gen/FreeBSD/fnmatch.c

   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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. 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 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
  39 #endif /* LIBC_SCCS and not lint */
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD: src/lib/libc/gen/fnmatch.c,v 1.15 2002/02/01 01:32:19 obrien Exp $");
  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 <ctype.h>
  49 #include <fnmatch.h>
  50 #include <string.h>
  51 #include <stdio.h>
  52
  53 #include "collate.h"
  54
  55 #define EOS     '\0'
  56
  57 #define RANGE_MATCH     1
  58 #define RANGE_NOMATCH   0
  59 #define RANGE_ERROR     (-1)
  60
  61 static int rangematch(const char *, char, int, char **);
  62
  63 int
  64 fnmatch(pattern, string, flags)
  65         const char *pattern, *string;
  66         int flags;
  67 {
  68         const char *stringstart;
  69         char *newp;
  70         char c, test;
  71
  72         for (stringstart = string;;)
  73                 switch (c = *pattern++) {
  74                 case EOS:
  75                         if ((flags & FNM_LEADING_DIR) && *string == '/')
  76                                 return (0);
  77                         return (*string == EOS ? 0 : FNM_NOMATCH);
  78                 case '?':
  79                         if (*string == EOS)
  80                                 return (FNM_NOMATCH);
  81                         if (*string == '/' && (flags & FNM_PATHNAME))
  82                                 return (FNM_NOMATCH);
  83                         if (*string == '.' && (flags & FNM_PERIOD) &&
  84                             (string == stringstart ||
  85                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  86                                 return (FNM_NOMATCH);
  87                         ++string;
  88                         break;
  89                 case '*':
  90                         c = *pattern;
  91                         /* Collapse multiple stars. */
  92                         while (c == '*')
  93                                 c = *++pattern;
  94
  95                         if (*string == '.' && (flags & FNM_PERIOD) &&
  96                             (string == stringstart ||
  97                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  98                                 return (FNM_NOMATCH);
  99
 100                         /* Optimize for pattern with * at end or before /. */
 101                         if (c == EOS)
 102                                 if (flags & FNM_PATHNAME)
 103                                         return ((flags & FNM_LEADING_DIR) ||
 104                                             strchr(string, '/') == NULL ?
 105                                             0 : FNM_NOMATCH);
 106                                 else
 107                                         return (0);
 108                         else if (c == '/' && flags & FNM_PATHNAME) {
 109                                 if ((string = strchr(string, '/')) == NULL)
 110                                         return (FNM_NOMATCH);
 111                                 break;
 112                         }
 113
 114                         /* General case, use recursion. */
 115                         while ((test = *string) != EOS) {
 116                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 117                                         return (0);
 118                                 if (test == '/' && flags & FNM_PATHNAME)
 119                                         break;
 120                                 ++string;
 121                         }
 122                         return (FNM_NOMATCH);
 123                 case '[':
 124                         if (*string == EOS)
 125                                 return (FNM_NOMATCH);
 126                         if (*string == '/' && (flags & FNM_PATHNAME))
 127                                 return (FNM_NOMATCH);
 128                         if (*string == '.' && (flags & FNM_PERIOD) &&
 129                             (string == stringstart ||
 130                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 131                                 return (FNM_NOMATCH);
 132
 133                         switch (rangematch(pattern, *string, flags, &newp)) {
 134                         case RANGE_ERROR:
 135                                 goto norm;
 136                         case RANGE_MATCH:
 137                                 pattern = newp;
 138                                 break;
 139                         case RANGE_NOMATCH:
 140                                 return (FNM_NOMATCH);
 141                         }
 142                         ++string;
 143                         break;
 144                 case '\\':
 145                         if (!(flags & FNM_NOESCAPE)) {
 146                                 if ((c = *pattern++) == EOS) {
 147                                         c = '\\';
 148                                         --pattern;
 149                                 }
 150                         }
 151                         /* FALLTHROUGH */
 152                 default:
 153                 norm:
 154                         if (c == *string)
 155                                 ;
 156                         else if ((flags & FNM_CASEFOLD) &&
 157                                  (tolower((unsigned char)c) ==
 158                                   tolower((unsigned char)*string)))
 159                                 ;
 160                         else
 161                                 return (FNM_NOMATCH);
 162                         string++;
 163                         break;
 164                 }
 165         /* NOTREACHED */
 166 }
 167
 168 static int
 169 rangematch(pattern, test, flags, newp)
 170         const char *pattern;
 171         char test;
 172         int flags;
 173         char **newp;
 174 {
 175         int negate, ok;
 176         char c, c2;
 177
 178         /*
 179          * A bracket expression starting with an unquoted circumflex
 180          * character produces unspecified results (IEEE 1003.2-1992,
 181          * 3.13.2).  This implementation treats it like '!', for
 182          * consistency with the regular expression syntax.
 183          * J.T. Conklin (conklin@ngai.kaleida.com)
 184          */
 185         if ( (negate = (*pattern == '!' || *pattern == '^')) )
 186                 ++pattern;
 187
 188         if (flags & FNM_CASEFOLD)
 189                 test = tolower((unsigned char)test);
 190
 191         /*
 192          * A right bracket shall lose its special meaning and represent
 193          * itself in a bracket expression if it occurs first in the list.
 194          * -- POSIX.2 2.8.3.2
 195          */
 196         ok = 0;
 197         c = *pattern++;
 198         do {
 199                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 200                         c = *pattern++;
 201                 if (c == EOS)
 202                         return (RANGE_ERROR);
 203
 204                 if (c == '/' && (flags & FNM_PATHNAME))
 205                         return (RANGE_NOMATCH);
 206
 207                 if (flags & FNM_CASEFOLD)
 208                         c = tolower((unsigned char)c);
 209
 210                 if (*pattern == '-'
 211                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 212                         pattern += 2;
 213                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 214                                 c2 = *pattern++;
 215                         if (c2 == EOS)
 216                                 return (RANGE_ERROR);
 217
 218                         if (flags & FNM_CASEFOLD)
 219                                 c2 = tolower((unsigned char)c2);
 220
 221                         if (__collate_load_error ?
 222                             c <= test && test <= c2 :
 223                                __collate_range_cmp(c, test) <= 0
 224                             && __collate_range_cmp(test, c2) <= 0
 225                            )
 226                                 ok = 1;
 227                 } else if (c == test)
 228                         ok = 1;
 229         } while ((c = *pattern++) != ']');
 230
 231         *newp = (char *)pattern;
 232         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 233 }