2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 * Keith Bostic. All rights reserved.
7 * See the LICENSE file for redistribution information.
13 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 $";
16 #include <sys/types.h>
17 #include <sys/queue.h>
20 #include <bitstring.h>
29 static int append
__P((SCR
*, db_recno_t
, CHAR_T
*, size_t, lnop_t
, int));
33 * Front-end to db_get, special case handling for empty files.
35 * PUBLIC: int db_eget __P((SCR *, db_recno_t, CHAR_T **, size_t *, int *));
38 db_eget(SCR
*sp
, db_recno_t lno
, CHAR_T
**pp
, size_t *lenp
, int *isemptyp
)
50 /* If the line exists, simply return it. */
51 if (!db_get(sp
, lno
, 0, pp
, lenp
))
55 * If the user asked for line 0 or line 1, i.e. the only possible
56 * line in an empty file, find the last line of the file; db_last
59 if ((lno
== 0 || lno
== 1) && db_last(sp
, &l1
))
62 /* If the file isn't empty, fail loudly. */
63 if ((lno
!= 0 && lno
!= 1) || l1
!= 0) {
76 * Look in the text buffers for a line, followed by the cache, followed
79 * PUBLIC: int db_get __P((SCR *, db_recno_t, u_int32_t, CHAR_T **, size_t *));
82 db_get(SCR
*sp
, db_recno_t lno
, u_int32_t flags
, CHAR_T
**pp
, size_t *lenp
)
83 /* Line number. */ /* Pointer store. */ /* Length store. */
94 * The underlying recno stuff handles zero by returning NULL, but
95 * have to have an OOB condition for the look-aside into the input
101 /* Check for no underlying file. */
102 if ((ep
= sp
->ep
) == NULL
) {
103 ex_emsg(sp
, NULL
, EXM_NOFILEYET
);
107 if (LF_ISSET(DBG_NOCACHE
))
111 * Look-aside into the TEXT buffers and see if the line we want
114 if (F_ISSET(sp
, SC_TINPUT
)) {
115 l1
= ((TEXT
*)sp
->tiq
.cqh_first
)->lno
;
116 l2
= ((TEXT
*)sp
->tiq
.cqh_last
)->lno
;
117 if (l1
<= lno
&& l2
>= lno
) {
118 #if defined(DEBUG) && 0
120 "retrieve TEXT buffer line %lu\n", (u_long
)lno
);
122 for (tp
= sp
->tiq
.cqh_first
;
123 tp
->lno
!= lno
; tp
= tp
->q
.cqe_next
);
131 * Adjust the line number for the number of lines used
132 * by the text input buffers.
138 /* Look-aside into the cache, and see if the line we want is there. */
140 * Line cache will not work if different screens view the same
141 * file with different encodings.
142 * Multiple threads accessing the same cache can be a problem as
144 * So, line cache is (temporarily) disabled.
146 if (lno
== sp
->c_lno
) {
147 #if defined(DEBUG) && 0
148 vtrace(sp
, "retrieve cached line %lu\n", (u_long
)lno
);
161 /* data.size contains length in bytes */
162 BINC_GOTO(sp
, (char *)sp
->c_lp
, sp
->c_blen
, nlen
);
164 /* Get the line from the underlying database. */
165 memset(&key
, 0, sizeof(key
));
167 key
.size
= sizeof(lno
);
168 memset(&data
, 0, sizeof(data
));
169 data
.data
= sp
->c_lp
;
170 data
.ulen
= sp
->c_blen
;
171 data
.flags
= DB_DBT_USERMEM
;
172 switch (ep
->db
->get(ep
->db
, NULL
, &key
, &data
, 0)) {
179 err1
: if (LF_ISSET(DBG_FATAL
))
180 err2
: db_err(sp
, lno
);
182 err3
: if (lenp
!= NULL
)
191 if (FILE2INT(sp
, data
.data
, data
.size
, wp
, wlen
)) {
192 if (!F_ISSET(sp
, SC_CONV_ERROR
)) {
193 F_SET(sp
, SC_CONV_ERROR
);
194 msgq(sp
, M_ERR
, "324|Conversion error on line %d", lno
);
199 /* Reset the cache. */
200 if (wp
!= data
.data
) {
201 BINC_GOTOW(sp
, sp
->c_lp
, sp
->c_blen
, wlen
);
202 MEMCPYW(sp
->c_lp
, wp
, wlen
);
207 #if defined(DEBUG) && 0
208 vtrace(sp
, "retrieve DB line %lu\n", (u_long
)lno
);
219 * Delete a line from the file.
221 * PUBLIC: int db_delete __P((SCR *, db_recno_t));
224 db_delete(SCR
*sp
, db_recno_t lno
)
229 #if defined(DEBUG) && 0
230 vtrace(sp
, "delete line %lu\n", (u_long
)lno
);
232 /* Check for no underlying file. */
233 if ((ep
= sp
->ep
) == NULL
) {
234 ex_emsg(sp
, NULL
, EXM_NOFILEYET
);
237 if (ep
->l_win
&& ep
->l_win
!= sp
->wp
) {
238 ex_emsg(sp
, NULL
, EXM_LOCKED
);
242 /* Update marks, @ and global commands. */
243 if (line_insdel(sp
, LINE_DELETE
, lno
))
246 /* Log before change. */
247 log_line(sp
, lno
, LOG_LINE_DELETE_B
);
250 memset(&key
, 0, sizeof(key
));
252 key
.size
= sizeof(lno
);
253 if ((sp
->db_error
= ep
->db
->del(ep
->db
, NULL
, &key
, 0)) != 0) {
254 msgq(sp
, M_DBERR
, "003|unable to delete line %lu",
259 /* Flush the cache, update line count, before screen update. */
260 update_cache(sp
, LINE_DELETE
, lno
);
262 /* File now modified. */
263 if (F_ISSET(ep
, F_FIRSTMODIFY
))
265 F_SET(ep
, F_MODIFIED
);
267 /* Log after change. */
268 log_line(sp
, lno
, LOG_LINE_DELETE_F
);
271 return (scr_update(sp
, lno
, LINE_DELETE
, 1));
274 /* maybe this could be simpler
276 * DB3 behaves differently from DB1
278 * if lno != 0 just go to lno and put the new line after it
279 * if lno == 0 then if there are any record, put in front of the first
280 * otherwise just append to the end thus creating the first
284 append(SCR
*sp
, db_recno_t lno
, CHAR_T
*p
, size_t len
, lnop_t op
, int update
)
293 /* Check for no underlying file. */
294 if ((ep
= sp
->ep
) == NULL
) {
295 ex_emsg(sp
, NULL
, EXM_NOFILEYET
);
298 if (ep
->l_win
&& ep
->l_win
!= sp
->wp
) {
299 ex_emsg(sp
, NULL
, EXM_LOCKED
);
303 /* Log before change. */
304 log_line(sp
, lno
+ 1, LOG_LINE_APPEND_B
);
307 memset(&key
, 0, sizeof(key
));
309 key
.size
= sizeof(lno
);
310 memset(&data
, 0, sizeof(data
));
312 if ((sp
->db_error
= ep
->db
->cursor(ep
->db
, NULL
, &dbcp_put
, 0)) != 0)
315 INT2FILE(sp
, p
, len
, fp
, flen
);
318 if ((sp
->db_error
= dbcp_put
->c_get(dbcp_put
, &key
, &data
, DB_SET
)) != 0)
323 if ((sp
->db_error
= dbcp_put
->c_put(dbcp_put
, &key
, &data
, DB_AFTER
)) != 0) {
325 (void)dbcp_put
->c_close(dbcp_put
);
328 ? "004|unable to append to line %lu"
329 : "005|unable to insert at line %lu",
334 if ((sp
->db_error
= dbcp_put
->c_get(dbcp_put
, &key
, &data
, DB_FIRST
)) != 0) {
335 if (sp
->db_error
!= DB_NOTFOUND
)
340 if ((sp
->db_error
= ep
->db
->put(ep
->db
, NULL
, &key
, &data
, DB_APPEND
)) != 0) {
345 key
.size
= sizeof(lno
);
348 if ((sp
->db_error
= dbcp_put
->c_put(dbcp_put
, &key
, &data
, DB_BEFORE
)) != 0) {
354 (void)dbcp_put
->c_close(dbcp_put
);
356 /* Flush the cache, update line count, before screen update. */
357 update_cache(sp
, LINE_INSERT
, lno
);
359 /* File now dirty. */
360 if (F_ISSET(ep
, F_FIRSTMODIFY
))
362 F_SET(ep
, F_MODIFIED
);
364 /* Log after change. */
365 log_line(sp
, lno
+ 1, LOG_LINE_APPEND_F
);
367 /* Update marks, @ and global commands. */
368 rval
= line_insdel(sp
, LINE_INSERT
, lno
+ 1);
373 * comment copied from db_append
375 * Nasty hack. If multiple lines are input by the user, they aren't
376 * committed until an <ESC> is entered. The problem is the screen was
377 * updated/scrolled as each line was entered. So, when this routine
378 * is called to copy the new lines from the cut buffer into the file,
379 * it has to know not to update the screen again.
381 return (scr_update(sp
, lno
+ 1, LINE_INSERT
, update
) || rval
);
386 * Append a line into the file.
388 * PUBLIC: int db_append __P((SCR *, int, db_recno_t, CHAR_T *, size_t));
391 db_append(SCR
*sp
, int update
, db_recno_t lno
, CHAR_T
*p
, size_t len
)
393 #if defined(DEBUG) && 0
394 vtrace(sp
, "append to %lu: len %u {%.*s}\n", lno
, len
, MIN(len
, 20), p
);
398 return append(sp
, lno
, p
, len
, LINE_APPEND
, update
);
403 * Insert a line into the file.
405 * PUBLIC: int db_insert __P((SCR *, db_recno_t, CHAR_T *, size_t));
408 db_insert(SCR
*sp
, db_recno_t lno
, CHAR_T
*p
, size_t len
)
410 #if defined(DEBUG) && 0
411 vtrace(sp
, "insert before %lu: len %lu {%.*s}\n",
412 (u_long
)lno
, (u_long
)len
, MIN(len
, 20), p
);
414 return append(sp
, lno
- 1, p
, len
, LINE_INSERT
, 1);
419 * Store a line in the file.
421 * PUBLIC: int db_set __P((SCR *, db_recno_t, CHAR_T *, size_t));
424 db_set(SCR
*sp
, db_recno_t lno
, CHAR_T
*p
, size_t len
)
431 #if defined(DEBUG) && 0
432 vtrace(sp
, "replace line %lu: len %lu {%.*s}\n",
433 (u_long
)lno
, (u_long
)len
, MIN(len
, 20), p
);
435 /* Check for no underlying file. */
436 if ((ep
= sp
->ep
) == NULL
) {
437 ex_emsg(sp
, NULL
, EXM_NOFILEYET
);
440 if (ep
->l_win
&& ep
->l_win
!= sp
->wp
) {
441 ex_emsg(sp
, NULL
, EXM_LOCKED
);
445 /* Log before change. */
446 log_line(sp
, lno
, LOG_LINE_RESET_B
);
448 INT2FILE(sp
, p
, len
, fp
, flen
);
451 memset(&key
, 0, sizeof(key
));
453 key
.size
= sizeof(lno
);
454 memset(&data
, 0, sizeof(data
));
457 if ((sp
->db_error
= ep
->db
->put(ep
->db
, NULL
, &key
, &data
, 0)) != 0) {
458 msgq(sp
, M_DBERR
, "006|unable to store line %lu", (u_long
)lno
);
462 /* Flush the cache, update line count, before screen update. */
463 update_cache(sp
, LINE_RESET
, lno
);
465 /* File now dirty. */
466 if (F_ISSET(ep
, F_FIRSTMODIFY
))
468 F_SET(ep
, F_MODIFIED
);
470 /* Log after change. */
471 log_line(sp
, lno
, LOG_LINE_RESET_F
);
474 return (scr_update(sp
, lno
, LINE_RESET
, 1));
479 * Return if a line exists.
481 * PUBLIC: int db_exist __P((SCR *, db_recno_t));
484 db_exist(SCR
*sp
, db_recno_t lno
)
488 /* Check for no underlying file. */
489 if ((ep
= sp
->ep
) == NULL
) {
490 ex_emsg(sp
, NULL
, EXM_NOFILEYET
);
498 * Check the last-line number cache. Adjust the cached line
499 * number for the lines used by the text input buffers.
501 if (ep
->c_nlines
!= OOBLNO
)
502 return (lno
<= (F_ISSET(sp
, SC_TINPUT
) ?
503 ep
->c_nlines
+ (((TEXT
*)sp
->tiq
.cqh_last
)->lno
-
504 ((TEXT
*)sp
->tiq
.cqh_first
)->lno
) : ep
->c_nlines
));
506 /* Go get the line. */
507 return (!db_get(sp
, lno
, 0, NULL
, NULL
));
512 * Return the number of lines in the file.
514 * PUBLIC: int db_last __P((SCR *, db_recno_t *));
517 db_last(SCR
*sp
, db_recno_t
*lnop
)
526 /* Check for no underlying file. */
527 if ((ep
= sp
->ep
) == NULL
) {
528 ex_emsg(sp
, NULL
, EXM_NOFILEYET
);
533 * Check the last-line number cache. Adjust the cached line
534 * number for the lines used by the text input buffers.
536 if (ep
->c_nlines
!= OOBLNO
) {
537 *lnop
= ep
->c_nlines
;
538 if (F_ISSET(sp
, SC_TINPUT
))
539 *lnop
+= ((TEXT
*)sp
->tiq
.cqh_last
)->lno
-
540 ((TEXT
*)sp
->tiq
.cqh_first
)->lno
;
544 memset(&key
, 0, sizeof(key
));
546 key
.size
= sizeof(lno
);
547 memset(&data
, 0, sizeof(data
));
549 if ((sp
->db_error
= ep
->db
->cursor(ep
->db
, NULL
, &dbcp
, 0)) != 0)
551 switch (sp
->db_error
= dbcp
->c_get(dbcp
, &key
, &data
, DB_LAST
)) {
556 (void)dbcp
->c_close(dbcp
);
559 msgq(sp
, M_DBERR
, "007|unable to get last line");
566 memcpy(&lno
, key
.data
, sizeof(lno
));
568 if (lno
!= sp
->c_lno
) {
569 FILE2INT(sp
, data
.data
, data
.size
, wp
, wlen
);
571 /* Fill the cache. */
572 BINC_GOTOW(sp
, sp
->c_lp
, sp
->c_blen
, wlen
);
573 MEMCPYW(sp
->c_lp
, wp
, wlen
);
579 (void)dbcp
->c_close(dbcp
);
581 /* Return the value. */
582 *lnop
= (F_ISSET(sp
, SC_TINPUT
) &&
583 ((TEXT
*)sp
->tiq
.cqh_last
)->lno
> lno
?
584 ((TEXT
*)sp
->tiq
.cqh_last
)->lno
: lno
);
590 * Report a line error.
592 * PUBLIC: void db_err __P((SCR *, db_recno_t));
595 db_err(SCR
*sp
, db_recno_t lno
)
598 "008|Error: unable to retrieve line %lu", (u_long
)lno
);
603 * Update all of the screens that are backed by the file that
606 * PUBLIC: int scr_update __P((SCR *sp, db_recno_t lno,
607 * PUBLIC: lnop_t op, int current));
610 scr_update(SCR
*sp
, db_recno_t lno
, lnop_t op
, int current
)
616 if (F_ISSET(sp
, SC_EX
))
619 /* XXXX goes outside of window */
622 for (wp
= sp
->gp
->dq
.cqh_first
; wp
!= (void *)&sp
->gp
->dq
;
624 for (tsp
= wp
->scrq
.cqh_first
;
625 tsp
!= (void *)&wp
->scrq
; tsp
= tsp
->q
.cqe_next
)
626 if (sp
!= tsp
&& tsp
->ep
== ep
)
627 if (vs_change(tsp
, lno
, op
))
629 return (current
? vs_change(sp
, lno
, op
) : 0);
633 * PUBLIC: void update_cache __P((SCR *sp, lnop_t op, db_recno_t lno));
636 update_cache(SCR
*sp
, lnop_t op
, db_recno_t lno
)
643 /* Flush the cache, update line count, before screen update. */
644 /* The flushing is probably not needed, since it was incorrect
645 * for db_insert. It might be better to adjust it, like
646 * marks, @ and global
648 for (scrp
= ep
->scrq
.cqh_first
; scrp
!= (void *)&ep
->scrq
;
649 scrp
= scrp
->eq
.cqe_next
)
653 if (lno
<= scrp
->c_lno
)
654 scrp
->c_lno
= OOBLNO
;
657 if (lno
== scrp
->c_lno
)
658 scrp
->c_lno
= OOBLNO
;
662 if (ep
->c_nlines
!= OOBLNO
)
674 * PUBLIC: int line_insdel __P((SCR *sp, lnop_t op, db_recno_t lno));
677 line_insdel(SCR
*sp
, lnop_t op
, db_recno_t lno
)
681 /* Update marks, @ and global commands. */
683 if (mark_insdel(sp
, op
, lno
))
685 if (ex_g_insdel(sp
, op
, lno
))