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