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Added helper macros to define portable bitfields with gcc

This commit is contained in:
Martin Willi 2010-08-19 11:23:07 +02:00
parent f9277ac426
commit 7ba89ccd7f
1 changed files with 22 additions and 0 deletions
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22
src/libstrongswan/utils.h
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@ -137,6 +137,28 @@
static const typeof(name) *_##name = (const typeof(name)*)name; \
static ret name(this, ##__VA_ARGS__)
/**
* Architecture independent bitfield definition helpers (at least with GCC).
*
* Defines a bitfield with a type t and a fixed size of bitfield members, e.g.:
* BITFIELD2(u_int8_t,
* low: 4,
* high: 4,
* ) flags;
* The member defined first placed at bit 0.
*/
#if BYTE_ORDER == LITTLE_ENDIAN
#define BITFIELD2(t, a, b,...) struct { t a; t b; __VA_ARGS__}
#define BITFIELD3(t, a, b, c,...) struct { t a; t b; t c; __VA_ARGS__}
#define BITFIELD4(t, a, b, c, d,...) struct { t a; t b; t c; t d; __VA_ARGS__}
#define BITFIELD5(t, a, b, c, d, e,...) struct { t a; t b; t c; t d; t e; __VA_ARGS__}
#elif BYTE_ORDER == BIG_ENDIAN
#define BITFIELD2(t, a, b,...) struct { t b; t a; __VA_ARGS__}
#define BITFIELD3(t, a, b, c,...) struct { t c; t b; t a; __VA_ARGS__}
#define BITFIELD4(t, a, b, c, d,...) struct { t d; t c; t b; t a; __VA_ARGS__}
#define BITFIELD5(t, a, b, c, d, e,...) struct { t e; t d; t c; t b; t a; __VA_ARGS__}
#endif
/**
* Macro to allocate a sized type.
*/