ffs
NAME
ffs - find first bit set in a word
SYNOPSIS
#include <strings.h> I int ffs(int i ); #define _GNU_SOURCE
#include <string.h> I int ffsl(long int i ); I int ffsll(long long int i );
DESCRIPTION
The
R ffs ()
function returns the position of the first
(least significant) bit set in the word i.
The least significant bit is position 1 and the
most significant position is, for example, 32 or 64.
R
The functions
R ffsll ()
and
R ffsl ()
do the same but take
arguments of possibly different size.
RETURN VALUE
These functions return the position of the first bit set,
or 0 if no bits are set in
R i .
CONFORMING TO
4.3BSD, POSIX.1-2001.
NOTES
BSD systems have a prototype in
R <string.h> .
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