+/* Robust bit test/set/reset macros */
+#define _NOTMUCH_VALID_BIT(bit) \
+ ((bit) >= 0 && ((unsigned long) bit) < CHAR_BIT * sizeof (unsigned long long))
+#define NOTMUCH_TEST_BIT(val, bit) \
+ (_NOTMUCH_VALID_BIT(bit) ? !!((val) & (1ull << (bit))) : 0)
+#define NOTMUCH_SET_BIT(valp, bit) \
+ (_NOTMUCH_VALID_BIT(bit) ? (*(valp) |= (1ull << (bit))) : *(valp))
+#define NOTMUCH_CLEAR_BIT(valp, bit) \
+ (_NOTMUCH_VALID_BIT(bit) ? (*(valp) &= ~(1ull << (bit))) : *(valp))
+