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|
-- CXAA015.A
--
-- Grant of Unlimited Rights
--
-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
-- unlimited rights in the software and documentation contained herein.
-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
-- this public release, the Government intends to confer upon all
-- recipients unlimited rights equal to those held by the Government.
-- These rights include rights to use, duplicate, release or disclose the
-- released technical data and computer software in whole or in part, in
-- any manner and for any purpose whatsoever, and to have or permit others
-- to do so.
--
-- 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 exception Status_Error is raised when an attempt is
-- made to create or open a file in Append_File mode when the file is
-- already open.
-- Check that the exception Name_Error is raised by procedure Open when
-- attempting to open a file in Append_File mode when the name supplied
-- as the filename does not correspond to an existing external file.
--
-- TEST DESCRIPTION:
-- A scenario is created that demonstrates the potential for the
-- inappropriate usage of text processing subprograms Create and Open,
-- resulting in the raising of Status_Error and Name_Error exceptions.
-- 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
-- 28 Feb 97 PWB.CTA Allowed for non-support of some IO operations
--!
with Ada.Text_IO;
with Report;
procedure CXAA015 is
use Ada;
Text_File : Text_IO.File_Type;
Text_Filename : constant String :=
Report.Legal_File_Name ( Nam => "CXAA015" );
Incomplete : exception;
begin
Report.Test ("CXAA015", "Check that the appropriate exceptions " &
"are raised when procedures Create and " &
"Open are used to inappropriately operate " &
"on files of mode Append_File");
Test_for_Text_IO_Support:
begin
-- An application creates a text file with mode Append_File.
-- Use_Error will be raised if Text_IO operations or external files are not
-- supported.
Text_IO.Create (Text_File, Text_IO.Append_File, Text_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;
-- The application writes some amount of data to the file.
for I in 1 .. 5 loop
Text_IO.Put_Line (Text_File, "Data entered into the file");
end loop;
Operational_Test_Block:
declare
TC_Number_Of_Forced_Errors : constant Natural := 3;
TC_Errors : Natural := 0;
begin
Test_for_Create:
begin
-- During the course of its processing, the application may (erroneously)
-- attempt to create the same file already in existence in Append_File mode.
-- This results in the raising of Status_Error.
Text_IO.Create (Text_File,
Text_IO.Append_File,
Text_Filename);
Report.Failed ("Exception not raised by Create");
-- An exception handler present within the application handles the exception
-- and processing can continue.
exception
when Text_IO.Status_Error =>
TC_Errors := TC_Errors + 1;
when others =>
Report.Failed("Exception in Create processing");
end Test_for_Create;
First_Test_For_Open:
begin
-- Again, during the course of its processing, the application incorrectly
-- attempts to Open a file (in Append_File mode) that is already open.
Text_IO.Open (Text_File, Text_IO.Append_File, Text_Filename);
Report.Failed ("Exception not raised by improper Open - 1");
-- Once again, an exception handler present within the application handles
-- the exception and processing continues.
exception
when Text_IO.Status_Error =>
TC_Errors := TC_Errors + 1;
-- At some point in its processing, the application closes the file that is
-- currently open.
Text_IO.Close (Text_File);
when others =>
Report.Failed("Exception in Open processing - 1");
end First_Test_For_Open;
Open_With_Wrong_Filename:
declare
TC_Wrong_Filename : constant String :=
Report.Legal_File_Name(2);
begin
-- At this point, the application attempts to Open (in Append_File mode) the
-- file used in previous processing, but it attempts this Open using a name
-- string that does not correspond to any existing external file.
-- First make sure the file doesn't exist. (If it did, then the check
-- for open in append mode wouldn't work.)
Verify_No_File:
begin
Text_IO.Open (Text_File,
Text_IO.In_File,
TC_Wrong_Filename);
exception
when Text_IO.Name_Error =>
null;
when others =>
Report.Failed ( "Unexpected exception on Open check" );
end Verify_No_File;
Delete_No_File:
begin
if Text_IO.Is_Open (Text_File) then
Text_IO.Delete (Text_File);
end if;
exception
when others =>
Report.Failed ( "Unexpected exception - Delete check" );
end Delete_No_File;
Text_IO.Open (Text_File,
Text_IO.Append_File,
TC_Wrong_Filename);
Report.Failed ("Exception not raised by improper Open - 2");
-- An exception handler for the Name_Error, present within the application,
-- catches the exception and processing continues.
exception
when Text_IO.Name_Error =>
TC_Errors := TC_Errors + 1;
when others =>
Report.Failed("Exception in Open processing - 2");
end Open_With_Wrong_Filename;
if (TC_Errors /= TC_Number_Of_Forced_Errors) then
Report.Failed ("Incorrect number of exceptions handled");
end if;
end Operational_Test_Block;
Deletion:
begin
-- 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;
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 CXAA015;
|
