gcc/ada/s-sequio.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                 S Y S T E M . S E Q U E N T I A L _ I O                  --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.7 $                              --
  10 --                                                                          --
  11 --          Copyright (C) 1992-1998 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with System.File_IO;
  37 with Unchecked_Deallocation;
  38
  39 package body System.Sequential_IO is
  40
  41    subtype AP is FCB.AFCB_Ptr;
  42
  43    package FIO renames System.File_IO;
  44
  45    -------------------
  46    -- AFCB_Allocate --
  47    -------------------
  48
  49    function AFCB_Allocate
  50      (Control_Block : Sequential_AFCB)
  51       return          FCB.AFCB_Ptr
  52    is
  53    begin
  54       return new Sequential_AFCB;
  55    end AFCB_Allocate;
  56
  57    ----------------
  58    -- AFCB_Close --
  59    ----------------
  60
  61    --  No special processing required for Sequential_IO close
  62
  63    procedure AFCB_Close (File : access Sequential_AFCB) is
  64    begin
  65       null;
  66    end AFCB_Close;
  67
  68    ---------------
  69    -- AFCB_Free --
  70    ---------------
  71
  72    procedure AFCB_Free (File : access Sequential_AFCB) is
  73
  74       type FCB_Ptr is access all Sequential_AFCB;
  75
  76       FT : FCB_Ptr := FCB_Ptr (File);
  77
  78       procedure Free is new
  79         Unchecked_Deallocation (Sequential_AFCB, FCB_Ptr);
  80
  81    begin
  82       Free (FT);
  83    end AFCB_Free;
  84
  85    ------------
  86    -- Create --
  87    ------------
  88
  89    procedure Create
  90      (File : in out File_Type;
  91       Mode : in FCB.File_Mode := FCB.Out_File;
  92       Name : in String := "";
  93       Form : in String := "")
  94    is
  95       File_Control_Block : Sequential_AFCB;
  96
  97    begin
  98       FIO.Open (File_Ptr  => AP (File),
  99                 Dummy_FCB => File_Control_Block,
 100                 Mode     => Mode,
 101                 Name     => Name,
 102                 Form     => Form,
 103                 Amethod  => 'Q',
 104                 Creat    => True,
 105                 Text     => False);
 106    end Create;
 107
 108    ----------
 109    -- Open --
 110    ----------
 111
 112    procedure Open
 113      (File : in out File_Type;
 114       Mode : in FCB.File_Mode;
 115       Name : in String;
 116       Form : in String := "")
 117    is
 118       File_Control_Block : Sequential_AFCB;
 119
 120    begin
 121       FIO.Open (File_Ptr  => AP (File),
 122                 Dummy_FCB => File_Control_Block,
 123                 Mode      => Mode,
 124                 Name      => Name,
 125                 Form      => Form,
 126                 Amethod   => 'Q',
 127                 Creat     => False,
 128                 Text      => False);
 129    end Open;
 130
 131    ----------
 132    -- Read --
 133    ----------
 134
 135    --  Not used, since Sequential_IO files are not used as streams
 136
 137    procedure Read
 138      (File : in out Sequential_AFCB;
 139       Item : out Ada.Streams.Stream_Element_Array;
 140       Last : out Ada.Streams.Stream_Element_Offset)
 141    is
 142    begin
 143       raise Program_Error;
 144    end Read;
 145
 146    -----------
 147    -- Write --
 148    -----------
 149
 150    --  Not used, since Sequential_IO files are not used as streams
 151
 152    procedure Write
 153      (File : in out Sequential_AFCB;
 154       Item : in Ada.Streams.Stream_Element_Array)
 155    is
 156    begin
 157       raise Program_Error;
 158    end Write;
 159
 160 end System.Sequential_IO;