Messages in this thread Patch in this message | | | Subject | [RFC PATCHv2] printk: add the %pM, %p4, %p6 format specifiers | From | Harvey Harrison <> | Date | Sun, 26 Oct 2008 17:31:05 -0700 |
| |
Add format specifiers for printing out colon-separated bytes:
MAC addresses (%pM): xx:xx:xx:xx:xx:xx
IPv4 addresses (%p4): xx:xx:xx:xx
IPv6 addresses (%p6): xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
%#pM, %#p4, %#p6 are also supported and print without the colon separators.
[Based on Johannes Berg's initial patch] Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> --- This one without the embarrassing index typos in ip6_address and mac_address.
lib/vsprintf.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 64 insertions(+), 0 deletions(-)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index a013bbc..eec3879 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -581,6 +581,58 @@ static char *resource_string(char *buf, char *end, struct resource *res, int fie return string(buf, end, sym, field_width, precision, flags); } +static char *ip4_address(char *buf, char *end, u8 *addr, int field_width, + int precision, int flags) +{ + char ip4_addr[4 * 3]; /* (4 * 2 hex digits), 3 colons and trailing zero */ + char *p = ip4_addr; + int i; + + for (i = 0; i < 4; i++) { + p = pack_hex_byte(p, addr[i]); + if (!(flags & SPECIAL) && i != 3) + *p++ = ':'; + } + *p = '\0'; + + return string(buf, end, ip4_addr, field_width, precision, flags & ~SPECIAL); +} + +static char *ip6_address(char *buf, char *end, u8 *addr, int field_width, + int precision, int flags) +{ + char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */ + char *p = ip6_addr; + int i; + + for (i = 0; i < 8; i++) { + p = pack_hex_byte(p, addr[2 * i]); + p = pack_hex_byte(p, addr[2 * i + 1]); + if (!(flags & SPECIAL) && i != 7) + *p++ = ':'; + } + *p = '\0'; + + return string(buf, end, ip6_addr, field_width, precision, flags & ~SPECIAL); +} + +static char *mac_address(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 +644,12 @@ 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 + * - '4' For a 4-byte IPv4 address, it prints the address in the + * usual colon-separated hex notation + * - 'M' For a 16-byte IPv6 address, it prints the address in colon separated + * big-endian 16 bit 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 +665,12 @@ 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(buf, end, ptr, field_width, precision, flags); + case '4': + return ip4_address(buf, end, ptr, field_width, precision, flags); + case '6': + return ip6_address(buf, end, ptr, field_width, precision, flags); } flags |= SMALL; if (field_width == -1) { -- 1.6.0.3.729.g6ea410
| |