/[pcre]/code/tags/pcre-2.06/pcreposix.c
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Contents of /code/tags/pcre-2.06/pcreposix.c

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Revision 36 - (show annotations) (download)
Sat Feb 24 21:39:07 2007 UTC (7 years, 6 months ago) by nigel
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Tag code/trunk as code/tags/pcre-2.06.

1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5 /*
6 This is a library of functions to support regular expressions whose syntax
7 and semantics are as close as possible to those of the Perl 5 language. See
8 the file Tech.Notes for some information on the internals.
9
10 This module is a wrapper that provides a POSIX API to the underlying PCRE
11 functions.
12
13 Written by: Philip Hazel <ph10@cam.ac.uk>
14
15 Copyright (c) 1997-1999 University of Cambridge
16
17 -----------------------------------------------------------------------------
18 Permission is granted to anyone to use this software for any purpose on any
19 computer system, and to redistribute it freely, subject to the following
20 restrictions:
21
22 1. This software is distributed in the hope that it will be useful,
23 but WITHOUT ANY WARRANTY; without even the implied warranty of
24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
25
26 2. The origin of this software must not be misrepresented, either by
27 explicit claim or by omission.
28
29 3. Altered versions must be plainly marked as such, and must not be
30 misrepresented as being the original software.
31
32 4. If PCRE is embedded in any software that is released under the GNU
33 General Purpose Licence (GPL), then the terms of that licence shall
34 supersede any condition above with which it is incompatible.
35 -----------------------------------------------------------------------------
36 */
37
38 #include "internal.h"
39 #include "pcreposix.h"
40 #include "stdlib.h"
41
42
43
44 /* Corresponding tables of PCRE error messages and POSIX error codes. */
45
46 static const char *estring[] = {
47 ERR1, ERR2, ERR3, ERR4, ERR5, ERR6, ERR7, ERR8, ERR9, ERR10,
48 ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,
49 ERR21, ERR22, ERR23, ERR24, ERR25 };
50
51 static int eint[] = {
52 REG_EESCAPE, /* "\\ at end of pattern" */
53 REG_EESCAPE, /* "\\c at end of pattern" */
54 REG_EESCAPE, /* "unrecognized character follows \\" */
55 REG_BADBR, /* "numbers out of order in {} quantifier" */
56 REG_BADBR, /* "number too big in {} quantifier" */
57 REG_EBRACK, /* "missing terminating ] for character class" */
58 REG_ECTYPE, /* "invalid escape sequence in character class" */
59 REG_ERANGE, /* "range out of order in character class" */
60 REG_BADRPT, /* "nothing to repeat" */
61 REG_BADRPT, /* "operand of unlimited repeat could match the empty string" */
62 REG_ASSERT, /* "internal error: unexpected repeat" */
63 REG_BADPAT, /* "unrecognized character after (?" */
64 REG_ESIZE, /* "too many capturing parenthesized sub-patterns" */
65 REG_EPAREN, /* "missing )" */
66 REG_ESUBREG, /* "back reference to non-existent subpattern" */
67 REG_INVARG, /* "erroffset passed as NULL" */
68 REG_INVARG, /* "unknown option bit(s) set" */
69 REG_EPAREN, /* "missing ) after comment" */
70 REG_ESIZE, /* "too many sets of parentheses" */
71 REG_ESIZE, /* "regular expression too large" */
72 REG_ESPACE, /* "failed to get memory" */
73 REG_EPAREN, /* "unmatched brackets" */
74 REG_ASSERT, /* "internal error: code overflow" */
75 REG_BADPAT, /* "unrecognized character after (?<" */
76 REG_BADPAT, /* "lookbehind assertion is not fixed length" */
77 REG_BADPAT, /* "malformed number after (?(" */
78 REG_BADPAT, /* "conditional group containe more than two branches" */
79 REG_BADPAT /* "assertion expected after (?(" */
80 };
81
82 /* Table of texts corresponding to POSIX error codes */
83
84 static const char *pstring[] = {
85 "", /* Dummy for value 0 */
86 "internal error", /* REG_ASSERT */
87 "invalid repeat counts in {}", /* BADBR */
88 "pattern error", /* BADPAT */
89 "? * + invalid", /* BADRPT */
90 "unbalanced {}", /* EBRACE */
91 "unbalanced []", /* EBRACK */
92 "collation error - not relevant", /* ECOLLATE */
93 "bad class", /* ECTYPE */
94 "bad escape sequence", /* EESCAPE */
95 "empty expression", /* EMPTY */
96 "unbalanced ()", /* EPAREN */
97 "bad range inside []", /* ERANGE */
98 "expression too big", /* ESIZE */
99 "failed to get memory", /* ESPACE */
100 "bad back reference", /* ESUBREG */
101 "bad argument", /* INVARG */
102 "match failed" /* NOMATCH */
103 };
104
105
106
107
108 /*************************************************
109 * Translate PCRE text code to int *
110 *************************************************/
111
112 /* PCRE compile-time errors are given as strings defined as macros. We can just
113 look them up in a table to turn them into POSIX-style error codes. */
114
115 static int
116 pcre_posix_error_code(const char *s)
117 {
118 size_t i;
119 for (i = 0; i < sizeof(estring)/sizeof(char *); i++)
120 if (strcmp(s, estring[i]) == 0) return eint[i];
121 return REG_ASSERT;
122 }
123
124
125
126 /*************************************************
127 * Translate error code to string *
128 *************************************************/
129
130 size_t
131 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
132 {
133 const char *message, *addmessage;
134 size_t length, addlength;
135
136 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
137 "unknown error code" : pstring[errcode];
138 length = strlen(message) + 1;
139
140 addmessage = " at offset ";
141 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
142 strlen(addmessage) + 6 : 0;
143
144 if (errbuf_size > 0)
145 {
146 if (addlength > 0 && errbuf_size >= length + addlength)
147 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
148 else
149 {
150 strncpy(errbuf, message, errbuf_size - 1);
151 errbuf[errbuf_size-1] = 0;
152 }
153 }
154
155 return length + addlength;
156 }
157
158
159
160
161 /*************************************************
162 * Free store held by a regex *
163 *************************************************/
164
165 void
166 regfree(regex_t *preg)
167 {
168 (pcre_free)(preg->re_pcre);
169 }
170
171
172
173
174 /*************************************************
175 * Compile a regular expression *
176 *************************************************/
177
178 /*
179 Arguments:
180 preg points to a structure for recording the compiled expression
181 pattern the pattern to compile
182 cflags compilation flags
183
184 Returns: 0 on success
185 various non-zero codes on failure
186 */
187
188 int
189 regcomp(regex_t *preg, const char *pattern, int cflags)
190 {
191 const char *errorptr;
192 int erroffset;
193 int options = 0;
194
195 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
196 if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
197
198 preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);
199 preg->re_erroffset = erroffset;
200
201 if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);
202
203 preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);
204 return 0;
205 }
206
207
208
209
210 /*************************************************
211 * Match a regular expression *
212 *************************************************/
213
214 int
215 regexec(regex_t *preg, const char *string, size_t nmatch,
216 regmatch_t pmatch[], int eflags)
217 {
218 int rc;
219 int options = 0;
220
221 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
222 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
223
224 preg->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
225
226 rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), 0, options,
227 (int *)pmatch, nmatch * 2);
228
229 if (rc == 0) return 0; /* All pmatch were filled in */
230
231 if (rc > 0)
232 {
233 size_t i;
234 for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
235 return 0;
236 }
237
238 else switch(rc)
239 {
240 case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
241 case PCRE_ERROR_NULL: return REG_INVARG;
242 case PCRE_ERROR_BADOPTION: return REG_INVARG;
243 case PCRE_ERROR_BADMAGIC: return REG_INVARG;
244 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
245 case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
246 default: return REG_ASSERT;
247 }
248 }
249
250 /* End of pcreposix.c */

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