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Groups > comp.lang.c > #385682
| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Running an editor from ANSI C |
| Date | 2024-06-07 02:37 -0700 |
| Organization | None to speak of |
| Message-ID | <871q59yty1.fsf@nosuchdomain.example.com> (permalink) |
| References | (5 earlier) <v3ru84$1eafb$1@dont-email.me> <87o78dzw1a.fsf@nosuchdomain.example.com> <v3te2i$1ms1q$1@dont-email.me> <87frtpznoa.fsf@nosuchdomain.example.com> <v3uimm$20jte$3@dont-email.me> |
Malcolm McLean <malcolm.arthur.mclean@gmail.com> writes:
> On 06/06/2024 23:55, Keith Thompson wrote:
>> Malcolm McLean <malcolm.arthur.mclean@gmail.com> writes:
>>> On 06/06/2024 20:54, Keith Thompson wrote:
>>>> David Brown <david.brown@hesbynett.no> writes:
>>>>> On 06/06/2024 10:27, Malcolm McLean wrote:
>>>>>> It does work. But my compiler warns about rmpnam() being deprecated.
>>>>>
>>>>> I presume you mean "tmpnam()" here. No, it has not been deprecated -
>>>>> not even in C23. I could be wrong, but this sounds like one of MSVC's
>>>>> arbitrary self-declared deprecations, using scare tactics to encourage
>>>>> people to use MSVC's own functions rather than standard C functions,
>>>>> thus locking you into their tools and platform.
>>>> [...]
>>>> You're right, tmpnam() is not deprecated either by ISO C or by
>>>> POSIX.
>>>> But tmpfile() is likely to be better for most purposes. It creates
>>>> a
>>>> file and returns a FILE*. tmpnam() returns a string pointer, and it's
>>>> possible that some other process could create a file with the same name
>>>> before the caller has a chance to create it.
>>>> (mkstemp() is more flexible, but is not defined by ISO C.)
>>>>
>>> I want to run nano (or vi, or ed), in a shell running a pure ansi C
>>> program. So the way to do it is to create a file, write the text you
>>> want edit to it, them call system("nano readme.txt"). Nano then grabs
>>> the cobsole, which is what you want. You then read the file to get
>>> the edited data.
>>>
>>> The shell isn't just a proof og concept. It has a practical purpose,
>>> because it is FileSystem XML file editor. Whilst I'm playing about
>>> putting Basic into it for fun, the real purpose is serious. And the
>>> user must have an easy way of editing text files in the FileSystem
>>> file.
>>>
>>> But it becomes effectively a virtual computer in its own right.
>> OK -- but that has nothing at all to do with my post, which was
>> about
>> how to generate the temporary file name.
>> One suggestion: rather than always using nano (which not everyone is
>> familiar with), try reading the $EDITOR environment variable to
>> determine what editor to use. Concatenating the value of
>> getenv("EDITOR"), followed by a space, followed by the file name, is
>> likely to give you a valid command you can pass to system(). Fall back
>> to nano if getenv("EDITOR") returns a null pointer.
>> (For historical reasons, the convention is to use $VISUAL if it's
>> set,
>> otherwise $EDITOR if it's set, otherwise some default. Originally
>> $VISUAL typically referred to a full-screen editor like vi and $EDITOR
>> to a line editor like ed, to be used when full-screen editing is not
>> available. That's unlikely to be relevant nowadays, and users typically
>> either don't set $VISUAL or set it to the same thing as $EDITOR.)
>> Don't do this for me; I'm not likely to use this. But others are
>> likely
>> to find it more user-friendly if they can use a chosen editor.
>
> Ah thank you. But then main has to take an extra parameter. Now will
> the shell still be absolutely robust, and completely portable, and run
> just anywhere?
What? Why would main need an extra parameter?
> THe user of course calls the shell with an option to specify an
> editor. But $EDITOR should be the default. I'm not the first person to
> do this.
I thought you said that you invoked nano unconditionally (which is of
course not portable to systems that don't have nano installed).
As for portability, I'm not aware of the $EDITOR convention being used
on non-POSIX systems. I suppose there's no real guarantee that, for
example, system("nano filename") will invoke nano on the named file;
different systems could have different command syntax.
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */
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Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-05 11:59 +0100
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-06 01:18 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-06 03:47 +0100
Re: Running an editor from ANSI C Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-06-06 06:40 +0200
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-06 04:47 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-06 09:27 +0100
Re: Running an editor from ANSI C David Brown <david.brown@hesbynett.no> - 2024-06-06 11:07 +0200
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-06 14:34 +0100
Re: Running an editor from ANSI C scott@slp53.sl.home (Scott Lurndal) - 2024-06-06 13:54 +0000
Re: Running an editor from ANSI C Richard Harnden <richard.nospam@gmail.invalid> - 2024-06-06 15:13 +0100
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-06 15:35 +0100
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-07 00:40 +0000
Re: Running an editor from ANSI C Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-06-06 12:54 -0700
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-06 23:43 +0100
Re: Running an editor from ANSI C Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-06-06 15:55 -0700
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-07 10:08 +0100
Re: Running an editor from ANSI C Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-06-07 02:37 -0700
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-07 10:47 +0000
Re: Running an editor from ANSI C Michael S <already5chosen@yahoo.com> - 2024-06-07 14:24 +0300
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-07 23:57 +0000
Re: Running an editor from ANSI C Michael S <already5chosen@yahoo.com> - 2024-06-08 22:13 +0300
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-08 22:06 +0100
Re: Running an editor from ANSI C scott@slp53.sl.home (Scott Lurndal) - 2024-06-09 14:28 +0000
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-09 07:24 +0000
Re: Running an editor from ANSI C Michael S <already5chosen@yahoo.com> - 2024-06-09 11:36 +0300
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-09 22:29 +0000
Re: Running an editor from ANSI C Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-06-08 13:51 -0700
Re: Running an editor from ANSI C Kaz Kylheku <643-408-1753@kylheku.com> - 2024-06-09 00:27 +0000
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-09 07:30 +0000
Re: Running an editor from ANSI C Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-06-09 14:48 -0700
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-09 07:29 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-07 13:57 +0100
Re: Running an editor from ANSI C Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-06-07 19:56 +0200
Re: Running an editor from ANSI C scott@slp53.sl.home (Scott Lurndal) - 2024-06-07 18:10 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-07 19:52 +0100
Re: Running an editor from ANSI C Richard Harnden <richard.nospam@gmail.invalid> - 2024-06-07 20:08 +0100
Re: Running an editor from ANSI C Ben Bacarisse <ben@bsb.me.uk> - 2024-06-07 20:09 +0100
Re: Running an editor from ANSI C Kaz Kylheku <643-408-1753@kylheku.com> - 2024-06-07 20:37 +0000
Re: Running an editor from ANSI C Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-06-07 12:39 -0700
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-08 00:34 +0000
Re: Running an editor from ANSI C "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-06-07 23:35 -0700
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-08 08:24 +0000
Re: Running an editor from ANSI C "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-06-10 13:28 -0700
Re: Running an editor from ANSI C scott@slp53.sl.home (Scott Lurndal) - 2024-06-07 14:02 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-07 20:06 +0100
Re: Running an editor from ANSI C scott@slp53.sl.home (Scott Lurndal) - 2024-06-07 20:06 +0000
Re: Running an editor from ANSI C Kaz Kylheku <643-408-1753@kylheku.com> - 2024-06-07 04:46 +0000
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-07 00:36 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-07 10:13 +0100
Re: Running an editor from ANSI C David Brown <david.brown@hesbynett.no> - 2024-06-07 11:31 +0200
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-07 10:46 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-07 13:47 +0100
Re: Running an editor from ANSI C James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-06-07 09:32 -0400
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-07 23:59 +0000
Re: Running an editor from ANSI C James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-06-08 01:40 -0400
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-08 08:21 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-08 13:43 +0100
Re: Running an editor from ANSI C "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-06-08 12:00 -0700
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-09 03:30 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-08 12:32 +0100
Re: Running an editor from ANSI C David Brown <david.brown@hesbynett.no> - 2024-06-07 16:48 +0200
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-07 19:38 +0100
Re: Running an editor from ANSI C scott@slp53.sl.home (Scott Lurndal) - 2024-06-07 20:04 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-08 00:00 +0100
Re: Running an editor from ANSI C Kaz Kylheku <643-408-1753@kylheku.com> - 2024-06-08 00:36 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-08 12:07 +0100
Re: Running an editor from ANSI C James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-06-08 01:54 -0400
Re: Running an editor from ANSI C Kaz Kylheku <643-408-1753@kylheku.com> - 2024-06-08 00:32 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-08 12:23 +0100
Re: Running an editor from ANSI C Kaz Kylheku <643-408-1753@kylheku.com> - 2024-06-08 18:07 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-08 22:01 +0100
Re: Running an editor from ANSI C David Brown <david.brown@hesbynett.no> - 2024-06-09 17:49 +0200
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-10 12:31 +0100
Re: Running an editor from ANSI C David Brown <david.brown@hesbynett.no> - 2024-06-10 14:12 +0200
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-10 14:19 +0100
Re: Running an editor from ANSI C Richard Harnden <richard.nospam@gmail.invalid> - 2024-06-10 18:14 +0100
Re: Running an editor from ANSI C scott@slp53.sl.home (Scott Lurndal) - 2024-06-10 17:37 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-11 05:24 +0100
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-11 05:52 +0000
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-12 09:08 +0100
Re: Running an editor from ANSI C David Brown <david.brown@hesbynett.no> - 2024-06-12 11:00 +0200
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-12 10:57 +0100
Re: Running an editor from ANSI C Richard Harnden <richard.nospam@gmail.invalid> - 2024-06-12 13:43 +0100
Re: Running an editor from ANSI C David Brown <david.brown@hesbynett.no> - 2024-06-12 14:54 +0200
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-12 15:42 +0100
Re: Running an editor from ANSI C Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-06-12 14:34 -0700
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-12 23:45 +0100
Re: Running an editor from ANSI C tTh <tth@none.invalid> - 2024-06-12 12:37 +0200
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-12 12:10 +0100
Re: Running an editor from ANSI C David Brown <david.brown@hesbynett.no> - 2024-06-12 15:04 +0200
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-06 04:46 +0000
Re: Running an editor from ANSI C BGB <cr88192@gmail.com> - 2024-06-06 00:34 -0500
Re: Running an editor from ANSI C Mikko <mikko.levanto@iki.fi> - 2024-06-06 18:42 +0300
Re: Running an editor from ANSI C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2024-06-06 17:08 +0100
Re: Running an editor from ANSI C scott@slp53.sl.home (Scott Lurndal) - 2024-06-06 17:56 +0000
Re: Running an editor from ANSI C Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-06-06 22:56 +0000
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