1 /* $NetBSD: regerror.c,v 1.25 2021/02/26 19:24:47 christos 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 1.25 2021/02/26 19:24:47 christos 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 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 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 != 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 * 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