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jeremybenn |
-- CXAC003.A
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--
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-- Grant of Unlimited Rights
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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--
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-- DISCLAIMER
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- OBJECTIVE:
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-- Check that the correct exceptions are raised when improperly
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-- manipulating stream file objects.
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--
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-- TEST DESCRIPTION:
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-- This test is designed to focus on Stream_IO file manipulation
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-- exceptions. Several potentially common user errors are examined in
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-- the test:
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--
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-- A Status_Error should be raised whenever an attempt is made to perform
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-- an operation on a file that is closed.
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--
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-- A Status_Error should be raised when an attempt is made to open a
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-- stream file that is currently open.
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--
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-- A Mode_Error should be raised when attempting to read from (use the
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-- 'Read attribute) on an Out_File or Append_Mode file.
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--
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-- A Mode_Error should be raised when checking for End Of File on a
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-- file with mode Out_File or Append_Mode.
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--
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-- A Mode_Error should be raised when attempting to write to (use the
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-- 'Output attribute) on a file with mode In_File.
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--
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-- A Name_Error should be raised when the string provided to the Name
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-- parameter of an Open operation does not allow association of an
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-- external file.
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--
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-- APPLICABILITY CRITERIA:
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-- This test is applicable to all implementations capable of supporting
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-- external Stream_IO files.
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--
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--
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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-- 25 Feb 97 PWB.CTA Allowed for non-support of some IO operations
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-- 02 Mar 01 PHL Check that Ada.Streams.Stream_IO.Stream raises
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-- Status_Error if the file is not open. (DR 8652/
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-- 0056).
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-- 15 Mar 01 RLB Readied for release.
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--!
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with Ada.Streams.Stream_IO;
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with Report;
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procedure CXAC003 is
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Stream_File_Object : Ada.Streams.Stream_IO.File_Type;
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Stream_Access_Value : Ada.Streams.Stream_IO.Stream_Access;
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Stream_Filename : constant String :=
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Report.Legal_File_Name ( Nam => "CXAC003" );
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Incomplete : exception;
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begin
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Report.Test ("CXAC003", "Check that the correct exceptions are " &
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"raised when improperly manipulating stream " &
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"file objects");
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Test_for_Stream_IO_Support:
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begin
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-- If an implementation does not support Stream_IO in a particular
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-- environment, the exception Use_Error or Name_Error will be raised on
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-- calls to various Stream_IO operations. This block statement
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-- encloses a call to Create, which should produce an exception in a
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-- non-supportive environment. These exceptions will be handled to
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-- produce a Not_Applicable result.
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Ada.Streams.Stream_IO.Create (Stream_File_Object,
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Ada.Streams.Stream_IO.Out_File,
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Stream_Filename);
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exception
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when Ada.Streams.Stream_IO.Use_Error | Ada.Streams.Stream_IO.Name_Error =>
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Report.Not_Applicable
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( "Files not supported - Create as Out_File for Stream_IO" );
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raise Incomplete;
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end Test_for_Stream_IO_Support;
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Operational_Test_Block:
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begin
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-- A potentially common error in a file processing environment
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-- is to attempt to perform an operation on a stream file that is
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-- not currently open. Status_Error should be raised in this case.
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Check_Status_Error:
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begin
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Ada.Streams.Stream_IO.Close (Stream_File_Object);
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-- Attempt to reset a file that is closed.
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Ada.Streams.Stream_IO.Reset (Stream_File_Object,
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Ada.Streams.Stream_IO.Out_File);
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Report.Failed ("Exception not raised on Reset of closed file");
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exception
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when Ada.Streams.Stream_IO.Status_Error =>
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null;
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when others =>
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Report.Failed ("Incorrect exception raised - 1");
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end Check_Status_Error;
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-- A similar error is to use Ada.Streams.Stream_IO.Stream
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-- to attempt to perform an operation on a stream file that is
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-- not currently open. Status_Error should be raised in this case.
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-- (Defect Report 8652/0046, as reflected in Technical Corrigendum 1.)
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Check_Status_Error2:
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begin
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-- Ensure that the file is not open.
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if Ada.Streams.Stream_Io.Is_Open (Stream_File_Object) then
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Ada.Streams.Stream_Io.Close (Stream_File_Object);
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end if;
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Stream_Access_Value :=
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Ada.Streams.Stream_Io.Stream (Stream_File_Object);
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Report.Failed ("Exception not raised on Stream of closed file");
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exception
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when Ada.Streams.Stream_Io.Status_Error =>
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null;
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when others =>
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Report.Failed ("Incorrect exception raised - 2");
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end Check_Status_Error2;
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-- Another potentially common error in a file processing environment
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-- is to attempt to Open a stream file that is currently open.
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-- Status_Error should be raised in this case.
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Check_Status_Error3:
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begin
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-- Ensure that the file is open.
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if not Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then
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Ada.Streams.Stream_IO.Open (Stream_File_Object,
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Ada.Streams.Stream_IO.In_File,
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Stream_Filename);
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end if;
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Ada.Streams.Stream_IO.Open (Stream_File_Object,
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Ada.Streams.Stream_IO.In_File,
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Stream_Filename);
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Report.Failed ("Exception not raised on Open of open file");
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exception
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when Ada.Streams.Stream_IO.Status_Error =>
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null;
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when others =>
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Report.Failed ("Incorrect exception raised - 3");
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end Check_Status_Error3;
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-- Another example of a potential error occurring in a file
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-- processing environment is to attempt to use the 'Read attribute
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-- on a stream file that is currently in Out_File or Append_File
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-- mode. Mode_Error should be raised in both of these cases.
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Check_Mode_Error:
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declare
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Int_Var : Integer := -10;
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begin
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Reset1:
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begin
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Ada.Streams.Stream_IO.Reset (Stream_File_Object,
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Ada.Streams.Stream_IO.Out_File);
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exception
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when Ada.Streams.Stream_IO.Use_Error =>
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Report.Not_Applicable
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( "Reset to Out_File not supported for Stream_IO - 1" );
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raise Incomplete;
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end Reset1;
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Stream_Access_Value :=
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Ada.Streams.Stream_IO.Stream (Stream_File_Object);
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Integer'Write (Stream_Access_Value, Int_Var);
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-- File contains an integer value, but is of mode Out_File.
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Integer'Read (Stream_Access_Value, Int_Var);
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Report.Failed ("Exception not raised by 'Read of Out_File");
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exception
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when Incomplete =>
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raise;
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when Ada.Streams.Stream_IO.Mode_Error =>
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null;
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Try_Read:
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begin
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Reset2:
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begin
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Ada.Streams.Stream_IO.Reset
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(Stream_File_Object, Ada.Streams.Stream_IO.Append_File);
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exception
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when Ada.Streams.Stream_IO.Use_Error =>
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Report.Not_Applicable
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( "Reset to Append_File not supported " &
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"for Stream_IO - 2" );
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raise Incomplete;
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end Reset2;
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Integer'Write (Stream_Access_Value, Int_Var);
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-- Attempt read from Append_File mode file.
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Integer'Read (Stream_Access_Value, Int_Var);
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Report.Failed
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("Exception not raised by 'Read of Append file");
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exception
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when Incomplete =>
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null;
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when Ada.Streams.Stream_IO.Mode_Error =>
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null;
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when others =>
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Report.Failed ("Incorrect exception raised - 4b");
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end Try_Read;
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when others => Report.Failed ("Incorrect exception raised - 4a");
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end Check_Mode_Error;
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-- Another example of a this type of potential error is to attempt
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-- to check for End Of File on a stream file that is currently in
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-- Out_File or Append_File mode. Mode_Error should also be raised
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-- in both of these cases.
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Check_End_File:
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declare
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Test_Boolean : Boolean := False;
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begin
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Reset3:
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begin
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Ada.Streams.Stream_IO.Reset (Stream_File_Object,
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Ada.Streams.Stream_IO.Out_File);
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exception
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when Ada.Streams.Stream_IO.Use_Error =>
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Report.Not_Applicable
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( "Reset to Out_File not supported for Stream_IO - 3" );
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raise Incomplete;
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end Reset3;
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249 |
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Test_Boolean :=
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Ada.Streams.Stream_IO.End_Of_File (Stream_File_Object);
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Report.Failed ("Exception not raised by EOF on Out_File");
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exception
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when Incomplete =>
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null;
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when Ada.Streams.Stream_IO.Mode_Error =>
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null;
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EOF_For_Append_File:
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begin
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Reset4:
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begin
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262 |
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Ada.Streams.Stream_IO.Reset
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(Stream_File_Object, Ada.Streams.Stream_IO.Append_File);
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exception
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when Ada.Streams.Stream_IO.Use_Error =>
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Report.Not_Applicable
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( "Reset to Append_File not supported " &
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"for Stream_IO - 4" );
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raise Incomplete;
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end Reset4;
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271 |
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272 |
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Test_Boolean :=
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Ada.Streams.Stream_IO.End_Of_File (Stream_File_Object);
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274 |
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Report.Failed
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("Exception not raised by EOF of Append file");
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276 |
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exception
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277 |
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when Incomplete =>
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278 |
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raise;
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279 |
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when Ada.Streams.Stream_IO.Mode_Error =>
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280 |
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null;
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281 |
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when others =>
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282 |
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Report.Failed ("Incorrect exception raised - 5b");
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283 |
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end EOF_For_Append_File;
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284 |
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285 |
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when others => Report.Failed ("Incorrect exception raised - 5a");
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286 |
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end Check_End_File;
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287 |
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288 |
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289 |
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290 |
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-- In a similar situation to the above cases for attribute 'Read,
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291 |
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-- an attempt to use the 'Output attribute on a stream file that
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292 |
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-- is currently in In_File mode should result in Mode_Error being
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293 |
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-- raised.
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294 |
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Check_Output_Mode_Error:
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295 |
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begin
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296 |
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Reset5:
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297 |
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begin
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298 |
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Ada.Streams.Stream_IO.Reset (Stream_File_Object,
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299 |
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Ada.Streams.Stream_IO.In_File);
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300 |
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exception
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301 |
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when Ada.Streams.Stream_IO.Use_Error =>
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302 |
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Report.Not_Applicable
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303 |
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( "Reset to In_File not supported for Stream_IO - 6" );
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304 |
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raise Incomplete;
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305 |
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end Reset5;
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306 |
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307 |
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Stream_Access_Value :=
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308 |
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Ada.Streams.Stream_IO.Stream (Stream_File_Object);
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309 |
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String'Output (Stream_Access_Value, "User-Oriented String");
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310 |
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Report.Failed ("Exception not raised by 'Output to In_File");
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311 |
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exception
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312 |
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when Incomplete =>
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313 |
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null;
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314 |
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when Ada.Streams.Stream_IO.Mode_Error =>
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315 |
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null;
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316 |
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when others =>
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317 |
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Report.Failed ("Incorrect exception raised - 6");
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318 |
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end Check_Output_Mode_Error;
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319 |
|
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320 |
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-- Any case of attempting to Open a stream file with a string for
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321 |
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-- the parameter Name that does not allow the identification of an
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322 |
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-- external file will result in the exception Name_Error being
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323 |
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-- raised.
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324 |
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Check_Illegal_File_Name:
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325 |
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begin
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326 |
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if Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then
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327 |
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Ada.Streams.Stream_IO.Close (Stream_File_Object);
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328 |
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end if;
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329 |
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-- No external file exists with this filename, allowing no
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330 |
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-- association with an internal file object, resulting in the
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331 |
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-- raising of the exception Name_Error.
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332 |
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Ada.Streams.Stream_IO.Open(File => Stream_File_Object,
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333 |
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Mode => Ada.Streams.Stream_IO.Out_File,
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334 |
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Name => Report.Legal_File_Name(2));
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335 |
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Report.Failed ("Exception not raised by bad filename on Open");
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336 |
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exception
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337 |
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when Ada.Streams.Stream_IO.Name_Error =>
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338 |
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null;
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339 |
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when others =>
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340 |
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Report.Failed ("Incorrect exception raised - 7");
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341 |
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end Check_Illegal_File_Name;
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342 |
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343 |
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exception
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344 |
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when Incomplete =>
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345 |
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null;
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346 |
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when others =>
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347 |
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Report.Failed ("Unexpected exception in Operational Test Block");
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348 |
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349 |
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end Operational_Test_Block;
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350 |
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351 |
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Deletion:
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352 |
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begin
|
353 |
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if Ada.Streams.Stream_IO.Is_Open (Stream_File_Object) then
|
354 |
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Ada.Streams.Stream_IO.Delete (Stream_File_Object);
|
355 |
|
|
else
|
356 |
|
|
Ada.Streams.Stream_IO.Open (Stream_File_Object,
|
357 |
|
|
Ada.Streams.Stream_IO.Out_File,
|
358 |
|
|
Stream_Filename);
|
359 |
|
|
Ada.Streams.Stream_IO.Delete (Stream_File_Object);
|
360 |
|
|
end if;
|
361 |
|
|
exception
|
362 |
|
|
when others =>
|
363 |
|
|
Report.Failed
|
364 |
|
|
( "Delete not properly implemented for Stream_IO" );
|
365 |
|
|
end Deletion;
|
366 |
|
|
|
367 |
|
|
Report.Result;
|
368 |
|
|
|
369 |
|
|
exception
|
370 |
|
|
when Incomplete =>
|
371 |
|
|
Report.Result;
|
372 |
|
|
when others =>
|
373 |
|
|
Report.Failed ( "Unexpected exception" );
|
374 |
|
|
Report.Result;
|
375 |
|
|
|
376 |
|
|
end CXAC003;
|