代码

#include <string.h>

typedef struct{ char buffer[16]; } Block;

void my_memset(char *a, char c, unsigned n)
{
	Block b;
	memset(&b, c, sizeof(Block));
	char *p = a;
	a += n;
	for (; p + sizeof(Block) <= a; p += sizeof(Block))
		*(Block *)(p) = b;
	while (p != a)
		*p++ = c;
}

评测结果