1 files changed, 21 insertions, 0 deletions
diff --git a/src/zlsb.c b/src/zlsb.c
new file mode 100644
index 0000000..610b32f
--- /dev/null
+++ b/src/zlsb.c
@@ -0,0 +1,21 @@
+/* See LICENSE file for copyright and license details. */
+#include "internals"
+
+
+size_t
+zlsb(z_t a)
+{
+        size_t i = 0;
+        uint32_t x;
+	if (zzero(a)) {
+		return SIZE_MAX;
+	}
+	for (;; i++) {
+		x = a->chars[i];
+		if (x) {
+		  	x = ~x;
+			for (i *= BITS_PER_CHAR; x & 1; x >>= 1, i++);
+			return i;
+		}
+	}
+}