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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
coreutil.h
Miscellaneous utility code
***************************************************************************/
#ifndef MAME_UTIL_COREUTIL_H
#define MAME_UTIL_COREUTIL_H
#pragma once
#include <cstdint>
/***************************************************************************
BINARY CODED DECIMAL HELPERS
***************************************************************************/
int bcd_adjust(int value);
uint32_t dec_2_bcd(uint32_t a);
uint32_t bcd_2_dec(uint32_t a);
/***************************************************************************
GREGORIAN CALENDAR HELPERS
***************************************************************************/
constexpr bool gregorian_is_leap_year(int year)
{
return !((year % 100) ? (year % 4) : (year % 400));
}
//-------------------------------------------------
// gregorian_days_in_month - given a year and a one-counted
// month, return the amount of days in that month
//-------------------------------------------------
inline int gregorian_days_in_month(int month, int year)
{
int result;
switch (month)
{
case 4: case 6:
case 9: case 11:
// Thirty days have September, April, June, and November.
result = 30;
break;
case 1: case 3:
case 5: case 7:
case 8: case 10:
case 12:
// All the rest have Thirty One
result = 31;
break;
case 2:
// No exceptions, but save one: Twenty Eight hath February
// in fine, and each leap year Twenty Nine
result = gregorian_is_leap_year(year) ? 29 : 28;
break;
default:
throw false;
}
return result;
}
#endif // MAME_UTIL_COREUTIL_H
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