basic/ordered-set: add functions to operate on OrderedSets of strings

src/basic/ordered-set.c

@@ -45,3 +45,21 @@ int ordered_set_put_strdupv(OrderedSet *s, char **l) {
 
         return n;
 }
+
+int ordered_set_put_string_set(OrderedSet *s, OrderedSet *l) {
+        int n = 0, r;
+        Iterator i;
+        char *p;
+
+        /* Like ordered_set_put_strv, but for an OrderedSet of strings */
+
+        ORDERED_SET_FOREACH(p, l, i) {
+                r = ordered_set_put_strdup(s, p);
+                if (r < 0)
+                        return r;
+
+                n += r;
+        }
+
+        return n;
+}

src/basic/ordered-set.h

@@ -48,9 +48,14 @@ static inline void* ordered_set_steal_first(OrderedSet *s) {
         return ordered_hashmap_steal_first((OrderedHashmap*) s);
 }
 
+static inline char **ordered_set_get_strv(OrderedSet *s) {
+        return internal_hashmap_get_strv(HASHMAP_BASE((OrderedHashmap*) s));
+}
+
 int ordered_set_consume(OrderedSet *s, void *p);
 int ordered_set_put_strdup(OrderedSet *s, const char *p);
 int ordered_set_put_strdupv(OrderedSet *s, char **l);
+int ordered_set_put_string_set(OrderedSet *s, OrderedSet *l);
 
 #define ORDERED_SET_FOREACH(e, s, i)                                    \
         for ((i) = ITERATOR_FIRST; ordered_set_iterate((s), &(i), (void**)&(e)); )