gcc/ada/s-sequio.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME 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 --          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 with System.File_IO;
  33 with Ada.Unchecked_Deallocation;
  34
  35 package body System.Sequential_IO is
  36
  37    subtype AP is FCB.AFCB_Ptr;
  38
  39    package FIO renames System.File_IO;
  40
  41    -------------------
  42    -- AFCB_Allocate --
  43    -------------------
  44
  45    function AFCB_Allocate
  46      (Control_Block : Sequential_AFCB) return FCB.AFCB_Ptr
  47    is
  48       pragma Warnings (Off, Control_Block);
  49
  50    begin
  51       return new Sequential_AFCB;
  52    end AFCB_Allocate;
  53
  54    ----------------
  55    -- AFCB_Close --
  56    ----------------
  57
  58    --  No special processing required for Sequential_IO close
  59
  60    procedure AFCB_Close (File : not null access Sequential_AFCB) is
  61       pragma Warnings (Off, File);
  62
  63    begin
  64       null;
  65    end AFCB_Close;
  66
  67    ---------------
  68    -- AFCB_Free --
  69    ---------------
  70
  71    procedure AFCB_Free (File : not null access Sequential_AFCB) is
  72
  73       type FCB_Ptr is access all Sequential_AFCB;
  74
  75       FT : FCB_Ptr := FCB_Ptr (File);
  76
  77       procedure Free is new
  78         Ada.Unchecked_Deallocation (Sequential_AFCB, FCB_Ptr);
  79
  80    begin
  81       Free (FT);
  82    end AFCB_Free;
  83
  84    ------------
  85    -- Create --
  86    ------------
  87
  88    procedure Create
  89      (File : in out File_Type;
  90       Mode : FCB.File_Mode := FCB.Out_File;
  91       Name : String := "";
  92       Form : String := "")
  93    is
  94       Dummy_File_Control_Block : Sequential_AFCB;
  95       pragma Warnings (Off, Dummy_File_Control_Block);
  96       --  Yes, we know this is never assigned a value, only the tag
  97       --  is used for dispatching purposes, so that's expected.
  98
  99    begin
 100       FIO.Open (File_Ptr  => AP (File),
 101                 Dummy_FCB => Dummy_File_Control_Block,
 102                 Mode      => Mode,
 103                 Name      => Name,
 104                 Form      => Form,
 105                 Amethod   => 'Q',
 106                 Creat     => True,
 107                 Text      => False);
 108    end Create;
 109
 110    ----------
 111    -- Open --
 112    ----------
 113
 114    procedure Open
 115      (File : in out File_Type;
 116       Mode : FCB.File_Mode;
 117       Name : String;
 118       Form : String := "")
 119    is
 120       Dummy_File_Control_Block : Sequential_AFCB;
 121       pragma Warnings (Off, Dummy_File_Control_Block);
 122       --  Yes, we know this is never assigned a value, only the tag
 123       --  is used for dispatching purposes, so that's expected.
 124
 125    begin
 126       FIO.Open (File_Ptr  => AP (File),
 127                 Dummy_FCB => Dummy_File_Control_Block,
 128                 Mode      => Mode,
 129                 Name      => Name,
 130                 Form      => Form,
 131                 Amethod   => 'Q',
 132                 Creat     => False,
 133                 Text      => False);
 134    end Open;
 135
 136    ----------
 137    -- Read --
 138    ----------
 139
 140    --  Not used, since Sequential_IO files are not used as streams
 141
 142    procedure Read
 143      (File : in out Sequential_AFCB;
 144       Item : out Ada.Streams.Stream_Element_Array;
 145       Last : out Ada.Streams.Stream_Element_Offset)
 146    is
 147    begin
 148       raise Program_Error;
 149    end Read;
 150
 151    -----------
 152    -- Write --
 153    -----------
 154
 155    --  Not used, since Sequential_IO files are not used as streams
 156
 157    procedure Write
 158      (File : in out Sequential_AFCB;
 159       Item : Ada.Streams.Stream_Element_Array)
 160    is
 161    begin
 162       raise Program_Error;
 163    end Write;
 164
 165 end System.Sequential_IO;