/[pcre]/code/trunk/pcreposix.c
ViewVC logotype

Contents of /code/trunk/pcreposix.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 418 - (show annotations) (download)
Fri Apr 24 09:17:18 2009 UTC (5 years ago) by ph10
File MIME type: text/plain
File size: 13607 byte(s)
Fix POSIX error code bug.

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 };
146
147 /* Table of texts corresponding to POSIX error codes */
148
149 static const char *const pstring[] = {
150 "", /* Dummy for value 0 */
151 "internal error", /* REG_ASSERT */
152 "invalid repeat counts in {}", /* BADBR */
153 "pattern error", /* BADPAT */
154 "? * + invalid", /* BADRPT */
155 "unbalanced {}", /* EBRACE */
156 "unbalanced []", /* EBRACK */
157 "collation error - not relevant", /* ECOLLATE */
158 "bad class", /* ECTYPE */
159 "bad escape sequence", /* EESCAPE */
160 "empty expression", /* EMPTY */
161 "unbalanced ()", /* EPAREN */
162 "bad range inside []", /* ERANGE */
163 "expression too big", /* ESIZE */
164 "failed to get memory", /* ESPACE */
165 "bad back reference", /* ESUBREG */
166 "bad argument", /* INVARG */
167 "match failed" /* NOMATCH */
168 };
169
170
171
172
173 /*************************************************
174 * Translate error code to string *
175 *************************************************/
176
177 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
178 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
179 {
180 const char *message, *addmessage;
181 size_t length, addlength;
182
183 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
184 "unknown error code" : pstring[errcode];
185 length = strlen(message) + 1;
186
187 addmessage = " at offset ";
188 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
189 strlen(addmessage) + 6 : 0;
190
191 if (errbuf_size > 0)
192 {
193 if (addlength > 0 && errbuf_size >= length + addlength)
194 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
195 else
196 {
197 strncpy(errbuf, message, errbuf_size - 1);
198 errbuf[errbuf_size-1] = 0;
199 }
200 }
201
202 return length + addlength;
203 }
204
205
206
207
208 /*************************************************
209 * Free store held by a regex *
210 *************************************************/
211
212 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
213 regfree(regex_t *preg)
214 {
215 (pcre_free)(preg->re_pcre);
216 }
217
218
219
220
221 /*************************************************
222 * Compile a regular expression *
223 *************************************************/
224
225 /*
226 Arguments:
227 preg points to a structure for recording the compiled expression
228 pattern the pattern to compile
229 cflags compilation flags
230
231 Returns: 0 on success
232 various non-zero codes on failure
233 */
234
235 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
236 regcomp(regex_t *preg, const char *pattern, int cflags)
237 {
238 const char *errorptr;
239 int erroffset;
240 int errorcode;
241 int options = 0;
242
243 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
244 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
245 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
246 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
247 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
248
249 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
250 &erroffset, NULL);
251 preg->re_erroffset = erroffset;
252
253 /* Safety: if the error code is too big for the translation vector (which
254 should not happen, but we all make mistakes), return REG_BADPAT. */
255
256 if (preg->re_pcre == NULL)
257 {
258 return (errorcode < sizeof(eint)/sizeof(const int))?
259 eint[errorcode] : REG_BADPAT;
260 }
261
262 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
263 return 0;
264 }
265
266
267
268
269 /*************************************************
270 * Match a regular expression *
271 *************************************************/
272
273 /* Unfortunately, PCRE requires 3 ints of working space for each captured
274 substring, so we have to get and release working store instead of just using
275 the POSIX structures as was done in earlier releases when PCRE needed only 2
276 ints. However, if the number of possible capturing brackets is small, use a
277 block of store on the stack, to reduce the use of malloc/free. The threshold is
278 in a macro that can be changed at configure time.
279
280 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
281 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
282 the only result is yes/no/error. */
283
284 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
285 regexec(const regex_t *preg, const char *string, size_t nmatch,
286 regmatch_t pmatch[], int eflags)
287 {
288 int rc, so, eo;
289 int options = 0;
290 int *ovector = NULL;
291 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
292 BOOL allocated_ovector = FALSE;
293 BOOL nosub =
294 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
295
296 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
297 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
298 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
299
300 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
301
302 /* When no string data is being returned, ensure that nmatch is zero.
303 Otherwise, ensure the vector for holding the return data is large enough. */
304
305 if (nosub) nmatch = 0;
306
307 else if (nmatch > 0)
308 {
309 if (nmatch <= POSIX_MALLOC_THRESHOLD)
310 {
311 ovector = &(small_ovector[0]);
312 }
313 else
314 {
315 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
316 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
317 if (ovector == NULL) return REG_ESPACE;
318 allocated_ovector = TRUE;
319 }
320 }
321
322 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
323 The man page from OS X says "REG_STARTEND affects only the location of the
324 string, not how it is matched". That is why the "so" value is used to bump the
325 start location rather than being passed as a PCRE "starting offset". */
326
327 if ((eflags & REG_STARTEND) != 0)
328 {
329 so = pmatch[0].rm_so;
330 eo = pmatch[0].rm_eo;
331 }
332 else
333 {
334 so = 0;
335 eo = strlen(string);
336 }
337
338 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
339 0, options, ovector, nmatch * 3);
340
341 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
342
343 if (rc >= 0)
344 {
345 size_t i;
346 if (!nosub)
347 {
348 for (i = 0; i < (size_t)rc; i++)
349 {
350 pmatch[i].rm_so = ovector[i*2];
351 pmatch[i].rm_eo = ovector[i*2+1];
352 }
353 if (allocated_ovector) free(ovector);
354 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
355 }
356 return 0;
357 }
358
359 else
360 {
361 if (allocated_ovector) free(ovector);
362 switch(rc)
363 {
364 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
365 case PCRE_ERROR_NULL: return REG_INVARG;
366 case PCRE_ERROR_BADOPTION: return REG_INVARG;
367 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
368 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
369 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
370 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
371 case PCRE_ERROR_BADUTF8: return REG_INVARG;
372 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
373 default: return REG_ASSERT;
374 }
375 }
376 }
377
378 /* End of pcreposix.c */

Properties

Name Value
svn:eol-style native
svn:keywords "Author Date Id Revision Url"

webmaster@exim.org
ViewVC Help
Powered by ViewVC 1.1.12