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



NAME
       ffs, ffsl, ffsll - 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 significant) bit set in the word i.  The least sig-
       nificant bit is position 1 and the most significant position is, for example, 32 or 64.  The functions  ffsll()
       and ffsl() do the same but take arguments of possibly different size.

RETURN VALUE
       These functions return the position of the first bit set, or 0 if no bits are set in i.

CONFORMING TO
       4.3BSD, POSIX.1-2001.

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

SEE ALSO
       memchr(3), feature_test_macros(7)

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2009-04-21                            FFS(3)