dix/ffs.c

   1 /*
   2
   3 Copyright 1996, 1998 The Open Group
   4
   5 Permission to use, copy, modify, distribute, and sell this software and its
   6 documentation for any purpose is hereby granted without fee, provided that
   7 the above copyright notice appear in all copies and that both that
   8 copyright notice and this permission notice appear in supporting
   9 documentation.
  10
  11 The above copyright notice and this permission notice shall be included
  12 in all copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
  16 ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT
  17 SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABIL-
  18 ITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  20 IN THE SOFTWARE.
  21
  22 Except as contained in this notice, the name of The Open Group shall
  23 not be used in advertising or otherwise to promote the sale, use or
  24 other dealings in this Software without prior written authorization from
  25 The Open Group.
  26
  27 */
  28
  29 #ifdef HAVE_DIX_CONFIG_H
  30 #include <dix-config.h>
  31 #endif
  32
  33 #ifndef HAVE_FFS
  34
  35 #include "dix.h"
  36
  37 int
  38 ffs(int i)
  39 {
  40     int j;
  41
  42     if (i == 0)
  43         return 0;
  44     for (j = 1; (i & 1) == 0; j++)
  45         i >>= 1;
  46     return j;
  47 }
  48
  49 #endif