ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hgabriel <hgabriel@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/05/10 10:31:18 by hgabriel          #+#    #+#             */
/*   Updated: 2022/05/10 10:32:50 by hgabriel         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *nptr)
{
	int	i;
	int	sign;
	int	result;

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