diff --git a/moo/kernel/test-003.moo b/moo/kernel/test-003.moo
index 716e3a9..072b956 100644
--- a/moo/kernel/test-003.moo
+++ b/moo/kernel/test-003.moo
@@ -227,7 +227,7 @@ EXCEPTION_TEST:
 Exception signal: 'experiment with exception signalling'.
 
 		// TODO: 
-		String format("%s", " 나	는\\\"") dump.
+		System logNl: String format("%s", " 나	는\\\"").
 		#"a b\nc" dump.
 	}
 }
diff --git a/moo/lib/moo-std.h b/moo/lib/moo-std.h
index cb4ff03..2e834f4 100644
--- a/moo/lib/moo-std.h
+++ b/moo/lib/moo-std.h
@@ -128,7 +128,7 @@ MOO_EXPORT int moo_compilefileu (
 
 #endif
 
-MOO_EXPORT int moo_invokestdb (
+MOO_EXPORT int moo_invokebynameb (
 	moo_t*           moo,
 	const moo_bch_t* objname,
 	const moo_bch_t* mthname
diff --git a/moo/lib/moo-utl.h b/moo/lib/moo-utl.h
index aeb36ff..3d3ea44 100644
--- a/moo/lib/moo-utl.h
+++ b/moo/lib/moo-utl.h
@@ -557,10 +557,20 @@ MOO_EXPORT moo_oow_t moo_count_ucstr (
 	const moo_uch_t* str
 );
 
+MOO_EXPORT moo_oow_t moo_count_ucstrl (
+	const moo_uch_t* str,
+	moo_oow_t        maxlen
+);
+
 MOO_EXPORT moo_oow_t moo_count_bcstr (
 	const moo_bch_t* str
 );
 
+MOO_EXPORT moo_oow_t moo_count_bcstrl (
+	const moo_bch_t* str,
+	moo_oow_t        maxlen
+);
+
 #if defined(MOO_OOCH_IS_UCH)
 #	define moo_equal_oochars(str1,str2,len) moo_equal_uchars(str1,str2,len)
 #	define moo_comp_oochars(str1,len1,str2,len2) moo_comp_uchars(str1,len1,str2,len2)
diff --git a/moo/lib/std.c b/moo/lib/std.c
index ff36907..050cd65 100644
--- a/moo/lib/std.c
+++ b/moo/lib/std.c
@@ -31,7 +31,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#if !defined(__DOS__) && defined(HAVE_PTHREAD) && defined(HAVE_STRERROR_R)
+#if !defined(__DOS__) && !defined(EMSCRIPTEN) && defined(HAVE_PTHREAD) && defined(HAVE_STRERROR_R)
 #	define USE_THREAD
 #endif
 
@@ -822,6 +822,27 @@ static void free_heap (moo_t* moo, void* ptr)
 
 static int write_all (int fd, const moo_bch_t* ptr, moo_oow_t len)
 {
+#if defined(EMSCRIPTEN)
+	while (len > 0)
+	{
+		moo_oow_t slen;
+
+		/* if the output data contains a null byte in the middle,
+		 * UTF8ToString() cuts short before printing all data */
+		slen = moo_count_bcstrl(ptr, len); 
+
+		EM_ASM_ ({
+			console.log ("%s", UTF8ToString($0, $1));
+		}, ptr, slen);
+
+		if (slen < len) slen++; /* skip the null byte */
+
+		len -= slen;
+		ptr += slen;
+
+	}
+
+#else
 	while (len > 0)
 	{
 		moo_ooi_t wr;
@@ -850,6 +871,7 @@ static int write_all (int fd, const moo_bch_t* ptr, moo_oow_t len)
 		ptr += wr;
 		len -= wr;
 	}
+#endif
 
 	return 0;
 }
@@ -926,7 +948,9 @@ static void log_write (moo_t* moo, moo_bitmask_t mask, const moo_ooch_t* msg, mo
 	else
 	{
 		logfd = xtn->log.fd;
+#if !defined(EMSCRIPTEN)
 		if (logfd <= -1) return;
+#endif
 	}
 
 /* TODO: beautify the log message.
@@ -4185,6 +4209,12 @@ moo_t* moo_openstd (moo_oow_t xtnsize, const moo_cfgstd_t* cfg, moo_errinf_t* er
 	evtcb.halting = halting_moo;
 	moo_regevtcb (moo, &evtcb);
 
+#if defined(EMSCRIPTEN)
+{
+moo_bitmask_t m = ~(moo_bitmask_t)0;
+moo_setoption (moo, MOO_OPTION_LOG_MASK, &m);
+}
+#endif
 	{
 		moo_bitmask_t bm = 0;
 
@@ -4266,7 +4296,7 @@ int moo_compilefileu (moo_t* moo, const moo_uch_t* path)
 
 #endif
 
-int moo_invokestdb (moo_t* moo, const moo_bch_t* objname, const moo_bch_t* mthname)
+int moo_invokebynameb (moo_t* moo, const moo_bch_t* objname, const moo_bch_t* mthname)
 {
 #if defined(MOO_OOCH_IS_UCH)
 	int n = -1;
diff --git a/moo/lib/utl.c b/moo/lib/utl.c
index 9a988c6..d578a4e 100644
--- a/moo/lib/utl.c
+++ b/moo/lib/utl.c
@@ -315,6 +315,16 @@ moo_oow_t moo_count_ucstr (const moo_uch_t* str)
 	return ptr - str;
 }
 
+moo_oow_t moo_count_ucstrl (const moo_uch_t* str, moo_oow_t maxlen)
+{
+	moo_oow_t i;
+	for (i = 0; i < maxlen; i++)
+	{
+		if (str[i] == '\0') break;
+	}
+	return i;
+}
+
 moo_oow_t moo_count_bcstr (const moo_bch_t* str)
 {
 	const moo_bch_t* ptr = str;
@@ -322,6 +332,16 @@ moo_oow_t moo_count_bcstr (const moo_bch_t* str)
 	return ptr - str;
 }
 
+moo_oow_t moo_count_bcstrl (const moo_bch_t* str, moo_oow_t maxlen)
+{
+	moo_oow_t i;
+	for (i = 0; i < maxlen; i++)
+	{
+		if (str[i] == '\0') break;
+	}
+	return i;
+}
+
 moo_uch_t* moo_find_uchar (const moo_uch_t* ptr, moo_oow_t len, moo_uch_t c)
 {
 	const moo_uch_t* end;
diff --git a/moo/wasm/moo.worker.js b/moo/wasm/moo.worker.js
index 2b246d5..3984982 100644
--- a/moo/wasm/moo.worker.js
+++ b/moo/wasm/moo.worker.js
@@ -13,11 +13,15 @@ const libmoo = {
 	ignite: Module.cwrap('moo_ignite', 'number', ['number', 'number']),
 	initdbgi: Module.cwrap('moo_initdbgi', 'number', ['number', 'number']),
 	compilefile: Module.cwrap('moo_compilefileb', 'number', ['number', 'string']),
-	invoke: Module.cwrap('moo_invokestdb', 'number', ['number', 'string', 'string'])
-
-
+	invoke: Module.cwrap('moo_invokebynameb', 'number', ['number', 'string', 'string'])
 };
 
+/*
+var log_write = Module.addFunction(function() {
+
+});
+*/
+
 //console.log ("QQ %O\n", self);
 
 //self.onmessage = function (evt) {
@@ -44,7 +48,7 @@ self.addEventListener ('message', function (evt) {
 			tmp = libmoo.initdbgi(moo, 102400);
 			msg = msg.concat(" initdgbi - " + tmp);
 
-			tmp = libmoo.compilefile(moo, "kernel/test-001.moo");
+			tmp = libmoo.compilefile(moo, "kernel/test-003.moo");
 			msg = msg.concat(" compilefile - " + tmp);
 
 			tmp = libmoo.invoke(moo, "MyObject", "main");