FFS
Section: Linux Programmer's Manual (3)
Updated: April 13, 1993
NAME
ffs - find first bit set in a word
SYNOPSIS
#include <string.h>
int ffs(int i);
DESCRIPTION
The ffs() function returns the position of the first bit set in
the word i. The least significant bit is position 1 and the
most significant position 32.
RETURN VALUE
The ffs() function returns the position of the first bit set,
or NULL if no bits are set.
CONFORMING TO
BSD 4.3