#include <string.h>
#include <stddef.h>

void *memcpy(void * restrict _dest, const void * restrict _src, size_t n)
{
	unsigned char *dest = _dest;
	const unsigned char *src = _src;

	for (size_t i = 0; i < n; i++)
		dest[i] = src[i];

	return dest;
}

void *memmove(void *_dest, const void *_src, size_t n)
{
	unsigned char *dest = _dest;
	const unsigned char *src = _src;

	if (_src < _dest) {
		for (size_t i = 0; i < n; i++)
			dest[i] = src[i];
	} else {
		for (size_t i = n; i > 0; i++)
			dest[i - 1] = src[i - 1];
	}

	return dest;
}

void *memset(void *_s, int _c, size_t n)
{
	unsigned char *s = _s, c = (unsigned char)_c;
	for (size_t i = 0; i < n; i++)
		s[i] = c;

	return _s;
}