Re: Query abt union

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Date	Sat, 25 Jun 2011 15:30:32 -0400
From	pete <pfiland@mindspring.com>
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Subject	Re: Query abt union
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pete wrote:
> 
> pozz wrote:
> 
> > So I think strncpy() is good to avoid this bad situations:
> >
> >    char mystring[10];
> >    void mystrcpy(const char *arg) {
> >      strncpy(mystring, arg, sizeof(mystring) - 1);
> >      mystring[sizeof(mystring) - 1] = '\0';
> >    }
> >
> > What is wrong with this?
> 
> Why wouldn't you use memcpy instead of strncpy
> in the above code?
> 
> memcpy is the simpler of the two functions.
> 
> The extra features which distiguish strncpy from memcpy
> are only useful in the above code
> if you really want mystring
> to be padded out to the end with null bytes.

I take that back.
It would be more complicated with memcpy.
You would have to provide code to prevent memcpy
from reading beyond a short string.

-- 
pete

Thread

Query abt union "sumit.sharma" <nospam@nospam.com> - 2011-06-23 20:07 +0000
  Re: Query abt union Ben Pfaff <blp@cs.stanford.edu> - 2011-06-23 13:18 -0700
  Re: Query abt union Shao Miller <sha0.miller@gmail.com> - 2011-06-23 17:20 -0500
    Re: Query abt union James Waldby <not@valid.invalid> - 2011-06-24 17:34 +0000
      Re: Query abt union Shao Miller <sha0.miller@gmail.com> - 2011-06-24 14:42 -0400
        Re: Query abt union James Waldby <not@valid.invalid> - 2011-06-24 21:13 +0000
          Re: Query abt union Shao Miller <sha0.miller@gmail.com> - 2011-06-26 14:08 -0500
            Re: Query abt union James Waldby <not@valid.invalid> - 2011-06-27 05:13 +0000
  Re: Query abt union John Gordon <gordon@panix.com> - 2011-06-23 22:27 +0000
  Re: Query abt union Lew Pitcher <lpitcher@teksavvy.com> - 2011-06-23 18:47 -0400
    Re: Query abt union Shao Miller <sha0.miller@gmail.com> - 2011-06-23 17:54 -0500
      Re: Query abt union Keith Thompson <kst-u@mib.org> - 2011-06-23 17:19 -0700
        Re: Query abt union Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-23 22:12 -0600
          Re: Query abt union Keith Thompson <kst-u@mib.org> - 2011-06-23 22:32 -0700
            Re: Query abt union Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-24 08:51 -0600
              Re: Query abt union Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-06-24 16:30 +0100
          Re: Query abt union pete <pfiland@mindspring.com> - 2011-06-24 12:46 -0400
            Re: Query abt union Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-24 16:18 -0600
        Re: Query abt union pozz <pozzugno@gmail.com> - 2011-06-24 23:14 +0200
          Re: Query abt union John Gordon <gordon@panix.com> - 2011-06-24 21:37 +0000
            Re: Query abt union Shao Miller <sha0.miller@gmail.com> - 2011-06-26 14:28 -0500
          Re: Query abt union Keith Thompson <kst-u@mib.org> - 2011-06-24 14:56 -0700
            Re: Query abt union Edward Rutherford <edward.p.rutherford79@REMOVETHIS.gmail.com> - 2011-06-24 22:10 +0000
              Re: Query abt union Keith Thompson <kst-u@mib.org> - 2011-06-24 15:41 -0700
          Re: Query abt union pete <pfiland@mindspring.com> - 2011-06-25 10:33 -0400
            Re: Query abt union pete <pfiland@mindspring.com> - 2011-06-25 15:30 -0400
          Re: Query abt union Shao Miller <sha0.miller@gmail.com> - 2011-06-26 14:12 -0500
    Re: Query abt union Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-23 17:13 -0600

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