ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: xle-baux <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/11/25 15:24:30 by xle-baux          #+#    #+#             */
/*   Updated: 2021/12/03 10:38:16 by xle-baux         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int			i;
	int			sign;
	long int	nb;

	i = 0;
	sign = 1;
	nb = 0;
	while (str[i] == '\t' || str[i] == '\v' || str[i] == '\n'
		|| str[i] == '\f' || str[i] == '\r' || str[i] == ' ')
		i++;
	if (str[i] == '-')
	{
		sign = -1;
		i++;
	}
	else if (str[i] == '+')
		i++;
	while (str[i] >= '0' && str[i] <= '9')
	{
		nb = nb * 10 + (str[i] - 48);
		i++;
	}
	nb = nb * sign;
	return (nb);
}