Tools: Emacs

By default, emacs will use spaces to indent your C code.

Of course, you don't want that.

To tell emacs to use tabs instead, you just need to put the following lines in the file ~/.emacs (If it doesn't exist, just create it):

(setq c-default-style "k&r"
      c-basic-offset 8
      tab-width 8
      indent-tabs-mode t)

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If you want to highlight lines exceeding 80 characters and trailing whitespace, you can add this to your ~/.emacs:

(require 'whitespace)
(setq whitespace-style '(face empty lines-tail trailing))
(global-whitespace-mode t)