blob: de047e217eb30502b1cd5edc20d506294716543d [file] [log] [blame]
/* 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
ffs (valu)
register int valu;
register int bit;
if (valu == 0)
return 0;
for (bit = 1; !(valu & 1); bit++)
valu >>= 1;
return bit;