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Groups > comp.lang.c > #151107
| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: memcpy can't take null. |
| Date | 2020-04-06 01:20 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <871rp1cvmd.fsf@bsb.me.uk> (permalink) |
| References | <6c3de07e-15c8-4cc0-a805-636a5976d086@googlegroups.com> |
Malcolm McLean <malcolm.arthur.mclean@gmail.com> writes:
> memcpy() cannot take null as a pointer parametrer, even if the size argument
> is zero.
>
> So what are the implications for passing empty buffers about? For example,
> how would people write
>
> /* struct employee has no embedded pointers */
>
> Employee *duplicateEmployees(Employee *employees, int Nemployees)
Employee *duplicateEmployees(Employee *employees, int Nemployees)
{
Employee *copy = 0;
if (Nemployees > 0 && (copy = malloc(Nemployees * sizeof *copy)))
memcpy(copy, employees, Nemployees * sizeof *copy);
return copy;
}
though I'd rather it were
Employee *duplicateEmployees(const Employee *employees, size_t Nemployees);
--
Ben.
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memcpy can't take null. Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-04-05 06:47 -0700
Re: memcpy can't take null. Öö Tiib <ootiib@hot.ee> - 2020-04-05 07:30 -0700
Re: memcpy can't take null. Richard Damon <Richard@Damon-Family.org> - 2020-04-05 14:39 -0400
Re: memcpy can't take null. Philipp Klaus Krause <pkk@spth.de> - 2020-04-06 18:46 +0200
Re: memcpy can't take null. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-06 12:45 -0700
Re: memcpy can't take null. Philipp Klaus Krause <pkk@spth.de> - 2020-04-07 07:28 +0200
Re: memcpy can't take null. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-05 16:00 -0700
Re: memcpy can't take null. Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-04-05 18:29 -0600
Re: memcpy can't take null. scott@slp53.sl.home (Scott Lurndal) - 2020-04-06 18:08 +0000
Re: memcpy can't take null. Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-04-06 15:44 -0600
Re: memcpy can't take null. Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-04-06 13:54 -0700
Re: memcpy can't take null. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-06 14:30 -0700
Re: memcpy can't take null. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-04-06 01:20 +0100
Re: memcpy can't take null. Siri Cruise <chine.bleu@yahoo.com> - 2020-04-05 19:09 -0700
Re: memcpy can't take null. Guillaume <message@bottle.org> - 2020-04-07 16:50 +0200
Re: memcpy can't take null. Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-04-07 09:19 -0700
Re: memcpy can't take null. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-07 09:21 -0700
Re: memcpy can't take null. Guillaume <message@bottle.org> - 2020-04-08 01:41 +0200
Re: memcpy can't take null. scott@slp53.sl.home (Scott Lurndal) - 2020-04-08 00:30 +0000
Re: memcpy can't take null. Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-04-08 02:06 -0700
Re: memcpy can't take null. Richard Damon <Richard@Damon-Family.org> - 2020-04-08 09:17 -0400
Re: memcpy can't take null. Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-04-09 07:16 -0700
Re: memcpy can't take null. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-08 13:33 -0700
Re: memcpy can't take null. Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-04-09 09:05 -0700
Re: memcpy can't take null. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-09 13:28 -0700
Re: memcpy can't take null. richard@cogsci.ed.ac.uk (Richard Tobin) - 2020-04-09 23:41 +0000
Re: memcpy can't take null. Guillaume <message@bottle.org> - 2020-04-08 16:17 +0200
Re: memcpy can't take null. Ike Naar <ike@sdf.lonestar.org> - 2020-04-07 22:01 +0000
Re: memcpy can't take null. Guillaume <message@bottle.org> - 2020-04-08 01:32 +0200
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