set: add new set_put_strsplit() call

It's like set_put_strdup(), but splits up a string via an extract_first_word()
loop.

src/basic/hashmap.c

@@ -1764,6 +1764,9 @@ void *ordered_hashmap_next(OrderedHashmap *h, const void *key) {
 int set_consume(Set *s, void *value) {
         int r;
 
+        assert(s);
+        assert(value);
+
         r = set_put(s, value);
         if (r <= 0)
                 free(value);
@@ -1791,6 +1794,8 @@ int set_put_strdupv(Set *s, char **l) {
         int n = 0, r;
         char **i;
 
+        assert(s);
+
         STRV_FOREACH(i, l) {
                 r = set_put_strdup(s, *i);
                 if (r < 0)
@@ -1801,3 +1806,23 @@ int set_put_strdupv(Set *s, char **l) {
 
         return n;
 }
+
+int set_put_strsplit(Set *s, const char *v, const char *separators, ExtractFlags flags) {
+        const char *p = v;
+        int r;
+
+        assert(s);
+        assert(v);
+
+        for (;;) {
+                char *word;
+
+                r = extract_first_word(&p, &word, separators, flags);
+                if (r <= 0)
+                        return r;
+
+                r = set_consume(s, word);
+                if (r < 0)
+                        return r;
+        }
+}

src/basic/set.h

@@ -19,6 +19,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include "extract-word.h"
 #include "hashmap.h"
 #include "macro.h"
 
@@ -122,6 +123,7 @@ static inline char **set_get_strv(Set *s) {
 int set_consume(Set *s, void *value);
 int set_put_strdup(Set *s, const char *p);
 int set_put_strdupv(Set *s, char **l);
+int set_put_strsplit(Set *s, const char *v, const char *separators, ExtractFlags flags);
 
 #define SET_FOREACH(e, s, i) \
         for ((i) = ITERATOR_FIRST; set_iterate((s), &(i), (void**)&(e)); )