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e318085a RS |
1 | /* Extended regular expression matching and search library, version |
2 | 0.12. (Implements POSIX draft P10003.2/D11.2, except for | |
bc78d348 KB |
3 | internationalization features.) |
4 | ||
505bde11 | 5 | Copyright (C) 1993,94,95,96,97,98,2000 Free Software Foundation, Inc. |
bc78d348 | 6 | |
fa9a63c5 RM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25fe55af | 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
fa9a63c5 RM |
15 | GNU General Public License for more details. |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
ba4a8e51 | 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
25fe55af | 20 | USA. */ |
fa9a63c5 | 21 | |
505bde11 | 22 | /* TODO: |
505bde11 | 23 | - structure the opcode space into opcode+flag. |
f6a3f532 SM |
24 | - merge with glibc's regex.[ch] |
25 | */ | |
505bde11 | 26 | |
fa9a63c5 RM |
27 | /* AIX requires this to be the first thing in the file. */ |
28 | #if defined (_AIX) && !defined (REGEX_MALLOC) | |
29 | #pragma alloca | |
30 | #endif | |
31 | ||
68d96f02 | 32 | #undef _GNU_SOURCE |
fa9a63c5 RM |
33 | #define _GNU_SOURCE |
34 | ||
51352796 | 35 | #ifdef emacs |
25fe55af | 36 | /* Converts the pointer to the char to BEG-based offset from the start. */ |
99633e97 | 37 | #define PTR_TO_OFFSET(d) POS_AS_IN_BUFFER (POINTER_TO_OFFSET (d)) |
7e95234e | 38 | #define POS_AS_IN_BUFFER(p) ((p) + (NILP (re_match_object) || BUFFERP (re_match_object))) |
51352796 | 39 | #endif |
b18215fc | 40 | |
fa9a63c5 RM |
41 | #ifdef HAVE_CONFIG_H |
42 | #include <config.h> | |
43 | #endif | |
44 | ||
25fe55af | 45 | /* We need this for `regex.h', and perhaps for the Emacs include files. */ |
fa9a63c5 RM |
46 | #include <sys/types.h> |
47 | ||
25fe55af | 48 | /* This is for other GNU distributions with internationalized messages. */ |
fa9a63c5 RM |
49 | #if HAVE_LIBINTL_H || defined (_LIBC) |
50 | # include <libintl.h> | |
51 | #else | |
52 | # define gettext(msgid) (msgid) | |
53 | #endif | |
54 | ||
5e69f11e RM |
55 | #ifndef gettext_noop |
56 | /* This define is so xgettext can find the internationalizable | |
57 | strings. */ | |
58 | #define gettext_noop(String) String | |
59 | #endif | |
60 | ||
fa9a63c5 RM |
61 | /* The `emacs' switch turns on certain matching commands |
62 | that make sense only in Emacs. */ | |
63 | #ifdef emacs | |
64 | ||
65 | #include "lisp.h" | |
66 | #include "buffer.h" | |
b18215fc RS |
67 | |
68 | /* Make syntax table lookup grant data in gl_state. */ | |
69 | #define SYNTAX_ENTRY_VIA_PROPERTY | |
70 | ||
fa9a63c5 | 71 | #include "syntax.h" |
b18215fc RS |
72 | #include "charset.h" |
73 | #include "category.h" | |
fa9a63c5 | 74 | |
9abbd165 | 75 | #define malloc xmalloc |
64e3c718 | 76 | #define realloc xrealloc |
9abbd165 RS |
77 | #define free xfree |
78 | ||
2d1675e4 | 79 | #define RE_MULTIBYTE_P(bufp) ((bufp)->multibyte) |
4e8a9132 SM |
80 | #define RE_STRING_CHAR(p, s) \ |
81 | (multibyte ? (STRING_CHAR (p, s)) : (*(p))) | |
2d1675e4 SM |
82 | #define RE_STRING_CHAR_AND_LENGTH(p, s, len) \ |
83 | (multibyte ? (STRING_CHAR_AND_LENGTH (p, s, len)) : ((len) = 1, *(p))) | |
84 | ||
85 | /* Set C a (possibly multibyte) character before P. P points into a | |
86 | string which is the virtual concatenation of STR1 (which ends at | |
87 | END1) or STR2 (which ends at END2). */ | |
88 | #define GET_CHAR_BEFORE_2(c, p, str1, end1, str2, end2) \ | |
89 | do { \ | |
90 | if (multibyte) \ | |
91 | { \ | |
92 | re_char *dtemp = (p) == (str2) ? (end1) : (p); \ | |
93 | re_char *dlimit = ((p) > (str2) && (p) <= (end2)) ? (str2) : (str1); \ | |
94 | while (dtemp-- > dlimit && !CHAR_HEAD_P (*dtemp)); \ | |
95 | c = STRING_CHAR (dtemp, (p) - dtemp); \ | |
96 | } \ | |
97 | else \ | |
98 | (c = ((p) == (str2) ? (end1) : (p))[-1]); \ | |
99 | } while (0) | |
100 | ||
4e8a9132 | 101 | |
fa9a63c5 RM |
102 | #else /* not emacs */ |
103 | ||
104 | /* If we are not linking with Emacs proper, | |
105 | we can't use the relocating allocator | |
106 | even if config.h says that we can. */ | |
107 | #undef REL_ALLOC | |
108 | ||
109 | #if defined (STDC_HEADERS) || defined (_LIBC) | |
110 | #include <stdlib.h> | |
111 | #else | |
112 | char *malloc (); | |
113 | char *realloc (); | |
114 | #endif | |
115 | ||
9e4ecb26 | 116 | /* When used in Emacs's lib-src, we need to get bzero and bcopy somehow. |
25fe55af | 117 | If nothing else has been done, use the method below. */ |
9e4ecb26 KH |
118 | #ifdef INHIBIT_STRING_HEADER |
119 | #if !(defined (HAVE_BZERO) && defined (HAVE_BCOPY)) | |
120 | #if !defined (bzero) && !defined (bcopy) | |
121 | #undef INHIBIT_STRING_HEADER | |
122 | #endif | |
123 | #endif | |
124 | #endif | |
125 | ||
126 | /* This is the normal way of making sure we have a bcopy and a bzero. | |
127 | This is used in most programs--a few other programs avoid this | |
128 | by defining INHIBIT_STRING_HEADER. */ | |
fa9a63c5 | 129 | #ifndef INHIBIT_STRING_HEADER |
7f998252 | 130 | #if defined (HAVE_STRING_H) || defined (STDC_HEADERS) || defined (_LIBC) |
fa9a63c5 RM |
131 | #include <string.h> |
132 | #ifndef bcmp | |
133 | #define bcmp(s1, s2, n) memcmp ((s1), (s2), (n)) | |
134 | #endif | |
135 | #ifndef bcopy | |
136 | #define bcopy(s, d, n) memcpy ((d), (s), (n)) | |
137 | #endif | |
138 | #ifndef bzero | |
139 | #define bzero(s, n) memset ((s), 0, (n)) | |
140 | #endif | |
141 | #else | |
142 | #include <strings.h> | |
143 | #endif | |
144 | #endif | |
145 | ||
146 | /* Define the syntax stuff for \<, \>, etc. */ | |
147 | ||
990b2375 SM |
148 | /* Sword must be nonzero for the wordchar pattern commands in re_match_2. */ |
149 | enum syntaxcode { Swhitespace = 0, Sword = 1 }; | |
fa9a63c5 RM |
150 | |
151 | #ifdef SWITCH_ENUM_BUG | |
152 | #define SWITCH_ENUM_CAST(x) ((int)(x)) | |
153 | #else | |
154 | #define SWITCH_ENUM_CAST(x) (x) | |
155 | #endif | |
156 | ||
157 | #ifdef SYNTAX_TABLE | |
158 | ||
159 | extern char *re_syntax_table; | |
160 | ||
161 | #else /* not SYNTAX_TABLE */ | |
162 | ||
163 | /* How many characters in the character set. */ | |
164 | #define CHAR_SET_SIZE 256 | |
165 | ||
166 | static char re_syntax_table[CHAR_SET_SIZE]; | |
167 | ||
168 | static void | |
169 | init_syntax_once () | |
170 | { | |
171 | register int c; | |
172 | static int done = 0; | |
173 | ||
174 | if (done) | |
175 | return; | |
176 | ||
177 | bzero (re_syntax_table, sizeof re_syntax_table); | |
178 | ||
179 | for (c = 'a'; c <= 'z'; c++) | |
180 | re_syntax_table[c] = Sword; | |
181 | ||
182 | for (c = 'A'; c <= 'Z'; c++) | |
183 | re_syntax_table[c] = Sword; | |
184 | ||
185 | for (c = '0'; c <= '9'; c++) | |
186 | re_syntax_table[c] = Sword; | |
187 | ||
188 | re_syntax_table['_'] = Sword; | |
189 | ||
190 | done = 1; | |
191 | } | |
192 | ||
193 | #endif /* not SYNTAX_TABLE */ | |
194 | ||
195 | #define SYNTAX(c) re_syntax_table[c] | |
196 | ||
e934739e | 197 | /* Dummy macros for non-Emacs environments. */ |
b18215fc | 198 | #define BASE_LEADING_CODE_P(c) (0) |
1fb352e0 SM |
199 | #define CHAR_CHARSET(c) 0 |
200 | #define CHARSET_LEADING_CODE_BASE(c) 0 | |
2d1675e4 SM |
201 | #define MAX_MULTIBYTE_LENGTH 1 |
202 | #define RE_MULTIBYTE_P(x) 0 | |
b18215fc RS |
203 | #define WORD_BOUNDARY_P(c1, c2) (0) |
204 | #define CHAR_HEAD_P(p) (1) | |
205 | #define SINGLE_BYTE_CHAR_P(c) (1) | |
206 | #define SAME_CHARSET_P(c1, c2) (1) | |
207 | #define MULTIBYTE_FORM_LENGTH(p, s) (1) | |
208 | #define STRING_CHAR(p, s) (*(p)) | |
4e8a9132 | 209 | #define RE_STRING_CHAR STRING_CHAR |
2d1675e4 | 210 | #define CHAR_STRING(c, s) (*(s) = (c), 1) |
b18215fc | 211 | #define STRING_CHAR_AND_LENGTH(p, s, actual_len) ((actual_len) = 1, *(p)) |
2d1675e4 | 212 | #define RE_STRING_CHAR_AND_LENGTH STRING_CHAR_AND_LENGTH |
b18215fc RS |
213 | #define GET_CHAR_BEFORE_2(c, p, str1, end1, str2, end2) \ |
214 | (c = ((p) == (str2) ? *((end1) - 1) : *((p) - 1))) | |
b54f61ed | 215 | #define MAKE_CHAR(charset, c1, c2) (c1) |
fa9a63c5 | 216 | #endif /* not emacs */ |
4e8a9132 SM |
217 | |
218 | #ifndef RE_TRANSLATE | |
219 | #define RE_TRANSLATE(TBL, C) ((unsigned char)(TBL)[C]) | |
220 | #define RE_TRANSLATE_P(TBL) (TBL) | |
221 | #endif | |
fa9a63c5 RM |
222 | \f |
223 | /* Get the interface, including the syntax bits. */ | |
224 | #include "regex.h" | |
225 | ||
f71b19b6 DL |
226 | /* isalpha etc. are used for the character classes. */ |
227 | #include <ctype.h> | |
fa9a63c5 | 228 | |
f71b19b6 | 229 | #ifdef emacs |
fa9a63c5 | 230 | |
f71b19b6 DL |
231 | /* 1 if C is an ASCII character. */ |
232 | #define IS_REAL_ASCII(c) ((c) < 0200) | |
fa9a63c5 | 233 | |
f71b19b6 DL |
234 | /* 1 if C is a unibyte character. */ |
235 | #define ISUNIBYTE(c) (SINGLE_BYTE_CHAR_P ((c))) | |
96cc36cc | 236 | |
f71b19b6 | 237 | /* The Emacs definitions should not be directly affected by locales. */ |
96cc36cc | 238 | |
f71b19b6 DL |
239 | /* In Emacs, these are only used for single-byte characters. */ |
240 | #define ISDIGIT(c) ((c) >= '0' && (c) <= '9') | |
241 | #define ISCNTRL(c) ((c) < ' ') | |
242 | #define ISXDIGIT(c) (((c) >= '0' && (c) <= '9') \ | |
243 | || ((c) >= 'a' && (c) <= 'f') \ | |
244 | || ((c) >= 'A' && (c) <= 'F')) | |
96cc36cc RS |
245 | |
246 | /* This is only used for single-byte characters. */ | |
247 | #define ISBLANK(c) ((c) == ' ' || (c) == '\t') | |
248 | ||
249 | /* The rest must handle multibyte characters. */ | |
250 | ||
251 | #define ISGRAPH(c) (SINGLE_BYTE_CHAR_P (c) \ | |
f71b19b6 | 252 | ? (c) > ' ' && !((c) >= 0177 && (c) <= 0237) \ |
96cc36cc RS |
253 | : 1) |
254 | ||
255 | #define ISPRINT(c) (SINGLE_BYTE_CHAR_P (c) \ | |
f71b19b6 | 256 | ? (c) >= ' ' && !((c) >= 0177 && (c) <= 0237) \ |
96cc36cc RS |
257 | : 1) |
258 | ||
f71b19b6 DL |
259 | #define ISALNUM(c) (IS_REAL_ASCII (c) \ |
260 | ? (((c) >= 'a' && (c) <= 'z') \ | |
261 | || ((c) >= 'A' && (c) <= 'Z') \ | |
262 | || ((c) >= '0' && (c) <= '9')) \ | |
96cc36cc RS |
263 | : SYNTAX (c) == Sword) |
264 | ||
f71b19b6 DL |
265 | #define ISALPHA(c) (IS_REAL_ASCII (c) \ |
266 | ? (((c) >= 'a' && (c) <= 'z') \ | |
267 | || ((c) >= 'A' && (c) <= 'Z')) \ | |
96cc36cc RS |
268 | : SYNTAX (c) == Sword) |
269 | ||
270 | #define ISLOWER(c) (LOWERCASEP (c)) | |
271 | ||
f71b19b6 DL |
272 | #define ISPUNCT(c) (IS_REAL_ASCII (c) \ |
273 | ? ((c) > ' ' && (c) < 0177 \ | |
274 | && !(((c) >= 'a' && (c) <= 'z') \ | |
275 | || ((c) >= 'A' && (c) <= 'Z') \ | |
276 | || ((c) >= '0' && (c) <= '9'))) \ | |
96cc36cc RS |
277 | : SYNTAX (c) != Sword) |
278 | ||
279 | #define ISSPACE(c) (SYNTAX (c) == Swhitespace) | |
280 | ||
281 | #define ISUPPER(c) (UPPERCASEP (c)) | |
282 | ||
283 | #define ISWORD(c) (SYNTAX (c) == Sword) | |
284 | ||
285 | #else /* not emacs */ | |
286 | ||
f71b19b6 DL |
287 | /* Jim Meyering writes: |
288 | ||
289 | "... Some ctype macros are valid only for character codes that | |
290 | isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when | |
291 | using /bin/cc or gcc but without giving an ansi option). So, all | |
292 | ctype uses should be through macros like ISPRINT... If | |
293 | STDC_HEADERS is defined, then autoconf has verified that the ctype | |
294 | macros don't need to be guarded with references to isascii. ... | |
295 | Defining isascii to 1 should let any compiler worth its salt | |
296 | eliminate the && through constant folding." */ | |
297 | ||
298 | #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) | |
299 | #define ISASCII(c) 1 | |
300 | #else | |
301 | #define ISASCII(c) isascii(c) | |
302 | #endif | |
303 | ||
304 | /* 1 if C is an ASCII character. */ | |
305 | #define IS_REAL_ASCII(c) ((c) < 0200) | |
306 | ||
307 | /* This distinction is not meaningful, except in Emacs. */ | |
308 | #define ISUNIBYTE(c) 1 | |
309 | ||
310 | #define ISDIGIT(c) (ISASCII (c) && isdigit (c)) | |
311 | #define ISCNTRL(c) (ISASCII (c) && iscntrl (c)) | |
312 | #define ISXDIGIT(c) (ISASCII (c) && isxdigit (c)) | |
313 | ||
fa9a63c5 RM |
314 | #ifdef isblank |
315 | #define ISBLANK(c) (ISASCII (c) && isblank (c)) | |
316 | #else | |
317 | #define ISBLANK(c) ((c) == ' ' || (c) == '\t') | |
318 | #endif | |
319 | #ifdef isgraph | |
320 | #define ISGRAPH(c) (ISASCII (c) && isgraph (c)) | |
321 | #else | |
322 | #define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c)) | |
323 | #endif | |
324 | ||
325 | #define ISPRINT(c) (ISASCII (c) && isprint (c)) | |
326 | #define ISDIGIT(c) (ISASCII (c) && isdigit (c)) | |
327 | #define ISALNUM(c) (ISASCII (c) && isalnum (c)) | |
328 | #define ISALPHA(c) (ISASCII (c) && isalpha (c)) | |
329 | #define ISCNTRL(c) (ISASCII (c) && iscntrl (c)) | |
330 | #define ISLOWER(c) (ISASCII (c) && islower (c)) | |
331 | #define ISPUNCT(c) (ISASCII (c) && ispunct (c)) | |
332 | #define ISSPACE(c) (ISASCII (c) && isspace (c)) | |
333 | #define ISUPPER(c) (ISASCII (c) && isupper (c)) | |
334 | #define ISXDIGIT(c) (ISASCII (c) && isxdigit (c)) | |
335 | ||
96cc36cc RS |
336 | #define ISWORD(c) ISALPHA(c) |
337 | ||
338 | #endif /* not emacs */ | |
339 | \f | |
fa9a63c5 | 340 | #ifndef NULL |
075f06ec | 341 | #define NULL (void *)0 |
fa9a63c5 RM |
342 | #endif |
343 | ||
344 | /* We remove any previous definition of `SIGN_EXTEND_CHAR', | |
345 | since ours (we hope) works properly with all combinations of | |
346 | machines, compilers, `char' and `unsigned char' argument types. | |
25fe55af | 347 | (Per Bothner suggested the basic approach.) */ |
fa9a63c5 RM |
348 | #undef SIGN_EXTEND_CHAR |
349 | #if __STDC__ | |
350 | #define SIGN_EXTEND_CHAR(c) ((signed char) (c)) | |
351 | #else /* not __STDC__ */ | |
352 | /* As in Harbison and Steele. */ | |
353 | #define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128) | |
354 | #endif | |
355 | \f | |
356 | /* Should we use malloc or alloca? If REGEX_MALLOC is not defined, we | |
357 | use `alloca' instead of `malloc'. This is because using malloc in | |
358 | re_search* or re_match* could cause memory leaks when C-g is used in | |
359 | Emacs; also, malloc is slower and causes storage fragmentation. On | |
5e69f11e RM |
360 | the other hand, malloc is more portable, and easier to debug. |
361 | ||
fa9a63c5 RM |
362 | Because we sometimes use alloca, some routines have to be macros, |
363 | not functions -- `alloca'-allocated space disappears at the end of the | |
364 | function it is called in. */ | |
365 | ||
366 | #ifdef REGEX_MALLOC | |
367 | ||
368 | #define REGEX_ALLOCATE malloc | |
369 | #define REGEX_REALLOCATE(source, osize, nsize) realloc (source, nsize) | |
370 | #define REGEX_FREE free | |
371 | ||
372 | #else /* not REGEX_MALLOC */ | |
373 | ||
374 | /* Emacs already defines alloca, sometimes. */ | |
375 | #ifndef alloca | |
376 | ||
377 | /* Make alloca work the best possible way. */ | |
378 | #ifdef __GNUC__ | |
379 | #define alloca __builtin_alloca | |
380 | #else /* not __GNUC__ */ | |
381 | #if HAVE_ALLOCA_H | |
382 | #include <alloca.h> | |
383 | #else /* not __GNUC__ or HAVE_ALLOCA_H */ | |
f3c4387f | 384 | #if 0 /* It is a bad idea to declare alloca. We always cast the result. */ |
25fe55af | 385 | #ifndef _AIX /* Already did AIX, up at the top. */ |
fa9a63c5 RM |
386 | char *alloca (); |
387 | #endif /* not _AIX */ | |
f3c4387f | 388 | #endif |
5e69f11e | 389 | #endif /* not HAVE_ALLOCA_H */ |
fa9a63c5 RM |
390 | #endif /* not __GNUC__ */ |
391 | ||
392 | #endif /* not alloca */ | |
393 | ||
394 | #define REGEX_ALLOCATE alloca | |
395 | ||
396 | /* Assumes a `char *destination' variable. */ | |
397 | #define REGEX_REALLOCATE(source, osize, nsize) \ | |
398 | (destination = (char *) alloca (nsize), \ | |
399 | bcopy (source, destination, osize), \ | |
400 | destination) | |
401 | ||
402 | /* No need to do anything to free, after alloca. */ | |
c2e1680a | 403 | #define REGEX_FREE(arg) ((void)0) /* Do nothing! But inhibit gcc warning. */ |
fa9a63c5 RM |
404 | |
405 | #endif /* not REGEX_MALLOC */ | |
406 | ||
407 | /* Define how to allocate the failure stack. */ | |
408 | ||
33487cc8 | 409 | #if defined (REL_ALLOC) && defined (REGEX_MALLOC) |
4297555e | 410 | |
fa9a63c5 RM |
411 | #define REGEX_ALLOCATE_STACK(size) \ |
412 | r_alloc (&failure_stack_ptr, (size)) | |
413 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) \ | |
414 | r_re_alloc (&failure_stack_ptr, (nsize)) | |
415 | #define REGEX_FREE_STACK(ptr) \ | |
416 | r_alloc_free (&failure_stack_ptr) | |
417 | ||
4297555e | 418 | #else /* not using relocating allocator */ |
fa9a63c5 RM |
419 | |
420 | #ifdef REGEX_MALLOC | |
421 | ||
422 | #define REGEX_ALLOCATE_STACK malloc | |
423 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) realloc (source, nsize) | |
424 | #define REGEX_FREE_STACK free | |
425 | ||
426 | #else /* not REGEX_MALLOC */ | |
427 | ||
428 | #define REGEX_ALLOCATE_STACK alloca | |
429 | ||
430 | #define REGEX_REALLOCATE_STACK(source, osize, nsize) \ | |
431 | REGEX_REALLOCATE (source, osize, nsize) | |
25fe55af | 432 | /* No need to explicitly free anything. */ |
ed0767d8 | 433 | #define REGEX_FREE_STACK(arg) ((void)0) |
fa9a63c5 RM |
434 | |
435 | #endif /* not REGEX_MALLOC */ | |
4297555e | 436 | #endif /* not using relocating allocator */ |
fa9a63c5 RM |
437 | |
438 | ||
439 | /* True if `size1' is non-NULL and PTR is pointing anywhere inside | |
440 | `string1' or just past its end. This works if PTR is NULL, which is | |
441 | a good thing. */ | |
25fe55af | 442 | #define FIRST_STRING_P(ptr) \ |
fa9a63c5 RM |
443 | (size1 && string1 <= (ptr) && (ptr) <= string1 + size1) |
444 | ||
445 | /* (Re)Allocate N items of type T using malloc, or fail. */ | |
446 | #define TALLOC(n, t) ((t *) malloc ((n) * sizeof (t))) | |
447 | #define RETALLOC(addr, n, t) ((addr) = (t *) realloc (addr, (n) * sizeof (t))) | |
448 | #define RETALLOC_IF(addr, n, t) \ | |
449 | if (addr) RETALLOC((addr), (n), t); else (addr) = TALLOC ((n), t) | |
450 | #define REGEX_TALLOC(n, t) ((t *) REGEX_ALLOCATE ((n) * sizeof (t))) | |
451 | ||
25fe55af | 452 | #define BYTEWIDTH 8 /* In bits. */ |
fa9a63c5 RM |
453 | |
454 | #define STREQ(s1, s2) ((strcmp (s1, s2) == 0)) | |
455 | ||
456 | #undef MAX | |
457 | #undef MIN | |
458 | #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
459 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
460 | ||
66f0296e SM |
461 | /* Type of source-pattern and string chars. */ |
462 | typedef const unsigned char re_char; | |
463 | ||
fa9a63c5 RM |
464 | typedef char boolean; |
465 | #define false 0 | |
466 | #define true 1 | |
467 | ||
468 | static int re_match_2_internal (); | |
469 | \f | |
470 | /* These are the command codes that appear in compiled regular | |
25fe55af | 471 | expressions. Some opcodes are followed by argument bytes. A |
fa9a63c5 RM |
472 | command code can specify any interpretation whatsoever for its |
473 | arguments. Zero bytes may appear in the compiled regular expression. */ | |
474 | ||
475 | typedef enum | |
476 | { | |
477 | no_op = 0, | |
478 | ||
25fe55af | 479 | /* Succeed right away--no more backtracking. */ |
fa9a63c5 RM |
480 | succeed, |
481 | ||
25fe55af | 482 | /* Followed by one byte giving n, then by n literal bytes. */ |
fa9a63c5 RM |
483 | exactn, |
484 | ||
25fe55af | 485 | /* Matches any (more or less) character. */ |
fa9a63c5 RM |
486 | anychar, |
487 | ||
25fe55af RS |
488 | /* Matches any one char belonging to specified set. First |
489 | following byte is number of bitmap bytes. Then come bytes | |
490 | for a bitmap saying which chars are in. Bits in each byte | |
491 | are ordered low-bit-first. A character is in the set if its | |
492 | bit is 1. A character too large to have a bit in the map is | |
96cc36cc RS |
493 | automatically not in the set. |
494 | ||
495 | If the length byte has the 0x80 bit set, then that stuff | |
496 | is followed by a range table: | |
497 | 2 bytes of flags for character sets (low 8 bits, high 8 bits) | |
498 | See RANGE_TABLE_WORK_BITS below. | |
499 | 2 bytes, the number of pairs that follow | |
500 | pairs, each 2 multibyte characters, | |
501 | each multibyte character represented as 3 bytes. */ | |
fa9a63c5 RM |
502 | charset, |
503 | ||
25fe55af RS |
504 | /* Same parameters as charset, but match any character that is |
505 | not one of those specified. */ | |
fa9a63c5 RM |
506 | charset_not, |
507 | ||
25fe55af RS |
508 | /* Start remembering the text that is matched, for storing in a |
509 | register. Followed by one byte with the register number, in | |
510 | the range 0 to one less than the pattern buffer's re_nsub | |
505bde11 | 511 | field. */ |
fa9a63c5 RM |
512 | start_memory, |
513 | ||
25fe55af RS |
514 | /* Stop remembering the text that is matched and store it in a |
515 | memory register. Followed by one byte with the register | |
516 | number, in the range 0 to one less than `re_nsub' in the | |
505bde11 | 517 | pattern buffer. */ |
fa9a63c5 RM |
518 | stop_memory, |
519 | ||
25fe55af RS |
520 | /* Match a duplicate of something remembered. Followed by one |
521 | byte containing the register number. */ | |
fa9a63c5 RM |
522 | duplicate, |
523 | ||
25fe55af | 524 | /* Fail unless at beginning of line. */ |
fa9a63c5 RM |
525 | begline, |
526 | ||
25fe55af | 527 | /* Fail unless at end of line. */ |
fa9a63c5 RM |
528 | endline, |
529 | ||
25fe55af RS |
530 | /* Succeeds if at beginning of buffer (if emacs) or at beginning |
531 | of string to be matched (if not). */ | |
fa9a63c5 RM |
532 | begbuf, |
533 | ||
25fe55af | 534 | /* Analogously, for end of buffer/string. */ |
fa9a63c5 | 535 | endbuf, |
5e69f11e | 536 | |
25fe55af | 537 | /* Followed by two byte relative address to which to jump. */ |
5e69f11e | 538 | jump, |
fa9a63c5 | 539 | |
25fe55af RS |
540 | /* Followed by two-byte relative address of place to resume at |
541 | in case of failure. */ | |
fa9a63c5 | 542 | on_failure_jump, |
5e69f11e | 543 | |
25fe55af RS |
544 | /* Like on_failure_jump, but pushes a placeholder instead of the |
545 | current string position when executed. */ | |
fa9a63c5 | 546 | on_failure_keep_string_jump, |
5e69f11e | 547 | |
505bde11 SM |
548 | /* Just like `on_failure_jump', except that it checks that we |
549 | don't get stuck in an infinite loop (matching an empty string | |
550 | indefinitely). */ | |
551 | on_failure_jump_loop, | |
552 | ||
0683b6fa SM |
553 | /* Just like `on_failure_jump_loop', except that it checks for |
554 | a different kind of loop (the kind that shows up with non-greedy | |
555 | operators). This operation has to be immediately preceded | |
556 | by a `no_op'. */ | |
557 | on_failure_jump_nastyloop, | |
558 | ||
505bde11 SM |
559 | /* A smart `on_failure_jump' used for greedy * and + operators. |
560 | It analyses the loop before which it is put and if the | |
561 | loop does not require backtracking, it changes itself to | |
4e8a9132 SM |
562 | `on_failure_keep_string_jump' and short-circuits the loop, |
563 | else it just defaults to changing itself into `on_failure_jump'. | |
564 | It assumes that it is pointing to just past a `jump'. */ | |
505bde11 | 565 | on_failure_jump_smart, |
fa9a63c5 | 566 | |
25fe55af | 567 | /* Followed by two-byte relative address and two-byte number n. |
ed0767d8 SM |
568 | After matching N times, jump to the address upon failure. |
569 | Does not work if N starts at 0: use on_failure_jump_loop | |
570 | instead. */ | |
fa9a63c5 RM |
571 | succeed_n, |
572 | ||
25fe55af RS |
573 | /* Followed by two-byte relative address, and two-byte number n. |
574 | Jump to the address N times, then fail. */ | |
fa9a63c5 RM |
575 | jump_n, |
576 | ||
25fe55af RS |
577 | /* Set the following two-byte relative address to the |
578 | subsequent two-byte number. The address *includes* the two | |
579 | bytes of number. */ | |
fa9a63c5 RM |
580 | set_number_at, |
581 | ||
fa9a63c5 RM |
582 | wordbeg, /* Succeeds if at word beginning. */ |
583 | wordend, /* Succeeds if at word end. */ | |
584 | ||
585 | wordbound, /* Succeeds if at a word boundary. */ | |
1fb352e0 | 586 | notwordbound, /* Succeeds if not at a word boundary. */ |
fa9a63c5 RM |
587 | |
588 | /* Matches any character whose syntax is specified. Followed by | |
25fe55af | 589 | a byte which contains a syntax code, e.g., Sword. */ |
fa9a63c5 RM |
590 | syntaxspec, |
591 | ||
592 | /* Matches any character whose syntax is not that specified. */ | |
1fb352e0 SM |
593 | notsyntaxspec |
594 | ||
595 | #ifdef emacs | |
596 | ,before_dot, /* Succeeds if before point. */ | |
597 | at_dot, /* Succeeds if at point. */ | |
598 | after_dot, /* Succeeds if after point. */ | |
b18215fc RS |
599 | |
600 | /* Matches any character whose category-set contains the specified | |
25fe55af RS |
601 | category. The operator is followed by a byte which contains a |
602 | category code (mnemonic ASCII character). */ | |
b18215fc RS |
603 | categoryspec, |
604 | ||
605 | /* Matches any character whose category-set does not contain the | |
606 | specified category. The operator is followed by a byte which | |
607 | contains the category code (mnemonic ASCII character). */ | |
608 | notcategoryspec | |
fa9a63c5 RM |
609 | #endif /* emacs */ |
610 | } re_opcode_t; | |
611 | \f | |
612 | /* Common operations on the compiled pattern. */ | |
613 | ||
614 | /* Store NUMBER in two contiguous bytes starting at DESTINATION. */ | |
615 | ||
616 | #define STORE_NUMBER(destination, number) \ | |
617 | do { \ | |
618 | (destination)[0] = (number) & 0377; \ | |
619 | (destination)[1] = (number) >> 8; \ | |
620 | } while (0) | |
621 | ||
622 | /* Same as STORE_NUMBER, except increment DESTINATION to | |
623 | the byte after where the number is stored. Therefore, DESTINATION | |
624 | must be an lvalue. */ | |
625 | ||
626 | #define STORE_NUMBER_AND_INCR(destination, number) \ | |
627 | do { \ | |
628 | STORE_NUMBER (destination, number); \ | |
629 | (destination) += 2; \ | |
630 | } while (0) | |
631 | ||
632 | /* Put into DESTINATION a number stored in two contiguous bytes starting | |
633 | at SOURCE. */ | |
634 | ||
635 | #define EXTRACT_NUMBER(destination, source) \ | |
636 | do { \ | |
637 | (destination) = *(source) & 0377; \ | |
638 | (destination) += SIGN_EXTEND_CHAR (*((source) + 1)) << 8; \ | |
639 | } while (0) | |
640 | ||
641 | #ifdef DEBUG | |
642 | static void | |
643 | extract_number (dest, source) | |
644 | int *dest; | |
645 | unsigned char *source; | |
646 | { | |
5e69f11e | 647 | int temp = SIGN_EXTEND_CHAR (*(source + 1)); |
fa9a63c5 RM |
648 | *dest = *source & 0377; |
649 | *dest += temp << 8; | |
650 | } | |
651 | ||
25fe55af | 652 | #ifndef EXTRACT_MACROS /* To debug the macros. */ |
fa9a63c5 RM |
653 | #undef EXTRACT_NUMBER |
654 | #define EXTRACT_NUMBER(dest, src) extract_number (&dest, src) | |
655 | #endif /* not EXTRACT_MACROS */ | |
656 | ||
657 | #endif /* DEBUG */ | |
658 | ||
659 | /* Same as EXTRACT_NUMBER, except increment SOURCE to after the number. | |
660 | SOURCE must be an lvalue. */ | |
661 | ||
662 | #define EXTRACT_NUMBER_AND_INCR(destination, source) \ | |
663 | do { \ | |
664 | EXTRACT_NUMBER (destination, source); \ | |
25fe55af | 665 | (source) += 2; \ |
fa9a63c5 RM |
666 | } while (0) |
667 | ||
668 | #ifdef DEBUG | |
669 | static void | |
670 | extract_number_and_incr (destination, source) | |
671 | int *destination; | |
672 | unsigned char **source; | |
5e69f11e | 673 | { |
fa9a63c5 RM |
674 | extract_number (destination, *source); |
675 | *source += 2; | |
676 | } | |
677 | ||
678 | #ifndef EXTRACT_MACROS | |
679 | #undef EXTRACT_NUMBER_AND_INCR | |
680 | #define EXTRACT_NUMBER_AND_INCR(dest, src) \ | |
681 | extract_number_and_incr (&dest, &src) | |
682 | #endif /* not EXTRACT_MACROS */ | |
683 | ||
684 | #endif /* DEBUG */ | |
685 | \f | |
b18215fc RS |
686 | /* Store a multibyte character in three contiguous bytes starting |
687 | DESTINATION, and increment DESTINATION to the byte after where the | |
25fe55af | 688 | character is stored. Therefore, DESTINATION must be an lvalue. */ |
b18215fc RS |
689 | |
690 | #define STORE_CHARACTER_AND_INCR(destination, character) \ | |
691 | do { \ | |
692 | (destination)[0] = (character) & 0377; \ | |
693 | (destination)[1] = ((character) >> 8) & 0377; \ | |
694 | (destination)[2] = (character) >> 16; \ | |
695 | (destination) += 3; \ | |
696 | } while (0) | |
697 | ||
698 | /* Put into DESTINATION a character stored in three contiguous bytes | |
25fe55af | 699 | starting at SOURCE. */ |
b18215fc RS |
700 | |
701 | #define EXTRACT_CHARACTER(destination, source) \ | |
702 | do { \ | |
703 | (destination) = ((source)[0] \ | |
704 | | ((source)[1] << 8) \ | |
705 | | ((source)[2] << 16)); \ | |
706 | } while (0) | |
707 | ||
708 | ||
709 | /* Macros for charset. */ | |
710 | ||
711 | /* Size of bitmap of charset P in bytes. P is a start of charset, | |
712 | i.e. *P is (re_opcode_t) charset or (re_opcode_t) charset_not. */ | |
713 | #define CHARSET_BITMAP_SIZE(p) ((p)[1] & 0x7F) | |
714 | ||
715 | /* Nonzero if charset P has range table. */ | |
25fe55af | 716 | #define CHARSET_RANGE_TABLE_EXISTS_P(p) ((p)[1] & 0x80) |
b18215fc RS |
717 | |
718 | /* Return the address of range table of charset P. But not the start | |
719 | of table itself, but the before where the number of ranges is | |
96cc36cc RS |
720 | stored. `2 +' means to skip re_opcode_t and size of bitmap, |
721 | and the 2 bytes of flags at the start of the range table. */ | |
722 | #define CHARSET_RANGE_TABLE(p) (&(p)[4 + CHARSET_BITMAP_SIZE (p)]) | |
723 | ||
724 | /* Extract the bit flags that start a range table. */ | |
725 | #define CHARSET_RANGE_TABLE_BITS(p) \ | |
726 | ((p)[2 + CHARSET_BITMAP_SIZE (p)] \ | |
727 | + (p)[3 + CHARSET_BITMAP_SIZE (p)] * 0x100) | |
b18215fc RS |
728 | |
729 | /* Test if C is listed in the bitmap of charset P. */ | |
730 | #define CHARSET_LOOKUP_BITMAP(p, c) \ | |
731 | ((c) < CHARSET_BITMAP_SIZE (p) * BYTEWIDTH \ | |
732 | && (p)[2 + (c) / BYTEWIDTH] & (1 << ((c) % BYTEWIDTH))) | |
733 | ||
734 | /* Return the address of end of RANGE_TABLE. COUNT is number of | |
25fe55af RS |
735 | ranges (which is a pair of (start, end)) in the RANGE_TABLE. `* 2' |
736 | is start of range and end of range. `* 3' is size of each start | |
b18215fc RS |
737 | and end. */ |
738 | #define CHARSET_RANGE_TABLE_END(range_table, count) \ | |
739 | ((range_table) + (count) * 2 * 3) | |
740 | ||
25fe55af | 741 | /* Test if C is in RANGE_TABLE. A flag NOT is negated if C is in. |
b18215fc RS |
742 | COUNT is number of ranges in RANGE_TABLE. */ |
743 | #define CHARSET_LOOKUP_RANGE_TABLE_RAW(not, c, range_table, count) \ | |
744 | do \ | |
745 | { \ | |
746 | int range_start, range_end; \ | |
747 | unsigned char *p; \ | |
748 | unsigned char *range_table_end \ | |
749 | = CHARSET_RANGE_TABLE_END ((range_table), (count)); \ | |
750 | \ | |
751 | for (p = (range_table); p < range_table_end; p += 2 * 3) \ | |
752 | { \ | |
753 | EXTRACT_CHARACTER (range_start, p); \ | |
754 | EXTRACT_CHARACTER (range_end, p + 3); \ | |
755 | \ | |
756 | if (range_start <= (c) && (c) <= range_end) \ | |
757 | { \ | |
758 | (not) = !(not); \ | |
759 | break; \ | |
760 | } \ | |
761 | } \ | |
762 | } \ | |
763 | while (0) | |
764 | ||
765 | /* Test if C is in range table of CHARSET. The flag NOT is negated if | |
766 | C is listed in it. */ | |
767 | #define CHARSET_LOOKUP_RANGE_TABLE(not, c, charset) \ | |
768 | do \ | |
769 | { \ | |
770 | /* Number of ranges in range table. */ \ | |
771 | int count; \ | |
772 | unsigned char *range_table = CHARSET_RANGE_TABLE (charset); \ | |
773 | \ | |
774 | EXTRACT_NUMBER_AND_INCR (count, range_table); \ | |
775 | CHARSET_LOOKUP_RANGE_TABLE_RAW ((not), (c), range_table, count); \ | |
776 | } \ | |
777 | while (0) | |
778 | \f | |
fa9a63c5 RM |
779 | /* If DEBUG is defined, Regex prints many voluminous messages about what |
780 | it is doing (if the variable `debug' is nonzero). If linked with the | |
781 | main program in `iregex.c', you can enter patterns and strings | |
782 | interactively. And if linked with the main program in `main.c' and | |
25fe55af | 783 | the other test files, you can run the already-written tests. */ |
fa9a63c5 RM |
784 | |
785 | #ifdef DEBUG | |
786 | ||
787 | /* We use standard I/O for debugging. */ | |
788 | #include <stdio.h> | |
789 | ||
790 | /* It is useful to test things that ``must'' be true when debugging. */ | |
791 | #include <assert.h> | |
792 | ||
99633e97 | 793 | static int debug = -100000; |
fa9a63c5 RM |
794 | |
795 | #define DEBUG_STATEMENT(e) e | |
99633e97 SM |
796 | #define DEBUG_PRINT1(x) if (debug > 0) printf (x) |
797 | #define DEBUG_PRINT2(x1, x2) if (debug > 0) printf (x1, x2) | |
798 | #define DEBUG_PRINT3(x1, x2, x3) if (debug > 0) printf (x1, x2, x3) | |
799 | #define DEBUG_PRINT4(x1, x2, x3, x4) if (debug > 0) printf (x1, x2, x3, x4) | |
25fe55af | 800 | #define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) \ |
99633e97 | 801 | if (debug > 0) print_partial_compiled_pattern (s, e) |
fa9a63c5 | 802 | #define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) \ |
99633e97 | 803 | if (debug > 0) print_double_string (w, s1, sz1, s2, sz2) |
fa9a63c5 RM |
804 | |
805 | ||
806 | /* Print the fastmap in human-readable form. */ | |
807 | ||
808 | void | |
809 | print_fastmap (fastmap) | |
810 | char *fastmap; | |
811 | { | |
812 | unsigned was_a_range = 0; | |
5e69f11e RM |
813 | unsigned i = 0; |
814 | ||
fa9a63c5 RM |
815 | while (i < (1 << BYTEWIDTH)) |
816 | { | |
817 | if (fastmap[i++]) | |
818 | { | |
819 | was_a_range = 0; | |
25fe55af RS |
820 | putchar (i - 1); |
821 | while (i < (1 << BYTEWIDTH) && fastmap[i]) | |
822 | { | |
823 | was_a_range = 1; | |
824 | i++; | |
825 | } | |
fa9a63c5 | 826 | if (was_a_range) |
25fe55af RS |
827 | { |
828 | printf ("-"); | |
829 | putchar (i - 1); | |
830 | } | |
831 | } | |
fa9a63c5 | 832 | } |
5e69f11e | 833 | putchar ('\n'); |
fa9a63c5 RM |
834 | } |
835 | ||
836 | ||
837 | /* Print a compiled pattern string in human-readable form, starting at | |
838 | the START pointer into it and ending just before the pointer END. */ | |
839 | ||
840 | void | |
841 | print_partial_compiled_pattern (start, end) | |
842 | unsigned char *start; | |
843 | unsigned char *end; | |
844 | { | |
845 | int mcnt, mcnt2; | |
846 | unsigned char *p = start; | |
847 | unsigned char *pend = end; | |
848 | ||
849 | if (start == NULL) | |
850 | { | |
851 | printf ("(null)\n"); | |
852 | return; | |
853 | } | |
5e69f11e | 854 | |
fa9a63c5 RM |
855 | /* Loop over pattern commands. */ |
856 | while (p < pend) | |
857 | { | |
858 | printf ("%d:\t", p - start); | |
859 | ||
860 | switch ((re_opcode_t) *p++) | |
861 | { | |
25fe55af RS |
862 | case no_op: |
863 | printf ("/no_op"); | |
864 | break; | |
fa9a63c5 | 865 | |
99633e97 SM |
866 | case succeed: |
867 | printf ("/succeed"); | |
868 | break; | |
869 | ||
fa9a63c5 RM |
870 | case exactn: |
871 | mcnt = *p++; | |
25fe55af RS |
872 | printf ("/exactn/%d", mcnt); |
873 | do | |
fa9a63c5 | 874 | { |
25fe55af | 875 | putchar ('/'); |
fa9a63c5 | 876 | putchar (*p++); |
25fe55af RS |
877 | } |
878 | while (--mcnt); | |
879 | break; | |
fa9a63c5 RM |
880 | |
881 | case start_memory: | |
505bde11 | 882 | printf ("/start_memory/%d", *p++); |
25fe55af | 883 | break; |
fa9a63c5 RM |
884 | |
885 | case stop_memory: | |
505bde11 | 886 | printf ("/stop_memory/%d", *p++); |
25fe55af | 887 | break; |
fa9a63c5 RM |
888 | |
889 | case duplicate: | |
890 | printf ("/duplicate/%d", *p++); | |
891 | break; | |
892 | ||
893 | case anychar: | |
894 | printf ("/anychar"); | |
895 | break; | |
896 | ||
897 | case charset: | |
25fe55af RS |
898 | case charset_not: |
899 | { | |
900 | register int c, last = -100; | |
fa9a63c5 | 901 | register int in_range = 0; |
99633e97 SM |
902 | int length = CHARSET_BITMAP_SIZE (p - 1); |
903 | int has_range_table = CHARSET_RANGE_TABLE_EXISTS_P (p - 1); | |
fa9a63c5 RM |
904 | |
905 | printf ("/charset [%s", | |
25fe55af | 906 | (re_opcode_t) *(p - 1) == charset_not ? "^" : ""); |
5e69f11e | 907 | |
25fe55af | 908 | assert (p + *p < pend); |
fa9a63c5 | 909 | |
25fe55af | 910 | for (c = 0; c < 256; c++) |
96cc36cc | 911 | if (c / 8 < length |
fa9a63c5 RM |
912 | && (p[1 + (c/8)] & (1 << (c % 8)))) |
913 | { | |
914 | /* Are we starting a range? */ | |
915 | if (last + 1 == c && ! in_range) | |
916 | { | |
917 | putchar ('-'); | |
918 | in_range = 1; | |
919 | } | |
920 | /* Have we broken a range? */ | |
921 | else if (last + 1 != c && in_range) | |
96cc36cc | 922 | { |
fa9a63c5 RM |
923 | putchar (last); |
924 | in_range = 0; | |
925 | } | |
5e69f11e | 926 | |
fa9a63c5 RM |
927 | if (! in_range) |
928 | putchar (c); | |
929 | ||
930 | last = c; | |
25fe55af | 931 | } |
fa9a63c5 RM |
932 | |
933 | if (in_range) | |
934 | putchar (last); | |
935 | ||
936 | putchar (']'); | |
937 | ||
99633e97 | 938 | p += 1 + length; |
96cc36cc | 939 | |
96cc36cc | 940 | if (has_range_table) |
99633e97 SM |
941 | { |
942 | int count; | |
943 | printf ("has-range-table"); | |
944 | ||
945 | /* ??? Should print the range table; for now, just skip it. */ | |
946 | p += 2; /* skip range table bits */ | |
947 | EXTRACT_NUMBER_AND_INCR (count, p); | |
948 | p = CHARSET_RANGE_TABLE_END (p, count); | |
949 | } | |
fa9a63c5 RM |
950 | } |
951 | break; | |
952 | ||
953 | case begline: | |
954 | printf ("/begline"); | |
25fe55af | 955 | break; |
fa9a63c5 RM |
956 | |
957 | case endline: | |
25fe55af RS |
958 | printf ("/endline"); |
959 | break; | |
fa9a63c5 RM |
960 | |
961 | case on_failure_jump: | |
25fe55af RS |
962 | extract_number_and_incr (&mcnt, &p); |
963 | printf ("/on_failure_jump to %d", p + mcnt - start); | |
964 | break; | |
fa9a63c5 RM |
965 | |
966 | case on_failure_keep_string_jump: | |
25fe55af RS |
967 | extract_number_and_incr (&mcnt, &p); |
968 | printf ("/on_failure_keep_string_jump to %d", p + mcnt - start); | |
969 | break; | |
fa9a63c5 | 970 | |
0683b6fa SM |
971 | case on_failure_jump_nastyloop: |
972 | extract_number_and_incr (&mcnt, &p); | |
973 | printf ("/on_failure_jump_nastyloop to %d", p + mcnt - start); | |
974 | break; | |
975 | ||
505bde11 | 976 | case on_failure_jump_loop: |
fa9a63c5 | 977 | extract_number_and_incr (&mcnt, &p); |
505bde11 | 978 | printf ("/on_failure_jump_loop to %d", p + mcnt - start); |
5e69f11e RM |
979 | break; |
980 | ||
505bde11 | 981 | case on_failure_jump_smart: |
fa9a63c5 | 982 | extract_number_and_incr (&mcnt, &p); |
505bde11 | 983 | printf ("/on_failure_jump_smart to %d", p + mcnt - start); |
5e69f11e RM |
984 | break; |
985 | ||
25fe55af | 986 | case jump: |
fa9a63c5 | 987 | extract_number_and_incr (&mcnt, &p); |
25fe55af | 988 | printf ("/jump to %d", p + mcnt - start); |
fa9a63c5 RM |
989 | break; |
990 | ||
25fe55af RS |
991 | case succeed_n: |
992 | extract_number_and_incr (&mcnt, &p); | |
993 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 994 | printf ("/succeed_n to %d, %d times", p - 2 + mcnt - start, mcnt2); |
25fe55af | 995 | break; |
5e69f11e | 996 | |
25fe55af RS |
997 | case jump_n: |
998 | extract_number_and_incr (&mcnt, &p); | |
999 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 1000 | printf ("/jump_n to %d, %d times", p - 2 + mcnt - start, mcnt2); |
25fe55af | 1001 | break; |
5e69f11e | 1002 | |
25fe55af RS |
1003 | case set_number_at: |
1004 | extract_number_and_incr (&mcnt, &p); | |
1005 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 1006 | printf ("/set_number_at location %d to %d", p - 2 + mcnt - start, mcnt2); |
25fe55af | 1007 | break; |
5e69f11e | 1008 | |
25fe55af | 1009 | case wordbound: |
fa9a63c5 RM |
1010 | printf ("/wordbound"); |
1011 | break; | |
1012 | ||
1013 | case notwordbound: | |
1014 | printf ("/notwordbound"); | |
25fe55af | 1015 | break; |
fa9a63c5 RM |
1016 | |
1017 | case wordbeg: | |
1018 | printf ("/wordbeg"); | |
1019 | break; | |
5e69f11e | 1020 | |
fa9a63c5 RM |
1021 | case wordend: |
1022 | printf ("/wordend"); | |
5e69f11e | 1023 | |
1fb352e0 SM |
1024 | case syntaxspec: |
1025 | printf ("/syntaxspec"); | |
1026 | mcnt = *p++; | |
1027 | printf ("/%d", mcnt); | |
1028 | break; | |
1029 | ||
1030 | case notsyntaxspec: | |
1031 | printf ("/notsyntaxspec"); | |
1032 | mcnt = *p++; | |
1033 | printf ("/%d", mcnt); | |
1034 | break; | |
1035 | ||
fa9a63c5 RM |
1036 | #ifdef emacs |
1037 | case before_dot: | |
1038 | printf ("/before_dot"); | |
25fe55af | 1039 | break; |
fa9a63c5 RM |
1040 | |
1041 | case at_dot: | |
1042 | printf ("/at_dot"); | |
25fe55af | 1043 | break; |
fa9a63c5 RM |
1044 | |
1045 | case after_dot: | |
1046 | printf ("/after_dot"); | |
25fe55af | 1047 | break; |
fa9a63c5 | 1048 | |
1fb352e0 SM |
1049 | case categoryspec: |
1050 | printf ("/categoryspec"); | |
fa9a63c5 RM |
1051 | mcnt = *p++; |
1052 | printf ("/%d", mcnt); | |
25fe55af | 1053 | break; |
5e69f11e | 1054 | |
1fb352e0 SM |
1055 | case notcategoryspec: |
1056 | printf ("/notcategoryspec"); | |
fa9a63c5 RM |
1057 | mcnt = *p++; |
1058 | printf ("/%d", mcnt); | |
1059 | break; | |
1060 | #endif /* emacs */ | |
1061 | ||
fa9a63c5 RM |
1062 | case begbuf: |
1063 | printf ("/begbuf"); | |
25fe55af | 1064 | break; |
fa9a63c5 RM |
1065 | |
1066 | case endbuf: | |
1067 | printf ("/endbuf"); | |
25fe55af | 1068 | break; |
fa9a63c5 | 1069 | |
25fe55af RS |
1070 | default: |
1071 | printf ("?%d", *(p-1)); | |
fa9a63c5 RM |
1072 | } |
1073 | ||
1074 | putchar ('\n'); | |
1075 | } | |
1076 | ||
1077 | printf ("%d:\tend of pattern.\n", p - start); | |
1078 | } | |
1079 | ||
1080 | ||
1081 | void | |
1082 | print_compiled_pattern (bufp) | |
1083 | struct re_pattern_buffer *bufp; | |
1084 | { | |
1085 | unsigned char *buffer = bufp->buffer; | |
1086 | ||
1087 | print_partial_compiled_pattern (buffer, buffer + bufp->used); | |
505bde11 | 1088 | printf ("%ld bytes used/%ld bytes allocated.\n", bufp->used, bufp->allocated); |
fa9a63c5 RM |
1089 | |
1090 | if (bufp->fastmap_accurate && bufp->fastmap) | |
1091 | { | |
1092 | printf ("fastmap: "); | |
1093 | print_fastmap (bufp->fastmap); | |
1094 | } | |
1095 | ||
1096 | printf ("re_nsub: %d\t", bufp->re_nsub); | |
1097 | printf ("regs_alloc: %d\t", bufp->regs_allocated); | |
1098 | printf ("can_be_null: %d\t", bufp->can_be_null); | |
1099 | printf ("newline_anchor: %d\n", bufp->newline_anchor); | |
1100 | printf ("no_sub: %d\t", bufp->no_sub); | |
1101 | printf ("not_bol: %d\t", bufp->not_bol); | |
1102 | printf ("not_eol: %d\t", bufp->not_eol); | |
1103 | printf ("syntax: %d\n", bufp->syntax); | |
505bde11 | 1104 | fflush (stdout); |
fa9a63c5 RM |
1105 | /* Perhaps we should print the translate table? */ |
1106 | } | |
1107 | ||
1108 | ||
1109 | void | |
1110 | print_double_string (where, string1, size1, string2, size2) | |
66f0296e SM |
1111 | re_char *where; |
1112 | re_char *string1; | |
1113 | re_char *string2; | |
fa9a63c5 RM |
1114 | int size1; |
1115 | int size2; | |
1116 | { | |
1117 | unsigned this_char; | |
5e69f11e | 1118 | |
fa9a63c5 RM |
1119 | if (where == NULL) |
1120 | printf ("(null)"); | |
1121 | else | |
1122 | { | |
1123 | if (FIRST_STRING_P (where)) | |
25fe55af RS |
1124 | { |
1125 | for (this_char = where - string1; this_char < size1; this_char++) | |
1126 | putchar (string1[this_char]); | |
fa9a63c5 | 1127 | |
25fe55af RS |
1128 | where = string2; |
1129 | } | |
fa9a63c5 RM |
1130 | |
1131 | for (this_char = where - string2; this_char < size2; this_char++) | |
25fe55af | 1132 | putchar (string2[this_char]); |
fa9a63c5 RM |
1133 | } |
1134 | } | |
1135 | ||
1136 | #else /* not DEBUG */ | |
1137 | ||
1138 | #undef assert | |
1139 | #define assert(e) | |
1140 | ||
1141 | #define DEBUG_STATEMENT(e) | |
1142 | #define DEBUG_PRINT1(x) | |
1143 | #define DEBUG_PRINT2(x1, x2) | |
1144 | #define DEBUG_PRINT3(x1, x2, x3) | |
1145 | #define DEBUG_PRINT4(x1, x2, x3, x4) | |
1146 | #define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) | |
1147 | #define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) | |
1148 | ||
1149 | #endif /* not DEBUG */ | |
1150 | \f | |
1151 | /* Set by `re_set_syntax' to the current regexp syntax to recognize. Can | |
1152 | also be assigned to arbitrarily: each pattern buffer stores its own | |
1153 | syntax, so it can be changed between regex compilations. */ | |
1154 | /* This has no initializer because initialized variables in Emacs | |
1155 | become read-only after dumping. */ | |
1156 | reg_syntax_t re_syntax_options; | |
1157 | ||
1158 | ||
1159 | /* Specify the precise syntax of regexps for compilation. This provides | |
1160 | for compatibility for various utilities which historically have | |
1161 | different, incompatible syntaxes. | |
1162 | ||
1163 | The argument SYNTAX is a bit mask comprised of the various bits | |
25fe55af | 1164 | defined in regex.h. We return the old syntax. */ |
fa9a63c5 RM |
1165 | |
1166 | reg_syntax_t | |
1167 | re_set_syntax (syntax) | |
1168 | reg_syntax_t syntax; | |
1169 | { | |
1170 | reg_syntax_t ret = re_syntax_options; | |
5e69f11e | 1171 | |
fa9a63c5 RM |
1172 | re_syntax_options = syntax; |
1173 | return ret; | |
1174 | } | |
1175 | \f | |
1176 | /* This table gives an error message for each of the error codes listed | |
25fe55af | 1177 | in regex.h. Obviously the order here has to be same as there. |
fa9a63c5 | 1178 | POSIX doesn't require that we do anything for REG_NOERROR, |
25fe55af | 1179 | but why not be nice? */ |
fa9a63c5 RM |
1180 | |
1181 | static const char *re_error_msgid[] = | |
5e69f11e RM |
1182 | { |
1183 | gettext_noop ("Success"), /* REG_NOERROR */ | |
1184 | gettext_noop ("No match"), /* REG_NOMATCH */ | |
1185 | gettext_noop ("Invalid regular expression"), /* REG_BADPAT */ | |
1186 | gettext_noop ("Invalid collation character"), /* REG_ECOLLATE */ | |
1187 | gettext_noop ("Invalid character class name"), /* REG_ECTYPE */ | |
1188 | gettext_noop ("Trailing backslash"), /* REG_EESCAPE */ | |
1189 | gettext_noop ("Invalid back reference"), /* REG_ESUBREG */ | |
1190 | gettext_noop ("Unmatched [ or [^"), /* REG_EBRACK */ | |
1191 | gettext_noop ("Unmatched ( or \\("), /* REG_EPAREN */ | |
1192 | gettext_noop ("Unmatched \\{"), /* REG_EBRACE */ | |
1193 | gettext_noop ("Invalid content of \\{\\}"), /* REG_BADBR */ | |
1194 | gettext_noop ("Invalid range end"), /* REG_ERANGE */ | |
1195 | gettext_noop ("Memory exhausted"), /* REG_ESPACE */ | |
1196 | gettext_noop ("Invalid preceding regular expression"), /* REG_BADRPT */ | |
1197 | gettext_noop ("Premature end of regular expression"), /* REG_EEND */ | |
1198 | gettext_noop ("Regular expression too big"), /* REG_ESIZE */ | |
1199 | gettext_noop ("Unmatched ) or \\)"), /* REG_ERPAREN */ | |
fa9a63c5 RM |
1200 | }; |
1201 | \f | |
25fe55af | 1202 | /* Avoiding alloca during matching, to placate r_alloc. */ |
fa9a63c5 RM |
1203 | |
1204 | /* Define MATCH_MAY_ALLOCATE unless we need to make sure that the | |
1205 | searching and matching functions should not call alloca. On some | |
1206 | systems, alloca is implemented in terms of malloc, and if we're | |
1207 | using the relocating allocator routines, then malloc could cause a | |
1208 | relocation, which might (if the strings being searched are in the | |
1209 | ralloc heap) shift the data out from underneath the regexp | |
1210 | routines. | |
1211 | ||
5e69f11e | 1212 | Here's another reason to avoid allocation: Emacs |
fa9a63c5 RM |
1213 | processes input from X in a signal handler; processing X input may |
1214 | call malloc; if input arrives while a matching routine is calling | |
1215 | malloc, then we're scrod. But Emacs can't just block input while | |
1216 | calling matching routines; then we don't notice interrupts when | |
1217 | they come in. So, Emacs blocks input around all regexp calls | |
1218 | except the matching calls, which it leaves unprotected, in the | |
1219 | faith that they will not malloc. */ | |
1220 | ||
1221 | /* Normally, this is fine. */ | |
1222 | #define MATCH_MAY_ALLOCATE | |
1223 | ||
1224 | /* When using GNU C, we are not REALLY using the C alloca, no matter | |
1225 | what config.h may say. So don't take precautions for it. */ | |
1226 | #ifdef __GNUC__ | |
1227 | #undef C_ALLOCA | |
1228 | #endif | |
1229 | ||
1230 | /* The match routines may not allocate if (1) they would do it with malloc | |
1231 | and (2) it's not safe for them to use malloc. | |
1232 | Note that if REL_ALLOC is defined, matching would not use malloc for the | |
1233 | failure stack, but we would still use it for the register vectors; | |
25fe55af | 1234 | so REL_ALLOC should not affect this. */ |
fa9a63c5 RM |
1235 | #if (defined (C_ALLOCA) || defined (REGEX_MALLOC)) && defined (emacs) |
1236 | #undef MATCH_MAY_ALLOCATE | |
1237 | #endif | |
1238 | ||
1239 | \f | |
1240 | /* Failure stack declarations and macros; both re_compile_fastmap and | |
1241 | re_match_2 use a failure stack. These have to be macros because of | |
1242 | REGEX_ALLOCATE_STACK. */ | |
5e69f11e | 1243 | |
fa9a63c5 | 1244 | |
320a2a73 | 1245 | /* Approximate number of failure points for which to initially allocate space |
fa9a63c5 RM |
1246 | when matching. If this number is exceeded, we allocate more |
1247 | space, so it is not a hard limit. */ | |
1248 | #ifndef INIT_FAILURE_ALLOC | |
320a2a73 | 1249 | #define INIT_FAILURE_ALLOC 20 |
fa9a63c5 RM |
1250 | #endif |
1251 | ||
1252 | /* Roughly the maximum number of failure points on the stack. Would be | |
320a2a73 | 1253 | exactly that if always used TYPICAL_FAILURE_SIZE items each time we failed. |
fa9a63c5 | 1254 | This is a variable only so users of regex can assign to it; we never |
25fe55af | 1255 | change it ourselves. */ |
fa9a63c5 | 1256 | #if defined (MATCH_MAY_ALLOCATE) |
320a2a73 KH |
1257 | /* Note that 4400 is enough to cause a crash on Alpha OSF/1, |
1258 | whose default stack limit is 2mb. In order for a larger | |
1259 | value to work reliably, you have to try to make it accord | |
1260 | with the process stack limit. */ | |
1261 | int re_max_failures = 40000; | |
fa9a63c5 | 1262 | #else |
320a2a73 | 1263 | int re_max_failures = 4000; |
fa9a63c5 RM |
1264 | #endif |
1265 | ||
1266 | union fail_stack_elt | |
1267 | { | |
66f0296e | 1268 | const unsigned char *pointer; |
505bde11 | 1269 | unsigned int integer; |
fa9a63c5 RM |
1270 | }; |
1271 | ||
1272 | typedef union fail_stack_elt fail_stack_elt_t; | |
1273 | ||
1274 | typedef struct | |
1275 | { | |
1276 | fail_stack_elt_t *stack; | |
1277 | unsigned size; | |
505bde11 SM |
1278 | unsigned avail; /* Offset of next open position. */ |
1279 | unsigned frame; /* Offset of the cur constructed frame. */ | |
fa9a63c5 RM |
1280 | } fail_stack_type; |
1281 | ||
505bde11 SM |
1282 | #define PATTERN_STACK_EMPTY() (fail_stack.avail == 0) |
1283 | #define FAIL_STACK_EMPTY() (fail_stack.frame == 0) | |
fa9a63c5 RM |
1284 | #define FAIL_STACK_FULL() (fail_stack.avail == fail_stack.size) |
1285 | ||
1286 | ||
1287 | /* Define macros to initialize and free the failure stack. | |
1288 | Do `return -2' if the alloc fails. */ | |
1289 | ||
1290 | #ifdef MATCH_MAY_ALLOCATE | |
1291 | #define INIT_FAIL_STACK() \ | |
1292 | do { \ | |
1293 | fail_stack.stack = (fail_stack_elt_t *) \ | |
320a2a73 KH |
1294 | REGEX_ALLOCATE_STACK (INIT_FAILURE_ALLOC * TYPICAL_FAILURE_SIZE \ |
1295 | * sizeof (fail_stack_elt_t)); \ | |
fa9a63c5 RM |
1296 | \ |
1297 | if (fail_stack.stack == NULL) \ | |
1298 | return -2; \ | |
1299 | \ | |
1300 | fail_stack.size = INIT_FAILURE_ALLOC; \ | |
1301 | fail_stack.avail = 0; \ | |
505bde11 | 1302 | fail_stack.frame = 0; \ |
fa9a63c5 RM |
1303 | } while (0) |
1304 | ||
1305 | #define RESET_FAIL_STACK() REGEX_FREE_STACK (fail_stack.stack) | |
1306 | #else | |
1307 | #define INIT_FAIL_STACK() \ | |
1308 | do { \ | |
1309 | fail_stack.avail = 0; \ | |
505bde11 | 1310 | fail_stack.frame = 0; \ |
fa9a63c5 RM |
1311 | } while (0) |
1312 | ||
ed0767d8 | 1313 | #define RESET_FAIL_STACK() ((void)0) |
fa9a63c5 RM |
1314 | #endif |
1315 | ||
1316 | ||
320a2a73 KH |
1317 | /* Double the size of FAIL_STACK, up to a limit |
1318 | which allows approximately `re_max_failures' items. | |
fa9a63c5 RM |
1319 | |
1320 | Return 1 if succeeds, and 0 if either ran out of memory | |
5e69f11e RM |
1321 | allocating space for it or it was already too large. |
1322 | ||
25fe55af | 1323 | REGEX_REALLOCATE_STACK requires `destination' be declared. */ |
fa9a63c5 | 1324 | |
320a2a73 KH |
1325 | /* Factor to increase the failure stack size by |
1326 | when we increase it. | |
1327 | This used to be 2, but 2 was too wasteful | |
1328 | because the old discarded stacks added up to as much space | |
1329 | were as ultimate, maximum-size stack. */ | |
1330 | #define FAIL_STACK_GROWTH_FACTOR 4 | |
1331 | ||
1332 | #define GROW_FAIL_STACK(fail_stack) \ | |
eead07d6 KH |
1333 | (((fail_stack).size * sizeof (fail_stack_elt_t) \ |
1334 | >= re_max_failures * TYPICAL_FAILURE_SIZE) \ | |
fa9a63c5 | 1335 | ? 0 \ |
320a2a73 KH |
1336 | : ((fail_stack).stack \ |
1337 | = (fail_stack_elt_t *) \ | |
25fe55af RS |
1338 | REGEX_REALLOCATE_STACK ((fail_stack).stack, \ |
1339 | (fail_stack).size * sizeof (fail_stack_elt_t), \ | |
320a2a73 KH |
1340 | MIN (re_max_failures * TYPICAL_FAILURE_SIZE, \ |
1341 | ((fail_stack).size * sizeof (fail_stack_elt_t) \ | |
1342 | * FAIL_STACK_GROWTH_FACTOR))), \ | |
fa9a63c5 RM |
1343 | \ |
1344 | (fail_stack).stack == NULL \ | |
1345 | ? 0 \ | |
6453db45 KH |
1346 | : ((fail_stack).size \ |
1347 | = (MIN (re_max_failures * TYPICAL_FAILURE_SIZE, \ | |
1348 | ((fail_stack).size * sizeof (fail_stack_elt_t) \ | |
1349 | * FAIL_STACK_GROWTH_FACTOR)) \ | |
1350 | / sizeof (fail_stack_elt_t)), \ | |
25fe55af | 1351 | 1))) |
fa9a63c5 RM |
1352 | |
1353 | ||
5e69f11e | 1354 | /* Push pointer POINTER on FAIL_STACK. |
fa9a63c5 RM |
1355 | Return 1 if was able to do so and 0 if ran out of memory allocating |
1356 | space to do so. */ | |
1357 | #define PUSH_PATTERN_OP(POINTER, FAIL_STACK) \ | |
1358 | ((FAIL_STACK_FULL () \ | |
320a2a73 | 1359 | && !GROW_FAIL_STACK (FAIL_STACK)) \ |
fa9a63c5 RM |
1360 | ? 0 \ |
1361 | : ((FAIL_STACK).stack[(FAIL_STACK).avail++].pointer = POINTER, \ | |
1362 | 1)) | |
505bde11 | 1363 | #define POP_PATTERN_OP() POP_FAILURE_POINTER () |
fa9a63c5 RM |
1364 | |
1365 | /* Push a pointer value onto the failure stack. | |
1366 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1367 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1368 | #define PUSH_FAILURE_POINTER(item) \ |
1369 | fail_stack.stack[fail_stack.avail++].pointer = (unsigned char *) (item) | |
1370 | ||
1371 | /* This pushes an integer-valued item onto the failure stack. | |
1372 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1373 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1374 | #define PUSH_FAILURE_INT(item) \ |
1375 | fail_stack.stack[fail_stack.avail++].integer = (item) | |
1376 | ||
1377 | /* Push a fail_stack_elt_t value onto the failure stack. | |
1378 | Assumes the variable `fail_stack'. Probably should only | |
25fe55af | 1379 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1380 | #define PUSH_FAILURE_ELT(item) \ |
1381 | fail_stack.stack[fail_stack.avail++] = (item) | |
1382 | ||
1383 | /* These three POP... operations complement the three PUSH... operations. | |
1384 | All assume that `fail_stack' is nonempty. */ | |
1385 | #define POP_FAILURE_POINTER() fail_stack.stack[--fail_stack.avail].pointer | |
1386 | #define POP_FAILURE_INT() fail_stack.stack[--fail_stack.avail].integer | |
1387 | #define POP_FAILURE_ELT() fail_stack.stack[--fail_stack.avail] | |
1388 | ||
505bde11 SM |
1389 | /* Individual items aside from the registers. */ |
1390 | #define NUM_NONREG_ITEMS 3 | |
1391 | ||
1392 | /* Used to examine the stack (to detect infinite loops). */ | |
1393 | #define FAILURE_PAT(h) fail_stack.stack[(h) - 1].pointer | |
66f0296e | 1394 | #define FAILURE_STR(h) (fail_stack.stack[(h) - 2].pointer) |
505bde11 SM |
1395 | #define NEXT_FAILURE_HANDLE(h) fail_stack.stack[(h) - 3].integer |
1396 | #define TOP_FAILURE_HANDLE() fail_stack.frame | |
fa9a63c5 RM |
1397 | |
1398 | ||
505bde11 SM |
1399 | #define ENSURE_FAIL_STACK(space) \ |
1400 | while (REMAINING_AVAIL_SLOTS <= space) { \ | |
1401 | if (!GROW_FAIL_STACK (fail_stack)) \ | |
1402 | return -2; \ | |
1403 | DEBUG_PRINT2 ("\n Doubled stack; size now: %d\n", (fail_stack).size);\ | |
1404 | DEBUG_PRINT2 (" slots available: %d\n", REMAINING_AVAIL_SLOTS);\ | |
1405 | } | |
1406 | ||
1407 | /* Push register NUM onto the stack. */ | |
1408 | #define PUSH_FAILURE_REG(num) \ | |
1409 | do { \ | |
1410 | char *destination; \ | |
1411 | ENSURE_FAIL_STACK(3); \ | |
1412 | DEBUG_PRINT4 (" Push reg %d (spanning %p -> %p)\n", \ | |
1413 | num, regstart[num], regend[num]); \ | |
1414 | PUSH_FAILURE_POINTER (regstart[num]); \ | |
1415 | PUSH_FAILURE_POINTER (regend[num]); \ | |
1416 | PUSH_FAILURE_INT (num); \ | |
1417 | } while (0) | |
1418 | ||
1419 | /* Pop a saved register off the stack. */ | |
1420 | #define POP_FAILURE_REG() \ | |
1421 | do { \ | |
1422 | int reg = POP_FAILURE_INT (); \ | |
1423 | regend[reg] = POP_FAILURE_POINTER (); \ | |
1424 | regstart[reg] = POP_FAILURE_POINTER (); \ | |
1425 | DEBUG_PRINT4 (" Pop reg %d (spanning %p -> %p)\n", \ | |
1426 | reg, regstart[reg], regend[reg]); \ | |
1427 | } while (0) | |
1428 | ||
1429 | /* Check that we are not stuck in an infinite loop. */ | |
1430 | #define CHECK_INFINITE_LOOP(pat_cur, string_place) \ | |
1431 | do { \ | |
1432 | int failure = TOP_FAILURE_HANDLE(); \ | |
1433 | /* Check for infinite matching loops */ \ | |
1434 | while (failure > 0 && \ | |
1435 | (FAILURE_STR (failure) == string_place \ | |
1436 | || FAILURE_STR (failure) == NULL)) \ | |
1437 | { \ | |
1438 | assert (FAILURE_PAT (failure) >= bufp->buffer \ | |
66f0296e | 1439 | && FAILURE_PAT (failure) <= bufp->buffer + bufp->used); \ |
505bde11 SM |
1440 | if (FAILURE_PAT (failure) == pat_cur) \ |
1441 | goto fail; \ | |
66f0296e | 1442 | DEBUG_PRINT2 (" Other pattern: %p\n", FAILURE_PAT (failure)); \ |
505bde11 SM |
1443 | failure = NEXT_FAILURE_HANDLE(failure); \ |
1444 | } \ | |
1445 | DEBUG_PRINT2 (" Other string: %p\n", FAILURE_STR (failure)); \ | |
1446 | } while (0) | |
1447 | ||
fa9a63c5 | 1448 | /* Push the information about the state we will need |
5e69f11e RM |
1449 | if we ever fail back to it. |
1450 | ||
505bde11 | 1451 | Requires variables fail_stack, regstart, regend and |
320a2a73 | 1452 | num_regs be declared. GROW_FAIL_STACK requires `destination' be |
fa9a63c5 | 1453 | declared. |
5e69f11e | 1454 | |
fa9a63c5 RM |
1455 | Does `return FAILURE_CODE' if runs out of memory. */ |
1456 | ||
505bde11 SM |
1457 | #define PUSH_FAILURE_POINT(pattern, string_place) \ |
1458 | do { \ | |
1459 | char *destination; \ | |
1460 | /* Must be int, so when we don't save any registers, the arithmetic \ | |
1461 | of 0 + -1 isn't done as unsigned. */ \ | |
1462 | \ | |
1463 | DEBUG_STATEMENT (failure_id++); \ | |
1464 | DEBUG_STATEMENT (nfailure_points_pushed++); \ | |
1465 | DEBUG_PRINT2 ("\nPUSH_FAILURE_POINT #%u:\n", failure_id); \ | |
1466 | DEBUG_PRINT2 (" Before push, next avail: %d\n", (fail_stack).avail); \ | |
1467 | DEBUG_PRINT2 (" size: %d\n", (fail_stack).size);\ | |
1468 | \ | |
1469 | ENSURE_FAIL_STACK (NUM_NONREG_ITEMS); \ | |
1470 | \ | |
1471 | DEBUG_PRINT1 ("\n"); \ | |
1472 | \ | |
1473 | DEBUG_PRINT2 (" Push frame index: %d\n", fail_stack.frame); \ | |
1474 | PUSH_FAILURE_INT (fail_stack.frame); \ | |
1475 | \ | |
1476 | DEBUG_PRINT2 (" Push string %p: `", string_place); \ | |
1477 | DEBUG_PRINT_DOUBLE_STRING (string_place, string1, size1, string2, size2);\ | |
1478 | DEBUG_PRINT1 ("'\n"); \ | |
1479 | PUSH_FAILURE_POINTER (string_place); \ | |
1480 | \ | |
1481 | DEBUG_PRINT2 (" Push pattern %p: ", pattern); \ | |
1482 | DEBUG_PRINT_COMPILED_PATTERN (bufp, pattern, pend); \ | |
1483 | PUSH_FAILURE_POINTER (pattern); \ | |
1484 | \ | |
1485 | /* Close the frame by moving the frame pointer past it. */ \ | |
1486 | fail_stack.frame = fail_stack.avail; \ | |
1487 | } while (0) | |
fa9a63c5 | 1488 | |
320a2a73 KH |
1489 | /* Estimate the size of data pushed by a typical failure stack entry. |
1490 | An estimate is all we need, because all we use this for | |
1491 | is to choose a limit for how big to make the failure stack. */ | |
1492 | ||
1493 | #define TYPICAL_FAILURE_SIZE 20 | |
fa9a63c5 | 1494 | |
fa9a63c5 RM |
1495 | /* How many items can still be added to the stack without overflowing it. */ |
1496 | #define REMAINING_AVAIL_SLOTS ((fail_stack).size - (fail_stack).avail) | |
1497 | ||
1498 | ||
1499 | /* Pops what PUSH_FAIL_STACK pushes. | |
1500 | ||
1501 | We restore into the parameters, all of which should be lvalues: | |
1502 | STR -- the saved data position. | |
1503 | PAT -- the saved pattern position. | |
fa9a63c5 | 1504 | REGSTART, REGEND -- arrays of string positions. |
5e69f11e | 1505 | |
fa9a63c5 | 1506 | Also assumes the variables `fail_stack' and (if debugging), `bufp', |
25fe55af | 1507 | `pend', `string1', `size1', `string2', and `size2'. */ |
fa9a63c5 | 1508 | |
505bde11 SM |
1509 | #define POP_FAILURE_POINT(str, pat) \ |
1510 | do { \ | |
fa9a63c5 RM |
1511 | assert (!FAIL_STACK_EMPTY ()); \ |
1512 | \ | |
1513 | /* Remove failure points and point to how many regs pushed. */ \ | |
1514 | DEBUG_PRINT1 ("POP_FAILURE_POINT:\n"); \ | |
1515 | DEBUG_PRINT2 (" Before pop, next avail: %d\n", fail_stack.avail); \ | |
25fe55af | 1516 | DEBUG_PRINT2 (" size: %d\n", fail_stack.size); \ |
fa9a63c5 | 1517 | \ |
505bde11 SM |
1518 | /* Pop the saved registers. */ \ |
1519 | while (fail_stack.frame < fail_stack.avail) \ | |
1520 | POP_FAILURE_REG (); \ | |
fa9a63c5 | 1521 | \ |
505bde11 SM |
1522 | pat = (unsigned char *) POP_FAILURE_POINTER (); \ |
1523 | DEBUG_PRINT2 (" Popping pattern %p: ", pat); \ | |
1524 | DEBUG_PRINT_COMPILED_PATTERN (bufp, pat, pend); \ | |
fa9a63c5 RM |
1525 | \ |
1526 | /* If the saved string location is NULL, it came from an \ | |
1527 | on_failure_keep_string_jump opcode, and we want to throw away the \ | |
1528 | saved NULL, thus retaining our current position in the string. */ \ | |
66f0296e | 1529 | str = (re_char *) POP_FAILURE_POINTER (); \ |
505bde11 | 1530 | DEBUG_PRINT2 (" Popping string %p: `", str); \ |
fa9a63c5 RM |
1531 | DEBUG_PRINT_DOUBLE_STRING (str, string1, size1, string2, size2); \ |
1532 | DEBUG_PRINT1 ("'\n"); \ | |
1533 | \ | |
505bde11 SM |
1534 | fail_stack.frame = POP_FAILURE_INT (); \ |
1535 | DEBUG_PRINT2 (" Popping frame index: %d\n", fail_stack.frame); \ | |
fa9a63c5 | 1536 | \ |
505bde11 SM |
1537 | assert (fail_stack.avail >= 0); \ |
1538 | assert (fail_stack.frame <= fail_stack.avail); \ | |
fa9a63c5 | 1539 | \ |
fa9a63c5 | 1540 | DEBUG_STATEMENT (nfailure_points_popped++); \ |
505bde11 | 1541 | } while (0) /* POP_FAILURE_POINT */ |
fa9a63c5 RM |
1542 | |
1543 | ||
1544 | \f | |
fa9a63c5 | 1545 | /* Registers are set to a sentinel when they haven't yet matched. */ |
505bde11 | 1546 | #define REG_UNSET_VALUE NULL |
fa9a63c5 RM |
1547 | #define REG_UNSET(e) ((e) == REG_UNSET_VALUE) |
1548 | \f | |
1549 | /* Subroutine declarations and macros for regex_compile. */ | |
1550 | ||
99633e97 SM |
1551 | static void store_op1 _RE_ARGS((re_opcode_t op, unsigned char *loc, int arg)); |
1552 | static void store_op2 _RE_ARGS((re_opcode_t op, unsigned char *loc, | |
1553 | int arg1, int arg2)); | |
1554 | static void insert_op1 _RE_ARGS((re_opcode_t op, unsigned char *loc, | |
1555 | int arg, unsigned char *end)); | |
1556 | static void insert_op2 _RE_ARGS((re_opcode_t op, unsigned char *loc, | |
1557 | int arg1, int arg2, unsigned char *end)); | |
1558 | static boolean at_begline_loc_p _RE_ARGS((const unsigned char *pattern, | |
1559 | const unsigned char *p, | |
1560 | reg_syntax_t syntax)); | |
1561 | static boolean at_endline_loc_p _RE_ARGS((const unsigned char *p, | |
1562 | const unsigned char *pend, | |
1563 | reg_syntax_t syntax)); | |
4e8a9132 | 1564 | static unsigned char *skip_one_char _RE_ARGS((unsigned char *p)); |
f6a3f532 SM |
1565 | static int analyse_first _RE_ARGS((unsigned char *p, unsigned char *pend, |
1566 | char *fastmap, const int multibyte)); | |
fa9a63c5 | 1567 | |
5e69f11e | 1568 | /* Fetch the next character in the uncompiled pattern---translating it |
fa9a63c5 RM |
1569 | if necessary. Also cast from a signed character in the constant |
1570 | string passed to us by the user to an unsigned char that we can use | |
1571 | as an array index (in, e.g., `translate'). */ | |
1572 | #define PATFETCH(c) \ | |
99633e97 SM |
1573 | do { \ |
1574 | PATFETCH_RAW (c); \ | |
2d1675e4 | 1575 | c = TRANSLATE (c); \ |
fa9a63c5 RM |
1576 | } while (0) |
1577 | ||
1578 | /* Fetch the next character in the uncompiled pattern, with no | |
25fe55af | 1579 | translation. */ |
fa9a63c5 | 1580 | #define PATFETCH_RAW(c) \ |
2d1675e4 SM |
1581 | do { \ |
1582 | int len; \ | |
1583 | if (p == pend) return REG_EEND; \ | |
1584 | c = RE_STRING_CHAR_AND_LENGTH (p, pend - p, len); \ | |
1585 | p += len; \ | |
fa9a63c5 RM |
1586 | } while (0) |
1587 | ||
fa9a63c5 RM |
1588 | |
1589 | /* If `translate' is non-null, return translate[D], else just D. We | |
1590 | cast the subscript to translate because some data is declared as | |
1591 | `char *', to avoid warnings when a string constant is passed. But | |
1592 | when we use a character as a subscript we must make it unsigned. */ | |
6676cb1c RS |
1593 | #ifndef TRANSLATE |
1594 | #define TRANSLATE(d) \ | |
66f0296e | 1595 | (RE_TRANSLATE_P (translate) ? RE_TRANSLATE (translate, (d)) : (d)) |
6676cb1c | 1596 | #endif |
fa9a63c5 RM |
1597 | |
1598 | ||
1599 | /* Macros for outputting the compiled pattern into `buffer'. */ | |
1600 | ||
1601 | /* If the buffer isn't allocated when it comes in, use this. */ | |
1602 | #define INIT_BUF_SIZE 32 | |
1603 | ||
25fe55af | 1604 | /* Make sure we have at least N more bytes of space in buffer. */ |
fa9a63c5 RM |
1605 | #define GET_BUFFER_SPACE(n) \ |
1606 | while (b - bufp->buffer + (n) > bufp->allocated) \ | |
1607 | EXTEND_BUFFER () | |
1608 | ||
1609 | /* Make sure we have one more byte of buffer space and then add C to it. */ | |
1610 | #define BUF_PUSH(c) \ | |
1611 | do { \ | |
1612 | GET_BUFFER_SPACE (1); \ | |
1613 | *b++ = (unsigned char) (c); \ | |
1614 | } while (0) | |
1615 | ||
1616 | ||
1617 | /* Ensure we have two more bytes of buffer space and then append C1 and C2. */ | |
1618 | #define BUF_PUSH_2(c1, c2) \ | |
1619 | do { \ | |
1620 | GET_BUFFER_SPACE (2); \ | |
1621 | *b++ = (unsigned char) (c1); \ | |
1622 | *b++ = (unsigned char) (c2); \ | |
1623 | } while (0) | |
1624 | ||
1625 | ||
25fe55af | 1626 | /* As with BUF_PUSH_2, except for three bytes. */ |
fa9a63c5 RM |
1627 | #define BUF_PUSH_3(c1, c2, c3) \ |
1628 | do { \ | |
1629 | GET_BUFFER_SPACE (3); \ | |
1630 | *b++ = (unsigned char) (c1); \ | |
1631 | *b++ = (unsigned char) (c2); \ | |
1632 | *b++ = (unsigned char) (c3); \ | |
1633 | } while (0) | |
1634 | ||
1635 | ||
1636 | /* Store a jump with opcode OP at LOC to location TO. We store a | |
25fe55af | 1637 | relative address offset by the three bytes the jump itself occupies. */ |
fa9a63c5 RM |
1638 | #define STORE_JUMP(op, loc, to) \ |
1639 | store_op1 (op, loc, (to) - (loc) - 3) | |
1640 | ||
1641 | /* Likewise, for a two-argument jump. */ | |
1642 | #define STORE_JUMP2(op, loc, to, arg) \ | |
1643 | store_op2 (op, loc, (to) - (loc) - 3, arg) | |
1644 | ||
25fe55af | 1645 | /* Like `STORE_JUMP', but for inserting. Assume `b' is the buffer end. */ |
fa9a63c5 RM |
1646 | #define INSERT_JUMP(op, loc, to) \ |
1647 | insert_op1 (op, loc, (to) - (loc) - 3, b) | |
1648 | ||
1649 | /* Like `STORE_JUMP2', but for inserting. Assume `b' is the buffer end. */ | |
1650 | #define INSERT_JUMP2(op, loc, to, arg) \ | |
1651 | insert_op2 (op, loc, (to) - (loc) - 3, arg, b) | |
1652 | ||
1653 | ||
1654 | /* This is not an arbitrary limit: the arguments which represent offsets | |
25fe55af | 1655 | into the pattern are two bytes long. So if 2^16 bytes turns out to |
fa9a63c5 RM |
1656 | be too small, many things would have to change. */ |
1657 | #define MAX_BUF_SIZE (1L << 16) | |
1658 | ||
1659 | ||
1660 | /* Extend the buffer by twice its current size via realloc and | |
1661 | reset the pointers that pointed into the old block to point to the | |
1662 | correct places in the new one. If extending the buffer results in it | |
25fe55af | 1663 | being larger than MAX_BUF_SIZE, then flag memory exhausted. */ |
fa9a63c5 | 1664 | #define EXTEND_BUFFER() \ |
25fe55af | 1665 | do { \ |
fa9a63c5 | 1666 | unsigned char *old_buffer = bufp->buffer; \ |
25fe55af | 1667 | if (bufp->allocated == MAX_BUF_SIZE) \ |
fa9a63c5 RM |
1668 | return REG_ESIZE; \ |
1669 | bufp->allocated <<= 1; \ | |
1670 | if (bufp->allocated > MAX_BUF_SIZE) \ | |
25fe55af | 1671 | bufp->allocated = MAX_BUF_SIZE; \ |
fa9a63c5 RM |
1672 | bufp->buffer = (unsigned char *) realloc (bufp->buffer, bufp->allocated);\ |
1673 | if (bufp->buffer == NULL) \ | |
1674 | return REG_ESPACE; \ | |
1675 | /* If the buffer moved, move all the pointers into it. */ \ | |
1676 | if (old_buffer != bufp->buffer) \ | |
1677 | { \ | |
25fe55af RS |
1678 | b = (b - old_buffer) + bufp->buffer; \ |
1679 | begalt = (begalt - old_buffer) + bufp->buffer; \ | |
1680 | if (fixup_alt_jump) \ | |
1681 | fixup_alt_jump = (fixup_alt_jump - old_buffer) + bufp->buffer;\ | |
1682 | if (laststart) \ | |
1683 | laststart = (laststart - old_buffer) + bufp->buffer; \ | |
1684 | if (pending_exact) \ | |
1685 | pending_exact = (pending_exact - old_buffer) + bufp->buffer; \ | |
fa9a63c5 RM |
1686 | } \ |
1687 | } while (0) | |
1688 | ||
1689 | ||
1690 | /* Since we have one byte reserved for the register number argument to | |
1691 | {start,stop}_memory, the maximum number of groups we can report | |
1692 | things about is what fits in that byte. */ | |
1693 | #define MAX_REGNUM 255 | |
1694 | ||
1695 | /* But patterns can have more than `MAX_REGNUM' registers. We just | |
1696 | ignore the excess. */ | |
1697 | typedef unsigned regnum_t; | |
1698 | ||
1699 | ||
1700 | /* Macros for the compile stack. */ | |
1701 | ||
1702 | /* Since offsets can go either forwards or backwards, this type needs to | |
25fe55af | 1703 | be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1. */ |
fa9a63c5 RM |
1704 | typedef int pattern_offset_t; |
1705 | ||
1706 | typedef struct | |
1707 | { | |
1708 | pattern_offset_t begalt_offset; | |
1709 | pattern_offset_t fixup_alt_jump; | |
5e69f11e | 1710 | pattern_offset_t laststart_offset; |
fa9a63c5 RM |
1711 | regnum_t regnum; |
1712 | } compile_stack_elt_t; | |
1713 | ||
1714 | ||
1715 | typedef struct | |
1716 | { | |
1717 | compile_stack_elt_t *stack; | |
1718 | unsigned size; | |
1719 | unsigned avail; /* Offset of next open position. */ | |
1720 | } compile_stack_type; | |
1721 | ||
1722 | ||
1723 | #define INIT_COMPILE_STACK_SIZE 32 | |
1724 | ||
1725 | #define COMPILE_STACK_EMPTY (compile_stack.avail == 0) | |
1726 | #define COMPILE_STACK_FULL (compile_stack.avail == compile_stack.size) | |
1727 | ||
25fe55af | 1728 | /* The next available element. */ |
fa9a63c5 RM |
1729 | #define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail]) |
1730 | ||
1731 | ||
b18215fc RS |
1732 | /* Structure to manage work area for range table. */ |
1733 | struct range_table_work_area | |
1734 | { | |
1735 | int *table; /* actual work area. */ | |
1736 | int allocated; /* allocated size for work area in bytes. */ | |
25fe55af | 1737 | int used; /* actually used size in words. */ |
96cc36cc | 1738 | int bits; /* flag to record character classes */ |
b18215fc RS |
1739 | }; |
1740 | ||
1741 | /* Make sure that WORK_AREA can hold more N multibyte characters. */ | |
1742 | #define EXTEND_RANGE_TABLE_WORK_AREA(work_area, n) \ | |
1743 | do { \ | |
1744 | if (((work_area).used + (n)) * sizeof (int) > (work_area).allocated) \ | |
1745 | { \ | |
1746 | (work_area).allocated += 16 * sizeof (int); \ | |
1747 | if ((work_area).table) \ | |
1748 | (work_area).table \ | |
1749 | = (int *) realloc ((work_area).table, (work_area).allocated); \ | |
1750 | else \ | |
1751 | (work_area).table \ | |
1752 | = (int *) malloc ((work_area).allocated); \ | |
1753 | if ((work_area).table == 0) \ | |
1754 | FREE_STACK_RETURN (REG_ESPACE); \ | |
1755 | } \ | |
1756 | } while (0) | |
1757 | ||
96cc36cc RS |
1758 | #define SET_RANGE_TABLE_WORK_AREA_BIT(work_area, bit) \ |
1759 | (work_area).bits |= (bit) | |
1760 | ||
1761 | /* These bits represent the various character classes such as [:alnum:] | |
1762 | in a charset's range table. */ | |
1763 | #define BIT_ALNUM 0x1 | |
1764 | #define BIT_ALPHA 0x2 | |
1765 | #define BIT_WORD 0x4 | |
f71b19b6 DL |
1766 | #define BIT_ASCII 0x8 |
1767 | #define BIT_NONASCII 0x10 | |
96cc36cc RS |
1768 | #define BIT_GRAPH 0x20 |
1769 | #define BIT_LOWER 0x40 | |
1770 | #define BIT_PRINT 0x80 | |
1771 | #define BIT_PUNCT 0x100 | |
1772 | #define BIT_SPACE 0x200 | |
1773 | #define BIT_UPPER 0x400 | |
f71b19b6 DL |
1774 | #define BIT_UNIBYTE 0x800 |
1775 | #define BIT_MULTIBYTE 0x1000 | |
96cc36cc | 1776 | |
b18215fc RS |
1777 | /* Set a range (RANGE_START, RANGE_END) to WORK_AREA. */ |
1778 | #define SET_RANGE_TABLE_WORK_AREA(work_area, range_start, range_end) \ | |
1779 | do { \ | |
1780 | EXTEND_RANGE_TABLE_WORK_AREA ((work_area), 2); \ | |
1781 | (work_area).table[(work_area).used++] = (range_start); \ | |
1782 | (work_area).table[(work_area).used++] = (range_end); \ | |
1783 | } while (0) | |
1784 | ||
25fe55af | 1785 | /* Free allocated memory for WORK_AREA. */ |
b18215fc RS |
1786 | #define FREE_RANGE_TABLE_WORK_AREA(work_area) \ |
1787 | do { \ | |
1788 | if ((work_area).table) \ | |
1789 | free ((work_area).table); \ | |
1790 | } while (0) | |
1791 | ||
96cc36cc | 1792 | #define CLEAR_RANGE_TABLE_WORK_USED(work_area) ((work_area).used = 0, (work_area).bits = 0) |
b18215fc | 1793 | #define RANGE_TABLE_WORK_USED(work_area) ((work_area).used) |
96cc36cc | 1794 | #define RANGE_TABLE_WORK_BITS(work_area) ((work_area).bits) |
b18215fc RS |
1795 | #define RANGE_TABLE_WORK_ELT(work_area, i) ((work_area).table[i]) |
1796 | ||
1797 | ||
fa9a63c5 | 1798 | /* Set the bit for character C in a list. */ |
25fe55af RS |
1799 | #define SET_LIST_BIT(c) \ |
1800 | (b[((unsigned char) (c)) / BYTEWIDTH] \ | |
fa9a63c5 RM |
1801 | |= 1 << (((unsigned char) c) % BYTEWIDTH)) |
1802 | ||
1803 | ||
1804 | /* Get the next unsigned number in the uncompiled pattern. */ | |
25fe55af | 1805 | #define GET_UNSIGNED_NUMBER(num) \ |
99633e97 | 1806 | do { if (p != pend) \ |
fa9a63c5 | 1807 | { \ |
25fe55af RS |
1808 | PATFETCH (c); \ |
1809 | while (ISDIGIT (c)) \ | |
1810 | { \ | |
1811 | if (num < 0) \ | |
1812 | num = 0; \ | |
1813 | num = num * 10 + c - '0'; \ | |
1814 | if (p == pend) \ | |
1815 | break; \ | |
1816 | PATFETCH (c); \ | |
1817 | } \ | |
1818 | } \ | |
99633e97 | 1819 | } while (0) |
fa9a63c5 RM |
1820 | |
1821 | #define CHAR_CLASS_MAX_LENGTH 6 /* Namely, `xdigit'. */ | |
1822 | ||
1823 | #define IS_CHAR_CLASS(string) \ | |
1824 | (STREQ (string, "alpha") || STREQ (string, "upper") \ | |
1825 | || STREQ (string, "lower") || STREQ (string, "digit") \ | |
1826 | || STREQ (string, "alnum") || STREQ (string, "xdigit") \ | |
1827 | || STREQ (string, "space") || STREQ (string, "print") \ | |
1828 | || STREQ (string, "punct") || STREQ (string, "graph") \ | |
96cc36cc | 1829 | || STREQ (string, "cntrl") || STREQ (string, "blank") \ |
f71b19b6 DL |
1830 | || STREQ (string, "word") \ |
1831 | || STREQ (string, "ascii") || STREQ (string, "nonascii") \ | |
1832 | || STREQ (string, "unibyte") || STREQ (string, "multibyte")) | |
99633e97 SM |
1833 | |
1834 | /* QUIT is only used on NTemacs. */ | |
1835 | #if !defined (WINDOWSNT) || !defined (emacs) | |
1836 | #undef QUIT | |
1837 | #define QUIT | |
1838 | #endif | |
fa9a63c5 RM |
1839 | \f |
1840 | #ifndef MATCH_MAY_ALLOCATE | |
1841 | ||
1842 | /* If we cannot allocate large objects within re_match_2_internal, | |
1843 | we make the fail stack and register vectors global. | |
1844 | The fail stack, we grow to the maximum size when a regexp | |
1845 | is compiled. | |
1846 | The register vectors, we adjust in size each time we | |
1847 | compile a regexp, according to the number of registers it needs. */ | |
1848 | ||
1849 | static fail_stack_type fail_stack; | |
1850 | ||
1851 | /* Size with which the following vectors are currently allocated. | |
1852 | That is so we can make them bigger as needed, | |
25fe55af | 1853 | but never make them smaller. */ |
fa9a63c5 RM |
1854 | static int regs_allocated_size; |
1855 | ||
66f0296e SM |
1856 | static re_char ** regstart, ** regend; |
1857 | static re_char **best_regstart, **best_regend; | |
fa9a63c5 RM |
1858 | |
1859 | /* Make the register vectors big enough for NUM_REGS registers, | |
25fe55af | 1860 | but don't make them smaller. */ |
fa9a63c5 RM |
1861 | |
1862 | static | |
1863 | regex_grow_registers (num_regs) | |
1864 | int num_regs; | |
1865 | { | |
1866 | if (num_regs > regs_allocated_size) | |
1867 | { | |
66f0296e SM |
1868 | RETALLOC_IF (regstart, num_regs, re_char *); |
1869 | RETALLOC_IF (regend, num_regs, re_char *); | |
1870 | RETALLOC_IF (best_regstart, num_regs, re_char *); | |
1871 | RETALLOC_IF (best_regend, num_regs, re_char *); | |
fa9a63c5 RM |
1872 | |
1873 | regs_allocated_size = num_regs; | |
1874 | } | |
1875 | } | |
1876 | ||
1877 | #endif /* not MATCH_MAY_ALLOCATE */ | |
1878 | \f | |
99633e97 SM |
1879 | static boolean group_in_compile_stack _RE_ARGS ((compile_stack_type |
1880 | compile_stack, | |
1881 | regnum_t regnum)); | |
1882 | ||
fa9a63c5 RM |
1883 | /* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX. |
1884 | Returns one of error codes defined in `regex.h', or zero for success. | |
1885 | ||
1886 | Assumes the `allocated' (and perhaps `buffer') and `translate' | |
1887 | fields are set in BUFP on entry. | |
1888 | ||
1889 | If it succeeds, results are put in BUFP (if it returns an error, the | |
1890 | contents of BUFP are undefined): | |
1891 | `buffer' is the compiled pattern; | |
1892 | `syntax' is set to SYNTAX; | |
1893 | `used' is set to the length of the compiled pattern; | |
1894 | `fastmap_accurate' is zero; | |
1895 | `re_nsub' is the number of subexpressions in PATTERN; | |
1896 | `not_bol' and `not_eol' are zero; | |
5e69f11e | 1897 | |
fa9a63c5 RM |
1898 | The `fastmap' and `newline_anchor' fields are neither |
1899 | examined nor set. */ | |
1900 | ||
505bde11 SM |
1901 | /* Insert the `jump' from the end of last alternative to "here". |
1902 | The space for the jump has already been allocated. */ | |
1903 | #define FIXUP_ALT_JUMP() \ | |
1904 | do { \ | |
1905 | if (fixup_alt_jump) \ | |
1906 | STORE_JUMP (jump, fixup_alt_jump, b); \ | |
1907 | } while (0) | |
1908 | ||
1909 | ||
fa9a63c5 RM |
1910 | /* Return, freeing storage we allocated. */ |
1911 | #define FREE_STACK_RETURN(value) \ | |
b18215fc RS |
1912 | do { \ |
1913 | FREE_RANGE_TABLE_WORK_AREA (range_table_work); \ | |
1914 | free (compile_stack.stack); \ | |
1915 | return value; \ | |
1916 | } while (0) | |
fa9a63c5 RM |
1917 | |
1918 | static reg_errcode_t | |
1919 | regex_compile (pattern, size, syntax, bufp) | |
66f0296e | 1920 | re_char *pattern; |
fa9a63c5 RM |
1921 | int size; |
1922 | reg_syntax_t syntax; | |
1923 | struct re_pattern_buffer *bufp; | |
1924 | { | |
1925 | /* We fetch characters from PATTERN here. Even though PATTERN is | |
1926 | `char *' (i.e., signed), we declare these variables as unsigned, so | |
1927 | they can be reliably used as array indices. */ | |
b18215fc | 1928 | register unsigned int c, c1; |
5e69f11e | 1929 | |
fa9a63c5 | 1930 | /* A random temporary spot in PATTERN. */ |
66f0296e | 1931 | re_char *p1; |
fa9a63c5 RM |
1932 | |
1933 | /* Points to the end of the buffer, where we should append. */ | |
1934 | register unsigned char *b; | |
5e69f11e | 1935 | |
fa9a63c5 RM |
1936 | /* Keeps track of unclosed groups. */ |
1937 | compile_stack_type compile_stack; | |
1938 | ||
1939 | /* Points to the current (ending) position in the pattern. */ | |
22336245 RS |
1940 | #ifdef AIX |
1941 | /* `const' makes AIX compiler fail. */ | |
66f0296e | 1942 | unsigned char *p = pattern; |
22336245 | 1943 | #else |
66f0296e | 1944 | re_char *p = pattern; |
22336245 | 1945 | #endif |
66f0296e | 1946 | re_char *pend = pattern + size; |
5e69f11e | 1947 | |
fa9a63c5 | 1948 | /* How to translate the characters in the pattern. */ |
6676cb1c | 1949 | RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 RM |
1950 | |
1951 | /* Address of the count-byte of the most recently inserted `exactn' | |
1952 | command. This makes it possible to tell if a new exact-match | |
1953 | character can be added to that command or if the character requires | |
1954 | a new `exactn' command. */ | |
1955 | unsigned char *pending_exact = 0; | |
1956 | ||
1957 | /* Address of start of the most recently finished expression. | |
1958 | This tells, e.g., postfix * where to find the start of its | |
1959 | operand. Reset at the beginning of groups and alternatives. */ | |
1960 | unsigned char *laststart = 0; | |
1961 | ||
1962 | /* Address of beginning of regexp, or inside of last group. */ | |
1963 | unsigned char *begalt; | |
1964 | ||
1965 | /* Place in the uncompiled pattern (i.e., the {) to | |
1966 | which to go back if the interval is invalid. */ | |
66f0296e | 1967 | re_char *beg_interval; |
5e69f11e | 1968 | |
fa9a63c5 | 1969 | /* Address of the place where a forward jump should go to the end of |
25fe55af | 1970 | the containing expression. Each alternative of an `or' -- except the |
fa9a63c5 RM |
1971 | last -- ends with a forward jump of this sort. */ |
1972 | unsigned char *fixup_alt_jump = 0; | |
1973 | ||
1974 | /* Counts open-groups as they are encountered. Remembered for the | |
1975 | matching close-group on the compile stack, so the same register | |
1976 | number is put in the stop_memory as the start_memory. */ | |
1977 | regnum_t regnum = 0; | |
1978 | ||
b18215fc RS |
1979 | /* Work area for range table of charset. */ |
1980 | struct range_table_work_area range_table_work; | |
1981 | ||
2d1675e4 SM |
1982 | /* If the object matched can contain multibyte characters. */ |
1983 | const boolean multibyte = RE_MULTIBYTE_P (bufp); | |
1984 | ||
fa9a63c5 | 1985 | #ifdef DEBUG |
99633e97 | 1986 | debug++; |
fa9a63c5 | 1987 | DEBUG_PRINT1 ("\nCompiling pattern: "); |
99633e97 | 1988 | if (debug > 0) |
fa9a63c5 RM |
1989 | { |
1990 | unsigned debug_count; | |
5e69f11e | 1991 | |
fa9a63c5 | 1992 | for (debug_count = 0; debug_count < size; debug_count++) |
25fe55af | 1993 | putchar (pattern[debug_count]); |
fa9a63c5 RM |
1994 | putchar ('\n'); |
1995 | } | |
1996 | #endif /* DEBUG */ | |
1997 | ||
1998 | /* Initialize the compile stack. */ | |
1999 | compile_stack.stack = TALLOC (INIT_COMPILE_STACK_SIZE, compile_stack_elt_t); | |
2000 | if (compile_stack.stack == NULL) | |
2001 | return REG_ESPACE; | |
2002 | ||
2003 | compile_stack.size = INIT_COMPILE_STACK_SIZE; | |
2004 | compile_stack.avail = 0; | |
2005 | ||
b18215fc RS |
2006 | range_table_work.table = 0; |
2007 | range_table_work.allocated = 0; | |
2008 | ||
fa9a63c5 RM |
2009 | /* Initialize the pattern buffer. */ |
2010 | bufp->syntax = syntax; | |
2011 | bufp->fastmap_accurate = 0; | |
2012 | bufp->not_bol = bufp->not_eol = 0; | |
2013 | ||
2014 | /* Set `used' to zero, so that if we return an error, the pattern | |
2015 | printer (for debugging) will think there's no pattern. We reset it | |
2016 | at the end. */ | |
2017 | bufp->used = 0; | |
5e69f11e | 2018 | |
fa9a63c5 | 2019 | /* Always count groups, whether or not bufp->no_sub is set. */ |
5e69f11e | 2020 | bufp->re_nsub = 0; |
fa9a63c5 RM |
2021 | |
2022 | #if !defined (emacs) && !defined (SYNTAX_TABLE) | |
2023 | /* Initialize the syntax table. */ | |
2024 | init_syntax_once (); | |
2025 | #endif | |
2026 | ||
2027 | if (bufp->allocated == 0) | |
2028 | { | |
2029 | if (bufp->buffer) | |
2030 | { /* If zero allocated, but buffer is non-null, try to realloc | |
25fe55af RS |
2031 | enough space. This loses if buffer's address is bogus, but |
2032 | that is the user's responsibility. */ | |
2033 | RETALLOC (bufp->buffer, INIT_BUF_SIZE, unsigned char); | |
2034 | } | |
fa9a63c5 | 2035 | else |
25fe55af RS |
2036 | { /* Caller did not allocate a buffer. Do it for them. */ |
2037 | bufp->buffer = TALLOC (INIT_BUF_SIZE, unsigned char); | |
2038 | } | |
fa9a63c5 RM |
2039 | if (!bufp->buffer) FREE_STACK_RETURN (REG_ESPACE); |
2040 | ||
2041 | bufp->allocated = INIT_BUF_SIZE; | |
2042 | } | |
2043 | ||
2044 | begalt = b = bufp->buffer; | |
2045 | ||
2046 | /* Loop through the uncompiled pattern until we're at the end. */ | |
2047 | while (p != pend) | |
2048 | { | |
2049 | PATFETCH (c); | |
2050 | ||
2051 | switch (c) | |
25fe55af RS |
2052 | { |
2053 | case '^': | |
2054 | { | |
2055 | if ( /* If at start of pattern, it's an operator. */ | |
2056 | p == pattern + 1 | |
2057 | /* If context independent, it's an operator. */ | |
2058 | || syntax & RE_CONTEXT_INDEP_ANCHORS | |
2059 | /* Otherwise, depends on what's come before. */ | |
2060 | || at_begline_loc_p (pattern, p, syntax)) | |
2061 | BUF_PUSH (begline); | |
2062 | else | |
2063 | goto normal_char; | |
2064 | } | |
2065 | break; | |
2066 | ||
2067 | ||
2068 | case '$': | |
2069 | { | |
2070 | if ( /* If at end of pattern, it's an operator. */ | |
2071 | p == pend | |
2072 | /* If context independent, it's an operator. */ | |
2073 | || syntax & RE_CONTEXT_INDEP_ANCHORS | |
2074 | /* Otherwise, depends on what's next. */ | |
2075 | || at_endline_loc_p (p, pend, syntax)) | |
2076 | BUF_PUSH (endline); | |
2077 | else | |
2078 | goto normal_char; | |
2079 | } | |
2080 | break; | |
fa9a63c5 RM |
2081 | |
2082 | ||
2083 | case '+': | |
25fe55af RS |
2084 | case '?': |
2085 | if ((syntax & RE_BK_PLUS_QM) | |
2086 | || (syntax & RE_LIMITED_OPS)) | |
2087 | goto normal_char; | |
2088 | handle_plus: | |
2089 | case '*': | |
2090 | /* If there is no previous pattern... */ | |
2091 | if (!laststart) | |
2092 | { | |
2093 | if (syntax & RE_CONTEXT_INVALID_OPS) | |
2094 | FREE_STACK_RETURN (REG_BADRPT); | |
2095 | else if (!(syntax & RE_CONTEXT_INDEP_OPS)) | |
2096 | goto normal_char; | |
2097 | } | |
2098 | ||
2099 | { | |
25fe55af | 2100 | /* 1 means zero (many) matches is allowed. */ |
66f0296e SM |
2101 | boolean zero_times_ok = 0, many_times_ok = 0; |
2102 | boolean greedy = 1; | |
25fe55af RS |
2103 | |
2104 | /* If there is a sequence of repetition chars, collapse it | |
2105 | down to just one (the right one). We can't combine | |
2106 | interval operators with these because of, e.g., `a{2}*', | |
2107 | which should only match an even number of `a's. */ | |
2108 | ||
2109 | for (;;) | |
2110 | { | |
1c8c6d39 DL |
2111 | if (!(syntax & RE_ALL_GREEDY) |
2112 | && c == '?' && (zero_times_ok || many_times_ok)) | |
2113 | greedy = 0; | |
2114 | else | |
2115 | { | |
2116 | zero_times_ok |= c != '+'; | |
2117 | many_times_ok |= c != '?'; | |
2118 | } | |
25fe55af RS |
2119 | |
2120 | if (p == pend) | |
2121 | break; | |
ed0767d8 SM |
2122 | else if (*p == '*' |
2123 | || (!(syntax & RE_BK_PLUS_QM) | |
2124 | && (*p == '+' || *p == '?'))) | |
25fe55af | 2125 | ; |
ed0767d8 | 2126 | else if (syntax & RE_BK_PLUS_QM && *p == '\\') |
25fe55af | 2127 | { |
ed0767d8 SM |
2128 | if (p+1 == pend) |
2129 | FREE_STACK_RETURN (REG_EESCAPE); | |
2130 | if (p[1] == '+' || p[1] == '?') | |
2131 | PATFETCH (c); /* Gobble up the backslash. */ | |
2132 | else | |
2133 | break; | |
25fe55af RS |
2134 | } |
2135 | else | |
ed0767d8 | 2136 | break; |
25fe55af | 2137 | /* If we get here, we found another repeat character. */ |
ed0767d8 SM |
2138 | PATFETCH (c); |
2139 | } | |
25fe55af RS |
2140 | |
2141 | /* Star, etc. applied to an empty pattern is equivalent | |
2142 | to an empty pattern. */ | |
4e8a9132 | 2143 | if (!laststart || laststart == b) |
25fe55af RS |
2144 | break; |
2145 | ||
2146 | /* Now we know whether or not zero matches is allowed | |
2147 | and also whether or not two or more matches is allowed. */ | |
1c8c6d39 DL |
2148 | if (greedy) |
2149 | { | |
99633e97 | 2150 | if (many_times_ok) |
4e8a9132 SM |
2151 | { |
2152 | boolean simple = skip_one_char (laststart) == b; | |
2153 | unsigned int startoffset = 0; | |
f6a3f532 SM |
2154 | re_opcode_t ofj = |
2155 | (simple || !analyse_first (laststart, b, NULL, 0)) ? | |
2156 | on_failure_jump : on_failure_jump_loop; | |
4e8a9132 SM |
2157 | assert (skip_one_char (laststart) <= b); |
2158 | ||
2159 | if (!zero_times_ok && simple) | |
2160 | { /* Since simple * loops can be made faster by using | |
2161 | on_failure_keep_string_jump, we turn simple P+ | |
2162 | into PP* if P is simple. */ | |
2163 | unsigned char *p1, *p2; | |
2164 | startoffset = b - laststart; | |
2165 | GET_BUFFER_SPACE (startoffset); | |
2166 | p1 = b; p2 = laststart; | |
2167 | while (p2 < p1) | |
2168 | *b++ = *p2++; | |
2169 | zero_times_ok = 1; | |
99633e97 | 2170 | } |
4e8a9132 SM |
2171 | |
2172 | GET_BUFFER_SPACE (6); | |
2173 | if (!zero_times_ok) | |
2174 | /* A + loop. */ | |
f6a3f532 | 2175 | STORE_JUMP (ofj, b, b + 6); |
99633e97 | 2176 | else |
4e8a9132 SM |
2177 | /* Simple * loops can use on_failure_keep_string_jump |
2178 | depending on what follows. But since we don't know | |
2179 | that yet, we leave the decision up to | |
2180 | on_failure_jump_smart. */ | |
f6a3f532 | 2181 | INSERT_JUMP (simple ? on_failure_jump_smart : ofj, |
4e8a9132 | 2182 | laststart + startoffset, b + 6); |
99633e97 | 2183 | b += 3; |
4e8a9132 | 2184 | STORE_JUMP (jump, b, laststart + startoffset); |
99633e97 SM |
2185 | b += 3; |
2186 | } | |
2187 | else | |
2188 | { | |
4e8a9132 SM |
2189 | /* A simple ? pattern. */ |
2190 | assert (zero_times_ok); | |
2191 | GET_BUFFER_SPACE (3); | |
2192 | INSERT_JUMP (on_failure_jump, laststart, b + 3); | |
99633e97 SM |
2193 | b += 3; |
2194 | } | |
1c8c6d39 DL |
2195 | } |
2196 | else /* not greedy */ | |
2197 | { /* I wish the greedy and non-greedy cases could be merged. */ | |
2198 | ||
0683b6fa | 2199 | GET_BUFFER_SPACE (7); /* We might use less. */ |
1c8c6d39 DL |
2200 | if (many_times_ok) |
2201 | { | |
f6a3f532 SM |
2202 | boolean emptyp = analyse_first (laststart, b, NULL, 0); |
2203 | ||
505bde11 | 2204 | /* The non-greedy multiple match looks like a repeat..until: |
1c8c6d39 | 2205 | we only need a conditional jump at the end of the loop */ |
f6a3f532 SM |
2206 | if (emptyp) BUF_PUSH (no_op); |
2207 | STORE_JUMP (emptyp ? on_failure_jump_nastyloop | |
2208 | : on_failure_jump, b, laststart); | |
1c8c6d39 DL |
2209 | b += 3; |
2210 | if (zero_times_ok) | |
2211 | { | |
2212 | /* The repeat...until naturally matches one or more. | |
2213 | To also match zero times, we need to first jump to | |
2214 | the end of the loop (its conditional jump). */ | |
1c8c6d39 DL |
2215 | INSERT_JUMP (jump, laststart, b); |
2216 | b += 3; | |
2217 | } | |
2218 | } | |
2219 | else | |
2220 | { | |
2221 | /* non-greedy a?? */ | |
1c8c6d39 DL |
2222 | INSERT_JUMP (jump, laststart, b + 3); |
2223 | b += 3; | |
2224 | INSERT_JUMP (on_failure_jump, laststart, laststart + 6); | |
2225 | b += 3; | |
2226 | } | |
2227 | } | |
2228 | } | |
4e8a9132 | 2229 | pending_exact = 0; |
fa9a63c5 RM |
2230 | break; |
2231 | ||
2232 | ||
2233 | case '.': | |
25fe55af RS |
2234 | laststart = b; |
2235 | BUF_PUSH (anychar); | |
2236 | break; | |
fa9a63c5 RM |
2237 | |
2238 | ||
25fe55af RS |
2239 | case '[': |
2240 | { | |
b18215fc | 2241 | CLEAR_RANGE_TABLE_WORK_USED (range_table_work); |
fa9a63c5 | 2242 | |
25fe55af | 2243 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
fa9a63c5 | 2244 | |
25fe55af RS |
2245 | /* Ensure that we have enough space to push a charset: the |
2246 | opcode, the length count, and the bitset; 34 bytes in all. */ | |
fa9a63c5 RM |
2247 | GET_BUFFER_SPACE (34); |
2248 | ||
25fe55af | 2249 | laststart = b; |
e318085a | 2250 | |
25fe55af RS |
2251 | /* We test `*p == '^' twice, instead of using an if |
2252 | statement, so we only need one BUF_PUSH. */ | |
2253 | BUF_PUSH (*p == '^' ? charset_not : charset); | |
2254 | if (*p == '^') | |
2255 | p++; | |
e318085a | 2256 | |
25fe55af RS |
2257 | /* Remember the first position in the bracket expression. */ |
2258 | p1 = p; | |
e318085a | 2259 | |
25fe55af RS |
2260 | /* Push the number of bytes in the bitmap. */ |
2261 | BUF_PUSH ((1 << BYTEWIDTH) / BYTEWIDTH); | |
e318085a | 2262 | |
25fe55af RS |
2263 | /* Clear the whole map. */ |
2264 | bzero (b, (1 << BYTEWIDTH) / BYTEWIDTH); | |
e318085a | 2265 | |
25fe55af RS |
2266 | /* charset_not matches newline according to a syntax bit. */ |
2267 | if ((re_opcode_t) b[-2] == charset_not | |
2268 | && (syntax & RE_HAT_LISTS_NOT_NEWLINE)) | |
2269 | SET_LIST_BIT ('\n'); | |
fa9a63c5 | 2270 | |
25fe55af RS |
2271 | /* Read in characters and ranges, setting map bits. */ |
2272 | for (;;) | |
2273 | { | |
b18215fc | 2274 | boolean escaped_char = false; |
2d1675e4 | 2275 | const unsigned char *p2 = p; |
e318085a | 2276 | |
25fe55af | 2277 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
e318085a | 2278 | |
25fe55af | 2279 | PATFETCH (c); |
e318085a | 2280 | |
25fe55af RS |
2281 | /* \ might escape characters inside [...] and [^...]. */ |
2282 | if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\') | |
2283 | { | |
2284 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
e318085a RS |
2285 | |
2286 | PATFETCH (c); | |
b18215fc | 2287 | escaped_char = true; |
25fe55af | 2288 | } |
b18215fc RS |
2289 | else |
2290 | { | |
657fcfbd RS |
2291 | /* Could be the end of the bracket expression. If it's |
2292 | not (i.e., when the bracket expression is `[]' so | |
2293 | far), the ']' character bit gets set way below. */ | |
2d1675e4 | 2294 | if (c == ']' && p2 != p1) |
657fcfbd | 2295 | break; |
25fe55af | 2296 | } |
b18215fc | 2297 | |
b18215fc RS |
2298 | /* What should we do for the character which is |
2299 | greater than 0x7F, but not BASE_LEADING_CODE_P? | |
2300 | XXX */ | |
2301 | ||
25fe55af RS |
2302 | /* See if we're at the beginning of a possible character |
2303 | class. */ | |
b18215fc | 2304 | |
2d1675e4 SM |
2305 | if (!escaped_char && |
2306 | syntax & RE_CHAR_CLASSES && c == '[' && *p == ':') | |
657fcfbd RS |
2307 | { |
2308 | /* Leave room for the null. */ | |
25fe55af | 2309 | char str[CHAR_CLASS_MAX_LENGTH + 1]; |
ed0767d8 | 2310 | const unsigned char *class_beg; |
b18215fc | 2311 | |
25fe55af RS |
2312 | PATFETCH (c); |
2313 | c1 = 0; | |
ed0767d8 | 2314 | class_beg = p; |
b18215fc | 2315 | |
25fe55af RS |
2316 | /* If pattern is `[[:'. */ |
2317 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); | |
b18215fc | 2318 | |
25fe55af RS |
2319 | for (;;) |
2320 | { | |
2321 | PATFETCH (c); | |
2322 | if (c == ':' || c == ']' || p == pend | |
2323 | || c1 == CHAR_CLASS_MAX_LENGTH) | |
2324 | break; | |
2325 | str[c1++] = c; | |
2326 | } | |
2327 | str[c1] = '\0'; | |
b18215fc RS |
2328 | |
2329 | /* If isn't a word bracketed by `[:' and `:]': | |
2330 | undo the ending character, the letters, and | |
2331 | leave the leading `:' and `[' (but set bits for | |
2332 | them). */ | |
25fe55af RS |
2333 | if (c == ':' && *p == ']') |
2334 | { | |
2335 | int ch; | |
2336 | boolean is_alnum = STREQ (str, "alnum"); | |
2337 | boolean is_alpha = STREQ (str, "alpha"); | |
f71b19b6 | 2338 | boolean is_ascii = STREQ (str, "ascii"); |
25fe55af RS |
2339 | boolean is_blank = STREQ (str, "blank"); |
2340 | boolean is_cntrl = STREQ (str, "cntrl"); | |
2341 | boolean is_digit = STREQ (str, "digit"); | |
2342 | boolean is_graph = STREQ (str, "graph"); | |
2343 | boolean is_lower = STREQ (str, "lower"); | |
f71b19b6 DL |
2344 | boolean is_multibyte = STREQ (str, "multibyte"); |
2345 | boolean is_nonascii = STREQ (str, "nonascii"); | |
25fe55af RS |
2346 | boolean is_print = STREQ (str, "print"); |
2347 | boolean is_punct = STREQ (str, "punct"); | |
2348 | boolean is_space = STREQ (str, "space"); | |
f71b19b6 | 2349 | boolean is_unibyte = STREQ (str, "unibyte"); |
25fe55af | 2350 | boolean is_upper = STREQ (str, "upper"); |
96cc36cc | 2351 | boolean is_word = STREQ (str, "word"); |
f71b19b6 | 2352 | boolean is_xdigit = STREQ (str, "xdigit"); |
25fe55af RS |
2353 | |
2354 | if (!IS_CHAR_CLASS (str)) | |
fa9a63c5 RM |
2355 | FREE_STACK_RETURN (REG_ECTYPE); |
2356 | ||
25fe55af RS |
2357 | /* Throw away the ] at the end of the character |
2358 | class. */ | |
2359 | PATFETCH (c); | |
fa9a63c5 | 2360 | |
25fe55af | 2361 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
fa9a63c5 | 2362 | |
96cc36cc RS |
2363 | /* Most character classes in a multibyte match |
2364 | just set a flag. Exceptions are is_blank, | |
2365 | is_digit, is_cntrl, and is_xdigit, since | |
2366 | they can only match ASCII characters. We | |
2367 | don't need to handle them for multibyte. */ | |
2368 | ||
2d1675e4 | 2369 | if (multibyte) |
96cc36cc RS |
2370 | { |
2371 | int bit = 0; | |
2372 | ||
2373 | if (is_alnum) bit = BIT_ALNUM; | |
2374 | if (is_alpha) bit = BIT_ALPHA; | |
f71b19b6 | 2375 | if (is_ascii) bit = BIT_ASCII; |
96cc36cc RS |
2376 | if (is_graph) bit = BIT_GRAPH; |
2377 | if (is_lower) bit = BIT_LOWER; | |
f71b19b6 DL |
2378 | if (is_multibyte) bit = BIT_MULTIBYTE; |
2379 | if (is_nonascii) bit = BIT_NONASCII; | |
96cc36cc RS |
2380 | if (is_print) bit = BIT_PRINT; |
2381 | if (is_punct) bit = BIT_PUNCT; | |
2382 | if (is_space) bit = BIT_SPACE; | |
f71b19b6 | 2383 | if (is_unibyte) bit = BIT_UNIBYTE; |
96cc36cc RS |
2384 | if (is_upper) bit = BIT_UPPER; |
2385 | if (is_word) bit = BIT_WORD; | |
2386 | if (bit) | |
2387 | SET_RANGE_TABLE_WORK_AREA_BIT (range_table_work, | |
2388 | bit); | |
2389 | } | |
2390 | ||
2391 | /* Handle character classes for ASCII characters. */ | |
25fe55af RS |
2392 | for (ch = 0; ch < 1 << BYTEWIDTH; ch++) |
2393 | { | |
7ae68633 | 2394 | int translated = TRANSLATE (ch); |
fa9a63c5 RM |
2395 | /* This was split into 3 if's to |
2396 | avoid an arbitrary limit in some compiler. */ | |
25fe55af RS |
2397 | if ( (is_alnum && ISALNUM (ch)) |
2398 | || (is_alpha && ISALPHA (ch)) | |
2399 | || (is_blank && ISBLANK (ch)) | |
2400 | || (is_cntrl && ISCNTRL (ch))) | |
7ae68633 | 2401 | SET_LIST_BIT (translated); |
fa9a63c5 | 2402 | if ( (is_digit && ISDIGIT (ch)) |
25fe55af RS |
2403 | || (is_graph && ISGRAPH (ch)) |
2404 | || (is_lower && ISLOWER (ch)) | |
2405 | || (is_print && ISPRINT (ch))) | |
7ae68633 | 2406 | SET_LIST_BIT (translated); |
fa9a63c5 | 2407 | if ( (is_punct && ISPUNCT (ch)) |
25fe55af RS |
2408 | || (is_space && ISSPACE (ch)) |
2409 | || (is_upper && ISUPPER (ch)) | |
2410 | || (is_xdigit && ISXDIGIT (ch))) | |
7ae68633 | 2411 | SET_LIST_BIT (translated); |
f71b19b6 DL |
2412 | if ( (is_ascii && IS_REAL_ASCII (ch)) |
2413 | || (is_nonascii && !IS_REAL_ASCII (ch)) | |
2414 | || (is_unibyte && ISUNIBYTE (ch)) | |
2415 | || (is_multibyte && !ISUNIBYTE (ch))) | |
2416 | SET_LIST_BIT (translated); | |
2417 | ||
96cc36cc RS |
2418 | if ( (is_word && ISWORD (ch))) |
2419 | SET_LIST_BIT (translated); | |
25fe55af | 2420 | } |
b18215fc RS |
2421 | |
2422 | /* Repeat the loop. */ | |
2423 | continue; | |
25fe55af RS |
2424 | } |
2425 | else | |
2426 | { | |
ed0767d8 SM |
2427 | /* Go back to right after the "[:". */ |
2428 | p = class_beg; | |
25fe55af | 2429 | SET_LIST_BIT ('['); |
b18215fc RS |
2430 | |
2431 | /* Because the `:' may starts the range, we | |
2432 | can't simply set bit and repeat the loop. | |
25fe55af | 2433 | Instead, just set it to C and handle below. */ |
b18215fc | 2434 | c = ':'; |
25fe55af RS |
2435 | } |
2436 | } | |
b18215fc RS |
2437 | |
2438 | if (p < pend && p[0] == '-' && p[1] != ']') | |
2439 | { | |
2440 | ||
2441 | /* Discard the `-'. */ | |
2442 | PATFETCH (c1); | |
2443 | ||
2444 | /* Fetch the character which ends the range. */ | |
2445 | PATFETCH (c1); | |
b18215fc | 2446 | |
b54f61ed | 2447 | if (SINGLE_BYTE_CHAR_P (c)) |
e934739e | 2448 | { |
b54f61ed KH |
2449 | if (! SINGLE_BYTE_CHAR_P (c1)) |
2450 | { | |
2451 | /* Handle a range such as \177-\377 in | |
2452 | multibyte mode. Split that into two | |
2453 | ranges, the low one ending at 0237, and | |
2454 | the high one starting at the smallest | |
2455 | character in the charset of C1 and | |
2456 | ending at C1. */ | |
2457 | int charset = CHAR_CHARSET (c1); | |
2458 | int c2 = MAKE_CHAR (charset, 0, 0); | |
2459 | ||
2460 | SET_RANGE_TABLE_WORK_AREA (range_table_work, | |
2461 | c2, c1); | |
2462 | c1 = 0237; | |
2463 | } | |
e934739e RS |
2464 | } |
2465 | else if (!SAME_CHARSET_P (c, c1)) | |
b18215fc | 2466 | FREE_STACK_RETURN (REG_ERANGE); |
e318085a | 2467 | } |
25fe55af | 2468 | else |
b18215fc RS |
2469 | /* Range from C to C. */ |
2470 | c1 = c; | |
2471 | ||
2472 | /* Set the range ... */ | |
2473 | if (SINGLE_BYTE_CHAR_P (c)) | |
2474 | /* ... into bitmap. */ | |
25fe55af | 2475 | { |
b18215fc RS |
2476 | unsigned this_char; |
2477 | int range_start = c, range_end = c1; | |
2478 | ||
2479 | /* If the start is after the end, the range is empty. */ | |
2480 | if (range_start > range_end) | |
2481 | { | |
2482 | if (syntax & RE_NO_EMPTY_RANGES) | |
2483 | FREE_STACK_RETURN (REG_ERANGE); | |
2484 | /* Else, repeat the loop. */ | |
2485 | } | |
2486 | else | |
2487 | { | |
2488 | for (this_char = range_start; this_char <= range_end; | |
2489 | this_char++) | |
2490 | SET_LIST_BIT (TRANSLATE (this_char)); | |
e934739e | 2491 | } |
25fe55af | 2492 | } |
e318085a | 2493 | else |
b18215fc RS |
2494 | /* ... into range table. */ |
2495 | SET_RANGE_TABLE_WORK_AREA (range_table_work, c, c1); | |
e318085a RS |
2496 | } |
2497 | ||
25fe55af RS |
2498 | /* Discard any (non)matching list bytes that are all 0 at the |
2499 | end of the map. Decrease the map-length byte too. */ | |
2500 | while ((int) b[-1] > 0 && b[b[-1] - 1] == 0) | |
2501 | b[-1]--; | |
2502 | b += b[-1]; | |
fa9a63c5 | 2503 | |
96cc36cc RS |
2504 | /* Build real range table from work area. */ |
2505 | if (RANGE_TABLE_WORK_USED (range_table_work) | |
2506 | || RANGE_TABLE_WORK_BITS (range_table_work)) | |
b18215fc RS |
2507 | { |
2508 | int i; | |
2509 | int used = RANGE_TABLE_WORK_USED (range_table_work); | |
fa9a63c5 | 2510 | |
b18215fc | 2511 | /* Allocate space for COUNT + RANGE_TABLE. Needs two |
96cc36cc RS |
2512 | bytes for flags, two for COUNT, and three bytes for |
2513 | each character. */ | |
2514 | GET_BUFFER_SPACE (4 + used * 3); | |
fa9a63c5 | 2515 | |
b18215fc RS |
2516 | /* Indicate the existence of range table. */ |
2517 | laststart[1] |= 0x80; | |
fa9a63c5 | 2518 | |
96cc36cc RS |
2519 | /* Store the character class flag bits into the range table. |
2520 | If not in emacs, these flag bits are always 0. */ | |
2521 | *b++ = RANGE_TABLE_WORK_BITS (range_table_work) & 0xff; | |
2522 | *b++ = RANGE_TABLE_WORK_BITS (range_table_work) >> 8; | |
2523 | ||
b18215fc RS |
2524 | STORE_NUMBER_AND_INCR (b, used / 2); |
2525 | for (i = 0; i < used; i++) | |
2526 | STORE_CHARACTER_AND_INCR | |
2527 | (b, RANGE_TABLE_WORK_ELT (range_table_work, i)); | |
2528 | } | |
25fe55af RS |
2529 | } |
2530 | break; | |
fa9a63c5 RM |
2531 | |
2532 | ||
b18215fc | 2533 | case '(': |
25fe55af RS |
2534 | if (syntax & RE_NO_BK_PARENS) |
2535 | goto handle_open; | |
2536 | else | |
2537 | goto normal_char; | |
fa9a63c5 RM |
2538 | |
2539 | ||
25fe55af RS |
2540 | case ')': |
2541 | if (syntax & RE_NO_BK_PARENS) | |
2542 | goto handle_close; | |
2543 | else | |
2544 | goto normal_char; | |
e318085a RS |
2545 | |
2546 | ||
25fe55af RS |
2547 | case '\n': |
2548 | if (syntax & RE_NEWLINE_ALT) | |
2549 | goto handle_alt; | |
2550 | else | |
2551 | goto normal_char; | |
e318085a RS |
2552 | |
2553 | ||
b18215fc | 2554 | case '|': |
25fe55af RS |
2555 | if (syntax & RE_NO_BK_VBAR) |
2556 | goto handle_alt; | |
2557 | else | |
2558 | goto normal_char; | |
2559 | ||
2560 | ||
2561 | case '{': | |
2562 | if (syntax & RE_INTERVALS && syntax & RE_NO_BK_BRACES) | |
2563 | goto handle_interval; | |
2564 | else | |
2565 | goto normal_char; | |
2566 | ||
2567 | ||
2568 | case '\\': | |
2569 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
2570 | ||
2571 | /* Do not translate the character after the \, so that we can | |
2572 | distinguish, e.g., \B from \b, even if we normally would | |
2573 | translate, e.g., B to b. */ | |
2574 | PATFETCH_RAW (c); | |
2575 | ||
2576 | switch (c) | |
2577 | { | |
2578 | case '(': | |
2579 | if (syntax & RE_NO_BK_PARENS) | |
2580 | goto normal_backslash; | |
2581 | ||
2582 | handle_open: | |
505bde11 SM |
2583 | { |
2584 | int shy = 0; | |
2585 | if (p+1 < pend) | |
2586 | { | |
2587 | /* Look for a special (?...) construct */ | |
ed0767d8 | 2588 | if ((syntax & RE_SHY_GROUPS) && *p == '?') |
505bde11 | 2589 | { |
ed0767d8 | 2590 | PATFETCH (c); /* Gobble up the '?'. */ |
505bde11 SM |
2591 | PATFETCH (c); |
2592 | switch (c) | |
2593 | { | |
2594 | case ':': shy = 1; break; | |
2595 | default: | |
2596 | /* Only (?:...) is supported right now. */ | |
2597 | FREE_STACK_RETURN (REG_BADPAT); | |
2598 | } | |
2599 | } | |
505bde11 SM |
2600 | } |
2601 | ||
2602 | if (!shy) | |
2603 | { | |
2604 | bufp->re_nsub++; | |
2605 | regnum++; | |
2606 | } | |
25fe55af | 2607 | |
99633e97 SM |
2608 | if (COMPILE_STACK_FULL) |
2609 | { | |
2610 | RETALLOC (compile_stack.stack, compile_stack.size << 1, | |
2611 | compile_stack_elt_t); | |
2612 | if (compile_stack.stack == NULL) return REG_ESPACE; | |
25fe55af | 2613 | |
99633e97 SM |
2614 | compile_stack.size <<= 1; |
2615 | } | |
25fe55af | 2616 | |
99633e97 SM |
2617 | /* These are the values to restore when we hit end of this |
2618 | group. They are all relative offsets, so that if the | |
2619 | whole pattern moves because of realloc, they will still | |
2620 | be valid. */ | |
2621 | COMPILE_STACK_TOP.begalt_offset = begalt - bufp->buffer; | |
2622 | COMPILE_STACK_TOP.fixup_alt_jump | |
2623 | = fixup_alt_jump ? fixup_alt_jump - bufp->buffer + 1 : 0; | |
2624 | COMPILE_STACK_TOP.laststart_offset = b - bufp->buffer; | |
2625 | COMPILE_STACK_TOP.regnum = shy ? -regnum : regnum; | |
2626 | ||
2627 | /* Do not push a | |
2628 | start_memory for groups beyond the last one we can | |
2629 | represent in the compiled pattern. */ | |
2630 | if (regnum <= MAX_REGNUM && !shy) | |
2631 | BUF_PUSH_2 (start_memory, regnum); | |
2632 | ||
2633 | compile_stack.avail++; | |
2634 | ||
2635 | fixup_alt_jump = 0; | |
2636 | laststart = 0; | |
2637 | begalt = b; | |
2638 | /* If we've reached MAX_REGNUM groups, then this open | |
2639 | won't actually generate any code, so we'll have to | |
2640 | clear pending_exact explicitly. */ | |
2641 | pending_exact = 0; | |
2642 | break; | |
505bde11 | 2643 | } |
25fe55af RS |
2644 | |
2645 | case ')': | |
2646 | if (syntax & RE_NO_BK_PARENS) goto normal_backslash; | |
2647 | ||
2648 | if (COMPILE_STACK_EMPTY) | |
505bde11 SM |
2649 | { |
2650 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) | |
2651 | goto normal_backslash; | |
2652 | else | |
2653 | FREE_STACK_RETURN (REG_ERPAREN); | |
2654 | } | |
25fe55af RS |
2655 | |
2656 | handle_close: | |
505bde11 | 2657 | FIXUP_ALT_JUMP (); |
25fe55af RS |
2658 | |
2659 | /* See similar code for backslashed left paren above. */ | |
2660 | if (COMPILE_STACK_EMPTY) | |
505bde11 SM |
2661 | { |
2662 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) | |
2663 | goto normal_char; | |
2664 | else | |
2665 | FREE_STACK_RETURN (REG_ERPAREN); | |
2666 | } | |
25fe55af RS |
2667 | |
2668 | /* Since we just checked for an empty stack above, this | |
2669 | ``can't happen''. */ | |
2670 | assert (compile_stack.avail != 0); | |
2671 | { | |
2672 | /* We don't just want to restore into `regnum', because | |
2673 | later groups should continue to be numbered higher, | |
2674 | as in `(ab)c(de)' -- the second group is #2. */ | |
2675 | regnum_t this_group_regnum; | |
2676 | ||
2677 | compile_stack.avail--; | |
2678 | begalt = bufp->buffer + COMPILE_STACK_TOP.begalt_offset; | |
2679 | fixup_alt_jump | |
2680 | = COMPILE_STACK_TOP.fixup_alt_jump | |
2681 | ? bufp->buffer + COMPILE_STACK_TOP.fixup_alt_jump - 1 | |
2682 | : 0; | |
2683 | laststart = bufp->buffer + COMPILE_STACK_TOP.laststart_offset; | |
2684 | this_group_regnum = COMPILE_STACK_TOP.regnum; | |
b18215fc RS |
2685 | /* If we've reached MAX_REGNUM groups, then this open |
2686 | won't actually generate any code, so we'll have to | |
2687 | clear pending_exact explicitly. */ | |
2688 | pending_exact = 0; | |
e318085a | 2689 | |
25fe55af RS |
2690 | /* We're at the end of the group, so now we know how many |
2691 | groups were inside this one. */ | |
505bde11 SM |
2692 | if (this_group_regnum <= MAX_REGNUM && this_group_regnum > 0) |
2693 | BUF_PUSH_2 (stop_memory, this_group_regnum); | |
25fe55af RS |
2694 | } |
2695 | break; | |
2696 | ||
2697 | ||
2698 | case '|': /* `\|'. */ | |
2699 | if (syntax & RE_LIMITED_OPS || syntax & RE_NO_BK_VBAR) | |
2700 | goto normal_backslash; | |
2701 | handle_alt: | |
2702 | if (syntax & RE_LIMITED_OPS) | |
2703 | goto normal_char; | |
2704 | ||
2705 | /* Insert before the previous alternative a jump which | |
2706 | jumps to this alternative if the former fails. */ | |
2707 | GET_BUFFER_SPACE (3); | |
2708 | INSERT_JUMP (on_failure_jump, begalt, b + 6); | |
2709 | pending_exact = 0; | |
2710 | b += 3; | |
2711 | ||
2712 | /* The alternative before this one has a jump after it | |
2713 | which gets executed if it gets matched. Adjust that | |
2714 | jump so it will jump to this alternative's analogous | |
2715 | jump (put in below, which in turn will jump to the next | |
2716 | (if any) alternative's such jump, etc.). The last such | |
2717 | jump jumps to the correct final destination. A picture: | |
2718 | _____ _____ | |
2719 | | | | | | |
2720 | | v | v | |
2721 | a | b | c | |
2722 | ||
2723 | If we are at `b', then fixup_alt_jump right now points to a | |
2724 | three-byte space after `a'. We'll put in the jump, set | |
2725 | fixup_alt_jump to right after `b', and leave behind three | |
2726 | bytes which we'll fill in when we get to after `c'. */ | |
2727 | ||
505bde11 | 2728 | FIXUP_ALT_JUMP (); |
25fe55af RS |
2729 | |
2730 | /* Mark and leave space for a jump after this alternative, | |
2731 | to be filled in later either by next alternative or | |
2732 | when know we're at the end of a series of alternatives. */ | |
2733 | fixup_alt_jump = b; | |
2734 | GET_BUFFER_SPACE (3); | |
2735 | b += 3; | |
2736 | ||
2737 | laststart = 0; | |
2738 | begalt = b; | |
2739 | break; | |
2740 | ||
2741 | ||
2742 | case '{': | |
2743 | /* If \{ is a literal. */ | |
2744 | if (!(syntax & RE_INTERVALS) | |
2745 | /* If we're at `\{' and it's not the open-interval | |
2746 | operator. */ | |
ed0767d8 SM |
2747 | || (syntax & RE_NO_BK_BRACES) |
2748 | /* What is that? -sm */ | |
2749 | /* || (p - 2 == pattern && p == pend) */) | |
25fe55af RS |
2750 | goto normal_backslash; |
2751 | ||
2752 | handle_interval: | |
2753 | { | |
2754 | /* If got here, then the syntax allows intervals. */ | |
2755 | ||
2756 | /* At least (most) this many matches must be made. */ | |
99633e97 | 2757 | int lower_bound = 0, upper_bound = -1; |
25fe55af | 2758 | |
ed0767d8 | 2759 | beg_interval = p; |
25fe55af RS |
2760 | |
2761 | if (p == pend) | |
2762 | { | |
2763 | if (syntax & RE_NO_BK_BRACES) | |
2764 | goto unfetch_interval; | |
2765 | else | |
2766 | FREE_STACK_RETURN (REG_EBRACE); | |
2767 | } | |
2768 | ||
2769 | GET_UNSIGNED_NUMBER (lower_bound); | |
2770 | ||
2771 | if (c == ',') | |
ed0767d8 | 2772 | GET_UNSIGNED_NUMBER (upper_bound); |
25fe55af RS |
2773 | else |
2774 | /* Interval such as `{1}' => match exactly once. */ | |
2775 | upper_bound = lower_bound; | |
2776 | ||
2777 | if (lower_bound < 0 || upper_bound > RE_DUP_MAX | |
ed0767d8 | 2778 | || (upper_bound >= 0 && lower_bound > upper_bound)) |
25fe55af RS |
2779 | { |
2780 | if (syntax & RE_NO_BK_BRACES) | |
2781 | goto unfetch_interval; | |
2782 | else | |
2783 | FREE_STACK_RETURN (REG_BADBR); | |
2784 | } | |
2785 | ||
2786 | if (!(syntax & RE_NO_BK_BRACES)) | |
2787 | { | |
2788 | if (c != '\\') FREE_STACK_RETURN (REG_EBRACE); | |
2789 | ||
2790 | PATFETCH (c); | |
2791 | } | |
2792 | ||
2793 | if (c != '}') | |
2794 | { | |
2795 | if (syntax & RE_NO_BK_BRACES) | |
2796 | goto unfetch_interval; | |
2797 | else | |
2798 | FREE_STACK_RETURN (REG_BADBR); | |
2799 | } | |
2800 | ||
2801 | /* We just parsed a valid interval. */ | |
2802 | ||
2803 | /* If it's invalid to have no preceding re. */ | |
2804 | if (!laststart) | |
2805 | { | |
2806 | if (syntax & RE_CONTEXT_INVALID_OPS) | |
2807 | FREE_STACK_RETURN (REG_BADRPT); | |
2808 | else if (syntax & RE_CONTEXT_INDEP_OPS) | |
2809 | laststart = b; | |
2810 | else | |
2811 | goto unfetch_interval; | |
2812 | } | |
2813 | ||
25fe55af | 2814 | if (upper_bound == 0) |
ed0767d8 SM |
2815 | /* If the upper bound is zero, just drop the sub pattern |
2816 | altogether. */ | |
2817 | b = laststart; | |
2818 | else if (lower_bound == 1 && upper_bound == 1) | |
2819 | /* Just match it once: nothing to do here. */ | |
2820 | ; | |
25fe55af RS |
2821 | |
2822 | /* Otherwise, we have a nontrivial interval. When | |
2823 | we're all done, the pattern will look like: | |
2824 | set_number_at <jump count> <upper bound> | |
2825 | set_number_at <succeed_n count> <lower bound> | |
2826 | succeed_n <after jump addr> <succeed_n count> | |
2827 | <body of loop> | |
2828 | jump_n <succeed_n addr> <jump count> | |
2829 | (The upper bound and `jump_n' are omitted if | |
2830 | `upper_bound' is 1, though.) */ | |
2831 | else | |
2832 | { /* If the upper bound is > 1, we need to insert | |
2833 | more at the end of the loop. */ | |
ed0767d8 SM |
2834 | unsigned int nbytes = (upper_bound < 0 ? 3 |
2835 | : upper_bound > 1 ? 5 : 0); | |
2836 | unsigned int startoffset = 0; | |
2837 | ||
2838 | GET_BUFFER_SPACE (20); /* We might use less. */ | |
2839 | ||
2840 | if (lower_bound == 0) | |
2841 | { | |
2842 | /* A succeed_n that starts with 0 is really a | |
2843 | a simple on_failure_jump_loop. */ | |
2844 | INSERT_JUMP (on_failure_jump_loop, laststart, | |
2845 | b + 3 + nbytes); | |
2846 | b += 3; | |
2847 | } | |
2848 | else | |
2849 | { | |
2850 | /* Initialize lower bound of the `succeed_n', even | |
2851 | though it will be set during matching by its | |
2852 | attendant `set_number_at' (inserted next), | |
2853 | because `re_compile_fastmap' needs to know. | |
2854 | Jump to the `jump_n' we might insert below. */ | |
2855 | INSERT_JUMP2 (succeed_n, laststart, | |
2856 | b + 5 + nbytes, | |
2857 | lower_bound); | |
2858 | b += 5; | |
2859 | ||
2860 | /* Code to initialize the lower bound. Insert | |
2861 | before the `succeed_n'. The `5' is the last two | |
2862 | bytes of this `set_number_at', plus 3 bytes of | |
2863 | the following `succeed_n'. */ | |
2864 | insert_op2 (set_number_at, laststart, 5, lower_bound, b); | |
2865 | b += 5; | |
2866 | startoffset += 5; | |
2867 | } | |
2868 | ||
2869 | if (upper_bound < 0) | |
2870 | { | |
2871 | /* A negative upper bound stands for infinity, | |
2872 | in which case it degenerates to a plain jump. */ | |
2873 | STORE_JUMP (jump, b, laststart + startoffset); | |
2874 | b += 3; | |
2875 | } | |
2876 | else if (upper_bound > 1) | |
25fe55af RS |
2877 | { /* More than one repetition is allowed, so |
2878 | append a backward jump to the `succeed_n' | |
2879 | that starts this interval. | |
2880 | ||
2881 | When we've reached this during matching, | |
2882 | we'll have matched the interval once, so | |
2883 | jump back only `upper_bound - 1' times. */ | |
ed0767d8 | 2884 | STORE_JUMP2 (jump_n, b, laststart + startoffset, |
25fe55af RS |
2885 | upper_bound - 1); |
2886 | b += 5; | |
2887 | ||
2888 | /* The location we want to set is the second | |
2889 | parameter of the `jump_n'; that is `b-2' as | |
2890 | an absolute address. `laststart' will be | |
2891 | the `set_number_at' we're about to insert; | |
2892 | `laststart+3' the number to set, the source | |
2893 | for the relative address. But we are | |
2894 | inserting into the middle of the pattern -- | |
2895 | so everything is getting moved up by 5. | |
2896 | Conclusion: (b - 2) - (laststart + 3) + 5, | |
2897 | i.e., b - laststart. | |
2898 | ||
2899 | We insert this at the beginning of the loop | |
2900 | so that if we fail during matching, we'll | |
2901 | reinitialize the bounds. */ | |
2902 | insert_op2 (set_number_at, laststart, b - laststart, | |
2903 | upper_bound - 1, b); | |
2904 | b += 5; | |
2905 | } | |
2906 | } | |
2907 | pending_exact = 0; | |
2908 | beg_interval = NULL; | |
2909 | } | |
2910 | break; | |
2911 | ||
2912 | unfetch_interval: | |
2913 | /* If an invalid interval, match the characters as literals. */ | |
2914 | assert (beg_interval); | |
2915 | p = beg_interval; | |
2916 | beg_interval = NULL; | |
2917 | ||
2918 | /* normal_char and normal_backslash need `c'. */ | |
ed0767d8 | 2919 | c = '{'; |
25fe55af RS |
2920 | |
2921 | if (!(syntax & RE_NO_BK_BRACES)) | |
2922 | { | |
ed0767d8 SM |
2923 | assert (p > pattern && p[-1] == '\\'); |
2924 | goto normal_backslash; | |
25fe55af | 2925 | } |
ed0767d8 SM |
2926 | else |
2927 | goto normal_char; | |
e318085a | 2928 | |
b18215fc | 2929 | #ifdef emacs |
25fe55af RS |
2930 | /* There is no way to specify the before_dot and after_dot |
2931 | operators. rms says this is ok. --karl */ | |
2932 | case '=': | |
2933 | BUF_PUSH (at_dot); | |
2934 | break; | |
2935 | ||
2936 | case 's': | |
2937 | laststart = b; | |
2938 | PATFETCH (c); | |
2939 | BUF_PUSH_2 (syntaxspec, syntax_spec_code[c]); | |
2940 | break; | |
2941 | ||
2942 | case 'S': | |
2943 | laststart = b; | |
2944 | PATFETCH (c); | |
2945 | BUF_PUSH_2 (notsyntaxspec, syntax_spec_code[c]); | |
2946 | break; | |
b18215fc RS |
2947 | |
2948 | case 'c': | |
2949 | laststart = b; | |
2950 | PATFETCH_RAW (c); | |
2951 | BUF_PUSH_2 (categoryspec, c); | |
2952 | break; | |
e318085a | 2953 | |
b18215fc RS |
2954 | case 'C': |
2955 | laststart = b; | |
2956 | PATFETCH_RAW (c); | |
2957 | BUF_PUSH_2 (notcategoryspec, c); | |
2958 | break; | |
2959 | #endif /* emacs */ | |
e318085a | 2960 | |
e318085a | 2961 | |
25fe55af RS |
2962 | case 'w': |
2963 | laststart = b; | |
1fb352e0 | 2964 | BUF_PUSH_2 (syntaxspec, Sword); |
25fe55af | 2965 | break; |
e318085a | 2966 | |
e318085a | 2967 | |
25fe55af RS |
2968 | case 'W': |
2969 | laststart = b; | |
1fb352e0 | 2970 | BUF_PUSH_2 (notsyntaxspec, Sword); |
25fe55af | 2971 | break; |
e318085a RS |
2972 | |
2973 | ||
25fe55af RS |
2974 | case '<': |
2975 | BUF_PUSH (wordbeg); | |
2976 | break; | |
e318085a | 2977 | |
25fe55af RS |
2978 | case '>': |
2979 | BUF_PUSH (wordend); | |
2980 | break; | |
e318085a | 2981 | |
25fe55af RS |
2982 | case 'b': |
2983 | BUF_PUSH (wordbound); | |
2984 | break; | |
e318085a | 2985 | |
25fe55af RS |
2986 | case 'B': |
2987 | BUF_PUSH (notwordbound); | |
2988 | break; | |
fa9a63c5 | 2989 | |
25fe55af RS |
2990 | case '`': |
2991 | BUF_PUSH (begbuf); | |
2992 | break; | |
e318085a | 2993 | |
25fe55af RS |
2994 | case '\'': |
2995 | BUF_PUSH (endbuf); | |
2996 | break; | |
e318085a | 2997 | |
25fe55af RS |
2998 | case '1': case '2': case '3': case '4': case '5': |
2999 | case '6': case '7': case '8': case '9': | |
3000 | if (syntax & RE_NO_BK_REFS) | |
3001 | goto normal_char; | |
e318085a | 3002 | |
25fe55af | 3003 | c1 = c - '0'; |
e318085a | 3004 | |
25fe55af RS |
3005 | if (c1 > regnum) |
3006 | FREE_STACK_RETURN (REG_ESUBREG); | |
e318085a | 3007 | |
25fe55af RS |
3008 | /* Can't back reference to a subexpression if inside of it. */ |
3009 | if (group_in_compile_stack (compile_stack, c1)) | |
3010 | goto normal_char; | |
e318085a | 3011 | |
25fe55af RS |
3012 | laststart = b; |
3013 | BUF_PUSH_2 (duplicate, c1); | |
3014 | break; | |
e318085a | 3015 | |
e318085a | 3016 | |
25fe55af RS |
3017 | case '+': |
3018 | case '?': | |
3019 | if (syntax & RE_BK_PLUS_QM) | |
3020 | goto handle_plus; | |
3021 | else | |
3022 | goto normal_backslash; | |
3023 | ||
3024 | default: | |
3025 | normal_backslash: | |
3026 | /* You might think it would be useful for \ to mean | |
3027 | not to translate; but if we don't translate it | |
3028 | it will never match anything. */ | |
3029 | c = TRANSLATE (c); | |
3030 | goto normal_char; | |
3031 | } | |
3032 | break; | |
fa9a63c5 RM |
3033 | |
3034 | ||
3035 | default: | |
25fe55af | 3036 | /* Expects the character in `c'. */ |
fa9a63c5 RM |
3037 | normal_char: |
3038 | /* If no exactn currently being built. */ | |
25fe55af | 3039 | if (!pending_exact |
fa9a63c5 | 3040 | |
25fe55af RS |
3041 | /* If last exactn not at current position. */ |
3042 | || pending_exact + *pending_exact + 1 != b | |
5e69f11e | 3043 | |
25fe55af | 3044 | /* We have only one byte following the exactn for the count. */ |
2d1675e4 | 3045 | || *pending_exact >= (1 << BYTEWIDTH) - MAX_MULTIBYTE_LENGTH |
fa9a63c5 | 3046 | |
25fe55af | 3047 | /* If followed by a repetition operator. */ |
9d99031f | 3048 | || (p != pend && (*p == '*' || *p == '^')) |
fa9a63c5 | 3049 | || ((syntax & RE_BK_PLUS_QM) |
9d99031f RS |
3050 | ? p + 1 < pend && *p == '\\' && (p[1] == '+' || p[1] == '?') |
3051 | : p != pend && (*p == '+' || *p == '?')) | |
fa9a63c5 | 3052 | || ((syntax & RE_INTERVALS) |
25fe55af | 3053 | && ((syntax & RE_NO_BK_BRACES) |
9d99031f RS |
3054 | ? p != pend && *p == '{' |
3055 | : p + 1 < pend && p[0] == '\\' && p[1] == '{'))) | |
fa9a63c5 RM |
3056 | { |
3057 | /* Start building a new exactn. */ | |
5e69f11e | 3058 | |
25fe55af | 3059 | laststart = b; |
fa9a63c5 RM |
3060 | |
3061 | BUF_PUSH_2 (exactn, 0); | |
3062 | pending_exact = b - 1; | |
25fe55af | 3063 | } |
5e69f11e | 3064 | |
2d1675e4 SM |
3065 | GET_BUFFER_SPACE (MAX_MULTIBYTE_LENGTH); |
3066 | { | |
3067 | int len = CHAR_STRING (c, b); | |
3068 | b += len; | |
3069 | (*pending_exact) += len; | |
3070 | } | |
3071 | ||
fa9a63c5 | 3072 | break; |
25fe55af | 3073 | } /* switch (c) */ |
fa9a63c5 RM |
3074 | } /* while p != pend */ |
3075 | ||
5e69f11e | 3076 | |
fa9a63c5 | 3077 | /* Through the pattern now. */ |
5e69f11e | 3078 | |
505bde11 | 3079 | FIXUP_ALT_JUMP (); |
fa9a63c5 | 3080 | |
5e69f11e | 3081 | if (!COMPILE_STACK_EMPTY) |
fa9a63c5 RM |
3082 | FREE_STACK_RETURN (REG_EPAREN); |
3083 | ||
3084 | /* If we don't want backtracking, force success | |
3085 | the first time we reach the end of the compiled pattern. */ | |
3086 | if (syntax & RE_NO_POSIX_BACKTRACKING) | |
3087 | BUF_PUSH (succeed); | |
3088 | ||
3089 | free (compile_stack.stack); | |
3090 | ||
3091 | /* We have succeeded; set the length of the buffer. */ | |
3092 | bufp->used = b - bufp->buffer; | |
3093 | ||
3094 | #ifdef DEBUG | |
99633e97 | 3095 | if (debug > 0) |
fa9a63c5 | 3096 | { |
505bde11 | 3097 | re_compile_fastmap (bufp); |
fa9a63c5 RM |
3098 | DEBUG_PRINT1 ("\nCompiled pattern: \n"); |
3099 | print_compiled_pattern (bufp); | |
3100 | } | |
99633e97 | 3101 | debug--; |
fa9a63c5 RM |
3102 | #endif /* DEBUG */ |
3103 | ||
3104 | #ifndef MATCH_MAY_ALLOCATE | |
3105 | /* Initialize the failure stack to the largest possible stack. This | |
3106 | isn't necessary unless we're trying to avoid calling alloca in | |
3107 | the search and match routines. */ | |
3108 | { | |
3109 | int num_regs = bufp->re_nsub + 1; | |
3110 | ||
320a2a73 | 3111 | if (fail_stack.size < re_max_failures * TYPICAL_FAILURE_SIZE) |
fa9a63c5 | 3112 | { |
a26f4ccd | 3113 | fail_stack.size = re_max_failures * TYPICAL_FAILURE_SIZE; |
fa9a63c5 | 3114 | |
fa9a63c5 RM |
3115 | if (! fail_stack.stack) |
3116 | fail_stack.stack | |
5e69f11e | 3117 | = (fail_stack_elt_t *) malloc (fail_stack.size |
fa9a63c5 RM |
3118 | * sizeof (fail_stack_elt_t)); |
3119 | else | |
3120 | fail_stack.stack | |
3121 | = (fail_stack_elt_t *) realloc (fail_stack.stack, | |
3122 | (fail_stack.size | |
3123 | * sizeof (fail_stack_elt_t))); | |
fa9a63c5 RM |
3124 | } |
3125 | ||
3126 | regex_grow_registers (num_regs); | |
3127 | } | |
3128 | #endif /* not MATCH_MAY_ALLOCATE */ | |
3129 | ||
3130 | return REG_NOERROR; | |
3131 | } /* regex_compile */ | |
3132 | \f | |
3133 | /* Subroutines for `regex_compile'. */ | |
3134 | ||
25fe55af | 3135 | /* Store OP at LOC followed by two-byte integer parameter ARG. */ |
fa9a63c5 RM |
3136 | |
3137 | static void | |
3138 | store_op1 (op, loc, arg) | |
3139 | re_opcode_t op; | |
3140 | unsigned char *loc; | |
3141 | int arg; | |
3142 | { | |
3143 | *loc = (unsigned char) op; | |
3144 | STORE_NUMBER (loc + 1, arg); | |
3145 | } | |
3146 | ||
3147 | ||
3148 | /* Like `store_op1', but for two two-byte parameters ARG1 and ARG2. */ | |
3149 | ||
3150 | static void | |
3151 | store_op2 (op, loc, arg1, arg2) | |
3152 | re_opcode_t op; | |
3153 | unsigned char *loc; | |
3154 | int arg1, arg2; | |
3155 | { | |
3156 | *loc = (unsigned char) op; | |
3157 | STORE_NUMBER (loc + 1, arg1); | |
3158 | STORE_NUMBER (loc + 3, arg2); | |
3159 | } | |
3160 | ||
3161 | ||
3162 | /* Copy the bytes from LOC to END to open up three bytes of space at LOC | |
3163 | for OP followed by two-byte integer parameter ARG. */ | |
3164 | ||
3165 | static void | |
3166 | insert_op1 (op, loc, arg, end) | |
3167 | re_opcode_t op; | |
3168 | unsigned char *loc; | |
3169 | int arg; | |
5e69f11e | 3170 | unsigned char *end; |
fa9a63c5 RM |
3171 | { |
3172 | register unsigned char *pfrom = end; | |
3173 | register unsigned char *pto = end + 3; | |
3174 | ||
3175 | while (pfrom != loc) | |
3176 | *--pto = *--pfrom; | |
5e69f11e | 3177 | |
fa9a63c5 RM |
3178 | store_op1 (op, loc, arg); |
3179 | } | |
3180 | ||
3181 | ||
3182 | /* Like `insert_op1', but for two two-byte parameters ARG1 and ARG2. */ | |
3183 | ||
3184 | static void | |
3185 | insert_op2 (op, loc, arg1, arg2, end) | |
3186 | re_opcode_t op; | |
3187 | unsigned char *loc; | |
3188 | int arg1, arg2; | |
5e69f11e | 3189 | unsigned char *end; |
fa9a63c5 RM |
3190 | { |
3191 | register unsigned char *pfrom = end; | |
3192 | register unsigned char *pto = end + 5; | |
3193 | ||
3194 | while (pfrom != loc) | |
3195 | *--pto = *--pfrom; | |
5e69f11e | 3196 | |
fa9a63c5 RM |
3197 | store_op2 (op, loc, arg1, arg2); |
3198 | } | |
3199 | ||
3200 | ||
3201 | /* P points to just after a ^ in PATTERN. Return true if that ^ comes | |
3202 | after an alternative or a begin-subexpression. We assume there is at | |
3203 | least one character before the ^. */ | |
3204 | ||
3205 | static boolean | |
3206 | at_begline_loc_p (pattern, p, syntax) | |
99633e97 | 3207 | const unsigned char *pattern, *p; |
fa9a63c5 RM |
3208 | reg_syntax_t syntax; |
3209 | { | |
4e8a9132 | 3210 | const unsigned char *prev = p - 2; |
fa9a63c5 | 3211 | boolean prev_prev_backslash = prev > pattern && prev[-1] == '\\'; |
5e69f11e | 3212 | |
fa9a63c5 RM |
3213 | return |
3214 | /* After a subexpression? */ | |
3215 | (*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash)) | |
25fe55af | 3216 | /* After an alternative? */ |
d2af47df SM |
3217 | || (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash)) |
3218 | /* After a shy subexpression? */ | |
3219 | || ((syntax & RE_SHY_GROUPS) && prev - 2 >= pattern | |
3220 | && prev[-1] == '?' && prev[-2] == '(' | |
3221 | && (syntax & RE_NO_BK_PARENS | |
3222 | || (prev - 3 >= pattern && prev[-3] == '\\'))); | |
fa9a63c5 RM |
3223 | } |
3224 | ||
3225 | ||
3226 | /* The dual of at_begline_loc_p. This one is for $. We assume there is | |
3227 | at least one character after the $, i.e., `P < PEND'. */ | |
3228 | ||
3229 | static boolean | |
3230 | at_endline_loc_p (p, pend, syntax) | |
99633e97 SM |
3231 | const unsigned char *p, *pend; |
3232 | reg_syntax_t syntax; | |
fa9a63c5 | 3233 | { |
4e8a9132 | 3234 | const unsigned char *next = p; |
fa9a63c5 | 3235 | boolean next_backslash = *next == '\\'; |
4e8a9132 | 3236 | const unsigned char *next_next = p + 1 < pend ? p + 1 : 0; |
5e69f11e | 3237 | |
fa9a63c5 RM |
3238 | return |
3239 | /* Before a subexpression? */ | |
3240 | (syntax & RE_NO_BK_PARENS ? *next == ')' | |
25fe55af | 3241 | : next_backslash && next_next && *next_next == ')') |
fa9a63c5 RM |
3242 | /* Before an alternative? */ |
3243 | || (syntax & RE_NO_BK_VBAR ? *next == '|' | |
25fe55af | 3244 | : next_backslash && next_next && *next_next == '|'); |
fa9a63c5 RM |
3245 | } |
3246 | ||
3247 | ||
5e69f11e | 3248 | /* Returns true if REGNUM is in one of COMPILE_STACK's elements and |
fa9a63c5 RM |
3249 | false if it's not. */ |
3250 | ||
3251 | static boolean | |
3252 | group_in_compile_stack (compile_stack, regnum) | |
3253 | compile_stack_type compile_stack; | |
3254 | regnum_t regnum; | |
3255 | { | |
3256 | int this_element; | |
3257 | ||
5e69f11e RM |
3258 | for (this_element = compile_stack.avail - 1; |
3259 | this_element >= 0; | |
fa9a63c5 RM |
3260 | this_element--) |
3261 | if (compile_stack.stack[this_element].regnum == regnum) | |
3262 | return true; | |
3263 | ||
3264 | return false; | |
3265 | } | |
fa9a63c5 | 3266 | \f |
f6a3f532 SM |
3267 | /* analyse_first. |
3268 | If fastmap is non-NULL, go through the pattern and fill fastmap | |
3269 | with all the possible leading chars. If fastmap is NULL, don't | |
3270 | bother filling it up (obviously) and only return whether the | |
3271 | pattern could potentially match the empty string. | |
3272 | ||
3273 | Return 1 if p..pend might match the empty string. | |
3274 | Return 0 if p..pend matches at least one char. | |
3275 | Return -1 if p..pend matches at least one char, but fastmap was not | |
3276 | updated accurately. | |
3277 | Return -2 if an error occurred. */ | |
3278 | ||
3279 | static int | |
3280 | analyse_first (p, pend, fastmap, multibyte) | |
3281 | unsigned char *p, *pend; | |
3282 | char *fastmap; | |
3283 | const int multibyte; | |
fa9a63c5 | 3284 | { |
505bde11 | 3285 | int j, k; |
1fb352e0 | 3286 | boolean not; |
fa9a63c5 RM |
3287 | #ifdef MATCH_MAY_ALLOCATE |
3288 | fail_stack_type fail_stack; | |
3289 | #endif | |
3290 | #ifndef REGEX_MALLOC | |
3291 | char *destination; | |
3292 | #endif | |
5e69f11e | 3293 | |
99633e97 | 3294 | #if defined (REL_ALLOC) && defined (REGEX_MALLOC) |
fa9a63c5 RM |
3295 | /* This holds the pointer to the failure stack, when |
3296 | it is allocated relocatably. */ | |
3297 | fail_stack_elt_t *failure_stack_ptr; | |
99633e97 | 3298 | #endif |
fa9a63c5 RM |
3299 | |
3300 | /* Assume that each path through the pattern can be null until | |
25fe55af | 3301 | proven otherwise. We set this false at the bottom of switch |
fa9a63c5 RM |
3302 | statement, to which we get only if a particular path doesn't |
3303 | match the empty string. */ | |
3304 | boolean path_can_be_null = true; | |
3305 | ||
b18215fc | 3306 | /* If all elements for base leading-codes in fastmap is set, this |
25fe55af | 3307 | flag is set true. */ |
b18215fc RS |
3308 | boolean match_any_multibyte_characters = false; |
3309 | ||
f6a3f532 | 3310 | assert (p); |
5e69f11e | 3311 | |
fa9a63c5 | 3312 | INIT_FAIL_STACK (); |
5e69f11e | 3313 | |
505bde11 SM |
3314 | /* The loop below works as follows: |
3315 | - It has a working-list kept in the PATTERN_STACK and which basically | |
3316 | starts by only containing a pointer to the first operation. | |
3317 | - If the opcode we're looking at is a match against some set of | |
3318 | chars, then we add those chars to the fastmap and go on to the | |
3319 | next work element from the worklist (done via `break'). | |
3320 | - If the opcode is a control operator on the other hand, we either | |
3321 | ignore it (if it's meaningless at this point, such as `start_memory') | |
3322 | or execute it (if it's a jump). If the jump has several destinations | |
3323 | (i.e. `on_failure_jump'), then we push the other destination onto the | |
3324 | worklist. | |
3325 | We guarantee termination by ignoring backward jumps (more or less), | |
3326 | so that `p' is monotonically increasing. More to the point, we | |
3327 | never set `p' (or push) anything `<= p1'. */ | |
3328 | ||
3329 | /* If can_be_null is set, then the fastmap will not be used anyway. */ | |
f6a3f532 | 3330 | while (1) |
fa9a63c5 | 3331 | { |
505bde11 SM |
3332 | /* `p1' is used as a marker of how far back a `on_failure_jump' |
3333 | can go without being ignored. It is normally equal to `p' | |
3334 | (which prevents any backward `on_failure_jump') except right | |
3335 | after a plain `jump', to allow patterns such as: | |
3336 | 0: jump 10 | |
3337 | 3..9: <body> | |
3338 | 10: on_failure_jump 3 | |
3339 | as used for the *? operator. */ | |
3340 | unsigned char *p1 = p; | |
3341 | ||
f6a3f532 | 3342 | if (p >= pend) |
fa9a63c5 | 3343 | { |
f6a3f532 SM |
3344 | if (path_can_be_null) |
3345 | return (RESET_FAIL_STACK (), 1); | |
fa9a63c5 | 3346 | |
f6a3f532 SM |
3347 | /* We have reached the (effective) end of pattern. */ |
3348 | if (PATTERN_STACK_EMPTY ()) | |
3349 | return (RESET_FAIL_STACK (), 0); | |
fa9a63c5 | 3350 | |
f6a3f532 SM |
3351 | p = (unsigned char*) POP_PATTERN_OP (); |
3352 | path_can_be_null = true; | |
3353 | continue; | |
fa9a63c5 RM |
3354 | } |
3355 | ||
25fe55af | 3356 | /* We should never be about to go beyond the end of the pattern. */ |
fa9a63c5 | 3357 | assert (p < pend); |
5e69f11e | 3358 | |
fa9a63c5 RM |
3359 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++)) |
3360 | { | |
f6a3f532 SM |
3361 | case succeed: |
3362 | p = pend; | |
3363 | continue; | |
fa9a63c5 | 3364 | |
fa9a63c5 | 3365 | case duplicate: |
505bde11 SM |
3366 | /* If the first character has to match a backreference, that means |
3367 | that the group was empty (since it already matched). Since this | |
3368 | is the only case that interests us here, we can assume that the | |
3369 | backreference must match the empty string. */ | |
3370 | p++; | |
3371 | continue; | |
fa9a63c5 RM |
3372 | |
3373 | ||
3374 | /* Following are the cases which match a character. These end | |
25fe55af | 3375 | with `break'. */ |
fa9a63c5 RM |
3376 | |
3377 | case exactn: | |
f6a3f532 | 3378 | if (fastmap) fastmap[p[1]] = 1; |
fa9a63c5 RM |
3379 | break; |
3380 | ||
3381 | ||
1fb352e0 SM |
3382 | case anychar: |
3383 | /* We could put all the chars except for \n (and maybe \0) | |
3384 | but we don't bother since it is generally not worth it. */ | |
f6a3f532 SM |
3385 | if (!fastmap) break; |
3386 | return (RESET_FAIL_STACK (), -1); | |
fa9a63c5 RM |
3387 | |
3388 | ||
b18215fc | 3389 | case charset_not: |
ba5c004d RS |
3390 | /* Chars beyond end of bitmap are possible matches. |
3391 | All the single-byte codes can occur in multibyte buffers. | |
3392 | So any that are not listed in the charset | |
3393 | are possible matches, even in multibyte buffers. */ | |
1fb352e0 | 3394 | if (!fastmap) break; |
b18215fc | 3395 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH; |
1fb352e0 | 3396 | j < (1 << BYTEWIDTH); j++) |
b18215fc | 3397 | fastmap[j] = 1; |
1fb352e0 SM |
3398 | /* Fallthrough */ |
3399 | case charset: | |
3400 | if (!fastmap) break; | |
3401 | not = (re_opcode_t) *(p - 1) == charset_not; | |
b18215fc RS |
3402 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH - 1, p++; |
3403 | j >= 0; j--) | |
1fb352e0 | 3404 | if (!!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))) ^ not) |
b18215fc RS |
3405 | fastmap[j] = 1; |
3406 | ||
1fb352e0 SM |
3407 | if ((not && multibyte) |
3408 | /* Any character set can possibly contain a character | |
3409 | which doesn't match the specified set of characters. */ | |
3410 | || (CHARSET_RANGE_TABLE_EXISTS_P (&p[-2]) | |
3411 | && CHARSET_RANGE_TABLE_BITS (&p[-2]) != 0)) | |
3412 | /* If we can match a character class, we can match | |
3413 | any character set. */ | |
b18215fc RS |
3414 | { |
3415 | set_fastmap_for_multibyte_characters: | |
3416 | if (match_any_multibyte_characters == false) | |
3417 | { | |
3418 | for (j = 0x80; j < 0xA0; j++) /* XXX */ | |
3419 | if (BASE_LEADING_CODE_P (j)) | |
3420 | fastmap[j] = 1; | |
3421 | match_any_multibyte_characters = true; | |
3422 | } | |
3423 | } | |
b18215fc | 3424 | |
1fb352e0 SM |
3425 | else if (!not && CHARSET_RANGE_TABLE_EXISTS_P (&p[-2]) |
3426 | && match_any_multibyte_characters == false) | |
3427 | { | |
3428 | /* Set fastmap[I] 1 where I is a base leading code of each | |
3429 | multibyte character in the range table. */ | |
3430 | int c, count; | |
b18215fc | 3431 | |
1fb352e0 SM |
3432 | /* Make P points the range table. `+ 2' is to skip flag |
3433 | bits for a character class. */ | |
3434 | p += CHARSET_BITMAP_SIZE (&p[-2]) + 2; | |
b18215fc | 3435 | |
1fb352e0 SM |
3436 | /* Extract the number of ranges in range table into COUNT. */ |
3437 | EXTRACT_NUMBER_AND_INCR (count, p); | |
3438 | for (; count > 0; count--, p += 2 * 3) /* XXX */ | |
3439 | { | |
3440 | /* Extract the start of each range. */ | |
3441 | EXTRACT_CHARACTER (c, p); | |
3442 | j = CHAR_CHARSET (c); | |
3443 | fastmap[CHARSET_LEADING_CODE_BASE (j)] = 1; | |
3444 | } | |
3445 | } | |
b18215fc RS |
3446 | break; |
3447 | ||
1fb352e0 SM |
3448 | case syntaxspec: |
3449 | case notsyntaxspec: | |
3450 | if (!fastmap) break; | |
3451 | #ifndef emacs | |
3452 | not = (re_opcode_t)p[-1] == notsyntaxspec; | |
3453 | k = *p++; | |
3454 | for (j = 0; j < (1 << BYTEWIDTH); j++) | |
990b2375 | 3455 | if ((SYNTAX (j) == (enum syntaxcode) k) ^ not) |
b18215fc | 3456 | fastmap[j] = 1; |
b18215fc | 3457 | break; |
1fb352e0 | 3458 | #else /* emacs */ |
b18215fc RS |
3459 | /* This match depends on text properties. These end with |
3460 | aborting optimizations. */ | |
f6a3f532 | 3461 | return (RESET_FAIL_STACK (), -1); |
b18215fc RS |
3462 | |
3463 | case categoryspec: | |
b18215fc | 3464 | case notcategoryspec: |
1fb352e0 SM |
3465 | if (!fastmap) break; |
3466 | not = (re_opcode_t)p[-1] == notcategoryspec; | |
b18215fc | 3467 | k = *p++; |
1fb352e0 SM |
3468 | for (j = 0; j < (1 << BYTEWIDTH); j++) |
3469 | if ((CHAR_HAS_CATEGORY (j, k)) ^ not) | |
b18215fc RS |
3470 | fastmap[j] = 1; |
3471 | ||
1fb352e0 | 3472 | if (multibyte) |
b18215fc | 3473 | /* Any character set can possibly contain a character |
1fb352e0 | 3474 | whose category is K (or not). */ |
b18215fc RS |
3475 | goto set_fastmap_for_multibyte_characters; |
3476 | break; | |
3477 | ||
fa9a63c5 | 3478 | /* All cases after this match the empty string. These end with |
25fe55af | 3479 | `continue'. */ |
fa9a63c5 | 3480 | |
fa9a63c5 RM |
3481 | case before_dot: |
3482 | case at_dot: | |
3483 | case after_dot: | |
1fb352e0 | 3484 | #endif /* !emacs */ |
25fe55af RS |
3485 | case no_op: |
3486 | case begline: | |
3487 | case endline: | |
fa9a63c5 RM |
3488 | case begbuf: |
3489 | case endbuf: | |
3490 | case wordbound: | |
3491 | case notwordbound: | |
3492 | case wordbeg: | |
3493 | case wordend: | |
25fe55af | 3494 | continue; |
fa9a63c5 RM |
3495 | |
3496 | ||
fa9a63c5 | 3497 | case jump: |
25fe55af | 3498 | EXTRACT_NUMBER_AND_INCR (j, p); |
505bde11 SM |
3499 | if (j < 0) |
3500 | /* Backward jumps can only go back to code that we've already | |
3501 | visited. `re_compile' should make sure this is true. */ | |
3502 | break; | |
25fe55af | 3503 | p += j; |
505bde11 SM |
3504 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p)) |
3505 | { | |
3506 | case on_failure_jump: | |
3507 | case on_failure_keep_string_jump: | |
505bde11 | 3508 | case on_failure_jump_loop: |
0683b6fa | 3509 | case on_failure_jump_nastyloop: |
505bde11 SM |
3510 | case on_failure_jump_smart: |
3511 | p++; | |
3512 | break; | |
3513 | default: | |
3514 | continue; | |
3515 | }; | |
3516 | /* Keep `p1' to allow the `on_failure_jump' we are jumping to | |
3517 | to jump back to "just after here". */ | |
3518 | /* Fallthrough */ | |
fa9a63c5 | 3519 | |
25fe55af RS |
3520 | case on_failure_jump: |
3521 | case on_failure_keep_string_jump: | |
0683b6fa | 3522 | case on_failure_jump_nastyloop: |
505bde11 SM |
3523 | case on_failure_jump_loop: |
3524 | case on_failure_jump_smart: | |
25fe55af | 3525 | EXTRACT_NUMBER_AND_INCR (j, p); |
505bde11 | 3526 | if (p + j <= p1) |
ed0767d8 SM |
3527 | ; /* Backward jump to be ignored. */ |
3528 | else if (!PUSH_PATTERN_OP (p + j, fail_stack)) | |
3529 | return (RESET_FAIL_STACK (), -2); | |
25fe55af | 3530 | continue; |
fa9a63c5 RM |
3531 | |
3532 | ||
ed0767d8 SM |
3533 | case jump_n: |
3534 | /* This code simply does not properly handle forward jump_n. */ | |
3535 | DEBUG_STATEMENT (EXTRACT_NUMBER (j, p); assert (j < 0)); | |
3536 | p += 4; | |
3537 | /* jump_n can either jump or fall through. The (backward) jump | |
3538 | case has already been handled, so we only need to look at the | |
3539 | fallthrough case. */ | |
3540 | continue; | |
3541 | ||
fa9a63c5 | 3542 | case succeed_n: |
ed0767d8 SM |
3543 | /* If N == 0, it should be an on_failure_jump_loop instead. */ |
3544 | DEBUG_STATEMENT (EXTRACT_NUMBER (j, p + 2); assert (j > 0)); | |
3545 | p += 4; | |
3546 | /* We only care about one iteration of the loop, so we don't | |
3547 | need to consider the case where this behaves like an | |
3548 | on_failure_jump. */ | |
25fe55af | 3549 | continue; |
fa9a63c5 RM |
3550 | |
3551 | ||
3552 | case set_number_at: | |
25fe55af RS |
3553 | p += 4; |
3554 | continue; | |
fa9a63c5 RM |
3555 | |
3556 | ||
3557 | case start_memory: | |
25fe55af | 3558 | case stop_memory: |
505bde11 | 3559 | p += 1; |
fa9a63c5 RM |
3560 | continue; |
3561 | ||
3562 | ||
3563 | default: | |
25fe55af RS |
3564 | abort (); /* We have listed all the cases. */ |
3565 | } /* switch *p++ */ | |
fa9a63c5 RM |
3566 | |
3567 | /* Getting here means we have found the possible starting | |
25fe55af RS |
3568 | characters for one path of the pattern -- and that the empty |
3569 | string does not match. We need not follow this path further. | |
3570 | Instead, look at the next alternative (remembered on the | |
3571 | stack), or quit if no more. The test at the top of the loop | |
3572 | does these things. */ | |
fa9a63c5 RM |
3573 | path_can_be_null = false; |
3574 | p = pend; | |
3575 | } /* while p */ | |
3576 | ||
f6a3f532 SM |
3577 | return (RESET_FAIL_STACK (), 0); |
3578 | } /* analyse_first */ | |
3579 | \f | |
3580 | /* re_compile_fastmap computes a ``fastmap'' for the compiled pattern in | |
3581 | BUFP. A fastmap records which of the (1 << BYTEWIDTH) possible | |
3582 | characters can start a string that matches the pattern. This fastmap | |
3583 | is used by re_search to skip quickly over impossible starting points. | |
3584 | ||
3585 | Character codes above (1 << BYTEWIDTH) are not represented in the | |
3586 | fastmap, but the leading codes are represented. Thus, the fastmap | |
3587 | indicates which character sets could start a match. | |
3588 | ||
3589 | The caller must supply the address of a (1 << BYTEWIDTH)-byte data | |
3590 | area as BUFP->fastmap. | |
3591 | ||
3592 | We set the `fastmap', `fastmap_accurate', and `can_be_null' fields in | |
3593 | the pattern buffer. | |
3594 | ||
3595 | Returns 0 if we succeed, -2 if an internal error. */ | |
3596 | ||
3597 | int | |
3598 | re_compile_fastmap (bufp) | |
3599 | struct re_pattern_buffer *bufp; | |
3600 | { | |
3601 | char *fastmap = bufp->fastmap; | |
3602 | int analysis; | |
3603 | ||
3604 | assert (fastmap && bufp->buffer); | |
3605 | ||
3606 | bzero (fastmap, 1 << BYTEWIDTH); /* Assume nothing's valid. */ | |
3607 | bufp->fastmap_accurate = 1; /* It will be when we're done. */ | |
3608 | ||
3609 | analysis = analyse_first (bufp->buffer, bufp->buffer + bufp->used, | |
2d1675e4 | 3610 | fastmap, RE_MULTIBYTE_P (bufp)); |
f6a3f532 SM |
3611 | if (analysis < -1) |
3612 | return analysis; | |
3613 | bufp->can_be_null = (analysis != 0); | |
fa9a63c5 RM |
3614 | return 0; |
3615 | } /* re_compile_fastmap */ | |
3616 | \f | |
3617 | /* Set REGS to hold NUM_REGS registers, storing them in STARTS and | |
3618 | ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use | |
3619 | this memory for recording register information. STARTS and ENDS | |
3620 | must be allocated using the malloc library routine, and must each | |
3621 | be at least NUM_REGS * sizeof (regoff_t) bytes long. | |
3622 | ||
3623 | If NUM_REGS == 0, then subsequent matches should allocate their own | |
3624 | register data. | |
3625 | ||
3626 | Unless this function is called, the first search or match using | |
3627 | PATTERN_BUFFER will allocate its own register data, without | |
3628 | freeing the old data. */ | |
3629 | ||
3630 | void | |
3631 | re_set_registers (bufp, regs, num_regs, starts, ends) | |
3632 | struct re_pattern_buffer *bufp; | |
3633 | struct re_registers *regs; | |
3634 | unsigned num_regs; | |
3635 | regoff_t *starts, *ends; | |
3636 | { | |
3637 | if (num_regs) | |
3638 | { | |
3639 | bufp->regs_allocated = REGS_REALLOCATE; | |
3640 | regs->num_regs = num_regs; | |
3641 | regs->start = starts; | |
3642 | regs->end = ends; | |
3643 | } | |
3644 | else | |
3645 | { | |
3646 | bufp->regs_allocated = REGS_UNALLOCATED; | |
3647 | regs->num_regs = 0; | |
3648 | regs->start = regs->end = (regoff_t *) 0; | |
3649 | } | |
3650 | } | |
3651 | \f | |
25fe55af | 3652 | /* Searching routines. */ |
fa9a63c5 RM |
3653 | |
3654 | /* Like re_search_2, below, but only one string is specified, and | |
3655 | doesn't let you say where to stop matching. */ | |
3656 | ||
3657 | int | |
3658 | re_search (bufp, string, size, startpos, range, regs) | |
3659 | struct re_pattern_buffer *bufp; | |
3660 | const char *string; | |
3661 | int size, startpos, range; | |
3662 | struct re_registers *regs; | |
3663 | { | |
5e69f11e | 3664 | return re_search_2 (bufp, NULL, 0, string, size, startpos, range, |
fa9a63c5 RM |
3665 | regs, size); |
3666 | } | |
3667 | ||
b18215fc RS |
3668 | /* End address of virtual concatenation of string. */ |
3669 | #define STOP_ADDR_VSTRING(P) \ | |
3670 | (((P) >= size1 ? string2 + size2 : string1 + size1)) | |
3671 | ||
3672 | /* Address of POS in the concatenation of virtual string. */ | |
3673 | #define POS_ADDR_VSTRING(POS) \ | |
3674 | (((POS) >= size1 ? string2 - size1 : string1) + (POS)) | |
fa9a63c5 RM |
3675 | |
3676 | /* Using the compiled pattern in BUFP->buffer, first tries to match the | |
3677 | virtual concatenation of STRING1 and STRING2, starting first at index | |
3678 | STARTPOS, then at STARTPOS + 1, and so on. | |
5e69f11e | 3679 | |
fa9a63c5 | 3680 | STRING1 and STRING2 have length SIZE1 and SIZE2, respectively. |
5e69f11e | 3681 | |
fa9a63c5 RM |
3682 | RANGE is how far to scan while trying to match. RANGE = 0 means try |
3683 | only at STARTPOS; in general, the last start tried is STARTPOS + | |
3684 | RANGE. | |
5e69f11e | 3685 | |
fa9a63c5 RM |
3686 | In REGS, return the indices of the virtual concatenation of STRING1 |
3687 | and STRING2 that matched the entire BUFP->buffer and its contained | |
3688 | subexpressions. | |
5e69f11e | 3689 | |
fa9a63c5 RM |
3690 | Do not consider matching one past the index STOP in the virtual |
3691 | concatenation of STRING1 and STRING2. | |
3692 | ||
3693 | We return either the position in the strings at which the match was | |
3694 | found, -1 if no match, or -2 if error (such as failure | |
3695 | stack overflow). */ | |
3696 | ||
3697 | int | |
66f0296e | 3698 | re_search_2 (bufp, str1, size1, str2, size2, startpos, range, regs, stop) |
fa9a63c5 | 3699 | struct re_pattern_buffer *bufp; |
66f0296e | 3700 | const char *str1, *str2; |
fa9a63c5 RM |
3701 | int size1, size2; |
3702 | int startpos; | |
3703 | int range; | |
3704 | struct re_registers *regs; | |
3705 | int stop; | |
3706 | { | |
3707 | int val; | |
66f0296e SM |
3708 | re_char *string1 = (re_char*) str1; |
3709 | re_char *string2 = (re_char*) str2; | |
fa9a63c5 | 3710 | register char *fastmap = bufp->fastmap; |
6676cb1c | 3711 | register RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 RM |
3712 | int total_size = size1 + size2; |
3713 | int endpos = startpos + range; | |
c8499ba5 | 3714 | int anchored_start = 0; |
fa9a63c5 | 3715 | |
25fe55af | 3716 | /* Nonzero if we have to concern multibyte character. */ |
2d1675e4 | 3717 | const boolean multibyte = RE_MULTIBYTE_P (bufp); |
b18215fc | 3718 | |
fa9a63c5 RM |
3719 | /* Check for out-of-range STARTPOS. */ |
3720 | if (startpos < 0 || startpos > total_size) | |
3721 | return -1; | |
5e69f11e | 3722 | |
fa9a63c5 | 3723 | /* Fix up RANGE if it might eventually take us outside |
34597fa9 | 3724 | the virtual concatenation of STRING1 and STRING2. |
5e69f11e | 3725 | Make sure we won't move STARTPOS below 0 or above TOTAL_SIZE. */ |
34597fa9 RS |
3726 | if (endpos < 0) |
3727 | range = 0 - startpos; | |
fa9a63c5 RM |
3728 | else if (endpos > total_size) |
3729 | range = total_size - startpos; | |
3730 | ||
3731 | /* If the search isn't to be a backwards one, don't waste time in a | |
7b140fd7 | 3732 | search for a pattern anchored at beginning of buffer. */ |
fa9a63c5 RM |
3733 | if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == begbuf && range > 0) |
3734 | { | |
3735 | if (startpos > 0) | |
3736 | return -1; | |
3737 | else | |
7b140fd7 | 3738 | range = 0; |
fa9a63c5 RM |
3739 | } |
3740 | ||
ae4788a8 RS |
3741 | #ifdef emacs |
3742 | /* In a forward search for something that starts with \=. | |
3743 | don't keep searching past point. */ | |
3744 | if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == at_dot && range > 0) | |
3745 | { | |
7b140fd7 RS |
3746 | range = PT_BYTE - BEGV_BYTE - startpos; |
3747 | if (range < 0) | |
ae4788a8 RS |
3748 | return -1; |
3749 | } | |
3750 | #endif /* emacs */ | |
3751 | ||
fa9a63c5 RM |
3752 | /* Update the fastmap now if not correct already. */ |
3753 | if (fastmap && !bufp->fastmap_accurate) | |
3754 | if (re_compile_fastmap (bufp) == -2) | |
3755 | return -2; | |
5e69f11e | 3756 | |
c8499ba5 RS |
3757 | /* See whether the pattern is anchored. */ |
3758 | if (bufp->buffer[0] == begline) | |
3759 | anchored_start = 1; | |
3760 | ||
b18215fc | 3761 | #ifdef emacs |
cc9b4df2 KH |
3762 | gl_state.object = re_match_object; |
3763 | { | |
99633e97 | 3764 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (POS_AS_IN_BUFFER (startpos)); |
cc9b4df2 KH |
3765 | |
3766 | SETUP_SYNTAX_TABLE_FOR_OBJECT (re_match_object, charpos, 1); | |
3767 | } | |
b18215fc RS |
3768 | #endif |
3769 | ||
fa9a63c5 RM |
3770 | /* Loop through the string, looking for a place to start matching. */ |
3771 | for (;;) | |
5e69f11e | 3772 | { |
c8499ba5 RS |
3773 | /* If the pattern is anchored, |
3774 | skip quickly past places we cannot match. | |
3775 | We don't bother to treat startpos == 0 specially | |
3776 | because that case doesn't repeat. */ | |
3777 | if (anchored_start && startpos > 0) | |
3778 | { | |
3779 | if (! (bufp->newline_anchor | |
3780 | && ((startpos <= size1 ? string1[startpos - 1] | |
3781 | : string2[startpos - size1 - 1]) | |
3782 | == '\n'))) | |
3783 | goto advance; | |
3784 | } | |
3785 | ||
fa9a63c5 | 3786 | /* If a fastmap is supplied, skip quickly over characters that |
25fe55af RS |
3787 | cannot be the start of a match. If the pattern can match the |
3788 | null string, however, we don't need to skip characters; we want | |
3789 | the first null string. */ | |
fa9a63c5 RM |
3790 | if (fastmap && startpos < total_size && !bufp->can_be_null) |
3791 | { | |
66f0296e | 3792 | register re_char *d; |
e934739e RS |
3793 | register unsigned int buf_ch; |
3794 | ||
3795 | d = POS_ADDR_VSTRING (startpos); | |
3796 | ||
25fe55af | 3797 | if (range > 0) /* Searching forwards. */ |
fa9a63c5 | 3798 | { |
fa9a63c5 RM |
3799 | register int lim = 0; |
3800 | int irange = range; | |
3801 | ||
25fe55af RS |
3802 | if (startpos < size1 && startpos + range >= size1) |
3803 | lim = range - (size1 - startpos); | |
fa9a63c5 | 3804 | |
25fe55af RS |
3805 | /* Written out as an if-else to avoid testing `translate' |
3806 | inside the loop. */ | |
28ae27ae AS |
3807 | if (RE_TRANSLATE_P (translate)) |
3808 | { | |
e934739e RS |
3809 | if (multibyte) |
3810 | while (range > lim) | |
3811 | { | |
3812 | int buf_charlen; | |
3813 | ||
3814 | buf_ch = STRING_CHAR_AND_LENGTH (d, range - lim, | |
3815 | buf_charlen); | |
3816 | ||
3817 | buf_ch = RE_TRANSLATE (translate, buf_ch); | |
3818 | if (buf_ch >= 0400 | |
3819 | || fastmap[buf_ch]) | |
3820 | break; | |
3821 | ||
3822 | range -= buf_charlen; | |
3823 | d += buf_charlen; | |
3824 | } | |
3825 | else | |
3826 | while (range > lim | |
66f0296e | 3827 | && !fastmap[RE_TRANSLATE (translate, *d)]) |
33c46939 RS |
3828 | { |
3829 | d++; | |
3830 | range--; | |
3831 | } | |
e934739e | 3832 | } |
fa9a63c5 | 3833 | else |
66f0296e | 3834 | while (range > lim && !fastmap[*d]) |
33c46939 RS |
3835 | { |
3836 | d++; | |
3837 | range--; | |
3838 | } | |
fa9a63c5 RM |
3839 | |
3840 | startpos += irange - range; | |
3841 | } | |
25fe55af | 3842 | else /* Searching backwards. */ |
fa9a63c5 | 3843 | { |
2d1675e4 SM |
3844 | int room = (startpos >= size1 |
3845 | ? size2 + size1 - startpos | |
3846 | : size1 - startpos); | |
3847 | buf_ch = RE_STRING_CHAR (d, room); | |
3848 | buf_ch = TRANSLATE (buf_ch); | |
fa9a63c5 | 3849 | |
e934739e RS |
3850 | if (! (buf_ch >= 0400 |
3851 | || fastmap[buf_ch])) | |
fa9a63c5 RM |
3852 | goto advance; |
3853 | } | |
3854 | } | |
3855 | ||
3856 | /* If can't match the null string, and that's all we have left, fail. */ | |
3857 | if (range >= 0 && startpos == total_size && fastmap | |
25fe55af | 3858 | && !bufp->can_be_null) |
fa9a63c5 RM |
3859 | return -1; |
3860 | ||
3861 | val = re_match_2_internal (bufp, string1, size1, string2, size2, | |
3862 | startpos, regs, stop); | |
3863 | #ifndef REGEX_MALLOC | |
3864 | #ifdef C_ALLOCA | |
3865 | alloca (0); | |
3866 | #endif | |
3867 | #endif | |
3868 | ||
3869 | if (val >= 0) | |
3870 | return startpos; | |
5e69f11e | 3871 | |
fa9a63c5 RM |
3872 | if (val == -2) |
3873 | return -2; | |
3874 | ||
3875 | advance: | |
5e69f11e | 3876 | if (!range) |
25fe55af | 3877 | break; |
5e69f11e | 3878 | else if (range > 0) |
25fe55af | 3879 | { |
b18215fc RS |
3880 | /* Update STARTPOS to the next character boundary. */ |
3881 | if (multibyte) | |
3882 | { | |
66f0296e SM |
3883 | re_char *p = POS_ADDR_VSTRING (startpos); |
3884 | re_char *pend = STOP_ADDR_VSTRING (startpos); | |
b18215fc RS |
3885 | int len = MULTIBYTE_FORM_LENGTH (p, pend - p); |
3886 | ||
3887 | range -= len; | |
3888 | if (range < 0) | |
3889 | break; | |
3890 | startpos += len; | |
3891 | } | |
3892 | else | |
3893 | { | |
b560c397 RS |
3894 | range--; |
3895 | startpos++; | |
3896 | } | |
e318085a | 3897 | } |
fa9a63c5 | 3898 | else |
25fe55af RS |
3899 | { |
3900 | range++; | |
3901 | startpos--; | |
b18215fc RS |
3902 | |
3903 | /* Update STARTPOS to the previous character boundary. */ | |
3904 | if (multibyte) | |
3905 | { | |
66f0296e | 3906 | re_char *p = POS_ADDR_VSTRING (startpos); |
b18215fc RS |
3907 | int len = 0; |
3908 | ||
3909 | /* Find the head of multibyte form. */ | |
5d967c7a | 3910 | while (!CHAR_HEAD_P (*p)) |
b18215fc RS |
3911 | p--, len++; |
3912 | ||
3913 | /* Adjust it. */ | |
3914 | #if 0 /* XXX */ | |
3915 | if (MULTIBYTE_FORM_LENGTH (p, len + 1) != (len + 1)) | |
3916 | ; | |
3917 | else | |
3918 | #endif | |
3919 | { | |
3920 | range += len; | |
3921 | if (range > 0) | |
3922 | break; | |
3923 | ||
3924 | startpos -= len; | |
3925 | } | |
3926 | } | |
25fe55af | 3927 | } |
fa9a63c5 RM |
3928 | } |
3929 | return -1; | |
3930 | } /* re_search_2 */ | |
3931 | \f | |
3932 | /* Declarations and macros for re_match_2. */ | |
3933 | ||
2d1675e4 SM |
3934 | static int bcmp_translate _RE_ARGS((re_char *s1, re_char *s2, |
3935 | register int len, | |
3936 | RE_TRANSLATE_TYPE translate, | |
3937 | const int multibyte)); | |
fa9a63c5 RM |
3938 | |
3939 | /* This converts PTR, a pointer into one of the search strings `string1' | |
3940 | and `string2' into an offset from the beginning of that string. */ | |
3941 | #define POINTER_TO_OFFSET(ptr) \ | |
3942 | (FIRST_STRING_P (ptr) \ | |
3943 | ? ((regoff_t) ((ptr) - string1)) \ | |
3944 | : ((regoff_t) ((ptr) - string2 + size1))) | |
3945 | ||
fa9a63c5 | 3946 | /* Call before fetching a character with *d. This switches over to |
419d1c74 SM |
3947 | string2 if necessary. |
3948 | Check re_match_2_internal for a discussion of why end_match_2 might | |
3949 | not be within string2 (but be equal to end_match_1 instead). */ | |
fa9a63c5 | 3950 | #define PREFETCH() \ |
25fe55af | 3951 | while (d == dend) \ |
fa9a63c5 RM |
3952 | { \ |
3953 | /* End of string2 => fail. */ \ | |
25fe55af RS |
3954 | if (dend == end_match_2) \ |
3955 | goto fail; \ | |
3956 | /* End of string1 => advance to string2. */ \ | |
3957 | d = string2; \ | |
fa9a63c5 RM |
3958 | dend = end_match_2; \ |
3959 | } | |
3960 | ||
f1ad044f SM |
3961 | /* Call before fetching a char with *d if you already checked other limits. |
3962 | This is meant for use in lookahead operations like wordend, etc.. | |
3963 | where we might need to look at parts of the string that might be | |
3964 | outside of the LIMITs (i.e past `stop'). */ | |
3965 | #define PREFETCH_NOLIMIT() \ | |
3966 | if (d == end1) \ | |
3967 | { \ | |
3968 | d = string2; \ | |
3969 | dend = end_match_2; \ | |
3970 | } \ | |
fa9a63c5 RM |
3971 | |
3972 | /* Test if at very beginning or at very end of the virtual concatenation | |
25fe55af | 3973 | of `string1' and `string2'. If only one string, it's `string2'. */ |
fa9a63c5 | 3974 | #define AT_STRINGS_BEG(d) ((d) == (size1 ? string1 : string2) || !size2) |
5e69f11e | 3975 | #define AT_STRINGS_END(d) ((d) == end2) |
fa9a63c5 RM |
3976 | |
3977 | ||
3978 | /* Test if D points to a character which is word-constituent. We have | |
3979 | two special cases to check for: if past the end of string1, look at | |
3980 | the first character in string2; and if before the beginning of | |
3981 | string2, look at the last character in string1. */ | |
3982 | #define WORDCHAR_P(d) \ | |
3983 | (SYNTAX ((d) == end1 ? *string2 \ | |
25fe55af | 3984 | : (d) == string2 - 1 ? *(end1 - 1) : *(d)) \ |
fa9a63c5 RM |
3985 | == Sword) |
3986 | ||
9121ca40 | 3987 | /* Disabled due to a compiler bug -- see comment at case wordbound */ |
b18215fc RS |
3988 | |
3989 | /* The comment at case wordbound is following one, but we don't use | |
3990 | AT_WORD_BOUNDARY anymore to support multibyte form. | |
3991 | ||
3992 | The DEC Alpha C compiler 3.x generates incorrect code for the | |
25fe55af RS |
3993 | test WORDCHAR_P (d - 1) != WORDCHAR_P (d) in the expansion of |
3994 | AT_WORD_BOUNDARY, so this code is disabled. Expanding the | |
b18215fc RS |
3995 | macro and introducing temporary variables works around the bug. */ |
3996 | ||
9121ca40 | 3997 | #if 0 |
fa9a63c5 RM |
3998 | /* Test if the character before D and the one at D differ with respect |
3999 | to being word-constituent. */ | |
4000 | #define AT_WORD_BOUNDARY(d) \ | |
4001 | (AT_STRINGS_BEG (d) || AT_STRINGS_END (d) \ | |
4002 | || WORDCHAR_P (d - 1) != WORDCHAR_P (d)) | |
9121ca40 | 4003 | #endif |
fa9a63c5 RM |
4004 | |
4005 | /* Free everything we malloc. */ | |
4006 | #ifdef MATCH_MAY_ALLOCATE | |
00049484 | 4007 | #define FREE_VAR(var) if (var) { REGEX_FREE (var); var = NULL; } else |
fa9a63c5 RM |
4008 | #define FREE_VARIABLES() \ |
4009 | do { \ | |
4010 | REGEX_FREE_STACK (fail_stack.stack); \ | |
4011 | FREE_VAR (regstart); \ | |
4012 | FREE_VAR (regend); \ | |
fa9a63c5 RM |
4013 | FREE_VAR (best_regstart); \ |
4014 | FREE_VAR (best_regend); \ | |
fa9a63c5 RM |
4015 | } while (0) |
4016 | #else | |
4017 | #define FREE_VARIABLES() ((void)0) /* Do nothing! But inhibit gcc warning. */ | |
4018 | #endif /* not MATCH_MAY_ALLOCATE */ | |
4019 | ||
505bde11 SM |
4020 | \f |
4021 | /* Optimization routines. */ | |
4022 | ||
4e8a9132 SM |
4023 | /* If the operation is a match against one or more chars, |
4024 | return a pointer to the next operation, else return NULL. */ | |
4025 | static unsigned char * | |
4026 | skip_one_char (p) | |
4027 | unsigned char *p; | |
4028 | { | |
4029 | switch (SWITCH_ENUM_CAST (*p++)) | |
4030 | { | |
4031 | case anychar: | |
4032 | break; | |
4033 | ||
4034 | case exactn: | |
4035 | p += *p + 1; | |
4036 | break; | |
4037 | ||
4038 | case charset_not: | |
4039 | case charset: | |
4040 | if (CHARSET_RANGE_TABLE_EXISTS_P (p - 1)) | |
4041 | { | |
4042 | int mcnt; | |
4043 | p = CHARSET_RANGE_TABLE (p - 1); | |
4044 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
4045 | p = CHARSET_RANGE_TABLE_END (p, mcnt); | |
4046 | } | |
4047 | else | |
4048 | p += 1 + CHARSET_BITMAP_SIZE (p - 1); | |
4049 | break; | |
4050 | ||
4e8a9132 SM |
4051 | case syntaxspec: |
4052 | case notsyntaxspec: | |
1fb352e0 | 4053 | #ifdef emacs |
4e8a9132 SM |
4054 | case categoryspec: |
4055 | case notcategoryspec: | |
4056 | #endif /* emacs */ | |
4057 | p++; | |
4058 | break; | |
4059 | ||
4060 | default: | |
4061 | p = NULL; | |
4062 | } | |
4063 | return p; | |
4064 | } | |
4065 | ||
4066 | ||
505bde11 SM |
4067 | /* Jump over non-matching operations. */ |
4068 | static unsigned char * | |
4e8a9132 | 4069 | skip_noops (p, pend) |
505bde11 | 4070 | unsigned char *p, *pend; |
505bde11 SM |
4071 | { |
4072 | int mcnt; | |
4073 | while (p < pend) | |
4074 | { | |
4075 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p)) | |
4076 | { | |
4077 | case start_memory: | |
505bde11 SM |
4078 | case stop_memory: |
4079 | p += 2; break; | |
4080 | case no_op: | |
4081 | p += 1; break; | |
4082 | case jump: | |
4083 | p += 1; | |
4084 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
4085 | p += mcnt; | |
4086 | break; | |
4087 | default: | |
4088 | return p; | |
4089 | } | |
4090 | } | |
4091 | assert (p == pend); | |
4092 | return p; | |
4093 | } | |
4094 | ||
4095 | /* Non-zero if "p1 matches something" implies "p2 fails". */ | |
4096 | static int | |
4097 | mutually_exclusive_p (bufp, p1, p2) | |
4098 | struct re_pattern_buffer *bufp; | |
4099 | unsigned char *p1, *p2; | |
4100 | { | |
4e8a9132 | 4101 | re_opcode_t op2; |
2d1675e4 | 4102 | const boolean multibyte = RE_MULTIBYTE_P (bufp); |
505bde11 SM |
4103 | unsigned char *pend = bufp->buffer + bufp->used; |
4104 | ||
4e8a9132 | 4105 | assert (p1 >= bufp->buffer && p1 < pend |
505bde11 SM |
4106 | && p2 >= bufp->buffer && p2 <= pend); |
4107 | ||
4108 | /* Skip over open/close-group commands. | |
4109 | If what follows this loop is a ...+ construct, | |
4110 | look at what begins its body, since we will have to | |
4111 | match at least one of that. */ | |
4e8a9132 SM |
4112 | p2 = skip_noops (p2, pend); |
4113 | /* The same skip can be done for p1, except that this function | |
4114 | is only used in the case where p1 is a simple match operator. */ | |
4115 | /* p1 = skip_noops (p1, pend); */ | |
4116 | ||
4117 | assert (p1 >= bufp->buffer && p1 < pend | |
4118 | && p2 >= bufp->buffer && p2 <= pend); | |
4119 | ||
4120 | op2 = p2 == pend ? succeed : *p2; | |
4121 | ||
4122 | switch (SWITCH_ENUM_CAST (op2)) | |
505bde11 | 4123 | { |
4e8a9132 SM |
4124 | case succeed: |
4125 | case endbuf: | |
4126 | /* If we're at the end of the pattern, we can change. */ | |
4127 | if (skip_one_char (p1)) | |
505bde11 | 4128 | { |
505bde11 SM |
4129 | DEBUG_PRINT1 (" End of pattern: fast loop.\n"); |
4130 | return 1; | |
505bde11 | 4131 | } |
4e8a9132 SM |
4132 | break; |
4133 | ||
4134 | case endline: | |
4135 | if (!bufp->newline_anchor) | |
4136 | break; | |
4137 | /* Fallthrough */ | |
4138 | case exactn: | |
4139 | { | |
4140 | register unsigned int c | |
4141 | = (re_opcode_t) *p2 == endline ? '\n' | |
4142 | : RE_STRING_CHAR(p2 + 2, pend - p2 - 2); | |
505bde11 | 4143 | |
4e8a9132 SM |
4144 | if ((re_opcode_t) *p1 == exactn) |
4145 | { | |
4146 | if (c != RE_STRING_CHAR (p1 + 2, pend - p1 - 2)) | |
4147 | { | |
4148 | DEBUG_PRINT3 (" '%c' != '%c' => fast loop.\n", c, p1[2]); | |
4149 | return 1; | |
4150 | } | |
4151 | } | |
505bde11 | 4152 | |
4e8a9132 SM |
4153 | else if ((re_opcode_t) *p1 == charset |
4154 | || (re_opcode_t) *p1 == charset_not) | |
4155 | { | |
4156 | int not = (re_opcode_t) *p1 == charset_not; | |
505bde11 | 4157 | |
4e8a9132 SM |
4158 | /* Test if C is listed in charset (or charset_not) |
4159 | at `p1'. */ | |
4160 | if (SINGLE_BYTE_CHAR_P (c)) | |
4161 | { | |
4162 | if (c < CHARSET_BITMAP_SIZE (p1) * BYTEWIDTH | |
4163 | && p1[2 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH))) | |
4164 | not = !not; | |
4165 | } | |
4166 | else if (CHARSET_RANGE_TABLE_EXISTS_P (p1)) | |
4167 | CHARSET_LOOKUP_RANGE_TABLE (not, c, p1); | |
505bde11 | 4168 | |
4e8a9132 SM |
4169 | /* `not' is equal to 1 if c would match, which means |
4170 | that we can't change to pop_failure_jump. */ | |
4171 | if (!not) | |
4172 | { | |
4173 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4174 | return 1; | |
4175 | } | |
4176 | } | |
4177 | else if ((re_opcode_t) *p1 == anychar | |
4178 | && c == '\n') | |
4179 | { | |
4180 | DEBUG_PRINT1 (" . != \\n => fast loop.\n"); | |
4181 | return 1; | |
4182 | } | |
4183 | } | |
4184 | break; | |
505bde11 | 4185 | |
4e8a9132 SM |
4186 | case charset: |
4187 | case charset_not: | |
4188 | { | |
4189 | if ((re_opcode_t) *p1 == exactn) | |
4190 | /* Reuse the code above. */ | |
4191 | return mutually_exclusive_p (bufp, p2, p1); | |
505bde11 SM |
4192 | |
4193 | ||
4194 | /* It is hard to list up all the character in charset | |
4195 | P2 if it includes multibyte character. Give up in | |
4196 | such case. */ | |
4197 | else if (!multibyte || !CHARSET_RANGE_TABLE_EXISTS_P (p2)) | |
4198 | { | |
4199 | /* Now, we are sure that P2 has no range table. | |
4200 | So, for the size of bitmap in P2, `p2[1]' is | |
4201 | enough. But P1 may have range table, so the | |
4202 | size of bitmap table of P1 is extracted by | |
4203 | using macro `CHARSET_BITMAP_SIZE'. | |
4204 | ||
4205 | Since we know that all the character listed in | |
4206 | P2 is ASCII, it is enough to test only bitmap | |
4207 | table of P1. */ | |
4208 | ||
4209 | if (*p1 == *p2) | |
4210 | { | |
4211 | int idx; | |
4212 | /* We win if the charset inside the loop | |
4213 | has no overlap with the one after the loop. */ | |
4214 | for (idx = 0; | |
4215 | (idx < (int) p2[1] | |
4216 | && idx < CHARSET_BITMAP_SIZE (p1)); | |
4217 | idx++) | |
4218 | if ((p2[2 + idx] & p1[2 + idx]) != 0) | |
4219 | break; | |
4220 | ||
4221 | if (idx == p2[1] | |
4222 | || idx == CHARSET_BITMAP_SIZE (p1)) | |
4223 | { | |
4224 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4225 | return 1; | |
4226 | } | |
4227 | } | |
4228 | else if ((re_opcode_t) *p1 == charset | |
4229 | || (re_opcode_t) *p1 == charset_not) | |
4230 | { | |
4231 | int idx; | |
4232 | /* We win if the charset_not inside the loop lists | |
4233 | every character listed in the charset after. */ | |
4234 | for (idx = 0; idx < (int) p2[1]; idx++) | |
4235 | if (! (p2[2 + idx] == 0 | |
4236 | || (idx < CHARSET_BITMAP_SIZE (p1) | |
4237 | && ((p2[2 + idx] & ~ p1[2 + idx]) == 0)))) | |
4238 | break; | |
4239 | ||
4e8a9132 SM |
4240 | if (idx == p2[1]) |
4241 | { | |
4242 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4243 | return 1; | |
4244 | } | |
4245 | } | |
4246 | } | |
4247 | } | |
4248 | ||
4e8a9132 SM |
4249 | case wordend: |
4250 | case notsyntaxspec: | |
4251 | return ((re_opcode_t) *p1 == syntaxspec | |
4252 | && p1[1] == (op2 == wordend ? Sword : p2[1])); | |
4253 | ||
4254 | case wordbeg: | |
4255 | case syntaxspec: | |
4256 | return ((re_opcode_t) *p1 == notsyntaxspec | |
4257 | && p1[1] == (op2 == wordend ? Sword : p2[1])); | |
4258 | ||
4259 | case wordbound: | |
4260 | return (((re_opcode_t) *p1 == notsyntaxspec | |
4261 | || (re_opcode_t) *p1 == syntaxspec) | |
4262 | && p1[1] == Sword); | |
4263 | ||
1fb352e0 | 4264 | #ifdef emacs |
4e8a9132 SM |
4265 | case categoryspec: |
4266 | return ((re_opcode_t) *p1 == notcategoryspec && p1[1] == p2[1]); | |
4267 | case notcategoryspec: | |
4268 | return ((re_opcode_t) *p1 == categoryspec && p1[1] == p2[1]); | |
4269 | #endif /* emacs */ | |
4270 | ||
4271 | default: | |
4272 | ; | |
505bde11 SM |
4273 | } |
4274 | ||
4275 | /* Safe default. */ | |
4276 | return 0; | |
4277 | } | |
4278 | ||
fa9a63c5 RM |
4279 | \f |
4280 | /* Matching routines. */ | |
4281 | ||
25fe55af | 4282 | #ifndef emacs /* Emacs never uses this. */ |
fa9a63c5 RM |
4283 | /* re_match is like re_match_2 except it takes only a single string. */ |
4284 | ||
4285 | int | |
4286 | re_match (bufp, string, size, pos, regs) | |
4287 | struct re_pattern_buffer *bufp; | |
4288 | const char *string; | |
4289 | int size, pos; | |
4290 | struct re_registers *regs; | |
4291 | { | |
4292 | int result = re_match_2_internal (bufp, NULL, 0, string, size, | |
4293 | pos, regs, size); | |
4294 | alloca (0); | |
4295 | return result; | |
4296 | } | |
4297 | #endif /* not emacs */ | |
4298 | ||
b18215fc RS |
4299 | #ifdef emacs |
4300 | /* In Emacs, this is the string or buffer in which we | |
25fe55af | 4301 | are matching. It is used for looking up syntax properties. */ |
b18215fc RS |
4302 | Lisp_Object re_match_object; |
4303 | #endif | |
fa9a63c5 RM |
4304 | |
4305 | /* re_match_2 matches the compiled pattern in BUFP against the | |
4306 | the (virtual) concatenation of STRING1 and STRING2 (of length SIZE1 | |
4307 | and SIZE2, respectively). We start matching at POS, and stop | |
4308 | matching at STOP. | |
5e69f11e | 4309 | |
fa9a63c5 | 4310 | If REGS is non-null and the `no_sub' field of BUFP is nonzero, we |
25fe55af | 4311 | store offsets for the substring each group matched in REGS. See the |
fa9a63c5 RM |
4312 | documentation for exactly how many groups we fill. |
4313 | ||
4314 | We return -1 if no match, -2 if an internal error (such as the | |
25fe55af | 4315 | failure stack overflowing). Otherwise, we return the length of the |
fa9a63c5 RM |
4316 | matched substring. */ |
4317 | ||
4318 | int | |
4319 | re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop) | |
4320 | struct re_pattern_buffer *bufp; | |
4321 | const char *string1, *string2; | |
4322 | int size1, size2; | |
4323 | int pos; | |
4324 | struct re_registers *regs; | |
4325 | int stop; | |
4326 | { | |
b18215fc | 4327 | int result; |
25fe55af | 4328 | |
b18215fc | 4329 | #ifdef emacs |
cc9b4df2 KH |
4330 | int charpos; |
4331 | gl_state.object = re_match_object; | |
99633e97 | 4332 | charpos = SYNTAX_TABLE_BYTE_TO_CHAR (POS_AS_IN_BUFFER (pos)); |
cc9b4df2 | 4333 | SETUP_SYNTAX_TABLE_FOR_OBJECT (re_match_object, charpos, 1); |
b18215fc RS |
4334 | #endif |
4335 | ||
4336 | result = re_match_2_internal (bufp, string1, size1, string2, size2, | |
cc9b4df2 | 4337 | pos, regs, stop); |
fa9a63c5 RM |
4338 | alloca (0); |
4339 | return result; | |
4340 | } | |
4341 | ||
4342 | /* This is a separate function so that we can force an alloca cleanup | |
25fe55af | 4343 | afterwards. */ |
fa9a63c5 RM |
4344 | static int |
4345 | re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop) | |
4346 | struct re_pattern_buffer *bufp; | |
66f0296e | 4347 | re_char *string1, *string2; |
fa9a63c5 RM |
4348 | int size1, size2; |
4349 | int pos; | |
4350 | struct re_registers *regs; | |
4351 | int stop; | |
4352 | { | |
4353 | /* General temporaries. */ | |
4354 | int mcnt; | |
66f0296e | 4355 | boolean not; |
fa9a63c5 RM |
4356 | unsigned char *p1; |
4357 | ||
4358 | /* Just past the end of the corresponding string. */ | |
66f0296e | 4359 | re_char *end1, *end2; |
fa9a63c5 RM |
4360 | |
4361 | /* Pointers into string1 and string2, just past the last characters in | |
25fe55af | 4362 | each to consider matching. */ |
66f0296e | 4363 | re_char *end_match_1, *end_match_2; |
fa9a63c5 RM |
4364 | |
4365 | /* Where we are in the data, and the end of the current string. */ | |
66f0296e | 4366 | re_char *d, *dend; |
5e69f11e | 4367 | |
99633e97 SM |
4368 | /* Used sometimes to remember where we were before starting matching |
4369 | an operator so that we can go back in case of failure. This "atomic" | |
4370 | behavior of matching opcodes is indispensable to the correctness | |
4371 | of the on_failure_keep_string_jump optimization. */ | |
4372 | re_char *dfail; | |
4373 | ||
fa9a63c5 RM |
4374 | /* Where we are in the pattern, and the end of the pattern. */ |
4375 | unsigned char *p = bufp->buffer; | |
4376 | register unsigned char *pend = p + bufp->used; | |
4377 | ||
25fe55af | 4378 | /* We use this to map every character in the string. */ |
6676cb1c | 4379 | RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 | 4380 | |
25fe55af | 4381 | /* Nonzero if we have to concern multibyte character. */ |
2d1675e4 | 4382 | const boolean multibyte = RE_MULTIBYTE_P (bufp); |
b18215fc | 4383 | |
fa9a63c5 RM |
4384 | /* Failure point stack. Each place that can handle a failure further |
4385 | down the line pushes a failure point on this stack. It consists of | |
505bde11 | 4386 | regstart, and regend for all registers corresponding to |
fa9a63c5 RM |
4387 | the subexpressions we're currently inside, plus the number of such |
4388 | registers, and, finally, two char *'s. The first char * is where | |
4389 | to resume scanning the pattern; the second one is where to resume | |
505bde11 | 4390 | scanning the strings. */ |
25fe55af | 4391 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global. */ |
fa9a63c5 RM |
4392 | fail_stack_type fail_stack; |
4393 | #endif | |
4394 | #ifdef DEBUG | |
4395 | static unsigned failure_id = 0; | |
4396 | unsigned nfailure_points_pushed = 0, nfailure_points_popped = 0; | |
4397 | #endif | |
4398 | ||
99633e97 | 4399 | #if defined (REL_ALLOC) && defined (REGEX_MALLOC) |
fa9a63c5 RM |
4400 | /* This holds the pointer to the failure stack, when |
4401 | it is allocated relocatably. */ | |
4402 | fail_stack_elt_t *failure_stack_ptr; | |
99633e97 | 4403 | #endif |
fa9a63c5 RM |
4404 | |
4405 | /* We fill all the registers internally, independent of what we | |
25fe55af | 4406 | return, for use in backreferences. The number here includes |
fa9a63c5 RM |
4407 | an element for register zero. */ |
4408 | unsigned num_regs = bufp->re_nsub + 1; | |
5e69f11e | 4409 | |
fa9a63c5 RM |
4410 | /* Information on the contents of registers. These are pointers into |
4411 | the input strings; they record just what was matched (on this | |
4412 | attempt) by a subexpression part of the pattern, that is, the | |
4413 | regnum-th regstart pointer points to where in the pattern we began | |
4414 | matching and the regnum-th regend points to right after where we | |
4415 | stopped matching the regnum-th subexpression. (The zeroth register | |
4416 | keeps track of what the whole pattern matches.) */ | |
4417 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
66f0296e | 4418 | re_char **regstart, **regend; |
fa9a63c5 RM |
4419 | #endif |
4420 | ||
fa9a63c5 | 4421 | /* The following record the register info as found in the above |
5e69f11e | 4422 | variables when we find a match better than any we've seen before. |
fa9a63c5 RM |
4423 | This happens as we backtrack through the failure points, which in |
4424 | turn happens only if we have not yet matched the entire string. */ | |
4425 | unsigned best_regs_set = false; | |
4426 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
66f0296e | 4427 | re_char **best_regstart, **best_regend; |
fa9a63c5 | 4428 | #endif |
5e69f11e | 4429 | |
fa9a63c5 RM |
4430 | /* Logically, this is `best_regend[0]'. But we don't want to have to |
4431 | allocate space for that if we're not allocating space for anything | |
25fe55af | 4432 | else (see below). Also, we never need info about register 0 for |
fa9a63c5 RM |
4433 | any of the other register vectors, and it seems rather a kludge to |
4434 | treat `best_regend' differently than the rest. So we keep track of | |
4435 | the end of the best match so far in a separate variable. We | |
4436 | initialize this to NULL so that when we backtrack the first time | |
4437 | and need to test it, it's not garbage. */ | |
66f0296e | 4438 | re_char *match_end = NULL; |
fa9a63c5 | 4439 | |
fa9a63c5 RM |
4440 | #ifdef DEBUG |
4441 | /* Counts the total number of registers pushed. */ | |
5e69f11e | 4442 | unsigned num_regs_pushed = 0; |
fa9a63c5 RM |
4443 | #endif |
4444 | ||
4445 | DEBUG_PRINT1 ("\n\nEntering re_match_2.\n"); | |
5e69f11e | 4446 | |
fa9a63c5 | 4447 | INIT_FAIL_STACK (); |
5e69f11e | 4448 | |
fa9a63c5 RM |
4449 | #ifdef MATCH_MAY_ALLOCATE |
4450 | /* Do not bother to initialize all the register variables if there are | |
4451 | no groups in the pattern, as it takes a fair amount of time. If | |
4452 | there are groups, we include space for register 0 (the whole | |
4453 | pattern), even though we never use it, since it simplifies the | |
4454 | array indexing. We should fix this. */ | |
4455 | if (bufp->re_nsub) | |
4456 | { | |
66f0296e SM |
4457 | regstart = REGEX_TALLOC (num_regs, re_char *); |
4458 | regend = REGEX_TALLOC (num_regs, re_char *); | |
4459 | best_regstart = REGEX_TALLOC (num_regs, re_char *); | |
4460 | best_regend = REGEX_TALLOC (num_regs, re_char *); | |
fa9a63c5 | 4461 | |
505bde11 | 4462 | if (!(regstart && regend && best_regstart && best_regend)) |
25fe55af RS |
4463 | { |
4464 | FREE_VARIABLES (); | |
4465 | return -2; | |
4466 | } | |
fa9a63c5 RM |
4467 | } |
4468 | else | |
4469 | { | |
4470 | /* We must initialize all our variables to NULL, so that | |
25fe55af | 4471 | `FREE_VARIABLES' doesn't try to free them. */ |
505bde11 | 4472 | regstart = regend = best_regstart = best_regend = NULL; |
fa9a63c5 RM |
4473 | } |
4474 | #endif /* MATCH_MAY_ALLOCATE */ | |
4475 | ||
4476 | /* The starting position is bogus. */ | |
4477 | if (pos < 0 || pos > size1 + size2) | |
4478 | { | |
4479 | FREE_VARIABLES (); | |
4480 | return -1; | |
4481 | } | |
5e69f11e | 4482 | |
fa9a63c5 RM |
4483 | /* Initialize subexpression text positions to -1 to mark ones that no |
4484 | start_memory/stop_memory has been seen for. Also initialize the | |
4485 | register information struct. */ | |
4486 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
99633e97 SM |
4487 | regstart[mcnt] = regend[mcnt] = REG_UNSET_VALUE; |
4488 | ||
fa9a63c5 | 4489 | /* We move `string1' into `string2' if the latter's empty -- but not if |
25fe55af | 4490 | `string1' is null. */ |
fa9a63c5 RM |
4491 | if (size2 == 0 && string1 != NULL) |
4492 | { | |
4493 | string2 = string1; | |
4494 | size2 = size1; | |
4495 | string1 = 0; | |
4496 | size1 = 0; | |
4497 | } | |
4498 | end1 = string1 + size1; | |
4499 | end2 = string2 + size2; | |
4500 | ||
5e69f11e | 4501 | /* `p' scans through the pattern as `d' scans through the data. |
fa9a63c5 RM |
4502 | `dend' is the end of the input string that `d' points within. `d' |
4503 | is advanced into the following input string whenever necessary, but | |
4504 | this happens before fetching; therefore, at the beginning of the | |
4505 | loop, `d' can be pointing at the end of a string, but it cannot | |
4506 | equal `string2'. */ | |
419d1c74 | 4507 | if (pos >= size1) |
fa9a63c5 | 4508 | { |
419d1c74 SM |
4509 | /* Only match within string2. */ |
4510 | d = string2 + pos - size1; | |
4511 | dend = end_match_2 = string2 + stop - size1; | |
4512 | end_match_1 = end1; /* Just to give it a value. */ | |
fa9a63c5 RM |
4513 | } |
4514 | else | |
4515 | { | |
f1ad044f | 4516 | if (stop < size1) |
419d1c74 SM |
4517 | { |
4518 | /* Only match within string1. */ | |
4519 | end_match_1 = string1 + stop; | |
4520 | /* BEWARE! | |
4521 | When we reach end_match_1, PREFETCH normally switches to string2. | |
4522 | But in the present case, this means that just doing a PREFETCH | |
4523 | makes us jump from `stop' to `gap' within the string. | |
4524 | What we really want here is for the search to stop as | |
4525 | soon as we hit end_match_1. That's why we set end_match_2 | |
4526 | to end_match_1 (since PREFETCH fails as soon as we hit | |
4527 | end_match_2). */ | |
4528 | end_match_2 = end_match_1; | |
4529 | } | |
4530 | else | |
f1ad044f SM |
4531 | { /* It's important to use this code when stop == size so that |
4532 | moving `d' from end1 to string2 will not prevent the d == dend | |
4533 | check from catching the end of string. */ | |
419d1c74 SM |
4534 | end_match_1 = end1; |
4535 | end_match_2 = string2 + stop - size1; | |
4536 | } | |
4537 | d = string1 + pos; | |
4538 | dend = end_match_1; | |
fa9a63c5 RM |
4539 | } |
4540 | ||
4541 | DEBUG_PRINT1 ("The compiled pattern is: "); | |
4542 | DEBUG_PRINT_COMPILED_PATTERN (bufp, p, pend); | |
4543 | DEBUG_PRINT1 ("The string to match is: `"); | |
4544 | DEBUG_PRINT_DOUBLE_STRING (d, string1, size1, string2, size2); | |
4545 | DEBUG_PRINT1 ("'\n"); | |
5e69f11e | 4546 | |
25fe55af | 4547 | /* This loops over pattern commands. It exits by returning from the |
fa9a63c5 RM |
4548 | function if the match is complete, or it drops through if the match |
4549 | fails at this starting point in the input data. */ | |
4550 | for (;;) | |
4551 | { | |
505bde11 | 4552 | DEBUG_PRINT2 ("\n%p: ", p); |
fa9a63c5 RM |
4553 | |
4554 | if (p == pend) | |
4555 | { /* End of pattern means we might have succeeded. */ | |
25fe55af | 4556 | DEBUG_PRINT1 ("end of pattern ... "); |
5e69f11e | 4557 | |
fa9a63c5 | 4558 | /* If we haven't matched the entire string, and we want the |
25fe55af RS |
4559 | longest match, try backtracking. */ |
4560 | if (d != end_match_2) | |
fa9a63c5 RM |
4561 | { |
4562 | /* 1 if this match ends in the same string (string1 or string2) | |
4563 | as the best previous match. */ | |
5e69f11e | 4564 | boolean same_str_p = (FIRST_STRING_P (match_end) |
99633e97 | 4565 | == FIRST_STRING_P (d)); |
fa9a63c5 RM |
4566 | /* 1 if this match is the best seen so far. */ |
4567 | boolean best_match_p; | |
4568 | ||
4569 | /* AIX compiler got confused when this was combined | |
25fe55af | 4570 | with the previous declaration. */ |
fa9a63c5 RM |
4571 | if (same_str_p) |
4572 | best_match_p = d > match_end; | |
4573 | else | |
99633e97 | 4574 | best_match_p = !FIRST_STRING_P (d); |
fa9a63c5 | 4575 | |
25fe55af RS |
4576 | DEBUG_PRINT1 ("backtracking.\n"); |
4577 | ||
4578 | if (!FAIL_STACK_EMPTY ()) | |
4579 | { /* More failure points to try. */ | |
4580 | ||
4581 | /* If exceeds best match so far, save it. */ | |
4582 | if (!best_regs_set || best_match_p) | |
4583 | { | |
4584 | best_regs_set = true; | |
4585 | match_end = d; | |
4586 | ||
4587 | DEBUG_PRINT1 ("\nSAVING match as best so far.\n"); | |
4588 | ||
4589 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
4590 | { | |
4591 | best_regstart[mcnt] = regstart[mcnt]; | |
4592 | best_regend[mcnt] = regend[mcnt]; | |
4593 | } | |
4594 | } | |
4595 | goto fail; | |
4596 | } | |
4597 | ||
4598 | /* If no failure points, don't restore garbage. And if | |
4599 | last match is real best match, don't restore second | |
4600 | best one. */ | |
4601 | else if (best_regs_set && !best_match_p) | |
4602 | { | |
4603 | restore_best_regs: | |
4604 | /* Restore best match. It may happen that `dend == | |
4605 | end_match_1' while the restored d is in string2. | |
4606 | For example, the pattern `x.*y.*z' against the | |
4607 | strings `x-' and `y-z-', if the two strings are | |
4608 | not consecutive in memory. */ | |
4609 | DEBUG_PRINT1 ("Restoring best registers.\n"); | |
4610 | ||
4611 | d = match_end; | |
4612 | dend = ((d >= string1 && d <= end1) | |
4613 | ? end_match_1 : end_match_2); | |
fa9a63c5 RM |
4614 | |
4615 | for (mcnt = 1; mcnt < num_regs; mcnt++) | |
4616 | { | |
4617 | regstart[mcnt] = best_regstart[mcnt]; | |
4618 | regend[mcnt] = best_regend[mcnt]; | |
4619 | } | |
25fe55af RS |
4620 | } |
4621 | } /* d != end_match_2 */ | |
fa9a63c5 RM |
4622 | |
4623 | succeed_label: | |
25fe55af | 4624 | DEBUG_PRINT1 ("Accepting match.\n"); |
fa9a63c5 | 4625 | |
25fe55af RS |
4626 | /* If caller wants register contents data back, do it. */ |
4627 | if (regs && !bufp->no_sub) | |
fa9a63c5 | 4628 | { |
25fe55af RS |
4629 | /* Have the register data arrays been allocated? */ |
4630 | if (bufp->regs_allocated == REGS_UNALLOCATED) | |
4631 | { /* No. So allocate them with malloc. We need one | |
4632 | extra element beyond `num_regs' for the `-1' marker | |
4633 | GNU code uses. */ | |
4634 | regs->num_regs = MAX (RE_NREGS, num_regs + 1); | |
4635 | regs->start = TALLOC (regs->num_regs, regoff_t); | |
4636 | regs->end = TALLOC (regs->num_regs, regoff_t); | |
4637 | if (regs->start == NULL || regs->end == NULL) | |
fa9a63c5 RM |
4638 | { |
4639 | FREE_VARIABLES (); | |
4640 | return -2; | |
4641 | } | |
25fe55af RS |
4642 | bufp->regs_allocated = REGS_REALLOCATE; |
4643 | } | |
4644 | else if (bufp->regs_allocated == REGS_REALLOCATE) | |
4645 | { /* Yes. If we need more elements than were already | |
4646 | allocated, reallocate them. If we need fewer, just | |
4647 | leave it alone. */ | |
4648 | if (regs->num_regs < num_regs + 1) | |
4649 | { | |
4650 | regs->num_regs = num_regs + 1; | |
4651 | RETALLOC (regs->start, regs->num_regs, regoff_t); | |
4652 | RETALLOC (regs->end, regs->num_regs, regoff_t); | |
4653 | if (regs->start == NULL || regs->end == NULL) | |
fa9a63c5 RM |
4654 | { |
4655 | FREE_VARIABLES (); | |
4656 | return -2; | |
4657 | } | |
25fe55af RS |
4658 | } |
4659 | } | |
4660 | else | |
fa9a63c5 RM |
4661 | { |
4662 | /* These braces fend off a "empty body in an else-statement" | |
25fe55af | 4663 | warning under GCC when assert expands to nothing. */ |
fa9a63c5 RM |
4664 | assert (bufp->regs_allocated == REGS_FIXED); |
4665 | } | |
4666 | ||
25fe55af RS |
4667 | /* Convert the pointer data in `regstart' and `regend' to |
4668 | indices. Register zero has to be set differently, | |
4669 | since we haven't kept track of any info for it. */ | |
4670 | if (regs->num_regs > 0) | |
4671 | { | |
4672 | regs->start[0] = pos; | |
99633e97 | 4673 | regs->end[0] = POINTER_TO_OFFSET (d); |
25fe55af | 4674 | } |
5e69f11e | 4675 | |
25fe55af RS |
4676 | /* Go through the first `min (num_regs, regs->num_regs)' |
4677 | registers, since that is all we initialized. */ | |
fa9a63c5 RM |
4678 | for (mcnt = 1; mcnt < MIN (num_regs, regs->num_regs); mcnt++) |
4679 | { | |
25fe55af RS |
4680 | if (REG_UNSET (regstart[mcnt]) || REG_UNSET (regend[mcnt])) |
4681 | regs->start[mcnt] = regs->end[mcnt] = -1; | |
4682 | else | |
4683 | { | |
fa9a63c5 RM |
4684 | regs->start[mcnt] |
4685 | = (regoff_t) POINTER_TO_OFFSET (regstart[mcnt]); | |
25fe55af | 4686 | regs->end[mcnt] |
fa9a63c5 | 4687 | = (regoff_t) POINTER_TO_OFFSET (regend[mcnt]); |
25fe55af | 4688 | } |
fa9a63c5 | 4689 | } |
5e69f11e | 4690 | |
25fe55af RS |
4691 | /* If the regs structure we return has more elements than |
4692 | were in the pattern, set the extra elements to -1. If | |
4693 | we (re)allocated the registers, this is the case, | |
4694 | because we always allocate enough to have at least one | |
4695 | -1 at the end. */ | |
4696 | for (mcnt = num_regs; mcnt < regs->num_regs; mcnt++) | |
4697 | regs->start[mcnt] = regs->end[mcnt] = -1; | |
fa9a63c5 RM |
4698 | } /* regs && !bufp->no_sub */ |
4699 | ||
25fe55af RS |
4700 | DEBUG_PRINT4 ("%u failure points pushed, %u popped (%u remain).\n", |
4701 | nfailure_points_pushed, nfailure_points_popped, | |
4702 | nfailure_points_pushed - nfailure_points_popped); | |
4703 | DEBUG_PRINT2 ("%u registers pushed.\n", num_regs_pushed); | |
fa9a63c5 | 4704 | |
99633e97 | 4705 | mcnt = POINTER_TO_OFFSET (d) - pos; |
fa9a63c5 | 4706 | |
25fe55af | 4707 | DEBUG_PRINT2 ("Returning %d from re_match_2.\n", mcnt); |
fa9a63c5 | 4708 | |
25fe55af RS |
4709 | FREE_VARIABLES (); |
4710 | return mcnt; | |
4711 | } | |
fa9a63c5 | 4712 | |
25fe55af | 4713 | /* Otherwise match next pattern command. */ |
fa9a63c5 RM |
4714 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++)) |
4715 | { | |
25fe55af RS |
4716 | /* Ignore these. Used to ignore the n of succeed_n's which |
4717 | currently have n == 0. */ | |
4718 | case no_op: | |
4719 | DEBUG_PRINT1 ("EXECUTING no_op.\n"); | |
4720 | break; | |
fa9a63c5 RM |
4721 | |
4722 | case succeed: | |
25fe55af | 4723 | DEBUG_PRINT1 ("EXECUTING succeed.\n"); |
fa9a63c5 RM |
4724 | goto succeed_label; |
4725 | ||
25fe55af RS |
4726 | /* Match the next n pattern characters exactly. The following |
4727 | byte in the pattern defines n, and the n bytes after that | |
4728 | are the characters to match. */ | |
fa9a63c5 RM |
4729 | case exactn: |
4730 | mcnt = *p++; | |
25fe55af | 4731 | DEBUG_PRINT2 ("EXECUTING exactn %d.\n", mcnt); |
fa9a63c5 | 4732 | |
99633e97 SM |
4733 | /* Remember the start point to rollback upon failure. */ |
4734 | dfail = d; | |
4735 | ||
25fe55af RS |
4736 | /* This is written out as an if-else so we don't waste time |
4737 | testing `translate' inside the loop. */ | |
28703c16 | 4738 | if (RE_TRANSLATE_P (translate)) |
fa9a63c5 | 4739 | { |
e934739e RS |
4740 | if (multibyte) |
4741 | do | |
4742 | { | |
4743 | int pat_charlen, buf_charlen; | |
e71b1971 | 4744 | unsigned int pat_ch, buf_ch; |
e934739e RS |
4745 | |
4746 | PREFETCH (); | |
4747 | pat_ch = STRING_CHAR_AND_LENGTH (p, pend - p, pat_charlen); | |
4748 | buf_ch = STRING_CHAR_AND_LENGTH (d, dend - d, buf_charlen); | |
4749 | ||
4750 | if (RE_TRANSLATE (translate, buf_ch) | |
4751 | != pat_ch) | |
99633e97 SM |
4752 | { |
4753 | d = dfail; | |
4754 | goto fail; | |
4755 | } | |
e934739e RS |
4756 | |
4757 | p += pat_charlen; | |
4758 | d += buf_charlen; | |
4759 | mcnt -= pat_charlen; | |
4760 | } | |
4761 | while (mcnt > 0); | |
4762 | else | |
e934739e RS |
4763 | do |
4764 | { | |
4765 | PREFETCH (); | |
66f0296e | 4766 | if (RE_TRANSLATE (translate, *d) != *p++) |
99633e97 SM |
4767 | { |
4768 | d = dfail; | |
4769 | goto fail; | |
4770 | } | |
33c46939 | 4771 | d++; |
e934739e RS |
4772 | } |
4773 | while (--mcnt); | |
fa9a63c5 RM |
4774 | } |
4775 | else | |
4776 | { | |
4777 | do | |
4778 | { | |
4779 | PREFETCH (); | |
99633e97 SM |
4780 | if (*d++ != *p++) |
4781 | { | |
4782 | d = dfail; | |
4783 | goto fail; | |
4784 | } | |
fa9a63c5 RM |
4785 | } |
4786 | while (--mcnt); | |
4787 | } | |
25fe55af | 4788 | break; |
fa9a63c5 RM |
4789 | |
4790 | ||
25fe55af | 4791 | /* Match any character except possibly a newline or a null. */ |
fa9a63c5 | 4792 | case anychar: |
e934739e RS |
4793 | { |
4794 | int buf_charlen; | |
e71b1971 | 4795 | unsigned int buf_ch; |
fa9a63c5 | 4796 | |
e934739e | 4797 | DEBUG_PRINT1 ("EXECUTING anychar.\n"); |
fa9a63c5 | 4798 | |
e934739e | 4799 | PREFETCH (); |
2d1675e4 | 4800 | buf_ch = RE_STRING_CHAR_AND_LENGTH (d, dend - d, buf_charlen); |
e934739e RS |
4801 | buf_ch = TRANSLATE (buf_ch); |
4802 | ||
4803 | if ((!(bufp->syntax & RE_DOT_NEWLINE) | |
4804 | && buf_ch == '\n') | |
4805 | || ((bufp->syntax & RE_DOT_NOT_NULL) | |
4806 | && buf_ch == '\000')) | |
4807 | goto fail; | |
4808 | ||
e934739e RS |
4809 | DEBUG_PRINT2 (" Matched `%d'.\n", *d); |
4810 | d += buf_charlen; | |
4811 | } | |
fa9a63c5 RM |
4812 | break; |
4813 | ||
4814 | ||
4815 | case charset: | |
4816 | case charset_not: | |
4817 | { | |
b18215fc | 4818 | register unsigned int c; |
fa9a63c5 | 4819 | boolean not = (re_opcode_t) *(p - 1) == charset_not; |
b18215fc RS |
4820 | int len; |
4821 | ||
4822 | /* Start of actual range_table, or end of bitmap if there is no | |
4823 | range table. */ | |
4824 | unsigned char *range_table; | |
4825 | ||
96cc36cc | 4826 | /* Nonzero if there is a range table. */ |
b18215fc RS |
4827 | int range_table_exists; |
4828 | ||
96cc36cc RS |
4829 | /* Number of ranges of range table. This is not included |
4830 | in the initial byte-length of the command. */ | |
4831 | int count = 0; | |
fa9a63c5 | 4832 | |
25fe55af | 4833 | DEBUG_PRINT2 ("EXECUTING charset%s.\n", not ? "_not" : ""); |
fa9a63c5 | 4834 | |
b18215fc | 4835 | range_table_exists = CHARSET_RANGE_TABLE_EXISTS_P (&p[-1]); |
96cc36cc | 4836 | |
b18215fc | 4837 | if (range_table_exists) |
96cc36cc RS |
4838 | { |
4839 | range_table = CHARSET_RANGE_TABLE (&p[-1]); /* Past the bitmap. */ | |
4840 | EXTRACT_NUMBER_AND_INCR (count, range_table); | |
4841 | } | |
b18215fc | 4842 | |
2d1675e4 SM |
4843 | PREFETCH (); |
4844 | c = RE_STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
4845 | c = TRANSLATE (c); /* The character to match. */ | |
b18215fc RS |
4846 | |
4847 | if (SINGLE_BYTE_CHAR_P (c)) | |
4848 | { /* Lookup bitmap. */ | |
b18215fc RS |
4849 | /* Cast to `unsigned' instead of `unsigned char' in |
4850 | case the bit list is a full 32 bytes long. */ | |
4851 | if (c < (unsigned) (CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH) | |
96cc36cc RS |
4852 | && p[1 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH))) |
4853 | not = !not; | |
b18215fc | 4854 | } |
96cc36cc | 4855 | #ifdef emacs |
b18215fc | 4856 | else if (range_table_exists) |
96cc36cc RS |
4857 | { |
4858 | int class_bits = CHARSET_RANGE_TABLE_BITS (&p[-1]); | |
4859 | ||
4860 | if ( (class_bits & BIT_ALNUM && ISALNUM (c)) | |
4861 | | (class_bits & BIT_ALPHA && ISALPHA (c)) | |
f71b19b6 | 4862 | | (class_bits & BIT_ASCII && IS_REAL_ASCII (c)) |
96cc36cc RS |
4863 | | (class_bits & BIT_GRAPH && ISGRAPH (c)) |
4864 | | (class_bits & BIT_LOWER && ISLOWER (c)) | |
f71b19b6 DL |
4865 | | (class_bits & BIT_MULTIBYTE && !ISUNIBYTE (c)) |
4866 | | (class_bits & BIT_NONASCII && !IS_REAL_ASCII (c)) | |
96cc36cc RS |
4867 | | (class_bits & BIT_PRINT && ISPRINT (c)) |
4868 | | (class_bits & BIT_PUNCT && ISPUNCT (c)) | |
4869 | | (class_bits & BIT_SPACE && ISSPACE (c)) | |
f71b19b6 | 4870 | | (class_bits & BIT_UNIBYTE && ISUNIBYTE (c)) |
96cc36cc RS |
4871 | | (class_bits & BIT_UPPER && ISUPPER (c)) |
4872 | | (class_bits & BIT_WORD && ISWORD (c))) | |
4873 | not = !not; | |
4874 | else | |
4875 | CHARSET_LOOKUP_RANGE_TABLE_RAW (not, c, range_table, count); | |
4876 | } | |
4877 | #endif /* emacs */ | |
fa9a63c5 | 4878 | |
96cc36cc RS |
4879 | if (range_table_exists) |
4880 | p = CHARSET_RANGE_TABLE_END (range_table, count); | |
4881 | else | |
4882 | p += CHARSET_BITMAP_SIZE (&p[-1]) + 1; | |
fa9a63c5 RM |
4883 | |
4884 | if (!not) goto fail; | |
5e69f11e | 4885 | |
b18215fc | 4886 | d += len; |
fa9a63c5 RM |
4887 | break; |
4888 | } | |
4889 | ||
4890 | ||
25fe55af | 4891 | /* The beginning of a group is represented by start_memory. |
505bde11 | 4892 | The argument is the register number. The text |
25fe55af RS |
4893 | matched within the group is recorded (in the internal |
4894 | registers data structure) under the register number. */ | |
4895 | case start_memory: | |
505bde11 SM |
4896 | DEBUG_PRINT2 ("EXECUTING start_memory %d:\n", *p); |
4897 | ||
4898 | /* In case we need to undo this operation (via backtracking). */ | |
4899 | PUSH_FAILURE_REG ((unsigned int)*p); | |
fa9a63c5 | 4900 | |
25fe55af | 4901 | regstart[*p] = d; |
505bde11 | 4902 | regend[*p] = REG_UNSET_VALUE; /* probably unnecessary. -sm */ |
fa9a63c5 RM |
4903 | DEBUG_PRINT2 (" regstart: %d\n", POINTER_TO_OFFSET (regstart[*p])); |
4904 | ||
25fe55af | 4905 | /* Move past the register number and inner group count. */ |
505bde11 | 4906 | p += 1; |
25fe55af | 4907 | break; |
fa9a63c5 RM |
4908 | |
4909 | ||
25fe55af | 4910 | /* The stop_memory opcode represents the end of a group. Its |
505bde11 | 4911 | argument is the same as start_memory's: the register number. */ |
fa9a63c5 | 4912 | case stop_memory: |
505bde11 SM |
4913 | DEBUG_PRINT2 ("EXECUTING stop_memory %d:\n", *p); |
4914 | ||
4915 | assert (!REG_UNSET (regstart[*p])); | |
4916 | /* Strictly speaking, there should be code such as: | |
4917 | ||
4918 | assert (REG_UNSET (regend[*p])); | |
4919 | PUSH_FAILURE_REGSTOP ((unsigned int)*p); | |
4920 | ||
4921 | But the only info to be pushed is regend[*p] and it is known to | |
4922 | be UNSET, so there really isn't anything to push. | |
4923 | Not pushing anything, on the other hand deprives us from the | |
4924 | guarantee that regend[*p] is UNSET since undoing this operation | |
4925 | will not reset its value properly. This is not important since | |
4926 | the value will only be read on the next start_memory or at | |
4927 | the very end and both events can only happen if this stop_memory | |
4928 | is *not* undone. */ | |
fa9a63c5 | 4929 | |
25fe55af | 4930 | regend[*p] = d; |
fa9a63c5 RM |
4931 | DEBUG_PRINT2 (" regend: %d\n", POINTER_TO_OFFSET (regend[*p])); |
4932 | ||
25fe55af | 4933 | /* Move past the register number and the inner group count. */ |
505bde11 | 4934 | p += 1; |
25fe55af | 4935 | break; |
fa9a63c5 RM |
4936 | |
4937 | ||
4938 | /* \<digit> has been turned into a `duplicate' command which is | |
25fe55af RS |
4939 | followed by the numeric value of <digit> as the register number. */ |
4940 | case duplicate: | |
fa9a63c5 | 4941 | { |
66f0296e | 4942 | register re_char *d2, *dend2; |
25fe55af | 4943 | int regno = *p++; /* Get which register to match against. */ |
fa9a63c5 RM |
4944 | DEBUG_PRINT2 ("EXECUTING duplicate %d.\n", regno); |
4945 | ||
25fe55af RS |
4946 | /* Can't back reference a group which we've never matched. */ |
4947 | if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno])) | |
4948 | goto fail; | |
5e69f11e | 4949 | |
25fe55af RS |
4950 | /* Where in input to try to start matching. */ |
4951 | d2 = regstart[regno]; | |
5e69f11e | 4952 | |
99633e97 SM |
4953 | /* Remember the start point to rollback upon failure. */ |
4954 | dfail = d; | |
4955 | ||
25fe55af RS |
4956 | /* Where to stop matching; if both the place to start and |
4957 | the place to stop matching are in the same string, then | |
4958 | set to the place to stop, otherwise, for now have to use | |
4959 | the end of the first string. */ | |
fa9a63c5 | 4960 | |
25fe55af | 4961 | dend2 = ((FIRST_STRING_P (regstart[regno]) |
fa9a63c5 RM |
4962 | == FIRST_STRING_P (regend[regno])) |
4963 | ? regend[regno] : end_match_1); | |
4964 | for (;;) | |
4965 | { | |
4966 | /* If necessary, advance to next segment in register | |
25fe55af | 4967 | contents. */ |
fa9a63c5 RM |
4968 | while (d2 == dend2) |
4969 | { | |
4970 | if (dend2 == end_match_2) break; | |
4971 | if (dend2 == regend[regno]) break; | |
4972 | ||
25fe55af RS |
4973 | /* End of string1 => advance to string2. */ |
4974 | d2 = string2; | |
4975 | dend2 = regend[regno]; | |
fa9a63c5 RM |
4976 | } |
4977 | /* At end of register contents => success */ | |
4978 | if (d2 == dend2) break; | |
4979 | ||
4980 | /* If necessary, advance to next segment in data. */ | |
4981 | PREFETCH (); | |
4982 | ||
4983 | /* How many characters left in this segment to match. */ | |
4984 | mcnt = dend - d; | |
5e69f11e | 4985 | |
fa9a63c5 | 4986 | /* Want how many consecutive characters we can match in |
25fe55af RS |
4987 | one shot, so, if necessary, adjust the count. */ |
4988 | if (mcnt > dend2 - d2) | |
fa9a63c5 | 4989 | mcnt = dend2 - d2; |
5e69f11e | 4990 | |
fa9a63c5 | 4991 | /* Compare that many; failure if mismatch, else move |
25fe55af | 4992 | past them. */ |
28703c16 | 4993 | if (RE_TRANSLATE_P (translate) |
2d1675e4 | 4994 | ? bcmp_translate (d, d2, mcnt, translate, multibyte) |
25fe55af | 4995 | : bcmp (d, d2, mcnt)) |
99633e97 SM |
4996 | { |
4997 | d = dfail; | |
4998 | goto fail; | |
4999 | } | |
fa9a63c5 | 5000 | d += mcnt, d2 += mcnt; |
fa9a63c5 RM |
5001 | } |
5002 | } | |
5003 | break; | |
5004 | ||
5005 | ||
25fe55af RS |
5006 | /* begline matches the empty string at the beginning of the string |
5007 | (unless `not_bol' is set in `bufp'), and, if | |
5008 | `newline_anchor' is set, after newlines. */ | |
fa9a63c5 | 5009 | case begline: |
25fe55af | 5010 | DEBUG_PRINT1 ("EXECUTING begline.\n"); |
5e69f11e | 5011 | |
25fe55af RS |
5012 | if (AT_STRINGS_BEG (d)) |
5013 | { | |
5014 | if (!bufp->not_bol) break; | |
5015 | } | |
419d1c74 | 5016 | else |
25fe55af | 5017 | { |
419d1c74 SM |
5018 | unsigned char c; |
5019 | GET_CHAR_BEFORE_2 (c, d, string1, end1, string2, end2); | |
5020 | if (c == '\n' && bufp->newline_anchor) | |
5021 | break; | |
25fe55af RS |
5022 | } |
5023 | /* In all other cases, we fail. */ | |
5024 | goto fail; | |
fa9a63c5 RM |
5025 | |
5026 | ||
25fe55af | 5027 | /* endline is the dual of begline. */ |
fa9a63c5 | 5028 | case endline: |
25fe55af | 5029 | DEBUG_PRINT1 ("EXECUTING endline.\n"); |
fa9a63c5 | 5030 | |
25fe55af RS |
5031 | if (AT_STRINGS_END (d)) |
5032 | { | |
5033 | if (!bufp->not_eol) break; | |
5034 | } | |
f1ad044f | 5035 | else |
25fe55af | 5036 | { |
f1ad044f SM |
5037 | PREFETCH_NOLIMIT (); |
5038 | if (*d == '\n' && bufp->newline_anchor) | |
5039 | break; | |
25fe55af RS |
5040 | } |
5041 | goto fail; | |
fa9a63c5 RM |
5042 | |
5043 | ||
5044 | /* Match at the very beginning of the data. */ | |
25fe55af RS |
5045 | case begbuf: |
5046 | DEBUG_PRINT1 ("EXECUTING begbuf.\n"); | |
5047 | if (AT_STRINGS_BEG (d)) | |
5048 | break; | |
5049 | goto fail; | |
fa9a63c5 RM |
5050 | |
5051 | ||
5052 | /* Match at the very end of the data. */ | |
25fe55af RS |
5053 | case endbuf: |
5054 | DEBUG_PRINT1 ("EXECUTING endbuf.\n"); | |
fa9a63c5 RM |
5055 | if (AT_STRINGS_END (d)) |
5056 | break; | |
25fe55af | 5057 | goto fail; |
5e69f11e | 5058 | |
5e69f11e | 5059 | |
25fe55af RS |
5060 | /* on_failure_keep_string_jump is used to optimize `.*\n'. It |
5061 | pushes NULL as the value for the string on the stack. Then | |
505bde11 | 5062 | `POP_FAILURE_POINT' will keep the current value for the |
25fe55af RS |
5063 | string, instead of restoring it. To see why, consider |
5064 | matching `foo\nbar' against `.*\n'. The .* matches the foo; | |
5065 | then the . fails against the \n. But the next thing we want | |
5066 | to do is match the \n against the \n; if we restored the | |
5067 | string value, we would be back at the foo. | |
5068 | ||
5069 | Because this is used only in specific cases, we don't need to | |
5070 | check all the things that `on_failure_jump' does, to make | |
5071 | sure the right things get saved on the stack. Hence we don't | |
5072 | share its code. The only reason to push anything on the | |
5073 | stack at all is that otherwise we would have to change | |
5074 | `anychar's code to do something besides goto fail in this | |
5075 | case; that seems worse than this. */ | |
5076 | case on_failure_keep_string_jump: | |
505bde11 SM |
5077 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
5078 | DEBUG_PRINT3 ("EXECUTING on_failure_keep_string_jump %d (to %p):\n", | |
5079 | mcnt, p + mcnt); | |
fa9a63c5 | 5080 | |
505bde11 SM |
5081 | PUSH_FAILURE_POINT (p - 3, NULL); |
5082 | break; | |
5083 | ||
0683b6fa SM |
5084 | /* A nasty loop is introduced by the non-greedy *? and +?. |
5085 | With such loops, the stack only ever contains one failure point | |
5086 | at a time, so that a plain on_failure_jump_loop kind of | |
5087 | cycle detection cannot work. Worse yet, such a detection | |
5088 | can not only fail to detect a cycle, but it can also wrongly | |
5089 | detect a cycle (between different instantiations of the same | |
5090 | loop. | |
5091 | So the method used for those nasty loops is a little different: | |
5092 | We use a special cycle-detection-stack-frame which is pushed | |
5093 | when the on_failure_jump_nastyloop failure-point is *popped*. | |
5094 | This special frame thus marks the beginning of one iteration | |
5095 | through the loop and we can hence easily check right here | |
5096 | whether something matched between the beginning and the end of | |
5097 | the loop. */ | |
5098 | case on_failure_jump_nastyloop: | |
5099 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
5100 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_nastyloop %d (to %p):\n", | |
5101 | mcnt, p + mcnt); | |
5102 | ||
5103 | assert ((re_opcode_t)p[-4] == no_op); | |
5104 | CHECK_INFINITE_LOOP (p - 4, d); | |
5105 | PUSH_FAILURE_POINT (p - 3, d); | |
5106 | break; | |
5107 | ||
505bde11 | 5108 | |
4e8a9132 SM |
5109 | /* Simple loop detecting on_failure_jump: just check on the |
5110 | failure stack if the same spot was already hit earlier. */ | |
505bde11 SM |
5111 | case on_failure_jump_loop: |
5112 | on_failure: | |
5113 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
5114 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_loop %d (to %p):\n", | |
5115 | mcnt, p + mcnt); | |
5116 | ||
5117 | CHECK_INFINITE_LOOP (p - 3, d); | |
5118 | PUSH_FAILURE_POINT (p - 3, d); | |
25fe55af | 5119 | break; |
fa9a63c5 RM |
5120 | |
5121 | ||
5122 | /* Uses of on_failure_jump: | |
5e69f11e | 5123 | |
25fe55af RS |
5124 | Each alternative starts with an on_failure_jump that points |
5125 | to the beginning of the next alternative. Each alternative | |
5126 | except the last ends with a jump that in effect jumps past | |
5127 | the rest of the alternatives. (They really jump to the | |
5128 | ending jump of the following alternative, because tensioning | |
5129 | these jumps is a hassle.) | |
fa9a63c5 | 5130 | |
25fe55af RS |
5131 | Repeats start with an on_failure_jump that points past both |
5132 | the repetition text and either the following jump or | |
5133 | pop_failure_jump back to this on_failure_jump. */ | |
fa9a63c5 | 5134 | case on_failure_jump: |
27c3b45d | 5135 | QUIT; |
25fe55af | 5136 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
505bde11 SM |
5137 | DEBUG_PRINT3 ("EXECUTING on_failure_jump %d (to %p):\n", |
5138 | mcnt, p + mcnt); | |
25fe55af | 5139 | |
505bde11 | 5140 | PUSH_FAILURE_POINT (p -3, d); |
25fe55af RS |
5141 | break; |
5142 | ||
4e8a9132 | 5143 | /* This operation is used for greedy *. |
505bde11 SM |
5144 | Compare the beginning of the repeat with what in the |
5145 | pattern follows its end. If we can establish that there | |
5146 | is nothing that they would both match, i.e., that we | |
5147 | would have to backtrack because of (as in, e.g., `a*a') | |
5148 | then we can use a non-backtracking loop based on | |
4e8a9132 | 5149 | on_failure_keep_string_jump instead of on_failure_jump. */ |
505bde11 | 5150 | case on_failure_jump_smart: |
27c3b45d | 5151 | QUIT; |
25fe55af | 5152 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
505bde11 SM |
5153 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_smart %d (to %p).\n", |
5154 | mcnt, p + mcnt); | |
25fe55af | 5155 | { |
505bde11 SM |
5156 | unsigned char *p1 = p; /* Next operation. */ |
5157 | unsigned char *p2 = p + mcnt; /* Destination of the jump. */ | |
fa9a63c5 | 5158 | |
505bde11 SM |
5159 | p -= 3; /* Reset so that we will re-execute the |
5160 | instruction once it's been changed. */ | |
fa9a63c5 | 5161 | |
4e8a9132 SM |
5162 | EXTRACT_NUMBER (mcnt, p2 - 2); |
5163 | ||
5164 | /* Ensure this is a indeed the trivial kind of loop | |
5165 | we are expecting. */ | |
5166 | assert (skip_one_char (p1) == p2 - 3); | |
5167 | assert ((re_opcode_t) p2[-3] == jump && p2 + mcnt == p); | |
99633e97 | 5168 | DEBUG_STATEMENT (debug += 2); |
505bde11 | 5169 | if (mutually_exclusive_p (bufp, p1, p2)) |
fa9a63c5 | 5170 | { |
505bde11 | 5171 | /* Use a fast `on_failure_keep_string_jump' loop. */ |
4e8a9132 SM |
5172 | DEBUG_PRINT1 (" smart exclusive => fast loop.\n"); |
5173 | *p = (unsigned char) on_failure_keep_string_jump; | |
5174 | STORE_NUMBER (p2 - 2, mcnt + 3); | |
25fe55af | 5175 | } |
505bde11 | 5176 | else |
fa9a63c5 | 5177 | { |
505bde11 SM |
5178 | /* Default to a safe `on_failure_jump' loop. */ |
5179 | DEBUG_PRINT1 (" smart default => slow loop.\n"); | |
4e8a9132 | 5180 | *p = (unsigned char) on_failure_jump; |
fa9a63c5 | 5181 | } |
99633e97 | 5182 | DEBUG_STATEMENT (debug -= 2); |
25fe55af | 5183 | } |
505bde11 | 5184 | break; |
25fe55af RS |
5185 | |
5186 | /* Unconditionally jump (without popping any failure points). */ | |
5187 | case jump: | |
fa9a63c5 | 5188 | unconditional_jump: |
27c3b45d | 5189 | QUIT; |
fa9a63c5 | 5190 | EXTRACT_NUMBER_AND_INCR (mcnt, p); /* Get the amount to jump. */ |
25fe55af RS |
5191 | DEBUG_PRINT2 ("EXECUTING jump %d ", mcnt); |
5192 | p += mcnt; /* Do the jump. */ | |
505bde11 | 5193 | DEBUG_PRINT2 ("(to %p).\n", p); |
25fe55af RS |
5194 | break; |
5195 | ||
5196 | ||
25fe55af RS |
5197 | /* Have to succeed matching what follows at least n times. |
5198 | After that, handle like `on_failure_jump'. */ | |
5199 | case succeed_n: | |
5200 | EXTRACT_NUMBER (mcnt, p + 2); | |
5201 | DEBUG_PRINT2 ("EXECUTING succeed_n %d.\n", mcnt); | |
5e69f11e | 5202 | |
25fe55af RS |
5203 | assert (mcnt >= 0); |
5204 | /* Originally, this is how many times we HAVE to succeed. */ | |
5205 | if (mcnt > 0) | |
5206 | { | |
5207 | mcnt--; | |
fa9a63c5 | 5208 | p += 2; |
25fe55af | 5209 | STORE_NUMBER_AND_INCR (p, mcnt); |
505bde11 | 5210 | DEBUG_PRINT3 (" Setting %p to %d.\n", p, mcnt); |
25fe55af | 5211 | } |
fa9a63c5 | 5212 | else if (mcnt == 0) |
25fe55af | 5213 | { |
505bde11 | 5214 | DEBUG_PRINT2 (" Setting two bytes from %p to no_op.\n", p+2); |
fa9a63c5 | 5215 | p[2] = (unsigned char) no_op; |
25fe55af RS |
5216 | p[3] = (unsigned char) no_op; |
5217 | goto on_failure; | |
5218 | } | |
5219 | break; | |
5220 | ||
5221 | case jump_n: | |
5222 | EXTRACT_NUMBER (mcnt, p + 2); | |
5223 | DEBUG_PRINT2 ("EXECUTING jump_n %d.\n", mcnt); | |
5224 | ||
5225 | /* Originally, this is how many times we CAN jump. */ | |
5226 | if (mcnt) | |
5227 | { | |
5228 | mcnt--; | |
5229 | STORE_NUMBER (p + 2, mcnt); | |
5e69f11e | 5230 | goto unconditional_jump; |
25fe55af RS |
5231 | } |
5232 | /* If don't have to jump any more, skip over the rest of command. */ | |
5e69f11e RM |
5233 | else |
5234 | p += 4; | |
25fe55af | 5235 | break; |
5e69f11e | 5236 | |
fa9a63c5 RM |
5237 | case set_number_at: |
5238 | { | |
25fe55af | 5239 | DEBUG_PRINT1 ("EXECUTING set_number_at.\n"); |
fa9a63c5 | 5240 | |
25fe55af RS |
5241 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
5242 | p1 = p + mcnt; | |
5243 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
505bde11 | 5244 | DEBUG_PRINT3 (" Setting %p to %d.\n", p1, mcnt); |
fa9a63c5 | 5245 | STORE_NUMBER (p1, mcnt); |
25fe55af RS |
5246 | break; |
5247 | } | |
9121ca40 KH |
5248 | |
5249 | case wordbound: | |
66f0296e SM |
5250 | case notwordbound: |
5251 | not = (re_opcode_t) *(p - 1) == notwordbound; | |
5252 | DEBUG_PRINT2 ("EXECUTING %swordbound.\n", not?"not":""); | |
fa9a63c5 | 5253 | |
99633e97 | 5254 | /* We SUCCEED (or FAIL) in one of the following cases: */ |
9121ca40 | 5255 | |
b18215fc | 5256 | /* Case 1: D is at the beginning or the end of string. */ |
9121ca40 | 5257 | if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d)) |
66f0296e | 5258 | not = !not; |
b18215fc RS |
5259 | else |
5260 | { | |
5261 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5262 | is the character at D, and S2 is the syntax of C2. */ | |
5263 | int c1, c2, s1, s2; | |
b18215fc | 5264 | #ifdef emacs |
2d1675e4 SM |
5265 | int offset = PTR_TO_OFFSET (d - 1); |
5266 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (offset); | |
5d967c7a | 5267 | UPDATE_SYNTAX_TABLE (charpos); |
25fe55af | 5268 | #endif |
66f0296e | 5269 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); |
b18215fc RS |
5270 | s1 = SYNTAX (c1); |
5271 | #ifdef emacs | |
5d967c7a | 5272 | UPDATE_SYNTAX_TABLE_FORWARD (charpos + 1); |
25fe55af | 5273 | #endif |
f1ad044f | 5274 | PREFETCH_NOLIMIT (); |
2d1675e4 | 5275 | c2 = RE_STRING_CHAR (d, dend - d); |
b18215fc RS |
5276 | s2 = SYNTAX (c2); |
5277 | ||
5278 | if (/* Case 2: Only one of S1 and S2 is Sword. */ | |
5279 | ((s1 == Sword) != (s2 == Sword)) | |
5280 | /* Case 3: Both of S1 and S2 are Sword, and macro | |
25fe55af | 5281 | WORD_BOUNDARY_P (C1, C2) returns nonzero. */ |
b18215fc | 5282 | || ((s1 == Sword) && WORD_BOUNDARY_P (c1, c2))) |
66f0296e SM |
5283 | not = !not; |
5284 | } | |
5285 | if (not) | |
9121ca40 | 5286 | break; |
b18215fc | 5287 | else |
9121ca40 | 5288 | goto fail; |
fa9a63c5 RM |
5289 | |
5290 | case wordbeg: | |
25fe55af | 5291 | DEBUG_PRINT1 ("EXECUTING wordbeg.\n"); |
fa9a63c5 | 5292 | |
b18215fc RS |
5293 | /* We FAIL in one of the following cases: */ |
5294 | ||
25fe55af | 5295 | /* Case 1: D is at the end of string. */ |
b18215fc | 5296 | if (AT_STRINGS_END (d)) |
99633e97 | 5297 | goto fail; |
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; | |
fa9a63c5 | 5303 | #ifdef emacs |
2d1675e4 SM |
5304 | int offset = PTR_TO_OFFSET (d); |
5305 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (offset); | |
92432794 | 5306 | UPDATE_SYNTAX_TABLE (charpos); |
25fe55af | 5307 | #endif |
99633e97 | 5308 | PREFETCH (); |
2d1675e4 | 5309 | c2 = RE_STRING_CHAR (d, dend - d); |
b18215fc | 5310 | s2 = SYNTAX (c2); |
25fe55af | 5311 | |
b18215fc RS |
5312 | /* Case 2: S2 is not Sword. */ |
5313 | if (s2 != Sword) | |
5314 | goto fail; | |
5315 | ||
5316 | /* Case 3: D is not at the beginning of string ... */ | |
5317 | if (!AT_STRINGS_BEG (d)) | |
5318 | { | |
5319 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); | |
5320 | #ifdef emacs | |
5d967c7a | 5321 | UPDATE_SYNTAX_TABLE_BACKWARD (charpos - 1); |
25fe55af | 5322 | #endif |
b18215fc RS |
5323 | s1 = SYNTAX (c1); |
5324 | ||
5325 | /* ... and S1 is Sword, and WORD_BOUNDARY_P (C1, C2) | |
25fe55af | 5326 | returns 0. */ |
b18215fc RS |
5327 | if ((s1 == Sword) && !WORD_BOUNDARY_P (c1, c2)) |
5328 | goto fail; | |
5329 | } | |
5330 | } | |
e318085a RS |
5331 | break; |
5332 | ||
b18215fc | 5333 | case wordend: |
25fe55af | 5334 | DEBUG_PRINT1 ("EXECUTING wordend.\n"); |
b18215fc RS |
5335 | |
5336 | /* We FAIL in one of the following cases: */ | |
5337 | ||
5338 | /* Case 1: D is at the beginning of string. */ | |
5339 | if (AT_STRINGS_BEG (d)) | |
e318085a | 5340 | goto fail; |
b18215fc RS |
5341 | else |
5342 | { | |
5343 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5344 | is the character at D, and S2 is the syntax of C2. */ | |
5345 | int c1, c2, s1, s2; | |
5d967c7a | 5346 | #ifdef emacs |
2d1675e4 SM |
5347 | int offset = PTR_TO_OFFSET (d) - 1; |
5348 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (offset); | |
92432794 | 5349 | UPDATE_SYNTAX_TABLE (charpos); |
5d967c7a | 5350 | #endif |
99633e97 | 5351 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); |
b18215fc RS |
5352 | s1 = SYNTAX (c1); |
5353 | ||
5354 | /* Case 2: S1 is not Sword. */ | |
5355 | if (s1 != Sword) | |
5356 | goto fail; | |
5357 | ||
5358 | /* Case 3: D is not at the end of string ... */ | |
5359 | if (!AT_STRINGS_END (d)) | |
5360 | { | |
f1ad044f | 5361 | PREFETCH_NOLIMIT (); |
2d1675e4 | 5362 | c2 = RE_STRING_CHAR (d, dend - d); |
5d967c7a RS |
5363 | #ifdef emacs |
5364 | UPDATE_SYNTAX_TABLE_FORWARD (charpos); | |
5365 | #endif | |
b18215fc RS |
5366 | s2 = SYNTAX (c2); |
5367 | ||
5368 | /* ... and S2 is Sword, and WORD_BOUNDARY_P (C1, C2) | |
25fe55af | 5369 | returns 0. */ |
b18215fc | 5370 | if ((s2 == Sword) && !WORD_BOUNDARY_P (c1, c2)) |
25fe55af | 5371 | goto fail; |
b18215fc RS |
5372 | } |
5373 | } | |
e318085a RS |
5374 | break; |
5375 | ||
fa9a63c5 | 5376 | case syntaxspec: |
1fb352e0 SM |
5377 | case notsyntaxspec: |
5378 | not = (re_opcode_t) *(p - 1) == notsyntaxspec; | |
fa9a63c5 | 5379 | mcnt = *p++; |
1fb352e0 | 5380 | DEBUG_PRINT3 ("EXECUTING %ssyntaxspec %d.\n", not?"not":"", mcnt); |
fa9a63c5 | 5381 | PREFETCH (); |
b18215fc RS |
5382 | #ifdef emacs |
5383 | { | |
2d1675e4 SM |
5384 | int offset = PTR_TO_OFFSET (d); |
5385 | int pos1 = SYNTAX_TABLE_BYTE_TO_CHAR (offset); | |
b18215fc RS |
5386 | UPDATE_SYNTAX_TABLE (pos1); |
5387 | } | |
25fe55af | 5388 | #endif |
b18215fc RS |
5389 | { |
5390 | int c, len; | |
5391 | ||
2d1675e4 | 5392 | c = RE_STRING_CHAR_AND_LENGTH (d, dend - d, len); |
b18215fc | 5393 | |
990b2375 | 5394 | if ((SYNTAX (c) != (enum syntaxcode) mcnt) ^ not) |
1fb352e0 | 5395 | goto fail; |
b18215fc RS |
5396 | d += len; |
5397 | } | |
fa9a63c5 RM |
5398 | break; |
5399 | ||
b18215fc | 5400 | #ifdef emacs |
1fb352e0 SM |
5401 | case before_dot: |
5402 | DEBUG_PRINT1 ("EXECUTING before_dot.\n"); | |
5403 | if (PTR_BYTE_POS (d) >= PT_BYTE) | |
fa9a63c5 | 5404 | goto fail; |
b18215fc RS |
5405 | break; |
5406 | ||
1fb352e0 SM |
5407 | case at_dot: |
5408 | DEBUG_PRINT1 ("EXECUTING at_dot.\n"); | |
5409 | if (PTR_BYTE_POS (d) != PT_BYTE) | |
5410 | goto fail; | |
5411 | break; | |
b18215fc | 5412 | |
1fb352e0 SM |
5413 | case after_dot: |
5414 | DEBUG_PRINT1 ("EXECUTING after_dot.\n"); | |
5415 | if (PTR_BYTE_POS (d) <= PT_BYTE) | |
5416 | goto fail; | |
e318085a | 5417 | break; |
fa9a63c5 | 5418 | |
1fb352e0 | 5419 | case categoryspec: |
b18215fc | 5420 | case notcategoryspec: |
1fb352e0 | 5421 | not = (re_opcode_t) *(p - 1) == notcategoryspec; |
b18215fc | 5422 | mcnt = *p++; |
1fb352e0 | 5423 | DEBUG_PRINT3 ("EXECUTING %scategoryspec %d.\n", not?"not":"", mcnt); |
b18215fc RS |
5424 | PREFETCH (); |
5425 | { | |
5426 | int c, len; | |
2d1675e4 | 5427 | c = RE_STRING_CHAR_AND_LENGTH (d, dend - d, len); |
b18215fc | 5428 | |
1fb352e0 | 5429 | if ((!CHAR_HAS_CATEGORY (c, mcnt)) ^ not) |
b18215fc RS |
5430 | goto fail; |
5431 | d += len; | |
5432 | } | |
fa9a63c5 | 5433 | break; |
5e69f11e | 5434 | |
1fb352e0 | 5435 | #endif /* emacs */ |
5e69f11e | 5436 | |
b18215fc RS |
5437 | default: |
5438 | abort (); | |
fa9a63c5 | 5439 | } |
b18215fc | 5440 | continue; /* Successfully executed one pattern command; keep going. */ |
fa9a63c5 RM |
5441 | |
5442 | ||
5443 | /* We goto here if a matching operation fails. */ | |
5444 | fail: | |
27c3b45d | 5445 | QUIT; |
fa9a63c5 | 5446 | if (!FAIL_STACK_EMPTY ()) |
505bde11 | 5447 | { |
66f0296e | 5448 | re_char *str; |
505bde11 SM |
5449 | unsigned char *pat; |
5450 | /* A restart point is known. Restore to that state. */ | |
b18215fc | 5451 | DEBUG_PRINT1 ("\nFAIL:\n"); |
505bde11 SM |
5452 | POP_FAILURE_POINT (str, pat); |
5453 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *pat++)) | |
5454 | { | |
5455 | case on_failure_keep_string_jump: | |
5456 | assert (str == NULL); | |
5457 | goto continue_failure_jump; | |
5458 | ||
0683b6fa SM |
5459 | case on_failure_jump_nastyloop: |
5460 | assert ((re_opcode_t)pat[-2] == no_op); | |
5461 | PUSH_FAILURE_POINT (pat - 2, str); | |
5462 | /* Fallthrough */ | |
5463 | ||
505bde11 SM |
5464 | case on_failure_jump_loop: |
5465 | case on_failure_jump: | |
5466 | case succeed_n: | |
5467 | d = str; | |
5468 | continue_failure_jump: | |
5469 | EXTRACT_NUMBER_AND_INCR (mcnt, pat); | |
5470 | p = pat + mcnt; | |
5471 | break; | |
b18215fc | 5472 | |
0683b6fa SM |
5473 | case no_op: |
5474 | /* A special frame used for nastyloops. */ | |
5475 | goto fail; | |
5476 | ||
505bde11 SM |
5477 | default: |
5478 | abort(); | |
5479 | } | |
fa9a63c5 | 5480 | |
505bde11 | 5481 | assert (p >= bufp->buffer && p <= pend); |
b18215fc RS |
5482 | |
5483 | if (d >= string1 && d <= end1) | |
fa9a63c5 | 5484 | dend = end_match_1; |
b18215fc | 5485 | } |
fa9a63c5 | 5486 | else |
b18215fc | 5487 | break; /* Matching at this starting point really fails. */ |
fa9a63c5 RM |
5488 | } /* for (;;) */ |
5489 | ||
5490 | if (best_regs_set) | |
5491 | goto restore_best_regs; | |
5492 | ||
5493 | FREE_VARIABLES (); | |
5494 | ||
b18215fc | 5495 | return -1; /* Failure to match. */ |
fa9a63c5 RM |
5496 | } /* re_match_2 */ |
5497 | \f | |
5498 | /* Subroutine definitions for re_match_2. */ | |
5499 | ||
fa9a63c5 RM |
5500 | /* Return zero if TRANSLATE[S1] and TRANSLATE[S2] are identical for LEN |
5501 | bytes; nonzero otherwise. */ | |
5e69f11e | 5502 | |
fa9a63c5 | 5503 | static int |
2d1675e4 SM |
5504 | bcmp_translate (s1, s2, len, translate, multibyte) |
5505 | re_char *s1, *s2; | |
fa9a63c5 | 5506 | register int len; |
6676cb1c | 5507 | RE_TRANSLATE_TYPE translate; |
2d1675e4 | 5508 | const int multibyte; |
fa9a63c5 | 5509 | { |
2d1675e4 SM |
5510 | register re_char *p1 = s1, *p2 = s2; |
5511 | re_char *p1_end = s1 + len; | |
5512 | re_char *p2_end = s2 + len; | |
e934739e RS |
5513 | |
5514 | while (p1 != p1_end && p2 != p2_end) | |
fa9a63c5 | 5515 | { |
e934739e RS |
5516 | int p1_charlen, p2_charlen; |
5517 | int p1_ch, p2_ch; | |
5518 | ||
2d1675e4 SM |
5519 | p1_ch = RE_STRING_CHAR_AND_LENGTH (p1, p1_end - p1, p1_charlen); |
5520 | p2_ch = RE_STRING_CHAR_AND_LENGTH (p2, p2_end - p2, p2_charlen); | |
e934739e RS |
5521 | |
5522 | if (RE_TRANSLATE (translate, p1_ch) | |
5523 | != RE_TRANSLATE (translate, p2_ch)) | |
bc192b5b | 5524 | return 1; |
e934739e RS |
5525 | |
5526 | p1 += p1_charlen, p2 += p2_charlen; | |
fa9a63c5 | 5527 | } |
e934739e RS |
5528 | |
5529 | if (p1 != p1_end || p2 != p2_end) | |
5530 | return 1; | |
5531 | ||
fa9a63c5 RM |
5532 | return 0; |
5533 | } | |
5534 | \f | |
5535 | /* Entry points for GNU code. */ | |
5536 | ||
5537 | /* re_compile_pattern is the GNU regular expression compiler: it | |
5538 | compiles PATTERN (of length SIZE) and puts the result in BUFP. | |
5539 | Returns 0 if the pattern was valid, otherwise an error string. | |
5e69f11e | 5540 | |
fa9a63c5 RM |
5541 | Assumes the `allocated' (and perhaps `buffer') and `translate' fields |
5542 | are set in BUFP on entry. | |
5e69f11e | 5543 | |
b18215fc | 5544 | We call regex_compile to do the actual compilation. */ |
fa9a63c5 RM |
5545 | |
5546 | const char * | |
5547 | re_compile_pattern (pattern, length, bufp) | |
5548 | const char *pattern; | |
5549 | int length; | |
5550 | struct re_pattern_buffer *bufp; | |
5551 | { | |
5552 | reg_errcode_t ret; | |
5e69f11e | 5553 | |
fa9a63c5 RM |
5554 | /* GNU code is written to assume at least RE_NREGS registers will be set |
5555 | (and at least one extra will be -1). */ | |
5556 | bufp->regs_allocated = REGS_UNALLOCATED; | |
5e69f11e | 5557 | |
fa9a63c5 RM |
5558 | /* And GNU code determines whether or not to get register information |
5559 | by passing null for the REGS argument to re_match, etc., not by | |
5560 | setting no_sub. */ | |
5561 | bufp->no_sub = 0; | |
5e69f11e | 5562 | |
b18215fc | 5563 | /* Match anchors at newline. */ |
fa9a63c5 | 5564 | bufp->newline_anchor = 1; |
5e69f11e | 5565 | |
fa9a63c5 RM |
5566 | ret = regex_compile (pattern, length, re_syntax_options, bufp); |
5567 | ||
5568 | if (!ret) | |
5569 | return NULL; | |
5570 | return gettext (re_error_msgid[(int) ret]); | |
5e69f11e | 5571 | } |
fa9a63c5 | 5572 | \f |
b18215fc RS |
5573 | /* Entry points compatible with 4.2 BSD regex library. We don't define |
5574 | them unless specifically requested. */ | |
fa9a63c5 | 5575 | |
0c085854 | 5576 | #if defined (_REGEX_RE_COMP) || defined (_LIBC) |
fa9a63c5 RM |
5577 | |
5578 | /* BSD has one and only one pattern buffer. */ | |
5579 | static struct re_pattern_buffer re_comp_buf; | |
5580 | ||
5581 | char * | |
48afdd44 RM |
5582 | #ifdef _LIBC |
5583 | /* Make these definitions weak in libc, so POSIX programs can redefine | |
5584 | these names if they don't use our functions, and still use | |
5585 | regcomp/regexec below without link errors. */ | |
5586 | weak_function | |
5587 | #endif | |
fa9a63c5 RM |
5588 | re_comp (s) |
5589 | const char *s; | |
5590 | { | |
5591 | reg_errcode_t ret; | |
5e69f11e | 5592 | |
fa9a63c5 RM |
5593 | if (!s) |
5594 | { | |
5595 | if (!re_comp_buf.buffer) | |
5596 | return gettext ("No previous regular expression"); | |
5597 | return 0; | |
5598 | } | |
5599 | ||
5600 | if (!re_comp_buf.buffer) | |
5601 | { | |
5602 | re_comp_buf.buffer = (unsigned char *) malloc (200); | |
5603 | if (re_comp_buf.buffer == NULL) | |
b18215fc | 5604 | return gettext (re_error_msgid[(int) REG_ESPACE]); |
fa9a63c5 RM |
5605 | re_comp_buf.allocated = 200; |
5606 | ||
5607 | re_comp_buf.fastmap = (char *) malloc (1 << BYTEWIDTH); | |
5608 | if (re_comp_buf.fastmap == NULL) | |
5609 | return gettext (re_error_msgid[(int) REG_ESPACE]); | |
5610 | } | |
5611 | ||
5612 | /* Since `re_exec' always passes NULL for the `regs' argument, we | |
5613 | don't need to initialize the pattern buffer fields which affect it. */ | |
5614 | ||
b18215fc | 5615 | /* Match anchors at newlines. */ |
fa9a63c5 RM |
5616 | re_comp_buf.newline_anchor = 1; |
5617 | ||
5618 | ret = regex_compile (s, strlen (s), re_syntax_options, &re_comp_buf); | |
5e69f11e | 5619 | |
fa9a63c5 RM |
5620 | if (!ret) |
5621 | return NULL; | |
5622 | ||
5623 | /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */ | |
5624 | return (char *) gettext (re_error_msgid[(int) ret]); | |
5625 | } | |
5626 | ||
5627 | ||
5628 | int | |
48afdd44 RM |
5629 | #ifdef _LIBC |
5630 | weak_function | |
5631 | #endif | |
fa9a63c5 RM |
5632 | re_exec (s) |
5633 | const char *s; | |
5634 | { | |
5635 | const int len = strlen (s); | |
5636 | return | |
5637 | 0 <= re_search (&re_comp_buf, s, len, 0, len, (struct re_registers *) 0); | |
5638 | } | |
5639 | #endif /* _REGEX_RE_COMP */ | |
5640 | \f | |
5641 | /* POSIX.2 functions. Don't define these for Emacs. */ | |
5642 | ||
5643 | #ifndef emacs | |
5644 | ||
5645 | /* regcomp takes a regular expression as a string and compiles it. | |
5646 | ||
b18215fc | 5647 | PREG is a regex_t *. We do not expect any fields to be initialized, |
fa9a63c5 RM |
5648 | since POSIX says we shouldn't. Thus, we set |
5649 | ||
5650 | `buffer' to the compiled pattern; | |
5651 | `used' to the length of the compiled pattern; | |
5652 | `syntax' to RE_SYNTAX_POSIX_EXTENDED if the | |
5653 | REG_EXTENDED bit in CFLAGS is set; otherwise, to | |
5654 | RE_SYNTAX_POSIX_BASIC; | |
5655 | `newline_anchor' to REG_NEWLINE being set in CFLAGS; | |
5656 | `fastmap' and `fastmap_accurate' to zero; | |
5657 | `re_nsub' to the number of subexpressions in PATTERN. | |
5658 | ||
5659 | PATTERN is the address of the pattern string. | |
5660 | ||
5661 | CFLAGS is a series of bits which affect compilation. | |
5662 | ||
5663 | If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we | |
5664 | use POSIX basic syntax. | |
5665 | ||
5666 | If REG_NEWLINE is set, then . and [^...] don't match newline. | |
5667 | Also, regexec will try a match beginning after every newline. | |
5668 | ||
5669 | If REG_ICASE is set, then we considers upper- and lowercase | |
5670 | versions of letters to be equivalent when matching. | |
5671 | ||
5672 | If REG_NOSUB is set, then when PREG is passed to regexec, that | |
5673 | routine will report only success or failure, and nothing about the | |
5674 | registers. | |
5675 | ||
b18215fc | 5676 | It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for |
fa9a63c5 RM |
5677 | the return codes and their meanings.) */ |
5678 | ||
5679 | int | |
5680 | regcomp (preg, pattern, cflags) | |
5681 | regex_t *preg; | |
5e69f11e | 5682 | const char *pattern; |
fa9a63c5 RM |
5683 | int cflags; |
5684 | { | |
5685 | reg_errcode_t ret; | |
5686 | unsigned syntax | |
5687 | = (cflags & REG_EXTENDED) ? | |
5688 | RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC; | |
5689 | ||
5690 | /* regex_compile will allocate the space for the compiled pattern. */ | |
5691 | preg->buffer = 0; | |
5692 | preg->allocated = 0; | |
5693 | preg->used = 0; | |
5e69f11e | 5694 | |
fa9a63c5 RM |
5695 | /* Don't bother to use a fastmap when searching. This simplifies the |
5696 | REG_NEWLINE case: if we used a fastmap, we'd have to put all the | |
5697 | characters after newlines into the fastmap. This way, we just try | |
5698 | every character. */ | |
5699 | preg->fastmap = 0; | |
5e69f11e | 5700 | |
fa9a63c5 RM |
5701 | if (cflags & REG_ICASE) |
5702 | { | |
5703 | unsigned i; | |
5e69f11e | 5704 | |
6676cb1c RS |
5705 | preg->translate |
5706 | = (RE_TRANSLATE_TYPE) malloc (CHAR_SET_SIZE | |
5707 | * sizeof (*(RE_TRANSLATE_TYPE)0)); | |
fa9a63c5 | 5708 | if (preg->translate == NULL) |
b18215fc | 5709 | return (int) REG_ESPACE; |
fa9a63c5 RM |
5710 | |
5711 | /* Map uppercase characters to corresponding lowercase ones. */ | |
5712 | for (i = 0; i < CHAR_SET_SIZE; i++) | |
b18215fc | 5713 | preg->translate[i] = ISUPPER (i) ? tolower (i) : i; |
fa9a63c5 RM |
5714 | } |
5715 | else | |
5716 | preg->translate = NULL; | |
5717 | ||
5718 | /* If REG_NEWLINE is set, newlines are treated differently. */ | |
5719 | if (cflags & REG_NEWLINE) | |
5720 | { /* REG_NEWLINE implies neither . nor [^...] match newline. */ | |
5721 | syntax &= ~RE_DOT_NEWLINE; | |
5722 | syntax |= RE_HAT_LISTS_NOT_NEWLINE; | |
b18215fc | 5723 | /* It also changes the matching behavior. */ |
fa9a63c5 RM |
5724 | preg->newline_anchor = 1; |
5725 | } | |
5726 | else | |
5727 | preg->newline_anchor = 0; | |
5728 | ||
5729 | preg->no_sub = !!(cflags & REG_NOSUB); | |
5730 | ||
5e69f11e | 5731 | /* POSIX says a null character in the pattern terminates it, so we |
fa9a63c5 RM |
5732 | can use strlen here in compiling the pattern. */ |
5733 | ret = regex_compile (pattern, strlen (pattern), syntax, preg); | |
5e69f11e | 5734 | |
fa9a63c5 RM |
5735 | /* POSIX doesn't distinguish between an unmatched open-group and an |
5736 | unmatched close-group: both are REG_EPAREN. */ | |
5737 | if (ret == REG_ERPAREN) ret = REG_EPAREN; | |
5e69f11e | 5738 | |
fa9a63c5 RM |
5739 | return (int) ret; |
5740 | } | |
5741 | ||
5742 | ||
5743 | /* regexec searches for a given pattern, specified by PREG, in the | |
5744 | string STRING. | |
5e69f11e | 5745 | |
fa9a63c5 | 5746 | If NMATCH is zero or REG_NOSUB was set in the cflags argument to |
b18215fc | 5747 | `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at |
fa9a63c5 RM |
5748 | least NMATCH elements, and we set them to the offsets of the |
5749 | corresponding matched substrings. | |
5e69f11e | 5750 | |
fa9a63c5 RM |
5751 | EFLAGS specifies `execution flags' which affect matching: if |
5752 | REG_NOTBOL is set, then ^ does not match at the beginning of the | |
5753 | string; if REG_NOTEOL is set, then $ does not match at the end. | |
5e69f11e | 5754 | |
fa9a63c5 RM |
5755 | We return 0 if we find a match and REG_NOMATCH if not. */ |
5756 | ||
5757 | int | |
5758 | regexec (preg, string, nmatch, pmatch, eflags) | |
5759 | const regex_t *preg; | |
5e69f11e RM |
5760 | const char *string; |
5761 | size_t nmatch; | |
5762 | regmatch_t pmatch[]; | |
fa9a63c5 RM |
5763 | int eflags; |
5764 | { | |
5765 | int ret; | |
5766 | struct re_registers regs; | |
5767 | regex_t private_preg; | |
5768 | int len = strlen (string); | |
5769 | boolean want_reg_info = !preg->no_sub && nmatch > 0; | |
5770 | ||
5771 | private_preg = *preg; | |
5e69f11e | 5772 | |
fa9a63c5 RM |
5773 | private_preg.not_bol = !!(eflags & REG_NOTBOL); |
5774 | private_preg.not_eol = !!(eflags & REG_NOTEOL); | |
5e69f11e | 5775 | |
fa9a63c5 RM |
5776 | /* The user has told us exactly how many registers to return |
5777 | information about, via `nmatch'. We have to pass that on to the | |
b18215fc | 5778 | matching routines. */ |
fa9a63c5 | 5779 | private_preg.regs_allocated = REGS_FIXED; |
5e69f11e | 5780 | |
fa9a63c5 RM |
5781 | if (want_reg_info) |
5782 | { | |
5783 | regs.num_regs = nmatch; | |
5784 | regs.start = TALLOC (nmatch, regoff_t); | |
5785 | regs.end = TALLOC (nmatch, regoff_t); | |
5786 | if (regs.start == NULL || regs.end == NULL) | |
b18215fc | 5787 | return (int) REG_NOMATCH; |
fa9a63c5 RM |
5788 | } |
5789 | ||
5790 | /* Perform the searching operation. */ | |
5791 | ret = re_search (&private_preg, string, len, | |
b18215fc RS |
5792 | /* start: */ 0, /* range: */ len, |
5793 | want_reg_info ? ®s : (struct re_registers *) 0); | |
5e69f11e | 5794 | |
fa9a63c5 RM |
5795 | /* Copy the register information to the POSIX structure. */ |
5796 | if (want_reg_info) | |
5797 | { | |
5798 | if (ret >= 0) | |
b18215fc RS |
5799 | { |
5800 | unsigned r; | |
fa9a63c5 | 5801 | |
b18215fc RS |
5802 | for (r = 0; r < nmatch; r++) |
5803 | { | |
5804 | pmatch[r].rm_so = regs.start[r]; | |
5805 | pmatch[r].rm_eo = regs.end[r]; | |
5806 | } | |
5807 | } | |
fa9a63c5 | 5808 | |
b18215fc | 5809 | /* If we needed the temporary register info, free the space now. */ |
fa9a63c5 RM |
5810 | free (regs.start); |
5811 | free (regs.end); | |
5812 | } | |
5813 | ||
5814 | /* We want zero return to mean success, unlike `re_search'. */ | |
5815 | return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH; | |
5816 | } | |
5817 | ||
5818 | ||
5819 | /* Returns a message corresponding to an error code, ERRCODE, returned | |
5820 | from either regcomp or regexec. We don't use PREG here. */ | |
5821 | ||
5822 | size_t | |
5823 | regerror (errcode, preg, errbuf, errbuf_size) | |
5824 | int errcode; | |
5825 | const regex_t *preg; | |
5826 | char *errbuf; | |
5827 | size_t errbuf_size; | |
5828 | { | |
5829 | const char *msg; | |
5830 | size_t msg_size; | |
5831 | ||
5832 | if (errcode < 0 | |
5833 | || errcode >= (sizeof (re_error_msgid) / sizeof (re_error_msgid[0]))) | |
5e69f11e | 5834 | /* Only error codes returned by the rest of the code should be passed |
b18215fc | 5835 | to this routine. If we are given anything else, or if other regex |
fa9a63c5 RM |
5836 | code generates an invalid error code, then the program has a bug. |
5837 | Dump core so we can fix it. */ | |
5838 | abort (); | |
5839 | ||
5840 | msg = gettext (re_error_msgid[errcode]); | |
5841 | ||
5842 | msg_size = strlen (msg) + 1; /* Includes the null. */ | |
5e69f11e | 5843 | |
fa9a63c5 RM |
5844 | if (errbuf_size != 0) |
5845 | { | |
5846 | if (msg_size > errbuf_size) | |
b18215fc RS |
5847 | { |
5848 | strncpy (errbuf, msg, errbuf_size - 1); | |
5849 | errbuf[errbuf_size - 1] = 0; | |
5850 | } | |
fa9a63c5 | 5851 | else |
b18215fc | 5852 | strcpy (errbuf, msg); |
fa9a63c5 RM |
5853 | } |
5854 | ||
5855 | return msg_size; | |
5856 | } | |
5857 | ||
5858 | ||
5859 | /* Free dynamically allocated space used by PREG. */ | |
5860 | ||
5861 | void | |
5862 | regfree (preg) | |
5863 | regex_t *preg; | |
5864 | { | |
5865 | if (preg->buffer != NULL) | |
5866 | free (preg->buffer); | |
5867 | preg->buffer = NULL; | |
5e69f11e | 5868 | |
fa9a63c5 RM |
5869 | preg->allocated = 0; |
5870 | preg->used = 0; | |
5871 | ||
5872 | if (preg->fastmap != NULL) | |
5873 | free (preg->fastmap); | |
5874 | preg->fastmap = NULL; | |
5875 | preg->fastmap_accurate = 0; | |
5876 | ||
5877 | if (preg->translate != NULL) | |
5878 | free (preg->translate); | |
5879 | preg->translate = NULL; | |
5880 | } | |
5881 | ||
5882 | #endif /* not emacs */ |