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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 _ 4 --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2013, 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 ------------------------------------------------------------------------------
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.
36 pragma Compiler_Unit_Warning;
38 package body System.String_Ops_Concat_4 is
40 ------------------
41 -- Str_Concat_4 --
42 ------------------
44 function Str_Concat_4 (S1, S2, S3, S4 : String) return String is
45 begin
46 if S1'Length = 0 then
47 return S2 & S3 & S4;
49 else
50 declare
51 L12 : constant Natural := S1'Length + S2'Length;
52 L13 : constant Natural := L12 + S3'Length;
53 L14 : constant Natural := L13 + S4'Length;
54 R : String (S1'First .. S1'First + L14 - 1);
56 begin
57 R (S1'First .. S1'Last) := S1;
58 R (S1'Last + 1 .. S1'First + L12 - 1) := S2;
59 R (S1'First + L12 .. S1'First + L13 - 1) := S3;
60 R (S1'First + L13 .. R'Last) := S4;
61 return R;
62 end;
63 end if;
64 end Str_Concat_4;
66 end System.String_Ops_Concat_4;