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annotate packages/language/c/libc/stdlib/current/tests/rand4.c @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +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 //=================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
115
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40 //=================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): rosalia
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44 // Contributors: jlarmour
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45 // Date: 2000-04-30
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46 // Description: Contains testcode for C library rand() function. This tests
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47 // that random numbers do not have periodicity in the lower
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48 // bit
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49 //
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50 //
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51 //####DESCRIPTIONEND####
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52
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53 // CONFIGURATION
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54
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55 #include <pkgconf/libc_stdlib.h> // Configuration header
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56
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57 // INCLUDES
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58
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59 #include <stdlib.h>
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60 #include <cyg/infra/testcase.h>
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61
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62 // CONSTANTS
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63
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64 #define TEST_LENGTH 100000 // how many samples to take
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65
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66 // DEFINES
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67
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68 #define TEST_VALID (!defined(CYGIMP_LIBC_RAND_SIMPLEST))
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69
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70 // FUNCTIONS
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71
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72 int
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73 main(int argc, char *argv[])
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74 {
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75 #if TEST_VALID
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76 int i;
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77 int r, prev, prevprev;
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78 int how_many_periodics = 0;
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79 #endif
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80
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81 CYG_TEST_INIT();
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82
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83 CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library "
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84 "rand() function");
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85
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86 CYG_TEST_INFO("This test tests the distribution of random numbers and");
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87 CYG_TEST_INFO("may take some time");
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88
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89 #if TEST_VALID
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90 r = rand() % 2;
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91 prev = r;
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92 r = rand() % 2;
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93 for (i = 0; i < TEST_LENGTH; ++i) {
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94 prevprev = prev;
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95 prev = r;
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96 r = rand() % 2;
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97 if (r == prevprev) {
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98 ++how_many_periodics;
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99 }
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100 if (how_many_periodics > (2*TEST_LENGTH)/3) {
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101 break;
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102 }
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103 }
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104
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105 CYG_TEST_PASS_FAIL( (how_many_periodics <= (2*TEST_LENGTH)/3),
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106 "periodicity of rand() in lowest bit");
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107
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108 #else
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109
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110 // TODO: should be an _expected_ fail i.e. XFAIL
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111 CYG_TEST_NA("Chosen rand algorithm is known to fail this test");
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112
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113 #endif
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114
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115 CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for "
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116 "C library rand() function");
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117 } // main()
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118
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119
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120 // EOF rand4.c