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Date: Wed, 3 Aug 2022 12:47:56 +0000
From: Joseph Myers <joseph@...esourcery.com>
To: <libc-coord@...ts.openwall.com>
CC: enh <enh@...gle.com>
Subject: Re: anyone else working on %b?
On Tue, 2 Aug 2022, Keith Packard wrote:
> Should scanf's %i format parse the leading 0b/0B to indicate
> binary?
Yes. (Formally that's a consequence of the introduction of binary
literals in C23 - a change to the language specification with consequences
for library requirements - since strtol base 0 accepts literal prefixes
and %i is defined in terms of strtol base 0.)
> Should %b/%B permit a leading 0b/0B?
Yes. (There's no scanf %B defined or mentioned in recommended practice in
C23 since it wouldn't be any different from %b.) scanf %b is defined in
terms of strtol base 2 and the same changes that added %b support to C23
also added a specification that strtol base 2 accepts those prefixes.
--
Joseph S. Myers
joseph@...esourcery.com
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