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Revision 1454 - (show annotations) (download)
Sun Feb 9 18:55:03 2014 UTC (2 months ago) by ph10
File MIME type: text/plain
File size: 16300 byte(s)
Implement pcre_stack_guard.

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) 1997-2014 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 /* 85 */
175 REG_BADPAT /* parentheses too deeply nested (stack check) */
176 };
177
178 /* Table of texts corresponding to POSIX error codes */
179
180 static const char *const pstring[] = {
181 "", /* Dummy for value 0 */
182 "internal error", /* REG_ASSERT */
183 "invalid repeat counts in {}", /* BADBR */
184 "pattern error", /* BADPAT */
185 "? * + invalid", /* BADRPT */
186 "unbalanced {}", /* EBRACE */
187 "unbalanced []", /* EBRACK */
188 "collation error - not relevant", /* ECOLLATE */
189 "bad class", /* ECTYPE */
190 "bad escape sequence", /* EESCAPE */
191 "empty expression", /* EMPTY */
192 "unbalanced ()", /* EPAREN */
193 "bad range inside []", /* ERANGE */
194 "expression too big", /* ESIZE */
195 "failed to get memory", /* ESPACE */
196 "bad back reference", /* ESUBREG */
197 "bad argument", /* INVARG */
198 "match failed" /* NOMATCH */
199 };
200
201
202
203
204 /*************************************************
205 * Translate error code to string *
206 *************************************************/
207
208 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
209 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
210 {
211 const char *message, *addmessage;
212 size_t length, addlength;
213
214 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
215 "unknown error code" : pstring[errcode];
216 length = strlen(message) + 1;
217
218 addmessage = " at offset ";
219 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
220 strlen(addmessage) + 6 : 0;
221
222 if (errbuf_size > 0)
223 {
224 if (addlength > 0 && errbuf_size >= length + addlength)
225 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
226 else
227 {
228 strncpy(errbuf, message, errbuf_size - 1);
229 errbuf[errbuf_size-1] = 0;
230 }
231 }
232
233 return length + addlength;
234 }
235
236
237
238
239 /*************************************************
240 * Free store held by a regex *
241 *************************************************/
242
243 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
244 regfree(regex_t *preg)
245 {
246 (PUBL(free))(preg->re_pcre);
247 }
248
249
250
251
252 /*************************************************
253 * Compile a regular expression *
254 *************************************************/
255
256 /*
257 Arguments:
258 preg points to a structure for recording the compiled expression
259 pattern the pattern to compile
260 cflags compilation flags
261
262 Returns: 0 on success
263 various non-zero codes on failure
264 */
265
266 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
267 regcomp(regex_t *preg, const char *pattern, int cflags)
268 {
269 const char *errorptr;
270 int erroffset;
271 int errorcode;
272 int options = 0;
273 int re_nsub = 0;
274
275 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
276 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
277 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
278 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
279 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
280 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
281 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
282
283 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
284 &erroffset, NULL);
285 preg->re_erroffset = erroffset;
286
287 /* Safety: if the error code is too big for the translation vector (which
288 should not happen, but we all make mistakes), return REG_BADPAT. */
289
290 if (preg->re_pcre == NULL)
291 {
292 return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
293 eint[errorcode] : REG_BADPAT;
294 }
295
296 (void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
297 &re_nsub);
298 preg->re_nsub = (size_t)re_nsub;
299 return 0;
300 }
301
302
303
304
305 /*************************************************
306 * Match a regular expression *
307 *************************************************/
308
309 /* Unfortunately, PCRE requires 3 ints of working space for each captured
310 substring, so we have to get and release working store instead of just using
311 the POSIX structures as was done in earlier releases when PCRE needed only 2
312 ints. However, if the number of possible capturing brackets is small, use a
313 block of store on the stack, to reduce the use of malloc/free. The threshold is
314 in a macro that can be changed at configure time.
315
316 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
317 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
318 the only result is yes/no/error. */
319
320 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
321 regexec(const regex_t *preg, const char *string, size_t nmatch,
322 regmatch_t pmatch[], int eflags)
323 {
324 int rc, so, eo;
325 int options = 0;
326 int *ovector = NULL;
327 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
328 BOOL allocated_ovector = FALSE;
329 BOOL nosub =
330 (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
331
332 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
333 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
334 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
335
336 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
337
338 /* When no string data is being returned, or no vector has been passed in which
339 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
340 the return data is large enough. */
341
342 if (nosub || pmatch == NULL) nmatch = 0;
343
344 else if (nmatch > 0)
345 {
346 if (nmatch <= POSIX_MALLOC_THRESHOLD)
347 {
348 ovector = &(small_ovector[0]);
349 }
350 else
351 {
352 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
353 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
354 if (ovector == NULL) return REG_ESPACE;
355 allocated_ovector = TRUE;
356 }
357 }
358
359 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
360 The man page from OS X says "REG_STARTEND affects only the location of the
361 string, not how it is matched". That is why the "so" value is used to bump the
362 start location rather than being passed as a PCRE "starting offset". */
363
364 if ((eflags & REG_STARTEND) != 0)
365 {
366 so = pmatch[0].rm_so;
367 eo = pmatch[0].rm_eo;
368 }
369 else
370 {
371 so = 0;
372 eo = (int)strlen(string);
373 }
374
375 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
376 0, options, ovector, (int)(nmatch * 3));
377
378 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
379
380 /* Successful match */
381
382 if (rc >= 0)
383 {
384 size_t i;
385 if (!nosub)
386 {
387 for (i = 0; i < (size_t)rc; i++)
388 {
389 pmatch[i].rm_so = ovector[i*2];
390 pmatch[i].rm_eo = ovector[i*2+1];
391 }
392 if (allocated_ovector) free(ovector);
393 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
394 }
395 return 0;
396 }
397
398 /* Unsuccessful match */
399
400 if (allocated_ovector) free(ovector);
401 switch(rc)
402 {
403 /* ========================================================================== */
404 /* These cases are never obeyed. This is a fudge that causes a compile-time
405 error if the vector eint, which is indexed by compile-time error number, is
406 not the correct length. It seems to be the only way to do such a check at
407 compile time, as the sizeof() operator does not work in the C preprocessor.
408 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
409
410 case 0:
411 case (sizeof(eint)/sizeof(int) == ERRCOUNT):
412 return REG_ASSERT;
413 /* ========================================================================== */
414
415 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
416 case PCRE_ERROR_NULL: return REG_INVARG;
417 case PCRE_ERROR_BADOPTION: return REG_INVARG;
418 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
419 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
420 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
421 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
422 case PCRE_ERROR_BADUTF8: return REG_INVARG;
423 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
424 case PCRE_ERROR_BADMODE: return REG_INVARG;
425 default: return REG_ASSERT;
426 }
427 }
428
429 /* End of pcreposix.c */

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