linux-kernel - [PATCH 16/22] tty: vt: simplify ansi_control

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Date: Fri,  2 Feb 2024 07:56:02 +0100
From: "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To: gregkh@...uxfoundation.org
Cc: linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Subject: [PATCH 16/22] tty: vt: simplify ansi_control_string()

Given all the ANSI control states are sequential in the vc_ctl_state
enum, we can define first/last constants and use them in
ansi_control_string(). It makes the test simple and allows for removal
of the 'if' (which was unnecessary at all -- the 'return' should have
returned the 'if' content directly anyway).

And remove the useless comment -- it's clear from the function
prototype.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 drivers/tty/vt/vt.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 6d08290fdfdf..e1cbe966bc84 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -2107,9 +2107,11 @@ static void restore_cur(struct vc_data *vc)
  * @ESnonstd:		OSC parsed
  * @ESpalette:		OSC P parsed
  * @ESosc:		OSC [0-9] parsed
+ * @ESANSI_first:	first state for ignoring ansi control sequences
  * @ESapc:		ESC _ parsed
  * @ESpm:		ESC ^ parsed
  * @ESdcs:		ESC P parsed
+ * @ESANSI_last:	last state for ignoring ansi control sequences
  */
 enum vc_ctl_state {
 	ESnormal,
@@ -2125,9 +2127,11 @@ enum vc_ctl_state {
 	ESnonstd,
 	ESpalette,
 	ESosc,
+	ESANSI_first = ESosc,
 	ESapc,
 	ESpm,
 	ESdcs,
+	ESANSI_last = ESdcs,
 };
 
 /* console_lock is held (except via vc_init()) */
@@ -2202,12 +2206,9 @@ static void vc_setGx(struct vc_data *vc, unsigned int which, u8 c)
 		vc->vc_translate = set_translate(*charset, vc);
 }
 
-/* is this state an ANSI control string? */
-static bool ansi_control_string(unsigned int state)
+static bool ansi_control_string(enum vc_ctl_state state)
 {
-	if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
-		return true;
-	return false;
+	return state >= ESANSI_first && state <= ESANSI_last;
 }
 
 enum {
-- 
2.43.0