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