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diff --git a/src/util/db.c b/src/util/db.c
new file mode 100755
index 00000000..d048517b
--- /dev/null
+++ b/src/util/db.c
@@ -0,0 +1,31 @@
+#include <stdio.h>      /* printf */
+#include <string.h>     /* strcat */
+#include <stdlib.h>     /* strtol */
+
+const char *byte_to_binary(int x)
+{
+	static char b[9];
+	int z;
+
+	b[0] = '\0';
+	for (z = 128; z > 0; z >>= 1)
+	{
+		strcat(b, ((x & z) == z) ? "1" : "0");
+	}
+	return b;
+}
+
+void main()
+{
+	/* binary string to int */
+	char *tmp;
+	char *b = "1101";
+
+	printf("%d\n", strtol(b, &tmp, 2));
+	printf("%x\n", strtol(b, &tmp, 2));
+
+	/* byte to binary string */
+	printf("%s\n", byte_to_binary(4));
+	printf("%s\n", byte_to_binary(16));
+//    return 0;
+}