Use DC2 instead of ENQ for marker of TTY Resizer

common/common.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023, Yasumasa Suenaga
+ * Copyright (C) 2023, 2024, Yasumasa Suenaga
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -19,12 +19,12 @@
 #ifndef COMMON_H
 #define COMMON_H
 
-#define RESIZER_START_MARKER  '\x05'
+#define RESIZER_START_MARKER  '\x12'  // DC2
 #define RESIZER_END_MARKER    't'
 #define RESIZER_CANCEL_MARKER 'c'
 #define RESIZER_SEPARATOR     ";"
 
-/* marker (0x05) + ushort (up to 65535) + separator (;) + ushort + end marker */
+/* marker (0x12) + ushort (up to 65535) + separator (;) + ushort + end marker */
 #define RINGBUF_SZ 13
 
 #endif

tty-resizer/README.md

@@ -85,12 +85,12 @@ sudo systemctl restart tty-resizer
 Send following format command to TTY console:
 
 ```
-[0x05][Row];[Col]t
+[0x12][Row];[Col]t
 ```
 
 Both `Row` and `Col` are unsigned short.
 
-When `0x05` (ENQ) is received in tty-resizer, subsequent chars are captured in tty-resizer, and they will not propagate to real TTY. `t` is terminator, then capture mode in tty-resizer is finished, and subsequent chars are propagated to real TTY, and `TIOCSWINSZ` ioctl would be issued to the specified TTY. `c` means "cancel" for tty-resizer, then capture mode will be finished, and happens nothing.
+When `0x12` (DC2) is received in tty-resizer, subsequent chars are captured in tty-resizer, and they will not propagate to real TTY. `t` is terminator, then capture mode in tty-resizer is finished, and subsequent chars are propagated to real TTY, and `TIOCSWINSZ` ioctl would be issued to the specified TTY. `c` means "cancel" for tty-resizer, then capture mode will be finished, and happens nothing.
 
 0-9 and `;`, `t`, `c` is valid chars on capture mode. Capture mode will be aborted when other char is received - it would be treated as `c`.