[Bug 189284] dd(1): may write junk if conv=sparse with obs < ibs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=189284

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: thomas
Date: Thu Feb 18 08:44:17 UTC 2016
New revision: 295749
URL: https://svnweb.freebsd.org/changeset/base/295749

Log:
  Reorganize the handling all-zeroes terminal block in sparse mode

  The intent of the previous code in that case was to force
  an explicit write, but the implementation was incorrect, and
  as a result the write was never performed. This new implementation
  instead uses ftruncate(2) to extend the file with a trailing hole.

  Also introduce regression tests for these cases.

  PR: 189284
  (original PR whose fix introduced this bug)

  PR: 207092

  Differential Revision:        D5248
  Reviewed by:  sobomax,kib
  MFC after:    2 weeks

Changes:
  head/bin/dd/Makefile
  head/bin/dd/dd.c
  head/bin/dd/dd.h
  head/bin/dd/gen.c
  head/bin/dd/ref.obs_zeroes

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