ffsl

FFS(3)			  Linux Programmer’s Manual		       FFS(3)



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 signifi-
       cant) bit set in the word i.  The least significant bit is position  1
       and  the	 most  significant  position  e.g.  32 or 64.	The functions
       ffsll() and ffsl() do the same but take arguments of possibly  differ-
       ent 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>.



GNU				  2003-08-05			       FFS(3)