diff --git a/qse/include/qse/cmn/str.h b/qse/include/qse/cmn/str.h
index f7763148..25360da0 100644
--- a/qse/include/qse/cmn/str.h
+++ b/qse/include/qse/cmn/str.h
@@ -1,5 +1,5 @@
 /*
- * $Id: str.h 90 2009-03-01 09:58:19Z hyunghwan.chung $
+ * $Id: str.h 110 2009-03-24 05:52:27Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -420,37 +420,68 @@ void qse_str_setsizer (
 );
 /******/
 
-/*
- * NAME: get capacity
- *
- * DESCRIPTION:
+/****f* Common/qse_str_getcapa
+ * NAME
+ *  qse_str_getcapa - get capacity
+ * DESCRIPTION
  *  The qse_str_getcapa() function returns the current capacity.
  *  You may use QSE_STR_CAPA(str) macro for performance sake.
- *
- * RETURNS: the current capacity in number of characters.
+ * RETURNS
+ *  current capacity in number of characters.
  */
 qse_size_t qse_str_getcapa (
-	qse_str_t* str /* a dynamic string */
+	qse_str_t* str
 );
+/******/
 
-/*
- * NAME: set new capacity
- *
- * DESCRIPTION:
- *  The qse_str_setcapa() function set new capacity. If the new capacity
+/****f* Common/qse_str_setcapa
+ * NAME
+ *  qse_str_setcapa - set new capacity
+ * DESCRIPTION
+ *  The qse_str_setcapa() function sets the new capacity. If the new capacity
  *  is smaller than the old, the overflowing characters are removed from
  *  from the buffer.
- * 
- * RETURNS: -1 on failure, a new capacity on success 
+ * RETURNS
+ *  (qse_size_t)-1 on failure, new capacity on success 
  */
 qse_size_t qse_str_setcapa (
-	qse_str_t* str  /* a dynamic string */,
-	qse_size_t capa /* a new capacity */
+	qse_str_t* str,
+	qse_size_t capa
 );
+/******/
 
+/****f* Common/qse_str_getlen
+ * NAME
+ *  qse_str_getlen - get length
+ */
+qse_size_t qse_str_getlen (
+	qse_str_t* str
+);
+/******/
+
+/****f* Common/qse_str_setlen
+ * NAME
+ *  qse_str_setlen - change length
+ * RETURNS
+ *  (qse_size_t)-1 on failure, new length on success 
+ */
+qse_size_t qse_str_setlen (
+	qse_str_t* str,
+	qse_size_t len
+);
+/******/
+
+/****f* Common/qse_str_clear
+ * NAME
+ *  qse_str_clear - clear a string
+ * DESCRIPTION
+ *  The qse_str_clear() funtion deletes all characters in a string and sets
+ *  the length to 0. It doesn't resize the internal buffer.
+ */
 void qse_str_clear (
 	qse_str_t* str
 );
+/******/
 
 void qse_str_swap (
 	qse_str_t* str,
diff --git a/qse/lib/cmn/str_dyn.c b/qse/lib/cmn/str_dyn.c
index 36c34035..dbd254f2 100644
--- a/qse/lib/cmn/str_dyn.c
+++ b/qse/lib/cmn/str_dyn.c
@@ -1,5 +1,5 @@
 /*
- * $Id: str_dyn.c 109 2009-03-24 01:44:31Z hyunghwan.chung $
+ * $Id: str_dyn.c 110 2009-03-24 05:52:27Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -159,6 +159,31 @@ qse_size_t qse_str_setcapa (qse_str_t* str, qse_size_t capa)
 	return str->capa;
 }
 
+qse_size_t qse_str_getlen (qse_str_t* str)
+{
+	return QSE_STR_LEN (str);
+}
+
+qse_size_t qse_str_setlen (qse_str_t* str, qse_size_t len)
+{
+	if (len == str->len) return len;
+	if (len < str->len) 
+	{
+		str->len = len;
+		str->ptr[len] = QSE_T('\0');	
+		return len;
+	}
+
+	if (len > str->capa)
+	{
+		if (qse_str_setcapa (str, len) == (qse_size_t)-1) 
+			return (qse_size_t)-1;
+	}
+
+	while (str->len < len) str->ptr[str->len++] = QSE_T(' ');
+	return str->len;
+}
+
 void qse_str_clear (qse_str_t* str)
 {
 	str->len = 0;
diff --git a/qse/lib/utl/sed.c b/qse/lib/utl/sed.c
index 4cb8d9f1..b94e4acd 100644
--- a/qse/lib/utl/sed.c
+++ b/qse/lib/utl/sed.c
@@ -580,11 +580,7 @@ static int get_file_name (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 
 	if (trailing_spaces > 0)
 	{
-		qse_str_delete (
-			t, 
-			QSE_STR_LEN(t) - trailing_spaces,
-			trailing_spaces
-		);
+		qse_str_setlen (t, QSE_STR_LEN(t) - trailing_spaces);
 	}
 
 	qse_str_yield (t, &cmd->u.filename, 0);
diff --git a/qse/test/cmn/str.c b/qse/test/cmn/str.c
index 467c0cf3..a1348702 100644
--- a/qse/test/cmn/str.c
+++ b/qse/test/cmn/str.c
@@ -28,7 +28,19 @@ static int test1 ()
 	qse_printf (QSE_T("LEN=%u CAPA=%u [%.*s]\n"), 
 		(unsigned)QSE_STR_LEN(s1), (unsigned)QSE_STR_CAPA(s1), 
 		(int)QSE_STR_LEN(s1), QSE_STR_PTR(s1));
-		
+
+	qse_printf (QSE_T("LEN=%u\n"),
+		(unsigned int)qse_str_setlen (s1, QSE_STR_LEN(s1)-1));
+	qse_printf (QSE_T("LEN=%u CAPA=%u [%.*s]\n"), 
+		(unsigned)QSE_STR_LEN(s1), (unsigned)QSE_STR_CAPA(s1), 
+		(int)QSE_STR_LEN(s1), QSE_STR_PTR(s1));
+
+	qse_printf (QSE_T("LEN=%u\n"),
+		(unsigned int)qse_str_setlen (s1, QSE_STR_CAPA(s1) + 5));
+	qse_printf (QSE_T("LEN=%u CAPA=%u [%.*s]\n"), 
+		(unsigned)QSE_STR_LEN(s1), (unsigned)QSE_STR_CAPA(s1), 
+		(int)QSE_STR_LEN(s1), QSE_STR_PTR(s1));
+
 	qse_str_close (s1);
 	return 0;
 }
@@ -215,7 +227,11 @@ static int test6 (void)
 		qse_size_t wlen = QSE_COUNTOF(buf);
 		n = qse_mbstowcs (x[i], buf, &wlen);
 
-		qse_printf (QSE_T("[%S]=>"),x[i]);
+	#ifdef QSE_CHAR_IS_MCHAR
+		qse_printf (QSE_T("[%s]=>"), x[i]);
+	#else
+		qse_printf (QSE_T("[%S]=>"), x[i]);
+	#endif
 
 	#ifdef QSE_CHAR_IS_MCHAR
 		qse_printf (QSE_T("[%S] %d chars %d bytes\n"), buf, (int)wlen, (int)n);