#include "list.h"

void list_append(struct list *list, struct list_node *node) {
	struct list_node *new_stl;

	if (list == NULL || node == NULL) { return; }

	new_stl = list->last;
	list->last = node;

	node->next = NULL;
	node->prev = new_stl;

	if (new_stl == NULL) {
		list->first = node;
	} else {
		new_stl->next = node;
	}
}

void list_prepend(struct list *list, struct list_node *node) {
	struct list_node *new_second;

	if (list == NULL || node == NULL) { return; }

	new_second = list->first;
	list->first = node;

	node->prev = NULL;
	node->next = new_second;

	if (new_second == NULL) {
		list->last = node;
	} else {
		new_second->prev = node;
	}
}