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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) 1992-1998, 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
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;
|
