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| author | Ondrej Zajicek <santiago@crfreenet.org> | 2015-02-24 16:19:14 +0100 |
|---|---|---|
| committer | Ondrej Zajicek <santiago@crfreenet.org> | 2015-02-24 16:19:14 +0100 |
| commit | 4e63974471c4e2f11781cda163e0dc2ac6fb72f9 (patch) | |
| tree | 494548995ca470481ecca5be900fb1cc8468655c /lib | |
| parent | 9c89560e6cdf44a21b2eff8765973ed8665fa07f (diff) | |
Add minor comment
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/birdlib.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/birdlib.h b/lib/birdlib.h index d107c399..94054769 100644 --- a/lib/birdlib.h +++ b/lib/birdlib.h @@ -33,6 +33,10 @@ #define ABS(a) ((a)>=0 ? (a) : -(a)) #define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a))) + +/* Bitfield macros */ + +/* b is u32 array (or ptr), l is size of it in bits (multiple of 32), p is 0..(l-1) */ #define BIT32_VAL(p) (((u32) 1) << ((p) % 32)) #define BIT32_TEST(b,p) ((b)[(p)/32] & BIT32_VAL(p)) #define BIT32_SET(b,p) ((b)[(p)/32] |= BIT32_VAL(p)) |