67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ft_itoa.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: mcolonna <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2023/10/03 13:51:10 by mcolonna #+# #+# */
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/* Updated: 2023/10/04 16:49:44 by mcolonna ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include <stdlib.h>
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#include "libft.h"
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static char get_digit_at(long pos_n, int i, int nb_len)
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{
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int w;
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long ten_power;
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w = nb_len - i - 1;
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ten_power = 1;
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while (w--)
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ten_power *= 10;
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return ('0' + pos_n / ten_power % 10);
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}
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static int get_nb_len(long pos_n)
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{
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int r;
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long ten_powers;
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r = 1;
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ten_powers = 10;
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while (pos_n >= ten_powers)
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{
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r++;
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ten_powers *= 10;
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}
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return (r);
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}
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char *ft_itoa(int n)
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{
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long pos_n;
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int sign;
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int nb_len;
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char *dest;
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int i;
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sign = (n >= 0) - (n < 0);
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pos_n = (long)n * sign;
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nb_len = get_nb_len(pos_n);
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dest = malloc(((sign == -1) + nb_len + 1) * sizeof(char));
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if (!dest)
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return (NULL);
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i = 0;
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if (sign == -1)
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dest[i++] = '-';
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while (i - (sign == -1) < nb_len)
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{
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dest[i] = get_digit_at(pos_n, i - (sign == -1), nb_len);
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i++;
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}
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dest[i] = '\0';
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return (dest);
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}
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