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Contents of /code/trunk/pcreposix.c

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Revision 236 - (show annotations) (download)
Tue Sep 11 12:57:06 2007 UTC (6 years, 11 months ago) by ph10
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<config.h> => "config.h" and also some cases of <pcre.h>.

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) 1997-2007 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 };
129
130 /* Table of texts corresponding to POSIX error codes */
131
132 static const char *const pstring[] = {
133 "", /* Dummy for value 0 */
134 "internal error", /* REG_ASSERT */
135 "invalid repeat counts in {}", /* BADBR */
136 "pattern error", /* BADPAT */
137 "? * + invalid", /* BADRPT */
138 "unbalanced {}", /* EBRACE */
139 "unbalanced []", /* EBRACK */
140 "collation error - not relevant", /* ECOLLATE */
141 "bad class", /* ECTYPE */
142 "bad escape sequence", /* EESCAPE */
143 "empty expression", /* EMPTY */
144 "unbalanced ()", /* EPAREN */
145 "bad range inside []", /* ERANGE */
146 "expression too big", /* ESIZE */
147 "failed to get memory", /* ESPACE */
148 "bad back reference", /* ESUBREG */
149 "bad argument", /* INVARG */
150 "match failed" /* NOMATCH */
151 };
152
153
154
155
156 /*************************************************
157 * Translate error code to string *
158 *************************************************/
159
160 PCREPOSIX_EXP_DEFN size_t
161 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
162 {
163 const char *message, *addmessage;
164 size_t length, addlength;
165
166 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
167 "unknown error code" : pstring[errcode];
168 length = strlen(message) + 1;
169
170 addmessage = " at offset ";
171 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
172 strlen(addmessage) + 6 : 0;
173
174 if (errbuf_size > 0)
175 {
176 if (addlength > 0 && errbuf_size >= length + addlength)
177 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
178 else
179 {
180 strncpy(errbuf, message, errbuf_size - 1);
181 errbuf[errbuf_size-1] = 0;
182 }
183 }
184
185 return length + addlength;
186 }
187
188
189
190
191 /*************************************************
192 * Free store held by a regex *
193 *************************************************/
194
195 PCREPOSIX_EXP_DEFN void
196 regfree(regex_t *preg)
197 {
198 (pcre_free)(preg->re_pcre);
199 }
200
201
202
203
204 /*************************************************
205 * Compile a regular expression *
206 *************************************************/
207
208 /*
209 Arguments:
210 preg points to a structure for recording the compiled expression
211 pattern the pattern to compile
212 cflags compilation flags
213
214 Returns: 0 on success
215 various non-zero codes on failure
216 */
217
218 PCREPOSIX_EXP_DEFN int
219 regcomp(regex_t *preg, const char *pattern, int cflags)
220 {
221 const char *errorptr;
222 int erroffset;
223 int errorcode;
224 int options = 0;
225
226 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
227 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
228 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
229 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
230 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
231
232 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
233 &erroffset, NULL);
234 preg->re_erroffset = erroffset;
235
236 if (preg->re_pcre == NULL) return eint[errorcode];
237
238 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
239 return 0;
240 }
241
242
243
244
245 /*************************************************
246 * Match a regular expression *
247 *************************************************/
248
249 /* Unfortunately, PCRE requires 3 ints of working space for each captured
250 substring, so we have to get and release working store instead of just using
251 the POSIX structures as was done in earlier releases when PCRE needed only 2
252 ints. However, if the number of possible capturing brackets is small, use a
253 block of store on the stack, to reduce the use of malloc/free. The threshold is
254 in a macro that can be changed at configure time.
255
256 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
257 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
258 the only result is yes/no/error. */
259
260 PCREPOSIX_EXP_DEFN int
261 regexec(const regex_t *preg, const char *string, size_t nmatch,
262 regmatch_t pmatch[], int eflags)
263 {
264 int rc;
265 int options = 0;
266 int *ovector = NULL;
267 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
268 BOOL allocated_ovector = FALSE;
269 BOOL nosub =
270 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
271
272 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
273 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
274
275 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
276
277 /* When no string data is being returned, ensure that nmatch is zero.
278 Otherwise, ensure the vector for holding the return data is large enough. */
279
280 if (nosub) nmatch = 0;
281
282 else if (nmatch > 0)
283 {
284 if (nmatch <= POSIX_MALLOC_THRESHOLD)
285 {
286 ovector = &(small_ovector[0]);
287 }
288 else
289 {
290 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
291 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
292 if (ovector == NULL) return REG_ESPACE;
293 allocated_ovector = TRUE;
294 }
295 }
296
297 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
298 0, options, ovector, nmatch * 3);
299
300 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
301
302 if (rc >= 0)
303 {
304 size_t i;
305 if (!nosub)
306 {
307 for (i = 0; i < (size_t)rc; i++)
308 {
309 pmatch[i].rm_so = ovector[i*2];
310 pmatch[i].rm_eo = ovector[i*2+1];
311 }
312 if (allocated_ovector) free(ovector);
313 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
314 }
315 return 0;
316 }
317
318 else
319 {
320 if (allocated_ovector) free(ovector);
321 switch(rc)
322 {
323 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
324 case PCRE_ERROR_NULL: return REG_INVARG;
325 case PCRE_ERROR_BADOPTION: return REG_INVARG;
326 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
327 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
328 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
329 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
330 case PCRE_ERROR_BADUTF8: return REG_INVARG;
331 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
332 default: return REG_ASSERT;
333 }
334 }
335 }
336
337 /* End of pcreposix.c */

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