+int strv_extend(char ***l, const char *value) {
+ char **c;
+ char *v;
+ unsigned n;
+
+ if (!value)
+ return 0;
+
+ v = strdup(value);
+ if (!v)
+ return -ENOMEM;
+
+ n = strv_length(*l);
+ c = realloc(*l, sizeof(char*) * (n + 2));
+ if (!c) {
+ free(v);
+ return -ENOMEM;
+ }
+
+ c[n] = v;
+ c[n+1] = NULL;
+
+ *l = c;
+ return 0;
+}
+