linux-kernel - Re: [PATCH 11/45] tty: vt: define an enum for CSI+J codes

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Date: Fri, 19 Jan 2024 07:30:35 +0100
From: Jiri Slaby <jirislaby@...nel.org>
To: gregkh@...uxfoundation.org
Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/45] tty: vt: define an enum for CSI+J codes

On 18. 01. 24, 8:57, Jiri Slaby (SUSE) wrote:
> Decrypt the constant values by proper enum names. This time in csi_J().

And there are more calls of csi_J(). All those should now use the enum 
constants. v2 will fix this.

> Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
> ---
>   drivers/tty/vt/vt.c | 15 +++++++++++----
>   1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index 66ebc90a9fe9..4f7831f81db6 100644
> --- a/drivers/tty/vt/vt.c
> +++ b/drivers/tty/vt/vt.c
> @@ -1498,13 +1498,20 @@ static inline void del(struct vc_data *vc)
>   	/* ignored */
>   }
>   
> +enum {
> +	CSI_J_CURSOR_TO_END	= 0,
> +	CSI_J_START_TO_CURSOR	= 1,
> +	CSI_J_VISIBLE		= 2,
> +	CSI_J_FULL		= 3,
> +};
> +
>   static void csi_J(struct vc_data *vc, int vpar)
>   {
>   	unsigned int count;
>   	unsigned short * start;
>   
>   	switch (vpar) {
> -		case 0:	/* erase from cursor to end of display */
> +		case CSI_J_CURSOR_TO_END:
>   			vc_uniscr_clear_line(vc, vc->state.x,
>   					     vc->vc_cols - vc->state.x);
>   			vc_uniscr_clear_lines(vc, vc->state.y + 1,
> @@ -1512,16 +1519,16 @@ static void csi_J(struct vc_data *vc, int vpar)
>   			count = (vc->vc_scr_end - vc->vc_pos) >> 1;
>   			start = (unsigned short *)vc->vc_pos;
>   			break;
> -		case 1:	/* erase from start to cursor */
> +		case CSI_J_START_TO_CURSOR:
>   			vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
>   			vc_uniscr_clear_lines(vc, 0, vc->state.y);
>   			count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
>   			start = (unsigned short *)vc->vc_origin;
>   			break;
> -		case 3: /* include scrollback */
> +		case CSI_J_FULL:
>   			flush_scrollback(vc);
>   			fallthrough;
> -		case 2: /* erase whole display */
> +		case CSI_J_VISIBLE:
>   			vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
>   			count = vc->vc_cols * vc->vc_rows;
>   			start = (unsigned short *)vc->vc_origin;

-- 
js
suse labs