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 tscroll(void);
 153 static void tscrollup(int);
 154 static void tscrolldown(int);
 155 static void tsetattr(int*, int);
 156 static void tsetchar(char);
 157 static void tsetscroll(int, int);
 158
 159 static void ttynew(void);
 160 static void ttyread(void);
 161 static void ttyresize(int, int);
 162 static void ttywrite(const char *, size_t);
 163
 164 static void xbell(void);
 165 static void xdraws(char *, Glyph, int, int, int);
 166 static void xhints(void);
 167 static void xclear(int, int, int, int);
 168 static void xcursor(int);
 169 static void xinit(void);
 170 static void xloadcols(void);
 171
 172 static void expose(XEvent *);
 173 static char* kmap(KeySym);
 174 static void kpress(XEvent *);
 175 static void resize(XEvent *);
 176
 177 static void (*handler[LASTEvent])(XEvent *) = {
 178         [KeyPress] = kpress,
 179         [Expose] = expose,
 180         [ConfigureNotify] = resize
 181 };
 182
 183 /* Globals */
 184 static DC dc;
 185 static XWindow xw;
 186 static Term term;
 187 static CSIEscape escseq;
 188 static int cmdfd;
 189 static pid_t pid;
 190 static int running;
 191
 192 #ifdef DEBUG
 193 void
 194 tdump(void) {
 195         int row, col;
 196         Glyph c;
 197
 198         for(row = 0; row < term.row; row++) {
 199                 for(col = 0; col < term.col; col++) {
 200                         if(col == term.c.x && row == term.c.y)
 201                                 putchar('#');
 202                         else {
 203                                 c = term.line[row][col];
 204                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 205                         }
 206                 }
 207                 putchar('\n');
 208         }
 209 }
 210 #endif
 211
 212 void
 213 die(const char *errstr, ...) {
 214         va_list ap;
 215
 216         va_start(ap, errstr);
 217         vfprintf(stderr, errstr, ap);
 218         va_end(ap);
 219         exit(EXIT_FAILURE);
 220 }
 221
 222 void
 223 execsh(void) {
 224         char *args[3] = {getenv("SHELL"), "-i", NULL};
 225         DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
 226         putenv("TERM=" TNAME);
 227         execvp(args[0], args);
 228 }
 229
 230 void
 231 xbell(void) { /* visual bell */
 232         XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
 233         XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
 234         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 235         /* usleep(30000); */
 236         draw(SCREEN_REDRAW);
 237 }
 238
 239 void
 240 sigchld(int a) {
 241         int stat = 0;
 242         if(waitpid(pid, &stat, 0) < 0)
 243                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 244         if(WIFEXITED(stat))
 245                 exit(WEXITSTATUS(stat));
 246         else
 247                 exit(EXIT_FAILURE);
 248 }
 249
 250 void
 251 ttynew(void) {
 252         int m, s;
 253
 254         /* seems to work fine on linux, openbsd and freebsd */
 255         struct winsize w = {term.row, term.col, 0, 0};
 256         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 257                 die("openpty failed: %s\n", SERRNO);
 258
 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) {
 341         /* screen size */
 342         term.row = row, term.col = col;
 343         term.top = 0, term.bot = term.row - 1;
 344         /* mode */
 345         term.mode = MODE_WRAP;
 346         /* cursor */
 347         term.c.attr.mode = ATTR_NULL;
 348         term.c.attr.fg = DefaultFG;
 349         term.c.attr.bg = DefaultBG;
 350         term.c.x = term.c.y = 0;
 351         term.hidec = 0;
 352         /* allocate screen */
 353         term.line = calloc(term.row, sizeof(Line));
 354         for(row = 0 ; row < term.row; row++)
 355                 term.line[row] = calloc(term.col, sizeof(Glyph));
 356 }
 357
 358 /* TODO: Replace with scrollup/scolldown */
 359 void
 360 tscroll(void) {
 361         Line temp = term.line[term.top];
 362         int i;
 363
 364         for(i = term.top; i < term.bot; i++)
 365                 term.line[i] = term.line[i+1];
 366         memset(temp, 0, sizeof(Glyph) * term.col);
 367         term.line[term.bot] = temp;
 368 }
 369
 370 void
 371 tscrolldown (int n) {
 372         int i;
 373         Line temp;
 374
 375         LIMIT(n, 0, term.bot-term.top+1);
 376
 377         for(i = 0; i < n; i++)
 378                 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
 379
 380         for(i = term.bot; i >= term.top+n; i--) {
 381                 temp = term.line[i];
 382                 term.line[i] = term.line[i-n];
 383                 term.line[i-n] = temp;
 384         }
 385 }
 386
 387 void
 388 tscrollup (int n) {
 389         int i;
 390         Line temp;
 391         LIMIT(n, 0, term.bot-term.top+1);
 392
 393         for(i = 0; i < n; i++)
 394                 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
 395
 396          for(i = term.top; i <= term.bot-n; i++) {
 397                  temp = term.line[i];
 398                  term.line[i] = term.line[i+n];
 399                  term.line[i+n] = temp;
 400          }
 401 }
 402
 403 void
 404 tnewline(void) {
 405         int y = term.c.y + 1;
 406         if(y > term.bot)
 407                 tscroll(), y = term.bot;
 408         tmoveto(0, y);
 409 }
 410
 411 void
 412 csiparse(void) {
 413         /* int noarg = 1; */
 414         char *p = escseq.buf;
 415
 416         escseq.narg = 0;
 417         if(*p == '?')
 418                 escseq.priv = 1, p++;
 419
 420         while(p < escseq.buf+escseq.len) {
 421                 while(isdigit(*p)) {
 422                         escseq.arg[escseq.narg] *= 10;
 423                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 424                 }
 425                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 426                         escseq.narg++, p++;
 427                 else {
 428                         escseq.mode = *p;
 429                         escseq.narg++;
 430                         return;
 431                 }
 432         }
 433 }
 434
 435 void
 436 tmoveto(int x, int y) {
 437         term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
 438         term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
 439 }
 440
 441 void
 442 tsetchar(char c) {
 443         term.line[term.c.y][term.c.x] = term.c.attr;
 444         term.line[term.c.y][term.c.x].c = c;
 445         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 446 }
 447
 448 void
 449 tclearregion(int x1, int y1, int x2, int y2) {
 450         int y, temp;
 451
 452         if(x1 > x2)
 453                 temp = x1, x1 = x2, x2 = temp;
 454         if(y1 > y2)
 455                 temp = y1, y1 = y2, y2 = temp;
 456
 457         LIMIT(x1, 0, term.col-1);
 458         LIMIT(x2, 0, term.col-1);
 459         LIMIT(y1, 0, term.row-1);
 460         LIMIT(y2, 0, term.row-1);
 461
 462         for(y = y1; y <= y2; y++)
 463                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 464 }
 465
 466 void
 467 tdeletechar(int n) {
 468         int src = term.c.x + n;
 469         int dst = term.c.x;
 470         int size = term.col - src;
 471
 472         if(src >= term.col) {
 473                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 474                 return;
 475         }
 476         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 477         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 478 }
 479
 480 void
 481 tinsertblank(int n) {
 482         int src = term.c.x;
 483         int dst = src + n;
 484         int size = term.col - dst;
 485
 486         if(dst >= term.col) {
 487                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 488                 return;
 489         }
 490         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 491         tclearregion(src, term.c.y, dst - 1, term.c.y);
 492 }
 493
 494 void
 495 tinsertblankline(int n) {
 496         int i;
 497         Line blank;
 498         int bot = term.bot;
 499
 500         if(term.c.y > term.bot)
 501                 bot = term.row - 1;
 502         else if(term.c.y < term.top)
 503                 bot = term.top - 1;
 504         if(term.c.y + n >= bot) {
 505                 tclearregion(0, term.c.y, term.col-1, bot);
 506                 return;
 507         }
 508         for(i = bot; i >= term.c.y+n; i--) {
 509                 /* swap deleted line <-> blanked line */
 510                 blank = term.line[i];
 511                 term.line[i] = term.line[i-n];
 512                 term.line[i-n] = blank;
 513                 /* blank it */
 514                 memset(blank, 0, term.col * sizeof(Glyph));
 515         }
 516 }
 517
 518 void
 519 tdeleteline(int n) {
 520         int i;
 521         Line blank;
 522         int bot = term.bot;
 523
 524         if(term.c.y > term.bot)
 525                 bot = term.row - 1;
 526         else if(term.c.y < term.top)
 527                 bot = term.top - 1;
 528         if(term.c.y + n >= bot) {
 529                 tclearregion(0, term.c.y, term.col-1, bot);
 530                 return;
 531         }
 532         for(i = term.c.y; i <= bot-n; i++) {
 533                 /* swap deleted line <-> blanked line */
 534                 blank = term.line[i];
 535                 term.line[i] = term.line[i+n];
 536                 term.line[i+n] = blank;
 537                 /* blank it */
 538                 memset(blank, 0, term.col * sizeof(Glyph));
 539         }
 540 }
 541
 542 void
 543 tsetattr(int *attr, int l) {
 544         int i;
 545
 546         for(i = 0; i < l; i++) {
 547                 switch(attr[i]) {
 548                 case 0:
 549                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 550                         term.c.attr.fg = DefaultFG;
 551                         term.c.attr.bg = DefaultBG;
 552                         break;
 553                 case 1:
 554                         term.c.attr.mode |= ATTR_BOLD;
 555                         break;
 556                 case 4:
 557                         term.c.attr.mode |= ATTR_UNDERLINE;
 558                         break;
 559                 case 7:
 560                         term.c.attr.mode |= ATTR_REVERSE;
 561                         break;
 562                 case 22:
 563                         term.c.attr.mode &= ~ATTR_BOLD;
 564                         break;
 565                 case 24:
 566                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 567                         break;
 568                 case 27:
 569                         term.c.attr.mode &= ~ATTR_REVERSE;
 570                         break;
 571                 case 38:
 572                         if (i + 2 < l && attr[i + 1] == 5) {
 573                                 i += 2;
 574                                 if (BETWEEN(attr[i], 0, 255))
 575                                         term.c.attr.fg = attr[i];
 576                                 else
 577                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 578                         }
 579                         else
 580                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 581                         break;
 582                 case 39:
 583                         term.c.attr.fg = DefaultFG;
 584                         break;
 585                 case 48:
 586                         if (i + 2 < l && attr[i + 1] == 5) {
 587                                 i += 2;
 588                                 if (BETWEEN(attr[i], 0, 255))
 589                                         term.c.attr.bg = attr[i];
 590                                 else
 591                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 592                         }
 593                         else
 594                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 595                         break;
 596                 case 49:
 597                         term.c.attr.bg = DefaultBG;
 598                         break;
 599                 default:
 600                         if(BETWEEN(attr[i], 30, 37))
 601                                 term.c.attr.fg = attr[i] - 30;
 602                         else if(BETWEEN(attr[i], 40, 47))
 603                                 term.c.attr.bg = attr[i] - 40;
 604                         else if(BETWEEN(attr[i], 90, 97))
 605                                 term.c.attr.fg = attr[i] - 90 + 8;
 606                         else if(BETWEEN(attr[i], 100, 107))
 607                                 term.c.attr.fg = attr[i] - 100 + 8;
 608                         else
 609                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 610                         break;
 611                 }
 612         }
 613 }
 614
 615 void
 616 tsetscroll(int t, int b) {
 617         int temp;
 618
 619         LIMIT(t, 0, term.row-1);
 620         LIMIT(b, 0, term.row-1);
 621         if(t > b) {
 622                 temp = t;
 623                 t = b;
 624                 b = temp;
 625         }
 626         term.top = t;
 627         term.bot = b;
 628 }
 629
 630 void
 631 csihandle(void) {
 632         switch(escseq.mode) {
 633         default:
 634         unknown:
 635                 printf("erresc: unknown csi ");
 636                 csidump();
 637                 /* die(""); */
 638                 break;
 639         case '@': /* ICH -- Insert <n> blank char */
 640                 DEFAULT(escseq.arg[0], 1);
 641                 tinsertblank(escseq.arg[0]);
 642                 break;
 643         case 'A': /* CUU -- Cursor <n> Up */
 644         case 'e':
 645                 DEFAULT(escseq.arg[0], 1);
 646                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 647                 break;
 648         case 'B': /* CUD -- Cursor <n> Down */
 649                 DEFAULT(escseq.arg[0], 1);
 650                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 651                 break;
 652         case 'C': /* CUF -- Cursor <n> Forward */
 653         case 'a':
 654                 DEFAULT(escseq.arg[0], 1);
 655                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 656                 break;
 657         case 'D': /* CUB -- Cursor <n> Backward */
 658                 DEFAULT(escseq.arg[0], 1);
 659                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 660                 break;
 661         case 'E': /* CNL -- Cursor <n> Down and first col */
 662                 DEFAULT(escseq.arg[0], 1);
 663                 tmoveto(0, term.c.y+escseq.arg[0]);
 664                 break;
 665         case 'F': /* CPL -- Cursor <n> Up and first col */
 666                 DEFAULT(escseq.arg[0], 1);
 667                 tmoveto(0, term.c.y-escseq.arg[0]);
 668                 break;
 669         case 'G': /* CHA -- Move to <col> */
 670         case '`': /* XXX: HPA -- same? */
 671                 DEFAULT(escseq.arg[0], 1);
 672                 tmoveto(escseq.arg[0]-1, term.c.y);
 673                 break;
 674         case 'H': /* CUP -- Move to <row> <col> */
 675         case 'f': /* XXX: HVP -- same? */
 676                 DEFAULT(escseq.arg[0], 1);
 677                 DEFAULT(escseq.arg[1], 1);
 678                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 679                 break;
 680         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 681         case 'J': /* ED -- Clear screen */
 682                 switch(escseq.arg[0]) {
 683                 case 0: /* below */
 684                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 685                         break;
 686                 case 1: /* above */
 687                         tclearregion(0, 0, term.c.x, term.c.y);
 688                         break;
 689                 case 2: /* all */
 690                         tclearregion(0, 0, term.col-1, term.row-1);
 691                         break;
 692                 case 3: /* XXX: erase saved lines (xterm) */
 693                 default:
 694                         goto unknown;
 695                 }
 696                 break;
 697         case 'K': /* EL -- Clear line */
 698                 switch(escseq.arg[0]) {
 699                 case 0: /* right */
 700                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 701                         break;
 702                 case 1: /* left */
 703                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 704                         break;
 705                 case 2: /* all */
 706                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 707                         break;
 708                 }
 709                 break;
 710         case 'S': /* SU -- Scroll <n> line up */
 711                 DEFAULT(escseq.arg[0], 1);
 712                 tscrollup(escseq.arg[0]);
 713                 break;
 714         case 'T': /* SD -- Scroll <n> line down */
 715                 DEFAULT(escseq.arg[0], 1);
 716                 tscrolldown(escseq.arg[0]);
 717                 break;
 718         case 'L': /* IL -- Insert <n> blank lines */
 719                 DEFAULT(escseq.arg[0], 1);
 720                 tinsertblankline(escseq.arg[0]);
 721                 break;
 722         case 'l': /* RM -- Reset Mode */
 723                 if(escseq.priv) {
 724                         switch(escseq.arg[0]) {
 725                         case 1:
 726                                 term.mode &= ~MODE_APPKEYPAD;
 727                                 break;
 728                         case 7:
 729                                 term.mode &= ~MODE_WRAP;
 730                                 break;
 731                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 732                                 break;
 733                         case 25:
 734                                 term.hidec = 1;
 735                                 break;
 736                         case 1048: /* XXX: no alt. screen to erase/save */
 737                         case 1049:
 738                                 tcursor(CURSOR_LOAD);
 739                                 tclearregion(0, 0, term.col-1, term.row-1);
 740                                 break;
 741                         default:
 742                                 goto unknown;
 743                         }
 744                 } else {
 745                         switch(escseq.arg[0]) {
 746                         case 4:
 747                                 term.mode &= ~MODE_INSERT;
 748                                 break;
 749                         default:
 750                                 goto unknown;
 751                         }
 752                 }
 753                 break;
 754         case 'M': /* DL -- Delete <n> lines */
 755                 DEFAULT(escseq.arg[0], 1);
 756                 tdeleteline(escseq.arg[0]);
 757                 break;
 758         case 'X': /* ECH -- Erase <n> char */
 759                 DEFAULT(escseq.arg[0], 1);
 760                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 761                 break;
 762         case 'P': /* DCH -- Delete <n> char */
 763                 DEFAULT(escseq.arg[0], 1);
 764                 tdeletechar(escseq.arg[0]);
 765                 break;
 766         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 767         case 'd': /* VPA -- Move to <row> */
 768                 DEFAULT(escseq.arg[0], 1);
 769                 tmoveto(term.c.x, escseq.arg[0]-1);
 770                 break;
 771         case 'h': /* SM -- Set terminal mode */
 772                 if(escseq.priv) {
 773                         switch(escseq.arg[0]) {
 774                         case 1:
 775                                 term.mode |= MODE_APPKEYPAD;
 776                                 break;
 777                         case 7:
 778                                 term.mode |= MODE_WRAP;
 779                                 break;
 780                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 781                                 break;
 782                         case 25:
 783                                 term.hidec = 0;
 784                                 break;
 785                         case 1048:
 786                         case 1049: /* XXX: no alt. screen to erase/save */
 787                                 tcursor(CURSOR_SAVE);
 788                                 tclearregion(0, 0, term.col-1, term.row-1);
 789                                 break;
 790                         default: goto unknown;
 791                         }
 792                 } else {
 793                         switch(escseq.arg[0]) {
 794                         case 4:
 795                                 term.mode |= MODE_INSERT;
 796                                 break;
 797                         default: goto unknown;
 798                         }
 799                 };
 800                 break;
 801         case 'm': /* SGR -- Terminal attribute (color) */
 802                 tsetattr(escseq.arg, escseq.narg);
 803                 break;
 804         case 'r': /* DECSTBM -- Set Scrolling Region */
 805                 if(escseq.priv)
 806                         goto unknown;
 807                 else {
 808                         DEFAULT(escseq.arg[0], 1);
 809                         DEFAULT(escseq.arg[1], term.row);
 810                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 811                 }
 812                 break;
 813         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 814                 tcursor(CURSOR_SAVE);
 815                 break;
 816         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 817                 tcursor(CURSOR_LOAD);
 818                 break;
 819         }
 820 }
 821
 822 void
 823 csidump(void) {
 824         int i;
 825         printf("ESC [ %s", escseq.priv ? "? " : "");
 826         if(escseq.narg)
 827                 for(i = 0; i < escseq.narg; i++)
 828                         printf("%d ", escseq.arg[i]);
 829         if(escseq.mode)
 830                 putchar(escseq.mode);
 831         putchar('\n');
 832 }
 833
 834 void
 835 csireset(void) {
 836         memset(&escseq, 0, sizeof(escseq));
 837 }
 838
 839 void
 840 tputtab(void) {
 841         int space = TAB - term.c.x % TAB;
 842         tmoveto(term.c.x + space, term.c.y);
 843 }
 844
 845 void
 846 tputc(char c) {
 847         if(term.esc & ESC_START) {
 848                 if(term.esc & ESC_CSI) {
 849                         escseq.buf[escseq.len++] = c;
 850                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 851                                 term.esc = 0;
 852                                 csiparse(), csihandle();
 853                         }
 854                 } else if(term.esc & ESC_OSC) {
 855                         if(c == ';') {
 856                                 term.titlelen = 0;
 857                                 term.esc = ESC_START | ESC_TITLE;
 858                         }
 859                 } else if(term.esc & ESC_TITLE) {
 860                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 861                                 term.esc = 0;
 862                                 term.title[term.titlelen] = '\0';
 863                                 XStoreName(xw.dis, xw.win, term.title);
 864                         } else {
 865                                 term.title[term.titlelen++] = c;
 866                         }
 867                 } else if(term.esc & ESC_ALTCHARSET) {
 868                         switch(c) {
 869                         case '0': /* Line drawing crap */
 870                                 term.c.attr.mode |= ATTR_GFX;
 871                                 break;
 872                         case 'B': /* Back to regular text */
 873                                 term.c.attr.mode &= ~ATTR_GFX;
 874                                 break;
 875                         default:
 876                                 printf("esc unhandled charset: ESC ( %c\n", c);
 877                         }
 878                         term.esc = 0;
 879                 } else {
 880                         switch(c) {
 881                         case '[':
 882                                 term.esc |= ESC_CSI;
 883                                 break;
 884                         case ']':
 885                                 term.esc |= ESC_OSC;
 886                                 break;
 887                         case '(':
 888                                 term.esc |= ESC_ALTCHARSET;
 889                                 break;
 890                         case 'A':
 891                                 tmoveto(term.c.x, term.c.y-1);
 892                                 term.esc = 0;
 893                                 break;
 894                         case 'B':
 895                                 tmoveto(term.c.x, term.c.y+1);
 896                                 term.esc = 0;
 897                                 break;
 898                         case 'C':
 899                                 tmoveto(term.c.x+1, term.c.y);
 900                                 term.esc = 0;
 901                                 break;
 902                         case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
 903                                 tmoveto(term.c.x-1, term.c.y);
 904                                 term.esc = 0;
 905                                 break;
 906                         case 'E': /* NEL -- Next line */
 907                                 tnewline();
 908                                 term.esc = 0;
 909                                 break;
 910                         case 'M': /* RI -- Reverse index */
 911                                 if(term.c.y == term.top)
 912                                         tscrolldown(1);
 913                                 else
 914                                         tmoveto(term.c.x, term.c.y-1);
 915                                 term.esc = 0;
 916                                 break;
 917                         case 'c': /* RIS -- Reset to inital state */
 918                                 treset();
 919                                 term.esc = 0;
 920                                 break;
 921                         case '=': /* DECPAM */
 922                                 term.mode |= MODE_APPKEYPAD;
 923                                 term.esc = 0;
 924                                 break;
 925                         case '>': /* DECPNM */
 926                                 term.mode &= ~MODE_APPKEYPAD;
 927                                 term.esc = 0;
 928                                 break;
 929                         case '7':
 930                                 tcursor(CURSOR_SAVE);
 931                                 term.esc = 0;
 932                                 break;
 933                         case '8':
 934                                 tcursor(CURSOR_LOAD);
 935                                 term.esc = 0;
 936                                 break;
 937                         default:
 938                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
 939                                 term.esc = 0;
 940                         }
 941                 }
 942         } else {
 943                 switch(c) {
 944                 case '\t':
 945                         tputtab();
 946                         break;
 947                 case '\b':
 948                         tmoveto(term.c.x-1, term.c.y);
 949                         break;
 950                 case '\r':
 951                         tmoveto(0, term.c.y);
 952                         break;
 953                 case '\n':
 954                         tnewline();
 955                         break;
 956                 case '\a':
 957                         xbell();
 958                         break;
 959                 case '\033':
 960                         csireset();
 961                         term.esc = ESC_START;
 962                         break;
 963                 default:
 964                         tsetchar(c);
 965                         if(term.c.x+1 < term.col) {
 966                                 tmoveto(term.c.x+1, term.c.y);
 967                         } else if(IS_SET(MODE_WRAP))
 968                                 tnewline();
 969                         break;
 970                 }
 971         }
 972 }
 973
 974 void
 975 tputs(char *s, int len) {
 976         for(; len > 0; len--)
 977                 tputc(*s++);
 978 }
 979
 980 void
 981 tresize(int col, int row) {
 982         int i;
 983         int minrow = MIN(row, term.row);
 984         int mincol = MIN(col, term.col);
 985
 986         if(col < 1 || row < 1)
 987                 return;
 988
 989         /* free uneeded rows */
 990         for(i = row; i < term.row; i++)
 991                 free(term.line[i]);
 992
 993         /* resize to new height */
 994         term.line = realloc(term.line, row * sizeof(Line));
 995
 996         /* resize each row to new width, zero-pad if needed */
 997         for(i = 0; i < minrow; i++) {
 998                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
 999                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1000         }
1001
1002         /* allocate any new rows */
1003         for(/* i == minrow */; i < row; i++)
1004                 term.line[i] = calloc(col, sizeof(Glyph));
1005
1006         LIMIT(term.c.x, 0, col-1);
1007         LIMIT(term.c.y, 0, row-1);
1008         LIMIT(term.top, 0, row-1);
1009         LIMIT(term.bot, 0, row-1);
1010
1011         term.bot = row-1;
1012         term.col = col, term.row = row;
1013 }
1014
1015 void
1016 xloadcols(void) {
1017         int i, r, g, b;
1018         XColor color;
1019         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1020         unsigned long white = WhitePixel(xw.dis, xw.scr);
1021
1022         for(i = 0; i < 16; i++) {
1023                 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1024                         dc.col[i] = white;
1025                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1026                 } else
1027                         dc.col[i] = color.pixel;
1028         }
1029
1030         /* same colors as xterm */
1031         for(r = 0; r < 6; r++)
1032                 for(g = 0; g < 6; g++)
1033                         for(b = 0; b < 6; b++) {
1034                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1035                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1036                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1037                                 if (!XAllocColor(xw.dis, cmap, &color)) {
1038                                         dc.col[i] = white;
1039                                         fprintf(stderr, "Could not allocate color %d\n", i);
1040                                 } else
1041                                         dc.col[i] = color.pixel;
1042                                 i++;
1043                         }
1044
1045         for(r = 0; r < 24; r++, i++) {
1046                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1047                 if (!XAllocColor(xw.dis, cmap, &color)) {
1048                         dc.col[i] = white;
1049                         fprintf(stderr, "Could not allocate color %d\n", i);
1050                 } else
1051                         dc.col[i] = color.pixel;
1052         }
1053 }
1054
1055 void
1056 xclear(int x1, int y1, int x2, int y2) {
1057         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1058         XFillRectangle(xw.dis, xw.buf, dc.gc,
1059                        x1 * xw.cw, y1 * xw.ch,
1060                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1061 }
1062
1063 void
1064 xhints(void)
1065 {
1066         XClassHint class = {TNAME, TNAME};
1067         XWMHints wm = {.flags = InputHint, .input = 1};
1068         XSizeHints size = {
1069                 .flags = PSize | PResizeInc | PBaseSize,
1070                 .height = xw.h,
1071                 .width = xw.w,
1072                 .height_inc = xw.ch,
1073                 .width_inc = xw.cw,
1074                 .base_height = 2*BORDER,
1075                 .base_width = 2*BORDER,
1076         };
1077         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1078 }
1079
1080 void
1081 xinit(void) {
1082         if(!(xw.dis = XOpenDisplay(NULL)))
1083                 die("Can't open display\n");
1084         xw.scr = XDefaultScreen(xw.dis);
1085
1086         /* font */
1087         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1088                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1089
1090         /* XXX: Assuming same size for bold font */
1091         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1092         xw.ch = dc.font->ascent + dc.font->descent;
1093
1094         /* colors */
1095         xloadcols();
1096
1097         term.c.attr.fg = DefaultFG;
1098         term.c.attr.bg = DefaultBG;
1099         term.c.attr.mode = ATTR_NULL;
1100         /* windows */
1101         xw.h = term.row * xw.ch + 2*BORDER;
1102         xw.w = term.col * xw.cw + 2*BORDER;
1103         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1104                         xw.w, xw.h, 0,
1105                         dc.col[DefaultBG],
1106                         dc.col[DefaultBG]);
1107         xw.bufw = xw.w - 2*BORDER;
1108         xw.bufh = xw.h - 2*BORDER;
1109         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1110         /* gc */
1111         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1112         XMapWindow(xw.dis, xw.win);
1113         xhints();
1114         XStoreName(xw.dis, xw.win, "st");
1115         XSync(xw.dis, 0);
1116 }
1117
1118 void
1119 xdraws(char *s, Glyph base, int x, int y, int len) {
1120         unsigned long xfg, xbg;
1121         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1122         int i;
1123
1124         if(base.mode & ATTR_REVERSE)
1125                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1126         else
1127                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1128
1129         XSetBackground(xw.dis, dc.gc, xbg);
1130         XSetForeground(xw.dis, dc.gc, xfg);
1131
1132         if(base.mode & ATTR_GFX)
1133                 for(i = 0; i < len; i++)
1134                         s[i] = gfx[(int)s[i]];
1135
1136         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1137         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1138
1139         if(base.mode & ATTR_UNDERLINE)
1140                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1141 }
1142
1143 void
1144 xcursor(int mode) {
1145         static int oldx = 0;
1146         static int oldy = 0;
1147         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1148
1149         LIMIT(oldx, 0, term.col-1);
1150         LIMIT(oldy, 0, term.row-1);
1151
1152         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1153                 g.c = term.line[term.c.y][term.c.x].c;
1154
1155         /* remove the old cursor */
1156         if(term.line[oldy][oldx].state & GLYPH_SET)
1157                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1158         else
1159                 xclear(oldx, oldy, oldx, oldy);
1160
1161         /* draw the new one */
1162         if(mode == CURSOR_DRAW) {
1163                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1164                 oldx = term.c.x, oldy = term.c.y;
1165         }
1166 }
1167
1168 #ifdef DEBUG
1169 /* basic drawing routines */
1170 void
1171 xdrawc(int x, int y, Glyph g) {
1172         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1173         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1174         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1175         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1176         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1177 }
1178
1179 void
1180 draw(int dummy) {
1181         int x, y;
1182
1183         xclear(0, 0, term.col-1, term.row-1);
1184         for(y = 0; y < term.row; y++)
1185                 for(x = 0; x < term.col; x++)
1186                         if(term.line[y][x].state & GLYPH_SET)
1187                                 xdrawc(x, y, term.line[y][x]);
1188
1189         if(!term.hidec)
1190                 xcursor(CURSOR_DRAW);
1191         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1192         XFlush(xw.dis);
1193 }
1194
1195 #else
1196 /* optimized drawing routine */
1197 void
1198 draw(int redraw_all) {
1199         int i, x, y, ox;
1200         Glyph base, new;
1201         char buf[DRAW_BUF_SIZ];
1202
1203         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1204         XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1205         for(y = 0; y < term.row; y++) {
1206                 base = term.line[y][0];
1207                 i = ox = 0;
1208                 for(x = 0; x < term.col; x++) {
1209                         new = term.line[y][x];
1210                         if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1211                                 buf[i++] = new.c;
1212                         else {
1213                                 xdraws(buf, base, ox, y, i);
1214                                 buf[0] = new.c;
1215                                 i = 1;
1216                                 ox = x;
1217                                 base = new;
1218                         }
1219                 }
1220                 xdraws(buf, base, ox, y, i);
1221         }
1222         xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1223         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1224         XFlush(xw.dis);
1225 }
1226
1227 #endif
1228
1229 void
1230 expose(XEvent *ev) {
1231         draw(SCREEN_REDRAW);
1232 }
1233
1234 char*
1235 kmap(KeySym k) {
1236         int i;
1237         for(i = 0; i < LEN(key); i++)
1238                 if(key[i].k == k)
1239                         return (char*)key[i].s;
1240         return NULL;
1241 }
1242
1243 void
1244 kpress(XEvent *ev) {
1245         XKeyEvent *e = &ev->xkey;
1246         KeySym ksym;
1247         char buf[32];
1248         char *customkey;
1249         int len;
1250         int meta;
1251         int shift;
1252
1253         meta = e->state & Mod1Mask;
1254         shift = e->state & ShiftMask;
1255         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1256
1257         if((customkey = kmap(ksym)))
1258                 ttywrite(customkey, strlen(customkey));
1259         else if(len > 0) {
1260                 buf[sizeof(buf)-1] = '\0';
1261                 if(meta && len == 1)
1262                         ttywrite("\033", 1);
1263                 ttywrite(buf, len);
1264         } else
1265                 switch(ksym) {
1266                 case XK_Up:
1267                 case XK_Down:
1268                 case XK_Left:
1269                 case XK_Right:
1270                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1271                         ttywrite(buf, 3);
1272                         break;
1273                 case XK_Insert:
1274                         if(shift)
1275                                 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1276                         break;
1277                 default:
1278                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1279                         break;
1280                 }
1281 }
1282
1283 void
1284 resize(XEvent *e) {
1285         int col, row;
1286
1287         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1288                 return;
1289
1290         xw.w = e->xconfigure.width;
1291         xw.h = e->xconfigure.height;
1292         xw.bufw = xw.w - 2*BORDER;
1293         xw.bufh = xw.h - 2*BORDER;
1294         col = xw.bufw / xw.cw;
1295         row = xw.bufh / xw.ch;
1296         tresize(col, row);
1297         ttyresize(col, row);
1298         XFreePixmap(xw.dis, xw.buf);
1299         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1300         draw(SCREEN_REDRAW);
1301 }
1302
1303 void
1304 run(void) {
1305         XEvent ev;
1306         fd_set rfd;
1307         int xfd = XConnectionNumber(xw.dis);
1308
1309         running = 1;
1310         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1311         XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1312
1313         while(running) {
1314                 FD_ZERO(&rfd);
1315                 FD_SET(cmdfd, &rfd);
1316                 FD_SET(xfd, &rfd);
1317                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1318                         if(errno == EINTR)
1319                                 continue;
1320                         die("select failed: %s\n", SERRNO);
1321                 }
1322                 if(FD_ISSET(cmdfd, &rfd)) {
1323                         ttyread();
1324                         draw(SCREEN_UPDATE);
1325                 }
1326                 while(XPending(xw.dis)) {
1327                         XNextEvent(xw.dis, &ev);
1328                         if(handler[ev.type])
1329                                 (handler[ev.type])(&ev);
1330                 }
1331         }
1332 }
1333
1334 int
1335 main(int argc, char *argv[]) {
1336         if(argc == 2 && !strncmp("-v", argv[1], 3))
1337                 die("st-" VERSION ", (c) 2010 st engineers\n");
1338         else if(argc != 1)
1339                 die("usage: st [-v]\n");
1340         setlocale(LC_CTYPE, "");
1341         tnew(80, 24);
1342         ttynew();
1343         xinit();
1344         run();
1345         return 0;
1346 }