diff options
| -rw-r--r-- | sysdeps/posix/getaddrinfo.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c index 4db98d9..934aae0 100644 --- a/sysdeps/posix/getaddrinfo.c +++ b/sysdeps/posix/getaddrinfo.c @@ -1304,6 +1304,19 @@ get_precedence (const struct sockaddr_storage *ss) } +/* Find last bit set in a word. */ +static int +fls (uint32_t a) +{ + uint32_t mask; + int n = 0; + for (n = 0, mask = 1 << 31; n < 32; mask >>= 1, ++n) + if ((a & mask) != 0) + break; + return n; +} + + static int rfc3484_sort (const void *p1, const void *p2) { @@ -1407,8 +1420,10 @@ rfc3484_sort (const void *p1, const void *p2) in2_dst = (struct sockaddr_in *) a2->dest_addr->ai_addr; in2_src = (struct sockaddr_in *) &a2->source_addr; - bit1 = ffs (in1_dst->sin_addr.s_addr ^ in1_src->sin_addr.s_addr); - bit2 = ffs (in2_dst->sin_addr.s_addr ^ in2_src->sin_addr.s_addr); + bit1 = fls (ntohl (in1_dst->sin_addr.s_addr + ^ in1_src->sin_addr.s_addr)); + bit2 = fls (ntohl (in2_dst->sin_addr.s_addr + ^ in2_src->sin_addr.s_addr)); } else if (a1->dest_addr->ai_family == PF_INET6) { @@ -1435,10 +1450,10 @@ rfc3484_sort (const void *p1, const void *p2) if (i < 4) { - bit1 = ffs (in1_dst->sin6_addr.s6_addr32[i] - ^ in1_src->sin6_addr.s6_addr32[i]); - bit2 = ffs (in2_dst->sin6_addr.s6_addr32[i] - ^ in2_src->sin6_addr.s6_addr32[i]); + bit1 = fls (ntohl (in1_dst->sin6_addr.s6_addr32[i] + ^ in1_src->sin6_addr.s6_addr32[i])); + bit2 = fls (ntohl (in2_dst->sin6_addr.s6_addr32[i] + ^ in2_src->sin6_addr.s6_addr32[i])); } } |