/[pcre]/code/tags/pcre-8.11/pcreposix.c
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Contents of /code/tags/pcre-8.11/pcreposix.c

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Revision 582 - (show annotations) (download)
Fri Dec 10 11:41:01 2010 UTC (3 years, 4 months ago) by ph10
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Tag 8.11 release.

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 REG_BADPAT, /* \c must be followed by an ASCII character */
155 };
156
157 /* Table of texts corresponding to POSIX error codes */
158
159 static const char *const pstring[] = {
160 "", /* Dummy for value 0 */
161 "internal error", /* REG_ASSERT */
162 "invalid repeat counts in {}", /* BADBR */
163 "pattern error", /* BADPAT */
164 "? * + invalid", /* BADRPT */
165 "unbalanced {}", /* EBRACE */
166 "unbalanced []", /* EBRACK */
167 "collation error - not relevant", /* ECOLLATE */
168 "bad class", /* ECTYPE */
169 "bad escape sequence", /* EESCAPE */
170 "empty expression", /* EMPTY */
171 "unbalanced ()", /* EPAREN */
172 "bad range inside []", /* ERANGE */
173 "expression too big", /* ESIZE */
174 "failed to get memory", /* ESPACE */
175 "bad back reference", /* ESUBREG */
176 "bad argument", /* INVARG */
177 "match failed" /* NOMATCH */
178 };
179
180
181
182
183 /*************************************************
184 * Translate error code to string *
185 *************************************************/
186
187 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
188 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
189 {
190 const char *message, *addmessage;
191 size_t length, addlength;
192
193 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
194 "unknown error code" : pstring[errcode];
195 length = strlen(message) + 1;
196
197 addmessage = " at offset ";
198 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
199 strlen(addmessage) + 6 : 0;
200
201 if (errbuf_size > 0)
202 {
203 if (addlength > 0 && errbuf_size >= length + addlength)
204 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
205 else
206 {
207 strncpy(errbuf, message, errbuf_size - 1);
208 errbuf[errbuf_size-1] = 0;
209 }
210 }
211
212 return length + addlength;
213 }
214
215
216
217
218 /*************************************************
219 * Free store held by a regex *
220 *************************************************/
221
222 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
223 regfree(regex_t *preg)
224 {
225 (pcre_free)(preg->re_pcre);
226 }
227
228
229
230
231 /*************************************************
232 * Compile a regular expression *
233 *************************************************/
234
235 /*
236 Arguments:
237 preg points to a structure for recording the compiled expression
238 pattern the pattern to compile
239 cflags compilation flags
240
241 Returns: 0 on success
242 various non-zero codes on failure
243 */
244
245 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
246 regcomp(regex_t *preg, const char *pattern, int cflags)
247 {
248 const char *errorptr;
249 int erroffset;
250 int errorcode;
251 int options = 0;
252
253 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
254 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
255 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
256 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
257 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
258 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
259 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
260
261 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
262 &erroffset, NULL);
263 preg->re_erroffset = erroffset;
264
265 /* Safety: if the error code is too big for the translation vector (which
266 should not happen, but we all make mistakes), return REG_BADPAT. */
267
268 if (preg->re_pcre == NULL)
269 {
270 return (errorcode < sizeof(eint)/sizeof(const int))?
271 eint[errorcode] : REG_BADPAT;
272 }
273
274 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
275 return 0;
276 }
277
278
279
280
281 /*************************************************
282 * Match a regular expression *
283 *************************************************/
284
285 /* Unfortunately, PCRE requires 3 ints of working space for each captured
286 substring, so we have to get and release working store instead of just using
287 the POSIX structures as was done in earlier releases when PCRE needed only 2
288 ints. However, if the number of possible capturing brackets is small, use a
289 block of store on the stack, to reduce the use of malloc/free. The threshold is
290 in a macro that can be changed at configure time.
291
292 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
293 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
294 the only result is yes/no/error. */
295
296 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
297 regexec(const regex_t *preg, const char *string, size_t nmatch,
298 regmatch_t pmatch[], int eflags)
299 {
300 int rc, so, eo;
301 int options = 0;
302 int *ovector = NULL;
303 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
304 BOOL allocated_ovector = FALSE;
305 BOOL nosub =
306 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
307
308 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
309 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
310 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
311
312 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
313
314 /* When no string data is being returned, or no vector has been passed in which
315 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
316 the return data is large enough. */
317
318 if (nosub || pmatch == NULL) nmatch = 0;
319
320 else if (nmatch > 0)
321 {
322 if (nmatch <= POSIX_MALLOC_THRESHOLD)
323 {
324 ovector = &(small_ovector[0]);
325 }
326 else
327 {
328 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
329 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
330 if (ovector == NULL) return REG_ESPACE;
331 allocated_ovector = TRUE;
332 }
333 }
334
335 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
336 The man page from OS X says "REG_STARTEND affects only the location of the
337 string, not how it is matched". That is why the "so" value is used to bump the
338 start location rather than being passed as a PCRE "starting offset". */
339
340 if ((eflags & REG_STARTEND) != 0)
341 {
342 so = pmatch[0].rm_so;
343 eo = pmatch[0].rm_eo;
344 }
345 else
346 {
347 so = 0;
348 eo = (int)strlen(string);
349 }
350
351 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
352 0, options, ovector, (int)(nmatch * 3));
353
354 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
355
356 /* Successful match */
357
358 if (rc >= 0)
359 {
360 size_t i;
361 if (!nosub)
362 {
363 for (i = 0; i < (size_t)rc; i++)
364 {
365 pmatch[i].rm_so = ovector[i*2];
366 pmatch[i].rm_eo = ovector[i*2+1];
367 }
368 if (allocated_ovector) free(ovector);
369 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
370 }
371 return 0;
372 }
373
374 /* Unsuccessful match */
375
376 if (allocated_ovector) free(ovector);
377 switch(rc)
378 {
379 /* ========================================================================== */
380 /* These cases are never obeyed. This is a fudge that causes a compile-time
381 error if the vector eint, which is indexed by compile-time error number, is
382 not the correct length. It seems to be the only way to do such a check at
383 compile time, as the sizeof() operator does not work in the C preprocessor.
384 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
385
386 case 0:
387 case (sizeof(eint)/sizeof(int) == ERRCOUNT):
388 return REG_ASSERT;
389 /* ========================================================================== */
390
391 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
392 case PCRE_ERROR_NULL: return REG_INVARG;
393 case PCRE_ERROR_BADOPTION: return REG_INVARG;
394 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
395 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
396 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
397 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
398 case PCRE_ERROR_BADUTF8: return REG_INVARG;
399 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
400 default: return REG_ASSERT;
401 }
402 }
403
404 /* End of pcreposix.c */

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