Message ID | 1305703250-23111-1-git-send-email-ordex@autistici.org (mailing list archive) |
---|---|

State | Accepted, archived |

Commit | 7962ae7cc6e3e5709dcc9189952ba3a81a931eea |

Headers |

## Commit Message

## Comments

diff --git a/main.h b/main.h index 3ca3941..90db244 100644 --- a/main.h +++ b/main.h @@ -181,4 +181,20 @@ static inline int compare_eth(void *data1, void *data2) #define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) +/* Returns the smallest signed integer in two's complement with the sizeof x */ +#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u))) + +/* Checks if a sequence number x is a predecessor/successor of y. + * they handle overflows/underflows and can correctly check for a + * predecessor/successor unless the variable sequence number has grown by + * more then 2**(bitwidth(x)-1)-1. + * This means that for a uint8_t with the maximum value 255, it would think: + * - when adding nothing - it is neither a predecessor nor a successor + * - before adding more than 127 to the starting value - it is a predecessor, + * - when adding 128 - it is neither a predecessor nor a successor, + * - after adding more than 127 to the starting value - it is a successor */ +#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \ + _dummy > smallest_signed_int(_dummy); }) +#define seq_after(x, y) seq_before(y, x) + #endif /* _NET_BATMAN_ADV_MAIN_H_ */ diff --git a/vis.c b/vis.c index c39f20c..e1ed552 100644 --- a/vis.c +++ b/vis.c @@ -30,22 +30,6 @@ #define MAX_VIS_PACKET_SIZE 1000 -/* Returns the smallest signed integer in two's complement with the sizeof x */ -#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u))) - -/* Checks if a sequence number x is a predecessor/successor of y. - * they handle overflows/underflows and can correctly check for a - * predecessor/successor unless the variable sequence number has grown by - * more then 2**(bitwidth(x)-1)-1. - * This means that for a uint8_t with the maximum value 255, it would think: - * - when adding nothing - it is neither a predecessor nor a successor - * - before adding more than 127 to the starting value - it is a predecessor, - * - when adding 128 - it is neither a predecessor nor a successor, - * - after adding more than 127 to the starting value - it is a successor */ -#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \ - _dummy > smallest_signed_int(_dummy); }) -#define seq_after(x, y) seq_before(y, x) - static void start_vis_timer(struct bat_priv *bat_priv); /* free the info */