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From: Bruno <braoult@gmail.com>
To: 45160@debbugs.gnu.org
Subject: bug#45160: 27.1; [C] wrong indent for knr-style arguments declaration
Date: Thu, 10 Dec 2020 16:02:02 +0100	[thread overview]
Message-ID: <87h7otr9g5.fsf@lorien.i-did-not-set--mail-host-address--so-tickle-me> (raw)

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:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS GLIB NOTIFY INOTIFY LIBSELINUX
GNUTLS FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK2 X11 XDBE XIM
MODULES THREADS PDUMPER GMP

Important settings:
  value of $LC_MESSAGES: C
  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:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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format-spec rfc822 mml mml-sec password-cache epa derived epg epg-config
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radix-tree help-mode cc-mode cc-fonts easymenu cc-guess cc-menus cc-cmds
cc-styles cc-align cc-engine cc-vars cc-defs cl-loaddefs cl-lib tooltip
eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
timer select scroll-bar mouse jit-lock font-lock syntax facemenu
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custom widget hashtable-print-readable backquote threads inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 70553 13929)
 (symbols 48 8643 2)
 (strings 32 22665 2290)
 (string-bytes 1 841592)
 (vectors 16 13093)
 (vector-slots 8 166207 22348)
 (floats 8 23 93)
 (intervals 56 501 6)
 (buffers 1000 17))





             reply	other threads:[~2020-12-10 15:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-10 15:02 Bruno [this message]
2020-12-11 16:33 ` bug#45160: 27.1; [C] wrong indent for knr-style arguments declaration Alan Mackenzie
2020-12-11 19:22   ` Bruno Raoult
2020-12-12 14:48     ` Alan Mackenzie

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