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