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

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Revision 200 - (hide annotations) (download)
Wed Aug 1 09:10:40 2007 UTC (7 years, 4 months ago) by ph10
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File size: 12343 byte(s)
Correct errors in previous patch; tidy for test release.

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 117 Copyright (c) 1997-2007 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 199 #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 200 #include <pcre.h>
61 nigel 77 #include "pcre_internal.h"
62 nigel 3 #include "pcreposix.h"
63    
64    
65    
66 nigel 77 /* Table to translate PCRE compile time error codes into POSIX error codes. */
67 nigel 3
68 nigel 73 static const int eint[] = {
69 nigel 77 0, /* no error */
70     REG_EESCAPE, /* \ at end of pattern */
71     REG_EESCAPE, /* \c at end of pattern */
72     REG_EESCAPE, /* unrecognized character follows \ */
73     REG_BADBR, /* numbers out of order in {} quantifier */
74     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     REG_BADRPT, /* operand of unlimited repeat could match the empty string */
80     REG_ASSERT, /* internal error: unexpected repeat */
81     REG_BADPAT, /* unrecognized character after (? */
82     REG_BADPAT, /* POSIX named classes are supported only within a class */
83     REG_EPAREN, /* missing ) */
84     REG_ESUBREG, /* reference to non-existent subpattern */
85     REG_INVARG, /* erroffset passed as NULL */
86     REG_INVARG, /* unknown option bit(s) set */
87     REG_EPAREN, /* missing ) after comment */
88     REG_ESIZE, /* parentheses nested too deeply */
89     REG_ESIZE, /* regular expression too large */
90     REG_ESPACE, /* failed to get memory */
91     REG_EPAREN, /* unmatched brackets */
92     REG_ASSERT, /* internal error: code overflow */
93     REG_BADPAT, /* unrecognized character after (?< */
94     REG_BADPAT, /* lookbehind assertion is not fixed length */
95 nigel 91 REG_BADPAT, /* malformed number or name after (?( */
96 nigel 93 REG_BADPAT, /* conditional group contains more than two branches */
97 nigel 77 REG_BADPAT, /* assertion expected after (?( */
98 ph10 166 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
99 nigel 77 REG_ECTYPE, /* unknown POSIX class name */
100     REG_BADPAT, /* POSIX collating elements are not supported */
101     REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
102     REG_BADPAT, /* spare error */
103     REG_BADPAT, /* character value in \x{...} sequence is too large */
104     REG_BADPAT, /* invalid condition (?(0) */
105     REG_BADPAT, /* \C not allowed in lookbehind assertion */
106     REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
107     REG_BADPAT, /* number after (?C is > 255 */
108     REG_BADPAT, /* closing ) for (?C expected */
109     REG_BADPAT, /* recursive call could loop indefinitely */
110     REG_BADPAT, /* unrecognized character after (?P */
111 nigel 93 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
112 nigel 91 REG_BADPAT, /* two named subpatterns have the same name */
113 nigel 77 REG_BADPAT, /* invalid UTF-8 string */
114     REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
115     REG_BADPAT, /* malformed \P or \p sequence */
116 nigel 91 REG_BADPAT, /* unknown property name after \P or \p */
117     REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
118     REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
119     REG_BADPAT, /* repeated subpattern is too long */
120 nigel 93 REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
121     REG_BADPAT, /* internal error: overran compiling workspace */
122     REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
123     REG_BADPAT, /* DEFINE group contains more than one branch */
124     REG_BADPAT, /* repeating a DEFINE group is not allowed */
125     REG_INVARG, /* inconsistent NEWLINE options */
126 ph10 166 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
127     REG_BADPAT /* (?+ or (?- must be followed by a non-zero number */
128 nigel 3 };
129    
130     /* Table of texts corresponding to POSIX error codes */
131    
132 nigel 73 static const char *const pstring[] = {
133 nigel 3 "", /* Dummy for value 0 */
134     "internal error", /* REG_ASSERT */
135     "invalid repeat counts in {}", /* BADBR */
136     "pattern error", /* BADPAT */
137     "? * + invalid", /* BADRPT */
138     "unbalanced {}", /* EBRACE */
139     "unbalanced []", /* EBRACK */
140     "collation error - not relevant", /* ECOLLATE */
141     "bad class", /* ECTYPE */
142     "bad escape sequence", /* EESCAPE */
143     "empty expression", /* EMPTY */
144     "unbalanced ()", /* EPAREN */
145     "bad range inside []", /* ERANGE */
146     "expression too big", /* ESIZE */
147     "failed to get memory", /* ESPACE */
148     "bad back reference", /* ESUBREG */
149     "bad argument", /* INVARG */
150     "match failed" /* NOMATCH */
151     };
152    
153    
154    
155    
156     /*************************************************
157     * Translate error code to string *
158     *************************************************/
159    
160 ph10 145 PCREPOSIX_EXP_DEFN size_t
161 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
162     {
163 nigel 7 const char *message, *addmessage;
164     size_t length, addlength;
165 nigel 3
166 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
167 nigel 3 "unknown error code" : pstring[errcode];
168 nigel 7 length = strlen(message) + 1;
169 nigel 3
170 nigel 7 addmessage = " at offset ";
171     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
172     strlen(addmessage) + 6 : 0;
173 nigel 3
174     if (errbuf_size > 0)
175     {
176 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
177 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
178 nigel 3 else
179     {
180     strncpy(errbuf, message, errbuf_size - 1);
181     errbuf[errbuf_size-1] = 0;
182     }
183     }
184    
185 nigel 7 return length + addlength;
186 nigel 3 }
187    
188    
189    
190    
191     /*************************************************
192     * Free store held by a regex *
193     *************************************************/
194    
195 ph10 145 PCREPOSIX_EXP_DEFN void
196 nigel 3 regfree(regex_t *preg)
197     {
198     (pcre_free)(preg->re_pcre);
199     }
200    
201    
202    
203    
204     /*************************************************
205     * Compile a regular expression *
206     *************************************************/
207    
208     /*
209     Arguments:
210     preg points to a structure for recording the compiled expression
211     pattern the pattern to compile
212     cflags compilation flags
213    
214     Returns: 0 on success
215     various non-zero codes on failure
216     */
217    
218 ph10 145 PCREPOSIX_EXP_DEFN int
219 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
220     {
221 nigel 7 const char *errorptr;
222 nigel 3 int erroffset;
223 nigel 77 int errorcode;
224 nigel 3 int options = 0;
225    
226 nigel 87 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
227 nigel 3 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
228 nigel 87 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
229     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
230     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
231 nigel 3
232 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
233     &erroffset, NULL);
234 nigel 3 preg->re_erroffset = erroffset;
235    
236 nigel 77 if (preg->re_pcre == NULL) return eint[errorcode];
237 nigel 3
238 nigel 71 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
239 nigel 3 return 0;
240     }
241    
242    
243    
244    
245     /*************************************************
246     * Match a regular expression *
247     *************************************************/
248    
249 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
250     substring, so we have to get and release working store instead of just using
251     the POSIX structures as was done in earlier releases when PCRE needed only 2
252 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
253     block of store on the stack, to reduce the use of malloc/free. The threshold is
254 nigel 87 in a macro that can be changed at configure time.
255 nigel 41
256 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
257     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
258     the only result is yes/no/error. */
259    
260 ph10 145 PCREPOSIX_EXP_DEFN int
261 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
262 nigel 3 regmatch_t pmatch[], int eflags)
263     {
264     int rc;
265     int options = 0;
266 nigel 41 int *ovector = NULL;
267 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
268     BOOL allocated_ovector = FALSE;
269 nigel 87 BOOL nosub =
270     (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
271 nigel 3
272     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
273     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
274    
275 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
276 nigel 3
277 nigel 87 /* When no string data is being returned, ensure that nmatch is zero.
278     Otherwise, ensure the vector for holding the return data is large enough. */
279    
280     if (nosub) nmatch = 0;
281    
282     else if (nmatch > 0)
283 nigel 41 {
284 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
285     {
286     ovector = &(small_ovector[0]);
287     }
288     else
289     {
290 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
291 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
292     if (ovector == NULL) return REG_ESPACE;
293     allocated_ovector = TRUE;
294     }
295 nigel 41 }
296    
297 nigel 71 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
298     0, options, ovector, nmatch * 3);
299 nigel 3
300 nigel 41 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
301 nigel 3
302 nigel 41 if (rc >= 0)
303 nigel 3 {
304 nigel 7 size_t i;
305 nigel 87 if (!nosub)
306 nigel 41 {
307 nigel 87 for (i = 0; i < (size_t)rc; i++)
308     {
309     pmatch[i].rm_so = ovector[i*2];
310     pmatch[i].rm_eo = ovector[i*2+1];
311     }
312     if (allocated_ovector) free(ovector);
313     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
314 nigel 41 }
315 nigel 3 return 0;
316     }
317    
318 nigel 41 else
319 nigel 3 {
320 nigel 63 if (allocated_ovector) free(ovector);
321 nigel 41 switch(rc)
322     {
323     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
324     case PCRE_ERROR_NULL: return REG_INVARG;
325     case PCRE_ERROR_BADOPTION: return REG_INVARG;
326     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
327     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
328     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
329 nigel 73 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
330     case PCRE_ERROR_BADUTF8: return REG_INVARG;
331     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
332 nigel 41 default: return REG_ASSERT;
333     }
334 nigel 3 }
335     }
336    
337     /* End of pcreposix.c */

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