ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ariahi <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/11/02 19:10:27 by ariahi            #+#    #+#             */
/*   Updated: 2021/11/15 23:49:36 by ariahi           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	sign = 1;
	res = 0;
	i = 0;
	while (str[i] == ' ' || str[i] == '\n' || str[i] == '\t' || str[i] == '\v'
		|| str[i] == '\f' || str[i] == '\r')
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			sign = -1;
		i++;
	}
	while (str[i] >= 48 && str[i] <= 57)
	{
		res = res * 10 + str[i] - 48;
		i++;
	}
	return (res * sign);
}