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Contents of /code/branches/pcre16/pcreposix.c

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Revision 510 - (show annotations) (download)
Sat Mar 27 17:45:29 2010 UTC (4 years, 8 months ago) by ph10
Original Path: code/trunk/pcreposix.c
File MIME type: text/plain
File size: 14529 byte(s)
Add support for *MARK and names for *PRUNE, *SKIP, *THEN.

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) 1997-2009 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 };
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_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
252
253 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
254 &erroffset, NULL);
255 preg->re_erroffset = erroffset;
256
257 /* Safety: if the error code is too big for the translation vector (which
258 should not happen, but we all make mistakes), return REG_BADPAT. */
259
260 if (preg->re_pcre == NULL)
261 {
262 return (errorcode < sizeof(eint)/sizeof(const int))?
263 eint[errorcode] : REG_BADPAT;
264 }
265
266 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
267 return 0;
268 }
269
270
271
272
273 /*************************************************
274 * Match a regular expression *
275 *************************************************/
276
277 /* Unfortunately, PCRE requires 3 ints of working space for each captured
278 substring, so we have to get and release working store instead of just using
279 the POSIX structures as was done in earlier releases when PCRE needed only 2
280 ints. However, if the number of possible capturing brackets is small, use a
281 block of store on the stack, to reduce the use of malloc/free. The threshold is
282 in a macro that can be changed at configure time.
283
284 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
285 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
286 the only result is yes/no/error. */
287
288 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
289 regexec(const regex_t *preg, const char *string, size_t nmatch,
290 regmatch_t pmatch[], int eflags)
291 {
292 int rc, so, eo;
293 int options = 0;
294 int *ovector = NULL;
295 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
296 BOOL allocated_ovector = FALSE;
297 BOOL nosub =
298 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
299
300 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
301 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
302 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
303
304 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
305
306 /* When no string data is being returned, or no vector has been passed in which
307 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
308 the return data is large enough. */
309
310 if (nosub || pmatch == NULL) nmatch = 0;
311
312 else if (nmatch > 0)
313 {
314 if (nmatch <= POSIX_MALLOC_THRESHOLD)
315 {
316 ovector = &(small_ovector[0]);
317 }
318 else
319 {
320 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
321 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
322 if (ovector == NULL) return REG_ESPACE;
323 allocated_ovector = TRUE;
324 }
325 }
326
327 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
328 The man page from OS X says "REG_STARTEND affects only the location of the
329 string, not how it is matched". That is why the "so" value is used to bump the
330 start location rather than being passed as a PCRE "starting offset". */
331
332 if ((eflags & REG_STARTEND) != 0)
333 {
334 so = pmatch[0].rm_so;
335 eo = pmatch[0].rm_eo;
336 }
337 else
338 {
339 so = 0;
340 eo = strlen(string);
341 }
342
343 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
344 0, options, ovector, nmatch * 3);
345
346 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
347
348 /* Successful match */
349
350 if (rc >= 0)
351 {
352 size_t i;
353 if (!nosub)
354 {
355 for (i = 0; i < (size_t)rc; i++)
356 {
357 pmatch[i].rm_so = ovector[i*2];
358 pmatch[i].rm_eo = ovector[i*2+1];
359 }
360 if (allocated_ovector) free(ovector);
361 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
362 }
363 return 0;
364 }
365
366 /* Unsuccessful match */
367
368 if (allocated_ovector) free(ovector);
369 switch(rc)
370 {
371 /* ========================================================================== */
372 /* These cases are never obeyed. This is a fudge that causes a compile-time
373 error if the vector eint, which is indexed by compile-time error number, is
374 not the correct length. It seems to be the only way to do such a check at
375 compile time, as the sizeof() operator does not work in the C preprocessor.
376 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
377
378 case 0:
379 case (sizeof(eint)/sizeof(int) == ERRCOUNT):
380 return REG_ASSERT;
381 /* ========================================================================== */
382
383 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
384 case PCRE_ERROR_NULL: return REG_INVARG;
385 case PCRE_ERROR_BADOPTION: return REG_INVARG;
386 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
387 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
388 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
389 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
390 case PCRE_ERROR_BADUTF8: return REG_INVARG;
391 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
392 default: return REG_ASSERT;
393 }
394 }
395
396 /* End of pcreposix.c */

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