1: #include <arpa/inet.h>
    2: #include <errno.h>
    3: #include <netinet/in.h>
    4: #include <stdio.h>
    5: #include <string.h>
    6: 
    7: int
    8: main (void)
    9: {
   10:   struct in_addr addr4;
   11:   struct in6_addr addr6;
   12:   char buf[64];
   13:   int result = 0;
   14: 
   15:   addr4.s_addr = 0xe0e0e0e0;
   16:   addr6.s6_addr16[0] = 0;
   17:   addr6.s6_addr16[1] = 0;
   18:   addr6.s6_addr16[2] = 0;
   19:   addr6.s6_addr16[3] = 0;
   20:   addr6.s6_addr16[4] = 0;
   21:   addr6.s6_addr16[5] = 0xffff;
   22:   addr6.s6_addr32[3] = 0xe0e0e0e0;
   23:   memset (buf, 'x', sizeof buf);
   24: 
   25:   if (inet_ntop (AF_INET, &addr4, buf, 15) != NULL)
   26:     {
   27:       puts ("1st inet_ntop returned non-NULL");
   28:       result++;
   29:     }
   30:   else if (errno != ENOSPC)
   31:     {
   32:       puts ("1st inet_ntop didn't fail with ENOSPC");
   33:       result++;
   34:     }
   35:   if (buf[15] != 'x')
   36:     {
   37:       puts ("1st inet_ntop wrote past the end of buffer");
   38:       result++;
   39:     }
   40: 
   41:   if (inet_ntop (AF_INET, &addr4, buf, 16) != buf)
   42:     {
   43:       puts ("2nd inet_ntop did not return buf");
   44:       result++;
   45:     }
   46:   if (memcmp (buf, "224.224.224.224\0" "xxxxxxxx", 24) != 0)
   47:     {
   48:       puts ("2nd inet_ntop wrote past the end of buffer");
   49:       result++;
   50:     }
   51: 
   52:   if (inet_ntop (AF_INET6, &addr6, buf, 22) != NULL)
   53:     {
   54:       puts ("3rd inet_ntop returned non-NULL");
   55:       result++;
   56:     }
   57:   else if (errno != ENOSPC)
   58:     {
   59:       puts ("3rd inet_ntop didn't fail with ENOSPC");
   60:       result++;
   61:     }
   62:   if (buf[22] != 'x')
   63:     {
   64:       puts ("3rd inet_ntop wrote past the end of buffer");
   65:       result++;
   66:     }
   67: 
   68:   if (inet_ntop (AF_INET6, &addr6, buf, 23) != buf)
   69:     {
   70:       puts ("4th inet_ntop did not return buf");
   71:       result++;
   72:     }
   73:   if (memcmp (buf, "::ffff:224.224.224.224\0" "xxxxxxxx", 31) != 0)
   74:     {
   75:       puts ("4th inet_ntop wrote past the end of buffer");
   76:       result++;
   77:     }
   78: 
   79:   memset (&addr6.s6_addr, 0xe0, sizeof (addr6.s6_addr));
   80: 
   81:   if (inet_ntop (AF_INET6, &addr6, buf, 39) != NULL)
   82:     {
   83:       puts ("5th inet_ntop returned non-NULL");
   84:       result++;
   85:     }
   86:   else if (errno != ENOSPC)
   87:     {
   88:       puts ("5th inet_ntop didn't fail with ENOSPC");
   89:       result++;
   90:     }
   91:   if (buf[39] != 'x')
   92:     {
   93:       puts ("5th inet_ntop wrote past the end of buffer");
   94:       result++;
   95:     }
   96: 
   97:   if (inet_ntop (AF_INET6, &addr6, buf, 40) != buf)
   98:     {
   99:       puts ("6th inet_ntop did not return buf");
  100:       result++;
  101:     }
  102:   if (memcmp (buf, "e0e0:e0e0:e0e0:e0e0:e0e0:e0e0:e0e0:e0e0\0"
  103:                    "xxxxxxxx", 48) != 0)
  104:     {
  105:       puts ("6th inet_ntop wrote past the end of buffer");
  106:       result++;
  107:     }
  108: 
  109:   
  110:   return result;
  111: }