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From: Pietro Gagliardi <pietro10@mac.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
In-reply-to: <a7d531a84f842f26980f8cefd1623a11@terzarima.net>
Date: Mon,  7 Jul 2008 17:01:08 -0400
References: <a7d531a84f842f26980f8cefd1623a11@terzarima.net>
Subject: Re: [9fans] APE printf difference
Topicbox-Message-UUID: dded396a-ead3-11e9-9d60-3106f5b1d025

C89 does have such a requirement, in two places:

Section 5.1.2.3:
"...
- The input and output dynamics of interactive devices shall take
place as specified in 7.9.3. ... or line-buffered input appear as soon
as possible, to ensure that prompting messages actually appear prior
to a program waiting for input.
..."

Section 7.9.3:
"... Furthermore, characters are intended to be transmitted as a block
to the host environment when ... input is requested on an unbuffered
stream, or input is requested on a line buffered stream ..."

So there you go. I don't know about C99, but I do know POSIX/SUS are
designed to be aligned with standard C.

Pietro