ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jraymond <jraymond@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2017/11/13 15:29:35 by jraymond          #+#    #+#             */
/*   Updated: 2017/11/21 17:22:01 by jraymond         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int		ft_atoi(const char *str)
{
	int		i;
	int		result;
	int		negative;

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