/*
- * Copyright (c) 2011, 2012 Nicira, Inc.
+ * Copyright (c) 2011, 2012, 2013, 2015 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
hmap_node = hmap_at_position(&set->map, bucketp, offsetp);
return SSET_NODE_FROM_HMAP_NODE(hmap_node);
}
+
+/* Replaces 'a' by the intersection of 'a' and 'b'. That is, removes from 'a'
+ * all of the strings that are not also in 'b'. */
+void
+sset_intersect(struct sset *a, const struct sset *b)
+{
+ const char *name, *next;
+
+ SSET_FOR_EACH_SAFE (name, next, a) {
+ if (!sset_contains(b, name)) {
+ sset_delete(a, SSET_NODE_FROM_NAME(name));
+ }
+ }
+}
+
+/* Returns a null-terminated array of pointers to the strings in 'set', in no
+ * particular order. The caller must free the returned array when it is no
+ * longer needed, but the strings in the array belong to 'set' and thus must
+ * not be modified or freed. */
+const char **
+sset_array(const struct sset *set)
+{
+ size_t n = sset_count(set);
+ const char **array;
+ const char *s;
+ size_t i;
+
+ array = xmalloc(sizeof *array * (n + 1));
+ i = 0;
+ SSET_FOR_EACH (s, set) {
+ array[i++] = s;
+ }
+ ovs_assert(i == n);
+ array[n] = NULL;
+
+ return array;
+}
+
+static int
+compare_string_pointers(const void *a_, const void *b_)
+{
+ const char *const *a = a_;
+ const char *const *b = b_;
+
+ return strcmp(*a, *b);
+}
+
+/* Returns a null-terminated array of pointers to the strings in 'set', sorted
+ * alphabetically. The caller must free the returned array when it is no
+ * longer needed, but the strings in the array belong to 'set' and thus must
+ * not be modified or freed. */
+const char **
+sset_sort(const struct sset *set)
+{
+ const char **array = sset_array(set);
+ qsort(array, sset_count(set), sizeof *array, compare_string_pointers);
+ return array;
+}