diff options
Diffstat (limited to 'lib/libnetbsd/sys/cdefs.h')
| -rw-r--r-- | lib/libnetbsd/sys/cdefs.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/libnetbsd/sys/cdefs.h b/lib/libnetbsd/sys/cdefs.h index 051959f..06e46fd 100644 --- a/lib/libnetbsd/sys/cdefs.h +++ b/lib/libnetbsd/sys/cdefs.h @@ -69,4 +69,13 @@ */ #define __arraycount(__x) (sizeof(__x) / sizeof(__x[0])) +/* __BIT(n): nth bit, where __BIT(0) == 0x1. */ +#define __BIT(__n) \ + (((uintmax_t)(__n) >= NBBY * sizeof(uintmax_t)) ? 0 : \ + ((uintmax_t)1 << (uintmax_t)((__n) & (NBBY * sizeof(uintmax_t) - 1)))) + +/* __BITS(m, n): bits m through n, m < n. */ +#define __BITS(__m, __n) \ + ((__BIT(MAX((__m), (__n)) + 1) - 1) ^ (__BIT(MIN((__m), (__n))) - 1)) + #endif /* _LIBNETBSD_SYS_CDEFS_H_ */ |
