lib/ipx_ntop.c

   1 #include <errno.h>
   2 #include <sys/types.h>
   3 #include <netinet/in.h>
   4
   5 #include "utils.h"
   6
   7 static __inline__ int do_digit(char *str, u_int32_t addr, u_int32_t scale, size_t *pos, size_t len)
   8 {
   9         u_int32_t tmp = addr >> (scale * 4);
  10
  11         if (*pos == len)
  12                 return 1;
  13
  14         tmp &= 0x0f;
  15         if (tmp > 9)
  16                 *str = tmp + 'A' - 10;
  17         else
  18                 *str = tmp + '0';
  19         (*pos)++;
  20
  21         return 0;
  22 }
  23
  24 static const char *ipx_ntop1(const struct ipx_addr *addr, char *str, size_t len)
  25 {
  26         int i;
  27         size_t pos = 0;
  28
  29         if (len == 0)
  30                 return str;
  31
  32         for(i = 7; i >= 0; i--)
  33                 if (do_digit(str + pos, ntohl(addr->ipx_net), i, &pos, len))
  34                         return str;
  35
  36         if (pos == len)
  37                 return str;
  38
  39         *(str + pos) = '.';
  40         pos++;
  41
  42         for(i = 0; i < 6; i++) {
  43                 if (do_digit(str + pos, addr->ipx_node[i], 1, &pos, len))
  44                         return str;
  45                 if (do_digit(str + pos, addr->ipx_node[i], 0, &pos, len))
  46                         return str;
  47         }
  48
  49         if (pos == len)
  50                 return str;
  51
  52         *(str + pos) = 0;
  53
  54         return str;
  55 }
  56
  57
  58 const char *ipx_ntop(int af, const void *addr, char *str, size_t len)
  59 {
  60         switch(af) {
  61                 case AF_IPX:
  62                         errno = 0;
  63                         return ipx_ntop1((struct ipx_addr *)addr, str, len);
  64                 default:
  65                         errno = EAFNOSUPPORT;
  66         }
  67
  68         return NULL;
  69 }
  70
  71