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- // $Id: index.C,v 1.2 1998/03/25 12:46:04 zeller Exp $ -*- C++ -*-
- // Fast index function
-
- // Copyright (C) 1997 Technische Universitaet Braunschweig, Germany.
- // Written by Andreas Zeller <zeller@ips.cs.tu-bs.de>.
- //
- // This file is part of DDD.
- //
- // DDD 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 of the License, or (at your option) any later version.
- //
- // DDD 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 DDD -- see the file COPYING.
- // If not, write to the Free Software Foundation, Inc.,
- // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- //
- // DDD is the data display debugger.
- // For details, see the DDD World-Wide-Web page,
- // `http://www.cs.tu-bs.de/softech/ddd/',
- // or send a mail to the DDD developers <ddd@ips.cs.tu-bs.de>.
-
- char index_rcsid[] =
- "$Id: index.C,v 1.2 1998/03/25 12:46:04 zeller Exp $";
-
- #ifdef __GNUG__
- #pragma implementation
- #endif
-
- #include "index.h"
- #include "misc.h"
- #include <string.h>
-
-
- // Return index of R in S, starting with POS; PREFIX is the constant
- // prefix of R.
- int index(const string& s, const regex& r, const string& prefix, int startpos)
- {
- int direction = +1;
-
- if (startpos < 0)
- {
- startpos += s.length();
- direction = -1;
- }
- if (startpos < 0 || startpos > int(s.length()))
- return -1;
-
- for (; startpos >= 0 && startpos < int(s.length()); startpos += direction)
- {
- char *t = (char *)s + startpos;
- if (strncmp(t, prefix, min(prefix.length(),
- s.length() - startpos)) == 0
- && r.match(s, s.length(), startpos) >= 0)
- return startpos;
- }
-
- return -1; // not found
- }
-
-