342 lines
8.8 KiB
Ada
342 lines
8.8 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- O U T P U T --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with System.OS_Lib; use System.OS_Lib;
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package body Output is
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Current_FD : File_Descriptor := Standout;
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-- File descriptor for current output
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Special_Output_Proc : Output_Proc := null;
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-- Record argument to last call to Set_Special_Output. If this is
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-- non-null, then we are in special output mode.
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-----------------------
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-- Local_Subprograms --
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-----------------------
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procedure Flush_Buffer;
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-- Flush buffer if non-empty and reset column counter
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---------------------------
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-- Cancel_Special_Output --
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---------------------------
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procedure Cancel_Special_Output is
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begin
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Special_Output_Proc := null;
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end Cancel_Special_Output;
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------------
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-- Column --
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------------
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function Column return Pos is
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begin
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return Pos (Next_Col);
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end Column;
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------------------
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-- Flush_Buffer --
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------------------
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procedure Flush_Buffer is
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Len : constant Natural := Next_Col - 1;
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begin
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if Len /= 0 then
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-- If Special_Output_Proc has been set, then use it
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if Special_Output_Proc /= null then
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Special_Output_Proc.all (Buffer (1 .. Len));
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-- If output is not set, then output to either standard output
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-- or standard error.
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elsif Len /= Write (Current_FD, Buffer'Address, Len) then
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-- If there are errors with standard error, just quit
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if Current_FD = Standerr then
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OS_Exit (2);
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-- Otherwise, set the output to standard error before
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-- reporting a failure and quitting.
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else
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Current_FD := Standerr;
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Next_Col := 1;
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Write_Line ("fatal error: disk full");
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OS_Exit (2);
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end if;
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end if;
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-- Buffer is now empty
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Next_Col := 1;
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end if;
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end Flush_Buffer;
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---------------------------
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-- Restore_Output_Buffer --
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---------------------------
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procedure Restore_Output_Buffer (S : Saved_Output_Buffer) is
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begin
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Next_Col := S.Next_Col;
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Buffer (1 .. Next_Col - 1) := S.Buffer (1 .. Next_Col - 1);
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end Restore_Output_Buffer;
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------------------------
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-- Save_Output_Buffer --
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------------------------
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function Save_Output_Buffer return Saved_Output_Buffer is
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S : Saved_Output_Buffer;
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begin
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S.Buffer (1 .. Next_Col - 1) := Buffer (1 .. Next_Col - 1);
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S.Next_Col := Next_Col;
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Next_Col := 1;
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return S;
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end Save_Output_Buffer;
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------------------------
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-- Set_Special_Output --
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------------------------
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procedure Set_Special_Output (P : Output_Proc) is
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begin
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Special_Output_Proc := P;
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end Set_Special_Output;
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------------------------
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-- Set_Standard_Error --
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------------------------
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procedure Set_Standard_Error is
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begin
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if Special_Output_Proc = null then
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Flush_Buffer;
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Next_Col := 1;
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end if;
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Current_FD := Standerr;
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end Set_Standard_Error;
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-------------------------
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-- Set_Standard_Output --
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-------------------------
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procedure Set_Standard_Output is
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begin
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if Special_Output_Proc = null then
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Flush_Buffer;
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Next_Col := 1;
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end if;
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Current_FD := Standout;
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end Set_Standard_Output;
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-------
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-- w --
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-------
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procedure w (C : Character) is
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begin
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Write_Char (''');
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Write_Char (C);
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Write_Char (''');
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Write_Eol;
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end w;
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procedure w (S : String) is
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begin
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Write_Str (S);
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Write_Eol;
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end w;
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procedure w (V : Int) is
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begin
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Write_Int (V);
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Write_Eol;
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end w;
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procedure w (B : Boolean) is
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begin
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if B then
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w ("True");
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else
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w ("False");
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end if;
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end w;
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procedure w (L : String; C : Character) is
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begin
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Write_Str (L);
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Write_Char (' ');
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w (C);
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end w;
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procedure w (L : String; S : String) is
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begin
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Write_Str (L);
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Write_Char (' ');
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w (S);
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end w;
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procedure w (L : String; V : Int) is
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begin
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Write_Str (L);
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Write_Char (' ');
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w (V);
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end w;
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procedure w (L : String; B : Boolean) is
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begin
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Write_Str (L);
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Write_Char (' ');
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w (B);
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end w;
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----------------
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-- Write_Char --
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----------------
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procedure Write_Char (C : Character) is
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begin
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if Next_Col = Buffer'Length then
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Write_Eol;
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end if;
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if C = ASCII.LF then
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Write_Eol;
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else
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Buffer (Next_Col) := C;
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Next_Col := Next_Col + 1;
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end if;
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end Write_Char;
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---------------
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-- Write_Eol --
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---------------
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procedure Write_Eol is
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begin
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-- Remove any trailing space
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while Next_Col > 1 and then Buffer (Next_Col - 1) = ' ' loop
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Next_Col := Next_Col - 1;
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end loop;
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Buffer (Next_Col) := ASCII.LF;
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Next_Col := Next_Col + 1;
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Flush_Buffer;
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end Write_Eol;
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---------------------------
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-- Write_Eol_Keep_Blanks --
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---------------------------
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procedure Write_Eol_Keep_Blanks is
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begin
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Buffer (Next_Col) := ASCII.LF;
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Next_Col := Next_Col + 1;
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Flush_Buffer;
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end Write_Eol_Keep_Blanks;
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----------------------
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-- Write_Erase_Char --
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----------------------
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procedure Write_Erase_Char (C : Character) is
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begin
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if Next_Col /= 1 and then Buffer (Next_Col - 1) = C then
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Next_Col := Next_Col - 1;
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end if;
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end Write_Erase_Char;
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---------------
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-- Write_Int --
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---------------
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procedure Write_Int (Val : Int) is
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begin
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if Val < 0 then
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Write_Char ('-');
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Write_Int (-Val);
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else
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if Val > 9 then
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Write_Int (Val / 10);
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end if;
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Write_Char (Character'Val ((Val mod 10) + Character'Pos ('0')));
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end if;
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end Write_Int;
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----------------
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-- Write_Line --
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----------------
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procedure Write_Line (S : String) is
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begin
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Write_Str (S);
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Write_Eol;
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end Write_Line;
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------------------
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-- Write_Spaces --
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------------------
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procedure Write_Spaces (N : Nat) is
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begin
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for J in 1 .. N loop
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Write_Char (' ');
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end loop;
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end Write_Spaces;
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---------------
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-- Write_Str --
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---------------
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procedure Write_Str (S : String) is
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begin
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for J in S'Range loop
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Write_Char (S (J));
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end loop;
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end Write_Str;
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end Output;
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