rand1.c

eCos操作系统源码

//=================================================================
//
//        rand1.c
//
//        Testcase for C library rand()
//
//=================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
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//####ECOSGPLCOPYRIGHTEND####
//=================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     ctarpy, jlarmour
// Contributors:  
// Date:          2000-04-30
// Description:   Contains testcode for C library rand() function
//
//
//####DESCRIPTIONEND####

// INCLUDES

#include <stdlib.h>
#include <cyg/infra/testcase.h>

// CONSTANTS

// This is the max allowable hits, where a hit is an element
// of a random array being the same as index+1 or index+2
#define TOLERANCE 2

// FUNCTIONS

static void
test( CYG_ADDRWORD data )
{
    int ctr;
    static int array[1024];
    int hits=0;

    for (ctr=0; ctr<1024; ctr++)
        array[ctr] = rand();

    for (ctr=0; ctr< 1021; ctr++)
        if ((array[ctr]==array[ctr+1]) ||
            (array[ctr]==array[ctr+2]) ||
            (array[ctr]==array[ctr+3]))
            hits++;
    
    CYG_TEST_PASS_FAIL(hits <= TOLERANCE,
                       "Simple test for rand() repetition");

    CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for "
                    "C library rand() function");
} // test()

int
main(int argc, char *argv[])
{
    CYG_TEST_INIT();

    CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library "
                  "rand() function");

    test(0);

    CYG_TEST_NA("Testing is not applicable to this configuration");
} // main()

// EOF rand1.c