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

//

//        srand.c

//

//        Testcase for C library srand()

//

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

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

//#####DESCRIPTIONBEGIN####

//

// Author(s):     ctarpy, jlarmour

// Contributors:  

// Date:          2000-04-30

// Description:   Contains testcode for C library srand() function

//

//

//####DESCRIPTIONEND####

// INCLUDES

#include <pkgconf/system.h>

#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()

#ifndef CYGPKG_LIBC_STARTUP

void cyg_user_start(void)

#else

int

main( int argc, char *argv[] )

#endif

{

    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