bits.h

   1 #ifndef _BITS_H
   2 #define _BITS_H
   3
   4 inline int test_bit(u8* buf, u64 offset)
   5 {
   6         return buf[offset >> 3] & (1<<(offset & 7));
   7 }
   8
   9 inline void init_bit(u8* buf, u64 offset, int value)
  10 {
  11         int mask = ((value & 1) << (offset & 7));
  12         buf[offset >> 3] &= ~mask;
  13         buf[offset >> 3] |= mask;
  14 }
  15
  16 inline void clear_bit(u8* buf, u64 offset)
  17 {
  18         buf[offset >> 3] &= ~(1 << (offset & 7));
  19 }
  20
  21 inline void set_bit(u8* buf, u64 offset)
  22 {
  23         buf[offset >> 3] |= 1 << (offset & 7);
  24 }
  25
  26 #endif