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__) || defined(__NetBSD__)
  26  #include <util.h>
  27 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  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,
  50        CURSOR_SAVE, CURSOR_LOAD };
  51 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  52 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  53 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8 };
  54 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  55 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  56
  57 typedef struct {
  58         char c;     /* character code  */
  59         char mode;  /* attribute flags */
  60         int fg;     /* foreground      */
  61         int bg;     /* background      */
  62         char state; /* state flags     */
  63 } Glyph;
  64
  65 typedef Glyph* Line;
  66
  67 typedef struct {
  68         Glyph attr;      /* current char attributes */
  69         int x;
  70         int y;
  71         char state;
  72 } TCursor;
  73
  74 /* CSI Escape sequence structs */
  75 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  76 typedef struct {
  77         char buf[ESC_BUF_SIZ]; /* raw string */
  78         int len;                           /* raw string length */
  79         char priv;
  80         int arg[ESC_ARG_SIZ];
  81         int narg;                          /* nb of args */
  82         char mode;
  83 } CSIEscape;
  84
  85 /* Internal representation of the screen */
  86 typedef struct {
  87         int row;        /* nb row */
  88         int col;        /* nb col */
  89         Line* line;     /* screen */
  90         Line* alt;      /* alternate screen */
  91         TCursor c;      /* cursor */
  92         int top;        /* top    scroll limit */
  93         int bot;        /* bottom scroll limit */
  94         int mode;       /* terminal mode flags */
  95         int esc;        /* escape state flags */
  96         char title[ESC_TITLE_SIZ];
  97         int titlelen;
  98 } Term;
  99
 100 /* Purely graphic info */
 101 typedef struct {
 102         Display* dis;
 103         Window win;
 104         Pixmap buf;
 105         int scr;
 106         int w;  /* window width  */
 107         int h;  /* window height */
 108         int bufw; /* pixmap width  */
 109         int bufh; /* pixmap height */
 110         int ch; /* char height */
 111         int cw; /* char width  */
 112         int hasfocus;
 113 } XWindow;
 114
 115 typedef struct {
 116         KeySym k;
 117         char s[ESC_BUF_SIZ];
 118 } Key;
 119
 120 /* Drawing Context */
 121 typedef struct {
 122         unsigned long col[256];
 123         XFontStruct* font;
 124         XFontStruct* bfont;
 125         GC gc;
 126 } DC;
 127
 128 #include "config.h"
 129
 130 static void die(const char *errstr, ...);
 131 static void draw(int);
 132 static void execsh(void);
 133 static void sigchld(int);
 134 static void run(void);
 135
 136 static void csidump(void);
 137 static void csihandle(void);
 138 static void csiparse(void);
 139 static void csireset(void);
 140
 141 static void tclearregion(int, int, int, int);
 142 static void tcursor(int);
 143 static void tdeletechar(int);
 144 static void tdeleteline(int);
 145 static void tinsertblank(int);
 146 static void tinsertblankline(int);
 147 static void tmoveto(int, int);
 148 static void tnew(int, int);
 149 static void tnewline(void);
 150 static void tputtab(void);
 151 static void tputc(char);
 152 static void tputs(char*, int);
 153 static void treset(void);
 154 static void tresize(int, int);
 155 static void tscrollup(int);
 156 static void tscrolldown(int);
 157 static void tsetattr(int*, int);
 158 static void tsetchar(char);
 159 static void tsetscroll(int, int);
 160 static void tswapscreen(void);
 161
 162 static void ttynew(void);
 163 static void ttyread(void);
 164 static void ttyresize(int, int);
 165 static void ttywrite(const char *, size_t);
 166
 167 static void xdraws(char *, Glyph, int, int, int);
 168 static void xhints(void);
 169 static void xclear(int, int, int, int);
 170 static void xdrawcursor(void);
 171 static void xinit(void);
 172 static void xloadcols(void);
 173 static void xseturgency(int);
 174
 175 static void expose(XEvent *);
 176 static char* kmap(KeySym);
 177 static void kpress(XEvent *);
 178 static void resize(XEvent *);
 179 static void focus(XEvent *);
 180
 181
 182 static void (*handler[LASTEvent])(XEvent *) = {
 183         [KeyPress] = kpress,
 184         [Expose] = expose,
 185         [ConfigureNotify] = resize,
 186         [FocusIn] = focus,
 187         [FocusOut] = focus,
 188 };
 189
 190 /* Globals */
 191 static DC dc;
 192 static XWindow xw;
 193 static Term term;
 194 static CSIEscape escseq;
 195 static int cmdfd;
 196 static pid_t pid;
 197
 198 #ifdef DEBUG
 199 void
 200 tdump(void) {
 201         int row, col;
 202         Glyph c;
 203
 204         for(row = 0; row < term.row; row++) {
 205                 for(col = 0; col < term.col; col++) {
 206                         if(col == term.c.x && row == term.c.y)
 207                                 putchar('#');
 208                         else {
 209                                 c = term.line[row][col];
 210                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 211                         }
 212                 }
 213                 putchar('\n');
 214         }
 215 }
 216 #endif
 217
 218 void
 219 die(const char *errstr, ...) {
 220         va_list ap;
 221
 222         va_start(ap, errstr);
 223         vfprintf(stderr, errstr, ap);
 224         va_end(ap);
 225         exit(EXIT_FAILURE);
 226 }
 227
 228 void
 229 execsh(void) {
 230         char *args[3] = {getenv("SHELL"), "-i", NULL};
 231         DEFAULT(args[0], "/bin/sh"); /* if getenv() failed */
 232         putenv("TERM=" TNAME);
 233         execvp(args[0], args);
 234 }
 235
 236 void
 237 sigchld(int a) {
 238         int stat = 0;
 239         if(waitpid(pid, &stat, 0) < 0)
 240                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 241         if(WIFEXITED(stat))
 242                 exit(WEXITSTATUS(stat));
 243         else
 244                 exit(EXIT_FAILURE);
 245 }
 246
 247 void
 248 ttynew(void) {
 249         int m, s;
 250
 251         /* seems to work fine on linux, openbsd and freebsd */
 252         struct winsize w = {term.row, term.col, 0, 0};
 253         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 254                 die("openpty failed: %s\n", SERRNO);
 255
 256         switch(pid = fork()) {
 257         case -1:
 258                 die("fork failed\n");
 259                 break;
 260         case 0:
 261                 setsid(); /* create a new process group */
 262                 dup2(s, STDIN_FILENO);
 263                 dup2(s, STDOUT_FILENO);
 264                 dup2(s, STDERR_FILENO);
 265                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 266                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 267                 close(s);
 268                 close(m);
 269                 execsh();
 270                 break;
 271         default:
 272                 close(s);
 273                 cmdfd = m;
 274                 signal(SIGCHLD, sigchld);
 275         }
 276 }
 277
 278 void
 279 dump(char c) {
 280         static int col;
 281         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 282         if(++col % 10 == 0)
 283                 fprintf(stderr, "\n");
 284 }
 285
 286 void
 287 ttyread(void) {
 288         char buf[BUFSIZ] = {0};
 289         int ret;
 290
 291         if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
 292                 die("Couldn't read from shell: %s\n", SERRNO);
 293         else
 294                 tputs(buf, ret);
 295 }
 296
 297 void
 298 ttywrite(const char *s, size_t n) {
 299         if(write(cmdfd, s, n) == -1)
 300                 die("write error on tty: %s\n", SERRNO);
 301 }
 302
 303 void
 304 ttyresize(int x, int y) {
 305         struct winsize w;
 306
 307         w.ws_row = term.row;
 308         w.ws_col = term.col;
 309         w.ws_xpixel = w.ws_ypixel = 0;
 310         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 311                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 312 }
 313
 314 void
 315 tcursor(int mode) {
 316         static TCursor c;
 317
 318         if(mode == CURSOR_SAVE)
 319                 c = term.c;
 320         else if(mode == CURSOR_LOAD)
 321                 term.c = c, tmoveto(c.x, c.y);
 322 }
 323
 324 void
 325 treset(void) {
 326         term.c = (TCursor){{
 327                 .mode = ATTR_NULL,
 328                 .fg = DefaultFG,
 329                 .bg = DefaultBG
 330         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 331
 332         term.top = 0, term.bot = term.row - 1;
 333         term.mode = MODE_WRAP;
 334         tclearregion(0, 0, term.col-1, term.row-1);
 335 }
 336
 337 void
 338 tnew(int col, int row) {
 339         /* set screen size */
 340         term.row = row, term.col = col;
 341         term.line = malloc(term.row * sizeof(Line));
 342         term.alt  = malloc(term.row * sizeof(Line));
 343         for(row = 0 ; row < term.row; row++) {
 344                 term.line[row] = malloc(term.col * sizeof(Glyph));
 345                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 346         }
 347         /* setup screen */
 348         treset();
 349 }
 350
 351 void
 352 tswapscreen(void) {
 353         Line* tmp = term.line;
 354         term.line = term.alt;
 355         term.alt = tmp;
 356         term.mode ^= MODE_ALTSCREEN;
 357 }
 358
 359 void
 360 tscrolldown (int n) {
 361         int i;
 362         Line temp;
 363
 364         LIMIT(n, 0, term.bot-term.top+1);
 365
 366         for(i = 0; i < n; i++)
 367                 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
 368
 369         for(i = term.bot; i >= term.top+n; i--) {
 370                 temp = term.line[i];
 371                 term.line[i] = term.line[i-n];
 372                 term.line[i-n] = temp;
 373         }
 374 }
 375
 376 void
 377 tscrollup (int n) {
 378         int i;
 379         Line temp;
 380         LIMIT(n, 0, term.bot-term.top+1);
 381
 382         for(i = 0; i < n; i++)
 383                 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
 384
 385         for(i = term.top; i <= term.bot-n; i++) {
 386                  temp = term.line[i];
 387                  term.line[i] = term.line[i+n];
 388                  term.line[i+n] = temp;
 389         }
 390 }
 391
 392 void
 393 tnewline(void) {
 394         int y = term.c.y + 1;
 395         if(y > term.bot)
 396                 tscrollup(1), y = term.bot;
 397         tmoveto(0, y);
 398 }
 399
 400 void
 401 csiparse(void) {
 402         /* int noarg = 1; */
 403         char *p = escseq.buf;
 404
 405         escseq.narg = 0;
 406         if(*p == '?')
 407                 escseq.priv = 1, p++;
 408
 409         while(p < escseq.buf+escseq.len) {
 410                 while(isdigit(*p)) {
 411                         escseq.arg[escseq.narg] *= 10;
 412                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 413                 }
 414                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 415                         escseq.narg++, p++;
 416                 else {
 417                         escseq.mode = *p;
 418                         escseq.narg++;
 419                         return;
 420                 }
 421         }
 422 }
 423
 424 void
 425 tmoveto(int x, int y) {
 426         LIMIT(x, 0, term.col-1);
 427         LIMIT(y, 0, term.row-1);
 428         term.c.state &= ~CURSOR_WRAPNEXT;
 429         term.c.x = x;
 430         term.c.y = y;
 431 }
 432
 433 void
 434 tsetchar(char c) {
 435         term.line[term.c.y][term.c.x] = term.c.attr;
 436         term.line[term.c.y][term.c.x].c = c;
 437         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 438 }
 439
 440 void
 441 tclearregion(int x1, int y1, int x2, int y2) {
 442         int y, temp;
 443
 444         if(x1 > x2)
 445                 temp = x1, x1 = x2, x2 = temp;
 446         if(y1 > y2)
 447                 temp = y1, y1 = y2, y2 = temp;
 448
 449         LIMIT(x1, 0, term.col-1);
 450         LIMIT(x2, 0, term.col-1);
 451         LIMIT(y1, 0, term.row-1);
 452         LIMIT(y2, 0, term.row-1);
 453
 454         for(y = y1; y <= y2; y++)
 455                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 456 }
 457
 458 void
 459 tdeletechar(int n) {
 460         int src = term.c.x + n;
 461         int dst = term.c.x;
 462         int size = term.col - src;
 463
 464         if(src >= term.col) {
 465                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 466                 return;
 467         }
 468         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 469         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 470 }
 471
 472 void
 473 tinsertblank(int n) {
 474         int src = term.c.x;
 475         int dst = src + n;
 476         int size = term.col - dst;
 477
 478         if(dst >= term.col) {
 479                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 480                 return;
 481         }
 482         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 483         tclearregion(src, term.c.y, dst - 1, term.c.y);
 484 }
 485
 486 void
 487 tinsertblankline(int n) {
 488         int i;
 489         Line blank;
 490         int bot = term.bot;
 491
 492         if(term.c.y > term.bot)
 493                 bot = term.row - 1;
 494         else if(term.c.y < term.top)
 495                 bot = term.top - 1;
 496         if(term.c.y + n >= bot) {
 497                 tclearregion(0, term.c.y, term.col-1, bot);
 498                 return;
 499         }
 500         for(i = bot; i >= term.c.y+n; i--) {
 501                 /* swap deleted line <-> blanked line */
 502                 blank = term.line[i];
 503                 term.line[i] = term.line[i-n];
 504                 term.line[i-n] = blank;
 505                 /* blank it */
 506                 memset(blank, 0, term.col * sizeof(Glyph));
 507         }
 508 }
 509
 510 void
 511 tdeleteline(int n) {
 512         int i;
 513         Line blank;
 514         int bot = term.bot;
 515
 516         if(term.c.y > term.bot)
 517                 bot = term.row - 1;
 518         else if(term.c.y < term.top)
 519                 bot = term.top - 1;
 520         if(term.c.y + n >= bot) {
 521                 tclearregion(0, term.c.y, term.col-1, bot);
 522                 return;
 523         }
 524         for(i = term.c.y; i <= bot-n; i++) {
 525                 /* swap deleted line <-> blanked line */
 526                 blank = term.line[i];
 527                 term.line[i] = term.line[i+n];
 528                 term.line[i+n] = blank;
 529                 /* blank it */
 530                 memset(blank, 0, term.col * sizeof(Glyph));
 531         }
 532 }
 533
 534 void
 535 tsetattr(int *attr, int l) {
 536         int i;
 537
 538         for(i = 0; i < l; i++) {
 539                 switch(attr[i]) {
 540                 case 0:
 541                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 542                         term.c.attr.fg = DefaultFG;
 543                         term.c.attr.bg = DefaultBG;
 544                         break;
 545                 case 1:
 546                         term.c.attr.mode |= ATTR_BOLD;
 547                         break;
 548                 case 4:
 549                         term.c.attr.mode |= ATTR_UNDERLINE;
 550                         break;
 551                 case 7:
 552                         term.c.attr.mode |= ATTR_REVERSE;
 553                         break;
 554                 case 22:
 555                         term.c.attr.mode &= ~ATTR_BOLD;
 556                         break;
 557                 case 24:
 558                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 559                         break;
 560                 case 27:
 561                         term.c.attr.mode &= ~ATTR_REVERSE;
 562                         break;
 563                 case 38:
 564                         if (i + 2 < l && attr[i + 1] == 5) {
 565                                 i += 2;
 566                                 if (BETWEEN(attr[i], 0, 255))
 567                                         term.c.attr.fg = attr[i];
 568                                 else
 569                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 570                         }
 571                         else
 572                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 573                         break;
 574                 case 39:
 575                         term.c.attr.fg = DefaultFG;
 576                         break;
 577                 case 48:
 578                         if (i + 2 < l && attr[i + 1] == 5) {
 579                                 i += 2;
 580                                 if (BETWEEN(attr[i], 0, 255))
 581                                         term.c.attr.bg = attr[i];
 582                                 else
 583                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 584                         }
 585                         else
 586                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 587                         break;
 588                 case 49:
 589                         term.c.attr.bg = DefaultBG;
 590                         break;
 591                 default:
 592                         if(BETWEEN(attr[i], 30, 37))
 593                                 term.c.attr.fg = attr[i] - 30;
 594                         else if(BETWEEN(attr[i], 40, 47))
 595                                 term.c.attr.bg = attr[i] - 40;
 596                         else if(BETWEEN(attr[i], 90, 97))
 597                                 term.c.attr.fg = attr[i] - 90 + 8;
 598                         else if(BETWEEN(attr[i], 100, 107))
 599                                 term.c.attr.fg = attr[i] - 100 + 8;
 600                         else
 601                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 602                         break;
 603                 }
 604         }
 605 }
 606
 607 void
 608 tsetscroll(int t, int b) {
 609         int temp;
 610
 611         LIMIT(t, 0, term.row-1);
 612         LIMIT(b, 0, term.row-1);
 613         if(t > b) {
 614                 temp = t;
 615                 t = b;
 616                 b = temp;
 617         }
 618         term.top = t;
 619         term.bot = b;
 620 }
 621
 622 void
 623 csihandle(void) {
 624         switch(escseq.mode) {
 625         default:
 626         unknown:
 627                 printf("erresc: unknown csi ");
 628                 csidump();
 629                 /* die(""); */
 630                 break;
 631         case '@': /* ICH -- Insert <n> blank char */
 632                 DEFAULT(escseq.arg[0], 1);
 633                 tinsertblank(escseq.arg[0]);
 634                 break;
 635         case 'A': /* CUU -- Cursor <n> Up */
 636         case 'e':
 637                 DEFAULT(escseq.arg[0], 1);
 638                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 639                 break;
 640         case 'B': /* CUD -- Cursor <n> Down */
 641                 DEFAULT(escseq.arg[0], 1);
 642                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 643                 break;
 644         case 'C': /* CUF -- Cursor <n> Forward */
 645         case 'a':
 646                 DEFAULT(escseq.arg[0], 1);
 647                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 648                 break;
 649         case 'D': /* CUB -- Cursor <n> Backward */
 650                 DEFAULT(escseq.arg[0], 1);
 651                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 652                 break;
 653         case 'E': /* CNL -- Cursor <n> Down and first col */
 654                 DEFAULT(escseq.arg[0], 1);
 655                 tmoveto(0, term.c.y+escseq.arg[0]);
 656                 break;
 657         case 'F': /* CPL -- Cursor <n> Up and first col */
 658                 DEFAULT(escseq.arg[0], 1);
 659                 tmoveto(0, term.c.y-escseq.arg[0]);
 660                 break;
 661         case 'G': /* CHA -- Move to <col> */
 662         case '`': /* XXX: HPA -- same? */
 663                 DEFAULT(escseq.arg[0], 1);
 664                 tmoveto(escseq.arg[0]-1, term.c.y);
 665                 break;
 666         case 'H': /* CUP -- Move to <row> <col> */
 667         case 'f': /* XXX: HVP -- same? */
 668                 DEFAULT(escseq.arg[0], 1);
 669                 DEFAULT(escseq.arg[1], 1);
 670                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 671                 break;
 672         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 673         case 'J': /* ED -- Clear screen */
 674                 switch(escseq.arg[0]) {
 675                 case 0: /* below */
 676                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 677                         break;
 678                 case 1: /* above */
 679                         tclearregion(0, 0, term.c.x, term.c.y);
 680                         break;
 681                 case 2: /* all */
 682                         tclearregion(0, 0, term.col-1, term.row-1);
 683                         break;
 684                 case 3: /* XXX: erase saved lines (xterm) */
 685                 default:
 686                         goto unknown;
 687                 }
 688                 break;
 689         case 'K': /* EL -- Clear line */
 690                 switch(escseq.arg[0]) {
 691                 case 0: /* right */
 692                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 693                         break;
 694                 case 1: /* left */
 695                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 696                         break;
 697                 case 2: /* all */
 698                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 699                         break;
 700                 }
 701                 break;
 702         case 'S': /* SU -- Scroll <n> line up */
 703                 DEFAULT(escseq.arg[0], 1);
 704                 tscrollup(escseq.arg[0]);
 705                 break;
 706         case 'T': /* SD -- Scroll <n> line down */
 707                 DEFAULT(escseq.arg[0], 1);
 708                 tscrolldown(escseq.arg[0]);
 709                 break;
 710         case 'L': /* IL -- Insert <n> blank lines */
 711                 DEFAULT(escseq.arg[0], 1);
 712                 tinsertblankline(escseq.arg[0]);
 713                 break;
 714         case 'l': /* RM -- Reset Mode */
 715                 if(escseq.priv) {
 716                         switch(escseq.arg[0]) {
 717                         case 1:
 718                                 term.mode &= ~MODE_APPKEYPAD;
 719                                 break;
 720                         case 7:
 721                                 term.mode &= ~MODE_WRAP;
 722                                 break;
 723                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 724                                 break;
 725                         case 25:
 726                                 term.c.state |= CURSOR_HIDE;
 727                                 break;
 728                         case 1047:
 729                                 if(IS_SET(MODE_ALTSCREEN)) {
 730                                         tclearregion(0, 0, term.col-1, term.row-1);
 731                                         tswapscreen();
 732                                 }
 733                                 break;
 734                         case 1048:
 735                                 tcursor(CURSOR_LOAD);
 736                                 break;
 737                         case 1049:
 738                                 tcursor(CURSOR_LOAD);
 739                                 if(IS_SET(MODE_ALTSCREEN)) {
 740                                         tclearregion(0, 0, term.col-1, term.row-1);
 741                                         tswapscreen();
 742                                 }
 743                                 break;
 744                         default:
 745                                 goto unknown;
 746                         }
 747                 } else {
 748                         switch(escseq.arg[0]) {
 749                         case 4:
 750                                 term.mode &= ~MODE_INSERT;
 751                                 break;
 752                         default:
 753                                 goto unknown;
 754                         }
 755                 }
 756                 break;
 757         case 'M': /* DL -- Delete <n> lines */
 758                 DEFAULT(escseq.arg[0], 1);
 759                 tdeleteline(escseq.arg[0]);
 760                 break;
 761         case 'X': /* ECH -- Erase <n> char */
 762                 DEFAULT(escseq.arg[0], 1);
 763                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 764                 break;
 765         case 'P': /* DCH -- Delete <n> char */
 766                 DEFAULT(escseq.arg[0], 1);
 767                 tdeletechar(escseq.arg[0]);
 768                 break;
 769         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 770         case 'd': /* VPA -- Move to <row> */
 771                 DEFAULT(escseq.arg[0], 1);
 772                 tmoveto(term.c.x, escseq.arg[0]-1);
 773                 break;
 774         case 'h': /* SM -- Set terminal mode */
 775                 if(escseq.priv) {
 776                         switch(escseq.arg[0]) {
 777                         case 1:
 778                                 term.mode |= MODE_APPKEYPAD;
 779                                 break;
 780                         case 7:
 781                                 term.mode |= MODE_WRAP;
 782                                 break;
 783                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 784                                 break;
 785                         case 25:
 786                                 term.c.state &= ~CURSOR_HIDE;
 787                                 break;
 788                         case 1047:
 789                                 if(IS_SET(MODE_ALTSCREEN))
 790                                         tclearregion(0, 0, term.col-1, term.row-1);
 791                                 else
 792                                         tswapscreen();
 793                                 break;
 794                         case 1048:
 795                                 tcursor(CURSOR_SAVE);
 796                                 break;
 797                         case 1049:
 798                                 tcursor(CURSOR_SAVE);
 799                                 if(IS_SET(MODE_ALTSCREEN))
 800                                         tclearregion(0, 0, term.col-1, term.row-1);
 801                                 else
 802                                         tswapscreen();
 803                                 break;
 804                         default: goto unknown;
 805                         }
 806                 } else {
 807                         switch(escseq.arg[0]) {
 808                         case 4:
 809                                 term.mode |= MODE_INSERT;
 810                                 break;
 811                         default: goto unknown;
 812                         }
 813                 };
 814                 break;
 815         case 'm': /* SGR -- Terminal attribute (color) */
 816                 tsetattr(escseq.arg, escseq.narg);
 817                 break;
 818         case 'r': /* DECSTBM -- Set Scrolling Region */
 819                 if(escseq.priv)
 820                         goto unknown;
 821                 else {
 822                         DEFAULT(escseq.arg[0], 1);
 823                         DEFAULT(escseq.arg[1], term.row);
 824                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 825                         tmoveto(0, 0);
 826                 }
 827                 break;
 828         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 829                 tcursor(CURSOR_SAVE);
 830                 break;
 831         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 832                 tcursor(CURSOR_LOAD);
 833                 break;
 834         }
 835 }
 836
 837 void
 838 csidump(void) {
 839         int i;
 840         printf("ESC [ %s", escseq.priv ? "? " : "");
 841         if(escseq.narg)
 842                 for(i = 0; i < escseq.narg; i++)
 843                         printf("%d ", escseq.arg[i]);
 844         if(escseq.mode)
 845                 putchar(escseq.mode);
 846         putchar('\n');
 847 }
 848
 849 void
 850 csireset(void) {
 851         memset(&escseq, 0, sizeof(escseq));
 852 }
 853
 854 void
 855 tputtab(void) {
 856         int space = TAB - term.c.x % TAB;
 857         tmoveto(term.c.x + space, term.c.y);
 858 }
 859
 860 void
 861 tputc(char c) {
 862         if(term.esc & ESC_START) {
 863                 if(term.esc & ESC_CSI) {
 864                         escseq.buf[escseq.len++] = c;
 865                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 866                                 term.esc = 0;
 867                                 csiparse(), csihandle();
 868                         }
 869                 } else if(term.esc & ESC_OSC) {
 870                         if(c == ';') {
 871                                 term.titlelen = 0;
 872                                 term.esc = ESC_START | ESC_TITLE;
 873                         }
 874                 } else if(term.esc & ESC_TITLE) {
 875                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 876                                 term.esc = 0;
 877                                 term.title[term.titlelen] = '\0';
 878                                 XStoreName(xw.dis, xw.win, term.title);
 879                         } else {
 880                                 term.title[term.titlelen++] = c;
 881                         }
 882                 } else if(term.esc & ESC_ALTCHARSET) {
 883                         switch(c) {
 884                         case '0': /* Line drawing crap */
 885                                 term.c.attr.mode |= ATTR_GFX;
 886                                 break;
 887                         case 'B': /* Back to regular text */
 888                                 term.c.attr.mode &= ~ATTR_GFX;
 889                                 break;
 890                         default:
 891                                 printf("esc unhandled charset: ESC ( %c\n", c);
 892                         }
 893                         term.esc = 0;
 894                 } else {
 895                         switch(c) {
 896                         case '[':
 897                                 term.esc |= ESC_CSI;
 898                                 break;
 899                         case ']':
 900                                 term.esc |= ESC_OSC;
 901                                 break;
 902                         case '(':
 903                                 term.esc |= ESC_ALTCHARSET;
 904                                 break;
 905                         case 'D': /* IND -- Linefeed */
 906                                 if(term.c.y == term.bot)
 907                                         tscrollup(1);
 908                                 else
 909                                         tmoveto(term.c.x, term.c.y+1);
 910                                 term.esc = 0;
 911                                 break;
 912                         case 'E': /* NEL -- Next line */
 913                                 tnewline();
 914                                 term.esc = 0;
 915                                 break;
 916                         case 'M': /* RI -- Reverse index */
 917                                 if(term.c.y == term.top)
 918                                         tscrolldown(1);
 919                                 else
 920                                         tmoveto(term.c.x, term.c.y-1);
 921                                 term.esc = 0;
 922                                 break;
 923                         case 'c': /* RIS -- Reset to inital state */
 924                                 treset();
 925                                 term.esc = 0;
 926                                 break;
 927                         case '=': /* DECPAM -- Application keypad */
 928                                 term.mode |= MODE_APPKEYPAD;
 929                                 term.esc = 0;
 930                                 break;
 931                         case '>': /* DECPNM -- Normal keypad */
 932                                 term.mode &= ~MODE_APPKEYPAD;
 933                                 term.esc = 0;
 934                                 break;
 935                         case '7': /* DECSC -- Save Cursor*/
 936                                 tcursor(CURSOR_SAVE);
 937                                 term.esc = 0;
 938                                 break;
 939                         case '8': /* DECRC -- Restore Cursor */
 940                                 tcursor(CURSOR_LOAD);
 941                                 term.esc = 0;
 942                                 break;
 943                         default:
 944                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
 945                                 term.esc = 0;
 946                         }
 947                 }
 948         } else {
 949                 switch(c) {
 950                 case '\t':
 951                         tputtab();
 952                         break;
 953                 case '\b':
 954                         tmoveto(term.c.x-1, term.c.y);
 955                         break;
 956                 case '\r':
 957                         tmoveto(0, term.c.y);
 958                         break;
 959                 case '\n':
 960                         tnewline();
 961                         break;
 962                 case '\a':
 963                         if(!xw.hasfocus)
 964                                 xseturgency(1);
 965                         break;
 966                 case '\033':
 967                         csireset();
 968                         term.esc = ESC_START;
 969                         break;
 970                 default:
 971                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
 972                                 tnewline();
 973                         tsetchar(c);
 974                         if(term.c.x+1 < term.col)
 975                                 tmoveto(term.c.x+1, term.c.y);
 976                         else
 977                                 term.c.state |= CURSOR_WRAPNEXT;
 978                         break;
 979                 }
 980         }
 981 }
 982
 983 void
 984 tputs(char *s, int len) {
 985         for(; len > 0; len--)
 986                 tputc(*s++);
 987 }
 988
 989 void
 990 tresize(int col, int row) {
 991         int i;
 992         int minrow = MIN(row, term.row);
 993         int mincol = MIN(col, term.col);
 994
 995         if(col < 1 || row < 1)
 996                 return;
 997
 998         /* free uneeded rows */
 999         for(i = row; i < term.row; i++) {
1000                 free(term.line[i]);
1001                 free(term.alt[i]);
1002         }
1003
1004         /* resize to new height */
1005         term.line = realloc(term.line, row * sizeof(Line));
1006         term.line = realloc(term.alt,  row * sizeof(Line));
1007
1008         /* resize each row to new width, zero-pad if needed */
1009         for(i = 0; i < minrow; i++) {
1010                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1011                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1012                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1013                 memset(term.alt[i]  + mincol, 0, (col - mincol) * sizeof(Glyph));
1014         }
1015
1016         /* allocate any new rows */
1017         for(/* i == minrow */; i < row; i++) {
1018                 term.line[i] = calloc(col, sizeof(Glyph));
1019                 term.alt [i] = calloc(col, sizeof(Glyph));
1020         }
1021
1022         /* update terminal size */
1023         term.col = col, term.row = row;
1024         /* make use of the LIMIT in tmoveto */
1025         tmoveto(term.c.x, term.c.y);
1026         /* reset scrolling region */
1027         tsetscroll(0, row-1);
1028 }
1029
1030 void
1031 xloadcols(void) {
1032         int i, r, g, b;
1033         XColor color;
1034         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1035         unsigned long white = WhitePixel(xw.dis, xw.scr);
1036
1037         for(i = 0; i < 16; i++) {
1038                 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1039                         dc.col[i] = white;
1040                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1041                 } else
1042                         dc.col[i] = color.pixel;
1043         }
1044
1045         /* same colors as xterm */
1046         for(r = 0; r < 6; r++)
1047                 for(g = 0; g < 6; g++)
1048                         for(b = 0; b < 6; b++) {
1049                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1050                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1051                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1052                                 if (!XAllocColor(xw.dis, cmap, &color)) {
1053                                         dc.col[i] = white;
1054                                         fprintf(stderr, "Could not allocate color %d\n", i);
1055                                 } else
1056                                         dc.col[i] = color.pixel;
1057                                 i++;
1058                         }
1059
1060         for(r = 0; r < 24; r++, i++) {
1061                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1062                 if (!XAllocColor(xw.dis, cmap, &color)) {
1063                         dc.col[i] = white;
1064                         fprintf(stderr, "Could not allocate color %d\n", i);
1065                 } else
1066                         dc.col[i] = color.pixel;
1067         }
1068 }
1069
1070 void
1071 xclear(int x1, int y1, int x2, int y2) {
1072         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1073         XFillRectangle(xw.dis, xw.buf, dc.gc,
1074                        x1 * xw.cw, y1 * xw.ch,
1075                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1076 }
1077
1078 void
1079 xhints(void)
1080 {
1081         XClassHint class = {TNAME, TNAME};
1082         XWMHints wm = {.flags = InputHint, .input = 1};
1083         XSizeHints size = {
1084                 .flags = PSize | PResizeInc | PBaseSize,
1085                 .height = xw.h,
1086                 .width = xw.w,
1087                 .height_inc = xw.ch,
1088                 .width_inc = xw.cw,
1089                 .base_height = 2*BORDER,
1090                 .base_width = 2*BORDER,
1091         };
1092         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1093 }
1094
1095 void
1096 xinit(void) {
1097         if(!(xw.dis = XOpenDisplay(NULL)))
1098                 die("Can't open display\n");
1099         xw.scr = XDefaultScreen(xw.dis);
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         /* windows */
1113         xw.h = term.row * xw.ch + 2*BORDER;
1114         xw.w = term.col * xw.cw + 2*BORDER;
1115         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1116                         xw.w, xw.h, 0,
1117                         dc.col[DefaultBG],
1118                         dc.col[DefaultBG]);
1119         xw.bufw = xw.w - 2*BORDER;
1120         xw.bufh = xw.h - 2*BORDER;
1121         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1122         /* gc */
1123         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1124         XMapWindow(xw.dis, xw.win);
1125         xhints();
1126         XStoreName(xw.dis, xw.win, "st");
1127         XSync(xw.dis, 0);
1128 }
1129
1130 void
1131 xdraws(char *s, Glyph base, int x, int y, int len) {
1132         unsigned long xfg, xbg;
1133         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1134         int i;
1135
1136         if(base.mode & ATTR_REVERSE)
1137                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1138         else
1139                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1140
1141         XSetBackground(xw.dis, dc.gc, xbg);
1142         XSetForeground(xw.dis, dc.gc, xfg);
1143
1144         if(base.mode & ATTR_GFX)
1145                 for(i = 0; i < len; i++)
1146                         s[i] = gfx[(int)s[i]];
1147
1148         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1149         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1150
1151         if(base.mode & ATTR_UNDERLINE)
1152                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1153 }
1154
1155 void
1156 xdrawcursor(void) {
1157         static int oldx = 0;
1158         static int oldy = 0;
1159         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1160
1161         LIMIT(oldx, 0, term.col-1);
1162         LIMIT(oldy, 0, term.row-1);
1163
1164         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1165                 g.c = term.line[term.c.y][term.c.x].c;
1166
1167         /* remove the old cursor */
1168         if(term.line[oldy][oldx].state & GLYPH_SET)
1169                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1170         else
1171                 xclear(oldx, oldy, oldx, oldy);
1172
1173         /* draw the new one */
1174         if(!(term.c.state & CURSOR_HIDE) && xw.hasfocus) {
1175                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1176                 oldx = term.c.x, oldy = term.c.y;
1177         }
1178 }
1179
1180 #ifdef DEBUG
1181 /* basic drawing routines */
1182 void
1183 xdrawc(int x, int y, Glyph g) {
1184         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1185         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1186         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1187         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1188         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1189 }
1190
1191 void
1192 draw(int dummy) {
1193         int x, y;
1194
1195         xclear(0, 0, term.col-1, term.row-1);
1196         for(y = 0; y < term.row; y++)
1197                 for(x = 0; x < term.col; x++)
1198                         if(term.line[y][x].state & GLYPH_SET)
1199                                 xdrawc(x, y, term.line[y][x]);
1200
1201         xdrawcursor();
1202         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1203         XFlush(xw.dis);
1204 }
1205
1206 #else
1207 /* optimized drawing routine */
1208 void
1209 draw(int redraw_all) {
1210         int i, x, y, ox;
1211         Glyph base, new;
1212         char buf[DRAW_BUF_SIZ];
1213
1214         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1215         XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.bufw, xw.bufh);
1216         for(y = 0; y < term.row; y++) {
1217                 base = term.line[y][0];
1218                 i = ox = 0;
1219                 for(x = 0; x < term.col; x++) {
1220                         new = term.line[y][x];
1221                         if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1222                                                 i >= DRAW_BUF_SIZ)) {
1223                                 xdraws(buf, base, ox, y, i);
1224                                 i = 0;
1225                         }
1226                         if(new.state & GLYPH_SET) {
1227                                 if(i == 0) {
1228                                         ox = x;
1229                                         base = new;
1230                                 }
1231                                 buf[i++] = new.c;
1232                         }
1233                 }
1234                 if(i > 0)
1235                         xdraws(buf, base, ox, y, i);
1236         }
1237         xdrawcursor();
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 void
1250 xseturgency(int add) {
1251         XWMHints *h = XGetWMHints(xw.dis, xw.win);
1252         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1253         XSetWMHints(xw.dis, xw.win, h);
1254         XFree(h);
1255 }
1256
1257 void
1258 focus(XEvent *ev) {
1259         if((xw.hasfocus = ev->type == FocusIn))
1260                 xseturgency(0);
1261         draw(SCREEN_UPDATE);
1262 }
1263
1264 char*
1265 kmap(KeySym k) {
1266         int i;
1267         for(i = 0; i < LEN(key); i++)
1268                 if(key[i].k == k)
1269                         return (char*)key[i].s;
1270         return NULL;
1271 }
1272
1273 void
1274 kpress(XEvent *ev) {
1275         XKeyEvent *e = &ev->xkey;
1276         KeySym ksym;
1277         char buf[32];
1278         char *customkey;
1279         int len;
1280         int meta;
1281         int shift;
1282
1283         meta = e->state & Mod1Mask;
1284         shift = e->state & ShiftMask;
1285         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1286
1287         if((customkey = kmap(ksym)))
1288                 ttywrite(customkey, strlen(customkey));
1289         else if(len > 0) {
1290                 buf[sizeof(buf)-1] = '\0';
1291                 if(meta && len == 1)
1292                         ttywrite("\033", 1);
1293                 ttywrite(buf, len);
1294         } else
1295                 switch(ksym) {
1296                 case XK_Up:
1297                 case XK_Down:
1298                 case XK_Left:
1299                 case XK_Right:
1300                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1301                         ttywrite(buf, 3);
1302                         break;
1303                 case XK_Insert:
1304                         if(shift)
1305                                 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1306                         break;
1307                 default:
1308                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1309                         break;
1310                 }
1311 }
1312
1313 void
1314 resize(XEvent *e) {
1315         int col, row;
1316
1317         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1318                 return;
1319
1320         xw.w = e->xconfigure.width;
1321         xw.h = e->xconfigure.height;
1322         xw.bufw = xw.w - 2*BORDER;
1323         xw.bufh = xw.h - 2*BORDER;
1324         col = xw.bufw / xw.cw;
1325         row = xw.bufh / xw.ch;
1326         tresize(col, row);
1327         ttyresize(col, row);
1328         XFreePixmap(xw.dis, xw.buf);
1329         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1330         draw(SCREEN_REDRAW);
1331 }
1332
1333 void
1334 run(void) {
1335         XEvent ev;
1336         fd_set rfd;
1337         int xfd = XConnectionNumber(xw.dis);
1338         long mask = ExposureMask | KeyPressMask | StructureNotifyMask | FocusChangeMask;
1339
1340         XSelectInput(xw.dis, xw.win, mask);
1341         XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1342
1343         while(1) {
1344                 FD_ZERO(&rfd);
1345                 FD_SET(cmdfd, &rfd);
1346                 FD_SET(xfd, &rfd);
1347                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1348                         if(errno == EINTR)
1349                                 continue;
1350                         die("select failed: %s\n", SERRNO);
1351                 }
1352                 if(FD_ISSET(cmdfd, &rfd)) {
1353                         ttyread();
1354                         draw(SCREEN_UPDATE);
1355                 }
1356                 while(XPending(xw.dis)) {
1357                         XNextEvent(xw.dis, &ev);
1358                         if(handler[ev.type])
1359                                 (handler[ev.type])(&ev);
1360                 }
1361         }
1362 }
1363
1364 int
1365 main(int argc, char *argv[]) {
1366         if(argc == 2 && !strncmp("-v", argv[1], 3))
1367                 die("st-" VERSION ", (c) 2010 st engineers\n");
1368         else if(argc != 1)
1369                 die("usage: st [-v]\n");
1370         setlocale(LC_CTYPE, "");
1371         tnew(80, 24);
1372         ttynew();
1373         xinit();
1374         run();
1375         return 0;
1376 }