1 /* $OpenBSD: regerror.c,v 1.13 2005/08/05 13:03:00 espie Exp $ */
2 /*-
3 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
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 #include <sys/types.h>
38 #include <stdio.h>
39 #include <string.h>
40 #include <ctype.h>
41 #include <limits.h>
42 #include <stdlib.h>
43 #include "./regex.h"
44
45 #include "utils.h"
46
47 static const char *regatoi(const regex_t *, char *, int);
48
49 static const struct rerr {
50 int code;
51 const char *name;
52 const char *explain;
53 } rerrs[] = {
54 { REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match" },
55 { REG_BADPAT, "REG_BADPAT", "invalid regular expression" },
56 { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
57 { REG_ECTYPE, "REG_ECTYPE", "invalid character class" },
58 { REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\\)" },
59 { REG_ESUBREG, "REG_ESUBREG", "invalid backreference number" },
60 { REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced" },
61 { REG_EPAREN, "REG_EPAREN", "parentheses not balanced" },
62 { REG_EBRACE, "REG_EBRACE", "braces not balanced" },
63 { REG_BADBR, "REG_BADBR", "invalid repetition count(s)" },
64 { REG_ERANGE, "REG_ERANGE", "invalid character range" },
65 { REG_ESPACE, "REG_ESPACE", "out of memory" },
66 { REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid" },
67 { REG_EMPTY, "REG_EMPTY", "empty (sub)expression" },
68 { REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug" },
69 { REG_INVARG, "REG_INVARG", "invalid argument to regex routine" },
70 { 0, "", "*** unknown regexp error code ***" }
71 };
72
73 /*
74 - regerror - the interface to error numbers
75 = extern size_t regerror(int, const regex_t *, char *, size_t);
76 */
77 /* ARGSUSED */
78 size_t
regerror(int errcode,const regex_t * preg,char * errbuf,size_t errbuf_size)79 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
80 {
81 const struct rerr *r;
82 size_t len;
83 int target = errcode &~ REG_ITOA;
84 const char *s;
85 char convbuf[50];
86
87 if (errcode == REG_ATOI)
88 s = regatoi(preg, convbuf, sizeof convbuf);
89 else {
90 for (r = rerrs; r->code != 0; r++)
91 if (r->code == target)
92 break;
93
94 if (errcode®_ITOA) {
95 if (r->code != 0) {
96 assert(strlen(r->name) < sizeof(convbuf));
97 (void) strncpy(convbuf, r->name, sizeof convbuf);
98 } else
99 (void)snprintf(convbuf, sizeof convbuf,
100 "REG_0x%x", target);
101 s = convbuf;
102 } else
103 s = r->explain;
104 }
105
106 len = strlen(s) + 1;
107 if (errbuf_size > 0) {
108 strncpy(errbuf, s, errbuf_size);
109 }
110
111 return(len);
112 }
113
114 /*
115 - regatoi - internal routine to implement REG_ATOI
116 */
117 static const char *
regatoi(const regex_t * preg,char * localbuf,int localbufsize)118 regatoi(const regex_t *preg, char *localbuf, int localbufsize)
119 {
120 const struct rerr *r;
121
122 for (r = rerrs; r->code != 0; r++)
123 if (strcmp(r->name, preg->re_endp) == 0)
124 break;
125 if (r->code == 0)
126 return("0");
127
128 (void)snprintf(localbuf, localbufsize, "%d", r->code);
129 return(localbuf);
130 }
131