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ping: code shrink

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function                                             old     new   delta
unpack_tail                                          262     243     -19

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2013-06-28 01:33:47 +02:00
parent 59f46676a9
commit 26a7e2ecbf
1 changed files with 14 additions and 13 deletions
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27
networking/ping.c
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@ -372,7 +372,7 @@ struct globals {
struct sockaddr_in6 sin6;
#endif
} pingaddr;
char rcvd_tbl[MAX_DUP_CHK / 8];
unsigned char rcvd_tbl[MAX_DUP_CHK / 8];
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define if_index (G.if_index )
@ -402,13 +402,11 @@ void BUG_ping_globals_too_big(void);
} while (0)
#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
#define SET(bit) (A(bit) |= B(bit))
#define CLR(bit) (A(bit) &= (~B(bit)))
#define TST(bit) (A(bit) & B(bit))
/**************************************************************************/
#define BYTE(bit) rcvd_tbl[(bit)>>3]
#define MASK(bit) (1 << ((bit) & 7))
#define SET(bit) (BYTE(bit) |= MASK(bit))
#define CLR(bit) (BYTE(bit) &= (~MASK(bit)))
#define TST(bit) (BYTE(bit) & MASK(bit))
static void print_stats_and_exit(int junk) NORETURN;
static void print_stats_and_exit(int junk UNUSED_PARAM)
@ -578,11 +576,10 @@ static void unpack_tail(int sz, uint32_t *tp,
const char *from_str,
uint16_t recv_seq, int ttl)
{
unsigned char *b, m;
const char *dupmsg = " (DUP!)";
unsigned triptime = triptime; /* for gcc */
++G.nreceived;
if (tp) {
/* (int32_t) cast is for hypothetical 64-bit unsigned */
/* (doesn't hurt 32-bit real-world anyway) */
@ -594,11 +591,15 @@ static void unpack_tail(int sz, uint32_t *tp,
tmax = triptime;
}
if (TST(recv_seq % MAX_DUP_CHK)) {
b = &BYTE(recv_seq % MAX_DUP_CHK);
m = MASK(recv_seq % MAX_DUP_CHK);
/*if TST(recv_seq % MAX_DUP_CHK):*/
if (*b & m) {
++G.nrepeats;
--G.nreceived;
} else {
SET(recv_seq % MAX_DUP_CHK);
/*SET(recv_seq % MAX_DUP_CHK):*/
*b |= m;
++G.nreceived;
dupmsg += 7;
}