contrib/nvi2/regex/regerror.c

   1 /*      $NetBSD: regerror.c,v 1.2 2008/12/05 22:51:43 christos 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. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)regerror.c  8.3 (Berkeley) 3/19/94
  36  */
  37
  38 #if defined(LIBC_SCCS) && !defined(lint)
  39 static char sccsid[] = "@(#)regerror.c  8.3 (Berkeley) 3/19/94";
  40 #endif /* LIBC_SCCS and not lint */
  41
  42 #include <sys/types.h>
  43 #include <stdio.h>
  44 #include <string.h>
  45 #include <ctype.h>
  46 #include <limits.h>
  47 #include <stdlib.h>
  48 #include <regex.h>
  49
  50 #include "utils.h"
  51
  52 /* ========= begin header generated by ./mkh ========= */
  53 #ifdef __cplusplus
  54 extern "C" {
  55 #endif
  56
  57 /* === regerror.c === */
  58 static char *regatoi(const regex_t *preg, char *localbuf);
  59
  60 #ifdef __cplusplus
  61 }
  62 #endif
  63 /* ========= end header generated by ./mkh ========= */
  64 /*
  65  = #define      REG_NOMATCH      1
  66  = #define      REG_BADPAT       2
  67  = #define      REG_ECOLLATE     3
  68  = #define      REG_ECTYPE       4
  69  = #define      REG_EESCAPE      5
  70  = #define      REG_ESUBREG      6
  71  = #define      REG_EBRACK       7
  72  = #define      REG_EPAREN       8
  73  = #define      REG_EBRACE       9
  74  = #define      REG_BADBR       10
  75  = #define      REG_ERANGE      11
  76  = #define      REG_ESPACE      12
  77  = #define      REG_BADRPT      13
  78  = #define      REG_EMPTY       14
  79  = #define      REG_ASSERT      15
  80  = #define      REG_INVARG      16
  81  = #define      REG_ATOI        255     // convert name to number (!)
  82  = #define      REG_ITOA        0400    // convert number to name (!)
  83  */
  84 static struct rerr {
  85         int code;
  86         const char *name;
  87         const char *explain;
  88 } rerrs[] = {
  89         { REG_NOMATCH,  "REG_NOMATCH",  "regexec() failed to match" },
  90         { REG_BADPAT,   "REG_BADPAT",   "invalid regular expression" },
  91         { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
  92         { REG_ECTYPE,   "REG_ECTYPE",   "invalid character class" },
  93         { REG_EESCAPE,  "REG_EESCAPE",  "trailing backslash (\\)" },
  94         { REG_ESUBREG,  "REG_ESUBREG",  "invalid backreference number" },
  95         { REG_EBRACK,   "REG_EBRACK",   "brackets ([ ]) not balanced" },
  96         { REG_EPAREN,   "REG_EPAREN",   "parentheses not balanced" },
  97         { REG_EBRACE,   "REG_EBRACE",   "braces not balanced" },
  98         { REG_BADBR,    "REG_BADBR",    "invalid repetition count(s)" },
  99         { REG_ERANGE,   "REG_ERANGE",   "invalid character range" },
 100         { REG_ESPACE,   "REG_ESPACE",   "out of memory" },
 101         { REG_BADRPT,   "REG_BADRPT",   "repetition-operator operand invalid" },
 102         { REG_EMPTY,    "REG_EMPTY",    "empty (sub)expression" },
 103         { REG_ASSERT,   "REG_ASSERT",   "\"can't happen\" -- you found a bug" },
 104         { REG_INVARG,   "REG_INVARG",   "invalid argument to regex routine" },
 105         { 0,            "",             "*** unknown regexp error code ***" },
 106 };
 107
 108 /*
 109  - regerror - the interface to error numbers
 110  = extern size_t regerror(int, const regex_t *, char *, size_t);
 111  */
 112 /* ARGSUSED */
 113 size_t
 114 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
 115 {
 116         struct rerr *r;
 117         size_t len;
 118         int target = errcode &~ REG_ITOA;
 119         const char *s;
 120         char convbuf[50];
 121
 122         if (errcode == REG_ATOI)
 123                 s = regatoi(preg, convbuf);
 124         else {
 125                 for (r = rerrs; r->code != 0; r++)
 126                         if (r->code == target)
 127                                 break;
 128
 129                 if (errcode&REG_ITOA) {
 130                         if (r->code != 0) {
 131                                 assert(strlen(r->name) < sizeof(convbuf));
 132                                 (void) strlcpy(convbuf, r->name, sizeof(convbuf));
 133                         } else
 134                                 (void) snprintf(convbuf, sizeof(convbuf),
 135                                     "REG_0x%x", target);
 136                         s = convbuf;
 137                 } else
 138                         s = r->explain;
 139         }
 140
 141         len = strlen(s) + 1;
 142         if (errbuf_size > 0) {
 143                 strlcpy(errbuf, s, errbuf_size);
 144         }
 145
 146         return(len);
 147 }
 148
 149 /*
 150  - regatoi - internal routine to implement REG_ATOI
 151  */
 152 static char *
 153 regatoi(const regex_t *preg, char *localbuf)
 154 {
 155 #if 0 /* we don't seem to use this and it gives a warning. */
 156         struct rerr *r;
 157         size_t siz;
 158         char *p;
 159
 160         for (r = rerrs; r->code != 0; r++)
 161                 if (strcmp(r->name, preg->re_endp) == 0)
 162                         break;
 163         if (r->code == 0)
 164                 return("0");
 165
 166         sprintf(localbuf, "%d", r->code);
 167 #else
 168         *localbuf = '\0';
 169 #endif
 170         return(localbuf);
 171 }