ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tbrowang <contact@tbrowang.fr>             +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/07/18 20:14:42 by tbrowang          #+#    #+#             */
/*   Updated: 2021/07/18 20:14:56 by tbrowang         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

int	ft_isspace(char c)
{
	if ((c >= '\t' && c <= '\r') || c == ' ')
		return (1);
	return (0);
}

int	ft_atoi(const char *str)
{
	int	nb;
	int	i;
	int	min;

	nb = 0;
	i = 0;
	min = 0;
	while (str[i] == ' ')
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			min++;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9')
	{
		nb = nb * 10 + str[i] - '0';
		i++;
	}
	if (min > 0)
		nb = nb * -1;
	return (nb);
}