From 9d858f5717cfc261d2ee80efff954acd7b1e5c00 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko
Date: Tue, 5 Sep 2017 19:16:40 +0200
Subject: chat: do not die when HANGUP param is missing. Closes 10016

function                                             old     new   delta
chat_main                                           1356    1379     +23

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 miscutils/chat.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'miscutils/chat.c')

diff --git a/miscutils/chat.c b/miscutils/chat.c
index 1446a04..2dfe52c 100644
--- a/miscutils/chat.c
+++ b/miscutils/chat.c
@@ -238,10 +238,18 @@ int chat_main(int argc UNUSED_PARAM, char **argv)
 			, *argv
 		);
 		if (key >= 0) {
+			bool onoff;
 			// cache directive value
 			char *arg = *++argv;
+
+			if (!arg) {
+#if ENABLE_FEATURE_CHAT_TTY_HIFI
+				tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio0);
+#endif
+				bb_show_usage();
+			}
 			// OFF -> 0, anything else -> 1
-			bool onoff = (0 != strcmp("OFF", arg));
+			onoff = (0 != strcmp("OFF", arg));
 			// process directive
 			if (DIR_HANGUP == key) {
 				// turn SIGHUP on/off
-- 
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