vt: add modifier support to cursor keys

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Generate xterm-style CSI sequences with modifier parameters for arrow
keys when Shift, Alt, or Ctrl are held. For example, Shift+Up produces
ESC [ 1 ; 2 A instead of plain ESC [ A.

The modifier encoding follows the standard xterm convention:
  mod = 1 + (shift ? 1 : 0) + (alt ? 2 : 0) + (ctrl ? 4 : 0)

When no modifiers are pressed, the original behavior is preserved.

Explicit keymap bindings for modified cursor keys (e.g., "shift keycode
103 = Find") take precedence over this automatic modifier encoding.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Link: https://patch.msgid.link/20260203045457.1049793-2-nico@fluxnic.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Nicolas Pitre 2026-02-02 23:52:46 -05:00 • committed by Greg Kroah-Hartman

parent 24728b93fa

commit 4af70f1516

1 changed files with 26 additions and 1 deletions

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drivers/tty/vt/keyboard.c

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