Reading NaN & Inf in mex files

[gOS]

I've got a function which reads in text files formatted in a specific way.
Thanks to windows, these files can sometimes contain values like 1.#INF or
1.#IND or even 1.#QNAN. As you can see these are window's own versions of
Inf and NaN. These can also be negative.

I was able to produce an NaN value which Octave recognized as NaN with:
double nan = std::numeric_limits<long double>::quiet_NaN();

However, double inf = std::numeric_limits<long double>::infinity(); was
interpreted somewhere as meaning NaN as well instead of inf.

Does anyone have any suggestions as to how to correct this?
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