2005-03-08 Robert Dewar <dewar@adacore.com>

	PR ada/13470

	* a-stunau.ads, a-stunau.adb:
	Change interface to allow efficient (and correct) implementation
	The previous changes to allow extra space in unbounded strings had
	left this interface a bit broken.

	* a-suteio.adb: Avoid unnecessary use of Get/Set_String

	* g-spipat.ads, g-spipat.adb: New interface for Get_String
	Minor reformatting (function specs)

	* g-spitbo.adb: New interface for Get_String

	* g-spitbo.ads: Minor reformatting

	* a-swunau.ads, a-swunau.adb: New interface for Get_Wide_String

	* a-szunau.ads, a-szunau.adb: New interface for Get_Wide_Wide_String


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@96488 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 12 insertions, 38 deletions

diff --git a/gcc/ada/a-swunau.adb b/gcc/ada/a-swunau.adb
index 2d9a2dd0b1c..2f4c127b71b 100644
--- a/gcc/ada/a-swunau.adb
+++ b/gcc/ada/a-swunau.adb
@@ -37,33 +37,14 @@ package body Ada.Strings.Wide_Unbounded.Aux is
    -- Get_Wide_String --
    ---------------------
 
-   function Get_Wide_String
-     (U : Unbounded_Wide_String) return Wide_String_Access
+   procedure Get_Wide_String
+     (U : Unbounded_Wide_String;
+      S : out Wide_String_Access;
+      L : out Natural)
    is
    begin
-      if U.Last = U.Reference'Length then
-         return U.Reference;
-
-      else
-         declare
-            type Unbounded_Wide_String_Access is
-              access all Unbounded_Wide_String;
-
-            U_Ptr : constant Unbounded_Wide_String_Access :=
-                      U'Unrestricted_Access;
-            --  Unbounded_Wide_String is a controlled type which is always
-            --  passed by copy it is always safe to take the pointer to such
-            --  object here. This pointer is used to set the U.Reference value
-            --  which would not be possible otherwise as U is read-only.
-
-            Old : Wide_String_Access := U.Reference;
-
-         begin
-            U_Ptr.Reference := new Wide_String'(U.Reference (1 .. U.Last));
-            Free (Old);
-            return U.Reference;
-         end;
-      end if;
+      S := U.Reference;
+      L := U.Last;
    end Get_Wide_String;
 
    ---------------------
@@ -75,20 +56,13 @@ package body Ada.Strings.Wide_Unbounded.Aux is
       S  : Wide_String)
    is
    begin
-      if UP.Last = S'Length then
-         UP.Reference.all := S;
-
-      else
-         declare
-            subtype String_1 is Wide_String (1 .. S'Length);
-            Tmp : Wide_String_Access;
-         begin
-            Tmp := new Wide_String'(String_1 (S));
-            Finalize (UP);
-            UP.Reference := Tmp;
-            UP.Last := UP.Reference'Length;
-         end;
+      if S'Length > UP.Last then
+         Finalize (UP);
+         UP.Reference := new Wide_String (1 .. S'Length);
       end if;
+
+      UP.Reference (1 .. S'Length) := S;
+      UP.Last := S'Length;
    end Set_Wide_String;
 
    procedure Set_Wide_String