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version 0.1
[sfm.git] / termbox.c
blob07bdb3b8e44cf4369b6b72402ca411b2c64d93b7
1 #if defined(__linux__)
2 #define _GNU_SOURCE
3 #elif defined(__APPLE__)
4 #define _DARWIN_C_SOURCE
5 #elif defined(__FreeBSD__)
6 #define __BSD_VISIBLE 1
7 #endif
8 #include "termbox.h"
9
10 #include <sys/ioctl.h>
11 #include <sys/select.h>
12 #include <sys/stat.h>
13 #include <sys/time.h>
14
15 #include <assert.h>
16 #include <errno.h>
17 #include <fcntl.h>
18 #include <signal.h>
19 #include <stdbool.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <termios.h>
24 #include <unistd.h>
25 #include <wchar.h>
26
27 static int inputmode = TB_INPUT_ESC;
28
29 /* bytebuffer.inl --------------------------------------------------------- */
30
31 struct bytebuffer {
32 char *buf;
33 int len;
34 int cap;
35 };
36
37 static void
38 bytebuffer_reserve(struct bytebuffer *b, int cap)
39 {
40 if (b->cap >= cap) {
41 return;
42 }
43
44 // prefer doubling capacity
45 if (b->cap * 2 >= cap) {
46 cap = b->cap * 2;
47 }
48
49 char *newbuf = realloc(b->buf, cap);
50 b->buf = newbuf;
51 b->cap = cap;
52 }
53
54 static void
55 bytebuffer_init(struct bytebuffer *b, int cap)
56 {
57 b->cap = 0;
58 b->len = 0;
59 b->buf = 0;
60
61 if (cap > 0) {
62 b->cap = cap;
63 b->buf = malloc(cap); // just assume malloc works always
64 }
65 }
66
67 static void
68 bytebuffer_free(struct bytebuffer *b)
69 {
70 if (b->buf)
71 free(b->buf);
72 }
73
74 static void
75 bytebuffer_clear(struct bytebuffer *b)
76 {
77 b->len = 0;
78 }
79
80 static void
81 bytebuffer_append(struct bytebuffer *b, const char *data, int len)
82 {
83 bytebuffer_reserve(b, b->len + len);
84 memcpy(b->buf + b->len, data, len);
85 b->len += len;
86 }
87
88 static void
89 bytebuffer_puts(struct bytebuffer *b, const char *str)
90 {
91 bytebuffer_append(b, str, strlen(str));
92 }
93
94 static void
95 bytebuffer_resize(struct bytebuffer *b, int len)
96 {
97 bytebuffer_reserve(b, len);
98 b->len = len;
99 }
100
101 static void
102 bytebuffer_flush(struct bytebuffer *b, int fd)
103 {
104 (void)write(fd, b->buf, b->len);
105 bytebuffer_clear(b);
106 }
107
108 static void
109 bytebuffer_truncate(struct bytebuffer *b, int n)
110 {
111 if (n <= 0)
112 return;
113 if (n > b->len)
114 n = b->len;
115 const int nmove = b->len - n;
116 memmove(b->buf, b->buf + n, nmove);
117 b->len -= n;
118 }
119
120 /* term.inl --------------------------------------------------------------- */
121 enum {
122 T_ENTER_CA,
123 T_EXIT_CA,
124 T_SHOW_CURSOR,
125 T_HIDE_CURSOR,
126 T_CLEAR_SCREEN,
127 T_SGR0,
128 T_UNDERLINE,
129 T_BOLD,
130 T_BLINK,
131 T_REVERSE,
132 T_ENTER_KEYPAD,
133 T_EXIT_KEYPAD,
134 T_ENTER_MOUSE,
135 T_EXIT_MOUSE,
136 T_FUNCS_NUM,
137 };
138
139 #define ENTER_MOUSE_SEQ "\x1b[?1000h\x1b[?1002h\x1b[?1015h\x1b[?1006h"
140 #define EXIT_MOUSE_SEQ "\x1b[?1006l\x1b[?1015l\x1b[?1002l\x1b[?1000l"
141
142 #define EUNSUPPORTED_TERM -1
143
144 // rxvt-256color
145 static const char *rxvt_256color_keys[] = { "\033[11~", "\033[12~", "\033[13~",
146 "\033[14~", "\033[15~", "\033[17~", "\033[18~", "\033[19~", "\033[20~",
147 "\033[21~", "\033[23~", "\033[24~", "\033[2~", "\033[3~", "\033[7~",
148 "\033[8~", "\033[5~", "\033[6~", "\033[A", "\033[B", "\033[D", "\033[C",
149 0 };
150 static const char *rxvt_256color_funcs[] = {
151 "\0337\033[?47h",
152 "\033[2J\033[?47l\0338",
153 "\033[?25h",
154 "\033[?25l",
155 "\033[H\033[2J",
156 "\033[m",
157 "\033[4m",
158 "\033[1m",
159 "\033[5m",
160 "\033[7m",
161 "\033=",
162 "\033>",
163 ENTER_MOUSE_SEQ,
164 EXIT_MOUSE_SEQ,
165 };
166
167 // Eterm
168 static const char *eterm_keys[] = { "\033[11~", "\033[12~", "\033[13~",
169 "\033[14~", "\033[15~", "\033[17~", "\033[18~", "\033[19~", "\033[20~",
170 "\033[21~", "\033[23~", "\033[24~", "\033[2~", "\033[3~", "\033[7~",
171 "\033[8~", "\033[5~", "\033[6~", "\033[A", "\033[B", "\033[D", "\033[C",
172 0 };
173 static const char *eterm_funcs[] = {
174 "\0337\033[?47h",
175 "\033[2J\033[?47l\0338",
176 "\033[?25h",
177 "\033[?25l",
178 "\033[H\033[2J",
179 "\033[m",
180 "\033[4m",
181 "\033[1m",
182 "\033[5m",
183 "\033[7m",
184 "",
185 "",
186 "",
187 "",
188 };
189
190 // screen
191 static const char *screen_keys[] = { "\033OP", "\033OQ", "\033OR", "\033OS",
192 "\033[15~", "\033[17~", "\033[18~", "\033[19~", "\033[20~", "\033[21~",
193 "\033[23~", "\033[24~", "\033[2~", "\033[3~", "\033[1~", "\033[4~",
194 "\033[5~", "\033[6~", "\033OA", "\033OB", "\033OD", "\033OC", 0 };
195 static const char *screen_funcs[] = {
196 "\033[?1049h",
197 "\033[?1049l",
198 "\033[34h\033[?25h",
199 "\033[?25l",
200 "\033[H\033[J",
201 "\033[m",
202 "\033[4m",
203 "\033[1m",
204 "\033[5m",
205 "\033[7m",
206 "\033[?1h\033=",
207 "\033[?1l\033>",
208 ENTER_MOUSE_SEQ,
209 EXIT_MOUSE_SEQ,
210 };
211
212 // rxvt-unicode
213 static const char *rxvt_unicode_keys[] = { "\033[11~", "\033[12~", "\033[13~",
214 "\033[14~", "\033[15~", "\033[17~", "\033[18~", "\033[19~", "\033[20~",
215 "\033[21~", "\033[23~", "\033[24~", "\033[2~", "\033[3~", "\033[7~",
216 "\033[8~", "\033[5~", "\033[6~", "\033[A", "\033[B", "\033[D", "\033[C",
217 0 };
218 static const char *rxvt_unicode_funcs[] = {
219 "\033[?1049h",
220 "\033[r\033[?1049l",
221 "\033[?25h",
222 "\033[?25l",
223 "\033[H\033[2J",
224 "\033[m\033(B",
225 "\033[4m",
226 "\033[1m",
227 "\033[5m",
228 "\033[7m",
229 "\033=",
230 "\033>",
231 ENTER_MOUSE_SEQ,
232 EXIT_MOUSE_SEQ,
233 };
234
235 // linux
236 static const char *linux_keys[] = { "\033[[A", "\033[[B", "\033[[C", "\033[[D",
237 "\033[[E", "\033[17~", "\033[18~", "\033[19~", "\033[20~", "\033[21~",
238 "\033[23~", "\033[24~", "\033[2~", "\033[3~", "\033[1~", "\033[4~",
239 "\033[5~", "\033[6~", "\033[A", "\033[B", "\033[D", "\033[C", 0 };
240 static const char *linux_funcs[] = {
241 "",
242 "",
243 "\033[?25h\033[?0c",
244 "\033[?25l\033[?1c",
245 "\033[H\033[J",
246 "\033[0;10m",
247 "\033[4m",
248 "\033[1m",
249 "\033[5m",
250 "\033[7m",
251 "",
252 "",
253 "",
254 "",
255 };
256
257 // xterm
258 static const char *xterm_keys[] = { "\033OP", "\033OQ", "\033OR", "\033OS",
259 "\033[15~", "\033[17~", "\033[18~", "\033[19~", "\033[20~", "\033[21~",
260 "\033[23~", "\033[24~", "\033[2~", "\033[3~", "\033OH", "\033OF",
261 "\033[5~", "\033[6~", "\033OA", "\033OB", "\033OD", "\033OC", 0 };
262 static const char *xterm_funcs[] = {
263 "\033[?1049h",
264 "\033[?1049l",
265 "\033[?12l\033[?25h",
266 "\033[?25l",
267 "\033[H\033[2J",
268 "\033(B\033[m",
269 "\033[4m",
270 "\033[1m",
271 "\033[5m",
272 "\033[7m",
273 "\033[?1h\033=",
274 "\033[?1l\033>",
275 ENTER_MOUSE_SEQ,
276 EXIT_MOUSE_SEQ,
277 };
278
279 static struct term {
280 const char *name;
281 const char **keys;
282 const char **funcs;
283 } terms[] = {
284 { "rxvt-256color", rxvt_256color_keys, rxvt_256color_funcs },
285 { "Eterm", eterm_keys, eterm_funcs },
286 { "screen", screen_keys, screen_funcs },
287 { "rxvt-unicode", rxvt_unicode_keys, rxvt_unicode_funcs },
288 { "linux", linux_keys, linux_funcs },
289 { "xterm", xterm_keys, xterm_funcs },
290 { 0, 0, 0 },
291 };
292
293 static bool init_from_terminfo = false;
294 static const char **keys;
295 static const char **funcs;
296
297 static int
298 try_compatible(const char *term, const char *name, const char **tkeys,
299 const char **tfuncs)
300 {
301 if (strstr(term, name)) {
302 keys = tkeys;
303 funcs = tfuncs;
304 return 0;
305 }
306
307 return EUNSUPPORTED_TERM;
308 }
309
310 static int
311 init_term_builtin(void)
312 {
313 int i;
314 const char *term = getenv("TERM");
315
316 if (term) {
317 for (i = 0; terms[i].name; i++) {
318 if (!strcmp(terms[i].name, term)) {
319 keys = terms[i].keys;
320 funcs = terms[i].funcs;
321 return 0;
322 }
323 }
324
325 /* let's do some heuristic, maybe it's a compatible terminal */
326 if (try_compatible(term, "xterm", xterm_keys, xterm_funcs) == 0)
327 return 0;
328 if (try_compatible(term, "rxvt", rxvt_unicode_keys,
329 rxvt_unicode_funcs) == 0)
330 return 0;
331 if (try_compatible(term, "linux", linux_keys, linux_funcs) == 0)
332 return 0;
333 if (try_compatible(term, "Eterm", eterm_keys, eterm_funcs) == 0)
334 return 0;
335 if (try_compatible(term, "screen", screen_keys, screen_funcs) ==
336 0)
337 return 0;
338 if (try_compatible(term, "tmux", screen_keys, screen_funcs) ==
339 0)
340 return 0;
341 /* let's assume that 'cygwin' is xterm compatible */
342 if (try_compatible(term, "cygwin", xterm_keys, xterm_funcs) ==
343 0)
344 return 0;
345 }
346
347 return EUNSUPPORTED_TERM;
348 }
349
350 //----------------------------------------------------------------------
351 // terminfo
352 //----------------------------------------------------------------------
353
354 static char *
355 read_file(const char *file)
356 {
357 FILE *f = fopen(file, "rb");
358 if (!f)
359 return 0;
360
361 struct stat st;
362 if (fstat(fileno(f), &st) != 0) {
363 fclose(f);
364 return 0;
365 }
366
367 char *data = malloc(st.st_size);
368 if (!data) {
369 fclose(f);
370 return 0;
371 }
372
373 if (fread(data, 1, st.st_size, f) != (size_t)st.st_size) {
374 fclose(f);
375 free(data);
376 return 0;
377 }
378
379 fclose(f);
380 return data;
381 }
382
383 static char *
384 terminfo_try_path(const char *path, const char *term)
385 {
386 char tmp[4096];
387 snprintf(tmp, sizeof(tmp), "%s/%c/%s", path, term[0], term);
388 tmp[sizeof(tmp) - 1] = '\0';
389 char *data = read_file(tmp);
390 if (data) {
391 return data;
392 }
393
394 // fallback to darwin specific dirs structure
395 snprintf(tmp, sizeof(tmp), "%s/%x/%s", path, term[0], term);
396 tmp[sizeof(tmp) - 1] = '\0';
397 return read_file(tmp);
398 }
399
400 static char *
401 load_terminfo(void)
402 {
403 char tmp[4096];
404 const char *term = getenv("TERM");
405 if (!term) {
406 return 0;
407 }
408
409 // if TERMINFO is set, no other directory should be searched
410 const char *terminfo = getenv("TERMINFO");
411 if (terminfo) {
412 return terminfo_try_path(terminfo, term);
413 }
414
415 // next, consider ~/.terminfo
416 const char *home = getenv("HOME");
417 if (home) {
418 snprintf(tmp, sizeof(tmp), "%s/.terminfo", home);
419 tmp[sizeof(tmp) - 1] = '\0';
420 char *data = terminfo_try_path(tmp, term);
421 if (data)
422 return data;
423 }
424
425 // next, TERMINFO_DIRS
426 const char *dirs = getenv("TERMINFO_DIRS");
427 if (dirs) {
428 snprintf(tmp, sizeof(tmp), "%s", dirs);
429 tmp[sizeof(tmp) - 1] = '\0';
430 char *dir = strtok(tmp, ":");
431 while (dir) {
432 const char *cdir = dir;
433 if (strcmp(cdir, "") == 0) {
434 cdir = "/usr/share/terminfo";
435 }
436 char *data = terminfo_try_path(cdir, term);
437 if (data)
438 return data;
439 dir = strtok(0, ":");
440 }
441 }
442
443 // fallback to /usr/share/terminfo
444 return terminfo_try_path("/usr/share/terminfo", term);
445 }
446
447 #define TI_MAGIC 0432
448 #define TI_ALT_MAGIC 542
449 #define TI_HEADER_LENGTH 12
450 #define TB_KEYS_NUM 22
451
452 static const char *
453 terminfo_copy_string(char *data, int str, int table)
454 {
455 const int16_t off = *(int16_t *)(data + str);
456 const char *src = data + table + off;
457 int len = strlen(src);
458 char *dst = malloc(len + 1);
459 strcpy(dst, src);
460 return dst;
461 }
462
463 static const int16_t ti_funcs[] = {
464 28,
465 40,
466 16,
467 13,
468 5,
469 39,
470 36,
471 27,
472 26,
473 34,
474 89,
475 88,
476 };
477
478 static const int16_t ti_keys[] = {
479 66,
480 68 /* apparently not a typo; 67 is F10 for whatever reason */,
481 69,
482 70,
483 71,
484 72,
485 73,
486 74,
487 75,
488 67,
489 216,
490 217,
491 77,
492 59,
493 76,
494 164,
495 82,
496 81,
497 87,
498 61,
499 79,
500 83,
501 };
502
503 static int
504 init_term(void)
505 {
506 int i;
507 char *data = load_terminfo();
508 if (!data) {
509 init_from_terminfo = false;
510 return init_term_builtin();
511 }
512
513 int16_t *header = (int16_t *)data;
514
515 const int number_sec_len = header[0] == TI_ALT_MAGIC ? 4 : 2;
516
517 if ((header[1] + header[2]) % 2) {
518 // old quirk to align everything on word boundaries
519 header[2] += 1;
520 }
521
522 const int str_offset = TI_HEADER_LENGTH + header[1] + header[2] +
523 number_sec_len * header[3];
524 const int table_offset = str_offset + 2 * header[4];
525
526 keys = malloc(sizeof(const char *) * (TB_KEYS_NUM + 1));
527 for (i = 0; i < TB_KEYS_NUM; i++) {
528 keys[i] = terminfo_copy_string(
529 data, str_offset + 2 * ti_keys[i], table_offset);
530 }
531 keys[TB_KEYS_NUM] = 0;
532
533 funcs = malloc(sizeof(const char *) * T_FUNCS_NUM);
534 // the last two entries are reserved for mouse. because the table offset is
535 // not there, the two entries have to fill in manually
536 for (i = 0; i < T_FUNCS_NUM - 2; i++) {
537 funcs[i] = terminfo_copy_string(
538 data, str_offset + 2 * ti_funcs[i], table_offset);
539 }
540
541 funcs[T_FUNCS_NUM - 2] = ENTER_MOUSE_SEQ;
542 funcs[T_FUNCS_NUM - 1] = EXIT_MOUSE_SEQ;
543
544 init_from_terminfo = true;
545 free(data);
546 return 0;
547 }
548
549 static void
550 shutdown_term(void)
551 {
552 if (init_from_terminfo) {
553 int i;
554 for (i = 0; i < TB_KEYS_NUM; i++) {
555 free((void *)keys[i]);
556 }
557 // the last two entries are reserved for mouse. because the table offset
558 // is not there, the two entries have to fill in manually and do not
559 // need to be freed.
560 for (i = 0; i < T_FUNCS_NUM - 2; i++) {
561 free((void *)funcs[i]);
562 }
563 free(keys);
564 free(funcs);
565 }
566 }
567
568 /* input.inl -------------------------------------------------------------- */
569
570 // if s1 starts with s2 returns true, else false
571 // len is the length of s1
572 // s2 should be null-terminated
573 static bool
574 starts_with(const char *s1, int len, const char *s2)
575 {
576 int n = 0;
577 while (*s2 && n < len) {
578 if (*s1++ != *s2++)
579 return false;
580 n++;
581 }
582 return *s2 == 0;
583 }
584
585 // convert escape sequence to event, and return consumed bytes on success (failure == 0)
586 static int
587 parse_escape_seq(struct tb_event *event, const char *buf, int len)
588 {
589 // it's pretty simple here, find 'starts_with' match and return
590 // success, else return failure
591 int i;
592 for (i = 0; keys[i]; i++) {
593 if (starts_with(buf, len, keys[i])) {
594 event->ch = 0;
595 event->key = 0xFFFF - i;
596 return strlen(keys[i]);
597 }
598 }
599 return 0;
600 }
601
602 static bool
603 extract_event(struct tb_event *event, struct bytebuffer *inbuf)
604 {
605 const char *buf = inbuf->buf;
606 const int len = inbuf->len;
607 if (len == 0)
608 return false;
609
610 if (buf[0] == '\033') {
611 int n = parse_escape_seq(event, buf, len);
612 if (n != 0) {
613 bool success = true;
614 if (n < 0) {
615 success = false;
616 n = -n;
617 }
618 bytebuffer_truncate(inbuf, n);
619 return success;
620 } else {
621 // it's not escape sequence, then it's ALT or ESC,
622 // check inputmode
623 if (inputmode & TB_INPUT_ESC) {
624 // if we're in escape mode, fill ESC event, pop
625 // buffer, return success
626 event->ch = 0;
627 event->key = TB_KEY_ESC;
628 event->mod = 0;
629 bytebuffer_truncate(inbuf, 1);
630 return true;
631 } else if (inputmode & TB_INPUT_ALT) {
632 // if we're in alt mode, set ALT modifier to
633 // event and redo parsing
634 event->mod = TB_MOD_ALT;
635 bytebuffer_truncate(inbuf, 1);
636 return extract_event(event, inbuf);
637 }
638 assert(!"never got here");
639 }
640 }
641
642 // if we're here, this is not an escape sequence and not an alt sequence
643 // so, it's a FUNCTIONAL KEY or a UNICODE character
644
645 // first of all check if it's a functional key
646 if ((unsigned char)buf[0] <= TB_KEY_SPACE ||
647 (unsigned char)buf[0] == TB_KEY_BACKSPACE2) {
648 // fill event, pop buffer, return success */
649 event->ch = 0;
650 event->key = (uint16_t)buf[0];
651 bytebuffer_truncate(inbuf, 1);
652 return true;
653 }
654
655 // feh... we got utf8 here
656
657 // check if there is all bytes
658 if (len >= tb_utf8_char_length(buf[0])) {
659 /* everything ok, fill event, pop buffer, return success */
660 tb_utf8_char_to_unicode(&event->ch, buf);
661 event->key = 0;
662 bytebuffer_truncate(inbuf, tb_utf8_char_length(buf[0]));
663 return true;
664 }
665
666 // event isn't recognized, perhaps there is not enough bytes in utf8
667 // sequence
668 return false;
669 }
670
671 /* -------------------------------------------------------- */
672
673 struct cellbuf {
674 int width;
675 int height;
676 struct tb_cell *cells;
677 };
678
679 #define CELL(buf, x, y) (buf)->cells[(y) * (buf)->width + (x)]
680 #define IS_CURSOR_HIDDEN(cx, cy) (cx == -1 || cy == -1)
681 #define LAST_COORD_INIT -1
682
683 static struct termios orig_tios;
684
685 static struct cellbuf back_buffer;
686 static struct cellbuf front_buffer;
687 static struct bytebuffer output_buffer;
688 static struct bytebuffer input_buffer;
689
690 static int termw = -1;
691 static int termh = -1;
692
693 static int outputmode = TB_OUTPUT_NORMAL;
694
695 static int inout;
696 static int winch_fds[2];
697
698 static int lastx = LAST_COORD_INIT;
699 static int lasty = LAST_COORD_INIT;
700 static int cursor_x = -1;
701 static int cursor_y = -1;
702
703 static uint16_t background = TB_DEFAULT;
704 static uint16_t foreground = TB_DEFAULT;
705
706 static void write_cursor(int x, int y);
707 static void write_sgr(uint16_t fg, uint16_t bg);
708
709 static void cellbuf_init(struct cellbuf *buf, int width, int height);
710 static void cellbuf_resize(struct cellbuf *buf, int width, int height);
711 static void cellbuf_clear(struct cellbuf *buf);
712 static void cellbuf_free(struct cellbuf *buf);
713
714 static void update_size(void);
715 static void update_term_size(void);
716 static void send_attr(uint16_t fg, uint16_t bg);
717 static void send_char(int x, int y, uint32_t c);
718 static void send_clear(void);
719 static void sigwinch_handler(int xxx);
720 static int wait_fill_event(struct tb_event *event, struct timeval *timeout);
721
722 /* may happen in a different thread */
723 static volatile int buffer_size_change_request;
724
725 /* -------------------------------------------------------- */
726
727 int
728 tb_init_fd(int inout_)
729 {
730 inout = inout_;
731 if (inout == -1) {
732 return TB_EFAILED_TO_OPEN_TTY;
733 }
734
735 if (init_term() < 0) {
736 close(inout);
737 return TB_EUNSUPPORTED_TERMINAL;
738 }
739
740 if (pipe(winch_fds) < 0) {
741 close(inout);
742 return TB_EPIPE_TRAP_ERROR;
743 }
744
745 struct sigaction sa;
746 memset(&sa, 0, sizeof(sa));
747 sa.sa_handler = sigwinch_handler;
748 sa.sa_flags = 0;
749 sigaction(SIGWINCH, &sa, 0);
750
751 tcgetattr(inout, &orig_tios);
752
753 struct termios tios;
754 memcpy(&tios, &orig_tios, sizeof(tios));
755
756 tios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR |
757 ICRNL | IXON);
758 tios.c_oflag &= ~OPOST;
759 tios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
760 tios.c_cflag &= ~(CSIZE | PARENB);
761 tios.c_cflag |= CS8;
762 tios.c_cc[VMIN] = 0;
763 tios.c_cc[VTIME] = 0;
764 tcsetattr(inout, TCSAFLUSH, &tios);
765
766 bytebuffer_init(&input_buffer, 128);
767 bytebuffer_init(&output_buffer, 32 * 1024);
768
769 bytebuffer_puts(&output_buffer, funcs[T_ENTER_CA]);
770 bytebuffer_puts(&output_buffer, funcs[T_ENTER_KEYPAD]);
771 bytebuffer_puts(&output_buffer, funcs[T_HIDE_CURSOR]);
772 send_clear();
773
774 update_term_size();
775 cellbuf_init(&back_buffer, termw, termh);
776 cellbuf_init(&front_buffer, termw, termh);
777 cellbuf_clear(&back_buffer);
778 cellbuf_clear(&front_buffer);
779
780 return 0;
781 }
782
783 int
784 tb_init_file(const char *name)
785 {
786 return tb_init_fd(open(name, O_RDWR));
787 }
788
789 int
790 tb_init(void)
791 {
792 return tb_init_file("/dev/tty");
793 }
794
795 void
796 tb_shutdown(void)
797 {
798 if (termw == -1) {
799 fputs("tb_shutdown() should not be called twice.", stderr);
800 abort();
801 }
802
803 bytebuffer_puts(&output_buffer, funcs[T_SHOW_CURSOR]);
804 bytebuffer_puts(&output_buffer, funcs[T_SGR0]);
805 bytebuffer_puts(&output_buffer, funcs[T_CLEAR_SCREEN]);
806 bytebuffer_puts(&output_buffer, funcs[T_EXIT_CA]);
807 bytebuffer_puts(&output_buffer, funcs[T_EXIT_KEYPAD]);
808 bytebuffer_puts(&output_buffer, funcs[T_EXIT_MOUSE]);
809 bytebuffer_flush(&output_buffer, inout);
810 tcsetattr(inout, TCSAFLUSH, &orig_tios);
811
812 shutdown_term();
813 close(inout);
814 close(winch_fds[0]);
815 close(winch_fds[1]);
816
817 cellbuf_free(&back_buffer);
818 cellbuf_free(&front_buffer);
819 bytebuffer_free(&output_buffer);
820 bytebuffer_free(&input_buffer);
821 termw = termh = -1;
822 }
823
824 void
825 tb_present(void)
826 {
827 int x, y, w, i;
828 struct tb_cell *back, *front;
829
830 /* invalidate cursor position */
831 lastx = LAST_COORD_INIT;
832 lasty = LAST_COORD_INIT;
833
834 if (buffer_size_change_request) {
835 update_size();
836 buffer_size_change_request = 0;
837 }
838
839 for (y = 0; y < front_buffer.height; ++y) {
840 for (x = 0; x < front_buffer.width;) {
841 back = &CELL(&back_buffer, x, y);
842 front = &CELL(&front_buffer, x, y);
843 w = wcwidth(back->ch);
844 if (w < 1)
845 w = 1;
846 if (memcmp(back, front, sizeof(struct tb_cell)) == 0) {
847 x += w;
848 continue;
849 }
850 memcpy(front, back, sizeof(struct tb_cell));
851 send_attr(back->fg, back->bg);
852 if (w > 1 && x >= front_buffer.width - (w - 1)) {
853 // Not enough room for wide ch, so send spaces
854 for (i = x; i < front_buffer.width; ++i) {
855 send_char(i, y, ' ');
856 }
857 } else {
858 send_char(x, y, back->ch);
859 for (i = 1; i < w; ++i) {
860 front = &CELL(&front_buffer, x + i, y);
861 front->ch = 0;
862 front->fg = back->fg;
863 front->bg = back->bg;
864 }
865 }
866 x += w;
867 }
868 }
869 if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
870 write_cursor(cursor_x, cursor_y);
871 bytebuffer_flush(&output_buffer, inout);
872 }
873
874 void
875 tb_set_cursor(int cx, int cy)
876 {
877 if (IS_CURSOR_HIDDEN(cursor_x, cursor_y) && !IS_CURSOR_HIDDEN(cx, cy))
878 bytebuffer_puts(&output_buffer, funcs[T_SHOW_CURSOR]);
879
880 if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y) && IS_CURSOR_HIDDEN(cx, cy))
881 bytebuffer_puts(&output_buffer, funcs[T_HIDE_CURSOR]);
882
883 cursor_x = cx;
884 cursor_y = cy;
885 if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
886 write_cursor(cursor_x, cursor_y);
887 }
888
889 void
890 tb_put_cell(int x, int y, const struct tb_cell *cell)
891 {
892 if ((unsigned)x >= (unsigned)back_buffer.width)
893 return;
894 if ((unsigned)y >= (unsigned)back_buffer.height)
895 return;
896 CELL(&back_buffer, x, y) = *cell;
897 }
898
899 void
900 tb_change_cell(int x, int y, uint32_t ch, uint16_t fg, uint16_t bg)
901 {
902 struct tb_cell c = { ch, fg, bg };
903 tb_put_cell(x, y, &c);
904 }
905
906 void
907 tb_blit(int x, int y, int w, int h, const struct tb_cell *cells)
908 {
909 if (x + w < 0 || x >= back_buffer.width)
910 return;
911 if (y + h < 0 || y >= back_buffer.height)
912 return;
913 int xo = 0, yo = 0, ww = w, hh = h;
914 if (x < 0) {
915 xo = -x;
916 ww -= xo;
917 x = 0;
918 }
919 if (y < 0) {
920 yo = -y;
921 hh -= yo;
922 y = 0;
923 }
924 if (ww > back_buffer.width - x)
925 ww = back_buffer.width - x;
926 if (hh > back_buffer.height - y)
927 hh = back_buffer.height - y;
928
929 int sy;
930 struct tb_cell *dst = &CELL(&back_buffer, x, y);
931 const struct tb_cell *src = cells + yo * w + xo;
932 size_t size = sizeof(struct tb_cell) * ww;
933
934 for (sy = 0; sy < hh; ++sy) {
935 memcpy(dst, src, size);
936 dst += back_buffer.width;
937 src += w;
938 }
939 }
940
941 struct tb_cell *
942 tb_cell_buffer(void)
943 {
944 return back_buffer.cells;
945 }
946
947 int
948 tb_poll_event(struct tb_event *event)
949 {
950 return wait_fill_event(event, 0);
951 }
952
953 int
954 tb_peek_event(struct tb_event *event, int timeout)
955 {
956 struct timeval tv;
957 tv.tv_sec = timeout / 1000;
958 tv.tv_usec = (timeout - (tv.tv_sec * 1000)) * 1000;
959 return wait_fill_event(event, &tv);
960 }
961
962 int
963 tb_width(void)
964 {
965 return termw;
966 }
967
968 int
969 tb_height(void)
970 {
971 return termh;
972 }
973
974 void
975 tb_clear(void)
976 {
977 if (buffer_size_change_request) {
978 update_size();
979 buffer_size_change_request = 0;
980 }
981 cellbuf_clear(&back_buffer);
982 }
983
984 int
985 tb_select_input_mode(int mode)
986 {
987 if (mode) {
988 if ((mode & (TB_INPUT_ESC | TB_INPUT_ALT)) == 0)
989 mode |= TB_INPUT_ESC;
990
991 /* technically termbox can handle that, but let's be nice and show here
992 what mode is actually used */
993 if ((mode & (TB_INPUT_ESC | TB_INPUT_ALT)) ==
994 (TB_INPUT_ESC | TB_INPUT_ALT))
995 mode &= ~TB_INPUT_ALT;
996
997 inputmode = mode;
998 if (mode & TB_INPUT_MOUSE) {
999 bytebuffer_puts(&output_buffer, funcs[T_ENTER_MOUSE]);
1000 bytebuffer_flush(&output_buffer, inout);
1001 } else {
1002 bytebuffer_puts(&output_buffer, funcs[T_EXIT_MOUSE]);
1003 bytebuffer_flush(&output_buffer, inout);
1004 }
1005 }
1006 return inputmode;
1007 }
1008
1009 int
1010 tb_select_output_mode(int mode)
1011 {
1012 if (mode)
1013 outputmode = mode;
1014 return outputmode;
1015 }
1016
1017 void
1018 tb_set_clear_attributes(uint16_t fg, uint16_t bg)
1019 {
1020 foreground = fg;
1021 background = bg;
1022 }
1023
1024 /* -------------------------------------------------------- */
1025
1026 static int
1027 convertnum(uint32_t num, char *buf)
1028 {
1029 int i, l = 0;
1030 int ch;
1031 do {
1032 buf[l++] = '0' + (num % 10);
1033 num /= 10;
1034 } while (num);
1035 for (i = 0; i < l / 2; i++) {
1036 ch = buf[i];
1037 buf[i] = buf[l - 1 - i];
1038 buf[l - 1 - i] = ch;
1039 }
1040 return l;
1041 }
1042
1043 #define WRITE_LITERAL(X) bytebuffer_append(&output_buffer, (X), sizeof(X) - 1)
1044 #define WRITE_INT(X) \
1045 bytebuffer_append(&output_buffer, buf, convertnum((X), buf))
1046
1047 static void
1048 write_cursor(int x, int y)
1049 {
1050 char buf[32];
1051 WRITE_LITERAL("\033[");
1052 WRITE_INT(y + 1);
1053 WRITE_LITERAL(";");
1054 WRITE_INT(x + 1);
1055 WRITE_LITERAL("H");
1056 }
1057
1058 static void
1059 write_sgr(uint16_t fg, uint16_t bg)
1060 {
1061 char buf[32];
1062
1063 if (fg == TB_DEFAULT && bg == TB_DEFAULT)
1064 return;
1065
1066 switch (outputmode) {
1067 case TB_OUTPUT_256:
1068 case TB_OUTPUT_216:
1069 case TB_OUTPUT_GRAYSCALE:
1070 WRITE_LITERAL("\033[");
1071 if (fg != TB_DEFAULT) {
1072 WRITE_LITERAL("38;5;");
1073 WRITE_INT(fg);
1074 if (bg != TB_DEFAULT) {
1075 WRITE_LITERAL(";");
1076 }
1077 }
1078 if (bg != TB_DEFAULT) {
1079 WRITE_LITERAL("48;5;");
1080 WRITE_INT(bg);
1081 }
1082 WRITE_LITERAL("m");
1083 break;
1084 case TB_OUTPUT_NORMAL:
1085 default:
1086 WRITE_LITERAL("\033[");
1087 if (fg != TB_DEFAULT) {
1088 WRITE_LITERAL("3");
1089 WRITE_INT(fg - 1);
1090 if (bg != TB_DEFAULT) {
1091 WRITE_LITERAL(";");
1092 }
1093 }
1094 if (bg != TB_DEFAULT) {
1095 WRITE_LITERAL("4");
1096 WRITE_INT(bg - 1);
1097 }
1098 WRITE_LITERAL("m");
1099 break;
1100 }
1101 }
1102
1103 static void
1104 cellbuf_init(struct cellbuf *buf, int width, int height)
1105 {
1106 buf->cells = (struct tb_cell *)malloc(
1107 sizeof(struct tb_cell) * width * height);
1108 assert(buf->cells);
1109 buf->width = width;
1110 buf->height = height;
1111 }
1112
1113 static void
1114 cellbuf_resize(struct cellbuf *buf, int width, int height)
1115 {
1116 if (buf->width == width && buf->height == height)
1117 return;
1118
1119 int oldw = buf->width;
1120 int oldh = buf->height;
1121 struct tb_cell *oldcells = buf->cells;
1122
1123 cellbuf_init(buf, width, height);
1124 cellbuf_clear(buf);
1125
1126 int minw = (width < oldw) ? width : oldw;
1127 int minh = (height < oldh) ? height : oldh;
1128 int i;
1129
1130 for (i = 0; i < minh; ++i) {
1131 struct tb_cell *csrc = oldcells + (i * oldw);
1132 struct tb_cell *cdst = buf->cells + (i * width);
1133 memcpy(cdst, csrc, sizeof(struct tb_cell) * minw);
1134 }
1135
1136 free(oldcells);
1137 }
1138
1139 static void
1140 cellbuf_clear(struct cellbuf *buf)
1141 {
1142 int i;
1143 int ncells = buf->width * buf->height;
1144
1145 for (i = 0; i < ncells; ++i) {
1146 buf->cells[i].ch = ' ';
1147 buf->cells[i].fg = foreground;
1148 buf->cells[i].bg = background;
1149 }
1150 }
1151
1152 static void
1153 cellbuf_free(struct cellbuf *buf)
1154 {
1155 free(buf->cells);
1156 }
1157
1158 static void
1159 get_term_size(int *w, int *h)
1160 {
1161 struct winsize sz;
1162 memset(&sz, 0, sizeof(sz));
1163
1164 ioctl(inout, TIOCGWINSZ, &sz);
1165
1166 if (w)
1167 *w = sz.ws_col;
1168 if (h)
1169 *h = sz.ws_row;
1170 }
1171
1172 static void
1173 update_term_size(void)
1174 {
1175 struct winsize sz;
1176 memset(&sz, 0, sizeof(sz));
1177
1178 ioctl(inout, TIOCGWINSZ, &sz);
1179
1180 termw = sz.ws_col;
1181 termh = sz.ws_row;
1182 }
1183
1184 static void
1185 send_attr(uint16_t fg, uint16_t bg)
1186 {
1187 #define LAST_ATTR_INIT 0xFFFF
1188 static uint16_t lastfg = LAST_ATTR_INIT, lastbg = LAST_ATTR_INIT;
1189 if (fg != lastfg || bg != lastbg) {
1190 bytebuffer_puts(&output_buffer, funcs[T_SGR0]);
1191
1192 uint16_t fgcol;
1193 uint16_t bgcol;
1194
1195 switch (outputmode) {
1196 case TB_OUTPUT_256:
1197 fgcol = fg & 0xFF;
1198 bgcol = bg & 0xFF;
1199 break;
1200
1201 case TB_OUTPUT_216:
1202 fgcol = fg & 0xFF;
1203 if (fgcol > 215)
1204 fgcol = 7;
1205 bgcol = bg & 0xFF;
1206 if (bgcol > 215)
1207 bgcol = 0;
1208 fgcol += 0x10;
1209 bgcol += 0x10;
1210 break;
1211
1212 case TB_OUTPUT_GRAYSCALE:
1213 fgcol = fg & 0xFF;
1214 if (fgcol > 23)
1215 fgcol = 23;
1216 bgcol = bg & 0xFF;
1217 if (bgcol > 23)
1218 bgcol = 0;
1219 fgcol += 0xe8;
1220 bgcol += 0xe8;
1221 break;
1222
1223 case TB_OUTPUT_NORMAL:
1224 default:
1225 fgcol = fg & 0x0F;
1226 bgcol = bg & 0x0F;
1227 }
1228
1229 if (fg & TB_BOLD)
1230 bytebuffer_puts(&output_buffer, funcs[T_BOLD]);
1231 if (bg & TB_BOLD)
1232 bytebuffer_puts(&output_buffer, funcs[T_BLINK]);
1233 if (fg & TB_UNDERLINE)
1234 bytebuffer_puts(&output_buffer, funcs[T_UNDERLINE]);
1235 if ((fg & TB_REVERSE) || (bg & TB_REVERSE))
1236 bytebuffer_puts(&output_buffer, funcs[T_REVERSE]);
1237
1238 write_sgr(fgcol, bgcol);
1239
1240 lastfg = fg;
1241 lastbg = bg;
1242 }
1243 }
1244
1245 static void
1246 send_char(int x, int y, uint32_t c)
1247 {
1248 char buf[7];
1249 int bw = tb_utf8_unicode_to_char(buf, c);
1250 if (x - 1 != lastx || y != lasty)
1251 write_cursor(x, y);
1252 lastx = x;
1253 lasty = y;
1254 if (!c)
1255 buf[0] = ' '; // replace 0 with whitespace
1256 bytebuffer_append(&output_buffer, buf, bw);
1257 }
1258
1259 static void
1260 send_clear(void)
1261 {
1262 send_attr(foreground, background);
1263 bytebuffer_puts(&output_buffer, funcs[T_CLEAR_SCREEN]);
1264 if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
1265 write_cursor(cursor_x, cursor_y);
1266 bytebuffer_flush(&output_buffer, inout);
1267
1268 /* we need to invalidate cursor position too and these two vars are
1269 * used only for simple cursor positioning optimization, cursor
1270 * actually may be in the correct place, but we simply discard
1271 * optimization once and it gives us simple solution for the case when
1272 * cursor moved */
1273 lastx = LAST_COORD_INIT;
1274 lasty = LAST_COORD_INIT;
1275 }
1276
1277 static void
1278 sigwinch_handler(int xxx)
1279 {
1280 (void)xxx;
1281 const int zzz = 1;
1282 (void)write(winch_fds[1], &zzz, sizeof(int));
1283 }
1284
1285 static void
1286 update_size(void)
1287 {
1288 update_term_size();
1289 cellbuf_resize(&back_buffer, termw, termh);
1290 cellbuf_resize(&front_buffer, termw, termh);
1291 cellbuf_clear(&front_buffer);
1292 send_clear();
1293 }
1294
1295 static int
1296 read_up_to(int n)
1297 {
1298 assert(n > 0);
1299 const int prevlen = input_buffer.len;
1300 bytebuffer_resize(&input_buffer, prevlen + n);
1301
1302 int read_n = 0;
1303 while (read_n <= n) {
1304 ssize_t r = 0;
1305 if (read_n < n) {
1306 r = read(inout, input_buffer.buf + prevlen + read_n,
1307 n - read_n);
1308 }
1309 #ifdef __CYGWIN__
1310 // While linux man for tty says when VMIN == 0 && VTIME == 0, read
1311 // should return 0 when there is nothing to read, cygwin's read returns
1312 // -1. Not sure why and if it's correct to ignore it, but let's pretend
1313 // it's zero.
1314 if (r < 0)
1315 r = 0;
1316 #endif
1317 if (r < 0) {
1318 // EAGAIN / EWOULDBLOCK shouldn't occur here
1319 assert(errno != EAGAIN && errno != EWOULDBLOCK);
1320 return -1;
1321 } else if (r > 0) {
1322 read_n += r;
1323 } else {
1324 bytebuffer_resize(&input_buffer, prevlen + read_n);
1325 return read_n;
1326 }
1327 }
1328 assert(!"unreachable");
1329 return 0;
1330 }
1331
1332 static int
1333 wait_fill_event(struct tb_event *event, struct timeval *timeout)
1334 {
1335 // ;-)
1336 #define ENOUGH_DATA_FOR_PARSING 64
1337 fd_set events;
1338 memset(event, 0, sizeof(struct tb_event));
1339
1340 // try to extract event from input buffer, return on success
1341 event->type = TB_EVENT_KEY;
1342 if (extract_event(event, &input_buffer))
1343 return event->type;
1344
1345 // it looks like input buffer is incomplete, let's try the short path,
1346 // but first make sure there is enough space
1347 int n = read_up_to(ENOUGH_DATA_FOR_PARSING);
1348 if (n < 0)
1349 return -1;
1350 if (n > 0 && extract_event(event, &input_buffer))
1351 return event->type;
1352
1353 // n == 0, or not enough data, let's go to select
1354 while (1) {
1355 FD_ZERO(&events);
1356 FD_SET(inout, &events);
1357 FD_SET(winch_fds[0], &events);
1358 int maxfd = (winch_fds[0] > inout) ? winch_fds[0] : inout;
1359 int result = select(maxfd + 1, &events, 0, 0, timeout);
1360 if (!result)
1361 return 0;
1362
1363 if (FD_ISSET(inout, &events)) {
1364 event->type = TB_EVENT_KEY;
1365 n = read_up_to(ENOUGH_DATA_FOR_PARSING);
1366 if (n < 0)
1367 return -1;
1368
1369 if (n == 0)
1370 continue;
1371
1372 if (extract_event(event, &input_buffer))
1373 return event->type;
1374 }
1375 if (FD_ISSET(winch_fds[0], &events)) {
1376 event->type = TB_EVENT_RESIZE;
1377 int zzz = 0;
1378 (void)read(winch_fds[0], &zzz, sizeof(int));
1379 buffer_size_change_request = 1;
1380 get_term_size(&event->w, &event->h);
1381 return TB_EVENT_RESIZE;
1382 }
1383 }
1384 }
simple file manager