diff options
| -rw-r--r-- | lib/vsprintf.c | 199 |
1 files changed, 152 insertions, 47 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 756ccafa9ce..cb8a112030b 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -25,6 +25,7 @@ #include <linux/kallsyms.h> #include <linux/uaccess.h> #include <linux/ioport.h> +#include <net/addrconf.h> #include <asm/page.h> /* for PAGE_SIZE */ #include <asm/div64.h> @@ -630,60 +631,156 @@ static char *resource_string(char *buf, char *end, struct resource *res, } static char *mac_address_string(char *buf, char *end, u8 *addr, - struct printf_spec spec) + struct printf_spec spec, const char *fmt) { - char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */ + char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; char *p = mac_addr; int i; for (i = 0; i < 6; i++) { p = pack_hex_byte(p, addr[i]); - if (!(spec.flags & SPECIAL) && i != 5) + if (fmt[0] == 'M' && i != 5) *p++ = ':'; } *p = '\0'; - spec.flags &= ~SPECIAL; return string(buf, end, mac_addr, spec); } -static char *ip6_addr_string(char *buf, char *end, u8 *addr, - struct printf_spec spec) +static char *ip4_string(char *p, const u8 *addr, bool leading_zeros) +{ + int i; + + for (i = 0; i < 4; i++) { + char temp[3]; /* hold each IP quad in reverse order */ + int digits = put_dec_trunc(temp, addr[i]) - temp; + if (leading_zeros) { + if (digits < 3) + *p++ = '0'; + if (digits < 2) + *p++ = '0'; + } + /* reverse the digits in the quad */ + while (digits--) + *p++ = temp[digits]; + if (i < 3) + *p++ = '.'; + } + + *p = '\0'; + return p; +} + +static char *ip6_compressed_string(char *p, const struct in6_addr *addr) { - char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */ - char *p = ip6_addr; int i; + int j; + int range; + unsigned char zerolength[8]; + int longest = 1; + int colonpos = -1; + u16 word; + u8 hi; + u8 lo; + bool needcolon = false; + bool useIPv4 = ipv6_addr_v4mapped(addr) || ipv6_addr_is_isatap(addr); + + memset(zerolength, 0, sizeof(zerolength)); + + if (useIPv4) + range = 6; + else + range = 8; + + /* find position of longest 0 run */ + for (i = 0; i < range; i++) { + for (j = i; j < range; j++) { + if (addr->s6_addr16[j] != 0) + break; + zerolength[i]++; + } + } + for (i = 0; i < range; i++) { + if (zerolength[i] > longest) { + longest = zerolength[i]; + colonpos = i; + } + } + + /* emit address */ + for (i = 0; i < range; i++) { + if (i == colonpos) { + if (needcolon || i == 0) + *p++ = ':'; + *p++ = ':'; + needcolon = false; + i += longest - 1; + continue; + } + if (needcolon) { + *p++ = ':'; + needcolon = false; + } + /* hex u16 without leading 0s */ + word = ntohs(addr->s6_addr16[i]); + hi = word >> 8; + lo = word & 0xff; + if (hi) { + if (hi > 0x0f) + p = pack_hex_byte(p, hi); + else + *p++ = hex_asc_lo(hi); + } + if (hi || lo > 0x0f) + p = pack_hex_byte(p, lo); + else + *p++ = hex_asc_lo(lo); + needcolon = true; + } + + if (useIPv4) { + if (needcolon) + *p++ = ':'; + p = ip4_string(p, &addr->s6_addr[12], false); + } + *p = '\0'; + return p; +} + +static char *ip6_string(char *p, const struct in6_addr *addr, const char *fmt) +{ + 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 (!(spec.flags & SPECIAL) && i != 7) + p = pack_hex_byte(p, addr->s6_addr[2 * i]); + p = pack_hex_byte(p, addr->s6_addr[2 * i + 1]); + if (fmt[0] == 'I' && i != 7) *p++ = ':'; } + *p = '\0'; - spec.flags &= ~SPECIAL; + return p; +} + +static char *ip6_addr_string(char *buf, char *end, const u8 *addr, + struct printf_spec spec, const char *fmt) +{ + char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; + + if (fmt[0] == 'I' && fmt[2] == 'c') + ip6_compressed_string(ip6_addr, (const struct in6_addr *)addr); + else + ip6_string(ip6_addr, (const struct in6_addr *)addr, fmt); return string(buf, end, ip6_addr, spec); } -static char *ip4_addr_string(char *buf, char *end, u8 *addr, - struct printf_spec spec) +static char *ip4_addr_string(char *buf, char *end, const u8 *addr, + struct printf_spec spec, const char *fmt) { - char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */ - char temp[3]; /* hold each IP quad in reverse order */ - char *p = ip4_addr; - int i, digits; + char ip4_addr[sizeof("255.255.255.255")]; - for (i = 0; i < 4; i++) { - digits = put_dec_trunc(temp, addr[i]) - temp; - /* reverse the digits in the quad */ - while (digits--) - *p++ = temp[digits]; - if (i != 3) - *p++ = '.'; - } - *p = '\0'; - spec.flags &= ~SPECIAL; + ip4_string(ip4_addr, addr, fmt[0] == 'i'); return string(buf, end, ip4_addr, spec); } @@ -702,11 +799,15 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, * 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 - * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated - * decimal for v4 and colon separated network-order 16 bit hex for v6) - * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is - * currently the same - * + * - 'm' For a 6-byte MAC address, it prints the hex address without colons + * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way + * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) + * IPv6 uses colon separated network-order 16 bit hex with leading 0's + * - 'i' [46] for 'raw' IPv4/IPv6 addresses + * IPv6 omits the colons (01020304...0f) + * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) + * - 'I6c' for IPv6 addresses printed as specified by + * http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 * function pointers are really function descriptors, which contain a * pointer to the real address. @@ -726,20 +827,24 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, return symbol_string(buf, end, ptr, spec, *fmt); case 'R': return resource_string(buf, end, ptr, spec); - case 'm': - spec.flags |= SPECIAL; - /* Fallthrough */ - case 'M': - return mac_address_string(buf, end, ptr, spec); - case 'i': - spec.flags |= SPECIAL; - /* Fallthrough */ - case 'I': - if (fmt[1] == '6') - return ip6_addr_string(buf, end, ptr, spec); - if (fmt[1] == '4') - return ip4_addr_string(buf, end, ptr, spec); - spec.flags &= ~SPECIAL; + case 'M': /* Colon separated: 00:01:02:03:04:05 */ + case 'm': /* Contiguous: 000102030405 */ + return mac_address_string(buf, end, ptr, spec, fmt); + case 'I': /* Formatted IP supported + * 4: 1.2.3.4 + * 6: 0001:0203:...:0708 + * 6c: 1::708 or 1::1.2.3.4 + */ + case 'i': /* Contiguous: + * 4: 001.002.003.004 + * 6: 000102...0f + */ + switch (fmt[1]) { + case '6': + return ip6_addr_string(buf, end, ptr, spec, fmt); + case '4': + return ip4_addr_string(buf, end, ptr, spec, fmt); + } break; } spec.flags |= SMALL; |