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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . D I R E C T _ I O --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
-- This is the generic template for Direct_IO, i.e. the code that gets
-- duplicated. We absolutely minimize this code by either calling routines
-- in System.File_IO (for common file functions), or in System.Direct_IO
-- (for specialized Direct_IO functions)
with Interfaces.C_Streams; use Interfaces.C_Streams;
with System; use System;
with System.CRTL;
with System.File_Control_Block;
with System.File_IO;
with System.Direct_IO;
with System.Storage_Elements;
with Ada.Unchecked_Conversion;
use type System.Direct_IO.Count;
package body Ada.Direct_IO is
Zeroes : constant System.Storage_Elements.Storage_Array :=
(1 .. System.Storage_Elements.Storage_Offset (Bytes) => 0);
-- Buffer used to fill out partial records
package FCB renames System.File_Control_Block;
package FIO renames System.File_IO;
package DIO renames System.Direct_IO;
SU : constant := System.Storage_Unit;
subtype AP is FCB.AFCB_Ptr;
subtype FP is DIO.File_Type;
subtype DPCount is DIO.Positive_Count;
function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
function To_DIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
use type System.CRTL.size_t;
-----------
-- Close --
-----------
procedure Close (File : in out File_Type) is
begin
FIO.Close (AP (File)'Unrestricted_Access);
end Close;
------------
-- Create --
------------
procedure Create
(File : in out File_Type;
Mode : File_Mode := Inout_File;
Name : String := "";
Form : String := "")
is
begin
DIO.Create (FP (File), To_FCB (Mode), Name, Form);
File.Bytes := Bytes;
end Create;
------------
-- Delete --
------------
procedure Delete (File : in out File_Type) is
begin
FIO.Delete (AP (File)'Unrestricted_Access);
end Delete;
-----------------
-- End_Of_File --
-----------------
function End_Of_File (File : File_Type) return Boolean is
begin
return DIO.End_Of_File (FP (File));
end End_Of_File;
----------
-- Form --
----------
function Form (File : File_Type) return String is
begin
return FIO.Form (AP (File));
end Form;
-----------
-- Index --
-----------
function Index (File : File_Type) return Positive_Count is
begin
return Positive_Count (DIO.Index (FP (File)));
end Index;
-------------
-- Is_Open --
-------------
function Is_Open (File : File_Type) return Boolean is
begin
return FIO.Is_Open (AP (File));
end Is_Open;
----------
-- Mode --
----------
function Mode (File : File_Type) return File_Mode is
begin
return To_DIO (FIO.Mode (AP (File)));
end Mode;
----------
-- Name --
----------
function Name (File : File_Type) return String is
begin
return FIO.Name (AP (File));
end Name;
----------
-- Open --
----------
procedure Open
(File : in out File_Type;
Mode : File_Mode;
Name : String;
Form : String := "")
is
begin
DIO.Open (FP (File), To_FCB (Mode), Name, Form);
File.Bytes := Bytes;
end Open;
----------
-- Read --
----------
procedure Read
(File : File_Type;
Item : out Element_Type;
From : Positive_Count)
is
begin
-- For a non-constrained variant record type, we read into an
-- intermediate buffer, since we may have the case of discriminated
-- records where a discriminant check is required, and we may need
-- to assign only part of the record buffer originally written.
-- Note: we have to turn warnings on/off because this use of
-- the Constrained attribute is an obsolescent feature.
pragma Warnings (Off);
if not Element_Type'Constrained then
pragma Warnings (On);
declare
Buf : Element_Type;
begin
DIO.Read (FP (File), Buf'Address, Bytes, DPCount (From));
Item := Buf;
end;
-- In the normal case, we can read straight into the buffer
else
DIO.Read (FP (File), Item'Address, Bytes, DPCount (From));
end if;
end Read;
procedure Read (File : File_Type; Item : out Element_Type) is
begin
-- Same processing for unconstrained case as above
-- Note: we have to turn warnings on/off because this use of
-- the Constrained attribute is an obsolescent feature.
pragma Warnings (Off);
if not Element_Type'Constrained then
pragma Warnings (On);
declare
Buf : Element_Type;
begin
DIO.Read (FP (File), Buf'Address, Bytes);
Item := Buf;
end;
else
DIO.Read (FP (File), Item'Address, Bytes);
end if;
end Read;
-----------
-- Reset --
-----------
procedure Reset (File : in out File_Type; Mode : File_Mode) is
begin
DIO.Reset (FP (File), To_FCB (Mode));
end Reset;
procedure Reset (File : in out File_Type) is
begin
DIO.Reset (FP (File));
end Reset;
---------------
-- Set_Index --
---------------
procedure Set_Index (File : File_Type; To : Positive_Count) is
begin
DIO.Set_Index (FP (File), DPCount (To));
end Set_Index;
----------
-- Size --
----------
function Size (File : File_Type) return Count is
begin
return Count (DIO.Size (FP (File)));
end Size;
-----------
-- Write --
-----------
procedure Write
(File : File_Type;
Item : Element_Type;
To : Positive_Count)
is
begin
DIO.Set_Index (FP (File), DPCount (To));
DIO.Write (FP (File), Item'Address, Item'Size / SU, Zeroes);
end Write;
procedure Write (File : File_Type; Item : Element_Type) is
begin
DIO.Write (FP (File), Item'Address, Item'Size / SU, Zeroes);
end Write;
end Ada.Direct_IO;
|
