diff options
Diffstat (limited to 'include/utils.h')
| -rw-r--r-- | include/utils.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/utils.h b/include/utils.h index 88ee0c9c..cc5948c1 100644 --- a/include/utils.h +++ b/include/utils.h @@ -1,6 +1,7 @@ #ifndef NFTABLES_UTILS_H #define NFTABLES_UTILS_H +#include <asm/byteorder.h> #include <stdint.h> #include <stdbool.h> #include <stdarg.h> @@ -46,6 +47,19 @@ typeof( ((type *)0)->member ) *__mptr = (ptr); \ (type *)( (void *)__mptr - offsetof(type,member) );}) +/** + * Return a pointer to a constant variable of a size smaller than the variable. + */ +#ifdef __LITTLE_ENDIAN_BITFIELD +#define constant_data_ptr(val, len) \ + ((void *)&(val)) +#elif defined(__BIG_ENDIAN_BITFIELD) +#define constant_data_ptr(val, len) \ + ((void *)&(val) + sizeof(val) - (len) / BITS_PER_BYTE) +#else +#error "byteorder undefined" +#endif + #define field_sizeof(t, f) (sizeof(((t *)NULL)->f)) #define array_size(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) #define div_round_up(n, d) (((n) + (d) - 1) / (d)) |