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   1 /*
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Guido van Rossum.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  35  * Compares a filename or pathname to a pattern.
  36  */
  37
  38 #include <config.h>
  39
  40 #include <stdio.h>
  41 #include <ctype.h>
  42 #ifdef HAVE_STRING_H
  43 # include <string.h>
  44 #else
  45 # ifdef HAVE_STRINGS_H
  46 #  include <strings.h>
  47 # endif
  48 #endif /* HAVE_STRING_H */
  49
  50 #include <compat.h>
  51 #include "emul/fnmatch.h"
  52
  53 #undef  EOS
  54 #define EOS     '\0'
  55
  56 #define RANGE_MATCH     1
  57 #define RANGE_NOMATCH   0
  58 #define RANGE_ERROR     (-1)
  59
  60 #if defined(LIBC_SCCS) && !defined(lint)
  61 __unused static char rcsid[] = "$OpenBSD: fnmatch.c,v 1.6 1998/03/19 00:29:59 millert Exp $";
  62 #endif /* LIBC_SCCS and not lint */
  63
  64 static int rangematch __P((const char *, char, int, char **));
  65
  66 int
  67 fnmatch(pattern, string, flags)
  68         const char *pattern, *string;
  69         int flags;
  70 {
  71         const char *stringstart;
  72         char *newp;
  73         char c, test;
  74
  75         for (stringstart = string;;)
  76                 switch (c = *pattern++) {
  77                 case EOS:
  78                         if (ISSET(flags, FNM_LEADING_DIR) && *string == '/')
  79                                 return (0);
  80                         return (*string == EOS ? 0 : FNM_NOMATCH);
  81                 case '?':
  82                         if (*string == EOS)
  83                                 return (FNM_NOMATCH);
  84                         if (*string == '/' && ISSET(flags, FNM_PATHNAME))
  85                                 return (FNM_NOMATCH);
  86                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
  87                             (string == stringstart ||
  88                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
  89                                 return (FNM_NOMATCH);
  90                         ++string;
  91                         break;
  92                 case '*':
  93                         c = *pattern;
  94                         /* Collapse multiple stars. */
  95                         while (c == '*')
  96                                 c = *++pattern;
  97
  98                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
  99                             (string == stringstart ||
 100                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
 101                                 return (FNM_NOMATCH);
 102
 103                         /* Optimize for pattern with * at end or before /. */
 104                         if (c == EOS) {
 105                                 if (ISSET(flags, FNM_PATHNAME))
 106                                         return (ISSET(flags, FNM_LEADING_DIR) ||
 107                                             strchr(string, '/') == NULL ?
 108                                             0 : FNM_NOMATCH);
 109                                 else
 110                                         return (0);
 111                         } else if (c == '/' && ISSET(flags, FNM_PATHNAME)) {
 112                                 if ((string = strchr(string, '/')) == NULL)
 113                                         return (FNM_NOMATCH);
 114                                 break;
 115                         }
 116
 117                         /* General case, use recursion. */
 118                         while ((test = *string) != EOS) {
 119                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 120                                         return (0);
 121                                 if (test == '/' && ISSET(flags, FNM_PATHNAME))
 122                                         break;
 123                                 ++string;
 124                         }
 125                         return (FNM_NOMATCH);
 126                 case '[':
 127                         if (*string == EOS)
 128                                 return (FNM_NOMATCH);
 129                         if (*string == '/' && ISSET(flags, FNM_PATHNAME))
 130                                 return (FNM_NOMATCH);
 131                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
 132                             (string == stringstart ||
 133                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
 134                                 return (FNM_NOMATCH);
 135
 136                         switch (rangematch(pattern, *string, flags, &newp)) {
 137                         case RANGE_ERROR:
 138                                 /* not a good range, treat as normal text */
 139                                 goto normal;
 140                         case RANGE_MATCH:
 141                                 pattern = newp;
 142                                 break;
 143                         case RANGE_NOMATCH:
 144                                 return (FNM_NOMATCH);
 145                         }
 146                         ++string;
 147                         break;
 148                 case '\\':
 149                         if (!ISSET(flags, FNM_NOESCAPE)) {
 150                                 if ((c = *pattern++) == EOS) {
 151                                         c = '\\';
 152                                         --pattern;
 153                                 }
 154                         }
 155                         /* FALLTHROUGH */
 156                 default:
 157                 normal:
 158                         if (c != *string && !(ISSET(flags, FNM_CASEFOLD) &&
 159                                  (tolower((unsigned char)c) ==
 160                                  tolower((unsigned char)*string))))
 161                                 return (FNM_NOMATCH);
 162                         ++string;
 163                         break;
 164                 }
 165         /* NOTREACHED */
 166 }
 167
 168 static int
 169 #ifdef __STDC__
 170 rangematch(const char *pattern, char test, int flags, char **newp)
 171 #else
 172 rangematch(pattern, test, flags, newp)
 173         const char *pattern;
 174         char test;
 175         int flags;
 176         char **newp;
 177 #endif
 178 {
 179         int negate, ok;
 180         char c, c2;
 181
 182         /*
 183          * A bracket expression starting with an unquoted circumflex
 184          * character produces unspecified results (IEEE 1003.2-1992,
 185          * 3.13.2).  This implementation treats it like '!', for
 186          * consistency with the regular expression syntax.
 187          * J.T. Conklin (conklin@ngai.kaleida.com)
 188          */
 189         if ((negate = (*pattern == '!' || *pattern == '^')))
 190                 ++pattern;
 191
 192         if (ISSET(flags, FNM_CASEFOLD))
 193                 test = tolower((unsigned char)test);
 194
 195         /*
 196          * A right bracket shall lose its special meaning and represent
 197          * itself in a bracket expression if it occurs first in the list.
 198          * -- POSIX.2 2.8.3.2
 199          */
 200         ok = 0;
 201         c = *pattern++;
 202         do {
 203                 if (c == '\\' && !ISSET(flags, FNM_NOESCAPE))
 204                         c = *pattern++;
 205                 if (c == EOS)
 206                         return (RANGE_ERROR);
 207                 if (c == '/' && ISSET(flags, FNM_PATHNAME))
 208                         return (RANGE_NOMATCH);
 209                 if (ISSET(flags, FNM_CASEFOLD))
 210                         c = tolower((unsigned char)c);
 211                 if (*pattern == '-'
 212                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 213                         pattern += 2;
 214                         if (c2 == '\\' && !ISSET(flags, FNM_NOESCAPE))
 215                                 c2 = *pattern++;
 216                         if (c2 == EOS)
 217                                 return (RANGE_ERROR);
 218                         if (ISSET(flags, FNM_CASEFOLD))
 219                                 c2 = tolower((unsigned char)c2);
 220                         if (c <= test && test <= c2)
 221                                 ok = 1;
 222                 } else if (c == test)
 223                         ok = 1;
 224         } while ((c = *pattern++) != ']');
 225
 226         *newp = (char *)pattern;
 227         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 228 }