1 files changed, 21 insertions, 0 deletions
diff --git a/src/zbits.c b/src/zbits.c
new file mode 100644
index 0000000..07c1591
--- /dev/null
+++ b/src/zbits.c
@@ -0,0 +1,21 @@
+/* See LICENSE file for copyright and license details. */
+#include "internals"
+
+
+size_t
+zbits(z_t a)
+{
+        size_t i;
+        uint32_t x;
+	if (zzero(a)) {
+		return 1;
+	}
+	for (i = a->used - 1;; i--) {
+		x = a->chars[i];
+		if (x) {
+			a->used = i + 1;
+			for (i *= BITS_PER_CHAR; x; x >>= 1, i++);
+			return i;
+		}
+	}
+}