1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . D I R E C T _ I O --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the contents of the part following the private keyword. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Ada.IO_Exceptions;
with System.Direct_IO;
with Interfaces.C_Streams;
generic
type Element_Type is private;
package Ada.Direct_IO is
pragma Compile_Time_Warning
(Element_Type'Has_Access_Values,
"Element_Type for Direct_IO instance has access values");
pragma Compile_Time_Warning
(Element_Type'Has_Tagged_Values,
"Element_Type for Direct_IO instance has tagged values");
type File_Type is limited private;
type File_Mode is (In_File, Inout_File, Out_File);
-- The following representation clause allows the use of unchecked
-- conversion for rapid translation between the File_Mode type
-- used in this package and System.File_IO.
for File_Mode use
(In_File => 0, -- System.File_IO.File_Mode'Pos (In_File)
Inout_File => 1, -- System.File_IO.File_Mode'Pos (Inout_File);
Out_File => 2); -- System.File_IO.File_Mode'Pos (Out_File)
type Count is range 0 .. System.Direct_IO.Count'Last;
subtype Positive_Count is Count range 1 .. Count'Last;
---------------------
-- File Management --
---------------------
procedure Create
(File : in out File_Type;
Mode : File_Mode := Inout_File;
Name : String := "";
Form : String := "");
procedure Open
(File : in out File_Type;
Mode : File_Mode;
Name : String;
Form : String := "");
procedure Close (File : in out File_Type);
procedure Delete (File : in out File_Type);
procedure Reset (File : in out File_Type; Mode : File_Mode);
procedure Reset (File : in out File_Type);
function Mode (File : File_Type) return File_Mode;
function Name (File : File_Type) return String;
function Form (File : File_Type) return String;
function Is_Open (File : File_Type) return Boolean;
procedure Flush (File : File_Type);
---------------------------------
-- Input and Output Operations --
---------------------------------
procedure Read
(File : File_Type;
Item : out Element_Type;
From : Positive_Count);
procedure Read
(File : File_Type;
Item : out Element_Type);
procedure Write
(File : File_Type;
Item : Element_Type;
To : Positive_Count);
procedure Write
(File : File_Type;
Item : Element_Type);
procedure Set_Index (File : File_Type; To : Positive_Count);
function Index (File : File_Type) return Positive_Count;
function Size (File : File_Type) return Count;
function End_Of_File (File : File_Type) return Boolean;
----------------
-- Exceptions --
----------------
Status_Error : exception renames IO_Exceptions.Status_Error;
Mode_Error : exception renames IO_Exceptions.Mode_Error;
Name_Error : exception renames IO_Exceptions.Name_Error;
Use_Error : exception renames IO_Exceptions.Use_Error;
Device_Error : exception renames IO_Exceptions.Device_Error;
End_Error : exception renames IO_Exceptions.End_Error;
Data_Error : exception renames IO_Exceptions.Data_Error;
private
-- The following procedures have a File_Type formal of mode IN OUT because
-- they may close the original file. The Close operation may raise an
-- exception, but in that case we want any assignment to the formal to
-- be effective anyway, so it must be passed by reference (or the caller
-- will be left with a dangling pointer).
pragma Export_Procedure
(Internal => Close,
External => "",
Mechanism => Reference);
pragma Export_Procedure
(Internal => Delete,
External => "",
Mechanism => Reference);
pragma Export_Procedure
(Internal => Reset,
External => "",
Parameter_Types => (File_Type),
Mechanism => Reference);
pragma Export_Procedure
(Internal => Reset,
External => "",
Parameter_Types => (File_Type, File_Mode),
Mechanism => (File => Reference));
type File_Type is new System.Direct_IO.File_Type;
Bytes : constant Interfaces.C_Streams.size_t :=
Interfaces.C_Streams.size_t'Max
(1, Element_Type'Max_Size_In_Storage_Elements);
-- Size of an element in storage units. The Max operation here is to ensure
-- that we allocate a single byte for zero-sized elements. It's a bit weird
-- to instantiate Direct_IO with zero sized elements, but it is legal and
-- this adjustment ensures that we don't get anomalous behavior.
pragma Inline (Close);
pragma Inline (Create);
pragma Inline (Delete);
pragma Inline (End_Of_File);
pragma Inline (Form);
pragma Inline (Index);
pragma Inline (Is_Open);
pragma Inline (Mode);
pragma Inline (Name);
pragma Inline (Open);
pragma Inline (Read);
pragma Inline (Reset);
pragma Inline (Set_Index);
pragma Inline (Size);
pragma Inline (Write);
end Ada.Direct_IO;
|
