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-- CXA8003.A

--

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--

-- OBJECTIVE:

--      Check that Append_File mode has not been added to package Direct_IO.

--

-- TEST DESCRIPTION:

--      This test uses a procedure to change the mode of an existing Direct_IO

--      file.  The file descriptor is passed as a parameter, along with a

--      numeric indicator for the new mode.  Based on the numeric parameter,

--      a Direct_IO.Reset is performed using a File_Mode'Value transformation

--      of a string constant into a File_Mode value.  An attempt to reset a

--      Direct_IO file to mode Append_File should cause an Constraint_Error

--      to be raised, as Append_File mode has not been added to Direct_IO in

--      Ada 9X.

--

-- APPLICABILITY CRITERIA:

--      This test is applicable to all implementations supporting Direct_IO

--      files.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      19 Feb 97   PWB.CTA Allowed for non-support of Reset for certain

--                  modes.

--!

with Direct_IO;

with Report;

procedure CXA8003 is

   Incomplete : exception;

      begin

         Report.Test ("CXA8003", "Check that Append_File mode has not " &

                                 "been added to package Direct_IO");

         Test_for_Direct_IO_Support:

         declare

            subtype String_Data_Type    is String (1 .. 20);

            type    Numeric_Data_Type   is range 1 .. 512;

            type    Composite_Data_Type is array (1 .. 3) of String_Data_Type;

            type File_Data_Type is record

               Data_Field_1 : String_Data_Type;

               Data_Field_2 : Numeric_Data_Type;

               Data_Field_3 : Composite_Data_Type;

            end record;

            package Dir_IO is new Direct_IO (File_Data_Type);

            Data_File    : Dir_IO.File_Type;

            Dir_Filename : constant String := Report.Legal_File_Name;

         begin

            -- An application creates a text file with mode Out_File.

            -- Use_Error will be raised if Direct_IO operations or external

            -- files are not supported.

            Dir_IO.Create (Data_File,

                           Dir_IO.Out_File,

                           Dir_Filename);

            Change_File_Mode:

            declare

               TC_Append_Test_Executed : Boolean := False;

               type Mode_Selection_Type is ( A, I, IO, O );

               procedure Change_Mode (File : in out Dir_IO.File_Type;

                                      To   : in     Mode_Selection_Type) is

               begin

                  case To is

                     when A  =>

                        TC_Append_Test_Executed := True;

                        Dir_IO.Reset

                          (File, Dir_IO.File_Mode'Value("Append_File"));

                     when I  =>

                        begin

                          Dir_IO.Reset

                            (File, Dir_IO.File_Mode'Value("In_File"));

                        exception

                          when Dir_IO.Use_Error =>

                            Report.Not_Applicable

                              ("Reset to In_File not supported: Direct_IO");

                            raise Incomplete;

                        end;

                     when IO =>

                        begin

                          Dir_IO.Reset

                            (File, Dir_IO.File_Mode'Value("Inout_File"));

                        exception

                          when Dir_IO.Use_Error =>

                            Report.Not_Applicable

                              ("Reset to InOut_File not supported: Direct_IO");

                            raise Incomplete;

                        end;

                     when O  =>

                       begin

                         Dir_IO.Reset

                           (File, Dir_IO.File_Mode'Value("Out_File"));

                        exception

                          when Dir_IO.Use_Error =>

                            Report.Not_Applicable

                              ("Reset to Out_File not supported: Direct_IO");

                            raise Incomplete;

                        end;

                  end case;

               end Change_Mode;

            begin

              -- At some point in the processing, the application may call a

              -- procedure to change the mode of the file (perhaps for

              -- additional data entry, data verification, etc.).  It is at

              -- this point that a use of Append_File mode for a Direct_IO

              -- file would cause an exception.

               for I in reverse Mode_Selection_Type loop

                  Change_Mode (Data_File, I);

                  Report.Comment

                    ("Mode changed to " &

                     Dir_IO.File_Mode'Image (Dir_IO.Mode (Data_File)));

               end loop;

               Report.Failed("No error raised on change to Append_File mode");

            exception

               -- A handler has been provided in the application, which

               -- handles the constraint error, allowing processing to

               -- continue.

               when Constraint_Error =>

                  if TC_Append_Test_Executed then

                     Report.Comment ("Constraint_Error correctly raised on " &

                                     "attempted Append_File mode selection " &

                                     "for a Direct_IO file");

                  else

                     Report.Failed ("Append test was not executed");

                  end if;

               when Incomplete => raise;

               when others  => Report.Failed ("Unexpected exception raised");

            end Change_File_Mode;

            Final_Block:

            begin

              if Dir_IO.Is_Open (Data_File) then

                 Dir_IO.Delete (Data_File);

              else

                 Dir_IO.Open (Data_File, Dir_IO.In_File, Dir_Filename);

                 Dir_IO.Delete (Data_File);

              end if;

            exception

              when others =>

                Report.Failed ("Delete not properly supported: Direct_IO");

            end Final_Block;

         exception

            -- Since Use_Error or Name_Error can be raised if, for the

            -- specified mode, the environment does not support Direct_IO

            -- operations, the following handlers are included:

            when Dir_IO.Name_Error =>

               Report.Not_Applicable("Name_Error raised on Direct IO Create");

            when Dir_IO.Use_Error  =>

               Report.Not_Applicable("Use_Error raised on Direct IO Create");

            when others            =>

               Report.Failed

                 ("Unexpected exception raised on Direct IO Create");

         end Test_for_Direct_IO_Support;

         Report.Result;

exception

  when Incomplete =>

    Report.Result;

end CXA8003;