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annotate packages/language/c/libc/stdlib/current/tests/rand4.c @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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1 //=================================================================
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2 //
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3 // rand4.c
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4 //
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5 // Testcase for C library rand()
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6 //
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7 //=================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //=================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): rosalia
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35 // Contributors: jlarmour
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36 // Date: 2000-04-30
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37 // Description: Contains testcode for C library rand() function. This tests
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38 // that random numbers do not have periodicity in the lower
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39 // bit
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40 //
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41 //
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42 //####DESCRIPTIONEND####
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43
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44 // CONFIGURATION
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45
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46 #include <pkgconf/libc_stdlib.h> // Configuration header
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47
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48 // INCLUDES
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49
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50 #include <stdlib.h>
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51 #include <cyg/infra/testcase.h>
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52
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53 // CONSTANTS
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54
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55 #define TEST_LENGTH 100000 // how many samples to take
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56
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57 // DEFINES
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58
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59 #define TEST_VALID (!defined(CYGIMP_LIBC_RAND_SIMPLEST))
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60
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61 // FUNCTIONS
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62
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63 int
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64 main(int argc, char *argv[])
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65 {
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66 #if TEST_VALID
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67 int i;
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68 int r, prev, prevprev;
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69 int how_many_periodics = 0;
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70 #endif
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71
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72 CYG_TEST_INIT();
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73
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74 CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library "
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75 "rand() function");
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76
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77 CYG_TEST_INFO("This test tests the distribution of random numbers and");
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78 CYG_TEST_INFO("may take some time");
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79
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80 #if TEST_VALID
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81 r = rand() % 2;
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82 prev = r;
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83 r = rand() % 2;
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84 for (i = 0; i < TEST_LENGTH; ++i) {
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85 prevprev = prev;
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86 prev = r;
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87 r = rand() % 2;
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88 if (r == prevprev) {
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89 ++how_many_periodics;
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90 }
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91 if (how_many_periodics > (2*TEST_LENGTH)/3) {
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92 break;
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93 }
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94 }
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95
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96 CYG_TEST_PASS_FAIL( (how_many_periodics <= (2*TEST_LENGTH)/3),
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97 "periodicity of rand() in lowest bit");
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98
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99 #else
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100
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101 // TODO: should be an _expected_ fail i.e. XFAIL
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102 CYG_TEST_NA("Chosen rand algorithm is known to fail this test");
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103
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104 #endif
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105
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106 CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for "
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107 "C library rand() function");
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108 } // main()
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109
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110
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111 // EOF rand4.c