ft_itoa.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gyong-si <gyongsi@student.42.fr>           +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/09/20 13:02:16 by gyong-si          #+#    #+#             */
/*   Updated: 2023/09/22 16:48:45 by gyong-si         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"
#include <limits.h>
#include <stdio.h>

size_t	ft_nbrlen(int n)
{
	size_t	i;

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

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

	if (n == INT_MIN)
		return (ft_strdup("-2147483648"));
	len = ft_nbrlen(n);
	result = ft_calloc(len + 1, sizeof(char));
	if (!result)
		return (NULL);
	if (n == 0)
		result[0] = '0';
	if (n < 0)
	{
		result[0] = '-';
		n = -n;
	}
	result[len] = '\0';
	len--;
	while (len >= 0 && n != 0)
	{
		result[len] = n % 10 + '0';
		len--;
		n /= 10;
	}
	return (result);
}