term.c at 5d3e0ddccf69c755706de7f3ddb94aa80c820b23 · pci.express/flanterm.zig

pci.express / flanterm.zig
Fast and reasonably complete (framebuffer) terminal emulator (Zig fork)
flanterm.zig / term.c
at 5d3e0ddccf69c755706de7f3ddb94aa80c820b23 42 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->scroll_enabled = true;
  50    ctx->control_sequence = false;
  51    ctx->csi = false;
  52    ctx->escape = false;
  53    ctx->osc = false;
  54    ctx->osc_escape = false;
  55    ctx->rrr = false;
  56    ctx->discard_next = false;
  57    ctx->bold = false;
  58    ctx->bg_bold = false;
  59    ctx->reverse_video = false;
  60    ctx->dec_private = false;
  61    ctx->insert_mode = false;
  62    ctx->unicode_remaining = 0;
  63    ctx->g_select = 0;
  64    ctx->charsets[0] = CHARSET_DEFAULT;
  65    ctx->charsets[1] = CHARSET_DEC_SPECIAL;
  66    ctx->current_charset = 0;
  67    ctx->escape_offset = 0;
  68    ctx->esc_values_i = 0;
  69    ctx->saved_cursor_x = 0;
  70    ctx->saved_cursor_y = 0;
  71    ctx->current_primary = (size_t)-1;
  72    ctx->current_bg = (size_t)-1;
  73    ctx->scroll_top_margin = 0;
  74    ctx->scroll_bottom_margin = ctx->rows;
  75}
  76
  77static void term_putchar(struct term_context *ctx, uint8_t c);
  78
  79void term_write(struct term_context *ctx, const char *buf, size_t count) {
  80    for (size_t i = 0; i < count; i++) {
  81        term_putchar(ctx, buf[i]);
  82    }
  83
  84    if (ctx->autoflush) {
  85        ctx->double_buffer_flush(ctx);
  86    }
  87}
  88
  89static void sgr(struct term_context *ctx) {
  90    size_t i = 0;
  91
  92    if (!ctx->esc_values_i)
  93        goto def;
  94
  95    for (; i < ctx->esc_values_i; i++) {
  96        size_t offset;
  97
  98        if (ctx->esc_values[i] == 0) {
  99def:
 100            if (ctx->reverse_video) {
 101                ctx->reverse_video = false;
 102                ctx->swap_palette(ctx);
 103            }
 104            ctx->bold = false;
 105            ctx->bg_bold = false;
 106            ctx->current_primary = (size_t)-1;
 107            ctx->current_bg = (size_t)-1;
 108            ctx->set_text_bg_default(ctx);
 109            ctx->set_text_fg_default(ctx);
 110            continue;
 111        }
 112
 113        else if (ctx->esc_values[i] == 1) {
 114            ctx->bold = true;
 115            if (ctx->current_primary != (size_t)-1) {
 116                if (!ctx->reverse_video) {
 117                    ctx->set_text_fg_bright(ctx, ctx->current_primary);
 118                } else {
 119                    ctx->set_text_bg_bright(ctx, ctx->current_primary);
 120                }
 121            } else {
 122                if (!ctx->reverse_video) {
 123                    ctx->set_text_fg_default_bright(ctx);
 124                } else {
 125                    ctx->set_text_bg_default_bright(ctx);
 126                }
 127            }
 128            continue;
 129        }
 130
 131        else if (ctx->esc_values[i] == 5) {
 132            ctx->bg_bold = true;
 133            if (ctx->current_bg != (size_t)-1) {
 134                if (!ctx->reverse_video) {
 135                    ctx->set_text_bg_bright(ctx, ctx->current_bg);
 136                } else {
 137                    ctx->set_text_fg_bright(ctx, ctx->current_bg);
 138                }
 139            } else {
 140                if (!ctx->reverse_video) {
 141                    ctx->set_text_bg_default_bright(ctx);
 142                } else {
 143                    ctx->set_text_fg_default_bright(ctx);
 144                }
 145            }
 146            continue;
 147        }
 148
 149        else if (ctx->esc_values[i] == 22) {
 150            ctx->bold = false;
 151            if (ctx->current_primary != (size_t)-1) {
 152                if (!ctx->reverse_video) {
 153                    ctx->set_text_fg(ctx, ctx->current_primary);
 154                } else {
 155                    ctx->set_text_bg(ctx, ctx->current_primary);
 156                }
 157            } else {
 158                if (!ctx->reverse_video) {
 159                    ctx->set_text_fg_default(ctx);
 160                } else {
 161                    ctx->set_text_bg_default(ctx);
 162                }
 163            }
 164            continue;
 165        }
 166
 167        else if (ctx->esc_values[i] == 25) {
 168            ctx->bg_bold = false;
 169            if (ctx->current_bg != (size_t)-1) {
 170                if (!ctx->reverse_video) {
 171                    ctx->set_text_bg(ctx, ctx->current_bg);
 172                } else {
 173                    ctx->set_text_fg(ctx, ctx->current_bg);
 174                }
 175            } else {
 176                if (!ctx->reverse_video) {
 177                    ctx->set_text_bg_default(ctx);
 178                } else {
 179                    ctx->set_text_fg_default(ctx);
 180                }
 181            }
 182            continue;
 183        }
 184
 185        else if (ctx->esc_values[i] >= 30 && ctx->esc_values[i] <= 37) {
 186            offset = 30;
 187            ctx->current_primary = ctx->esc_values[i] - offset;
 188
 189            if (ctx->reverse_video) {
 190                goto set_bg;
 191            }
 192
 193set_fg:
 194            if ((ctx->bold && !ctx->reverse_video)
 195             || (ctx->bg_bold && ctx->reverse_video)) {
 196                ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 197            } else {
 198                ctx->set_text_fg(ctx, ctx->esc_values[i] - offset);
 199            }
 200            continue;
 201        }
 202
 203        else if (ctx->esc_values[i] >= 40 && ctx->esc_values[i] <= 47) {
 204            offset = 40;
 205            ctx->current_bg = ctx->esc_values[i] - offset;
 206
 207            if (ctx->reverse_video) {
 208                goto set_fg;
 209            }
 210
 211set_bg:
 212            if ((ctx->bold && ctx->reverse_video)
 213             || (ctx->bg_bold && !ctx->reverse_video)) {
 214                ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 215            } else {
 216                ctx->set_text_bg(ctx, ctx->esc_values[i] - offset);
 217            }
 218            continue;
 219        }
 220
 221        else if (ctx->esc_values[i] >= 90 && ctx->esc_values[i] <= 97) {
 222            offset = 90;
 223            ctx->current_primary = ctx->esc_values[i] - offset;
 224
 225            if (ctx->reverse_video) {
 226                goto set_bg_bright;
 227            }
 228
 229set_fg_bright:
 230            ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 231            continue;
 232        }
 233
 234        else if (ctx->esc_values[i] >= 100 && ctx->esc_values[i] <= 107) {
 235            offset = 100;
 236            ctx->current_bg = ctx->esc_values[i] - offset;
 237
 238            if (ctx->reverse_video) {
 239                goto set_fg_bright;
 240            }
 241
 242set_bg_bright:
 243            ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 244            continue;
 245        }
 246
 247        else if (ctx->esc_values[i] == 39) {
 248            ctx->current_primary = (size_t)-1;
 249
 250            if (ctx->reverse_video) {
 251                ctx->swap_palette(ctx);
 252            }
 253
 254            if (!ctx->bold) {
 255                ctx->set_text_fg_default(ctx);
 256            } else {
 257                ctx->set_text_fg_default_bright(ctx);
 258            }
 259
 260            if (ctx->reverse_video) {
 261                ctx->swap_palette(ctx);
 262            }
 263
 264            continue;
 265        }
 266
 267        else if (ctx->esc_values[i] == 49) {
 268            ctx->current_bg = (size_t)-1;
 269
 270            if (ctx->reverse_video) {
 271                ctx->swap_palette(ctx);
 272            }
 273
 274            if (!ctx->bg_bold) {
 275                ctx->set_text_bg_default(ctx);
 276            } else {
 277                ctx->set_text_bg_default_bright(ctx);
 278            }
 279
 280            if (ctx->reverse_video) {
 281                ctx->swap_palette(ctx);
 282            }
 283
 284            continue;
 285        }
 286
 287        else if (ctx->esc_values[i] == 7) {
 288            if (!ctx->reverse_video) {
 289                ctx->reverse_video = true;
 290                ctx->swap_palette(ctx);
 291            }
 292            continue;
 293        }
 294
 295        else if (ctx->esc_values[i] == 27) {
 296            if (ctx->reverse_video) {
 297                ctx->reverse_video = false;
 298                ctx->swap_palette(ctx);
 299            }
 300            continue;
 301        }
 302
 303        // 256/RGB
 304        else if (ctx->esc_values[i] == 38 || ctx->esc_values[i] == 48) {
 305            bool fg = ctx->esc_values[i] == 38;
 306
 307            i++;
 308            if (i >= ctx->esc_values_i) {
 309                break;
 310            }
 311
 312            switch (ctx->esc_values[i]) {
 313                case 2: { // RGB
 314                    if (i + 3 >= ctx->esc_values_i) {
 315                        goto out;
 316                    }
 317
 318                    uint32_t rgb_value = 0;
 319
 320                    rgb_value |= ctx->esc_values[i + 1] << 16;
 321                    rgb_value |= ctx->esc_values[i + 2] << 8;
 322                    rgb_value |= ctx->esc_values[i + 3];
 323
 324                    i += 3;
 325
 326                    (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 327
 328                    break;
 329                }
 330                case 5: { // 256 colors
 331                    if (i + 1 >= ctx->esc_values_i) {
 332                        goto out;
 333                    }
 334
 335                    uint32_t col = ctx->esc_values[i + 1];
 336
 337                    i++;
 338
 339                    if (col < 8) {
 340                        (fg ? ctx->set_text_fg : ctx->set_text_bg)(ctx, col);
 341                    } else if (col < 16) {
 342                        (fg ? ctx->set_text_fg_bright : ctx->set_text_bg_bright)(ctx, col - 8);
 343                    } else {
 344                        uint32_t rgb_value = col256[col - 16];
 345                        (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 346                    }
 347
 348                    break;
 349                }
 350                default: continue;
 351            }
 352        }
 353    }
 354
 355out:;
 356}
 357
 358static void dec_private_parse(struct term_context *ctx, uint8_t c) {
 359    ctx->dec_private = false;
 360
 361    if (ctx->esc_values_i == 0) {
 362        return;
 363    }
 364
 365    bool set;
 366
 367    switch (c) {
 368        case 'h':
 369            set = true; break;
 370        case 'l':
 371            set = false; break;
 372        default:
 373            return;
 374    }
 375
 376    switch (ctx->esc_values[0]) {
 377        case 25: {
 378            if (set) {
 379                ctx->enable_cursor(ctx);
 380            } else {
 381                ctx->disable_cursor(ctx);
 382            }
 383            return;
 384        }
 385    }
 386
 387    if (ctx->callback != NULL) {
 388        ctx->callback(ctx, TERM_CB_DEC, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 389    }
 390}
 391
 392static void linux_private_parse(struct term_context *ctx) {
 393    if (ctx->esc_values_i == 0) {
 394        return;
 395    }
 396
 397    if (ctx->callback != NULL) {
 398        ctx->callback(ctx, TERM_CB_LINUX, ctx->esc_values_i, (uintptr_t)ctx->esc_values, 0);
 399    }
 400}
 401
 402static void mode_toggle(struct term_context *ctx, uint8_t c) {
 403    if (ctx->esc_values_i == 0) {
 404        return;
 405    }
 406
 407    bool set;
 408
 409    switch (c) {
 410        case 'h':
 411            set = true; break;
 412        case 'l':
 413            set = false; break;
 414        default:
 415            return;
 416    }
 417
 418    switch (ctx->esc_values[0]) {
 419        case 4:
 420            ctx->insert_mode = set; return;
 421    }
 422
 423    if (ctx->callback != NULL) {
 424        ctx->callback(ctx, TERM_CB_MODE, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 425    }
 426}
 427
 428static void osc_parse(struct term_context *ctx, uint8_t c) {
 429    if (ctx->osc_escape && c == '\\') {
 430        goto cleanup;
 431    }
 432
 433    ctx->osc_escape = false;
 434
 435    switch (c) {
 436        case 0x1b:
 437            ctx->osc_escape = true;
 438            break;
 439        case '\a':
 440            goto cleanup;
 441    }
 442
 443    return;
 444
 445cleanup:
 446    ctx->osc_escape = false;
 447    ctx->osc = false;
 448    ctx->escape = false;
 449}
 450
 451static void control_sequence_parse(struct term_context *ctx, uint8_t c) {
 452    if (ctx->escape_offset == 2) {
 453        switch (c) {
 454            case '[':
 455                ctx->discard_next = true;
 456                goto cleanup;
 457            case '?':
 458                ctx->dec_private = true;
 459                return;
 460        }
 461    }
 462
 463    if (c >= '0' && c <= '9') {
 464        if (ctx->esc_values_i == TERM_MAX_ESC_VALUES) {
 465            return;
 466        }
 467        ctx->rrr = true;
 468        ctx->esc_values[ctx->esc_values_i] *= 10;
 469        ctx->esc_values[ctx->esc_values_i] += c - '0';
 470        return;
 471    }
 472
 473    if (ctx->rrr == true) {
 474        ctx->esc_values_i++;
 475        ctx->rrr = false;
 476        if (c == ';')
 477            return;
 478    } else if (c == ';') {
 479        if (ctx->esc_values_i == TERM_MAX_ESC_VALUES) {
 480            return;
 481        }
 482        ctx->esc_values[ctx->esc_values_i] = 0;
 483        ctx->esc_values_i++;
 484        return;
 485    }
 486
 487    size_t esc_default;
 488    switch (c) {
 489        case 'J': case 'K': case 'q':
 490            esc_default = 0; break;
 491        default:
 492            esc_default = 1; break;
 493    }
 494
 495    for (size_t i = ctx->esc_values_i; i < TERM_MAX_ESC_VALUES; i++) {
 496        ctx->esc_values[i] = esc_default;
 497    }
 498
 499    if (ctx->dec_private == true) {
 500        dec_private_parse(ctx, c);
 501        goto cleanup;
 502    }
 503
 504    bool r = ctx->scroll_enabled;
 505    ctx->scroll_enabled = false;
 506    size_t x, y;
 507    ctx->get_cursor_pos(ctx, &x, &y);
 508
 509    switch (c) {
 510        case 'F':
 511            x = 0;
 512            // FALLTHRU
 513        case 'A': {
 514            if (ctx->esc_values[0] > y)
 515                ctx->esc_values[0] = y;
 516            size_t orig_y = y;
 517            size_t dest_y = y - ctx->esc_values[0];
 518            bool will_be_in_scroll_region = false;
 519            if ((ctx->scroll_top_margin >= dest_y && ctx->scroll_top_margin <= orig_y)
 520             || (ctx->scroll_bottom_margin >= dest_y && ctx->scroll_bottom_margin <= orig_y)) {
 521                will_be_in_scroll_region = true;
 522            }
 523            if (will_be_in_scroll_region && dest_y < ctx->scroll_top_margin) {
 524                dest_y = ctx->scroll_top_margin;
 525            }
 526            ctx->set_cursor_pos(ctx, x, dest_y);
 527            break;
 528        }
 529        case 'E':
 530            x = 0;
 531            // FALLTHRU
 532        case 'e':
 533        case 'B': {
 534            if (y + ctx->esc_values[0] > ctx->rows - 1)
 535                ctx->esc_values[0] = (ctx->rows - 1) - y;
 536            size_t orig_y = y;
 537            size_t dest_y = y + ctx->esc_values[0];
 538            bool will_be_in_scroll_region = false;
 539            if ((ctx->scroll_top_margin >= orig_y && ctx->scroll_top_margin <= dest_y)
 540             || (ctx->scroll_bottom_margin >= orig_y && ctx->scroll_bottom_margin <= dest_y)) {
 541                will_be_in_scroll_region = true;
 542            }
 543            if (will_be_in_scroll_region && dest_y >= ctx->scroll_bottom_margin) {
 544                dest_y = ctx->scroll_bottom_margin - 1;
 545            }
 546            ctx->set_cursor_pos(ctx, x, dest_y);
 547            break;
 548        }
 549        case 'a':
 550        case 'C':
 551            if (x + ctx->esc_values[0] > ctx->cols - 1)
 552                ctx->esc_values[0] = (ctx->cols - 1) - x;
 553            ctx->set_cursor_pos(ctx, x + ctx->esc_values[0], y);
 554            break;
 555        case 'D':
 556            if (ctx->esc_values[0] > x)
 557                ctx->esc_values[0] = x;
 558            ctx->set_cursor_pos(ctx, x - ctx->esc_values[0], y);
 559            break;
 560        case 'c':
 561            if (ctx->callback != NULL) {
 562                ctx->callback(ctx, TERM_CB_PRIVATE_ID, 0, 0, 0);
 563            }
 564            break;
 565        case 'd':
 566            ctx->esc_values[0] -= 1;
 567            if (ctx->esc_values[0] >= ctx->rows)
 568                ctx->esc_values[0] = ctx->rows - 1;
 569            ctx->set_cursor_pos(ctx, x, ctx->esc_values[0]);
 570            break;
 571        case 'G':
 572        case '`':
 573            ctx->esc_values[0] -= 1;
 574            if (ctx->esc_values[0] >= ctx->cols)
 575                ctx->esc_values[0] = ctx->cols - 1;
 576            ctx->set_cursor_pos(ctx, ctx->esc_values[0], y);
 577            break;
 578        case 'H':
 579        case 'f':
 580            if (ctx->esc_values[0] != 0) {
 581                ctx->esc_values[0]--;
 582            }
 583            if (ctx->esc_values[1] != 0) {
 584                ctx->esc_values[1]--;
 585            }
 586            if (ctx->esc_values[1] >= ctx->cols)
 587                ctx->esc_values[1] = ctx->cols - 1;
 588            if (ctx->esc_values[0] >= ctx->rows)
 589                ctx->esc_values[0] = ctx->rows - 1;
 590            ctx->set_cursor_pos(ctx, ctx->esc_values[1], ctx->esc_values[0]);
 591            break;
 592        case 'M':
 593            for (size_t i = 0; i < ctx->esc_values[0]; i++) {
 594                ctx->scroll(ctx);
 595            }
 596            break;
 597        case 'L': {
 598            size_t old_scroll_top_margin = ctx->scroll_top_margin;
 599            ctx->scroll_top_margin = y;
 600            for (size_t i = 0; i < ctx->esc_values[0]; i++) {
 601                ctx->revscroll(ctx);
 602            }
 603            ctx->scroll_top_margin = old_scroll_top_margin;
 604            break;
 605        }
 606        case 'n':
 607            switch (ctx->esc_values[0]) {
 608                case 5:
 609                    if (ctx->callback != NULL) {
 610                        ctx->callback(ctx, TERM_CB_STATUS_REPORT, 0, 0, 0);
 611                    }
 612                    break;
 613                case 6:
 614                    if (ctx->callback != NULL) {
 615                        ctx->callback(ctx, TERM_CB_POS_REPORT, x + 1, y + 1, 0);
 616                    }
 617                    break;
 618            }
 619            break;
 620        case 'q':
 621            if (ctx->callback != NULL) {
 622                ctx->callback(ctx, TERM_CB_KBD_LEDS, ctx->esc_values[0], 0, 0);
 623            }
 624            break;
 625        case 'J':
 626            switch (ctx->esc_values[0]) {
 627                case 0: {
 628                    size_t rows_remaining = ctx->rows - (y + 1);
 629                    size_t cols_diff = ctx->cols - (x + 1);
 630                    size_t to_clear = rows_remaining * ctx->cols + cols_diff + 1;
 631                    for (size_t i = 0; i < to_clear; i++) {
 632                        ctx->raw_putchar(ctx, ' ');
 633                    }
 634                    ctx->set_cursor_pos(ctx, x, y);
 635                    break;
 636                }
 637                case 1: {
 638                    ctx->set_cursor_pos(ctx, 0, 0);
 639                    bool b = false;
 640                    for (size_t yc = 0; yc < ctx->rows; yc++) {
 641                        for (size_t xc = 0; xc < ctx->cols; xc++) {
 642                            ctx->raw_putchar(ctx, ' ');
 643                            if (xc == x && yc == y) {
 644                                ctx->set_cursor_pos(ctx, x, y);
 645                                b = true;
 646                                break;
 647                            }
 648                        }
 649                        if (b == true)
 650                            break;
 651                    }
 652                    break;
 653                }
 654                case 2:
 655                case 3:
 656                    ctx->clear(ctx, false);
 657                    break;
 658            }
 659            break;
 660        case '@':
 661            for (size_t i = ctx->cols - 1; ; i--) {
 662                ctx->move_character(ctx, i + ctx->esc_values[0], y, i, y);
 663                ctx->set_cursor_pos(ctx, i, y);
 664                ctx->raw_putchar(ctx, ' ');
 665                if (i == x) {
 666                    break;
 667                }
 668            }
 669            ctx->set_cursor_pos(ctx, x, y);
 670            break;
 671        case 'P':
 672            for (size_t i = x + ctx->esc_values[0]; i < ctx->cols; i++)
 673                ctx->move_character(ctx, i - ctx->esc_values[0], y, i, y);
 674            ctx->set_cursor_pos(ctx, ctx->cols - ctx->esc_values[0], y);
 675            // FALLTHRU
 676        case 'X':
 677            for (size_t i = 0; i < ctx->esc_values[0]; i++)
 678                ctx->raw_putchar(ctx, ' ');
 679            ctx->set_cursor_pos(ctx, x, y);
 680            break;
 681        case 'm':
 682            sgr(ctx);
 683            break;
 684        case 's':
 685            ctx->get_cursor_pos(ctx, &ctx->saved_cursor_x, &ctx->saved_cursor_y);
 686            break;
 687        case 'u':
 688            ctx->set_cursor_pos(ctx, ctx->saved_cursor_x, ctx->saved_cursor_y);
 689            break;
 690        case 'K':
 691            switch (ctx->esc_values[0]) {
 692                case 0: {
 693                    for (size_t i = x; i < ctx->cols; i++)
 694                        ctx->raw_putchar(ctx, ' ');
 695                    ctx->set_cursor_pos(ctx, x, y);
 696                    break;
 697                }
 698                case 1: {
 699                    ctx->set_cursor_pos(ctx, 0, y);
 700                    for (size_t i = 0; i < x; i++)
 701                        ctx->raw_putchar(ctx, ' ');
 702                    break;
 703                }
 704                case 2: {
 705                    ctx->set_cursor_pos(ctx, 0, y);
 706                    for (size_t i = 0; i < ctx->cols; i++)
 707                        ctx->raw_putchar(ctx, ' ');
 708                    ctx->set_cursor_pos(ctx, x, y);
 709                    break;
 710                }
 711            }
 712            break;
 713        case 'r':
 714            if (ctx->esc_values[0] == 0) {
 715                ctx->esc_values[0] = 1;
 716            }
 717            if (ctx->esc_values[1] == 0) {
 718                ctx->esc_values[1] = 1;
 719            }
 720            ctx->scroll_top_margin = 0;
 721            ctx->scroll_bottom_margin = ctx->rows;
 722            if (ctx->esc_values_i > 0) {
 723                ctx->scroll_top_margin = ctx->esc_values[0] - 1;
 724            }
 725            if (ctx->esc_values_i > 1) {
 726                ctx->scroll_bottom_margin = ctx->esc_values[1];
 727            }
 728            if (ctx->scroll_top_margin >= ctx->rows
 729             || ctx->scroll_bottom_margin > ctx->rows
 730             || ctx->scroll_top_margin >= (ctx->scroll_bottom_margin - 1)) {
 731                ctx->scroll_top_margin = 0;
 732                ctx->scroll_bottom_margin = ctx->rows;
 733            }
 734            ctx->set_cursor_pos(ctx, 0, 0);
 735            break;
 736        case 'l':
 737        case 'h':
 738            mode_toggle(ctx, c);
 739            break;
 740        case ']':
 741            linux_private_parse(ctx);
 742            break;
 743    }
 744
 745    ctx->scroll_enabled = r;
 746
 747cleanup:
 748    ctx->control_sequence = false;
 749    ctx->escape = false;
 750}
 751
 752static void restore_state(struct term_context *ctx) {
 753    ctx->bold = ctx->saved_state_bold;
 754    ctx->bg_bold = ctx->saved_state_bg_bold;
 755    ctx->reverse_video = ctx->saved_state_reverse_video;
 756    ctx->current_charset = ctx->saved_state_current_charset;
 757    ctx->current_primary = ctx->saved_state_current_primary;
 758    ctx->current_bg = ctx->saved_state_current_bg;
 759
 760    ctx->restore_state(ctx);
 761}
 762
 763static void save_state(struct term_context *ctx) {
 764    ctx->save_state(ctx);
 765
 766    ctx->saved_state_bold = ctx->bold;
 767    ctx->saved_state_bg_bold = ctx->bg_bold;
 768    ctx->saved_state_reverse_video = ctx->reverse_video;
 769    ctx->saved_state_current_charset = ctx->current_charset;
 770    ctx->saved_state_current_primary = ctx->current_primary;
 771    ctx->saved_state_current_bg = ctx->current_bg;
 772}
 773
 774static void escape_parse(struct term_context *ctx, uint8_t c) {
 775    ctx->escape_offset++;
 776
 777    if (ctx->osc == true) {
 778        osc_parse(ctx, c);
 779        return;
 780    }
 781
 782    if (ctx->control_sequence == true) {
 783        control_sequence_parse(ctx, c);
 784        return;
 785    }
 786
 787    if (ctx->csi == true) {
 788        ctx->csi = false;
 789        goto is_csi;
 790    }
 791
 792    size_t x, y;
 793    ctx->get_cursor_pos(ctx, &x, &y);
 794
 795    switch (c) {
 796        case ']':
 797            ctx->osc_escape = false;
 798            ctx->osc = true;
 799            return;
 800        case '[':
 801is_csi:
 802            for (size_t i = 0; i < TERM_MAX_ESC_VALUES; i++)
 803                ctx->esc_values[i] = 0;
 804            ctx->esc_values_i = 0;
 805            ctx->rrr = false;
 806            ctx->control_sequence = true;
 807            return;
 808        case '7':
 809            save_state(ctx);
 810            break;
 811        case '8':
 812            restore_state(ctx);
 813            break;
 814        case 'c':
 815            term_context_reinit(ctx);
 816            ctx->clear(ctx, true);
 817            break;
 818        case 'D':
 819            if (y == ctx->scroll_bottom_margin - 1) {
 820                ctx->scroll(ctx);
 821                ctx->set_cursor_pos(ctx, x, y);
 822            } else {
 823                ctx->set_cursor_pos(ctx, x, y + 1);
 824            }
 825            break;
 826        case 'E':
 827            if (y == ctx->scroll_bottom_margin - 1) {
 828                ctx->scroll(ctx);
 829                ctx->set_cursor_pos(ctx, 0, y);
 830            } else {
 831                ctx->set_cursor_pos(ctx, 0, y + 1);
 832            }
 833            break;
 834        case 'M':
 835            // "Reverse linefeed"
 836            if (y == ctx->scroll_top_margin) {
 837                ctx->revscroll(ctx);
 838                ctx->set_cursor_pos(ctx, 0, y);
 839            } else {
 840                ctx->set_cursor_pos(ctx, 0, y - 1);
 841            }
 842            break;
 843        case 'Z':
 844            if (ctx->callback != NULL) {
 845                ctx->callback(ctx, TERM_CB_PRIVATE_ID, 0, 0, 0);
 846            }
 847            break;
 848        case '(':
 849        case ')':
 850            ctx->g_select = c - '\'';
 851            break;
 852        case 0x1b:
 853            if (ctx->in_bootloader == true) {
 854                ctx->raw_putchar(ctx, c);
 855            }
 856            break;
 857    }
 858
 859    ctx->escape = false;
 860}
 861
 862static uint8_t dec_special_to_cp437(uint8_t c) {
 863    switch (c) {
 864        case '`': return 0x04;
 865        case '0': return 0xdb;
 866        case '-': return 0x18;
 867        case ',': return 0x1b;
 868        case '.': return 0x19;
 869        case 'a': return 0xb1;
 870        case 'f': return 0xf8;
 871        case 'g': return 0xf1;
 872        case 'h': return 0xb0;
 873        case 'j': return 0xd9;
 874        case 'k': return 0xbf;
 875        case 'l': return 0xda;
 876        case 'm': return 0xc0;
 877        case 'n': return 0xc5;
 878        case 'q': return 0xc4;
 879        case 's': return 0x5f;
 880        case 't': return 0xc3;
 881        case 'u': return 0xb4;
 882        case 'v': return 0xc1;
 883        case 'w': return 0xc2;
 884        case 'x': return 0xb3;
 885        case 'y': return 0xf3;
 886        case 'z': return 0xf2;
 887        case '~': return 0xfa;
 888        case '_': return 0xff;
 889        case '+': return 0x1a;
 890        case '{': return 0xe3;
 891        case '}': return 0x9c;
 892    }
 893
 894    return c;
 895}
 896
 897// Following wcwidth related code inherited from:
 898// https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
 899
 900struct interval {
 901  wchar_t first;
 902  wchar_t last;
 903};
 904
 905/* auxiliary function for binary search in interval table */
 906static int bisearch(wchar_t ucs, const struct interval *table, int max) {
 907  int min = 0;
 908  int mid;
 909
 910  if (ucs < table[0].first || ucs > table[max].last)
 911    return 0;
 912  while (max >= min) {
 913    mid = (min + max) / 2;
 914    if (ucs > table[mid].last)
 915      min = mid + 1;
 916    else if (ucs < table[mid].first)
 917      max = mid - 1;
 918    else
 919      return 1;
 920  }
 921
 922  return 0;
 923}
 924
 925int mk_wcwidth(wchar_t ucs) {
 926  /* sorted list of non-overlapping intervals of non-spacing characters */
 927  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
 928  static const struct interval combining[] = {
 929    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
 930    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
 931    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
 932    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
 933    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
 934    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
 935    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
 936    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
 937    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
 938    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
 939    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
 940    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
 941    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
 942    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
 943    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
 944    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
 945    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
 946    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
 947    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
 948    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
 949    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
 950    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
 951    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
 952    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
 953    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
 954    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
 955    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
 956    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
 957    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
 958    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
 959    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
 960    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
 961    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
 962    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
 963    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
 964    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
 965    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
 966    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
 967    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
 968    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
 969    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
 970    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
 971    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
 972    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
 973    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
 974    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
 975    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
 976    { 0xE0100, 0xE01EF }
 977  };
 978
 979  /* test for 8-bit control characters */
 980  if (ucs == 0)
 981    return 0;
 982  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
 983    return 1;
 984
 985  /* binary search in table of non-spacing characters */
 986  if (bisearch(ucs, combining,
 987	       sizeof(combining) / sizeof(struct interval) - 1))
 988    return 0;
 989
 990  /* if we arrive here, ucs is not a combining or C0/C1 control character */
 991
 992  return 1 +
 993    (ucs >= 0x1100 &&
 994     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
 995      ucs == 0x2329 || ucs == 0x232a ||
 996      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
 997       ucs != 0x303f) ||                  /* CJK ... Yi */
 998      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
 999      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
1000      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
1001      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
1002      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
1003      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
1004      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
1005      (ucs >= 0x30000 && ucs <= 0x3fffd)));
1006}
1007
1008// End of https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c inherited code
1009
1010static int unicode_to_cp437(uint64_t code_point) {
1011    switch (code_point) {
1012        case 0x263a: return 1;
1013        case 0x263b: return 2;
1014        case 0x2665: return 3;
1015        case 0x2666: return 4;
1016        case 0x2663: return 5;
1017        case 0x2660: return 6;
1018        case 0x2022: return 7;
1019        case 0x25d8: return 8;
1020        case 0x25cb: return 9;
1021        case 0x25d9: return 10;
1022        case 0x2642: return 11;
1023        case 0x2640: return 12;
1024        case 0x266a: return 13;
1025        case 0x266b: return 14;
1026        case 0x263c: return 15;
1027        case 0x25ba: return 16;
1028        case 0x25c4: return 17;
1029        case 0x2195: return 18;
1030        case 0x203c: return 19;
1031        case 0x00b6: return 20;
1032        case 0x00a7: return 21;
1033        case 0x25ac: return 22;
1034        case 0x21a8: return 23;
1035        case 0x2191: return 24;
1036        case 0x2193: return 25;
1037        case 0x2192: return 26;
1038        case 0x2190: return 27;
1039        case 0x221f: return 28;
1040        case 0x2194: return 29;
1041        case 0x25b2: return 30;
1042        case 0x25bc: return 31;
1043
1044        case 0x2302: return 127;
1045        case 0x00c7: return 128;
1046        case 0x00fc: return 129;
1047        case 0x00e9: return 130;
1048        case 0x00e2: return 131;
1049        case 0x00e4: return 132;
1050        case 0x00e0: return 133;
1051        case 0x00e5: return 134;
1052        case 0x00e7: return 135;
1053        case 0x00ea: return 136;
1054        case 0x00eb: return 137;
1055        case 0x00e8: return 138;
1056        case 0x00ef: return 139;
1057        case 0x00ee: return 140;
1058        case 0x00ec: return 141;
1059        case 0x00c4: return 142;
1060        case 0x00c5: return 143;
1061        case 0x00c9: return 144;
1062        case 0x00e6: return 145;
1063        case 0x00c6: return 146;
1064        case 0x00f4: return 147;
1065        case 0x00f6: return 148;
1066        case 0x00f2: return 149;
1067        case 0x00fb: return 150;
1068        case 0x00f9: return 151;
1069        case 0x00ff: return 152;
1070        case 0x00d6: return 153;
1071        case 0x00dc: return 154;
1072        case 0x00a2: return 155;
1073        case 0x00a3: return 156;
1074        case 0x00a5: return 157;
1075        case 0x20a7: return 158;
1076        case 0x0192: return 159;
1077        case 0x00e1: return 160;
1078        case 0x00ed: return 161;
1079        case 0x00f3: return 162;
1080        case 0x00fa: return 163;
1081        case 0x00f1: return 164;
1082        case 0x00d1: return 165;
1083        case 0x00aa: return 166;
1084        case 0x00ba: return 167;
1085        case 0x00bf: return 168;
1086        case 0x2310: return 169;
1087        case 0x00ac: return 170;
1088        case 0x00bd: return 171;
1089        case 0x00bc: return 172;
1090        case 0x00a1: return 173;
1091        case 0x00ab: return 174;
1092        case 0x00bb: return 175;
1093        case 0x2591: return 176;
1094        case 0x2592: return 177;
1095        case 0x2593: return 178;
1096        case 0x2502: return 179;
1097        case 0x2524: return 180;
1098        case 0x2561: return 181;
1099        case 0x2562: return 182;
1100        case 0x2556: return 183;
1101        case 0x2555: return 184;
1102        case 0x2563: return 185;
1103        case 0x2551: return 186;
1104        case 0x2557: return 187;
1105        case 0x255d: return 188;
1106        case 0x255c: return 189;
1107        case 0x255b: return 190;
1108        case 0x2510: return 191;
1109        case 0x2514: return 192;
1110        case 0x2534: return 193;
1111        case 0x252c: return 194;
1112        case 0x251c: return 195;
1113        case 0x2500: return 196;
1114        case 0x253c: return 197;
1115        case 0x255e: return 198;
1116        case 0x255f: return 199;
1117        case 0x255a: return 200;
1118        case 0x2554: return 201;
1119        case 0x2569: return 202;
1120        case 0x2566: return 203;
1121        case 0x2560: return 204;
1122        case 0x2550: return 205;
1123        case 0x256c: return 206;
1124        case 0x2567: return 207;
1125        case 0x2568: return 208;
1126        case 0x2564: return 209;
1127        case 0x2565: return 210;
1128        case 0x2559: return 211;
1129        case 0x2558: return 212;
1130        case 0x2552: return 213;
1131        case 0x2553: return 214;
1132        case 0x256b: return 215;
1133        case 0x256a: return 216;
1134        case 0x2518: return 217;
1135        case 0x250c: return 218;
1136        case 0x2588: return 219;
1137        case 0x2584: return 220;
1138        case 0x258c: return 221;
1139        case 0x2590: return 222;
1140        case 0x2580: return 223;
1141        case 0x03b1: return 224;
1142        case 0x00df: return 225;
1143        case 0x0393: return 226;
1144        case 0x03c0: return 227;
1145        case 0x03a3: return 228;
1146        case 0x03c3: return 229;
1147        case 0x00b5: return 230;
1148        case 0x03c4: return 231;
1149        case 0x03a6: return 232;
1150        case 0x0398: return 233;
1151        case 0x03a9: return 234;
1152        case 0x03b4: return 235;
1153        case 0x221e: return 236;
1154        case 0x03c6: return 237;
1155        case 0x03b5: return 238;
1156        case 0x2229: return 239;
1157        case 0x2261: return 240;
1158        case 0x00b1: return 241;
1159        case 0x2265: return 242;
1160        case 0x2264: return 243;
1161        case 0x2320: return 244;
1162        case 0x2321: return 245;
1163        case 0x00f7: return 246;
1164        case 0x2248: return 247;
1165        case 0x00b0: return 248;
1166        case 0x2219: return 249;
1167        case 0x00b7: return 250;
1168        case 0x221a: return 251;
1169        case 0x207f: return 252;
1170        case 0x00b2: return 253;
1171        case 0x25a0: return 254;
1172    }
1173
1174    return -1;
1175}
1176
1177static void term_putchar(struct term_context *ctx, uint8_t c) {
1178    if (ctx->discard_next || (ctx->in_bootloader == false && (c == 0x18 || c == 0x1a))) {
1179        ctx->discard_next = false;
1180        ctx->escape = false;
1181        ctx->csi = false;
1182        ctx->control_sequence = false;
1183        ctx->unicode_remaining = 0;
1184        ctx->osc = false;
1185        ctx->osc_escape = false;
1186        ctx->g_select = 0;
1187        return;
1188    }
1189
1190    if (ctx->unicode_remaining != 0) {
1191        if ((c & 0xc0) != 0x80) {
1192            ctx->unicode_remaining = 0;
1193            goto unicode_error;
1194        }
1195
1196        ctx->unicode_remaining--;
1197        ctx->code_point |= (c & 0x3f) << (6 * ctx->unicode_remaining);
1198        if (ctx->unicode_remaining != 0) {
1199            return;
1200        }
1201
1202        int cc = unicode_to_cp437(ctx->code_point);
1203
1204        if (cc == -1) {
1205            size_t replacement_width = mk_wcwidth(ctx->code_point);
1206            for (size_t i = 0; i < replacement_width; i++) {
1207                ctx->raw_putchar(ctx, 8);
1208            }
1209        } else {
1210            ctx->raw_putchar(ctx, cc);
1211        }
1212        return;
1213    }
1214
1215unicode_error:
1216    if (c >= 0xc0 && c <= 0xf7 && ctx->in_bootloader == false) {
1217        if (c >= 0xc0 && c <= 0xdf) {
1218            ctx->unicode_remaining = 1;
1219            ctx->code_point = (c & 0x1f) << 6;
1220        } else if (c >= 0xe0 && c <= 0xef) {
1221            ctx->unicode_remaining = 2;
1222            ctx->code_point = (c & 0x0f) << (6 * 2);
1223        } else if (c >= 0xf0 && c <= 0xf7) {
1224            ctx->unicode_remaining = 3;
1225            ctx->code_point = (c & 0x07) << (6 * 3);
1226        }
1227        return;
1228    }
1229
1230    if (ctx->escape == true) {
1231        escape_parse(ctx, c);
1232        return;
1233    }
1234
1235    if (ctx->g_select) {
1236        ctx->g_select--;
1237        switch (c) {
1238            case 'B':
1239                ctx->charsets[ctx->g_select] = CHARSET_DEFAULT; break;
1240            case '0':
1241                ctx->charsets[ctx->g_select] = CHARSET_DEC_SPECIAL; break;
1242        }
1243        ctx->g_select = 0;
1244        return;
1245    }
1246
1247    size_t x, y;
1248    ctx->get_cursor_pos(ctx, &x, &y);
1249
1250    switch (c) {
1251        case 0x00:
1252        case 0x7f:
1253            return;
1254        case 0x9b:
1255            ctx->csi = true;
1256            // FALLTHRU
1257        case 0x1b:
1258            ctx->escape_offset = 0;
1259            ctx->escape = true;
1260            return;
1261        case '\t':
1262            if ((x / ctx->tab_size + 1) >= ctx->cols) {
1263                ctx->set_cursor_pos(ctx, ctx->cols - 1, y);
1264                return;
1265            }
1266            ctx->set_cursor_pos(ctx, (x / ctx->tab_size + 1) * ctx->tab_size, y);
1267            return;
1268        case 0x0b:
1269        case 0x0c:
1270        case '\n':
1271            if (y == ctx->scroll_bottom_margin - 1) {
1272                ctx->scroll(ctx);
1273                ctx->set_cursor_pos(ctx, 0, y);
1274            } else {
1275                ctx->set_cursor_pos(ctx, 0, y + 1);
1276            }
1277            return;
1278        case '\b':
1279            ctx->set_cursor_pos(ctx, x - 1, y);
1280            return;
1281        case '\r':
1282            ctx->set_cursor_pos(ctx, 0, y);
1283            return;
1284        case '\a':
1285            // The bell is handled by the kernel
1286            if (ctx->callback != NULL) {
1287                ctx->callback(ctx, TERM_CB_BELL, 0, 0, 0);
1288            }
1289            return;
1290        case 14:
1291            // Move to G1 set
1292            ctx->current_charset = 1;
1293            return;
1294        case 15:
1295            // Move to G0 set
1296            ctx->current_charset = 0;
1297            return;
1298    }
1299
1300    if (ctx->insert_mode == true) {
1301        for (size_t i = ctx->cols - 1; ; i--) {
1302            ctx->move_character(ctx, i + 1, y, i, y);
1303            if (i == x) {
1304                break;
1305            }
1306        }
1307    }
1308
1309    // Translate character set
1310    switch (ctx->charsets[ctx->current_charset]) {
1311        case CHARSET_DEFAULT:
1312            break;
1313        case CHARSET_DEC_SPECIAL:
1314            c = dec_special_to_cp437(c);
1315            break;
1316    }
1317
1318    ctx->raw_putchar(ctx, c);
1319}