NetBSD-5.0.2/dist/nvi/common/db.c
/* $NetBSD: db.c,v 1.1.1.2.6.2 2009/01/20 02:50:02 snj Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "Id: db.c,v 10.48 2002/06/08 19:32:52 skimo Exp (Berkeley) Date: 2002/06/08 19:32:52";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "common.h"
#include "../vi/vi.h"
static int append __P((SCR*, db_recno_t, const CHAR_T*, size_t, lnop_t, int));
/*
* db_eget --
* Front-end to db_get, special case handling for empty files.
*
* PUBLIC: int db_eget __P((SCR *, db_recno_t, CHAR_T **, size_t *, int *));
*/
int
db_eget(SCR *sp, db_recno_t lno, CHAR_T **pp, size_t *lenp, int *isemptyp)
/* Line number. */
/* Pointer store. */
/* Length store. */
{
db_recno_t l1;
if (isemptyp != NULL)
*isemptyp = 0;
/* If the line exists, simply return it. */
if (!db_get(sp, lno, 0, pp, lenp))
return (0);
/*
* If the user asked for line 0 or line 1, i.e. the only possible
* line in an empty file, find the last line of the file; db_last
* fails loudly.
*/
if ((lno == 0 || lno == 1) && db_last(sp, &l1))
return (1);
/* If the file isn't empty, fail loudly. */
if ((lno != 0 && lno != 1) || l1 != 0) {
db_err(sp, lno);
return (1);
}
if (isemptyp != NULL)
*isemptyp = 1;
return (1);
}
/*
* 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);
}
/*
* db_delete --
* Delete a line from the file.
*
* PUBLIC: int db_delete __P((SCR *, db_recno_t));
*/
int
db_delete(SCR *sp, db_recno_t lno)
{
DBT key;
EXF *ep;
#if defined(DEBUG) && 0
vtrace(sp, "delete line %lu\n", (u_long)lno);
#endif
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
if (ep->l_win && ep->l_win != sp->wp) {
ex_emsg(sp, NULL, EXM_LOCKED);
return 1;
}
/* Update marks, @ and global commands. */
if (line_insdel(sp, LINE_DELETE, lno))
return 1;
/* Log before change. */
log_line(sp, lno, LOG_LINE_DELETE_B);
/* Update file. */
memset(&key, 0, sizeof(key));
key.data = &lno;
key.size = sizeof(lno);
if ((sp->db_error = ep->db->del(ep->db, NULL, &key, 0)) != 0) {
msgq(sp, M_DBERR, "003|unable to delete line %lu",
(u_long)lno);
return (1);
}
/* Flush the cache, update line count, before screen update. */
update_cache(sp, LINE_DELETE, lno);
/* File now modified. */
if (F_ISSET(ep, F_FIRSTMODIFY))
(void)rcv_init(sp);
F_SET(ep, F_MODIFIED);
/* Log after change. */
log_line(sp, lno, LOG_LINE_DELETE_F);
/* Update screen. */
return (scr_update(sp, lno, LINE_DELETE, 1));
}
/* maybe this could be simpler
*
* DB3 behaves differently from DB1
*
* if lno != 0 just go to lno and put the new line after it
* if lno == 0 then if there are any record, put in front of the first
* otherwise just append to the end thus creating the first
* line
*/
static int
append(SCR *sp, db_recno_t lno, const CHAR_T *p, size_t len, lnop_t op, int update)
{
DBT data, key;
DBC *dbcp_put;
EXF *ep;
const char *fp;
size_t flen;
int rval;
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
if (ep->l_win && ep->l_win != sp->wp) {
ex_emsg(sp, NULL, EXM_LOCKED);
return 1;
}
/* Log before change. */
log_line(sp, lno + 1, LOG_LINE_APPEND_B);
/* Update file. */
memset(&key, 0, sizeof(key));
key.data = &lno;
key.size = sizeof(lno);
memset(&data, 0, sizeof(data));
if ((sp->db_error = ep->db->cursor(ep->db, NULL, &dbcp_put, 0)) != 0)
return 1;
INT2FILE(sp, p, len, fp, flen);
if (lno != 0) {
if ((sp->db_error = dbcp_put->c_get(dbcp_put, &key, &data, DB_SET)) != 0)
goto err2;
data.data = __UNCONST(fp);
data.size = flen;
if ((sp->db_error = dbcp_put->c_put(dbcp_put, &key, &data, DB_AFTER)) != 0) {
err2:
(void)dbcp_put->c_close(dbcp_put);
msgq(sp, M_DBERR,
(op == LINE_APPEND)
? "004|unable to append to line %lu"
: "005|unable to insert at line %lu",
(u_long)lno);
return (1);
}
} else {
if ((sp->db_error = dbcp_put->c_get(dbcp_put, &key, &data, DB_FIRST)) != 0) {
if (sp->db_error != DB_NOTFOUND)
goto err2;
data.data = __UNCONST(fp);
data.size = flen;
if ((sp->db_error = ep->db->put(ep->db, NULL, &key, &data, DB_APPEND)) != 0) {
goto err2;
}
} else {
key.data = &lno;
key.size = sizeof(lno);
data.data = __UNCONST(fp);
data.size = flen;
if ((sp->db_error = dbcp_put->c_put(dbcp_put, &key, &data, DB_BEFORE)) != 0) {
goto err2;
}
}
}
(void)dbcp_put->c_close(dbcp_put);
/* Flush the cache, update line count, before screen update. */
update_cache(sp, LINE_INSERT, lno);
/* File now dirty. */
if (F_ISSET(ep, F_FIRSTMODIFY))
(void)rcv_init(sp);
F_SET(ep, F_MODIFIED);
/* Log after change. */
log_line(sp, lno + 1, LOG_LINE_APPEND_F);
/* Update marks, @ and global commands. */
rval = line_insdel(sp, LINE_INSERT, lno + 1);
/*
* Update screen.
*
* comment copied from db_append
* XXX
* Nasty hack. If multiple lines are input by the user, they aren't
* committed until an <ESC> is entered. The problem is the screen was
* updated/scrolled as each line was entered. So, when this routine
* is called to copy the new lines from the cut buffer into the file,
* it has to know not to update the screen again.
*/
return (scr_update(sp, lno + 1, LINE_INSERT, update) || rval);
}
/*
* db_append --
* Append a line into the file.
*
* PUBLIC: int db_append __P((SCR *, int, db_recno_t, CHAR_T *, size_t));
*/
int
db_append(SCR *sp, int update, db_recno_t lno, const CHAR_T *p, size_t len)
{
#if defined(DEBUG) && 0
vtrace(sp, "append to %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
#endif
/* Update file. */
return append(sp, lno, p, len, LINE_APPEND, update);
}
/*
* db_insert --
* Insert a line into the file.
*
* PUBLIC: int db_insert __P((SCR *, db_recno_t, CHAR_T *, size_t));
*/
int
db_insert(SCR *sp, db_recno_t lno, CHAR_T *p, size_t len)
{
#if defined(DEBUG) && 0
vtrace(sp, "insert before %lu: len %lu {%.*s}\n",
(u_long)lno, (u_long)len, MIN(len, 20), p);
#endif
return append(sp, lno - 1, p, len, LINE_INSERT, 1);
}
/*
* db_set --
* Store a line in the file.
*
* PUBLIC: int db_set __P((SCR *, db_recno_t, CHAR_T *, size_t));
*/
int
db_set(SCR *sp, db_recno_t lno, CHAR_T *p, size_t len)
{
DBT data, key;
EXF *ep;
const char *fp;
size_t flen;
#if defined(DEBUG) && 0
vtrace(sp, "replace line %lu: len %lu {%.*s}\n",
(u_long)lno, (u_long)len, MIN(len, 20), p);
#endif
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
if (ep->l_win && ep->l_win != sp->wp) {
ex_emsg(sp, NULL, EXM_LOCKED);
return 1;
}
/* Log before change. */
log_line(sp, lno, LOG_LINE_RESET_B);
INT2FILE(sp, p, len, fp, flen);
/* Update file. */
memset(&key, 0, sizeof(key));
key.data = &lno;
key.size = sizeof(lno);
memset(&data, 0, sizeof(data));
data.data = __UNCONST(fp);
data.size = flen;
if ((sp->db_error = ep->db->put(ep->db, NULL, &key, &data, 0)) != 0) {
msgq(sp, M_DBERR, "006|unable to store line %lu", (u_long)lno);
return (1);
}
/* Flush the cache, update line count, before screen update. */
update_cache(sp, LINE_RESET, lno);
/* File now dirty. */
if (F_ISSET(ep, F_FIRSTMODIFY))
(void)rcv_init(sp);
F_SET(ep, F_MODIFIED);
/* Log after change. */
log_line(sp, lno, LOG_LINE_RESET_F);
/* Update screen. */
return (scr_update(sp, lno, LINE_RESET, 1));
}
/*
* db_exist --
* Return if a line exists.
*
* PUBLIC: int db_exist __P((SCR *, db_recno_t));
*/
int
db_exist(SCR *sp, db_recno_t lno)
{
EXF *ep;
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
if (lno == OOBLNO)
return (0);
/*
* Check the last-line number cache. Adjust the cached line
* number for the lines used by the text input buffers.
*/
if (ep->c_nlines != OOBLNO)
return (lno <= (F_ISSET(sp, SC_TINPUT) ?
ep->c_nlines + (((TEXT *)sp->tiq.cqh_last)->lno -
((TEXT *)sp->tiq.cqh_first)->lno) : ep->c_nlines));
/* Go get the line. */
return (!db_get(sp, lno, 0, NULL, NULL));
}
/*
* db_last --
* Return the number of lines in the file.
*
* PUBLIC: int db_last __P((SCR *, db_recno_t *));
*/
int
db_last(SCR *sp, db_recno_t *lnop)
{
DBT data, key;
DBC *dbcp;
EXF *ep;
db_recno_t lno;
const CHAR_T *wp;
size_t wlen;
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
/*
* Check the last-line number cache. Adjust the cached line
* number for the lines used by the text input buffers.
*/
if (ep->c_nlines != OOBLNO) {
*lnop = ep->c_nlines;
if (F_ISSET(sp, SC_TINPUT))
*lnop += ((TEXT *)sp->tiq.cqh_last)->lno -
((TEXT *)sp->tiq.cqh_first)->lno;
return (0);
}
memset(&key, 0, sizeof(key));
key.data = &lno;
key.size = sizeof(lno);
memset(&data, 0, sizeof(data));
if ((sp->db_error = ep->db->cursor(ep->db, NULL, &dbcp, 0)) != 0)
goto err1;
switch (sp->db_error = dbcp->c_get(dbcp, &key, &data, DB_LAST)) {
case DB_NOTFOUND:
*lnop = 0;
return (0);
default:
(void)dbcp->c_close(dbcp);
alloc_err:
err1:
msgq(sp, M_DBERR, "007|unable to get last line");
*lnop = 0;
return (1);
case 0:
;
}
memcpy(&lno, key.data, sizeof(lno));
if (lno != sp->c_lno) {
FILE2INT(sp, data.data, data.size, wp, wlen);
/* Fill the cache. */
BINC_GOTOW(sp, sp->c_lp, sp->c_blen, wlen);
MEMCPYW(sp->c_lp, wp, wlen);
sp->c_lno = lno;
sp->c_len = wlen;
}
ep->c_nlines = lno;
(void)dbcp->c_close(dbcp);
/* Return the value. */
*lnop = (F_ISSET(sp, SC_TINPUT) &&
((TEXT *)sp->tiq.cqh_last)->lno > lno ?
((TEXT *)sp->tiq.cqh_last)->lno : lno);
return (0);
}
/*
* db_err --
* Report a line error.
*
* PUBLIC: void db_err __P((SCR *, db_recno_t));
*/
void
db_err(SCR *sp, db_recno_t lno)
{
msgq(sp, M_ERR,
"008|Error: unable to retrieve line %lu", (u_long)lno);
}
/*
* scr_update --
* Update all of the screens that are backed by the file that
* just changed.
*
* PUBLIC: int scr_update __P((SCR *sp, db_recno_t lno,
* PUBLIC: lnop_t op, int current));
*/
int
scr_update(SCR *sp, db_recno_t lno, lnop_t op, int current)
{
EXF *ep;
SCR *tsp;
WIN *wp;
if (F_ISSET(sp, SC_EX))
return (0);
/* XXXX goes outside of window */
ep = sp->ep;
if (ep->refcnt != 1)
for (wp = sp->gp->dq.cqh_first; wp != (void *)&sp->gp->dq;
wp = wp->q.cqe_next)
for (tsp = wp->scrq.cqh_first;
tsp != (void *)&wp->scrq; tsp = tsp->q.cqe_next)
if (sp != tsp && tsp->ep == ep)
if (vs_change(tsp, lno, op))
return (1);
return (current ? vs_change(sp, lno, op) : 0);
}
/*
* PUBLIC: void update_cache __P((SCR *sp, lnop_t op, db_recno_t lno));
*/
void
update_cache(SCR *sp, lnop_t op, db_recno_t lno)
{
SCR* scrp;
EXF *ep;
ep = sp->ep;
/* Flush the cache, update line count, before screen update. */
/* The flushing is probably not needed, since it was incorrect
* for db_insert. It might be better to adjust it, like
* marks, @ and global
*/
for (scrp = ep->scrq.cqh_first; scrp != (void *)&ep->scrq;
scrp = scrp->eq.cqe_next)
switch (op) {
case LINE_INSERT:
case LINE_DELETE:
if (lno <= scrp->c_lno)
scrp->c_lno = OOBLNO;
break;
case LINE_RESET:
if (lno == scrp->c_lno)
scrp->c_lno = OOBLNO;
/*FALLTHROUGH*/
case LINE_APPEND:
break;
}
if (ep->c_nlines != OOBLNO)
switch (op) {
case LINE_INSERT:
++ep->c_nlines;
break;
case LINE_DELETE:
--ep->c_nlines;
/*FALLTHROUGH*/
case LINE_APPEND:
case LINE_RESET:
break;
}
}
/*
* PUBLIC: int line_insdel __P((SCR *sp, lnop_t op, db_recno_t lno));
*/
int
line_insdel(SCR *sp, lnop_t op, db_recno_t lno)
{
int rval;
/* Update marks, @ and global commands. */
rval = 0;
if (mark_insdel(sp, op, lno))
rval = 1;
if (ex_g_insdel(sp, op, lno))
rval = 1;
return rval;
}