Mercurial > ecos
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 |
| parents | |
| children | e0c0827131d1 |
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new file mode 100644 --- /dev/null +++ b/packages/language/c/libc/stdlib/current/tests/srand.c @@ -0,0 +1,121 @@ +//================================================================= +// +// 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
