1/* SPDX-License-Identifier: BSD-2-Clause */
2
3/* Copyright (C) 2022-2026 Mintsuki and contributors.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifdef __cplusplus
29#error "Please do not compile Flanterm as C++ code! Flanterm should be compiled as C99 or newer."
30#endif
31
32#ifndef __STDC_VERSION__
33#error "Flanterm must be compiled as C99 or newer."
34#endif
35
36#include <stdint.h>
37#include <stddef.h>
38#include <stdbool.h>
39
40#ifndef FLANTERM_IN_FLANTERM
41#define FLANTERM_IN_FLANTERM
42#endif
43
44#include "flanterm.h"
45
46// Tries to implement this standard for terminfo
47// https://man7.org/linux/man-pages/man4/console_codes.4.html
48
49static const uint32_t col256[] = {
50 0x000000, 0x00005f, 0x000087, 0x0000af, 0x0000d7, 0x0000ff, 0x005f00, 0x005f5f,
51 0x005f87, 0x005faf, 0x005fd7, 0x005fff, 0x008700, 0x00875f, 0x008787, 0x0087af,
52 0x0087d7, 0x0087ff, 0x00af00, 0x00af5f, 0x00af87, 0x00afaf, 0x00afd7, 0x00afff,
53 0x00d700, 0x00d75f, 0x00d787, 0x00d7af, 0x00d7d7, 0x00d7ff, 0x00ff00, 0x00ff5f,
54 0x00ff87, 0x00ffaf, 0x00ffd7, 0x00ffff, 0x5f0000, 0x5f005f, 0x5f0087, 0x5f00af,
55 0x5f00d7, 0x5f00ff, 0x5f5f00, 0x5f5f5f, 0x5f5f87, 0x5f5faf, 0x5f5fd7, 0x5f5fff,
56 0x5f8700, 0x5f875f, 0x5f8787, 0x5f87af, 0x5f87d7, 0x5f87ff, 0x5faf00, 0x5faf5f,
57 0x5faf87, 0x5fafaf, 0x5fafd7, 0x5fafff, 0x5fd700, 0x5fd75f, 0x5fd787, 0x5fd7af,
58 0x5fd7d7, 0x5fd7ff, 0x5fff00, 0x5fff5f, 0x5fff87, 0x5fffaf, 0x5fffd7, 0x5fffff,
59 0x870000, 0x87005f, 0x870087, 0x8700af, 0x8700d7, 0x8700ff, 0x875f00, 0x875f5f,
60 0x875f87, 0x875faf, 0x875fd7, 0x875fff, 0x878700, 0x87875f, 0x878787, 0x8787af,
61 0x8787d7, 0x8787ff, 0x87af00, 0x87af5f, 0x87af87, 0x87afaf, 0x87afd7, 0x87afff,
62 0x87d700, 0x87d75f, 0x87d787, 0x87d7af, 0x87d7d7, 0x87d7ff, 0x87ff00, 0x87ff5f,
63 0x87ff87, 0x87ffaf, 0x87ffd7, 0x87ffff, 0xaf0000, 0xaf005f, 0xaf0087, 0xaf00af,
64 0xaf00d7, 0xaf00ff, 0xaf5f00, 0xaf5f5f, 0xaf5f87, 0xaf5faf, 0xaf5fd7, 0xaf5fff,
65 0xaf8700, 0xaf875f, 0xaf8787, 0xaf87af, 0xaf87d7, 0xaf87ff, 0xafaf00, 0xafaf5f,
66 0xafaf87, 0xafafaf, 0xafafd7, 0xafafff, 0xafd700, 0xafd75f, 0xafd787, 0xafd7af,
67 0xafd7d7, 0xafd7ff, 0xafff00, 0xafff5f, 0xafff87, 0xafffaf, 0xafffd7, 0xafffff,
68 0xd70000, 0xd7005f, 0xd70087, 0xd700af, 0xd700d7, 0xd700ff, 0xd75f00, 0xd75f5f,
69 0xd75f87, 0xd75faf, 0xd75fd7, 0xd75fff, 0xd78700, 0xd7875f, 0xd78787, 0xd787af,
70 0xd787d7, 0xd787ff, 0xd7af00, 0xd7af5f, 0xd7af87, 0xd7afaf, 0xd7afd7, 0xd7afff,
71 0xd7d700, 0xd7d75f, 0xd7d787, 0xd7d7af, 0xd7d7d7, 0xd7d7ff, 0xd7ff00, 0xd7ff5f,
72 0xd7ff87, 0xd7ffaf, 0xd7ffd7, 0xd7ffff, 0xff0000, 0xff005f, 0xff0087, 0xff00af,
73 0xff00d7, 0xff00ff, 0xff5f00, 0xff5f5f, 0xff5f87, 0xff5faf, 0xff5fd7, 0xff5fff,
74 0xff8700, 0xff875f, 0xff8787, 0xff87af, 0xff87d7, 0xff87ff, 0xffaf00, 0xffaf5f,
75 0xffaf87, 0xffafaf, 0xffafd7, 0xffafff, 0xffd700, 0xffd75f, 0xffd787, 0xffd7af,
76 0xffd7d7, 0xffd7ff, 0xffff00, 0xffff5f, 0xffff87, 0xffffaf, 0xffffd7, 0xffffff,
77 0x080808, 0x121212, 0x1c1c1c, 0x262626, 0x303030, 0x3a3a3a, 0x444444, 0x4e4e4e,
78 0x585858, 0x626262, 0x6c6c6c, 0x767676, 0x808080, 0x8a8a8a, 0x949494, 0x9e9e9e,
79 0xa8a8a8, 0xb2b2b2, 0xbcbcbc, 0xc6c6c6, 0xd0d0d0, 0xdadada, 0xe4e4e4, 0xeeeeee
80};
81
82#define CHARSET_DEFAULT 0
83#define CHARSET_DEC_SPECIAL 1
84
85void flanterm_context_reinit(struct flanterm_context *ctx) {
86 ctx->tab_size = 8;
87 ctx->autoflush = true;
88 ctx->cursor_enabled = true;
89 ctx->scroll_enabled = true;
90 ctx->wrap_enabled = true;
91 ctx->origin_mode = false;
92 ctx->control_sequence = false;
93 ctx->escape = false;
94 ctx->osc = false;
95 ctx->osc_escape = false;
96 ctx->rrr = false;
97 ctx->discard_next = false;
98 ctx->bold = false;
99 ctx->bg_bold = false;
100 ctx->reverse_video = false;
101 ctx->dec_private = false;
102 ctx->insert_mode = false;
103 ctx->csi_unhandled = false;
104 ctx->unicode_remaining = 0;
105 ctx->g_select = 0;
106 ctx->charsets[0] = CHARSET_DEFAULT;
107 ctx->charsets[1] = CHARSET_DEC_SPECIAL;
108 ctx->current_charset = 0;
109 ctx->escape_offset = 0;
110 ctx->esc_values_i = 0;
111 ctx->saved_cursor_x = 0;
112 ctx->saved_cursor_y = 0;
113 ctx->current_primary = (size_t)-1;
114 ctx->current_bg = (size_t)-1;
115 ctx->saved_state_charsets[0] = CHARSET_DEFAULT;
116 ctx->saved_state_charsets[1] = CHARSET_DEC_SPECIAL;
117 ctx->saved_state_wrap_enabled = true;
118 ctx->saved_state_current_primary = (size_t)-1;
119 ctx->saved_state_current_bg = (size_t)-1;
120 ctx->saved_state_scroll_top_margin = 0;
121 ctx->saved_state_scroll_bottom_margin = ctx->rows;
122 ctx->last_printed_char = ' ';
123 ctx->last_was_graphic = false;
124 ctx->scroll_top_margin = 0;
125 ctx->scroll_bottom_margin = ctx->rows;
126}
127
128static void flanterm_putchar(struct flanterm_context *ctx, uint8_t c);
129
130void flanterm_write(struct flanterm_context *ctx, const char *buf, size_t count) {
131 for (size_t i = 0; i < count; i++) {
132 flanterm_putchar(ctx, c: buf[i]);
133 }
134
135 if (ctx->autoflush) {
136 ctx->double_buffer_flush(ctx);
137 }
138}
139
140static void sgr(struct flanterm_context *ctx) {
141 size_t i = 0;
142
143 if (!ctx->esc_values_i)
144 goto def;
145
146 for (; i < ctx->esc_values_i; i++) {
147 size_t offset;
148
149 if (ctx->esc_values[i] == 0) {
150def:
151 if (ctx->reverse_video) {
152 ctx->reverse_video = false;
153 ctx->swap_palette(ctx);
154 }
155 ctx->bold = false;
156 ctx->bg_bold = false;
157 ctx->current_primary = (size_t)-1;
158 ctx->current_bg = (size_t)-1;
159 ctx->set_text_bg_default(ctx);
160 ctx->set_text_fg_default(ctx);
161 continue;
162 }
163
164 else if (ctx->esc_values[i] == 1) {
165 ctx->bold = true;
166 if (ctx->current_primary == (size_t)-2) {
167 // RGB/256-color; bold does not alter the colour
168 } else if (ctx->current_primary != (size_t)-1) {
169 if (!ctx->reverse_video) {
170 ctx->set_text_fg_bright(ctx, ctx->current_primary);
171 } else {
172 ctx->set_text_bg_bright(ctx, ctx->current_primary);
173 }
174 } else {
175 if (!ctx->reverse_video) {
176 ctx->set_text_fg_default_bright(ctx);
177 } else {
178 ctx->set_text_bg_default_bright(ctx);
179 }
180 }
181 continue;
182 }
183
184 else if (ctx->esc_values[i] == 2
185 || ctx->esc_values[i] == 3
186 || ctx->esc_values[i] == 4
187 || ctx->esc_values[i] == 8) {
188 continue;
189 }
190
191 else if (ctx->esc_values[i] == 5) {
192 ctx->bg_bold = true;
193 if (ctx->current_bg == (size_t)-2) {
194 // RGB/256-color; bold does not alter the colour
195 } else if (ctx->current_bg != (size_t)-1) {
196 if (!ctx->reverse_video) {
197 ctx->set_text_bg_bright(ctx, ctx->current_bg);
198 } else {
199 ctx->set_text_fg_bright(ctx, ctx->current_bg);
200 }
201 } else {
202 if (!ctx->reverse_video) {
203 ctx->set_text_bg_default_bright(ctx);
204 } else {
205 ctx->set_text_fg_default_bright(ctx);
206 }
207 }
208 continue;
209 }
210
211 else if (ctx->esc_values[i] == 22) {
212 ctx->bold = false;
213 if (ctx->current_primary == (size_t)-2) {
214 // RGB/256-color; unbold does not alter the colour
215 } else if (ctx->current_primary != (size_t)-1) {
216 if (!ctx->reverse_video) {
217 ctx->set_text_fg(ctx, ctx->current_primary);
218 } else {
219 ctx->set_text_bg(ctx, ctx->current_primary);
220 }
221 } else {
222 if (!ctx->reverse_video) {
223 ctx->set_text_fg_default(ctx);
224 } else {
225 ctx->set_text_bg_default(ctx);
226 }
227 }
228 continue;
229 }
230
231 else if (ctx->esc_values[i] == 23
232 || ctx->esc_values[i] == 24
233 || ctx->esc_values[i] == 28) {
234 continue;
235 }
236
237 else if (ctx->esc_values[i] == 25) {
238 ctx->bg_bold = false;
239 if (ctx->current_bg == (size_t)-2) {
240 // RGB/256-color; unbold does not alter the colour
241 } else if (ctx->current_bg != (size_t)-1) {
242 if (!ctx->reverse_video) {
243 ctx->set_text_bg(ctx, ctx->current_bg);
244 } else {
245 ctx->set_text_fg(ctx, ctx->current_bg);
246 }
247 } else {
248 if (!ctx->reverse_video) {
249 ctx->set_text_bg_default(ctx);
250 } else {
251 ctx->set_text_fg_default(ctx);
252 }
253 }
254 continue;
255 }
256
257 else if (ctx->esc_values[i] >= 30 && ctx->esc_values[i] <= 37) {
258 offset = 30;
259 ctx->current_primary = ctx->esc_values[i] - offset;
260
261 if (ctx->reverse_video) {
262 goto set_bg;
263 }
264
265set_fg:
266 if ((ctx->bold && !ctx->reverse_video)
267 || (ctx->bg_bold && ctx->reverse_video)) {
268 ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
269 } else {
270 ctx->set_text_fg(ctx, ctx->esc_values[i] - offset);
271 }
272 continue;
273 }
274
275 else if (ctx->esc_values[i] >= 40 && ctx->esc_values[i] <= 47) {
276 offset = 40;
277 ctx->current_bg = ctx->esc_values[i] - offset;
278
279 if (ctx->reverse_video) {
280 goto set_fg;
281 }
282
283set_bg:
284 if ((ctx->bold && ctx->reverse_video)
285 || (ctx->bg_bold && !ctx->reverse_video)) {
286 ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
287 } else {
288 ctx->set_text_bg(ctx, ctx->esc_values[i] - offset);
289 }
290 continue;
291 }
292
293 else if (ctx->esc_values[i] >= 90 && ctx->esc_values[i] <= 97) {
294 offset = 90;
295 ctx->current_primary = ctx->esc_values[i] - offset;
296
297 if (ctx->reverse_video) {
298 goto set_bg_bright;
299 }
300
301set_fg_bright:
302 ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
303 continue;
304 }
305
306 else if (ctx->esc_values[i] >= 100 && ctx->esc_values[i] <= 107) {
307 offset = 100;
308 ctx->current_bg = ctx->esc_values[i] - offset;
309
310 if (ctx->reverse_video) {
311 goto set_fg_bright;
312 }
313
314set_bg_bright:
315 ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
316 continue;
317 }
318
319 else if (ctx->esc_values[i] == 39) {
320 ctx->current_primary = (size_t)-1;
321
322 if (ctx->reverse_video) {
323 ctx->swap_palette(ctx);
324 }
325
326 if (!ctx->bold) {
327 ctx->set_text_fg_default(ctx);
328 } else {
329 ctx->set_text_fg_default_bright(ctx);
330 }
331
332 if (ctx->reverse_video) {
333 ctx->swap_palette(ctx);
334 }
335
336 continue;
337 }
338
339 else if (ctx->esc_values[i] == 49) {
340 ctx->current_bg = (size_t)-1;
341
342 if (ctx->reverse_video) {
343 ctx->swap_palette(ctx);
344 }
345
346 if (!ctx->bg_bold) {
347 ctx->set_text_bg_default(ctx);
348 } else {
349 ctx->set_text_bg_default_bright(ctx);
350 }
351
352 if (ctx->reverse_video) {
353 ctx->swap_palette(ctx);
354 }
355
356 continue;
357 }
358
359 else if (ctx->esc_values[i] == 7) {
360 if (!ctx->reverse_video) {
361 ctx->reverse_video = true;
362 ctx->swap_palette(ctx);
363 }
364 continue;
365 }
366
367 else if (ctx->esc_values[i] == 27) {
368 if (ctx->reverse_video) {
369 ctx->reverse_video = false;
370 ctx->swap_palette(ctx);
371 }
372 continue;
373 }
374
375 // 256/RGB
376 else if (ctx->esc_values[i] == 38 || ctx->esc_values[i] == 48) {
377 bool fg = ctx->esc_values[i] == 38;
378 bool render_fg = ctx->reverse_video ? !fg : fg;
379
380 i++;
381 if (i >= ctx->esc_values_i) {
382 break;
383 }
384
385 switch (ctx->esc_values[i]) {
386 case 2: { // RGB
387 if (i + 3 >= ctx->esc_values_i) {
388 goto out;
389 }
390
391 uint32_t rgb_value = 0;
392
393 rgb_value |= (ctx->esc_values[i + 1] & 0xff) << 16;
394 rgb_value |= (ctx->esc_values[i + 2] & 0xff) << 8;
395 rgb_value |= (ctx->esc_values[i + 3] & 0xff);
396
397 i += 3;
398
399 if (fg) {
400 ctx->current_primary = (size_t)-2;
401 } else {
402 ctx->current_bg = (size_t)-2;
403 }
404
405 (render_fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
406
407 break;
408 }
409 case 5: { // 256 colors
410 if (i + 1 >= ctx->esc_values_i) {
411 goto out;
412 }
413
414 uint32_t col = ctx->esc_values[i + 1];
415
416 i++;
417
418 if (col < 8) {
419 if (fg) {
420 ctx->current_primary = (size_t)-2;
421 } else {
422 ctx->current_bg = (size_t)-2;
423 }
424 (render_fg ? ctx->set_text_fg : ctx->set_text_bg)(ctx, col);
425 } else if (col < 16) {
426 if (fg) {
427 ctx->current_primary = (size_t)-2;
428 } else {
429 ctx->current_bg = (size_t)-2;
430 }
431 (render_fg ? ctx->set_text_fg_bright : ctx->set_text_bg_bright)(ctx, col - 8);
432 } else if (col < 256) {
433 if (fg) {
434 ctx->current_primary = (size_t)-2;
435 } else {
436 ctx->current_bg = (size_t)-2;
437 }
438 uint32_t rgb_value = col256[col - 16];
439 (render_fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
440 }
441
442 break;
443 }
444 default: continue;
445 }
446 }
447 }
448
449out:;
450}
451
452static void save_state(struct flanterm_context *ctx);
453static void restore_state(struct flanterm_context *ctx);
454
455static void dec_private_parse(struct flanterm_context *ctx, uint8_t c) {
456 ctx->dec_private = false;
457
458 if (ctx->esc_values_i == 0) {
459 return;
460 }
461
462 bool set;
463
464 switch (c) {
465 case 'h':
466 set = true; break;
467 case 'l':
468 set = false; break;
469 default:
470 return;
471 }
472
473 for (size_t i = 0; i < ctx->esc_values_i; i++) {
474 switch (ctx->esc_values[i]) {
475 case 6:
476 ctx->origin_mode = set;
477 ctx->set_cursor_pos(ctx, 0, set ? ctx->scroll_top_margin : 0);
478 break;
479 case 7:
480 ctx->wrap_enabled = set;
481 break;
482 case 25:
483 ctx->cursor_enabled = set;
484 break;
485 case 1049:
486 if (set) {
487 save_state(ctx);
488 ctx->scroll_top_margin = 0;
489 ctx->scroll_bottom_margin = ctx->rows;
490 ctx->clear(ctx, true);
491 } else {
492 ctx->clear(ctx, true);
493 restore_state(ctx);
494 }
495 break;
496 }
497 }
498
499 if (ctx->callback != NULL) {
500 ctx->callback(ctx, FLANTERM_CB_DEC, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
501 }
502}
503
504static void linux_private_parse(struct flanterm_context *ctx) {
505 if (ctx->esc_values_i == 0) {
506 return;
507 }
508
509 if (ctx->callback != NULL) {
510 ctx->callback(ctx, FLANTERM_CB_LINUX, ctx->esc_values_i, (uintptr_t)ctx->esc_values, 0);
511 }
512}
513
514static void mode_toggle(struct flanterm_context *ctx, uint8_t c) {
515 if (ctx->esc_values_i == 0) {
516 return;
517 }
518
519 bool set;
520
521 switch (c) {
522 case 'h':
523 set = true; break;
524 case 'l':
525 set = false; break;
526 default:
527 return;
528 }
529
530 switch (ctx->esc_values[0]) {
531 case 4:
532 ctx->insert_mode = set; return;
533 }
534
535 if (ctx->callback != NULL) {
536 ctx->callback(ctx, FLANTERM_CB_MODE, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
537 }
538}
539
540static void osc_finalize(struct flanterm_context *ctx) {
541 if (ctx->callback != NULL) {
542 // Parse the leading OSC number and skip past the semicolon.
543 uint64_t osc_num = 0;
544 size_t i = 0;
545 while (i < ctx->osc_buf_i && ctx->osc_buf[i] >= '0' && ctx->osc_buf[i] <= '9') {
546 osc_num = osc_num * 10 + (ctx->osc_buf[i] - '0');
547 i++;
548 }
549 if (i < ctx->osc_buf_i && ctx->osc_buf[i] == ';') {
550 i++;
551 }
552 ctx->callback(ctx, FLANTERM_CB_OSC, osc_num, ctx->osc_buf_i - i, (uintptr_t)&ctx->osc_buf[i]);
553 }
554}
555
556static bool osc_parse(struct flanterm_context *ctx, uint8_t c) {
557 // ESC \ terminates an OSC sequence cleanly
558 // but if ESC is followed by non-\, report failure from osc_parse and
559 // try parsing the character as another escape code
560 if (ctx->osc_escape) {
561 if (c == '\\') {
562 osc_finalize(ctx);
563 ctx->osc = false;
564 ctx->osc_escape = false;
565 ctx->escape = false;
566 return true;
567 } else {
568 ctx->osc_escape = false;
569 ctx->osc = false;
570 // escape stays true here
571 return false;
572 }
573 }
574 switch (c) {
575 case 0x1b:
576 ctx->osc_escape = true;
577 break;
578 // BEL is the other terminator
579 case '\a':
580 osc_finalize(ctx);
581 ctx->osc_escape = false;
582 ctx->osc = false;
583 ctx->escape = false;
584 break;
585 default:
586 if (ctx->osc_buf_i < sizeof(ctx->osc_buf)) {
587 ctx->osc_buf[ctx->osc_buf_i++] = c;
588 }
589 break;
590 }
591 return true;
592}
593
594static bool execute_c0(struct flanterm_context *ctx, uint8_t c) {
595 size_t x, y;
596 switch (c) {
597 case '\a':
598 if (ctx->callback != NULL) {
599 ctx->callback(ctx, FLANTERM_CB_BELL, 0, 0, 0);
600 }
601 return true;
602 case '\b':
603 ctx->get_cursor_pos(ctx, &x, &y);
604 if (x > 0) {
605 ctx->set_cursor_pos(ctx, x - 1, y);
606 }
607 return true;
608 case '\t':
609 ctx->get_cursor_pos(ctx, &x, &y);
610 x = (x / ctx->tab_size + 1) * ctx->tab_size;
611 if (x >= ctx->cols) {
612 x = ctx->cols - 1;
613 }
614 ctx->set_cursor_pos(ctx, x, y);
615 return true;
616 case 0x0b:
617 case 0x0c:
618 case '\n':
619 ctx->get_cursor_pos(ctx, &x, &y);
620 if (y == ctx->scroll_bottom_margin - 1) {
621 ctx->scroll(ctx);
622 ctx->set_cursor_pos(ctx, x, y);
623 } else if (y < ctx->rows - 1) {
624 ctx->set_cursor_pos(ctx, x, y + 1);
625 }
626 return true;
627 case '\r':
628 ctx->get_cursor_pos(ctx, &x, &y);
629 ctx->set_cursor_pos(ctx, 0, y);
630 return true;
631 case 14:
632 ctx->current_charset = 1;
633 return true;
634 case 15:
635 ctx->current_charset = 0;
636 return true;
637 default:
638 return false;
639 }
640}
641
642static void control_sequence_parse(struct flanterm_context *ctx, uint8_t c) {
643 if (ctx->escape_offset == 2) {
644 switch (c) {
645 case '[':
646 ctx->discard_next = true;
647 goto cleanup;
648 case '?':
649 ctx->dec_private = true;
650 return;
651 }
652 }
653
654 if (c < 0x20 && c != 0x1b) {
655 execute_c0(ctx, c);
656 return;
657 }
658
659 if (c >= '0' && c <= '9') {
660 if (ctx->esc_values_i == FLANTERM_MAX_ESC_VALUES) {
661 return;
662 }
663 ctx->rrr = true;
664 if (ctx->esc_values[ctx->esc_values_i] > UINT32_MAX / 10) {
665 return;
666 }
667 ctx->esc_values[ctx->esc_values_i] *= 10;
668 uint32_t digit = c - '0';
669 if (ctx->esc_values[ctx->esc_values_i] > UINT32_MAX - digit) {
670 ctx->esc_values[ctx->esc_values_i] = UINT32_MAX;
671 return;
672 }
673 ctx->esc_values[ctx->esc_values_i] += digit;
674 return;
675 }
676
677 if (ctx->rrr == true) {
678 ctx->esc_values_i++;
679 ctx->rrr = false;
680 if (c == ';')
681 return;
682 } else if (c == ';') {
683 if (ctx->esc_values_i == FLANTERM_MAX_ESC_VALUES) {
684 return;
685 }
686 ctx->esc_values[ctx->esc_values_i] = 0;
687 ctx->esc_values_i++;
688 return;
689 }
690
691 size_t esc_default;
692 switch (c) {
693 case 'J': case 'K': case 'q': case 'm': case 'c': case ']':
694 esc_default = 0; break;
695 default:
696 esc_default = 1; break;
697 }
698
699 for (size_t i = ctx->esc_values_i; i < FLANTERM_MAX_ESC_VALUES; i++) {
700 ctx->esc_values[i] = esc_default;
701 }
702
703 if (esc_default != 0) {
704 for (size_t i = 0; i < ctx->esc_values_i; i++) {
705 if (ctx->esc_values[i] == 0) {
706 ctx->esc_values[i] = esc_default;
707 }
708 }
709 }
710
711 if (ctx->dec_private == true) {
712 dec_private_parse(ctx, c);
713 goto cleanup;
714 }
715
716 // CSI sequences are terminated by a byte in [0x40,0x7E]
717 // so skip all bytes until the terminator byte
718 if (ctx->csi_unhandled) {
719 if (c == 0x1B) {
720 ctx->csi_unhandled = false;
721 ctx->control_sequence = false;
722 ctx->escape_offset = 0;
723 return;
724 }
725 if (c >= 0x40 && c <= 0x7E) {
726 ctx->csi_unhandled = false;
727 goto cleanup;
728 }
729 return;
730 }
731
732 bool r = ctx->scroll_enabled;
733 ctx->scroll_enabled = false;
734 bool saved_wrap = ctx->wrap_enabled;
735 ctx->wrap_enabled = true;
736 size_t x, y;
737 ctx->get_cursor_pos(ctx, &x, &y);
738
739 switch (c) {
740 // ESC aborts the current CSI and starts a new escape sequence
741 case 0x1B:
742 ctx->scroll_enabled = r;
743 ctx->wrap_enabled = saved_wrap;
744 ctx->control_sequence = false;
745 ctx->escape_offset = 0;
746 return;
747 case 'F':
748 x = 0;
749 // FALLTHRU
750 case 'A': {
751 if (ctx->esc_values[0] > y)
752 ctx->esc_values[0] = y;
753 size_t dest_y = y - ctx->esc_values[0];
754 size_t min_y = ctx->origin_mode ? ctx->scroll_top_margin : 0;
755 if (dest_y < min_y) {
756 dest_y = min_y;
757 }
758 ctx->set_cursor_pos(ctx, x, dest_y);
759 break;
760 }
761 case 'E':
762 x = 0;
763 // FALLTHRU
764 case 'e':
765 case 'B': {
766 if (y + ctx->esc_values[0] > ctx->rows - 1)
767 ctx->esc_values[0] = (ctx->rows - 1) - y;
768 size_t dest_y = y + ctx->esc_values[0];
769 size_t max_y = ctx->origin_mode ? ctx->scroll_bottom_margin : ctx->rows;
770 if (dest_y >= max_y) {
771 dest_y = max_y - 1;
772 }
773 ctx->set_cursor_pos(ctx, x, dest_y);
774 break;
775 }
776 case 'a':
777 case 'C':
778 if (x + ctx->esc_values[0] > ctx->cols - 1)
779 ctx->esc_values[0] = (ctx->cols - 1) - x;
780 ctx->set_cursor_pos(ctx, x + ctx->esc_values[0], y);
781 break;
782 case 'D':
783 if (ctx->esc_values[0] > x)
784 ctx->esc_values[0] = x;
785 ctx->set_cursor_pos(ctx, x - ctx->esc_values[0], y);
786 break;
787 case 'c':
788 if (ctx->callback != NULL) {
789 ctx->callback(ctx, FLANTERM_CB_PRIVATE_ID, 0, 0, 0);
790 }
791 break;
792 case 'd': {
793 if (ctx->esc_values[0] != 0) {
794 ctx->esc_values[0]--;
795 }
796 size_t max_row = ctx->rows;
797 size_t row_offset = 0;
798 if (ctx->origin_mode) {
799 max_row = ctx->scroll_bottom_margin - ctx->scroll_top_margin;
800 row_offset = ctx->scroll_top_margin;
801 }
802 if (ctx->esc_values[0] >= max_row)
803 ctx->esc_values[0] = max_row - 1;
804 ctx->set_cursor_pos(ctx, x, ctx->esc_values[0] + row_offset);
805 break;
806 }
807 case 'G':
808 case '`':
809 if (ctx->esc_values[0] != 0) {
810 ctx->esc_values[0]--;
811 }
812 if (ctx->esc_values[0] >= ctx->cols)
813 ctx->esc_values[0] = ctx->cols - 1;
814 ctx->set_cursor_pos(ctx, ctx->esc_values[0], y);
815 break;
816 case 'H':
817 case 'f': {
818 if (ctx->esc_values[0] != 0) {
819 ctx->esc_values[0]--;
820 }
821 if (ctx->esc_values[1] != 0) {
822 ctx->esc_values[1]--;
823 }
824 size_t max_row = ctx->rows;
825 size_t row_offset = 0;
826 if (ctx->origin_mode) {
827 max_row = ctx->scroll_bottom_margin - ctx->scroll_top_margin;
828 row_offset = ctx->scroll_top_margin;
829 }
830 if (ctx->esc_values[1] >= ctx->cols) {
831 ctx->esc_values[1] = ctx->cols - 1;
832 }
833 if (ctx->esc_values[0] >= max_row) {
834 ctx->esc_values[0] = max_row - 1;
835 }
836 ctx->set_cursor_pos(ctx, ctx->esc_values[1], ctx->esc_values[0] + row_offset);
837 break;
838 }
839 case 'M': {
840 if (y < ctx->scroll_top_margin || y >= ctx->scroll_bottom_margin) {
841 break;
842 }
843 size_t old_scroll_top_margin = ctx->scroll_top_margin;
844 ctx->scroll_top_margin = y;
845 size_t max_count = ctx->scroll_bottom_margin - y;
846 size_t count = ctx->esc_values[0] > max_count ? max_count : ctx->esc_values[0];
847 for (size_t i = 0; i < count; i++) {
848 ctx->scroll(ctx);
849 }
850 ctx->scroll_top_margin = old_scroll_top_margin;
851 break;
852 }
853 case 'L': {
854 if (y < ctx->scroll_top_margin || y >= ctx->scroll_bottom_margin) {
855 break;
856 }
857 size_t old_scroll_top_margin = ctx->scroll_top_margin;
858 ctx->scroll_top_margin = y;
859 size_t max_count = ctx->scroll_bottom_margin - y;
860 size_t count = ctx->esc_values[0] > max_count ? max_count : ctx->esc_values[0];
861 for (size_t i = 0; i < count; i++) {
862 ctx->revscroll(ctx);
863 }
864 ctx->scroll_top_margin = old_scroll_top_margin;
865 break;
866 }
867 case 'n':
868 switch (ctx->esc_values[0]) {
869 case 5:
870 if (ctx->callback != NULL) {
871 ctx->callback(ctx, FLANTERM_CB_STATUS_REPORT, 0, 0, 0);
872 }
873 break;
874 case 6:
875 if (ctx->callback != NULL) {
876 size_t report_y = ctx->origin_mode && y >= ctx->scroll_top_margin
877 ? y - ctx->scroll_top_margin : y;
878 ctx->callback(ctx, FLANTERM_CB_POS_REPORT, x + 1, report_y + 1, 0);
879 }
880 break;
881 }
882 break;
883 case 'q':
884 if (ctx->callback != NULL) {
885 ctx->callback(ctx, FLANTERM_CB_KBD_LEDS, ctx->esc_values[0], 0, 0);
886 }
887 break;
888 case 'J':
889 switch (ctx->esc_values[0]) {
890 case 0: {
891 // Erase from cursor to end: clear rest of current line,
892 // then clear full lines below, using explicit cursor
893 // positioning to avoid scroll region wrapping limits.
894 ctx->set_cursor_pos(ctx, x, y);
895 for (size_t xc = x; xc < ctx->cols; xc++) {
896 ctx->raw_putchar(ctx, ' ');
897 }
898 for (size_t yc = y + 1; yc < ctx->rows; yc++) {
899 ctx->set_cursor_pos(ctx, 0, yc);
900 for (size_t xc = 0; xc < ctx->cols; xc++) {
901 ctx->raw_putchar(ctx, ' ');
902 }
903 }
904 ctx->set_cursor_pos(ctx, x, y);
905 break;
906 }
907 case 1: {
908 // Erase from start to cursor: clear full lines above,
909 // then clear current line up to and including cursor.
910 for (size_t yc = 0; yc < y; yc++) {
911 ctx->set_cursor_pos(ctx, 0, yc);
912 for (size_t xc = 0; xc < ctx->cols; xc++) {
913 ctx->raw_putchar(ctx, ' ');
914 }
915 }
916 ctx->set_cursor_pos(ctx, 0, y);
917 for (size_t xc = 0; xc <= x; xc++) {
918 ctx->raw_putchar(ctx, ' ');
919 }
920 ctx->set_cursor_pos(ctx, x, y);
921 break;
922 }
923 case 2:
924 case 3:
925 ctx->clear(ctx, false);
926 break;
927 }
928 break;
929 case '@': {
930 size_t n = ctx->esc_values[0];
931 if (n == 0) {
932 break;
933 }
934 if (n > ctx->cols - x) {
935 n = ctx->cols - x;
936 }
937 for (size_t i = ctx->cols - 1; i >= x + n; i--) {
938 ctx->move_character(ctx, i, y, i - n, y);
939 }
940 ctx->set_cursor_pos(ctx, x, y);
941 for (size_t i = 0; i < n; i++) {
942 ctx->raw_putchar(ctx, ' ');
943 }
944 ctx->set_cursor_pos(ctx, x, y);
945 break;
946 }
947 case 'P':
948 if (ctx->esc_values[0] > ctx->cols - x)
949 ctx->esc_values[0] = ctx->cols - x;
950 for (size_t i = x + ctx->esc_values[0]; i < ctx->cols; i++)
951 ctx->move_character(ctx, i - ctx->esc_values[0], y, i, y);
952 ctx->set_cursor_pos(ctx, ctx->cols - ctx->esc_values[0], y);
953 // FALLTHRU
954 case 'X': {
955 size_t cx, cy;
956 ctx->get_cursor_pos(ctx, &cx, &cy);
957 ctx->set_cursor_pos(ctx, cx, cy);
958 size_t remaining = ctx->cols - cx;
959 size_t count = ctx->esc_values[0] > remaining ? remaining : ctx->esc_values[0];
960 for (size_t i = 0; i < count; i++)
961 ctx->raw_putchar(ctx, ' ');
962 ctx->set_cursor_pos(ctx, x, y);
963 break;
964 }
965 case 'm':
966 sgr(ctx);
967 break;
968 case 's':
969 ctx->get_cursor_pos(ctx, &ctx->saved_cursor_x, &ctx->saved_cursor_y);
970 break;
971 case 'u':
972 ctx->set_cursor_pos(ctx, ctx->saved_cursor_x, ctx->saved_cursor_y);
973 break;
974 case 'K':
975 switch (ctx->esc_values[0]) {
976 case 0: {
977 ctx->set_cursor_pos(ctx, x, y);
978 for (size_t i = x; i < ctx->cols; i++)
979 ctx->raw_putchar(ctx, ' ');
980 ctx->set_cursor_pos(ctx, x, y);
981 break;
982 }
983 case 1: {
984 ctx->set_cursor_pos(ctx, 0, y);
985 for (size_t i = 0; i <= x; i++)
986 ctx->raw_putchar(ctx, ' ');
987 ctx->set_cursor_pos(ctx, x, y);
988 break;
989 }
990 case 2: {
991 ctx->set_cursor_pos(ctx, 0, y);
992 for (size_t i = 0; i < ctx->cols; i++)
993 ctx->raw_putchar(ctx, ' ');
994 ctx->set_cursor_pos(ctx, x, y);
995 break;
996 }
997 }
998 break;
999 case 'r':
1000 ctx->scroll_top_margin = 0;
1001 ctx->scroll_bottom_margin = ctx->rows;
1002 if (ctx->esc_values_i > 0) {
1003 ctx->scroll_top_margin = ctx->esc_values[0] - 1;
1004 }
1005 if (ctx->esc_values_i > 1) {
1006 ctx->scroll_bottom_margin = ctx->esc_values[1];
1007 }
1008 if (ctx->scroll_top_margin >= ctx->rows
1009 || ctx->scroll_bottom_margin > ctx->rows
1010 || ctx->scroll_top_margin >= (ctx->scroll_bottom_margin - 1)) {
1011 ctx->scroll_top_margin = 0;
1012 ctx->scroll_bottom_margin = ctx->rows;
1013 }
1014 ctx->set_cursor_pos(ctx, 0, ctx->origin_mode ? ctx->scroll_top_margin : 0);
1015 break;
1016 case 'l':
1017 case 'h':
1018 mode_toggle(ctx, c);
1019 break;
1020 case 'S': {
1021 size_t region = ctx->scroll_bottom_margin - ctx->scroll_top_margin;
1022 size_t count = ctx->esc_values[0] > region ? region : ctx->esc_values[0];
1023 for (size_t i = 0; i < count; i++) {
1024 ctx->scroll(ctx);
1025 }
1026 break;
1027 }
1028 case 'T': {
1029 size_t region = ctx->scroll_bottom_margin - ctx->scroll_top_margin;
1030 size_t count = ctx->esc_values[0] > region ? region : ctx->esc_values[0];
1031 for (size_t i = 0; i < count; i++) {
1032 ctx->revscroll(ctx);
1033 }
1034 break;
1035 }
1036 case 'b': {
1037 if (!ctx->last_was_graphic) {
1038 break;
1039 }
1040 ctx->scroll_enabled = r;
1041 ctx->wrap_enabled = saved_wrap;
1042 size_t count = ctx->esc_values[0] > 65535 ? 65535 : ctx->esc_values[0];
1043 for (size_t i = 0; i < count; i++) {
1044 if (ctx->insert_mode == true) {
1045 size_t ix, iy;
1046 ctx->get_cursor_pos(ctx, &ix, &iy);
1047 for (size_t j = ctx->cols - 1; j > ix; j--) {
1048 ctx->move_character(ctx, j, iy, j - 1, iy);
1049 }
1050 }
1051 ctx->raw_putchar(ctx, ctx->last_printed_char);
1052 }
1053 break;
1054 }
1055 case ']':
1056 linux_private_parse(ctx);
1057 break;
1058 default:
1059 if (c >= 0x40 && c <= 0x7E) {
1060 break;
1061 }
1062 ctx->scroll_enabled = r;
1063 ctx->wrap_enabled = saved_wrap;
1064 ctx->csi_unhandled = true;
1065 return;
1066 }
1067
1068 ctx->scroll_enabled = r;
1069 ctx->wrap_enabled = saved_wrap;
1070
1071cleanup:
1072 ctx->control_sequence = false;
1073 ctx->escape = false;
1074}
1075
1076static void restore_state(struct flanterm_context *ctx) {
1077 ctx->bold = ctx->saved_state_bold;
1078 ctx->bg_bold = ctx->saved_state_bg_bold;
1079 ctx->reverse_video = ctx->saved_state_reverse_video;
1080 ctx->origin_mode = ctx->saved_state_origin_mode;
1081 ctx->wrap_enabled = ctx->saved_state_wrap_enabled;
1082 ctx->current_charset = ctx->saved_state_current_charset;
1083 ctx->charsets[0] = ctx->saved_state_charsets[0];
1084 ctx->charsets[1] = ctx->saved_state_charsets[1];
1085 ctx->current_primary = ctx->saved_state_current_primary;
1086 ctx->current_bg = ctx->saved_state_current_bg;
1087 ctx->scroll_top_margin = ctx->saved_state_scroll_top_margin;
1088 ctx->scroll_bottom_margin = ctx->saved_state_scroll_bottom_margin;
1089
1090 ctx->restore_state(ctx);
1091}
1092
1093static void save_state(struct flanterm_context *ctx) {
1094 ctx->save_state(ctx);
1095
1096 ctx->saved_state_bold = ctx->bold;
1097 ctx->saved_state_bg_bold = ctx->bg_bold;
1098 ctx->saved_state_reverse_video = ctx->reverse_video;
1099 ctx->saved_state_origin_mode = ctx->origin_mode;
1100 ctx->saved_state_wrap_enabled = ctx->wrap_enabled;
1101 ctx->saved_state_current_charset = ctx->current_charset;
1102 ctx->saved_state_charsets[0] = ctx->charsets[0];
1103 ctx->saved_state_charsets[1] = ctx->charsets[1];
1104 ctx->saved_state_current_primary = ctx->current_primary;
1105 ctx->saved_state_current_bg = ctx->current_bg;
1106 ctx->saved_state_scroll_top_margin = ctx->scroll_top_margin;
1107 ctx->saved_state_scroll_bottom_margin = ctx->scroll_bottom_margin;
1108}
1109
1110static void escape_parse(struct flanterm_context *ctx, uint8_t c) {
1111 ctx->escape_offset++;
1112
1113 if (ctx->osc == true) {
1114 // ESC \ is one of the two possible terminators of OSC sequences,
1115 // so osc_parse consumes ESC.
1116 // If it is then followed by \ it cleans correctly,
1117 // otherwise it returns false, and it tries parsing it as another escape sequence
1118 if (osc_parse(ctx, c)) {
1119 return;
1120 }
1121 // OSC aborted by ESC + non-backslash; reset offset for new sequence
1122 ctx->escape_offset = 1;
1123 }
1124
1125 if (ctx->control_sequence == true) {
1126 control_sequence_parse(ctx, c);
1127 return;
1128 }
1129
1130 size_t x, y;
1131 ctx->get_cursor_pos(ctx, &x, &y);
1132
1133 switch (c) {
1134 case 0x1b:
1135 ctx->escape_offset = 0;
1136 return;
1137 case ']':
1138 ctx->osc_escape = false;
1139 ctx->osc = true;
1140 ctx->osc_buf_i = 0;
1141 return;
1142 case '[':
1143 for (size_t i = 0; i < FLANTERM_MAX_ESC_VALUES; i++)
1144 ctx->esc_values[i] = 0;
1145 ctx->esc_values_i = 0;
1146 ctx->rrr = false;
1147 ctx->csi_unhandled = false;
1148 ctx->control_sequence = true;
1149 return;
1150 case '7':
1151 save_state(ctx);
1152 break;
1153 case '8':
1154 restore_state(ctx);
1155 break;
1156 case 'c':
1157 if (ctx->reverse_video) {
1158 ctx->swap_palette(ctx);
1159 }
1160 flanterm_context_reinit(ctx);
1161 ctx->set_text_bg_default(ctx);
1162 ctx->set_text_fg_default(ctx);
1163 ctx->clear(ctx, true);
1164 save_state(ctx);
1165 break;
1166 case 'D':
1167 if (y == ctx->scroll_bottom_margin - 1) {
1168 ctx->scroll(ctx);
1169 ctx->set_cursor_pos(ctx, x, y);
1170 } else if (y < ctx->rows - 1) {
1171 ctx->set_cursor_pos(ctx, x, y + 1);
1172 }
1173 break;
1174 case 'E':
1175 if (y == ctx->scroll_bottom_margin - 1) {
1176 ctx->scroll(ctx);
1177 ctx->set_cursor_pos(ctx, 0, y);
1178 } else if (y < ctx->rows - 1) {
1179 ctx->set_cursor_pos(ctx, 0, y + 1);
1180 } else {
1181 ctx->set_cursor_pos(ctx, 0, y);
1182 }
1183 break;
1184 case 'M':
1185 // "Reverse linefeed"
1186 if (y == ctx->scroll_top_margin) {
1187 ctx->revscroll(ctx);
1188 ctx->set_cursor_pos(ctx, x, y);
1189 } else if (y > 0) {
1190 ctx->set_cursor_pos(ctx, x, y - 1);
1191 }
1192 break;
1193 case 'Z':
1194 if (ctx->callback != NULL) {
1195 ctx->callback(ctx, FLANTERM_CB_PRIVATE_ID, 0, 0, 0);
1196 }
1197 break;
1198 case '(':
1199 case ')':
1200 ctx->g_select = c - '\'';
1201 break;
1202 }
1203
1204 ctx->escape = false;
1205}
1206
1207static bool dec_special_print(struct flanterm_context *ctx, uint8_t c) {
1208#define FLANTERM_DEC_SPCL_PRN(C) ctx->last_printed_char = (C); ctx->last_was_graphic = true; ctx->raw_putchar(ctx, (C)); return true;
1209 switch (c) {
1210 case '`': FLANTERM_DEC_SPCL_PRN(0x04)
1211 case '0': FLANTERM_DEC_SPCL_PRN(0xdb)
1212 case '-': FLANTERM_DEC_SPCL_PRN(0x18)
1213 case ',': FLANTERM_DEC_SPCL_PRN(0x1b)
1214 case '.': FLANTERM_DEC_SPCL_PRN(0x19)
1215 case 'a': FLANTERM_DEC_SPCL_PRN(0xb1)
1216 case 'f': FLANTERM_DEC_SPCL_PRN(0xf8)
1217 case 'g': FLANTERM_DEC_SPCL_PRN(0xf1)
1218 case 'h': FLANTERM_DEC_SPCL_PRN(0xb0)
1219 case 'j': FLANTERM_DEC_SPCL_PRN(0xd9)
1220 case 'k': FLANTERM_DEC_SPCL_PRN(0xbf)
1221 case 'l': FLANTERM_DEC_SPCL_PRN(0xda)
1222 case 'm': FLANTERM_DEC_SPCL_PRN(0xc0)
1223 case 'n': FLANTERM_DEC_SPCL_PRN(0xc5)
1224 case 'q': FLANTERM_DEC_SPCL_PRN(0xc4)
1225 case 's': FLANTERM_DEC_SPCL_PRN(0x5f)
1226 case 't': FLANTERM_DEC_SPCL_PRN(0xc3)
1227 case 'u': FLANTERM_DEC_SPCL_PRN(0xb4)
1228 case 'v': FLANTERM_DEC_SPCL_PRN(0xc1)
1229 case 'w': FLANTERM_DEC_SPCL_PRN(0xc2)
1230 case 'x': FLANTERM_DEC_SPCL_PRN(0xb3)
1231 case 'y': FLANTERM_DEC_SPCL_PRN(0xf3)
1232 case 'z': FLANTERM_DEC_SPCL_PRN(0xf2)
1233 case '~': FLANTERM_DEC_SPCL_PRN(0xfa)
1234 case '_': FLANTERM_DEC_SPCL_PRN(0xff)
1235 case '+': FLANTERM_DEC_SPCL_PRN(0x1a)
1236 case '{': FLANTERM_DEC_SPCL_PRN(0xe3)
1237 case '}': FLANTERM_DEC_SPCL_PRN(0x9c)
1238 }
1239#undef FLANTERM_DEC_SPCL_PRN
1240
1241 return false;
1242}
1243
1244// Following wcwidth related code inherited from:
1245// https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1246
1247struct interval {
1248 uint32_t first;
1249 uint32_t last;
1250};
1251
1252/* auxiliary function for binary search in interval table */
1253static int bisearch(uint32_t ucs, const struct interval *table, int max) {
1254 int min = 0;
1255 int mid;
1256
1257 if (ucs < table[0].first || ucs > table[max].last)
1258 return 0;
1259 while (max >= min) {
1260 mid = (min + max) / 2;
1261 if (ucs > table[mid].last)
1262 min = mid + 1;
1263 else if (ucs < table[mid].first)
1264 max = mid - 1;
1265 else
1266 return 1;
1267 }
1268
1269 return 0;
1270}
1271
1272static int mk_wcwidth(uint32_t ucs) {
1273 /* sorted list of non-overlapping intervals of zero-width characters */
1274 /* Unicode 17.0.0 */
1275 static const struct interval combining[] = {
1276 { 0x0300, 0x036F }, { 0x0483, 0x0489 }, { 0x0591, 0x05BD },
1277 { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, { 0x05C4, 0x05C5 },
1278 { 0x05C7, 0x05C7 }, { 0x0610, 0x061A }, { 0x061C, 0x061C },
1279 { 0x064B, 0x065F }, { 0x0670, 0x0670 }, { 0x06D6, 0x06DC },
1280 { 0x06DF, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
1281 { 0x0711, 0x0711 }, { 0x0730, 0x074A }, { 0x07A6, 0x07B0 },
1282 { 0x07EB, 0x07F3 }, { 0x07FD, 0x07FD }, { 0x0816, 0x0819 },
1283 { 0x081B, 0x0823 }, { 0x0825, 0x0827 }, { 0x0829, 0x082D },
1284 { 0x0859, 0x085B }, { 0x0897, 0x089F }, { 0x08CA, 0x08E1 },
1285 { 0x08E3, 0x0902 }, { 0x093A, 0x093A }, { 0x093C, 0x093C },
1286 { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0957 },
1287 { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
1288 { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
1289 { 0x09FE, 0x09FE }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
1290 { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
1291 { 0x0A51, 0x0A51 }, { 0x0A70, 0x0A71 }, { 0x0A75, 0x0A75 },
1292 { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 },
1293 { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0AE2, 0x0AE3 },
1294 { 0x0AFA, 0x0AFF }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
1295 { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B44 }, { 0x0B4D, 0x0B4D },
1296 { 0x0B55, 0x0B56 }, { 0x0B62, 0x0B63 }, { 0x0B82, 0x0B82 },
1297 { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C00, 0x0C00 },
1298 { 0x0C04, 0x0C04 }, { 0x0C3C, 0x0C3C }, { 0x0C3E, 0x0C40 },
1299 { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
1300 { 0x0C62, 0x0C63 }, { 0x0C81, 0x0C81 }, { 0x0CBC, 0x0CBC },
1301 { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
1302 { 0x0CE2, 0x0CE3 }, { 0x0D00, 0x0D01 }, { 0x0D3B, 0x0D3C },
1303 { 0x0D41, 0x0D44 }, { 0x0D4D, 0x0D4D }, { 0x0D62, 0x0D63 },
1304 { 0x0D81, 0x0D81 }, { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 },
1305 { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A },
1306 { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EBC },
1307 { 0x0EC8, 0x0ECE }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
1308 { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
1309 { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F8D, 0x0F97 },
1310 { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
1311 { 0x1032, 0x1037 }, { 0x1039, 0x103A }, { 0x103D, 0x103E },
1312 { 0x1058, 0x1059 }, { 0x105E, 0x1060 }, { 0x1071, 0x1074 },
1313 { 0x1082, 0x1082 }, { 0x1085, 0x1086 }, { 0x108D, 0x108D },
1314 { 0x109D, 0x109D }, { 0x1160, 0x11FF }, { 0x135D, 0x135F },
1315 { 0x1712, 0x1714 }, { 0x1732, 0x1733 }, { 0x1752, 0x1753 },
1316 { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
1317 { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
1318 { 0x180B, 0x180F }, { 0x1885, 0x1886 }, { 0x18A9, 0x18A9 },
1319 { 0x1920, 0x1922 }, { 0x1927, 0x1928 }, { 0x1932, 0x1932 },
1320 { 0x1939, 0x193B }, { 0x1A17, 0x1A18 }, { 0x1A1B, 0x1A1B },
1321 { 0x1A56, 0x1A56 }, { 0x1A58, 0x1A5E }, { 0x1A60, 0x1A60 },
1322 { 0x1A62, 0x1A62 }, { 0x1A65, 0x1A6C }, { 0x1A73, 0x1A7C },
1323 { 0x1A7F, 0x1A7F }, { 0x1AB0, 0x1ADD }, { 0x1AE0, 0x1AEB },
1324 { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 }, { 0x1B36, 0x1B3A },
1325 { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 }, { 0x1B6B, 0x1B73 },
1326 { 0x1B80, 0x1B81 }, { 0x1BA2, 0x1BA5 }, { 0x1BA8, 0x1BA9 },
1327 { 0x1BAB, 0x1BAD }, { 0x1BE6, 0x1BE6 }, { 0x1BE8, 0x1BE9 },
1328 { 0x1BED, 0x1BED }, { 0x1BEF, 0x1BF1 }, { 0x1C2C, 0x1C33 },
1329 { 0x1C36, 0x1C37 }, { 0x1CD0, 0x1CD2 }, { 0x1CD4, 0x1CE0 },
1330 { 0x1CE2, 0x1CE8 }, { 0x1CED, 0x1CED }, { 0x1CF4, 0x1CF4 },
1331 { 0x1CF8, 0x1CF9 }, { 0x1DC0, 0x1DFF }, { 0x200B, 0x200F },
1332 { 0x2028, 0x202E }, { 0x2060, 0x206F }, { 0x20D0, 0x20F0 },
1333 { 0x2CEF, 0x2CF1 }, { 0x2D7F, 0x2D7F }, { 0x2DE0, 0x2DFF },
1334 { 0x302A, 0x302D }, { 0x3099, 0x309A }, { 0x3164, 0x3164 },
1335 { 0xA66F, 0xA672 }, { 0xA674, 0xA67D }, { 0xA69E, 0xA69F },
1336 { 0xA6F0, 0xA6F1 }, { 0xA802, 0xA802 }, { 0xA806, 0xA806 },
1337 { 0xA80B, 0xA80B }, { 0xA825, 0xA826 }, { 0xA82C, 0xA82C },
1338 { 0xA8C4, 0xA8C5 }, { 0xA8E0, 0xA8F1 }, { 0xA8FF, 0xA8FF },
1339 { 0xA926, 0xA92D }, { 0xA947, 0xA951 }, { 0xA980, 0xA982 },
1340 { 0xA9B3, 0xA9B3 }, { 0xA9B6, 0xA9B9 }, { 0xA9BC, 0xA9BD },
1341 { 0xA9E5, 0xA9E5 }, { 0xAA29, 0xAA2E }, { 0xAA31, 0xAA32 },
1342 { 0xAA35, 0xAA36 }, { 0xAA43, 0xAA43 }, { 0xAA4C, 0xAA4C },
1343 { 0xAA7C, 0xAA7C }, { 0xAAB0, 0xAAB0 }, { 0xAAB2, 0xAAB4 },
1344 { 0xAAB7, 0xAAB8 }, { 0xAABE, 0xAABF }, { 0xAAC1, 0xAAC1 },
1345 { 0xAAEC, 0xAAED }, { 0xAAF6, 0xAAF6 }, { 0xABE5, 0xABE5 },
1346 { 0xABE8, 0xABE8 }, { 0xABED, 0xABED }, { 0xD7B0, 0xD7FF },
1347 { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F }, { 0xFE20, 0xFE2F },
1348 { 0xFEFF, 0xFEFF }, { 0xFFA0, 0xFFA0 }, { 0xFFF0, 0xFFFB },
1349 { 0x101FD, 0x101FD }, { 0x102E0, 0x102E0 }, { 0x10376, 0x1037A },
1350 { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
1351 { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x10AE5, 0x10AE6 },
1352 { 0x10D24, 0x10D27 }, { 0x10D69, 0x10D6D }, { 0x10EAB, 0x10EAC },
1353 { 0x10EFA, 0x10EFF }, { 0x10F46, 0x10F50 }, { 0x10F82, 0x10F85 },
1354 { 0x11001, 0x11001 }, { 0x11038, 0x11046 }, { 0x11070, 0x11070 },
1355 { 0x11073, 0x11074 }, { 0x1107F, 0x11081 }, { 0x110B3, 0x110B6 },
1356 { 0x110B9, 0x110BA }, { 0x110C2, 0x110C2 }, { 0x11100, 0x11102 },
1357 { 0x11127, 0x1112B }, { 0x1112D, 0x11134 }, { 0x11173, 0x11173 },
1358 { 0x11180, 0x11181 }, { 0x111B6, 0x111BE }, { 0x111C9, 0x111CC },
1359 { 0x111CF, 0x111CF }, { 0x1122F, 0x11231 }, { 0x11234, 0x11234 },
1360 { 0x11236, 0x11237 }, { 0x1123E, 0x1123E }, { 0x11241, 0x11241 },
1361 { 0x112DF, 0x112DF }, { 0x112E3, 0x112EA }, { 0x11300, 0x11301 },
1362 { 0x1133B, 0x1133C }, { 0x11340, 0x11340 }, { 0x11366, 0x1136C },
1363 { 0x11370, 0x11374 }, { 0x113BB, 0x113C0 }, { 0x113CE, 0x113CE },
1364 { 0x113D0, 0x113D0 }, { 0x113D2, 0x113D2 }, { 0x113E1, 0x113E2 },
1365 { 0x11438, 0x1143F }, { 0x11442, 0x11444 }, { 0x11446, 0x11446 },
1366 { 0x1145E, 0x1145E }, { 0x114B3, 0x114B8 }, { 0x114BA, 0x114BA },
1367 { 0x114BF, 0x114C0 }, { 0x114C2, 0x114C3 }, { 0x115B2, 0x115B5 },
1368 { 0x115BC, 0x115BD }, { 0x115BF, 0x115C0 }, { 0x115DC, 0x115DD },
1369 { 0x11633, 0x1163A }, { 0x1163D, 0x1163D }, { 0x1163F, 0x11640 },
1370 { 0x116AB, 0x116AB }, { 0x116AD, 0x116AD }, { 0x116B0, 0x116B5 },
1371 { 0x116B7, 0x116B7 }, { 0x1171D, 0x1171D }, { 0x1171F, 0x1171F },
1372 { 0x11722, 0x11725 }, { 0x11727, 0x1172B }, { 0x1182F, 0x11837 },
1373 { 0x11839, 0x1183A }, { 0x1193B, 0x1193C }, { 0x1193E, 0x1193E },
1374 { 0x11943, 0x11943 }, { 0x119D4, 0x119D7 }, { 0x119DA, 0x119DB },
1375 { 0x119E0, 0x119E0 }, { 0x11A01, 0x11A0A }, { 0x11A33, 0x11A38 },
1376 { 0x11A3B, 0x11A3E }, { 0x11A47, 0x11A47 }, { 0x11A51, 0x11A56 },
1377 { 0x11A59, 0x11A5B }, { 0x11A8A, 0x11A96 }, { 0x11A98, 0x11A99 },
1378 { 0x11B60, 0x11B60 }, { 0x11B62, 0x11B64 }, { 0x11B66, 0x11B66 },
1379 { 0x11C30, 0x11C36 }, { 0x11C38, 0x11C3D }, { 0x11C3F, 0x11C3F },
1380 { 0x11C92, 0x11CA7 }, { 0x11CAA, 0x11CB0 }, { 0x11CB2, 0x11CB3 },
1381 { 0x11CB5, 0x11CB6 }, { 0x11D31, 0x11D36 }, { 0x11D3A, 0x11D3A },
1382 { 0x11D3C, 0x11D3D }, { 0x11D3F, 0x11D45 }, { 0x11D47, 0x11D47 },
1383 { 0x11D90, 0x11D91 }, { 0x11D95, 0x11D95 }, { 0x11D97, 0x11D97 },
1384 { 0x11EF3, 0x11EF4 }, { 0x11F00, 0x11F01 }, { 0x11F36, 0x11F3A },
1385 { 0x11F40, 0x11F40 }, { 0x11F42, 0x11F42 }, { 0x11F5A, 0x11F5A },
1386 { 0x13430, 0x13440 }, { 0x13447, 0x13455 }, { 0x1611E, 0x16129 },
1387 { 0x1612D, 0x1612F }, { 0x16AF0, 0x16AF4 }, { 0x16B30, 0x16B36 },
1388 { 0x16F4F, 0x16F4F }, { 0x16F8F, 0x16F92 }, { 0x16FE4, 0x16FE4 },
1389 { 0x1BC9D, 0x1BC9E }, { 0x1BCA0, 0x1BCA3 }, { 0x1CF00, 0x1CF2D },
1390 { 0x1CF30, 0x1CF46 }, { 0x1D167, 0x1D169 }, { 0x1D173, 0x1D182 },
1391 { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD }, { 0x1D242, 0x1D244 },
1392 { 0x1DA00, 0x1DA36 }, { 0x1DA3B, 0x1DA6C }, { 0x1DA75, 0x1DA75 },
1393 { 0x1DA84, 0x1DA84 }, { 0x1DA9B, 0x1DA9F }, { 0x1DAA1, 0x1DAAF },
1394 { 0x1E000, 0x1E006 }, { 0x1E008, 0x1E018 }, { 0x1E01B, 0x1E021 },
1395 { 0x1E023, 0x1E024 }, { 0x1E026, 0x1E02A }, { 0x1E08F, 0x1E08F },
1396 { 0x1E130, 0x1E136 }, { 0x1E2AE, 0x1E2AE }, { 0x1E2EC, 0x1E2EF },
1397 { 0x1E4EC, 0x1E4EF }, { 0x1E5EE, 0x1E5EF }, { 0x1E6E3, 0x1E6E3 },
1398 { 0x1E6E6, 0x1E6E6 }, { 0x1E6EE, 0x1E6EF }, { 0x1E6F5, 0x1E6F5 },
1399 { 0x1E8D0, 0x1E8D6 }, { 0x1E944, 0x1E94A }, { 0xE0000, 0xE0FFF }
1400 };
1401
1402 /* test for 8-bit control characters */
1403 if (ucs == 0)
1404 return 0;
1405 if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
1406 return -1;
1407
1408 /* binary search in table of non-spacing characters */
1409 if (bisearch(ucs, table: combining,
1410 max: sizeof(combining) / sizeof(struct interval) - 1))
1411 return 0;
1412
1413 /* sorted list of non-overlapping intervals of wide/fullwidth characters */
1414 /* Unicode 17.0.0 - East_Asian_Width W and F */
1415 static const struct interval wide[] = {
1416 { 0x1100, 0x115F }, { 0x231A, 0x231B }, { 0x2329, 0x232A },
1417 { 0x23E9, 0x23EC }, { 0x23F0, 0x23F0 }, { 0x23F3, 0x23F3 },
1418 { 0x25FD, 0x25FE }, { 0x2614, 0x2615 }, { 0x2630, 0x2637 },
1419 { 0x2648, 0x2653 }, { 0x267F, 0x267F }, { 0x268A, 0x268F },
1420 { 0x2693, 0x2693 }, { 0x26A1, 0x26A1 }, { 0x26AA, 0x26AB },
1421 { 0x26BD, 0x26BE }, { 0x26C4, 0x26C5 }, { 0x26CE, 0x26CE },
1422 { 0x26D4, 0x26D4 }, { 0x26EA, 0x26EA }, { 0x26F2, 0x26F3 },
1423 { 0x26F5, 0x26F5 }, { 0x26FA, 0x26FA }, { 0x26FD, 0x26FD },
1424 { 0x2705, 0x2705 }, { 0x270A, 0x270B }, { 0x2728, 0x2728 },
1425 { 0x274C, 0x274C }, { 0x274E, 0x274E }, { 0x2753, 0x2755 },
1426 { 0x2757, 0x2757 }, { 0x2795, 0x2797 }, { 0x27B0, 0x27B0 },
1427 { 0x27BF, 0x27BF }, { 0x2B1B, 0x2B1C }, { 0x2B50, 0x2B50 },
1428 { 0x2B55, 0x2B55 }, { 0x2E80, 0x2E99 }, { 0x2E9B, 0x2EF3 },
1429 { 0x2F00, 0x2FD5 }, { 0x2FF0, 0x303E }, { 0x3041, 0x3096 },
1430 { 0x3099, 0x30FF }, { 0x3105, 0x312F }, { 0x3131, 0x318E },
1431 { 0x3190, 0x31E5 }, { 0x31EF, 0x321E }, { 0x3220, 0x3247 },
1432 { 0x3250, 0xA48C }, { 0xA490, 0xA4C6 }, { 0xA960, 0xA97C },
1433 { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF }, { 0xFE10, 0xFE19 },
1434 { 0xFE30, 0xFE52 }, { 0xFE54, 0xFE66 }, { 0xFE68, 0xFE6B },
1435 { 0xFF01, 0xFF60 }, { 0xFFE0, 0xFFE6 },
1436 { 0x16FE0, 0x16FE4 }, { 0x16FF0, 0x16FF6 },
1437 { 0x17000, 0x18CD5 }, { 0x18CFF, 0x18D1E }, { 0x18D80, 0x18DF2 },
1438 { 0x1AFF0, 0x1AFF3 }, { 0x1AFF5, 0x1AFFB },
1439 { 0x1AFFD, 0x1AFFE }, { 0x1B000, 0x1B122 }, { 0x1B132, 0x1B132 },
1440 { 0x1B150, 0x1B152 }, { 0x1B155, 0x1B155 }, { 0x1B164, 0x1B167 },
1441 { 0x1B170, 0x1B2FB }, { 0x1D300, 0x1D356 }, { 0x1D360, 0x1D376 },
1442 { 0x1F004, 0x1F004 }, { 0x1F0CF, 0x1F0CF }, { 0x1F18E, 0x1F18E },
1443 { 0x1F191, 0x1F19A }, { 0x1F200, 0x1F202 }, { 0x1F210, 0x1F23B },
1444 { 0x1F240, 0x1F248 }, { 0x1F250, 0x1F251 }, { 0x1F260, 0x1F265 },
1445 { 0x1F300, 0x1F320 }, { 0x1F32D, 0x1F335 }, { 0x1F337, 0x1F37C },
1446 { 0x1F37E, 0x1F393 }, { 0x1F3A0, 0x1F3CA }, { 0x1F3CF, 0x1F3D3 },
1447 { 0x1F3E0, 0x1F3F0 }, { 0x1F3F4, 0x1F3F4 }, { 0x1F3F8, 0x1F43E },
1448 { 0x1F440, 0x1F440 }, { 0x1F442, 0x1F4FC }, { 0x1F4FF, 0x1F53D },
1449 { 0x1F54B, 0x1F54E }, { 0x1F550, 0x1F567 }, { 0x1F57A, 0x1F57A },
1450 { 0x1F595, 0x1F596 }, { 0x1F5A4, 0x1F5A4 }, { 0x1F5FB, 0x1F64F },
1451 { 0x1F680, 0x1F6C5 }, { 0x1F6CC, 0x1F6CC }, { 0x1F6D0, 0x1F6D2 },
1452 { 0x1F6D5, 0x1F6D8 }, { 0x1F6DC, 0x1F6DF }, { 0x1F6EB, 0x1F6EC },
1453 { 0x1F6F4, 0x1F6FC }, { 0x1F7E0, 0x1F7EB }, { 0x1F7F0, 0x1F7F0 },
1454 { 0x1F90C, 0x1F93A }, { 0x1F93C, 0x1F945 }, { 0x1F947, 0x1F9FF },
1455 { 0x1FA70, 0x1FA7C }, { 0x1FA80, 0x1FA8A }, { 0x1FA8E, 0x1FAC6 },
1456 { 0x1FAC8, 0x1FAC8 }, { 0x1FACD, 0x1FADC }, { 0x1FADF, 0x1FAEA },
1457 { 0x1FAEF, 0x1FAF8 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
1458 };
1459
1460 if (bisearch(ucs, table: wide,
1461 max: sizeof(wide) / sizeof(struct interval) - 1))
1462 return 2;
1463
1464 return 1;
1465}
1466
1467// End of https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c inherited code
1468
1469static int unicode_to_cp437(uint64_t code_point) {
1470 // Braille patterns U+2800-U+28FF: approximate using CP437 block/shade characters.
1471 // Braille dot layout (bit positions):
1472 // bit0 bit3 (row 0)
1473 // bit1 bit4 (row 1)
1474 // bit2 bit5 (row 2)
1475 // bit6 bit7 (row 3)
1476 if (code_point >= 0x2800 && code_point <= 0x28ff) {
1477 uint32_t dots = (uint32_t)(code_point - 0x2800);
1478
1479 if (dots == 0) return 0x20;
1480 if (dots == 0xff) return 0xdb;
1481
1482 bool has_top = dots & 0x1b;
1483 bool has_bottom = dots & 0xe4;
1484 bool has_left = dots & 0x47;
1485 bool has_right = dots & 0xb8;
1486
1487 if (has_top && !has_bottom) return 0xdf; // ▀
1488 if (has_bottom && !has_top) return 0xdc; // ▄
1489 if (has_left && !has_right) return 0xdd; // ▌
1490 if (has_right && !has_left) return 0xde; // ▐
1491
1492 // Count set bits for density-based shade
1493 uint32_t n = dots - ((dots >> 1) & 0x55);
1494 n = (n & 0x33) + ((n >> 2) & 0x33);
1495 n = (n + (n >> 4)) & 0x0f;
1496
1497 if (n <= 2) return 0xb0; // ░
1498 if (n <= 4) return 0xb1; // ▒
1499 if (n <= 6) return 0xb2; // ▓
1500 return 0xdb; // █
1501 }
1502
1503 switch (code_point) {
1504 case 0x263a: return 1;
1505 case 0x263b: return 2;
1506 case 0x2665: return 3;
1507 case 0x2666: return 4;
1508 case 0x25c6: return 4;
1509 case 0x2663: return 5;
1510 case 0x2660: return 6;
1511 case 0x2022: return 7;
1512 case 0x25d8: return 8;
1513 case 0x25cb: return 9;
1514 case 0x25d9: return 10;
1515 case 0x2642: return 11;
1516 case 0x2640: return 12;
1517 case 0x266a: return 13;
1518 case 0x266b: return 14;
1519 case 0x263c: return 15;
1520 case 0x00a4: return 15;
1521 case 0x25ba: return 16;
1522 case 0x25b6: return 16;
1523 case 0x25c4: return 17;
1524 case 0x25c0: return 17;
1525 case 0x2195: return 18;
1526 case 0x203c: return 19;
1527 case 0x00b6: return 20;
1528 case 0x00a7: return 21;
1529 case 0x25ac: return 22;
1530 case 0x21a8: return 23;
1531 case 0x2191: return 24;
1532 case 0x2193: return 25;
1533 case 0x2192: return 26;
1534 case 0x2190: return 27;
1535 case 0x221f: return 28;
1536 case 0x2194: return 29;
1537 case 0x25b2: return 30;
1538 case 0x25bc: return 31;
1539
1540 case 0x00a8: return 0x22;
1541 case 0x00b4: return 0x27;
1542 case 0x00b8: return 0x2c;
1543 case 0x00ad: return 0x2d;
1544 case 0x00c0: return 0x41;
1545 case 0x00c1: return 0x41;
1546 case 0x00c2: return 0x41;
1547 case 0x00c3: return 0x41;
1548 case 0x00a9: return 0x43;
1549 case 0x00d0: return 0x44;
1550 case 0x00c8: return 0x45;
1551 case 0x00ca: return 0x45;
1552 case 0x00cb: return 0x45;
1553 case 0x00cc: return 0x49;
1554 case 0x00cd: return 0x49;
1555 case 0x00ce: return 0x49;
1556 case 0x00cf: return 0x49;
1557 case 0x212a: return 0x4b;
1558 case 0x00d2: return 0x4f;
1559 case 0x00d3: return 0x4f;
1560 case 0x00d4: return 0x4f;
1561 case 0x00d5: return 0x4f;
1562 case 0x00ae: return 0x52;
1563 case 0x00d9: return 0x55;
1564 case 0x00da: return 0x55;
1565 case 0x00db: return 0x55;
1566 case 0x00dd: return 0x59;
1567 case 0x23bd: return 0x5f;
1568 case 0x00e3: return 0x61;
1569 case 0x00f5: return 0x6f;
1570 case 0x00d7: return 0x78;
1571 case 0x00fd: return 0x79;
1572 case 0x00a6: return 0x7c;
1573
1574 case 0x2302: return 127;
1575 case 0x00c7: return 128;
1576 case 0x00fc: return 129;
1577 case 0x00e9: return 130;
1578 case 0x00e2: return 131;
1579 case 0x00e4: return 132;
1580 case 0x00e0: return 133;
1581 case 0x00e5: return 134;
1582 case 0x00e7: return 135;
1583 case 0x00ea: return 136;
1584 case 0x00eb: return 137;
1585 case 0x00e8: return 138;
1586 case 0x00ef: return 139;
1587 case 0x00ee: return 140;
1588 case 0x00ec: return 141;
1589 case 0x00c4: return 142;
1590 case 0x00c5: return 143;
1591 case 0x212b: return 143;
1592 case 0x00c9: return 144;
1593 case 0x00e6: return 145;
1594 case 0x00c6: return 146;
1595 case 0x00f4: return 147;
1596 case 0x00f6: return 148;
1597 case 0x00f2: return 149;
1598 case 0x00fb: return 150;
1599 case 0x00f9: return 151;
1600 case 0x00ff: return 152;
1601 case 0x00d6: return 153;
1602 case 0x00dc: return 154;
1603 case 0x00a2: return 155;
1604 case 0x00a3: return 156;
1605 case 0x00a5: return 157;
1606 case 0x20a7: return 158;
1607 case 0x0192: return 159;
1608 case 0x00e1: return 160;
1609 case 0x00ed: return 161;
1610 case 0x00f3: return 162;
1611 case 0x00fa: return 163;
1612 case 0x00f1: return 164;
1613 case 0x00d1: return 165;
1614 case 0x00aa: return 166;
1615 case 0x00ba: return 167;
1616 case 0x00bf: return 168;
1617 case 0x2310: return 169;
1618 case 0x00ac: return 170;
1619 case 0x00bd: return 171;
1620 case 0x00bc: return 172;
1621 case 0x00a1: return 173;
1622 case 0x00ab: return 174;
1623 case 0x00bb: return 175;
1624 case 0x2591: return 176;
1625 case 0x2592: return 177;
1626 case 0x2593: return 178;
1627 case 0x2502: return 179;
1628 case 0x2524: return 180;
1629 case 0x2561: return 181;
1630 case 0x2562: return 182;
1631 case 0x2556: return 183;
1632 case 0x2555: return 184;
1633 case 0x2563: return 185;
1634 case 0x2551: return 186;
1635 case 0x2557: return 187;
1636 case 0x255d: return 188;
1637 case 0x255c: return 189;
1638 case 0x255b: return 190;
1639 case 0x2510: return 191;
1640 case 0x2514: return 192;
1641 case 0x2534: return 193;
1642 case 0x252c: return 194;
1643 case 0x251c: return 195;
1644 case 0x2500: return 196;
1645 case 0x253c: return 197;
1646 case 0x255e: return 198;
1647 case 0x255f: return 199;
1648 case 0x255a: return 200;
1649 case 0x2554: return 201;
1650 case 0x2569: return 202;
1651 case 0x2566: return 203;
1652 case 0x2560: return 204;
1653 case 0x2550: return 205;
1654 case 0x256c: return 206;
1655 case 0x2567: return 207;
1656 case 0x2568: return 208;
1657 case 0x2564: return 209;
1658 case 0x2565: return 210;
1659 case 0x2559: return 211;
1660 case 0x2558: return 212;
1661 case 0x2552: return 213;
1662 case 0x2553: return 214;
1663 case 0x256b: return 215;
1664 case 0x256a: return 216;
1665 case 0x2518: return 217;
1666 case 0x250c: return 218;
1667 case 0x2588: return 219;
1668 case 0x2584: return 220;
1669 case 0x258c: return 221;
1670 case 0x2590: return 222;
1671 case 0x2580: return 223;
1672 case 0x03b1: return 224;
1673 case 0x00df: return 225;
1674 case 0x03b2: return 225;
1675 case 0x0393: return 226;
1676 case 0x03c0: return 227;
1677 case 0x03a3: return 228;
1678 case 0x03c3: return 229;
1679 case 0x00b5: return 230;
1680 case 0x03bc: return 230;
1681 case 0x03c4: return 231;
1682 case 0x03a6: return 232;
1683 case 0x00d8: return 232;
1684 case 0x0398: return 233;
1685 case 0x03a9: return 234;
1686 case 0x2126: return 234;
1687 case 0x03b4: return 235;
1688 case 0x00f0: return 235;
1689 case 0x221e: return 236;
1690 case 0x03c6: return 237;
1691 case 0x00f8: return 237;
1692 case 0x03b5: return 238;
1693 case 0x2208: return 238;
1694 case 0x2229: return 239;
1695 case 0x2261: return 240;
1696 case 0x00b1: return 241;
1697 case 0x2265: return 242;
1698 case 0x2264: return 243;
1699 case 0x2320: return 244;
1700 case 0x2321: return 245;
1701 case 0x00f7: return 246;
1702 case 0x2248: return 247;
1703 case 0x00b0: return 248;
1704 case 0x2219: return 249;
1705 case 0x00b7: return 250;
1706 case 0x221a: return 251;
1707 case 0x207f: return 252;
1708 case 0x00b2: return 253;
1709 case 0x25a0: return 254;
1710 case 0xfffd: return 254;
1711 case 0x00a0: return 255;
1712
1713 // Approximate mappings for Unicode characters without exact CP437 equivalents
1714
1715 // Rounded/arc box drawing corners
1716 case 0x256d: return 0xda; // ╭ → ┌
1717 case 0x256e: return 0xbf; // ╮ → ┐
1718 case 0x256f: return 0xd9; // ╯ → ┘
1719 case 0x2570: return 0xc0; // ╰ → └
1720
1721 // Diagonal box drawing
1722 case 0x2571: return 0x2f; // ╱ → /
1723 case 0x2572: return 0x5c; // ╲ → \ (backslash)
1724 case 0x2573: return 0x58; // ╳ → X
1725
1726 // Heavy box drawing → single-line equivalents
1727 case 0x2501: return 0xc4; // ━ → ─
1728 case 0x2503: return 0xb3; // ┃ → │
1729 case 0x250f: return 0xda; // ┏ → ┌
1730 case 0x2513: return 0xbf; // ┓ → ┐
1731 case 0x2517: return 0xc0; // ┗ → └
1732 case 0x251b: return 0xd9; // ┛ → ┘
1733 case 0x2523: return 0xc3; // ┣ → ├
1734 case 0x252b: return 0xb4; // ┫ → ┤
1735 case 0x2533: return 0xc2; // ┳ → ┬
1736 case 0x253b: return 0xc1; // ┻ → ┴
1737 case 0x254b: return 0xc5; // ╋ → ┼
1738
1739 // Mixed heavy/light box drawing corners
1740 case 0x250d: return 0xda; // ┍ → ┌
1741 case 0x250e: return 0xda; // ┎ → ┌
1742 case 0x2511: return 0xbf; // ┑ → ┐
1743 case 0x2512: return 0xbf; // ┒ → ┐
1744 case 0x2515: return 0xc0; // ┕ → └
1745 case 0x2516: return 0xc0; // ┖ → └
1746 case 0x2519: return 0xd9; // ┙ → ┘
1747 case 0x251a: return 0xd9; // ┚ → ┘
1748
1749 // Mixed heavy/light box drawing T-pieces
1750 case 0x251d: return 0xc3; // ┝ → ├
1751 case 0x251e: return 0xc3; // ┞ → ├
1752 case 0x251f: return 0xc3; // ┟ → ├
1753 case 0x2520: return 0xc3; // ┠ → ├
1754 case 0x2521: return 0xc3; // ┡ → ├
1755 case 0x2522: return 0xc3; // ┢ → ├
1756 case 0x2525: return 0xb4; // ┥ → ┤
1757 case 0x2526: return 0xb4; // ┦ → ┤
1758 case 0x2527: return 0xb4; // ┧ → ┤
1759 case 0x2528: return 0xb4; // ┨ → ┤
1760 case 0x2529: return 0xb4; // ┩ → ┤
1761 case 0x252a: return 0xb4; // ┪ → ┤
1762 case 0x252d: return 0xc2; // ┭ → ┬
1763 case 0x252e: return 0xc2; // ┮ → ┬
1764 case 0x252f: return 0xc2; // ┯ → ┬
1765 case 0x2530: return 0xc2; // ┰ → ┬
1766 case 0x2531: return 0xc2; // ┱ → ┬
1767 case 0x2532: return 0xc2; // ┲ → ┬
1768 case 0x2535: return 0xc1; // ┵ → ┴
1769 case 0x2536: return 0xc1; // ┶ → ┴
1770 case 0x2537: return 0xc1; // ┷ → ┴
1771 case 0x2538: return 0xc1; // ┸ → ┴
1772 case 0x2539: return 0xc1; // ┹ → ┴
1773 case 0x253a: return 0xc1; // ┺ → ┴
1774
1775 // Mixed heavy/light box drawing crosses
1776 case 0x253d: return 0xc5; // ┽ → ┼
1777 case 0x253e: return 0xc5; // ┾ → ┼
1778 case 0x253f: return 0xc5; // ┿ → ┼
1779 case 0x2540: return 0xc5; // ╀ → ┼
1780 case 0x2541: return 0xc5; // ╁ → ┼
1781 case 0x2542: return 0xc5; // ╂ → ┼
1782 case 0x2543: return 0xc5; // ╃ → ┼
1783 case 0x2544: return 0xc5; // ╄ → ┼
1784 case 0x2545: return 0xc5; // ╅ → ┼
1785 case 0x2546: return 0xc5; // ╆ → ┼
1786 case 0x2547: return 0xc5; // ╇ → ┼
1787 case 0x2548: return 0xc5; // ╈ → ┼
1788 case 0x2549: return 0xc5; // ╉ → ┼
1789 case 0x254a: return 0xc5; // ╊ → ┼
1790
1791 // Dashed/dotted box drawing → solid equivalents
1792 case 0x2504: return 0xc4; // ┄ → ─
1793 case 0x2505: return 0xc4; // ┅ → ─
1794 case 0x2506: return 0xb3; // ┆ → │
1795 case 0x2507: return 0xb3; // ┇ → │
1796 case 0x2508: return 0xc4; // ┈ → ─
1797 case 0x2509: return 0xc4; // ┉ → ─
1798 case 0x250a: return 0xb3; // ┊ → │
1799 case 0x250b: return 0xb3; // ┋ → │
1800
1801 // Box drawing half-lines and fragments
1802 case 0x2574: return 0xc4; // ╴ → ─
1803 case 0x2575: return 0xb3; // ╵ → │
1804 case 0x2576: return 0xc4; // ╶ → ─
1805 case 0x2577: return 0xb3; // ╷ → │
1806 case 0x2578: return 0xc4; // ╸ → ─
1807 case 0x2579: return 0xb3; // ╹ → │
1808 case 0x257a: return 0xc4; // ╺ → ─
1809 case 0x257b: return 0xb3; // ╻ → │
1810 case 0x257c: return 0xc4; // ╼ → ─
1811 case 0x257d: return 0xb3; // ╽ → │
1812 case 0x257e: return 0xc4; // ╾ → ─
1813 case 0x257f: return 0xb3; // ╿ → │
1814
1815 // Triangle variants → filled equivalents
1816 case 0x25b3: return 30; // △ → ▲
1817 case 0x25b5: return 30; // ▵ → ▲
1818 case 0x25b7: return 16; // ▷ → ►
1819 case 0x25b9: return 16; // ▹ → ►
1820 case 0x25bd: return 31; // ▽ → ▼
1821 case 0x25bf: return 31; // ▿ → ▼
1822 case 0x25c1: return 17; // ◁ → ◄
1823 case 0x25c3: return 17; // ◃ → ◄
1824
1825 // Fractional block elements → closest CP437 block
1826 case 0x2581: return 0xdc; // ▁ (lower 1/8) → ▄
1827 case 0x2582: return 0xdc; // ▂ (lower 1/4) → ▄
1828 case 0x2583: return 0xdc; // ▃ (lower 3/8) → ▄
1829 case 0x2585: return 0xdc; // ▅ (lower 5/8) → ▄
1830 case 0x2586: return 0xdb; // ▆ (lower 3/4) → █
1831 case 0x2587: return 0xdb; // ▇ (lower 7/8) → █
1832 case 0x2589: return 0xdb; // ▉ (left 7/8) → █
1833 case 0x258a: return 0xdb; // ▊ (left 3/4) → █
1834 case 0x258b: return 0xdd; // ▋ (left 5/8) → ▌
1835 case 0x258d: return 0xdd; // ▍ (left 3/8) → ▌
1836 case 0x258e: return 0xdd; // ▎ (left 1/4) → ▌
1837 case 0x258f: return 0xdd; // ▏ (left 1/8) → ▌
1838 case 0x2594: return 0xdf; // ▔ (upper 1/8) → ▀
1839 case 0x2595: return 0xde; // ▕ (right 1/8) → ▐
1840
1841 // Quadrant block elements
1842 case 0x2596: return 0xdc; // ▖ → ▄
1843 case 0x2597: return 0xdc; // ▗ → ▄
1844 case 0x2598: return 0xdf; // ▘ → ▀
1845 case 0x2599: return 0xdb; // ▙ → █
1846 case 0x259a: return 0xb1; // ▚ → ▒
1847 case 0x259b: return 0xdb; // ▛ → █
1848 case 0x259c: return 0xdb; // ▜ → █
1849 case 0x259d: return 0xdf; // ▝ → ▀
1850 case 0x259e: return 0xb1; // ▞ → ▒
1851 case 0x259f: return 0xdb; // ▟ → █
1852
1853 // Circles and bullets
1854 case 0x25cf: return 0x07; // ● → •
1855 case 0x25c9: return 0x0a; // ◉ → ◙
1856 case 0x25ef: return 0x09; // ◯ → ○
1857 case 0x25e6: return 0x09; // ◦ → ○
1858 case 0x25aa: return 0xfe; // ▪ → ■
1859 case 0x25fc: return 0xfe; // ◼ → ■
1860
1861 // Typographic punctuation
1862 case 0x2013: return 0x2d; // – (en dash) → -
1863 case 0x2014: return 0x2d; // — (em dash) → -
1864 case 0x2018: return 0x27; // ' (left single quote) → '
1865 case 0x2019: return 0x27; // ' (right single quote) → '
1866 case 0x201c: return 0x22; // " (left double quote) → "
1867 case 0x201d: return 0x22; // " (right double quote) → "
1868 case 0x2026: return 0xfa; // … (ellipsis) → ·
1869 case 0x2212: return 0x2d; // − (minus sign) → -
1870
1871 // Check marks
1872 case 0x2713: return 0xfb; // ✓ → √
1873 case 0x2714: return 0xfb; // ✔ → √
1874
1875 // Double arrows → single arrow equivalents
1876 case 0x21d0: return 27; // ⇐ → ←
1877 case 0x21d1: return 24; // ⇑ → ↑
1878 case 0x21d2: return 26; // ⇒ → →
1879 case 0x21d3: return 25; // ⇓ → ↓
1880 case 0x21d4: return 29; // ⇔ → ↔
1881 case 0x21d5: return 18; // ⇕ → ↕
1882
1883 // Summation sign
1884 case 0x2211: return 0xe4; // ∑ → Σ
1885
1886 // Horizontal line extension
1887 case 0x23af: return 0xc4; // ⎯ → ─
1888
1889 // Media transport symbols
1890 case 0x23f4: return 17; // ⏴ → ◄
1891 case 0x23f5: return 16; // ⏵ → ►
1892 case 0x23f6: return 30; // ⏶ → ▲
1893 case 0x23f7: return 31; // ⏷ → ▼
1894 case 0x23f8: return 0xba; // ⏸ → ║
1895 case 0x23f9: return 0xfe; // ⏹ → ■
1896 case 0x23fa: return 0x07; // ⏺ → •
1897
1898 // Square bracket pieces
1899 case 0x23a1: return 0xda; // ⎡ → ┌
1900 case 0x23a2: return 0xb3; // ⎢ → │
1901 case 0x23a3: return 0xc0; // ⎣ → └
1902 case 0x23a4: return 0xbf; // ⎤ → ┐
1903 case 0x23a5: return 0xb3; // ⎥ → │
1904 case 0x23a6: return 0xd9; // ⎦ → ┘
1905
1906 // Curly bracket pieces
1907 case 0x23a7: return 0xda; // ⎧ → ┌
1908 case 0x23a8: return 0xc3; // ⎨ → ├
1909 case 0x23a9: return 0xc0; // ⎩ → └
1910 case 0x23aa: return 0xb3; // ⎪ → │
1911 case 0x23ab: return 0xbf; // ⎫ → ┐
1912 case 0x23ac: return 0xb4; // ⎬ → ┤
1913 case 0x23ad: return 0xd9; // ⎭ → ┘
1914 case 0x23ae: return 0xb3; // ⎮ → │
1915
1916 // Vertical box lines
1917 case 0x23b8: return 0xb3; // ⎸ → │
1918 case 0x23b9: return 0xb3; // ⎹ → │
1919
1920 // Horizontal scan lines (0x23bd already mapped above)
1921 case 0x23ba: return 0xc4; // ⎺ → ─
1922 case 0x23bb: return 0xc4; // ⎻ → ─
1923 case 0x23bc: return 0xc4; // ⎼ → ─
1924
1925 // Dentistry/angle symbols
1926 case 0x23be: return 0xb3; // ⎾ → │
1927 case 0x23bf: return 0xc0; // ⎿ → └
1928
1929 // Corner brackets
1930 case 0x231c: return 0xda; // ⌜ → ┌
1931 case 0x231d: return 0xbf; // ⌝ → ┐
1932 case 0x231e: return 0xc0; // ⌞ → └
1933 case 0x231f: return 0xd9; // ⌟ → ┘
1934 }
1935
1936 return -1;
1937}
1938
1939static void insert_shift(struct flanterm_context *ctx, size_t count) {
1940 if (ctx->insert_mode && count > 0) {
1941 size_t x, y;
1942 ctx->get_cursor_pos(ctx, &x, &y);
1943 if (count > ctx->cols - x) {
1944 count = ctx->cols - x;
1945 }
1946 for (size_t i = ctx->cols - 1; i >= x + count; i--) {
1947 ctx->move_character(ctx, i, y, i - count, y);
1948 }
1949 }
1950}
1951
1952static void flanterm_putchar(struct flanterm_context *ctx, uint8_t c) {
1953 if (ctx->discard_next || (c == 0x18 || c == 0x1a)) {
1954 ctx->discard_next = false;
1955 ctx->escape = false;
1956 ctx->control_sequence = false;
1957 ctx->unicode_remaining = 0;
1958 ctx->osc = false;
1959 ctx->osc_escape = false;
1960 ctx->g_select = 0;
1961 ctx->last_was_graphic = false;
1962 return;
1963 }
1964
1965 if (ctx->unicode_remaining != 0) {
1966 if ((c & 0xc0) != 0x80) {
1967 ctx->unicode_remaining = 0;
1968 insert_shift(ctx, count: 1);
1969 ctx->raw_putchar(ctx, 0xfe);
1970 goto unicode_error;
1971 }
1972
1973 ctx->unicode_remaining--;
1974 ctx->code_point |= (uint64_t)(c & 0x3f) << (6 * ctx->unicode_remaining);
1975
1976 // Reject overlong encodings and out-of-range codepoints early
1977 // by validating the first continuation byte against the lead byte.
1978 // 3-byte lead E0: first continuation must be >= 0xA0 (code_point >= 0x800)
1979 // 4-byte lead F0: first continuation must be >= 0x90 (code_point >= 0x10000)
1980 // 4-byte lead F4: first continuation must be <= 0x8F (code_point <= 0x10FFFF)
1981 if (ctx->unicode_remaining == 1 && ctx->code_point < 0x800) {
1982 ctx->unicode_remaining = 0;
1983 goto unicode_error;
1984 }
1985 if (ctx->unicode_remaining == 2 && ctx->code_point < 0x10000) {
1986 ctx->unicode_remaining = 0;
1987 goto unicode_error;
1988 }
1989 if (ctx->unicode_remaining == 2 && ctx->code_point > 0x10ffff) {
1990 ctx->unicode_remaining = 0;
1991 goto unicode_error;
1992 }
1993
1994 if (ctx->unicode_remaining != 0) {
1995 return;
1996 }
1997
1998 if (ctx->code_point >= 0xd800 && ctx->code_point <= 0xdfff) {
1999 goto unicode_error;
2000 }
2001
2002 int cc = unicode_to_cp437(code_point: ctx->code_point);
2003
2004 if (cc == -1) {
2005 int replacement_width = mk_wcwidth(ucs: ctx->code_point);
2006 if (replacement_width > 0) {
2007 insert_shift(ctx, count: replacement_width);
2008 ctx->last_printed_char = 0xfe;
2009 ctx->last_was_graphic = true;
2010 ctx->raw_putchar(ctx, 0xfe);
2011 }
2012 for (int i = 1; i < replacement_width; i++) {
2013 ctx->raw_putchar(ctx, ' ');
2014 }
2015 } else {
2016 insert_shift(ctx, count: 1);
2017 ctx->last_printed_char = cc;
2018 ctx->last_was_graphic = true;
2019 ctx->raw_putchar(ctx, cc);
2020 }
2021 return;
2022 }
2023
2024unicode_error:
2025 if (c >= 0xc2 && c <= 0xf4) {
2026 ctx->g_select = 0;
2027 if (c >= 0xc2 && c <= 0xdf) {
2028 ctx->unicode_remaining = 1;
2029 ctx->code_point = (uint64_t)(c & 0x1f) << 6;
2030 } else if (c >= 0xe0 && c <= 0xef) {
2031 ctx->unicode_remaining = 2;
2032 ctx->code_point = (uint64_t)(c & 0x0f) << (6 * 2);
2033 } else if (c >= 0xf0 && c <= 0xf4) {
2034 ctx->unicode_remaining = 3;
2035 ctx->code_point = (uint64_t)(c & 0x07) << (6 * 3);
2036 }
2037 return;
2038 }
2039
2040 if (ctx->escape == true) {
2041 escape_parse(ctx, c);
2042 return;
2043 }
2044
2045 if (ctx->g_select) {
2046 if (c <= 0x1f || c == 0x7f) {
2047 ctx->g_select = 0;
2048 } else {
2049 ctx->g_select--;
2050 switch (c) {
2051 case 'B':
2052 ctx->charsets[ctx->g_select] = CHARSET_DEFAULT; break;
2053 case '0':
2054 ctx->charsets[ctx->g_select] = CHARSET_DEC_SPECIAL; break;
2055 }
2056 ctx->g_select = 0;
2057 return;
2058 }
2059 }
2060
2061 if ((c <= 0x1f && c != 0x1b) || c == 0x7f) {
2062 ctx->last_was_graphic = false;
2063 }
2064
2065 switch (c) {
2066 case 0x00:
2067 case 0x7f:
2068 return;
2069 case 0x1b:
2070 ctx->escape_offset = 0;
2071 ctx->escape = true;
2072 return;
2073 }
2074
2075 if (c < 0x20) {
2076 execute_c0(ctx, c);
2077 return;
2078 }
2079
2080 insert_shift(ctx, count: 1);
2081
2082 // Translate character set
2083 switch (ctx->charsets[ctx->current_charset]) {
2084 case CHARSET_DEFAULT:
2085 break;
2086 case CHARSET_DEC_SPECIAL:
2087 if (dec_special_print(ctx, c)) {
2088 return;
2089 }
2090 break;
2091 }
2092
2093 if (c >= 0x20 && c <= 0x7e) {
2094 ctx->last_printed_char = c;
2095 ctx->last_was_graphic = true;
2096 ctx->raw_putchar(ctx, c);
2097 } else if (c >= 0x80) {
2098 ctx->last_printed_char = 0xfe;
2099 ctx->last_was_graphic = true;
2100 ctx->raw_putchar(ctx, 0xfe);
2101 }
2102}
2103
2104void flanterm_flush(struct flanterm_context *ctx) {
2105 ctx->double_buffer_flush(ctx);
2106}
2107
2108void flanterm_full_refresh(struct flanterm_context *ctx) {
2109 ctx->full_refresh(ctx);
2110}
2111
2112void flanterm_deinit(struct flanterm_context *ctx, void (*_free)(void *, size_t)) {
2113 ctx->deinit(ctx, _free);
2114}
2115
2116void flanterm_get_dimensions(struct flanterm_context *ctx, size_t *cols, size_t *rows) {
2117 *cols = ctx->cols;
2118 *rows = ctx->rows;
2119}
2120
2121void flanterm_set_autoflush(struct flanterm_context *ctx, bool state) {
2122 ctx->autoflush = state;
2123}
2124
2125void flanterm_set_callback(struct flanterm_context *ctx, void (*callback)(struct flanterm_context *, uint64_t, uint64_t, uint64_t, uint64_t)) {
2126 ctx->callback = callback;
2127}
2128
2129void flanterm_get_cursor_pos(struct flanterm_context *ctx, size_t *x, size_t *y) {
2130 ctx->get_cursor_pos(ctx, x, y);
2131}
2132
2133void flanterm_set_cursor_pos(struct flanterm_context *ctx, size_t x, size_t y) {
2134 if (x >= ctx->cols) {
2135 x = ctx->cols - 1;
2136 }
2137
2138 if (y >= ctx->rows) {
2139 y = ctx->rows - 1;
2140 }
2141
2142 ctx->set_cursor_pos(ctx, x, y);
2143}
2144
2145void flanterm_set_text_fg(struct flanterm_context *ctx, size_t colour, bool bright) {
2146 ctx->current_primary = colour;
2147
2148 if (bright) {
2149 if (!ctx->reverse_video) {
2150 ctx->set_text_fg_bright(ctx, colour);
2151 } else {
2152 ctx->set_text_bg_bright(ctx, colour);
2153 }
2154 } else {
2155 if (!ctx->reverse_video) {
2156 ctx->set_text_fg(ctx, colour);
2157 } else {
2158 ctx->set_text_bg(ctx, colour);
2159 }
2160 }
2161}
2162
2163void flanterm_set_text_bg(struct flanterm_context *ctx, size_t colour, bool bright) {
2164 ctx->current_bg = colour;
2165
2166 if (bright) {
2167 if (!ctx->reverse_video) {
2168 ctx->set_text_bg_bright(ctx, colour);
2169 } else {
2170 ctx->set_text_fg_bright(ctx, colour);
2171 }
2172 } else {
2173 if (!ctx->reverse_video) {
2174 ctx->set_text_bg(ctx, colour);
2175 } else {
2176 ctx->set_text_fg(ctx, colour);
2177 }
2178 }
2179}
2180
2181void flanterm_reset_text_fg(struct flanterm_context *ctx) {
2182 ctx->current_primary = (size_t)-1;
2183
2184 if (!ctx->bold) {
2185 if (!ctx->reverse_video) {
2186 ctx->set_text_fg_default(ctx);
2187 } else {
2188 ctx->set_text_bg_default(ctx);
2189 }
2190 } else {
2191 if (!ctx->reverse_video) {
2192 ctx->set_text_fg_default_bright(ctx);
2193 } else {
2194 ctx->set_text_bg_default_bright(ctx);
2195 }
2196 }
2197}
2198
2199void flanterm_reset_text_bg(struct flanterm_context *ctx) {
2200 ctx->current_bg = (size_t)-1;
2201
2202 if (!ctx->bg_bold) {
2203 if (!ctx->reverse_video) {
2204 ctx->set_text_bg_default(ctx);
2205 } else {
2206 ctx->set_text_fg_default(ctx);
2207 }
2208 } else {
2209 if (!ctx->reverse_video) {
2210 ctx->set_text_bg_default_bright(ctx);
2211 } else {
2212 ctx->set_text_fg_default_bright(ctx);
2213 }
2214 }
2215}
2216
2217void flanterm_clear(struct flanterm_context *ctx, bool move) {
2218 ctx->clear(ctx, move);
2219}
2220
2221