term.c

   1 #include <ctype.h>
   2 #include <errno.h>
   3 #include <fcntl.h>
   4 #include <poll.h>
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <sys/types.h>
   9 #include <sys/ioctl.h>
  10 #include <termios.h>
  11 #include <unistd.h>
  12 #include "conf.h"
  13 #include "fbpad.h"
  14
  15 #define MODE_CURSOR             0x01
  16 #define MODE_WRAP               0x02
  17 #define MODE_ORIGIN             0x04
  18 #define MODE_AUTOCR             0x08
  19 #define ATTR_BOLD               0x10
  20 #define ATTR_ITALIC             0x20
  21 #define ATTR_REV                0x40
  22 #define ATTR_ALL                (ATTR_BOLD | ATTR_ITALIC | ATTR_REV)
  23 #define MODE_INSERT             0x100
  24 #define MODE_WRAPREADY          0x200
  25 #define MODE_CLR8               0x400   /* colours 0-7 */
  26
  27 #define LIMIT(n, a, b)          ((n) < (a) ? (a) : ((n) > (b) ? (b) : (n)))
  28 #define BIT_SET(i, b, val)      ((val) ? ((i) | (b)) : ((i) & ~(b)))
  29 #define OFFSET(r, c)            ((r) * pad_cols() + (c))
  30
  31 static struct term *term;
  32 static int *screen;
  33 static int *fgs, *bgs;
  34 static int *dirty;
  35 static int lazy;
  36 static int row, col;
  37 static int fg, bg;
  38 static int top, bot;
  39 static int mode;
  40 static int visible;
  41
  42 static unsigned int clr16[16] = {
  43         COLOR0, COLOR1, COLOR2, COLOR3, COLOR4, COLOR5, COLOR6, COLOR7,
  44         COLOR8, COLOR9, COLORA, COLORB, COLORC, COLORD, COLORE, COLORF,
  45 };
  46
  47 static int clrmap(int c)
  48 {
  49         int g = (c - 232) * 10 + 8;
  50         if (c < 16) {
  51                 return clr16[c];
  52         }
  53         if (c < 232) {
  54                 int ri = (c - 16) / 36 ;
  55                 int gi = (c - 16) % 36 / 6;
  56                 int bi = (c - 16) % 6;
  57                 int rc = ri ? (ri * 40 + 55) : 0;
  58                 int gc = gi ? (gi * 40 + 55) : 0;
  59                 int bc = bi ? (bi * 40 + 55) : 0;
  60                 return (rc << 16) | (gc << 8) | bc;
  61         }
  62         return (g << 16) | (g << 8) | g;
  63 }
  64
  65 /* low level drawing and lazy updating */
  66
  67 static int fgcolor(void)
  68 {
  69         int c = mode & ATTR_REV ? bg : fg;
  70         if (mode & ATTR_BOLD)
  71                 c |= FN_B;
  72         if (mode & ATTR_ITALIC)
  73                 c |= FN_I;
  74         return c;
  75 }
  76
  77 static int bgcolor(void)
  78 {
  79         return mode & ATTR_REV ? fg : bg;
  80 }
  81
  82 /* assumes visible && !lazy */
  83 static void _draw_pos(int r, int c, int cursor)
  84 {
  85         int rev = cursor && mode & MODE_CURSOR;
  86         int i = OFFSET(r, c);
  87         int fg = rev ? bgs[i] : fgs[i];
  88         int bg = rev ? fgs[i] : bgs[i];
  89         pad_put(screen[i], r, c, fg, bg);
  90 }
  91
  92 /* assumes visible && !lazy */
  93 static void _draw_row(int r)
  94 {
  95         int cbg, cch;           /* current background and character */
  96         int fbg, fsc = -1;      /* filling background and start column */
  97         int i;
  98         /* call pad_fill() only once for blank columns with identical backgrounds */
  99         for (i = 0; i < pad_cols(); i++) {
 100                 cbg = bgs[OFFSET(r, i)];
 101                 cch = screen[OFFSET(r, i)] ? screen[OFFSET(r, i)] : ' ';
 102                 if (fsc >= 0 && (cbg != fbg || cch != ' ')) {
 103                         pad_fill(r, r + 1, fsc, i, fbg & FN_C);
 104                         fsc = -1;
 105                 }
 106                 if (cch != ' ') {
 107                         _draw_pos(r, i, 0);
 108                 } else if (fsc < 0) {
 109                         fsc = i;
 110                         fbg = cbg;
 111                 }
 112         }
 113         pad_fill(r, r + 1, fsc >= 0 ? fsc : pad_cols(), -1, cbg & FN_C);
 114 }
 115
 116 static int candraw(int sr, int er)
 117 {
 118         int i;
 119         if (lazy)
 120                 for (i = sr; i < er; i++)
 121                         dirty[i] = 1;
 122         return visible && !lazy;
 123 }
 124
 125 static void draw_rows(int sr, int er)
 126 {
 127         int i;
 128         if (candraw(sr, er))
 129                 for (i = sr; i < er; i++)
 130                         _draw_row(i);
 131 }
 132
 133 static void draw_cols(int r, int sc, int ec)
 134 {
 135         int i;
 136         if (candraw(r, r + 1))
 137                 for (i = sc; i < ec; i++)
 138                         _draw_pos(r, i, 0);
 139 }
 140
 141 static void draw_char(int ch, int r, int c)
 142 {
 143         int i = OFFSET(r, c);
 144         screen[i] = ch;
 145         fgs[i] = fgcolor();
 146         bgs[i] = bgcolor();
 147         if (candraw(r, r + 1))
 148                 _draw_pos(r, c, 0);
 149 }
 150
 151 static void draw_cursor(int put)
 152 {
 153         if (candraw(row, row + 1))
 154                 _draw_pos(row, col, put);
 155 }
 156
 157 static void lazy_start(void)
 158 {
 159         memset(dirty, 0, pad_rows() * sizeof(*dirty));
 160         lazy = 1;
 161 }
 162
 163 static void lazy_flush(void)
 164 {
 165         int i;
 166         if (!visible || !lazy)
 167                 return;
 168         for (i = 0; i < pad_rows(); i++)
 169                 if (dirty[i])
 170                         _draw_row(i);
 171         if (dirty[row])
 172                 _draw_pos(row, col, 1);
 173         lazy = 0;
 174         term->hpos = 0;
 175 }
 176
 177 static void screen_reset(int i, int n)
 178 {
 179         int c;
 180         candraw(i / pad_cols(), (i + n) / pad_cols() + 1);
 181         memset(screen + i, 0, n * sizeof(*screen));
 182         for (c = 0; c < n; c++)
 183                 fgs[i + c] = fg;
 184         for (c = 0; c < n; c++)
 185                 bgs[i + c] = bg;
 186 }
 187
 188 static void screen_move(int dst, int src, int n)
 189 {
 190         int srow = (MIN(src, dst) + (n > 0 ? 0 : n)) / pad_cols();
 191         int drow = (MAX(src, dst) + (n > 0 ? n : 0)) / pad_cols() + 1;
 192         candraw(srow, drow);
 193         memmove(screen + dst, screen + src, n * sizeof(*screen));
 194         memmove(fgs + dst, fgs + src, n * sizeof(*fgs));
 195         memmove(bgs + dst, bgs + src, n * sizeof(*bgs));
 196 }
 197
 198 /* terminal input buffering */
 199
 200 #define PTYLEN                  (1 << 16)
 201
 202 static char ptybuf[PTYLEN];             /* always emptied in term_read() */
 203 static int ptylen;                      /* buffer length */
 204 static int ptycur;                      /* current offset */
 205
 206 static int waitpty(int us)
 207 {
 208         struct pollfd ufds[1];
 209         ufds[0].fd = term->fd;
 210         ufds[0].events = POLLIN;
 211         return poll(ufds, 1, us) <= 0;
 212 }
 213
 214 static int readpty(void)
 215 {
 216         int nr;
 217         if (ptycur < ptylen)
 218                 return (unsigned char) ptybuf[ptycur++];
 219         if (!term->fd)
 220                 return -1;
 221         ptylen = 0;
 222         while ((nr = read(term->fd, ptybuf + ptylen, PTYLEN - ptylen)) > 0)
 223                 ptylen += nr;
 224         if (!ptylen && errno == EAGAIN && !waitpty(100))
 225                 ptylen = read(term->fd, ptybuf, PTYLEN);
 226         ptycur = 1;
 227         return ptylen > 0 ? (unsigned char) ptybuf[0] : -1;
 228 }
 229
 230 /* term interface functions */
 231
 232 void term_send(int c)
 233 {
 234         char b = c;
 235         if (term->fd)
 236                 write(term->fd, &b, 1);
 237 }
 238
 239 static void term_sendstr(char *s)
 240 {
 241         if (term->fd)
 242                 write(term->fd, s, strlen(s));
 243 }
 244
 245 static void term_blank(void)
 246 {
 247         screen_reset(0, pad_rows() * pad_cols());
 248         if (visible)
 249                 pad_fill(0, -1, 0, -1, bgcolor() & FN_C);
 250 }
 251
 252 static void ctlseq(void);
 253 void term_read(void)
 254 {
 255         ctlseq();
 256         while (ptycur < ptylen) {
 257                 if (visible && !lazy && ptylen - ptycur > 15)
 258                         lazy_start();
 259                 ctlseq();
 260         }
 261         lazy_flush();
 262 }
 263
 264 static void term_reset(void)
 265 {
 266         row = col = 0;
 267         top = 0;
 268         bot = pad_rows();
 269         mode = MODE_CURSOR | MODE_WRAP | MODE_CLR8;
 270         fg = FGCOLOR;
 271         bg = BGCOLOR;
 272         term_blank();
 273 }
 274
 275 static int _openpty(int *master, int *slave)
 276 {
 277         int unlock = 0;
 278         int ptyno = 0;
 279         char name[20];
 280         if ((*master = open("/dev/ptmx", O_RDWR)) == -1)
 281                 return -1;
 282         if (ioctl(*master, TIOCSPTLCK, &unlock) == -1)
 283                 return -1;
 284         if (ioctl(*master, TIOCGPTN, &ptyno) == -1)
 285                 return -1;
 286         sprintf(name, "/dev/pts/%d", ptyno);
 287         *slave = open(name, O_RDWR | O_NOCTTY);
 288         return 0;
 289 }
 290
 291 static void _login(int fd)
 292 {
 293         struct winsize winp;
 294         winp.ws_col = pad_cols();
 295         winp.ws_row = pad_rows();
 296         winp.ws_xpixel = 0;
 297         winp.ws_ypixel = 0;
 298         setsid();
 299         ioctl(fd, TIOCSCTTY, NULL);
 300         ioctl(fd, TIOCSWINSZ, &winp);
 301         dup2(fd, 0);
 302         dup2(fd, 1);
 303         dup2(fd, 2);
 304         if (fd > 2)
 305                 close(fd);
 306 }
 307
 308 #define MAXENV          (1 << 8)
 309
 310 static void envcpy(char **d, char **s)
 311 {
 312         while (*s)
 313                 *d++ = *s++;
 314         *d = NULL;
 315 }
 316
 317 static void execvep(char *cmd, char **argv, char **envp)
 318 {
 319         char path[512];
 320         char *p = getenv("PATH");
 321         execve(cmd, argv, envp);
 322         while (*p) {
 323                 char *s = path;
 324                 while (*p && *p != ':')
 325                         *s++ = *p++;
 326                 *s++ = '/';
 327                 strcpy(s, cmd);
 328                 execve(path, argv, envp);
 329                 while (*p == ':')
 330                         p++;
 331         }
 332 }
 333
 334 extern char **environ;
 335 void term_exec(char **args)
 336 {
 337         int master, slave;
 338         memset(term, 0, sizeof(*term));
 339         if (_openpty(&master, &slave) == -1)
 340                 return;
 341         if ((term->pid = fork()) == -1)
 342                 return;
 343         if (!term->pid) {
 344                 char *envp[MAXENV] = {"TERM=linux"};
 345                 envcpy(envp + 1, environ);
 346                 _login(slave);
 347                 close(master);
 348                 execvep(args[0], args, envp);
 349                 exit(1);
 350         }
 351         close(slave);
 352         term->fd = master;
 353         fcntl(term->fd, F_SETFD, fcntl(term->fd, F_GETFD) | FD_CLOEXEC);
 354         fcntl(term->fd, F_SETFL, fcntl(term->fd, F_GETFL) | O_NONBLOCK);
 355         term_reset();
 356         memset(term->hist, 0, sizeof(term->hist));
 357 }
 358
 359 static void misc_save(struct term_state *state)
 360 {
 361         state->row = row;
 362         state->col = col;
 363         state->fg = fg;
 364         state->bg = bg;
 365         state->mode = mode;
 366 }
 367
 368 static void misc_load(struct term_state *state)
 369 {
 370         row = state->row;
 371         col = state->col;
 372         fg = state->fg;
 373         bg = state->bg;
 374         mode = state->mode;
 375 }
 376
 377 void term_save(struct term *term)
 378 {
 379         visible = 0;
 380         if (!lazy)
 381                 lazy_start();
 382         misc_save(&term->cur);
 383         term->top = top;
 384         term->bot = bot;
 385         term->lazy = lazy;
 386 }
 387
 388 /* redraw the screen; if all is zero, update changed lines only */
 389 void term_redraw(int all)
 390 {
 391         if (term->fd) {
 392                 if (all) {
 393                         pad_fill(pad_rows(), -1, 0, -1, BGCOLOR);
 394                         lazy_start();
 395                         memset(dirty, 1, pad_rows() * sizeof(*dirty));
 396                 }
 397                 if (all || !term->hpos)
 398                         lazy_flush();
 399         } else {
 400                 if (all)
 401                         pad_fill(0, -1, 0, -1, 0);
 402         }
 403 }
 404
 405 void term_load(struct term *t, int flags)
 406 {
 407         term = t;
 408         misc_load(&term->cur);
 409         screen = term->screen;
 410         fgs = term->fgs;
 411         bgs = term->bgs;
 412         visible = flags;
 413         top = term->top;
 414         bot = term->bot;
 415         lazy = term->lazy;
 416         dirty = term->dirty;
 417 }
 418
 419 void term_end(void)
 420 {
 421         if (term->fd)
 422                 close(term->fd);
 423         memset(term, 0, sizeof(*term));
 424         term_load(term, visible);
 425         if (visible)
 426                 term_redraw(1);
 427 }
 428
 429 static int writeutf8(char *dst, int c)
 430 {
 431         char *d = dst;
 432         int l;
 433         if (c > 0xffff) {
 434                 *d++ = 0xf0 | (c >> 18);
 435                 l = 3;
 436         } else if (c > 0x7ff) {
 437                 *d++ = 0xe0 | (c >> 12);
 438                 l = 2;
 439         } else if (c > 0x7f) {
 440                 *d++ = 0xc0 | (c >> 6);
 441                 l = 1;
 442         } else {
 443                 *d++ = c > 0 ? c : ' ';
 444                 l = 0;
 445         }
 446         while (l--)
 447                 *d++ = 0x80 | ((c >> (l * 6)) & 0x3f);
 448         return d - dst;
 449 }
 450
 451 void term_screenshot(void)
 452 {
 453         char buf[1 << 11];
 454         int fd = open(SCRSHOT, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 455         int i, j;
 456         for (i = 0; i < pad_rows(); i++) {
 457                 char *s = buf;
 458                 for (j = 0; j < pad_cols(); j++)
 459                         if (~screen[OFFSET(i, j)] & DWCHAR)
 460                                 s += writeutf8(s, screen[OFFSET(i, j)]);
 461                 *s++ = '\n';
 462                 write(fd, buf, s - buf);
 463         }
 464         close(fd);
 465 }
 466
 467 /* high-level drawing functions */
 468
 469 static void empty_rows(int sr, int er)
 470 {
 471         screen_reset(OFFSET(sr, 0), (er - sr) * pad_cols());
 472 }
 473
 474 static void blank_rows(int sr, int er)
 475 {
 476         empty_rows(sr, er);
 477         draw_rows(sr, er);
 478         draw_cursor(1);
 479 }
 480
 481 #define HISTROW(pos)    (term->hist + ((term->hrow + NHIST - (pos)) % NHIST) * pad_cols())
 482
 483 static void scrl_rows(int nr)
 484 {
 485         int i;
 486         for (i = 0; i < nr; i++) {
 487                 memcpy(HISTROW(0), screen + i * pad_cols(),
 488                                 pad_cols() * sizeof(screen[0]));
 489                 term->hrow = (term->hrow + 1) % NHIST;
 490         }
 491 }
 492
 493 void term_scrl(int scrl)
 494 {
 495         int i, j;
 496         int hpos = LIMIT(term->hpos + scrl, 0, NHIST);
 497         term->hpos = hpos;
 498         if (!hpos) {
 499                 lazy_flush();
 500                 return;
 501         }
 502         lazy_start();
 503         memset(dirty, 1, pad_rows() * sizeof(*dirty));
 504         for (i = 0; i < pad_rows(); i++) {
 505                 int off = (i - hpos) * pad_cols();
 506                 int *_scr = i < hpos ? HISTROW(hpos - i) : term->screen + off;
 507                 int *_fgs = i < hpos ? NULL : term->fgs + off;
 508                 int *_bgs = i < hpos ? NULL : term->bgs + off;
 509                 for (j = 0; j < pad_cols(); j++)
 510                         pad_put(_scr[j], i, j, _fgs ? _fgs[j] : BGCOLOR,
 511                                                 _bgs ? _bgs[j] : FGCOLOR);
 512         }
 513 }
 514
 515 static void scroll_screen(int sr, int nr, int n)
 516 {
 517         draw_cursor(0);
 518         if (sr + n == 0)
 519                 scrl_rows(sr);
 520         screen_move(OFFSET(sr + n, 0), OFFSET(sr, 0), nr * pad_cols());
 521         if (n > 0)
 522                 empty_rows(sr, sr + n);
 523         else
 524                 empty_rows(sr + nr + n, sr + nr);
 525         draw_rows(MIN(sr, sr + n), MAX(sr + nr, sr + nr + n));
 526         draw_cursor(1);
 527 }
 528
 529 static void insert_lines(int n)
 530 {
 531         int sr = MAX(top, row);
 532         int nr = bot - row - n;
 533         if (nr > 0)
 534                 scroll_screen(sr, nr, n);
 535 }
 536
 537 static void delete_lines(int n)
 538 {
 539         int r = MAX(top, row);
 540         int sr = r + n;
 541         int nr = bot - r - n;
 542         if (nr > 0)
 543                 scroll_screen(sr, nr, -n);
 544 }
 545
 546 static int origin(void)
 547 {
 548         return mode & MODE_ORIGIN;
 549 }
 550
 551 static void move_cursor(int r, int c)
 552 {
 553         int t, b;
 554         draw_cursor(0);
 555         t = origin() ? top : 0;
 556         b = origin() ? bot : pad_rows();
 557         row = LIMIT(r, t, b - 1);
 558         col = LIMIT(c, 0, pad_cols() - 1);
 559         draw_cursor(1);
 560         mode = BIT_SET(mode, MODE_WRAPREADY, 0);
 561 }
 562
 563 static void set_region(int t, int b)
 564 {
 565         top = LIMIT(t - 1, 0, pad_rows() - 1);
 566         bot = LIMIT(b ? b : pad_rows(), top + 1, pad_rows());
 567         if (origin())
 568                 move_cursor(top, 0);
 569 }
 570
 571 static void setattr(int m)
 572 {
 573         if (!m || (m / 10) == 3)
 574                 mode |= MODE_CLR8;
 575         switch (m) {
 576         case 0:
 577                 fg = FGCOLOR;
 578                 bg = BGCOLOR;
 579                 mode &= ~ATTR_ALL;
 580                 break;
 581         case 1:
 582                 mode |= ATTR_BOLD;
 583                 break;
 584         case 3:
 585                 mode |= ATTR_ITALIC;
 586                 break;
 587         case 7:
 588                 mode |= ATTR_REV;
 589                 break;
 590         case 22:
 591                 mode &= ~ATTR_BOLD;
 592                 break;
 593         case 23:
 594                 mode &= ~ATTR_ITALIC;
 595                 break;
 596         case 27:
 597                 mode &= ~ATTR_REV;
 598                 break;
 599         default:
 600                 if ((m / 10) == 3)
 601                         fg = m > 37 ? FGCOLOR : clrmap(m - 30);
 602                 if ((m / 10) == 4)
 603                         bg = m > 47 ? BGCOLOR : clrmap(m - 40);
 604                 if ((m / 10) == 9)
 605                         fg = clrmap(8 + m - 90);
 606                 if ((m / 10) == 10)
 607                         bg = clrmap(8 + m - 100);
 608         }
 609 }
 610
 611 static void kill_chars(int sc, int ec)
 612 {
 613         int i;
 614         for (i = sc; i < ec; i++)
 615                 draw_char(0, row, i);
 616         draw_cursor(1);
 617 }
 618
 619 static void move_chars(int sc, int nc, int n)
 620 {
 621         draw_cursor(0);
 622         screen_move(OFFSET(row, sc + n), OFFSET(row, sc), nc);
 623         if (n > 0)
 624                 screen_reset(OFFSET(row, sc), n);
 625         else
 626                 screen_reset(OFFSET(row, pad_cols() + n), -n);
 627         draw_cols(row, MIN(sc, sc + n), pad_cols());
 628         draw_cursor(1);
 629 }
 630
 631 static void delete_chars(int n)
 632 {
 633         int sc = col + n;
 634         int nc = pad_cols() - sc;
 635         move_chars(sc, nc, -n);
 636 }
 637
 638 static void insert_chars(int n)
 639 {
 640         int nc = pad_cols() - col - n;
 641         move_chars(col, nc, n);
 642 }
 643
 644 static void advance(int dr, int dc, int scrl)
 645 {
 646         int r = row + dr;
 647         int c = col + dc;
 648         if (dr && r >= bot && scrl) {
 649                 int n = bot - r - 1;
 650                 int nr = (bot - top) + n;
 651                 scroll_screen(top + -n, nr, n);
 652         }
 653         if (dr && r < top && scrl) {
 654                 int n = top - r;
 655                 int nr = (bot - top) - n;
 656                 scroll_screen(top, nr, n);
 657         }
 658         r = dr ? LIMIT(r, top, bot - 1) : r;
 659         c = LIMIT(c, 0, pad_cols() - 1);
 660         move_cursor(r, c);
 661 }
 662
 663 static void insertchar(int c)
 664 {
 665         if (mode & MODE_WRAPREADY)
 666                 advance(1, -col, 1);
 667         if (mode & MODE_INSERT)
 668                 insert_chars(1);
 669         draw_char(c, row, col);
 670         if (col == pad_cols() - 1)
 671                 mode = BIT_SET(mode, MODE_WRAPREADY, 1);
 672         else
 673                 advance(0, 1, 1);
 674 }
 675
 676
 677 /* partial vt102 implementation */
 678
 679 static void escseq(void);
 680 static void escseq_cs(void);
 681 static void escseq_g0(void);
 682 static void escseq_g1(void);
 683 static void escseq_g2(void);
 684 static void escseq_g3(void);
 685 static void csiseq(void);
 686 static void csiseq_da(int c);
 687 static void csiseq_dsr(int c);
 688 static void modeseq(int c, int set);
 689
 690 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
 691
 692 static int readutf8(int c)
 693 {
 694         int result;
 695         int l = 1;
 696         if (~c & 0xc0)
 697                 return c;
 698         while (l < 6 && c & (0x40 >> l))
 699                 l++;
 700         result = (0x3f >> l) & c;
 701         while (l--)
 702                 result = (result << 6) | (readpty() & 0x3f);
 703         return result;
 704 }
 705
 706 #define unknown(ctl, c)
 707
 708 /* control sequences */
 709 static void ctlseq(void)
 710 {
 711         int c = readpty();
 712         switch (c) {
 713         case 0x09:      /* HT           horizontal tab to next tab stop */
 714                 advance(0, 8 - col % 8, 0);
 715                 break;
 716         case 0x0a:      /* LF           line feed */
 717         case 0x0b:      /* VT           line feed */
 718         case 0x0c:      /* FF           line feed */
 719                 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
 720                 break;
 721         case 0x08:      /* BS           backspace one column */
 722                 advance(0, -1, 0);
 723                 break;
 724         case 0x1b:      /* ESC          start escape sequence */
 725                 escseq();
 726                 break;
 727         case 0x0d:      /* CR           carriage return */
 728                 advance(0, -col, 0);
 729                 break;
 730         case 0x9b:      /* CSI          equivalent to ESC [ */
 731                 csiseq();
 732                 break;
 733         case 0x00:      /* NUL          ignored */
 734         case 0x07:      /* BEL          beep */
 735         case 0x7f:      /* DEL          ignored */
 736                 break;
 737         case 0x05:      /* ENQ          trigger answerback message */
 738         case 0x0e:      /* SO           activate G1 character set & newline */
 739         case 0x0f:      /* SI           activate G0 character set */
 740         case 0x11:      /* XON          resume transmission */
 741         case 0x13:      /* XOFF         stop transmission, ignore characters */
 742         case 0x18:      /* CAN          interrupt escape sequence */
 743         case 0x1a:      /* SUB          interrupt escape sequence */
 744                 unknown("ctlseq", c);
 745                 break;
 746         default:
 747                 c = readutf8(c);
 748                 if (isdw(c) && col + 1 == pad_cols() && ~mode & MODE_WRAPREADY)
 749                         insertchar(0);
 750                 if (!iszw(c))
 751                         insertchar(c);
 752                 if (isdw(c))
 753                         insertchar(c | DWCHAR);
 754                 break;
 755         }
 756 }
 757
 758 #define ESCM(c)         (((c) & 0xf0) == 0x20)
 759 #define ESCF(c)         ((c) > 0x30 && (c) < 0x7f)
 760
 761 /* escape sequences */
 762 static void escseq(void)
 763 {
 764         int c = readpty();
 765         while (ESCM(c))
 766                 c = readpty();
 767         switch (c) {
 768         case '[':       /* CSI          control sequence introducer */
 769                 csiseq();
 770                 break;
 771         case '%':       /* CS...        escseq_cs table */
 772                 escseq_cs();
 773                 break;
 774         case '(':       /* G0...        escseq_g0 table */
 775                 escseq_g0();
 776                 break;
 777         case ')':       /* G1...        escseq_g1 table */
 778                 escseq_g1();
 779                 break;
 780         case '*':       /* G2...        escseq_g2 table */
 781                 escseq_g2();
 782                 break;
 783         case '+':       /* G3...        escseq_g3 table */
 784                 escseq_g3();
 785                 break;
 786         case '7':       /* DECSC        save state (position, charset, attributes) */
 787                 misc_save(&term->sav);
 788                 break;
 789         case '8':       /* DECRC        restore most recently saved state */
 790                 misc_load(&term->sav);
 791                 break;
 792         case 'M':       /* RI           reverse line feed */
 793                 advance(-1, 0, 1);
 794                 break;
 795         case 'D':       /* IND          line feed */
 796                 advance(1, 0, 1);
 797                 break;
 798         case 'E':       /* NEL          newline */
 799                 advance(1, -col, 1);
 800                 break;
 801         case 'c':       /* RIS          reset */
 802                 term_reset();
 803                 break;
 804         case 'H':       /* HTS          set tab stop at current column */
 805         case 'Z':       /* DECID        DEC private ID; return ESC [ ? 6 c (VT102) */
 806         case '#':       /* DECALN       ("#8") DEC alignment test - fill screen with E's */
 807         case '>':       /* DECPNM       set numeric keypad mode */
 808         case '=':       /* DECPAM       set application keypad mode */
 809         case 'N':       /* SS2          select G2 charset for next char only */
 810         case 'O':       /* SS3          select G3 charset for next char only */
 811         case 'P':       /* DCS          device control string (ended by ST) */
 812         case 'X':       /* SOS          start of string */
 813         case '^':       /* PM           privacy message (ended by ST) */
 814         case '_':       /* APC          application program command (ended by ST) */
 815         case '\\':      /* ST           string terminator */
 816         case 'n':       /* LS2          invoke G2 charset */
 817         case 'o':       /* LS3          invoke G3 charset */
 818         case '|':       /* LS3R         invoke G3 charset as GR */
 819         case '}':       /* LS2R         invoke G2 charset as GR */
 820         case '~':       /* LS1R         invoke G1 charset as GR */
 821         case ']':       /* OSC          operating system command */
 822         case 'g':       /* BEL          alternate BEL */
 823         default:
 824                 unknown("escseq", c);
 825                 break;
 826         }
 827 }
 828
 829 static void escseq_cs(void)
 830 {
 831         int c = readpty();
 832         switch (c) {
 833         case '@':       /* CSDFL        select default charset (ISO646/8859-1) */
 834         case 'G':       /* CSUTF8       select UTF-8 */
 835         case '8':       /* CSUTF8       select UTF-8 (obsolete) */
 836         default:
 837                 unknown("escseq_cs", c);
 838                 break;
 839         }
 840 }
 841
 842 static void escseq_g0(void)
 843 {
 844         int c = readpty();
 845         switch (c) {
 846         case '8':       /* G0DFL        G0 charset = default mapping (ISO8859-1) */
 847         case '0':       /* G0GFX        G0 charset = VT100 graphics mapping */
 848         case 'U':       /* G0ROM        G0 charset = null mapping (straight to ROM) */
 849         case 'K':       /* G0USR        G0 charset = user defined mapping */
 850         case 'B':       /* G0TXT        G0 charset = ASCII mapping */
 851         default:
 852                 unknown("escseq_g0", c);
 853                 break;
 854         }
 855 }
 856
 857 static void escseq_g1(void)
 858 {
 859         int c = readpty();
 860         switch (c) {
 861         case '8':       /* G1DFL        G1 charset = default mapping (ISO8859-1) */
 862         case '0':       /* G1GFX        G1 charset = VT100 graphics mapping */
 863         case 'U':       /* G1ROM        G1 charset = null mapping (straight to ROM) */
 864         case 'K':       /* G1USR        G1 charset = user defined mapping */
 865         case 'B':       /* G1TXT        G1 charset = ASCII mapping */
 866         default:
 867                 unknown("escseq_g1", c);
 868                 break;
 869         }
 870 }
 871
 872 static void escseq_g2(void)
 873 {
 874         int c = readpty();
 875         switch (c) {
 876         case '8':       /* G2DFL        G2 charset = default mapping (ISO8859-1) */
 877         case '0':       /* G2GFX        G2 charset = VT100 graphics mapping */
 878         case 'U':       /* G2ROM        G2 charset = null mapping (straight to ROM) */
 879         case 'K':       /* G2USR        G2 charset = user defined mapping */
 880         default:
 881                 unknown("escseq_g2", c);
 882                 break;
 883         }
 884 }
 885
 886 static void escseq_g3(void)
 887 {
 888         int c = readpty();
 889         switch (c) {
 890         case '8':       /* G3DFL        G3 charset = default mapping (ISO8859-1) */
 891         case '0':       /* G3GFX        G3 charset = VT100 graphics mapping */
 892         case 'U':       /* G3ROM        G3 charset = null mapping (straight to ROM) */
 893         case 'K':       /* G3USR        G3 charset = user defined mapping */
 894         default:
 895                 unknown("escseq_g3", c);
 896                 break;
 897         }
 898 }
 899
 900 static int absrow(int r)
 901 {
 902         return origin() ? top + r : r;
 903 }
 904
 905 #define CSIP(c)                 (((c) & 0xf0) == 0x30)
 906 #define CSII(c)                 (((c) & 0xf0) == 0x20)
 907 #define CSIF(c)                 ((c) >= 0x40 && (c) < 0x80)
 908
 909 #define MAXCSIARGS      32
 910 /* ECMA-48 CSI sequences */
 911 static void csiseq(void)
 912 {
 913         int args[MAXCSIARGS + 8] = {0};
 914         int i;
 915         int n = 0;
 916         int c = readpty();
 917         int priv = 0;
 918
 919         if (strchr("<=>?", c)) {
 920                 priv = c;
 921                 c = readpty();
 922         }
 923         while (CSIP(c)) {
 924                 int arg = 0;
 925                 while (isdigit(c)) {
 926                         arg = arg * 10 + (c - '0');
 927                         c = readpty();
 928                 }
 929                 if (CSIP(c))
 930                         c = readpty();
 931                 if (n < MAXCSIARGS)
 932                         args[n++] = arg;
 933         }
 934         while (CSII(c))
 935                 c = readpty();
 936         switch (c) {
 937         case 'H':       /* CUP          move cursor to row, column */
 938         case 'f':       /* HVP          move cursor to row, column */
 939                 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
 940                 break;
 941         case 'J':       /* ED           erase display */
 942                 switch (args[0]) {
 943                 case 0:
 944                         kill_chars(col, pad_cols());
 945                         blank_rows(row + 1, pad_rows());
 946                         break;
 947                 case 1:
 948                         kill_chars(0, col + 1);
 949                         blank_rows(0, row - 1);
 950                         break;
 951                 case 2:
 952                         term_blank();
 953                         break;
 954                 }
 955                 break;
 956         case 'A':       /* CUU          move cursor up */
 957                 advance(-MAX(1, args[0]), 0, 0);
 958                 break;
 959         case 'e':       /* VPR          move cursor down */
 960         case 'B':       /* CUD          move cursor down */
 961                 advance(MAX(1, args[0]), 0, 0);
 962                 break;
 963         case 'a':       /* HPR          move cursor right */
 964         case 'C':       /* CUF          move cursor right */
 965                 advance(0, MAX(1, args[0]), 0);
 966                 break;
 967         case 'D':       /* CUB          move cursor left */
 968                 advance(0, -MAX(1, args[0]), 0);
 969                 break;
 970         case 'K':       /* EL           erase line */
 971                 switch (args[0]) {
 972                 case 0:
 973                         kill_chars(col, pad_cols());
 974                         break;
 975                 case 1:
 976                         kill_chars(0, col + 1);
 977                         break;
 978                 case 2:
 979                         kill_chars(0, pad_cols());
 980                         break;
 981                 }
 982                 break;
 983         case 'L':       /* IL           insert blank lines */
 984                 if (row >= top && row < bot)
 985                         insert_lines(MAX(1, args[0]));
 986                 break;
 987         case 'M':       /* DL           delete lines */
 988                 if (row >= top && row < bot)
 989                         delete_lines(MAX(1, args[0]));
 990                 break;
 991         case 'd':       /* VPA          move to row (current column) */
 992                 move_cursor(absrow(MAX(1, args[0]) - 1), col);
 993                 break;
 994         case 'm':       /* SGR          set graphic rendition */
 995                 if (!n)
 996                         setattr(0);
 997                 for (i = 0; i < n; i++) {
 998                         if (args[i] == 38 && args[i + 1] == 2) {
 999                                 mode &= ~MODE_CLR8;
1000                                 fg = (args[i + 2] << 16) |
1001                                         (args[i + 3] << 8) | args[i + 4];
1002                                 i += 5;
1003                                 continue;
1004                         }
1005                         if (args[i] == 38) {
1006                                 mode &= ~MODE_CLR8;
1007                                 fg = clrmap(args[i + 2]);
1008                                 i += 2;
1009                                 continue;
1010                         }
1011                         if (args[i] == 48 && args[i + 1] == 2) {
1012                                 bg = (args[i + 2] << 16) |
1013                                         (args[i + 3] << 8) | args[i + 4];
1014                                 i += 5;
1015                                 continue;
1016                         }
1017                         if (args[i] == 48) {
1018                                 bg = clrmap(args[i + 2]);
1019                                 i += 2;
1020                                 continue;
1021                         }
1022                         setattr(args[i]);
1023                 }
1024                 if (mode & MODE_CLR8 && mode & ATTR_BOLD && !FB)
1025                         for (i = 0; i < 8; i++)
1026                                 if (clr16[i] == fg)
1027                                         fg = clr16[8 + i];
1028                 break;
1029         case 'r':       /* DECSTBM      set scrolling region to (top, bottom) rows */
1030                 set_region(args[0], args[1]);
1031                 break;
1032         case 'c':       /* DA           return ESC [ ? 6 c (VT102) */
1033                 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
1034                 break;
1035         case 'h':       /* SM           set mode */
1036                 for (i = 0; i < n; i++)
1037                         modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
1038                 draw_cursor(1);
1039                 break;
1040         case 'l':       /* RM           reset mode */
1041                 for (i = 0; i < n; i++)
1042                         modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
1043                 draw_cursor(1);
1044                 break;
1045         case 'P':       /* DCH          delete characters on current line */
1046                 delete_chars(LIMIT(args[0], 1, pad_cols() - col));
1047                 break;
1048         case '@':       /* ICH          insert blank characters */
1049                 insert_chars(LIMIT(args[0], 1, pad_cols() - col));
1050                 break;
1051         case 'n':       /* DSR          device status report */
1052                 csiseq_dsr(args[0]);
1053                 break;
1054         case 'G':       /* CHA          move cursor to column in current row */
1055                 advance(0, MAX(0, args[0] - 1) - col, 0);
1056                 break;
1057         case 'X':       /* ECH          erase characters on current line */
1058                 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
1059                 break;
1060         case '[':       /* IGN          ignored control sequence */
1061         case 'E':       /* CNL          move cursor down and to column 1 */
1062         case 'F':       /* CPL          move cursor up and to column 1 */
1063         case 'g':       /* TBC          clear tab stop (CSI 3 g = clear all stops) */
1064         case 'q':       /* DECLL        set keyboard LEDs */
1065         case 's':       /* CUPSV        save cursor position */
1066         case 'u':       /* CUPRS        restore cursor position */
1067         case '`':       /* HPA          move cursor to column in current row */
1068         default:
1069                 unknown("csiseq", c);
1070                 break;
1071         }
1072 }
1073
1074 static void csiseq_da(int c)
1075 {
1076         switch (c) {
1077         case 0x00:
1078                 term_sendstr("\x1b[?6c");
1079                 break;
1080         default:
1081                 /* we don't care much about cursor shape */
1082                 /* printf("csiseq_da <0x%x>\n", c); */
1083                 break;
1084         }
1085 }
1086
1087 static void csiseq_dsr(int c)
1088 {
1089         char status[1 << 5];
1090         switch (c) {
1091         case 0x05:
1092                 term_sendstr("\x1b[0n");
1093                 break;
1094         case 0x06:
1095                 sprintf(status, "\x1b[%d;%dR",
1096                          (origin() ? row - top : row) + 1, col + 1);
1097                 term_sendstr(status);
1098                 break;
1099         default:
1100                 unknown("csiseq_dsr", c);
1101                 break;
1102         }
1103 }
1104
1105 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
1106 static void modeseq(int c, int set)
1107 {
1108         switch (c) {
1109         case 0x87:      /* DECAWM       Auto Wrap */
1110                 mode = BIT_SET(mode, MODE_WRAP, set);
1111                 break;
1112         case 0x99:      /* DECTCEM      Cursor on (set); Cursor off (reset) */
1113                 mode = BIT_SET(mode, MODE_CURSOR, set);
1114                 break;
1115         case 0x86:      /* DECOM        Sets relative coordinates (set); Sets absolute coordinates (reset) */
1116                 mode = BIT_SET(mode, MODE_ORIGIN, set);
1117                 break;
1118         case 0x14:      /* LNM          Line Feed / New Line Mode */
1119                 mode = BIT_SET(mode, MODE_AUTOCR, set);
1120                 break;
1121         case 0x04:      /* IRM          insertion/replacement mode (always reset) */
1122                 mode = BIT_SET(mode, MODE_INSERT, set);
1123                 break;
1124         case 0x00:      /* IGN          Error (Ignored) */
1125         case 0x01:      /* GATM         guarded-area transfer mode (ignored) */
1126         case 0x02:      /* KAM          keyboard action mode (always reset) */
1127         case 0x03:      /* CRM          control representation mode (always reset) */
1128         case 0x05:      /* SRTM         status-reporting transfer mode */
1129         case 0x06:      /* ERM          erasure mode (always set) */
1130         case 0x07:      /* VEM          vertical editing mode (ignored) */
1131         case 0x0a:      /* HEM          horizontal editing mode */
1132         case 0x0b:      /* PUM          positioning unit mode */
1133         case 0x0c:      /* SRM          send/receive mode (echo on/off) */
1134         case 0x0d:      /* FEAM         format effector action mode */
1135         case 0x0e:      /* FETM         format effector transfer mode */
1136         case 0x0f:      /* MATM         multiple area transfer mode */
1137         case 0x10:      /* TTM          transfer termination mode */
1138         case 0x11:      /* SATM         selected area transfer mode */
1139         case 0x12:      /* TSM          tabulation stop mode */
1140         case 0x13:      /* EBM          editing boundary mode */
1141 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
1142         case 0x80:      /* IGN          Error (Ignored) */
1143         case 0x81:      /* DECCKM       Cursorkeys application (set); Cursorkeys normal (reset) */
1144         case 0x82:      /* DECANM       ANSI (set); VT52 (reset) */
1145         case 0x83:      /* DECCOLM      132 columns (set); 80 columns (reset) */
1146         case 0x84:      /* DECSCLM      Jump scroll (set); Smooth scroll (reset) */
1147         case 0x85:      /* DECSCNM      Reverse screen (set); Normal screen (reset) */
1148         case 0x88:      /* DECARM       Auto Repeat */
1149         case 0x89:      /* DECINLM      Interlace */
1150         case 0x92:      /* DECPFF       Send FF to printer after print screen (set); No char after PS (reset) */
1151         case 0x93:      /* DECPEX       Print screen: prints full screen (set); prints scroll region (reset) */
1152         default:
1153                 unknown("modeseq", c);
1154                 break;
1155         }
1156 }