Defs: types

Macros

Giving a type to padding bytes is misguiding, let’s hide it in a macro

#define pad_nam2 ((c)) _ ## c

byte_union() - union between an uint8_t ‘byte’ element and a bit field

#define byte_union ((name, fields)) \
  union {          \
    uint8_t byte;      \
    struct { fields } GPACKED(1);  \
  } GPACKED(1) name

word_union() - union between an uint16_t ‘word’ element and a bit field

#define word_union ((name, fields)) \
  union {          \
    uint16_t word;      \
    struct { fields } GPACKED(2);  \
  } GPACKED(2) name

lword_union() - union between an uint32_t ‘lword’ element and a bit field

#define lword_union ((name, fields)) \
  union {          \
    uint32_t lword;      \
    struct { fields } GPACKED(4);  \
  } GPACKED(4) name

#define pad_name ((c)) pad_nam2(c)
#define pad ((bytes)) uint8_t pad_name(__COUNTER__)[bytes]

Fixed-width types for bit fields are quite meaningless

typedef unsigned int uint

typedef unsigned int uint

typedef uint8_t u8

typedef uint16_t u16

typedef uint32_t u32

typedef uint64_t u64

typedef int8_t i8

typedef int16_t i16

typedef int32_t i32

typedef int64_t i64