crypto/external/bsd/heimdal/dist/lib/roken/fnmatch.c

   1 /*      $NetBSD: fnmatch.c,v 1.1.1.2 2014/04/24 12:45:52 pettai Exp $   */
   2
   3 /*      NetBSD: fnmatch.c,v 1.11 1995/02/27 03:43:06 cgd Exp    */
   4
   5 /*
   6  * Copyright (c) 1989, 1993, 1994
   7  *      The Regents of the University of California.  All rights reserved.
   8  *
   9  * This code is derived from software contributed to Berkeley by
  10  * Guido van Rossum.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 #if 0
  39 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
  40 #else
  41 static char rcsid[] = "NetBSD: fnmatch.c,v 1.11 1995/02/27 03:43:06 cgd Exp";
  42 #endif
  43 #endif /* LIBC_SCCS and not lint */
  44
  45 /*
  46  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  47  * Compares a filename or pathname to a pattern.
  48  */
  49
  50 #ifdef HAVE_CONFIG_H
  51 #include <config.h>
  52 #endif
  53
  54 #include <krb5/roken.h>
  55
  56 #include <fnmatch.h>
  57 #include <string.h>
  58
  59 #define EOS     '\0'
  60
  61 static const char *rangematch (const char *, int, int);
  62
  63 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
  64 rk_fnmatch(const char *pattern, const char *string, int flags)
  65 {
  66         const char *stringstart;
  67         char c, test;
  68
  69         for (stringstart = string;;)
  70                 switch (c = *pattern++) {
  71                 case EOS:
  72                         return (*string == EOS ? 0 : FNM_NOMATCH);
  73                 case '?':
  74                         if (*string == EOS)
  75                                 return (FNM_NOMATCH);
  76                         if (*string == '/' && (flags & FNM_PATHNAME))
  77                                 return (FNM_NOMATCH);
  78                         if (*string == '.' && (flags & FNM_PERIOD) &&
  79                             (string == stringstart ||
  80                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  81                                 return (FNM_NOMATCH);
  82                         ++string;
  83                         break;
  84                 case '*':
  85                         c = *pattern;
  86                         /* Collapse multiple stars. */
  87                         while (c == '*')
  88                                 c = *++pattern;
  89
  90                         if (*string == '.' && (flags & FNM_PERIOD) &&
  91                             (string == stringstart ||
  92                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  93                                 return (FNM_NOMATCH);
  94
  95                         /* Optimize for pattern with * at end or before /. */
  96                         if (c == EOS)
  97                                 if (flags & FNM_PATHNAME)
  98                                         return (strchr(string, '/') == NULL ?
  99                                             0 : FNM_NOMATCH);
 100                                 else
 101                                         return (0);
 102                         else if (c == '/' && flags & FNM_PATHNAME) {
 103                                 if ((string = strchr(string, '/')) == NULL)
 104                                         return (FNM_NOMATCH);
 105                                 break;
 106                         }
 107
 108                         /* General case, use recursion. */
 109                         while ((test = *string) != EOS) {
 110                                 if (!rk_fnmatch(pattern, string, flags & ~FNM_PERIOD))
 111                                         return (0);
 112                                 if (test == '/' && flags & FNM_PATHNAME)
 113                                         break;
 114                                 ++string;
 115                         }
 116                         return (FNM_NOMATCH);
 117                 case '[':
 118                         if (*string == EOS)
 119                                 return (FNM_NOMATCH);
 120                         if (*string == '/' && flags & FNM_PATHNAME)
 121                                 return (FNM_NOMATCH);
 122                         if ((pattern =
 123                             rangematch(pattern, *string, flags)) == NULL)
 124                                 return (FNM_NOMATCH);
 125                         ++string;
 126                         break;
 127                 case '\\':
 128                         if (!(flags & FNM_NOESCAPE)) {
 129                                 if ((c = *pattern++) == EOS) {
 130                                         c = '\\';
 131                                         --pattern;
 132                                 }
 133                         }
 134                         /* FALLTHROUGH */
 135                 default:
 136                         if (c != *string++)
 137                                 return (FNM_NOMATCH);
 138                         break;
 139                 }
 140         /* NOTREACHED */
 141 }
 142
 143 static const char *
 144 rangematch(const char *pattern, int test, int flags)
 145 {
 146         int negate, ok;
 147         char c, c2;
 148
 149         /*
 150          * A bracket expression starting with an unquoted circumflex
 151          * character produces unspecified results (IEEE 1003.2-1992,
 152          * 3.13.2).  This implementation treats it like '!', for
 153          * consistency with the regular expression syntax.
 154          * J.T. Conklin (conklin@ngai.kaleida.com)
 155          */
 156         if (negate = (*pattern == '!' || *pattern == '^'))
 157                 ++pattern;
 158
 159         for (ok = 0; (c = *pattern++) != ']';) {
 160                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 161                         c = *pattern++;
 162                 if (c == EOS)
 163                         return (NULL);
 164                 if (*pattern == '-'
 165                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 166                         pattern += 2;
 167                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 168                                 c2 = *pattern++;
 169                         if (c2 == EOS)
 170                                 return (NULL);
 171                         if (c <= test && test <= c2)
 172                                 ok = 1;
 173                 } else if (c == test)
 174                         ok = 1;
 175         }
 176         return (ok == negate ? NULL : pattern);
 177 }