Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 Zabbix SIA

**

** This program 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; either version 2 of the License, or

** (at your option) any later version.

**

** This program 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 this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

#include "zbxalgo.h"

​

#define UINT64_BIT_COUNT    (sizeof(zbx_uint64_t) << 3)

#define UINT32_BIT_COUNT    (UINT64_BIT_COUNT >> 1)

#define UINT32_BIT_MASK     (~((~__UINT64_C(0)) << UINT32_BIT_COUNT))

​

/******************************************************************************

 *                                                                            *

 * Purpose: Decrement of 128 bit unsigned integer by the specified value.     *

 *                                                                            *

 * Parameters: base  - [IN/OUT] integer to decrement                          *

 *             value - [IN] value to decrement by                             *

 *                                                                            *

 ******************************************************************************/

static void udec128_128(zbx_uint128_t *base, const zbx_uint128_t *value)

{

    zbx_uint64_t    lo = base->lo;

​

    base->lo -= value->lo;

    if (lo < base->lo)

        base->hi--;

    base->hi -= value->hi;

}

​

/******************************************************************************

 *                                                                            *

 * Purpose: Logical right shift of 128 bit unsigned integer.                  *

 *                                                                            *

 * Parameters: base - [IN/OUT] initial value and result                       *

 *             bits - [IN] number of bits to shift for                        *

 *                                                                            *

 ******************************************************************************/

static void ushiftr128(zbx_uint128_t *base, unsigned int bits)

{

    if (0 == bits)

        return;

​

    if (UINT64_BIT_COUNT <= bits)

    {

        bits -= UINT64_BIT_COUNT;

        base->lo = base->hi >> bits;

        base->hi = 0;

        return;

    }