63 lines
1.5 KiB
C
63 lines
1.5 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: dgaillet <dgaillet@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/11/07 13:06:35 by dgaillet #+# #+# */
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/* Updated: 2025/11/11 13:48:49 by dgaillet ### ########lyon.fr */
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/* */
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/* ************************************************************************** */
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#include "libft.h"
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static size_t count_digits(int n)
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{
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size_t size;
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size = 0;
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if (n <= 0)
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size++;
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while (n)
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{
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n /= 10;
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size++;
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}
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return (size);
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}
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static void insert_char(char *str, unsigned int nbr, size_t index)
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{
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while (nbr)
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{
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str[index--] = nbr % 10 + '0';
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nbr /= 10;
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}
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}
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char *ft_itoa(int n)
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{
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unsigned int nbr;
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char *str;
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size_t size;
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nbr = n;
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if (n < 0)
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nbr = n * -1;
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size = count_digits(n);
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str = malloc(sizeof(char) * (size + 1));
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if (!str)
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return (NULL);
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str[size] = '\0';
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if (nbr == 0)
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str[0] = '0';
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else
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{
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if (n < 0)
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str[0] = '-';
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insert_char(str, nbr, size - 1);
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}
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return (str);
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}
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