Re: getline() problem

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From	Ben <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c++
Subject	Re: getline() problem
Date	Mon, 25 Apr 2022 11:07:13 +0100
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Malcolm McLean <malcolm.arthur.mclean@gmail.com> writes:

> On Sunday, 24 April 2022 at 03:17:12 UTC+1, Ben wrote:
>> Keith Thompson <Keith.S.T...@gmail.com> writes: 
>> 
>> > Ben <ben.u...@bsb.me.uk> writes: 
>> >> Malcolm McLean <malcolm.ar...@gmail.com> writes: 
>> >> 
>> >>> Nul bytes will break most text-based reading functions, because they return 
>> >>> text as C strings, and C strings are Nul-terminated. However std::strings can 
>> >>> have embedded nuls without special processing. You just have to be careful 
>> >>> not to pass them to any function that coverts them to C strings. In practice 
>> >>> that probably means taking action against the nuls at an early stage. 
>> >> 
>> >> This is comp.lang.c++ not comp.lang.c! 
>> > 
>> > Yes, of course.
>>
>> Sure, but the question was about getline.
>>
> Most medium-sized to large C++ programs contain routines which accept or,
> more rarely, return C strings. We use a API which was first developed before
> std::string was invented. It has grown since then. It has it's own Unicode
> String() class, then there's an entirely separate Unicode character type
> which is used for communicating with the GUI. There's not actually much
> use of std::strings in the API, though we use them quite a bit in our own
> code.

I think we are talking at cross purposes.  std::getline has no trouble
with nulls (though I think it may be permitted to, if you see what I
mean).  In general, C++ std::string avoids a lot of the trouble the C
has with its raw strings.

> So strings are a bit of a mess. As is typical. Embedded nuls in std::strings
> are definitely an accident waiting to happen in our code

They are likely be a problem in lots of code bases, but that's not
related to the point that came up.

-- 
Ben.

Thread

getline() problem Jivanmukta <jivanmukta@poczta.onet.pl> - 2022-04-23 19:07 +0200
  Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-23 10:17 -0700
    Re: getline() problem Jivanmukta <jivanmukta@poczta.onet.pl> - 2022-04-23 19:40 +0200
      Re: getline() problem Jivanmukta <jivanmukta@poczta.onet.pl> - 2022-04-23 19:59 +0200
        Re: getline() problem Paavo Helde <eesnimi@osa.pri.ee> - 2022-04-23 21:47 +0300
          Re: getline() problem Juha Nieminen <nospam@thanks.invalid> - 2022-04-25 06:00 +0000
            Re: getline() problem Öö Tiib <ootiib@hot.ee> - 2022-04-25 00:12 -0700
            Re: getline() problem Paavo Helde <eesnimi@osa.pri.ee> - 2022-04-25 11:40 +0300
            Re: getline() problem James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-04-25 11:37 -0400
              Re: getline() problem Vir Campestris <vir.campestris@invalid.invalid> - 2022-04-25 16:54 +0100
                Re: getline() problem James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-04-25 12:29 -0400
                Re: getline() problem scott@slp53.sl.home (Scott Lurndal) - 2022-04-25 17:29 +0000
                Re: getline() problem Manfred <noname@add.invalid> - 2022-04-25 20:17 +0200
                Re: getline() problem Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-04-25 10:19 -0700
                Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-25 10:41 -0700
                Re: getline() problem Paavo Helde <eesnimi@osa.pri.ee> - 2022-04-25 21:58 +0300
              Re: getline() problem scott@slp53.sl.home (Scott Lurndal) - 2022-04-25 15:56 +0000
                Re: getline() problem James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-04-25 13:12 -0400
                Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-25 11:03 -0700
                Re: getline() problem scott@slp53.sl.home (Scott Lurndal) - 2022-04-25 19:05 +0000
                Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-25 12:48 -0700
                Re: getline() problem Ben <ben.usenet@bsb.me.uk> - 2022-04-25 21:46 +0100
                Re: getline() problem Juha Nieminen <nospam@thanks.invalid> - 2022-04-26 05:43 +0000
                Re: getline() problem David Brown <david.brown@hesbynett.no> - 2022-04-26 09:36 +0200
                Re: getline() problem Juha Nieminen <nospam@thanks.invalid> - 2022-04-26 09:18 +0000
                Re: getline() problem Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-04-26 02:47 -0700
                Re: getline() problem Juha Nieminen <nospam@thanks.invalid> - 2022-04-26 11:06 +0000
                Re: getline() problem David Brown <david.brown@hesbynett.no> - 2022-04-26 15:52 +0200
                Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-26 07:04 -0700
                Re: getline() problem Manfred <noname@add.invalid> - 2022-04-26 16:49 +0200
                Re: getline() problem James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-04-26 12:01 -0400
                Re: getline() problem James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-04-26 11:49 -0400
                Re: getline() problem Manfred <noname@add.invalid> - 2022-04-25 20:23 +0200
            Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-25 10:33 -0700
              Re: getline() problem "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2022-04-25 10:52 -0700
                Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-25 11:08 -0700
                Re: getline() problem "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2022-04-25 21:18 -0700
                Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-25 22:04 -0700
              Re: getline() problem Paavo Helde <eesnimi@osa.pri.ee> - 2022-04-25 22:06 +0300
                Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-25 13:02 -0700
        Re: getline() problem Barry Schwarz <schwarzb@delq.com> - 2022-04-23 12:54 -0700
        Re: getline() problem Montmorency <none@none.com> - 2022-04-23 14:45 -0700
          Re: getline() problem Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-04-23 16:49 -0700
            Re: getline() problem Ben <ben.usenet@bsb.me.uk> - 2022-04-24 01:04 +0100
              Re: getline() problem Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-04-23 18:24 -0700
                Re: getline() problem Ben <ben.usenet@bsb.me.uk> - 2022-04-24 03:16 +0100
                Re: getline() problem Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-04-24 22:51 -0700
                Re: getline() problem Ben <ben.usenet@bsb.me.uk> - 2022-04-25 11:07 +0100
            Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-23 17:15 -0700
              Re: getline() problem Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-04-23 18:23 -0700
          Re: getline() problem Jivanmukta <jivanmukta@poczta.onet.pl> - 2022-04-24 05:28 +0200
  Re: getline() problem Jivanmukta <jivanmukta@poczta.onet.pl> - 2022-04-25 12:41 +0200
    Re: getline() problem Paavo Helde <eesnimi@osa.pri.ee> - 2022-04-25 14:33 +0300
    Re: getline() problem Jivanmukta <jivanmukta@poczta.onet.pl> - 2022-04-25 18:53 +0200
      Re: getline() problem Paavo Helde <eesnimi@osa.pri.ee> - 2022-04-25 22:08 +0300
        Re: getline() problem Jivanmukta <jivanmukta@poczta.onet.pl> - 2022-04-26 09:01 +0200
          Re: getline() problem Paavo Helde <eesnimi@osa.pri.ee> - 2022-04-26 11:15 +0300

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