ft_ltoa.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_ltoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tspoof <tspoof@student.hive.fi>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/11/05 18:54:42 by tspoof            #+#    #+#             */
/*   Updated: 2022/12/09 16:16:25 by tspoof           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
 
static int  ft_char_count(unsigned long n)
{
    int     i;
 
    i = 1;
    while (n >= 10)
    {
        n = n / 10;
        i++;
    }
    return (i);
}
 
static char *ft_ltostr(int sign, unsigned long len, unsigned long n, char *str)
{
    while (len)
    {
        str[len - 1] = (n % 10) + '0';
        n = n / 10;
        len--;
    }
    if (sign == -1)
        str[0] = '-';
    return (str);
}
 
char    *ft_ltoa(long n)
{
    char            *result;
    int             sign;
    unsigned long   num;
    unsigned int    len;
 
    sign = 1;
    len = 0;
    if (n < 0)
    {
        sign = -1;
        num = n * -1;
        len++;
    }
    else
        num = n;
    len = len + ft_char_count(num);
    result = (char *)ft_calloc(len + 1, sizeof(char));
    if (!result)
        return (NULL);
    result = ft_ltostr(sign, len, num, result);
    return (result);
}