1
/*************************************************
2
* Perl-Compatible Regular Expressions *
3
*************************************************/
5
/* 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.
8
Written by Philip Hazel
9
Copyright (c) 1997-2005 University of Cambridge
11
-----------------------------------------------------------------------------
12
Redistribution and use in source and binary forms, with or without
13
modification, are permitted provided that the following conditions are met:
15
* Redistributions of source code must retain the above copyright notice,
16
this list of conditions and the following disclaimer.
18
* 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.
22
* 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.
26
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
-----------------------------------------------------------------------------
41
/* This module is a wrapper that provides a POSIX API to the underlying PCRE
45
#include "pcre_internal.h"
46
#include "pcreposix.h"
51
/* Table to translate PCRE compile time error codes into POSIX error codes. */
53
static const int eint[] = {
55
REG_EESCAPE, /* \ at end of pattern */
56
REG_EESCAPE, /* \c at end of pattern */
57
REG_EESCAPE, /* unrecognized character follows \ */
58
REG_BADBR, /* numbers out of order in {} quantifier */
59
REG_BADBR, /* number too big in {} quantifier */
60
REG_EBRACK, /* missing terminating ] for character class */
61
REG_ECTYPE, /* invalid escape sequence in character class */
62
REG_ERANGE, /* range out of order in character class */
63
REG_BADRPT, /* nothing to repeat */
64
REG_BADRPT, /* operand of unlimited repeat could match the empty string */
65
REG_ASSERT, /* internal error: unexpected repeat */
66
REG_BADPAT, /* unrecognized character after (? */
67
REG_BADPAT, /* POSIX named classes are supported only within a class */
68
REG_EPAREN, /* missing ) */
69
REG_ESUBREG, /* reference to non-existent subpattern */
70
REG_INVARG, /* erroffset passed as NULL */
71
REG_INVARG, /* unknown option bit(s) set */
72
REG_EPAREN, /* missing ) after comment */
73
REG_ESIZE, /* parentheses nested too deeply */
74
REG_ESIZE, /* regular expression too large */
75
REG_ESPACE, /* failed to get memory */
76
REG_EPAREN, /* unmatched brackets */
77
REG_ASSERT, /* internal error: code overflow */
78
REG_BADPAT, /* unrecognized character after (?< */
79
REG_BADPAT, /* lookbehind assertion is not fixed length */
80
REG_BADPAT, /* malformed number after (?( */
81
REG_BADPAT, /* conditional group containe more than two branches */
82
REG_BADPAT, /* assertion expected after (?( */
83
REG_BADPAT, /* (?R or (?digits must be followed by ) */
84
REG_ECTYPE, /* unknown POSIX class name */
85
REG_BADPAT, /* POSIX collating elements are not supported */
86
REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
87
REG_BADPAT, /* spare error */
88
REG_BADPAT, /* character value in \x{...} sequence is too large */
89
REG_BADPAT, /* invalid condition (?(0) */
90
REG_BADPAT, /* \C not allowed in lookbehind assertion */
91
REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
92
REG_BADPAT, /* number after (?C is > 255 */
93
REG_BADPAT, /* closing ) for (?C expected */
94
REG_BADPAT, /* recursive call could loop indefinitely */
95
REG_BADPAT, /* unrecognized character after (?P */
96
REG_BADPAT, /* syntax error after (?P */
97
REG_BADPAT, /* two named groups have the same name */
98
REG_BADPAT, /* invalid UTF-8 string */
99
REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
100
REG_BADPAT, /* malformed \P or \p sequence */
101
REG_BADPAT /* unknown property name after \P or \p */
104
/* Table of texts corresponding to POSIX error codes */
106
static const char *const pstring[] = {
107
"", /* Dummy for value 0 */
108
"internal error", /* REG_ASSERT */
109
"invalid repeat counts in {}", /* BADBR */
110
"pattern error", /* BADPAT */
111
"? * + invalid", /* BADRPT */
112
"unbalanced {}", /* EBRACE */
113
"unbalanced []", /* EBRACK */
114
"collation error - not relevant", /* ECOLLATE */
115
"bad class", /* ECTYPE */
116
"bad escape sequence", /* EESCAPE */
117
"empty expression", /* EMPTY */
118
"unbalanced ()", /* EPAREN */
119
"bad range inside []", /* ERANGE */
120
"expression too big", /* ESIZE */
121
"failed to get memory", /* ESPACE */
122
"bad back reference", /* ESUBREG */
123
"bad argument", /* INVARG */
124
"match failed" /* NOMATCH */
130
/*************************************************
131
* Translate error code to string *
132
*************************************************/
135
regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
137
const char *message, *addmessage;
138
size_t length, addlength;
140
message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
141
"unknown error code" : pstring[errcode];
142
length = strlen(message) + 1;
144
addmessage = " at offset ";
145
addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
146
strlen(addmessage) + 6 : 0;
150
if (addlength > 0 && errbuf_size >= length + addlength)
151
sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
154
strncpy(errbuf, message, errbuf_size - 1);
155
errbuf[errbuf_size-1] = 0;
159
return length + addlength;
165
/*************************************************
166
* Free store held by a regex *
167
*************************************************/
170
regfree(regex_t *preg)
172
(pcre_free)(preg->re_pcre);
178
/*************************************************
179
* Compile a regular expression *
180
*************************************************/
184
preg points to a structure for recording the compiled expression
185
pattern the pattern to compile
186
cflags compilation flags
188
Returns: 0 on success
189
various non-zero codes on failure
193
regcomp(regex_t *preg, const char *pattern, int cflags)
195
const char *errorptr;
200
if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
201
if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
202
if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
204
preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
206
preg->re_erroffset = erroffset;
208
if (preg->re_pcre == NULL) return eint[errorcode];
210
preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
217
/*************************************************
218
* Match a regular expression *
219
*************************************************/
221
/* Unfortunately, PCRE requires 3 ints of working space for each captured
222
substring, so we have to get and release working store instead of just using
223
the POSIX structures as was done in earlier releases when PCRE needed only 2
224
ints. However, if the number of possible capturing brackets is small, use a
225
block of store on the stack, to reduce the use of malloc/free. The threshold is
226
in a macro that can be changed at configure time. */
229
regexec(const regex_t *preg, const char *string, size_t nmatch,
230
regmatch_t pmatch[], int eflags)
235
int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
236
BOOL allocated_ovector = FALSE;
238
if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
239
if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
241
((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
245
if (nmatch <= POSIX_MALLOC_THRESHOLD)
247
ovector = &(small_ovector[0]);
251
ovector = (int *)malloc(sizeof(int) * nmatch * 3);
252
if (ovector == NULL) return REG_ESPACE;
253
allocated_ovector = TRUE;
257
rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
258
0, options, ovector, nmatch * 3);
260
if (rc == 0) rc = nmatch; /* All captured slots were filled in */
265
for (i = 0; i < (size_t)rc; i++)
267
pmatch[i].rm_so = ovector[i*2];
268
pmatch[i].rm_eo = ovector[i*2+1];
270
if (allocated_ovector) free(ovector);
271
for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
277
if (allocated_ovector) free(ovector);
280
case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
281
case PCRE_ERROR_NULL: return REG_INVARG;
282
case PCRE_ERROR_BADOPTION: return REG_INVARG;
283
case PCRE_ERROR_BADMAGIC: return REG_INVARG;
284
case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
285
case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
286
case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
287
case PCRE_ERROR_BADUTF8: return REG_INVARG;
288
case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
289
default: return REG_ASSERT;
294
/* End of pcreposix.c */