The coding style varies a bit with author and age of the code. When
changing existing code emulate its style. If you disagree with a
certain style, format code the way you are more comfortable with.
These are all merely guidelines - use common sense.

Here are some general guidelines for new code:
 * Similar to GNU formatting.
 * Indention is two spaces, no tabs.
 * Avoid curly brackets after if/while/do for single statements  
   (as in the Linux kernel) but only if the statement needs
   no comment lines.
 * One space right and left of assignment operators,
   none around normal operators (such as in "a = b+c;").
   Other formatting is also common. Use extra spaces if it helps
   readability in complex expressions.
 * Usually all capital with underscores for global constants.
   Sometimes also with lower case.
 * Mixed case with first upper case character for methods
   and functions. Inside the engine lower case beginning is more
   common.
 * Lower case for variables, if necessary upper case characters
   in the middle to separate words.
 * Prefix and suffix characters for entity names are used:
   prefix a: function and method argument, may also be
             replaced with other letters to denote special
             context (e.g., m = module, s = session)
   prefix c: constant
   prefix f: class or struct data member ("field")
   prefix T: structured type or enum
   suffix P[P]: pointer [to pointer]
   suffix H: opaque handle

The following .emacs snippet can be used to configure Emacs accordingly
when editing files in a "/synthesis/" directory:

(add-hook 'c-mode-hook
          (lambda ()
            (let ((filename (buffer-file-name)))
              (when (and filename
                         (string-match "/synthesis/" filename))
                (setq c-basic-offset 2)
                )
              )))

(add-hook 'c++-mode-hook
          (lambda ()
            (let ((filename (buffer-file-name)))
              (when (and filename
                         (string-match "/synthesis/" filename))
                (setq c-basic-offset 2)
                )
              )))