utils_number.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   utils_number.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: khlavaty <khlavaty@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/03/06 21:12:02 by fvonsovs          #+#    #+#             */
/*   Updated: 2024/09/12 21:06:17 by khlavaty         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "minirt.h"

// converts string to float by iterating until we find decimal
// after that divide by 10 and calculate fraction
float	str_to_float(char *str)
{
	float	sum;
	float	frac;
	float	div;
	float	sign;

	frac = 0.0;
	div = 1.0;
	sign = 1.0;
	if (str && str[0] == '-')
		sign *= -1.0;
	sum = (float)ft_atoi(str);
	while (*str && *str != '.')
		str++;
	if (*str++ == '.')
	{
		while (*str >= '0' && *str <= '9')
		{
			div *= 10.0;
			frac += (*str - '0') / div;
			str++;
		}
		sum += frac * sign;
	}
	return (sum);
}

int	str_to_int_color(char *str)
{
	int	c;

	c = ft_atoi(str);
	if (c < 0)
		return (0);
	if (c > 255)
		return (255);
	return (c);
}

int	is_float(char *str)
{
	int	i;

	i = 0;
	while (str[i] && str[i])
	{
		if (ft_isdigit(str[i]) != 1 && str[i] != '-' && str[i] != '.')
			return (0);
		i++;
	}
	return (1);
}

int	is_ulong(char *str)
{
	int	i;

	i = 0;
	while (str[i] && str[i])
	{
		if (ft_isdigit(str[i]) != 1)
			return (0);
		i++;
	}
	return (1);
}