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annotate packages/language/c/libc/stdlib/current/tests/srand.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 6ed91473a1cd
children d2c90368aeef
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1 //=================================================================
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2 //
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3 // srand.c
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4 //
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5 // Testcase for C library srand()
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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
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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): ctarpy, jlarmour
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44 // Contributors:
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45 // Date: 2000-04-30
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46 // Description: Contains testcode for C library srand() function
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47 //
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48 //
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49 //####DESCRIPTIONEND####
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50
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51 // INCLUDES
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52
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53 #include <stdlib.h>
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54 #include <cyg/infra/testcase.h>
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55
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56
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57 // CONSTANTS
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58
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59 // Max cross correlation value of two sequences of
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60 // different seed
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61 #define X_CORREL 10
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62
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63 // size of arrays to use for testing
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64 #define TEST_SIZE 1024
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65
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66
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67 // FUNCTIONS
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68
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69 static void
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70 test( CYG_ADDRWORD data )
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71 {
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72 int ctr;
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73 static int array_1[TEST_SIZE];
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74 static int array_2[TEST_SIZE];
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75 static int array_3[TEST_SIZE];
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76 int hits;
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77 int fail;
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78
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79
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80 srand(3);
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81 for (ctr=0; ctr<TEST_SIZE; ++ctr)
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82 array_1[ctr] = rand();
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83
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84 srand(9);
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85 for (ctr=0; ctr<TEST_SIZE; ++ctr)
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86 array_2[ctr] = rand();
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87
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88 srand(3);
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89 for (ctr=0; ctr<TEST_SIZE; ++ctr)
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90 array_3[ctr] = rand();
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91
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92 // Make sure arrays 1 and 3 are the same
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93 fail = 0;
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94 for (ctr=0; ctr<TEST_SIZE; ++ctr) {
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95 if (array_1[ctr] != array_3[ctr])
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96 ++fail;
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97 } // for
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98
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99 CYG_TEST_PASS_FAIL( fail == 0, "resetting the seed to the same value");
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100
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101 // Check sequences of different seeds are different
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102 hits = 0;
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103 for (ctr=0; ctr<TEST_SIZE; ++ctr) {
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104 if (array_1[ctr] == array_2[ctr])
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105 ++hits;
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106 } // for
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107
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108 CYG_TEST_PASS_FAIL(hits < X_CORREL,
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109 "random sequence for different seeds is different");
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110
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111 CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for "
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112 "C library srand() function");
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113 } // test()
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114
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115 int
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116 main(int argc, char *argv[])
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117 {
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118 CYG_TEST_INIT();
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119
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120 CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library "
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121 "srand() function");
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122
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123 test(0);
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124
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125 CYG_TEST_NA("Testing is not applicable to this configuration");
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126 } // main()
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127
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128
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129
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130 // EOF srand.c