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Re: strncpy and 'n'

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Shao Miller wrote:
> 
> On 2/20/2012 23:16, pete wrote:
> > Shao Miller wrote:
> >
> >> My impression is that in:
> >>
> >>     char foo[] = "foo";
> >>     char bar[3] = "bar";
> >>     char baz[10] = "baz";
> >>
> >> each of these could be roughly equivalent to:
> >>
> >>     char foo[sizeof "foo"];
> >>     char bar[3];
> >>     char baz[10];
> >>
> >>     strncat(foo, "foo", sizeof "foo");
> >>     strncat(bar, "bar", 3);
 
> Somehow, I completely was confusing 'strncpy' with 'strncat', here. :(
> Please substitute 'strncpy' in place of 'strncat' in my post. :(  Of
> course, that makes it irrelevant
> to Keith's immediately-preceding post.
> 
> Thank you for the correction, pete!

You're welcome.

What I don't about the idea of using strncpy instead of strcpy,
is that learning to use strncpy instead of strcpy,
seems to me to be more complicated 
than learning to use strcpy properly.

The n parameter of strncpy makes it harder to forget
that the size of something must be taken into account.

But anyone who would have trouble remembering
how to use strcpy correctly, 
might also have trouble remembering 
that if n is less than (1 + source string length) 
then the resulting strncpy write, will not be a string.

I've always been comfortable using strcpy.

-- 
pete

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Thread

strncpy and 'n' nroberts <roberts.noah@gmail.com> - 2012-02-16 09:05 -0800
  Re: strncpy and 'n' Anders Wegge Keller <wegge@wegge.dk> - 2012-02-16 18:57 +0100
    Re: strncpy and 'n' "A. K." <akk@nospam.org> - 2012-02-16 19:27 +0100
      Re: strncpy and 'n' Anders Wegge Keller <wegge@wegge.dk> - 2012-02-16 19:34 +0100
        Re: strncpy and 'n' "A. K." <akk@nospam.org> - 2012-02-16 20:58 +0100
  Re: strncpy and 'n' Keith Thompson <kst-u@mib.org> - 2012-02-16 10:01 -0800
    Re: strncpy and 'n' Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-16 11:10 -0800
      Re: strncpy and 'n' Keith Thompson <kst-u@mib.org> - 2012-02-16 14:20 -0800
        Re: strncpy and 'n' Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-17 04:19 -0800
          Re: strncpy and 'n' James Kuyper <jameskuyper@verizon.net> - 2012-02-17 10:04 -0500
            Re: strncpy and 'n' Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-17 10:27 -0800
            Re: strncpy and 'n' Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-17 11:22 -0800
              Re: strncpy and 'n' James Kuyper <jameskuyper@verizon.net> - 2012-02-17 14:40 -0500
                Re: strncpy and 'n' Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-18 02:17 -0800
    Re: strncpy and 'n' jgk@panix.com (Joe keane) - 2012-02-19 20:04 +0000
      Re: strncpy and 'n' Keith Thompson <kst-u@mib.org> - 2012-02-19 12:33 -0800
        Re: strncpy and 'n' jgk@panix.com (Joe keane) - 2012-02-20 21:25 +0000
          Re: strncpy and 'n' Keith Thompson <kst-u@mib.org> - 2012-02-20 14:46 -0800
            Re: strncpy and 'n' Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-02-23 23:13 +0000
              Re: strncpy and 'n' Keith Thompson <kst-u@mib.org> - 2012-02-23 16:20 -0800
              Re: strncpy and 'n' Philip Lantz <prl@canterey.us> - 2012-02-25 00:26 -0800
              Re: strncpy and 'n' pacman@kosh.dhis.org (Alan Curry) - 2012-02-26 01:34 +0000
                Re: strncpy and 'n' Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-02-28 22:46 +0000
                Re: strncpy and 'n' jgk@panix.com (Joe keane) - 2012-03-01 00:03 +0000
                Re: strncpy and 'n' Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-03-01 12:03 +0000
          Re: strncpy and 'n' James Kuyper <jameskuyper@verizon.net> - 2012-02-20 17:51 -0500
        Re: strncpy and 'n' Shao Miller <sha0.miller@gmail.com> - 2012-02-20 18:14 -0500
          Re: strncpy and 'n' pete <pfiland@mindspring.com> - 2012-02-20 23:16 -0500
            Re: strncpy and 'n' Shao Miller <sha0.miller@gmail.com> - 2012-02-25 01:51 -0500
              Re: strncpy and 'n' pete <pfiland@mindspring.com> - 2012-02-25 10:34 -0500
        Re: strncpy and 'n' Rich Webb <bbew.ar@mapson.nozirev.ten> - 2012-02-20 19:09 -0500
          Re: strncpy and 'n' Keith Thompson <kst-u@mib.org> - 2012-02-20 16:46 -0800
            Re: strncpy and 'n' Rich Webb <bbew.ar@mapson.nozirev.ten> - 2012-02-20 20:48 -0500
          Re: strncpy and 'n' Shao Miller <sha0.miller@gmail.com> - 2012-02-20 19:46 -0500
        Re: strncpy and 'n' jgk@panix.com (Joe keane) - 2012-02-21 21:46 +0000
          Re: strncpy and 'n' James Kuyper <jameskuyper@verizon.net> - 2012-02-21 17:15 -0500
          Re: strncpy and 'n' Keith Thompson <kst-u@mib.org> - 2012-02-21 14:29 -0800
            Re: strncpy and 'n' Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-22 01:15 -0800
            Re: strncpy and 'n' jgk@panix.com (Joe keane) - 2012-02-23 00:02 +0000
              Re: strncpy and 'n' Keith Thompson <kst-u@mib.org> - 2012-02-22 17:02 -0800
  Re: strncpy and 'n' Markus Schaub <usenet@markus-schaub.de> - 2012-02-16 18:53 +0000
  Re: strncpy and 'n' lawrence.jones@siemens.com - 2012-02-16 13:25 -0500
  Re: strncpy and 'n' blp@cs.stanford.edu (Ben Pfaff) - 2012-02-16 11:18 -0800
  Re: strncpy and 'n' Stephen Sprunk <stephen@sprunk.org> - 2012-02-16 13:29 -0600
    Re: strncpy and 'n' Ike Naar <ike@iceland.freeshell.org> - 2012-02-16 22:45 +0000
  Re: strncpy and 'n' ImpalerCore <jadill33@gmail.com> - 2012-02-16 11:32 -0800
  Re: strncpy and 'n' Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-02-17 00:50 -0800

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