From: Lynn Winebarger <owinebar@free-expression.org>
Cc: guile-devel@gnu.org
Subject: Re: SCM_PTR_LE ?
Date: Thu, 1 Aug 2002 12:15:10 -0500 [thread overview]
Message-ID: <0208011211330C.05101@locke.free-expression.org> (raw)
In-Reply-To: <lj4ree5y7l.fsf@burns.dt.e-technik.uni-dortmund.de>
On Thursday 01 August 2002 11:40, Marius Vollmer wrote:
> same array or a single block returned from malloc. A consequence
> would be that you can not reliably test whether a pointer does point
> into some object, since the results are not defined when it points
> outside. For example, is the following guaranteed to print "sane"?
>
> char block1[100];
> char block2[100];
>
> char *ptr = block1 + 50;
>
> if (ptr >= block2 && ptr < block2+100)
> printf ("sane\n");
> else
> printf ("insane\n");
>
> I don't know.
That would be not, as it prints insane on my athlon-based
linux system. Now if you tried block2 + 150, or block1 - 50,
we might have an interesting question.
Lynn
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next prev parent reply other threads:[~2002-08-01 17:15 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-27 18:50 SCM_PTR_LE ? Han-Wen
2002-07-30 17:00 ` Marius Vollmer
2002-07-30 22:24 ` Han-Wen
2002-08-01 16:40 ` Marius Vollmer
2002-08-01 17:09 ` Mr. Peter Ivanyi
2002-08-01 17:15 ` Lynn Winebarger [this message]
2002-08-01 20:08 ` Marius Vollmer
2002-08-01 17:16 ` Han-Wen Nienhuys
2002-08-01 17:24 ` Han-Wen Nienhuys
2002-08-01 20:09 ` Marius Vollmer
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