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|
-- CXAA013.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 skip a line or page using the predefined Skip_Line and Skip_Page
-- procedures 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, which
-- results in the raising of a Mode_Error exception.
-- 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 CXAA013 is
use Ada;
Text_File : Text_IO.File_Type;
Text_Filename : constant String :=
Report.Legal_File_Name ( Nam => "CXAA013" );
Incomplete : exception;
begin
Report.Test ("CXAA013", "Check that the exception Mode_Error is " &
"raised when an attempt is made to skip " &
"a line or page using the predefined " &
"Skip_Line and Skip_Page procedures on " &
"a text file with 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.
Text_IO.Put_Line (Text_File, "Data entered into the file");
Operational_Test_Block:
declare
TC_Number_Of_Forced_Mode_Errors : constant Natural := 2;
TC_Mode_Errors : Natural := 0;
begin
Test_for_Skip_Line:
declare
TC_Spacing : constant Text_IO.Count := 3;
begin
-- During the course of its processing, the application may attempt to
-- invoke the Skip_Line procedure on a file that is currently in Append_File
-- mode (instead of the anticipated In_File mode). This results in the
-- raising of Mode_Error.
Text_IO.Skip_Line (Text_File, TC_Spacing);
Report.Failed ("Exception not raised by Skip_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 Skip_Line processing");
end Test_for_Skip_Line;
Test_for_Skip_Page:
begin
-- Again, during the course of its processing, the application incorrectly
-- assumes that the file mode is In_File, this time attempting to call the
-- Skip_Page procedure for the file (that is currently in Append_File mode).
Text_IO.Skip_Page (Text_File);
Report.Failed ("Exception not raised by Skip_Page");
-- 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 Skip_Page processing");
end Test_for_Skip_Page;
if (TC_Mode_Errors /= TC_Number_Of_Forced_Mode_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 CXAA013;
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