gomp-20050608-branch/gcc/testsuite/ada/acats/tests/cxa/cxaa014.a

   1 -- CXAA014.A
   2 --
   3 --                             Grant of Unlimited Rights
   4 --
   5 --     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
   6 --     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
   7 --     unlimited rights in the software and documentation contained herein.
   8 --     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
   9 --     this public release, the Government intends to confer upon all
  10 --     recipients unlimited rights  equal to those held by the Government.
  11 --     These rights include rights to use, duplicate, release or disclose the
  12 --     released technical data and computer software in whole or in part, in
  13 --     any manner and for any purpose whatsoever, and to have or permit others
  14 --     to do so.
  15 --
  16 --                                    DISCLAIMER
  17 --
  18 --     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
  19 --     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
  20 --     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
  21 --     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
  22 --     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
  23 --     PARTICULAR PURPOSE OF SAID MATERIAL.
  24 --*
  25 --
  26 -- OBJECTIVE:
  27 --      Check that the exception Mode_Error is raised when an attempt is made
  28 --      to check for the end of a line or page using the predefined functions
  29 --      End_Of_Line or End_Of_Page on a text file with mode Append_File.
  30 --
  31 -- TEST DESCRIPTION:
  32 --      A scenario is created that demonstrates the potential for the
  33 --      incorrect usage of predefined text processing subprograms, which
  34 --      results in the raising of a Mode_Error exception.
  35 --      A count is kept to ensure that each anticipated exception is in fact
  36 --      raised and handled properly.
  37 --
  38 -- APPLICABILITY CRITERIA:
  39 --      This test is applicable only to implementations that support text
  40 --      files.
  41 --
  42 --
  43 -- CHANGE HISTORY:
  44 --      06 Dec 94   SAIC    ACVC 2.0
  45 --      28 Feb 97   PWB.CTA Allowed for non-support of some IO operations
  46 --!
  47
  48 with Ada.Text_IO;
  49 with Report;
  50
  51 procedure CXAA014 is
  52    use Ada;
  53    Text_File     : Text_IO.File_Type;
  54    Text_Filename : constant String :=
  55                               Report.Legal_File_Name ( Nam => "CXAA014" );
  56    Incomplete : exception;
  57
  58 begin
  59
  60          Report.Test ("CXAA014", "Check that the exception Mode_Error is "  &
  61                                  "raised when an attempt is made to check " &
  62                                  "for the end of a line or page using the " &
  63                                  "predefined functions End_Of_Line or "     &
  64                                  "End_Of_Page on a text file with mode "    &
  65                                  "Append_File");
  66
  67          Test_for_Text_IO_Support:
  68          begin
  69
  70 -- Use_Error will be raised if Text_IO operations or external files are not
  71 -- supported.
  72
  73             Text_IO.Create (Text_File, Text_IO.Out_File, Text_Filename);
  74
  75    exception
  76
  77        when Text_IO.Use_Error | Text_IO.Name_Error =>
  78           Report.Not_Applicable
  79              ( "Files not supported - Create as Out_File for Text_IO" );
  80           raise Incomplete;
  81
  82    end Test_for_Text_IO_Support;
  83
  84
  85 -- The application writes some amount of data to the file.
  86
  87             for I in 1 .. 10 loop
  88                Text_IO.Put_Line (Text_File, "Data entered into the file");
  89             end loop;
  90
  91             Text_IO.Close (Text_File);
  92
  93             Operational_Test_Block:
  94             declare
  95                TC_Number_Of_Forced_Mode_Errors : constant Natural := 2;
  96                TC_Mode_Errors : Natural := 0;
  97             begin
  98
  99                Text_IO.Open (Text_File, Text_IO.Append_File, Text_Filename);
 100
 101                Test_for_End_Of_Line:
 102                declare
 103                   TC_End_Of_Line : Boolean;
 104                begin
 105
 106 -- During the course of its processing, the application may attempt to
 107 -- invoke the End_Of_Line function on a file that is currently in Append_File
 108 -- mode (instead of the anticipated In_File mode).  This results in the
 109 -- raising of Mode_Error.
 110
 111                   TC_End_Of_Line := Text_IO.End_Of_Line (Text_File);
 112                   Report.Failed ("Exception not raised by End_Of_Line");
 113
 114 -- An exception handler present within the application handles the exception
 115 -- and processing can continue.
 116
 117                exception
 118                   when Text_IO.Mode_Error =>
 119                      TC_Mode_Errors := TC_Mode_Errors + 1;
 120                   when others =>
 121                      Report.Failed("Exception in End_Of_Line processing");
 122                end Test_for_End_Of_Line;
 123
 124
 125                Test_for_End_Of_Page:
 126                declare
 127                   TC_End_Of_Page : Boolean;
 128                begin
 129
 130 -- Again, during the course of its processing, the application incorrectly
 131 -- assumes that the file mode is In_File, this time attempting to call the
 132 -- End_Of_Page function for the file (that is currently in Append_File mode).
 133
 134                   TC_End_Of_Page := Text_IO.End_Of_Page (Text_File);
 135                   Report.Failed ("Exception not raised by End_Of_Page");
 136
 137 -- Once again, an exception handler present within the application handles
 138 -- the exception and processing continues.
 139
 140                exception
 141                   when Text_IO.Mode_Error =>
 142                      TC_Mode_Errors := TC_Mode_Errors + 1;
 143                   when others =>
 144                      Report.Failed("Exception in End_Of_Page processing");
 145                end Test_for_End_Of_Page;
 146
 147
 148                if (TC_Mode_Errors /= TC_Number_Of_Forced_Mode_Errors) then
 149                   Report.Failed ("Incorrect number of exceptions handled");
 150                end if;
 151
 152             end Operational_Test_Block;
 153
 154             Deletion:
 155             begin
 156                -- Delete the external file.
 157                if Text_IO.Is_Open (Text_File) then
 158                   Text_IO.Delete (Text_File);
 159                else
 160                   Text_IO.Open (Text_File, Text_IO.In_File, Text_Filename);
 161                   Text_IO.Delete (Text_File);
 162                end if;
 163             exception
 164                when others =>
 165                   Report.Failed
 166                      ( "Delete not properly implemented for Text_IO" );
 167             end Deletion;
 168
 169          Report.Result;
 170
 171 exception
 172    when Incomplete =>
 173       Report.Result;
 174    when others     =>
 175       Report.Failed ( "Unexpected exception" );
 176       Report.Result;
 177
 178 end CXAA014;