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| author | Denis Vlasenko | 2008-04-25 08:13:36 +0000 |
|---|---|---|
| committer | Denis Vlasenko | 2008-04-25 08:13:36 +0000 |
| commit | a6b3a1f0bfc394a18b4cb4181a4827bf054206b4 (patch) | |
| tree | a8251e40e9e9cd00a347da3236348727f2c5efa6 | |
| parent | 4d89a8bd1d6a081be559656b67f4adfc75137740 (diff) | |
| download | busybox-a6b3a1f0bfc394a18b4cb4181a4827bf054206b4.zip busybox-a6b3a1f0bfc394a18b4cb4181a4827bf054206b4.tar.gz | |
arping: save a few bytes by using mempcpy
function old new delta
catcher 357 339 -18
| -rw-r--r-- | networking/arping.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/networking/arping.c b/networking/arping.c index 2b7a43c..9d2c671 100644 --- a/networking/arping.c +++ b/networking/arping.c @@ -66,6 +66,13 @@ struct globals { count = -1; \ } while (0) +// If GNUisms are not available... +//static void *mempcpy(void *_dst, const void *_src, int n) +//{ +// memcpy(_dst, _src, n); +// return (char*)_dst + n; +//} + static int send_pack(struct in_addr *src_addr, struct in_addr *dst_addr, struct sockaddr_ll *ME, struct sockaddr_ll *HE) @@ -81,20 +88,15 @@ static int send_pack(struct in_addr *src_addr, ah->ar_pln = 4; ah->ar_op = option_mask32 & ADVERT ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST); - memcpy(p, &ME->sll_addr, ah->ar_hln); - p += ME->sll_halen; - - memcpy(p, src_addr, 4); - p += 4; + p = mempcpy(p, &ME->sll_addr, ah->ar_hln); + p = mempcpy(p, src_addr, 4); if (option_mask32 & ADVERT) - memcpy(p, &ME->sll_addr, ah->ar_hln); + p = mempcpy(p, &ME->sll_addr, ah->ar_hln); else - memcpy(p, &HE->sll_addr, ah->ar_hln); - p += ah->ar_hln; + p = mempcpy(p, &HE->sll_addr, ah->ar_hln); - memcpy(p, dst_addr, 4); - p += 4; + p = mempcpy(p, dst_addr, 4); err = sendto(sock_fd, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE)); if (err == p - buf) { |