-
Notifications
You must be signed in to change notification settings - Fork 184
/
termbox.c
678 lines (576 loc) · 15.3 KB
/
termbox.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
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdbool.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
#include <wchar.h>
#include "termbox.h"
#include "bytebuffer.inl"
#include "term.inl"
#include "input.inl"
struct cellbuf {
int width;
int height;
struct tb_cell *cells;
};
#define CELL(buf, x, y) (buf)->cells[(y) * (buf)->width + (x)]
#define IS_CURSOR_HIDDEN(cx, cy) (cx == -1 || cy == -1)
#define LAST_COORD_INIT -1
static struct termios orig_tios;
static struct cellbuf back_buffer;
static struct cellbuf front_buffer;
static struct bytebuffer output_buffer;
static struct bytebuffer input_buffer;
static int termw = -1;
static int termh = -1;
static int inputmode = TB_INPUT_ESC;
static int outputmode = TB_OUTPUT_NORMAL;
static int inout;
static int winch_fds[2];
static int lastx = LAST_COORD_INIT;
static int lasty = LAST_COORD_INIT;
static int cursor_x = -1;
static int cursor_y = -1;
static uint16_t background = TB_DEFAULT;
static uint16_t foreground = TB_DEFAULT;
static void write_cursor(int x, int y);
static void write_sgr(uint16_t fg, uint16_t bg);
static void cellbuf_init(struct cellbuf *buf, int width, int height);
static void cellbuf_resize(struct cellbuf *buf, int width, int height);
static void cellbuf_clear(struct cellbuf *buf);
static void cellbuf_free(struct cellbuf *buf);
static void update_size(void);
static void update_term_size(void);
static void send_attr(uint16_t fg, uint16_t bg);
static void send_char(int x, int y, uint32_t c);
static void send_clear(void);
static void sigwinch_handler(int xxx);
static int wait_fill_event(struct tb_event *event, struct timeval *timeout);
/* may happen in a different thread */
static volatile int buffer_size_change_request;
/* -------------------------------------------------------- */
int tb_init_fd(int inout_)
{
inout = inout_;
if (inout == -1) {
return TB_EFAILED_TO_OPEN_TTY;
}
if (init_term() < 0) {
close(inout);
return TB_EUNSUPPORTED_TERMINAL;
}
if (pipe(winch_fds) < 0) {
close(inout);
return TB_EPIPE_TRAP_ERROR;
}
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sigwinch_handler;
sa.sa_flags = 0;
sigaction(SIGWINCH, &sa, 0);
tcgetattr(inout, &orig_tios);
struct termios tios;
memcpy(&tios, &orig_tios, sizeof(tios));
tios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
| INLCR | IGNCR | ICRNL | IXON);
tios.c_oflag &= ~OPOST;
tios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
tios.c_cflag &= ~(CSIZE | PARENB);
tios.c_cflag |= CS8;
tios.c_cc[VMIN] = 0;
tios.c_cc[VTIME] = 0;
tcsetattr(inout, TCSAFLUSH, &tios);
bytebuffer_init(&input_buffer, 128);
bytebuffer_init(&output_buffer, 32 * 1024);
bytebuffer_puts(&output_buffer, funcs[T_ENTER_CA]);
bytebuffer_puts(&output_buffer, funcs[T_ENTER_KEYPAD]);
bytebuffer_puts(&output_buffer, funcs[T_HIDE_CURSOR]);
send_clear();
update_term_size();
cellbuf_init(&back_buffer, termw, termh);
cellbuf_init(&front_buffer, termw, termh);
cellbuf_clear(&back_buffer);
cellbuf_clear(&front_buffer);
return 0;
}
int tb_init_file(const char* name){
return tb_init_fd(open(name, O_RDWR));
}
int tb_init(void)
{
return tb_init_file("/dev/tty");
}
void tb_shutdown(void)
{
if (termw == -1) {
fputs("tb_shutdown() should not be called twice.", stderr);
abort();
}
bytebuffer_puts(&output_buffer, funcs[T_SHOW_CURSOR]);
bytebuffer_puts(&output_buffer, funcs[T_SGR0]);
bytebuffer_puts(&output_buffer, funcs[T_CLEAR_SCREEN]);
bytebuffer_puts(&output_buffer, funcs[T_EXIT_CA]);
bytebuffer_puts(&output_buffer, funcs[T_EXIT_KEYPAD]);
bytebuffer_puts(&output_buffer, funcs[T_EXIT_MOUSE]);
bytebuffer_flush(&output_buffer, inout);
tcsetattr(inout, TCSAFLUSH, &orig_tios);
shutdown_term();
close(inout);
close(winch_fds[0]);
close(winch_fds[1]);
cellbuf_free(&back_buffer);
cellbuf_free(&front_buffer);
bytebuffer_free(&output_buffer);
bytebuffer_free(&input_buffer);
termw = termh = -1;
}
void tb_present(void)
{
int x,y,w,i;
struct tb_cell *back, *front;
/* invalidate cursor position */
lastx = LAST_COORD_INIT;
lasty = LAST_COORD_INIT;
if (buffer_size_change_request) {
update_size();
buffer_size_change_request = 0;
}
for (y = 0; y < front_buffer.height; ++y) {
for (x = 0; x < front_buffer.width; ) {
back = &CELL(&back_buffer, x, y);
front = &CELL(&front_buffer, x, y);
w = wcwidth(back->ch);
if (w < 1) w = 1;
if (memcmp(back, front, sizeof(struct tb_cell)) == 0) {
x += w;
continue;
}
memcpy(front, back, sizeof(struct tb_cell));
send_attr(back->fg, back->bg);
if (w > 1 && x >= front_buffer.width - (w - 1)) {
// Not enough room for wide ch, so send spaces
for (i = x; i < front_buffer.width; ++i) {
send_char(i, y, ' ');
}
} else {
send_char(x, y, back->ch);
for (i = 1; i < w; ++i) {
front = &CELL(&front_buffer, x + i, y);
front->ch = 0;
front->fg = back->fg;
front->bg = back->bg;
}
}
x += w;
}
}
if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
write_cursor(cursor_x, cursor_y);
bytebuffer_flush(&output_buffer, inout);
}
void tb_set_cursor(int cx, int cy)
{
if (IS_CURSOR_HIDDEN(cursor_x, cursor_y) && !IS_CURSOR_HIDDEN(cx, cy))
bytebuffer_puts(&output_buffer, funcs[T_SHOW_CURSOR]);
if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y) && IS_CURSOR_HIDDEN(cx, cy))
bytebuffer_puts(&output_buffer, funcs[T_HIDE_CURSOR]);
cursor_x = cx;
cursor_y = cy;
if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
write_cursor(cursor_x, cursor_y);
}
void tb_put_cell(int x, int y, const struct tb_cell *cell)
{
if ((unsigned)x >= (unsigned)back_buffer.width)
return;
if ((unsigned)y >= (unsigned)back_buffer.height)
return;
CELL(&back_buffer, x, y) = *cell;
}
void tb_change_cell(int x, int y, uint32_t ch, uint16_t fg, uint16_t bg)
{
struct tb_cell c = {ch, fg, bg};
tb_put_cell(x, y, &c);
}
void tb_blit(int x, int y, int w, int h, const struct tb_cell *cells)
{
if (x + w < 0 || x >= back_buffer.width)
return;
if (y + h < 0 || y >= back_buffer.height)
return;
int xo = 0, yo = 0, ww = w, hh = h;
if (x < 0) {
xo = -x;
ww -= xo;
x = 0;
}
if (y < 0) {
yo = -y;
hh -= yo;
y = 0;
}
if (ww > back_buffer.width - x)
ww = back_buffer.width - x;
if (hh > back_buffer.height - y)
hh = back_buffer.height - y;
int sy;
struct tb_cell *dst = &CELL(&back_buffer, x, y);
const struct tb_cell *src = cells + yo * w + xo;
size_t size = sizeof(struct tb_cell) * ww;
for (sy = 0; sy < hh; ++sy) {
memcpy(dst, src, size);
dst += back_buffer.width;
src += w;
}
}
struct tb_cell *tb_cell_buffer(void)
{
return back_buffer.cells;
}
int tb_poll_event(struct tb_event *event)
{
return wait_fill_event(event, 0);
}
int tb_peek_event(struct tb_event *event, int timeout)
{
struct timeval tv;
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout - (tv.tv_sec * 1000)) * 1000;
return wait_fill_event(event, &tv);
}
int tb_width(void)
{
return termw;
}
int tb_height(void)
{
return termh;
}
void tb_clear(void)
{
if (buffer_size_change_request) {
update_size();
buffer_size_change_request = 0;
}
cellbuf_clear(&back_buffer);
}
int tb_select_input_mode(int mode)
{
if (mode) {
if ((mode & (TB_INPUT_ESC | TB_INPUT_ALT)) == 0)
mode |= TB_INPUT_ESC;
/* technically termbox can handle that, but let's be nice and show here
what mode is actually used */
if ((mode & (TB_INPUT_ESC | TB_INPUT_ALT)) == (TB_INPUT_ESC | TB_INPUT_ALT))
mode &= ~TB_INPUT_ALT;
inputmode = mode;
if (mode&TB_INPUT_MOUSE) {
bytebuffer_puts(&output_buffer, funcs[T_ENTER_MOUSE]);
bytebuffer_flush(&output_buffer, inout);
} else {
bytebuffer_puts(&output_buffer, funcs[T_EXIT_MOUSE]);
bytebuffer_flush(&output_buffer, inout);
}
}
return inputmode;
}
int tb_select_output_mode(int mode)
{
if (mode)
outputmode = mode;
return outputmode;
}
void tb_set_clear_attributes(uint16_t fg, uint16_t bg)
{
foreground = fg;
background = bg;
}
/* -------------------------------------------------------- */
static int convertnum(uint32_t num, char* buf) {
int i, l = 0;
int ch;
do {
buf[l++] = '0' + (num % 10);
num /= 10;
} while (num);
for(i = 0; i < l / 2; i++) {
ch = buf[i];
buf[i] = buf[l - 1 - i];
buf[l - 1 - i] = ch;
}
return l;
}
#define WRITE_LITERAL(X) bytebuffer_append(&output_buffer, (X), sizeof(X)-1)
#define WRITE_INT(X) bytebuffer_append(&output_buffer, buf, convertnum((X), buf))
static void write_cursor(int x, int y) {
char buf[32];
WRITE_LITERAL("\033[");
WRITE_INT(y+1);
WRITE_LITERAL(";");
WRITE_INT(x+1);
WRITE_LITERAL("H");
}
static void write_sgr(uint16_t fg, uint16_t bg) {
char buf[32];
if (fg == TB_DEFAULT && bg == TB_DEFAULT)
return;
switch (outputmode) {
case TB_OUTPUT_256:
case TB_OUTPUT_216:
case TB_OUTPUT_GRAYSCALE:
WRITE_LITERAL("\033[");
if (fg != TB_DEFAULT) {
WRITE_LITERAL("38;5;");
WRITE_INT(fg);
if (bg != TB_DEFAULT) {
WRITE_LITERAL(";");
}
}
if (bg != TB_DEFAULT) {
WRITE_LITERAL("48;5;");
WRITE_INT(bg);
}
WRITE_LITERAL("m");
break;
case TB_OUTPUT_NORMAL:
default:
WRITE_LITERAL("\033[");
if (fg != TB_DEFAULT) {
WRITE_LITERAL("3");
WRITE_INT(fg - 1);
if (bg != TB_DEFAULT) {
WRITE_LITERAL(";");
}
}
if (bg != TB_DEFAULT) {
WRITE_LITERAL("4");
WRITE_INT(bg - 1);
}
WRITE_LITERAL("m");
break;
}
}
static void cellbuf_init(struct cellbuf *buf, int width, int height)
{
buf->cells = (struct tb_cell*)malloc(sizeof(struct tb_cell) * width * height);
assert(buf->cells);
buf->width = width;
buf->height = height;
}
static void cellbuf_resize(struct cellbuf *buf, int width, int height)
{
if (buf->width == width && buf->height == height)
return;
int oldw = buf->width;
int oldh = buf->height;
struct tb_cell *oldcells = buf->cells;
cellbuf_init(buf, width, height);
cellbuf_clear(buf);
int minw = (width < oldw) ? width : oldw;
int minh = (height < oldh) ? height : oldh;
int i;
for (i = 0; i < minh; ++i) {
struct tb_cell *csrc = oldcells + (i * oldw);
struct tb_cell *cdst = buf->cells + (i * width);
memcpy(cdst, csrc, sizeof(struct tb_cell) * minw);
}
free(oldcells);
}
static void cellbuf_clear(struct cellbuf *buf)
{
int i;
int ncells = buf->width * buf->height;
for (i = 0; i < ncells; ++i) {
buf->cells[i].ch = ' ';
buf->cells[i].fg = foreground;
buf->cells[i].bg = background;
}
}
static void cellbuf_free(struct cellbuf *buf)
{
free(buf->cells);
}
static void get_term_size(int *w, int *h)
{
struct winsize sz;
memset(&sz, 0, sizeof(sz));
ioctl(inout, TIOCGWINSZ, &sz);
if (w) *w = sz.ws_col;
if (h) *h = sz.ws_row;
}
static void update_term_size(void)
{
struct winsize sz;
memset(&sz, 0, sizeof(sz));
ioctl(inout, TIOCGWINSZ, &sz);
termw = sz.ws_col;
termh = sz.ws_row;
}
static void send_attr(uint16_t fg, uint16_t bg)
{
#define LAST_ATTR_INIT 0xFFFF
static uint16_t lastfg = LAST_ATTR_INIT, lastbg = LAST_ATTR_INIT;
if (fg != lastfg || bg != lastbg) {
bytebuffer_puts(&output_buffer, funcs[T_SGR0]);
uint16_t fgcol;
uint16_t bgcol;
switch (outputmode) {
case TB_OUTPUT_256:
fgcol = fg & 0xFF;
bgcol = bg & 0xFF;
break;
case TB_OUTPUT_216:
fgcol = fg & 0xFF; if (fgcol > 215) fgcol = 7;
bgcol = bg & 0xFF; if (bgcol > 215) bgcol = 0;
fgcol += 0x10;
bgcol += 0x10;
break;
case TB_OUTPUT_GRAYSCALE:
fgcol = fg & 0xFF; if (fgcol > 23) fgcol = 23;
bgcol = bg & 0xFF; if (bgcol > 23) bgcol = 0;
fgcol += 0xe8;
bgcol += 0xe8;
break;
case TB_OUTPUT_NORMAL:
default:
fgcol = fg & 0x0F;
bgcol = bg & 0x0F;
}
if (fg & TB_BOLD)
bytebuffer_puts(&output_buffer, funcs[T_BOLD]);
if (bg & TB_BOLD)
bytebuffer_puts(&output_buffer, funcs[T_BLINK]);
if (fg & TB_UNDERLINE)
bytebuffer_puts(&output_buffer, funcs[T_UNDERLINE]);
if ((fg & TB_REVERSE) || (bg & TB_REVERSE))
bytebuffer_puts(&output_buffer, funcs[T_REVERSE]);
write_sgr(fgcol, bgcol);
lastfg = fg;
lastbg = bg;
}
}
static void send_char(int x, int y, uint32_t c)
{
char buf[7];
int bw = tb_utf8_unicode_to_char(buf, c);
if (x-1 != lastx || y != lasty)
write_cursor(x, y);
lastx = x; lasty = y;
if(!c) buf[0] = ' '; // replace 0 with whitespace
bytebuffer_append(&output_buffer, buf, bw);
}
static void send_clear(void)
{
send_attr(foreground, background);
bytebuffer_puts(&output_buffer, funcs[T_CLEAR_SCREEN]);
if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
write_cursor(cursor_x, cursor_y);
bytebuffer_flush(&output_buffer, inout);
/* we need to invalidate cursor position too and these two vars are
* used only for simple cursor positioning optimization, cursor
* actually may be in the correct place, but we simply discard
* optimization once and it gives us simple solution for the case when
* cursor moved */
lastx = LAST_COORD_INIT;
lasty = LAST_COORD_INIT;
}
static void sigwinch_handler(int xxx)
{
(void) xxx;
const int zzz = 1;
write(winch_fds[1], &zzz, sizeof(int));
}
static void update_size(void)
{
update_term_size();
cellbuf_resize(&back_buffer, termw, termh);
cellbuf_resize(&front_buffer, termw, termh);
cellbuf_clear(&front_buffer);
send_clear();
}
static int read_up_to(int n) {
assert(n > 0);
const int prevlen = input_buffer.len;
bytebuffer_resize(&input_buffer, prevlen + n);
int read_n = 0;
while (read_n <= n) {
ssize_t r = 0;
if (read_n < n) {
r = read(inout, input_buffer.buf + prevlen + read_n, n - read_n);
}
#ifdef __CYGWIN__
// While linux man for tty says when VMIN == 0 && VTIME == 0, read
// should return 0 when there is nothing to read, cygwin's read returns
// -1. Not sure why and if it's correct to ignore it, but let's pretend
// it's zero.
if (r < 0) r = 0;
#endif
if (r < 0) {
// EAGAIN / EWOULDBLOCK shouldn't occur here
assert(errno != EAGAIN && errno != EWOULDBLOCK);
return -1;
} else if (r > 0) {
read_n += r;
} else {
bytebuffer_resize(&input_buffer, prevlen + read_n);
return read_n;
}
}
assert(!"unreachable");
return 0;
}
static int wait_fill_event(struct tb_event *event, struct timeval *timeout)
{
// ;-)
#define ENOUGH_DATA_FOR_PARSING 64
fd_set events;
memset(event, 0, sizeof(struct tb_event));
// try to extract event from input buffer, return on success
event->type = TB_EVENT_KEY;
if (extract_event(event, &input_buffer, inputmode))
return event->type;
// it looks like input buffer is incomplete, let's try the short path,
// but first make sure there is enough space
int n = read_up_to(ENOUGH_DATA_FOR_PARSING);
if (n < 0)
return -1;
if (n > 0 && extract_event(event, &input_buffer, inputmode))
return event->type;
// n == 0, or not enough data, let's go to select
while (1) {
FD_ZERO(&events);
FD_SET(inout, &events);
FD_SET(winch_fds[0], &events);
int maxfd = (winch_fds[0] > inout) ? winch_fds[0] : inout;
int result = select(maxfd+1, &events, 0, 0, timeout);
if (!result)
return 0;
if (FD_ISSET(inout, &events)) {
event->type = TB_EVENT_KEY;
n = read_up_to(ENOUGH_DATA_FOR_PARSING);
if (n < 0)
return -1;
if (n == 0)
continue;
if (extract_event(event, &input_buffer, inputmode))
return event->type;
}
if (FD_ISSET(winch_fds[0], &events)) {
event->type = TB_EVENT_RESIZE;
int zzz = 0;
read(winch_fds[0], &zzz, sizeof(int));
buffer_size_change_request = 1;
get_term_size(&event->w, &event->h);
return TB_EVENT_RESIZE;
}
}
}