1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                    A D A . S E Q U E N T I A L _ I O                     --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2018, Free Software Foundation, Inc.         --
10--                                                                          --
11-- This specification is derived from the Ada Reference Manual for use with --
12-- GNAT. The copyright notice above, and the license provisions that follow --
13-- apply solely to the  contents of the part following the private keyword. --
14--                                                                          --
15-- GNAT is free software;  you can  redistribute it  and/or modify it under --
16-- terms of the  GNU General Public License as published  by the Free Soft- --
17-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
18-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
19-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
20-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
21--                                                                          --
22-- As a special exception under Section 7 of GPL version 3, you are granted --
23-- additional permissions described in the GCC Runtime Library Exception,   --
24-- version 3.1, as published by the Free Software Foundation.               --
25--                                                                          --
26-- You should have received a copy of the GNU General Public License and    --
27-- a copy of the GCC Runtime Library Exception along with this program;     --
28-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
29-- <http://www.gnu.org/licenses/>.                                          --
30--                                                                          --
31-- GNAT was originally developed  by the GNAT team at  New York University. --
32-- Extensive contributions were provided by Ada Core Technologies Inc.      --
33--                                                                          --
34------------------------------------------------------------------------------
35
36with Ada.IO_Exceptions;
37
38with System.Sequential_IO;
39
40generic
41   type Element_Type (<>) is private;
42
43package Ada.Sequential_IO is
44
45   pragma Compile_Time_Warning
46     (Element_Type'Has_Access_Values,
47      "Element_Type for Sequential_IO instance has access values");
48
49   pragma Compile_Time_Warning
50     (Element_Type'Has_Tagged_Values,
51      "Element_Type for Sequential_IO instance has tagged values");
52
53   type File_Type is limited private with Default_Initial_Condition;
54
55   type File_Mode is (In_File, Out_File, Append_File);
56
57   --  The following representation clause allows the use of unchecked
58   --  conversion for rapid translation between the File_Mode type
59   --  used in this package and System.File_IO.
60
61   for File_Mode use
62     (In_File     => 0,  -- System.File_IO.File_Mode'Pos (In_File)
63      Out_File    => 2,  -- System.File_IO.File_Mode'Pos (Out_File)
64      Append_File => 3); -- System.File_IO.File_Mode'Pos (Append_File)
65
66   ---------------------
67   -- File management --
68   ---------------------
69
70   procedure Create
71     (File : in out File_Type;
72      Mode : File_Mode := Out_File;
73      Name : String := "";
74      Form : String := "");
75
76   procedure Open
77     (File : in out File_Type;
78      Mode : File_Mode;
79      Name : String;
80      Form : String := "");
81
82   procedure Close  (File : in out File_Type);
83   procedure Delete (File : in out File_Type);
84   procedure Reset  (File : in out File_Type; Mode : File_Mode);
85   procedure Reset  (File : in out File_Type);
86
87   function Mode    (File : File_Type) return File_Mode;
88   function Name    (File : File_Type) return String;
89   function Form    (File : File_Type) return String;
90
91   function Is_Open (File : File_Type) return Boolean;
92
93   procedure Flush (File : File_Type);
94
95   ---------------------------------
96   -- Input and output operations --
97   ---------------------------------
98
99   procedure Read  (File : File_Type; Item : out Element_Type);
100   procedure Write (File : File_Type; Item : Element_Type);
101
102   function End_Of_File (File : File_Type) return Boolean;
103
104   ----------------
105   -- Exceptions --
106   ----------------
107
108   Status_Error : exception renames IO_Exceptions.Status_Error;
109   Mode_Error   : exception renames IO_Exceptions.Mode_Error;
110   Name_Error   : exception renames IO_Exceptions.Name_Error;
111   Use_Error    : exception renames IO_Exceptions.Use_Error;
112   Device_Error : exception renames IO_Exceptions.Device_Error;
113   End_Error    : exception renames IO_Exceptions.End_Error;
114   Data_Error   : exception renames IO_Exceptions.Data_Error;
115
116private
117
118   --  The following procedures have a File_Type formal of mode IN OUT because
119   --  they may close the original file. The Close operation may raise an
120   --  exception, but in that case we want any assignment to the formal to
121   --  be effective anyway, so it must be passed by reference (or the caller
122   --  will be left with a dangling pointer).
123
124   pragma Export_Procedure
125     (Internal  => Close,
126      External  => "",
127      Mechanism => Reference);
128   pragma Export_Procedure
129     (Internal  => Delete,
130      External  => "",
131      Mechanism => Reference);
132   pragma Export_Procedure
133     (Internal        => Reset,
134      External        => "",
135      Parameter_Types => (File_Type),
136      Mechanism       => Reference);
137   pragma Export_Procedure
138     (Internal        => Reset,
139      External        => "",
140      Parameter_Types => (File_Type, File_Mode),
141      Mechanism       => (File => Reference));
142
143   type File_Type is new System.Sequential_IO.File_Type;
144
145   --  All subprograms are inlined
146
147   pragma Inline (Close);
148   pragma Inline (Create);
149   pragma Inline (Delete);
150   pragma Inline (End_Of_File);
151   pragma Inline (Form);
152   pragma Inline (Is_Open);
153   pragma Inline (Mode);
154   pragma Inline (Name);
155   pragma Inline (Open);
156   pragma Inline (Read);
157   pragma Inline (Reset);
158   pragma Inline (Write);
159
160end Ada.Sequential_IO;
161