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 #ifdef HAVE_CONFIG_H
  49 #include <config.h>
  50 #endif
  51
  52 #include <roken.h>
  53
  54 #include <fnmatch.h>
  55 #include <string.h>
  56
  57 #define EOS     '\0'
  58
  59 static const char *rangematch (const char *, int, int);
  60
  61 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
  62 rk_fnmatch(const char *pattern, const char *string, int flags)
  63 {
  64         const char *stringstart;
  65         char c, test;
  66
  67         for (stringstart = string;;)
  68                 switch (c = *pattern++) {
  69                 case EOS:
  70                         return (*string == EOS ? 0 : FNM_NOMATCH);
  71                 case '?':
  72                         if (*string == EOS)
  73                                 return (FNM_NOMATCH);
  74                         if (*string == '/' && (flags & FNM_PATHNAME))
  75                                 return (FNM_NOMATCH);
  76                         if (*string == '.' && (flags & FNM_PERIOD) &&
  77                             (string == stringstart ||
  78                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  79                                 return (FNM_NOMATCH);
  80                         ++string;
  81                         break;
  82                 case '*':
  83                         c = *pattern;
  84                         /* Collapse multiple stars. */
  85                         while (c == '*')
  86                                 c = *++pattern;
  87
  88                         if (*string == '.' && (flags & FNM_PERIOD) &&
  89                             (string == stringstart ||
  90                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  91                                 return (FNM_NOMATCH);
  92
  93                         /* Optimize for pattern with * at end or before /. */
  94                         if (c == EOS)
  95                                 if (flags & FNM_PATHNAME)
  96                                         return (strchr(string, '/') == NULL ?
  97                                             0 : FNM_NOMATCH);
  98                                 else
  99                                         return (0);
 100                         else if (c == '/' && flags & FNM_PATHNAME) {
 101                                 if ((string = strchr(string, '/')) == NULL)
 102                                         return (FNM_NOMATCH);
 103                                 break;
 104                         }
 105
 106                         /* General case, use recursion. */
 107                         while ((test = *string) != EOS) {
 108                                 if (!rk_fnmatch(pattern, string, flags & ~FNM_PERIOD))
 109                                         return (0);
 110                                 if (test == '/' && flags & FNM_PATHNAME)
 111                                         break;
 112                                 ++string;
 113                         }
 114                         return (FNM_NOMATCH);
 115                 case '[':
 116                         if (*string == EOS)
 117                                 return (FNM_NOMATCH);
 118                         if (*string == '/' && flags & FNM_PATHNAME)
 119                                 return (FNM_NOMATCH);
 120                         if ((pattern =
 121                             rangematch(pattern, *string, flags)) == NULL)
 122                                 return (FNM_NOMATCH);
 123                         ++string;
 124                         break;
 125                 case '\\':
 126                         if (!(flags & FNM_NOESCAPE)) {
 127                                 if ((c = *pattern++) == EOS) {
 128                                         c = '\\';
 129                                         --pattern;
 130                                 }
 131                         }
 132                         /* FALLTHROUGH */
 133                 default:
 134                         if (c != *string++)
 135                                 return (FNM_NOMATCH);
 136                         break;
 137                 }
 138         /* NOTREACHED */
 139 }
 140
 141 static const char *
 142 rangematch(const char *pattern, int test, int flags)
 143 {
 144         int negate, ok;
 145         char c, c2;
 146
 147         /*
 148          * A bracket expression starting with an unquoted circumflex
 149          * character produces unspecified results (IEEE 1003.2-1992,
 150          * 3.13.2).  This implementation treats it like '!', for
 151          * consistency with the regular expression syntax.
 152          * J.T. Conklin (conklin@ngai.kaleida.com)
 153          */
 154         if (negate = (*pattern == '!' || *pattern == '^'))
 155                 ++pattern;
 156
 157         for (ok = 0; (c = *pattern++) != ']';) {
 158                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 159                         c = *pattern++;
 160                 if (c == EOS)
 161                         return (NULL);
 162                 if (*pattern == '-'
 163                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 164                         pattern += 2;
 165                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 166                                 c2 = *pattern++;
 167                         if (c2 == EOS)
 168                                 return (NULL);
 169                         if (c <= test && test <= c2)
 170                                 ok = 1;
 171                 } else if (c == test)
 172                         ok = 1;
 173         }
 174         return (ok == negate ? NULL : pattern);
 175 }