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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . F O R E --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2009 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 is
+
+ ----------
+ -- Fore --
+ ----------
+
+ function Fore (Lo, Hi : Long_Long_Float) return Natural is
+ T : Long_Long_Float := Long_Long_Float'Max (abs Lo, abs Hi);
+ R : Natural;
+
+ begin
+ -- Initial value of 2 allows for sign and mandatory single digit
+
+ R := 2;
+
+ -- Loop to increase Fore as needed to include full range of values
+
+ while T >= 10.0 loop
+ T := T / 10.0;
+ R := R + 1;
+ end loop;
+
+ return R;
+ end Fore;
+end System.Fore;