Esempio n. 1
0
/*
 * log_init --
 *	Initialize the logging subsystem.
 *
 * PUBLIC: int log_init __P((SCR *, EXF *));
 */
int
log_init(SCR *sp, EXF *ep)
{
	DB_LOGC *logc;
	DBT data;
	size_t nlen;

	/*
	 * !!!
	 * ep MAY NOT BE THE SAME AS sp->ep, DON'T USE THE LATTER.
	 *
	 * Initialize the buffer.  The logging subsystem has its own
	 * buffers because the global ones are almost by definition
	 * going to be in use when the log runs.
	 */
	sp->wp->l_lp = NULL;
	sp->wp->l_len = 0;
	ep->l_cursor.lno = 1;		/* XXX Any valid recno. */
	ep->l_cursor.cno = 0;
	ep->l_high = ep->l_cur = 1;

	if ((sp->db_error = ep->env->log_cursor(ep->env, &logc, 0)) 
		    != 0) {
		msgq(sp, M_DBERR, "env->log_cursor");
		F_SET(ep, F_NOLOG);
		return (1);
	}
	nlen = 1024;
retry:
	BINC_GOTO(sp, sp->wp->l_lp, sp->wp->l_len, nlen);
	memset(&data, 0, sizeof(data));
	data.data = sp->wp->l_lp;
	data.ulen = sp->wp->l_len;
	data.flags = DB_DBT_USERMEM;
	switch ((sp->db_error = 
	    logc->get(logc, &ep->lsn_first, &data, DB_LAST))) {
	case ENOMEM:
		nlen = data.size;
		goto retry;
	default:
alloc_err:
		msgq(sp, M_DBERR, "logc->get");
		F_SET(ep, F_NOLOG);
		return (1);
	case 0:
		;
	}
	MEMCPY(&ep->lsn_cur, &ep->lsn_first, 1);
	MEMCPY(&ep->lsn_high, &ep->lsn_first, 1);
	logc->close(logc, 0);

	ep->l_win = NULL;
	/*LOCK_INIT(sp->wp, ep);*/

	return (0);
}
Esempio n. 2
0
/*
 * db_get --
 *	Look in the text buffers for a line, followed by the cache, followed
 *	by the database.
 *
 * PUBLIC: int db_get __P((SCR *, db_recno_t, u_int32_t, CHAR_T **, size_t *));
 */
int
db_get(SCR *sp, db_recno_t lno, u_int32_t flags, CHAR_T **pp, size_t *lenp)
		/* Line number. */ /* Pointer store. */ /* Length store. */
{
	DBT data, key;
	EXF *ep;
	TEXT *tp;
	db_recno_t l1, l2;
	const CHAR_T *wp;
	size_t wlen;
	size_t nlen;

	/*
	 * The underlying recno stuff handles zero by returning NULL, but
	 * have to have an OOB condition for the look-aside into the input
	 * buffer anyway.
	 */
	if (lno == 0)
		goto err1;

	/* Check for no underlying file. */
	if ((ep = sp->ep) == NULL) {
		ex_emsg(sp, NULL, EXM_NOFILEYET);
		goto err3;
	}

	if (LF_ISSET(DBG_NOCACHE))
		goto nocache;

	/*
	 * Look-aside into the TEXT buffers and see if the line we want
	 * is there.
	 */
	if (F_ISSET(sp, SC_TINPUT)) {
		l1 = ((TEXT *)sp->tiq.cqh_first)->lno;
		l2 = ((TEXT *)sp->tiq.cqh_last)->lno;
		if (l1 <= lno && l2 >= lno) {
#if defined(DEBUG) && 0
			vtrace(sp,
			    "retrieve TEXT buffer line %lu\n", (u_long)lno);
#endif
			for (tp = sp->tiq.cqh_first;
			    tp->lno != lno; tp = tp->q.cqe_next);
			if (lenp != NULL)
				*lenp = tp->len;
			if (pp != NULL)
				*pp = tp->lb;
			return (0);
		}
		/*
		 * Adjust the line number for the number of lines used
		 * by the text input buffers.
		 */
		if (lno > l2)
			lno -= l2 - l1;
	}

	/* Look-aside into the cache, and see if the line we want is there. */
	if (lno == sp->c_lno) {
#if defined(DEBUG) && 0
		vtrace(sp, "retrieve cached line %lu\n", (u_long)lno);
#endif
		if (lenp != NULL)
			*lenp = sp->c_len;
		if (pp != NULL)
			*pp = sp->c_lp;
		return (0);
	}
	sp->c_lno = OOBLNO;

nocache:
	nlen = 1024;
retry:
	/* data.size contains length in bytes */
	BINC_GOTO(sp, CHAR_T, sp->c_lp, sp->c_blen, nlen);

	/* Get the line from the underlying database. */
	memset(&key, 0, sizeof(key));
	key.data = &lno;
	key.size = sizeof(lno);
	memset(&data, 0, sizeof(data));
	data.data = sp->c_lp;
	data.ulen = sp->c_blen;
	data.flags = DB_DBT_USERMEM;
	switch (ep->db->get(ep->db, NULL, &key, &data, 0)) {
	case DB_BUFFER_SMALL:
		nlen = data.size;
		goto retry;
        default:
		goto err2;
	case DB_NOTFOUND:
err1:		if (LF_ISSET(DBG_FATAL))
err2:			db_err(sp, lno);
alloc_err:
err3:		if (lenp != NULL)
			*lenp = 0;
		if (pp != NULL)
			*pp = NULL;
		return (1);
	case 0:
		;
	}

	if (FILE2INT(sp, data.data, data.size, wp, wlen)) {
	    if (!F_ISSET(sp, SC_CONV_ERROR)) {
		F_SET(sp, SC_CONV_ERROR);
		msgq(sp, M_ERR, "324|Conversion error on line %d", lno);
	    }
	    goto err3;
	}

	/* Reset the cache. */
	if (wp != data.data) {
	    BINC_GOTOW(sp, sp->c_lp, sp->c_blen, wlen);
	    MEMCPYW(sp->c_lp, wp, wlen);
	}
	sp->c_lno = lno;
	sp->c_len = wlen;

#if defined(DEBUG) && 0
	vtrace(sp, "retrieve DB line %lu\n", (u_long)lno);
#endif
	if (lenp != NULL)
		*lenp = wlen;
	if (pp != NULL)
		*pp = sp->c_lp;
	return (0);
}