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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . S T R I N G _ O P S _ C O N C A T _ 4 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- NOTE: This package is obsolescent. It is no longer used by the compiler
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-- which now generates concatenation inline. It is retained only because
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-- it may be used during bootstrapping using old versions of the compiler.
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pragma Compiler_Unit;
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package body System.String_Ops_Concat_4 is
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------------------
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-- Str_Concat_4 --
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------------------
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function Str_Concat_4 (S1, S2, S3, S4 : String) return String is
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begin
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if S1'Length = 0 then
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return S2 & S3 & S4;
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else
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declare
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L12 : constant Natural := S1'Length + S2'Length;
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L13 : constant Natural := L12 + S3'Length;
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L14 : constant Natural := L13 + S4'Length;
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R : String (S1'First .. S1'First + L14 - 1);
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begin
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R (S1'First .. S1'Last) := S1;
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R (S1'Last + 1 .. S1'First + L12 - 1) := S2;
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R (S1'First + L12 .. S1'First + L13 - 1) := S3;
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R (S1'First + L13 .. R'Last) := S4;
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return R;
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end;
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end if;
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end Str_Concat_4;
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end System.String_Ops_Concat_4;
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