- va_start (ap, format);
- vsnprintf (buffer, sizeof (buffer), format, ap);
- va_end (ap);
+static data_source_t magic_ds[] = {{"value", DS_TYPE_DERIVE, 0.0, NAN}};
+static data_set_t magic = {"MAGIC", 1, magic_ds};
+const data_set_t *plugin_get_ds(const char *name) {
+ if (strcmp(name, "MAGIC"))
+ return NULL;