From 013ac7742311556022304e8b30ca170d48b3a016 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Thu, 7 May 2015 16:32:32 -0400
Subject: initial commit

---
 dab/random.cc | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 dab/random.cc

(limited to 'dab/random.cc')

diff --git a/dab/random.cc b/dab/random.cc
new file mode 100644
index 0000000..2204c45
--- /dev/null
+++ b/dab/random.cc
@@ -0,0 +1,79 @@
+/*	$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;
+	}
+    }
+}
-- 
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