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-- CXAA012.A

--

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--                                    DISCLAIMER

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--*

--

-- 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;