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mountpoint.cc

/*
    Copyright (C) 2002 Paul Davis 

    This program 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.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: mountpoint.cc,v 1.7 2005/03/12 00:39:03 pauld Exp $
*/

#include <cstdio>
#include <string>
#include <limits.h>

#include <pbd/mountpoint.h>

using std::string;

#if HAVE_GETMNTENT
#include <mntent.h>

struct mntent_sorter {
    bool operator() (const mntent *a, const mntent *b) {
          return strcmp (a->mnt_dir, b->mnt_dir);
    }
};

string
mountpoint (string path)
{
      FILE *mntf;
      mntent *mnt;
      unsigned int maxmatch = 0;
      unsigned int matchlen;
      const char *cpath = path.c_str();
      char best[PATH_MAX+1];
      
      if ((mntf = setmntent ("/etc/mtab", "r")) == 0) {
            return "";
      }

      best[0] = '\0';

      while ((mnt = getmntent (mntf))) {
            unsigned int n;

            n = 0;
            matchlen = 0;

            /* note: strcmp's semantics are not 
               strict enough to use for this.
            */

            while (cpath[n] && mnt->mnt_dir[n]) {
                  if (cpath[n] != mnt->mnt_dir[n]) {
                        break;
                  }
                  matchlen++;
                  n++;
            }

            if (cpath[matchlen] == '\0') {

                  endmntent (mntf);
                  return mnt->mnt_dir;

            } else {

                  if (matchlen > maxmatch) {
                        snprintf (best, sizeof(best), "%s", mnt->mnt_dir);
                        maxmatch = matchlen;
                  }
            }
      }

      endmntent (mntf);

      return best;
}

#else // no getmntent()

#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>

string
mountpoint (string path)
{
//XXX IMPLEMENT ME using getmntinfo() or getfsstat().
      return "/";
}
#endif

#ifdef TEST_MOUNTPOINT
            
main (int argc, char *argv[])
{
      printf ("mp of %s = %s\n", argv[1], mountpoint (argv[1]).c_str());
      exit (0);
}

#endif

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