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-- CXAA001.A

--

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--

-- OBJECTIVE:

--      Check that the Line_Length and Page_Length maximums for a Text_IO

--      file of mode Append_File are initially zero (unbounded) after a

--      Create, Open, or Reset, and that these values can be modified using

--      the procedures Set_Line_Length and Set_Page_Length.

--      Check that setting the Line_Length and Page_Length attributes to zero

--      results in an unbounded Text_IO file.

--      Check that setting the line length when in Append_Mode doesn't

--      change the length of lines previously written to the Text_IO file.

--

-- TEST DESCRIPTION:

--      This test attempts to simulate a possible text processing environment.

--      String values, from a number of different string types, are written to

--      a Text_IO file.  Prior to the writing of each, the line length is set

--      to the particular length of the data being written.  In addition, the

--      default line and page lengths are checked, to determine whether they

--      are unbounded (length = 0) following a create, reset, or open of a

--      Text_IO file with mode Append_File.

--

-- 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 CXAA001 is

   use Ada;

   Data_File      : Text_IO.File_Type;

   Data_Filename  : constant String :=

                              Report.Legal_File_Name ( Nam => "CXAA001" );

   Incomplete : exception;

begin

   Report.Test ("CXAA001","Check that the Line_Length and Page_Length "      &

                          "maximums for a Text_IO file of mode Append_File " &

                          "are initially zero (unbounded) after a Create, "  &

                          "Open, or Reset, and that these values can be "    &

                          "modified using the procedures Set_Line_Length "   &

                          "and Set_Page_Length");

   Test_for_Text_IO_Support:

   begin

      -- An implementation that does not support Text_IO in a particular

      -- environment will raise Use_Error on calls to various

      -- Text_IO operations.  This block statement encloses a call to

      -- Create, which should raise an exception in a non-supportive

      -- environment.  This exception will be handled to produce a

      -- Not_Applicable result.

      Text_IO.Create (File => Data_File,

                      Mode => Text_IO.Append_File,

                      Name => Data_Filename);

   exception

       when Text_IO.Use_Error | Text_IO.Name_Error =>

          Report.Not_Applicable

             ( "Files not supported - Create as Append_File for Text_IO" );

          raise Incomplete;

   end Test_for_Text_IO_Support;

   Operational_Test_Block:

   declare

      subtype Confidential_Data_Type is string (1 .. 10);

      subtype Secret_Data_Type       is string (1 .. 20);

      subtype Top_Secret_Data_Type   is string (1 .. 30);

      Zero                   : constant Text_IO.Count :=  0;

      Confidential_Data_Size : constant Text_IO.Count := 10;

      Secret_Data_Size       : constant Text_IO.Count := 20;

      Top_Secret_Data_Size   : constant Text_IO.Count := 30;

      -- The following generic procedure is designed to simulate a text

      -- processing environment where line and page sizes are set and

      -- verified prior to the writing of data to a file.

      generic

         Data_Size : Text_IO.Count;

      procedure Write_Data_To_File (Data_Item : in String);

      procedure Write_Data_To_File (Data_Item : in String) is

         use Text_IO;  -- Used to provide visibility to the "/=" operator.

      begin

         if (Text_IO.Line_Length (Data_File) /= Zero) then -- Check default

            Report.Failed("Line not of unbounded length"); -- line length,

         elsif (Text_IO.Page_Length (Data_File) /= Zero) then -- default

            Report.Failed ("Page not of unbounded length"); -- page length.

         end if;

         Text_IO.Set_Line_Length (File => Data_File,    -- Set the line

                                  To   => Data_Size);   -- length.

         Text_IO.Set_Page_Length (File => Data_File,    -- Set the page

                                  To   => Data_Size);   -- length.

         -- Verify the lengths set.

         if (Integer(Text_IO.Line_Length (Data_File)) /=

             Report.Ident_Int(Integer(Data_Size))) then

            Report.Failed ("Line length not set to appropriate length");

         elsif (Integer(Text_IO.Page_Length (Data_File)) /=

                Report.Ident_Int(Integer(Data_Size))) then

            Report.Failed ("Page length not set to appropriate length");

         end if;

         Text_IO.Put_Line (File => Data_File,           -- Write data to

                           Item => Data_Item);          -- file.

      end Write_Data_To_File;

      -- Instantiation for the three data types/sizes.

      procedure Write_Confidential_Data is

        new Write_Data_To_File (Data_Size => Confidential_Data_Size);

      procedure Write_Secret_Data is

        new Write_Data_To_File (Data_Size => Secret_Data_Size);

      procedure Write_Top_Secret_Data is

        new Write_Data_To_File (Data_Size => Top_Secret_Data_Size);

      Confidential_Item : Confidential_Data_Type := "Confidenti";

      Secret_Item       : Secret_Data_Type       := "Secret Data Values  ";

      Top_Secret_Item   : Top_Secret_Data_Type   :=

        "Extremely Top Secret Data     ";

   begin

      -- The following call simulates processing occurring after the create

      -- of a Text_IO file with mode Append_File.

      Write_Confidential_Data (Confidential_Item);

      -- The following call simulates processing occurring after the reset

      -- of a Text_IO file with mode Append_File.

      Reset1:

      begin

         Text_IO.Reset (Data_File, Text_IO.Append_File); -- Reset to

                                                         -- Append_File mode.

      exception

         when Text_IO.Use_Error =>

            Report.Not_Applicable

               ( "Reset to Append_File not supported for Text_IO" );

            raise Incomplete;

      end Reset1;

      Write_Secret_Data (Data_Item    => Secret_Item);

      Text_IO.Close (Data_File);                      -- Close file.

      -- The following processing simulates processing occurring after the

      -- opening of an existing file with mode Append_File.

      Text_IO.Open (Data_File,                        -- Open file in

                    Text_IO.Append_File,              -- Append_File mode.

                    Data_Filename);

      Write_Top_Secret_Data (Top_Secret_Item);

      Test_Verification_Block:

      declare

         TC_String1,

         TC_String2,

         TC_String3  : String (1..80) := (others => ' ');

         TC_Length1,

         TC_Length2,

         TC_Length3  : Natural := 0;

      begin

         Reset2:

         begin

            Text_IO.Reset (Data_File, Text_IO.In_File); -- Reset for reading.

         exception

            when Text_IO.Use_Error =>

               Report.Not_Applicable

                  ( "Reset to In_File not supported for Text_IO" );

               raise Incomplete;

         end Reset2;

         Text_IO.Get_Line (Data_File, TC_String1, TC_Length1);

         Text_IO.Get_Line (Data_File, TC_String2, TC_Length2);

         Text_IO.Get_Line (Data_File, TC_String3, TC_Length3);

         -- Verify that the line lengths of each line were accurate.

         -- Note: Each data line was written to the file after the

         -- particular line length had been set (to the data length).

         if not ((TC_Length1 = Natural(Confidential_Data_Size)) and

                 (TC_Length2 = Natural(Secret_Data_Size))       and

                 (TC_Length3 = Natural(Top_Secret_Data_Size)))  then

            Report.Failed ("Inaccurate line lengths read from file");

         end if;

         -- Verify that the data read from the file are accurate.

         if (TC_String1(1..TC_Length1) /= Confidential_Item) or else

            (TC_String2(1..TC_Length2) /= Secret_Item)       or else

            (TC_String3(1..TC_Length3) /= Top_Secret_Item)   then

            Report.Failed ("Corrupted data items read from file");

         end if;

      exception

         when Incomplete =>

            raise;

         when others =>

               Report.Failed ("Error raised during data verification");

      end Test_Verification_Block;

   exception

         when Incomplete =>

            raise;

         when others =>

            Report.Failed ("Exception raised during Text_IO processing");

      end Operational_Test_Block;

      Deletion:

      begin

         -- Check that the file is open prior to deleting it.

         if Text_IO.Is_Open(Data_File) then

            Text_IO.Delete(Data_File);

         else

            Text_IO.Open(Data_File, Text_IO.In_File, Data_Filename);

            Text_IO.Delete(Data_File);

         end if;

   exception

      when others =>

         Report.Failed

            ( "Delete not properly implemented for Text_IO" );

   end Deletion;

   Report.Result;

exception

   when Incomplete =>

      Report.Result;

   when others     =>

      Report.Failed ( "Unexpected exception" );

      Report.Result;

end CXAA001;