ft_itoa.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: apuchill <apuchill@student.42sp.org.br>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/12/13 15:23:36 by exam              #+#    #+#             */
/*   Updated: 2020/02/19 14:03:51 by apuchill         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

/*
** LIBRARY: N/A
** SYNOPSIS: convert integer to ASCII string
**
** DESCRIPTION:
** 		Allocates (with malloc(3)) and returns a string representing the
**	integer received as an argument. Negative numbers must be handled.
*/

#include "libft.h"

char	*ft_itoa(int n)
{
	char	*str;
	long	nbr;
	size_t	size;

	nbr = n;
	size = n > 0 ? 0 : 1;
	nbr = nbr > 0 ? nbr : -nbr;
	while (n)
	{
		n /= 10;
		size++;
	}
	if (!(str = (char *)malloc(size + 1)))
		return (0);
	*(str + size--) = '\0';
	while (nbr > 0)
	{
		*(str + size--) = nbr % 10 + '0';
		nbr /= 10;
	}
	if (size == 0 && str[1] == '\0')
		*(str + size) = '0';
	else if (size == 0 && str[1] != '\0')
		*(str + size) = '-';
	return (str);
}