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[] = "@(#)line.c 10.21 (Berkeley) 9/15/96";
16 #include <sys/types.h>
17 #include <sys/queue.h>
20 #include <bitstring.h>
29 static int scr_update __P((SCR *, recno_t, lnop_t, int));
33 * Front-end to db_get, special case handling for empty files.
35 * PUBLIC: int db_eget __P((SCR *, recno_t, char **, size_t *, int *));
38 db_eget(sp, lno, pp, lenp, isemptyp)
40 recno_t lno; /* Line number. */
41 char **pp; /* Pointer store. */
42 size_t *lenp; /* Length store. */
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 *, recno_t, u_int32_t, char **, size_t *));
82 db_get(sp, lno, flags, pp, lenp)
84 recno_t lno; /* Line number. */
86 char **pp; /* Pointer store. */
87 size_t *lenp; /* Length store. */
95 * The underlying recno stuff handles zero by returning NULL, but
96 * have to have an OOB condition for the look-aside into the input
102 /* Check for no underlying file. */
103 if ((ep = sp->ep) == NULL) {
104 ex_emsg(sp, NULL, EXM_NOFILEYET);
108 if (LF_ISSET(DBG_NOCACHE))
112 * Look-aside into the TEXT buffers and see if the line we want
115 if (F_ISSET(sp, SC_TINPUT)) {
116 l1 = ((TEXT *)sp->tiq.cqh_first)->lno;
117 l2 = ((TEXT *)sp->tiq.cqh_last)->lno;
118 if (l1 <= lno && l2 >= lno) {
119 #if defined(DEBUG) && 0
120 TRACE(sp, "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. */
139 if (lno == ep->c_lno) {
140 #if defined(DEBUG) && 0
141 TRACE(sp, "retrieve cached line %lu\n", (u_long)lno);
152 /* Get the line from the underlying database. */
154 key.size = sizeof(lno);
155 switch (ep->db->get(ep->db, &key, &data, 0)) {
159 err1: if (LF_ISSET(DBG_FATAL))
160 err2: db_err(sp, lno);
161 err3: if (lenp != NULL)
168 /* Reset the cache. */
170 ep->c_len = data.size;
171 ep->c_lp = data.data;
173 #if defined(DEBUG) && 0
174 TRACE(sp, "retrieve DB line %lu\n", (u_long)lno);
185 * Delete a line from the file.
187 * PUBLIC: int db_delete __P((SCR *, recno_t));
197 #if defined(DEBUG) && 0
198 TRACE(sp, "delete line %lu\n", (u_long)lno);
200 /* Check for no underlying file. */
201 if ((ep = sp->ep) == NULL) {
202 ex_emsg(sp, NULL, EXM_NOFILEYET);
206 /* Update marks, @ and global commands. */
207 if (mark_insdel(sp, LINE_DELETE, lno))
209 if (ex_g_insdel(sp, LINE_DELETE, lno))
213 log_line(sp, lno, LOG_LINE_DELETE);
217 key.size = sizeof(lno);
219 if (ep->db->del(ep->db, &key, 0) == 1) {
221 "003|unable to delete line %lu", (u_long)lno);
226 /* Flush the cache, update line count, before screen update. */
227 if (lno <= ep->c_lno)
229 if (ep->c_nlines != OOBLNO)
232 /* File now modified. */
233 if (F_ISSET(ep, F_FIRSTMODIFY))
235 F_SET(ep, F_MODIFIED);
238 return (scr_update(sp, lno, LINE_DELETE, 1));
243 * Append a line into the file.
245 * PUBLIC: int db_append __P((SCR *, int, recno_t, char *, size_t));
248 db_append(sp, update, lno, p, len)
259 #if defined(DEBUG) && 0
260 TRACE(sp, "append to %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
262 /* Check for no underlying file. */
263 if ((ep = sp->ep) == NULL) {
264 ex_emsg(sp, NULL, EXM_NOFILEYET);
270 key.size = sizeof(lno);
274 if (ep->db->put(ep->db, &key, &data, R_IAFTER) == -1) {
276 "004|unable to append to line %lu", (u_long)lno);
281 /* Flush the cache, update line count, before screen update. */
284 if (ep->c_nlines != OOBLNO)
287 /* File now dirty. */
288 if (F_ISSET(ep, F_FIRSTMODIFY))
290 F_SET(ep, F_MODIFIED);
293 log_line(sp, lno + 1, LOG_LINE_APPEND);
295 /* Update marks, @ and global commands. */
297 if (mark_insdel(sp, LINE_INSERT, lno + 1))
299 if (ex_g_insdel(sp, LINE_INSERT, lno + 1))
306 * Nasty hack. If multiple lines are input by the user, they aren't
307 * committed until an <ESC> is entered. The problem is the screen was
308 * updated/scrolled as each line was entered. So, when this routine
309 * is called to copy the new lines from the cut buffer into the file,
310 * it has to know not to update the screen again.
312 return (scr_update(sp, lno, LINE_APPEND, update) || rval);
317 * Insert a line into the file.
319 * PUBLIC: int db_insert __P((SCR *, recno_t, char *, size_t));
322 db_insert(sp, lno, p, len)
332 #if defined(DEBUG) && 0
333 TRACE(sp, "insert before %lu: len %lu {%.*s}\n",
334 (u_long)lno, (u_long)len, MIN(len, 20), p);
336 /* Check for no underlying file. */
337 if ((ep = sp->ep) == NULL) {
338 ex_emsg(sp, NULL, EXM_NOFILEYET);
344 key.size = sizeof(lno);
348 if (ep->db->put(ep->db, &key, &data, R_IBEFORE) == -1) {
350 "005|unable to insert at line %lu", (u_long)lno);
355 /* Flush the cache, update line count, before screen update. */
356 if (lno >= ep->c_lno)
358 if (ep->c_nlines != OOBLNO)
361 /* File now dirty. */
362 if (F_ISSET(ep, F_FIRSTMODIFY))
364 F_SET(ep, F_MODIFIED);
367 log_line(sp, lno, LOG_LINE_INSERT);
369 /* Update marks, @ and global commands. */
371 if (mark_insdel(sp, LINE_INSERT, lno))
373 if (ex_g_insdel(sp, LINE_INSERT, lno))
377 return (scr_update(sp, lno, LINE_INSERT, 1) || rval);
382 * Store a line in the file.
384 * PUBLIC: int db_set __P((SCR *, recno_t, char *, size_t));
387 db_set(sp, lno, p, len)
396 #if defined(DEBUG) && 0
397 TRACE(sp, "replace line %lu: len %lu {%.*s}\n",
398 (u_long)lno, (u_long)len, MIN(len, 20), p);
401 /* Check for no underlying file. */
402 if ((ep = sp->ep) == NULL) {
403 ex_emsg(sp, NULL, EXM_NOFILEYET);
407 /* Log before change. */
408 log_line(sp, lno, LOG_LINE_RESET_B);
412 key.size = sizeof(lno);
416 if (ep->db->put(ep->db, &key, &data, 0) == -1) {
418 "006|unable to store line %lu", (u_long)lno);
423 /* Flush the cache, before logging or screen update. */
424 if (lno == ep->c_lno)
427 /* File now dirty. */
428 if (F_ISSET(ep, F_FIRSTMODIFY))
430 F_SET(ep, F_MODIFIED);
432 /* Log after change. */
433 log_line(sp, lno, LOG_LINE_RESET_F);
436 return (scr_update(sp, lno, LINE_RESET, 1));
441 * Return if a line exists.
443 * PUBLIC: int db_exist __P((SCR *, recno_t));
452 /* Check for no underlying file. */
453 if ((ep = sp->ep) == NULL) {
454 ex_emsg(sp, NULL, EXM_NOFILEYET);
462 * Check the last-line number cache. Adjust the cached line
463 * number for the lines used by the text input buffers.
465 if (ep->c_nlines != OOBLNO)
466 return (lno <= (F_ISSET(sp, SC_TINPUT) ?
467 ep->c_nlines + (((TEXT *)sp->tiq.cqh_last)->lno -
468 ((TEXT *)sp->tiq.cqh_first)->lno) : ep->c_nlines));
470 /* Go get the line. */
471 return (!db_get(sp, lno, 0, NULL, NULL));
476 * Return the number of lines in the file.
478 * PUBLIC: int db_last __P((SCR *, recno_t *));
489 /* Check for no underlying file. */
490 if ((ep = sp->ep) == NULL) {
491 ex_emsg(sp, NULL, EXM_NOFILEYET);
496 * Check the last-line number cache. Adjust the cached line
497 * number for the lines used by the text input buffers.
499 if (ep->c_nlines != OOBLNO) {
500 *lnop = ep->c_nlines;
501 if (F_ISSET(sp, SC_TINPUT))
502 *lnop += ((TEXT *)sp->tiq.cqh_last)->lno -
503 ((TEXT *)sp->tiq.cqh_first)->lno;
508 key.size = sizeof(lno);
510 switch (ep->db->seq(ep->db, &key, &data, R_LAST)) {
512 msgq(sp, M_SYSERR, "007|unable to get last line");
522 /* Fill the cache. */
523 memcpy(&lno, key.data, sizeof(lno));
524 ep->c_nlines = ep->c_lno = lno;
525 ep->c_len = data.size;
526 ep->c_lp = data.data;
528 /* Return the value. */
529 *lnop = (F_ISSET(sp, SC_TINPUT) &&
530 ((TEXT *)sp->tiq.cqh_last)->lno > lno ?
531 ((TEXT *)sp->tiq.cqh_last)->lno : lno);
537 * Report a line error.
539 * PUBLIC: void db_err __P((SCR *, recno_t));
547 "008|Error: unable to retrieve line %lu", (u_long)lno);
552 * Update all of the screens that are backed by the file that
556 scr_update(sp, lno, op, current)
565 if (F_ISSET(sp, SC_EX))
570 for (tsp = sp->gp->dq.cqh_first;
571 tsp != (void *)&sp->gp->dq; tsp = tsp->q.cqe_next)
572 if (sp != tsp && tsp->ep == ep)
573 if (vs_change(tsp, lno, op))
575 return (current ? vs_change(sp, lno, op) : 0);