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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>
This commit is contained in:
Harvey Harrison 2008-10-28 16:04:44 -07:00 committed by David S. Miller
parent 3a2dfbe8ac
commit 689afa7da1
1 changed files with 22 additions and 0 deletions
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22
lib/vsprintf.c
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@ -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) {