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

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