stdio broken in SysV?

[Clarence Dold]

in article <2010 at sauron.Columbia.NCR.COM>, wescott at micky.columbia.ncr.com (Mike Wescott) says:

> I am trying to port a program.  It blows up in fprintf because SysV
> stdio has the implicit assumption that a given file descriptor will
> be used by no more than one stdio stream.

> BTW the "implicit assumption" mentioned above is due to the fact that
> the array _bufendtab[] is indexed by fp->_file rather than by fp-_iob
> or built into the FILE structure itself.

>From fopen(3) man page:
"...input may not be directly followed by output" [later stated vice-versa]
"without an intervening fseek or rewind..."

which I believe will straighten out the _bufentab[fd] pointer.

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