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Diffstat (limited to 'gcc/ada/i-cstrea.adb')
| -rw-r--r-- | gcc/ada/i-cstrea.adb | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/gcc/ada/i-cstrea.adb b/gcc/ada/i-cstrea.adb new file mode 100644 index 00000000000..00057dc33f1 --- /dev/null +++ b/gcc/ada/i-cstrea.adb @@ -0,0 +1,147 @@ +------------------------------------------------------------------------------ +-- -- +-- 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 -- +-- -- +-- $Revision: 1.7 $ +-- -- +-- Copyright (C) 1996-2001 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. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +-- 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 + + ------------ + -- fread -- + ------------ + + function fread + (buffer : voids; + size : size_t; + count : size_t; + stream : FILEs) + return size_t + is + function C_fread + (buffer : voids; + size : size_t; + count : size_t; + stream : FILEs) + return size_t; + pragma Import (C, C_fread, "fread"); + + begin + return C_fread (buffer, size, count, stream); + end fread; + + ------------ + -- fread -- + ------------ + + function fread + (buffer : voids; + index : size_t; + size : size_t; + count : size_t; + stream : FILEs) + return size_t + is + function C_fread + (buffer : voids; + size : size_t; + count : size_t; + stream : FILEs) + return size_t; + pragma Import (C, C_fread, "fread"); + + 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); + + 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 + function C_fwrite + (buffer : voids; + size : size_t; + count : size_t; + stream : FILEs) + return size_t; + pragma Import (C, C_fwrite, "fwrite"); + + 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 + function C_setvbuf + (stream : FILEs; + buffer : chars; + mode : int; + size : size_t) + return int; + pragma Import (C, C_setvbuf, "setvbuf"); + + begin + return C_setvbuf (stream, buffer, mode, size); + end setvbuf; + +end Interfaces.C_Streams; |