File : s-valboo.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S Y S T E M . V A L _ B O O L --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2012, 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_Util; use System.Val_Util;
33
34 package body System.Val_Bool is
35
36 -------------------
37 -- Value_Boolean --
38 -------------------
39
40 function Value_Boolean (Str : String) return Boolean is
41 F : Natural;
42 L : Natural;
43 S : String (Str'Range) := Str;
44
45 begin
46 Normalize_String (S, F, L);
47
48 if S (F .. L) = "TRUE" then
49 return True;
50
51 elsif S (F .. L) = "FALSE" then
52 return False;
53
54 else
55 Bad_Value (Str);
56 end if;
57 end Value_Boolean;
58
59 end System.Val_Bool;