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Revision 536 - (show annotations) (download)
Mon Jun 7 16:39:32 2010 UTC (4 years, 3 months ago) by ph10
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File size: 14997 byte(s)
Reverse pcreposix.c #include patch; doesn't work on Windows.

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 /* We include pcre.h before pcre_internal.h so that the PCRE library functions
61 are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
62 This is needed even though pcre_internal.h itself includes pcre.h, because it
63 does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
64
65 #include "pcre.h"
66 #include "pcre_internal.h"
67 #include "pcreposix.h"
68
69
70 /* Table to translate PCRE compile time error codes into POSIX error codes. */
71
72 static const int eint[] = {
73 0, /* no error */
74 REG_EESCAPE, /* \ at end of pattern */
75 REG_EESCAPE, /* \c at end of pattern */
76 REG_EESCAPE, /* unrecognized character follows \ */
77 REG_BADBR, /* numbers out of order in {} quantifier */
78 /* 5 */
79 REG_BADBR, /* number too big in {} quantifier */
80 REG_EBRACK, /* missing terminating ] for character class */
81 REG_ECTYPE, /* invalid escape sequence in character class */
82 REG_ERANGE, /* range out of order in character class */
83 REG_BADRPT, /* nothing to repeat */
84 /* 10 */
85 REG_BADRPT, /* operand of unlimited repeat could match the empty string */
86 REG_ASSERT, /* internal error: unexpected repeat */
87 REG_BADPAT, /* unrecognized character after (? */
88 REG_BADPAT, /* POSIX named classes are supported only within a class */
89 REG_EPAREN, /* missing ) */
90 /* 15 */
91 REG_ESUBREG, /* reference to non-existent subpattern */
92 REG_INVARG, /* erroffset passed as NULL */
93 REG_INVARG, /* unknown option bit(s) set */
94 REG_EPAREN, /* missing ) after comment */
95 REG_ESIZE, /* parentheses nested too deeply */
96 /* 20 */
97 REG_ESIZE, /* regular expression too large */
98 REG_ESPACE, /* failed to get memory */
99 REG_EPAREN, /* unmatched parentheses */
100 REG_ASSERT, /* internal error: code overflow */
101 REG_BADPAT, /* unrecognized character after (?< */
102 /* 25 */
103 REG_BADPAT, /* lookbehind assertion is not fixed length */
104 REG_BADPAT, /* malformed number or name after (?( */
105 REG_BADPAT, /* conditional group contains more than two branches */
106 REG_BADPAT, /* assertion expected after (?( */
107 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
108 /* 30 */
109 REG_ECTYPE, /* unknown POSIX class name */
110 REG_BADPAT, /* POSIX collating elements are not supported */
111 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
112 REG_BADPAT, /* spare error */
113 REG_BADPAT, /* character value in \x{...} sequence is too large */
114 /* 35 */
115 REG_BADPAT, /* invalid condition (?(0) */
116 REG_BADPAT, /* \C not allowed in lookbehind assertion */
117 REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
118 REG_BADPAT, /* number after (?C is > 255 */
119 REG_BADPAT, /* closing ) for (?C expected */
120 /* 40 */
121 REG_BADPAT, /* recursive call could loop indefinitely */
122 REG_BADPAT, /* unrecognized character after (?P */
123 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
124 REG_BADPAT, /* two named subpatterns have the same name */
125 REG_BADPAT, /* invalid UTF-8 string */
126 /* 45 */
127 REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
128 REG_BADPAT, /* malformed \P or \p sequence */
129 REG_BADPAT, /* unknown property name after \P or \p */
130 REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
131 REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
132 /* 50 */
133 REG_BADPAT, /* repeated subpattern is too long */
134 REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
135 REG_BADPAT, /* internal error: overran compiling workspace */
136 REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
137 REG_BADPAT, /* DEFINE group contains more than one branch */
138 /* 55 */
139 REG_BADPAT, /* repeating a DEFINE group is not allowed */
140 REG_INVARG, /* inconsistent NEWLINE options */
141 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
142 REG_BADPAT, /* a numbered reference must not be zero */
143 REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
144 /* 60 */
145 REG_BADPAT, /* (*VERB) not recognized */
146 REG_BADPAT, /* number is too big */
147 REG_BADPAT, /* subpattern name expected */
148 REG_BADPAT, /* digit expected after (?+ */
149 REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
150 /* 65 */
151 REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
152 REG_BADPAT, /* (*MARK) must have an argument */
153 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UCP support */
154 };
155
156 /* Table of texts corresponding to POSIX error codes */
157
158 static const char *const pstring[] = {
159 "", /* Dummy for value 0 */
160 "internal error", /* REG_ASSERT */
161 "invalid repeat counts in {}", /* BADBR */
162 "pattern error", /* BADPAT */
163 "? * + invalid", /* BADRPT */
164 "unbalanced {}", /* EBRACE */
165 "unbalanced []", /* EBRACK */
166 "collation error - not relevant", /* ECOLLATE */
167 "bad class", /* ECTYPE */
168 "bad escape sequence", /* EESCAPE */
169 "empty expression", /* EMPTY */
170 "unbalanced ()", /* EPAREN */
171 "bad range inside []", /* ERANGE */
172 "expression too big", /* ESIZE */
173 "failed to get memory", /* ESPACE */
174 "bad back reference", /* ESUBREG */
175 "bad argument", /* INVARG */
176 "match failed" /* NOMATCH */
177 };
178
179
180
181
182 /*************************************************
183 * Translate error code to string *
184 *************************************************/
185
186 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
187 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
188 {
189 const char *message, *addmessage;
190 size_t length, addlength;
191
192 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
193 "unknown error code" : pstring[errcode];
194 length = strlen(message) + 1;
195
196 addmessage = " at offset ";
197 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
198 strlen(addmessage) + 6 : 0;
199
200 if (errbuf_size > 0)
201 {
202 if (addlength > 0 && errbuf_size >= length + addlength)
203 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
204 else
205 {
206 strncpy(errbuf, message, errbuf_size - 1);
207 errbuf[errbuf_size-1] = 0;
208 }
209 }
210
211 return length + addlength;
212 }
213
214
215
216
217 /*************************************************
218 * Free store held by a regex *
219 *************************************************/
220
221 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
222 regfree(regex_t *preg)
223 {
224 (pcre_free)(preg->re_pcre);
225 }
226
227
228
229
230 /*************************************************
231 * Compile a regular expression *
232 *************************************************/
233
234 /*
235 Arguments:
236 preg points to a structure for recording the compiled expression
237 pattern the pattern to compile
238 cflags compilation flags
239
240 Returns: 0 on success
241 various non-zero codes on failure
242 */
243
244 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
245 regcomp(regex_t *preg, const char *pattern, int cflags)
246 {
247 const char *errorptr;
248 int erroffset;
249 int errorcode;
250 int options = 0;
251
252 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
253 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
254 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
255 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
256 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
257 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
258 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
259
260 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
261 &erroffset, NULL);
262 preg->re_erroffset = erroffset;
263
264 /* Safety: if the error code is too big for the translation vector (which
265 should not happen, but we all make mistakes), return REG_BADPAT. */
266
267 if (preg->re_pcre == NULL)
268 {
269 return (errorcode < sizeof(eint)/sizeof(const int))?
270 eint[errorcode] : REG_BADPAT;
271 }
272
273 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
274 return 0;
275 }
276
277
278
279
280 /*************************************************
281 * Match a regular expression *
282 *************************************************/
283
284 /* Unfortunately, PCRE requires 3 ints of working space for each captured
285 substring, so we have to get and release working store instead of just using
286 the POSIX structures as was done in earlier releases when PCRE needed only 2
287 ints. However, if the number of possible capturing brackets is small, use a
288 block of store on the stack, to reduce the use of malloc/free. The threshold is
289 in a macro that can be changed at configure time.
290
291 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
292 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
293 the only result is yes/no/error. */
294
295 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
296 regexec(const regex_t *preg, const char *string, size_t nmatch,
297 regmatch_t pmatch[], int eflags)
298 {
299 int rc, so, eo;
300 int options = 0;
301 int *ovector = NULL;
302 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
303 BOOL allocated_ovector = FALSE;
304 BOOL nosub =
305 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
306
307 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
308 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
309 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
310
311 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
312
313 /* When no string data is being returned, or no vector has been passed in which
314 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
315 the return data is large enough. */
316
317 if (nosub || pmatch == NULL) nmatch = 0;
318
319 else if (nmatch > 0)
320 {
321 if (nmatch <= POSIX_MALLOC_THRESHOLD)
322 {
323 ovector = &(small_ovector[0]);
324 }
325 else
326 {
327 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
328 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
329 if (ovector == NULL) return REG_ESPACE;
330 allocated_ovector = TRUE;
331 }
332 }
333
334 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
335 The man page from OS X says "REG_STARTEND affects only the location of the
336 string, not how it is matched". That is why the "so" value is used to bump the
337 start location rather than being passed as a PCRE "starting offset". */
338
339 if ((eflags & REG_STARTEND) != 0)
340 {
341 so = pmatch[0].rm_so;
342 eo = pmatch[0].rm_eo;
343 }
344 else
345 {
346 so = 0;
347 eo = (int)strlen(string);
348 }
349
350 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
351 0, options, ovector, (int)(nmatch * 3));
352
353 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
354
355 /* Successful match */
356
357 if (rc >= 0)
358 {
359 size_t i;
360 if (!nosub)
361 {
362 for (i = 0; i < (size_t)rc; i++)
363 {
364 pmatch[i].rm_so = ovector[i*2];
365 pmatch[i].rm_eo = ovector[i*2+1];
366 }
367 if (allocated_ovector) free(ovector);
368 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
369 }
370 return 0;
371 }
372
373 /* Unsuccessful match */
374
375 if (allocated_ovector) free(ovector);
376 switch(rc)
377 {
378 /* ========================================================================== */
379 /* These cases are never obeyed. This is a fudge that causes a compile-time
380 error if the vector eint, which is indexed by compile-time error number, is
381 not the correct length. It seems to be the only way to do such a check at
382 compile time, as the sizeof() operator does not work in the C preprocessor.
383 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
384
385 case 0:
386 case (sizeof(eint)/sizeof(int) == ERRCOUNT):
387 return REG_ASSERT;
388 /* ========================================================================== */
389
390 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
391 case PCRE_ERROR_NULL: return REG_INVARG;
392 case PCRE_ERROR_BADOPTION: return REG_INVARG;
393 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
394 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
395 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
396 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
397 case PCRE_ERROR_BADUTF8: return REG_INVARG;
398 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
399 default: return REG_ASSERT;
400 }
401 }
402
403 /* End of pcreposix.c */

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