lib/libc/posix/fnmatch.c

   1 /*      $OpenBSD: fnmatch.c,v 1.14 2008/10/01 23:04:13 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. 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 /*
  36  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  37  * Compares a filename or pathname to a pattern.
  38  */
  39
  40 #include <ctype.h>
  41 #include <stdio.h>
  42 #include <string.h>
  43 #include <fnmatch.h>
  44
  45 #include "charclass.h"
  46
  47 #define EOS     '\0'
  48
  49 #define RANGE_MATCH     1
  50 #define RANGE_NOMATCH   0
  51 #define RANGE_ERROR     (-1)
  52
  53 static int rangematch(const char *, char, int, char **);
  54 static int classmatch(const char *, char, int, const char **);
  55
  56 int
  57 fnmatch(const char *pattern, const char *string, int flags)
  58 {
  59         const char *stringstart;
  60         char *newp;
  61         char c, test;
  62
  63         for (stringstart = string;;)
  64                 switch (c = *pattern++) {
  65                 case EOS:
  66                         if ((flags & FNM_LEADING_DIR) && *string == '/')
  67                                 return (0);
  68                         return (*string == EOS ? 0 : FNM_NOMATCH);
  69                 case '?':
  70                         if (*string == EOS)
  71                                 return (FNM_NOMATCH);
  72                         if (*string == '/' && (flags & FNM_PATHNAME))
  73                                 return (FNM_NOMATCH);
  74                         if (*string == '.' && (flags & FNM_PERIOD) &&
  75                             (string == stringstart ||
  76                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  77                                 return (FNM_NOMATCH);
  78                         ++string;
  79                         break;
  80                 case '*':
  81                         c = *pattern;
  82                         /* Collapse multiple stars. */
  83                         while (c == '*')
  84                                 c = *++pattern;
  85
  86                         if (*string == '.' && (flags & FNM_PERIOD) &&
  87                             (string == stringstart ||
  88                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  89                                 return (FNM_NOMATCH);
  90
  91                         /* Optimize for pattern with * at end or before /. */
  92                         if (c == EOS) {
  93                                 if (flags & FNM_PATHNAME)
  94                                         return ((flags & FNM_LEADING_DIR) ||
  95                                             strchr(string, '/') == NULL ?
  96                                             0 : FNM_NOMATCH);
  97                                 else
  98                                         return (0);
  99                         } else if (c == '/' && (flags & FNM_PATHNAME)) {
 100                                 if ((string = strchr(string, '/')) == NULL)
 101                                         return (FNM_NOMATCH);
 102                                 break;
 103                         }
 104
 105                         /* General case, use recursion. */
 106                         while ((test = *string) != EOS) {
 107                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 108                                         return (0);
 109                                 if (test == '/' && (flags & FNM_PATHNAME))
 110                                         break;
 111                                 ++string;
 112                         }
 113                         return (FNM_NOMATCH);
 114                 case '[':
 115                         if (*string == EOS)
 116                                 return (FNM_NOMATCH);
 117                         if (*string == '/' && (flags & FNM_PATHNAME))
 118                                 return (FNM_NOMATCH);
 119                         if (*string == '.' && (flags & FNM_PERIOD) &&
 120                             (string == stringstart ||
 121                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 122                                 return (FNM_NOMATCH);
 123
 124                         switch (rangematch(pattern, *string, flags, &newp)) {
 125                         case RANGE_ERROR:
 126                                 /* not a good range, treat as normal text */
 127                                 goto normal;
 128                         case RANGE_MATCH:
 129                                 pattern = newp;
 130                                 break;
 131                         case RANGE_NOMATCH:
 132                                 return (FNM_NOMATCH);
 133                         }
 134                         ++string;
 135                         break;
 136                 case '\\':
 137                         if (!(flags & FNM_NOESCAPE)) {
 138                                 if ((c = *pattern++) == EOS) {
 139                                         c = '\\';
 140                                         --pattern;
 141                                 }
 142                         }
 143                         /* FALLTHROUGH */
 144                 default:
 145                 normal:
 146                         if (c != *string && !((flags & FNM_CASEFOLD) &&
 147                                  (tolower((unsigned char)c) ==
 148                                  tolower((unsigned char)*string))))
 149                                 return (FNM_NOMATCH);
 150                         ++string;
 151                         break;
 152                 }
 153         /* NOTREACHED */
 154 }
 155
 156 static int
 157 rangematch(const char *pattern, char test, int flags, char **newp)
 158 {
 159         int negate, ok, rv;
 160         char c, c2;
 161
 162         /*
 163          * A bracket expression starting with an unquoted circumflex
 164          * character produces unspecified results (IEEE 1003.2-1992,
 165          * 3.13.2).  This implementation treats it like '!', for
 166          * consistency with the regular expression syntax.
 167          * J.T. Conklin (conklin@ngai.kaleida.com)
 168          */
 169         if ((negate = (*pattern == '!' || *pattern == '^')))
 170                 ++pattern;
 171
 172         if (flags & FNM_CASEFOLD)
 173                 test = (char)tolower((unsigned char)test);
 174
 175         /*
 176          * A right bracket shall lose its special meaning and represent
 177          * itself in a bracket expression if it occurs first in the list.
 178          * -- POSIX.2 2.8.3.2
 179          */
 180         ok = 0;
 181         c = *pattern++;
 182         do {
 183                 if (c == '[' && *pattern == ':') {
 184                         do {
 185                                 rv = classmatch(pattern + 1, test,
 186                                     (flags & FNM_CASEFOLD), &pattern);
 187                                 if (rv == RANGE_MATCH)
 188                                         ok = 1;
 189                                 c = *pattern++;
 190                         } while (rv != RANGE_ERROR && c == '[' && *pattern == ':');
 191                         if (c == ']')
 192                                 break;
 193                 }
 194                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 195                         c = *pattern++;
 196                 if (c == EOS)
 197                         return (RANGE_ERROR);
 198                 if (c == '/' && (flags & FNM_PATHNAME))
 199                         return (RANGE_NOMATCH);
 200                 if ((flags & FNM_CASEFOLD))
 201                         c = (char)tolower((unsigned char)c);
 202                 if (*pattern == '-'
 203                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 204                         pattern += 2;
 205                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 206                                 c2 = *pattern++;
 207                         if (c2 == EOS)
 208                                 return (RANGE_ERROR);
 209                         if (flags & FNM_CASEFOLD)
 210                                 c2 = (char)tolower((unsigned char)c2);
 211                         if (c <= test && test <= c2)
 212                                 ok = 1;
 213                 } else if (c == test)
 214                         ok = 1;
 215         } while ((c = *pattern++) != ']');
 216
 217         *newp = (char *)pattern;
 218         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 219 }
 220
 221 static int
 222 classmatch(const char *pattern, char test, int foldcase, const char **ep)
 223 {
 224         struct cclass *cc;
 225         const char *colon;
 226         size_t len;
 227         int rval = RANGE_NOMATCH;
 228
 229         if ((colon = strchr(pattern, ':')) == NULL || colon[1] != ']') {
 230                 *ep = pattern - 2;
 231                 return(RANGE_ERROR);
 232         }
 233         *ep = colon + 2;
 234         len = (size_t)(colon - pattern);
 235
 236         if (foldcase && strncmp(pattern, "upper:]", 7) == 0)
 237                 pattern = "lower:]";
 238         for (cc = cclasses; cc->name != NULL; cc++) {
 239                 if (!strncmp(pattern, cc->name, len) && cc->name[len] == '\0') {
 240                         if (cc->isctype((unsigned char)test))
 241                                 rval = RANGE_MATCH;
 242                         break;
 243                 }
 244         }
 245         if (cc->name == NULL) {
 246                 /* invalid character class, return EOS */
 247                 *ep = colon + strlen(colon);
 248                 rval = RANGE_ERROR;
 249         }
 250         return(rval);
 251 }