Please add a high-mem safe wrapper for DosQueryAppType()

[guest]

DosQueryAppType() is not listed in the high-mem supporting APIs and indeed it acts weird (returncode=87 and appType=0 whatever the real appType is) when being passed a char* as first argument that is located above 512MB. So it would be great, if it a SafeDosQueryAppType() wrapper could be written and then add it to os2safe.h.

[abwillis]

Not sure if you would rather have a separate ticket for it but as a place to keep track of it, WinUpper also was an unsafe call.

[guest]

Patch (1st try) to implement SafeDosQueryAppType

[guest]

Hmm, weird. Why does Trac only display the first part of the diff?

Anyway, again without even trying to compile libc (don't have time to even try) the diff I just attached is a first try to add a safe wrapper for DosQueryAppType(). Don't understand what the SAFE_DOS_FAILURE() is about but copied that from other wrappers. I guess the PSCZ macros also work for PSZs...

[bird]

(In [3387]) Added SafeDosQueryAppType and SafeWinUpper (both untested). Fixes #132.