FFS(3)

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