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authorUlrich Drepper <drepper@redhat.com>2005-09-26 21:10:16 +0000
committerUlrich Drepper <drepper@redhat.com>2005-09-26 21:10:16 +0000
commitc6bad06ac443077ba123165fa28f876b1b91a906 (patch)
tree460ca337a1fd5889e53b7ea2b5d0e5b50a1690cf /sysdeps/posix
parent43b0572f8ab3593241d1641d235f3fcf5c7a8a83 (diff)
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(fls): New function. (gaih_inet): Don't use ffs, use fls. Convert address to native byte order first.
Diffstat (limited to 'sysdeps/posix')
-rw-r--r--sysdeps/posix/getaddrinfo.c27
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]));
}
}