+static char *get_default_owner(void)
+{
+ if (strlen(default_owner_str) == 0)
+ strfieldcpy(default_owner_str, "root");
+
+ return default_owner_str;
+}
+
+static char *get_default_group(void)
+{
+ if (strlen(default_group_str) == 0)
+ strfieldcpy(default_group_str, "root");
+
+ return default_group_str;
+}
+
+/* extract possible {attr} and move str behind it */
+static char *get_format_attribute(char **str)
+{
+ char *pos;
+ char *attr = NULL;
+
+ if (*str[0] == '{') {
+ pos = strchr(*str, '}');
+ if (pos == NULL) {
+ dbg("missing closing brace for format");
+ return NULL;
+ }
+ pos[0] = '\0';
+ attr = *str+1;
+ *str = pos+1;
+ dbg("attribute='%s', str='%s'", attr, *str);
+ }
+ return attr;
+}
+
+/* extract possible format length and move str behind it*/
+static int get_format_len(char **str)
+{
+ int num;
+ char *tail;
+
+ if (isdigit(*str[0])) {
+ num = (int) strtoul(*str, &tail, 10);
+ if (num > 0) {
+ *str = tail;
+ dbg("format length=%i", num);
+ return num;
+ } else {
+ dbg("format parsing error '%s'", *str);
+ }
+ }
+ return -1;
+}
+
+/** Finds the lowest positive N such that <name>N isn't present in
+ * $(udevroot) either as a file or a symlink.
+ *
+ * @param name Name to check for
+ * @return 0 if <name> didn't exist and N otherwise.
+ */
+static unsigned int find_free_number (struct udevice *udev, char *name)