Function build_res_buf_from_sip_req

msg_translator.c:2480–2762

char * build_res_buf_from_sip_req( unsigned int code, const str *text ,str *new_tag,
		struct sip_msg* msg, unsigned int *returned_len, struct bookmark *bmark)
{
	char *buf, *p, *received_buf, *rport_buf, *warning_buf;
	char *content_len_buf, *after_body, *totags;
	unsigned int len, foo, received_len, rport_len;
	unsigned int warning_len, content_len_len;
	struct hdr_field *hdr;
	struct lump_rpl *lump, *body;
	int i;
	str to_tag;

	body = 0;
	buf=0;
	to_tag.s = 0;
	to_tag.len = 0;
	received_buf=rport_buf=warning_buf=content_len_buf=0;
	received_len=rport_len=warning_len=content_len_len=0;

	/* force parsing all headers -- we want to return all
	Via's in the reply and they may be scattered down to the
	end of header (non-block Vias are a really poor property
	of SIP :( ) */
	if (parse_headers( msg, HDR_EOH_F, 0 )==-1) {
		LM_ERR("parse_headers failed\n");
		goto error00;
	}

	/*computes the length of the new response buffer*/
	len = 0;

	/* check if rport needs to be updated */
	if ( (msg->msg_flags&FL_FORCE_RPORT)||
		(msg->via1->rport /*&& msg->via1->rport->value.s==0*/)){
		if ((rport_buf=rport_builder(msg, &rport_len))==0){
			LM_ERR("rport_builder failed\n");
			goto error00;
		}
		if (msg->via1->rport)
			len -= msg->via1->rport->size+1; /* include ';' */
	}

	/* check if received needs to be added or via rport has to be added */
	if (rport_buf || received_test(msg)) {
		if ((received_buf=received_builder(msg,&received_len))==0) {
			LM_ERR("received_builder failed\n");
			goto error01;
		}
	}

	/* first line */
	len += SIP_VERSION_LEN + 1/*space*/ + 3/*code*/ + 1/*space*/ +
		text->len + CRLF_LEN/*new line*/;
	/* copy the TO hdr */
	if (msg->to) {
		if (new_tag && new_tag->len) {
			to_tag=get_to(msg)->tag_value;
			if (to_tag.len )