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skrzyp |
//=================================================================
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//
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// rand4.c
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//
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// Testcase for C library rand()
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//
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//=================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//=================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): rosalia
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// Contributors: jlarmour
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// Date: 2000-04-30
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// Description: Contains testcode for C library rand() function. This tests
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// that random numbers do not have periodicity in the lower
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// bit
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//
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//
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//####DESCRIPTIONEND####
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// CONFIGURATION
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#include <pkgconf/system.h>
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#include <pkgconf/libc_stdlib.h> // Configuration header
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// INCLUDES
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#include <stdlib.h>
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#include <cyg/infra/testcase.h>
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// CONSTANTS
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#define TEST_LENGTH 100000 // how many samples to take
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// DEFINES
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#define TEST_VALID (!defined(CYGIMP_LIBC_RAND_SIMPLEST))
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// FUNCTIONS
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#ifndef CYGPKG_LIBC_STARTUP
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void cyg_user_start(void)
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#else
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int
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main( int argc, char *argv[] )
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#endif
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{
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#if TEST_VALID
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int i;
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int r, prev, prevprev;
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int how_many_periodics = 0;
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#endif
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CYG_TEST_INIT();
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CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library "
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"rand() function");
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CYG_TEST_INFO("This test tests the distribution of random numbers and");
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CYG_TEST_INFO("may take some time");
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#if TEST_VALID
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r = rand() % 2;
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prev = r;
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r = rand() % 2;
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for (i = 0; i < TEST_LENGTH; ++i) {
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prevprev = prev;
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prev = r;
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r = rand() % 2;
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if (r == prevprev) {
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++how_many_periodics;
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}
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if (how_many_periodics > (2*TEST_LENGTH)/3) {
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break;
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}
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}
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CYG_TEST_PASS_FAIL( (how_many_periodics <= (2*TEST_LENGTH)/3),
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"periodicity of rand() in lowest bit");
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#else
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// TODO: should be an _expected_ fail i.e. XFAIL
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CYG_TEST_NA("Chosen rand algorithm is known to fail this test");
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#endif
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CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for "
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"C library rand() function");
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} // main()
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// EOF rand4.c
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