vsprintf: Update %pI6c to not compress a single 0
RFC 5952 (http://tools.ietf.org/html/rfc5952) mandates that 2 or more
consecutive 0's are required before using :: compression.
Update ip6_compressed_string to match the RFC and update the http
reference as well.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index c112056..4365df3 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -666,6 +666,8 @@
colonpos = i;
}
}
+ if (longest == 1) /* don't compress a single 0 */
+ colonpos = -1;
/* emit address */
for (i = 0; i < range; i++) {
@@ -826,7 +828,7 @@
* IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
* - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
* - 'I6c' for IPv6 addresses printed as specified by
- * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
+ * http://tools.ietf.org/html/rfc5952
* - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
* "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
* Options for %pU are:
