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Merged revisions 377915 via svnmerge from
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  r377915 | elguero | 2012-12-11 22:43:18 -0600 (Tue, 11 Dec 2012) | 17 lines

  Convert Dynamic Features Buffer To Use ast_str

  Currently, the buffer for the dynamic features list is set to a fixed size of
  128.  If the list is bigger than that, it results in the dynamic feature(s) not
  being recognized.

  This patch changes the buffer from a fixed size to a dynamic one.

  (closes issue ASTERISK-20680)
  Reported by: Clod Patry
  Tested by: Michael L. Young
  Patches:
      asterisk-20680-dynamic-features-v2.diff
                                       uploaded by Michael L. Young (license 5026)

  Review: https://reviewboard.asterisk.org/r/2221/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/team/mmichelson/threadpool@377916 65c4cc65-6c06-0410-ace0-fbb531ad65f3