sscanf 导致栈溢出的问题

Question

#include <stdio.h>

void test()
{	
	
	unsigned short buf[6] = {0};
	
	for(int i=0;i <6;i++)
		printf("before sscanf buf[%d] = %d\n", i, buf[i]);

	sscanf("2021-06-07 17:55:05", "%d-%d-%d %d:%d:%d", &buf[0], &buf[1],&buf[2], &buf[3], &buf[4], &buf[5]);

	for(int i=0 ;i<6; i++)
		printf("after sscanf buf[%d] = %d\n", i, buf[i]);
}

int main()
{
	test();
   	return 0;
}

运行结果

root@ubuntu:~/Desktop/test# ./testCode 
before sscanf buf[0] = 0
before sscanf buf[1] = 0
before sscanf buf[2] = 0
before sscanf buf[3] = 0
before sscanf buf[4] = 0
before sscanf buf[5] = 0
after sscanf buf[0] = 2021
after sscanf buf[1] = 6
after sscanf buf[2] = 7
after sscanf buf[3] = 17
after sscanf buf[4] = 55
after sscanf buf[5] = 5
*** stack smashing detected ***: terminated
已放弃 (核心已转储)

请问为什么会导致栈溢出呢？

Answer 1

用 scanf_s