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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. --
-- --
------------------------------------------------------------------------------
-- NOTE: This package is obsolescent. It is no longer used by the compiler
-- which now generates concatenation inline. It is retained only because
-- it may be used during bootstrapping using old versions of the compiler.
pragma Compiler_Unit;
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;
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