diff --git a/qse/cmd/awk/awk.c b/qse/cmd/awk/awk.c
index 674f59d3..ea442718 100644
--- a/qse/cmd/awk/awk.c
+++ b/qse/cmd/awk/awk.c
@@ -1,5 +1,5 @@
 /*
- * $Id: awk.c 85 2009-02-26 10:56:12Z hyunghwan.chung $
+ * $Id: awk.c 86 2009-02-26 12:55:05Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -644,7 +644,7 @@ static int awk_main (int argc, qse_char_t* argv[])
 	rcb.data = &ao;
 
 	rtx = qse_awk_rtx_openstd (
-		awk, ao.icf, QSE_AWK_RTX_OPENSTD_STDIO);
+		awk, 0, ao.icf, QSE_AWK_RTX_OPENSTD_STDIO);
 	if (rtx == QSE_NULL) 
 	{
 		qse_printf (
diff --git a/qse/include/qse/awk/std.h b/qse/include/qse/awk/std.h
index 6218fe58..89a81f43 100644
--- a/qse/include/qse/awk/std.h
+++ b/qse/include/qse/awk/std.h
@@ -1,5 +1,5 @@
 /*
- * $Id: std.h 85 2009-02-26 10:56:12Z hyunghwan.chung $
+ * $Id: std.h 86 2009-02-26 12:55:05Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -138,16 +138,26 @@ int qse_awk_parsestd (
  *  The caller should keep the contents of icf and ocf valid throughout
  *  the lifetime of the runtime context created. The runtime context 
  *  remembers the pointers without copying in the contents.
- *
  * SYNOPSIS
  */
 qse_awk_rtx_t* qse_awk_rtx_openstd (
 	qse_awk_t*             awk,
+	qse_size_t             xtnsize,
 	const qse_char_t*const icf[],
 	const qse_char_t*const ocf[]
 );
 /******/
 
+/****f* AWK/qse_awk_rtx_getxtnstd
+ * NAME
+ *  qse_awk_rtx_getxtnstd - get the pointer to extension space
+ * SYNOPSIS
+ */
+void* qse_awk_rtx_getxtnstd (
+	qse_awk_rtx_t* rtx
+);
+/******/
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/qse/lib/awk/std.c b/qse/lib/awk/std.c
index a85b4bde..148ed322 100644
--- a/qse/lib/awk/std.c
+++ b/qse/lib/awk/std.c
@@ -1,5 +1,5 @@
 /*
- * $Id: std.c 85 2009-02-26 10:56:12Z hyunghwan.chung $
+ * $Id: std.c 86 2009-02-26 12:55:05Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -881,6 +881,7 @@ static qse_ssize_t awk_rio_console (
 
 qse_awk_rtx_t* qse_awk_rtx_openstd (
 	qse_awk_t* awk,
+	qse_size_t xtnsize,
 	const qse_char_t*const icf[],
 	const qse_char_t*const ocf[])
 {
@@ -895,7 +896,7 @@ qse_awk_rtx_t* qse_awk_rtx_openstd (
 
 	rtx = qse_awk_rtx_open (
 		awk, 
-		QSE_SIZEOF(rxtn_t),
+		QSE_SIZEOF(rxtn_t) + xtnsize,
 		&rio,
 		QSE_NULL/*runarg*/
 	);
@@ -916,6 +917,11 @@ qse_awk_rtx_t* qse_awk_rtx_openstd (
 	return rtx;
 }
 
+void* qse_awk_rtx_getxtnstd (qse_awk_rtx_t* rtx)
+{
+	return (void*)((rxtn_t*)QSE_XTN(rtx) + 1);
+}
+
 /*** EXTRA BUILTIN FUNCTIONS ***/
 enum
 {
diff --git a/qse/test/awk/awk01.c b/qse/test/awk/awk01.c
index 73c6b90b..b73048a0 100644
--- a/qse/test/awk/awk01.c
+++ b/qse/test/awk/awk01.c
@@ -1,5 +1,5 @@
 /*
- * $Id: awk01.c 85 2009-02-26 10:56:12Z hyunghwan.chung $ 
+ * $Id: awk01.c 86 2009-02-26 12:55:05Z hyunghwan.chung $ 
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -63,7 +63,7 @@ int main ()
 	}
 
 	rtx = qse_awk_rtx_openstd (
-		awk, 
+		awk, 0,
 		QSE_NULL,                 /* no console input */
 		QSE_AWK_RTX_OPENSTD_STDIO /* stdout for console output */
 	);
diff --git a/qse/test/awk/awk02.c b/qse/test/awk/awk02.c
index 31559892..16582958 100644
--- a/qse/test/awk/awk02.c
+++ b/qse/test/awk/awk02.c
@@ -1,5 +1,5 @@
 /*
- * $Id: awk02.c 85 2009-02-26 10:56:12Z hyunghwan.chung $ 
+ * $Id: awk02.c 86 2009-02-26 12:55:05Z hyunghwan.chung $ 
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -78,7 +78,7 @@ int main ()
 	qse_fflush (QSE_STDOUT);
 
 	rtx = qse_awk_rtx_openstd (
-		awk, 
+		awk, 0,
 		QSE_NULL,                 /* no console input */
 		QSE_AWK_RTX_OPENSTD_STDIO /* stdout for console output */
 	);
diff --git a/qse/test/awk/awk03.c b/qse/test/awk/awk03.c
index 60d2f0c6..e7162a65 100644
--- a/qse/test/awk/awk03.c
+++ b/qse/test/awk/awk03.c
@@ -1,5 +1,5 @@
 /*
- * $Id: awk03.c 85 2009-02-26 10:56:12Z hyunghwan.chung $
+ * $Id: awk03.c 86 2009-02-26 12:55:05Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -77,7 +77,7 @@ int main ()
 
 	/* create a runtime context */
 	rtx = qse_awk_rtx_openstd (
-		awk, 
+		awk, 0,
 		QSE_NULL,                  /* no console input */
 		QSE_AWK_RTX_OPENSTD_STDIO  /* stdout for console output */
 	);
diff --git a/qse/test/awk/awk04.c b/qse/test/awk/awk04.c
index 91be4c5a..3b38fa0d 100644
--- a/qse/test/awk/awk04.c
+++ b/qse/test/awk/awk04.c
@@ -1,5 +1,5 @@
 /*
- * $Id: awk04.c 85 2009-02-26 10:56:12Z hyunghwan.chung $
+ * $Id: awk04.c 86 2009-02-26 12:55:05Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -67,7 +67,7 @@ int main ()
 
 	/* create a runtime context */
 	rtx = qse_awk_rtx_openstd (
-		awk, 
+		awk, 0,
 		QSE_NULL,                  /* no console input */
 		QSE_AWK_RTX_OPENSTD_STDIO  /* stdout for console output */
 	);