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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- O U T P U T --
-- --
-- B o d y --
-- --
-- $Revision$
-- --
-- Copyright (C) 1992-2001, 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. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
with GNAT.OS_Lib; use GNAT.OS_Lib;
package body Output is
Current_FD : File_Descriptor := Standout;
-- File descriptor for current output
Special_Output_Proc : Output_Proc := null;
-- Record argument to last call to Set_Special_Output. If this is
-- non-null, then we are in special output mode.
-------------------------
-- Line Buffer Control --
-------------------------
-- Note: the following buffer and column position are maintained by
-- the subprograms defined in this package, and are not normally
-- directly modified or accessed by a client. However, a client is
-- permitted to modify these values, using the knowledge that only
-- Write_Eol actually generates any output.
Buffer_Max : constant := 8192;
Buffer : String (1 .. Buffer_Max + 1);
-- Buffer used to build output line. We do line buffering because it
-- is needed for the support of the debug-generated-code option (-gnatD).
-- Historically it was first added because on VMS, line buffering is
-- needed with certain file formats. So in any case line buffering must
-- be retained for this purpose, even if other reasons disappear. Note
-- any attempt to write more output to a line than can fit in the buffer
-- will be silently ignored.
Next_Column : Pos range 1 .. Buffer'Length + 1 := 1;
-- Column about to be written.
-----------------------
-- Local_Subprograms --
-----------------------
procedure Flush_Buffer;
-- Flush buffer if non-empty and reset column counter
---------------------------
-- Cancel_Special_Output --
---------------------------
procedure Cancel_Special_Output is
begin
Special_Output_Proc := null;
end Cancel_Special_Output;
------------------
-- Flush_Buffer --
------------------
procedure Flush_Buffer is
Len : constant Natural := Natural (Next_Column - 1);
begin
if Len /= 0 then
-- If Special_Output_Proc has been set, then use it
if Special_Output_Proc /= null then
Special_Output_Proc.all (Buffer (1 .. Len));
-- If output is not set, then output to either standard output
-- or standard error.
elsif Len /= Write (Current_FD, Buffer'Address, Len) then
-- If there are errors with standard error, just quit
if Current_FD = Standerr then
OS_Exit (2);
-- Otherwise, set the output to standard error before
-- reporting a failure and quitting.
else
Current_FD := Standerr;
Next_Column := 1;
Write_Line ("fatal error: disk full");
OS_Exit (2);
end if;
end if;
-- Buffer is now empty
Next_Column := 1;
end if;
end Flush_Buffer;
------------
-- Column --
------------
function Column return Nat is
begin
return Next_Column;
end Column;
------------------------
-- Set_Special_Output --
------------------------
procedure Set_Special_Output (P : Output_Proc) is
begin
Special_Output_Proc := P;
end Set_Special_Output;
------------------------
-- Set_Standard_Error --
------------------------
procedure Set_Standard_Error is
begin
if Special_Output_Proc = null then
Flush_Buffer;
Next_Column := 1;
end if;
Current_FD := Standerr;
end Set_Standard_Error;
-------------------------
-- Set_Standard_Output --
-------------------------
procedure Set_Standard_Output is
begin
if Special_Output_Proc = null then
Flush_Buffer;
Next_Column := 1;
end if;
Current_FD := Standout;
end Set_Standard_Output;
-------
-- w --
-------
procedure w (C : Character) is
begin
Write_Char (''');
Write_Char (C);
Write_Char (''');
Write_Eol;
end w;
procedure w (S : String) is
begin
Write_Str (S);
Write_Eol;
end w;
procedure w (V : Int) is
begin
Write_Int (V);
Write_Eol;
end w;
procedure w (B : Boolean) is
begin
if B then
w ("True");
else
w ("False");
end if;
end w;
procedure w (L : String; C : Character) is
begin
Write_Str (L);
Write_Char (' ');
w (C);
end w;
procedure w (L : String; S : String) is
begin
Write_Str (L);
Write_Char (' ');
w (S);
end w;
procedure w (L : String; V : Int) is
begin
Write_Str (L);
Write_Char (' ');
w (V);
end w;
procedure w (L : String; B : Boolean) is
begin
Write_Str (L);
Write_Char (' ');
w (B);
end w;
----------------
-- Write_Char --
----------------
procedure Write_Char (C : Character) is
begin
if Next_Column < Buffer'Length then
Buffer (Natural (Next_Column)) := C;
Next_Column := Next_Column + 1;
end if;
end Write_Char;
---------------
-- Write_Eol --
---------------
procedure Write_Eol is
begin
Buffer (Natural (Next_Column)) := ASCII.LF;
Next_Column := Next_Column + 1;
Flush_Buffer;
end Write_Eol;
---------------
-- Write_Int --
---------------
procedure Write_Int (Val : Int) is
begin
if Val < 0 then
Write_Char ('-');
Write_Int (-Val);
else
if Val > 9 then
Write_Int (Val / 10);
end if;
Write_Char (Character'Val ((Val mod 10) + Character'Pos ('0')));
end if;
end Write_Int;
----------------
-- Write_Line --
----------------
procedure Write_Line (S : String) is
begin
Write_Str (S);
Write_Eol;
end Write_Line;
---------------
-- Write_Str --
---------------
procedure Write_Str (S : String) is
begin
for J in S'Range loop
Write_Char (S (J));
end loop;
end Write_Str;
end Output;
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