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Revision 336 - (show annotations) (download)
Sat Apr 12 15:59:03 2008 UTC (6 years, 3 months ago) by ph10
File MIME type: text/plain
File size: 13006 byte(s)
Added PCRE_JAVASCRIPT_COMPAT option.

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) 1997-2008 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 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 REG_BADRPT, /* operand of unlimited repeat could match the empty string */
79 REG_ASSERT, /* internal error: unexpected repeat */
80 REG_BADPAT, /* unrecognized character after (? */
81 REG_BADPAT, /* POSIX named classes are supported only within a class */
82 REG_EPAREN, /* missing ) */
83 REG_ESUBREG, /* reference to non-existent subpattern */
84 REG_INVARG, /* erroffset passed as NULL */
85 REG_INVARG, /* unknown option bit(s) set */
86 REG_EPAREN, /* missing ) after comment */
87 REG_ESIZE, /* parentheses nested too deeply */
88 REG_ESIZE, /* regular expression too large */
89 REG_ESPACE, /* failed to get memory */
90 REG_EPAREN, /* unmatched brackets */
91 REG_ASSERT, /* internal error: code overflow */
92 REG_BADPAT, /* unrecognized character after (?< */
93 REG_BADPAT, /* lookbehind assertion is not fixed length */
94 REG_BADPAT, /* malformed number or name after (?( */
95 REG_BADPAT, /* conditional group contains more than two branches */
96 REG_BADPAT, /* assertion expected after (?( */
97 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
98 REG_ECTYPE, /* unknown POSIX class name */
99 REG_BADPAT, /* POSIX collating elements are not supported */
100 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
101 REG_BADPAT, /* spare error */
102 REG_BADPAT, /* character value in \x{...} sequence is too large */
103 REG_BADPAT, /* invalid condition (?(0) */
104 REG_BADPAT, /* \C not allowed in lookbehind assertion */
105 REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
106 REG_BADPAT, /* number after (?C is > 255 */
107 REG_BADPAT, /* closing ) for (?C expected */
108 REG_BADPAT, /* recursive call could loop indefinitely */
109 REG_BADPAT, /* unrecognized character after (?P */
110 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
111 REG_BADPAT, /* two named subpatterns have the same name */
112 REG_BADPAT, /* invalid UTF-8 string */
113 REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
114 REG_BADPAT, /* malformed \P or \p sequence */
115 REG_BADPAT, /* unknown property name after \P or \p */
116 REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
117 REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
118 REG_BADPAT, /* repeated subpattern is too long */
119 REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
120 REG_BADPAT, /* internal error: overran compiling workspace */
121 REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
122 REG_BADPAT, /* DEFINE group contains more than one branch */
123 REG_BADPAT, /* repeating a DEFINE group is not allowed */
124 REG_INVARG, /* inconsistent NEWLINE options */
125 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
126 REG_BADPAT, /* (?+ or (?- must be followed by a non-zero number */
127 REG_BADPAT, /* number is too big */
128 REG_BADPAT, /* subpattern name expected */
129 REG_BADPAT, /* digit expected after (?+ */
130 REG_BADPAT /* ] is an invalid data character in JavaScript compatibility mode */
131 };
132
133 /* Table of texts corresponding to POSIX error codes */
134
135 static const char *const pstring[] = {
136 "", /* Dummy for value 0 */
137 "internal error", /* REG_ASSERT */
138 "invalid repeat counts in {}", /* BADBR */
139 "pattern error", /* BADPAT */
140 "? * + invalid", /* BADRPT */
141 "unbalanced {}", /* EBRACE */
142 "unbalanced []", /* EBRACK */
143 "collation error - not relevant", /* ECOLLATE */
144 "bad class", /* ECTYPE */
145 "bad escape sequence", /* EESCAPE */
146 "empty expression", /* EMPTY */
147 "unbalanced ()", /* EPAREN */
148 "bad range inside []", /* ERANGE */
149 "expression too big", /* ESIZE */
150 "failed to get memory", /* ESPACE */
151 "bad back reference", /* ESUBREG */
152 "bad argument", /* INVARG */
153 "match failed" /* NOMATCH */
154 };
155
156
157
158
159 /*************************************************
160 * Translate error code to string *
161 *************************************************/
162
163 PCREPOSIX_EXP_DEFN size_t
164 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
165 {
166 const char *message, *addmessage;
167 size_t length, addlength;
168
169 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
170 "unknown error code" : pstring[errcode];
171 length = strlen(message) + 1;
172
173 addmessage = " at offset ";
174 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
175 strlen(addmessage) + 6 : 0;
176
177 if (errbuf_size > 0)
178 {
179 if (addlength > 0 && errbuf_size >= length + addlength)
180 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
181 else
182 {
183 strncpy(errbuf, message, errbuf_size - 1);
184 errbuf[errbuf_size-1] = 0;
185 }
186 }
187
188 return length + addlength;
189 }
190
191
192
193
194 /*************************************************
195 * Free store held by a regex *
196 *************************************************/
197
198 PCREPOSIX_EXP_DEFN void
199 regfree(regex_t *preg)
200 {
201 (pcre_free)(preg->re_pcre);
202 }
203
204
205
206
207 /*************************************************
208 * Compile a regular expression *
209 *************************************************/
210
211 /*
212 Arguments:
213 preg points to a structure for recording the compiled expression
214 pattern the pattern to compile
215 cflags compilation flags
216
217 Returns: 0 on success
218 various non-zero codes on failure
219 */
220
221 PCREPOSIX_EXP_DEFN int
222 regcomp(regex_t *preg, const char *pattern, int cflags)
223 {
224 const char *errorptr;
225 int erroffset;
226 int errorcode;
227 int options = 0;
228
229 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
230 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
231 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
232 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
233 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
234
235 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
236 &erroffset, NULL);
237 preg->re_erroffset = erroffset;
238
239 if (preg->re_pcre == NULL) return eint[errorcode];
240
241 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
242 return 0;
243 }
244
245
246
247
248 /*************************************************
249 * Match a regular expression *
250 *************************************************/
251
252 /* Unfortunately, PCRE requires 3 ints of working space for each captured
253 substring, so we have to get and release working store instead of just using
254 the POSIX structures as was done in earlier releases when PCRE needed only 2
255 ints. However, if the number of possible capturing brackets is small, use a
256 block of store on the stack, to reduce the use of malloc/free. The threshold is
257 in a macro that can be changed at configure time.
258
259 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
260 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
261 the only result is yes/no/error. */
262
263 PCREPOSIX_EXP_DEFN int
264 regexec(const regex_t *preg, const char *string, size_t nmatch,
265 regmatch_t pmatch[], int eflags)
266 {
267 int rc, so, eo;
268 int options = 0;
269 int *ovector = NULL;
270 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
271 BOOL allocated_ovector = FALSE;
272 BOOL nosub =
273 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
274
275 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
276 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
277
278 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
279
280 /* When no string data is being returned, ensure that nmatch is zero.
281 Otherwise, ensure the vector for holding the return data is large enough. */
282
283 if (nosub) nmatch = 0;
284
285 else if (nmatch > 0)
286 {
287 if (nmatch <= POSIX_MALLOC_THRESHOLD)
288 {
289 ovector = &(small_ovector[0]);
290 }
291 else
292 {
293 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
294 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
295 if (ovector == NULL) return REG_ESPACE;
296 allocated_ovector = TRUE;
297 }
298 }
299
300 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
301 The man page from OS X says "REG_STARTEND affects only the location of the
302 string, not how it is matched". That is why the "so" value is used to bump the
303 start location rather than being passed as a PCRE "starting offset". */
304
305 if ((eflags & REG_STARTEND) != 0)
306 {
307 so = pmatch[0].rm_so;
308 eo = pmatch[0].rm_eo;
309 }
310 else
311 {
312 so = 0;
313 eo = strlen(string);
314 }
315
316 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
317 0, options, ovector, nmatch * 3);
318
319 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
320
321 if (rc >= 0)
322 {
323 size_t i;
324 if (!nosub)
325 {
326 for (i = 0; i < (size_t)rc; i++)
327 {
328 pmatch[i].rm_so = ovector[i*2];
329 pmatch[i].rm_eo = ovector[i*2+1];
330 }
331 if (allocated_ovector) free(ovector);
332 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
333 }
334 return 0;
335 }
336
337 else
338 {
339 if (allocated_ovector) free(ovector);
340 switch(rc)
341 {
342 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
343 case PCRE_ERROR_NULL: return REG_INVARG;
344 case PCRE_ERROR_BADOPTION: return REG_INVARG;
345 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
346 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
347 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
348 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
349 case PCRE_ERROR_BADUTF8: return REG_INVARG;
350 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
351 default: return REG_ASSERT;
352 }
353 }
354 }
355
356 /* End of pcreposix.c */

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