/[pcre]/code/trunk/pcreposix.c
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Contents of /code/trunk/pcreposix.c

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Revision 286 - (show annotations) (download)
Mon Dec 17 14:46:11 2007 UTC (6 years, 10 months ago) by ph10
File MIME type: text/plain
File size: 12473 byte(s)
Add .gz and .bz2 optional support to pcregrep.

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 REG_BADPAT, /* subpattern name expected */
129 REG_BADPAT /* digit expected after (?+ */
130 };
131
132 /* Table of texts corresponding to POSIX error codes */
133
134 static const char *const pstring[] = {
135 "", /* Dummy for value 0 */
136 "internal error", /* REG_ASSERT */
137 "invalid repeat counts in {}", /* BADBR */
138 "pattern error", /* BADPAT */
139 "? * + invalid", /* BADRPT */
140 "unbalanced {}", /* EBRACE */
141 "unbalanced []", /* EBRACK */
142 "collation error - not relevant", /* ECOLLATE */
143 "bad class", /* ECTYPE */
144 "bad escape sequence", /* EESCAPE */
145 "empty expression", /* EMPTY */
146 "unbalanced ()", /* EPAREN */
147 "bad range inside []", /* ERANGE */
148 "expression too big", /* ESIZE */
149 "failed to get memory", /* ESPACE */
150 "bad back reference", /* ESUBREG */
151 "bad argument", /* INVARG */
152 "match failed" /* NOMATCH */
153 };
154
155
156
157
158 /*************************************************
159 * Translate error code to string *
160 *************************************************/
161
162 PCREPOSIX_EXP_DEFN size_t
163 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
164 {
165 const char *message, *addmessage;
166 size_t length, addlength;
167
168 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
169 "unknown error code" : pstring[errcode];
170 length = strlen(message) + 1;
171
172 addmessage = " at offset ";
173 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
174 strlen(addmessage) + 6 : 0;
175
176 if (errbuf_size > 0)
177 {
178 if (addlength > 0 && errbuf_size >= length + addlength)
179 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
180 else
181 {
182 strncpy(errbuf, message, errbuf_size - 1);
183 errbuf[errbuf_size-1] = 0;
184 }
185 }
186
187 return length + addlength;
188 }
189
190
191
192
193 /*************************************************
194 * Free store held by a regex *
195 *************************************************/
196
197 PCREPOSIX_EXP_DEFN void
198 regfree(regex_t *preg)
199 {
200 (pcre_free)(preg->re_pcre);
201 }
202
203
204
205
206 /*************************************************
207 * Compile a regular expression *
208 *************************************************/
209
210 /*
211 Arguments:
212 preg points to a structure for recording the compiled expression
213 pattern the pattern to compile
214 cflags compilation flags
215
216 Returns: 0 on success
217 various non-zero codes on failure
218 */
219
220 PCREPOSIX_EXP_DEFN int
221 regcomp(regex_t *preg, const char *pattern, int cflags)
222 {
223 const char *errorptr;
224 int erroffset;
225 int errorcode;
226 int options = 0;
227
228 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
229 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
230 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
231 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
232 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
233
234 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
235 &erroffset, NULL);
236 preg->re_erroffset = erroffset;
237
238 if (preg->re_pcre == NULL) return eint[errorcode];
239
240 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
241 return 0;
242 }
243
244
245
246
247 /*************************************************
248 * Match a regular expression *
249 *************************************************/
250
251 /* Unfortunately, PCRE requires 3 ints of working space for each captured
252 substring, so we have to get and release working store instead of just using
253 the POSIX structures as was done in earlier releases when PCRE needed only 2
254 ints. However, if the number of possible capturing brackets is small, use a
255 block of store on the stack, to reduce the use of malloc/free. The threshold is
256 in a macro that can be changed at configure time.
257
258 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
259 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
260 the only result is yes/no/error. */
261
262 PCREPOSIX_EXP_DEFN int
263 regexec(const regex_t *preg, const char *string, size_t nmatch,
264 regmatch_t pmatch[], int eflags)
265 {
266 int rc;
267 int options = 0;
268 int *ovector = NULL;
269 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
270 BOOL allocated_ovector = FALSE;
271 BOOL nosub =
272 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
273
274 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
275 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
276
277 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
278
279 /* When no string data is being returned, ensure that nmatch is zero.
280 Otherwise, ensure the vector for holding the return data is large enough. */
281
282 if (nosub) nmatch = 0;
283
284 else if (nmatch > 0)
285 {
286 if (nmatch <= POSIX_MALLOC_THRESHOLD)
287 {
288 ovector = &(small_ovector[0]);
289 }
290 else
291 {
292 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
293 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
294 if (ovector == NULL) return REG_ESPACE;
295 allocated_ovector = TRUE;
296 }
297 }
298
299 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
300 0, options, ovector, nmatch * 3);
301
302 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
303
304 if (rc >= 0)
305 {
306 size_t i;
307 if (!nosub)
308 {
309 for (i = 0; i < (size_t)rc; i++)
310 {
311 pmatch[i].rm_so = ovector[i*2];
312 pmatch[i].rm_eo = ovector[i*2+1];
313 }
314 if (allocated_ovector) free(ovector);
315 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
316 }
317 return 0;
318 }
319
320 else
321 {
322 if (allocated_ovector) free(ovector);
323 switch(rc)
324 {
325 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
326 case PCRE_ERROR_NULL: return REG_INVARG;
327 case PCRE_ERROR_BADOPTION: return REG_INVARG;
328 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
329 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
330 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
331 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
332 case PCRE_ERROR_BADUTF8: return REG_INVARG;
333 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
334 default: return REG_ASSERT;
335 }
336 }
337 }
338
339 /* End of pcreposix.c */

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