[AGENT++] build_vb and too many variables

[Jacek Poplawski]

 > May be you can consider to upgrade to the latest SNMP++/AGENT++
We are using 3.2.20.

 > which does no longer have a fixed upper limit for the VBs in a PDU. 
Otherwise you may test the constant MAX_VBS defined in config_snmp_pp.h

The question is not how to increase number of variables, but how to 
check if given number of variables will fit there.
According to RFC (if I understand it correctly) one should put part of 
variables into PDU, not return error.
Such test is in commercial SNMP testsuite, I want to pass it.

we are currently calling:

scopedPDUPtr = build_vb(pdu, scopedPDUPtr, &maxLen);

interesting part of build_vb from asn1.cpp:

  int vb_length;
  int length = MAX_SNMP_PACKET;

  // build varbinds into packet buffer
  for(vp = pdu->variables; vp; vp = vp->next_variable)
  {
    cp = snmp_build_var_op( cp, vp->name, &vp->name_length,
                vp->type, vp->val_len,
                (unsigned char *)vp->val.string,
                &length);
    if (cp == NULL) return 0;
  }
  vb_length = cp - tmp_buf.get_ptr();
  *buf_len -= vb_length;
  if (*buf_len <= 0) return 0;

This code doesn't check how many variables will fit, if buf_len is 
smaller than vb_length it just return error :-(
Can I somehow calculate vb_length easier way than by calling build_vb? 
Or is there any build_vb alternative available?

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