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Date: Wed, 29 Feb 2012 09:37:12 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: 'more' segment faults with latest cygwin1.dll (1.7.11)
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On Feb 28 19:36, Yaakov (Cygwin/X) wrote:
> On Tue, 2012-02-28 at 11:24 +0100, Corinna Vinschen wrote:
> > On Feb 28 03:43, Yaakov (Cygwin/X) wrote:
> > > On Tue, 2012-02-28 at 09:18 +0100, Corinna Vinschen wrote:
> > > > It's a bug in more, afaics.  In case of pressing 'n', the search function
> > > > is called with a NULL buf argument.  However, the function calls
> > > > strlen(buf) without checking buf for NULL.  The indentation at this
> > > > point in the file looks like this  `if (strlen(buf) > 0) {' has been
> > > > added as a kind of patch.
> > > 
> > > Yes, I had to patch more(1) to use regcomp/regexec instead of
> > > re_comp/re_exec, which we don't have on Cygwin.  With your clarification
> > > I should be able to fix it easily.
> > 
> > Just an idea, instead of working around them, why not just add them
> > to the lib?  You could copy the FreeBSD implementation which just
> > implements them in terms of the regcomp/regexec API:
> > 
> > http://www.freebsd.org/cgi/cvsweb.cgi/~checkout~/src/lib/libcompat/4.3/re_comp.c?rev=1.1;content-type=text%2Fplain
> 
> I thought of that when I first ported util-linux, but these functions
> were already marked legacy in SUSv2 and removed from SUSv3, so I wasn't
> sure if we wanted to first add now what most libc's already consider
> cruft.
> 
> If you really think this should be added to Cygwin, I could do it, but I
> already have a fix for more(1) so I could do without.

Uh, that wasn't quite what I meant.  With "lib" I meant the "lib" subdir
in the util-linux source.  I was under the (wrong?) impression that the
result of `make' in the lib subdir creates a helper lib which is linked
to all executables in the collection.  Alternatively you could have
pasted them to the end of more.c, but since you have a fix now, it
doesn't matter anyway.

As for Cygwin, the aforementioned FreeBSD source builds out of the box
as part of Cygwin after you defined __DECONST.  But, like you, I'm not
sure it's such a terrible good idea to add such a long deprecated set of
functions.  OTOH, Linux provides them as well, just with the extra kick
that you have to include regex.h rather than unistd.h as on BSD.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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