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Revision 461 - (show annotations) (download)
Mon Oct 5 10:59:35 2009 UTC (4 years, 10 months ago) by ph10
File MIME type: text/plain
File size: 13823 byte(s)
Tidy up, remove trailing spaces, etc. for 8.00-RC1.

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, /* (*VERB) with an argument is not supported */
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 };
148
149 /* Table of texts corresponding to POSIX error codes */
150
151 static const char *const pstring[] = {
152 "", /* Dummy for value 0 */
153 "internal error", /* REG_ASSERT */
154 "invalid repeat counts in {}", /* BADBR */
155 "pattern error", /* BADPAT */
156 "? * + invalid", /* BADRPT */
157 "unbalanced {}", /* EBRACE */
158 "unbalanced []", /* EBRACK */
159 "collation error - not relevant", /* ECOLLATE */
160 "bad class", /* ECTYPE */
161 "bad escape sequence", /* EESCAPE */
162 "empty expression", /* EMPTY */
163 "unbalanced ()", /* EPAREN */
164 "bad range inside []", /* ERANGE */
165 "expression too big", /* ESIZE */
166 "failed to get memory", /* ESPACE */
167 "bad back reference", /* ESUBREG */
168 "bad argument", /* INVARG */
169 "match failed" /* NOMATCH */
170 };
171
172
173
174
175 /*************************************************
176 * Translate error code to string *
177 *************************************************/
178
179 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
180 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
181 {
182 const char *message, *addmessage;
183 size_t length, addlength;
184
185 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
186 "unknown error code" : pstring[errcode];
187 length = strlen(message) + 1;
188
189 addmessage = " at offset ";
190 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
191 strlen(addmessage) + 6 : 0;
192
193 if (errbuf_size > 0)
194 {
195 if (addlength > 0 && errbuf_size >= length + addlength)
196 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
197 else
198 {
199 strncpy(errbuf, message, errbuf_size - 1);
200 errbuf[errbuf_size-1] = 0;
201 }
202 }
203
204 return length + addlength;
205 }
206
207
208
209
210 /*************************************************
211 * Free store held by a regex *
212 *************************************************/
213
214 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
215 regfree(regex_t *preg)
216 {
217 (pcre_free)(preg->re_pcre);
218 }
219
220
221
222
223 /*************************************************
224 * Compile a regular expression *
225 *************************************************/
226
227 /*
228 Arguments:
229 preg points to a structure for recording the compiled expression
230 pattern the pattern to compile
231 cflags compilation flags
232
233 Returns: 0 on success
234 various non-zero codes on failure
235 */
236
237 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
238 regcomp(regex_t *preg, const char *pattern, int cflags)
239 {
240 const char *errorptr;
241 int erroffset;
242 int errorcode;
243 int options = 0;
244
245 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
246 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
247 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
248 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
249 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
250 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
251
252 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
253 &erroffset, NULL);
254 preg->re_erroffset = erroffset;
255
256 /* Safety: if the error code is too big for the translation vector (which
257 should not happen, but we all make mistakes), return REG_BADPAT. */
258
259 if (preg->re_pcre == NULL)
260 {
261 return (errorcode < sizeof(eint)/sizeof(const int))?
262 eint[errorcode] : REG_BADPAT;
263 }
264
265 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
266 return 0;
267 }
268
269
270
271
272 /*************************************************
273 * Match a regular expression *
274 *************************************************/
275
276 /* Unfortunately, PCRE requires 3 ints of working space for each captured
277 substring, so we have to get and release working store instead of just using
278 the POSIX structures as was done in earlier releases when PCRE needed only 2
279 ints. However, if the number of possible capturing brackets is small, use a
280 block of store on the stack, to reduce the use of malloc/free. The threshold is
281 in a macro that can be changed at configure time.
282
283 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
284 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
285 the only result is yes/no/error. */
286
287 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
288 regexec(const regex_t *preg, const char *string, size_t nmatch,
289 regmatch_t pmatch[], int eflags)
290 {
291 int rc, so, eo;
292 int options = 0;
293 int *ovector = NULL;
294 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
295 BOOL allocated_ovector = FALSE;
296 BOOL nosub =
297 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
298
299 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
300 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
301 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
302
303 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
304
305 /* When no string data is being returned, or no vector has been passed in which
306 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
307 the return data is large enough. */
308
309 if (nosub || pmatch == NULL) nmatch = 0;
310
311 else if (nmatch > 0)
312 {
313 if (nmatch <= POSIX_MALLOC_THRESHOLD)
314 {
315 ovector = &(small_ovector[0]);
316 }
317 else
318 {
319 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
320 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
321 if (ovector == NULL) return REG_ESPACE;
322 allocated_ovector = TRUE;
323 }
324 }
325
326 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
327 The man page from OS X says "REG_STARTEND affects only the location of the
328 string, not how it is matched". That is why the "so" value is used to bump the
329 start location rather than being passed as a PCRE "starting offset". */
330
331 if ((eflags & REG_STARTEND) != 0)
332 {
333 so = pmatch[0].rm_so;
334 eo = pmatch[0].rm_eo;
335 }
336 else
337 {
338 so = 0;
339 eo = strlen(string);
340 }
341
342 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
343 0, options, ovector, nmatch * 3);
344
345 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
346
347 if (rc >= 0)
348 {
349 size_t i;
350 if (!nosub)
351 {
352 for (i = 0; i < (size_t)rc; i++)
353 {
354 pmatch[i].rm_so = ovector[i*2];
355 pmatch[i].rm_eo = ovector[i*2+1];
356 }
357 if (allocated_ovector) free(ovector);
358 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
359 }
360 return 0;
361 }
362
363 else
364 {
365 if (allocated_ovector) free(ovector);
366 switch(rc)
367 {
368 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
369 case PCRE_ERROR_NULL: return REG_INVARG;
370 case PCRE_ERROR_BADOPTION: return REG_INVARG;
371 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
372 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
373 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
374 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
375 case PCRE_ERROR_BADUTF8: return REG_INVARG;
376 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
377 default: return REG_ASSERT;
378 }
379 }
380 }
381
382 /* End of pcreposix.c */

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