diff --git a/Makefile.in b/Makefile.in
index 39b7e92..9608650 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -166,8 +166,8 @@ am__DIST_COMMON = $(srcdir)/Makefile.in $(top_srcdir)/ac/ar-lib \
 	$(top_srcdir)/ac/compile $(top_srcdir)/ac/config.guess \
 	$(top_srcdir)/ac/config.sub $(top_srcdir)/ac/install-sh \
 	$(top_srcdir)/ac/ltmain.sh $(top_srcdir)/ac/missing ac/ar-lib \
-	ac/compile ac/config.guess ac/config.sub ac/install-sh \
-	ac/ltmain.sh ac/missing
+	ac/compile ac/config.guess ac/config.sub ac/depcomp \
+	ac/install-sh ac/ltmain.sh ac/missing
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
diff --git a/bin/Makefile.am b/bin/Makefile.am
index 4ec1fc2..1a66565 100644
--- a/bin/Makefile.am
+++ b/bin/Makefile.am
@@ -30,7 +30,7 @@ hcl_LDFLAGS = $(LDFLAGS_ALL_COMMON)
 hcl_LDADD = $(LIBADD_LIB_COMMON) -lhcl
 hcl_DEPENDENCIES = ../lib/libhcl.la
 
-if ENABLE_HCLEX
+if ENABLE_HCLX
 
 ## cb-impl.c is included in libhclx.
 ## so ../lib/cb-impl.h and ../lib/cb-impl.c are not listed as sources
diff --git a/bin/main.c b/bin/main.c
index 1a3ac71..7fc219f 100644
--- a/bin/main.c
+++ b/bin/main.c
@@ -1150,6 +1150,7 @@ int main (int argc, char* argv[])
 	 * -- instead of returning -1 immediately. --*/
 	set_signal (SIGINT, handle_sigint);
 
+hcl_prbfmt (hcl, "this is good %s %10hs %hs\n", "whole new world. 1234567890 from this point onward, any failure leasd to jumping to oops label",  "as이거 좋은거잖아dkfjsdakfjsadklfjasd", "1111");
 	while (1)
 	{
 		hcl_oop_t obj;
diff --git a/configure b/configure
index 9f6d398..6f0fa69 100755
--- a/configure
+++ b/configure
@@ -651,8 +651,8 @@ HCL_SIZEOF_LONG_LONG
 HCL_SIZEOF_CHAR32_T
 HCL_SIZEOF_CHAR16_T
 HCL_SIZEOF_WCHAR_T
-ENABLE_HCLEX_FALSE
-ENABLE_HCLEX_TRUE
+ENABLE_HCLX_FALSE
+ENABLE_HCLX_TRUE
 ENABLE_LIBUNWIND_FALSE
 ENABLE_LIBUNWIND_TRUE
 ENABLE_LIBLTDL_FALSE
@@ -824,7 +824,7 @@ enable_dynamic_module
 enable_static_module
 enable_libltdl
 enable_libunwind
-enable_hclex
+enable_hclx
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1482,7 +1482,7 @@ Optional Features:
                           library(default. no)
   --enable-libltdl        use libltdl(default. no)
   --enable-libunwind      use libunwind(default. no)
-  --enable-hclex          build libhclex(default. no)
+  --enable-hclx           build libhclx(default. no)
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -21256,20 +21256,20 @@ else
 fi
 
 
-# Check whether --enable-hclex was given.
-if test "${enable_hclex+set}" = set; then :
-  enableval=$enable_hclex; enable_hclex_is=$enableval
+# Check whether --enable-hclx was given.
+if test "${enable_hclx+set}" = set; then :
+  enableval=$enable_hclx; enable_hclx_is=$enableval
 else
-  enable_hclex_is=no
+  enable_hclx_is=no
 
 fi
 
- if test "x${enable_hclex_is}" = "xyes"; then
-  ENABLE_HCLEX_TRUE=
-  ENABLE_HCLEX_FALSE='#'
+ if test "x${enable_hclx_is}" = "xyes"; then
+  ENABLE_HCLX_TRUE=
+  ENABLE_HCLX_FALSE='#'
 else
-  ENABLE_HCLEX_TRUE='#'
-  ENABLE_HCLEX_FALSE=
+  ENABLE_HCLX_TRUE='#'
+  ENABLE_HCLX_FALSE=
 fi
 
 
@@ -21479,8 +21479,8 @@ if test -z "${ENABLE_LIBUNWIND_TRUE}" && test -z "${ENABLE_LIBUNWIND_FALSE}"; th
   as_fn_error $? "conditional \"ENABLE_LIBUNWIND\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
-if test -z "${ENABLE_HCLEX_TRUE}" && test -z "${ENABLE_HCLEX_FALSE}"; then
-  as_fn_error $? "conditional \"ENABLE_HCLEX\" was never defined.
+if test -z "${ENABLE_HCLX_TRUE}" && test -z "${ENABLE_HCLX_FALSE}"; then
+  as_fn_error $? "conditional \"ENABLE_HCLX\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
 
diff --git a/configure.ac b/configure.ac
index 6f6cee5..0423dee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -693,13 +693,13 @@ then
 fi
 AM_CONDITIONAL(ENABLE_LIBUNWIND, test "x${enable_libunwind_is}" = "xyes")
 
-dnl ===== enable-hclex =====
-AC_ARG_ENABLE([hclex],
-	[AS_HELP_STRING([--enable-hclex],[build libhclex(default. no)])],
-	enable_hclex_is=$enableval,
-	enable_hclex_is=no
+dnl ===== enable-hclx =====
+AC_ARG_ENABLE([hclx],
+	[AS_HELP_STRING([--enable-hclx],[build libhclx(default. no)])],
+	enable_hclx_is=$enableval,
+	enable_hclx_is=no
 )
-AM_CONDITIONAL(ENABLE_HCLEX, test "x${enable_hclex_is}" = "xyes")
+AM_CONDITIONAL(ENABLE_HCLX, test "x${enable_hclx_is}" = "xyes")
 
 AC_SUBST(HCL_SIZEOF_WCHAR_T, $ac_cv_sizeof_wchar_t)
 AC_SUBST(HCL_SIZEOF_CHAR16_T, $ac_cv_sizeof_char16_t)
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 4fa1e0c..c54fe6a 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -101,7 +101,7 @@ libhcl_la_LIBADD += -lhcl-sys
 libhcl_la_DEPENDENCIES += $(abs_builddir)/../mod/libhcl-sys.la
 endif
 
-if ENABLE_HCLEX
+if ENABLE_HCLX
 pkglib_LTLIBRARIES += libhclx.la
 pkginclude_HEADERS += hcl-c.h hcl-s.h hcl-tmr.h hcl-xutl.h hcl-json.h
 libhclx_la_SOURCES = \
diff --git a/lib/fmt.c b/lib/fmt.c
index a1b66ed..1ebfc5c 100644
--- a/lib/fmt.c
+++ b/lib/fmt.c
@@ -1646,9 +1646,6 @@ static int print_bcs (hcl_fmtout_t* fmtout, const hcl_bch_t* ptr, hcl_oow_t len)
 		ucslen = HCL_COUNTOF(ucsbuf);
 		hcl_conv_bchars_to_uchars_with_cmgr(ptr, &bcslen, ucsbuf, &ucslen, hcl->cmgr, 1);
 
-		hcl->c->outarg.ptr = ucsbuf;
-		hcl->c->outarg.len = ucslen;
-
 		ucsptr = ucsbuf;
 		while (ucslen > 0)
 		{
@@ -1690,9 +1687,11 @@ static int print_bcs (hcl_fmtout_t* fmtout, const hcl_bch_t* ptr, hcl_oow_t len)
 static int print_ucs (hcl_fmtout_t* fmtout, const hcl_uch_t* ptr, hcl_oow_t len)
 {
 	hcl_t* hcl = (hcl_t*)fmtout->ctx;
-	hcl_uch_t* optr;
+	
 
 #if defined(HCL_OOCH_IS_UCH)
+	hcl_uch_t* optr;
+
 	optr = (hcl_uch_t*)ptr;
 	while (len > 0)
 	{
@@ -1707,17 +1706,41 @@ static int print_ucs (hcl_fmtout_t* fmtout, const hcl_uch_t* ptr, hcl_oow_t len)
 		len -= hcl->c->outarg.xlen;
 	}
 #else
-	/* TODO: */
+	hcl_oow_t bcslen, ucslen;
+	hcl_ooch_t bcsbuf[64], * bcsptr;
+
+	while (len > 0)
+	{
+		ucslen = len;
+		bcslen = HCL_COUNTOF(bcsbuf);
+		hcl_conv_uchars_to_bchars_with_cmgr(ptr, &ucslen, bcsbuf, &bcslen, hcl->cmgr);
+
+		bcsptr = bcsbuf;
+		while (ucslen > 0)
+		{
+			hcl->c->outarg.ptr = bcsptr;
+			hcl->c->outarg.len = bcslen;
+
+			if (hcl->c->printer(hcl, HCL_IO_WRITE, &hcl->c->outarg) <= -1) return -1;
+			if (hcl->c->outarg.xlen <= 0) return 0; /* end of stream. but not failure */
+
+			HCL_ASSERT (hcl, hcl->c->outarg.xlen <= len);
+			bcsptr += hcl->c->outarg.xlen;
+			bcslen -= hcl->c->outarg.xlen;
+		}
+
+		ptr += ucslen;
+		len -= ucslen;
+	}
 #endif
 
 	return 1; /* success */
 }
 
 
-hcl_ooi_t hcl_prbfmt (hcl_t* hcl, const hcl_bch_t* fmt, ...)
+hcl_ooi_t hcl_prbfmtv (hcl_t* hcl, const hcl_bch_t* fmt, va_list ap)
 {
 	int x;
-	va_list ap;
 	hcl_fmtout_t fo;
 
 	HCL_MEMSET (&fo, 0, HCL_SIZEOF(fo));
@@ -1725,21 +1748,31 @@ hcl_ooi_t hcl_prbfmt (hcl_t* hcl, const hcl_bch_t* fmt, ...)
 	fo.fmt_str = fmt;
 	fo.ctx = hcl;
 	fo.mask = 0;
-	fo.putbcs = log_bcs;
-	fo.putucs = log_ucs;
+	fo.putbcs = print_bcs;
+	fo.putucs = print_ucs;
 	fo.putobj = hcl_fmt_object_;
 
-	va_start (ap, fmt);
 	x = fmt_outv(&fo, ap);
-	va_end (ap);
 
 	return (x <= -1)? -1: fo.count;
 }
 
-hcl_ooi_t hcl_prufmt (hcl_t* hcl, const hcl_uch_t* fmt, ...)
+hcl_ooi_t hcl_prbfmt (hcl_t* hcl, const hcl_bch_t* fmt, ...)
+{
+	hcl_ooi_t x;
+	va_list ap;
+
+	va_start (ap, fmt);
+	x = hcl_prbfmtv(hcl, fmt, ap);
+	va_end (ap);
+
+	return x;
+}
+
+hcl_ooi_t hcl_prufmtv (hcl_t* hcl, const hcl_uch_t* fmt, va_list ap)
 {
 	int x;
-	va_list ap;
+	
 	hcl_fmtout_t fo;
 
 	HCL_MEMSET (&fo, 0, HCL_SIZEOF(fo));
@@ -1747,17 +1780,26 @@ hcl_ooi_t hcl_prufmt (hcl_t* hcl, const hcl_uch_t* fmt, ...)
 	fo.fmt_str = fmt;
 	fo.ctx = hcl;
 	fo.mask = 0;
-	fo.putbcs = log_bcs;
-	fo.putucs = log_ucs;
+	fo.putbcs = print_bcs;
+	fo.putucs = print_ucs;
 	fo.putobj = hcl_fmt_object_;
 
-	va_start (ap, fmt);
 	x = fmt_outv(&fo, ap);
-	va_end (ap);
 
 	return (x <= -1)? -1: fo.count;
 }
 
+hcl_ooi_t hcl_prufmt (hcl_t* hcl, const hcl_uch_t* fmt, ...)
+{
+	hcl_ooi_t x;
+	va_list ap;
+
+	va_start (ap, fmt);
+	x = hcl_prufmtv(hcl, fmt, ap);
+	va_end (ap);
+
+	return x;
+}
 
 /* --------------------------------------------------------------------------
  * SUPPORT FOR FORMATTED OUTPUT TO BE USED BY BUILTIN PRIMITIVE FUNCTIONS
diff --git a/lib/hcl.h b/lib/hcl.h
index f31b162..01d2be9 100644
--- a/lib/hcl.h
+++ b/lib/hcl.h
@@ -1825,12 +1825,31 @@ HCL_EXPORT hcl_ooi_t hcl_prbfmt (
 	...
 );
 
+HCL_EXPORT hcl_ooi_t hcl_prbfmtv (
+	hcl_t*           hcl,
+	const hcl_bch_t* fmt,
+	va_list          ap
+);
+
 HCL_EXPORT hcl_ooi_t hcl_prufmt (
 	hcl_t*           hcl,
 	const hcl_uch_t* fmt,
 	...
 );
 
+HCL_EXPORT hcl_ooi_t hcl_prufmtv (
+	hcl_t*           hcl,
+	const hcl_uch_t* fmt,
+	va_list          ap
+);
+
+#if defined(HCL_OOCH_IS_UCH)
+#	define hcl_proofmt hcl_prufmt
+#	define hcl_proofmtv hcl_prufmtv
+#else
+#	define hcl_proofmt hcl_prbfmt
+#	define hcl_proofmtv hcl_prbfmtv
+#endif
 /* =========================================================================
  * OBJECT MANAGEMENT
  * ========================================================================= */