From http://www.jwz.org/xscreensaver/xscreensaver-5.37.tar.gz

[xscreensaver] / utils / pow2.h

diff --git a/utils/pow2.h b/utils/pow2.h
new file mode 100644 (file)
index 0000000..3927e84
--- /dev/null
+++ b/utils/pow2.h
@@ -0,0 +1,20 @@
+/* pow2, Copyright (c) 2016 Dave Odell <dmo2118@gmail.com>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or
+ * implied warranty.
+ */
+
+#ifndef POW2_H
+#define POW2_H
+
+#include <stdlib.h>
+
+extern int i_log2(size_t x);
+extern size_t to_pow2 (size_t x); /* return the next larger power of 2. */
+
+#endif /* POW2_H */