ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: nromptea <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2015/11/24 18:11:37 by nromptea          #+#    #+#             */
/*   Updated: 2015/11/27 23:43:57 by nromptea         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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