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Patric Stout

Fix #9281: acquire a company uses special bookkeeping to make you rich (#9300)

When you buy-out a company, you got your shares back. This is
based on company-value, which includes values for the vehicles etc.
In other words, you not only got the vehicles, but you also got
paid to get them back.

Additionally, you also got the loan of the company, but not the
money for the loan (as that is subtracted from the company-value).

Solve this by changing the rules of a buy-out: don't sell your
shares, get the loan AND the balance and get the infrastructure.

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file date_func.h Functions related to dates. */

#ifndef DATE_FUNC_H
#define DATE_FUNC_H

#include "date_type.h"

extern Year      _cur_year;
extern Month     _cur_month;
extern Date      _date;
extern DateFract _date_fract;
extern uint16 _tick_counter;

void SetDate(Date date, DateFract fract);
void ConvertDateToYMD(Date date, YearMonthDay *ymd);
Date ConvertYMDToDate(Year year, Month month, Day day);

/**
 * Checks whether the given year is a leap year or not.
 * @param yr The year to check.
 * @return True if \c yr is a leap year, otherwise false.
 */
static inline bool IsLeapYear(Year yr)
{
	return yr % 4 == 0 && (yr % 100 != 0 || yr % 400 == 0);
}

#endif /* DATE_FUNC_H */