This patch series brings several fixes and improvements to the QEMU
virtual console (VC), making it more usable and aligning it better
with VT100 spec. The updates include support for inserting and
deleting characters, better cursor handling and correct position
reporting. Without these changes, the console is hardly usable.
1. Support for DCH (delete) and ICH (insert) commands
* Properly handles character deletion and insertion as per VT100
specs.
2. Add support for cursor save/restore (ESC 7 and ESC 8)
* Implements legacy DEC sequences for compatibility.
* Ensures cursor attributes are also saved and restored.
3. Fix cursor position reporting
* Reports cursor position relative to the screen instead of the
scroll buffer.
* Fixes issues with tools that rely on accurate cursor placement.
4. Ensure DSR (Device Status Report) responses go to applications
* Stops terminal from rendering responses to the screen but instead
send reports back to applications.
5. Handle `ESC ( <ch>` character set sequences
* Makes `top` output look clean by handling the character set
commands.
These changes improve the virtual console's compatibility with
terminal-based apps. Without them, the console is quite frustrating to
use.
v1 .. v2:
* The VT spec and ECMA-48 standard are somewhat vague about exactly
what attributes should be set for the ICH (insert character),
but various terminal implementations reset the character to the
default state. Instead of inserting a "space" with the current
attribute, call `vc_clear_xy()` for the inserted character.
Signed-off-by: Roman Penyaev <r.peni...@gmail.com>
Cc: "Marc-André Lureau" <marcandre.lur...@redhat.com>
Cc: Kevin Wolf <kw...@redhat.com>
Cc: Daniel P. Berrange <berra...@redhat.com>
Cc: qemu-devel@nongnu.org
Roman Penyaev (5):
ui/console-vc: introduce parsing of the 'ESC ( <ch>' sequence
ui/console-vc: report to the application instead of screen rendering
ui/console-vc: report cursor position in the screen not in the scroll
buffer
ui/console-vc: add support for cursor DECSC and DECRC commands
ui/console-vc: implement DCH (delete) and ICH (insert) commands
ui/console-vc.c | 154 ++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 142 insertions(+), 12 deletions(-)
--
2.43.0
