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Revision 758 - (hide annotations) (download)
Mon Nov 21 12:05:36 2011 UTC (2 years, 4 months ago) by ph10
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Disallow \N in character classes, for Perl compatibility.

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 ph10 758 REG_BADPAT, /* \N is not supported in a class */
159 nigel 3 };
160    
161     /* Table of texts corresponding to POSIX error codes */
162    
163 nigel 73 static const char *const pstring[] = {
164 nigel 3 "", /* Dummy for value 0 */
165     "internal error", /* REG_ASSERT */
166     "invalid repeat counts in {}", /* BADBR */
167     "pattern error", /* BADPAT */
168     "? * + invalid", /* BADRPT */
169     "unbalanced {}", /* EBRACE */
170     "unbalanced []", /* EBRACK */
171     "collation error - not relevant", /* ECOLLATE */
172     "bad class", /* ECTYPE */
173     "bad escape sequence", /* EESCAPE */
174     "empty expression", /* EMPTY */
175     "unbalanced ()", /* EPAREN */
176     "bad range inside []", /* ERANGE */
177     "expression too big", /* ESIZE */
178     "failed to get memory", /* ESPACE */
179     "bad back reference", /* ESUBREG */
180     "bad argument", /* INVARG */
181     "match failed" /* NOMATCH */
182     };
183    
184    
185    
186    
187     /*************************************************
188     * Translate error code to string *
189     *************************************************/
190    
191 ph10 359 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
192 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
193     {
194 nigel 7 const char *message, *addmessage;
195     size_t length, addlength;
196 nigel 3
197 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
198 nigel 3 "unknown error code" : pstring[errcode];
199 nigel 7 length = strlen(message) + 1;
200 nigel 3
201 nigel 7 addmessage = " at offset ";
202     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
203     strlen(addmessage) + 6 : 0;
204 nigel 3
205     if (errbuf_size > 0)
206     {
207 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
208 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
209 nigel 3 else
210     {
211     strncpy(errbuf, message, errbuf_size - 1);
212     errbuf[errbuf_size-1] = 0;
213     }
214     }
215    
216 nigel 7 return length + addlength;
217 nigel 3 }
218    
219    
220    
221    
222     /*************************************************
223     * Free store held by a regex *
224     *************************************************/
225    
226 ph10 359 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
227 nigel 3 regfree(regex_t *preg)
228     {
229     (pcre_free)(preg->re_pcre);
230     }
231    
232    
233    
234    
235     /*************************************************
236     * Compile a regular expression *
237     *************************************************/
238    
239     /*
240     Arguments:
241     preg points to a structure for recording the compiled expression
242     pattern the pattern to compile
243     cflags compilation flags
244    
245     Returns: 0 on success
246     various non-zero codes on failure
247     */
248    
249 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
250 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
251     {
252 nigel 7 const char *errorptr;
253 nigel 3 int erroffset;
254 nigel 77 int errorcode;
255 nigel 3 int options = 0;
256    
257 ph10 432 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
258     if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
259     if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
260     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
261     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
262 ph10 518 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
263 ph10 432 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
264 nigel 3
265 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
266     &erroffset, NULL);
267 nigel 3 preg->re_erroffset = erroffset;
268    
269 ph10 461 /* Safety: if the error code is too big for the translation vector (which
270 ph10 418 should not happen, but we all make mistakes), return REG_BADPAT. */
271 nigel 3
272 ph10 461 if (preg->re_pcre == NULL)
273 ph10 418 {
274     return (errorcode < sizeof(eint)/sizeof(const int))?
275     eint[errorcode] : REG_BADPAT;
276 ph10 461 }
277 ph10 418
278 nigel 71 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
279 nigel 3 return 0;
280     }
281    
282    
283    
284    
285     /*************************************************
286     * Match a regular expression *
287     *************************************************/
288    
289 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
290     substring, so we have to get and release working store instead of just using
291     the POSIX structures as was done in earlier releases when PCRE needed only 2
292 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
293     block of store on the stack, to reduce the use of malloc/free. The threshold is
294 nigel 87 in a macro that can be changed at configure time.
295 nigel 41
296 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
297     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
298     the only result is yes/no/error. */
299    
300 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
301 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
302 nigel 3 regmatch_t pmatch[], int eflags)
303     {
304 ph10 332 int rc, so, eo;
305 nigel 3 int options = 0;
306 nigel 41 int *ovector = NULL;
307 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
308     BOOL allocated_ovector = FALSE;
309 nigel 87 BOOL nosub =
310     (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
311 nigel 3
312     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
313     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
314 ph10 388 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
315 nigel 3
316 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
317 nigel 3
318 ph10 461 /* When no string data is being returned, or no vector has been passed in which
319 ph10 432 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
320     the return data is large enough. */
321 nigel 87
322 ph10 432 if (nosub || pmatch == NULL) nmatch = 0;
323 nigel 87
324     else if (nmatch > 0)
325 nigel 41 {
326 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
327     {
328     ovector = &(small_ovector[0]);
329     }
330     else
331     {
332 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
333 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
334     if (ovector == NULL) return REG_ESPACE;
335     allocated_ovector = TRUE;
336     }
337 nigel 41 }
338    
339 ph10 332 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
340     The man page from OS X says "REG_STARTEND affects only the location of the
341 ph10 345 string, not how it is matched". That is why the "so" value is used to bump the
342 ph10 332 start location rather than being passed as a PCRE "starting offset". */
343    
344 ph10 345 if ((eflags & REG_STARTEND) != 0)
345 ph10 332 {
346     so = pmatch[0].rm_so;
347     eo = pmatch[0].rm_eo;
348 ph10 345 }
349     else
350 ph10 332 {
351     so = 0;
352 ph10 530 eo = (int)strlen(string);
353 ph10 332 }
354    
355     rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
356 ph10 530 0, options, ovector, (int)(nmatch * 3));
357 nigel 3
358 ph10 530 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
359 nigel 3
360 ph10 499 /* Successful match */
361    
362 nigel 41 if (rc >= 0)
363 nigel 3 {
364 nigel 7 size_t i;
365 nigel 87 if (!nosub)
366 nigel 41 {
367 nigel 87 for (i = 0; i < (size_t)rc; i++)
368     {
369     pmatch[i].rm_so = ovector[i*2];
370     pmatch[i].rm_eo = ovector[i*2+1];
371     }
372     if (allocated_ovector) free(ovector);
373     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
374 nigel 41 }
375 nigel 3 return 0;
376     }
377    
378 ph10 499 /* Unsuccessful match */
379    
380     if (allocated_ovector) free(ovector);
381     switch(rc)
382 nigel 3 {
383 ph10 499 /* ========================================================================== */
384     /* These cases are never obeyed. This is a fudge that causes a compile-time
385     error if the vector eint, which is indexed by compile-time error number, is
386     not the correct length. It seems to be the only way to do such a check at
387     compile time, as the sizeof() operator does not work in the C preprocessor.
388 ph10 507 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
389 ph10 499
390     case 0:
391     case (sizeof(eint)/sizeof(int) == ERRCOUNT):
392     return REG_ASSERT;
393     /* ========================================================================== */
394    
395     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
396     case PCRE_ERROR_NULL: return REG_INVARG;
397     case PCRE_ERROR_BADOPTION: return REG_INVARG;
398     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
399     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
400     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
401     case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
402     case PCRE_ERROR_BADUTF8: return REG_INVARG;
403     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
404     default: return REG_ASSERT;
405 nigel 3 }
406     }
407    
408     /* End of pcreposix.c */

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