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

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Revision 510 - (hide annotations) (download)
Sat Mar 27 17:45:29 2010 UTC (4 years, 5 months ago) by ph10
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Add support for *MARK and names for *PRUNE, *SKIP, *THEN.

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 388 Copyright (c) 1997-2009 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 236 #include "pcre.h"
61 nigel 77 #include "pcre_internal.h"
62 nigel 3 #include "pcreposix.h"
63    
64    
65 nigel 77 /* Table to translate PCRE compile time error codes into POSIX error codes. */
66 nigel 3
67 nigel 73 static const int eint[] = {
68 nigel 77 0, /* no error */
69     REG_EESCAPE, /* \ at end of pattern */
70     REG_EESCAPE, /* \c at end of pattern */
71     REG_EESCAPE, /* unrecognized character follows \ */
72     REG_BADBR, /* numbers out of order in {} quantifier */
73 ph10 461 /* 5 */
74 nigel 77 REG_BADBR, /* number too big in {} quantifier */
75     REG_EBRACK, /* missing terminating ] for character class */
76     REG_ECTYPE, /* invalid escape sequence in character class */
77     REG_ERANGE, /* range out of order in character class */
78     REG_BADRPT, /* nothing to repeat */
79 ph10 461 /* 10 */
80 nigel 77 REG_BADRPT, /* operand of unlimited repeat could match the empty string */
81     REG_ASSERT, /* internal error: unexpected repeat */
82     REG_BADPAT, /* unrecognized character after (? */
83     REG_BADPAT, /* POSIX named classes are supported only within a class */
84     REG_EPAREN, /* missing ) */
85 ph10 461 /* 15 */
86 nigel 77 REG_ESUBREG, /* reference to non-existent subpattern */
87     REG_INVARG, /* erroffset passed as NULL */
88     REG_INVARG, /* unknown option bit(s) set */
89     REG_EPAREN, /* missing ) after comment */
90     REG_ESIZE, /* parentheses nested too deeply */
91 ph10 461 /* 20 */
92 nigel 77 REG_ESIZE, /* regular expression too large */
93     REG_ESPACE, /* failed to get memory */
94 ph10 418 REG_EPAREN, /* unmatched parentheses */
95 nigel 77 REG_ASSERT, /* internal error: code overflow */
96     REG_BADPAT, /* unrecognized character after (?< */
97 ph10 461 /* 25 */
98 nigel 77 REG_BADPAT, /* lookbehind assertion is not fixed length */
99 nigel 91 REG_BADPAT, /* malformed number or name after (?( */
100 nigel 93 REG_BADPAT, /* conditional group contains more than two branches */
101 nigel 77 REG_BADPAT, /* assertion expected after (?( */
102 ph10 166 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
103 ph10 461 /* 30 */
104 nigel 77 REG_ECTYPE, /* unknown POSIX class name */
105     REG_BADPAT, /* POSIX collating elements are not supported */
106     REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
107     REG_BADPAT, /* spare error */
108     REG_BADPAT, /* character value in \x{...} sequence is too large */
109 ph10 461 /* 35 */
110 nigel 77 REG_BADPAT, /* invalid condition (?(0) */
111     REG_BADPAT, /* \C not allowed in lookbehind assertion */
112     REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
113     REG_BADPAT, /* number after (?C is > 255 */
114     REG_BADPAT, /* closing ) for (?C expected */
115 ph10 461 /* 40 */
116 nigel 77 REG_BADPAT, /* recursive call could loop indefinitely */
117     REG_BADPAT, /* unrecognized character after (?P */
118 nigel 93 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
119 nigel 91 REG_BADPAT, /* two named subpatterns have the same name */
120 nigel 77 REG_BADPAT, /* invalid UTF-8 string */
121 ph10 461 /* 45 */
122 nigel 77 REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
123     REG_BADPAT, /* malformed \P or \p sequence */
124 nigel 91 REG_BADPAT, /* unknown property name after \P or \p */
125     REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
126     REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
127 ph10 461 /* 50 */
128 nigel 91 REG_BADPAT, /* repeated subpattern is too long */
129 nigel 93 REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
130     REG_BADPAT, /* internal error: overran compiling workspace */
131     REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
132     REG_BADPAT, /* DEFINE group contains more than one branch */
133 ph10 461 /* 55 */
134 nigel 93 REG_BADPAT, /* repeating a DEFINE group is not allowed */
135     REG_INVARG, /* inconsistent NEWLINE options */
136 ph10 166 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
137 ph10 418 REG_BADPAT, /* a numbered reference must not be zero */
138 ph10 510 REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
139 ph10 418 /* 60 */
140 ph10 461 REG_BADPAT, /* (*VERB) not recognized */
141 ph10 268 REG_BADPAT, /* number is too big */
142 ph10 286 REG_BADPAT, /* subpattern name expected */
143 ph10 336 REG_BADPAT, /* digit expected after (?+ */
144 ph10 457 REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
145     /* 65 */
146 ph10 510 REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
147     REG_BADPAT, /* (*MARK) must have an argument */
148 nigel 3 };
149    
150     /* Table of texts corresponding to POSIX error codes */
151    
152 nigel 73 static const char *const pstring[] = {
153 nigel 3 "", /* Dummy for value 0 */
154     "internal error", /* REG_ASSERT */
155     "invalid repeat counts in {}", /* BADBR */
156     "pattern error", /* BADPAT */
157     "? * + invalid", /* BADRPT */
158     "unbalanced {}", /* EBRACE */
159     "unbalanced []", /* EBRACK */
160     "collation error - not relevant", /* ECOLLATE */
161     "bad class", /* ECTYPE */
162     "bad escape sequence", /* EESCAPE */
163     "empty expression", /* EMPTY */
164     "unbalanced ()", /* EPAREN */
165     "bad range inside []", /* ERANGE */
166     "expression too big", /* ESIZE */
167     "failed to get memory", /* ESPACE */
168     "bad back reference", /* ESUBREG */
169     "bad argument", /* INVARG */
170     "match failed" /* NOMATCH */
171     };
172    
173    
174    
175    
176     /*************************************************
177     * Translate error code to string *
178     *************************************************/
179    
180 ph10 359 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
181 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
182     {
183 nigel 7 const char *message, *addmessage;
184     size_t length, addlength;
185 nigel 3
186 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
187 nigel 3 "unknown error code" : pstring[errcode];
188 nigel 7 length = strlen(message) + 1;
189 nigel 3
190 nigel 7 addmessage = " at offset ";
191     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
192     strlen(addmessage) + 6 : 0;
193 nigel 3
194     if (errbuf_size > 0)
195     {
196 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
197 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
198 nigel 3 else
199     {
200     strncpy(errbuf, message, errbuf_size - 1);
201     errbuf[errbuf_size-1] = 0;
202     }
203     }
204    
205 nigel 7 return length + addlength;
206 nigel 3 }
207    
208    
209    
210    
211     /*************************************************
212     * Free store held by a regex *
213     *************************************************/
214    
215 ph10 359 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
216 nigel 3 regfree(regex_t *preg)
217     {
218     (pcre_free)(preg->re_pcre);
219     }
220    
221    
222    
223    
224     /*************************************************
225     * Compile a regular expression *
226     *************************************************/
227    
228     /*
229     Arguments:
230     preg points to a structure for recording the compiled expression
231     pattern the pattern to compile
232     cflags compilation flags
233    
234     Returns: 0 on success
235     various non-zero codes on failure
236     */
237    
238 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
239 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
240     {
241 nigel 7 const char *errorptr;
242 nigel 3 int erroffset;
243 nigel 77 int errorcode;
244 nigel 3 int options = 0;
245    
246 ph10 432 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
247     if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
248     if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
249     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
250     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
251     if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
252 nigel 3
253 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
254     &erroffset, NULL);
255 nigel 3 preg->re_erroffset = erroffset;
256    
257 ph10 461 /* Safety: if the error code is too big for the translation vector (which
258 ph10 418 should not happen, but we all make mistakes), return REG_BADPAT. */
259 nigel 3
260 ph10 461 if (preg->re_pcre == NULL)
261 ph10 418 {
262     return (errorcode < sizeof(eint)/sizeof(const int))?
263     eint[errorcode] : REG_BADPAT;
264 ph10 461 }
265 ph10 418
266 nigel 71 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
267 nigel 3 return 0;
268     }
269    
270    
271    
272    
273     /*************************************************
274     * Match a regular expression *
275     *************************************************/
276    
277 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
278     substring, so we have to get and release working store instead of just using
279     the POSIX structures as was done in earlier releases when PCRE needed only 2
280 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
281     block of store on the stack, to reduce the use of malloc/free. The threshold is
282 nigel 87 in a macro that can be changed at configure time.
283 nigel 41
284 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
285     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
286     the only result is yes/no/error. */
287    
288 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
289 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
290 nigel 3 regmatch_t pmatch[], int eflags)
291     {
292 ph10 332 int rc, so, eo;
293 nigel 3 int options = 0;
294 nigel 41 int *ovector = NULL;
295 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
296     BOOL allocated_ovector = FALSE;
297 nigel 87 BOOL nosub =
298     (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
299 nigel 3
300     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
301     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
302 ph10 388 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
303 nigel 3
304 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
305 nigel 3
306 ph10 461 /* When no string data is being returned, or no vector has been passed in which
307 ph10 432 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
308     the return data is large enough. */
309 nigel 87
310 ph10 432 if (nosub || pmatch == NULL) nmatch = 0;
311 nigel 87
312     else if (nmatch > 0)
313 nigel 41 {
314 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
315     {
316     ovector = &(small_ovector[0]);
317     }
318     else
319     {
320 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
321 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
322     if (ovector == NULL) return REG_ESPACE;
323     allocated_ovector = TRUE;
324     }
325 nigel 41 }
326    
327 ph10 332 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
328     The man page from OS X says "REG_STARTEND affects only the location of the
329 ph10 345 string, not how it is matched". That is why the "so" value is used to bump the
330 ph10 332 start location rather than being passed as a PCRE "starting offset". */
331    
332 ph10 345 if ((eflags & REG_STARTEND) != 0)
333 ph10 332 {
334     so = pmatch[0].rm_so;
335     eo = pmatch[0].rm_eo;
336 ph10 345 }
337     else
338 ph10 332 {
339     so = 0;
340     eo = strlen(string);
341     }
342    
343     rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
344 nigel 71 0, options, ovector, nmatch * 3);
345 nigel 3
346 nigel 41 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
347 nigel 3
348 ph10 499 /* Successful match */
349    
350 nigel 41 if (rc >= 0)
351 nigel 3 {
352 nigel 7 size_t i;
353 nigel 87 if (!nosub)
354 nigel 41 {
355 nigel 87 for (i = 0; i < (size_t)rc; i++)
356     {
357     pmatch[i].rm_so = ovector[i*2];
358     pmatch[i].rm_eo = ovector[i*2+1];
359     }
360     if (allocated_ovector) free(ovector);
361     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
362 nigel 41 }
363 nigel 3 return 0;
364     }
365    
366 ph10 499 /* Unsuccessful match */
367    
368     if (allocated_ovector) free(ovector);
369     switch(rc)
370 nigel 3 {
371 ph10 499 /* ========================================================================== */
372     /* These cases are never obeyed. This is a fudge that causes a compile-time
373     error if the vector eint, which is indexed by compile-time error number, is
374     not the correct length. It seems to be the only way to do such a check at
375     compile time, as the sizeof() operator does not work in the C preprocessor.
376 ph10 507 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
377 ph10 499
378     case 0:
379     case (sizeof(eint)/sizeof(int) == ERRCOUNT):
380     return REG_ASSERT;
381     /* ========================================================================== */
382    
383     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
384     case PCRE_ERROR_NULL: return REG_INVARG;
385     case PCRE_ERROR_BADOPTION: return REG_INVARG;
386     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
387     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
388     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
389     case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
390     case PCRE_ERROR_BADUTF8: return REG_INVARG;
391     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
392     default: return REG_ASSERT;
393 nigel 3 }
394     }
395    
396     /* End of pcreposix.c */

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