80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/* $NetBSD: random.cc,v 1.3 2008/04/28 20:22:54 martin Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2003 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Christos Zoulas.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
/*
|
|
* random.C: Randomizer for the dots program
|
|
*/
|
|
|
|
#include "defs.h"
|
|
RCSID("$NetBSD: random.cc,v 1.3 2008/04/28 20:22:54 martin Exp $")
|
|
|
|
#include <time.h>
|
|
#include <string.h>
|
|
#include "random.h"
|
|
|
|
RANDOM::RANDOM(size_t ns) :
|
|
_bs(ns)
|
|
{
|
|
_bm = new char[(_bs >> 3) + 1];
|
|
clear();
|
|
}
|
|
|
|
RANDOM::~RANDOM()
|
|
{
|
|
delete[] _bm;
|
|
}
|
|
|
|
// Reinitialize
|
|
void RANDOM::clear(void)
|
|
{
|
|
_nv = 0;
|
|
::srand48(::time(NULL));
|
|
(void) ::memset(_bm, 0, (_bs >> 3) + 1);
|
|
}
|
|
|
|
// Return the next random value
|
|
size_t RANDOM::operator() (void)
|
|
{
|
|
// No more values
|
|
if (_nv == _bs)
|
|
return _bs;
|
|
|
|
for (;;) {
|
|
size_t r = ::lrand48();
|
|
size_t z = r % _bs;
|
|
if (!isset(z)) {
|
|
set(z);
|
|
_nv++;
|
|
return z;
|
|
}
|
|
}
|
|
}
|