C语言-链表结构体使用

/*
构造链表的结构体
*/
#include <stdio.h>
typedef struct node{
    int val; 
    struct node *p_next; 
} node; 

typedef struct {
    node head; 
    node tail; 
} link 

//进行链表的初始化 
void link_init(link *p_link) {
    //将头指针指向尾指针 
    p_link->head.p_next = &p_link->tail; 
    //将尾指针对应的指针地址设置为0 
    p_link->tail.p_next = NULL; 
}

//进行链表的删除操作 
void link_deinit(link *p_link) {
    while (p_link->head.p_next != &p_link->tail) {
        node *p_first = p_link->head; 
        node *p_mid = p_first->p_next; 
        node *p_last = p_mid->p_next; 
        free(p_mid); 
        p_mid = NULL; 
    }
}