[Bug 204602] parse() in boot loader interp_parse.c is too naive about quotes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204602

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: allanjude
Date: Sat Jul 30 17:53:37 UTC 2016
New revision: 303556
URL: https://svnweb.freebsd.org/changeset/base/303556

Log:
  Improve boot loader quote parsing

  parse() is the boot loader's interp_parse.c is too naive about quotes

  both single and double quotes were allowed to be mixed, and single
  quotes did not follow the usual semantics (re variable expansion).

  The old code did not check for terminating quotes

  This update implements:
   * distinguishing single and double quote
   * variable expansion will not be done inside single quote protected area
   * will preserve inner quote for values like "value 'some list'"
   * ending quote check.

  this diff does not implement ending quote order check, it shouldn't
  be too hard, needs some improvements on parser state machine.

  PR:           204602
  Submitted by: Toomas Soome <tsoome at me.com>
  Relnotes:     yes
  Differential Revision:        https://reviews.freebsd.org/D6000

Changes:
  head/sys/boot/common/interp_parse.c

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