page and item selection

src/arr.c

@@ -0,0 +1,13 @@
+#include "arr.h"
+
+unsigned int arr_uint_index_of(UintArray array, unsigned int value) {
+  unsigned int i;
+
+  for (i = 0; i < array.length; i++) {
+    if (array.values[i] == value) {
+      return i;
+    }
+  }
+
+  return ARRAY_NOT_FOUND;
+}