LINEBUF testing

Is there any way to test the size of the buffer (the one referenced by
LINEBUF) from within a procmail script?  I'd like to do something like:

:0 HB
* ()\/(spamdomain\.one|\
       spamdomain\.two|\
       ...)
{
   :0 c
   * $BUFFER > $LINEBUF - 100
   | echo "Buffer is approaching max for this recipe"

   :0
   spam
}

Right now my log analyser flags buffer overflows *after/when* they've
occured.  I'd like to be able to catch them *before* they occur.

                                - fleet -


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