/*
* 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);
}
/*
* 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);
}
