1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . V A L _ C H A R --
9 -- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
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/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 with System.Val_Util; use System.Val_Util;
34 package body System.Val_Char is
40 function Value_Character (Str : String) return Character is
43 S : String (Str'Range) := Str;
46 Normalize_String (S, F, L);
48 -- Accept any single character enclosed in quotes
50 if L - F = 2 and then S (F) = ''' and then S (L) = ''' then
51 return Character'Val (Character'Pos (S (F + 1)));
53 -- Check control character cases
56 for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop
57 if S (F .. L) = Character'Image (C) then
62 for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop
63 if S (F .. L) = Character'Image (C) then
68 if S (F .. L) = "SOFT_HYPHEN" then
69 return Character'Val (16#AD#);