lib/libc/gen/fnmatch.c

   1 /*      $NetBSD: fnmatch.c,v 1.20 2003/08/07 16:42:48 agc 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 #include <sys/cdefs.h>
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 #if 0
  38 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
  39 #else
  40 __RCSID("$NetBSD: fnmatch.c,v 1.20 2003/08/07 16:42:48 agc Exp $");
  41 #endif
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 /*
  45  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  46  * Compares a filename or pathname to a pattern.
  47  */
  48
  49 #include "namespace.h"
  50
  51 #include <assert.h>
  52 #include <ctype.h>
  53 #include <fnmatch.h>
  54 #include <string.h>
  55
  56 #ifdef __weak_alias
  57 __weak_alias(fnmatch,_fnmatch)
  58 #endif
  59
  60 #define EOS     '\0'
  61
  62 static const char *rangematch __P((const char *, int, int));
  63
  64 static inline int
  65 foldcase(int ch, int flags)
  66 {
  67
  68         if ((flags & FNM_CASEFOLD) != 0 && isupper(ch))
  69                 return (tolower(ch));
  70         return (ch);
  71 }
  72
  73 #define FOLDCASE(ch, flags)     foldcase((unsigned char)(ch), (flags))
  74
  75 int
  76 fnmatch(pattern, string, flags)
  77         const char *pattern, *string;
  78         int flags;
  79 {
  80         const char *stringstart;
  81         char c, test;
  82
  83         _DIAGASSERT(pattern != NULL);
  84         _DIAGASSERT(string != NULL);
  85
  86         for (stringstart = string;;)
  87                 switch (c = FOLDCASE(*pattern++, flags)) {
  88                 case EOS:
  89                         if ((flags & FNM_LEADING_DIR) && *string == '/')
  90                                 return (0);
  91                         return (*string == EOS ? 0 : FNM_NOMATCH);
  92                 case '?':
  93                         if (*string == EOS)
  94                                 return (FNM_NOMATCH);
  95                         if (*string == '/' && (flags & FNM_PATHNAME))
  96                                 return (FNM_NOMATCH);
  97                         if (*string == '.' && (flags & FNM_PERIOD) &&
  98                             (string == stringstart ||
  99                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 100                                 return (FNM_NOMATCH);
 101                         ++string;
 102                         break;
 103                 case '*':
 104                         c = FOLDCASE(*pattern, flags);
 105                         /* Collapse multiple stars. */
 106                         while (c == '*')
 107                                 c = FOLDCASE(*++pattern, flags);
 108
 109                         if (*string == '.' && (flags & FNM_PERIOD) &&
 110                             (string == stringstart ||
 111                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 112                                 return (FNM_NOMATCH);
 113
 114                         /* Optimize for pattern with * at end or before /. */
 115                         if (c == EOS) {
 116                                 if (flags & FNM_PATHNAME)
 117                                         return ((flags & FNM_LEADING_DIR) ||
 118                                             strchr(string, '/') == NULL ?
 119                                             0 : FNM_NOMATCH);
 120                                 else
 121                                         return (0);
 122                         } else if (c == '/' && flags & FNM_PATHNAME) {
 123                                 if ((string = strchr(string, '/')) == NULL)
 124                                         return (FNM_NOMATCH);
 125                                 break;
 126                         }
 127
 128                         /* General case, use recursion. */
 129                         while ((test = FOLDCASE(*string, flags)) != EOS) {
 130                                 if (!fnmatch(pattern, string,
 131                                              flags & ~FNM_PERIOD))
 132                                         return (0);
 133                                 if (test == '/' && flags & FNM_PATHNAME)
 134                                         break;
 135                                 ++string;
 136                         }
 137                         return (FNM_NOMATCH);
 138                 case '[':
 139                         if (*string == EOS)
 140                                 return (FNM_NOMATCH);
 141                         if (*string == '/' && flags & FNM_PATHNAME)
 142                                 return (FNM_NOMATCH);
 143                         if ((pattern =
 144                             rangematch(pattern, FOLDCASE(*string, flags),
 145                                        flags)) == NULL)
 146                                 return (FNM_NOMATCH);
 147                         ++string;
 148                         break;
 149                 case '\\':
 150                         if (!(flags & FNM_NOESCAPE)) {
 151                                 if ((c = FOLDCASE(*pattern++, flags)) == EOS) {
 152                                         c = '\\';
 153                                         --pattern;
 154                                 }
 155                         }
 156                         /* FALLTHROUGH */
 157                 default:
 158                         if (c != FOLDCASE(*string++, flags))
 159                                 return (FNM_NOMATCH);
 160                         break;
 161                 }
 162         /* NOTREACHED */
 163 }
 164
 165 static const char *
 166 rangematch(pattern, test, flags)
 167         const char *pattern;
 168         int test, flags;
 169 {
 170         int negate, ok;
 171         char c, c2;
 172
 173         _DIAGASSERT(pattern != NULL);
 174
 175         /*
 176          * A bracket expression starting with an unquoted circumflex
 177          * character produces unspecified results (IEEE 1003.2-1992,
 178          * 3.13.2).  This implementation treats it like '!', for
 179          * consistency with the regular expression syntax.
 180          * J.T. Conklin (conklin@ngai.kaleida.com)
 181          */
 182         if ((negate = (*pattern == '!' || *pattern == '^')) != 0)
 183                 ++pattern;
 184
 185         for (ok = 0; (c = FOLDCASE(*pattern++, flags)) != ']';) {
 186                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 187                         c = FOLDCASE(*pattern++, flags);
 188                 if (c == EOS)
 189                         return (NULL);
 190                 if (*pattern == '-'
 191                     && (c2 = FOLDCASE(*(pattern+1), flags)) != EOS &&
 192                         c2 != ']') {
 193                         pattern += 2;
 194                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 195                                 c2 = FOLDCASE(*pattern++, flags);
 196                         if (c2 == EOS)
 197                                 return (NULL);
 198                         if (c <= test && test <= c2)
 199                                 ok = 1;
 200                 } else if (c == test)
 201                         ok = 1;
 202         }
 203         return (ok == negate ? NULL : pattern);
 204 }