From: Zefram <A.Main@dcs.warwick.ac.uk>
To: hzoli@cs.elte.hu (Zoltan Hidvegi)
Cc: A.Main@dcs.warwick.ac.uk, zsh-workers@math.gatech.edu
Subject: Re: (NULL == 0) ?
Date: Mon, 27 May 1996 23:54:34 +0100 (BST) [thread overview]
Message-ID: <26886.199605272254@stone.dcs.warwick.ac.uk> (raw)
In-Reply-To: <199605272241.AAA02676@bolyai.cs.elte.hu> from "Zoltan Hidvegi" at May 28, 96 00:41:30 am
>Bart wrote that ANSI C guarantees ASCII in the cases we need so that should
>not cause any problems.
C doesn't guarantee *any* use of ASCII. It does make some guarantees
about the character set, but nothing involving actual ASCII.
(Basically, all the characters that C uses, plus the characters with
escapes like '\a', must be in the character set and distinct, and none
may have the value 0.)
> I do not see where is is assumed that a char has 8
>bits othar than buffer sizes. We do assume that char has at least 8 bits
>but that's OK.
ZLE has some 256 element tables indexed by unsigned chars that are read
from the tty. If char has more than 8 bits, the tables need to be made
bigger. There are a couple of `& 0xff's, but they're easily fixed.
>Here struct iparam is used for initialisation. It is used instead of
>struct param since initialisation of a union might cause problems.
There's definitely a problem here. sizeof(long) > sizeof(void *) isn't
an unreasonable situation. In fact, it makes a great deal of sense to
have 64-bit longs and 32-bit pointers on Sparc processors. On Sparc
v9, the natural size of int and void * is 64 bits (though 32-bit
pointers are still possible), and 128-bit longs would be sensible. As
a union isn't usable here, should we perhaps have two distinct iparam
types, one for integers and one for pointers?
-zefram
next prev parent reply other threads:[~1996-05-27 23:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-05-25 14:38 clwords bugfix Zefram
1996-05-25 18:02 ` Richard Coleman
1996-05-25 20:52 ` Zefram
1996-05-25 21:25 ` (NULL == 0) ? Richard Coleman
1996-05-25 22:00 ` Zefram
1996-05-27 0:00 ` Zoltan Hidvegi
1996-05-27 6:39 ` Bart Schaefer
1996-05-27 7:29 ` anthony baxter
1996-05-27 13:07 ` Zefram
1996-05-27 22:00 ` Zoltan Hidvegi
1996-05-27 22:11 ` Zefram
1996-05-27 22:41 ` Zoltan Hidvegi
1996-05-27 22:54 ` Zefram [this message]
1996-05-28 4:54 ` Bart Schaefer
1996-05-27 23:36 ` Bart Schaefer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=26886.199605272254@stone.dcs.warwick.ac.uk \
--to=a.main@dcs.warwick.ac.uk \
--cc=hzoli@cs.elte.hu \
--cc=zsh-workers@math.gatech.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).