1 /* $NetBSD: regerror.c,v 1.26 2022/11/05 11:33:55 riastradh Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
7 * Copyright (c) 1992, 1993, 1994
8 * The Regents of the University of California. All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Henry Spencer.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. 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 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)regerror.c 8.4 (Berkeley) 3/20/94
38 */
39
40 #if HAVE_NBTOOL_CONFIG_H
41 #include "nbtool_config.h"
42 #endif
43
44 #include <sys/cdefs.h>
45 #if 0
46 static char sccsid[] = "@(#)regerror.c 8.4 (Berkeley) 3/20/94";
47 __FBSDID("$FreeBSD: head/lib/libc/regex/regerror.c 326025 2017-11-20 19:49:47Z pfg $");
48 #endif
49 __RCSID("$NetBSD: regerror.c,v 1.26 2022/11/05 11:33:55 riastradh Exp $");
50
51 #include "namespace.h"
52 #include <sys/types.h>
53 #include <stdio.h>
54 #include <string.h>
55 #include <limits.h>
56 #include <stdlib.h>
57 #include <regex.h>
58
59 #include "utils.h"
60
61 #ifdef __weak_alias
__weak_alias(regerror,_regerror)62 __weak_alias(regerror,_regerror)
63 #endif
64
65 /* ========= begin header generated by ./mkh ========= */
66 #ifdef __cplusplus
67 extern "C" {
68 #endif
69
70 /* === regerror.c === */
71 static const char *regatoi(const regex_t *preg, char *localbufm, size_t buflen);
72
73 #ifdef __cplusplus
74 }
75 #endif
76 /* ========= end header generated by ./mkh ========= */
77 /*
78 = #define REG_NOMATCH 1
79 = #define REG_BADPAT 2
80 = #define REG_ECOLLATE 3
81 = #define REG_ECTYPE 4
82 = #define REG_EESCAPE 5
83 = #define REG_ESUBREG 6
84 = #define REG_EBRACK 7
85 = #define REG_EPAREN 8
86 = #define REG_EBRACE 9
87 = #define REG_BADBR 10
88 = #define REG_ERANGE 11
89 = #define REG_ESPACE 12
90 = #define REG_BADRPT 13
91 = #define REG_EMPTY 14
92 = #define REG_ASSERT 15
93 = #define REG_INVARG 16
94 = #define REG_ENOSYS 17
95 = #define REG_ILLSEQ 18
96 = #define REG_ATOI 255 // convert name to number (!)
97 = #define REG_ITOA 0400 // convert number to name (!)
98 */
99 static const struct rerr {
100 int code;
101 const char *name;
102 const char *explain;
103 } rerrs[] = {
104 {REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match"},
105 {REG_BADPAT, "REG_BADPAT", "invalid regular expression"},
106 {REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element"},
107 {REG_ECTYPE, "REG_ECTYPE", "invalid character class"},
108 {REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\\)"},
109 {REG_ESUBREG, "REG_ESUBREG", "invalid backreference number"},
110 {REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced"},
111 {REG_EPAREN, "REG_EPAREN", "parentheses not balanced"},
112 {REG_EBRACE, "REG_EBRACE", "braces not balanced"},
113 {REG_BADBR, "REG_BADBR", "invalid repetition count(s)"},
114 {REG_ERANGE, "REG_ERANGE", "invalid character range"},
115 {REG_ESPACE, "REG_ESPACE", "out of memory"},
116 {REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid"},
117 {REG_EMPTY, "REG_EMPTY", "empty (sub)expression"},
118 {REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug"},
119 {REG_INVARG, "REG_INVARG", "invalid argument to regex routine"},
120 {REG_ILLSEQ, "REG_ILLSEQ", "illegal byte sequence"},
121 {0, "", "*** unknown regexp error code ***"}
122 };
123
124 /*
125 - regerror - the interface to error numbers
126 = extern size_t regerror(int, const regex_t *, char *, size_t);
127 */
128 /* ARGSUSED */
129 size_t
regerror(int errcode,const regex_t * __restrict preg,char * __restrict errbuf,size_t errbuf_size)130 regerror(int errcode,
131 const regex_t * __restrict preg,
132 char * __restrict errbuf,
133 size_t errbuf_size)
134 {
135 const struct rerr *r;
136 size_t len;
137 int target = errcode &~ REG_ITOA;
138 const char *s;
139 char convbuf[50];
140
141 _DIAGASSERT(errcode != REG_ATOI || preg != NULL);
142 _DIAGASSERT(errbuf_size == 0 || errbuf != NULL);
143
144 if (errcode == REG_ATOI) {
145 s = regatoi(preg, convbuf, sizeof convbuf);
146 } else {
147 for (r = rerrs; r->code != 0; r++)
148 if (r->code == target)
149 break;
150
151 if (errcode®_ITOA) {
152 if (r->code != 0)
153 (void) strlcpy(convbuf, r->name, sizeof(convbuf));
154 else
155 snprintf(convbuf, sizeof(convbuf), "REG_0x%x", target);
156 s = convbuf;
157 } else
158 s = r->explain;
159 }
160
161 len = strlen(s) + 1;
162 if (errbuf_size > 0)
163 (void) strlcpy(errbuf, s, errbuf_size);
164
165 return(len);
166 }
167
168 /*
169 - regatoi - internal routine to implement REG_ATOI
170 == static char *regatoi(const regex_t *preg, char *localbuf);
171 */
172 static const char *
regatoi(const regex_t * preg,char * localbuf,size_t buflen)173 regatoi(const regex_t *preg, char *localbuf, size_t buflen)
174 {
175 const struct rerr *r;
176
177 for (r = rerrs; r->code != 0; r++)
178 if (strcmp(r->name, preg->re_endp) == 0)
179 break;
180 if (r->code == 0)
181 return "0";
182
183 snprintf(localbuf, buflen, "%d", r->code);
184 return localbuf;
185 }
186