ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ilamim <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/11/03 23:53:51 by ilamim            #+#    #+#             */
/*   Updated: 2021/11/04 00:39:42 by ilamim           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_isspace(int c)
{
	return (c == 32 || (c >= 9 && c <= 13));
}

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

	num = 0;
	sign = 1;
	while (ft_isspace((int)*str))
		str++;
	if (*str == '+' || *str == '-')
	{
		if (*str == '-')
			sign = -sign;
		str++;
	}
	while (ft_isdigit((int)*str))
	{
		num = (num * 10) + (*str - '0');
		str++;
	}
	return (sign * num);
}