Function nctab_move 

pub unsafe extern "C" fn nctab_move(
    nt: *mut nctabbed,
    t: *mut nctab,
    after: *mut nctab,
    before: *mut nctab,
) -> c_int

Move ‘t’ after ‘after’ (if not NULL) and before ‘before’ (if not NULL). If both ‘after’ and ‘before’ are NULL, the function returns -1, otherwise it returns 0.