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Diffstat (limited to 'gcc-4.4.0/gcc/ada/i-cstrea.adb')
| -rw-r--r-- | gcc-4.4.0/gcc/ada/i-cstrea.adb | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/gcc-4.4.0/gcc/ada/i-cstrea.adb b/gcc-4.4.0/gcc/ada/i-cstrea.adb new file mode 100644 index 000000000..e072b0d41 --- /dev/null +++ b/gcc-4.4.0/gcc/ada/i-cstrea.adb @@ -0,0 +1,137 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 1996-2009, 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 3, 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. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- 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 Ada.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 Ada.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; |