Commit | Line | Data |
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e318085a | 1 | /* Extended regular expression matching and search library, version |
0b32bf0e | 2 | 0.12. (Implements POSIX draft P1003.2/D11.2, except for some of the |
bc78d348 KB |
3 | internationalization features.) |
4 | ||
4bb91c68 | 5 | Copyright (C) 1993,94,95,96,97,98,99,2000 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 | |
6df42991 | 22 | /* TODO: |
505bde11 | 23 | - structure the opcode space into opcode+flag. |
dc1e502d | 24 | - merge with glibc's regex.[ch]. |
01618498 | 25 | - replace (succeed_n + jump_n + set_number_at) with something that doesn't |
6dcf2d0e SM |
26 | need to modify the compiled regexp so that re_match can be reentrant. |
27 | - get rid of on_failure_jump_smart by doing the optimization in re_comp | |
28 | rather than at run-time, so that re_match can be reentrant. | |
01618498 | 29 | */ |
505bde11 | 30 | |
fa9a63c5 | 31 | /* AIX requires this to be the first thing in the file. */ |
0b32bf0e | 32 | #if defined _AIX && !defined REGEX_MALLOC |
fa9a63c5 RM |
33 | #pragma alloca |
34 | #endif | |
35 | ||
fa9a63c5 | 36 | #ifdef HAVE_CONFIG_H |
0b32bf0e | 37 | # include <config.h> |
fa9a63c5 RM |
38 | #endif |
39 | ||
4bb91c68 SM |
40 | #if defined STDC_HEADERS && !defined emacs |
41 | # include <stddef.h> | |
42 | #else | |
43 | /* We need this for `regex.h', and perhaps for the Emacs include files. */ | |
44 | # include <sys/types.h> | |
45 | #endif | |
fa9a63c5 | 46 | |
14473664 SM |
47 | /* Whether to use ISO C Amendment 1 wide char functions. |
48 | Those should not be used for Emacs since it uses its own. */ | |
5e5388f6 GM |
49 | #if defined _LIBC |
50 | #define WIDE_CHAR_SUPPORT 1 | |
51 | #else | |
14473664 | 52 | #define WIDE_CHAR_SUPPORT \ |
5e5388f6 GM |
53 | (HAVE_WCTYPE_H && HAVE_WCHAR_H && HAVE_BTOWC && !emacs) |
54 | #endif | |
14473664 SM |
55 | |
56 | /* For platform which support the ISO C amendement 1 functionality we | |
57 | support user defined character classes. */ | |
a0ad02f7 | 58 | #if WIDE_CHAR_SUPPORT |
14473664 SM |
59 | /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>. */ |
60 | # include <wchar.h> | |
61 | # include <wctype.h> | |
62 | #endif | |
63 | ||
c0f9ea08 SM |
64 | #ifdef _LIBC |
65 | /* We have to keep the namespace clean. */ | |
66 | # define regfree(preg) __regfree (preg) | |
67 | # define regexec(pr, st, nm, pm, ef) __regexec (pr, st, nm, pm, ef) | |
68 | # define regcomp(preg, pattern, cflags) __regcomp (preg, pattern, cflags) | |
69 | # define regerror(errcode, preg, errbuf, errbuf_size) \ | |
70 | __regerror(errcode, preg, errbuf, errbuf_size) | |
71 | # define re_set_registers(bu, re, nu, st, en) \ | |
72 | __re_set_registers (bu, re, nu, st, en) | |
73 | # define re_match_2(bufp, string1, size1, string2, size2, pos, regs, stop) \ | |
74 | __re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop) | |
75 | # define re_match(bufp, string, size, pos, regs) \ | |
76 | __re_match (bufp, string, size, pos, regs) | |
77 | # define re_search(bufp, string, size, startpos, range, regs) \ | |
78 | __re_search (bufp, string, size, startpos, range, regs) | |
79 | # define re_compile_pattern(pattern, length, bufp) \ | |
80 | __re_compile_pattern (pattern, length, bufp) | |
81 | # define re_set_syntax(syntax) __re_set_syntax (syntax) | |
82 | # define re_search_2(bufp, st1, s1, st2, s2, startpos, range, regs, stop) \ | |
83 | __re_search_2 (bufp, st1, s1, st2, s2, startpos, range, regs, stop) | |
84 | # define re_compile_fastmap(bufp) __re_compile_fastmap (bufp) | |
85 | ||
14473664 SM |
86 | /* Make sure we call libc's function even if the user overrides them. */ |
87 | # define btowc __btowc | |
88 | # define iswctype __iswctype | |
89 | # define wctype __wctype | |
90 | ||
c0f9ea08 SM |
91 | # define WEAK_ALIAS(a,b) weak_alias (a, b) |
92 | ||
93 | /* We are also using some library internals. */ | |
94 | # include <locale/localeinfo.h> | |
95 | # include <locale/elem-hash.h> | |
96 | # include <langinfo.h> | |
97 | #else | |
98 | # define WEAK_ALIAS(a,b) | |
99 | #endif | |
100 | ||
4bb91c68 | 101 | /* This is for other GNU distributions with internationalized messages. */ |
0b32bf0e | 102 | #if HAVE_LIBINTL_H || defined _LIBC |
fa9a63c5 RM |
103 | # include <libintl.h> |
104 | #else | |
105 | # define gettext(msgid) (msgid) | |
106 | #endif | |
107 | ||
5e69f11e RM |
108 | #ifndef gettext_noop |
109 | /* This define is so xgettext can find the internationalizable | |
110 | strings. */ | |
0b32bf0e | 111 | # define gettext_noop(String) String |
5e69f11e RM |
112 | #endif |
113 | ||
fa9a63c5 RM |
114 | /* The `emacs' switch turns on certain matching commands |
115 | that make sense only in Emacs. */ | |
116 | #ifdef emacs | |
117 | ||
0b32bf0e SM |
118 | # include "lisp.h" |
119 | # include "buffer.h" | |
b18215fc RS |
120 | |
121 | /* Make syntax table lookup grant data in gl_state. */ | |
0b32bf0e | 122 | # define SYNTAX_ENTRY_VIA_PROPERTY |
b18215fc | 123 | |
0b32bf0e SM |
124 | # include "syntax.h" |
125 | # include "charset.h" | |
126 | # include "category.h" | |
fa9a63c5 | 127 | |
7689ef0b EZ |
128 | # ifdef malloc |
129 | # undef malloc | |
130 | # endif | |
0b32bf0e | 131 | # define malloc xmalloc |
7689ef0b EZ |
132 | # ifdef realloc |
133 | # undef realloc | |
134 | # endif | |
0b32bf0e | 135 | # define realloc xrealloc |
7689ef0b EZ |
136 | # ifdef free |
137 | # undef free | |
138 | # endif | |
0b32bf0e | 139 | # define free xfree |
9abbd165 | 140 | |
0b32bf0e SM |
141 | /* Converts the pointer to the char to BEG-based offset from the start. */ |
142 | # define PTR_TO_OFFSET(d) POS_AS_IN_BUFFER (POINTER_TO_OFFSET (d)) | |
143 | # define POS_AS_IN_BUFFER(p) ((p) + (NILP (re_match_object) || BUFFERP (re_match_object))) | |
144 | ||
145 | # define RE_MULTIBYTE_P(bufp) ((bufp)->multibyte) | |
146 | # define RE_STRING_CHAR(p, s) \ | |
4e8a9132 | 147 | (multibyte ? (STRING_CHAR (p, s)) : (*(p))) |
0b32bf0e | 148 | # define RE_STRING_CHAR_AND_LENGTH(p, s, len) \ |
2d1675e4 SM |
149 | (multibyte ? (STRING_CHAR_AND_LENGTH (p, s, len)) : ((len) = 1, *(p))) |
150 | ||
151 | /* Set C a (possibly multibyte) character before P. P points into a | |
152 | string which is the virtual concatenation of STR1 (which ends at | |
153 | END1) or STR2 (which ends at END2). */ | |
0b32bf0e | 154 | # define GET_CHAR_BEFORE_2(c, p, str1, end1, str2, end2) \ |
2d1675e4 SM |
155 | do { \ |
156 | if (multibyte) \ | |
157 | { \ | |
0b32bf0e SM |
158 | re_char *dtemp = (p) == (str2) ? (end1) : (p); \ |
159 | re_char *dlimit = ((p) > (str2) && (p) <= (end2)) ? (str2) : (str1); \ | |
70806df6 KH |
160 | re_char *d0 = dtemp; \ |
161 | PREV_CHAR_BOUNDARY (d0, dlimit); \ | |
162 | c = STRING_CHAR (d0, dtemp - d0); \ | |
2d1675e4 SM |
163 | } \ |
164 | else \ | |
165 | (c = ((p) == (str2) ? (end1) : (p))[-1]); \ | |
166 | } while (0) | |
167 | ||
4e8a9132 | 168 | |
fa9a63c5 RM |
169 | #else /* not emacs */ |
170 | ||
171 | /* If we are not linking with Emacs proper, | |
172 | we can't use the relocating allocator | |
173 | even if config.h says that we can. */ | |
0b32bf0e | 174 | # undef REL_ALLOC |
fa9a63c5 | 175 | |
0b32bf0e SM |
176 | # if defined STDC_HEADERS || defined _LIBC |
177 | # include <stdlib.h> | |
178 | # else | |
fa9a63c5 RM |
179 | char *malloc (); |
180 | char *realloc (); | |
0b32bf0e | 181 | # endif |
fa9a63c5 | 182 | |
9e4ecb26 | 183 | /* When used in Emacs's lib-src, we need to get bzero and bcopy somehow. |
4bb91c68 | 184 | If nothing else has been done, use the method below. */ |
0b32bf0e SM |
185 | # ifdef INHIBIT_STRING_HEADER |
186 | # if !(defined HAVE_BZERO && defined HAVE_BCOPY) | |
187 | # if !defined bzero && !defined bcopy | |
188 | # undef INHIBIT_STRING_HEADER | |
189 | # endif | |
190 | # endif | |
191 | # endif | |
9e4ecb26 | 192 | |
4bb91c68 | 193 | /* This is the normal way of making sure we have memcpy, memcmp and bzero. |
9e4ecb26 KH |
194 | This is used in most programs--a few other programs avoid this |
195 | by defining INHIBIT_STRING_HEADER. */ | |
0b32bf0e SM |
196 | # ifndef INHIBIT_STRING_HEADER |
197 | # if defined HAVE_STRING_H || defined STDC_HEADERS || defined _LIBC | |
198 | # include <string.h> | |
0b32bf0e | 199 | # ifndef bzero |
4bb91c68 SM |
200 | # ifndef _LIBC |
201 | # define bzero(s, n) (memset (s, '\0', n), (s)) | |
202 | # else | |
203 | # define bzero(s, n) __bzero (s, n) | |
204 | # endif | |
0b32bf0e SM |
205 | # endif |
206 | # else | |
207 | # include <strings.h> | |
4bb91c68 SM |
208 | # ifndef memcmp |
209 | # define memcmp(s1, s2, n) bcmp (s1, s2, n) | |
210 | # endif | |
211 | # ifndef memcpy | |
212 | # define memcpy(d, s, n) (bcopy (s, d, n), (d)) | |
213 | # endif | |
0b32bf0e SM |
214 | # endif |
215 | # endif | |
fa9a63c5 RM |
216 | |
217 | /* Define the syntax stuff for \<, \>, etc. */ | |
218 | ||
990b2375 SM |
219 | /* Sword must be nonzero for the wordchar pattern commands in re_match_2. */ |
220 | enum syntaxcode { Swhitespace = 0, Sword = 1 }; | |
fa9a63c5 | 221 | |
0b32bf0e SM |
222 | # ifdef SWITCH_ENUM_BUG |
223 | # define SWITCH_ENUM_CAST(x) ((int)(x)) | |
224 | # else | |
225 | # define SWITCH_ENUM_CAST(x) (x) | |
226 | # endif | |
fa9a63c5 | 227 | |
e934739e | 228 | /* Dummy macros for non-Emacs environments. */ |
0b32bf0e SM |
229 | # define BASE_LEADING_CODE_P(c) (0) |
230 | # define CHAR_CHARSET(c) 0 | |
231 | # define CHARSET_LEADING_CODE_BASE(c) 0 | |
232 | # define MAX_MULTIBYTE_LENGTH 1 | |
233 | # define RE_MULTIBYTE_P(x) 0 | |
234 | # define WORD_BOUNDARY_P(c1, c2) (0) | |
235 | # define CHAR_HEAD_P(p) (1) | |
236 | # define SINGLE_BYTE_CHAR_P(c) (1) | |
237 | # define SAME_CHARSET_P(c1, c2) (1) | |
238 | # define MULTIBYTE_FORM_LENGTH(p, s) (1) | |
70806df6 | 239 | # define PREV_CHAR_BOUNDARY(p, limit) ((p)--) |
0b32bf0e SM |
240 | # define STRING_CHAR(p, s) (*(p)) |
241 | # define RE_STRING_CHAR STRING_CHAR | |
242 | # define CHAR_STRING(c, s) (*(s) = (c), 1) | |
243 | # define STRING_CHAR_AND_LENGTH(p, s, actual_len) ((actual_len) = 1, *(p)) | |
244 | # define RE_STRING_CHAR_AND_LENGTH STRING_CHAR_AND_LENGTH | |
245 | # define GET_CHAR_BEFORE_2(c, p, str1, end1, str2, end2) \ | |
b18215fc | 246 | (c = ((p) == (str2) ? *((end1) - 1) : *((p) - 1))) |
0b32bf0e | 247 | # define MAKE_CHAR(charset, c1, c2) (c1) |
fa9a63c5 | 248 | #endif /* not emacs */ |
4e8a9132 SM |
249 | |
250 | #ifndef RE_TRANSLATE | |
0b32bf0e SM |
251 | # define RE_TRANSLATE(TBL, C) ((unsigned char)(TBL)[C]) |
252 | # define RE_TRANSLATE_P(TBL) (TBL) | |
4e8a9132 | 253 | #endif |
fa9a63c5 RM |
254 | \f |
255 | /* Get the interface, including the syntax bits. */ | |
256 | #include "regex.h" | |
257 | ||
f71b19b6 DL |
258 | /* isalpha etc. are used for the character classes. */ |
259 | #include <ctype.h> | |
fa9a63c5 | 260 | |
f71b19b6 | 261 | #ifdef emacs |
fa9a63c5 | 262 | |
f71b19b6 | 263 | /* 1 if C is an ASCII character. */ |
0b32bf0e | 264 | # define IS_REAL_ASCII(c) ((c) < 0200) |
fa9a63c5 | 265 | |
f71b19b6 | 266 | /* 1 if C is a unibyte character. */ |
0b32bf0e | 267 | # define ISUNIBYTE(c) (SINGLE_BYTE_CHAR_P ((c))) |
96cc36cc | 268 | |
f71b19b6 | 269 | /* The Emacs definitions should not be directly affected by locales. */ |
96cc36cc | 270 | |
f71b19b6 | 271 | /* In Emacs, these are only used for single-byte characters. */ |
0b32bf0e SM |
272 | # define ISDIGIT(c) ((c) >= '0' && (c) <= '9') |
273 | # define ISCNTRL(c) ((c) < ' ') | |
274 | # define ISXDIGIT(c) (((c) >= '0' && (c) <= '9') \ | |
f71b19b6 DL |
275 | || ((c) >= 'a' && (c) <= 'f') \ |
276 | || ((c) >= 'A' && (c) <= 'F')) | |
96cc36cc RS |
277 | |
278 | /* This is only used for single-byte characters. */ | |
0b32bf0e | 279 | # define ISBLANK(c) ((c) == ' ' || (c) == '\t') |
96cc36cc RS |
280 | |
281 | /* The rest must handle multibyte characters. */ | |
282 | ||
0b32bf0e | 283 | # define ISGRAPH(c) (SINGLE_BYTE_CHAR_P (c) \ |
f71b19b6 | 284 | ? (c) > ' ' && !((c) >= 0177 && (c) <= 0237) \ |
96cc36cc RS |
285 | : 1) |
286 | ||
14473664 | 287 | # define ISPRINT(c) (SINGLE_BYTE_CHAR_P (c) \ |
f71b19b6 | 288 | ? (c) >= ' ' && !((c) >= 0177 && (c) <= 0237) \ |
96cc36cc RS |
289 | : 1) |
290 | ||
0b32bf0e | 291 | # define ISALNUM(c) (IS_REAL_ASCII (c) \ |
f71b19b6 DL |
292 | ? (((c) >= 'a' && (c) <= 'z') \ |
293 | || ((c) >= 'A' && (c) <= 'Z') \ | |
294 | || ((c) >= '0' && (c) <= '9')) \ | |
96cc36cc RS |
295 | : SYNTAX (c) == Sword) |
296 | ||
0b32bf0e | 297 | # define ISALPHA(c) (IS_REAL_ASCII (c) \ |
f71b19b6 DL |
298 | ? (((c) >= 'a' && (c) <= 'z') \ |
299 | || ((c) >= 'A' && (c) <= 'Z')) \ | |
96cc36cc RS |
300 | : SYNTAX (c) == Sword) |
301 | ||
0b32bf0e | 302 | # define ISLOWER(c) (LOWERCASEP (c)) |
96cc36cc | 303 | |
0b32bf0e | 304 | # define ISPUNCT(c) (IS_REAL_ASCII (c) \ |
f71b19b6 DL |
305 | ? ((c) > ' ' && (c) < 0177 \ |
306 | && !(((c) >= 'a' && (c) <= 'z') \ | |
4bb91c68 SM |
307 | || ((c) >= 'A' && (c) <= 'Z') \ |
308 | || ((c) >= '0' && (c) <= '9'))) \ | |
96cc36cc RS |
309 | : SYNTAX (c) != Sword) |
310 | ||
0b32bf0e | 311 | # define ISSPACE(c) (SYNTAX (c) == Swhitespace) |
96cc36cc | 312 | |
0b32bf0e | 313 | # define ISUPPER(c) (UPPERCASEP (c)) |
96cc36cc | 314 | |
0b32bf0e | 315 | # define ISWORD(c) (SYNTAX (c) == Sword) |
96cc36cc RS |
316 | |
317 | #else /* not emacs */ | |
318 | ||
f71b19b6 DL |
319 | /* Jim Meyering writes: |
320 | ||
321 | "... Some ctype macros are valid only for character codes that | |
322 | isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when | |
323 | using /bin/cc or gcc but without giving an ansi option). So, all | |
4bb91c68 | 324 | ctype uses should be through macros like ISPRINT... If |
f71b19b6 DL |
325 | STDC_HEADERS is defined, then autoconf has verified that the ctype |
326 | macros don't need to be guarded with references to isascii. ... | |
327 | Defining isascii to 1 should let any compiler worth its salt | |
4bb91c68 SM |
328 | eliminate the && through constant folding." |
329 | Solaris defines some of these symbols so we must undefine them first. */ | |
f71b19b6 | 330 | |
4bb91c68 | 331 | # undef ISASCII |
0b32bf0e SM |
332 | # if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII) |
333 | # define ISASCII(c) 1 | |
334 | # else | |
335 | # define ISASCII(c) isascii(c) | |
336 | # endif | |
f71b19b6 DL |
337 | |
338 | /* 1 if C is an ASCII character. */ | |
0b32bf0e | 339 | # define IS_REAL_ASCII(c) ((c) < 0200) |
f71b19b6 DL |
340 | |
341 | /* This distinction is not meaningful, except in Emacs. */ | |
0b32bf0e SM |
342 | # define ISUNIBYTE(c) 1 |
343 | ||
344 | # ifdef isblank | |
345 | # define ISBLANK(c) (ISASCII (c) && isblank (c)) | |
346 | # else | |
347 | # define ISBLANK(c) ((c) == ' ' || (c) == '\t') | |
348 | # endif | |
349 | # ifdef isgraph | |
350 | # define ISGRAPH(c) (ISASCII (c) && isgraph (c)) | |
351 | # else | |
352 | # define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c)) | |
353 | # endif | |
354 | ||
4bb91c68 | 355 | # undef ISPRINT |
0b32bf0e SM |
356 | # define ISPRINT(c) (ISASCII (c) && isprint (c)) |
357 | # define ISDIGIT(c) (ISASCII (c) && isdigit (c)) | |
358 | # define ISALNUM(c) (ISASCII (c) && isalnum (c)) | |
359 | # define ISALPHA(c) (ISASCII (c) && isalpha (c)) | |
360 | # define ISCNTRL(c) (ISASCII (c) && iscntrl (c)) | |
361 | # define ISLOWER(c) (ISASCII (c) && islower (c)) | |
362 | # define ISPUNCT(c) (ISASCII (c) && ispunct (c)) | |
363 | # define ISSPACE(c) (ISASCII (c) && isspace (c)) | |
364 | # define ISUPPER(c) (ISASCII (c) && isupper (c)) | |
365 | # define ISXDIGIT(c) (ISASCII (c) && isxdigit (c)) | |
366 | ||
367 | # define ISWORD(c) ISALPHA(c) | |
368 | ||
4bb91c68 SM |
369 | # ifdef _tolower |
370 | # define TOLOWER(c) _tolower(c) | |
371 | # else | |
372 | # define TOLOWER(c) tolower(c) | |
373 | # endif | |
374 | ||
375 | /* How many characters in the character set. */ | |
376 | # define CHAR_SET_SIZE 256 | |
377 | ||
0b32bf0e | 378 | # ifdef SYNTAX_TABLE |
f71b19b6 | 379 | |
0b32bf0e | 380 | extern char *re_syntax_table; |
f71b19b6 | 381 | |
0b32bf0e SM |
382 | # else /* not SYNTAX_TABLE */ |
383 | ||
0b32bf0e SM |
384 | static char re_syntax_table[CHAR_SET_SIZE]; |
385 | ||
386 | static void | |
387 | init_syntax_once () | |
388 | { | |
389 | register int c; | |
390 | static int done = 0; | |
391 | ||
392 | if (done) | |
393 | return; | |
394 | ||
395 | bzero (re_syntax_table, sizeof re_syntax_table); | |
396 | ||
4bb91c68 SM |
397 | for (c = 0; c < CHAR_SET_SIZE; ++c) |
398 | if (ISALNUM (c)) | |
399 | re_syntax_table[c] = Sword; | |
fa9a63c5 | 400 | |
0b32bf0e | 401 | re_syntax_table['_'] = Sword; |
fa9a63c5 | 402 | |
0b32bf0e SM |
403 | done = 1; |
404 | } | |
405 | ||
406 | # endif /* not SYNTAX_TABLE */ | |
96cc36cc | 407 | |
4bb91c68 SM |
408 | # define SYNTAX(c) re_syntax_table[(c)] |
409 | ||
96cc36cc RS |
410 | #endif /* not emacs */ |
411 | \f | |
fa9a63c5 | 412 | #ifndef NULL |
0b32bf0e | 413 | # define NULL (void *)0 |
fa9a63c5 RM |
414 | #endif |
415 | ||
416 | /* We remove any previous definition of `SIGN_EXTEND_CHAR', | |
417 | since ours (we hope) works properly with all combinations of | |
418 | machines, compilers, `char' and `unsigned char' argument types. | |
4bb91c68 | 419 | (Per Bothner suggested the basic approach.) */ |
fa9a63c5 RM |
420 | #undef SIGN_EXTEND_CHAR |
421 | #if __STDC__ | |
0b32bf0e | 422 | # define SIGN_EXTEND_CHAR(c) ((signed char) (c)) |
fa9a63c5 RM |
423 | #else /* not __STDC__ */ |
424 | /* As in Harbison and Steele. */ | |
0b32bf0e | 425 | # define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128) |
fa9a63c5 RM |
426 | #endif |
427 | \f | |
428 | /* Should we use malloc or alloca? If REGEX_MALLOC is not defined, we | |
429 | use `alloca' instead of `malloc'. This is because using malloc in | |
430 | re_search* or re_match* could cause memory leaks when C-g is used in | |
431 | Emacs; also, malloc is slower and causes storage fragmentation. On | |
5e69f11e RM |
432 | the other hand, malloc is more portable, and easier to debug. |
433 | ||
fa9a63c5 RM |
434 | Because we sometimes use alloca, some routines have to be macros, |
435 | not functions -- `alloca'-allocated space disappears at the end of the | |
436 | function it is called in. */ | |
437 | ||
438 | #ifdef REGEX_MALLOC | |
439 | ||
0b32bf0e SM |
440 | # define REGEX_ALLOCATE malloc |
441 | # define REGEX_REALLOCATE(source, osize, nsize) realloc (source, nsize) | |
442 | # define REGEX_FREE free | |
fa9a63c5 RM |
443 | |
444 | #else /* not REGEX_MALLOC */ | |
445 | ||
446 | /* Emacs already defines alloca, sometimes. */ | |
0b32bf0e | 447 | # ifndef alloca |
fa9a63c5 RM |
448 | |
449 | /* Make alloca work the best possible way. */ | |
0b32bf0e SM |
450 | # ifdef __GNUC__ |
451 | # define alloca __builtin_alloca | |
452 | # else /* not __GNUC__ */ | |
453 | # if HAVE_ALLOCA_H | |
454 | # include <alloca.h> | |
455 | # endif /* HAVE_ALLOCA_H */ | |
456 | # endif /* not __GNUC__ */ | |
fa9a63c5 | 457 | |
0b32bf0e | 458 | # endif /* not alloca */ |
fa9a63c5 | 459 | |
0b32bf0e | 460 | # define REGEX_ALLOCATE alloca |
fa9a63c5 RM |
461 | |
462 | /* Assumes a `char *destination' variable. */ | |
0b32bf0e | 463 | # define REGEX_REALLOCATE(source, osize, nsize) \ |
fa9a63c5 | 464 | (destination = (char *) alloca (nsize), \ |
4bb91c68 | 465 | memcpy (destination, source, osize)) |
fa9a63c5 RM |
466 | |
467 | /* No need to do anything to free, after alloca. */ | |
0b32bf0e | 468 | # define REGEX_FREE(arg) ((void)0) /* Do nothing! But inhibit gcc warning. */ |
fa9a63c5 RM |
469 | |
470 | #endif /* not REGEX_MALLOC */ | |
471 | ||
472 | /* Define how to allocate the failure stack. */ | |
473 | ||
0b32bf0e | 474 | #if defined REL_ALLOC && defined REGEX_MALLOC |
4297555e | 475 | |
0b32bf0e | 476 | # define REGEX_ALLOCATE_STACK(size) \ |
fa9a63c5 | 477 | r_alloc (&failure_stack_ptr, (size)) |
0b32bf0e | 478 | # define REGEX_REALLOCATE_STACK(source, osize, nsize) \ |
fa9a63c5 | 479 | r_re_alloc (&failure_stack_ptr, (nsize)) |
0b32bf0e | 480 | # define REGEX_FREE_STACK(ptr) \ |
fa9a63c5 RM |
481 | r_alloc_free (&failure_stack_ptr) |
482 | ||
4297555e | 483 | #else /* not using relocating allocator */ |
fa9a63c5 | 484 | |
0b32bf0e | 485 | # ifdef REGEX_MALLOC |
fa9a63c5 | 486 | |
0b32bf0e SM |
487 | # define REGEX_ALLOCATE_STACK malloc |
488 | # define REGEX_REALLOCATE_STACK(source, osize, nsize) realloc (source, nsize) | |
489 | # define REGEX_FREE_STACK free | |
fa9a63c5 | 490 | |
0b32bf0e | 491 | # else /* not REGEX_MALLOC */ |
fa9a63c5 | 492 | |
0b32bf0e | 493 | # define REGEX_ALLOCATE_STACK alloca |
fa9a63c5 | 494 | |
0b32bf0e | 495 | # define REGEX_REALLOCATE_STACK(source, osize, nsize) \ |
fa9a63c5 | 496 | REGEX_REALLOCATE (source, osize, nsize) |
25fe55af | 497 | /* No need to explicitly free anything. */ |
0b32bf0e | 498 | # define REGEX_FREE_STACK(arg) ((void)0) |
fa9a63c5 | 499 | |
0b32bf0e | 500 | # endif /* not REGEX_MALLOC */ |
4297555e | 501 | #endif /* not using relocating allocator */ |
fa9a63c5 RM |
502 | |
503 | ||
504 | /* True if `size1' is non-NULL and PTR is pointing anywhere inside | |
505 | `string1' or just past its end. This works if PTR is NULL, which is | |
506 | a good thing. */ | |
25fe55af | 507 | #define FIRST_STRING_P(ptr) \ |
fa9a63c5 RM |
508 | (size1 && string1 <= (ptr) && (ptr) <= string1 + size1) |
509 | ||
510 | /* (Re)Allocate N items of type T using malloc, or fail. */ | |
511 | #define TALLOC(n, t) ((t *) malloc ((n) * sizeof (t))) | |
512 | #define RETALLOC(addr, n, t) ((addr) = (t *) realloc (addr, (n) * sizeof (t))) | |
513 | #define RETALLOC_IF(addr, n, t) \ | |
514 | if (addr) RETALLOC((addr), (n), t); else (addr) = TALLOC ((n), t) | |
515 | #define REGEX_TALLOC(n, t) ((t *) REGEX_ALLOCATE ((n) * sizeof (t))) | |
516 | ||
4bb91c68 | 517 | #define BYTEWIDTH 8 /* In bits. */ |
fa9a63c5 RM |
518 | |
519 | #define STREQ(s1, s2) ((strcmp (s1, s2) == 0)) | |
520 | ||
521 | #undef MAX | |
522 | #undef MIN | |
523 | #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
524 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
525 | ||
66f0296e SM |
526 | /* Type of source-pattern and string chars. */ |
527 | typedef const unsigned char re_char; | |
528 | ||
fa9a63c5 RM |
529 | typedef char boolean; |
530 | #define false 0 | |
531 | #define true 1 | |
532 | ||
4bb91c68 SM |
533 | static int re_match_2_internal _RE_ARGS ((struct re_pattern_buffer *bufp, |
534 | re_char *string1, int size1, | |
535 | re_char *string2, int size2, | |
536 | int pos, | |
537 | struct re_registers *regs, | |
538 | int stop)); | |
fa9a63c5 RM |
539 | \f |
540 | /* These are the command codes that appear in compiled regular | |
4bb91c68 | 541 | expressions. Some opcodes are followed by argument bytes. A |
fa9a63c5 RM |
542 | command code can specify any interpretation whatsoever for its |
543 | arguments. Zero bytes may appear in the compiled regular expression. */ | |
544 | ||
545 | typedef enum | |
546 | { | |
547 | no_op = 0, | |
548 | ||
4bb91c68 | 549 | /* Succeed right away--no more backtracking. */ |
fa9a63c5 RM |
550 | succeed, |
551 | ||
25fe55af | 552 | /* Followed by one byte giving n, then by n literal bytes. */ |
fa9a63c5 RM |
553 | exactn, |
554 | ||
25fe55af | 555 | /* Matches any (more or less) character. */ |
fa9a63c5 RM |
556 | anychar, |
557 | ||
25fe55af RS |
558 | /* Matches any one char belonging to specified set. First |
559 | following byte is number of bitmap bytes. Then come bytes | |
560 | for a bitmap saying which chars are in. Bits in each byte | |
561 | are ordered low-bit-first. A character is in the set if its | |
562 | bit is 1. A character too large to have a bit in the map is | |
96cc36cc RS |
563 | automatically not in the set. |
564 | ||
565 | If the length byte has the 0x80 bit set, then that stuff | |
566 | is followed by a range table: | |
567 | 2 bytes of flags for character sets (low 8 bits, high 8 bits) | |
0b32bf0e | 568 | See RANGE_TABLE_WORK_BITS below. |
01618498 | 569 | 2 bytes, the number of pairs that follow (upto 32767) |
96cc36cc | 570 | pairs, each 2 multibyte characters, |
0b32bf0e | 571 | each multibyte character represented as 3 bytes. */ |
fa9a63c5 RM |
572 | charset, |
573 | ||
25fe55af | 574 | /* Same parameters as charset, but match any character that is |
4bb91c68 | 575 | not one of those specified. */ |
fa9a63c5 RM |
576 | charset_not, |
577 | ||
25fe55af RS |
578 | /* Start remembering the text that is matched, for storing in a |
579 | register. Followed by one byte with the register number, in | |
580 | the range 0 to one less than the pattern buffer's re_nsub | |
505bde11 | 581 | field. */ |
fa9a63c5 RM |
582 | start_memory, |
583 | ||
25fe55af RS |
584 | /* Stop remembering the text that is matched and store it in a |
585 | memory register. Followed by one byte with the register | |
586 | number, in the range 0 to one less than `re_nsub' in the | |
505bde11 | 587 | pattern buffer. */ |
fa9a63c5 RM |
588 | stop_memory, |
589 | ||
25fe55af | 590 | /* Match a duplicate of something remembered. Followed by one |
4bb91c68 | 591 | byte containing the register number. */ |
fa9a63c5 RM |
592 | duplicate, |
593 | ||
25fe55af | 594 | /* Fail unless at beginning of line. */ |
fa9a63c5 RM |
595 | begline, |
596 | ||
4bb91c68 | 597 | /* Fail unless at end of line. */ |
fa9a63c5 RM |
598 | endline, |
599 | ||
25fe55af RS |
600 | /* Succeeds if at beginning of buffer (if emacs) or at beginning |
601 | of string to be matched (if not). */ | |
fa9a63c5 RM |
602 | begbuf, |
603 | ||
25fe55af | 604 | /* Analogously, for end of buffer/string. */ |
fa9a63c5 | 605 | endbuf, |
5e69f11e | 606 | |
25fe55af | 607 | /* Followed by two byte relative address to which to jump. */ |
5e69f11e | 608 | jump, |
fa9a63c5 | 609 | |
25fe55af RS |
610 | /* Followed by two-byte relative address of place to resume at |
611 | in case of failure. */ | |
fa9a63c5 | 612 | on_failure_jump, |
5e69f11e | 613 | |
25fe55af RS |
614 | /* Like on_failure_jump, but pushes a placeholder instead of the |
615 | current string position when executed. */ | |
fa9a63c5 | 616 | on_failure_keep_string_jump, |
5e69f11e | 617 | |
505bde11 SM |
618 | /* Just like `on_failure_jump', except that it checks that we |
619 | don't get stuck in an infinite loop (matching an empty string | |
620 | indefinitely). */ | |
621 | on_failure_jump_loop, | |
622 | ||
0683b6fa SM |
623 | /* Just like `on_failure_jump_loop', except that it checks for |
624 | a different kind of loop (the kind that shows up with non-greedy | |
625 | operators). This operation has to be immediately preceded | |
626 | by a `no_op'. */ | |
627 | on_failure_jump_nastyloop, | |
628 | ||
0b32bf0e | 629 | /* A smart `on_failure_jump' used for greedy * and + operators. |
505bde11 SM |
630 | It analyses the loop before which it is put and if the |
631 | loop does not require backtracking, it changes itself to | |
4e8a9132 SM |
632 | `on_failure_keep_string_jump' and short-circuits the loop, |
633 | else it just defaults to changing itself into `on_failure_jump'. | |
634 | It assumes that it is pointing to just past a `jump'. */ | |
505bde11 | 635 | on_failure_jump_smart, |
fa9a63c5 | 636 | |
25fe55af | 637 | /* Followed by two-byte relative address and two-byte number n. |
ed0767d8 SM |
638 | After matching N times, jump to the address upon failure. |
639 | Does not work if N starts at 0: use on_failure_jump_loop | |
640 | instead. */ | |
fa9a63c5 RM |
641 | succeed_n, |
642 | ||
25fe55af RS |
643 | /* Followed by two-byte relative address, and two-byte number n. |
644 | Jump to the address N times, then fail. */ | |
fa9a63c5 RM |
645 | jump_n, |
646 | ||
25fe55af RS |
647 | /* Set the following two-byte relative address to the |
648 | subsequent two-byte number. The address *includes* the two | |
649 | bytes of number. */ | |
fa9a63c5 RM |
650 | set_number_at, |
651 | ||
fa9a63c5 RM |
652 | wordbeg, /* Succeeds if at word beginning. */ |
653 | wordend, /* Succeeds if at word end. */ | |
654 | ||
655 | wordbound, /* Succeeds if at a word boundary. */ | |
1fb352e0 | 656 | notwordbound, /* Succeeds if not at a word boundary. */ |
fa9a63c5 RM |
657 | |
658 | /* Matches any character whose syntax is specified. Followed by | |
25fe55af | 659 | a byte which contains a syntax code, e.g., Sword. */ |
fa9a63c5 RM |
660 | syntaxspec, |
661 | ||
662 | /* Matches any character whose syntax is not that specified. */ | |
1fb352e0 SM |
663 | notsyntaxspec |
664 | ||
665 | #ifdef emacs | |
666 | ,before_dot, /* Succeeds if before point. */ | |
667 | at_dot, /* Succeeds if at point. */ | |
668 | after_dot, /* Succeeds if after point. */ | |
b18215fc RS |
669 | |
670 | /* Matches any character whose category-set contains the specified | |
25fe55af RS |
671 | category. The operator is followed by a byte which contains a |
672 | category code (mnemonic ASCII character). */ | |
b18215fc RS |
673 | categoryspec, |
674 | ||
675 | /* Matches any character whose category-set does not contain the | |
676 | specified category. The operator is followed by a byte which | |
677 | contains the category code (mnemonic ASCII character). */ | |
678 | notcategoryspec | |
fa9a63c5 RM |
679 | #endif /* emacs */ |
680 | } re_opcode_t; | |
681 | \f | |
682 | /* Common operations on the compiled pattern. */ | |
683 | ||
684 | /* Store NUMBER in two contiguous bytes starting at DESTINATION. */ | |
685 | ||
686 | #define STORE_NUMBER(destination, number) \ | |
687 | do { \ | |
688 | (destination)[0] = (number) & 0377; \ | |
689 | (destination)[1] = (number) >> 8; \ | |
690 | } while (0) | |
691 | ||
692 | /* Same as STORE_NUMBER, except increment DESTINATION to | |
693 | the byte after where the number is stored. Therefore, DESTINATION | |
694 | must be an lvalue. */ | |
695 | ||
696 | #define STORE_NUMBER_AND_INCR(destination, number) \ | |
697 | do { \ | |
698 | STORE_NUMBER (destination, number); \ | |
699 | (destination) += 2; \ | |
700 | } while (0) | |
701 | ||
702 | /* Put into DESTINATION a number stored in two contiguous bytes starting | |
703 | at SOURCE. */ | |
704 | ||
705 | #define EXTRACT_NUMBER(destination, source) \ | |
706 | do { \ | |
707 | (destination) = *(source) & 0377; \ | |
708 | (destination) += SIGN_EXTEND_CHAR (*((source) + 1)) << 8; \ | |
709 | } while (0) | |
710 | ||
711 | #ifdef DEBUG | |
4bb91c68 | 712 | static void extract_number _RE_ARGS ((int *dest, re_char *source)); |
fa9a63c5 RM |
713 | static void |
714 | extract_number (dest, source) | |
715 | int *dest; | |
01618498 | 716 | re_char *source; |
fa9a63c5 | 717 | { |
5e69f11e | 718 | int temp = SIGN_EXTEND_CHAR (*(source + 1)); |
fa9a63c5 RM |
719 | *dest = *source & 0377; |
720 | *dest += temp << 8; | |
721 | } | |
722 | ||
4bb91c68 | 723 | # ifndef EXTRACT_MACROS /* To debug the macros. */ |
0b32bf0e SM |
724 | # undef EXTRACT_NUMBER |
725 | # define EXTRACT_NUMBER(dest, src) extract_number (&dest, src) | |
726 | # endif /* not EXTRACT_MACROS */ | |
fa9a63c5 RM |
727 | |
728 | #endif /* DEBUG */ | |
729 | ||
730 | /* Same as EXTRACT_NUMBER, except increment SOURCE to after the number. | |
731 | SOURCE must be an lvalue. */ | |
732 | ||
733 | #define EXTRACT_NUMBER_AND_INCR(destination, source) \ | |
734 | do { \ | |
735 | EXTRACT_NUMBER (destination, source); \ | |
25fe55af | 736 | (source) += 2; \ |
fa9a63c5 RM |
737 | } while (0) |
738 | ||
739 | #ifdef DEBUG | |
4bb91c68 SM |
740 | static void extract_number_and_incr _RE_ARGS ((int *destination, |
741 | re_char **source)); | |
fa9a63c5 RM |
742 | static void |
743 | extract_number_and_incr (destination, source) | |
744 | int *destination; | |
01618498 | 745 | re_char **source; |
5e69f11e | 746 | { |
fa9a63c5 RM |
747 | extract_number (destination, *source); |
748 | *source += 2; | |
749 | } | |
750 | ||
0b32bf0e SM |
751 | # ifndef EXTRACT_MACROS |
752 | # undef EXTRACT_NUMBER_AND_INCR | |
753 | # define EXTRACT_NUMBER_AND_INCR(dest, src) \ | |
fa9a63c5 | 754 | extract_number_and_incr (&dest, &src) |
0b32bf0e | 755 | # endif /* not EXTRACT_MACROS */ |
fa9a63c5 RM |
756 | |
757 | #endif /* DEBUG */ | |
758 | \f | |
b18215fc RS |
759 | /* Store a multibyte character in three contiguous bytes starting |
760 | DESTINATION, and increment DESTINATION to the byte after where the | |
25fe55af | 761 | character is stored. Therefore, DESTINATION must be an lvalue. */ |
b18215fc RS |
762 | |
763 | #define STORE_CHARACTER_AND_INCR(destination, character) \ | |
764 | do { \ | |
765 | (destination)[0] = (character) & 0377; \ | |
766 | (destination)[1] = ((character) >> 8) & 0377; \ | |
767 | (destination)[2] = (character) >> 16; \ | |
768 | (destination) += 3; \ | |
769 | } while (0) | |
770 | ||
771 | /* Put into DESTINATION a character stored in three contiguous bytes | |
25fe55af | 772 | starting at SOURCE. */ |
b18215fc RS |
773 | |
774 | #define EXTRACT_CHARACTER(destination, source) \ | |
775 | do { \ | |
776 | (destination) = ((source)[0] \ | |
777 | | ((source)[1] << 8) \ | |
778 | | ((source)[2] << 16)); \ | |
779 | } while (0) | |
780 | ||
781 | ||
782 | /* Macros for charset. */ | |
783 | ||
784 | /* Size of bitmap of charset P in bytes. P is a start of charset, | |
785 | i.e. *P is (re_opcode_t) charset or (re_opcode_t) charset_not. */ | |
786 | #define CHARSET_BITMAP_SIZE(p) ((p)[1] & 0x7F) | |
787 | ||
788 | /* Nonzero if charset P has range table. */ | |
25fe55af | 789 | #define CHARSET_RANGE_TABLE_EXISTS_P(p) ((p)[1] & 0x80) |
b18215fc RS |
790 | |
791 | /* Return the address of range table of charset P. But not the start | |
792 | of table itself, but the before where the number of ranges is | |
96cc36cc RS |
793 | stored. `2 +' means to skip re_opcode_t and size of bitmap, |
794 | and the 2 bytes of flags at the start of the range table. */ | |
795 | #define CHARSET_RANGE_TABLE(p) (&(p)[4 + CHARSET_BITMAP_SIZE (p)]) | |
796 | ||
797 | /* Extract the bit flags that start a range table. */ | |
798 | #define CHARSET_RANGE_TABLE_BITS(p) \ | |
799 | ((p)[2 + CHARSET_BITMAP_SIZE (p)] \ | |
800 | + (p)[3 + CHARSET_BITMAP_SIZE (p)] * 0x100) | |
b18215fc RS |
801 | |
802 | /* Test if C is listed in the bitmap of charset P. */ | |
803 | #define CHARSET_LOOKUP_BITMAP(p, c) \ | |
804 | ((c) < CHARSET_BITMAP_SIZE (p) * BYTEWIDTH \ | |
805 | && (p)[2 + (c) / BYTEWIDTH] & (1 << ((c) % BYTEWIDTH))) | |
806 | ||
807 | /* Return the address of end of RANGE_TABLE. COUNT is number of | |
25fe55af RS |
808 | ranges (which is a pair of (start, end)) in the RANGE_TABLE. `* 2' |
809 | is start of range and end of range. `* 3' is size of each start | |
b18215fc RS |
810 | and end. */ |
811 | #define CHARSET_RANGE_TABLE_END(range_table, count) \ | |
812 | ((range_table) + (count) * 2 * 3) | |
813 | ||
25fe55af | 814 | /* Test if C is in RANGE_TABLE. A flag NOT is negated if C is in. |
b18215fc RS |
815 | COUNT is number of ranges in RANGE_TABLE. */ |
816 | #define CHARSET_LOOKUP_RANGE_TABLE_RAW(not, c, range_table, count) \ | |
817 | do \ | |
818 | { \ | |
01618498 SM |
819 | re_wchar_t range_start, range_end; \ |
820 | re_char *p; \ | |
821 | re_char *range_table_end \ | |
b18215fc RS |
822 | = CHARSET_RANGE_TABLE_END ((range_table), (count)); \ |
823 | \ | |
824 | for (p = (range_table); p < range_table_end; p += 2 * 3) \ | |
825 | { \ | |
826 | EXTRACT_CHARACTER (range_start, p); \ | |
827 | EXTRACT_CHARACTER (range_end, p + 3); \ | |
828 | \ | |
829 | if (range_start <= (c) && (c) <= range_end) \ | |
830 | { \ | |
831 | (not) = !(not); \ | |
832 | break; \ | |
833 | } \ | |
834 | } \ | |
835 | } \ | |
836 | while (0) | |
837 | ||
838 | /* Test if C is in range table of CHARSET. The flag NOT is negated if | |
839 | C is listed in it. */ | |
840 | #define CHARSET_LOOKUP_RANGE_TABLE(not, c, charset) \ | |
841 | do \ | |
842 | { \ | |
843 | /* Number of ranges in range table. */ \ | |
844 | int count; \ | |
01618498 SM |
845 | re_char *range_table = CHARSET_RANGE_TABLE (charset); \ |
846 | \ | |
b18215fc RS |
847 | EXTRACT_NUMBER_AND_INCR (count, range_table); \ |
848 | CHARSET_LOOKUP_RANGE_TABLE_RAW ((not), (c), range_table, count); \ | |
849 | } \ | |
850 | while (0) | |
851 | \f | |
fa9a63c5 RM |
852 | /* If DEBUG is defined, Regex prints many voluminous messages about what |
853 | it is doing (if the variable `debug' is nonzero). If linked with the | |
854 | main program in `iregex.c', you can enter patterns and strings | |
855 | interactively. And if linked with the main program in `main.c' and | |
4bb91c68 | 856 | the other test files, you can run the already-written tests. */ |
fa9a63c5 RM |
857 | |
858 | #ifdef DEBUG | |
859 | ||
860 | /* We use standard I/O for debugging. */ | |
0b32bf0e | 861 | # include <stdio.h> |
fa9a63c5 RM |
862 | |
863 | /* It is useful to test things that ``must'' be true when debugging. */ | |
0b32bf0e | 864 | # include <assert.h> |
fa9a63c5 | 865 | |
99633e97 | 866 | static int debug = -100000; |
fa9a63c5 | 867 | |
0b32bf0e SM |
868 | # define DEBUG_STATEMENT(e) e |
869 | # define DEBUG_PRINT1(x) if (debug > 0) printf (x) | |
870 | # define DEBUG_PRINT2(x1, x2) if (debug > 0) printf (x1, x2) | |
871 | # define DEBUG_PRINT3(x1, x2, x3) if (debug > 0) printf (x1, x2, x3) | |
872 | # define DEBUG_PRINT4(x1, x2, x3, x4) if (debug > 0) printf (x1, x2, x3, x4) | |
873 | # define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) \ | |
99633e97 | 874 | if (debug > 0) print_partial_compiled_pattern (s, e) |
0b32bf0e | 875 | # define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) \ |
99633e97 | 876 | if (debug > 0) print_double_string (w, s1, sz1, s2, sz2) |
fa9a63c5 RM |
877 | |
878 | ||
879 | /* Print the fastmap in human-readable form. */ | |
880 | ||
881 | void | |
882 | print_fastmap (fastmap) | |
883 | char *fastmap; | |
884 | { | |
885 | unsigned was_a_range = 0; | |
5e69f11e RM |
886 | unsigned i = 0; |
887 | ||
fa9a63c5 RM |
888 | while (i < (1 << BYTEWIDTH)) |
889 | { | |
890 | if (fastmap[i++]) | |
891 | { | |
892 | was_a_range = 0; | |
25fe55af RS |
893 | putchar (i - 1); |
894 | while (i < (1 << BYTEWIDTH) && fastmap[i]) | |
895 | { | |
896 | was_a_range = 1; | |
897 | i++; | |
898 | } | |
fa9a63c5 | 899 | if (was_a_range) |
25fe55af RS |
900 | { |
901 | printf ("-"); | |
902 | putchar (i - 1); | |
903 | } | |
904 | } | |
fa9a63c5 | 905 | } |
5e69f11e | 906 | putchar ('\n'); |
fa9a63c5 RM |
907 | } |
908 | ||
909 | ||
910 | /* Print a compiled pattern string in human-readable form, starting at | |
911 | the START pointer into it and ending just before the pointer END. */ | |
912 | ||
913 | void | |
914 | print_partial_compiled_pattern (start, end) | |
01618498 SM |
915 | re_char *start; |
916 | re_char *end; | |
fa9a63c5 RM |
917 | { |
918 | int mcnt, mcnt2; | |
01618498 SM |
919 | re_char *p = start; |
920 | re_char *pend = end; | |
fa9a63c5 RM |
921 | |
922 | if (start == NULL) | |
923 | { | |
924 | printf ("(null)\n"); | |
925 | return; | |
926 | } | |
5e69f11e | 927 | |
fa9a63c5 RM |
928 | /* Loop over pattern commands. */ |
929 | while (p < pend) | |
930 | { | |
931 | printf ("%d:\t", p - start); | |
932 | ||
933 | switch ((re_opcode_t) *p++) | |
934 | { | |
25fe55af RS |
935 | case no_op: |
936 | printf ("/no_op"); | |
937 | break; | |
fa9a63c5 | 938 | |
99633e97 SM |
939 | case succeed: |
940 | printf ("/succeed"); | |
941 | break; | |
942 | ||
fa9a63c5 RM |
943 | case exactn: |
944 | mcnt = *p++; | |
25fe55af RS |
945 | printf ("/exactn/%d", mcnt); |
946 | do | |
fa9a63c5 | 947 | { |
25fe55af | 948 | putchar ('/'); |
fa9a63c5 | 949 | putchar (*p++); |
25fe55af RS |
950 | } |
951 | while (--mcnt); | |
952 | break; | |
fa9a63c5 RM |
953 | |
954 | case start_memory: | |
505bde11 | 955 | printf ("/start_memory/%d", *p++); |
25fe55af | 956 | break; |
fa9a63c5 RM |
957 | |
958 | case stop_memory: | |
505bde11 | 959 | printf ("/stop_memory/%d", *p++); |
25fe55af | 960 | break; |
fa9a63c5 RM |
961 | |
962 | case duplicate: | |
963 | printf ("/duplicate/%d", *p++); | |
964 | break; | |
965 | ||
966 | case anychar: | |
967 | printf ("/anychar"); | |
968 | break; | |
969 | ||
970 | case charset: | |
25fe55af RS |
971 | case charset_not: |
972 | { | |
973 | register int c, last = -100; | |
fa9a63c5 | 974 | register int in_range = 0; |
99633e97 SM |
975 | int length = CHARSET_BITMAP_SIZE (p - 1); |
976 | int has_range_table = CHARSET_RANGE_TABLE_EXISTS_P (p - 1); | |
fa9a63c5 RM |
977 | |
978 | printf ("/charset [%s", | |
25fe55af | 979 | (re_opcode_t) *(p - 1) == charset_not ? "^" : ""); |
5e69f11e | 980 | |
25fe55af | 981 | assert (p + *p < pend); |
fa9a63c5 | 982 | |
25fe55af | 983 | for (c = 0; c < 256; c++) |
96cc36cc | 984 | if (c / 8 < length |
fa9a63c5 RM |
985 | && (p[1 + (c/8)] & (1 << (c % 8)))) |
986 | { | |
987 | /* Are we starting a range? */ | |
988 | if (last + 1 == c && ! in_range) | |
989 | { | |
990 | putchar ('-'); | |
991 | in_range = 1; | |
992 | } | |
993 | /* Have we broken a range? */ | |
994 | else if (last + 1 != c && in_range) | |
96cc36cc | 995 | { |
fa9a63c5 RM |
996 | putchar (last); |
997 | in_range = 0; | |
998 | } | |
5e69f11e | 999 | |
fa9a63c5 RM |
1000 | if (! in_range) |
1001 | putchar (c); | |
1002 | ||
1003 | last = c; | |
25fe55af | 1004 | } |
fa9a63c5 RM |
1005 | |
1006 | if (in_range) | |
1007 | putchar (last); | |
1008 | ||
1009 | putchar (']'); | |
1010 | ||
99633e97 | 1011 | p += 1 + length; |
96cc36cc | 1012 | |
96cc36cc | 1013 | if (has_range_table) |
99633e97 SM |
1014 | { |
1015 | int count; | |
1016 | printf ("has-range-table"); | |
1017 | ||
1018 | /* ??? Should print the range table; for now, just skip it. */ | |
1019 | p += 2; /* skip range table bits */ | |
1020 | EXTRACT_NUMBER_AND_INCR (count, p); | |
1021 | p = CHARSET_RANGE_TABLE_END (p, count); | |
1022 | } | |
fa9a63c5 RM |
1023 | } |
1024 | break; | |
1025 | ||
1026 | case begline: | |
1027 | printf ("/begline"); | |
25fe55af | 1028 | break; |
fa9a63c5 RM |
1029 | |
1030 | case endline: | |
25fe55af RS |
1031 | printf ("/endline"); |
1032 | break; | |
fa9a63c5 RM |
1033 | |
1034 | case on_failure_jump: | |
25fe55af RS |
1035 | extract_number_and_incr (&mcnt, &p); |
1036 | printf ("/on_failure_jump to %d", p + mcnt - start); | |
1037 | break; | |
fa9a63c5 RM |
1038 | |
1039 | case on_failure_keep_string_jump: | |
25fe55af RS |
1040 | extract_number_and_incr (&mcnt, &p); |
1041 | printf ("/on_failure_keep_string_jump to %d", p + mcnt - start); | |
1042 | break; | |
fa9a63c5 | 1043 | |
0683b6fa SM |
1044 | case on_failure_jump_nastyloop: |
1045 | extract_number_and_incr (&mcnt, &p); | |
1046 | printf ("/on_failure_jump_nastyloop to %d", p + mcnt - start); | |
1047 | break; | |
1048 | ||
505bde11 | 1049 | case on_failure_jump_loop: |
fa9a63c5 | 1050 | extract_number_and_incr (&mcnt, &p); |
505bde11 | 1051 | printf ("/on_failure_jump_loop to %d", p + mcnt - start); |
5e69f11e RM |
1052 | break; |
1053 | ||
505bde11 | 1054 | case on_failure_jump_smart: |
fa9a63c5 | 1055 | extract_number_and_incr (&mcnt, &p); |
505bde11 | 1056 | printf ("/on_failure_jump_smart to %d", p + mcnt - start); |
5e69f11e RM |
1057 | break; |
1058 | ||
25fe55af | 1059 | case jump: |
fa9a63c5 | 1060 | extract_number_and_incr (&mcnt, &p); |
25fe55af | 1061 | printf ("/jump to %d", p + mcnt - start); |
fa9a63c5 RM |
1062 | break; |
1063 | ||
25fe55af RS |
1064 | case succeed_n: |
1065 | extract_number_and_incr (&mcnt, &p); | |
1066 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 1067 | printf ("/succeed_n to %d, %d times", p - 2 + mcnt - start, mcnt2); |
25fe55af | 1068 | break; |
5e69f11e | 1069 | |
25fe55af RS |
1070 | case jump_n: |
1071 | extract_number_and_incr (&mcnt, &p); | |
1072 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 1073 | printf ("/jump_n to %d, %d times", p - 2 + mcnt - start, mcnt2); |
25fe55af | 1074 | break; |
5e69f11e | 1075 | |
25fe55af RS |
1076 | case set_number_at: |
1077 | extract_number_and_incr (&mcnt, &p); | |
1078 | extract_number_and_incr (&mcnt2, &p); | |
99633e97 | 1079 | printf ("/set_number_at location %d to %d", p - 2 + mcnt - start, mcnt2); |
25fe55af | 1080 | break; |
5e69f11e | 1081 | |
25fe55af | 1082 | case wordbound: |
fa9a63c5 RM |
1083 | printf ("/wordbound"); |
1084 | break; | |
1085 | ||
1086 | case notwordbound: | |
1087 | printf ("/notwordbound"); | |
25fe55af | 1088 | break; |
fa9a63c5 RM |
1089 | |
1090 | case wordbeg: | |
1091 | printf ("/wordbeg"); | |
1092 | break; | |
5e69f11e | 1093 | |
fa9a63c5 RM |
1094 | case wordend: |
1095 | printf ("/wordend"); | |
5e69f11e | 1096 | |
1fb352e0 SM |
1097 | case syntaxspec: |
1098 | printf ("/syntaxspec"); | |
1099 | mcnt = *p++; | |
1100 | printf ("/%d", mcnt); | |
1101 | break; | |
1102 | ||
1103 | case notsyntaxspec: | |
1104 | printf ("/notsyntaxspec"); | |
1105 | mcnt = *p++; | |
1106 | printf ("/%d", mcnt); | |
1107 | break; | |
1108 | ||
0b32bf0e | 1109 | # ifdef emacs |
fa9a63c5 RM |
1110 | case before_dot: |
1111 | printf ("/before_dot"); | |
25fe55af | 1112 | break; |
fa9a63c5 RM |
1113 | |
1114 | case at_dot: | |
1115 | printf ("/at_dot"); | |
25fe55af | 1116 | break; |
fa9a63c5 RM |
1117 | |
1118 | case after_dot: | |
1119 | printf ("/after_dot"); | |
25fe55af | 1120 | break; |
fa9a63c5 | 1121 | |
1fb352e0 SM |
1122 | case categoryspec: |
1123 | printf ("/categoryspec"); | |
fa9a63c5 RM |
1124 | mcnt = *p++; |
1125 | printf ("/%d", mcnt); | |
25fe55af | 1126 | break; |
5e69f11e | 1127 | |
1fb352e0 SM |
1128 | case notcategoryspec: |
1129 | printf ("/notcategoryspec"); | |
fa9a63c5 RM |
1130 | mcnt = *p++; |
1131 | printf ("/%d", mcnt); | |
1132 | break; | |
0b32bf0e | 1133 | # endif /* emacs */ |
fa9a63c5 | 1134 | |
fa9a63c5 RM |
1135 | case begbuf: |
1136 | printf ("/begbuf"); | |
25fe55af | 1137 | break; |
fa9a63c5 RM |
1138 | |
1139 | case endbuf: | |
1140 | printf ("/endbuf"); | |
25fe55af | 1141 | break; |
fa9a63c5 | 1142 | |
25fe55af RS |
1143 | default: |
1144 | printf ("?%d", *(p-1)); | |
fa9a63c5 RM |
1145 | } |
1146 | ||
1147 | putchar ('\n'); | |
1148 | } | |
1149 | ||
1150 | printf ("%d:\tend of pattern.\n", p - start); | |
1151 | } | |
1152 | ||
1153 | ||
1154 | void | |
1155 | print_compiled_pattern (bufp) | |
1156 | struct re_pattern_buffer *bufp; | |
1157 | { | |
01618498 | 1158 | re_char *buffer = bufp->buffer; |
fa9a63c5 RM |
1159 | |
1160 | print_partial_compiled_pattern (buffer, buffer + bufp->used); | |
4bb91c68 SM |
1161 | printf ("%ld bytes used/%ld bytes allocated.\n", |
1162 | bufp->used, bufp->allocated); | |
fa9a63c5 RM |
1163 | |
1164 | if (bufp->fastmap_accurate && bufp->fastmap) | |
1165 | { | |
1166 | printf ("fastmap: "); | |
1167 | print_fastmap (bufp->fastmap); | |
1168 | } | |
1169 | ||
1170 | printf ("re_nsub: %d\t", bufp->re_nsub); | |
1171 | printf ("regs_alloc: %d\t", bufp->regs_allocated); | |
1172 | printf ("can_be_null: %d\t", bufp->can_be_null); | |
fa9a63c5 RM |
1173 | printf ("no_sub: %d\t", bufp->no_sub); |
1174 | printf ("not_bol: %d\t", bufp->not_bol); | |
1175 | printf ("not_eol: %d\t", bufp->not_eol); | |
4bb91c68 | 1176 | printf ("syntax: %lx\n", bufp->syntax); |
505bde11 | 1177 | fflush (stdout); |
fa9a63c5 RM |
1178 | /* Perhaps we should print the translate table? */ |
1179 | } | |
1180 | ||
1181 | ||
1182 | void | |
1183 | print_double_string (where, string1, size1, string2, size2) | |
66f0296e SM |
1184 | re_char *where; |
1185 | re_char *string1; | |
1186 | re_char *string2; | |
fa9a63c5 RM |
1187 | int size1; |
1188 | int size2; | |
1189 | { | |
4bb91c68 | 1190 | int this_char; |
5e69f11e | 1191 | |
fa9a63c5 RM |
1192 | if (where == NULL) |
1193 | printf ("(null)"); | |
1194 | else | |
1195 | { | |
1196 | if (FIRST_STRING_P (where)) | |
25fe55af RS |
1197 | { |
1198 | for (this_char = where - string1; this_char < size1; this_char++) | |
1199 | putchar (string1[this_char]); | |
fa9a63c5 | 1200 | |
25fe55af RS |
1201 | where = string2; |
1202 | } | |
fa9a63c5 RM |
1203 | |
1204 | for (this_char = where - string2; this_char < size2; this_char++) | |
25fe55af | 1205 | putchar (string2[this_char]); |
fa9a63c5 RM |
1206 | } |
1207 | } | |
1208 | ||
1209 | #else /* not DEBUG */ | |
1210 | ||
0b32bf0e SM |
1211 | # undef assert |
1212 | # define assert(e) | |
fa9a63c5 | 1213 | |
0b32bf0e SM |
1214 | # define DEBUG_STATEMENT(e) |
1215 | # define DEBUG_PRINT1(x) | |
1216 | # define DEBUG_PRINT2(x1, x2) | |
1217 | # define DEBUG_PRINT3(x1, x2, x3) | |
1218 | # define DEBUG_PRINT4(x1, x2, x3, x4) | |
1219 | # define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) | |
1220 | # define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) | |
fa9a63c5 RM |
1221 | |
1222 | #endif /* not DEBUG */ | |
1223 | \f | |
1224 | /* Set by `re_set_syntax' to the current regexp syntax to recognize. Can | |
1225 | also be assigned to arbitrarily: each pattern buffer stores its own | |
1226 | syntax, so it can be changed between regex compilations. */ | |
1227 | /* This has no initializer because initialized variables in Emacs | |
1228 | become read-only after dumping. */ | |
1229 | reg_syntax_t re_syntax_options; | |
1230 | ||
1231 | ||
1232 | /* Specify the precise syntax of regexps for compilation. This provides | |
1233 | for compatibility for various utilities which historically have | |
1234 | different, incompatible syntaxes. | |
1235 | ||
1236 | The argument SYNTAX is a bit mask comprised of the various bits | |
4bb91c68 | 1237 | defined in regex.h. We return the old syntax. */ |
fa9a63c5 RM |
1238 | |
1239 | reg_syntax_t | |
1240 | re_set_syntax (syntax) | |
1241 | reg_syntax_t syntax; | |
1242 | { | |
1243 | reg_syntax_t ret = re_syntax_options; | |
5e69f11e | 1244 | |
fa9a63c5 RM |
1245 | re_syntax_options = syntax; |
1246 | return ret; | |
1247 | } | |
c0f9ea08 | 1248 | WEAK_ALIAS (__re_set_syntax, re_set_syntax) |
fa9a63c5 RM |
1249 | \f |
1250 | /* This table gives an error message for each of the error codes listed | |
4bb91c68 | 1251 | in regex.h. Obviously the order here has to be same as there. |
fa9a63c5 | 1252 | POSIX doesn't require that we do anything for REG_NOERROR, |
4bb91c68 | 1253 | but why not be nice? */ |
fa9a63c5 RM |
1254 | |
1255 | static const char *re_error_msgid[] = | |
5e69f11e RM |
1256 | { |
1257 | gettext_noop ("Success"), /* REG_NOERROR */ | |
1258 | gettext_noop ("No match"), /* REG_NOMATCH */ | |
1259 | gettext_noop ("Invalid regular expression"), /* REG_BADPAT */ | |
1260 | gettext_noop ("Invalid collation character"), /* REG_ECOLLATE */ | |
1261 | gettext_noop ("Invalid character class name"), /* REG_ECTYPE */ | |
1262 | gettext_noop ("Trailing backslash"), /* REG_EESCAPE */ | |
1263 | gettext_noop ("Invalid back reference"), /* REG_ESUBREG */ | |
1264 | gettext_noop ("Unmatched [ or [^"), /* REG_EBRACK */ | |
1265 | gettext_noop ("Unmatched ( or \\("), /* REG_EPAREN */ | |
1266 | gettext_noop ("Unmatched \\{"), /* REG_EBRACE */ | |
1267 | gettext_noop ("Invalid content of \\{\\}"), /* REG_BADBR */ | |
1268 | gettext_noop ("Invalid range end"), /* REG_ERANGE */ | |
1269 | gettext_noop ("Memory exhausted"), /* REG_ESPACE */ | |
1270 | gettext_noop ("Invalid preceding regular expression"), /* REG_BADRPT */ | |
1271 | gettext_noop ("Premature end of regular expression"), /* REG_EEND */ | |
1272 | gettext_noop ("Regular expression too big"), /* REG_ESIZE */ | |
1273 | gettext_noop ("Unmatched ) or \\)"), /* REG_ERPAREN */ | |
fa9a63c5 RM |
1274 | }; |
1275 | \f | |
4bb91c68 | 1276 | /* Avoiding alloca during matching, to placate r_alloc. */ |
fa9a63c5 RM |
1277 | |
1278 | /* Define MATCH_MAY_ALLOCATE unless we need to make sure that the | |
1279 | searching and matching functions should not call alloca. On some | |
1280 | systems, alloca is implemented in terms of malloc, and if we're | |
1281 | using the relocating allocator routines, then malloc could cause a | |
1282 | relocation, which might (if the strings being searched are in the | |
1283 | ralloc heap) shift the data out from underneath the regexp | |
1284 | routines. | |
1285 | ||
5e69f11e | 1286 | Here's another reason to avoid allocation: Emacs |
fa9a63c5 RM |
1287 | processes input from X in a signal handler; processing X input may |
1288 | call malloc; if input arrives while a matching routine is calling | |
1289 | malloc, then we're scrod. But Emacs can't just block input while | |
1290 | calling matching routines; then we don't notice interrupts when | |
1291 | they come in. So, Emacs blocks input around all regexp calls | |
1292 | except the matching calls, which it leaves unprotected, in the | |
1293 | faith that they will not malloc. */ | |
1294 | ||
1295 | /* Normally, this is fine. */ | |
1296 | #define MATCH_MAY_ALLOCATE | |
1297 | ||
1298 | /* When using GNU C, we are not REALLY using the C alloca, no matter | |
1299 | what config.h may say. So don't take precautions for it. */ | |
1300 | #ifdef __GNUC__ | |
0b32bf0e | 1301 | # undef C_ALLOCA |
fa9a63c5 RM |
1302 | #endif |
1303 | ||
1304 | /* The match routines may not allocate if (1) they would do it with malloc | |
1305 | and (2) it's not safe for them to use malloc. | |
1306 | Note that if REL_ALLOC is defined, matching would not use malloc for the | |
1307 | failure stack, but we would still use it for the register vectors; | |
4bb91c68 | 1308 | so REL_ALLOC should not affect this. */ |
0b32bf0e SM |
1309 | #if (defined C_ALLOCA || defined REGEX_MALLOC) && defined emacs |
1310 | # undef MATCH_MAY_ALLOCATE | |
fa9a63c5 RM |
1311 | #endif |
1312 | ||
1313 | \f | |
1314 | /* Failure stack declarations and macros; both re_compile_fastmap and | |
1315 | re_match_2 use a failure stack. These have to be macros because of | |
1316 | REGEX_ALLOCATE_STACK. */ | |
5e69f11e | 1317 | |
fa9a63c5 | 1318 | |
320a2a73 | 1319 | /* Approximate number of failure points for which to initially allocate space |
fa9a63c5 RM |
1320 | when matching. If this number is exceeded, we allocate more |
1321 | space, so it is not a hard limit. */ | |
1322 | #ifndef INIT_FAILURE_ALLOC | |
0b32bf0e | 1323 | # define INIT_FAILURE_ALLOC 20 |
fa9a63c5 RM |
1324 | #endif |
1325 | ||
1326 | /* Roughly the maximum number of failure points on the stack. Would be | |
320a2a73 | 1327 | exactly that if always used TYPICAL_FAILURE_SIZE items each time we failed. |
fa9a63c5 | 1328 | This is a variable only so users of regex can assign to it; we never |
ada30c0e SM |
1329 | change it ourselves. We always multiply it by TYPICAL_FAILURE_SIZE |
1330 | before using it, so it should probably be a byte-count instead. */ | |
c0f9ea08 SM |
1331 | # if defined MATCH_MAY_ALLOCATE |
1332 | /* Note that 4400 was enough to cause a crash on Alpha OSF/1, | |
320a2a73 KH |
1333 | whose default stack limit is 2mb. In order for a larger |
1334 | value to work reliably, you have to try to make it accord | |
1335 | with the process stack limit. */ | |
c0f9ea08 SM |
1336 | size_t re_max_failures = 40000; |
1337 | # else | |
1338 | size_t re_max_failures = 4000; | |
1339 | # endif | |
fa9a63c5 RM |
1340 | |
1341 | union fail_stack_elt | |
1342 | { | |
01618498 | 1343 | re_char *pointer; |
c0f9ea08 SM |
1344 | /* This should be the biggest `int' that's no bigger than a pointer. */ |
1345 | long integer; | |
fa9a63c5 RM |
1346 | }; |
1347 | ||
1348 | typedef union fail_stack_elt fail_stack_elt_t; | |
1349 | ||
1350 | typedef struct | |
1351 | { | |
1352 | fail_stack_elt_t *stack; | |
c0f9ea08 SM |
1353 | size_t size; |
1354 | size_t avail; /* Offset of next open position. */ | |
1355 | size_t frame; /* Offset of the cur constructed frame. */ | |
fa9a63c5 RM |
1356 | } fail_stack_type; |
1357 | ||
505bde11 | 1358 | #define FAIL_STACK_EMPTY() (fail_stack.frame == 0) |
fa9a63c5 RM |
1359 | #define FAIL_STACK_FULL() (fail_stack.avail == fail_stack.size) |
1360 | ||
1361 | ||
1362 | /* Define macros to initialize and free the failure stack. | |
1363 | Do `return -2' if the alloc fails. */ | |
1364 | ||
1365 | #ifdef MATCH_MAY_ALLOCATE | |
0b32bf0e | 1366 | # define INIT_FAIL_STACK() \ |
fa9a63c5 RM |
1367 | do { \ |
1368 | fail_stack.stack = (fail_stack_elt_t *) \ | |
320a2a73 KH |
1369 | REGEX_ALLOCATE_STACK (INIT_FAILURE_ALLOC * TYPICAL_FAILURE_SIZE \ |
1370 | * sizeof (fail_stack_elt_t)); \ | |
fa9a63c5 RM |
1371 | \ |
1372 | if (fail_stack.stack == NULL) \ | |
1373 | return -2; \ | |
1374 | \ | |
1375 | fail_stack.size = INIT_FAILURE_ALLOC; \ | |
1376 | fail_stack.avail = 0; \ | |
505bde11 | 1377 | fail_stack.frame = 0; \ |
fa9a63c5 RM |
1378 | } while (0) |
1379 | ||
0b32bf0e | 1380 | # define RESET_FAIL_STACK() REGEX_FREE_STACK (fail_stack.stack) |
fa9a63c5 | 1381 | #else |
0b32bf0e | 1382 | # define INIT_FAIL_STACK() \ |
fa9a63c5 RM |
1383 | do { \ |
1384 | fail_stack.avail = 0; \ | |
505bde11 | 1385 | fail_stack.frame = 0; \ |
fa9a63c5 RM |
1386 | } while (0) |
1387 | ||
0b32bf0e | 1388 | # define RESET_FAIL_STACK() ((void)0) |
fa9a63c5 RM |
1389 | #endif |
1390 | ||
1391 | ||
320a2a73 KH |
1392 | /* Double the size of FAIL_STACK, up to a limit |
1393 | which allows approximately `re_max_failures' items. | |
fa9a63c5 RM |
1394 | |
1395 | Return 1 if succeeds, and 0 if either ran out of memory | |
5e69f11e RM |
1396 | allocating space for it or it was already too large. |
1397 | ||
4bb91c68 | 1398 | REGEX_REALLOCATE_STACK requires `destination' be declared. */ |
fa9a63c5 | 1399 | |
320a2a73 KH |
1400 | /* Factor to increase the failure stack size by |
1401 | when we increase it. | |
1402 | This used to be 2, but 2 was too wasteful | |
1403 | because the old discarded stacks added up to as much space | |
1404 | were as ultimate, maximum-size stack. */ | |
1405 | #define FAIL_STACK_GROWTH_FACTOR 4 | |
1406 | ||
1407 | #define GROW_FAIL_STACK(fail_stack) \ | |
eead07d6 KH |
1408 | (((fail_stack).size * sizeof (fail_stack_elt_t) \ |
1409 | >= re_max_failures * TYPICAL_FAILURE_SIZE) \ | |
fa9a63c5 | 1410 | ? 0 \ |
320a2a73 KH |
1411 | : ((fail_stack).stack \ |
1412 | = (fail_stack_elt_t *) \ | |
25fe55af RS |
1413 | REGEX_REALLOCATE_STACK ((fail_stack).stack, \ |
1414 | (fail_stack).size * sizeof (fail_stack_elt_t), \ | |
320a2a73 KH |
1415 | MIN (re_max_failures * TYPICAL_FAILURE_SIZE, \ |
1416 | ((fail_stack).size * sizeof (fail_stack_elt_t) \ | |
1417 | * FAIL_STACK_GROWTH_FACTOR))), \ | |
fa9a63c5 RM |
1418 | \ |
1419 | (fail_stack).stack == NULL \ | |
1420 | ? 0 \ | |
6453db45 KH |
1421 | : ((fail_stack).size \ |
1422 | = (MIN (re_max_failures * TYPICAL_FAILURE_SIZE, \ | |
1423 | ((fail_stack).size * sizeof (fail_stack_elt_t) \ | |
1424 | * FAIL_STACK_GROWTH_FACTOR)) \ | |
1425 | / sizeof (fail_stack_elt_t)), \ | |
25fe55af | 1426 | 1))) |
fa9a63c5 RM |
1427 | |
1428 | ||
fa9a63c5 RM |
1429 | /* Push a pointer value onto the failure stack. |
1430 | Assumes the variable `fail_stack'. Probably should only | |
4bb91c68 | 1431 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 | 1432 | #define PUSH_FAILURE_POINTER(item) \ |
01618498 | 1433 | fail_stack.stack[fail_stack.avail++].pointer = (item) |
fa9a63c5 RM |
1434 | |
1435 | /* This pushes an integer-valued item onto the failure stack. | |
1436 | Assumes the variable `fail_stack'. Probably should only | |
4bb91c68 | 1437 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1438 | #define PUSH_FAILURE_INT(item) \ |
1439 | fail_stack.stack[fail_stack.avail++].integer = (item) | |
1440 | ||
1441 | /* Push a fail_stack_elt_t value onto the failure stack. | |
1442 | Assumes the variable `fail_stack'. Probably should only | |
4bb91c68 | 1443 | be called from within `PUSH_FAILURE_POINT'. */ |
fa9a63c5 RM |
1444 | #define PUSH_FAILURE_ELT(item) \ |
1445 | fail_stack.stack[fail_stack.avail++] = (item) | |
1446 | ||
1447 | /* These three POP... operations complement the three PUSH... operations. | |
1448 | All assume that `fail_stack' is nonempty. */ | |
1449 | #define POP_FAILURE_POINTER() fail_stack.stack[--fail_stack.avail].pointer | |
1450 | #define POP_FAILURE_INT() fail_stack.stack[--fail_stack.avail].integer | |
1451 | #define POP_FAILURE_ELT() fail_stack.stack[--fail_stack.avail] | |
1452 | ||
505bde11 SM |
1453 | /* Individual items aside from the registers. */ |
1454 | #define NUM_NONREG_ITEMS 3 | |
1455 | ||
1456 | /* Used to examine the stack (to detect infinite loops). */ | |
1457 | #define FAILURE_PAT(h) fail_stack.stack[(h) - 1].pointer | |
66f0296e | 1458 | #define FAILURE_STR(h) (fail_stack.stack[(h) - 2].pointer) |
505bde11 SM |
1459 | #define NEXT_FAILURE_HANDLE(h) fail_stack.stack[(h) - 3].integer |
1460 | #define TOP_FAILURE_HANDLE() fail_stack.frame | |
fa9a63c5 RM |
1461 | |
1462 | ||
505bde11 SM |
1463 | #define ENSURE_FAIL_STACK(space) \ |
1464 | while (REMAINING_AVAIL_SLOTS <= space) { \ | |
1465 | if (!GROW_FAIL_STACK (fail_stack)) \ | |
1466 | return -2; \ | |
1467 | DEBUG_PRINT2 ("\n Doubled stack; size now: %d\n", (fail_stack).size);\ | |
1468 | DEBUG_PRINT2 (" slots available: %d\n", REMAINING_AVAIL_SLOTS);\ | |
1469 | } | |
1470 | ||
1471 | /* Push register NUM onto the stack. */ | |
1472 | #define PUSH_FAILURE_REG(num) \ | |
1473 | do { \ | |
1474 | char *destination; \ | |
1475 | ENSURE_FAIL_STACK(3); \ | |
1476 | DEBUG_PRINT4 (" Push reg %d (spanning %p -> %p)\n", \ | |
1477 | num, regstart[num], regend[num]); \ | |
1478 | PUSH_FAILURE_POINTER (regstart[num]); \ | |
1479 | PUSH_FAILURE_POINTER (regend[num]); \ | |
1480 | PUSH_FAILURE_INT (num); \ | |
1481 | } while (0) | |
1482 | ||
01618498 SM |
1483 | /* Change the counter's value to VAL, but make sure that it will |
1484 | be reset when backtracking. */ | |
1485 | #define PUSH_NUMBER(ptr,val) \ | |
dc1e502d SM |
1486 | do { \ |
1487 | char *destination; \ | |
1488 | int c; \ | |
1489 | ENSURE_FAIL_STACK(3); \ | |
1490 | EXTRACT_NUMBER (c, ptr); \ | |
01618498 | 1491 | DEBUG_PRINT4 (" Push number %p = %d -> %d\n", ptr, c, val); \ |
dc1e502d SM |
1492 | PUSH_FAILURE_INT (c); \ |
1493 | PUSH_FAILURE_POINTER (ptr); \ | |
1494 | PUSH_FAILURE_INT (-1); \ | |
01618498 | 1495 | STORE_NUMBER (ptr, val); \ |
dc1e502d SM |
1496 | } while (0) |
1497 | ||
505bde11 | 1498 | /* Pop a saved register off the stack. */ |
dc1e502d | 1499 | #define POP_FAILURE_REG_OR_COUNT() \ |
505bde11 SM |
1500 | do { \ |
1501 | int reg = POP_FAILURE_INT (); \ | |
dc1e502d SM |
1502 | if (reg == -1) \ |
1503 | { \ | |
1504 | /* It's a counter. */ \ | |
6dcf2d0e SM |
1505 | /* Here, we discard `const', making re_match non-reentrant. */ \ |
1506 | unsigned char *ptr = (unsigned char*) POP_FAILURE_POINTER (); \ | |
dc1e502d SM |
1507 | reg = POP_FAILURE_INT (); \ |
1508 | STORE_NUMBER (ptr, reg); \ | |
1509 | DEBUG_PRINT3 (" Pop counter %p = %d\n", ptr, reg); \ | |
1510 | } \ | |
1511 | else \ | |
1512 | { \ | |
1513 | regend[reg] = POP_FAILURE_POINTER (); \ | |
1514 | regstart[reg] = POP_FAILURE_POINTER (); \ | |
1515 | DEBUG_PRINT4 (" Pop reg %d (spanning %p -> %p)\n", \ | |
1516 | reg, regstart[reg], regend[reg]); \ | |
1517 | } \ | |
505bde11 SM |
1518 | } while (0) |
1519 | ||
1520 | /* Check that we are not stuck in an infinite loop. */ | |
1521 | #define CHECK_INFINITE_LOOP(pat_cur, string_place) \ | |
1522 | do { \ | |
f6df485f | 1523 | int failure = TOP_FAILURE_HANDLE (); \ |
505bde11 | 1524 | /* Check for infinite matching loops */ \ |
f6df485f RS |
1525 | while (failure > 0 \ |
1526 | && (FAILURE_STR (failure) == string_place \ | |
1527 | || FAILURE_STR (failure) == NULL)) \ | |
505bde11 SM |
1528 | { \ |
1529 | assert (FAILURE_PAT (failure) >= bufp->buffer \ | |
66f0296e | 1530 | && FAILURE_PAT (failure) <= bufp->buffer + bufp->used); \ |
505bde11 | 1531 | if (FAILURE_PAT (failure) == pat_cur) \ |
f6df485f | 1532 | { \ |
6df42991 SM |
1533 | cycle = 1; \ |
1534 | break; \ | |
f6df485f | 1535 | } \ |
66f0296e | 1536 | DEBUG_PRINT2 (" Other pattern: %p\n", FAILURE_PAT (failure)); \ |
505bde11 SM |
1537 | failure = NEXT_FAILURE_HANDLE(failure); \ |
1538 | } \ | |
1539 | DEBUG_PRINT2 (" Other string: %p\n", FAILURE_STR (failure)); \ | |
1540 | } while (0) | |
6df42991 | 1541 | |
fa9a63c5 | 1542 | /* Push the information about the state we will need |
5e69f11e RM |
1543 | if we ever fail back to it. |
1544 | ||
505bde11 | 1545 | Requires variables fail_stack, regstart, regend and |
320a2a73 | 1546 | num_regs be declared. GROW_FAIL_STACK requires `destination' be |
fa9a63c5 | 1547 | declared. |
5e69f11e | 1548 | |
fa9a63c5 RM |
1549 | Does `return FAILURE_CODE' if runs out of memory. */ |
1550 | ||
505bde11 SM |
1551 | #define PUSH_FAILURE_POINT(pattern, string_place) \ |
1552 | do { \ | |
1553 | char *destination; \ | |
1554 | /* Must be int, so when we don't save any registers, the arithmetic \ | |
1555 | of 0 + -1 isn't done as unsigned. */ \ | |
1556 | \ | |
505bde11 | 1557 | DEBUG_STATEMENT (nfailure_points_pushed++); \ |
4bb91c68 | 1558 | DEBUG_PRINT1 ("\nPUSH_FAILURE_POINT:\n"); \ |
505bde11 SM |
1559 | DEBUG_PRINT2 (" Before push, next avail: %d\n", (fail_stack).avail); \ |
1560 | DEBUG_PRINT2 (" size: %d\n", (fail_stack).size);\ | |
1561 | \ | |
1562 | ENSURE_FAIL_STACK (NUM_NONREG_ITEMS); \ | |
1563 | \ | |
1564 | DEBUG_PRINT1 ("\n"); \ | |
1565 | \ | |
1566 | DEBUG_PRINT2 (" Push frame index: %d\n", fail_stack.frame); \ | |
1567 | PUSH_FAILURE_INT (fail_stack.frame); \ | |
1568 | \ | |
1569 | DEBUG_PRINT2 (" Push string %p: `", string_place); \ | |
1570 | DEBUG_PRINT_DOUBLE_STRING (string_place, string1, size1, string2, size2);\ | |
1571 | DEBUG_PRINT1 ("'\n"); \ | |
1572 | PUSH_FAILURE_POINTER (string_place); \ | |
1573 | \ | |
1574 | DEBUG_PRINT2 (" Push pattern %p: ", pattern); \ | |
1575 | DEBUG_PRINT_COMPILED_PATTERN (bufp, pattern, pend); \ | |
1576 | PUSH_FAILURE_POINTER (pattern); \ | |
1577 | \ | |
1578 | /* Close the frame by moving the frame pointer past it. */ \ | |
1579 | fail_stack.frame = fail_stack.avail; \ | |
1580 | } while (0) | |
fa9a63c5 | 1581 | |
320a2a73 KH |
1582 | /* Estimate the size of data pushed by a typical failure stack entry. |
1583 | An estimate is all we need, because all we use this for | |
1584 | is to choose a limit for how big to make the failure stack. */ | |
ada30c0e | 1585 | /* BEWARE, the value `20' is hard-coded in emacs.c:main(). */ |
320a2a73 | 1586 | #define TYPICAL_FAILURE_SIZE 20 |
fa9a63c5 | 1587 | |
fa9a63c5 RM |
1588 | /* How many items can still be added to the stack without overflowing it. */ |
1589 | #define REMAINING_AVAIL_SLOTS ((fail_stack).size - (fail_stack).avail) | |
1590 | ||
1591 | ||
1592 | /* Pops what PUSH_FAIL_STACK pushes. | |
1593 | ||
1594 | We restore into the parameters, all of which should be lvalues: | |
1595 | STR -- the saved data position. | |
1596 | PAT -- the saved pattern position. | |
fa9a63c5 | 1597 | REGSTART, REGEND -- arrays of string positions. |
5e69f11e | 1598 | |
fa9a63c5 | 1599 | Also assumes the variables `fail_stack' and (if debugging), `bufp', |
25fe55af | 1600 | `pend', `string1', `size1', `string2', and `size2'. */ |
fa9a63c5 | 1601 | |
505bde11 SM |
1602 | #define POP_FAILURE_POINT(str, pat) \ |
1603 | do { \ | |
fa9a63c5 RM |
1604 | assert (!FAIL_STACK_EMPTY ()); \ |
1605 | \ | |
1606 | /* Remove failure points and point to how many regs pushed. */ \ | |
1607 | DEBUG_PRINT1 ("POP_FAILURE_POINT:\n"); \ | |
1608 | DEBUG_PRINT2 (" Before pop, next avail: %d\n", fail_stack.avail); \ | |
25fe55af | 1609 | DEBUG_PRINT2 (" size: %d\n", fail_stack.size); \ |
fa9a63c5 | 1610 | \ |
505bde11 SM |
1611 | /* Pop the saved registers. */ \ |
1612 | while (fail_stack.frame < fail_stack.avail) \ | |
dc1e502d | 1613 | POP_FAILURE_REG_OR_COUNT (); \ |
fa9a63c5 | 1614 | \ |
01618498 | 1615 | pat = POP_FAILURE_POINTER (); \ |
505bde11 SM |
1616 | DEBUG_PRINT2 (" Popping pattern %p: ", pat); \ |
1617 | DEBUG_PRINT_COMPILED_PATTERN (bufp, pat, pend); \ | |
fa9a63c5 RM |
1618 | \ |
1619 | /* If the saved string location is NULL, it came from an \ | |
1620 | on_failure_keep_string_jump opcode, and we want to throw away the \ | |
1621 | saved NULL, thus retaining our current position in the string. */ \ | |
01618498 | 1622 | str = POP_FAILURE_POINTER (); \ |
505bde11 | 1623 | DEBUG_PRINT2 (" Popping string %p: `", str); \ |
fa9a63c5 RM |
1624 | DEBUG_PRINT_DOUBLE_STRING (str, string1, size1, string2, size2); \ |
1625 | DEBUG_PRINT1 ("'\n"); \ | |
1626 | \ | |
505bde11 SM |
1627 | fail_stack.frame = POP_FAILURE_INT (); \ |
1628 | DEBUG_PRINT2 (" Popping frame index: %d\n", fail_stack.frame); \ | |
fa9a63c5 | 1629 | \ |
505bde11 SM |
1630 | assert (fail_stack.avail >= 0); \ |
1631 | assert (fail_stack.frame <= fail_stack.avail); \ | |
fa9a63c5 | 1632 | \ |
fa9a63c5 | 1633 | DEBUG_STATEMENT (nfailure_points_popped++); \ |
505bde11 | 1634 | } while (0) /* POP_FAILURE_POINT */ |
fa9a63c5 RM |
1635 | |
1636 | ||
1637 | \f | |
fa9a63c5 | 1638 | /* Registers are set to a sentinel when they haven't yet matched. */ |
4bb91c68 | 1639 | #define REG_UNSET(e) ((e) == NULL) |
fa9a63c5 RM |
1640 | \f |
1641 | /* Subroutine declarations and macros for regex_compile. */ | |
1642 | ||
4bb91c68 SM |
1643 | static reg_errcode_t regex_compile _RE_ARGS ((re_char *pattern, size_t size, |
1644 | reg_syntax_t syntax, | |
1645 | struct re_pattern_buffer *bufp)); | |
1646 | static void store_op1 _RE_ARGS ((re_opcode_t op, unsigned char *loc, int arg)); | |
1647 | static void store_op2 _RE_ARGS ((re_opcode_t op, unsigned char *loc, | |
1648 | int arg1, int arg2)); | |
1649 | static void insert_op1 _RE_ARGS ((re_opcode_t op, unsigned char *loc, | |
1650 | int arg, unsigned char *end)); | |
1651 | static void insert_op2 _RE_ARGS ((re_opcode_t op, unsigned char *loc, | |
1652 | int arg1, int arg2, unsigned char *end)); | |
01618498 SM |
1653 | static boolean at_begline_loc_p _RE_ARGS ((re_char *pattern, |
1654 | re_char *p, | |
4bb91c68 | 1655 | reg_syntax_t syntax)); |
01618498 SM |
1656 | static boolean at_endline_loc_p _RE_ARGS ((re_char *p, |
1657 | re_char *pend, | |
4bb91c68 | 1658 | reg_syntax_t syntax)); |
01618498 SM |
1659 | static re_char *skip_one_char _RE_ARGS ((re_char *p)); |
1660 | static int analyse_first _RE_ARGS ((re_char *p, re_char *pend, | |
4bb91c68 | 1661 | char *fastmap, const int multibyte)); |
fa9a63c5 | 1662 | |
fa9a63c5 | 1663 | /* Fetch the next character in the uncompiled pattern, with no |
4bb91c68 | 1664 | translation. */ |
36595814 | 1665 | #define PATFETCH(c) \ |
2d1675e4 SM |
1666 | do { \ |
1667 | int len; \ | |
1668 | if (p == pend) return REG_EEND; \ | |
1669 | c = RE_STRING_CHAR_AND_LENGTH (p, pend - p, len); \ | |
1670 | p += len; \ | |
fa9a63c5 RM |
1671 | } while (0) |
1672 | ||
fa9a63c5 RM |
1673 | |
1674 | /* If `translate' is non-null, return translate[D], else just D. We | |
1675 | cast the subscript to translate because some data is declared as | |
1676 | `char *', to avoid warnings when a string constant is passed. But | |
1677 | when we use a character as a subscript we must make it unsigned. */ | |
6676cb1c | 1678 | #ifndef TRANSLATE |
0b32bf0e | 1679 | # define TRANSLATE(d) \ |
66f0296e | 1680 | (RE_TRANSLATE_P (translate) ? RE_TRANSLATE (translate, (d)) : (d)) |
6676cb1c | 1681 | #endif |
fa9a63c5 RM |
1682 | |
1683 | ||
1684 | /* Macros for outputting the compiled pattern into `buffer'. */ | |
1685 | ||
1686 | /* If the buffer isn't allocated when it comes in, use this. */ | |
1687 | #define INIT_BUF_SIZE 32 | |
1688 | ||
4bb91c68 | 1689 | /* Make sure we have at least N more bytes of space in buffer. */ |
fa9a63c5 | 1690 | #define GET_BUFFER_SPACE(n) \ |
01618498 | 1691 | while ((size_t) (b - bufp->buffer + (n)) > bufp->allocated) \ |
fa9a63c5 RM |
1692 | EXTEND_BUFFER () |
1693 | ||
1694 | /* Make sure we have one more byte of buffer space and then add C to it. */ | |
1695 | #define BUF_PUSH(c) \ | |
1696 | do { \ | |
1697 | GET_BUFFER_SPACE (1); \ | |
1698 | *b++ = (unsigned char) (c); \ | |
1699 | } while (0) | |
1700 | ||
1701 | ||
1702 | /* Ensure we have two more bytes of buffer space and then append C1 and C2. */ | |
1703 | #define BUF_PUSH_2(c1, c2) \ | |
1704 | do { \ | |
1705 | GET_BUFFER_SPACE (2); \ | |
1706 | *b++ = (unsigned char) (c1); \ | |
1707 | *b++ = (unsigned char) (c2); \ | |
1708 | } while (0) | |
1709 | ||
1710 | ||
4bb91c68 | 1711 | /* As with BUF_PUSH_2, except for three bytes. */ |
fa9a63c5 RM |
1712 | #define BUF_PUSH_3(c1, c2, c3) \ |
1713 | do { \ | |
1714 | GET_BUFFER_SPACE (3); \ | |
1715 | *b++ = (unsigned char) (c1); \ | |
1716 | *b++ = (unsigned char) (c2); \ | |
1717 | *b++ = (unsigned char) (c3); \ | |
1718 | } while (0) | |
1719 | ||
1720 | ||
1721 | /* Store a jump with opcode OP at LOC to location TO. We store a | |
4bb91c68 | 1722 | relative address offset by the three bytes the jump itself occupies. */ |
fa9a63c5 RM |
1723 | #define STORE_JUMP(op, loc, to) \ |
1724 | store_op1 (op, loc, (to) - (loc) - 3) | |
1725 | ||
1726 | /* Likewise, for a two-argument jump. */ | |
1727 | #define STORE_JUMP2(op, loc, to, arg) \ | |
1728 | store_op2 (op, loc, (to) - (loc) - 3, arg) | |
1729 | ||
4bb91c68 | 1730 | /* Like `STORE_JUMP', but for inserting. Assume `b' is the buffer end. */ |
fa9a63c5 RM |
1731 | #define INSERT_JUMP(op, loc, to) \ |
1732 | insert_op1 (op, loc, (to) - (loc) - 3, b) | |
1733 | ||
1734 | /* Like `STORE_JUMP2', but for inserting. Assume `b' is the buffer end. */ | |
1735 | #define INSERT_JUMP2(op, loc, to, arg) \ | |
1736 | insert_op2 (op, loc, (to) - (loc) - 3, arg, b) | |
1737 | ||
1738 | ||
1739 | /* This is not an arbitrary limit: the arguments which represent offsets | |
4bb91c68 | 1740 | into the pattern are two bytes long. So if 2^16 bytes turns out to |
fa9a63c5 | 1741 | be too small, many things would have to change. */ |
4bb91c68 SM |
1742 | /* Any other compiler which, like MSC, has allocation limit below 2^16 |
1743 | bytes will have to use approach similar to what was done below for | |
1744 | MSC and drop MAX_BUF_SIZE a bit. Otherwise you may end up | |
1745 | reallocating to 0 bytes. Such thing is not going to work too well. | |
1746 | You have been warned!! */ | |
1747 | #if defined _MSC_VER && !defined WIN32 | |
1748 | /* Microsoft C 16-bit versions limit malloc to approx 65512 bytes. */ | |
1749 | # define MAX_BUF_SIZE 65500L | |
1750 | #else | |
1751 | # define MAX_BUF_SIZE (1L << 16) | |
1752 | #endif | |
fa9a63c5 RM |
1753 | |
1754 | /* Extend the buffer by twice its current size via realloc and | |
1755 | reset the pointers that pointed into the old block to point to the | |
1756 | correct places in the new one. If extending the buffer results in it | |
4bb91c68 SM |
1757 | being larger than MAX_BUF_SIZE, then flag memory exhausted. */ |
1758 | #if __BOUNDED_POINTERS__ | |
1759 | # define SET_HIGH_BOUND(P) (__ptrhigh (P) = __ptrlow (P) + bufp->allocated) | |
1760 | # define MOVE_BUFFER_POINTER(P) \ | |
1761 | (__ptrlow (P) += incr, SET_HIGH_BOUND (P), __ptrvalue (P) += incr) | |
1762 | # define ELSE_EXTEND_BUFFER_HIGH_BOUND \ | |
1763 | else \ | |
1764 | { \ | |
1765 | SET_HIGH_BOUND (b); \ | |
1766 | SET_HIGH_BOUND (begalt); \ | |
1767 | if (fixup_alt_jump) \ | |
1768 | SET_HIGH_BOUND (fixup_alt_jump); \ | |
1769 | if (laststart) \ | |
1770 | SET_HIGH_BOUND (laststart); \ | |
1771 | if (pending_exact) \ | |
1772 | SET_HIGH_BOUND (pending_exact); \ | |
1773 | } | |
1774 | #else | |
1775 | # define MOVE_BUFFER_POINTER(P) (P) += incr | |
1776 | # define ELSE_EXTEND_BUFFER_HIGH_BOUND | |
1777 | #endif | |
fa9a63c5 | 1778 | #define EXTEND_BUFFER() \ |
25fe55af | 1779 | do { \ |
01618498 | 1780 | re_char *old_buffer = bufp->buffer; \ |
25fe55af | 1781 | if (bufp->allocated == MAX_BUF_SIZE) \ |
fa9a63c5 RM |
1782 | return REG_ESIZE; \ |
1783 | bufp->allocated <<= 1; \ | |
1784 | if (bufp->allocated > MAX_BUF_SIZE) \ | |
25fe55af | 1785 | bufp->allocated = MAX_BUF_SIZE; \ |
01618498 | 1786 | RETALLOC (bufp->buffer, bufp->allocated, unsigned char); \ |
fa9a63c5 RM |
1787 | if (bufp->buffer == NULL) \ |
1788 | return REG_ESPACE; \ | |
1789 | /* If the buffer moved, move all the pointers into it. */ \ | |
1790 | if (old_buffer != bufp->buffer) \ | |
1791 | { \ | |
4bb91c68 SM |
1792 | int incr = bufp->buffer - old_buffer; \ |
1793 | MOVE_BUFFER_POINTER (b); \ | |
1794 | MOVE_BUFFER_POINTER (begalt); \ | |
25fe55af | 1795 | if (fixup_alt_jump) \ |
4bb91c68 | 1796 | MOVE_BUFFER_POINTER (fixup_alt_jump); \ |
25fe55af | 1797 | if (laststart) \ |
4bb91c68 | 1798 | MOVE_BUFFER_POINTER (laststart); \ |
25fe55af | 1799 | if (pending_exact) \ |
4bb91c68 | 1800 | MOVE_BUFFER_POINTER (pending_exact); \ |
fa9a63c5 | 1801 | } \ |
4bb91c68 | 1802 | ELSE_EXTEND_BUFFER_HIGH_BOUND \ |
fa9a63c5 RM |
1803 | } while (0) |
1804 | ||
1805 | ||
1806 | /* Since we have one byte reserved for the register number argument to | |
1807 | {start,stop}_memory, the maximum number of groups we can report | |
1808 | things about is what fits in that byte. */ | |
1809 | #define MAX_REGNUM 255 | |
1810 | ||
1811 | /* But patterns can have more than `MAX_REGNUM' registers. We just | |
1812 | ignore the excess. */ | |
098d42af | 1813 | typedef int regnum_t; |
fa9a63c5 RM |
1814 | |
1815 | ||
1816 | /* Macros for the compile stack. */ | |
1817 | ||
1818 | /* Since offsets can go either forwards or backwards, this type needs to | |
4bb91c68 SM |
1819 | be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1. */ |
1820 | /* int may be not enough when sizeof(int) == 2. */ | |
1821 | typedef long pattern_offset_t; | |
fa9a63c5 RM |
1822 | |
1823 | typedef struct | |
1824 | { | |
1825 | pattern_offset_t begalt_offset; | |
1826 | pattern_offset_t fixup_alt_jump; | |
5e69f11e | 1827 | pattern_offset_t laststart_offset; |
fa9a63c5 RM |
1828 | regnum_t regnum; |
1829 | } compile_stack_elt_t; | |
1830 | ||
1831 | ||
1832 | typedef struct | |
1833 | { | |
1834 | compile_stack_elt_t *stack; | |
1835 | unsigned size; | |
1836 | unsigned avail; /* Offset of next open position. */ | |
1837 | } compile_stack_type; | |
1838 | ||
1839 | ||
1840 | #define INIT_COMPILE_STACK_SIZE 32 | |
1841 | ||
1842 | #define COMPILE_STACK_EMPTY (compile_stack.avail == 0) | |
1843 | #define COMPILE_STACK_FULL (compile_stack.avail == compile_stack.size) | |
1844 | ||
4bb91c68 | 1845 | /* The next available element. */ |
fa9a63c5 RM |
1846 | #define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail]) |
1847 | ||
77d11aec RS |
1848 | /* Explicit quit checking is only used on NTemacs. */ |
1849 | #if defined WINDOWSNT && defined emacs && defined QUIT | |
1850 | extern int immediate_quit; | |
1851 | # define IMMEDIATE_QUIT_CHECK \ | |
1852 | do { \ | |
1853 | if (immediate_quit) QUIT; \ | |
1854 | } while (0) | |
1855 | #else | |
1856 | # define IMMEDIATE_QUIT_CHECK ((void)0) | |
1857 | #endif | |
1858 | \f | |
b18215fc RS |
1859 | /* Structure to manage work area for range table. */ |
1860 | struct range_table_work_area | |
1861 | { | |
1862 | int *table; /* actual work area. */ | |
1863 | int allocated; /* allocated size for work area in bytes. */ | |
25fe55af | 1864 | int used; /* actually used size in words. */ |
96cc36cc | 1865 | int bits; /* flag to record character classes */ |
b18215fc RS |
1866 | }; |
1867 | ||
77d11aec RS |
1868 | /* Make sure that WORK_AREA can hold more N multibyte characters. |
1869 | This is used only in set_image_of_range and set_image_of_range_1. | |
1870 | It expects WORK_AREA to be a pointer. | |
1871 | If it can't get the space, it returns from the surrounding function. */ | |
1872 | ||
1873 | #define EXTEND_RANGE_TABLE(work_area, n) \ | |
1874 | do { \ | |
1875 | if (((work_area)->used + (n)) * sizeof (int) > (work_area)->allocated) \ | |
1876 | { \ | |
1877 | extend_range_table_work_area (work_area); \ | |
1878 | if ((work_area)->table == 0) \ | |
1879 | return (REG_ESPACE); \ | |
1880 | } \ | |
b18215fc RS |
1881 | } while (0) |
1882 | ||
96cc36cc RS |
1883 | #define SET_RANGE_TABLE_WORK_AREA_BIT(work_area, bit) \ |
1884 | (work_area).bits |= (bit) | |
1885 | ||
14473664 SM |
1886 | /* Bits used to implement the multibyte-part of the various character classes |
1887 | such as [:alnum:] in a charset's range table. */ | |
1888 | #define BIT_WORD 0x1 | |
1889 | #define BIT_LOWER 0x2 | |
1890 | #define BIT_PUNCT 0x4 | |
1891 | #define BIT_SPACE 0x8 | |
1892 | #define BIT_UPPER 0x10 | |
1893 | #define BIT_MULTIBYTE 0x20 | |
96cc36cc | 1894 | |
36595814 SM |
1895 | /* Set a range START..END to WORK_AREA. |
1896 | The range is passed through TRANSLATE, so START and END | |
1897 | should be untranslated. */ | |
77d11aec RS |
1898 | #define SET_RANGE_TABLE_WORK_AREA(work_area, start, end) \ |
1899 | do { \ | |
1900 | int tem; \ | |
1901 | tem = set_image_of_range (&work_area, start, end, translate); \ | |
1902 | if (tem > 0) \ | |
1903 | FREE_STACK_RETURN (tem); \ | |
b18215fc RS |
1904 | } while (0) |
1905 | ||
25fe55af | 1906 | /* Free allocated memory for WORK_AREA. */ |
b18215fc RS |
1907 | #define FREE_RANGE_TABLE_WORK_AREA(work_area) \ |
1908 | do { \ | |
1909 | if ((work_area).table) \ | |
1910 | free ((work_area).table); \ | |
1911 | } while (0) | |
1912 | ||
96cc36cc | 1913 | #define CLEAR_RANGE_TABLE_WORK_USED(work_area) ((work_area).used = 0, (work_area).bits = 0) |
b18215fc | 1914 | #define RANGE_TABLE_WORK_USED(work_area) ((work_area).used) |
96cc36cc | 1915 | #define RANGE_TABLE_WORK_BITS(work_area) ((work_area).bits) |
b18215fc | 1916 | #define RANGE_TABLE_WORK_ELT(work_area, i) ((work_area).table[i]) |
77d11aec | 1917 | \f |
b18215fc | 1918 | |
fa9a63c5 | 1919 | /* Set the bit for character C in a list. */ |
01618498 | 1920 | #define SET_LIST_BIT(c) (b[((c)) / BYTEWIDTH] |= 1 << ((c) % BYTEWIDTH)) |
fa9a63c5 RM |
1921 | |
1922 | ||
1923 | /* Get the next unsigned number in the uncompiled pattern. */ | |
25fe55af | 1924 | #define GET_UNSIGNED_NUMBER(num) \ |
99633e97 | 1925 | do { if (p != pend) \ |
fa9a63c5 | 1926 | { \ |
25fe55af | 1927 | PATFETCH (c); \ |
060cc8ff RS |
1928 | if (c == ' ') \ |
1929 | FREE_STACK_RETURN (REG_BADBR); \ | |
4bb91c68 | 1930 | while ('0' <= c && c <= '9') \ |
25fe55af | 1931 | { \ |
f6df485f | 1932 | int prev; \ |
25fe55af | 1933 | if (num < 0) \ |
f6df485f RS |
1934 | num = 0; \ |
1935 | prev = num; \ | |
25fe55af | 1936 | num = num * 10 + c - '0'; \ |
f6df485f RS |
1937 | if (num / 10 != prev) \ |
1938 | FREE_STACK_RETURN (REG_BADBR); \ | |
25fe55af | 1939 | if (p == pend) \ |
f6df485f | 1940 | break; \ |
25fe55af RS |
1941 | PATFETCH (c); \ |
1942 | } \ | |
060cc8ff RS |
1943 | if (c == ' ') \ |
1944 | FREE_STACK_RETURN (REG_BADBR); \ | |
25fe55af | 1945 | } \ |
99633e97 | 1946 | } while (0) |
77d11aec | 1947 | \f |
a0ad02f7 | 1948 | #if WIDE_CHAR_SUPPORT |
14473664 SM |
1949 | /* The GNU C library provides support for user-defined character classes |
1950 | and the functions from ISO C amendement 1. */ | |
1951 | # ifdef CHARCLASS_NAME_MAX | |
1952 | # define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX | |
1953 | # else | |
1954 | /* This shouldn't happen but some implementation might still have this | |
1955 | problem. Use a reasonable default value. */ | |
1956 | # define CHAR_CLASS_MAX_LENGTH 256 | |
1957 | # endif | |
1958 | typedef wctype_t re_wctype_t; | |
01618498 | 1959 | typedef wchar_t re_wchar_t; |
14473664 SM |
1960 | # define re_wctype wctype |
1961 | # define re_iswctype iswctype | |
1962 | # define re_wctype_to_bit(cc) 0 | |
1963 | #else | |
1964 | # define CHAR_CLASS_MAX_LENGTH 9 /* Namely, `multibyte'. */ | |
1965 | # define btowc(c) c | |
1966 | ||
01618498 | 1967 | /* Character classes. */ |
14473664 SM |
1968 | typedef enum { RECC_ERROR = 0, |
1969 | RECC_ALNUM, RECC_ALPHA, RECC_WORD, | |
1970 | RECC_GRAPH, RECC_PRINT, | |
1971 | RECC_LOWER, RECC_UPPER, | |
1972 | RECC_PUNCT, RECC_CNTRL, | |
1973 | RECC_DIGIT, RECC_XDIGIT, | |
1974 | RECC_BLANK, RECC_SPACE, | |
1975 | RECC_MULTIBYTE, RECC_NONASCII, | |
1976 | RECC_ASCII, RECC_UNIBYTE | |
1977 | } re_wctype_t; | |
1978 | ||
01618498 SM |
1979 | typedef int re_wchar_t; |
1980 | ||
14473664 SM |
1981 | /* Map a string to the char class it names (if any). */ |
1982 | static re_wctype_t | |
ada30c0e SM |
1983 | re_wctype (str) |
1984 | re_char *str; | |
14473664 | 1985 | { |
ada30c0e | 1986 | const char *string = str; |
14473664 SM |
1987 | if (STREQ (string, "alnum")) return RECC_ALNUM; |
1988 | else if (STREQ (string, "alpha")) return RECC_ALPHA; | |
1989 | else if (STREQ (string, "word")) return RECC_WORD; | |
1990 | else if (STREQ (string, "ascii")) return RECC_ASCII; | |
1991 | else if (STREQ (string, "nonascii")) return RECC_NONASCII; | |
1992 | else if (STREQ (string, "graph")) return RECC_GRAPH; | |
1993 | else if (STREQ (string, "lower")) return RECC_LOWER; | |
1994 | else if (STREQ (string, "print")) return RECC_PRINT; | |
1995 | else if (STREQ (string, "punct")) return RECC_PUNCT; | |
1996 | else if (STREQ (string, "space")) return RECC_SPACE; | |
1997 | else if (STREQ (string, "upper")) return RECC_UPPER; | |
1998 | else if (STREQ (string, "unibyte")) return RECC_UNIBYTE; | |
1999 | else if (STREQ (string, "multibyte")) return RECC_MULTIBYTE; | |
2000 | else if (STREQ (string, "digit")) return RECC_DIGIT; | |
2001 | else if (STREQ (string, "xdigit")) return RECC_XDIGIT; | |
2002 | else if (STREQ (string, "cntrl")) return RECC_CNTRL; | |
2003 | else if (STREQ (string, "blank")) return RECC_BLANK; | |
2004 | else return 0; | |
2005 | } | |
2006 | ||
2007 | /* True iff CH is in the char class CC. */ | |
2008 | static boolean | |
2009 | re_iswctype (ch, cc) | |
2010 | int ch; | |
2011 | re_wctype_t cc; | |
2012 | { | |
2013 | switch (cc) | |
2014 | { | |
0cdd06f8 SM |
2015 | case RECC_ALNUM: return ISALNUM (ch); |
2016 | case RECC_ALPHA: return ISALPHA (ch); | |
2017 | case RECC_BLANK: return ISBLANK (ch); | |
2018 | case RECC_CNTRL: return ISCNTRL (ch); | |
2019 | case RECC_DIGIT: return ISDIGIT (ch); | |
2020 | case RECC_GRAPH: return ISGRAPH (ch); | |
2021 | case RECC_LOWER: return ISLOWER (ch); | |
2022 | case RECC_PRINT: return ISPRINT (ch); | |
2023 | case RECC_PUNCT: return ISPUNCT (ch); | |
2024 | case RECC_SPACE: return ISSPACE (ch); | |
2025 | case RECC_UPPER: return ISUPPER (ch); | |
2026 | case RECC_XDIGIT: return ISXDIGIT (ch); | |
2027 | case RECC_ASCII: return IS_REAL_ASCII (ch); | |
2028 | case RECC_NONASCII: return !IS_REAL_ASCII (ch); | |
2029 | case RECC_UNIBYTE: return ISUNIBYTE (ch); | |
2030 | case RECC_MULTIBYTE: return !ISUNIBYTE (ch); | |
2031 | case RECC_WORD: return ISWORD (ch); | |
2032 | case RECC_ERROR: return false; | |
2033 | default: | |
2034 | abort(); | |
14473664 SM |
2035 | } |
2036 | } | |
fa9a63c5 | 2037 | |
14473664 SM |
2038 | /* Return a bit-pattern to use in the range-table bits to match multibyte |
2039 | chars of class CC. */ | |
2040 | static int | |
2041 | re_wctype_to_bit (cc) | |
2042 | re_wctype_t cc; | |
2043 | { | |
2044 | switch (cc) | |
2045 | { | |
2046 | case RECC_NONASCII: case RECC_PRINT: case RECC_GRAPH: | |
0cdd06f8 SM |
2047 | case RECC_MULTIBYTE: return BIT_MULTIBYTE; |
2048 | case RECC_ALPHA: case RECC_ALNUM: case RECC_WORD: return BIT_WORD; | |
2049 | case RECC_LOWER: return BIT_LOWER; | |
2050 | case RECC_UPPER: return BIT_UPPER; | |
2051 | case RECC_PUNCT: return BIT_PUNCT; | |
2052 | case RECC_SPACE: return BIT_SPACE; | |
14473664 | 2053 | case RECC_ASCII: case RECC_DIGIT: case RECC_XDIGIT: case RECC_CNTRL: |
0cdd06f8 SM |
2054 | case RECC_BLANK: case RECC_UNIBYTE: case RECC_ERROR: return 0; |
2055 | default: | |
2056 | abort(); | |
14473664 SM |
2057 | } |
2058 | } | |
2059 | #endif | |
77d11aec RS |
2060 | \f |
2061 | /* Filling in the work area of a range. */ | |
2062 | ||
2063 | /* Actually extend the space in WORK_AREA. */ | |
2064 | ||
2065 | static void | |
2066 | extend_range_table_work_area (work_area) | |
2067 | struct range_table_work_area *work_area; | |
177c0ea7 | 2068 | { |
77d11aec RS |
2069 | work_area->allocated += 16 * sizeof (int); |
2070 | if (work_area->table) | |
2071 | work_area->table | |
2072 | = (int *) realloc (work_area->table, work_area->allocated); | |
2073 | else | |
2074 | work_area->table | |
2075 | = (int *) malloc (work_area->allocated); | |
2076 | } | |
2077 | ||
2078 | #ifdef emacs | |
2079 | ||
2080 | /* Carefully find the ranges of codes that are equivalent | |
2081 | under case conversion to the range start..end when passed through | |
2082 | TRANSLATE. Handle the case where non-letters can come in between | |
2083 | two upper-case letters (which happens in Latin-1). | |
2084 | Also handle the case of groups of more than 2 case-equivalent chars. | |
2085 | ||
2086 | The basic method is to look at consecutive characters and see | |
2087 | if they can form a run that can be handled as one. | |
2088 | ||
2089 | Returns -1 if successful, REG_ESPACE if ran out of space. */ | |
2090 | ||
2091 | static int | |
2092 | set_image_of_range_1 (work_area, start, end, translate) | |
2093 | RE_TRANSLATE_TYPE translate; | |
2094 | struct range_table_work_area *work_area; | |
2095 | re_wchar_t start, end; | |
2096 | { | |
2097 | /* `one_case' indicates a character, or a run of characters, | |
2098 | each of which is an isolate (no case-equivalents). | |
2099 | This includes all ASCII non-letters. | |
2100 | ||
2101 | `two_case' indicates a character, or a run of characters, | |
2102 | each of which has two case-equivalent forms. | |
2103 | This includes all ASCII letters. | |
2104 | ||
2105 | `strange' indicates a character that has more than one | |
2106 | case-equivalent. */ | |
177c0ea7 | 2107 | |
77d11aec RS |
2108 | enum case_type {one_case, two_case, strange}; |
2109 | ||
2110 | /* Describe the run that is in progress, | |
2111 | which the next character can try to extend. | |
2112 | If run_type is strange, that means there really is no run. | |
2113 | If run_type is one_case, then run_start...run_end is the run. | |
2114 | If run_type is two_case, then the run is run_start...run_end, | |
2115 | and the case-equivalents end at run_eqv_end. */ | |
2116 | ||
2117 | enum case_type run_type = strange; | |
2118 | int run_start, run_end, run_eqv_end; | |
2119 | ||
2120 | Lisp_Object eqv_table; | |
2121 | ||
2122 | if (!RE_TRANSLATE_P (translate)) | |
2123 | { | |
b7c12565 | 2124 | EXTEND_RANGE_TABLE (work_area, 2); |
77d11aec RS |
2125 | work_area->table[work_area->used++] = (start); |
2126 | work_area->table[work_area->used++] = (end); | |
b7c12565 | 2127 | return -1; |
77d11aec RS |
2128 | } |
2129 | ||
2130 | eqv_table = XCHAR_TABLE (translate)->extras[2]; | |
99633e97 | 2131 | |
77d11aec RS |
2132 | for (; start <= end; start++) |
2133 | { | |
2134 | enum case_type this_type; | |
2135 | int eqv = RE_TRANSLATE (eqv_table, start); | |
2136 | int minchar, maxchar; | |
2137 | ||
2138 | /* Classify this character */ | |
2139 | if (eqv == start) | |
2140 | this_type = one_case; | |
2141 | else if (RE_TRANSLATE (eqv_table, eqv) == start) | |
2142 | this_type = two_case; | |
2143 | else | |
2144 | this_type = strange; | |
2145 | ||
2146 | if (start < eqv) | |
2147 | minchar = start, maxchar = eqv; | |
2148 | else | |
2149 | minchar = eqv, maxchar = start; | |
2150 | ||
2151 | /* Can this character extend the run in progress? */ | |
2152 | if (this_type == strange || this_type != run_type | |
2153 | || !(minchar == run_end + 1 | |
2154 | && (run_type == two_case | |
2155 | ? maxchar == run_eqv_end + 1 : 1))) | |
2156 | { | |
2157 | /* No, end the run. | |
2158 | Record each of its equivalent ranges. */ | |
2159 | if (run_type == one_case) | |
2160 | { | |
2161 | EXTEND_RANGE_TABLE (work_area, 2); | |
2162 | work_area->table[work_area->used++] = run_start; | |
2163 | work_area->table[work_area->used++] = run_end; | |
2164 | } | |
2165 | else if (run_type == two_case) | |
2166 | { | |
2167 | EXTEND_RANGE_TABLE (work_area, 4); | |
2168 | work_area->table[work_area->used++] = run_start; | |
2169 | work_area->table[work_area->used++] = run_end; | |
2170 | work_area->table[work_area->used++] | |
2171 | = RE_TRANSLATE (eqv_table, run_start); | |
2172 | work_area->table[work_area->used++] | |
2173 | = RE_TRANSLATE (eqv_table, run_end); | |
2174 | } | |
2175 | run_type = strange; | |
2176 | } | |
177c0ea7 | 2177 | |
77d11aec RS |
2178 | if (this_type == strange) |
2179 | { | |
2180 | /* For a strange character, add each of its equivalents, one | |
2181 | by one. Don't start a range. */ | |
2182 | do | |
2183 | { | |
2184 | EXTEND_RANGE_TABLE (work_area, 2); | |
2185 | work_area->table[work_area->used++] = eqv; | |
2186 | work_area->table[work_area->used++] = eqv; | |
2187 | eqv = RE_TRANSLATE (eqv_table, eqv); | |
2188 | } | |
2189 | while (eqv != start); | |
2190 | } | |
2191 | ||
2192 | /* Add this char to the run, or start a new run. */ | |
2193 | else if (run_type == strange) | |
2194 | { | |
2195 | /* Initialize a new range. */ | |
2196 | run_type = this_type; | |
2197 | run_start = start; | |
2198 | run_end = start; | |
2199 | run_eqv_end = RE_TRANSLATE (eqv_table, run_end); | |
2200 | } | |
2201 | else | |
2202 | { | |
2203 | /* Extend a running range. */ | |
2204 | run_end = minchar; | |
2205 | run_eqv_end = RE_TRANSLATE (eqv_table, run_end); | |
2206 | } | |
2207 | } | |
2208 | ||
2209 | /* If a run is still in progress at the end, finish it now | |
2210 | by recording its equivalent ranges. */ | |
2211 | if (run_type == one_case) | |
2212 | { | |
2213 | EXTEND_RANGE_TABLE (work_area, 2); | |
2214 | work_area->table[work_area->used++] = run_start; | |
2215 | work_area->table[work_area->used++] = run_end; | |
2216 | } | |
2217 | else if (run_type == two_case) | |
2218 | { | |
2219 | EXTEND_RANGE_TABLE (work_area, 4); | |
2220 | work_area->table[work_area->used++] = run_start; | |
2221 | work_area->table[work_area->used++] = run_end; | |
2222 | work_area->table[work_area->used++] | |
2223 | = RE_TRANSLATE (eqv_table, run_start); | |
2224 | work_area->table[work_area->used++] | |
2225 | = RE_TRANSLATE (eqv_table, run_end); | |
2226 | } | |
2227 | ||
2228 | return -1; | |
2229 | } | |
36595814 | 2230 | |
77d11aec | 2231 | #endif /* emacs */ |
36595814 | 2232 | |
b7c12565 | 2233 | /* Record the the image of the range start..end when passed through |
36595814 SM |
2234 | TRANSLATE. This is not necessarily TRANSLATE(start)..TRANSLATE(end) |
2235 | and is not even necessarily contiguous. | |
b7c12565 RS |
2236 | Normally we approximate it with the smallest contiguous range that contains |
2237 | all the chars we need. However, for Latin-1 we go to extra effort | |
2238 | to do a better job. | |
2239 | ||
2240 | This function is not called for ASCII ranges. | |
77d11aec RS |
2241 | |
2242 | Returns -1 if successful, REG_ESPACE if ran out of space. */ | |
2243 | ||
2244 | static int | |
36595814 SM |
2245 | set_image_of_range (work_area, start, end, translate) |
2246 | RE_TRANSLATE_TYPE translate; | |
2247 | struct range_table_work_area *work_area; | |
2248 | re_wchar_t start, end; | |
2249 | { | |
77d11aec RS |
2250 | re_wchar_t cmin, cmax; |
2251 | ||
2252 | #ifdef emacs | |
2253 | /* For Latin-1 ranges, use set_image_of_range_1 | |
2254 | to get proper handling of ranges that include letters and nonletters. | |
b7c12565 | 2255 | For a range that includes the whole of Latin-1, this is not necessary. |
77d11aec | 2256 | For other character sets, we don't bother to get this right. */ |
b7c12565 RS |
2257 | if (RE_TRANSLATE_P (translate) && start < 04400 |
2258 | && !(start < 04200 && end >= 04377)) | |
77d11aec | 2259 | { |
b7c12565 | 2260 | int newend; |
77d11aec | 2261 | int tem; |
b7c12565 RS |
2262 | newend = end; |
2263 | if (newend > 04377) | |
2264 | newend = 04377; | |
2265 | tem = set_image_of_range_1 (work_area, start, newend, translate); | |
77d11aec RS |
2266 | if (tem > 0) |
2267 | return tem; | |
2268 | ||
2269 | start = 04400; | |
2270 | if (end < 04400) | |
2271 | return -1; | |
2272 | } | |
2273 | #endif | |
2274 | ||
b7c12565 RS |
2275 | EXTEND_RANGE_TABLE (work_area, 2); |
2276 | work_area->table[work_area->used++] = (start); | |
2277 | work_area->table[work_area->used++] = (end); | |
2278 | ||
2279 | cmin = -1, cmax = -1; | |
77d11aec | 2280 | |
36595814 | 2281 | if (RE_TRANSLATE_P (translate)) |
b7c12565 RS |
2282 | { |
2283 | int ch; | |
77d11aec | 2284 | |
b7c12565 RS |
2285 | for (ch = start; ch <= end; ch++) |
2286 | { | |
2287 | re_wchar_t c = TRANSLATE (ch); | |
2288 | if (! (start <= c && c <= end)) | |
2289 | { | |
2290 | if (cmin == -1) | |
2291 | cmin = c, cmax = c; | |
2292 | else | |
2293 | { | |
2294 | cmin = MIN (cmin, c); | |
2295 | cmax = MAX (cmax, c); | |
2296 | } | |
2297 | } | |
2298 | } | |
2299 | ||
2300 | if (cmin != -1) | |
2301 | { | |
2302 | EXTEND_RANGE_TABLE (work_area, 2); | |
2303 | work_area->table[work_area->used++] = (cmin); | |
2304 | work_area->table[work_area->used++] = (cmax); | |
2305 | } | |
2306 | } | |
36595814 | 2307 | |
77d11aec RS |
2308 | return -1; |
2309 | } | |
fa9a63c5 RM |
2310 | \f |
2311 | #ifndef MATCH_MAY_ALLOCATE | |
2312 | ||
2313 | /* If we cannot allocate large objects within re_match_2_internal, | |
2314 | we make the fail stack and register vectors global. | |
2315 | The fail stack, we grow to the maximum size when a regexp | |
2316 | is compiled. | |
2317 | The register vectors, we adjust in size each time we | |
2318 | compile a regexp, according to the number of registers it needs. */ | |
2319 | ||
2320 | static fail_stack_type fail_stack; | |
2321 | ||
2322 | /* Size with which the following vectors are currently allocated. | |
2323 | That is so we can make them bigger as needed, | |
4bb91c68 | 2324 | but never make them smaller. */ |
fa9a63c5 RM |
2325 | static int regs_allocated_size; |
2326 | ||
66f0296e SM |
2327 | static re_char ** regstart, ** regend; |
2328 | static re_char **best_regstart, **best_regend; | |
fa9a63c5 RM |
2329 | |
2330 | /* Make the register vectors big enough for NUM_REGS registers, | |
4bb91c68 | 2331 | but don't make them smaller. */ |
fa9a63c5 RM |
2332 | |
2333 | static | |
2334 | regex_grow_registers (num_regs) | |
2335 | int num_regs; | |
2336 | { | |
2337 | if (num_regs > regs_allocated_size) | |
2338 | { | |
66f0296e SM |
2339 | RETALLOC_IF (regstart, num_regs, re_char *); |
2340 | RETALLOC_IF (regend, num_regs, re_char *); | |
2341 | RETALLOC_IF (best_regstart, num_regs, re_char *); | |
2342 | RETALLOC_IF (best_regend, num_regs, re_char *); | |
fa9a63c5 RM |
2343 | |
2344 | regs_allocated_size = num_regs; | |
2345 | } | |
2346 | } | |
2347 | ||
2348 | #endif /* not MATCH_MAY_ALLOCATE */ | |
2349 | \f | |
99633e97 SM |
2350 | static boolean group_in_compile_stack _RE_ARGS ((compile_stack_type |
2351 | compile_stack, | |
2352 | regnum_t regnum)); | |
2353 | ||
fa9a63c5 RM |
2354 | /* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX. |
2355 | Returns one of error codes defined in `regex.h', or zero for success. | |
2356 | ||
2357 | Assumes the `allocated' (and perhaps `buffer') and `translate' | |
2358 | fields are set in BUFP on entry. | |
2359 | ||
2360 | If it succeeds, results are put in BUFP (if it returns an error, the | |
2361 | contents of BUFP are undefined): | |
2362 | `buffer' is the compiled pattern; | |
2363 | `syntax' is set to SYNTAX; | |
2364 | `used' is set to the length of the compiled pattern; | |
2365 | `fastmap_accurate' is zero; | |
2366 | `re_nsub' is the number of subexpressions in PATTERN; | |
2367 | `not_bol' and `not_eol' are zero; | |
5e69f11e | 2368 | |
c0f9ea08 | 2369 | The `fastmap' field is neither examined nor set. */ |
fa9a63c5 | 2370 | |
505bde11 SM |
2371 | /* Insert the `jump' from the end of last alternative to "here". |
2372 | The space for the jump has already been allocated. */ | |
2373 | #define FIXUP_ALT_JUMP() \ | |
2374 | do { \ | |
2375 | if (fixup_alt_jump) \ | |
2376 | STORE_JUMP (jump, fixup_alt_jump, b); \ | |
2377 | } while (0) | |
2378 | ||
2379 | ||
fa9a63c5 RM |
2380 | /* Return, freeing storage we allocated. */ |
2381 | #define FREE_STACK_RETURN(value) \ | |
b18215fc RS |
2382 | do { \ |
2383 | FREE_RANGE_TABLE_WORK_AREA (range_table_work); \ | |
2384 | free (compile_stack.stack); \ | |
2385 | return value; \ | |
2386 | } while (0) | |
fa9a63c5 RM |
2387 | |
2388 | static reg_errcode_t | |
2389 | regex_compile (pattern, size, syntax, bufp) | |
66f0296e | 2390 | re_char *pattern; |
4bb91c68 | 2391 | size_t size; |
fa9a63c5 RM |
2392 | reg_syntax_t syntax; |
2393 | struct re_pattern_buffer *bufp; | |
2394 | { | |
01618498 SM |
2395 | /* We fetch characters from PATTERN here. */ |
2396 | register re_wchar_t c, c1; | |
5e69f11e | 2397 | |
fa9a63c5 | 2398 | /* A random temporary spot in PATTERN. */ |
66f0296e | 2399 | re_char *p1; |
fa9a63c5 RM |
2400 | |
2401 | /* Points to the end of the buffer, where we should append. */ | |
2402 | register unsigned char *b; | |
5e69f11e | 2403 | |
fa9a63c5 RM |
2404 | /* Keeps track of unclosed groups. */ |
2405 | compile_stack_type compile_stack; | |
2406 | ||
2407 | /* Points to the current (ending) position in the pattern. */ | |
22336245 RS |
2408 | #ifdef AIX |
2409 | /* `const' makes AIX compiler fail. */ | |
66f0296e | 2410 | unsigned char *p = pattern; |
22336245 | 2411 | #else |
66f0296e | 2412 | re_char *p = pattern; |
22336245 | 2413 | #endif |
66f0296e | 2414 | re_char *pend = pattern + size; |
5e69f11e | 2415 | |
fa9a63c5 | 2416 | /* How to translate the characters in the pattern. */ |
6676cb1c | 2417 | RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 RM |
2418 | |
2419 | /* Address of the count-byte of the most recently inserted `exactn' | |
2420 | command. This makes it possible to tell if a new exact-match | |
2421 | character can be added to that command or if the character requires | |
2422 | a new `exactn' command. */ | |
2423 | unsigned char *pending_exact = 0; | |
2424 | ||
2425 | /* Address of start of the most recently finished expression. | |
2426 | This tells, e.g., postfix * where to find the start of its | |
2427 | operand. Reset at the beginning of groups and alternatives. */ | |
2428 | unsigned char *laststart = 0; | |
2429 | ||
2430 | /* Address of beginning of regexp, or inside of last group. */ | |
2431 | unsigned char *begalt; | |
2432 | ||
2433 | /* Place in the uncompiled pattern (i.e., the {) to | |
2434 | which to go back if the interval is invalid. */ | |
66f0296e | 2435 | re_char *beg_interval; |
5e69f11e | 2436 | |
fa9a63c5 | 2437 | /* Address of the place where a forward jump should go to the end of |
25fe55af | 2438 | the containing expression. Each alternative of an `or' -- except the |
fa9a63c5 RM |
2439 | last -- ends with a forward jump of this sort. */ |
2440 | unsigned char *fixup_alt_jump = 0; | |
2441 | ||
2442 | /* Counts open-groups as they are encountered. Remembered for the | |
2443 | matching close-group on the compile stack, so the same register | |
2444 | number is put in the stop_memory as the start_memory. */ | |
2445 | regnum_t regnum = 0; | |
2446 | ||
b18215fc RS |
2447 | /* Work area for range table of charset. */ |
2448 | struct range_table_work_area range_table_work; | |
2449 | ||
2d1675e4 SM |
2450 | /* If the object matched can contain multibyte characters. */ |
2451 | const boolean multibyte = RE_MULTIBYTE_P (bufp); | |
2452 | ||
fa9a63c5 | 2453 | #ifdef DEBUG |
99633e97 | 2454 | debug++; |
fa9a63c5 | 2455 | DEBUG_PRINT1 ("\nCompiling pattern: "); |
99633e97 | 2456 | if (debug > 0) |
fa9a63c5 RM |
2457 | { |
2458 | unsigned debug_count; | |
5e69f11e | 2459 | |
fa9a63c5 | 2460 | for (debug_count = 0; debug_count < size; debug_count++) |
25fe55af | 2461 | putchar (pattern[debug_count]); |
fa9a63c5 RM |
2462 | putchar ('\n'); |
2463 | } | |
2464 | #endif /* DEBUG */ | |
2465 | ||
2466 | /* Initialize the compile stack. */ | |
2467 | compile_stack.stack = TALLOC (INIT_COMPILE_STACK_SIZE, compile_stack_elt_t); | |
2468 | if (compile_stack.stack == NULL) | |
2469 | return REG_ESPACE; | |
2470 | ||
2471 | compile_stack.size = INIT_COMPILE_STACK_SIZE; | |
2472 | compile_stack.avail = 0; | |
2473 | ||
b18215fc RS |
2474 | range_table_work.table = 0; |
2475 | range_table_work.allocated = 0; | |
2476 | ||
fa9a63c5 RM |
2477 | /* Initialize the pattern buffer. */ |
2478 | bufp->syntax = syntax; | |
2479 | bufp->fastmap_accurate = 0; | |
2480 | bufp->not_bol = bufp->not_eol = 0; | |
2481 | ||
2482 | /* Set `used' to zero, so that if we return an error, the pattern | |
2483 | printer (for debugging) will think there's no pattern. We reset it | |
2484 | at the end. */ | |
2485 | bufp->used = 0; | |
5e69f11e | 2486 | |
fa9a63c5 | 2487 | /* Always count groups, whether or not bufp->no_sub is set. */ |
5e69f11e | 2488 | bufp->re_nsub = 0; |
fa9a63c5 | 2489 | |
0b32bf0e | 2490 | #if !defined emacs && !defined SYNTAX_TABLE |
fa9a63c5 RM |
2491 | /* Initialize the syntax table. */ |
2492 | init_syntax_once (); | |
2493 | #endif | |
2494 | ||
2495 | if (bufp->allocated == 0) | |
2496 | { | |
2497 | if (bufp->buffer) | |
2498 | { /* If zero allocated, but buffer is non-null, try to realloc | |
25fe55af RS |
2499 | enough space. This loses if buffer's address is bogus, but |
2500 | that is the user's responsibility. */ | |
2501 | RETALLOC (bufp->buffer, INIT_BUF_SIZE, unsigned char); | |
2502 | } | |
fa9a63c5 | 2503 | else |
25fe55af RS |
2504 | { /* Caller did not allocate a buffer. Do it for them. */ |
2505 | bufp->buffer = TALLOC (INIT_BUF_SIZE, unsigned char); | |
2506 | } | |
fa9a63c5 RM |
2507 | if (!bufp->buffer) FREE_STACK_RETURN (REG_ESPACE); |
2508 | ||
2509 | bufp->allocated = INIT_BUF_SIZE; | |
2510 | } | |
2511 | ||
2512 | begalt = b = bufp->buffer; | |
2513 | ||
2514 | /* Loop through the uncompiled pattern until we're at the end. */ | |
2515 | while (p != pend) | |
2516 | { | |
2517 | PATFETCH (c); | |
2518 | ||
2519 | switch (c) | |
25fe55af RS |
2520 | { |
2521 | case '^': | |
2522 | { | |
2523 | if ( /* If at start of pattern, it's an operator. */ | |
2524 | p == pattern + 1 | |
2525 | /* If context independent, it's an operator. */ | |
2526 | || syntax & RE_CONTEXT_INDEP_ANCHORS | |
2527 | /* Otherwise, depends on what's come before. */ | |
2528 | || at_begline_loc_p (pattern, p, syntax)) | |
c0f9ea08 | 2529 | BUF_PUSH ((syntax & RE_NO_NEWLINE_ANCHOR) ? begbuf : begline); |
25fe55af RS |
2530 | else |
2531 | goto normal_char; | |
2532 | } | |
2533 | break; | |
2534 | ||
2535 | ||
2536 | case '$': | |
2537 | { | |
2538 | if ( /* If at end of pattern, it's an operator. */ | |
2539 | p == pend | |
2540 | /* If context independent, it's an operator. */ | |
2541 | || syntax & RE_CONTEXT_INDEP_ANCHORS | |
2542 | /* Otherwise, depends on what's next. */ | |
2543 | || at_endline_loc_p (p, pend, syntax)) | |
c0f9ea08 | 2544 | BUF_PUSH ((syntax & RE_NO_NEWLINE_ANCHOR) ? endbuf : endline); |
25fe55af RS |
2545 | else |
2546 | goto normal_char; | |
2547 | } | |
2548 | break; | |
fa9a63c5 RM |
2549 | |
2550 | ||
2551 | case '+': | |
25fe55af RS |
2552 | case '?': |
2553 | if ((syntax & RE_BK_PLUS_QM) | |
2554 | || (syntax & RE_LIMITED_OPS)) | |
2555 | goto normal_char; | |
2556 | handle_plus: | |
2557 | case '*': | |
2558 | /* If there is no previous pattern... */ | |
2559 | if (!laststart) | |
2560 | { | |
2561 | if (syntax & RE_CONTEXT_INVALID_OPS) | |
2562 | FREE_STACK_RETURN (REG_BADRPT); | |
2563 | else if (!(syntax & RE_CONTEXT_INDEP_OPS)) | |
2564 | goto normal_char; | |
2565 | } | |
2566 | ||
2567 | { | |
25fe55af | 2568 | /* 1 means zero (many) matches is allowed. */ |
66f0296e SM |
2569 | boolean zero_times_ok = 0, many_times_ok = 0; |
2570 | boolean greedy = 1; | |
25fe55af RS |
2571 | |
2572 | /* If there is a sequence of repetition chars, collapse it | |
2573 | down to just one (the right one). We can't combine | |
2574 | interval operators with these because of, e.g., `a{2}*', | |
2575 | which should only match an even number of `a's. */ | |
2576 | ||
2577 | for (;;) | |
2578 | { | |
0b32bf0e | 2579 | if ((syntax & RE_FRUGAL) |
1c8c6d39 DL |
2580 | && c == '?' && (zero_times_ok || many_times_ok)) |
2581 | greedy = 0; | |
2582 | else | |
2583 | { | |
2584 | zero_times_ok |= c != '+'; | |
2585 | many_times_ok |= c != '?'; | |
2586 | } | |
25fe55af RS |
2587 | |
2588 | if (p == pend) | |
2589 | break; | |
ed0767d8 SM |
2590 | else if (*p == '*' |
2591 | || (!(syntax & RE_BK_PLUS_QM) | |
2592 | && (*p == '+' || *p == '?'))) | |
25fe55af | 2593 | ; |
ed0767d8 | 2594 | else if (syntax & RE_BK_PLUS_QM && *p == '\\') |
25fe55af | 2595 | { |
ed0767d8 SM |
2596 | if (p+1 == pend) |
2597 | FREE_STACK_RETURN (REG_EESCAPE); | |
2598 | if (p[1] == '+' || p[1] == '?') | |
2599 | PATFETCH (c); /* Gobble up the backslash. */ | |
2600 | else | |
2601 | break; | |
25fe55af RS |
2602 | } |
2603 | else | |
ed0767d8 | 2604 | break; |
25fe55af | 2605 | /* If we get here, we found another repeat character. */ |
ed0767d8 SM |
2606 | PATFETCH (c); |
2607 | } | |
25fe55af RS |
2608 | |
2609 | /* Star, etc. applied to an empty pattern is equivalent | |
2610 | to an empty pattern. */ | |
4e8a9132 | 2611 | if (!laststart || laststart == b) |
25fe55af RS |
2612 | break; |
2613 | ||
2614 | /* Now we know whether or not zero matches is allowed | |
2615 | and also whether or not two or more matches is allowed. */ | |
1c8c6d39 DL |
2616 | if (greedy) |
2617 | { | |
99633e97 | 2618 | if (many_times_ok) |
4e8a9132 SM |
2619 | { |
2620 | boolean simple = skip_one_char (laststart) == b; | |
2621 | unsigned int startoffset = 0; | |
f6a3f532 | 2622 | re_opcode_t ofj = |
01618498 | 2623 | /* Check if the loop can match the empty string. */ |
6df42991 SM |
2624 | (simple || !analyse_first (laststart, b, NULL, 0)) |
2625 | ? on_failure_jump : on_failure_jump_loop; | |
4e8a9132 | 2626 | assert (skip_one_char (laststart) <= b); |
177c0ea7 | 2627 | |
4e8a9132 SM |
2628 | if (!zero_times_ok && simple) |
2629 | { /* Since simple * loops can be made faster by using | |
2630 | on_failure_keep_string_jump, we turn simple P+ | |
2631 | into PP* if P is simple. */ | |
2632 | unsigned char *p1, *p2; | |
2633 | startoffset = b - laststart; | |
2634 | GET_BUFFER_SPACE (startoffset); | |
2635 | p1 = b; p2 = laststart; | |
2636 | while (p2 < p1) | |
2637 | *b++ = *p2++; | |
2638 | zero_times_ok = 1; | |
99633e97 | 2639 | } |
4e8a9132 SM |
2640 | |
2641 | GET_BUFFER_SPACE (6); | |
2642 | if (!zero_times_ok) | |
2643 | /* A + loop. */ | |
f6a3f532 | 2644 | STORE_JUMP (ofj, b, b + 6); |
99633e97 | 2645 | else |
4e8a9132 SM |
2646 | /* Simple * loops can use on_failure_keep_string_jump |
2647 | depending on what follows. But since we don't know | |
2648 | that yet, we leave the decision up to | |
2649 | on_failure_jump_smart. */ | |
f6a3f532 | 2650 | INSERT_JUMP (simple ? on_failure_jump_smart : ofj, |
4e8a9132 | 2651 | laststart + startoffset, b + 6); |
99633e97 | 2652 | b += 3; |
4e8a9132 | 2653 | STORE_JUMP (jump, b, laststart + startoffset); |
99633e97 SM |
2654 | b += 3; |
2655 | } | |
2656 | else | |
2657 | { | |
4e8a9132 SM |
2658 | /* A simple ? pattern. */ |
2659 | assert (zero_times_ok); | |
2660 | GET_BUFFER_SPACE (3); | |
2661 | INSERT_JUMP (on_failure_jump, laststart, b + 3); | |
99633e97 SM |
2662 | b += 3; |
2663 | } | |
1c8c6d39 DL |
2664 | } |
2665 | else /* not greedy */ | |
2666 | { /* I wish the greedy and non-greedy cases could be merged. */ | |
2667 | ||
0683b6fa | 2668 | GET_BUFFER_SPACE (7); /* We might use less. */ |
1c8c6d39 DL |
2669 | if (many_times_ok) |
2670 | { | |
f6a3f532 SM |
2671 | boolean emptyp = analyse_first (laststart, b, NULL, 0); |
2672 | ||
6df42991 SM |
2673 | /* The non-greedy multiple match looks like |
2674 | a repeat..until: we only need a conditional jump | |
2675 | at the end of the loop. */ | |
f6a3f532 SM |
2676 | if (emptyp) BUF_PUSH (no_op); |
2677 | STORE_JUMP (emptyp ? on_failure_jump_nastyloop | |
2678 | : on_failure_jump, b, laststart); | |
1c8c6d39 DL |
2679 | b += 3; |
2680 | if (zero_times_ok) | |
2681 | { | |
2682 | /* The repeat...until naturally matches one or more. | |
2683 | To also match zero times, we need to first jump to | |
6df42991 | 2684 | the end of the loop (its conditional jump). */ |
1c8c6d39 DL |
2685 | INSERT_JUMP (jump, laststart, b); |
2686 | b += 3; | |
2687 | } | |
2688 | } | |
2689 | else | |
2690 | { | |
2691 | /* non-greedy a?? */ | |
1c8c6d39 DL |
2692 | INSERT_JUMP (jump, laststart, b + 3); |
2693 | b += 3; | |
2694 | INSERT_JUMP (on_failure_jump, laststart, laststart + 6); | |
2695 | b += 3; | |
2696 | } | |
2697 | } | |
2698 | } | |
4e8a9132 | 2699 | pending_exact = 0; |
fa9a63c5 RM |
2700 | break; |
2701 | ||
2702 | ||
2703 | case '.': | |
25fe55af RS |
2704 | laststart = b; |
2705 | BUF_PUSH (anychar); | |
2706 | break; | |
fa9a63c5 RM |
2707 | |
2708 | ||
25fe55af RS |
2709 | case '[': |
2710 | { | |
b18215fc | 2711 | CLEAR_RANGE_TABLE_WORK_USED (range_table_work); |
fa9a63c5 | 2712 | |
25fe55af | 2713 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
fa9a63c5 | 2714 | |
25fe55af RS |
2715 | /* Ensure that we have enough space to push a charset: the |
2716 | opcode, the length count, and the bitset; 34 bytes in all. */ | |
fa9a63c5 RM |
2717 | GET_BUFFER_SPACE (34); |
2718 | ||
25fe55af | 2719 | laststart = b; |
e318085a | 2720 | |
25fe55af RS |
2721 | /* We test `*p == '^' twice, instead of using an if |
2722 | statement, so we only need one BUF_PUSH. */ | |
2723 | BUF_PUSH (*p == '^' ? charset_not : charset); | |
2724 | if (*p == '^') | |
2725 | p++; | |
e318085a | 2726 | |
25fe55af RS |
2727 | /* Remember the first position in the bracket expression. */ |
2728 | p1 = p; | |
e318085a | 2729 | |
25fe55af RS |
2730 | /* Push the number of bytes in the bitmap. */ |
2731 | BUF_PUSH ((1 << BYTEWIDTH) / BYTEWIDTH); | |
e318085a | 2732 | |
25fe55af RS |
2733 | /* Clear the whole map. */ |
2734 | bzero (b, (1 << BYTEWIDTH) / BYTEWIDTH); | |
e318085a | 2735 | |
25fe55af RS |
2736 | /* charset_not matches newline according to a syntax bit. */ |
2737 | if ((re_opcode_t) b[-2] == charset_not | |
2738 | && (syntax & RE_HAT_LISTS_NOT_NEWLINE)) | |
2739 | SET_LIST_BIT ('\n'); | |
fa9a63c5 | 2740 | |
25fe55af RS |
2741 | /* Read in characters and ranges, setting map bits. */ |
2742 | for (;;) | |
2743 | { | |
b18215fc | 2744 | boolean escaped_char = false; |
2d1675e4 | 2745 | const unsigned char *p2 = p; |
e318085a | 2746 | |
25fe55af | 2747 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
e318085a | 2748 | |
36595814 SM |
2749 | /* Don't translate yet. The range TRANSLATE(X..Y) cannot |
2750 | always be determined from TRANSLATE(X) and TRANSLATE(Y) | |
2751 | So the translation is done later in a loop. Example: | |
2752 | (let ((case-fold-search t)) (string-match "[A-_]" "A")) */ | |
25fe55af | 2753 | PATFETCH (c); |
e318085a | 2754 | |
25fe55af RS |
2755 | /* \ might escape characters inside [...] and [^...]. */ |
2756 | if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\') | |
2757 | { | |
2758 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
e318085a RS |
2759 | |
2760 | PATFETCH (c); | |
b18215fc | 2761 | escaped_char = true; |
25fe55af | 2762 | } |
b18215fc RS |
2763 | else |
2764 | { | |
657fcfbd RS |
2765 | /* Could be the end of the bracket expression. If it's |
2766 | not (i.e., when the bracket expression is `[]' so | |
2767 | far), the ']' character bit gets set way below. */ | |
2d1675e4 | 2768 | if (c == ']' && p2 != p1) |
657fcfbd | 2769 | break; |
25fe55af | 2770 | } |
b18215fc | 2771 | |
b18215fc RS |
2772 | /* What should we do for the character which is |
2773 | greater than 0x7F, but not BASE_LEADING_CODE_P? | |
2774 | XXX */ | |
2775 | ||
25fe55af RS |
2776 | /* See if we're at the beginning of a possible character |
2777 | class. */ | |
b18215fc | 2778 | |
2d1675e4 SM |
2779 | if (!escaped_char && |
2780 | syntax & RE_CHAR_CLASSES && c == '[' && *p == ':') | |
657fcfbd RS |
2781 | { |
2782 | /* Leave room for the null. */ | |
14473664 | 2783 | unsigned char str[CHAR_CLASS_MAX_LENGTH + 1]; |
ed0767d8 | 2784 | const unsigned char *class_beg; |
b18215fc | 2785 | |
25fe55af RS |
2786 | PATFETCH (c); |
2787 | c1 = 0; | |
ed0767d8 | 2788 | class_beg = p; |
b18215fc | 2789 | |
25fe55af RS |
2790 | /* If pattern is `[[:'. */ |
2791 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); | |
b18215fc | 2792 | |
25fe55af RS |
2793 | for (;;) |
2794 | { | |
14473664 SM |
2795 | PATFETCH (c); |
2796 | if ((c == ':' && *p == ']') || p == pend) | |
2797 | break; | |
2798 | if (c1 < CHAR_CLASS_MAX_LENGTH) | |
2799 | str[c1++] = c; | |
2800 | else | |
2801 | /* This is in any case an invalid class name. */ | |
2802 | str[0] = '\0'; | |
25fe55af RS |
2803 | } |
2804 | str[c1] = '\0'; | |
b18215fc RS |
2805 | |
2806 | /* If isn't a word bracketed by `[:' and `:]': | |
2807 | undo the ending character, the letters, and | |
2808 | leave the leading `:' and `[' (but set bits for | |
2809 | them). */ | |
25fe55af RS |
2810 | if (c == ':' && *p == ']') |
2811 | { | |
36595814 | 2812 | re_wchar_t ch; |
14473664 SM |
2813 | re_wctype_t cc; |
2814 | ||
2815 | cc = re_wctype (str); | |
2816 | ||
2817 | if (cc == 0) | |
fa9a63c5 RM |
2818 | FREE_STACK_RETURN (REG_ECTYPE); |
2819 | ||
14473664 SM |
2820 | /* Throw away the ] at the end of the character |
2821 | class. */ | |
2822 | PATFETCH (c); | |
fa9a63c5 | 2823 | |
14473664 | 2824 | if (p == pend) FREE_STACK_RETURN (REG_EBRACK); |
fa9a63c5 | 2825 | |
96cc36cc RS |
2826 | /* Most character classes in a multibyte match |
2827 | just set a flag. Exceptions are is_blank, | |
2828 | is_digit, is_cntrl, and is_xdigit, since | |
2829 | they can only match ASCII characters. We | |
14473664 SM |
2830 | don't need to handle them for multibyte. |
2831 | They are distinguished by a negative wctype. */ | |
96cc36cc | 2832 | |
2d1675e4 | 2833 | if (multibyte) |
14473664 SM |
2834 | SET_RANGE_TABLE_WORK_AREA_BIT (range_table_work, |
2835 | re_wctype_to_bit (cc)); | |
96cc36cc | 2836 | |
14473664 | 2837 | for (ch = 0; ch < 1 << BYTEWIDTH; ++ch) |
25fe55af | 2838 | { |
7ae68633 | 2839 | int translated = TRANSLATE (ch); |
14473664 | 2840 | if (re_iswctype (btowc (ch), cc)) |
96cc36cc | 2841 | SET_LIST_BIT (translated); |
25fe55af | 2842 | } |
b18215fc RS |
2843 | |
2844 | /* Repeat the loop. */ | |
2845 | continue; | |
25fe55af RS |
2846 | } |
2847 | else | |
2848 | { | |
ed0767d8 SM |
2849 | /* Go back to right after the "[:". */ |
2850 | p = class_beg; | |
25fe55af | 2851 | SET_LIST_BIT ('['); |
b18215fc RS |
2852 | |
2853 | /* Because the `:' may starts the range, we | |
2854 | can't simply set bit and repeat the loop. | |
25fe55af | 2855 | Instead, just set it to C and handle below. */ |
b18215fc | 2856 | c = ':'; |
25fe55af RS |
2857 | } |
2858 | } | |
b18215fc RS |
2859 | |
2860 | if (p < pend && p[0] == '-' && p[1] != ']') | |
2861 | { | |
2862 | ||
2863 | /* Discard the `-'. */ | |
2864 | PATFETCH (c1); | |
2865 | ||
2866 | /* Fetch the character which ends the range. */ | |
2867 | PATFETCH (c1); | |
b18215fc | 2868 | |
b54f61ed | 2869 | if (SINGLE_BYTE_CHAR_P (c)) |
e934739e | 2870 | { |
b54f61ed KH |
2871 | if (! SINGLE_BYTE_CHAR_P (c1)) |
2872 | { | |
3ff2446d KH |
2873 | /* Handle a range starting with a |
2874 | character of less than 256, and ending | |
2875 | with a character of not less than 256. | |
2876 | Split that into two ranges, the low one | |
2877 | ending at 0377, and the high one | |
2878 | starting at the smallest character in | |
2879 | the charset of C1 and ending at C1. */ | |
b54f61ed | 2880 | int charset = CHAR_CHARSET (c1); |
36595814 SM |
2881 | re_wchar_t c2 = MAKE_CHAR (charset, 0, 0); |
2882 | ||
b54f61ed KH |
2883 | SET_RANGE_TABLE_WORK_AREA (range_table_work, |
2884 | c2, c1); | |
333526e0 | 2885 | c1 = 0377; |
b54f61ed | 2886 | } |
e934739e RS |
2887 | } |
2888 | else if (!SAME_CHARSET_P (c, c1)) | |
b18215fc | 2889 | FREE_STACK_RETURN (REG_ERANGE); |
e318085a | 2890 | } |
25fe55af | 2891 | else |
b18215fc RS |
2892 | /* Range from C to C. */ |
2893 | c1 = c; | |
2894 | ||
2895 | /* Set the range ... */ | |
2896 | if (SINGLE_BYTE_CHAR_P (c)) | |
2897 | /* ... into bitmap. */ | |
25fe55af | 2898 | { |
01618498 | 2899 | re_wchar_t this_char; |
36595814 | 2900 | re_wchar_t range_start = c, range_end = c1; |
b18215fc RS |
2901 | |
2902 | /* If the start is after the end, the range is empty. */ | |
2903 | if (range_start > range_end) | |
2904 | { | |
2905 | if (syntax & RE_NO_EMPTY_RANGES) | |
2906 | FREE_STACK_RETURN (REG_ERANGE); | |
2907 | /* Else, repeat the loop. */ | |
2908 | } | |
2909 | else | |
2910 | { | |
2911 | for (this_char = range_start; this_char <= range_end; | |
2912 | this_char++) | |
2913 | SET_LIST_BIT (TRANSLATE (this_char)); | |
e934739e | 2914 | } |
25fe55af | 2915 | } |
e318085a | 2916 | else |
b18215fc RS |
2917 | /* ... into range table. */ |
2918 | SET_RANGE_TABLE_WORK_AREA (range_table_work, c, c1); | |
e318085a RS |
2919 | } |
2920 | ||
25fe55af RS |
2921 | /* Discard any (non)matching list bytes that are all 0 at the |
2922 | end of the map. Decrease the map-length byte too. */ | |
2923 | while ((int) b[-1] > 0 && b[b[-1] - 1] == 0) | |
2924 | b[-1]--; | |
2925 | b += b[-1]; | |
fa9a63c5 | 2926 | |
96cc36cc RS |
2927 | /* Build real range table from work area. */ |
2928 | if (RANGE_TABLE_WORK_USED (range_table_work) | |
2929 | || RANGE_TABLE_WORK_BITS (range_table_work)) | |
b18215fc RS |
2930 | { |
2931 | int i; | |
2932 | int used = RANGE_TABLE_WORK_USED (range_table_work); | |
fa9a63c5 | 2933 | |
b18215fc | 2934 | /* Allocate space for COUNT + RANGE_TABLE. Needs two |
96cc36cc RS |
2935 | bytes for flags, two for COUNT, and three bytes for |
2936 | each character. */ | |
2937 | GET_BUFFER_SPACE (4 + used * 3); | |
fa9a63c5 | 2938 | |
b18215fc RS |
2939 | /* Indicate the existence of range table. */ |
2940 | laststart[1] |= 0x80; | |
fa9a63c5 | 2941 | |
96cc36cc RS |
2942 | /* Store the character class flag bits into the range table. |
2943 | If not in emacs, these flag bits are always 0. */ | |
2944 | *b++ = RANGE_TABLE_WORK_BITS (range_table_work) & 0xff; | |
2945 | *b++ = RANGE_TABLE_WORK_BITS (range_table_work) >> 8; | |
2946 | ||
b18215fc RS |
2947 | STORE_NUMBER_AND_INCR (b, used / 2); |
2948 | for (i = 0; i < used; i++) | |
2949 | STORE_CHARACTER_AND_INCR | |
2950 | (b, RANGE_TABLE_WORK_ELT (range_table_work, i)); | |
2951 | } | |
25fe55af RS |
2952 | } |
2953 | break; | |
fa9a63c5 RM |
2954 | |
2955 | ||
b18215fc | 2956 | case '(': |
25fe55af RS |
2957 | if (syntax & RE_NO_BK_PARENS) |
2958 | goto handle_open; | |
2959 | else | |
2960 | goto normal_char; | |
fa9a63c5 RM |
2961 | |
2962 | ||
25fe55af RS |
2963 | case ')': |
2964 | if (syntax & RE_NO_BK_PARENS) | |
2965 | goto handle_close; | |
2966 | else | |
2967 | goto normal_char; | |
e318085a RS |
2968 | |
2969 | ||
25fe55af RS |
2970 | case '\n': |
2971 | if (syntax & RE_NEWLINE_ALT) | |
2972 | goto handle_alt; | |
2973 | else | |
2974 | goto normal_char; | |
e318085a RS |
2975 | |
2976 | ||
b18215fc | 2977 | case '|': |
25fe55af RS |
2978 | if (syntax & RE_NO_BK_VBAR) |
2979 | goto handle_alt; | |
2980 | else | |
2981 | goto normal_char; | |
2982 | ||
2983 | ||
2984 | case '{': | |
2985 | if (syntax & RE_INTERVALS && syntax & RE_NO_BK_BRACES) | |
2986 | goto handle_interval; | |
2987 | else | |
2988 | goto normal_char; | |
2989 | ||
2990 | ||
2991 | case '\\': | |
2992 | if (p == pend) FREE_STACK_RETURN (REG_EESCAPE); | |
2993 | ||
2994 | /* Do not translate the character after the \, so that we can | |
2995 | distinguish, e.g., \B from \b, even if we normally would | |
2996 | translate, e.g., B to b. */ | |
36595814 | 2997 | PATFETCH (c); |
25fe55af RS |
2998 | |
2999 | switch (c) | |
3000 | { | |
3001 | case '(': | |
3002 | if (syntax & RE_NO_BK_PARENS) | |
3003 | goto normal_backslash; | |
3004 | ||
3005 | handle_open: | |
505bde11 SM |
3006 | { |
3007 | int shy = 0; | |
3008 | if (p+1 < pend) | |
3009 | { | |
3010 | /* Look for a special (?...) construct */ | |
ed0767d8 | 3011 | if ((syntax & RE_SHY_GROUPS) && *p == '?') |
505bde11 | 3012 | { |
ed0767d8 | 3013 | PATFETCH (c); /* Gobble up the '?'. */ |
505bde11 SM |
3014 | PATFETCH (c); |
3015 | switch (c) | |
3016 | { | |
3017 | case ':': shy = 1; break; | |
3018 | default: | |
3019 | /* Only (?:...) is supported right now. */ | |
3020 | FREE_STACK_RETURN (REG_BADPAT); | |
3021 | } | |
3022 | } | |
505bde11 SM |
3023 | } |
3024 | ||
3025 | if (!shy) | |
3026 | { | |
3027 | bufp->re_nsub++; | |
3028 | regnum++; | |
3029 | } | |
25fe55af | 3030 | |
99633e97 SM |
3031 | if (COMPILE_STACK_FULL) |
3032 | { | |
3033 | RETALLOC (compile_stack.stack, compile_stack.size << 1, | |
3034 | compile_stack_elt_t); | |
3035 | if (compile_stack.stack == NULL) return REG_ESPACE; | |
25fe55af | 3036 | |
99633e97 SM |
3037 | compile_stack.size <<= 1; |
3038 | } | |
25fe55af | 3039 | |
99633e97 SM |
3040 | /* These are the values to restore when we hit end of this |
3041 | group. They are all relative offsets, so that if the | |
3042 | whole pattern moves because of realloc, they will still | |
3043 | be valid. */ | |
3044 | COMPILE_STACK_TOP.begalt_offset = begalt - bufp->buffer; | |
3045 | COMPILE_STACK_TOP.fixup_alt_jump | |
3046 | = fixup_alt_jump ? fixup_alt_jump - bufp->buffer + 1 : 0; | |
3047 | COMPILE_STACK_TOP.laststart_offset = b - bufp->buffer; | |
3048 | COMPILE_STACK_TOP.regnum = shy ? -regnum : regnum; | |
3049 | ||
3050 | /* Do not push a | |
3051 | start_memory for groups beyond the last one we can | |
3052 | represent in the compiled pattern. */ | |
3053 | if (regnum <= MAX_REGNUM && !shy) | |
3054 | BUF_PUSH_2 (start_memory, regnum); | |
3055 | ||
3056 | compile_stack.avail++; | |
3057 | ||
3058 | fixup_alt_jump = 0; | |
3059 | laststart = 0; | |
3060 | begalt = b; | |
3061 | /* If we've reached MAX_REGNUM groups, then this open | |
3062 | won't actually generate any code, so we'll have to | |
3063 | clear pending_exact explicitly. */ | |
3064 | pending_exact = 0; | |
3065 | break; | |
505bde11 | 3066 | } |
25fe55af RS |
3067 | |
3068 | case ')': | |
3069 | if (syntax & RE_NO_BK_PARENS) goto normal_backslash; | |
3070 | ||
3071 | if (COMPILE_STACK_EMPTY) | |
505bde11 SM |
3072 | { |
3073 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) | |
3074 | goto normal_backslash; | |
3075 | else | |
3076 | FREE_STACK_RETURN (REG_ERPAREN); | |
3077 | } | |
25fe55af RS |
3078 | |
3079 | handle_close: | |
505bde11 | 3080 | FIXUP_ALT_JUMP (); |
25fe55af RS |
3081 | |
3082 | /* See similar code for backslashed left paren above. */ | |
3083 | if (COMPILE_STACK_EMPTY) | |
505bde11 SM |
3084 | { |
3085 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) | |
3086 | goto normal_char; | |
3087 | else | |
3088 | FREE_STACK_RETURN (REG_ERPAREN); | |
3089 | } | |
25fe55af RS |
3090 | |
3091 | /* Since we just checked for an empty stack above, this | |
3092 | ``can't happen''. */ | |
3093 | assert (compile_stack.avail != 0); | |
3094 | { | |
3095 | /* We don't just want to restore into `regnum', because | |
3096 | later groups should continue to be numbered higher, | |
3097 | as in `(ab)c(de)' -- the second group is #2. */ | |
3098 | regnum_t this_group_regnum; | |
3099 | ||
3100 | compile_stack.avail--; | |
3101 | begalt = bufp->buffer + COMPILE_STACK_TOP.begalt_offset; | |
3102 | fixup_alt_jump | |
3103 | = COMPILE_STACK_TOP.fixup_alt_jump | |
3104 | ? bufp->buffer + COMPILE_STACK_TOP.fixup_alt_jump - 1 | |
3105 | : 0; | |
3106 | laststart = bufp->buffer + COMPILE_STACK_TOP.laststart_offset; | |
3107 | this_group_regnum = COMPILE_STACK_TOP.regnum; | |
b18215fc RS |
3108 | /* If we've reached MAX_REGNUM groups, then this open |
3109 | won't actually generate any code, so we'll have to | |
3110 | clear pending_exact explicitly. */ | |
3111 | pending_exact = 0; | |
e318085a | 3112 | |
25fe55af RS |
3113 | /* We're at the end of the group, so now we know how many |
3114 | groups were inside this one. */ | |
505bde11 SM |
3115 | if (this_group_regnum <= MAX_REGNUM && this_group_regnum > 0) |
3116 | BUF_PUSH_2 (stop_memory, this_group_regnum); | |
25fe55af RS |
3117 | } |
3118 | break; | |
3119 | ||
3120 | ||
3121 | case '|': /* `\|'. */ | |
3122 | if (syntax & RE_LIMITED_OPS || syntax & RE_NO_BK_VBAR) | |
3123 | goto normal_backslash; | |
3124 | handle_alt: | |
3125 | if (syntax & RE_LIMITED_OPS) | |
3126 | goto normal_char; | |
3127 | ||
3128 | /* Insert before the previous alternative a jump which | |
3129 | jumps to this alternative if the former fails. */ | |
3130 | GET_BUFFER_SPACE (3); | |
3131 | INSERT_JUMP (on_failure_jump, begalt, b + 6); | |
3132 | pending_exact = 0; | |
3133 | b += 3; | |
3134 | ||
3135 | /* The alternative before this one has a jump after it | |
3136 | which gets executed if it gets matched. Adjust that | |
3137 | jump so it will jump to this alternative's analogous | |
3138 | jump (put in below, which in turn will jump to the next | |
3139 | (if any) alternative's such jump, etc.). The last such | |
3140 | jump jumps to the correct final destination. A picture: | |
3141 | _____ _____ | |
3142 | | | | | | |
3143 | | v | v | |
3144 | a | b | c | |
3145 | ||
3146 | If we are at `b', then fixup_alt_jump right now points to a | |
3147 | three-byte space after `a'. We'll put in the jump, set | |
3148 | fixup_alt_jump to right after `b', and leave behind three | |
3149 | bytes which we'll fill in when we get to after `c'. */ | |
3150 | ||
505bde11 | 3151 | FIXUP_ALT_JUMP (); |
25fe55af RS |
3152 | |
3153 | /* Mark and leave space for a jump after this alternative, | |
3154 | to be filled in later either by next alternative or | |
3155 | when know we're at the end of a series of alternatives. */ | |
3156 | fixup_alt_jump = b; | |
3157 | GET_BUFFER_SPACE (3); | |
3158 | b += 3; | |
3159 | ||
3160 | laststart = 0; | |
3161 | begalt = b; | |
3162 | break; | |
3163 | ||
3164 | ||
3165 | case '{': | |
3166 | /* If \{ is a literal. */ | |
3167 | if (!(syntax & RE_INTERVALS) | |
3168 | /* If we're at `\{' and it's not the open-interval | |
3169 | operator. */ | |
4bb91c68 | 3170 | || (syntax & RE_NO_BK_BRACES)) |
25fe55af RS |
3171 | goto normal_backslash; |
3172 | ||
3173 | handle_interval: | |
3174 | { | |
3175 | /* If got here, then the syntax allows intervals. */ | |
3176 | ||
3177 | /* At least (most) this many matches must be made. */ | |
99633e97 | 3178 | int lower_bound = 0, upper_bound = -1; |
25fe55af | 3179 | |
ed0767d8 | 3180 | beg_interval = p; |
25fe55af RS |
3181 | |
3182 | if (p == pend) | |
4bb91c68 | 3183 | FREE_STACK_RETURN (REG_EBRACE); |
25fe55af RS |
3184 | |
3185 | GET_UNSIGNED_NUMBER (lower_bound); | |
3186 | ||
3187 | if (c == ',') | |
ed0767d8 | 3188 | GET_UNSIGNED_NUMBER (upper_bound); |
25fe55af RS |
3189 | else |
3190 | /* Interval such as `{1}' => match exactly once. */ | |
3191 | upper_bound = lower_bound; | |
3192 | ||
3193 | if (lower_bound < 0 || upper_bound > RE_DUP_MAX | |
ed0767d8 | 3194 | || (upper_bound >= 0 && lower_bound > upper_bound)) |
4bb91c68 | 3195 | FREE_STACK_RETURN (REG_BADBR); |
25fe55af RS |
3196 | |
3197 | if (!(syntax & RE_NO_BK_BRACES)) | |
3198 | { | |
4bb91c68 SM |
3199 | if (c != '\\') |
3200 | FREE_STACK_RETURN (REG_BADBR); | |
25fe55af RS |
3201 | |
3202 | PATFETCH (c); | |
3203 | } | |
3204 | ||
3205 | if (c != '}') | |
4bb91c68 | 3206 | FREE_STACK_RETURN (REG_BADBR); |
25fe55af RS |
3207 | |
3208 | /* We just parsed a valid interval. */ | |
3209 | ||
3210 | /* If it's invalid to have no preceding re. */ | |
3211 | if (!laststart) | |
3212 | { | |
3213 | if (syntax & RE_CONTEXT_INVALID_OPS) | |
3214 | FREE_STACK_RETURN (REG_BADRPT); | |
3215 | else if (syntax & RE_CONTEXT_INDEP_OPS) | |
3216 | laststart = b; | |
3217 | else | |
3218 | goto unfetch_interval; | |
3219 | } | |
3220 | ||
6df42991 SM |
3221 | if (upper_bound == 0) |
3222 | /* If the upper bound is zero, just drop the sub pattern | |
3223 | altogether. */ | |
3224 | b = laststart; | |
3225 | else if (lower_bound == 1 && upper_bound == 1) | |
3226 | /* Just match it once: nothing to do here. */ | |
3227 | ; | |
3228 | ||
3229 | /* Otherwise, we have a nontrivial interval. When | |
3230 | we're all done, the pattern will look like: | |
3231 | set_number_at <jump count> <upper bound> | |
3232 | set_number_at <succeed_n count> <lower bound> | |
3233 | succeed_n <after jump addr> <succeed_n count> | |
3234 | <body of loop> | |
3235 | jump_n <succeed_n addr> <jump count> | |
3236 | (The upper bound and `jump_n' are omitted if | |
3237 | `upper_bound' is 1, though.) */ | |
3238 | else | |
3239 | { /* If the upper bound is > 1, we need to insert | |
3240 | more at the end of the loop. */ | |
3241 | unsigned int nbytes = (upper_bound < 0 ? 3 | |
3242 | : upper_bound > 1 ? 5 : 0); | |
3243 | unsigned int startoffset = 0; | |
3244 | ||
3245 | GET_BUFFER_SPACE (20); /* We might use less. */ | |
3246 | ||
3247 | if (lower_bound == 0) | |
3248 | { | |
3249 | /* A succeed_n that starts with 0 is really a | |
3250 | a simple on_failure_jump_loop. */ | |
3251 | INSERT_JUMP (on_failure_jump_loop, laststart, | |
3252 | b + 3 + nbytes); | |
3253 | b += 3; | |
3254 | } | |
3255 | else | |
3256 | { | |
3257 | /* Initialize lower bound of the `succeed_n', even | |
3258 | though it will be set during matching by its | |
3259 | attendant `set_number_at' (inserted next), | |
3260 | because `re_compile_fastmap' needs to know. | |
3261 | Jump to the `jump_n' we might insert below. */ | |
3262 | INSERT_JUMP2 (succeed_n, laststart, | |
3263 | b + 5 + nbytes, | |
3264 | lower_bound); | |
3265 | b += 5; | |
3266 | ||
3267 | /* Code to initialize the lower bound. Insert | |
3268 | before the `succeed_n'. The `5' is the last two | |
3269 | bytes of this `set_number_at', plus 3 bytes of | |
3270 | the following `succeed_n'. */ | |
3271 | insert_op2 (set_number_at, laststart, 5, lower_bound, b); | |
3272 | b += 5; | |
3273 | startoffset += 5; | |
3274 | } | |
3275 | ||
3276 | if (upper_bound < 0) | |
3277 | { | |
3278 | /* A negative upper bound stands for infinity, | |
3279 | in which case it degenerates to a plain jump. */ | |
3280 | STORE_JUMP (jump, b, laststart + startoffset); | |
3281 | b += 3; | |
3282 | } | |
3283 | else if (upper_bound > 1) | |
3284 | { /* More than one repetition is allowed, so | |
3285 | append a backward jump to the `succeed_n' | |
3286 | that starts this interval. | |
3287 | ||
3288 | When we've reached this during matching, | |
3289 | we'll have matched the interval once, so | |
3290 | jump back only `upper_bound - 1' times. */ | |
3291 | STORE_JUMP2 (jump_n, b, laststart + startoffset, | |
3292 | upper_bound - 1); | |
3293 | b += 5; | |
3294 | ||
3295 | /* The location we want to set is the second | |
3296 | parameter of the `jump_n'; that is `b-2' as | |
3297 | an absolute address. `laststart' will be | |
3298 | the `set_number_at' we're about to insert; | |
3299 | `laststart+3' the number to set, the source | |
3300 | for the relative address. But we are | |
3301 | inserting into the middle of the pattern -- | |
3302 | so everything is getting moved up by 5. | |
3303 | Conclusion: (b - 2) - (laststart + 3) + 5, | |
3304 | i.e., b - laststart. | |
3305 | ||
3306 | We insert this at the beginning of the loop | |
3307 | so that if we fail during matching, we'll | |
3308 | reinitialize the bounds. */ | |
3309 | insert_op2 (set_number_at, laststart, b - laststart, | |
3310 | upper_bound - 1, b); | |
3311 | b += 5; | |
3312 | } | |
3313 | } | |
25fe55af RS |
3314 | pending_exact = 0; |
3315 | beg_interval = NULL; | |
3316 | } | |
3317 | break; | |
3318 | ||
3319 | unfetch_interval: | |
3320 | /* If an invalid interval, match the characters as literals. */ | |
3321 | assert (beg_interval); | |
3322 | p = beg_interval; | |
3323 | beg_interval = NULL; | |
3324 | ||
3325 | /* normal_char and normal_backslash need `c'. */ | |
ed0767d8 | 3326 | c = '{'; |
25fe55af RS |
3327 | |
3328 | if (!(syntax & RE_NO_BK_BRACES)) | |
3329 | { | |
ed0767d8 SM |
3330 | assert (p > pattern && p[-1] == '\\'); |
3331 | goto normal_backslash; | |
25fe55af | 3332 | } |
ed0767d8 SM |
3333 | else |
3334 | goto normal_char; | |
e318085a | 3335 | |
b18215fc | 3336 | #ifdef emacs |
25fe55af RS |
3337 | /* There is no way to specify the before_dot and after_dot |
3338 | operators. rms says this is ok. --karl */ | |
3339 | case '=': | |
3340 | BUF_PUSH (at_dot); | |
3341 | break; | |
3342 | ||
3343 | case 's': | |
3344 | laststart = b; | |
3345 | PATFETCH (c); | |
3346 | BUF_PUSH_2 (syntaxspec, syntax_spec_code[c]); | |
3347 | break; | |
3348 | ||
3349 | case 'S': | |
3350 | laststart = b; | |
3351 | PATFETCH (c); | |
3352 | BUF_PUSH_2 (notsyntaxspec, syntax_spec_code[c]); | |
3353 | break; | |
b18215fc RS |
3354 | |
3355 | case 'c': | |
3356 | laststart = b; | |
36595814 | 3357 | PATFETCH (c); |
b18215fc RS |
3358 | BUF_PUSH_2 (categoryspec, c); |
3359 | break; | |
e318085a | 3360 | |
b18215fc RS |
3361 | case 'C': |
3362 | laststart = b; | |
36595814 | 3363 | PATFETCH (c); |
b18215fc RS |
3364 | BUF_PUSH_2 (notcategoryspec, c); |
3365 | break; | |
3366 | #endif /* emacs */ | |
e318085a | 3367 | |
e318085a | 3368 | |
25fe55af | 3369 | case 'w': |
4bb91c68 SM |
3370 | if (syntax & RE_NO_GNU_OPS) |
3371 | goto normal_char; | |
25fe55af | 3372 | laststart = b; |
1fb352e0 | 3373 | BUF_PUSH_2 (syntaxspec, Sword); |
25fe55af | 3374 | break; |
e318085a | 3375 | |
e318085a | 3376 | |
25fe55af | 3377 | case 'W': |
4bb91c68 SM |
3378 | if (syntax & RE_NO_GNU_OPS) |
3379 | goto normal_char; | |
25fe55af | 3380 | laststart = b; |
1fb352e0 | 3381 | BUF_PUSH_2 (notsyntaxspec, Sword); |
25fe55af | 3382 | break; |
e318085a RS |
3383 | |
3384 | ||
25fe55af | 3385 | case '<': |
4bb91c68 SM |
3386 | if (syntax & RE_NO_GNU_OPS) |
3387 | goto normal_char; | |
25fe55af RS |
3388 | BUF_PUSH (wordbeg); |
3389 | break; | |
e318085a | 3390 | |
25fe55af | 3391 | case '>': |
4bb91c68 SM |
3392 | if (syntax & RE_NO_GNU_OPS) |
3393 | goto normal_char; | |
25fe55af RS |
3394 | BUF_PUSH (wordend); |
3395 | break; | |
e318085a | 3396 | |
25fe55af | 3397 | case 'b': |
4bb91c68 SM |
3398 | if (syntax & RE_NO_GNU_OPS) |
3399 | goto normal_char; | |
25fe55af RS |
3400 | BUF_PUSH (wordbound); |
3401 | break; | |
e318085a | 3402 | |
25fe55af | 3403 | case 'B': |
4bb91c68 SM |
3404 | if (syntax & RE_NO_GNU_OPS) |
3405 | goto normal_char; | |
25fe55af RS |
3406 | BUF_PUSH (notwordbound); |
3407 | break; | |
fa9a63c5 | 3408 | |
25fe55af | 3409 | case '`': |
4bb91c68 SM |
3410 | if (syntax & RE_NO_GNU_OPS) |
3411 | goto normal_char; | |
25fe55af RS |
3412 | BUF_PUSH (begbuf); |
3413 | break; | |
e318085a | 3414 | |
25fe55af | 3415 | case '\'': |
4bb91c68 SM |
3416 | if (syntax & RE_NO_GNU_OPS) |
3417 | goto normal_char; | |
25fe55af RS |
3418 | BUF_PUSH (endbuf); |
3419 | break; | |
e318085a | 3420 | |
25fe55af RS |
3421 | case '1': case '2': case '3': case '4': case '5': |
3422 | case '6': case '7': case '8': case '9': | |
0cdd06f8 SM |
3423 | { |
3424 | regnum_t reg; | |
e318085a | 3425 | |
0cdd06f8 SM |
3426 | if (syntax & RE_NO_BK_REFS) |
3427 | goto normal_backslash; | |
e318085a | 3428 | |
0cdd06f8 | 3429 | reg = c - '0'; |
e318085a | 3430 | |
0cdd06f8 SM |
3431 | /* Can't back reference to a subexpression before its end. */ |
3432 | if (reg > regnum || group_in_compile_stack (compile_stack, reg)) | |
3433 | FREE_STACK_RETURN (REG_ESUBREG); | |
e318085a | 3434 | |
0cdd06f8 SM |
3435 | laststart = b; |
3436 | BUF_PUSH_2 (duplicate, reg); | |
3437 | } | |
25fe55af | 3438 | break; |
e318085a | 3439 | |
e318085a | 3440 | |
25fe55af RS |
3441 | case '+': |
3442 | case '?': | |
3443 | if (syntax & RE_BK_PLUS_QM) | |
3444 | goto handle_plus; | |
3445 | else | |
3446 | goto normal_backslash; | |
3447 | ||
3448 | default: | |
3449 | normal_backslash: | |
3450 | /* You might think it would be useful for \ to mean | |
3451 | not to translate; but if we don't translate it | |
4bb91c68 | 3452 | it will never match anything. */ |
25fe55af RS |
3453 | goto normal_char; |
3454 | } | |
3455 | break; | |
fa9a63c5 RM |
3456 | |
3457 | ||
3458 | default: | |
25fe55af | 3459 | /* Expects the character in `c'. */ |
fa9a63c5 | 3460 | normal_char: |
36595814 | 3461 | /* If no exactn currently being built. */ |
25fe55af | 3462 | if (!pending_exact |
fa9a63c5 | 3463 | |
25fe55af RS |
3464 | /* If last exactn not at current position. */ |
3465 | || pending_exact + *pending_exact + 1 != b | |
5e69f11e | 3466 | |
25fe55af | 3467 | /* We have only one byte following the exactn for the count. */ |
2d1675e4 | 3468 | || *pending_exact >= (1 << BYTEWIDTH) - MAX_MULTIBYTE_LENGTH |
fa9a63c5 | 3469 | |
25fe55af | 3470 | /* If followed by a repetition operator. */ |
9d99031f | 3471 | || (p != pend && (*p == '*' || *p == '^')) |
fa9a63c5 | 3472 | || ((syntax & RE_BK_PLUS_QM) |
9d99031f RS |
3473 | ? p + 1 < pend && *p == '\\' && (p[1] == '+' || p[1] == '?') |
3474 | : p != pend && (*p == '+' || *p == '?')) | |
fa9a63c5 | 3475 | || ((syntax & RE_INTERVALS) |
25fe55af | 3476 | && ((syntax & RE_NO_BK_BRACES) |
9d99031f RS |
3477 | ? p != pend && *p == '{' |
3478 | : p + 1 < pend && p[0] == '\\' && p[1] == '{'))) | |
fa9a63c5 RM |
3479 | { |
3480 | /* Start building a new exactn. */ | |
5e69f11e | 3481 | |
25fe55af | 3482 | laststart = b; |
fa9a63c5 RM |
3483 | |
3484 | BUF_PUSH_2 (exactn, 0); | |
3485 | pending_exact = b - 1; | |
25fe55af | 3486 | } |
5e69f11e | 3487 | |
2d1675e4 SM |
3488 | GET_BUFFER_SPACE (MAX_MULTIBYTE_LENGTH); |
3489 | { | |
e0277a47 KH |
3490 | int len; |
3491 | ||
36595814 | 3492 | c = TRANSLATE (c); |
e0277a47 KH |
3493 | if (multibyte) |
3494 | len = CHAR_STRING (c, b); | |
3495 | else | |
3496 | *b = c, len = 1; | |
2d1675e4 SM |
3497 | b += len; |
3498 | (*pending_exact) += len; | |
3499 | } | |
3500 | ||
fa9a63c5 | 3501 | break; |
25fe55af | 3502 | } /* switch (c) */ |
fa9a63c5 RM |
3503 | } /* while p != pend */ |
3504 | ||
5e69f11e | 3505 | |
fa9a63c5 | 3506 | /* Through the pattern now. */ |
5e69f11e | 3507 | |
505bde11 | 3508 | FIXUP_ALT_JUMP (); |
fa9a63c5 | 3509 | |
5e69f11e | 3510 | if (!COMPILE_STACK_EMPTY) |
fa9a63c5 RM |
3511 | FREE_STACK_RETURN (REG_EPAREN); |
3512 | ||
3513 | /* If we don't want backtracking, force success | |
3514 | the first time we reach the end of the compiled pattern. */ | |
3515 | if (syntax & RE_NO_POSIX_BACKTRACKING) | |
3516 | BUF_PUSH (succeed); | |
3517 | ||
3518 | free (compile_stack.stack); | |
3519 | ||
3520 | /* We have succeeded; set the length of the buffer. */ | |
3521 | bufp->used = b - bufp->buffer; | |
3522 | ||
3523 | #ifdef DEBUG | |
99633e97 | 3524 | if (debug > 0) |
fa9a63c5 | 3525 | { |
505bde11 | 3526 | re_compile_fastmap (bufp); |
fa9a63c5 RM |
3527 | DEBUG_PRINT1 ("\nCompiled pattern: \n"); |
3528 | print_compiled_pattern (bufp); | |
3529 | } | |
99633e97 | 3530 | debug--; |
fa9a63c5 RM |
3531 | #endif /* DEBUG */ |
3532 | ||
3533 | #ifndef MATCH_MAY_ALLOCATE | |
3534 | /* Initialize the failure stack to the largest possible stack. This | |
3535 | isn't necessary unless we're trying to avoid calling alloca in | |
3536 | the search and match routines. */ | |
3537 | { | |
3538 | int num_regs = bufp->re_nsub + 1; | |
3539 | ||
320a2a73 | 3540 | if (fail_stack.size < re_max_failures * TYPICAL_FAILURE_SIZE) |
fa9a63c5 | 3541 | { |
a26f4ccd | 3542 | fail_stack.size = re_max_failures * TYPICAL_FAILURE_SIZE; |
fa9a63c5 | 3543 | |
fa9a63c5 RM |
3544 | if (! fail_stack.stack) |
3545 | fail_stack.stack | |
5e69f11e | 3546 | = (fail_stack_elt_t *) malloc (fail_stack.size |
fa9a63c5 RM |
3547 | * sizeof (fail_stack_elt_t)); |
3548 | else | |
3549 | fail_stack.stack | |
3550 | = (fail_stack_elt_t *) realloc (fail_stack.stack, | |
3551 | (fail_stack.size | |
3552 | * sizeof (fail_stack_elt_t))); | |
fa9a63c5 RM |
3553 | } |
3554 | ||
3555 | regex_grow_registers (num_regs); | |
3556 | } | |
3557 | #endif /* not MATCH_MAY_ALLOCATE */ | |
3558 | ||
3559 | return REG_NOERROR; | |
3560 | } /* regex_compile */ | |
3561 | \f | |
3562 | /* Subroutines for `regex_compile'. */ | |
3563 | ||
25fe55af | 3564 | /* Store OP at LOC followed by two-byte integer parameter ARG. */ |
fa9a63c5 RM |
3565 | |
3566 | static void | |
3567 | store_op1 (op, loc, arg) | |
3568 | re_opcode_t op; | |
3569 | unsigned char *loc; | |
3570 | int arg; | |
3571 | { | |
3572 | *loc = (unsigned char) op; | |
3573 | STORE_NUMBER (loc + 1, arg); | |
3574 | } | |
3575 | ||
3576 | ||
3577 | /* Like `store_op1', but for two two-byte parameters ARG1 and ARG2. */ | |
3578 | ||
3579 | static void | |
3580 | store_op2 (op, loc, arg1, arg2) | |
3581 | re_opcode_t op; | |
3582 | unsigned char *loc; | |
3583 | int arg1, arg2; | |
3584 | { | |
3585 | *loc = (unsigned char) op; | |
3586 | STORE_NUMBER (loc + 1, arg1); | |
3587 | STORE_NUMBER (loc + 3, arg2); | |
3588 | } | |
3589 | ||
3590 | ||
3591 | /* Copy the bytes from LOC to END to open up three bytes of space at LOC | |
3592 | for OP followed by two-byte integer parameter ARG. */ | |
3593 | ||
3594 | static void | |
3595 | insert_op1 (op, loc, arg, end) | |
3596 | re_opcode_t op; | |
3597 | unsigned char *loc; | |
3598 | int arg; | |
5e69f11e | 3599 | unsigned char *end; |
fa9a63c5 RM |
3600 | { |
3601 | register unsigned char *pfrom = end; | |
3602 | register unsigned char *pto = end + 3; | |
3603 | ||
3604 | while (pfrom != loc) | |
3605 | *--pto = *--pfrom; | |
5e69f11e | 3606 | |
fa9a63c5 RM |
3607 | store_op1 (op, loc, arg); |
3608 | } | |
3609 | ||
3610 | ||
3611 | /* Like `insert_op1', but for two two-byte parameters ARG1 and ARG2. */ | |
3612 | ||
3613 | static void | |
3614 | insert_op2 (op, loc, arg1, arg2, end) | |
3615 | re_opcode_t op; | |
3616 | unsigned char *loc; | |
3617 | int arg1, arg2; | |
5e69f11e | 3618 | unsigned char *end; |
fa9a63c5 RM |
3619 | { |
3620 | register unsigned char *pfrom = end; | |
3621 | register unsigned char *pto = end + 5; | |
3622 | ||
3623 | while (pfrom != loc) | |
3624 | *--pto = *--pfrom; | |
5e69f11e | 3625 | |
fa9a63c5 RM |
3626 | store_op2 (op, loc, arg1, arg2); |
3627 | } | |
3628 | ||
3629 | ||
3630 | /* P points to just after a ^ in PATTERN. Return true if that ^ comes | |
3631 | after an alternative or a begin-subexpression. We assume there is at | |
3632 | least one character before the ^. */ | |
3633 | ||
3634 | static boolean | |
3635 | at_begline_loc_p (pattern, p, syntax) | |
01618498 | 3636 | re_char *pattern, *p; |
fa9a63c5 RM |
3637 | reg_syntax_t syntax; |
3638 | { | |
01618498 | 3639 | re_char *prev = p - 2; |
fa9a63c5 | 3640 | boolean prev_prev_backslash = prev > pattern && prev[-1] == '\\'; |
5e69f11e | 3641 | |
fa9a63c5 RM |
3642 | return |
3643 | /* After a subexpression? */ | |
3644 | (*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash)) | |
25fe55af | 3645 | /* After an alternative? */ |
d2af47df SM |
3646 | || (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash)) |
3647 | /* After a shy subexpression? */ | |
3648 | || ((syntax & RE_SHY_GROUPS) && prev - 2 >= pattern | |
3649 | && prev[-1] == '?' && prev[-2] == '(' | |
3650 | && (syntax & RE_NO_BK_PARENS | |
3651 | || (prev - 3 >= pattern && prev[-3] == '\\'))); | |
fa9a63c5 RM |
3652 | } |
3653 | ||
3654 | ||
3655 | /* The dual of at_begline_loc_p. This one is for $. We assume there is | |
3656 | at least one character after the $, i.e., `P < PEND'. */ | |
3657 | ||
3658 | static boolean | |
3659 | at_endline_loc_p (p, pend, syntax) | |
01618498 | 3660 | re_char *p, *pend; |
99633e97 | 3661 | reg_syntax_t syntax; |
fa9a63c5 | 3662 | { |
01618498 | 3663 | re_char *next = p; |
fa9a63c5 | 3664 | boolean next_backslash = *next == '\\'; |
01618498 | 3665 | re_char *next_next = p + 1 < pend ? p + 1 : 0; |
5e69f11e | 3666 | |
fa9a63c5 RM |
3667 | return |
3668 | /* Before a subexpression? */ | |
3669 | (syntax & RE_NO_BK_PARENS ? *next == ')' | |
25fe55af | 3670 | : next_backslash && next_next && *next_next == ')') |
fa9a63c5 RM |
3671 | /* Before an alternative? */ |
3672 | || (syntax & RE_NO_BK_VBAR ? *next == '|' | |
25fe55af | 3673 | : next_backslash && next_next && *next_next == '|'); |
fa9a63c5 RM |
3674 | } |
3675 | ||
3676 | ||
5e69f11e | 3677 | /* Returns true if REGNUM is in one of COMPILE_STACK's elements and |
fa9a63c5 RM |
3678 | false if it's not. */ |
3679 | ||
3680 | static boolean | |
3681 | group_in_compile_stack (compile_stack, regnum) | |
3682 | compile_stack_type compile_stack; | |
3683 | regnum_t regnum; | |
3684 | { | |
3685 | int this_element; | |
3686 | ||
5e69f11e RM |
3687 | for (this_element = compile_stack.avail - 1; |
3688 | this_element >= 0; | |
fa9a63c5 RM |
3689 | this_element--) |
3690 | if (compile_stack.stack[this_element].regnum == regnum) | |
3691 | return true; | |
3692 | ||
3693 | return false; | |
3694 | } | |
fa9a63c5 | 3695 | \f |
f6a3f532 SM |
3696 | /* analyse_first. |
3697 | If fastmap is non-NULL, go through the pattern and fill fastmap | |
3698 | with all the possible leading chars. If fastmap is NULL, don't | |
3699 | bother filling it up (obviously) and only return whether the | |
3700 | pattern could potentially match the empty string. | |
3701 | ||
3702 | Return 1 if p..pend might match the empty string. | |
3703 | Return 0 if p..pend matches at least one char. | |
01618498 | 3704 | Return -1 if fastmap was not updated accurately. */ |
f6a3f532 SM |
3705 | |
3706 | static int | |
3707 | analyse_first (p, pend, fastmap, multibyte) | |
01618498 | 3708 | re_char *p, *pend; |
f6a3f532 SM |
3709 | char *fastmap; |
3710 | const int multibyte; | |
fa9a63c5 | 3711 | { |
505bde11 | 3712 | int j, k; |
1fb352e0 | 3713 | boolean not; |
fa9a63c5 | 3714 | |
b18215fc | 3715 | /* If all elements for base leading-codes in fastmap is set, this |
25fe55af | 3716 | flag is set true. */ |
b18215fc RS |
3717 | boolean match_any_multibyte_characters = false; |
3718 | ||
f6a3f532 | 3719 | assert (p); |
5e69f11e | 3720 | |
505bde11 SM |
3721 | /* The loop below works as follows: |
3722 | - It has a working-list kept in the PATTERN_STACK and which basically | |
3723 | starts by only containing a pointer to the first operation. | |
3724 | - If the opcode we're looking at is a match against some set of | |
3725 | chars, then we add those chars to the fastmap and go on to the | |
3726 | next work element from the worklist (done via `break'). | |
3727 | - If the opcode is a control operator on the other hand, we either | |
3728 | ignore it (if it's meaningless at this point, such as `start_memory') | |
3729 | or execute it (if it's a jump). If the jump has several destinations | |
3730 | (i.e. `on_failure_jump'), then we push the other destination onto the | |
3731 | worklist. | |
3732 | We guarantee termination by ignoring backward jumps (more or less), | |
3733 | so that `p' is monotonically increasing. More to the point, we | |
3734 | never set `p' (or push) anything `<= p1'. */ | |
3735 | ||
01618498 | 3736 | while (p < pend) |
fa9a63c5 | 3737 | { |
505bde11 SM |
3738 | /* `p1' is used as a marker of how far back a `on_failure_jump' |
3739 | can go without being ignored. It is normally equal to `p' | |
3740 | (which prevents any backward `on_failure_jump') except right | |
3741 | after a plain `jump', to allow patterns such as: | |
3742 | 0: jump 10 | |
3743 | 3..9: <body> | |
3744 | 10: on_failure_jump 3 | |
3745 | as used for the *? operator. */ | |
01618498 | 3746 | re_char *p1 = p; |
5e69f11e | 3747 | |
fa9a63c5 RM |
3748 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++)) |
3749 | { | |
f6a3f532 | 3750 | case succeed: |
01618498 | 3751 | return 1; |
f6a3f532 | 3752 | continue; |
fa9a63c5 | 3753 | |
fa9a63c5 | 3754 | case duplicate: |
505bde11 SM |
3755 | /* If the first character has to match a backreference, that means |
3756 | that the group was empty (since it already matched). Since this | |
3757 | is the only case that interests us here, we can assume that the | |
3758 | backreference must match the empty string. */ | |
3759 | p++; | |
3760 | continue; | |
fa9a63c5 RM |
3761 | |
3762 | ||
3763 | /* Following are the cases which match a character. These end | |
25fe55af | 3764 | with `break'. */ |
fa9a63c5 RM |
3765 | |
3766 | case exactn: | |
e0277a47 KH |
3767 | if (fastmap) |
3768 | { | |
3769 | int c = RE_STRING_CHAR (p + 1, pend - p); | |
3770 | ||
3771 | if (SINGLE_BYTE_CHAR_P (c)) | |
3772 | fastmap[c] = 1; | |
3773 | else | |
3774 | fastmap[p[1]] = 1; | |
3775 | } | |
fa9a63c5 RM |
3776 | break; |
3777 | ||
3778 | ||
1fb352e0 SM |
3779 | case anychar: |
3780 | /* We could put all the chars except for \n (and maybe \0) | |
3781 | but we don't bother since it is generally not worth it. */ | |
f6a3f532 | 3782 | if (!fastmap) break; |
01618498 | 3783 | return -1; |
fa9a63c5 RM |
3784 | |
3785 | ||
b18215fc | 3786 | case charset_not: |
ba5c004d RS |
3787 | /* Chars beyond end of bitmap are possible matches. |
3788 | All the single-byte codes can occur in multibyte buffers. | |
3789 | So any that are not listed in the charset | |
3790 | are possible matches, even in multibyte buffers. */ | |
1fb352e0 | 3791 | if (!fastmap) break; |
b18215fc | 3792 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH; |
1fb352e0 | 3793 | j < (1 << BYTEWIDTH); j++) |
b18215fc | 3794 | fastmap[j] = 1; |
1fb352e0 SM |
3795 | /* Fallthrough */ |
3796 | case charset: | |
3797 | if (!fastmap) break; | |
3798 | not = (re_opcode_t) *(p - 1) == charset_not; | |
b18215fc RS |
3799 | for (j = CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH - 1, p++; |
3800 | j >= 0; j--) | |
1fb352e0 | 3801 | if (!!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))) ^ not) |
b18215fc RS |
3802 | fastmap[j] = 1; |
3803 | ||
1fb352e0 SM |
3804 | if ((not && multibyte) |
3805 | /* Any character set can possibly contain a character | |
3806 | which doesn't match the specified set of characters. */ | |
3807 | || (CHARSET_RANGE_TABLE_EXISTS_P (&p[-2]) | |
3808 | && CHARSET_RANGE_TABLE_BITS (&p[-2]) != 0)) | |
3809 | /* If we can match a character class, we can match | |
3810 | any character set. */ | |
b18215fc RS |
3811 | { |
3812 | set_fastmap_for_multibyte_characters: | |
3813 | if (match_any_multibyte_characters == false) | |
3814 | { | |
3815 | for (j = 0x80; j < 0xA0; j++) /* XXX */ | |
3816 | if (BASE_LEADING_CODE_P (j)) | |
3817 | fastmap[j] = 1; | |
3818 | match_any_multibyte_characters = true; | |
3819 | } | |
3820 | } | |
b18215fc | 3821 | |
1fb352e0 SM |
3822 | else if (!not && CHARSET_RANGE_TABLE_EXISTS_P (&p[-2]) |
3823 | && match_any_multibyte_characters == false) | |
3824 | { | |
3825 | /* Set fastmap[I] 1 where I is a base leading code of each | |
3826 | multibyte character in the range table. */ | |
3827 | int c, count; | |
b18215fc | 3828 | |
1fb352e0 | 3829 | /* Make P points the range table. `+ 2' is to skip flag |
0b32bf0e | 3830 | bits for a character class. */ |
1fb352e0 | 3831 | p += CHARSET_BITMAP_SIZE (&p[-2]) + 2; |
b18215fc | 3832 | |
1fb352e0 SM |
3833 | /* Extract the number of ranges in range table into COUNT. */ |
3834 | EXTRACT_NUMBER_AND_INCR (count, p); | |
3835 | for (; count > 0; count--, p += 2 * 3) /* XXX */ | |
3836 | { | |
3837 | /* Extract the start of each range. */ | |
3838 | EXTRACT_CHARACTER (c, p); | |
3839 | j = CHAR_CHARSET (c); | |
3840 | fastmap[CHARSET_LEADING_CODE_BASE (j)] = 1; | |
3841 | } | |
3842 | } | |
b18215fc RS |
3843 | break; |
3844 | ||
1fb352e0 SM |
3845 | case syntaxspec: |
3846 | case notsyntaxspec: | |
3847 | if (!fastmap) break; | |
3848 | #ifndef emacs | |
3849 | not = (re_opcode_t)p[-1] == notsyntaxspec; | |
3850 | k = *p++; | |
3851 | for (j = 0; j < (1 << BYTEWIDTH); j++) | |
990b2375 | 3852 | if ((SYNTAX (j) == (enum syntaxcode) k) ^ not) |
b18215fc | 3853 | fastmap[j] = 1; |
b18215fc | 3854 | break; |
1fb352e0 | 3855 | #else /* emacs */ |
b18215fc RS |
3856 | /* This match depends on text properties. These end with |
3857 | aborting optimizations. */ | |
01618498 | 3858 | return -1; |
b18215fc RS |
3859 | |
3860 | case categoryspec: | |
b18215fc | 3861 | case notcategoryspec: |
1fb352e0 SM |
3862 | if (!fastmap) break; |
3863 | not = (re_opcode_t)p[-1] == notcategoryspec; | |
b18215fc | 3864 | k = *p++; |
1fb352e0 SM |
3865 | for (j = 0; j < (1 << BYTEWIDTH); j++) |
3866 | if ((CHAR_HAS_CATEGORY (j, k)) ^ not) | |
b18215fc RS |
3867 | fastmap[j] = 1; |
3868 | ||
1fb352e0 | 3869 | if (multibyte) |
b18215fc | 3870 | /* Any character set can possibly contain a character |
1fb352e0 | 3871 | whose category is K (or not). */ |
b18215fc RS |
3872 | goto set_fastmap_for_multibyte_characters; |
3873 | break; | |
3874 | ||
fa9a63c5 | 3875 | /* All cases after this match the empty string. These end with |
25fe55af | 3876 | `continue'. */ |
fa9a63c5 | 3877 | |
fa9a63c5 RM |
3878 | case before_dot: |
3879 | case at_dot: | |
3880 | case after_dot: | |
1fb352e0 | 3881 | #endif /* !emacs */ |
25fe55af RS |
3882 | case no_op: |
3883 | case begline: | |
3884 | case endline: | |
fa9a63c5 RM |
3885 | case begbuf: |
3886 | case endbuf: | |
3887 | case wordbound: | |
3888 | case notwordbound: | |
3889 | case wordbeg: | |
3890 | case wordend: | |
25fe55af | 3891 | continue; |
fa9a63c5 RM |
3892 | |
3893 | ||
fa9a63c5 | 3894 | case jump: |
25fe55af | 3895 | EXTRACT_NUMBER_AND_INCR (j, p); |
505bde11 SM |
3896 | if (j < 0) |
3897 | /* Backward jumps can only go back to code that we've already | |
3898 | visited. `re_compile' should make sure this is true. */ | |
3899 | break; | |
25fe55af | 3900 | p += j; |
505bde11 SM |
3901 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p)) |
3902 | { | |
3903 | case on_failure_jump: | |
3904 | case on_failure_keep_string_jump: | |
505bde11 | 3905 | case on_failure_jump_loop: |
0683b6fa | 3906 | case on_failure_jump_nastyloop: |
505bde11 SM |
3907 | case on_failure_jump_smart: |
3908 | p++; | |
3909 | break; | |
3910 | default: | |
3911 | continue; | |
3912 | }; | |
3913 | /* Keep `p1' to allow the `on_failure_jump' we are jumping to | |
3914 | to jump back to "just after here". */ | |
3915 | /* Fallthrough */ | |
fa9a63c5 | 3916 | |
25fe55af RS |
3917 | case on_failure_jump: |
3918 | case on_failure_keep_string_jump: | |
0683b6fa | 3919 | case on_failure_jump_nastyloop: |
505bde11 SM |
3920 | case on_failure_jump_loop: |
3921 | case on_failure_jump_smart: | |
25fe55af | 3922 | EXTRACT_NUMBER_AND_INCR (j, p); |
505bde11 | 3923 | if (p + j <= p1) |
ed0767d8 | 3924 | ; /* Backward jump to be ignored. */ |
01618498 SM |
3925 | else |
3926 | { /* We have to look down both arms. | |
3927 | We first go down the "straight" path so as to minimize | |
3928 | stack usage when going through alternatives. */ | |
3929 | int r = analyse_first (p, pend, fastmap, multibyte); | |
3930 | if (r) return r; | |
3931 | p += j; | |
3932 | } | |
25fe55af | 3933 | continue; |
fa9a63c5 RM |
3934 | |
3935 | ||
ed0767d8 SM |
3936 | case jump_n: |
3937 | /* This code simply does not properly handle forward jump_n. */ | |
3938 | DEBUG_STATEMENT (EXTRACT_NUMBER (j, p); assert (j < 0)); | |
3939 | p += 4; | |
3940 | /* jump_n can either jump or fall through. The (backward) jump | |
3941 | case has already been handled, so we only need to look at the | |
3942 | fallthrough case. */ | |
3943 | continue; | |
177c0ea7 | 3944 | |
fa9a63c5 | 3945 | case succeed_n: |
ed0767d8 SM |
3946 | /* If N == 0, it should be an on_failure_jump_loop instead. */ |
3947 | DEBUG_STATEMENT (EXTRACT_NUMBER (j, p + 2); assert (j > 0)); | |
3948 | p += 4; | |
3949 | /* We only care about one iteration of the loop, so we don't | |
3950 | need to consider the case where this behaves like an | |
3951 | on_failure_jump. */ | |
25fe55af | 3952 | continue; |
fa9a63c5 RM |
3953 | |
3954 | ||
3955 | case set_number_at: | |
25fe55af RS |
3956 | p += 4; |
3957 | continue; | |
fa9a63c5 RM |
3958 | |
3959 | ||
3960 | case start_memory: | |
25fe55af | 3961 | case stop_memory: |
505bde11 | 3962 | p += 1; |
fa9a63c5 RM |
3963 | continue; |
3964 | ||
3965 | ||
3966 | default: | |
25fe55af RS |
3967 | abort (); /* We have listed all the cases. */ |
3968 | } /* switch *p++ */ | |
fa9a63c5 RM |
3969 | |
3970 | /* Getting here means we have found the possible starting | |
25fe55af | 3971 | characters for one path of the pattern -- and that the empty |
01618498 SM |
3972 | string does not match. We need not follow this path further. */ |
3973 | return 0; | |
fa9a63c5 RM |
3974 | } /* while p */ |
3975 | ||
01618498 SM |
3976 | /* We reached the end without matching anything. */ |
3977 | return 1; | |
3978 | ||
f6a3f532 SM |
3979 | } /* analyse_first */ |
3980 | \f | |
3981 | /* re_compile_fastmap computes a ``fastmap'' for the compiled pattern in | |
3982 | BUFP. A fastmap records which of the (1 << BYTEWIDTH) possible | |
3983 | characters can start a string that matches the pattern. This fastmap | |
3984 | is used by re_search to skip quickly over impossible starting points. | |
3985 | ||
3986 | Character codes above (1 << BYTEWIDTH) are not represented in the | |
3987 | fastmap, but the leading codes are represented. Thus, the fastmap | |
3988 | indicates which character sets could start a match. | |
3989 | ||
3990 | The caller must supply the address of a (1 << BYTEWIDTH)-byte data | |
3991 | area as BUFP->fastmap. | |
3992 | ||
3993 | We set the `fastmap', `fastmap_accurate', and `can_be_null' fields in | |
3994 | the pattern buffer. | |
3995 | ||
3996 | Returns 0 if we succeed, -2 if an internal error. */ | |
3997 | ||
3998 | int | |
3999 | re_compile_fastmap (bufp) | |
4000 | struct re_pattern_buffer *bufp; | |
4001 | { | |
4002 | char *fastmap = bufp->fastmap; | |
4003 | int analysis; | |
4004 | ||
4005 | assert (fastmap && bufp->buffer); | |
4006 | ||
4007 | bzero (fastmap, 1 << BYTEWIDTH); /* Assume nothing's valid. */ | |
4008 | bufp->fastmap_accurate = 1; /* It will be when we're done. */ | |
4009 | ||
4010 | analysis = analyse_first (bufp->buffer, bufp->buffer + bufp->used, | |
2d1675e4 | 4011 | fastmap, RE_MULTIBYTE_P (bufp)); |
c0f9ea08 | 4012 | bufp->can_be_null = (analysis != 0); |
fa9a63c5 RM |
4013 | return 0; |
4014 | } /* re_compile_fastmap */ | |
4015 | \f | |
4016 | /* Set REGS to hold NUM_REGS registers, storing them in STARTS and | |
4017 | ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use | |
4018 | this memory for recording register information. STARTS and ENDS | |
4019 | must be allocated using the malloc library routine, and must each | |
4020 | be at least NUM_REGS * sizeof (regoff_t) bytes long. | |
4021 | ||
4022 | If NUM_REGS == 0, then subsequent matches should allocate their own | |
4023 | register data. | |
4024 | ||
4025 | Unless this function is called, the first search or match using | |
4026 | PATTERN_BUFFER will allocate its own register data, without | |
4027 | freeing the old data. */ | |
4028 | ||
4029 | void | |
4030 | re_set_registers (bufp, regs, num_regs, starts, ends) | |
4031 | struct re_pattern_buffer *bufp; | |
4032 | struct re_registers *regs; | |
4033 | unsigned num_regs; | |
4034 | regoff_t *starts, *ends; | |
4035 | { | |
4036 | if (num_regs) | |
4037 | { | |
4038 | bufp->regs_allocated = REGS_REALLOCATE; | |
4039 | regs->num_regs = num_regs; | |
4040 | regs->start = starts; | |
4041 | regs->end = ends; | |
4042 | } | |
4043 | else | |
4044 | { | |
4045 | bufp->regs_allocated = REGS_UNALLOCATED; | |
4046 | regs->num_regs = 0; | |
4047 | regs->start = regs->end = (regoff_t *) 0; | |
4048 | } | |
4049 | } | |
c0f9ea08 | 4050 | WEAK_ALIAS (__re_set_registers, re_set_registers) |
fa9a63c5 | 4051 | \f |
25fe55af | 4052 | /* Searching routines. */ |
fa9a63c5 RM |
4053 | |
4054 | /* Like re_search_2, below, but only one string is specified, and | |
4055 | doesn't let you say where to stop matching. */ | |
4056 | ||
4057 | int | |
4058 | re_search (bufp, string, size, startpos, range, regs) | |
4059 | struct re_pattern_buffer *bufp; | |
4060 | const char *string; | |
4061 | int size, startpos, range; | |
4062 | struct re_registers *regs; | |
4063 | { | |
5e69f11e | 4064 | return re_search_2 (bufp, NULL, 0, string, size, startpos, range, |
fa9a63c5 RM |
4065 | regs, size); |
4066 | } | |
c0f9ea08 | 4067 | WEAK_ALIAS (__re_search, re_search) |
fa9a63c5 | 4068 | |
70806df6 KH |
4069 | /* Head address of virtual concatenation of string. */ |
4070 | #define HEAD_ADDR_VSTRING(P) \ | |
4071 | (((P) >= size1 ? string2 : string1)) | |
4072 | ||
b18215fc RS |
4073 | /* End address of virtual concatenation of string. */ |
4074 | #define STOP_ADDR_VSTRING(P) \ | |
4075 | (((P) >= size1 ? string2 + size2 : string1 + size1)) | |
4076 | ||
4077 | /* Address of POS in the concatenation of virtual string. */ | |
4078 | #define POS_ADDR_VSTRING(POS) \ | |
4079 | (((POS) >= size1 ? string2 - size1 : string1) + (POS)) | |
fa9a63c5 RM |
4080 | |
4081 | /* Using the compiled pattern in BUFP->buffer, first tries to match the | |
4082 | virtual concatenation of STRING1 and STRING2, starting first at index | |
4083 | STARTPOS, then at STARTPOS + 1, and so on. | |
5e69f11e | 4084 | |
fa9a63c5 | 4085 | STRING1 and STRING2 have length SIZE1 and SIZE2, respectively. |
5e69f11e | 4086 | |
fa9a63c5 RM |
4087 | RANGE is how far to scan while trying to match. RANGE = 0 means try |
4088 | only at STARTPOS; in general, the last start tried is STARTPOS + | |
4089 | RANGE. | |
5e69f11e | 4090 | |
fa9a63c5 RM |
4091 | In REGS, return the indices of the virtual concatenation of STRING1 |
4092 | and STRING2 that matched the entire BUFP->buffer and its contained | |
4093 | subexpressions. | |
5e69f11e | 4094 | |
fa9a63c5 RM |
4095 | Do not consider matching one past the index STOP in the virtual |
4096 | concatenation of STRING1 and STRING2. | |
4097 | ||
4098 | We return either the position in the strings at which the match was | |
4099 | found, -1 if no match, or -2 if error (such as failure | |
4100 | stack overflow). */ | |
4101 | ||
4102 | int | |
66f0296e | 4103 | re_search_2 (bufp, str1, size1, str2, size2, startpos, range, regs, stop) |
fa9a63c5 | 4104 | struct re_pattern_buffer *bufp; |
66f0296e | 4105 | const char *str1, *str2; |
fa9a63c5 RM |
4106 | int size1, size2; |
4107 | int startpos; | |
4108 | int range; | |
4109 | struct re_registers *regs; | |
4110 | int stop; | |
4111 | { | |
4112 | int val; | |
66f0296e SM |
4113 | re_char *string1 = (re_char*) str1; |
4114 | re_char *string2 = (re_char*) str2; | |
fa9a63c5 | 4115 | register char *fastmap = bufp->fastmap; |
6676cb1c | 4116 | register RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 RM |
4117 | int total_size = size1 + size2; |
4118 | int endpos = startpos + range; | |
c0f9ea08 | 4119 | boolean anchored_start; |
fa9a63c5 | 4120 | |
25fe55af | 4121 | /* Nonzero if we have to concern multibyte character. */ |
2d1675e4 | 4122 | const boolean multibyte = RE_MULTIBYTE_P (bufp); |
b18215fc | 4123 | |
fa9a63c5 RM |
4124 | /* Check for out-of-range STARTPOS. */ |
4125 | if (startpos < 0 || startpos > total_size) | |
4126 | return -1; | |
5e69f11e | 4127 | |
fa9a63c5 | 4128 | /* Fix up RANGE if it might eventually take us outside |
34597fa9 | 4129 | the virtual concatenation of STRING1 and STRING2. |
5e69f11e | 4130 | Make sure we won't move STARTPOS below 0 or above TOTAL_SIZE. */ |
34597fa9 RS |
4131 | if (endpos < 0) |
4132 | range = 0 - startpos; | |
fa9a63c5 RM |
4133 | else if (endpos > total_size) |
4134 | range = total_size - startpos; | |
4135 | ||
4136 | /* If the search isn't to be a backwards one, don't waste time in a | |
7b140fd7 | 4137 | search for a pattern anchored at beginning of buffer. */ |
fa9a63c5 RM |
4138 | if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == begbuf && range > 0) |
4139 | { | |
4140 | if (startpos > 0) | |
4141 | return -1; | |
4142 | else | |
7b140fd7 | 4143 | range = 0; |
fa9a63c5 RM |
4144 | } |
4145 | ||
ae4788a8 RS |
4146 | #ifdef emacs |
4147 | /* In a forward search for something that starts with \=. | |
4148 | don't keep searching past point. */ | |
4149 | if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == at_dot && range > 0) | |
4150 | { | |
7b140fd7 RS |
4151 | range = PT_BYTE - BEGV_BYTE - startpos; |
4152 | if (range < 0) | |
ae4788a8 RS |
4153 | return -1; |
4154 | } | |
4155 | #endif /* emacs */ | |
4156 | ||
fa9a63c5 RM |
4157 | /* Update the fastmap now if not correct already. */ |
4158 | if (fastmap && !bufp->fastmap_accurate) | |
01618498 | 4159 | re_compile_fastmap (bufp); |
5e69f11e | 4160 | |
c8499ba5 | 4161 | /* See whether the pattern is anchored. */ |
c0f9ea08 | 4162 | anchored_start = (bufp->buffer[0] == begline); |
c8499ba5 | 4163 | |
b18215fc | 4164 | #ifdef emacs |
cc9b4df2 KH |
4165 | gl_state.object = re_match_object; |
4166 | { | |
99633e97 | 4167 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (POS_AS_IN_BUFFER (startpos)); |
cc9b4df2 KH |
4168 | |
4169 | SETUP_SYNTAX_TABLE_FOR_OBJECT (re_match_object, charpos, 1); | |
4170 | } | |
b18215fc RS |
4171 | #endif |
4172 | ||
fa9a63c5 RM |
4173 | /* Loop through the string, looking for a place to start matching. */ |
4174 | for (;;) | |
5e69f11e | 4175 | { |
c8499ba5 RS |
4176 | /* If the pattern is anchored, |
4177 | skip quickly past places we cannot match. | |
4178 | We don't bother to treat startpos == 0 specially | |
4179 | because that case doesn't repeat. */ | |
4180 | if (anchored_start && startpos > 0) | |
4181 | { | |
c0f9ea08 SM |
4182 | if (! ((startpos <= size1 ? string1[startpos - 1] |
4183 | : string2[startpos - size1 - 1]) | |
4184 | == '\n')) | |
c8499ba5 RS |
4185 | goto advance; |
4186 | } | |
4187 | ||
fa9a63c5 | 4188 | /* If a fastmap is supplied, skip quickly over characters that |
25fe55af RS |
4189 | cannot be the start of a match. If the pattern can match the |
4190 | null string, however, we don't need to skip characters; we want | |
4191 | the first null string. */ | |
fa9a63c5 RM |
4192 | if (fastmap && startpos < total_size && !bufp->can_be_null) |
4193 | { | |
66f0296e | 4194 | register re_char *d; |
01618498 | 4195 | register re_wchar_t buf_ch; |
e934739e RS |
4196 | |
4197 | d = POS_ADDR_VSTRING (startpos); | |
4198 | ||
25fe55af | 4199 | if (range > 0) /* Searching forwards. */ |
fa9a63c5 | 4200 | { |
fa9a63c5 RM |
4201 | register int lim = 0; |
4202 | int irange = range; | |
4203 | ||
25fe55af RS |
4204 | if (startpos < size1 && startpos + range >= size1) |
4205 | lim = range - (size1 - startpos); | |
fa9a63c5 | 4206 | |
25fe55af RS |
4207 | /* Written out as an if-else to avoid testing `translate' |
4208 | inside the loop. */ | |
28ae27ae AS |
4209 | if (RE_TRANSLATE_P (translate)) |
4210 | { | |
e934739e RS |
4211 | if (multibyte) |
4212 | while (range > lim) | |
4213 | { | |
4214 | int buf_charlen; | |
4215 | ||
4216 | buf_ch = STRING_CHAR_AND_LENGTH (d, range - lim, | |
4217 | buf_charlen); | |
4218 | ||
4219 | buf_ch = RE_TRANSLATE (translate, buf_ch); | |
4220 | if (buf_ch >= 0400 | |
4221 | || fastmap[buf_ch]) | |
4222 | break; | |
4223 | ||
4224 | range -= buf_charlen; | |
4225 | d += buf_charlen; | |
4226 | } | |
4227 | else | |
4228 | while (range > lim | |
66f0296e | 4229 | && !fastmap[RE_TRANSLATE (translate, *d)]) |
33c46939 RS |
4230 | { |
4231 | d++; | |
4232 | range--; | |
4233 | } | |
e934739e | 4234 | } |
fa9a63c5 | 4235 | else |
66f0296e | 4236 | while (range > lim && !fastmap[*d]) |
33c46939 RS |
4237 | { |
4238 | d++; | |
4239 | range--; | |
4240 | } | |
fa9a63c5 RM |
4241 | |
4242 | startpos += irange - range; | |
4243 | } | |
25fe55af | 4244 | else /* Searching backwards. */ |
fa9a63c5 | 4245 | { |
2d1675e4 SM |
4246 | int room = (startpos >= size1 |
4247 | ? size2 + size1 - startpos | |
4248 | : size1 - startpos); | |
4249 | buf_ch = RE_STRING_CHAR (d, room); | |
4250 | buf_ch = TRANSLATE (buf_ch); | |
fa9a63c5 | 4251 | |
e934739e RS |
4252 | if (! (buf_ch >= 0400 |
4253 | || fastmap[buf_ch])) | |
fa9a63c5 RM |
4254 | goto advance; |
4255 | } | |
4256 | } | |
4257 | ||
4258 | /* If can't match the null string, and that's all we have left, fail. */ | |
4259 | if (range >= 0 && startpos == total_size && fastmap | |
25fe55af | 4260 | && !bufp->can_be_null) |
fa9a63c5 RM |
4261 | return -1; |
4262 | ||
4263 | val = re_match_2_internal (bufp, string1, size1, string2, size2, | |
4264 | startpos, regs, stop); | |
4265 | #ifndef REGEX_MALLOC | |
0b32bf0e | 4266 | # ifdef C_ALLOCA |
fa9a63c5 | 4267 | alloca (0); |
0b32bf0e | 4268 | # endif |
fa9a63c5 RM |
4269 | #endif |
4270 | ||
4271 | if (val >= 0) | |
4272 | return startpos; | |
5e69f11e | 4273 | |
fa9a63c5 RM |
4274 | if (val == -2) |
4275 | return -2; | |
4276 | ||
4277 | advance: | |
5e69f11e | 4278 | if (!range) |
25fe55af | 4279 | break; |
5e69f11e | 4280 | else if (range > 0) |
25fe55af | 4281 | { |
b18215fc RS |
4282 | /* Update STARTPOS to the next character boundary. */ |
4283 | if (multibyte) | |
4284 | { | |
66f0296e SM |
4285 | re_char *p = POS_ADDR_VSTRING (startpos); |
4286 | re_char *pend = STOP_ADDR_VSTRING (startpos); | |
b18215fc RS |
4287 | int len = MULTIBYTE_FORM_LENGTH (p, pend - p); |
4288 | ||
4289 | range -= len; | |
4290 | if (range < 0) | |
4291 | break; | |
4292 | startpos += len; | |
4293 | } | |
4294 | else | |
4295 | { | |
b560c397 RS |
4296 | range--; |
4297 | startpos++; | |
4298 | } | |
e318085a | 4299 | } |
fa9a63c5 | 4300 | else |
25fe55af RS |
4301 | { |
4302 | range++; | |
4303 | startpos--; | |
b18215fc RS |
4304 | |
4305 | /* Update STARTPOS to the previous character boundary. */ | |
4306 | if (multibyte) | |
4307 | { | |
70806df6 KH |
4308 | re_char *p = POS_ADDR_VSTRING (startpos) + 1; |
4309 | re_char *p0 = p; | |
4310 | re_char *phead = HEAD_ADDR_VSTRING (startpos); | |
b18215fc RS |
4311 | |
4312 | /* Find the head of multibyte form. */ | |
70806df6 KH |
4313 | PREV_CHAR_BOUNDARY (p, phead); |
4314 | range += p0 - 1 - p; | |
4315 | if (range > 0) | |
4316 | break; | |
b18215fc | 4317 | |
70806df6 | 4318 | startpos -= p0 - 1 - p; |
b18215fc | 4319 | } |
25fe55af | 4320 | } |
fa9a63c5 RM |
4321 | } |
4322 | return -1; | |
4323 | } /* re_search_2 */ | |
c0f9ea08 | 4324 | WEAK_ALIAS (__re_search_2, re_search_2) |
fa9a63c5 RM |
4325 | \f |
4326 | /* Declarations and macros for re_match_2. */ | |
4327 | ||
2d1675e4 SM |
4328 | static int bcmp_translate _RE_ARGS((re_char *s1, re_char *s2, |
4329 | register int len, | |
4330 | RE_TRANSLATE_TYPE translate, | |
4331 | const int multibyte)); | |
fa9a63c5 RM |
4332 | |
4333 | /* This converts PTR, a pointer into one of the search strings `string1' | |
4334 | and `string2' into an offset from the beginning of that string. */ | |
4335 | #define POINTER_TO_OFFSET(ptr) \ | |
4336 | (FIRST_STRING_P (ptr) \ | |
4337 | ? ((regoff_t) ((ptr) - string1)) \ | |
4338 | : ((regoff_t) ((ptr) - string2 + size1))) | |
4339 | ||
fa9a63c5 | 4340 | /* Call before fetching a character with *d. This switches over to |
419d1c74 SM |
4341 | string2 if necessary. |
4342 | Check re_match_2_internal for a discussion of why end_match_2 might | |
4343 | not be within string2 (but be equal to end_match_1 instead). */ | |
fa9a63c5 | 4344 | #define PREFETCH() \ |
25fe55af | 4345 | while (d == dend) \ |
fa9a63c5 RM |
4346 | { \ |
4347 | /* End of string2 => fail. */ \ | |
25fe55af RS |
4348 | if (dend == end_match_2) \ |
4349 | goto fail; \ | |
4bb91c68 | 4350 | /* End of string1 => advance to string2. */ \ |
25fe55af | 4351 | d = string2; \ |
fa9a63c5 RM |
4352 | dend = end_match_2; \ |
4353 | } | |
4354 | ||
f1ad044f SM |
4355 | /* Call before fetching a char with *d if you already checked other limits. |
4356 | This is meant for use in lookahead operations like wordend, etc.. | |
4357 | where we might need to look at parts of the string that might be | |
4358 | outside of the LIMITs (i.e past `stop'). */ | |
4359 | #define PREFETCH_NOLIMIT() \ | |
4360 | if (d == end1) \ | |
4361 | { \ | |
4362 | d = string2; \ | |
4363 | dend = end_match_2; \ | |
4364 | } \ | |
fa9a63c5 RM |
4365 | |
4366 | /* Test if at very beginning or at very end of the virtual concatenation | |
25fe55af | 4367 | of `string1' and `string2'. If only one string, it's `string2'. */ |
fa9a63c5 | 4368 | #define AT_STRINGS_BEG(d) ((d) == (size1 ? string1 : string2) || !size2) |
5e69f11e | 4369 | #define AT_STRINGS_END(d) ((d) == end2) |
fa9a63c5 RM |
4370 | |
4371 | ||
4372 | /* Test if D points to a character which is word-constituent. We have | |
4373 | two special cases to check for: if past the end of string1, look at | |
4374 | the first character in string2; and if before the beginning of | |
4375 | string2, look at the last character in string1. */ | |
4376 | #define WORDCHAR_P(d) \ | |
4377 | (SYNTAX ((d) == end1 ? *string2 \ | |
25fe55af | 4378 | : (d) == string2 - 1 ? *(end1 - 1) : *(d)) \ |
fa9a63c5 RM |
4379 | == Sword) |
4380 | ||
9121ca40 | 4381 | /* Disabled due to a compiler bug -- see comment at case wordbound */ |
b18215fc RS |
4382 | |
4383 | /* The comment at case wordbound is following one, but we don't use | |
4384 | AT_WORD_BOUNDARY anymore to support multibyte form. | |
4385 | ||
4386 | The DEC Alpha C compiler 3.x generates incorrect code for the | |
25fe55af RS |
4387 | test WORDCHAR_P (d - 1) != WORDCHAR_P (d) in the expansion of |
4388 | AT_WORD_BOUNDARY, so this code is disabled. Expanding the | |
b18215fc RS |
4389 | macro and introducing temporary variables works around the bug. */ |
4390 | ||
9121ca40 | 4391 | #if 0 |
fa9a63c5 RM |
4392 | /* Test if the character before D and the one at D differ with respect |
4393 | to being word-constituent. */ | |
4394 | #define AT_WORD_BOUNDARY(d) \ | |
4395 | (AT_STRINGS_BEG (d) || AT_STRINGS_END (d) \ | |
4396 | || WORDCHAR_P (d - 1) != WORDCHAR_P (d)) | |
9121ca40 | 4397 | #endif |
fa9a63c5 RM |
4398 | |
4399 | /* Free everything we malloc. */ | |
4400 | #ifdef MATCH_MAY_ALLOCATE | |
0b32bf0e SM |
4401 | # define FREE_VAR(var) if (var) { REGEX_FREE (var); var = NULL; } else |
4402 | # define FREE_VARIABLES() \ | |
fa9a63c5 RM |
4403 | do { \ |
4404 | REGEX_FREE_STACK (fail_stack.stack); \ | |
4405 | FREE_VAR (regstart); \ | |
4406 | FREE_VAR (regend); \ | |
fa9a63c5 RM |
4407 | FREE_VAR (best_regstart); \ |
4408 | FREE_VAR (best_regend); \ | |
fa9a63c5 RM |
4409 | } while (0) |
4410 | #else | |
0b32bf0e | 4411 | # define FREE_VARIABLES() ((void)0) /* Do nothing! But inhibit gcc warning. */ |
fa9a63c5 RM |
4412 | #endif /* not MATCH_MAY_ALLOCATE */ |
4413 | ||
505bde11 SM |
4414 | \f |
4415 | /* Optimization routines. */ | |
4416 | ||
4e8a9132 SM |
4417 | /* If the operation is a match against one or more chars, |
4418 | return a pointer to the next operation, else return NULL. */ | |
01618498 | 4419 | static re_char * |
4e8a9132 | 4420 | skip_one_char (p) |
01618498 | 4421 | re_char *p; |
4e8a9132 SM |
4422 | { |
4423 | switch (SWITCH_ENUM_CAST (*p++)) | |
4424 | { | |
4425 | case anychar: | |
4426 | break; | |
177c0ea7 | 4427 | |
4e8a9132 SM |
4428 | case exactn: |
4429 | p += *p + 1; | |
4430 | break; | |
4431 | ||
4432 | case charset_not: | |
4433 | case charset: | |
4434 | if (CHARSET_RANGE_TABLE_EXISTS_P (p - 1)) | |
4435 | { | |
4436 | int mcnt; | |
4437 | p = CHARSET_RANGE_TABLE (p - 1); | |
4438 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
4439 | p = CHARSET_RANGE_TABLE_END (p, mcnt); | |
4440 | } | |
4441 | else | |
4442 | p += 1 + CHARSET_BITMAP_SIZE (p - 1); | |
4443 | break; | |
177c0ea7 | 4444 | |
4e8a9132 SM |
4445 | case syntaxspec: |
4446 | case notsyntaxspec: | |
1fb352e0 | 4447 | #ifdef emacs |
4e8a9132 SM |
4448 | case categoryspec: |
4449 | case notcategoryspec: | |
4450 | #endif /* emacs */ | |
4451 | p++; | |
4452 | break; | |
4453 | ||
4454 | default: | |
4455 | p = NULL; | |
4456 | } | |
4457 | return p; | |
4458 | } | |
4459 | ||
4460 | ||
505bde11 SM |
4461 | /* Jump over non-matching operations. */ |
4462 | static unsigned char * | |
4e8a9132 | 4463 | skip_noops (p, pend) |
505bde11 | 4464 | unsigned char *p, *pend; |
505bde11 SM |
4465 | { |
4466 | int mcnt; | |
4467 | while (p < pend) | |
4468 | { | |
4469 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p)) | |
4470 | { | |
4471 | case start_memory: | |
505bde11 SM |
4472 | case stop_memory: |
4473 | p += 2; break; | |
4474 | case no_op: | |
4475 | p += 1; break; | |
4476 | case jump: | |
4477 | p += 1; | |
4478 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
4479 | p += mcnt; | |
4480 | break; | |
4481 | default: | |
4482 | return p; | |
4483 | } | |
4484 | } | |
4485 | assert (p == pend); | |
4486 | return p; | |
4487 | } | |
4488 | ||
4489 | /* Non-zero if "p1 matches something" implies "p2 fails". */ | |
4490 | static int | |
4491 | mutually_exclusive_p (bufp, p1, p2) | |
4492 | struct re_pattern_buffer *bufp; | |
4493 | unsigned char *p1, *p2; | |
4494 | { | |
4e8a9132 | 4495 | re_opcode_t op2; |
2d1675e4 | 4496 | const boolean multibyte = RE_MULTIBYTE_P (bufp); |
505bde11 SM |
4497 | unsigned char *pend = bufp->buffer + bufp->used; |
4498 | ||
4e8a9132 | 4499 | assert (p1 >= bufp->buffer && p1 < pend |
505bde11 SM |
4500 | && p2 >= bufp->buffer && p2 <= pend); |
4501 | ||
4502 | /* Skip over open/close-group commands. | |
4503 | If what follows this loop is a ...+ construct, | |
4504 | look at what begins its body, since we will have to | |
4505 | match at least one of that. */ | |
4e8a9132 SM |
4506 | p2 = skip_noops (p2, pend); |
4507 | /* The same skip can be done for p1, except that this function | |
4508 | is only used in the case where p1 is a simple match operator. */ | |
4509 | /* p1 = skip_noops (p1, pend); */ | |
4510 | ||
4511 | assert (p1 >= bufp->buffer && p1 < pend | |
4512 | && p2 >= bufp->buffer && p2 <= pend); | |
4513 | ||
4514 | op2 = p2 == pend ? succeed : *p2; | |
4515 | ||
4516 | switch (SWITCH_ENUM_CAST (op2)) | |
505bde11 | 4517 | { |
4e8a9132 SM |
4518 | case succeed: |
4519 | case endbuf: | |
4520 | /* If we're at the end of the pattern, we can change. */ | |
4521 | if (skip_one_char (p1)) | |
505bde11 | 4522 | { |
505bde11 SM |
4523 | DEBUG_PRINT1 (" End of pattern: fast loop.\n"); |
4524 | return 1; | |
505bde11 | 4525 | } |
4e8a9132 | 4526 | break; |
177c0ea7 | 4527 | |
4e8a9132 | 4528 | case endline: |
4e8a9132 SM |
4529 | case exactn: |
4530 | { | |
01618498 | 4531 | register re_wchar_t c |
4e8a9132 | 4532 | = (re_opcode_t) *p2 == endline ? '\n' |
411e4203 | 4533 | : RE_STRING_CHAR (p2 + 2, pend - p2 - 2); |
505bde11 | 4534 | |
4e8a9132 SM |
4535 | if ((re_opcode_t) *p1 == exactn) |
4536 | { | |
4537 | if (c != RE_STRING_CHAR (p1 + 2, pend - p1 - 2)) | |
4538 | { | |
4539 | DEBUG_PRINT3 (" '%c' != '%c' => fast loop.\n", c, p1[2]); | |
4540 | return 1; | |
4541 | } | |
4542 | } | |
505bde11 | 4543 | |
4e8a9132 SM |
4544 | else if ((re_opcode_t) *p1 == charset |
4545 | || (re_opcode_t) *p1 == charset_not) | |
4546 | { | |
4547 | int not = (re_opcode_t) *p1 == charset_not; | |
505bde11 | 4548 | |
4e8a9132 SM |
4549 | /* Test if C is listed in charset (or charset_not) |
4550 | at `p1'. */ | |
4551 | if (SINGLE_BYTE_CHAR_P (c)) | |
4552 | { | |
4553 | if (c < CHARSET_BITMAP_SIZE (p1) * BYTEWIDTH | |
4554 | && p1[2 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH))) | |
4555 | not = !not; | |
4556 | } | |
4557 | else if (CHARSET_RANGE_TABLE_EXISTS_P (p1)) | |
4558 | CHARSET_LOOKUP_RANGE_TABLE (not, c, p1); | |
505bde11 | 4559 | |
4e8a9132 SM |
4560 | /* `not' is equal to 1 if c would match, which means |
4561 | that we can't change to pop_failure_jump. */ | |
4562 | if (!not) | |
4563 | { | |
4564 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4565 | return 1; | |
4566 | } | |
4567 | } | |
4568 | else if ((re_opcode_t) *p1 == anychar | |
4569 | && c == '\n') | |
4570 | { | |
4571 | DEBUG_PRINT1 (" . != \\n => fast loop.\n"); | |
4572 | return 1; | |
4573 | } | |
4574 | } | |
4575 | break; | |
505bde11 | 4576 | |
4e8a9132 | 4577 | case charset: |
4e8a9132 SM |
4578 | { |
4579 | if ((re_opcode_t) *p1 == exactn) | |
4580 | /* Reuse the code above. */ | |
4581 | return mutually_exclusive_p (bufp, p2, p1); | |
505bde11 | 4582 | |
505bde11 SM |
4583 | /* It is hard to list up all the character in charset |
4584 | P2 if it includes multibyte character. Give up in | |
4585 | such case. */ | |
4586 | else if (!multibyte || !CHARSET_RANGE_TABLE_EXISTS_P (p2)) | |
4587 | { | |
4588 | /* Now, we are sure that P2 has no range table. | |
4589 | So, for the size of bitmap in P2, `p2[1]' is | |
4590 | enough. But P1 may have range table, so the | |
4591 | size of bitmap table of P1 is extracted by | |
4592 | using macro `CHARSET_BITMAP_SIZE'. | |
4593 | ||
4594 | Since we know that all the character listed in | |
4595 | P2 is ASCII, it is enough to test only bitmap | |
4596 | table of P1. */ | |
4597 | ||
411e4203 | 4598 | if ((re_opcode_t) *p1 == charset) |
505bde11 SM |
4599 | { |
4600 | int idx; | |
4601 | /* We win if the charset inside the loop | |
4602 | has no overlap with the one after the loop. */ | |
4603 | for (idx = 0; | |
4604 | (idx < (int) p2[1] | |
4605 | && idx < CHARSET_BITMAP_SIZE (p1)); | |
4606 | idx++) | |
4607 | if ((p2[2 + idx] & p1[2 + idx]) != 0) | |
4608 | break; | |
4609 | ||
4610 | if (idx == p2[1] | |
4611 | || idx == CHARSET_BITMAP_SIZE (p1)) | |
4612 | { | |
4613 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4614 | return 1; | |
4615 | } | |
4616 | } | |
411e4203 | 4617 | else if ((re_opcode_t) *p1 == charset_not) |
505bde11 SM |
4618 | { |
4619 | int idx; | |
4620 | /* We win if the charset_not inside the loop lists | |
4621 | every character listed in the charset after. */ | |
4622 | for (idx = 0; idx < (int) p2[1]; idx++) | |
4623 | if (! (p2[2 + idx] == 0 | |
4624 | || (idx < CHARSET_BITMAP_SIZE (p1) | |
4625 | && ((p2[2 + idx] & ~ p1[2 + idx]) == 0)))) | |
4626 | break; | |
4627 | ||
4e8a9132 SM |
4628 | if (idx == p2[1]) |
4629 | { | |
4630 | DEBUG_PRINT1 (" No match => fast loop.\n"); | |
4631 | return 1; | |
4632 | } | |
4633 | } | |
4634 | } | |
4635 | } | |
609b757a | 4636 | break; |
177c0ea7 | 4637 | |
411e4203 SM |
4638 | case charset_not: |
4639 | switch (SWITCH_ENUM_CAST (*p1)) | |
4640 | { | |
4641 | case exactn: | |
4642 | case charset: | |
4643 | /* Reuse the code above. */ | |
4644 | return mutually_exclusive_p (bufp, p2, p1); | |
4645 | case charset_not: | |
4646 | /* When we have two charset_not, it's very unlikely that | |
4647 | they don't overlap. The union of the two sets of excluded | |
4648 | chars should cover all possible chars, which, as a matter of | |
4649 | fact, is virtually impossible in multibyte buffers. */ | |
36595814 | 4650 | break; |
411e4203 SM |
4651 | } |
4652 | break; | |
4653 | ||
4e8a9132 SM |
4654 | case wordend: |
4655 | case notsyntaxspec: | |
4656 | return ((re_opcode_t) *p1 == syntaxspec | |
4657 | && p1[1] == (op2 == wordend ? Sword : p2[1])); | |
4658 | ||
4659 | case wordbeg: | |
4660 | case syntaxspec: | |
4661 | return ((re_opcode_t) *p1 == notsyntaxspec | |
4662 | && p1[1] == (op2 == wordend ? Sword : p2[1])); | |
4663 | ||
4664 | case wordbound: | |
4665 | return (((re_opcode_t) *p1 == notsyntaxspec | |
4666 | || (re_opcode_t) *p1 == syntaxspec) | |
4667 | && p1[1] == Sword); | |
4668 | ||
1fb352e0 | 4669 | #ifdef emacs |
4e8a9132 SM |
4670 | case categoryspec: |
4671 | return ((re_opcode_t) *p1 == notcategoryspec && p1[1] == p2[1]); | |
4672 | case notcategoryspec: | |
4673 | return ((re_opcode_t) *p1 == categoryspec && p1[1] == p2[1]); | |
4674 | #endif /* emacs */ | |
4675 | ||
4676 | default: | |
4677 | ; | |
505bde11 SM |
4678 | } |
4679 | ||
4680 | /* Safe default. */ | |
4681 | return 0; | |
4682 | } | |
4683 | ||
fa9a63c5 RM |
4684 | \f |
4685 | /* Matching routines. */ | |
4686 | ||
25fe55af | 4687 | #ifndef emacs /* Emacs never uses this. */ |
fa9a63c5 RM |
4688 | /* re_match is like re_match_2 except it takes only a single string. */ |
4689 | ||
4690 | int | |
4691 | re_match (bufp, string, size, pos, regs) | |
4692 | struct re_pattern_buffer *bufp; | |
4693 | const char *string; | |
4694 | int size, pos; | |
4695 | struct re_registers *regs; | |
4696 | { | |
4bb91c68 | 4697 | int result = re_match_2_internal (bufp, NULL, 0, (re_char*) string, size, |
fa9a63c5 | 4698 | pos, regs, size); |
0b32bf0e | 4699 | # if defined C_ALLOCA && !defined REGEX_MALLOC |
fa9a63c5 | 4700 | alloca (0); |
0b32bf0e | 4701 | # endif |
fa9a63c5 RM |
4702 | return result; |
4703 | } | |
c0f9ea08 | 4704 | WEAK_ALIAS (__re_match, re_match) |
fa9a63c5 RM |
4705 | #endif /* not emacs */ |
4706 | ||
b18215fc RS |
4707 | #ifdef emacs |
4708 | /* In Emacs, this is the string or buffer in which we | |
25fe55af | 4709 | are matching. It is used for looking up syntax properties. */ |
b18215fc RS |
4710 | Lisp_Object re_match_object; |
4711 | #endif | |
fa9a63c5 RM |
4712 | |
4713 | /* re_match_2 matches the compiled pattern in BUFP against the | |
4714 | the (virtual) concatenation of STRING1 and STRING2 (of length SIZE1 | |
4715 | and SIZE2, respectively). We start matching at POS, and stop | |
4716 | matching at STOP. | |
5e69f11e | 4717 | |
fa9a63c5 | 4718 | If REGS is non-null and the `no_sub' field of BUFP is nonzero, we |
25fe55af | 4719 | store offsets for the substring each group matched in REGS. See the |
fa9a63c5 RM |
4720 | documentation for exactly how many groups we fill. |
4721 | ||
4722 | We return -1 if no match, -2 if an internal error (such as the | |
25fe55af | 4723 | failure stack overflowing). Otherwise, we return the length of the |
fa9a63c5 RM |
4724 | matched substring. */ |
4725 | ||
4726 | int | |
4727 | re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop) | |
4728 | struct re_pattern_buffer *bufp; | |
4729 | const char *string1, *string2; | |
4730 | int size1, size2; | |
4731 | int pos; | |
4732 | struct re_registers *regs; | |
4733 | int stop; | |
4734 | { | |
b18215fc | 4735 | int result; |
25fe55af | 4736 | |
b18215fc | 4737 | #ifdef emacs |
cc9b4df2 KH |
4738 | int charpos; |
4739 | gl_state.object = re_match_object; | |
99633e97 | 4740 | charpos = SYNTAX_TABLE_BYTE_TO_CHAR (POS_AS_IN_BUFFER (pos)); |
cc9b4df2 | 4741 | SETUP_SYNTAX_TABLE_FOR_OBJECT (re_match_object, charpos, 1); |
b18215fc RS |
4742 | #endif |
4743 | ||
4bb91c68 SM |
4744 | result = re_match_2_internal (bufp, (re_char*) string1, size1, |
4745 | (re_char*) string2, size2, | |
cc9b4df2 | 4746 | pos, regs, stop); |
0b32bf0e | 4747 | #if defined C_ALLOCA && !defined REGEX_MALLOC |
fa9a63c5 | 4748 | alloca (0); |
a60198e5 | 4749 | #endif |
fa9a63c5 RM |
4750 | return result; |
4751 | } | |
c0f9ea08 | 4752 | WEAK_ALIAS (__re_match_2, re_match_2) |
fa9a63c5 RM |
4753 | |
4754 | /* This is a separate function so that we can force an alloca cleanup | |
25fe55af | 4755 | afterwards. */ |
fa9a63c5 RM |
4756 | static int |
4757 | re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop) | |
4758 | struct re_pattern_buffer *bufp; | |
66f0296e | 4759 | re_char *string1, *string2; |
fa9a63c5 RM |
4760 | int size1, size2; |
4761 | int pos; | |
4762 | struct re_registers *regs; | |
4763 | int stop; | |
4764 | { | |
4765 | /* General temporaries. */ | |
4766 | int mcnt; | |
01618498 | 4767 | size_t reg; |
66f0296e | 4768 | boolean not; |
fa9a63c5 RM |
4769 | |
4770 | /* Just past the end of the corresponding string. */ | |
66f0296e | 4771 | re_char *end1, *end2; |
fa9a63c5 RM |
4772 | |
4773 | /* Pointers into string1 and string2, just past the last characters in | |
25fe55af | 4774 | each to consider matching. */ |
66f0296e | 4775 | re_char *end_match_1, *end_match_2; |
fa9a63c5 RM |
4776 | |
4777 | /* Where we are in the data, and the end of the current string. */ | |
66f0296e | 4778 | re_char *d, *dend; |
5e69f11e | 4779 | |
99633e97 SM |
4780 | /* Used sometimes to remember where we were before starting matching |
4781 | an operator so that we can go back in case of failure. This "atomic" | |
4782 | behavior of matching opcodes is indispensable to the correctness | |
4783 | of the on_failure_keep_string_jump optimization. */ | |
4784 | re_char *dfail; | |
4785 | ||
fa9a63c5 | 4786 | /* Where we are in the pattern, and the end of the pattern. */ |
01618498 SM |
4787 | re_char *p = bufp->buffer; |
4788 | re_char *pend = p + bufp->used; | |
fa9a63c5 | 4789 | |
25fe55af | 4790 | /* We use this to map every character in the string. */ |
6676cb1c | 4791 | RE_TRANSLATE_TYPE translate = bufp->translate; |
fa9a63c5 | 4792 | |
25fe55af | 4793 | /* Nonzero if we have to concern multibyte character. */ |
2d1675e4 | 4794 | const boolean multibyte = RE_MULTIBYTE_P (bufp); |
b18215fc | 4795 | |
fa9a63c5 RM |
4796 | /* Failure point stack. Each place that can handle a failure further |
4797 | down the line pushes a failure point on this stack. It consists of | |
505bde11 | 4798 | regstart, and regend for all registers corresponding to |
fa9a63c5 RM |
4799 | the subexpressions we're currently inside, plus the number of such |
4800 | registers, and, finally, two char *'s. The first char * is where | |
4801 | to resume scanning the pattern; the second one is where to resume | |
505bde11 | 4802 | scanning the strings. */ |
25fe55af | 4803 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global. */ |
fa9a63c5 RM |
4804 | fail_stack_type fail_stack; |
4805 | #endif | |
4806 | #ifdef DEBUG | |
fa9a63c5 RM |
4807 | unsigned nfailure_points_pushed = 0, nfailure_points_popped = 0; |
4808 | #endif | |
4809 | ||
0b32bf0e | 4810 | #if defined REL_ALLOC && defined REGEX_MALLOC |
fa9a63c5 RM |
4811 | /* This holds the pointer to the failure stack, when |
4812 | it is allocated relocatably. */ | |
4813 | fail_stack_elt_t *failure_stack_ptr; | |
99633e97 | 4814 | #endif |
fa9a63c5 RM |
4815 | |
4816 | /* We fill all the registers internally, independent of what we | |
25fe55af | 4817 | return, for use in backreferences. The number here includes |
fa9a63c5 | 4818 | an element for register zero. */ |
4bb91c68 | 4819 | size_t num_regs = bufp->re_nsub + 1; |
5e69f11e | 4820 | |
fa9a63c5 RM |
4821 | /* Information on the contents of registers. These are pointers into |
4822 | the input strings; they record just what was matched (on this | |
4823 | attempt) by a subexpression part of the pattern, that is, the | |
4824 | regnum-th regstart pointer points to where in the pattern we began | |
4825 | matching and the regnum-th regend points to right after where we | |
4826 | stopped matching the regnum-th subexpression. (The zeroth register | |
4827 | keeps track of what the whole pattern matches.) */ | |
4828 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
66f0296e | 4829 | re_char **regstart, **regend; |
fa9a63c5 RM |
4830 | #endif |
4831 | ||
fa9a63c5 | 4832 | /* The following record the register info as found in the above |
5e69f11e | 4833 | variables when we find a match better than any we've seen before. |
fa9a63c5 RM |
4834 | This happens as we backtrack through the failure points, which in |
4835 | turn happens only if we have not yet matched the entire string. */ | |
4836 | unsigned best_regs_set = false; | |
4837 | #ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */ | |
66f0296e | 4838 | re_char **best_regstart, **best_regend; |
fa9a63c5 | 4839 | #endif |
5e69f11e | 4840 | |
fa9a63c5 RM |
4841 | /* Logically, this is `best_regend[0]'. But we don't want to have to |
4842 | allocate space for that if we're not allocating space for anything | |
25fe55af | 4843 | else (see below). Also, we never need info about register 0 for |
fa9a63c5 RM |
4844 | any of the other register vectors, and it seems rather a kludge to |
4845 | treat `best_regend' differently than the rest. So we keep track of | |
4846 | the end of the best match so far in a separate variable. We | |
4847 | initialize this to NULL so that when we backtrack the first time | |
4848 | and need to test it, it's not garbage. */ | |
66f0296e | 4849 | re_char *match_end = NULL; |
fa9a63c5 | 4850 | |
fa9a63c5 RM |
4851 | #ifdef DEBUG |
4852 | /* Counts the total number of registers pushed. */ | |
5e69f11e | 4853 | unsigned num_regs_pushed = 0; |
fa9a63c5 RM |
4854 | #endif |
4855 | ||
4856 | DEBUG_PRINT1 ("\n\nEntering re_match_2.\n"); | |
5e69f11e | 4857 | |
fa9a63c5 | 4858 | INIT_FAIL_STACK (); |
5e69f11e | 4859 | |
fa9a63c5 RM |
4860 | #ifdef MATCH_MAY_ALLOCATE |
4861 | /* Do not bother to initialize all the register variables if there are | |
4862 | no groups in the pattern, as it takes a fair amount of time. If | |
4863 | there are groups, we include space for register 0 (the whole | |
4864 | pattern), even though we never use it, since it simplifies the | |
4865 | array indexing. We should fix this. */ | |
4866 | if (bufp->re_nsub) | |
4867 | { | |
66f0296e SM |
4868 | regstart = REGEX_TALLOC (num_regs, re_char *); |
4869 | regend = REGEX_TALLOC (num_regs, re_char *); | |
4870 | best_regstart = REGEX_TALLOC (num_regs, re_char *); | |
4871 | best_regend = REGEX_TALLOC (num_regs, re_char *); | |
fa9a63c5 | 4872 | |
505bde11 | 4873 | if (!(regstart && regend && best_regstart && best_regend)) |
25fe55af RS |
4874 | { |
4875 | FREE_VARIABLES (); | |
4876 | return -2; | |
4877 | } | |
fa9a63c5 RM |
4878 | } |
4879 | else | |
4880 | { | |
4881 | /* We must initialize all our variables to NULL, so that | |
25fe55af | 4882 | `FREE_VARIABLES' doesn't try to free them. */ |
505bde11 | 4883 | regstart = regend = best_regstart = best_regend = NULL; |
fa9a63c5 RM |
4884 | } |
4885 | #endif /* MATCH_MAY_ALLOCATE */ | |
4886 | ||
4887 | /* The starting position is bogus. */ | |
4888 | if (pos < 0 || pos > size1 + size2) | |
4889 | { | |
4890 | FREE_VARIABLES (); | |
4891 | return -1; | |
4892 | } | |
5e69f11e | 4893 | |
fa9a63c5 RM |
4894 | /* Initialize subexpression text positions to -1 to mark ones that no |
4895 | start_memory/stop_memory has been seen for. Also initialize the | |
4896 | register information struct. */ | |
01618498 SM |
4897 | for (reg = 1; reg < num_regs; reg++) |
4898 | regstart[reg] = regend[reg] = NULL; | |
99633e97 | 4899 | |
fa9a63c5 | 4900 | /* We move `string1' into `string2' if the latter's empty -- but not if |
25fe55af | 4901 | `string1' is null. */ |
fa9a63c5 RM |
4902 | if (size2 == 0 && string1 != NULL) |
4903 | { | |
4904 | string2 = string1; | |
4905 | size2 = size1; | |
4906 | string1 = 0; | |
4907 | size1 = 0; | |
4908 | } | |
4909 | end1 = string1 + size1; | |
4910 | end2 = string2 + size2; | |
4911 | ||
5e69f11e | 4912 | /* `p' scans through the pattern as `d' scans through the data. |
fa9a63c5 RM |
4913 | `dend' is the end of the input string that `d' points within. `d' |
4914 | is advanced into the following input string whenever necessary, but | |
4915 | this happens before fetching; therefore, at the beginning of the | |
4916 | loop, `d' can be pointing at the end of a string, but it cannot | |
4917 | equal `string2'. */ | |
419d1c74 | 4918 | if (pos >= size1) |
fa9a63c5 | 4919 | { |
419d1c74 SM |
4920 | /* Only match within string2. */ |
4921 | d = string2 + pos - size1; | |
4922 | dend = end_match_2 = string2 + stop - size1; | |
4923 | end_match_1 = end1; /* Just to give it a value. */ | |
fa9a63c5 RM |
4924 | } |
4925 | else | |
4926 | { | |
f1ad044f | 4927 | if (stop < size1) |
419d1c74 SM |
4928 | { |
4929 | /* Only match within string1. */ | |
4930 | end_match_1 = string1 + stop; | |
4931 | /* BEWARE! | |
4932 | When we reach end_match_1, PREFETCH normally switches to string2. | |
4933 | But in the present case, this means that just doing a PREFETCH | |
4934 | makes us jump from `stop' to `gap' within the string. | |
4935 | What we really want here is for the search to stop as | |
4936 | soon as we hit end_match_1. That's why we set end_match_2 | |
4937 | to end_match_1 (since PREFETCH fails as soon as we hit | |
4938 | end_match_2). */ | |
4939 | end_match_2 = end_match_1; | |
4940 | } | |
4941 | else | |
f1ad044f SM |
4942 | { /* It's important to use this code when stop == size so that |
4943 | moving `d' from end1 to string2 will not prevent the d == dend | |
4944 | check from catching the end of string. */ | |
419d1c74 SM |
4945 | end_match_1 = end1; |
4946 | end_match_2 = string2 + stop - size1; | |
4947 | } | |
4948 | d = string1 + pos; | |
4949 | dend = end_match_1; | |
fa9a63c5 RM |
4950 | } |
4951 | ||
4952 | DEBUG_PRINT1 ("The compiled pattern is: "); | |
4953 | DEBUG_PRINT_COMPILED_PATTERN (bufp, p, pend); | |
4954 | DEBUG_PRINT1 ("The string to match is: `"); | |
4955 | DEBUG_PRINT_DOUBLE_STRING (d, string1, size1, string2, size2); | |
4956 | DEBUG_PRINT1 ("'\n"); | |
5e69f11e | 4957 | |
25fe55af | 4958 | /* This loops over pattern commands. It exits by returning from the |
fa9a63c5 RM |
4959 | function if the match is complete, or it drops through if the match |
4960 | fails at this starting point in the input data. */ | |
4961 | for (;;) | |
4962 | { | |
505bde11 | 4963 | DEBUG_PRINT2 ("\n%p: ", p); |
fa9a63c5 RM |
4964 | |
4965 | if (p == pend) | |
4966 | { /* End of pattern means we might have succeeded. */ | |
25fe55af | 4967 | DEBUG_PRINT1 ("end of pattern ... "); |
5e69f11e | 4968 | |
fa9a63c5 | 4969 | /* If we haven't matched the entire string, and we want the |
25fe55af RS |
4970 | longest match, try backtracking. */ |
4971 | if (d != end_match_2) | |
fa9a63c5 RM |
4972 | { |
4973 | /* 1 if this match ends in the same string (string1 or string2) | |
4974 | as the best previous match. */ | |
5e69f11e | 4975 | boolean same_str_p = (FIRST_STRING_P (match_end) |
99633e97 | 4976 | == FIRST_STRING_P (d)); |
fa9a63c5 RM |
4977 | /* 1 if this match is the best seen so far. */ |
4978 | boolean best_match_p; | |
4979 | ||
4980 | /* AIX compiler got confused when this was combined | |
25fe55af | 4981 | with the previous declaration. */ |
fa9a63c5 RM |
4982 | if (same_str_p) |
4983 | best_match_p = d > match_end; | |
4984 | else | |
99633e97 | 4985 | best_match_p = !FIRST_STRING_P (d); |
fa9a63c5 | 4986 | |
25fe55af RS |
4987 | DEBUG_PRINT1 ("backtracking.\n"); |
4988 | ||
4989 | if (!FAIL_STACK_EMPTY ()) | |
4990 | { /* More failure points to try. */ | |
4991 | ||
4992 | /* If exceeds best match so far, save it. */ | |
4993 | if (!best_regs_set || best_match_p) | |
4994 | { | |
4995 | best_regs_set = true; | |
4996 | match_end = d; | |
4997 | ||
4998 | DEBUG_PRINT1 ("\nSAVING match as best so far.\n"); | |
4999 | ||
01618498 | 5000 | for (reg = 1; reg < num_regs; reg++) |
25fe55af | 5001 | { |
01618498 SM |
5002 | best_regstart[reg] = regstart[reg]; |
5003 | best_regend[reg] = regend[reg]; | |
25fe55af RS |
5004 | } |
5005 | } | |
5006 | goto fail; | |
5007 | } | |
5008 | ||
5009 | /* If no failure points, don't restore garbage. And if | |
5010 | last match is real best match, don't restore second | |
5011 | best one. */ | |
5012 | else if (best_regs_set && !best_match_p) | |
5013 | { | |
5014 | restore_best_regs: | |
5015 | /* Restore best match. It may happen that `dend == | |
5016 | end_match_1' while the restored d is in string2. | |
5017 | For example, the pattern `x.*y.*z' against the | |
5018 | strings `x-' and `y-z-', if the two strings are | |
5019 | not consecutive in memory. */ | |
5020 | DEBUG_PRINT1 ("Restoring best registers.\n"); | |
5021 | ||
5022 | d = match_end; | |
5023 | dend = ((d >= string1 && d <= end1) | |
5024 | ? end_match_1 : end_match_2); | |
fa9a63c5 | 5025 | |
01618498 | 5026 | for (reg = 1; reg < num_regs; reg++) |
fa9a63c5 | 5027 | { |
01618498 SM |
5028 | regstart[reg] = best_regstart[reg]; |
5029 | regend[reg] = best_regend[reg]; | |
fa9a63c5 | 5030 | } |
25fe55af RS |
5031 | } |
5032 | } /* d != end_match_2 */ | |
fa9a63c5 RM |
5033 | |
5034 | succeed_label: | |
25fe55af | 5035 | DEBUG_PRINT1 ("Accepting match.\n"); |
fa9a63c5 | 5036 | |
25fe55af RS |
5037 | /* If caller wants register contents data back, do it. */ |
5038 | if (regs && !bufp->no_sub) | |
fa9a63c5 | 5039 | { |
25fe55af RS |
5040 | /* Have the register data arrays been allocated? */ |
5041 | if (bufp->regs_allocated == REGS_UNALLOCATED) | |
5042 | { /* No. So allocate them with malloc. We need one | |
5043 | extra element beyond `num_regs' for the `-1' marker | |
5044 | GNU code uses. */ | |
5045 | regs->num_regs = MAX (RE_NREGS, num_regs + 1); | |
5046 | regs->start = TALLOC (regs->num_regs, regoff_t); | |
5047 | regs->end = TALLOC (regs->num_regs, regoff_t); | |
5048 | if (regs->start == NULL || regs->end == NULL) | |
fa9a63c5 RM |
5049 | { |
5050 | FREE_VARIABLES (); | |
5051 | return -2; | |
5052 | } | |
25fe55af RS |
5053 | bufp->regs_allocated = REGS_REALLOCATE; |
5054 | } | |
5055 | else if (bufp->regs_allocated == REGS_REALLOCATE) | |
5056 | { /* Yes. If we need more elements than were already | |
5057 | allocated, reallocate them. If we need fewer, just | |
5058 | leave it alone. */ | |
5059 | if (regs->num_regs < num_regs + 1) | |
5060 | { | |
5061 | regs->num_regs = num_regs + 1; | |
5062 | RETALLOC (regs->start, regs->num_regs, regoff_t); | |
5063 | RETALLOC (regs->end, regs->num_regs, regoff_t); | |
5064 | if (regs->start == NULL || regs->end == NULL) | |
fa9a63c5 RM |
5065 | { |
5066 | FREE_VARIABLES (); | |
5067 | return -2; | |
5068 | } | |
25fe55af RS |
5069 | } |
5070 | } | |
5071 | else | |
fa9a63c5 RM |
5072 | { |
5073 | /* These braces fend off a "empty body in an else-statement" | |
25fe55af | 5074 | warning under GCC when assert expands to nothing. */ |
fa9a63c5 RM |
5075 | assert (bufp->regs_allocated == REGS_FIXED); |
5076 | } | |
5077 | ||
25fe55af RS |
5078 | /* Convert the pointer data in `regstart' and `regend' to |
5079 | indices. Register zero has to be set differently, | |
5080 | since we haven't kept track of any info for it. */ | |
5081 | if (regs->num_regs > 0) | |
5082 | { | |
5083 | regs->start[0] = pos; | |
99633e97 | 5084 | regs->end[0] = POINTER_TO_OFFSET (d); |
25fe55af | 5085 | } |
5e69f11e | 5086 | |
25fe55af RS |
5087 | /* Go through the first `min (num_regs, regs->num_regs)' |
5088 | registers, since that is all we initialized. */ | |
01618498 | 5089 | for (reg = 1; reg < MIN (num_regs, regs->num_regs); reg++) |
fa9a63c5 | 5090 | { |
01618498 SM |
5091 | if (REG_UNSET (regstart[reg]) || REG_UNSET (regend[reg])) |
5092 | regs->start[reg] = regs->end[reg] = -1; | |
25fe55af RS |
5093 | else |
5094 | { | |
01618498 SM |
5095 | regs->start[reg] |
5096 | = (regoff_t) POINTER_TO_OFFSET (regstart[reg]); | |
5097 | regs->end[reg] | |
5098 | = (regoff_t) POINTER_TO_OFFSET (regend[reg]); | |
25fe55af | 5099 | } |
fa9a63c5 | 5100 | } |
5e69f11e | 5101 | |
25fe55af RS |
5102 | /* If the regs structure we return has more elements than |
5103 | were in the pattern, set the extra elements to -1. If | |
5104 | we (re)allocated the registers, this is the case, | |
5105 | because we always allocate enough to have at least one | |
5106 | -1 at the end. */ | |
01618498 SM |
5107 | for (reg = num_regs; reg < regs->num_regs; reg++) |
5108 | regs->start[reg] = regs->end[reg] = -1; | |
fa9a63c5 RM |
5109 | } /* regs && !bufp->no_sub */ |
5110 | ||
25fe55af RS |
5111 | DEBUG_PRINT4 ("%u failure points pushed, %u popped (%u remain).\n", |
5112 | nfailure_points_pushed, nfailure_points_popped, | |
5113 | nfailure_points_pushed - nfailure_points_popped); | |
5114 | DEBUG_PRINT2 ("%u registers pushed.\n", num_regs_pushed); | |
fa9a63c5 | 5115 | |
99633e97 | 5116 | mcnt = POINTER_TO_OFFSET (d) - pos; |
fa9a63c5 | 5117 | |
25fe55af | 5118 | DEBUG_PRINT2 ("Returning %d from re_match_2.\n", mcnt); |
fa9a63c5 | 5119 | |
25fe55af RS |
5120 | FREE_VARIABLES (); |
5121 | return mcnt; | |
5122 | } | |
fa9a63c5 | 5123 | |
25fe55af | 5124 | /* Otherwise match next pattern command. */ |
fa9a63c5 RM |
5125 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++)) |
5126 | { | |
25fe55af RS |
5127 | /* Ignore these. Used to ignore the n of succeed_n's which |
5128 | currently have n == 0. */ | |
5129 | case no_op: | |
5130 | DEBUG_PRINT1 ("EXECUTING no_op.\n"); | |
5131 | break; | |
fa9a63c5 RM |
5132 | |
5133 | case succeed: | |
25fe55af | 5134 | DEBUG_PRINT1 ("EXECUTING succeed.\n"); |
fa9a63c5 RM |
5135 | goto succeed_label; |
5136 | ||
25fe55af RS |
5137 | /* Match the next n pattern characters exactly. The following |
5138 | byte in the pattern defines n, and the n bytes after that | |
5139 | are the characters to match. */ | |
fa9a63c5 RM |
5140 | case exactn: |
5141 | mcnt = *p++; | |
25fe55af | 5142 | DEBUG_PRINT2 ("EXECUTING exactn %d.\n", mcnt); |
fa9a63c5 | 5143 | |
99633e97 SM |
5144 | /* Remember the start point to rollback upon failure. */ |
5145 | dfail = d; | |
5146 | ||
25fe55af RS |
5147 | /* This is written out as an if-else so we don't waste time |
5148 | testing `translate' inside the loop. */ | |
28703c16 | 5149 | if (RE_TRANSLATE_P (translate)) |
fa9a63c5 | 5150 | { |
e934739e RS |
5151 | if (multibyte) |
5152 | do | |
5153 | { | |
5154 | int pat_charlen, buf_charlen; | |
e71b1971 | 5155 | unsigned int pat_ch, buf_ch; |
e934739e RS |
5156 | |
5157 | PREFETCH (); | |
5158 | pat_ch = STRING_CHAR_AND_LENGTH (p, pend - p, pat_charlen); | |
5159 | buf_ch = STRING_CHAR_AND_LENGTH (d, dend - d, buf_charlen); | |
5160 | ||
5161 | if (RE_TRANSLATE (translate, buf_ch) | |
5162 | != pat_ch) | |
99633e97 SM |
5163 | { |
5164 | d = dfail; | |
5165 | goto fail; | |
5166 | } | |
e934739e RS |
5167 | |
5168 | p += pat_charlen; | |
5169 | d += buf_charlen; | |
5170 | mcnt -= pat_charlen; | |
5171 | } | |
5172 | while (mcnt > 0); | |
5173 | else | |
e934739e RS |
5174 | do |
5175 | { | |
5176 | PREFETCH (); | |
66f0296e | 5177 | if (RE_TRANSLATE (translate, *d) != *p++) |
99633e97 SM |
5178 | { |
5179 | d = dfail; | |
5180 | goto fail; | |
5181 | } | |
33c46939 | 5182 | d++; |
e934739e RS |
5183 | } |
5184 | while (--mcnt); | |
fa9a63c5 RM |
5185 | } |
5186 | else | |
5187 | { | |
5188 | do | |
5189 | { | |
5190 | PREFETCH (); | |
99633e97 SM |
5191 | if (*d++ != *p++) |
5192 | { | |
5193 | d = dfail; | |
5194 | goto fail; | |
5195 | } | |
fa9a63c5 RM |
5196 | } |
5197 | while (--mcnt); | |
5198 | } | |
25fe55af | 5199 | break; |
fa9a63c5 RM |
5200 | |
5201 | ||
25fe55af | 5202 | /* Match any character except possibly a newline or a null. */ |
fa9a63c5 | 5203 | case anychar: |
e934739e RS |
5204 | { |
5205 | int buf_charlen; | |
01618498 | 5206 | re_wchar_t buf_ch; |
fa9a63c5 | 5207 | |
e934739e | 5208 | DEBUG_PRINT1 ("EXECUTING anychar.\n"); |
fa9a63c5 | 5209 | |
e934739e | 5210 | PREFETCH (); |
2d1675e4 | 5211 | buf_ch = RE_STRING_CHAR_AND_LENGTH (d, dend - d, buf_charlen); |
e934739e RS |
5212 | buf_ch = TRANSLATE (buf_ch); |
5213 | ||
5214 | if ((!(bufp->syntax & RE_DOT_NEWLINE) | |
5215 | && buf_ch == '\n') | |
5216 | || ((bufp->syntax & RE_DOT_NOT_NULL) | |
5217 | && buf_ch == '\000')) | |
5218 | goto fail; | |
5219 | ||
e934739e RS |
5220 | DEBUG_PRINT2 (" Matched `%d'.\n", *d); |
5221 | d += buf_charlen; | |
5222 | } | |
fa9a63c5 RM |
5223 | break; |
5224 | ||
5225 | ||
5226 | case charset: | |
5227 | case charset_not: | |
5228 | { | |
b18215fc | 5229 | register unsigned int c; |
fa9a63c5 | 5230 | boolean not = (re_opcode_t) *(p - 1) == charset_not; |
b18215fc RS |
5231 | int len; |
5232 | ||
5233 | /* Start of actual range_table, or end of bitmap if there is no | |
5234 | range table. */ | |
01618498 | 5235 | re_char *range_table; |
b18215fc | 5236 | |
96cc36cc | 5237 | /* Nonzero if there is a range table. */ |
b18215fc RS |
5238 | int range_table_exists; |
5239 | ||
96cc36cc RS |
5240 | /* Number of ranges of range table. This is not included |
5241 | in the initial byte-length of the command. */ | |
5242 | int count = 0; | |
fa9a63c5 | 5243 | |
25fe55af | 5244 | DEBUG_PRINT2 ("EXECUTING charset%s.\n", not ? "_not" : ""); |
fa9a63c5 | 5245 | |
b18215fc | 5246 | range_table_exists = CHARSET_RANGE_TABLE_EXISTS_P (&p[-1]); |
96cc36cc | 5247 | |
b18215fc | 5248 | if (range_table_exists) |
96cc36cc RS |
5249 | { |
5250 | range_table = CHARSET_RANGE_TABLE (&p[-1]); /* Past the bitmap. */ | |
5251 | EXTRACT_NUMBER_AND_INCR (count, range_table); | |
5252 | } | |
b18215fc | 5253 | |
2d1675e4 SM |
5254 | PREFETCH (); |
5255 | c = RE_STRING_CHAR_AND_LENGTH (d, dend - d, len); | |
5256 | c = TRANSLATE (c); /* The character to match. */ | |
b18215fc RS |
5257 | |
5258 | if (SINGLE_BYTE_CHAR_P (c)) | |
5259 | { /* Lookup bitmap. */ | |
b18215fc RS |
5260 | /* Cast to `unsigned' instead of `unsigned char' in |
5261 | case the bit list is a full 32 bytes long. */ | |
5262 | if (c < (unsigned) (CHARSET_BITMAP_SIZE (&p[-1]) * BYTEWIDTH) | |
96cc36cc RS |
5263 | && p[1 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH))) |
5264 | not = !not; | |
b18215fc | 5265 | } |
96cc36cc | 5266 | #ifdef emacs |
b18215fc | 5267 | else if (range_table_exists) |
96cc36cc RS |
5268 | { |
5269 | int class_bits = CHARSET_RANGE_TABLE_BITS (&p[-1]); | |
5270 | ||
14473664 SM |
5271 | if ( (class_bits & BIT_LOWER && ISLOWER (c)) |
5272 | | (class_bits & BIT_MULTIBYTE) | |
96cc36cc RS |
5273 | | (class_bits & BIT_PUNCT && ISPUNCT (c)) |
5274 | | (class_bits & BIT_SPACE && ISSPACE (c)) | |
5275 | | (class_bits & BIT_UPPER && ISUPPER (c)) | |
5276 | | (class_bits & BIT_WORD && ISWORD (c))) | |
5277 | not = !not; | |
5278 | else | |
5279 | CHARSET_LOOKUP_RANGE_TABLE_RAW (not, c, range_table, count); | |
5280 | } | |
5281 | #endif /* emacs */ | |
fa9a63c5 | 5282 | |
96cc36cc RS |
5283 | if (range_table_exists) |
5284 | p = CHARSET_RANGE_TABLE_END (range_table, count); | |
5285 | else | |
5286 | p += CHARSET_BITMAP_SIZE (&p[-1]) + 1; | |
fa9a63c5 RM |
5287 | |
5288 | if (!not) goto fail; | |
5e69f11e | 5289 | |
b18215fc | 5290 | d += len; |
fa9a63c5 RM |
5291 | break; |
5292 | } | |
5293 | ||
5294 | ||
25fe55af | 5295 | /* The beginning of a group is represented by start_memory. |
505bde11 | 5296 | The argument is the register number. The text |
25fe55af RS |
5297 | matched within the group is recorded (in the internal |
5298 | registers data structure) under the register number. */ | |
5299 | case start_memory: | |
505bde11 SM |
5300 | DEBUG_PRINT2 ("EXECUTING start_memory %d:\n", *p); |
5301 | ||
5302 | /* In case we need to undo this operation (via backtracking). */ | |
5303 | PUSH_FAILURE_REG ((unsigned int)*p); | |
fa9a63c5 | 5304 | |
25fe55af | 5305 | regstart[*p] = d; |
4bb91c68 | 5306 | regend[*p] = NULL; /* probably unnecessary. -sm */ |
fa9a63c5 RM |
5307 | DEBUG_PRINT2 (" regstart: %d\n", POINTER_TO_OFFSET (regstart[*p])); |
5308 | ||
25fe55af | 5309 | /* Move past the register number and inner group count. */ |
505bde11 | 5310 | p += 1; |
25fe55af | 5311 | break; |
fa9a63c5 RM |
5312 | |
5313 | ||
25fe55af | 5314 | /* The stop_memory opcode represents the end of a group. Its |
505bde11 | 5315 | argument is the same as start_memory's: the register number. */ |
fa9a63c5 | 5316 | case stop_memory: |
505bde11 SM |
5317 | DEBUG_PRINT2 ("EXECUTING stop_memory %d:\n", *p); |
5318 | ||
5319 | assert (!REG_UNSET (regstart[*p])); | |
5320 | /* Strictly speaking, there should be code such as: | |
177c0ea7 | 5321 | |
0b32bf0e | 5322 | assert (REG_UNSET (regend[*p])); |
505bde11 SM |
5323 | PUSH_FAILURE_REGSTOP ((unsigned int)*p); |
5324 | ||
5325 | But the only info to be pushed is regend[*p] and it is known to | |
5326 | be UNSET, so there really isn't anything to push. | |
5327 | Not pushing anything, on the other hand deprives us from the | |
5328 | guarantee that regend[*p] is UNSET since undoing this operation | |
5329 | will not reset its value properly. This is not important since | |
5330 | the value will only be read on the next start_memory or at | |
5331 | the very end and both events can only happen if this stop_memory | |
5332 | is *not* undone. */ | |
fa9a63c5 | 5333 | |
25fe55af | 5334 | regend[*p] = d; |
fa9a63c5 RM |
5335 | DEBUG_PRINT2 (" regend: %d\n", POINTER_TO_OFFSET (regend[*p])); |
5336 | ||
25fe55af | 5337 | /* Move past the register number and the inner group count. */ |
505bde11 | 5338 | p += 1; |
25fe55af | 5339 | break; |
fa9a63c5 RM |
5340 | |
5341 | ||
5342 | /* \<digit> has been turned into a `duplicate' command which is | |
25fe55af RS |
5343 | followed by the numeric value of <digit> as the register number. */ |
5344 | case duplicate: | |
fa9a63c5 | 5345 | { |
66f0296e | 5346 | register re_char *d2, *dend2; |
25fe55af | 5347 | int regno = *p++; /* Get which register to match against. */ |
fa9a63c5 RM |
5348 | DEBUG_PRINT2 ("EXECUTING duplicate %d.\n", regno); |
5349 | ||
25fe55af RS |
5350 | /* Can't back reference a group which we've never matched. */ |
5351 | if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno])) | |
5352 | goto fail; | |
5e69f11e | 5353 | |
25fe55af RS |
5354 | /* Where in input to try to start matching. */ |
5355 | d2 = regstart[regno]; | |
5e69f11e | 5356 | |
99633e97 SM |
5357 | /* Remember the start point to rollback upon failure. */ |
5358 | dfail = d; | |
5359 | ||
25fe55af RS |
5360 | /* Where to stop matching; if both the place to start and |
5361 | the place to stop matching are in the same string, then | |
5362 | set to the place to stop, otherwise, for now have to use | |
5363 | the end of the first string. */ | |
fa9a63c5 | 5364 | |
25fe55af | 5365 | dend2 = ((FIRST_STRING_P (regstart[regno]) |
fa9a63c5 RM |
5366 | == FIRST_STRING_P (regend[regno])) |
5367 | ? regend[regno] : end_match_1); | |
5368 | for (;;) | |
5369 | { | |
5370 | /* If necessary, advance to next segment in register | |
25fe55af | 5371 | contents. */ |
fa9a63c5 RM |
5372 | while (d2 == dend2) |
5373 | { | |
5374 | if (dend2 == end_match_2) break; | |
5375 | if (dend2 == regend[regno]) break; | |
5376 | ||
25fe55af RS |
5377 | /* End of string1 => advance to string2. */ |
5378 | d2 = string2; | |
5379 | dend2 = regend[regno]; | |
fa9a63c5 RM |
5380 | } |
5381 | /* At end of register contents => success */ | |
5382 | if (d2 == dend2) break; | |
5383 | ||
5384 | /* If necessary, advance to next segment in data. */ | |
5385 | PREFETCH (); | |
5386 | ||
5387 | /* How many characters left in this segment to match. */ | |
5388 | mcnt = dend - d; | |
5e69f11e | 5389 | |
fa9a63c5 | 5390 | /* Want how many consecutive characters we can match in |
25fe55af RS |
5391 | one shot, so, if necessary, adjust the count. */ |
5392 | if (mcnt > dend2 - d2) | |
fa9a63c5 | 5393 | mcnt = dend2 - d2; |
5e69f11e | 5394 | |
fa9a63c5 | 5395 | /* Compare that many; failure if mismatch, else move |
25fe55af | 5396 | past them. */ |
28703c16 | 5397 | if (RE_TRANSLATE_P (translate) |
2d1675e4 | 5398 | ? bcmp_translate (d, d2, mcnt, translate, multibyte) |
4bb91c68 | 5399 | : memcmp (d, d2, mcnt)) |
99633e97 SM |
5400 | { |
5401 | d = dfail; | |
5402 | goto fail; | |
5403 | } | |
fa9a63c5 | 5404 | d += mcnt, d2 += mcnt; |
fa9a63c5 RM |
5405 | } |
5406 | } | |
5407 | break; | |
5408 | ||
5409 | ||
25fe55af | 5410 | /* begline matches the empty string at the beginning of the string |
c0f9ea08 | 5411 | (unless `not_bol' is set in `bufp'), and after newlines. */ |
fa9a63c5 | 5412 | case begline: |
25fe55af | 5413 | DEBUG_PRINT1 ("EXECUTING begline.\n"); |
5e69f11e | 5414 | |
25fe55af RS |
5415 | if (AT_STRINGS_BEG (d)) |
5416 | { | |
5417 | if (!bufp->not_bol) break; | |
5418 | } | |
419d1c74 | 5419 | else |
25fe55af | 5420 | { |
419d1c74 SM |
5421 | unsigned char c; |
5422 | GET_CHAR_BEFORE_2 (c, d, string1, end1, string2, end2); | |
c0f9ea08 | 5423 | if (c == '\n') |
419d1c74 | 5424 | break; |
25fe55af RS |
5425 | } |
5426 | /* In all other cases, we fail. */ | |
5427 | goto fail; | |
fa9a63c5 RM |
5428 | |
5429 | ||
25fe55af | 5430 | /* endline is the dual of begline. */ |
fa9a63c5 | 5431 | case endline: |
25fe55af | 5432 | DEBUG_PRINT1 ("EXECUTING endline.\n"); |
fa9a63c5 | 5433 | |
25fe55af RS |
5434 | if (AT_STRINGS_END (d)) |
5435 | { | |
5436 | if (!bufp->not_eol) break; | |
5437 | } | |
f1ad044f | 5438 | else |
25fe55af | 5439 | { |
f1ad044f | 5440 | PREFETCH_NOLIMIT (); |
c0f9ea08 | 5441 | if (*d == '\n') |
f1ad044f | 5442 | break; |
25fe55af RS |
5443 | } |
5444 | goto fail; | |
fa9a63c5 RM |
5445 | |
5446 | ||
5447 | /* Match at the very beginning of the data. */ | |
25fe55af RS |
5448 | case begbuf: |
5449 | DEBUG_PRINT1 ("EXECUTING begbuf.\n"); | |
5450 | if (AT_STRINGS_BEG (d)) | |
5451 | break; | |
5452 | goto fail; | |
fa9a63c5 RM |
5453 | |
5454 | ||
5455 | /* Match at the very end of the data. */ | |
25fe55af RS |
5456 | case endbuf: |
5457 | DEBUG_PRINT1 ("EXECUTING endbuf.\n"); | |
fa9a63c5 RM |
5458 | if (AT_STRINGS_END (d)) |
5459 | break; | |
25fe55af | 5460 | goto fail; |
5e69f11e | 5461 | |
5e69f11e | 5462 | |
25fe55af RS |
5463 | /* on_failure_keep_string_jump is used to optimize `.*\n'. It |
5464 | pushes NULL as the value for the string on the stack. Then | |
505bde11 | 5465 | `POP_FAILURE_POINT' will keep the current value for the |
25fe55af RS |
5466 | string, instead of restoring it. To see why, consider |
5467 | matching `foo\nbar' against `.*\n'. The .* matches the foo; | |
5468 | then the . fails against the \n. But the next thing we want | |
5469 | to do is match the \n against the \n; if we restored the | |
5470 | string value, we would be back at the foo. | |
5471 | ||
5472 | Because this is used only in specific cases, we don't need to | |
5473 | check all the things that `on_failure_jump' does, to make | |
5474 | sure the right things get saved on the stack. Hence we don't | |
5475 | share its code. The only reason to push anything on the | |
5476 | stack at all is that otherwise we would have to change | |
5477 | `anychar's code to do something besides goto fail in this | |
5478 | case; that seems worse than this. */ | |
5479 | case on_failure_keep_string_jump: | |
505bde11 SM |
5480 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
5481 | DEBUG_PRINT3 ("EXECUTING on_failure_keep_string_jump %d (to %p):\n", | |
5482 | mcnt, p + mcnt); | |
fa9a63c5 | 5483 | |
505bde11 SM |
5484 | PUSH_FAILURE_POINT (p - 3, NULL); |
5485 | break; | |
5486 | ||
0683b6fa SM |
5487 | /* A nasty loop is introduced by the non-greedy *? and +?. |
5488 | With such loops, the stack only ever contains one failure point | |
5489 | at a time, so that a plain on_failure_jump_loop kind of | |
5490 | cycle detection cannot work. Worse yet, such a detection | |
5491 | can not only fail to detect a cycle, but it can also wrongly | |
5492 | detect a cycle (between different instantiations of the same | |
6df42991 | 5493 | loop). |
0683b6fa SM |
5494 | So the method used for those nasty loops is a little different: |
5495 | We use a special cycle-detection-stack-frame which is pushed | |
5496 | when the on_failure_jump_nastyloop failure-point is *popped*. | |
5497 | This special frame thus marks the beginning of one iteration | |
5498 | through the loop and we can hence easily check right here | |
5499 | whether something matched between the beginning and the end of | |
5500 | the loop. */ | |
5501 | case on_failure_jump_nastyloop: | |
5502 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
5503 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_nastyloop %d (to %p):\n", | |
5504 | mcnt, p + mcnt); | |
5505 | ||
5506 | assert ((re_opcode_t)p[-4] == no_op); | |
6df42991 SM |
5507 | { |
5508 | int cycle = 0; | |
5509 | CHECK_INFINITE_LOOP (p - 4, d); | |
5510 | if (!cycle) | |
5511 | /* If there's a cycle, just continue without pushing | |
5512 | this failure point. The failure point is the "try again" | |
5513 | option, which shouldn't be tried. | |
5514 | We want (x?)*?y\1z to match both xxyz and xxyxz. */ | |
5515 | PUSH_FAILURE_POINT (p - 3, d); | |
5516 | } | |
0683b6fa SM |
5517 | break; |
5518 | ||
4e8a9132 SM |
5519 | /* Simple loop detecting on_failure_jump: just check on the |
5520 | failure stack if the same spot was already hit earlier. */ | |
505bde11 SM |
5521 | case on_failure_jump_loop: |
5522 | on_failure: | |
5523 | EXTRACT_NUMBER_AND_INCR (mcnt, p); | |
5524 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_loop %d (to %p):\n", | |
5525 | mcnt, p + mcnt); | |
6df42991 SM |
5526 | { |
5527 | int cycle = 0; | |
5528 | CHECK_INFINITE_LOOP (p - 3, d); | |
5529 | if (cycle) | |
5530 | /* If there's a cycle, get out of the loop, as if the matching | |
5531 | had failed. We used to just `goto fail' here, but that was | |
5532 | aborting the search a bit too early: we want to keep the | |
5533 | empty-loop-match and keep matching after the loop. | |
5534 | We want (x?)*y\1z to match both xxyz and xxyxz. */ | |
5535 | p += mcnt; | |
5536 | else | |
5537 | PUSH_FAILURE_POINT (p - 3, d); | |
5538 | } | |
25fe55af | 5539 | break; |
fa9a63c5 RM |
5540 | |
5541 | ||
5542 | /* Uses of on_failure_jump: | |
5e69f11e | 5543 | |
25fe55af RS |
5544 | Each alternative starts with an on_failure_jump that points |
5545 | to the beginning of the next alternative. Each alternative | |
5546 | except the last ends with a jump that in effect jumps past | |
5547 | the rest of the alternatives. (They really jump to the | |
5548 | ending jump of the following alternative, because tensioning | |
5549 | these jumps is a hassle.) | |
fa9a63c5 | 5550 | |
25fe55af RS |
5551 | Repeats start with an on_failure_jump that points past both |
5552 | the repetition text and either the following jump or | |
5553 | pop_failure_jump back to this on_failure_jump. */ | |
fa9a63c5 | 5554 | case on_failure_jump: |
5b370c2b | 5555 | IMMEDIATE_QUIT_CHECK; |
25fe55af | 5556 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
505bde11 SM |
5557 | DEBUG_PRINT3 ("EXECUTING on_failure_jump %d (to %p):\n", |
5558 | mcnt, p + mcnt); | |
25fe55af | 5559 | |
505bde11 | 5560 | PUSH_FAILURE_POINT (p -3, d); |
25fe55af RS |
5561 | break; |
5562 | ||
4e8a9132 | 5563 | /* This operation is used for greedy *. |
505bde11 SM |
5564 | Compare the beginning of the repeat with what in the |
5565 | pattern follows its end. If we can establish that there | |
5566 | is nothing that they would both match, i.e., that we | |
5567 | would have to backtrack because of (as in, e.g., `a*a') | |
5568 | then we can use a non-backtracking loop based on | |
4e8a9132 | 5569 | on_failure_keep_string_jump instead of on_failure_jump. */ |
505bde11 | 5570 | case on_failure_jump_smart: |
5b370c2b | 5571 | IMMEDIATE_QUIT_CHECK; |
25fe55af | 5572 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
505bde11 SM |
5573 | DEBUG_PRINT3 ("EXECUTING on_failure_jump_smart %d (to %p).\n", |
5574 | mcnt, p + mcnt); | |
25fe55af | 5575 | { |
01618498 | 5576 | re_char *p1 = p; /* Next operation. */ |
6dcf2d0e SM |
5577 | /* Here, we discard `const', making re_match non-reentrant. */ |
5578 | unsigned char *p2 = (unsigned char*) p + mcnt; /* Jump dest. */ | |
5579 | unsigned char *p3 = (unsigned char*) p - 3; /* opcode location. */ | |
fa9a63c5 | 5580 | |
505bde11 SM |
5581 | p -= 3; /* Reset so that we will re-execute the |
5582 | instruction once it's been changed. */ | |
fa9a63c5 | 5583 | |
4e8a9132 SM |
5584 | EXTRACT_NUMBER (mcnt, p2 - 2); |
5585 | ||
5586 | /* Ensure this is a indeed the trivial kind of loop | |
5587 | we are expecting. */ | |
5588 | assert (skip_one_char (p1) == p2 - 3); | |
5589 | assert ((re_opcode_t) p2[-3] == jump && p2 + mcnt == p); | |
99633e97 | 5590 | DEBUG_STATEMENT (debug += 2); |
505bde11 | 5591 | if (mutually_exclusive_p (bufp, p1, p2)) |
fa9a63c5 | 5592 | { |
505bde11 | 5593 | /* Use a fast `on_failure_keep_string_jump' loop. */ |
4e8a9132 | 5594 | DEBUG_PRINT1 (" smart exclusive => fast loop.\n"); |
01618498 | 5595 | *p3 = (unsigned char) on_failure_keep_string_jump; |
4e8a9132 | 5596 | STORE_NUMBER (p2 - 2, mcnt + 3); |
25fe55af | 5597 | } |
505bde11 | 5598 | else |
fa9a63c5 | 5599 | { |
505bde11 SM |
5600 | /* Default to a safe `on_failure_jump' loop. */ |
5601 | DEBUG_PRINT1 (" smart default => slow loop.\n"); | |
01618498 | 5602 | *p3 = (unsigned char) on_failure_jump; |
fa9a63c5 | 5603 | } |
99633e97 | 5604 | DEBUG_STATEMENT (debug -= 2); |
25fe55af | 5605 | } |
505bde11 | 5606 | break; |
25fe55af RS |
5607 | |
5608 | /* Unconditionally jump (without popping any failure points). */ | |
5609 | case jump: | |
fa9a63c5 | 5610 | unconditional_jump: |
5b370c2b | 5611 | IMMEDIATE_QUIT_CHECK; |
fa9a63c5 | 5612 | EXTRACT_NUMBER_AND_INCR (mcnt, p); /* Get the amount to jump. */ |
25fe55af RS |
5613 | DEBUG_PRINT2 ("EXECUTING jump %d ", mcnt); |
5614 | p += mcnt; /* Do the jump. */ | |
505bde11 | 5615 | DEBUG_PRINT2 ("(to %p).\n", p); |
25fe55af RS |
5616 | break; |
5617 | ||
5618 | ||
25fe55af RS |
5619 | /* Have to succeed matching what follows at least n times. |
5620 | After that, handle like `on_failure_jump'. */ | |
5621 | case succeed_n: | |
01618498 | 5622 | /* Signedness doesn't matter since we only compare MCNT to 0. */ |
25fe55af RS |
5623 | EXTRACT_NUMBER (mcnt, p + 2); |
5624 | DEBUG_PRINT2 ("EXECUTING succeed_n %d.\n", mcnt); | |
5e69f11e | 5625 | |
dc1e502d SM |
5626 | /* Originally, mcnt is how many times we HAVE to succeed. */ |
5627 | if (mcnt != 0) | |
25fe55af | 5628 | { |
6dcf2d0e SM |
5629 | /* Here, we discard `const', making re_match non-reentrant. */ |
5630 | unsigned char *p2 = (unsigned char*) p + 2; /* counter loc. */ | |
dc1e502d | 5631 | mcnt--; |
01618498 SM |
5632 | p += 4; |
5633 | PUSH_NUMBER (p2, mcnt); | |
25fe55af | 5634 | } |
dc1e502d SM |
5635 | else |
5636 | /* The two bytes encoding mcnt == 0 are two no_op opcodes. */ | |
5637 | goto on_failure; | |
25fe55af RS |
5638 | break; |
5639 | ||
5640 | case jump_n: | |
01618498 | 5641 | /* Signedness doesn't matter since we only compare MCNT to 0. */ |
25fe55af RS |
5642 | EXTRACT_NUMBER (mcnt, p + 2); |
5643 | DEBUG_PRINT2 ("EXECUTING jump_n %d.\n", mcnt); | |
5644 | ||
5645 | /* Originally, this is how many times we CAN jump. */ | |
dc1e502d | 5646 | if (mcnt != 0) |
25fe55af | 5647 | { |
6dcf2d0e SM |
5648 | /* Here, we discard `const', making re_match non-reentrant. */ |
5649 | unsigned char *p2 = (unsigned char*) p + 2; /* counter loc. */ | |
dc1e502d | 5650 | mcnt--; |
01618498 | 5651 | PUSH_NUMBER (p2, mcnt); |
dc1e502d | 5652 | goto unconditional_jump; |
25fe55af RS |
5653 | } |
5654 | /* If don't have to jump any more, skip over the rest of command. */ | |
5e69f11e RM |
5655 | else |
5656 | p += 4; | |
25fe55af | 5657 | break; |
5e69f11e | 5658 | |
fa9a63c5 RM |
5659 | case set_number_at: |
5660 | { | |
01618498 | 5661 | unsigned char *p2; /* Location of the counter. */ |
25fe55af | 5662 | DEBUG_PRINT1 ("EXECUTING set_number_at.\n"); |
fa9a63c5 | 5663 | |
25fe55af | 5664 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
6dcf2d0e SM |
5665 | /* Here, we discard `const', making re_match non-reentrant. */ |
5666 | p2 = (unsigned char*) p + mcnt; | |
01618498 | 5667 | /* Signedness doesn't matter since we only copy MCNT's bits . */ |
25fe55af | 5668 | EXTRACT_NUMBER_AND_INCR (mcnt, p); |
01618498 SM |
5669 | DEBUG_PRINT3 (" Setting %p to %d.\n", p2, mcnt); |
5670 | PUSH_NUMBER (p2, mcnt); | |
25fe55af RS |
5671 | break; |
5672 | } | |
9121ca40 KH |
5673 | |
5674 | case wordbound: | |
66f0296e SM |
5675 | case notwordbound: |
5676 | not = (re_opcode_t) *(p - 1) == notwordbound; | |
5677 | DEBUG_PRINT2 ("EXECUTING %swordbound.\n", not?"not":""); | |
fa9a63c5 | 5678 | |
99633e97 | 5679 | /* We SUCCEED (or FAIL) in one of the following cases: */ |
9121ca40 | 5680 | |
b18215fc | 5681 | /* Case 1: D is at the beginning or the end of string. */ |
9121ca40 | 5682 | if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d)) |
66f0296e | 5683 | not = !not; |
b18215fc RS |
5684 | else |
5685 | { | |
5686 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5687 | is the character at D, and S2 is the syntax of C2. */ | |
01618498 SM |
5688 | re_wchar_t c1, c2; |
5689 | int s1, s2; | |
b18215fc | 5690 | #ifdef emacs |
2d1675e4 SM |
5691 | int offset = PTR_TO_OFFSET (d - 1); |
5692 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (offset); | |
5d967c7a | 5693 | UPDATE_SYNTAX_TABLE (charpos); |
25fe55af | 5694 | #endif |
66f0296e | 5695 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); |
b18215fc RS |
5696 | s1 = SYNTAX (c1); |
5697 | #ifdef emacs | |
5d967c7a | 5698 | UPDATE_SYNTAX_TABLE_FORWARD (charpos + 1); |
25fe55af | 5699 | #endif |
f1ad044f | 5700 | PREFETCH_NOLIMIT (); |
2d1675e4 | 5701 | c2 = RE_STRING_CHAR (d, dend - d); |
b18215fc RS |
5702 | s2 = SYNTAX (c2); |
5703 | ||
5704 | if (/* Case 2: Only one of S1 and S2 is Sword. */ | |
5705 | ((s1 == Sword) != (s2 == Sword)) | |
5706 | /* Case 3: Both of S1 and S2 are Sword, and macro | |
25fe55af | 5707 | WORD_BOUNDARY_P (C1, C2) returns nonzero. */ |
b18215fc | 5708 | || ((s1 == Sword) && WORD_BOUNDARY_P (c1, c2))) |
66f0296e SM |
5709 | not = !not; |
5710 | } | |
5711 | if (not) | |
9121ca40 | 5712 | break; |
b18215fc | 5713 | else |
9121ca40 | 5714 | goto fail; |
fa9a63c5 RM |
5715 | |
5716 | case wordbeg: | |
25fe55af | 5717 | DEBUG_PRINT1 ("EXECUTING wordbeg.\n"); |
fa9a63c5 | 5718 | |
b18215fc RS |
5719 | /* We FAIL in one of the following cases: */ |
5720 | ||
25fe55af | 5721 | /* Case 1: D is at the end of string. */ |
b18215fc | 5722 | if (AT_STRINGS_END (d)) |
99633e97 | 5723 | goto fail; |
b18215fc RS |
5724 | else |
5725 | { | |
5726 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5727 | is the character at D, and S2 is the syntax of C2. */ | |
01618498 SM |
5728 | re_wchar_t c1, c2; |
5729 | int s1, s2; | |
fa9a63c5 | 5730 | #ifdef emacs |
2d1675e4 SM |
5731 | int offset = PTR_TO_OFFSET (d); |
5732 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (offset); | |
92432794 | 5733 | UPDATE_SYNTAX_TABLE (charpos); |
25fe55af | 5734 | #endif |
99633e97 | 5735 | PREFETCH (); |
2d1675e4 | 5736 | c2 = RE_STRING_CHAR (d, dend - d); |
b18215fc | 5737 | s2 = SYNTAX (c2); |
177c0ea7 | 5738 | |
b18215fc RS |
5739 | /* Case 2: S2 is not Sword. */ |
5740 | if (s2 != Sword) | |
5741 | goto fail; | |
5742 | ||
5743 | /* Case 3: D is not at the beginning of string ... */ | |
5744 | if (!AT_STRINGS_BEG (d)) | |
5745 | { | |
5746 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); | |
5747 | #ifdef emacs | |
5d967c7a | 5748 | UPDATE_SYNTAX_TABLE_BACKWARD (charpos - 1); |
25fe55af | 5749 | #endif |
b18215fc RS |
5750 | s1 = SYNTAX (c1); |
5751 | ||
5752 | /* ... and S1 is Sword, and WORD_BOUNDARY_P (C1, C2) | |
25fe55af | 5753 | returns 0. */ |
b18215fc RS |
5754 | if ((s1 == Sword) && !WORD_BOUNDARY_P (c1, c2)) |
5755 | goto fail; | |
5756 | } | |
5757 | } | |
e318085a RS |
5758 | break; |
5759 | ||
b18215fc | 5760 | case wordend: |
25fe55af | 5761 | DEBUG_PRINT1 ("EXECUTING wordend.\n"); |
b18215fc RS |
5762 | |
5763 | /* We FAIL in one of the following cases: */ | |
5764 | ||
5765 | /* Case 1: D is at the beginning of string. */ | |
5766 | if (AT_STRINGS_BEG (d)) | |
e318085a | 5767 | goto fail; |
b18215fc RS |
5768 | else |
5769 | { | |
5770 | /* C1 is the character before D, S1 is the syntax of C1, C2 | |
5771 | is the character at D, and S2 is the syntax of C2. */ | |
01618498 SM |
5772 | re_wchar_t c1, c2; |
5773 | int s1, s2; | |
5d967c7a | 5774 | #ifdef emacs |
2d1675e4 SM |
5775 | int offset = PTR_TO_OFFSET (d) - 1; |
5776 | int charpos = SYNTAX_TABLE_BYTE_TO_CHAR (offset); | |
92432794 | 5777 | UPDATE_SYNTAX_TABLE (charpos); |
5d967c7a | 5778 | #endif |
99633e97 | 5779 | GET_CHAR_BEFORE_2 (c1, d, string1, end1, string2, end2); |
b18215fc RS |
5780 | s1 = SYNTAX (c1); |
5781 | ||
5782 | /* Case 2: S1 is not Sword. */ | |
5783 | if (s1 != Sword) | |
5784 | goto fail; | |
5785 | ||
5786 | /* Case 3: D is not at the end of string ... */ | |
5787 | if (!AT_STRINGS_END (d)) | |
5788 | { | |
f1ad044f | 5789 | PREFETCH_NOLIMIT (); |
2d1675e4 | 5790 | c2 = RE_STRING_CHAR (d, dend - d); |
5d967c7a RS |
5791 | #ifdef emacs |
5792 | UPDATE_SYNTAX_TABLE_FORWARD (charpos); | |
5793 | #endif | |
b18215fc RS |
5794 | s2 = SYNTAX (c2); |
5795 | ||
5796 | /* ... and S2 is Sword, and WORD_BOUNDARY_P (C1, C2) | |
25fe55af | 5797 | returns 0. */ |
b18215fc | 5798 | if ((s2 == Sword) && !WORD_BOUNDARY_P (c1, c2)) |
25fe55af | 5799 | goto fail; |
b18215fc RS |
5800 | } |
5801 | } | |
e318085a RS |
5802 | break; |
5803 | ||
fa9a63c5 | 5804 | case syntaxspec: |
1fb352e0 SM |
5805 | case notsyntaxspec: |
5806 | not = (re_opcode_t) *(p - 1) == notsyntaxspec; | |
fa9a63c5 | 5807 | mcnt = *p++; |
1fb352e0 | 5808 | DEBUG_PRINT3 ("EXECUTING %ssyntaxspec %d.\n", not?"not":"", mcnt); |
fa9a63c5 | 5809 | PREFETCH (); |
b18215fc RS |
5810 | #ifdef emacs |
5811 | { | |
2d1675e4 SM |
5812 | int offset = PTR_TO_OFFSET (d); |
5813 | int pos1 = SYNTAX_TABLE_BYTE_TO_CHAR (offset); | |
b18215fc RS |
5814 | UPDATE_SYNTAX_TABLE (pos1); |
5815 | } | |
25fe55af | 5816 | #endif |
b18215fc | 5817 | { |
01618498 SM |
5818 | int len; |
5819 | re_wchar_t c; | |
b18215fc | 5820 | |
2d1675e4 | 5821 | c = RE_STRING_CHAR_AND_LENGTH (d, dend - d, len); |
b18215fc | 5822 | |
990b2375 | 5823 | if ((SYNTAX (c) != (enum syntaxcode) mcnt) ^ not) |
1fb352e0 | 5824 | goto fail; |
b18215fc RS |
5825 | d += len; |
5826 | } | |
fa9a63c5 RM |
5827 | break; |
5828 | ||
b18215fc | 5829 | #ifdef emacs |
1fb352e0 SM |
5830 | case before_dot: |
5831 | DEBUG_PRINT1 ("EXECUTING before_dot.\n"); | |
5832 | if (PTR_BYTE_POS (d) >= PT_BYTE) | |
fa9a63c5 | 5833 | goto fail; |
b18215fc RS |
5834 | break; |
5835 | ||
1fb352e0 SM |
5836 | case at_dot: |
5837 | DEBUG_PRINT1 ("EXECUTING at_dot.\n"); | |
5838 | if (PTR_BYTE_POS (d) != PT_BYTE) | |
5839 | goto fail; | |
5840 | break; | |
b18215fc | 5841 | |
1fb352e0 SM |
5842 | case after_dot: |
5843 | DEBUG_PRINT1 ("EXECUTING after_dot.\n"); | |
5844 | if (PTR_BYTE_POS (d) <= PT_BYTE) | |
5845 | goto fail; | |
e318085a | 5846 | break; |
fa9a63c5 | 5847 | |
1fb352e0 | 5848 | case categoryspec: |
b18215fc | 5849 | case notcategoryspec: |
1fb352e0 | 5850 | not = (re_opcode_t) *(p - 1) == notcategoryspec; |
b18215fc | 5851 | mcnt = *p++; |
1fb352e0 | 5852 | DEBUG_PRINT3 ("EXECUTING %scategoryspec %d.\n", not?"not":"", mcnt); |
b18215fc RS |
5853 | PREFETCH (); |
5854 | { | |
01618498 SM |
5855 | int len; |
5856 | re_wchar_t c; | |
5857 | ||
2d1675e4 | 5858 | c = RE_STRING_CHAR_AND_LENGTH (d, dend - d, len); |
b18215fc | 5859 | |
1fb352e0 | 5860 | if ((!CHAR_HAS_CATEGORY (c, mcnt)) ^ not) |
b18215fc RS |
5861 | goto fail; |
5862 | d += len; | |
5863 | } | |
fa9a63c5 | 5864 | break; |
5e69f11e | 5865 | |
1fb352e0 | 5866 | #endif /* emacs */ |
5e69f11e | 5867 | |
0b32bf0e SM |
5868 | default: |
5869 | abort (); | |
fa9a63c5 | 5870 | } |
b18215fc | 5871 | continue; /* Successfully executed one pattern command; keep going. */ |
fa9a63c5 RM |
5872 | |
5873 | ||
5874 | /* We goto here if a matching operation fails. */ | |
5875 | fail: | |
5b370c2b | 5876 | IMMEDIATE_QUIT_CHECK; |
fa9a63c5 | 5877 | if (!FAIL_STACK_EMPTY ()) |
505bde11 | 5878 | { |
01618498 | 5879 | re_char *str, *pat; |
505bde11 | 5880 | /* A restart point is known. Restore to that state. */ |
0b32bf0e SM |
5881 | DEBUG_PRINT1 ("\nFAIL:\n"); |
5882 | POP_FAILURE_POINT (str, pat); | |
505bde11 SM |
5883 | switch (SWITCH_ENUM_CAST ((re_opcode_t) *pat++)) |
5884 | { | |
5885 | case on_failure_keep_string_jump: | |
5886 | assert (str == NULL); | |
5887 | goto continue_failure_jump; | |
5888 | ||
0683b6fa SM |
5889 | case on_failure_jump_nastyloop: |
5890 | assert ((re_opcode_t)pat[-2] == no_op); | |
5891 | PUSH_FAILURE_POINT (pat - 2, str); | |
5892 | /* Fallthrough */ | |
5893 | ||
505bde11 SM |
5894 | case on_failure_jump_loop: |
5895 | case on_failure_jump: | |
5896 | case succeed_n: | |
5897 | d = str; | |
5898 | continue_failure_jump: | |
5899 | EXTRACT_NUMBER_AND_INCR (mcnt, pat); | |
5900 | p = pat + mcnt; | |
5901 | break; | |
b18215fc | 5902 | |
0683b6fa SM |
5903 | case no_op: |
5904 | /* A special frame used for nastyloops. */ | |
5905 | goto fail; | |
5906 | ||
505bde11 SM |
5907 | default: |
5908 | abort(); | |
5909 | } | |
fa9a63c5 | 5910 | |
505bde11 | 5911 | assert (p >= bufp->buffer && p <= pend); |
b18215fc | 5912 | |
0b32bf0e | 5913 | if (d >= string1 && d <= end1) |
fa9a63c5 | 5914 | dend = end_match_1; |
0b32bf0e | 5915 | } |
fa9a63c5 | 5916 | else |
0b32bf0e | 5917 | break; /* Matching at this starting point really fails. */ |
fa9a63c5 RM |
5918 | } /* for (;;) */ |
5919 | ||
5920 | if (best_regs_set) | |
5921 | goto restore_best_regs; | |
5922 | ||
5923 | FREE_VARIABLES (); | |
5924 | ||
b18215fc | 5925 | return -1; /* Failure to match. */ |
fa9a63c5 RM |
5926 | } /* re_match_2 */ |
5927 | \f | |
5928 | /* Subroutine definitions for re_match_2. */ | |
5929 | ||
fa9a63c5 RM |
5930 | /* Return zero if TRANSLATE[S1] and TRANSLATE[S2] are identical for LEN |
5931 | bytes; nonzero otherwise. */ | |
5e69f11e | 5932 | |
fa9a63c5 | 5933 | static int |
2d1675e4 SM |
5934 | bcmp_translate (s1, s2, len, translate, multibyte) |
5935 | re_char *s1, *s2; | |
fa9a63c5 | 5936 | register int len; |
6676cb1c | 5937 | RE_TRANSLATE_TYPE translate; |
2d1675e4 | 5938 | const int multibyte; |
fa9a63c5 | 5939 | { |
2d1675e4 SM |
5940 | register re_char *p1 = s1, *p2 = s2; |
5941 | re_char *p1_end = s1 + len; | |
5942 | re_char *p2_end = s2 + len; | |
e934739e | 5943 | |
4bb91c68 SM |
5944 | /* FIXME: Checking both p1 and p2 presumes that the two strings might have |
5945 | different lengths, but relying on a single `len' would break this. -sm */ | |
5946 | while (p1 < p1_end && p2 < p2_end) | |
fa9a63c5 | 5947 | { |
e934739e | 5948 | int p1_charlen, p2_charlen; |
01618498 | 5949 | re_wchar_t p1_ch, p2_ch; |
e934739e | 5950 | |
2d1675e4 SM |
5951 | p1_ch = RE_STRING_CHAR_AND_LENGTH (p1, p1_end - p1, p1_charlen); |
5952 | p2_ch = RE_STRING_CHAR_AND_LENGTH (p2, p2_end - p2, p2_charlen); | |
e934739e RS |
5953 | |
5954 | if (RE_TRANSLATE (translate, p1_ch) | |
5955 | != RE_TRANSLATE (translate, p2_ch)) | |
bc192b5b | 5956 | return 1; |
e934739e RS |
5957 | |
5958 | p1 += p1_charlen, p2 += p2_charlen; | |
fa9a63c5 | 5959 | } |
e934739e RS |
5960 | |
5961 | if (p1 != p1_end || p2 != p2_end) | |
5962 | return 1; | |
5963 | ||
fa9a63c5 RM |
5964 | return 0; |
5965 | } | |
5966 | \f | |
5967 | /* Entry points for GNU code. */ | |
5968 | ||
5969 | /* re_compile_pattern is the GNU regular expression compiler: it | |
5970 | compiles PATTERN (of length SIZE) and puts the result in BUFP. | |
5971 | Returns 0 if the pattern was valid, otherwise an error string. | |
5e69f11e | 5972 | |
fa9a63c5 RM |
5973 | Assumes the `allocated' (and perhaps `buffer') and `translate' fields |
5974 | are set in BUFP on entry. | |
5e69f11e | 5975 | |
b18215fc | 5976 | We call regex_compile to do the actual compilation. */ |
fa9a63c5 RM |
5977 | |
5978 | const char * | |
5979 | re_compile_pattern (pattern, length, bufp) | |
5980 | const char *pattern; | |
0b32bf0e | 5981 | size_t length; |
fa9a63c5 RM |
5982 | struct re_pattern_buffer *bufp; |
5983 | { | |
5984 | reg_errcode_t ret; | |
5e69f11e | 5985 | |
fa9a63c5 RM |
5986 | /* GNU code is written to assume at least RE_NREGS registers will be set |
5987 | (and at least one extra will be -1). */ | |
5988 | bufp->regs_allocated = REGS_UNALLOCATED; | |
5e69f11e | 5989 | |
fa9a63c5 RM |
5990 | /* And GNU code determines whether or not to get register information |
5991 | by passing null for the REGS argument to re_match, etc., not by | |
5992 | setting no_sub. */ | |
5993 | bufp->no_sub = 0; | |
5e69f11e | 5994 | |
4bb91c68 | 5995 | ret = regex_compile ((re_char*) pattern, length, re_syntax_options, bufp); |
fa9a63c5 RM |
5996 | |
5997 | if (!ret) | |
5998 | return NULL; | |
5999 | return gettext (re_error_msgid[(int) ret]); | |
5e69f11e | 6000 | } |
c0f9ea08 | 6001 | WEAK_ALIAS (__re_compile_pattern, re_compile_pattern) |
fa9a63c5 | 6002 | \f |
b18215fc RS |
6003 | /* Entry points compatible with 4.2 BSD regex library. We don't define |
6004 | them unless specifically requested. */ | |
fa9a63c5 | 6005 | |
0b32bf0e | 6006 | #if defined _REGEX_RE_COMP || defined _LIBC |
fa9a63c5 RM |
6007 | |
6008 | /* BSD has one and only one pattern buffer. */ | |
6009 | static struct re_pattern_buffer re_comp_buf; | |
6010 | ||
6011 | char * | |
0b32bf0e | 6012 | # ifdef _LIBC |
48afdd44 RM |
6013 | /* Make these definitions weak in libc, so POSIX programs can redefine |
6014 | these names if they don't use our functions, and still use | |
6015 | regcomp/regexec below without link errors. */ | |
6016 | weak_function | |
0b32bf0e | 6017 | # endif |
fa9a63c5 RM |
6018 | re_comp (s) |
6019 | const char *s; | |
6020 | { | |
6021 | reg_errcode_t ret; | |
5e69f11e | 6022 | |
fa9a63c5 RM |
6023 | if (!s) |
6024 | { | |
6025 | if (!re_comp_buf.buffer) | |
0b32bf0e | 6026 | /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */ |
a60198e5 | 6027 | return (char *) gettext ("No previous regular expression"); |
fa9a63c5 RM |
6028 | return 0; |
6029 | } | |
6030 | ||
6031 | if (!re_comp_buf.buffer) | |
6032 | { | |
6033 | re_comp_buf.buffer = (unsigned char *) malloc (200); | |
6034 | if (re_comp_buf.buffer == NULL) | |
0b32bf0e SM |
6035 | /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */ |
6036 | return (char *) gettext (re_error_msgid[(int) REG_ESPACE]); | |
fa9a63c5 RM |
6037 | re_comp_buf.allocated = 200; |
6038 | ||
6039 | re_comp_buf.fastmap = (char *) malloc (1 << BYTEWIDTH); | |
6040 | if (re_comp_buf.fastmap == NULL) | |
a60198e5 SM |
6041 | /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */ |
6042 | return (char *) gettext (re_error_msgid[(int) REG_ESPACE]); | |
fa9a63c5 RM |
6043 | } |
6044 | ||
6045 | /* Since `re_exec' always passes NULL for the `regs' argument, we | |
6046 | don't need to initialize the pattern buffer fields which affect it. */ | |
6047 | ||
fa9a63c5 | 6048 | ret = regex_compile (s, strlen (s), re_syntax_options, &re_comp_buf); |
5e69f11e | 6049 | |
fa9a63c5 RM |
6050 | if (!ret) |
6051 | return NULL; | |
6052 | ||
6053 | /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */ | |
6054 | return (char *) gettext (re_error_msgid[(int) ret]); | |
6055 | } | |
6056 | ||
6057 | ||
6058 | int | |
0b32bf0e | 6059 | # ifdef _LIBC |
48afdd44 | 6060 | weak_function |
0b32bf0e | 6061 | # endif |
fa9a63c5 RM |
6062 | re_exec (s) |
6063 | const char *s; | |
6064 | { | |
6065 | const int len = strlen (s); | |
6066 | return | |
6067 | 0 <= re_search (&re_comp_buf, s, len, 0, len, (struct re_registers *) 0); | |
6068 | } | |
6069 | #endif /* _REGEX_RE_COMP */ | |
6070 | \f | |
6071 | /* POSIX.2 functions. Don't define these for Emacs. */ | |
6072 | ||
6073 | #ifndef emacs | |
6074 | ||
6075 | /* regcomp takes a regular expression as a string and compiles it. | |
6076 | ||
b18215fc | 6077 | PREG is a regex_t *. We do not expect any fields to be initialized, |
fa9a63c5 RM |
6078 | since POSIX says we shouldn't. Thus, we set |
6079 | ||
6080 | `buffer' to the compiled pattern; | |
6081 | `used' to the length of the compiled pattern; | |
6082 | `syntax' to RE_SYNTAX_POSIX_EXTENDED if the | |
6083 | REG_EXTENDED bit in CFLAGS is set; otherwise, to | |
6084 | RE_SYNTAX_POSIX_BASIC; | |
c0f9ea08 SM |
6085 | `fastmap' to an allocated space for the fastmap; |
6086 | `fastmap_accurate' to zero; | |
fa9a63c5 RM |
6087 | `re_nsub' to the number of subexpressions in PATTERN. |
6088 | ||
6089 | PATTERN is the address of the pattern string. | |
6090 | ||
6091 | CFLAGS is a series of bits which affect compilation. | |
6092 | ||
6093 | If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we | |
6094 | use POSIX basic syntax. | |
6095 | ||
6096 | If REG_NEWLINE is set, then . and [^...] don't match newline. | |
6097 | Also, regexec will try a match beginning after every newline. | |
6098 | ||
6099 | If REG_ICASE is set, then we considers upper- and lowercase | |
6100 | versions of letters to be equivalent when matching. | |
6101 | ||
6102 | If REG_NOSUB is set, then when PREG is passed to regexec, that | |
6103 | routine will report only success or failure, and nothing about the | |
6104 | registers. | |
6105 | ||
b18215fc | 6106 | It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for |
fa9a63c5 RM |
6107 | the return codes and their meanings.) */ |
6108 | ||
6109 | int | |
6110 | regcomp (preg, pattern, cflags) | |
ada30c0e SM |
6111 | regex_t *__restrict preg; |
6112 | const char *__restrict pattern; | |
fa9a63c5 RM |
6113 | int cflags; |
6114 | { | |
6115 | reg_errcode_t ret; | |
4bb91c68 | 6116 | reg_syntax_t syntax |
fa9a63c5 RM |
6117 | = (cflags & REG_EXTENDED) ? |
6118 | RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC; | |
6119 | ||
6120 | /* regex_compile will allocate the space for the compiled pattern. */ | |
6121 | preg->buffer = 0; | |
6122 | preg->allocated = 0; | |
6123 | preg->used = 0; | |
5e69f11e | 6124 | |
c0f9ea08 SM |
6125 | /* Try to allocate space for the fastmap. */ |
6126 | preg->fastmap = (char *) malloc (1 << BYTEWIDTH); | |
5e69f11e | 6127 | |
fa9a63c5 RM |
6128 | if (cflags & REG_ICASE) |
6129 | { | |
6130 | unsigned i; | |
5e69f11e | 6131 | |
6676cb1c RS |
6132 | preg->translate |
6133 | = (RE_TRANSLATE_TYPE) malloc (CHAR_SET_SIZE | |
6134 | * sizeof (*(RE_TRANSLATE_TYPE)0)); | |
fa9a63c5 | 6135 | if (preg->translate == NULL) |
0b32bf0e | 6136 | return (int) REG_ESPACE; |
fa9a63c5 RM |
6137 | |
6138 | /* Map uppercase characters to corresponding lowercase ones. */ | |
6139 | for (i = 0; i < CHAR_SET_SIZE; i++) | |
4bb91c68 | 6140 | preg->translate[i] = ISUPPER (i) ? TOLOWER (i) : i; |
fa9a63c5 RM |
6141 | } |
6142 | else | |
6143 | preg->translate = NULL; | |
6144 | ||
6145 | /* If REG_NEWLINE is set, newlines are treated differently. */ | |
6146 | if (cflags & REG_NEWLINE) | |
6147 | { /* REG_NEWLINE implies neither . nor [^...] match newline. */ | |
6148 | syntax &= ~RE_DOT_NEWLINE; | |
6149 | syntax |= RE_HAT_LISTS_NOT_NEWLINE; | |
fa9a63c5 RM |
6150 | } |
6151 | else | |
c0f9ea08 | 6152 | syntax |= RE_NO_NEWLINE_ANCHOR; |
fa9a63c5 RM |
6153 | |
6154 | preg->no_sub = !!(cflags & REG_NOSUB); | |
6155 | ||
5e69f11e | 6156 | /* POSIX says a null character in the pattern terminates it, so we |
fa9a63c5 | 6157 | can use strlen here in compiling the pattern. */ |
4bb91c68 | 6158 | ret = regex_compile ((re_char*) pattern, strlen (pattern), syntax, preg); |
5e69f11e | 6159 | |
fa9a63c5 RM |
6160 | /* POSIX doesn't distinguish between an unmatched open-group and an |
6161 | unmatched close-group: both are REG_EPAREN. */ | |
c0f9ea08 SM |
6162 | if (ret == REG_ERPAREN) |
6163 | ret = REG_EPAREN; | |
6164 | ||
6165 | if (ret == REG_NOERROR && preg->fastmap) | |
6166 | { /* Compute the fastmap now, since regexec cannot modify the pattern | |
6167 | buffer. */ | |
6168 | re_compile_fastmap (preg); | |
6169 | if (preg->can_be_null) | |
6170 | { /* The fastmap can't be used anyway. */ | |
6171 | free (preg->fastmap); | |
6172 | preg->fastmap = NULL; | |
6173 | } | |
6174 | } | |
fa9a63c5 RM |
6175 | return (int) ret; |
6176 | } | |
c0f9ea08 | 6177 | WEAK_ALIAS (__regcomp, regcomp) |
fa9a63c5 RM |
6178 | |
6179 | ||
6180 | /* regexec searches for a given pattern, specified by PREG, in the | |
6181 | string STRING. | |
5e69f11e | 6182 | |
fa9a63c5 | 6183 | If NMATCH is zero or REG_NOSUB was set in the cflags argument to |
b18215fc | 6184 | `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at |
fa9a63c5 RM |
6185 | least NMATCH elements, and we set them to the offsets of the |
6186 | corresponding matched substrings. | |
5e69f11e | 6187 | |
fa9a63c5 RM |
6188 | EFLAGS specifies `execution flags' which affect matching: if |
6189 | REG_NOTBOL is set, then ^ does not match at the beginning of the | |
6190 | string; if REG_NOTEOL is set, then $ does not match at the end. | |
5e69f11e | 6191 | |
fa9a63c5 RM |
6192 | We return 0 if we find a match and REG_NOMATCH if not. */ |
6193 | ||
6194 | int | |
6195 | regexec (preg, string, nmatch, pmatch, eflags) | |
ada30c0e SM |
6196 | const regex_t *__restrict preg; |
6197 | const char *__restrict string; | |
5e69f11e | 6198 | size_t nmatch; |
9f2dbe01 | 6199 | regmatch_t pmatch[__restrict_arr]; |
fa9a63c5 RM |
6200 | int eflags; |
6201 | { | |
6202 | int ret; | |
6203 | struct re_registers regs; | |
6204 | regex_t private_preg; | |
6205 | int len = strlen (string); | |
c0f9ea08 | 6206 | boolean want_reg_info = !preg->no_sub && nmatch > 0 && pmatch; |
fa9a63c5 RM |
6207 | |
6208 | private_preg = *preg; | |
5e69f11e | 6209 | |
fa9a63c5 RM |
6210 | private_preg.not_bol = !!(eflags & REG_NOTBOL); |
6211 | private_preg.not_eol = !!(eflags & REG_NOTEOL); | |
5e69f11e | 6212 | |
fa9a63c5 RM |
6213 | /* The user has told us exactly how many registers to return |
6214 | information about, via `nmatch'. We have to pass that on to the | |
b18215fc | 6215 | matching routines. */ |
fa9a63c5 | 6216 | private_preg.regs_allocated = REGS_FIXED; |
5e69f11e | 6217 | |
fa9a63c5 RM |
6218 | if (want_reg_info) |
6219 | { | |
6220 | regs.num_regs = nmatch; | |
4bb91c68 SM |
6221 | regs.start = TALLOC (nmatch * 2, regoff_t); |
6222 | if (regs.start == NULL) | |
0b32bf0e | 6223 | return (int) REG_NOMATCH; |
4bb91c68 | 6224 | regs.end = regs.start + nmatch; |
fa9a63c5 RM |
6225 | } |
6226 | ||
c0f9ea08 SM |
6227 | /* Instead of using not_eol to implement REG_NOTEOL, we could simply |
6228 | pass (&private_preg, string, len + 1, 0, len, ...) pretending the string | |
6229 | was a little bit longer but still only matching the real part. | |
6230 | This works because the `endline' will check for a '\n' and will find a | |
6231 | '\0', correctly deciding that this is not the end of a line. | |
6232 | But it doesn't work out so nicely for REG_NOTBOL, since we don't have | |
6233 | a convenient '\0' there. For all we know, the string could be preceded | |
6234 | by '\n' which would throw things off. */ | |
6235 | ||
fa9a63c5 RM |
6236 | /* Perform the searching operation. */ |
6237 | ret = re_search (&private_preg, string, len, | |
0b32bf0e SM |
6238 | /* start: */ 0, /* range: */ len, |
6239 | want_reg_info ? ®s : (struct re_registers *) 0); | |
5e69f11e | 6240 | |
fa9a63c5 RM |
6241 | /* Copy the register information to the POSIX structure. */ |
6242 | if (want_reg_info) | |
6243 | { | |
6244 | if (ret >= 0) | |
0b32bf0e SM |
6245 | { |
6246 | unsigned r; | |
fa9a63c5 | 6247 | |
0b32bf0e SM |
6248 | for (r = 0; r < nmatch; r++) |
6249 | { | |
6250 | pmatch[r].rm_so = regs.start[r]; | |
6251 | pmatch[r].rm_eo = regs.end[r]; | |
6252 | } | |
6253 | } | |
fa9a63c5 | 6254 | |
b18215fc | 6255 | /* If we needed the temporary register info, free the space now. */ |
fa9a63c5 | 6256 | free (regs.start); |
fa9a63c5 RM |
6257 | } |
6258 | ||
6259 | /* We want zero return to mean success, unlike `re_search'. */ | |
6260 | return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH; | |
6261 | } | |
c0f9ea08 | 6262 | WEAK_ALIAS (__regexec, regexec) |
fa9a63c5 RM |
6263 | |
6264 | ||
6265 | /* Returns a message corresponding to an error code, ERRCODE, returned | |
6266 | from either regcomp or regexec. We don't use PREG here. */ | |
6267 | ||
6268 | size_t | |
6269 | regerror (errcode, preg, errbuf, errbuf_size) | |
6270 | int errcode; | |
6271 | const regex_t *preg; | |
6272 | char *errbuf; | |
6273 | size_t errbuf_size; | |
6274 | { | |
6275 | const char *msg; | |
6276 | size_t msg_size; | |
6277 | ||
6278 | if (errcode < 0 | |
6279 | || errcode >= (sizeof (re_error_msgid) / sizeof (re_error_msgid[0]))) | |
5e69f11e | 6280 | /* Only error codes returned by the rest of the code should be passed |
b18215fc | 6281 | to this routine. If we are given anything else, or if other regex |
fa9a63c5 RM |
6282 | code generates an invalid error code, then the program has a bug. |
6283 | Dump core so we can fix it. */ | |
6284 | abort (); | |
6285 | ||
6286 | msg = gettext (re_error_msgid[errcode]); | |
6287 | ||
6288 | msg_size = strlen (msg) + 1; /* Includes the null. */ | |
5e69f11e | 6289 | |
fa9a63c5 RM |
6290 | if (errbuf_size != 0) |
6291 | { | |
6292 | if (msg_size > errbuf_size) | |
0b32bf0e SM |
6293 | { |
6294 | strncpy (errbuf, msg, errbuf_size - 1); | |
6295 | errbuf[errbuf_size - 1] = 0; | |
6296 | } | |
fa9a63c5 | 6297 | else |
0b32bf0e | 6298 | strcpy (errbuf, msg); |
fa9a63c5 RM |
6299 | } |
6300 | ||
6301 | return msg_size; | |
6302 | } | |
c0f9ea08 | 6303 | WEAK_ALIAS (__regerror, regerror) |
fa9a63c5 RM |
6304 | |
6305 | ||
6306 | /* Free dynamically allocated space used by PREG. */ | |
6307 | ||
6308 | void | |
6309 | regfree (preg) | |
6310 | regex_t *preg; | |
6311 | { | |
6312 | if (preg->buffer != NULL) | |
6313 | free (preg->buffer); | |
6314 | preg->buffer = NULL; | |
5e69f11e | 6315 | |
fa9a63c5 RM |
6316 | preg->allocated = 0; |
6317 | preg->used = 0; | |
6318 | ||
6319 | if (preg->fastmap != NULL) | |
6320 | free (preg->fastmap); | |
6321 | preg->fastmap = NULL; | |
6322 | preg->fastmap_accurate = 0; | |
6323 | ||
6324 | if (preg->translate != NULL) | |
6325 | free (preg->translate); | |
6326 | preg->translate = NULL; | |
6327 | } | |
c0f9ea08 | 6328 | WEAK_ALIAS (__regfree, regfree) |
fa9a63c5 RM |
6329 | |
6330 | #endif /* not emacs */ |