NAME
ffs —
find first bit set in a bit
string
SYNOPSIS
#include
<strings.h>
int
ffs(int
value);
DESCRIPTION
The
ffs()
function finds the first bit set in value and returns
the index of that bit. Bits are numbered starting from 1, starting at the
rightmost bit. A return value of 0 means that the argument was zero.
SEE ALSO
STANDARDS
The ffs() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
HISTORY
The ffs() function first appeared in
4.2BSD.