/usr/share/ada/adainclude/gpr/gpr-output.adb is in libgpr1-dev 2017-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- --
-- GPR PROJECT MANAGER --
-- --
-- Copyright (C) 2001-2015, Free Software Foundation, Inc. --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- 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/>. --
-- --
------------------------------------------------------------------------------
package body GPR.Output is
Buffer_Max : constant := 32767;
Buffer : String (1 .. Buffer_Max + 1) := (others => '*');
for Buffer'Alignment use 4;
-- Buffer used to build output line.
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.
-----------------------
-- Local_Subprograms --
-----------------------
procedure Flush_Buffer;
-- Flush buffer if non-empty and reset column counter
procedure Set_Output (FD : File_Descriptor);
-- Sets subsequent output to appear on the given file descriptor when no
-- special output is in effect. When a special output is in effect, the
-- output will appear on the given file descriptor only after special
-- output has been cancelled.
---------------------------
-- 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;
------------------
-- 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 line is too long or if it's a blank line, just write the
-- buffer.
if 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
Write_Buffer (Buffer (1 .. Len));
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;
------------------------
-- 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;
----------------
-- 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_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_Str --
---------------
procedure Write_Str (S : String) is
begin
for J in S'Range loop
Write_Char (S (J));
end loop;
end Write_Str;
end GPR.Output;
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