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index.C
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1998-03-25
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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
}