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Revision 518 - (show annotations)
Tue May 18 15:47:01 2010 UTC (5 years, 3 months ago) by ph10
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File size: 14664 byte(s)
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Added PCRE_UCP and related stuff to make \w etc use Unicode properties.
1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2010 University of Cambridge
10
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright
19 notice, this list of conditions and the following disclaimer in the
20 documentation and/or other materials provided with the distribution.
21
22 * Neither the name of the University of Cambridge nor the names of its
23 contributors may be used to endorse or promote products derived from
24 this software without specific prior written permission.
25
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39
40
41 /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42 functions. */
43
44
45 #ifdef HAVE_CONFIG_H
46 #include "config.h"
47 #endif
48
49
50 /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51 compiling these functions. This must come before including pcreposix.h, where
52 they are set for an application (using these functions) if they have not
53 previously been set. */
54
55 #if defined(_WIN32) && !defined(PCRE_STATIC)
56 # define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
57 # define PCREPOSIX_EXP_DEFN __declspec(dllexport)
58 #endif
59
60 #include "pcre.h"
61 #include "pcre_internal.h"
62 #include "pcreposix.h"
63
64
65 /* Table to translate PCRE compile time error codes into POSIX error codes. */
66
67 static const int eint[] = {
68 0, /* no error */
69 REG_EESCAPE, /* \ at end of pattern */
70 REG_EESCAPE, /* \c at end of pattern */
71 REG_EESCAPE, /* unrecognized character follows \ */
72 REG_BADBR, /* numbers out of order in {} quantifier */
73 /* 5 */
74 REG_BADBR, /* number too big in {} quantifier */
75 REG_EBRACK, /* missing terminating ] for character class */
76 REG_ECTYPE, /* invalid escape sequence in character class */
77 REG_ERANGE, /* range out of order in character class */
78 REG_BADRPT, /* nothing to repeat */
79 /* 10 */
80 REG_BADRPT, /* operand of unlimited repeat could match the empty string */
81 REG_ASSERT, /* internal error: unexpected repeat */
82 REG_BADPAT, /* unrecognized character after (? */
83 REG_BADPAT, /* POSIX named classes are supported only within a class */
84 REG_EPAREN, /* missing ) */
85 /* 15 */
86 REG_ESUBREG, /* reference to non-existent subpattern */
87 REG_INVARG, /* erroffset passed as NULL */
88 REG_INVARG, /* unknown option bit(s) set */
89 REG_EPAREN, /* missing ) after comment */
90 REG_ESIZE, /* parentheses nested too deeply */
91 /* 20 */
92 REG_ESIZE, /* regular expression too large */
93 REG_ESPACE, /* failed to get memory */
94 REG_EPAREN, /* unmatched parentheses */
95 REG_ASSERT, /* internal error: code overflow */
96 REG_BADPAT, /* unrecognized character after (?< */
97 /* 25 */
98 REG_BADPAT, /* lookbehind assertion is not fixed length */
99 REG_BADPAT, /* malformed number or name after (?( */
100 REG_BADPAT, /* conditional group contains more than two branches */
101 REG_BADPAT, /* assertion expected after (?( */
102 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
103 /* 30 */
104 REG_ECTYPE, /* unknown POSIX class name */
105 REG_BADPAT, /* POSIX collating elements are not supported */
106 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
107 REG_BADPAT, /* spare error */
108 REG_BADPAT, /* character value in \x{...} sequence is too large */
109 /* 35 */
110 REG_BADPAT, /* invalid condition (?(0) */
111 REG_BADPAT, /* \C not allowed in lookbehind assertion */
112 REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
113 REG_BADPAT, /* number after (?C is > 255 */
114 REG_BADPAT, /* closing ) for (?C expected */
115 /* 40 */
116 REG_BADPAT, /* recursive call could loop indefinitely */
117 REG_BADPAT, /* unrecognized character after (?P */
118 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
119 REG_BADPAT, /* two named subpatterns have the same name */
120 REG_BADPAT, /* invalid UTF-8 string */
121 /* 45 */
122 REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
123 REG_BADPAT, /* malformed \P or \p sequence */
124 REG_BADPAT, /* unknown property name after \P or \p */
125 REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
126 REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
127 /* 50 */
128 REG_BADPAT, /* repeated subpattern is too long */
129 REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
130 REG_BADPAT, /* internal error: overran compiling workspace */
131 REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
132 REG_BADPAT, /* DEFINE group contains more than one branch */
133 /* 55 */
134 REG_BADPAT, /* repeating a DEFINE group is not allowed */
135 REG_INVARG, /* inconsistent NEWLINE options */
136 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
137 REG_BADPAT, /* a numbered reference must not be zero */
138 REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
139 /* 60 */
140 REG_BADPAT, /* (*VERB) not recognized */
141 REG_BADPAT, /* number is too big */
142 REG_BADPAT, /* subpattern name expected */
143 REG_BADPAT, /* digit expected after (?+ */
144 REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
145 /* 65 */
146 REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
147 REG_BADPAT, /* (*MARK) must have an argument */
148 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UCP support */
149 };
150
151 /* Table of texts corresponding to POSIX error codes */
152
153 static const char *const pstring[] = {
154 "", /* Dummy for value 0 */
155 "internal error", /* REG_ASSERT */
156 "invalid repeat counts in {}", /* BADBR */
157 "pattern error", /* BADPAT */
158 "? * + invalid", /* BADRPT */
159 "unbalanced {}", /* EBRACE */
160 "unbalanced []", /* EBRACK */
161 "collation error - not relevant", /* ECOLLATE */
162 "bad class", /* ECTYPE */
163 "bad escape sequence", /* EESCAPE */
164 "empty expression", /* EMPTY */
165 "unbalanced ()", /* EPAREN */
166 "bad range inside []", /* ERANGE */
167 "expression too big", /* ESIZE */
168 "failed to get memory", /* ESPACE */
169 "bad back reference", /* ESUBREG */
170 "bad argument", /* INVARG */
171 "match failed" /* NOMATCH */
172 };
173
174
175
176
177 /*************************************************
178 * Translate error code to string *
179 *************************************************/
180
181 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
182 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
183 {
184 const char *message, *addmessage;
185 size_t length, addlength;
186
187 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
188 "unknown error code" : pstring[errcode];
189 length = strlen(message) + 1;
190
191 addmessage = " at offset ";
192 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
193 strlen(addmessage) + 6 : 0;
194
195 if (errbuf_size > 0)
196 {
197 if (addlength > 0 && errbuf_size >= length + addlength)
198 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
199 else
200 {
201 strncpy(errbuf, message, errbuf_size - 1);
202 errbuf[errbuf_size-1] = 0;
203 }
204 }
205
206 return length + addlength;
207 }
208
209
210
211
212 /*************************************************
213 * Free store held by a regex *
214 *************************************************/
215
216 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
217 regfree(regex_t *preg)
218 {
219 (pcre_free)(preg->re_pcre);
220 }
221
222
223
224
225 /*************************************************
226 * Compile a regular expression *
227 *************************************************/
228
229 /*
230 Arguments:
231 preg points to a structure for recording the compiled expression
232 pattern the pattern to compile
233 cflags compilation flags
234
235 Returns: 0 on success
236 various non-zero codes on failure
237 */
238
239 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
240 regcomp(regex_t *preg, const char *pattern, int cflags)
241 {
242 const char *errorptr;
243 int erroffset;
244 int errorcode;
245 int options = 0;
246
247 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
248 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
249 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
250 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
251 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
252 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
253 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
254
255 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
256 &erroffset, NULL);
257 preg->re_erroffset = erroffset;
258
259 /* Safety: if the error code is too big for the translation vector (which
260 should not happen, but we all make mistakes), return REG_BADPAT. */
261
262 if (preg->re_pcre == NULL)
263 {
264 return (errorcode < sizeof(eint)/sizeof(const int))?
265 eint[errorcode] : REG_BADPAT;
266 }
267
268 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
269 return 0;
270 }
271
272
273
274
275 /*************************************************
276 * Match a regular expression *
277 *************************************************/
278
279 /* Unfortunately, PCRE requires 3 ints of working space for each captured
280 substring, so we have to get and release working store instead of just using
281 the POSIX structures as was done in earlier releases when PCRE needed only 2
282 ints. However, if the number of possible capturing brackets is small, use a
283 block of store on the stack, to reduce the use of malloc/free. The threshold is
284 in a macro that can be changed at configure time.
285
286 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
287 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
288 the only result is yes/no/error. */
289
290 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
291 regexec(const regex_t *preg, const char *string, size_t nmatch,
292 regmatch_t pmatch[], int eflags)
293 {
294 int rc, so, eo;
295 int options = 0;
296 int *ovector = NULL;
297 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
298 BOOL allocated_ovector = FALSE;
299 BOOL nosub =
300 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
301
302 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
303 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
304 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
305
306 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
307
308 /* When no string data is being returned, or no vector has been passed in which
309 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
310 the return data is large enough. */
311
312 if (nosub || pmatch == NULL) nmatch = 0;
313
314 else if (nmatch > 0)
315 {
316 if (nmatch <= POSIX_MALLOC_THRESHOLD)
317 {
318 ovector = &(small_ovector[0]);
319 }
320 else
321 {
322 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
323 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
324 if (ovector == NULL) return REG_ESPACE;
325 allocated_ovector = TRUE;
326 }
327 }
328
329 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
330 The man page from OS X says "REG_STARTEND affects only the location of the
331 string, not how it is matched". That is why the "so" value is used to bump the
332 start location rather than being passed as a PCRE "starting offset". */
333
334 if ((eflags & REG_STARTEND) != 0)
335 {
336 so = pmatch[0].rm_so;
337 eo = pmatch[0].rm_eo;
338 }
339 else
340 {
341 so = 0;
342 eo = strlen(string);
343 }
344
345 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
346 0, options, ovector, nmatch * 3);
347
348 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
349
350 /* Successful match */
351
352 if (rc >= 0)
353 {
354 size_t i;
355 if (!nosub)
356 {
357 for (i = 0; i < (size_t)rc; i++)
358 {
359 pmatch[i].rm_so = ovector[i*2];
360 pmatch[i].rm_eo = ovector[i*2+1];
361 }
362 if (allocated_ovector) free(ovector);
363 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
364 }
365 return 0;
366 }
367
368 /* Unsuccessful match */
369
370 if (allocated_ovector) free(ovector);
371 switch(rc)
372 {
373 /* ========================================================================== */
374 /* These cases are never obeyed. This is a fudge that causes a compile-time
375 error if the vector eint, which is indexed by compile-time error number, is
376 not the correct length. It seems to be the only way to do such a check at
377 compile time, as the sizeof() operator does not work in the C preprocessor.
378 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
379
380 case 0:
381 case (sizeof(eint)/sizeof(int) == ERRCOUNT):
382 return REG_ASSERT;
383 /* ========================================================================== */
384
385 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
386 case PCRE_ERROR_NULL: return REG_INVARG;
387 case PCRE_ERROR_BADOPTION: return REG_INVARG;
388 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
389 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
390 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
391 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
392 case PCRE_ERROR_BADUTF8: return REG_INVARG;
393 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
394 default: return REG_ASSERT;
395 }
396 }
397
398 /* End of pcreposix.c */

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