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AbsRndNumGenerator.cpp
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AbsRndNumGenerator.cpp
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// -*- mode: C++ -*-
//
// Copyright (c) 2007, 2008, 2009, 2010, 2011, 2015, 2017 The University of Utah
// All rights reserved.
//
// This file is part of `csmith', a random generator of C programs.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include "AbsRndNumGenerator.h"
#include <cassert>
#include <cstdlib>
#include <iostream>
#include "DefaultRndNumGenerator.h"
#include "DFSRndNumGenerator.h"
#include "SimpleDeltaRndNumGenerator.h"
using namespace std;
#ifndef HAVE_LRAND48
extern "C" {
extern void srand48(long seed);
extern long lrand48(void);
}
#endif
const char *AbsRndNumGenerator::hex1 = "0123456789ABCDEF";
const char *AbsRndNumGenerator::dec1 = "0123456789";
AbsRndNumGenerator::AbsRndNumGenerator()
{
//Nothing to do
}
AbsRndNumGenerator::~AbsRndNumGenerator()
{
//Nothing to do
}
/*
* Factory method to create random number generators.
*/
AbsRndNumGenerator*
AbsRndNumGenerator::make_rndnum_generator(RNDNUM_GENERATOR impl, const unsigned long seed)
{
AbsRndNumGenerator *rImpl = 0;
AbsRndNumGenerator::seedrand(seed);
switch (impl) {
case rDefaultRndNumGenerator:
rImpl = DefaultRndNumGenerator::make_rndnum_generator(seed);
break;
case rDFSRndNumGenerator:
rImpl = DFSRndNumGenerator::make_rndnum_generator();
break;
case rSimpleDeltaRndNumGenerator:
rImpl = SimpleDeltaRndNumGenerator::make_rndnum_generator(seed);
break;
default:
assert(!"unknown random generator");
break;
}
return rImpl;
}
void
AbsRndNumGenerator::seedrand(const unsigned long seed )
{
#ifdef HAVE_SRAND48_DETERMINISTIC
// OpenBSD requires a special call to activate the standard,
// deterministic behavior of `lrand48'.
srand48_deterministic(seed);
#else
srand48(seed);
#endif
}
/*
* Return random shuffled integers in set [0...n]
* Note: deprecated.
*/
#if 0
unsigned int*
AbsRndNumGenerator::rnd_shuffle(unsigned int n)
{
unsigned int* ary = new unsigned int[n];
unsigned int i = 0;
unsigned int tmp;
for (i = 0; i < n; i++) {
ary[i] = i;
}
for (i = 0; i < n; i++) {
unsigned int j = rnd_upto(i);
tmp = ary[j];
ary[j] = ary[i];
ary[i] = tmp;
}
return ary;
}
#endif
unsigned long
AbsRndNumGenerator::genrand(void)
{
return lrand48();
}
std::string
AbsRndNumGenerator::RandomHexDigits( int num )
{
std::string str;
while ( num-- )
{
str += hex1[genrand()%16];
}
return str;
}
std::string
AbsRndNumGenerator::RandomDigits( int num )
{
std::string str;
while ( num-- )
{
str += dec1[genrand()%10];
}
return str;
}
const char *
AbsRndNumGenerator::get_hex1()
{
return AbsRndNumGenerator::hex1;
}
const char *
AbsRndNumGenerator::get_dec1()
{
return AbsRndNumGenerator::dec1;
}