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Date: Fri, 13 Jan 2017 10:48:58 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Awk print statement alters the argument variable's content
Message-ID: <20170113094858.GG23119@calimero.vinschen.de>
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References: <2241d4bbc7904b6aaf52d33fa820eab2 AT SESOEX0018 DOT global DOT scd DOT scania DOT com> <779832c0-e4dd-4528-aba2-ead6cae681b2 AT SystematicSw DOT ab DOT ca>
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On Jan 13 01:31, Brian Inglis wrote:
> On 2017-01-12 05:26, Lundberg Christer wrote:
> > This program run with GNU awk 4.1.4 (currently installed with
> > Cygwin):
> >=20
> >   awk '
> >     BEGIN { OFMT=3D"%.8g"
> >             buf =3D 1+0.1
> >             buf =3D buf "a"
> >             print "Length before print:", length(buf)
> >             print buf " "
> >             print buf
> >             print buf " "
> >             print "Length after print:", length(buf)
> >           }
> >   '
> >=20
> > produces the following output on our system:
> >=20
> > Length before print: 4
> > 1.1a=20
> > 1.1
> > 1.1=20
> > Length after print: 3
> >=20
> > so it appears that the "print buf" statement unexpectedly alters the
> > content of buf.
> > With awk 4.1.3, we got the expected output
> >=20
> > Length before print: 4
> > 1.1a=20
> > 1.1a
> > 1.1a=20
> > Length after print: 4
>=20
> Confirmed problem with any OFMT except default or %.6g, also goes=20
> away if you change awk line 3 to: buf =3D "" buf "a":

It's an upstream bug.  I asked on the gawk ML.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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