1 /* $NetBSD: regerror.c,v 1.23 2007/02/09 23:44:18 junyoung Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Henry Spencer.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)regerror.c 8.4 (Berkeley) 3/20/94
35 */
36
37 /*-
38 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
39 *
40 * This code is derived from software contributed to Berkeley by
41 * Henry Spencer.
42 *
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. All advertising materials mentioning features or use of this software
52 * must display the following acknowledgement:
53 * This product includes software developed by the University of
54 * California, Berkeley and its contributors.
55 * 4. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 * @(#)regerror.c 8.4 (Berkeley) 3/20/94
72 */
73
74 #include <sys/cdefs.h>
75 #if defined(LIBC_SCCS) && !defined(lint)
76 #if 0
77 static char sccsid[] = "@(#)regerror.c 8.4 (Berkeley) 3/20/94";
78 #else
79 __RCSID("$NetBSD: regerror.c,v 1.23 2007/02/09 23:44:18 junyoung Exp $");
80 #endif
81 #endif /* LIBC_SCCS and not lint */
82
83 #include "namespace.h"
84 #include <sys/types.h>
85
86 #include <assert.h>
87 #include <ctype.h>
88 #include <limits.h>
89 #include <stdio.h>
90 #include <stdlib.h>
91 #include <string.h>
92 #include <regex.h>
93
94 #ifdef __weak_alias
__weak_alias(regerror,_regerror)95 __weak_alias(regerror,_regerror)
96 #endif
97
98 #include "utils.h"
99
100 /* ========= begin header generated by ./mkh ========= */
101 #ifdef __cplusplus
102 extern "C" {
103 #endif
104
105 /* === regerror.c === */
106 static const char *regatoi(const regex_t *preg, char *localbuf, size_t buflen);
107
108 #ifdef __cplusplus
109 }
110 #endif
111 /* ========= end header generated by ./mkh ========= */
112 /*
113 = #define REG_NOMATCH 1
114 = #define REG_BADPAT 2
115 = #define REG_ECOLLATE 3
116 = #define REG_ECTYPE 4
117 = #define REG_EESCAPE 5
118 = #define REG_ESUBREG 6
119 = #define REG_EBRACK 7
120 = #define REG_EPAREN 8
121 = #define REG_EBRACE 9
122 = #define REG_BADBR 10
123 = #define REG_ERANGE 11
124 = #define REG_ESPACE 12
125 = #define REG_BADRPT 13
126 = #define REG_EMPTY 14
127 = #define REG_ASSERT 15
128 = #define REG_INVARG 16
129 = #define REG_ATOI 255 // convert name to number (!)
130 = #define REG_ITOA 0400 // convert number to name (!)
131 */
132 static const struct rerr {
133 int code;
134 const char *name;
135 const char *explain;
136 } rerrs[] = {
137 { REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match" },
138 { REG_BADPAT, "REG_BADPAT", "invalid regular expression" },
139 { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
140 { REG_ECTYPE, "REG_ECTYPE", "invalid character class" },
141 { REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\\)" },
142 { REG_ESUBREG, "REG_ESUBREG", "invalid backreference number" },
143 { REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced" },
144 { REG_EPAREN, "REG_EPAREN", "parentheses not balanced" },
145 { REG_EBRACE, "REG_EBRACE", "braces not balanced" },
146 { REG_BADBR, "REG_BADBR", "invalid repetition count(s)" },
147 { REG_ERANGE, "REG_ERANGE", "invalid character range" },
148 { REG_ESPACE, "REG_ESPACE", "out of memory" },
149 { REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid" },
150 { REG_EMPTY, "REG_EMPTY", "empty (sub)expression" },
151 { REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug" },
152 { REG_INVARG, "REG_INVARG", "invalid argument to regex routine" },
153 { 0, "", "*** unknown regexp error code ***" }
154 };
155
156 /*
157 * regerror - the interface to error numbers
158 * extern size_t regerror(int, const regex_t *, char *, size_t);
159 */
160 /* ARGSUSED */
161 size_t
regerror(int errcode,const regex_t * preg,char * errbuf,size_t errbuf_size)162 regerror(
163 int errcode,
164 const regex_t *preg,
165 char *errbuf,
166 size_t errbuf_size)
167 {
168 const struct rerr *r;
169 size_t len;
170 int target = errcode &~ REG_ITOA;
171 const char *s;
172 char convbuf[50];
173
174 _DIAGASSERT(errcode != REG_ATOI || preg != NULL);
175 _DIAGASSERT(errbuf != NULL);
176
177 if (errcode == REG_ATOI)
178 s = regatoi(preg, convbuf, sizeof convbuf);
179 else {
180 for (r = rerrs; r->code != 0; r++)
181 if (r->code == target)
182 break;
183
184 if (errcode & REG_ITOA) {
185 if (r->code != 0) {
186 (void)strlcpy(convbuf, r->name, sizeof convbuf);
187 } else
188 (void)snprintf(convbuf, sizeof convbuf,
189 "REG_0x%x", target);
190 s = convbuf;
191 } else
192 s = r->explain;
193 }
194
195 len = strlen(s) + 1;
196 if (errbuf_size > 0)
197 (void)strlcpy(errbuf, s, errbuf_size);
198
199 return(len);
200 }
201
202 /*
203 * regatoi - internal routine to implement REG_ATOI
204 * static const char *regatoi(const regex_t *preg, char *localbuf,
205 * size_t buflen);
206 */
207 static const char *
regatoi(const regex_t * preg,char * localbuf,size_t buflen)208 regatoi(
209 const regex_t *preg,
210 char *localbuf,
211 size_t buflen)
212 {
213 const struct rerr *r;
214
215 for (r = rerrs; r->code != 0; r++)
216 if (strcmp(r->name, preg->re_endp) == 0)
217 break;
218 if (r->code == 0)
219 return "0";
220
221 (void)snprintf(localbuf, buflen, "%d", r->code);
222 return localbuf;
223 }
224