77 	int	i, dir_diff, unclean;  in update()  local
110 			dir_diff = pp->new_dir - pp->dir;  in update()
115 				if (dir_diff > MAXDIR/2)  in update()
116 					dir_diff -= MAXDIR;  in update()
117 				else if (dir_diff < -(MAXDIR/2))  in update()
118 					dir_diff += MAXDIR;  in update()
120 			if (dir_diff > 2)  in update()
121 				dir_diff = 2;  in update()
122 			else if (dir_diff < -2)  in update()
123 				dir_diff = -2;  in update()
124 			pp->dir += dir_diff;  in update()