NAME    [Toc]    [Back]

     ffs -- find first bit set in a bit string

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <strings.h>

     int
     ffs(int value);

DESCRIPTION    [Toc]    [Back]

     The ffs() function finds the first bit set in value and returns the index
     of that bit.  Bits are numbered starting from 1, starting at the rightmost
 bit.	A return value of 0 means that the argument was zero.

SEE ALSO    [Toc]    [Back]

     bitstring(3)

HISTORY    [Toc]    [Back]

     The ffs() function appeared in 4.3BSD.  Its prototype existed previously
     in <string.h> before it was moved to <strings.h> for IEEE Std 1003.1-2001
     (``POSIX.1'') compliance.


FreeBSD 5.2.1			April 19, 1994			 FreeBSD 5.2.1