83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ft_itoa_base.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: aortigos <aortigos@student.42malaga.com +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2023/09/22 20:46:43 by aortigos #+# #+# */
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/* Updated: 2025/11/16 19:04:48 by aortigos ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "libft.h"
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static int mem_str(int base)
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{
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if (base == 2)
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return (sizeof(int) * 8);
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else if (base == 8)
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return (22);
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else if (base == 16)
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return (16);
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return (0);
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}
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static void test(int base, char *str, int i, unsigned int digit)
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{
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if (base == 2 || base == 8)
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str[i] = '0' + digit;
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else if (base == 16)
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{
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if (digit < 10)
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str[i] = '0' + digit;
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else
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str[i] = 'a' + digit - 10;
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}
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}
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static char *str_invert(char *str, int index)
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{
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int i;
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int j;
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char temp;
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i = 0;
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j = index - 1;
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while (i < j)
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{
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temp = str[i];
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str[i] = str[j];
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str[j] = temp;
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i++;
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j--;
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}
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return (str);
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}
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char *ft_itoa_base(unsigned long long ul, int base)
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{
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char *str;
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int i;
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unsigned int digit;
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if (base != 2 && base != 8 && base != 16)
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return (NULL);
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str = (char *)malloc(sizeof(char) * (mem_str(base) + 1));
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if (!str)
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return (NULL);
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i = 0;
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while (ul > 0)
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{
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digit = ul % base;
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test(base, str, i, digit);
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ul /= base;
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i++;
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}
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if (i == 0)
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str[i++] = '0';
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str[i] = 0;
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str_invert(str, i);
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return (str);
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}
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