Add common function to give hotkey help

* Key to dial and hangup
* Key to display wave form

src/amps/main.c

@@ -89,6 +89,7 @@ void print_help(const char *arg0)
 	printf("        Be more tolerant when hunting for sync sequence\n");
 	printf("\nstation-id: Give 10 digit station-id, you don't need to enter it for every\n");
 	printf("        start of this program.\n");
+	print_hotkeys_common();
 }
 
 static int handle_options(int argc, char **argv)

src/anetz/main.c

@@ -54,6 +54,7 @@ void print_help(const char *arg0)
 	printf("        percent. (disabled by default)\n");
 	printf("\nstation-id: Give (last) 5 digits of station-id, you don't need to enter it\n");
 	printf("        for every start of this program.\n");
+	print_hotkeys_common();
 }
 
 static int handle_options(int argc, char **argv)

src/bnetz/main.c

@@ -69,6 +69,7 @@ void print_help(const char *arg0)
 	printf("        percent. (disabled by default)\n");
 	printf("\nstation-id: Give 5 digit station-id, you don't need to enter it for every\n");
 	printf("        start of this program.\n");
+	print_hotkeys_common();
 }
 
 static int handle_options(int argc, char **argv)

src/cnetz/main.c

@@ -83,7 +83,8 @@ void print_help(const char *arg0)
 	printf("	This option raises audio level on TX and lowers on RX.\n");
 	printf("\nstation-id: Give 7 digit station-id, you don't need to enter it for every\n");
 	printf("        start of this program.\n");
-	printf("\nPress 'i' key for dumping currently attached subscribers.\n");
+	print_hotkeys_common();
+	printf("Press 'i' key to dump list of currently attached subscribers.\n");
 }
 
 static int handle_options(int argc, char **argv)

src/common/main.h

@@ -21,6 +21,7 @@ extern const char *read_rx_wave;
 
 void print_help(const char *arg0);
 void print_help_common(const char *arg0, const char *ext_usage);
+void print_hotkeys_common(void);
 extern struct option *long_options;
 extern char *optstring;
 void set_options_common(const char *optstring_special, struct option *long_options_special);

src/common/main_common.c

@@ -112,6 +112,14 @@ void print_help_common(const char *arg0, const char *ext_usage)
 	printf("        Replace received audio by given wav audio file.\n");
 }
 
+void print_hotkeys_common(void)
+{
+	printf("\n");
+	printf("Press digits '0'..'9' and then 'd' key to dial towards mobile station\n");
+	printf("Press 'h' key to hangup.\n");
+	printf("Press 'w' key to toggle display of wave form of RX signal.\n");
+}
+
 #define	OPT_CHANNEL		1000
 #define	OPT_WRITE_RX_WAVE	1001
 #define	OPT_WRITE_TX_WAVE	1002

src/nmt/main.c

@@ -83,6 +83,7 @@ void print_help(const char *arg0)
 	printf("        If set, the caller ID is sent while ringing the phone. (default = '%d')\n", send_callerid);
 	printf("\nstation-id: Give 7 digits of station-id, you don't need to enter it\n");
 	printf("        for every start of this program.\n");
+	print_hotkeys_common();
 }
 
 static int handle_options(int argc, char **argv)