lib/libc/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  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)regerror.c  8.4 (Berkeley) 3/20/94
  34  * $FreeBSD: src/lib/libc/regex/regerror.c,v 1.11 2007/06/11 03:05:54 delphij Exp $
  35  * $DragonFly: src/lib/libc/regex/regerror.c,v 1.6 2005/11/13 02:17:18 swildner Exp $
  36  */
  37
  38 #include <sys/types.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <limits.h>
  42 #include <stdlib.h>
  43 #include <regex.h>
  44
  45 #include "utils.h"
  46
  47 /* ========= begin header generated by ./mkh ========= */
  48 #ifdef __cplusplus
  49 extern "C" {
  50 #endif
  51
  52 /* === regerror.c === */
  53 static char *regatoi(const regex_t *preg, char *localbuf);
  54
  55 #ifdef __cplusplus
  56 }
  57 #endif
  58 /* ========= end header generated by ./mkh ========= */
  59 /*
  60  = #define      REG_NOMATCH      1
  61  = #define      REG_BADPAT       2
  62  = #define      REG_ECOLLATE     3
  63  = #define      REG_ECTYPE       4
  64  = #define      REG_EESCAPE      5
  65  = #define      REG_ESUBREG      6
  66  = #define      REG_EBRACK       7
  67  = #define      REG_EPAREN       8
  68  = #define      REG_EBRACE       9
  69  = #define      REG_BADBR       10
  70  = #define      REG_ERANGE      11
  71  = #define      REG_ESPACE      12
  72  = #define      REG_BADRPT      13
  73  = #define      REG_EMPTY       14
  74  = #define      REG_ASSERT      15
  75  = #define      REG_INVARG      16
  76  = #define      REG_ILLSEQ      17
  77  = #define      REG_ATOI        255     // convert name to number (!)
  78  = #define      REG_ITOA        0400    // convert number to name (!)
  79  */
  80 static struct rerr {
  81         int code;
  82         char *name;
  83         char *explain;
  84 } rerrs[] = {
  85         {REG_NOMATCH,   "REG_NOMATCH",  "regexec() failed to match"},
  86         {REG_BADPAT,    "REG_BADPAT",   "invalid regular expression"},
  87         {REG_ECOLLATE,  "REG_ECOLLATE", "invalid collating element"},
  88         {REG_ECTYPE,    "REG_ECTYPE",   "invalid character class"},
  89         {REG_EESCAPE,   "REG_EESCAPE",  "trailing backslash (\\)"},
  90         {REG_ESUBREG,   "REG_ESUBREG",  "invalid backreference number"},
  91         {REG_EBRACK,    "REG_EBRACK",   "brackets ([ ]) not balanced"},
  92         {REG_EPAREN,    "REG_EPAREN",   "parentheses not balanced"},
  93         {REG_EBRACE,    "REG_EBRACE",   "braces not balanced"},
  94         {REG_BADBR,     "REG_BADBR",    "invalid repetition count(s)"},
  95         {REG_ERANGE,    "REG_ERANGE",   "invalid character range"},
  96         {REG_ESPACE,    "REG_ESPACE",   "out of memory"},
  97         {REG_BADRPT,    "REG_BADRPT",   "repetition-operator operand invalid"},
  98         {REG_EMPTY,     "REG_EMPTY",    "empty (sub)expression"},
  99         {REG_ASSERT,    "REG_ASSERT",   "\"can't happen\" -- you found a bug"},
 100         {REG_INVARG,    "REG_INVARG",   "invalid argument to regex routine"},
 101         {REG_ILLSEQ,    "REG_ILLSEQ",   "illegal byte sequence"},
 102         {0,             "",             "*** unknown regexp error code ***"}
 103 };
 104
 105 /*
 106  - regerror - the interface to error numbers
 107  = extern size_t regerror(int, const regex_t *, char *, size_t);
 108  */
 109 /* ARGSUSED */
 110 size_t
 111 regerror(int errcode,
 112          const regex_t * __restrict preg,
 113          char * __restrict errbuf,
 114          size_t errbuf_size)
 115 {
 116         struct rerr *r;
 117         size_t len;
 118         int target = errcode &~ REG_ITOA;
 119         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                                 strcpy(convbuf, r->name);
 132                         else
 133                                 sprintf(convbuf, "REG_0x%x", target);
 134                         assert(strlen(convbuf) < sizeof(convbuf));
 135                         s = convbuf;
 136                 } else
 137                         s = r->explain;
 138         }
 139
 140         len = strlen(s) + 1;
 141         if (errbuf_size > 0) {
 142                 if (errbuf_size > len)
 143                         strcpy(errbuf, s);
 144                 else {
 145                         strncpy(errbuf, s, errbuf_size-1);
 146                         errbuf[errbuf_size-1] = '\0';
 147                 }
 148         }
 149
 150         return(len);
 151 }
 152
 153 /*
 154  - regatoi - internal routine to implement REG_ATOI
 155  == static char *regatoi(const regex_t *preg, char *localbuf);
 156  */
 157 static char *
 158 regatoi(const regex_t *preg, char *localbuf)
 159 {
 160         struct rerr *r;
 161
 162         for (r = rerrs; r->code != 0; r++)
 163                 if (strcmp(r->name, preg->re_endp) == 0)
 164                         break;
 165         if (r->code == 0)
 166                 return("0");
 167
 168         sprintf(localbuf, "%d", r->code);
 169         return(localbuf);
 170 }