libft/ft_itoa.c at main · usefJoseph/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ychihab <ychihab@student.1337.ma>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/06 11:36:34 by ychihab           #+#    #+#             */
/*   Updated: 2022/10/24 08:15:47 by ychihab          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	ft_count_int(int n)
{
	int				i;
	unsigned int	nbr;

	i = 0;
	if (n == 0)
		i = 1;
	if (n < 0)
	{
		nbr = n * -1;
		i = 1;
	}
	else
		nbr = n;
	while (nbr)
	{
		nbr = nbr / 10;
		i++;
	}
	return (i);
}

char	*ft_itoa(int n)
{
	char			*ptr;
	int				size;
	unsigned int	nbr;

	size = ft_count_int(n);
	ptr = malloc((size + 1) * sizeof(char));
	if (ptr == NULL)
		return (0);
	ptr[size] = '\0';
	if (n == 0)
		ptr[0] = n + '0';
	if (n < 0)
	{
		ptr[0] = '-';
		nbr = n * -1;
	}
	else
		nbr = n;
	while (nbr)
	{
		ptr[size - 1] = nbr % 10 + '0';
		nbr = nbr / 10;
		size--;
	}
	return (ptr);
}