Add print_help function to nuttx-stm32f4 target (#1584)

JerryScript-DCO-1.0-Signed-off-by: Robert Sipka rsipka.uszeged@partner.samsung.com

targets/nuttx-stm32f4/jerry_main.c

@@ -32,6 +32,23 @@
 #define JERRY_STANDALONE_EXIT_CODE_OK   (0)
 #define JERRY_STANDALONE_EXIT_CODE_FAIL (1)
 
+/**
+ * Print usage and available options
+ */
+static void
+print_help (char *name)
+{
+  jerry_port_console ("Usage: %s [OPTION]... [FILE]...\n"
+                      "\n"
+                      "Options:\n"
+                      "  --mem-stats\n"
+                      "  --mem-stats-separate\n"
+                      "  --show-opcodes\n"
+                      "  --log-level [0-3]\n"
+                      "\n",
+                      name);
+} /* print_help */
+
 /**
  * Read source files.
  *
@@ -187,7 +204,12 @@ int jerry_main (int argc, char *argv[])
 
   for (i = 1; i < argc; i++)
   {
-    if (!strcmp ("--mem-stats", argv[i]))
+    if (!strcmp ("-h", argv[i]) || !strcmp ("--help", argv[i]))
+    {
+      print_help (argv[0]);
+      return JERRY_STANDALONE_EXIT_CODE_OK;
+    }
+    else if (!strcmp ("--mem-stats", argv[i]))
     {
       flags |= JERRY_INIT_MEM_STATS;
     }