ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: abouramd <abouramd@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/07 17:02:33 by abouramd          #+#    #+#             */
/*   Updated: 2022/11/19 00:19:19 by abouramd         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int				sign;
	long			res;
	long			t;

	sign = 1;
	res = 0;
	while (*str == ' ' || (*str <= 13 && *str >= 9))
		str++;
	if (*str == '-' || *str == '+')
	{
		if (*str == '-')
			sign = -1;
		str++;
	}
	while (*str <= '9' && *str >= '0')
	{
		t = (res * 10) + (*str - '0');
		if (res > t)
			return (0 - (sign > 0));
		res = t;
		str++;
	}
	return (sign * res);
}