代码

#include <string.h>

void my_memset(char *a, char c, unsigned n)
{
	int x = c << 24 | c << 16 | c << 8 | c;
	while ((int)(a) & 3)
		*a++ = c, --n;
	while (n & 3)
		a[--n] = c;
	char *p = a;
	for (a += n; p != a; p += 4)
		*(int *)(p) = x;
}

评测结果