X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstdlib%2Frand.c;h=1e8f3cd789b2542ba0e7ab78c969cb412ff325c7;hp=0821fe402834b342cf09af3b7ea001d4be0c40ed;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec

diff --git a/functions/stdlib/rand.c b/functions/stdlib/rand.c
index 0821fe4..1e8f3cd 100644
--- a/functions/stdlib/rand.c
+++ b/functions/stdlib/rand.c
@@ -1,9 +1,33 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// 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 */ };
+/* 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