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   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 "compat/charclass.h"
  54 #include "compat/fnmatch.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(const char *, int, int, char **);
  68 static int classmatch(const char *, int, int, const char **);
  69
  70 int
  71 rpl_fnmatch(const char *pattern, const char *string, int flags)
  72 {
  73         const char *stringstart;
  74         char *newp;
  75         char c, test;
  76
  77         for (stringstart = string;;)
  78                 switch (c = *pattern++) {
  79                 case EOS:
  80                         if (ISSET(flags, FNM_LEADING_DIR) && *string == '/')
  81                                 return 0;
  82                         return *string == EOS ? 0 : FNM_NOMATCH;
  83                 case '?':
  84                         if (*string == EOS)
  85                                 return FNM_NOMATCH;
  86                         if (*string == '/' && ISSET(flags, FNM_PATHNAME))
  87                                 return FNM_NOMATCH;
  88                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
  89                             (string == stringstart ||
  90                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
  91                                 return FNM_NOMATCH;
  92                         ++string;
  93                         break;
  94                 case '*':
  95                         c = *pattern;
  96                         /* Collapse multiple stars. */
  97                         while (c == '*')
  98                                 c = *++pattern;
  99
 100                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
 101                             (string == stringstart ||
 102                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
 103                                 return FNM_NOMATCH;
 104
 105                         /* Optimize for pattern with * at end or before /. */
 106                         if (c == EOS) {
 107                                 if (ISSET(flags, FNM_PATHNAME))
 108                                         return (ISSET(flags, FNM_LEADING_DIR) ||
 109                                             strchr(string, '/') == NULL ?
 110                                             0 : FNM_NOMATCH);
 111                                 else
 112                                         return 0;
 113                         } else if (c == '/' && ISSET(flags, FNM_PATHNAME)) {
 114                                 if ((string = strchr(string, '/')) == NULL)
 115                                         return FNM_NOMATCH;
 116                                 break;
 117                         }
 118
 119                         /* General case, use recursion. */
 120                         while ((test = *string) != EOS) {
 121                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 122                                         return 0;
 123                                 if (test == '/' && ISSET(flags, FNM_PATHNAME))
 124                                         break;
 125                                 ++string;
 126                         }
 127                         return FNM_NOMATCH;
 128                 case '[':
 129                         if (*string == EOS)
 130                                 return FNM_NOMATCH;
 131                         if (*string == '/' && ISSET(flags, FNM_PATHNAME))
 132                                 return FNM_NOMATCH;
 133                         if (*string == '.' && ISSET(flags, FNM_PERIOD) &&
 134                             (string == stringstart ||
 135                             (ISSET(flags, FNM_PATHNAME) && *(string - 1) == '/')))
 136                                 return FNM_NOMATCH;
 137
 138                         switch (rangematch(pattern, *string, flags, &newp)) {
 139                         case RANGE_ERROR:
 140                                 /* not a good range, treat as normal text */
 141                                 goto normal;
 142                         case RANGE_MATCH:
 143                                 pattern = newp;
 144                                 break;
 145                         case RANGE_NOMATCH:
 146                                 return FNM_NOMATCH;
 147                         }
 148                         ++string;
 149                         break;
 150                 case '\\':
 151                         if (!ISSET(flags, FNM_NOESCAPE)) {
 152                                 if ((c = *pattern++) == EOS) {
 153                                         c = '\\';
 154                                         --pattern;
 155                                 }
 156                         }
 157                         /* FALLTHROUGH */
 158                 default:
 159                 normal:
 160                         if (c != *string && !(ISSET(flags, FNM_CASEFOLD) &&
 161                                  (tolower((unsigned char)c) ==
 162                                  tolower((unsigned char)*string))))
 163                                 return FNM_NOMATCH;
 164                         ++string;
 165                         break;
 166                 }
 167         /* NOTREACHED */
 168 }
 169
 170 static int
 171 rangematch(const char *pattern, int test, int flags, char **newp)
 172 {
 173         int negate, ok, rv;
 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 == '^')))
 184                 ++pattern;
 185
 186         if (ISSET(flags, FNM_CASEFOLD))
 187                 test = tolower(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 == '[' && *pattern == ':') {
 198                         do {
 199                                 rv = classmatch(pattern + 1, test,
 200                                     (flags & FNM_CASEFOLD), &pattern);
 201                                 if (rv == RANGE_MATCH)
 202                                         ok = 1;
 203                                 c = *pattern++;
 204                         } while (rv != RANGE_ERROR && c == '[' && *pattern == ':');
 205                         if (c == ']')
 206                         break;
 207                 }
 208                 if (c == '\\' && !ISSET(flags, FNM_NOESCAPE))
 209                         c = *pattern++;
 210                 if (c == EOS)
 211                         return RANGE_ERROR;
 212                 if (c == '/' && ISSET(flags, FNM_PATHNAME))
 213                         return RANGE_NOMATCH;
 214                 if (ISSET(flags, FNM_CASEFOLD))
 215                         c = tolower((unsigned char)c);
 216                 if (*pattern == '-'
 217                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 218                         pattern += 2;
 219                         if (c2 == '\\' && !ISSET(flags, FNM_NOESCAPE))
 220                                 c2 = *pattern++;
 221                         if (c2 == EOS)
 222                                 return RANGE_ERROR;
 223                         if (ISSET(flags, FNM_CASEFOLD))
 224                                 c2 = tolower((unsigned char)c2);
 225                         if (c <= test && test <= c2)
 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 }
 234
 235 static int
 236 classmatch(const char *pattern, int test, int foldcase, const char **ep)
 237 {
 238         struct cclass *cc;
 239         const char *colon;
 240         size_t len;
 241         int rval = RANGE_NOMATCH;
 242
 243         if ((colon = strchr(pattern, ':')) == NULL || colon[1] != ']') {
 244                 *ep = pattern - 2;
 245                 return RANGE_ERROR;
 246         }
 247         *ep = colon + 2;
 248         len = (size_t)(colon - pattern);
 249
 250         if (foldcase && strncmp(pattern, "upper:]", 7) == 0)
 251                 pattern = "lower:]";
 252         for (cc = cclasses; cc->name != NULL; cc++) {
 253                 if (!strncmp(pattern, cc->name, len) && cc->name[len] == '\0') {
 254                         if (cc->isctype(test))
 255                                 rval = RANGE_MATCH;
 256                         break;
 257                 }
 258         }
 259         if (cc->name == NULL) {
 260                 /* invalid character class, return EOS */
 261                 *ep = colon + strlen(colon);
 262                 rval = RANGE_ERROR;
 263         }
 264         return rval;
 265 }