-
Notifications
You must be signed in to change notification settings - Fork 0
/
dos.c
848 lines (771 loc) · 17.7 KB
/
dos.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
#ifdef __DJGPP
#include "links.h"
#include <pc.h>
#include <dpmi.h>
#include <bios.h>
#include <go32.h>
#include <libc/dosio.h>
#include <sys/exceptn.h>
#include <sys/movedata.h>
#define VIRTUAL_PIPE_SIZE 512
#define DOS_MOUSE_FLUSH_TIME 300
#undef read
#undef write
#undef pipe
#undef close
#undef select
/*
* Asynchronous exits from signal handler cause a crash if they interrupt
* networking in a wrong place. So, we use synchronous exit.
*/
static volatile unsigned char break_pressed = 0;
static volatile unsigned char break_exiting = 0;
void dos_poll_break(void)
{
if (break_pressed && !break_exiting) {
break_exiting = 1;
fatal_exit("Exiting on Ctrl+Break");
}
}
static void sigbreak(int sig)
{
break_pressed = 1;
}
void get_terminal_size(int *x, int *y)
{
*x = ScreenCols();
*y = ScreenRows();
}
void handle_terminal_resize(void (*fn)(int, int), int *x, int *y)
{
get_terminal_size(x, y);
}
void unhandle_terminal_resize(void)
{
}
static size_t init_seq_len;
static unsigned char screen_initialized = 0;
static unsigned char *screen_backbuffer = NULL;
static int screen_backbuffer_x;
static int screen_backbuffer_y;
static int saved_cursor_x;
static int saved_cursor_y;
static unsigned char screen_default_attr;
static unsigned cursor_x;
static unsigned cursor_y;
static unsigned current_attr;
static unsigned char dos_mouse_initialized = 0;
static unsigned char dos_mouse_buttons;
static int dos_mouse_last_x;
static int dos_mouse_last_y;
static int dos_mouse_last_button;
static uttime dos_mouse_time;
static struct links_event *dos_mouse_queue = DUMMY;
static int dos_mouse_queue_n;
static void (*txt_mouse_handler)(void *, unsigned char *, int) = NULL;
static void *txt_mouse_data;
static int dos_mouse_coord(int v)
{
if (!F) v /= 8;
return v;
}
static void dos_mouse_show(void)
{
if (dos_mouse_initialized && !F) {
__dpmi_regs r;
memset(&r, 0, sizeof r);
r.x.ax = 1;
__dpmi_int(0x33, &r);
}
}
static void dos_mouse_hide(void)
{
if (dos_mouse_initialized && !F) {
__dpmi_regs r;
memset(&r, 0, sizeof r);
r.x.ax = 2;
__dpmi_int(0x33, &r);
}
}
static void dos_mouse_init(unsigned x, unsigned y)
{
__dpmi_regs r;
memset(&r, 0, sizeof r);
__dpmi_int(0x33, &r);
if (r.x.ax != 0xffff) return;
dos_mouse_buttons = r.x.bx == 3 ? 3 : 2;
dos_mouse_initialized = 1;
memset(&r, 0, sizeof r);
r.x.ax = 7;
r.x.cx = 0;
r.x.dx = x - 1;
__dpmi_int(0x33, &r);
memset(&r, 0, sizeof r);
r.x.ax = 8;
r.x.cx = 0;
r.x.dx = y - 1;
__dpmi_int(0x33, &r);
memset(&r, 0, sizeof r);
r.x.ax = 3;
__dpmi_int(0x33, &r);
dos_mouse_last_x = dos_mouse_coord(r.x.cx);
dos_mouse_last_y = dos_mouse_coord(r.x.dx);
dos_mouse_last_button = r.x.bx;
dos_mouse_time = get_time();
}
void dos_mouse_terminate(void)
{
mem_free(dos_mouse_queue);
dos_mouse_queue = DUMMY;
dos_mouse_queue_n = 0;
dos_mouse_hide();
}
static void dos_mouse_enqueue(int x, int y, int b)
{
if (dos_mouse_queue_n && ((b & BM_ACT) == B_DRAG || (b & BM_ACT) == B_MOVE) && (b & BM_ACT) == (dos_mouse_queue[dos_mouse_queue_n - 1].b & BM_ACT)) {
dos_mouse_queue_n--;
goto set_last;
}
if ((unsigned)dos_mouse_queue_n > (unsigned)MAXINT / sizeof(struct links_event) - 1) overalloc();
dos_mouse_queue = mem_realloc(dos_mouse_queue, (dos_mouse_queue_n + 1) * sizeof(struct links_event));
set_last:
dos_mouse_queue[dos_mouse_queue_n].ev = EV_MOUSE;
dos_mouse_queue[dos_mouse_queue_n].x = x;
dos_mouse_queue[dos_mouse_queue_n].y = y;
dos_mouse_queue[dos_mouse_queue_n].b = b;
dos_mouse_queue_n++;
}
static int dos_mouse_button(int b)
{
switch (b) {
default:
case 0: return B_LEFT;
case 1: return B_RIGHT;
case 2: return B_MIDDLE;
}
}
static void dos_mouse_poll(void)
{
int i;
int cx, cy;
__dpmi_regs r;
dos_poll_break();
if (dos_mouse_initialized) {
if (dos_mouse_initialized == 1 && get_time() - dos_mouse_time > DOS_MOUSE_FLUSH_TIME)
dos_mouse_initialized = 2;
for (i = 0; i < dos_mouse_buttons; i++) {
if (dos_mouse_initialized == 1 && i > 0) {
memset(&r, 0, sizeof r);
r.x.ax = 5;
r.x.bx = i;
__dpmi_int(0x33, &r);
memset(&r, 0, sizeof r);
r.x.ax = 6;
r.x.bx = i;
__dpmi_int(0x33, &r);
continue;
}
memset(&r, 0, sizeof r);
r.x.ax = !(dos_mouse_last_button & (1 << i)) ? 5 : 6;
r.x.bx = i;
__dpmi_int(0x33, &r);
px:
if (r.x.bx) {
dos_mouse_last_x = dos_mouse_coord(r.x.cx);
dos_mouse_last_y = dos_mouse_coord(r.x.dx);
dos_mouse_last_button ^= 1 << i;
dos_mouse_enqueue(dos_mouse_last_x, dos_mouse_last_y, dos_mouse_button(i) | (dos_mouse_last_button & (1 << i) ? B_DOWN : B_UP));
/*printf("%s %d %d\n", dos_mouse_last_button & (1 << i) ? "press" : "release", r.x.cx, r.x.dx);*/
if (!((dos_mouse_last_button ^ r.x.ax) & (1 << i))) {
memset(&r, 0, sizeof r);
r.x.ax = !(dos_mouse_last_button & (1 << i)) ? 5 : 6;
r.x.bx = i;
__dpmi_int(0x33, &r);
if ((dos_mouse_last_button ^ r.x.ax) & (1 << i))
goto px;
}
}
}
memset(&r, 0, sizeof r);
r.x.ax = 3;
__dpmi_int(0x33, &r);
cx = dos_mouse_coord(r.x.cx);
cy = dos_mouse_coord(r.x.dx);
if (cx != dos_mouse_last_x || cy != dos_mouse_last_y) {
for (i = 0; i < dos_mouse_buttons; i++)
if (dos_mouse_last_button & (1 << i)) {
dos_mouse_enqueue(cx, cy, B_DRAG | dos_mouse_button(i));
goto x;
}
if (F) dos_mouse_enqueue(cx, cy, B_MOVE);
x:
dos_mouse_last_x = cx;
dos_mouse_last_y = cy;
}
}
#if defined(G) && defined(GRDRV_GRX)
if (grx_mouse_initialized) {
grx_mouse_poll();
}
#endif
}
void *handle_mouse(int cons, void (*fn)(void *, unsigned char *, int), void *data)
{
int x, y;
get_terminal_size(&x, &y);
dos_mouse_init(x * 8, y * 8);
if (!dos_mouse_initialized) return NULL;
dos_mouse_show();
txt_mouse_handler = fn;
txt_mouse_data = data;
return DUMMY;
}
void unhandle_mouse(void *data)
{
dos_mouse_terminate();
txt_mouse_handler = NULL;
}
void want_draw(void)
{
dos_mouse_hide();
}
void done_draw(void)
{
dos_mouse_show();
}
static int dos_mouse_event(void)
{
if (dos_mouse_queue_n) {
if (!F && txt_mouse_handler) {
struct links_event *q = dos_mouse_queue;
int ql = dos_mouse_queue_n;
dos_mouse_queue = DUMMY;
dos_mouse_queue_n = 0;
txt_mouse_handler(txt_mouse_data, (unsigned char *)(void *)q, ql * sizeof(struct links_event));
mem_free(q);
return 1;
}
}
#if defined(G) && defined(GRDRV_GRX)
if (grx_mouse_initialized) {
return grx_mouse_event();
}
#endif
return 0;
}
void save_terminal(void)
{
unsigned char *sc;
screen_backbuffer_x = ScreenCols();
screen_backbuffer_y = ScreenRows();
screen_default_attr = ScreenAttrib;
if (screen_backbuffer) {
sc = screen_backbuffer;
screen_backbuffer = NULL;
mem_free(sc);
}
sc = mem_alloc(2 * screen_backbuffer_x * screen_backbuffer_y);
ScreenRetrieve(sc);
ScreenGetCursor(&saved_cursor_y, &saved_cursor_x);
screen_backbuffer = sc;
}
void restore_terminal(void)
{
if (screen_backbuffer) {
unsigned char *sc;
if (ScreenCols() == screen_backbuffer_x && ScreenRows() == screen_backbuffer_y) {
ScreenUpdate(screen_backbuffer);
ScreenSetCursor(saved_cursor_y, saved_cursor_x);
}
sc = screen_backbuffer;
screen_backbuffer = NULL;
mem_free(sc);
}
}
static void ansi_initialize(void)
{
if (screen_initialized)
return;
ScreenClear();
cursor_x = 0;
cursor_y = 0;
current_attr = screen_default_attr;
screen_initialized = 1;
}
static void ansi_terminate(void)
{
if (!screen_initialized)
return;
ScreenSetCursor(0, 0);
screen_initialized = 0;
}
static unsigned ansi2pc(unsigned c)
{
return ((c & 4) >> 2) | (c & 2) | ((c & 1) << 2);
}
static void ansi_write(const unsigned char *str, size_t size)
{
if (!screen_initialized) {
if (size >= init_seq_len && !memcmp(str, init_seq, init_seq_len)) {
ansi_initialize();
goto process_ansi;
}
write(1, str, size);
return;
}
process_ansi:
while (size--) {
unsigned char c = *str++;
unsigned char buffer[128];
unsigned buf_size;
unsigned clen;
unsigned x, y;
switch (c) {
case 7:
continue;
case 10:
cursor_y++;
/*-fallthrough*/
case 13:
cursor_x = 0;
break;
case 27:
if (!size--) goto ret;
switch (*str++) {
case ')':
if (!size--) goto ret;
str++;
continue;
case '7':
default:
continue;
case '8':
ansi_terminate();
goto ret2;
case '[':
clen = 0;
while (1) {
unsigned char u;
if (clen >= size) goto ret;
u = upcase(str[clen]);
if (u >= 'A' && u <= 'Z')
break;
clen++;
}
}
if (clen >= sizeof(buffer)) goto ret;
memcpy(buffer, str, clen);
buffer[clen] = 0;
switch (str[clen]) {
case 'J':
if (!strcmp(cast_const_char buffer, "2"))
ScreenClear();
break;
case 'H':
if (sscanf(cast_const_char buffer, "%u;%u", &y, &x) == 2) {
cursor_x = x - 1;
cursor_y = y - 1;
}
break;
case 'm':
while (buffer[0] >= '0' && buffer[0] < '9') {
unsigned long a;
char *e;
a = strtoul(cast_const_char buffer, &e, 10);
if (*e == ';') e++;
memmove(buffer, e, strlen(cast_const_char e) + 1);
switch (a) {
case 0:
current_attr = screen_default_attr;
break;
case 1:
current_attr |= 0x08;
break;
case 7:
current_attr = ((screen_default_attr & 0x70) >> 4) | ((screen_default_attr & 0x07) << 4);
break;
case 30: case 31: case 32: case 33: case 34: case 35: case 36: case 37:
current_attr = (current_attr & 0x78) | ansi2pc(a - 30);
break;
case 40: case 41: case 42: case 43: case 44: case 45: case 46: case 47:
current_attr = (current_attr & 0x0f) | (ansi2pc(a - 40) << 4);
break;
}
}
break;
}
str += clen + 1;
size -= clen + 1;
continue;
default:
buffer[0] = c;
buf_size = 1;
while (size && *str >= ' ' && buf_size < sizeof(buffer) - 1) {
buffer[buf_size++] = *str++;
size--;
}
buffer[buf_size] = 0;
ScreenPutString(cast_const_char buffer, current_attr, cursor_x, cursor_y);
cursor_x += buf_size;
break;
}
}
ret:
ScreenSetCursor(cursor_y, cursor_x);
ret2:;
}
#ifdef DOS_EXTRA_KEYBOARD
static short dos_buffered_char = -1;
static int dos_select_keyboard(void)
{
int bk;
if (dos_buffered_char >= 0) return 1;
bk = bioskey(0x11);
return !!bk;
}
static int dos_read_keyboard(void *buf, size_t size)
{
int k;
if (!size) return 0;
if (dos_buffered_char >= 0) {
*(unsigned char *)buf = dos_buffered_char;
dos_buffered_char = -1;
return 1;
}
k = getkey();
if (!k) return 0;
/*printf("returned key %04x\n", k);*/
if (k < 0x100) {
*(unsigned char *)buf = k;
return 1;
} else {
*(unsigned char *)buf = 0;
if (size >= 2) {
*((unsigned char *)buf + 1) = k;
return 2;
} else {
dos_buffered_char = k & 0xff;
return 1;
}
}
}
#endif
static inline void pipe_lock(void)
{
}
static inline void pipe_unlock(void)
{
}
static inline void pipe_unlock_wait(void)
{
}
static inline void pipe_wake(void)
{
}
#include "vpipe.inc"
int dos_pipe(int fd[2])
{
int r = vpipe_create(fd);
/*printf("dos_pipe: (%d) : %d,%d\n", r, fd[0], fd[1]);*/
return r;
}
int dos_read(int fd, void *buf, size_t size)
{
int r;
dos_mouse_poll();
r = vpipe_read(fd, buf, size);
/*printf("dos_read(%d,%d) : %d,%d\n", r, errno, fd, size);*/
if (r != -2) return r;
#ifdef DOS_EXTRA_KEYBOARD
if (fd == 0) return dos_read_keyboard(buf, size);
#endif
return read(fd, buf, size);
}
int dos_write(int fd, const void *buf, size_t size)
{
int r;
dos_mouse_poll();
r = vpipe_write(fd, buf, size);
/*printf("dos_write(%d,%d) : %d,%d\n", r, errno, fd, size);*/
if (r != -2) return r;
if (fd == 1) {
ansi_write(buf, size);
return size;
}
return write(fd, buf, size);
}
int dos_close(int fd)
{
int r;
r = vpipe_close(fd);
if (r != -2) return r;
return close(fd);
}
int dos_select(int n, fd_set *rs, fd_set *ws, fd_set *es, struct timeval *t, int from_main_loop)
{
int i;
int last_pass = 0;
int ret_cnt = 0;
int r;
fd_set rsb, wsb, esb;
struct timeval xtime;
dos_mouse_poll();
pipe_lock();
for (i = 0; i < n; i++) {
int ts = 0;
if (rs && FD_ISSET(i, rs)) {
int signaled = 0;
if (pipe_desc[i]) {
if (vpipe_may_read(i))
signaled = 1;
else
FD_CLR(i, rs);
/*printf("dos_select_read(%d) : %d\n", i, vpipe_may_read(i));*/
} else {
}
if (!last_pass) {
if (signaled) {
clear_inactive(rs, i);
clear_inactive(ws, i);
clear_inactive(es, i);
last_pass = 1;
}
} else {
if (!signaled) FD_CLR(i, rs);
}
ts |= signaled;
}
if (ws && FD_ISSET(i, ws)) {
int signaled = 0;
if (pipe_desc[i]) {
if (vpipe_may_write(i))
signaled = 1;
else
FD_CLR(i, ws);
/*printf("dos_select_write(%d) : %d\n", i, vpipe_may_write(i));*/
} else {
}
if (!last_pass) {
if (signaled) {
clear_inactive(rs, i + 1);
clear_inactive(ws, i);
clear_inactive(es, i);
last_pass = 1;
}
} else {
if (!signaled) FD_CLR(i, ws);
}
ts |= signaled;
}
if (es && FD_ISSET(i, es)) {
int signaled = 0;
if (pipe_desc[i]) {
FD_CLR(i, es);
} else {
}
if (!last_pass) {
if (signaled) {
clear_inactive(rs, i + 1);
clear_inactive(ws, i + 1);
clear_inactive(es, i);
last_pass = 1;
}
} else {
if (!signaled) FD_CLR(i, es);
}
ts |= signaled;
}
if (last_pass) ret_cnt += ts;
}
pipe_unlock();
if (last_pass) {
/*printf("ret_cnt: %d\n", ret_cnt);*/
return ret_cnt;
}
/*printf("real select\n");*/
/*return select(n, rs, ws, es, t);*/
if (rs) rsb = *rs;
else FD_ZERO(&rsb);
if (ws) wsb = *ws;
else FD_ZERO(&wsb);
if (es) esb = *es;
else FD_ZERO(&esb);
if (t) {
EINTRLOOP(r, gettimeofday(&xtime, NULL));
if (r) fatal_exit("gettimeofday failed: %d", errno);
xtime.tv_usec += t->tv_usec;
if (xtime.tv_usec >= 1000000) {
xtime.tv_usec -= 1000000;
xtime.tv_sec++;
}
xtime.tv_sec += t->tv_sec;
}
while (1) {
struct timeval zero = { 0, 0 };
struct timeval now;
#ifdef DOS_EXTRA_KEYBOARD
if (rs && FD_ISSET(0, rs)) {
if (dos_select_keyboard()) {
FD_ZERO(rs);
FD_SET(0, rs);
if (ws) FD_ZERO(ws);
if (es) FD_ZERO(es);
if (from_main_loop && dos_mouse_event())
check_bottom_halves();
return 1;
}
FD_CLR(0, rs);
}
#endif
if (from_main_loop && dos_mouse_event()) {
check_bottom_halves();
return 0;
}
r = select(n, rs, ws, es, &zero);
if (r == -1 && errno == EBADF) {
/* DJGPP occasionally returns EBADF */
int re = 0;
if (rs) FD_ZERO(rs);
if (ws) FD_ZERO(ws);
if (es) FD_ZERO(es);
i = 0;
#ifdef DOS_EXTRA_KEYBOARD
i++;
#endif
for (; i < n; i++) {
fd_set rsx;
fd_set wsx;
fd_set esx;
int x, s;
if (!FD_ISSET(i, &rsb) &&
!FD_ISSET(i, &wsb) &&
!FD_ISSET(i, &esb))
continue;
FD_ZERO(&rsx);
FD_ZERO(&wsx);
FD_ZERO(&esx);
if (FD_ISSET(i, &rsb)) FD_SET(i, &rsx);
if (FD_ISSET(i, &wsb)) FD_SET(i, &wsx);
if (FD_ISSET(i, &esb)) FD_SET(i, &esx);
zero.tv_sec = 0;
zero.tv_usec = 0;
x = select(i + 1, &rsx, &wsx, &esx, &zero);
s = 0;
if (FD_ISSET(i, &rsb) && (x < 0 || (x > 0 && FD_ISSET(i, &rsx)))) FD_SET(i, rs), s = 1;
if (FD_ISSET(i, &wsb) && (x < 0 || (x > 0 && FD_ISSET(i, &wsx)))) FD_SET(i, ws), s = 1;
if (FD_ISSET(i, &esb) && (x < 0 || (x > 0 && FD_ISSET(i, &esx)))) FD_SET(i, es), s = 1;
if (s) re++;
}
if (re) return re;
r = 0;
}
if (r) return r;
EINTRLOOP(r, gettimeofday(&now, NULL));
if (r) fatal_exit("gettimeofday failed: %d", errno);
if (t) {
if (now.tv_sec > xtime.tv_sec ||
(now.tv_sec == xtime.tv_sec && now.tv_usec >= xtime.tv_usec))
return 0;
}
if (rs) *rs = rsb;
if (ws) *ws = wsb;
if (es) *es = esb;
dos_mouse_poll();
__dpmi_yield();
dos_mouse_poll();
}
}
#ifdef DOS_EXTRA_KEYBOARD
int setraw(int ctl, int save)
{
__djgpp_set_ctrl_c(0);
return 0;
}
void setcooked(int ctl)
{
}
#endif
#define RANDOM_POOL_SIZE 65536
void os_seed_random(unsigned char **pool, int *pool_size)
{
unsigned *random_pool, *tmp_pool;
int a, i;
random_pool = mem_alloc(RANDOM_POOL_SIZE);
tmp_pool = mem_alloc(RANDOM_POOL_SIZE);
for (a = 0; a <= 640 * 1024 - RANDOM_POOL_SIZE; a += RANDOM_POOL_SIZE) {
dosmemget(a, RANDOM_POOL_SIZE, tmp_pool);
for (i = 0; i < RANDOM_POOL_SIZE / 4; i++)
random_pool[i] += tmp_pool[i];
}
mem_free(tmp_pool);
*pool = (unsigned char *)(void *)random_pool;
*pool_size = RANDOM_POOL_SIZE;
}
void init_os(void)
{
int s, rs;
struct sigaction sa;
#ifdef _STAT_INODE
_djstat_flags |= _STAT_INODE;
#endif
#ifdef _STAT_EXEC_EXT
_djstat_flags |= _STAT_EXEC_EXT;
#endif
#ifdef _STAT_EXEC_MAGIC
_djstat_flags |= _STAT_EXEC_MAGIC;
#endif
init_seq_len = strlen(cast_const_char init_seq);
/* preload the packet driver */
s = c_socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s >= 0) {
EINTRLOOP(rs, close(s));
}
tcp_cbreak(1);
memset(&sa, 0, sizeof sa);
sa.sa_handler = sigbreak;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
EINTRLOOP(rs, sigaction(SIGINT, &sa, NULL));
}
void terminate_osdep(void)
{
if (screen_backbuffer)
mem_free(screen_backbuffer);
}
int os_default_language(void)
{
__dpmi_regs r;
memset(&r, 0, sizeof r);
r.x.ax = 0x3800;
r.x.dx = __tb_offset;
r.x.ds = __tb_segment;
__dpmi_int(0x21, &r);
if (!(r.x.flags & 1)) {
return get_country_language(r.x.bx);
}
return -1;
}
int os_default_charset(void)
{
__dpmi_regs r;
memset(&r, 0, sizeof r);
r.x.ax = 0x6601;
__dpmi_int(0x21, &r);
if (!(r.x.flags & 1)) {
unsigned char a[8];
int cp;
snprintf(cast_char a, sizeof a, "%d", r.x.bx);
if ((cp = get_cp_index(a)) >= 0 && cp != utf8_table)
return cp;
}
return 0;
}
int dos_is_bw(void)
{
unsigned char cfg;
dosmemget(0x410, sizeof cfg, &cfg);
return (cfg & 0x30) == 0x30;
}
#else
typedef int dos_c_no_empty_unit;
#endif