ft_itoa.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hshinaga <hshinaga@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/02 19:49:49 by hshinaga          #+#    #+#             */
/*   Updated: 2024/11/02 19:50:50 by hshinaga         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	get_num_len(int n)
{
	int	len;

	if (n == 0)
		return (1);
	len = 0;
	if (n < 0)
		len++;
	while (n != 0)
	{
		n /= 10;
		len++;
	}
	return (len);
}

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

	len = get_num_len(n);
	result = (char *)malloc(sizeof(char) * (len + 1));
	if (!result)
		return (NULL);
	result[len] = '\0';
	num = n;
	if (num < 0)
	{
		result[0] = '-';
		num = -num;
	}
	if (num == 0)
		result[0] = '0';
	while (num > 0)
	{
		result[--len] = (num % 10) + '0';
		num /= 10;
	}
	return (result);
}