From 86dfbda0e4a2ad2638a5beed41dc4b441857362b Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Tue, 19 Jul 2022 06:51:31 +0000
Subject: [PATCH] Process modifiers as bits rather than using a switch, from
 Koichi Murase.

---
 tty-keys.c | 38 ++++++++++----------------------------
 1 file changed, 10 insertions(+), 28 deletions(-)

diff --git a/tty-keys.c b/tty-keys.c
index 4a712d42..bb9ec231 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -934,34 +934,16 @@ tty_keys_extended_key(struct tty *tty, const char *buf, size_t len,
 		nkey = number;
 
 	/* Update the modifiers. */
-	switch (modifiers) {
-	case 2:
-		nkey |= KEYC_SHIFT;
-		break;
-	case 3:
-		nkey |= (KEYC_META|KEYC_IMPLIED_META);
-		break;
-	case 4:
-		nkey |= (KEYC_SHIFT|KEYC_META|KEYC_IMPLIED_META);
-		break;
-	case 5:
-		nkey |= KEYC_CTRL;
-		break;
-	case 6:
-		nkey |= (KEYC_SHIFT|KEYC_CTRL);
-		break;
-	case 7:
-		nkey |= (KEYC_META|KEYC_CTRL);
-		break;
-	case 8:
-		nkey |= (KEYC_SHIFT|KEYC_META|KEYC_IMPLIED_META|KEYC_CTRL);
-		break;
-	case 9:
-		nkey |= (KEYC_META|KEYC_IMPLIED_META);
-		break;
-	default:
-		*key = KEYC_NONE;
-		break;
+	if (modifiers > 0) {
+		modifiers--;
+		if (modifiers & 1)
+			nkey |= KEYC_SHIFT;
+		if (modifiers & 2)
+			nkey |= (KEYC_META|KEYC_IMPLIED_META); /* Alt */
+		if (modifiers & 4)
+			nkey |= KEYC_CTRL;
+		if (modifiers & 8)
+			nkey |= (KEYC_META|KEYC_IMPLIED_META); /* Meta */
 	}
 
 	/*