File : s-valdec.adb
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 -- --
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 with System.Val_Real; use System.Val_Real;
33
34 package 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
68 end System.Val_Dec;