flanterm.c at 3f620fb123a1b0e047de9cfe9ecdde225a628836 · pci.express/flanterm.zig

pci.express / flanterm.zig
Fast and reasonably complete (framebuffer) terminal emulator (Zig fork)
flanterm.zig / flanterm.c
at 3f620fb123a1b0e047de9cfe9ecdde225a628836 46 kB view raw
   1/* Copyright (C) 2022-2025 mintsuki and contributors.
   2 *
   3 * Redistribution and use in source and binary forms, with or without
   4 * modification, are permitted provided that the following conditions are met:
   5 *
   6 * 1. Redistributions of source code must retain the above copyright notice,
   7 *    this list of conditions and the following disclaimer.
   8 *
   9 * 2. Redistributions in binary form must reproduce the above copyright notice,
  10 *    this list of conditions and the following disclaimer in the documentation
  11 *    and/or other materials provided with the distribution.
  12 *
  13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  17 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  23 * POSSIBILITY OF SUCH DAMAGE.
  24 */
  25
  26#include <stdint.h>
  27#include <stddef.h>
  28#include <stdbool.h>
  29
  30#define FLANTERM_IN_FLANTERM
  31
  32#include "flanterm.h"
  33
  34// Tries to implement this standard for terminfo
  35// https://man7.org/linux/man-pages/man4/console_codes.4.html
  36
  37static const uint32_t col256[] = {
  38    0x000000, 0x00005f, 0x000087, 0x0000af, 0x0000d7, 0x0000ff, 0x005f00, 0x005f5f,
  39    0x005f87, 0x005faf, 0x005fd7, 0x005fff, 0x008700, 0x00875f, 0x008787, 0x0087af,
  40    0x0087d7, 0x0087ff, 0x00af00, 0x00af5f, 0x00af87, 0x00afaf, 0x00afd7, 0x00afff,
  41    0x00d700, 0x00d75f, 0x00d787, 0x00d7af, 0x00d7d7, 0x00d7ff, 0x00ff00, 0x00ff5f,
  42    0x00ff87, 0x00ffaf, 0x00ffd7, 0x00ffff, 0x5f0000, 0x5f005f, 0x5f0087, 0x5f00af,
  43    0x5f00d7, 0x5f00ff, 0x5f5f00, 0x5f5f5f, 0x5f5f87, 0x5f5faf, 0x5f5fd7, 0x5f5fff,
  44    0x5f8700, 0x5f875f, 0x5f8787, 0x5f87af, 0x5f87d7, 0x5f87ff, 0x5faf00, 0x5faf5f,
  45    0x5faf87, 0x5fafaf, 0x5fafd7, 0x5fafff, 0x5fd700, 0x5fd75f, 0x5fd787, 0x5fd7af,
  46    0x5fd7d7, 0x5fd7ff, 0x5fff00, 0x5fff5f, 0x5fff87, 0x5fffaf, 0x5fffd7, 0x5fffff,
  47    0x870000, 0x87005f, 0x870087, 0x8700af, 0x8700d7, 0x8700ff, 0x875f00, 0x875f5f,
  48    0x875f87, 0x875faf, 0x875fd7, 0x875fff, 0x878700, 0x87875f, 0x878787, 0x8787af,
  49    0x8787d7, 0x8787ff, 0x87af00, 0x87af5f, 0x87af87, 0x87afaf, 0x87afd7, 0x87afff,
  50    0x87d700, 0x87d75f, 0x87d787, 0x87d7af, 0x87d7d7, 0x87d7ff, 0x87ff00, 0x87ff5f,
  51    0x87ff87, 0x87ffaf, 0x87ffd7, 0x87ffff, 0xaf0000, 0xaf005f, 0xaf0087, 0xaf00af,
  52    0xaf00d7, 0xaf00ff, 0xaf5f00, 0xaf5f5f, 0xaf5f87, 0xaf5faf, 0xaf5fd7, 0xaf5fff,
  53    0xaf8700, 0xaf875f, 0xaf8787, 0xaf87af, 0xaf87d7, 0xaf87ff, 0xafaf00, 0xafaf5f,
  54    0xafaf87, 0xafafaf, 0xafafd7, 0xafafff, 0xafd700, 0xafd75f, 0xafd787, 0xafd7af,
  55    0xafd7d7, 0xafd7ff, 0xafff00, 0xafff5f, 0xafff87, 0xafffaf, 0xafffd7, 0xafffff,
  56    0xd70000, 0xd7005f, 0xd70087, 0xd700af, 0xd700d7, 0xd700ff, 0xd75f00, 0xd75f5f,
  57    0xd75f87, 0xd75faf, 0xd75fd7, 0xd75fff, 0xd78700, 0xd7875f, 0xd78787, 0xd787af,
  58    0xd787d7, 0xd787ff, 0xd7af00, 0xd7af5f, 0xd7af87, 0xd7afaf, 0xd7afd7, 0xd7afff,
  59    0xd7d700, 0xd7d75f, 0xd7d787, 0xd7d7af, 0xd7d7d7, 0xd7d7ff, 0xd7ff00, 0xd7ff5f,
  60    0xd7ff87, 0xd7ffaf, 0xd7ffd7, 0xd7ffff, 0xff0000, 0xff005f, 0xff0087, 0xff00af,
  61    0xff00d7, 0xff00ff, 0xff5f00, 0xff5f5f, 0xff5f87, 0xff5faf, 0xff5fd7, 0xff5fff,
  62    0xff8700, 0xff875f, 0xff8787, 0xff87af, 0xff87d7, 0xff87ff, 0xffaf00, 0xffaf5f,
  63    0xffaf87, 0xffafaf, 0xffafd7, 0xffafff, 0xffd700, 0xffd75f, 0xffd787, 0xffd7af,
  64    0xffd7d7, 0xffd7ff, 0xffff00, 0xffff5f, 0xffff87, 0xffffaf, 0xffffd7, 0xffffff,
  65    0x080808, 0x121212, 0x1c1c1c, 0x262626, 0x303030, 0x3a3a3a, 0x444444, 0x4e4e4e,
  66    0x585858, 0x626262, 0x6c6c6c, 0x767676, 0x808080, 0x8a8a8a, 0x949494, 0x9e9e9e,
  67    0xa8a8a8, 0xb2b2b2, 0xbcbcbc, 0xc6c6c6, 0xd0d0d0, 0xdadada, 0xe4e4e4, 0xeeeeee
  68};
  69
  70#define CHARSET_DEFAULT 0
  71#define CHARSET_DEC_SPECIAL 1
  72
  73void flanterm_context_reinit(struct flanterm_context *ctx) {
  74    ctx->tab_size = 8;
  75    ctx->autoflush = true;
  76    ctx->cursor_enabled = true;
  77    ctx->scroll_enabled = true;
  78    ctx->control_sequence = false;
  79    ctx->escape = false;
  80    ctx->osc = false;
  81    ctx->osc_escape = false;
  82    ctx->rrr = false;
  83    ctx->discard_next = false;
  84    ctx->bold = false;
  85    ctx->bg_bold = false;
  86    ctx->reverse_video = false;
  87    ctx->dec_private = false;
  88    ctx->insert_mode = false;
  89    ctx->unicode_remaining = 0;
  90    ctx->g_select = 0;
  91    ctx->charsets[0] = CHARSET_DEFAULT;
  92    ctx->charsets[1] = CHARSET_DEC_SPECIAL;
  93    ctx->current_charset = 0;
  94    ctx->escape_offset = 0;
  95    ctx->esc_values_i = 0;
  96    ctx->saved_cursor_x = 0;
  97    ctx->saved_cursor_y = 0;
  98    ctx->current_primary = (size_t)-1;
  99    ctx->current_bg = (size_t)-1;
 100    ctx->scroll_top_margin = 0;
 101    ctx->scroll_bottom_margin = ctx->rows;
 102    ctx->oob_output = FLANTERM_OOB_OUTPUT_ONLCR;
 103}
 104
 105static void flanterm_putchar(struct flanterm_context *ctx, uint8_t c);
 106
 107void flanterm_write(struct flanterm_context *ctx, const char *buf, size_t count) {
 108    for (size_t i = 0; i < count; i++) {
 109        flanterm_putchar(ctx, buf[i]);
 110    }
 111
 112    if (ctx->autoflush) {
 113        ctx->double_buffer_flush(ctx);
 114    }
 115}
 116
 117static void sgr(struct flanterm_context *ctx) {
 118    size_t i = 0;
 119
 120    if (!ctx->esc_values_i)
 121        goto def;
 122
 123    for (; i < ctx->esc_values_i; i++) {
 124        size_t offset;
 125
 126        if (ctx->esc_values[i] == 0) {
 127def:
 128            if (ctx->reverse_video) {
 129                ctx->reverse_video = false;
 130                ctx->swap_palette(ctx);
 131            }
 132            ctx->bold = false;
 133            ctx->bg_bold = false;
 134            ctx->current_primary = (size_t)-1;
 135            ctx->current_bg = (size_t)-1;
 136            ctx->set_text_bg_default(ctx);
 137            ctx->set_text_fg_default(ctx);
 138            continue;
 139        }
 140
 141        else if (ctx->esc_values[i] == 1) {
 142            ctx->bold = true;
 143            if (ctx->current_primary != (size_t)-1) {
 144                if (!ctx->reverse_video) {
 145                    ctx->set_text_fg_bright(ctx, ctx->current_primary);
 146                } else {
 147                    ctx->set_text_bg_bright(ctx, ctx->current_primary);
 148                }
 149            } else {
 150                if (!ctx->reverse_video) {
 151                    ctx->set_text_fg_default_bright(ctx);
 152                } else {
 153                    ctx->set_text_bg_default_bright(ctx);
 154                }
 155            }
 156            continue;
 157        }
 158
 159        else if (ctx->esc_values[i] == 5) {
 160            ctx->bg_bold = true;
 161            if (ctx->current_bg != (size_t)-1) {
 162                if (!ctx->reverse_video) {
 163                    ctx->set_text_bg_bright(ctx, ctx->current_bg);
 164                } else {
 165                    ctx->set_text_fg_bright(ctx, ctx->current_bg);
 166                }
 167            } else {
 168                if (!ctx->reverse_video) {
 169                    ctx->set_text_bg_default_bright(ctx);
 170                } else {
 171                    ctx->set_text_fg_default_bright(ctx);
 172                }
 173            }
 174            continue;
 175        }
 176
 177        else if (ctx->esc_values[i] == 22) {
 178            ctx->bold = false;
 179            if (ctx->current_primary != (size_t)-1) {
 180                if (!ctx->reverse_video) {
 181                    ctx->set_text_fg(ctx, ctx->current_primary);
 182                } else {
 183                    ctx->set_text_bg(ctx, ctx->current_primary);
 184                }
 185            } else {
 186                if (!ctx->reverse_video) {
 187                    ctx->set_text_fg_default(ctx);
 188                } else {
 189                    ctx->set_text_bg_default(ctx);
 190                }
 191            }
 192            continue;
 193        }
 194
 195        else if (ctx->esc_values[i] == 25) {
 196            ctx->bg_bold = false;
 197            if (ctx->current_bg != (size_t)-1) {
 198                if (!ctx->reverse_video) {
 199                    ctx->set_text_bg(ctx, ctx->current_bg);
 200                } else {
 201                    ctx->set_text_fg(ctx, ctx->current_bg);
 202                }
 203            } else {
 204                if (!ctx->reverse_video) {
 205                    ctx->set_text_bg_default(ctx);
 206                } else {
 207                    ctx->set_text_fg_default(ctx);
 208                }
 209            }
 210            continue;
 211        }
 212
 213        else if (ctx->esc_values[i] >= 30 && ctx->esc_values[i] <= 37) {
 214            offset = 30;
 215            ctx->current_primary = ctx->esc_values[i] - offset;
 216
 217            if (ctx->reverse_video) {
 218                goto set_bg;
 219            }
 220
 221set_fg:
 222            if ((ctx->bold && !ctx->reverse_video)
 223             || (ctx->bg_bold && ctx->reverse_video)) {
 224                ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 225            } else {
 226                ctx->set_text_fg(ctx, ctx->esc_values[i] - offset);
 227            }
 228            continue;
 229        }
 230
 231        else if (ctx->esc_values[i] >= 40 && ctx->esc_values[i] <= 47) {
 232            offset = 40;
 233            ctx->current_bg = ctx->esc_values[i] - offset;
 234
 235            if (ctx->reverse_video) {
 236                goto set_fg;
 237            }
 238
 239set_bg:
 240            if ((ctx->bold && ctx->reverse_video)
 241             || (ctx->bg_bold && !ctx->reverse_video)) {
 242                ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 243            } else {
 244                ctx->set_text_bg(ctx, ctx->esc_values[i] - offset);
 245            }
 246            continue;
 247        }
 248
 249        else if (ctx->esc_values[i] >= 90 && ctx->esc_values[i] <= 97) {
 250            offset = 90;
 251            ctx->current_primary = ctx->esc_values[i] - offset;
 252
 253            if (ctx->reverse_video) {
 254                goto set_bg_bright;
 255            }
 256
 257set_fg_bright:
 258            ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 259            continue;
 260        }
 261
 262        else if (ctx->esc_values[i] >= 100 && ctx->esc_values[i] <= 107) {
 263            offset = 100;
 264            ctx->current_bg = ctx->esc_values[i] - offset;
 265
 266            if (ctx->reverse_video) {
 267                goto set_fg_bright;
 268            }
 269
 270set_bg_bright:
 271            ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 272            continue;
 273        }
 274
 275        else if (ctx->esc_values[i] == 39) {
 276            ctx->current_primary = (size_t)-1;
 277
 278            if (ctx->reverse_video) {
 279                ctx->swap_palette(ctx);
 280            }
 281
 282            if (!ctx->bold) {
 283                ctx->set_text_fg_default(ctx);
 284            } else {
 285                ctx->set_text_fg_default_bright(ctx);
 286            }
 287
 288            if (ctx->reverse_video) {
 289                ctx->swap_palette(ctx);
 290            }
 291
 292            continue;
 293        }
 294
 295        else if (ctx->esc_values[i] == 49) {
 296            ctx->current_bg = (size_t)-1;
 297
 298            if (ctx->reverse_video) {
 299                ctx->swap_palette(ctx);
 300            }
 301
 302            if (!ctx->bg_bold) {
 303                ctx->set_text_bg_default(ctx);
 304            } else {
 305                ctx->set_text_bg_default_bright(ctx);
 306            }
 307
 308            if (ctx->reverse_video) {
 309                ctx->swap_palette(ctx);
 310            }
 311
 312            continue;
 313        }
 314
 315        else if (ctx->esc_values[i] == 7) {
 316            if (!ctx->reverse_video) {
 317                ctx->reverse_video = true;
 318                ctx->swap_palette(ctx);
 319            }
 320            continue;
 321        }
 322
 323        else if (ctx->esc_values[i] == 27) {
 324            if (ctx->reverse_video) {
 325                ctx->reverse_video = false;
 326                ctx->swap_palette(ctx);
 327            }
 328            continue;
 329        }
 330
 331        // 256/RGB
 332        else if (ctx->esc_values[i] == 38 || ctx->esc_values[i] == 48) {
 333            bool fg = ctx->esc_values[i] == 38;
 334
 335            i++;
 336            if (i >= ctx->esc_values_i) {
 337                break;
 338            }
 339
 340            switch (ctx->esc_values[i]) {
 341                case 2: { // RGB
 342                    if (i + 3 >= ctx->esc_values_i) {
 343                        goto out;
 344                    }
 345
 346                    uint32_t rgb_value = 0;
 347
 348                    rgb_value |= ctx->esc_values[i + 1] << 16;
 349                    rgb_value |= ctx->esc_values[i + 2] << 8;
 350                    rgb_value |= ctx->esc_values[i + 3];
 351
 352                    i += 3;
 353
 354                    (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 355
 356                    break;
 357                }
 358                case 5: { // 256 colors
 359                    if (i + 1 >= ctx->esc_values_i) {
 360                        goto out;
 361                    }
 362
 363                    uint32_t col = ctx->esc_values[i + 1];
 364
 365                    i++;
 366
 367                    if (col < 8) {
 368                        (fg ? ctx->set_text_fg : ctx->set_text_bg)(ctx, col);
 369                    } else if (col < 16) {
 370                        (fg ? ctx->set_text_fg_bright : ctx->set_text_bg_bright)(ctx, col - 8);
 371                    } else if (col < 256) {
 372                        uint32_t rgb_value = col256[col - 16];
 373                        (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 374                    }
 375
 376                    break;
 377                }
 378                default: continue;
 379            }
 380        }
 381    }
 382
 383out:;
 384}
 385
 386static void dec_private_parse(struct flanterm_context *ctx, uint8_t c) {
 387    ctx->dec_private = false;
 388
 389    if (ctx->esc_values_i == 0) {
 390        return;
 391    }
 392
 393    bool set;
 394
 395    switch (c) {
 396        case 'h':
 397            set = true; break;
 398        case 'l':
 399            set = false; break;
 400        default:
 401            return;
 402    }
 403
 404    switch (ctx->esc_values[0]) {
 405        case 25: {
 406            if (set) {
 407                ctx->cursor_enabled = true;
 408            } else {
 409                ctx->cursor_enabled = false;
 410            }
 411            return;
 412        }
 413    }
 414
 415    if (ctx->callback != NULL) {
 416        ctx->callback(ctx, FLANTERM_CB_DEC, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 417    }
 418}
 419
 420static void linux_private_parse(struct flanterm_context *ctx) {
 421    if (ctx->esc_values_i == 0) {
 422        return;
 423    }
 424
 425    if (ctx->callback != NULL) {
 426        ctx->callback(ctx, FLANTERM_CB_LINUX, ctx->esc_values_i, (uintptr_t)ctx->esc_values, 0);
 427    }
 428}
 429
 430static void mode_toggle(struct flanterm_context *ctx, uint8_t c) {
 431    if (ctx->esc_values_i == 0) {
 432        return;
 433    }
 434
 435    bool set;
 436
 437    switch (c) {
 438        case 'h':
 439            set = true; break;
 440        case 'l':
 441            set = false; break;
 442        default:
 443            return;
 444    }
 445
 446    switch (ctx->esc_values[0]) {
 447        case 4:
 448            ctx->insert_mode = set; return;
 449    }
 450
 451    if (ctx->callback != NULL) {
 452        ctx->callback(ctx, FLANTERM_CB_MODE, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 453    }
 454}
 455
 456static void osc_parse(struct flanterm_context *ctx, uint8_t c) {
 457    if (ctx->osc_escape && c == '\\') {
 458        goto cleanup;
 459    }
 460
 461    ctx->osc_escape = false;
 462
 463    switch (c) {
 464        case 0x1b:
 465            ctx->osc_escape = true;
 466            return;
 467        case '\a':
 468        default:
 469            break;
 470    }
 471
 472cleanup:
 473    ctx->osc_escape = false;
 474    ctx->osc = false;
 475    ctx->escape = false;
 476}
 477
 478static void control_sequence_parse(struct flanterm_context *ctx, uint8_t c) {
 479    if (ctx->escape_offset == 2) {
 480        switch (c) {
 481            case '[':
 482                ctx->discard_next = true;
 483                goto cleanup;
 484            case '?':
 485                ctx->dec_private = true;
 486                return;
 487        }
 488    }
 489
 490    if (c >= '0' && c <= '9') {
 491        if (ctx->esc_values_i == FLANTERM_MAX_ESC_VALUES) {
 492            return;
 493        }
 494        ctx->rrr = true;
 495        ctx->esc_values[ctx->esc_values_i] *= 10;
 496        ctx->esc_values[ctx->esc_values_i] += c - '0';
 497        return;
 498    }
 499
 500    if (ctx->rrr == true) {
 501        ctx->esc_values_i++;
 502        ctx->rrr = false;
 503        if (c == ';')
 504            return;
 505    } else if (c == ';') {
 506        if (ctx->esc_values_i == FLANTERM_MAX_ESC_VALUES) {
 507            return;
 508        }
 509        ctx->esc_values[ctx->esc_values_i] = 0;
 510        ctx->esc_values_i++;
 511        return;
 512    }
 513
 514    size_t esc_default;
 515    switch (c) {
 516        case 'J': case 'K': case 'q':
 517            esc_default = 0; break;
 518        default:
 519            esc_default = 1; break;
 520    }
 521
 522    for (size_t i = ctx->esc_values_i; i < FLANTERM_MAX_ESC_VALUES; i++) {
 523        ctx->esc_values[i] = esc_default;
 524    }
 525
 526    if (ctx->dec_private == true) {
 527        dec_private_parse(ctx, c);
 528        goto cleanup;
 529    }
 530
 531    bool r = ctx->scroll_enabled;
 532    ctx->scroll_enabled = false;
 533    size_t x, y;
 534    ctx->get_cursor_pos(ctx, &x, &y);
 535
 536    switch (c) {
 537        case 'F':
 538            x = 0;
 539            // FALLTHRU
 540        case 'A': {
 541            if (ctx->esc_values[0] > y)
 542                ctx->esc_values[0] = y;
 543            size_t orig_y = y;
 544            size_t dest_y = y - ctx->esc_values[0];
 545            bool will_be_in_scroll_region = false;
 546            if ((ctx->scroll_top_margin >= dest_y && ctx->scroll_top_margin <= orig_y)
 547             || (ctx->scroll_bottom_margin >= dest_y && ctx->scroll_bottom_margin <= orig_y)) {
 548                will_be_in_scroll_region = true;
 549            }
 550            if (will_be_in_scroll_region && dest_y < ctx->scroll_top_margin) {
 551                dest_y = ctx->scroll_top_margin;
 552            }
 553            ctx->set_cursor_pos(ctx, x, dest_y);
 554            break;
 555        }
 556        case 'E':
 557            x = 0;
 558            // FALLTHRU
 559        case 'e':
 560        case 'B': {
 561            if (y + ctx->esc_values[0] > ctx->rows - 1)
 562                ctx->esc_values[0] = (ctx->rows - 1) - y;
 563            size_t orig_y = y;
 564            size_t dest_y = y + ctx->esc_values[0];
 565            bool will_be_in_scroll_region = false;
 566            if ((ctx->scroll_top_margin >= orig_y && ctx->scroll_top_margin <= dest_y)
 567             || (ctx->scroll_bottom_margin >= orig_y && ctx->scroll_bottom_margin <= dest_y)) {
 568                will_be_in_scroll_region = true;
 569            }
 570            if (will_be_in_scroll_region && dest_y >= ctx->scroll_bottom_margin) {
 571                dest_y = ctx->scroll_bottom_margin - 1;
 572            }
 573            ctx->set_cursor_pos(ctx, x, dest_y);
 574            break;
 575        }
 576        case 'a':
 577        case 'C':
 578            if (x + ctx->esc_values[0] > ctx->cols - 1)
 579                ctx->esc_values[0] = (ctx->cols - 1) - x;
 580            ctx->set_cursor_pos(ctx, x + ctx->esc_values[0], y);
 581            break;
 582        case 'D':
 583            if (ctx->esc_values[0] > x)
 584                ctx->esc_values[0] = x;
 585            ctx->set_cursor_pos(ctx, x - ctx->esc_values[0], y);
 586            break;
 587        case 'c':
 588            if (ctx->callback != NULL) {
 589                ctx->callback(ctx, FLANTERM_CB_PRIVATE_ID, 0, 0, 0);
 590            }
 591            break;
 592        case 'd':
 593            ctx->esc_values[0] -= 1;
 594            if (ctx->esc_values[0] >= ctx->rows)
 595                ctx->esc_values[0] = ctx->rows - 1;
 596            ctx->set_cursor_pos(ctx, x, ctx->esc_values[0]);
 597            break;
 598        case 'G':
 599        case '`':
 600            ctx->esc_values[0] -= 1;
 601            if (ctx->esc_values[0] >= ctx->cols)
 602                ctx->esc_values[0] = ctx->cols - 1;
 603            ctx->set_cursor_pos(ctx, ctx->esc_values[0], y);
 604            break;
 605        case 'H':
 606        case 'f':
 607            if (ctx->esc_values[0] != 0) {
 608                ctx->esc_values[0]--;
 609            }
 610            if (ctx->esc_values[1] != 0) {
 611                ctx->esc_values[1]--;
 612            }
 613            if (ctx->esc_values[1] >= ctx->cols)
 614                ctx->esc_values[1] = ctx->cols - 1;
 615            if (ctx->esc_values[0] >= ctx->rows)
 616                ctx->esc_values[0] = ctx->rows - 1;
 617            ctx->set_cursor_pos(ctx, ctx->esc_values[1], ctx->esc_values[0]);
 618            break;
 619        case 'M': {
 620            size_t count = ctx->esc_values[0] > ctx->rows ? ctx->rows : ctx->esc_values[0];
 621            for (size_t i = 0; i < count; i++) {
 622                ctx->scroll(ctx);
 623            }
 624            break;
 625        }
 626        case 'L': {
 627            size_t old_scroll_top_margin = ctx->scroll_top_margin;
 628            ctx->scroll_top_margin = y;
 629            size_t count = ctx->esc_values[0] > ctx->rows ? ctx->rows : ctx->esc_values[0];
 630            for (size_t i = 0; i < count; i++) {
 631                ctx->revscroll(ctx);
 632            }
 633            ctx->scroll_top_margin = old_scroll_top_margin;
 634            break;
 635        }
 636        case 'n':
 637            switch (ctx->esc_values[0]) {
 638                case 5:
 639                    if (ctx->callback != NULL) {
 640                        ctx->callback(ctx, FLANTERM_CB_STATUS_REPORT, 0, 0, 0);
 641                    }
 642                    break;
 643                case 6:
 644                    if (ctx->callback != NULL) {
 645                        ctx->callback(ctx, FLANTERM_CB_POS_REPORT, x + 1, y + 1, 0);
 646                    }
 647                    break;
 648            }
 649            break;
 650        case 'q':
 651            if (ctx->callback != NULL) {
 652                ctx->callback(ctx, FLANTERM_CB_KBD_LEDS, ctx->esc_values[0], 0, 0);
 653            }
 654            break;
 655        case 'J':
 656            switch (ctx->esc_values[0]) {
 657                case 0: {
 658                    size_t rows_remaining = ctx->rows - (y + 1);
 659                    size_t cols_diff = ctx->cols - (x + 1);
 660                    size_t to_clear = rows_remaining * ctx->cols + cols_diff + 1;
 661                    for (size_t i = 0; i < to_clear; i++) {
 662                        ctx->raw_putchar(ctx, ' ');
 663                    }
 664                    ctx->set_cursor_pos(ctx, x, y);
 665                    break;
 666                }
 667                case 1: {
 668                    ctx->set_cursor_pos(ctx, 0, 0);
 669                    bool b = false;
 670                    for (size_t yc = 0; yc < ctx->rows; yc++) {
 671                        for (size_t xc = 0; xc < ctx->cols; xc++) {
 672                            ctx->raw_putchar(ctx, ' ');
 673                            if (xc == x && yc == y) {
 674                                ctx->set_cursor_pos(ctx, x, y);
 675                                b = true;
 676                                break;
 677                            }
 678                        }
 679                        if (b == true)
 680                            break;
 681                    }
 682                    break;
 683                }
 684                case 2:
 685                case 3:
 686                    ctx->clear(ctx, false);
 687                    break;
 688            }
 689            break;
 690        case '@':
 691            for (size_t i = ctx->cols - 1; ; i--) {
 692                ctx->move_character(ctx, i + ctx->esc_values[0], y, i, y);
 693                ctx->set_cursor_pos(ctx, i, y);
 694                ctx->raw_putchar(ctx, ' ');
 695                if (i == x) {
 696                    break;
 697                }
 698            }
 699            ctx->set_cursor_pos(ctx, x, y);
 700            break;
 701        case 'P':
 702            for (size_t i = x + ctx->esc_values[0]; i < ctx->cols; i++)
 703                ctx->move_character(ctx, i - ctx->esc_values[0], y, i, y);
 704            ctx->set_cursor_pos(ctx, ctx->cols - ctx->esc_values[0], y);
 705            // FALLTHRU
 706        case 'X': {
 707            size_t count = ctx->esc_values[0] > ctx->cols ? ctx->cols : ctx->esc_values[0];
 708            for (size_t i = 0; i < count; i++)
 709                ctx->raw_putchar(ctx, ' ');
 710            ctx->set_cursor_pos(ctx, x, y);
 711            break;
 712        }
 713        case 'm':
 714            sgr(ctx);
 715            break;
 716        case 's':
 717            ctx->get_cursor_pos(ctx, &ctx->saved_cursor_x, &ctx->saved_cursor_y);
 718            break;
 719        case 'u':
 720            ctx->set_cursor_pos(ctx, ctx->saved_cursor_x, ctx->saved_cursor_y);
 721            break;
 722        case 'K':
 723            switch (ctx->esc_values[0]) {
 724                case 0: {
 725                    for (size_t i = x; i < ctx->cols; i++)
 726                        ctx->raw_putchar(ctx, ' ');
 727                    ctx->set_cursor_pos(ctx, x, y);
 728                    break;
 729                }
 730                case 1: {
 731                    ctx->set_cursor_pos(ctx, 0, y);
 732                    for (size_t i = 0; i < x; i++)
 733                        ctx->raw_putchar(ctx, ' ');
 734                    break;
 735                }
 736                case 2: {
 737                    ctx->set_cursor_pos(ctx, 0, y);
 738                    for (size_t i = 0; i < ctx->cols; i++)
 739                        ctx->raw_putchar(ctx, ' ');
 740                    ctx->set_cursor_pos(ctx, x, y);
 741                    break;
 742                }
 743            }
 744            break;
 745        case 'r':
 746            if (ctx->esc_values[0] == 0) {
 747                ctx->esc_values[0] = 1;
 748            }
 749            if (ctx->esc_values[1] == 0) {
 750                ctx->esc_values[1] = 1;
 751            }
 752            ctx->scroll_top_margin = 0;
 753            ctx->scroll_bottom_margin = ctx->rows;
 754            if (ctx->esc_values_i > 0) {
 755                ctx->scroll_top_margin = ctx->esc_values[0] - 1;
 756            }
 757            if (ctx->esc_values_i > 1) {
 758                ctx->scroll_bottom_margin = ctx->esc_values[1];
 759            }
 760            if (ctx->scroll_top_margin >= ctx->rows
 761             || ctx->scroll_bottom_margin > ctx->rows
 762             || ctx->scroll_top_margin >= (ctx->scroll_bottom_margin - 1)) {
 763                ctx->scroll_top_margin = 0;
 764                ctx->scroll_bottom_margin = ctx->rows;
 765            }
 766            ctx->set_cursor_pos(ctx, 0, 0);
 767            break;
 768        case 'l':
 769        case 'h':
 770            mode_toggle(ctx, c);
 771            break;
 772        case ']':
 773            linux_private_parse(ctx);
 774            break;
 775    }
 776
 777    ctx->scroll_enabled = r;
 778
 779cleanup:
 780    ctx->control_sequence = false;
 781    ctx->escape = false;
 782}
 783
 784static void restore_state(struct flanterm_context *ctx) {
 785    ctx->bold = ctx->saved_state_bold;
 786    ctx->bg_bold = ctx->saved_state_bg_bold;
 787    ctx->reverse_video = ctx->saved_state_reverse_video;
 788    ctx->current_charset = ctx->saved_state_current_charset;
 789    ctx->current_primary = ctx->saved_state_current_primary;
 790    ctx->current_bg = ctx->saved_state_current_bg;
 791
 792    ctx->restore_state(ctx);
 793}
 794
 795static void save_state(struct flanterm_context *ctx) {
 796    ctx->save_state(ctx);
 797
 798    ctx->saved_state_bold = ctx->bold;
 799    ctx->saved_state_bg_bold = ctx->bg_bold;
 800    ctx->saved_state_reverse_video = ctx->reverse_video;
 801    ctx->saved_state_current_charset = ctx->current_charset;
 802    ctx->saved_state_current_primary = ctx->current_primary;
 803    ctx->saved_state_current_bg = ctx->current_bg;
 804}
 805
 806static void escape_parse(struct flanterm_context *ctx, uint8_t c) {
 807    ctx->escape_offset++;
 808
 809    if (ctx->osc == true) {
 810        osc_parse(ctx, c);
 811        return;
 812    }
 813
 814    if (ctx->control_sequence == true) {
 815        control_sequence_parse(ctx, c);
 816        return;
 817    }
 818
 819    size_t x, y;
 820    ctx->get_cursor_pos(ctx, &x, &y);
 821
 822    switch (c) {
 823        case ']':
 824            ctx->osc_escape = false;
 825            ctx->osc = true;
 826            return;
 827        case '[':
 828            for (size_t i = 0; i < FLANTERM_MAX_ESC_VALUES; i++)
 829                ctx->esc_values[i] = 0;
 830            ctx->esc_values_i = 0;
 831            ctx->rrr = false;
 832            ctx->control_sequence = true;
 833            return;
 834        case '7':
 835            save_state(ctx);
 836            break;
 837        case '8':
 838            restore_state(ctx);
 839            break;
 840        case 'c':
 841            flanterm_context_reinit(ctx);
 842            ctx->clear(ctx, true);
 843            break;
 844        case 'D':
 845            if (y == ctx->scroll_bottom_margin - 1) {
 846                ctx->scroll(ctx);
 847                ctx->set_cursor_pos(ctx, x, y);
 848            } else {
 849                ctx->set_cursor_pos(ctx, x, y + 1);
 850            }
 851            break;
 852        case 'E':
 853            if (y == ctx->scroll_bottom_margin - 1) {
 854                ctx->scroll(ctx);
 855                ctx->set_cursor_pos(ctx, 0, y);
 856            } else {
 857                ctx->set_cursor_pos(ctx, 0, y + 1);
 858            }
 859            break;
 860        case 'M':
 861            // "Reverse linefeed"
 862            if (y == ctx->scroll_top_margin) {
 863                ctx->revscroll(ctx);
 864                ctx->set_cursor_pos(ctx, 0, y);
 865            } else {
 866                ctx->set_cursor_pos(ctx, 0, y - 1);
 867            }
 868            break;
 869        case 'Z':
 870            if (ctx->callback != NULL) {
 871                ctx->callback(ctx, FLANTERM_CB_PRIVATE_ID, 0, 0, 0);
 872            }
 873            break;
 874        case '(':
 875        case ')':
 876            ctx->g_select = c - '\'';
 877            break;
 878    }
 879
 880    ctx->escape = false;
 881}
 882
 883static bool dec_special_print(struct flanterm_context *ctx, uint8_t c) {
 884#define FLANTERM_DEC_SPCL_PRN(C) ctx->raw_putchar(ctx, (C)); return true;
 885    switch (c) {
 886        case '`': FLANTERM_DEC_SPCL_PRN(0x04)
 887        case '0': FLANTERM_DEC_SPCL_PRN(0xdb)
 888        case '-': FLANTERM_DEC_SPCL_PRN(0x18)
 889        case ',': FLANTERM_DEC_SPCL_PRN(0x1b)
 890        case '.': FLANTERM_DEC_SPCL_PRN(0x19)
 891        case 'a': FLANTERM_DEC_SPCL_PRN(0xb1)
 892        case 'f': FLANTERM_DEC_SPCL_PRN(0xf8)
 893        case 'g': FLANTERM_DEC_SPCL_PRN(0xf1)
 894        case 'h': FLANTERM_DEC_SPCL_PRN(0xb0)
 895        case 'j': FLANTERM_DEC_SPCL_PRN(0xd9)
 896        case 'k': FLANTERM_DEC_SPCL_PRN(0xbf)
 897        case 'l': FLANTERM_DEC_SPCL_PRN(0xda)
 898        case 'm': FLANTERM_DEC_SPCL_PRN(0xc0)
 899        case 'n': FLANTERM_DEC_SPCL_PRN(0xc5)
 900        case 'q': FLANTERM_DEC_SPCL_PRN(0xc4)
 901        case 's': FLANTERM_DEC_SPCL_PRN(0x5f)
 902        case 't': FLANTERM_DEC_SPCL_PRN(0xc3)
 903        case 'u': FLANTERM_DEC_SPCL_PRN(0xb4)
 904        case 'v': FLANTERM_DEC_SPCL_PRN(0xc1)
 905        case 'w': FLANTERM_DEC_SPCL_PRN(0xc2)
 906        case 'x': FLANTERM_DEC_SPCL_PRN(0xb3)
 907        case 'y': FLANTERM_DEC_SPCL_PRN(0xf3)
 908        case 'z': FLANTERM_DEC_SPCL_PRN(0xf2)
 909        case '~': FLANTERM_DEC_SPCL_PRN(0xfa)
 910        case '_': FLANTERM_DEC_SPCL_PRN(0xff)
 911        case '+': FLANTERM_DEC_SPCL_PRN(0x1a)
 912        case '{': FLANTERM_DEC_SPCL_PRN(0xe3)
 913        case '}': FLANTERM_DEC_SPCL_PRN(0x9c)
 914    }
 915#undef FLANTERM_DEC_SPCL_PRN
 916
 917    return false;
 918}
 919
 920// Following wcwidth related code inherited from:
 921// https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
 922
 923struct interval {
 924    uint32_t first;
 925    uint32_t last;
 926};
 927
 928/* auxiliary function for binary search in interval table */
 929static int bisearch(uint32_t ucs, const struct interval *table, int max) {
 930  int min = 0;
 931  int mid;
 932
 933  if (ucs < table[0].first || ucs > table[max].last)
 934    return 0;
 935  while (max >= min) {
 936    mid = (min + max) / 2;
 937    if (ucs > table[mid].last)
 938      min = mid + 1;
 939    else if (ucs < table[mid].first)
 940      max = mid - 1;
 941    else
 942      return 1;
 943  }
 944
 945  return 0;
 946}
 947
 948int mk_wcwidth(uint32_t ucs) {
 949  /* sorted list of non-overlapping intervals of non-spacing characters */
 950  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
 951  static const struct interval combining[] = {
 952    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
 953    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
 954    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
 955    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
 956    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
 957    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
 958    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
 959    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
 960    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
 961    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
 962    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
 963    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
 964    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
 965    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
 966    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
 967    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
 968    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
 969    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
 970    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
 971    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
 972    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
 973    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
 974    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
 975    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
 976    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
 977    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
 978    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
 979    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
 980    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
 981    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
 982    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
 983    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
 984    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
 985    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
 986    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
 987    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
 988    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
 989    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
 990    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
 991    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
 992    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
 993    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
 994    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
 995    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
 996    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
 997    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
 998    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
 999    { 0xE0100, 0xE01EF }
1000  };
1001
1002  /* test for 8-bit control characters */
1003  if (ucs == 0)
1004    return 0;
1005  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
1006    return 1;
1007
1008  /* binary search in table of non-spacing characters */
1009  if (bisearch(ucs, combining,
1010	       sizeof(combining) / sizeof(struct interval) - 1))
1011    return 0;
1012
1013  /* if we arrive here, ucs is not a combining or C0/C1 control character */
1014
1015  return 1 +
1016    (ucs >= 0x1100 &&
1017     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
1018      ucs == 0x2329 || ucs == 0x232a ||
1019      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
1020       ucs != 0x303f) ||                  /* CJK ... Yi */
1021      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
1022      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
1023      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
1024      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
1025      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
1026      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
1027      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
1028      (ucs >= 0x30000 && ucs <= 0x3fffd)));
1029}
1030
1031// End of https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c inherited code
1032
1033static int unicode_to_cp437(uint64_t code_point) {
1034    switch (code_point) {
1035        case 0x263a: return 1;
1036        case 0x263b: return 2;
1037        case 0x2665: return 3;
1038        case 0x2666: return 4;
1039        case 0x2663: return 5;
1040        case 0x2660: return 6;
1041        case 0x2022: return 7;
1042        case 0x25d8: return 8;
1043        case 0x25cb: return 9;
1044        case 0x25d9: return 10;
1045        case 0x2642: return 11;
1046        case 0x2640: return 12;
1047        case 0x266a: return 13;
1048        case 0x266b: return 14;
1049        case 0x263c: return 15;
1050        case 0x25ba: return 16;
1051        case 0x25c4: return 17;
1052        case 0x2195: return 18;
1053        case 0x203c: return 19;
1054        case 0x00b6: return 20;
1055        case 0x00a7: return 21;
1056        case 0x25ac: return 22;
1057        case 0x21a8: return 23;
1058        case 0x2191: return 24;
1059        case 0x2193: return 25;
1060        case 0x2192: return 26;
1061        case 0x2190: return 27;
1062        case 0x221f: return 28;
1063        case 0x2194: return 29;
1064        case 0x25b2: return 30;
1065        case 0x25bc: return 31;
1066
1067        case 0x2302: return 127;
1068        case 0x00c7: return 128;
1069        case 0x00fc: return 129;
1070        case 0x00e9: return 130;
1071        case 0x00e2: return 131;
1072        case 0x00e4: return 132;
1073        case 0x00e0: return 133;
1074        case 0x00e5: return 134;
1075        case 0x00e7: return 135;
1076        case 0x00ea: return 136;
1077        case 0x00eb: return 137;
1078        case 0x00e8: return 138;
1079        case 0x00ef: return 139;
1080        case 0x00ee: return 140;
1081        case 0x00ec: return 141;
1082        case 0x00c4: return 142;
1083        case 0x00c5: return 143;
1084        case 0x00c9: return 144;
1085        case 0x00e6: return 145;
1086        case 0x00c6: return 146;
1087        case 0x00f4: return 147;
1088        case 0x00f6: return 148;
1089        case 0x00f2: return 149;
1090        case 0x00fb: return 150;
1091        case 0x00f9: return 151;
1092        case 0x00ff: return 152;
1093        case 0x00d6: return 153;
1094        case 0x00dc: return 154;
1095        case 0x00a2: return 155;
1096        case 0x00a3: return 156;
1097        case 0x00a5: return 157;
1098        case 0x20a7: return 158;
1099        case 0x0192: return 159;
1100        case 0x00e1: return 160;
1101        case 0x00ed: return 161;
1102        case 0x00f3: return 162;
1103        case 0x00fa: return 163;
1104        case 0x00f1: return 164;
1105        case 0x00d1: return 165;
1106        case 0x00aa: return 166;
1107        case 0x00ba: return 167;
1108        case 0x00bf: return 168;
1109        case 0x2310: return 169;
1110        case 0x00ac: return 170;
1111        case 0x00bd: return 171;
1112        case 0x00bc: return 172;
1113        case 0x00a1: return 173;
1114        case 0x00ab: return 174;
1115        case 0x00bb: return 175;
1116        case 0x2591: return 176;
1117        case 0x2592: return 177;
1118        case 0x2593: return 178;
1119        case 0x2502: return 179;
1120        case 0x2524: return 180;
1121        case 0x2561: return 181;
1122        case 0x2562: return 182;
1123        case 0x2556: return 183;
1124        case 0x2555: return 184;
1125        case 0x2563: return 185;
1126        case 0x2551: return 186;
1127        case 0x2557: return 187;
1128        case 0x255d: return 188;
1129        case 0x255c: return 189;
1130        case 0x255b: return 190;
1131        case 0x2510: return 191;
1132        case 0x2514: return 192;
1133        case 0x2534: return 193;
1134        case 0x252c: return 194;
1135        case 0x251c: return 195;
1136        case 0x2500: return 196;
1137        case 0x253c: return 197;
1138        case 0x255e: return 198;
1139        case 0x255f: return 199;
1140        case 0x255a: return 200;
1141        case 0x2554: return 201;
1142        case 0x2569: return 202;
1143        case 0x2566: return 203;
1144        case 0x2560: return 204;
1145        case 0x2550: return 205;
1146        case 0x256c: return 206;
1147        case 0x2567: return 207;
1148        case 0x2568: return 208;
1149        case 0x2564: return 209;
1150        case 0x2565: return 210;
1151        case 0x2559: return 211;
1152        case 0x2558: return 212;
1153        case 0x2552: return 213;
1154        case 0x2553: return 214;
1155        case 0x256b: return 215;
1156        case 0x256a: return 216;
1157        case 0x2518: return 217;
1158        case 0x250c: return 218;
1159        case 0x2588: return 219;
1160        case 0x2584: return 220;
1161        case 0x258c: return 221;
1162        case 0x2590: return 222;
1163        case 0x2580: return 223;
1164        case 0x03b1: return 224;
1165        case 0x00df: return 225;
1166        case 0x0393: return 226;
1167        case 0x03c0: return 227;
1168        case 0x03a3: return 228;
1169        case 0x03c3: return 229;
1170        case 0x00b5: return 230;
1171        case 0x03c4: return 231;
1172        case 0x03a6: return 232;
1173        case 0x0398: return 233;
1174        case 0x03a9: return 234;
1175        case 0x03b4: return 235;
1176        case 0x221e: return 236;
1177        case 0x03c6: return 237;
1178        case 0x03b5: return 238;
1179        case 0x2229: return 239;
1180        case 0x2261: return 240;
1181        case 0x00b1: return 241;
1182        case 0x2265: return 242;
1183        case 0x2264: return 243;
1184        case 0x2320: return 244;
1185        case 0x2321: return 245;
1186        case 0x00f7: return 246;
1187        case 0x2248: return 247;
1188        case 0x00b0: return 248;
1189        case 0x2219: return 249;
1190        case 0x00b7: return 250;
1191        case 0x221a: return 251;
1192        case 0x207f: return 252;
1193        case 0x00b2: return 253;
1194        case 0x25a0: return 254;
1195    }
1196
1197    return -1;
1198}
1199
1200static void flanterm_putchar(struct flanterm_context *ctx, uint8_t c) {
1201    if (ctx->discard_next || (c == 0x18 || c == 0x1a)) {
1202        ctx->discard_next = false;
1203        ctx->escape = false;
1204        ctx->control_sequence = false;
1205        ctx->unicode_remaining = 0;
1206        ctx->osc = false;
1207        ctx->osc_escape = false;
1208        ctx->g_select = 0;
1209        return;
1210    }
1211
1212    if (ctx->unicode_remaining != 0) {
1213        if ((c & 0xc0) != 0x80) {
1214            ctx->unicode_remaining = 0;
1215            goto unicode_error;
1216        }
1217
1218        ctx->unicode_remaining--;
1219        ctx->code_point |= (uint64_t)(c & 0x3f) << (6 * ctx->unicode_remaining);
1220        if (ctx->unicode_remaining != 0) {
1221            return;
1222        }
1223
1224        int cc = unicode_to_cp437(ctx->code_point);
1225
1226        if (cc == -1) {
1227            size_t replacement_width = (size_t)mk_wcwidth(ctx->code_point);
1228            if (replacement_width > 0) {
1229                ctx->raw_putchar(ctx, 0xfe);
1230            }
1231            for (size_t i = 1; i < replacement_width; i++) {
1232                ctx->raw_putchar(ctx, ' ');
1233            }
1234        } else {
1235            ctx->raw_putchar(ctx, cc);
1236        }
1237        return;
1238    }
1239
1240unicode_error:
1241    if (c >= 0xc0 && c <= 0xf7) {
1242        if (c >= 0xc0 && c <= 0xdf) {
1243            ctx->unicode_remaining = 1;
1244            ctx->code_point = (uint64_t)(c & 0x1f) << 6;
1245        } else if (c >= 0xe0 && c <= 0xef) {
1246            ctx->unicode_remaining = 2;
1247            ctx->code_point = (uint64_t)(c & 0x0f) << (6 * 2);
1248        } else if (c >= 0xf0 && c <= 0xf7) {
1249            ctx->unicode_remaining = 3;
1250            ctx->code_point = (uint64_t)(c & 0x07) << (6 * 3);
1251        }
1252        return;
1253    }
1254
1255    if (ctx->escape == true) {
1256        escape_parse(ctx, c);
1257        return;
1258    }
1259
1260    if (ctx->g_select) {
1261        ctx->g_select--;
1262        switch (c) {
1263            case 'B':
1264                ctx->charsets[ctx->g_select] = CHARSET_DEFAULT; break;
1265            case '0':
1266                ctx->charsets[ctx->g_select] = CHARSET_DEC_SPECIAL; break;
1267        }
1268        ctx->g_select = 0;
1269        return;
1270    }
1271
1272    size_t x, y;
1273    ctx->get_cursor_pos(ctx, &x, &y);
1274
1275    switch (c) {
1276        case 0x00:
1277        case 0x7f:
1278            return;
1279        case 0x1b:
1280            ctx->escape_offset = 0;
1281            ctx->escape = true;
1282            return;
1283        case '\t':
1284            if ((x / ctx->tab_size + 1) >= ctx->cols) {
1285                ctx->set_cursor_pos(ctx, ctx->cols - 1, y);
1286                return;
1287            }
1288            ctx->set_cursor_pos(ctx, (x / ctx->tab_size + 1) * ctx->tab_size, y);
1289            return;
1290        case 0x0b:
1291        case 0x0c:
1292        case '\n':
1293            if (y == ctx->scroll_bottom_margin - 1) {
1294                ctx->scroll(ctx);
1295                ctx->set_cursor_pos(ctx, (ctx->oob_output & FLANTERM_OOB_OUTPUT_ONLCR) ? 0 : x, y);
1296            } else {
1297                ctx->set_cursor_pos(ctx, (ctx->oob_output & FLANTERM_OOB_OUTPUT_ONLCR) ? 0 : x, y + 1);
1298            }
1299            return;
1300        case '\b':
1301            ctx->set_cursor_pos(ctx, x - 1, y);
1302            return;
1303        case '\r':
1304            ctx->set_cursor_pos(ctx, 0, y);
1305            return;
1306        case '\a':
1307            // The bell is handled by the kernel
1308            if (ctx->callback != NULL) {
1309                ctx->callback(ctx, FLANTERM_CB_BELL, 0, 0, 0);
1310            }
1311            return;
1312        case 14:
1313            // Move to G1 set
1314            ctx->current_charset = 1;
1315            return;
1316        case 15:
1317            // Move to G0 set
1318            ctx->current_charset = 0;
1319            return;
1320    }
1321
1322    if (ctx->insert_mode == true) {
1323        for (size_t i = ctx->cols - 1; ; i--) {
1324            ctx->move_character(ctx, i + 1, y, i, y);
1325            if (i == x) {
1326                break;
1327            }
1328        }
1329    }
1330
1331    // Translate character set
1332    switch (ctx->charsets[ctx->current_charset]) {
1333        case CHARSET_DEFAULT:
1334            break;
1335        case CHARSET_DEC_SPECIAL:
1336            if (dec_special_print(ctx, c)) {
1337                return;
1338            }
1339            break;
1340    }
1341
1342    if (c >= 0x20 && c <= 0x7e) {
1343        ctx->raw_putchar(ctx, c);
1344    } else {
1345        ctx->raw_putchar(ctx, 0xfe);
1346    }
1347}
1348
1349void flanterm_full_refresh(struct flanterm_context *ctx) {
1350    ctx->full_refresh(ctx);
1351}
1352
1353void flanterm_deinit(struct flanterm_context *ctx, void (*_free)(void *, size_t)) {
1354    ctx->deinit(ctx, _free);
1355}
1356
1357void flanterm_get_dimensions(struct flanterm_context *ctx, size_t *cols, size_t *rows) {
1358    *cols = ctx->cols;
1359    *rows = ctx->rows;
1360}
1361
1362void flanterm_set_autoflush(struct flanterm_context *ctx, bool state) {
1363    ctx->autoflush = state;
1364}
1365
1366void flanterm_set_callback(struct flanterm_context *ctx, void (*callback)(struct flanterm_context *, uint64_t, uint64_t, uint64_t, uint64_t)) {
1367    ctx->callback = callback;
1368}