/[pcre]/code/trunk/pcreposix.c
ViewVC logotype

Contents of /code/trunk/pcreposix.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 286 - (hide annotations) (download)
Mon Dec 17 14:46:11 2007 UTC (6 years, 10 months ago) by ph10
File MIME type: text/plain
File size: 12473 byte(s)
Add .gz and .bz2 optional support to pcregrep.

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 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     REG_BADPAT /* digit expected after (?+ */
130 nigel 3 };
131    
132     /* Table of texts corresponding to POSIX error codes */
133    
134 nigel 73 static const char *const pstring[] = {
135 nigel 3 "", /* Dummy for value 0 */
136     "internal error", /* REG_ASSERT */
137     "invalid repeat counts in {}", /* BADBR */
138     "pattern error", /* BADPAT */
139     "? * + invalid", /* BADRPT */
140     "unbalanced {}", /* EBRACE */
141     "unbalanced []", /* EBRACK */
142     "collation error - not relevant", /* ECOLLATE */
143     "bad class", /* ECTYPE */
144     "bad escape sequence", /* EESCAPE */
145     "empty expression", /* EMPTY */
146     "unbalanced ()", /* EPAREN */
147     "bad range inside []", /* ERANGE */
148     "expression too big", /* ESIZE */
149     "failed to get memory", /* ESPACE */
150     "bad back reference", /* ESUBREG */
151     "bad argument", /* INVARG */
152     "match failed" /* NOMATCH */
153     };
154    
155    
156    
157    
158     /*************************************************
159     * Translate error code to string *
160     *************************************************/
161    
162 ph10 145 PCREPOSIX_EXP_DEFN size_t
163 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
164     {
165 nigel 7 const char *message, *addmessage;
166     size_t length, addlength;
167 nigel 3
168 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
169 nigel 3 "unknown error code" : pstring[errcode];
170 nigel 7 length = strlen(message) + 1;
171 nigel 3
172 nigel 7 addmessage = " at offset ";
173     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
174     strlen(addmessage) + 6 : 0;
175 nigel 3
176     if (errbuf_size > 0)
177     {
178 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
179 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
180 nigel 3 else
181     {
182     strncpy(errbuf, message, errbuf_size - 1);
183     errbuf[errbuf_size-1] = 0;
184     }
185     }
186    
187 nigel 7 return length + addlength;
188 nigel 3 }
189    
190    
191    
192    
193     /*************************************************
194     * Free store held by a regex *
195     *************************************************/
196    
197 ph10 145 PCREPOSIX_EXP_DEFN void
198 nigel 3 regfree(regex_t *preg)
199     {
200     (pcre_free)(preg->re_pcre);
201     }
202    
203    
204    
205    
206     /*************************************************
207     * Compile a regular expression *
208     *************************************************/
209    
210     /*
211     Arguments:
212     preg points to a structure for recording the compiled expression
213     pattern the pattern to compile
214     cflags compilation flags
215    
216     Returns: 0 on success
217     various non-zero codes on failure
218     */
219    
220 ph10 145 PCREPOSIX_EXP_DEFN int
221 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
222     {
223 nigel 7 const char *errorptr;
224 nigel 3 int erroffset;
225 nigel 77 int errorcode;
226 nigel 3 int options = 0;
227    
228 nigel 87 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
229 nigel 3 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
230 nigel 87 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
231     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
232     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
233 nigel 3
234 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
235     &erroffset, NULL);
236 nigel 3 preg->re_erroffset = erroffset;
237    
238 nigel 77 if (preg->re_pcre == NULL) return eint[errorcode];
239 nigel 3
240 nigel 71 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
241 nigel 3 return 0;
242     }
243    
244    
245    
246    
247     /*************************************************
248     * Match a regular expression *
249     *************************************************/
250    
251 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
252     substring, so we have to get and release working store instead of just using
253     the POSIX structures as was done in earlier releases when PCRE needed only 2
254 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
255     block of store on the stack, to reduce the use of malloc/free. The threshold is
256 nigel 87 in a macro that can be changed at configure time.
257 nigel 41
258 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
259     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
260     the only result is yes/no/error. */
261    
262 ph10 145 PCREPOSIX_EXP_DEFN int
263 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
264 nigel 3 regmatch_t pmatch[], int eflags)
265     {
266     int rc;
267     int options = 0;
268 nigel 41 int *ovector = NULL;
269 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
270     BOOL allocated_ovector = FALSE;
271 nigel 87 BOOL nosub =
272     (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
273 nigel 3
274     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
275     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
276    
277 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
278 nigel 3
279 nigel 87 /* When no string data is being returned, ensure that nmatch is zero.
280     Otherwise, ensure the vector for holding the return data is large enough. */
281    
282     if (nosub) nmatch = 0;
283    
284     else if (nmatch > 0)
285 nigel 41 {
286 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
287     {
288     ovector = &(small_ovector[0]);
289     }
290     else
291     {
292 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
293 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
294     if (ovector == NULL) return REG_ESPACE;
295     allocated_ovector = TRUE;
296     }
297 nigel 41 }
298    
299 nigel 71 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
300     0, options, ovector, nmatch * 3);
301 nigel 3
302 nigel 41 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
303 nigel 3
304 nigel 41 if (rc >= 0)
305 nigel 3 {
306 nigel 7 size_t i;
307 nigel 87 if (!nosub)
308 nigel 41 {
309 nigel 87 for (i = 0; i < (size_t)rc; i++)
310     {
311     pmatch[i].rm_so = ovector[i*2];
312     pmatch[i].rm_eo = ovector[i*2+1];
313     }
314     if (allocated_ovector) free(ovector);
315     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
316 nigel 41 }
317 nigel 3 return 0;
318     }
319    
320 nigel 41 else
321 nigel 3 {
322 nigel 63 if (allocated_ovector) free(ovector);
323 nigel 41 switch(rc)
324     {
325     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
326     case PCRE_ERROR_NULL: return REG_INVARG;
327     case PCRE_ERROR_BADOPTION: return REG_INVARG;
328     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
329     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
330     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
331 nigel 73 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
332     case PCRE_ERROR_BADUTF8: return REG_INVARG;
333     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
334 nigel 41 default: return REG_ASSERT;
335     }
336 nigel 3 }
337     }
338    
339     /* End of pcreposix.c */

Properties

Name Value
svn:eol-style native
svn:keywords "Author Date Id Revision Url"

webmaster@exim.org
ViewVC Help
Powered by ViewVC 1.1.12