--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/widechar.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,101 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                             W I D E C H A R                              --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  Subprograms for manipulation of wide character sequences. Note that in
+--  this package, wide character and wide wide character are not distinguished
+--  since this package is basically concerned with syntactic notions, and it
+--  deals with Char_Code values, rather than values of actual Ada types.
+
+with Types; use Types;
+
+package Widechar is
+
+   Wide_Char_Byte_Count : Nat := 0;
+   --  This value is incremented whenever Scan_Wide or Skip_Wide is called.
+   --  The amount added is the length of the wide character sequence minus
+   --  one. This means that the count that accumulates here represents the
+   --  difference between the length in characters and the length in bytes.
+   --  This is used for checking the line length in characters.
+
+   function Length_Wide return Nat;
+   --  Returns the maximum length in characters for the escape sequence that
+   --  is used to encode wide character literals outside the ASCII range. Used
+   --  only in the implementation of the attribute Width for Wide_Character
+   --  and Wide_Wide_Character.
+
+   procedure Scan_Wide
+     (S   : Source_Buffer_Ptr;
+      P   : in out Source_Ptr;
+      C   : out Char_Code;
+      Err : out Boolean);
+   --  On entry S (P) points to the first character in the source text for
+   --  a wide character (i.e. to an ESC character, a left bracket, or an
+   --  upper half character, depending on the representation method). A
+   --  single wide character is scanned. If no error is found, the value
+   --  stored in C is the code for this wide character, P is updated past
+   --  the sequence and Err is set to False. If an error is found, then
+   --  P points to the improper character, C is undefined, and Err is
+   --  set to True.
+
+   procedure Set_Wide
+     (C : Char_Code;
+      S : in out String;
+      P : in out Natural);
+   --  The escape sequence (including any leading ESC character) for the
+   --  given character code is stored starting at S (P + 1), and on return
+   --  P points to the last stored character (i.e. P is the count of stored
+   --  characters on entry and exit, and the escape sequence is appended to
+   --  the end of the stored string). The character code C represents a code
+   --  originally constructed by Scan_Wide, so it is known to be in a range
+   --  that is appropriate for the encoding method in use.
+
+   procedure Skip_Wide (S : String; P : in out Natural);
+   --  On entry, S (P) points to an ESC character for a wide character escape
+   --  sequence or to an upper half character if the encoding method uses the
+   --  upper bit, or to a left bracket if the brackets encoding method is in
+   --  use. On exit, P is bumped past the wide character sequence. No error
+   --  checking is done, since this is only used on escape sequences generated
+   --  by Set_Wide, which are known to be correct.
+
+   procedure Skip_Wide (S : Source_Buffer_Ptr; P : in out Source_Ptr);
+   --  Similar to the above procedure, but operates on a source buffer
+   --  instead of a string, with P being a Source_Ptr referencing the
+   --  contents of the source buffer.
+
+   function Is_Start_Of_Wide_Char
+     (S : Source_Buffer_Ptr;
+      P : Source_Ptr) return Boolean;
+   --  Determines if S (P) is the start of a wide character sequence
+
+private
+   pragma Inline (Is_Start_Of_Wide_Char);
+
+end Widechar;