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------------------------------------------------------------------------------ -- -- -- 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 Alpha/VMS version with Ada.Unchecked_Conversion; package body Interfaces.C_Streams is use type System.CRTL.size_t; -- As the functions fread, fwrite and setvbuf are too big to be inlined, -- they are just wrappers to the following implementation functions. function fread_impl (buffer : voids; size : size_t; count : size_t; stream : FILEs) return size_t; function fread_impl (buffer : voids; index : size_t; size : size_t; count : size_t; stream : FILEs) return size_t; function fwrite_impl (buffer : voids; size : size_t; count : size_t; stream : FILEs) return size_t; function setvbuf_impl (stream : FILEs; buffer : chars; mode : int; size : size_t) return int; ------------ -- fread -- ------------ function fread_impl (buffer : voids; size : size_t; count : size_t; stream : FILEs) return size_t is Get_Count : size_t := 0; type Buffer_Type is array (size_t range 1 .. count, size_t range 1 .. size) of Character; type Buffer_Access is access Buffer_Type; function To_BA is new Ada.Unchecked_Conversion (voids, Buffer_Access); BA : constant Buffer_Access := To_BA (buffer); Ch : int; begin -- This Fread goes with the Fwrite below. The C library fread sometimes -- can't read fputc generated files. for C in 1 .. count loop for S in 1 .. size loop Ch := fgetc (stream); if Ch = EOF then return Get_Count; end if; BA.all (C, S) := Character'Val (Ch); end loop; Get_Count := Get_Count + 1; end loop; return Get_Count; end fread_impl; function fread_impl (buffer : voids; index : size_t; size : size_t; count : size_t; stream : FILEs) return size_t is Get_Count : size_t := 0; type Buffer_Type is array (size_t range 1 .. count, size_t range 1 .. size) of Character; type Buffer_Access is access Buffer_Type; function To_BA is new Ada.Unchecked_Conversion (voids, Buffer_Access); BA : constant Buffer_Access := To_BA (buffer); Ch : int; begin -- This Fread goes with the Fwrite below. The C library fread sometimes -- can't read fputc generated files. for C in 1 + index .. count + index loop for S in 1 .. size loop Ch := fgetc (stream); if Ch = EOF then return Get_Count; end if; BA.all (C, S) := Character'Val (Ch); end loop; Get_Count := Get_Count + 1; end loop; return Get_Count; end fread_impl; function fread (buffer : voids; size : size_t; count : size_t; stream : FILEs) return size_t is begin return fread_impl (buffer, size, count, stream); end fread; function fread (buffer : voids; index : size_t; size : size_t; count : size_t; stream : FILEs) return size_t is begin return fread_impl (buffer, index, size, count, stream); end fread; ------------ -- fwrite -- ------------ function fwrite_impl (buffer : voids; size : size_t; count : size_t; stream : FILEs) return size_t is Put_Count : size_t := 0; type Buffer_Type is array (size_t range 1 .. count, size_t range 1 .. size) of Character; type Buffer_Access is access Buffer_Type; function To_BA is new Ada.Unchecked_Conversion (voids, Buffer_Access); BA : constant Buffer_Access := To_BA (buffer); begin -- Fwrite on VMS has the undesirable effect of always generating at -- least one record of output per call, regardless of buffering. To -- get around this, we do multiple fputc calls instead. for C in 1 .. count loop for S in 1 .. size loop if fputc (Character'Pos (BA.all (C, S)), stream) = EOF then return Put_Count; end if; end loop; Put_Count := Put_Count + 1; end loop; return Put_Count; end fwrite_impl; function fwrite (buffer : voids; size : size_t; count : size_t; stream : FILEs) return size_t is begin return fwrite_impl (buffer, size, count, stream); end fwrite; ------------- -- setvbuf -- ------------- function setvbuf_impl (stream : FILEs; buffer : chars; mode : int; size : size_t) return int is use type System.Address; begin -- In order for the above fwrite hack to work, we must always buffer -- stdout and stderr. Is_regular_file on VMS cannot detect when -- these are redirected to a file, so checking for that condition -- doesn't help. if mode = IONBF and then (stream = stdout or else stream = stderr) then return System.CRTL.setvbuf (stream, buffer, IOLBF, System.CRTL.size_t (size)); else return System.CRTL.setvbuf (stream, buffer, mode, System.CRTL.size_t (size)); end if; end setvbuf_impl; function setvbuf (stream : FILEs; buffer : chars; mode : int; size : size_t) return int is begin return setvbuf_impl (stream, buffer, mode, size); end setvbuf; end Interfaces.C_Streams;
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