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

NAME
     ffs - find first bit set in a bit string

SYNOPSIS
     #include <&lt;string.h>&gt;

     int
     ffs(int value);

DESCRIPTION
     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 right-
     most bit.  A return value of 0 means that the argument was zero.

SEE ALSO
     bitstring(3)

HISTORY
     The ffs() function appeared in 4.3BSD.

4.4BSD                          April 19, 1994                               1