in pjlib, there is a list head even if the list is empty, the last node's next ptr point to list head. On Mon, Feb 14, 2011 at 5:09 PM, john smith <pyroflares at gmail.com> wrote: > Hi Peter, > > Thanks for the reply.but if u think that the linklist employed singular > linked circular linked list then why does the link in the pjsip website say > that its is doubly linked list. > > check out the website. > http://www.pjsip.org/pjlib/docs/html/group__PJ__LIST.htm > > and if we assume that it is just a doubly linked list then how can we > insert the line > > hdr = rdata->msg_info.msg->hdr.next; > while (hdr != &rdata->msg_info.msg->hdr) { > > because this line tells me that it should be circular linked list > implementation. > I will appreciate a reply. > > Thanks in advance. > > Cheers..!!! > > > > ---------- Forwarded message ---------- > From: peteryzwei <peteryzwei@xxxxxxxxx> > Date: Fri, Feb 11, 2011 at 8:37 PM > Subject: Re: Problems Understanding the code > To: pjsip list <pjsip at lists.pjsip.org> > > > John, > look at sip_msg.h and list.h for the SIP headers structures. Macros are > used to define standard members of structures. Yes the linked list type is > singular linked circular lists. > I use grep or Visual Studio for finding symbols not defined in the current > file. > Pjsip does some quirky things like defining structures in .c files instead > of .h files. I sometimes move them into .h file when I need access to those > structs in another .c file. > > > --- On *Sun, 2/6/11, john smith <pyroflares at gmail.com>* wrote: > > > From: john smith <pyroflares@xxxxxxxxx> > Subject: Problems Understanding the code > To: "pjsip list" <pjsip at lists.pjsip.org> > Date: Sunday, February 6, 2011, 8:37 AM > > > Hi, > > I was going through the pjsip code and found that a lot of linked list is > used throughout the code to add new headers,remove and manupulate them. > but ,what i am unsure at the moment is the type of linked list used for it > (i guess we are using circular linked liist but i am not sure) > > how i guessed it... > in this function of pjsip pjsip_auth_clt_reinit_req > > the line hdr = rdata->msg_info.msg->hdr.next; > while (hdr != &rdata->msg_info.msg->hdr) { > > > tells me that hdr is pointing to the next instance and with the help of hdr > ponter we are traversing the entire linked list until we reach the same > position from where we started. > i would be really great if someone could point out the type of linked list > employed. > > Also,in the same functon i find this line.. > cached_auth->is_proxy = (hchal->type == PJSIP_H_PROXY_AUTHENTICATE); > > i tried to find (const pjsip_www_authenticate_hdr *hchal;) hcal->type i.e > to be precise* type* is the member i tried to find but to no avail,also > besides *type* i see many extensions such as *slen* and* next* which are > not part of the structure and are throughly used throughout the code. > > I am a beginner so please,overlook my silly questions and help me in > understanding the flow. > > > Thanks in Advance. > John. > > -----Inline Attachment Follows----- > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org <http://mc/compose?to=pjsip at lists.pjsip.org> > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20110214/f76d8b56/attachment.html>
