/* ffs -- Find the first bit set in the parameter @deftypefn Supplemental int ffs (int @var{valu}) Find the first (least significant) bit set in @var{valu}. Bits are numbered from right to left, starting with bit 1 (corresponding to the value 1). If @var{valu} is zero, zero is returned. @end deftypefn */ int ffs (valu) register int valu; { register int bit; if (valu == 0) return 0; for (bit = 1; !(valu & 1); bit++) valu >>= 1; return bit; }