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Re: strtok() and the mistery of the same address strings with different lengths...

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On 01/14/2017 06:11 AM, Fernando D. Bozzo wrote:
> El sábado, 14 de enero de 2017, 4:00:52 (UTC+1), James Kuyper  escribió:
>> <snip>
>> As for why it works that way, I think it was just a bad decision, possibly influenced in part by a lack of experience with multi-threading.
> 
> 
> I think that when this function was created, the Multi-threading didn't exist.

Possibly - I don't know how long ago strtok was created. However, it
would have to predate C itself by a couple of years (which is entirely
possible - C was not invented out of whole cloth), in order to pre-date
threading. According to
<https://en.wikipedia.org/wiki/Thread_(computing)> 'Threads made an
early appearance in OS/360 Multiprogramming with a Variable Number of
Tasks (MVT) in 1967, in which context they were called "tasks".'

That's why I was cautious, and merely cited "lack of experience with
multi-threading" as a possible explanation, rather than "non-existence
of multi-threading".

Keep in mind that the same features that make strtok() problematic in
multi-threaded contexts also make it problematic in a far more ordinary
cases, one of which I actually ran into. The calling function was doing
a strtok() loop, and during each pass through the loop, it called a
subroutine. That subroutine was in a library I inherited responsibility
for, which also called strtok() for it's own purposes, rather thoroughly
messing up the calling routine.
I re-wrote the library function to do the same thing that strtok does,
but with explicit code rather than by calling strtok().

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strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-13 16:16 -0800
  Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-13 16:30 -0800
  Re: strtok() and the mistery of the same address strings with different lengths... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-14 00:44 +0000
    Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-13 17:43 -0800
    Re: strtok() and the mistery of the same address strings with different lengths... Manfred <noname@invalid.add> - 2017-01-14 16:52 +0100
      Re: strtok() and the mistery of the same address strings with different lengths... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-14 19:38 +0000
  Re: strtok() and the mistery of the same address strings with different lengths... Keith Thompson <kst-u@mib.org> - 2017-01-13 16:49 -0800
    Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-13 17:39 -0800
      Re: strtok() and the mistery of the same address strings with different lengths... James Kuyper <jameskuyper@verizon.net> - 2017-01-13 22:00 -0500
        Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-14 03:11 -0800
          Re: strtok() and the mistery of the same address strings with different lengths... James Kuyper <jameskuyper@verizon.net> - 2017-01-14 10:50 -0500
            Re: strtok() and the mistery of the same address strings with different lengths... Keith Thompson <kst-u@mib.org> - 2017-01-14 14:27 -0800
              Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-14 15:21 -0800
              Re: strtok() and the mistery of the same address strings with different lengths... Les Cargill <lcargill99@comcast.com> - 2017-01-15 11:48 -0600
                Re: strtok() and the mistery of the same address strings with different lengths... Keith Thompson <kst-u@mib.org> - 2017-01-15 15:24 -0800
                Re: strtok() and the mistery of the same address strings with different lengths... Les Cargill <lcargill99@comcast.com> - 2017-01-15 22:11 -0600
      Re: strtok() and the mistery of the same address strings with different lengths... Manfred <noname@invalid.add> - 2017-01-14 16:48 +0100
  Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-14 03:18 -0800
    Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-14 04:16 -0800
      Re: strtok() and the mistery of the same address strings with different lengths... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-14 15:14 +0000
        Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-14 09:58 -0800
          Re: strtok() and the mistery of the same address strings with different lengths... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-14 19:51 +0000
            Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-14 15:18 -0800
        Re: strtok() and the mistery of the same address strings with different lengths... Keith Thompson <kst-u@mib.org> - 2017-01-14 14:17 -0800
    Re: strtok() and the mistery of the same address strings with different lengths... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-14 15:09 +0000
      Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-14 11:09 -0800
        Re: strtok() and the mistery of the same address strings with different lengths... luser droog <luser.droog@gmail.com> - 2017-01-14 11:41 -0800
        Re: strtok() and the mistery of the same address strings with different lengths... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-14 20:04 +0000
        Re: strtok() and the mistery of the same address strings with different lengths... James Kuyper <jameskuyper@verizon.net> - 2017-01-14 15:09 -0500
          Re: strtok() and the mistery of the same address strings with different lengths... "Fernando D. Bozzo" <fdbozzo@gmail.com> - 2017-01-14 15:22 -0800
      Re: strtok() and the mistery of the same address strings with different lengths... Keith Thompson <kst-u@mib.org> - 2017-01-14 14:21 -0800

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