diff packages/language/c/libc/stdlib/current/tests/srand.c @ 115:6ed91473a1cd ecos-sw-2000-08-21

Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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+//=================================================================
+//
+//        srand.c
+//
+//        Testcase for C library srand()
+//
+//=================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//=================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):     ctarpy, jlarmour
+// Contributors:  
+// Date:          2000-04-30
+// Description:   Contains testcode for C library srand() function
+//
+//
+//####DESCRIPTIONEND####
+
+// INCLUDES
+
+#include <stdlib.h>
+#include <cyg/infra/testcase.h>
+
+
+// CONSTANTS
+
+// Max cross correlation value of two sequences of
+// different seed
+#define X_CORREL 10
+
+// size of arrays to use for testing
+#define TEST_SIZE 1024
+
+
+// FUNCTIONS
+
+static void
+test( CYG_ADDRWORD data )
+{
+    int ctr;
+    static int array_1[TEST_SIZE];
+    static int array_2[TEST_SIZE];
+    static int array_3[TEST_SIZE];
+    int hits;
+    int fail;
+
+
+    srand(3);
+    for (ctr=0; ctr<TEST_SIZE; ++ctr)
+        array_1[ctr] = rand();
+
+    srand(9);
+    for (ctr=0; ctr<TEST_SIZE; ++ctr)
+        array_2[ctr] = rand();
+
+    srand(3);
+    for (ctr=0; ctr<TEST_SIZE; ++ctr)
+        array_3[ctr] = rand();
+
+    // Make sure arrays 1 and 3 are the same
+    fail = 0;
+    for (ctr=0; ctr<TEST_SIZE; ++ctr) {
+        if (array_1[ctr] != array_3[ctr])
+            ++fail;
+    } // for
+
+    CYG_TEST_PASS_FAIL( fail == 0, "resetting the seed to the same value");
+
+    // Check sequences of different seeds are different
+    hits = 0;
+    for (ctr=0; ctr<TEST_SIZE; ++ctr) {
+        if (array_1[ctr] == array_2[ctr])
+            ++hits;
+    } // for
+
+    CYG_TEST_PASS_FAIL(hits < X_CORREL,
+                       "random sequence for different seeds is different");
+
+    CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for "
+                    "C library srand() function");
+} // test()
+
+int
+main(int argc, char *argv[])
+{
+    CYG_TEST_INIT();
+
+    CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library "
+                  "srand() function");
+
+    test(0);
+
+    CYG_TEST_NA("Testing is not applicable to this configuration");
+} // main()
+
+
+
+// EOF srand.c