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

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Revision 43 - (hide annotations) (download)
Sat Feb 24 21:39:21 2007 UTC (7 years, 9 months ago) by nigel
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Load pcre-3.0 into code/trunk.

1 nigel 3 /*************************************************
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 nigel 43 Copyright (c) 1997-2000 University of Cambridge
16 nigel 3
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 nigel 29
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 nigel 3 -----------------------------------------------------------------------------
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 nigel 7 static const char *estring[] = {
47 nigel 3 ERR1, ERR2, ERR3, ERR4, ERR5, ERR6, ERR7, ERR8, ERR9, ERR10,
48     ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,
49 nigel 43 ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,
50     ERR31 };
51 nigel 3
52     static int eint[] = {
53     REG_EESCAPE, /* "\\ at end of pattern" */
54     REG_EESCAPE, /* "\\c at end of pattern" */
55     REG_EESCAPE, /* "unrecognized character follows \\" */
56     REG_BADBR, /* "numbers out of order in {} quantifier" */
57     REG_BADBR, /* "number too big in {} quantifier" */
58     REG_EBRACK, /* "missing terminating ] for character class" */
59     REG_ECTYPE, /* "invalid escape sequence in character class" */
60     REG_ERANGE, /* "range out of order in character class" */
61     REG_BADRPT, /* "nothing to repeat" */
62     REG_BADRPT, /* "operand of unlimited repeat could match the empty string" */
63     REG_ASSERT, /* "internal error: unexpected repeat" */
64     REG_BADPAT, /* "unrecognized character after (?" */
65     REG_ESIZE, /* "too many capturing parenthesized sub-patterns" */
66     REG_EPAREN, /* "missing )" */
67     REG_ESUBREG, /* "back reference to non-existent subpattern" */
68     REG_INVARG, /* "erroffset passed as NULL" */
69     REG_INVARG, /* "unknown option bit(s) set" */
70     REG_EPAREN, /* "missing ) after comment" */
71     REG_ESIZE, /* "too many sets of parentheses" */
72     REG_ESIZE, /* "regular expression too large" */
73     REG_ESPACE, /* "failed to get memory" */
74     REG_EPAREN, /* "unmatched brackets" */
75 nigel 23 REG_ASSERT, /* "internal error: code overflow" */
76     REG_BADPAT, /* "unrecognized character after (?<" */
77     REG_BADPAT, /* "lookbehind assertion is not fixed length" */
78     REG_BADPAT, /* "malformed number after (?(" */
79     REG_BADPAT, /* "conditional group containe more than two branches" */
80 nigel 43 REG_BADPAT, /* "assertion expected after (?(" */
81     REG_BADPAT, /* "(?p must be followed by )" */
82     REG_ECTYPE, /* "unknown POSIX class name" */
83     REG_BADPAT /* "POSIX collating elements are not supported" */
84 nigel 3 };
85    
86     /* Table of texts corresponding to POSIX error codes */
87    
88 nigel 7 static const char *pstring[] = {
89 nigel 3 "", /* Dummy for value 0 */
90     "internal error", /* REG_ASSERT */
91     "invalid repeat counts in {}", /* BADBR */
92     "pattern error", /* BADPAT */
93     "? * + invalid", /* BADRPT */
94     "unbalanced {}", /* EBRACE */
95     "unbalanced []", /* EBRACK */
96     "collation error - not relevant", /* ECOLLATE */
97     "bad class", /* ECTYPE */
98     "bad escape sequence", /* EESCAPE */
99     "empty expression", /* EMPTY */
100     "unbalanced ()", /* EPAREN */
101     "bad range inside []", /* ERANGE */
102     "expression too big", /* ESIZE */
103     "failed to get memory", /* ESPACE */
104     "bad back reference", /* ESUBREG */
105     "bad argument", /* INVARG */
106     "match failed" /* NOMATCH */
107     };
108    
109    
110    
111    
112     /*************************************************
113     * Translate PCRE text code to int *
114     *************************************************/
115    
116     /* PCRE compile-time errors are given as strings defined as macros. We can just
117     look them up in a table to turn them into POSIX-style error codes. */
118    
119     static int
120     pcre_posix_error_code(const char *s)
121     {
122 nigel 7 size_t i;
123 nigel 3 for (i = 0; i < sizeof(estring)/sizeof(char *); i++)
124     if (strcmp(s, estring[i]) == 0) return eint[i];
125     return REG_ASSERT;
126     }
127    
128    
129    
130     /*************************************************
131     * Translate error code to string *
132     *************************************************/
133    
134     size_t
135     regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
136     {
137 nigel 7 const char *message, *addmessage;
138     size_t length, addlength;
139 nigel 3
140 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
141 nigel 3 "unknown error code" : pstring[errcode];
142 nigel 7 length = strlen(message) + 1;
143 nigel 3
144 nigel 7 addmessage = " at offset ";
145     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
146     strlen(addmessage) + 6 : 0;
147 nigel 3
148     if (errbuf_size > 0)
149     {
150 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
151 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
152 nigel 3 else
153     {
154     strncpy(errbuf, message, errbuf_size - 1);
155     errbuf[errbuf_size-1] = 0;
156     }
157     }
158    
159 nigel 7 return length + addlength;
160 nigel 3 }
161    
162    
163    
164    
165     /*************************************************
166     * Free store held by a regex *
167     *************************************************/
168    
169     void
170     regfree(regex_t *preg)
171     {
172     (pcre_free)(preg->re_pcre);
173     }
174    
175    
176    
177    
178     /*************************************************
179     * Compile a regular expression *
180     *************************************************/
181    
182     /*
183     Arguments:
184     preg points to a structure for recording the compiled expression
185     pattern the pattern to compile
186     cflags compilation flags
187    
188     Returns: 0 on success
189     various non-zero codes on failure
190     */
191    
192     int
193     regcomp(regex_t *preg, const char *pattern, int cflags)
194     {
195 nigel 7 const char *errorptr;
196 nigel 3 int erroffset;
197     int options = 0;
198    
199     if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
200     if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
201    
202 nigel 25 preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);
203 nigel 3 preg->re_erroffset = erroffset;
204    
205     if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);
206    
207     preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);
208     return 0;
209     }
210    
211    
212    
213    
214     /*************************************************
215     * Match a regular expression *
216     *************************************************/
217    
218 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
219     substring, so we have to get and release working store instead of just using
220     the POSIX structures as was done in earlier releases when PCRE needed only 2
221     ints. */
222    
223 nigel 3 int
224     regexec(regex_t *preg, const char *string, size_t nmatch,
225     regmatch_t pmatch[], int eflags)
226     {
227     int rc;
228     int options = 0;
229 nigel 41 int *ovector = NULL;
230 nigel 3
231     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
232     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
233    
234 nigel 15 preg->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
235 nigel 3
236 nigel 41 if (nmatch > 0)
237     {
238 nigel 43 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
239 nigel 41 if (ovector == NULL) return REG_ESPACE;
240     }
241    
242 nigel 35 rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), 0, options,
243 nigel 41 ovector, nmatch * 3);
244 nigel 3
245 nigel 41 if (rc == 0) rc = nmatch; /* All captured slots were filled in */
246 nigel 3
247 nigel 41 if (rc >= 0)
248 nigel 3 {
249 nigel 7 size_t i;
250 nigel 41 for (i = 0; i < rc; i++)
251     {
252     pmatch[i].rm_so = ovector[i*2];
253     pmatch[i].rm_eo = ovector[i*2+1];
254     }
255     if (ovector != NULL) free(ovector);
256     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
257 nigel 3 return 0;
258     }
259    
260 nigel 41 else
261 nigel 3 {
262 nigel 41 if (ovector != NULL) free(ovector);
263     switch(rc)
264     {
265     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
266     case PCRE_ERROR_NULL: return REG_INVARG;
267     case PCRE_ERROR_BADOPTION: return REG_INVARG;
268     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
269     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
270     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
271     default: return REG_ASSERT;
272     }
273 nigel 3 }
274     }
275    
276     /* End of pcreposix.c */

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