termbox.c

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <signal.h>
   7 #include <stdio.h>
   8 #include <stdbool.h>
   9 #include <sys/select.h>
  10 #include <sys/ioctl.h>
  11 #include <sys/time.h>
  12 #include <sys/stat.h>
  13 #include <termios.h>
  14 #include <unistd.h>
  15 #include <wchar.h>
  16
  17 #include "termbox.h"
  18
  19 static int inputmode = TB_INPUT_ESC;
  20
  21 /* bytebuffer.inl --------------------------------------------------------- */
  22
  23 struct bytebuffer {
  24         char *buf;
  25         int len;
  26         int cap;
  27 };
  28
  29 static void bytebuffer_reserve(struct bytebuffer *b, int cap) {
  30         if (b->cap >= cap) {
  31                 return;
  32         }
  33
  34         // prefer doubling capacity
  35         if (b->cap * 2 >= cap) {
  36                 cap = b->cap * 2;
  37         }
  38
  39         char *newbuf = realloc(b->buf, cap);
  40         b->buf = newbuf;
  41         b->cap = cap;
  42 }
  43
  44 static void bytebuffer_init(struct bytebuffer *b, int cap) {
  45         b->cap = 0;
  46         b->len = 0;
  47         b->buf = 0;
  48
  49         if (cap > 0) {
  50                 b->cap = cap;
  51                 b->buf = malloc(cap); // just assume malloc works always
  52         }
  53 }
  54
  55 static void bytebuffer_free(struct bytebuffer *b) {
  56         if (b->buf)
  57                 free(b->buf);
  58 }
  59
  60 static void bytebuffer_clear(struct bytebuffer *b) {
  61         b->len = 0;
  62 }
  63
  64 static void bytebuffer_append(struct bytebuffer *b, const char *data, int len) {
  65         bytebuffer_reserve(b, b->len + len);
  66         memcpy(b->buf + b->len, data, len);
  67         b->len += len;
  68 }
  69
  70 static void bytebuffer_puts(struct bytebuffer *b, const char *str) {
  71         bytebuffer_append(b, str, strlen(str));
  72 }
  73
  74 static void bytebuffer_resize(struct bytebuffer *b, int len) {
  75         bytebuffer_reserve(b, len);
  76         b->len = len;
  77 }
  78
  79 static void bytebuffer_flush(struct bytebuffer *b, int fd) {
  80         (void)write(fd, b->buf, b->len);
  81         bytebuffer_clear(b);
  82 }
  83
  84 static void bytebuffer_truncate(struct bytebuffer *b, int n) {
  85         if (n <= 0)
  86                 return;
  87         if (n > b->len)
  88                 n = b->len;
  89         const int nmove = b->len - n;
  90         memmove(b->buf, b->buf+n, nmove);
  91         b->len -= n;
  92 }
  93
  94 /* term.inl --------------------------------------------------------------- */
  95 enum {
  96         T_ENTER_CA,
  97         T_EXIT_CA,
  98         T_SHOW_CURSOR,
  99         T_HIDE_CURSOR,
 100         T_CLEAR_SCREEN,
 101         T_SGR0,
 102         T_UNDERLINE,
 103         T_BOLD,
 104         T_BLINK,
 105         T_REVERSE,
 106         T_ENTER_KEYPAD,
 107         T_EXIT_KEYPAD,
 108         T_ENTER_MOUSE,
 109         T_EXIT_MOUSE,
 110         T_FUNCS_NUM,
 111 };
 112
 113 #define ENTER_MOUSE_SEQ "\x1b[?1000h\x1b[?1002h\x1b[?1015h\x1b[?1006h"
 114 #define EXIT_MOUSE_SEQ "\x1b[?1006l\x1b[?1015l\x1b[?1002l\x1b[?1000l"
 115
 116 #define EUNSUPPORTED_TERM -1
 117
 118 // rxvt-256color
 119 static const char *rxvt_256color_keys[] = {
 120         "\033[11~","\033[12~","\033[13~","\033[14~","\033[15~","\033[17~","\033[18~","\033[19~","\033[20~","\033[21~","\033[23~","\033[24~","\033[2~","\033[3~","\033[7~","\033[8~","\033[5~","\033[6~","\033[A","\033[B","\033[D","\033[C", 0
 121 };
 122 static const char *rxvt_256color_funcs[] = {
 123         "\0337\033[?47h", "\033[2J\033[?47l\0338", "\033[?25h", "\033[?25l", "\033[H\033[2J", "\033[m", "\033[4m", "\033[1m", "\033[5m", "\033[7m", "\033=", "\033>", ENTER_MOUSE_SEQ, EXIT_MOUSE_SEQ,
 124 };
 125
 126 // Eterm
 127 static const char *eterm_keys[] = {
 128         "\033[11~","\033[12~","\033[13~","\033[14~","\033[15~","\033[17~","\033[18~","\033[19~","\033[20~","\033[21~","\033[23~","\033[24~","\033[2~","\033[3~","\033[7~","\033[8~","\033[5~","\033[6~","\033[A","\033[B","\033[D","\033[C", 0
 129 };
 130 static const char *eterm_funcs[] = {
 131         "\0337\033[?47h", "\033[2J\033[?47l\0338", "\033[?25h", "\033[?25l", "\033[H\033[2J", "\033[m", "\033[4m", "\033[1m", "\033[5m", "\033[7m", "", "", "", "",
 132 };
 133
 134 // screen
 135 static const char *screen_keys[] = {
 136         "\033OP","\033OQ","\033OR","\033OS","\033[15~","\033[17~","\033[18~","\033[19~","\033[20~","\033[21~","\033[23~","\033[24~","\033[2~","\033[3~","\033[1~","\033[4~","\033[5~","\033[6~","\033OA","\033OB","\033OD","\033OC", 0
 137 };
 138 static const char *screen_funcs[] = {
 139         "\033[?1049h", "\033[?1049l", "\033[34h\033[?25h", "\033[?25l", "\033[H\033[J", "\033[m", "\033[4m", "\033[1m", "\033[5m", "\033[7m", "\033[?1h\033=", "\033[?1l\033>", ENTER_MOUSE_SEQ, EXIT_MOUSE_SEQ,
 140 };
 141
 142 // rxvt-unicode
 143 static const char *rxvt_unicode_keys[] = {
 144         "\033[11~","\033[12~","\033[13~","\033[14~","\033[15~","\033[17~","\033[18~","\033[19~","\033[20~","\033[21~","\033[23~","\033[24~","\033[2~","\033[3~","\033[7~","\033[8~","\033[5~","\033[6~","\033[A","\033[B","\033[D","\033[C", 0
 145 };
 146 static const char *rxvt_unicode_funcs[] = {
 147         "\033[?1049h", "\033[r\033[?1049l", "\033[?25h", "\033[?25l", "\033[H\033[2J", "\033[m\033(B", "\033[4m", "\033[1m", "\033[5m", "\033[7m", "\033=", "\033>", ENTER_MOUSE_SEQ, EXIT_MOUSE_SEQ,
 148 };
 149
 150 // linux
 151 static const char *linux_keys[] = {
 152         "\033[[A","\033[[B","\033[[C","\033[[D","\033[[E","\033[17~","\033[18~","\033[19~","\033[20~","\033[21~","\033[23~","\033[24~","\033[2~","\033[3~","\033[1~","\033[4~","\033[5~","\033[6~","\033[A","\033[B","\033[D","\033[C", 0
 153 };
 154 static const char *linux_funcs[] = {
 155         "", "", "\033[?25h\033[?0c", "\033[?25l\033[?1c", "\033[H\033[J", "\033[0;10m", "\033[4m", "\033[1m", "\033[5m", "\033[7m", "", "", "", "",
 156 };
 157
 158 // xterm
 159 static const char *xterm_keys[] = {
 160         "\033OP","\033OQ","\033OR","\033OS","\033[15~","\033[17~","\033[18~","\033[19~","\033[20~","\033[21~","\033[23~","\033[24~","\033[2~","\033[3~","\033OH","\033OF","\033[5~","\033[6~","\033OA","\033OB","\033OD","\033OC", 0
 161 };
 162 static const char *xterm_funcs[] = {
 163         "\033[?1049h", "\033[?1049l", "\033[?12l\033[?25h", "\033[?25l", "\033[H\033[2J", "\033(B\033[m", "\033[4m", "\033[1m", "\033[5m", "\033[7m", "\033[?1h\033=", "\033[?1l\033>", ENTER_MOUSE_SEQ, EXIT_MOUSE_SEQ,
 164 };
 165
 166 static struct term {
 167         const char *name;
 168         const char **keys;
 169         const char **funcs;
 170 } terms[] = {
 171         {"rxvt-256color", rxvt_256color_keys, rxvt_256color_funcs},
 172         {"Eterm", eterm_keys, eterm_funcs},
 173         {"screen", screen_keys, screen_funcs},
 174         {"rxvt-unicode", rxvt_unicode_keys, rxvt_unicode_funcs},
 175         {"linux", linux_keys, linux_funcs},
 176         {"xterm", xterm_keys, xterm_funcs},
 177         {0, 0, 0},
 178 };
 179
 180 static bool init_from_terminfo = false;
 181 static const char **keys;
 182 static const char **funcs;
 183
 184 static int try_compatible(const char *term, const char *name,
 185                           const char **tkeys, const char **tfuncs)
 186 {
 187         if (strstr(term, name)) {
 188                 keys = tkeys;
 189                 funcs = tfuncs;
 190                 return 0;
 191         }
 192
 193         return EUNSUPPORTED_TERM;
 194 }
 195
 196 static int init_term_builtin(void)
 197 {
 198         int i;
 199         const char *term = getenv("TERM");
 200
 201         if (term) {
 202                 for (i = 0; terms[i].name; i++) {
 203                         if (!strcmp(terms[i].name, term)) {
 204                                 keys = terms[i].keys;
 205                                 funcs = terms[i].funcs;
 206                                 return 0;
 207                         }
 208                 }
 209
 210                 /* let's do some heuristic, maybe it's a compatible terminal */
 211                 if (try_compatible(term, "xterm", xterm_keys, xterm_funcs) == 0)
 212                         return 0;
 213                 if (try_compatible(term, "rxvt", rxvt_unicode_keys, rxvt_unicode_funcs) == 0)
 214                         return 0;
 215                 if (try_compatible(term, "linux", linux_keys, linux_funcs) == 0)
 216                         return 0;
 217                 if (try_compatible(term, "Eterm", eterm_keys, eterm_funcs) == 0)
 218                         return 0;
 219                 if (try_compatible(term, "screen", screen_keys, screen_funcs) == 0)
 220                         return 0;
 221                 if (try_compatible(term, "tmux", screen_keys, screen_funcs) == 0)
 222                         return 0;
 223                 /* let's assume that 'cygwin' is xterm compatible */
 224                 if (try_compatible(term, "cygwin", xterm_keys, xterm_funcs) == 0)
 225                         return 0;
 226         }
 227
 228         return EUNSUPPORTED_TERM;
 229 }
 230
 231 //----------------------------------------------------------------------
 232 // terminfo
 233 //----------------------------------------------------------------------
 234
 235 static char *read_file(const char *file) {
 236         FILE *f = fopen(file, "rb");
 237         if (!f)
 238                 return 0;
 239
 240         struct stat st;
 241         if (fstat(fileno(f), &st) != 0) {
 242                 fclose(f);
 243                 return 0;
 244         }
 245
 246         char *data = malloc(st.st_size);
 247         if (!data) {
 248                 fclose(f);
 249                 return 0;
 250         }
 251
 252         if (fread(data, 1, st.st_size, f) != (size_t)st.st_size) {
 253                 fclose(f);
 254                 free(data);
 255                 return 0;
 256         }
 257
 258         fclose(f);
 259         return data;
 260 }
 261
 262 static char *terminfo_try_path(const char *path, const char *term) {
 263         char tmp[4096];
 264         snprintf(tmp, sizeof(tmp), "%s/%c/%s", path, term[0], term);
 265         tmp[sizeof(tmp)-1] = '\0';
 266         char *data = read_file(tmp);
 267         if (data) {
 268                 return data;
 269         }
 270
 271         // fallback to darwin specific dirs structure
 272         snprintf(tmp, sizeof(tmp), "%s/%x/%s", path, term[0], term);
 273         tmp[sizeof(tmp)-1] = '\0';
 274         return read_file(tmp);
 275 }
 276
 277 static char *load_terminfo(void) {
 278         char tmp[4096];
 279         const char *term = getenv("TERM");
 280         if (!term) {
 281                 return 0;
 282         }
 283
 284         // if TERMINFO is set, no other directory should be searched
 285         const char *terminfo = getenv("TERMINFO");
 286         if (terminfo) {
 287                 return terminfo_try_path(terminfo, term);
 288         }
 289
 290         // next, consider ~/.terminfo
 291         const char *home = getenv("HOME");
 292         if (home) {
 293                 snprintf(tmp, sizeof(tmp), "%s/.terminfo", home);
 294                 tmp[sizeof(tmp)-1] = '\0';
 295                 char *data = terminfo_try_path(tmp, term);
 296                 if (data)
 297                         return data;
 298         }
 299
 300         // next, TERMINFO_DIRS
 301         const char *dirs = getenv("TERMINFO_DIRS");
 302         if (dirs) {
 303                 snprintf(tmp, sizeof(tmp), "%s", dirs);
 304                 tmp[sizeof(tmp)-1] = '\0';
 305                 char *dir = strtok(tmp, ":");
 306                 while (dir) {
 307                         const char *cdir = dir;
 308                         if (strcmp(cdir, "") == 0) {
 309                                 cdir = "/usr/share/terminfo";
 310                         }
 311                         char *data = terminfo_try_path(cdir, term);
 312                         if (data)
 313                                 return data;
 314                         dir = strtok(0, ":");
 315                 }
 316         }
 317
 318         // fallback to /usr/share/terminfo
 319         return terminfo_try_path("/usr/share/terminfo", term);
 320 }
 321
 322 #define TI_MAGIC 0432
 323 #define TI_ALT_MAGIC 542
 324 #define TI_HEADER_LENGTH 12
 325 #define TB_KEYS_NUM 22
 326
 327 static const char *terminfo_copy_string(char *data, int str, int table) {
 328         const int16_t off = *(int16_t*)(data + str);
 329         const char *src = data + table + off;
 330         int len = strlen(src);
 331         char *dst = malloc(len+1);
 332         strcpy(dst, src);
 333         return dst;
 334 }
 335
 336 static const int16_t ti_funcs[] = {
 337         28, 40, 16, 13, 5, 39, 36, 27, 26, 34, 89, 88,
 338 };
 339
 340 static const int16_t ti_keys[] = {
 341         66, 68 /* apparently not a typo; 67 is F10 for whatever reason */, 69,
 342         70, 71, 72, 73, 74, 75, 67, 216, 217, 77, 59, 76, 164, 82, 81, 87, 61,
 343         79, 83,
 344 };
 345
 346 static int init_term(void) {
 347         int i;
 348         char *data = load_terminfo();
 349         if (!data) {
 350                 init_from_terminfo = false;
 351                 return init_term_builtin();
 352         }
 353
 354         int16_t *header = (int16_t*)data;
 355
 356         const int number_sec_len = header[0] == TI_ALT_MAGIC ? 4 : 2;
 357
 358         if ((header[1] + header[2]) % 2) {
 359                 // old quirk to align everything on word boundaries
 360                 header[2] += 1;
 361         }
 362
 363         const int str_offset = TI_HEADER_LENGTH +
 364                 header[1] + header[2] + number_sec_len * header[3];
 365         const int table_offset = str_offset + 2 * header[4];
 366
 367         keys = malloc(sizeof(const char*) * (TB_KEYS_NUM+1));
 368         for (i = 0; i < TB_KEYS_NUM; i++) {
 369                 keys[i] = terminfo_copy_string(data,
 370                         str_offset + 2 * ti_keys[i], table_offset);
 371         }
 372         keys[TB_KEYS_NUM] = 0;
 373
 374         funcs = malloc(sizeof(const char*) * T_FUNCS_NUM);
 375         // the last two entries are reserved for mouse. because the table offset is
 376         // not there, the two entries have to fill in manually
 377         for (i = 0; i < T_FUNCS_NUM-2; i++) {
 378                 funcs[i] = terminfo_copy_string(data,
 379                         str_offset + 2 * ti_funcs[i], table_offset);
 380         }
 381
 382         funcs[T_FUNCS_NUM-2] = ENTER_MOUSE_SEQ;
 383         funcs[T_FUNCS_NUM-1] = EXIT_MOUSE_SEQ;
 384
 385         init_from_terminfo = true;
 386         free(data);
 387         return 0;
 388 }
 389
 390 static void shutdown_term(void) {
 391         if (init_from_terminfo) {
 392                 int i;
 393                 for (i = 0; i < TB_KEYS_NUM; i++) {
 394                         free((void*)keys[i]);
 395                 }
 396                 // the last two entries are reserved for mouse. because the table offset
 397                 // is not there, the two entries have to fill in manually and do not
 398                 // need to be freed.
 399                 for (i = 0; i < T_FUNCS_NUM-2; i++) {
 400                         free((void*)funcs[i]);
 401                 }
 402                 free(keys);
 403                 free(funcs);
 404         }
 405 }
 406
 407 /* input.inl -------------------------------------------------------------- */
 408
 409 // if s1 starts with s2 returns true, else false
 410 // len is the length of s1
 411 // s2 should be null-terminated
 412 static bool starts_with(const char *s1, int len, const char *s2)
 413 {
 414         int n = 0;
 415         while (*s2 && n < len) {
 416                 if (*s1++ != *s2++)
 417                         return false;
 418                 n++;
 419         }
 420         return *s2 == 0;
 421 }
 422
 423 static int parse_mouse_event(struct tb_event *event, const char *buf, int len) {
 424         if (len >= 6 && starts_with(buf, len, "\033[M")) {
 425                 // X10 mouse encoding, the simplest one
 426                 // \033 [ M Cb Cx Cy
 427                 int b = buf[3] - 32;
 428                 switch (b & 3) {
 429                 case 0:
 430                         if ((b & 64) != 0)
 431                                 event->key = TB_KEY_MOUSE_WHEEL_UP;
 432                         else
 433                                 event->key = TB_KEY_MOUSE_LEFT;
 434                         break;
 435                 case 1:
 436                         if ((b & 64) != 0)
 437                                 event->key = TB_KEY_MOUSE_WHEEL_DOWN;
 438                         else
 439                                 event->key = TB_KEY_MOUSE_MIDDLE;
 440                         break;
 441                 case 2:
 442                         event->key = TB_KEY_MOUSE_RIGHT;
 443                         break;
 444                 case 3:
 445                         event->key = TB_KEY_MOUSE_RELEASE;
 446                         break;
 447                 default:
 448                         return -6;
 449                 }
 450                 event->type = TB_EVENT_MOUSE; // TB_EVENT_KEY by default
 451                 if ((b & 32) != 0)
 452                         event->mod |= TB_MOD_MOTION;
 453
 454                 // the coord is 1,1 for upper left
 455                 event->x = (uint8_t)buf[4] - 1 - 32;
 456                 event->y = (uint8_t)buf[5] - 1 - 32;
 457
 458                 return 6;
 459         } else if (starts_with(buf, len, "\033[<") || starts_with(buf, len, "\033[")) {
 460                 // xterm 1006 extended mode or urxvt 1015 extended mode
 461                 // xterm: \033 [ < Cb ; Cx ; Cy (M or m)
 462                 // urxvt: \033 [ Cb ; Cx ; Cy M
 463                 int i, mi = -1, starti = -1;
 464                 int isM, isU, s1 = -1, s2 = -1;
 465                 int n1 = 0, n2 = 0, n3 = 0;
 466
 467                 for (i = 0; i < len; i++) {
 468                         // We search the first (s1) and the last (s2) ';'
 469                         if (buf[i] == ';') {
 470                                 if (s1 == -1)
 471                                         s1 = i;
 472                                 s2 = i;
 473                         }
 474
 475                         // We search for the first 'm' or 'M'
 476                         if ((buf[i] == 'm' || buf[i] == 'M') && mi == -1) {
 477                                 mi = i;
 478                                 break;
 479                         }
 480                 }
 481                 if (mi == -1)
 482                         return 0;
 483
 484                 // whether it's a capital M or not
 485                 isM = (buf[mi] == 'M');
 486
 487                 if (buf[2] == '<') {
 488                         isU = 0;
 489                         starti = 3;
 490                 } else {
 491                         isU = 1;
 492                         starti = 2;
 493                 }
 494
 495                 if (s1 == -1 || s2 == -1 || s1 == s2)
 496                         return 0;
 497
 498                 n1 = strtoul(&buf[starti], NULL, 10);
 499                 n2 = strtoul(&buf[s1 + 1], NULL, 10);
 500                 n3 = strtoul(&buf[s2 + 1], NULL, 10);
 501
 502                 if (isU)
 503                         n1 -= 32;
 504
 505                 switch (n1 & 3) {
 506                 case 0:
 507                         if ((n1&64) != 0) {
 508                                 event->key = TB_KEY_MOUSE_WHEEL_UP;
 509                         } else {
 510                                 event->key = TB_KEY_MOUSE_LEFT;
 511                         }
 512                         break;
 513                 case 1:
 514                         if ((n1&64) != 0) {
 515                                 event->key = TB_KEY_MOUSE_WHEEL_DOWN;
 516                         } else {
 517                                 event->key = TB_KEY_MOUSE_MIDDLE;
 518                         }
 519                         break;
 520                 case 2:
 521                         event->key = TB_KEY_MOUSE_RIGHT;
 522                         break;
 523                 case 3:
 524                         event->key = TB_KEY_MOUSE_RELEASE;
 525                         break;
 526                 default:
 527                         return mi + 1;
 528                 }
 529
 530                 if (!isM) {
 531                         // on xterm mouse release is signaled by lowercase m
 532                         event->key = TB_KEY_MOUSE_RELEASE;
 533                 }
 534
 535                 event->type = TB_EVENT_MOUSE; // TB_EVENT_KEY by default
 536                 if ((n1&32) != 0)
 537                         event->mod |= TB_MOD_MOTION;
 538
 539                 event->x = (uint8_t)n2 - 1;
 540                 event->y = (uint8_t)n3 - 1;
 541
 542                 return mi + 1;
 543         }
 544
 545         return 0;
 546 }
 547
 548 // convert escape sequence to event, and return consumed bytes on success (failure == 0)
 549 static int parse_escape_seq(struct tb_event *event, const char *buf, int len)
 550 {
 551         int mouse_parsed = parse_mouse_event(event, buf, len);
 552
 553         if (mouse_parsed != 0)
 554                 return mouse_parsed;
 555
 556         // it's pretty simple here, find 'starts_with' match and return
 557         // success, else return failure
 558         int i;
 559         for (i = 0; keys[i]; i++) {
 560                 if (starts_with(buf, len, keys[i])) {
 561                         event->ch = 0;
 562                         event->key = 0xFFFF-i;
 563                         return strlen(keys[i]);
 564                 }
 565         }
 566         return 0;
 567 }
 568
 569 static bool extract_event(struct tb_event *event, struct bytebuffer *inbuf)
 570 {
 571         const char *buf = inbuf->buf;
 572         const int len = inbuf->len;
 573         if (len == 0)
 574                 return false;
 575
 576         if (buf[0] == '\033') {
 577                 int n = parse_escape_seq(event, buf, len);
 578                 if (n != 0) {
 579                         bool success = true;
 580                         if (n < 0) {
 581                                 success = false;
 582                                 n = -n;
 583                         }
 584                         bytebuffer_truncate(inbuf, n);
 585                         return success;
 586                 } else {
 587                         // it's not escape sequence, then it's ALT or ESC,
 588                         // check inputmode
 589                         if (inputmode&TB_INPUT_ESC) {
 590                                 // if we're in escape mode, fill ESC event, pop
 591                                 // buffer, return success
 592                                 event->ch = 0;
 593                                 event->key = TB_KEY_ESC;
 594                                 event->mod = 0;
 595                                 bytebuffer_truncate(inbuf, 1);
 596                                 return true;
 597                         } else if (inputmode&TB_INPUT_ALT) {
 598                                 // if we're in alt mode, set ALT modifier to
 599                                 // event and redo parsing
 600                                 event->mod = TB_MOD_ALT;
 601                                 bytebuffer_truncate(inbuf, 1);
 602                                 return extract_event(event, inbuf);
 603                         }
 604                         assert(!"never got here");
 605                 }
 606         }
 607
 608         // if we're here, this is not an escape sequence and not an alt sequence
 609         // so, it's a FUNCTIONAL KEY or a UNICODE character
 610
 611         // first of all check if it's a functional key
 612         if ((unsigned char)buf[0] <= TB_KEY_SPACE ||
 613             (unsigned char)buf[0] == TB_KEY_BACKSPACE2)
 614         {
 615                 // fill event, pop buffer, return success */
 616                 event->ch = 0;
 617                 event->key = (uint16_t)buf[0];
 618                 bytebuffer_truncate(inbuf, 1);
 619                 return true;
 620         }
 621
 622         // feh... we got utf8 here
 623
 624         // check if there is all bytes
 625         if (len >= tb_utf8_char_length(buf[0])) {
 626                 /* everything ok, fill event, pop buffer, return success */
 627                 tb_utf8_char_to_unicode(&event->ch, buf);
 628                 event->key = 0;
 629                 bytebuffer_truncate(inbuf, tb_utf8_char_length(buf[0]));
 630                 return true;
 631         }
 632
 633         // event isn't recognized, perhaps there is not enough bytes in utf8
 634         // sequence
 635         return false;
 636 }
 637
 638 /* -------------------------------------------------------- */
 639
 640 struct cellbuf {
 641         int width;
 642         int height;
 643         struct tb_cell *cells;
 644 };
 645
 646 #define CELL(buf, x, y) (buf)->cells[(y) * (buf)->width + (x)]
 647 #define IS_CURSOR_HIDDEN(cx, cy) (cx == -1 || cy == -1)
 648 #define LAST_COORD_INIT -1
 649
 650 static struct termios orig_tios;
 651
 652 static struct cellbuf back_buffer;
 653 static struct cellbuf front_buffer;
 654 static struct bytebuffer output_buffer;
 655 static struct bytebuffer input_buffer;
 656
 657 static int termw = -1;
 658 static int termh = -1;
 659
 660 static int outputmode = TB_OUTPUT_NORMAL;
 661
 662 static int inout;
 663 static int winch_fds[2];
 664
 665 static int lastx = LAST_COORD_INIT;
 666 static int lasty = LAST_COORD_INIT;
 667 static int cursor_x = -1;
 668 static int cursor_y = -1;
 669
 670 static uint16_t background = TB_DEFAULT;
 671 static uint16_t foreground = TB_DEFAULT;
 672
 673 static void write_cursor(int x, int y);
 674 static void write_sgr(uint16_t fg, uint16_t bg);
 675
 676 static void cellbuf_init(struct cellbuf *buf, int width, int height);
 677 static void cellbuf_resize(struct cellbuf *buf, int width, int height);
 678 static void cellbuf_clear(struct cellbuf *buf);
 679 static void cellbuf_free(struct cellbuf *buf);
 680
 681 static void update_size(void);
 682 static void update_term_size(void);
 683 static void send_attr(uint16_t fg, uint16_t bg);
 684 static void send_char(int x, int y, uint32_t c);
 685 static void send_clear(void);
 686 static void sigwinch_handler(int xxx);
 687 static int wait_fill_event(struct tb_event *event, struct timeval *timeout);
 688
 689 /* may happen in a different thread */
 690 static volatile int buffer_size_change_request;
 691
 692 /* -------------------------------------------------------- */
 693
 694 int tb_init_fd(int inout_)
 695 {
 696         inout = inout_;
 697         if (inout == -1) {
 698                 return TB_EFAILED_TO_OPEN_TTY;
 699         }
 700
 701         if (init_term() < 0) {
 702                 close(inout);
 703                 return TB_EUNSUPPORTED_TERMINAL;
 704         }
 705
 706         if (pipe(winch_fds) < 0) {
 707                 close(inout);
 708                 return TB_EPIPE_TRAP_ERROR;
 709         }
 710
 711         struct sigaction sa;
 712         memset(&sa, 0, sizeof(sa));
 713         sa.sa_handler = sigwinch_handler;
 714         sa.sa_flags = 0;
 715         sigaction(SIGWINCH, &sa, 0);
 716
 717         tcgetattr(inout, &orig_tios);
 718
 719         struct termios tios;
 720         memcpy(&tios, &orig_tios, sizeof(tios));
 721
 722         tios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
 723                            | INLCR | IGNCR | ICRNL | IXON);
 724         tios.c_oflag &= ~OPOST;
 725         tios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
 726         tios.c_cflag &= ~(CSIZE | PARENB);
 727         tios.c_cflag |= CS8;
 728         tios.c_cc[VMIN] = 0;
 729         tios.c_cc[VTIME] = 0;
 730         tcsetattr(inout, TCSAFLUSH, &tios);
 731
 732         bytebuffer_init(&input_buffer, 128);
 733         bytebuffer_init(&output_buffer, 32 * 1024);
 734
 735         bytebuffer_puts(&output_buffer, funcs[T_ENTER_CA]);
 736         bytebuffer_puts(&output_buffer, funcs[T_ENTER_KEYPAD]);
 737         bytebuffer_puts(&output_buffer, funcs[T_HIDE_CURSOR]);
 738         send_clear();
 739
 740         update_term_size();
 741         cellbuf_init(&back_buffer, termw, termh);
 742         cellbuf_init(&front_buffer, termw, termh);
 743         cellbuf_clear(&back_buffer);
 744         cellbuf_clear(&front_buffer);
 745
 746         return 0;
 747 }
 748
 749 int tb_init_file(const char* name){
 750         return tb_init_fd(open(name, O_RDWR));
 751 }
 752
 753 int tb_init(void)
 754 {
 755         return tb_init_file("/dev/tty");
 756 }
 757
 758 void tb_shutdown(void)
 759 {
 760         if (termw == -1) {
 761                 fputs("tb_shutdown() should not be called twice.", stderr);
 762                 abort();
 763         }
 764
 765         bytebuffer_puts(&output_buffer, funcs[T_SHOW_CURSOR]);
 766         bytebuffer_puts(&output_buffer, funcs[T_SGR0]);
 767         bytebuffer_puts(&output_buffer, funcs[T_CLEAR_SCREEN]);
 768         bytebuffer_puts(&output_buffer, funcs[T_EXIT_CA]);
 769         bytebuffer_puts(&output_buffer, funcs[T_EXIT_KEYPAD]);
 770         bytebuffer_puts(&output_buffer, funcs[T_EXIT_MOUSE]);
 771         bytebuffer_flush(&output_buffer, inout);
 772         tcsetattr(inout, TCSAFLUSH, &orig_tios);
 773
 774         shutdown_term();
 775         close(inout);
 776         close(winch_fds[0]);
 777         close(winch_fds[1]);
 778
 779         cellbuf_free(&back_buffer);
 780         cellbuf_free(&front_buffer);
 781         bytebuffer_free(&output_buffer);
 782         bytebuffer_free(&input_buffer);
 783         termw = termh = -1;
 784 }
 785
 786 void tb_present(void)
 787 {
 788         int x,y,w,i;
 789         struct tb_cell *back, *front;
 790
 791         /* invalidate cursor position */
 792         lastx = LAST_COORD_INIT;
 793         lasty = LAST_COORD_INIT;
 794
 795         if (buffer_size_change_request) {
 796                 update_size();
 797                 buffer_size_change_request = 0;
 798         }
 799
 800         for (y = 0; y < front_buffer.height; ++y) {
 801                 for (x = 0; x < front_buffer.width; ) {
 802                         back = &CELL(&back_buffer, x, y);
 803                         front = &CELL(&front_buffer, x, y);
 804                         w = wcwidth(back->ch);
 805                         if (w < 1) w = 1;
 806                         if (memcmp(back, front, sizeof(struct tb_cell)) == 0) {
 807                                 x += w;
 808                                 continue;
 809                         }
 810                         memcpy(front, back, sizeof(struct tb_cell));
 811                         send_attr(back->fg, back->bg);
 812                         if (w > 1 && x >= front_buffer.width - (w - 1)) {
 813                                 // Not enough room for wide ch, so send spaces
 814                                 for (i = x; i < front_buffer.width; ++i) {
 815                                         send_char(i, y, ' ');
 816                                 }
 817                         } else {
 818                                 send_char(x, y, back->ch);
 819                                 for (i = 1; i < w; ++i) {
 820                                         front = &CELL(&front_buffer, x + i, y);
 821                                         front->ch = 0;
 822                                         front->fg = back->fg;
 823                                         front->bg = back->bg;
 824                                 }
 825                         }
 826                         x += w;
 827                 }
 828         }
 829         if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
 830                 write_cursor(cursor_x, cursor_y);
 831         bytebuffer_flush(&output_buffer, inout);
 832 }
 833
 834 void tb_set_cursor(int cx, int cy)
 835 {
 836         if (IS_CURSOR_HIDDEN(cursor_x, cursor_y) && !IS_CURSOR_HIDDEN(cx, cy))
 837                 bytebuffer_puts(&output_buffer, funcs[T_SHOW_CURSOR]);
 838
 839         if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y) && IS_CURSOR_HIDDEN(cx, cy))
 840                 bytebuffer_puts(&output_buffer, funcs[T_HIDE_CURSOR]);
 841
 842         cursor_x = cx;
 843         cursor_y = cy;
 844         if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
 845                 write_cursor(cursor_x, cursor_y);
 846 }
 847
 848 void tb_put_cell(int x, int y, const struct tb_cell *cell)
 849 {
 850         if ((unsigned)x >= (unsigned)back_buffer.width)
 851                 return;
 852         if ((unsigned)y >= (unsigned)back_buffer.height)
 853                 return;
 854         CELL(&back_buffer, x, y) = *cell;
 855 }
 856
 857 void tb_change_cell(int x, int y, uint32_t ch, uint16_t fg, uint16_t bg)
 858 {
 859         struct tb_cell c = {ch, fg, bg};
 860         tb_put_cell(x, y, &c);
 861 }
 862
 863 void tb_blit(int x, int y, int w, int h, const struct tb_cell *cells)
 864 {
 865         if (x + w < 0 || x >= back_buffer.width)
 866                 return;
 867         if (y + h < 0 || y >= back_buffer.height)
 868                 return;
 869         int xo = 0, yo = 0, ww = w, hh = h;
 870         if (x < 0) {
 871                 xo = -x;
 872                 ww -= xo;
 873                 x = 0;
 874         }
 875         if (y < 0) {
 876                 yo = -y;
 877                 hh -= yo;
 878                 y = 0;
 879         }
 880         if (ww > back_buffer.width - x)
 881                 ww = back_buffer.width - x;
 882         if (hh > back_buffer.height - y)
 883                 hh = back_buffer.height - y;
 884
 885         int sy;
 886         struct tb_cell *dst = &CELL(&back_buffer, x, y);
 887         const struct tb_cell *src = cells + yo * w + xo;
 888         size_t size = sizeof(struct tb_cell) * ww;
 889
 890         for (sy = 0; sy < hh; ++sy) {
 891                 memcpy(dst, src, size);
 892                 dst += back_buffer.width;
 893                 src += w;
 894         }
 895 }
 896
 897 struct tb_cell *tb_cell_buffer(void)
 898 {
 899         return back_buffer.cells;
 900 }
 901
 902 int tb_poll_event(struct tb_event *event)
 903 {
 904         return wait_fill_event(event, 0);
 905 }
 906
 907 int tb_peek_event(struct tb_event *event, int timeout)
 908 {
 909         struct timeval tv;
 910         tv.tv_sec = timeout / 1000;
 911         tv.tv_usec = (timeout - (tv.tv_sec * 1000)) * 1000;
 912         return wait_fill_event(event, &tv);
 913 }
 914
 915 int tb_width(void)
 916 {
 917         return termw;
 918 }
 919
 920 int tb_height(void)
 921 {
 922         return termh;
 923 }
 924
 925 void tb_clear(void)
 926 {
 927         if (buffer_size_change_request) {
 928                 update_size();
 929                 buffer_size_change_request = 0;
 930         }
 931         cellbuf_clear(&back_buffer);
 932 }
 933
 934 int tb_select_input_mode(int mode)
 935 {
 936         if (mode) {
 937                 if ((mode & (TB_INPUT_ESC | TB_INPUT_ALT)) == 0)
 938                         mode |= TB_INPUT_ESC;
 939
 940                 /* technically termbox can handle that, but let's be nice and show here
 941                    what mode is actually used */
 942                 if ((mode & (TB_INPUT_ESC | TB_INPUT_ALT)) == (TB_INPUT_ESC | TB_INPUT_ALT))
 943                         mode &= ~TB_INPUT_ALT;
 944
 945                 inputmode = mode;
 946                 if (mode&TB_INPUT_MOUSE) {
 947                         bytebuffer_puts(&output_buffer, funcs[T_ENTER_MOUSE]);
 948                         bytebuffer_flush(&output_buffer, inout);
 949                 } else {
 950                         bytebuffer_puts(&output_buffer, funcs[T_EXIT_MOUSE]);
 951                         bytebuffer_flush(&output_buffer, inout);
 952                 }
 953         }
 954         return inputmode;
 955 }
 956
 957 int tb_select_output_mode(int mode)
 958 {
 959         if (mode)
 960                 outputmode = mode;
 961         return outputmode;
 962 }
 963
 964 void tb_set_clear_attributes(uint16_t fg, uint16_t bg)
 965 {
 966         foreground = fg;
 967         background = bg;
 968 }
 969
 970 /* -------------------------------------------------------- */
 971
 972 static int convertnum(uint32_t num, char* buf) {
 973         int i, l = 0;
 974         int ch;
 975         do {
 976                 buf[l++] = '0' + (num % 10);
 977                 num /= 10;
 978         } while (num);
 979         for(i = 0; i < l / 2; i++) {
 980                 ch = buf[i];
 981                 buf[i] = buf[l - 1 - i];
 982                 buf[l - 1 - i] = ch;
 983         }
 984         return l;
 985 }
 986
 987 #define WRITE_LITERAL(X) bytebuffer_append(&output_buffer, (X), sizeof(X)-1)
 988 #define WRITE_INT(X) bytebuffer_append(&output_buffer, buf, convertnum((X), buf))
 989
 990 static void write_cursor(int x, int y) {
 991         char buf[32];
 992         WRITE_LITERAL("\033[");
 993         WRITE_INT(y+1);
 994         WRITE_LITERAL(";");
 995         WRITE_INT(x+1);
 996         WRITE_LITERAL("H");
 997 }
 998
 999 static void write_sgr(uint16_t fg, uint16_t bg) {
1000         char buf[32];
1001
1002         if (fg == TB_DEFAULT && bg == TB_DEFAULT)
1003                 return;
1004
1005         switch (outputmode) {
1006         case TB_OUTPUT_256:
1007         case TB_OUTPUT_216:
1008         case TB_OUTPUT_GRAYSCALE:
1009                 WRITE_LITERAL("\033[");
1010                 if (fg != TB_DEFAULT) {
1011                         WRITE_LITERAL("38;5;");
1012                         WRITE_INT(fg);
1013                         if (bg != TB_DEFAULT) {
1014                                 WRITE_LITERAL(";");
1015                         }
1016                 }
1017                 if (bg != TB_DEFAULT) {
1018                         WRITE_LITERAL("48;5;");
1019                         WRITE_INT(bg);
1020                 }
1021                 WRITE_LITERAL("m");
1022                 break;
1023         case TB_OUTPUT_NORMAL:
1024         default:
1025                 WRITE_LITERAL("\033[");
1026                 if (fg != TB_DEFAULT) {
1027                         WRITE_LITERAL("3");
1028                         WRITE_INT(fg - 1);
1029                         if (bg != TB_DEFAULT) {
1030                                 WRITE_LITERAL(";");
1031                         }
1032                 }
1033                 if (bg != TB_DEFAULT) {
1034                         WRITE_LITERAL("4");
1035                         WRITE_INT(bg - 1);
1036                 }
1037                 WRITE_LITERAL("m");
1038                 break;
1039         }
1040 }
1041
1042 static void cellbuf_init(struct cellbuf *buf, int width, int height)
1043 {
1044         buf->cells = (struct tb_cell*)malloc(sizeof(struct tb_cell) * width * height);
1045         assert(buf->cells);
1046         buf->width = width;
1047         buf->height = height;
1048 }
1049
1050 static void cellbuf_resize(struct cellbuf *buf, int width, int height)
1051 {
1052         if (buf->width == width && buf->height == height)
1053                 return;
1054
1055         int oldw = buf->width;
1056         int oldh = buf->height;
1057         struct tb_cell *oldcells = buf->cells;
1058
1059         cellbuf_init(buf, width, height);
1060         cellbuf_clear(buf);
1061
1062         int minw = (width < oldw) ? width : oldw;
1063         int minh = (height < oldh) ? height : oldh;
1064         int i;
1065
1066         for (i = 0; i < minh; ++i) {
1067                 struct tb_cell *csrc = oldcells + (i * oldw);
1068                 struct tb_cell *cdst = buf->cells + (i * width);
1069                 memcpy(cdst, csrc, sizeof(struct tb_cell) * minw);
1070         }
1071
1072         free(oldcells);
1073 }
1074
1075 static void cellbuf_clear(struct cellbuf *buf)
1076 {
1077         int i;
1078         int ncells = buf->width * buf->height;
1079
1080         for (i = 0; i < ncells; ++i) {
1081                 buf->cells[i].ch = ' ';
1082                 buf->cells[i].fg = foreground;
1083                 buf->cells[i].bg = background;
1084         }
1085 }
1086
1087 static void cellbuf_free(struct cellbuf *buf)
1088 {
1089         free(buf->cells);
1090 }
1091
1092 static void get_term_size(int *w, int *h)
1093 {
1094         struct winsize sz;
1095         memset(&sz, 0, sizeof(sz));
1096
1097         ioctl(inout, TIOCGWINSZ, &sz);
1098
1099         if (w) *w = sz.ws_col;
1100         if (h) *h = sz.ws_row;
1101 }
1102
1103 static void update_term_size(void)
1104 {
1105         struct winsize sz;
1106         memset(&sz, 0, sizeof(sz));
1107
1108         ioctl(inout, TIOCGWINSZ, &sz);
1109
1110         termw = sz.ws_col;
1111         termh = sz.ws_row;
1112 }
1113
1114 static void send_attr(uint16_t fg, uint16_t bg)
1115 {
1116 #define LAST_ATTR_INIT 0xFFFF
1117         static uint16_t lastfg = LAST_ATTR_INIT, lastbg = LAST_ATTR_INIT;
1118         if (fg != lastfg || bg != lastbg) {
1119                 bytebuffer_puts(&output_buffer, funcs[T_SGR0]);
1120
1121                 uint16_t fgcol;
1122                 uint16_t bgcol;
1123
1124                 switch (outputmode) {
1125                 case TB_OUTPUT_256:
1126                         fgcol = fg & 0xFF;
1127                         bgcol = bg & 0xFF;
1128                         break;
1129
1130                 case TB_OUTPUT_216:
1131                         fgcol = fg & 0xFF; if (fgcol > 215) fgcol = 7;
1132                         bgcol = bg & 0xFF; if (bgcol > 215) bgcol = 0;
1133                         fgcol += 0x10;
1134                         bgcol += 0x10;
1135                         break;
1136
1137                 case TB_OUTPUT_GRAYSCALE:
1138                         fgcol = fg & 0xFF; if (fgcol > 23) fgcol = 23;
1139                         bgcol = bg & 0xFF; if (bgcol > 23) bgcol = 0;
1140                         fgcol += 0xe8;
1141                         bgcol += 0xe8;
1142                         break;
1143
1144                 case TB_OUTPUT_NORMAL:
1145                 default:
1146                         fgcol = fg & 0x0F;
1147                         bgcol = bg & 0x0F;
1148                 }
1149
1150                 if (fg & TB_BOLD)
1151                         bytebuffer_puts(&output_buffer, funcs[T_BOLD]);
1152                 if (bg & TB_BOLD)
1153                         bytebuffer_puts(&output_buffer, funcs[T_BLINK]);
1154                 if (fg & TB_UNDERLINE)
1155                         bytebuffer_puts(&output_buffer, funcs[T_UNDERLINE]);
1156                 if ((fg & TB_REVERSE) || (bg & TB_REVERSE))
1157                         bytebuffer_puts(&output_buffer, funcs[T_REVERSE]);
1158
1159                 write_sgr(fgcol, bgcol);
1160
1161                 lastfg = fg;
1162                 lastbg = bg;
1163         }
1164 }
1165
1166 static void send_char(int x, int y, uint32_t c)
1167 {
1168         char buf[7];
1169         int bw = tb_utf8_unicode_to_char(buf, c);
1170         if (x-1 != lastx || y != lasty)
1171                 write_cursor(x, y);
1172         lastx = x; lasty = y;
1173         if(!c) buf[0] = ' '; // replace 0 with whitespace
1174         bytebuffer_append(&output_buffer, buf, bw);
1175 }
1176
1177 static void send_clear(void)
1178 {
1179         send_attr(foreground, background);
1180         bytebuffer_puts(&output_buffer, funcs[T_CLEAR_SCREEN]);
1181         if (!IS_CURSOR_HIDDEN(cursor_x, cursor_y))
1182                 write_cursor(cursor_x, cursor_y);
1183         bytebuffer_flush(&output_buffer, inout);
1184
1185         /* we need to invalidate cursor position too and these two vars are
1186          * used only for simple cursor positioning optimization, cursor
1187          * actually may be in the correct place, but we simply discard
1188          * optimization once and it gives us simple solution for the case when
1189          * cursor moved */
1190         lastx = LAST_COORD_INIT;
1191         lasty = LAST_COORD_INIT;
1192 }
1193
1194 static void sigwinch_handler(int xxx)
1195 {
1196         (void) xxx;
1197         const int zzz = 1;
1198         (void)write(winch_fds[1], &zzz, sizeof(int));
1199 }
1200
1201 static void update_size(void)
1202 {
1203         update_term_size();
1204         cellbuf_resize(&back_buffer, termw, termh);
1205         cellbuf_resize(&front_buffer, termw, termh);
1206         cellbuf_clear(&front_buffer);
1207         send_clear();
1208 }
1209
1210 static int read_up_to(int n) {
1211         assert(n > 0);
1212         const int prevlen = input_buffer.len;
1213         bytebuffer_resize(&input_buffer, prevlen + n);
1214
1215         int read_n = 0;
1216         while (read_n <= n) {
1217                 ssize_t r = 0;
1218                 if (read_n < n) {
1219                         r = read(inout, input_buffer.buf + prevlen + read_n, n - read_n);
1220                 }
1221 #ifdef __CYGWIN__
1222                 // While linux man for tty says when VMIN == 0 && VTIME == 0, read
1223                 // should return 0 when there is nothing to read, cygwin's read returns
1224                 // -1. Not sure why and if it's correct to ignore it, but let's pretend
1225                 // it's zero.
1226                 if (r < 0) r = 0;
1227 #endif
1228                 if (r < 0) {
1229                         // EAGAIN / EWOULDBLOCK shouldn't occur here
1230                         assert(errno != EAGAIN && errno != EWOULDBLOCK);
1231                         return -1;
1232                 } else if (r > 0) {
1233                         read_n += r;
1234                 } else {
1235                         bytebuffer_resize(&input_buffer, prevlen + read_n);
1236                         return read_n;
1237                 }
1238         }
1239         assert(!"unreachable");
1240         return 0;
1241 }
1242
1243 static int wait_fill_event(struct tb_event *event, struct timeval *timeout)
1244 {
1245         // ;-)
1246 #define ENOUGH_DATA_FOR_PARSING 64
1247         fd_set events;
1248         memset(event, 0, sizeof(struct tb_event));
1249
1250         // try to extract event from input buffer, return on success
1251         event->type = TB_EVENT_KEY;
1252         if (extract_event(event, &input_buffer))
1253                 return event->type;
1254
1255         // it looks like input buffer is incomplete, let's try the short path,
1256         // but first make sure there is enough space
1257         int n = read_up_to(ENOUGH_DATA_FOR_PARSING);
1258         if (n < 0)
1259                 return -1;
1260         if (n > 0 && extract_event(event, &input_buffer))
1261                 return event->type;
1262
1263         // n == 0, or not enough data, let's go to select
1264         while (1) {
1265                 FD_ZERO(&events);
1266                 FD_SET(inout, &events);
1267                 FD_SET(winch_fds[0], &events);
1268                 int maxfd = (winch_fds[0] > inout) ? winch_fds[0] : inout;
1269                 int result = select(maxfd+1, &events, 0, 0, timeout);
1270                 if (!result)
1271                         return 0;
1272
1273                 if (FD_ISSET(inout, &events)) {
1274                         event->type = TB_EVENT_KEY;
1275                         n = read_up_to(ENOUGH_DATA_FOR_PARSING);
1276                         if (n < 0)
1277                                 return -1;
1278
1279                         if (n == 0)
1280                                 continue;
1281
1282                         if (extract_event(event, &input_buffer))
1283                                 return event->type;
1284                 }
1285                 if (FD_ISSET(winch_fds[0], &events)) {
1286                         event->type = TB_EVENT_RESIZE;
1287                         int zzz = 0;
1288                         (void)read(winch_fds[0], &zzz, sizeof(int));
1289                         buffer_size_change_request = 1;
1290                         get_term_size(&event->w, &event->h);
1291                         return TB_EVENT_RESIZE;
1292                 }
1293         }
1294 }