ft_itoa.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: olachgue <olachgue@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/05 11:20:25 by olachgue          #+#    #+#             */
/*   Updated: 2024/11/11 11:57:07 by olachgue         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static size_t	count_digits(int n)
{
	size_t	count;

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

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

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