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

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Revision 336 - (hide annotations) (download)
Sat Apr 12 15:59:03 2008 UTC (6 years, 7 months ago) by ph10
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File size: 13006 byte(s)
Added PCRE_JAVASCRIPT_COMPAT option.

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 305 Copyright (c) 1997-2008 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     REG_BADBR, /* number too big in {} quantifier */
74     REG_EBRACK, /* missing terminating ] for character class */
75     REG_ECTYPE, /* invalid escape sequence in character class */
76     REG_ERANGE, /* range out of order in character class */
77     REG_BADRPT, /* nothing to repeat */
78     REG_BADRPT, /* operand of unlimited repeat could match the empty string */
79     REG_ASSERT, /* internal error: unexpected repeat */
80     REG_BADPAT, /* unrecognized character after (? */
81     REG_BADPAT, /* POSIX named classes are supported only within a class */
82     REG_EPAREN, /* missing ) */
83     REG_ESUBREG, /* reference to non-existent subpattern */
84     REG_INVARG, /* erroffset passed as NULL */
85     REG_INVARG, /* unknown option bit(s) set */
86     REG_EPAREN, /* missing ) after comment */
87     REG_ESIZE, /* parentheses nested too deeply */
88     REG_ESIZE, /* regular expression too large */
89     REG_ESPACE, /* failed to get memory */
90     REG_EPAREN, /* unmatched brackets */
91     REG_ASSERT, /* internal error: code overflow */
92     REG_BADPAT, /* unrecognized character after (?< */
93     REG_BADPAT, /* lookbehind assertion is not fixed length */
94 nigel 91 REG_BADPAT, /* malformed number or name after (?( */
95 nigel 93 REG_BADPAT, /* conditional group contains more than two branches */
96 nigel 77 REG_BADPAT, /* assertion expected after (?( */
97 ph10 166 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
98 nigel 77 REG_ECTYPE, /* unknown POSIX class name */
99     REG_BADPAT, /* POSIX collating elements are not supported */
100     REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
101     REG_BADPAT, /* spare error */
102     REG_BADPAT, /* character value in \x{...} sequence is too large */
103     REG_BADPAT, /* invalid condition (?(0) */
104     REG_BADPAT, /* \C not allowed in lookbehind assertion */
105     REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
106     REG_BADPAT, /* number after (?C is > 255 */
107     REG_BADPAT, /* closing ) for (?C expected */
108     REG_BADPAT, /* recursive call could loop indefinitely */
109     REG_BADPAT, /* unrecognized character after (?P */
110 nigel 93 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
111 nigel 91 REG_BADPAT, /* two named subpatterns have the same name */
112 nigel 77 REG_BADPAT, /* invalid UTF-8 string */
113     REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
114     REG_BADPAT, /* malformed \P or \p sequence */
115 nigel 91 REG_BADPAT, /* unknown property name after \P or \p */
116     REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
117     REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
118     REG_BADPAT, /* repeated subpattern is too long */
119 nigel 93 REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
120     REG_BADPAT, /* internal error: overran compiling workspace */
121     REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
122     REG_BADPAT, /* DEFINE group contains more than one branch */
123     REG_BADPAT, /* repeating a DEFINE group is not allowed */
124     REG_INVARG, /* inconsistent NEWLINE options */
125 ph10 166 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
126 ph10 213 REG_BADPAT, /* (?+ or (?- must be followed by a non-zero number */
127 ph10 268 REG_BADPAT, /* number is too big */
128 ph10 286 REG_BADPAT, /* subpattern name expected */
129 ph10 336 REG_BADPAT, /* digit expected after (?+ */
130     REG_BADPAT /* ] is an invalid data character in JavaScript compatibility mode */
131 nigel 3 };
132    
133     /* Table of texts corresponding to POSIX error codes */
134    
135 nigel 73 static const char *const pstring[] = {
136 nigel 3 "", /* Dummy for value 0 */
137     "internal error", /* REG_ASSERT */
138     "invalid repeat counts in {}", /* BADBR */
139     "pattern error", /* BADPAT */
140     "? * + invalid", /* BADRPT */
141     "unbalanced {}", /* EBRACE */
142     "unbalanced []", /* EBRACK */
143     "collation error - not relevant", /* ECOLLATE */
144     "bad class", /* ECTYPE */
145     "bad escape sequence", /* EESCAPE */
146     "empty expression", /* EMPTY */
147     "unbalanced ()", /* EPAREN */
148     "bad range inside []", /* ERANGE */
149     "expression too big", /* ESIZE */
150     "failed to get memory", /* ESPACE */
151     "bad back reference", /* ESUBREG */
152     "bad argument", /* INVARG */
153     "match failed" /* NOMATCH */
154     };
155    
156    
157    
158    
159     /*************************************************
160     * Translate error code to string *
161     *************************************************/
162    
163 ph10 145 PCREPOSIX_EXP_DEFN size_t
164 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
165     {
166 nigel 7 const char *message, *addmessage;
167     size_t length, addlength;
168 nigel 3
169 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
170 nigel 3 "unknown error code" : pstring[errcode];
171 nigel 7 length = strlen(message) + 1;
172 nigel 3
173 nigel 7 addmessage = " at offset ";
174     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
175     strlen(addmessage) + 6 : 0;
176 nigel 3
177     if (errbuf_size > 0)
178     {
179 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
180 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
181 nigel 3 else
182     {
183     strncpy(errbuf, message, errbuf_size - 1);
184     errbuf[errbuf_size-1] = 0;
185     }
186     }
187    
188 nigel 7 return length + addlength;
189 nigel 3 }
190    
191    
192    
193    
194     /*************************************************
195     * Free store held by a regex *
196     *************************************************/
197    
198 ph10 145 PCREPOSIX_EXP_DEFN void
199 nigel 3 regfree(regex_t *preg)
200     {
201     (pcre_free)(preg->re_pcre);
202     }
203    
204    
205    
206    
207     /*************************************************
208     * Compile a regular expression *
209     *************************************************/
210    
211     /*
212     Arguments:
213     preg points to a structure for recording the compiled expression
214     pattern the pattern to compile
215     cflags compilation flags
216    
217     Returns: 0 on success
218     various non-zero codes on failure
219     */
220    
221 ph10 145 PCREPOSIX_EXP_DEFN int
222 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
223     {
224 nigel 7 const char *errorptr;
225 nigel 3 int erroffset;
226 nigel 77 int errorcode;
227 nigel 3 int options = 0;
228    
229 nigel 87 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
230 nigel 3 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
231 nigel 87 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
232     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
233     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
234 nigel 3
235 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
236     &erroffset, NULL);
237 nigel 3 preg->re_erroffset = erroffset;
238    
239 nigel 77 if (preg->re_pcre == NULL) return eint[errorcode];
240 nigel 3
241 nigel 71 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
242 nigel 3 return 0;
243     }
244    
245    
246    
247    
248     /*************************************************
249     * Match a regular expression *
250     *************************************************/
251    
252 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
253     substring, so we have to get and release working store instead of just using
254     the POSIX structures as was done in earlier releases when PCRE needed only 2
255 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
256     block of store on the stack, to reduce the use of malloc/free. The threshold is
257 nigel 87 in a macro that can be changed at configure time.
258 nigel 41
259 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
260     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
261     the only result is yes/no/error. */
262    
263 ph10 145 PCREPOSIX_EXP_DEFN int
264 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
265 nigel 3 regmatch_t pmatch[], int eflags)
266     {
267 ph10 332 int rc, so, eo;
268 nigel 3 int options = 0;
269 nigel 41 int *ovector = NULL;
270 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
271     BOOL allocated_ovector = FALSE;
272 nigel 87 BOOL nosub =
273     (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
274 nigel 3
275     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
276     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
277    
278 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
279 nigel 3
280 nigel 87 /* When no string data is being returned, ensure that nmatch is zero.
281     Otherwise, ensure the vector for holding the return data is large enough. */
282    
283     if (nosub) nmatch = 0;
284    
285     else if (nmatch > 0)
286 nigel 41 {
287 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
288     {
289     ovector = &(small_ovector[0]);
290     }
291     else
292     {
293 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
294 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
295     if (ovector == NULL) return REG_ESPACE;
296     allocated_ovector = TRUE;
297     }
298 nigel 41 }
299    
300 ph10 332 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
301     The man page from OS X says "REG_STARTEND affects only the location of the
302     string, not how it is matched". That is why the "so" value is used to bump the
303     start location rather than being passed as a PCRE "starting offset". */
304    
305     if ((eflags & REG_STARTEND) != 0)
306     {
307     so = pmatch[0].rm_so;
308     eo = pmatch[0].rm_eo;
309     }
310     else
311     {
312     so = 0;
313     eo = strlen(string);
314     }
315    
316     rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
317 nigel 71 0, options, ovector, nmatch * 3);
318 nigel 3
319 nigel 41 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
320 nigel 3
321 nigel 41 if (rc >= 0)
322 nigel 3 {
323 nigel 7 size_t i;
324 nigel 87 if (!nosub)
325 nigel 41 {
326 nigel 87 for (i = 0; i < (size_t)rc; i++)
327     {
328     pmatch[i].rm_so = ovector[i*2];
329     pmatch[i].rm_eo = ovector[i*2+1];
330     }
331     if (allocated_ovector) free(ovector);
332     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
333 nigel 41 }
334 nigel 3 return 0;
335     }
336    
337 nigel 41 else
338 nigel 3 {
339 nigel 63 if (allocated_ovector) free(ovector);
340 nigel 41 switch(rc)
341     {
342     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
343     case PCRE_ERROR_NULL: return REG_INVARG;
344     case PCRE_ERROR_BADOPTION: return REG_INVARG;
345     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
346     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
347     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
348 nigel 73 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
349     case PCRE_ERROR_BADUTF8: return REG_INVARG;
350     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
351 nigel 41 default: return REG_ASSERT;
352     }
353 nigel 3 }
354     }
355    
356     /* End of pcreposix.c */

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