ft_memmove.c

/* ************************************************************************** */
/*                                                          LE - /            */
/*                                                              /             */
/*   ft_memmove.c                                     .::    .:/ .      .::   */
/*                                                 +:+:+   +:    +:  +:+:+    */
/*   By: brobicho <marvin@le-101.fr>                +:+   +:    +:    +:+     */
/*                                                 #+#   #+    #+    #+#      */
/*   Created: 2017/12/04 03:19:56 by brobicho     #+#   ##    ##    #+#       */
/*   Updated: 2017/12/04 03:19:56 by brobicho    ###    #+. /#+    ###.fr     */
/*                                                         /                  */
/*                                                        /                   */
/* ************************************************************************** */

#include "libft.h"

void	*ft_memmove(void *dest, const void *src, size_t n)
{
	char		*dst_cpy;
	const char	*src_cpy;

	dst_cpy = dest;
	src_cpy = (char*)src;
	if (src_cpy == dst_cpy)
		return (dest);
	if (src_cpy < dst_cpy)
	{
		src_cpy = (char*)(src + n) - 1;
		dst_cpy = (dest + n) - 1;
		while (n--)
			*dst_cpy-- = *src_cpy--;
	}
	else
	{
		while (n)
		{
			*dst_cpy++ = *src_cpy++;
			n--;
		}
	}
	return (dest);
}