Messages in this thread Patch in this message | | | Subject | [RFC PATCH 1/5] printk: add %p6 format specifier for IPv6 addresses | From | Harvey Harrison <> | Date | Mon, 27 Oct 2008 21:05:17 -0700 |
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Takes a pointer to a IPv6 address and formats it in the usual colon-separated hex format: xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
Each 16 bit word is printed in network-endian byteorder.
%#p6 is also supported and will omit the colons.
%p6 is a replacement for NIP6_FMT and NIP6() %#p6 is a replacement for NIP6_SEQFMT and NIP6()
Note that NIP6() took a struct in6_addr whereas this takes a pointer to a struct in6_addr.
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> --- Dave, I haven't seen the %pM ones hit your tree yet, but this should be pretty trivial to put on top.
Regardless, I found what looks like a pretty blatent bug that is separated in patch 2/5. Consider this a beta as I haven't done more than trivial tests thus far. But it would be good to get another set of eyes.
lib/vsprintf.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 2025305..034e605 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -598,6 +598,24 @@ static char *mac_address(char *buf, char *end, u8 *addr, int field_width, return string(buf, end, mac_addr, field_width, precision, flags & ~SPECIAL); } +static char *ip6_addr_string(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); +} + /* * Show a '%p' thing. A kernel extension is that the '%p' is followed * by an extra set of alphanumeric characters that are extended format @@ -611,6 +629,8 @@ static char *mac_address(char *buf, char *end, u8 *addr, int field_width, * 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 + * - '6' For a IPv6 address prints the address in network-ordered 16 bit hex + * with colon separators * * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 * function pointers are really function descriptors, which contain a @@ -628,6 +648,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field return resource_string(buf, end, ptr, field_width, precision, flags); case 'M': return mac_address(buf, end, ptr, field_width, precision, flags); + case '6': + return ip6_addr_string(buf, end, ptr, field_width, precision, flags); } flags |= SMALL; if (field_width == -1) { -- 1.6.0.3.729.g6ea410
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