st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <signal.h>
  13 #include <sys/ioctl.h>
  14 #include <sys/select.h>
  15 #include <sys/stat.h>
  16 #include <sys/types.h>
  17 #include <sys/wait.h>
  18 #include <unistd.h>
  19 #include <X11/Xlib.h>
  20 #include <X11/keysym.h>
  21 #include <X11/Xutil.h>
  22
  23 /* Arbitrary sizes */
  24 #define ESC_TITLE_SIZ 256
  25 #define ESC_BUF_SIZ   256
  26 #define ESC_ARG_SIZ   16
  27 #define DRAW_BUF_SIZ  1024
  28
  29 #define SERRNO strerror(errno)
  30 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  31 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  32 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  33 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  34 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  35 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  36 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  37
  38 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  39 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  40 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
  41        CURSOR_SAVE, CURSOR_LOAD };
  42 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  43 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
  44 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  45 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  46
  47 typedef struct {
  48         char c;     /* character code  */
  49         char mode;  /* attribute flags */
  50         int fg;     /* foreground      */
  51         int bg;     /* background      */
  52         char state; /* state flags     */
  53 } Glyph;
  54
  55 typedef Glyph* Line;
  56
  57 typedef struct {
  58         Glyph attr;      /* current char attributes */
  59         int x;
  60         int y;
  61 } TCursor;
  62
  63 /* CSI Escape sequence structs */
  64 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  65 typedef struct {
  66         char buf[ESC_BUF_SIZ]; /* raw string */
  67         int len;                           /* raw string length */
  68         char priv;
  69         int arg[ESC_ARG_SIZ];
  70         int narg;                          /* nb of args */
  71         char mode;
  72 } CSIEscape;
  73
  74 /* Internal representation of the screen */
  75 typedef struct {
  76         int row;        /* nb row */
  77         int col;        /* nb col */
  78         Line* line; /* screen */
  79         TCursor c;      /* cursor */
  80         char hidec;
  81         int top;        /* top    scroll limit */
  82         int bot;        /* bottom scroll limit */
  83         int mode;       /* terminal mode flags */
  84         int esc;        /* escape state flags */
  85         char title[ESC_TITLE_SIZ];
  86         int titlelen;
  87 } Term;
  88
  89 /* Purely graphic info */
  90 typedef struct {
  91         Display* dis;
  92         Window win;
  93         Pixmap buf;
  94         int scr;
  95         int w;  /* window width  */
  96         int h;  /* window height */
  97         int bufw; /* pixmap width  */
  98         int bufh; /* pixmap height */
  99         int ch; /* char height */
 100         int cw; /* char width  */
 101 } XWindow;
 102
 103 typedef struct {
 104         KeySym k;
 105         char s[ESC_BUF_SIZ];
 106 } Key;
 107
 108 /* Drawing Context */
 109 typedef struct {
 110         unsigned long col[256];
 111         XFontStruct* font;
 112         XFontStruct* bfont;
 113         GC gc;
 114 } DC;
 115
 116 #include "config.h"
 117
 118 static void die(const char *errstr, ...);
 119 static void draw(int);
 120 static void execsh(void);
 121 static void sigchld(int);
 122 static void run(void);
 123
 124 static void csidump(void);
 125 static void csihandle(void);
 126 static void csiparse(void);
 127 static void csireset(void);
 128
 129 static void tclearregion(int, int, int, int);
 130 static void tcursor(int);
 131 static void tmovecursor(int);
 132 static void tdeletechar(int);
 133 static void tdeleteline(int);
 134 static void tinsertblank(int);
 135 static void tinsertblankline(int);
 136 static void tmoveto(int, int);
 137 static void tnew(int, int);
 138 static void tnewline(void);
 139 static void tputtab(void);
 140 static void tputc(char);
 141 static void tputs(char*, int);
 142 static void treset(void);
 143 static void tresize(int, int);
 144 static void tscroll(void);
 145 static void tscrollup(int);
 146 static void tscrolldown(int);
 147 static void tsetattr(int*, int);
 148 static void tsetchar(char);
 149 static void tsetscroll(int, int);
 150
 151 static void ttynew(void);
 152 static void ttyread(void);
 153 static void ttyresize(int, int);
 154 static void ttywrite(const char *, size_t);
 155
 156 static void xbell(void);
 157 static void xdraws(char *, Glyph, int, int, int);
 158 static void xhints(void);
 159 static void xclear(int, int, int, int);
 160 static void xcursor(int);
 161 static void xinit(void);
 162 static void xloadcols(void);
 163
 164 static void expose(XEvent *);
 165 static char* kmap(KeySym);
 166 static void kpress(XEvent *);
 167 static void resize(XEvent *);
 168
 169 static void (*handler[LASTEvent])(XEvent *) = {
 170         [KeyPress] = kpress,
 171         [Expose] = expose,
 172         [ConfigureNotify] = resize
 173 };
 174
 175 /* Globals */
 176 static DC dc;
 177 static XWindow xw;
 178 static Term term;
 179 static CSIEscape escseq;
 180 static int cmdfd;
 181 static pid_t pid;
 182 static int running;
 183
 184 #ifdef DEBUG
 185 void
 186 tdump(void) {
 187         int row, col;
 188         Glyph c;
 189
 190         for(row = 0; row < term.row; row++) {
 191                 for(col = 0; col < term.col; col++) {
 192                         if(col == term.c.x && row == term.c.y)
 193                                 putchar('#');
 194                         else {
 195                                 c = term.line[row][col];
 196                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 197                         }
 198                 }
 199                 putchar('\n');
 200         }
 201 }
 202 #endif
 203
 204 void
 205 die(const char *errstr, ...) {
 206         va_list ap;
 207
 208         va_start(ap, errstr);
 209         vfprintf(stderr, errstr, ap);
 210         va_end(ap);
 211         exit(EXIT_FAILURE);
 212 }
 213
 214 void
 215 execsh(void) {
 216         char *args[3] = {getenv("SHELL"), "-i", NULL};
 217         DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
 218         putenv("TERM=" TNAME);
 219         execvp(args[0], args);
 220 }
 221
 222 void
 223 xbell(void) { /* visual bell */
 224         XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
 225         XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
 226         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 227         /* usleep(30000); */
 228         draw(SCREEN_REDRAW);
 229 }
 230
 231 void
 232 sigchld(int a) {
 233         int stat = 0;
 234         if(waitpid(pid, &stat, 0) < 0)
 235                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 236         if(WIFEXITED(stat))
 237                 exit(WEXITSTATUS(stat));
 238         else
 239                 exit(EXIT_FAILURE);
 240 }
 241
 242 void
 243 ttynew(void) {
 244         int m, s;
 245         char *pts;
 246
 247         if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
 248                 die("openpt failed: %s\n", SERRNO);
 249         if(grantpt(m) < 0)
 250                 die("grantpt failed: %s\n", SERRNO);
 251         if(unlockpt(m) < 0)
 252                 die("unlockpt failed: %s\n", SERRNO);
 253         if(!(pts = ptsname(m)))
 254                 die("ptsname failed: %s\n", SERRNO);
 255         if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
 256                 die("Couldn't open slave: %s\n", SERRNO);
 257         fcntl(s, F_SETFL, O_NDELAY);
 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) {   /* screen size */
 340         term.row = row, term.col = col;
 341         term.top = 0, term.bot = term.row - 1;
 342         /* mode */
 343         term.mode = MODE_WRAP;
 344         /* cursor */
 345         term.c.attr.mode = ATTR_NULL;
 346         term.c.attr.fg = DefaultFG;
 347         term.c.attr.bg = DefaultBG;
 348         term.c.x = term.c.y = 0;
 349         term.hidec = 0;
 350         /* allocate screen */
 351         term.line = calloc(term.row, sizeof(Line));
 352         for(row = 0 ; row < term.row; row++)
 353                 term.line[row] = calloc(term.col, sizeof(Glyph));
 354 }
 355
 356 /* TODO: Replace with scrollup/scolldown */
 357 void
 358 tscroll(void) {
 359         Line temp = term.line[term.top];
 360         int i;
 361
 362         for(i = term.top; i < term.bot; i++)
 363                 term.line[i] = term.line[i+1];
 364         memset(temp, 0, sizeof(Glyph) * term.col);
 365         term.line[term.bot] = temp;
 366 }
 367
 368 void
 369 tscrolldown (int n) {
 370         int i;
 371         Line temp;
 372
 373         LIMIT(n, 0, term.bot-term.top+1);
 374
 375         for(i = 0; i < n; i++)
 376                 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
 377
 378         for(i = term.bot; i >= term.top+n; i--) {
 379                 temp = term.line[i];
 380                 term.line[i] = term.line[i-n];
 381                 term.line[i-n] = temp;
 382         }
 383 }
 384
 385 void
 386 tscrollup (int n) {
 387         int i;
 388         Line temp;
 389         LIMIT(n, 0, term.bot-term.top+1);
 390
 391         for(i = 0; i < n; i++)
 392                 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
 393
 394          for(i = term.top; i <= term.bot-n; i++) {
 395                  temp = term.line[i];
 396                  term.line[i] = term.line[i+n];
 397                  term.line[i+n] = temp;
 398          }
 399 }
 400
 401 void
 402 tnewline(void) {
 403         int y = term.c.y + 1;
 404         if(y > term.bot)
 405                 tscroll(), y = term.bot;
 406         tmoveto(0, y);
 407 }
 408
 409 void
 410 csiparse(void) {
 411         /* int noarg = 1; */
 412         char *p = escseq.buf;
 413
 414         escseq.narg = 0;
 415         if(*p == '?')
 416                 escseq.priv = 1, p++;
 417
 418         while(p < escseq.buf+escseq.len) {
 419                 while(isdigit(*p)) {
 420                         escseq.arg[escseq.narg] *= 10;
 421                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 422                 }
 423                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 424                         escseq.narg++, p++;
 425                 else {
 426                         escseq.mode = *p;
 427                         escseq.narg++;
 428                         return;
 429                 }
 430         }
 431 }
 432
 433 void
 434 tmoveto(int x, int y) {
 435         term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
 436         term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
 437 }
 438
 439 void
 440 tmovecursor(int dir) {
 441         int xf = term.c.x, yf = term.c.y;
 442
 443         switch(dir) {
 444         case CURSOR_UP:
 445                 yf--;
 446                 break;
 447         case CURSOR_DOWN:
 448                 yf++;
 449                 break;
 450         case CURSOR_LEFT:
 451                 xf--;
 452                 break;
 453         case CURSOR_RIGHT:
 454                 xf++;
 455                 if(term.mode & MODE_WRAP && xf >= term.col) {
 456                         xf = 0, yf++;
 457                         if(yf > term.bot)
 458                                 yf = term.bot, tscroll();
 459                 }
 460                 break;
 461         }
 462         tmoveto(xf, yf);
 463 }
 464
 465 void
 466 tsetchar(char c) {
 467         term.line[term.c.y][term.c.x] = term.c.attr;
 468         term.line[term.c.y][term.c.x].c = c;
 469         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 470 }
 471
 472 void
 473 tclearregion(int x1, int y1, int x2, int y2) {
 474         int y, temp;
 475
 476         if(x1 > x2)
 477                 temp = x1, x1 = x2, x2 = temp;
 478         if(y1 > y2)
 479                 temp = y1, y1 = y2, y2 = temp;
 480
 481         LIMIT(x1, 0, term.col-1);
 482         LIMIT(x2, 0, term.col-1);
 483         LIMIT(y1, 0, term.row-1);
 484         LIMIT(y2, 0, term.row-1);
 485
 486         for(y = y1; y <= y2; y++)
 487                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 488 }
 489
 490 void
 491 tdeletechar(int n) {
 492         int src = term.c.x + n;
 493         int dst = term.c.x;
 494         int size = term.col - src;
 495
 496         if(src >= term.col) {
 497                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 498                 return;
 499         }
 500         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 501         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 502 }
 503
 504 void
 505 tinsertblank(int n) {
 506         int src = term.c.x;
 507         int dst = src + n;
 508         int size = term.col - dst;
 509
 510         if(dst >= term.col) {
 511                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 512                 return;
 513         }
 514         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 515         tclearregion(src, term.c.y, dst - 1, term.c.y);
 516 }
 517
 518 void
 519 tinsertblankline(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 = bot; i >= term.c.y+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 tdeleteline(int n) {
 544         int i;
 545         Line blank;
 546         int bot = term.bot;
 547
 548         if(term.c.y > term.bot)
 549                 bot = term.row - 1;
 550         else if(term.c.y < term.top)
 551                 bot = term.top - 1;
 552         if(term.c.y + n >= bot) {
 553                 tclearregion(0, term.c.y, term.col-1, bot);
 554                 return;
 555         }
 556         for(i = term.c.y; i <= bot-n; i++) {
 557                 /* swap deleted line <-> blanked line */
 558                 blank = term.line[i];
 559                 term.line[i] = term.line[i+n];
 560                 term.line[i+n] = blank;
 561                 /* blank it */
 562                 memset(blank, 0, term.col * sizeof(Glyph));
 563         }
 564 }
 565
 566 void
 567 tsetattr(int *attr, int l) {
 568         int i;
 569
 570         for(i = 0; i < l; i++) {
 571                 switch(attr[i]) {
 572                 case 0:
 573                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 574                         term.c.attr.fg = DefaultFG;
 575                         term.c.attr.bg = DefaultBG;
 576                         break;
 577                 case 1:
 578                         term.c.attr.mode |= ATTR_BOLD;
 579                         break;
 580                 case 4:
 581                         term.c.attr.mode |= ATTR_UNDERLINE;
 582                         break;
 583                 case 7:
 584                         term.c.attr.mode |= ATTR_REVERSE;
 585                         break;
 586                 case 22:
 587                         term.c.attr.mode &= ~ATTR_BOLD;
 588                         break;
 589                 case 24:
 590                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 591                         break;
 592                 case 27:
 593                         term.c.attr.mode &= ~ATTR_REVERSE;
 594                         break;
 595                 case 38:
 596                         if (i + 2 < l && attr[i + 1] == 5) {
 597                                 i += 2;
 598                                 if (BETWEEN(attr[i], 0, 255))
 599                                         term.c.attr.fg = attr[i];
 600                                 else
 601                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 602                         }
 603                         else
 604                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 605                         break;
 606                 case 39:
 607                         term.c.attr.fg = DefaultFG;
 608                         break;
 609                 case 48:
 610                         if (i + 2 < l && attr[i + 1] == 5) {
 611                                 i += 2;
 612                                 if (BETWEEN(attr[i], 0, 255))
 613                                         term.c.attr.bg = attr[i];
 614                                 else
 615                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 616                         }
 617                         else
 618                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 619                         break;
 620                 case 49:
 621                         term.c.attr.bg = DefaultBG;
 622                         break;
 623                 default:
 624                         if(BETWEEN(attr[i], 30, 37))
 625                                 term.c.attr.fg = attr[i] - 30;
 626                         else if(BETWEEN(attr[i], 40, 47))
 627                                 term.c.attr.bg = attr[i] - 40;
 628                         else if(BETWEEN(attr[i], 90, 97))
 629                                 term.c.attr.fg = attr[i] - 90 + 8;
 630                         else if(BETWEEN(attr[i], 100, 107))
 631                                 term.c.attr.fg = attr[i] - 100 + 8;
 632                         else
 633                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 634                         break;
 635                 }
 636         }
 637 }
 638
 639 void
 640 tsetscroll(int t, int b) {
 641         int temp;
 642
 643         LIMIT(t, 0, term.row-1);
 644         LIMIT(b, 0, term.row-1);
 645         if(t > b) {
 646                 temp = t;
 647                 t = b;
 648                 b = temp;
 649         }
 650         term.top = t;
 651         term.bot = b;
 652 }
 653
 654 void
 655 csihandle(void) {
 656         switch(escseq.mode) {
 657         default:
 658         unknown:
 659                 printf("erresc: unknown csi ");
 660                 csidump();
 661                 /* die(""); */
 662                 break;
 663         case '@': /* ICH -- Insert <n> blank char */
 664                 DEFAULT(escseq.arg[0], 1);
 665                 tinsertblank(escseq.arg[0]);
 666                 break;
 667         case 'A': /* CUU -- Cursor <n> Up */
 668         case 'e':
 669                 DEFAULT(escseq.arg[0], 1);
 670                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 671                 break;
 672         case 'B': /* CUD -- Cursor <n> Down */
 673                 DEFAULT(escseq.arg[0], 1);
 674                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 675                 break;
 676         case 'C': /* CUF -- Cursor <n> Forward */
 677         case 'a':
 678                 DEFAULT(escseq.arg[0], 1);
 679                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 680                 break;
 681         case 'D': /* CUB -- Cursor <n> Backward */
 682                 DEFAULT(escseq.arg[0], 1);
 683                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 684                 break;
 685         case 'E': /* CNL -- Cursor <n> Down and first col */
 686                 DEFAULT(escseq.arg[0], 1);
 687                 tmoveto(0, term.c.y+escseq.arg[0]);
 688                 break;
 689         case 'F': /* CPL -- Cursor <n> Up and first col */
 690                 DEFAULT(escseq.arg[0], 1);
 691                 tmoveto(0, term.c.y-escseq.arg[0]);
 692                 break;
 693         case 'G': /* CHA -- Move to <col> */
 694         case '`': /* XXX: HPA -- same? */
 695                 DEFAULT(escseq.arg[0], 1);
 696                 tmoveto(escseq.arg[0]-1, term.c.y);
 697                 break;
 698         case 'H': /* CUP -- Move to <row> <col> */
 699         case 'f': /* XXX: HVP -- same? */
 700                 DEFAULT(escseq.arg[0], 1);
 701                 DEFAULT(escseq.arg[1], 1);
 702                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 703                 break;
 704         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 705         case 'J': /* ED -- Clear screen */
 706                 switch(escseq.arg[0]) {
 707                 case 0: /* below */
 708                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 709                         break;
 710                 case 1: /* above */
 711                         tclearregion(0, 0, term.c.x, term.c.y);
 712                         break;
 713                 case 2: /* all */
 714                         tclearregion(0, 0, term.col-1, term.row-1);
 715                         break;
 716                 case 3: /* XXX: erase saved lines (xterm) */
 717                 default:
 718                         goto unknown;
 719                 }
 720                 break;
 721         case 'K': /* EL -- Clear line */
 722                 switch(escseq.arg[0]) {
 723                 case 0: /* right */
 724                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 725                         break;
 726                 case 1: /* left */
 727                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 728                         break;
 729                 case 2: /* all */
 730                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 731                         break;
 732                 }
 733                 break;
 734         case 'S': /* SU -- Scroll <n> line up */
 735                 DEFAULT(escseq.arg[0], 1);
 736                 tscrollup(escseq.arg[0]);
 737                 break;
 738         case 'T': /* SD -- Scroll <n> line down */
 739                 DEFAULT(escseq.arg[0], 1);
 740                 tscrolldown(escseq.arg[0]);
 741                 break;
 742         case 'L': /* IL -- Insert <n> blank lines */
 743                 DEFAULT(escseq.arg[0], 1);
 744                 tinsertblankline(escseq.arg[0]);
 745                 break;
 746         case 'l': /* RM -- Reset Mode */
 747                 if(escseq.priv) {
 748                         switch(escseq.arg[0]) {
 749                         case 1:
 750                                 term.mode &= ~MODE_APPKEYPAD;
 751                                 break;
 752                         case 7:
 753                                 term.mode &= ~MODE_WRAP;
 754                                 break;
 755                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 756                                 break;
 757                         case 25:
 758                                 term.hidec = 1;
 759                                 break;
 760                         case 1048: /* XXX: no alt. screen to erase/save */
 761                         case 1049:
 762                                 tcursor(CURSOR_LOAD);
 763                                 tclearregion(0, 0, term.col-1, term.row-1);
 764                                 break;
 765                         default:
 766                                 goto unknown;
 767                         }
 768                 } else {
 769                         switch(escseq.arg[0]) {
 770                         case 4:
 771                                 term.mode &= ~MODE_INSERT;
 772                                 break;
 773                         default:
 774                                 goto unknown;
 775                         }
 776                 }
 777                 break;
 778         case 'M': /* DL -- Delete <n> lines */
 779                 DEFAULT(escseq.arg[0], 1);
 780                 tdeleteline(escseq.arg[0]);
 781                 break;
 782         case 'X': /* ECH -- Erase <n> char */
 783                 DEFAULT(escseq.arg[0], 1);
 784                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 785                 break;
 786         case 'P': /* DCH -- Delete <n> char */
 787                 DEFAULT(escseq.arg[0], 1);
 788                 tdeletechar(escseq.arg[0]);
 789                 break;
 790         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 791         case 'd': /* VPA -- Move to <row> */
 792                 DEFAULT(escseq.arg[0], 1);
 793                 tmoveto(term.c.x, escseq.arg[0]-1);
 794                 break;
 795         case 'h': /* SM -- Set terminal mode */
 796                 if(escseq.priv) {
 797                         switch(escseq.arg[0]) {
 798                         case 1:
 799                                 term.mode |= MODE_APPKEYPAD;
 800                                 break;
 801                         case 7:
 802                                 term.mode |= MODE_WRAP;
 803                                 break;
 804                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 805                                 break;
 806                         case 25:
 807                                 term.hidec = 0;
 808                                 break;
 809                         case 1048:
 810                         case 1049: /* XXX: no alt. screen to erase/save */
 811                                 tcursor(CURSOR_SAVE);
 812                                 tclearregion(0, 0, term.col-1, term.row-1);
 813                                 break;
 814                         default: goto unknown;
 815                         }
 816                 } else {
 817                         switch(escseq.arg[0]) {
 818                         case 4:
 819                                 term.mode |= MODE_INSERT;
 820                                 break;
 821                         default: goto unknown;
 822                         }
 823                 };
 824                 break;
 825         case 'm': /* SGR -- Terminal attribute (color) */
 826                 tsetattr(escseq.arg, escseq.narg);
 827                 break;
 828         case 'r': /* DECSTBM -- Set Scrolling Region */
 829                 if(escseq.priv)
 830                         goto unknown;
 831                 else {
 832                         DEFAULT(escseq.arg[0], 1);
 833                         DEFAULT(escseq.arg[1], term.row);
 834                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 835                 }
 836                 break;
 837         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 838                 tcursor(CURSOR_SAVE);
 839                 break;
 840         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 841                 tcursor(CURSOR_LOAD);
 842                 break;
 843         }
 844 }
 845
 846 void
 847 csidump(void) {
 848         int i;
 849         printf("ESC [ %s", escseq.priv ? "? " : "");
 850         if(escseq.narg)
 851                 for(i = 0; i < escseq.narg; i++)
 852                         printf("%d ", escseq.arg[i]);
 853         if(escseq.mode)
 854                 putchar(escseq.mode);
 855         putchar('\n');
 856 }
 857
 858 void
 859 csireset(void) {
 860         memset(&escseq, 0, sizeof(escseq));
 861 }
 862
 863 void
 864 tputtab(void) {
 865         int space = TAB - term.c.x % TAB;
 866         tmoveto(term.c.x + space, term.c.y);
 867 }
 868
 869 void
 870 tputc(char c) {
 871         if(term.esc & ESC_START) {
 872                 if(term.esc & ESC_CSI) {
 873                         escseq.buf[escseq.len++] = c;
 874                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 875                                 term.esc = 0;
 876                                 csiparse(), csihandle();
 877                         }
 878                 } else if(term.esc & ESC_OSC) {
 879                         if(c == ';') {
 880                                 term.titlelen = 0;
 881                                 term.esc = ESC_START | ESC_TITLE;
 882                         }
 883                 } else if(term.esc & ESC_TITLE) {
 884                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 885                                 term.esc = 0;
 886                                 term.title[term.titlelen] = '\0';
 887                                 XStoreName(xw.dis, xw.win, term.title);
 888                         } else {
 889                                 term.title[term.titlelen++] = c;
 890                         }
 891                 } else if(term.esc & ESC_ALTCHARSET) {
 892                         switch(c) {
 893                         case '0': /* Line drawing crap */
 894                                 term.c.attr.mode |= ATTR_GFX;
 895                                 break;
 896                         case 'B': /* Back to regular text */
 897                                 term.c.attr.mode &= ~ATTR_GFX;
 898                                 break;
 899                         default:
 900                                 printf("esc unhandled charset: ESC ( %c\n", c);
 901                         }
 902                         term.esc = 0;
 903                 } else {
 904                         switch(c) {
 905                         case '[':
 906                                 term.esc |= ESC_CSI;
 907                                 break;
 908                         case ']':
 909                                 term.esc |= ESC_OSC;
 910                                 break;
 911                         case '(':
 912                                 term.esc |= ESC_ALTCHARSET;
 913                                 break;
 914                         case 'A':
 915                                 tmoveto(term.c.x, term.c.y-1);
 916                                 term.esc = 0;
 917                                 break;
 918                         case 'B':
 919                                 tmoveto(term.c.x, term.c.y+1);
 920                                 term.esc = 0;
 921                                 break;
 922                         case 'C':
 923                                 tmoveto(term.c.x+1, term.c.y);
 924                                 term.esc = 0;
 925                                 break;
 926                         case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
 927                                 tmoveto(term.c.x-1, term.c.y);
 928                                 term.esc = 0;
 929                                 break;
 930                         case 'E': /* NEL -- Next line */
 931                                 tnewline();
 932                                 term.esc = 0;
 933                                 break;
 934                         case 'M': /* RI -- Reverse index */
 935                                 if(term.c.y == term.top)
 936                                         tscrolldown(1);
 937                                 else
 938                                         tmoveto(term.c.x, term.c.y-1);
 939                                 term.esc = 0;
 940                                 break;
 941                         case 'c': /* RIS -- Reset to inital state */
 942                                 treset();
 943                                 term.esc = 0;
 944                                 break;
 945                         case '=': /* DECPAM */
 946                                 term.mode |= MODE_APPKEYPAD;
 947                                 term.esc = 0;
 948                                 break;
 949                         case '>': /* DECPNM */
 950                                 term.mode &= ~MODE_APPKEYPAD;
 951                                 term.esc = 0;
 952                                 break;
 953                         case '7':
 954                                 tcursor(CURSOR_SAVE);
 955                                 term.esc = 0;
 956                                 break;
 957                         case '8':
 958                                 tcursor(CURSOR_LOAD);
 959                                 term.esc = 0;
 960                                 break;
 961                         default:
 962                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
 963                                 term.esc = 0;
 964                         }
 965                 }
 966         } else {
 967                 switch(c) {
 968                 case '\t':
 969                         tputtab();
 970                         break;
 971                 case '\b':
 972                         tmovecursor(CURSOR_LEFT);
 973                         break;
 974                 case '\r':
 975                         tmoveto(0, term.c.y);
 976                         break;
 977                 case '\n':
 978                         tnewline();
 979                         break;
 980                 case '\a':
 981                         xbell();
 982                         break;
 983                 case '\033':
 984                         csireset();
 985                         term.esc = ESC_START;
 986                         break;
 987                 default:
 988                         tsetchar(c);
 989                         tmovecursor(CURSOR_RIGHT);
 990                         break;
 991                 }
 992         }
 993 }
 994
 995 void
 996 tputs(char *s, int len) {
 997         for(; len > 0; len--)
 998                 tputc(*s++);
 999 }
1000
1001 void
1002 tresize(int col, int row) {
1003         int i;
1004         int minrow = MIN(row, term.row);
1005         int mincol = MIN(col, term.col);
1006
1007         if(col < 1 || row < 1)
1008                 return;
1009
1010         for(i = row; i < term.row; i++)
1011                 free(term.line[i]);
1012         term.line = realloc(term.line, row * sizeof(Line));
1013         for(i = 0; i < minrow; i++) {
1014                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1015                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1016         }
1017         for(/* i == minrow */; i < row; i++)
1018                 term.line[i] = calloc(col, sizeof(Glyph));
1019
1020         LIMIT(term.c.x, 0, col-1);
1021         LIMIT(term.c.y, 0, row-1);
1022         LIMIT(term.top, 0, row-1);
1023         LIMIT(term.bot, 0, row-1);
1024
1025         term.bot = row-1;
1026         term.col = col, term.row = row;
1027 }
1028
1029 void
1030 xloadcols(void) {
1031         int i, r, g, b;
1032         XColor color;
1033         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1034         unsigned long white = WhitePixel(xw.dis, xw.scr);
1035
1036         for(i = 0; i < 16; i++) {
1037                 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1038                         dc.col[i] = white;
1039                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1040                 } else
1041                         dc.col[i] = color.pixel;
1042         }
1043
1044         /* same colors as xterm */
1045         for(r = 0; r < 6; r++)
1046                 for(g = 0; g < 6; g++)
1047                         for(b = 0; b < 6; b++) {
1048                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1049                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1050                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1051                                 if (!XAllocColor(xw.dis, cmap, &color)) {
1052                                         dc.col[i] = white;
1053                                         fprintf(stderr, "Could not allocate color %d\n", i);
1054                                 } else
1055                                         dc.col[i] = color.pixel;
1056                                 i++;
1057                         }
1058
1059         for(r = 0; r < 24; r++, i++) {
1060                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1061                 if (!XAllocColor(xw.dis, cmap, &color)) {
1062                         dc.col[i] = white;
1063                         fprintf(stderr, "Could not allocate color %d\n", i);
1064                 } else
1065                         dc.col[i] = color.pixel;
1066         }
1067 }
1068
1069 void
1070 xclear(int x1, int y1, int x2, int y2) {
1071         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1072         XFillRectangle(xw.dis, xw.buf, dc.gc,
1073                        x1 * xw.cw, y1 * xw.ch,
1074                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1075 }
1076
1077 void
1078 xhints(void)
1079 {
1080         XClassHint class = {TNAME, TNAME};
1081         XWMHints wm = {.flags = InputHint, .input = 1};
1082         XSizeHints size = {
1083                 .flags = PSize | PResizeInc | PBaseSize,
1084                 .height = xw.h,
1085                 .width = xw.w,
1086                 .height_inc = xw.ch,
1087                 .width_inc = xw.cw,
1088                 .base_height = 2*BORDER,
1089                 .base_width = 2*BORDER,
1090         };
1091         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1092 }
1093
1094 void
1095 xinit(void) {
1096         xw.dis = XOpenDisplay(NULL);
1097         xw.scr = XDefaultScreen(xw.dis);
1098         if(!xw.dis)
1099                 die("Can't open display\n");
1100
1101         /* font */
1102         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1103                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1104
1105         /* XXX: Assuming same size for bold font */
1106         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1107         xw.ch = dc.font->ascent + dc.font->descent;
1108
1109         /* colors */
1110         xloadcols();
1111
1112         term.c.attr.fg = DefaultFG;
1113         term.c.attr.bg = DefaultBG;
1114         term.c.attr.mode = ATTR_NULL;
1115         /* windows */
1116         xw.h = term.row * xw.ch + 2*BORDER;
1117         xw.w = term.col * xw.cw + 2*BORDER;
1118         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1119                         xw.w, xw.h, 0,
1120                         dc.col[DefaultBG],
1121                         dc.col[DefaultBG]);
1122         xw.bufw = xw.w - 2*BORDER;
1123         xw.bufh = xw.h - 2*BORDER;
1124         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1125         /* gc */
1126         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1127         XMapWindow(xw.dis, xw.win);
1128         xhints();
1129         XStoreName(xw.dis, xw.win, "st");
1130         XSync(xw.dis, 0);
1131 }
1132
1133 void
1134 xdraws(char *s, Glyph base, int x, int y, int len) {
1135         unsigned long xfg, xbg;
1136         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1137         int i;
1138
1139         if(base.mode & ATTR_REVERSE)
1140                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1141         else
1142                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1143
1144         XSetBackground(xw.dis, dc.gc, xbg);
1145         XSetForeground(xw.dis, dc.gc, xfg);
1146
1147         if(base.mode & ATTR_GFX)
1148                 for(i = 0; i < len; i++)
1149                         s[i] = gfx[(int)s[i]];
1150
1151         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1152         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1153
1154         if(base.mode & ATTR_UNDERLINE)
1155                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1156 }
1157
1158 void
1159 xcursor(int mode) {
1160         static int oldx = 0;
1161         static int oldy = 0;
1162         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1163
1164         LIMIT(oldx, 0, term.col-1);
1165         LIMIT(oldy, 0, term.row-1);
1166
1167         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1168                 g.c = term.line[term.c.y][term.c.x].c;
1169
1170         /* remove the old cursor */
1171         if(term.line[oldy][oldx].state & GLYPH_SET)
1172                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1173         else
1174                 xclear(oldx, oldy, oldx, oldy);
1175
1176         /* draw the new one */
1177         if(mode == CURSOR_DRAW) {
1178                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1179                 oldx = term.c.x, oldy = term.c.y;
1180         }
1181 }
1182
1183 #ifdef DEBUG
1184 /* basic drawing routines */
1185 void
1186 xdrawc(int x, int y, Glyph g) {
1187         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1188         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1189         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1190         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1191         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1192 }
1193
1194 void
1195 draw(int dummy) {
1196         int x, y;
1197
1198         xclear(0, 0, term.col-1, term.row-1);
1199         for(y = 0; y < term.row; y++)
1200                 for(x = 0; x < term.col; x++)
1201                         if(term.line[y][x].state & GLYPH_SET)
1202                                 xdrawc(x, y, term.line[y][x]);
1203
1204         if(!term.hidec)
1205                 xcursor(CURSOR_DRAW);
1206         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1207         XFlush(xw.dis);
1208 }
1209
1210 #else
1211 /* optimized drawing routine */
1212 void
1213 draw(int redraw_all) {
1214         int i, x, y, ox;
1215         Glyph base, new;
1216         char buf[DRAW_BUF_SIZ];
1217
1218         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1219         XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1220         for(y = 0; y < term.row; y++) {
1221                 base = term.line[y][0];
1222                 i = ox = 0;
1223                 for(x = 0; x < term.col; x++) {
1224                         new = term.line[y][x];
1225                         if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1226                                 buf[i++] = new.c;
1227                         else {
1228                                 xdraws(buf, base, ox, y, i);
1229                                 buf[0] = new.c;
1230                                 i = 1;
1231                                 ox = x;
1232                                 base = new;
1233                         }
1234                 }
1235                 xdraws(buf, base, ox, y, i);
1236         }
1237         xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1238         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1239         XFlush(xw.dis);
1240 }
1241
1242 #endif
1243
1244 void
1245 expose(XEvent *ev) {
1246         draw(SCREEN_REDRAW);
1247 }
1248
1249 char*
1250 kmap(KeySym k) {
1251         int i;
1252         for(i = 0; i < LEN(key); i++)
1253                 if(key[i].k == k)
1254                         return (char*)key[i].s;
1255         return NULL;
1256 }
1257
1258 void
1259 kpress(XEvent *ev) {
1260         XKeyEvent *e = &ev->xkey;
1261         KeySym ksym;
1262         char buf[32];
1263         char *customkey;
1264         int len;
1265         int meta;
1266         int shift;
1267
1268         meta = e->state & Mod1Mask;
1269         shift = e->state & ShiftMask;
1270         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1271
1272         if((customkey = kmap(ksym)))
1273                 ttywrite(customkey, strlen(customkey));
1274         else if(len > 0) {
1275                 buf[sizeof(buf)-1] = '\0';
1276                 if(meta && len == 1)
1277                         ttywrite("\033", 1);
1278                 ttywrite(buf, len);
1279         } else
1280                 switch(ksym) {
1281                 case XK_Up:
1282                 case XK_Down:
1283                 case XK_Left:
1284                 case XK_Right:
1285                         sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1286                         ttywrite(buf, 3);
1287                         break;
1288                 case XK_Insert:
1289                         if(shift)
1290                                 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1291                         break;
1292                 default:
1293                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1294                         break;
1295                 }
1296 }
1297
1298 void
1299 resize(XEvent *e) {
1300         int col, row;
1301
1302         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1303                 return;
1304
1305         xw.w = e->xconfigure.width;
1306         xw.h = e->xconfigure.height;
1307         xw.bufw = xw.w - 2*BORDER;
1308         xw.bufh = xw.h - 2*BORDER;
1309         col = xw.bufw / xw.cw;
1310         row = xw.bufh / xw.ch;
1311         tresize(col, row);
1312         ttyresize(col, row);
1313         XFreePixmap(xw.dis, xw.buf);
1314         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1315         draw(SCREEN_REDRAW);
1316 }
1317
1318 void
1319 run(void) {
1320         XEvent ev;
1321         fd_set rfd;
1322         int xfd = XConnectionNumber(xw.dis);
1323
1324         running = 1;
1325         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1326         XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1327
1328         while(running) {
1329                 FD_ZERO(&rfd);
1330                 FD_SET(cmdfd, &rfd);
1331                 FD_SET(xfd, &rfd);
1332                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1333                         if(errno == EINTR)
1334                                 continue;
1335                         die("select failed: %s\n", SERRNO);
1336                 }
1337                 if(FD_ISSET(cmdfd, &rfd)) {
1338                         ttyread();
1339                         draw(SCREEN_UPDATE);
1340                 }
1341                 while(XPending(xw.dis)) {
1342                         XNextEvent(xw.dis, &ev);
1343                         if(handler[ev.type])
1344                                 (handler[ev.type])(&ev);
1345                 }
1346         }
1347 }
1348
1349 int
1350 main(int argc, char *argv[]) {
1351         if(argc == 2 && !strncmp("-v", argv[1], 3))
1352                 die("st-" VERSION ", © 2009 st engineers\n");
1353         else if(argc != 1)
1354                 die("usage: st [-v]\n");
1355         setlocale(LC_CTYPE, "");
1356         tnew(80, 24);
1357         ttynew();
1358         xinit();
1359         run();
1360         return 0;
1361 }