add_ptr           366 dev/rnd.c      	u_int	add_ptr;
add_ptr           621 dev/rnd.c      	random_state.add_ptr = 0;
add_ptr           673 dev/rnd.c      		u_int i = random_state.add_ptr =
add_ptr           674 dev/rnd.c      		    (random_state.add_ptr - 1) & (POOLWORDS - 1);