2007/10/9, Jerry Richards <[EMAIL PROTECTED]>:
> What is the proper method in the NUA callback function to check whether a
> SIP message field is valid. In some cases, if my callback function tries to
> access a SIP message field that is not present, it can get a segmentation
> fault.
A non-null pointer in sip_t structure, like
if (!sip->sip_contact) { /* Contact not present */
}
(or if you prefer checking explicitly with NULL):
if (sip->sip_contact == NULL) { /* Contact not present */
}
or, in case of extension headers, an accessor function returning NULL:
sip_remote_party_id_t *rpid = sip_remote_party_id(sip);
if (rpid == NULL) { /* No remote-party-id
}
--
Pekka.Pessi mail at nokia.com
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