Similar to the ASCII handling, the ESC handling can be easily moved away
from do_con_trol(). So create a new handle_esc() for that.
And add a comment with an example.
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@xxxxxxxxxx>
---
drivers/tty/vt/vt.c | 134 ++++++++++++++++++++++++--------------------
1 file changed, 72 insertions(+), 62 deletions(-)
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 7cda1a958c5e..3dddb7128234 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -2267,6 +2267,77 @@ static bool handle_ascii(struct tty_struct *tty, struct vc_data *vc, u8 c)
return false;
}
+/*
+ * Handle a character (@c) following an ESC (when @vc is in the ESesc state).
+ * E.g. previous ESC with @c == '[' here yields the ESsquare state (that is:
+ * CSI).
+ */
+static void handle_esc(struct tty_struct *tty, struct vc_data *vc, u8 c)
+{
+ vc->vc_state = ESnormal;
+ switch (c) {
+ case '[':
+ vc->vc_state = ESsquare;
+ break;
+ case ']':
+ vc->vc_state = ESnonstd;
+ break;
+ case '_':
+ vc->vc_state = ESapc;
+ break;
+ case '^':
+ vc->vc_state = ESpm;
+ break;
+ case '%':
+ vc->vc_state = ESpercent;
+ break;
+ case 'E':
+ cr(vc);
+ lf(vc);
+ break;
+ case 'M':
+ ri(vc);
+ break;
+ case 'D':
+ lf(vc);
+ break;
+ case 'H':
+ if (vc->state.x < VC_TABSTOPS_COUNT)
+ set_bit(vc->state.x, vc->vc_tab_stop);
+ break;
+ case 'P':
+ vc->vc_state = ESdcs;
+ break;
+ case 'Z':
+ respond_ID(tty);
+ break;
+ case '7':
+ save_cur(vc);
+ break;
+ case '8':
+ restore_cur(vc);
+ break;
+ case '(':
+ vc->vc_state = ESsetG0;
+ break;
+ case ')':
+ vc->vc_state = ESsetG1;
+ break;
+ case '#':
+ vc->vc_state = EShash;
+ break;
+ case 'c':
+ reset_terminal(vc, 1);
+ break;
+ case '>': /* Numeric keypad */
+ clr_kbd(vc, kbdapplic);
+ break;
+ case '=': /* Appl. keypad */
+ set_kbd(vc, kbdapplic);
+ break;
+ }
+}
+
/* console_lock is held */
static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
{
@@ -2283,68 +2354,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
switch(vc->vc_state) {
case ESesc:
- vc->vc_state = ESnormal;
- switch (c) {
- case '[':
- vc->vc_state = ESsquare;
- return;
- case ']':
- vc->vc_state = ESnonstd;
- return;
- case '_':
- vc->vc_state = ESapc;
- return;
- case '^':
- vc->vc_state = ESpm;
- return;
- case '%':
- vc->vc_state = ESpercent;
- return;
- case 'E':
- cr(vc);
- lf(vc);
- return;
- case 'M':
- ri(vc);
- return;
- case 'D':
- lf(vc);
- return;
- case 'H':
- if (vc->state.x < VC_TABSTOPS_COUNT)
- set_bit(vc->state.x, vc->vc_tab_stop);
- return;
- case 'P':
- vc->vc_state = ESdcs;
- return;
- case 'Z':
- respond_ID(tty);
- return;
- case '7':
- save_cur(vc);
- return;
- case '8':
- restore_cur(vc);
- return;
- case '(':
- vc->vc_state = ESsetG0;
- return;
- case ')':
- vc->vc_state = ESsetG1;
- return;
- case '#':
- vc->vc_state = EShash;
- return;
- case 'c':
- reset_terminal(vc, 1);
- return;
- case '>': /* Numeric keypad */
- clr_kbd(vc, kbdapplic);
- return;
- case '=': /* Appl. keypad */
- set_kbd(vc, kbdapplic);
- return;
- }
+ handle_esc(tty, vc, c);
return;
case ESnonstd:
if (c=='P') { /* palette escape sequence */
--
2.43.0
