offsetof宏实现以及container_of《代码》

#include<stdio.h>
#include<string.h>
#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
#define container_of(ptr, type, member) ({                      \
        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
        (type *)( (char *)__mptr - offsetof(type,member) );})

#define  pppp ({ pp = 5; pp -3 ;})

struct data{
	int a;
	char b;
	char c[10];

};

#define test struct data
int main()
{
        struct data loc;
	int pp = 4;
        loc.a = 3;
	char dd[10] = "baibin";
        strcpy(loc.c,dd);
	struct data *pdata ;
        pdata = container_of(&(loc.b),struct data,b);
	printf("a=%d, c=%s",pdata->a,pdata->c);
	pp = ( {pp= 5; pp-2;});   	
	printf("\n%d\n",pp);

	return 0;
}