correction memcpy pour le cas ou dst et src sont nuls

srcs/ft_memcpy.c

@@ -6,7 +6,7 @@
 /*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/11/25 13:56:16 by hulamy            #+#    #+#             */
-/*   Updated: 2019/11/25 13:56:17 by hulamy           ###   ########.fr       */
+/*   Updated: 2019/11/28 13:45:23 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,18 +14,37 @@
 ** copy n characters from src to dst and return dst
 */
 
+/*
+**	#include <libc.h>
+**
+**	void	*ft_memcpy(void *dst, const void *src, size_t n);
+**
+**	int		main(int ac, char **av)
+**	{
+**		if (ac == 4)
+**		{
+**			printf("%s\n", ft_memcpy(av[1], av[2], atoi(av[3])));
+**		}
+**		else
+**		{
+**			printf("%s\n", ft_memcpy("troubadour", "bravo", 4));
+**		}
+**		return (0);
+**	}
+*/
+
 #include "libft.h"
 
 void	*ft_memcpy(void *dst, const void *src, size_t n)
 {
-	size_t	i;
 	char	*ptr;
 	char	*ptr2;
 
 	ptr = (char *)dst;
 	ptr2 = (char *)src;
-	i = -1;
-	while (++i < n)
-		ptr[i] = ptr2[i];
+	if (dst == src)
+		return (dst);
+	while (n--)
+		ptr[n] = ptr2[n];
 	return (dst);
 }