Gisle Vanem's code for not trusting h_aliases to always be non-NULL

  copy->h_aliases = (char**)bufptr;

  /* Figure out how many aliases there are */

  for (i = 0; orig->h_aliases[i] != NULL; ++i);

  for (i = 0; orig->h_aliases && orig->h_aliases[i]; ++i);

  /* Reserve room for the array */

  bufptr += (i + 1) * sizeof(char*);

  /* Clone all known aliases */

  if(orig->h_aliases) {

    for(i = 0; (str = orig->h_aliases[i]); i++) {

      len = strlen(str) + 1;

      strncpy(bufptr, str, len);

      copy->h_aliases[i] = bufptr;

      bufptr += len;

    }

  }

  /* if(!orig->h_aliases) i was already set to 0 */

  /* Terminate the alias list with a NULL */

  copy->h_aliases[i] = NULL;