lib/libc/regex/regerror.c

   1 /*      $NetBSD: regerror.c,v 1.23 2007/02/09 23:44:18 junyoung Exp $   */
   2
   3 /*-
   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 /*-
  38  * Copyright (c) 1992, 1993, 1994 Henry Spencer.
  39  *
  40  * This code is derived from software contributed to Berkeley by
  41  * Henry Spencer.
  42  *
  43  * Redistribution and use in source and binary forms, with or without
  44  * modification, are permitted provided that the following conditions
  45  * are met:
  46  * 1. Redistributions of source code must retain the above copyright
  47  *    notice, this list of conditions and the following disclaimer.
  48  * 2. Redistributions in binary form must reproduce the above copyright
  49  *    notice, this list of conditions and the following disclaimer in the
  50  *    documentation and/or other materials provided with the distribution.
  51  * 3. All advertising materials mentioning features or use of this software
  52  *    must display the following acknowledgement:
  53  *      This product includes software developed by the University of
  54  *      California, Berkeley and its contributors.
  55  * 4. Neither the name of the University nor the names of its contributors
  56  *    may be used to endorse or promote products derived from this software
  57  *    without specific prior written permission.
  58  *
  59  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  69  * SUCH DAMAGE.
  70  *
  71  *      @(#)regerror.c  8.4 (Berkeley) 3/20/94
  72  */
  73
  74 #include <sys/cdefs.h>
  75 #if defined(LIBC_SCCS) && !defined(lint)
  76 #if 0
  77 static char sccsid[] = "@(#)regerror.c  8.4 (Berkeley) 3/20/94";
  78 #else
  79 __RCSID("$NetBSD: regerror.c,v 1.23 2007/02/09 23:44:18 junyoung Exp $");
  80 #endif
  81 #endif /* LIBC_SCCS and not lint */
  82
  83 #include "namespace.h"
  84 #include <sys/types.h>
  85
  86 #include <assert.h>
  87 #include <ctype.h>
  88 #include <limits.h>
  89 #include <stdio.h>
  90 #include <stdlib.h>
  91 #include <string.h>
  92 #include <regex.h>
  93
  94 #ifdef __weak_alias
  95 __weak_alias(regerror,_regerror)
  96 #endif
  97
  98 #include "utils.h"
  99
 100 /* ========= begin header generated by ./mkh ========= */
 101 #ifdef __cplusplus
 102 extern "C" {
 103 #endif
 104
 105 /* === regerror.c === */
 106 static const char *regatoi(const regex_t *preg, char *localbuf, size_t buflen);
 107
 108 #ifdef __cplusplus
 109 }
 110 #endif
 111 /* ========= end header generated by ./mkh ========= */
 112 /*
 113  = #define      REG_NOMATCH      1
 114  = #define      REG_BADPAT       2
 115  = #define      REG_ECOLLATE     3
 116  = #define      REG_ECTYPE       4
 117  = #define      REG_EESCAPE      5
 118  = #define      REG_ESUBREG      6
 119  = #define      REG_EBRACK       7
 120  = #define      REG_EPAREN       8
 121  = #define      REG_EBRACE       9
 122  = #define      REG_BADBR       10
 123  = #define      REG_ERANGE      11
 124  = #define      REG_ESPACE      12
 125  = #define      REG_BADRPT      13
 126  = #define      REG_EMPTY       14
 127  = #define      REG_ASSERT      15
 128  = #define      REG_INVARG      16
 129  = #define      REG_ATOI        255     // convert name to number (!)
 130  = #define      REG_ITOA        0400    // convert number to name (!)
 131  */
 132 static const struct rerr {
 133         int code;
 134         const char *name;
 135         const char *explain;
 136 } rerrs[] = {
 137         { REG_NOMATCH,  "REG_NOMATCH",  "regexec() failed to match" },
 138         { REG_BADPAT,   "REG_BADPAT",   "invalid regular expression" },
 139         { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
 140         { REG_ECTYPE,   "REG_ECTYPE",   "invalid character class" },
 141         { REG_EESCAPE,  "REG_EESCAPE",  "trailing backslash (\\)" },
 142         { REG_ESUBREG,  "REG_ESUBREG",  "invalid backreference number" },
 143         { REG_EBRACK,   "REG_EBRACK",   "brackets ([ ]) not balanced" },
 144         { REG_EPAREN,   "REG_EPAREN",   "parentheses not balanced" },
 145         { REG_EBRACE,   "REG_EBRACE",   "braces not balanced" },
 146         { REG_BADBR,    "REG_BADBR",    "invalid repetition count(s)" },
 147         { REG_ERANGE,   "REG_ERANGE",   "invalid character range" },
 148         { REG_ESPACE,   "REG_ESPACE",   "out of memory" },
 149         { REG_BADRPT,   "REG_BADRPT",   "repetition-operator operand invalid" },
 150         { REG_EMPTY,    "REG_EMPTY",    "empty (sub)expression" },
 151         { REG_ASSERT,   "REG_ASSERT",   "\"can't happen\" -- you found a bug" },
 152         { REG_INVARG,   "REG_INVARG",   "invalid argument to regex routine" },
 153         { 0,            "",             "*** unknown regexp error code ***" }
 154 };
 155
 156 /*
 157  * regerror - the interface to error numbers
 158  * extern size_t regerror(int, const regex_t *, char *, size_t);
 159  */
 160 /* ARGSUSED */
 161 size_t
 162 regerror(
 163     int errcode,
 164     const regex_t *preg,
 165     char *errbuf,
 166     size_t errbuf_size)
 167 {
 168         const struct rerr *r;
 169         size_t len;
 170         int target = errcode &~ REG_ITOA;
 171         const char *s;
 172         char convbuf[50];
 173
 174         _DIAGASSERT(errcode != REG_ATOI || preg != NULL);
 175         _DIAGASSERT(errbuf != NULL);
 176
 177         if (errcode == REG_ATOI)
 178                 s = regatoi(preg, convbuf, sizeof convbuf);
 179         else {
 180                 for (r = rerrs; r->code != 0; r++)
 181                         if (r->code == target)
 182                                 break;
 183
 184                 if (errcode & REG_ITOA) {
 185                         if (r->code != 0) {
 186                                 (void)strlcpy(convbuf, r->name, sizeof convbuf);
 187                         } else
 188                                 (void)snprintf(convbuf, sizeof convbuf,
 189                                     "REG_0x%x", target);
 190                         s = convbuf;
 191                 } else
 192                         s = r->explain;
 193         }
 194
 195         len = strlen(s) + 1;
 196         if (errbuf_size > 0)
 197                 (void)strlcpy(errbuf, s, errbuf_size);
 198
 199         return(len);
 200 }
 201
 202 /*
 203  * regatoi - internal routine to implement REG_ATOI
 204  * static const char *regatoi(const regex_t *preg, char *localbuf,
 205  * size_t buflen);
 206  */
 207 static const char *
 208 regatoi(
 209     const regex_t *preg,
 210     char *localbuf,
 211     size_t buflen)
 212 {
 213         const struct rerr *r;
 214
 215         for (r = rerrs; r->code != 0; r++)
 216                 if (strcmp(r->name, preg->re_endp) == 0)
 217                         break;
 218         if (r->code == 0)
 219                 return "0";
 220
 221         (void)snprintf(localbuf, buflen, "%d", r->code);
 222         return localbuf;
 223 }