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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_convert_base.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/07/08 16:16:53 by cacharle #+# #+# */
/* Updated: 2019/07/12 12:07:28 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include <stdlib.h>
int check_base(char *base);
int ft_pow(int base, int exponent);
int position_in_base(char digit, char *base);
int some_strlen(char *str);
int from_base(char *str, char *base)
{
int radix;
int i;
int j;
int nb;
int is_negative;
while (*str == ' ' || *str == '\t' || *str == '\n'
|| *str == '\v' || *str == '\f' || *str == '\r')
str++;
is_negative = 0;
while (*str == '-' || *str == '+')
if (*str++ == '-')
is_negative = !is_negative;
nb = 0;
radix = 0;
while (base[radix])
radix++;
i = 0;
while (position_in_base(str[i], base) != -1)
i++;
j = 0;
while (--i >= 0)
nb += ft_pow(radix, i) * position_in_base(str[j++], base);
return (is_negative ? -nb : nb);
}
char *to_base(int nbr, char *base, int radix, int is_negative)
{
int i;
int j;
unsigned int nbu;
char rev_digits[1024];
char *ret;
nbu = nbr;
if (is_negative)
nbu = -nbr;
i = nbu == 0 ? 1 : 0;
rev_digits[0] = base[0];
while (nbu > 0)
{
rev_digits[i] = base[nbu % radix];
nbu /= radix;
i++;
}
ret = malloc(sizeof(char) * i + (is_negative ? 1 : 0));
j = 0;
if (is_negative)
ret[0] = '-';
while (i-- + (is_negative ? 1 : 0) > 0)
ret[j++ + (is_negative ? 1 : 0)] = rev_digits[i];
ret[j] = '\0';
return (ret);
}
char *ft_convert_base(char *nbr, char *base_from, char *base_to)
{
int nb;
char *parsed_nbr;
if (!check_base(base_from) || !check_base(base_to))
return (NULL);
parsed_nbr = nbr;
nb = from_base(parsed_nbr, base_from);
return (to_base(nb, base_to, some_strlen(base_to), nb < 0));
}
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