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Groups > comp.lang.c > #12972

Re: Character Array vs String

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On 11/09/2011 11:24 AM, Willem wrote:
> James Kuyper wrote:
> ) On 11/09/2011 10:48 AM, Malcolm McLean wrote:
> ) ...
> )> For instance IFF files have 4-letter ASCII tags which indicate what
> )> sort of "chunk" you are reading. So the obvious thing to write is
> )> 
> )> fread(chunk, 1, 4, fp);
> )> if(!strncmp(chunk, "DATA", 4))
> )>   /* we've got a data chunk */
> )> 
> )> That will break on a non-ascii system. The solution is to hardcode the
> )> values. But then you can no longer read the word "DATA" and it becomes
> )> a lot harder to see that the chunk identifier is correct.
> )
> ) You can make it a macro, whose name is more informative than the
> ) hardcoded values. However, the better solution (though not always
> ) feasible) is to convert those files from ASCII to the native encoding on
> ) that platform,
> 
> They are not ASCII files.  They are binary files with chunks that are
> identified by a 4-byte header which has meaning when read as ASCII.

That makes it harder; the conversion utility would have to know about
the file format. It's still not impossible, but obviously far less
convenient.

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Character Array vs String Sheky <shekhar07.nitdgp@gmail.com> - 2011-11-09 03:09 -0800
  Re: Character Array vs String Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-11-09 03:28 -0800
  Re: Character Array vs String James Kuyper <jameskuyper@verizon.net> - 2011-11-09 06:52 -0500
  Re: Character Array vs String Quentin Carbonneaux <qcarbonn@invalid.com> - 2011-11-09 12:01 +0000
    Re: Character Array vs String 88888 Dihedral <dihedral88888@googlemail.com> - 2011-11-09 04:48 -0800
      Re: Character Array vs String Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-09 05:53 -0800
        Re: Character Array vs String "osmium" <r124c4u102@comcast.net> - 2011-11-09 09:44 -0600
          Re: Character Array vs String Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-10 00:57 -0800
            Re: Character Array vs String "osmium" <r124c4u102@comcast.net> - 2011-11-10 08:56 -0600
              Re: Character Array vs String Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-10 08:16 -0800
                Re: Character Array vs String "Joachim Schmitz" <nospam.jojo@schmitz-digital.de> - 2011-11-10 18:34 +0100
                Re: Character Array vs String Kenneth Brody <kenbrody@spamcop.net> - 2011-11-10 14:08 -0500
                Re: Character Array vs String Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-11-10 20:52 +0000
                Re: Character Array vs String Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-11 01:29 -0800
              Re: Character Array vs String Lowell Gilbert <lgusenet@be-well.ilk.org> - 2011-11-10 12:29 -0500
              Re: Character Array vs String lawrence.jones@siemens.com - 2011-11-10 12:32 -0500
                Re: Character Array vs String Keith Thompson <kst-u@mib.org> - 2011-11-10 12:41 -0800
                Re: Character Array vs String jt@toerring.de (Jens Thoms Toerring) - 2011-11-11 13:12 +0000
              Re: Character Array vs String David Thompson <dave.thompson2@verizon.net> - 2011-11-21 02:39 -0500
                Re: Character Array vs String Kenneth Brody <kenbrody@spamcop.net> - 2011-11-23 11:39 -0500
                Re: Character Array vs String "BartC" <bc@freeuk.com> - 2011-11-23 17:15 +0000
                Re: Character Array vs String Kaz Kylheku <kaz@kylheku.com> - 2011-11-23 18:48 +0000
                Re: Character Array vs String Ben Pfaff <blp@cs.stanford.edu> - 2011-11-23 10:58 -0800
                Re: Character Array vs String Patrick Scheible <kkt@zipcon.net> - 2011-11-27 20:21 -0800
                Re: Character Array vs String David Thompson <dave.thompson2@verizon.net> - 2012-01-19 02:43 -0500
        Re: Character Array vs String Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-11-09 07:48 -0800
          Re: Character Array vs String James Kuyper <jameskuyper@verizon.net> - 2011-11-09 11:06 -0500
            Re: Character Array vs String Willem <willem@toad.stack.nl> - 2011-11-09 16:24 +0000
              Re: Character Array vs String James Kuyper <jameskuyper@verizon.net> - 2011-11-09 11:30 -0500
                Re: Character Array vs String "BartC" <bc@freeuk.com> - 2011-11-09 16:53 +0000
                Re: Character Array vs String Willem <willem@toad.stack.nl> - 2011-11-09 17:05 +0000
                Re: Character Array vs String Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-11-09 08:54 -0800
                Re: Character Array vs String Tobias Blass <tobiasblass@gmx.net> - 2011-11-09 21:01 +0000
                Re: Character Array vs String "BartC" <bc@freeuk.com> - 2011-11-09 21:26 +0000
                Re: Character Array vs String Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-10 01:11 -0800
                Re: Character Array vs String David Thompson <dave.thompson2@verizon.net> - 2011-11-21 02:39 -0500
                Re: Character Array vs String Keith Thompson <kst-u@mib.org> - 2011-11-21 00:15 -0800
                Re: Character Array vs String Keith Thompson <kst-u@mib.org> - 2011-11-09 14:06 -0800
                Re: Character Array vs String Stephen Sprunk <stephen@sprunk.org> - 2011-11-09 19:32 -0600
                Re: Character Array vs String Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-11-10 03:21 +0000
                Re: Character Array vs String "BartC" <bc@freeuk.com> - 2011-11-10 11:00 +0000
                Re: Character Array vs String Keith Thompson <kst-u@mib.org> - 2011-11-10 03:26 -0800
                Re: Character Array vs String Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-11-10 12:04 +0000
                Re: Character Array vs String Lew Pitcher <lpitcher@teksavvy.com> - 2011-11-21 12:02 -0800
                Re: Character Array vs String Kenneth Brody <kenbrody@spamcop.net> - 2011-11-23 11:42 -0500
                Re: Character Array vs String Uno <merrilljensen@q.com> - 2011-11-27 22:46 -0700
                Re: Character Array vs String Lew Pitcher <lpitcher@teksavvy.com> - 2011-11-27 23:30 -0800
                Re: Character Array vs String Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-28 00:22 -0800
        Re: Character Array vs String Keith Thompson <kst-u@mib.org> - 2011-11-09 13:59 -0800
    Re: Character Array vs String James Kuyper <jameskuyper@verizon.net> - 2011-11-09 08:36 -0500
      Re: Character Array vs String Quentin Carbonneaux <qcarbonn@invalid.com> - 2011-11-09 14:06 +0000
    Re: Character Array vs String Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-11-09 05:38 -0800
    Re: Character Array vs String Keith Thompson <kst-u@mib.org> - 2011-11-09 13:52 -0800
  Re: Character Array vs String Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-09 07:39 -0500
  Re: Character Array vs String "BartC" <bc@freeuk.com> - 2011-11-09 13:51 +0000
  Re: Character Array vs String John Bode <jfbode1029@gmail.com> - 2011-11-23 19:32 -0800
    Re: Character Array vs String James Kuyper <jameskuyper@verizon.net> - 2011-11-24 11:49 -0500

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