return;
return NULL;
shorten_hostname(host)	char host[];{	register char *p;	char *mydom;	int i;	bool canon = FALSE;	/* strip off final dot */	p = &host[strlen(host) - 1];	if (*p == '.')	{		*p = '\0';		canon = TRUE;	}	/* see if there is any domain at all -- if not, we are done */	p = strchr(host, '.');	if (p == NULL)		return;	/* yes, we have a domain -- see if it looks like us */	mydom = macvalue('m', CurEnv);	if (mydom == NULL)		mydom = "";	i = strlen(++p);	if ((canon ? strcasecmp(p, mydom) : strncasecmp(p, mydom, i)) == 0 &&	    (mydom[i] == '.' || mydom[i] == '\0'))		*--p = '\0';}