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 --                                                                          --
  10 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with System.File_IO;
  36 with Unchecked_Deallocation;
  37
  38 package body System.Sequential_IO is
  39
  40    subtype AP is FCB.AFCB_Ptr;
  41
  42    package FIO renames System.File_IO;
  43
  44    -------------------
  45    -- AFCB_Allocate --
  46    -------------------
  47
  48    function AFCB_Allocate
  49      (Control_Block : Sequential_AFCB)
  50       return          FCB.AFCB_Ptr
  51    is
  52       pragma Warnings (Off, Control_Block);
  53
  54    begin
  55       return new Sequential_AFCB;
  56    end AFCB_Allocate;
  57
  58    ----------------
  59    -- AFCB_Close --
  60    ----------------
  61
  62    --  No special processing required for Sequential_IO close
  63
  64    procedure AFCB_Close (File : access Sequential_AFCB) is
  65       pragma Warnings (Off, File);
  66
  67    begin
  68       null;
  69    end AFCB_Close;
  70
  71    ---------------
  72    -- AFCB_Free --
  73    ---------------
  74
  75    procedure AFCB_Free (File : access Sequential_AFCB) is
  76
  77       type FCB_Ptr is access all Sequential_AFCB;
  78
  79       FT : FCB_Ptr := FCB_Ptr (File);
  80
  81       procedure Free is new
  82         Unchecked_Deallocation (Sequential_AFCB, FCB_Ptr);
  83
  84    begin
  85       Free (FT);
  86    end AFCB_Free;
  87
  88    ------------
  89    -- Create --
  90    ------------
  91
  92    procedure Create
  93      (File : in out File_Type;
  94       Mode : in FCB.File_Mode := FCB.Out_File;
  95       Name : in String := "";
  96       Form : in String := "")
  97    is
  98       File_Control_Block : Sequential_AFCB;
  99
 100    begin
 101       FIO.Open (File_Ptr  => AP (File),
 102                 Dummy_FCB => File_Control_Block,
 103                 Mode     => Mode,
 104                 Name     => Name,
 105                 Form     => Form,
 106                 Amethod  => 'Q',
 107                 Creat    => True,
 108                 Text     => False);
 109    end Create;
 110
 111    ----------
 112    -- Open --
 113    ----------
 114
 115    procedure Open
 116      (File : in out File_Type;
 117       Mode : in FCB.File_Mode;
 118       Name : in String;
 119       Form : in String := "")
 120    is
 121       File_Control_Block : Sequential_AFCB;
 122
 123    begin
 124       FIO.Open (File_Ptr  => AP (File),
 125                 Dummy_FCB => File_Control_Block,
 126                 Mode      => Mode,
 127                 Name      => Name,
 128                 Form      => Form,
 129                 Amethod   => 'Q',
 130                 Creat     => False,
 131                 Text      => False);
 132    end Open;
 133
 134    ----------
 135    -- Read --
 136    ----------
 137
 138    --  Not used, since Sequential_IO files are not used as streams
 139
 140    procedure Read
 141      (File : in out Sequential_AFCB;
 142       Item : out Ada.Streams.Stream_Element_Array;
 143       Last : out Ada.Streams.Stream_Element_Offset)
 144    is
 145    begin
 146       raise Program_Error;
 147    end Read;
 148
 149    -----------
 150    -- Write --
 151    -----------
 152
 153    --  Not used, since Sequential_IO files are not used as streams
 154
 155    procedure Write
 156      (File : in out Sequential_AFCB;
 157       Item : in Ada.Streams.Stream_Element_Array)
 158    is
 159    begin
 160       raise Program_Error;
 161    end Write;
 162
 163 end System.Sequential_IO;