utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   utils.c                                            :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: vsimeono <vsimeono@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/01/23 16:01:25 by vsimeono          #+#    #+#             */
/*   Updated: 2022/02/23 15:08:51 by vsimeono         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "push_swap.h"

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

	i = 0;
	sign = 1;
	num = 0;
	while ((*(str + i) >= 9 && *(str + i) <= 13) || (*(str + i) == ' '))
	{
		i++;
	}
	if (*(str + i) == '-' || *(str + i) == '+')
	{
		if (*(str + i) == '-')
		{
			sign = sign * (-1);
		}
		i++;
	}
	while ((*(str + i) >= 48 && *(str + i) <= 57))
	{
		num = (num * 10) + (*(str + i) - '0');
		i++;
	}
	return (num * sign);
}

void	ft_lstadd_back(t_stack **lst, t_stack *new)
{
	t_stack	*temp;

	temp = *lst;
	if (*lst)
	{
		while (temp->next != NULL)
			temp = temp->next;
		temp->next = new;
	}
	else
		*lst = new;
}

int	ft_isdigit(int c)
{
	if (c >= '0' && c <= '9')
		return (1);
	return (0);
}

int	len_stack(t_stack **stack)
{
	t_stack	*temp;
	int		counter;

	temp = *stack;
	counter = 0;
	if (*stack != NULL)
	{
		counter = 1;
		while (temp->next != NULL)
		{
			temp = temp->next;
			counter++;
		}
	}
	return (counter);
}