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--- CXAA012.A
---
--- Grant of Unlimited Rights
---
--- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
--- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
--- unlimited rights in the software and documentation contained herein.
--- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
--- this public release, the Government intends to confer upon all
--- recipients unlimited rights equal to those held by the Government.
--- These rights include rights to use, duplicate, release or disclose the
--- released technical data and computer software in whole or in part, in
--- any manner and for any purpose whatsoever, and to have or permit others
--- to do so.
---
--- DISCLAIMER
---
--- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
--- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
--- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
--- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
--- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
--- PARTICULAR PURPOSE OF SAID MATERIAL.
---*
---
--- OBJECTIVE:
--- Check that the exception Mode_Error is raised when an attempt is made
--- to read from (perform a Get_Line) or use the predefined End_Of_File
--- function on a text file with mode Append_File.
---
--- TEST DESCRIPTION:
--- A scenario is created that demonstrates the potential for the
--- incorrect usage of predefined text processing subprograms, resulting
--- from their use with files of the wrong Mode. This results in the
--- raising of Mode_Error exceptions, which is handled within blocks
--- embedded in the test.
--- A count is kept to ensure that each anticipated exception is in fact
--- raised and handled properly.
---
--- APPLICABILITY CRITERIA:
--- This test is applicable only to implementations that support text
--- files.
---
---
--- CHANGE HISTORY:
--- 06 Dec 94 SAIC ACVC 2.0
--- 27 Feb 97 PWB.CTA Allowed for non-support of some IO operations
---!
-
-with Ada.Text_IO;
-with Report;
-
-procedure CXAA012 is
- use Ada;
- Text_File : Text_IO.File_Type;
- Text_Filename : constant String :=
- Report.Legal_File_Name ( Nam => "CXAA012" );
- Incomplete : exception;
-begin
-
- Report.Test ("CXAA012", "Check that the exception Mode_Error is " &
- "raised when an attempt is made to read " &
- "from (perform a Get_Line) or use the " &
- "predefined End_Of_File function on a " &
- "text file with mode Append_File");
-
- Test_for_Text_IO_Support:
- begin
-
- -- Use_Error or Name_Error will be raised if Text_IO operations
- -- or external files are not supported.
-
- Text_IO.Create (Text_File, Text_IO.Out_File, Text_Filename);
-
- exception
- when Text_IO.Use_Error | Text_IO.Name_Error =>
- Report.Not_Applicable
- ( "Files not supported - Create as Out_File for Text_IO" );
- raise Incomplete;
- end Test_for_Text_IO_Support;
-
- -- The application writes some amount of data to the file.
-
- Text_IO.Put_Line (Text_File, "Data entered into the file");
-
- Text_IO.Close (Text_File);
-
- Operational_Test_Block:
- declare
- TC_Number_Of_Forced_Mode_Errors : constant Natural := 2;
- TC_Mode_Errors : Natural := 0;
- begin
-
- Text_IO.Open (Text_File, Text_IO.Append_File, Text_Filename);
-
- Test_for_Reading:
- declare
- TC_Data : String (1..80);
- TC_Length : Natural := 0;
- begin
-
--- During the course of its processing, the application may become confused
--- and erroneously attempt to read data from the file that is currently in
--- Append_File mode (instead of the anticipated In_File mode).
--- This would result in the raising of Mode_Error.
-
- Text_IO.Get_Line (Text_File, TC_Data, TC_Length);
- Report.Failed ("Exception not raised by Get_Line");
-
--- An exception handler present within the application handles the exception
--- and processing can continue.
-
- exception
- when Text_IO.Mode_Error =>
- TC_Mode_Errors := TC_Mode_Errors + 1;
- when others =>
- Report.Failed ("Exception in Get_Line processing");
- end Test_for_Reading;
-
-
- Test_for_End_Of_File:
- declare
- TC_End_Of_File : Boolean;
- begin
-
--- Again, during the course of its processing, the application attempts to
--- call the End_Of_File function for the file that is currently in
--- Append_File mode (instead of the anticipated In_File mode).
-
- TC_End_Of_File := Text_IO.End_Of_File (Text_File);
- Report.Failed ("Exception not raised by End_Of_File");
-
--- Once again, an exception handler present within the application handles
--- the exception and processing continues.
-
- exception
- when Text_IO.Mode_Error =>
- TC_Mode_Errors := TC_Mode_Errors + 1;
- when others =>
- Report.Failed("Exception in End_Of_File processing");
- end Test_for_End_Of_File;
-
-
- if (TC_Mode_Errors /= TC_Number_Of_Forced_Mode_Errors) then
- Report.Failed ("Incorrect number of exceptions handled");
- end if;
-
- end Operational_Test_Block;
-
- -- Delete the external file.
- if Text_IO.Is_Open (Text_File) then
- Text_IO.Delete (Text_File);
- else
- Text_IO.Open (Text_File, Text_IO.In_File, Text_Filename);
- Text_IO.Delete (Text_File);
- end if;
-
- Report.Result;
-
-exception
- when Incomplete =>
- Report.Result;
- when others =>
- Report.Failed ( "Unexpected exception" );
- Report.Result;
-
-end CXAA012;