/* Copyright (C) 2024 Peter McGoron
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program. If not, see
 * <https://www.gnu.org/licenses/>.
*/

#include <assert.h>
#include "uns.h"

void uns_root_add(struct uns_gc *gc, struct uns_ctr *root)
{
	root->prev = NULL;
	root->next = gc->roots;

	if (gc->roots)
		gc->roots->prev = root;
	gc->roots = root;
}

void uns_root_remove(struct uns_gc *gc, struct uns_ctr *root)
{
	if (root->prev) {
		root->prev->next = root->next;
	}
	if (root->next) {
		root->next->prev = root->prev;
	}

	if (gc->roots == root) {
		assert(!root->prev);
		gc->roots = root->next;
	}

	root->prev = root->next = NULL;
}