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| From | Kaz Kylheku <kaz@kylheku.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: When did K&R function declarations become obsolete? |
| Date | 2011-12-10 18:41 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <20111210103048.439@kylheku.com> (permalink) |
| References | <jc082n$27s4$1@colin.muc.de> |
On 2011-12-10, Alan Mackenzie <acm@muc.de> wrote:
> I think we can say that K&R function declarations are truly obsolete. In
> ~20 years of hacking C, I've only seen very old code which uses them.
These declarations are still a feature of the 1999 C language, but marked as
obsolescent ISO 9899:1999:
6.11.7 Function definitions
1 The use of function definitions with separate parameter identifier and
declaration lists (not prototype-format parameter type and identifier
declarators) is an obsolescent feature.
(If you want to know about the current draft status of this, Google it up;
I dont' know.)
> Presumably these declarations are still widely used in compiler validation
> suites but nowhere else.
They likely appear in some nonzero but impossible to quantify amount of legacy
code.
Some open source programs still use old style definitions, coupled with
prototype declarations.
E.g.:
int func PROTO(( char *, int ));
/* ... */
int func(a, b)
char *a;
int b;
{
/*...*/
}
Are these programs rare? In some sense, yes, but in fact we do not have to go
far to find an example.
For instance, oh, the GNU C Library (glibc):
http://sourceware.org/git/?p=glibc.git;a=blob;f=io/open.c
Snippet retrieved Sat Dec 10 10:40:55 PST 2011:
/* Open FILE with access OFLAG. If OFLAG includes O_CREAT,
a third argument is the file protection. */
int
__open (file, oflag)
const char *file;
int oflag;
{
int mode;
if (file == NULL)
{
__set_errno (EINVAL);
return -1;
}
> Approximately when did they become obsolete, i.e. not used at all for new
> code?
This is impossible to know, without a crystal ball that peers into
what everyone on the planet is coding.
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When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-10 18:23 +0000
Re: When did K&R function declarations become obsolete? Kaz Kylheku <kaz@kylheku.com> - 2011-12-10 18:41 +0000
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-10 10:40 -0800
Re: When did K&R function declarations become obsolete? Ian Collins <ian-news@hotmail.com> - 2011-12-11 07:49 +1300
Re: When did K&R function declarations become obsolete? Ben Pfaff <blp@cs.stanford.edu> - 2011-12-10 10:49 -0800
Re: When did K&R function declarations become obsolete? jt@toerring.de (Jens Thoms Toerring) - 2011-12-10 21:16 +0000
Re: When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-12 11:29 +0000
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-12 03:49 -0800
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-12 15:04 +0000
Re: When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-13 10:42 +0000
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-13 13:58 +0000
Re: When did K&R function declarations become obsolete? "Scott Fluhrer" <sfluhrer@ix.netcom.com> - 2011-12-13 10:17 -0500
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-13 12:04 -0600
Re: When did K&R function declarations become obsolete? Kaz Kylheku <kaz@kylheku.com> - 2011-12-13 18:17 +0000
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-13 15:17 -0600
Re: When did K&R function declarations become obsolete? Kaz Kylheku <kaz@kylheku.com> - 2011-12-13 21:46 +0000
Re: When did K&R function declarations become obsolete? Seebs <usenet-nospam@seebs.net> - 2011-12-13 22:04 +0000
Re: When did K&R function declarations become obsolete? jgk@panix.com (Joe keane) - 2011-12-13 23:07 +0000
Re: When did K&R function declarations become obsolete? Seebs <usenet-nospam@seebs.net> - 2011-12-13 23:23 +0000
Re: When did K&R function declarations become obsolete? Kaz Kylheku <kaz@kylheku.com> - 2011-12-14 00:26 +0000
Re: When did K&R function declarations become obsolete? blp@cs.stanford.edu (Ben Pfaff) - 2011-12-13 15:22 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-13 15:27 -0800
Re: When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-14 09:33 +0000
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-13 19:49 +0000
Re: When did K&R function declarations become obsolete? "Scott Fluhrer" <sfluhrer@ix.netcom.com> - 2011-12-13 14:54 -0500
Re: When did K&R function declarations become obsolete? luser- -droog <mijoryx@yahoo.com> - 2011-12-20 02:28 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-10 13:48 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-10 21:48 -0800
Re: When did K&R function declarations become obsolete? Ralph Spitzner <rasp@spitzner.org> - 2011-12-11 04:16 +0100
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-10 21:54 -0800
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-10 22:27 -0600
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-11 12:56 +0000
Re: When did K&R function declarations become obsolete? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-11 09:11 -0500
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-11 21:40 -0600
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-12 00:05 -0800
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-12 15:00 +0000
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-12 07:18 -0800
Re: When did K&R function declarations become obsolete? Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-13 00:55 -0800
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-13 07:50 -0800
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-12 11:15 -0600
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-12 11:17 -0600
Re: When did K&R function declarations become obsolete? jgk@panix.com (Joe keane) - 2011-12-12 21:57 +0000
Re: When did K&R function declarations become obsolete? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-12 18:15 -0500
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-11 15:10 -0600
Re: When did K&R function declarations become obsolete? James Kuyper <jameskuyper@verizon.net> - 2011-12-11 09:17 -0500
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-11 06:53 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-12 00:08 -0800
Re: When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-12 11:59 +0000
Re: When did K&R function declarations become obsolete? James Kuyper <jameskuyper@verizon.net> - 2011-12-12 07:47 -0500
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-12 11:59 -0800
Re: When did K&R function declarations become obsolete? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-12 18:17 -0500
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-12 15:43 -0800
Re: When did K&R function declarations become obsolete? André Gillibert <MetaEntropy.removeThis@gmail.com> - 2011-12-12 13:49 +0100
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-12 05:25 -0800
Re: When did K&R function declarations become obsolete? André Gillibert <MetaEntropy.removeThis@gmail.com> - 2011-12-12 14:35 +0100
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-12 15:21 +0000
Re: When did K&R function declarations become obsolete? Jonathan Leffler <jleffler@earthlink.net> - 2011-12-13 22:19 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-14 02:54 -0800
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-14 13:17 -0800
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