fixup_alt_jump - 1 | |
2513 | : 0; | |
2514 | laststart = bufp->buffer + COMPILE_STACK_TOP.laststart_offset; | |
2515 | this_group_regnum = COMPILE_STACK_TOP.regnum; | |
b18215fc RS |
2516 | /* If we've reached MAX_REGNUM groups, then this open |
2517 | won't actually generate any code, so we'll have to | |
2518 | clear pending_exact explicitly. */ | |
2519 | pending_exact = 0; | |
e318085a | 2520 | |
25fe55af RS |
2521 | /* We're at the end of the group, so now we know how many |
2522 | groups were inside this one. */ | |
2523 | if (this_group_regnum <= MAX_REGNUM) | |
2524 | { | |
2525 | unsigned char *inner_group_loc | |
2526 | = bufp->buffer + COMPILE_STACK_TOP.inner_group_offset; | |
2527 | ||
2528 | *inner_group_loc = regnum - this_group_regnum; | |
2529 | BUF_PUSH_3 (stop_memory, this_group_regnum, | |
2530 | regnum - this_group_regnum); | |
2531 | } | |
2532 | } | |
2533 | break; | |
2534 | ||
2535 | ||
2536 | case '|': /* `\|'. */ | |
2537 | if (syntax & RE_LIMITED_OPS || syntax & RE_NO_BK_VBAR) | |
2538 | goto normal_backslash; | |
2539 | handle_alt: | |
2540 | if (syntax & RE_LIMITED_OPS) | |
2541 | goto normal_char; | |
2542 | ||
2543 | /* Insert before the previous alternative a jump which | |
2544 | jumps to this alternative if the former fails. */ | |
2545 | GET_BUFFER_SPACE (3); | |
2546 | INSERT_JUMP (on_failure_jump, begalt, b + 6); | |
2547 | pending_exact = 0; | |
2548 | b += 3; | |
2549 | ||
2550 | /* The alternative before this one has a jump after it | |
2551 | which gets executed if it gets matched. Adjust that | |
2552 | jump so it will jump to this alternative's analogous | |
2553 | jump (put in below, which in turn will jump to the next | |
2554 | (if any) alternative's such jump, etc.). The last such | |
2555 | jump jumps to the correct final destination. A picture: | |
2556 | _____ _____ | |
2557 | | | | | | |
2558 | | v | v | |
2559 | a | b | c | |
2560 | ||
2561 | If we are at `b', then fixup_alt_jump right now points to a | |
2562 | three-byte space after `a'. We'll put in the jump, set | |
2563 | fixup_alt_jump to right after `b', and leave behind three | |
2564 | bytes which we'll fill in when we get to after `c'. */ | |
2565 | ||
2566 | if (fixup_alt_jump) | |
2567 | STORE_JUMP (jump_past_alt, fixup_alt_jump, b); | |
2568 | ||
2569 | /* Mark and leave space for a jump after this alternative, | |
2570 | to be filled in later either by next alternative or | |
2571 | when know we're at the end of a series of alternatives. */ | |
2572 | fixup_alt_jump = b; | |
2573 | GET_BUFFER_SPACE (3); | |
2574 | b += 3; | |
2575 | ||
2576 | laststart = 0; | |
2577 | begalt = b; | |
2578 | break; | |
2579 | ||
2580 | ||
2581 | case '{': | |
2582 | /* If \{ is a literal. */ | |
2583 | if (!(syntax & RE_INTERVALS) | |
2584 | /* If we're at `\{' and it's not the open-interval | |
2585 | operator. */ | |
2586 | || ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES)) | |
2587 | || (p - 2 == pattern && p == pend)) | |
2588 | goto normal_backslash; | |
2589 | ||
2590 | handle_interval: | |
2591 | { | |
2592 | /* If got here, then the syntax allows intervals. */ | |
2593 | ||
2594 | /* At least (most) this many matches must be made. */ | |
2595 | int lower_bound = -1, upper_bound = -1; | |
2596 | ||
2597 | beg_interval = p - 1; | |
2598 | ||
2599 | if (p == pend) | |
2600 | { | |
2601 | if (syntax & RE_NO_BK_BRACES) | |
2602 | goto unfetch_interval; | |
2603 | else | |
2604 | FREE_STACK_RETURN (REG_EBRACE); | |
2605 | } | |
2606 | ||
2607 | GET_UNSIGNED_NUMBER (lower_bound); | |
2608 | ||
2609 | if (c == ',') | |
2610 | { | |
2611 | GET_UNSIGNED_NUMBER (upper_bound); | |
2612 | if (upper_bound < 0) upper_bound = RE_DUP_MAX; | |
2613 | } | |
2614 | else | |
2615 | /* Interval such as `{1}' => match exactly once. */ | |
2616 | upper_bound = lower_bound; | |
2617 | ||
2618 | if (lower_bound < 0 || upper_bound > RE_DUP_MAX | |
2619 | || lower_bound > upper_bound) | |
2620 | { | |
2621 | if (syntax & RE_NO_BK_BRACES) | |
2622 | goto unfetch_interval; | |
2623 | else | |
2624 | FREE_STACK_RETURN (REG_BADBR); | |
2625 | } | |
2626 | ||
2627 | if (!(syntax & RE_NO_BK_BRACES)) | |
2628 | { | |
2629 | if (c != '\\') FREE_STACK_RETURN (REG_EBRACE); | |
2630 | ||
2631 | PATFETCH (c); | |
2632 | } | |
2633 | ||
2634 | if (c != '}') | |
2635 | { | |
2636 | if (syntax & RE_NO_BK_BRACES) | |
2637 | goto unfetch_interval; | |
2638 | else | |
2639 | FREE_STACK_RETURN (REG_BADBR); | |
2640 | } | |
2641 | ||
2642 | /* We just parsed a valid interval. */ | |
2643 | ||
2644 | /* If it's invalid to have no preceding re. */ | |
2645 | if (!laststart) | |
2646 | { | |
2647 | if (syntax & RE_CONTEXT_INVALID_OPS) | |
2648 | FREE_STACK_RETURN (REG_BADRPT); | |
2649 | else if (syntax & RE_CONTEXT_INDEP_OPS) | |
2650 | laststart = b; | |
2651 | else | |
2652 | goto unfetch_interval; | |
2653 | } | |
2654 | ||
2655 | /* If the upper bound is zero, don't want to succeed at | |
2656 | all; jump from `laststart' to `b + 3', which will be | |
2657 | the end of the buffer after we insert the jump. */ | |
2658 | if (upper_bound == 0) | |
2659 | { | |
2660 | GET_BUFFER_SPACE (3); | |
2661 | INSERT_JUMP (jump, laststart, b + 3); | |
2662 | b += 3; | |
2663 | } | |
2664 | ||
2665 | /* Otherwise, we have a nontrivial interval. When | |
2666 | we're all done, the pattern will look like: | |
2667 | set_number_at <jump count> <upper bound> | |
2668 | set_number_at <succeed_n count> <lower bound> | |
2669 | succeed_n <after jump addr> <succeed_n count> | |
2670 | <body of loop> | |
2671 | jump_n <succeed_n addr> <jump count> | |
2672 | (The upper bound and `jump_n' are omitted if | |
2673 | `upper_bound' is 1, though.) */ | |
2674 | else | |
2675 | { /* If the upper bound is > 1, we need to insert | |
2676 | more at the end of the loop. */ | |
2677 | unsigned nbytes = 10 + (upper_bound > 1) * 10; | |
2678 | ||
2679 | GET_BUFFER_SPACE (nbytes); | |
2680 | ||
2681 | /* Initialize lower bound of the `succeed_n', even | |
2682 | though it will be set during matching by its | |
2683 | attendant `set_number_at' (inserted next), | |
2684 | because `re_compile_fastmap' needs to know. | |
2685 | Jump to the `jump_n' we might insert below. */ | |
2686 | INSERT_JUMP2 (succeed_n, laststart, | |
2687 | b + 5 + (upper_bound > 1) * 5, | |
2688 | lower_bound); | |
2689 | b += 5; | |
2690 | ||
2691 | /* Code to initialize the lower bound. Insert | |
2692 | before the `succeed_n'. The `5' is the last two | |
2693 | bytes of this `set_number_at', plus 3 bytes of | |
2694 | the following `succeed_n'. */ | |
2695 | insert_op2 (set_number_at, laststart, 5, lower_bound, b); | |
2696 | b += 5; | |
2697 | ||
2698 | if (upper_bound > 1) | |
2699 | { /* More than one repetition is allowed, so | |
2700 | append a backward jump to the `succeed_n' | |
2701 | that starts this interval. | |
2702 | ||
2703 | When we've reached this during matching, | |
2704 | we'll have matched the interval once, so | |
2705 | jump back only `upper_bound - 1' times. */ | |
2706 | STORE_JUMP2 (jump_n, b, laststart + 5, | |
2707 | upper_bound - 1); | |
2708 | b += 5; | |
2709 | ||
2710 | /* The location we want to set is the second | |
2711 | parameter of the `jump_n'; that is `b-2' as | |
2712 | an absolute address. `laststart' will be | |
2713 | the `set_number_at' we're about to insert; | |
2714 | `laststart+3' the number to set, the source | |
2715 | for the relative address. But we are | |
2716 | inserting into the middle of the pattern -- | |
2717 | so everything is getting moved up by 5. | |
2718 | Conclusion: (b - 2) - (laststart + 3) + 5, | |
2719 | i.e., b - laststart. | |
2720 | ||
2721 | We insert this at the beginning of the loop | |
2722 | so that if we fail during matching, we'll | |
2723 | reinitialize the bounds. */ | |
2724 | insert_op2 (set_number_at, laststart, b - laststart, | |
2725 | upper_bound - 1, b); | |
2726 | b += 5; | |
2727 | } | |
2728 | } | |
2729 | pending_exact = 0; | |
2730 | beg_interval = NULL; | |
2731 | } | |
2732 | break; | |
2733 | ||
2734 | unfetch_interval: | |
2735 | /* If an invalid interval, match the characters as literals. */ | |
2736 | assert (beg_interval); | |
2737 | p = beg_interval; | |
2738 | beg_interval = NULL; | |
2739 | ||
2740 | /* normal_char and normal_backslash need `c'. */ | |
2741 | PATFETCH (c); | |
2742 | ||
2743 | if (!(syntax & RE_NO_BK_BRACES)) | |
2744 | { | |
2745 | if (p > pattern && p[-1] == '\\') | |
2746 | goto normal_backslash; | |
2747 | } | |
2748 | goto normal_char; | |
e318085a | 2749 | |
b18215fc | 2750 | #ifdef emacs |
25fe55af RS |
2751 | /* There is no way to specify the before_dot and after_dot |
2752 | operators. rms says this is ok. --karl */ | |
2753 | case '=': | |
2754 | BUF_PUSH (at_dot); | |
2755 | break; | |
2756 | ||
2757 | case 's': | |
2758 | laststart = b; | |
2759 | PATFETCH (c); | |
2760 | BUF_PUSH_2 (syntaxspec, syntax_spec_code[c]); | |
2761 | break; | |
2762 | ||
2763 | case 'S': | |
2764 | laststart = b; | |
2765 | PATFETCH (c); | |
2766 | BUF_PUSH_2 (notsyntaxspec, syntax_spec_code[c]); | |
2767 | break; | |
b18215fc RS |
2768 | |
2769 | case 'c': | |
2770 | laststart = b; | |
2771 | PATFETCH_RAW (c); | |
2772 | BUF_PUSH_2 (categoryspec, c); | |
2773 | break; | |
e318085a | 2774 | |
b18215fc RS |
2775 | case 'C': |
2776 | laststart = b; | |
2777 | PATFETCH_RAW (c); | |
2778 | BUF_PUSH_2 (notcategoryspec, c); | |
2779 | break; | |
2780 | #endif /* emacs */ | |
e318085a | 2781 | |
e318085a | 2782 | |
25fe55af RS |
2783 | case 'w': |
2784 | laststart = b; | |
2785 | BUF_PUSH (wordchar); | |
2786 | break; | |
e318085a | 2787 | |
e318085a | 2788 | |
25fe55af RS |
2789 | case 'W': |
2790 | laststart = b; | |
2791 | BUF_PUSH (notwordchar); | |
2792 | break; | |
e318085a RS |
2793 | |
2794 | ||
25fe55af RS |
2795 | case '<': |
2796 | BUF_PUSH (wordbeg); | |
2797 | break; | |
e318085a | 2798 | |
25fe55af RS |
2799 | case '>': |
2800 | BUF_PUSH (wordend); | |
2801 | break; | |
e318085a | 2802 | |
25fe55af RS |
2803 | case 'b': |
2804 | BUF_PUSH (wordbound); | |
2805 | break; | |
e318085a | 2806 | |
25fe55af RS |
2807 | case 'B': |
2808 | BUF_PUSH (notwordbound); | |
2809 | break; | |
fa9a63c5 | 2810 | |
25fe55af RS |
2811 | case '`': |
2812 | BUF_PUSH (begbuf); | |
2813 | break; | |
e318085a | 2814 | |
25fe55af RS |
2815 | case '\'': |
2816 | BUF_PUSH (endbuf); | |
2817 | break; | |
e318085a | 2818 | |
25fe55af RS |
2819 | case '1': case '2': case '3': case '4': case '5': |
2820 | case '6': case '7': case '8': case '9': | |
2821 | if (syntax & RE_NO_BK_REFS) | |
2822 | goto normal_char; | |
e318085a | 2823 | |
25fe55af | 2824 | c1 = c - '0'; |
e318085a | 2825 | |
25fe55af RS |
2826 | if (c1 > regnum) |
2827 | FREE_STACK_RETURN (REG_ESUBREG); | |
e318085a | 2828 | |
25fe55af RS |
2829 | /* Can't back reference to a subexpression if inside of it. */ |
2830 | if (group_in_compile_stack (compile_stack, c1)) | |
2831 | goto normal_char; | |
e318085a | 2832 | |
25fe55af RS |
2833 | laststart = b; |
2834 | BUF_PUSH_2 (duplicate, c1); | |
2835 | break; | |
e318085a | 2836 | |
e318085a | 2837 | |
25fe55af RS |
2838 | case '+': |
2839 | case '?': | |
2840 | if (syntax & RE_BK_PLUS_QM) | |
2841 | goto handle_plus; | |
2842 | else | |
2843 | goto normal_backslash; | |
2844 | ||
2845 | default: | |
2846 | normal_backslash: | |
2847 | /* You might think it would be useful for \ to mean | |
2848 | not to translate; but if we don't translate it | |
2849 | it will never match anything. */ | |
2850 | c = TRANSLATE (c); | |
2851 | goto normal_char; | |
2852 | } | |
2853 | break; | |
fa9a63c5 RM |
2854 | |
2855 | ||
2856 | default: | |
25fe55af | 2857 | /* Expects the character in `c'. */ |
fa9a63c5 | 2858 | normal_char: |
b18215fc RS |
2859 | p1 = p - 1; /* P1 points the head of C. */ |
2860 | #ifdef emacs | |
2861 | if (bufp->multibyte) | |
2862 | /* Set P to the next character boundary. */ | |
2863 | p += MULTIBYTE_FORM_LENGTH (p1, pend - p1) - 1; | |
2864 | #endif | |
fa9a63c5 | 2865 | /* If no exactn currently being built. */ |
25fe55af | 2866 | if (!pending_exact |
fa9a63c5 | 2867 | |
25fe55af RS |
2868 | /* If last exactn not at current position. */ |
2869 | || pending_exact + *pending_exact + 1 != b | |
5e69f11e | 2870 | |
25fe55af | 2871 | /* We have only one byte following the exactn for the count. */ |
b18215fc | 2872 | || *pending_exact >= (1 << BYTEWIDTH) - (p - p1) |
fa9a63c5 | 2873 | |
25fe55af RS |
2874 | /* If followed by a repetition operator. */ |
2875 | || *p == '*' || *p == '^' | |
fa9a63c5 RM |
2876 | || ((syntax & RE_BK_PLUS_QM) |
2877 | ? *p == '\\' && (p[1] == '+' || p[1] == '?') | |
2878 | : (*p == '+' || *p == '?')) | |
2879 | || ((syntax & RE_INTERVALS) | |
25fe55af | 2880 | && ((syntax & RE_NO_BK_BRACES) |
fa9a63c5 | 2881 | ? *p == '{' |
25fe55af | 2882 | : (p[0] == '\\' && p[1] == '{')))) |
fa9a63c5 RM |
2883 | { |
2884 | /* Start building a new exactn. */ | |
5e69f11e | 2885 | |
25fe55af | 2886 | laststart = b; |
fa9a63c5 RM |
2887 | |
2888 | BUF_PUSH_2 (exactn, 0); | |
2889 | pending_exact = b - 1; | |
25fe55af | 2890 | } |
5e69f11e | 2891 | |
b18215fc RS |
2892 | /* Here, C may translated, therefore C may not equal to *P1. */ |
2893 | while (1) | |
2894 | { | |
fa9a63c5 | 2895 | BUF_PUSH (c); |
25fe55af | 2896 | (*pending_exact)++; |
b18215fc RS |
2897 | if (++p1 == p) |
2898 | break; | |
2899 | ||
2900 | /* Rest of multibyte form should be copied literally. */ | |
2901 | c = *(unsigned char *)p1; | |
2902 | } | |
fa9a63c5 | 2903 | break; |
25fe55af | 2904 | } /* switch (c) */ |
fa9a63c5 RM |
2905 | } /* while p != pend */ |
2906 | ||
5e69f11e | 2907 | |
fa9a63c5 | 2908 | /* Through the pattern now. */ |
5e69f11e | 2909 | |
fa9a63c5 RM |
2910 | if (fixup_alt_jump) |
2911 | STORE_JUMP (jump_past_alt, fixup_alt_jump, b); | |
2912 | ||
5e69f11e | 2913 | if (!COMPILE_STACK_EMPTY) |
fa9a63c5 RM |
2914 | FREE_STACK_RETURN (REG_EPAREN); |
2915 | ||
2916 | /* If we don't want backtracking, force success | |
2917 | the first time we reach the end of the compiled pattern. */ | |
2918 | if (syntax & RE_NO_POSIX_BACKTRACKING) | |
2919 | BUF_PUSH (succeed); | |
2920 | ||
2921 | free (compile_stack.stack); | |
2922 | ||
2923 | /* We have succeeded; set the length of the buffer. */ | |
2924 | bufp->used = b - bufp->buffer; | |
2925 | ||
2926 | #ifdef DEBUG | |
2927 | if (debug) | |
2928 | { | |
2929 | DEBUG_PRINT1 ("\nCompiled pattern: \n"); | |
2930 | print_compiled_pattern (bufp); | |
2931 | } | |
2932 | #endif /* DEBUG */ | |
2933 | ||
2934 | #ifndef MATCH_MAY_ALLOCATE | |
2935 | /* Initialize the failure stack to the largest possible stack. This | |
2936 | isn't necessary unless we're trying to avoid calling alloca in | |
2937 | the search and match routines. */ | |
2938 | { | |
2939 | int num_regs = bufp->re_nsub + 1; | |
2940 | ||
2941 | /* Since DOUBLE_FAIL_STACK refuses to double only if the current size | |
2942 | is strictly greater than re_max_failures, the largest possible stack | |
2943 | is 2 * re_max_failures failure points. */ | |
2944 | if (fail_stack.size < (2 * re_max_failures * MAX_FAILURE_ITEMS)) | |
2945 | { | |
2946 | fail_stack.size = (2 * re_max_failures * MAX_FAILURE_ITEMS); | |
2947 | ||
2948 | #ifdef emacs | |
2949 | if (! fail_stack.stack) | |
2950 | fail_stack.stack | |
5e69f11e | 2951 | = (fail_stack_elt_t *) xmalloc (fail_stack.size |
fa9a63c5 RM |
2952 | * sizeof (fail_stack_elt_t)); |
2953 | else | |
2954 | fail_stack.stack | |
2955 | = (fail_stack_elt_t *) xrealloc (fail_stack.stack, | |
2956 | (fail_stack.size | |
2957 | * sizeof (fail_stack_elt_t))); | |
2958 | #else /* not emacs */ | |
2959 | if (! fail_stack.stack) | |
2960 | fail_stack.stack | |
5e69f11e | 2961 | = (fail_stack_elt_t *) malloc (fail_stack.size |
fa9a63c5 RM |
2962 | * sizeof (fail_stack_elt_t)); |
2963 | else | |
2964 | fail_stack.stack | |
2965 | = (fail_stack_elt_t *) realloc (fail_stack.stack, | |
2966 | (fail_stack.size | |
2967 | * sizeof (fail_stack_elt_t))); | |
2968 | #endif /* not emacs */ | |
2969 | } | |
2970 | ||
2971 | regex_grow_registers (num_regs); | |
2972 | } | |
2973 | #endif /* not MATCH_MAY_ALLOCATE */ | |
2974 | ||
2975 | return REG_NOERROR; | |
2976 | } /* regex_compile */ | |
2977 | \f | |
2978 | /* Subroutines for `regex_compile'. */ | |
2979 | ||
25fe55af | 2980 | /* Store OP at LOC followed by two-byte integer parameter ARG. */ |
fa9a63c5 RM |
2981 | |
2982 | static void | |
2983 | store_op1 (op, loc, arg) | |
2984 | re_opcode_t op; | |
2985 | unsigned char *loc; | |
2986 | int arg; | |
2987 | { | |
2988 | *loc = (unsigned char) op; | |
2989 | STORE_NUMBER (loc + 1, arg); | |
2990 | } | |
2991 | ||
2992 | ||
2993 | /* Like `store_op1', but for two two-byte parameters ARG1 and ARG2. */ | |
2994 | ||
2995 | static void | |
2996 | store_op2 (op, loc, arg1, arg2) | |
2997 | re_opcode_t op; | |
2998 | unsigned char *loc; | |
2999 | int arg1, arg2; | |
3000 | { | |
3001 | *loc = (unsigned char) op; | |
3002 | STORE_NUMBER (loc + 1, arg1); | |
3003 | STORE_NUMBER (loc + 3, arg2); | |
3004 | } | |
3005 | ||
3006 | ||
3007 | /* Copy the bytes from LOC to END to open up three bytes of space at LOC | |
3008 | for OP followed by two-byte integer parameter ARG. */ | |
3009 | ||
3010 | static void | |
3011 | insert_op1 (op, loc, arg, end) | |
3012 | re_opcode_t op; | |
3013 | unsigned char *loc; | |
3014 | int arg; | |
5e69f11e | 3015 | unsigned char *end; |
fa9a63c5 RM |
3016 | { |
3017 | register unsigned char *pfrom = end; | |
3018 | register unsigned char *pto = end + 3; | |
3019 | ||
3020 | while (pfrom != loc) | |
3021 | *--pto = *--pfrom; | |
5e69f11e | 3022 | |
fa9a63c5 RM |
3023 | store_op1 (op, loc, arg); |
3024 | } | |
3025 | ||
3026 | ||
3027 | /* Like `insert_op1', but for two two-byte parameters ARG1 and ARG2. */ | |
3028 | ||
3029 | static void | |
3030 | insert_op2 (op, loc, arg1, arg2, end) | |
3031 | re_opcode_t op; | |
3032 | unsigned char *loc; | |
3033 | int arg1, arg2; | |
5e69f11e | 3034 | unsigned char *end; |
fa9a63c5 RM |
3035 | { |
3036 | register unsigned char *pfrom = end; | |
3037 | register unsigned char *pto = end + 5; | |
3038 | ||
3039 | while (pfrom != loc) | |
3040 | *--pto = *--pfrom; | |
5e69f11e | 3041 | |
fa9a63c5 RM |
3042 | store_op2 (op, loc, arg1, arg2); |
3043 | } | |
3044 | ||
3045 | ||
3046 | /* P points to just after a ^ in PATTERN. Return true if that ^ comes | |
3047 | after an alternative or a begin-subexpression. We assume there is at | |
3048 | least one character before the ^. */ | |
3049 | ||
3050 | static boolean | |
3051 | at_begline_loc_p (pattern, p, syntax) | |
3052 | const char *pattern, *p; | |
3053 | reg_syntax_t syntax; | |
3054 | { | |
3055 | const char *prev = p - 2; | |
3056 | boolean prev_prev_backslash = prev > pattern && prev[-1] == '\\'; | |
5e69f11e | 3057 | |
fa9a63c5 RM |
3058 | return |
3059 | /* After a subexpression? */ | |
3060 | (*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash)) | |
25fe55af | 3061 | /* After an alternative? */ |
fa9a63c5 RM |
3062 | || (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash)); |
3063 | } | |
3064 | ||
3065 | ||
3066 | /* The dual of at_begline_loc_p. This one is for $. We assume there is | |
3067 | at least one character after the $, i.e., `P < PEND'. */ | |
3068 | ||
3069 | static boolean | |
3070 | at_endline_loc_p (p, pend, syntax) | |
3071 | const char *p, *pend; | |
3072 | int syntax; | |
3073 | { | |
3074 | const char *next = p; | |
3075 | boolean next_backslash = *next == '\\'; | |
5bb52971 | 3076 | const char *next_next = p + 1 < pend ? p + 1 : 0; |
5e69f11e | 3077 | |
fa9a63c5 RM |
3078 | return |
3079 | /* Before a subexpression? */ | |
3080 | (syntax & RE_NO_BK_PARENS ? *next == ')' | |
25fe55af | 3081 | : next_backslash && next_next && *next_next == ')') |
fa9a63c5 RM |
3082 | /* Before an alternative? */ |
3083 | || (syntax & RE_NO_BK_VBAR ? *next == '|' | |
25fe55af | 3084 | : next_backslash && next_next && *next_next == '|'); |
fa9a63c5 RM |
3085 | } |
3086 | ||
3087 | ||
5e69f11e | 3088 | /* Returns true if REGNUM is in one of COMPILE_STACK's elements and |
fa9a63c5 RM |
3089 | false if it's not. */ |
3090 | ||
3091 | static boolean | |
3092 | group_in_compile_stack (compile_stack, regnum) | |
3093 | compile_stack_type compile_stack; | |
3094 | regnum_t regnum; | |
3095 | { | |
3096 | int this_element; | |
3097 | ||
5e69f11e RM |
3098 | for (this_element = compile_stack.avail - 1; |
3099 | this_element >= 0; | |
fa9a63c5 RM |
3100 | this_element--) |
3101 | if (compile_stack.stack[this_element].regnum == regnum) | |
3102 | return true; | |
3103 | ||
3104 | return false; | |
3105 | } | |
3106 | ||
3107 | ||
3108 | /* Read the ending character of a range (in a bracket expression) from the | |
3109 | uncompiled pattern *P_PTR (which ends at PEND). We assume the | |
3110 | starting character is in `P[-2]'. (`P[-1]' is the character `-'.) | |
3111 | Then we set the translation of all bits between the starting and | |
3112 | ending characters (inclusive) in the compiled pattern B. | |
5e69f11e | 3113 | |
fa9a63c5 | 3114 | Return an error code. |
5e69f11e | 3115 | |
fa9a63c5 RM |
3116 | We use these short variable names so we can use the same macros as |
3117 | `regex_compile' itself. */ | |
3118 | ||
3119 | static reg_errcode_t | |
3120 | compile_range (p_ptr, pend, translate, syntax, b) | |
3121 | const char **p_ptr, *pend; | |
6676cb1c | 3122 | RE_TRANSLATE_TYPE translate; |
fa9a63c5 RM |
3123 | reg_syntax_t syntax; |
3124 | unsigned char *b; | |
3125 | { | |
3126 | unsigned this_char; | |
3127 | ||
3128 | const char *p = *p_ptr; | |
3129 | int range_start, range_end; | |
5e69f11e | 3130 | |
fa9a63c5 RM |
3131 | if (p == pend) |
3132 | return REG_ERANGE; | |
3133 | ||
3134 | /* Even though the pattern is a signed `char *', we need to fetch | |
3135 | with unsigned char *'s; if the high bit of the pattern character | |
3136 | is set, the range endpoints will be negative if we fetch using a | |
3137 | signed char *. | |
3138 | ||
5e69f11e | 3139 | We also want to fetch the endpoints without translating them; the |
fa9a63c5 RM |
3140 | appropriate translation is done in the bit-setting loop below. */ |
3141 | /* The SVR4 compiler on the 3B2 had trouble with unsigned const char *. */ | |
3142 | range_start = ((const unsigned char *) p)[-2]; | |
3143 | range_end = ((const unsigned char *) p)[0]; | |
3144 | ||
3145 | /* Have to increment the pointer into the pattern string, so the | |
3146 | caller isn't still at the ending character. */ | |
3147 | (*p_ptr)++; | |
3148 | ||
25fe55af | 3149 | /* If the start is after the end, the range is empty. */ |
fa9a63c5 RM |
3150 | if (range_start > range_end) |
3151 | return syntax & RE_NO_EMPTY_RANGES ? REG_ERANGE : REG_NOERROR; | |
3152 | ||
3153 | /* Here we see why `this_char' has to be larger than an `unsigned | |
3154 | char' -- the range is inclusive, so if `range_end' == 0xff | |
3155 | (assuming 8-bit characters), we would otherwise go into an infinite | |
3156 | loop, since all characters <= 0xff. */ | |
3157 | for (this_char = range_start; this_char <= range_end; this_char++) | |
3158 | { | |
3159 | SET_LIST_BIT (TRANSLATE (this_char)); | |
3160 | } | |
5e69f11e | 3161 | |
fa9a63c5 RM |
3162 | return REG_NOERROR; |
3163 | } | |
3164 | \f | |
3165 | /* re_compile_fastmap computes a ``fastmap'' for the compiled pattern in | |
3166 | BUFP. A fastmap records which of the (1 << BYTEWIDTH) possible | |
3167 | characters can start a string that matches the pattern. This fastmap | |
3168 | is used by re_search to skip quickly over impossible starting points. | |
3169 | ||
3170 | The caller must supply the address of a (1 << BYTEWIDTH)-byte data | |
3171 | area as BUFP->fastmap. | |
5e69f11e | 3172 | |
fa9a63c5 RM |
3173 | We set the `fastmap', `fastmap_accurate', and `can_be_null' fields in |
3174 | the pattern buffer. | |
3175 | ||
3176 | Returns 0 if we succeed, -2 if an internal error. */ | |
3177 | ||
3178 | int | |
3179 | re_compile_fastmap (bufp) | |
3180 | struct re_pattern_buffer *bufp; | |
3181 | { | |
b18215fc | 3182 | int i, j, k; |
fa9a63c5 RM |
3183 | #ifdef MATCH_MAY_ALLOCATE |
3184 | fail_stack_type fail_stack; | |
3185 | #endif | |
3186 | #ifndef REGEX_MALLOC | |
3187 | char *destination; | |
3188 | #endif | |
3189 | /* We don't push any register information onto the failure stack. */ | |
3190 | unsigned num_regs = 0; | |
5e69f11e | 3191 | |
fa9a63c5 RM |
3192 | register char *fastmap = bufp->fastmap; |
3193 | unsigned char *pattern = bufp->buffer; | |
3194 | unsigned long size = bufp->used; | |
3195 | unsigned char *p = pattern; | |
3196 | register unsigned char *pend = pattern + size; | |
3197 | ||
3198 | /* This holds the pointer to the failure stack, when | |
3199 | it is allocated relocatably. */ | |
3200 | fail_stack_elt_t *failure_stack_ptr; | |
3201 | ||
3202 | /* Assume that each path through the pattern can be null until | |
25fe55af | 3203 | proven otherwise. We set this false at the bottom of switch |
fa9a63c5 RM |
3204 | statement, to which we get only if a particular path doesn't |
3205 | match the empty string. */ | |
3206 | boolean path_can_be_null = true; | |
3207 | ||
3208 | /* We aren't doing a `succeed_n' to begin with. */ | |
3209 | boolean succeed_n_p = false; | |
3210 | ||
b18215fc | 3211 | /* If all elements for base leading-codes in fastmap is set, this |
25fe55af | 3212 | flag is set true. */ |
b18215fc RS |
3213 | boolean match_any_multibyte_characters = false; |
3214 | ||
3215 | /* Maximum code of simple (single byte) character. */ | |
3216 | int simple_char_max; | |
3217 | ||
fa9a63c5 | 3218 | assert (fastmap != NULL && p != NULL); |
5e69f11e | 3219 | |
fa9a63c5 | 3220 | INIT_FAIL_STACK (); |
25fe55af | 3221 | bzero (fastmap, 1 << BYTEWIDTH); /* Assume nothing's valid. */ |
fa9a63c5 RM |
3222 | bufp->fastmap_accurate = 1; /* It will be when we're done. */ |
3223 | bufp->can_be_null = 0; | |
5e69f11e | 3224 | |
fa9a63c5 RM |
3225 | while (1) |
3226 | { | |
3227 | if (p == pend || *p == succeed) | |
3228 | { | |
3229 | /* We have reached the (effective) end of pattern. */ | |
3230 | if (!FAIL_STACK_EMPTY ()) | |
3231 | { | |
3232 | bufp->can_be_null |= path_can_be_null; | |
3233 | ||
3234 | /* Reset for next path. */ | |
3235 | path_can_be_null = true; | |
3236 | ||
3237 | p = fail_stack.stack[--fail_stack.avail].pointer; | |
3238 | ||
3239 | continue; | |
3240 | } | |
3241 | else | |
3242 | break; | |
3243 | } | |
3244 | ||
25fe55af | 3245 | /* We should never be about to go beyond the end of the pattern. */ |
fa9a63c5 | 3246 | assert (p < pend); |
5e69f11e | 3247 | |
fa9a63c5 RM |
3248 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++)) |
3249 | { | |
3250 | ||
25fe55af RS |
3251 | /* I guess the idea here is to simply not bother with a fastmap |
3252 | if a backreference is used, since it's too hard to figure out | |
3253 | the fastmap for the corresponding group. Setting | |
3254 | `can_be_null' stops `re_search_2' from using the fastmap, so | |
3255 | that is all we do. */ | |
fa9a63c5 RM |
3256 | case duplicate: |
3257 | bufp->can_be_null = 1; | |
25fe55af | 3258 | goto done; |
fa9a63c5 RM |
3259 | |
3260 | ||
3261 | /* Following are the cases which match a character. These end | |
25fe55af | 3262 | with `break'. */ |
fa9a63c5 RM |
3263 | |
3264 | case exactn: | |
25fe55af | 3265 | fastmap[p[1]] = 1; |
fa9a63c5 RM |
3266 | break; |
3267 | ||
3268 | ||
b18215fc | 3269 | #ifndef emacs |
25fe55af RS |
3270 | case charset: |
3271 | for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--) | |
fa9a63c5 | 3272 | if (p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))) |
25fe55af | 3273 | fastmap[j] = 1; |
fa9a63c5 RM |
3274 | break; |
3275 | ||
3276 | ||
3277 | case charset_not: | |
3278 | /* Chars beyond end of map must be allowed. */ | |
3279 | for (j = *p * BYTEWIDTH; j < (1 << BYTEWIDTH); j++) | |
25fe55af | 3280 | fastmap[j] = 1; |
fa9a63c5 RM |
3281 | |
3282 | for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--) | |
3283 | if (!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH)))) | |
25fe55af RS |
3284 | fastmap[j] = 1; |
3285 | break; | |
fa9a63c5 RM |
3286 | |
3287 | ||
3288 | case wordchar: | |
3289 | for (j = 0; j < (1 << BYTEWIDTH); j++) | |
3290 | if (SYNTAX (j) == Sword) | |
3291 | fastmap[j] = 1; | |
3292 | break; | |
3293 | ||
3294 | ||
3295 | case notwordchar: | |
3296 | for (j = 0; j < (1 << BYTEWIDTH); j++) | |
3297 | if (SYNTAX (j) != Sword) | |
3298 | fastmap[j] = 1; | |
3299 | break; | |
b18215fc RS |
3300 | #else /* emacs */ |
3301 | case charset: | |
3302 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH - 1, p++; | |
3303 | j >= 0; j--) | |
3304 | if (p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))) | |
3305 | fastmap[j] = 1; | |
3306 | ||
3307 | if (CHARSET_RANGE_TABLE_EXISTS_P (&p[-2]) | |
3308 | && match_any_multibyte_characters == false) | |
3309 | { | |
3310 | /* Set fastmap[I] 1 where I is a base leading code of each | |
3311 | multibyte character in the range table. */ | |
3312 | int c, count; | |
3313 | ||
3314 | /* Make P points the range table. */ | |
3315 | p += CHARSET_BITMAP_SIZE (&p[-2]); | |
3316 | ||
3317 | /* Extract the number of ranges in range table into | |
25fe55af | 3318 | COUNT. */ |
b18215fc RS |
3319 | EXTRACT_NUMBER_AND_INCR (count, p); |
3320 | for (; count > 0; count--, p += 2 * 3) /* XXX */ | |
3321 | { | |
3322 | /* Extract the start of each range. */ | |
3323 | EXTRACT_CHARACTER (c, p); | |
3324 | j = CHAR_CHARSET (c); | |
3325 | fastmap[CHARSET_LEADING_CODE_BASE (j)] = 1; | |
3326 | } | |
3327 | } | |
3328 | break; | |
fa9a63c5 RM |
3329 | |
3330 | ||
b18215fc RS |
3331 | case charset_not: |
3332 | /* Chars beyond end of map must be allowed. End of map is | |
3333 | `127' if bufp->multibyte is nonzero. */ | |
3334 | simple_char_max = bufp->multibyte ? 0x80 : (1 << BYTEWIDTH); | |
3335 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH; | |
3336 | j < simple_char_max; j++) | |
3337 | fastmap[j] = 1; | |
3338 | ||
3339 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH - 1, p++; | |
3340 | j >= 0; j--) | |
3341 | if (!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH)))) | |
3342 | fastmap[j] = 1; | |
3343 | ||
3344 | if (bufp->multibyte) | |
3345 | /* Any character set can possibly contain a character | |
3346 | which doesn't match the specified set of characters. */ | |
3347 | { | |
3348 | set_fastmap_for_multibyte_characters: | |
3349 | if (match_any_multibyte_characters == false) | |
3350 | { | |
3351 | for (j = 0x80; j < 0xA0; j++) /* XXX */ | |
3352 | if (BASE_LEADING_CODE_P (j)) | |
3353 | fastmap[j] = 1; | |
3354 | match_any_multibyte_characters = true; | |
3355 | } | |
3356 | } | |
3357 | break; | |
3358 | ||
3359 | ||
3360 | case wordchar: | |
3361 | simple_char_max = bufp->multibyte ? 0x80 : (1 << BYTEWIDTH); | |
3362 | for (j = 0; j < simple_char_max; j++) | |
3363 | if (SYNTAX (j) == Sword) | |
3364 | fastmap[j] = 1; | |
3365 | ||
3366 | if (bufp->multibyte) | |
3367 | /* Any character set can possibly contain a character | |
25fe55af | 3368 | whose syntax is `Sword'. */ |
b18215fc RS |
3369 | goto set_fastmap_for_multibyte_characters; |
3370 | break; | |
3371 | ||
3372 | ||
3373 | case notwordchar: | |
3374 | simple_char_max = bufp->multibyte ? 0x80 : (1 << BYTEWIDTH); | |
3375 | for (j = 0; j < simple_char_max; j++) | |
3376 | if (SYNTAX (j) != Sword) | |
3377 | fastmap[j] = 1; | |
3378 | ||
3379 | if (bufp->multibyte) | |
3380 | /* Any character set can possibly contain a character | |
3381 | whose syntax is not `Sword'. */ | |
3382 | goto set_fastmap_for_multibyte_characters; | |
3383 | break; | |
3384 | #endif | |
3385 | ||
25fe55af | 3386 | case anychar: |
fa9a63c5 RM |
3387 | { |
3388 | int fastmap_newline = fastmap['\n']; | |
3389 | ||
b18215fc RS |
3390 | /* `.' matches anything (but if bufp->multibyte is |
3391 | nonzero, matches `\000' .. `\127' and possible multibyte | |
3392 | character) ... */ | |
3393 | if (bufp->multibyte) | |
3394 | { | |
3395 | simple_char_max = 0x80; | |
3396 | ||
3397 | for (j = 0x80; j < 0xA0; j++) | |
3398 | if (BASE_LEADING_CODE_P (j)) | |
3399 | fastmap[j] = 1; | |
3400 | match_any_multibyte_characters = true; | |
3401 | } | |
3402 | else | |
3403 | simple_char_max = (1 << BYTEWIDTH); | |
3404 | ||
3405 | for (j = 0; j < simple_char_max; j++) | |
fa9a63c5 RM |
3406 | fastmap[j] = 1; |
3407 | ||
3408 | /* ... except perhaps newline. */ | |
3409 | if (!(bufp->syntax & RE_DOT_NEWLINE)) | |
3410 | fastmap['\n'] = fastmap_newline; | |
3411 | ||
3412 | /* Return if we have already set `can_be_null'; if we have, | |
25fe55af | 3413 | then the fastmap is irrelevant. Something's wrong here. */ |
fa9a63c5 RM |
3414 | else if (bufp->can_be_null) |
3415 | goto done; | |
3416 | ||
3417 | /* Otherwise, have to check alternative paths. */ | |
3418 | break; | |
3419 | } | |
3420 | ||
3421 | #ifdef emacs | |
b18215fc RS |
3422 | case wordbound: |
3423 | case notwordbound: | |
3424 | case wordbeg: | |
3425 | case wordend: | |
3426 | case notsyntaxspec: | |
25fe55af | 3427 | case syntaxspec: |
b18215fc RS |
3428 | /* This match depends on text properties. These end with |
3429 | aborting optimizations. */ | |
3430 | bufp->can_be_null = 1; | |
25fe55af | 3431 | goto done; |
b18215fc | 3432 | #if 0 |
fa9a63c5 | 3433 | k = *p++; |
b18215fc RS |
3434 | simple_char_max = bufp->multibyte ? 0x80 : (1 << BYTEWIDTH); |
3435 | for (j = 0; j < simple_char_max; j++) | |
fa9a63c5 RM |
3436 | if (SYNTAX (j) == (enum syntaxcode) k) |
3437 | fastmap[j] = 1; | |
fa9a63c5 | 3438 | |
b18215fc RS |
3439 | if (bufp->multibyte) |
3440 | /* Any character set can possibly contain a character | |
3441 | whose syntax is K. */ | |
3442 | goto set_fastmap_for_multibyte_characters; | |
3443 | break; | |
fa9a63c5 RM |
3444 | |
3445 | case notsyntaxspec: | |
3446 | k = *p++; | |
b18215fc RS |
3447 | simple_char_max = bufp->multibyte ? 0x80 : (1 << BYTEWIDTH); |
3448 | for (j = 0; j < simple_char_max; j++) | |
fa9a63c5 RM |
3449 | if (SYNTAX (j) != (enum syntaxcode) k) |
3450 | fastmap[j] = 1; | |
b18215fc RS |
3451 | |
3452 | if (bufp->multibyte) | |
3453 | /* Any character set can possibly contain a character | |
3454 | whose syntax is not K. */ | |
3455 | goto set_fastmap_for_multibyte_characters; | |
3456 | break; | |
3457 | #endif | |
3458 | ||
3459 | ||
3460 | case categoryspec: | |
3461 | k = *p++; | |
3462 | simple_char_max = bufp->multibyte ? 0x80 : (1 << BYTEWIDTH); | |
3463 | for (j = 0; j < simple_char_max; j++) | |
3464 | if (CHAR_HAS_CATEGORY (j, k)) | |
3465 | fastmap[j] = 1; | |
3466 | ||
3467 | if (bufp->multibyte) | |
3468 | /* Any character set can possibly contain a character | |
3469 | whose category is K. */ | |
3470 | goto set_fastmap_for_multibyte_characters; | |
fa9a63c5 RM |
3471 | break; |
3472 | ||
3473 | ||
b18215fc RS |
3474 | case notcategoryspec: |
3475 | k = *p++; | |
3476 | simple_char_max = bufp->multibyte ? 0x80 : (1 << BYTEWIDTH); | |
3477 | for (j = 0; j < simple_char_max; j++) | |
3478 | if (!CHAR_HAS_CATEGORY (j, k)) | |
3479 | fastmap[j] = 1; | |
3480 | ||
3481 | if (bufp->multibyte) | |
3482 | /* Any character set can possibly contain a character | |
25fe55af | 3483 | whose category is not K. */ |
b18215fc RS |
3484 | goto set_fastmap_for_multibyte_characters; |
3485 | break; | |
3486 | ||
fa9a63c5 | 3487 | /* All cases after this match the empty string. These end with |
25fe55af | 3488 | `continue'. */ |
fa9a63c5 RM |
3489 | |
3490 | ||
3491 | case before_dot: | |
3492 | case at_dot: | |
3493 | case after_dot: | |
25fe55af | 3494 | continue; |
ae4788a8 | 3495 | #endif /* emacs */ |
fa9a63c5 RM |
3496 | |
3497 | ||
25fe55af RS |
3498 | case no_op: |
3499 | case begline: | |
3500 | case endline: | |
fa9a63c5 RM |
3501 | case begbuf: |
3502 | case endbuf: | |
b18215fc | 3503 | #ifndef emacs |
fa9a63c5 RM |
3504 | case wordbound: |
3505 | case notwordbound: | |
3506 | case wordbeg: | |
3507 | case wordend: | |
25fe55af RS |
3508 | #endif |
3509 | case push_dummy_failure: | |
3510 | continue; | |
fa9a63c5 RM |
3511 | |
3512 | ||
3513 | case jump_n: | |
25fe55af | 3514 | case pop_failure_jump: |
fa9a63c5 RM |
3515 | case maybe_pop_jump: |
3516 | case jump: | |
25fe55af | 3517 | case jump_past_alt: |
fa9a63c5 | 3518 | case dummy_failure_jump: |
25fe55af | 3519 | EXTRACT_NUMBER_AND_INCR (j, p); |
5e69f11e | 3520 | p += j; |
fa9a63c5 RM |
3521 | if (j > 0) |
3522 | continue; | |
5e69f11e | 3523 | |
25fe55af RS |
3524 | /* Jump backward implies we just went through the body of a |
3525 | loop and matched nothing. Opcode jumped to should be | |
3526 | `on_failure_jump' or `succeed_n'. Just treat it like an | |
3527 | ordinary jump. For a * loop, it has pushed its failure | |
3528 | point already; if so, discard that as redundant. */ | |
3529 | if ((re_opcode_t) *p != on_failure_jump | |
fa9a63c5 RM |
3530 | && (re_opcode_t) *p != succeed_n) |
3531 | continue; | |
3532 | ||
25fe55af RS |
3533 | p++; |
3534 | EXTRACT_NUMBER_AND_INCR (j, p); | |
3535 | p += j; | |
5e69f11e | 3536 | |
25fe55af RS |
3537 | /* If what's on the stack is where we are now, pop it. */ |
3538 | if (!FAIL_STACK_EMPTY () | |
fa9a63c5 | 3539 | && fail_stack.stack[fail_stack.avail - 1].pointer == p) |
25fe55af | 3540 | fail_stack.avail--; |
fa9a63c5 | 3541 | |
25fe55af | 3542 | continue; |
fa9a63c5 RM |
3543 | |
3544 | ||
25fe55af RS |
3545 | case on_failure_jump: |
3546 | case on_failure_keep_string_jump: | |
fa9a63c5 | 3547 | handle_on_failure_jump: |
25fe55af RS |
3548 | EXTRACT_NUMBER_AND_INCR (j, p); |
3549 | ||
3550 | /* For some patterns, e.g., `(a?)?', `p+j' here points to the | |
3551 | end of the pattern. We don't want to push such a point, | |
3552 | since when we restore it above, entering the switch will | |
3553 | increment `p' past the end of the pattern. We don't need | |
3554 | to push such a point since we obviously won't find any more | |
3555 | fastmap entries beyond `pend'. Such a pattern can match | |
3556 | the null string, though. */ | |
3557 | if (p + j < pend) | |
3558 | { | |
3559 | if (!PUSH_PATTERN_OP (p + j, fail_stack)) | |
fa9a63c5 RM |
3560 | { |
3561 | RESET_FAIL_STACK (); | |
3562 | return -2; | |
3563 | } | |
fa9a63c5 | 3564 | } |
25fe55af RS |
3565 | else |
3566 | bufp->can_be_null = 1; | |
fa9a63c5 | 3567 | |
25fe55af RS |
3568 | if (succeed_n_p) |
3569 | { | |
3570 | EXTRACT_NUMBER_AND_INCR (k, p); /* Skip the n. */ | |
3571 | succeed_n_p = false; | |
3572 | } | |
3573 | ||
3574 | continue; | |
fa9a63c5 RM |
3575 | |
3576 | ||
3577 | case succeed_n: | |
25fe55af RS |
3578 | /* Get to the number of times to succeed. */ |
3579 | p += 2; | |
fa9a63c5 | 3580 | |
25fe55af RS |
3581 | /* Increment p past the n for when k != 0. */ |
3582 | EXTRACT_NUMBER_AND_INCR (k, p); | |
3583 | if (k == 0) | |
fa9a63c5 | 3584 | { |
25fe55af RS |
3585 | p -= 4; |
3586 | succeed_n_p = true; /* Spaghetti code alert. */ | |
3587 | goto handle_on_failure_jump; | |
3588 | } | |
3589 | continue; | |
fa9a63c5 RM |
3590 | |
3591 | ||
3592 | case set_number_at: | |
25fe55af RS |
3593 | p += 4; |
3594 | continue; | |
fa9a63c5 RM |
3595 | |
3596 | ||
3597 | case start_memory: | |
25fe55af | 3598 | case stop_memory: |
fa9a63c5 RM |
3599 | p += 2; |
3600 | continue; | |
3601 | ||
3602 | ||
3603 | default: | |
25fe55af RS |
3604 | abort (); /* We have listed all the cases. */ |
3605 | } /* switch *p++ */ | |
fa9a63c5 RM |
3606 | |
3607 | /* Getting here means we have found the possible starting | |
25fe55af RS |
3608 | characters for one path of the pattern -- and that the empty |
3609 | string does not match. We need not follow this path further. | |
3610 | Instead, look at the next alternative (remembered on the | |
3611 | stack), or quit if no more. The test at the top of the loop | |
3612 | does these things. */ | |
fa9a63c5 RM |
3613 | path_can_be_null = false; |
3614 | p = pend; | |
3615 | } /* while p */ | |
3616 | ||
3617 | /* Set `can_be_null' for the last path (also the first path, if the | |
25fe55af | 3618 | pattern is empty). */ |
fa9a63c5 RM |
3619 | bufp->can_be_null |= path_can_be_null; |
3620 | ||
3621 | done: | |
3622 | RESET_FAIL_STACK (); | |
3623 | return 0; | |
3624 | } /* re_compile_fastmap */ | |
3625 | \f | |
3626 | /* Set REGS to hold NUM_REGS registers, storing them in STARTS and | |
3627 | ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use | |
3628 | this memory for recording register information. STARTS and ENDS | |
3629 | must be allocated using the malloc library routine, and must each | |
3630 | be at least NUM_REGS * sizeof (regoff_t) bytes long. | |
3631 | ||
3632 | If NUM_REGS == 0, then subsequent matches should allocate their own | |
3633 | register data. | |
3634 | ||
3635 | Unless this function is called, the first search or match using | |
3636 | PATTERN_BUFFER will allocate its own register data, without | |
3637 | freeing the old data. */ | |
3638 | ||
3639 | void | |
3640 | re_set_registers (bufp, regs, num_regs, starts, ends) | |
3641 | struct re_pattern_buffer *bufp; | |
3642 | struct re_registers *regs; | |
3643 | unsigned num_regs; | |
3644 | regoff_t *starts, *ends; | |
3645 | { | |
3646 | if (num_regs) | |
3647 | { | |
3648 | bufp->regs_allocated = REGS_REALLOCATE; | |
3649 | regs->num_regs = num_regs; | |
3650 | regs->start = starts; | |
3651 | regs->end = ends; | |
3652 | } | |
3653 | else | |
3654 | { | |
3655 | bufp->regs_allocated = REGS_UNALLOCATED; | |
3656 | regs->num_regs = 0; | |
3657 | regs->start = regs->end = (regoff_t *) 0; | |
3658 | } | |
3659 | } | |
3660 | \f | |
25fe55af | 3661 | /* Searching routines. */ |
fa9a63c5 RM |
3662 | |
3663 | /* Like re_search_2, below, but only one string is specified, and | |
3664 | doesn't let you say where to stop matching. */ | |
3665 | ||
3666 | int | |
3667 | re_search (bufp, string, size, startpos, range, regs) | |
3668 | struct re_pattern_buffer *bufp; | |
3669 | const char *string; | |
3670 | int size, startpos, range; | |
3671 | struct re_registers *regs; | |
3672 | { | |
5e69f11e | 3673 | return re_search_2 (bufp, NULL, 0, string, size, startpos, range, |
fa9a63c5 RM |
3674 | regs, size); |
3675 | } | |
3676 | ||
b18215fc RS |
3677 | /* End address of virtual concatenation of string. */ |
3678 | #define STOP_ADDR_VSTRING(P) \ | |
3679 | (((P) >= size1 ? string2 + size2 : string1 + size1)) | |
3680 | ||
3681 | /* Address of POS in the concatenation of virtual string. */ | |
3682 | #define POS_ADDR_VSTRING(POS) \ | |
3683 | (((POS) >= size1 ? string2 - size1 : string1) + (POS)) | |
fa9a63c5 RM |
3684 | |
3685 | /* Using the compiled pattern in BUFP->buffer, first tries to match the | |
3686 | virtual concatenation of STRING1 and STRING2, starting first at index | |
3687 | STARTPOS, then at STARTPOS + 1, and so on. | |
5e69f11e | 3688 | |
fa9a63c5 | 3689 | STRING1 and STRING2 have length SIZE1 and SIZE2, respectively. |
5e69f11e | 3690 | |
fa9a63c5 RM |
3691 | RANGE is how far to scan while trying to match. RANGE = 0 means try |
3692 | only at STARTPOS; in general, the last start tried is STARTPOS + | |
3693 | RANGE. | |
5e69f11e | 3694 | |
fa9a63c5 RM |
3695 | In REGS, return the indices of the virtual concatenation of STRING1 |
3696 | and STRING2 that matched the entire BUFP->buffer and its contained | |
3697 | subexpressions. | |
5e69f11e | 3698 | |
fa9a63c5 RM |
3699 | Do not consider matching one past the index STOP in the virtual |
3700 | concatenation of STRING1 and STRING2. | |
3701 | ||
3702 | We return either the position in the strings at which the match was | |
3703 | found, -1 if no match, or -2 if error (such as failure | |
3704 | stack overflow). */ | |
3705 | ||
3706 | int | |
3707 | re_search_2 (bufp, string1, size1, string2, size2, startpos, range, regs, stop) | |
3708 | struct re_pattern_buffer *bufp; | |
3709 | const char *string1, *string2; | |
3710 | int size1, size2; | |
3711 | int startpos; | |
3712 | int range; | |
3713 | struct re_registers *regs; | |
3714 | int stop; | |
3715 | { | |
3716 | int val; | |
3717 | register char *fastmap = bufp->fastmap; | |
6676cb1c | 3718 | register RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 RM |
3719 | int total_size = size1 + size2; |
3720 | int endpos = startpos + range; | |
c8499ba5 | 3721 | int anchored_start = 0; |
fa9a63c5 | 3722 | |
25fe55af | 3723 | /* Nonzero if we have to concern multibyte character. */ |
b18215fc RS |
3724 | int multibyte = bufp->multibyte; |
3725 | ||
fa9a63c5 RM |
3726 | /* Check for out-of-range STARTPOS. */ |
3727 | if (startpos < 0 || startpos > total_size) | |
3728 | return -1; | |
5e69f11e | 3729 | |
fa9a63c5 | 3730 | /* Fix up RANGE if it might eventually take us outside |
34597fa9 | 3731 | the virtual concatenation of STRING1 and STRING2. |
5e69f11e | 3732 | Make sure we won't move STARTPOS below 0 or above TOTAL_SIZE. */ |
34597fa9 RS |
3733 | if (endpos < 0) |
3734 | range = 0 - startpos; | |
fa9a63c5 RM |
3735 | else if (endpos > total_size) |
3736 | range = total_size - startpos; | |
3737 | ||
3738 | /* If the search isn't to be a backwards one, don't waste time in a | |
3739 | search for a pattern that must be anchored. */ | |
3740 | if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == begbuf && range > 0) | |
3741 | { | |
3742 | if (startpos > 0) | |
3743 | return -1; | |
3744 | else | |
3745 | range = 1; | |
3746 | } | |
3747 | ||
ae4788a8 RS |
3748 | #ifdef emacs |
3749 | /* In a forward search for something that starts with \=. | |
3750 | don't keep searching past point. */ | |
3751 | if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == at_dot && range > 0) | |
3752 | { | |
3753 | range = PT - startpos; | |
3754 | if (range <= 0) | |
3755 | return -1; | |
3756 | } | |
3757 | #endif /* emacs */ | |
3758 | ||
fa9a63c5 RM |
3759 | /* Update the fastmap now if not correct already. */ |
3760 | if (fastmap && !bufp->fastmap_accurate) | |
3761 | if (re_compile_fastmap (bufp) == -2) | |
3762 | return -2; | |
5e69f11e | 3763 | |
c8499ba5 RS |
3764 | /* See whether the pattern is anchored. */ |
3765 | if (bufp->buffer[0] == begline) | |
3766 | anchored_start = 1; | |
3767 | ||
b18215fc RS |
3768 | #ifdef emacs |
3769 | SETUP_SYNTAX_TABLE_FOR_OBJECT (re_match_object, | |
25fe55af | 3770 | POS_AS_IN_BUFFER (startpos > 0 |
b18215fc RS |
3771 | ? startpos - 1 : startpos), |
3772 | 1); | |
3773 | #endif | |
3774 | ||
fa9a63c5 RM |
3775 | /* Loop through the string, looking for a place to start matching. */ |
3776 | for (;;) | |
5e69f11e | 3777 | { |
c8499ba5 RS |
3778 | /* If the pattern is anchored, |
3779 | skip quickly past places we cannot match. | |
3780 | We don't bother to treat startpos == 0 specially | |
3781 | because that case doesn't repeat. */ | |
3782 | if (anchored_start && startpos > 0) | |
3783 | { | |
3784 | if (! (bufp->newline_anchor | |
3785 | && ((startpos <= size1 ? string1[startpos - 1] | |
3786 | : string2[startpos - size1 - 1]) | |
3787 | == '\n'))) | |
3788 | goto advance; | |
3789 | } | |
3790 | ||
fa9a63c5 | 3791 | /* If a fastmap is supplied, skip quickly over characters that |
25fe55af RS |
3792 | cannot be the start of a match. If the pattern can match the |
3793 | null string, however, we don't need to skip characters; we want | |
3794 | the first null string. */ | |
fa9a63c5 RM |
3795 | if (fastmap && startpos < total_size && !bufp->can_be_null) |
3796 | { | |
25fe55af | 3797 | if (range > 0) /* Searching forwards. */ |
fa9a63c5 RM |
3798 | { |
3799 | register const char *d; | |
3800 | register int lim = 0; | |
3801 | int irange = range; | |
3802 | ||
25fe55af RS |
3803 | if (startpos < size1 && startpos + range >= size1) |
3804 | lim = range - (size1 - startpos); | |
fa9a63c5 | 3805 | |
b18215fc | 3806 | d = POS_ADDR_VSTRING (startpos); |
5e69f11e | 3807 | |
25fe55af RS |
3808 | /* Written out as an if-else to avoid testing `translate' |
3809 | inside the loop. */ | |
fa9a63c5 | 3810 | if (translate) |
25fe55af RS |
3811 | while (range > lim |
3812 | && !fastmap[(unsigned char) | |
bc192b5b | 3813 | RE_TRANSLATE (translate, (unsigned char) *d++)]) |
25fe55af | 3814 | range--; |
fa9a63c5 | 3815 | else |
25fe55af RS |
3816 | while (range > lim && !fastmap[(unsigned char) *d++]) |
3817 | range--; | |
fa9a63c5 RM |
3818 | |
3819 | startpos += irange - range; | |
3820 | } | |
25fe55af | 3821 | else /* Searching backwards. */ |
fa9a63c5 RM |
3822 | { |
3823 | register char c = (size1 == 0 || startpos >= size1 | |
25fe55af RS |
3824 | ? string2[startpos - size1] |
3825 | : string1[startpos]); | |
fa9a63c5 RM |
3826 | |
3827 | if (!fastmap[(unsigned char) TRANSLATE (c)]) | |
3828 | goto advance; | |
3829 | } | |
3830 | } | |
3831 | ||
3832 | /* If can't match the null string, and that's all we have left, fail. */ | |
3833 | if (range >= 0 && startpos == total_size && fastmap | |
25fe55af | 3834 | && !bufp->can_be_null) |
fa9a63c5 RM |
3835 | return -1; |
3836 | ||
3837 | val = re_match_2_internal (bufp, string1, size1, string2, size2, | |
3838 | startpos, regs, stop); | |
3839 | #ifndef REGEX_MALLOC | |
3840 | #ifdef C_ALLOCA | |
3841 | alloca (0); | |
3842 | #endif | |
3843 | #endif | |
3844 | ||
3845 | if (val >= 0) | |
3846 | return startpos; | |
5e69f11e | 3847 | |
fa9a63c5 RM |
3848 | if (val == -2) |
3849 | return -2; | |
3850 | ||
3851 | advance: | |
5e69f11e | 3852 | if (!range) |
25fe55af | 3853 | break; |
5e69f11e | 3854 | else if (range > 0) |
25fe55af | 3855 | { |
b18215fc RS |
3856 | /* Update STARTPOS to the next character boundary. */ |
3857 | if (multibyte) | |
3858 | { | |
b560c397 RS |
3859 | const unsigned char *p |
3860 | = (const unsigned char *) POS_ADDR_VSTRING (startpos); | |
3861 | const unsigned char *pend | |
3862 | = (const unsigned char *) STOP_ADDR_VSTRING (startpos); | |
b18215fc RS |
3863 | int len = MULTIBYTE_FORM_LENGTH (p, pend - p); |
3864 | ||
3865 | range -= len; | |
3866 | if (range < 0) | |
3867 | break; | |
3868 | startpos += len; | |
3869 | } | |
3870 | else | |
3871 | { | |
b560c397 RS |
3872 | range--; |
3873 | startpos++; | |
3874 | } | |
e318085a | 3875 | } |
fa9a63c5 | 3876 | else |
25fe55af RS |
3877 | { |
3878 | range++; | |
3879 | startpos--; | |
b18215fc RS |
3880 | |
3881 | /* Update STARTPOS to the previous character boundary. */ | |
3882 | if (multibyte) | |
3883 | { | |
b560c397 RS |
3884 | const unsigned char *p |
3885 | = (const unsigned char *) POS_ADDR_VSTRING (startpos); | |
b18215fc RS |
3886 | int len = 0; |
3887 | ||
3888 | /* Find the head of multibyte form. */ | |
3889 | while (!CHAR_HEAD_P (p)) | |
3890 | p--, len++; | |
3891 | ||
3892 | /* Adjust it. */ | |
3893 | #if 0 /* XXX */ | |
3894 | if (MULTIBYTE_FORM_LENGTH (p, len + 1) != (len + 1)) | |
3895 | ; | |
3896 | else | |
3897 | #endif | |
3898 | { | |
3899 | range += len; | |
3900 | if (range > 0) | |
3901 | break; | |
3902 | ||
3903 | startpos -= len; | |
3904 | } | |
3905 | } | |
25fe55af | 3906 | } |
fa9a63c5 RM |
3907 | } |
3908 | return -1; | |
3909 | } /* re_search_2 */ | |
3910 | \f | |
3911 | /* Declarations and macros for re_match_2. */ | |
3912 | ||
3913 | static int bcmp_translate (); | |
3914 | static boolean alt_match_null_string_p (), | |
25fe55af RS |
3915 | common_op_match_null_string_p (), |
3916 | group_match_null_string_p (); | |
fa9a63c5 RM |
3917 | |
3918 | /* This converts PTR, a pointer into one of the search strings `string1' | |
3919 | and `string2' into an offset from the beginning of that string. */ | |
3920 | #define POINTER_TO_OFFSET(ptr) \ | |
3921 | (FIRST_STRING_P (ptr) \ | |
3922 | ? ((regoff_t) ((ptr) - string1)) \ | |
3923 | : ((regoff_t) ((ptr) - string2 + size1))) | |
3924 | ||
3925 | /* Macros for dealing with the split strings in re_match_2. */ | |
3926 | ||
3927 | #define MATCHING_IN_FIRST_STRING (dend == end_match_1) | |
3928 | ||
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); \ | |
3984 | FREE_VAR (old_regstart); \ | |
3985 | FREE_VAR (old_regend); \ | |
3986 | FREE_VAR (best_regstart); \ | |
3987 | FREE_VAR (best_regend); \ | |
3988 | FREE_VAR (reg_info); \ | |
3989 | FREE_VAR (reg_dummy); \ | |
3990 | FREE_VAR (reg_info_dummy); \ | |
3991 | } while (0) | |
3992 | #else | |
3993 | #define FREE_VARIABLES() ((void)0) /* Do nothing! But inhibit gcc warning. */ | |
3994 | #endif /* not MATCH_MAY_ALLOCATE */ | |
3995 | ||
25fe55af | 3996 | /* These values must meet several constraints. They must not be valid |
fa9a63c5 RM |
3997 | register values; since we have a limit of 255 registers (because |
3998 | we use only one byte in the pattern for the register number), we can | |
25fe55af | 3999 | use numbers larger than 255. They must differ by 1, because of |
fa9a63c5 RM |
4000 | NUM_FAILURE_ITEMS above. And the value for the lowest register must |
4001 | be larger than the value for the highest register, so we do not try | |
25fe55af | 4002 | to actually save any registers when none are active. */ |
fa9a63c5 RM |
4003 | #define NO_HIGHEST_ACTIVE_REG (1 << BYTEWIDTH) |
4004 | #define NO_LOWEST_ACTIVE_REG (NO_HIGHEST_ACTIVE_REG + 1) | |
4005 | \f | |
4006 | /* Matching routines. */ | |
4007 | ||
25fe55af | 4008 | #ifndef emacs /* Emacs never uses this. */ |
fa9a63c5 RM |
4009 | /* re_match is like re_match_2 except it takes only a single string. */ |
4010 | ||
4011 | int | |
4012 | re_match (bufp, string, size, pos, regs) | |
4013 | struct re_pattern_buffer *bufp; | |
4014 | const char *string; | |
4015 | int size, pos; | |
4016 | struct re_registers *regs; | |
4017 | { | |
4018 | int result = re_match_2_internal (bufp, NULL, 0, string, size, | |
4019 | pos, regs, size); | |
4020 | alloca (0); | |
4021 | return result; | |
4022 | } | |
4023 | #endif /* not emacs */ | |
4024 | ||
b18215fc RS |
4025 | #ifdef emacs |
4026 | /* In Emacs, this is the string or buffer in which we | |
25fe55af | 4027 | are matching. It is used for looking up syntax properties. */ |
b18215fc RS |
4028 | Lisp_Object re_match_object; |
4029 | #endif | |
fa9a63c5 RM |
4030 | |
4031 | /* re_match_2 matches the compiled pattern in BUFP against the | |
4032 | the (virtual) concatenation of STRING1 and STRING2 (of length SIZE1 | |
4033 | and SIZE2, respectively). We start matching at POS, and stop | |
4034 | matching at STOP. | |
5e69f11e | 4035 | |
fa9a63c5 | 4036 | If REGS is non-null and the `no_sub' field of BUFP is nonzero, we |
25fe55af | 4037 | store offsets for the substring each group matched in REGS. See the |
fa9a63c5 RM |
4038 | documentation for exactly how many groups we fill. |
4039 | ||
4040 | We return -1 if no match, -2 if an internal error (such as the | |
25fe55af | 4041 | failure stack overflowing). Otherwise, we return the length of the |
fa9a63c5 RM |
4042 | matched substring. */ |
4043 | ||
4044 | int | |
4045 | re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop) | |
4046 | struct re_pattern_buffer *bufp; | |
4047 | const char *string1, *string2; | |
4048 | int size1, size2; | |
4049 | int pos; | |
4050 | struct re_registers *regs; | |
4051 | int stop; | |
4052 | { | |
b18215fc | 4053 | int result; |
25fe55af | 4054 | |
b18215fc | 4055 | #ifdef emacs |
25fe55af RS |
4056 | SETUP_SYNTAX_TABLE_FOR_OBJECT (re_match_object, |
4057 | POS_AS_IN_BUFFER (pos > 0 ? pos - 1 : pos), | |
b18215fc RS |
4058 | 1); |
4059 | #endif | |
4060 | ||
4061 | result = re_match_2_internal (bufp, string1, size1, string2, size2, | |
fa9a63c5 RM |
4062 | pos, regs, stop); |
4063 | alloca (0); | |
4064 | return result; | |
4065 | } | |
4066 | ||
4067 | /* This is a separate function so that we can force an alloca cleanup | |
25fe55af | 4068 | afterwards. */ |
fa9a63c5 RM |
4069 | static int |
4070 | re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop) | |
4071 | struct re_pattern_buffer *bufp; | |
4072 | const char *string1, *string2; | |
4073 | int size1, size2; | |
4074 | int pos; | |
4075 | struct re_registers *regs; | |
4076 | int stop; | |
4077 | { | |
4078 | /* General temporaries. */ | |
4079 | int mcnt; | |
4080 | unsigned char *p1; | |
4081 | ||
4082 | /* Just past the end of the corresponding string. */ | |
4083 | const char *end1, *end2; | |
4084 | ||
4085 | /* Pointers into string1 and string2, just past the last characters in | |
25fe55af | 4086 | each to consider matching. */ |
fa9a63c5 RM |
4087 | const char *end_match_1, *end_match_2; |
4088 | ||
4089 | /* Where we are in the data, and the end of the current string. */ | |
4090 | const char *d, *dend; | |
5e69f11e | 4091 | |
fa9a63c5 RM |
4092 | /* Where we are in the pattern, and the end of the pattern. */ |
4093 | unsigned char *p = bufp->buffer; | |
4094 | register unsigned char *pend = p + bufp->used; | |
4095 | ||
4096 | /* Mark the opcode just after a start_memory, so we can test for an | |
4097 | empty subpattern when we get to the stop_memory. */ | |
4098 | unsigned char *just_past_start_mem = 0; | |
4099 | ||
25fe55af | 4100 | /* We use this to map every character in the string. */ |
6676cb1c | 4101 | RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 | 4102 | |
25fe55af | 4103 | /* Nonzero if we have to concern multibyte character. */ |
b18215fc RS |
4104 | int multibyte = bufp->multibyte; |
4105 | ||
fa9a63c5 RM |
4106 | /* Failure point stack. Each place that can handle a failure further |
4107 | down the line pushes a failure point on this stack. It consists of | |
4108 | restart, regend, and reg_info for all registers corresponding to | |
4109 | the subexpressions we're currently inside, plus the number of such | |
4110 | registers, and, finally, two char *'s. The first char * is where | |
4111 | to resume scanning the pattern; the second one is where to resume | |
4112 | scanning the strings. If the latter is zero, the failure point is | |
4113 | a ``dummy''; if a failure happens and the failure point is a dummy, | |
25fe55af RS |
4114 | it gets discarded and the next next one is tried. */ |
4115 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global. */ | |
fa9a63c5 RM |
4116 | fail_stack_type fail_stack; |
4117 | #endif | |
4118 | #ifdef DEBUG | |
4119 | static unsigned failure_id = 0; | |
4120 | unsigned nfailure_points_pushed = 0, nfailure_points_popped = 0; | |
4121 | #endif | |
4122 | ||
4123 | /* This holds the pointer to the failure stack, when | |
4124 | it is allocated relocatably. */ | |
4125 | fail_stack_elt_t *failure_stack_ptr; | |
4126 | ||
4127 | /* We fill all the registers internally, independent of what we | |
25fe55af | 4128 | return, for use in backreferences. The number here includes |
fa9a63c5 RM |
4129 | an element for register zero. */ |
4130 | unsigned num_regs = bufp->re_nsub + 1; | |
5e69f11e | 4131 | |
fa9a63c5 RM |
4132 | /* The currently active registers. */ |
4133 | unsigned lowest_active_reg = NO_LOWEST_ACTIVE_REG; | |
4134 | unsigned highest_active_reg = NO_HIGHEST_ACTIVE_REG; | |
4135 | ||
4136 | /* Information on the contents of registers. These are pointers into | |
4137 | the input strings; they record just what was matched (on this | |
4138 | attempt) by a subexpression part of the pattern, that is, the | |
4139 | regnum-th regstart pointer points to where in the pattern we began | |
4140 | matching and the regnum-th regend points to right after where we | |
4141 | stopped matching the regnum-th subexpression. (The zeroth register | |
4142 | keeps track of what the whole pattern matches.) */ | |
4143 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
4144 | const char **regstart, **regend; | |
4145 | #endif | |
4146 | ||
4147 | /* If a group that's operated upon by a repetition operator fails to | |
4148 | match anything, then the register for its start will need to be | |
4149 | restored because it will have been set to wherever in the string we | |
4150 | are when we last see its open-group operator. Similarly for a | |
4151 | register's end. */ | |
4152 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
4153 | const char **old_regstart, **old_regend; | |
4154 | #endif | |
4155 | ||
4156 | /* The is_active field of reg_info helps us keep track of which (possibly | |
4157 | nested) subexpressions we are currently in. The matched_something | |
4158 | field of reg_info[reg_num] helps us tell whether or not we have | |
4159 | matched any of the pattern so far this time through the reg_num-th | |
4160 | subexpression. These two fields get reset each time through any | |
25fe55af RS |
4161 | loop their register is in. */ |
4162 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global. */ | |
5e69f11e | 4163 | register_info_type *reg_info; |
fa9a63c5 RM |
4164 | #endif |
4165 | ||
4166 | /* The following record the register info as found in the above | |
5e69f11e | 4167 | variables when we find a match better than any we've seen before. |
fa9a63c5 RM |
4168 | This happens as we backtrack through the failure points, which in |
4169 | turn happens only if we have not yet matched the entire string. */ | |
4170 | unsigned best_regs_set = false; | |
4171 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
4172 | const char **best_regstart, **best_regend; | |
4173 | #endif | |
5e69f11e | 4174 | |
fa9a63c5 RM |
4175 | /* Logically, this is `best_regend[0]'. But we don't want to have to |
4176 | allocate space for that if we're not allocating space for anything | |
25fe55af | 4177 | else (see below). Also, we never need info about register 0 for |
fa9a63c5 RM |
4178 | any of the other register vectors, and it seems rather a kludge to |
4179 | treat `best_regend' differently than the rest. So we keep track of | |
4180 | the end of the best match so far in a separate variable. We | |
4181 | initialize this to NULL so that when we backtrack the first time | |
4182 | and need to test it, it's not garbage. */ | |
4183 | const char *match_end = NULL; | |
4184 | ||
4185 | /* This helps SET_REGS_MATCHED avoid doing redundant work. */ | |
4186 | int set_regs_matched_done = 0; | |
4187 | ||
4188 | /* Used when we pop values we don't care about. */ | |
4189 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
4190 | const char **reg_dummy; | |
4191 | register_info_type *reg_info_dummy; | |
4192 | #endif | |
4193 | ||
4194 | #ifdef DEBUG | |
4195 | /* Counts the total number of registers pushed. */ | |
5e69f11e | 4196 | unsigned num_regs_pushed = 0; |
fa9a63c5 RM |
4197 | #endif |
4198 | ||
4199 | DEBUG_PRINT1 ("\n\nEntering re_match_2.\n"); | |
5e69f11e | 4200 | |
fa9a63c5 | 4201 | INIT_FAIL_STACK (); |
5e69f11e | 4202 | |
fa9a63c5 RM |
4203 | #ifdef MATCH_MAY_ALLOCATE |
4204 | /* Do not bother to initialize all the register variables if there are | |
4205 | no groups in the pattern, as it takes a fair amount of time. If | |
4206 | there are groups, we include space for register 0 (the whole | |
4207 | pattern), even though we never use it, since it simplifies the | |
4208 | array indexing. We should fix this. */ | |
4209 | if (bufp->re_nsub) | |
4210 | { | |
4211 | regstart = REGEX_TALLOC (num_regs, const char *); | |
4212 | regend = REGEX_TALLOC (num_regs, const char *); | |
4213 | old_regstart = REGEX_TALLOC (num_regs, const char *); | |
4214 | old_regend = REGEX_TALLOC (num_regs, const char *); | |
4215 | best_regstart = REGEX_TALLOC (num_regs, const char *); | |
4216 | best_regend = REGEX_TALLOC (num_regs, const char *); | |
4217 | reg_info = REGEX_TALLOC (num_regs, register_info_type); | |
4218 | reg_dummy = REGEX_TALLOC (num_regs, const char *); | |
4219 | reg_info_dummy = REGEX_TALLOC (num_regs, register_info_type); | |
4220 | ||
5e69f11e | 4221 | if (!(regstart && regend && old_regstart && old_regend && reg_info |
25fe55af RS |
4222 | && best_regstart && best_regend && reg_dummy && reg_info_dummy)) |
4223 | { | |
4224 | FREE_VARIABLES (); | |
4225 | return -2; | |
4226 | } | |
fa9a63c5 RM |
4227 | } |
4228 | else | |
4229 | { | |
4230 | /* We must initialize all our variables to NULL, so that | |
25fe55af | 4231 | `FREE_VARIABLES' doesn't try to free them. */ |
fa9a63c5 | 4232 | regstart = regend = old_regstart = old_regend = best_regstart |
25fe55af | 4233 | = best_regend = reg_dummy = NULL; |
fa9a63c5 RM |
4234 | reg_info = reg_info_dummy = (register_info_type *) NULL; |
4235 | } | |
4236 | #endif /* MATCH_MAY_ALLOCATE */ | |
4237 | ||
4238 | /* The starting position is bogus. */ | |
4239 | if (pos < 0 || pos > size1 + size2) | |
4240 | { | |
4241 | FREE_VARIABLES (); | |
4242 | return -1; | |
4243 | } | |
5e69f11e | 4244 | |
fa9a63c5 RM |
4245 | /* Initialize subexpression text positions to -1 to mark ones that no |
4246 | start_memory/stop_memory has been seen for. Also initialize the | |
4247 | register information struct. */ | |
4248 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
4249 | { | |
5e69f11e | 4250 | regstart[mcnt] = regend[mcnt] |
25fe55af | 4251 | = old_regstart[mcnt] = old_regend[mcnt] = REG_UNSET_VALUE; |
5e69f11e | 4252 | |
fa9a63c5 RM |
4253 | REG_MATCH_NULL_STRING_P (reg_info[mcnt]) = MATCH_NULL_UNSET_VALUE; |
4254 | IS_ACTIVE (reg_info[mcnt]) = 0; | |
4255 | MATCHED_SOMETHING (reg_info[mcnt]) = 0; | |
4256 | EVER_MATCHED_SOMETHING (reg_info[mcnt]) = 0; | |
4257 | } | |
5e69f11e | 4258 | |
fa9a63c5 | 4259 | /* We move `string1' into `string2' if the latter's empty -- but not if |
25fe55af | 4260 | `string1' is null. */ |
fa9a63c5 RM |
4261 | if (size2 == 0 && string1 != NULL) |
4262 | { | |
4263 | string2 = string1; | |
4264 | size2 = size1; | |
4265 | string1 = 0; | |
4266 | size1 = 0; | |
4267 | } | |
4268 | end1 = string1 + size1; | |
4269 | end2 = string2 + size2; | |
4270 | ||
4271 | /* Compute where to stop matching, within the two strings. */ | |
4272 | if (stop <= size1) | |
4273 | { | |
4274 | end_match_1 = string1 + stop; | |
4275 | end_match_2 = string2; | |
4276 | } | |
4277 | else | |
4278 | { | |
4279 | end_match_1 = end1; | |
4280 | end_match_2 = string2 + stop - size1; | |
4281 | } | |
4282 | ||
5e69f11e | 4283 | /* `p' scans through the pattern as `d' scans through the data. |
fa9a63c5 RM |
4284 | `dend' is the end of the input string that `d' points within. `d' |
4285 | is advanced into the following input string whenever necessary, but | |
4286 | this happens before fetching; therefore, at the beginning of the | |
4287 | loop, `d' can be pointing at the end of a string, but it cannot | |
4288 | equal `string2'. */ | |
4289 | if (size1 > 0 && pos <= size1) | |
4290 | { | |
4291 | d = string1 + pos; | |
4292 | dend = end_match_1; | |
4293 | } | |
4294 | else | |
4295 | { | |
4296 | d = string2 + pos - size1; | |
4297 | dend = end_match_2; | |
4298 | } | |
4299 | ||
4300 | DEBUG_PRINT1 ("The compiled pattern is: "); | |
4301 | DEBUG_PRINT_COMPILED_PATTERN (bufp, p, pend); | |
4302 | DEBUG_PRINT1 ("The string to match is: `"); | |
4303 | DEBUG_PRINT_DOUBLE_STRING (d, string1, size1, string2, size2); | |
4304 | DEBUG_PRINT1 ("'\n"); | |
5e69f11e | 4305 | |
25fe55af | 4306 | /* This loops over pattern commands. It exits by returning from the |
fa9a63c5 RM |
4307 | function if the match is complete, or it drops through if the match |
4308 | fails at this starting point in the input data. */ | |
4309 | for (;;) | |
4310 | { | |
4311 | DEBUG_PRINT2 ("\n0x%x: ", p); | |
4312 | ||
4313 | if (p == pend) | |
4314 | { /* End of pattern means we might have succeeded. */ | |
25fe55af | 4315 | DEBUG_PRINT1 ("end of pattern ... "); |
5e69f11e | 4316 | |
fa9a63c5 | 4317 | /* If we haven't matched the entire string, and we want the |
25fe55af RS |
4318 | longest match, try backtracking. */ |
4319 | if (d != end_match_2) | |
fa9a63c5 RM |
4320 | { |
4321 | /* 1 if this match ends in the same string (string1 or string2) | |
4322 | as the best previous match. */ | |
5e69f11e | 4323 | boolean same_str_p = (FIRST_STRING_P (match_end) |
fa9a63c5 RM |
4324 | == MATCHING_IN_FIRST_STRING); |
4325 | /* 1 if this match is the best seen so far. */ | |
4326 | boolean best_match_p; | |
4327 | ||
4328 | /* AIX compiler got confused when this was combined | |
25fe55af | 4329 | with the previous declaration. */ |
fa9a63c5 RM |
4330 | if (same_str_p) |
4331 | best_match_p = d > match_end; | |
4332 | else | |
4333 | best_match_p = !MATCHING_IN_FIRST_STRING; | |
4334 | ||
25fe55af RS |
4335 | DEBUG_PRINT1 ("backtracking.\n"); |
4336 | ||
4337 | if (!FAIL_STACK_EMPTY ()) | |
4338 | { /* More failure points to try. */ | |
4339 | ||
4340 | /* If exceeds best match so far, save it. */ | |
4341 | if (!best_regs_set || best_match_p) | |
4342 | { | |
4343 | best_regs_set = true; | |
4344 | match_end = d; | |
4345 | ||
4346 | DEBUG_PRINT1 ("\nSAVING match as best so far.\n"); | |
4347 | ||
4348 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
4349 | { | |
4350 | best_regstart[mcnt] = regstart[mcnt]; | |
4351 | best_regend[mcnt] = regend[mcnt]; | |
4352 | } | |
4353 | } | |
4354 | goto fail; | |
4355 | } | |
4356 | ||
4357 | /* If no failure points, don't restore garbage. And if | |
4358 | last match is real best match, don't restore second | |
4359 | best one. */ | |
4360 | else if (best_regs_set && !best_match_p) | |
4361 | { | |
4362 | restore_best_regs: | |
4363 | /* Restore best match. It may happen that `dend == | |
4364 | end_match_1' while the restored d is in string2. | |
4365 | For example, the pattern `x.*y.*z' against the | |
4366 | strings `x-' and `y-z-', if the two strings are | |
4367 | not consecutive in memory. */ | |
4368 | DEBUG_PRINT1 ("Restoring best registers.\n"); | |
4369 | ||
4370 | d = match_end; | |
4371 | dend = ((d >= string1 && d <= end1) | |
4372 | ? end_match_1 : end_match_2); | |
fa9a63c5 RM |
4373 | |
4374 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
4375 | { | |
4376 | regstart[mcnt] = best_regstart[mcnt]; | |
4377 | regend[mcnt] = best_regend[mcnt]; | |
4378 | } | |
25fe55af RS |
4379 | } |
4380 | } /* d != end_match_2 */ | |
fa9a63c5 RM |
4381 | |
4382 | succeed_label: | |
25fe55af | 4383 | DEBUG_PRINT1 ("Accepting match.\n"); |
fa9a63c5 | 4384 | |
25fe55af RS |
4385 | /* If caller wants register contents data back, do it. */ |
4386 | if (regs && !bufp->no_sub) | |
fa9a63c5 | 4387 | { |
25fe55af RS |
4388 | /* Have the register data arrays been allocated? */ |
4389 | if (bufp->regs_allocated == REGS_UNALLOCATED) | |
4390 | { /* No. So allocate them with malloc. We need one | |
4391 | extra element beyond `num_regs' for the `-1' marker | |
4392 | GNU code uses. */ | |
4393 | regs->num_regs = MAX (RE_NREGS, num_regs + 1); | |
4394 | regs->start = TALLOC (regs->num_regs, regoff_t); | |
4395 | regs->end = TALLOC (regs->num_regs, regoff_t); | |
4396 | if (regs->start == NULL || regs->end == NULL) | |
fa9a63c5 RM |
4397 | { |
4398 | FREE_VARIABLES (); | |
4399 | return -2; | |
4400 | } | |
25fe55af RS |
4401 | bufp->regs_allocated = REGS_REALLOCATE; |
4402 | } | |
4403 | else if (bufp->regs_allocated == REGS_REALLOCATE) | |
4404 | { /* Yes. If we need more elements than were already | |
4405 | allocated, reallocate them. If we need fewer, just | |
4406 | leave it alone. */ | |
4407 | if (regs->num_regs < num_regs + 1) | |
4408 | { | |
4409 | regs->num_regs = num_regs + 1; | |
4410 | RETALLOC (regs->start, regs->num_regs, regoff_t); | |
4411 | RETALLOC (regs->end, regs->num_regs, regoff_t); | |
4412 | if (regs->start == NULL || regs->end == NULL) | |
fa9a63c5 RM |
4413 | { |
4414 | FREE_VARIABLES (); | |
4415 | return -2; | |
4416 | } | |
25fe55af RS |
4417 | } |
4418 | } | |
4419 | else | |
fa9a63c5 RM |
4420 | { |
4421 | /* These braces fend off a "empty body in an else-statement" | |
25fe55af | 4422 | warning under GCC when assert expands to nothing. */ |
fa9a63c5 RM |
4423 | assert (bufp->regs_allocated == REGS_FIXED); |
4424 | } | |
4425 | ||
25fe55af RS |
4426 | /* Convert the pointer data in `regstart' and `regend' to |
4427 | indices. Register zero has to be set differently, | |
4428 | since we haven't kept track of any info for it. */ | |
4429 | if (regs->num_regs > 0) | |
4430 | { | |
4431 | regs->start[0] = pos; | |
4432 | regs->end[0] = (MATCHING_IN_FIRST_STRING | |
fa9a63c5 | 4433 | ? ((regoff_t) (d - string1)) |
25fe55af RS |
4434 | : ((regoff_t) (d - string2 + size1))); |
4435 | } | |
5e69f11e | 4436 | |
25fe55af RS |
4437 | /* Go through the first `min (num_regs, regs->num_regs)' |
4438 | registers, since that is all we initialized. */ | |
fa9a63c5 RM |
4439 | for (mcnt = 1; mcnt < MIN (num_regs, regs->num_regs); mcnt++) |
4440 | { | |
25fe55af RS |
4441 | if (REG_UNSET (regstart[mcnt]) || REG_UNSET (regend[mcnt])) |
4442 | regs->start[mcnt] = regs->end[mcnt] = -1; | |
4443 | else | |
4444 | { | |
fa9a63c5 RM |
4445 | regs->start[mcnt] |
4446 | = (regoff_t) POINTER_TO_OFFSET (regstart[mcnt]); | |
25fe55af | 4447 | regs->end[mcnt] |
fa9a63c5 | 4448 | = (regoff_t) POINTER_TO_OFFSET (regend[mcnt]); |
25fe55af | 4449 | } |
fa9a63c5 | 4450 | } |
5e69f11e | 4451 | |
25fe55af RS |
4452 | /* If the regs structure we return has more elements than |
4453 | were in the pattern, set the extra elements to -1. If | |
4454 | we (re)allocated the registers, this is the case, | |
4455 | because we always allocate enough to have at least one | |
4456 | -1 at the end. */ | |
4457 | for (mcnt = num_regs; mcnt < regs->num_regs; mcnt++) | |
4458 | regs->start[mcnt] = regs->end[mcnt] = -1; | |
fa9a63c5 RM |
4459 | } /* regs && !bufp->no_sub */ |
4460 | ||
25fe55af RS |
4461 | DEBUG_PRINT4 ("%u failure points pushed, %u popped (%u remain).\n", |
4462 | nfailure_points_pushed, nfailure_points_popped, | |
4463 | nfailure_points_pushed - nfailure_points_popped); | |
4464 | DEBUG_PRINT2 ("%u registers pushed.\n", num_regs_pushed); | |
fa9a63c5 | 4465 | |
25fe55af | 4466 | mcnt = d - pos - (MATCHING_IN_FIRST_STRING |
5e69f11e | 4467 | ? string1 |
fa9a63c5 RM |
4468 | : string2 - size1); |
4469 | ||
25fe55af | 4470 | DEBUG_PRINT2 ("Returning %d from re_match_2.\n", mcnt); |
fa9a63c5 | 4471 | |
25fe55af RS |
4472 | FREE_VARIABLES (); |
4473 | return mcnt; | |
4474 | } | |
fa9a63c5 | 4475 | |
25fe55af | 4476 | /* Otherwise match next pattern command. */ |
fa9a63c5 RM |
4477 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++)) |
4478 | { | |
25fe55af RS |
4479 | /* Ignore these. Used to ignore the n of succeed_n's which |
4480 | currently have n == 0. */ | |
4481 | case no_op: | |
4482 | DEBUG_PRINT1 ("EXECUTING no_op.\n"); | |
4483 | break; | |
fa9a63c5 RM |
4484 | |
4485 | case succeed: | |
25fe55af | 4486 | DEBUG_PRINT1 ("EXECUTING succeed.\n"); |
fa9a63c5 RM |
4487 | goto succeed_label; |
4488 | ||
25fe55af RS |
4489 | /* Match the next n pattern characters exactly. The following |
4490 | byte in the pattern defines n, and the n bytes after that | |
4491 | are the characters to match. */ | |
fa9a63c5 RM |
4492 | case exactn: |
4493 | mcnt = *p++; | |
25fe55af | 4494 | DEBUG_PRINT2 ("EXECUTING exactn %d.\n", mcnt); |
fa9a63c5 | 4495 | |
25fe55af RS |
4496 | /* This is written out as an if-else so we don't waste time |
4497 | testing `translate' inside the loop. */ | |
4498 | if (translate) | |
fa9a63c5 RM |
4499 | { |
4500 | do | |
4501 | { | |
4502 | PREFETCH (); | |
bc192b5b | 4503 | if ((unsigned char) RE_TRANSLATE (translate, (unsigned char) *d++) |
6676cb1c | 4504 | != (unsigned char) *p++) |
25fe55af | 4505 | goto fail; |
fa9a63c5 RM |
4506 | } |
4507 | while (--mcnt); | |
4508 | } | |
4509 | else | |
4510 | { | |
4511 | do | |
4512 | { | |
4513 | PREFETCH (); | |
4514 | if (*d++ != (char) *p++) goto fail; | |
4515 | } | |
4516 | while (--mcnt); | |
4517 | } | |
4518 | SET_REGS_MATCHED (); | |
25fe55af | 4519 | break; |
fa9a63c5 RM |
4520 | |
4521 | ||
25fe55af | 4522 | /* Match any character except possibly a newline or a null. */ |
fa9a63c5 | 4523 | case anychar: |
25fe55af | 4524 | DEBUG_PRINT1 ("EXECUTING anychar.\n"); |
fa9a63c5 | 4525 | |
25fe55af | 4526 | PREFETCH (); |
fa9a63c5 | 4527 | |
25fe55af RS |
4528 | if ((!(bufp->syntax & RE_DOT_NEWLINE) && TRANSLATE (*d) == '\n') |
4529 | || (bufp->syntax & RE_DOT_NOT_NULL && TRANSLATE (*d) == '\000')) | |
fa9a63c5 RM |
4530 | goto fail; |
4531 | ||
25fe55af RS |
4532 | SET_REGS_MATCHED (); |
4533 | DEBUG_PRINT2 (" Matched `%d'.\n", *d); | |
b18215fc | 4534 | d += multibyte ? MULTIBYTE_FORM_LENGTH (d, dend - d) : 1; |
fa9a63c5 RM |
4535 | break; |
4536 | ||
4537 | ||
4538 | case charset: | |
4539 | case charset_not: | |
4540 | { | |
b18215fc | 4541 | register unsigned int c; |
fa9a63c5 | 4542 | boolean not = (re_opcode_t) *(p - 1) == charset_not; |
b18215fc RS |
4543 | int len; |
4544 | ||
4545 | /* Start of actual range_table, or end of bitmap if there is no | |
4546 | range table. */ | |
4547 | unsigned char *range_table; | |
4548 | ||
25fe55af | 4549 | /* Nonzero if there is range table. */ |
b18215fc RS |
4550 | int range_table_exists; |
4551 | ||
25fe55af | 4552 | /* Number of ranges of range table. Not in bytes. */ |
b18215fc | 4553 | int count; |
fa9a63c5 | 4554 | |
25fe55af | 4555 | DEBUG_PRINT2 ("EXECUTING charset%s.\n", not ? "_not" : ""); |
fa9a63c5 RM |
4556 | |
4557 | PREFETCH (); | |
b18215fc | 4558 | c = (unsigned char) *d; |
fa9a63c5 | 4559 | |
b18215fc RS |
4560 | range_table = CHARSET_RANGE_TABLE (&p[-1]); /* Past the bitmap. */ |
4561 | range_table_exists = CHARSET_RANGE_TABLE_EXISTS_P (&p[-1]); | |
4562 | if (range_table_exists) | |
4563 | EXTRACT_NUMBER_AND_INCR (count, range_table); | |
4564 | else | |
4565 | count = 0; | |
4566 | ||
4567 | if (multibyte && BASE_LEADING_CODE_P (c)) | |
4568 | c = STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
4569 | ||
4570 | if (SINGLE_BYTE_CHAR_P (c)) | |
4571 | { /* Lookup bitmap. */ | |
4572 | c = TRANSLATE (c); /* The character to match. */ | |
4573 | len = 1; | |
4574 | ||
4575 | /* Cast to `unsigned' instead of `unsigned char' in | |
4576 | case the bit list is a full 32 bytes long. */ | |
4577 | if (c < (unsigned) (CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH) | |
fa9a63c5 RM |
4578 | && p[1 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH))) |
4579 | not = !not; | |
b18215fc RS |
4580 | } |
4581 | else if (range_table_exists) | |
4582 | CHARSET_LOOKUP_RANGE_TABLE_RAW (not, c, range_table, count); | |
fa9a63c5 | 4583 | |
b18215fc | 4584 | p = CHARSET_RANGE_TABLE_END (range_table, count); |
fa9a63c5 RM |
4585 | |
4586 | if (!not) goto fail; | |
5e69f11e | 4587 | |
fa9a63c5 | 4588 | SET_REGS_MATCHED (); |
b18215fc | 4589 | d += len; |
fa9a63c5 RM |
4590 | break; |
4591 | } | |
4592 | ||
4593 | ||
25fe55af RS |
4594 | /* The beginning of a group is represented by start_memory. |
4595 | The arguments are the register number in the next byte, and the | |
4596 | number of groups inner to this one in the next. The text | |
4597 | matched within the group is recorded (in the internal | |
4598 | registers data structure) under the register number. */ | |
4599 | case start_memory: | |
fa9a63c5 RM |
4600 | DEBUG_PRINT3 ("EXECUTING start_memory %d (%d):\n", *p, p[1]); |
4601 | ||
25fe55af | 4602 | /* Find out if this group can match the empty string. */ |
fa9a63c5 | 4603 | p1 = p; /* To send to group_match_null_string_p. */ |
5e69f11e | 4604 | |
25fe55af RS |
4605 | if (REG_MATCH_NULL_STRING_P (reg_info[*p]) == MATCH_NULL_UNSET_VALUE) |
4606 | REG_MATCH_NULL_STRING_P (reg_info[*p]) | |
4607 | = group_match_null_string_p (&p1, pend, reg_info); | |
4608 | ||
4609 | /* Save the position in the string where we were the last time | |
4610 | we were at this open-group operator in case the group is | |
4611 | operated upon by a repetition operator, e.g., with `(a*)*b' | |
4612 | against `ab'; then we want to ignore where we are now in | |
4613 | the string in case this attempt to match fails. */ | |
4614 | old_regstart[*p] = REG_MATCH_NULL_STRING_P (reg_info[*p]) | |
4615 | ? REG_UNSET (regstart[*p]) ? d : regstart[*p] | |
4616 | : regstart[*p]; | |
5e69f11e | 4617 | DEBUG_PRINT2 (" old_regstart: %d\n", |
fa9a63c5 RM |
4618 | POINTER_TO_OFFSET (old_regstart[*p])); |
4619 | ||
25fe55af | 4620 | regstart[*p] = d; |
fa9a63c5 RM |
4621 | DEBUG_PRINT2 (" regstart: %d\n", POINTER_TO_OFFSET (regstart[*p])); |
4622 | ||
25fe55af RS |
4623 | IS_ACTIVE (reg_info[*p]) = 1; |
4624 | MATCHED_SOMETHING (reg_info[*p]) = 0; | |
fa9a63c5 RM |
4625 | |
4626 | /* Clear this whenever we change the register activity status. */ | |
4627 | set_regs_matched_done = 0; | |
5e69f11e | 4628 | |
25fe55af RS |
4629 | /* This is the new highest active register. */ |
4630 | highest_active_reg = *p; | |
5e69f11e | 4631 | |
25fe55af RS |
4632 | /* If nothing was active before, this is the new lowest active |
4633 | register. */ | |
4634 | if (lowest_active_reg == NO_LOWEST_ACTIVE_REG) | |
4635 | lowest_active_reg = *p; | |
fa9a63c5 | 4636 | |
25fe55af RS |
4637 | /* Move past the register number and inner group count. */ |
4638 | p += 2; | |
fa9a63c5 RM |
4639 | just_past_start_mem = p; |
4640 | ||
25fe55af | 4641 | break; |
fa9a63c5 RM |
4642 | |
4643 | ||
25fe55af RS |
4644 | /* The stop_memory opcode represents the end of a group. Its |
4645 | arguments are the same as start_memory's: the register | |
4646 | number, and the number of inner groups. */ | |
fa9a63c5 RM |
4647 | case stop_memory: |
4648 | DEBUG_PRINT3 ("EXECUTING stop_memory %d (%d):\n", *p, p[1]); | |
5e69f11e | 4649 | |
25fe55af RS |
4650 | /* We need to save the string position the last time we were at |
4651 | this close-group operator in case the group is operated | |
4652 | upon by a repetition operator, e.g., with `((a*)*(b*)*)*' | |
4653 | against `aba'; then we want to ignore where we are now in | |
4654 | the string in case this attempt to match fails. */ | |
4655 | old_regend[*p] = REG_MATCH_NULL_STRING_P (reg_info[*p]) | |
4656 | ? REG_UNSET (regend[*p]) ? d : regend[*p] | |
fa9a63c5 | 4657 | : regend[*p]; |
5e69f11e | 4658 | DEBUG_PRINT2 (" old_regend: %d\n", |
fa9a63c5 RM |
4659 | POINTER_TO_OFFSET (old_regend[*p])); |
4660 | ||
25fe55af | 4661 | regend[*p] = d; |
fa9a63c5 RM |
4662 | DEBUG_PRINT2 (" regend: %d\n", POINTER_TO_OFFSET (regend[*p])); |
4663 | ||
25fe55af RS |
4664 | /* This register isn't active anymore. */ |
4665 | IS_ACTIVE (reg_info[*p]) = 0; | |
fa9a63c5 RM |
4666 | |
4667 | /* Clear this whenever we change the register activity status. */ | |
4668 | set_regs_matched_done = 0; | |
4669 | ||
25fe55af RS |
4670 | /* If this was the only register active, nothing is active |
4671 | anymore. */ | |
4672 | if (lowest_active_reg == highest_active_reg) | |
4673 | { | |
4674 | lowest_active_reg = NO_LOWEST_ACTIVE_REG; | |
4675 | highest_active_reg = NO_HIGHEST_ACTIVE_REG; | |
4676 | } | |
4677 | else | |
4678 | { /* We must scan for the new highest active register, since | |
4679 | it isn't necessarily one less than now: consider | |
4680 | (a(b)c(d(e)f)g). When group 3 ends, after the f), the | |
4681 | new highest active register is 1. */ | |
4682 | unsigned char r = *p - 1; | |
4683 | while (r > 0 && !IS_ACTIVE (reg_info[r])) | |
4684 | r--; | |
4685 | ||
4686 | /* If we end up at register zero, that means that we saved | |
4687 | the registers as the result of an `on_failure_jump', not | |
4688 | a `start_memory', and we jumped to past the innermost | |
4689 | `stop_memory'. For example, in ((.)*) we save | |
4690 | registers 1 and 2 as a result of the *, but when we pop | |
4691 | back to the second ), we are at the stop_memory 1. | |
4692 | Thus, nothing is active. */ | |
fa9a63c5 | 4693 | if (r == 0) |
25fe55af RS |
4694 | { |
4695 | lowest_active_reg = NO_LOWEST_ACTIVE_REG; | |
4696 | highest_active_reg = NO_HIGHEST_ACTIVE_REG; | |
4697 | } | |
4698 | else | |
4699 | highest_active_reg = r; | |
4700 | } | |
4701 | ||
4702 | /* If just failed to match something this time around with a | |
4703 | group that's operated on by a repetition operator, try to | |
4704 | force exit from the ``loop'', and restore the register | |
4705 | information for this group that we had before trying this | |
4706 | last match. */ | |
4707 | if ((!MATCHED_SOMETHING (reg_info[*p]) | |
4708 | || just_past_start_mem == p - 1) | |
5e69f11e | 4709 | && (p + 2) < pend) |
25fe55af RS |
4710 | { |
4711 | boolean is_a_jump_n = false; | |
4712 | ||
4713 | p1 = p + 2; | |
4714 | mcnt = 0; | |
4715 | switch ((re_opcode_t) *p1++) | |
4716 | { | |
4717 | case jump_n: | |
fa9a63c5 | 4718 | is_a_jump_n = true; |
25fe55af | 4719 | case pop_failure_jump: |
fa9a63c5 RM |
4720 | case maybe_pop_jump: |
4721 | case jump: | |
4722 | case dummy_failure_jump: | |
25fe55af | 4723 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); |
fa9a63c5 RM |
4724 | if (is_a_jump_n) |
4725 | p1 += 2; | |
25fe55af | 4726 | break; |
5e69f11e | 4727 | |
25fe55af RS |
4728 | default: |
4729 | /* do nothing */ ; | |
4730 | } | |
fa9a63c5 | 4731 | p1 += mcnt; |
5e69f11e | 4732 | |
25fe55af RS |
4733 | /* If the next operation is a jump backwards in the pattern |
4734 | to an on_failure_jump right before the start_memory | |
4735 | corresponding to this stop_memory, exit from the loop | |
4736 | by forcing a failure after pushing on the stack the | |
4737 | on_failure_jump's jump in the pattern, and d. */ | |
4738 | if (mcnt < 0 && (re_opcode_t) *p1 == on_failure_jump | |
4739 | && (re_opcode_t) p1[3] == start_memory && p1[4] == *p) | |
fa9a63c5 | 4740 | { |
25fe55af RS |
4741 | /* If this group ever matched anything, then restore |
4742 | what its registers were before trying this last | |
4743 | failed match, e.g., with `(a*)*b' against `ab' for | |
4744 | regstart[1], and, e.g., with `((a*)*(b*)*)*' | |
4745 | against `aba' for regend[3]. | |
5e69f11e | 4746 | |
25fe55af RS |
4747 | Also restore the registers for inner groups for, |
4748 | e.g., `((a*)(b*))*' against `aba' (register 3 would | |
4749 | otherwise get trashed). */ | |
5e69f11e | 4750 | |
25fe55af | 4751 | if (EVER_MATCHED_SOMETHING (reg_info[*p])) |
fa9a63c5 | 4752 | { |
5e69f11e RM |
4753 | unsigned r; |
4754 | ||
25fe55af | 4755 | EVER_MATCHED_SOMETHING (reg_info[*p]) = 0; |
5e69f11e | 4756 | |
fa9a63c5 | 4757 | /* Restore this and inner groups' (if any) registers. */ |
25fe55af RS |
4758 | for (r = *p; r < *p + *(p + 1); r++) |
4759 | { | |
4760 | regstart[r] = old_regstart[r]; | |
4761 | ||
4762 | /* xx why this test? */ | |
4763 | if (old_regend[r] >= regstart[r]) | |
4764 | regend[r] = old_regend[r]; | |
4765 | } | |
4766 | } | |
fa9a63c5 | 4767 | p1++; |
25fe55af RS |
4768 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); |
4769 | PUSH_FAILURE_POINT (p1 + mcnt, d, -2); | |
fa9a63c5 | 4770 | |
25fe55af RS |
4771 | goto fail; |
4772 | } | |
4773 | } | |
5e69f11e | 4774 | |
25fe55af RS |
4775 | /* Move past the register number and the inner group count. */ |
4776 | p += 2; | |
4777 | break; | |
fa9a63c5 RM |
4778 | |
4779 | ||
4780 | /* \<digit> has been turned into a `duplicate' command which is | |
25fe55af RS |
4781 | followed by the numeric value of <digit> as the register number. */ |
4782 | case duplicate: | |
fa9a63c5 RM |
4783 | { |
4784 | register const char *d2, *dend2; | |
25fe55af | 4785 | int regno = *p++; /* Get which register to match against. */ |
fa9a63c5 RM |
4786 | DEBUG_PRINT2 ("EXECUTING duplicate %d.\n", regno); |
4787 | ||
25fe55af RS |
4788 | /* Can't back reference a group which we've never matched. */ |
4789 | if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno])) | |
4790 | goto fail; | |
5e69f11e | 4791 | |
25fe55af RS |
4792 | /* Where in input to try to start matching. */ |
4793 | d2 = regstart[regno]; | |
5e69f11e | 4794 | |
25fe55af RS |
4795 | /* Where to stop matching; if both the place to start and |
4796 | the place to stop matching are in the same string, then | |
4797 | set to the place to stop, otherwise, for now have to use | |
4798 | the end of the first string. */ | |
fa9a63c5 | 4799 | |
25fe55af | 4800 | dend2 = ((FIRST_STRING_P (regstart[regno]) |
fa9a63c5 RM |
4801 | == FIRST_STRING_P (regend[regno])) |
4802 | ? regend[regno] : end_match_1); | |
4803 | for (;;) | |
4804 | { | |
4805 | /* If necessary, advance to next segment in register | |
25fe55af | 4806 | contents. */ |
fa9a63c5 RM |
4807 | while (d2 == dend2) |
4808 | { | |
4809 | if (dend2 == end_match_2) break; | |
4810 | if (dend2 == regend[regno]) break; | |
4811 | ||
25fe55af RS |
4812 | /* End of string1 => advance to string2. */ |
4813 | d2 = string2; | |
4814 | dend2 = regend[regno]; | |
fa9a63c5 RM |
4815 | } |
4816 | /* At end of register contents => success */ | |
4817 | if (d2 == dend2) break; | |
4818 | ||
4819 | /* If necessary, advance to next segment in data. */ | |
4820 | PREFETCH (); | |
4821 | ||
4822 | /* How many characters left in this segment to match. */ | |
4823 | mcnt = dend - d; | |
5e69f11e | 4824 | |
fa9a63c5 | 4825 | /* Want how many consecutive characters we can match in |
25fe55af RS |
4826 | one shot, so, if necessary, adjust the count. */ |
4827 | if (mcnt > dend2 - d2) | |
fa9a63c5 | 4828 | mcnt = dend2 - d2; |
5e69f11e | 4829 | |
fa9a63c5 | 4830 | /* Compare that many; failure if mismatch, else move |
25fe55af | 4831 | past them. */ |
5e69f11e | 4832 | if (translate |
25fe55af RS |
4833 | ? bcmp_translate (d, d2, mcnt, translate) |
4834 | : bcmp (d, d2, mcnt)) | |
fa9a63c5 RM |
4835 | goto fail; |
4836 | d += mcnt, d2 += mcnt; | |
4837 | ||
25fe55af | 4838 | /* Do this because we've match some characters. */ |
fa9a63c5 RM |
4839 | SET_REGS_MATCHED (); |
4840 | } | |
4841 | } | |
4842 | break; | |
4843 | ||
4844 | ||
25fe55af RS |
4845 | /* begline matches the empty string at the beginning of the string |
4846 | (unless `not_bol' is set in `bufp'), and, if | |
4847 | `newline_anchor' is set, after newlines. */ | |
fa9a63c5 | 4848 | case begline: |
25fe55af | 4849 | DEBUG_PRINT1 ("EXECUTING begline.\n"); |
5e69f11e | 4850 | |
25fe55af RS |
4851 | if (AT_STRINGS_BEG (d)) |
4852 | { | |
4853 | if (!bufp->not_bol) break; | |
4854 | } | |
4855 | else if (d[-1] == '\n' && bufp->newline_anchor) | |
4856 | { | |
4857 | break; | |
4858 | } | |
4859 | /* In all other cases, we fail. */ | |
4860 | goto fail; | |
fa9a63c5 RM |
4861 | |
4862 | ||
25fe55af | 4863 | /* endline is the dual of begline. */ |
fa9a63c5 | 4864 | case endline: |
25fe55af | 4865 | DEBUG_PRINT1 ("EXECUTING endline.\n"); |
fa9a63c5 | 4866 | |
25fe55af RS |
4867 | if (AT_STRINGS_END (d)) |
4868 | { | |
4869 | if (!bufp->not_eol) break; | |
4870 | } | |
5e69f11e | 4871 | |
25fe55af RS |
4872 | /* We have to ``prefetch'' the next character. */ |
4873 | else if ((d == end1 ? *string2 : *d) == '\n' | |
4874 | && bufp->newline_anchor) | |
4875 | { | |
4876 | break; | |
4877 | } | |
4878 | goto fail; | |
fa9a63c5 RM |
4879 | |
4880 | ||
4881 | /* Match at the very beginning of the data. */ | |
25fe55af RS |
4882 | case begbuf: |
4883 | DEBUG_PRINT1 ("EXECUTING begbuf.\n"); | |
4884 | if (AT_STRINGS_BEG (d)) | |
4885 | break; | |
4886 | goto fail; | |
fa9a63c5 RM |
4887 | |
4888 | ||
4889 | /* Match at the very end of the data. */ | |
25fe55af RS |
4890 | case endbuf: |
4891 | DEBUG_PRINT1 ("EXECUTING endbuf.\n"); | |
fa9a63c5 RM |
4892 | if (AT_STRINGS_END (d)) |
4893 | break; | |
25fe55af | 4894 | goto fail; |
5e69f11e | 4895 | |
5e69f11e | 4896 | |
25fe55af RS |
4897 | /* on_failure_keep_string_jump is used to optimize `.*\n'. It |
4898 | pushes NULL as the value for the string on the stack. Then | |
4899 | `pop_failure_point' will keep the current value for the | |
4900 | string, instead of restoring it. To see why, consider | |
4901 | matching `foo\nbar' against `.*\n'. The .* matches the foo; | |
4902 | then the . fails against the \n. But the next thing we want | |
4903 | to do is match the \n against the \n; if we restored the | |
4904 | string value, we would be back at the foo. | |
4905 | ||
4906 | Because this is used only in specific cases, we don't need to | |
4907 | check all the things that `on_failure_jump' does, to make | |
4908 | sure the right things get saved on the stack. Hence we don't | |
4909 | share its code. The only reason to push anything on the | |
4910 | stack at all is that otherwise we would have to change | |
4911 | `anychar's code to do something besides goto fail in this | |
4912 | case; that seems worse than this. */ | |
4913 | case on_failure_keep_string_jump: | |
4914 | DEBUG_PRINT1 ("EXECUTING on_failure_keep_string_jump"); | |
fa9a63c5 | 4915 | |
25fe55af RS |
4916 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
4917 | DEBUG_PRINT3 (" %d (to 0x%x):\n", mcnt, p + mcnt); | |
b18215fc | 4918 | |
25fe55af RS |
4919 | PUSH_FAILURE_POINT (p + mcnt, NULL, -2); |
4920 | break; | |
fa9a63c5 RM |
4921 | |
4922 | ||
4923 | /* Uses of on_failure_jump: | |
5e69f11e | 4924 | |
25fe55af RS |
4925 | Each alternative starts with an on_failure_jump that points |
4926 | to the beginning of the next alternative. Each alternative | |
4927 | except the last ends with a jump that in effect jumps past | |
4928 | the rest of the alternatives. (They really jump to the | |
4929 | ending jump of the following alternative, because tensioning | |
4930 | these jumps is a hassle.) | |
fa9a63c5 | 4931 | |
25fe55af RS |
4932 | Repeats start with an on_failure_jump that points past both |
4933 | the repetition text and either the following jump or | |
4934 | pop_failure_jump back to this on_failure_jump. */ | |
fa9a63c5 | 4935 | case on_failure_jump: |
25fe55af RS |
4936 | on_failure: |
4937 | DEBUG_PRINT1 ("EXECUTING on_failure_jump"); | |
4938 | ||
4939 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
4940 | DEBUG_PRINT3 (" %d (to 0x%x)", mcnt, p + mcnt); | |
4941 | ||
4942 | /* If this on_failure_jump comes right before a group (i.e., | |
4943 | the original * applied to a group), save the information | |
4944 | for that group and all inner ones, so that if we fail back | |
4945 | to this point, the group's information will be correct. | |
4946 | For example, in \(a*\)*\1, we need the preceding group, | |
4947 | and in \(zz\(a*\)b*\)\2, we need the inner group. */ | |
4948 | ||
4949 | /* We can't use `p' to check ahead because we push | |
4950 | a failure point to `p + mcnt' after we do this. */ | |
4951 | p1 = p; | |
4952 | ||
4953 | /* We need to skip no_op's before we look for the | |
4954 | start_memory in case this on_failure_jump is happening as | |
4955 | the result of a completed succeed_n, as in \(a\)\{1,3\}b\1 | |
4956 | against aba. */ | |
4957 | while (p1 < pend && (re_opcode_t) *p1 == no_op) | |
4958 | p1++; | |
4959 | ||
4960 | if (p1 < pend && (re_opcode_t) *p1 == start_memory) | |
4961 | { | |
4962 | /* We have a new highest active register now. This will | |
4963 | get reset at the start_memory we are about to get to, | |
4964 | but we will have saved all the registers relevant to | |
4965 | this repetition op, as described above. */ | |
4966 | highest_active_reg = *(p1 + 1) + *(p1 + 2); | |
4967 | if (lowest_active_reg == NO_LOWEST_ACTIVE_REG) | |
4968 | lowest_active_reg = *(p1 + 1); | |
4969 | } | |
4970 | ||
4971 | DEBUG_PRINT1 (":\n"); | |
4972 | PUSH_FAILURE_POINT (p + mcnt, d, -2); | |
4973 | break; | |
4974 | ||
4975 | ||
4976 | /* A smart repeat ends with `maybe_pop_jump'. | |
4977 | We change it to either `pop_failure_jump' or `jump'. */ | |
4978 | case maybe_pop_jump: | |
4979 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
4980 | DEBUG_PRINT2 ("EXECUTING maybe_pop_jump %d.\n", mcnt); | |
4981 | { | |
fa9a63c5 RM |
4982 | register unsigned char *p2 = p; |
4983 | ||
25fe55af RS |
4984 | /* Compare the beginning of the repeat with what in the |
4985 | pattern follows its end. If we can establish that there | |
4986 | is nothing that they would both match, i.e., that we | |
4987 | would have to backtrack because of (as in, e.g., `a*a') | |
4988 | then we can change to pop_failure_jump, because we'll | |
4989 | never have to backtrack. | |
5e69f11e | 4990 | |
25fe55af RS |
4991 | This is not true in the case of alternatives: in |
4992 | `(a|ab)*' we do need to backtrack to the `ab' alternative | |
4993 | (e.g., if the string was `ab'). But instead of trying to | |
4994 | detect that here, the alternative has put on a dummy | |
4995 | failure point which is what we will end up popping. */ | |
fa9a63c5 RM |
4996 | |
4997 | /* Skip over open/close-group commands. | |
4998 | If what follows this loop is a ...+ construct, | |
4999 | look at what begins its body, since we will have to | |
5000 | match at least one of that. */ | |
5001 | while (1) | |
5002 | { | |
5003 | if (p2 + 2 < pend | |
5004 | && ((re_opcode_t) *p2 == stop_memory | |
5005 | || (re_opcode_t) *p2 == start_memory)) | |
5006 | p2 += 3; | |
5007 | else if (p2 + 6 < pend | |
5008 | && (re_opcode_t) *p2 == dummy_failure_jump) | |
5009 | p2 += 6; | |
5010 | else | |
5011 | break; | |
5012 | } | |
5013 | ||
5014 | p1 = p + mcnt; | |
5015 | /* p1[0] ... p1[2] are the `on_failure_jump' corresponding | |
5e69f11e | 5016 | to the `maybe_finalize_jump' of this case. Examine what |
25fe55af | 5017 | follows. */ |
fa9a63c5 | 5018 | |
25fe55af RS |
5019 | /* If we're at the end of the pattern, we can change. */ |
5020 | if (p2 == pend) | |
fa9a63c5 RM |
5021 | { |
5022 | /* Consider what happens when matching ":\(.*\)" | |
5023 | against ":/". I don't really understand this code | |
25fe55af RS |
5024 | yet. */ |
5025 | p[-3] = (unsigned char) pop_failure_jump; | |
5026 | DEBUG_PRINT1 | |
5027 | (" End of pattern: change to `pop_failure_jump'.\n"); | |
5028 | } | |
fa9a63c5 | 5029 | |
25fe55af | 5030 | else if ((re_opcode_t) *p2 == exactn |
fa9a63c5 RM |
5031 | || (bufp->newline_anchor && (re_opcode_t) *p2 == endline)) |
5032 | { | |
b18215fc | 5033 | register unsigned int c |
25fe55af | 5034 | = *p2 == (unsigned char) endline ? '\n' : p2[2]; |
fa9a63c5 | 5035 | |
b18215fc | 5036 | if ((re_opcode_t) p1[3] == exactn) |
e318085a | 5037 | { |
b18215fc RS |
5038 | if (!(multibyte /* && (c != '\n') */ |
5039 | && BASE_LEADING_CODE_P (c)) | |
5040 | ? c != p1[5] | |
5041 | : (STRING_CHAR (&p2[2], pend - &p2[2]) | |
5042 | != STRING_CHAR (&p1[5], pend - &p1[5]))) | |
25fe55af RS |
5043 | { |
5044 | p[-3] = (unsigned char) pop_failure_jump; | |
5045 | DEBUG_PRINT3 (" %c != %c => pop_failure_jump.\n", | |
5046 | c, p1[5]); | |
5047 | } | |
e318085a | 5048 | } |
5e69f11e | 5049 | |
fa9a63c5 RM |
5050 | else if ((re_opcode_t) p1[3] == charset |
5051 | || (re_opcode_t) p1[3] == charset_not) | |
5052 | { | |
5053 | int not = (re_opcode_t) p1[3] == charset_not; | |
5e69f11e | 5054 | |
b18215fc RS |
5055 | if (multibyte /* && (c != '\n') */ |
5056 | && BASE_LEADING_CODE_P (c)) | |
5057 | c = STRING_CHAR (&p2[2], pend - &p2[2]); | |
5058 | ||
5059 | /* Test if C is listed in charset (or charset_not) | |
5060 | at `&p1[3]'. */ | |
5061 | if (SINGLE_BYTE_CHAR_P (c)) | |
5062 | { | |
5063 | if (c < CHARSET_BITMAP_SIZE (&p1[3]) * BYTEWIDTH | |
fa9a63c5 RM |
5064 | && p1[5 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH))) |
5065 | not = !not; | |
b18215fc RS |
5066 | } |
5067 | else if (CHARSET_RANGE_TABLE_EXISTS_P (&p1[3])) | |
5068 | CHARSET_LOOKUP_RANGE_TABLE (not, c, &p1[3]); | |
fa9a63c5 | 5069 | |
25fe55af RS |
5070 | /* `not' is equal to 1 if c would match, which means |
5071 | that we can't change to pop_failure_jump. */ | |
fa9a63c5 | 5072 | if (!not) |
25fe55af RS |
5073 | { |
5074 | p[-3] = (unsigned char) pop_failure_jump; | |
5075 | DEBUG_PRINT1 (" No match => pop_failure_jump.\n"); | |
5076 | } | |
fa9a63c5 RM |
5077 | } |
5078 | } | |
25fe55af | 5079 | else if ((re_opcode_t) *p2 == charset) |
fa9a63c5 | 5080 | { |
b18215fc | 5081 | if ((re_opcode_t) p1[3] == exactn) |
e318085a | 5082 | { |
b18215fc RS |
5083 | register unsigned int c = p1[5]; |
5084 | int not = 0; | |
5085 | ||
5086 | if (multibyte && BASE_LEADING_CODE_P (c)) | |
5087 | c = STRING_CHAR (&p1[5], pend - &p1[5]); | |
5088 | ||
25fe55af | 5089 | /* Test if C is listed in charset at `p2'. */ |
b18215fc RS |
5090 | if (SINGLE_BYTE_CHAR_P (c)) |
5091 | { | |
5092 | if (c < CHARSET_BITMAP_SIZE (p2) * BYTEWIDTH | |
5093 | && (p2[2 + c / BYTEWIDTH] | |
5094 | & (1 << (c % BYTEWIDTH)))) | |
5095 | not = !not; | |
5096 | } | |
5097 | else if (CHARSET_RANGE_TABLE_EXISTS_P (p2)) | |
5098 | CHARSET_LOOKUP_RANGE_TABLE (not, c, p2); | |
5099 | ||
5100 | if (!not) | |
25fe55af RS |
5101 | { |
5102 | p[-3] = (unsigned char) pop_failure_jump; | |
5103 | DEBUG_PRINT1 (" No match => pop_failure_jump.\n"); | |
b18215fc | 5104 | } |
25fe55af | 5105 | } |
5e69f11e | 5106 | |
b18215fc RS |
5107 | /* It is hard to list up all the character in charset |
5108 | P2 if it includes multibyte character. Give up in | |
5109 | such case. */ | |
5110 | else if (!multibyte || !CHARSET_RANGE_TABLE_EXISTS_P (p2)) | |
5111 | { | |
5112 | /* Now, we are sure that P2 has no range table. | |
5113 | So, for the size of bitmap in P2, `p2[1]' is | |
25fe55af | 5114 | enough. But P1 may have range table, so the |
b18215fc RS |
5115 | size of bitmap table of P1 is extracted by |
5116 | using macro `CHARSET_BITMAP_SIZE'. | |
5117 | ||
5118 | Since we know that all the character listed in | |
5119 | P2 is ASCII, it is enough to test only bitmap | |
5120 | table of P1. */ | |
25fe55af | 5121 | |
b18215fc | 5122 | if ((re_opcode_t) p1[3] == charset_not) |
fa9a63c5 RM |
5123 | { |
5124 | int idx; | |
b18215fc | 5125 | /* We win if the charset_not inside the loop lists |
25fe55af | 5126 | every character listed in the charset after. */ |
fa9a63c5 RM |
5127 | for (idx = 0; idx < (int) p2[1]; idx++) |
5128 | if (! (p2[2 + idx] == 0 | |
b18215fc | 5129 | || (idx < CHARSET_BITMAP_SIZE (&p1[3]) |
fa9a63c5 RM |
5130 | && ((p2[2 + idx] & ~ p1[5 + idx]) == 0)))) |
5131 | break; | |
5132 | ||
5133 | if (idx == p2[1]) | |
25fe55af RS |
5134 | { |
5135 | p[-3] = (unsigned char) pop_failure_jump; | |
5136 | DEBUG_PRINT1 (" No match => pop_failure_jump.\n"); | |
5137 | } | |
fa9a63c5 RM |
5138 | } |
5139 | else if ((re_opcode_t) p1[3] == charset) | |
5140 | { | |
5141 | int idx; | |
5142 | /* We win if the charset inside the loop | |
5143 | has no overlap with the one after the loop. */ | |
5144 | for (idx = 0; | |
b18215fc RS |
5145 | (idx < (int) p2[1] |
5146 | && idx < CHARSET_BITMAP_SIZE (&p1[3])); | |
fa9a63c5 RM |
5147 | idx++) |
5148 | if ((p2[2 + idx] & p1[5 + idx]) != 0) | |
5149 | break; | |
5150 | ||
b18215fc RS |
5151 | if (idx == p2[1] |
5152 | || idx == CHARSET_BITMAP_SIZE (&p1[3])) | |
25fe55af RS |
5153 | { |
5154 | p[-3] = (unsigned char) pop_failure_jump; | |
5155 | DEBUG_PRINT1 (" No match => pop_failure_jump.\n"); | |
5156 | } | |
fa9a63c5 RM |
5157 | } |
5158 | } | |
5159 | } | |
b18215fc | 5160 | } |
fa9a63c5 RM |
5161 | p -= 2; /* Point at relative address again. */ |
5162 | if ((re_opcode_t) p[-1] != pop_failure_jump) | |
5163 | { | |
5164 | p[-1] = (unsigned char) jump; | |
25fe55af | 5165 | DEBUG_PRINT1 (" Match => jump.\n"); |
fa9a63c5 RM |
5166 | goto unconditional_jump; |
5167 | } | |
25fe55af | 5168 | /* Note fall through. */ |
fa9a63c5 RM |
5169 | |
5170 | ||
5171 | /* The end of a simple repeat has a pop_failure_jump back to | |
25fe55af RS |
5172 | its matching on_failure_jump, where the latter will push a |
5173 | failure point. The pop_failure_jump takes off failure | |
5174 | points put on by this pop_failure_jump's matching | |
5175 | on_failure_jump; we got through the pattern to here from the | |
5176 | matching on_failure_jump, so didn't fail. */ | |
5177 | case pop_failure_jump: | |
5178 | { | |
5179 | /* We need to pass separate storage for the lowest and | |
5180 | highest registers, even though we don't care about the | |
5181 | actual values. Otherwise, we will restore only one | |
5182 | register from the stack, since lowest will == highest in | |
5183 | `pop_failure_point'. */ | |
5184 | unsigned dummy_low_reg, dummy_high_reg; | |
5185 | unsigned char *pdummy; | |
5186 | const char *sdummy; | |
5187 | ||
5188 | DEBUG_PRINT1 ("EXECUTING pop_failure_jump.\n"); | |
5189 | POP_FAILURE_POINT (sdummy, pdummy, | |
5190 | dummy_low_reg, dummy_high_reg, | |
5191 | reg_dummy, reg_dummy, reg_info_dummy); | |
5192 | } | |
5193 | /* Note fall through. */ | |
5194 | ||
5195 | ||
5196 | /* Unconditionally jump (without popping any failure points). */ | |
5197 | case jump: | |
fa9a63c5 RM |
5198 | unconditional_jump: |
5199 | EXTRACT_NUMBER_AND_INCR (mcnt, p); /* Get the amount to jump. */ | |
25fe55af RS |
5200 | DEBUG_PRINT2 ("EXECUTING jump %d ", mcnt); |
5201 | p += mcnt; /* Do the jump. */ | |
5202 | DEBUG_PRINT2 ("(to 0x%x).\n", p); | |
5203 | break; | |
5204 | ||
5205 | ||
5206 | /* We need this opcode so we can detect where alternatives end | |
5207 | in `group_match_null_string_p' et al. */ | |
5208 | case jump_past_alt: | |
5209 | DEBUG_PRINT1 ("EXECUTING jump_past_alt.\n"); | |
5210 | goto unconditional_jump; | |
5211 | ||
5212 | ||
5213 | /* Normally, the on_failure_jump pushes a failure point, which | |
5214 | then gets popped at pop_failure_jump. We will end up at | |
5215 | pop_failure_jump, also, and with a pattern of, say, `a+', we | |
5216 | are skipping over the on_failure_jump, so we have to push | |
5217 | something meaningless for pop_failure_jump to pop. */ | |
5218 | case dummy_failure_jump: | |
5219 | DEBUG_PRINT1 ("EXECUTING dummy_failure_jump.\n"); | |
5220 | /* It doesn't matter what we push for the string here. What | |
5221 | the code at `fail' tests is the value for the pattern. */ | |
5222 | PUSH_FAILURE_POINT (0, 0, -2); | |
5223 | goto unconditional_jump; | |
5224 | ||
5225 | ||
5226 | /* At the end of an alternative, we need to push a dummy failure | |
5227 | point in case we are followed by a `pop_failure_jump', because | |
5228 | we don't want the failure point for the alternative to be | |
5229 | popped. For example, matching `(a|ab)*' against `aab' | |
5230 | requires that we match the `ab' alternative. */ | |
5231 | case push_dummy_failure: | |
5232 | DEBUG_PRINT1 ("EXECUTING push_dummy_failure.\n"); | |
5233 | /* See comments just above at `dummy_failure_jump' about the | |
5234 | two zeroes. */ | |
5235 | PUSH_FAILURE_POINT (0, 0, -2); | |
fa9a63c5 RM |
5236 | break; |
5237 | ||
25fe55af RS |
5238 | /* Have to succeed matching what follows at least n times. |
5239 | After that, handle like `on_failure_jump'. */ | |
5240 | case succeed_n: | |
5241 | EXTRACT_NUMBER (mcnt, p + 2); | |
5242 | DEBUG_PRINT2 ("EXECUTING succeed_n %d.\n", mcnt); | |
5e69f11e | 5243 | |
25fe55af RS |
5244 | assert (mcnt >= 0); |
5245 | /* Originally, this is how many times we HAVE to succeed. */ | |
5246 | if (mcnt > 0) | |
5247 | { | |
5248 | mcnt--; | |
fa9a63c5 | 5249 | p += 2; |
25fe55af RS |
5250 | STORE_NUMBER_AND_INCR (p, mcnt); |
5251 | DEBUG_PRINT3 (" Setting 0x%x to %d.\n", p, mcnt); | |
5252 | } | |
fa9a63c5 | 5253 | else if (mcnt == 0) |
25fe55af RS |
5254 | { |
5255 | DEBUG_PRINT2 (" Setting two bytes from 0x%x to no_op.\n", p+2); | |
fa9a63c5 | 5256 | p[2] = (unsigned char) no_op; |
25fe55af RS |
5257 | p[3] = (unsigned char) no_op; |
5258 | goto on_failure; | |
5259 | } | |
5260 | break; | |
5261 | ||
5262 | case jump_n: | |
5263 | EXTRACT_NUMBER (mcnt, p + 2); | |
5264 | DEBUG_PRINT2 ("EXECUTING jump_n %d.\n", mcnt); | |
5265 | ||
5266 | /* Originally, this is how many times we CAN jump. */ | |
5267 | if (mcnt) | |
5268 | { | |
5269 | mcnt--; | |
5270 | STORE_NUMBER (p + 2, mcnt); | |
5e69f11e | 5271 | goto unconditional_jump; |
25fe55af RS |
5272 | } |
5273 | /* If don't have to jump any more, skip over the rest of command. */ | |
5e69f11e RM |
5274 | else |
5275 | p += 4; | |
25fe55af | 5276 | break; |
5e69f11e | 5277 | |
fa9a63c5 RM |
5278 | case set_number_at: |
5279 | { | |
25fe55af | 5280 | DEBUG_PRINT1 ("EXECUTING set_number_at.\n"); |
fa9a63c5 | 5281 | |
25fe55af RS |
5282 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
5283 | p1 = p + mcnt; | |
5284 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
5285 | DEBUG_PRINT3 (" Setting 0x%x to %d.\n", p1, mcnt); | |
fa9a63c5 | 5286 | STORE_NUMBER (p1, mcnt); |
25fe55af RS |
5287 | break; |
5288 | } | |
9121ca40 KH |
5289 | |
5290 | case wordbound: | |
5291 | DEBUG_PRINT1 ("EXECUTING wordbound.\n"); | |
fa9a63c5 | 5292 | |
b18215fc | 5293 | /* We SUCCEED in one of the following cases: */ |
9121ca40 | 5294 | |
b18215fc | 5295 | /* Case 1: D is at the beginning or the end of string. */ |
9121ca40 KH |
5296 | if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d)) |
5297 | break; | |
b18215fc RS |
5298 | else |
5299 | { | |
5300 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5301 | is the character at D, and S2 is the syntax of C2. */ | |
5302 | int c1, c2, s1, s2; | |
5303 | int pos1 = PTR_TO_OFFSET (d - 1); | |
9121ca40 | 5304 | |
b18215fc RS |
5305 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); |
5306 | GET_CHAR_AFTER_2 (c2, d, string1, end1, string2, end2); | |
5307 | #ifdef emacs | |
5308 | UPDATE_SYNTAX_TABLE (pos1 ? pos1 : 1); | |
25fe55af | 5309 | #endif |
b18215fc RS |
5310 | s1 = SYNTAX (c1); |
5311 | #ifdef emacs | |
5312 | UPDATE_SYNTAX_TABLE_FORWARD (pos1 + 1); | |
25fe55af | 5313 | #endif |
b18215fc RS |
5314 | s2 = SYNTAX (c2); |
5315 | ||
5316 | if (/* Case 2: Only one of S1 and S2 is Sword. */ | |
5317 | ((s1 == Sword) != (s2 == Sword)) | |
5318 | /* Case 3: Both of S1 and S2 are Sword, and macro | |
25fe55af | 5319 | WORD_BOUNDARY_P (C1, C2) returns nonzero. */ |
b18215fc | 5320 | || ((s1 == Sword) && WORD_BOUNDARY_P (c1, c2))) |
9121ca40 | 5321 | break; |
9121ca40 | 5322 | } |
b18215fc | 5323 | goto fail; |
9121ca40 KH |
5324 | |
5325 | case notwordbound: | |
9121ca40 | 5326 | DEBUG_PRINT1 ("EXECUTING notwordbound.\n"); |
b18215fc RS |
5327 | |
5328 | /* We FAIL in one of the following cases: */ | |
5329 | ||
5330 | /* Case 1: D is at the beginning or the end of string. */ | |
9121ca40 KH |
5331 | if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d)) |
5332 | goto fail; | |
b18215fc RS |
5333 | else |
5334 | { | |
5335 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5336 | is the character at D, and S2 is the syntax of C2. */ | |
5337 | int c1, c2, s1, s2; | |
5338 | int pos1 = PTR_TO_OFFSET (d - 1); | |
9121ca40 | 5339 | |
b18215fc RS |
5340 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); |
5341 | GET_CHAR_AFTER_2 (c2, d, string1, end1, string2, end2); | |
5342 | #ifdef emacs | |
5343 | UPDATE_SYNTAX_TABLE (pos1); | |
25fe55af | 5344 | #endif |
b18215fc RS |
5345 | s1 = SYNTAX (c1); |
5346 | #ifdef emacs | |
5347 | UPDATE_SYNTAX_TABLE_FORWARD (pos1 + 1); | |
25fe55af | 5348 | #endif |
b18215fc RS |
5349 | s2 = SYNTAX (c2); |
5350 | ||
5351 | if (/* Case 2: Only one of S1 and S2 is Sword. */ | |
5352 | ((s1 == Sword) != (s2 == Sword)) | |
5353 | /* Case 3: Both of S1 and S2 are Sword, and macro | |
25fe55af | 5354 | WORD_BOUNDARY_P (C1, C2) returns nonzero. */ |
b18215fc | 5355 | || ((s1 == Sword) && WORD_BOUNDARY_P (c1, c2))) |
9121ca40 | 5356 | goto fail; |
9121ca40 | 5357 | } |
b18215fc | 5358 | break; |
fa9a63c5 RM |
5359 | |
5360 | case wordbeg: | |
25fe55af | 5361 | DEBUG_PRINT1 ("EXECUTING wordbeg.\n"); |
fa9a63c5 | 5362 | |
b18215fc RS |
5363 | /* We FAIL in one of the following cases: */ |
5364 | ||
25fe55af | 5365 | /* Case 1: D is at the end of string. */ |
b18215fc | 5366 | if (AT_STRINGS_END (d)) |
25fe55af | 5367 | goto fail; |
b18215fc RS |
5368 | else |
5369 | { | |
5370 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5371 | is the character at D, and S2 is the syntax of C2. */ | |
5372 | int c1, c2, s1, s2; | |
5373 | int pos1 = PTR_TO_OFFSET (d); | |
fa9a63c5 | 5374 | |
b18215fc | 5375 | GET_CHAR_AFTER_2 (c2, d, string1, end1, string2, end2); |
fa9a63c5 | 5376 | #ifdef emacs |
b18215fc | 5377 | UPDATE_SYNTAX_TABLE (pos1); |
25fe55af | 5378 | #endif |
b18215fc | 5379 | s2 = SYNTAX (c2); |
25fe55af | 5380 | |
b18215fc RS |
5381 | /* Case 2: S2 is not Sword. */ |
5382 | if (s2 != Sword) | |
5383 | goto fail; | |
5384 | ||
5385 | /* Case 3: D is not at the beginning of string ... */ | |
5386 | if (!AT_STRINGS_BEG (d)) | |
5387 | { | |
5388 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); | |
5389 | #ifdef emacs | |
5390 | UPDATE_SYNTAX_TABLE_BACKWARD (pos1 - 1); | |
25fe55af | 5391 | #endif |
b18215fc RS |
5392 | s1 = SYNTAX (c1); |
5393 | ||
5394 | /* ... and S1 is Sword, and WORD_BOUNDARY_P (C1, C2) | |
25fe55af | 5395 | returns 0. */ |
b18215fc RS |
5396 | if ((s1 == Sword) && !WORD_BOUNDARY_P (c1, c2)) |
5397 | goto fail; | |
5398 | } | |
5399 | } | |
e318085a RS |
5400 | break; |
5401 | ||
b18215fc | 5402 | case wordend: |
25fe55af | 5403 | DEBUG_PRINT1 ("EXECUTING wordend.\n"); |
b18215fc RS |
5404 | |
5405 | /* We FAIL in one of the following cases: */ | |
5406 | ||
5407 | /* Case 1: D is at the beginning of string. */ | |
5408 | if (AT_STRINGS_BEG (d)) | |
e318085a | 5409 | goto fail; |
b18215fc RS |
5410 | else |
5411 | { | |
5412 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5413 | is the character at D, and S2 is the syntax of C2. */ | |
5414 | int c1, c2, s1, s2; | |
5415 | ||
5416 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); | |
5417 | s1 = SYNTAX (c1); | |
5418 | ||
5419 | /* Case 2: S1 is not Sword. */ | |
5420 | if (s1 != Sword) | |
5421 | goto fail; | |
5422 | ||
5423 | /* Case 3: D is not at the end of string ... */ | |
5424 | if (!AT_STRINGS_END (d)) | |
5425 | { | |
5426 | GET_CHAR_AFTER_2 (c2, d, string1, end1, string2, end2); | |
5427 | s2 = SYNTAX (c2); | |
5428 | ||
5429 | /* ... and S2 is Sword, and WORD_BOUNDARY_P (C1, C2) | |
25fe55af | 5430 | returns 0. */ |
b18215fc | 5431 | if ((s2 == Sword) && !WORD_BOUNDARY_P (c1, c2)) |
25fe55af | 5432 | goto fail; |
b18215fc RS |
5433 | } |
5434 | } | |
e318085a RS |
5435 | break; |
5436 | ||
b18215fc | 5437 | #ifdef emacs |
25fe55af RS |
5438 | case before_dot: |
5439 | DEBUG_PRINT1 ("EXECUTING before_dot.\n"); | |
b18215fc | 5440 | if (PTR_CHAR_POS ((unsigned char *) d) >= PT) |
25fe55af RS |
5441 | goto fail; |
5442 | break; | |
b18215fc | 5443 | |
25fe55af RS |
5444 | case at_dot: |
5445 | DEBUG_PRINT1 ("EXECUTING at_dot.\n"); | |
b18215fc | 5446 | if (PTR_CHAR_POS ((unsigned char *) d) != PT) |
25fe55af RS |
5447 | goto fail; |
5448 | break; | |
b18215fc | 5449 | |
25fe55af RS |
5450 | case after_dot: |
5451 | DEBUG_PRINT1 ("EXECUTING after_dot.\n"); | |
ae93ce92 | 5452 | if (PTR_CHAR_POS ((unsigned char *) d) <= PT) |
25fe55af RS |
5453 | goto fail; |
5454 | break; | |
fa9a63c5 RM |
5455 | |
5456 | case syntaxspec: | |
25fe55af | 5457 | DEBUG_PRINT2 ("EXECUTING syntaxspec %d.\n", mcnt); |
fa9a63c5 RM |
5458 | mcnt = *p++; |
5459 | goto matchsyntax; | |
5460 | ||
25fe55af RS |
5461 | case wordchar: |
5462 | DEBUG_PRINT1 ("EXECUTING Emacs wordchar.\n"); | |
fa9a63c5 | 5463 | mcnt = (int) Sword; |
25fe55af | 5464 | matchsyntax: |
fa9a63c5 | 5465 | PREFETCH (); |
b18215fc RS |
5466 | #ifdef emacs |
5467 | { | |
5468 | int pos1 = PTR_TO_OFFSET (d); | |
5469 | UPDATE_SYNTAX_TABLE (pos1); | |
5470 | } | |
25fe55af | 5471 | #endif |
b18215fc RS |
5472 | { |
5473 | int c, len; | |
5474 | ||
5475 | if (multibyte) | |
5476 | /* we must concern about multibyte form, ... */ | |
5477 | c = STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
5478 | else | |
5479 | /* everything should be handled as ASCII, even though it | |
5480 | looks like multibyte form. */ | |
5481 | c = *d, len = 1; | |
5482 | ||
5483 | if (SYNTAX (c) != (enum syntaxcode) mcnt) | |
fa9a63c5 | 5484 | goto fail; |
b18215fc RS |
5485 | d += len; |
5486 | } | |
25fe55af | 5487 | SET_REGS_MATCHED (); |
fa9a63c5 RM |
5488 | break; |
5489 | ||
5490 | case notsyntaxspec: | |
25fe55af | 5491 | DEBUG_PRINT2 ("EXECUTING notsyntaxspec %d.\n", mcnt); |
fa9a63c5 RM |
5492 | mcnt = *p++; |
5493 | goto matchnotsyntax; | |
5494 | ||
25fe55af RS |
5495 | case notwordchar: |
5496 | DEBUG_PRINT1 ("EXECUTING Emacs notwordchar.\n"); | |
fa9a63c5 | 5497 | mcnt = (int) Sword; |
25fe55af | 5498 | matchnotsyntax: |
fa9a63c5 | 5499 | PREFETCH (); |
b18215fc RS |
5500 | #ifdef emacs |
5501 | { | |
5502 | int pos1 = PTR_TO_OFFSET (d); | |
5503 | UPDATE_SYNTAX_TABLE (pos1); | |
5504 | } | |
25fe55af | 5505 | #endif |
b18215fc RS |
5506 | { |
5507 | int c, len; | |
5508 | ||
5509 | if (multibyte) | |
5510 | c = STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
5511 | else | |
5512 | c = *d, len = 1; | |
5513 | ||
5514 | if (SYNTAX (c) == (enum syntaxcode) mcnt) | |
fa9a63c5 | 5515 | goto fail; |
b18215fc RS |
5516 | d += len; |
5517 | } | |
5518 | SET_REGS_MATCHED (); | |
5519 | break; | |
5520 | ||
5521 | case categoryspec: | |
5522 | DEBUG_PRINT2 ("EXECUTING categoryspec %d.\n", *p); | |
5523 | mcnt = *p++; | |
5524 | PREFETCH (); | |
5525 | { | |
5526 | int c, len; | |
5527 | ||
5528 | if (multibyte) | |
5529 | c = STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
5530 | else | |
5531 | c = *d, len = 1; | |
5532 | ||
5533 | if (!CHAR_HAS_CATEGORY (c, mcnt)) | |
5534 | goto fail; | |
5535 | d += len; | |
5536 | } | |
fa9a63c5 | 5537 | SET_REGS_MATCHED (); |
e318085a | 5538 | break; |
fa9a63c5 | 5539 | |
b18215fc RS |
5540 | case notcategoryspec: |
5541 | DEBUG_PRINT2 ("EXECUTING notcategoryspec %d.\n", *p); | |
5542 | mcnt = *p++; | |
5543 | PREFETCH (); | |
5544 | { | |
5545 | int c, len; | |
5546 | ||
5547 | if (multibyte) | |
5548 | c = STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
5549 | else | |
5550 | c = *d, len = 1; | |
5551 | ||
5552 | if (CHAR_HAS_CATEGORY (c, mcnt)) | |
5553 | goto fail; | |
5554 | d += len; | |
5555 | } | |
5556 | SET_REGS_MATCHED (); | |
5557 | break; | |
5558 | ||
fa9a63c5 RM |
5559 | #else /* not emacs */ |
5560 | case wordchar: | |
b18215fc | 5561 | DEBUG_PRINT1 ("EXECUTING non-Emacs wordchar.\n"); |
fa9a63c5 | 5562 | PREFETCH (); |
b18215fc RS |
5563 | if (!WORDCHAR_P (d)) |
5564 | goto fail; | |
fa9a63c5 | 5565 | SET_REGS_MATCHED (); |
b18215fc | 5566 | d++; |
fa9a63c5 | 5567 | break; |
5e69f11e | 5568 | |
fa9a63c5 | 5569 | case notwordchar: |
b18215fc | 5570 | DEBUG_PRINT1 ("EXECUTING non-Emacs notwordchar.\n"); |
fa9a63c5 RM |
5571 | PREFETCH (); |
5572 | if (WORDCHAR_P (d)) | |
b18215fc RS |
5573 | goto fail; |
5574 | SET_REGS_MATCHED (); | |
5575 | d++; | |
fa9a63c5 RM |
5576 | break; |
5577 | #endif /* not emacs */ | |
5e69f11e | 5578 | |
b18215fc RS |
5579 | default: |
5580 | abort (); | |
fa9a63c5 | 5581 | } |
b18215fc | 5582 | continue; /* Successfully executed one pattern command; keep going. */ |
fa9a63c5 RM |
5583 | |
5584 | ||
5585 | /* We goto here if a matching operation fails. */ | |
5586 | fail: | |
5587 | if (!FAIL_STACK_EMPTY ()) | |
b18215fc RS |
5588 | { /* A restart point is known. Restore to that state. */ |
5589 | DEBUG_PRINT1 ("\nFAIL:\n"); | |
5590 | POP_FAILURE_POINT (d, p, | |
5591 | lowest_active_reg, highest_active_reg, | |
5592 | regstart, regend, reg_info); | |
5593 | ||
5594 | /* If this failure point is a dummy, try the next one. */ | |
5595 | if (!p) | |
fa9a63c5 RM |
5596 | goto fail; |
5597 | ||
b18215fc | 5598 | /* If we failed to the end of the pattern, don't examine *p. */ |
fa9a63c5 | 5599 | assert (p <= pend); |
b18215fc RS |
5600 | if (p < pend) |
5601 | { | |
5602 | boolean is_a_jump_n = false; | |
5603 | ||
5604 | /* If failed to a backwards jump that's part of a repetition | |
5605 | loop, need to pop this failure point and use the next one. */ | |
5606 | switch ((re_opcode_t) *p) | |
5607 | { | |
5608 | case jump_n: | |
5609 | is_a_jump_n = true; | |
5610 | case maybe_pop_jump: | |
5611 | case pop_failure_jump: | |
5612 | case jump: | |
5613 | p1 = p + 1; | |
5614 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); | |
5615 | p1 += mcnt; | |
5616 | ||
5617 | if ((is_a_jump_n && (re_opcode_t) *p1 == succeed_n) | |
5618 | || (!is_a_jump_n | |
5619 | && (re_opcode_t) *p1 == on_failure_jump)) | |
5620 | goto fail; | |
5621 | break; | |
5622 | default: | |
5623 | /* do nothing */ ; | |
5624 | } | |
5625 | } | |
5626 | ||
5627 | if (d >= string1 && d <= end1) | |
fa9a63c5 | 5628 | dend = end_match_1; |
b18215fc | 5629 | } |
fa9a63c5 | 5630 | else |
b18215fc | 5631 | break; /* Matching at this starting point really fails. */ |
fa9a63c5 RM |
5632 | } /* for (;;) */ |
5633 | ||
5634 | if (best_regs_set) | |
5635 | goto restore_best_regs; | |
5636 | ||
5637 | FREE_VARIABLES (); | |
5638 | ||
b18215fc | 5639 | return -1; /* Failure to match. */ |
fa9a63c5 RM |
5640 | } /* re_match_2 */ |
5641 | \f | |
5642 | /* Subroutine definitions for re_match_2. */ | |
5643 | ||
5644 | ||
5645 | /* We are passed P pointing to a register number after a start_memory. | |
5e69f11e | 5646 | |
fa9a63c5 RM |
5647 | Return true if the pattern up to the corresponding stop_memory can |
5648 | match the empty string, and false otherwise. | |
5e69f11e | 5649 | |
fa9a63c5 RM |
5650 | If we find the matching stop_memory, sets P to point to one past its number. |
5651 | Otherwise, sets P to an undefined byte less than or equal to END. | |
5652 | ||
5653 | We don't handle duplicates properly (yet). */ | |
5654 | ||
5655 | static boolean | |
5656 | group_match_null_string_p (p, end, reg_info) | |
5657 | unsigned char **p, *end; | |
5658 | register_info_type *reg_info; | |
5659 | { | |
5660 | int mcnt; | |
5661 | /* Point to after the args to the start_memory. */ | |
5662 | unsigned char *p1 = *p + 2; | |
5e69f11e | 5663 | |
fa9a63c5 RM |
5664 | while (p1 < end) |
5665 | { | |
5666 | /* Skip over opcodes that can match nothing, and return true or | |
5667 | false, as appropriate, when we get to one that can't, or to the | |
b18215fc | 5668 | matching stop_memory. */ |
5e69f11e | 5669 | |
fa9a63c5 | 5670 | switch ((re_opcode_t) *p1) |
b18215fc RS |
5671 | { |
5672 | /* Could be either a loop or a series of alternatives. */ | |
5673 | case on_failure_jump: | |
5674 | p1++; | |
5675 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); | |
5e69f11e | 5676 | |
b18215fc | 5677 | /* If the next operation is not a jump backwards in the |
fa9a63c5 RM |
5678 | pattern. */ |
5679 | ||
5680 | if (mcnt >= 0) | |
5681 | { | |
b18215fc RS |
5682 | /* Go through the on_failure_jumps of the alternatives, |
5683 | seeing if any of the alternatives cannot match nothing. | |
5684 | The last alternative starts with only a jump, | |
5685 | whereas the rest start with on_failure_jump and end | |
5686 | with a jump, e.g., here is the pattern for `a|b|c': | |
fa9a63c5 | 5687 | |
b18215fc RS |
5688 | /on_failure_jump/0/6/exactn/1/a/jump_past_alt/0/6 |
5689 | /on_failure_jump/0/6/exactn/1/b/jump_past_alt/0/3 | |
5690 | /exactn/1/c | |
fa9a63c5 | 5691 | |
b18215fc RS |
5692 | So, we have to first go through the first (n-1) |
5693 | alternatives and then deal with the last one separately. */ | |
fa9a63c5 RM |
5694 | |
5695 | ||
b18215fc RS |
5696 | /* Deal with the first (n-1) alternatives, which start |
5697 | with an on_failure_jump (see above) that jumps to right | |
5698 | past a jump_past_alt. */ | |
fa9a63c5 | 5699 | |
b18215fc RS |
5700 | while ((re_opcode_t) p1[mcnt-3] == jump_past_alt) |
5701 | { | |
5702 | /* `mcnt' holds how many bytes long the alternative | |
5703 | is, including the ending `jump_past_alt' and | |
5704 | its number. */ | |
fa9a63c5 | 5705 | |
b18215fc RS |
5706 | if (!alt_match_null_string_p (p1, p1 + mcnt - 3, |
5707 | reg_info)) | |
5708 | return false; | |
fa9a63c5 | 5709 | |
b18215fc | 5710 | /* Move to right after this alternative, including the |
fa9a63c5 | 5711 | jump_past_alt. */ |
b18215fc | 5712 | p1 += mcnt; |
fa9a63c5 | 5713 | |
b18215fc RS |
5714 | /* Break if it's the beginning of an n-th alternative |
5715 | that doesn't begin with an on_failure_jump. */ | |
5716 | if ((re_opcode_t) *p1 != on_failure_jump) | |
5717 | break; | |
5e69f11e | 5718 | |
fa9a63c5 RM |
5719 | /* Still have to check that it's not an n-th |
5720 | alternative that starts with an on_failure_jump. */ | |
5721 | p1++; | |
b18215fc RS |
5722 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); |
5723 | if ((re_opcode_t) p1[mcnt-3] != jump_past_alt) | |
5724 | { | |
5725 | /* Get to the beginning of the n-th alternative. */ | |
5726 | p1 -= 3; | |
5727 | break; | |
5728 | } | |
5729 | } | |
fa9a63c5 | 5730 | |
b18215fc RS |
5731 | /* Deal with the last alternative: go back and get number |
5732 | of the `jump_past_alt' just before it. `mcnt' contains | |
5733 | the length of the alternative. */ | |
5734 | EXTRACT_NUMBER (mcnt, p1 - 2); | |
fa9a63c5 | 5735 | |
b18215fc RS |
5736 | if (!alt_match_null_string_p (p1, p1 + mcnt, reg_info)) |
5737 | return false; | |
fa9a63c5 | 5738 | |
b18215fc RS |
5739 | p1 += mcnt; /* Get past the n-th alternative. */ |
5740 | } /* if mcnt > 0 */ | |
5741 | break; | |
fa9a63c5 | 5742 | |
5e69f11e | 5743 | |
b18215fc | 5744 | case stop_memory: |
fa9a63c5 | 5745 | assert (p1[1] == **p); |
b18215fc RS |
5746 | *p = p1 + 2; |
5747 | return true; | |
fa9a63c5 | 5748 | |
5e69f11e | 5749 | |
b18215fc RS |
5750 | default: |
5751 | if (!common_op_match_null_string_p (&p1, end, reg_info)) | |
5752 | return false; | |
5753 | } | |
fa9a63c5 RM |
5754 | } /* while p1 < end */ |
5755 | ||
5756 | return false; | |
5757 | } /* group_match_null_string_p */ | |
5758 | ||
5759 | ||
5760 | /* Similar to group_match_null_string_p, but doesn't deal with alternatives: | |
5761 | It expects P to be the first byte of a single alternative and END one | |
5762 | byte past the last. The alternative can contain groups. */ | |
5e69f11e | 5763 | |
fa9a63c5 RM |
5764 | static boolean |
5765 | alt_match_null_string_p (p, end, reg_info) | |
5766 | unsigned char *p, *end; | |
5767 | register_info_type *reg_info; | |
5768 | { | |
5769 | int mcnt; | |
5770 | unsigned char *p1 = p; | |
5e69f11e | 5771 | |
fa9a63c5 RM |
5772 | while (p1 < end) |
5773 | { | |
5e69f11e | 5774 | /* Skip over opcodes that can match nothing, and break when we get |
b18215fc | 5775 | to one that can't. */ |
5e69f11e | 5776 | |
fa9a63c5 | 5777 | switch ((re_opcode_t) *p1) |
b18215fc RS |
5778 | { |
5779 | /* It's a loop. */ | |
5780 | case on_failure_jump: | |
5781 | p1++; | |
5782 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); | |
5783 | p1 += mcnt; | |
5784 | break; | |
5e69f11e RM |
5785 | |
5786 | default: | |
b18215fc RS |
5787 | if (!common_op_match_null_string_p (&p1, end, reg_info)) |
5788 | return false; | |
5789 | } | |
fa9a63c5 RM |
5790 | } /* while p1 < end */ |
5791 | ||
5792 | return true; | |
5793 | } /* alt_match_null_string_p */ | |
5794 | ||
5795 | ||
5796 | /* Deals with the ops common to group_match_null_string_p and | |
5e69f11e RM |
5797 | alt_match_null_string_p. |
5798 | ||
fa9a63c5 RM |
5799 | Sets P to one after the op and its arguments, if any. */ |
5800 | ||
5801 | static boolean | |
5802 | common_op_match_null_string_p (p, end, reg_info) | |
5803 | unsigned char **p, *end; | |
5804 | register_info_type *reg_info; | |
5805 | { | |
5806 | int mcnt; | |
5807 | boolean ret; | |
5808 | int reg_no; | |
5809 | unsigned char *p1 = *p; | |
5810 | ||
5811 | switch ((re_opcode_t) *p1++) | |
5812 | { | |
5813 | case no_op: | |
5814 | case begline: | |
5815 | case endline: | |
5816 | case begbuf: | |
5817 | case endbuf: | |
5818 | case wordbeg: | |
5819 | case wordend: | |
5820 | case wordbound: | |
5821 | case notwordbound: | |
5822 | #ifdef emacs | |
5823 | case before_dot: | |
5824 | case at_dot: | |
5825 | case after_dot: | |
5826 | #endif | |
5827 | break; | |
5828 | ||
5829 | case start_memory: | |
5830 | reg_no = *p1; | |
5831 | assert (reg_no > 0 && reg_no <= MAX_REGNUM); | |
5832 | ret = group_match_null_string_p (&p1, end, reg_info); | |
5e69f11e | 5833 | |
fa9a63c5 | 5834 | /* Have to set this here in case we're checking a group which |
b18215fc | 5835 | contains a group and a back reference to it. */ |
fa9a63c5 RM |
5836 | |
5837 | if (REG_MATCH_NULL_STRING_P (reg_info[reg_no]) == MATCH_NULL_UNSET_VALUE) | |
b18215fc | 5838 | REG_MATCH_NULL_STRING_P (reg_info[reg_no]) = ret; |
fa9a63c5 RM |
5839 | |
5840 | if (!ret) | |
b18215fc | 5841 | return false; |
fa9a63c5 | 5842 | break; |
5e69f11e | 5843 | |
b18215fc | 5844 | /* If this is an optimized succeed_n for zero times, make the jump. */ |
fa9a63c5 RM |
5845 | case jump: |
5846 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); | |
5847 | if (mcnt >= 0) | |
b18215fc | 5848 | p1 += mcnt; |
fa9a63c5 | 5849 | else |
b18215fc | 5850 | return false; |
fa9a63c5 RM |
5851 | break; |
5852 | ||
5853 | case succeed_n: | |
b18215fc | 5854 | /* Get to the number of times to succeed. */ |
5e69f11e | 5855 | p1 += 2; |
fa9a63c5 RM |
5856 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); |
5857 | ||
5858 | if (mcnt == 0) | |
b18215fc RS |
5859 | { |
5860 | p1 -= 4; | |
5861 | EXTRACT_NUMBER_AND_INCR (mcnt, p1); | |
5862 | p1 += mcnt; | |
5863 | } | |
fa9a63c5 | 5864 | else |
b18215fc | 5865 | return false; |
fa9a63c5 RM |
5866 | break; |
5867 | ||
5e69f11e | 5868 | case duplicate: |
fa9a63c5 | 5869 | if (!REG_MATCH_NULL_STRING_P (reg_info[*p1])) |
b18215fc | 5870 | return false; |
fa9a63c5 RM |
5871 | break; |
5872 | ||
5873 | case set_number_at: | |
5874 | p1 += 4; | |
5875 | ||
5876 | default: | |
5877 | /* All other opcodes mean we cannot match the empty string. */ | |
5878 | return false; | |
5879 | } | |
5880 | ||
5881 | *p = p1; | |
5882 | return true; | |
5883 | } /* common_op_match_null_string_p */ | |
5884 | ||
5885 | ||
5886 | /* Return zero if TRANSLATE[S1] and TRANSLATE[S2] are identical for LEN | |
5887 | bytes; nonzero otherwise. */ | |
5e69f11e | 5888 | |
fa9a63c5 RM |
5889 | static int |
5890 | bcmp_translate (s1, s2, len, translate) | |
5891 | unsigned char *s1, *s2; | |
5892 | register int len; | |
6676cb1c | 5893 | RE_TRANSLATE_TYPE translate; |
fa9a63c5 RM |
5894 | { |
5895 | register unsigned char *p1 = s1, *p2 = s2; | |
5896 | while (len) | |
5897 | { | |
bc192b5b RS |
5898 | if (RE_TRANSLATE (translate, *p1++) != RE_TRANSLATE (translate, *p2++)) |
5899 | return 1; | |
fa9a63c5 RM |
5900 | len--; |
5901 | } | |
5902 | return 0; | |
5903 | } | |
5904 | \f | |
5905 | /* Entry points for GNU code. */ | |
5906 | ||
5907 | /* re_compile_pattern is the GNU regular expression compiler: it | |
5908 | compiles PATTERN (of length SIZE) and puts the result in BUFP. | |
5909 | Returns 0 if the pattern was valid, otherwise an error string. | |
5e69f11e | 5910 | |
fa9a63c5 RM |
5911 | Assumes the `allocated' (and perhaps `buffer') and `translate' fields |
5912 | are set in BUFP on entry. | |
5e69f11e | 5913 | |
b18215fc | 5914 | We call regex_compile to do the actual compilation. */ |
fa9a63c5 RM |
5915 | |
5916 | const char * | |
5917 | re_compile_pattern (pattern, length, bufp) | |
5918 | const char *pattern; | |
5919 | int length; | |
5920 | struct re_pattern_buffer *bufp; | |
5921 | { | |
5922 | reg_errcode_t ret; | |
5e69f11e | 5923 | |
fa9a63c5 RM |
5924 | /* GNU code is written to assume at least RE_NREGS registers will be set |
5925 | (and at least one extra will be -1). */ | |
5926 | bufp->regs_allocated = REGS_UNALLOCATED; | |
5e69f11e | 5927 | |
fa9a63c5 RM |
5928 | /* And GNU code determines whether or not to get register information |
5929 | by passing null for the REGS argument to re_match, etc., not by | |
5930 | setting no_sub. */ | |
5931 | bufp->no_sub = 0; | |
5e69f11e | 5932 | |
b18215fc | 5933 | /* Match anchors at newline. */ |
fa9a63c5 | 5934 | bufp->newline_anchor = 1; |
5e69f11e | 5935 | |
fa9a63c5 RM |
5936 | ret = regex_compile (pattern, length, re_syntax_options, bufp); |
5937 | ||
5938 | if (!ret) | |
5939 | return NULL; | |
5940 | return gettext (re_error_msgid[(int) ret]); | |
5e69f11e | 5941 | } |
fa9a63c5 | 5942 | \f |
b18215fc RS |
5943 | /* Entry points compatible with 4.2 BSD regex library. We don't define |
5944 | them unless specifically requested. */ | |
fa9a63c5 | 5945 | |
0c085854 | 5946 | #if defined (_REGEX_RE_COMP) || defined (_LIBC) |
fa9a63c5 RM |
5947 | |
5948 | /* BSD has one and only one pattern buffer. */ | |
5949 | static struct re_pattern_buffer re_comp_buf; | |
5950 | ||
5951 | char * | |
48afdd44 RM |
5952 | #ifdef _LIBC |
5953 | /* Make these definitions weak in libc, so POSIX programs can redefine | |
5954 | these names if they don't use our functions, and still use | |
5955 | regcomp/regexec below without link errors. */ | |
5956 | weak_function | |
5957 | #endif | |
fa9a63c5 RM |
5958 | re_comp (s) |
5959 | const char *s; | |
5960 | { | |
5961 | reg_errcode_t ret; | |
5e69f11e | 5962 | |
fa9a63c5 RM |
5963 | if (!s) |
5964 | { | |
5965 | if (!re_comp_buf.buffer) | |
5966 | return gettext ("No previous regular expression"); | |
5967 | return 0; | |
5968 | } | |
5969 | ||
5970 | if (!re_comp_buf.buffer) | |
5971 | { | |
5972 | re_comp_buf.buffer = (unsigned char *) malloc (200); | |
5973 | if (re_comp_buf.buffer == NULL) | |
b18215fc | 5974 | return gettext (re_error_msgid[(int) REG_ESPACE]); |
fa9a63c5 RM |
5975 | re_comp_buf.allocated = 200; |
5976 | ||
5977 | re_comp_buf.fastmap = (char *) malloc (1 << BYTEWIDTH); | |
5978 | if (re_comp_buf.fastmap == NULL) | |
5979 | return gettext (re_error_msgid[(int) REG_ESPACE]); | |
5980 | } | |
5981 | ||
5982 | /* Since `re_exec' always passes NULL for the `regs' argument, we | |
5983 | don't need to initialize the pattern buffer fields which affect it. */ | |
5984 | ||
b18215fc | 5985 | /* Match anchors at newlines. */ |
fa9a63c5 RM |
5986 | re_comp_buf.newline_anchor = 1; |
5987 | ||
5988 | ret = regex_compile (s, strlen (s), re_syntax_options, &re_comp_buf); | |
5e69f11e | 5989 | |
fa9a63c5 RM |
5990 | if (!ret) |
5991 | return NULL; | |
5992 | ||
5993 | /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */ | |
5994 | return (char *) gettext (re_error_msgid[(int) ret]); | |
5995 | } | |
5996 | ||
5997 | ||
5998 | int | |
48afdd44 RM |
5999 | #ifdef _LIBC |
6000 | weak_function | |
6001 | #endif | |
fa9a63c5 RM |
6002 | re_exec (s) |
6003 | const char *s; | |
6004 | { | |
6005 | const int len = strlen (s); | |
6006 | return | |
6007 | 0 <= re_search (&re_comp_buf, s, len, 0, len, (struct re_registers *) 0); | |
6008 | } | |
6009 | #endif /* _REGEX_RE_COMP */ | |
6010 | \f | |
6011 | /* POSIX.2 functions. Don't define these for Emacs. */ | |
6012 | ||
6013 | #ifndef emacs | |
6014 | ||
6015 | /* regcomp takes a regular expression as a string and compiles it. | |
6016 | ||
b18215fc | 6017 | PREG is a regex_t *. We do not expect any fields to be initialized, |
fa9a63c5 RM |
6018 | since POSIX says we shouldn't. Thus, we set |
6019 | ||
6020 | `buffer' to the compiled pattern; | |
6021 | `used' to the length of the compiled pattern; | |
6022 | `syntax' to RE_SYNTAX_POSIX_EXTENDED if the | |
6023 | REG_EXTENDED bit in CFLAGS is set; otherwise, to | |
6024 | RE_SYNTAX_POSIX_BASIC; | |
6025 | `newline_anchor' to REG_NEWLINE being set in CFLAGS; | |
6026 | `fastmap' and `fastmap_accurate' to zero; | |
6027 | `re_nsub' to the number of subexpressions in PATTERN. | |
6028 | ||
6029 | PATTERN is the address of the pattern string. | |
6030 | ||
6031 | CFLAGS is a series of bits which affect compilation. | |
6032 | ||
6033 | If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we | |
6034 | use POSIX basic syntax. | |
6035 | ||
6036 | If REG_NEWLINE is set, then . and [^...] don't match newline. | |
6037 | Also, regexec will try a match beginning after every newline. | |
6038 | ||
6039 | If REG_ICASE is set, then we considers upper- and lowercase | |
6040 | versions of letters to be equivalent when matching. | |
6041 | ||
6042 | If REG_NOSUB is set, then when PREG is passed to regexec, that | |
6043 | routine will report only success or failure, and nothing about the | |
6044 | registers. | |
6045 | ||
b18215fc | 6046 | It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for |
fa9a63c5 RM |
6047 | the return codes and their meanings.) */ |
6048 | ||
6049 | int | |
6050 | regcomp (preg, pattern, cflags) | |
6051 | regex_t *preg; | |
5e69f11e | 6052 | const char *pattern; |
fa9a63c5 RM |
6053 | int cflags; |
6054 | { | |
6055 | reg_errcode_t ret; | |
6056 | unsigned syntax | |
6057 | = (cflags & REG_EXTENDED) ? | |
6058 | RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC; | |
6059 | ||
6060 | /* regex_compile will allocate the space for the compiled pattern. */ | |
6061 | preg->buffer = 0; | |
6062 | preg->allocated = 0; | |
6063 | preg->used = 0; | |
5e69f11e | 6064 | |
fa9a63c5 RM |
6065 | /* Don't bother to use a fastmap when searching. This simplifies the |
6066 | REG_NEWLINE case: if we used a fastmap, we'd have to put all the | |
6067 | characters after newlines into the fastmap. This way, we just try | |
6068 | every character. */ | |
6069 | preg->fastmap = 0; | |
5e69f11e | 6070 | |
fa9a63c5 RM |
6071 | if (cflags & REG_ICASE) |
6072 | { | |
6073 | unsigned i; | |
5e69f11e | 6074 | |
6676cb1c RS |
6075 | preg->translate |
6076 | = (RE_TRANSLATE_TYPE) malloc (CHAR_SET_SIZE | |
6077 | * sizeof (*(RE_TRANSLATE_TYPE)0)); | |
fa9a63c5 | 6078 | if (preg->translate == NULL) |
b18215fc | 6079 | return (int) REG_ESPACE; |
fa9a63c5 RM |
6080 | |
6081 | /* Map uppercase characters to corresponding lowercase ones. */ | |
6082 | for (i = 0; i < CHAR_SET_SIZE; i++) | |
b18215fc | 6083 | preg->translate[i] = ISUPPER (i) ? tolower (i) : i; |
fa9a63c5 RM |
6084 | } |
6085 | else | |
6086 | preg->translate = NULL; | |
6087 | ||
6088 | /* If REG_NEWLINE is set, newlines are treated differently. */ | |
6089 | if (cflags & REG_NEWLINE) | |
6090 | { /* REG_NEWLINE implies neither . nor [^...] match newline. */ | |
6091 | syntax &= ~RE_DOT_NEWLINE; | |
6092 | syntax |= RE_HAT_LISTS_NOT_NEWLINE; | |
b18215fc | 6093 | /* It also changes the matching behavior. */ |
fa9a63c5 RM |
6094 | preg->newline_anchor = 1; |
6095 | } | |
6096 | else | |
6097 | preg->newline_anchor = 0; | |
6098 | ||
6099 | preg->no_sub = !!(cflags & REG_NOSUB); | |
6100 | ||
5e69f11e | 6101 | /* POSIX says a null character in the pattern terminates it, so we |
fa9a63c5 RM |
6102 | can use strlen here in compiling the pattern. */ |
6103 | ret = regex_compile (pattern, strlen (pattern), syntax, preg); | |
5e69f11e | 6104 | |
fa9a63c5 RM |
6105 | /* POSIX doesn't distinguish between an unmatched open-group and an |
6106 | unmatched close-group: both are REG_EPAREN. */ | |
6107 | if (ret == REG_ERPAREN) ret = REG_EPAREN; | |
5e69f11e | 6108 | |
fa9a63c5 RM |
6109 | return (int) ret; |
6110 | } | |
6111 | ||
6112 | ||
6113 | /* regexec searches for a given pattern, specified by PREG, in the | |
6114 | string STRING. | |
5e69f11e | 6115 | |
fa9a63c5 | 6116 | If NMATCH is zero or REG_NOSUB was set in the cflags argument to |
b18215fc | 6117 | `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at |
fa9a63c5 RM |
6118 | least NMATCH elements, and we set them to the offsets of the |
6119 | corresponding matched substrings. | |
5e69f11e | 6120 | |
fa9a63c5 RM |
6121 | EFLAGS specifies `execution flags' which affect matching: if |
6122 | REG_NOTBOL is set, then ^ does not match at the beginning of the | |
6123 | string; if REG_NOTEOL is set, then $ does not match at the end. | |
5e69f11e | 6124 | |
fa9a63c5 RM |
6125 | We return 0 if we find a match and REG_NOMATCH if not. */ |
6126 | ||
6127 | int | |
6128 | regexec (preg, string, nmatch, pmatch, eflags) | |
6129 | const regex_t *preg; | |
5e69f11e RM |
6130 | const char *string; |
6131 | size_t nmatch; | |
6132 | regmatch_t pmatch[]; | |
fa9a63c5 RM |
6133 | int eflags; |
6134 | { | |
6135 | int ret; | |
6136 | struct re_registers regs; | |
6137 | regex_t private_preg; | |
6138 | int len = strlen (string); | |
6139 | boolean want_reg_info = !preg->no_sub && nmatch > 0; | |
6140 | ||
6141 | private_preg = *preg; | |
5e69f11e | 6142 | |
fa9a63c5 RM |
6143 | private_preg.not_bol = !!(eflags & REG_NOTBOL); |
6144 | private_preg.not_eol = !!(eflags & REG_NOTEOL); | |
5e69f11e | 6145 | |
fa9a63c5 RM |
6146 | /* The user has told us exactly how many registers to return |
6147 | information about, via `nmatch'. We have to pass that on to the | |
b18215fc | 6148 | matching routines. */ |
fa9a63c5 | 6149 | private_preg.regs_allocated = REGS_FIXED; |
5e69f11e | 6150 | |
fa9a63c5 RM |
6151 | if (want_reg_info) |
6152 | { | |
6153 | regs.num_regs = nmatch; | |
6154 | regs.start = TALLOC (nmatch, regoff_t); | |
6155 | regs.end = TALLOC (nmatch, regoff_t); | |
6156 | if (regs.start == NULL || regs.end == NULL) | |
b18215fc | 6157 | return (int) REG_NOMATCH; |
fa9a63c5 RM |
6158 | } |
6159 | ||
6160 | /* Perform the searching operation. */ | |
6161 | ret = re_search (&private_preg, string, len, | |
b18215fc RS |
6162 | /* start: */ 0, /* range: */ len, |
6163 | want_reg_info ? ®s : (struct re_registers *) 0); | |
5e69f11e | 6164 | |
fa9a63c5 RM |
6165 | /* Copy the register information to the POSIX structure. */ |
6166 | if (want_reg_info) | |
6167 | { | |
6168 | if (ret >= 0) | |
b18215fc RS |
6169 | { |
6170 | unsigned r; | |
fa9a63c5 | 6171 | |
b18215fc RS |
6172 | for (r = 0; r < nmatch; r++) |
6173 | { | |
6174 | pmatch[r].rm_so = regs.start[r]; | |
6175 | pmatch[r].rm_eo = regs.end[r]; | |
6176 | } | |
6177 | } | |
fa9a63c5 | 6178 | |
b18215fc | 6179 | /* If we needed the temporary register info, free the space now. */ |
fa9a63c5 RM |
6180 | free (regs.start); |
6181 | free (regs.end); | |
6182 | } | |
6183 | ||
6184 | /* We want zero return to mean success, unlike `re_search'. */ | |
6185 | return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH; | |
6186 | } | |
6187 | ||
6188 | ||
6189 | /* Returns a message corresponding to an error code, ERRCODE, returned | |
6190 | from either regcomp or regexec. We don't use PREG here. */ | |
6191 | ||
6192 | size_t | |
6193 | regerror (errcode, preg, errbuf, errbuf_size) | |
6194 | int errcode; | |
6195 | const regex_t *preg; | |
6196 | char *errbuf; | |
6197 | size_t errbuf_size; | |
6198 | { | |
6199 | const char *msg; | |
6200 | size_t msg_size; | |
6201 | ||
6202 | if (errcode < 0 | |
6203 | || errcode >= (sizeof (re_error_msgid) / sizeof (re_error_msgid[0]))) | |
5e69f11e | 6204 | /* Only error codes returned by the rest of the code should be passed |
b18215fc | 6205 | to this routine. If we are given anything else, or if other regex |
fa9a63c5 RM |
6206 | code generates an invalid error code, then the program has a bug. |
6207 | Dump core so we can fix it. */ | |
6208 | abort (); | |
6209 | ||
6210 | msg = gettext (re_error_msgid[errcode]); | |
6211 | ||
6212 | msg_size = strlen (msg) + 1; /* Includes the null. */ | |
5e69f11e | 6213 | |
fa9a63c5 RM |
6214 | if (errbuf_size != 0) |
6215 | { | |
6216 | if (msg_size > errbuf_size) | |
b18215fc RS |
6217 | { |
6218 | strncpy (errbuf, msg, errbuf_size - 1); | |
6219 | errbuf[errbuf_size - 1] = 0; | |
6220 | } | |
fa9a63c5 | 6221 | else |
b18215fc | 6222 | strcpy (errbuf, msg); |
fa9a63c5 RM |
6223 | } |
6224 | ||
6225 | return msg_size; | |
6226 | } | |
6227 | ||
6228 | ||
6229 | /* Free dynamically allocated space used by PREG. */ | |
6230 | ||
6231 | void | |
6232 | regfree (preg) | |
6233 | regex_t *preg; | |
6234 | { | |
6235 | if (preg->buffer != NULL) | |
6236 | free (preg->buffer); | |
6237 | preg->buffer = NULL; | |
5e69f11e | 6238 | |
fa9a63c5 RM |
6239 | preg->allocated = 0; |
6240 | preg->used = 0; | |
6241 | ||
6242 | if (preg->fastmap != NULL) | |
6243 | free (preg->fastmap); | |
6244 | preg->fastmap = NULL; | |
6245 | preg->fastmap_accurate = 0; | |
6246 | ||
6247 | if (preg->translate != NULL) | |
6248 | free (preg->translate); | |
6249 | preg->translate = NULL; | |
6250 | } | |
6251 | ||
6252 | #endif /* not emacs */ |