C语言单链表的应用

最近在看一些开源项目，大佬的思路还是很值得去学习，今天就简单介绍一下单链表的应用，配合回调函数可以玩出新花样，废话不多说直接看代码！

| 头文件

#include "stdio.h"
#include "stdint.h"


typedef struct sensor
{
    uint8_t flag;
    void (*callback)(void);
    struct sensor* next;
}sensor_t;


extern sensor_t sensor1;
extern sensor_t sensor2;
extern sensor_t sensor3;


void sensor1_callback(void);
void sensor2_callback(void);
void sensor3_callback(void);


void sensor_init(sensor_t* handle, void(*callback)(void));
void sensor_start(sensor_t* handle);
void sensor_handle(void);

| 源码

// 链表头指针
static sensor_t* head_handle = NULL;


// 创建对象
sensor_t sensor1;
sensor_t sensor2;
sensor_t sensor3;


// 回调函数
void sensor1_callback(void)
{
    printf("sensor1!
");
}


void sensor2_callback(void)
{
    printf("sensor2!
");
}


void sensor3_callback(void)
{
    printf("sensor3!
");
}


// 传感器初始化
void sensor_init(sensor_t* handle, void(*callback)(void))
{
  handle->callback = callback;
  handle->flag = 0x00;
  sensor_start(handle);
}


// 传感器开始(往链表添加节点)
void sensor_start(sensor_t* handle)
{
  sensor_t* target = head_handle;
  if(head_handle == NULL)
  {
    /* 链表为空 */
    head_handle = handle;
    handle->next = NULL;
  }
  else
  {
    /* 链表中存在节点，遍历找最后一个节点 */
    while(target->next != NULL)
    {
      /* 去掉重复节点 */
      if(target == handle){
        break;
      }
      target = target->next;
    }
    target->next = handle;
    handle->next = NULL;
  }
}


// 传感器处理(遍历链表)
void sensor_handle(void)
{
  sensor_t* target = head_handle;
  while(target != NULL)
  {
    target->callback();
    target = target->next;
  }
}

| 运用

int main()
{
    sensor_init(&sensor1,sensor1_callback);
    sensor_init(&sensor2,sensor2_callback);
    sensor_init(&sensor3,sensor3_callback);
    sensor_handle();
    while (1)
    {
        /* code */
    }
}

这个写法是理论上只会受限于内存大小，理想状态下可以无限创建对象，通过绑定回调函数，能在一定程度上解决调用耦合的问题！

　　审核编辑：汤梓红