+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- 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 --
--- --
--- $Revision: 1.2.10.1 $
--- --
--- Copyright (C) 1996-1999 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.
-
-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;
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