IOSTDF_UD          41 lib_io.c       #define IOSTDF_IOF(L, id)	((IOFileUD *)uddata(IOSTDF_UD(L, (id))))
IOSTDF_UD         250 lib_io.c             setudataV(L, L->base, IOSTDF_UD(L, GCROOT_IO_OUTPUT));
IOSTDF_UD         477 lib_io.c           setudataV(L, L->top++, IOSTDF_UD(L, id));
IOSTDF_UD         501 lib_io.c           setudataV(L, L->base, IOSTDF_UD(L, GCROOT_IO_INPUT));