libblkid/samples/partitions.c

   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 #include "c.h"
  17
  18 int main(int argc, char *argv[])
  19 {
  20         int i, nparts;
  21         char *devname;
  22         blkid_probe pr;
  23         blkid_partlist ls;
  24         blkid_parttable root_tab;
  25
  26         if (argc < 2) {
  27                 fprintf(stderr, "usage: %s <device|file>  "
  28                                 "-- prints partitions\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         /* Binary interface */
  39         ls = blkid_probe_get_partitions(pr);
  40         if (!ls)
  41                 errx(EXIT_FAILURE, "%s: failed to read partitions\n", devname);
  42
  43         /*
  44          * Print info about the primary (root) partition table
  45          */
  46         root_tab = blkid_partlist_get_table(ls);
  47         if (!root_tab)
  48                 errx(EXIT_FAILURE, "%s: does not contains any "
  49                                  "known partition table\n", devname);
  50
  51         printf("size: %jd, sector size: %u, PT: %s, offset: %jd, id=%s\n---\n",
  52                 (intmax_t)blkid_probe_get_size(pr),
  53                 blkid_probe_get_sectorsize(pr),
  54                 blkid_parttable_get_type(root_tab),
  55                 (intmax_t)blkid_parttable_get_offset(root_tab),
  56                 blkid_parttable_get_id(root_tab));
  57
  58         /*
  59          * List partitions
  60          */
  61         nparts = blkid_partlist_numof_partitions(ls);
  62         if (!nparts)
  63                 goto done;
  64
  65         for (i = 0; i < nparts; i++) {
  66                 const char *p;
  67                 blkid_partition par = blkid_partlist_get_partition(ls, i);
  68                 blkid_parttable tab = blkid_partition_get_table(par);
  69
  70                 printf("#%d: %10llu %10llu  0x%x",
  71                         blkid_partition_get_partno(par),
  72                         (unsigned long long) blkid_partition_get_start(par),
  73                         (unsigned long long) blkid_partition_get_size(par),
  74                         blkid_partition_get_type(par));
  75
  76                 if (root_tab != tab)
  77                         /* subpartition (BSD, Minix, ...) */
  78                         printf(" (%s)", blkid_parttable_get_type(tab));
  79
  80                 p = blkid_partition_get_name(par);
  81                 if (p)
  82                         printf(" name='%s'", p);
  83                 p = blkid_partition_get_uuid(par);
  84                 if (p)
  85                         printf(" uuid='%s'", p);
  86                 p = blkid_partition_get_type_string(par);
  87                 if (p)
  88                         printf(" type='%s'", p);
  89
  90                 putc('\n', stdout);
  91         }
  92
  93 done:
  94         blkid_free_probe(pr);
  95         return EXIT_SUCCESS;
  96 }