Add ENsetlinknodes to DEF file and add a function check

src/epanet.c

@@ -3170,6 +3170,9 @@ int DLLEXPORT EN_setlinknodes(EN_ProjectHandle ph, int index, int node1, int nod
     EN_Project *p = (EN_Project*)ph;
     EN_Network *net = &p->network;
 
+    // Check that end and start nodes are not the same
+    if (node1 == node2) return set_error(p->error_handle, 222);
+    
     // Check that nodes exist
     if (node1 < 0 || node1 > net->Nnodes) return set_error(p->error_handle, 203);
     if (node2 < 0 || node2 > net->Nnodes) return set_error(p->error_handle, 203);

win_build/WinSDK/epanet2.def

@@ -13,6 +13,7 @@ EXPORTS
     ENgetlinkid                   = _ENgetlinkid@8                      
     ENgetlinkindex                = _ENgetlinkindex@8                   
     ENgetlinknodes                = _ENgetlinknodes@12                  
+    ENsetlinknodes                = _ENsetlinknodes@12                  
     ENgetlinktype                 = _ENgetlinktype@8                    
     ENgetlinkvalue                = _ENgetlinkvalue@12                  
     ENgetnodeid                   = _ENgetnodeid@8