/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_memmove.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/15 13:57:12 by kcolin            #+#    #+#             */
/*   Updated: 2024/10/15 14:12:15 by kcolin           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/*
 * case 1: dst overlaps at start of src. 
 * src is before dst.
 * copy back to front
 *
 * case 2: dst overlaps at beginning of src.
 * src is after dst.
 * copy front to back.
 *
 * case 3: dst and src do not overlap
 * it doesn't matter how the data is copied
 * merge with case 2
 */
void	*ft_memmove(void *dst, const void *src, t_size len)
{
	t_size	i;

	if (dst >= src && dst <= (src + len))
	{
		i = len;
		while (i > 0)
		{
			i--;
			((char *)dst)[i] = ((char *)src)[i];
		}
	}
	else
	{
		ft_memcpy(dst, src, len);
	}
	return (dst);
}