65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
|
/*
|
||
|
|
* ffs function
|
||
|
|
*
|
||
|
|
* Copyright 2004 Hans Leidekker
|
||
|
|
*
|
||
|
|
* This library is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This library 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
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with this library; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "config.h"
|
||
|
|
#include "wine/port.h"
|
||
|
|
|
||
|
|
#ifndef HAVE_FFS
|
||
|
|
int ffs( int x )
|
||
|
|
{
|
||
|
|
unsigned int y = (unsigned int)x;
|
||
|
|
|
||
|
|
if (y & 0x00000001) return 1;
|
||
|
|
if (y & 0x00000002) return 2;
|
||
|
|
if (y & 0x00000004) return 3;
|
||
|
|
if (y & 0x00000008) return 4;
|
||
|
|
if (y & 0x00000010) return 5;
|
||
|
|
if (y & 0x00000020) return 6;
|
||
|
|
if (y & 0x00000040) return 7;
|
||
|
|
if (y & 0x00000080) return 8;
|
||
|
|
if (y & 0x00000100) return 9;
|
||
|
|
if (y & 0x00000200) return 10;
|
||
|
|
if (y & 0x00000400) return 11;
|
||
|
|
if (y & 0x00000800) return 12;
|
||
|
|
if (y & 0x00001000) return 13;
|
||
|
|
if (y & 0x00002000) return 14;
|
||
|
|
if (y & 0x00004000) return 15;
|
||
|
|
if (y & 0x00008000) return 16;
|
||
|
|
if (y & 0x00010000) return 17;
|
||
|
|
if (y & 0x00020000) return 18;
|
||
|
|
if (y & 0x00040000) return 19;
|
||
|
|
if (y & 0x00080000) return 20;
|
||
|
|
if (y & 0x00100000) return 21;
|
||
|
|
if (y & 0x00200000) return 22;
|
||
|
|
if (y & 0x00400000) return 23;
|
||
|
|
if (y & 0x00800000) return 24;
|
||
|
|
if (y & 0x01000000) return 25;
|
||
|
|
if (y & 0x02000000) return 26;
|
||
|
|
if (y & 0x04000000) return 27;
|
||
|
|
if (y & 0x08000000) return 28;
|
||
|
|
if (y & 0x10000000) return 29;
|
||
|
|
if (y & 0x20000000) return 30;
|
||
|
|
if (y & 0x40000000) return 31;
|
||
|
|
if (y & 0x80000000) return 32;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif /* HAVE_FFS */
|