How do I check size/date of a file in ANSI C?

[Karlos]

Why not simply write a wrapper function that does the job you need and simply have the implementation of that function #ifdef AMIGA ?

[Karlos]

Don't both systems measure time (32-bit integer) as the number of seconds since a particular epoch date?

If so, provided you know the difference between them. If memory serves, the Unix epoch is 00:00:00 Jan 01 1970 and the Amiga epoch is 00:00:00 Jan 01 1978

I would assume, if you evaluate the amiga epoch date as a unix datestamp you have a displacement you can use to convert an amiga 32-bit datestamp to a unix one and vice versa.