ft_itoa.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: unite <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/09/05 14:16:34 by unite             #+#    #+#             */
/*   Updated: 2020/07/16 03:04:24 by unite            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
#include <stdlib.h>
#include <limits.h>
 
static size_t   ft_int_len(int n)
{
    size_t  i;
 
    i = 1;
    while (n /= 10)
        i++;
    return (i);
}
 
char            *ft_itoa(int n)
{
    char    *str;
    size_t  len;
    int     tmp;
 
    len = ft_int_len(n);
    tmp = n < 0 ? n : -n;
    if (n < 0)
        len++;
    if (!(str = ft_strnew(len)))
        return (NULL);
    while (tmp)
    {
        str[--len] = -(tmp % 10) + '0';
        tmp /= 10;
    }
    if (n < 0)
        str[--len] = '-';
    return (str);
}