diff --git a/lib/hcl.c b/lib/hcl.c
index 43351b9..d7bd563 100644
--- a/lib/hcl.c
+++ b/lib/hcl.c
@@ -738,7 +738,6 @@ void hcl_freemem (hcl_t* hcl, void* ptr)
 
 #include "../mod/_core.h"
 #include "../mod/_dic.h"
-#include "../mod/_str.h"
 #include "../mod/_sys.h"
 
 static struct
@@ -750,7 +749,6 @@ static_modtab[] =
 {
 	{ "core",     hcl_mod_core },
 	{ "dic",      hcl_mod_dic },
-	{ "str",      hcl_mod_str },
 	{ "sys",      hcl_mod_sys }
 };
 #endif
@@ -985,7 +983,6 @@ hcl_pfbase_t* hcl_querymod (hcl_t* hcl, const hcl_ooch_t* pfid, hcl_oow_t pfidle
 	return pfbase;
 }
 
-
 hcl_pfbase_t* hcl_findpfbase (hcl_t* hcl, hcl_pfinfo_t* pfinfo, hcl_oow_t pfcount, const hcl_ooch_t* name, hcl_oow_t namelen)
 {
 	int n;
@@ -1000,7 +997,7 @@ hcl_pfbase_t* hcl_findpfbase (hcl_t* hcl, hcl_pfinfo_t* pfinfo, hcl_oow_t pfcoun
 		/*mid = (left + right) / 2;*/
 		mid = left + ((right - left) / 2);
 
-		n = hcl_comp_oochars_oocstr (name, namelen, pfinfo[mid].mthname);
+		n = hcl_comp_oochars_bcstr(name, namelen, pfinfo[mid].mthname);
 		if (n < 0) right = mid - 1; /* this substraction can make right negative. so i can't use hcl_oow_t for the variable */
 		else if (n > 0) left = mid + 1;
 		else return &pfinfo[mid].base;
@@ -1012,7 +1009,7 @@ hcl_pfbase_t* hcl_findpfbase (hcl_t* hcl, hcl_pfinfo_t* pfinfo, hcl_oow_t pfcoun
 	for (base = 0, lim = pfcount; lim > 0; lim >>= 1)
 	{
 		mid = base + (lim >> 1);
-		n = hcl_comp_oochars_oocstr (name, namelen, pfinfo[mid].mthname);
+		n = hcl_comp_oochars_bcstr(name, namelen, pfinfo[mid].mthname);
 		if (n == 0) return &pfinfo[mid].base;
 		if (n > 0) { base = mid + 1; lim--; }
 	}
diff --git a/lib/hcl.h b/lib/hcl.h
index cdcee8c..31aa172 100644
--- a/lib/hcl.h
+++ b/lib/hcl.h
@@ -1466,7 +1466,7 @@ struct hcl_pfbase_t
 typedef struct hcl_pfinfo_t hcl_pfinfo_t;
 struct hcl_pfinfo_t
 {
-	hcl_ooch_t        mthname[32];
+	const hcl_bch_t*  mthname;
 	hcl_pfbase_t      base;
 };
 /* =========================================================================
diff --git a/mod/Makefile.am b/mod/Makefile.am
index 320fff4..24d1c39 100644
--- a/mod/Makefile.am
+++ b/mod/Makefile.am
@@ -22,7 +22,6 @@ noinst_LTLIBRARIES =
 
 noinst_LTLIBRARIES += libhcl-core.la
 noinst_LTLIBRARIES += libhcl-dic.la
-noinst_LTLIBRARIES += libhcl-str.la
 noinst_LTLIBRARIES += libhcl-sys.la
 
 else
@@ -38,7 +37,6 @@ pkgmodexec_LTLIBRARIES =
 
 pkgmodexec_LTLIBRARIES += libhcl-core.la
 pkgmodexec_LTLIBRARIES += libhcl-dic.la 
-pkgmodexec_LTLIBRARIES += libhcl-str.la 
 pkgmodexec_LTLIBRARIES += libhcl-sys.la 
 
 endif
@@ -55,12 +53,6 @@ libhcl_dic_la_CFLAGS = $(CFLAGS_COMMON)
 libhcl_dic_la_LDFLAGS = $(LDFLAGS_COMMON)
 libhcl_dic_la_LIBADD = $(LIBADD_COMMON)
 
-libhcl_str_la_SOURCES = str.c _str.h
-libhcl_str_la_CPPFLAGS = $(CPPFLAGS_COMMON)
-libhcl_str_la_CFLAGS = $(CFLAGS_COMMON)
-libhcl_str_la_LDFLAGS = $(LDFLAGS_COMMON)
-libhcl_str_la_LIBADD = $(LIBADD_COMMON)
-
 libhcl_sys_la_SOURCES = sys.c _sys.h
 libhcl_sys_la_CPPFLAGS = $(CPPFLAGS_COMMON)
 libhcl_sys_la_CFLAGS = $(CFLAGS_COMMON)
diff --git a/mod/Makefile.in b/mod/Makefile.in
index f99ccf7..c2d2b9c 100644
--- a/mod/Makefile.in
+++ b/mod/Makefile.in
@@ -155,15 +155,6 @@ libhcl_dic_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 @ENABLE_STATIC_MODULE_FALSE@am_libhcl_dic_la_rpath = -rpath \
 @ENABLE_STATIC_MODULE_FALSE@	$(pkgmodexecdir)
 @ENABLE_STATIC_MODULE_TRUE@am_libhcl_dic_la_rpath =
-libhcl_str_la_DEPENDENCIES = $(am__DEPENDENCIES_1)
-am_libhcl_str_la_OBJECTS = libhcl_str_la-str.lo
-libhcl_str_la_OBJECTS = $(am_libhcl_str_la_OBJECTS)
-libhcl_str_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
-	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(libhcl_str_la_CFLAGS) \
-	$(CFLAGS) $(libhcl_str_la_LDFLAGS) $(LDFLAGS) -o $@
-@ENABLE_STATIC_MODULE_FALSE@am_libhcl_str_la_rpath = -rpath \
-@ENABLE_STATIC_MODULE_FALSE@	$(pkgmodexecdir)
-@ENABLE_STATIC_MODULE_TRUE@am_libhcl_str_la_rpath =
 libhcl_sys_la_DEPENDENCIES = $(am__DEPENDENCIES_1)
 am_libhcl_sys_la_OBJECTS = libhcl_sys_la-sys.lo
 libhcl_sys_la_OBJECTS = $(am_libhcl_sys_la_OBJECTS)
@@ -190,7 +181,6 @@ depcomp = $(SHELL) $(top_srcdir)/ac/depcomp
 am__maybe_remake_depfiles = depfiles
 am__depfiles_remade = ./$(DEPDIR)/libhcl_core_la-core.Plo \
 	./$(DEPDIR)/libhcl_dic_la-dic.Plo \
-	./$(DEPDIR)/libhcl_str_la-str.Plo \
 	./$(DEPDIR)/libhcl_sys_la-sys.Plo
 am__mv = mv -f
 COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
@@ -212,9 +202,9 @@ am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
 am__v_CCLD_0 = @echo "  CCLD    " $@;
 am__v_CCLD_1 = 
 SOURCES = $(libhcl_core_la_SOURCES) $(libhcl_dic_la_SOURCES) \
-	$(libhcl_str_la_SOURCES) $(libhcl_sys_la_SOURCES)
+	$(libhcl_sys_la_SOURCES)
 DIST_SOURCES = $(libhcl_core_la_SOURCES) $(libhcl_dic_la_SOURCES) \
-	$(libhcl_str_la_SOURCES) $(libhcl_sys_la_SOURCES)
+	$(libhcl_sys_la_SOURCES)
 am__can_run_installinfo = \
   case $$AM_UPDATE_INFO_DIR in \
     n|no|NO) false;; \
@@ -400,12 +390,10 @@ CFLAGS_COMMON =
 @ENABLE_STATIC_MODULE_FALSE@LIBADD_COMMON = -lhcl
 @ENABLE_STATIC_MODULE_TRUE@LIBADD_COMMON = 
 @ENABLE_STATIC_MODULE_TRUE@noinst_LTLIBRARIES = libhcl-core.la \
-@ENABLE_STATIC_MODULE_TRUE@	libhcl-dic.la libhcl-str.la \
-@ENABLE_STATIC_MODULE_TRUE@	libhcl-sys.la
+@ENABLE_STATIC_MODULE_TRUE@	libhcl-dic.la libhcl-sys.la
 @ENABLE_STATIC_MODULE_FALSE@pkgmodexecdir = $(libdir)
 @ENABLE_STATIC_MODULE_FALSE@pkgmodexec_LTLIBRARIES = libhcl-core.la \
-@ENABLE_STATIC_MODULE_FALSE@	libhcl-dic.la libhcl-str.la \
-@ENABLE_STATIC_MODULE_FALSE@	libhcl-sys.la
+@ENABLE_STATIC_MODULE_FALSE@	libhcl-dic.la libhcl-sys.la
 libhcl_core_la_SOURCES = core.c _core.h
 libhcl_core_la_CPPFLAGS = $(CPPFLAGS_COMMON)
 libhcl_core_la_CFLAGS = $(CFLAGS_COMMON)
@@ -416,11 +404,6 @@ libhcl_dic_la_CPPFLAGS = $(CPPFLAGS_COMMON)
 libhcl_dic_la_CFLAGS = $(CFLAGS_COMMON)
 libhcl_dic_la_LDFLAGS = $(LDFLAGS_COMMON)
 libhcl_dic_la_LIBADD = $(LIBADD_COMMON)
-libhcl_str_la_SOURCES = str.c _str.h
-libhcl_str_la_CPPFLAGS = $(CPPFLAGS_COMMON)
-libhcl_str_la_CFLAGS = $(CFLAGS_COMMON)
-libhcl_str_la_LDFLAGS = $(LDFLAGS_COMMON)
-libhcl_str_la_LIBADD = $(LIBADD_COMMON)
 libhcl_sys_la_SOURCES = sys.c _sys.h
 libhcl_sys_la_CPPFLAGS = $(CPPFLAGS_COMMON)
 libhcl_sys_la_CFLAGS = $(CFLAGS_COMMON)
@@ -512,9 +495,6 @@ libhcl-core.la: $(libhcl_core_la_OBJECTS) $(libhcl_core_la_DEPENDENCIES) $(EXTRA
 libhcl-dic.la: $(libhcl_dic_la_OBJECTS) $(libhcl_dic_la_DEPENDENCIES) $(EXTRA_libhcl_dic_la_DEPENDENCIES) 
 	$(AM_V_CCLD)$(libhcl_dic_la_LINK) $(am_libhcl_dic_la_rpath) $(libhcl_dic_la_OBJECTS) $(libhcl_dic_la_LIBADD) $(LIBS)
 
-libhcl-str.la: $(libhcl_str_la_OBJECTS) $(libhcl_str_la_DEPENDENCIES) $(EXTRA_libhcl_str_la_DEPENDENCIES) 
-	$(AM_V_CCLD)$(libhcl_str_la_LINK) $(am_libhcl_str_la_rpath) $(libhcl_str_la_OBJECTS) $(libhcl_str_la_LIBADD) $(LIBS)
-
 libhcl-sys.la: $(libhcl_sys_la_OBJECTS) $(libhcl_sys_la_DEPENDENCIES) $(EXTRA_libhcl_sys_la_DEPENDENCIES) 
 	$(AM_V_CCLD)$(libhcl_sys_la_LINK) $(am_libhcl_sys_la_rpath) $(libhcl_sys_la_OBJECTS) $(libhcl_sys_la_LIBADD) $(LIBS)
 
@@ -526,7 +506,6 @@ distclean-compile:
 
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhcl_core_la-core.Plo@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhcl_dic_la-dic.Plo@am__quote@ # am--include-marker
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhcl_str_la-str.Plo@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhcl_sys_la-sys.Plo@am__quote@ # am--include-marker
 
 $(am__depfiles_remade):
@@ -573,13 +552,6 @@ libhcl_dic_la-dic.lo: dic.c
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_dic_la_CPPFLAGS) $(CPPFLAGS) $(libhcl_dic_la_CFLAGS) $(CFLAGS) -c -o libhcl_dic_la-dic.lo `test -f 'dic.c' || echo '$(srcdir)/'`dic.c
 
-libhcl_str_la-str.lo: str.c
-@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_str_la_CPPFLAGS) $(CPPFLAGS) $(libhcl_str_la_CFLAGS) $(CFLAGS) -MT libhcl_str_la-str.lo -MD -MP -MF $(DEPDIR)/libhcl_str_la-str.Tpo -c -o libhcl_str_la-str.lo `test -f 'str.c' || echo '$(srcdir)/'`str.c
-@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libhcl_str_la-str.Tpo $(DEPDIR)/libhcl_str_la-str.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='str.c' object='libhcl_str_la-str.lo' libtool=yes @AMDEPBACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_str_la_CPPFLAGS) $(CPPFLAGS) $(libhcl_str_la_CFLAGS) $(CFLAGS) -c -o libhcl_str_la-str.lo `test -f 'str.c' || echo '$(srcdir)/'`str.c
-
 libhcl_sys_la-sys.lo: sys.c
 @am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_sys_la_CPPFLAGS) $(CPPFLAGS) $(libhcl_sys_la_CFLAGS) $(CFLAGS) -MT libhcl_sys_la-sys.lo -MD -MP -MF $(DEPDIR)/libhcl_sys_la-sys.Tpo -c -o libhcl_sys_la-sys.lo `test -f 'sys.c' || echo '$(srcdir)/'`sys.c
 @am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libhcl_sys_la-sys.Tpo $(DEPDIR)/libhcl_sys_la-sys.Plo
@@ -722,7 +694,6 @@ clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
 distclean: distclean-am
 		-rm -f ./$(DEPDIR)/libhcl_core_la-core.Plo
 	-rm -f ./$(DEPDIR)/libhcl_dic_la-dic.Plo
-	-rm -f ./$(DEPDIR)/libhcl_str_la-str.Plo
 	-rm -f ./$(DEPDIR)/libhcl_sys_la-sys.Plo
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
@@ -771,7 +742,6 @@ installcheck-am:
 maintainer-clean: maintainer-clean-am
 		-rm -f ./$(DEPDIR)/libhcl_core_la-core.Plo
 	-rm -f ./$(DEPDIR)/libhcl_dic_la-dic.Plo
-	-rm -f ./$(DEPDIR)/libhcl_str_la-str.Plo
 	-rm -f ./$(DEPDIR)/libhcl_sys_la-sys.Plo
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-generic
diff --git a/mod/_str.h b/mod/_str.h
deleted file mode 100644
index 768f2c3..0000000
--- a/mod/_str.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * $Id$
- *
-    Copyright (c) 2016-2018 Chung, Hyung-Hwan. All rights reserved.
-
-    Redistribution and use in source and binary forms, with or without
-    modification, are permitted provided that the following conditions
-    are met:
-    1. Redistributions of source code must retain the above copyright
-       notice, this list of conditions and the following disclaimer.
-    2. Redistributions in binary form must reproduce the above copyright
-       notice, this list of conditions and the following disclaimer in the
-       documentation and/or other materials provided with the distribution.
-
-    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
-    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef _HCL_MOD_STR_H_
-#define _HCL_MOD_STR_H_
-
-#include <hcl.h>
-
-#if defined(__cplusplus)
-extern "C" {
-#endif
-
-HCL_EXPORT int hcl_mod_str (hcl_t* hcl, hcl_mod_t* mod);
-
-#if defined(__cplusplus)
-}
-#endif
-
-#endif
-
diff --git a/mod/core.c b/mod/core.c
index f30f72d..36b487a 100644
--- a/mod/core.c
+++ b/mod/core.c
@@ -377,15 +377,15 @@ static hcl_pfrc_t pf_core_put (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
 
 static hcl_pfinfo_t pfinfos[] =
 {
-	{ { 'b','a','s','i','c','_','n','e','w','\0' },          { HCL_PFBASE_FUNC, pf_core_basic_new,       2,  2 } },
-	{ { 'c','l','a','s','s','_','n','a','m','e','\0' },      { HCL_PFBASE_FUNC, pf_core_get_class_name,  1,  1 } },
-	{ { 'c','r','e','s','p','_','t','o', '\0' },             { HCL_PFBASE_FUNC, pf_core_cresp_to,        2,  2 } },
-	{ { 'g','e','t','\0' },                                  { HCL_PFBASE_FUNC, pf_core_get,             2,  2 } },
-	{ { 'i','r','e','s','p','_','t','o', '\0' },             { HCL_PFBASE_FUNC, pf_core_iresp_to,        2,  2 } },
-	{ { 'l','e','n','g','t','h','\0' },                      { HCL_PFBASE_FUNC, pf_core_size,            1,  1 } },
-	{ { 'p','u','t','\0' },                                  { HCL_PFBASE_FUNC, pf_core_put,             3,  3 } },
-	{ { 's','i','z','e','\0' },                              { HCL_PFBASE_FUNC, pf_core_size,            1,  1 } },
-	{ { 's','l','i','c','e','\0' },                          { HCL_PFBASE_FUNC, pf_core_slice,           3,  3 } }
+	{ "basic_new",          { HCL_PFBASE_FUNC, pf_core_basic_new,       2,  2 } },
+	{ "class_name",         { HCL_PFBASE_FUNC, pf_core_get_class_name,  1,  1 } },
+     { "cresp_to",           { HCL_PFBASE_FUNC, pf_core_cresp_to,        2,  2 } },
+	{ "get",                { HCL_PFBASE_FUNC, pf_core_get,             2,  2 } },
+	{ "iresp_to",           { HCL_PFBASE_FUNC, pf_core_iresp_to,        2,  2 } },
+	{ "length",             { HCL_PFBASE_FUNC, pf_core_size,            1,  1 } },
+	{ "put",                { HCL_PFBASE_FUNC, pf_core_put,             3,  3 } },
+	{ "size",               { HCL_PFBASE_FUNC, pf_core_size,            1,  1 } },
+	{ "slice",              { HCL_PFBASE_FUNC, pf_core_slice,           3,  3 } }
 };
 
 /* ------------------------------------------------------------------------ */
diff --git a/mod/dic.c b/mod/dic.c
index 86302f4..e72a97a 100644
--- a/mod/dic.c
+++ b/mod/dic.c
@@ -110,10 +110,10 @@ static hcl_pfrc_t pf_dic_walk (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
 
 static hcl_pfinfo_t pfinfos[] =
 {
-	{ { 'g','e','t','\0' },      { HCL_PFBASE_FUNC, pf_dic_get,     2,  2 } },
-/*	{ { 'm','a','k','e','\0' },  { HCL_PFBASE_FUNC, pf_dic_make,    1,  1 } }, */
-	{ { 'p','u','t','\0' },      { HCL_PFBASE_FUNC, pf_dic_put,     3,  3 } },
-	{ { 'w','a','l','k','\0' },  { HCL_PFBASE_FUNC, pf_dic_walk,    2,  2 } },
+	{ "get",   { HCL_PFBASE_FUNC, pf_dic_get,     2,  2 } },
+/*	{ "make",  { HCL_PFBASE_FUNC, pf_dic_make,    1,  1 } }, */
+	{ "put",   { HCL_PFBASE_FUNC, pf_dic_put,     3,  3 } },
+	{ "walk",  { HCL_PFBASE_FUNC, pf_dic_walk,    2,  2 } },
 };
 
 /* ------------------------------------------------------------------------ */
diff --git a/mod/str.c b/mod/str.c
deleted file mode 100644
index 9519f30..0000000
--- a/mod/str.c
+++ /dev/null
@@ -1,194 +0,0 @@
-/*
- * $Id$
- *
-    Copyright (c) 2016-2018 Chung, Hyung-Hwan. All rights reserved.
-
-    Redistribution and use in source and binary forms, with or without
-    modification, are permitted provided that the following conditions
-    are met:
-    1. Redistributions of source code must retain the above copyright
-       notice, this list of conditions and the following disclaimer.
-    2. Redistributions in binary form must reproduce the above copyright
-       notice, this list of conditions and the following disclaimer in the
-       documentation and/or other materials provided with the distribution.
-
-    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
-    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-#include "_str.h"
-
-static hcl_pfrc_t pf_str_at (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
-{
-	hcl_oop_t str, pos;
-	hcl_ooch_t cv;
-	hcl_ooi_t size;
-	hcl_ooi_t idx;
-
-	str = HCL_STACK_GETARG(hcl, nargs, 0);
-	pos = HCL_STACK_GETARG(hcl, nargs, 1);
-
-	if (!HCL_IS_STRING(hcl, str))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not string - %O", str);
-		return HCL_PF_FAILURE;
-	}
-
-	if (!HCL_OOP_IS_SMOOI(pos))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not smooi - %O", pos);
-		return HCL_PF_FAILURE;
-	}
-
-	idx = HCL_OOP_TO_SMOOI(pos);
-	size = HCL_OBJ_GET_SIZE(str);
-	if (idx <= -1 || idx >= size)
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter out of range - %O", pos);
-		return HCL_PF_FAILURE;
-	}
-	cv = HCL_OBJ_GET_CHAR_VAL(str, idx);
-	HCL_STACK_SETRET (hcl, nargs, HCL_CHAR_TO_OOP(cv));
-	return HCL_PF_SUCCESS;
-}
-
-static hcl_pfrc_t pf_str_at_put (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
-{
-	hcl_oop_t str, pos, val;
-	hcl_ooch_t cv;
-	hcl_ooi_t size;
-	hcl_ooi_t idx;
-
-	str = HCL_STACK_GETARG(hcl, nargs, 0);
-	pos = HCL_STACK_GETARG(hcl, nargs, 1);
-	val = HCL_STACK_GETARG(hcl, nargs, 2);
-
-	if (!HCL_IS_STRING(hcl, str))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not string - %O", str);
-		return HCL_PF_FAILURE;
-	}
-
-	if (!HCL_OOP_IS_SMOOI(pos))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not integer - %O", pos);
-		return HCL_PF_FAILURE;
-	}
-
-	if (!HCL_OOP_IS_CHAR(val))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not character - %O", pos);
-		return HCL_PF_FAILURE;
-	}
-
-	idx = HCL_OOP_TO_SMOOI(pos);
-	size = HCL_OBJ_GET_SIZE(str);
-	if (idx <= -1 || idx >= size)
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter out of range - %O", pos);
-		return HCL_PF_FAILURE;
-	}
-
-	cv = HCL_OOP_TO_CHAR(val);
-	HCL_OBJ_SET_CHAR_VAL(str, idx, cv);
-	HCL_STACK_SETRET (hcl, nargs, val);
-	return HCL_PF_SUCCESS;
-}
-
-static hcl_pfrc_t pf_str_length (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
-{
-	hcl_oop_t str;
-	hcl_ooi_t size;
-
-	str = HCL_STACK_GETARG(hcl, nargs, 0);
-
-	if (!HCL_IS_STRING(hcl, str))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not string - %O", str);
-		return HCL_PF_FAILURE;
-	}
-
-	size = HCL_OBJ_GET_SIZE(str);
-	HCL_STACK_SETRET (hcl, nargs, HCL_SMOOI_TO_OOP(size));
-	return HCL_PF_SUCCESS;
-}
-
-static hcl_pfrc_t pf_str_slice (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
-{
-	hcl_oop_t str, slice, a1, a2;
-	hcl_ooi_t size;
-	hcl_ooi_t pos;
-	hcl_ooi_t len;
-
-	str = HCL_STACK_GETARG(hcl, nargs, 0);
-	a1 = HCL_STACK_GETARG(hcl, nargs, 1);
-	a2 = HCL_STACK_GETARG(hcl, nargs, 2);
-
-	if (!HCL_IS_STRING(hcl, str))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not string - %O", str);
-		return HCL_PF_FAILURE;
-	}
-	if (!HCL_OOP_IS_SMOOI(a1))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "position not numeric - %O", a1);
-		return HCL_PF_FAILURE;
-	}
-	if (!HCL_OOP_IS_SMOOI(a2))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "length not numeric - %O", a2);
-		return HCL_PF_FAILURE;
-	}
-
-	size = HCL_OBJ_GET_SIZE(str);
-	pos = HCL_OOP_TO_SMOOI(a1);
-	len = HCL_OOP_TO_SMOOI(a2);
-
-	if (pos < 0) pos = 0;
-	else if (pos >= size) pos = size;
-	if (len >= size - pos) len = size - pos;
-	slice = hcl_makestring(hcl, HCL_OBJ_GET_CHAR_PTR(str, pos), len, 0);
-	if (HCL_UNLIKELY(!slice)) return HCL_PF_FAILURE;
-
-	HCL_STACK_SETRET (hcl, nargs, slice);
-	return HCL_PF_SUCCESS;
-}
-
-static hcl_pfinfo_t pfinfos[] =
-{
-	/*{ { 'V','A','R','\0' },                  { HCL_PFBASE_VAR,  HCL_NULL,           0,  0 } },*/
-	{ { 'a','t','\0' },                      { HCL_PFBASE_FUNC,  pf_str_at,         2,  2 } },
-	{ { 'a','t','P','u','t','\0' },          { HCL_PFBASE_FUNC,  pf_str_at_put,     3,  3 } },
-	{ { 'l','e','n','g','t','h','\0' },      { HCL_PFBASE_FUNC,  pf_str_length,     1,  1 } },
-	{ { 's','i','z','e'},                    { HCL_PFBASE_FUNC,  pf_str_length,     1,  1 } },
-	{ { 's','l','i','c','e'},                { HCL_PFBASE_FUNC,  pf_str_slice,      3,  3 } },
-	{ { 's','u','b','s','t','r'},            { HCL_PFBASE_FUNC,  pf_str_slice,      3,  3 } }
-};
-
-/* ------------------------------------------------------------------------ */
-
-static hcl_pfbase_t* query (hcl_t* hcl, hcl_mod_t* mod, const hcl_ooch_t* name, hcl_oow_t namelen)
-{
-	return hcl_findpfbase(hcl, pfinfos, HCL_COUNTOF(pfinfos), name, namelen);
-}
-
-static void unload (hcl_t* hcl, hcl_mod_t* mod)
-{
-}
-
-int hcl_mod_str (hcl_t* hcl, hcl_mod_t* mod)
-{
-	mod->query = query;
-	mod->unload = unload; 
-	mod->ctx = HCL_NULL;
-	return 0;
-}
diff --git a/mod/sys.c b/mod/sys.c
index 63bb5a4..080b957 100644
--- a/mod/sys.c
+++ b/mod/sys.c
@@ -147,10 +147,10 @@ static hcl_pfrc_t pf_sys_random (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
 
 static hcl_pfinfo_t pfinfos[] =
 {
-	{ { 'r','a','n','d','o','m','\0' },      { HCL_PFBASE_FUNC,  pf_sys_random,       0,  0 } },
-	{ { 's','r','a','n','d','o','m','\0' },  { HCL_PFBASE_FUNC,  pf_sys_srandom,      1,  1 } },
-	{ { 's','t','i','m','e','\0' },          { HCL_PFBASE_FUNC,  pf_sys_stime,        1,  1 } },
-	{ { 't','i','m','e','\0' },              { HCL_PFBASE_FUNC,  pf_sys_time,         0,  0 } }
+	{ "random",      { HCL_PFBASE_FUNC,  pf_sys_random,       0,  0 } },
+	{ "srandom",     { HCL_PFBASE_FUNC,  pf_sys_srandom,      1,  1 } },
+	{ "stime",       { HCL_PFBASE_FUNC,  pf_sys_stime,        1,  1 } },
+	{ "time",        { HCL_PFBASE_FUNC,  pf_sys_time,         0,  0 } }
 };
 
 /* ------------------------------------------------------------------------ */
diff --git a/src/kernel.hcl b/src/kernel.hcl
index 9ef6f65..3da6e66 100644
--- a/src/kernel.hcl
+++ b/src/kernel.hcl
@@ -146,4 +146,4 @@ printf "[%O]\n" (" ":respondsTo "length")
 ##printf "[%O]\n" (String:classVariableNames)
 ##printf "[%O]\n" (String:instanceVariableNames)
 
-printf "%O\n" #"abcdefg"
+##printf "%O\n" #"abcdefg"