--- Begin Message ---
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Subject: |
27.1; [C] wrong indent for knr-style arguments declaration |
|
Date: |
Thu, 10 Dec 2020 16:02:02 +0100 |
Within "emacs -Q" session, open the following C source file:
------------------------------ foo.c
int f(i, j, k)
int i;
int j;
int k;
{
return 1;
}
int g(i, j, k)
int i;
int j, k;
{
return 1;
}
------------------------------
Then, do "C-c ." (c-set-style) to "k&r", and "c-c c-o" (c-set-offset),
and set "knr-argdecl-intro" to "+".
We have now the following values in c-offsets-alist :
knr-argdecl-intro : + (First line of a K&R C argument declaration)
knr-argdecl : 0 (Subsequent lines in a K&R C argument declaration)
re-indent foo.c. At this stage we expect the following indentation for
arguments declarations.
------------------------------ expected indentation
int f(i, j, k)
int i;
int j;
int k;
{
return 1;
}
int g(i, j, k)
int i;
int j, k;
{
return 1;
}
------------------------------
But we get the following result (please note line 11).
------------------------------ emacs indentation
int f(i, j, k)
int i;
int j;
int k;
{
return 1;
}
int g(i, j, k)
int i;
int j, k;
{
return 1;
}
------------------------------
It should be noted that if we separate each argument on separate lines
(function f), indentation is correct.
It is incorrect if multiple variables are in same declaration (function
g).
Also, multiple variables on first arguments declaration line seems to
have correct indentation.
Regards,
Bruno.
In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32)
of 2020-10-29 built on lorien
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Ubuntu 20.04.1 LTS
Recent messages:
End of buffer [3 times]
Beginning of buffer [3 times]
Making completion list...
Beginning of buffer [3 times]
previous-line: Beginning of buffer
user-error: No further undo information
C-x C-g is undefined
previous-line: Beginning of buffer [10 times]
scroll-up-command: End of buffer
command-execute: Buffer is read-only: #<buffer *Bug Help*>
Quit
Configured features:
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value of $LC_MONETARY: en_IE.UTF-8
value of $LC_NUMERIC: en_IE.UTF-8
value of $LC_TIME: en_IE.UTF-8
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Fundamental
Minor modes in effect:
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mouse-wheel-mode: t
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Memory information:
((conses 16 70553 13929)
(symbols 48 8643 2)
(strings 32 22665 2290)
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--- End Message ---
--- Begin Message ---
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Subject: |
Re: bug#45160: 27.1; [C] wrong indent for knr-style arguments declaration |
|
Date: |
Sat, 12 Dec 2020 14:48:52 +0000 |
Hello again, Bruno.
On Fri, Dec 11, 2020 at 20:22:19 +0100, Bruno Raoult wrote:
> Thanks Alan,
[ .... ]
> > The following patch should fix the problem. Would you please apply
> > it to your Emacs (cc-engine.el is in .../emacs/lisp/progmodes) and
> > byte compile cc-engine.el. Then please try it out on your real
> > source code, and either confirm the bug has indeed been fixed, or say
> > what's still wrong. (If you would like any help with the patching or
> > byte compiling, feel free to send me private email.)
> That fix was really fast !
It was a high quality bug report, and easy to diagnose.
> I applied the patch, and it appears to work in a few source files I did
> try. I did not notice any side effect so far : I will keep your
> version, and let you know (in this bug thread) if I notice any issue
> that is not present in original version.
Thank you for such a fast test. I am closing the bug with this post.
> Thanks again,
> Bruno.
> --
> 2 + 2 = 5, for very large values of 2.
--
Alan Mackenzie (Nuremberg, Germany).
--- End Message ---