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ui/console-vc: add support for cursor DECSC and DECRC commands

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There are aliases for save and restore cursor commands:

* save cursor
    `ESC 7`     (DEC Save Cursor [1], older VT100)
    `ESC [ s`   (CSI Save Cursor, standard ANSI)

* load cursor
    `ESC 8`     (DEC Restore Cursor [2], older VT100)
    `ESC [ u`   (CSI Restore Cursor, standard ANSI)

This change introduces older DEC sequencies for compatibility with
some scripts (for example [3]) and tools.

This change also adds saving and restoring of character attributes,
which is according to the VT spec [1][2]

[1] https://vt100.net/docs/vt510-rm/DECSC.html
[2] https://vt100.net/docs/vt510-rm/DECRC.html
[3] https://wiki.archlinux.org/title/Working_with_the_serial_console#Resizing_a_terminal

Signed-off-by: Roman Penyaev <r.peniaev@gmail.com>
Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com>
Cc: qemu-devel@nongnu.org
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20250226075913.353676-5-r.peniaev@gmail.com>
This commit is contained in:
Roman Penyaev 2025-02-26 08:59:10 +01:00 • committed by Marc-André Lureau
parent 40339871da
commit 1a0fd7838a
1 changed files with 34 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

40
ui/console-vc.c
View file

@ -90,6 +90,7 @@ struct VCChardev {
int esc_params[MAX_ESC_PARAMS];
int nb_esc_params;
TextAttributes t_attrib; /* currently active text attributes */
TextAttributes t_attrib_saved;
int x_saved, y_saved;
};
typedef struct VCChardev VCChardev;
@ -644,6 +645,31 @@ static void vc_set_cursor(VCChardev *vc, int x, int y)
s->y = y;
}
/**
* vc_save_cursor() - saves cursor position and character attributes.
*/
static void vc_save_cursor(VCChardev *vc)
{
QemuTextConsole *s = vc->console;
vc->x_saved = s->x;
vc->y_saved = s->y;
vc->t_attrib_saved = vc->t_attrib;
}
/**
* vc_restore_cursor() - restores cursor position and character
* attributes from saved state.
*/
static void vc_restore_cursor(VCChardev *vc)
{
QemuTextConsole *s = vc->console;
s->x = vc->x_saved;
s->y = vc->y_saved;
vc->t_attrib = vc->t_attrib_saved;
}
static void vc_putchar(VCChardev *vc, int ch)
{
QemuTextConsole *s = vc->console;
@ -699,6 +725,12 @@ static void vc_putchar(VCChardev *vc, int ch)
vc->state = TTY_STATE_G0;
} else if (ch == ')') {
vc->state = TTY_STATE_G1;
} else if (ch == '7') {
vc_save_cursor(vc);
vc->state = TTY_STATE_NORM;
} else if (ch == '8') {
vc_restore_cursor(vc);
vc->state = TTY_STATE_NORM;
} else {
vc->state = TTY_STATE_NORM;
}
@ -833,14 +865,10 @@ static void vc_putchar(VCChardev *vc, int ch)
}
break;
case 's':
/* save cursor position */
vc->x_saved = s->x;
vc->y_saved = s->y;
vc_save_cursor(vc);
break;
case 'u':
/* restore cursor position */
s->x = vc->x_saved;
s->y = vc->y_saved;
vc_restore_cursor(vc);
break;
default:
trace_console_putchar_unhandled(ch);