File : a-diocst.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- A D A . D I R E C T _ I O . C _ S T R E A M S --
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 -- --
19 -- --
20 -- --
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.Direct_IO;
36 with Ada.Unchecked_Conversion;
37
38 package body Ada.Direct_IO.C_Streams is
39
40 package FIO renames System.File_IO;
41 package FCB renames System.File_Control_Block;
42 package DIO renames System.Direct_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 : DIO.Direct_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 => 'D',
81 Creat => False,
82 Text => False,
83 C_Stream => C_Stream);
84
85 File.Bytes := Bytes;
86 end Open;
87
88 end Ada.Direct_IO.C_Streams;