ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mesafi <mesafi@student.1337.ma>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/01/15 10:37:49 by mesafi            #+#    #+#             */
/*   Updated: 2020/01/15 10:38:06 by mesafi           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	i = 0;
	sign = 1;
	while ((*str >= 9 && *str <= 13) || *str == 32)
		str++;
	if (*str == '-')
		sign = -1;
	if (*str == '-' || *str == '+')
		str++;
	while (*str >= '0' && *str <= '9')
	{
		i = i * 10 + (*str - 48);
		str++;
		if (sign == 1 && i < 0)
			return (-1);
		if (sign == -1 && i < 0)
			return (0);
	}
	return (i * sign);
}