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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . V A L _ C H A R --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with System.Val_Util; use System.Val_Util;
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package body System.Val_Char is
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---------------------
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-- Value_Character --
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---------------------
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function Value_Character (Str : String) return Character is
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F : Natural;
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L : Natural;
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S : String (Str'Range) := Str;
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begin
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Normalize_String (S, F, L);
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-- Accept any single character enclosed in quotes
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if L - F = 2 and then S (F) = ''' and then S (L) = ''' then
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return Character'Val (Character'Pos (S (F + 1)));
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-- Check control character cases
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else
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for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop
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if S (F .. L) = Character'Image (C) then
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return C;
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end if;
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end loop;
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for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop
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if S (F .. L) = Character'Image (C) then
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return C;
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end if;
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end loop;
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raise Constraint_Error;
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end if;
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end Value_Character;
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end System.Val_Char;
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