Re: struct with one member: padding?

From	John Gordon <gordon@panix.com>
Newsgroups	comp.lang.c, comp.unix.programmer
Subject	Re: struct with one member: padding?
Date	2012-06-27 16:40 +0000
Organization	PANIX Public Access Internet and UNIX, NYC
Message-ID	<jsfd2q$r2u$1@reader1.panix.com> (permalink)
References	<jsfckr$drq$1@speranza.aioe.org>

Cross-posted to 2 groups.

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In <jsfckr$drq$1@speranza.aioe.org> "Mark" <mark_cruzNOTFORSPAM@hotmail.com> writes:

> struct in_addr
>   {
>      unsigned long s_addr;
>   };

> Does the Standard allow a C comiler to add padding in such structure? If it 
> so, then we have to always 'memset' in_addr to 0 before use.

If you're accessing in_addr.s_addr, why do you care if there is padding
before or after?

If you're trying to access in_addr as though it were not a struct I can
see why you would care, but that seems to be a pretty egregious error.

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon@panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"

Thread

struct with one member: padding? "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-06-27 12:33 -0400
  Re: struct with one member: padding? John Gordon <gordon@panix.com> - 2012-06-27 16:40 +0000
    Re: struct with one member: padding? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-06-27 18:27 +0100
  Re: struct with one member: padding? Ben Pfaff <blp@cs.stanford.edu> - 2012-06-27 09:57 -0700
  Re: struct with one member: padding? China Blue Meanies <chine.bleu@yahoo.com> - 2012-06-27 12:15 -0700
    Re: struct with one member: padding? Andrew Cooper <amc96@cam.ac.uk> - 2012-06-27 22:52 +0100
      Re: struct with one member: padding? scott@slp53.sl.home (Scott Lurndal) - 2012-06-27 23:42 +0000
  Re: struct with one member: padding? William Ahern <william@wilbur.25thandClement.com> - 2012-06-27 18:03 -0700

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