Re: question about rpmdbInitIterator()

FlorianFesti <ffesti@xxxxxxxxxx> · Sat, 06 Nov 2010 22:02:37 +0100



    On 11/05/2010 03:48 AM, David Peterson wrote:
    Looking in rpmdb.h, I
        see the following
        function:
      

          rpmdbMatchIterator
        rpmdbInitIterator(rpmdb
        db, rpmTag rpmtag, const void* keyp, size_t keylen);
      

      My question is, what is the set
        of valid
        inputs that the function is supposed to
      

      handle for the 'keyp' parameter?
         For
        instance, is a regular _expression_ for
      

      matching package names ok, or is
        the
        set of valid inputs more constrained
      

      than that?

    
    It only allows either a string that is matched as is or NULL for
    all. You can use rpmdbSetIteratorRE to restrict the results
    (typically using  RPMTAG_PACKAGES, NULL for rpmdbInitIterator). Unfortunately this does not
    give you any performance benefit. RPM still loads and inspects all
    headers. Sorry, the API (and the implementation) isn't very helpful
    in this area...

    
    Florian

  
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