ft_memcpy - chanhl22/libft GitHub Wiki

  1 /* ************************************************************************** */
  2 /*                                                                            */
  3 /*                                                        :::      ::::::::   */
  4 /*   ft_memcpy.c                                        :+:      :+:    :+:   */
  5 /*                                                    +:+ +:+         +:+     */
  6 /*   By: chanhlee <[email protected].>       +#+  +:+       +#+        */
  7 /*                                                +#+#+#+#+#+   +#+           */
  8 /*   Created: 2021/01/13 22:27:09 by chanhlee          #+#    #+#             */
  9 /*   Updated: 2021/02/01 18:15:20 by chanhlee         ###   ########.fr       */
 10 /*                                                                            */
 11 /* ************************************************************************** */
 12 
 13 #include "libft.h"
 14 
 15 void    *ft_memcpy(void *dest, const void *source, size_t num)
 16 {
 17     unsigned char *src;
 18     unsigned char *dst;
 19     size_t i;
 20 
 21     i = 0;
 22     if (dest == NULL && source == NULL)  //dest와 source가 NULL이면 NULL을 반환해야한다!
 23         return (NULL);                                                                    
 24     src = (unsigned char *)source;
 25     dst = (unsigned char *)dest;
 26     while (i < num)
 27     {
 28         dst[i] = src[i];
 29         i++;
 30     }
 31     return (dest);
 32 }