diff options
Diffstat (limited to 'src/libstrongswan/utils.h')
| -rw-r--r-- | src/libstrongswan/utils.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/libstrongswan/utils.h b/src/libstrongswan/utils.h index 04551835e..35d3bebd1 100644 --- a/src/libstrongswan/utils.h +++ b/src/libstrongswan/utils.h @@ -138,6 +138,28 @@ 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. */ #define malloc_thing(thing) ((thing*)malloc(sizeof(thing))) |