Implement IO port API

Related issue: #964

Implemented the IO API of Jerry ports. Removed log file from API level.
The port implementation should define the destination of log messages.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

targets/default/jerry-port-default-io.c

@@ -18,30 +18,30 @@
 #include "jerry-port.h"
 
 /**
- * Provide log message to filestream implementation for the engine.
+ * Provide console message implementation for the engine.
  */
-int jerry_port_logmsg (FILE *stream, /**< stream pointer */
-                       const char *format, /**< format string */
-                       ...) /**< parameters */
+void
+jerry_port_console (const char *format, /**< format string */
+                    ...) /**< parameters */
 {
   va_list args;
-  int count;
   va_start (args, format);
-  count = vfprintf (stream, format, args);
+  vfprintf (stdout, format, args);
   va_end (args);
-  return count;
-} /* jerry_port_logmsg */
+} /* jerry_port_console */
 
 /**
- * Provide error message to console implementation for the engine.
+ * Provide log message implementation for the engine.
  */
-int jerry_port_errormsg (const char *format, /**< format string */
-                         ...) /**< parameters */
+void
+jerry_port_log (jerry_log_level_t level, /**< log level */
+                const char *format, /**< format string */
+                ...)  /**< parameters */
 {
+  (void) level; /* default port implementation ignores the log level */
+
   va_list args;
-  int count;
   va_start (args, format);
-  count = vfprintf (stderr, format, args);
+  vfprintf (stderr, format, args);
   va_end (args);
-  return count;
-} /* jerry_port_errormsg */
+} /* jerry_port_log */