vsprintf: add %pMR for Bluetooth MAC address
Bluetooth uses mostly LE byte order which is reversed for visual
interpretation. Currently in Bluetooth in use unsafe batostr function.
This is a slightly modified version of Joe's patch (sent Sat, Dec 4,
2010).
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Cc: Joe Perches <joe@perches.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index c3f36d41..7369745 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -662,15 +662,28 @@
char *p = mac_addr;
int i;
char separator;
+ bool reversed = false;
- if (fmt[1] == 'F') { /* FDDI canonical format */
+ switch (fmt[1]) {
+ case 'F':
separator = '-';
- } else {
+ break;
+
+ case 'R':
+ reversed = true;
+ /* fall through */
+
+ default:
separator = ':';
+ break;
}
for (i = 0; i < 6; i++) {
- p = hex_byte_pack(p, addr[i]);
+ if (reversed)
+ p = hex_byte_pack(p, addr[5 - i]);
+ else
+ p = hex_byte_pack(p, addr[i]);
+
if (fmt[0] == 'M' && i != 5)
*p++ = separator;
}
@@ -933,6 +946,7 @@
* - 'm' For a 6-byte MAC address, it prints the hex address without colons
* - 'MF' For a 6-byte MAC FDDI address, it prints the address
* with a dash-separated hex notation
+ * - '[mM]R For a 6-byte MAC address, Reverse order (Bluetooth)
* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
* IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
* IPv6 uses colon separated network-order 16 bit hex with leading 0's
@@ -995,7 +1009,8 @@
return resource_string(buf, end, ptr, spec, fmt);
case 'M': /* Colon separated: 00:01:02:03:04:05 */
case 'm': /* Contiguous: 000102030405 */
- /* [mM]F (FDDI, bit reversed) */
+ /* [mM]F (FDDI) */
+ /* [mM]R (Reverse order; Bluetooth) */
return mac_address_string(buf, end, ptr, spec, fmt);
case 'I': /* Formatted IP supported
* 4: 1.2.3.4