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--                                                                          --

--                          GNAT RUN-TIME COMPONENTS                        --

--                                                                          --

--            A D A . S T R I N G S . U N B O U N D E D . A U X             --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2011, 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.      --

--                                                                          --

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--  This child package of Ada.Strings.Unbounded provides some specialized

--  access functions which are intended to allow more efficient use of the

--  facilities of Ada.Strings.Unbounded, particularly by other layered

--  utilities (such as GNAT.SPITBOL.Patterns).

package Ada.Strings.Unbounded.Aux is

   pragma Preelaborate;

   subtype Big_String is String (1 .. Positive'Last);

   pragma Suppress_Initialization (Big_String);

   --  Type used to obtain string access to given address. Initialization is

   --  suppressed, since we never want to have variables of this type, and

   --  we never want to attempt initialiazation of virtual variables of this

   --  type (e.g. when pragma Normalize_Scalars is used).

   type Big_String_Access is access all Big_String;

   for Big_String_Access'Storage_Size use 0;

   --  We use this access type to pass a pointer to an area of storage to be

   --  accessed as a string. Of course when this pointer is used, it is the

   --  responsibility of the accessor to ensure proper bounds. The storage

   --  size clause ensures we do not allocate variables of this type.

   procedure Get_String

     (U : Unbounded_String;

      S : out Big_String_Access;

      L : out Natural);

   pragma Inline (Get_String);

   --  This procedure returns the internal string pointer used in the

   --  representation of an unbounded string as well as the actual current

   --  length (which may be less than S.all'Length because in general there

   --  can be extra space assigned). The characters of this string may be

   --  not be modified via the returned pointer,  and are valid only as

   --  long as the original unbounded string is not accessed or modified.

   --

   --  This procedure is much more efficient than the use of To_String

   --  since it avoids the need to copy the string. The lower bound of the

   --  referenced string returned by this call is always one, so the actual

   --  string data is always accessible as S (1 .. L).

   procedure Set_String (UP : in out Unbounded_String; S : String_Access);

   pragma Inline (Set_String);

   --  This version of Set_Unbounded_String takes a string access value, rather

   --  than a string. The lower bound of the string value is required to be

   --  one, and this requirement is not checked.

end Ada.Strings.Unbounded.Aux;