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| #include <errno.h>
| #include <string.h>
| #include <sys/types.h>
| #include <netinet/in.h>
|
| #include "utils.h"
|
| static __inline__ u_int16_t dn_ntohs(u_int16_t addr)
| {
| union {
| u_int8_t byte[2];
| u_int16_t word;
| } u;
|
| u.word = addr;
| return ((u_int16_t)u.byte[0]) | (((u_int16_t)u.byte[1]) << 8);
| }
|
| static __inline__ int do_digit(char *str, u_int16_t *addr, u_int16_t scale, size_t *pos, size_t len, int *started)
| {
| u_int16_t tmp = *addr / scale;
|
| if (*pos == len)
| return 1;
|
| if (((tmp) > 0) || *started || (scale == 1)) {
| *str = tmp + '0';
| *started = 1;
| (*pos)++;
| *addr -= (tmp * scale);
| }
|
| return 0;
| }
|
|
| static const char *dnet_ntop1(const struct dn_naddr *dna, char *str, size_t len)
| {
| u_int16_t addr, area;
| size_t pos = 0;
| int started = 0;
|
| memcpy(&addr, dna->a_addr, sizeof(addr));
| addr = dn_ntohs(addr);
| area = addr >> 10;
|
| if (dna->a_len != 2)
| return NULL;
|
| addr &= 0x03ff;
|
| if (len == 0)
| return str;
|
| if (do_digit(str + pos, &area, 10, &pos, len, &started))
| return str;
|
| if (do_digit(str + pos, &area, 1, &pos, len, &started))
| return str;
|
| if (pos == len)
| return str;
|
| *(str + pos) = '.';
| pos++;
| started = 0;
|
| if (do_digit(str + pos, &addr, 1000, &pos, len, &started))
| return str;
|
| if (do_digit(str + pos, &addr, 100, &pos, len, &started))
| return str;
|
| if (do_digit(str + pos, &addr, 10, &pos, len, &started))
| return str;
|
| if (do_digit(str + pos, &addr, 1, &pos, len, &started))
| return str;
|
| if (pos == len)
| return str;
|
| *(str + pos) = 0;
|
| return str;
| }
|
|
| const char *dnet_ntop(int af, const void *addr, char *str, size_t len)
| {
| switch(af) {
| case AF_DECnet:
| errno = 0;
| return dnet_ntop1((struct dn_naddr *)addr, str, len);
| default:
| errno = EAFNOSUPPORT;
| }
|
| return NULL;
| }
|
|
