ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: javellis <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/05 11:59:48 by javellis          #+#    #+#             */
/*   Updated: 2022/10/05 11:59:53 by javellis         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int	sign;
	int	result;

	sign = 1;
	result = 0;
	while ((*str >= 9 && *str <= 13) || *str == ' ')
	{
		str++;
	}
	if (*str == '-')
	{
		sign *= -1;
		str++;
	}
	else if (*str == '+')
		str++;
	if (*str == '-' || *str == '+')
		return (0);
	while (*str != '\0' && *str >= '0' && *str <= '9')
	{
		result *= 10;
		result += *str - '0';
		str++;
	}
	return (result * sign);
}