Seluj78/Minishell

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi_nbase.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jlasne <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2016/11/28 11:07:50 by jlasne            #+#    #+#             */
/*   Updated: 2016/11/28 11:09:39 by jlasne           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int        ft_base(char c, int base)
{
    int                j;
    static char        tab[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8',
    '9', 'A', 'B', 'C', 'D', 'E', 'F'};

    if (c >= 'a' && c <= 'f')
        c -= 32;
    j = -1;
    while (++j <= base && c != tab[j])
        ;
    if (c == tab[j])
        return (j);
    return (-1);
}

static int        ft_atoi_nloop(const char *str, int base, int len)
{
    int        result;
    int        base_val;
    int        i;

    result = 0;
    i = 0;
    while ((ft_isdigit(str[i]) || (str[i] >= 'A' && str[i] <= 'F') ||
    (str[i] >= 'a' && str[i] <= 'f')) && len--)
    {
        base_val = ft_base(str[i], base);
        if (base_val == -1)
            return (result);
        result *= base;
        result += base_val;
        i++;
    }
    return (result);
}

unsigned int    ft_atoi_nbase(const char *str, int base, int len)
{
    int        i;
    int        n;

    i = 0;
    n = 1;
    if (base > 16)
        return (0);
    while (str[i] == ' ' || str[i] == '\n' || str[i] == '\v' ||
            str[i] == '\t' || str[i] == '\r' || str[i] == '\f')
        i++;
    if (str[i] == '-')
    {
        n = -1;
        i++;
    }
    return (n == -1 ? -ft_atoi_nloop(&str[i], base, len) :
    ft_atoi_nloop(&str[i], base, len));
}