1 /* $NetBSD: vs_refresh.c,v 1.6 2014/01/26 21:43:45 christos Exp $ */
2 /*-
3 * Copyright (c) 1992, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 1992, 1993, 1994, 1995, 1996
6 * Keith Bostic. All rights reserved.
7 *
8 * See the LICENSE file for redistribution information.
9 */
10
11 #include "config.h"
12
13 #include <sys/cdefs.h>
14 #if 0
15 #ifndef lint
16 static const char sccsid[] = "Id: vs_refresh.c,v 10.50 2001/06/25 15:19:37 skimo Exp (Berkeley) Date: 2001/06/25 15:19:37 ";
17 #endif /* not lint */
18 #else
19 __RCSID("$NetBSD: vs_refresh.c,v 1.6 2014/01/26 21:43:45 christos Exp $");
20 #endif
21
22 #include <sys/types.h>
23 #include <sys/queue.h>
24 #include <sys/time.h>
25
26 #include <bitstring.h>
27 #include <ctype.h>
28 #include <limits.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32
33 #include "../common/common.h"
34 #include "vi.h"
35
36 #define UPDATE_CURSOR 0x01 /* Update the cursor. */
37 #define UPDATE_SCREEN 0x02 /* Flush to screen. */
38
39 static void vs_modeline __P((SCR *));
40 static int vs_paint __P((SCR *, u_int));
41
42 /*
43 * vs_refresh --
44 * Refresh all screens.
45 *
46 * PUBLIC: int vs_refresh __P((SCR *, int));
47 */
48 int
vs_refresh(SCR * sp,int forcepaint)49 vs_refresh(SCR *sp, int forcepaint)
50 {
51 GS *gp;
52 SCR *tsp;
53 int need_refresh;
54 u_int priv_paint, pub_paint;
55
56 gp = sp->gp;
57
58 /*
59 * 1: Refresh the screen.
60 *
61 * If SC_SCR_REDRAW is set in the current screen, repaint everything
62 * that we can find, including status lines.
63 */
64 if (F_ISSET(sp, SC_SCR_REDRAW))
65 TAILQ_FOREACH(tsp, &sp->wp->scrq, q)
66 if (tsp != sp)
67 F_SET(tsp, SC_SCR_REDRAW | SC_STATUS);
68
69 /*
70 * 2: Related or dirtied screens, or screens with messages.
71 *
72 * If related screens share a view into a file, they may have been
73 * modified as well. Refresh any screens that aren't exiting that
74 * have paint or dirty bits set. Always update their screens, we
75 * are not likely to get another chance. Finally, if we refresh any
76 * screens other than the current one, the cursor will be trashed.
77 */
78 pub_paint = SC_SCR_REFORMAT | SC_SCR_REDRAW;
79 priv_paint = VIP_CUR_INVALID | VIP_N_REFRESH;
80 if (O_ISSET(sp, O_NUMBER))
81 priv_paint |= VIP_N_RENUMBER;
82 TAILQ_FOREACH(tsp, &sp->wp->scrq, q)
83 if (tsp != sp && !F_ISSET(tsp, SC_EXIT | SC_EXIT_FORCE) &&
84 (F_ISSET(tsp, pub_paint) ||
85 F_ISSET(VIP(tsp), priv_paint))) {
86 (void)vs_paint(tsp,
87 (F_ISSET(VIP(tsp), VIP_CUR_INVALID) ?
88 UPDATE_CURSOR : 0) | UPDATE_SCREEN);
89 F_SET(VIP(sp), VIP_CUR_INVALID);
90 }
91
92 /*
93 * 3: Refresh the current screen.
94 *
95 * Always refresh the current screen, it may be a cursor movement.
96 * Also, always do it last -- that way, SC_SCR_REDRAW can be set
97 * in the current screen only, and the screen won't flash.
98 */
99 if (vs_paint(sp, UPDATE_CURSOR | (!forcepaint &&
100 F_ISSET(sp, SC_SCR_VI) && KEYS_WAITING(sp) ? 0 : UPDATE_SCREEN)))
101 return (1);
102
103 /*
104 * 4: Paint any missing status lines.
105 *
106 * XXX
107 * This is fairly evil. Status lines are written using the vi message
108 * mechanism, since we have no idea how long they are. Since we may be
109 * painting screens other than the current one, we don't want to make
110 * the user wait. We depend heavily on there not being any other lines
111 * currently waiting to be displayed and the message truncation code in
112 * the msgq_status routine working.
113 *
114 * And, finally, if we updated any status lines, make sure the cursor
115 * gets back to where it belongs.
116 */
117 need_refresh = 0;
118 TAILQ_FOREACH(tsp, &sp->wp->scrq, q)
119 if (F_ISSET(tsp, SC_STATUS)) {
120 need_refresh = 1;
121 vs_resolve(tsp, sp, 0);
122 }
123 if (need_refresh)
124 (void)gp->scr_refresh(sp, 0);
125
126 /*
127 * A side-effect of refreshing the screen is that it's now ready
128 * for everything else, i.e. messages.
129 */
130 F_SET(sp, SC_SCR_VI);
131 return (0);
132 }
133
134 /*
135 * vs_paint --
136 * This is the guts of the vi curses screen code. The idea is that
137 * the SCR structure passed in contains the new coordinates of the
138 * screen. What makes this hard is that we don't know how big
139 * characters are, doing input can put the cursor in illegal places,
140 * and we're frantically trying to avoid repainting unless it's
141 * absolutely necessary. If you change this code, you'd better know
142 * what you're doing. It's subtle and quick to anger.
143 */
144 static int
vs_paint(SCR * sp,u_int flags)145 vs_paint(SCR *sp, u_int flags)
146 {
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 = 0, didpaint, isempty, leftright_warp;
153 CHAR_T *p;
154
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. */
160
161 gp = sp->gp;
162 vip = VIP(sp);
163 if (vip == NULL)
164 return 0;
165 didpaint = leftright_warp = 0;
166
167 /*
168 * 5: Reformat the lines.
169 *
170 * If the lines themselves have changed (:set list, for example),
171 * fill in the map from scratch. Adjust the screen that's being
172 * displayed if the leftright flag is set.
173 */
174 if (F_ISSET(sp, SC_SCR_REFORMAT)) {
175 /* Invalidate the line size cache. */
176 VI_SCR_CFLUSH(vip);
177
178 /* Toss vs_line() cached information. */
179 if (F_ISSET(sp, SC_SCR_TOP)) {
180 if (vs_sm_fill(sp, LNO, P_TOP))
181 return (1);
182 }
183 else if (F_ISSET(sp, SC_SCR_CENTER)) {
184 if (vs_sm_fill(sp, LNO, P_MIDDLE))
185 return (1);
186 } else
187 if (vs_sm_fill(sp, OOBLNO, P_TOP))
188 return (1);
189 F_SET(sp, SC_SCR_REDRAW);
190 }
191
192 /*
193 * 6: Line movement.
194 *
195 * Line changes can cause the top line to change as well. As
196 * before, if the movement is large, the screen is repainted.
197 *
198 * 6a: Small screens.
199 *
200 * Users can use the window, w300, w1200 and w9600 options to make
201 * the screen artificially small. The behavior of these options
202 * in the historic vi wasn't all that consistent, and, in fact, it
203 * was never documented how various screen movements affected the
204 * screen size. Generally, one of three things would happen:
205 * 1: The screen would expand in size, showing the line
206 * 2: The screen would scroll, showing the line
207 * 3: The screen would compress to its smallest size and
208 * repaint.
209 * In general, scrolling didn't cause compression (200^D was handled
210 * the same as ^D), movement to a specific line would (:N where N
211 * was 1 line below the screen caused a screen compress), and cursor
212 * movement would scroll if it was 11 lines or less, and compress if
213 * it was more than 11 lines. (And, no, I have no idea where the 11
214 * comes from.)
215 *
216 * What we do is try and figure out if the line is less than half of
217 * a full screen away. If it is, we expand the screen if there's
218 * room, and then scroll as necessary. The alternative is to compress
219 * and repaint.
220 *
221 * !!!
222 * This code is a special case from beginning to end. Unfortunately,
223 * home modems are still slow enough that it's worth having.
224 *
225 * XXX
226 * If the line a really long one, i.e. part of the line is on the
227 * screen but the column offset is not, we'll end up in the adjust
228 * code, when we should probably have compressed the screen.
229 */
230 if (IS_SMALL(sp)) {
231 if (LNO < HMAP->lno) {
232 lcnt = vs_sm_nlines(sp, HMAP, LNO, sp->t_maxrows);
233 if (lcnt <= HALFSCREEN(sp))
234 for (; lcnt && sp->t_rows != sp->t_maxrows;
235 --lcnt, ++sp->t_rows) {
236 ++TMAP;
237 if (vs_sm_1down(sp))
238 return (1);
239 }
240 else
241 goto small_fill;
242 } else if (LNO > TMAP->lno) {
243 lcnt = vs_sm_nlines(sp, TMAP, LNO, sp->t_maxrows);
244 if (lcnt <= HALFSCREEN(sp))
245 for (; lcnt && sp->t_rows != sp->t_maxrows;
246 --lcnt, ++sp->t_rows) {
247 if (vs_sm_next(sp, TMAP, TMAP + 1))
248 return (1);
249 ++TMAP;
250 if (vs_line(sp, TMAP, NULL, NULL))
251 return (1);
252 }
253 else {
254 small_fill: (void)gp->scr_move(sp, LASTLINE(sp), 0);
255 (void)gp->scr_clrtoeol(sp);
256 for (; sp->t_rows > sp->t_minrows;
257 --sp->t_rows, --TMAP) {
258 (void)gp->scr_move(sp, TMAP - HMAP, 0);
259 (void)gp->scr_clrtoeol(sp);
260 }
261 if (vs_sm_fill(sp, LNO, P_FILL))
262 return (1);
263 F_SET(sp, SC_SCR_REDRAW);
264 goto adjust;
265 }
266 }
267 }
268
269 /*
270 * 6b: Line down, or current screen.
271 */
272 if (LNO >= HMAP->lno) {
273 /* Current screen. */
274 if (LNO <= TMAP->lno)
275 goto adjust;
276 if (F_ISSET(sp, SC_SCR_TOP))
277 goto top;
278 if (F_ISSET(sp, SC_SCR_CENTER))
279 goto middle;
280
281 /*
282 * If less than half a screen above the line, scroll down
283 * until the line is on the screen.
284 */
285 lcnt = vs_sm_nlines(sp, TMAP, LNO, HALFTEXT(sp));
286 if (lcnt < HALFTEXT(sp)) {
287 while (lcnt--)
288 if (vs_sm_1up(sp))
289 return (1);
290 goto adjust;
291 }
292 goto bottom;
293 }
294
295 /*
296 * 6c: If not on the current screen, may request center or top.
297 */
298 if (F_ISSET(sp, SC_SCR_TOP))
299 goto top;
300 if (F_ISSET(sp, SC_SCR_CENTER))
301 goto middle;
302
303 /*
304 * 6d: Line up.
305 */
306 lcnt = vs_sm_nlines(sp, HMAP, LNO, HALFTEXT(sp));
307 if (lcnt < HALFTEXT(sp)) {
308 /*
309 * If less than half a screen below the line, scroll up until
310 * the line is the first line on the screen. Special check so
311 * that if the screen has been emptied, we refill it.
312 */
313 if (db_exist(sp, HMAP->lno)) {
314 while (lcnt--)
315 if (vs_sm_1down(sp))
316 return (1);
317 goto adjust;
318 }
319
320 /*
321 * If less than a half screen from the bottom of the file,
322 * put the last line of the file on the bottom of the screen.
323 */
324 bottom: if (db_last(sp, &lastline))
325 return (1);
326 tmp.lno = LNO;
327 tmp.coff = HMAP->coff;
328 tmp.soff = 1;
329 lcnt = vs_sm_nlines(sp, &tmp, lastline+1, sp->t_rows);
330 if (lcnt < HALFTEXT(sp)) {
331 if (vs_sm_fill(sp, lastline, P_BOTTOM))
332 return (1);
333 F_SET(sp, SC_SCR_REDRAW);
334 goto adjust;
335 }
336 /* It's not close, just put the line in the middle. */
337 goto middle;
338 }
339
340 /*
341 * If less than half a screen from the top of the file, put the first
342 * line of the file at the top of the screen. Otherwise, put the line
343 * in the middle of the screen.
344 */
345 tmp.lno = 1;
346 tmp.coff = HMAP->coff;
347 tmp.soff = 1;
348 lcnt = vs_sm_nlines(sp, &tmp, LNO, HALFTEXT(sp));
349 if (lcnt < HALFTEXT(sp)) {
350 if (vs_sm_fill(sp, 1, P_TOP))
351 return (1);
352 } else
353 middle: if (vs_sm_fill(sp, LNO, P_MIDDLE))
354 return (1);
355 if (0) {
356 top: if (vs_sm_fill(sp, LNO, P_TOP))
357 return (1);
358 }
359 F_SET(sp, SC_SCR_REDRAW);
360
361 /*
362 * At this point we know part of the line is on the screen. Since
363 * scrolling is done using logical lines, not physical, all of the
364 * line may not be on the screen. While that's not necessarily bad,
365 * if the part the cursor is on isn't there, we're going to lose.
366 * This can be tricky; if the line covers the entire screen, lno
367 * may be the same as both ends of the map, that's why we test BOTH
368 * the top and the bottom of the map. This isn't a problem for
369 * left-right scrolling, the cursor movement code handles the problem.
370 *
371 * There's a performance issue here if editing *really* long lines.
372 * This gets to the right spot by scrolling, and, in a binary, by
373 * scrolling hundreds of lines. If the adjustment looks like it's
374 * going to be a serious problem, refill the screen and repaint.
375 */
376 adjust: if (!O_ISSET(sp, O_LEFTRIGHT) &&
377 (LNO == HMAP->lno || LNO == TMAP->lno)) {
378 cnt = vs_screens(sp, LNO, &CNO);
379 if (LNO == HMAP->lno && cnt < HMAP->soff) {
380 if ((HMAP->soff - cnt) > HALFTEXT(sp)) {
381 HMAP->soff = cnt;
382 vs_sm_fill(sp, OOBLNO, P_TOP);
383 F_SET(sp, SC_SCR_REDRAW);
384 } else
385 while (cnt < HMAP->soff)
386 if (vs_sm_1down(sp))
387 return (1);
388 }
389 if (LNO == TMAP->lno && cnt > TMAP->soff) {
390 if ((cnt - TMAP->soff) > HALFTEXT(sp)) {
391 TMAP->soff = cnt;
392 vs_sm_fill(sp, OOBLNO, P_BOTTOM);
393 F_SET(sp, SC_SCR_REDRAW);
394 } else
395 while (cnt > TMAP->soff)
396 if (vs_sm_1up(sp))
397 return (1);
398 }
399 }
400
401 /*
402 * If the screen needs to be repainted, skip cursor optimization.
403 * However, in the code above we skipped leftright scrolling on
404 * the grounds that the cursor code would handle it. Make sure
405 * the right screen is up.
406 */
407 if (F_ISSET(sp, SC_SCR_REDRAW)) {
408 if (O_ISSET(sp, O_LEFTRIGHT))
409 goto slow;
410 goto paint;
411 }
412
413 /*
414 * 7: Cursor movements (current screen only).
415 */
416 if (!LF_ISSET(UPDATE_CURSOR))
417 goto number;
418
419 /*
420 * Decide cursor position. If the line has changed, the cursor has
421 * moved over a tab, or don't know where the cursor was, reparse the
422 * line. Otherwise, we've just moved over fixed-width characters,
423 * and can calculate the left/right scrolling and cursor movement
424 * without reparsing the line. Note that we don't know which (if any)
425 * of the characters between the old and new cursor positions changed.
426 *
427 * XXX
428 * With some work, it should be possible to handle tabs quickly, at
429 * least in obvious situations, like moving right and encountering
430 * a tab, without reparsing the whole line.
431 *
432 * If the line we're working with has changed, reread it..
433 */
434 if (F_ISSET(vip, VIP_CUR_INVALID) || LNO != OLNO)
435 goto slow;
436
437 /* Otherwise, if nothing's changed, ignore the cursor. */
438 if (CNO == OCNO)
439 goto fast;
440
441 /*
442 * Get the current line. If this fails, we either have an empty
443 * file and can just repaint, or there's a real problem. This
444 * isn't a performance issue because there aren't any ways to get
445 * here repeatedly.
446 */
447 if (db_eget(sp, LNO, &p, &len, &isempty)) {
448 if (isempty)
449 goto slow;
450 return (1);
451 }
452
453 #ifdef DEBUG
454 /* Sanity checking. */
455 if (CNO >= len && len != 0) {
456 msgq(sp, M_ERR, "Error: %s/%d: cno (%u) >= len (%u)",
457 tail(__FILE__), __LINE__, CNO, len);
458 return (1);
459 }
460 #endif
461 /*
462 * The basic scheme here is to look at the characters in between
463 * the old and new positions and decide how big they are on the
464 * screen, and therefore, how many screen positions to move.
465 */
466 if (CNO < OCNO) {
467 /*
468 * 7a: Cursor moved left.
469 *
470 * Point to the old character. The old cursor position can
471 * be past EOL if, for example, we just deleted the rest of
472 * the line. In this case, since we don't know the width of
473 * the characters we traversed, we have to do it slowly.
474 */
475 p += OCNO;
476 cnt = (OCNO - CNO) + 1;
477 if (OCNO >= len)
478 goto slow;
479
480 /*
481 * Quick sanity check -- it's hard to figure out exactly when
482 * we cross a screen boundary as we do in the cursor right
483 * movement. If cnt is so large that we're going to cross the
484 * boundary no matter what, stop now.
485 */
486 if (SCNO + 1 + MAX_CHARACTER_COLUMNS < cnt)
487 goto slow;
488
489 /*
490 * Count up the widths of the characters. If it's a tab
491 * character, go do it the the slow way.
492 */
493 for (cwtotal = 0; cnt--; cwtotal += KEY_COL(sp, ch))
494 if ((ch = *(UCHAR_T *)p--) == '\t')
495 goto slow;
496
497 /*
498 * Decrement the screen cursor by the total width of the
499 * characters minus 1.
500 */
501 cwtotal -= 1;
502
503 /*
504 * If we're moving left, and there's a wide character in the
505 * current position, go to the end of the character.
506 */
507 if (KEY_COL(sp, ch) > 1)
508 cwtotal -= KEY_COL(sp, ch) - 1;
509
510 /*
511 * If the new column moved us off of the current logical line,
512 * calculate a new one. If doing leftright scrolling, we've
513 * moved off of the current screen, as well.
514 */
515 if (SCNO < cwtotal)
516 goto slow;
517 SCNO -= cwtotal;
518 } else {
519 /*
520 * 7b: Cursor moved right.
521 *
522 * Point to the first character to the right.
523 */
524 p += OCNO + 1;
525 cnt = CNO - OCNO;
526
527 /*
528 * Count up the widths of the characters. If it's a tab
529 * character, go do it the the slow way. If we cross a
530 * screen boundary, we can quit.
531 */
532 for (cwtotal = SCNO; cnt--;) {
533 if ((ch = *(UCHAR_T *)p++) == '\t')
534 goto slow;
535 if ((cwtotal += KEY_COL(sp, ch)) >= SCREEN_COLS(sp))
536 break;
537 }
538
539 /*
540 * Increment the screen cursor by the total width of the
541 * characters.
542 */
543 SCNO = cwtotal;
544
545 /* See screen change comment in section 6a. */
546 if (SCNO >= SCREEN_COLS(sp))
547 goto slow;
548 }
549
550 /*
551 * 7c: Fast cursor update.
552 *
553 * We have the current column, retrieve the current row.
554 */
555 fast: (void)gp->scr_cursor(sp, &y, ¬used);
556 goto done_cursor;
557
558 /*
559 * 7d: Slow cursor update.
560 *
561 * Walk through the map and find the current line.
562 */
563 slow: for (smp = HMAP; smp->lno != LNO; ++smp);
564
565 /*
566 * 7e: Leftright scrolling adjustment.
567 *
568 * If doing left-right scrolling and the cursor movement has changed
569 * the displayed screen, scroll the screen left or right, unless we're
570 * updating the info line in which case we just scroll that one line.
571 * We adjust the offset up or down until we have a window that covers
572 * the current column, making sure that we adjust differently for the
573 * first screen as compared to subsequent ones.
574 */
575 if (O_ISSET(sp, O_LEFTRIGHT)) {
576 /*
577 * Get the screen column for this character, and correct
578 * for the number option offset.
579 */
580 cnt = vs_columns(sp, NULL, LNO, &CNO, NULL);
581 if (O_ISSET(sp, O_NUMBER))
582 cnt -= O_NUMBER_LENGTH;
583
584 /* Adjust the window towards the beginning of the line. */
585 off = smp->coff;
586 if (off >= cnt) {
587 do {
588 if (off >= O_VAL(sp, O_SIDESCROLL))
589 off -= O_VAL(sp, O_SIDESCROLL);
590 else {
591 off = 0;
592 break;
593 }
594 } while (off >= cnt);
595 goto shifted;
596 }
597
598 /* Adjust the window towards the end of the line. */
599 if ((off == 0 && off + SCREEN_COLS(sp) < cnt) ||
600 (off != 0 && off + sp->cols < cnt)) {
601 do {
602 off += O_VAL(sp, O_SIDESCROLL);
603 } while (off + sp->cols < cnt);
604
605 shifted: /* Fill in screen map with the new offset. */
606 if (F_ISSET(sp, SC_TINPUT_INFO))
607 smp->coff = off;
608 else {
609 for (smp = HMAP; smp <= TMAP; ++smp)
610 smp->coff = off;
611 leftright_warp = 1;
612 }
613 goto paint;
614 }
615
616 /*
617 * We may have jumped here to adjust a leftright screen because
618 * redraw was set. If so, we have to paint the entire screen.
619 */
620 if (F_ISSET(sp, SC_SCR_REDRAW))
621 goto paint;
622 }
623
624 /*
625 * Update the screen lines for this particular file line until we
626 * have a new screen cursor position.
627 */
628 for (y = -1,
629 vip->sc_smap = NULL; smp <= TMAP && smp->lno == LNO; ++smp) {
630 if (vs_line(sp, smp, &y, &SCNO))
631 return (1);
632 if (y != (size_t)-1) {
633 vip->sc_smap = smp;
634 break;
635 }
636 }
637 goto done_cursor;
638
639 /*
640 * 8: Repaint the entire screen.
641 *
642 * Lost big, do what you have to do. We flush the cache, since
643 * SC_SCR_REDRAW gets set when the screen isn't worth fixing, and
644 * it's simpler to repaint. So, don't trust anything that we
645 * think we know about it.
646 */
647 paint: for (smp = HMAP; smp <= TMAP; ++smp)
648 SMAP_FLUSH(smp);
649 for (y = -1, vip->sc_smap = NULL, smp = HMAP; smp <= TMAP; ++smp) {
650 if (vs_line(sp, smp, &y, &SCNO))
651 return (1);
652 if (y != (size_t)-1 && vip->sc_smap == NULL)
653 vip->sc_smap = smp;
654 }
655 /*
656 * If it's a small screen and we're redrawing, clear the unused lines,
657 * ex may have overwritten them.
658 */
659 if (F_ISSET(sp, SC_SCR_REDRAW) && IS_SMALL(sp))
660 for (cnt = sp->t_rows; cnt <= sp->t_maxrows; ++cnt) {
661 (void)gp->scr_move(sp, cnt, 0);
662 (void)gp->scr_clrtoeol(sp);
663 }
664
665 didpaint = 1;
666
667 done_cursor:
668 /*
669 * Sanity checking. When the repainting code messes up, the usual
670 * result is we don't repaint the cursor and so sc_smap will be
671 * NULL. If we're debugging, die, otherwise restart from scratch.
672 */
673 #ifdef DEBUG
674 if (vip->sc_smap == NULL) {
675 fprintf(stderr, "smap error\n");
676 sleep(100);
677 abort();
678 }
679 #else
680 if (vip->sc_smap == NULL) {
681 F_SET(sp, SC_SCR_REFORMAT);
682 return (vs_paint(sp, flags));
683 }
684 #endif
685
686 /*
687 * 9: Set the remembered cursor values.
688 */
689 OCNO = CNO;
690 OLNO = LNO;
691
692 /*
693 * 10: Repaint the line numbers.
694 *
695 * If O_NUMBER is set and the VIP_N_RENUMBER bit is set, and we
696 * didn't repaint the screen, repaint all of the line numbers,
697 * they've changed.
698 */
699 number: if (O_ISSET(sp, O_NUMBER) &&
700 F_ISSET(vip, VIP_N_RENUMBER) && !didpaint && vs_number(sp))
701 return (1);
702
703 /*
704 * 11: Update the mode line, position the cursor, and flush changes.
705 *
706 * If we warped the screen, we have to refresh everything.
707 */
708 if (leftright_warp)
709 LF_SET(UPDATE_CURSOR | UPDATE_SCREEN);
710
711 if (LF_ISSET(UPDATE_SCREEN) && !IS_ONELINE(sp) &&
712 !F_ISSET(vip, VIP_S_MODELINE) && !F_ISSET(sp, SC_TINPUT_INFO))
713 vs_modeline(sp);
714
715 if (LF_ISSET(UPDATE_CURSOR)) {
716 (void)gp->scr_move(sp, y, SCNO);
717
718 /*
719 * XXX
720 * If the screen shifted, we recalculate the "most favorite"
721 * cursor position. Vi won't know that we've warped the
722 * screen, so it's going to have a wrong idea about where the
723 * cursor should be. This is vi's problem, and fixing it here
724 * is a gross layering violation.
725 */
726 if (leftright_warp)
727 (void)vs_column(sp, &sp->rcm);
728 }
729
730 if (LF_ISSET(UPDATE_SCREEN))
731 (void)gp->scr_refresh(sp, F_ISSET(vip, VIP_N_EX_PAINT));
732
733 /* 12: Clear the flags that are handled by this routine. */
734 F_CLR(sp, SC_SCR_CENTER | SC_SCR_REDRAW | SC_SCR_REFORMAT | SC_SCR_TOP);
735 F_CLR(vip, VIP_CUR_INVALID |
736 VIP_N_EX_PAINT | VIP_N_REFRESH | VIP_N_RENUMBER | VIP_S_MODELINE);
737
738 return (0);
739
740 #undef LNO
741 #undef OLNO
742 #undef CNO
743 #undef OCNO
744 #undef SCNO
745 }
746
747 /*
748 * vs_modeline --
749 * Update the mode line.
750 */
751 static void
vs_modeline(SCR * sp)752 vs_modeline(SCR *sp)
753 {
754 static const char * const modes[] = {
755 "215|Append", /* SM_APPEND */
756 "216|Change", /* SM_CHANGE */
757 "217|Command", /* SM_COMMAND */
758 "218|Insert", /* SM_INSERT */
759 "219|Replace", /* SM_REPLACE */
760 };
761 GS *gp;
762 size_t cols, curcol, curlen, endpoint, len, midpoint;
763 const char *t = NULL;
764 int ellipsis;
765 char *p, buf[20];
766
767 gp = sp->gp;
768
769 /*
770 * We put down the file name, the ruler, the mode and the dirty flag.
771 * If there's not enough room, there's not enough room, we don't play
772 * any special games. We try to put the ruler in the middle and the
773 * mode and dirty flag at the end.
774 *
775 * !!!
776 * Leave the last character blank, in case it's a really dumb terminal
777 * with hardware scroll. Second, don't paint the last character in the
778 * screen, SunOS 4.1.1 and Ultrix 4.2 curses won't let you.
779 *
780 * Move to the last line on the screen.
781 */
782 (void)gp->scr_move(sp, LASTLINE(sp), 0);
783
784 /* If more than one screen in the display, show the file name. */
785 curlen = 0;
786 if (IS_SPLIT(sp)) {
787 for (p = sp->frp->name; *p != '\0'; ++p);
788 for (ellipsis = 0, cols = sp->cols / 2; --p > sp->frp->name;) {
789 if (*p == '/') {
790 ++p;
791 break;
792 }
793 if ((curlen += KEY_LEN(sp, *p)) > cols) {
794 ellipsis = 3;
795 curlen +=
796 KEY_LEN(sp, '.') * 3 + KEY_LEN(sp, ' ');
797 while (curlen > cols) {
798 ++p;
799 curlen -= KEY_LEN(sp, *p);
800 }
801 break;
802 }
803 }
804 if (ellipsis) {
805 while (ellipsis--)
806 (void)gp->scr_addstr(sp,
807 (const char *)KEY_NAME(sp, '.'),
808 KEY_LEN(sp, '.'));
809 (void)gp->scr_addstr(sp,
810 (const char *)KEY_NAME(sp, ' '), KEY_LEN(sp, ' '));
811 }
812 for (; *p != '\0'; ++p)
813 (void)gp->scr_addstr(sp,
814 (const char *)KEY_NAME(sp, *p), KEY_LEN(sp, *p));
815 }
816
817 /* Clear the rest of the line. */
818 (void)gp->scr_clrtoeol(sp);
819
820 /*
821 * Display the ruler. If we're not at the midpoint yet, move there.
822 * Otherwise, add in two extra spaces.
823 *
824 * Adjust the current column for the fact that the editor uses it as
825 * a zero-based number.
826 *
827 * XXX
828 * Assume that numbers, commas, and spaces only take up a single
829 * column on the screen.
830 */
831 cols = sp->cols - 1;
832 if (O_ISSET(sp, O_RULER)) {
833 vs_column(sp, &curcol);
834 len =
835 snprintf(buf, sizeof(buf), "%lu,%lu",
836 (unsigned long)sp->lno, (unsigned long)curcol + 1);
837
838 midpoint = (cols - ((len + 1) / 2)) / 2;
839 if (curlen < midpoint) {
840 (void)gp->scr_move(sp, LASTLINE(sp), midpoint);
841 curlen += len;
842 } else if (curlen + 2 + len < cols) {
843 (void)gp->scr_addstr(sp, " ", 2);
844 curlen += 2 + len;
845 }
846 (void)gp->scr_addstr(sp, buf, len);
847 }
848
849 /*
850 * Display the mode and the modified flag, as close to the end of the
851 * line as possible, but guaranteeing at least two spaces between the
852 * ruler and the modified flag.
853 */
854 #define MODESIZE 9
855 endpoint = cols;
856 if (O_ISSET(sp, O_SHOWMODE)) {
857 if (F_ISSET(sp->ep, F_MODIFIED))
858 --endpoint;
859 t = msg_cat(sp, modes[sp->showmode], &len);
860 endpoint -= len;
861 }
862
863 if (endpoint > curlen + 2) {
864 (void)gp->scr_move(sp, LASTLINE(sp), endpoint);
865 if (O_ISSET(sp, O_SHOWMODE)) {
866 if (F_ISSET(sp->ep, F_MODIFIED))
867 (void)gp->scr_addstr(sp,
868 (const char *)KEY_NAME(sp, '*'),
869 KEY_LEN(sp, '*'));
870 (void)gp->scr_addstr(sp, t, len);
871 }
872 }
873 }
874