iptc_zerro_entries segfaults, why?

[Peteris Krumins <newsgroups@xxxxx>]

Hi,

 i am developing some tool which uses libtc to manage rules etc.
 unfortunately iptc_zerro_entries (neither iptc_flush_entries and
 others which require (const IPT_CHAINLABEL chain, TC_HANDLE_T
 *handle) as parameters) does not want to work: as soon as
 called - segfaults.

 code (simpified, might have a typo) is like this:

--/
 const char *table = "filter";
 ...
 iptc_handle_t h;
 int ret=0;
 const char *c = NULL;
 h = iptc_init(table);

 if (!h){
    .. err handler
 }
 for (c=iptc_first_chain(&h);
      c;
      c=iptc_next_chain(&h)) {

      printf("in filter found: '%s'\n",c);
      /* prints "in filter found: 'INPUT'" */
      printf("zeroing..\n");
      ret = iptc_zerro_entries(c,&h);
      /* segfaults right here [1] */
      ...
 }
--/

[1] i see the prototype of iptc_zerro_entries:
    TC_ZERO_ENTRIES(const IPT_CHAINLABEL chain, TC_HANDLE_T *handle);
    IPT_CHAINLABEL is 'typedef char ipt_chainlabel[32]'

    exactly the same thing is done in iptables, only iptables have
    zero_entries function.

 so what could be wrong?

 compile w/:
gcc -W -Wall -I<ipt include dir> -rdynamic \
-o <executable> <src> \
<path to>/iptables.o <path to/libiptc>/libiptc.a \
-ldl -lnsl


P.Krumins