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|
-- CXAA012.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 Mode_Error is raised when an attempt is made
-- to read from (perform a Get_Line) or use the predefined End_Of_File
-- function on a text file with mode Append_File.
--
-- TEST DESCRIPTION:
-- A scenario is created that demonstrates the potential for the
-- incorrect usage of predefined text processing subprograms, resulting
-- from their use with files of the wrong Mode. This results in the
-- raising of Mode_Error exceptions, which is handled within blocks
-- embedded in the test.
-- 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
-- 27 Feb 97 PWB.CTA Allowed for non-support of some IO operations
--!
with Ada.Text_IO;
with Report;
procedure CXAA012 is
use Ada;
Text_File : Text_IO.File_Type;
Text_Filename : constant String :=
Report.Legal_File_Name ( Nam => "CXAA012" );
Incomplete : exception;
begin
Report.Test ("CXAA012", "Check that the exception Mode_Error is " &
"raised when an attempt is made to read " &
"from (perform a Get_Line) or use the " &
"predefined End_Of_File function on a " &
"text file with mode Append_File");
Test_for_Text_IO_Support:
begin
-- Use_Error or Name_Error will be raised if Text_IO operations
-- or external files are not supported.
Text_IO.Create (Text_File, Text_IO.Out_File, Text_Filename);
exception
when Text_IO.Use_Error | Text_IO.Name_Error =>
Report.Not_Applicable
( "Files not supported - Create as Out_File for Text_IO" );
raise Incomplete;
end Test_for_Text_IO_Support;
-- The application writes some amount of data to the file.
Text_IO.Put_Line (Text_File, "Data entered into the file");
Text_IO.Close (Text_File);
Operational_Test_Block:
declare
TC_Number_Of_Forced_Mode_Errors : constant Natural := 2;
TC_Mode_Errors : Natural := 0;
begin
Text_IO.Open (Text_File, Text_IO.Append_File, Text_Filename);
Test_for_Reading:
declare
TC_Data : String (1..80);
TC_Length : Natural := 0;
begin
-- During the course of its processing, the application may become confused
-- and erroneously attempt to read data from the file that is currently in
-- Append_File mode (instead of the anticipated In_File mode).
-- This would result in the raising of Mode_Error.
Text_IO.Get_Line (Text_File, TC_Data, TC_Length);
Report.Failed ("Exception not raised by Get_Line");
-- An exception handler present within the application handles the exception
-- and processing can continue.
exception
when Text_IO.Mode_Error =>
TC_Mode_Errors := TC_Mode_Errors + 1;
when others =>
Report.Failed ("Exception in Get_Line processing");
end Test_for_Reading;
Test_for_End_Of_File:
declare
TC_End_Of_File : Boolean;
begin
-- Again, during the course of its processing, the application attempts to
-- call the End_Of_File function for the file that is currently in
-- Append_File mode (instead of the anticipated In_File mode).
TC_End_Of_File := Text_IO.End_Of_File (Text_File);
Report.Failed ("Exception not raised by End_Of_File");
-- Once again, an exception handler present within the application handles
-- the exception and processing continues.
exception
when Text_IO.Mode_Error =>
TC_Mode_Errors := TC_Mode_Errors + 1;
when others =>
Report.Failed("Exception in End_Of_File processing");
end Test_for_End_Of_File;
if (TC_Mode_Errors /= TC_Number_Of_Forced_Mode_Errors) then
Report.Failed ("Incorrect number of exceptions handled");
end if;
end Operational_Test_Block;
-- 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;
Report.Result;
exception
when Incomplete =>
Report.Result;
when others =>
Report.Failed ( "Unexpected exception" );
Report.Result;
end CXAA012;
|
