https://github.com/Dewdrops/visual-ascii-mode.git
git clone 'git://github.com/Dewdrops/visual-ascii-mode.git'
Visualize ASCII code on buffer.
Use melpa or just put this file in somewhere of your load-path and add this line to your .emacs:
lisp
(require 'visual-ascii-mode)
Type M-x visual-ascii-mode to enable visual-ascii-mode in current buffer.
visual-ascii-mode-show-unicode (default: nil)
Non-nil means that any integer less than (max-char) will be recognized as unicode code and be visualized.
visual-ascii-mode-display-in-comment (default: nil)
Non-nil means that also visualize ascii code inside comment or string.
visual-ascii-mode-show-unprintable-character (default: t)
This variable controls whether/how to display unprintable characters:
t means to show control characters in C-what style (which returned by single-key-description),
abbrev means to use ASCII control code abbreviation,
nil means not to display unprintable character.