#include <string.h>

int strncmp(CONST char *s1, CONST char *s2, size_t n)
	{
	while (n-- && *s1 && *s2 && *s1 == *s2)
		{
		s1++;
		s2++;
		}
	if ((n+1) == 0 || *s1 == *s2)
		return 0;
	if (*s1 < *s2)
		return -1;
	return 1;
	}