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| From | James Kuyper <jameskuyper@verizon.net> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: trigraphs, yecch |
| Date | 2012-01-31 23:17 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <jgaece$76o$1@dont-email.me> (permalink) |
| References | <4f2808f4.648026530@text.giganews.com> <ln4nvbxxkb.fsf@nuthaus.mib.org> <86aa53e59d.fsf@zipcon.net> |
On 01/31/2012 08:01 PM, Patrick Scheible wrote:
> Keith Thompson <kst-u@mib.org> writes:
...
>> For reference, there are exactly 9 trigraphs. C99 5.2.1.1:
>>
>> All occurrences in a source file of the following sequences of three
>> characters (called trigraph sequences) are replaced with the
>> corresponding single character.
>>
>> ??= # ??) ] ??! |
>> ??( [ ??' ^ ??> }
>> ??/ \ ??< { ??- ~
>>
>> No other trigraph sequences exist. Each ? that does not begin one of
>> the trigraphs listed above is not changed.
>>
>> In your case, "???" is not a trigraph, but ??) is.
>
> Has the C standards committee been flamed enough for trigraphs? I don't
> think so. I bet there's 1000 programmers bitten by them for every 1
> who's been helped. By 1989 anyone who didn't have an editor capable of
> typing any 7-bit ASCII character ...
Every single one of the characters for which there's a corresponding
trigraph sequence, is on that list precisely it's not in the "invariant
set" supported by all of the national variants of the ISO/IEC 646 7-bit
encoding. If you lived in one of the nations for which those national
variants was created, an editor which supported only strict 7-bit ASCII
would not have been very useful - that's precisely why the national
variants were created.
There are work-arounds; such as standard conventions for transliterating
a German letter such as รถ into oe, but those conventions implement
essentially the same idea as trigraphs: using multiple representable
characters to indirectly represent a single character that's not
directly representable.
> ... was a hopeless luddite who would be
> better served making their own pre-preprocessing phase for C and leaving
> the language unchanged instead of another phase in the preprocessor for
> every C program forever and ever.
I'm not arguing that trigraphs were a good solution to the problem. But
restricting editors to 7-bit ASCII was not an acceptable solution,
either. That's why one of the Scandinavian countries (I forget which
one) refused to approve the C standard until some accomodation was made
to the needs of people for whom 7-bit ASCII was unacceptable. The result
was a political compromise, and like most such, it was equally
unattractive to all parties engaged in the negotiations.
--
James Kuyper
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trigraphs, yecch cri@tiac.net (Richard Harter) - 2012-01-31 15:55 +0000
Re: trigraphs, yecch pete <pfiland@mindspring.com> - 2012-01-31 11:05 -0500
Re: trigraphs, yecch Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-31 16:47 +0000
Re: trigraphs, yecch cri@tiac.net (Richard Harter) - 2012-01-31 17:21 +0000
Re: trigraphs, yecch James Kuyper <jameskuyper@verizon.net> - 2012-01-31 12:26 -0500
Re: trigraphs, yecch Robert Wessel <robertwessel2@yahoo.com> - 2012-01-31 11:40 -0600
Re: trigraphs, yecch Keith Thompson <kst-u@mib.org> - 2012-01-31 15:22 -0800
Re: trigraphs, yecch "BartC" <bc@freeuk.com> - 2012-02-01 01:09 +0000
Re: trigraphs, yecch James Kuyper <jameskuyper@verizon.net> - 2012-01-31 22:21 -0500
Re: trigraphs, yecch Keith Thompson <kst-u@mib.org> - 2012-01-31 21:25 -0800
Re: trigraphs, yecch "Charles Richmond" <netnews@aquaporin4.com> - 2012-01-31 23:40 -0600
Re: trigraphs, yecch Keith Thompson <kst-u@mib.org> - 2012-01-31 22:19 -0800
Re: trigraphs, yecch James Kuyper <jameskuyper@verizon.net> - 2012-02-01 08:27 -0500
Re: trigraphs, yecch Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-31 17:47 +0000
Re: trigraphs, yecch ImpalerCore <jadill33@gmail.com> - 2012-01-31 09:41 -0800
Re: trigraphs, yecch pete <pfiland@mindspring.com> - 2012-01-31 13:17 -0500
Re: trigraphs, yecch blp@cs.stanford.edu (Ben Pfaff) - 2012-01-31 09:56 -0800
Re: trigraphs, yecch Peter Nilsson <airia@acay.com.au> - 2012-01-31 13:55 -0800
Re: trigraphs, yecch Harald van Dijk <haraldvdijk@gmail.com> - 2012-01-31 14:02 -0800
Re: trigraphs, yecch blp@cs.stanford.edu (Ben Pfaff) - 2012-01-31 14:06 -0800
Re: trigraphs, yecch Harald van Dijk <haraldvdijk@gmail.com> - 2012-01-31 15:13 -0800
Re: trigraphs, yecch "Charles Richmond" <netnews@aquaporin4.com> - 2012-01-31 23:44 -0600
Re: trigraphs, yecch Keith Thompson <kst-u@mib.org> - 2012-01-31 22:20 -0800
Re: trigraphs, yecch James Harris <james.harris.1@googlemail.com> - 2012-01-31 22:56 -0800
Re: trigraphs, yecch Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-01 12:15 +0000
Re: trigraphs, yecch Keith Thompson <kst-u@mib.org> - 2012-01-31 15:27 -0800
Re: trigraphs, yecch Patrick Scheible <kkt@zipcon.net> - 2012-01-31 17:01 -0800
Re: trigraphs, yecch Keith Thompson <kst-u@mib.org> - 2012-01-31 19:50 -0800
Re: trigraphs, yecch Patrick Scheible <kkt@zipcon.net> - 2012-02-01 10:31 -0800
Re: trigraphs, yecch James Kuyper <jameskuyper@verizon.net> - 2012-01-31 23:17 -0500
Re: trigraphs, yecch "Joachim Schmitz" <nospam.jojo@schmitz-digital.de> - 2012-02-01 10:39 +0100
Re: trigraphs, yecch Kaz Kylheku <kaz@kylheku.com> - 2012-02-01 17:20 +0000
Re: trigraphs, yecch Patrick Scheible <kkt@zipcon.net> - 2012-02-01 11:11 -0800
Re: trigraphs, yecch "Charles Richmond" <netnews@aquaporin4.com> - 2012-01-31 23:50 -0600
Re: trigraphs, yecch ralph <nt_consulting64@yahoo.net> - 2012-02-01 11:56 -0600
Re: trigraphs, yecch Patrick Scheible <kkt@zipcon.net> - 2012-02-01 11:12 -0800
Re: trigraphs, yecch Stephen Sprunk <stephen@sprunk.org> - 2012-02-01 13:29 -0600
Re: trigraphs, yecch blp@cs.stanford.edu (Ben Pfaff) - 2012-02-01 11:35 -0800
Re: trigraphs, yecch Kaz Kylheku <kaz@kylheku.com> - 2012-02-01 19:59 +0000
Re: trigraphs, yecch blp@cs.stanford.edu (Ben Pfaff) - 2012-02-01 12:41 -0800
Re: trigraphs, yecch Kaz Kylheku <kaz@kylheku.com> - 2012-02-01 22:55 +0000
Re: trigraphs, yecch Stephen Sprunk <stephen@sprunk.org> - 2012-02-01 14:44 -0600
Re: trigraphs, yecch Kaz Kylheku <kaz@kylheku.com> - 2012-02-01 22:55 +0000
Re: trigraphs, yecch "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2012-02-02 14:19 -0800
Re: trigraphs, yecch Patrick Scheible <kkt@zipcon.net> - 2012-02-06 20:40 -0800
Re: trigraphs, yecch "Joachim Schmitz" <nospam.jojo@schmitz-digital.de> - 2012-02-07 11:40 +0100
Re: trigraphs, yecch jgk@panix.com (Joe keane) - 2012-02-02 14:15 +0000
Re: trigraphs, yecch cri@tiac.net (Richard Harter) - 2012-02-01 16:52 +0000
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