volname.c 1.9 KB

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  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. * mods from distributed source (eject-2.0.13) are by
  27. * Matthew Stoltenberg <d3matt@gmail.com>
  28. */
  29. //config:config VOLNAME
  30. //config: bool "volname (1.6 kb)"
  31. //config: default y
  32. //config: help
  33. //config: Prints a CD-ROM volume name.
  34. //applet:IF_VOLNAME(APPLET(volname, BB_DIR_USR_BIN, BB_SUID_DROP))
  35. //kbuild:lib-$(CONFIG_VOLNAME) += volname.o
  36. //usage:#define volname_trivial_usage
  37. //usage: "[DEVICE]"
  38. //usage:#define volname_full_usage "\n\n"
  39. //usage: "Show CD volume name of the DEVICE (default /dev/cdrom)"
  40. #include "libbb.h"
  41. int volname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  42. int volname_main(int argc UNUSED_PARAM, char **argv)
  43. {
  44. int fd;
  45. char buffer[32];
  46. const char *device;
  47. device = "/dev/cdrom";
  48. if (argv[1]) {
  49. device = argv[1];
  50. if (argv[2])
  51. bb_show_usage();
  52. }
  53. fd = xopen(device, O_RDONLY);
  54. xlseek(fd, 32808, SEEK_SET);
  55. xread(fd, buffer, 32);
  56. printf("%32.32s\n", buffer);
  57. if (ENABLE_FEATURE_CLEAN_UP) {
  58. close(fd);
  59. }
  60. return 0;
  61. }