ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   atoi.c                                             :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: igilbert <igilbert@student.42perpignan.    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/26 19:37:19 by ivan              #+#    #+#             */
/*   Updated: 2024/11/04 13:13:38 by igilbert         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	size_t		i;
	long long	res;
	long long	signe;

	i = 0;
	signe = 1;
	res = 0;
	while (str[i] == ' ' || (str[i] >= 9 && str[i] <= 13))
		i++;
	if (str[i] == '+')
		i++;
	else if (str[i] == '-')
	{
		signe = -1;
		i++;
	}
	while (str[i] && str[i] >= '0' && str[i] <= '9')
	{
		res = res * 10 + str[i] - '0';
		i++;
	}
	return (res * signe);
}