Bug in 4.3/4.2 stdio with "w+"?

[Doug Gwyn]

In article <1871 at uw-beaver> bnfb at uw-beaver.UUCP writes:
- This program worked under 4.2bsd but not under 4.3bsd.
-  ...
- Is this a real bug or am I just lost?

It's a real bug.