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| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: // comments and \ |
| Date | 2015-12-23 13:00 -0800 |
| Organization | None to speak of |
| Message-ID | <lnfuys519l.fsf@kst-u.example.com> (permalink) |
| References | <n3k52h$cjq$1@dont-email.me> <lnfuzmultj.fsf@kst-u.example.com> <undi7b5ct823427h92k2epmh9j1ppshvfq@4ax.com> <n5f0df$lfs$1@dont-email.me> |
"Charles Richmond" <numerist@aquaporin4.com> writes:
> "David Thompson" <dave.thompson2@verizon.net> wrote in message
> news:undi7b5ct823427h92k2epmh9j1ppshvfq@4ax.com...
>> On Tue, 01 Dec 2015 09:21:12 -0800, Keith Thompson <kst-u@mib.org>
>> wrote:
>>> It's actually a bit worse than that. Consider this program:
>>>
>>> #include <stdio.h>
>>> int main(void) {
>>> // \
>>> puts("This is a comment");
>>> puts("This is not a comment");
>>> }
>>>
>>> You can't see it, but there's a space after the backslash on line 3
>>> (assuming it's not stripped by somebody's news software).
>>
>> <snip: compilers inconsistent; wrong description corrected later>
>>
>> C90 7.9.2 and successors (all) say that for a text stream, which is
>> inherently at runtime in a hosted implementation, whether trailing
>> spaces 'appear' (or are lost/stripped) is I-D.
>>
>> Nothing says C source files must be C text files. But their content is
>> remarkably* text-like, and except for crosscompiler or freestanding,
>> given that you must implement runtime text files anyway, using them
>> also for source files isn't obviously insane.
>
> ISTM that the C standard (maybe all of them) allowed certain control
> characters in C source files. In the past, people I know have embedded
> control-L to cause a form feed when the source is printed out. I think
> there are a few other control characters allowed.
>
> This might still be considered a text file I suppose.
The characters allowed in a C source file are the members of the
*source character set*, which includes the *basic source character
set* as a subset. The basic source character set includes the
horizontal tab, vertical tab, and form feed control characters,
all of which are white space characters.
Members of the source character set outside the basic source
character set are implementation-defined, and might include
additional control characters. In addition, physical source
characters are mapped to the source character set in an
implementation-defined manner in translation phase 1.
This is described in N1570 section 5.2.1 and 5.1.1.2.
None of this is necessarily relevant to the issue being discussed.
Possibly translation phase 1 *might* remove trailing spaces, but
it's not entirely clear that it's allowed to do so. The standard
says that physical source characters are "mapped" to the source
character set; I'm not sure what that mapping is permitted to do.
--
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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// comments and \ BartC <bc@freeuk.com> - 2015-12-01 12:52 +0000
Re: // comments and \ me <self@example.org> - 2015-12-01 13:08 +0000
Re: // comments and \ Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-12-01 08:20 -0500
Re: // comments and \ me <self@example.org> - 2015-12-01 13:36 +0000
Re: // comments and \ Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-12-01 09:03 -0500
Re: // comments and \ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-12-01 14:14 +0000
Re: // comments and \ supercat@casperkitty.com - 2015-12-01 07:40 -0800
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-01 08:55 -0800
Re: // comments and \ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-12-01 17:15 +0000
Re: // comments and \ supercat@casperkitty.com - 2015-12-01 09:58 -0800
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 18:11 +0000
Re: // comments and \ supercat@casperkitty.com - 2015-12-01 10:18 -0800
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 18:20 +0000
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-01 11:07 -0800
Re: // comments and \ supercat@casperkitty.com - 2015-12-01 11:39 -0800
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-01 12:33 -0800
Re: // comments and \ glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-12-02 01:05 +0000
Re: // comments and \ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-12-01 19:30 +0000
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-01 20:59 +0100
Re: // comments and \ James Kuyper <jameskuyper@verizon.net> - 2015-12-01 15:22 -0500
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 20:37 +0000
Re: // comments and \ Robert Wessel <robertwessel2@yahoo.com> - 2015-12-01 14:56 -0600
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-01 22:11 +0100
Re: // comments and \ Philip Lantz <prl@canterey.us> - 2015-12-02 03:01 -0800
Re: // comments and \ glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-12-02 00:45 +0000
Re: // comments and \ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-12-01 07:52 -0700
Re: // comments and \ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-12-01 15:19 +0000
Re: // comments and \ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-12-01 08:29 -0700
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 15:35 +0000
Re: // comments and \ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-12-01 09:21 -0700
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 16:41 +0000
Re: // comments and \ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-12-01 10:15 -0700
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 17:24 +0000
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 17:43 +0000
Re: // comments and \ Philip Lantz <prl@canterey.us> - 2015-12-02 03:05 -0800
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-02 11:40 +0000
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-02 04:29 -0800
Re: // comments and \ BartC <bc@freeuk.com> - 2015-12-01 19:11 +0000
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-01 20:43 +0000
Re: // comments and \ BartC <bc@freeuk.com> - 2015-12-01 21:04 +0000
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-01 21:16 +0000
Re: // comments and \ Philip Lantz <prl@canterey.us> - 2015-12-02 03:12 -0800
Re: // comments and \ BartC <bc@freeuk.com> - 2015-12-02 11:52 +0000
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-02 04:40 -0800
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-02 13:55 +0100
Re: // comments and \ BartC <bc@freeuk.com> - 2015-12-02 13:56 +0000
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-02 15:24 +0100
Re: // comments and \ supercat@casperkitty.com - 2015-12-02 06:54 -0800
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-02 16:40 +0100
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-02 18:24 +0000
Re: // comments and \ Öö Tiib <ootiib@hot.ee> - 2015-12-02 20:27 -0800
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-02 23:22 -0800
Re: // comments and \ Öö Tiib <ootiib@hot.ee> - 2015-12-03 00:57 -0800
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-03 23:44 +0000
Re: // comments and \ Öö Tiib <ootiib@hot.ee> - 2015-12-03 21:17 -0800
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-05 00:43 +0000
Re: // comments and \ Les Cargill <lcargill99@comcast.com> - 2015-12-04 20:32 -0600
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-05 16:06 +0000
Re: // comments and \ Les Cargill <lcargill99@comcast.com> - 2015-12-05 13:10 -0600
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-06 10:18 +0000
Re: // comments and \ Les Cargill <lcargill99@comcast.com> - 2015-12-06 14:26 -0600
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-03 12:45 +0100
Re: // comments and \ raltbos@xs4all.nl (Richard Bos) - 2015-12-04 11:45 +0000
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-04 04:20 -0800
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-04 14:20 +0100
Re: // comments and \ James Kuyper <jameskuyper@verizon.net> - 2015-12-04 10:05 -0500
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-04 17:31 +0100
Re: // comments and \ Les Cargill <lcargill99@comcast.com> - 2015-12-04 17:24 -0600
Re: // comments and \ James Kuyper <jameskuyper@verizon.net> - 2015-12-04 18:50 -0500
Re: // comments and \ Les Cargill <lcargill99@comcast.com> - 2015-12-04 20:34 -0600
Re: // comments and \ raltbos@xs4all.nl (Richard Bos) - 2015-12-10 20:40 +0000
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-04 09:36 -0800
Re: // comments and \ Richard Damon <Richard@Damon-Family.org> - 2015-12-05 09:05 -0500
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-05 17:42 +0000
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-06 22:23 +0100
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-07 21:59 +0000
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-05 15:50 +0000
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-05 18:17 +0100
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-06 10:01 +0000
Re: // comments and \ Öö Tiib <ootiib@hot.ee> - 2015-12-06 03:05 -0800
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-06 04:07 -0800
Re: // comments and \ Öö Tiib <ootiib@hot.ee> - 2015-12-06 04:37 -0800
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-06 05:05 -0800
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-06 12:19 -0800
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-06 13:59 +0000
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-06 06:09 -0800
Re: // comments and \ Öö Tiib <ootiib@hot.ee> - 2015-12-06 07:30 -0800
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-06 18:55 +0000
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-06 12:23 -0800
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-06 12:22 -0800
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-06 21:06 +0000
Re: // comments and \ Les Cargill <lcargill99@comcast.com> - 2015-12-05 13:14 -0600
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-06 10:09 +0000
Re: // comments and \ mark.bluemel@gmail.com - 2015-12-03 06:15 -0800
Re: // comments and \ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-12-02 08:28 -0700
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-02 09:01 -0800
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-02 21:52 +0000
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-02 16:55 -0800
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-03 13:11 +0100
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-03 23:21 +0000
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-04 11:22 +0100
Re: // comments and \ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-12-05 01:12 +0000
Re: // comments and \ Les Cargill <lcargill99@comcast.com> - 2015-12-04 20:39 -0600
Re: // comments and \ raltbos@xs4all.nl (Richard Bos) - 2015-12-04 11:14 +0000
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-04 12:25 +0000
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-04 14:23 +0100
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-01 09:00 -0800
Re: // comments and \ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-12-01 19:46 +0000
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 20:36 +0000
Re: // comments and \ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-12-01 20:37 -0700
Re: // comments and \ BartC <bc@freeuk.com> - 2015-12-01 14:26 +0000
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 14:32 +0000
Re: // comments and \ BartC <bc@freeuk.com> - 2015-12-01 14:52 +0000
Re: // comments and \ David Brown <david.brown@hesbynett.no> - 2015-12-01 16:15 +0100
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 15:28 +0000
Re: // comments and \ glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-12-02 01:26 +0000
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-01 09:12 -0800
Re: // comments and \ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-12-01 19:17 +0000
Re: // comments and \ Robert Wessel <robertwessel2@yahoo.com> - 2015-12-01 12:32 -0600
Re: // comments and \ Nobody <nobody@nowhere.invalid> - 2015-12-02 00:01 +0000
Re: // comments and \ supercat@casperkitty.com - 2015-12-02 07:08 -0800
Re: // comments and \ Nobody <nobody@nowhere.invalid> - 2015-12-02 21:05 +0000
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-02 14:22 -0800
Re: // comments and \ supercat@casperkitty.com - 2015-12-02 14:48 -0800
Re: // comments and \ glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-12-02 23:37 +0000
Re: // comments and \ supercat@casperkitty.com - 2015-12-02 17:10 -0800
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-02 19:24 -0800
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-03 04:10 +0000
Re: // comments and \ Philip Lantz <prl@canterey.us> - 2015-12-02 21:49 -0800
Re: // comments and \ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-12-03 07:28 -0700
Re: // comments and \ supercat@casperkitty.com - 2015-12-03 09:12 -0800
Re: // comments and \ supercat@casperkitty.com - 2015-12-03 06:53 -0800
Re: // comments and \ supercat@casperkitty.com - 2015-12-03 15:41 -0800
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-03 15:56 -0800
Re: // comments and \ supercat@casperkitty.com - 2015-12-03 16:44 -0800
Re: // comments and \ Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-12-03 17:29 -0800
Re: // comments and \ supercat@casperkitty.com - 2015-12-03 19:10 -0800
Re: // comments and \ Philip Lantz <prl@canterey.us> - 2015-12-02 21:59 -0800
Re: // comments and \ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-12-01 07:52 -0700
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-01 09:21 -0800
Re: // comments and \ Richard Heathfield <rjh@cpax.org.uk> - 2015-12-01 17:26 +0000
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-01 10:50 -0800
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-01 10:49 -0800
Re: // comments and \ Geoff <geoff@invalid.invalid> - 2015-12-01 11:34 -0800
Re: // comments and \ David Thompson <dave.thompson2@verizon.net> - 2015-12-22 06:44 -0500
Re: // comments and \ "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-23 14:35 -0600
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-23 13:00 -0800
Re: // comments and \ James Kuyper <jameskuyper@verizon.net> - 2015-12-23 16:58 -0500
Re: // comments and \ Keith Thompson <kst-u@mib.org> - 2015-12-23 14:21 -0800
Re: // comments and \ James Kuyper <jameskuyper@verizon.net> - 2015-12-23 16:55 -0500
Re: // comments and \ Öö Tiib <ootiib@hot.ee> - 2015-12-01 12:24 -0800
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