[U-Boot] [PATCH 04/14] Fix function readline in main.c

[Marek Vasut <marek.vasut@gmail.com>]

>  * Ignore ANSI escape codes for moving cursor, which are generated by
> keyboard

I think WD should comment on this one.

> 
> Signed-off-by: Pali Roh?r <pali.rohar@gmail.com>
> ---
> Changes since original version:
>    - Fixed commit message
> 
>  common/main.c |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 51 insertions(+), 0 deletions(-)
> 
> diff --git a/common/main.c b/common/main.c
> index e96c95a..e7b5516 100644
> --- a/common/main.c
> +++ b/common/main.c
> @@ -958,6 +958,7 @@ int readline_into_buffer (const char *const prompt,
> char * buffer) int	n = 0;				/* buffer index		
*/
>  	int	plen = 0;			/* prompt length	*/
>  	int	col;				/* output column cnt	*/
> +	int	esc = 0;			/* ansi escape char	*/
>  	char	c;
> 
>  	/* print prompt */
> @@ -1024,7 +1025,57 @@ int readline_into_buffer (const char *const prompt,
> char * buffer) p=delete_char(p_buf, p, &col, &n, plen);
>  			continue;
> 
> +		case '\e':			/* ANSI escape char	*/
> +			esc = 1;
> +			continue;
> +
>  		default:
> +
> +			/*
> +			 * Check for ANSI escape chars
> +			 */
> +			if (esc == 0 && c == '\e') {
> +				esc = 1;
> +				continue;
> +			} else if (esc == 1) {
> +				if (c == '[') {
> +					esc = 2;
> +					continue;
> +				}
> +				if (n < CONFIG_SYS_CBSIZE-2) {
> +					++n;
> +					*p++ = '\e';
> +					putc('\e');
> +				}
> +				esc = 0;
> +			} else if (esc == 2 || esc == 3) {
> +				if (esc == 2 && c == '1') {
> +					esc = 3;
> +					continue;
> +				}
> +				/* Ignore ANSI escape sequences */
> +				/* generated by keyboard */
> +				/* \e [ 1 A-D and \e [ A-D */
> +				if (c >= 'A' && c <= 'D') {
> +					esc = 0;
> +					continue;
> +				}
> +				if (esc == 2 && n < CONFIG_SYS_CBSIZE-3) {
> +					n += 2;
> +					*p++ = '\e';
> +					*p++ = '[';
> +					puts("\e[");
> +				} else if (esc == 3 &&
> +						n < CONFIG_SYS_CBSIZE-4) {
> +					n += 3;
> +					*p++ = '\e';
> +					*p++ = '[';
> +					*p++ = '1';
> +					puts("\e[1");
> +				}
> +				esc = 0;
> +			}
> +
>  			/*
>  			 * Must be a normal character then
>  			 */