-- 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;