| 95 | */ |
| 96 | #ifdef AF_INET6 |
| 97 | static const char * |
| 98 | inet_ntop6(const unsigned char *src, char *dst, size_t size) |
| 99 | { |
| 100 | /* |
| 101 | * Note that int32_t and int16_t need only be "at least" large enough |
| 102 | * to contain a value of the specified size. On some systems, like |
| 103 | * Crays, there is no such thing as an integer variable with 16 bits. |
| 104 | * Keep this in mind if you think this function should have been coded |
| 105 | * to use pointer overlays. All the world's not a VAX. |
| 106 | */ |
| 107 | char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; |
| 108 | struct { int base, len; } best, cur; |
| 109 | unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ]; |
| 110 | int i, inc; |
| 111 | |
| 112 | /* |
| 113 | * Preprocess: |
| 114 | * Copy the input (bytewise) array into a wordwise array. |
| 115 | * Find the longest run of 0x00's in src[] for :: shorthanding. |
| 116 | */ |
| 117 | memset(words, '\0', sizeof words); |
| 118 | for (i = 0; i < NS_IN6ADDRSZ; i++) |
| 119 | words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); |
| 120 | best.base = -1; |
| 121 | cur.base = -1; |
| 122 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { |
| 123 | if (words[i] == 0) { |
| 124 | if (cur.base == -1) |
| 125 | cur.base = i, cur.len = 1; |
| 126 | else |
| 127 | cur.len++; |
| 128 | } else { |
| 129 | if (cur.base != -1) { |
| 130 | if (best.base == -1 || cur.len > best.len) |
| 131 | best = cur; |
| 132 | cur.base = -1; |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | if (cur.base != -1) { |
| 137 | if (best.base == -1 || cur.len > best.len) |
| 138 | best = cur; |
| 139 | } |
| 140 | if (best.base != -1 && best.len < 2) |
| 141 | best.base = -1; |
| 142 | |
| 143 | /* |
| 144 | * Format the result. |
| 145 | */ |
| 146 | tp = tmp; |
| 147 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { |
| 148 | /* Are we inside the best run of 0x00's? */ |
| 149 | if (best.base != -1 && i >= best.base && |
| 150 | i < (best.base + best.len)) { |
| 151 | if (i == best.base) |
| 152 | *tp++ = ':'; |
| 153 | continue; |
| 154 | } |
no test coverage detected