1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . V A L _ C H A R --
11 -- Copyright (C) 1992,1993,1994 Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNAT was originally developed by the GNAT team at New York University. --
32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 with System.Val_Util; use System.Val_Util;
38 package body System.Val_Char is
44 function Value_Character (Str : String) return Character is
47 S : String (Str'Range) := Str;
50 Normalize_String (S, F, L);
52 -- Accept any single character enclosed in quotes
54 if L - F = 2 and then S (F) = ''' and then S (L) = ''' then
55 return Character'Val (Character'Pos (S (F + 1)));
57 -- Check control character cases
60 for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop
61 if S (F .. L) = Character'Image (C) then
66 for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop
67 if S (F .. L) = Character'Image (C) then
72 raise Constraint_Error;