--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/a-tideau.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,261 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--              A D A . T E X T _ I O . D E C I M A L _ A U X               --
+--                                                                          --
+--                                 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 Ada.Text_IO.Generic_Aux; use Ada.Text_IO.Generic_Aux;
+with Ada.Text_IO.Float_Aux;   use Ada.Text_IO.Float_Aux;
+
+with System.Img_Dec; use System.Img_Dec;
+with System.Img_LLD; use System.Img_LLD;
+with System.Val_Dec; use System.Val_Dec;
+with System.Val_LLD; use System.Val_LLD;
+
+package body Ada.Text_IO.Decimal_Aux is
+
+   -------------
+   -- Get_Dec --
+   -------------
+
+   function Get_Dec
+     (File  : File_Type;
+      Width : Field;
+      Scale : Integer) return Integer
+   is
+      Buf  : String (1 .. Field'Last);
+      Ptr  : aliased Integer;
+      Stop : Integer := 0;
+      Item : Integer;
+
+   begin
+      if Width /= 0 then
+         Load_Width (File, Width, Buf, Stop);
+         String_Skip (Buf, Ptr);
+      else
+         Load_Real (File, Buf, Stop);
+         Ptr := 1;
+      end if;
+
+      Item := Scan_Decimal (Buf, Ptr'Access, Stop, Scale);
+      Check_End_Of_Field (Buf, Stop, Ptr, Width);
+      return Item;
+   end Get_Dec;
+
+   -------------
+   -- Get_LLD --
+   -------------
+
+   function Get_LLD
+     (File  : File_Type;
+      Width : Field;
+      Scale : Integer) return Long_Long_Integer
+   is
+      Buf  : String (1 .. Field'Last);
+      Ptr  : aliased Integer;
+      Stop : Integer := 0;
+      Item : Long_Long_Integer;
+
+   begin
+      if Width /= 0 then
+         Load_Width (File, Width, Buf, Stop);
+         String_Skip (Buf, Ptr);
+      else
+         Load_Real (File, Buf, Stop);
+         Ptr := 1;
+      end if;
+
+      Item := Scan_Long_Long_Decimal (Buf, Ptr'Access, Stop, Scale);
+      Check_End_Of_Field (Buf, Stop, Ptr, Width);
+      return Item;
+   end Get_LLD;
+
+   --------------
+   -- Gets_Dec --
+   --------------
+
+   function Gets_Dec
+     (From  : String;
+      Last  : not null access Positive;
+      Scale : Integer) return Integer
+   is
+      Pos  : aliased Integer;
+      Item : Integer;
+
+   begin
+      String_Skip (From, Pos);
+      Item := Scan_Decimal (From, Pos'Access, From'Last, Scale);
+      Last.all := Pos - 1;
+      return Item;
+
+   exception
+      when Constraint_Error =>
+         Last.all := Pos - 1;
+         raise Data_Error;
+   end Gets_Dec;
+
+   --------------
+   -- Gets_LLD --
+   --------------
+
+   function Gets_LLD
+     (From  : String;
+      Last  : not null access Positive;
+      Scale : Integer) return Long_Long_Integer
+   is
+      Pos  : aliased Integer;
+      Item : Long_Long_Integer;
+
+   begin
+      String_Skip (From, Pos);
+      Item := Scan_Long_Long_Decimal (From, Pos'Access, From'Last, Scale);
+      Last.all := Pos - 1;
+      return Item;
+
+   exception
+      when Constraint_Error =>
+         Last.all := Pos - 1;
+         raise Data_Error;
+   end Gets_LLD;
+
+   -------------
+   -- Put_Dec --
+   -------------
+
+   procedure Put_Dec
+     (File  : File_Type;
+      Item  : Integer;
+      Fore  : Field;
+      Aft   : Field;
+      Exp   : Field;
+      Scale : Integer)
+   is
+      Buf : String (1 .. Field'Last);
+      Ptr : Natural := 0;
+
+   begin
+      Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
+      Put_Item (File, Buf (1 .. Ptr));
+   end Put_Dec;
+
+   -------------
+   -- Put_LLD --
+   -------------
+
+   procedure Put_LLD
+     (File  : File_Type;
+      Item  : Long_Long_Integer;
+      Fore  : Field;
+      Aft   : Field;
+      Exp   : Field;
+      Scale : Integer)
+   is
+      Buf : String (1 .. Field'Last);
+      Ptr : Natural := 0;
+
+   begin
+      Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
+      Put_Item (File, Buf (1 .. Ptr));
+   end Put_LLD;
+
+   --------------
+   -- Puts_Dec --
+   --------------
+
+   procedure Puts_Dec
+     (To    : out String;
+      Item  : Integer;
+      Aft   : Field;
+      Exp   : Field;
+      Scale : Integer)
+   is
+      Buf  : String (1 .. Field'Last);
+      Fore : Integer;
+      Ptr  : Natural := 0;
+
+   begin
+      --  Compute Fore, allowing for Aft digits and the decimal dot
+
+      Fore := To'Length - Field'Max (1, Aft) - 1;
+
+      --  Allow for Exp and two more for E+ or E- if exponent present
+
+      if Exp /= 0 then
+         Fore := Fore - 2 - Exp;
+      end if;
+
+      --  Make sure we have enough room
+
+      if Fore < 1 then
+         raise Layout_Error;
+      end if;
+
+      --  Do the conversion and check length of result
+
+      Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
+
+      if Ptr > To'Length then
+         raise Layout_Error;
+      else
+         To := Buf (1 .. Ptr);
+      end if;
+   end Puts_Dec;
+
+   --------------
+   -- Puts_Dec --
+   --------------
+
+   procedure Puts_LLD
+     (To    : out String;
+      Item  : Long_Long_Integer;
+      Aft   : Field;
+      Exp   : Field;
+      Scale : Integer)
+   is
+      Buf  : String (1 .. Field'Last);
+      Fore : Integer;
+      Ptr  : Natural := 0;
+
+   begin
+      Fore :=
+        (if Exp = 0 then To'Length - 1 - Aft else To'Length - 2 - Aft - Exp);
+
+      if Fore < 1 then
+         raise Layout_Error;
+      end if;
+
+      Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
+
+      if Ptr > To'Length then
+         raise Layout_Error;
+      else
+         To := Buf (1 .. Ptr);
+      end if;
+   end Puts_LLD;
+
+end Ada.Text_IO.Decimal_Aux;