term.c at cb74ddd3e7d29c0a5e37370e9f63664c8bc9a3f2 · pci.express/flanterm.zig

pci.express / flanterm.zig
Fast and reasonably complete (framebuffer) terminal emulator (Zig fork)
flanterm.zig / term.c
at cb74ddd3e7d29c0a5e37370e9f63664c8bc9a3f2 43 kB view raw
   1#include <stdint.h>
   2#include <stddef.h>
   3#include <stdbool.h>
   4
   5#include "term.h"
   6
   7static const uint32_t col256[] = {
   8    0x000000, 0x00005f, 0x000087, 0x0000af, 0x0000d7, 0x0000ff, 0x005f00, 0x005f5f,
   9    0x005f87, 0x005faf, 0x005fd7, 0x005fff, 0x008700, 0x00875f, 0x008787, 0x0087af,
  10    0x0087d7, 0x0087ff, 0x00af00, 0x00af5f, 0x00af87, 0x00afaf, 0x00afd7, 0x00afff,
  11    0x00d700, 0x00d75f, 0x00d787, 0x00d7af, 0x00d7d7, 0x00d7ff, 0x00ff00, 0x00ff5f,
  12    0x00ff87, 0x00ffaf, 0x00ffd7, 0x00ffff, 0x5f0000, 0x5f005f, 0x5f0087, 0x5f00af,
  13    0x5f00d7, 0x5f00ff, 0x5f5f00, 0x5f5f5f, 0x5f5f87, 0x5f5faf, 0x5f5fd7, 0x5f5fff,
  14    0x5f8700, 0x5f875f, 0x5f8787, 0x5f87af, 0x5f87d7, 0x5f87ff, 0x5faf00, 0x5faf5f,
  15    0x5faf87, 0x5fafaf, 0x5fafd7, 0x5fafff, 0x5fd700, 0x5fd75f, 0x5fd787, 0x5fd7af,
  16    0x5fd7d7, 0x5fd7ff, 0x5fff00, 0x5fff5f, 0x5fff87, 0x5fffaf, 0x5fffd7, 0x5fffff,
  17    0x870000, 0x87005f, 0x870087, 0x8700af, 0x8700d7, 0x8700ff, 0x875f00, 0x875f5f,
  18    0x875f87, 0x875faf, 0x875fd7, 0x875fff, 0x878700, 0x87875f, 0x878787, 0x8787af,
  19    0x8787d7, 0x8787ff, 0x87af00, 0x87af5f, 0x87af87, 0x87afaf, 0x87afd7, 0x87afff,
  20    0x87d700, 0x87d75f, 0x87d787, 0x87d7af, 0x87d7d7, 0x87d7ff, 0x87ff00, 0x87ff5f,
  21    0x87ff87, 0x87ffaf, 0x87ffd7, 0x87ffff, 0xaf0000, 0xaf005f, 0xaf0087, 0xaf00af,
  22    0xaf00d7, 0xaf00ff, 0xaf5f00, 0xaf5f5f, 0xaf5f87, 0xaf5faf, 0xaf5fd7, 0xaf5fff,
  23    0xaf8700, 0xaf875f, 0xaf8787, 0xaf87af, 0xaf87d7, 0xaf87ff, 0xafaf00, 0xafaf5f,
  24    0xafaf87, 0xafafaf, 0xafafd7, 0xafafff, 0xafd700, 0xafd75f, 0xafd787, 0xafd7af,
  25    0xafd7d7, 0xafd7ff, 0xafff00, 0xafff5f, 0xafff87, 0xafffaf, 0xafffd7, 0xafffff,
  26    0xd70000, 0xd7005f, 0xd70087, 0xd700af, 0xd700d7, 0xd700ff, 0xd75f00, 0xd75f5f,
  27    0xd75f87, 0xd75faf, 0xd75fd7, 0xd75fff, 0xd78700, 0xd7875f, 0xd78787, 0xd787af,
  28    0xd787d7, 0xd787ff, 0xd7af00, 0xd7af5f, 0xd7af87, 0xd7afaf, 0xd7afd7, 0xd7afff,
  29    0xd7d700, 0xd7d75f, 0xd7d787, 0xd7d7af, 0xd7d7d7, 0xd7d7ff, 0xd7ff00, 0xd7ff5f,
  30    0xd7ff87, 0xd7ffaf, 0xd7ffd7, 0xd7ffff, 0xff0000, 0xff005f, 0xff0087, 0xff00af,
  31    0xff00d7, 0xff00ff, 0xff5f00, 0xff5f5f, 0xff5f87, 0xff5faf, 0xff5fd7, 0xff5fff,
  32    0xff8700, 0xff875f, 0xff8787, 0xff87af, 0xff87d7, 0xff87ff, 0xffaf00, 0xffaf5f,
  33    0xffaf87, 0xffafaf, 0xffafd7, 0xffafff, 0xffd700, 0xffd75f, 0xffd787, 0xffd7af,
  34    0xffd7d7, 0xffd7ff, 0xffff00, 0xffff5f, 0xffff87, 0xffffaf, 0xffffd7, 0xffffff,
  35    0x080808, 0x121212, 0x1c1c1c, 0x262626, 0x303030, 0x3a3a3a, 0x444444, 0x4e4e4e,
  36    0x585858, 0x626262, 0x6c6c6c, 0x767676, 0x808080, 0x8a8a8a, 0x949494, 0x9e9e9e,
  37    0xa8a8a8, 0xb2b2b2, 0xbcbcbc, 0xc6c6c6, 0xd0d0d0, 0xdadada, 0xe4e4e4, 0xeeeeee
  38};
  39
  40// Tries to implement this standard for terminfo
  41// https://man7.org/linux/man-pages/man4/console_codes.4.html
  42
  43#define CHARSET_DEFAULT 0
  44#define CHARSET_DEC_SPECIAL 1
  45
  46void term_context_reinit(struct term_context *ctx) {
  47    ctx->tab_size = 8;
  48    ctx->autoflush = true;
  49    ctx->cursor_enabled = true;
  50    ctx->scroll_enabled = true;
  51    ctx->control_sequence = false;
  52    ctx->csi = false;
  53    ctx->escape = false;
  54    ctx->osc = false;
  55    ctx->osc_escape = false;
  56    ctx->rrr = false;
  57    ctx->discard_next = false;
  58    ctx->bold = false;
  59    ctx->bg_bold = false;
  60    ctx->reverse_video = false;
  61    ctx->dec_private = false;
  62    ctx->insert_mode = false;
  63    ctx->unicode_remaining = 0;
  64    ctx->g_select = 0;
  65    ctx->charsets[0] = CHARSET_DEFAULT;
  66    ctx->charsets[1] = CHARSET_DEC_SPECIAL;
  67    ctx->current_charset = 0;
  68    ctx->escape_offset = 0;
  69    ctx->esc_values_i = 0;
  70    ctx->saved_cursor_x = 0;
  71    ctx->saved_cursor_y = 0;
  72    ctx->current_primary = (size_t)-1;
  73    ctx->current_bg = (size_t)-1;
  74    ctx->scroll_top_margin = 0;
  75    ctx->scroll_bottom_margin = ctx->rows;
  76}
  77
  78static void term_putchar(struct term_context *ctx, uint8_t c);
  79
  80void term_write(struct term_context *ctx, const char *buf, size_t count) {
  81    for (size_t i = 0; i < count; i++) {
  82        term_putchar(ctx, buf[i]);
  83    }
  84
  85    if (ctx->autoflush) {
  86        ctx->double_buffer_flush(ctx);
  87    }
  88}
  89
  90static void sgr(struct term_context *ctx) {
  91    size_t i = 0;
  92
  93    if (!ctx->esc_values_i)
  94        goto def;
  95
  96    for (; i < ctx->esc_values_i; i++) {
  97        size_t offset;
  98
  99        if (ctx->esc_values[i] == 0) {
 100def:
 101            if (ctx->reverse_video) {
 102                ctx->reverse_video = false;
 103                ctx->swap_palette(ctx);
 104            }
 105            ctx->bold = false;
 106            ctx->bg_bold = false;
 107            ctx->current_primary = (size_t)-1;
 108            ctx->current_bg = (size_t)-1;
 109            ctx->set_text_bg_default(ctx);
 110            ctx->set_text_fg_default(ctx);
 111            continue;
 112        }
 113
 114        else if (ctx->esc_values[i] == 1) {
 115            ctx->bold = true;
 116            if (ctx->current_primary != (size_t)-1) {
 117                if (!ctx->reverse_video) {
 118                    ctx->set_text_fg_bright(ctx, ctx->current_primary);
 119                } else {
 120                    ctx->set_text_bg_bright(ctx, ctx->current_primary);
 121                }
 122            } else {
 123                if (!ctx->reverse_video) {
 124                    ctx->set_text_fg_default_bright(ctx);
 125                } else {
 126                    ctx->set_text_bg_default_bright(ctx);
 127                }
 128            }
 129            continue;
 130        }
 131
 132        else if (ctx->esc_values[i] == 5) {
 133            ctx->bg_bold = true;
 134            if (ctx->current_bg != (size_t)-1) {
 135                if (!ctx->reverse_video) {
 136                    ctx->set_text_bg_bright(ctx, ctx->current_bg);
 137                } else {
 138                    ctx->set_text_fg_bright(ctx, ctx->current_bg);
 139                }
 140            } else {
 141                if (!ctx->reverse_video) {
 142                    ctx->set_text_bg_default_bright(ctx);
 143                } else {
 144                    ctx->set_text_fg_default_bright(ctx);
 145                }
 146            }
 147            continue;
 148        }
 149
 150        else if (ctx->esc_values[i] == 22) {
 151            ctx->bold = false;
 152            if (ctx->current_primary != (size_t)-1) {
 153                if (!ctx->reverse_video) {
 154                    ctx->set_text_fg(ctx, ctx->current_primary);
 155                } else {
 156                    ctx->set_text_bg(ctx, ctx->current_primary);
 157                }
 158            } else {
 159                if (!ctx->reverse_video) {
 160                    ctx->set_text_fg_default(ctx);
 161                } else {
 162                    ctx->set_text_bg_default(ctx);
 163                }
 164            }
 165            continue;
 166        }
 167
 168        else if (ctx->esc_values[i] == 25) {
 169            ctx->bg_bold = false;
 170            if (ctx->current_bg != (size_t)-1) {
 171                if (!ctx->reverse_video) {
 172                    ctx->set_text_bg(ctx, ctx->current_bg);
 173                } else {
 174                    ctx->set_text_fg(ctx, ctx->current_bg);
 175                }
 176            } else {
 177                if (!ctx->reverse_video) {
 178                    ctx->set_text_bg_default(ctx);
 179                } else {
 180                    ctx->set_text_fg_default(ctx);
 181                }
 182            }
 183            continue;
 184        }
 185
 186        else if (ctx->esc_values[i] >= 30 && ctx->esc_values[i] <= 37) {
 187            offset = 30;
 188            ctx->current_primary = ctx->esc_values[i] - offset;
 189
 190            if (ctx->reverse_video) {
 191                goto set_bg;
 192            }
 193
 194set_fg:
 195            if ((ctx->bold && !ctx->reverse_video)
 196             || (ctx->bg_bold && ctx->reverse_video)) {
 197                ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 198            } else {
 199                ctx->set_text_fg(ctx, ctx->esc_values[i] - offset);
 200            }
 201            continue;
 202        }
 203
 204        else if (ctx->esc_values[i] >= 40 && ctx->esc_values[i] <= 47) {
 205            offset = 40;
 206            ctx->current_bg = ctx->esc_values[i] - offset;
 207
 208            if (ctx->reverse_video) {
 209                goto set_fg;
 210            }
 211
 212set_bg:
 213            if ((ctx->bold && ctx->reverse_video)
 214             || (ctx->bg_bold && !ctx->reverse_video)) {
 215                ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 216            } else {
 217                ctx->set_text_bg(ctx, ctx->esc_values[i] - offset);
 218            }
 219            continue;
 220        }
 221
 222        else if (ctx->esc_values[i] >= 90 && ctx->esc_values[i] <= 97) {
 223            offset = 90;
 224            ctx->current_primary = ctx->esc_values[i] - offset;
 225
 226            if (ctx->reverse_video) {
 227                goto set_bg_bright;
 228            }
 229
 230set_fg_bright:
 231            ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 232            continue;
 233        }
 234
 235        else if (ctx->esc_values[i] >= 100 && ctx->esc_values[i] <= 107) {
 236            offset = 100;
 237            ctx->current_bg = ctx->esc_values[i] - offset;
 238
 239            if (ctx->reverse_video) {
 240                goto set_fg_bright;
 241            }
 242
 243set_bg_bright:
 244            ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 245            continue;
 246        }
 247
 248        else if (ctx->esc_values[i] == 39) {
 249            ctx->current_primary = (size_t)-1;
 250
 251            if (ctx->reverse_video) {
 252                ctx->swap_palette(ctx);
 253            }
 254
 255            if (!ctx->bold) {
 256                ctx->set_text_fg_default(ctx);
 257            } else {
 258                ctx->set_text_fg_default_bright(ctx);
 259            }
 260
 261            if (ctx->reverse_video) {
 262                ctx->swap_palette(ctx);
 263            }
 264
 265            continue;
 266        }
 267
 268        else if (ctx->esc_values[i] == 49) {
 269            ctx->current_bg = (size_t)-1;
 270
 271            if (ctx->reverse_video) {
 272                ctx->swap_palette(ctx);
 273            }
 274
 275            if (!ctx->bg_bold) {
 276                ctx->set_text_bg_default(ctx);
 277            } else {
 278                ctx->set_text_bg_default_bright(ctx);
 279            }
 280
 281            if (ctx->reverse_video) {
 282                ctx->swap_palette(ctx);
 283            }
 284
 285            continue;
 286        }
 287
 288        else if (ctx->esc_values[i] == 7) {
 289            if (!ctx->reverse_video) {
 290                ctx->reverse_video = true;
 291                ctx->swap_palette(ctx);
 292            }
 293            continue;
 294        }
 295
 296        else if (ctx->esc_values[i] == 27) {
 297            if (ctx->reverse_video) {
 298                ctx->reverse_video = false;
 299                ctx->swap_palette(ctx);
 300            }
 301            continue;
 302        }
 303
 304        // 256/RGB
 305        else if (ctx->esc_values[i] == 38 || ctx->esc_values[i] == 48) {
 306            bool fg = ctx->esc_values[i] == 38;
 307
 308            i++;
 309            if (i >= ctx->esc_values_i) {
 310                break;
 311            }
 312
 313            switch (ctx->esc_values[i]) {
 314                case 2: { // RGB
 315                    if (i + 3 >= ctx->esc_values_i) {
 316                        goto out;
 317                    }
 318
 319                    uint32_t rgb_value = 0;
 320
 321                    rgb_value |= ctx->esc_values[i + 1] << 16;
 322                    rgb_value |= ctx->esc_values[i + 2] << 8;
 323                    rgb_value |= ctx->esc_values[i + 3];
 324
 325                    i += 3;
 326
 327                    (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 328
 329                    break;
 330                }
 331                case 5: { // 256 colors
 332                    if (i + 1 >= ctx->esc_values_i) {
 333                        goto out;
 334                    }
 335
 336                    uint32_t col = ctx->esc_values[i + 1];
 337
 338                    i++;
 339
 340                    if (col < 8) {
 341                        (fg ? ctx->set_text_fg : ctx->set_text_bg)(ctx, col);
 342                    } else if (col < 16) {
 343                        (fg ? ctx->set_text_fg_bright : ctx->set_text_bg_bright)(ctx, col - 8);
 344                    } else {
 345                        uint32_t rgb_value = col256[col - 16];
 346                        (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 347                    }
 348
 349                    break;
 350                }
 351                default: continue;
 352            }
 353        }
 354    }
 355
 356out:;
 357}
 358
 359static void dec_private_parse(struct term_context *ctx, uint8_t c) {
 360    ctx->dec_private = false;
 361
 362    if (ctx->esc_values_i == 0) {
 363        return;
 364    }
 365
 366    bool set;
 367
 368    switch (c) {
 369        case 'h':
 370            set = true; break;
 371        case 'l':
 372            set = false; break;
 373        default:
 374            return;
 375    }
 376
 377    switch (ctx->esc_values[0]) {
 378        case 25: {
 379            if (set) {
 380                ctx->cursor_enabled = true;
 381            } else {
 382                ctx->cursor_enabled = false;
 383            }
 384            return;
 385        }
 386    }
 387
 388    if (ctx->callback != NULL) {
 389        ctx->callback(ctx, TERM_CB_DEC, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 390    }
 391}
 392
 393static void linux_private_parse(struct term_context *ctx) {
 394    if (ctx->esc_values_i == 0) {
 395        return;
 396    }
 397
 398    if (ctx->callback != NULL) {
 399        ctx->callback(ctx, TERM_CB_LINUX, ctx->esc_values_i, (uintptr_t)ctx->esc_values, 0);
 400    }
 401}
 402
 403static void mode_toggle(struct term_context *ctx, uint8_t c) {
 404    if (ctx->esc_values_i == 0) {
 405        return;
 406    }
 407
 408    bool set;
 409
 410    switch (c) {
 411        case 'h':
 412            set = true; break;
 413        case 'l':
 414            set = false; break;
 415        default:
 416            return;
 417    }
 418
 419    switch (ctx->esc_values[0]) {
 420        case 4:
 421            ctx->insert_mode = set; return;
 422    }
 423
 424    if (ctx->callback != NULL) {
 425        ctx->callback(ctx, TERM_CB_MODE, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 426    }
 427}
 428
 429static void osc_parse(struct term_context *ctx, uint8_t c) {
 430    if (ctx->osc_escape && c == '\\') {
 431        goto cleanup;
 432    }
 433
 434    ctx->osc_escape = false;
 435
 436    switch (c) {
 437        case 0x1b:
 438            ctx->osc_escape = true;
 439            break;
 440        case '\a':
 441            goto cleanup;
 442    }
 443
 444    return;
 445
 446cleanup:
 447    ctx->osc_escape = false;
 448    ctx->osc = false;
 449    ctx->escape = false;
 450}
 451
 452static void control_sequence_parse(struct term_context *ctx, uint8_t c) {
 453    if (ctx->escape_offset == 2) {
 454        switch (c) {
 455            case '[':
 456                ctx->discard_next = true;
 457                goto cleanup;
 458            case '?':
 459                ctx->dec_private = true;
 460                return;
 461        }
 462    }
 463
 464    if (c >= '0' && c <= '9') {
 465        if (ctx->esc_values_i == TERM_MAX_ESC_VALUES) {
 466            return;
 467        }
 468        ctx->rrr = true;
 469        ctx->esc_values[ctx->esc_values_i] *= 10;
 470        ctx->esc_values[ctx->esc_values_i] += c - '0';
 471        return;
 472    }
 473
 474    if (ctx->rrr == true) {
 475        ctx->esc_values_i++;
 476        ctx->rrr = false;
 477        if (c == ';')
 478            return;
 479    } else if (c == ';') {
 480        if (ctx->esc_values_i == TERM_MAX_ESC_VALUES) {
 481            return;
 482        }
 483        ctx->esc_values[ctx->esc_values_i] = 0;
 484        ctx->esc_values_i++;
 485        return;
 486    }
 487
 488    size_t esc_default;
 489    switch (c) {
 490        case 'J': case 'K': case 'q':
 491            esc_default = 0; break;
 492        default:
 493            esc_default = 1; break;
 494    }
 495
 496    for (size_t i = ctx->esc_values_i; i < TERM_MAX_ESC_VALUES; i++) {
 497        ctx->esc_values[i] = esc_default;
 498    }
 499
 500    if (ctx->dec_private == true) {
 501        dec_private_parse(ctx, c);
 502        goto cleanup;
 503    }
 504
 505    bool r = ctx->scroll_enabled;
 506    ctx->scroll_enabled = false;
 507    size_t x, y;
 508    ctx->get_cursor_pos(ctx, &x, &y);
 509
 510    switch (c) {
 511        case 'F':
 512            x = 0;
 513            // FALLTHRU
 514        case 'A': {
 515            if (ctx->esc_values[0] > y)
 516                ctx->esc_values[0] = y;
 517            size_t orig_y = y;
 518            size_t dest_y = y - ctx->esc_values[0];
 519            bool will_be_in_scroll_region = false;
 520            if ((ctx->scroll_top_margin >= dest_y && ctx->scroll_top_margin <= orig_y)
 521             || (ctx->scroll_bottom_margin >= dest_y && ctx->scroll_bottom_margin <= orig_y)) {
 522                will_be_in_scroll_region = true;
 523            }
 524            if (will_be_in_scroll_region && dest_y < ctx->scroll_top_margin) {
 525                dest_y = ctx->scroll_top_margin;
 526            }
 527            ctx->set_cursor_pos(ctx, x, dest_y);
 528            break;
 529        }
 530        case 'E':
 531            x = 0;
 532            // FALLTHRU
 533        case 'e':
 534        case 'B': {
 535            if (y + ctx->esc_values[0] > ctx->rows - 1)
 536                ctx->esc_values[0] = (ctx->rows - 1) - y;
 537            size_t orig_y = y;
 538            size_t dest_y = y + ctx->esc_values[0];
 539            bool will_be_in_scroll_region = false;
 540            if ((ctx->scroll_top_margin >= orig_y && ctx->scroll_top_margin <= dest_y)
 541             || (ctx->scroll_bottom_margin >= orig_y && ctx->scroll_bottom_margin <= dest_y)) {
 542                will_be_in_scroll_region = true;
 543            }
 544            if (will_be_in_scroll_region && dest_y >= ctx->scroll_bottom_margin) {
 545                dest_y = ctx->scroll_bottom_margin - 1;
 546            }
 547            ctx->set_cursor_pos(ctx, x, dest_y);
 548            break;
 549        }
 550        case 'a':
 551        case 'C':
 552            if (x + ctx->esc_values[0] > ctx->cols - 1)
 553                ctx->esc_values[0] = (ctx->cols - 1) - x;
 554            ctx->set_cursor_pos(ctx, x + ctx->esc_values[0], y);
 555            break;
 556        case 'D':
 557            if (ctx->esc_values[0] > x)
 558                ctx->esc_values[0] = x;
 559            ctx->set_cursor_pos(ctx, x - ctx->esc_values[0], y);
 560            break;
 561        case 'c':
 562            if (ctx->callback != NULL) {
 563                ctx->callback(ctx, TERM_CB_PRIVATE_ID, 0, 0, 0);
 564            }
 565            break;
 566        case 'd':
 567            ctx->esc_values[0] -= 1;
 568            if (ctx->esc_values[0] >= ctx->rows)
 569                ctx->esc_values[0] = ctx->rows - 1;
 570            ctx->set_cursor_pos(ctx, x, ctx->esc_values[0]);
 571            break;
 572        case 'G':
 573        case '`':
 574            ctx->esc_values[0] -= 1;
 575            if (ctx->esc_values[0] >= ctx->cols)
 576                ctx->esc_values[0] = ctx->cols - 1;
 577            ctx->set_cursor_pos(ctx, ctx->esc_values[0], y);
 578            break;
 579        case 'H':
 580        case 'f':
 581            if (ctx->esc_values[0] != 0) {
 582                ctx->esc_values[0]--;
 583            }
 584            if (ctx->esc_values[1] != 0) {
 585                ctx->esc_values[1]--;
 586            }
 587            if (ctx->esc_values[1] >= ctx->cols)
 588                ctx->esc_values[1] = ctx->cols - 1;
 589            if (ctx->esc_values[0] >= ctx->rows)
 590                ctx->esc_values[0] = ctx->rows - 1;
 591            ctx->set_cursor_pos(ctx, ctx->esc_values[1], ctx->esc_values[0]);
 592            break;
 593        case 'M':
 594            for (size_t i = 0; i < ctx->esc_values[0]; i++) {
 595                ctx->scroll(ctx);
 596            }
 597            break;
 598        case 'L': {
 599            size_t old_scroll_top_margin = ctx->scroll_top_margin;
 600            ctx->scroll_top_margin = y;
 601            for (size_t i = 0; i < ctx->esc_values[0]; i++) {
 602                ctx->revscroll(ctx);
 603            }
 604            ctx->scroll_top_margin = old_scroll_top_margin;
 605            break;
 606        }
 607        case 'n':
 608            switch (ctx->esc_values[0]) {
 609                case 5:
 610                    if (ctx->callback != NULL) {
 611                        ctx->callback(ctx, TERM_CB_STATUS_REPORT, 0, 0, 0);
 612                    }
 613                    break;
 614                case 6:
 615                    if (ctx->callback != NULL) {
 616                        ctx->callback(ctx, TERM_CB_POS_REPORT, x + 1, y + 1, 0);
 617                    }
 618                    break;
 619            }
 620            break;
 621        case 'q':
 622            if (ctx->callback != NULL) {
 623                ctx->callback(ctx, TERM_CB_KBD_LEDS, ctx->esc_values[0], 0, 0);
 624            }
 625            break;
 626        case 'J':
 627            switch (ctx->esc_values[0]) {
 628                case 0: {
 629                    size_t rows_remaining = ctx->rows - (y + 1);
 630                    size_t cols_diff = ctx->cols - (x + 1);
 631                    size_t to_clear = rows_remaining * ctx->cols + cols_diff + 1;
 632                    for (size_t i = 0; i < to_clear; i++) {
 633                        ctx->raw_putchar(ctx, ' ');
 634                    }
 635                    ctx->set_cursor_pos(ctx, x, y);
 636                    break;
 637                }
 638                case 1: {
 639                    ctx->set_cursor_pos(ctx, 0, 0);
 640                    bool b = false;
 641                    for (size_t yc = 0; yc < ctx->rows; yc++) {
 642                        for (size_t xc = 0; xc < ctx->cols; xc++) {
 643                            ctx->raw_putchar(ctx, ' ');
 644                            if (xc == x && yc == y) {
 645                                ctx->set_cursor_pos(ctx, x, y);
 646                                b = true;
 647                                break;
 648                            }
 649                        }
 650                        if (b == true)
 651                            break;
 652                    }
 653                    break;
 654                }
 655                case 2:
 656                case 3:
 657                    ctx->clear(ctx, false);
 658                    break;
 659            }
 660            break;
 661        case '@':
 662            for (size_t i = ctx->cols - 1; ; i--) {
 663                ctx->move_character(ctx, i + ctx->esc_values[0], y, i, y);
 664                ctx->set_cursor_pos(ctx, i, y);
 665                ctx->raw_putchar(ctx, ' ');
 666                if (i == x) {
 667                    break;
 668                }
 669            }
 670            ctx->set_cursor_pos(ctx, x, y);
 671            break;
 672        case 'P':
 673            for (size_t i = x + ctx->esc_values[0]; i < ctx->cols; i++)
 674                ctx->move_character(ctx, i - ctx->esc_values[0], y, i, y);
 675            ctx->set_cursor_pos(ctx, ctx->cols - ctx->esc_values[0], y);
 676            // FALLTHRU
 677        case 'X':
 678            for (size_t i = 0; i < ctx->esc_values[0]; i++)
 679                ctx->raw_putchar(ctx, ' ');
 680            ctx->set_cursor_pos(ctx, x, y);
 681            break;
 682        case 'm':
 683            sgr(ctx);
 684            break;
 685        case 's':
 686            ctx->get_cursor_pos(ctx, &ctx->saved_cursor_x, &ctx->saved_cursor_y);
 687            break;
 688        case 'u':
 689            ctx->set_cursor_pos(ctx, ctx->saved_cursor_x, ctx->saved_cursor_y);
 690            break;
 691        case 'K':
 692            switch (ctx->esc_values[0]) {
 693                case 0: {
 694                    for (size_t i = x; i < ctx->cols; i++)
 695                        ctx->raw_putchar(ctx, ' ');
 696                    ctx->set_cursor_pos(ctx, x, y);
 697                    break;
 698                }
 699                case 1: {
 700                    ctx->set_cursor_pos(ctx, 0, y);
 701                    for (size_t i = 0; i < x; i++)
 702                        ctx->raw_putchar(ctx, ' ');
 703                    break;
 704                }
 705                case 2: {
 706                    ctx->set_cursor_pos(ctx, 0, y);
 707                    for (size_t i = 0; i < ctx->cols; i++)
 708                        ctx->raw_putchar(ctx, ' ');
 709                    ctx->set_cursor_pos(ctx, x, y);
 710                    break;
 711                }
 712            }
 713            break;
 714        case 'r':
 715            if (ctx->esc_values[0] == 0) {
 716                ctx->esc_values[0] = 1;
 717            }
 718            if (ctx->esc_values[1] == 0) {
 719                ctx->esc_values[1] = 1;
 720            }
 721            ctx->scroll_top_margin = 0;
 722            ctx->scroll_bottom_margin = ctx->rows;
 723            if (ctx->esc_values_i > 0) {
 724                ctx->scroll_top_margin = ctx->esc_values[0] - 1;
 725            }
 726            if (ctx->esc_values_i > 1) {
 727                ctx->scroll_bottom_margin = ctx->esc_values[1];
 728            }
 729            if (ctx->scroll_top_margin >= ctx->rows
 730             || ctx->scroll_bottom_margin > ctx->rows
 731             || ctx->scroll_top_margin >= (ctx->scroll_bottom_margin - 1)) {
 732                ctx->scroll_top_margin = 0;
 733                ctx->scroll_bottom_margin = ctx->rows;
 734            }
 735            ctx->set_cursor_pos(ctx, 0, 0);
 736            break;
 737        case 'l':
 738        case 'h':
 739            mode_toggle(ctx, c);
 740            break;
 741        case ']':
 742            linux_private_parse(ctx);
 743            break;
 744    }
 745
 746    ctx->scroll_enabled = r;
 747
 748cleanup:
 749    ctx->control_sequence = false;
 750    ctx->escape = false;
 751}
 752
 753static void restore_state(struct term_context *ctx) {
 754    ctx->bold = ctx->saved_state_bold;
 755    ctx->bg_bold = ctx->saved_state_bg_bold;
 756    ctx->reverse_video = ctx->saved_state_reverse_video;
 757    ctx->current_charset = ctx->saved_state_current_charset;
 758    ctx->current_primary = ctx->saved_state_current_primary;
 759    ctx->current_bg = ctx->saved_state_current_bg;
 760
 761    ctx->restore_state(ctx);
 762}
 763
 764static void save_state(struct term_context *ctx) {
 765    ctx->save_state(ctx);
 766
 767    ctx->saved_state_bold = ctx->bold;
 768    ctx->saved_state_bg_bold = ctx->bg_bold;
 769    ctx->saved_state_reverse_video = ctx->reverse_video;
 770    ctx->saved_state_current_charset = ctx->current_charset;
 771    ctx->saved_state_current_primary = ctx->current_primary;
 772    ctx->saved_state_current_bg = ctx->current_bg;
 773}
 774
 775static void escape_parse(struct term_context *ctx, uint8_t c) {
 776    ctx->escape_offset++;
 777
 778    if (ctx->osc == true) {
 779        osc_parse(ctx, c);
 780        return;
 781    }
 782
 783    if (ctx->control_sequence == true) {
 784        control_sequence_parse(ctx, c);
 785        return;
 786    }
 787
 788    if (ctx->csi == true) {
 789        ctx->csi = false;
 790        goto is_csi;
 791    }
 792
 793    size_t x, y;
 794    ctx->get_cursor_pos(ctx, &x, &y);
 795
 796    switch (c) {
 797        case ']':
 798            ctx->osc_escape = false;
 799            ctx->osc = true;
 800            return;
 801        case '[':
 802is_csi:
 803            for (size_t i = 0; i < TERM_MAX_ESC_VALUES; i++)
 804                ctx->esc_values[i] = 0;
 805            ctx->esc_values_i = 0;
 806            ctx->rrr = false;
 807            ctx->control_sequence = true;
 808            return;
 809        case '7':
 810            save_state(ctx);
 811            break;
 812        case '8':
 813            restore_state(ctx);
 814            break;
 815        case 'c':
 816            term_context_reinit(ctx);
 817            ctx->clear(ctx, true);
 818            break;
 819        case 'D':
 820            if (y == ctx->scroll_bottom_margin - 1) {
 821                ctx->scroll(ctx);
 822                ctx->set_cursor_pos(ctx, x, y);
 823            } else {
 824                ctx->set_cursor_pos(ctx, x, y + 1);
 825            }
 826            break;
 827        case 'E':
 828            if (y == ctx->scroll_bottom_margin - 1) {
 829                ctx->scroll(ctx);
 830                ctx->set_cursor_pos(ctx, 0, y);
 831            } else {
 832                ctx->set_cursor_pos(ctx, 0, y + 1);
 833            }
 834            break;
 835        case 'M':
 836            // "Reverse linefeed"
 837            if (y == ctx->scroll_top_margin) {
 838                ctx->revscroll(ctx);
 839                ctx->set_cursor_pos(ctx, 0, y);
 840            } else {
 841                ctx->set_cursor_pos(ctx, 0, y - 1);
 842            }
 843            break;
 844        case 'Z':
 845            if (ctx->callback != NULL) {
 846                ctx->callback(ctx, TERM_CB_PRIVATE_ID, 0, 0, 0);
 847            }
 848            break;
 849        case '(':
 850        case ')':
 851            ctx->g_select = c - '\'';
 852            break;
 853        case 0x1b:
 854            if (ctx->in_bootloader == true) {
 855                ctx->raw_putchar(ctx, c);
 856            }
 857            break;
 858    }
 859
 860    ctx->escape = false;
 861}
 862
 863static uint8_t dec_special_to_cp437(uint8_t c) {
 864    switch (c) {
 865        case '`': return 0x04;
 866        case '0': return 0xdb;
 867        case '-': return 0x18;
 868        case ',': return 0x1b;
 869        case '.': return 0x19;
 870        case 'a': return 0xb1;
 871        case 'f': return 0xf8;
 872        case 'g': return 0xf1;
 873        case 'h': return 0xb0;
 874        case 'j': return 0xd9;
 875        case 'k': return 0xbf;
 876        case 'l': return 0xda;
 877        case 'm': return 0xc0;
 878        case 'n': return 0xc5;
 879        case 'q': return 0xc4;
 880        case 's': return 0x5f;
 881        case 't': return 0xc3;
 882        case 'u': return 0xb4;
 883        case 'v': return 0xc1;
 884        case 'w': return 0xc2;
 885        case 'x': return 0xb3;
 886        case 'y': return 0xf3;
 887        case 'z': return 0xf2;
 888        case '~': return 0xfa;
 889        case '_': return 0xff;
 890        case '+': return 0x1a;
 891        case '{': return 0xe3;
 892        case '}': return 0x9c;
 893    }
 894
 895    return c;
 896}
 897
 898// Following wcwidth related code inherited from:
 899// https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
 900
 901struct interval {
 902  wchar_t first;
 903  wchar_t last;
 904};
 905
 906/* auxiliary function for binary search in interval table */
 907static int bisearch(wchar_t ucs, const struct interval *table, int max) {
 908  int min = 0;
 909  int mid;
 910
 911  if (ucs < table[0].first || ucs > table[max].last)
 912    return 0;
 913  while (max >= min) {
 914    mid = (min + max) / 2;
 915    if (ucs > table[mid].last)
 916      min = mid + 1;
 917    else if (ucs < table[mid].first)
 918      max = mid - 1;
 919    else
 920      return 1;
 921  }
 922
 923  return 0;
 924}
 925
 926int mk_wcwidth(wchar_t ucs) {
 927  /* sorted list of non-overlapping intervals of non-spacing characters */
 928  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
 929  static const struct interval combining[] = {
 930    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
 931    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
 932    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
 933    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
 934    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
 935    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
 936    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
 937    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
 938    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
 939    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
 940    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
 941    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
 942    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
 943    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
 944    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
 945    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
 946    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
 947    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
 948    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
 949    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
 950    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
 951    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
 952    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
 953    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
 954    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
 955    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
 956    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
 957    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
 958    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
 959    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
 960    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
 961    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
 962    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
 963    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
 964    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
 965    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
 966    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
 967    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
 968    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
 969    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
 970    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
 971    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
 972    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
 973    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
 974    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
 975    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
 976    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
 977    { 0xE0100, 0xE01EF }
 978  };
 979
 980  /* test for 8-bit control characters */
 981  if (ucs == 0)
 982    return 0;
 983  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
 984    return 1;
 985
 986  /* binary search in table of non-spacing characters */
 987  if (bisearch(ucs, combining,
 988	       sizeof(combining) / sizeof(struct interval) - 1))
 989    return 0;
 990
 991  /* if we arrive here, ucs is not a combining or C0/C1 control character */
 992
 993  return 1 +
 994    (ucs >= 0x1100 &&
 995     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
 996      ucs == 0x2329 || ucs == 0x232a ||
 997      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
 998       ucs != 0x303f) ||                  /* CJK ... Yi */
 999      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
1000      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
1001      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
1002      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
1003      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
1004      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
1005      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
1006      (ucs >= 0x30000 && ucs <= 0x3fffd)));
1007}
1008
1009// End of https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c inherited code
1010
1011static int unicode_to_cp437(uint64_t code_point) {
1012    switch (code_point) {
1013        case 0x263a: return 1;
1014        case 0x263b: return 2;
1015        case 0x2665: return 3;
1016        case 0x2666: return 4;
1017        case 0x2663: return 5;
1018        case 0x2660: return 6;
1019        case 0x2022: return 7;
1020        case 0x25d8: return 8;
1021        case 0x25cb: return 9;
1022        case 0x25d9: return 10;
1023        case 0x2642: return 11;
1024        case 0x2640: return 12;
1025        case 0x266a: return 13;
1026        case 0x266b: return 14;
1027        case 0x263c: return 15;
1028        case 0x25ba: return 16;
1029        case 0x25c4: return 17;
1030        case 0x2195: return 18;
1031        case 0x203c: return 19;
1032        case 0x00b6: return 20;
1033        case 0x00a7: return 21;
1034        case 0x25ac: return 22;
1035        case 0x21a8: return 23;
1036        case 0x2191: return 24;
1037        case 0x2193: return 25;
1038        case 0x2192: return 26;
1039        case 0x2190: return 27;
1040        case 0x221f: return 28;
1041        case 0x2194: return 29;
1042        case 0x25b2: return 30;
1043        case 0x25bc: return 31;
1044
1045        case 0x2302: return 127;
1046        case 0x00c7: return 128;
1047        case 0x00fc: return 129;
1048        case 0x00e9: return 130;
1049        case 0x00e2: return 131;
1050        case 0x00e4: return 132;
1051        case 0x00e0: return 133;
1052        case 0x00e5: return 134;
1053        case 0x00e7: return 135;
1054        case 0x00ea: return 136;
1055        case 0x00eb: return 137;
1056        case 0x00e8: return 138;
1057        case 0x00ef: return 139;
1058        case 0x00ee: return 140;
1059        case 0x00ec: return 141;
1060        case 0x00c4: return 142;
1061        case 0x00c5: return 143;
1062        case 0x00c9: return 144;
1063        case 0x00e6: return 145;
1064        case 0x00c6: return 146;
1065        case 0x00f4: return 147;
1066        case 0x00f6: return 148;
1067        case 0x00f2: return 149;
1068        case 0x00fb: return 150;
1069        case 0x00f9: return 151;
1070        case 0x00ff: return 152;
1071        case 0x00d6: return 153;
1072        case 0x00dc: return 154;
1073        case 0x00a2: return 155;
1074        case 0x00a3: return 156;
1075        case 0x00a5: return 157;
1076        case 0x20a7: return 158;
1077        case 0x0192: return 159;
1078        case 0x00e1: return 160;
1079        case 0x00ed: return 161;
1080        case 0x00f3: return 162;
1081        case 0x00fa: return 163;
1082        case 0x00f1: return 164;
1083        case 0x00d1: return 165;
1084        case 0x00aa: return 166;
1085        case 0x00ba: return 167;
1086        case 0x00bf: return 168;
1087        case 0x2310: return 169;
1088        case 0x00ac: return 170;
1089        case 0x00bd: return 171;
1090        case 0x00bc: return 172;
1091        case 0x00a1: return 173;
1092        case 0x00ab: return 174;
1093        case 0x00bb: return 175;
1094        case 0x2591: return 176;
1095        case 0x2592: return 177;
1096        case 0x2593: return 178;
1097        case 0x2502: return 179;
1098        case 0x2524: return 180;
1099        case 0x2561: return 181;
1100        case 0x2562: return 182;
1101        case 0x2556: return 183;
1102        case 0x2555: return 184;
1103        case 0x2563: return 185;
1104        case 0x2551: return 186;
1105        case 0x2557: return 187;
1106        case 0x255d: return 188;
1107        case 0x255c: return 189;
1108        case 0x255b: return 190;
1109        case 0x2510: return 191;
1110        case 0x2514: return 192;
1111        case 0x2534: return 193;
1112        case 0x252c: return 194;
1113        case 0x251c: return 195;
1114        case 0x2500: return 196;
1115        case 0x253c: return 197;
1116        case 0x255e: return 198;
1117        case 0x255f: return 199;
1118        case 0x255a: return 200;
1119        case 0x2554: return 201;
1120        case 0x2569: return 202;
1121        case 0x2566: return 203;
1122        case 0x2560: return 204;
1123        case 0x2550: return 205;
1124        case 0x256c: return 206;
1125        case 0x2567: return 207;
1126        case 0x2568: return 208;
1127        case 0x2564: return 209;
1128        case 0x2565: return 210;
1129        case 0x2559: return 211;
1130        case 0x2558: return 212;
1131        case 0x2552: return 213;
1132        case 0x2553: return 214;
1133        case 0x256b: return 215;
1134        case 0x256a: return 216;
1135        case 0x2518: return 217;
1136        case 0x250c: return 218;
1137        case 0x2588: return 219;
1138        case 0x2584: return 220;
1139        case 0x258c: return 221;
1140        case 0x2590: return 222;
1141        case 0x2580: return 223;
1142        case 0x03b1: return 224;
1143        case 0x00df: return 225;
1144        case 0x0393: return 226;
1145        case 0x03c0: return 227;
1146        case 0x03a3: return 228;
1147        case 0x03c3: return 229;
1148        case 0x00b5: return 230;
1149        case 0x03c4: return 231;
1150        case 0x03a6: return 232;
1151        case 0x0398: return 233;
1152        case 0x03a9: return 234;
1153        case 0x03b4: return 235;
1154        case 0x221e: return 236;
1155        case 0x03c6: return 237;
1156        case 0x03b5: return 238;
1157        case 0x2229: return 239;
1158        case 0x2261: return 240;
1159        case 0x00b1: return 241;
1160        case 0x2265: return 242;
1161        case 0x2264: return 243;
1162        case 0x2320: return 244;
1163        case 0x2321: return 245;
1164        case 0x00f7: return 246;
1165        case 0x2248: return 247;
1166        case 0x00b0: return 248;
1167        case 0x2219: return 249;
1168        case 0x00b7: return 250;
1169        case 0x221a: return 251;
1170        case 0x207f: return 252;
1171        case 0x00b2: return 253;
1172        case 0x25a0: return 254;
1173    }
1174
1175    return -1;
1176}
1177
1178static void term_putchar(struct term_context *ctx, uint8_t c) {
1179    if (ctx->discard_next || (ctx->in_bootloader == false && (c == 0x18 || c == 0x1a))) {
1180        ctx->discard_next = false;
1181        ctx->escape = false;
1182        ctx->csi = false;
1183        ctx->control_sequence = false;
1184        ctx->unicode_remaining = 0;
1185        ctx->osc = false;
1186        ctx->osc_escape = false;
1187        ctx->g_select = 0;
1188        return;
1189    }
1190
1191    if (ctx->unicode_remaining != 0) {
1192        if ((c & 0xc0) != 0x80) {
1193            ctx->unicode_remaining = 0;
1194            goto unicode_error;
1195        }
1196
1197        ctx->unicode_remaining--;
1198        ctx->code_point |= (c & 0x3f) << (6 * ctx->unicode_remaining);
1199        if (ctx->unicode_remaining != 0) {
1200            return;
1201        }
1202
1203        int cc = unicode_to_cp437(ctx->code_point);
1204
1205        if (cc == -1) {
1206            size_t replacement_width = mk_wcwidth(ctx->code_point);
1207            for (size_t i = 0; i < replacement_width; i++) {
1208                ctx->raw_putchar(ctx, 8);
1209            }
1210        } else {
1211            ctx->raw_putchar(ctx, cc);
1212        }
1213        return;
1214    }
1215
1216unicode_error:
1217    if (c >= 0xc0 && c <= 0xf7 && ctx->in_bootloader == false) {
1218        if (c >= 0xc0 && c <= 0xdf) {
1219            ctx->unicode_remaining = 1;
1220            ctx->code_point = (c & 0x1f) << 6;
1221        } else if (c >= 0xe0 && c <= 0xef) {
1222            ctx->unicode_remaining = 2;
1223            ctx->code_point = (c & 0x0f) << (6 * 2);
1224        } else if (c >= 0xf0 && c <= 0xf7) {
1225            ctx->unicode_remaining = 3;
1226            ctx->code_point = (c & 0x07) << (6 * 3);
1227        }
1228        return;
1229    }
1230
1231    if (ctx->escape == true) {
1232        escape_parse(ctx, c);
1233        return;
1234    }
1235
1236    if (ctx->g_select) {
1237        ctx->g_select--;
1238        switch (c) {
1239            case 'B':
1240                ctx->charsets[ctx->g_select] = CHARSET_DEFAULT; break;
1241            case '0':
1242                ctx->charsets[ctx->g_select] = CHARSET_DEC_SPECIAL; break;
1243        }
1244        ctx->g_select = 0;
1245        return;
1246    }
1247
1248    size_t x, y;
1249    ctx->get_cursor_pos(ctx, &x, &y);
1250
1251    switch (c) {
1252        case 0x00:
1253        case 0x7f:
1254            return;
1255        case 0x9b:
1256            ctx->csi = true;
1257            // FALLTHRU
1258        case 0x1b:
1259            ctx->escape_offset = 0;
1260            ctx->escape = true;
1261            return;
1262        case '\t':
1263            if ((x / ctx->tab_size + 1) >= ctx->cols) {
1264                ctx->set_cursor_pos(ctx, ctx->cols - 1, y);
1265                return;
1266            }
1267            ctx->set_cursor_pos(ctx, (x / ctx->tab_size + 1) * ctx->tab_size, y);
1268            return;
1269        case 0x0b:
1270        case 0x0c:
1271        case '\n':
1272            if (y == ctx->scroll_bottom_margin - 1) {
1273                ctx->scroll(ctx);
1274                ctx->set_cursor_pos(ctx, 0, y);
1275            } else {
1276                ctx->set_cursor_pos(ctx, 0, y + 1);
1277            }
1278            return;
1279        case '\b':
1280            ctx->set_cursor_pos(ctx, x - 1, y);
1281            return;
1282        case '\r':
1283            ctx->set_cursor_pos(ctx, 0, y);
1284            return;
1285        case '\a':
1286            // The bell is handled by the kernel
1287            if (ctx->callback != NULL) {
1288                ctx->callback(ctx, TERM_CB_BELL, 0, 0, 0);
1289            }
1290            return;
1291        case 14:
1292            // Move to G1 set
1293            ctx->current_charset = 1;
1294            return;
1295        case 15:
1296            // Move to G0 set
1297            ctx->current_charset = 0;
1298            return;
1299    }
1300
1301    if (ctx->insert_mode == true) {
1302        for (size_t i = ctx->cols - 1; ; i--) {
1303            ctx->move_character(ctx, i + 1, y, i, y);
1304            if (i == x) {
1305                break;
1306            }
1307        }
1308    }
1309
1310    // Translate character set
1311    switch (ctx->charsets[ctx->current_charset]) {
1312        case CHARSET_DEFAULT:
1313            break;
1314        case CHARSET_DEC_SPECIAL:
1315            c = dec_special_to_cp437(c);
1316            break;
1317    }
1318
1319    ctx->raw_putchar(ctx, c);
1320}