u-boot/cmd/cls.c
Simon Glass 61a6210541 video: Add a note about the broken implementation
The cls command is broken. Previous discussion about this was at [1] and
[2]. For now, add a note to the source code.

[1] https://patchwork.ozlabs.org/project/uboot/patch/
       20221022092058.106052-1-heinrich.schuchardt@canonical.com/
[2] https://patchwork.ozlabs.org/project/uboot/patch/
       20230106145243.411626-12-sjg@chromium.org/

Signed-off-by: Simon Glass <sjg@chromium.org>
2023-03-13 13:53:01 +01:00

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C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2018
* DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
*
* cls - clear screen command
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <video_console.h>
#define CSI "\x1b["
static int do_video_clear(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
__maybe_unused struct udevice *dev;
/*
* Send clear screen and home
*
* FIXME(Heinrich Schuchardt <xypron.glpk@gmx.de>): This should go
* through an API and only be written to serial terminals, not video
* displays
*/
printf(CSI "2J" CSI "1;1H");
if (IS_ENABLED(CONFIG_VIDEO_ANSI))
return 0;
if (IS_ENABLED(CONFIG_VIDEO)) {
if (uclass_first_device_err(UCLASS_VIDEO_CONSOLE, &dev))
return CMD_RET_FAILURE;
if (vidconsole_clear_and_reset(dev))
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
U_BOOT_CMD(cls, 1, 1, do_video_clear, "clear screen", "");