From 381333c4a9fd521bee8a0287e648f0c6aeb96a0b Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Sun, 12 Jan 2020 22:00:20 +0000
Subject: [PATCH] Detect iTerm2 and enable DECSLRM.

---
 tty-keys.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tty.c      |  2 +-
 2 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/tty-keys.c b/tty-keys.c
index 4644340c..5054c424 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -52,6 +52,8 @@ static int	tty_keys_clipboard(struct tty *, const char *, size_t,
 		    size_t *);
 static int	tty_keys_device_attributes(struct tty *, const char *, size_t,
 		    size_t *);
+static int	tty_keys_device_status_report(struct tty *, const char *,
+		    size_t, size_t *);
 
 /* Default raw keys. */
 struct tty_default_key_raw {
@@ -607,6 +609,17 @@ tty_keys_next(struct tty *tty)
 		goto partial_key;
 	}
 
+	/* Is this a device status report response? */
+	switch (tty_keys_device_status_report(tty, buf, len, &size)) {
+	case 0:		/* yes */
+		key = KEYC_UNKNOWN;
+		goto complete_key;
+	case -1:	/* no, or not valid */
+		break;
+	case 1:		/* partial */
+		goto partial_key;
+	}
+
 	/* Is this a mouse key press? */
 	switch (tty_keys_mouse(tty, buf, len, &size, &m)) {
 	case 0:		/* yes */
@@ -1054,3 +1067,47 @@ tty_keys_device_attributes(struct tty *tty, const char *buf, size_t len,
 	tty_set_flags(tty, flags);
 	return (0);
 }
+
+/*
+ * Handle device status report input. Returns 0 for success, -1 for failure, 1
+ * for partial.
+ */
+static int
+tty_keys_device_status_report(struct tty *tty, const char *buf, size_t len,
+    size_t *size)
+{
+	struct client	*c = tty->client;
+	u_int		 i;
+	char		 tmp[64];
+	int		 flags = 0;
+
+	*size = 0;
+
+	/* First three bytes are always \033[. */
+	if (buf[0] != '\033')
+		return (-1);
+	if (len == 1)
+		return (1);
+	if (buf[1] != '[')
+		return (-1);
+	if (len == 2)
+		return (1);
+
+	/* Copy the rest up to a 'n'. */
+	for (i = 0; i < (sizeof tmp) - 1 && buf[2 + i] != 'n'; i++) {
+		if (2 + i == len)
+			return (1);
+		tmp[i] = buf[2 + i];
+	}
+	if (i == (sizeof tmp) - 1)
+		return (-1);
+	tmp[i] = '\0';
+	*size = 3 + i;
+
+	/* Set terminal flags. */
+	if (strncmp(tmp, "ITERM2 ", 7) == 0)
+		flags |= TERM_DECSLRM;
+	log_debug("%s: received DSR %.*s", c->name, (int)*size, buf);
+	tty_set_flags(tty, flags);
+	return (0);
+}
diff --git a/tty.c b/tty.c
index c9843e90..2d4b4cc0 100644
--- a/tty.c
+++ b/tty.c
@@ -327,7 +327,7 @@ tty_start_tty(struct tty *tty)
 			tty->flags |= TTY_FOCUS;
 			tty_puts(tty, "\033[?1004h");
 		}
-		tty_puts(tty, "\033[c");
+		tty_puts(tty, "\033[c\033[1337n");
 	}
 
 	tty->flags |= TTY_STARTED;