ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: frgutier <frgutier@student.42malaga.com>   +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/09/19 14:15:39 by frgutier          #+#    #+#             */
/*   Updated: 2022/09/25 10:55:08 by frgutier         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	long	i;
	long	number;
	int		isneg;

	i = 0;
	number = 0;
	isneg = 0;
	while (str[i] != '\0' && (str[i] == ' ' || str[i] == '\t' || str[i] == '\n'
			|| str[i] == '\r' || str[i] == '\v' || str[i] == '\f'))
		i++;
	if (str[i] != '\0' && str[i] == '-')
	{
		isneg = 1;
		i++;
	}
	else if (str[i] == '+')
		i++;
	while (str[i] != '\0' && (ft_isdigit(str[i])))
	{
		number = (number * 10) + (str[i] - '0');
		i++;
	}
	if (isneg == 1)
		return (-number);
	return (number);
}