libblkid-tiny/bitops.h

   1 #ifndef BITOPS_H
   2 #define BITOPS_H
   3
   4 #include <stdint.h>
   5
   6 /*
   7  * Bit map related macros. Usually provided by libc.
   8  */
   9 #include <sys/param.h>
  10
  11 #ifndef NBBY
  12 # define NBBY            CHAR_BIT
  13 #endif
  14
  15 #ifndef setbit
  16 # define setbit(a,i)    ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
  17 # define clrbit(a,i)    ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
  18 # define isset(a,i)     ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
  19 # define isclr(a,i)     (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
  20 #endif
  21
  22 /*
  23  * Byte swab macros (based on linux/byteorder/swab.h)
  24  */
  25 #define swab16(x) \
  26         ((uint16_t)( \
  27                 (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \
  28                 (((uint16_t)(x) & (uint16_t)0xff00U) >> 8) ))
  29
  30 #define swab32(x) \
  31         ((uint32_t)( \
  32                 (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
  33                 (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) | \
  34                 (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) | \
  35                 (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24) ))
  36
  37 #define swab64(x) \
  38         ((uint64_t)( \
  39                 (uint64_t)(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
  40                 (uint64_t)(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
  41                 (uint64_t)(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
  42                 (uint64_t)(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) <<  8) | \
  43                 (uint64_t)(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >>  8) | \
  44                 (uint64_t)(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
  45                 (uint64_t)(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
  46                 (uint64_t)(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56) ))
  47
  48
  49 #if __BYTE_ORDER == __BIG_ENDIAN
  50
  51 #define cpu_to_le16(x) swab16(x)
  52 #define cpu_to_le32(x) swab32(x)
  53 #define cpu_to_le64(x) swab64(x)
  54 #define cpu_to_be16(x) ((uint16_t)(x))
  55 #define cpu_to_be32(x) ((uint32_t)(x))
  56 #define cpu_to_be64(x) ((uint64_t)(x))
  57
  58 #define le16_to_cpu(x) swab16(x)
  59 #define le32_to_cpu(x) swab32(x)
  60 #define le64_to_cpu(x) swab64(x)
  61 #define be16_to_cpu(x) ((uint16_t)(x))
  62 #define be32_to_cpu(x) ((uint32_t)(x))
  63 #define be64_to_cpu(x) ((uint64_t)(x))
  64
  65 #else /* !WORDS_BIGENDIAN */
  66
  67 #define cpu_to_le16(x) ((uint16_t)(x))
  68 #define cpu_to_le32(x) ((uint32_t)(x))
  69 #define cpu_to_le64(x) ((uint64_t)(x))
  70 #define cpu_to_be16(x) swab16(x)
  71 #define cpu_to_be32(x) swab32(x)
  72 #define cpu_to_be64(x) swab64(x)
  73
  74 #define le16_to_cpu(x) ((uint16_t)(x))
  75 #define le32_to_cpu(x) ((uint32_t)(x))
  76 #define le64_to_cpu(x) ((uint64_t)(x))
  77 #define be16_to_cpu(x) swab16(x)
  78 #define be32_to_cpu(x) swab32(x)
  79 #define be64_to_cpu(x) swab64(x)
  80
  81 #endif /* WORDS_BIGENDIAN */
  82
  83 #endif /* BITOPS_H */
  84