diff --git a/qse/include/qse/cmn/nwad.h b/qse/include/qse/cmn/nwad.h
index f19738dd..e57695c1 100644
--- a/qse/include/qse/cmn/nwad.h
+++ b/qse/include/qse/cmn/nwad.h
@@ -95,6 +95,15 @@ int qse_nwadequal (
 	const qse_nwad_t* y
 );
 
+/**
+ * The qse_clearnwad() function zeros out the address
+ * for the address @a type. 
+ */
+void qse_clearnwad (
+	qse_nwad_t*     nwad,
+	qse_nwad_type_t type
+);
+
 int qse_mbstonwad (
 	const qse_mchar_t* mbs,
 	qse_nwad_t*        nwad
diff --git a/qse/include/qse/cmn/nwif.h b/qse/include/qse/cmn/nwif.h
index 8c414b55..8813d04b 100644
--- a/qse/include/qse/cmn/nwif.h
+++ b/qse/include/qse/cmn/nwif.h
@@ -37,8 +37,8 @@ enum qse_nwifcfg_flag_t
 
 enum qse_nwifcfg_type_t
 {
-	QSE_NWIFCFG_IN4,
-	QSE_NWIFCFG_IN6
+	QSE_NWIFCFG_IN4 = QSE_NWAD_IN4,
+	QSE_NWIFCFG_IN6 = QSE_NWAD_IN6
 };
 
 typedef enum qse_nwifcfg_type_t qse_nwifcfg_type_t;
diff --git a/qse/lib/cmn/nwad.c b/qse/lib/cmn/nwad.c
index 357c8f7d..16d42e76 100644
--- a/qse/lib/cmn/nwad.c
+++ b/qse/lib/cmn/nwad.c
@@ -46,6 +46,12 @@ int qse_nwadequal (const qse_nwad_t* x, const qse_nwad_t* y)
 	}
 }
 
+void qse_clearnwad (qse_nwad_t* nwad, qse_nwad_type_t type)
+{
+	QSE_MEMSET (nwad,  0, QSE_SIZEOF(*nwad));
+	nwad->type = type;
+}
+
 int qse_mbstonwad (const qse_mchar_t* str, qse_nwad_t* nwad)
 {
 	return qse_mbsntonwad (str, qse_mbslen(str), nwad);
diff --git a/qse/lib/cmn/nwif-cfg.c b/qse/lib/cmn/nwif-cfg.c
index 58a7e3a6..0e413c35 100644
--- a/qse/lib/cmn/nwif-cfg.c
+++ b/qse/lib/cmn/nwif-cfg.c
@@ -299,26 +299,28 @@ static int get_nwifcfg (int s, qse_nwifcfg_t* cfg)
 	if (ioctl (s, SIOCGLIFMTU, &lifrbuf) <= -1) return -1;
 	cfg->mtu = lifrbuf.lifr_mtu;
 	
-	if (ioctl (s, SIOCGLIFADDR, &lifrbuf) <= -1) return -1;
-	qse_skadtonwad (&lifrbuf.lifr_addr, &cfg->addr);
+	qse_clearnwad (&cfg->addr, cfg->type);
+	qse_clearnwad (&cfg->mask, cfg->type);
+	qse_clearnwad (&cfg->bcast, cfg->type);
+	qse_clearnwad (&cfg->ptop, cfg->type);
+	QSE_MEMSET (cfg->ethw, 0, QSE_SIZEOF(cfg->ethw));
 
-	if (ioctl (s, SIOCGLIFNETMASK, &lifrbuf) <= -1) return -1;
-	qse_skadtonwad (&lifrbuf.lifr_addr, &cfg->mask);
+	if (ioctl (s, SIOCGLIFADDR, &lifrbuf) >= 0) 
+		qse_skadtonwad (&lifrbuf.lifr_addr, &cfg->addr);
 
-	if (cfg->flags & QSE_NWIFCFG_BCAST)
+	if (ioctl (s, SIOCGLIFNETMASK, &lifrbuf) >= 0) 
+		qse_skadtonwad (&lifrbuf.lifr_addr, &cfg->mask);
+
+	if ((cfg->flags & QSE_NWIFCFG_BCAST) &&
+	    ioctl (s, SIOCGLIFBRDADDR, &lifrbuf) >= 0)
 	{
-		if (ioctl (s, SIOCGLIFBRDADDR, &lifrbuf) <= -1) return -1;
 		qse_skadtonwad (&lifrbuf.lifr_broadaddr, &cfg->bcast);
 	}
-	else QSE_MEMSET (&cfg->bcast, 0, QSE_SIZEOF(cfg->bcast));
-	if (cfg->flags & QSE_NWIFCFG_PTOP)
+	if ((cfg->flags & QSE_NWIFCFG_PTOP) &&
+	    ioctl (s, SIOCGLIFDSTADDR, &lifrbuf) >= 0)
 	{
-		if (ioctl (s, SIOCGLIFDSTADDR, &lifrbuf) <= -1) return -1;
 		qse_skadtonwad (&lifrbuf.lifr_dstaddr, &cfg->ptop);
 	}
-	else QSE_MEMSET (&cfg->ptop, 0, QSE_SIZEOF(cfg->ptop));
-
-	QSE_MEMSET (cfg->ethw, 0, QSE_SIZEOF(cfg->ethw));
 
 	#if defined(SIOCGENADDR)
 	{
@@ -385,44 +387,46 @@ static int get_nwifcfg (int s, qse_nwifcfg_t* cfg)
 	cfg->mtu = ifrbuf.ifr_metric; 
 	#endif
 	
+	qse_clearnwad (&cfg->addr, cfg->type);
+	qse_clearnwad (&cfg->mask, cfg->type);
+	qse_clearnwad (&cfg->bcast, cfg->type);
+	qse_clearnwad (&cfg->ptop, cfg->type);
+	QSE_MEMSET (cfg->ethw, 0, QSE_SIZEOF(cfg->ethw));
+
 	if (cfg->type == QSE_NWIFCFG_IN6)
 	{
-		if (ioctl (s, SIOCGLIFADDR, &iflrbuf) <= -1) return -1;
-		qse_skadtonwad (&iflrbuf.addr, &cfg->addr);
+		if (ioctl (s, SIOCGLIFADDR, &iflrbuf) >= 0) 
+		{
+			qse_skadtonwad (&iflrbuf.addr, &cfg->addr);
 
-		QSE_MEMSET (&cfg->mask, 0, QSE_SIZEOF(cfg->mask));
-		cfg->mask.type = QSE_NWAD_IN6;
-		qse_prefixtoip6ad (iflrbuf.prefixlen, &cfg->mask.u.in6.addr);
+			cfg->mask.type = QSE_NWAD_IN6;
+			qse_prefixtoip6ad (iflrbuf.prefixlen, &cfg->mask.u.in6.addr);
 
-		QSE_MEMSET (&cfg->bcast, 0, QSE_SIZEOF(cfg->bcast));
-		if (cfg->flags & QSE_NWIFCFG_PTOP)
-			qse_skadtonwad (&iflrbuf.dstaddr, &cfg->ptop);
-		else QSE_MEMSET (&cfg->ptop, 0, QSE_SIZEOF(cfg->ptop));
+			if (cfg->flags & QSE_NWIFCFG_PTOP)
+				qse_skadtonwad (&iflrbuf.dstaddr, &cfg->ptop);
+		}
 	}
 	else
 	{
-		if (ioctl (s, SIOCGIFADDR, &ifrbuf) <= -1) return -1;
-		qse_skadtonwad (&ifrbuf.ifr_addr, &cfg->addr);
+		if (ioctl (s, SIOCGIFADDR, &ifrbuf) >= 0)
+			qse_skadtonwad (&ifrbuf.ifr_addr, &cfg->addr);
 
-		if (ioctl (s, SIOCGIFNETMASK, &ifrbuf) <= -1) return -1;
-		qse_skadtonwad (&ifrbuf.ifr_addr, &cfg->mask);
+		if (ioctl (s, SIOCGIFNETMASK, &ifrbuf) >= 0)
+			qse_skadtonwad (&ifrbuf.ifr_addr, &cfg->mask);
 
-		if (cfg->flags & QSE_NWIFCFG_BCAST)
+		if ((cfg->flags & QSE_NWIFCFG_BCAST) &&
+		    ioctl (s, SIOCGIFBRDADDR, &ifrbuf) >= 0) 
 		{
-			if (ioctl (s, SIOCGIFBRDADDR, &ifrbuf) <= -1) return -1;
 			qse_skadtonwad (&ifrbuf.ifr_broadaddr, &cfg->bcast);
 		}
-		else QSE_MEMSET (&cfg->bcast, 0, QSE_SIZEOF(cfg->bcast));
 
-		if (cfg->flags & QSE_NWIFCFG_PTOP)
+		if ((cfg->flags & QSE_NWIFCFG_PTOP) &&
+		    ioctl (s, SIOCGIFDSTADDR, &ifrbuf) >= 0) 
 		{
-			if (ioctl (s, SIOCGIFDSTADDR, &ifrbuf) <= -1) return -1;
 			qse_skadtonwad (&ifrbuf.ifr_dstaddr, &cfg->ptop);
 		}
-		else QSE_MEMSET (&cfg->ptop, 0, QSE_SIZEOF(cfg->ptop));
 	}
 
-	QSE_MEMSET (cfg->ethw, 0, QSE_SIZEOF(cfg->ethw));
 	#if defined(CTL_NET) && defined(AF_ROUTE) && defined(AF_LINK)
 	{
 		int mib[6];
@@ -501,28 +505,31 @@ static int get_nwifcfg (int s, qse_nwifcfg_t* cfg)
 	 * the MTU field, and uses ifr_metric instead */
 	cfg->mtu = ifrbuf.ifr_metric; 
 	#endif
+
+	qse_clearnwad (&cfg->addr, cfg->type);
+	qse_clearnwad (&cfg->mask, cfg->type);
+	qse_clearnwad (&cfg->bcast, cfg->type);
+	qse_clearnwad (&cfg->ptop, cfg->type);
+	QSE_MEMSET (cfg->ethw, 0, QSE_SIZEOF(cfg->ethw));
 	
-	if (ioctl (s, SIOCGIFADDR, &ifrbuf) <= -1) return -1;
-	qse_skadtonwad (&ifrbuf.ifr_addr, &cfg->addr);
+	if (ioctl (s, SIOCGIFADDR, &ifrbuf) >= 0)
+		qse_skadtonwad (&ifrbuf.ifr_addr, &cfg->addr);
+		
+	if (ioctl (s, SIOCGIFNETMASK, &ifrbuf) >= 0)
+		qse_skadtonwad (&ifrbuf.ifr_addr, &cfg->mask);
 
-	if (ioctl (s, SIOCGIFNETMASK, &ifrbuf) <= -1) return -1;
-	qse_skadtonwad (&ifrbuf.ifr_addr, &cfg->mask);
-
-	if (cfg->flags & QSE_NWIFCFG_BCAST)
+	if ((cfg->flags & QSE_NWIFCFG_BCAST) &&
+	    ioctl (s, SIOCGIFBRDADDR, &ifrbuf) >= 0)
 	{
-		if (ioctl (s, SIOCGIFBRDADDR, &ifrbuf) <= -1) return -1;
 		qse_skadtonwad (&ifrbuf.ifr_broadaddr, &cfg->bcast);
 	}
-	else QSE_MEMSET (&cfg->bcast, 0, QSE_SIZEOF(cfg->bcast));
 
-	if (cfg->flags & QSE_NWIFCFG_PTOP)
+	if ((cfg->flags & QSE_NWIFCFG_PTOP) &&
+	    ioctl (s, SIOCGIFDSTADDR, &ifrbuf) >= 0)
 	{
-		if (ioctl (s, SIOCGIFDSTADDR, &ifrbuf) <= -1) return -1;
 		qse_skadtonwad (&ifrbuf.ifr_dstaddr, &cfg->ptop);
 	}
-	else QSE_MEMSET (&cfg->ptop, 0, QSE_SIZEOF(cfg->ptop));
 
-	QSE_MEMSET (cfg->ethw, 0, QSE_SIZEOF(cfg->ethw));
 	#if defined(SIOCGIFHWADDR)
 	if (ioctl (s, SIOCGIFHWADDR, &ifrbuf) >= 0)
 	{ 
@@ -546,9 +553,7 @@ static int get_nwifcfg (int s, qse_nwifcfg_t* cfg)
 			strioc.ic_len = QSE_SIZEOF (buf);
 			strioc.ic_dp = buf;
 			if (ioctl (strfd, I_STR, (char *) &strioc) >= 0) 
-			{
 				QSE_MEMCPY (cfg->ethw, buf, QSE_SIZEOF(cfg->ethw));
-			}
 
 			QSE_CLOSE (strfd);
 		}
diff --git a/qse/mod/awk/uci.c b/qse/mod/awk/uci.c
index d41ff237..02002e1d 100644
--- a/qse/mod/awk/uci.c
+++ b/qse/mod/awk/uci.c
@@ -411,6 +411,18 @@ static int setsavedir_byid (
 	return -x;
 }
 
+static int adddeltapath_byid (
+	qse_awk_rtx_t* rtx, uctx_list_t* list, qse_long_t id, qse_mchar_t* path)
+{
+	int x = UCI_ERR_INVAL;
+
+	if (id >= 0 && id < list->map.high && list->map.tab[id]) 
+	{
+		x = uci_add_delta_path (list->map.tab[id]->ctx, path);
+	}
+	
+	return -x;
+}
 
 static int getsection_byid (
 	qse_awk_rtx_t* rtx, uctx_list_t* list, qse_long_t id,
@@ -1147,6 +1159,43 @@ static int fnc_uci_setsavedir  (qse_awk_rtx_t* rtx, const qse_awk_fnc_info_t* fi
 	return 0;
 }
 
+static int fnc_uci_adddeltapath  (qse_awk_rtx_t* rtx, const qse_awk_fnc_info_t* fi)
+{
+	uctx_list_t* list;
+	qse_awk_val_t* retv;
+	qse_long_t id;
+	int ret;
+	
+	list = rtx_to_list (rtx, fi);
+
+	ret = qse_awk_rtx_valtolong (rtx, qse_awk_rtx_getarg (rtx, 0), &id);
+	if (ret <= -1) ret = -UCI_ERR_INVAL;
+	else
+	{
+		qse_mchar_t* item;
+
+		item = qse_awk_rtx_valtombsdup (rtx, qse_awk_rtx_getarg(rtx, 1), QSE_NULL);
+		if (item)
+		{
+			ret = adddeltapath_byid (rtx, list, id, item);
+			qse_awk_rtx_freemem (rtx, item);
+		}
+		else ret = -UCI_ERR_MEM;
+	}
+
+	if (ret <= -1) 
+	{
+		list->errnum = -ret;
+		ret = -1;
+	}
+
+	retv = qse_awk_rtx_makeintval (rtx, ret);
+	if (retv == QSE_NULL) return -1;
+
+	qse_awk_rtx_setretval (rtx, retv);
+	return 0;
+}
+
 static int fnc_uci_getoption (qse_awk_rtx_t* rtx, const qse_awk_fnc_info_t* fi)
 {
 	uctx_list_t* list;
@@ -1228,24 +1277,25 @@ struct fnctab_t
 
 static fnctab_t fnctab[] =
 {
-	{ QSE_T("addlist"),     { { 2, 2, QSE_NULL }, fnc_uci_addlist,    0 } },
-	{ QSE_T("addsection"),  { { 3, 3, QSE_NULL }, fnc_uci_addsection, 0 } },
-	{ QSE_T("close"),       { { 1, 1, QSE_NULL }, fnc_uci_close,      0 } },
-	{ QSE_T("commit"),      { { 2, 2, QSE_NULL }, fnc_uci_commit,     0 } },
-	{ QSE_T("delete"),      { { 2, 2, QSE_NULL }, fnc_uci_delete,     0 } },
-	{ QSE_T("errno"),       { { 0, 0, QSE_NULL }, fnc_uci_errno,      0 } },
-	{ QSE_T("errstr"),      { { 0, 1, QSE_NULL }, fnc_uci_errstr,     0 } },
-	{ QSE_T("getoption"),   { { 2, 2, QSE_NULL }, fnc_uci_getoption,  0 } },
-	{ QSE_T("getsection"),  { { 2, 2, QSE_NULL }, fnc_uci_getsection, 0 } },
-	{ QSE_T("load"),        { { 2, 2, QSE_NULL }, fnc_uci_load,       0 } },
-	{ QSE_T("open"),        { { 0, 0, QSE_NULL }, fnc_uci_open,       0 } },
-	{ QSE_T("rename"),      { { 2, 2, QSE_NULL }, fnc_uci_rename,     0 } },
-	{ QSE_T("revert"),      { { 2, 2, QSE_NULL }, fnc_uci_revert,     0 } },
-	{ QSE_T("save"),        { { 2, 2, QSE_NULL }, fnc_uci_save,       0 } },
-	{ QSE_T("set"),         { { 2, 2, QSE_NULL }, fnc_uci_set,        0 } }, 
-	{ QSE_T("setconfdir"),  { { 2, 2, QSE_NULL }, fnc_uci_setconfdir, 0 } }, 
-	{ QSE_T("setsavedir"),  { { 2, 2, QSE_NULL }, fnc_uci_setsavedir, 0 } }, 
-	{ QSE_T("unload"),      { { 1, 1, QSE_NULL }, fnc_uci_unload,     0 } }
+	{ QSE_T("adddeltapath"), { { 2, 2, QSE_NULL }, fnc_uci_adddeltapath, 0 } },
+	{ QSE_T("addlist"),      { { 2, 2, QSE_NULL }, fnc_uci_addlist,      0 } },
+	{ QSE_T("addsection"),   { { 3, 3, QSE_NULL }, fnc_uci_addsection,   0 } },
+	{ QSE_T("close"),        { { 1, 1, QSE_NULL }, fnc_uci_close,        0 } },
+	{ QSE_T("commit"),       { { 2, 2, QSE_NULL }, fnc_uci_commit,       0 } },
+	{ QSE_T("delete"),       { { 2, 2, QSE_NULL }, fnc_uci_delete,       0 } },
+	{ QSE_T("errno"),        { { 0, 0, QSE_NULL }, fnc_uci_errno,        0 } },
+	{ QSE_T("errstr"),       { { 0, 1, QSE_NULL }, fnc_uci_errstr,       0 } },
+	{ QSE_T("getoption"),    { { 2, 2, QSE_NULL }, fnc_uci_getoption,    0 } },
+	{ QSE_T("getsection"),   { { 2, 2, QSE_NULL }, fnc_uci_getsection,   0 } },
+	{ QSE_T("load"),         { { 2, 2, QSE_NULL }, fnc_uci_load,         0 } },
+	{ QSE_T("open"),         { { 0, 0, QSE_NULL }, fnc_uci_open,         0 } },
+	{ QSE_T("rename"),       { { 2, 2, QSE_NULL }, fnc_uci_rename,       0 } },
+	{ QSE_T("revert"),       { { 2, 2, QSE_NULL }, fnc_uci_revert,       0 } },
+	{ QSE_T("save"),         { { 2, 2, QSE_NULL }, fnc_uci_save,         0 } },
+	{ QSE_T("set"),          { { 2, 2, QSE_NULL }, fnc_uci_set,          0 } }, 
+	{ QSE_T("setconfdir"),   { { 2, 2, QSE_NULL }, fnc_uci_setconfdir,   0 } }, 
+	{ QSE_T("setsavedir"),   { { 2, 2, QSE_NULL }, fnc_uci_setsavedir,   0 } }, 
+	{ QSE_T("unload"),       { { 1, 1, QSE_NULL }, fnc_uci_unload,       0 } }
 };
 
 /* ------------------------------------------------------------------------ */