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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- --
+-- S Y S T E M . S T R I N G _ O P S --
+-- --
+-- 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. --
+-- --
+------------------------------------------------------------------------------
+
+pragma Warnings (Off);
+pragma Compiler_Unit;
+pragma Warnings (On);
+
+package body System.String_Ops is
+
+ ----------------
+ -- Str_Concat --
+ ----------------
+
+ function Str_Concat (X, Y : String) return String is
+ begin
+ if X'Length = 0 then
+ return Y;
+
+ else
+ declare
+ L : constant Natural := X'Length + Y'Length;
+ R : String (X'First .. X'First + L - 1);
+
+ begin
+ R (X'Range) := X;
+ R (X'First + X'Length .. R'Last) := Y;
+ return R;
+ end;
+ end if;
+ end Str_Concat;
+
+ -------------------
+ -- Str_Concat_CC --
+ -------------------
+
+ function Str_Concat_CC (X, Y : Character) return String is
+ R : String (1 .. 2);
+
+ begin
+ R (1) := X;
+ R (2) := Y;
+ return R;
+ end Str_Concat_CC;
+
+ -------------------
+ -- Str_Concat_CS --
+ -------------------
+
+ function Str_Concat_CS (X : Character; Y : String) return String is
+ R : String (1 .. Y'Length + 1);
+
+ begin
+ R (1) := X;
+ R (2 .. R'Last) := Y;
+ return R;
+ end Str_Concat_CS;
+
+ -------------------
+ -- Str_Concat_SC --
+ -------------------
+
+ function Str_Concat_SC (X : String; Y : Character) return String is
+ begin
+ if X'Length = 0 then
+ return (1 => Y);
+
+ else
+ declare
+ R : String (X'First .. X'Last + 1);
+
+ begin
+ R (X'Range) := X;
+ R (R'Last) := Y;
+ return R;
+ end;
+ end if;
+ end Str_Concat_SC;
+
+end System.String_Ops;