libft/ft_itoa.c at master · badi361/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: bguzel <bguzel@student.42.fr>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/25 16:59:52 by bguzel            #+#    #+#             */
/*   Updated: 2022/10/28 17:33:01 by bguzel           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_digits(long int nb, int *check)
{
	int	len;

	len = 0;
	if (nb == 0)
		return (1);
	if (nb < 0)
	{
		nb *= -1;
		*check += 1;
		len++;
	}
	while (nb > 0)
	{
		nb = nb / 10;
		len++;
	}
	return (len);
}

char	*ft_itoa(int n)
{
	char	*str;
	int		len;
	long	num;
	int		ctr;

	num = n;
	ctr = 0;
	len = ft_digits(num, &ctr);
	str = malloc((len + 1) * sizeof(char));
	if (!str)
		return (NULL);
	str[len] = 0;
	if (ctr)
	{
		str[0] = '-';
		num *= -1;
	}
	while (--len >= ctr)
	{
		str[len] = (num % 10) + '0';
		num /= 10;
	}
	return (str);
}