lib/other/ffs.c

   1 #include <lib.h>
   2 /*  ffs(3)
   3  *
   4  *  Author: Terrence W. Holm          Sep. 1988
   5  */
   6 _PROTOTYPE( int ffs, (int word));
   7
   8 int ffs(word)
   9 int word;
  10 {
  11   int i;
  12
  13   if (word == 0) return(0);
  14
  15   for (i = 1;; ++i, word >>= 1)
  16         if (word & 1) return(i);
  17 }