-
Notifications
You must be signed in to change notification settings - Fork 7
/
display.c
1386 lines (1151 loc) · 31.8 KB
/
display.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
/* display.c -- implements display.h */
#include "display.h"
/* The functions in this file handle redisplay. There are two halves, the
ones that update the virtual display screen, and the ones that make the
physical display screen the same as the virtual display screen. These
functions use hints that are left in the windows by the commands.
Modified by Petri Kutvonen
*/
#include <assert.h>
#include <errno.h>
#include <locale.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "buffer.h"
#include "defines.h"
#include "input.h"
#include "line.h"
#include "termio.h"
#include "terminal.h"
#include "version.h"
#include "utf8.h"
#include "window.h"
typedef struct {
int v_flag ; /* Flags */
#if COLOR
int v_fcolor ; /* current foreground color */
int v_bcolor ; /* current background color */
int v_rfcolor ; /* requested foreground color */
int v_rbcolor ; /* requested background color */
#endif
unicode_t v_text[] ; /* Screen data. */
} *video_p ;
#define VFCHG 0x0001 /* Changed flag */
#define VFEXT 0x0002 /* extended (beyond column 80) */
#define VFREV 0x0004 /* reverse video status */
#define VFREQ 0x0008 /* reverse video request */
#define VFCOL 0x0010 /* color change requested */
static video_p *vscreen ; /* Virtual screen. */
static video_p *pscreen ; /* Physical screen. */
#ifdef SIGWINCH
# include <sys/ioctl.h>
/* for window size changes */
int chg_width, chg_height ;
static int displaying = TRUE ;
static void sizesignal( int signr) ;
#endif
static int currow ; /* Cursor row */
static int curcol ; /* Cursor column */
static int vtrow = 0 ; /* Row location of SW cursor */
static int vtcol = 0 ; /* Column location of SW cursor */
static int lbound = 0 ; /* leftmost column of current line being displayed */
int mpresf = FALSE ; /* TRUE if message in last line */
int scrollcount = 1 ; /* number of lines to scroll */
int discmd = TRUE ; /* display command flag */
int disinp = TRUE ; /* display input characters (echo) */
/* global variables */
boolean viewtab = FALSE ; /* $viewtab = TRUE to visualize hardcoded tab */
static int reframe( window_p wp) ;
static void updone( window_p wp) ;
static void updall( window_p wp) ;
static int scrolls( int inserts) ;
static void scrscroll( int from, int to, int count) ;
static int texttest( int vrow, int prow) ;
static int endofline( unicode_t *s, int n) ;
static void upddex( void) ;
static void updext( void) ;
static void updgar( void) ;
static void updpos( void) ;
static void updateline( int row) ;
static void updupd( boolean force_f) ;
static void modeline( window_p wp) ;
static void mlputi( int i, int r) ;
static void mlputli( long l, int r) ;
static void mlputf( int s) ;
static void mlputs( const char *s) ;
#if SIGWINCH
static void newscreensize( int h, int w) ;
#endif
/* xmalloc is used at early initialization before memory usage tracking is
enabled so it bypass the memory tracking macroes.
*/
static void *xmalloc( size_t size) {
void *ret = (malloc)( size) ;
if( !ret) {
fprintf( stderr, "fatal: Out of memory\n") ;
exit( EXIT_FAILURE) ;
}
return ret ;
}
/* Initialize the data structures used by the display code. The edge
vectors used to access the screens are set up. The operating system's
terminal I/O channel is set up. All the other things get initialized at
compile time. The original window has "WFCHG" set, so that it will get
completely redrawn on the first call to "update".
*/
static int lastmrow ; /* remember mrow for later free */
static void vtalloc( int maxrow, int maxcol) {
lastmrow = maxrow ; /* remember mrow for later free */
vscreen = xmalloc( maxrow * sizeof( video_p )) ;
pscreen = xmalloc( maxrow * sizeof( video_p )) ;
for( int i = 0 ; i < maxrow ; ++i) {
video_p vp = xmalloc( sizeof *vp + maxcol * sizeof( unicode_t)) ;
vp->v_flag = 0 ;
#if COLOR
vp->v_rfcolor = 7 ;
vp->v_rbcolor = 0 ;
#endif
vscreen[ i] = vp ;
vp = xmalloc( sizeof *vp + maxcol * sizeof( unicode_t)) ;
vp->v_flag = 0 ;
pscreen[ i] = vp ;
}
}
void updmargin( void) {
#define MINMARGIN 3 /* MINMARGIN - 1 enough for $ + prev before current */
#if MINCOLS < 2 * MINMARGIN + 1
# error "MINCOLS and MINMARGIN are not consistent"
#endif
term.t_margin = term.t_ncol / 10 ;
if( term.t_margin < MINMARGIN)
term.t_margin = MINMARGIN ;
term.t_scrsiz = term.t_ncol - 2 * term.t_margin ;
}
void vtinit( void) {
#ifdef SIGWINCH
signal( SIGWINCH, sizesignal) ;
#endif
setlocale( LC_CTYPE, "") ; /* expects $LANG like en_GB.UTF-8 */
TTopen() ; /* open the screen */
updmargin() ;
TTkopen() ; /* open the keyboard */
TTrev( FALSE) ;
vtalloc( term.t_mrow, term.t_mcol) ;
}
/* free up all the dynamically video structures allocated by vtalloc */
void vtfree( void) {
/* as xmalloc bypass the malloc macro, we need bypass the free macro too */
for( int i = 0 ; i < lastmrow ; ++i ) {
(free)( vscreen[ i]) ;
(free)( pscreen[ i]) ;
}
(free)( vscreen) ;
(free)( pscreen) ;
}
/* Clean up the virtual terminal system, in anticipation for a return to
the operating system. Move down to the last line and clear it out (the
next system prompt will be written in the line). Shut down the channel
to the terminal.
*/
void vttidy( void) {
mlerase() ; /* ends with movecursor( term.t_nrow, 0) and TTflush() */
TTclose() ;
TTkclose() ;
#ifdef PKCODE
int ret = write( 1, "\r", 1) ;
if( ret != 1) {
/* some error handling here */
}
#endif
}
/* Set the virtual cursor to the specified row and column on the virtual
screen. There is no checking for nonsense values; this might be a good
idea during the early stages.
*/
static void vtmove( int row, int col) {
vtrow = row ;
vtcol = col ;
}
/* Write a character to the virtual screen. The virtual row and column are
updated. If we are not yet on left edge, don't print it yet. If the
line is too long put a "$" in the last column.
This routine only puts printing characters into the virtual terminal
buffers. Only column overflow is checked.
*/
static void sane_vtputc( unicode_t c) {
/* intended to be called by vtputc once sanity check has been done
** only normal printable char should be passed as parameter */
unicode_t *vcp = vscreen[ vtrow]->v_text ; /* ptr to line being updated */
if( vtcol >= term.t_ncol)
vcp[ term.t_ncol - 1] = '$' ;
else if( vtcol >= 0)
vcp[ vtcol] = c ;
vtcol += 1 ;
}
static void vtputuc( unicode_t c) {
/* In case somebody passes us a signed char.. */
// if( c > 0x10FFFF) /* Let's assume this is due to sign extension */
// c &= 0xFF ;
assert( c <= 0x10FFFF) ;
if( c == '\t') {
sane_vtputc( viewtab ? 0xBB : ' ') ; /* 0xBB: '»' */
while( ((vtcol + lbound) % tabwidth) != 0)
sane_vtputc( ' ') ;
} else if( c < 0x20 || c == 0x7F) {
sane_vtputc( '^') ;
sane_vtputc( c ^ 0x40) ;
} else if( c >= 0x80 && c < 0xA0) {
static const char hex[] = "0123456789abcdef" ;
sane_vtputc( '\\') ;
sane_vtputc( hex[ c >> 4]) ;
sane_vtputc( hex[ c & 15]) ;
} else if( _utf8_width( c) < 0) {
sane_vtputc( '\\') ; /* show as non printable */
sane_vtputc( 'u') ;
} else
sane_vtputc( c) ;
}
static int vtputs( const char *s) {
int n = 0 ;
while( *s) {
unicode_t c ;
s += utf8_to_unicode( s, 0, 4, &c) ;
vtputuc( c) ;
n += utf8_width( c) ;
}
return n ;
}
/* Erase from the end of the software cursor to the end of the line on which
* the software cursor is located.
*/
static void vteeol( void) {
unicode_t *vcp = vscreen[ vtrow]->v_text ;
while( vtcol < term.t_ncol)
vcp[ vtcol++] = ' ' ;
}
/* upscreen():
* user routine to force a screen update
* always finishes complete update
*/
TBINDABLE( upscreen) {
update( TRUE) ;
return TRUE ;
}
#if SCROLLCODE
static int scrflags ;
#endif
/* Make sure that the display is right. This is a three part process.
First, scan through all of the windows looking for dirty ones. Check
the framing, and refresh the screen. Second, make sure that "currow"
and "curcol" are correct for the current window. Third, make the
virtual and physical screens the same.
boolean force_f ; force update past type ahead?
*/
void update( boolean force_f) {
window_p wp ;
#if TYPEAH && ! PKCODE
if( force_f == FALSE && typahead())
return ;
#endif
#if VISMAC == 0
if( force_f == FALSE && kbdmode == PLAY)
return ;
#endif
#if SIGWINCH
displaying = TRUE ;
resize:
#endif
#if SCROLLCODE
/* first, propagate mode line changes to all instances of a buffer displayed
* in more than one window */
for( wp = wheadp ; wp != NULL ; wp = wp->w_wndp)
if( wp->w_flag & WFMODE
&& wp->w_bufp->b_nwnd > 1)
/* make sure all previous windows have this */
for( window_p owp = wheadp ; owp != NULL ; owp = owp->w_wndp)
if( owp->w_bufp == wp->w_bufp)
owp->w_flag |= WFMODE ;
#endif
/* update any windows that need refreshing */
for( wp = wheadp ; wp != NULL ; wp = wp->w_wndp)
if( wp->w_flag) {
/* if the window has changed, service it */
reframe( wp) ; /* check the framing */
#if SCROLLCODE
if( wp->w_flag & (WFKILLS | WFINS)) {
scrflags |= wp->w_flag & (WFINS | WFKILLS) ;
wp->w_flag &= ~(WFKILLS | WFINS) ;
}
#endif
if( (wp->w_flag & ~WFMODE) == WFEDIT)
updone( wp) ; /* update EDITed line */
else if( wp->w_flag & ~WFMOVE)
updall( wp) ; /* update all lines */
#if SCROLLCODE
if( scrflags || (wp->w_flag & WFMODE))
#else
if( wp->w_flag & WFMODE)
#endif
modeline( wp) ; /* update modeline */
wp->w_flag = 0 ;
wp->w_force = 0 ;
}
/* recalc the current hardware cursor location */
updpos() ;
/* check for lines to de-extend */
upddex() ;
/* if screen is garbage, re-plot it */
if( sgarbf != FALSE)
updgar() ;
/* update the virtual screen to the physical screen */
updupd( force_f) ;
/* update the cursor and flush the buffers */
movecursor( currow, curcol - lbound) ;
TTflush() ;
#if SIGWINCH
if( chg_width || chg_height) {
newscreensize( chg_height, chg_width) ;
force_f = TRUE ;
goto resize ;
}
displaying = FALSE ;
#endif
}
/* reframe:
* check to see if the cursor is on in the window
* and re-frame it if needed or wanted
*/
static int reframe( window_p wp) {
line_p lp, lp0 ;
int i = 0 ;
/* if not a requested reframe, check for a needed one */
if( (wp->w_flag & WFFORCE) == 0) {
#if SCROLLCODE
/* loop from one line above the window to one line after */
lp = wp->w_linep ;
lp0 = lback( lp) ;
if( lp0 == wp->w_bufp->b_linep)
i = 0 ;
else {
i = -1 ;
lp = lp0 ;
}
for( ; i <= (int) (wp->w_ntrows) ; i++)
#else
lp = wp->w_linep ;
for( i = 0 ; i < wp->w_ntrows ; i++)
#endif
{
/* if the line is in the window, no reframe */
if( lp == wp->w_dotp) {
#if SCROLLCODE
/* if not _quite_ in, we'll reframe gently */
if( i < 0 || i == wp->w_ntrows) {
/* if the terminal can't help, then
we're simply outside */
if( term.t_scroll == NULL)
i = wp->w_force ;
break ;
}
#endif
return TRUE ;
}
/* if we are at the end of the file, reframe */
if( lp == wp->w_bufp->b_linep)
break ;
/* on to the next line */
lp = lforw( lp) ;
}
}
#if SCROLLCODE
if( i == -1) { /* we're just above the window */
i = scrollcount ; /* put dot at first line */
scrflags |= WFINS ;
} else if( i == wp->w_ntrows) { /* we're just below the window */
i = -scrollcount ; /* put dot at last line */
scrflags |= WFKILLS ;
} else /* put dot where requested */
#endif
i = wp->w_force ; /* (is 0, unless reposition() was called) */
wp->w_flag |= WFMODE ;
/* how far back to reframe? */
if( i > 0) { /* only one screen worth of lines max */
if( --i >= wp->w_ntrows)
i = wp->w_ntrows - 1 ;
} else if( i < 0) { /* negative update???? */
i += wp->w_ntrows ;
if( i < 0)
i = 0 ;
} else
i = wp->w_ntrows / 2 ;
/* backup to new line at top of window */
lp = wp->w_dotp ;
while( i != 0 && lback( lp) != wp->w_bufp->b_linep) {
--i ;
lp = lback( lp) ;
}
/* and reset the current line at top of window */
wp->w_linep = lp ;
wp->w_flag |= WFHARD ;
wp->w_flag &= ~WFFORCE ;
return TRUE ;
}
static void show_line( line_p lp) {
int i = 0, len = llength( lp) ;
while( i < len) {
unicode_t c ;
i += utf8_to_unicode( lp->l_text, i, len, &c) ;
vtputuc( c) ;
}
vteeol() ;
}
/* updone:
* update the current line to the virtual screen
*
* window_p wp; window to update current line in
*/
static void updone( window_p wp) {
line_p lp ;
/* search down the line we want */
int sline = wp->w_toprow ; /* physical screen line to update */
for( lp = wp->w_linep ; lp != wp->w_dotp ; lp = lforw( lp))
++sline ;
/* and update the virtual line */
vscreen[ sline]->v_flag |= VFCHG ;
vscreen[ sline]->v_flag &= ~VFREQ ;
vtmove( sline, 0) ;
show_line( lp) ;
#if COLOR
vscreen[ sline]->v_rfcolor = wp->w_fcolor ;
vscreen[ sline]->v_rbcolor = wp->w_bcolor ;
#endif
}
/* updall:
* update all the lines in a window on the virtual screen
*
* window_p wp; window to update lines in
*/
static void updall( window_p wp) {
/* search down the lines, updating them */
line_p lp = wp->w_linep ; /* line to update */
int sline = wp->w_toprow ; /* physical screen line to update */
while( sline < wp->w_toprow + wp->w_ntrows) {
/* and update the virtual line */
vscreen[ sline]->v_flag |= VFCHG ;
vscreen[ sline]->v_flag &= ~VFREQ ;
vtmove( sline, 0) ;
if( lp != wp->w_bufp->b_linep) {
/* if we are not at the end */
show_line( lp) ;
lp = lforw( lp) ;
} else
vteeol() ;
/* on to the next one */
#if COLOR
vscreen[ sline]->v_rfcolor = wp->w_fcolor ;
vscreen[ sline]->v_rbcolor = wp->w_bcolor ;
#endif
++sline ;
}
}
/* updpos:
update the position of the hardware cursor and handle extended lines.
This is the only update for simple moves.
*/
static void updpos( void) {
line_p lp ;
/* find the current row */
currow = curwp->w_toprow ;
for( lp = curwp->w_linep ; lp != curwp->w_dotp ; lp = lforw( lp))
++currow ;
/* find the current column */
curcol = 0 ;
int i = 0 ;
while( i < curwp->w_doto) {
unicode_t c ;
i += utf8_to_unicode( lp->l_text, i, curwp->w_doto, &c) ;
if( c == '\t')
curcol += tabwidth - curcol % tabwidth ;
else if( c < 0x20 || c == 0x7F)
curcol += 2 ; /* displayed as ^c */
else if( c >= 0x80 && c < 0xA0)
curcol += 3 ; /* displayed as \xx */
else
curcol += utf8_width( c) ; /* non printable are displayed as \u */
}
/* if extended, flag so and update the virtual line image */
if( curcol >= term.t_ncol - 1) {
vscreen[ currow]->v_flag |= (VFEXT | VFCHG) ;
updext() ;
} else
lbound = 0 ;
}
/* upddex:
* de-extend any line that deserves it
*/
static void upddex( void) {
for( window_p wp = wheadp ; wp != NULL ; wp = wp->w_wndp) {
line_p lp = wp->w_linep ;
for( int i = wp->w_toprow ; i < wp->w_toprow + wp->w_ntrows ; i++) {
if( vscreen[ i]->v_flag & VFEXT) {
if( (wp != curwp)
|| (lp != wp->w_dotp)
|| (curcol < term.t_ncol - 1)) {
vtmove( i, 0) ;
show_line( lp) ;
/* this line no longer is extended */
vscreen[ i]->v_flag &= ~VFEXT ;
vscreen[ i]->v_flag |= VFCHG ;
}
}
lp = lforw( lp) ;
}
}
}
/* updgar:
* if the screen is garbage, clear the physical screen and
* the virtual screen and force a full update
*/
static void updgar( void) {
for( int i = 0 ; i < term.t_nrow ; ++i) {
vscreen[ i]->v_flag |= VFCHG ;
vscreen[ i]->v_flag &= ~VFREV ;
#if COLOR
vscreen[ i]->v_fcolor = gfcolor ;
vscreen[ i]->v_bcolor = gbcolor ;
#endif
unicode_t *txt = pscreen[ i]->v_text ;
for( int j = 0 ; j < term.t_ncol ; ++j)
txt[ j] = ' ' ;
}
movecursor( 0, 0) ; /* Erase the screen. */
term.t_eeop() ;
sgarbf = FALSE ; /* Erase-page clears */
mpresf = FALSE ; /* the message area. */
#if COLOR
mlerase() ; /* needs to be cleared if colored */
#endif
}
/* updupd:
* update the physical screen from the virtual screen
*
* int force; forced update flag
*/
static void updupd( boolean force_f) {
#if SCROLLCODE
if( scrflags & WFKILLS)
scrolls( FALSE) ;
if( scrflags & WFINS)
scrolls( TRUE) ;
scrflags = 0 ;
#endif
for( int i = 0 ; i < term.t_nrow ; ++i) {
/* for each line that needs to be updated */
if( (vscreen[ i]->v_flag & VFCHG) != 0) {
#if TYPEAH && ! PKCODE
if( force_f == FALSE && typahead())
return TRUE ;
#endif
updateline( i) ;
}
}
}
#if SCROLLCODE
/* optimize out scrolls (line breaks, and newlines)
* arg. chooses between looking for inserts or deletes
* returns true if it does something
*/
static int scrolls( int inserts) {
int i, j, k ;
int count, target, end ;
int to ;
if( !term.t_scroll) /* no way to scroll */
return FALSE ;
int rows = term.t_nrow ;
int cols = term.t_ncol ;
for( i = 0 ; i < rows ; i++) /* find first wrong line */
if( !texttest( i, i))
break ;
if( i == rows) /* no text changes */
return FALSE ;
int first = i ;
video_p vpv = vscreen[ first] ;
video_p vpp = pscreen[ first] ;
if( inserts) {
/* determine types of potential scrolls */
end = endofline( vpv->v_text, cols) ;
if( end == 0)
target = first ; /* newlines */
else if( memcmp( vpp->v_text, vpv->v_text, 4*end) == 0)
target = first + 1 ; /* broken line newlines */
else
target = first ;
} else {
target = first + 1 ;
}
/* find the matching shifted area */
int match = -1 ;
int longmatch = -1 ;
int longcount = 0 ;
int from = target ;
for( i = from + 1 ; i < rows - longcount /* P.K. */ ; i++) {
if( inserts ? texttest( i, from) : texttest( from, i)) {
match = i ;
count = 1 ;
for( j = match + 1, k = from + 1 ;
j < rows && k < rows ; j++, k++) {
if( inserts ? texttest( j, k) :
texttest( k, j))
count++ ;
else
break ;
}
if( longcount < count) {
longcount = count ;
longmatch = match ;
}
}
}
match = longmatch ;
count = longcount ;
if( !inserts) {
/* full kill case? */
if( match > 0 && texttest( first, match - 1)) {
target-- ;
match-- ;
count++ ;
}
}
/* do the scroll */
if( match > 0 && count > 2) { /* got a scroll */
/* move the count lines starting at target to match */
if( inserts) {
from = target ;
to = match ;
} else {
from = match ;
to = target ;
}
if( 2 * count < abs( from - to))
return FALSE ;
scrscroll( from, to, count) ;
for( i = 0 ; i < count ; i++) {
vpp = pscreen[ to + i] ;
vpv = vscreen[ to + i] ;
memcpy( vpp->v_text, vpv->v_text, 4*cols) ;
vpp->v_flag = vpv->v_flag ; /* XXX */
if( vpp->v_flag & VFREV) {
vpp->v_flag &= ~VFREV ;
vpp->v_flag |= VFREQ ;
}
}
if( inserts) {
from = target ;
to = match ;
} else {
from = target + count ;
to = match + count ;
}
for( i = from ; i < to ; i++) {
unicode_t *txt ;
txt = pscreen[ i]->v_text ;
for( j = 0 ; j < term.t_ncol ; ++j)
txt[ j] = ' ' ;
vscreen[ i]->v_flag |= VFCHG ;
}
return TRUE ;
}
return FALSE ;
}
/* move the "count" lines starting at "from" to "to" */
static void scrscroll( int from, int to, int count) {
ttrow = ttcol = -1 ;
term.t_scroll( from, to, count) ;
}
/* return TRUE on text match
*
* int vrow, prow; virtual, physical rows
*/
static int texttest( int vrow, int prow) {
video_p vpv = vscreen[ vrow] ; /* virtual screen image */
video_p vpp = pscreen[ prow] ; /* physical screen image */
return !memcmp( vpv->v_text, vpp->v_text, 4*term.t_ncol) ;
}
/* return the index of the first blank of trailing whitespace */
static int endofline( unicode_t *s, int n) {
int i ;
for( i = n - 1 ; i >= 0 ; i--)
if( s[ i] != ' ')
return i + 1 ;
return 0 ;
}
#endif /* SCROLLCODE */
/* updext:
update the extended line which the cursor is currently on at a column
greater than the terminal width. The line will be scrolled right or
left to let the user see where the cursor is.
*/
static void updext( void) {
/* calculate what column the real cursor will end up in */
lbound = curcol - ((curcol - term.t_ncol) % term.t_scrsiz + term.t_margin) ;
/* scan through the line outputing characters to the virtual screen */
/* once we reach the left edge */
vtmove( currow, -lbound) ; /* start scanning offscreen */
show_line( curwp->w_dotp) ;
/* put a '$' in column 1 */
vscreen[ currow]->v_text[ 0] = '$' ;
}
/* Update a single line. This does not know how to use insert or delete
* character sequences; we are using VT52 functionality. Update the physical
* row and column variables. It does try an exploit erase to end of line.
*/
/* updateline()
*
* int row ; row of screen to update
*/
static void updateline( int row) {
video_p vp1 = vscreen[ row] ;
vp1->v_flag &= ~VFCHG ; /* flag this line as updated */
/* set up pointers to virtual and physical lines */
unicode_t *inp = vp1->v_text ;
unicode_t *out = pscreen[ row]->v_text ;
#if COLOR
TTforg( vp1->v_rfcolor) ;
TTbacg( vp1->v_rbcolor) ;
#endif
/* do a re-write of the entire line if there is a request to toggle the
* reverse status */
int rev = (vp1->v_flag & VFREV) == VFREV ;
if( rev != ((vp1->v_flag & VFREQ) == VFREQ)
#if COLOR
|| (vp1->v_fcolor != vp1->v_rfcolor)
|| (vp1->v_bcolor != vp1->v_rbcolor)
#endif
) {
movecursor( row, 0) ; /* Go to start of line. */
TTrev( !rev) ; /* set needed rev video state */
/* scan through the line and dump it to the screen and
the virtual screen array */
while( ttcol < term.t_ncol) {
/* TODO: handle double width unicode char at last screen col */
unicode_t c = *out++ = *inp++ ;
TTputc( c) ;
ttcol += _utf8_width( c) ; /* filtered by vtputuc */
}
TTrev( FALSE) ; /* turn rev video off */
/* update the needed flags */
vp1->v_flag ^= VFREV ;
#if COLOR
vp1->v_fcolor = vp1->v_rfcolor ;
vp1->v_bcolor = vp1->v_rbcolor ;
#endif
return ;
}
/* advance past any common chars at the left */
unicode_t *end = &vp1->v_text[ term.t_ncol] ;
int startcol = 0 ;
while( inp != end && *inp == *out) {
startcol += _utf8_width( *inp++) ; /* filtered by vtputuc */
++out ;
}
/* This can still happen, even though we only call this routine on changed
* lines. A hard update is always done when a line splits, a massive
* change is done, or a buffer is displayed twice. This optimizes out most
* of the excess updating. A lot of computes are used, but these tend to
* be hard operations that do a lot of update, so I don't really care.
*/
/* if both lines are the same, no update needs to be done */
if( inp == end)
return ;
/* find out if there is a match on the right */
int nbflag = FALSE ; /* non-blanks to the right flag? */
unicode_t *nbp = &pscreen[ row]->v_text[ term.t_ncol] ;
while( end[ -1] == nbp[ -1]) {
--end ;
--nbp ;
if( *end != ' ') /* Note if any nonblank */
nbflag = TRUE ; /* in right match. */
}
nbp = end ;
/* Erase to EOL ? */
if( nbflag == FALSE && eolexist == TRUE && (rev != TRUE)) {
while( nbp != inp && nbp[ -1] == ' ')
--nbp ;
if( end - nbp <= 3) /* Use only if erase is */
nbp = end ; /* fewer characters. */
}
movecursor( row, startcol) ; /* Go to start of line change */
TTrev( rev) ;
while( inp != nbp) { /* Copy */
unicode_t c = *out++ = *inp++ ;
TTputc( c) ;
ttcol += utf8_width( c) ;
}
if( inp != end) { /* Erase */
TTeeol() ;
do
*out++ = ' ' ;
while( ++inp != end) ;
}
TTrev( FALSE) ;
}
/* Redisplay the mode line for the window pointed to by the "wp". This is
the only routine that has any idea of how the modeline is formatted.
You can change the modeline format by hacking at this routine. Called
by "update" any time there is a dirty window.
*/
static void modeline( window_p wp) {
char tline[] = " % " ; /* formatting buffer for percentage */
int n = wp->w_toprow + wp->w_ntrows ; /* Location. */
vscreen[ n]->v_flag |= VFCHG | VFREQ | VFCOL ; /* Redraw next time. */
#if COLOR
vscreen[ n]->v_rfcolor = 0 ; /* black on */
vscreen[ n]->v_rbcolor = 7 ; /* white..... */
#endif
vtmove( n, 0) ; /* Seek to right line. */
int lchar = "-= -"[ 2 * revexist + (wp == curwp)] ; /* pick bg character */
buffer_p bp = wp->w_bufp ;
vtputuc( ((bp->b_flag & BFTRUNC) != 0) ? '#' : lchar) ; /* truncated? */
vtputuc( ((bp->b_flag & BFCHG) != 0) ? '*' : lchar) ; /* changed? */
vtputuc( ' ') ;
if( n == term.t_nrow - 1)
n = 3 + vtputs( PROGRAM_NAME_UTF8 " " VERSION ": ") ;
else
n = 3 ;
n += vtputs( bp->b_bname) ;
n += vtputs( " (") ;
/* display the modes */
int pos = n ;
if( (bp->b_flag & BFTRUNC) != 0)
n += vtputs( "Truncated") ;
for( int i = 0 ; i < NUMMODES ; i++) /* add in the mode flags */
if( wp->w_bufp->b_mode & (1 << i)) {
if( n > pos) {
vtputuc( ' ') ;
n += 1 ;
}
n += vtputs( modename[ i]) ;
}
n += vtputs( ") ") ;
if( bp->b_fname[ 0] != 0 && strcmp( bp->b_bname, bp->b_fname) != 0) {
n += vtputs( bp->b_fname) ;
vtputuc( ' ') ;
++n ;
}
while( n < term.t_ncol) { /* Pad to full width. */
vtputuc( lchar) ;
++n ;