ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ioleksiu <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2016/12/09 18:17:31 by ioleksiu          #+#    #+#             */
/*   Updated: 2016/12/15 16:57:05 by ioleksiu         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include <stdlib.h>

int	ft_atoi(const char *str)
{
	int	sign;
	int	number;

	number = 0;
	sign = 1;
	while (*str == ' ' || (*str > 8 && *str < 14))
		str++;
	if (*str == '-')
	{
		sign = -1;
		str++;
	}
	else if (*str == '+')
		str++;
	while (*str >= '0' && *str <= '9')
	{
		number *= 10;
		number += *str - 48;
		str++;
	}
	return (number * sign);
}