ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rel-fila <rel-fila@student.1337.ma>        +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/16 14:05:34 by rel-fila          #+#    #+#             */
/*   Updated: 2022/10/27 00:39:37 by rel-fila         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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