------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . F O R E _ D --
-- --
-- B o d y --
-- --
-- Copyright (C) 2020-2023, 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 System.Fore_D is
------------------
-- Fore_Decimal --
------------------
function Fore_Decimal (Lo, Hi : Int; Scale : Integer) return Natural is
function Negative_Abs (Val : Int) return Int is
(if Val <= 0 then Val else -Val);
-- Return the opposite of the absolute value of Val
T : Int := Int'Min (Negative_Abs (Lo), Negative_Abs (Hi));
F : Natural;
begin
-- Initial value of 2 allows for sign and mandatory single digit
F := 2;
-- Loop to increase Fore as needed to include full range of values
while T <= -10 loop
T := T / 10;
F := F + 1;
end loop;
return Natural'Max (F - Scale, 2);
end Fore_Decimal;
end System.Fore_D;