nshlib: Make nsh_telnetmain() in public

Summary:
- This commit makes nsh_telnetmain() in public so that we can
  call it from applications.
- Also, CONFIG_NSH_DISABLE_TELNETSTART is introduced so that
  we can disable nsh_telnetstart()

Impact:
- nsh with telnet daemon

Testing:
- Tested with sabre-6quad:netknsh (will be updated later)

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

include/nshlib/nshlib.h

@@ -126,6 +126,27 @@ void nsh_initialize(void);
 
 int nsh_consolemain(int argc, FAR char *argv[]);
 
+/****************************************************************************
+ * Name: nsh_telnetmain
+ *
+ * Description:
+ *   This interface may be called or started with task_start to start a
+ *   single NSH instance that operates on stdin and stdout for telnet daemon.
+ *   This function does not return.
+ *
+ * Input Parameters:
+ *   Standard task start-up arguments.  These are not used.  argc may be
+ *   zero and argv may be NULL.
+ *
+ * Returned Values:
+ *   This function does not normally return.  exit() is usually called to
+ *   terminate the NSH session.  This function will return in the event of
+ *   an error.  In that case, a non-zero value is returned (EXIT_FAILURE=1).
+
+ ****************************************************************************/
+
+int nsh_telnetmain(int argc, FAR char *argv[]);
+
 /****************************************************************************
  * Name: nsh_telnetstart
  *

nshlib/Kconfig

@@ -1157,6 +1157,12 @@ config NSH_IOBUFFER_SIZE
 		Determines the size of the I/O buffer to use for sending/
 		receiving TELNET commands/responses.  Default: 512
 
+config NSH_DISABLE_TELNETSTART
+	bool "Disable to start telnetd"
+	default false
+	---help---
+		Determines if the nsh starts telnetd automatically
+
 endif # NSH_TELNET
 endmenu # Telnet Configuration
 

nshlib/nsh_telnetd.c

@@ -59,14 +59,14 @@ enum telnetd_state_e
 };
 
 /****************************************************************************
- * Private Functions
+ * Public Functions
  ****************************************************************************/
 
 /****************************************************************************
  * Name: nsh_telnetmain
  ****************************************************************************/
 
-static int nsh_telnetmain(int argc, char *argv[])
+int nsh_telnetmain(int argc, FAR char *argv[])
 {
   FAR struct console_stdio_s *pstate = nsh_newconsole(true);
   FAR struct nsh_vtbl_s *vtbl;
@@ -192,10 +192,6 @@ static int nsh_telnetmain(int argc, char *argv[])
   return OK;
 }
 
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
 /****************************************************************************
  * Name: nsh_telnetstart
  *
@@ -218,6 +214,7 @@ static int nsh_telnetmain(int argc, char *argv[])
  *
  ****************************************************************************/
 
+#ifndef CONFIG_NSH_DISABLE_TELNETSTART
 int nsh_telnetstart(sa_family_t family)
 {
   static enum telnetd_state_e state = TELNETD_NOTRUNNING;
@@ -325,6 +322,7 @@ int nsh_telnetstart(sa_family_t family)
 
   return ret;
 }
+#endif
 
 /****************************************************************************
  * Name: cmd_telnetd