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CodingStyle.md

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vim: spelllang=en tw=78

This is a short introduction to the coding style that shall be used. The below rules are applicable for all C source files, except the Ethernet drivers, for which the Linux Kernel coding style shall be used to minimize the differences).

Line length

  • Lines shall not exceed 78 characters.

Whitespace

  • Indentation shall be done using 4 space characters

  • No whitespace shall be left at the end of a line.

  • After commas, colons and semicolons, a single space shall be placed (if not followed by a line break).

  • Binary operators (=, ==, ~=, |, ||, etc.) shall be enclosed by 2 spaces (except . and ->).

Placing braces

  • Braces shall be placed in the following way (K&R style):
if (...) {
    ...
} else if (...) {
    ...
} else {
    ...
}

int function(...)
{
    ...
}

Defines and Macros

  • Defines and macros shall be named in CAPITAL letters. If a macro contains multiple statements, they should be enclosed by a 'do {} while (0)' loop. Macro parameters shall also be capital letters and shall be enclosed py parantheses if necessary.
#define MACRO(A, B) \
    do { \
        if ((A) == 1) { \
            statement(B); \
        } while (0)