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1 -- CXAA013.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 exception Mode_Error is raised when an attempt is made
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28 -- to skip a line or page using the predefined Skip_Line and Skip_Page
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29 -- procedures on a text file with mode Append_File.
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30 --
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31 -- TEST DESCRIPTION:
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32 -- A scenario is created that demonstrates the potential for the
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33 -- incorrect usage of predefined text processing subprograms, which
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34 -- results in the raising of a Mode_Error exception.
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35 -- A count is kept to ensure that each anticipated exception is in fact
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36 -- raised and handled properly.
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37 --
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38 -- APPLICABILITY CRITERIA:
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39 -- This test is applicable only to implementations that support text
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40 -- files.
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41 --
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42 --
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43 -- CHANGE HISTORY:
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44 -- 06 Dec 94 SAIC ACVC 2.0
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45 -- 28 Feb 97 PWB.CTA Allowed for non-support of some IO operations
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46 --!
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47
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48 with Ada.Text_IO;
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49 with Report;
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50
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51 procedure CXAA013 is
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52 use Ada;
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53 Text_File : Text_IO.File_Type;
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54 Text_Filename : constant String :=
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55 Report.Legal_File_Name ( Nam => "CXAA013" );
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56 Incomplete : exception;
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57
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58 begin
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59
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60 Report.Test ("CXAA013", "Check that the exception Mode_Error is " &
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61 "raised when an attempt is made to skip " &
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62 "a line or page using the predefined " &
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63 "Skip_Line and Skip_Page procedures on " &
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64 "a text file with mode Append_File");
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65
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66 Test_for_Text_IO_Support:
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67 begin
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68
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69 -- An application creates a text file with mode Append_File.
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70 -- Use_Error will be raised if Text_IO operations or external files are not
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71 -- supported.
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72
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73 Text_IO.Create (Text_File, Text_IO.Append_File, Text_Filename);
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74
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75 exception
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76
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77 when Text_IO.Use_Error | Text_IO.Name_Error =>
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78 Report.Not_Applicable
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79 ( "Files not supported - Create as Append_File for Text_IO" );
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80 raise Incomplete;
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81
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82 end Test_for_Text_IO_Support;
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83
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84 -- The application writes some amount of data to the file.
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85
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86 Text_IO.Put_Line (Text_File, "Data entered into the file");
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87
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88 Operational_Test_Block:
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89 declare
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90 TC_Number_Of_Forced_Mode_Errors : constant Natural := 2;
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91 TC_Mode_Errors : Natural := 0;
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92 begin
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93
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94 Test_for_Skip_Line:
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95 declare
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96 TC_Spacing : constant Text_IO.Count := 3;
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97 begin
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98
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99 -- During the course of its processing, the application may attempt to
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100 -- invoke the Skip_Line procedure on a file that is currently in Append_File
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101 -- mode (instead of the anticipated In_File mode). This results in the
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102 -- raising of Mode_Error.
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103
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104 Text_IO.Skip_Line (Text_File, TC_Spacing);
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105 Report.Failed ("Exception not raised by Skip_Line");
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106
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107 -- An exception handler present within the application handles the exception
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108 -- and processing can continue.
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109
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110 exception
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111 when Text_IO.Mode_Error =>
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112 TC_Mode_Errors := TC_Mode_Errors + 1;
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113 when others =>
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114 Report.Failed("Exception in Skip_Line processing");
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115 end Test_for_Skip_Line;
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116
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117 Test_for_Skip_Page:
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118 begin
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119
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120 -- Again, during the course of its processing, the application incorrectly
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121 -- assumes that the file mode is In_File, this time attempting to call the
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122 -- Skip_Page procedure for the file (that is currently in Append_File mode).
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123
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124 Text_IO.Skip_Page (Text_File);
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125 Report.Failed ("Exception not raised by Skip_Page");
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126
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127 -- Once again, an exception handler present within the application handles
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128 -- the exception and processing continues.
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129
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130 exception
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131 when Text_IO.Mode_Error =>
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132 TC_Mode_Errors := TC_Mode_Errors + 1;
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133 when others =>
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134 Report.Failed("Exception in Skip_Page processing");
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135 end Test_for_Skip_Page;
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136
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137 if (TC_Mode_Errors /= TC_Number_Of_Forced_Mode_Errors) then
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138 Report.Failed ("Incorrect number of exceptions handled");
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139 end if;
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140
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141 end Operational_Test_Block;
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142
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143 Deletion:
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144 begin
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145 -- Delete the external file.
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146 if Text_IO.Is_Open (Text_File) then
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147 Text_IO.Delete (Text_File);
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148 else
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149 Text_IO.Open (Text_File, Text_IO.In_File, Text_Filename);
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150 Text_IO.Delete (Text_File);
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151 end if;
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152 exception
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153 when others =>
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154 Report.Failed
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155 ( "Delete not properly implemented for Text_IO" );
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156 end Deletion;
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157
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158 Report.Result;
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159
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160 exception
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161 when Incomplete =>
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162 Report.Result;
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163 when others =>
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164 Report.Failed ( "Unexpected exception" );
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165 Report.Result;
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166
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167 end CXAA013;
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