lib/inet_ntop.c

   1 /*
   2  * inet_ntop.c
   3  *
   4  * Simple version of inet_ntop()
   5  *
   6  */
   7
   8 #include "config.h"
   9
  10 extern int errno;
  11
  12 const char *inet_ntop(int af, const void *src,
  13                       char *dst, socklen_t cnt)
  14 {
  15     char *p;
  16
  17     switch(af) {
  18     case AF_INET:
  19         p = inet_ntoa(*((struct in_addr *)src));
  20         if (p) {
  21             if (cnt <= strlen(p)) {
  22                 errno = ENOSPC;
  23                 dst = NULL;
  24             } else
  25                 strcpy(dst, p);
  26         } else
  27             dst = NULL;
  28         break;
  29 #ifdef HAVE_IPV6
  30     case AF_INET6:
  31         if (cnt < 40) {
  32             errno = ENOSPC;
  33             dst = NULL;
  34         } else {
  35             struct in6_addr *a = src;
  36             int i;
  37
  38             p = (char *)dst;
  39             /* we do not compress :0: to  :: */
  40             for (i = 0; i < 8; i++)
  41                 p += sprintf(p, "%x:", ntohs(a->s6_addr16[i]));
  42             p--;
  43             *p = 0;
  44         }
  45         break;
  46 #endif
  47     default:
  48         errno = EAFNOSUPPORT;
  49         dst = NULL;
  50     }
  51     return dst;
  52 }