/usr/share/ada/adainclude/gpr/gpr-stamps.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) 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/>. --
-- --
------------------------------------------------------------------------------
separate (GPR)
package body Stamps is
-----------------------
-- Local Subprograms --
-----------------------
function V (T : Time_Stamp_Type; X : Time_Stamp_Index) return Nat;
-- Extract two decimal digit value from time stamp
---------
-- "<" --
---------
function "<" (Left, Right : Time_Stamp_Type) return Boolean is
begin
return not (Left = Right) and then String (Left) < String (Right);
end "<";
----------
-- "<=" --
----------
function "<=" (Left, Right : Time_Stamp_Type) return Boolean is
begin
return not (Left > Right);
end "<=";
---------
-- "=" --
---------
function "=" (Left, Right : Time_Stamp_Type) return Boolean is
Sleft : Nat;
Sright : Nat;
begin
if String (Left) = String (Right) then
return True;
elsif Left (1) = ' ' or else Right (1) = ' ' then
return False;
end if;
-- In the following code we check for a difference of 2 seconds or less
-- Recall that the time stamp format is:
-- Y Y Y Y M M D D H H M M S S
-- 01 02 03 04 05 06 07 08 09 10 11 12 13 14
-- Note that we do not bother to worry about shifts in the day.
-- It seems unlikely that such shifts could ever occur in practice
-- and even if they do we err on the safe side, i.e., we say that the
-- time stamps are different.
Sright := V (Right, 13) + 60 * (V (Right, 11) + 60 * V (Right, 09));
Sleft := V (Left, 13) + 60 * (V (Left, 11) + 60 * V (Left, 09));
-- So the check is: dates must be the same, times differ 2 sec at most
return abs (Sleft - Sright) <= 2
and then String (Left (1 .. 8)) = String (Right (1 .. 8));
end "=";
---------
-- ">" --
---------
function ">" (Left, Right : Time_Stamp_Type) return Boolean is
begin
return not (Left = Right) and then String (Left) > String (Right);
end ">";
----------
-- ">=" --
----------
function ">=" (Left, Right : Time_Stamp_Type) return Boolean is
begin
return not (Left < Right);
end ">=";
-------
-- V --
-------
function V (T : Time_Stamp_Type; X : Time_Stamp_Index) return Nat is
begin
return 10 * (Character'Pos (T (X)) - Character'Pos ('0')) +
Character'Pos (T (X + 1)) - Character'Pos ('0');
end V;
end Stamps;
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