read_viminfo_sub_string(vir_T *virp, int force)
{
    if (force || get_old_sub() == NULL)
	set_old_sub(viminfo_readstring(virp, 1, TRUE));
    return viminfo_readline(virp);
}
read_viminfo_sub_string(vir_T *virp, int force)
{
    if (force || get_old_sub() == NULL)
	set_old_sub(viminfo_readstring(virp, 1, TRUE));
    return viminfo_readline(virp);
}