lib/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 #ifdef __minix_vmd
  48 #include <bsd/asciictype.h>
  49 #else
  50 #include <ctype.h>
  51 #endif
  52 #include <limits.h>
  53 #include <stdlib.h>
  54 #include <regex.h>
  55
  56 #include "utils.h"
  57
  58 /* ========= begin header generated by ./mkh ========= */
  59 #ifdef __cplusplus
  60 extern "C" {
  61 #endif
  62
  63 /* === regerror.c === */
  64 static char *regatoi(const regex_t *preg, char *localbuf);
  65
  66 #ifdef __cplusplus
  67 }
  68 #endif
  69 /* ========= end header generated by ./mkh ========= */
  70 /*
  71  = #define      REG_NOMATCH      1
  72  = #define      REG_BADPAT       2
  73  = #define      REG_ECOLLATE     3
  74  = #define      REG_ECTYPE       4
  75  = #define      REG_EESCAPE      5
  76  = #define      REG_ESUBREG      6
  77  = #define      REG_EBRACK       7
  78  = #define      REG_EPAREN       8
  79  = #define      REG_EBRACE       9
  80  = #define      REG_BADBR       10
  81  = #define      REG_ERANGE      11
  82  = #define      REG_ESPACE      12
  83  = #define      REG_BADRPT      13
  84  = #define      REG_EMPTY       14
  85  = #define      REG_ASSERT      15
  86  = #define      REG_INVARG      16
  87  = #define      REG_ATOI        255     // convert name to number (!)
  88  = #define      REG_ITOA        0400    // convert number to name (!)
  89  */
  90 static struct rerr {
  91         int code;
  92         char *name;
  93         char *explain;
  94 } rerrs[] = {
  95         REG_NOMATCH,    "REG_NOMATCH",  "regexec() failed to match",
  96         REG_BADPAT,     "REG_BADPAT",   "invalid regular expression",
  97         REG_ECOLLATE,   "REG_ECOLLATE", "invalid collating element",
  98         REG_ECTYPE,     "REG_ECTYPE",   "invalid character class",
  99         REG_EESCAPE,    "REG_EESCAPE",  "trailing backslash (\\)",
 100         REG_ESUBREG,    "REG_ESUBREG",  "invalid backreference number",
 101         REG_EBRACK,     "REG_EBRACK",   "brackets ([ ]) not balanced",
 102         REG_EPAREN,     "REG_EPAREN",   "parentheses not balanced",
 103         REG_EBRACE,     "REG_EBRACE",   "braces not balanced",
 104         REG_BADBR,      "REG_BADBR",    "invalid repetition count(s)",
 105         REG_ERANGE,     "REG_ERANGE",   "invalid character range",
 106         REG_ESPACE,     "REG_ESPACE",   "out of memory",
 107         REG_BADRPT,     "REG_BADRPT",   "repetition-operator operand invalid",
 108         REG_EMPTY,      "REG_EMPTY",    "empty (sub)expression",
 109         REG_ASSERT,     "REG_ASSERT",   "\"can't happen\" -- you found a bug",
 110         REG_INVARG,     "REG_INVARG",   "invalid argument to regex routine",
 111         0,              "",             "*** unknown regexp error code ***",
 112 };
 113
 114 /*
 115  - regerror - the interface to error numbers
 116  = extern size_t regerror(int, const regex_t *, char *, size_t);
 117  */
 118 /* ARGSUSED */
 119 size_t
 120 regerror(errcode, preg, errbuf, errbuf_size)
 121 int errcode;
 122 const regex_t *preg;
 123 char *errbuf;
 124 size_t errbuf_size;
 125 {
 126         register struct rerr *r;
 127         register size_t len;
 128         register int target = errcode &~ REG_ITOA;
 129         register char *s;
 130         char convbuf[50];
 131
 132         if (errcode == REG_ATOI)
 133                 s = regatoi(preg, convbuf);
 134         else {
 135                 for (r = rerrs; r->code != 0; r++)
 136                         if (r->code == target)
 137                                 break;
 138
 139                 if (errcode&REG_ITOA) {
 140                         if (r->code != 0)
 141                                 (void) strcpy(convbuf, r->name);
 142                         else
 143                                 sprintf(convbuf, "REG_0x%x", target);
 144                         assert(strlen(convbuf) < sizeof(convbuf));
 145                         s = convbuf;
 146                 } else
 147                         s = r->explain;
 148         }
 149
 150         len = strlen(s) + 1;
 151         if (errbuf_size > 0) {
 152                 if (errbuf_size > len)
 153                         (void) strcpy(errbuf, s);
 154                 else {
 155                         (void) strncpy(errbuf, s, errbuf_size-1);
 156                         errbuf[errbuf_size-1] = '\0';
 157                 }
 158         }
 159
 160         return(len);
 161 }
 162
 163 /*
 164  - regatoi - internal routine to implement REG_ATOI
 165  == static char *regatoi(const regex_t *preg, char *localbuf);
 166  */
 167 static char *
 168 regatoi(preg, localbuf)
 169 const regex_t *preg;
 170 char *localbuf;
 171 {
 172         register struct rerr *r;
 173         register size_t siz;
 174         register char *p;
 175
 176         for (r = rerrs; r->code != 0; r++)
 177                 if (strcmp(r->name, preg->re_endp) == 0)
 178                         break;
 179         if (r->code == 0)
 180                 return("0");
 181
 182         sprintf(localbuf, "%d", r->code);
 183         return(localbuf);
 184 }
 185
 186 /*
 187  * $PchId: regerror.c,v 1.2 1996/03/12 19:10:15 philip Exp $
 188  */