ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hbaddrul <hbaddrul@student.42kl.edu.my>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/04/28 14:09:31 by hbaddrul          #+#    #+#             */
/*   Updated: 2021/08/26 16:23:09 by hbaddrul         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include <limits.h>
#include "libft.h"

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

	ret = 0;
	sign = 1;
	while (ft_isspace(*str))
		++str;
	if (*str == '+' || *str == '-')
		if (*(str++) == '-')
			sign *= -1;
	while (ft_isdigit(*str))
	{
		ret = ret * 10 + sign * (*str++ - '0');
		if (ret > INT_MAX)
			return (-1);
		else if (ret < INT_MIN)
			return (0);
	}
	return ((int)ret);
}