/[pcre]/code/trunk/pcreposix.c
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Revision 629 - (hide annotations) (download)
Fri Jul 22 09:18:11 2011 UTC (3 years ago) by ph10
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File size: 15144 byte(s)
Fix isolated \k bug.

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 629 REG_BADPAT, /* \k is not followed by a braced, angle-bracketed, or quoted name */
156 nigel 3 };
157    
158     /* Table of texts corresponding to POSIX error codes */
159    
160 nigel 73 static const char *const pstring[] = {
161 nigel 3 "", /* Dummy for value 0 */
162     "internal error", /* REG_ASSERT */
163     "invalid repeat counts in {}", /* BADBR */
164     "pattern error", /* BADPAT */
165     "? * + invalid", /* BADRPT */
166     "unbalanced {}", /* EBRACE */
167     "unbalanced []", /* EBRACK */
168     "collation error - not relevant", /* ECOLLATE */
169     "bad class", /* ECTYPE */
170     "bad escape sequence", /* EESCAPE */
171     "empty expression", /* EMPTY */
172     "unbalanced ()", /* EPAREN */
173     "bad range inside []", /* ERANGE */
174     "expression too big", /* ESIZE */
175     "failed to get memory", /* ESPACE */
176     "bad back reference", /* ESUBREG */
177     "bad argument", /* INVARG */
178     "match failed" /* NOMATCH */
179     };
180    
181    
182    
183    
184     /*************************************************
185     * Translate error code to string *
186     *************************************************/
187    
188 ph10 359 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
189 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
190     {
191 nigel 7 const char *message, *addmessage;
192     size_t length, addlength;
193 nigel 3
194 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
195 nigel 3 "unknown error code" : pstring[errcode];
196 nigel 7 length = strlen(message) + 1;
197 nigel 3
198 nigel 7 addmessage = " at offset ";
199     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
200     strlen(addmessage) + 6 : 0;
201 nigel 3
202     if (errbuf_size > 0)
203     {
204 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
205 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
206 nigel 3 else
207     {
208     strncpy(errbuf, message, errbuf_size - 1);
209     errbuf[errbuf_size-1] = 0;
210     }
211     }
212    
213 nigel 7 return length + addlength;
214 nigel 3 }
215    
216    
217    
218    
219     /*************************************************
220     * Free store held by a regex *
221     *************************************************/
222    
223 ph10 359 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
224 nigel 3 regfree(regex_t *preg)
225     {
226     (pcre_free)(preg->re_pcre);
227     }
228    
229    
230    
231    
232     /*************************************************
233     * Compile a regular expression *
234     *************************************************/
235    
236     /*
237     Arguments:
238     preg points to a structure for recording the compiled expression
239     pattern the pattern to compile
240     cflags compilation flags
241    
242     Returns: 0 on success
243     various non-zero codes on failure
244     */
245    
246 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
247 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
248     {
249 nigel 7 const char *errorptr;
250 nigel 3 int erroffset;
251 nigel 77 int errorcode;
252 nigel 3 int options = 0;
253    
254 ph10 432 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
255     if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
256     if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
257     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
258     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
259 ph10 518 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
260 ph10 432 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
261 nigel 3
262 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
263     &erroffset, NULL);
264 nigel 3 preg->re_erroffset = erroffset;
265    
266 ph10 461 /* Safety: if the error code is too big for the translation vector (which
267 ph10 418 should not happen, but we all make mistakes), return REG_BADPAT. */
268 nigel 3
269 ph10 461 if (preg->re_pcre == NULL)
270 ph10 418 {
271     return (errorcode < sizeof(eint)/sizeof(const int))?
272     eint[errorcode] : REG_BADPAT;
273 ph10 461 }
274 ph10 418
275 nigel 71 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
276 nigel 3 return 0;
277     }
278    
279    
280    
281    
282     /*************************************************
283     * Match a regular expression *
284     *************************************************/
285    
286 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
287     substring, so we have to get and release working store instead of just using
288     the POSIX structures as was done in earlier releases when PCRE needed only 2
289 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
290     block of store on the stack, to reduce the use of malloc/free. The threshold is
291 nigel 87 in a macro that can be changed at configure time.
292 nigel 41
293 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
294     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
295     the only result is yes/no/error. */
296    
297 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
298 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
299 nigel 3 regmatch_t pmatch[], int eflags)
300     {
301 ph10 332 int rc, so, eo;
302 nigel 3 int options = 0;
303 nigel 41 int *ovector = NULL;
304 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
305     BOOL allocated_ovector = FALSE;
306 nigel 87 BOOL nosub =
307     (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
308 nigel 3
309     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
310     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
311 ph10 388 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
312 nigel 3
313 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
314 nigel 3
315 ph10 461 /* When no string data is being returned, or no vector has been passed in which
316 ph10 432 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
317     the return data is large enough. */
318 nigel 87
319 ph10 432 if (nosub || pmatch == NULL) nmatch = 0;
320 nigel 87
321     else if (nmatch > 0)
322 nigel 41 {
323 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
324     {
325     ovector = &(small_ovector[0]);
326     }
327     else
328     {
329 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
330 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
331     if (ovector == NULL) return REG_ESPACE;
332     allocated_ovector = TRUE;
333     }
334 nigel 41 }
335    
336 ph10 332 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
337     The man page from OS X says "REG_STARTEND affects only the location of the
338 ph10 345 string, not how it is matched". That is why the "so" value is used to bump the
339 ph10 332 start location rather than being passed as a PCRE "starting offset". */
340    
341 ph10 345 if ((eflags & REG_STARTEND) != 0)
342 ph10 332 {
343     so = pmatch[0].rm_so;
344     eo = pmatch[0].rm_eo;
345 ph10 345 }
346     else
347 ph10 332 {
348     so = 0;
349 ph10 530 eo = (int)strlen(string);
350 ph10 332 }
351    
352     rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
353 ph10 530 0, options, ovector, (int)(nmatch * 3));
354 nigel 3
355 ph10 530 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
356 nigel 3
357 ph10 499 /* Successful match */
358    
359 nigel 41 if (rc >= 0)
360 nigel 3 {
361 nigel 7 size_t i;
362 nigel 87 if (!nosub)
363 nigel 41 {
364 nigel 87 for (i = 0; i < (size_t)rc; i++)
365     {
366     pmatch[i].rm_so = ovector[i*2];
367     pmatch[i].rm_eo = ovector[i*2+1];
368     }
369     if (allocated_ovector) free(ovector);
370     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
371 nigel 41 }
372 nigel 3 return 0;
373     }
374    
375 ph10 499 /* Unsuccessful match */
376    
377     if (allocated_ovector) free(ovector);
378     switch(rc)
379 nigel 3 {
380 ph10 499 /* ========================================================================== */
381     /* These cases are never obeyed. This is a fudge that causes a compile-time
382     error if the vector eint, which is indexed by compile-time error number, is
383     not the correct length. It seems to be the only way to do such a check at
384     compile time, as the sizeof() operator does not work in the C preprocessor.
385 ph10 507 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
386 ph10 499
387     case 0:
388     case (sizeof(eint)/sizeof(int) == ERRCOUNT):
389     return REG_ASSERT;
390     /* ========================================================================== */
391    
392     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
393     case PCRE_ERROR_NULL: return REG_INVARG;
394     case PCRE_ERROR_BADOPTION: return REG_INVARG;
395     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
396     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
397     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
398     case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
399     case PCRE_ERROR_BADUTF8: return REG_INVARG;
400     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
401     default: return REG_ASSERT;
402 nigel 3 }
403     }
404    
405     /* End of pcreposix.c */

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