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Revision 1404 - (show annotations)
Tue Nov 19 15:36:57 2013 UTC (5 years, 10 months ago) by ph10
File MIME type: text/plain
File size: 16224 byte(s)
Source tidies for 8.34-RC1.
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) 1997-2012 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{} or \o{} 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 REG_BADPAT, /* disallowed UTF-8/16/32 code point (>= 0xd800 && <= 0xdfff) */
161 REG_BADPAT, /* invalid UTF-16 string (should not occur) */
162 /* 75 */
163 REG_BADPAT, /* overlong MARK name */
164 REG_BADPAT, /* character value in \u.... sequence is too large */
165 REG_BADPAT, /* invalid UTF-32 string (should not occur) */
166 REG_BADPAT, /* setting UTF is disabled by the application */
167 REG_BADPAT, /* non-hex character in \\x{} (closing brace missing?) */
168 /* 80 */
169 REG_BADPAT, /* non-octal character in \o{} (closing brace missing?) */
170 REG_BADPAT, /* missing opening brace after \o */
171 REG_BADPAT, /* parentheses too deeply nested */
172 REG_BADPAT, /* invalid range in character class */
173 REG_BADPAT /* group name must start with a non-digit */
174 };
175
176 /* Table of texts corresponding to POSIX error codes */
177
178 static const char *const pstring[] = {
179 "", /* Dummy for value 0 */
180 "internal error", /* REG_ASSERT */
181 "invalid repeat counts in {}", /* BADBR */
182 "pattern error", /* BADPAT */
183 "? * + invalid", /* BADRPT */
184 "unbalanced {}", /* EBRACE */
185 "unbalanced []", /* EBRACK */
186 "collation error - not relevant", /* ECOLLATE */
187 "bad class", /* ECTYPE */
188 "bad escape sequence", /* EESCAPE */
189 "empty expression", /* EMPTY */
190 "unbalanced ()", /* EPAREN */
191 "bad range inside []", /* ERANGE */
192 "expression too big", /* ESIZE */
193 "failed to get memory", /* ESPACE */
194 "bad back reference", /* ESUBREG */
195 "bad argument", /* INVARG */
196 "match failed" /* NOMATCH */
197 };
198
199
200
201
202 /*************************************************
203 * Translate error code to string *
204 *************************************************/
205
206 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
207 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
208 {
209 const char *message, *addmessage;
210 size_t length, addlength;
211
212 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
213 "unknown error code" : pstring[errcode];
214 length = strlen(message) + 1;
215
216 addmessage = " at offset ";
217 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
218 strlen(addmessage) + 6 : 0;
219
220 if (errbuf_size > 0)
221 {
222 if (addlength > 0 && errbuf_size >= length + addlength)
223 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
224 else
225 {
226 strncpy(errbuf, message, errbuf_size - 1);
227 errbuf[errbuf_size-1] = 0;
228 }
229 }
230
231 return length + addlength;
232 }
233
234
235
236
237 /*************************************************
238 * Free store held by a regex *
239 *************************************************/
240
241 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
242 regfree(regex_t *preg)
243 {
244 (PUBL(free))(preg->re_pcre);
245 }
246
247
248
249
250 /*************************************************
251 * Compile a regular expression *
252 *************************************************/
253
254 /*
255 Arguments:
256 preg points to a structure for recording the compiled expression
257 pattern the pattern to compile
258 cflags compilation flags
259
260 Returns: 0 on success
261 various non-zero codes on failure
262 */
263
264 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
265 regcomp(regex_t *preg, const char *pattern, int cflags)
266 {
267 const char *errorptr;
268 int erroffset;
269 int errorcode;
270 int options = 0;
271 int re_nsub = 0;
272
273 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
274 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
275 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
276 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
277 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
278 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
279 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
280
281 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
282 &erroffset, NULL);
283 preg->re_erroffset = erroffset;
284
285 /* Safety: if the error code is too big for the translation vector (which
286 should not happen, but we all make mistakes), return REG_BADPAT. */
287
288 if (preg->re_pcre == NULL)
289 {
290 return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
291 eint[errorcode] : REG_BADPAT;
292 }
293
294 (void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
295 &re_nsub);
296 preg->re_nsub = (size_t)re_nsub;
297 return 0;
298 }
299
300
301
302
303 /*************************************************
304 * Match a regular expression *
305 *************************************************/
306
307 /* Unfortunately, PCRE requires 3 ints of working space for each captured
308 substring, so we have to get and release working store instead of just using
309 the POSIX structures as was done in earlier releases when PCRE needed only 2
310 ints. However, if the number of possible capturing brackets is small, use a
311 block of store on the stack, to reduce the use of malloc/free. The threshold is
312 in a macro that can be changed at configure time.
313
314 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
315 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
316 the only result is yes/no/error. */
317
318 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
319 regexec(const regex_t *preg, const char *string, size_t nmatch,
320 regmatch_t pmatch[], int eflags)
321 {
322 int rc, so, eo;
323 int options = 0;
324 int *ovector = NULL;
325 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
326 BOOL allocated_ovector = FALSE;
327 BOOL nosub =
328 (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
329
330 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
331 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
332 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
333
334 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
335
336 /* When no string data is being returned, or no vector has been passed in which
337 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
338 the return data is large enough. */
339
340 if (nosub || pmatch == NULL) nmatch = 0;
341
342 else if (nmatch > 0)
343 {
344 if (nmatch <= POSIX_MALLOC_THRESHOLD)
345 {
346 ovector = &(small_ovector[0]);
347 }
348 else
349 {
350 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
351 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
352 if (ovector == NULL) return REG_ESPACE;
353 allocated_ovector = TRUE;
354 }
355 }
356
357 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
358 The man page from OS X says "REG_STARTEND affects only the location of the
359 string, not how it is matched". That is why the "so" value is used to bump the
360 start location rather than being passed as a PCRE "starting offset". */
361
362 if ((eflags & REG_STARTEND) != 0)
363 {
364 so = pmatch[0].rm_so;
365 eo = pmatch[0].rm_eo;
366 }
367 else
368 {
369 so = 0;
370 eo = (int)strlen(string);
371 }
372
373 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
374 0, options, ovector, (int)(nmatch * 3));
375
376 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
377
378 /* Successful match */
379
380 if (rc >= 0)
381 {
382 size_t i;
383 if (!nosub)
384 {
385 for (i = 0; i < (size_t)rc; i++)
386 {
387 pmatch[i].rm_so = ovector[i*2];
388 pmatch[i].rm_eo = ovector[i*2+1];
389 }
390 if (allocated_ovector) free(ovector);
391 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
392 }
393 return 0;
394 }
395
396 /* Unsuccessful match */
397
398 if (allocated_ovector) free(ovector);
399 switch(rc)
400 {
401 /* ========================================================================== */
402 /* These cases are never obeyed. This is a fudge that causes a compile-time
403 error if the vector eint, which is indexed by compile-time error number, is
404 not the correct length. It seems to be the only way to do such a check at
405 compile time, as the sizeof() operator does not work in the C preprocessor.
406 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
407
408 case 0:
409 case (sizeof(eint)/sizeof(int) == ERRCOUNT):
410 return REG_ASSERT;
411 /* ========================================================================== */
412
413 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
414 case PCRE_ERROR_NULL: return REG_INVARG;
415 case PCRE_ERROR_BADOPTION: return REG_INVARG;
416 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
417 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
418 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
419 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
420 case PCRE_ERROR_BADUTF8: return REG_INVARG;
421 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
422 case PCRE_ERROR_BADMODE: return REG_INVARG;
423 default: return REG_ASSERT;
424 }
425 }
426
427 /* End of pcreposix.c */

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