134 lines
4.6 KiB
Ada
134 lines
4.6 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- I N T E R F A C E S . C _ S T R E A M S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1996-2014, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Ada.Unchecked_Conversion;
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package body Interfaces.C_Streams is
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use type System.CRTL.size_t;
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----------------------------
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-- Interfaced C functions --
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----------------------------
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function C_fread
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(buffer : voids;
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size : size_t;
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count : size_t;
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stream : FILEs) return size_t;
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pragma Import (C, C_fread, "fread");
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function C_fwrite
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(buffer : voids;
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size : size_t;
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count : size_t;
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stream : FILEs) return size_t;
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pragma Import (C, C_fwrite, "fwrite");
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function C_setvbuf
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(stream : FILEs;
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buffer : chars;
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mode : int;
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size : size_t) return int;
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pragma Import (C, C_setvbuf, "setvbuf");
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------------
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-- fread --
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------------
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function fread
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(buffer : voids;
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size : size_t;
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count : size_t;
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stream : FILEs) return size_t
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is
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begin
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return C_fread (buffer, size, count, stream);
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end fread;
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------------
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-- fread --
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------------
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-- The following declarations should really be nested within fread, but
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-- limitations in front end inlining make this undesirable right now ???
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type Byte_Buffer is array (0 .. size_t'Last / 2 - 1) of Unsigned_8;
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-- This should really be 0 .. size_t'last, but there is a problem
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-- in gigi in handling such types (introduced in GCC 3 Sep 2001)
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-- since the size in bytes of this array overflows ???
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type Acc_Bytes is access all Byte_Buffer;
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function To_Acc_Bytes is new Ada.Unchecked_Conversion (voids, Acc_Bytes);
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function fread
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(buffer : voids;
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index : size_t;
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size : size_t;
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count : size_t;
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stream : FILEs) return size_t
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is
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begin
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return C_fread
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(To_Acc_Bytes (buffer) (index * size)'Address, size, count, stream);
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end fread;
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------------
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-- fwrite --
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------------
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function fwrite
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(buffer : voids;
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size : size_t;
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count : size_t;
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stream : FILEs) return size_t
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is
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begin
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return C_fwrite (buffer, size, count, stream);
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end fwrite;
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-------------
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-- setvbuf --
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-------------
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function setvbuf
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(stream : FILEs;
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buffer : chars;
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mode : int;
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size : size_t) return int
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is
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begin
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return C_setvbuf (stream, buffer, mode, size);
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end setvbuf;
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end Interfaces.C_Streams;
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