regex/FreeBSD/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  */
  35
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 static char sccsid[] = "@(#)regerror.c  8.4 (Berkeley) 3/20/94";
  38 #endif /* LIBC_SCCS and not lint */
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD: src/lib/libc/regex/regerror.c,v 1.11 2007/06/11 03:05:54 delphij Exp $");
  41
  42 #include <sys/types.h>
  43 #include <stdio.h>
  44 #include <string.h>
  45 #include <limits.h>
  46 #include <stdlib.h>
  47 #include <regex.h>
  48
  49 #include "utils.h"
  50
  51 /* ========= begin header generated by ./mkh ========= */
  52 #ifdef __cplusplus
  53 extern "C" {
  54 #endif
  55
  56 /* === regerror.c === */
  57 static char *regatoi(const regex_t *preg, char *localbuf);
  58
  59 #ifdef __cplusplus
  60 }
  61 #endif
  62 /* ========= end header generated by ./mkh ========= */
  63 /*
  64  = #define      REG_NOMATCH      1
  65  = #define      REG_BADPAT       2
  66  = #define      REG_ECOLLATE     3
  67  = #define      REG_ECTYPE       4
  68  = #define      REG_EESCAPE      5
  69  = #define      REG_ESUBREG      6
  70  = #define      REG_EBRACK       7
  71  = #define      REG_EPAREN       8
  72  = #define      REG_EBRACE       9
  73  = #define      REG_BADBR       10
  74  = #define      REG_ERANGE      11
  75  = #define      REG_ESPACE      12
  76  = #define      REG_BADRPT      13
  77  = #define      REG_EMPTY       14
  78  = #define      REG_ASSERT      15
  79  = #define      REG_INVARG      16
  80  = #define      REG_ILLSEQ      17
  81  = #define      REG_ATOI        255     // convert name to number (!)
  82  = #define      REG_ITOA        0400    // convert number to name (!)
  83  */
  84 static const 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         {REG_ILLSEQ,    "REG_ILLSEQ",   "illegal byte sequence"},
 106         {0,             "",             "*** unknown regexp error code ***"}
 107 };
 108
 109 /*
 110  - regerror - the interface to error numbers
 111  = extern size_t regerror(int, const regex_t *, char *, size_t);
 112  */
 113 /* ARGSUSED */
 114 size_t
 115 regerror(int errcode,
 116          const regex_t * __restrict preg,
 117          char * __restrict errbuf,
 118          size_t errbuf_size)
 119 {
 120         const struct rerr *r;
 121         size_t len;
 122         int target = errcode &~ REG_ITOA;
 123         const char *s;
 124         char convbuf[50];
 125
 126         if (errcode == REG_ATOI)
 127                 s = regatoi(preg, convbuf);
 128         else {
 129                 for (r = rerrs; r->code != 0; r++)
 130                         if (r->code == target)
 131                                 break;
 132
 133                 if (errcode&REG_ITOA) {
 134                         if (r->code != 0)
 135                                 (void) strcpy(convbuf, r->name);
 136                         else
 137                                 sprintf(convbuf, "REG_0x%x", target);
 138                         assert(strlen(convbuf) < sizeof(convbuf));
 139                         s = convbuf;
 140                 } else
 141                         s = r->explain;
 142         }
 143
 144         len = strlen(s) + 1;
 145         if (errbuf_size > 0) {
 146                 if (errbuf_size > len)
 147                         (void) strcpy(errbuf, s);
 148                 else {
 149                         (void) strncpy(errbuf, s, errbuf_size-1);
 150                         errbuf[errbuf_size-1] = '\0';
 151                 }
 152         }
 153
 154         return(len);
 155 }
 156
 157 /*
 158  - regatoi - internal routine to implement REG_ATOI
 159  == static char *regatoi(const regex_t *preg, char *localbuf);
 160  */
 161 static char *
 162 regatoi(const regex_t *preg, char *localbuf)
 163 {
 164         const struct rerr *r;
 165
 166         for (r = rerrs; r->code != 0; r++)
 167                 if (strcmp(r->name, preg->re_endp) == 0)
 168                         break;
 169         if (r->code == 0)
 170                 return("0");
 171
 172         sprintf(localbuf, "%d", r->code);
 173         return(localbuf);
 174 }