1 files changed, 57 insertions, 0 deletions
diff --git a/km-rand-src.c b/km-rand-src.c
new file mode 100644
index 0000000..0ddc1bb
--- /dev/null
+++ b/km-rand-src.c
@@ -0,0 +1,57 @@
+#include <stdbool.h>
+#include "util.h"
+#include "km.h"
+
+// fill buffer with N random floats
+bool
+km_rand_src_fill(
+  km_rand_src_t * const rs,
+  const size_t num_floats,
+  float * const floats
+) {
+  return rs->cbs->fill(rs, num_floats, floats);
+}
+
+// finalize random source
+void
+km_rand_src_fini(
+  km_rand_src_t * const rs
+) {
+  if (rs->cbs->fini) {
+    rs->cbs->fini(rs);
+  }
+}
+
+// fill callback for system random source
+static bool
+rand_src_system_on_fill(
+  km_rand_src_t * const rs,
+  const size_t num_floats,
+  float * const floats
+) {
+  UNUSED(rs);
+
+  // generate random cluster centers
+  for (size_t i = 0; i < num_floats; i++) {
+    floats[i] = 1.0 * rand() / RAND_MAX;
+  }
+
+  // return success
+  return true;
+}
+
+// system random source callbacks
+static const km_rand_src_cbs_t
+RAND_SRC_SYSTEM_CBS = {
+  .fill = rand_src_system_on_fill,
+  .fini = NULL,
+};
+
+// init system random source (uses system rand())
+void
+km_rand_src_system_init(
+  km_rand_src_t * const rs
+) {
+  rs->cbs = &RAND_SRC_SYSTEM_CBS;
+  rs->data = NULL;
+}