external/bsd/nvi/dist/regex/regerror.c

   1 /*      $NetBSD: regerror.c,v 1.5 2014/01/26 21:47:00 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994 Henry Spencer.
   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 of the University of Toronto.
   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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)regerror.c  8.3 (Berkeley) 3/19/94
  39  */
  40
  41 #include <sys/cdefs.h>
  42 #if 0
  43 #if defined(LIBC_SCCS) && !defined(lint)
  44 static char sccsid[] = "@(#)regerror.c  8.3 (Berkeley) 3/19/94";
  45 #endif /* LIBC_SCCS and not lint */
  46 #else
  47 __RCSID("$NetBSD: regerror.c,v 1.5 2014/01/26 21:47:00 christos Exp $");
  48 #endif
  49
  50 #include <sys/types.h>
  51 #include <stdio.h>
  52 #include <string.h>
  53 #include <ctype.h>
  54 #include <limits.h>
  55 #include <stdlib.h>
  56 #include <regex.h>
  57
  58 #include "utils.h"
  59
  60 /* ========= begin header generated by ./mkh ========= */
  61 #ifdef __cplusplus
  62 extern "C" {
  63 #endif
  64
  65 /* === regerror.c === */
  66 static char *regatoi __P((const regex_t *preg, char *localbuf));
  67
  68 #ifdef __cplusplus
  69 }
  70 #endif
  71 /* ========= end header generated by ./mkh ========= */
  72 /*
  73  = #define      REG_NOMATCH      1
  74  = #define      REG_BADPAT       2
  75  = #define      REG_ECOLLATE     3
  76  = #define      REG_ECTYPE       4
  77  = #define      REG_EESCAPE      5
  78  = #define      REG_ESUBREG      6
  79  = #define      REG_EBRACK       7
  80  = #define      REG_EPAREN       8
  81  = #define      REG_EBRACE       9
  82  = #define      REG_BADBR       10
  83  = #define      REG_ERANGE      11
  84  = #define      REG_ESPACE      12
  85  = #define      REG_BADRPT      13
  86  = #define      REG_EMPTY       14
  87  = #define      REG_ASSERT      15
  88  = #define      REG_INVARG      16
  89  = #define      REG_ATOI        255     // convert name to number (!)
  90  = #define      REG_ITOA        0400    // convert number to name (!)
  91  */
  92 static struct rerr {
  93         int code;
  94         const char *name;
  95         const char *explain;
  96 } rerrs[] = {
  97         { REG_NOMATCH,  "REG_NOMATCH",  "regexec() failed to match" },
  98         { REG_BADPAT,   "REG_BADPAT",   "invalid regular expression" },
  99         { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
 100         { REG_ECTYPE,   "REG_ECTYPE",   "invalid character class" },
 101         { REG_EESCAPE,  "REG_EESCAPE",  "trailing backslash (\\)" },
 102         { REG_ESUBREG,  "REG_ESUBREG",  "invalid backreference number" },
 103         { REG_EBRACK,   "REG_EBRACK",   "brackets ([ ]) not balanced" },
 104         { REG_EPAREN,   "REG_EPAREN",   "parentheses not balanced" },
 105         { REG_EBRACE,   "REG_EBRACE",   "braces not balanced" },
 106         { REG_BADBR,    "REG_BADBR",    "invalid repetition count(s)" },
 107         { REG_ERANGE,   "REG_ERANGE",   "invalid character range" },
 108         { REG_ESPACE,   "REG_ESPACE",   "out of memory" },
 109         { REG_BADRPT,   "REG_BADRPT",   "repetition-operator operand invalid" },
 110         { REG_EMPTY,    "REG_EMPTY",    "empty (sub)expression" },
 111         { REG_ASSERT,   "REG_ASSERT",   "\"can't happen\" -- you found a bug" },
 112         { REG_INVARG,   "REG_INVARG",   "invalid argument to regex routine" },
 113         { 0,            "",             "*** unknown regexp error code ***" },
 114 };
 115
 116 /*
 117  - regerror - the interface to error numbers
 118  = extern size_t regerror(int, const regex_t *, char *, size_t);
 119  */
 120 /* ARGSUSED */
 121 size_t
 122 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
 123 {
 124         struct rerr *r;
 125         size_t len;
 126         int target = errcode &~ REG_ITOA;
 127         const char *s;
 128         char convbuf[50];
 129
 130         if (errcode == REG_ATOI)
 131                 s = regatoi(preg, convbuf);
 132         else {
 133                 for (r = rerrs; r->code != 0; r++)
 134                         if (r->code == target)
 135                                 break;
 136
 137                 if (errcode&REG_ITOA) {
 138                         if (r->code != 0)
 139                                 (void) strcpy(convbuf, r->name);
 140                         else
 141                                 sprintf(convbuf, "REG_0x%x", target);
 142                         assert(strlen(convbuf) < sizeof(convbuf));
 143                         s = convbuf;
 144                 } else
 145                         s = r->explain;
 146         }
 147
 148         len = strlen(s) + 1;
 149         if (errbuf_size > 0) {
 150                 if (errbuf_size > len)
 151                         (void) strcpy(errbuf, s);
 152                 else {
 153                         (void) strncpy(errbuf, s, errbuf_size-1);
 154                         errbuf[errbuf_size-1] = '\0';
 155                 }
 156         }
 157
 158         return(len);
 159 }
 160
 161 /*
 162  - regatoi - internal routine to implement REG_ATOI
 163  == static char *regatoi(const regex_t *preg, char *localbuf);
 164  */
 165 static char *
 166 regatoi(const regex_t *preg, char *localbuf)
 167 {
 168 #if 0 /* we don't seem to use this and it gives a warning. */
 169         struct rerr *r;
 170         size_t siz;
 171         char *p;
 172
 173         for (r = rerrs; r->code != 0; r++)
 174                 if (strcmp(r->name, preg->re_endp) == 0)
 175                         break;
 176         if (r->code == 0)
 177                 return("0");
 178
 179         sprintf(localbuf, "%d", r->code);
 180 #else
 181         *localbuf = '\0';
 182 #endif
 183         return(localbuf);
 184 }