regex/regerror.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1992, 1993, 1994
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * This code is derived from software contributed to Berkeley by
  30  * Henry Spencer.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60
  61 #if defined(LIBC_SCCS) && !defined(lint)
  62 static char sccsid[] = "@(#)regerror.c  8.4 (Berkeley) 3/20/94";
  63 #endif /* LIBC_SCCS and not lint */
  64
  65 #include <sys/types.h>
  66 #include <stdio.h>
  67 #include <string.h>
  68 #include <ctype.h>
  69 #include <limits.h>
  70 #include <stdlib.h>
  71 #include <regex.h>
  72
  73 #include "utils.h"
  74
  75 /* ========= begin header generated by ./mkh ========= */
  76 #ifdef __cplusplus
  77 extern "C" {
  78 #endif
  79
  80 /* === regerror.c === */
  81 static char *regatoi __P((const regex_t *preg, char *localbuf));
  82
  83 #ifdef __cplusplus
  84 }
  85 #endif
  86 /* ========= end header generated by ./mkh ========= */
  87 /*
  88  = #define      REG_NOMATCH      1
  89  = #define      REG_BADPAT       2
  90  = #define      REG_ECOLLATE     3
  91  = #define      REG_ECTYPE       4
  92  = #define      REG_EESCAPE      5
  93  = #define      REG_ESUBREG      6
  94  = #define      REG_EBRACK       7
  95  = #define      REG_EPAREN       8
  96  = #define      REG_EBRACE       9
  97  = #define      REG_BADBR       10
  98  = #define      REG_ERANGE      11
  99  = #define      REG_ESPACE      12
 100  = #define      REG_BADRPT      13
 101  = #define      REG_EMPTY       14
 102  = #define      REG_ASSERT      15
 103  = #define      REG_INVARG      16
 104  = #define      REG_ATOI        255     // convert name to number (!)
 105  = #define      REG_ITOA        0400    // convert number to name (!)
 106  */
 107 static struct rerr {
 108         int code;
 109         char *name;
 110         char *explain;
 111 } rerrs[] = {
 112         REG_NOMATCH,    "REG_NOMATCH",  "regexec() failed to match",
 113         REG_BADPAT,     "REG_BADPAT",   "invalid regular expression",
 114         REG_ECOLLATE,   "REG_ECOLLATE", "invalid collating element",
 115         REG_ECTYPE,     "REG_ECTYPE",   "invalid character class",
 116         REG_EESCAPE,    "REG_EESCAPE",  "trailing backslash (\\)",
 117         REG_ESUBREG,    "REG_ESUBREG",  "invalid backreference number",
 118         REG_EBRACK,     "REG_EBRACK",   "brackets ([ ]) not balanced",
 119         REG_EPAREN,     "REG_EPAREN",   "parentheses not balanced",
 120         REG_EBRACE,     "REG_EBRACE",   "braces not balanced",
 121         REG_BADBR,      "REG_BADBR",    "invalid repetition count(s)",
 122         REG_ERANGE,     "REG_ERANGE",   "invalid character range",
 123         REG_ESPACE,     "REG_ESPACE",   "out of memory",
 124         REG_BADRPT,     "REG_BADRPT",   "repetition-operator operand invalid",
 125         REG_EMPTY,      "REG_EMPTY",    "empty (sub)expression",
 126         REG_ASSERT,     "REG_ASSERT",   "\"can't happen\" -- you found a bug",
 127         REG_INVARG,     "REG_INVARG",   "invalid argument to regex routine",
 128         0,              "",             "*** unknown regexp error code ***",
 129 };
 130
 131 /*
 132  - regerror - the interface to error numbers
 133  = extern size_t regerror(int, const regex_t *, char *, size_t);
 134  */
 135 /* ARGSUSED */
 136 size_t
 137 regerror(errcode, preg, errbuf, errbuf_size)
 138 int errcode;
 139 const regex_t *preg;
 140 char *errbuf;
 141 size_t errbuf_size;
 142 {
 143         register struct rerr *r;
 144         register size_t len;
 145         register int target = errcode &~ REG_ITOA;
 146         register char *s;
 147         char convbuf[50];
 148
 149         if (errcode == REG_ATOI)
 150                 s = regatoi(preg, convbuf);
 151         else {
 152                 for (r = rerrs; r->code != 0; r++)
 153                         if (r->code == target)
 154                                 break;
 155
 156                 if (errcode&REG_ITOA) {
 157                         if (r->code != 0)
 158                                 (void) strcpy(convbuf, r->name);
 159                         else
 160                                 sprintf(convbuf, "REG_0x%x", target);
 161                         assert(strlen(convbuf) < sizeof(convbuf));
 162                         s = convbuf;
 163                 } else
 164                         s = r->explain;
 165         }
 166
 167         len = strlen(s) + 1;
 168         if (errbuf_size > 0) {
 169                 if (errbuf_size > len)
 170                         (void) strcpy(errbuf, s);
 171                 else {
 172                         (void) strncpy(errbuf, s, errbuf_size-1);
 173                         errbuf[errbuf_size-1] = '\0';
 174                 }
 175         }
 176
 177         return(len);
 178 }
 179
 180 /*
 181  - regatoi - internal routine to implement REG_ATOI
 182  == static char *regatoi(const regex_t *preg, char *localbuf);
 183  */
 184 static char *
 185 regatoi(preg, localbuf)
 186 const regex_t *preg;
 187 char *localbuf;
 188 {
 189         register struct rerr *r;
 190         register size_t siz;
 191         register char *p;
 192
 193         for (r = rerrs; r->code != 0; r++)
 194                 if (strcmp(r->name, preg->re_endp) == 0)
 195                         break;
 196         if (r->code == 0)
 197                 return("0");
 198
 199         sprintf(localbuf, "%d", r->code);
 200         return(localbuf);
 201 }