diff --git a/qse/include/qse/cmn/str.h b/qse/include/qse/cmn/str.h
index 3a97f251..594f20dc 100644
--- a/qse/include/qse/cmn/str.h
+++ b/qse/include/qse/cmn/str.h
@@ -1,5 +1,5 @@
 /*
- * $Id: str.h 415 2011-03-25 16:02:04Z hyunghwan.chung $
+ * $Id: str.h 416 2011-03-27 05:04:24Z hyunghwan.chung $
  *
     Copyright 2006-2009 Chung, Hyung-Hwan.
     This file is part of QSE.
@@ -723,34 +723,58 @@ qse_wchar_t* qse_wcschr (
 	qse_wcint_t        c
 );
 
+qse_mchar_t* qse_mbsxchr (
+	const qse_mchar_t* str,
+	qse_size_t         len,
+	qse_mcint_t        c
+);
+
+qse_wchar_t* qse_wcsxchr (
+	const qse_wchar_t* str,
+	qse_size_t         len,
+	qse_wcint_t        c
+);
+
+qse_wchar_t* qse_wcsrchr (
+	const qse_wchar_t* str,
+	qse_wcint_t        c
+);
+
+qse_mchar_t* qse_mbsrchr (
+	const qse_mchar_t* str,
+	qse_mcint_t        c
+);
+
+qse_mchar_t* qse_mbsxrchr (
+	const qse_mchar_t* str,
+	qse_size_t         len,
+	qse_mcint_t        c
+);
+
+qse_wchar_t* qse_wcsxrchr (
+	const qse_wchar_t* str,
+	qse_size_t         len,
+	qse_wcint_t        c
+);
+
 #ifdef QSE_CHAR_IS_MCHAR
-#	define qse_strchr(str,c) qse_mbschr(str,c)
+#	define qse_strchr(str,c)        qse_mbschr(str,c)
+#	define qse_strxchr(str,len,c)   qse_mbsxchr(str,len,c)
+#	define qse_strrchr(str,c)       qse_mbsrchr(str,c)
+#	define qse_strxrchr(str,len,c)  qse_mbsxrchr(str,len,c)
 #else
-#	define qse_strchr(str,c) qse_wcschr(str,c)
+#	define qse_strchr(str,c)        qse_wcschr(str,c)
+#	define qse_strxchr(str,len,c)   qse_wcsxchr(str,len,c)
+#	define qse_strrchr(str,c)       qse_wcsrchr(str,c)
+#	define qse_strxrrchr(str,len,c) qse_wcsxrchr(str,len,c)
 #endif
 
-qse_char_t* qse_strxchr (
-	const qse_char_t* str,
-	qse_size_t len,
-	qse_cint_t c
-);
-
-qse_char_t* qse_strrchr (
-	const qse_char_t* str,
-	qse_cint_t c
-);
-
-qse_char_t* qse_strxrchr (
-	const qse_char_t* str,
-	qse_size_t len,
-	qse_cint_t c
-);
 
 /**
  * The qse_strxword() function finds a whole word in a string.
  */
 const qse_char_t* qse_strxword (
-     const qse_char_t* str,
+	const qse_char_t* str,
 	qse_size_t        len,
 	const qse_char_t* word
 );
@@ -760,7 +784,7 @@ const qse_char_t* qse_strxword (
  * case-insensitively.
  */
 const qse_char_t* qse_strxcaseword (
-     const qse_char_t* str,
+	const qse_char_t* str,
 	qse_size_t        len,
 	const qse_char_t* word
 );
diff --git a/qse/lib/cmn/Makefile.am b/qse/lib/cmn/Makefile.am
index dea64d81..68778d4f 100644
--- a/qse/lib/cmn/Makefile.am
+++ b/qse/lib/cmn/Makefile.am
@@ -9,7 +9,7 @@ lib_LTLIBRARIES = libqsecmn.la
 libqsecmn_la_SOURCES = \
 	syscall.h mem.h \
 	mem.c xma.c fma.c chr.c chr_cnv.c rex.c \
-	str_bas.c str_cnv.c str_cmp.c str_cpy.c str_dyn.c str_fcpy.c \
+	str_bas.c str_chr.c str_cnv.c str_cmp.c str_cpy.c str_dyn.c str_fcpy.c \
 	str_pbrk.c str_put.c str_spn.c str_utl.c \
 	lda.c oht.c htb.c rbt.c sll.c gdl.c dll.c opt.c \
 	tio.c tio_get.c tio_put.c \
diff --git a/qse/lib/cmn/Makefile.in b/qse/lib/cmn/Makefile.in
index eb21742e..9a1f1db0 100644
--- a/qse/lib/cmn/Makefile.in
+++ b/qse/lib/cmn/Makefile.in
@@ -73,11 +73,12 @@ am__installdirs = "$(DESTDIR)$(libdir)"
 LTLIBRARIES = $(lib_LTLIBRARIES)
 libqsecmn_la_DEPENDENCIES =
 am_libqsecmn_la_OBJECTS = mem.lo xma.lo fma.lo chr.lo chr_cnv.lo \
-	rex.lo str_bas.lo str_cnv.lo str_cmp.lo str_cpy.lo str_dyn.lo \
-	str_fcpy.lo str_pbrk.lo str_put.lo str_spn.lo str_utl.lo \
-	lda.lo oht.lo htb.lo rbt.lo sll.lo gdl.lo dll.lo opt.lo tio.lo \
-	tio_get.lo tio_put.lo fio.lo pio.lo sio.lo alg_search.lo \
-	alg_sort.lo time.lo misc.lo assert.lo main.lo stdio.lo
+	rex.lo str_bas.lo str_chr.lo str_cnv.lo str_cmp.lo str_cpy.lo \
+	str_dyn.lo str_fcpy.lo str_pbrk.lo str_put.lo str_spn.lo \
+	str_utl.lo lda.lo oht.lo htb.lo rbt.lo sll.lo gdl.lo dll.lo \
+	opt.lo tio.lo tio_get.lo tio_put.lo fio.lo pio.lo sio.lo \
+	alg_search.lo alg_sort.lo time.lo misc.lo assert.lo main.lo \
+	stdio.lo
 libqsecmn_la_OBJECTS = $(am_libqsecmn_la_OBJECTS)
 libqsecmn_la_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
@@ -265,7 +266,7 @@ lib_LTLIBRARIES = libqsecmn.la $(am__append_1)
 libqsecmn_la_SOURCES = \
 	syscall.h mem.h \
 	mem.c xma.c fma.c chr.c chr_cnv.c rex.c \
-	str_bas.c str_cnv.c str_cmp.c str_cpy.c str_dyn.c str_fcpy.c \
+	str_bas.c str_chr.c str_cnv.c str_cmp.c str_cpy.c str_dyn.c str_fcpy.c \
 	str_pbrk.c str_put.c str_spn.c str_utl.c \
 	lda.c oht.c htb.c rbt.c sll.c gdl.c dll.c opt.c \
 	tio.c tio_get.c tio_put.c \
@@ -385,6 +386,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sll.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/stdio.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/str_bas.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/str_chr.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/str_cmp.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/str_cnv.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/str_cpy.Plo@am__quote@
diff --git a/qse/lib/cmn/str_bas.c b/qse/lib/cmn/str_bas.c
index 59813698..ad2a5c2c 100644
--- a/qse/lib/cmn/str_bas.c
+++ b/qse/lib/cmn/str_bas.c
@@ -1,5 +1,5 @@
 /*
- * $Id: str_bas.c 413 2011-03-25 04:36:43Z hyunghwan.chung $
+ * $Id: str_bas.c 416 2011-03-27 05:04:24Z hyunghwan.chung $
  *
     Copyright 2006-2009 Chung, Hyung-Hwan.
     This file is part of QSE.
@@ -401,65 +401,6 @@ qse_char_t* qse_strxnrstr (
 	return QSE_NULL;
 }
 
-qse_mchar_t* qse_mbschr (const qse_mchar_t* str, qse_mcint_t c)
-{
-	while (*str != QSE_MT('\0')) 
-	{
-		if (*str == c) return (qse_mchar_t*)str;
-		str++;
-	}
-	return QSE_NULL;
-}
-
-qse_wchar_t* qse_wcschr (const qse_wchar_t* str, qse_wcint_t c)
-{
-	while (*str != QSE_WT('\0')) 
-	{
-		if (*str == c) return (qse_wchar_t*)str;
-		str++;
-	}
-	return QSE_NULL;
-}
-
-qse_char_t* qse_strxchr (const qse_char_t* str, qse_size_t len, qse_cint_t c)
-{
-	const qse_char_t* end = str + len;
-
-	while (str < end) 
-	{
-		if (*str == c) return (qse_char_t*)str;
-		str++;
-	}
-
-	return QSE_NULL;
-}
-
-qse_char_t* qse_strrchr (const qse_char_t* str, qse_cint_t c)
-{
-	const qse_char_t* end = str;
-
-	while (*end != QSE_T('\0')) end++;
-
-	while (end > str) 
-	{
-		if (*--end == c) return (qse_char_t*)end;
-	}
-
-	return QSE_NULL;
-}
-
-qse_char_t* qse_strxrchr (const qse_char_t* str, qse_size_t len, qse_cint_t c)
-{
-	const qse_char_t* end = str + len;
-
-	while (end > str) 
-	{
-		if (*--end == c) return (qse_char_t*)end;
-	}
-
-	return QSE_NULL;
-}
-
 const qse_char_t* qse_strxword (
 	const qse_char_t* str, qse_size_t len, const qse_char_t* word)
 {
diff --git a/qse/lib/cmn/str_chr.c b/qse/lib/cmn/str_chr.c
new file mode 100644
index 00000000..09b94263
--- /dev/null
+++ b/qse/lib/cmn/str_chr.c
@@ -0,0 +1,121 @@
+/*
+ * $Id$
+ *
+    Copyright 2006-2009 Chung, Hyung-Hwan.
+    This file is part of QSE.
+
+    QSE is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as
+    published by the Free Software Foundation, either version 3 of
+    the License, or (at your option) any later version.
+
+    QSE is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with QSE. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <qse/cmn/str.h>
+
+qse_mchar_t* qse_mbschr (const qse_mchar_t* str, qse_mcint_t c)
+{
+	while (*str != QSE_MT('\0')) 
+	{
+		if (*str == c) return (qse_mchar_t*)str;
+		str++;
+	}
+	return QSE_NULL;
+}
+
+qse_mchar_t* qse_mbsxchr (const qse_mchar_t* str, qse_size_t len, qse_mcint_t c)
+{
+	const qse_mchar_t* end = str + len;
+
+	while (str < end) 
+	{
+		if (*str == c) return (qse_mchar_t*)str;
+		str++;
+	}
+
+	return QSE_NULL;
+}
+
+qse_mchar_t* qse_mbsrchr (const qse_mchar_t* str, qse_mcint_t c)
+{
+	const qse_mchar_t* end = str;
+
+	while (*end != QSE_MT('\0')) end++;
+
+	while (end > str) 
+	{
+		if (*--end == c) return (qse_mchar_t*)end;
+	}
+
+	return QSE_NULL;
+}
+
+qse_mchar_t* qse_mbsxrchr (const qse_mchar_t* str, qse_size_t len, qse_mcint_t c)
+{
+	const qse_mchar_t* end = str + len;
+
+	while (end > str) 
+	{
+		if (*--end == c) return (qse_mchar_t*)end;
+	}
+
+	return QSE_NULL;
+}
+
+qse_wchar_t* qse_wcschr (const qse_wchar_t* str, qse_wcint_t c)
+{
+	while (*str != QSE_WT('\0')) 
+	{
+		if (*str == c) return (qse_wchar_t*)str;
+		str++;
+	}
+	return QSE_NULL;
+}
+
+qse_wchar_t* qse_wcsxchr (const qse_wchar_t* str, qse_size_t len, qse_wcint_t c)
+{
+	const qse_wchar_t* end = str + len;
+
+	while (str < end) 
+	{
+		if (*str == c) return (qse_wchar_t*)str;
+		str++;
+	}
+
+	return QSE_NULL;
+}
+
+qse_wchar_t* qse_wcsrchr (const qse_wchar_t* str, qse_wcint_t c)
+{
+	const qse_wchar_t* end = str;
+
+	while (*end != QSE_MT('\0')) end++;
+
+	while (end > str) 
+	{
+		if (*--end == c) return (qse_wchar_t*)end;
+	}
+
+	return QSE_NULL;
+}
+
+qse_wchar_t* qse_wcsxrchr (const qse_wchar_t* str, qse_size_t len, qse_wcint_t c)
+{
+	const qse_wchar_t* end = str + len;
+
+	while (end > str) 
+	{
+		if (*--end == c) return (qse_wchar_t*)end;
+	}
+
+	return QSE_NULL;
+}
+
+