1 files changed, 18 insertions, 0 deletions
diff --git a/src/zbtest.c b/src/zbtest.c
new file mode 100644
index 0000000..8e9f8ff
--- /dev/null
+++ b/src/zbtest.c
@@ -0,0 +1,18 @@
+/* See LICENSE file for copyright and license details. */
+#include "internals"
+
+
+int
+zbtest(z_t a, size_t bit)
+{
+	size_t chars;
+	if (zzero(a))
+		return 0;
+
+	chars = bit >> LB_BITS_PER_CHAR;
+	if (chars >= a->used)
+		return 0;
+
+	bit &= BITS_PER_CHAR - 1;
+	return (a->chars[chars] >> bit) & 1;
+}