[Bug 242225] "fstyp -l" does not report exfat filesystem volume label

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242225

--- Comment #13 from commit-hook at freebsd.org ---
A commit references this bug:

Author: cem
Date: Sun Dec 22 03:19:18 UTC 2019
New revision: 355996
URL: https://svnweb.freebsd.org/changeset/base/355996

Log:
  fstyp(8): Show exFAT volume labels with -l flag

  exfat is fundamentally the same design as fat32.  The superblock differs
  marginally, and there are some additional optional features irrelevant to
  fstype(8); the structure of dirents has changed slightly to enable, among
  other things, larger files; the directory entries are no longer DOS 8.3
  ASCII or local 8-bit encoding, but instead explicitly UCS-2-LE.

  (As a result, this change uses iconv to convert a found exfat volume label
  to the user's locale.)

  Locating the volume label is identical to FAT32: locate the root directory
  and walk through dirents until you find a volume label.  Like FAT32, follow
  the FAT chain between root directory clusters as necessary.

  PR:           242225
  Reported by:  Victor Sudakov <vas AT sibptus.ru>

Changes:
  head/usr.sbin/fstyp/exfat.c
  head/usr.sbin/fstyp/fstyp.c
  head/usr.sbin/fstyp/fstyp.h
  head/usr.sbin/fstyp/tests/fstyp_test.sh

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