ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: sel-mars <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/11/01 15:47:39 by sel-mars          #+#    #+#             */
/*   Updated: 2021/11/06 18:48:17 by sel-mars         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int	i;
	int	sign;
	int	rslt;

	i = 0;
	rslt = 0;
	sign = 1;
	while (str[i] == 32 || (str[i] >= 9 && str[i] <= 13))
		i++;
	if (str[i] == 43)
	{
		sign = 1;
		i++;
	}
	else if (str[i] == 45)
	{
		sign = -1;
		i++;
	}
	while (str[i] != '\0' && str[i] >= 48 && str[i] <= 57)
	{
		rslt = rslt * 10 + str[i] - 48;
		i++;
	}
	return (sign * rslt);
}