Re: [Bug #14015] pty regressed again, breaking expect and gcc'stestsuite

[Alan Cox]

> After writing the above, the voices in my head started clamoring about 
> this "space allocated" vs "bytes buffered" thing, which I was obviously 
> aware of, but hadn't thought about as an issue.
> 
> And you know what? The thing about "space allocated" vs "bytes buffered" 
> is that writing _one_ byte (the '\r') can cause a lot more than one byte 
> to be allocated for a buffer (we do minimum 256-byte buffers)

Doh yes thats an utterly dumb bug on my part - we do have to work on
chars.

100% agree with the diagnosis
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