[U-Boot] common: cli_readline: Improve command line editing

[Tom Rini]

On Wed, Jun 08, 2016 at 01:49:46PM +0100, James Byrne wrote:

> This improves the cread_line() function so that it will correctly
> process the 'Home', 'End', 'Delete' and arrow key escape sequences
> produced by various terminal emulators. This makes command line editing
> a more pleasant experience.
> 
> The previous code only supported the cursor keys and the 'Home' key, and
> only for certain terminal emulator configurations. This adds support for
> the 'End and 'Delete' keys, and recognises a wider range of escape
> sequences. For example, the left arrow key can be 'ESC O D' instead of
> 'ESC [ D', and the 'Home' key can be 'ESC [ H', 'ESC O H', 'ESC 1 ~' or
> 'ESC 7 ~', depending on what terminal emulator you use and how it is
> configured.
> 
> Signed-off-by: James Byrne <james.byrne at origamienergy.com>

This introduces a new warning:
common/cli_readline.c: In function ‘cli_readline_into_buffer’:
common/cli_readline.c:361:4: warning: ‘act’ may be used uninitialized in this function [-Wmaybe-uninitialized]

-- 
Tom
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