OrionLibC

#include <stddef.h>

/* Copy one region of memory to another */
int
memcmp(void *s1, void *s2, size_t n)
{
	unsigned char *a = (unsigned char *) s1,
	              *b = (unsigned char *) s2;
	while (n-- > 0)
			if (*a++ != *b++)
				return a[-1] - b[-1];
	return 0;
}