gcc/ada/libgnat/a-swunau.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                          GNAT RUN-TIME COMPONENTS                        --
   4 --                                                                          --
   5 --        A D A . S T R I N G S . W I D E _ U N B O U N D E D . A U X       --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2017, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This child package of Ada.Strings.Wide_Unbounded provides some specialized
  33 --  access functions which are intended to allow more efficient use of the
  34 --  facilities of Ada.Strings.Wide_Unbounded, particularly by other layered
  35 --  utilities.
  36
  37 package Ada.Strings.Wide_Unbounded.Aux is
  38    pragma Preelaborate;
  39
  40    subtype Big_Wide_String is Wide_String (Positive'Range);
  41    type Big_Wide_String_Access is access all Big_Wide_String;
  42
  43    procedure Get_Wide_String
  44      (U : Unbounded_Wide_String;
  45       S : out Big_Wide_String_Access;
  46       L : out Natural);
  47    pragma Inline (Get_Wide_String);
  48    --  This procedure returns the internal string pointer used in the
  49    --  representation of an unbounded string as well as the actual current
  50    --  length (which may be less than S.all'Length because in general there
  51    --  can be extra space assigned). The characters of this string may be
  52    --  not be modified via the returned pointer,  and are valid only as
  53    --  long as the original unbounded string is not accessed or modified.
  54    --
  55    --  This procedure is much more efficient than the use of To_Wide_String
  56    --  since it avoids the need to copy the string. The lower bound of the
  57    --  referenced string returned by this call is always one, so the actual
  58    --  string data is always accessible as S (1 .. L).
  59
  60    procedure Set_Wide_String (UP : out Unbounded_Wide_String; S : Wide_String)
  61      renames Set_Unbounded_Wide_String;
  62    --  This function sets the string contents of the referenced unbounded
  63    --  string to the given string value. It is significantly more efficient
  64    --  than the use of To_Unbounded_Wide_String with an assignment, since it
  65    --  avoids the necessity of messing with finalization chains. The lower
  66    --  bound of the string S is not required to be one.
  67
  68    procedure Set_Wide_String
  69      (UP : in out Unbounded_Wide_String;
  70       S  : Wide_String_Access);
  71    pragma Inline (Set_Wide_String);
  72    --  This version of Set_Wide_String takes a string access value, rather
  73    --  than string. The lower bound of the string value is required to be one,
  74    --  and this requirement is not checked.
  75
  76 end Ada.Strings.Wide_Unbounded.Aux;