119 lines
2.7 KiB
C
119 lines
2.7 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: jhalford <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2016/08/07 23:31:20 by jhalford #+# #+# */
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/* Updated: 2016/08/25 17:32:17 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include <stdlib.h>
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#define ABS(x) (((x) < 0) ? -(x) : (x))
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#define NEG(x) (((x) < 0) ? 1 : 0)
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#define POS(x) (((x) > 0) ? 1 : 0)
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void ft_putchar(char c);
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int get_size(char *str)
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{
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int i;
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int j;
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i = 0;
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while (str[i] != '\0')
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{
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if (str[i] == '+' || str[i] == '-')
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return (0);
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if (str[i] < 32 || str[i] > 126)
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return (0);
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j = 0;
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while (j < i)
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{
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if (str[j] == str[i])
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return (0);
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j++;
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}
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i++;
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}
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return (i);
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}
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int get_pos(char c, char *str)
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{
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int i;
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i = 0;
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while (c != str[i] && str[i])
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i++;
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return (i);
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}
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int ft_check_str(char *str, char *base, int base_size)
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{
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while (*str)
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{
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if (!(get_pos(*str, base) < base_size || *str == '-' || *str == '+'))
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return (0);
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str++;
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}
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return (1);
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}
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char *ft_itoa_base(int nbr, char *base, int base_size)
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{
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int i;
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int len;
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int neg;
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int result[1000];
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char *final;
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i = 0;
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neg = (nbr < 0);
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final = (char *)malloc(sizeof(char) * 2);
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*final = '\0';
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if (base_size > 1)
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{
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while (nbr)
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{
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result[i++] = ABS(nbr % base_size);
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nbr /= base_size;
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}
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len = i;
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final = (char *)malloc(sizeof(final) * (len + 1 + NEG(nbr)));
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final[POS(nbr)] = '-';
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final[len + 1 + NEG(nbr)] = '\0';
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while (--i >= 0)
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final[i + NEG(nbr)] = base[result[len - i - 1]];
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}
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return (final);
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}
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char *ft_convert_base(char *str, char *base_from, char *base_to)
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{
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int base_size;
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int res;
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int sign;
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base_size = get_size(base_from);
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res = 0;
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sign = 1;
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if (!ft_check_str(str, base_from, base_size))
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return (ft_itoa_base(0, "0", 1));
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if (base_size > 1)
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{
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if (*str == '-' || *str == '+')
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{
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if (get_pos(*(str + 1), base_from) < base_size)
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sign = (*str == '+') ? 1 : -1;
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else
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return (ft_itoa_base(0, "0", 1));
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str++;
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}
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while (get_pos(*str, base_from) < base_size)
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res = res * base_size + sign * get_pos(*str++, base_from);
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}
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return (ft_itoa_base(res, base_to, get_size(base_to)));
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}
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