ft_memmove.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_memmove.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: crea <crea@student.42roma.it>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/01/15 16:57:52 by crea              #+#    #+#             */
/*   Updated: 2024/02/05 14:42:07 by crea             ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/*	ft_memmove:
**	Moves 'len' bytes from memory area 'src' to memory area 'dest'.
**	Handles overlapping regions by copying from the end if 'dest' overlaps 'src'.
**	If either 'dest' or 'src' is NULL, returns NULL.
**	Returns a pointer to 'dest'.
*/
void	*ft_memmove(void *dest, const void *src, size_t len)
{
	size_t	i;

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