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>47.1. Formatting</A
></H1
><P
> Source code formatting uses 4 column tab spacing, with
tabs preserved (i.e., tabs are not expanded to spaces).
Each logical indentation level is one additional tab stop.
</P
><P
> Layout rules (brace positioning, etc) follow BSD conventions. In
particular, curly braces for the controlled blocks of <TT
CLASS="LITERAL"
>if</TT
>,
<TT
CLASS="LITERAL"
>while</TT
>, <TT
CLASS="LITERAL"
>switch</TT
>, etc go on their own lines.
</P
><P
> Limit line lengths so that the code is readable in an 80-column window.
(This doesn't mean that you must never go past 80 columns. For instance,
breaking a long error message string in arbitrary places just to keep the
code within 80 columns is probably not a net gain in readability.)
</P
><P
> Do not use C++ style comments (<TT
CLASS="LITERAL"
>//</TT
> comments). Strict ANSI C
compilers do not accept them. For the same reason, do not use C++
extensions such as declaring new variables mid-block.
</P
><P
> The preferred style for multi-line comment blocks is
</P><PRE
CLASS="PROGRAMLISTING"
>/*
* comment text begins here
* and continues here
*/</PRE
><P>
Note that comment blocks that begin in column 1 will be preserved as-is
by <SPAN
CLASS="APPLICATION"
>pgindent</SPAN
>, but it will re-flow indented comment blocks
as though they were plain text. If you want to preserve the line breaks
in an indented block, add dashes like this:
</P><PRE
CLASS="PROGRAMLISTING"
> /*----------
* comment text begins here
* and continues here
*----------
*/</PRE
><P>
</P
><P
> While submitted patches do not absolutely have to follow these formatting
rules, it's a good idea to do so. Your code will get run through
<SPAN
CLASS="APPLICATION"
>pgindent</SPAN
> before the next release, so there's no point in
making it look nice under some other set of formatting conventions.
A good rule of thumb for patches is <SPAN
CLASS="QUOTE"
>"make the new code look like
the existing code around it"</SPAN
>.
</P
><P
> The <TT
CLASS="FILENAME"
>src/tools</TT
> directory contains sample settings
files that can be used with the <SPAN
CLASS="PRODUCTNAME"
>emacs</SPAN
>,
<SPAN
CLASS="PRODUCTNAME"
>xemacs</SPAN
> or <SPAN
CLASS="PRODUCTNAME"
>vim</SPAN
>
editors to help ensure that they format code according to these
conventions.
</P
><P
> The text browsing tools <SPAN
CLASS="APPLICATION"
>more</SPAN
> and
<SPAN
CLASS="APPLICATION"
>less</SPAN
> can be invoked as:
</P><PRE
CLASS="PROGRAMLISTING"
>more -x4
less -x4</PRE
><P>
to make them show tabs appropriately.
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