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ffs(3) -- Linux man page
NAME
ffs - find first bit set in a word
SYNOPSIS
#include <strings.h>
int ffs(int i);
#define _GNU_SOURCE
#include <string.h>
int ffsl(long int i);
int ffsll(long long int i);
DESCRIPTION
The 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 e.g. 32 or 64.
Thefunctionsffsll()andffsl()dothesamebuttake
arguments of possibly different size.
RETURN VALUE
These functions return the position of the first bit set,
or 0 if no bits are set.
CONFORMING TO
BSD 4.3, POSIX 1003.1-2001.
NOTES
BSD systems have a prototype in
<string.h>.
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