crypto/heimdal-0.6.3/lib/roken/fnmatch.c

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