Editing Indentation style (section)

=== Linux kernel ===

The [[Linux kernel]] source tree is styled in a variant of K&R.<ref>A detailed description of the style is given at [https://www.kernel.org/doc/html/latest/process/coding-style.html kernel.org].</ref> [[Linus Torvalds]] advises contributors to follow it. Attributes include:

* Uses [[tab character]]s for indentation (not spaces) and assumes [[tab stop]]s every 8 spaces
* Brace layout matches K&R, with the braces of function definitions on their own lines and the opening brace of compound statements on the same line as the control clause, separated by a space
* Labels in a <code>switch</code> statement are aligned with the enclosing block (there is only one level of indents)
* Maximum line length is 100 characters although the pre-2020 limit of 80 characters is preferred.<ref>{{cite web |last1=Larabel |first1=Michael |title=The Linux Kernel Deprecates The 80 Character Line Coding Style |url=https://www.phoronix.com/scan.php?page=news_item&px=Linux-Kernel-Deprecates-80-Col |website=Phoronix |publisher=Phoronix Media |access-date=1 May 2022}}</ref>
* A single-statement body of a compound statement (such as if, while, and do-while) does not need to be surrounded by curly braces. If, however, one or more of the substatements in an <code>if-else</code> statement require braces, then both substatements should be wrapped in braces:

<syntaxhighlight lang=c>
int power(int x, int y)
{
        int result;

        if (y < 0) {
                result = 0;
        } else {
                result = 1;
                while (y-- > 0)
                        result *= x;
        }
        return result;
}
</syntaxhighlight>