source: branches/samba-3.2.x/README.Coding@ 447

##
## Coding conventions in the Samba 3.0 tree
##

===========
Quick Start
===========

Coding style guidelines are about reducing the number of unnecessary
reformatting patches and making things easier developers to work together.
You don't have to like them or even agree with them, but once put in place
we all have to abide by them (or vote to change them).  However, coding
style should never outweigh coding itself and so the the guidelines
described here are hopefully easier enough to follow as they are very
common and supported by tools and editors.

The basic style, also mentioned in the SAMBA_4_0/prog_guide.txt is the
Linux kernel coding style (See Documentation/CodingStyle in the kernel
source tree).  The closely matches what most Samba developers use already
anyways.

But to save you the trouble of reading the Linux kernel style guide, here
are the highlights.


* Maximum Line Width is 80 Characters
  The reason is not for people with low-res screens but rather sticking
  to 80 columns prevents you from easily nesting more than one level of
  if statements or other code blocks.  Use source/script/count_80_col.pl
  to check your changes.

* Use 8 Space Tabs to Indent
  No whitespace filler.

* No Trailing Whitespace
  Use source/script/strip_trail_ws.pl to clean you files before committing.

* Follow the K&R guidelines.  We won't go throw them all here.  You have
  a copy of "The C Programming Language" anyways right?  You can also use
  the format_indent.sh script found in source/script/ if all else fails.



============
Editor Hints
============

Emacs
-----
Add the follow to your $HOME/.emacs file:

  (add-hook 'c-mode-hook
        (lambda ()
                (c-set-style "linux")
                (c-toggle-auto-state)))


Vi
--
(Thanks to SATOH Fumiyasu <[email protected]> for these hints):

For the basic vi editor including with all variants of *nix, add the 
following to $HOME/.exrc:

  set tabstop=8
  set shiftwidth=8

For Vim, the following settings in $HOME/.vimrc will also deal with 
displaying trailing whitespace:

  if has("syntax") && (&t_Co > 2 || has("gui_running"))
        syntax on
        function! ActivateInvisibleCharIndicator()
                syntax match TrailingSpace "[ \t]\+$" display containedin=ALL
                highlight TrailingSpace ctermbg=Red
        endf
        autocmd BufNewFile,BufRead * call ActivateInvisibleCharIndicator()
  endif
  " Show tabs, trailing whitespace, and continued lines visually
  set list listchars=tab:»·,trail:·,extends:


  " highlight overly long lines same as TODOs.
  set textwidth=80
  autocmd BufNewFile,BufRead *.c,*.h exec 'match Todo /\%>' . &textwidth . 'v.\+/'


=========================
FAQ & Statement Reference
=========================

Comments
--------

Comments should always use the standard C syntax.  I.e. /* ... */.  C++ 
style comments are not currently allowed.


Indention & Whitespace & 80 columns
-----------------------------------

To avoid confusion, indentations are to be 8 character with tab (not 
8 ' ' characters.  When wrapping parameters for function calls, 
alignment parameter list with the first parameter on the previous line.
Use tabs to get as close as possible and then fill in the final 7 
characters or less with whitespace.  For example,

        var1 = foo(arg1, arg2,
                   arg3);

The previous example is intended to illustrate alignment of function 
parameters across lines and not as encourage for gratuitous line 
splitting.  Never split a line before columns 70 - 79 unless you
have a really good reason.  Be smart about formatting.


If, switch, & Code blocks
-------------------------