/*
* 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