1  /*
       2   * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
       3   *
       4   * This file may be redistributed under the terms of the
       5   * GNU Lesser General Public License.
       6   */
       7  
       8  #include <stdio.h>
       9  #include <stdlib.h>
      10  #include <sys/types.h>
      11  #include <sys/stat.h>
      12  #include <fcntl.h>
      13  #include <errno.h>
      14  
      15  #include <blkid.h>
      16  
      17  #include "c.h"
      18  
      19  int main(int argc, char *argv[])
      20  {
      21  	int rc;
      22  	char *devname;
      23  	blkid_probe pr;
      24  	blkid_topology tp;
      25  
      26  	if (argc < 2) {
      27  		fprintf(stderr, "usage: %s <device>  "
      28  			"-- checks based on libblkid for mkfs-like programs.\n",
      29  			program_invocation_short_name);
      30  		return EXIT_FAILURE;
      31  	}
      32  
      33  	devname = argv[1];
      34  	pr = blkid_new_probe_from_filename(devname);
      35  	if (!pr)
      36  		err(EXIT_FAILURE, "%s: failed to create a new libblkid probe",
      37  				devname);
      38  
      39  	/*
      40  	 * check Filesystems / Partitions overwrite
      41  	 */
      42  
      43  	/* enable partitions probing (superblocks are enabled by default) */
      44  	blkid_probe_enable_partitions(pr, TRUE);
      45  
      46  	rc = blkid_do_fullprobe(pr);
      47  	if (rc == -1)
      48  		errx(EXIT_FAILURE, "%s: blkid_do_fullprobe() failed", devname);
      49  	else if (rc == 0) {
      50  		const char *type;
      51  
      52  		if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL))
      53  			errx(EXIT_FAILURE, "%s: appears to contain an existing "
      54  					"%s superblock", devname, type);
      55  
      56  		if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL))
      57  			errx(EXIT_FAILURE, "%s: appears to contain a partition "
      58  					"table (%s)", devname, type);
      59  	}
      60  
      61  	/*
      62  	 * get topology details
      63  	 */
      64  	tp = blkid_probe_get_topology(pr);
      65  	if (!tp)
      66  		errx(EXIT_FAILURE, "%s: failed to read topology", devname);
      67  
      68  
      69  	/* ... your mkfs.<type> code or so ...
      70  
      71  	off = blkid_topology_get_alignment_offset(tp);
      72  
      73  	 */
      74  
      75  	blkid_free_probe(pr);
      76  
      77  	return EXIT_SUCCESS;
      78  }