1 /*-
2 * Copyright (c) 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 <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <unistd.h>
22
23 #include "../common/common.h"
24 #include "vi.h"
25
26 typedef enum {
27 SCROLL_W, /* User wait. */
28 SCROLL_W_EX, /* User wait, or enter : to continue. */
29 SCROLL_W_QUIT /* User wait, or enter q to quit. */
30 /*
31 * SCROLL_W_QUIT has another semantic
32 * -- only wait if the screen is full
33 */
34 } sw_t;
35
36 static void vs_divider(SCR *);
37 static void vs_msgsave(SCR *, mtype_t, char *, size_t);
38 static void vs_output(SCR *, mtype_t, const char *, int);
39 static void vs_scroll(SCR *, int *, sw_t);
40 static void vs_wait(SCR *, int *, sw_t);
41
42 /*
43 * vs_busy --
44 * Display, update or clear a busy message.
45 *
46 * This routine is the default editor interface for vi busy messages. It
47 * implements a standard strategy of stealing lines from the bottom of the
48 * vi text screen. Screens using an alternate method of displaying busy
49 * messages, e.g. X11 clock icons, should set their scr_busy function to the
50 * correct function before calling the main editor routine.
51 *
52 * PUBLIC: void vs_busy(SCR *, const char *, busy_t);
53 */
54 void
vs_busy(SCR * sp,const char * msg,busy_t btype)55 vs_busy(SCR *sp, const char *msg, busy_t btype)
56 {
57 GS *gp;
58 VI_PRIVATE *vip;
59 static const char flagc[] = "|/-\\";
60 struct timespec ts, ts_diff;
61 const struct timespec ts_min = { 0, 125000000 };
62 size_t len, notused;
63 const char *p;
64
65 /* Ex doesn't display busy messages. */
66 if (F_ISSET(sp, SC_EX | SC_SCR_EXWROTE))
67 return;
68
69 gp = sp->gp;
70 vip = VIP(sp);
71
72 /*
73 * Most of this routine is to deal with the screen sharing real estate
74 * between the normal edit messages and the busy messages. Logically,
75 * all that's needed is something that puts up a message, periodically
76 * updates it, and then goes away.
77 */
78 switch (btype) {
79 case BUSY_ON:
80 ++vip->busy_ref;
81 if (vip->totalcount != 0 || vip->busy_ref != 1)
82 break;
83
84 /* Initialize state for updates. */
85 vip->busy_ch = 0;
86 timepoint_steady(&vip->busy_ts);
87
88 /* Save the current cursor. */
89 (void)gp->scr_cursor(sp, &vip->busy_oldy, &vip->busy_oldx);
90
91 /* Display the busy message. */
92 p = msg_cat(sp, msg, &len);
93 (void)gp->scr_move(sp, LASTLINE(sp), 0);
94 (void)gp->scr_addstr(sp, p, len);
95 (void)gp->scr_cursor(sp, ¬used, &vip->busy_fx);
96 (void)gp->scr_clrtoeol(sp);
97 (void)gp->scr_move(sp, LASTLINE(sp), vip->busy_fx);
98 break;
99 case BUSY_OFF:
100 if (vip->busy_ref == 0)
101 break;
102 --vip->busy_ref;
103
104 /*
105 * If the line isn't in use for another purpose, clear it.
106 * Always return to the original position.
107 */
108 if (vip->totalcount == 0 && vip->busy_ref == 0) {
109 (void)gp->scr_move(sp, LASTLINE(sp), 0);
110 (void)gp->scr_clrtoeol(sp);
111 }
112 (void)gp->scr_move(sp, vip->busy_oldy, vip->busy_oldx);
113 break;
114 case BUSY_UPDATE:
115 if (vip->totalcount != 0 || vip->busy_ref == 0)
116 break;
117
118 /* Update no more than every 1/8 of a second. */
119 timepoint_steady(&ts);
120 ts_diff = ts;
121 timespecsub(&ts_diff, &vip->busy_ts);
122 if (timespeccmp(&ts_diff, &ts_min, <))
123 return;
124 vip->busy_ts = ts;
125
126 /* Display the update. */
127 if (vip->busy_ch == sizeof(flagc) - 1)
128 vip->busy_ch = 0;
129 (void)gp->scr_move(sp, LASTLINE(sp), vip->busy_fx);
130 (void)gp->scr_addstr(sp, flagc + vip->busy_ch++, 1);
131 (void)gp->scr_move(sp, LASTLINE(sp), vip->busy_fx);
132 break;
133 }
134 (void)gp->scr_refresh(sp, 0);
135 }
136
137 /*
138 * vs_home --
139 * Home the cursor to the bottom row, left-most column.
140 *
141 * PUBLIC: void vs_home(SCR *);
142 */
143 void
vs_home(SCR * sp)144 vs_home(SCR *sp)
145 {
146 (void)sp->gp->scr_move(sp, LASTLINE(sp), 0);
147 (void)sp->gp->scr_refresh(sp, 0);
148 }
149
150 /*
151 * vs_update --
152 * Update a command.
153 *
154 * PUBLIC: void vs_update(SCR *, const char *, const CHAR_T *);
155 */
156 void
vs_update(SCR * sp,const char * m1,const CHAR_T * m2)157 vs_update(SCR *sp, const char *m1, const CHAR_T *m2)
158 {
159 GS *gp;
160 size_t len, mlen, oldx, oldy;
161 CONST char *np;
162 size_t nlen;
163
164 gp = sp->gp;
165
166 /*
167 * This routine displays a message on the bottom line of the screen,
168 * without updating any of the command structures that would keep it
169 * there for any period of time, i.e. it is overwritten immediately.
170 *
171 * It's used by the ex read and ! commands when the user's command is
172 * expanded, and by the ex substitution confirmation prompt.
173 */
174 if (F_ISSET(sp, SC_SCR_EXWROTE)) {
175 if (m2 != NULL)
176 INT2CHAR(sp, m2, STRLEN(m2) + 1, np, nlen);
177 (void)ex_printf(sp,
178 "%s\n", m1 == NULL? "" : m1, m2 == NULL ? "" : np);
179 (void)ex_fflush(sp);
180 }
181
182 /*
183 * Save the cursor position, the substitute-with-confirmation code
184 * will have already set it correctly.
185 */
186 (void)gp->scr_cursor(sp, &oldy, &oldx);
187
188 /* Clear the bottom line. */
189 (void)gp->scr_move(sp, LASTLINE(sp), 0);
190 (void)gp->scr_clrtoeol(sp);
191
192 /*
193 * XXX
194 * Don't let long file names screw up the screen.
195 */
196 if (m1 != NULL) {
197 mlen = len = strlen(m1);
198 if (len > sp->cols - 2)
199 mlen = len = sp->cols - 2;
200 (void)gp->scr_addstr(sp, m1, mlen);
201 } else
202 len = 0;
203 if (m2 != NULL) {
204 mlen = STRLEN(m2);
205 if (len + mlen > sp->cols - 2)
206 mlen = (sp->cols - 2) - len;
207 (void)gp->scr_waddstr(sp, m2, mlen);
208 }
209
210 (void)gp->scr_move(sp, oldy, oldx);
211 (void)gp->scr_refresh(sp, 0);
212 }
213
214 /*
215 * vs_msg --
216 * Display ex output or error messages for the screen.
217 *
218 * This routine is the default editor interface for all ex output, and all ex
219 * and vi error/informational messages. It implements the standard strategy
220 * of stealing lines from the bottom of the vi text screen. Screens using an
221 * alternate method of displaying messages, e.g. dialog boxes, should set their
222 * scr_msg function to the correct function before calling the editor.
223 *
224 * PUBLIC: void vs_msg(SCR *, mtype_t, char *, size_t);
225 */
226 void
vs_msg(SCR * sp,mtype_t mtype,char * line,size_t len)227 vs_msg(SCR *sp, mtype_t mtype, char *line, size_t len)
228 {
229 GS *gp;
230 VI_PRIVATE *vip;
231 size_t maxcols, oldx, oldy, padding;
232 const char *e, *s, *t;
233
234 gp = sp->gp;
235 vip = VIP(sp);
236
237 /*
238 * Ring the bell if it's scheduled.
239 *
240 * XXX
241 * Shouldn't we save this, too?
242 */
243 if (F_ISSET(sp, SC_TINPUT_INFO) || F_ISSET(gp, G_BELLSCHED)) {
244 if (F_ISSET(sp, SC_SCR_VI)) {
245 F_CLR(gp, G_BELLSCHED);
246 (void)gp->scr_bell(sp);
247 } else
248 F_SET(gp, G_BELLSCHED);
249 }
250
251 /*
252 * If vi is using the error line for text input, there's no screen
253 * real-estate for the error message. Nothing to do without some
254 * information as to how important the error message is.
255 */
256 if (F_ISSET(sp, SC_TINPUT_INFO))
257 return;
258
259 /*
260 * Ex or ex controlled screen output.
261 *
262 * If output happens during startup, e.g., a .exrc file, we may be
263 * in ex mode but haven't initialized the screen. Initialize here,
264 * and in this case, stay in ex mode.
265 *
266 * If the SC_SCR_EXWROTE bit is set, then we're switching back and
267 * forth between ex and vi, but the screen is trashed and we have
268 * to respect that. Switch to ex mode long enough to put out the
269 * message.
270 *
271 * If the SC_EX_WAIT_NO bit is set, turn it off -- we're writing to
272 * the screen, so previous opinions are ignored.
273 */
274 if (F_ISSET(sp, SC_EX | SC_SCR_EXWROTE)) {
275 if (!F_ISSET(sp, SC_SCR_EX)) {
276 if (F_ISSET(sp, SC_SCR_EXWROTE)) {
277 if (sp->gp->scr_screen(sp, SC_EX))
278 return;
279 } else
280 if (ex_init(sp))
281 return;
282 }
283
284 if (mtype == M_ERR)
285 (void)gp->scr_attr(sp, SA_INVERSE, 1);
286 (void)printf("%.*s", (int)len, line);
287 if (mtype == M_ERR)
288 (void)gp->scr_attr(sp, SA_INVERSE, 0);
289 (void)fflush(stdout);
290
291 F_CLR(sp, SC_EX_WAIT_NO);
292
293 if (!F_ISSET(sp, SC_SCR_EX))
294 (void)sp->gp->scr_screen(sp, SC_VI);
295 return;
296 }
297
298 /* If the vi screen isn't ready, save the message. */
299 if (!F_ISSET(sp, SC_SCR_VI)) {
300 (void)vs_msgsave(sp, mtype, line, len);
301 return;
302 }
303
304 /* Save the cursor position. */
305 (void)gp->scr_cursor(sp, &oldy, &oldx);
306
307 /* If it's an ex output message, just write it out. */
308 if (mtype == M_NONE) {
309 vs_output(sp, mtype, line, len);
310 goto ret;
311 }
312
313 /*
314 * If it's a vi message, strip the trailing <newline> so we can
315 * try and paste messages together.
316 */
317 if (line[len - 1] == '\n')
318 --len;
319
320 /*
321 * If a message won't fit on a single line, try to split on a <blank>.
322 * If a subsequent message fits on the same line, write a separator
323 * and output it. Otherwise, put out a newline.
324 *
325 * Need up to two padding characters normally; a semi-colon and a
326 * separating space. If only a single line on the screen, add some
327 * more for the trailing continuation message.
328 *
329 * XXX
330 * Assume that periods and semi-colons take up a single column on the
331 * screen.
332 *
333 * XXX
334 * There are almost certainly pathological cases that will break this
335 * code.
336 */
337 if (IS_ONELINE(sp))
338 (void)msg_cmsg(sp, CMSG_CONT_S, &padding);
339 else
340 padding = 0;
341 padding += 2;
342
343 maxcols = sp->cols - 1;
344 if (vip->lcontinue != 0) {
345 if (len + vip->lcontinue + padding > maxcols)
346 vs_output(sp, vip->mtype, ".\n", 2);
347 else {
348 vs_output(sp, vip->mtype, ";", 1);
349 vs_output(sp, M_NONE, " ", 1);
350 }
351 }
352 vip->mtype = mtype;
353 for (s = line;; s = t) {
354 for (; len > 0 && isblank((u_char)*s); --len, ++s);
355 if (len == 0)
356 break;
357 if (len + vip->lcontinue > maxcols) {
358 for (e = s + (maxcols - vip->lcontinue);
359 e > s && !isblank((u_char)*e); --e);
360 if (e == s)
361 e = t = s + (maxcols - vip->lcontinue);
362 else
363 for (t = e; isblank((u_char)e[-1]); --e);
364 } else
365 e = t = s + len;
366
367 /*
368 * If the message ends in a period, discard it, we want to
369 * gang messages where possible.
370 */
371 len -= t - s;
372 if (len == 0 && (e - s) > 1 && s[(e - s) - 1] == '.')
373 --e;
374 vs_output(sp, mtype, s, e - s);
375
376 if (len != 0)
377 vs_output(sp, M_NONE, "\n", 1);
378
379 if (INTERRUPTED(sp))
380 break;
381 }
382
383 ret: (void)gp->scr_move(sp, oldy, oldx);
384 (void)gp->scr_refresh(sp, 0);
385 }
386
387 /*
388 * vs_output --
389 * Output the text to the screen.
390 */
391 static void
vs_output(SCR * sp,mtype_t mtype,const char * line,int llen)392 vs_output(SCR *sp, mtype_t mtype, const char *line, int llen)
393 {
394 GS *gp;
395 VI_PRIVATE *vip;
396 size_t notused;
397 int len, rlen, tlen;
398 const char *p, *t;
399 char *cbp, *ecbp, cbuf[128];
400
401 gp = sp->gp;
402 vip = VIP(sp);
403 for (p = line, rlen = llen; llen > 0;) {
404 /* Get the next physical line. */
405 if ((p = memchr(line, '\n', llen)) == NULL)
406 len = llen;
407 else
408 len = p - line;
409
410 /*
411 * The max is sp->cols characters, and we may have already
412 * written part of the line.
413 */
414 if (len + vip->lcontinue > sp->cols)
415 len = sp->cols - vip->lcontinue;
416
417 /*
418 * If the first line output, do nothing. If the second line
419 * output, draw the divider line. If drew a full screen, we
420 * remove the divider line. If it's a continuation line, move
421 * to the continuation point, else, move the screen up.
422 */
423 if (vip->lcontinue == 0) {
424 if (!IS_ONELINE(sp)) {
425 if (vip->totalcount == 1) {
426 (void)gp->scr_move(sp,
427 LASTLINE(sp) - 1, 0);
428 (void)gp->scr_clrtoeol(sp);
429 (void)vs_divider(sp);
430 F_SET(vip, VIP_DIVIDER);
431 ++vip->totalcount;
432 ++vip->linecount;
433 }
434 if (vip->totalcount == sp->t_maxrows &&
435 F_ISSET(vip, VIP_DIVIDER)) {
436 --vip->totalcount;
437 --vip->linecount;
438 F_CLR(vip, VIP_DIVIDER);
439 }
440 }
441 if (vip->totalcount != 0)
442 vs_scroll(sp, NULL, SCROLL_W_QUIT);
443
444 (void)gp->scr_move(sp, LASTLINE(sp), 0);
445 ++vip->totalcount;
446 ++vip->linecount;
447
448 if (INTERRUPTED(sp))
449 break;
450 } else
451 (void)gp->scr_move(sp, LASTLINE(sp), vip->lcontinue);
452
453 /* Error messages are in inverse video. */
454 if (mtype == M_ERR)
455 (void)gp->scr_attr(sp, SA_INVERSE, 1);
456
457 /* Display the line, doing character translation. */
458 #define FLUSH do { \
459 *cbp = '\0'; \
460 (void)gp->scr_addstr(sp, cbuf, cbp - cbuf); \
461 cbp = cbuf; \
462 } while (0)
463 ecbp = (cbp = cbuf) + sizeof(cbuf) - 1;
464 for (t = line, tlen = len; tlen--; ++t) {
465 /*
466 * Replace tabs with spaces, there are places in
467 * ex that do column calculations without looking
468 * at <tabs> -- and all routines that care about
469 * <tabs> do their own expansions. This catches
470 * <tabs> in things like tag search strings.
471 */
472 if (cbp + 1 >= ecbp)
473 FLUSH;
474 *cbp++ = *t == '\t' ? ' ' : *t;
475 }
476 if (cbp > cbuf)
477 FLUSH;
478 if (mtype == M_ERR)
479 (void)gp->scr_attr(sp, SA_INVERSE, 0);
480
481 /* Clear the rest of the line. */
482 (void)gp->scr_clrtoeol(sp);
483
484 /* If we loop, it's a new line. */
485 vip->lcontinue = 0;
486
487 /* Reset for the next line. */
488 line += len;
489 llen -= len;
490 if (p != NULL) {
491 ++line;
492 --llen;
493 }
494 }
495
496 /* Set up next continuation line. */
497 if (p == NULL)
498 gp->scr_cursor(sp, ¬used, &vip->lcontinue);
499 }
500
501 /*
502 * vs_ex_resolve --
503 * Deal with ex message output.
504 *
505 * This routine is called when exiting a colon command to resolve any ex
506 * output that may have occurred.
507 *
508 * PUBLIC: int vs_ex_resolve(SCR *, int *);
509 */
510 int
vs_ex_resolve(SCR * sp,int * continuep)511 vs_ex_resolve(SCR *sp, int *continuep)
512 {
513 EVENT ev;
514 GS *gp;
515 VI_PRIVATE *vip;
516 sw_t wtype;
517
518 gp = sp->gp;
519 vip = VIP(sp);
520 *continuep = 0;
521
522 /* If we ran any ex command, we can't trust the cursor position. */
523 F_SET(vip, VIP_CUR_INVALID);
524
525 /* Terminate any partially written message. */
526 if (vip->lcontinue != 0) {
527 vs_output(sp, vip->mtype, ".", 1);
528 vip->lcontinue = 0;
529
530 vip->mtype = M_NONE;
531 }
532
533 /*
534 * If we switched out of the vi screen into ex, switch back while we
535 * figure out what to do with the screen and potentially get another
536 * command to execute.
537 *
538 * If we didn't switch into ex, we're not required to wait, and less
539 * than 2 lines of output, we can continue without waiting for the
540 * wait.
541 *
542 * Note, all other code paths require waiting, so we leave the report
543 * of modified lines until later, so that we won't wait for no other
544 * reason than a threshold number of lines were modified. This means
545 * we display cumulative line modification reports for groups of ex
546 * commands. That seems right to me (well, at least not wrong).
547 */
548 if (F_ISSET(sp, SC_SCR_EXWROTE)) {
549 if (sp->gp->scr_screen(sp, SC_VI))
550 return (1);
551 } else
552 if (!F_ISSET(sp, SC_EX_WAIT_YES) && vip->totalcount < 2) {
553 F_CLR(sp, SC_EX_WAIT_NO);
554 return (0);
555 }
556
557 /* Clear the required wait flag, it's no longer needed. */
558 F_CLR(sp, SC_EX_WAIT_YES);
559
560 /*
561 * Wait, unless explicitly told not to wait or the user interrupted
562 * the command. If the user is leaving the screen, for any reason,
563 * they can't continue with further ex commands.
564 */
565 if (!F_ISSET(sp, SC_EX_WAIT_NO) && !INTERRUPTED(sp)) {
566 wtype = F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE |
567 SC_FSWITCH | SC_SSWITCH) ? SCROLL_W : SCROLL_W_EX;
568 if (F_ISSET(sp, SC_SCR_EXWROTE))
569 vs_wait(sp, continuep, wtype);
570 else
571 vs_scroll(sp, continuep, wtype);
572 if (*continuep)
573 return (0);
574 }
575
576 /* If ex wrote on the screen, refresh the screen image. */
577 if (F_ISSET(sp, SC_SCR_EXWROTE))
578 F_SET(vip, VIP_N_EX_PAINT);
579
580 /*
581 * If we're not the bottom of the split screen stack, the screen
582 * image itself is wrong, so redraw everything.
583 */
584 if (TAILQ_NEXT(sp, q) != NULL)
585 F_SET(sp, SC_SCR_REDRAW);
586
587 /* If ex changed the underlying file, the map itself is wrong. */
588 if (F_ISSET(vip, VIP_N_EX_REDRAW))
589 F_SET(sp, SC_SCR_REFORMAT);
590
591 /* Ex may have switched out of the alternate screen, return. */
592 (void)gp->scr_attr(sp, SA_ALTERNATE, 1);
593
594 /*
595 * Whew. We're finally back home, after what feels like years.
596 * Kiss the ground.
597 */
598 F_CLR(sp, SC_SCR_EXWROTE | SC_EX_WAIT_NO);
599
600 /*
601 * We may need to repaint some of the screen, e.g.:
602 *
603 * :set
604 * :!ls
605 *
606 * gives us a combination of some lines that are "wrong", and a need
607 * for a full refresh.
608 */
609 if (vip->totalcount > 1) {
610 /* Set up the redraw of the overwritten lines. */
611 ev.e_event = E_REPAINT;
612 ev.e_flno = vip->totalcount >=
613 sp->rows ? 1 : sp->rows - vip->totalcount;
614 ev.e_tlno = sp->rows;
615
616 /* Reset the count of overwriting lines. */
617 vip->linecount = vip->lcontinue = vip->totalcount = 0;
618
619 /* Redraw. */
620 (void)vs_repaint(sp, &ev);
621 } else
622 /* Reset the count of overwriting lines. */
623 vip->linecount = vip->lcontinue = vip->totalcount = 0;
624
625 return (0);
626 }
627
628 /*
629 * vs_resolve --
630 * Deal with message output.
631 *
632 * PUBLIC: int vs_resolve(SCR *, SCR *, int);
633 */
634 int
vs_resolve(SCR * sp,SCR * csp,int forcewait)635 vs_resolve(SCR *sp, SCR *csp, int forcewait)
636 {
637 EVENT ev;
638 GS *gp;
639 MSGS *mp;
640 VI_PRIVATE *vip;
641 size_t oldy, oldx;
642 int redraw;
643
644 /*
645 * Vs_resolve is called from the main vi loop and the refresh function
646 * to periodically ensure that the user has seen any messages that have
647 * been displayed and that any status lines are correct. The sp screen
648 * is the screen we're checking, usually the current screen. When it's
649 * not, csp is the current screen, used for final cursor positioning.
650 */
651 gp = sp->gp;
652 vip = VIP(sp);
653 if (csp == NULL)
654 csp = sp;
655
656 /* Save the cursor position. */
657 (void)gp->scr_cursor(csp, &oldy, &oldx);
658
659 /* Ring the bell if it's scheduled. */
660 if (F_ISSET(gp, G_BELLSCHED)) {
661 F_CLR(gp, G_BELLSCHED);
662 (void)gp->scr_bell(sp);
663 }
664
665 /* Display new file status line. */
666 if (F_ISSET(sp, SC_STATUS)) {
667 F_CLR(sp, SC_STATUS);
668 msgq_status(sp, sp->lno, MSTAT_TRUNCATE);
669 }
670
671 /* Report on line modifications. */
672 mod_rpt(sp);
673
674 /*
675 * Flush any saved messages. If the screen isn't ready, refresh
676 * it. (A side-effect of screen refresh is that we can display
677 * messages.) Once this is done, don't trust the cursor. That
678 * extra refresh screwed the pooch.
679 */
680 if (!SLIST_EMPTY(gp->msgq)) {
681 if (!F_ISSET(sp, SC_SCR_VI) && vs_refresh(sp, 1))
682 return (1);
683 while ((mp = SLIST_FIRST(gp->msgq)) != NULL) {
684 gp->scr_msg(sp, mp->mtype, mp->buf, mp->len);
685 SLIST_REMOVE_HEAD(gp->msgq, q);
686 free(mp->buf);
687 free(mp);
688 }
689 F_SET(vip, VIP_CUR_INVALID);
690 }
691
692 switch (vip->totalcount) {
693 case 0:
694 redraw = 0;
695 break;
696 case 1:
697 /*
698 * If we're switching screens, we have to wait for messages,
699 * regardless. If we don't wait, skip updating the modeline.
700 */
701 if (forcewait)
702 vs_scroll(sp, NULL, SCROLL_W);
703 else
704 F_SET(vip, VIP_S_MODELINE);
705
706 redraw = 0;
707 break;
708 default:
709 /*
710 * If >1 message line in use, prompt the user to continue and
711 * repaint overwritten lines.
712 */
713 vs_scroll(sp, NULL, SCROLL_W);
714
715 ev.e_event = E_REPAINT;
716 ev.e_flno = vip->totalcount >=
717 sp->rows ? 1 : sp->rows - vip->totalcount;
718 ev.e_tlno = sp->rows;
719
720 redraw = 1;
721 break;
722 }
723
724 /* Reset the count of overwriting lines. */
725 vip->linecount = vip->lcontinue = vip->totalcount = 0;
726
727 /* Redraw. */
728 if (redraw)
729 (void)vs_repaint(sp, &ev);
730
731 /* Restore the cursor position. */
732 (void)gp->scr_move(csp, oldy, oldx);
733
734 return (0);
735 }
736
737 /*
738 * vs_scroll --
739 * Scroll the screen for output.
740 */
741 static void
vs_scroll(SCR * sp,int * continuep,sw_t wtype)742 vs_scroll(SCR *sp, int *continuep, sw_t wtype)
743 {
744 GS *gp;
745 VI_PRIVATE *vip;
746
747 gp = sp->gp;
748 vip = VIP(sp);
749 if (!IS_ONELINE(sp)) {
750 /*
751 * Scroll the screen. Instead of scrolling the entire screen,
752 * delete the line above the first line output so preserve the
753 * maximum amount of the screen.
754 */
755 (void)gp->scr_move(sp, vip->totalcount <
756 sp->rows ? LASTLINE(sp) - vip->totalcount : 0, 0);
757 (void)gp->scr_deleteln(sp);
758
759 /* If there are screens below us, push them back into place. */
760 if (TAILQ_NEXT(sp, q) != NULL) {
761 (void)gp->scr_move(sp, LASTLINE(sp), 0);
762 (void)gp->scr_insertln(sp);
763 }
764 }
765 if (wtype == SCROLL_W_QUIT && vip->linecount < sp->t_maxrows)
766 return;
767 vs_wait(sp, continuep, wtype);
768 }
769
770 /*
771 * vs_wait --
772 * Prompt the user to continue.
773 */
774 static void
vs_wait(SCR * sp,int * continuep,sw_t wtype)775 vs_wait(SCR *sp, int *continuep, sw_t wtype)
776 {
777 EVENT ev;
778 VI_PRIVATE *vip;
779 const char *p;
780 GS *gp;
781 size_t len;
782
783 gp = sp->gp;
784 vip = VIP(sp);
785
786 (void)gp->scr_move(sp, LASTLINE(sp), 0);
787 if (IS_ONELINE(sp))
788 p = msg_cmsg(sp, CMSG_CONT_S, &len);
789 else
790 switch (wtype) {
791 case SCROLL_W_QUIT:
792 p = msg_cmsg(sp, CMSG_CONT_Q, &len);
793 break;
794 case SCROLL_W_EX:
795 p = msg_cmsg(sp, CMSG_CONT_EX, &len);
796 break;
797 case SCROLL_W:
798 p = msg_cmsg(sp, CMSG_CONT, &len);
799 break;
800 default:
801 abort();
802 /* NOTREACHED */
803 }
804 (void)gp->scr_addstr(sp, p, len);
805
806 ++vip->totalcount;
807 vip->linecount = 0;
808
809 (void)gp->scr_clrtoeol(sp);
810 (void)gp->scr_refresh(sp, 0);
811
812 /* Get a single character from the terminal. */
813 if (continuep != NULL)
814 *continuep = 0;
815 for (;;) {
816 if (v_event_get(sp, &ev, 0, 0))
817 return;
818 if (ev.e_event == E_CHARACTER)
819 break;
820 if (ev.e_event == E_INTERRUPT) {
821 ev.e_c = CH_QUIT;
822 F_SET(gp, G_INTERRUPTED);
823 break;
824 }
825 (void)gp->scr_bell(sp);
826 }
827 switch (wtype) {
828 case SCROLL_W_QUIT:
829 if (ev.e_c == CH_QUIT)
830 F_SET(gp, G_INTERRUPTED);
831 break;
832 case SCROLL_W_EX:
833 if (ev.e_c == ':' && continuep != NULL)
834 *continuep = 1;
835 break;
836 case SCROLL_W:
837 break;
838 }
839 }
840
841 /*
842 * vs_divider --
843 * Draw a dividing line between the screen and the output.
844 */
845 static void
vs_divider(SCR * sp)846 vs_divider(SCR *sp)
847 {
848 GS *gp;
849 size_t len;
850
851 #define DIVIDESTR "+=+=+=+=+=+=+=+"
852 len =
853 sizeof(DIVIDESTR) - 1 > sp->cols ? sp->cols : sizeof(DIVIDESTR) - 1;
854 gp = sp->gp;
855 (void)gp->scr_attr(sp, SA_INVERSE, 1);
856 (void)gp->scr_addstr(sp, DIVIDESTR, len);
857 (void)gp->scr_attr(sp, SA_INVERSE, 0);
858 }
859
860 /*
861 * vs_msgsave --
862 * Save a message for later display.
863 */
864 static void
vs_msgsave(SCR * sp,mtype_t mt,char * p,size_t len)865 vs_msgsave(SCR *sp, mtype_t mt, char *p, size_t len)
866 {
867 GS *gp;
868 MSGS *mp_c, *mp_n;
869
870 /*
871 * We have to handle messages before we have any place to put them.
872 * If there's no screen support yet, allocate a msg structure, copy
873 * in the message, and queue it on the global structure. If we can't
874 * allocate memory here, we're genuinely screwed, dump the message
875 * to stderr in the (probably) vain hope that someone will see it.
876 */
877 CALLOC_GOTO(sp, mp_n, 1, sizeof(MSGS));
878 MALLOC_GOTO(sp, mp_n->buf, len);
879
880 memmove(mp_n->buf, p, len);
881 mp_n->len = len;
882 mp_n->mtype = mt;
883
884 gp = sp->gp;
885 if (SLIST_EMPTY(gp->msgq)) {
886 SLIST_INSERT_HEAD(gp->msgq, mp_n, q);
887 } else {
888 SLIST_FOREACH(mp_c, gp->msgq, q)
889 if (SLIST_NEXT(mp_c, q) == NULL)
890 break;
891 SLIST_INSERT_AFTER(mp_c, mp_n, q);
892 }
893 return;
894
895 alloc_err:
896 free(mp_n);
897 (void)fprintf(stderr, "%.*s\n", (int)len, p);
898 }
899