netdev - Re: [PATCH iproute2] Use libbsd for strlcpy if available

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Message-ID: <1540827471.29722.9.camel@debian.org>
Date:   Mon, 29 Oct 2018 15:37:51 +0000
From:   Luca Boccassi <bluca@...ian.org>
To:     David Ahern <dsahern@...il.com>, netdev@...r.kernel.org
Cc:     stephen@...workplumber.org
Subject: Re: [PATCH iproute2] Use libbsd for strlcpy if available

On Mon, 2018-10-29 at 09:27 -0600, David Ahern wrote:
> On 10/29/18 4:46 AM, Luca Boccassi wrote:
> > If libc does not provide strlcpy check for libbsd with pkg-config
> > to
> > avoid relying on inline version.
> > 
> > Signed-off-by: Luca Boccassi <bluca@...ian.org>
> > ---
> > This allows distro maintainers to be able to choose to reduce
> > duplication and let this code be maintained in one place, in the
> > external library.
> > 
> >  configure | 12 ++++++++++--
> >  1 file changed, 10 insertions(+), 2 deletions(-)
> > 
> > diff --git a/configure b/configure
> > index 744d6282..1dd9ce84 100755
> > --- a/configure
> > +++ b/configure
> > @@ -330,8 +330,16 @@ EOF
> >      then
> >  	echo "no"
> >      else
> > -	echo 'CFLAGS += -DNEED_STRLCPY' >>$CONFIG
> > -	echo "yes"
> > +	if ${PKG_CONFIG} libbsd --exists
> > +	then
> > +		echo 'CFLAGS += -include' `${PKG_CONFIG} libbsd --
> > variable=includedir`'/bsd/string.h' \
> > +			`${PKG_CONFIG} libbsd --cflags` >>$CONFIG
> > +		echo 'LDLIBS +=' `${PKG_CONFIG} libbsd --libs` >>
> > $CONFIG
> > +		echo "no"
> > +	else
> > +		echo 'CFLAGS += -DNEED_STRLCPY' >>$CONFIG
> > +		echo "yes"
> > +	fi
> >      fi
> >      rm -f $TMPDIR/strtest.c $TMPDIR/strtest
> >  }
> > 
> 
> How long has libbsd had an implementation of strlcpy? Would be safer
> to
> have a compile test to verify libbsd has it.

Hi,

0.0 from 10+ years ago has it, so I think we are safe :-)

https://gitlab.freedesktop.org/libbsd/libbsd/blob/0.0/include/bsd/string.h#L34

-- 
Kind regards,
Luca Boccassi
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