| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, 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; |
