libiberty/ffs.c

   1 /* ffs -- Find the first bit set in the parameter
   2
   3 NAME
   4         ffs -- Find the first bit set in the parameter
   5
   6 SYNOPSIS
   7         int ffs (int valu)
   8
   9 DESCRIPTION
  10         Find the first bit set in the parameter. Bits are numbered from
  11         right to left, starting with bit 1.
  12
  13 */
  14
  15 int
  16 ffs (valu)
  17   register int valu;
  18 {
  19   register int bit;
  20
  21   if (valu == 0)
  22     return 0;
  23
  24   for (bit = 1; !(valu & 1); bit++)
  25         valu >>= 1;
  26
  27   return bit;
  28 }
  29