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

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Revision 199 - (hide annotations) (download)
Tue Jul 31 14:39:09 2007 UTC (7 years, 3 months ago) by ph10
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File size: 12414 byte(s)
Daniel's patch for config.h and Windows DLL declarations (not fully working).

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 199 #ifdef HAVE_CONFIG_H
46     #include <config.h>
47     #endif
48    
49    
50     /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51     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 nigel 77 #include "pcre_internal.h"
61 nigel 3 #include "pcreposix.h"
62    
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     REG_BADPAT /* (?+ or (?- must be followed by a non-zero number */
127 nigel 3 };
128    
129     /* Table of texts corresponding to POSIX error codes */
130    
131 nigel 73 static const char *const pstring[] = {
132 nigel 3 "", /* Dummy for value 0 */
133     "internal error", /* REG_ASSERT */
134     "invalid repeat counts in {}", /* BADBR */
135     "pattern error", /* BADPAT */
136     "? * + invalid", /* BADRPT */
137     "unbalanced {}", /* EBRACE */
138     "unbalanced []", /* EBRACK */
139     "collation error - not relevant", /* ECOLLATE */
140     "bad class", /* ECTYPE */
141     "bad escape sequence", /* EESCAPE */
142     "empty expression", /* EMPTY */
143     "unbalanced ()", /* EPAREN */
144     "bad range inside []", /* ERANGE */
145     "expression too big", /* ESIZE */
146     "failed to get memory", /* ESPACE */
147     "bad back reference", /* ESUBREG */
148     "bad argument", /* INVARG */
149     "match failed" /* NOMATCH */
150     };
151    
152    
153    
154    
155     /*************************************************
156     * Translate error code to string *
157     *************************************************/
158    
159 ph10 145 PCREPOSIX_EXP_DEFN size_t
160 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
161     {
162 nigel 7 const char *message, *addmessage;
163     size_t length, addlength;
164 nigel 3
165 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
166 nigel 3 "unknown error code" : pstring[errcode];
167 nigel 7 length = strlen(message) + 1;
168 nigel 3
169 nigel 7 addmessage = " at offset ";
170     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
171     strlen(addmessage) + 6 : 0;
172 nigel 3
173     if (errbuf_size > 0)
174     {
175 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
176 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
177 nigel 3 else
178     {
179     strncpy(errbuf, message, errbuf_size - 1);
180     errbuf[errbuf_size-1] = 0;
181     }
182     }
183    
184 nigel 7 return length + addlength;
185 nigel 3 }
186    
187    
188    
189    
190     /*************************************************
191     * Free store held by a regex *
192     *************************************************/
193    
194 ph10 145 PCREPOSIX_EXP_DEFN void
195 nigel 3 regfree(regex_t *preg)
196     {
197     (pcre_free)(preg->re_pcre);
198     }
199    
200    
201    
202    
203     /*************************************************
204     * Compile a regular expression *
205     *************************************************/
206    
207     /*
208     Arguments:
209     preg points to a structure for recording the compiled expression
210     pattern the pattern to compile
211     cflags compilation flags
212    
213     Returns: 0 on success
214     various non-zero codes on failure
215     */
216    
217 ph10 145 PCREPOSIX_EXP_DEFN int
218 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
219     {
220 nigel 7 const char *errorptr;
221 nigel 3 int erroffset;
222 nigel 77 int errorcode;
223 nigel 3 int options = 0;
224    
225 nigel 87 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
226 nigel 3 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
227 nigel 87 if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
228     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
229     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
230 nigel 3
231 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
232     &erroffset, NULL);
233 nigel 3 preg->re_erroffset = erroffset;
234    
235 nigel 77 if (preg->re_pcre == NULL) return eint[errorcode];
236 nigel 3
237 nigel 71 preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
238 nigel 3 return 0;
239     }
240    
241    
242    
243    
244     /*************************************************
245     * Match a regular expression *
246     *************************************************/
247    
248 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
249     substring, so we have to get and release working store instead of just using
250     the POSIX structures as was done in earlier releases when PCRE needed only 2
251 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
252     block of store on the stack, to reduce the use of malloc/free. The threshold is
253 nigel 87 in a macro that can be changed at configure time.
254 nigel 41
255 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
256     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
257     the only result is yes/no/error. */
258    
259 ph10 145 PCREPOSIX_EXP_DEFN int
260 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
261 nigel 3 regmatch_t pmatch[], int eflags)
262     {
263     int rc;
264     int options = 0;
265 nigel 41 int *ovector = NULL;
266 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
267     BOOL allocated_ovector = FALSE;
268 nigel 87 BOOL nosub =
269     (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
270 nigel 3
271     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
272     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
273    
274 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
275 nigel 3
276 nigel 87 /* When no string data is being returned, ensure that nmatch is zero.
277     Otherwise, ensure the vector for holding the return data is large enough. */
278    
279     if (nosub) nmatch = 0;
280    
281     else if (nmatch > 0)
282 nigel 41 {
283 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
284     {
285     ovector = &(small_ovector[0]);
286     }
287     else
288     {
289 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
290 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
291     if (ovector == NULL) return REG_ESPACE;
292     allocated_ovector = TRUE;
293     }
294 nigel 41 }
295    
296 nigel 71 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
297     0, options, ovector, nmatch * 3);
298 nigel 3
299 nigel 41 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
300 nigel 3
301 nigel 41 if (rc >= 0)
302 nigel 3 {
303 nigel 7 size_t i;
304 nigel 87 if (!nosub)
305 nigel 41 {
306 nigel 87 for (i = 0; i < (size_t)rc; i++)
307     {
308     pmatch[i].rm_so = ovector[i*2];
309     pmatch[i].rm_eo = ovector[i*2+1];
310     }
311     if (allocated_ovector) free(ovector);
312     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
313 nigel 41 }
314 nigel 3 return 0;
315     }
316    
317 nigel 41 else
318 nigel 3 {
319 nigel 63 if (allocated_ovector) free(ovector);
320 nigel 41 switch(rc)
321     {
322     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
323     case PCRE_ERROR_NULL: return REG_INVARG;
324     case PCRE_ERROR_BADOPTION: return REG_INVARG;
325     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
326     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
327     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
328 nigel 73 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
329     case PCRE_ERROR_BADUTF8: return REG_INVARG;
330     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
331 nigel 41 default: return REG_ASSERT;
332     }
333 nigel 3 }
334     }
335    
336     /* End of pcreposix.c */

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