1 files changed, 4 insertions, 0 deletions
diff --git a/bits.h b/bits.h
index 326329de..f4df6002 100644
--- a/bits.h
+++ b/bits.h
@@ -15,6 +15,10 @@
 #define _GPSD_BITS_H_
 
 #include <stdint.h>
+#include <limits.h>
+
+/* number of bytes requited to contain a bit array of specified length */
+#define BITS_TO_BYTES(bitlen)	(((bitlen) + CHAR_BIT - 1) / CHAR_BIT)
 
 /* these are independent of byte order */
 #define getsb(buf, off)	((int8_t)buf[off])