File : s-fore.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M . F O R E --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
17 -- --
18 -- --
19 -- --
20 -- --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 package body System.Fore is
33
34 ----------
35 -- Fore --
36 ----------
37
38 function Fore (Lo, Hi : Long_Long_Float) return Natural is
39 T : Long_Long_Float := Long_Long_Float'Max (abs Lo, abs Hi);
40 R : Natural;
41
42 begin
43 -- Initial value of 2 allows for sign and mandatory single digit
44
45 R := 2;
46
47 -- Loop to increase Fore as needed to include full range of values
48
49 while T >= 10.0 loop
50 T := T / 10.0;
51 R := R + 1;
52 end loop;
53
54 return R;
55 end Fore;
56 end System.Fore;