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author | Harvey Harrison <harvey.harrison@gmail.com> | 2008-10-28 01:47:12 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2008-10-28 03:06:15 +0300 |
commit | dd45c9cf687682c9ce256ab14bd8914db77410bb (patch) | |
tree | 0769c1655b55f2528e9aaf8f96ba8d856f72f0ca | |
parent | 1080d709fb9d8cd4392f93476ee46a9d6ea05a5b (diff) | |
download | linux-dd45c9cf687682c9ce256ab14bd8914db77410bb.tar.xz |
printk: add %pM format specifier for MAC addresses
Add format specifiers for printing out six colon-separated bytes:
MAC addresses (%pM):
xx:xx:xx:xx:xx:xx
%#pM is also supported and omits the colon separators.
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | lib/vsprintf.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index a013bbc23717..0deaaaf2b14e 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -581,6 +581,23 @@ static char *resource_string(char *buf, char *end, struct resource *res, int fie return string(buf, end, sym, field_width, precision, flags); } +static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width, + int precision, int flags) +{ + char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */ + char *p = mac_addr; + int i; + + for (i = 0; i < 6; i++) { + p = pack_hex_byte(p, addr[i]); + if (!(flags & SPECIAL) && i != 5) + *p++ = ':'; + } + *p = '\0'; + + return string(buf, end, mac_addr, field_width, precision, flags & ~SPECIAL); +} + /* * Show a '%p' thing. A kernel extension is that the '%p' is followed * by an extra set of alphanumeric characters that are extended format @@ -592,6 +609,8 @@ static char *resource_string(char *buf, char *end, struct resource *res, int fie * - 'S' For symbolic direct pointers * - 'R' For a struct resource pointer, it prints the range of * addresses (not the name nor the flags) + * - 'M' For a 6-byte MAC address, it prints the address in the + * usual colon-separated hex notation * * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 * function pointers are really function descriptors, which contain a @@ -607,6 +626,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field return symbol_string(buf, end, ptr, field_width, precision, flags); case 'R': return resource_string(buf, end, ptr, field_width, precision, flags); + case 'M': + return mac_address_string(buf, end, ptr, field_width, precision, flags); } flags |= SMALL; if (field_width == -1) { |