NAME

       ffs - find first set bit

SYNOPSIS

       #include <strings.h>

       int ffs(int i);

DESCRIPTION

       The ffs() function shall find the first bit set (beginning with the least significant bit)
       in i, and return the index of that bit. Bits are  numbered  starting  at  one  (the  least
       significant bit).

RETURN VALUE

       The  ffs()  function  shall  return the index of the first bit set.  If i is 0, then ffs()
       shall return 0.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The Base Definitions volume of IEEE Std 1003.1-2001, <strings.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .