miscutils/volname.c

   1 /*
   2  * Reads and displays CD-ROM volume name
   3  *
   4  * Several people have asked how to read CD volume names so I wrote this
   5  * small program to do it.
   6  *
   7  * usage: volname [<device-file>]
   8  *
   9  * Copyright (C) 2000-2001 Jeff Tranter (tranter@pobox.com)
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26 /*
  27  * mods from distributed source (eject-2.0.13) are by
  28  * Matthew Stoltenberg <d3matt@gmail.com>
  29  */
  30 //config:config VOLNAME
  31 //config:       bool "volname (1.9 kb)"
  32 //config:       default y
  33 //config:       help
  34 //config:       Prints a CD-ROM volume name.
  35
  36 //applet:IF_VOLNAME(APPLET(volname, BB_DIR_USR_BIN, BB_SUID_DROP))
  37
  38 //kbuild:lib-$(CONFIG_VOLNAME) += volname.o
  39
  40 //usage:#define volname_trivial_usage
  41 //usage:       "[DEVICE]"
  42 //usage:#define volname_full_usage "\n\n"
  43 //usage:       "Show CD volume name of the DEVICE (default /dev/cdrom)"
  44
  45 #include "libbb.h"
  46
  47 int volname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  48 int volname_main(int argc UNUSED_PARAM, char **argv)
  49 {
  50         int fd;
  51         char buffer[32];
  52         const char *device;
  53
  54         device = "/dev/cdrom";
  55         if (argv[1]) {
  56                 device = argv[1];
  57                 if (argv[2])
  58                         bb_show_usage();
  59         }
  60
  61         fd = xopen(device, O_RDONLY);
  62         xlseek(fd, 32808, SEEK_SET);
  63         xread(fd, buffer, 32);
  64         printf("%32.32s\n", buffer);
  65         if (ENABLE_FEATURE_CLEAN_UP) {
  66                 close(fd);
  67         }
  68         return 0;
  69 }