Function ncplane_cursor_move_yx 

pub unsafe extern "C" fn ncplane_cursor_move_yx(
    n: *mut ncplane,
    y: c_int,
    x: c_int,
) -> c_int

Move the cursor to the specified position (the cursor needn’t be visible). Pass -1 as either coordinate to hold that axis constant. Returns -1 if the move would place the cursor outside the plane.