/usr/share/ada/adainclude/gnatvsn/output.adb is in libgnatvsn8-dev 8-20180414-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- O U T P U T --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2018, 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 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
package body Output is
Buffer : String (1 .. Buffer_Max + 1) := (others => '*');
for Buffer'Alignment use 4;
-- Buffer used to build output line. We do line buffering because it is
-- needed for the support of the debug-generated-code option (-gnatD). Note
-- any attempt to write more output to a line than can fit in the buffer
-- will be silently ignored. The alignment clause improves the efficiency
-- of the save/restore procedures.
Next_Col : Positive range 1 .. Buffer'Length + 1 := 1;
-- Column about to be written
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.
Indentation_Amount : constant Positive := 3;
-- Number of spaces to output for each indentation level
Indentation_Limit : constant Positive := 40;
-- Indentation beyond this number of spaces wraps around
pragma Assert (Indentation_Limit < Buffer_Max / 2);
-- Make sure this is substantially shorter than the line length
Cur_Indentation : Natural := 0;
-- Number of spaces to indent each line
-----------------------
-- 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;
------------
-- Column --
------------
function Column return Pos is
begin
return Pos (Next_Col);
end Column;
----------------------
-- Delete_Last_Char --
----------------------
procedure Delete_Last_Char is
begin
if Next_Col /= 1 then
Next_Col := Next_Col - 1;
end if;
end Delete_Last_Char;
------------------
-- Flush_Buffer --
------------------
procedure Flush_Buffer is
Write_Error : exception;
-- Raised if Write fails
------------------
-- Write_Buffer --
------------------
procedure Write_Buffer (Buf : String);
-- Write out Buf, either using Special_Output_Proc, or the normal way
-- using Write. Raise Write_Error if Write fails (presumably due to disk
-- full). Write_Error is not used in the case of Special_Output_Proc.
procedure Write_Buffer (Buf : String) is
begin
-- If Special_Output_Proc has been set, then use it
if Special_Output_Proc /= null then
Special_Output_Proc.all (Buf);
-- If output is not set, then output to either standard output
-- or standard error.
elsif Write (Current_FD, Buf'Address, Buf'Length) /= Buf'Length then
raise Write_Error;
end if;
end Write_Buffer;
Len : constant Natural := Next_Col - 1;
-- Start of processing for Flush_Buffer
begin
if Len /= 0 then
begin
-- If there's no indentation, or if the line is too long with
-- indentation, or if it's a blank line, just write the buffer.
if Cur_Indentation = 0
or else Cur_Indentation + Len > Buffer_Max
or else Buffer (1 .. Len) = (1 => ASCII.LF)
then
Write_Buffer (Buffer (1 .. Len));
-- Otherwise, construct a new buffer with preceding spaces, and
-- write that.
else
declare
Indented_Buffer : constant String :=
(1 .. Cur_Indentation => ' ') &
Buffer (1 .. Len);
begin
Write_Buffer (Indented_Buffer);
end;
end if;
exception
when Write_Error =>
-- If there are errors with standard error just quit. Otherwise
-- set the output to standard error before reporting a failure
-- and quitting.
if Current_FD /= Standerr then
Current_FD := Standerr;
Next_Col := 1;
Write_Line ("fatal error: disk full");
end if;
OS_Exit (2);
end;
-- Buffer is now empty
Next_Col := 1;
end if;
end Flush_Buffer;
-------------------
-- Ignore_Output --
-------------------
procedure Ignore_Output (S : String) is
begin
null;
end Ignore_Output;
------------
-- Indent --
------------
procedure Indent is
begin
-- The "mod" in the following assignment is to cause a wrap around in
-- the case where there is too much indentation.
Cur_Indentation :=
(Cur_Indentation + Indentation_Amount) mod Indentation_Limit;
end Indent;
---------------
-- Last_Char --
---------------
function Last_Char return Character is
begin
if Next_Col /= 1 then
return Buffer (Next_Col - 1);
else
return ASCII.NUL;
end if;
end Last_Char;
-------------
-- Outdent --
-------------
procedure Outdent is
begin
-- The "mod" here undoes the wrap around from Indent above
Cur_Indentation :=
(Cur_Indentation - Indentation_Amount) mod Indentation_Limit;
end Outdent;
---------------------------
-- Restore_Output_Buffer --
---------------------------
procedure Restore_Output_Buffer (S : Saved_Output_Buffer) is
begin
Next_Col := S.Next_Col;
Cur_Indentation := S.Cur_Indentation;
Buffer (1 .. Next_Col - 1) := S.Buffer (1 .. Next_Col - 1);
end Restore_Output_Buffer;
------------------------
-- Save_Output_Buffer --
------------------------
function Save_Output_Buffer return Saved_Output_Buffer is
S : Saved_Output_Buffer;
begin
S.Buffer (1 .. Next_Col - 1) := Buffer (1 .. Next_Col - 1);
S.Next_Col := Next_Col;
S.Cur_Indentation := Cur_Indentation;
Next_Col := 1;
Cur_Indentation := 0;
return S;
end Save_Output_Buffer;
------------------------
-- Set_Special_Output --
------------------------
procedure Set_Special_Output (P : Output_Proc) is
begin
Special_Output_Proc := P;
end Set_Special_Output;
----------------
-- Set_Output --
----------------
procedure Set_Output (FD : File_Descriptor) is
begin
if Special_Output_Proc = null then
Flush_Buffer;
end if;
Current_FD := FD;
end Set_Output;
------------------------
-- Set_Standard_Error --
------------------------
procedure Set_Standard_Error is
begin
Set_Output (Standerr);
end Set_Standard_Error;
-------------------------
-- Set_Standard_Output --
-------------------------
procedure Set_Standard_Output is
begin
Set_Output (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
pragma Assert (Next_Col in Buffer'Range);
if Next_Col = Buffer'Length then
Write_Eol;
end if;
if C = ASCII.LF then
Write_Eol;
else
Buffer (Next_Col) := C;
Next_Col := Next_Col + 1;
end if;
end Write_Char;
---------------
-- Write_Eol --
---------------
procedure Write_Eol is
begin
-- Remove any trailing spaces
while Next_Col > 1 and then Buffer (Next_Col - 1) = ' ' loop
Next_Col := Next_Col - 1;
end loop;
Buffer (Next_Col) := ASCII.LF;
Next_Col := Next_Col + 1;
Flush_Buffer;
end Write_Eol;
---------------------------
-- Write_Eol_Keep_Blanks --
---------------------------
procedure Write_Eol_Keep_Blanks is
begin
Buffer (Next_Col) := ASCII.LF;
Next_Col := Next_Col + 1;
Flush_Buffer;
end Write_Eol_Keep_Blanks;
----------------------
-- Write_Erase_Char --
----------------------
procedure Write_Erase_Char (C : Character) is
begin
if Next_Col /= 1 and then Buffer (Next_Col - 1) = C then
Next_Col := Next_Col - 1;
end if;
end Write_Erase_Char;
---------------
-- Write_Int --
---------------
procedure Write_Int (Val : Int) is
-- Type Int has one extra negative number (i.e. two's complement), so we
-- work with negative numbers here. Otherwise, negating Int'First will
-- overflow.
subtype Nonpositive is Int range Int'First .. 0;
procedure Write_Abs (Val : Nonpositive);
-- Write out the absolute value of Val
procedure Write_Abs (Val : Nonpositive) is
begin
if Val < -9 then
Write_Abs (Val / 10); -- Recursively write higher digits
end if;
Write_Char (Character'Val (-(Val rem 10) + Character'Pos ('0')));
end Write_Abs;
begin
if Val < 0 then
Write_Char ('-');
Write_Abs (Val);
else
Write_Abs (-Val);
end if;
end Write_Int;
----------------
-- Write_Line --
----------------
procedure Write_Line (S : String) is
begin
Write_Str (S);
Write_Eol;
end Write_Line;
------------------
-- Write_Spaces --
------------------
procedure Write_Spaces (N : Nat) is
begin
for J in 1 .. N loop
Write_Char (' ');
end loop;
end Write_Spaces;
---------------
-- 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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