lib/ipx_ntop.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <errno.h>
   3 #include <sys/types.h>
   4 #include <sys/socket.h>
   5 #include <netinet/in.h>
   6
   7 #include "utils.h"
   8
   9 static __inline__ int do_digit(char *str, u_int32_t addr, u_int32_t scale, size_t *pos, size_t len)
  10 {
  11         u_int32_t tmp = addr >> (scale * 4);
  12
  13         if (*pos == len)
  14                 return 1;
  15
  16         tmp &= 0x0f;
  17         if (tmp > 9)
  18                 *str = tmp + 'A' - 10;
  19         else
  20                 *str = tmp + '0';
  21         (*pos)++;
  22
  23         return 0;
  24 }
  25
  26 static const char *ipx_ntop1(const struct ipx_addr *addr, char *str, size_t len)
  27 {
  28         int i;
  29         size_t pos = 0;
  30
  31         if (len == 0)
  32                 return str;
  33
  34         for(i = 7; i >= 0; i--)
  35                 if (do_digit(str + pos, ntohl(addr->ipx_net), i, &pos, len))
  36                         return str;
  37
  38         if (pos == len)
  39                 return str;
  40
  41         *(str + pos) = '.';
  42         pos++;
  43
  44         for(i = 0; i < 6; i++) {
  45                 if (do_digit(str + pos, addr->ipx_node[i], 1, &pos, len))
  46                         return str;
  47                 if (do_digit(str + pos, addr->ipx_node[i], 0, &pos, len))
  48                         return str;
  49         }
  50
  51         if (pos == len)
  52                 return str;
  53
  54         *(str + pos) = 0;
  55
  56         return str;
  57 }
  58
  59
  60 const char *ipx_ntop(int af, const void *addr, char *str, size_t len)
  61 {
  62         switch(af) {
  63                 case AF_IPX:
  64                         errno = 0;
  65                         return ipx_ntop1((struct ipx_addr *)addr, str, len);
  66                 default:
  67                         errno = EAFNOSUPPORT;
  68         }
  69
  70         return NULL;
  71 }