sys/libkern/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  * $FreeBSD: src/sys/libkern/fnmatch.c,v 1.17 2003/06/11 05:23:04 obrien Exp $
  37  * $DragonFly: src/sys/libkern/fnmatch.c,v 1.3 2006/12/13 21:58:51 dillon Exp $
  38  */
  39
  40 /*
  41  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  42  * Compares a filename or pathname to a pattern.
  43  */
  44
  45 #include <sys/param.h>
  46 #include <sys/ctype.h>
  47 #include <sys/libkern.h>
  48
  49 #define EOS     '\0'
  50
  51 #define RANGE_MATCH     1
  52 #define RANGE_NOMATCH   0
  53 #define RANGE_ERROR     (-1)
  54
  55 #define MAXNEST         20
  56
  57 static int rangematch(const char *, char, int, char **);
  58
  59 int
  60 _kfnmatch(const char *pattern, const char *string, int flags, int nesting)
  61 {
  62         const char *stringstart;
  63         char *newp;
  64         char c, test;
  65
  66         if (nesting == MAXNEST)
  67                 return (FNM_NOMATCH);
  68
  69         for (stringstart = string;;) {
  70                 switch (c = *pattern++) {
  71                 case EOS:
  72                         if ((flags & FNM_LEADING_DIR) && *string == '/')
  73                                 return (0);
  74                         return (*string == EOS ? 0 : FNM_NOMATCH);
  75                 case '?':
  76                         if (*string == EOS)
  77                                 return (FNM_NOMATCH);
  78                         if (*string == '/' && (flags & FNM_PATHNAME))
  79                                 return (FNM_NOMATCH);
  80                         if (*string == '.' && (flags & FNM_PERIOD) &&
  81                             (string == stringstart ||
  82                             ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) {
  83                                 return (FNM_NOMATCH);
  84                         }
  85                         ++string;
  86                         break;
  87                 case '*':
  88                         c = *pattern;
  89                         /* Collapse multiple stars. */
  90                         while (c == '*')
  91                                 c = *++pattern;
  92
  93                         if (*string == '.' && (flags & FNM_PERIOD) &&
  94                             (string == stringstart ||
  95                             ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) {
  96                                 return (FNM_NOMATCH);
  97                         }
  98
  99                         /* Optimize for pattern with * at end or before /. */
 100                         if (c == EOS) {
 101                                 if (flags & FNM_PATHNAME) {
 102                                         return ((flags & FNM_LEADING_DIR) ||
 103                                             index(string, '/') == NULL ?
 104                                             0 : FNM_NOMATCH);
 105                                 } else {
 106                                         return (0);
 107                                 }
 108                         } else if (c == '/' && flags & FNM_PATHNAME) {
 109                                 if ((string = index(string, '/')) == NULL)
 110                                         return (FNM_NOMATCH);
 111                                 break;
 112                         }
 113
 114                         /* General case, use recursion. */
 115                         while ((test = *string) != EOS) {
 116                                 if (!_kfnmatch(pattern, string, flags & ~FNM_PERIOD, nesting + 1))
 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                         }
 163                         string++;
 164                         break;
 165                 }
 166         }
 167         /* NOTREACHED */
 168 }
 169
 170 static int
 171 rangematch(const char *pattern, char test, int flags, char **newp)
 172 {
 173         int negate, ok;
 174         char c, c2;
 175
 176         /*
 177          * A bracket expression starting with an unquoted circumflex
 178          * character produces unspecified results (IEEE 1003.2-1992,
 179          * 3.13.2).  This implementation treats it like '!', for
 180          * consistency with the regular expression syntax.
 181          * J.T. Conklin (conklin@ngai.kaleida.com)
 182          */
 183         if ((negate = (*pattern == '!' || *pattern == '^')) != 0)
 184                 ++pattern;
 185
 186         if (flags & FNM_CASEFOLD)
 187                 test = tolower((unsigned char)test);
 188
 189         /*
 190          * A right bracket shall lose its special meaning and represent
 191          * itself in a bracket expression if it occurs first in the list.
 192          * -- POSIX.2 2.8.3.2
 193          */
 194         ok = 0;
 195         c = *pattern++;
 196         do {
 197                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 198                         c = *pattern++;
 199                 if (c == EOS)
 200                         return (RANGE_ERROR);
 201
 202                 if (c == '/' && (flags & FNM_PATHNAME))
 203                         return (RANGE_NOMATCH);
 204
 205                 if (flags & FNM_CASEFOLD)
 206                         c = tolower((unsigned char)c);
 207
 208                 if (*pattern == '-'
 209                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 210                         pattern += 2;
 211                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 212                                 c2 = *pattern++;
 213                         if (c2 == EOS)
 214                                 return (RANGE_ERROR);
 215
 216                         if (flags & FNM_CASEFOLD)
 217                                 c2 = tolower((unsigned char)c2);
 218
 219                         if (c <= test && test <= c2)
 220                                 ok = 1;
 221                 } else if (c == test) {
 222                         ok = 1;
 223                 }
 224         } while ((c = *pattern++) != ']');
 225
 226         *newp = (char *)(uintptr_t)pattern;
 227         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 228 }
 229