------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . V A L _ C H A R -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992,1993,1994 Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 2, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- covered by the GNU Public License. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with System.Val_Util; use System.Val_Util; package body System.Val_Char is --------------------- -- Value_Character -- --------------------- function Value_Character (Str : String) return Character is F : Natural; L : Natural; S : String (Str'Range) := Str; begin Normalize_String (S, F, L); -- Accept any single character enclosed in quotes if L - F = 2 and then S (F) = ''' and then S (L) = ''' then return Character'Val (Character'Pos (S (F + 1))); -- Check control character cases else for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop if S (F .. L) = Character'Image (C) then return C; end if; end loop; for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop if S (F .. L) = Character'Image (C) then return C; end if; end loop; raise Constraint_Error; end if; end Value_Character; end System.Val_Char;