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Groups > comp.lang.c > #149158
| From | T <T@invalid.invalid> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: C String terminator |
| Date | 2020-01-15 12:03 -0800 |
| Organization | A noiseless patient Spider |
| Message-ID | <qvnr62$5ln$1@dont-email.me> (permalink) |
| References | <qvktc8$gvf$1@dont-email.me> <87v9pdhwet.fsf@nosuchdomain.example.com> <qvnl2n$tu6$3@dont-email.me> <87eew0ikfe.fsf@nosuchdomain.example.com> |
On 2020-01-15 11:33, Keith Thompson wrote:
> T <T@invalid.invalid> writes:
>> On 2020-01-15 02:00, Keith Thompson wrote:
>> I accidentally hit the wrong button and
>> lost your last letter.
>>
>> I now have everything I need. Do you still
>> want the link to the discussion?
>
> Yes. (Wouldn't it have been easier to post the link, or even email
> it to me, rather than asking whether I still want it?)
>
Actually, no. I had to do a bunch of detective work.
This subject appears in two threads:
NativeCall Doc booboo
https://www.nntp.perl.org/group/perl.perl6.users/2019/12/msg7586.html
My favorite response was:
It will not be corrected because it's not a
documentation error. Also, using strings in the way
your other (native) libraries need is just common
sense, that goes without saying, or "is left as
an exercise to the student". In general, you don't
need to null-terminate strings, and that's what
the example goes. Any wrapper to a native library
which _does_ need that should specifically say so.
Got to love "is left as an exercise to the student"
Bug to report: cardinal called an integer
The discussion is mainly a bunch of arguing about what
constitutes a cardinal and what constitutes an integer.
The C String starts again over at:
https://www.nntp.perl.org/group/perl.perl6.users/2020/01/msg7728.html
This was my response:
On 2020-01-14 01:13, JJ Merelo wrote:
> Never miss a good chance to bash documentation...
Guilty as charged?
> By the way, "C String" REQUIRES a nul at the end:
> an error in the NativeCall documentation.
> No, it does not. And even if it did, it should better go to the C,
not Raku, documentation
Oh Great And Mighty Gatekeeper of the Documentation!
You are in error. The problem is the mistake in the
documentation you won't fix and your misunderstand of
the C programming language.
INTERNATIONAL STANDARD ©ISO/IEC ISO/IEC 9899:201x
Programming languages — C
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf
5.2.1 Character sets
:
2 In a character constant or string literal, members
of the execution character set shall be
represented
by corresponding members of the source character
set or by escape
sequences consisting of the
backslash \ followed by one or more characters.
A byte with
all bits set to 0, called the null
character, shall exist in the basic execution
character set; *it
is used to terminate a character
string*.
7.1.1 Definitions of terms
1 A string is a contiguous sequence of characters
*terminated by and including the first null
character*. The term multibyte string is
sometimes used instead to emphasize special
processing given to multibyte characters contained
in the string or to avoid confusion
with a wide
string. A pointer to a string is a pointer to
its initial (lowest addressed)
character. The
length of a string is the number of bytes
preceding the null character and
the value of a
string is the sequence of the values of the
contained characters, in order.
You are basically confusing a "String" with a "String literal".
They are two different things. A String Literal can have
nuls in them that are part of the string literal. And
with a string literal, you have to also keep track of the
length of the string literal.
In WinAPI, calls
https://docs.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regsetvalueexw
a "string literal" is annotated as:
const BYTE *lpData
And the byte count of such is
DWORD cbData
Note that "*lpData" can be a little endian four byte
DWORD cardial or a UTF16 array of WORDS.
A "C" string (not a string literal) would be
https://docs.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regqueryvalueexw
LPCWSTR lpValueName
Are you able to see the difference between "const BYTE *lpData
plus DWORD cbData" and "LPCWSTR lpValueName"? One is
a "String Literal" and the other one is "String".
"LPCWSTR lpValueName" does not need to know the length of the string
because it expects to see a nul at the end.
Your holding on to NOT-A-BUG will mean that everyone
using the documentation will have to figure this all
out the hard way, as I did.
Oh great and exalted Gatekeeper, today you get a C-.
Minus for meanness.
Your favorite Golden Retriever,
-T
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
C String terminator T <T@invalid.invalid> - 2020-01-14 09:22 -0800
Re: C String terminator Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-01-14 09:32 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-14 09:43 -0800
Re: C String terminator Bart <bc@freeuk.com> - 2020-01-14 17:53 +0000
Re: C String terminator David Brown <david.brown@hesbynett.no> - 2020-01-14 20:17 +0100
Re: C String terminator Bart <bc@freeuk.com> - 2020-01-14 20:01 +0000
Re: C String terminator Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-01-14 09:57 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-14 11:37 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 09:02 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 09:38 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 09:53 -0800
Re: C String terminator Manfred <noname@add.invalid> - 2020-01-14 20:48 +0100
Re: C String terminator chad <cdalten@gmail.com> - 2020-01-15 05:43 -0800
Re: C String terminator Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-01-15 07:12 -0800
Re: C String terminator Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-01-15 15:35 +0000
Re: C String terminator chad <cdalten@gmail.com> - 2020-01-19 06:20 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-15 10:52 -0800
Re: C String terminator Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-01-15 12:52 -0800
Re: C String terminator gazelle@shell.xmission.com (Kenny McCormack) - 2020-01-15 20:56 +0000
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 02:17 +0000
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-15 21:54 -0800
Re: C String terminator fir <profesor.fir@gmail.com> - 2020-01-16 02:07 -0800
Re: C String terminator Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-01-16 02:45 -0800
Re: C String terminator Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-01-16 08:21 -0700
Re: C String terminator Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-01-16 08:03 -0800
Re: C String terminator John Bode <jfbode1029@gmail.com> - 2020-01-16 09:06 -0800
Re: C String terminator James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-16 11:29 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 02:01 +0000
Re: C String terminator James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-15 23:02 -0500
Re: C String terminator David Brown <david.brown@hesbynett.no> - 2020-01-16 11:15 +0100
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 13:07 +0000
Re: C String terminator Manfred <noname@add.invalid> - 2020-01-17 18:43 +0100
Re: C String terminator Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-01-21 04:00 -0800
Re: C String terminator James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-21 05:00 -0800
Re: C String terminator Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-01-14 12:36 -0700
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-14 12:05 -0800
Re: C String terminator Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-01-14 13:54 -0700
Re: C String terminator James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-14 15:03 -0800
Re: C String terminator Thiago Adams <thiago.adams@gmail.com> - 2020-01-15 04:55 -0800
Re: C String terminator Guillaume <message@bottle.org> - 2020-01-15 20:49 +0100
Re: C String terminator Thiago Adams <thiago.adams@gmail.com> - 2020-01-15 12:55 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-14 21:31 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 09:28 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 09:38 -0800
Re: C String terminator Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-01-15 10:50 -0700
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 10:17 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 09:53 -0800
Re: C String terminator Richard Damon <Richard@Damon-Family.org> - 2020-01-14 21:43 -0500
Re: C String terminator "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-01-14 22:52 -0800
Re: C String terminator "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-01-14 22:54 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-15 02:00 -0800
Re: C String terminator gazelle@shell.xmission.com (Kenny McCormack) - 2020-01-15 10:47 +0000
Re: C String terminator Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-01-15 03:02 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 10:19 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-15 11:33 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 12:03 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 01:30 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 18:17 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 03:44 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 20:33 -0800
Re: C String terminator fir <profesor.fir@gmail.com> - 2020-01-16 02:26 -0800
Re: C String terminator Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-01-15 15:11 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 09:32 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-15 10:47 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 10:58 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 01:39 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 18:27 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 19:03 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 03:28 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 19:33 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 19:38 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 13:31 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-16 09:09 -0800
Re: C String terminator Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-01-16 10:27 -0700
Re: C String terminator T <T@invalid.invalid> - 2020-01-16 10:54 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 20:59 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-16 14:11 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 20:17 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-16 14:14 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 23:45 +0000
Yes, Ben makes house calls (Was: C String terminator) gazelle@shell.xmission.com (Kenny McCormack) - 2020-01-16 23:57 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-17 11:28 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-17 20:46 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-17 12:48 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-17 12:54 -0800
Re: C String terminator Bart <bc@freeuk.com> - 2020-01-17 21:02 +0000
Re: C String terminator Bart <bc@freeuk.com> - 2020-01-17 21:21 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-17 13:35 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-17 13:44 -0800
Re: C String terminator fir <profesor.fir@gmail.com> - 2020-01-17 15:03 -0800
Re: C String terminator fir <profesor.fir@gmail.com> - 2020-01-17 15:06 -0800
Re: C String terminator Ike Naar <ike@sdf.lonestar.org> - 2020-01-18 07:30 +0000
Re: C String terminator Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-01-17 16:06 -0500
Re: C String terminator Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-01-17 16:23 -0500
Re: C String terminator T <T@invalid.invalid> - 2020-01-17 13:37 -0800
Re: C String terminator Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-01-21 04:10 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-21 10:41 -0800
Re: C String terminator Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-01-17 01:55 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-17 09:52 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-17 11:29 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 18:21 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-16 10:50 -0800
Re: C String terminator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-16 20:50 +0000
Re: C String terminator T <T@invalid.invalid> - 2020-01-16 14:17 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-15 09:59 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-15 10:15 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-18 21:42 -0800
Re: C String terminator T <T@invalid.invalid> - 2020-01-19 22:13 -0800
Re: C String terminator Bonita Montero <Bonita.Montero@gmail.com> - 2020-01-21 19:49 +0100
Re: C String terminator John Bode <jfbode1029@gmail.com> - 2020-01-21 15:33 -0800
Re: C String terminator Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-21 23:19 -0800
Re: C String terminator Bonita Montero <Bonita.Montero@gmail.com> - 2020-01-22 08:39 +0100
Re: C String terminator chad <cdalten@gmail.com> - 2020-01-22 06:59 -0800
Re: C String terminator Bonita Montero <Bonita.Montero@gmail.com> - 2020-01-22 18:44 +0100
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