st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <signal.h>
  13 #include <sys/ioctl.h>
  14 #include <sys/select.h>
  15 #include <sys/stat.h>
  16 #include <sys/types.h>
  17 #include <sys/wait.h>
  18 #include <unistd.h>
  19 #include <X11/Xlib.h>
  20 #include <X11/keysym.h>
  21 #include <X11/Xutil.h>
  22
  23 /* Arbitrary sizes */
  24 #define ESC_TITLE_SIZ 256
  25 #define ESC_BUF_SIZ   256
  26 #define ESC_ARG_SIZ   16
  27 #define DRAW_BUF_SIZ  1024
  28
  29 #define SERRNO strerror(errno)
  30 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  31 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  32 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  33 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  34 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  35 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  36 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  37 #define IS_SET(flag) (term.mode & flag)
  38
  39 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  40 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  41 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
  42        CURSOR_SAVE, CURSOR_LOAD };
  43 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  44 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
  45 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  46 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  47
  48 typedef struct {
  49         char c;     /* character code  */
  50         char mode;  /* attribute flags */
  51         int fg;     /* foreground      */
  52         int bg;     /* background      */
  53         char state; /* state flags     */
  54 } Glyph;
  55
  56 typedef Glyph* Line;
  57
  58 typedef struct {
  59         Glyph attr;      /* current char attributes */
  60         int x;
  61         int y;
  62 } TCursor;
  63
  64 /* CSI Escape sequence structs */
  65 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  66 typedef struct {
  67         char buf[ESC_BUF_SIZ]; /* raw string */
  68         int len;                           /* raw string length */
  69         char priv;
  70         int arg[ESC_ARG_SIZ];
  71         int narg;                          /* nb of args */
  72         char mode;
  73 } CSIEscape;
  74
  75 /* Internal representation of the screen */
  76 typedef struct {
  77         int row;        /* nb row */
  78         int col;        /* nb col */
  79         Line* line; /* screen */
  80         TCursor c;      /* cursor */
  81         char hidec;
  82         int top;        /* top    scroll limit */
  83         int bot;        /* bottom scroll limit */
  84         int mode;       /* terminal mode flags */
  85         int esc;        /* escape state flags */
  86         char title[ESC_TITLE_SIZ];
  87         int titlelen;
  88 } Term;
  89
  90 /* Purely graphic info */
  91 typedef struct {
  92         Display* dis;
  93         Window win;
  94         Pixmap buf;
  95         int scr;
  96         int w;  /* window width  */
  97         int h;  /* window height */
  98         int bufw; /* pixmap width  */
  99         int bufh; /* pixmap height */
 100         int ch; /* char height */
 101         int cw; /* char width  */
 102 } XWindow;
 103
 104 typedef struct {
 105         KeySym k;
 106         char s[ESC_BUF_SIZ];
 107 } Key;
 108
 109 /* Drawing Context */
 110 typedef struct {
 111         unsigned long col[256];
 112         XFontStruct* font;
 113         XFontStruct* bfont;
 114         GC gc;
 115 } DC;
 116
 117 #include "config.h"
 118
 119 static void die(const char *errstr, ...);
 120 static void draw(int);
 121 static void execsh(void);
 122 static void sigchld(int);
 123 static void run(void);
 124
 125 static void csidump(void);
 126 static void csihandle(void);
 127 static void csiparse(void);
 128 static void csireset(void);
 129
 130 static void tclearregion(int, int, int, int);
 131 static void tcursor(int);
 132 static void twrapcursor(void);
 133 static void tdeletechar(int);
 134 static void tdeleteline(int);
 135 static void tinsertblank(int);
 136 static void tinsertblankline(int);
 137 static void tmoveto(int, int);
 138 static void tnew(int, int);
 139 static void tnewline(void);
 140 static void tputtab(void);
 141 static void tputc(char);
 142 static void tputs(char*, int);
 143 static void treset(void);
 144 static void tresize(int, int);
 145 static void tscroll(void);
 146 static void tscrollup(int);
 147 static void tscrolldown(int);
 148 static void tsetattr(int*, int);
 149 static void tsetchar(char);
 150 static void tsetscroll(int, int);
 151
 152 static void ttynew(void);
 153 static void ttyread(void);
 154 static void ttyresize(int, int);
 155 static void ttywrite(const char *, size_t);
 156
 157 static void xbell(void);
 158 static void xdraws(char *, Glyph, int, int, int);
 159 static void xhints(void);
 160 static void xclear(int, int, int, int);
 161 static void xcursor(int);
 162 static void xinit(void);
 163 static void xloadcols(void);
 164
 165 static void expose(XEvent *);
 166 static char* kmap(KeySym);
 167 static void kpress(XEvent *);
 168 static void resize(XEvent *);
 169
 170 static void (*handler[LASTEvent])(XEvent *) = {
 171         [KeyPress] = kpress,
 172         [Expose] = expose,
 173         [ConfigureNotify] = resize
 174 };
 175
 176 /* Globals */
 177 static DC dc;
 178 static XWindow xw;
 179 static Term term;
 180 static CSIEscape escseq;
 181 static int cmdfd;
 182 static pid_t pid;
 183 static int running;
 184
 185 #ifdef DEBUG
 186 void
 187 tdump(void) {
 188         int row, col;
 189         Glyph c;
 190
 191         for(row = 0; row < term.row; row++) {
 192                 for(col = 0; col < term.col; col++) {
 193                         if(col == term.c.x && row == term.c.y)
 194                                 putchar('#');
 195                         else {
 196                                 c = term.line[row][col];
 197                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 198                         }
 199                 }
 200                 putchar('\n');
 201         }
 202 }
 203 #endif
 204
 205 void
 206 die(const char *errstr, ...) {
 207         va_list ap;
 208
 209         va_start(ap, errstr);
 210         vfprintf(stderr, errstr, ap);
 211         va_end(ap);
 212         exit(EXIT_FAILURE);
 213 }
 214
 215 void
 216 execsh(void) {
 217         char *args[3] = {getenv("SHELL"), "-i", NULL};
 218         DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
 219         putenv("TERM=" TNAME);
 220         execvp(args[0], args);
 221 }
 222
 223 void
 224 xbell(void) { /* visual bell */
 225         XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
 226         XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
 227         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 228         /* usleep(30000); */
 229         draw(SCREEN_REDRAW);
 230 }
 231
 232 void
 233 sigchld(int a) {
 234         int stat = 0;
 235         if(waitpid(pid, &stat, 0) < 0)
 236                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 237         if(WIFEXITED(stat))
 238                 exit(WEXITSTATUS(stat));
 239         else
 240                 exit(EXIT_FAILURE);
 241 }
 242
 243 void
 244 ttynew(void) {
 245         int m, s;
 246         char *pts;
 247
 248         if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
 249                 die("openpt failed: %s\n", SERRNO);
 250         if(grantpt(m) < 0)
 251                 die("grantpt failed: %s\n", SERRNO);
 252         if(unlockpt(m) < 0)
 253                 die("unlockpt failed: %s\n", SERRNO);
 254         if(!(pts = ptsname(m)))
 255                 die("ptsname failed: %s\n", SERRNO);
 256         if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
 257                 die("Couldn't open slave: %s\n", SERRNO);
 258         fcntl(s, F_SETFL, O_NDELAY);
 259         switch(pid = fork()) {
 260         case -1:
 261                 die("fork failed\n");
 262                 break;
 263         case 0:
 264                 setsid(); /* create a new process group */
 265                 dup2(s, STDIN_FILENO);
 266                 dup2(s, STDOUT_FILENO);
 267                 dup2(s, STDERR_FILENO);
 268                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 269                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 270                 close(s);
 271                 close(m);
 272                 execsh();
 273                 break;
 274         default:
 275                 close(s);
 276                 cmdfd = m;
 277                 signal(SIGCHLD, sigchld);
 278         }
 279 }
 280
 281 void
 282 dump(char c) {
 283         static int col;
 284         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 285         if(++col % 10 == 0)
 286                 fprintf(stderr, "\n");
 287 }
 288
 289 void
 290 ttyread(void) {
 291         char buf[BUFSIZ] = {0};
 292         int ret;
 293
 294         if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
 295                 die("Couldn't read from shell: %s\n", SERRNO);
 296         else
 297                 tputs(buf, ret);
 298 }
 299
 300 void
 301 ttywrite(const char *s, size_t n) {
 302         if(write(cmdfd, s, n) == -1)
 303                 die("write error on tty: %s\n", SERRNO);
 304 }
 305
 306 void
 307 ttyresize(int x, int y) {
 308         struct winsize w;
 309
 310         w.ws_row = term.row;
 311         w.ws_col = term.col;
 312         w.ws_xpixel = w.ws_ypixel = 0;
 313         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 314                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 315 }
 316
 317 void
 318 tcursor(int mode) {
 319         static TCursor c;
 320
 321         if(mode == CURSOR_SAVE)
 322                 c = term.c;
 323         else if(mode == CURSOR_LOAD)
 324                 term.c = c, tmoveto(c.x, c.y);
 325 }
 326
 327 void
 328 treset(void) {
 329         term.c.attr.mode = ATTR_NULL;
 330         term.c.attr.fg = DefaultFG;
 331         term.c.attr.bg = DefaultBG;
 332         term.c.x = term.c.y = 0;
 333         term.hidec = 0;
 334         term.top = 0, term.bot = term.row - 1;
 335         term.mode = MODE_WRAP;
 336         tclearregion(0, 0, term.col-1, term.row-1);
 337 }
 338
 339 void
 340 tnew(int col, int row) {   /* screen size */
 341         term.row = row, term.col = col;
 342         term.top = 0, term.bot = term.row - 1;
 343         /* mode */
 344         term.mode = MODE_WRAP;
 345         /* cursor */
 346         term.c.attr.mode = ATTR_NULL;
 347         term.c.attr.fg = DefaultFG;
 348         term.c.attr.bg = DefaultBG;
 349         term.c.x = term.c.y = 0;
 350         term.hidec = 0;
 351         /* allocate screen */
 352         term.line = calloc(term.row, sizeof(Line));
 353         for(row = 0 ; row < term.row; row++)
 354                 term.line[row] = calloc(term.col, sizeof(Glyph));
 355 }
 356
 357 /* TODO: Replace with scrollup/scolldown */
 358 void
 359 tscroll(void) {
 360         Line temp = term.line[term.top];
 361         int i;
 362
 363         for(i = term.top; i < term.bot; i++)
 364                 term.line[i] = term.line[i+1];
 365         memset(temp, 0, sizeof(Glyph) * term.col);
 366         term.line[term.bot] = temp;
 367 }
 368
 369 void
 370 tscrolldown (int n) {
 371         int i;
 372         Line temp;
 373
 374         LIMIT(n, 0, term.bot-term.top+1);
 375
 376         for(i = 0; i < n; i++)
 377                 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
 378
 379         for(i = term.bot; i >= term.top+n; i--) {
 380                 temp = term.line[i];
 381                 term.line[i] = term.line[i-n];
 382                 term.line[i-n] = temp;
 383         }
 384 }
 385
 386 void
 387 tscrollup (int n) {
 388         int i;
 389         Line temp;
 390         LIMIT(n, 0, term.bot-term.top+1);
 391
 392         for(i = 0; i < n; i++)
 393                 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
 394
 395          for(i = term.top; i <= term.bot-n; i++) {
 396                  temp = term.line[i];
 397                  term.line[i] = term.line[i+n];
 398                  term.line[i+n] = temp;
 399          }
 400 }
 401
 402 void
 403 tnewline(void) {
 404         int y = term.c.y + 1;
 405         if(y > term.bot)
 406                 tscroll(), y = term.bot;
 407         tmoveto(0, y);
 408 }
 409
 410 void
 411 csiparse(void) {
 412         /* int noarg = 1; */
 413         char *p = escseq.buf;
 414
 415         escseq.narg = 0;
 416         if(*p == '?')
 417                 escseq.priv = 1, p++;
 418
 419         while(p < escseq.buf+escseq.len) {
 420                 while(isdigit(*p)) {
 421                         escseq.arg[escseq.narg] *= 10;
 422                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 423                 }
 424                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 425                         escseq.narg++, p++;
 426                 else {
 427                         escseq.mode = *p;
 428                         escseq.narg++;
 429                         return;
 430                 }
 431         }
 432 }
 433
 434 void
 435 tmoveto(int x, int y) {
 436         term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
 437         term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
 438 }
 439
 440 void
 441 twrapcursor(void) {
 442         int y = term.c.y+1;
 443         if(y > term.bot) {
 444                 tmoveto(0, term.bot);
 445                 tscroll();
 446         } else
 447                 tmoveto(0, y);
 448 }
 449
 450 void
 451 tsetchar(char c) {
 452         term.line[term.c.y][term.c.x] = term.c.attr;
 453         term.line[term.c.y][term.c.x].c = c;
 454         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 455 }
 456
 457 void
 458 tclearregion(int x1, int y1, int x2, int y2) {
 459         int y, temp;
 460
 461         if(x1 > x2)
 462                 temp = x1, x1 = x2, x2 = temp;
 463         if(y1 > y2)
 464                 temp = y1, y1 = y2, y2 = temp;
 465
 466         LIMIT(x1, 0, term.col-1);
 467         LIMIT(x2, 0, term.col-1);
 468         LIMIT(y1, 0, term.row-1);
 469         LIMIT(y2, 0, term.row-1);
 470
 471         for(y = y1; y <= y2; y++)
 472                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 473 }
 474
 475 void
 476 tdeletechar(int n) {
 477         int src = term.c.x + n;
 478         int dst = term.c.x;
 479         int size = term.col - src;
 480
 481         if(src >= term.col) {
 482                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 483                 return;
 484         }
 485         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 486         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 487 }
 488
 489 void
 490 tinsertblank(int n) {
 491         int src = term.c.x;
 492         int dst = src + n;
 493         int size = term.col - dst;
 494
 495         if(dst >= term.col) {
 496                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 497                 return;
 498         }
 499         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 500         tclearregion(src, term.c.y, dst - 1, term.c.y);
 501 }
 502
 503 void
 504 tinsertblankline(int n) {
 505         int i;
 506         Line blank;
 507         int bot = term.bot;
 508
 509         if(term.c.y > term.bot)
 510                 bot = term.row - 1;
 511         else if(term.c.y < term.top)
 512                 bot = term.top - 1;
 513         if(term.c.y + n >= bot) {
 514                 tclearregion(0, term.c.y, term.col-1, bot);
 515                 return;
 516         }
 517         for(i = bot; i >= term.c.y+n; i--) {
 518                 /* swap deleted line <-> blanked line */
 519                 blank = term.line[i];
 520                 term.line[i] = term.line[i-n];
 521                 term.line[i-n] = blank;
 522                 /* blank it */
 523                 memset(blank, 0, term.col * sizeof(Glyph));
 524         }
 525 }
 526
 527 void
 528 tdeleteline(int n) {
 529         int i;
 530         Line blank;
 531         int bot = term.bot;
 532
 533         if(term.c.y > term.bot)
 534                 bot = term.row - 1;
 535         else if(term.c.y < term.top)
 536                 bot = term.top - 1;
 537         if(term.c.y + n >= bot) {
 538                 tclearregion(0, term.c.y, term.col-1, bot);
 539                 return;
 540         }
 541         for(i = term.c.y; i <= bot-n; i++) {
 542                 /* swap deleted line <-> blanked line */
 543                 blank = term.line[i];
 544                 term.line[i] = term.line[i+n];
 545                 term.line[i+n] = blank;
 546                 /* blank it */
 547                 memset(blank, 0, term.col * sizeof(Glyph));
 548         }
 549 }
 550
 551 void
 552 tsetattr(int *attr, int l) {
 553         int i;
 554
 555         for(i = 0; i < l; i++) {
 556                 switch(attr[i]) {
 557                 case 0:
 558                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 559                         term.c.attr.fg = DefaultFG;
 560                         term.c.attr.bg = DefaultBG;
 561                         break;
 562                 case 1:
 563                         term.c.attr.mode |= ATTR_BOLD;
 564                         break;
 565                 case 4:
 566                         term.c.attr.mode |= ATTR_UNDERLINE;
 567                         break;
 568                 case 7:
 569                         term.c.attr.mode |= ATTR_REVERSE;
 570                         break;
 571                 case 22:
 572                         term.c.attr.mode &= ~ATTR_BOLD;
 573                         break;
 574                 case 24:
 575                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 576                         break;
 577                 case 27:
 578                         term.c.attr.mode &= ~ATTR_REVERSE;
 579                         break;
 580                 case 38:
 581                         if (i + 2 < l && attr[i + 1] == 5) {
 582                                 i += 2;
 583                                 if (BETWEEN(attr[i], 0, 255))
 584                                         term.c.attr.fg = attr[i];
 585                                 else
 586                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 587                         }
 588                         else
 589                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 590                         break;
 591                 case 39:
 592                         term.c.attr.fg = DefaultFG;
 593                         break;
 594                 case 48:
 595                         if (i + 2 < l && attr[i + 1] == 5) {
 596                                 i += 2;
 597                                 if (BETWEEN(attr[i], 0, 255))
 598                                         term.c.attr.bg = attr[i];
 599                                 else
 600                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 601                         }
 602                         else
 603                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 604                         break;
 605                 case 49:
 606                         term.c.attr.bg = DefaultBG;
 607                         break;
 608                 default:
 609                         if(BETWEEN(attr[i], 30, 37))
 610                                 term.c.attr.fg = attr[i] - 30;
 611                         else if(BETWEEN(attr[i], 40, 47))
 612                                 term.c.attr.bg = attr[i] - 40;
 613                         else if(BETWEEN(attr[i], 90, 97))
 614                                 term.c.attr.fg = attr[i] - 90 + 8;
 615                         else if(BETWEEN(attr[i], 100, 107))
 616                                 term.c.attr.fg = attr[i] - 100 + 8;
 617                         else
 618                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 619                         break;
 620                 }
 621         }
 622 }
 623
 624 void
 625 tsetscroll(int t, int b) {
 626         int temp;
 627
 628         LIMIT(t, 0, term.row-1);
 629         LIMIT(b, 0, term.row-1);
 630         if(t > b) {
 631                 temp = t;
 632                 t = b;
 633                 b = temp;
 634         }
 635         term.top = t;
 636         term.bot = b;
 637 }
 638
 639 void
 640 csihandle(void) {
 641         switch(escseq.mode) {
 642         default:
 643         unknown:
 644                 printf("erresc: unknown csi ");
 645                 csidump();
 646                 /* die(""); */
 647                 break;
 648         case '@': /* ICH -- Insert <n> blank char */
 649                 DEFAULT(escseq.arg[0], 1);
 650                 tinsertblank(escseq.arg[0]);
 651                 break;
 652         case 'A': /* CUU -- Cursor <n> Up */
 653         case 'e':
 654                 DEFAULT(escseq.arg[0], 1);
 655                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 656                 break;
 657         case 'B': /* CUD -- Cursor <n> Down */
 658                 DEFAULT(escseq.arg[0], 1);
 659                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 660                 break;
 661         case 'C': /* CUF -- Cursor <n> Forward */
 662         case 'a':
 663                 DEFAULT(escseq.arg[0], 1);
 664                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 665                 break;
 666         case 'D': /* CUB -- Cursor <n> Backward */
 667                 DEFAULT(escseq.arg[0], 1);
 668                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 669                 break;
 670         case 'E': /* CNL -- Cursor <n> Down and first col */
 671                 DEFAULT(escseq.arg[0], 1);
 672                 tmoveto(0, term.c.y+escseq.arg[0]);
 673                 break;
 674         case 'F': /* CPL -- Cursor <n> Up and first col */
 675                 DEFAULT(escseq.arg[0], 1);
 676                 tmoveto(0, term.c.y-escseq.arg[0]);
 677                 break;
 678         case 'G': /* CHA -- Move to <col> */
 679         case '`': /* XXX: HPA -- same? */
 680                 DEFAULT(escseq.arg[0], 1);
 681                 tmoveto(escseq.arg[0]-1, term.c.y);
 682                 break;
 683         case 'H': /* CUP -- Move to <row> <col> */
 684         case 'f': /* XXX: HVP -- same? */
 685                 DEFAULT(escseq.arg[0], 1);
 686                 DEFAULT(escseq.arg[1], 1);
 687                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 688                 break;
 689         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 690         case 'J': /* ED -- Clear screen */
 691                 switch(escseq.arg[0]) {
 692                 case 0: /* below */
 693                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 694                         break;
 695                 case 1: /* above */
 696                         tclearregion(0, 0, term.c.x, term.c.y);
 697                         break;
 698                 case 2: /* all */
 699                         tclearregion(0, 0, term.col-1, term.row-1);
 700                         break;
 701                 case 3: /* XXX: erase saved lines (xterm) */
 702                 default:
 703                         goto unknown;
 704                 }
 705                 break;
 706         case 'K': /* EL -- Clear line */
 707                 switch(escseq.arg[0]) {
 708                 case 0: /* right */
 709                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 710                         break;
 711                 case 1: /* left */
 712                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 713                         break;
 714                 case 2: /* all */
 715                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 716                         break;
 717                 }
 718                 break;
 719         case 'S': /* SU -- Scroll <n> line up */
 720                 DEFAULT(escseq.arg[0], 1);
 721                 tscrollup(escseq.arg[0]);
 722                 break;
 723         case 'T': /* SD -- Scroll <n> line down */
 724                 DEFAULT(escseq.arg[0], 1);
 725                 tscrolldown(escseq.arg[0]);
 726                 break;
 727         case 'L': /* IL -- Insert <n> blank lines */
 728                 DEFAULT(escseq.arg[0], 1);
 729                 tinsertblankline(escseq.arg[0]);
 730                 break;
 731         case 'l': /* RM -- Reset Mode */
 732                 if(escseq.priv) {
 733                         switch(escseq.arg[0]) {
 734                         case 1:
 735                                 term.mode &= ~MODE_APPKEYPAD;
 736                                 break;
 737                         case 7:
 738                                 term.mode &= ~MODE_WRAP;
 739                                 break;
 740                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 741                                 break;
 742                         case 25:
 743                                 term.hidec = 1;
 744                                 break;
 745                         case 1048: /* XXX: no alt. screen to erase/save */
 746                         case 1049:
 747                                 tcursor(CURSOR_LOAD);
 748                                 tclearregion(0, 0, term.col-1, term.row-1);
 749                                 break;
 750                         default:
 751                                 goto unknown;
 752                         }
 753                 } else {
 754                         switch(escseq.arg[0]) {
 755                         case 4:
 756                                 term.mode &= ~MODE_INSERT;
 757                                 break;
 758                         default:
 759                                 goto unknown;
 760                         }
 761                 }
 762                 break;
 763         case 'M': /* DL -- Delete <n> lines */
 764                 DEFAULT(escseq.arg[0], 1);
 765                 tdeleteline(escseq.arg[0]);
 766                 break;
 767         case 'X': /* ECH -- Erase <n> char */
 768                 DEFAULT(escseq.arg[0], 1);
 769                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 770                 break;
 771         case 'P': /* DCH -- Delete <n> char */
 772                 DEFAULT(escseq.arg[0], 1);
 773                 tdeletechar(escseq.arg[0]);
 774                 break;
 775         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 776         case 'd': /* VPA -- Move to <row> */
 777                 DEFAULT(escseq.arg[0], 1);
 778                 tmoveto(term.c.x, escseq.arg[0]-1);
 779                 break;
 780         case 'h': /* SM -- Set terminal mode */
 781                 if(escseq.priv) {
 782                         switch(escseq.arg[0]) {
 783                         case 1:
 784                                 term.mode |= MODE_APPKEYPAD;
 785                                 break;
 786                         case 7:
 787                                 term.mode |= MODE_WRAP;
 788                                 break;
 789                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 790                                 break;
 791                         case 25:
 792                                 term.hidec = 0;
 793                                 break;
 794                         case 1048:
 795                         case 1049: /* XXX: no alt. screen to erase/save */
 796                                 tcursor(CURSOR_SAVE);
 797                                 tclearregion(0, 0, term.col-1, term.row-1);
 798                                 break;
 799                         default: goto unknown;
 800                         }
 801                 } else {
 802                         switch(escseq.arg[0]) {
 803                         case 4:
 804                                 term.mode |= MODE_INSERT;
 805                                 break;
 806                         default: goto unknown;
 807                         }
 808                 };
 809                 break;
 810         case 'm': /* SGR -- Terminal attribute (color) */
 811                 tsetattr(escseq.arg, escseq.narg);
 812                 break;
 813         case 'r': /* DECSTBM -- Set Scrolling Region */
 814                 if(escseq.priv)
 815                         goto unknown;
 816                 else {
 817                         DEFAULT(escseq.arg[0], 1);
 818                         DEFAULT(escseq.arg[1], term.row);
 819                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 820                 }
 821                 break;
 822         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 823                 tcursor(CURSOR_SAVE);
 824                 break;
 825         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 826                 tcursor(CURSOR_LOAD);
 827                 break;
 828         }
 829 }
 830
 831 void
 832 csidump(void) {
 833         int i;
 834         printf("ESC [ %s", escseq.priv ? "? " : "");
 835         if(escseq.narg)
 836                 for(i = 0; i < escseq.narg; i++)
 837                         printf("%d ", escseq.arg[i]);
 838         if(escseq.mode)
 839                 putchar(escseq.mode);
 840         putchar('\n');
 841 }
 842
 843 void
 844 csireset(void) {
 845         memset(&escseq, 0, sizeof(escseq));
 846 }
 847
 848 void
 849 tputtab(void) {
 850         int space = TAB - term.c.x % TAB;
 851         tmoveto(term.c.x + space, term.c.y);
 852 }
 853
 854 void
 855 tputc(char c) {
 856         if(term.esc & ESC_START) {
 857                 if(term.esc & ESC_CSI) {
 858                         escseq.buf[escseq.len++] = c;
 859                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 860                                 term.esc = 0;
 861                                 csiparse(), csihandle();
 862                         }
 863                 } else if(term.esc & ESC_OSC) {
 864                         if(c == ';') {
 865                                 term.titlelen = 0;
 866                                 term.esc = ESC_START | ESC_TITLE;
 867                         }
 868                 } else if(term.esc & ESC_TITLE) {
 869                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 870                                 term.esc = 0;
 871                                 term.title[term.titlelen] = '\0';
 872                                 XStoreName(xw.dis, xw.win, term.title);
 873                         } else {
 874                                 term.title[term.titlelen++] = c;
 875                         }
 876                 } else if(term.esc & ESC_ALTCHARSET) {
 877                         switch(c) {
 878                         case '0': /* Line drawing crap */
 879                                 term.c.attr.mode |= ATTR_GFX;
 880                                 break;
 881                         case 'B': /* Back to regular text */
 882                                 term.c.attr.mode &= ~ATTR_GFX;
 883                                 break;
 884                         default:
 885                                 printf("esc unhandled charset: ESC ( %c\n", c);
 886                         }
 887                         term.esc = 0;
 888                 } else {
 889                         switch(c) {
 890                         case '[':
 891                                 term.esc |= ESC_CSI;
 892                                 break;
 893                         case ']':
 894                                 term.esc |= ESC_OSC;
 895                                 break;
 896                         case '(':
 897                                 term.esc |= ESC_ALTCHARSET;
 898                                 break;
 899                         case 'A':
 900                                 tmoveto(term.c.x, term.c.y-1);
 901                                 term.esc = 0;
 902                                 break;
 903                         case 'B':
 904                                 tmoveto(term.c.x, term.c.y+1);
 905                                 term.esc = 0;
 906                                 break;
 907                         case 'C':
 908                                 tmoveto(term.c.x+1, term.c.y);
 909                                 term.esc = 0;
 910                                 break;
 911                         case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
 912                                 tmoveto(term.c.x-1, term.c.y);
 913                                 term.esc = 0;
 914                                 break;
 915                         case 'E': /* NEL -- Next line */
 916                                 tnewline();
 917                                 term.esc = 0;
 918                                 break;
 919                         case 'M': /* RI -- Reverse index */
 920                                 if(term.c.y == term.top)
 921                                         tscrolldown(1);
 922                                 else
 923                                         tmoveto(term.c.x, term.c.y-1);
 924                                 term.esc = 0;
 925                                 break;
 926                         case 'c': /* RIS -- Reset to inital state */
 927                                 treset();
 928                                 term.esc = 0;
 929                                 break;
 930                         case '=': /* DECPAM */
 931                                 term.mode |= MODE_APPKEYPAD;
 932                                 term.esc = 0;
 933                                 break;
 934                         case '>': /* DECPNM */
 935                                 term.mode &= ~MODE_APPKEYPAD;
 936                                 term.esc = 0;
 937                                 break;
 938                         case '7':
 939                                 tcursor(CURSOR_SAVE);
 940                                 term.esc = 0;
 941                                 break;
 942                         case '8':
 943                                 tcursor(CURSOR_LOAD);
 944                                 term.esc = 0;
 945                                 break;
 946                         default:
 947                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
 948                                 term.esc = 0;
 949                         }
 950                 }
 951         } else {
 952                 switch(c) {
 953                 case '\t':
 954                         tputtab();
 955                         break;
 956                 case '\b':
 957                         tmoveto(term.c.x-1, term.c.y);
 958                         break;
 959                 case '\r':
 960                         tmoveto(0, term.c.y);
 961                         break;
 962                 case '\n':
 963                         tnewline();
 964                         break;
 965                 case '\a':
 966                         xbell();
 967                         break;
 968                 case '\033':
 969                         csireset();
 970                         term.esc = ESC_START;
 971                         break;
 972                 default:
 973                         tsetchar(c);
 974                         if(term.c.x+1 < term.col) {
 975                                 tmoveto(term.c.x+1, term.c.y);
 976                         } else if(IS_SET(MODE_WRAP))
 977                                 twrapcursor();
 978                         break;
 979                 }
 980         }
 981 }
 982
 983 void
 984 tputs(char *s, int len) {
 985         for(; len > 0; len--)
 986                 tputc(*s++);
 987 }
 988
 989 void
 990 tresize(int col, int row) {
 991         int i;
 992         int minrow = MIN(row, term.row);
 993         int mincol = MIN(col, term.col);
 994
 995         if(col < 1 || row < 1)
 996                 return;
 997
 998         for(i = row; i < term.row; i++)
 999                 free(term.line[i]);
1000         term.line = realloc(term.line, row * sizeof(Line));
1001         for(i = 0; i < minrow; i++) {
1002                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1003                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1004         }
1005         for(/* i == minrow */; i < row; i++)
1006                 term.line[i] = calloc(col, sizeof(Glyph));
1007
1008         LIMIT(term.c.x, 0, col-1);
1009         LIMIT(term.c.y, 0, row-1);
1010         LIMIT(term.top, 0, row-1);
1011         LIMIT(term.bot, 0, row-1);
1012
1013         term.bot = row-1;
1014         term.col = col, term.row = row;
1015 }
1016
1017 void
1018 xloadcols(void) {
1019         int i, r, g, b;
1020         XColor color;
1021         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1022         unsigned long white = WhitePixel(xw.dis, xw.scr);
1023
1024         for(i = 0; i < 16; i++) {
1025                 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1026                         dc.col[i] = white;
1027                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1028                 } else
1029                         dc.col[i] = color.pixel;
1030         }
1031
1032         /* same colors as xterm */
1033         for(r = 0; r < 6; r++)
1034                 for(g = 0; g < 6; g++)
1035                         for(b = 0; b < 6; b++) {
1036                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1037                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1038                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1039                                 if (!XAllocColor(xw.dis, cmap, &color)) {
1040                                         dc.col[i] = white;
1041                                         fprintf(stderr, "Could not allocate color %d\n", i);
1042                                 } else
1043                                         dc.col[i] = color.pixel;
1044                                 i++;
1045                         }
1046
1047         for(r = 0; r < 24; r++, i++) {
1048                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1049                 if (!XAllocColor(xw.dis, cmap, &color)) {
1050                         dc.col[i] = white;
1051                         fprintf(stderr, "Could not allocate color %d\n", i);
1052                 } else
1053                         dc.col[i] = color.pixel;
1054         }
1055 }
1056
1057 void
1058 xclear(int x1, int y1, int x2, int y2) {
1059         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1060         XFillRectangle(xw.dis, xw.buf, dc.gc,
1061                        x1 * xw.cw, y1 * xw.ch,
1062                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1063 }
1064
1065 void
1066 xhints(void)
1067 {
1068         XClassHint class = {TNAME, TNAME};
1069         XWMHints wm = {.flags = InputHint, .input = 1};
1070         XSizeHints size = {
1071                 .flags = PSize | PResizeInc | PBaseSize,
1072                 .height = xw.h,
1073                 .width = xw.w,
1074                 .height_inc = xw.ch,
1075                 .width_inc = xw.cw,
1076                 .base_height = 2*BORDER,
1077                 .base_width = 2*BORDER,
1078         };
1079         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1080 }
1081
1082 void
1083 xinit(void) {
1084         xw.dis = XOpenDisplay(NULL);
1085         xw.scr = XDefaultScreen(xw.dis);
1086         if(!xw.dis)
1087                 die("Can't open display\n");
1088
1089         /* font */
1090         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1091                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1092
1093         /* XXX: Assuming same size for bold font */
1094         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1095         xw.ch = dc.font->ascent + dc.font->descent;
1096
1097         /* colors */
1098         xloadcols();
1099
1100         term.c.attr.fg = DefaultFG;
1101         term.c.attr.bg = DefaultBG;
1102         term.c.attr.mode = ATTR_NULL;
1103         /* windows */
1104         xw.h = term.row * xw.ch + 2*BORDER;
1105         xw.w = term.col * xw.cw + 2*BORDER;
1106         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1107                         xw.w, xw.h, 0,
1108                         dc.col[DefaultBG],
1109                         dc.col[DefaultBG]);
1110         xw.bufw = xw.w - 2*BORDER;
1111         xw.bufh = xw.h - 2*BORDER;
1112         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1113         /* gc */
1114         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1115         XMapWindow(xw.dis, xw.win);
1116         xhints();
1117         XStoreName(xw.dis, xw.win, "st");
1118         XSync(xw.dis, 0);
1119 }
1120
1121 void
1122 xdraws(char *s, Glyph base, int x, int y, int len) {
1123         unsigned long xfg, xbg;
1124         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1125         int i;
1126
1127         if(base.mode & ATTR_REVERSE)
1128                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1129         else
1130                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1131
1132         XSetBackground(xw.dis, dc.gc, xbg);
1133         XSetForeground(xw.dis, dc.gc, xfg);
1134
1135         if(base.mode & ATTR_GFX)
1136                 for(i = 0; i < len; i++)
1137                         s[i] = gfx[(int)s[i]];
1138
1139         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1140         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1141
1142         if(base.mode & ATTR_UNDERLINE)
1143                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1144 }
1145
1146 void
1147 xcursor(int mode) {
1148         static int oldx = 0;
1149         static int oldy = 0;
1150         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1151
1152         LIMIT(oldx, 0, term.col-1);
1153         LIMIT(oldy, 0, term.row-1);
1154
1155         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1156                 g.c = term.line[term.c.y][term.c.x].c;
1157
1158         /* remove the old cursor */
1159         if(term.line[oldy][oldx].state & GLYPH_SET)
1160                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1161         else
1162                 xclear(oldx, oldy, oldx, oldy);
1163
1164         /* draw the new one */
1165         if(mode == CURSOR_DRAW) {
1166                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1167                 oldx = term.c.x, oldy = term.c.y;
1168         }
1169 }
1170
1171 #ifdef DEBUG
1172 /* basic drawing routines */
1173 void
1174 xdrawc(int x, int y, Glyph g) {
1175         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1176         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1177         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1178         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1179         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1180 }
1181
1182 void
1183 draw(int dummy) {
1184         int x, y;
1185
1186         xclear(0, 0, term.col-1, term.row-1);
1187         for(y = 0; y < term.row; y++)
1188                 for(x = 0; x < term.col; x++)
1189                         if(term.line[y][x].state & GLYPH_SET)
1190                                 xdrawc(x, y, term.line[y][x]);
1191
1192         if(!term.hidec)
1193                 xcursor(CURSOR_DRAW);
1194         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1195         XFlush(xw.dis);
1196 }
1197
1198 #else
1199 /* optimized drawing routine */
1200 void
1201 draw(int redraw_all) {
1202         int i, x, y, ox;
1203         Glyph base, new;
1204         char buf[DRAW_BUF_SIZ];
1205
1206         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1207         XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1208         for(y = 0; y < term.row; y++) {
1209                 base = term.line[y][0];
1210                 i = ox = 0;
1211                 for(x = 0; x < term.col; x++) {
1212                         new = term.line[y][x];
1213                         if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1214                                 buf[i++] = new.c;
1215                         else {
1216                                 xdraws(buf, base, ox, y, i);
1217                                 buf[0] = new.c;
1218                                 i = 1;
1219                                 ox = x;
1220                                 base = new;
1221                         }
1222                 }
1223                 xdraws(buf, base, ox, y, i);
1224         }
1225         xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1226         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1227         XFlush(xw.dis);
1228 }
1229
1230 #endif
1231
1232 void
1233 expose(XEvent *ev) {
1234         draw(SCREEN_REDRAW);
1235 }
1236
1237 char*
1238 kmap(KeySym k) {
1239         int i;
1240         for(i = 0; i < LEN(key); i++)
1241                 if(key[i].k == k)
1242                         return (char*)key[i].s;
1243         return NULL;
1244 }
1245
1246 void
1247 kpress(XEvent *ev) {
1248         XKeyEvent *e = &ev->xkey;
1249         KeySym ksym;
1250         char buf[32];
1251         char *customkey;
1252         int len;
1253         int meta;
1254         int shift;
1255
1256         meta = e->state & Mod1Mask;
1257         shift = e->state & ShiftMask;
1258         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1259
1260         if((customkey = kmap(ksym)))
1261                 ttywrite(customkey, strlen(customkey));
1262         else if(len > 0) {
1263                 buf[sizeof(buf)-1] = '\0';
1264                 if(meta && len == 1)
1265                         ttywrite("\033", 1);
1266                 ttywrite(buf, len);
1267         } else
1268                 switch(ksym) {
1269                 case XK_Up:
1270                 case XK_Down:
1271                 case XK_Left:
1272                 case XK_Right:
1273                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1274                         ttywrite(buf, 3);
1275                         break;
1276                 case XK_Insert:
1277                         if(shift)
1278                                 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1279                         break;
1280                 default:
1281                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1282                         break;
1283                 }
1284 }
1285
1286 void
1287 resize(XEvent *e) {
1288         int col, row;
1289
1290         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1291                 return;
1292
1293         xw.w = e->xconfigure.width;
1294         xw.h = e->xconfigure.height;
1295         xw.bufw = xw.w - 2*BORDER;
1296         xw.bufh = xw.h - 2*BORDER;
1297         col = xw.bufw / xw.cw;
1298         row = xw.bufh / xw.ch;
1299         tresize(col, row);
1300         ttyresize(col, row);
1301         XFreePixmap(xw.dis, xw.buf);
1302         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1303         draw(SCREEN_REDRAW);
1304 }
1305
1306 void
1307 run(void) {
1308         XEvent ev;
1309         fd_set rfd;
1310         int xfd = XConnectionNumber(xw.dis);
1311
1312         running = 1;
1313         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1314         XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1315
1316         while(running) {
1317                 FD_ZERO(&rfd);
1318                 FD_SET(cmdfd, &rfd);
1319                 FD_SET(xfd, &rfd);
1320                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1321                         if(errno == EINTR)
1322                                 continue;
1323                         die("select failed: %s\n", SERRNO);
1324                 }
1325                 if(FD_ISSET(cmdfd, &rfd)) {
1326                         ttyread();
1327                         draw(SCREEN_UPDATE);
1328                 }
1329                 while(XPending(xw.dis)) {
1330                         XNextEvent(xw.dis, &ev);
1331                         if(handler[ev.type])
1332                                 (handler[ev.type])(&ev);
1333                 }
1334         }
1335 }
1336
1337 int
1338 main(int argc, char *argv[]) {
1339         if(argc == 2 && !strncmp("-v", argv[1], 3))
1340                 die("st-" VERSION ", © 2009 st engineers\n");
1341         else if(argc != 1)
1342                 die("usage: st [-v]\n");
1343         setlocale(LC_CTYPE, "");
1344         tnew(80, 24);
1345         ttynew();
1346         xinit();
1347         run();
1348         return 0;
1349 }