usteer: Initial import

Signed-off-by: Felix Fietkau <nbd@nbd.name>

node.c

@@ -0,0 +1,38 @@
+/*
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License.
+ *
+ *   This program 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 General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *   Copyright (C) 2020 embedd.ch 
+ *   Copyright (C) 2020 Felix Fietkau <nbd@nbd.name> 
+ *   Copyright (C) 2020 John Crispin <john@phrozen.org> 
+ */
+
+#include "usteer.h"
+
+void usteer_node_set_blob(struct blob_attr **dest, struct blob_attr *val)
+{
+	int new_len;
+	int len;
+
+	if (!val) {
+		free(*dest);
+		*dest = NULL;
+		return;
+	}
+
+	len = *dest ? blob_pad_len(*dest) : 0;
+	new_len = blob_pad_len(val);
+	if (new_len != len)
+		*dest = realloc(*dest, new_len);
+	memcpy(*dest, val, new_len);
+}