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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. --
+-- --
+------------------------------------------------------------------------------
+
+-- 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;