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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
coreutil.c
Miscellaneous utility code
***************************************************************************/
#include "coreutil.h"
/***************************************************************************
BINARY CODED DECIMAL HELPERS
***************************************************************************/
int bcd_adjust(int value)
{
if ((value & 0xf) >= 0xa)
value = value + 0x10 - 0xa;
if ((value & 0xf0) >= 0xa0)
value = value - 0xa0 + 0x100;
return value;
}
UINT32 dec_2_bcd(UINT32 a)
{
UINT32 result = 0;
int shift = 0;
while (a != 0)
{
result |= (a % 10) << shift;
a /= 10;
shift += 4;
}
return result;
}
UINT32 bcd_2_dec(UINT32 a)
{
UINT32 result = 0;
UINT32 scale = 1;
while (a != 0)
{
result += (a & 0x0f) * scale;
a >>= 4;
scale *= 10;
}
return result;
}
/***************************************************************************
GREGORIAN CALENDAR HELPERS
***************************************************************************/
int gregorian_is_leap_year(int year)
{
return !((year % 100) ? (year % 4) : (year % 400));
}
/* months are one counted */
int gregorian_days_in_month(int month, int year)
{
if (month == 2)
return gregorian_is_leap_year(year) ? 29 : 28;
else if (month == 4 || month == 6 || month == 9 || month == 11)
return 30;
else
return 31;
}
/***************************************************************************
MISC
***************************************************************************/
void rand_memory(void *memory, size_t length)
{
static UINT32 seed = 0;
UINT8 *bytes = (UINT8 *) memory;
size_t i;
for (i = 0; i < length; i++)
{
seed = seed * 214013 + 2531011;
bytes[i] = (UINT8) (seed >> 16);
}
}
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