4.4BSD/usr/share/man/cat3/ffs.0

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

NNAAMMEE
     ffffss - find first bit set in a bit string

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssttrriinngg..hh>>

     _i_n_t
     ffffss(_i_n_t _v_a_l_u_e);

DDEESSCCRRIIPPTTIIOONN
     The ffffss() fucntion finds the first bit set in _v_a_l_u_e 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.

SSEEEE AALLSSOO
     bitstring(3)

HHIISSTTOORRYY
     The ffffss() function appeared in 4.3BSD.

4.4BSD                           June 4, 1993                                1