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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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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 --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This child package of Ada.Strings.Wide_Unbounded provides some specialized
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33 -- access functions which are intended to allow more efficient use of the
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34 -- facilities of Ada.Strings.Wide_Unbounded, particularly by other layered
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35 -- utilities.
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36
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37 package Ada.Strings.Wide_Unbounded.Aux is
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38 pragma Preelaborate;
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39
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40 subtype Big_Wide_String is Wide_String (Positive'Range);
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41 type Big_Wide_String_Access is access all Big_Wide_String;
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42
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43 procedure Get_Wide_String
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44 (U : Unbounded_Wide_String;
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45 S : out Big_Wide_String_Access;
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46 L : out Natural);
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47 pragma Inline (Get_Wide_String);
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48 -- This procedure returns the internal string pointer used in the
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49 -- representation of an unbounded string as well as the actual current
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50 -- length (which may be less than S.all'Length because in general there
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51 -- can be extra space assigned). The characters of this string may be
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52 -- not be modified via the returned pointer, and are valid only as
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53 -- long as the original unbounded string is not accessed or modified.
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54 --
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55 -- This procedure is much more efficient than the use of To_Wide_String
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56 -- since it avoids the need to copy the string. The lower bound of the
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57 -- referenced string returned by this call is always one, so the actual
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58 -- string data is always accessible as S (1 .. L).
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59
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60 procedure Set_Wide_String (UP : out Unbounded_Wide_String; S : Wide_String)
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61 renames Set_Unbounded_Wide_String;
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62 -- This function sets the string contents of the referenced unbounded
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63 -- string to the given string value. It is significantly more efficient
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64 -- than the use of To_Unbounded_Wide_String with an assignment, since it
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65 -- avoids the necessity of messing with finalization chains. The lower
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66 -- bound of the string S is not required to be one.
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67
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68 procedure Set_Wide_String
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69 (UP : in out Unbounded_Wide_String;
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70 S : Wide_String_Access);
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71 pragma Inline (Set_Wide_String);
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72 -- This version of Set_Wide_String takes a string access value, rather
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73 -- than string. The lower bound of the string value is required to be one,
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74 -- and this requirement is not checked.
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75
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76 end Ada.Strings.Wide_Unbounded.Aux;
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