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 #include "config.h"
46
47
48 /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
49 compiling these functions. This must come before including pcreposix.h, where
50 they are set for an application (using these functions) if they have not
51 previously been set. */
52
53 #if defined(_WIN32) && !defined(PCRE_STATIC)
54 # define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
55 # define PCREPOSIX_EXP_DEFN __declspec(dllexport)
56 #endif
57
58 /* We include pcre.h before pcre_internal.h so that the PCRE library functions
59 are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
60 This is needed even though pcre_internal.h itself includes pcre.h, because it
61 does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
62
63 #include "pcre.h"
64 #include "pcre_internal.h"
65 #include "pcreposix.h"
66
67
68 /* Table to translate PCRE compile time error codes into POSIX error codes. */
69
70 static const int eint[] = {
71 0, /* no error */
72 REG_EESCAPE, /* \ at end of pattern */
73 REG_EESCAPE, /* \c at end of pattern */
74 REG_EESCAPE, /* unrecognized character follows \ */
75 REG_BADBR, /* numbers out of order in {} quantifier */
76 /* 5 */
77 REG_BADBR, /* number too big in {} quantifier */
78 REG_EBRACK, /* missing terminating ] for character class */
79 REG_ECTYPE, /* invalid escape sequence in character class */
80 REG_ERANGE, /* range out of order in character class */
81 REG_BADRPT, /* nothing to repeat */
82 /* 10 */
83 REG_BADRPT, /* operand of unlimited repeat could match the empty string */
84 REG_ASSERT, /* internal error: unexpected repeat */
85 REG_BADPAT, /* unrecognized character after (? */
86 REG_BADPAT, /* POSIX named classes are supported only within a class */
87 REG_EPAREN, /* missing ) */
88 /* 15 */
89 REG_ESUBREG, /* reference to non-existent subpattern */
90 REG_INVARG, /* erroffset passed as NULL */
91 REG_INVARG, /* unknown option bit(s) set */
92 REG_EPAREN, /* missing ) after comment */
93 REG_ESIZE, /* parentheses nested too deeply */
94 /* 20 */
95 REG_ESIZE, /* regular expression too large */
96 REG_ESPACE, /* failed to get memory */
97 REG_EPAREN, /* unmatched parentheses */
98 REG_ASSERT, /* internal error: code overflow */
99 REG_BADPAT, /* unrecognized character after (?< */
100 /* 25 */
101 REG_BADPAT, /* lookbehind assertion is not fixed length */
102 REG_BADPAT, /* malformed number or name after (?( */
103 REG_BADPAT, /* conditional group contains more than two branches */
104 REG_BADPAT, /* assertion expected after (?( */
105 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
106 /* 30 */
107 REG_ECTYPE, /* unknown POSIX class name */
108 REG_BADPAT, /* POSIX collating elements are not supported */
109 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
110 REG_BADPAT, /* spare error */
111 REG_BADPAT, /* character value in \x{} or \o{} is too large */
112 /* 35 */
113 REG_BADPAT, /* invalid condition (?(0) */
114 REG_BADPAT, /* \C not allowed in lookbehind assertion */
115 REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
116 REG_BADPAT, /* number after (?C is > 255 */
117 REG_BADPAT, /* closing ) for (?C expected */
118 /* 40 */
119 REG_BADPAT, /* recursive call could loop indefinitely */
120 REG_BADPAT, /* unrecognized character after (?P */
121 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
122 REG_BADPAT, /* two named subpatterns have the same name */
123 REG_BADPAT, /* invalid UTF-8 string */
124 /* 45 */
125 REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
126 REG_BADPAT, /* malformed \P or \p sequence */
127 REG_BADPAT, /* unknown property name after \P or \p */
128 REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
129 REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
130 /* 50 */
131 REG_BADPAT, /* repeated subpattern is too long */
132 REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
133 REG_BADPAT, /* internal error: overran compiling workspace */
134 REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
135 REG_BADPAT, /* DEFINE group contains more than one branch */
136 /* 55 */
137 REG_BADPAT, /* repeating a DEFINE group is not allowed */
138 REG_INVARG, /* inconsistent NEWLINE options */
139 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
140 REG_BADPAT, /* a numbered reference must not be zero */
141 REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
142 /* 60 */
143 REG_BADPAT, /* (*VERB) not recognized */
144 REG_BADPAT, /* number is too big */
145 REG_BADPAT, /* subpattern name expected */
146 REG_BADPAT, /* digit expected after (?+ */
147 REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
148 /* 65 */
149 REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
150 REG_BADPAT, /* (*MARK) must have an argument */
151 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UCP support */
152 REG_BADPAT, /* \c must be followed by an ASCII character */
153 REG_BADPAT, /* \k is not followed by a braced, angle-bracketed, or quoted name */
154 /* 70 */
155 REG_BADPAT, /* internal error: unknown opcode in find_fixedlength() */
156 REG_BADPAT, /* \N is not supported in a class */
157 REG_BADPAT, /* too many forward references */
158 REG_BADPAT, /* disallowed UTF-8/16/32 code point (>= 0xd800 && <= 0xdfff) */
159 REG_BADPAT, /* invalid UTF-16 string (should not occur) */
160 /* 75 */
161 REG_BADPAT, /* overlong MARK name */
162 REG_BADPAT, /* character value in \u.... sequence is too large */
163 REG_BADPAT, /* invalid UTF-32 string (should not occur) */
164 REG_BADPAT, /* setting UTF is disabled by the application */
165 REG_BADPAT, /* non-hex character in \\x{} (closing brace missing?) */
166 /* 80 */
167 REG_BADPAT, /* non-octal character in \o{} (closing brace missing?) */
168 REG_BADPAT, /* missing opening brace after \o */
169 REG_BADPAT, /* parentheses too deeply nested */
170 REG_BADPAT, /* invalid range in character class */
171 REG_BADPAT, /* group name must start with a non-digit */
172 /* 85 */
173 REG_BADPAT, /* parentheses too deeply nested (stack check) */
174 REG_BADPAT /* missing digits in \x{} or \o{} */
175 };
176
177 /* Table of texts corresponding to POSIX error codes */
178
179 static const char *const pstring[] = {
180 "", /* Dummy for value 0 */
181 "internal error", /* REG_ASSERT */
182 "invalid repeat counts in {}", /* BADBR */
183 "pattern error", /* BADPAT */
184 "? * + invalid", /* BADRPT */
185 "unbalanced {}", /* EBRACE */
186 "unbalanced []", /* EBRACK */
187 "collation error - not relevant", /* ECOLLATE */
188 "bad class", /* ECTYPE */
189 "bad escape sequence", /* EESCAPE */
190 "empty expression", /* EMPTY */
191 "unbalanced ()", /* EPAREN */
192 "bad range inside []", /* ERANGE */
193 "expression too big", /* ESIZE */
194 "failed to get memory", /* ESPACE */
195 "bad back reference", /* ESUBREG */
196 "bad argument", /* INVARG */
197 "match failed" /* NOMATCH */
198 };
199
200
201
202
203 /*************************************************
204 * Translate error code to string *
205 *************************************************/
206
207 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
208 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
209 {
210 const char *message, *addmessage;
211 size_t length, addlength;
212
213 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
214 "unknown error code" : pstring[errcode];
215 length = strlen(message) + 1;
216
217 addmessage = " at offset ";
218 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
219 strlen(addmessage) + 6 : 0;
220
221 if (errbuf_size > 0)
222 {
223 if (addlength > 0 && errbuf_size >= length + addlength)
224 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
225 else
226 {
227 strncpy(errbuf, message, errbuf_size - 1);
228 errbuf[errbuf_size-1] = 0;
229 }
230 }
231
232 return length + addlength;
233 }
234
235
236
237
238 /*************************************************
239 * Free store held by a regex *
240 *************************************************/
241
242 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
243 regfree(regex_t *preg)
244 {
245 (PUBL(free))(preg->re_pcre);
246 }
247
248
249
250
251 /*************************************************
252 * Compile a regular expression *
253 *************************************************/
254
255 /*
256 Arguments:
257 preg points to a structure for recording the compiled expression
258 pattern the pattern to compile
259 cflags compilation flags
260
261 Returns: 0 on success
262 various non-zero codes on failure
263 */
264
265 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
266 regcomp(regex_t *preg, const char *pattern, int cflags)
267 {
268 const char *errorptr;
269 int erroffset;
270 int errorcode;
271 int options = 0;
272 int re_nsub = 0;
273
274 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
275 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
276 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
277 if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
278 if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
279 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
280 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
281
282 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
283 &erroffset, NULL);
284 preg->re_erroffset = erroffset;
285
286 /* Safety: if the error code is too big for the translation vector (which
287 should not happen, but we all make mistakes), return REG_BADPAT. */
288
289 if (preg->re_pcre == NULL)
290 {
291 return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
292 eint[errorcode] : REG_BADPAT;
293 }
294
295 (void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
296 &re_nsub);
297 preg->re_nsub = (size_t)re_nsub;
298 return 0;
299 }
300
301
302
303
304 /*************************************************
305 * Match a regular expression *
306 *************************************************/
307
308 /* Unfortunately, PCRE requires 3 ints of working space for each captured
309 substring, so we have to get and release working store instead of just using
310 the POSIX structures as was done in earlier releases when PCRE needed only 2
311 ints. However, if the number of possible capturing brackets is small, use a
312 block of store on the stack, to reduce the use of malloc/free. The threshold is
313 in a macro that can be changed at configure time.
314
315 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
316 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
317 the only result is yes/no/error. */
318
319 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
320 regexec(const regex_t *preg, const char *string, size_t nmatch,
321 regmatch_t pmatch[], int eflags)
322 {
323 int rc, so, eo;
324 int options = 0;
325 int *ovector = NULL;
326 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
327 BOOL allocated_ovector = FALSE;
328 BOOL nosub =
329 (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
330
331 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
332 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
333 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
334
335 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
336
337 /* When no string data is being returned, or no vector has been passed in which
338 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
339 the return data is large enough. */
340
341 if (nosub || pmatch == NULL) nmatch = 0;
342
343 else if (nmatch > 0)
344 {
345 if (nmatch <= POSIX_MALLOC_THRESHOLD)
346 {
347 ovector = &(small_ovector[0]);
348 }
349 else
350 {
351 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
352 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
353 if (ovector == NULL) return REG_ESPACE;
354 allocated_ovector = TRUE;
355 }
356 }
357
358 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
359 The man page from OS X says "REG_STARTEND affects only the location of the
360 string, not how it is matched". That is why the "so" value is used to bump the
361 start location rather than being passed as a PCRE "starting offset". */
362
363 if ((eflags & REG_STARTEND) != 0)
364 {
365 so = pmatch[0].rm_so;
366 eo = pmatch[0].rm_eo;
367 }
368 else
369 {
370 so = 0;
371 eo = (int)strlen(string);
372 }
373
374 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
375 0, options, ovector, (int)(nmatch * 3));
376
377 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
378
379 /* Successful match */
380
381 if (rc >= 0)
382 {
383 size_t i;
384 if (!nosub)
385 {
386 for (i = 0; i < (size_t)rc; i++)
387 {
388 pmatch[i].rm_so = ovector[i*2];
389 pmatch[i].rm_eo = ovector[i*2+1];
390 }
391 if (allocated_ovector) free(ovector);
392 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
393 }
394 return 0;
395 }
396
397 /* Unsuccessful match */
398
399 if (allocated_ovector) free(ovector);
400 switch(rc)
401 {
402 /* ========================================================================== */
403 /* These cases are never obeyed. This is a fudge that causes a compile-time
404 error if the vector eint, which is indexed by compile-time error number, is
405 not the correct length. It seems to be the only way to do such a check at
406 compile time, as the sizeof() operator does not work in the C preprocessor.
407 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
408
409 case 0:
410 case (sizeof(eint)/sizeof(int) == ERRCOUNT):
411 return REG_ASSERT;
412 /* ========================================================================== */
413
414 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
415 case PCRE_ERROR_NULL: return REG_INVARG;
416 case PCRE_ERROR_BADOPTION: return REG_INVARG;
417 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
418 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
419 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
420 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
421 case PCRE_ERROR_BADUTF8: return REG_INVARG;
422 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
423 case PCRE_ERROR_BADMODE: return REG_INVARG;
424 default: return REG_ASSERT;
425 }
426 }
427
428 /* End of pcreposix.c */