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Revision 199 - (show annotations)
Tue Jul 31 14:39:09 2007 UTC (7 years, 9 months ago) by ph10
File MIME type: text/plain
File size: 12414 byte(s)
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Daniel's patch for config.h and Windows DLL declarations (not fully working).
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_internal.h"
61 #include "pcreposix.h"
62
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 };
128
129 /* Table of texts corresponding to POSIX error codes */
130
131 static const char *const pstring[] = {
132 "", /* Dummy for value 0 */
133 "internal error", /* REG_ASSERT */
134 "invalid repeat counts in {}", /* BADBR */
135 "pattern error", /* BADPAT */
136 "? * + invalid", /* BADRPT */
137 "unbalanced {}", /* EBRACE */
138 "unbalanced []", /* EBRACK */
139 "collation error - not relevant", /* ECOLLATE */
140 "bad class", /* ECTYPE */
141 "bad escape sequence", /* EESCAPE */
142 "empty expression", /* EMPTY */
143 "unbalanced ()", /* EPAREN */
144 "bad range inside []", /* ERANGE */
145 "expression too big", /* ESIZE */
146 "failed to get memory", /* ESPACE */
147 "bad back reference", /* ESUBREG */
148 "bad argument", /* INVARG */
149 "match failed" /* NOMATCH */
150 };
151
152
153
154
155 /*************************************************
156 * Translate error code to string *
157 *************************************************/
158
159 PCREPOSIX_EXP_DEFN size_t
160 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
161 {
162 const char *message, *addmessage;
163 size_t length, addlength;
164
165 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
166 "unknown error code" : pstring[errcode];
167 length = strlen(message) + 1;
168
169 addmessage = " at offset ";
170 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
171 strlen(addmessage) + 6 : 0;
172
173 if (errbuf_size > 0)
174 {
175 if (addlength > 0 && errbuf_size >= length + addlength)
176 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
177 else
178 {
179 strncpy(errbuf, message, errbuf_size - 1);
180 errbuf[errbuf_size-1] = 0;
181 }
182 }
183
184 return length + addlength;
185 }
186
187
188
189
190 /*************************************************
191 * Free store held by a regex *
192 *************************************************/
193
194 PCREPOSIX_EXP_DEFN void
195 regfree(regex_t *preg)
196 {
197 (pcre_free)(preg->re_pcre);
198 }
199
200
201
202
203 /*************************************************
204 * Compile a regular expression *
205 *************************************************/
206
207 /*
208 Arguments:
209 preg points to a structure for recording the compiled expression
210 pattern the pattern to compile
211 cflags compilation flags
212
213 Returns: 0 on success
214 various non-zero codes on failure
215 */
216
217 PCREPOSIX_EXP_DEFN int
218 regcomp(regex_t *preg, const char *pattern, int cflags)
219 {
220 const char *errorptr;
221 int erroffset;
222 int errorcode;
223 int options = 0;
224
225 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
226 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
227 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
228 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
229 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
230
231 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
232 &erroffset, NULL);
233 preg->re_erroffset = erroffset;
234
235 if (preg->re_pcre == NULL) return eint[errorcode];
236
237 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
238 return 0;
239 }
240
241
242
243
244 /*************************************************
245 * Match a regular expression *
246 *************************************************/
247
248 /* Unfortunately, PCRE requires 3 ints of working space for each captured
249 substring, so we have to get and release working store instead of just using
250 the POSIX structures as was done in earlier releases when PCRE needed only 2
251 ints. However, if the number of possible capturing brackets is small, use a
252 block of store on the stack, to reduce the use of malloc/free. The threshold is
253 in a macro that can be changed at configure time.
254
255 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
256 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
257 the only result is yes/no/error. */
258
259 PCREPOSIX_EXP_DEFN int
260 regexec(const regex_t *preg, const char *string, size_t nmatch,
261 regmatch_t pmatch[], int eflags)
262 {
263 int rc;
264 int options = 0;
265 int *ovector = NULL;
266 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
267 BOOL allocated_ovector = FALSE;
268 BOOL nosub =
269 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
270
271 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
272 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
273
274 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
275
276 /* When no string data is being returned, ensure that nmatch is zero.
277 Otherwise, ensure the vector for holding the return data is large enough. */
278
279 if (nosub) nmatch = 0;
280
281 else if (nmatch > 0)
282 {
283 if (nmatch <= POSIX_MALLOC_THRESHOLD)
284 {
285 ovector = &(small_ovector[0]);
286 }
287 else
288 {
289 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
290 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
291 if (ovector == NULL) return REG_ESPACE;
292 allocated_ovector = TRUE;
293 }
294 }
295
296 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
297 0, options, ovector, nmatch * 3);
298
299 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
300
301 if (rc >= 0)
302 {
303 size_t i;
304 if (!nosub)
305 {
306 for (i = 0; i < (size_t)rc; i++)
307 {
308 pmatch[i].rm_so = ovector[i*2];
309 pmatch[i].rm_eo = ovector[i*2+1];
310 }
311 if (allocated_ovector) free(ovector);
312 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
313 }
314 return 0;
315 }
316
317 else
318 {
319 if (allocated_ovector) free(ovector);
320 switch(rc)
321 {
322 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
323 case PCRE_ERROR_NULL: return REG_INVARG;
324 case PCRE_ERROR_BADOPTION: return REG_INVARG;
325 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
326 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
327 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
328 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
329 case PCRE_ERROR_BADUTF8: return REG_INVARG;
330 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
331 default: return REG_ASSERT;
332 }
333 }
334 }
335
336 /* End of pcreposix.c */

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