do/eof


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bool
do_eof(stab)
STAB *stab;
{
    register STIO *stio;
    int ch;

    if (!stab) {			/* eof() */
	if (argvstab)
	    stio = stab_io(argvstab);
	else
	    return TRUE;
    }
    else
	stio = stab_io(stab);

    if (!stio)
	return TRUE;

    while (stio->ifp) {

#ifdef STDSTDIO			/* (the code works without this) */
	if (stio->ifp->_cnt > 0)	/* cheat a little, since */
	    return FALSE;		/* this is the most usual case */
#endif

	ch = getc(stio->ifp);
	if (ch != EOF) {
	    (void)ungetc(ch, stio->ifp);
	    return FALSE;
	}
#ifdef STDSTDIO
	if (stio->ifp->_cnt < -1)
	    stio->ifp->_cnt = -1;
#endif
	if (!stab) {			/* not necessarily a real EOF yet? */
	    if (!nextargv(argvstab))	/* get another fp handy */
		return TRUE;
	}
	else
	    return TRUE;		/* normal fp, definitely end of file */
    }
    return TRUE;
}