use standard functions for checking
authoroetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Fri, 16 Dec 2011 16:13:23 +0000 (16:13 +0000)
committeroetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Fri, 16 Dec 2011 16:13:23 +0000 (16:13 +0000)
git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@2241 a5681a0c-68f1-0310-ab6d-d61299d08faa


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