------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- O U T P U T -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2003, 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. -- -- -- ------------------------------------------------------------------------------ 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 Write_Eol; end if; Buffer (Natural (Next_Column)) := C; Next_Column := Next_Column + 1; 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;