[Simh] simh and support for large files under OS X

[Galen Tackett]

It looks like simh doesn't currently support large files (over 2 GB) 
under OS X.

I'm no expert on simh or on OS X and Unix programming, but it looks 
like the necessary code in sim_fio.c could already be there, or might 
easily be added.

Again,  I'm no expert, but I think OS X provides such support. Though 
its fseek() only accepts 32 bit offsets I can see in types.h that off_t 
is a 64 bit integer and that lseek() accepts 64 bit offsets.

Is anyone familiar enough with this area to address how difficult it 
would be to make simh do this?

And contrary to documentation, compiling with USE_INT64 and USE_ADDR64 
does not enable large file support--at least, not on OS X.  It appears 
that the required code in sim_fio.c  is currently conditinalized 
against the operating system (currently Alpha VMS or Unix, Linux, and 
Windows 32) and NOT on 64 bit addressing.

Your ideas are welcome.

Thanks,

Galen