1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- S Y S T E M . F O R E _ D --
9 -- Copyright (C) 2020-2024, Free Software Foundation, Inc. --
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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
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/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 package body System
.Fore_D
is
38 function Fore_Decimal
(Lo
, Hi
: Int
; Scale
: Integer) return Natural is
40 function Negative_Abs
(Val
: Int
) return Int
is
41 (if Val
<= 0 then Val
else -Val
);
42 -- Return the opposite of the absolute value of Val
44 T
: Int
:= Int
'Min (Negative_Abs
(Lo
), Negative_Abs
(Hi
));
48 -- Initial value of 2 allows for sign and mandatory single digit
52 -- Loop to increase Fore as needed to include full range of values
59 return Natural'Max (F
- Scale
, 2);