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vsprintf: add %pMR for Bluetooth MAC address

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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>
This commit is contained in:
Andrei Emeltchenko 2012-07-30 14:40:23 -07:00 • committed by Linus Torvalds
parent 61e99ab8e3
commit 76597ff989
2 changed files with 24 additions and 4 deletions
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23
lib/vsprintf.c
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@ -662,15 +662,28 @@ char *mac_address_string(char *buf, char *end, u8 *addr,
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 @@ int kptr_restrict __read_mostly;
* - '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 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
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