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Contents of /code/branches/oldtrunk8/pcreposix.c

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Revision 834 - (show annotations) (download)
Wed Dec 28 15:53:12 2011 UTC (2 years, 10 months ago) by ph10
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Make a copy of the 8-bit trunk in preparation for replacing it with the
8/16-bit branch. 

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) 1997-2010 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 /* We include pcre.h before pcre_internal.h so that the PCRE library functions
61 are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
62 This is needed even though pcre_internal.h itself includes pcre.h, because it
63 does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
64
65 #include "pcre.h"
66 #include "pcre_internal.h"
67 #include "pcreposix.h"
68
69
70 /* Table to translate PCRE compile time error codes into POSIX error codes. */
71
72 static const int eint[] = {
73 0, /* no error */
74 REG_EESCAPE, /* \ at end of pattern */
75 REG_EESCAPE, /* \c at end of pattern */
76 REG_EESCAPE, /* unrecognized character follows \ */
77 REG_BADBR, /* numbers out of order in {} quantifier */
78 /* 5 */
79 REG_BADBR, /* number too big in {} quantifier */
80 REG_EBRACK, /* missing terminating ] for character class */
81 REG_ECTYPE, /* invalid escape sequence in character class */
82 REG_ERANGE, /* range out of order in character class */
83 REG_BADRPT, /* nothing to repeat */
84 /* 10 */
85 REG_BADRPT, /* operand of unlimited repeat could match the empty string */
86 REG_ASSERT, /* internal error: unexpected repeat */
87 REG_BADPAT, /* unrecognized character after (? */
88 REG_BADPAT, /* POSIX named classes are supported only within a class */
89 REG_EPAREN, /* missing ) */
90 /* 15 */
91 REG_ESUBREG, /* reference to non-existent subpattern */
92 REG_INVARG, /* erroffset passed as NULL */
93 REG_INVARG, /* unknown option bit(s) set */
94 REG_EPAREN, /* missing ) after comment */
95 REG_ESIZE, /* parentheses nested too deeply */
96 /* 20 */
97 REG_ESIZE, /* regular expression too large */
98 REG_ESPACE, /* failed to get memory */
99 REG_EPAREN, /* unmatched parentheses */
100 REG_ASSERT, /* internal error: code overflow */
101 REG_BADPAT, /* unrecognized character after (?< */
102 /* 25 */
103 REG_BADPAT, /* lookbehind assertion is not fixed length */
104 REG_BADPAT, /* malformed number or name after (?( */
105 REG_BADPAT, /* conditional group contains more than two branches */
106 REG_BADPAT, /* assertion expected after (?( */
107 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
108 /* 30 */
109 REG_ECTYPE, /* unknown POSIX class name */
110 REG_BADPAT, /* POSIX collating elements are not supported */
111 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
112 REG_BADPAT, /* spare error */
113 REG_BADPAT, /* character value in \x{...} sequence is too large */
114 /* 35 */
115 REG_BADPAT, /* invalid condition (?(0) */
116 REG_BADPAT, /* \C not allowed in lookbehind assertion */
117 REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
118 REG_BADPAT, /* number after (?C is > 255 */
119 REG_BADPAT, /* closing ) for (?C expected */
120 /* 40 */
121 REG_BADPAT, /* recursive call could loop indefinitely */
122 REG_BADPAT, /* unrecognized character after (?P */
123 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
124 REG_BADPAT, /* two named subpatterns have the same name */
125 REG_BADPAT, /* invalid UTF-8 string */
126 /* 45 */
127 REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
128 REG_BADPAT, /* malformed \P or \p sequence */
129 REG_BADPAT, /* unknown property name after \P or \p */
130 REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
131 REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
132 /* 50 */
133 REG_BADPAT, /* repeated subpattern is too long */
134 REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
135 REG_BADPAT, /* internal error: overran compiling workspace */
136 REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
137 REG_BADPAT, /* DEFINE group contains more than one branch */
138 /* 55 */
139 REG_BADPAT, /* repeating a DEFINE group is not allowed */
140 REG_INVARG, /* inconsistent NEWLINE options */
141 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
142 REG_BADPAT, /* a numbered reference must not be zero */
143 REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
144 /* 60 */
145 REG_BADPAT, /* (*VERB) not recognized */
146 REG_BADPAT, /* number is too big */
147 REG_BADPAT, /* subpattern name expected */
148 REG_BADPAT, /* digit expected after (?+ */
149 REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
150 /* 65 */
151 REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
152 REG_BADPAT, /* (*MARK) must have an argument */
153 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UCP support */
154 REG_BADPAT, /* \c must be followed by an ASCII character */
155 REG_BADPAT, /* \k is not followed by a braced, angle-bracketed, or quoted name */
156 /* 70 */
157 REG_BADPAT, /* internal error: unknown opcode in find_fixedlength() */
158 REG_BADPAT, /* \N is not supported in a class */
159 REG_BADPAT, /* too many forward references */
160 };
161
162 /* Table of texts corresponding to POSIX error codes */
163
164 static const char *const pstring[] = {
165 "", /* Dummy for value 0 */
166 "internal error", /* REG_ASSERT */
167 "invalid repeat counts in {}", /* BADBR */
168 "pattern error", /* BADPAT */
169 "? * + invalid", /* BADRPT */
170 "unbalanced {}", /* EBRACE */
171 "unbalanced []", /* EBRACK */
172 "collation error - not relevant", /* ECOLLATE */
173 "bad class", /* ECTYPE */
174 "bad escape sequence", /* EESCAPE */
175 "empty expression", /* EMPTY */
176 "unbalanced ()", /* EPAREN */
177 "bad range inside []", /* ERANGE */
178 "expression too big", /* ESIZE */
179 "failed to get memory", /* ESPACE */
180 "bad back reference", /* ESUBREG */
181 "bad argument", /* INVARG */
182 "match failed" /* NOMATCH */
183 };
184
185
186
187
188 /*************************************************
189 * Translate error code to string *
190 *************************************************/
191
192 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
193 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
194 {
195 const char *message, *addmessage;
196 size_t length, addlength;
197
198 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
199 "unknown error code" : pstring[errcode];
200 length = strlen(message) + 1;
201
202 addmessage = " at offset ";
203 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
204 strlen(addmessage) + 6 : 0;
205
206 if (errbuf_size > 0)
207 {
208 if (addlength > 0 && errbuf_size >= length + addlength)
209 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
210 else
211 {
212 strncpy(errbuf, message, errbuf_size - 1);
213 errbuf[errbuf_size-1] = 0;
214 }
215 }
216
217 return length + addlength;
218 }
219
220
221
222
223 /*************************************************
224 * Free store held by a regex *
225 *************************************************/
226
227 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
228 regfree(regex_t *preg)
229 {
230 (pcre_free)(preg->re_pcre);
231 }
232
233
234
235
236 /*************************************************
237 * Compile a regular expression *
238 *************************************************/
239
240 /*
241 Arguments:
242 preg points to a structure for recording the compiled expression
243 pattern the pattern to compile
244 cflags compilation flags
245
246 Returns: 0 on success
247 various non-zero codes on failure
248 */
249
250 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
251 regcomp(regex_t *preg, const char *pattern, int cflags)
252 {
253 const char *errorptr;
254 int erroffset;
255 int errorcode;
256 int options = 0;
257
258 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
259 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
260 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
261 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
262 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
263 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
264 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
265
266 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
267 &erroffset, NULL);
268 preg->re_erroffset = erroffset;
269
270 /* Safety: if the error code is too big for the translation vector (which
271 should not happen, but we all make mistakes), return REG_BADPAT. */
272
273 if (preg->re_pcre == NULL)
274 {
275 return (errorcode < sizeof(eint)/sizeof(const int))?
276 eint[errorcode] : REG_BADPAT;
277 }
278
279 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
280 return 0;
281 }
282
283
284
285
286 /*************************************************
287 * Match a regular expression *
288 *************************************************/
289
290 /* Unfortunately, PCRE requires 3 ints of working space for each captured
291 substring, so we have to get and release working store instead of just using
292 the POSIX structures as was done in earlier releases when PCRE needed only 2
293 ints. However, if the number of possible capturing brackets is small, use a
294 block of store on the stack, to reduce the use of malloc/free. The threshold is
295 in a macro that can be changed at configure time.
296
297 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
298 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
299 the only result is yes/no/error. */
300
301 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
302 regexec(const regex_t *preg, const char *string, size_t nmatch,
303 regmatch_t pmatch[], int eflags)
304 {
305 int rc, so, eo;
306 int options = 0;
307 int *ovector = NULL;
308 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
309 BOOL allocated_ovector = FALSE;
310 BOOL nosub =
311 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
312
313 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
314 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
315 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
316
317 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
318
319 /* When no string data is being returned, or no vector has been passed in which
320 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
321 the return data is large enough. */
322
323 if (nosub || pmatch == NULL) nmatch = 0;
324
325 else if (nmatch > 0)
326 {
327 if (nmatch <= POSIX_MALLOC_THRESHOLD)
328 {
329 ovector = &(small_ovector[0]);
330 }
331 else
332 {
333 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
334 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
335 if (ovector == NULL) return REG_ESPACE;
336 allocated_ovector = TRUE;
337 }
338 }
339
340 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
341 The man page from OS X says "REG_STARTEND affects only the location of the
342 string, not how it is matched". That is why the "so" value is used to bump the
343 start location rather than being passed as a PCRE "starting offset". */
344
345 if ((eflags & REG_STARTEND) != 0)
346 {
347 so = pmatch[0].rm_so;
348 eo = pmatch[0].rm_eo;
349 }
350 else
351 {
352 so = 0;
353 eo = (int)strlen(string);
354 }
355
356 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
357 0, options, ovector, (int)(nmatch * 3));
358
359 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
360
361 /* Successful match */
362
363 if (rc >= 0)
364 {
365 size_t i;
366 if (!nosub)
367 {
368 for (i = 0; i < (size_t)rc; i++)
369 {
370 pmatch[i].rm_so = ovector[i*2];
371 pmatch[i].rm_eo = ovector[i*2+1];
372 }
373 if (allocated_ovector) free(ovector);
374 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
375 }
376 return 0;
377 }
378
379 /* Unsuccessful match */
380
381 if (allocated_ovector) free(ovector);
382 switch(rc)
383 {
384 /* ========================================================================== */
385 /* These cases are never obeyed. This is a fudge that causes a compile-time
386 error if the vector eint, which is indexed by compile-time error number, is
387 not the correct length. It seems to be the only way to do such a check at
388 compile time, as the sizeof() operator does not work in the C preprocessor.
389 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
390
391 case 0:
392 case (sizeof(eint)/sizeof(int) == ERRCOUNT):
393 return REG_ASSERT;
394 /* ========================================================================== */
395
396 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
397 case PCRE_ERROR_NULL: return REG_INVARG;
398 case PCRE_ERROR_BADOPTION: return REG_INVARG;
399 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
400 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
401 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
402 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
403 case PCRE_ERROR_BADUTF8: return REG_INVARG;
404 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
405 default: return REG_ASSERT;
406 }
407 }
408
409 /* End of pcreposix.c */

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