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 #define USAGE \
  32         "st-" VERSION ", (c) 2010 st engineers\n" \
  33         "usage: st [-t title] [-e cmd] [-v]\n"
  34
  35 /* Arbitrary sizes */
  36 #define ESC_TITLE_SIZ 256
  37 #define ESC_BUF_SIZ   256
  38 #define ESC_ARG_SIZ   16
  39 #define DRAW_BUF_SIZ  1024
  40
  41 #define SERRNO strerror(errno)
  42 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  43 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  44 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  45 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  46 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  47 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  48 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  49 #define IS_SET(flag) (term.mode & (flag))
  50
  51 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  52 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  53 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
  54        CURSOR_SAVE, CURSOR_LOAD };
  55 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  56 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  57 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8 };
  58 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  59 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  60
  61 typedef struct {
  62         char c;     /* character code  */
  63         char mode;  /* attribute flags */
  64         int fg;     /* foreground      */
  65         int bg;     /* background      */
  66         char state; /* state flags     */
  67 } Glyph;
  68
  69 typedef Glyph* Line;
  70
  71 typedef struct {
  72         Glyph attr;      /* current char attributes */
  73         int x;
  74         int y;
  75         char state;
  76 } TCursor;
  77
  78 /* CSI Escape sequence structs */
  79 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  80 typedef struct {
  81         char buf[ESC_BUF_SIZ]; /* raw string */
  82         int len;                           /* raw string length */
  83         char priv;
  84         int arg[ESC_ARG_SIZ];
  85         int narg;                          /* nb of args */
  86         char mode;
  87 } CSIEscape;
  88
  89 /* Internal representation of the screen */
  90 typedef struct {
  91         int row;        /* nb row */
  92         int col;        /* nb col */
  93         Line* line;     /* screen */
  94         Line* alt;      /* alternate screen */
  95         TCursor c;      /* cursor */
  96         int top;        /* top    scroll limit */
  97         int bot;        /* bottom scroll limit */
  98         int mode;       /* terminal mode flags */
  99         int esc;        /* escape state flags */
 100         char title[ESC_TITLE_SIZ];
 101         int titlelen;
 102 } Term;
 103
 104 /* Purely graphic info */
 105 typedef struct {
 106         Display* dis;
 107         Window win;
 108         Pixmap buf;
 109         int scr;
 110         int w;  /* window width  */
 111         int h;  /* window height */
 112         int bufw; /* pixmap width  */
 113         int bufh; /* pixmap height */
 114         int ch; /* char height */
 115         int cw; /* char width  */
 116         int hasfocus;
 117 } XWindow;
 118
 119 typedef struct {
 120         KeySym k;
 121         char s[ESC_BUF_SIZ];
 122 } Key;
 123
 124 /* Drawing Context */
 125 typedef struct {
 126         unsigned long col[256];
 127         XFontStruct* font;
 128         XFontStruct* bfont;
 129         GC gc;
 130 } DC;
 131
 132 /* TODO: use better name for vars... */
 133 typedef struct {
 134         int mode;
 135         int bx, by;
 136         int ex, ey;
 137         struct {int x, y;}  b, e;
 138         char *clip;
 139 } Selection;
 140
 141 #include "config.h"
 142
 143 static void die(const char *errstr, ...);
 144 static void draw(int);
 145 static void execsh(void);
 146 static void sigchld(int);
 147 static void run(void);
 148
 149 static void csidump(void);
 150 static void csihandle(void);
 151 static void csiparse(void);
 152 static void csireset(void);
 153
 154 static void tclearregion(int, int, int, int);
 155 static void tcursor(int);
 156 static void tdeletechar(int);
 157 static void tdeleteline(int);
 158 static void tinsertblank(int);
 159 static void tinsertblankline(int);
 160 static void tmoveto(int, int);
 161 static void tnew(int, int);
 162 static void tnewline(void);
 163 static void tputtab(void);
 164 static void tputc(char);
 165 static void tputs(char*, int);
 166 static void treset(void);
 167 static void tresize(int, int);
 168 static void tscrollup(int, int);
 169 static void tscrolldown(int, int);
 170 static void tsetattr(int*, int);
 171 static void tsetchar(char);
 172 static void tsetscroll(int, int);
 173 static void tswapscreen(void);
 174
 175 static void ttynew(void);
 176 static void ttyread(void);
 177 static void ttyresize(int, int);
 178 static void ttywrite(const char *, size_t);
 179
 180 static void xdraws(char *, Glyph, int, int, int);
 181 static void xhints(void);
 182 static void xclear(int, int, int, int);
 183 static void xdrawcursor(void);
 184 static void xinit(void);
 185 static void xloadcols(void);
 186 static void xseturgency(int);
 187
 188 static void expose(XEvent *);
 189 static char* kmap(KeySym);
 190 static void kpress(XEvent *);
 191 static void resize(XEvent *);
 192 static void focus(XEvent *);
 193 static void brelease(XEvent *);
 194 static void bpress(XEvent *);
 195 static void bmotion(XEvent *);
 196
 197
 198 static void (*handler[LASTEvent])(XEvent *) = {
 199         [KeyPress] = kpress,
 200         [Expose] = expose,
 201         [ConfigureNotify] = resize,
 202         [FocusIn] = focus,
 203         [FocusOut] = focus,
 204         [MotionNotify] = bmotion,
 205         [ButtonPress] = bpress,
 206         [ButtonRelease] = brelease,
 207 };
 208
 209 /* Globals */
 210 static DC dc;
 211 static XWindow xw;
 212 static Term term;
 213 static CSIEscape escseq;
 214 static int cmdfd;
 215 static pid_t pid;
 216 static Selection sel;
 217 static char *opt_cmd   = NULL;
 218 static char *opt_title = NULL;
 219
 220 void
 221 selinit(void) {
 222         sel.mode = 0;
 223         sel.bx = -1;
 224         sel.clip = NULL;
 225 }
 226
 227 static inline int selected(int x, int y) {
 228         if(sel.ey == y && sel.by == y) {
 229                 int bx = MIN(sel.bx, sel.ex);
 230                 int ex = MAX(sel.bx, sel.ex);
 231                 return BETWEEN(x, bx, ex);
 232         }
 233         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 234                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 235 }
 236
 237 static void getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 238         if(b) *b = e->xbutton.state,
 239                 *b=*b==4096?5:*b==2048?4:*b==1024?3:*b==512?2:*b==256?1:-1;
 240         *x = e->xbutton.x/xw.cw;
 241         *y = e->xbutton.y/xw.ch;
 242         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 243         sel.b.y = MIN(sel.by, sel.ey);
 244         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 245         sel.e.y = MAX(sel.by, sel.ey);
 246 }
 247
 248 static void bpress(XEvent *e) {
 249         sel.mode = 1;
 250         sel.ex = sel.bx = e->xbutton.x/xw.cw;
 251         sel.ey = sel.by = e->xbutton.y/xw.ch;
 252 }
 253
 254 static char *getseltext() {
 255         char *str, *ptr;
 256         int ls, x, y, sz;
 257         if(sel.bx == -1)
 258                 return NULL;
 259         sz = (term.col+1) * (sel.e.y-sel.b.y+1);
 260         ptr = str = malloc(sz);
 261         for(y = 0; y < term.row; y++) {
 262                 for(x = 0; x < term.col; x++)
 263                         if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y)))
 264                                 *ptr = term.line[y][x].c, ptr++;
 265                 if(ls)
 266                         *ptr = '\n', ptr++;
 267         }
 268         *ptr = 0;
 269         return str;
 270 }
 271
 272 /* TODO: use X11 clipboard */
 273 static void selcopy(char *str) {
 274         free(sel.clip);
 275         sel.clip = str;
 276 }
 277
 278 static void selpaste() {
 279         if(sel.clip)
 280                 ttywrite(sel.clip, strlen(sel.clip));
 281 }
 282
 283 /* TODO: doubleclick to select word */
 284 static void brelease(XEvent *e) {
 285         int b;
 286         sel.mode = 0;
 287         getbuttoninfo(e, &b, &sel.ex, &sel.ey);
 288         if(sel.bx==sel.ex && sel.by==sel.ey) {
 289                 sel.bx = -1;
 290                 if(b==2)
 291                         selpaste();
 292         } else {
 293                 if(b==1)
 294                         selcopy(getseltext());
 295         }
 296         draw(1);
 297 }
 298
 299 static void bmotion(XEvent *e) {
 300         if (sel.mode) {
 301                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 302                 draw(1);
 303         }
 304 }
 305
 306 #ifdef DEBUG
 307 void
 308 tdump(void) {
 309         int row, col;
 310         Glyph c;
 311
 312         for(row = 0; row < term.row; row++) {
 313                 for(col = 0; col < term.col; col++) {
 314                         if(col == term.c.x && row == term.c.y)
 315                                 putchar('#');
 316                         else {
 317                                 c = term.line[row][col];
 318                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 319                         }
 320                 }
 321                 putchar('\n');
 322         }
 323 }
 324 #endif
 325
 326 void
 327 die(const char *errstr, ...) {
 328         va_list ap;
 329
 330         va_start(ap, errstr);
 331         vfprintf(stderr, errstr, ap);
 332         va_end(ap);
 333         exit(EXIT_FAILURE);
 334 }
 335
 336 void
 337 execsh(void) {
 338         char *args[] = {getenv("SHELL"), "-i", NULL};
 339         if(opt_cmd)
 340                 args[0] = opt_cmd, args[1] = NULL;
 341         else
 342                 DEFAULT(args[0], SHELL);
 343         putenv("TERM="TNAME);
 344         execvp(args[0], args);
 345 }
 346
 347 void
 348 sigchld(int a) {
 349         int stat = 0;
 350         if(waitpid(pid, &stat, 0) < 0)
 351                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 352         if(WIFEXITED(stat))
 353                 exit(WEXITSTATUS(stat));
 354         else
 355                 exit(EXIT_FAILURE);
 356 }
 357
 358 void
 359 ttynew(void) {
 360         int m, s;
 361
 362         /* seems to work fine on linux, openbsd and freebsd */
 363         struct winsize w = {term.row, term.col, 0, 0};
 364         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 365                 die("openpty failed: %s\n", SERRNO);
 366
 367         switch(pid = fork()) {
 368         case -1:
 369                 die("fork failed\n");
 370                 break;
 371         case 0:
 372                 setsid(); /* create a new process group */
 373                 dup2(s, STDIN_FILENO);
 374                 dup2(s, STDOUT_FILENO);
 375                 dup2(s, STDERR_FILENO);
 376                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 377                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 378                 close(s);
 379                 close(m);
 380                 execsh();
 381                 break;
 382         default:
 383                 close(s);
 384                 cmdfd = m;
 385                 signal(SIGCHLD, sigchld);
 386         }
 387 }
 388
 389 void
 390 dump(char c) {
 391         static int col;
 392         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 393         if(++col % 10 == 0)
 394                 fprintf(stderr, "\n");
 395 }
 396
 397 void
 398 ttyread(void) {
 399         char buf[BUFSIZ];
 400         int ret;
 401
 402         if((ret = read(cmdfd, buf, LEN(buf))) < 0)
 403                 die("Couldn't read from shell: %s\n", SERRNO);
 404         else
 405                 tputs(buf, ret);
 406 }
 407
 408 void
 409 ttywrite(const char *s, size_t n) {
 410         if(write(cmdfd, s, n) == -1)
 411                 die("write error on tty: %s\n", SERRNO);
 412 }
 413
 414 void
 415 ttyresize(int x, int y) {
 416         struct winsize w;
 417
 418         w.ws_row = term.row;
 419         w.ws_col = term.col;
 420         w.ws_xpixel = w.ws_ypixel = 0;
 421         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 422                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 423 }
 424
 425 void
 426 tcursor(int mode) {
 427         static TCursor c;
 428
 429         if(mode == CURSOR_SAVE)
 430                 c = term.c;
 431         else if(mode == CURSOR_LOAD)
 432                 term.c = c, tmoveto(c.x, c.y);
 433 }
 434
 435 void
 436 treset(void) {
 437         term.c = (TCursor){{
 438                 .mode = ATTR_NULL,
 439                 .fg = DefaultFG,
 440                 .bg = DefaultBG
 441         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 442
 443         term.top = 0, term.bot = term.row - 1;
 444         term.mode = MODE_WRAP;
 445         tclearregion(0, 0, term.col-1, term.row-1);
 446 }
 447
 448 void
 449 tnew(int col, int row) {
 450         /* set screen size */
 451         term.row = row, term.col = col;
 452         term.line = malloc(term.row * sizeof(Line));
 453         term.alt  = malloc(term.row * sizeof(Line));
 454         for(row = 0 ; row < term.row; row++) {
 455                 term.line[row] = malloc(term.col * sizeof(Glyph));
 456                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 457         }
 458         /* setup screen */
 459         treset();
 460 }
 461
 462 void
 463 tswapscreen(void) {
 464         Line* tmp = term.line;
 465         term.line = term.alt;
 466         term.alt = tmp;
 467         term.mode ^= MODE_ALTSCREEN;
 468 }
 469
 470 void
 471 tscrolldown(int orig, int n) {
 472         int i;
 473         Line temp;
 474
 475         LIMIT(n, 0, term.bot-orig+1);
 476
 477         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 478
 479         for(i = term.bot; i >= orig+n; i--) {
 480                 temp = term.line[i];
 481                 term.line[i] = term.line[i-n];
 482                 term.line[i-n] = temp;
 483         }
 484 }
 485
 486 void
 487 tscrollup(int orig, int n) {
 488         int i;
 489         Line temp;
 490         LIMIT(n, 0, term.bot-orig+1);
 491
 492         tclearregion(0, orig, term.col-1, orig+n-1);
 493
 494         for(i = orig; i <= term.bot-n; i++) {
 495                  temp = term.line[i];
 496                  term.line[i] = term.line[i+n];
 497                  term.line[i+n] = temp;
 498         }
 499 }
 500
 501 void
 502 tnewline(void) {
 503         int y = term.c.y;
 504         if(term.c.y == term.bot)
 505                 tscrollup(term.top, 1);
 506         else
 507                 y++;
 508         tmoveto(0, y);
 509 }
 510
 511 void
 512 csiparse(void) {
 513         /* int noarg = 1; */
 514         char *p = escseq.buf;
 515
 516         escseq.narg = 0;
 517         if(*p == '?')
 518                 escseq.priv = 1, p++;
 519
 520         while(p < escseq.buf+escseq.len) {
 521                 while(isdigit(*p)) {
 522                         escseq.arg[escseq.narg] *= 10;
 523                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 524                 }
 525                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 526                         escseq.narg++, p++;
 527                 else {
 528                         escseq.mode = *p;
 529                         escseq.narg++;
 530                         return;
 531                 }
 532         }
 533 }
 534
 535 void
 536 tmoveto(int x, int y) {
 537         LIMIT(x, 0, term.col-1);
 538         LIMIT(y, 0, term.row-1);
 539         term.c.state &= ~CURSOR_WRAPNEXT;
 540         term.c.x = x;
 541         term.c.y = y;
 542 }
 543
 544 void
 545 tsetchar(char c) {
 546         term.line[term.c.y][term.c.x] = term.c.attr;
 547         term.line[term.c.y][term.c.x].c = c;
 548         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 549 }
 550
 551 void
 552 tclearregion(int x1, int y1, int x2, int y2) {
 553         int y, temp;
 554
 555         if(x1 > x2)
 556                 temp = x1, x1 = x2, x2 = temp;
 557         if(y1 > y2)
 558                 temp = y1, y1 = y2, y2 = temp;
 559
 560         LIMIT(x1, 0, term.col-1);
 561         LIMIT(x2, 0, term.col-1);
 562         LIMIT(y1, 0, term.row-1);
 563         LIMIT(y2, 0, term.row-1);
 564
 565         for(y = y1; y <= y2; y++)
 566                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 567 }
 568
 569 void
 570 tdeletechar(int n) {
 571         int src = term.c.x + n;
 572         int dst = term.c.x;
 573         int size = term.col - src;
 574
 575         if(src >= term.col) {
 576                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 577                 return;
 578         }
 579         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 580         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 581 }
 582
 583 void
 584 tinsertblank(int n) {
 585         int src = term.c.x;
 586         int dst = src + n;
 587         int size = term.col - dst;
 588
 589         if(dst >= term.col) {
 590                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 591                 return;
 592         }
 593         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 594         tclearregion(src, term.c.y, dst - 1, term.c.y);
 595 }
 596
 597 void
 598 tinsertblankline(int n) {
 599         if(term.c.y < term.top || term.c.y > term.bot)
 600                 return;
 601
 602         tscrolldown(term.c.y, n);
 603 }
 604
 605 void
 606 tdeleteline(int n) {
 607         if(term.c.y < term.top || term.c.y > term.bot)
 608                 return;
 609
 610         tscrollup(term.c.y, n);
 611 }
 612
 613 void
 614 tsetattr(int *attr, int l) {
 615         int i;
 616
 617         for(i = 0; i < l; i++) {
 618                 switch(attr[i]) {
 619                 case 0:
 620                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 621                         term.c.attr.fg = DefaultFG;
 622                         term.c.attr.bg = DefaultBG;
 623                         break;
 624                 case 1:
 625                         term.c.attr.mode |= ATTR_BOLD;
 626                         break;
 627                 case 4:
 628                         term.c.attr.mode |= ATTR_UNDERLINE;
 629                         break;
 630                 case 7:
 631                         term.c.attr.mode |= ATTR_REVERSE;
 632                         break;
 633                 case 22:
 634                         term.c.attr.mode &= ~ATTR_BOLD;
 635                         break;
 636                 case 24:
 637                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 638                         break;
 639                 case 27:
 640                         term.c.attr.mode &= ~ATTR_REVERSE;
 641                         break;
 642                 case 38:
 643                         if (i + 2 < l && attr[i + 1] == 5) {
 644                                 i += 2;
 645                                 if (BETWEEN(attr[i], 0, 255))
 646                                         term.c.attr.fg = attr[i];
 647                                 else
 648                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 649                         }
 650                         else
 651                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 652                         break;
 653                 case 39:
 654                         term.c.attr.fg = DefaultFG;
 655                         break;
 656                 case 48:
 657                         if (i + 2 < l && attr[i + 1] == 5) {
 658                                 i += 2;
 659                                 if (BETWEEN(attr[i], 0, 255))
 660                                         term.c.attr.bg = attr[i];
 661                                 else
 662                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 663                         }
 664                         else
 665                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 666                         break;
 667                 case 49:
 668                         term.c.attr.bg = DefaultBG;
 669                         break;
 670                 default:
 671                         if(BETWEEN(attr[i], 30, 37))
 672                                 term.c.attr.fg = attr[i] - 30;
 673                         else if(BETWEEN(attr[i], 40, 47))
 674                                 term.c.attr.bg = attr[i] - 40;
 675                         else if(BETWEEN(attr[i], 90, 97))
 676                                 term.c.attr.fg = attr[i] - 90 + 8;
 677                         else if(BETWEEN(attr[i], 100, 107))
 678                                 term.c.attr.fg = attr[i] - 100 + 8;
 679                         else
 680                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
 681
 682                         break;
 683                 }
 684         }
 685 }
 686
 687 void
 688 tsetscroll(int t, int b) {
 689         int temp;
 690
 691         LIMIT(t, 0, term.row-1);
 692         LIMIT(b, 0, term.row-1);
 693         if(t > b) {
 694                 temp = t;
 695                 t = b;
 696                 b = temp;
 697         }
 698         term.top = t;
 699         term.bot = b;
 700 }
 701
 702 void
 703 csihandle(void) {
 704         switch(escseq.mode) {
 705         default:
 706         unknown:
 707                 printf("erresc: unknown csi ");
 708                 csidump();
 709                 /* die(""); */
 710                 break;
 711         case '@': /* ICH -- Insert <n> blank char */
 712                 DEFAULT(escseq.arg[0], 1);
 713                 tinsertblank(escseq.arg[0]);
 714                 break;
 715         case 'A': /* CUU -- Cursor <n> Up */
 716         case 'e':
 717                 DEFAULT(escseq.arg[0], 1);
 718                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 719                 break;
 720         case 'B': /* CUD -- Cursor <n> Down */
 721                 DEFAULT(escseq.arg[0], 1);
 722                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 723                 break;
 724         case 'C': /* CUF -- Cursor <n> Forward */
 725         case 'a':
 726                 DEFAULT(escseq.arg[0], 1);
 727                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 728                 break;
 729         case 'D': /* CUB -- Cursor <n> Backward */
 730                 DEFAULT(escseq.arg[0], 1);
 731                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 732                 break;
 733         case 'E': /* CNL -- Cursor <n> Down and first col */
 734                 DEFAULT(escseq.arg[0], 1);
 735                 tmoveto(0, term.c.y+escseq.arg[0]);
 736                 break;
 737         case 'F': /* CPL -- Cursor <n> Up and first col */
 738                 DEFAULT(escseq.arg[0], 1);
 739                 tmoveto(0, term.c.y-escseq.arg[0]);
 740                 break;
 741         case 'G': /* CHA -- Move to <col> */
 742         case '`': /* XXX: HPA -- same? */
 743                 DEFAULT(escseq.arg[0], 1);
 744                 tmoveto(escseq.arg[0]-1, term.c.y);
 745                 break;
 746         case 'H': /* CUP -- Move to <row> <col> */
 747         case 'f': /* XXX: HVP -- same? */
 748                 DEFAULT(escseq.arg[0], 1);
 749                 DEFAULT(escseq.arg[1], 1);
 750                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 751                 break;
 752         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 753         case 'J': /* ED -- Clear screen */
 754                 switch(escseq.arg[0]) {
 755                 case 0: /* below */
 756                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 757                         break;
 758                 case 1: /* above */
 759                         tclearregion(0, 0, term.c.x, term.c.y);
 760                         break;
 761                 case 2: /* all */
 762                         tclearregion(0, 0, term.col-1, term.row-1);
 763                         break;
 764                 default:
 765                         goto unknown;
 766                 }
 767                 break;
 768         case 'K': /* EL -- Clear line */
 769                 switch(escseq.arg[0]) {
 770                 case 0: /* right */
 771                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 772                         break;
 773                 case 1: /* left */
 774                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 775                         break;
 776                 case 2: /* all */
 777                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 778                         break;
 779                 }
 780                 break;
 781         case 'S': /* SU -- Scroll <n> line up */
 782                 DEFAULT(escseq.arg[0], 1);
 783                 tscrollup(term.top, escseq.arg[0]);
 784                 break;
 785         case 'T': /* SD -- Scroll <n> line down */
 786                 DEFAULT(escseq.arg[0], 1);
 787                 tscrolldown(term.top, escseq.arg[0]);
 788                 break;
 789         case 'L': /* IL -- Insert <n> blank lines */
 790                 DEFAULT(escseq.arg[0], 1);
 791                 tinsertblankline(escseq.arg[0]);
 792                 break;
 793         case 'l': /* RM -- Reset Mode */
 794                 if(escseq.priv) {
 795                         switch(escseq.arg[0]) {
 796                         case 1:
 797                                 term.mode &= ~MODE_APPKEYPAD;
 798                                 break;
 799                         case 7:
 800                                 term.mode &= ~MODE_WRAP;
 801                                 break;
 802                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 803                                 break;
 804                         case 25:
 805                                 term.c.state |= CURSOR_HIDE;
 806                                 break;
 807                         case 1049: /* = 1047 and 1048 */
 808                         case 1047:
 809                                 if(IS_SET(MODE_ALTSCREEN)) {
 810                                         tclearregion(0, 0, term.col-1, term.row-1);
 811                                         tswapscreen();
 812                                 }
 813                                 if(escseq.arg[0] == 1047)
 814                                         break;
 815                         case 1048:
 816                                 tcursor(CURSOR_LOAD);
 817                                 break;
 818                         default:
 819                                 goto unknown;
 820                         }
 821                 } else {
 822                         switch(escseq.arg[0]) {
 823                         case 4:
 824                                 term.mode &= ~MODE_INSERT;
 825                                 break;
 826                         default:
 827                                 goto unknown;
 828                         }
 829                 }
 830                 break;
 831         case 'M': /* DL -- Delete <n> lines */
 832                 DEFAULT(escseq.arg[0], 1);
 833                 tdeleteline(escseq.arg[0]);
 834                 break;
 835         case 'X': /* ECH -- Erase <n> char */
 836                 DEFAULT(escseq.arg[0], 1);
 837                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 838                 break;
 839         case 'P': /* DCH -- Delete <n> char */
 840                 DEFAULT(escseq.arg[0], 1);
 841                 tdeletechar(escseq.arg[0]);
 842                 break;
 843         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 844         case 'd': /* VPA -- Move to <row> */
 845                 DEFAULT(escseq.arg[0], 1);
 846                 tmoveto(term.c.x, escseq.arg[0]-1);
 847                 break;
 848         case 'h': /* SM -- Set terminal mode */
 849                 if(escseq.priv) {
 850                         switch(escseq.arg[0]) {
 851                         case 1:
 852                                 term.mode |= MODE_APPKEYPAD;
 853                                 break;
 854                         case 7:
 855                                 term.mode |= MODE_WRAP;
 856                                 break;
 857                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 858                                  /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
 859                                 if(escseq.narg > 1 && escseq.arg[1] != 25)
 860                                         break;
 861                         case 25:
 862                                 term.c.state &= ~CURSOR_HIDE;
 863                                 break;
 864                         case 1049: /* = 1047 and 1048 */
 865                         case 1047:
 866                                 if(IS_SET(MODE_ALTSCREEN))
 867                                         tclearregion(0, 0, term.col-1, term.row-1);
 868                                 else
 869                                         tswapscreen();
 870                                 if(escseq.arg[0] == 1047)
 871                                         break;
 872                         case 1048:
 873                                 tcursor(CURSOR_SAVE);
 874                                 break;
 875                         default: goto unknown;
 876                         }
 877                 } else {
 878                         switch(escseq.arg[0]) {
 879                         case 4:
 880                                 term.mode |= MODE_INSERT;
 881                                 break;
 882                         default: goto unknown;
 883                         }
 884                 };
 885                 break;
 886         case 'm': /* SGR -- Terminal attribute (color) */
 887                 tsetattr(escseq.arg, escseq.narg);
 888                 break;
 889         case 'r': /* DECSTBM -- Set Scrolling Region */
 890                 if(escseq.priv)
 891                         goto unknown;
 892                 else {
 893                         DEFAULT(escseq.arg[0], 1);
 894                         DEFAULT(escseq.arg[1], term.row);
 895                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 896                         tmoveto(0, 0);
 897                 }
 898                 break;
 899         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 900                 tcursor(CURSOR_SAVE);
 901                 break;
 902         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 903                 tcursor(CURSOR_LOAD);
 904                 break;
 905         }
 906 }
 907
 908 void
 909 csidump(void) {
 910         int i;
 911         printf("ESC [ %s", escseq.priv ? "? " : "");
 912         if(escseq.narg)
 913                 for(i = 0; i < escseq.narg; i++)
 914                         printf("%d ", escseq.arg[i]);
 915         if(escseq.mode)
 916                 putchar(escseq.mode);
 917         putchar('\n');
 918 }
 919
 920 void
 921 csireset(void) {
 922         memset(&escseq, 0, sizeof(escseq));
 923 }
 924
 925 void
 926 tputtab(void) {
 927         int space = TAB - term.c.x % TAB;
 928         tmoveto(term.c.x + space, term.c.y);
 929 }
 930
 931 void
 932 tputc(char c) {
 933         if(term.esc & ESC_START) {
 934                 if(term.esc & ESC_CSI) {
 935                         escseq.buf[escseq.len++] = c;
 936                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 937                                 term.esc = 0;
 938                                 csiparse(), csihandle();
 939                         }
 940                         /* TODO: handle other OSC */
 941                 } else if(term.esc & ESC_OSC) {
 942                         if(c == ';') {
 943                                 term.titlelen = 0;
 944                                 term.esc = ESC_START | ESC_TITLE;
 945                         }
 946                 } else if(term.esc & ESC_TITLE) {
 947                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 948                                 term.esc = 0;
 949                                 term.title[term.titlelen] = '\0';
 950                                 XStoreName(xw.dis, xw.win, term.title);
 951                         } else {
 952                                 term.title[term.titlelen++] = c;
 953                         }
 954                 } else if(term.esc & ESC_ALTCHARSET) {
 955                         switch(c) {
 956                         case '0': /* Line drawing crap */
 957                                 term.c.attr.mode |= ATTR_GFX;
 958                                 break;
 959                         case 'B': /* Back to regular text */
 960                                 term.c.attr.mode &= ~ATTR_GFX;
 961                                 break;
 962                         default:
 963                                 printf("esc unhandled charset: ESC ( %c\n", c);
 964                         }
 965                         term.esc = 0;
 966                 } else {
 967                         switch(c) {
 968                         case '[':
 969                                 term.esc |= ESC_CSI;
 970                                 break;
 971                         case ']':
 972                                 term.esc |= ESC_OSC;
 973                                 break;
 974                         case '(':
 975                                 term.esc |= ESC_ALTCHARSET;
 976                                 break;
 977                         case 'D': /* IND -- Linefeed */
 978                                 if(term.c.y == term.bot)
 979                                         tscrollup(term.top, 1);
 980                                 else
 981                                         tmoveto(term.c.x, term.c.y+1);
 982                                 term.esc = 0;
 983                                 break;
 984                         case 'E': /* NEL -- Next line */
 985                                 tnewline();
 986                                 term.esc = 0;
 987                                 break;
 988                         case 'M': /* RI -- Reverse index */
 989                                 if(term.c.y == term.top)
 990                                         tscrolldown(term.top, 1);
 991                                 else
 992                                         tmoveto(term.c.x, term.c.y-1);
 993                                 term.esc = 0;
 994                                 break;
 995                         case 'c': /* RIS -- Reset to inital state */
 996                                 treset();
 997                                 term.esc = 0;
 998                                 break;
 999                         case '=': /* DECPAM -- Application keypad */
1000                                 term.mode |= MODE_APPKEYPAD;
1001                                 term.esc = 0;
1002                                 break;
1003                         case '>': /* DECPNM -- Normal keypad */
1004                                 term.mode &= ~MODE_APPKEYPAD;
1005                                 term.esc = 0;
1006                                 break;
1007                         case '7': /* DECSC -- Save Cursor */
1008                                 tcursor(CURSOR_SAVE);
1009                                 term.esc = 0;
1010                                 break;
1011                         case '8': /* DECRC -- Restore Cursor */
1012                                 tcursor(CURSOR_LOAD);
1013                                 term.esc = 0;
1014                                 break;
1015                         default:
1016                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
1017                                 term.esc = 0;
1018                         }
1019                 }
1020         } else {
1021                 switch(c) {
1022                 case '\t':
1023                         tputtab();
1024                         break;
1025                 case '\b':
1026                         tmoveto(term.c.x-1, term.c.y);
1027                         break;
1028                 case '\r':
1029                         tmoveto(0, term.c.y);
1030                         break;
1031                 case '\n':
1032                         tnewline();
1033                         break;
1034                 case '\a':
1035                         if(!xw.hasfocus)
1036                                 xseturgency(1);
1037                         break;
1038                 case '\033':
1039                         csireset();
1040                         term.esc = ESC_START;
1041                         break;
1042                 default:
1043                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1044                                 tnewline();
1045                         tsetchar(c);
1046                         if(term.c.x+1 < term.col)
1047                                 tmoveto(term.c.x+1, term.c.y);
1048                         else
1049                                 term.c.state |= CURSOR_WRAPNEXT;
1050                         break;
1051                 }
1052         }
1053 }
1054
1055 void
1056 tputs(char *s, int len) {
1057         for(; len > 0; len--)
1058                 tputc(*s++);
1059 }
1060
1061 void
1062 tresize(int col, int row) {
1063         int i;
1064         int minrow = MIN(row, term.row);
1065         int mincol = MIN(col, term.col);
1066         int slide = term.c.y - row + 1;
1067
1068         if(col < 1 || row < 1)
1069                 return;
1070
1071         /* free unneeded rows */
1072         i = 0;
1073         if(slide > 0) {
1074                 /* slide screen to keep cursor where we expect it -
1075                  * tscrollup would work here, but we can optimize to
1076                  * memmove because we're freeing the earlier lines */
1077                 for(/* i = 0 */; i < slide; i++) {
1078                         free(term.line[i]);
1079                         free(term.alt[i]);
1080                 }
1081                 memmove(term.line, term.line + slide, row * sizeof(Line));
1082                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1083         }
1084         for(i += row; i < term.row; i++) {
1085                 free(term.line[i]);
1086                 free(term.alt[i]);
1087         }
1088
1089         /* resize to new height */
1090         term.line = realloc(term.line, row * sizeof(Line));
1091         term.alt  = realloc(term.alt,  row * sizeof(Line));
1092
1093         /* resize each row to new width, zero-pad if needed */
1094         for(i = 0; i < minrow; i++) {
1095                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1096                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1097                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1098                 memset(term.alt[i]  + mincol, 0, (col - mincol) * sizeof(Glyph));
1099         }
1100
1101         /* allocate any new rows */
1102         for(/* i == minrow */; i < row; i++) {
1103                 term.line[i] = calloc(col, sizeof(Glyph));
1104                 term.alt [i] = calloc(col, sizeof(Glyph));
1105         }
1106
1107         /* update terminal size */
1108         term.col = col, term.row = row;
1109         /* make use of the LIMIT in tmoveto */
1110         tmoveto(term.c.x, term.c.y);
1111         /* reset scrolling region */
1112         tsetscroll(0, row-1);
1113 }
1114
1115 void
1116 xloadcols(void) {
1117         int i, r, g, b;
1118         XColor color;
1119         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1120         unsigned long white = WhitePixel(xw.dis, xw.scr);
1121
1122         for(i = 0; i < 16; i++) {
1123                 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1124                         dc.col[i] = white;
1125                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1126                 } else
1127                         dc.col[i] = color.pixel;
1128         }
1129
1130         /* same colors as xterm */
1131         for(r = 0; r < 6; r++)
1132                 for(g = 0; g < 6; g++)
1133                         for(b = 0; b < 6; b++) {
1134                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1135                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1136                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1137                                 if (!XAllocColor(xw.dis, cmap, &color)) {
1138                                         dc.col[i] = white;
1139                                         fprintf(stderr, "Could not allocate color %d\n", i);
1140                                 } else
1141                                         dc.col[i] = color.pixel;
1142                                 i++;
1143                         }
1144
1145         for(r = 0; r < 24; r++, i++) {
1146                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1147                 if (!XAllocColor(xw.dis, cmap, &color)) {
1148                         dc.col[i] = white;
1149                         fprintf(stderr, "Could not allocate color %d\n", i);
1150                 } else
1151                         dc.col[i] = color.pixel;
1152         }
1153 }
1154
1155 void
1156 xclear(int x1, int y1, int x2, int y2) {
1157         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1158         XFillRectangle(xw.dis, xw.buf, dc.gc,
1159                        x1 * xw.cw, y1 * xw.ch,
1160                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1161 }
1162
1163 void
1164 xhints(void)
1165 {
1166         XClassHint class = {TNAME, TNAME};
1167         XWMHints wm = {.flags = InputHint, .input = 1};
1168         XSizeHints size = {
1169                 .flags = PSize | PResizeInc | PBaseSize,
1170                 .height = xw.h,
1171                 .width = xw.w,
1172                 .height_inc = xw.ch,
1173                 .width_inc = xw.cw,
1174                 .base_height = 2*BORDER,
1175                 .base_width = 2*BORDER,
1176         };
1177         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1178 }
1179
1180 void
1181 xinit(void) {
1182         if(!(xw.dis = XOpenDisplay(NULL)))
1183                 die("Can't open display\n");
1184         xw.scr = XDefaultScreen(xw.dis);
1185
1186         /* font */
1187         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1188                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1189
1190         /* XXX: Assuming same size for bold font */
1191         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1192         xw.ch = dc.font->ascent + dc.font->descent;
1193
1194         /* colors */
1195         xloadcols();
1196
1197         /* windows */
1198         xw.bufh = term.row * xw.ch;
1199         xw.bufw = term.col * xw.cw;
1200         xw.h = xw.bufh + 2*BORDER;
1201         xw.w = xw.bufw + 2*BORDER;
1202         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1203                         xw.w, xw.h, 0,
1204                         dc.col[DefaultBG],
1205                         dc.col[DefaultBG]);
1206         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1207         /* gc */
1208         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1209
1210         /* event mask */
1211         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask
1212                 | StructureNotifyMask | FocusChangeMask | PointerMotionMask
1213                 | ButtonPressMask | ButtonReleaseMask);
1214
1215         XMapWindow(xw.dis, xw.win);
1216         xhints();
1217         XStoreName(xw.dis, xw.win, opt_title ? opt_title : "st");
1218         XSync(xw.dis, 0);
1219 }
1220
1221 void
1222 xdraws(char *s, Glyph base, int x, int y, int len) {
1223         unsigned long xfg, xbg;
1224         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1225         int i;
1226
1227         if(base.mode & ATTR_REVERSE)
1228                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1229         else
1230                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1231
1232         XSetBackground(xw.dis, dc.gc, xbg);
1233         XSetForeground(xw.dis, dc.gc, xfg);
1234
1235         if(base.mode & ATTR_GFX)
1236                 for(i = 0; i < len; i++) {
1237                         char c = gfx[(unsigned int)s[i] % 256];
1238                         if(c)
1239                                 s[i] = c;
1240                         else if(s[i] > 0x5f)
1241                                 s[i] -= 0x5f;
1242                 }
1243
1244         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1245         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1246
1247         if(base.mode & ATTR_UNDERLINE)
1248                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1249 }
1250
1251 void
1252 xdrawcursor(void) {
1253         static int oldx = 0;
1254         static int oldy = 0;
1255         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1256
1257         LIMIT(oldx, 0, term.col-1);
1258         LIMIT(oldy, 0, term.row-1);
1259
1260         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1261                 g.c = term.line[term.c.y][term.c.x].c;
1262
1263         /* remove the old cursor */
1264         if(term.line[oldy][oldx].state & GLYPH_SET)
1265                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1266         else
1267                 xclear(oldx, oldy, oldx, oldy);
1268
1269         /* draw the new one */
1270         if(!(term.c.state & CURSOR_HIDE) && xw.hasfocus) {
1271                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1272                 oldx = term.c.x, oldy = term.c.y;
1273         }
1274 }
1275
1276 #ifdef DEBUG
1277 /* basic drawing routines */
1278 void
1279 xdrawc(int x, int y, Glyph g) {
1280         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1281         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1282         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1283         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1284         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1285 }
1286
1287 void
1288 draw(int dummy) {
1289         int x, y;
1290
1291         xclear(0, 0, term.col-1, term.row-1);
1292         for(y = 0; y < term.row; y++)
1293                 for(x = 0; x < term.col; x++)
1294                         if(term.line[y][x].state & GLYPH_SET)
1295                                 xdrawc(x, y, term.line[y][x]);
1296
1297         xdrawcursor();
1298         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1299         XFlush(xw.dis);
1300 }
1301
1302 #else
1303 /* optimized drawing routine */
1304 void
1305 draw(int redraw_all) {
1306         int i, x, y, ox;
1307         Glyph base, new;
1308         char buf[DRAW_BUF_SIZ];
1309
1310         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1311         XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.bufw, xw.bufh);
1312         for(y = 0; y < term.row; y++) {
1313                 base = term.line[y][0];
1314                 i = ox = 0;
1315                 for(x = 0; x < term.col; x++) {
1316                         new = term.line[y][x];
1317                         if(sel.bx!=-1 && new.c && selected(x, y))
1318                                 new.mode ^= ATTR_REVERSE;
1319                         if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1320                                         i >= DRAW_BUF_SIZ)) {
1321                                 xdraws(buf, base, ox, y, i);
1322                                 i = 0;
1323                         }
1324                         if(new.state & GLYPH_SET) {
1325                                 if(i == 0) {
1326                                         ox = x;
1327                                         base = new;
1328                                 }
1329                                 buf[i++] = new.c;
1330                         }
1331                 }
1332                 if(i > 0)
1333                         xdraws(buf, base, ox, y, i);
1334         }
1335         xdrawcursor();
1336         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1337         XFlush(xw.dis);
1338 }
1339
1340 #endif
1341
1342 void
1343 expose(XEvent *ev) {
1344         draw(SCREEN_REDRAW);
1345 }
1346
1347 void
1348 xseturgency(int add) {
1349         XWMHints *h = XGetWMHints(xw.dis, xw.win);
1350         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1351         XSetWMHints(xw.dis, xw.win, h);
1352         XFree(h);
1353 }
1354
1355 void
1356 focus(XEvent *ev) {
1357         if((xw.hasfocus = ev->type == FocusIn))
1358                 xseturgency(0);
1359         draw(SCREEN_UPDATE);
1360 }
1361
1362 char*
1363 kmap(KeySym k) {
1364         int i;
1365         for(i = 0; i < LEN(key); i++)
1366                 if(key[i].k == k)
1367                         return (char*)key[i].s;
1368         return NULL;
1369 }
1370
1371 void
1372 kpress(XEvent *ev) {
1373         XKeyEvent *e = &ev->xkey;
1374         KeySym ksym;
1375         char buf[32];
1376         char *customkey;
1377         int len;
1378         int meta;
1379         int shift;
1380
1381         meta = e->state & Mod1Mask;
1382         shift = e->state & ShiftMask;
1383         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1384
1385         if((customkey = kmap(ksym)))
1386                 ttywrite(customkey, strlen(customkey));
1387         else if(len > 0) {
1388                 buf[sizeof(buf)-1] = '\0';
1389                 if(meta && len == 1)
1390                         ttywrite("\033", 1);
1391                 ttywrite(buf, len);
1392         } else
1393                 switch(ksym) {
1394                 case XK_Up:
1395                 case XK_Down:
1396                 case XK_Left:
1397                 case XK_Right:
1398                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1399                         ttywrite(buf, 3);
1400                         break;
1401                 case XK_Insert:
1402                         if(shift)
1403                                 selpaste(), draw(1);
1404                         break;
1405                 default:
1406                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1407                         break;
1408                 }
1409 }
1410
1411 void
1412 resize(XEvent *e) {
1413         int col, row;
1414
1415         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1416                 return;
1417
1418         xw.w = e->xconfigure.width;
1419         xw.h = e->xconfigure.height;
1420         xw.bufw = xw.w - 2*BORDER;
1421         xw.bufh = xw.h - 2*BORDER;
1422         col = xw.bufw / xw.cw;
1423         row = xw.bufh / xw.ch;
1424         tresize(col, row);
1425         ttyresize(col, row);
1426         xw.bufh = MAX(1, xw.bufh);
1427         xw.bufw = MAX(1, xw.bufw);
1428         XFreePixmap(xw.dis, xw.buf);
1429         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1430         draw(SCREEN_REDRAW);
1431 }
1432
1433 void
1434 run(void) {
1435         XEvent ev;
1436         fd_set rfd;
1437         int xfd = XConnectionNumber(xw.dis);
1438
1439         for(;;) {
1440                 FD_ZERO(&rfd);
1441                 FD_SET(cmdfd, &rfd);
1442                 FD_SET(xfd, &rfd);
1443                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1444                         if(errno == EINTR)
1445                                 continue;
1446                         die("select failed: %s\n", SERRNO);
1447                 }
1448                 if(FD_ISSET(cmdfd, &rfd)) {
1449                         ttyread();
1450                         draw(SCREEN_UPDATE);
1451                 }
1452                 while(XPending(xw.dis)) {
1453                         XNextEvent(xw.dis, &ev);
1454                         if(handler[ev.type])
1455                                 (handler[ev.type])(&ev);
1456                 }
1457         }
1458 }
1459
1460 int
1461 main(int argc, char *argv[]) {
1462         int i;
1463
1464         for(i = 1; i < argc; i++) {
1465                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1466                 case 't':
1467                         if(++i < argc) opt_title = argv[i];
1468                         break;
1469                 case 'e':
1470                         if(++i < argc) opt_cmd = argv[i];
1471                         break;
1472                 case 'v':
1473                 default:
1474                         die(USAGE);
1475                 }
1476         }
1477         setlocale(LC_CTYPE, "");
1478         tnew(80, 24);
1479         ttynew();
1480         xinit();
1481         selinit();
1482         run();
1483         return 0;
1484 }