------------------------------------------------------------------------------ -- -- -- 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) 1996-2002 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 Alpha/VMS version. with Unchecked_Conversion; package body Interfaces.C_Streams is ------------ -- fread -- ------------ function fread (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 Unchecked_Conversion (voids, Buffer_Access); BA : 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 0; end if; BA.all (C, S) := Character'Val (Ch); end loop; Get_Count := Get_Count + 1; end loop; return Get_Count; end fread; ------------ -- fread -- ------------ function fread (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 Unchecked_Conversion (voids, Buffer_Access); BA : 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 0; end if; BA.all (C, S) := Character'Val (Ch); end loop; Get_Count := Get_Count + 1; end loop; return Get_Count; end fread; ------------ -- fwrite -- ------------ function fwrite (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 Unchecked_Conversion (voids, Buffer_Access); BA : 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 exit; end if; end loop; Put_Count := Put_Count + 1; end loop; return Put_Count; end fwrite; ------------- -- setvbuf -- ------------- function setvbuf (stream : FILEs; buffer : chars; mode : int; size : size_t) return int is function C_setvbuf (stream : FILEs; buffer : chars; mode : int; size : size_t) return int; pragma Import (C, C_setvbuf, "setvbuf"); 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 C_setvbuf (stream, buffer, IOLBF, size); else return C_setvbuf (stream, buffer, mode, size); end if; end setvbuf; end Interfaces.C_Streams;