-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int rand( void ) { /* TODO */ };
-void srand( unsigned int seed ) { /* TODO */ };
+/* $Id$ */
+
+/* rand( void )
+
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdlib.h>
+
+#ifndef REGTEST
+
+int rand( void )
+{
+ _PDCLIB_seed = _PDCLIB_seed * 1103515245 + 12345;
+ return (int)( _PDCLIB_seed / 65536 ) % 32768;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+ int rnd1, rnd2;
+ TESTCASE( ( rnd1 = rand() ) < RAND_MAX );
+ TESTCASE( ( rnd2 = rand() ) < RAND_MAX );
+ srand( 1 );
+ TESTCASE( rand() == rnd1 );
+ TESTCASE( rand() == rnd2 );
+ return TEST_RESULTS;
+}
+
+#endif