#ifndef LISTS_H
#define LISTS_H

typedef struct LIST_T {
	struct NODE_T *first;
} list_t;

typedef struct NODE_T {
	struct NODE_T *prev;
	struct NODE_T *next;
} node_t;

int insert_node (node_t *node, node_t *pred);
int add_node (node_t *node, list_t *list);
int remove_node (node_t *node);

#endif