regex.subproj/regerror.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1992, 1993, 1994
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * This code is derived from software contributed to Berkeley by
  27  * Henry Spencer.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #if defined(LIBC_SCCS) && !defined(lint)
  59 static char sccsid[] = "@(#)regerror.c  8.4 (Berkeley) 3/20/94";
  60 #endif /* LIBC_SCCS and not lint */
  61
  62 #include <sys/types.h>
  63 #include <stdio.h>
  64 #include <string.h>
  65 #include <ctype.h>
  66 #include <limits.h>
  67 #include <stdlib.h>
  68 #include <regex.h>
  69
  70 #include "utils.h"
  71
  72 /* ========= begin header generated by ./mkh ========= */
  73 #ifdef __cplusplus
  74 extern "C" {
  75 #endif
  76
  77 /* === regerror.c === */
  78 static char *regatoi __P((const regex_t *preg, char *localbuf));
  79
  80 #ifdef __cplusplus
  81 }
  82 #endif
  83 /* ========= end header generated by ./mkh ========= */
  84 /*
  85  = #define      REG_NOMATCH      1
  86  = #define      REG_BADPAT       2
  87  = #define      REG_ECOLLATE     3
  88  = #define      REG_ECTYPE       4
  89  = #define      REG_EESCAPE      5
  90  = #define      REG_ESUBREG      6
  91  = #define      REG_EBRACK       7
  92  = #define      REG_EPAREN       8
  93  = #define      REG_EBRACE       9
  94  = #define      REG_BADBR       10
  95  = #define      REG_ERANGE      11
  96  = #define      REG_ESPACE      12
  97  = #define      REG_BADRPT      13
  98  = #define      REG_EMPTY       14
  99  = #define      REG_ASSERT      15
 100  = #define      REG_INVARG      16
 101  = #define      REG_ATOI        255     // convert name to number (!)
 102  = #define      REG_ITOA        0400    // convert number to name (!)
 103  */
 104 static struct rerr {
 105         int code;
 106         char *name;
 107         char *explain;
 108 } rerrs[] = {
 109         REG_NOMATCH,    "REG_NOMATCH",  "regexec() failed to match",
 110         REG_BADPAT,     "REG_BADPAT",   "invalid regular expression",
 111         REG_ECOLLATE,   "REG_ECOLLATE", "invalid collating element",
 112         REG_ECTYPE,     "REG_ECTYPE",   "invalid character class",
 113         REG_EESCAPE,    "REG_EESCAPE",  "trailing backslash (\\)",
 114         REG_ESUBREG,    "REG_ESUBREG",  "invalid backreference number",
 115         REG_EBRACK,     "REG_EBRACK",   "brackets ([ ]) not balanced",
 116         REG_EPAREN,     "REG_EPAREN",   "parentheses not balanced",
 117         REG_EBRACE,     "REG_EBRACE",   "braces not balanced",
 118         REG_BADBR,      "REG_BADBR",    "invalid repetition count(s)",
 119         REG_ERANGE,     "REG_ERANGE",   "invalid character range",
 120         REG_ESPACE,     "REG_ESPACE",   "out of memory",
 121         REG_BADRPT,     "REG_BADRPT",   "repetition-operator operand invalid",
 122         REG_EMPTY,      "REG_EMPTY",    "empty (sub)expression",
 123         REG_ASSERT,     "REG_ASSERT",   "\"can't happen\" -- you found a bug",
 124         REG_INVARG,     "REG_INVARG",   "invalid argument to regex routine",
 125         0,              "",             "*** unknown regexp error code ***",
 126 };
 127
 128 /*
 129  - regerror - the interface to error numbers
 130  = extern size_t regerror(int, const regex_t *, char *, size_t);
 131  */
 132 /* ARGSUSED */
 133 size_t
 134 regerror(errcode, preg, errbuf, errbuf_size)
 135 int errcode;
 136 const regex_t *preg;
 137 char *errbuf;
 138 size_t errbuf_size;
 139 {
 140         register struct rerr *r;
 141         register size_t len;
 142         register int target = errcode &~ REG_ITOA;
 143         register char *s;
 144         char convbuf[50];
 145
 146         if (errcode == REG_ATOI)
 147                 s = regatoi(preg, convbuf);
 148         else {
 149                 for (r = rerrs; r->code != 0; r++)
 150                         if (r->code == target)
 151                                 break;
 152
 153                 if (errcode&REG_ITOA) {
 154                         if (r->code != 0)
 155                                 (void) strcpy(convbuf, r->name);
 156                         else
 157                                 sprintf(convbuf, "REG_0x%x", target);
 158                         assert(strlen(convbuf) < sizeof(convbuf));
 159                         s = convbuf;
 160                 } else
 161                         s = r->explain;
 162         }
 163
 164         len = strlen(s) + 1;
 165         if (errbuf_size > 0) {
 166                 if (errbuf_size > len)
 167                         (void) strcpy(errbuf, s);
 168                 else {
 169                         (void) strncpy(errbuf, s, errbuf_size-1);
 170                         errbuf[errbuf_size-1] = '\0';
 171                 }
 172         }
 173
 174         return(len);
 175 }
 176
 177 /*
 178  - regatoi - internal routine to implement REG_ATOI
 179  == static char *regatoi(const regex_t *preg, char *localbuf);
 180  */
 181 static char *
 182 regatoi(preg, localbuf)
 183 const regex_t *preg;
 184 char *localbuf;
 185 {
 186         register struct rerr *r;
 187         register size_t siz;
 188         register char *p;
 189
 190         for (r = rerrs; r->code != 0; r++)
 191                 if (strcmp(r->name, preg->re_endp) == 0)
 192                         break;
 193         if (r->code == 0)
 194                 return("0");
 195
 196         sprintf(localbuf, "%d", r->code);
 197         return(localbuf);
 198 }