From 608f8715c9aec78f8d04cc72a2a91e4f8068c9a0 Mon Sep 17 00:00:00 2001
From: nicm <nicm@openbsd.org>
Date: Wed, 7 Apr 2021 15:46:12 +0000
Subject: [PATCH] Restore previous behaviour so that C-X remains the same as
 C-x. Instead, translate incoming extended keys so that they are consistent.

---
 usr.bin/tmux/key-string.c |  7 ++++---
 usr.bin/tmux/tty-keys.c   | 36 ++++++++++++++++++++++--------------
 2 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/usr.bin/tmux/key-string.c b/usr.bin/tmux/key-string.c
index eb72dc04665..6404504b096 100644
--- a/usr.bin/tmux/key-string.c
+++ b/usr.bin/tmux/key-string.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: key-string.c,v 1.64 2021/04/07 07:30:02 nicm Exp $ */
+/* $OpenBSD: key-string.c,v 1.65 2021/04/07 15:46:12 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -239,10 +239,11 @@ key_string_lookup_string(const char *string)
 
 	/* Convert the standard control keys. */
 	if (key < KEYC_BASE && (modifiers & KEYC_CTRL) &&
-	    strchr(other, key) == NULL &&
-	    (key < 64 || key > 95)) {
+	    strchr(other, key) == NULL) {
 		if (key >= 97 && key <= 122)
 			key -= 96;
+		else if (key >= 64 && key <= 95)
+                       key -= 64;
 		else if (key == 32)
 			key = 0;
 		else if (key == 63)
diff --git a/usr.bin/tmux/tty-keys.c b/usr.bin/tmux/tty-keys.c
index d3db07ecd98..78b8090bdbf 100644
--- a/usr.bin/tmux/tty-keys.c
+++ b/usr.bin/tmux/tty-keys.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tty-keys.c,v 1.143 2021/04/07 07:30:02 nicm Exp $ */
+/* $OpenBSD: tty-keys.c,v 1.144 2021/04/07 15:46:12 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -871,6 +871,7 @@ tty_keys_extended_key(struct tty *tty, const char *buf, size_t len,
 	char		 tmp[64];
 	cc_t		 bspace;
 	key_code	 nkey;
+	key_code	 onlykey;
 
 	*size = 0;
 
@@ -948,19 +949,26 @@ tty_keys_extended_key(struct tty *tty, const char *buf, size_t len,
 		break;
 	}
 
-    /* Don't allow both KEYC_CTRL and implied. */
-	if ((nkey & KEYC_CTRL) && (nkey & KEYC_MASK_KEY) < 32)
-		nkey &= ~KEYC_CTRL;
-	if ((nkey & KEYC_MASK_MODIFIERS) == KEYC_CTRL) {
-		nkey &= KEYC_MASK_KEY;
-		if (nkey >= 97 && nkey <= 122)
-			nkey -= 96;
-		else if (nkey == 32)
-			nkey = 0;
-		else if (nkey == 63)
-			nkey = 127;
-		else
-			nkey |= KEYC_CTRL;
+	/*
+	 * Don't allow both KEYC_CTRL and as an implied modifier. Also convert
+	 * C-X into C-x and so on.
+	 */
+	if (nkey & KEYC_CTRL){
+		onlykey = (nkey & KEYC_MASK_KEY);
+		if (onlykey < 32)
+			onlykey = (nkey & ~KEYC_CTRL);
+		else {
+			if (onlykey >= 97 && onlykey <= 122)
+				onlykey -= 96;
+			else if (onlykey >= 64 && onlykey <= 95)
+				onlykey -= 64;
+			else if (onlykey == 32)
+				onlykey = 0;
+			else if (onlykey == 63)
+				onlykey = 127;
+			onlykey |= ((nkey & KEYC_MASK_MODIFIERS) & ~KEYC_CTRL);
+		}
+		nkey = onlykey;
 	}
 
 	if (log_get_level() != 0) {
-- 
2.20.1