ft_memmove.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_memmove.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: apuchill <apuchill@student.42sp.org.br>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/01/27 13:05:26 by apuchill          #+#    #+#             */
/*   Updated: 2020/10/30 19:52:35 by apuchill         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

/*
** LIBRARY: <string.h>
** SYNOPSIS: copy byte string
**
** DESCRIPTION:
** 		The memmove() function copies n bytes from string s2 to string s1.  The
**	two strings may overlap; the copy is always done in a non-destructive
**	manner.
*/

#include "libft.h"

void	*ft_memmove(void *dst, const void *src, size_t len)
{
	size_t i;

	if (!dst && !src)
		return (0);
	i = 0;
	if ((size_t)dst - (size_t)src < len)
	{
		i = len - 1;
		while (i < len)
		{
			((unsigned char *)dst)[i] = ((unsigned char *)src)[i];
			i--;
		}
	}
	else
	{
		while (i < len)
		{
			((unsigned char *)dst)[i] = ((unsigned char *)src)[i];
			i++;
		}
	}
	return (dst);
}