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1996-09-28
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3KB
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57 lines
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . V A L _ B O O L --
-- --
-- B o d y --
-- --
-- $Revision: 1.7 $ --
-- --
-- Copyright (c) 1992,1993,1994 NYU, All Rights Reserved --
-- --
-- The GNAT library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU Library General Public License as published by --
-- the Free Software Foundation; either version 2, or (at your option) any --
-- later version. The GNAT library is distributed in the hope that it will --
-- be useful, but WITHOUT ANY WARRANTY; without even the implied warranty --
-- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- Library General Public License for more details. You should have --
-- received a copy of the GNU Library General Public License along with --
-- the GNAT library; see the file COPYING.LIB. If not, write to the Free --
-- Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
with System.Val_Util; use System.Val_Util;
package body System.Val_Bool is
-------------------
-- Value_Boolean --
-------------------
function Value_Boolean (Str : String) return Boolean is
F : Natural;
L : Natural;
S : String (Str'Range) := Str;
begin
Normalize_String (S, F, L);
if S (F .. L) = "TRUE" then
return True;
end if;
if S (F .. L) = "FALSE" then
return False;
end if;
raise Constraint_Error;
-- Above should use elsif, but this doesn't work in GNAT version 1.81???
end Value_Boolean;
end System.Val_Bool;