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ft_memmove.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_memmove.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: kakiba <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/07/12 00:06:08 by kakiba #+# #+# */
/* Updated: 2022/07/25 22:15:42 by kakiba ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
void *ft_memmove(void *dest, const void *src, size_t n)
{
size_t i;
if (dest == src)
return (dest);
if (dest < src)
{
i = 0;
while (i < n)
{
*(unsigned char *)(dest + i) = *(unsigned char *)(src + i);
i++;
}
}
else
{
i = 1;
while (i <= n)
{
*(unsigned char *)(dest + n - i) = *(unsigned char *)(src + n - i);
i++;
}
}
return (dest);
}
// int main(void)
// {
// char str3[] = "abcdefghijklmnopqrstu";
// char test3[] = "abcdefghijklmnopqrstu";
// char src [] = "1234567890";
// printf("before: %s\n", str3);
// memmove(str3, src, 10);
// printf("after: %s\n", str3);
// ft_memmove(test3, src, 10);
// printf("after: %s\n\n", test3);
// char str[] = "abcdefghijklmnopqrstu";
// char test[] = "abcdefghijklmnopqrstu";
// printf("before: %s\n", str);
// memmove(str + 5, str, 10);
// printf("after: %s\n", str);
// ft_memmove(test + 5, test, 10);
// printf("after: %s\n\n", test);
// char str2[] = "abcdefghijklmnopqrstu";
// char test2[] = "abcdefghijklmnopqrstu";
// printf("before: %s\n", str2);
// memmove(str2, str2 + 5, 10);
// printf("after: %s\n", str2);
// ft_memmove(test2, test2 + 5, 10);
// printf("after: %s\n\n", test2);
// printf("error_check: %s\n", (char *)memmove(str, NULL, 1));
// printf("error_check: %s\n", (char *)ft_memmove(str, NULL, 1));
// printf("error_check: %s\n", (char *)memmove(NULL, str, 1));
// printf("error_check: %s\n", (char *)ft_memmove(NULL, str, 1));
// printf("error_check: %s\n", (char *)memmove(NULL, NULL, 1));
// printf("error_check: %s\n", (char *)ft_memmove(NULL, NULL, 1));
// return 0;
// }
// int main()
// {
// char array[] = "akiba";
// char *ptr = "hello";
// printf("array:%s\n", array);
// printf("array ptr:%p\n", &array);
// printf("array ptr:%p\n", array);
// for (int i = 0; array[i]; ++i)
// {
// printf("array:%d, %p ", i, &array[i]);
// printf("array:%d, %p ", i, &array + i);
// }
// printf("\n");
// printf("ptr:%s\n", ptr);
// printf("ptr ptr:%p\n", ptr);
// printf("ptr ptr:%p\n", &ptr);
// for (int i = 0; ptr[i]; ++i)
// {
// printf("ptr:%d, %p ", i, &ptr[i]);
// printf("ptr:%d, %p ", i, (&ptr + i));
// }
// printf("\n");
// }
// // the differense between array and pointer is that
// // the variable of array is directly store
// // elements (find out G66), whereas pointer point
// // by a pointer and can be navigated using pointer.