+static void strv_free_free(char ***l) {
+ char ***i;
+
+ if (!l)
+ return;
+
+ for (i = l; *i; i++)
+ strv_free(*i);
+
+ free(l);
+}
+
+static void free_join_controllers(void) {
+ if (!arg_join_controllers)
+ return;
+
+ strv_free_free(arg_join_controllers);
+ arg_join_controllers = NULL;
+}
+
+static int config_parse_join_controllers(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ unsigned n = 0;
+ char *state, *w;
+ size_t length;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ free_join_controllers();
+
+ FOREACH_WORD_QUOTED(w, length, rvalue, state) {
+ char *s, **l;
+
+ s = strndup(w, length);
+ if (!s)
+ return -ENOMEM;
+
+ l = strv_split(s, ",");
+ free(s);
+
+ strv_uniq(l);
+
+ if (strv_length(l) <= 1) {
+ strv_free(l);
+ continue;
+ }
+
+ if (!arg_join_controllers) {
+ arg_join_controllers = new(char**, 2);
+ if (!arg_join_controllers) {
+ strv_free(l);
+ return -ENOMEM;
+ }
+
+ arg_join_controllers[0] = l;
+ arg_join_controllers[1] = NULL;
+
+ n = 1;
+ } else {
+ char ***a;
+ char ***t;
+
+ t = new0(char**, n+2);
+ if (!t) {
+ strv_free(l);
+ return -ENOMEM;
+ }
+
+ n = 0;
+
+ for (a = arg_join_controllers; *a; a++) {
+
+ if (strv_overlap(*a, l)) {
+ char **c;
+
+ c = strv_merge(*a, l);
+ if (!c) {
+ strv_free(l);
+ strv_free_free(t);
+ return -ENOMEM;
+ }
+
+ strv_free(l);
+ l = c;
+ } else {
+ char **c;
+
+ c = strv_copy(*a);
+ if (!c) {
+ strv_free(l);
+ strv_free_free(t);
+ return -ENOMEM;
+ }
+
+ t[n++] = c;
+ }
+ }
+
+ t[n++] = strv_uniq(l);
+
+ strv_free_free(arg_join_controllers);
+ arg_join_controllers = t;
+ }
+ }
+
+ return 0;
+}
+