719 static PyObject *
720 urj_pyc_peek (urj_pychain_t *self, PyObject *args)
721 {
722     long unsigned adr;
723     uint32_t val;
724     urj_bus_area_t area;
725     urj_chain_t *urc = self->urchain;
726 
727     if (!PyArg_ParseTuple (args, "i", &adr))
when PyArg_ParseTuple() succeeds
taking False path
728         return NULL;
729 
730     if (!urj_pyc_precheck (urc, UPRC_CBL|UPRC_BUS))
when considering value == (int)0 from chain.c:730
taking True path
731         return NULL;
732 
733     URJ_BUS_PREPARE (urj_bus);
734     URJ_BUS_AREA (urj_bus, adr, &area);
735     val = URJ_BUS_READ (urj_bus, adr);
736 
737     switch (area.width)
738     {
739     case 8:
740         val &= 0xff;
741         break;
742     case 16:
743         val &= 0xffff;
744         break;
745     default:
746         break;
747     }
748     return Py_BuildValue ("i", val);
749 }
returning (PyObject*)NULL without setting an exception