another CHAR_T buffer size calculation bug fix
[nvi.git] / vi / vs_refresh.c
blob16df93cd993cd002e49709f5bae46d911c65c2a1
1 /*-
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.
8 */
10 #include "config.h"
12 #ifndef lint
13 static const char sccsid[] = "$Id: vs_refresh.c,v 10.49 2000/07/19 17:05:20 skimo Exp $ (Berkeley) $Date: 2000/07/19 17:05:20 $";
14 #endif /* not lint */
16 #include <sys/types.h>
17 #include <sys/queue.h>
18 #include <sys/time.h>
20 #include <bitstring.h>
21 #include <ctype.h>
22 #include <limits.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
27 #include "../common/common.h"
28 #include "vi.h"
30 #define UPDATE_CURSOR 0x01 /* Update the cursor. */
31 #define UPDATE_SCREEN 0x02 /* Flush to screen. */
33 static void vs_modeline __P((SCR *));
34 static int vs_paint __P((SCR *, u_int));
37 * vs_refresh --
38 * Refresh all screens.
40 * PUBLIC: int vs_refresh __P((SCR *, int));
42 int
43 vs_refresh(sp, forcepaint)
44 SCR *sp;
45 int forcepaint;
47 GS *gp;
48 SCR *tsp;
49 int need_refresh;
50 u_int priv_paint, pub_paint;
52 gp = sp->gp;
55 * 1: Refresh the screen.
57 * If SC_SCR_REDRAW is set in the current screen, repaint everything
58 * that we can find, including status lines.
60 if (F_ISSET(sp, SC_SCR_REDRAW))
61 for (tsp = sp->wp->scrq.cqh_first;
62 tsp != (void *)&sp->wp->scrq; tsp = tsp->q.cqe_next)
63 if (tsp != sp)
64 F_SET(tsp, SC_SCR_REDRAW | SC_STATUS);
67 * 2: Related or dirtied screens, or screens with messages.
69 * If related screens share a view into a file, they may have been
70 * modified as well. Refresh any screens that aren't exiting that
71 * have paint or dirty bits set. Always update their screens, we
72 * are not likely to get another chance. Finally, if we refresh any
73 * screens other than the current one, the cursor will be trashed.
75 pub_paint = SC_SCR_REFORMAT | SC_SCR_REDRAW;
76 priv_paint = VIP_CUR_INVALID | VIP_N_REFRESH;
77 if (O_ISSET(sp, O_NUMBER))
78 priv_paint |= VIP_N_RENUMBER;
79 for (tsp = sp->wp->scrq.cqh_first;
80 tsp != (void *)&sp->wp->scrq; tsp = tsp->q.cqe_next)
81 if (tsp != sp && !F_ISSET(tsp, SC_EXIT | SC_EXIT_FORCE) &&
82 (F_ISSET(tsp, pub_paint) ||
83 F_ISSET(VIP(tsp), priv_paint))) {
84 (void)vs_paint(tsp,
85 (F_ISSET(VIP(tsp), VIP_CUR_INVALID) ?
86 UPDATE_CURSOR : 0) | UPDATE_SCREEN);
87 F_SET(VIP(sp), VIP_CUR_INVALID);
91 * 3: Refresh the current screen.
93 * Always refresh the current screen, it may be a cursor movement.
94 * Also, always do it last -- that way, SC_SCR_REDRAW can be set
95 * in the current screen only, and the screen won't flash.
97 if (vs_paint(sp, UPDATE_CURSOR | (!forcepaint &&
98 F_ISSET(sp, SC_SCR_VI) && KEYS_WAITING(sp) ? 0 : UPDATE_SCREEN)))
99 return (1);
102 * 4: Paint any missing status lines.
104 * XXX
105 * This is fairly evil. Status lines are written using the vi message
106 * mechanism, since we have no idea how long they are. Since we may be
107 * painting screens other than the current one, we don't want to make
108 * the user wait. We depend heavily on there not being any other lines
109 * currently waiting to be displayed and the message truncation code in
110 * the msgq_status routine working.
112 * And, finally, if we updated any status lines, make sure the cursor
113 * gets back to where it belongs.
115 for (need_refresh = 0, tsp = sp->wp->scrq.cqh_first;
116 tsp != (void *)&sp->wp->scrq; tsp = tsp->q.cqe_next)
117 if (F_ISSET(tsp, SC_STATUS)) {
118 need_refresh = 1;
119 vs_resolve(tsp, sp, 0);
121 if (need_refresh)
122 (void)gp->scr_refresh(sp, 0);
125 * A side-effect of refreshing the screen is that it's now ready
126 * for everything else, i.e. messages.
128 F_SET(sp, SC_SCR_VI);
129 return (0);
133 * vs_paint --
134 * This is the guts of the vi curses screen code. The idea is that
135 * the SCR structure passed in contains the new coordinates of the
136 * screen. What makes this hard is that we don't know how big
137 * characters are, doing input can put the cursor in illegal places,
138 * and we're frantically trying to avoid repainting unless it's
139 * absolutely necessary. If you change this code, you'd better know
140 * what you're doing. It's subtle and quick to anger.
142 static int
143 vs_paint(sp, flags)
144 SCR *sp;
145 u_int flags;
147 GS *gp;
148 SMAP *smp, tmp;
149 VI_PRIVATE *vip;
150 db_recno_t lastline, lcnt;
151 size_t cwtotal, cnt, len, notused, off, y;
152 int ch, didpaint, isempty, leftright_warp;
153 CHAR_T *p;
155 #define LNO sp->lno /* Current file line. */
156 #define OLNO vip->olno /* Remembered file line. */
157 #define CNO sp->cno /* Current file column. */
158 #define OCNO vip->ocno /* Remembered file column. */
159 #define SCNO vip->sc_col /* Current screen column. */
161 gp = sp->gp;
162 vip = VIP(sp);
163 didpaint = leftright_warp = 0;
166 * 5: Reformat the lines.
168 * If the lines themselves have changed (:set list, for example),
169 * fill in the map from scratch. Adjust the screen that's being
170 * displayed if the leftright flag is set.
172 if (F_ISSET(sp, SC_SCR_REFORMAT)) {
173 /* Invalidate the line size cache. */
174 VI_SCR_CFLUSH(vip);
176 /* Toss vs_line() cached information. */
177 if (F_ISSET(sp, SC_SCR_TOP)) {
178 if (vs_sm_fill(sp, LNO, P_TOP))
179 return (1);
181 else if (F_ISSET(sp, SC_SCR_CENTER)) {
182 if (vs_sm_fill(sp, LNO, P_MIDDLE))
183 return (1);
184 } else
185 if (vs_sm_fill(sp, OOBLNO, P_TOP))
186 return (1);
187 F_SET(sp, SC_SCR_REDRAW);
191 * 6: Line movement.
193 * Line changes can cause the top line to change as well. As
194 * before, if the movement is large, the screen is repainted.
196 * 6a: Small screens.
198 * Users can use the window, w300, w1200 and w9600 options to make
199 * the screen artificially small. The behavior of these options
200 * in the historic vi wasn't all that consistent, and, in fact, it
201 * was never documented how various screen movements affected the
202 * screen size. Generally, one of three things would happen:
203 * 1: The screen would expand in size, showing the line
204 * 2: The screen would scroll, showing the line
205 * 3: The screen would compress to its smallest size and
206 * repaint.
207 * In general, scrolling didn't cause compression (200^D was handled
208 * the same as ^D), movement to a specific line would (:N where N
209 * was 1 line below the screen caused a screen compress), and cursor
210 * movement would scroll if it was 11 lines or less, and compress if
211 * it was more than 11 lines. (And, no, I have no idea where the 11
212 * comes from.)
214 * What we do is try and figure out if the line is less than half of
215 * a full screen away. If it is, we expand the screen if there's
216 * room, and then scroll as necessary. The alternative is to compress
217 * and repaint.
219 * !!!
220 * This code is a special case from beginning to end. Unfortunately,
221 * home modems are still slow enough that it's worth having.
223 * XXX
224 * If the line a really long one, i.e. part of the line is on the
225 * screen but the column offset is not, we'll end up in the adjust
226 * code, when we should probably have compressed the screen.
228 if (IS_SMALL(sp))
229 if (LNO < HMAP->lno) {
230 lcnt = vs_sm_nlines(sp, HMAP, LNO, sp->t_maxrows);
231 if (lcnt <= HALFSCREEN(sp))
232 for (; lcnt && sp->t_rows != sp->t_maxrows;
233 --lcnt, ++sp->t_rows) {
234 ++TMAP;
235 if (vs_sm_1down(sp))
236 return (1);
238 else
239 goto small_fill;
240 } else if (LNO > TMAP->lno) {
241 lcnt = vs_sm_nlines(sp, TMAP, LNO, sp->t_maxrows);
242 if (lcnt <= HALFSCREEN(sp))
243 for (; lcnt && sp->t_rows != sp->t_maxrows;
244 --lcnt, ++sp->t_rows) {
245 if (vs_sm_next(sp, TMAP, TMAP + 1))
246 return (1);
247 ++TMAP;
248 if (vs_line(sp, TMAP, NULL, NULL))
249 return (1);
251 else {
252 small_fill: (void)gp->scr_move(sp, LASTLINE(sp), 0);
253 (void)gp->scr_clrtoeol(sp);
254 for (; sp->t_rows > sp->t_minrows;
255 --sp->t_rows, --TMAP) {
256 (void)gp->scr_move(sp, TMAP - HMAP, 0);
257 (void)gp->scr_clrtoeol(sp);
259 if (vs_sm_fill(sp, LNO, P_FILL))
260 return (1);
261 F_SET(sp, SC_SCR_REDRAW);
262 goto adjust;
267 * 6b: Line down, or current screen.
269 if (LNO >= HMAP->lno) {
270 /* Current screen. */
271 if (LNO <= TMAP->lno)
272 goto adjust;
273 if (F_ISSET(sp, SC_SCR_TOP))
274 goto top;
275 if (F_ISSET(sp, SC_SCR_CENTER))
276 goto middle;
279 * If less than half a screen above the line, scroll down
280 * until the line is on the screen.
282 lcnt = vs_sm_nlines(sp, TMAP, LNO, HALFTEXT(sp));
283 if (lcnt < HALFTEXT(sp)) {
284 while (lcnt--)
285 if (vs_sm_1up(sp))
286 return (1);
287 goto adjust;
289 goto bottom;
293 * 6c: If not on the current screen, may request center or top.
295 if (F_ISSET(sp, SC_SCR_TOP))
296 goto top;
297 if (F_ISSET(sp, SC_SCR_CENTER))
298 goto middle;
301 * 6d: Line up.
303 lcnt = vs_sm_nlines(sp, HMAP, LNO, HALFTEXT(sp));
304 if (lcnt < HALFTEXT(sp)) {
306 * If less than half a screen below the line, scroll up until
307 * the line is the first line on the screen. Special check so
308 * that if the screen has been emptied, we refill it.
310 if (db_exist(sp, HMAP->lno)) {
311 while (lcnt--)
312 if (vs_sm_1down(sp))
313 return (1);
314 goto adjust;
318 * If less than a half screen from the bottom of the file,
319 * put the last line of the file on the bottom of the screen.
321 bottom: if (db_last(sp, &lastline))
322 return (1);
323 tmp.lno = LNO;
324 tmp.coff = HMAP->coff;
325 tmp.soff = 1;
326 lcnt = vs_sm_nlines(sp, &tmp, lastline+1, sp->t_rows);
327 if (lcnt < HALFTEXT(sp)) {
328 if (vs_sm_fill(sp, lastline, P_BOTTOM))
329 return (1);
330 F_SET(sp, SC_SCR_REDRAW);
331 goto adjust;
333 /* It's not close, just put the line in the middle. */
334 goto middle;
338 * If less than half a screen from the top of the file, put the first
339 * line of the file at the top of the screen. Otherwise, put the line
340 * in the middle of the screen.
342 tmp.lno = 1;
343 tmp.coff = HMAP->coff;
344 tmp.soff = 1;
345 lcnt = vs_sm_nlines(sp, &tmp, LNO, HALFTEXT(sp));
346 if (lcnt < HALFTEXT(sp)) {
347 if (vs_sm_fill(sp, 1, P_TOP))
348 return (1);
349 } else
350 middle: if (vs_sm_fill(sp, LNO, P_MIDDLE))
351 return (1);
352 if (0) {
353 top: if (vs_sm_fill(sp, LNO, P_TOP))
354 return (1);
356 F_SET(sp, SC_SCR_REDRAW);
359 * At this point we know part of the line is on the screen. Since
360 * scrolling is done using logical lines, not physical, all of the
361 * line may not be on the screen. While that's not necessarily bad,
362 * if the part the cursor is on isn't there, we're going to lose.
363 * This can be tricky; if the line covers the entire screen, lno
364 * may be the same as both ends of the map, that's why we test BOTH
365 * the top and the bottom of the map. This isn't a problem for
366 * left-right scrolling, the cursor movement code handles the problem.
368 * There's a performance issue here if editing *really* long lines.
369 * This gets to the right spot by scrolling, and, in a binary, by
370 * scrolling hundreds of lines. If the adjustment looks like it's
371 * going to be a serious problem, refill the screen and repaint.
373 adjust: if (!O_ISSET(sp, O_LEFTRIGHT) &&
374 (LNO == HMAP->lno || LNO == TMAP->lno)) {
375 cnt = vs_screens(sp, LNO, &CNO);
376 if (LNO == HMAP->lno && cnt < HMAP->soff)
377 if ((HMAP->soff - cnt) > HALFTEXT(sp)) {
378 HMAP->soff = cnt;
379 vs_sm_fill(sp, OOBLNO, P_TOP);
380 F_SET(sp, SC_SCR_REDRAW);
381 } else
382 while (cnt < HMAP->soff)
383 if (vs_sm_1down(sp))
384 return (1);
385 if (LNO == TMAP->lno && cnt > TMAP->soff)
386 if ((cnt - TMAP->soff) > HALFTEXT(sp)) {
387 TMAP->soff = cnt;
388 vs_sm_fill(sp, OOBLNO, P_BOTTOM);
389 F_SET(sp, SC_SCR_REDRAW);
390 } else
391 while (cnt > TMAP->soff)
392 if (vs_sm_1up(sp))
393 return (1);
397 * If the screen needs to be repainted, skip cursor optimization.
398 * However, in the code above we skipped leftright scrolling on
399 * the grounds that the cursor code would handle it. Make sure
400 * the right screen is up.
402 if (F_ISSET(sp, SC_SCR_REDRAW)) {
403 if (O_ISSET(sp, O_LEFTRIGHT))
404 goto slow;
405 goto paint;
409 * 7: Cursor movements (current screen only).
411 if (!LF_ISSET(UPDATE_CURSOR))
412 goto number;
415 * Decide cursor position. If the line has changed, the cursor has
416 * moved over a tab, or don't know where the cursor was, reparse the
417 * line. Otherwise, we've just moved over fixed-width characters,
418 * and can calculate the left/right scrolling and cursor movement
419 * without reparsing the line. Note that we don't know which (if any)
420 * of the characters between the old and new cursor positions changed.
422 * XXX
423 * With some work, it should be possible to handle tabs quickly, at
424 * least in obvious situations, like moving right and encountering
425 * a tab, without reparsing the whole line.
427 * If the line we're working with has changed, reread it..
429 if (F_ISSET(vip, VIP_CUR_INVALID) || LNO != OLNO)
430 goto slow;
432 /* Otherwise, if nothing's changed, ignore the cursor. */
433 if (CNO == OCNO)
434 goto fast;
437 * Get the current line. If this fails, we either have an empty
438 * file and can just repaint, or there's a real problem. This
439 * isn't a performance issue because there aren't any ways to get
440 * here repeatedly.
442 if (db_eget(sp, LNO, &p, &len, &isempty)) {
443 if (isempty)
444 goto slow;
445 return (1);
448 #ifdef DEBUG
449 /* Sanity checking. */
450 if (CNO >= len && len != 0) {
451 msgq(sp, M_ERR, "Error: %s/%d: cno (%u) >= len (%u)",
452 tail(__FILE__), __LINE__, CNO, len);
453 return (1);
455 #endif
457 * The basic scheme here is to look at the characters in between
458 * the old and new positions and decide how big they are on the
459 * screen, and therefore, how many screen positions to move.
461 if (CNO < OCNO) {
463 * 7a: Cursor moved left.
465 * Point to the old character. The old cursor position can
466 * be past EOL if, for example, we just deleted the rest of
467 * the line. In this case, since we don't know the width of
468 * the characters we traversed, we have to do it slowly.
470 p += OCNO;
471 cnt = (OCNO - CNO) + 1;
472 if (OCNO >= len)
473 goto slow;
476 * Quick sanity check -- it's hard to figure out exactly when
477 * we cross a screen boundary as we do in the cursor right
478 * movement. If cnt is so large that we're going to cross the
479 * boundary no matter what, stop now.
481 if (SCNO + 1 + MAX_CHARACTER_COLUMNS < cnt)
482 goto slow;
485 * Count up the widths of the characters. If it's a tab
486 * character, go do it the the slow way.
488 for (cwtotal = 0; cnt--; cwtotal += KEY_COL(sp, ch))
489 if ((ch = *(UCHAR_T *)p--) == '\t')
490 goto slow;
493 * Decrement the screen cursor by the total width of the
494 * characters minus 1.
496 cwtotal -= 1;
499 * If we're moving left, and there's a wide character in the
500 * current position, go to the end of the character.
502 if (KEY_COL(sp, ch) > 1)
503 cwtotal -= KEY_COL(sp, ch) - 1;
506 * If the new column moved us off of the current logical line,
507 * calculate a new one. If doing leftright scrolling, we've
508 * moved off of the current screen, as well.
510 if (SCNO < cwtotal)
511 goto slow;
512 SCNO -= cwtotal;
513 } else {
515 * 7b: Cursor moved right.
517 * Point to the first character to the right.
519 p += OCNO + 1;
520 cnt = CNO - OCNO;
523 * Count up the widths of the characters. If it's a tab
524 * character, go do it the the slow way. If we cross a
525 * screen boundary, we can quit.
527 for (cwtotal = SCNO; cnt--;) {
528 if ((ch = *(UCHAR_T *)p++) == '\t')
529 goto slow;
530 if ((cwtotal += KEY_COL(sp, ch)) >= SCREEN_COLS(sp))
531 break;
535 * Increment the screen cursor by the total width of the
536 * characters.
538 SCNO = cwtotal;
540 /* See screen change comment in section 6a. */
541 if (SCNO >= SCREEN_COLS(sp))
542 goto slow;
546 * 7c: Fast cursor update.
548 * We have the current column, retrieve the current row.
550 fast: (void)gp->scr_cursor(sp, &y, &notused);
551 goto done_cursor;
554 * 7d: Slow cursor update.
556 * Walk through the map and find the current line.
558 slow: for (smp = HMAP; smp->lno != LNO; ++smp);
561 * 7e: Leftright scrolling adjustment.
563 * If doing left-right scrolling and the cursor movement has changed
564 * the displayed screen, scroll the screen left or right, unless we're
565 * updating the info line in which case we just scroll that one line.
566 * We adjust the offset up or down until we have a window that covers
567 * the current column, making sure that we adjust differently for the
568 * first screen as compared to subsequent ones.
570 if (O_ISSET(sp, O_LEFTRIGHT)) {
572 * Get the screen column for this character, and correct
573 * for the number option offset.
575 cnt = vs_columns(sp, NULL, LNO, &CNO, NULL);
576 if (O_ISSET(sp, O_NUMBER))
577 cnt -= O_NUMBER_LENGTH;
579 /* Adjust the window towards the beginning of the line. */
580 off = smp->coff;
581 if (off >= cnt) {
582 do {
583 if (off >= O_VAL(sp, O_SIDESCROLL))
584 off -= O_VAL(sp, O_SIDESCROLL);
585 else {
586 off = 0;
587 break;
589 } while (off >= cnt);
590 goto shifted;
593 /* Adjust the window towards the end of the line. */
594 if (off == 0 && off + SCREEN_COLS(sp) < cnt ||
595 off != 0 && off + sp->cols < cnt) {
596 do {
597 off += O_VAL(sp, O_SIDESCROLL);
598 } while (off + sp->cols < cnt);
600 shifted: /* Fill in screen map with the new offset. */
601 if (F_ISSET(sp, SC_TINPUT_INFO))
602 smp->coff = off;
603 else {
604 for (smp = HMAP; smp <= TMAP; ++smp)
605 smp->coff = off;
606 leftright_warp = 1;
608 goto paint;
612 * We may have jumped here to adjust a leftright screen because
613 * redraw was set. If so, we have to paint the entire screen.
615 if (F_ISSET(sp, SC_SCR_REDRAW))
616 goto paint;
620 * Update the screen lines for this particular file line until we
621 * have a new screen cursor position.
623 for (y = -1,
624 vip->sc_smap = NULL; smp <= TMAP && smp->lno == LNO; ++smp) {
625 if (vs_line(sp, smp, &y, &SCNO))
626 return (1);
627 if (y != -1) {
628 vip->sc_smap = smp;
629 break;
632 goto done_cursor;
635 * 8: Repaint the entire screen.
637 * Lost big, do what you have to do. We flush the cache, since
638 * SC_SCR_REDRAW gets set when the screen isn't worth fixing, and
639 * it's simpler to repaint. So, don't trust anything that we
640 * think we know about it.
642 paint: for (smp = HMAP; smp <= TMAP; ++smp)
643 SMAP_FLUSH(smp);
644 for (y = -1, vip->sc_smap = NULL, smp = HMAP; smp <= TMAP; ++smp) {
645 if (vs_line(sp, smp, &y, &SCNO))
646 return (1);
647 if (y != -1 && vip->sc_smap == NULL)
648 vip->sc_smap = smp;
651 * If it's a small screen and we're redrawing, clear the unused lines,
652 * ex may have overwritten them.
654 if (F_ISSET(sp, SC_SCR_REDRAW) && IS_SMALL(sp))
655 for (cnt = sp->t_rows; cnt <= sp->t_maxrows; ++cnt) {
656 (void)gp->scr_move(sp, cnt, 0);
657 (void)gp->scr_clrtoeol(sp);
660 didpaint = 1;
662 done_cursor:
664 * Sanity checking. When the repainting code messes up, the usual
665 * result is we don't repaint the cursor and so sc_smap will be
666 * NULL. If we're debugging, die, otherwise restart from scratch.
668 #ifdef DEBUG
669 if (vip->sc_smap == NULL) {
670 fprintf(stderr, "smap error\n");
671 sleep(100);
672 abort();
674 #else
675 if (vip->sc_smap == NULL) {
676 F_SET(sp, SC_SCR_REFORMAT);
677 return (vs_paint(sp, flags));
679 #endif
682 * 9: Set the remembered cursor values.
684 OCNO = CNO;
685 OLNO = LNO;
688 * 10: Repaint the line numbers.
690 * If O_NUMBER is set and the VIP_N_RENUMBER bit is set, and we
691 * didn't repaint the screen, repaint all of the line numbers,
692 * they've changed.
694 number: if (O_ISSET(sp, O_NUMBER) &&
695 F_ISSET(vip, VIP_N_RENUMBER) && !didpaint && vs_number(sp))
696 return (1);
699 * 11: Update the mode line, position the cursor, and flush changes.
701 * If we warped the screen, we have to refresh everything.
703 if (leftright_warp)
704 LF_SET(UPDATE_CURSOR | UPDATE_SCREEN);
706 if (LF_ISSET(UPDATE_SCREEN) && !IS_ONELINE(sp) &&
707 !F_ISSET(vip, VIP_S_MODELINE) && !F_ISSET(sp, SC_TINPUT_INFO))
708 vs_modeline(sp);
710 if (LF_ISSET(UPDATE_CURSOR)) {
711 (void)gp->scr_move(sp, y, SCNO);
714 * XXX
715 * If the screen shifted, we recalculate the "most favorite"
716 * cursor position. Vi won't know that we've warped the
717 * screen, so it's going to have a wrong idea about where the
718 * cursor should be. This is vi's problem, and fixing it here
719 * is a gross layering violation.
721 if (leftright_warp)
722 (void)vs_column(sp, &sp->rcm);
725 if (LF_ISSET(UPDATE_SCREEN))
726 (void)gp->scr_refresh(sp, F_ISSET(vip, VIP_N_EX_PAINT));
728 /* 12: Clear the flags that are handled by this routine. */
729 F_CLR(sp, SC_SCR_CENTER | SC_SCR_REDRAW | SC_SCR_REFORMAT | SC_SCR_TOP);
730 F_CLR(vip, VIP_CUR_INVALID |
731 VIP_N_EX_PAINT | VIP_N_REFRESH | VIP_N_RENUMBER | VIP_S_MODELINE);
733 return (0);
735 #undef LNO
736 #undef OLNO
737 #undef CNO
738 #undef OCNO
739 #undef SCNO
743 * vs_modeline --
744 * Update the mode line.
746 static void
747 vs_modeline(sp)
748 SCR *sp;
750 static char * const modes[] = {
751 "215|Append", /* SM_APPEND */
752 "216|Change", /* SM_CHANGE */
753 "217|Command", /* SM_COMMAND */
754 "218|Insert", /* SM_INSERT */
755 "219|Replace", /* SM_REPLACE */
757 GS *gp;
758 size_t cols, curcol, curlen, endpoint, len, midpoint;
759 const char *t;
760 int ellipsis;
761 char *p, buf[20];
763 gp = sp->gp;
766 * We put down the file name, the ruler, the mode and the dirty flag.
767 * If there's not enough room, there's not enough room, we don't play
768 * any special games. We try to put the ruler in the middle and the
769 * mode and dirty flag at the end.
771 * !!!
772 * Leave the last character blank, in case it's a really dumb terminal
773 * with hardware scroll. Second, don't paint the last character in the
774 * screen, SunOS 4.1.1 and Ultrix 4.2 curses won't let you.
776 * Move to the last line on the screen.
778 (void)gp->scr_move(sp, LASTLINE(sp), 0);
780 /* If more than one screen in the display, show the file name. */
781 curlen = 0;
782 if (IS_SPLIT(sp)) {
783 for (p = sp->frp->name; *p != '\0'; ++p);
784 for (ellipsis = 0, cols = sp->cols / 2; --p > sp->frp->name;) {
785 if (*p == '/') {
786 ++p;
787 break;
789 if ((curlen += KEY_LEN(sp, *p)) > cols) {
790 ellipsis = 3;
791 curlen +=
792 KEY_LEN(sp, '.') * 3 + KEY_LEN(sp, ' ');
793 while (curlen > cols) {
794 ++p;
795 curlen -= KEY_LEN(sp, *p);
797 break;
800 if (ellipsis) {
801 while (ellipsis--)
802 (void)gp->scr_addstr(sp,
803 KEY_NAME(sp, '.'), KEY_LEN(sp, '.'));
804 (void)gp->scr_addstr(sp,
805 KEY_NAME(sp, ' '), KEY_LEN(sp, ' '));
807 for (; *p != '\0'; ++p)
808 (void)gp->scr_addstr(sp,
809 KEY_NAME(sp, *p), KEY_LEN(sp, *p));
812 /* Clear the rest of the line. */
813 (void)gp->scr_clrtoeol(sp);
816 * Display the ruler. If we're not at the midpoint yet, move there.
817 * Otherwise, add in two extra spaces.
819 * Adjust the current column for the fact that the editor uses it as
820 * a zero-based number.
822 * XXX
823 * Assume that numbers, commas, and spaces only take up a single
824 * column on the screen.
826 cols = sp->cols - 1;
827 if (O_ISSET(sp, O_RULER)) {
828 vs_column(sp, &curcol);
829 len =
830 snprintf(buf, sizeof(buf), "%lu,%lu", sp->lno, curcol + 1);
832 midpoint = (cols - ((len + 1) / 2)) / 2;
833 if (curlen < midpoint) {
834 (void)gp->scr_move(sp, LASTLINE(sp), midpoint);
835 curlen += len;
836 } else if (curlen + 2 + len < cols) {
837 (void)gp->scr_addstr(sp, " ", 2);
838 curlen += 2 + len;
840 (void)gp->scr_addstr(sp, buf, len);
844 * Display the mode and the modified flag, as close to the end of the
845 * line as possible, but guaranteeing at least two spaces between the
846 * ruler and the modified flag.
848 #define MODESIZE 9
849 endpoint = cols;
850 if (O_ISSET(sp, O_SHOWMODE)) {
851 if (F_ISSET(sp->ep, F_MODIFIED))
852 --endpoint;
853 t = msg_cat(sp, modes[sp->showmode], &len);
854 endpoint -= len;
857 if (endpoint > curlen + 2) {
858 (void)gp->scr_move(sp, LASTLINE(sp), endpoint);
859 if (O_ISSET(sp, O_SHOWMODE)) {
860 if (F_ISSET(sp->ep, F_MODIFIED))
861 (void)gp->scr_addstr(sp,
862 KEY_NAME(sp, '*'), KEY_LEN(sp, '*'));
863 (void)gp->scr_addstr(sp, t, len);