/*
 * list.c
 *
 *  Created on: Jul 27, 2016
 *      Author: tkl
 */

#include "stddef.h"
#include "list.h"

int list_init(struct list *head)
{
	if(NULL == head)
		return -1;

	head->front = NULL;
	head->rear = NULL;

	return 0;
}

int list_add(struct list *head, struct list_node *node)
{
	if((NULL == head) || (NULL == node))
		return -1;

	if(head->front == NULL) {
		head->front = node;
		head->rear = node;
	}
	else {
		head->rear->next = node;
		head->rear = node;
	}
	return 1;
}

int list_get_len(struct list *head)
{
	int ret = 0;
	if(NULL == head)
		return -1;
	struct list_node *it = head->front;
	while(NULL != it) {
		ret++;
		it = it->next;
	}
	return ret;
}