[Bug 195792] awk mishandles [[:cntrl:]]

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195792

kdrakehp at zoho.com changed:

           What    |Removed                     |Added
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                 CC|                            |kdrakehp at zoho.com

--- Comment #1 from kdrakehp at zoho.com ---
Created attachment 174328
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174328&action=edit
Skip NUL to avoid preemptive truncation

The NUL character in cntrl is truncates the pattern, and an empty
pattern matches anything.  The attached patch skips NUL as a quick fix.

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