------------------------------------------------------------------------------ -- -- -- 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;