ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jamrabhi <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/10/07 15:55:08 by jamrabhi          #+#    #+#             */
/*   Updated: 2021/06/05 17:37:15 by jamrabhi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int	i;
	int	rt;
	int	testneg;

	i = 0;
	rt = 0;
	testneg = 0;
	while ((str[i] >= '\t' && str[i] <= '\r') || str[i] == ' ')
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			testneg = 1;
		i++;
	}
	while (str[i] && (str[i] >= '0' && str[i] <= '9'))
	{
		rt = ((rt * 10) + str[i]) - '0';
		i++;
	}
	if (testneg == 1)
		rt = rt * -1;
	return (rt);
}