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-- CXAC003.A

--

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--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained

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--

--                                    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 correct exceptions are raised when improperly

--      manipulating stream file objects.

--

-- TEST DESCRIPTION:

--      This test is designed to focus on Stream_IO file manipulation

--      exceptions.  Several potentially common user errors are examined in

--      the test:

--

--      A Status_Error should be raised whenever an attempt is made to perform

--      an operation on a file that is closed.

--

--      A Status_Error should be raised when an attempt is made to open a

--      stream file that is currently open.

--

--      A Mode_Error should be raised when attempting to read from (use the

--      'Read attribute) on an Out_File or Append_Mode file.

--

--      A Mode_Error should be raised when checking for End Of File on a

--      file with mode Out_File or Append_Mode.

--

--      A Mode_Error should be raised when attempting to write to (use the

--      'Output attribute) on a file with mode In_File.

--

--      A Name_Error should be raised when the string provided to the Name

--      parameter of an Open operation does not allow association of an

--      external file.

--

-- APPLICABILITY CRITERIA:

--      This test is applicable to all implementations capable of supporting

--      external Stream_IO files.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      25 Feb 97   PWB.CTA Allowed for non-support of some IO operations

--      02 Mar 01   PHL     Check that Ada.Streams.Stream_IO.Stream raises

--                          Status_Error if the file is not open.  (DR 8652/

--                          0056).

--      15 Mar 01   RLB     Readied for release.

--!

with Ada.Streams.Stream_IO;

with Report;

procedure CXAC003 is

   Stream_File_Object  : Ada.Streams.Stream_IO.File_Type;

   Stream_Access_Value : Ada.Streams.Stream_IO.Stream_Access;

   Stream_Filename     : constant String :=

                              Report.Legal_File_Name ( Nam => "CXAC003" );

   Incomplete : exception;

begin

   Report.Test ("CXAC003", "Check that the correct exceptions are "  &

                           "raised when improperly manipulating stream " &

                           "file objects");

   Test_for_Stream_IO_Support:

   begin

      -- If an implementation does not support Stream_IO in a particular

      -- environment, the exception Use_Error or Name_Error will be raised on

      -- calls to various Stream_IO operations.  This block statement

      -- encloses a call to Create, which should produce an exception in a

      -- non-supportive environment.  These exceptions will be handled to

      -- produce a Not_Applicable result.

      Ada.Streams.Stream_IO.Create (Stream_File_Object,

                                    Ada.Streams.Stream_IO.Out_File,

                                    Stream_Filename);

   exception

       when Ada.Streams.Stream_IO.Use_Error | Ada.Streams.Stream_IO.Name_Error =>

          Report.Not_Applicable

             ( "Files not supported - Create as Out_File for Stream_IO" );

          raise Incomplete;

   end Test_for_Stream_IO_Support;

   Operational_Test_Block:

   begin

      -- A potentially common error in a file processing environment

      -- is to attempt to perform an operation on a stream file that is

      -- not currently open. Status_Error should be raised in this case.

      Check_Status_Error:

      begin

         Ada.Streams.Stream_IO.Close (Stream_File_Object);

         -- Attempt to reset a file that is closed.

         Ada.Streams.Stream_IO.Reset (Stream_File_Object,

                                      Ada.Streams.Stream_IO.Out_File);

         Report.Failed ("Exception not raised on Reset of closed file");

      exception

         when Ada.Streams.Stream_IO.Status_Error =>

            null;

         when others       =>

            Report.Failed ("Incorrect exception raised - 1");

      end Check_Status_Error;

      -- A similar error is to use Ada.Streams.Stream_IO.Stream

      -- to attempt to perform an operation on a stream file that is

      -- not currently open. Status_Error should be raised in this case.

      -- (Defect Report 8652/0046, as reflected in Technical Corrigendum 1.)

      Check_Status_Error2:

      begin

         -- Ensure that the file is not open.

         if Ada.Streams.Stream_Io.Is_Open (Stream_File_Object) then

            Ada.Streams.Stream_Io.Close (Stream_File_Object);

         end if;

         Stream_Access_Value :=

            Ada.Streams.Stream_Io.Stream (Stream_File_Object);

         Report.Failed ("Exception not raised on Stream of closed file");

      exception

         when Ada.Streams.Stream_Io.Status_Error =>

            null;

         when others =>

            Report.Failed ("Incorrect exception raised - 2");

      end Check_Status_Error2;

      -- Another potentially common error in a file processing environment

      -- is to attempt to Open a stream file that is currently open.

      -- Status_Error should be raised in this case.

      Check_Status_Error3:

      begin

         -- Ensure that the file is open.

         if not Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then

            Ada.Streams.Stream_IO.Open (Stream_File_Object,

                                        Ada.Streams.Stream_IO.In_File,

                                        Stream_Filename);

         end if;

         Ada.Streams.Stream_IO.Open (Stream_File_Object,

                                     Ada.Streams.Stream_IO.In_File,

                                     Stream_Filename);

         Report.Failed ("Exception not raised on Open of open file");

      exception

         when Ada.Streams.Stream_IO.Status_Error =>

            null;

         when others       =>

            Report.Failed ("Incorrect exception raised - 3");

      end Check_Status_Error3;

      -- Another example of a potential error occurring in a file

      -- processing environment is to attempt to use the 'Read attribute

      -- on a stream file that is currently in Out_File or Append_File

      -- mode. Mode_Error should be raised in both of these cases.

      Check_Mode_Error:

      declare

         Int_Var : Integer := -10;

      begin

         Reset1:

         begin

            Ada.Streams.Stream_IO.Reset (Stream_File_Object,

                                         Ada.Streams.Stream_IO.Out_File);

         exception

            when Ada.Streams.Stream_IO.Use_Error =>

               Report.Not_Applicable

                  ( "Reset to Out_File not supported for Stream_IO - 1" );

               raise Incomplete;

         end Reset1;

         Stream_Access_Value :=

              Ada.Streams.Stream_IO.Stream (Stream_File_Object);

         Integer'Write (Stream_Access_Value, Int_Var);

         -- File contains an integer value, but is of mode Out_File.

         Integer'Read (Stream_Access_Value, Int_Var);

            Report.Failed ("Exception not raised by 'Read of Out_File");

      exception

         when Incomplete =>

            raise;

         when Ada.Streams.Stream_IO.Mode_Error =>

            null;

            Try_Read:

            begin

               Reset2:

               begin

                  Ada.Streams.Stream_IO.Reset

                    (Stream_File_Object, Ada.Streams.Stream_IO.Append_File);

               exception

                  when Ada.Streams.Stream_IO.Use_Error =>

                     Report.Not_Applicable

                        ( "Reset to Append_File not supported " &

                          "for Stream_IO - 2" );

                     raise Incomplete;

               end Reset2;

               Integer'Write (Stream_Access_Value, Int_Var);

               -- Attempt read from Append_File mode file.

               Integer'Read (Stream_Access_Value, Int_Var);

               Report.Failed

                  ("Exception not raised by 'Read of Append file");

            exception

               when Incomplete =>

                  null;

               when Ada.Streams.Stream_IO.Mode_Error =>

                  null;

               when others     =>

                  Report.Failed ("Incorrect exception raised - 4b");

            end Try_Read;

         when others => Report.Failed ("Incorrect exception raised - 4a");

      end Check_Mode_Error;

      -- Another example of a this type of potential error is to attempt

      -- to check for End Of File on a stream file that is currently in

      -- Out_File or Append_File mode. Mode_Error should also be raised

      -- in both of these cases.

      Check_End_File:

      declare

         Test_Boolean : Boolean := False;

      begin

         Reset3:

         begin

            Ada.Streams.Stream_IO.Reset (Stream_File_Object,

                                         Ada.Streams.Stream_IO.Out_File);

         exception

            when Ada.Streams.Stream_IO.Use_Error =>

               Report.Not_Applicable

                  ( "Reset to Out_File not supported for Stream_IO - 3" );

               raise Incomplete;

         end Reset3;

         Test_Boolean :=

           Ada.Streams.Stream_IO.End_Of_File (Stream_File_Object);

         Report.Failed ("Exception not raised by EOF on Out_File");

      exception

         when Incomplete =>

            null;

         when Ada.Streams.Stream_IO.Mode_Error =>

            null;

            EOF_For_Append_File:

            begin

               Reset4:

               begin

                  Ada.Streams.Stream_IO.Reset

                    (Stream_File_Object, Ada.Streams.Stream_IO.Append_File);

               exception

                  when Ada.Streams.Stream_IO.Use_Error =>

                     Report.Not_Applicable

                        ( "Reset to Append_File not supported " &

                          "for Stream_IO - 4" );

                     raise Incomplete;

               end Reset4;

               Test_Boolean :=

                 Ada.Streams.Stream_IO.End_Of_File (Stream_File_Object);

               Report.Failed

                 ("Exception not raised by EOF of Append file");

            exception

               when Incomplete =>

                  raise;

               when Ada.Streams.Stream_IO.Mode_Error =>

                  null;

               when others     =>

                  Report.Failed ("Incorrect exception raised - 5b");

            end EOF_For_Append_File;

         when others => Report.Failed ("Incorrect exception raised - 5a");

      end Check_End_File;

      -- In a similar situation to the above cases for attribute 'Read,

      -- an attempt to use the 'Output attribute on a stream file that

      -- is currently in In_File mode should result in Mode_Error being

      -- raised.

         Check_Output_Mode_Error:

         begin

            Reset5:

            begin

               Ada.Streams.Stream_IO.Reset (Stream_File_Object,

                                            Ada.Streams.Stream_IO.In_File);

         exception

            when Ada.Streams.Stream_IO.Use_Error =>

               Report.Not_Applicable

                  ( "Reset to In_File not supported for Stream_IO - 6" );

               raise Incomplete;

         end Reset5;

         Stream_Access_Value :=

           Ada.Streams.Stream_IO.Stream (Stream_File_Object);

         String'Output (Stream_Access_Value, "User-Oriented String");

         Report.Failed ("Exception not raised by 'Output to In_File");

      exception

         when Incomplete =>

            null;

         when Ada.Streams.Stream_IO.Mode_Error =>

            null;

         when others     =>

            Report.Failed ("Incorrect exception raised - 6");

      end Check_Output_Mode_Error;

      -- Any case of attempting to Open a stream file with a string for

      -- the parameter Name that does not allow the identification of an

      -- external file will result in the exception Name_Error being

      -- raised.

      Check_Illegal_File_Name:

      begin

         if Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then

            Ada.Streams.Stream_IO.Close (Stream_File_Object);

         end if;

         -- No external file exists with this filename, allowing no

         -- association with an internal file object, resulting in the

         -- raising of the exception Name_Error.

         Ada.Streams.Stream_IO.Open(File => Stream_File_Object,

                                    Mode => Ada.Streams.Stream_IO.Out_File,

                                    Name => Report.Legal_File_Name(2));

         Report.Failed ("Exception not raised by bad filename on Open");

      exception

         when Ada.Streams.Stream_IO.Name_Error =>

            null;

         when others     =>

            Report.Failed ("Incorrect exception raised - 7");

      end Check_Illegal_File_Name;

   exception

         when Incomplete =>

            null;

         when others =>

            Report.Failed ("Unexpected exception in Operational Test Block");

   end Operational_Test_Block;

   Deletion:

   begin

      if Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then

         Ada.Streams.Stream_IO.Delete (Stream_File_Object);

      else

         Ada.Streams.Stream_IO.Open (Stream_File_Object,

                                     Ada.Streams.Stream_IO.Out_File,

                                     Stream_Filename);

         Ada.Streams.Stream_IO.Delete (Stream_File_Object);

      end if;

   exception

      when others =>

         Report.Failed

            ( "Delete not properly implemented for Stream_IO" );

   end Deletion;

   Report.Result;

exception

   when Incomplete =>

      Report.Result;

   when others     =>

      Report.Failed ( "Unexpected exception" );

      Report.Result;

end CXAC003;