FFS (3)
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
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