代码

void my_memset(char *a, char c, unsigned n)
{
	while (n & 3)
		a[--n] = c;
	int x = c << 24 | c << 16 | c << 8 | c;
	int *b = (int *)(a), *e = (int *)(a + n);
	while (b != e)
		*b++ = x;
}

评测结果