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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;