1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . W I D T H _ I                        --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2020, 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-- 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.               --
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
32function System.Width_I (Lo, Hi : Int) return Natural is
33   W : Natural;
34   T : Int;
35
36begin
37   if Lo > Hi then
38      return 0;
39
40   else
41      --  Minimum value is 2, one for sign, one for digit
42
43      W := 2;
44
45      --  Get max of absolute values, but avoid bomb if we have the maximum
46      --  negative number (note that First + 1 has same digits as First)
47
48      T := Int'Max (
49             abs (Int'Max (Lo, Int'First + 1)),
50             abs (Int'Max (Hi, Int'First + 1)));
51
52      --  Increase value if more digits required
53
54      while T >= 10 loop
55         T := T / 10;
56         W := W + 1;
57      end loop;
58
59      return W;
60   end if;
61
62end System.Width_I;
63