Properly propagate parameters with no value

modules/dialog/dlg_tophiding.c

@@ -189,11 +189,17 @@ int dlg_replace_contact(struct sip_msg* msg, struct dlg_cell* dlg)
 				for (el=th_param_list;el;el=el->next) {
 					/* we just iterate over the unknown params */
 					for (i=0;i<ctu.u_params_no;i++) {
+						LM_INFO("ZZZ - found param [%.*s]=[%.*s]\n",ctu.u_name[i].len,ctu.u_name[i].s,ctu.u_val[i].len,ctu.u_val[i].s);
 						if (el->param_name.len == ctu.u_name[i].len &&
-						memcmp(el->param_name.s,ctu.u_name[i].s,
-						       el->param_name.len) == 0)
-							suffix_len += ctu.u_name[i].len +
-							ctu.u_val[i].len + 2; /* ; and = */
+						(memcmp(el->param_name.s,ctu.u_name[i].s,
+						       el->param_name.len) == 0)) {
+							if (ctu.u_val[i].len)
+								suffix_len += 1 /* ; */ + ctu.u_name[i].len +
+								ctu.u_val[i].len + 1; /* = and value */
+							else
+								suffix_len += 1 /* ; */ + ctu.u_name[i].len;
+						}
+
 					}
 				}
 			}
@@ -238,9 +244,11 @@ int dlg_replace_contact(struct sip_msg* msg, struct dlg_cell* dlg)
 					*p++ = ';';
 					memcpy(p,ctu.u_name[i].s,ctu.u_name[i].len);
 					p+=ctu.u_name[i].len;
-					*p++ = '=';
-					memcpy(p,ctu.u_val[i].s,ctu.u_val[i].len);
-					p+=ctu.u_val[i].len;
+					if (ctu.u_val[i].len) {
+						*p++ = '=';
+						memcpy(p,ctu.u_val[i].s,ctu.u_val[i].len);
+						p+=ctu.u_val[i].len;
+					}
 				}
 			}
 		}