git.gag.com Git - debian/sudo/blob - fnmatch.c

   1 /*
   2  * Copyright (c) 2008, 2010 Todd C. Miller <Todd.Miller@courtesan.com>
   3  * Copyright (c) 1989, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Guido van Rossum.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  36  * Compares a filename or pathname to a pattern.
  37  */
  38
  39 #include <config.h>
  40
  41 #include <sys/types.h>
  42
  43 #include <stdio.h>
  44 #include <ctype.h>
  45 #ifdef HAVE_STRING_H
  46 # include <string.h>
  47 #endif /* HAVE_STRING_H */
  48 #ifdef HAVE_STRINGS_H
  49 # include <strings.h>
  50 #endif /* HAVE_STRINGS_H */
  51
  52 #include "missing.h"
  53 #include "emul/fnmatch.h"
  54 #include "emul/charclass.h"
  55
  56 #undef  EOS
  57 #define EOS     '\0'
  58
  59 #define RANGE_MATCH     1
  60 #define RANGE_NOMATCH   0
  61 #define RANGE_ERROR     (-1)
  62
  63 #if defined(LIBC_SCCS) && !defined(lint)
  64 __unused static const char rcsid[] = "$OpenBSD: fnmatch.c,v 1.6 1998/03/19 00:29:59 millert Exp $";
  65 #endif /* LIBC_SCCS and not lint */
  66
  67 static int rangematch __P((const char *, int, int, char **));
  68 static int classmatch __P((const char *, int, int, const char **));
  69
  70 int
  71 fnmatch(pattern, string, flags)
  72         const char *pattern, *string;
  73         int flags;
  74 {
  75         const char *stringstart;
  76         char *newp;
  77         char c, test;
  78
  79         for (stringstart = string;;)
  80                 switch (c = *pattern++) {
  81                 case EOS:
  82                         if (ISSET(flags, FNM_LEADING_DIR) && *string == '/')
  83                                 return 0;
  84                         return *string == EOS ? 0 : FNM_NOMATCH;
  85                 case '?':
  86                         if (*string == EOS)
  87                                 return FNM_NOMATCH;
  88                         if (*string == '/' && ISSET(flags, FNM_PATHNAME))
  89                                 return FNM_NOMATCH;
  90                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
  91                             (string == stringstart ||
  92                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
  93                                 return FNM_NOMATCH;
  94                         ++string;
  95                         break;
  96                 case '*':
  97                         c = *pattern;
  98                         /* Collapse multiple stars. */
  99                         while (c == '*')
 100                                 c = *++pattern;
 101
 102                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
 103                             (string == stringstart ||
 104                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
 105                                 return FNM_NOMATCH;
 106
 107                         /* Optimize for pattern with * at end or before /. */
 108                         if (c == EOS) {
 109                                 if (ISSET(flags, FNM_PATHNAME))
 110                                         return ISSET(flags, FNM_LEADING_DIR) ||
 111                                             strchr(string, '/') == NULL ?
 112                                             0 : FNM_NOMATCH;
 113                                 else
 114                                         return 0;
 115                         } else if (c == '/' && ISSET(flags, FNM_PATHNAME)) {
 116                                 if ((string = strchr(string, '/')) == NULL)
 117                                         return FNM_NOMATCH;
 118                                 break;
 119                         }
 120
 121                         /* General case, use recursion. */
 122                         while ((test = *string) != EOS) {
 123                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 124                                         return 0;
 125                                 if (test == '/' && ISSET(flags, FNM_PATHNAME))
 126                                         break;
 127                                 ++string;
 128                         }
 129                         return FNM_NOMATCH;
 130                 case '[':
 131                         if (*string == EOS)
 132                                 return FNM_NOMATCH;
 133                         if (*string == '/' && ISSET(flags, FNM_PATHNAME))
 134                                 return FNM_NOMATCH;
 135                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
 136                             (string == stringstart ||
 137                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
 138                                 return FNM_NOMATCH;
 139
 140                         switch (rangematch(pattern, *string, flags, &newp)) {
 141                         case RANGE_ERROR:
 142                                 /* not a good range, treat as normal text */
 143                                 goto normal;
 144                         case RANGE_MATCH:
 145                                 pattern = newp;
 146                                 break;
 147                         case RANGE_NOMATCH:
 148                                 return FNM_NOMATCH;
 149                         }
 150                         ++string;
 151                         break;
 152                 case '\\':
 153                         if (!ISSET(flags, FNM_NOESCAPE)) {
 154                                 if ((c = *pattern++) == EOS) {
 155                                         c = '\\';
 156                                         --pattern;
 157                                 }
 158                         }
 159                         /* FALLTHROUGH */
 160                 default:
 161                 normal:
 162                         if (c != *string && !(ISSET(flags, FNM_CASEFOLD) &&
 163                                  (tolower((unsigned char)c) ==
 164                                  tolower((unsigned char)*string))))
 165                                 return FNM_NOMATCH;
 166                         ++string;
 167                         break;
 168                 }
 169         /* NOTREACHED */
 170 }
 171
 172 static int
 173 #ifdef __STDC__
 174 rangematch(const char *pattern, int test, int flags, char **newp)
 175 #else
 176 rangematch(pattern, test, flags, newp)
 177         const char *pattern;
 178         int test;
 179         int flags;
 180         char **newp;
 181 #endif
 182 {
 183         int negate, ok, rv;
 184         char c, c2;
 185
 186         /*
 187          * A bracket expression starting with an unquoted circumflex
 188          * character produces unspecified results (IEEE 1003.2-1992,
 189          * 3.13.2).  This implementation treats it like '!', for
 190          * consistency with the regular expression syntax.
 191          * J.T. Conklin (conklin@ngai.kaleida.com)
 192          */
 193         if ((negate = (*pattern == '!' || *pattern == '^')))
 194                 ++pattern;
 195
 196         if (ISSET(flags, FNM_CASEFOLD))
 197                 test = tolower(test);
 198
 199         /*
 200          * A right bracket shall lose its special meaning and represent
 201          * itself in a bracket expression if it occurs first in the list.
 202          * -- POSIX.2 2.8.3.2
 203          */
 204         ok = 0;
 205         c = *pattern++;
 206         do {
 207                 if (c == '[' && *pattern == ':') {
 208                         do {
 209                                 rv = classmatch(pattern + 1, test,
 210                                     (flags & FNM_CASEFOLD), &pattern);
 211                                 if (rv == RANGE_MATCH)
 212                                         ok = 1;
 213                                 c = *pattern++;
 214                         } while (rv != RANGE_ERROR && c == '[' && *pattern == ':');
 215                         if (c == ']')
 216                         break;
 217                 }
 218                 if (c == '\\' && !ISSET(flags, FNM_NOESCAPE))
 219                         c = *pattern++;
 220                 if (c == EOS)
 221                         return RANGE_ERROR;
 222                 if (c == '/' && ISSET(flags, FNM_PATHNAME))
 223                         return RANGE_NOMATCH;
 224                 if (ISSET(flags, FNM_CASEFOLD))
 225                         c = tolower((unsigned char)c);
 226                 if (*pattern == '-'
 227                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 228                         pattern += 2;
 229                         if (c2 == '\\' && !ISSET(flags, FNM_NOESCAPE))
 230                                 c2 = *pattern++;
 231                         if (c2 == EOS)
 232                                 return RANGE_ERROR;
 233                         if (ISSET(flags, FNM_CASEFOLD))
 234                                 c2 = tolower((unsigned char)c2);
 235                         if (c <= test && test <= c2)
 236                                 ok = 1;
 237                 } else if (c == test)
 238                         ok = 1;
 239         } while ((c = *pattern++) != ']');
 240
 241         *newp = (char *)pattern;
 242         return ok == negate ? RANGE_NOMATCH : RANGE_MATCH;
 243 }
 244
 245 static int
 246 #ifdef __STDC__
 247 classmatch(const char *pattern, int test, int foldcase, const char **ep)
 248 #else
 249 classmatch(pattern, test, foldcase, ep)
 250         const char *pattern;
 251         int test;
 252         int foldcase;
 253         const char **ep;
 254 #endif
 255 {
 256         struct cclass *cc;
 257         const char *colon;
 258         size_t len;
 259         int rval = RANGE_NOMATCH;
 260
 261         if ((colon = strchr(pattern, ':')) == NULL || colon[1] != ']') {
 262                 *ep = pattern - 2;
 263                 return RANGE_ERROR;
 264         }
 265         *ep = colon + 2;
 266         len = (size_t)(colon - pattern);
 267
 268         if (foldcase && strncmp(pattern, "upper:]", 7) == 0)
 269                 pattern = "lower:]";
 270         for (cc = cclasses; cc->name != NULL; cc++) {
 271                 if (!strncmp(pattern, cc->name, len) && cc->name[len] == '\0') {
 272                         if (cc->isctype(test))
 273                                 rval = RANGE_MATCH;
 274                         break;
 275                 }
 276         }
 277         if (cc->name == NULL) {
 278                 /* invalid character class, return EOS */
 279                 *ep = colon + strlen(colon);
 280                 rval = RANGE_ERROR;
 281         }
 282         return rval;
 283 }