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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 //================================================================= |
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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 Cygnus eCos Public License |
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12 // Version 1.0 (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://sourceware.cygnus.com/ecos |
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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 Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //================================================================= |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): ctarpy@cygnus.co.uk, jlarmour@cygnus.co.uk |
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33 // Contributors: jlarmour@cygnus.co.uk |
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34 // Date: 1998/6/3 |
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35 // Description: Contains testcode for C library srand() function |
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36 // |
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37 // |
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38 //####DESCRIPTIONEND#### |
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39 |
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40 // Declarations for test system: |
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41 // |
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42 // TESTCASE_TYPE=CYG_TEST_MODULE |
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43 |
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44 // CONFIGURATION |
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45 |
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46 #include <pkgconf/libc.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 #include <sys/cstartup.h> // C library initialisation |
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53 |
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54 |
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55 // HOW TO START TESTS |
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56 |
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57 #if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_RAND) |
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58 |
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59 # define START_TEST( test ) test(0) |
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60 |
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61 #else |
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62 |
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63 # define START_TEST( test ) CYG_EMPTY_STATEMENT |
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64 |
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65 #endif // if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_RAND) |
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66 |
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67 |
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68 // CONSTANTS |
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69 |
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70 // Max cross correlation value of two sequences of |
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71 // different seed |
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72 #define X_CORREL 10 |
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73 |
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74 // size of arrays to use for testing |
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75 #define TEST_SIZE 1024 |
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76 |
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77 |
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78 // FUNCTIONS |
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79 |
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80 externC void |
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81 cyg_package_start( void ) |
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82 { |
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83 #ifdef CYGPKG_LIBC |
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84 cyg_iso_c_start(); |
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85 #else |
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86 (void)main(0, NULL); |
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87 #endif |
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88 } // cyg_package_start() |
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89 |
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90 |
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91 #if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_RAND) |
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92 |
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93 static void |
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94 test( CYG_ADDRWORD data ) |
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95 { |
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96 int ctr; |
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97 static int array_1[TEST_SIZE]; |
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98 static int array_2[TEST_SIZE]; |
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99 static int array_3[TEST_SIZE]; |
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100 int hits; |
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101 int fail; |
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102 |
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103 |
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104 srand(3); |
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105 for (ctr=0; ctr<TEST_SIZE; ++ctr) |
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106 array_1[ctr] = rand(); |
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107 |
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108 srand(9); |
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109 for (ctr=0; ctr<TEST_SIZE; ++ctr) |
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110 array_2[ctr] = rand(); |
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111 |
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112 srand(3); |
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113 for (ctr=0; ctr<TEST_SIZE; ++ctr) |
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114 array_3[ctr] = rand(); |
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115 |
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116 // Make sure arrays 1 and 3 are the same |
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117 fail = 0; |
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118 for (ctr=0; ctr<TEST_SIZE; ++ctr) |
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119 { |
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120 if (array_1[ctr] != array_3[ctr]) |
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121 ++fail; |
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122 } // for |
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123 |
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124 CYG_TEST_PASS_FAIL( fail == 0, "resetting the seed to the same value"); |
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125 |
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126 // Check sequences of different seeds are different |
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127 hits = 0; |
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128 for (ctr=0; ctr<TEST_SIZE; ++ctr) |
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129 { |
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130 if (array_1[ctr] == array_2[ctr]) |
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131 ++hits; |
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132 } // for |
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133 |
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134 CYG_TEST_PASS_FAIL(hits < X_CORREL, |
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135 "random sequence for different seeds is different"); |
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136 |
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137 CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for C library " |
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138 "srand() function"); |
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139 } // test() |
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140 |
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141 #endif // if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_RAND) |
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142 |
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143 |
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144 int |
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145 main(int argc, char *argv[]) |
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146 { |
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147 CYG_TEST_INIT(); |
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148 |
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149 CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library " |
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150 "srand() function"); |
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151 |
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152 START_TEST( test ); |
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153 |
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154 CYG_TEST_PASS_FINISH("Testing is not applicable to this configuration"); |
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155 } // main() |
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156 |
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157 |
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158 |
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159 // EOF srand.c |
