Subversion Repositories openrisc_me

//=================================================================

//

//        srand.c

//

//        Testcase for C library srand()

//

//=================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//=================================================================

//#####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