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+/* File name comparison routine.
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#include <ctype.h>
+#include "filenames.h"
+
+/*
+
+@deftypefn Extension int filename_cmp (const char *@var{s1}, const char *@var{s2})
+
+Return zero if the two paths @var{s1} and @var{s2} are equivalent.
+If not equivalent, the returned value is similar to what strcmp would
+return. In other words, it returns a negative value if @var{s1} is less
+than @var{s2}, or a positive value if @var{s2} is greater than @var{s2}.
+
+This function does not normalize path names. As a result, this function
+will treat filenames that are spelled differently as different even in
+the case when the two filenames point to the same underlying file.
+However, it does handle the fact that on DOS-like file systems, forward
+and backward slashes are equal.
+
+@end deftypefn
+
+*/
+
+int
+filename_cmp (const char *s1, const char *s2)
+{
+#ifndef HAVE_DOS_BASED_FILE_SYSTEM
+ return strcmp(s1, s2);
+#else
+ for (;;)
+ {
+ int c1 = tolower (*s1);
+ int c2 = tolower (*s2);
+
+ /* On DOS-based file systems, the '/' and the '\' are equivalent. */
+ if (c1 == '/')
+ c1 = '\\';
+ if (c2 == '/')
+ c2 = '\\';
+
+ if (c1 != c2)
+ return (c1 - c2);
+
+ if (c1 == '\0')
+ return 0;
+
+ s1++;
+ s2++;
+ }
+#endif
+}
+