/[pcre]/code/trunk/pcreposix.c
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Contents of /code/trunk/pcreposix.c

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Revision 747 - (hide annotations) (download)
Tue Nov 15 17:35:10 2011 UTC (2 years, 9 months ago) by ph10
File MIME type: text/plain
File size: 15229 byte(s)
Fixed several items that were being incorrectly rejected as "not fixed length"
in lookbehinds. 

1 nigel 3 /*************************************************
2     * Perl-Compatible Regular Expressions *
3     *************************************************/
4    
5 nigel 77 /* 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 nigel 3
8 nigel 77 Written by Philip Hazel
9 ph10 518 Copyright (c) 1997-2010 University of Cambridge
10 nigel 3
11     -----------------------------------------------------------------------------
12 nigel 75 Redistribution and use in source and binary forms, with or without
13     modification, are permitted provided that the following conditions are met:
14 nigel 3
15 nigel 75 * Redistributions of source code must retain the above copyright notice,
16     this list of conditions and the following disclaimer.
17 nigel 3
18 nigel 75 * 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 nigel 3
22 nigel 75 * 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 nigel 29
26 nigel 75 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 nigel 3 -----------------------------------------------------------------------------
38     */
39    
40 nigel 77
41     /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42     functions. */
43    
44    
45 ph10 200 #ifdef HAVE_CONFIG_H
46 ph10 236 #include "config.h"
47 ph10 200 #endif
48 ph10 199
49    
50 ph10 200 /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51 ph10 199 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 ph10 545 /* We include pcre.h before pcre_internal.h so that the PCRE library functions
61 ph10 536 are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
62 ph10 545 This is needed even though pcre_internal.h itself includes pcre.h, because it
63 ph10 536 does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
64    
65     #include "pcre.h"
66 nigel 77 #include "pcre_internal.h"
67 nigel 3 #include "pcreposix.h"
68    
69    
70 nigel 77 /* Table to translate PCRE compile time error codes into POSIX error codes. */
71 nigel 3
72 nigel 73 static const int eint[] = {
73 nigel 77 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 ph10 461 /* 5 */
79 nigel 77 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 ph10 461 /* 10 */
85 nigel 77 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 ph10 461 /* 15 */
91 nigel 77 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 ph10 461 /* 20 */
97 nigel 77 REG_ESIZE, /* regular expression too large */
98     REG_ESPACE, /* failed to get memory */
99 ph10 418 REG_EPAREN, /* unmatched parentheses */
100 nigel 77 REG_ASSERT, /* internal error: code overflow */
101     REG_BADPAT, /* unrecognized character after (?< */
102 ph10 461 /* 25 */
103 nigel 77 REG_BADPAT, /* lookbehind assertion is not fixed length */
104 nigel 91 REG_BADPAT, /* malformed number or name after (?( */
105 nigel 93 REG_BADPAT, /* conditional group contains more than two branches */
106 nigel 77 REG_BADPAT, /* assertion expected after (?( */
107 ph10 166 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
108 ph10 461 /* 30 */
109 nigel 77 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 ph10 461 /* 35 */
115 nigel 77 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 ph10 461 /* 40 */
121 nigel 77 REG_BADPAT, /* recursive call could loop indefinitely */
122     REG_BADPAT, /* unrecognized character after (?P */
123 nigel 93 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
124 nigel 91 REG_BADPAT, /* two named subpatterns have the same name */
125 nigel 77 REG_BADPAT, /* invalid UTF-8 string */
126 ph10 461 /* 45 */
127 nigel 77 REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
128     REG_BADPAT, /* malformed \P or \p sequence */
129 nigel 91 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 ph10 461 /* 50 */
133 nigel 91 REG_BADPAT, /* repeated subpattern is too long */
134 nigel 93 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 ph10 461 /* 55 */
139 nigel 93 REG_BADPAT, /* repeating a DEFINE group is not allowed */
140     REG_INVARG, /* inconsistent NEWLINE options */
141 ph10 166 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
142 ph10 418 REG_BADPAT, /* a numbered reference must not be zero */
143 ph10 510 REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
144 ph10 418 /* 60 */
145 ph10 461 REG_BADPAT, /* (*VERB) not recognized */
146 ph10 268 REG_BADPAT, /* number is too big */
147 ph10 286 REG_BADPAT, /* subpattern name expected */
148 ph10 336 REG_BADPAT, /* digit expected after (?+ */
149 ph10 457 REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
150     /* 65 */
151 ph10 510 REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
152     REG_BADPAT, /* (*MARK) must have an argument */
153 ph10 518 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UCP support */
154 ph10 579 REG_BADPAT, /* \c must be followed by an ASCII character */
155 ph10 654 REG_BADPAT, /* \k is not followed by a braced, angle-bracketed, or quoted name */
156 ph10 747 /* 70 */
157     REG_BADPAT, /* internal error: unknown opcode in find_fixedlength() */
158 nigel 3 };
159    
160     /* Table of texts corresponding to POSIX error codes */
161    
162 nigel 73 static const char *const pstring[] = {
163 nigel 3 "", /* Dummy for value 0 */
164     "internal error", /* REG_ASSERT */
165     "invalid repeat counts in {}", /* BADBR */
166     "pattern error", /* BADPAT */
167     "? * + invalid", /* BADRPT */
168     "unbalanced {}", /* EBRACE */
169     "unbalanced []", /* EBRACK */
170     "collation error - not relevant", /* ECOLLATE */
171     "bad class", /* ECTYPE */
172     "bad escape sequence", /* EESCAPE */
173     "empty expression", /* EMPTY */
174     "unbalanced ()", /* EPAREN */
175     "bad range inside []", /* ERANGE */
176     "expression too big", /* ESIZE */
177     "failed to get memory", /* ESPACE */
178     "bad back reference", /* ESUBREG */
179     "bad argument", /* INVARG */
180     "match failed" /* NOMATCH */
181     };
182    
183    
184    
185    
186     /*************************************************
187     * Translate error code to string *
188     *************************************************/
189    
190 ph10 359 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
191 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
192     {
193 nigel 7 const char *message, *addmessage;
194     size_t length, addlength;
195 nigel 3
196 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
197 nigel 3 "unknown error code" : pstring[errcode];
198 nigel 7 length = strlen(message) + 1;
199 nigel 3
200 nigel 7 addmessage = " at offset ";
201     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
202     strlen(addmessage) + 6 : 0;
203 nigel 3
204     if (errbuf_size > 0)
205     {
206 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
207 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
208 nigel 3 else
209     {
210     strncpy(errbuf, message, errbuf_size - 1);
211     errbuf[errbuf_size-1] = 0;
212     }
213     }
214    
215 nigel 7 return length + addlength;
216 nigel 3 }
217    
218    
219    
220    
221     /*************************************************
222     * Free store held by a regex *
223     *************************************************/
224    
225 ph10 359 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
226 nigel 3 regfree(regex_t *preg)
227     {
228     (pcre_free)(preg->re_pcre);
229     }
230    
231    
232    
233    
234     /*************************************************
235     * Compile a regular expression *
236     *************************************************/
237    
238     /*
239     Arguments:
240     preg points to a structure for recording the compiled expression
241     pattern the pattern to compile
242     cflags compilation flags
243    
244     Returns: 0 on success
245     various non-zero codes on failure
246     */
247    
248 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
249 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
250     {
251 nigel 7 const char *errorptr;
252 nigel 3 int erroffset;
253 nigel 77 int errorcode;
254 nigel 3 int options = 0;
255    
256 ph10 432 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
257     if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
258     if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
259     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
260     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
261 ph10 518 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
262 ph10 432 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
263 nigel 3
264 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
265     &erroffset, NULL);
266 nigel 3 preg->re_erroffset = erroffset;
267    
268 ph10 461 /* Safety: if the error code is too big for the translation vector (which
269 ph10 418 should not happen, but we all make mistakes), return REG_BADPAT. */
270 nigel 3
271 ph10 461 if (preg->re_pcre == NULL)
272 ph10 418 {
273     return (errorcode < sizeof(eint)/sizeof(const int))?
274     eint[errorcode] : REG_BADPAT;
275 ph10 461 }
276 ph10 418
277 nigel 71 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
278 nigel 3 return 0;
279     }
280    
281    
282    
283    
284     /*************************************************
285     * Match a regular expression *
286     *************************************************/
287    
288 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
289     substring, so we have to get and release working store instead of just using
290     the POSIX structures as was done in earlier releases when PCRE needed only 2
291 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
292     block of store on the stack, to reduce the use of malloc/free. The threshold is
293 nigel 87 in a macro that can be changed at configure time.
294 nigel 41
295 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
296     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
297     the only result is yes/no/error. */
298    
299 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
300 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
301 nigel 3 regmatch_t pmatch[], int eflags)
302     {
303 ph10 332 int rc, so, eo;
304 nigel 3 int options = 0;
305 nigel 41 int *ovector = NULL;
306 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
307     BOOL allocated_ovector = FALSE;
308 nigel 87 BOOL nosub =
309     (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
310 nigel 3
311     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
312     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
313 ph10 388 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
314 nigel 3
315 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
316 nigel 3
317 ph10 461 /* When no string data is being returned, or no vector has been passed in which
318 ph10 432 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
319     the return data is large enough. */
320 nigel 87
321 ph10 432 if (nosub || pmatch == NULL) nmatch = 0;
322 nigel 87
323     else if (nmatch > 0)
324 nigel 41 {
325 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
326     {
327     ovector = &(small_ovector[0]);
328     }
329     else
330     {
331 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
332 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
333     if (ovector == NULL) return REG_ESPACE;
334     allocated_ovector = TRUE;
335     }
336 nigel 41 }
337    
338 ph10 332 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
339     The man page from OS X says "REG_STARTEND affects only the location of the
340 ph10 345 string, not how it is matched". That is why the "so" value is used to bump the
341 ph10 332 start location rather than being passed as a PCRE "starting offset". */
342    
343 ph10 345 if ((eflags & REG_STARTEND) != 0)
344 ph10 332 {
345     so = pmatch[0].rm_so;
346     eo = pmatch[0].rm_eo;
347 ph10 345 }
348     else
349 ph10 332 {
350     so = 0;
351 ph10 530 eo = (int)strlen(string);
352 ph10 332 }
353    
354     rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
355 ph10 530 0, options, ovector, (int)(nmatch * 3));
356 nigel 3
357 ph10 530 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
358 nigel 3
359 ph10 499 /* Successful match */
360    
361 nigel 41 if (rc >= 0)
362 nigel 3 {
363 nigel 7 size_t i;
364 nigel 87 if (!nosub)
365 nigel 41 {
366 nigel 87 for (i = 0; i < (size_t)rc; i++)
367     {
368     pmatch[i].rm_so = ovector[i*2];
369     pmatch[i].rm_eo = ovector[i*2+1];
370     }
371     if (allocated_ovector) free(ovector);
372     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
373 nigel 41 }
374 nigel 3 return 0;
375     }
376    
377 ph10 499 /* Unsuccessful match */
378    
379     if (allocated_ovector) free(ovector);
380     switch(rc)
381 nigel 3 {
382 ph10 499 /* ========================================================================== */
383     /* These cases are never obeyed. This is a fudge that causes a compile-time
384     error if the vector eint, which is indexed by compile-time error number, is
385     not the correct length. It seems to be the only way to do such a check at
386     compile time, as the sizeof() operator does not work in the C preprocessor.
387 ph10 507 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
388 ph10 499
389     case 0:
390     case (sizeof(eint)/sizeof(int) == ERRCOUNT):
391     return REG_ASSERT;
392     /* ========================================================================== */
393    
394     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
395     case PCRE_ERROR_NULL: return REG_INVARG;
396     case PCRE_ERROR_BADOPTION: return REG_INVARG;
397     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
398     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
399     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
400     case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
401     case PCRE_ERROR_BADUTF8: return REG_INVARG;
402     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
403     default: return REG_ASSERT;
404 nigel 3 }
405     }
406    
407     /* End of pcreposix.c */

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