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