[Bug 86485] [patch] hexdump(1): hexdump -s speedup on /dev

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=86485

--- Comment #15 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kevans
Date: Fri Jan  5 01:46:41 UTC 2018
New revision: 327567
URL: https://svnweb.freebsd.org/changeset/base/327567

Log:
  hexdump(1): Speed up -s flag on devices

  Using the -s flag on devices is extraordinarily slow due to using fseek(3) a
  little too conservatively. Address this by using fseek on character/block
  devices as well, falling back to getchar(3) only if we fail to seek or we're
  operating on tape drives, where fseek may succeed while not actually being
  supported.

  PR:           86485
  Submitted by: arundel (originally; modified since then)
  Reviewed by:  cem
  Differential Revision:        https://reviews.freebsd.org/D10939

Changes:
  head/usr.bin/hexdump/display.c

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