1 /*-
2 * Copyright (c) 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 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 #ifndef lint
13 static const char sccsid[] = "@(#)vs_split.c 10.31 (Berkeley) 10/13/96";
14 #endif /* not lint */
15
16 #include <sys/types.h>
17 #include <sys/queue.h>
18 #include <sys/time.h>
19
20 #include <bitstring.h>
21 #include <errno.h>
22 #include <limits.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include "../common/common.h"
28 #include "vi.h"
29
30 static SCR *vs_getbg __P((SCR *, char *));
31
32 /*
33 * vs_split --
34 * Create a new screen.
35 *
36 * PUBLIC: int vs_split __P((SCR *, SCR *, int));
37 */
38 int
vs_split(sp,new,ccl)39 vs_split(sp, new, ccl)
40 SCR *sp, *new;
41 int ccl; /* Colon-command line split. */
42 {
43 GS *gp;
44 SMAP *smp;
45 size_t half;
46 int issmallscreen, splitup;
47
48 gp = sp->gp;
49
50 /* Check to see if it's possible. */
51 /* XXX: The IS_ONELINE fix will change this, too. */
52 if (sp->rows < 4) {
53 msgq(sp, M_ERR,
54 "222|Screen must be larger than %d lines to split", 4 - 1);
55 return (1);
56 }
57
58 /* Wait for any messages in the screen. */
59 vs_resolve(sp, NULL, 1);
60
61 half = sp->rows / 2;
62 if (ccl && half > 6)
63 half = 6;
64
65 /* Get a new screen map. */
66 CALLOC(sp, _HMAP(new), SMAP *, SIZE_HMAP(sp), sizeof(SMAP));
67 if (_HMAP(new) == NULL)
68 return (1);
69 _HMAP(new)->lno = sp->lno;
70 _HMAP(new)->coff = 0;
71 _HMAP(new)->soff = 1;
72
73 /*
74 * Small screens: see vs_refresh.c section 6a. Set a flag so
75 * we know to fix the screen up later.
76 */
77 issmallscreen = IS_SMALL(sp);
78
79 /* The columns in the screen don't change. */
80 new->cols = sp->cols;
81
82 /*
83 * Split the screen, and link the screens together. If creating a
84 * screen to edit the colon command line or the cursor is in the top
85 * half of the current screen, the new screen goes under the current
86 * screen. Else, it goes above the current screen.
87 *
88 * Recalculate current cursor position based on sp->lno, we're called
89 * with the cursor on the colon command line. Then split the screen
90 * in half and update the shared information.
91 */
92 splitup =
93 !ccl && (vs_sm_cursor(sp, &smp) ? 0 : (smp - HMAP) + 1) >= half;
94 if (splitup) { /* Old is bottom half. */
95 new->rows = sp->rows - half; /* New. */
96 new->woff = sp->woff;
97 sp->rows = half; /* Old. */
98 sp->woff += new->rows;
99 /* Link in before old. */
100 CIRCLEQ_INSERT_BEFORE(&gp->dq, sp, new, q);
101
102 /*
103 * If the parent is the bottom half of the screen, shift
104 * the map down to match on-screen text.
105 */
106 memmove(_HMAP(sp), _HMAP(sp) + new->rows,
107 (sp->t_maxrows - new->rows) * sizeof(SMAP));
108 } else { /* Old is top half. */
109 new->rows = half; /* New. */
110 sp->rows -= half; /* Old. */
111 new->woff = sp->woff + sp->rows;
112 /* Link in after old. */
113 CIRCLEQ_INSERT_AFTER(&gp->dq, sp, new, q);
114 }
115
116 /* Adjust maximum text count. */
117 sp->t_maxrows = IS_ONELINE(sp) ? 1 : sp->rows - 1;
118 new->t_maxrows = IS_ONELINE(new) ? 1 : new->rows - 1;
119
120 /*
121 * Small screens: see vs_refresh.c, section 6a.
122 *
123 * The child may have different screen options sizes than the parent,
124 * so use them. Guarantee that text counts aren't larger than the
125 * new screen sizes.
126 */
127 if (issmallscreen) {
128 /* Fix the text line count for the parent. */
129 if (splitup)
130 sp->t_rows -= new->rows;
131
132 /* Fix the parent screen. */
133 if (sp->t_rows > sp->t_maxrows)
134 sp->t_rows = sp->t_maxrows;
135 if (sp->t_minrows > sp->t_maxrows)
136 sp->t_minrows = sp->t_maxrows;
137
138 /* Fix the child screen. */
139 new->t_minrows = new->t_rows = O_VAL(sp, O_WINDOW);
140 if (new->t_rows > new->t_maxrows)
141 new->t_rows = new->t_maxrows;
142 if (new->t_minrows > new->t_maxrows)
143 new->t_minrows = new->t_maxrows;
144 } else {
145 sp->t_minrows = sp->t_rows = IS_ONELINE(sp) ? 1 : sp->rows - 1;
146
147 /*
148 * The new screen may be a small screen, even if the parent
149 * was not. Don't complain if O_WINDOW is too large, we're
150 * splitting the screen so the screen is much smaller than
151 * normal.
152 */
153 new->t_minrows = new->t_rows = O_VAL(sp, O_WINDOW);
154 if (new->t_rows > new->rows - 1)
155 new->t_minrows = new->t_rows =
156 IS_ONELINE(new) ? 1 : new->rows - 1;
157 }
158
159 /* Adjust the ends of the new and old maps. */
160 _TMAP(sp) = IS_ONELINE(sp) ?
161 _HMAP(sp) : _HMAP(sp) + (sp->t_rows - 1);
162 _TMAP(new) = IS_ONELINE(new) ?
163 _HMAP(new) : _HMAP(new) + (new->t_rows - 1);
164
165 /* Reset the length of the default scroll. */
166 if ((sp->defscroll = sp->t_maxrows / 2) == 0)
167 sp->defscroll = 1;
168 if ((new->defscroll = new->t_maxrows / 2) == 0)
169 new->defscroll = 1;
170
171 /*
172 * Initialize the screen flags:
173 *
174 * If we're in vi mode in one screen, we don't have to reinitialize.
175 * This isn't just a cosmetic fix. The path goes like this:
176 *
177 * return into vi(), SC_SSWITCH set
178 * call vs_refresh() with SC_STATUS set
179 * call vs_resolve to display the status message
180 * call vs_refresh() because the SC_SCR_VI bit isn't set
181 *
182 * Things go downhill at this point.
183 *
184 * Draw the new screen from scratch, and add a status line.
185 */
186 F_SET(new,
187 SC_SCR_REFORMAT | SC_STATUS |
188 F_ISSET(sp, SC_EX | SC_VI | SC_SCR_VI | SC_SCR_EX));
189 return (0);
190 }
191
192 /*
193 * vs_discard --
194 * Discard the screen, folding the real-estate into a related screen,
195 * if one exists, and return that screen.
196 *
197 * PUBLIC: int vs_discard __P((SCR *, SCR **));
198 */
199 int
vs_discard(sp,spp)200 vs_discard(sp, spp)
201 SCR *sp, **spp;
202 {
203 SCR *nsp;
204 dir_t dir;
205
206 /*
207 * Save the old screen's cursor information.
208 *
209 * XXX
210 * If called after file_end(), and the underlying file was a tmp
211 * file, it may have gone away.
212 */
213 if (sp->frp != NULL) {
214 sp->frp->lno = sp->lno;
215 sp->frp->cno = sp->cno;
216 F_SET(sp->frp, FR_CURSORSET);
217 }
218
219 /*
220 * Add into a previous screen and then into a subsequent screen, as
221 * they're the closest to the current screen. If that doesn't work,
222 * there was no screen to join.
223 */
224 if ((nsp = sp->q.cqe_prev) != (void *)&sp->gp->dq) {
225 nsp->rows += sp->rows;
226 sp = nsp;
227 dir = FORWARD;
228 } else if ((nsp = sp->q.cqe_next) != (void *)&sp->gp->dq) {
229 nsp->woff = sp->woff;
230 nsp->rows += sp->rows;
231 sp = nsp;
232 dir = BACKWARD;
233 } else
234 sp = NULL;
235
236 if (spp != NULL)
237 *spp = sp;
238 if (sp == NULL)
239 return (0);
240
241 /*
242 * Make no effort to clean up the discarded screen's information. If
243 * it's not exiting, we'll do the work when the user redisplays it.
244 *
245 * Small screens: see vs_refresh.c section 6a. Adjust text line info,
246 * unless it's a small screen.
247 *
248 * Reset the length of the default scroll.
249 */
250 if (!IS_SMALL(sp))
251 sp->t_rows = sp->t_minrows = sp->rows - 1;
252 sp->t_maxrows = sp->rows - 1;
253 sp->defscroll = sp->t_maxrows / 2;
254 *(HMAP + (sp->t_rows - 1)) = *TMAP;
255 TMAP = HMAP + (sp->t_rows - 1);
256
257 /*
258 * Draw the new screen from scratch, and add a status line.
259 *
260 * XXX
261 * We could play games with the map, if this were ever to be a
262 * performance problem, but I wrote the code a few times and it
263 * was never clean or easy.
264 */
265 switch (dir) {
266 case FORWARD:
267 vs_sm_fill(sp, OOBLNO, P_TOP);
268 break;
269 case BACKWARD:
270 vs_sm_fill(sp, OOBLNO, P_BOTTOM);
271 break;
272 default:
273 abort();
274 }
275
276 F_SET(sp, SC_STATUS);
277 return (0);
278 }
279
280 /*
281 * vs_fg --
282 * Background the current screen, and foreground a new one.
283 *
284 * PUBLIC: int vs_fg __P((SCR *, SCR **, CHAR_T *, int));
285 */
286 int
vs_fg(sp,nspp,name,newscreen)287 vs_fg(sp, nspp, name, newscreen)
288 SCR *sp, **nspp;
289 CHAR_T *name;
290 int newscreen;
291 {
292 GS *gp;
293 SCR *nsp;
294
295 gp = sp->gp;
296
297 if (newscreen)
298 /* Get the specified background screen. */
299 nsp = vs_getbg(sp, name);
300 else
301 /* Swap screens. */
302 if (vs_swap(sp, &nsp, name))
303 return (1);
304
305 if ((*nspp = nsp) == NULL) {
306 msgq_str(sp, M_ERR, name,
307 name == NULL ?
308 "223|There are no background screens" :
309 "224|There's no background screen editing a file named %s");
310 return (1);
311 }
312
313 if (newscreen) {
314 /* Remove the new screen from the background queue. */
315 CIRCLEQ_REMOVE(&gp->hq, nsp, q);
316
317 /* Split the screen; if we fail, hook the screen back in. */
318 if (vs_split(sp, nsp, 0)) {
319 CIRCLEQ_INSERT_TAIL(&gp->hq, nsp, q);
320 return (1);
321 }
322 } else {
323 /* Move the old screen to the background queue. */
324 CIRCLEQ_REMOVE(&gp->dq, sp, q);
325 CIRCLEQ_INSERT_TAIL(&gp->hq, sp, q);
326 }
327 return (0);
328 }
329
330 /*
331 * vs_bg --
332 * Background the screen, and switch to the next one.
333 *
334 * PUBLIC: int vs_bg __P((SCR *));
335 */
336 int
vs_bg(sp)337 vs_bg(sp)
338 SCR *sp;
339 {
340 GS *gp;
341 SCR *nsp;
342
343 gp = sp->gp;
344
345 /* Try and join with another screen. */
346 if (vs_discard(sp, &nsp))
347 return (1);
348 if (nsp == NULL) {
349 msgq(sp, M_ERR,
350 "225|You may not background your only displayed screen");
351 return (1);
352 }
353
354 /* Move the old screen to the background queue. */
355 CIRCLEQ_REMOVE(&gp->dq, sp, q);
356 CIRCLEQ_INSERT_TAIL(&gp->hq, sp, q);
357
358 /* Toss the screen map. */
359 free(_HMAP(sp));
360 _HMAP(sp) = NULL;
361
362 /* Switch screens. */
363 sp->nextdisp = nsp;
364 F_SET(sp, SC_SSWITCH);
365
366 return (0);
367 }
368
369 /*
370 * vs_swap --
371 * Swap the current screen with a backgrounded one.
372 *
373 * PUBLIC: int vs_swap __P((SCR *, SCR **, char *));
374 */
375 int
vs_swap(sp,nspp,name)376 vs_swap(sp, nspp, name)
377 SCR *sp, **nspp;
378 char *name;
379 {
380 GS *gp;
381 SCR *nsp;
382
383 gp = sp->gp;
384
385 /* Get the specified background screen. */
386 if ((*nspp = nsp = vs_getbg(sp, name)) == NULL)
387 return (0);
388
389 /*
390 * Save the old screen's cursor information.
391 *
392 * XXX
393 * If called after file_end(), and the underlying file was a tmp
394 * file, it may have gone away.
395 */
396 if (sp->frp != NULL) {
397 sp->frp->lno = sp->lno;
398 sp->frp->cno = sp->cno;
399 F_SET(sp->frp, FR_CURSORSET);
400 }
401
402 /* Switch screens. */
403 sp->nextdisp = nsp;
404 F_SET(sp, SC_SSWITCH);
405
406 /* Initialize terminal information. */
407 VIP(nsp)->srows = VIP(sp)->srows;
408
409 /* Initialize screen information. */
410 nsp->cols = sp->cols;
411 nsp->rows = sp->rows; /* XXX: Only place in vi that sets rows. */
412 nsp->woff = sp->woff;
413
414 /*
415 * Small screens: see vs_refresh.c, section 6a.
416 *
417 * The new screens may have different screen options sizes than the
418 * old one, so use them. Make sure that text counts aren't larger
419 * than the new screen sizes.
420 */
421 if (IS_SMALL(nsp)) {
422 nsp->t_minrows = nsp->t_rows = O_VAL(nsp, O_WINDOW);
423 if (nsp->t_rows > sp->t_maxrows)
424 nsp->t_rows = nsp->t_maxrows;
425 if (nsp->t_minrows > sp->t_maxrows)
426 nsp->t_minrows = nsp->t_maxrows;
427 } else
428 nsp->t_rows = nsp->t_maxrows = nsp->t_minrows = nsp->rows - 1;
429
430 /* Reset the length of the default scroll. */
431 nsp->defscroll = nsp->t_maxrows / 2;
432
433 /* Allocate a new screen map. */
434 CALLOC_RET(nsp, _HMAP(nsp), SMAP *, SIZE_HMAP(nsp), sizeof(SMAP));
435 _TMAP(nsp) = _HMAP(nsp) + (nsp->t_rows - 1);
436
437 /* Fill the map. */
438 if (vs_sm_fill(nsp, nsp->lno, P_FILL))
439 return (1);
440
441 /*
442 * The new screen replaces the old screen in the parent/child list.
443 * We insert the new screen after the old one. If we're exiting,
444 * the exit will delete the old one, if we're foregrounding, the fg
445 * code will move the old one to the background queue.
446 */
447 CIRCLEQ_REMOVE(&gp->hq, nsp, q);
448 CIRCLEQ_INSERT_AFTER(&gp->dq, sp, nsp, q);
449
450 /*
451 * Don't change the screen's cursor information other than to
452 * note that the cursor is wrong.
453 */
454 F_SET(VIP(nsp), VIP_CUR_INVALID);
455
456 /* Draw the new screen from scratch, and add a status line. */
457 F_SET(nsp, SC_SCR_REDRAW | SC_STATUS);
458 return (0);
459 }
460
461 /*
462 * vs_resize --
463 * Change the absolute size of the current screen.
464 *
465 * PUBLIC: int vs_resize __P((SCR *, long, adj_t));
466 */
467 int
vs_resize(sp,count,adj)468 vs_resize(sp, count, adj)
469 SCR *sp;
470 long count;
471 adj_t adj;
472 {
473 GS *gp;
474 SCR *g, *s;
475 size_t g_off, s_off;
476
477 gp = sp->gp;
478
479 /*
480 * Figure out which screens will grow, which will shrink, and
481 * make sure it's possible.
482 */
483 if (count == 0)
484 return (0);
485 if (adj == A_SET) {
486 if (sp->t_maxrows == count)
487 return (0);
488 if (sp->t_maxrows > count) {
489 adj = A_DECREASE;
490 count = sp->t_maxrows - count;
491 } else {
492 adj = A_INCREASE;
493 count = count - sp->t_maxrows;
494 }
495 }
496
497 g_off = s_off = 0;
498 if (adj == A_DECREASE) {
499 if (count < 0)
500 count = -count;
501 s = sp;
502 if (s->t_maxrows < MINIMUM_SCREEN_ROWS + count)
503 goto toosmall;
504 if ((g = sp->q.cqe_prev) == (void *)&gp->dq) {
505 if ((g = sp->q.cqe_next) == (void *)&gp->dq)
506 goto toobig;
507 g_off = -count;
508 } else
509 s_off = count;
510 } else {
511 g = sp;
512 if ((s = sp->q.cqe_next) != (void *)&gp->dq)
513 if (s->t_maxrows < MINIMUM_SCREEN_ROWS + count)
514 s = NULL;
515 else
516 s_off = count;
517 else
518 s = NULL;
519 if (s == NULL) {
520 if ((s = sp->q.cqe_prev) == (void *)&gp->dq) {
521 toobig: msgq(sp, M_BERR, adj == A_DECREASE ?
522 "227|The screen cannot shrink" :
523 "228|The screen cannot grow");
524 return (1);
525 }
526 if (s->t_maxrows < MINIMUM_SCREEN_ROWS + count) {
527 toosmall: msgq(sp, M_BERR,
528 "226|The screen can only shrink to %d rows",
529 MINIMUM_SCREEN_ROWS);
530 return (1);
531 }
532 g_off = -count;
533 }
534 }
535
536 /*
537 * Fix up the screens; we could optimize the reformatting of the
538 * screen, but this isn't likely to be a common enough operation
539 * to make it worthwhile.
540 */
541 s->rows += -count;
542 s->woff += s_off;
543 g->rows += count;
544 g->woff += g_off;
545
546 g->t_rows += count;
547 if (g->t_minrows == g->t_maxrows)
548 g->t_minrows += count;
549 g->t_maxrows += count;
550 _TMAP(g) += count;
551 F_SET(g, SC_SCR_REFORMAT | SC_STATUS);
552
553 s->t_rows -= count;
554 s->t_maxrows -= count;
555 if (s->t_minrows > s->t_maxrows)
556 s->t_minrows = s->t_maxrows;
557 _TMAP(s) -= count;
558 F_SET(s, SC_SCR_REFORMAT | SC_STATUS);
559
560 return (0);
561 }
562
563 /*
564 * vs_getbg --
565 * Get the specified background screen, or, if name is NULL, the first
566 * background screen.
567 */
568 static SCR *
vs_getbg(sp,name)569 vs_getbg(sp, name)
570 SCR *sp;
571 char *name;
572 {
573 GS *gp;
574 SCR *nsp;
575 char *p;
576
577 gp = sp->gp;
578
579 /* If name is NULL, return the first background screen on the list. */
580 if (name == NULL) {
581 nsp = gp->hq.cqh_first;
582 return (nsp == (void *)&gp->hq ? NULL : nsp);
583 }
584
585 /* Search for a full match. */
586 for (nsp = gp->hq.cqh_first;
587 nsp != (void *)&gp->hq; nsp = nsp->q.cqe_next)
588 if (!strcmp(nsp->frp->name, name))
589 break;
590 if (nsp != (void *)&gp->hq)
591 return (nsp);
592
593 /* Search for a last-component match. */
594 for (nsp = gp->hq.cqh_first;
595 nsp != (void *)&gp->hq; nsp = nsp->q.cqe_next) {
596 if ((p = strrchr(nsp->frp->name, '/')) == NULL)
597 p = nsp->frp->name;
598 else
599 ++p;
600 if (!strcmp(p, name))
601 break;
602 }
603 if (nsp != (void *)&gp->hq)
604 return (nsp);
605
606 return (NULL);
607 }
608