dist/nvi/regex/regerror.c

   1 /*      $NetBSD: regerror.c,v 1.1.1.2 2008/05/18 14:31:38 aymeric Exp $ */
   2
   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 of the University of Toronto.
  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. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      @(#)regerror.c  8.3 (Berkeley) 3/19/94
  40  */
  41
  42 #if defined(LIBC_SCCS) && !defined(lint)
  43 static char sccsid[] = "@(#)regerror.c  8.3 (Berkeley) 3/19/94";
  44 #endif /* LIBC_SCCS and not lint */
  45
  46 #include <sys/types.h>
  47 #include <stdio.h>
  48 #include <string.h>
  49 #include <ctype.h>
  50 #include <limits.h>
  51 #include <stdlib.h>
  52 #include <regex.h>
  53
  54 #include "utils.h"
  55
  56 /* ========= begin header generated by ./mkh ========= */
  57 #ifdef __cplusplus
  58 extern "C" {
  59 #endif
  60
  61 /* === regerror.c === */
  62 static char *regatoi __P((const regex_t *preg, char *localbuf));
  63
  64 #ifdef __cplusplus
  65 }
  66 #endif
  67 /* ========= end header generated by ./mkh ========= */
  68 /*
  69  = #define      REG_NOMATCH      1
  70  = #define      REG_BADPAT       2
  71  = #define      REG_ECOLLATE     3
  72  = #define      REG_ECTYPE       4
  73  = #define      REG_EESCAPE      5
  74  = #define      REG_ESUBREG      6
  75  = #define      REG_EBRACK       7
  76  = #define      REG_EPAREN       8
  77  = #define      REG_EBRACE       9
  78  = #define      REG_BADBR       10
  79  = #define      REG_ERANGE      11
  80  = #define      REG_ESPACE      12
  81  = #define      REG_BADRPT      13
  82  = #define      REG_EMPTY       14
  83  = #define      REG_ASSERT      15
  84  = #define      REG_INVARG      16
  85  = #define      REG_ATOI        255     // convert name to number (!)
  86  = #define      REG_ITOA        0400    // convert number to name (!)
  87  */
  88 static struct rerr {
  89         int code;
  90         const char *name;
  91         const char *explain;
  92 } rerrs[] = {
  93         { REG_NOMATCH,  "REG_NOMATCH",  "regexec() failed to match" },
  94         { REG_BADPAT,   "REG_BADPAT",   "invalid regular expression" },
  95         { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
  96         { REG_ECTYPE,   "REG_ECTYPE",   "invalid character class" },
  97         { REG_EESCAPE,  "REG_EESCAPE",  "trailing backslash (\\)" },
  98         { REG_ESUBREG,  "REG_ESUBREG",  "invalid backreference number" },
  99         { REG_EBRACK,   "REG_EBRACK",   "brackets ([ ]) not balanced" },
 100         { REG_EPAREN,   "REG_EPAREN",   "parentheses not balanced" },
 101         { REG_EBRACE,   "REG_EBRACE",   "braces not balanced" },
 102         { REG_BADBR,    "REG_BADBR",    "invalid repetition count(s)" },
 103         { REG_ERANGE,   "REG_ERANGE",   "invalid character range" },
 104         { REG_ESPACE,   "REG_ESPACE",   "out of memory" },
 105         { REG_BADRPT,   "REG_BADRPT",   "repetition-operator operand invalid" },
 106         { REG_EMPTY,    "REG_EMPTY",    "empty (sub)expression" },
 107         { REG_ASSERT,   "REG_ASSERT",   "\"can't happen\" -- you found a bug" },
 108         { REG_INVARG,   "REG_INVARG",   "invalid argument to regex routine" },
 109         { 0,            "",             "*** unknown regexp error code ***" },
 110 };
 111
 112 /*
 113  - regerror - the interface to error numbers
 114  = extern size_t regerror(int, const regex_t *, char *, size_t);
 115  */
 116 /* ARGSUSED */
 117 size_t
 118 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
 119 {
 120         register struct rerr *r;
 121         register size_t len;
 122         register int target = errcode &~ REG_ITOA;
 123         register const char *s;
 124         char convbuf[50];
 125
 126         if (errcode == REG_ATOI)
 127                 s = regatoi(preg, convbuf);
 128         else {
 129                 for (r = rerrs; r->code != 0; r++)
 130                         if (r->code == target)
 131                                 break;
 132
 133                 if (errcode&REG_ITOA) {
 134                         if (r->code != 0)
 135                                 (void) strcpy(convbuf, r->name);
 136                         else
 137                                 sprintf(convbuf, "REG_0x%x", target);
 138                         assert(strlen(convbuf) < sizeof(convbuf));
 139                         s = convbuf;
 140                 } else
 141                         s = r->explain;
 142         }
 143
 144         len = strlen(s) + 1;
 145         if (errbuf_size > 0) {
 146                 if (errbuf_size > len)
 147                         (void) strcpy(errbuf, s);
 148                 else {
 149                         (void) strncpy(errbuf, s, errbuf_size-1);
 150                         errbuf[errbuf_size-1] = '\0';
 151                 }
 152         }
 153
 154         return(len);
 155 }
 156
 157 /*
 158  - regatoi - internal routine to implement REG_ATOI
 159  == static char *regatoi(const regex_t *preg, char *localbuf);
 160  */
 161 static char *
 162 regatoi(const regex_t *preg, char *localbuf)
 163 {
 164 #if 0 /* we don't seem to use this and it gives a warning. */
 165         register struct rerr *r;
 166         register size_t siz;
 167         register char *p;
 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 #else
 177         *localbuf = '\0';
 178 #endif
 179         return(localbuf);
 180 }