 |
HS_NULL |
Constant |
A null symbol constant.
HS_NULL is a null symbol. Many TIOS functions returns such a symbol
in case of an error. Note that you can't check whether a some variable is HS_NULL using
the "==" operator because HS_NULL is not scalar, i.e. you can't
write something like
if (hs == HS_NULL) ...
Instead, check the folder field of HSym structure: if it is zero,
the whole structure is HS_NULL, because TIOS never creates HSym
structures in which the folder field is zero and the offset field is nonzero.