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.
6 *
7 * See the LICENSE file for redistribution information.
8 */
9
10 #include "config.h"
11
12 #include <sys/types.h>
13 #include <sys/queue.h>
14 #include <sys/time.h>
15
16 #include <bitstring.h>
17 #include <ctype.h>
18 #include <libgen.h>
19 #include <limits.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23
24 #include "../common/common.h"
25 #include "vi.h"
26
27 #define UPDATE_CURSOR 0x01 /* Update the cursor. */
28 #define UPDATE_SCREEN 0x02 /* Flush to screen. */
29
30 static void vs_modeline(SCR *);
31 static int vs_paint(SCR *, u_int);
32
33 /*
34 * v_repaint --
35 * Repaint selected lines from the screen.
36 *
37 * PUBLIC: int vs_repaint(SCR *, EVENT *);
38 */
39 int
vs_repaint(SCR * sp,EVENT * evp)40 vs_repaint(
41 SCR *sp,
42 EVENT *evp)
43 {
44 SMAP *smp;
45
46 for (; evp->e_flno <= evp->e_tlno; ++evp->e_flno) {
47 smp = HMAP + evp->e_flno - 1;
48 SMAP_FLUSH(smp);
49 if (vs_line(sp, smp, NULL, NULL))
50 return (1);
51 }
52 return (0);
53 }
54
55 /*
56 * vs_refresh --
57 * Refresh all screens.
58 *
59 * PUBLIC: int vs_refresh(SCR *, int);
60 */
61 int
vs_refresh(SCR * sp,int forcepaint)62 vs_refresh(
63 SCR *sp,
64 int forcepaint)
65 {
66 GS *gp;
67 SCR *tsp;
68 int need_refresh = 0;
69 u_int priv_paint, pub_paint;
70
71 gp = sp->gp;
72
73 /*
74 * 1: Refresh the screen.
75 *
76 * If SC_SCR_REDRAW is set in the current screen, repaint everything
77 * that we can find, including status lines.
78 */
79 if (F_ISSET(sp, SC_SCR_REDRAW))
80 TAILQ_FOREACH(tsp, gp->dq, q)
81 if (tsp != sp)
82 F_SET(tsp, SC_SCR_REDRAW | SC_STATUS);
83
84 /*
85 * 2: Related or dirtied screens, or screens with messages.
86 *
87 * If related screens share a view into a file, they may have been
88 * modified as well. Refresh any screens that aren't exiting that
89 * have paint or dirty bits set. Always update their screens, we
90 * are not likely to get another chance. Finally, if we refresh any
91 * screens other than the current one, the cursor will be trashed.
92 */
93 pub_paint = SC_SCR_REFORMAT | SC_SCR_REDRAW;
94 priv_paint = VIP_CUR_INVALID | VIP_N_REFRESH;
95 if (O_ISSET(sp, O_NUMBER))
96 priv_paint |= VIP_N_RENUMBER;
97 TAILQ_FOREACH(tsp, gp->dq, q)
98 if (tsp != sp && !F_ISSET(tsp, SC_EXIT | SC_EXIT_FORCE) &&
99 (F_ISSET(tsp, pub_paint) ||
100 F_ISSET(VIP(tsp), priv_paint))) {
101 (void)vs_paint(tsp,
102 (F_ISSET(VIP(tsp), VIP_CUR_INVALID) ?
103 UPDATE_CURSOR : 0) | UPDATE_SCREEN);
104 F_SET(VIP(sp), VIP_CUR_INVALID);
105 }
106
107 /*
108 * 3: Refresh the current screen.
109 *
110 * Always refresh the current screen, it may be a cursor movement.
111 * Also, always do it last -- that way, SC_SCR_REDRAW can be set
112 * in the current screen only, and the screen won't flash.
113 */
114 if (vs_paint(sp, UPDATE_CURSOR | (!forcepaint &&
115 F_ISSET(sp, SC_SCR_VI) && KEYS_WAITING(sp) ? 0 : UPDATE_SCREEN)))
116 return (1);
117
118 /*
119 * 4: Paint any missing status lines.
120 *
121 * XXX
122 * This is fairly evil. Status lines are written using the vi message
123 * mechanism, since we have no idea how long they are. Since we may be
124 * painting screens other than the current one, we don't want to make
125 * the user wait. We depend heavily on there not being any other lines
126 * currently waiting to be displayed and the message truncation code in
127 * the msgq_status routine working.
128 *
129 * And, finally, if we updated any status lines, make sure the cursor
130 * gets back to where it belongs.
131 */
132 TAILQ_FOREACH(tsp, gp->dq, q)
133 if (F_ISSET(tsp, SC_STATUS)) {
134 need_refresh = 1;
135 vs_resolve(tsp, sp, 0);
136 }
137 if (need_refresh)
138 (void)gp->scr_refresh(sp, 0);
139
140 /*
141 * A side-effect of refreshing the screen is that it's now ready
142 * for everything else, i.e. messages.
143 */
144 F_SET(sp, SC_SCR_VI);
145 return (0);
146 }
147
148 /*
149 * vs_paint --
150 * This is the guts of the vi curses screen code. The idea is that
151 * the SCR structure passed in contains the new coordinates of the
152 * screen. What makes this hard is that we don't know how big
153 * characters are, doing input can put the cursor in illegal places,
154 * and we're frantically trying to avoid repainting unless it's
155 * absolutely necessary. If you change this code, you'd better know
156 * what you're doing. It's subtle and quick to anger.
157 */
158 static int
vs_paint(SCR * sp,u_int flags)159 vs_paint(
160 SCR *sp,
161 u_int flags)
162 {
163 GS *gp;
164 SMAP *smp, tmp;
165 VI_PRIVATE *vip;
166 recno_t lastline, lcnt;
167 size_t cwtotal, cnt, len, notused, off, y;
168 int ch = 0, didpaint, isempty, leftright_warp;
169 CHAR_T *p;
170
171 #define LNO sp->lno /* Current file line. */
172 #define OLNO vip->olno /* Remembered file line. */
173 #define CNO sp->cno /* Current file column. */
174 #define OCNO vip->ocno /* Remembered file column. */
175 #define SCNO vip->sc_col /* Current screen column. */
176
177 gp = sp->gp;
178 vip = VIP(sp);
179 didpaint = leftright_warp = 0;
180
181 /*
182 * 5: Reformat the lines.
183 *
184 * If the lines themselves have changed (:set list, for example),
185 * fill in the map from scratch. Adjust the screen that's being
186 * displayed if the leftright flag is set.
187 */
188 if (F_ISSET(sp, SC_SCR_REFORMAT)) {
189 /* Invalidate the line size cache. */
190 VI_SCR_CFLUSH(vip);
191
192 /* Toss vs_line() cached information. */
193 if (F_ISSET(sp, SC_SCR_TOP)) {
194 if (vs_sm_fill(sp, LNO, P_TOP))
195 return (1);
196 }
197 else if (F_ISSET(sp, SC_SCR_CENTER)) {
198 if (vs_sm_fill(sp, LNO, P_MIDDLE))
199 return (1);
200 } else
201 if (vs_sm_fill(sp, OOBLNO, P_TOP))
202 return (1);
203 F_SET(sp, SC_SCR_REDRAW);
204 }
205
206 /*
207 * 6: Line movement.
208 *
209 * Line changes can cause the top line to change as well. As
210 * before, if the movement is large, the screen is repainted.
211 *
212 * 6a: Small screens.
213 *
214 * Users can use the window, w300, w1200 and w9600 options to make
215 * the screen artificially small. The behavior of these options
216 * in the historic vi wasn't all that consistent, and, in fact, it
217 * was never documented how various screen movements affected the
218 * screen size. Generally, one of three things would happen:
219 * 1: The screen would expand in size, showing the line
220 * 2: The screen would scroll, showing the line
221 * 3: The screen would compress to its smallest size and
222 * repaint.
223 * In general, scrolling didn't cause compression (200^D was handled
224 * the same as ^D), movement to a specific line would (:N where N
225 * was 1 line below the screen caused a screen compress), and cursor
226 * movement would scroll if it was 11 lines or less, and compress if
227 * it was more than 11 lines. (And, no, I have no idea where the 11
228 * comes from.)
229 *
230 * What we do is try and figure out if the line is less than half of
231 * a full screen away. If it is, we expand the screen if there's
232 * room, and then scroll as necessary. The alternative is to compress
233 * and repaint.
234 *
235 * !!!
236 * This code is a special case from beginning to end. Unfortunately,
237 * home modems are still slow enough that it's worth having.
238 *
239 * XXX
240 * If the line a really long one, i.e. part of the line is on the
241 * screen but the column offset is not, we'll end up in the adjust
242 * code, when we should probably have compressed the screen.
243 */
244 if (IS_SMALL(sp)) {
245 if (LNO < HMAP->lno) {
246 lcnt = vs_sm_nlines(sp, HMAP, LNO, sp->t_maxrows);
247 if (lcnt <= HALFSCREEN(sp))
248 for (; lcnt && sp->t_rows != sp->t_maxrows;
249 --lcnt, ++sp->t_rows) {
250 ++TMAP;
251 if (vs_sm_1down(sp))
252 return (1);
253 }
254 else
255 goto small_fill;
256 } else if (LNO > TMAP->lno) {
257 lcnt = vs_sm_nlines(sp, TMAP, LNO, sp->t_maxrows);
258 if (lcnt <= HALFSCREEN(sp))
259 for (; lcnt && sp->t_rows != sp->t_maxrows;
260 --lcnt, ++sp->t_rows) {
261 if (vs_sm_next(sp, TMAP, TMAP + 1))
262 return (1);
263 ++TMAP;
264 if (vs_line(sp, TMAP, NULL, NULL))
265 return (1);
266 }
267 else {
268 small_fill: (void)gp->scr_move(sp, LASTLINE(sp), 0);
269 (void)gp->scr_clrtoeol(sp);
270 for (; sp->t_rows > sp->t_minrows;
271 --sp->t_rows, --TMAP) {
272 (void)gp->scr_move(sp, TMAP - HMAP, 0);
273 (void)gp->scr_clrtoeol(sp);
274 }
275 if (vs_sm_fill(sp, LNO, P_FILL))
276 return (1);
277 F_SET(sp, SC_SCR_REDRAW);
278 goto adjust;
279 }
280 }
281 }
282
283 /*
284 * 6b: Line down, or current screen.
285 */
286 if (LNO >= HMAP->lno) {
287 /* Current screen. */
288 if (LNO <= TMAP->lno)
289 goto adjust;
290 if (F_ISSET(sp, SC_SCR_TOP))
291 goto top;
292 if (F_ISSET(sp, SC_SCR_CENTER))
293 goto middle;
294
295 /*
296 * If less than half a screen above the line, scroll down
297 * until the line is on the screen.
298 */
299 lcnt = vs_sm_nlines(sp, TMAP, LNO, HALFTEXT(sp));
300 if (lcnt < HALFTEXT(sp)) {
301 while (lcnt--)
302 if (vs_sm_1up(sp))
303 return (1);
304 goto adjust;
305 }
306 goto bottom;
307 }
308
309 /*
310 * 6c: If not on the current screen, may request center or top.
311 */
312 if (F_ISSET(sp, SC_SCR_TOP))
313 goto top;
314 if (F_ISSET(sp, SC_SCR_CENTER))
315 goto middle;
316
317 /*
318 * 6d: Line up.
319 */
320 lcnt = vs_sm_nlines(sp, HMAP, LNO, HALFTEXT(sp));
321 if (lcnt < HALFTEXT(sp)) {
322 /*
323 * If less than half a screen below the line, scroll up until
324 * the line is the first line on the screen. Special check so
325 * that if the screen has been emptied, we refill it.
326 */
327 if (db_exist(sp, HMAP->lno)) {
328 while (lcnt--)
329 if (vs_sm_1down(sp))
330 return (1);
331 goto adjust;
332 } else
333 goto top; /* XXX No such line. */
334
335 /*
336 * If less than a half screen from the bottom of the file,
337 * put the last line of the file on the bottom of the screen.
338 */
339 bottom: if (db_last(sp, &lastline))
340 return (1);
341 tmp.lno = LNO;
342 tmp.coff = HMAP->coff;
343 tmp.soff = 1;
344 lcnt = vs_sm_nlines(sp, &tmp, lastline, sp->t_rows);
345 if (lcnt < HALFTEXT(sp)) {
346 if (vs_sm_fill(sp, lastline, P_BOTTOM))
347 return (1);
348 F_SET(sp, SC_SCR_REDRAW);
349 goto adjust;
350 }
351 /* It's not close, just put the line in the middle. */
352 goto middle;
353 }
354
355 /*
356 * If less than half a screen from the top of the file, put the first
357 * line of the file at the top of the screen. Otherwise, put the line
358 * in the middle of the screen.
359 */
360 tmp.lno = 1;
361 tmp.coff = HMAP->coff;
362 tmp.soff = 1;
363 lcnt = vs_sm_nlines(sp, &tmp, LNO, HALFTEXT(sp));
364 if (lcnt < HALFTEXT(sp)) {
365 if (vs_sm_fill(sp, 1, P_TOP))
366 return (1);
367 } else
368 middle: if (vs_sm_fill(sp, LNO, P_MIDDLE))
369 return (1);
370 if (0) {
371 top: if (vs_sm_fill(sp, LNO, P_TOP))
372 return (1);
373 }
374 F_SET(sp, SC_SCR_REDRAW);
375
376 /*
377 * At this point we know part of the line is on the screen. Since
378 * scrolling is done using logical lines, not physical, all of the
379 * line may not be on the screen. While that's not necessarily bad,
380 * if the part the cursor is on isn't there, we're going to lose.
381 * This can be tricky; if the line covers the entire screen, lno
382 * may be the same as both ends of the map, that's why we test BOTH
383 * the top and the bottom of the map. This isn't a problem for
384 * left-right scrolling, the cursor movement code handles the problem.
385 *
386 * There's a performance issue here if editing *really* long lines.
387 * This gets to the right spot by scrolling, and, in a binary, by
388 * scrolling hundreds of lines. If the adjustment looks like it's
389 * going to be a serious problem, refill the screen and repaint.
390 */
391 adjust: if (!O_ISSET(sp, O_LEFTRIGHT) &&
392 (LNO == HMAP->lno || LNO == TMAP->lno)) {
393 cnt = vs_screens(sp, LNO, &CNO);
394 if (LNO == HMAP->lno && cnt < HMAP->soff) {
395 if ((HMAP->soff - cnt) > HALFTEXT(sp)) {
396 HMAP->soff = cnt;
397 vs_sm_fill(sp, OOBLNO, P_TOP);
398 F_SET(sp, SC_SCR_REDRAW);
399 } else
400 while (cnt < HMAP->soff)
401 if (vs_sm_1down(sp))
402 return (1);
403 }
404 if (LNO == TMAP->lno && cnt > TMAP->soff) {
405 if ((cnt - TMAP->soff) > HALFTEXT(sp)) {
406 TMAP->soff = cnt;
407 vs_sm_fill(sp, OOBLNO, P_BOTTOM);
408 F_SET(sp, SC_SCR_REDRAW);
409 } else
410 while (cnt > TMAP->soff)
411 if (vs_sm_1up(sp))
412 return (1);
413 }
414 }
415
416 /*
417 * If the screen needs to be repainted, skip cursor optimization.
418 * However, in the code above we skipped leftright scrolling on
419 * the grounds that the cursor code would handle it. Make sure
420 * the right screen is up.
421 */
422 if (F_ISSET(sp, SC_SCR_REDRAW)) {
423 if (O_ISSET(sp, O_LEFTRIGHT))
424 goto slow;
425 goto paint;
426 }
427
428 /*
429 * 7: Cursor movements (current screen only).
430 */
431 if (!LF_ISSET(UPDATE_CURSOR))
432 goto number;
433
434 /*
435 * Decide cursor position. If the line has changed, the cursor has
436 * moved over a tab, or don't know where the cursor was, reparse the
437 * line. Otherwise, we've just moved over fixed-width characters,
438 * and can calculate the left/right scrolling and cursor movement
439 * without reparsing the line. Note that we don't know which (if any)
440 * of the characters between the old and new cursor positions changed.
441 *
442 * XXX
443 * With some work, it should be possible to handle tabs quickly, at
444 * least in obvious situations, like moving right and encountering
445 * a tab, without reparsing the whole line.
446 *
447 * If the line we're working with has changed, reread it..
448 */
449 if (F_ISSET(vip, VIP_CUR_INVALID) || LNO != OLNO)
450 goto slow;
451
452 /* Otherwise, if nothing's changed, ignore the cursor. */
453 if (CNO == OCNO)
454 goto fast;
455
456 /*
457 * Get the current line. If this fails, we either have an empty
458 * file and can just repaint, or there's a real problem. This
459 * isn't a performance issue because there aren't any ways to get
460 * here repeatedly.
461 */
462 if (db_eget(sp, LNO, &p, &len, &isempty)) {
463 if (isempty)
464 goto slow;
465 return (1);
466 }
467
468 #ifdef DEBUG
469 /* Sanity checking. */
470 if (CNO >= len && len != 0) {
471 msgq(sp, M_ERR, "Error: %s/%d: cno (%zu) >= len (%zu)",
472 basename(__FILE__), __LINE__, CNO, len);
473 return (1);
474 }
475 #endif
476 /*
477 * The basic scheme here is to look at the characters in between
478 * the old and new positions and decide how big they are on the
479 * screen, and therefore, how many screen positions to move.
480 */
481 if (CNO < OCNO) {
482 /*
483 * 7a: Cursor moved left.
484 *
485 * Point to the old character. The old cursor position can
486 * be past EOL if, for example, we just deleted the rest of
487 * the line. In this case, since we don't know the width of
488 * the characters we traversed, we have to do it slowly.
489 */
490 p += OCNO;
491 cnt = (OCNO - CNO) + 1;
492 if (OCNO >= len)
493 goto slow;
494
495 /*
496 * Quick sanity check -- it's hard to figure out exactly when
497 * we cross a screen boundary as we do in the cursor right
498 * movement. If cnt is so large that we're going to cross the
499 * boundary no matter what, stop now.
500 */
501 if (SCNO + 1 + MAX_CHARACTER_COLUMNS < cnt)
502 goto slow;
503
504 /*
505 * Count up the widths of the characters. If it's a tab
506 * character, go do it the slow way.
507 */
508 for (cwtotal = 0; cnt--; cwtotal += KEY_COL(sp, ch))
509 if ((ch = *(UCHAR_T *)p--) == '\t')
510 goto slow;
511
512 /*
513 * Decrement the screen cursor by the total width of the
514 * characters minus 1.
515 */
516 cwtotal -= 1;
517
518 /*
519 * If we're moving left, and there's a wide character in the
520 * current position, go to the end of the character.
521 */
522 if (KEY_COL(sp, ch) > 1)
523 cwtotal -= KEY_COL(sp, ch) - 1;
524
525 /*
526 * If the new column moved us off of the current logical line,
527 * calculate a new one. If doing leftright scrolling, we've
528 * moved off of the current screen, as well.
529 */
530 if (SCNO < cwtotal)
531 goto slow;
532 SCNO -= cwtotal;
533 } else {
534 /*
535 * 7b: Cursor moved right.
536 *
537 * Point to the first character to the right.
538 */
539 p += OCNO + 1;
540 cnt = CNO - OCNO;
541
542 /*
543 * Count up the widths of the characters. If it's a tab
544 * character, go do it the slow way. If we cross a
545 * screen boundary, we can quit.
546 */
547 for (cwtotal = SCNO; cnt--;) {
548 if ((ch = *(UCHAR_T *)p++) == '\t')
549 goto slow;
550 if ((cwtotal += KEY_COL(sp, ch)) >= SCREEN_COLS(sp))
551 break;
552 }
553
554 /*
555 * Increment the screen cursor by the total width of the
556 * characters.
557 */
558 SCNO = cwtotal;
559
560 /* See screen change comment in section 6a. */
561 if (SCNO >= SCREEN_COLS(sp))
562 goto slow;
563 }
564
565 /*
566 * 7c: Fast cursor update.
567 *
568 * We have the current column, retrieve the current row.
569 */
570 fast: (void)gp->scr_cursor(sp, &y, ¬used);
571 goto done_cursor;
572
573 /*
574 * 7d: Slow cursor update.
575 *
576 * Walk through the map and find the current line.
577 */
578 slow: for (smp = HMAP; smp->lno != LNO; ++smp);
579
580 /*
581 * 7e: Leftright scrolling adjustment.
582 *
583 * If doing left-right scrolling and the cursor movement has changed
584 * the displayed screen, scroll the screen left or right, unless we're
585 * updating the info line in which case we just scroll that one line.
586 * We adjust the offset up or down until we have a window that covers
587 * the current column, making sure that we adjust differently for the
588 * first screen as compared to subsequent ones.
589 */
590 if (O_ISSET(sp, O_LEFTRIGHT)) {
591 /*
592 * Get the screen column for this character, and correct
593 * for the number option offset.
594 */
595 cnt = vs_columns(sp, NULL, LNO, &CNO, NULL);
596 if (O_ISSET(sp, O_NUMBER))
597 cnt -= O_NUMBER_LENGTH;
598
599 /* Adjust the window towards the beginning of the line. */
600 off = smp->coff;
601 if (off >= cnt) {
602 do {
603 if (off >= O_VAL(sp, O_SIDESCROLL))
604 off -= O_VAL(sp, O_SIDESCROLL);
605 else {
606 off = 0;
607 break;
608 }
609 } while (off >= cnt);
610 goto shifted;
611 }
612
613 /* Adjust the window towards the end of the line. */
614 if ((off == 0 && off + SCREEN_COLS(sp) < cnt) ||
615 (off != 0 && off + sp->cols < cnt)) {
616 do {
617 off += O_VAL(sp, O_SIDESCROLL);
618 } while (off + sp->cols < cnt);
619
620 shifted: /* Fill in screen map with the new offset. */
621 if (F_ISSET(sp, SC_TINPUT_INFO))
622 smp->coff = off;
623 else {
624 for (smp = HMAP; smp <= TMAP; ++smp)
625 smp->coff = off;
626 leftright_warp = 1;
627 }
628 goto paint;
629 }
630
631 /*
632 * We may have jumped here to adjust a leftright screen because
633 * redraw was set. If so, we have to paint the entire screen.
634 */
635 if (F_ISSET(sp, SC_SCR_REDRAW))
636 goto paint;
637 }
638
639 /*
640 * Update the screen lines for this particular file line until we
641 * have a new screen cursor position.
642 */
643 for (y = -1,
644 vip->sc_smap = NULL; smp <= TMAP && smp->lno == LNO; ++smp) {
645 if (vs_line(sp, smp, &y, &SCNO))
646 return (1);
647 if (y != -1) {
648 vip->sc_smap = smp;
649 break;
650 }
651 }
652 goto done_cursor;
653
654 /*
655 * 8: Repaint the entire screen.
656 *
657 * Lost big, do what you have to do. We flush the cache, since
658 * SC_SCR_REDRAW gets set when the screen isn't worth fixing, and
659 * it's simpler to repaint. So, don't trust anything that we
660 * think we know about it.
661 */
662 paint: for (smp = HMAP; smp <= TMAP; ++smp)
663 SMAP_FLUSH(smp);
664 for (y = -1, vip->sc_smap = NULL, smp = HMAP; smp <= TMAP; ++smp) {
665 if (vs_line(sp, smp, &y, &SCNO))
666 return (1);
667 if (y != -1 && vip->sc_smap == NULL)
668 vip->sc_smap = smp;
669 }
670 /*
671 * If it's a small screen and we're redrawing, clear the unused lines,
672 * ex may have overwritten them.
673 */
674 if (F_ISSET(sp, SC_SCR_REDRAW) && IS_SMALL(sp))
675 for (cnt = sp->t_rows; cnt <= sp->t_maxrows; ++cnt) {
676 (void)gp->scr_move(sp, cnt, 0);
677 (void)gp->scr_clrtoeol(sp);
678 }
679
680 didpaint = 1;
681
682 done_cursor:
683 /*
684 * Sanity checking. When the repainting code messes up, the usual
685 * result is we don't repaint the cursor and so sc_smap will be
686 * NULL. If we're debugging, die, otherwise restart from scratch.
687 */
688 #ifdef DEBUG
689 if (vip->sc_smap == NULL)
690 abort();
691 #else
692 if (vip->sc_smap == NULL) {
693 F_SET(sp, SC_SCR_REFORMAT);
694 return (vs_paint(sp, flags));
695 }
696 #endif
697
698 /*
699 * 9: Set the remembered cursor values.
700 */
701 OCNO = CNO;
702 OLNO = LNO;
703
704 /*
705 * 10: Repaint the line numbers.
706 *
707 * If O_NUMBER is set and the VIP_N_RENUMBER bit is set, and we
708 * didn't repaint the screen, repaint all of the line numbers,
709 * they've changed.
710 */
711 number: if (O_ISSET(sp, O_NUMBER) &&
712 F_ISSET(vip, VIP_N_RENUMBER) && !didpaint && vs_number(sp))
713 return (1);
714
715 /*
716 * 11: Update the mode line, position the cursor, and flush changes.
717 *
718 * If we warped the screen, we have to refresh everything.
719 */
720 if (leftright_warp)
721 LF_SET(UPDATE_CURSOR | UPDATE_SCREEN);
722
723 if (LF_ISSET(UPDATE_SCREEN) && !IS_ONELINE(sp) &&
724 !F_ISSET(vip, VIP_S_MODELINE) && !F_ISSET(sp, SC_TINPUT_INFO))
725 vs_modeline(sp);
726
727 if (LF_ISSET(UPDATE_CURSOR)) {
728 (void)gp->scr_move(sp, y, SCNO);
729
730 /*
731 * XXX
732 * If the screen shifted, we recalculate the "most favorite"
733 * cursor position. Vi won't know that we've warped the
734 * screen, so it's going to have a wrong idea about where the
735 * cursor should be. This is vi's problem, and fixing it here
736 * is a gross layering violation.
737 */
738 if (leftright_warp)
739 (void)vs_column(sp, &sp->rcm);
740 }
741
742 if (LF_ISSET(UPDATE_SCREEN))
743 (void)gp->scr_refresh(sp, F_ISSET(vip, VIP_N_EX_PAINT));
744
745 /* 12: Clear the flags that are handled by this routine. */
746 F_CLR(sp, SC_SCR_CENTER | SC_SCR_REDRAW | SC_SCR_REFORMAT | SC_SCR_TOP);
747 F_CLR(vip, VIP_CUR_INVALID |
748 VIP_N_EX_PAINT | VIP_N_REFRESH | VIP_N_RENUMBER | VIP_S_MODELINE);
749
750 return (0);
751
752 #undef LNO
753 #undef OLNO
754 #undef CNO
755 #undef OCNO
756 #undef SCNO
757 }
758
759 /*
760 * vs_modeline --
761 * Update the mode line.
762 */
763 static void
vs_modeline(SCR * sp)764 vs_modeline(SCR *sp)
765 {
766 static char * const modes[] = {
767 "215|Append", /* SM_APPEND */
768 "216|Change", /* SM_CHANGE */
769 "217|Command", /* SM_COMMAND */
770 "218|Insert", /* SM_INSERT */
771 "219|Replace", /* SM_REPLACE */
772 };
773 GS *gp;
774 size_t cols, curcol, curlen, endpoint, len, midpoint;
775 const char *t = NULL;
776 int ellipsis;
777 char buf[20];
778
779 gp = sp->gp;
780
781 /*
782 * We put down the file name, the ruler, the mode and the dirty flag.
783 * If there's not enough room, there's not enough room, we don't play
784 * any special games. We try to put the ruler in the middle and the
785 * mode and dirty flag at the end.
786 *
787 * !!!
788 * Leave the last character blank, in case it's a really dumb terminal
789 * with hardware scroll. Second, don't paint the last character in the
790 * screen, SunOS 4.1.1 and Ultrix 4.2 curses won't let you.
791 *
792 * Move to the last line on the screen.
793 */
794 (void)gp->scr_move(sp, LASTLINE(sp), 0);
795
796 /* If more than one screen in the display, show the file name. */
797 curlen = 0;
798 if (IS_SPLIT(sp)) {
799 CHAR_T *wp, *p;
800 size_t l;
801
802 CHAR2INT(sp, sp->frp->name, strlen(sp->frp->name) + 1, wp, l);
803 p = wp + l;
804 for (ellipsis = 0, cols = sp->cols / 2; --p > wp;) {
805 if (*p == '/') {
806 ++p;
807 break;
808 }
809 if ((curlen += KEY_COL(sp, *p)) > cols) {
810 ellipsis = 3;
811 curlen +=
812 KEY_LEN(sp, '.') * 3 + KEY_LEN(sp, ' ');
813 while (curlen > cols) {
814 ++p;
815 curlen -= KEY_COL(sp, *p);
816 }
817 break;
818 }
819 }
820 if (ellipsis) {
821 while (ellipsis--)
822 (void)gp->scr_addstr(sp,
823 KEY_NAME(sp, '.'), KEY_LEN(sp, '.'));
824 (void)gp->scr_addstr(sp,
825 KEY_NAME(sp, ' '), KEY_LEN(sp, ' '));
826 }
827 for (; *p != '\0'; ++p)
828 (void)gp->scr_addstr(sp,
829 KEY_NAME(sp, *p), KEY_COL(sp, *p));
830 }
831
832 /* Clear the rest of the line. */
833 (void)gp->scr_clrtoeol(sp);
834
835 /*
836 * Display the ruler. If we're not at the midpoint yet, move there.
837 * Otherwise, add in two extra spaces.
838 *
839 * Adjust the current column for the fact that the editor uses it as
840 * a zero-based number.
841 *
842 * XXX
843 * Assume that numbers, commas, and spaces only take up a single
844 * column on the screen.
845 */
846 cols = sp->cols - 1;
847 if (O_ISSET(sp, O_RULER)) {
848 vs_column(sp, &curcol);
849 len = snprintf(buf, sizeof(buf), "%lu,%lu",
850 (u_long)sp->lno, (u_long)(curcol + 1));
851
852 midpoint = (cols - ((len + 1) / 2)) / 2;
853 if (curlen < midpoint) {
854 (void)gp->scr_move(sp, LASTLINE(sp), midpoint);
855 curlen += len;
856 } else if (curlen + 2 + len < cols) {
857 (void)gp->scr_addstr(sp, " ", 2);
858 curlen += 2 + len;
859 }
860 (void)gp->scr_addstr(sp, buf, len);
861 }
862
863 /*
864 * Display the mode and the modified flag, as close to the end of the
865 * line as possible, but guaranteeing at least two spaces between the
866 * ruler and the modified flag.
867 */
868 #define MODESIZE 9
869 endpoint = cols;
870 if (O_ISSET(sp, O_SHOWMODE)) {
871 if (F_ISSET(sp->ep, F_MODIFIED))
872 --endpoint;
873 t = msg_cat(sp, modes[sp->showmode], &len);
874 endpoint -= len;
875 }
876
877 if (endpoint > curlen + 2) {
878 (void)gp->scr_move(sp, LASTLINE(sp), endpoint);
879 if (O_ISSET(sp, O_SHOWMODE)) {
880 if (F_ISSET(sp->ep, F_MODIFIED))
881 (void)gp->scr_addstr(sp,
882 KEY_NAME(sp, '*'), KEY_LEN(sp, '*'));
883 (void)gp->scr_addstr(sp, t, len);
884 }
885 }
886 }
887