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Groups > comp.lang.c > #151283

Re: memcpy can't take null.

From richard@cogsci.ed.ac.uk (Richard Tobin)
Newsgroups comp.lang.c
Subject Re: memcpy can't take null.
Date 2020-04-09 23:41 +0000
Organization Language Technology Group, University of Edinburgh
Message-ID <r6obrl$2rpf$1@macpro.inf.ed.ac.uk> (permalink)
References <6c3de07e-15c8-4cc0-a805-636a5976d086@googlegroups.com> <87a73llnu4.fsf@nosuchdomain.example.com> <3abbeb80-4c62-410e-a133-82d03e72b113@googlegroups.com> <87tv1sjtet.fsf@nosuchdomain.example.com>

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In article <87tv1sjtet.fsf@nosuchdomain.example.com>,
Keith Thompson  <Keith.S.Thompson+u@gmail.com> wrote:

>Perhaps not directly.  The Apple man page for memcpy (at least the
>one I found in a quick Google search) says:
>
>    The memcpy() function copies n bytes from memory area s2 to memory
>    area s1.  If s1 and s2 overlap, behavior is undefined.  Applications
>    in which s1 and s2 might overlap should use memmove(3) instead.
>
>The phrase "memory area s2" seems a bit vague.

That text, and the term "memory area", appear to derive ultimately
from the description of memcpy() in the System V manual page
MEMORY(3C), which starts:

  These functions operate efficiently on memory areas (arrays of
  characters bounded by a count, not terminated by a null character).

-- Richard

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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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