gcc/ada/s-fore.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                          S Y S T E M . F O R E                           --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.3 $                              --
  10 --                                                                          --
  11 --        Copyright (C) 1992,1993,1994 Free Software Foundation, Inc.       --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 package body System.Fore is
  37
  38    ----------
  39    -- Fore --
  40    ----------
  41
  42    function Fore (Lo, Hi : Long_Long_Float) return Natural is
  43       T : Long_Long_Float := Long_Long_Float'Max (abs Lo, abs Hi);
  44       R : Natural;
  45
  46    begin
  47       --  Initial value of 2 allows for sign and mandatory single digit
  48
  49       R := 2;
  50
  51       --  Loop to increase Fore as needed to include full range of values
  52
  53       while T >= 10.0 loop
  54          T := T / 10.0;
  55          R := R + 1;
  56       end loop;
  57
  58       return R;
  59    end Fore;
  60 end System.Fore;