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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . S T R I N G _ O P S --
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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 is
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----------------
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-- Str_Concat --
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----------------
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function Str_Concat (X, Y : String) return String is
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begin
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if X'Length = 0 then
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return Y;
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else
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declare
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L : constant Natural := X'Length + Y'Length;
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R : String (X'First .. X'First + L - 1);
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begin
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R (X'Range) := X;
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R (X'First + X'Length .. R'Last) := Y;
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return R;
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end;
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end if;
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end Str_Concat;
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-------------------
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-- Str_Concat_CC --
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-------------------
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function Str_Concat_CC (X, Y : Character) return String is
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R : String (1 .. 2);
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begin
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R (1) := X;
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R (2) := Y;
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return R;
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end Str_Concat_CC;
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-------------------
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-- Str_Concat_CS --
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-------------------
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function Str_Concat_CS (X : Character; Y : String) return String is
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R : String (1 .. Y'Length + 1);
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begin
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R (1) := X;
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R (2 .. R'Last) := Y;
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return R;
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end Str_Concat_CS;
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-------------------
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-- Str_Concat_SC --
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-------------------
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function Str_Concat_SC (X : String; Y : Character) return String is
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begin
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if X'Length = 0 then
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return (1 => Y);
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else
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declare
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R : String (X'First .. X'Last + 1);
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begin
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R (X'Range) := X;
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R (R'Last) := Y;
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return R;
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end;
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end if;
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end Str_Concat_SC;
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end System.String_Ops;
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