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#### BP compatibility: Strings

The following listing contains the interface of the Strings unit.

This is a compatibility unit to BP's `Strings` unit to handle C style `#0`-terminated strings.

The same functionality and much more is available in the Run Time System, Run Time System, under clearer names (starting with a `CString` prefix),

Moreover, the use of `#0`-terminated C-style strings (`PChar` or `CString`) is generally not recommended in GPC, since GPC provides ways to deal with Pascal-style strings of arbitrary and dynamic size in a comfortable way, as well as automatic conversion to C-style strings in order to call external C functions.

Therefore, using this unit is not recommended in newly written programs.

    { BP compatible Strings unit

      Copyright (C) 1999-2003 Free Software Foundation, Inc.

      Author: Frank Heckenbach <frank@pascal.gnu.de>

      This file is part of GNU Pascal.

      GNU Pascal is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published
      by the Free Software Foundation; either version 2, or (at your
      option) any later version.

      GNU Pascal is distributed in the hope that it will be useful, but
      WITHOUT 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
      along with GNU Pascal; see the 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 you link this file with files compiled
      with a GNU compiler to produce an executable, this does not 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
      General Public License. }

    {$gnu-pascal,I-}
    {$if __GPC_RELEASE__ < 20030303}
    {$error This unit requires GPC release 20030303 or newer.}
    {$endif}

    module Strings;

    export Strings = all (CStringLength => StrLen, CStringEnd => StrEnd,
                          CStringMove => StrMove, CStringCopy =>
      StrCopy,
                          CStringCopyEnd => StrECopy, CStringLCopy =>
      StrLCopy,
                          CStringCopyString => StrPCopy, CStringCat =>
      StrCat,
                          CStringLCat => StrLCat, CStringComp =>
      StrComp,
                          CStringCaseComp => StrIComp, CStringLComp =>
      StrLComp,
                          CStringLCaseComp => StrLIComp, CStringChPos =>
      StrScan,
                          CStringLastChPos => StrRScan, CStringPos =>
      StrPos,
                          CStringLastPos => StrRPos, CStringUpCase =>
      StrUpper,
                          CStringLoCase => StrLower, CStringIsEmpty =>
      StrEmpty,
                          CStringNew => StrNew);

    import GPC;

    function StrPas (aString: CString): TString; attribute (name
      = '_p_StrPas');
    procedure StrDispose (s: CString); external name '_p_Dispose';