1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . V A L _ D E C                        --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2013, 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
32with System.Val_Real; use System.Val_Real;
33
34package body System.Val_Dec is
35
36   ------------------
37   -- Scan_Decimal --
38   ------------------
39
40   --  For decimal types where Size < Integer'Size, it is fine to use
41   --  the floating-point circuit, since it certainly has sufficient
42   --  precision for any reasonable hardware, and we just don't support
43   --  things on junk hardware.
44
45   function Scan_Decimal
46     (Str   : String;
47      Ptr   : not null access Integer;
48      Max   : Integer;
49      Scale : Integer) return Integer
50   is
51      Val : Long_Long_Float;
52   begin
53      Val := Scan_Real (Str, Ptr, Max);
54      return Integer (Val * 10.0 ** Scale);
55   end Scan_Decimal;
56
57   -------------------
58   -- Value_Decimal --
59   -------------------
60
61   --  Again, we use the real circuit for this purpose
62
63   function Value_Decimal (Str : String; Scale : Integer) return Integer is
64   begin
65      return Integer (Value_Real (Str) * 10.0 ** Scale);
66   end Value_Decimal;
67
68end System.Val_Dec;
69