/*

 * Copyright (c) 2020 Red Hat, Inc.

 *

 * 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. 

 *

 * $Id: //eng/uds-releases/jasper/src/uds/random.c#2 $

 */

#include "random.h"

#include "permassert.h"

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

unsigned int randomInRange(unsigned int lo, unsigned int hi)

{

  return lo + random() % (hi - lo + 1);

}

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

void randomCompileTimeAssertions(void)

{

  STATIC_ASSERT((((uint64_t) RAND_MAX + 1) & RAND_MAX) == 0);

}

#ifndef __KERNEL__

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

void fillRandomly(void *ptr, size_t len)

{

  uint64_t randNum  = 0;

  uint64_t randMask = 0;

  const uint64_t multiplier = (uint64_t) RAND_MAX + 1;

  byte *bp = ptr;

  for (size_t i = 0; i < len; ++i) {

    if (randMask < 0xff) {

      randNum  = randNum * multiplier + random();

      randMask = randMask * multiplier + RAND_MAX;

    }

    bp[i] = randNum & 0xff;

    randNum >>= 8;

    randMask >>= 8;

  }

}

#endif