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 #if   defined(LINUX)
  24  #include <pty.h>
  25 #elif defined(OPENBSD)
  26  #include <util.h>
  27 #elif defined(FREEBSD)
  28  #include <libutil.h>
  29 #endif
  30
  31 /* Arbitrary sizes */
  32 #define ESC_TITLE_SIZ 256
  33 #define ESC_BUF_SIZ   256
  34 #define ESC_ARG_SIZ   16
  35 #define DRAW_BUF_SIZ  1024
  36
  37 #define SERRNO strerror(errno)
  38 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  39 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  40 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  41 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  42 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  43 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  44 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  45 #define IS_SET(flag) (term.mode & (flag))
  46
  47 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  48 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  49 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
  50        CURSOR_SAVE, CURSOR_LOAD };
  51 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  52 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
  53 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  54 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  55
  56 typedef struct {
  57         char c;     /* character code  */
  58         char mode;  /* attribute flags */
  59         int fg;     /* foreground      */
  60         int bg;     /* background      */
  61         char state; /* state flags     */
  62 } Glyph;
  63
  64 typedef Glyph* Line;
  65
  66 typedef struct {
  67         Glyph attr;      /* current char attributes */
  68         int x;
  69         int y;
  70 } TCursor;
  71
  72 /* CSI Escape sequence structs */
  73 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  74 typedef struct {
  75         char buf[ESC_BUF_SIZ]; /* raw string */
  76         int len;                           /* raw string length */
  77         char priv;
  78         int arg[ESC_ARG_SIZ];
  79         int narg;                          /* nb of args */
  80         char mode;
  81 } CSIEscape;
  82
  83 /* Internal representation of the screen */
  84 typedef struct {
  85         int row;        /* nb row */
  86         int col;        /* nb col */
  87         Line* line; /* screen */
  88         TCursor c;      /* cursor */
  89         char hidec;
  90         int top;        /* top    scroll limit */
  91         int bot;        /* bottom scroll limit */
  92         int mode;       /* terminal mode flags */
  93         int esc;        /* escape state flags */
  94         char title[ESC_TITLE_SIZ];
  95         int titlelen;
  96 } Term;
  97
  98 /* Purely graphic info */
  99 typedef struct {
 100         Display* dis;
 101         Window win;
 102         Pixmap buf;
 103         int scr;
 104         int w;  /* window width  */
 105         int h;  /* window height */
 106         int bufw; /* pixmap width  */
 107         int bufh; /* pixmap height */
 108         int ch; /* char height */
 109         int cw; /* char width  */
 110 } XWindow;
 111
 112 typedef struct {
 113         KeySym k;
 114         char s[ESC_BUF_SIZ];
 115 } Key;
 116
 117 /* Drawing Context */
 118 typedef struct {
 119         unsigned long col[256];
 120         XFontStruct* font;
 121         XFontStruct* bfont;
 122         GC gc;
 123 } DC;
 124
 125 #include "config.h"
 126
 127 static void die(const char *errstr, ...);
 128 static void draw(int);
 129 static void execsh(void);
 130 static void sigchld(int);
 131 static void run(void);
 132
 133 static void csidump(void);
 134 static void csihandle(void);
 135 static void csiparse(void);
 136 static void csireset(void);
 137
 138 static void tclearregion(int, int, int, int);
 139 static void tcursor(int);
 140 static void tdeletechar(int);
 141 static void tdeleteline(int);
 142 static void tinsertblank(int);
 143 static void tinsertblankline(int);
 144 static void tmoveto(int, int);
 145 static void tnew(int, int);
 146 static void tnewline(void);
 147 static void tputtab(void);
 148 static void tputc(char);
 149 static void tputs(char*, int);
 150 static void treset(void);
 151 static void tresize(int, int);
 152 static void tscrollup(int);
 153 static void tscrolldown(int);
 154 static void tsetattr(int*, int);
 155 static void tsetchar(char);
 156 static void tsetscroll(int, int);
 157
 158 static void ttynew(void);
 159 static void ttyread(void);
 160 static void ttyresize(int, int);
 161 static void ttywrite(const char *, size_t);
 162
 163 static void xbell(void);
 164 static void xdraws(char *, Glyph, int, int, int);
 165 static void xhints(void);
 166 static void xclear(int, int, int, int);
 167 static void xcursor(int);
 168 static void xinit(void);
 169 static void xloadcols(void);
 170
 171 static void expose(XEvent *);
 172 static char* kmap(KeySym);
 173 static void kpress(XEvent *);
 174 static void resize(XEvent *);
 175
 176 static void (*handler[LASTEvent])(XEvent *) = {
 177         [KeyPress] = kpress,
 178         [Expose] = expose,
 179         [ConfigureNotify] = resize
 180 };
 181
 182 /* Globals */
 183 static DC dc;
 184 static XWindow xw;
 185 static Term term;
 186 static CSIEscape escseq;
 187 static int cmdfd;
 188 static pid_t pid;
 189 static int running;
 190
 191 #ifdef DEBUG
 192 void
 193 tdump(void) {
 194         int row, col;
 195         Glyph c;
 196
 197         for(row = 0; row < term.row; row++) {
 198                 for(col = 0; col < term.col; col++) {
 199                         if(col == term.c.x && row == term.c.y)
 200                                 putchar('#');
 201                         else {
 202                                 c = term.line[row][col];
 203                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 204                         }
 205                 }
 206                 putchar('\n');
 207         }
 208 }
 209 #endif
 210
 211 void
 212 die(const char *errstr, ...) {
 213         va_list ap;
 214
 215         va_start(ap, errstr);
 216         vfprintf(stderr, errstr, ap);
 217         va_end(ap);
 218         exit(EXIT_FAILURE);
 219 }
 220
 221 void
 222 execsh(void) {
 223         char *args[3] = {getenv("SHELL"), "-i", NULL};
 224         DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
 225         putenv("TERM=" TNAME);
 226         execvp(args[0], args);
 227 }
 228
 229 void
 230 xbell(void) { /* visual bell */
 231         XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
 232         XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
 233         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 234         /* usleep(30000); */
 235         draw(SCREEN_REDRAW);
 236 }
 237
 238 void
 239 sigchld(int a) {
 240         int stat = 0;
 241         if(waitpid(pid, &stat, 0) < 0)
 242                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 243         if(WIFEXITED(stat))
 244                 exit(WEXITSTATUS(stat));
 245         else
 246                 exit(EXIT_FAILURE);
 247 }
 248
 249 void
 250 ttynew(void) {
 251         int m, s;
 252
 253         /* seems to work fine on linux, openbsd and freebsd */
 254         struct winsize w = {term.row, term.col, 0, 0};
 255         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 256                 die("openpty failed: %s\n", SERRNO);
 257
 258         switch(pid = fork()) {
 259         case -1:
 260                 die("fork failed\n");
 261                 break;
 262         case 0:
 263                 setsid(); /* create a new process group */
 264                 dup2(s, STDIN_FILENO);
 265                 dup2(s, STDOUT_FILENO);
 266                 dup2(s, STDERR_FILENO);
 267                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 268                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 269                 close(s);
 270                 close(m);
 271                 execsh();
 272                 break;
 273         default:
 274                 close(s);
 275                 cmdfd = m;
 276                 signal(SIGCHLD, sigchld);
 277         }
 278 }
 279
 280 void
 281 dump(char c) {
 282         static int col;
 283         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 284         if(++col % 10 == 0)
 285                 fprintf(stderr, "\n");
 286 }
 287
 288 void
 289 ttyread(void) {
 290         char buf[BUFSIZ] = {0};
 291         int ret;
 292
 293         if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
 294                 die("Couldn't read from shell: %s\n", SERRNO);
 295         else
 296                 tputs(buf, ret);
 297 }
 298
 299 void
 300 ttywrite(const char *s, size_t n) {
 301         if(write(cmdfd, s, n) == -1)
 302                 die("write error on tty: %s\n", SERRNO);
 303 }
 304
 305 void
 306 ttyresize(int x, int y) {
 307         struct winsize w;
 308
 309         w.ws_row = term.row;
 310         w.ws_col = term.col;
 311         w.ws_xpixel = w.ws_ypixel = 0;
 312         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 313                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 314 }
 315
 316 void
 317 tcursor(int mode) {
 318         static TCursor c;
 319
 320         if(mode == CURSOR_SAVE)
 321                 c = term.c;
 322         else if(mode == CURSOR_LOAD)
 323                 term.c = c, tmoveto(c.x, c.y);
 324 }
 325
 326 void
 327 treset(void) {
 328         term.c.attr.mode = ATTR_NULL;
 329         term.c.attr.fg = DefaultFG;
 330         term.c.attr.bg = DefaultBG;
 331         term.c.x = term.c.y = 0;
 332         term.hidec = 0;
 333         term.top = 0, term.bot = term.row - 1;
 334         term.mode = MODE_WRAP;
 335         tclearregion(0, 0, term.col-1, term.row-1);
 336 }
 337
 338 void
 339 tnew(int col, int row) {
 340         /* 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 void
 358 tscrolldown (int n) {
 359         int i;
 360         Line temp;
 361
 362         LIMIT(n, 0, term.bot-term.top+1);
 363
 364         for(i = 0; i < n; i++)
 365                 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
 366
 367         for(i = term.bot; i >= term.top+n; i--) {
 368                 temp = term.line[i];
 369                 term.line[i] = term.line[i-n];
 370                 term.line[i-n] = temp;
 371         }
 372 }
 373
 374 void
 375 tscrollup (int n) {
 376         int i;
 377         Line temp;
 378         LIMIT(n, 0, term.bot-term.top+1);
 379
 380         for(i = 0; i < n; i++)
 381                 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
 382
 383          for(i = term.top; i <= term.bot-n; i++) {
 384                  temp = term.line[i];
 385                  term.line[i] = term.line[i+n];
 386                  term.line[i+n] = temp;
 387          }
 388 }
 389
 390 void
 391 tnewline(void) {
 392         int y = term.c.y + 1;
 393         if(y > term.bot)
 394                 tscrollup(1), y = term.bot;
 395         tmoveto(0, y);
 396 }
 397
 398 void
 399 csiparse(void) {
 400         /* int noarg = 1; */
 401         char *p = escseq.buf;
 402
 403         escseq.narg = 0;
 404         if(*p == '?')
 405                 escseq.priv = 1, p++;
 406
 407         while(p < escseq.buf+escseq.len) {
 408                 while(isdigit(*p)) {
 409                         escseq.arg[escseq.narg] *= 10;
 410                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 411                 }
 412                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 413                         escseq.narg++, p++;
 414                 else {
 415                         escseq.mode = *p;
 416                         escseq.narg++;
 417                         return;
 418                 }
 419         }
 420 }
 421
 422 void
 423 tmoveto(int x, int y) {
 424         term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
 425         term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
 426 }
 427
 428 void
 429 tsetchar(char c) {
 430         term.line[term.c.y][term.c.x] = term.c.attr;
 431         term.line[term.c.y][term.c.x].c = c;
 432         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 433 }
 434
 435 void
 436 tclearregion(int x1, int y1, int x2, int y2) {
 437         int y, temp;
 438
 439         if(x1 > x2)
 440                 temp = x1, x1 = x2, x2 = temp;
 441         if(y1 > y2)
 442                 temp = y1, y1 = y2, y2 = temp;
 443
 444         LIMIT(x1, 0, term.col-1);
 445         LIMIT(x2, 0, term.col-1);
 446         LIMIT(y1, 0, term.row-1);
 447         LIMIT(y2, 0, term.row-1);
 448
 449         for(y = y1; y <= y2; y++)
 450                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 451 }
 452
 453 void
 454 tdeletechar(int n) {
 455         int src = term.c.x + n;
 456         int dst = term.c.x;
 457         int size = term.col - src;
 458
 459         if(src >= term.col) {
 460                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 461                 return;
 462         }
 463         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 464         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 465 }
 466
 467 void
 468 tinsertblank(int n) {
 469         int src = term.c.x;
 470         int dst = src + n;
 471         int size = term.col - dst;
 472
 473         if(dst >= term.col) {
 474                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 475                 return;
 476         }
 477         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 478         tclearregion(src, term.c.y, dst - 1, term.c.y);
 479 }
 480
 481 void
 482 tinsertblankline(int n) {
 483         int i;
 484         Line blank;
 485         int bot = term.bot;
 486
 487         if(term.c.y > term.bot)
 488                 bot = term.row - 1;
 489         else if(term.c.y < term.top)
 490                 bot = term.top - 1;
 491         if(term.c.y + n >= bot) {
 492                 tclearregion(0, term.c.y, term.col-1, bot);
 493                 return;
 494         }
 495         for(i = bot; i >= term.c.y+n; i--) {
 496                 /* swap deleted line <-> blanked line */
 497                 blank = term.line[i];
 498                 term.line[i] = term.line[i-n];
 499                 term.line[i-n] = blank;
 500                 /* blank it */
 501                 memset(blank, 0, term.col * sizeof(Glyph));
 502         }
 503 }
 504
 505 void
 506 tdeleteline(int n) {
 507         int i;
 508         Line blank;
 509         int bot = term.bot;
 510
 511         if(term.c.y > term.bot)
 512                 bot = term.row - 1;
 513         else if(term.c.y < term.top)
 514                 bot = term.top - 1;
 515         if(term.c.y + n >= bot) {
 516                 tclearregion(0, term.c.y, term.col-1, bot);
 517                 return;
 518         }
 519         for(i = term.c.y; i <= bot-n; i++) {
 520                 /* swap deleted line <-> blanked line */
 521                 blank = term.line[i];
 522                 term.line[i] = term.line[i+n];
 523                 term.line[i+n] = blank;
 524                 /* blank it */
 525                 memset(blank, 0, term.col * sizeof(Glyph));
 526         }
 527 }
 528
 529 void
 530 tsetattr(int *attr, int l) {
 531         int i;
 532
 533         for(i = 0; i < l; i++) {
 534                 switch(attr[i]) {
 535                 case 0:
 536                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 537                         term.c.attr.fg = DefaultFG;
 538                         term.c.attr.bg = DefaultBG;
 539                         break;
 540                 case 1:
 541                         term.c.attr.mode |= ATTR_BOLD;
 542                         break;
 543                 case 4:
 544                         term.c.attr.mode |= ATTR_UNDERLINE;
 545                         break;
 546                 case 7:
 547                         term.c.attr.mode |= ATTR_REVERSE;
 548                         break;
 549                 case 22:
 550                         term.c.attr.mode &= ~ATTR_BOLD;
 551                         break;
 552                 case 24:
 553                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 554                         break;
 555                 case 27:
 556                         term.c.attr.mode &= ~ATTR_REVERSE;
 557                         break;
 558                 case 38:
 559                         if (i + 2 < l && attr[i + 1] == 5) {
 560                                 i += 2;
 561                                 if (BETWEEN(attr[i], 0, 255))
 562                                         term.c.attr.fg = attr[i];
 563                                 else
 564                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 565                         }
 566                         else
 567                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 568                         break;
 569                 case 39:
 570                         term.c.attr.fg = DefaultFG;
 571                         break;
 572                 case 48:
 573                         if (i + 2 < l && attr[i + 1] == 5) {
 574                                 i += 2;
 575                                 if (BETWEEN(attr[i], 0, 255))
 576                                         term.c.attr.bg = attr[i];
 577                                 else
 578                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 579                         }
 580                         else
 581                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 582                         break;
 583                 case 49:
 584                         term.c.attr.bg = DefaultBG;
 585                         break;
 586                 default:
 587                         if(BETWEEN(attr[i], 30, 37))
 588                                 term.c.attr.fg = attr[i] - 30;
 589                         else if(BETWEEN(attr[i], 40, 47))
 590                                 term.c.attr.bg = attr[i] - 40;
 591                         else if(BETWEEN(attr[i], 90, 97))
 592                                 term.c.attr.fg = attr[i] - 90 + 8;
 593                         else if(BETWEEN(attr[i], 100, 107))
 594                                 term.c.attr.fg = attr[i] - 100 + 8;
 595                         else
 596                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 597                         break;
 598                 }
 599         }
 600 }
 601
 602 void
 603 tsetscroll(int t, int b) {
 604         int temp;
 605
 606         LIMIT(t, 0, term.row-1);
 607         LIMIT(b, 0, term.row-1);
 608         if(t > b) {
 609                 temp = t;
 610                 t = b;
 611                 b = temp;
 612         }
 613         term.top = t;
 614         term.bot = b;
 615 }
 616
 617 void
 618 csihandle(void) {
 619         switch(escseq.mode) {
 620         default:
 621         unknown:
 622                 printf("erresc: unknown csi ");
 623                 csidump();
 624                 /* die(""); */
 625                 break;
 626         case '@': /* ICH -- Insert <n> blank char */
 627                 DEFAULT(escseq.arg[0], 1);
 628                 tinsertblank(escseq.arg[0]);
 629                 break;
 630         case 'A': /* CUU -- Cursor <n> Up */
 631         case 'e':
 632                 DEFAULT(escseq.arg[0], 1);
 633                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 634                 break;
 635         case 'B': /* CUD -- Cursor <n> Down */
 636                 DEFAULT(escseq.arg[0], 1);
 637                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 638                 break;
 639         case 'C': /* CUF -- Cursor <n> Forward */
 640         case 'a':
 641                 DEFAULT(escseq.arg[0], 1);
 642                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 643                 break;
 644         case 'D': /* CUB -- Cursor <n> Backward */
 645                 DEFAULT(escseq.arg[0], 1);
 646                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 647                 break;
 648         case 'E': /* CNL -- Cursor <n> Down and first col */
 649                 DEFAULT(escseq.arg[0], 1);
 650                 tmoveto(0, term.c.y+escseq.arg[0]);
 651                 break;
 652         case 'F': /* CPL -- Cursor <n> Up and first col */
 653                 DEFAULT(escseq.arg[0], 1);
 654                 tmoveto(0, term.c.y-escseq.arg[0]);
 655                 break;
 656         case 'G': /* CHA -- Move to <col> */
 657         case '`': /* XXX: HPA -- same? */
 658                 DEFAULT(escseq.arg[0], 1);
 659                 tmoveto(escseq.arg[0]-1, term.c.y);
 660                 break;
 661         case 'H': /* CUP -- Move to <row> <col> */
 662         case 'f': /* XXX: HVP -- same? */
 663                 DEFAULT(escseq.arg[0], 1);
 664                 DEFAULT(escseq.arg[1], 1);
 665                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 666                 break;
 667         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 668         case 'J': /* ED -- Clear screen */
 669                 switch(escseq.arg[0]) {
 670                 case 0: /* below */
 671                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 672                         break;
 673                 case 1: /* above */
 674                         tclearregion(0, 0, term.c.x, term.c.y);
 675                         break;
 676                 case 2: /* all */
 677                         tclearregion(0, 0, term.col-1, term.row-1);
 678                         break;
 679                 case 3: /* XXX: erase saved lines (xterm) */
 680                 default:
 681                         goto unknown;
 682                 }
 683                 break;
 684         case 'K': /* EL -- Clear line */
 685                 switch(escseq.arg[0]) {
 686                 case 0: /* right */
 687                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 688                         break;
 689                 case 1: /* left */
 690                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 691                         break;
 692                 case 2: /* all */
 693                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 694                         break;
 695                 }
 696                 break;
 697         case 'S': /* SU -- Scroll <n> line up */
 698                 DEFAULT(escseq.arg[0], 1);
 699                 tscrollup(escseq.arg[0]);
 700                 break;
 701         case 'T': /* SD -- Scroll <n> line down */
 702                 DEFAULT(escseq.arg[0], 1);
 703                 tscrolldown(escseq.arg[0]);
 704                 break;
 705         case 'L': /* IL -- Insert <n> blank lines */
 706                 DEFAULT(escseq.arg[0], 1);
 707                 tinsertblankline(escseq.arg[0]);
 708                 break;
 709         case 'l': /* RM -- Reset Mode */
 710                 if(escseq.priv) {
 711                         switch(escseq.arg[0]) {
 712                         case 1:
 713                                 term.mode &= ~MODE_APPKEYPAD;
 714                                 break;
 715                         case 7:
 716                                 term.mode &= ~MODE_WRAP;
 717                                 break;
 718                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 719                                 break;
 720                         case 25:
 721                                 term.hidec = 1;
 722                                 break;
 723                         case 1048: /* XXX: no alt. screen to erase/save */
 724                         case 1049:
 725                                 tcursor(CURSOR_LOAD);
 726                                 tclearregion(0, 0, term.col-1, term.row-1);
 727                                 break;
 728                         default:
 729                                 goto unknown;
 730                         }
 731                 } else {
 732                         switch(escseq.arg[0]) {
 733                         case 4:
 734                                 term.mode &= ~MODE_INSERT;
 735                                 break;
 736                         default:
 737                                 goto unknown;
 738                         }
 739                 }
 740                 break;
 741         case 'M': /* DL -- Delete <n> lines */
 742                 DEFAULT(escseq.arg[0], 1);
 743                 tdeleteline(escseq.arg[0]);
 744                 break;
 745         case 'X': /* ECH -- Erase <n> char */
 746                 DEFAULT(escseq.arg[0], 1);
 747                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 748                 break;
 749         case 'P': /* DCH -- Delete <n> char */
 750                 DEFAULT(escseq.arg[0], 1);
 751                 tdeletechar(escseq.arg[0]);
 752                 break;
 753         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 754         case 'd': /* VPA -- Move to <row> */
 755                 DEFAULT(escseq.arg[0], 1);
 756                 tmoveto(term.c.x, escseq.arg[0]-1);
 757                 break;
 758         case 'h': /* SM -- Set terminal mode */
 759                 if(escseq.priv) {
 760                         switch(escseq.arg[0]) {
 761                         case 1:
 762                                 term.mode |= MODE_APPKEYPAD;
 763                                 break;
 764                         case 7:
 765                                 term.mode |= MODE_WRAP;
 766                                 break;
 767                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 768                                 break;
 769                         case 25:
 770                                 term.hidec = 0;
 771                                 break;
 772                         case 1048:
 773                         case 1049: /* XXX: no alt. screen to erase/save */
 774                                 tcursor(CURSOR_SAVE);
 775                                 tclearregion(0, 0, term.col-1, term.row-1);
 776                                 break;
 777                         default: goto unknown;
 778                         }
 779                 } else {
 780                         switch(escseq.arg[0]) {
 781                         case 4:
 782                                 term.mode |= MODE_INSERT;
 783                                 break;
 784                         default: goto unknown;
 785                         }
 786                 };
 787                 break;
 788         case 'm': /* SGR -- Terminal attribute (color) */
 789                 tsetattr(escseq.arg, escseq.narg);
 790                 break;
 791         case 'r': /* DECSTBM -- Set Scrolling Region */
 792                 if(escseq.priv)
 793                         goto unknown;
 794                 else {
 795                         DEFAULT(escseq.arg[0], 1);
 796                         DEFAULT(escseq.arg[1], term.row);
 797                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 798                 }
 799                 break;
 800         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 801                 tcursor(CURSOR_SAVE);
 802                 break;
 803         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 804                 tcursor(CURSOR_LOAD);
 805                 break;
 806         }
 807 }
 808
 809 void
 810 csidump(void) {
 811         int i;
 812         printf("ESC [ %s", escseq.priv ? "? " : "");
 813         if(escseq.narg)
 814                 for(i = 0; i < escseq.narg; i++)
 815                         printf("%d ", escseq.arg[i]);
 816         if(escseq.mode)
 817                 putchar(escseq.mode);
 818         putchar('\n');
 819 }
 820
 821 void
 822 csireset(void) {
 823         memset(&escseq, 0, sizeof(escseq));
 824 }
 825
 826 void
 827 tputtab(void) {
 828         int space = TAB - term.c.x % TAB;
 829         tmoveto(term.c.x + space, term.c.y);
 830 }
 831
 832 void
 833 tputc(char c) {
 834         if(term.esc & ESC_START) {
 835                 if(term.esc & ESC_CSI) {
 836                         escseq.buf[escseq.len++] = c;
 837                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 838                                 term.esc = 0;
 839                                 csiparse(), csihandle();
 840                         }
 841                 } else if(term.esc & ESC_OSC) {
 842                         if(c == ';') {
 843                                 term.titlelen = 0;
 844                                 term.esc = ESC_START | ESC_TITLE;
 845                         }
 846                 } else if(term.esc & ESC_TITLE) {
 847                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 848                                 term.esc = 0;
 849                                 term.title[term.titlelen] = '\0';
 850                                 XStoreName(xw.dis, xw.win, term.title);
 851                         } else {
 852                                 term.title[term.titlelen++] = c;
 853                         }
 854                 } else if(term.esc & ESC_ALTCHARSET) {
 855                         switch(c) {
 856                         case '0': /* Line drawing crap */
 857                                 term.c.attr.mode |= ATTR_GFX;
 858                                 break;
 859                         case 'B': /* Back to regular text */
 860                                 term.c.attr.mode &= ~ATTR_GFX;
 861                                 break;
 862                         default:
 863                                 printf("esc unhandled charset: ESC ( %c\n", c);
 864                         }
 865                         term.esc = 0;
 866                 } else {
 867                         switch(c) {
 868                         case '[':
 869                                 term.esc |= ESC_CSI;
 870                                 break;
 871                         case ']':
 872                                 term.esc |= ESC_OSC;
 873                                 break;
 874                         case '(':
 875                                 term.esc |= ESC_ALTCHARSET;
 876                                 break;
 877                         case 'A':
 878                                 tmoveto(term.c.x, term.c.y-1);
 879                                 term.esc = 0;
 880                                 break;
 881                         case 'B':
 882                                 tmoveto(term.c.x, term.c.y+1);
 883                                 term.esc = 0;
 884                                 break;
 885                         case 'C':
 886                                 tmoveto(term.c.x+1, term.c.y);
 887                                 term.esc = 0;
 888                                 break;
 889                         case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
 890                                 tmoveto(term.c.x-1, term.c.y);
 891                                 term.esc = 0;
 892                                 break;
 893                         case 'E': /* NEL -- Next line */
 894                                 tnewline();
 895                                 term.esc = 0;
 896                                 break;
 897                         case 'M': /* RI -- Reverse index */
 898                                 if(term.c.y == term.top)
 899                                         tscrolldown(1);
 900                                 else
 901                                         tmoveto(term.c.x, term.c.y-1);
 902                                 term.esc = 0;
 903                                 break;
 904                         case 'c': /* RIS -- Reset to inital state */
 905                                 treset();
 906                                 term.esc = 0;
 907                                 break;
 908                         case '=': /* DECPAM */
 909                                 term.mode |= MODE_APPKEYPAD;
 910                                 term.esc = 0;
 911                                 break;
 912                         case '>': /* DECPNM */
 913                                 term.mode &= ~MODE_APPKEYPAD;
 914                                 term.esc = 0;
 915                                 break;
 916                         case '7':
 917                                 tcursor(CURSOR_SAVE);
 918                                 term.esc = 0;
 919                                 break;
 920                         case '8':
 921                                 tcursor(CURSOR_LOAD);
 922                                 term.esc = 0;
 923                                 break;
 924                         default:
 925                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
 926                                 term.esc = 0;
 927                         }
 928                 }
 929         } else {
 930                 switch(c) {
 931                 case '\t':
 932                         tputtab();
 933                         break;
 934                 case '\b':
 935                         tmoveto(term.c.x-1, term.c.y);
 936                         break;
 937                 case '\r':
 938                         tmoveto(0, term.c.y);
 939                         break;
 940                 case '\n':
 941                         tnewline();
 942                         break;
 943                 case '\a':
 944                         xbell();
 945                         break;
 946                 case '\033':
 947                         csireset();
 948                         term.esc = ESC_START;
 949                         break;
 950                 default:
 951                         tsetchar(c);
 952                         if(term.c.x+1 < term.col) {
 953                                 tmoveto(term.c.x+1, term.c.y);
 954                         } else if(IS_SET(MODE_WRAP))
 955                                 tnewline();
 956                         break;
 957                 }
 958         }
 959 }
 960
 961 void
 962 tputs(char *s, int len) {
 963         for(; len > 0; len--)
 964                 tputc(*s++);
 965 }
 966
 967 void
 968 tresize(int col, int row) {
 969         int i;
 970         int minrow = MIN(row, term.row);
 971         int mincol = MIN(col, term.col);
 972
 973         if(col < 1 || row < 1)
 974                 return;
 975
 976         /* free uneeded rows */
 977         for(i = row; i < term.row; i++)
 978                 free(term.line[i]);
 979
 980         /* resize to new height */
 981         term.line = realloc(term.line, row * sizeof(Line));
 982
 983         /* resize each row to new width, zero-pad if needed */
 984         for(i = 0; i < minrow; i++) {
 985                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
 986                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
 987         }
 988
 989         /* allocate any new rows */
 990         for(/* i == minrow */; i < row; i++)
 991                 term.line[i] = calloc(col, sizeof(Glyph));
 992
 993         LIMIT(term.c.x, 0, col-1);
 994         LIMIT(term.c.y, 0, row-1);
 995         LIMIT(term.top, 0, row-1);
 996         LIMIT(term.bot, 0, row-1);
 997
 998         term.bot = row-1;
 999         term.col = col, term.row = row;
1000 }
1001
1002 void
1003 xloadcols(void) {
1004         int i, r, g, b;
1005         XColor color;
1006         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1007         unsigned long white = WhitePixel(xw.dis, xw.scr);
1008
1009         for(i = 0; i < 16; i++) {
1010                 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1011                         dc.col[i] = white;
1012                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1013                 } else
1014                         dc.col[i] = color.pixel;
1015         }
1016
1017         /* same colors as xterm */
1018         for(r = 0; r < 6; r++)
1019                 for(g = 0; g < 6; g++)
1020                         for(b = 0; b < 6; b++) {
1021                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1022                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1023                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1024                                 if (!XAllocColor(xw.dis, cmap, &color)) {
1025                                         dc.col[i] = white;
1026                                         fprintf(stderr, "Could not allocate color %d\n", i);
1027                                 } else
1028                                         dc.col[i] = color.pixel;
1029                                 i++;
1030                         }
1031
1032         for(r = 0; r < 24; r++, i++) {
1033                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1034                 if (!XAllocColor(xw.dis, cmap, &color)) {
1035                         dc.col[i] = white;
1036                         fprintf(stderr, "Could not allocate color %d\n", i);
1037                 } else
1038                         dc.col[i] = color.pixel;
1039         }
1040 }
1041
1042 void
1043 xclear(int x1, int y1, int x2, int y2) {
1044         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1045         XFillRectangle(xw.dis, xw.buf, dc.gc,
1046                        x1 * xw.cw, y1 * xw.ch,
1047                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1048 }
1049
1050 void
1051 xhints(void)
1052 {
1053         XClassHint class = {TNAME, TNAME};
1054         XWMHints wm = {.flags = InputHint, .input = 1};
1055         XSizeHints size = {
1056                 .flags = PSize | PResizeInc | PBaseSize,
1057                 .height = xw.h,
1058                 .width = xw.w,
1059                 .height_inc = xw.ch,
1060                 .width_inc = xw.cw,
1061                 .base_height = 2*BORDER,
1062                 .base_width = 2*BORDER,
1063         };
1064         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1065 }
1066
1067 void
1068 xinit(void) {
1069         if(!(xw.dis = XOpenDisplay(NULL)))
1070                 die("Can't open display\n");
1071         xw.scr = XDefaultScreen(xw.dis);
1072
1073         /* font */
1074         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1075                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1076
1077         /* XXX: Assuming same size for bold font */
1078         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1079         xw.ch = dc.font->ascent + dc.font->descent;
1080
1081         /* colors */
1082         xloadcols();
1083
1084         term.c.attr.fg = DefaultFG;
1085         term.c.attr.bg = DefaultBG;
1086         term.c.attr.mode = ATTR_NULL;
1087         /* windows */
1088         xw.h = term.row * xw.ch + 2*BORDER;
1089         xw.w = term.col * xw.cw + 2*BORDER;
1090         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1091                         xw.w, xw.h, 0,
1092                         dc.col[DefaultBG],
1093                         dc.col[DefaultBG]);
1094         xw.bufw = xw.w - 2*BORDER;
1095         xw.bufh = xw.h - 2*BORDER;
1096         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1097         /* gc */
1098         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1099         XMapWindow(xw.dis, xw.win);
1100         xhints();
1101         XStoreName(xw.dis, xw.win, "st");
1102         XSync(xw.dis, 0);
1103 }
1104
1105 void
1106 xdraws(char *s, Glyph base, int x, int y, int len) {
1107         unsigned long xfg, xbg;
1108         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1109         int i;
1110
1111         if(base.mode & ATTR_REVERSE)
1112                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1113         else
1114                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1115
1116         XSetBackground(xw.dis, dc.gc, xbg);
1117         XSetForeground(xw.dis, dc.gc, xfg);
1118
1119         if(base.mode & ATTR_GFX)
1120                 for(i = 0; i < len; i++)
1121                         s[i] = gfx[(int)s[i]];
1122
1123         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1124         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1125
1126         if(base.mode & ATTR_UNDERLINE)
1127                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1128 }
1129
1130 void
1131 xcursor(int mode) {
1132         static int oldx = 0;
1133         static int oldy = 0;
1134         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1135
1136         LIMIT(oldx, 0, term.col-1);
1137         LIMIT(oldy, 0, term.row-1);
1138
1139         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1140                 g.c = term.line[term.c.y][term.c.x].c;
1141
1142         /* remove the old cursor */
1143         if(term.line[oldy][oldx].state & GLYPH_SET)
1144                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1145         else
1146                 xclear(oldx, oldy, oldx, oldy);
1147
1148         /* draw the new one */
1149         if(mode == CURSOR_DRAW) {
1150                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1151                 oldx = term.c.x, oldy = term.c.y;
1152         }
1153 }
1154
1155 #ifdef DEBUG
1156 /* basic drawing routines */
1157 void
1158 xdrawc(int x, int y, Glyph g) {
1159         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1160         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1161         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1162         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1163         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1164 }
1165
1166 void
1167 draw(int dummy) {
1168         int x, y;
1169
1170         xclear(0, 0, term.col-1, term.row-1);
1171         for(y = 0; y < term.row; y++)
1172                 for(x = 0; x < term.col; x++)
1173                         if(term.line[y][x].state & GLYPH_SET)
1174                                 xdrawc(x, y, term.line[y][x]);
1175
1176         if(!term.hidec)
1177                 xcursor(CURSOR_DRAW);
1178         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1179         XFlush(xw.dis);
1180 }
1181
1182 #else
1183 /* optimized drawing routine */
1184 void
1185 draw(int redraw_all) {
1186         int i, x, y, ox;
1187         Glyph base, new;
1188         char buf[DRAW_BUF_SIZ];
1189
1190         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1191         XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1192         for(y = 0; y < term.row; y++) {
1193                 base = term.line[y][0];
1194                 i = ox = 0;
1195                 for(x = 0; x < term.col; x++) {
1196                         new = term.line[y][x];
1197                         if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1198                                 buf[i++] = new.c;
1199                         else {
1200                                 xdraws(buf, base, ox, y, i);
1201                                 buf[0] = new.c;
1202                                 i = 1;
1203                                 ox = x;
1204                                 base = new;
1205                         }
1206                 }
1207                 xdraws(buf, base, ox, y, i);
1208         }
1209         xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1210         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1211         XFlush(xw.dis);
1212 }
1213
1214 #endif
1215
1216 void
1217 expose(XEvent *ev) {
1218         draw(SCREEN_REDRAW);
1219 }
1220
1221 char*
1222 kmap(KeySym k) {
1223         int i;
1224         for(i = 0; i < LEN(key); i++)
1225                 if(key[i].k == k)
1226                         return (char*)key[i].s;
1227         return NULL;
1228 }
1229
1230 void
1231 kpress(XEvent *ev) {
1232         XKeyEvent *e = &ev->xkey;
1233         KeySym ksym;
1234         char buf[32];
1235         char *customkey;
1236         int len;
1237         int meta;
1238         int shift;
1239
1240         meta = e->state & Mod1Mask;
1241         shift = e->state & ShiftMask;
1242         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1243
1244         if((customkey = kmap(ksym)))
1245                 ttywrite(customkey, strlen(customkey));
1246         else if(len > 0) {
1247                 buf[sizeof(buf)-1] = '\0';
1248                 if(meta && len == 1)
1249                         ttywrite("\033", 1);
1250                 ttywrite(buf, len);
1251         } else
1252                 switch(ksym) {
1253                 case XK_Up:
1254                 case XK_Down:
1255                 case XK_Left:
1256                 case XK_Right:
1257                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1258                         ttywrite(buf, 3);
1259                         break;
1260                 case XK_Insert:
1261                         if(shift)
1262                                 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1263                         break;
1264                 default:
1265                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1266                         break;
1267                 }
1268 }
1269
1270 void
1271 resize(XEvent *e) {
1272         int col, row;
1273
1274         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1275                 return;
1276
1277         xw.w = e->xconfigure.width;
1278         xw.h = e->xconfigure.height;
1279         xw.bufw = xw.w - 2*BORDER;
1280         xw.bufh = xw.h - 2*BORDER;
1281         col = xw.bufw / xw.cw;
1282         row = xw.bufh / xw.ch;
1283         tresize(col, row);
1284         ttyresize(col, row);
1285         XFreePixmap(xw.dis, xw.buf);
1286         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1287         draw(SCREEN_REDRAW);
1288 }
1289
1290 void
1291 run(void) {
1292         XEvent ev;
1293         fd_set rfd;
1294         int xfd = XConnectionNumber(xw.dis);
1295
1296         running = 1;
1297         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1298         XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1299
1300         while(running) {
1301                 FD_ZERO(&rfd);
1302                 FD_SET(cmdfd, &rfd);
1303                 FD_SET(xfd, &rfd);
1304                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1305                         if(errno == EINTR)
1306                                 continue;
1307                         die("select failed: %s\n", SERRNO);
1308                 }
1309                 if(FD_ISSET(cmdfd, &rfd)) {
1310                         ttyread();
1311                         draw(SCREEN_UPDATE);
1312                 }
1313                 while(XPending(xw.dis)) {
1314                         XNextEvent(xw.dis, &ev);
1315                         if(handler[ev.type])
1316                                 (handler[ev.type])(&ev);
1317                 }
1318         }
1319 }
1320
1321 int
1322 main(int argc, char *argv[]) {
1323         if(argc == 2 && !strncmp("-v", argv[1], 3))
1324                 die("st-" VERSION ", (c) 2010 st engineers\n");
1325         else if(argc != 1)
1326                 die("usage: st [-v]\n");
1327         setlocale(LC_CTYPE, "");
1328         tnew(80, 24);
1329         ttynew();
1330         xinit();
1331         run();
1332         return 0;
1333 }