1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--           S Y S T E M . S T R I N G _ O P S _ C O N C A T _ 3            --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2018, 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--  NOTE: This package is obsolescent. It is no longer used by the compiler
33--  which now generates concatenation inline. It is retained only because
34--  it may be used during bootstrapping using old versions of the compiler.
35
36pragma Compiler_Unit_Warning;
37
38package body System.String_Ops_Concat_3 is
39
40   ------------------
41   -- Str_Concat_3 --
42   ------------------
43
44   function Str_Concat_3 (S1, S2, S3 : String) return String is
45   begin
46      if S1'Length = 0 then
47         return S2 & S3;
48
49      else
50         declare
51            L12 : constant Natural := S1'Length + S2'Length;
52            L13 : constant Natural := L12 + S3'Length;
53            R : String (S1'First .. S1'First + L13 - 1);
54
55         begin
56            R (S1'First       .. S1'Last)            := S1;
57            R (S1'Last + 1    .. S1'First + L12 - 1) := S2;
58            R (S1'First + L12 .. R'Last)             := S3;
59            return R;
60         end;
61      end if;
62   end Str_Concat_3;
63
64end System.String_Ops_Concat_3;
65