申请堆空间时出现的错误

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct foo{
	int a;	//4
	char b[6];	//8
	char *p;	//4
	char c[0];
};

#define EXPAND_MEM	15

int main()
{
	printf("size =%un",sizeof(struct foo));
	
	struct foo *pf = (struct foo*)malloc(sizeof(struct foo)+EXPAND_MEM*sizeof(int));

<span style="white-space:pre">	</span>/* 之前代码

<span style="white-space:pre">	</span>*<span style="white-space:pre">	</span><span style="font-family: Arial, Helvetica, sans-serif;">struct foo *pf = (struct foo*)malloc(sizeof(struct foo)+EXPAND_MEM);//这样后面赋值的时候就会越界</span><span style="font-family: Arial, Helvetica, sans-serif;">	</span>

<span style="white-space:pre">	</span>*/
	if(!pf){
		printf("there is not enough memory!n");
		exit(EXIT_FAILURE);
	}
	strcpy(pf->b,"hello");
	printf("pf->b :%s,pf :%pn",pf->b,pf);
	
	int i;
	for(i=0;i<EXPAND_MEM;i++){
		*(pf->c +i)=i;
	}
	#if 1
	printf("pf->b :%s,pf :%pn",pf->b,pf);
	printf("pf->c=[");
	for(i=0;i<EXPAND_MEM;i++){
		printf("%d ",*((pf->c)+i));
	}
	printf("]n");
	#endif

	pf->p = (char *)calloc(EXPAND_MEM,sizeof(char));
	if(!(pf->p)){
		printf("there is not enough memory!n");
		exit(EXIT_FAILURE);
	}
	strcpy(pf->p,"I LOVE Linux");
	printf("pf->p %sn",pf->p);

	free(pf->p);
	free(pf);
	return 0;
}

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