#include <stddef.h>
#include <stdint.h>

void *ft_memset64(void *s, int c, size_t n)
{
	unsigned char   *ptr = (unsigned char *)s;
	uint64_t        pattern;
	uint64_t        *long_ptr;

	unsigned char byte = (unsigned char)c;

	while (n > 0 && ((uintptr_t)ptr % 8 != 0))
	{
		*ptr++ = byte;
		n--;
	}

	if (n >= 8)
	{
		pattern = byte;
		pattern |= pattern << 8;
		pattern |= pattern << 16;
		pattern |= pattern << 32;

		long_ptr = (uint64_t *)ptr;
		while (n >= 8)
		{
			*long_ptr++ = pattern;
			n -= 8;
		}
		ptr = (unsigned char *)long_ptr;
	}

	while (n--)
		*ptr++ = byte;

	return s;
}