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| author |   Harvey Harrison <harvey.harrison@gmail.com> | 2008-10-28 16:04:44 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2008-10-28 16:04:44 -0700 |
| commit | 689afa7da106032a3e859ae35494f80dd6eac640 (patch) | |
| tree | 470f00c94ff2f179c6b0405c4726b92a51e7110a /lib/vsprintf.c | |
| parent | xfrm: Notify changes in UDP encapsulation via netlink (diff) | |
| download | linux-dev-689afa7da106032a3e859ae35494f80dd6eac640.tar.xz linux-dev-689afa7da106032a3e859ae35494f80dd6eac640.zip | |
printk: add %p6 format specifier for IPv6 addresses
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/vsprintf.c')
| -rw-r--r-- | lib/vsprintf.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 0deaaaf2b14e..cb5bc04ff82b 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -598,6 +598,24 @@ static char *mac_address_string(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_string(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_string(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) { |