#include <string.h>

int memcmp(void *s1, void *s2, size_t n)
	{
	unsigned char *cs1 = s1, *cs2 = s2;

	while (n-- && *cs1 == *cs2)
		{
		cs1++;
		cs2++;
		}
	if ((n+1) == 0 || *cs1 == *cs2)
		return 0;
	if (*cs1 < *cs2)
		return -1;
	return 1;
	}