-
Notifications
You must be signed in to change notification settings - Fork 18
/
tty_update.c
1738 lines (1526 loc) · 42.4 KB
/
tty_update.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/****************************************************************************
* Copyright (c) 1998 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
****************************************************************************/
/*-----------------------------------------------------------------
*
* lib_doupdate.c
*
* The routine doupdate() and its dependents. Also _nc_outstr(),
* so all physical output is concentrated here (except _nc_outch()
* in lib_tputs.c).
*
*-----------------------------------------------------------------*/
#include <curses.priv.h>
#if defined(TRACE) && HAVE_SYS_TIMES_H && HAVE_TIMES
#define USE_TRACE_TIMES 1
#else
#define USE_TRACE_TIMES 0
#endif
#if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
#include <sys/time.h>
#endif
#if USE_TRACE_TIMES
#include <sys/times.h>
#endif
#if USE_FUNC_POLL
#include <stropts.h>
#include <poll.h>
#elif HAVE_SELECT
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif
#ifdef __BEOS__
/* BeOS select() only works on sockets. Use the tty hack instead */
#include <socket.h>
#define select check_select
#endif
#include <term.h>
MODULE_ID("$Id: tty_update.c,v 1.110 1999/01/31 01:45:37 Alexander.V.Lukyanov Exp $")
/*
* This define controls the line-breakout optimization. Every once in a
* while during screen refresh, we want to check for input and abort the
* update if there's some waiting. CHECK_INTERVAL controls the number of
* changed lines to be emitted between input checks.
*
* Note: Input-check-and-abort is no longer done if the screen is being
* updated from scratch. This is a feature, not a bug.
*/
#define CHECK_INTERVAL 5
/*
* Enable checking to see if doupdate and friends are tracking the true
* cursor position correctly. NOTE: this is a debugging hack which will
* work ONLY on ANSI-compatible terminals!
*/
/* #define POSITION_DEBUG */
static inline chtype ClrBlank ( WINDOW *win );
static int ClrBottom(int total);
static int InsStr( chtype *line, int count );
static void ClearScreen( chtype blank );
static void ClrUpdate( void );
static void DelChar( int count );
static void TransformLine( int const lineno );
#ifdef POSITION_DEBUG
/****************************************************************************
*
* Debugging code. Only works on ANSI-standard terminals.
*
****************************************************************************/
void position_check(int expected_y, int expected_x, char *legend)
/* check to see if the real cursor position matches the virtual */
{
static char buf[9];
int y, x;
if (_nc_tracing)
return;
memset(buf, '\0', sizeof(buf));
(void) write(1, "\033[6n", 4); /* only works on ANSI-compatibles */
(void) read(0, (void *)buf, 8);
_tracef("probe returned %s", _nc_visbuf(buf));
/* try to interpret as a position report */
if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2)
_tracef("position probe failed in %s", legend);
else if (y - 1 != expected_y || x - 1 != expected_x)
_tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s",
y-1, x-1, expected_y, expected_x, legend);
else
_tracef("position matches OK in %s", legend);
}
#endif /* POSITION_DEBUG */
/****************************************************************************
*
* Optimized update code
*
****************************************************************************/
static inline void GoTo(int const row, int const col)
{
chtype oldattr = SP->_current_attr;
TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)",
row, col, SP->_cursrow, SP->_curscol));
#ifdef POSITION_DEBUG
position_check(SP->_cursrow, SP->_curscol, "GoTo");
#endif /* POSITION_DEBUG */
/*
* Force restore even if msgr is on when we're in an alternate
* character set -- these have a strong tendency to screw up the
* CR & LF used for local character motions!
*/
if ((oldattr & A_ALTCHARSET)
|| (oldattr && !move_standout_mode))
{
TR(TRACE_CHARPUT, ("turning off (%#lx) %s before move",
oldattr, _traceattr(oldattr)));
vidattr(A_NORMAL);
}
mvcur(SP->_cursrow, SP->_curscol, row, col);
SP->_cursrow = row;
SP->_curscol = col;
}
static inline void PutAttrChar(chtype ch)
{
if (tilde_glitch && (TextOf(ch) == '~'))
ch = ('`' | AttrOf(ch));
TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)",
_tracechtype(ch),
SP->_cursrow, SP->_curscol));
UpdateAttrs(ch);
putc((int)TextOf(ch), SP->_ofp);
#ifdef TRACE
_nc_outchars++;
#endif /* TRACE */
SP->_curscol++;
if (char_padding) {
TPUTS_TRACE("char_padding");
putp(char_padding);
}
}
static bool check_pending(void)
/* check for pending input */
{
bool have_pending = FALSE;
/*
* Only carry out this check when the flag is zero, otherwise we'll
* have the refreshing slow down drastically (or stop) if there's an
* unread character available.
*/
if(SP->_fifohold != 0)
return FALSE;
if (SP->_checkfd >= 0) {
#if USE_FUNC_POLL
struct pollfd fds[1];
fds[0].fd = SP->_checkfd;
fds[0].events = POLLIN;
if (poll(fds, 1, 0) > 0)
{
have_pending = TRUE;
}
#elif HAVE_SELECT
fd_set fdset;
struct timeval ktimeout;
ktimeout.tv_sec =
ktimeout.tv_usec = 0;
FD_ZERO(&fdset);
FD_SET(SP->_checkfd, &fdset);
if (select(SP->_checkfd+1, &fdset, NULL, NULL, &ktimeout) != 0)
{
have_pending = TRUE;
}
#endif
}
if (have_pending) {
SP->_fifohold = 5;
fflush(SP->_ofp);
}
return FALSE;
}
/*
* No one supports recursive inline functions. However, gcc is quieter if we
* instantiate the recursive part separately.
*/
#if CC_HAS_INLINE_FUNCS
static void callPutChar(chtype const);
#else
#define callPutChar(ch) PutChar(ch)
#endif
static inline void PutChar(chtype const ch); /* forward declaration */
/* put char at lower right corner */
static void PutCharLR(chtype const ch)
{
if (!auto_right_margin)
{
/* we can put the char directly */
PutAttrChar(ch);
}
else if (enter_am_mode && exit_am_mode)
{
/* we can suppress automargin */
TPUTS_TRACE("exit_am_mode");
putp(exit_am_mode);
PutAttrChar(ch);
TPUTS_TRACE("enter_am_mode");
putp(enter_am_mode);
}
else if ((enter_insert_mode && exit_insert_mode)
|| insert_character || parm_ich)
{
GoTo(screen_lines-1,screen_columns-2);
callPutChar(ch);
GoTo(screen_lines-1,screen_columns-2);
InsStr(newscr->_line[screen_lines-1].text+screen_columns-2,1);
}
}
static void wrap_cursor(void)
{
if (eat_newline_glitch)
{
/*
* xenl can manifest two different ways. The vt100
* way is that, when you'd expect the cursor to wrap,
* it stays hung at the right margin (on top of the
* character just emitted) and doesn't wrap until the
* *next* graphic char is emitted. The c100 way is
* to ignore LF received just after an am wrap.
*
* An aggressive way to handle this would be to
* emit CR/LF after the char and then assume the wrap
* is done, you're on the first position of the next
* line, and the terminal out of its weird state.
* Here it's safe to just tell the code that the
* cursor is in hyperspace and let the next mvcur()
* call straighten things out.
*/
SP->_curscol = -1;
SP->_cursrow = -1;
}
else if (auto_right_margin)
{
SP->_curscol = 0;
SP->_cursrow++;
}
else
{
SP->_curscol--;
}
}
static inline void PutChar(chtype const ch)
/* insert character, handling automargin stuff */
{
if (SP->_cursrow == screen_lines-1 && SP->_curscol == screen_columns-1)
PutCharLR(ch);
else
PutAttrChar(ch);
if (SP->_curscol >= screen_columns)
wrap_cursor();
#ifdef POSITION_DEBUG
position_check(SP->_cursrow, SP->_curscol, "PutChar");
#endif /* POSITION_DEBUG */
}
/*
* Issue a given span of characters from an array.
* Must be functionally equivalent to:
* for (i = 0; i < num; i++)
* PutChar(ntext[i]);
* but can leave the cursor positioned at the middle of the interval.
*
* Returns: 0 - cursor is at the end of interval
* 1 - cursor is somewhere in the middle
*
* This code is optimized using ech and rep.
*/
static int EmitRange(const chtype *ntext, int num)
{
int i;
if (erase_chars || repeat_char)
{
while (num > 0)
{
int runcount;
chtype ntext0;
while (num>1 && ntext[0]!=ntext[1])
{
PutChar(ntext[0]);
ntext++;
num--;
}
ntext0 = ntext[0];
if (num==1)
{
PutChar(ntext0);
return 0;
}
runcount = 2;
while (runcount < num && ntext[runcount] == ntext0)
runcount++;
/*
* The cost expression in the middle isn't exactly right.
* _cup_cost is an upper bound on the cost for moving to the
* end of the erased area, but not the cost itself (which we
* can't compute without emitting the move). This may result
* in erase_chars not getting used in some situations for
* which it would be marginally advantageous.
*/
if (erase_chars
&& runcount > SP->_ech_cost + SP->_cup_cost
&& can_clear_with(ntext0))
{
UpdateAttrs(ntext0);
putp(tparm(erase_chars, runcount));
/*
* If this is the last part of the given interval,
* don't bother moving cursor, since it can be the
* last update on the line.
*/
if (runcount < num)
GoTo(SP->_cursrow, SP->_curscol + runcount);
else
return 1; /* cursor stays in the middle */
}
else if (repeat_char && runcount > SP->_rep_cost)
{
bool wrap_possible = (SP->_curscol + runcount >= screen_columns);
int rep_count = runcount;
if (wrap_possible)
rep_count--;
UpdateAttrs(ntext0);
putp(tparm(repeat_char, TextOf(ntext0), rep_count));
SP->_curscol += rep_count;
if (wrap_possible)
PutChar(ntext0);
}
else
{
for (i = 0; i < runcount; i++)
PutChar(ntext[i]);
}
ntext += runcount;
num -= runcount;
}
return 0;
}
for (i = 0; i < num; i++)
PutChar(ntext[i]);
return 0;
}
/*
* Output the line in the given range [first .. last]
*
* If there's a run of identical characters that's long enough to justify
* cursor movement, use that also.
*
* Returns: same as EmitRange
*/
static int PutRange(
const chtype *otext,
const chtype *ntext,
int row,
int first, int last)
{
int j, run;
int cost = min(SP->_cup_ch_cost, SP->_hpa_ch_cost);
TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)",
otext, ntext, row, first, last));
if (otext != ntext
&& (last-first+1) > cost) {
for (j = first, run = 0; j <= last; j++) {
if (otext[j] == ntext[j]) {
run++;
} else {
if (run > cost) {
int before_run = (j - run);
EmitRange(ntext+first, before_run-first);
GoTo(row, first = j);
}
run = 0;
}
}
}
return EmitRange(ntext + first, last-first+1);
}
#if CC_HAS_INLINE_FUNCS
static void callPutChar(chtype const ch)
{
PutChar(ch);
}
#endif
#define MARK_NOCHANGE(win,row) \
{ \
win->_line[row].firstchar = _NOCHANGE; \
win->_line[row].lastchar = _NOCHANGE; \
if_USE_SCROLL_HINTS(win->_line[row].oldindex = row); \
}
int doupdate(void)
{
int i;
int nonempty;
#if USE_TRACE_TIMES
struct tms before, after;
#endif /* USE_TRACE_TIMES */
T((T_CALLED("doupdate()")));
#ifdef TRACE
if (_nc_tracing & TRACE_UPDATE)
{
if (curscr->_clear)
_tracef("curscr is clear");
else
_tracedump("curscr", curscr);
_tracedump("newscr", newscr);
}
#endif /* TRACE */
_nc_signal_handler(FALSE);
if (SP->_fifohold)
SP->_fifohold--;
#if USE_SIZECHANGE
if (SP->_endwin || SP->_sig_winch)
{
/*
* This is a transparent extension: XSI does not address it,
* and applications need not know that ncurses can do it.
*
* Check if the terminal size has changed while curses was off
* (this can happen in an xterm, for example), and resize the
* ncurses data structures accordingly.
*/
_nc_update_screensize();
}
#endif
if (SP->_endwin) {
T(("coming back from shell mode"));
reset_prog_mode();
_nc_mvcur_resume();
_nc_screen_resume();
SP->_mouse_resume(SP);
SP->_endwin = FALSE;
}
#if USE_TRACE_TIMES
/* zero the metering machinery */
_nc_outchars = 0;
(void) times(&before);
#endif /* USE_TRACE_TIMES */
/*
* This is the support for magic-cookie terminals. The
* theory: we scan the virtual screen looking for attribute
* turnons. Where we find one, check to make sure it's
* realizable by seeing if the required number of
* un-attributed blanks are present before and after the
* attributed range; try to shift the range boundaries over
* blanks (not changing the screen display) so this becomes
* true. If it is, shift the beginning attribute change
* appropriately (the end one, if we've gotten this far, is
* guaranteed room for its cookie). If not, nuke the added
* attributes out of the span.
*/
#if USE_XMC_SUPPORT
if (magic_cookie_glitch > 0) {
int j, k;
attr_t rattr = A_NORMAL;
for (i = 0; i < screen_lines; i++)
for (j = 0; j < screen_columns; j++)
{
bool failed = FALSE;
chtype turnon = AttrOf(newscr->_line[i].text[j]) & ~rattr;
/* is an attribute turned on here? */
if (turnon == 0) {
rattr = AttrOf(newscr->_line[i].text[j]);
continue;
}
T(("At (%d, %d): from %s...", i, j, _traceattr(rattr)));
T(("...to %s",_traceattr(turnon)));
/*
* If the attribute change location is a blank with a
* "safe" attribute, undo the attribute turnon. This may
* ensure there's enough room to set the attribute before
* the first non-blank in the run.
*/
#define SAFE(a) !((a) & (chtype)~NONBLANK_ATTR)
if (TextOf(newscr->_line[i].text[j])==' ' && SAFE(turnon))
{
newscr->_line[i].text[j] &= ~turnon;
continue;
}
/* check that there's enough room at start of span */
for (k = 1; k <= magic_cookie_glitch; k++)
if (j-k < 0
|| TextOf(newscr->_line[i].text[j-k]) != ' '
|| !SAFE(AttrOf(newscr->_line[i].text[j-k])))
failed = TRUE;
if (!failed)
{
bool end_onscreen = FALSE;
int m, n = j;
/* find end of span, if it's onscreen */
for (m = i; m < screen_lines; m++)
{
for ( ; n < screen_columns; n++)
{
if (AttrOf(newscr->_line[m].text[n]) == rattr)
{
end_onscreen = TRUE;
T(("Range attributed with %s ends at (%d, %d)",
_traceattr(turnon),m,n));
goto foundit;
}
}
n = 0;
}
T(("Range attributed with %s ends offscreen",
_traceattr(turnon)));
foundit:;
if (end_onscreen)
{
chtype *lastline = newscr->_line[m].text;
/*
* If there are safely-attributed blanks at the
* end of the range, shorten the range. This will
* help ensure that there is enough room at end
* of span.
*/
while (n >= 0
&& TextOf(lastline[n]) == ' '
&& SAFE(AttrOf(lastline[n])))
lastline[n--] &= ~turnon;
/* check that there's enough room at end of span */
for (k = 1; k <= magic_cookie_glitch; k++)
if (n + k >= screen_columns
|| TextOf(lastline[n + k]) != ' '
|| !SAFE(AttrOf(lastline[n+k])))
failed = TRUE;
}
}
if (failed)
{
int p, q = j;
T(("Clearing %s beginning at (%d, %d)",
_traceattr(turnon), i, j));
/* turn off new attributes over span */
for (p = i; p < screen_lines; p++)
{
for ( ; q < screen_columns; q++)
{
if (AttrOf(newscr->_line[p].text[q]) == rattr)
goto foundend;
newscr->_line[p].text[q] &= ~turnon;
}
q = 0;
}
foundend:;
}
else
{
T(("Cookie space for %s found before (%d, %d)",
_traceattr(turnon), i, j));
/*
* back up the start of range so there's room
* for cookies before the first nonblank character
*/
for (k = 1; k <= magic_cookie_glitch; k++)
newscr->_line[i].text[j-k] |= turnon;
}
rattr = AttrOf(newscr->_line[i].text[j]);
}
#ifdef TRACE
/* show altered highlights after magic-cookie check */
if (_nc_tracing & TRACE_UPDATE)
{
_tracef("After magic-cookie check...");
_tracedump("newscr", newscr);
}
#endif /* TRACE */
}
#endif /* USE_XMC_SUPPORT */
nonempty = 0;
if (curscr->_clear || newscr->_clear) { /* force refresh ? */
T(("clearing and updating from scratch"));
ClrUpdate();
curscr->_clear = FALSE; /* reset flag */
newscr->_clear = FALSE; /* reset flag */
} else {
int changedlines = CHECK_INTERVAL;
if(check_pending())
goto cleanup;
nonempty = min(screen_lines, newscr->_maxy+1);
if (SP->_scrolling) {
_nc_scroll_optimize();
}
nonempty = ClrBottom(nonempty);
T(("Transforming lines, nonempty %d", nonempty));
for (i = 0; i < nonempty; i++) {
/*
* Here is our line-breakout optimization.
*/
if (changedlines == CHECK_INTERVAL)
{
if (check_pending())
goto cleanup;
changedlines = 0;
}
/*
* newscr->line[i].firstchar is normally set
* by wnoutrefresh. curscr->line[i].firstchar
* is normally set by _nc_scroll_window in the
* vertical-movement optimization code,
*/
if (newscr->_line[i].firstchar != _NOCHANGE
|| curscr->_line[i].firstchar != _NOCHANGE)
{
TransformLine(i);
changedlines++;
}
/* mark line changed successfully */
if (i <= newscr->_maxy)
MARK_NOCHANGE(newscr,i)
if (i <= curscr->_maxy)
MARK_NOCHANGE(curscr,i)
}
}
/* put everything back in sync */
for (i = nonempty; i <= newscr->_maxy; i++)
MARK_NOCHANGE(newscr,i)
for (i = nonempty; i <= curscr->_maxy; i++)
MARK_NOCHANGE(curscr,i)
if (!newscr->_leaveok)
{
curscr->_curx = newscr->_curx;
curscr->_cury = newscr->_cury;
GoTo(curscr->_cury, curscr->_curx);
}
cleanup:
/*
* Keep the physical screen in normal mode in case we get other
* processes writing to the screen.
*/
UpdateAttrs(A_NORMAL);
fflush(SP->_ofp);
curscr->_attrs = newscr->_attrs;
/* curscr->_bkgd = newscr->_bkgd; */
#if USE_TRACE_TIMES
(void) times(&after);
TR(TRACE_TIMES, ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time",
_nc_outchars,
after.tms_stime-before.tms_stime,
after.tms_utime-before.tms_utime));
#endif /* USE_TRACE_TIMES */
_nc_signal_handler(TRUE);
returnCode(OK);
}
/*
* ClrBlank(win)
*
* Returns the attributed character that corresponds to the "cleared"
* screen. If the terminal has the back-color-erase feature, this will be
* colored according to the wbkgd() call.
*
* We treat 'curscr' specially because it isn't supposed to be set directly
* in the wbkgd() call. Assume 'stdscr' for this case.
*/
#define BCE_ATTRS (A_NORMAL|A_COLOR)
#define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_bkgd)
static inline chtype ClrBlank (WINDOW *win)
{
chtype blank = BLANK;
if (back_color_erase)
blank |= (BCE_BKGD(win) & BCE_ATTRS);
return blank;
}
/*
** ClrUpdate()
**
** Update by clearing and redrawing the entire screen.
**
*/
static void ClrUpdate(void)
{
int i;
chtype blank = ClrBlank(stdscr);
int nonempty = min(screen_lines, newscr->_maxy+1);
T(("ClrUpdate() called"));
ClearScreen(blank);
T(("updating screen from scratch"));
nonempty = ClrBottom(nonempty);
for (i = 0; i < nonempty; i++)
TransformLine(i);
}
/*
** ClrToEOL(blank)
**
** Clear to end of current line, starting at the cursor position
*/
static void ClrToEOL(chtype blank)
{
int j;
bool needclear = FALSE;
for (j = SP->_curscol; j < screen_columns; j++)
{
chtype *cp = &(curscr->_line[SP->_cursrow].text[j]);
if (*cp != blank)
{
*cp = blank;
needclear = TRUE;
}
}
if (needclear)
{
UpdateAttrs(blank);
TPUTS_TRACE("clr_eol");
if (SP->_el_cost > (screen_columns - SP->_curscol))
{
int count = (screen_columns - SP->_curscol);
while (count-- > 0)
PutChar(blank);
}
else
putp(clr_eol);
}
}
/*
** ClrToEOS(blank)
**
** Clear to end of screen, starting at the cursor position
*/
static void ClrToEOS(chtype blank)
{
int row, col;
UpdateAttrs(blank);
TPUTS_TRACE("clr_eos");
row = SP->_cursrow;
tputs(clr_eos, screen_lines-row, _nc_outch);
for (col = SP->_curscol; col < screen_columns; col++)
curscr->_line[row].text[col] = blank;
for (row++; row < screen_lines; row++)
{
for (col = 0; col < screen_columns; col++)
curscr->_line[row].text[col] = blank;
}
}
/*
* ClrBottom(total)
*
* Test if clearing the end of the screen would satisfy part of the
* screen-update. Do this by scanning backwards through the lines in the
* screen, checking if each is blank, and one or more are changed.
*/
static int ClrBottom(int total)
{
static chtype *tstLine;
static size_t lenLine;
int row, col;
int top = total;
int last = min(screen_columns, newscr->_maxx+1);
size_t length = sizeof(chtype) * last;
chtype blank = newscr->_line[total-1].text[last-1]; /* lower right char */
if(!clr_eos || !can_clear_with(blank))
return total;
if (tstLine == 0 || length > lenLine) {
tstLine = (chtype *)_nc_doalloc(tstLine, length);
}
if (tstLine != 0) {
lenLine = length;
for (col = 0; col < last; col++)
tstLine[col] = blank;
for (row = total-1; row >= 0; row--) {
if (memcmp(tstLine, newscr->_line[row].text, length))
break;
if (memcmp(tstLine, curscr->_line[row].text, length))
top = row;
}
/* don't use clr_eos for just one line if clr_eol available */
if (top < total-1 || (top < total && !clr_eol && !clr_bol)) {
GoTo(top,0);
ClrToEOS(blank);
total = top;
if (SP->oldhash && SP->newhash)
{
for (row = top; row < screen_lines; row++)
SP->oldhash[row] = SP->newhash[row];
}
}
}
#if NO_LEAKS
if (tstLine != 0)
FreeAndNull(tstLine);
#endif
return total;
}
/*
** TransformLine(lineno)
**
** Transform the given line in curscr to the one in newscr, using
** Insert/Delete Character if _nc_idcok && has_ic().
**
** firstChar = position of first different character in line
** oLastChar = position of last different character in old line
** nLastChar = position of last different character in new line
**
** move to firstChar
** overwrite chars up to min(oLastChar, nLastChar)
** if oLastChar < nLastChar
** insert newLine[oLastChar+1..nLastChar]
** else
** delete oLastChar - nLastChar spaces
*/
static void TransformLine(int const lineno)
{
int firstChar, oLastChar, nLastChar;
chtype *newLine = newscr->_line[lineno].text;
chtype *oldLine = curscr->_line[lineno].text;
int n;
bool attrchanged = FALSE;
T(("TransformLine(%d) called", lineno));
/* copy new hash value to old one */
if (SP->oldhash && SP->newhash)
SP->oldhash[lineno] = SP->newhash[lineno];
if(ceol_standout_glitch && clr_eol) {
firstChar = 0;
while(firstChar < screen_columns) {
if(AttrOf(newLine[firstChar]) != AttrOf(oldLine[firstChar]))
attrchanged = TRUE;
firstChar++;
}
}
firstChar = 0;
if (attrchanged) { /* we may have to disregard the whole line */
GoTo(lineno, firstChar);
ClrToEOL(ClrBlank(curscr));
PutRange(oldLine, newLine, lineno, 0, (screen_columns-1));
#if USE_XMC_SUPPORT
#define NEW(r,c) newscr->_line[r].text[c]
#define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0)
#define xmc_turn_off(a,b) xmc_turn_on(b,a)
/*
* This is a very simple loop to paint characters which may have the
* magic cookie glitch embedded. It doesn't know much about video
* attributes which are continued from one line to the next. It
* assumes that we have filtered out requests for attribute changes
* that do not get mapped to blank positions.
*
* FIXME: we are not keeping track of where we put the cookies, so this
* will work properly only once, since we may overwrite a cookie in a
* following operation.