Copyright (c) 1990 The Regents of the University of California.
All rights reserved.

This code is derived from software contributed to Berkeley by
Chris Torek.

%sccs.include.redist.man%

@(#)ffs.3 5.1 (Berkeley) 05/15/90

C 7 ffs - find first bit set in a bit string

#include <string.h>

int
ffs(int value);

Ffs finds the first bit set in value and returns the index of that bit. Bits are numbered starting from 1, starting at the right-most bit. A return value of 0 means that the argument was zero. bitstring(3)