1: /* File name comparison routine.
    2: 
    3:    Copyright (C) 2007 Free Software Foundation, Inc.
    4: 
    5:    This program is free software; you can redistribute it and/or modify
    6:    it under the terms of the GNU General Public License as published by
    7:    the Free Software Foundation; either version 2, or (at your option)
    8:    any later version.
    9: 
   10:    This program is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   13:    GNU General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU General Public License
   16:    along with this program; if not, write to the Free Software Foundation,
   17:    Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
   18: 
   19: #ifdef HAVE_CONFIG_H
   20: #include "config.h"
   21: #endif
   22: 
   23: #ifdef HAVE_STRING_H
   24: #include <string.h>
   25: #endif
   26: 
   27: #include "filenames.h"
   28: #include "safe-ctype.h"
   29: 
   30: /*
   31: 
   32: @deftypefn Extension int filename_cmp (const char *@var{s1}, const char *@var{s2})
   33: 
   34: Return zero if the two file names @var{s1} and @var{s2} are equivalent.
   35: If not equivalent, the returned value is similar to what @code{strcmp}
   36: would return.  In other words, it returns a negative value if @var{s1}
   37: is less than @var{s2}, or a positive value if @var{s2} is greater than
   38: @var{s2}.
   39: 
   40: This function does not normalize file names.  As a result, this function
   41: will treat filenames that are spelled differently as different even in
   42: the case when the two filenames point to the same underlying file.
   43: However, it does handle the fact that on DOS-like file systems, forward
   44: and backward slashes are equal.
   45: 
   46: @end deftypefn
   47: 
   48: */
   49: 
   50: int
   51: filename_cmp (const char *s1, const char *s2)
   52: {
   53: #ifndef HAVE_DOS_BASED_FILE_SYSTEM
   54:   return strcmp(s1, s2);
   55: #else
   56:   for (;;)
   57:     {
   58:       int c1 = TOLOWER (*s1);
   59:       int c2 = TOLOWER (*s2);
   60: 
   61:       /* On DOS-based file systems, the '/' and the '\' are equivalent.  */
   62:       if (c1 == '/')
   63:         c1 = '\\';
   64:       if (c2 == '/')
   65:         c2 = '\\';
   66: 
   67:       if (c1 != c2)
   68:         return (c1 - c2);
   69: 
   70:       if (c1 == '\0')
   71:         return 0;
   72: 
   73:       s1++;
   74:       s2++;
   75:     }
   76: #endif
   77: }
   78: