ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tmoska <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2016/11/17 16:19:54 by tmoska            #+#    #+#             */
/*   Updated: 2016/11/17 16:19:57 by tmoska           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int neg;
	int res;

	res = 0;
	neg = 1;
	while (*str == ' ' || *str == '\t' || *str == '\n' ||
		*str == '\v' || *str == '\f' || *str == '\r')
		str++;
	if (*str == '-' || *str == '+')
	{
		if (*str == '-')
			neg = -1;
		str++;
	}
	while (*str >= '0' && *str <= '9')
	{
		res *= 10;
		res += *str - 48;
		str++;
	}
	return (res * neg);
}