compat.c revision 7e7bd3dccbfe8f79e25e5c1554b5bc3a9aaca321
/**
* compat.c - Tweaks for Windows compatibility
*
* Copyright (c) 2002 Richard Russon
* Copyright (c) 2002-2004 Anton Altaparmakov
*
* This program/include file 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 of the License, or
* (at your option) any later version.
*
* This program/include file 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 (in the main directory of the Linux-NTFS
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef WINDOWS
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "compat.h"
/* TODO: Add check for FFS in the configure script... (AIA) */
#ifndef HAVE_FFS
/**
* ffs - Find the first set bit in an int
* @x:
*
* Description...
*
* Returns:
*/
int ffs(int x)
{
int r = 1;
if (!x)
return 0;
if (!(x & 0xffff)) {
x >>= 16;
r += 16;
}
if (!(x & 0xff)) {
x >>= 8;
r += 8;
}
if (!(x & 0xf)) {
x >>= 4;
r += 4;
}
if (!(x & 3)) {
x >>= 2;
r += 2;
}
if (!(x & 1)) {
x >>= 1;
r += 1;
}
return r;
}
#endif /* HAVE_FFS */
#endif /* WINDOWS */