ft_itoa.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tspoof <tspoof@student.hive.fi>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/11/05 18:54:42 by tspoof            #+#    #+#             */
/*   Updated: 2022/11/30 16:47:36 by tspoof           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
 
static int  ft_itoa_size(long num)
{
    int     i;
 
    i = 1;
    if (num < 0)
    {
        num = num * -1;
        i++;
    }
    while (num >= 10)
    {
        num = num / 10;
        i++;
    }
    return (i);
}
 
static char *ft_itoa_rec(long num, int sign, char *str)
{
    static int  i = 1;
    int         current_i;
 
    current_i = i;
    if (num >= 10)
    {
        i++;
        ft_itoa_rec(num / 10, sign, str);
    }
    if (num < 10)
    {
        if (sign == -1 && str)
        {
            str[0] = '-';
            i++;
        }
    }
    if (str)
        str[i - current_i] = num % 10 + '0';
    return (str);
}
 
char    *ft_itoa(int n)
{
    char    *str;
    long    num;
    int     sign;
 
    sign = 1;
    num = n;
    str = (char *)ft_calloc(ft_itoa_size(num) + 1, sizeof(char));
    if (!str)
        return (NULL);
    if (num < 0)
    {
        num = num * -1;
        sign = -1;
    }
    str = ft_itoa_rec(num, sign, str);
    return (str);
}