[project @ 2002-02-14 13:59:21 by simonmar]
[packages/random.git] / cbits / regex / regerror.c
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 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. 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 defined(LIBC_SCCS) && !defined(lint)
41 static char sccsid[] = "@(#)regerror.c 8.4 (Berkeley) 3/20/94";
42 #endif /* LIBC_SCCS and not lint */
43
44 #include <sys/types.h>
45 #include <stdio.h>
46 #include <string.h>
47 #include <limits.h>
48 #include <stdlib.h>
49 #include <regex.h>
50
51 #include "utils.h"
52
53 /* ========= begin header generated by ./mkh ========= */
54 #ifdef __cplusplus
55 extern "C" {
56 #endif
57
58 /* === regerror.c === */
59 static char *regatoi __P((const regex_t *preg, char *localbuf));
60
61 #ifdef __cplusplus
62 }
63 #endif
64 /* ========= end header generated by ./mkh ========= */
65 /*
66 = #define REG_NOMATCH 1
67 = #define REG_BADPAT 2
68 = #define REG_ECOLLATE 3
69 = #define REG_ECTYPE 4
70 = #define REG_EESCAPE 5
71 = #define REG_ESUBREG 6
72 = #define REG_EBRACK 7
73 = #define REG_EPAREN 8
74 = #define REG_EBRACE 9
75 = #define REG_BADBR 10
76 = #define REG_ERANGE 11
77 = #define REG_ESPACE 12
78 = #define REG_BADRPT 13
79 = #define REG_EMPTY 14
80 = #define REG_ASSERT 15
81 = #define REG_INVARG 16
82 = #define REG_ATOI 255 // convert name to number (!)
83 = #define REG_ITOA 0400 // convert number to name (!)
84 */
85 static struct rerr {
86 int code;
87 char *name;
88 char *explain;
89 } rerrs[] = {
90 {REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match"},
91 {REG_BADPAT, "REG_BADPAT", "invalid regular expression"},
92 {REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element"},
93 {REG_ECTYPE, "REG_ECTYPE", "invalid character class"},
94 {REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\\)"},
95 {REG_ESUBREG, "REG_ESUBREG", "invalid backreference number"},
96 {REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced"},
97 {REG_EPAREN, "REG_EPAREN", "parentheses not balanced"},
98 {REG_EBRACE, "REG_EBRACE", "braces not balanced"},
99 {REG_BADBR, "REG_BADBR", "invalid repetition count(s)"},
100 {REG_ERANGE, "REG_ERANGE", "invalid character range"},
101 {REG_ESPACE, "REG_ESPACE", "out of memory"},
102 {REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid"},
103 {REG_EMPTY, "REG_EMPTY", "empty (sub)expression"},
104 {REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug"},
105 {REG_INVARG, "REG_INVARG", "invalid argument to regex routine"},
106 {0, "", "*** unknown regexp error code ***"}
107 };
108
109 /*
110 - regerror - the interface to error numbers
111 = extern size_t regerror(int, const regex_t *, char *, size_t);
112 */
113 /* ARGSUSED */
114 size_t
115 regerror(errcode, preg, errbuf, errbuf_size)
116 int errcode;
117 const regex_t *preg;
118 char *errbuf;
119 size_t errbuf_size;
120 {
121 register struct rerr *r;
122 register size_t len;
123 register int target = errcode &~ REG_ITOA;
124 register char *s;
125 char convbuf[50];
126
127 if (errcode == REG_ATOI)
128 s = regatoi(preg, convbuf);
129 else {
130 for (r = rerrs; r->code != 0; r++)
131 if (r->code == target)
132 break;
133
134 if (errcode&REG_ITOA) {
135 if (r->code != 0)
136 (void) strcpy(convbuf, r->name);
137 else
138 sprintf(convbuf, "REG_0x%x", target);
139 assert(strlen(convbuf) < sizeof(convbuf));
140 s = convbuf;
141 } else
142 s = r->explain;
143 }
144
145 len = strlen(s) + 1;
146 if (errbuf_size > 0) {
147 if (errbuf_size > len)
148 (void) strcpy(errbuf, s);
149 else {
150 (void) strncpy(errbuf, s, errbuf_size-1);
151 errbuf[errbuf_size-1] = '\0';
152 }
153 }
154
155 return(len);
156 }
157
158 /*
159 - regatoi - internal routine to implement REG_ATOI
160 == static char *regatoi(const regex_t *preg, char *localbuf);
161 */
162 static char *
163 regatoi(preg, localbuf)
164 const regex_t *preg;
165 char *localbuf;
166 {
167 register struct rerr *r;
168
169 for (r = rerrs; r->code != 0; r++)
170 if (strcmp(r->name, preg->re_endp) == 0)
171 break;
172 if (r->code == 0)
173 return("0");
174
175 sprintf(localbuf, "%d", r->code);
176 return(localbuf);
177 }