gcc/ada/libgnat/a-siocst.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --          A D A . S E Q U E N T I A L _ I O . C _ S T R E A M S           --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2019, 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 Interfaces.C_Streams; use Interfaces.C_Streams;
  33 with System.File_IO;
  34 with System.File_Control_Block;
  35 with System.Sequential_IO;
  36 with Ada.Unchecked_Conversion;
  37
  38 package body Ada.Sequential_IO.C_Streams is
  39
  40    package FIO renames System.File_IO;
  41    package FCB renames System.File_Control_Block;
  42    package SIO renames System.Sequential_IO;
  43
  44    subtype AP is FCB.AFCB_Ptr;
  45
  46    function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
  47
  48    --------------
  49    -- C_Stream --
  50    --------------
  51
  52    function C_Stream (F : File_Type) return FILEs is
  53    begin
  54       FIO.Check_File_Open (AP (F));
  55       return F.Stream;
  56    end C_Stream;
  57
  58    ----------
  59    -- Open --
  60    ----------
  61
  62    procedure Open
  63      (File     : in out File_Type;
  64       Mode     : File_Mode;
  65       C_Stream : FILEs;
  66       Form     : String := "";
  67       Name     : String := "")
  68    is
  69       Dummy_File_Control_Block : SIO.Sequential_AFCB;
  70       pragma Warnings (Off, Dummy_File_Control_Block);
  71       --  Yes, we know this is never assigned a value, only the tag
  72       --  is used for dispatching purposes, so that's expected.
  73
  74    begin
  75       FIO.Open (File_Ptr  => AP (File),
  76                 Dummy_FCB => Dummy_File_Control_Block,
  77                 Mode      => To_FCB (Mode),
  78                 Name      => Name,
  79                 Form      => Form,
  80                 Amethod   => 'Q',
  81                 Creat     => False,
  82                 Text      => False,
  83                 C_Stream  => C_Stream);
  84    end Open;
  85
  86 end Ada.Sequential_IO.C_Streams;