--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-valcha.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,76 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                      S Y S T E M . V A L _ C H A R                       --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          Copyright (C) 1992-2017, 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 3,  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.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- 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;
+
+         if S (F .. L) = "SOFT_HYPHEN" then
+            return Character'Val (16#AD#);
+         end if;
+
+         Bad_Value (Str);
+      end if;
+   end Value_Character;
+
+end System.Val_Char;