The existing library for the Apple ][ doesn't implement C file
I/O. There are two hacks for the read() and write() routines in
place, which will make functions work that read from or write to stdout
(like printf()). However, these functions have some shortcomings which
won't be fixed, because they're going to be replaced anyway.
To be more concrete, this limitation means that you cannot use any of the following functions (and a few others):