linux-kernel - Re: [PATCH v4 1/2] system_data

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Message-ID: <20201003074807.swdpnwaq2rzigadl@localhost.localdomain>
Date:   Sat, 3 Oct 2020 17:48:09 +1000
From:   "G. Branden Robinson" <g.branden.robinson@...il.com>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     Alejandro Colomar <colomar.6.4.3@...il.com>,
        Paul Eggert <eggert@...ucla.edu>, linux-man@...r.kernel.org,
        gcc-patches@....gnu.org, libc-alpha@...rceware.org,
        linux-kernel@...r.kernel.org, jwakely.gcc@...il.com,
        David.Laight@...LAB.COM
Subject: Re: [PATCH v4 1/2] system_data_types.7: Add 'void *'

At 2020-10-03T09:10:14+0200, Michael Kerrisk (man-pages) wrote:
> On 10/2/20 10:27 PM, Alejandro Colomar wrote:
> > On 2020-10-02 22:14, Paul Eggert wrote:
> >  > On 10/2/20 11:38 AM, Alejandro Colomar wrote:
> >  >
> >  >> .I void *
> >  >>
> >  >> renders with a space in between.
> >  >
> >  > That's odd, as "man(7)" says "All of the arguments will be
> >  > printed next to each other without intervening spaces". I'd play
> >  > it safe and quote the arg anyway.
> > 
> > Oops, that's a bug in man(7).  Don't worry about it.
> 
> I'm not sure where that text in man(7) comes from. However, for
> clarity I would normally also use quotes in this case.
> 
> > Michael, you might want to have a look at it.
> > 
> > I'll also add Branden, who might have something to say about it.
> 
> Yes, maybe Branden can add some insight.

The "short" answer[1] is that I think Alex is correct; Paul's caution is
unwarranted and arises from confusion with the font alternation macros
of the man(7) macro package.  Examples of the latter are .BI and .BR.
Those set their even-numbered arguments in one font and odd-numbered
arguments in another, with no space between them.  That suppression of
space is the reason they exist.  With the "single-font" macros like .B
and .I[2], if you don't want space, don't type it.

I could say more, including an annotated explanation of the groff and
Version 7 Unix man(7) implementations of the I macro, if desired.  :)

Regards,
Branden

[1] since as everyone knows, I struggle with brevity
[2] I (and others) discourage use of .SM and .SB because they can't be
distinguished from ordinary roman and bold type, respectively, on
terminals.

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