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
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- I N T E R F A C E S . C _ S T R E A M S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1996-2003 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is the default version which just calls the C versions directly
-- Note: the reason that we provide for specialization here is that on
-- some systems, notably VMS, we may need to worry about buffering.
with Unchecked_Conversion;
package body Interfaces.C_Streams is
use type System.CRTL.size_t;
----------------------------
-- Interfaced C functions --
----------------------------
function C_fread
(buffer : voids;
size : size_t;
count : size_t;
stream : FILEs) return size_t;
pragma Import (C, C_fread, "fread");
function C_fwrite
(buffer : voids;
size : size_t;
count : size_t;
stream : FILEs) return size_t;
pragma Import (C, C_fwrite, "fwrite");
function C_setvbuf
(stream : FILEs;
buffer : chars;
mode : int;
size : size_t) return int;
pragma Import (C, C_setvbuf, "setvbuf");
------------
-- fread --
------------
function fread
(buffer : voids;
size : size_t;
count : size_t;
stream : FILEs) return size_t
is
begin
return C_fread (buffer, size, count, stream);
end fread;
------------
-- fread --
------------
-- The following declarations should really be nested within fread, but
-- limitations in front end inlining make this undesirable right now ???
type Byte_Buffer is array (0 .. size_t'Last / 2 - 1) of Unsigned_8;
-- This should really be 0 .. size_t'last, but there is a problem
-- in gigi in handling such types (introduced in GCC 3 Sep 2001)
-- since the size in bytes of this array overflows ???
type Acc_Bytes is access all Byte_Buffer;
function To_Acc_Bytes is new Unchecked_Conversion (voids, Acc_Bytes);
function fread
(buffer : voids;
index : size_t;
size : size_t;
count : size_t;
stream : FILEs) return size_t
is
begin
return C_fread
(To_Acc_Bytes (buffer) (index * size)'Address, size, count, stream);
end fread;
------------
-- fwrite --
------------
function fwrite
(buffer : voids;
size : size_t;
count : size_t;
stream : FILEs) return size_t
is
begin
return C_fwrite (buffer, size, count, stream);
end fwrite;
-------------
-- setvbuf --
-------------
function setvbuf
(stream : FILEs;
buffer : chars;
mode : int;
size : size_t) return int
is
begin
return C_setvbuf (stream, buffer, mode, size);
end setvbuf;
end Interfaces.C_Streams;
|
