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ft_memcpy.c
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ft_memcpy.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_memcpy.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: akyoshid <akyoshid@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/11/16 11:34:31 by akyoshid #+# #+# */
/* Updated: 2023/11/17 21:08:07 by akyoshid ### ########.fr */
/* */
/* ************************************************************************** */
// === DESCRIPTION ===
// The memcpy() function copies n bytes from memory area src to memory area dst.
// If dst and src overlap, behavior is undefined.
// Applications in which dst and src might overlap should use memmove instead.
// === BEHAVIOR ===
// If both of dst and src are NULL, memcpy() returns NULL.
#include "libft.h"
void *ft_memcpy(void *dst, const void *src, size_t n)
{
unsigned char *dst_ptr;
unsigned char *src_ptr;
size_t i;
if (dst == NULL && src == NULL)
return (NULL);
dst_ptr = (unsigned char *)dst;
src_ptr = (unsigned char *)src;
i = 0;
while (i < n)
{
dst_ptr[i] = src_ptr[i];
i++;
}
return (dst);
}
// int main(void)
// {
// char str1[22] = "abcdefghijklmnopqrstu";
// char str2[22] = "abcdefghijklmnopqrstu";
// // char *str1 = NULL;
// // char *str2 = NULL;
// memcpy(str1 + 4, str1, 10);
// ft_memcpy(str2 + 4, str2, 10);
// // memcpy(str1, str2, 10);
// // ft_memcpy(str1, str2, 10);
// printf("%s\n", str1);
// printf("%s\n", str2);
// return (0);
// }