ff_pop(ff_search_ctx_T *search_ctx)
{
    ff_stack_T  *sptr;

    sptr = search_ctx->ffsc_stack_ptr;
    if (search_ctx->ffsc_stack_ptr != NULL)
	search_ctx->ffsc_stack_ptr = search_ctx->ffsc_stack_ptr->ffs_prev;

    return sptr;
}
ff_pop(ff_search_ctx_T *search_ctx)
{
    ff_stack_T  *sptr;

    sptr = search_ctx->ffsc_stack_ptr;
    if (search_ctx->ffsc_stack_ptr != NULL)
	search_ctx->ffsc_stack_ptr = search_ctx->ffsc_stack_ptr->ffs_prev;

    return sptr;
}