compat/fnmatch.c

   1 /*      $OpenBSD: fnmatch.c,v 1.6 1998/03/19 00:29:59 millert 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[] = "$OpenBSD: fnmatch.c,v 1.6 1998/03/19 00:29:59 millert 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 <config.h>
  53
  54 #include <stdio.h>
  55
  56 #ifdef STDC_HEADERS
  57 # include <string.h>
  58 #endif
  59
  60 #ifdef HAVE_CTYPE_H
  61 # include <ctype.h>
  62 #endif
  63
  64 #include <compat.h>
  65
  66
  67 #define EOS     '\0'
  68
  69 #define RANGE_MATCH     1
  70 #define RANGE_NOMATCH   0
  71 #define RANGE_ERROR     (-1)
  72
  73 #ifdef NO_IBM_COMPILER_HORKAGE
  74 static int rangematch (const char *, char, int, char **);
  75 #else
  76 static int rangematch ();
  77 #endif
  78
  79 int
  80 fnmatch(pattern, string, flags)
  81         const char *pattern, *string;
  82         int flags;
  83 {
  84         const char *stringstart;
  85         char *newp;
  86         char c, test;
  87
  88         for (stringstart = string;;)
  89                 switch (c = *pattern++) {
  90                 case EOS:
  91                         if ((flags & FNM_LEADING_DIR) && *string == '/')
  92                                 return (0);
  93                         return (*string == EOS ? 0 : FNM_NOMATCH);
  94                 case '?':
  95                         if (*string == EOS)
  96                                 return (FNM_NOMATCH);
  97                         if (*string == '/' && (flags & FNM_PATHNAME))
  98                                 return (FNM_NOMATCH);
  99                         if (*string == '.' && (flags & FNM_PERIOD) &&
 100                             (string == stringstart ||
 101                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 102                                 return (FNM_NOMATCH);
 103                         ++string;
 104                         break;
 105                 case '*':
 106                         c = *pattern;
 107                         /* Collapse multiple stars. */
 108                         while (c == '*')
 109                                 c = *++pattern;
 110
 111                         if (*string == '.' && (flags & FNM_PERIOD) &&
 112                             (string == stringstart ||
 113                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 114                                 return (FNM_NOMATCH);
 115
 116                         /* Optimize for pattern with * at end or before /. */
 117                         if (c == EOS) {
 118                                 if (flags & FNM_PATHNAME)
 119                                         return ((flags & FNM_LEADING_DIR) ||
 120                                             strchr(string, '/') == NULL ?
 121                                             0 : FNM_NOMATCH);
 122                                 else
 123                                         return (0);
 124                         } else if (c == '/' && (flags & FNM_PATHNAME)) {
 125                                 if ((string = strchr(string, '/')) == NULL)
 126                                         return (FNM_NOMATCH);
 127                                 break;
 128                         }
 129
 130                         /* General case, use recursion. */
 131                         while ((test = *string) != EOS) {
 132                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 133                                         return (0);
 134                                 if (test == '/' && (flags & FNM_PATHNAME))
 135                                         break;
 136                                 ++string;
 137                         }
 138                         return (FNM_NOMATCH);
 139                 case '[':
 140                         if (*string == EOS)
 141                                 return (FNM_NOMATCH);
 142                         if (*string == '/' && (flags & FNM_PATHNAME))
 143                                 return (FNM_NOMATCH);
 144                         if (*string == '.' && (flags & FNM_PERIOD) &&
 145                             (string == stringstart ||
 146                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 147                                 return (FNM_NOMATCH);
 148
 149                         switch (rangematch(pattern, *string, flags, &newp)) {
 150                         case RANGE_ERROR:
 151                                 /* not a good range, treat as normal text */
 152                                 goto normal;
 153                         case RANGE_MATCH:
 154                                 pattern = newp;
 155                                 break;
 156                         case RANGE_NOMATCH:
 157                                 return (FNM_NOMATCH);
 158                         }
 159                         ++string;
 160                         break;
 161                 case '\\':
 162                         if (!(flags & FNM_NOESCAPE)) {
 163                                 if ((c = *pattern++) == EOS) {
 164                                         c = '\\';
 165                                         --pattern;
 166                                 }
 167                         }
 168                         /* FALLTHROUGH */
 169                 default:
 170                 normal:
 171                         if (c != *string && !((flags & FNM_CASEFOLD) &&
 172                                  (tolower((unsigned char)c) ==
 173                                  tolower((unsigned char)*string))))
 174                                 return (FNM_NOMATCH);
 175                         ++string;
 176                         break;
 177                 }
 178         /* NOTREACHED */
 179 }
 180
 181 static int
 182 rangematch(pattern, test, flags, newp)
 183         const char *pattern;
 184         char test;
 185         int flags;
 186         char **newp;
 187 {
 188         int negate, ok;
 189         char c, c2;
 190
 191         /*
 192          * A bracket expression starting with an unquoted circumflex
 193          * character produces unspecified results (IEEE 1003.2-1992,
 194          * 3.13.2).  This implementation treats it like '!', for
 195          * consistency with the regular expression syntax.
 196          * J.T. Conklin (conklin@ngai.kaleida.com)
 197          */
 198         if ((negate = (*pattern == '!' || *pattern == '^')))
 199                 ++pattern;
 200
 201         if (flags & FNM_CASEFOLD)
 202                 test = tolower((unsigned char)test);
 203
 204         /*
 205          * A right bracket shall lose its special meaning and represent
 206          * itself in a bracket expression if it occurs first in the list.
 207          * -- POSIX.2 2.8.3.2
 208          */
 209         ok = 0;
 210         c = *pattern++;
 211         do {
 212                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 213                         c = *pattern++;
 214                 if (c == EOS)
 215                         return (RANGE_ERROR);
 216                 if (c == '/' && (flags & FNM_PATHNAME))
 217                         return (RANGE_NOMATCH);
 218                 if ((flags & FNM_CASEFOLD))
 219                         c = tolower((unsigned char)c);
 220                 if (*pattern == '-'
 221                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 222                         pattern += 2;
 223                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 224                                 c2 = *pattern++;
 225                         if (c2 == EOS)
 226                                 return (RANGE_ERROR);
 227                         if (flags & FNM_CASEFOLD)
 228                                 c2 = tolower((unsigned char)c2);
 229                         if (c <= test && test <= c2)
 230                                 ok = 1;
 231                 } else if (c == test)
 232                         ok = 1;
 233         } while ((c = *pattern++) != ']');
 234
 235         *newp = (char *)pattern;
 236         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 237 }