Re: how to use the MACROs?

ww kirjoittaa torstaina, 18. heinäkuuta 2002, kello 04:29:i am puzzled 
by the macros used in the source code of kannel
> just like the difinition of the MSG and the State-machine
>  
> here is the source code in the wtls_state-decl.h
>  ROW(CREATING,
>     SEC_Exception_Req,
>     1,
>     {
>             info(0,"----------------begin a new 12 machine-----------");
>             /* Send off a T_Unitdata_Req containing an exception as 
> specified */
>             send_alert(event->u.SEC_Exception_Req.alert_level,
>                        event->u.SEC_Exception_Req.alert_desc, 
> wtls_machine);
>     },
>     CREATING)

This is directly from state table:

ROW(state,
          event,
          condition,
          action,
          state after action)

Condition 1 means always, {} means no action. Action is a normal C block.

>  the source code in the wtls.c
>  
> if(event->type == T_Unitdata_Ind)
>  {
> if( wtls_machine->encrypted )
>  {
>  info(0, "lyl: start pdu list ");
>  wtls_decrypt_pdu_list(wtls_machine, event->u.T_Unitdata_Ind.pdu_list);
>  }
>  info(0, "lyl: end pdu list ");
>  du_list);
>  }
> #define STATE_NAME(state)
>      #define ROW(wtls_state, event_type, condition, action, 
> next_state) \
>              if (wtls_machine->state == wtls_state && \
>                 event->type == event_type && \
>                 (condition)) { \
>                 action \
>                 wtls_machine->state = next_state; \
>                 debug("wap.wtls", 0, "WTLS %ld: New state %s", 
> wtls_machine->mid
> , #next_state); \
>              } else
>      #include "wtls_state-decl.h"
>              {
>                 error(0, "WTLS: handle_event: unhandled event!");
>                 debug("wap.wtls",0, "lyl: event->type = %d", 
> event->type);
>                 wap_event_destroy(event);
>                 return;
>              }

Do not touch code in wtls.c, edit wtls_state-decl,h instead. Either 
change
code in action part in normal way or add a new row to the state table 
(for
unhandled events).

Aarno