flanterm.c at b16d2649c02af0104392ff47263626e5ea6ca8a5 · pci.express/flanterm.zig

pci.express / flanterm.zig
Fast and reasonably complete (framebuffer) terminal emulator (Zig fork)
flanterm.zig / flanterm.c
at b16d2649c02af0104392ff47263626e5ea6ca8a5 45 kB view raw
   1/* Copyright (C) 2022-2025 mintsuki and contributors.
   2 *
   3 * Redistribution and use in source and binary forms, with or without
   4 * modification, are permitted provided that the following conditions are met:
   5 *
   6 * 1. Redistributions of source code must retain the above copyright notice,
   7 *    this list of conditions and the following disclaimer.
   8 *
   9 * 2. Redistributions in binary form must reproduce the above copyright notice,
  10 *    this list of conditions and the following disclaimer in the documentation
  11 *    and/or other materials provided with the distribution.
  12 *
  13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  17 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  23 * POSSIBILITY OF SUCH DAMAGE.
  24 */
  25
  26#include <stdint.h>
  27#include <stddef.h>
  28#include <stdbool.h>
  29
  30#include "flanterm.h"
  31
  32// Tries to implement this standard for terminfo
  33// https://man7.org/linux/man-pages/man4/console_codes.4.html
  34
  35static const uint32_t col256[] = {
  36    0x000000, 0x00005f, 0x000087, 0x0000af, 0x0000d7, 0x0000ff, 0x005f00, 0x005f5f,
  37    0x005f87, 0x005faf, 0x005fd7, 0x005fff, 0x008700, 0x00875f, 0x008787, 0x0087af,
  38    0x0087d7, 0x0087ff, 0x00af00, 0x00af5f, 0x00af87, 0x00afaf, 0x00afd7, 0x00afff,
  39    0x00d700, 0x00d75f, 0x00d787, 0x00d7af, 0x00d7d7, 0x00d7ff, 0x00ff00, 0x00ff5f,
  40    0x00ff87, 0x00ffaf, 0x00ffd7, 0x00ffff, 0x5f0000, 0x5f005f, 0x5f0087, 0x5f00af,
  41    0x5f00d7, 0x5f00ff, 0x5f5f00, 0x5f5f5f, 0x5f5f87, 0x5f5faf, 0x5f5fd7, 0x5f5fff,
  42    0x5f8700, 0x5f875f, 0x5f8787, 0x5f87af, 0x5f87d7, 0x5f87ff, 0x5faf00, 0x5faf5f,
  43    0x5faf87, 0x5fafaf, 0x5fafd7, 0x5fafff, 0x5fd700, 0x5fd75f, 0x5fd787, 0x5fd7af,
  44    0x5fd7d7, 0x5fd7ff, 0x5fff00, 0x5fff5f, 0x5fff87, 0x5fffaf, 0x5fffd7, 0x5fffff,
  45    0x870000, 0x87005f, 0x870087, 0x8700af, 0x8700d7, 0x8700ff, 0x875f00, 0x875f5f,
  46    0x875f87, 0x875faf, 0x875fd7, 0x875fff, 0x878700, 0x87875f, 0x878787, 0x8787af,
  47    0x8787d7, 0x8787ff, 0x87af00, 0x87af5f, 0x87af87, 0x87afaf, 0x87afd7, 0x87afff,
  48    0x87d700, 0x87d75f, 0x87d787, 0x87d7af, 0x87d7d7, 0x87d7ff, 0x87ff00, 0x87ff5f,
  49    0x87ff87, 0x87ffaf, 0x87ffd7, 0x87ffff, 0xaf0000, 0xaf005f, 0xaf0087, 0xaf00af,
  50    0xaf00d7, 0xaf00ff, 0xaf5f00, 0xaf5f5f, 0xaf5f87, 0xaf5faf, 0xaf5fd7, 0xaf5fff,
  51    0xaf8700, 0xaf875f, 0xaf8787, 0xaf87af, 0xaf87d7, 0xaf87ff, 0xafaf00, 0xafaf5f,
  52    0xafaf87, 0xafafaf, 0xafafd7, 0xafafff, 0xafd700, 0xafd75f, 0xafd787, 0xafd7af,
  53    0xafd7d7, 0xafd7ff, 0xafff00, 0xafff5f, 0xafff87, 0xafffaf, 0xafffd7, 0xafffff,
  54    0xd70000, 0xd7005f, 0xd70087, 0xd700af, 0xd700d7, 0xd700ff, 0xd75f00, 0xd75f5f,
  55    0xd75f87, 0xd75faf, 0xd75fd7, 0xd75fff, 0xd78700, 0xd7875f, 0xd78787, 0xd787af,
  56    0xd787d7, 0xd787ff, 0xd7af00, 0xd7af5f, 0xd7af87, 0xd7afaf, 0xd7afd7, 0xd7afff,
  57    0xd7d700, 0xd7d75f, 0xd7d787, 0xd7d7af, 0xd7d7d7, 0xd7d7ff, 0xd7ff00, 0xd7ff5f,
  58    0xd7ff87, 0xd7ffaf, 0xd7ffd7, 0xd7ffff, 0xff0000, 0xff005f, 0xff0087, 0xff00af,
  59    0xff00d7, 0xff00ff, 0xff5f00, 0xff5f5f, 0xff5f87, 0xff5faf, 0xff5fd7, 0xff5fff,
  60    0xff8700, 0xff875f, 0xff8787, 0xff87af, 0xff87d7, 0xff87ff, 0xffaf00, 0xffaf5f,
  61    0xffaf87, 0xffafaf, 0xffafd7, 0xffafff, 0xffd700, 0xffd75f, 0xffd787, 0xffd7af,
  62    0xffd7d7, 0xffd7ff, 0xffff00, 0xffff5f, 0xffff87, 0xffffaf, 0xffffd7, 0xffffff,
  63    0x080808, 0x121212, 0x1c1c1c, 0x262626, 0x303030, 0x3a3a3a, 0x444444, 0x4e4e4e,
  64    0x585858, 0x626262, 0x6c6c6c, 0x767676, 0x808080, 0x8a8a8a, 0x949494, 0x9e9e9e,
  65    0xa8a8a8, 0xb2b2b2, 0xbcbcbc, 0xc6c6c6, 0xd0d0d0, 0xdadada, 0xe4e4e4, 0xeeeeee
  66};
  67
  68#define CHARSET_DEFAULT 0
  69#define CHARSET_DEC_SPECIAL 1
  70
  71void flanterm_context_reinit(struct flanterm_context *ctx) {
  72    ctx->tab_size = 8;
  73    ctx->autoflush = true;
  74    ctx->cursor_enabled = true;
  75    ctx->scroll_enabled = true;
  76    ctx->control_sequence = false;
  77    ctx->escape = false;
  78    ctx->osc = false;
  79    ctx->osc_escape = false;
  80    ctx->rrr = false;
  81    ctx->discard_next = false;
  82    ctx->bold = false;
  83    ctx->bg_bold = false;
  84    ctx->reverse_video = false;
  85    ctx->dec_private = false;
  86    ctx->insert_mode = false;
  87    ctx->unicode_remaining = 0;
  88    ctx->g_select = 0;
  89    ctx->charsets[0] = CHARSET_DEFAULT;
  90    ctx->charsets[1] = CHARSET_DEC_SPECIAL;
  91    ctx->current_charset = 0;
  92    ctx->escape_offset = 0;
  93    ctx->esc_values_i = 0;
  94    ctx->saved_cursor_x = 0;
  95    ctx->saved_cursor_y = 0;
  96    ctx->current_primary = (size_t)-1;
  97    ctx->current_bg = (size_t)-1;
  98    ctx->scroll_top_margin = 0;
  99    ctx->scroll_bottom_margin = ctx->rows;
 100    ctx->oob_output = FLANTERM_OOB_OUTPUT_ONLCR;
 101}
 102
 103static void flanterm_putchar(struct flanterm_context *ctx, uint8_t c);
 104
 105void flanterm_write(struct flanterm_context *ctx, const char *buf, size_t count) {
 106    for (size_t i = 0; i < count; i++) {
 107        flanterm_putchar(ctx, buf[i]);
 108    }
 109
 110    if (ctx->autoflush) {
 111        ctx->double_buffer_flush(ctx);
 112    }
 113}
 114
 115static void sgr(struct flanterm_context *ctx) {
 116    size_t i = 0;
 117
 118    if (!ctx->esc_values_i)
 119        goto def;
 120
 121    for (; i < ctx->esc_values_i; i++) {
 122        size_t offset;
 123
 124        if (ctx->esc_values[i] == 0) {
 125def:
 126            if (ctx->reverse_video) {
 127                ctx->reverse_video = false;
 128                ctx->swap_palette(ctx);
 129            }
 130            ctx->bold = false;
 131            ctx->bg_bold = false;
 132            ctx->current_primary = (size_t)-1;
 133            ctx->current_bg = (size_t)-1;
 134            ctx->set_text_bg_default(ctx);
 135            ctx->set_text_fg_default(ctx);
 136            continue;
 137        }
 138
 139        else if (ctx->esc_values[i] == 1) {
 140            ctx->bold = true;
 141            if (ctx->current_primary != (size_t)-1) {
 142                if (!ctx->reverse_video) {
 143                    ctx->set_text_fg_bright(ctx, ctx->current_primary);
 144                } else {
 145                    ctx->set_text_bg_bright(ctx, ctx->current_primary);
 146                }
 147            } else {
 148                if (!ctx->reverse_video) {
 149                    ctx->set_text_fg_default_bright(ctx);
 150                } else {
 151                    ctx->set_text_bg_default_bright(ctx);
 152                }
 153            }
 154            continue;
 155        }
 156
 157        else if (ctx->esc_values[i] == 5) {
 158            ctx->bg_bold = true;
 159            if (ctx->current_bg != (size_t)-1) {
 160                if (!ctx->reverse_video) {
 161                    ctx->set_text_bg_bright(ctx, ctx->current_bg);
 162                } else {
 163                    ctx->set_text_fg_bright(ctx, ctx->current_bg);
 164                }
 165            } else {
 166                if (!ctx->reverse_video) {
 167                    ctx->set_text_bg_default_bright(ctx);
 168                } else {
 169                    ctx->set_text_fg_default_bright(ctx);
 170                }
 171            }
 172            continue;
 173        }
 174
 175        else if (ctx->esc_values[i] == 22) {
 176            ctx->bold = false;
 177            if (ctx->current_primary != (size_t)-1) {
 178                if (!ctx->reverse_video) {
 179                    ctx->set_text_fg(ctx, ctx->current_primary);
 180                } else {
 181                    ctx->set_text_bg(ctx, ctx->current_primary);
 182                }
 183            } else {
 184                if (!ctx->reverse_video) {
 185                    ctx->set_text_fg_default(ctx);
 186                } else {
 187                    ctx->set_text_bg_default(ctx);
 188                }
 189            }
 190            continue;
 191        }
 192
 193        else if (ctx->esc_values[i] == 25) {
 194            ctx->bg_bold = false;
 195            if (ctx->current_bg != (size_t)-1) {
 196                if (!ctx->reverse_video) {
 197                    ctx->set_text_bg(ctx, ctx->current_bg);
 198                } else {
 199                    ctx->set_text_fg(ctx, ctx->current_bg);
 200                }
 201            } else {
 202                if (!ctx->reverse_video) {
 203                    ctx->set_text_bg_default(ctx);
 204                } else {
 205                    ctx->set_text_fg_default(ctx);
 206                }
 207            }
 208            continue;
 209        }
 210
 211        else if (ctx->esc_values[i] >= 30 && ctx->esc_values[i] <= 37) {
 212            offset = 30;
 213            ctx->current_primary = ctx->esc_values[i] - offset;
 214
 215            if (ctx->reverse_video) {
 216                goto set_bg;
 217            }
 218
 219set_fg:
 220            if ((ctx->bold && !ctx->reverse_video)
 221             || (ctx->bg_bold && ctx->reverse_video)) {
 222                ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 223            } else {
 224                ctx->set_text_fg(ctx, ctx->esc_values[i] - offset);
 225            }
 226            continue;
 227        }
 228
 229        else if (ctx->esc_values[i] >= 40 && ctx->esc_values[i] <= 47) {
 230            offset = 40;
 231            ctx->current_bg = ctx->esc_values[i] - offset;
 232
 233            if (ctx->reverse_video) {
 234                goto set_fg;
 235            }
 236
 237set_bg:
 238            if ((ctx->bold && ctx->reverse_video)
 239             || (ctx->bg_bold && !ctx->reverse_video)) {
 240                ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 241            } else {
 242                ctx->set_text_bg(ctx, ctx->esc_values[i] - offset);
 243            }
 244            continue;
 245        }
 246
 247        else if (ctx->esc_values[i] >= 90 && ctx->esc_values[i] <= 97) {
 248            offset = 90;
 249            ctx->current_primary = ctx->esc_values[i] - offset;
 250
 251            if (ctx->reverse_video) {
 252                goto set_bg_bright;
 253            }
 254
 255set_fg_bright:
 256            ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 257            continue;
 258        }
 259
 260        else if (ctx->esc_values[i] >= 100 && ctx->esc_values[i] <= 107) {
 261            offset = 100;
 262            ctx->current_bg = ctx->esc_values[i] - offset;
 263
 264            if (ctx->reverse_video) {
 265                goto set_fg_bright;
 266            }
 267
 268set_bg_bright:
 269            ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 270            continue;
 271        }
 272
 273        else if (ctx->esc_values[i] == 39) {
 274            ctx->current_primary = (size_t)-1;
 275
 276            if (ctx->reverse_video) {
 277                ctx->swap_palette(ctx);
 278            }
 279
 280            if (!ctx->bold) {
 281                ctx->set_text_fg_default(ctx);
 282            } else {
 283                ctx->set_text_fg_default_bright(ctx);
 284            }
 285
 286            if (ctx->reverse_video) {
 287                ctx->swap_palette(ctx);
 288            }
 289
 290            continue;
 291        }
 292
 293        else if (ctx->esc_values[i] == 49) {
 294            ctx->current_bg = (size_t)-1;
 295
 296            if (ctx->reverse_video) {
 297                ctx->swap_palette(ctx);
 298            }
 299
 300            if (!ctx->bg_bold) {
 301                ctx->set_text_bg_default(ctx);
 302            } else {
 303                ctx->set_text_bg_default_bright(ctx);
 304            }
 305
 306            if (ctx->reverse_video) {
 307                ctx->swap_palette(ctx);
 308            }
 309
 310            continue;
 311        }
 312
 313        else if (ctx->esc_values[i] == 7) {
 314            if (!ctx->reverse_video) {
 315                ctx->reverse_video = true;
 316                ctx->swap_palette(ctx);
 317            }
 318            continue;
 319        }
 320
 321        else if (ctx->esc_values[i] == 27) {
 322            if (ctx->reverse_video) {
 323                ctx->reverse_video = false;
 324                ctx->swap_palette(ctx);
 325            }
 326            continue;
 327        }
 328
 329        // 256/RGB
 330        else if (ctx->esc_values[i] == 38 || ctx->esc_values[i] == 48) {
 331            bool fg = ctx->esc_values[i] == 38;
 332
 333            i++;
 334            if (i >= ctx->esc_values_i) {
 335                break;
 336            }
 337
 338            switch (ctx->esc_values[i]) {
 339                case 2: { // RGB
 340                    if (i + 3 >= ctx->esc_values_i) {
 341                        goto out;
 342                    }
 343
 344                    uint32_t rgb_value = 0;
 345
 346                    rgb_value |= ctx->esc_values[i + 1] << 16;
 347                    rgb_value |= ctx->esc_values[i + 2] << 8;
 348                    rgb_value |= ctx->esc_values[i + 3];
 349
 350                    i += 3;
 351
 352                    (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 353
 354                    break;
 355                }
 356                case 5: { // 256 colors
 357                    if (i + 1 >= ctx->esc_values_i) {
 358                        goto out;
 359                    }
 360
 361                    uint32_t col = ctx->esc_values[i + 1];
 362
 363                    i++;
 364
 365                    if (col < 8) {
 366                        (fg ? ctx->set_text_fg : ctx->set_text_bg)(ctx, col);
 367                    } else if (col < 16) {
 368                        (fg ? ctx->set_text_fg_bright : ctx->set_text_bg_bright)(ctx, col - 8);
 369                    } else if (col < 256) {
 370                        uint32_t rgb_value = col256[col - 16];
 371                        (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 372                    }
 373
 374                    break;
 375                }
 376                default: continue;
 377            }
 378        }
 379    }
 380
 381out:;
 382}
 383
 384static void dec_private_parse(struct flanterm_context *ctx, uint8_t c) {
 385    ctx->dec_private = false;
 386
 387    if (ctx->esc_values_i == 0) {
 388        return;
 389    }
 390
 391    bool set;
 392
 393    switch (c) {
 394        case 'h':
 395            set = true; break;
 396        case 'l':
 397            set = false; break;
 398        default:
 399            return;
 400    }
 401
 402    switch (ctx->esc_values[0]) {
 403        case 25: {
 404            if (set) {
 405                ctx->cursor_enabled = true;
 406            } else {
 407                ctx->cursor_enabled = false;
 408            }
 409            return;
 410        }
 411    }
 412
 413    if (ctx->callback != NULL) {
 414        ctx->callback(ctx, FLANTERM_CB_DEC, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 415    }
 416}
 417
 418static void linux_private_parse(struct flanterm_context *ctx) {
 419    if (ctx->esc_values_i == 0) {
 420        return;
 421    }
 422
 423    if (ctx->callback != NULL) {
 424        ctx->callback(ctx, FLANTERM_CB_LINUX, ctx->esc_values_i, (uintptr_t)ctx->esc_values, 0);
 425    }
 426}
 427
 428static void mode_toggle(struct flanterm_context *ctx, uint8_t c) {
 429    if (ctx->esc_values_i == 0) {
 430        return;
 431    }
 432
 433    bool set;
 434
 435    switch (c) {
 436        case 'h':
 437            set = true; break;
 438        case 'l':
 439            set = false; break;
 440        default:
 441            return;
 442    }
 443
 444    switch (ctx->esc_values[0]) {
 445        case 4:
 446            ctx->insert_mode = set; return;
 447    }
 448
 449    if (ctx->callback != NULL) {
 450        ctx->callback(ctx, FLANTERM_CB_MODE, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 451    }
 452}
 453
 454static void osc_parse(struct flanterm_context *ctx, uint8_t c) {
 455    if (ctx->osc_escape && c == '\\') {
 456        goto cleanup;
 457    }
 458
 459    ctx->osc_escape = false;
 460
 461    switch (c) {
 462        case 0x1b:
 463            ctx->osc_escape = true;
 464            return;
 465        case '\a':
 466        default:
 467            break;
 468    }
 469
 470cleanup:
 471    ctx->osc_escape = false;
 472    ctx->osc = false;
 473    ctx->escape = false;
 474}
 475
 476static void control_sequence_parse(struct flanterm_context *ctx, uint8_t c) {
 477    if (ctx->escape_offset == 2) {
 478        switch (c) {
 479            case '[':
 480                ctx->discard_next = true;
 481                goto cleanup;
 482            case '?':
 483                ctx->dec_private = true;
 484                return;
 485        }
 486    }
 487
 488    if (c >= '0' && c <= '9') {
 489        if (ctx->esc_values_i == FLANTERM_MAX_ESC_VALUES) {
 490            return;
 491        }
 492        ctx->rrr = true;
 493        ctx->esc_values[ctx->esc_values_i] *= 10;
 494        ctx->esc_values[ctx->esc_values_i] += c - '0';
 495        return;
 496    }
 497
 498    if (ctx->rrr == true) {
 499        ctx->esc_values_i++;
 500        ctx->rrr = false;
 501        if (c == ';')
 502            return;
 503    } else if (c == ';') {
 504        if (ctx->esc_values_i == FLANTERM_MAX_ESC_VALUES) {
 505            return;
 506        }
 507        ctx->esc_values[ctx->esc_values_i] = 0;
 508        ctx->esc_values_i++;
 509        return;
 510    }
 511
 512    size_t esc_default;
 513    switch (c) {
 514        case 'J': case 'K': case 'q':
 515            esc_default = 0; break;
 516        default:
 517            esc_default = 1; break;
 518    }
 519
 520    for (size_t i = ctx->esc_values_i; i < FLANTERM_MAX_ESC_VALUES; i++) {
 521        ctx->esc_values[i] = esc_default;
 522    }
 523
 524    if (ctx->dec_private == true) {
 525        dec_private_parse(ctx, c);
 526        goto cleanup;
 527    }
 528
 529    bool r = ctx->scroll_enabled;
 530    ctx->scroll_enabled = false;
 531    size_t x, y;
 532    ctx->get_cursor_pos(ctx, &x, &y);
 533
 534    switch (c) {
 535        case 'F':
 536            x = 0;
 537            // FALLTHRU
 538        case 'A': {
 539            if (ctx->esc_values[0] > y)
 540                ctx->esc_values[0] = y;
 541            size_t orig_y = y;
 542            size_t dest_y = y - ctx->esc_values[0];
 543            bool will_be_in_scroll_region = false;
 544            if ((ctx->scroll_top_margin >= dest_y && ctx->scroll_top_margin <= orig_y)
 545             || (ctx->scroll_bottom_margin >= dest_y && ctx->scroll_bottom_margin <= orig_y)) {
 546                will_be_in_scroll_region = true;
 547            }
 548            if (will_be_in_scroll_region && dest_y < ctx->scroll_top_margin) {
 549                dest_y = ctx->scroll_top_margin;
 550            }
 551            ctx->set_cursor_pos(ctx, x, dest_y);
 552            break;
 553        }
 554        case 'E':
 555            x = 0;
 556            // FALLTHRU
 557        case 'e':
 558        case 'B': {
 559            if (y + ctx->esc_values[0] > ctx->rows - 1)
 560                ctx->esc_values[0] = (ctx->rows - 1) - y;
 561            size_t orig_y = y;
 562            size_t dest_y = y + ctx->esc_values[0];
 563            bool will_be_in_scroll_region = false;
 564            if ((ctx->scroll_top_margin >= orig_y && ctx->scroll_top_margin <= dest_y)
 565             || (ctx->scroll_bottom_margin >= orig_y && ctx->scroll_bottom_margin <= dest_y)) {
 566                will_be_in_scroll_region = true;
 567            }
 568            if (will_be_in_scroll_region && dest_y >= ctx->scroll_bottom_margin) {
 569                dest_y = ctx->scroll_bottom_margin - 1;
 570            }
 571            ctx->set_cursor_pos(ctx, x, dest_y);
 572            break;
 573        }
 574        case 'a':
 575        case 'C':
 576            if (x + ctx->esc_values[0] > ctx->cols - 1)
 577                ctx->esc_values[0] = (ctx->cols - 1) - x;
 578            ctx->set_cursor_pos(ctx, x + ctx->esc_values[0], y);
 579            break;
 580        case 'D':
 581            if (ctx->esc_values[0] > x)
 582                ctx->esc_values[0] = x;
 583            ctx->set_cursor_pos(ctx, x - ctx->esc_values[0], y);
 584            break;
 585        case 'c':
 586            if (ctx->callback != NULL) {
 587                ctx->callback(ctx, FLANTERM_CB_PRIVATE_ID, 0, 0, 0);
 588            }
 589            break;
 590        case 'd':
 591            ctx->esc_values[0] -= 1;
 592            if (ctx->esc_values[0] >= ctx->rows)
 593                ctx->esc_values[0] = ctx->rows - 1;
 594            ctx->set_cursor_pos(ctx, x, ctx->esc_values[0]);
 595            break;
 596        case 'G':
 597        case '`':
 598            ctx->esc_values[0] -= 1;
 599            if (ctx->esc_values[0] >= ctx->cols)
 600                ctx->esc_values[0] = ctx->cols - 1;
 601            ctx->set_cursor_pos(ctx, ctx->esc_values[0], y);
 602            break;
 603        case 'H':
 604        case 'f':
 605            if (ctx->esc_values[0] != 0) {
 606                ctx->esc_values[0]--;
 607            }
 608            if (ctx->esc_values[1] != 0) {
 609                ctx->esc_values[1]--;
 610            }
 611            if (ctx->esc_values[1] >= ctx->cols)
 612                ctx->esc_values[1] = ctx->cols - 1;
 613            if (ctx->esc_values[0] >= ctx->rows)
 614                ctx->esc_values[0] = ctx->rows - 1;
 615            ctx->set_cursor_pos(ctx, ctx->esc_values[1], ctx->esc_values[0]);
 616            break;
 617        case 'M': {
 618            size_t count = ctx->esc_values[0] > ctx->rows ? ctx->rows : ctx->esc_values[0];
 619            for (size_t i = 0; i < count; i++) {
 620                ctx->scroll(ctx);
 621            }
 622            break;
 623        }
 624        case 'L': {
 625            size_t old_scroll_top_margin = ctx->scroll_top_margin;
 626            ctx->scroll_top_margin = y;
 627            size_t count = ctx->esc_values[0] > ctx->rows ? ctx->rows : ctx->esc_values[0];
 628            for (size_t i = 0; i < count; i++) {
 629                ctx->revscroll(ctx);
 630            }
 631            ctx->scroll_top_margin = old_scroll_top_margin;
 632            break;
 633        }
 634        case 'n':
 635            switch (ctx->esc_values[0]) {
 636                case 5:
 637                    if (ctx->callback != NULL) {
 638                        ctx->callback(ctx, FLANTERM_CB_STATUS_REPORT, 0, 0, 0);
 639                    }
 640                    break;
 641                case 6:
 642                    if (ctx->callback != NULL) {
 643                        ctx->callback(ctx, FLANTERM_CB_POS_REPORT, x + 1, y + 1, 0);
 644                    }
 645                    break;
 646            }
 647            break;
 648        case 'q':
 649            if (ctx->callback != NULL) {
 650                ctx->callback(ctx, FLANTERM_CB_KBD_LEDS, ctx->esc_values[0], 0, 0);
 651            }
 652            break;
 653        case 'J':
 654            switch (ctx->esc_values[0]) {
 655                case 0: {
 656                    size_t rows_remaining = ctx->rows - (y + 1);
 657                    size_t cols_diff = ctx->cols - (x + 1);
 658                    size_t to_clear = rows_remaining * ctx->cols + cols_diff + 1;
 659                    for (size_t i = 0; i < to_clear; i++) {
 660                        ctx->raw_putchar(ctx, ' ');
 661                    }
 662                    ctx->set_cursor_pos(ctx, x, y);
 663                    break;
 664                }
 665                case 1: {
 666                    ctx->set_cursor_pos(ctx, 0, 0);
 667                    bool b = false;
 668                    for (size_t yc = 0; yc < ctx->rows; yc++) {
 669                        for (size_t xc = 0; xc < ctx->cols; xc++) {
 670                            ctx->raw_putchar(ctx, ' ');
 671                            if (xc == x && yc == y) {
 672                                ctx->set_cursor_pos(ctx, x, y);
 673                                b = true;
 674                                break;
 675                            }
 676                        }
 677                        if (b == true)
 678                            break;
 679                    }
 680                    break;
 681                }
 682                case 2:
 683                case 3:
 684                    ctx->clear(ctx, false);
 685                    break;
 686            }
 687            break;
 688        case '@':
 689            for (size_t i = ctx->cols - 1; ; i--) {
 690                ctx->move_character(ctx, i + ctx->esc_values[0], y, i, y);
 691                ctx->set_cursor_pos(ctx, i, y);
 692                ctx->raw_putchar(ctx, ' ');
 693                if (i == x) {
 694                    break;
 695                }
 696            }
 697            ctx->set_cursor_pos(ctx, x, y);
 698            break;
 699        case 'P':
 700            for (size_t i = x + ctx->esc_values[0]; i < ctx->cols; i++)
 701                ctx->move_character(ctx, i - ctx->esc_values[0], y, i, y);
 702            ctx->set_cursor_pos(ctx, ctx->cols - ctx->esc_values[0], y);
 703            // FALLTHRU
 704        case 'X': {
 705            size_t count = ctx->esc_values[0] > ctx->cols ? ctx->cols : ctx->esc_values[0];
 706            for (size_t i = 0; i < count; i++)
 707                ctx->raw_putchar(ctx, ' ');
 708            ctx->set_cursor_pos(ctx, x, y);
 709            break;
 710        }
 711        case 'm':
 712            sgr(ctx);
 713            break;
 714        case 's':
 715            ctx->get_cursor_pos(ctx, &ctx->saved_cursor_x, &ctx->saved_cursor_y);
 716            break;
 717        case 'u':
 718            ctx->set_cursor_pos(ctx, ctx->saved_cursor_x, ctx->saved_cursor_y);
 719            break;
 720        case 'K':
 721            switch (ctx->esc_values[0]) {
 722                case 0: {
 723                    for (size_t i = x; i < ctx->cols; i++)
 724                        ctx->raw_putchar(ctx, ' ');
 725                    ctx->set_cursor_pos(ctx, x, y);
 726                    break;
 727                }
 728                case 1: {
 729                    ctx->set_cursor_pos(ctx, 0, y);
 730                    for (size_t i = 0; i < x; i++)
 731                        ctx->raw_putchar(ctx, ' ');
 732                    break;
 733                }
 734                case 2: {
 735                    ctx->set_cursor_pos(ctx, 0, y);
 736                    for (size_t i = 0; i < ctx->cols; i++)
 737                        ctx->raw_putchar(ctx, ' ');
 738                    ctx->set_cursor_pos(ctx, x, y);
 739                    break;
 740                }
 741            }
 742            break;
 743        case 'r':
 744            if (ctx->esc_values[0] == 0) {
 745                ctx->esc_values[0] = 1;
 746            }
 747            if (ctx->esc_values[1] == 0) {
 748                ctx->esc_values[1] = 1;
 749            }
 750            ctx->scroll_top_margin = 0;
 751            ctx->scroll_bottom_margin = ctx->rows;
 752            if (ctx->esc_values_i > 0) {
 753                ctx->scroll_top_margin = ctx->esc_values[0] - 1;
 754            }
 755            if (ctx->esc_values_i > 1) {
 756                ctx->scroll_bottom_margin = ctx->esc_values[1];
 757            }
 758            if (ctx->scroll_top_margin >= ctx->rows
 759             || ctx->scroll_bottom_margin > ctx->rows
 760             || ctx->scroll_top_margin >= (ctx->scroll_bottom_margin - 1)) {
 761                ctx->scroll_top_margin = 0;
 762                ctx->scroll_bottom_margin = ctx->rows;
 763            }
 764            ctx->set_cursor_pos(ctx, 0, 0);
 765            break;
 766        case 'l':
 767        case 'h':
 768            mode_toggle(ctx, c);
 769            break;
 770        case ']':
 771            linux_private_parse(ctx);
 772            break;
 773    }
 774
 775    ctx->scroll_enabled = r;
 776
 777cleanup:
 778    ctx->control_sequence = false;
 779    ctx->escape = false;
 780}
 781
 782static void restore_state(struct flanterm_context *ctx) {
 783    ctx->bold = ctx->saved_state_bold;
 784    ctx->bg_bold = ctx->saved_state_bg_bold;
 785    ctx->reverse_video = ctx->saved_state_reverse_video;
 786    ctx->current_charset = ctx->saved_state_current_charset;
 787    ctx->current_primary = ctx->saved_state_current_primary;
 788    ctx->current_bg = ctx->saved_state_current_bg;
 789
 790    ctx->restore_state(ctx);
 791}
 792
 793static void save_state(struct flanterm_context *ctx) {
 794    ctx->save_state(ctx);
 795
 796    ctx->saved_state_bold = ctx->bold;
 797    ctx->saved_state_bg_bold = ctx->bg_bold;
 798    ctx->saved_state_reverse_video = ctx->reverse_video;
 799    ctx->saved_state_current_charset = ctx->current_charset;
 800    ctx->saved_state_current_primary = ctx->current_primary;
 801    ctx->saved_state_current_bg = ctx->current_bg;
 802}
 803
 804static void escape_parse(struct flanterm_context *ctx, uint8_t c) {
 805    ctx->escape_offset++;
 806
 807    if (ctx->osc == true) {
 808        osc_parse(ctx, c);
 809        return;
 810    }
 811
 812    if (ctx->control_sequence == true) {
 813        control_sequence_parse(ctx, c);
 814        return;
 815    }
 816
 817    size_t x, y;
 818    ctx->get_cursor_pos(ctx, &x, &y);
 819
 820    switch (c) {
 821        case ']':
 822            ctx->osc_escape = false;
 823            ctx->osc = true;
 824            return;
 825        case '[':
 826            for (size_t i = 0; i < FLANTERM_MAX_ESC_VALUES; i++)
 827                ctx->esc_values[i] = 0;
 828            ctx->esc_values_i = 0;
 829            ctx->rrr = false;
 830            ctx->control_sequence = true;
 831            return;
 832        case '7':
 833            save_state(ctx);
 834            break;
 835        case '8':
 836            restore_state(ctx);
 837            break;
 838        case 'c':
 839            flanterm_context_reinit(ctx);
 840            ctx->clear(ctx, true);
 841            break;
 842        case 'D':
 843            if (y == ctx->scroll_bottom_margin - 1) {
 844                ctx->scroll(ctx);
 845                ctx->set_cursor_pos(ctx, x, y);
 846            } else {
 847                ctx->set_cursor_pos(ctx, x, y + 1);
 848            }
 849            break;
 850        case 'E':
 851            if (y == ctx->scroll_bottom_margin - 1) {
 852                ctx->scroll(ctx);
 853                ctx->set_cursor_pos(ctx, 0, y);
 854            } else {
 855                ctx->set_cursor_pos(ctx, 0, y + 1);
 856            }
 857            break;
 858        case 'M':
 859            // "Reverse linefeed"
 860            if (y == ctx->scroll_top_margin) {
 861                ctx->revscroll(ctx);
 862                ctx->set_cursor_pos(ctx, 0, y);
 863            } else {
 864                ctx->set_cursor_pos(ctx, 0, y - 1);
 865            }
 866            break;
 867        case 'Z':
 868            if (ctx->callback != NULL) {
 869                ctx->callback(ctx, FLANTERM_CB_PRIVATE_ID, 0, 0, 0);
 870            }
 871            break;
 872        case '(':
 873        case ')':
 874            ctx->g_select = c - '\'';
 875            break;
 876    }
 877
 878    ctx->escape = false;
 879}
 880
 881static bool dec_special_print(struct flanterm_context *ctx, uint8_t c) {
 882#define FLANTERM_DEC_SPCL_PRN(C) ctx->raw_putchar(ctx, (C)); return true;
 883    switch (c) {
 884        case '`': FLANTERM_DEC_SPCL_PRN(0x04)
 885        case '0': FLANTERM_DEC_SPCL_PRN(0xdb)
 886        case '-': FLANTERM_DEC_SPCL_PRN(0x18)
 887        case ',': FLANTERM_DEC_SPCL_PRN(0x1b)
 888        case '.': FLANTERM_DEC_SPCL_PRN(0x19)
 889        case 'a': FLANTERM_DEC_SPCL_PRN(0xb1)
 890        case 'f': FLANTERM_DEC_SPCL_PRN(0xf8)
 891        case 'g': FLANTERM_DEC_SPCL_PRN(0xf1)
 892        case 'h': FLANTERM_DEC_SPCL_PRN(0xb0)
 893        case 'j': FLANTERM_DEC_SPCL_PRN(0xd9)
 894        case 'k': FLANTERM_DEC_SPCL_PRN(0xbf)
 895        case 'l': FLANTERM_DEC_SPCL_PRN(0xda)
 896        case 'm': FLANTERM_DEC_SPCL_PRN(0xc0)
 897        case 'n': FLANTERM_DEC_SPCL_PRN(0xc5)
 898        case 'q': FLANTERM_DEC_SPCL_PRN(0xc4)
 899        case 's': FLANTERM_DEC_SPCL_PRN(0x5f)
 900        case 't': FLANTERM_DEC_SPCL_PRN(0xc3)
 901        case 'u': FLANTERM_DEC_SPCL_PRN(0xb4)
 902        case 'v': FLANTERM_DEC_SPCL_PRN(0xc1)
 903        case 'w': FLANTERM_DEC_SPCL_PRN(0xc2)
 904        case 'x': FLANTERM_DEC_SPCL_PRN(0xb3)
 905        case 'y': FLANTERM_DEC_SPCL_PRN(0xf3)
 906        case 'z': FLANTERM_DEC_SPCL_PRN(0xf2)
 907        case '~': FLANTERM_DEC_SPCL_PRN(0xfa)
 908        case '_': FLANTERM_DEC_SPCL_PRN(0xff)
 909        case '+': FLANTERM_DEC_SPCL_PRN(0x1a)
 910        case '{': FLANTERM_DEC_SPCL_PRN(0xe3)
 911        case '}': FLANTERM_DEC_SPCL_PRN(0x9c)
 912    }
 913#undef FLANTERM_DEC_SPCL_PRN
 914
 915    return false;
 916}
 917
 918// Following wcwidth related code inherited from:
 919// https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
 920
 921struct interval {
 922    uint32_t first;
 923    uint32_t last;
 924};
 925
 926/* auxiliary function for binary search in interval table */
 927static int bisearch(uint32_t ucs, const struct interval *table, int max) {
 928  int min = 0;
 929  int mid;
 930
 931  if (ucs < table[0].first || ucs > table[max].last)
 932    return 0;
 933  while (max >= min) {
 934    mid = (min + max) / 2;
 935    if (ucs > table[mid].last)
 936      min = mid + 1;
 937    else if (ucs < table[mid].first)
 938      max = mid - 1;
 939    else
 940      return 1;
 941  }
 942
 943  return 0;
 944}
 945
 946int mk_wcwidth(uint32_t ucs) {
 947  /* sorted list of non-overlapping intervals of non-spacing characters */
 948  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
 949  static const struct interval combining[] = {
 950    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
 951    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
 952    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
 953    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
 954    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
 955    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
 956    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
 957    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
 958    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
 959    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
 960    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
 961    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
 962    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
 963    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
 964    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
 965    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
 966    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
 967    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
 968    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
 969    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
 970    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
 971    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
 972    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
 973    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
 974    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
 975    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
 976    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
 977    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
 978    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
 979    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
 980    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
 981    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
 982    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
 983    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
 984    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
 985    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
 986    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
 987    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
 988    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
 989    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
 990    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
 991    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
 992    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
 993    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
 994    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
 995    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
 996    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
 997    { 0xE0100, 0xE01EF }
 998  };
 999
1000  /* test for 8-bit control characters */
1001  if (ucs == 0)
1002    return 0;
1003  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
1004    return 1;
1005
1006  /* binary search in table of non-spacing characters */
1007  if (bisearch(ucs, combining,
1008	       sizeof(combining) / sizeof(struct interval) - 1))
1009    return 0;
1010
1011  /* if we arrive here, ucs is not a combining or C0/C1 control character */
1012
1013  return 1 +
1014    (ucs >= 0x1100 &&
1015     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
1016      ucs == 0x2329 || ucs == 0x232a ||
1017      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
1018       ucs != 0x303f) ||                  /* CJK ... Yi */
1019      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
1020      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
1021      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
1022      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
1023      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
1024      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
1025      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
1026      (ucs >= 0x30000 && ucs <= 0x3fffd)));
1027}
1028
1029// End of https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c inherited code
1030
1031static int unicode_to_cp437(uint64_t code_point) {
1032    switch (code_point) {
1033        case 0x263a: return 1;
1034        case 0x263b: return 2;
1035        case 0x2665: return 3;
1036        case 0x2666: return 4;
1037        case 0x2663: return 5;
1038        case 0x2660: return 6;
1039        case 0x2022: return 7;
1040        case 0x25d8: return 8;
1041        case 0x25cb: return 9;
1042        case 0x25d9: return 10;
1043        case 0x2642: return 11;
1044        case 0x2640: return 12;
1045        case 0x266a: return 13;
1046        case 0x266b: return 14;
1047        case 0x263c: return 15;
1048        case 0x25ba: return 16;
1049        case 0x25c4: return 17;
1050        case 0x2195: return 18;
1051        case 0x203c: return 19;
1052        case 0x00b6: return 20;
1053        case 0x00a7: return 21;
1054        case 0x25ac: return 22;
1055        case 0x21a8: return 23;
1056        case 0x2191: return 24;
1057        case 0x2193: return 25;
1058        case 0x2192: return 26;
1059        case 0x2190: return 27;
1060        case 0x221f: return 28;
1061        case 0x2194: return 29;
1062        case 0x25b2: return 30;
1063        case 0x25bc: return 31;
1064
1065        case 0x2302: return 127;
1066        case 0x00c7: return 128;
1067        case 0x00fc: return 129;
1068        case 0x00e9: return 130;
1069        case 0x00e2: return 131;
1070        case 0x00e4: return 132;
1071        case 0x00e0: return 133;
1072        case 0x00e5: return 134;
1073        case 0x00e7: return 135;
1074        case 0x00ea: return 136;
1075        case 0x00eb: return 137;
1076        case 0x00e8: return 138;
1077        case 0x00ef: return 139;
1078        case 0x00ee: return 140;
1079        case 0x00ec: return 141;
1080        case 0x00c4: return 142;
1081        case 0x00c5: return 143;
1082        case 0x00c9: return 144;
1083        case 0x00e6: return 145;
1084        case 0x00c6: return 146;
1085        case 0x00f4: return 147;
1086        case 0x00f6: return 148;
1087        case 0x00f2: return 149;
1088        case 0x00fb: return 150;
1089        case 0x00f9: return 151;
1090        case 0x00ff: return 152;
1091        case 0x00d6: return 153;
1092        case 0x00dc: return 154;
1093        case 0x00a2: return 155;
1094        case 0x00a3: return 156;
1095        case 0x00a5: return 157;
1096        case 0x20a7: return 158;
1097        case 0x0192: return 159;
1098        case 0x00e1: return 160;
1099        case 0x00ed: return 161;
1100        case 0x00f3: return 162;
1101        case 0x00fa: return 163;
1102        case 0x00f1: return 164;
1103        case 0x00d1: return 165;
1104        case 0x00aa: return 166;
1105        case 0x00ba: return 167;
1106        case 0x00bf: return 168;
1107        case 0x2310: return 169;
1108        case 0x00ac: return 170;
1109        case 0x00bd: return 171;
1110        case 0x00bc: return 172;
1111        case 0x00a1: return 173;
1112        case 0x00ab: return 174;
1113        case 0x00bb: return 175;
1114        case 0x2591: return 176;
1115        case 0x2592: return 177;
1116        case 0x2593: return 178;
1117        case 0x2502: return 179;
1118        case 0x2524: return 180;
1119        case 0x2561: return 181;
1120        case 0x2562: return 182;
1121        case 0x2556: return 183;
1122        case 0x2555: return 184;
1123        case 0x2563: return 185;
1124        case 0x2551: return 186;
1125        case 0x2557: return 187;
1126        case 0x255d: return 188;
1127        case 0x255c: return 189;
1128        case 0x255b: return 190;
1129        case 0x2510: return 191;
1130        case 0x2514: return 192;
1131        case 0x2534: return 193;
1132        case 0x252c: return 194;
1133        case 0x251c: return 195;
1134        case 0x2500: return 196;
1135        case 0x253c: return 197;
1136        case 0x255e: return 198;
1137        case 0x255f: return 199;
1138        case 0x255a: return 200;
1139        case 0x2554: return 201;
1140        case 0x2569: return 202;
1141        case 0x2566: return 203;
1142        case 0x2560: return 204;
1143        case 0x2550: return 205;
1144        case 0x256c: return 206;
1145        case 0x2567: return 207;
1146        case 0x2568: return 208;
1147        case 0x2564: return 209;
1148        case 0x2565: return 210;
1149        case 0x2559: return 211;
1150        case 0x2558: return 212;
1151        case 0x2552: return 213;
1152        case 0x2553: return 214;
1153        case 0x256b: return 215;
1154        case 0x256a: return 216;
1155        case 0x2518: return 217;
1156        case 0x250c: return 218;
1157        case 0x2588: return 219;
1158        case 0x2584: return 220;
1159        case 0x258c: return 221;
1160        case 0x2590: return 222;
1161        case 0x2580: return 223;
1162        case 0x03b1: return 224;
1163        case 0x00df: return 225;
1164        case 0x0393: return 226;
1165        case 0x03c0: return 227;
1166        case 0x03a3: return 228;
1167        case 0x03c3: return 229;
1168        case 0x00b5: return 230;
1169        case 0x03c4: return 231;
1170        case 0x03a6: return 232;
1171        case 0x0398: return 233;
1172        case 0x03a9: return 234;
1173        case 0x03b4: return 235;
1174        case 0x221e: return 236;
1175        case 0x03c6: return 237;
1176        case 0x03b5: return 238;
1177        case 0x2229: return 239;
1178        case 0x2261: return 240;
1179        case 0x00b1: return 241;
1180        case 0x2265: return 242;
1181        case 0x2264: return 243;
1182        case 0x2320: return 244;
1183        case 0x2321: return 245;
1184        case 0x00f7: return 246;
1185        case 0x2248: return 247;
1186        case 0x00b0: return 248;
1187        case 0x2219: return 249;
1188        case 0x00b7: return 250;
1189        case 0x221a: return 251;
1190        case 0x207f: return 252;
1191        case 0x00b2: return 253;
1192        case 0x25a0: return 254;
1193    }
1194
1195    return -1;
1196}
1197
1198static void flanterm_putchar(struct flanterm_context *ctx, uint8_t c) {
1199    if (ctx->discard_next || (c == 0x18 || c == 0x1a)) {
1200        ctx->discard_next = false;
1201        ctx->escape = false;
1202        ctx->control_sequence = false;
1203        ctx->unicode_remaining = 0;
1204        ctx->osc = false;
1205        ctx->osc_escape = false;
1206        ctx->g_select = 0;
1207        return;
1208    }
1209
1210    if (ctx->unicode_remaining != 0) {
1211        if ((c & 0xc0) != 0x80) {
1212            ctx->unicode_remaining = 0;
1213            goto unicode_error;
1214        }
1215
1216        ctx->unicode_remaining--;
1217        ctx->code_point |= (uint64_t)(c & 0x3f) << (6 * ctx->unicode_remaining);
1218        if (ctx->unicode_remaining != 0) {
1219            return;
1220        }
1221
1222        int cc = unicode_to_cp437(ctx->code_point);
1223
1224        if (cc == -1) {
1225            size_t replacement_width = (size_t)mk_wcwidth(ctx->code_point);
1226            if (replacement_width > 0) {
1227                ctx->raw_putchar(ctx, 0xfe);
1228            }
1229            for (size_t i = 1; i < replacement_width; i++) {
1230                ctx->raw_putchar(ctx, ' ');
1231            }
1232        } else {
1233            ctx->raw_putchar(ctx, cc);
1234        }
1235        return;
1236    }
1237
1238unicode_error:
1239    if (c >= 0xc0 && c <= 0xf7) {
1240        if (c >= 0xc0 && c <= 0xdf) {
1241            ctx->unicode_remaining = 1;
1242            ctx->code_point = (uint64_t)(c & 0x1f) << 6;
1243        } else if (c >= 0xe0 && c <= 0xef) {
1244            ctx->unicode_remaining = 2;
1245            ctx->code_point = (uint64_t)(c & 0x0f) << (6 * 2);
1246        } else if (c >= 0xf0 && c <= 0xf7) {
1247            ctx->unicode_remaining = 3;
1248            ctx->code_point = (uint64_t)(c & 0x07) << (6 * 3);
1249        }
1250        return;
1251    }
1252
1253    if (ctx->escape == true) {
1254        escape_parse(ctx, c);
1255        return;
1256    }
1257
1258    if (ctx->g_select) {
1259        ctx->g_select--;
1260        switch (c) {
1261            case 'B':
1262                ctx->charsets[ctx->g_select] = CHARSET_DEFAULT; break;
1263            case '0':
1264                ctx->charsets[ctx->g_select] = CHARSET_DEC_SPECIAL; break;
1265        }
1266        ctx->g_select = 0;
1267        return;
1268    }
1269
1270    size_t x, y;
1271    ctx->get_cursor_pos(ctx, &x, &y);
1272
1273    switch (c) {
1274        case 0x00:
1275        case 0x7f:
1276            return;
1277        case 0x1b:
1278            ctx->escape_offset = 0;
1279            ctx->escape = true;
1280            return;
1281        case '\t':
1282            if ((x / ctx->tab_size + 1) >= ctx->cols) {
1283                ctx->set_cursor_pos(ctx, ctx->cols - 1, y);
1284                return;
1285            }
1286            ctx->set_cursor_pos(ctx, (x / ctx->tab_size + 1) * ctx->tab_size, y);
1287            return;
1288        case 0x0b:
1289        case 0x0c:
1290        case '\n':
1291            if (y == ctx->scroll_bottom_margin - 1) {
1292                ctx->scroll(ctx);
1293                ctx->set_cursor_pos(ctx, (ctx->oob_output & FLANTERM_OOB_OUTPUT_ONLCR) ? 0 : x, y);
1294            } else {
1295                ctx->set_cursor_pos(ctx, (ctx->oob_output & FLANTERM_OOB_OUTPUT_ONLCR) ? 0 : x, y + 1);
1296            }
1297            return;
1298        case '\b':
1299            ctx->set_cursor_pos(ctx, x - 1, y);
1300            return;
1301        case '\r':
1302            ctx->set_cursor_pos(ctx, 0, y);
1303            return;
1304        case '\a':
1305            // The bell is handled by the kernel
1306            if (ctx->callback != NULL) {
1307                ctx->callback(ctx, FLANTERM_CB_BELL, 0, 0, 0);
1308            }
1309            return;
1310        case 14:
1311            // Move to G1 set
1312            ctx->current_charset = 1;
1313            return;
1314        case 15:
1315            // Move to G0 set
1316            ctx->current_charset = 0;
1317            return;
1318    }
1319
1320    if (ctx->insert_mode == true) {
1321        for (size_t i = ctx->cols - 1; ; i--) {
1322            ctx->move_character(ctx, i + 1, y, i, y);
1323            if (i == x) {
1324                break;
1325            }
1326        }
1327    }
1328
1329    // Translate character set
1330    switch (ctx->charsets[ctx->current_charset]) {
1331        case CHARSET_DEFAULT:
1332            break;
1333        case CHARSET_DEC_SPECIAL:
1334            if (dec_special_print(ctx, c)) {
1335                return;
1336            }
1337            break;
1338    }
1339
1340    if (c >= 0x20 && c <= 0x7e) {
1341        ctx->raw_putchar(ctx, c);
1342    } else {
1343        ctx->raw_putchar(ctx, 0xfe);
1344    }
1345}