Undocumented features

[Dave Maxey]

As Guy Harris put it:
> Of course, just because something is a documented feature doesn't guarantee
> that it works either...

Take for instance fseek(3S) in 4.1 (same thing or very similar in system III):
	....
	Rewind(stream) is equivalent to fseek(stream, 0L, 0).

	SEE ALSO
		lseek(2), fopen(3)

	DIAGNOSTICS
		Fseek returns -1 for improper seeks.

System III documentation says that fseek returns non-zero for improper seeks,
zero otherwise. The truth of the matter is: rewind will return negative on
PROPER seeks. If you want to test your rewind status, use fseek(stream, 0L, 0).
This difference hardly makes rewind "equivalent" to fseek(stream, 0L, 0).

			- Dave Maxey (alias tbm)
			{seismo,mcnc,brl-bmd,allegra}!rlgvax!dave