Do not use evbuffer_add_buffer because it is destructive and doesn't

work in newer libevent.

control-notify.c

@@ -28,19 +28,14 @@
 
 void
 control_notify_input(struct client *c, struct window_pane *wp,
-    struct evbuffer *input)
+    const u_char *buf, size_t len)
 {
-	u_char		*buf;
-	size_t		 len;
 	struct evbuffer *message;
 	u_int		 i;
 
 	if (c->session == NULL)
 	    return;
 
-	buf = EVBUFFER_DATA(input);
-	len = EVBUFFER_LENGTH(input);
-
 	/*
 	 * Only write input if the window pane is linked to a window belonging
 	 * to the client's session.

input.c

@@ -873,19 +873,28 @@ input_set_state(struct window_pane *wp, const struct input_transition *itr)
 /* Parse input. */
 void
 input_parse(struct window_pane *wp)
+{
+	struct evbuffer		*evb = wp->event->input;
+
+	input_parse_buffer(wp, EVBUFFER_DATA(evb), EVBUFFER_LENGTH(evb));
+	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
+}
+
+/* Parse given input. */
+void
+input_parse_buffer(struct window_pane *wp, u_char *buf, size_t len)
 {
 	struct input_ctx		*ictx = wp->ictx;
 	struct screen_write_ctx		*sctx = &ictx->ctx;
 	const struct input_transition	*itr;
-	struct evbuffer			*evb = wp->event->input;
-	u_char				*buf;
-	size_t				 len, off;
+	size_t				 off = 0;
 
-	if (EVBUFFER_LENGTH(evb) == 0)
+	if (len == 0)
 		return;
 
 	window_update_activity(wp->window);
 	wp->flags |= PANE_CHANGED;
+	notify_input(wp, buf, len);
 
 	/*
 	 * Open the screen. Use NULL wp if there is a mode set as don't want to
@@ -897,12 +906,6 @@ input_parse(struct window_pane *wp)
 		screen_write_start(sctx, NULL, &wp->base);
 	ictx->wp = wp;
 
-	buf = EVBUFFER_DATA(evb);
-	len = EVBUFFER_LENGTH(evb);
-	off = 0;
-
-	notify_input(wp, evb);
-
 	log_debug("%s: %%%u %s, %zu bytes: %.*s", __func__, wp->id,
 	    ictx->state->name, len, (int)len, buf);
 
@@ -950,8 +953,6 @@ input_parse(struct window_pane *wp)
 
 	/* Close the screen. */
 	screen_write_stop(sctx);
-
-	evbuffer_drain(evb, len);
 }
 
 /* Split the parameter list (if any). */

notify.c

@@ -199,13 +199,13 @@ notify_hook(struct cmdq_item *item, const char *name)
 }
 
 void
-notify_input(struct window_pane *wp, struct evbuffer *input)
+notify_input(struct window_pane *wp, const u_char *buf, size_t len)
 {
 	struct client	*c;
 
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->flags & CLIENT_CONTROL)
-			control_notify_input(c, wp, input);
+			control_notify_input(c, wp, buf, len);
 	}
 }
 

tmux.h

@@ -1699,7 +1699,7 @@ char		*format_trim_right(const char *, u_int);
 
 /* notify.c */
 void	notify_hook(struct cmdq_item *, const char *);
-void	notify_input(struct window_pane *, struct evbuffer *);
+void	notify_input(struct window_pane *, const u_char *, size_t);
 void	notify_client(const char *, struct client *);
 void	notify_session(const char *, struct session *);
 void	notify_winlink(const char *, struct winlink *);
@@ -2087,6 +2087,7 @@ void	 input_free(struct window_pane *);
 void	 input_reset(struct window_pane *, int);
 struct evbuffer *input_pending(struct window_pane *);
 void	 input_parse(struct window_pane *);
+void	 input_parse_buffer(struct window_pane *, u_char *, size_t);
 
 /* input-key.c */
 void	 input_key(struct window_pane *, key_code, struct mouse_event *);
@@ -2428,7 +2429,7 @@ void	control_write_buffer(struct client *, struct evbuffer *);
 
 /* control-notify.c */
 void	control_notify_input(struct client *, struct window_pane *,
-	    struct evbuffer *);
+	    const u_char *, size_t);
 void	control_notify_pane_mode_changed(int);
 void	control_notify_window_layout_changed(struct window *);
 void	control_notify_window_pane_changed(struct window *);

window.c

@@ -1477,6 +1477,9 @@ window_pane_input_callback(struct client *c, int closed, void *data)
 {
 	struct window_pane_input_data	*cdata = data;
 	struct window_pane		*wp;
+	struct evbuffer			*evb = c->stdin_data;
+	u_char				*buf = EVBUFFER_DATA(evb);
+	size_t				 len = EVBUFFER_LENGTH(evb);
 
 	wp = window_pane_find_by_id(cdata->wp);
 	if (wp == NULL || closed || c->flags & CLIENT_DEAD) {
@@ -1489,9 +1492,8 @@ window_pane_input_callback(struct client *c, int closed, void *data)
 		return;
 	}
 
-	if (evbuffer_add_buffer(wp->event->input, c->stdin_data) != 0)
-		evbuffer_drain(c->stdin_data, EVBUFFER_LENGTH(c->stdin_data));
-	input_parse(wp);
+	input_parse_buffer(wp, buf, len);
+	evbuffer_drain(evb, len);
 }
 
 int