From 13a3029435b77ed61dc60ad4c7efd6965d634696 Mon Sep 17 00:00:00 2001
From: adamdunkels <adamdunkels>
Date: Wed, 11 Feb 2009 11:09:59 +0000
Subject: [PATCH] Rewrote the random_rand() pseudo random number generator to
 use the libc rand() function instead

---
 core/lib/rand.h   |  6 ++++--
 core/lib/random.c | 35 +++++++----------------------------
 2 files changed, 11 insertions(+), 30 deletions(-)

diff --git a/core/lib/rand.h b/core/lib/rand.h
index bc8344312..a543f0738 100644
--- a/core/lib/rand.h
+++ b/core/lib/rand.h
@@ -28,14 +28,16 @@
  *
  * This file is part of the Contiki operating system.
  *
- * @(#)$Id: rand.h,v 1.4 2007/09/04 08:48:54 bg- Exp $
+ * @(#)$Id: rand.h,v 1.5 2009/02/11 11:09:59 adamdunkels Exp $
  */
 /* -*- C -*- */
-/* @(#)$Id: rand.h,v 1.4 2007/09/04 08:48:54 bg- Exp $ */
+/* @(#)$Id: rand.h,v 1.5 2009/02/11 11:09:59 adamdunkels Exp $ */
 
 #ifndef RAND_H
 #define RAND_H
 
+#include "sys/cc.h"
+
 #undef RAND_MAX
 #define RAND_MAX 0x7fff
 
diff --git a/core/lib/random.c b/core/lib/random.c
index 814e7ba1b..8d48107b3 100644
--- a/core/lib/random.c
+++ b/core/lib/random.c
@@ -28,45 +28,24 @@
  *
  * This file is part of the Contiki operating system.
  *
- * @(#)$Id: random.c,v 1.2 2008/02/10 12:30:57 oliverschmidt Exp $
+ * @(#)$Id: random.c,v 1.3 2009/02/11 11:09:59 adamdunkels Exp $
  */
 
-/*
-  From:
-  
-   D. Seetharam and S. Rhee, ``An Efficient Random Number Generator
-   for Low-Power Sensor Networks'' First IEEE Workshop on Embedded
-   Networked Sensors (EmNets-I), November 2004.
-   
-   http://www.dseetharam.org/papers/emnets.pdf
-*/
 
 #include "lib/random.h"
+#include "lib/rand.h"
 #include "sys/clock.h"
 
-static clock_time_t time;
-
-static unsigned short key;
-
+/*---------------------------------------------------------------------------*/
 void
 random_init(unsigned short seed)
 {
-  key = seed;
+  srand(seed);
 }
-
+/*---------------------------------------------------------------------------*/
 unsigned short
 random_rand(void)
 {
-  unsigned short rv, tv;
-
-  rv = tv = 0;
-
-  tv = (unsigned short)(time + clock_time());
-  rv = tv ^ key;
-
-  key = ~tv + 4711;
-  tv = ~rv;
-  time = tv;
-  
-  return rv;
+  return (unsigned short)rand();
 }
+/*---------------------------------------------------------------------------*/