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Re: how to do this?

From James Kuyper <jameskuyper@verizon.net>
Newsgroups comp.lang.c
Subject Re: how to do this?
Date 2015-11-14 19:21 -0500
Organization Self
Message-ID <5647D007.2010207@verizon.net> (permalink)
References <n2849g$a6p$1@dont-email.me> <dapqp9Fi0ttU9@mid.individual.net> <n28emj$nl3$1@dont-email.me> <n28fpg$rmm$1@dont-email.me> <daq0r5Fi0ttU10@mid.individual.net>

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On 11/14/2015 07:10 PM, Ian Collins wrote:
> bilsch01 wrote:
...
>>    Oh.  The vec1 , vec2 . . . aren't null terminated.  I don't see any
>> way to fix that.
> 
> Your code as written implied that they were null terminated by using 
> strxxx functions to compare and copy them.

True. However, he opened the file in text mode, which means that even if
null characters were written to that file, there's no guarantee that
they'll still be there when read back from the file. That's because of
7.21.2p2:

"Data read in from a text stream will necessarily compare equal to the
data that were earlier written out to that stream only if: the data
consist only of printing characters and the control characters
horizontal tab and new-line; no new-line character is immediately
preceded by space characters; and the last character is a new-line
character."

Therefore, if a file contains null characters, it should be read in
binary mode, not text mode.

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Thread

how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 12:09 -0800
  Re: how to do this? Rosario19 <Ros@invalid.invalid> - 2015-11-14 21:49 +0100
  Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 10:02 +1300
    Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 10:17 +1300
    Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:16 -0800
      Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 18:24 -0500
        Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:30 -0800
          Re: how to do this? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-11-14 19:01 -0500
          Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 19:07 -0500
  Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 11:26 +1300
    Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:07 -0800
      Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 18:17 -0500
      Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:25 -0800
        Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 13:10 +1300
          Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 19:21 -0500
            Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 13:24 +1300
        Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 19:12 -0500
          Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 13:18 +1300
            Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 19:23 -0500
  Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:18 -0800

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