-
Notifications
You must be signed in to change notification settings - Fork 90
/
Copy pathscreen.c
3266 lines (3014 loc) · 71.9 KB
/
screen.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) 1984-2025 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* Routines which deal with the characteristics of the terminal.
* Uses termcap to be as terminal-independent as possible.
*/
#include "less.h"
#include "cmd.h"
#if MSDOS_COMPILER
#include "pckeys.h"
#if MSDOS_COMPILER==MSOFTC
#include <graph.h>
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
#include <conio.h>
#if MSDOS_COMPILER==DJGPPC
#include <pc.h>
extern int fd0;
#endif
#else
#if MSDOS_COMPILER==WIN32C
#include <windows.h>
#endif
#endif
#endif
#include <time.h>
#ifndef FOREGROUND_BLUE
#define FOREGROUND_BLUE 0x0001
#endif
#ifndef FOREGROUND_GREEN
#define FOREGROUND_GREEN 0x0002
#endif
#ifndef FOREGROUND_RED
#define FOREGROUND_RED 0x0004
#endif
#ifndef FOREGROUND_INTENSITY
#define FOREGROUND_INTENSITY 0x0008
#endif
#else
#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
#include <termios.h>
#else
#if HAVE_TERMIO_H
#include <termio.h>
#else
#if HAVE_SGSTAT_H
#include <sgstat.h>
#else
#include <sgtty.h>
#endif
#endif
#endif
#if HAVE_NCURSESW_TERMCAP_H
#include <ncursesw/termcap.h>
#else
#if HAVE_NCURSES_TERMCAP_H
#include <ncurses/termcap.h>
#else
#if HAVE_TERMCAP_H
#include <termcap.h>
#endif
#endif
#endif
#ifdef _OSK
#include <signal.h>
#endif
#if OS2
#include <sys/signal.h>
#include "pckeys.h"
#endif
#if HAVE_SYS_STREAM_H
#include <sys/stream.h>
#endif
#if HAVE_SYS_PTEM_H
#include <sys/ptem.h>
#endif
#endif /* MSDOS_COMPILER */
/*
* Check for broken termios package that forces you to manually
* set the line discipline.
*/
#ifdef __ultrix__
#define MUST_SET_LINE_DISCIPLINE 1
#else
#define MUST_SET_LINE_DISCIPLINE 0
#endif
#if OS2
#define DEFAULT_TERM "ansi"
static char *windowid;
#else
#define DEFAULT_TERM "unknown"
#endif
#if MSDOS_COMPILER==MSOFTC
static int videopages;
static long msec_loops;
static int flash_created = 0;
#define SET_FG_COLOR(fg) _settextcolor(fg)
#define SET_BG_COLOR(bg) _setbkcolor(bg)
#define SETCOLORS(fg,bg) { SET_FG_COLOR(fg); SET_BG_COLOR(bg); }
#endif
#if MSDOS_COMPILER==BORLANDC
static unsigned short *whitescreen;
static int flash_created = 0;
#endif
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
#define _settextposition(y,x) gotoxy(x,y)
#define _clearscreen(m) clrscr()
#define _outtext(s) cputs(s)
#define SET_FG_COLOR(fg) textcolor(fg)
#define SET_BG_COLOR(bg) textbackground(bg)
#define SETCOLORS(fg,bg) { SET_FG_COLOR(fg); SET_BG_COLOR(bg); }
extern int sc_height;
#endif
#if MSDOS_COMPILER==WIN32C
#define UTF8_MAX_LENGTH 4
static WORD curr_attr;
static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */
static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */
HANDLE con_out = INVALID_HANDLE_VALUE; /* current console */
extern int utf_mode;
extern lbool quitting;
static void win32_init_term();
static void win32_deinit_term();
#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 4
#endif
#define FG_COLORS (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY)
#define BG_COLORS (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY)
#define MAKEATTR(fg,bg) ((WORD)((fg)|((bg)<<4)))
#define APPLY_COLORS() { if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \
error("SETCOLORS failed", NULL_PARG); }
#define SET_FG_COLOR(fg) { curr_attr &= ~0x0f; curr_attr |= (fg); APPLY_COLORS(); }
#define SET_BG_COLOR(bg) { curr_attr &= ~0xf0; curr_attr |= ((bg)<<4); APPLY_COLORS(); }
#define SETCOLORS(fg,bg) { curr_attr = MAKEATTR(fg,bg); APPLY_COLORS(); }
#endif
#if MSDOS_COMPILER
public int nm_fg_color = CV_ERROR; /* Color of normal text */
public int nm_bg_color = CV_ERROR;
public int nm_attr = 0;
public int bo_fg_color = CV_ERROR; /* Color of bold text */
public int bo_bg_color = CV_ERROR;
public int bo_attr = 0;
public int ul_fg_color = CV_ERROR; /* Color of underlined text */
public int ul_bg_color = CV_ERROR;
public int ul_attr = 0;
public int so_fg_color = CV_ERROR; /* Color of standout text */
public int so_bg_color = CV_ERROR;
public int so_attr = 0;
public int bl_fg_color = CV_ERROR; /* Color of blinking text */
public int bl_bg_color = CV_ERROR;
public int bl_attr = 0;
static int sy_fg_color; /* Color of system text (before less) */
static int sy_bg_color;
public int sgr_mode; /* Honor ANSI sequences rather than using above */
#if MSDOS_COMPILER==WIN32C
static DWORD init_console_output_mode;
extern DWORD init_console_input_mode;
extern DWORD curr_console_input_mode;
extern DWORD base_console_input_mode;
extern DWORD mouse_console_input_mode;
public int vt_enabled = -1; /* Is virtual terminal processing available? */
#endif
#else
/*
* Strings passed to tputs() to do various terminal functions.
*/
static constant char
*sc_pad, /* Pad string */
*sc_home, /* Cursor home */
*sc_addline, /* Add line, scroll down following lines */
*sc_lower_left, /* Cursor to last line, first column */
*sc_return, /* Cursor to beginning of current line */
*sc_move, /* General cursor positioning */
*sc_clear, /* Clear screen */
*sc_eol_clear, /* Clear to end of line */
*sc_eos_clear, /* Clear to end of screen */
*sc_s_in, /* Enter standout (highlighted) mode */
*sc_s_out, /* Exit standout mode */
*sc_u_in, /* Enter underline mode */
*sc_u_out, /* Exit underline mode */
*sc_b_in, /* Enter bold mode */
*sc_b_out, /* Exit bold mode */
*sc_bl_in, /* Enter blink mode */
*sc_bl_out, /* Exit blink mode */
*sc_visual_bell, /* Visual bell (flash screen) sequence */
*sc_backspace, /* Backspace cursor */
*sc_s_keypad, /* Start keypad mode */
*sc_e_keypad, /* End keypad mode */
*sc_s_mousecap, /* Start mouse capture mode */
*sc_e_mousecap, /* End mouse capture mode */
*sc_s_bracketed_paste, /* Start bracketed paste mode */
*sc_e_bracketed_paste, /* End bracketed paste mode */
*sc_init, /* Startup terminal initialization */
*sc_deinit; /* Exit terminal de-initialization */
static int attrcolor = -1;
#endif
static int init_done = 0;
public int auto_wrap; /* Terminal does \r\n when write past margin */
public int ignaw; /* Terminal ignores \n immediately after wrap */
public int erase_char; /* The user's erase char */
public int erase2_char; /* The user's other erase char */
public int kill_char; /* The user's line-kill char */
public int werase_char; /* The user's word-erase char */
public int sc_width, sc_height; /* Height & width of screen */
public int bo_s_width, bo_e_width; /* Printing width of boldface seq */
public int ul_s_width, ul_e_width; /* Printing width of underline seq */
public int so_s_width, so_e_width; /* Printing width of standout seq */
public int bl_s_width, bl_e_width; /* Printing width of blink seq */
public int above_mem, below_mem; /* Memory retained above/below screen */
public int can_goto_line; /* Can move cursor to any line */
public int clear_bg; /* Clear fills with background color */
public lbool missing_cap = FALSE; /* Some capability is missing */
public constant char *kent = NULL; /* Keypad ENTER sequence */
public lbool term_init_done = FALSE;
public lbool full_screen = TRUE;
static int attrmode = AT_NORMAL;
static int termcap_debug = -1;
static int no_alt_screen; /* sc_init does not switch to alt screen */
extern int binattr;
extern int one_screen;
extern int shell_lines;
#if !MSDOS_COMPILER
static constant char *cheaper(constant char *t1, constant char *t2, constant char *def);
static void tmodes(constant char *incap, constant char *outcap, constant char **instr,
constant char **outstr, constant char *def_instr, constant char *def_outstr, char **spp);
#endif
/*
* These two variables are sometimes defined in,
* and needed by, the termcap library.
*/
#if MUST_DEFINE_OSPEED
extern short ospeed; /* Terminal output baud rate */
extern char PC; /* Pad character */
#endif
#ifdef _OSK
short ospeed;
char PC_, *UP, *BC;
#endif
extern int quiet; /* If VERY_QUIET, use visual bell for bell */
extern int no_vbell;
extern int no_back_scroll;
extern int no_init;
extern int no_keypad;
extern int sigs;
extern int top_scroll;
extern int quit_if_one_screen;
extern int oldbot;
extern int mousecap;
extern int is_tty;
extern int use_color;
extern int no_paste;
#if HILITE_SEARCH
extern int hilite_search;
#endif
#if MSDOS_COMPILER==WIN32C
extern int wscroll;
extern HANDLE tty;
#else
extern int tty;
#endif
#if (HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS) || defined(TCGETA)
/*
* Set termio flags for use by less.
*/
static void set_termio_flags(
#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
struct termios *s
#else
struct termio *s
#endif
)
{
s->c_lflag &= ~(0
#ifdef ICANON
| ICANON
#endif
#ifdef ECHO
| ECHO
#endif
#ifdef ECHOE
| ECHOE
#endif
#ifdef ECHOK
| ECHOK
#endif
#ifdef ECHONL
| ECHONL
#endif
);
s->c_oflag |= (0
#ifdef OXTABS
| OXTABS
#else
#ifdef TAB3
| TAB3
#else
#ifdef XTABS
| XTABS
#endif
#endif
#endif
#ifdef OPOST
| OPOST
#endif
#ifdef ONLCR
| ONLCR
#endif
);
s->c_oflag &= ~(0
#ifdef ONOEOT
| ONOEOT
#endif
#ifdef OCRNL
| OCRNL
#endif
#ifdef ONOCR
| ONOCR
#endif
#ifdef ONLRET
| ONLRET
#endif
);
}
#endif
/*
* Change terminal to "raw mode", or restore to "normal" mode.
* "Raw mode" means
* 1. An outstanding read will complete on receipt of a single keystroke.
* 2. Input is not echoed.
* 3. On output, \n is mapped to \r\n.
* 4. \t is NOT expanded into spaces.
* 5. Signal-causing characters such as ctrl-C (interrupt),
* etc. are NOT disabled.
* It doesn't matter whether an input \n is mapped to \r, or vice versa.
*/
public void raw_mode(int on)
{
static int curr_on = 0;
if (on == curr_on)
return;
erase2_char = '\b'; /* in case OS doesn't know about erase2 */
#if LESSTEST
if (is_lesstest())
{
/* {{ For consistent conditions when running tests. }} */
erase_char = '\b';
kill_char = CONTROL('U');
werase_char = CONTROL('W');
} else
#endif /*LESSTEST*/
#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
{
struct termios s;
static struct termios save_term;
static int saved_term = 0;
if (on)
{
/*
* Get terminal modes.
*/
if (tcgetattr(tty, &s) < 0)
{
erase_char = '\b';
kill_char = CONTROL('U');
werase_char = CONTROL('W');
} else
{
/*
* Save modes and set certain variables dependent on modes.
*/
if (!saved_term)
{
save_term = s;
saved_term = 1;
}
#if HAVE_OSPEED
switch (cfgetospeed(&s))
{
#ifdef B0
case B0: ospeed = 0; break;
#endif
#ifdef B50
case B50: ospeed = 1; break;
#endif
#ifdef B75
case B75: ospeed = 2; break;
#endif
#ifdef B110
case B110: ospeed = 3; break;
#endif
#ifdef B134
case B134: ospeed = 4; break;
#endif
#ifdef B150
case B150: ospeed = 5; break;
#endif
#ifdef B200
case B200: ospeed = 6; break;
#endif
#ifdef B300
case B300: ospeed = 7; break;
#endif
#ifdef B600
case B600: ospeed = 8; break;
#endif
#ifdef B1200
case B1200: ospeed = 9; break;
#endif
#ifdef B1800
case B1800: ospeed = 10; break;
#endif
#ifdef B2400
case B2400: ospeed = 11; break;
#endif
#ifdef B4800
case B4800: ospeed = 12; break;
#endif
#ifdef B9600
case B9600: ospeed = 13; break;
#endif
#ifdef EXTA
case EXTA: ospeed = 14; break;
#endif
#ifdef EXTB
case EXTB: ospeed = 15; break;
#endif
#ifdef B57600
case B57600: ospeed = 16; break;
#endif
#ifdef B115200
case B115200: ospeed = 17; break;
#endif
default: ;
}
#endif
erase_char = s.c_cc[VERASE];
#ifdef VERASE2
erase2_char = s.c_cc[VERASE2];
#endif
kill_char = s.c_cc[VKILL];
#ifdef VWERASE
werase_char = s.c_cc[VWERASE];
#else
werase_char = CONTROL('W');
#endif
/*
* Set the modes to the way we want them.
*/
set_termio_flags(&s);
s.c_cc[VMIN] = 1;
s.c_cc[VTIME] = 0;
#ifdef VLNEXT
s.c_cc[VLNEXT] = 0;
#endif
#ifdef VDSUSP
s.c_cc[VDSUSP] = 0;
#endif
#ifdef VSTOP
s.c_cc[VSTOP] = 0;
#endif
#ifdef VSTART
s.c_cc[VSTART] = 0;
#endif
#ifdef VDISCARD
s.c_cc[VDISCARD] = 0;
#endif
#if MUST_SET_LINE_DISCIPLINE
/*
* System's termios is broken; need to explicitly
* request TERMIODISC line discipline.
*/
s.c_line = TERMIODISC;
#endif
}
} else
{
/*
* Restore saved modes.
*/
s = save_term;
}
#if HAVE_FSYNC
fsync(tty);
#endif
tcsetattr(tty, TCSADRAIN, &s);
#if MUST_SET_LINE_DISCIPLINE
if (!on)
{
/*
* Broken termios *ignores* any line discipline
* except TERMIODISC. A different old line discipline
* is therefore not restored, yet. Restore the old
* line discipline by hand.
*/
ioctl(tty, TIOCSETD, &save_term.c_line);
}
#endif
}
#else
#ifdef TCGETA
{
struct termio s;
static struct termio save_term;
static int saved_term = 0;
if (on)
{
/*
* Get terminal modes.
*/
ioctl(tty, TCGETA, &s);
/*
* Save modes and set certain variables dependent on modes.
*/
if (!saved_term)
{
save_term = s;
saved_term = 1;
}
#if HAVE_OSPEED
ospeed = s.c_cflag & CBAUD;
#endif
erase_char = s.c_cc[VERASE];
kill_char = s.c_cc[VKILL];
#ifdef VWERASE
werase_char = s.c_cc[VWERASE];
#else
werase_char = CONTROL('W');
#endif
/*
* Set the modes to the way we want them.
*/
set_termio_flags(&s);
s.c_cc[VMIN] = 1;
s.c_cc[VTIME] = 0;
#ifdef VSTOP
s.c_cc[VSTOP] = 0;
#endif
#ifdef VSTART
s.c_cc[VSTART] = 0;
#endif
} else
{
/*
* Restore saved modes.
*/
s = save_term;
}
ioctl(tty, TCSETAW, &s);
}
#else
#ifdef TIOCGETP
{
struct sgttyb s;
static struct sgttyb save_term;
static int saved_term = 0;
if (on)
{
/*
* Get terminal modes.
*/
ioctl(tty, TIOCGETP, &s);
/*
* Save modes and set certain variables dependent on modes.
*/
if (!saved_term)
{
save_term = s;
saved_term = 1;
}
#if HAVE_OSPEED
ospeed = s.sg_ospeed;
#endif
erase_char = s.sg_erase;
kill_char = s.sg_kill;
werase_char = CONTROL('W');
/*
* Set the modes to the way we want them.
*/
s.sg_flags |= CBREAK;
s.sg_flags &= ~(ECHO|XTABS);
} else
{
/*
* Restore saved modes.
*/
s = save_term;
}
ioctl(tty, TIOCSETN, &s);
}
#else
#ifdef _OSK
{
struct sgbuf s;
static struct sgbuf save_term;
static int saved_term = 0;
if (on)
{
/*
* Get terminal modes.
*/
_gs_opt(tty, &s);
/*
* Save modes and set certain variables dependent on modes.
*/
if (!saved_term)
{
save_term = s;
saved_term = 1;
}
erase_char = s.sg_bspch;
kill_char = s.sg_dlnch;
werase_char = CONTROL('W');
/*
* Set the modes to the way we want them.
*/
s.sg_echo = 0;
s.sg_eofch = 0;
s.sg_pause = 0;
s.sg_psch = 0;
} else
{
/*
* Restore saved modes.
*/
s = save_term;
}
_ss_opt(tty, &s);
}
#else
/* MS-DOS, Windows, or OS2 */
#if OS2
/* OS2 */
LSIGNAL(SIGINT, SIG_IGN);
#endif
erase_char = '\b';
#if MSDOS_COMPILER==DJGPPC
kill_char = CONTROL('U');
/*
* So that when we shell out or run another program, its
* stdin is in cooked mode. We do not switch stdin to binary
* mode if fd0 is zero, since that means we were called before
* tty was reopened in open_getchr, in which case we would be
* changing the original stdin device outside less.
*/
if (fd0 != 0)
setmode(0, on ? O_BINARY : O_TEXT);
#else
kill_char = ESC;
#endif
werase_char = CONTROL('W');
#endif
#endif
#endif
#endif
curr_on = on;
}
#if !MSDOS_COMPILER
/*
* Some glue to prevent calling termcap functions if tgetent() failed.
*/
static int hardcopy;
static constant char * ltget_env(constant char *capname)
{
char name[64];
if (termcap_debug)
{
struct env { struct env *next; char *name; char *value; };
static struct env *envs = NULL;
struct env *p;
for (p = envs; p != NULL; p = p->next)
if (strcmp(p->name, capname) == 0)
return p->value;
p = (struct env *) ecalloc(1, sizeof(struct env));
p->name = save(capname);
p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char));
sprintf(p->value, "<%s>", capname);
p->next = envs;
envs = p;
return p->value;
}
SNPRINTF1(name, sizeof(name), "LESS_TERMCAP_%s", capname);
return (lgetenv(name));
}
static int ltgetflag(constant char *capname)
{
constant char *s;
if ((s = ltget_env(capname)) != NULL)
return (*s != '\0' && *s != '0');
if (hardcopy)
return (0);
return (tgetflag(capname));
}
static int ltgetnum(constant char *capname)
{
constant char *s;
if ((s = ltget_env(capname)) != NULL)
return (atoi(s));
if (hardcopy)
return (-1);
return (tgetnum(capname));
}
static constant char * ltgetstr(constant char *capname, char **pp)
{
constant char *s;
if ((s = ltget_env(capname)) != NULL)
return (s);
if (hardcopy)
return (NULL);
return (tgetstr(capname, pp));
}
#endif /* MSDOS_COMPILER */
/*
* Get size of the output screen.
*/
static void scrsize(void)
{
constant char *s;
int sys_height;
int sys_width;
#if !MSDOS_COMPILER
int n;
#endif
#define DEF_SC_WIDTH 80
#if MSDOS_COMPILER
#define DEF_SC_HEIGHT 25
#else
#define DEF_SC_HEIGHT 24
#endif
sys_width = sys_height = 0;
#if LESSTEST
if (0) /* can't use is_lesstest(): ttyin_name may not be set by scan_option yet */
#endif /*LESSTEST*/
{
#if MSDOS_COMPILER==MSOFTC
{
struct videoconfig w;
_getvideoconfig(&w);
sys_height = w.numtextrows;
sys_width = w.numtextcols;
}
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
{
struct text_info w;
gettextinfo(&w);
sys_height = w.screenheight;
sys_width = w.screenwidth;
}
#else
#if MSDOS_COMPILER==WIN32C
{
CONSOLE_SCREEN_BUFFER_INFO scr;
GetConsoleScreenBufferInfo(con_out, &scr);
sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
}
#else
#if OS2
{
int s[2];
_scrsize(s);
sys_width = s[0];
sys_height = s[1];
/*
* When using terminal emulators for XFree86/OS2, the
* _scrsize function does not work well.
* Call the scrsize.exe program to get the window size.
*/
windowid = getenv("WINDOWID");
if (windowid != NULL)
{
FILE *fd = popen("scrsize", "rt");
if (fd != NULL)
{
int w, h;
fscanf(fd, "%i %i", &w, &h);
if (w > 0 && h > 0)
{
sys_width = w;
sys_height = h;
}
pclose(fd);
}
}
}
#else
#ifdef TIOCGWINSZ
{
struct winsize w;
if (ioctl(2, TIOCGWINSZ, &w) == 0)
{
if (w.ws_row > 0)
sys_height = w.ws_row;
if (w.ws_col > 0)
sys_width = w.ws_col;
}
}
#else
#ifdef WIOCGETD
{
struct uwdata w;
if (ioctl(2, WIOCGETD, &w) == 0)
{
if (w.uw_height > 0)
sys_height = w.uw_height / w.uw_vs;
if (w.uw_width > 0)
sys_width = w.uw_width / w.uw_hs;
}
}
#endif
#endif
#endif
#endif
#endif
#endif
}
if (sys_height > 0)
sc_height = sys_height;
else if ((s = lgetenv("LINES")) != NULL)
sc_height = atoi(s);
#if !MSDOS_COMPILER
else if ((n = ltgetnum("li")) > 0)
sc_height = n;
#endif
if ((s = lgetenv("LESS_LINES")) != NULL)
{
int height = atoi(s);
sc_height = (height < 0) ? sc_height + height : height;
full_screen = FALSE;
}
if (sc_height <= 0)
sc_height = DEF_SC_HEIGHT;
if (sys_width > 0)
sc_width = sys_width;
else if ((s = lgetenv("COLUMNS")) != NULL)
sc_width = atoi(s);
#if !MSDOS_COMPILER
else if ((n = ltgetnum("co")) > 0)
sc_width = n;
#endif
if ((s = lgetenv("LESS_COLUMNS")) != NULL)
{
int width = atoi(s);
sc_width = (width < 0) ? sc_width + width : width;
}
if (sc_width <= 0)
sc_width = DEF_SC_WIDTH;
screen_size_changed();
}
/*
* Recalculate things that depend on the screen size.
*/
public void screen_size_changed(void)
{
calc_jump_sline();
calc_shift_count();
calc_match_shift();
}
#if MSDOS_COMPILER==MSOFTC
/*
* Figure out how many empty loops it takes to delay a millisecond.
*/
static void get_clock(void)
{
clock_t start;
/*
* Get synchronized at the start of a tick.
*/
start = clock();
while (clock() == start)
;
/*
* Now count loops till the next tick.
*/
start = clock();
msec_loops = 0;
while (clock() == start)
msec_loops++;
/*
* Convert from (loops per clock) to (loops per millisecond).
*/
msec_loops *= CLOCKS_PER_SEC;
msec_loops /= 1000;
}
/*
* Delay for a specified number of milliseconds.
*/
static void delay(int msec)
{
long i;
while (msec-- > 0)
{
for (i = 0; i < msec_loops; i++)
(void) clock();
}
}
#endif
/*
* Return the characters actually input by a "special" key.
*/
public constant char * special_key_str(int key)
{
static char tbuf[40];
constant char *s;
#if MSDOS_COMPILER || OS2
static char k_right[] = { '\340', PCK_RIGHT, 0 };
static char k_left[] = { '\340', PCK_LEFT, 0 };
static char k_ctl_right[] = { '\340', PCK_CTL_RIGHT, 0 };
static char k_ctl_left[] = { '\340', PCK_CTL_LEFT, 0 };
static char k_insert[] = { '\340', PCK_INSERT, 0 };
static char k_delete[] = { '\340', PCK_DELETE, 0 };
static char k_ctl_delete[] = { '\340', PCK_CTL_DELETE, 0 };
static char k_ctl_backspace[] = { '\177', 0 };
static char k_backspace[] = { '\b', 0 };
static char k_home[] = { '\340', PCK_HOME, 0 };
static char k_end[] = { '\340', PCK_END, 0 };
static char k_up[] = { '\340', PCK_UP, 0 };
static char k_down[] = { '\340', PCK_DOWN, 0 };
static char k_backtab[] = { '\340', PCK_SHIFT_TAB, 0 };
static char k_pagedown[] = { '\340', PCK_PAGEDOWN, 0 };
static char k_pageup[] = { '\340', PCK_PAGEUP, 0 };
static char k_f1[] = { '\340', PCK_F1, 0 };
#endif
#if !MSDOS_COMPILER