ffsl man page on ElementaryOS

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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);

       #include <string.h>

       int ffsl(long int i);

       int ffsll(long long int i);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       ffs():
	   Since glibc 2.12:
	       _SVID_SOURCE || _BSD_SOURCE || _POSIX_C_SOURCE >= 200809L ||
	       _XOPEN_SOURCE >= 700 ||
	   Before glibc 2.12:
	       none
       ffsl(), ffsll():
	   _GNU_SOURCE

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 is, for example, 32 or 64.  The func‐
       tions  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
       ffs(): 4.3BSD, POSIX.1-2001.

       The ffsl() and ffsll() functions are glibc extensions.

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

SEE ALSO
       memchr(3)

COLOPHON
       This  page  is  part of release 3.54 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2010-09-20				FFS(3)
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