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Groups > comp.lang.c > #101815
| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: strtok() and the mistery of the same address strings with different lengths... |
| Date | 2017-01-14 14:27 -0800 |
| Organization | None to speak of |
| Message-ID | <lnwpdxi8f3.fsf@kst-u.example.com> (permalink) |
| References | (1 earlier) <ln1sw6lb3d.fsf@kst-u.example.com> <77fd1c6c-16e6-418f-859e-a56547a59389@googlegroups.com> <o5c45t$92p$1@dont-email.me> <fa890013-bd75-4bf3-906d-e32f034e6065@googlegroups.com> <o5dh8c$4mk$1@dont-email.me> |
James Kuyper <jameskuyper@verizon.net> writes:
[...]
> 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().
Perhaps a more straightforward example: Suppose you want to parse
a string with strtok(), where each substring needs to be parsed
with strtok(). For example, you might have several space-delimited
fields, where each field contains several comma-delimited subfields.
You can't use strtok() while another sequence of strtok() calls
is pending. It saves a static pointer into the string passed on the
first call -- and that pointer is shared by *all* calls to strtok(),
not just calls in a particular parsed string.
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
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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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