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Date: Mon, 21 Sep 2015 21:21:13 +0100
From: Peter Stephenson <p.w.stephenson@ntlworld.com>
To: zsh-workers@zsh.org
Subject: Re: Two issues found with -fsanitize=undefined
Message-ID: <20150921212113.74706d86@ntlworld.com>
In-Reply-To: <20150921200413.GA8913@x4>
References: <20150917075759.GA24365@x4>
	<20150921201306.0017146b@ntlworld.com>
	<20150921200413.GA8913@x4>
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On Mon, 21 Sep 2015 22:04:13 +0200
Markus Trippelsdorf <markus@trippelsdorf.de> wrote:
> Yes:
> matchbuflen: (null) with no matchbuf: 0
> It looks like the issue doesn't happen with a -DDEBUG build.
> I've changed the DPUTS line to:
>  fprintf(stderr, "matchbuflen: %s with no matchbuf: %x", matchbuf, matchbuflen);

That's fine.  If matchbuf is NULL, matchbuflen *should* be 0.

I presume you're missing that

  DPUTS(matchbuflen, "matchbuflen with no matchbuf");

is (roughly) equivalent to

  if (matchbuflen)
     fprintf(stderr, "matchbuflen with no matcbuf");

pws