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Revision 530 - (show annotations) (download)
Tue Jun 1 13:42:06 2010 UTC (4 years, 6 months ago) by ph10
File MIME type: text/plain
File size: 14663 byte(s)
Added a lot of (int) casts to avoid compiler warnings in systems where      
size_t is 64-bit.

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

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