1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- I N T E R F A C E S . C _ S T R E A M S --
9 -- Copyright (C) 1996-2003 Free Software Foundation, Inc. --
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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the default version which just calls the C versions directly
35 -- Note: the reason that we provide for specialization here is that on
36 -- some systems, notably VMS, we may need to worry about buffering.
38 with Unchecked_Conversion;
40 package body Interfaces.C_Streams is
42 use type System.CRTL.size_t;
44 ----------------------------
45 -- Interfaced C functions --
46 ----------------------------
52 stream : FILEs) return size_t;
53 pragma Import (C, C_fread, "fread");
59 stream : FILEs) return size_t;
60 pragma Import (C, C_fwrite, "fwrite");
66 size : size_t) return int;
67 pragma Import (C, C_setvbuf, "setvbuf");
77 stream : FILEs) return size_t
80 return C_fread (buffer, size, count, stream);
87 -- The following declarations should really be nested within fread, but
88 -- limitations in front end inlining make this undesirable right now ???
90 type Byte_Buffer is array (0 .. size_t'Last / 2 - 1) of Unsigned_8;
91 -- This should really be 0 .. size_t'last, but there is a problem
92 -- in gigi in handling such types (introduced in GCC 3 Sep 2001)
93 -- since the size in bytes of this array overflows ???
95 type Acc_Bytes is access all Byte_Buffer;
97 function To_Acc_Bytes is new Unchecked_Conversion (voids, Acc_Bytes);
104 stream : FILEs) return size_t
108 (To_Acc_Bytes (buffer) (index * size)'Address, size, count, stream);
119 stream : FILEs) return size_t
122 return C_fwrite (buffer, size, count, stream);
133 size : size_t) return int
136 return C_setvbuf (stream, buffer, mode, size);
139 end Interfaces.C_Streams;