ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rrakman <rrakman@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/02 13:55:44 by rrakman           #+#    #+#             */
/*   Updated: 2022/10/08 19:34:00 by rrakman          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	ft_isspace(char c)
{
	if (c == '\f' || c == '\n' || c == '\r'
		|| c == '\t' || c == '\v' || c == ' ')
		return (1);
	else
		return (0);
}

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

	i = 0;
	sign = 1;
	res = 0;
	while (ft_isspace(str[i]))
		i++;
	if (str[i] == '+' || str[i] == '-')
	{
		if (str[i] == '-')
			sign = -1;
		i++;
	}
	while (ft_isdigit(str[i]))
	{
		res = res * 10 + (str[i] - '0');
		i++;
	}
	return (sign * res);
}