mountpoint.cc

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/*
    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.

    $Id$
*/
#ifndef  COMPILER_MSVC
#include <cstdio>
#include <cstring>
#include <string>
#include <cstring>
#include <limits.h>

#include "pbd/mountpoint.h"

using std::string;

#ifdef WAF_BUILD
#include "libpbd-config.h"
#endif

#ifdef 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;
}

#elif defined(PLATFORM_WINDOWS)
#include <assert.h>
string
mountpoint (string path)
{
        /* this function is currently only called from 'old_peak_path()'
         * via find_broken_peakfile() - only relevant for loading pre
         * libsndfile Ardour 2.0 sessions.
         */
        assert(0);
        return ""; // TODO ... if needed
}

#else // !HAVE_GETMNTENT

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

string
mountpoint (string path)
{
        struct statfs *mntbufp = 0;
        int count;
        unsigned int maxmatch = 0;
        unsigned int matchlen;
        const char *cpath = path.c_str();
        char best[PATH_MAX+1];
        
        /* From the manpage, under "BUGS" : "The memory allocated by getmntinfo() cannot be free(3)'d by the 
           application."
           
           Thus: we do NOT try to free memory allocated by getmntinfo()
        */

        if ((count = getmntinfo(&mntbufp, MNT_NOWAIT)) == 0) {
                return "\0";
        }

        best[0] = '\0';

        for (int i = 0; i < count; ++i) {
                unsigned int n = 0;
                matchlen = 0;

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

                while (cpath[n] && mntbufp[i].f_mntonname[n]) {
                        if (cpath[n] != mntbufp[i].f_mntonname[n]) {
                                break;
                        }
                        matchlen++;
                        n++;
                }

                if (cpath[matchlen] == '\0') {
                        snprintf(best, sizeof(best), "%s", mntbufp[i].f_mntonname);
                        return best;

                } else {

                        if (matchlen > maxmatch) {
                                snprintf (best, sizeof(best), "%s", mntbufp[i].f_mntonname);
                                maxmatch = matchlen;
                        }
                }
        }
        
        return best;
}
#endif // HAVE_GETMNTENT

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

#endif // TEST_MOUNTPOINT

#else  // COMPILER_MSVC
        const char* pbd_mountpoint = "pbd/msvc/mountpoint.cc takes precedence over this file";
#endif // COMPILER_MSVC