已知结构体成员地址，算出该结构体首地址

@2018-09-28

code

 1 #include <stdio.h> 
 2 
 3 
 4 #define rt_container_of(ptr, type, member)    \
 5     ((type *)((char *)(ptr) - (unsigned long)(&((type *)0)->member)))
 6 
 7 
 8 struct _structure
 9 {
10     char a;
11     short b;
12     int c;
13     float d;
14     double e;    
15 };
16 
17 
18 int main(void)
19 {
20     struct _structure obj;
21         
22     printf("%#X:\t%#X\t%#X\t%#X\t%#X\t%#X\t\n", &obj, &obj.a, &obj.b, &obj.c, &obj.d, &obj.e);
23     
24     
25     printf("%#X\t%#X\t%#X\n", (char *)(&obj.c), &((struct _structure *)0)->c, rt_container_of(&obj.c, struct _structure, c));
26 }

 

posted @ 2018-09-28 12:06  壹点灵异  阅读(542)  评论(0)  编辑  收藏  举报