flanterm.c at bdecdcb1b7dad05ab5249e2c3e4d2c27a661e864 · pci.express/flanterm.zig

pci.express / flanterm.zig
Fast and reasonably complete (framebuffer) terminal emulator (Zig fork)
flanterm.zig / flanterm.c
at bdecdcb1b7dad05ab5249e2c3e4d2c27a661e864 46 kB view raw
   1/* Copyright (C) 2022-2025 mintsuki and contributors.
   2 *
   3 * Redistribution and use in source and binary forms, with or without
   4 * modification, are permitted provided that the following conditions are met:
   5 *
   6 * 1. Redistributions of source code must retain the above copyright notice,
   7 *    this list of conditions and the following disclaimer.
   8 *
   9 * 2. Redistributions in binary form must reproduce the above copyright notice,
  10 *    this list of conditions and the following disclaimer in the documentation
  11 *    and/or other materials provided with the distribution.
  12 *
  13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  17 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  23 * POSSIBILITY OF SUCH DAMAGE.
  24 */
  25
  26#ifdef __cplusplus
  27#error "Please do not compile Flanterm as C++ code! Flanterm should be compiled as C99 or newer."
  28#endif
  29
  30#ifndef __STDC_VERSION__
  31#error "Flanterm must be compiled as C99 or newer."
  32#endif
  33
  34#include <stdint.h>
  35#include <stddef.h>
  36#include <stdbool.h>
  37
  38#define FLANTERM_IN_FLANTERM
  39
  40#include "flanterm.h"
  41
  42// Tries to implement this standard for terminfo
  43// https://man7.org/linux/man-pages/man4/console_codes.4.html
  44
  45static const uint32_t col256[] = {
  46    0x000000, 0x00005f, 0x000087, 0x0000af, 0x0000d7, 0x0000ff, 0x005f00, 0x005f5f,
  47    0x005f87, 0x005faf, 0x005fd7, 0x005fff, 0x008700, 0x00875f, 0x008787, 0x0087af,
  48    0x0087d7, 0x0087ff, 0x00af00, 0x00af5f, 0x00af87, 0x00afaf, 0x00afd7, 0x00afff,
  49    0x00d700, 0x00d75f, 0x00d787, 0x00d7af, 0x00d7d7, 0x00d7ff, 0x00ff00, 0x00ff5f,
  50    0x00ff87, 0x00ffaf, 0x00ffd7, 0x00ffff, 0x5f0000, 0x5f005f, 0x5f0087, 0x5f00af,
  51    0x5f00d7, 0x5f00ff, 0x5f5f00, 0x5f5f5f, 0x5f5f87, 0x5f5faf, 0x5f5fd7, 0x5f5fff,
  52    0x5f8700, 0x5f875f, 0x5f8787, 0x5f87af, 0x5f87d7, 0x5f87ff, 0x5faf00, 0x5faf5f,
  53    0x5faf87, 0x5fafaf, 0x5fafd7, 0x5fafff, 0x5fd700, 0x5fd75f, 0x5fd787, 0x5fd7af,
  54    0x5fd7d7, 0x5fd7ff, 0x5fff00, 0x5fff5f, 0x5fff87, 0x5fffaf, 0x5fffd7, 0x5fffff,
  55    0x870000, 0x87005f, 0x870087, 0x8700af, 0x8700d7, 0x8700ff, 0x875f00, 0x875f5f,
  56    0x875f87, 0x875faf, 0x875fd7, 0x875fff, 0x878700, 0x87875f, 0x878787, 0x8787af,
  57    0x8787d7, 0x8787ff, 0x87af00, 0x87af5f, 0x87af87, 0x87afaf, 0x87afd7, 0x87afff,
  58    0x87d700, 0x87d75f, 0x87d787, 0x87d7af, 0x87d7d7, 0x87d7ff, 0x87ff00, 0x87ff5f,
  59    0x87ff87, 0x87ffaf, 0x87ffd7, 0x87ffff, 0xaf0000, 0xaf005f, 0xaf0087, 0xaf00af,
  60    0xaf00d7, 0xaf00ff, 0xaf5f00, 0xaf5f5f, 0xaf5f87, 0xaf5faf, 0xaf5fd7, 0xaf5fff,
  61    0xaf8700, 0xaf875f, 0xaf8787, 0xaf87af, 0xaf87d7, 0xaf87ff, 0xafaf00, 0xafaf5f,
  62    0xafaf87, 0xafafaf, 0xafafd7, 0xafafff, 0xafd700, 0xafd75f, 0xafd787, 0xafd7af,
  63    0xafd7d7, 0xafd7ff, 0xafff00, 0xafff5f, 0xafff87, 0xafffaf, 0xafffd7, 0xafffff,
  64    0xd70000, 0xd7005f, 0xd70087, 0xd700af, 0xd700d7, 0xd700ff, 0xd75f00, 0xd75f5f,
  65    0xd75f87, 0xd75faf, 0xd75fd7, 0xd75fff, 0xd78700, 0xd7875f, 0xd78787, 0xd787af,
  66    0xd787d7, 0xd787ff, 0xd7af00, 0xd7af5f, 0xd7af87, 0xd7afaf, 0xd7afd7, 0xd7afff,
  67    0xd7d700, 0xd7d75f, 0xd7d787, 0xd7d7af, 0xd7d7d7, 0xd7d7ff, 0xd7ff00, 0xd7ff5f,
  68    0xd7ff87, 0xd7ffaf, 0xd7ffd7, 0xd7ffff, 0xff0000, 0xff005f, 0xff0087, 0xff00af,
  69    0xff00d7, 0xff00ff, 0xff5f00, 0xff5f5f, 0xff5f87, 0xff5faf, 0xff5fd7, 0xff5fff,
  70    0xff8700, 0xff875f, 0xff8787, 0xff87af, 0xff87d7, 0xff87ff, 0xffaf00, 0xffaf5f,
  71    0xffaf87, 0xffafaf, 0xffafd7, 0xffafff, 0xffd700, 0xffd75f, 0xffd787, 0xffd7af,
  72    0xffd7d7, 0xffd7ff, 0xffff00, 0xffff5f, 0xffff87, 0xffffaf, 0xffffd7, 0xffffff,
  73    0x080808, 0x121212, 0x1c1c1c, 0x262626, 0x303030, 0x3a3a3a, 0x444444, 0x4e4e4e,
  74    0x585858, 0x626262, 0x6c6c6c, 0x767676, 0x808080, 0x8a8a8a, 0x949494, 0x9e9e9e,
  75    0xa8a8a8, 0xb2b2b2, 0xbcbcbc, 0xc6c6c6, 0xd0d0d0, 0xdadada, 0xe4e4e4, 0xeeeeee
  76};
  77
  78#define CHARSET_DEFAULT 0
  79#define CHARSET_DEC_SPECIAL 1
  80
  81void flanterm_context_reinit(struct flanterm_context *ctx) {
  82    ctx->tab_size = 8;
  83    ctx->autoflush = true;
  84    ctx->cursor_enabled = true;
  85    ctx->scroll_enabled = true;
  86    ctx->control_sequence = false;
  87    ctx->escape = false;
  88    ctx->osc = false;
  89    ctx->osc_escape = false;
  90    ctx->rrr = false;
  91    ctx->discard_next = false;
  92    ctx->bold = false;
  93    ctx->bg_bold = false;
  94    ctx->reverse_video = false;
  95    ctx->dec_private = false;
  96    ctx->insert_mode = false;
  97    ctx->unicode_remaining = 0;
  98    ctx->g_select = 0;
  99    ctx->charsets[0] = CHARSET_DEFAULT;
 100    ctx->charsets[1] = CHARSET_DEC_SPECIAL;
 101    ctx->current_charset = 0;
 102    ctx->escape_offset = 0;
 103    ctx->esc_values_i = 0;
 104    ctx->saved_cursor_x = 0;
 105    ctx->saved_cursor_y = 0;
 106    ctx->current_primary = (size_t)-1;
 107    ctx->current_bg = (size_t)-1;
 108    ctx->scroll_top_margin = 0;
 109    ctx->scroll_bottom_margin = ctx->rows;
 110    ctx->oob_output = FLANTERM_OOB_OUTPUT_ONLCR;
 111}
 112
 113static void flanterm_putchar(struct flanterm_context *ctx, uint8_t c);
 114
 115void flanterm_write(struct flanterm_context *ctx, const char *buf, size_t count) {
 116    for (size_t i = 0; i < count; i++) {
 117        flanterm_putchar(ctx, buf[i]);
 118    }
 119
 120    if (ctx->autoflush) {
 121        ctx->double_buffer_flush(ctx);
 122    }
 123}
 124
 125static void sgr(struct flanterm_context *ctx) {
 126    size_t i = 0;
 127
 128    if (!ctx->esc_values_i)
 129        goto def;
 130
 131    for (; i < ctx->esc_values_i; i++) {
 132        size_t offset;
 133
 134        if (ctx->esc_values[i] == 0) {
 135def:
 136            if (ctx->reverse_video) {
 137                ctx->reverse_video = false;
 138                ctx->swap_palette(ctx);
 139            }
 140            ctx->bold = false;
 141            ctx->bg_bold = false;
 142            ctx->current_primary = (size_t)-1;
 143            ctx->current_bg = (size_t)-1;
 144            ctx->set_text_bg_default(ctx);
 145            ctx->set_text_fg_default(ctx);
 146            continue;
 147        }
 148
 149        else if (ctx->esc_values[i] == 1) {
 150            ctx->bold = true;
 151            if (ctx->current_primary != (size_t)-1) {
 152                if (!ctx->reverse_video) {
 153                    ctx->set_text_fg_bright(ctx, ctx->current_primary);
 154                } else {
 155                    ctx->set_text_bg_bright(ctx, ctx->current_primary);
 156                }
 157            } else {
 158                if (!ctx->reverse_video) {
 159                    ctx->set_text_fg_default_bright(ctx);
 160                } else {
 161                    ctx->set_text_bg_default_bright(ctx);
 162                }
 163            }
 164            continue;
 165        }
 166
 167        else if (ctx->esc_values[i] == 5) {
 168            ctx->bg_bold = true;
 169            if (ctx->current_bg != (size_t)-1) {
 170                if (!ctx->reverse_video) {
 171                    ctx->set_text_bg_bright(ctx, ctx->current_bg);
 172                } else {
 173                    ctx->set_text_fg_bright(ctx, ctx->current_bg);
 174                }
 175            } else {
 176                if (!ctx->reverse_video) {
 177                    ctx->set_text_bg_default_bright(ctx);
 178                } else {
 179                    ctx->set_text_fg_default_bright(ctx);
 180                }
 181            }
 182            continue;
 183        }
 184
 185        else if (ctx->esc_values[i] == 22) {
 186            ctx->bold = false;
 187            if (ctx->current_primary != (size_t)-1) {
 188                if (!ctx->reverse_video) {
 189                    ctx->set_text_fg(ctx, ctx->current_primary);
 190                } else {
 191                    ctx->set_text_bg(ctx, ctx->current_primary);
 192                }
 193            } else {
 194                if (!ctx->reverse_video) {
 195                    ctx->set_text_fg_default(ctx);
 196                } else {
 197                    ctx->set_text_bg_default(ctx);
 198                }
 199            }
 200            continue;
 201        }
 202
 203        else if (ctx->esc_values[i] == 25) {
 204            ctx->bg_bold = false;
 205            if (ctx->current_bg != (size_t)-1) {
 206                if (!ctx->reverse_video) {
 207                    ctx->set_text_bg(ctx, ctx->current_bg);
 208                } else {
 209                    ctx->set_text_fg(ctx, ctx->current_bg);
 210                }
 211            } else {
 212                if (!ctx->reverse_video) {
 213                    ctx->set_text_bg_default(ctx);
 214                } else {
 215                    ctx->set_text_fg_default(ctx);
 216                }
 217            }
 218            continue;
 219        }
 220
 221        else if (ctx->esc_values[i] >= 30 && ctx->esc_values[i] <= 37) {
 222            offset = 30;
 223            ctx->current_primary = ctx->esc_values[i] - offset;
 224
 225            if (ctx->reverse_video) {
 226                goto set_bg;
 227            }
 228
 229set_fg:
 230            if ((ctx->bold && !ctx->reverse_video)
 231             || (ctx->bg_bold && ctx->reverse_video)) {
 232                ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 233            } else {
 234                ctx->set_text_fg(ctx, ctx->esc_values[i] - offset);
 235            }
 236            continue;
 237        }
 238
 239        else if (ctx->esc_values[i] >= 40 && ctx->esc_values[i] <= 47) {
 240            offset = 40;
 241            ctx->current_bg = ctx->esc_values[i] - offset;
 242
 243            if (ctx->reverse_video) {
 244                goto set_fg;
 245            }
 246
 247set_bg:
 248            if ((ctx->bold && ctx->reverse_video)
 249             || (ctx->bg_bold && !ctx->reverse_video)) {
 250                ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 251            } else {
 252                ctx->set_text_bg(ctx, ctx->esc_values[i] - offset);
 253            }
 254            continue;
 255        }
 256
 257        else if (ctx->esc_values[i] >= 90 && ctx->esc_values[i] <= 97) {
 258            offset = 90;
 259            ctx->current_primary = ctx->esc_values[i] - offset;
 260
 261            if (ctx->reverse_video) {
 262                goto set_bg_bright;
 263            }
 264
 265set_fg_bright:
 266            ctx->set_text_fg_bright(ctx, ctx->esc_values[i] - offset);
 267            continue;
 268        }
 269
 270        else if (ctx->esc_values[i] >= 100 && ctx->esc_values[i] <= 107) {
 271            offset = 100;
 272            ctx->current_bg = ctx->esc_values[i] - offset;
 273
 274            if (ctx->reverse_video) {
 275                goto set_fg_bright;
 276            }
 277
 278set_bg_bright:
 279            ctx->set_text_bg_bright(ctx, ctx->esc_values[i] - offset);
 280            continue;
 281        }
 282
 283        else if (ctx->esc_values[i] == 39) {
 284            ctx->current_primary = (size_t)-1;
 285
 286            if (ctx->reverse_video) {
 287                ctx->swap_palette(ctx);
 288            }
 289
 290            if (!ctx->bold) {
 291                ctx->set_text_fg_default(ctx);
 292            } else {
 293                ctx->set_text_fg_default_bright(ctx);
 294            }
 295
 296            if (ctx->reverse_video) {
 297                ctx->swap_palette(ctx);
 298            }
 299
 300            continue;
 301        }
 302
 303        else if (ctx->esc_values[i] == 49) {
 304            ctx->current_bg = (size_t)-1;
 305
 306            if (ctx->reverse_video) {
 307                ctx->swap_palette(ctx);
 308            }
 309
 310            if (!ctx->bg_bold) {
 311                ctx->set_text_bg_default(ctx);
 312            } else {
 313                ctx->set_text_bg_default_bright(ctx);
 314            }
 315
 316            if (ctx->reverse_video) {
 317                ctx->swap_palette(ctx);
 318            }
 319
 320            continue;
 321        }
 322
 323        else if (ctx->esc_values[i] == 7) {
 324            if (!ctx->reverse_video) {
 325                ctx->reverse_video = true;
 326                ctx->swap_palette(ctx);
 327            }
 328            continue;
 329        }
 330
 331        else if (ctx->esc_values[i] == 27) {
 332            if (ctx->reverse_video) {
 333                ctx->reverse_video = false;
 334                ctx->swap_palette(ctx);
 335            }
 336            continue;
 337        }
 338
 339        // 256/RGB
 340        else if (ctx->esc_values[i] == 38 || ctx->esc_values[i] == 48) {
 341            bool fg = ctx->esc_values[i] == 38;
 342
 343            i++;
 344            if (i >= ctx->esc_values_i) {
 345                break;
 346            }
 347
 348            switch (ctx->esc_values[i]) {
 349                case 2: { // RGB
 350                    if (i + 3 >= ctx->esc_values_i) {
 351                        goto out;
 352                    }
 353
 354                    uint32_t rgb_value = 0;
 355
 356                    rgb_value |= ctx->esc_values[i + 1] << 16;
 357                    rgb_value |= ctx->esc_values[i + 2] << 8;
 358                    rgb_value |= ctx->esc_values[i + 3];
 359
 360                    i += 3;
 361
 362                    (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 363
 364                    break;
 365                }
 366                case 5: { // 256 colors
 367                    if (i + 1 >= ctx->esc_values_i) {
 368                        goto out;
 369                    }
 370
 371                    uint32_t col = ctx->esc_values[i + 1];
 372
 373                    i++;
 374
 375                    if (col < 8) {
 376                        (fg ? ctx->set_text_fg : ctx->set_text_bg)(ctx, col);
 377                    } else if (col < 16) {
 378                        (fg ? ctx->set_text_fg_bright : ctx->set_text_bg_bright)(ctx, col - 8);
 379                    } else if (col < 256) {
 380                        uint32_t rgb_value = col256[col - 16];
 381                        (fg ? ctx->set_text_fg_rgb : ctx->set_text_bg_rgb)(ctx, rgb_value);
 382                    }
 383
 384                    break;
 385                }
 386                default: continue;
 387            }
 388        }
 389    }
 390
 391out:;
 392}
 393
 394static void dec_private_parse(struct flanterm_context *ctx, uint8_t c) {
 395    ctx->dec_private = false;
 396
 397    if (ctx->esc_values_i == 0) {
 398        return;
 399    }
 400
 401    bool set;
 402
 403    switch (c) {
 404        case 'h':
 405            set = true; break;
 406        case 'l':
 407            set = false; break;
 408        default:
 409            return;
 410    }
 411
 412    switch (ctx->esc_values[0]) {
 413        case 25: {
 414            if (set) {
 415                ctx->cursor_enabled = true;
 416            } else {
 417                ctx->cursor_enabled = false;
 418            }
 419            return;
 420        }
 421    }
 422
 423    if (ctx->callback != NULL) {
 424        ctx->callback(ctx, FLANTERM_CB_DEC, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 425    }
 426}
 427
 428static void linux_private_parse(struct flanterm_context *ctx) {
 429    if (ctx->esc_values_i == 0) {
 430        return;
 431    }
 432
 433    if (ctx->callback != NULL) {
 434        ctx->callback(ctx, FLANTERM_CB_LINUX, ctx->esc_values_i, (uintptr_t)ctx->esc_values, 0);
 435    }
 436}
 437
 438static void mode_toggle(struct flanterm_context *ctx, uint8_t c) {
 439    if (ctx->esc_values_i == 0) {
 440        return;
 441    }
 442
 443    bool set;
 444
 445    switch (c) {
 446        case 'h':
 447            set = true; break;
 448        case 'l':
 449            set = false; break;
 450        default:
 451            return;
 452    }
 453
 454    switch (ctx->esc_values[0]) {
 455        case 4:
 456            ctx->insert_mode = set; return;
 457    }
 458
 459    if (ctx->callback != NULL) {
 460        ctx->callback(ctx, FLANTERM_CB_MODE, ctx->esc_values_i, (uintptr_t)ctx->esc_values, c);
 461    }
 462}
 463
 464static void osc_parse(struct flanterm_context *ctx, uint8_t c) {
 465    if (ctx->osc_escape && c == '\\') {
 466        goto cleanup;
 467    }
 468
 469    ctx->osc_escape = false;
 470
 471    switch (c) {
 472        case 0x1b:
 473            ctx->osc_escape = true;
 474            return;
 475        case '\a':
 476        default:
 477            break;
 478    }
 479
 480cleanup:
 481    ctx->osc_escape = false;
 482    ctx->osc = false;
 483    ctx->escape = false;
 484}
 485
 486static void control_sequence_parse(struct flanterm_context *ctx, uint8_t c) {
 487    if (ctx->escape_offset == 2) {
 488        switch (c) {
 489            case '[':
 490                ctx->discard_next = true;
 491                goto cleanup;
 492            case '?':
 493                ctx->dec_private = true;
 494                return;
 495        }
 496    }
 497
 498    if (c >= '0' && c <= '9') {
 499        if (ctx->esc_values_i == FLANTERM_MAX_ESC_VALUES) {
 500            return;
 501        }
 502        ctx->rrr = true;
 503        ctx->esc_values[ctx->esc_values_i] *= 10;
 504        ctx->esc_values[ctx->esc_values_i] += c - '0';
 505        return;
 506    }
 507
 508    if (ctx->rrr == true) {
 509        ctx->esc_values_i++;
 510        ctx->rrr = false;
 511        if (c == ';')
 512            return;
 513    } else if (c == ';') {
 514        if (ctx->esc_values_i == FLANTERM_MAX_ESC_VALUES) {
 515            return;
 516        }
 517        ctx->esc_values[ctx->esc_values_i] = 0;
 518        ctx->esc_values_i++;
 519        return;
 520    }
 521
 522    size_t esc_default;
 523    switch (c) {
 524        case 'J': case 'K': case 'q':
 525            esc_default = 0; break;
 526        default:
 527            esc_default = 1; break;
 528    }
 529
 530    for (size_t i = ctx->esc_values_i; i < FLANTERM_MAX_ESC_VALUES; i++) {
 531        ctx->esc_values[i] = esc_default;
 532    }
 533
 534    if (ctx->dec_private == true) {
 535        dec_private_parse(ctx, c);
 536        goto cleanup;
 537    }
 538
 539    bool r = ctx->scroll_enabled;
 540    ctx->scroll_enabled = false;
 541    size_t x, y;
 542    ctx->get_cursor_pos(ctx, &x, &y);
 543
 544    switch (c) {
 545        case 'F':
 546            x = 0;
 547            // FALLTHRU
 548        case 'A': {
 549            if (ctx->esc_values[0] > y)
 550                ctx->esc_values[0] = y;
 551            size_t orig_y = y;
 552            size_t dest_y = y - ctx->esc_values[0];
 553            bool will_be_in_scroll_region = false;
 554            if ((ctx->scroll_top_margin >= dest_y && ctx->scroll_top_margin <= orig_y)
 555             || (ctx->scroll_bottom_margin >= dest_y && ctx->scroll_bottom_margin <= orig_y)) {
 556                will_be_in_scroll_region = true;
 557            }
 558            if (will_be_in_scroll_region && dest_y < ctx->scroll_top_margin) {
 559                dest_y = ctx->scroll_top_margin;
 560            }
 561            ctx->set_cursor_pos(ctx, x, dest_y);
 562            break;
 563        }
 564        case 'E':
 565            x = 0;
 566            // FALLTHRU
 567        case 'e':
 568        case 'B': {
 569            if (y + ctx->esc_values[0] > ctx->rows - 1)
 570                ctx->esc_values[0] = (ctx->rows - 1) - y;
 571            size_t orig_y = y;
 572            size_t dest_y = y + ctx->esc_values[0];
 573            bool will_be_in_scroll_region = false;
 574            if ((ctx->scroll_top_margin >= orig_y && ctx->scroll_top_margin <= dest_y)
 575             || (ctx->scroll_bottom_margin >= orig_y && ctx->scroll_bottom_margin <= dest_y)) {
 576                will_be_in_scroll_region = true;
 577            }
 578            if (will_be_in_scroll_region && dest_y >= ctx->scroll_bottom_margin) {
 579                dest_y = ctx->scroll_bottom_margin - 1;
 580            }
 581            ctx->set_cursor_pos(ctx, x, dest_y);
 582            break;
 583        }
 584        case 'a':
 585        case 'C':
 586            if (x + ctx->esc_values[0] > ctx->cols - 1)
 587                ctx->esc_values[0] = (ctx->cols - 1) - x;
 588            ctx->set_cursor_pos(ctx, x + ctx->esc_values[0], y);
 589            break;
 590        case 'D':
 591            if (ctx->esc_values[0] > x)
 592                ctx->esc_values[0] = x;
 593            ctx->set_cursor_pos(ctx, x - ctx->esc_values[0], y);
 594            break;
 595        case 'c':
 596            if (ctx->callback != NULL) {
 597                ctx->callback(ctx, FLANTERM_CB_PRIVATE_ID, 0, 0, 0);
 598            }
 599            break;
 600        case 'd':
 601            ctx->esc_values[0] -= 1;
 602            if (ctx->esc_values[0] >= ctx->rows)
 603                ctx->esc_values[0] = ctx->rows - 1;
 604            ctx->set_cursor_pos(ctx, x, ctx->esc_values[0]);
 605            break;
 606        case 'G':
 607        case '`':
 608            ctx->esc_values[0] -= 1;
 609            if (ctx->esc_values[0] >= ctx->cols)
 610                ctx->esc_values[0] = ctx->cols - 1;
 611            ctx->set_cursor_pos(ctx, ctx->esc_values[0], y);
 612            break;
 613        case 'H':
 614        case 'f':
 615            if (ctx->esc_values[0] != 0) {
 616                ctx->esc_values[0]--;
 617            }
 618            if (ctx->esc_values[1] != 0) {
 619                ctx->esc_values[1]--;
 620            }
 621            if (ctx->esc_values[1] >= ctx->cols)
 622                ctx->esc_values[1] = ctx->cols - 1;
 623            if (ctx->esc_values[0] >= ctx->rows)
 624                ctx->esc_values[0] = ctx->rows - 1;
 625            ctx->set_cursor_pos(ctx, ctx->esc_values[1], ctx->esc_values[0]);
 626            break;
 627        case 'M': {
 628            size_t count = ctx->esc_values[0] > ctx->rows ? ctx->rows : ctx->esc_values[0];
 629            for (size_t i = 0; i < count; i++) {
 630                ctx->scroll(ctx);
 631            }
 632            break;
 633        }
 634        case 'L': {
 635            size_t old_scroll_top_margin = ctx->scroll_top_margin;
 636            ctx->scroll_top_margin = y;
 637            size_t count = ctx->esc_values[0] > ctx->rows ? ctx->rows : ctx->esc_values[0];
 638            for (size_t i = 0; i < count; i++) {
 639                ctx->revscroll(ctx);
 640            }
 641            ctx->scroll_top_margin = old_scroll_top_margin;
 642            break;
 643        }
 644        case 'n':
 645            switch (ctx->esc_values[0]) {
 646                case 5:
 647                    if (ctx->callback != NULL) {
 648                        ctx->callback(ctx, FLANTERM_CB_STATUS_REPORT, 0, 0, 0);
 649                    }
 650                    break;
 651                case 6:
 652                    if (ctx->callback != NULL) {
 653                        ctx->callback(ctx, FLANTERM_CB_POS_REPORT, x + 1, y + 1, 0);
 654                    }
 655                    break;
 656            }
 657            break;
 658        case 'q':
 659            if (ctx->callback != NULL) {
 660                ctx->callback(ctx, FLANTERM_CB_KBD_LEDS, ctx->esc_values[0], 0, 0);
 661            }
 662            break;
 663        case 'J':
 664            switch (ctx->esc_values[0]) {
 665                case 0: {
 666                    size_t rows_remaining = ctx->rows - (y + 1);
 667                    size_t cols_diff = ctx->cols - (x + 1);
 668                    size_t to_clear = rows_remaining * ctx->cols + cols_diff + 1;
 669                    for (size_t i = 0; i < to_clear; i++) {
 670                        ctx->raw_putchar(ctx, ' ');
 671                    }
 672                    ctx->set_cursor_pos(ctx, x, y);
 673                    break;
 674                }
 675                case 1: {
 676                    ctx->set_cursor_pos(ctx, 0, 0);
 677                    bool b = false;
 678                    for (size_t yc = 0; yc < ctx->rows; yc++) {
 679                        for (size_t xc = 0; xc < ctx->cols; xc++) {
 680                            ctx->raw_putchar(ctx, ' ');
 681                            if (xc == x && yc == y) {
 682                                ctx->set_cursor_pos(ctx, x, y);
 683                                b = true;
 684                                break;
 685                            }
 686                        }
 687                        if (b == true)
 688                            break;
 689                    }
 690                    break;
 691                }
 692                case 2:
 693                case 3:
 694                    ctx->clear(ctx, false);
 695                    break;
 696            }
 697            break;
 698        case '@':
 699            for (size_t i = ctx->cols - 1; ; i--) {
 700                ctx->move_character(ctx, i + ctx->esc_values[0], y, i, y);
 701                ctx->set_cursor_pos(ctx, i, y);
 702                ctx->raw_putchar(ctx, ' ');
 703                if (i == x) {
 704                    break;
 705                }
 706            }
 707            ctx->set_cursor_pos(ctx, x, y);
 708            break;
 709        case 'P':
 710            for (size_t i = x + ctx->esc_values[0]; i < ctx->cols; i++)
 711                ctx->move_character(ctx, i - ctx->esc_values[0], y, i, y);
 712            ctx->set_cursor_pos(ctx, ctx->cols - ctx->esc_values[0], y);
 713            // FALLTHRU
 714        case 'X': {
 715            size_t count = ctx->esc_values[0] > ctx->cols ? ctx->cols : ctx->esc_values[0];
 716            for (size_t i = 0; i < count; i++)
 717                ctx->raw_putchar(ctx, ' ');
 718            ctx->set_cursor_pos(ctx, x, y);
 719            break;
 720        }
 721        case 'm':
 722            sgr(ctx);
 723            break;
 724        case 's':
 725            ctx->get_cursor_pos(ctx, &ctx->saved_cursor_x, &ctx->saved_cursor_y);
 726            break;
 727        case 'u':
 728            ctx->set_cursor_pos(ctx, ctx->saved_cursor_x, ctx->saved_cursor_y);
 729            break;
 730        case 'K':
 731            switch (ctx->esc_values[0]) {
 732                case 0: {
 733                    for (size_t i = x; i < ctx->cols; i++)
 734                        ctx->raw_putchar(ctx, ' ');
 735                    ctx->set_cursor_pos(ctx, x, y);
 736                    break;
 737                }
 738                case 1: {
 739                    ctx->set_cursor_pos(ctx, 0, y);
 740                    for (size_t i = 0; i < x; i++)
 741                        ctx->raw_putchar(ctx, ' ');
 742                    break;
 743                }
 744                case 2: {
 745                    ctx->set_cursor_pos(ctx, 0, y);
 746                    for (size_t i = 0; i < ctx->cols; i++)
 747                        ctx->raw_putchar(ctx, ' ');
 748                    ctx->set_cursor_pos(ctx, x, y);
 749                    break;
 750                }
 751            }
 752            break;
 753        case 'r':
 754            if (ctx->esc_values[0] == 0) {
 755                ctx->esc_values[0] = 1;
 756            }
 757            if (ctx->esc_values[1] == 0) {
 758                ctx->esc_values[1] = 1;
 759            }
 760            ctx->scroll_top_margin = 0;
 761            ctx->scroll_bottom_margin = ctx->rows;
 762            if (ctx->esc_values_i > 0) {
 763                ctx->scroll_top_margin = ctx->esc_values[0] - 1;
 764            }
 765            if (ctx->esc_values_i > 1) {
 766                ctx->scroll_bottom_margin = ctx->esc_values[1];
 767            }
 768            if (ctx->scroll_top_margin >= ctx->rows
 769             || ctx->scroll_bottom_margin > ctx->rows
 770             || ctx->scroll_top_margin >= (ctx->scroll_bottom_margin - 1)) {
 771                ctx->scroll_top_margin = 0;
 772                ctx->scroll_bottom_margin = ctx->rows;
 773            }
 774            ctx->set_cursor_pos(ctx, 0, 0);
 775            break;
 776        case 'l':
 777        case 'h':
 778            mode_toggle(ctx, c);
 779            break;
 780        case ']':
 781            linux_private_parse(ctx);
 782            break;
 783    }
 784
 785    ctx->scroll_enabled = r;
 786
 787cleanup:
 788    ctx->control_sequence = false;
 789    ctx->escape = false;
 790}
 791
 792static void restore_state(struct flanterm_context *ctx) {
 793    ctx->bold = ctx->saved_state_bold;
 794    ctx->bg_bold = ctx->saved_state_bg_bold;
 795    ctx->reverse_video = ctx->saved_state_reverse_video;
 796    ctx->current_charset = ctx->saved_state_current_charset;
 797    ctx->current_primary = ctx->saved_state_current_primary;
 798    ctx->current_bg = ctx->saved_state_current_bg;
 799
 800    ctx->restore_state(ctx);
 801}
 802
 803static void save_state(struct flanterm_context *ctx) {
 804    ctx->save_state(ctx);
 805
 806    ctx->saved_state_bold = ctx->bold;
 807    ctx->saved_state_bg_bold = ctx->bg_bold;
 808    ctx->saved_state_reverse_video = ctx->reverse_video;
 809    ctx->saved_state_current_charset = ctx->current_charset;
 810    ctx->saved_state_current_primary = ctx->current_primary;
 811    ctx->saved_state_current_bg = ctx->current_bg;
 812}
 813
 814static void escape_parse(struct flanterm_context *ctx, uint8_t c) {
 815    ctx->escape_offset++;
 816
 817    if (ctx->osc == true) {
 818        osc_parse(ctx, c);
 819        return;
 820    }
 821
 822    if (ctx->control_sequence == true) {
 823        control_sequence_parse(ctx, c);
 824        return;
 825    }
 826
 827    size_t x, y;
 828    ctx->get_cursor_pos(ctx, &x, &y);
 829
 830    switch (c) {
 831        case ']':
 832            ctx->osc_escape = false;
 833            ctx->osc = true;
 834            return;
 835        case '[':
 836            for (size_t i = 0; i < FLANTERM_MAX_ESC_VALUES; i++)
 837                ctx->esc_values[i] = 0;
 838            ctx->esc_values_i = 0;
 839            ctx->rrr = false;
 840            ctx->control_sequence = true;
 841            return;
 842        case '7':
 843            save_state(ctx);
 844            break;
 845        case '8':
 846            restore_state(ctx);
 847            break;
 848        case 'c':
 849            flanterm_context_reinit(ctx);
 850            ctx->clear(ctx, true);
 851            break;
 852        case 'D':
 853            if (y == ctx->scroll_bottom_margin - 1) {
 854                ctx->scroll(ctx);
 855                ctx->set_cursor_pos(ctx, x, y);
 856            } else {
 857                ctx->set_cursor_pos(ctx, x, y + 1);
 858            }
 859            break;
 860        case 'E':
 861            if (y == ctx->scroll_bottom_margin - 1) {
 862                ctx->scroll(ctx);
 863                ctx->set_cursor_pos(ctx, 0, y);
 864            } else {
 865                ctx->set_cursor_pos(ctx, 0, y + 1);
 866            }
 867            break;
 868        case 'M':
 869            // "Reverse linefeed"
 870            if (y == ctx->scroll_top_margin) {
 871                ctx->revscroll(ctx);
 872                ctx->set_cursor_pos(ctx, 0, y);
 873            } else {
 874                ctx->set_cursor_pos(ctx, 0, y - 1);
 875            }
 876            break;
 877        case 'Z':
 878            if (ctx->callback != NULL) {
 879                ctx->callback(ctx, FLANTERM_CB_PRIVATE_ID, 0, 0, 0);
 880            }
 881            break;
 882        case '(':
 883        case ')':
 884            ctx->g_select = c - '\'';
 885            break;
 886    }
 887
 888    ctx->escape = false;
 889}
 890
 891static bool dec_special_print(struct flanterm_context *ctx, uint8_t c) {
 892#define FLANTERM_DEC_SPCL_PRN(C) ctx->raw_putchar(ctx, (C)); return true;
 893    switch (c) {
 894        case '`': FLANTERM_DEC_SPCL_PRN(0x04)
 895        case '0': FLANTERM_DEC_SPCL_PRN(0xdb)
 896        case '-': FLANTERM_DEC_SPCL_PRN(0x18)
 897        case ',': FLANTERM_DEC_SPCL_PRN(0x1b)
 898        case '.': FLANTERM_DEC_SPCL_PRN(0x19)
 899        case 'a': FLANTERM_DEC_SPCL_PRN(0xb1)
 900        case 'f': FLANTERM_DEC_SPCL_PRN(0xf8)
 901        case 'g': FLANTERM_DEC_SPCL_PRN(0xf1)
 902        case 'h': FLANTERM_DEC_SPCL_PRN(0xb0)
 903        case 'j': FLANTERM_DEC_SPCL_PRN(0xd9)
 904        case 'k': FLANTERM_DEC_SPCL_PRN(0xbf)
 905        case 'l': FLANTERM_DEC_SPCL_PRN(0xda)
 906        case 'm': FLANTERM_DEC_SPCL_PRN(0xc0)
 907        case 'n': FLANTERM_DEC_SPCL_PRN(0xc5)
 908        case 'q': FLANTERM_DEC_SPCL_PRN(0xc4)
 909        case 's': FLANTERM_DEC_SPCL_PRN(0x5f)
 910        case 't': FLANTERM_DEC_SPCL_PRN(0xc3)
 911        case 'u': FLANTERM_DEC_SPCL_PRN(0xb4)
 912        case 'v': FLANTERM_DEC_SPCL_PRN(0xc1)
 913        case 'w': FLANTERM_DEC_SPCL_PRN(0xc2)
 914        case 'x': FLANTERM_DEC_SPCL_PRN(0xb3)
 915        case 'y': FLANTERM_DEC_SPCL_PRN(0xf3)
 916        case 'z': FLANTERM_DEC_SPCL_PRN(0xf2)
 917        case '~': FLANTERM_DEC_SPCL_PRN(0xfa)
 918        case '_': FLANTERM_DEC_SPCL_PRN(0xff)
 919        case '+': FLANTERM_DEC_SPCL_PRN(0x1a)
 920        case '{': FLANTERM_DEC_SPCL_PRN(0xe3)
 921        case '}': FLANTERM_DEC_SPCL_PRN(0x9c)
 922    }
 923#undef FLANTERM_DEC_SPCL_PRN
 924
 925    return false;
 926}
 927
 928// Following wcwidth related code inherited from:
 929// https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
 930
 931struct interval {
 932    uint32_t first;
 933    uint32_t last;
 934};
 935
 936/* auxiliary function for binary search in interval table */
 937static int bisearch(uint32_t ucs, const struct interval *table, int max) {
 938  int min = 0;
 939  int mid;
 940
 941  if (ucs < table[0].first || ucs > table[max].last)
 942    return 0;
 943  while (max >= min) {
 944    mid = (min + max) / 2;
 945    if (ucs > table[mid].last)
 946      min = mid + 1;
 947    else if (ucs < table[mid].first)
 948      max = mid - 1;
 949    else
 950      return 1;
 951  }
 952
 953  return 0;
 954}
 955
 956int mk_wcwidth(uint32_t ucs) {
 957  /* sorted list of non-overlapping intervals of non-spacing characters */
 958  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
 959  static const struct interval combining[] = {
 960    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
 961    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
 962    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
 963    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
 964    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
 965    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
 966    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
 967    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
 968    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
 969    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
 970    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
 971    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
 972    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
 973    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
 974    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
 975    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
 976    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
 977    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
 978    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
 979    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
 980    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
 981    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
 982    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
 983    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
 984    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
 985    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
 986    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
 987    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
 988    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
 989    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
 990    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
 991    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
 992    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
 993    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
 994    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
 995    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
 996    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
 997    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
 998    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
 999    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
1000    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
1001    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
1002    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
1003    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
1004    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
1005    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
1006    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
1007    { 0xE0100, 0xE01EF }
1008  };
1009
1010  /* test for 8-bit control characters */
1011  if (ucs == 0)
1012    return 0;
1013  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
1014    return 1;
1015
1016  /* binary search in table of non-spacing characters */
1017  if (bisearch(ucs, combining,
1018	       sizeof(combining) / sizeof(struct interval) - 1))
1019    return 0;
1020
1021  /* if we arrive here, ucs is not a combining or C0/C1 control character */
1022
1023  return 1 +
1024    (ucs >= 0x1100 &&
1025     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
1026      ucs == 0x2329 || ucs == 0x232a ||
1027      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
1028       ucs != 0x303f) ||                  /* CJK ... Yi */
1029      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
1030      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
1031      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
1032      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
1033      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
1034      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
1035      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
1036      (ucs >= 0x30000 && ucs <= 0x3fffd)));
1037}
1038
1039// End of https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c inherited code
1040
1041static int unicode_to_cp437(uint64_t code_point) {
1042    switch (code_point) {
1043        case 0x263a: return 1;
1044        case 0x263b: return 2;
1045        case 0x2665: return 3;
1046        case 0x2666: return 4;
1047        case 0x2663: return 5;
1048        case 0x2660: return 6;
1049        case 0x2022: return 7;
1050        case 0x25d8: return 8;
1051        case 0x25cb: return 9;
1052        case 0x25d9: return 10;
1053        case 0x2642: return 11;
1054        case 0x2640: return 12;
1055        case 0x266a: return 13;
1056        case 0x266b: return 14;
1057        case 0x263c: return 15;
1058        case 0x25ba: return 16;
1059        case 0x25c4: return 17;
1060        case 0x2195: return 18;
1061        case 0x203c: return 19;
1062        case 0x00b6: return 20;
1063        case 0x00a7: return 21;
1064        case 0x25ac: return 22;
1065        case 0x21a8: return 23;
1066        case 0x2191: return 24;
1067        case 0x2193: return 25;
1068        case 0x2192: return 26;
1069        case 0x2190: return 27;
1070        case 0x221f: return 28;
1071        case 0x2194: return 29;
1072        case 0x25b2: return 30;
1073        case 0x25bc: return 31;
1074
1075        case 0x2302: return 127;
1076        case 0x00c7: return 128;
1077        case 0x00fc: return 129;
1078        case 0x00e9: return 130;
1079        case 0x00e2: return 131;
1080        case 0x00e4: return 132;
1081        case 0x00e0: return 133;
1082        case 0x00e5: return 134;
1083        case 0x00e7: return 135;
1084        case 0x00ea: return 136;
1085        case 0x00eb: return 137;
1086        case 0x00e8: return 138;
1087        case 0x00ef: return 139;
1088        case 0x00ee: return 140;
1089        case 0x00ec: return 141;
1090        case 0x00c4: return 142;
1091        case 0x00c5: return 143;
1092        case 0x00c9: return 144;
1093        case 0x00e6: return 145;
1094        case 0x00c6: return 146;
1095        case 0x00f4: return 147;
1096        case 0x00f6: return 148;
1097        case 0x00f2: return 149;
1098        case 0x00fb: return 150;
1099        case 0x00f9: return 151;
1100        case 0x00ff: return 152;
1101        case 0x00d6: return 153;
1102        case 0x00dc: return 154;
1103        case 0x00a2: return 155;
1104        case 0x00a3: return 156;
1105        case 0x00a5: return 157;
1106        case 0x20a7: return 158;
1107        case 0x0192: return 159;
1108        case 0x00e1: return 160;
1109        case 0x00ed: return 161;
1110        case 0x00f3: return 162;
1111        case 0x00fa: return 163;
1112        case 0x00f1: return 164;
1113        case 0x00d1: return 165;
1114        case 0x00aa: return 166;
1115        case 0x00ba: return 167;
1116        case 0x00bf: return 168;
1117        case 0x2310: return 169;
1118        case 0x00ac: return 170;
1119        case 0x00bd: return 171;
1120        case 0x00bc: return 172;
1121        case 0x00a1: return 173;
1122        case 0x00ab: return 174;
1123        case 0x00bb: return 175;
1124        case 0x2591: return 176;
1125        case 0x2592: return 177;
1126        case 0x2593: return 178;
1127        case 0x2502: return 179;
1128        case 0x2524: return 180;
1129        case 0x2561: return 181;
1130        case 0x2562: return 182;
1131        case 0x2556: return 183;
1132        case 0x2555: return 184;
1133        case 0x2563: return 185;
1134        case 0x2551: return 186;
1135        case 0x2557: return 187;
1136        case 0x255d: return 188;
1137        case 0x255c: return 189;
1138        case 0x255b: return 190;
1139        case 0x2510: return 191;
1140        case 0x2514: return 192;
1141        case 0x2534: return 193;
1142        case 0x252c: return 194;
1143        case 0x251c: return 195;
1144        case 0x2500: return 196;
1145        case 0x253c: return 197;
1146        case 0x255e: return 198;
1147        case 0x255f: return 199;
1148        case 0x255a: return 200;
1149        case 0x2554: return 201;
1150        case 0x2569: return 202;
1151        case 0x2566: return 203;
1152        case 0x2560: return 204;
1153        case 0x2550: return 205;
1154        case 0x256c: return 206;
1155        case 0x2567: return 207;
1156        case 0x2568: return 208;
1157        case 0x2564: return 209;
1158        case 0x2565: return 210;
1159        case 0x2559: return 211;
1160        case 0x2558: return 212;
1161        case 0x2552: return 213;
1162        case 0x2553: return 214;
1163        case 0x256b: return 215;
1164        case 0x256a: return 216;
1165        case 0x2518: return 217;
1166        case 0x250c: return 218;
1167        case 0x2588: return 219;
1168        case 0x2584: return 220;
1169        case 0x258c: return 221;
1170        case 0x2590: return 222;
1171        case 0x2580: return 223;
1172        case 0x03b1: return 224;
1173        case 0x00df: return 225;
1174        case 0x0393: return 226;
1175        case 0x03c0: return 227;
1176        case 0x03a3: return 228;
1177        case 0x03c3: return 229;
1178        case 0x00b5: return 230;
1179        case 0x03c4: return 231;
1180        case 0x03a6: return 232;
1181        case 0x0398: return 233;
1182        case 0x03a9: return 234;
1183        case 0x03b4: return 235;
1184        case 0x221e: return 236;
1185        case 0x03c6: return 237;
1186        case 0x03b5: return 238;
1187        case 0x2229: return 239;
1188        case 0x2261: return 240;
1189        case 0x00b1: return 241;
1190        case 0x2265: return 242;
1191        case 0x2264: return 243;
1192        case 0x2320: return 244;
1193        case 0x2321: return 245;
1194        case 0x00f7: return 246;
1195        case 0x2248: return 247;
1196        case 0x00b0: return 248;
1197        case 0x2219: return 249;
1198        case 0x00b7: return 250;
1199        case 0x221a: return 251;
1200        case 0x207f: return 252;
1201        case 0x00b2: return 253;
1202        case 0x25a0: return 254;
1203    }
1204
1205    return -1;
1206}
1207
1208static void flanterm_putchar(struct flanterm_context *ctx, uint8_t c) {
1209    if (ctx->discard_next || (c == 0x18 || c == 0x1a)) {
1210        ctx->discard_next = false;
1211        ctx->escape = false;
1212        ctx->control_sequence = false;
1213        ctx->unicode_remaining = 0;
1214        ctx->osc = false;
1215        ctx->osc_escape = false;
1216        ctx->g_select = 0;
1217        return;
1218    }
1219
1220    if (ctx->unicode_remaining != 0) {
1221        if ((c & 0xc0) != 0x80) {
1222            ctx->unicode_remaining = 0;
1223            goto unicode_error;
1224        }
1225
1226        ctx->unicode_remaining--;
1227        ctx->code_point |= (uint64_t)(c & 0x3f) << (6 * ctx->unicode_remaining);
1228        if (ctx->unicode_remaining != 0) {
1229            return;
1230        }
1231
1232        int cc = unicode_to_cp437(ctx->code_point);
1233
1234        if (cc == -1) {
1235            size_t replacement_width = (size_t)mk_wcwidth(ctx->code_point);
1236            if (replacement_width > 0) {
1237                ctx->raw_putchar(ctx, 0xfe);
1238            }
1239            for (size_t i = 1; i < replacement_width; i++) {
1240                ctx->raw_putchar(ctx, ' ');
1241            }
1242        } else {
1243            ctx->raw_putchar(ctx, cc);
1244        }
1245        return;
1246    }
1247
1248unicode_error:
1249    if (c >= 0xc0 && c <= 0xf7) {
1250        if (c >= 0xc0 && c <= 0xdf) {
1251            ctx->unicode_remaining = 1;
1252            ctx->code_point = (uint64_t)(c & 0x1f) << 6;
1253        } else if (c >= 0xe0 && c <= 0xef) {
1254            ctx->unicode_remaining = 2;
1255            ctx->code_point = (uint64_t)(c & 0x0f) << (6 * 2);
1256        } else if (c >= 0xf0 && c <= 0xf7) {
1257            ctx->unicode_remaining = 3;
1258            ctx->code_point = (uint64_t)(c & 0x07) << (6 * 3);
1259        }
1260        return;
1261    }
1262
1263    if (ctx->escape == true) {
1264        escape_parse(ctx, c);
1265        return;
1266    }
1267
1268    if (ctx->g_select) {
1269        ctx->g_select--;
1270        switch (c) {
1271            case 'B':
1272                ctx->charsets[ctx->g_select] = CHARSET_DEFAULT; break;
1273            case '0':
1274                ctx->charsets[ctx->g_select] = CHARSET_DEC_SPECIAL; break;
1275        }
1276        ctx->g_select = 0;
1277        return;
1278    }
1279
1280    size_t x, y;
1281    ctx->get_cursor_pos(ctx, &x, &y);
1282
1283    switch (c) {
1284        case 0x00:
1285        case 0x7f:
1286            return;
1287        case 0x1b:
1288            ctx->escape_offset = 0;
1289            ctx->escape = true;
1290            return;
1291        case '\t':
1292            if ((x / ctx->tab_size + 1) >= ctx->cols) {
1293                ctx->set_cursor_pos(ctx, ctx->cols - 1, y);
1294                return;
1295            }
1296            ctx->set_cursor_pos(ctx, (x / ctx->tab_size + 1) * ctx->tab_size, y);
1297            return;
1298        case 0x0b:
1299        case 0x0c:
1300        case '\n':
1301            if (y == ctx->scroll_bottom_margin - 1) {
1302                ctx->scroll(ctx);
1303                ctx->set_cursor_pos(ctx, (ctx->oob_output & FLANTERM_OOB_OUTPUT_ONLCR) ? 0 : x, y);
1304            } else {
1305                ctx->set_cursor_pos(ctx, (ctx->oob_output & FLANTERM_OOB_OUTPUT_ONLCR) ? 0 : x, y + 1);
1306            }
1307            return;
1308        case '\b':
1309            ctx->set_cursor_pos(ctx, x - 1, y);
1310            return;
1311        case '\r':
1312            ctx->set_cursor_pos(ctx, 0, y);
1313            return;
1314        case '\a':
1315            // The bell is handled by the kernel
1316            if (ctx->callback != NULL) {
1317                ctx->callback(ctx, FLANTERM_CB_BELL, 0, 0, 0);
1318            }
1319            return;
1320        case 14:
1321            // Move to G1 set
1322            ctx->current_charset = 1;
1323            return;
1324        case 15:
1325            // Move to G0 set
1326            ctx->current_charset = 0;
1327            return;
1328    }
1329
1330    if (ctx->insert_mode == true) {
1331        for (size_t i = ctx->cols - 1; ; i--) {
1332            ctx->move_character(ctx, i + 1, y, i, y);
1333            if (i == x) {
1334                break;
1335            }
1336        }
1337    }
1338
1339    // Translate character set
1340    switch (ctx->charsets[ctx->current_charset]) {
1341        case CHARSET_DEFAULT:
1342            break;
1343        case CHARSET_DEC_SPECIAL:
1344            if (dec_special_print(ctx, c)) {
1345                return;
1346            }
1347            break;
1348    }
1349
1350    if (c >= 0x20 && c <= 0x7e) {
1351        ctx->raw_putchar(ctx, c);
1352    } else {
1353        ctx->raw_putchar(ctx, 0xfe);
1354    }
1355}
1356
1357void flanterm_flush(struct flanterm_context *ctx) {
1358    ctx->double_buffer_flush(ctx);
1359}
1360
1361void flanterm_full_refresh(struct flanterm_context *ctx) {
1362    ctx->full_refresh(ctx);
1363}
1364
1365void flanterm_deinit(struct flanterm_context *ctx, void (*_free)(void *, size_t)) {
1366    ctx->deinit(ctx, _free);
1367}
1368
1369void flanterm_get_dimensions(struct flanterm_context *ctx, size_t *cols, size_t *rows) {
1370    *cols = ctx->cols;
1371    *rows = ctx->rows;
1372}
1373
1374void flanterm_set_autoflush(struct flanterm_context *ctx, bool state) {
1375    ctx->autoflush = state;
1376}
1377
1378void flanterm_set_callback(struct flanterm_context *ctx, void (*callback)(struct flanterm_context *, uint64_t, uint64_t, uint64_t, uint64_t)) {
1379    ctx->callback = callback;
1380}
1381
1382uint64_t flanterm_get_oob_output(struct flanterm_context *ctx) {
1383    return ctx->oob_output;
1384}
1385
1386void flanterm_set_oob_output(struct flanterm_context *ctx, uint64_t oob_output) {
1387    ctx->oob_output = oob_output;
1388}