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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . S T R I N G _ O P S _ C O N C A T _ 4 --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2009, 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- NOTE: This package is obsolescent. It is no longer used by the compiler
+-- which now generates concatenation inline. It is retained only because
+-- it may be used during bootstrapping using old versions of the compiler.
+
+pragma Compiler_Unit;
+
+package body System.String_Ops_Concat_4 is
+
+ ------------------
+ -- Str_Concat_4 --
+ ------------------
+
+ function Str_Concat_4 (S1, S2, S3, S4 : String) return String is
+ begin
+ if S1'Length = 0 then
+ return S2 & S3 & S4;
+
+ else
+ declare
+ L12 : constant Natural := S1'Length + S2'Length;
+ L13 : constant Natural := L12 + S3'Length;
+ L14 : constant Natural := L13 + S4'Length;
+ R : String (S1'First .. S1'First + L14 - 1);
+
+ begin
+ R (S1'First .. S1'Last) := S1;
+ R (S1'Last + 1 .. S1'First + L12 - 1) := S2;
+ R (S1'First + L12 .. S1'First + L13 - 1) := S3;
+ R (S1'First + L13 .. R'Last) := S4;
+ return R;
+ end;
+ end if;
+ end Str_Concat_4;
+
+end System.String_Ops_Concat_4;