代码

// #5630

#include <string.h>

#define size 8

typedef struct{ char buffer[size]; } Block;

void my_memset(char *a, char c, unsigned n)
{
	char *p = (char *)((int)(a + size - 1) & ~(size - 1));
	memset(a, c, p - a);
	a += n;
	memset((char *)((int)(a) & ~(size - 1)), c, (int)(a) & (size - 1));
	a = (char *)((int)(a) & ~(size - 1));
	Block b;
	memset(&b, c, size);
	for (; p != a; p += size)
		*(Block *)(p) = b;
}

评测结果