Nucleus

#include <stddef.h>

/* Fill a region of memory with specified byte */
void *
memset(void *dest, int byte, size_t len)
{
	unsigned char *a = dest;
	if (len > 0) {
		while (len-- > 0)
			*a++ = byte;
	}
	return dest;
}

/* 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;
}

/* Copy one region of memory to another */
void *
memcpy(void *dest, void *src, size_t n)
{
	unsigned char *a = (unsigned char *) dest,
	              *b = (unsigned char *) src;
	while (n-- > 0)
		*a++ = *b++;
	return dest;
}