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 of the University of Toronto.
   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  8.3 (Berkeley) 3/19/94
  38  */
  39
  40 #if defined(LIBC_SCCS) && !defined(lint)
  41 static char sccsid[] = "@(#)regerror.c  8.3 (Berkeley) 3/19/94";
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 #include <sys/types.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <ctype.h>
  48 #include <limits.h>
  49 #include <stdlib.h>
  50 #include <regex.h>
  51
  52 #include "utils.h"
  53
  54 /* ========= begin header generated by ./mkh ========= */
  55 #ifdef __cplusplus
  56 extern "C" {
  57 #endif
  58
  59 /* === regerror.c === */
  60 static char *regatoi __P((const regex_t *preg, char *localbuf));
  61
  62 #ifdef __cplusplus
  63 }
  64 #endif
  65 /* ========= end header generated by ./mkh ========= */
  66 /*
  67  = #define      REG_NOMATCH      1
  68  = #define      REG_BADPAT       2
  69  = #define      REG_ECOLLATE     3
  70  = #define      REG_ECTYPE       4
  71  = #define      REG_EESCAPE      5
  72  = #define      REG_ESUBREG      6
  73  = #define      REG_EBRACK       7
  74  = #define      REG_EPAREN       8
  75  = #define      REG_EBRACE       9
  76  = #define      REG_BADBR       10
  77  = #define      REG_ERANGE      11
  78  = #define      REG_ESPACE      12
  79  = #define      REG_BADRPT      13
  80  = #define      REG_EMPTY       14
  81  = #define      REG_ASSERT      15
  82  = #define      REG_INVARG      16
  83  = #define      REG_ATOI        255     // convert name to number (!)
  84  = #define      REG_ITOA        0400    // convert number to name (!)
  85  */
  86 static struct rerr {
  87         int code;
  88         char *name;
  89         char *explain;
  90 } rerrs[] = {
  91         REG_NOMATCH,    "REG_NOMATCH",  "regexec() failed to match",
  92         REG_BADPAT,     "REG_BADPAT",   "invalid regular expression",
  93         REG_ECOLLATE,   "REG_ECOLLATE", "invalid collating element",
  94         REG_ECTYPE,     "REG_ECTYPE",   "invalid character class",
  95         REG_EESCAPE,    "REG_EESCAPE",  "trailing backslash (\\)",
  96         REG_ESUBREG,    "REG_ESUBREG",  "invalid backreference number",
  97         REG_EBRACK,     "REG_EBRACK",   "brackets ([ ]) not balanced",
  98         REG_EPAREN,     "REG_EPAREN",   "parentheses not balanced",
  99         REG_EBRACE,     "REG_EBRACE",   "braces not balanced",
 100         REG_BADBR,      "REG_BADBR",    "invalid repetition count(s)",
 101         REG_ERANGE,     "REG_ERANGE",   "invalid character range",
 102         REG_ESPACE,     "REG_ESPACE",   "out of memory",
 103         REG_BADRPT,     "REG_BADRPT",   "repetition-operator operand invalid",
 104         REG_EMPTY,      "REG_EMPTY",    "empty (sub)expression",
 105         REG_ASSERT,     "REG_ASSERT",   "\"can't happen\" -- you found a bug",
 106         REG_INVARG,     "REG_INVARG",   "invalid argument to regex routine",
 107         0,              "",             "*** unknown regexp error code ***",
 108 };
 109
 110 /*
 111  - regerror - the interface to error numbers
 112  = extern size_t regerror(int, const regex_t *, char *, size_t);
 113  */
 114 /* ARGSUSED */
 115 size_t
 116 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
 117 {
 118         register struct rerr *r;
 119         register size_t len;
 120         register int target = errcode &~ REG_ITOA;
 121         register char *s;
 122         char convbuf[50];
 123
 124         if (errcode == REG_ATOI)
 125                 s = regatoi(preg, convbuf);
 126         else {
 127                 for (r = rerrs; r->code != 0; r++)
 128                         if (r->code == target)
 129                                 break;
 130
 131                 if (errcode&REG_ITOA) {
 132                         if (r->code != 0)
 133                                 (void) strcpy(convbuf, r->name);
 134                         else
 135                                 sprintf(convbuf, "REG_0x%x", target);
 136                         assert(strlen(convbuf) < sizeof(convbuf));
 137                         s = convbuf;
 138                 } else
 139                         s = r->explain;
 140         }
 141
 142         len = strlen(s) + 1;
 143         if (errbuf_size > 0) {
 144                 if (errbuf_size > len)
 145                         (void) strcpy(errbuf, s);
 146                 else {
 147                         (void) strncpy(errbuf, s, errbuf_size-1);
 148                         errbuf[errbuf_size-1] = '\0';
 149                 }
 150         }
 151
 152         return(len);
 153 }
 154
 155 /*
 156  - regatoi - internal routine to implement REG_ATOI
 157  == static char *regatoi(const regex_t *preg, char *localbuf);
 158  */
 159 static char *
 160 regatoi(const regex_t *preg, char *localbuf)
 161 {
 162 #if 0 /* we don't seem to use this and it gives a warning. */
 163         register struct rerr *r;
 164         register size_t siz;
 165         register char *p;
 166
 167         for (r = rerrs; r->code != 0; r++)
 168                 if (strcmp(r->name, preg->re_endp) == 0)
 169                         break;
 170         if (r->code == 0)
 171                 return("0");
 172
 173         sprintf(localbuf, "%d", r->code);
 174 #else
 175         *localbuf = '\0';
 176 #endif
 177         return(localbuf);
 178 }