osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 1 | #include <errno.h> |
Mike Frysinger | 9ec0e89 | 2010-06-09 14:52:41 +0000 | [diff] [blame] | 2 | #include <string.h> |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 3 | #include <sys/types.h> |
| 4 | #include <netinet/in.h> |
| 5 | |
| 6 | #include "utils.h" |
| 7 | |
| 8 | static __inline__ u_int16_t dn_ntohs(u_int16_t addr) |
| 9 | { |
| 10 | union { |
| 11 | u_int8_t byte[2]; |
| 12 | u_int16_t word; |
| 13 | } u; |
| 14 | |
| 15 | u.word = addr; |
| 16 | return ((u_int16_t)u.byte[0]) | (((u_int16_t)u.byte[1]) << 8); |
| 17 | } |
| 18 | |
| 19 | static __inline__ int do_digit(char *str, u_int16_t *addr, u_int16_t scale, size_t *pos, size_t len, int *started) |
| 20 | { |
| 21 | u_int16_t tmp = *addr / scale; |
| 22 | |
| 23 | if (*pos == len) |
| 24 | return 1; |
| 25 | |
| 26 | if (((tmp) > 0) || *started || (scale == 1)) { |
| 27 | *str = tmp + '0'; |
| 28 | *started = 1; |
| 29 | (*pos)++; |
| 30 | *addr -= (tmp * scale); |
| 31 | } |
| 32 | |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | |
| 37 | static const char *dnet_ntop1(const struct dn_naddr *dna, char *str, size_t len) |
| 38 | { |
Mike Frysinger | 9ec0e89 | 2010-06-09 14:52:41 +0000 | [diff] [blame] | 39 | u_int16_t addr, area; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 40 | size_t pos = 0; |
| 41 | int started = 0; |
| 42 | |
Mike Frysinger | 9ec0e89 | 2010-06-09 14:52:41 +0000 | [diff] [blame] | 43 | memcpy(&addr, dna->a_addr, sizeof(addr)); |
| 44 | addr = dn_ntohs(addr); |
| 45 | area = addr >> 10; |
| 46 | |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 47 | if (dna->a_len != 2) |
| 48 | return NULL; |
| 49 | |
| 50 | addr &= 0x03ff; |
| 51 | |
| 52 | if (len == 0) |
| 53 | return str; |
| 54 | |
| 55 | if (do_digit(str + pos, &area, 10, &pos, len, &started)) |
| 56 | return str; |
| 57 | |
| 58 | if (do_digit(str + pos, &area, 1, &pos, len, &started)) |
| 59 | return str; |
| 60 | |
| 61 | if (pos == len) |
| 62 | return str; |
| 63 | |
| 64 | *(str + pos) = '.'; |
| 65 | pos++; |
| 66 | started = 0; |
| 67 | |
| 68 | if (do_digit(str + pos, &addr, 1000, &pos, len, &started)) |
| 69 | return str; |
| 70 | |
| 71 | if (do_digit(str + pos, &addr, 100, &pos, len, &started)) |
| 72 | return str; |
| 73 | |
| 74 | if (do_digit(str + pos, &addr, 10, &pos, len, &started)) |
| 75 | return str; |
| 76 | |
| 77 | if (do_digit(str + pos, &addr, 1, &pos, len, &started)) |
| 78 | return str; |
| 79 | |
| 80 | if (pos == len) |
| 81 | return str; |
| 82 | |
| 83 | *(str + pos) = 0; |
| 84 | |
| 85 | return str; |
| 86 | } |
| 87 | |
| 88 | |
| 89 | const char *dnet_ntop(int af, const void *addr, char *str, size_t len) |
| 90 | { |
| 91 | switch(af) { |
| 92 | case AF_DECnet: |
| 93 | errno = 0; |
| 94 | return dnet_ntop1((struct dn_naddr *)addr, str, len); |
| 95 | default: |
| 96 | errno = EAFNOSUPPORT; |
| 97 | } |
| 98 | |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | |