119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ft_convert_base.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: pbonilla <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2020/09/22 19:22:14 by pbonilla #+# #+# */
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/* Updated: 2021/03/19 18:42:40 by pbonilla ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "libft.h"
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#include <stdio.h>
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int isinbase(char c, char *base)
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{
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int i;
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i = 0;
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while (base[i])
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{
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if (base[i] == c)
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return (i);
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++i;
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}
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return (-1);
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}
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long ft_atoi_base(char *str, char *base)
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{
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int len_base;
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int i;
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int signe;
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long long nbr;
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signe = 1;
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i = 0;
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nbr = 0;
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len_base = ft_strlen(base);
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while (str[i] == '-' || str[i] == '+')
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{
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if (str[i] == '-')
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signe *= -1;
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i++;
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}
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while (isinbase(str[i], base) >= 0)
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{
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nbr = (len_base * nbr) + isinbase(str[i], base);
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i++;
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}
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return (signe * nbr);
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}
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int get_size_in_char(long long nbr, int len_base)
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{
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int i;
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i = 1;
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if (nbr < 0)
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++i;
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while (nbr / len_base)
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{
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nbr = nbr / len_base;
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++i;
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}
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return (i);
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}
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char *write_base(char *str, long long nbr, char *base, int *i_sgn)
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{
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int len_base;
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long long nb;
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len_base = ft_strlen(base);
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nb = nbr;
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if (nb < 0)
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nb *= -1;
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if (nb >= len_base)
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{
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str[i_sgn[0]] = base[nb % len_base];
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i_sgn[0] += 1;
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write_base(str, nb / len_base, base, i_sgn);
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}
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else
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{
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str[i_sgn[0]] = base[nb];
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if (i_sgn[1])
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str[i_sgn[0] + 1] = '-';
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str[i_sgn[0] + 1 + i_sgn[1]] = 0;
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}
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return (str);
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}
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char *ft_convert_base(char *nbr, char *base_from, char *base_to)
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{
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char *str;
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int len_base;
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int size_char;
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long long number;
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int i_sgn[2];
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i_sgn[0] = 0;
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i_sgn[1] = 0;
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if (!nbr || !base_from || !base_to)
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return (NULL);
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number = ft_atoi_base(nbr, base_from);
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len_base = ft_strlen(base_to);
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size_char = get_size_in_char(number, len_base);
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if (!(str = malloc(sizeof(char) * (size_char + 1))))
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return (ft_strdup(""));
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if (number < 0)
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i_sgn[1] = 1;
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str = write_base(str, number, base_to, i_sgn);
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str[size_char] = 0;
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ft_rev_int_tab(str, size_char);
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return (str);
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}
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