FFS(S)              Linux Programmer's Manual              FFS(S)



NAME
       ffs - find first bit set in a word

SYNOPSIS
       #include <strings.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 e.g. 32 or 64.

RETURN VALUE
       The  ffs()  function returns the position of the first bit
       set, or 0 if no bits are set in i.

CONFORMING TO
       BSD 4.3, POSIX 1003.1-2001.

NOTES
       BSD systems have a prototype in <string.h>.



GNU                         2001-12-20                     FFS(S)