| -- CXA8002.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 resetting a file using mode Append_File allows for the |
| -- writing of elements to the file starting after the last element in |
| -- the file. |
| -- Check that the result of function Name can be used on a subsequent |
| -- reopen of the file. |
| -- Check that a mode change occurs on reset of a file to/from mode |
| -- Append_File. |
| -- |
| -- TEST DESCRIPTION: |
| -- This test simulates the read/write of data from/to an individual |
| -- sequential file. New data can be appended to the end of the existing |
| -- file, and the same file can be reset to allow reading of data from |
| -- the file. This process can occur multiple times. |
| -- When the mode of the file is changed with a Reset, the current mode |
| -- value assigned to the file is checked using the result of function |
| -- Mode. This, in conjunction with the read/write operations, verifies |
| -- that a mode change has taken place on Reset. |
| -- |
| -- An expected common usage of the scenarios found in this test would |
| -- be a case where a single data file is kept open continuously, being |
| -- reset for read/append of data. For systems that do not support a |
| -- direct form of I/O, this would allow for efficient use of a sequential |
| -- I/O file. |
| -- |
| -- APPLICABILITY CRITERIA: |
| -- Applicable to all systems capable of supporting IO operations on |
| -- external Sequential_IO files. |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- 19 Feb 97 PWB.CTA Fixed handling for file non-support and Reset |
| -- non-support. |
| --! |
| |
| with Sequential_IO; |
| with Report; |
| |
| procedure CXA8002 is |
| subtype Employee_Data is String (1 .. 11); |
| package Data_IO is new Sequential_IO (Employee_Data); |
| |
| Employee_Data_File : Data_IO.File_Type; |
| Employee_Filename : constant String := |
| Report.Legal_File_Name (Nam => "CXA8002"); |
| |
| Incomplete : exception; |
| |
| begin |
| |
| Report.Test ("CXA8002", "Check that resetting a file using mode " & |
| "Append_File allows for the writing of " & |
| "elements to the file starting after the " & |
| "last element in the file"); |
| |
| Test_for_Sequential_IO_Support: |
| begin |
| |
| -- An implementation that does not support Sequential_IO in a particular |
| -- environment will raise Use_Error or Name_Error on calls to various |
| -- Sequential_IO operations. This block statement encloses a call to |
| -- Create, which should produce an exception in a non-supportive |
| -- environment. These exceptions will be handled to produce a |
| -- Not_Applicable result. |
| |
| Data_IO.Create (File => Employee_Data_File, -- Create file in |
| Mode => Data_IO.Append_File, -- mode Append_File. |
| Name => Employee_Filename); |
| |
| -- |
| -- The following portion of code demonstrates the fact that a sequential |
| -- file can be created in Append_File mode, and that data can be written |
| -- to the file. |
| -- |
| |
| exception |
| when Data_IO.Use_Error | Data_IO.Name_Error => |
| Report.Not_Applicable |
| ( "Sequential files not supported - Create as Append_File"); |
| raise Incomplete; |
| end Test_for_Sequential_IO_Support; |
| Operational_Test_Block: |
| declare |
| Blank_Data : constant Employee_Data := " "; |
| Employee_1 : constant Employee_Data := "123-45-6789"; |
| Employee_2 : Employee_Data := "987-65-4321"; |
| |
| -- Note: Artificial numerical data chosen above to prevent any |
| -- unintended similarity with persons alive or dead. |
| |
| TC_Employee_Data : Employee_Data := Blank_Data; |
| |
| |
| function TC_Mode_Selection (Selector : Integer) |
| return Data_IO.File_Mode is |
| begin |
| case Report.Ident_Int(Selector) is |
| when 1 => return Data_IO.In_File; |
| when 2 => return Data_IO.Out_File; |
| when others => return Data_IO.Append_File; |
| end case; |
| end TC_Mode_Selection; |
| |
| Employee_Filename : constant String := -- Use function Name to |
| Data_IO.Name (File => Employee_Data_File); -- store filename in |
| -- string variable. |
| begin |
| |
| Data_IO.Write (File => Employee_Data_File, -- Write initial data |
| Item => Employee_1); -- entry to file. |
| |
| -- |
| -- The following portion of code demonstrates that a sequential file |
| -- can be reset to various file modes, including Append_File mode, |
| -- allowing data to be added to the end of the file. |
| -- |
| begin |
| Data_IO.Reset (File => Employee_Data_File, -- Reset file with |
| Mode => Data_IO.In_File); -- mode In_File. |
| exception |
| when Data_IO.Use_Error => |
| Report.Not_Applicable |
| ("Reset to In_File not supported for Sequential_IO"); |
| raise Incomplete; |
| when others => |
| Report.Failed |
| ("Unexpected exception on Reset to In_File (Sequential_IO)"); |
| raise Incomplete; |
| end; |
| if Data_IO."="(Data_IO.Mode (Employee_Data_File), |
| TC_Mode_Selection (1)) then -- Compare In_File mode |
| -- Reset successful, |
| Data_IO.Read (File => Employee_Data_File, -- now verify file data. |
| Item => TC_Employee_Data); |
| |
| if ((TC_Employee_Data (1 .. 7) /= "123-45-") or |
| (TC_Employee_Data (5 .. 11) /= "45-6789")) then |
| Report.Failed ("Data read error"); |
| end if; |
| |
| else |
| Report.Failed ("File mode not changed by Reset"); |
| end if; |
| |
| -- |
| -- Simulate appending data to a file that has previously been written |
| -- to and read from. |
| -- |
| begin |
| Data_IO.Reset (File => Employee_Data_File, -- Reset file with |
| Mode => Data_IO.Append_File); -- mode Append_File. |
| exception |
| when Data_IO.Use_Error => |
| Report.Not_Applicable |
| ("Reset to Append_File not supported for Sequential_IO"); |
| raise Incomplete; |
| when others => |
| Report.Failed |
| ("Unexpected exception on Reset to Append_File (Sequential_IO)"); |
| raise Incomplete; |
| end; |
| |
| if Data_IO.Is_Open (Employee_Data_File) then -- File remains open |
| -- following Reset to |
| -- Append_File mode? |
| |
| if Data_IO."=" (Data_IO.Mode (Employee_Data_File), |
| TC_Mode_Selection (3)) then -- Compare to |
| -- Append_File mode. |
| Data_IO.Write (File => Employee_Data_File, -- Write additional |
| Item => Employee_2); -- data to file. |
| else |
| Report.Failed ("File mode not changed by Reset"); |
| end if; |
| |
| else |
| Report.Failed |
| ("File status not Open following Reset to Append mode"); |
| end if; |
| |
| Data_IO.Close (Employee_Data_File); |
| |
| |
| Test_Verification_Block: |
| begin |
| |
| Data_IO.Open (File => Employee_Data_File, -- Reopen file, using |
| Mode => Data_IO.In_File, -- previous result of |
| Name => Employee_Filename); -- function Name. |
| |
| TC_Employee_Data := Blank_Data; -- Clear record field. |
| Data_IO.Read (Employee_Data_File, -- Read first record, |
| TC_Employee_Data); -- check ordering of |
| -- records. |
| |
| if not ((TC_Employee_Data (1 .. 3) = "123") and then |
| (TC_Employee_Data (4 .. 11) = "-45-6789")) then |
| Report.Failed ("Data read error - first record"); |
| end if; |
| |
| TC_Employee_Data := Blank_Data; -- Clear record field. |
| Data_IO.Read (Employee_Data_File, -- Read second record, |
| TC_Employee_Data); -- check for ordering of |
| -- records. |
| |
| if ((TC_Employee_Data (1 .. 6) /= "987-65") or else |
| not (TC_Employee_Data (3 .. 11) = "7-65-4321")) then |
| Report.Failed ("Data read error - second record"); |
| end if; |
| |
| -- Check that only two items were written to the file. |
| if not Data_IO.End_Of_File(Employee_Data_File) then |
| Report.Failed("Incorrect number of records in file"); |
| end if; |
| |
| exception |
| |
| when Data_IO.End_Error => -- If two items not in |
| -- file (data overwritten), |
| -- then fail. |
| Report.Failed ("Incorrect number of record elements in file"); |
| |
| when others => |
| Report.Failed ("Error raised during data verification"); |
| |
| end Test_Verification_Block; |
| |
| exception |
| |
| when others => |
| Report.Failed("Exception raised during Sequential_IO processing"); |
| |
| end Operational_Test_Block; |
| |
| Final_Block: |
| begin |
| -- Check that file is open prior to deleting it. |
| if Data_IO.Is_Open(Employee_Data_File) then |
| Data_IO.Delete (Employee_Data_File); |
| else |
| Data_IO.Open(Employee_Data_File, |
| Data_IO.In_File, |
| Employee_Filename); |
| Data_IO.Delete (Employee_Data_File); |
| end if; |
| exception |
| when others => |
| Report.Failed ("Sequential_IO Delete not properly supported"); |
| end Final_Block; |
| |
| Report.Result; |
| |
| exception |
| when Incomplete => |
| Report.Result; |
| when others => |
| Report.Failed ("Unexpected exception"); |
| Report.Result; |
| end CXA8002; |
