/*
 * list.c
 *
 *  Created on: 2023年3月24日
 *      Author: hello
 */

#include "list.h"

void list_add_head(list_t** l, list_t* entry)
{
	list_t* p = *l;
	while(p != NULL)
	{
		if(p == entry)  return;
		p = p->next;
	}
	entry->next = *l;  /* 将表头所指向的条目挂到当前条目后 */
	*l = entry;        /* 将表头指向当前条目 */
}

void list_add_tail(list_t** l, list_t* entry)
{
	while(*l != NULL)
	{
		if(*l == entry)  return;
		l = &((*l)->next);
	}
	*l = entry;
}

void list_del(list_t** l, list_t* entry)
{
	while(*l != NULL)
	{
		if(*l == entry)
		{
			*l = entry->next;
			entry->next = NULL;
			return;
		}
		l = &((*l)->next);
	}
}

void list_init(list_t** l)
{
	*l = NULL;
}