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111
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1 -- CXAC003.A
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2 --
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3 -- Grant of Unlimited Rights
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4 --
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5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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7 -- unlimited rights in the software and documentation contained herein.
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8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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9 -- this public release, the Government intends to confer upon all
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10 -- recipients unlimited rights equal to those held by the Government.
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11 -- These rights include rights to use, duplicate, release or disclose the
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12 -- released technical data and computer software in whole or in part, in
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13 -- any manner and for any purpose whatsoever, and to have or permit others
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14 -- to do so.
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15 --
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16 -- DISCLAIMER
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17 --
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18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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23 -- PARTICULAR PURPOSE OF SAID MATERIAL.
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24 --*
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25 --
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26 -- OBJECTIVE:
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27 -- Check that the correct exceptions are raised when improperly
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28 -- manipulating stream file objects.
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29 --
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30 -- TEST DESCRIPTION:
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31 -- This test is designed to focus on Stream_IO file manipulation
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32 -- exceptions. Several potentially common user errors are examined in
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33 -- the test:
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34 --
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35 -- A Status_Error should be raised whenever an attempt is made to perform
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36 -- an operation on a file that is closed.
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37 --
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38 -- A Status_Error should be raised when an attempt is made to open a
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39 -- stream file that is currently open.
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40 --
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41 -- A Mode_Error should be raised when attempting to read from (use the
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42 -- 'Read attribute) on an Out_File or Append_Mode file.
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43 --
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44 -- A Mode_Error should be raised when checking for End Of File on a
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45 -- file with mode Out_File or Append_Mode.
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46 --
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47 -- A Mode_Error should be raised when attempting to write to (use the
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48 -- 'Output attribute) on a file with mode In_File.
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49 --
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50 -- A Name_Error should be raised when the string provided to the Name
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51 -- parameter of an Open operation does not allow association of an
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52 -- external file.
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53 --
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54 -- APPLICABILITY CRITERIA:
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55 -- This test is applicable to all implementations capable of supporting
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56 -- external Stream_IO files.
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57 --
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58 --
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59 -- CHANGE HISTORY:
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60 -- 06 Dec 94 SAIC ACVC 2.0
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61 -- 25 Feb 97 PWB.CTA Allowed for non-support of some IO operations
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62 -- 02 Mar 01 PHL Check that Ada.Streams.Stream_IO.Stream raises
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63 -- Status_Error if the file is not open. (DR 8652/
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64 -- 0056).
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65 -- 15 Mar 01 RLB Readied for release.
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66 --!
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67
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68 with Ada.Streams.Stream_IO;
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69 with Report;
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70
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71 procedure CXAC003 is
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72
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73 Stream_File_Object : Ada.Streams.Stream_IO.File_Type;
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74 Stream_Access_Value : Ada.Streams.Stream_IO.Stream_Access;
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75 Stream_Filename : constant String :=
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76 Report.Legal_File_Name ( Nam => "CXAC003" );
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77 Incomplete : exception;
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78
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79 begin
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80
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81 Report.Test ("CXAC003", "Check that the correct exceptions are " &
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82 "raised when improperly manipulating stream " &
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83 "file objects");
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84
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85 Test_for_Stream_IO_Support:
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86 begin
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87 -- If an implementation does not support Stream_IO in a particular
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88 -- environment, the exception Use_Error or Name_Error will be raised on
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89 -- calls to various Stream_IO operations. This block statement
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90 -- encloses a call to Create, which should produce an exception in a
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91 -- non-supportive environment. These exceptions will be handled to
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92 -- produce a Not_Applicable result.
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93
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94 Ada.Streams.Stream_IO.Create (Stream_File_Object,
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95 Ada.Streams.Stream_IO.Out_File,
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96 Stream_Filename);
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97
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98 exception
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99
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100 when Ada.Streams.Stream_IO.Use_Error | Ada.Streams.Stream_IO.Name_Error =>
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101 Report.Not_Applicable
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102 ( "Files not supported - Create as Out_File for Stream_IO" );
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103 raise Incomplete;
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104
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105 end Test_for_Stream_IO_Support;
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106
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107 Operational_Test_Block:
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108 begin
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109 -- A potentially common error in a file processing environment
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110 -- is to attempt to perform an operation on a stream file that is
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111 -- not currently open. Status_Error should be raised in this case.
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112 Check_Status_Error:
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113 begin
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114 Ada.Streams.Stream_IO.Close (Stream_File_Object);
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115 -- Attempt to reset a file that is closed.
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116 Ada.Streams.Stream_IO.Reset (Stream_File_Object,
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117 Ada.Streams.Stream_IO.Out_File);
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118 Report.Failed ("Exception not raised on Reset of closed file");
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119 exception
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120 when Ada.Streams.Stream_IO.Status_Error =>
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121 null;
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122 when others =>
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123 Report.Failed ("Incorrect exception raised - 1");
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124 end Check_Status_Error;
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125
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126 -- A similar error is to use Ada.Streams.Stream_IO.Stream
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127 -- to attempt to perform an operation on a stream file that is
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128 -- not currently open. Status_Error should be raised in this case.
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129 -- (Defect Report 8652/0046, as reflected in Technical Corrigendum 1.)
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130 Check_Status_Error2:
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131 begin
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132 -- Ensure that the file is not open.
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133 if Ada.Streams.Stream_Io.Is_Open (Stream_File_Object) then
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134 Ada.Streams.Stream_Io.Close (Stream_File_Object);
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135 end if;
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136 Stream_Access_Value :=
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137 Ada.Streams.Stream_Io.Stream (Stream_File_Object);
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138 Report.Failed ("Exception not raised on Stream of closed file");
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139 exception
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140 when Ada.Streams.Stream_Io.Status_Error =>
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141 null;
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142 when others =>
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143 Report.Failed ("Incorrect exception raised - 2");
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144 end Check_Status_Error2;
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145
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146 -- Another potentially common error in a file processing environment
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147 -- is to attempt to Open a stream file that is currently open.
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148 -- Status_Error should be raised in this case.
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149 Check_Status_Error3:
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150 begin
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151 -- Ensure that the file is open.
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152 if not Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then
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153 Ada.Streams.Stream_IO.Open (Stream_File_Object,
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154 Ada.Streams.Stream_IO.In_File,
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155 Stream_Filename);
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156 end if;
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157 Ada.Streams.Stream_IO.Open (Stream_File_Object,
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158 Ada.Streams.Stream_IO.In_File,
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159 Stream_Filename);
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160 Report.Failed ("Exception not raised on Open of open file");
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161 exception
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162 when Ada.Streams.Stream_IO.Status_Error =>
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163 null;
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164 when others =>
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165 Report.Failed ("Incorrect exception raised - 3");
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166 end Check_Status_Error3;
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167
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168 -- Another example of a potential error occurring in a file
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169 -- processing environment is to attempt to use the 'Read attribute
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170 -- on a stream file that is currently in Out_File or Append_File
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171 -- mode. Mode_Error should be raised in both of these cases.
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172 Check_Mode_Error:
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173 declare
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174 Int_Var : Integer := -10;
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175 begin
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176
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177 Reset1:
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178 begin
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179 Ada.Streams.Stream_IO.Reset (Stream_File_Object,
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180 Ada.Streams.Stream_IO.Out_File);
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181 exception
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182 when Ada.Streams.Stream_IO.Use_Error =>
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183 Report.Not_Applicable
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184 ( "Reset to Out_File not supported for Stream_IO - 1" );
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185 raise Incomplete;
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186 end Reset1;
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187
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188 Stream_Access_Value :=
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189 Ada.Streams.Stream_IO.Stream (Stream_File_Object);
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190 Integer'Write (Stream_Access_Value, Int_Var);
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191
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192 -- File contains an integer value, but is of mode Out_File.
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193 Integer'Read (Stream_Access_Value, Int_Var);
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194 Report.Failed ("Exception not raised by 'Read of Out_File");
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195 exception
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196 when Incomplete =>
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197 raise;
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198 when Ada.Streams.Stream_IO.Mode_Error =>
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199 null;
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200 Try_Read:
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201 begin
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202 Reset2:
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203 begin
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204 Ada.Streams.Stream_IO.Reset
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205 (Stream_File_Object, Ada.Streams.Stream_IO.Append_File);
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206 exception
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207 when Ada.Streams.Stream_IO.Use_Error =>
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208 Report.Not_Applicable
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209 ( "Reset to Append_File not supported " &
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210 "for Stream_IO - 2" );
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211 raise Incomplete;
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212 end Reset2;
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213
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214 Integer'Write (Stream_Access_Value, Int_Var);
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215 -- Attempt read from Append_File mode file.
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216 Integer'Read (Stream_Access_Value, Int_Var);
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217 Report.Failed
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218 ("Exception not raised by 'Read of Append file");
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219 exception
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220 when Incomplete =>
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221 null;
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222 when Ada.Streams.Stream_IO.Mode_Error =>
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223 null;
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224 when others =>
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225 Report.Failed ("Incorrect exception raised - 4b");
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226 end Try_Read;
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227
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228 when others => Report.Failed ("Incorrect exception raised - 4a");
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229 end Check_Mode_Error;
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230
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231 -- Another example of a this type of potential error is to attempt
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232 -- to check for End Of File on a stream file that is currently in
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233 -- Out_File or Append_File mode. Mode_Error should also be raised
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234 -- in both of these cases.
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235 Check_End_File:
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236 declare
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237 Test_Boolean : Boolean := False;
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238 begin
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239 Reset3:
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240 begin
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241 Ada.Streams.Stream_IO.Reset (Stream_File_Object,
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242 Ada.Streams.Stream_IO.Out_File);
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243 exception
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244 when Ada.Streams.Stream_IO.Use_Error =>
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245 Report.Not_Applicable
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246 ( "Reset to Out_File not supported for Stream_IO - 3" );
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247 raise Incomplete;
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248 end Reset3;
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249
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250 Test_Boolean :=
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251 Ada.Streams.Stream_IO.End_Of_File (Stream_File_Object);
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252 Report.Failed ("Exception not raised by EOF on Out_File");
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253 exception
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254 when Incomplete =>
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255 null;
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256 when Ada.Streams.Stream_IO.Mode_Error =>
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257 null;
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258 EOF_For_Append_File:
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259 begin
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260 Reset4:
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261 begin
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262 Ada.Streams.Stream_IO.Reset
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263 (Stream_File_Object, Ada.Streams.Stream_IO.Append_File);
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264 exception
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265 when Ada.Streams.Stream_IO.Use_Error =>
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266 Report.Not_Applicable
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267 ( "Reset to Append_File not supported " &
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268 "for Stream_IO - 4" );
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269 raise Incomplete;
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270 end Reset4;
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271
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272 Test_Boolean :=
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273 Ada.Streams.Stream_IO.End_Of_File (Stream_File_Object);
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274 Report.Failed
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275 ("Exception not raised by EOF of Append file");
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276 exception
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277 when Incomplete =>
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278 raise;
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279 when Ada.Streams.Stream_IO.Mode_Error =>
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280 null;
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281 when others =>
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282 Report.Failed ("Incorrect exception raised - 5b");
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283 end EOF_For_Append_File;
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284
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285 when others => Report.Failed ("Incorrect exception raised - 5a");
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286 end Check_End_File;
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287
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288
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289
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290 -- In a similar situation to the above cases for attribute 'Read,
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291 -- an attempt to use the 'Output attribute on a stream file that
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292 -- is currently in In_File mode should result in Mode_Error being
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293 -- raised.
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294 Check_Output_Mode_Error:
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295 begin
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296 Reset5:
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297 begin
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298 Ada.Streams.Stream_IO.Reset (Stream_File_Object,
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299 Ada.Streams.Stream_IO.In_File);
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300 exception
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301 when Ada.Streams.Stream_IO.Use_Error =>
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302 Report.Not_Applicable
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303 ( "Reset to In_File not supported for Stream_IO - 6" );
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304 raise Incomplete;
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305 end Reset5;
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306
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307 Stream_Access_Value :=
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308 Ada.Streams.Stream_IO.Stream (Stream_File_Object);
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309 String'Output (Stream_Access_Value, "User-Oriented String");
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310 Report.Failed ("Exception not raised by 'Output to In_File");
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311 exception
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312 when Incomplete =>
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313 null;
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314 when Ada.Streams.Stream_IO.Mode_Error =>
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315 null;
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316 when others =>
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317 Report.Failed ("Incorrect exception raised - 6");
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318 end Check_Output_Mode_Error;
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319
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320 -- Any case of attempting to Open a stream file with a string for
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321 -- the parameter Name that does not allow the identification of an
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322 -- external file will result in the exception Name_Error being
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323 -- raised.
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324 Check_Illegal_File_Name:
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325 begin
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326 if Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then
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327 Ada.Streams.Stream_IO.Close (Stream_File_Object);
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328 end if;
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329 -- No external file exists with this filename, allowing no
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330 -- association with an internal file object, resulting in the
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331 -- raising of the exception Name_Error.
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332 Ada.Streams.Stream_IO.Open(File => Stream_File_Object,
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333 Mode => Ada.Streams.Stream_IO.Out_File,
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334 Name => Report.Legal_File_Name(2));
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335 Report.Failed ("Exception not raised by bad filename on Open");
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336 exception
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337 when Ada.Streams.Stream_IO.Name_Error =>
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338 null;
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339 when others =>
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340 Report.Failed ("Incorrect exception raised - 7");
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341 end Check_Illegal_File_Name;
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342
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343 exception
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344 when Incomplete =>
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345 null;
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346 when others =>
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347 Report.Failed ("Unexpected exception in Operational Test Block");
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348
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349 end Operational_Test_Block;
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350
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351 Deletion:
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352 begin
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353 if Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then
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354 Ada.Streams.Stream_IO.Delete (Stream_File_Object);
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355 else
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356 Ada.Streams.Stream_IO.Open (Stream_File_Object,
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357 Ada.Streams.Stream_IO.Out_File,
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358 Stream_Filename);
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359 Ada.Streams.Stream_IO.Delete (Stream_File_Object);
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360 end if;
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361 exception
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362 when others =>
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363 Report.Failed
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364 ( "Delete not properly implemented for Stream_IO" );
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365 end Deletion;
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366
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367 Report.Result;
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368
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369 exception
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370 when Incomplete =>
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371 Report.Result;
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372 when others =>
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373 Report.Failed ( "Unexpected exception" );
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374 Report.Result;
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375
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376 end CXAC003;
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