From: MaartenBrock <MaartenBrock@4a8a32a2-be11-0410-ad9d-d568d2c75423>
Date: Tue, 26 Sep 2006 09:05:07 +0000 (+0000)
Subject: * device/include/stdlib.h: added rand prototypes
X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=d49ef705a2aa2ff92120fa9ab49f5f341d0eed4d;p=fw%2Fsdcc

* device/include/stdlib.h: added rand prototypes
* device/lib/rand.c: new, added

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4384 4a8a32a2-be11-0410-ad9d-d568d2c75423
---

diff --git a/ChangeLog b/ChangeLog
index 2fe21a4b..8a35160e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2006-09-26 Maarten Brock <sourceforge.brock AT dse.nl>
+
+	* device/include/stdlib.h: added rand prototypes
+	* device/lib/rand.c: new, added
+
 2006-09-20 Raphael Neider <rneider AT web.de>
 
 	* device/lib/pic16/libio/i2c/i2cnack.c (i2c_nack): fixed ACKDT bit
diff --git a/device/include/stdlib.h b/device/include/stdlib.h
index 27328370..1e3dbeb8 100644
--- a/device/include/stdlib.h
+++ b/device/include/stdlib.h
@@ -43,4 +43,9 @@ extern void _itoa(unsigned int, char*, unsigned char);
 
 extern void _ultoa(unsigned long, char*, unsigned char);
 extern void _ltoa(unsigned long, char*, unsigned char);
+
+#define RAND_MAX 32767
+
+int rand(void);
+void srand(unsigned int seed);
 #endif
diff --git a/device/lib/rand.c b/device/lib/rand.c
new file mode 100644
index 00000000..01c9f2c5
--- /dev/null
+++ b/device/lib/rand.c
@@ -0,0 +1,38 @@
+/*-------------------------------------------------------------------------
+   rand.c - random number generator
+
+   Written By - Maarten Brock, sourceforge.brock@dse.nl (2006)
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+
+   In other words, you are welcome to use, share and improve this program.
+   You are forbidden to forbid anyone else to use, share and improve
+   what you give them.   Help stamp out software-hoarding!
+-------------------------------------------------------------------------*/
+
+#include <stdlib.h>
+
+static unsigned long int next = 1;
+
+int rand(void)
+{
+    next = next * 1103515245UL + 12345;
+    return (unsigned int)(next/65536) % (RAND_MAX + 1);
+}
+
+void srand(unsigned int seed)
+{
+    next = seed;
+}