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/Xatom.h>
  21 #include <X11/keysym.h>
  22 #include <X11/Xutil.h>
  23
  24 #if   defined(__linux)
  25  #include <pty.h>
  26 #elif defined(__OpenBSD__) || defined(__NetBSD__)
  27  #include <util.h>
  28 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  29  #include <libutil.h>
  30 #endif
  31
  32 #define USAGE \
  33         "st-" VERSION ", (c) 2010 st engineers\n" \
  34         "usage: st [-t title] [-e cmd] [-v]\n"
  35
  36 /* Arbitrary sizes */
  37 #define ESC_TITLE_SIZ 256
  38 #define ESC_BUF_SIZ   256
  39 #define ESC_ARG_SIZ   16
  40 #define DRAW_BUF_SIZ  1024
  41
  42 #define SERRNO strerror(errno)
  43 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  44 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  45 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  46 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  47 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  48 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  49 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  50 #define IS_SET(flag) (term.mode & (flag))
  51
  52 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  53 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  54 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
  55        CURSOR_SAVE, CURSOR_LOAD };
  56 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  57 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  58 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
  59        MODE_CRLF=16 };
  60 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  61 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  62 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
  63
  64 typedef struct {
  65         char c;     /* character code  */
  66         char mode;  /* attribute flags */
  67         int fg;     /* foreground      */
  68         int bg;     /* background      */
  69         char state; /* state flags     */
  70 } Glyph;
  71
  72 typedef Glyph* Line;
  73
  74 typedef struct {
  75         Glyph attr;      /* current char attributes */
  76         int x;
  77         int y;
  78         char state;
  79 } TCursor;
  80
  81 /* CSI Escape sequence structs */
  82 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  83 typedef struct {
  84         char buf[ESC_BUF_SIZ]; /* raw string */
  85         int len;                           /* raw string length */
  86         char priv;
  87         int arg[ESC_ARG_SIZ];
  88         int narg;                          /* nb of args */
  89         char mode;
  90 } CSIEscape;
  91
  92 /* Internal representation of the screen */
  93 typedef struct {
  94         int row;        /* nb row */
  95         int col;        /* nb col */
  96         Line* line;     /* screen */
  97         Line* alt;      /* alternate screen */
  98         TCursor c;      /* cursor */
  99         int top;        /* top    scroll limit */
 100         int bot;        /* bottom scroll limit */
 101         int mode;       /* terminal mode flags */
 102         int esc;        /* escape state flags */
 103         char title[ESC_TITLE_SIZ];
 104         int titlelen;
 105 } Term;
 106
 107 /* Purely graphic info */
 108 typedef struct {
 109         Display* dis;
 110         Colormap cmap;
 111         Window win;
 112         Pixmap buf;
 113         XIM xim;
 114         XIC xic;
 115         int scr;
 116         int w;  /* window width  */
 117         int h;  /* window height */
 118         int bufw; /* pixmap width  */
 119         int bufh; /* pixmap height */
 120         int ch; /* char height */
 121         int cw; /* char width  */
 122         char state; /* focus, redraw, visible */
 123 } XWindow;
 124
 125 typedef struct {
 126         KeySym k;
 127         char s[ESC_BUF_SIZ];
 128 } Key;
 129
 130 /* Drawing Context */
 131 typedef struct {
 132         unsigned long col[256];
 133         XFontStruct* font;
 134         XFontStruct* bfont;
 135         GC gc;
 136 } DC;
 137
 138 /* TODO: use better name for vars... */
 139 typedef struct {
 140         int mode;
 141         int bx, by;
 142         int ex, ey;
 143         struct {int x, y;}  b, e;
 144         char *clip;
 145 } Selection;
 146
 147 #include "config.h"
 148
 149 static void die(const char *errstr, ...);
 150 static void draw(int);
 151 static void execsh(void);
 152 static void sigchld(int);
 153 static void run(void);
 154
 155 static void csidump(void);
 156 static void csihandle(void);
 157 static void csiparse(void);
 158 static void csireset(void);
 159
 160 static void tclearregion(int, int, int, int);
 161 static void tcursor(int);
 162 static void tdeletechar(int);
 163 static void tdeleteline(int);
 164 static void tinsertblank(int);
 165 static void tinsertblankline(int);
 166 static void tmoveto(int, int);
 167 static void tnew(int, int);
 168 static void tnewline(int);
 169 static void tputtab(void);
 170 static void tputc(char);
 171 static void tputs(char*, int);
 172 static void treset(void);
 173 static void tresize(int, int);
 174 static void tscrollup(int, int);
 175 static void tscrolldown(int, int);
 176 static void tsetattr(int*, int);
 177 static void tsetchar(char);
 178 static void tsetscroll(int, int);
 179 static void tswapscreen(void);
 180
 181 static void ttynew(void);
 182 static void ttyread(void);
 183 static void ttyresize(int, int);
 184 static void ttywrite(const char *, size_t);
 185
 186 static void xdraws(char *, Glyph, int, int, int);
 187 static void xhints(void);
 188 static void xclear(int, int, int, int);
 189 static void xdrawcursor(void);
 190 static void xinit(void);
 191 static void xloadcols(void);
 192 static void xseturgency(int);
 193
 194 static void expose(XEvent *);
 195 static void visibility(XEvent *);
 196 static void unmap(XEvent *);
 197 static char* kmap(KeySym);
 198 static void kpress(XEvent *);
 199 static void resize(XEvent *);
 200 static void focus(XEvent *);
 201 static void brelease(XEvent *);
 202 static void bpress(XEvent *);
 203 static void bmotion(XEvent *);
 204 static void selection_notify(XEvent *);
 205 static void selection_request(XEvent *);
 206
 207 static void (*handler[LASTEvent])(XEvent *) = {
 208         [KeyPress] = kpress,
 209         [ConfigureNotify] = resize,
 210         [VisibilityNotify] = visibility,
 211         [UnmapNotify] = unmap,
 212         [Expose] = expose,
 213         [FocusIn] = focus,
 214         [FocusOut] = focus,
 215         [MotionNotify] = bmotion,
 216         [ButtonPress] = bpress,
 217         [ButtonRelease] = brelease,
 218         [SelectionNotify] = selection_notify,
 219         [SelectionRequest] = selection_request,
 220 };
 221
 222 /* Globals */
 223 static DC dc;
 224 static XWindow xw;
 225 static Term term;
 226 static CSIEscape escseq;
 227 static int cmdfd;
 228 static pid_t pid;
 229 static Selection sel;
 230 static char *opt_cmd   = NULL;
 231 static char *opt_title = NULL;
 232
 233 void
 234 selinit(void) {
 235         sel.mode = 0;
 236         sel.bx = -1;
 237         sel.clip = NULL;
 238 }
 239
 240 static inline int selected(int x, int y) {
 241         if(sel.ey == y && sel.by == y) {
 242                 int bx = MIN(sel.bx, sel.ex);
 243                 int ex = MAX(sel.bx, sel.ex);
 244                 return BETWEEN(x, bx, ex);
 245         }
 246         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 247                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 248 }
 249
 250 static void getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 251         if(b)
 252                 *b = e->xbutton.button;
 253
 254         *x = e->xbutton.x/xw.cw;
 255         *y = e->xbutton.y/xw.ch;
 256         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 257         sel.b.y = MIN(sel.by, sel.ey);
 258         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 259         sel.e.y = MAX(sel.by, sel.ey);
 260 }
 261
 262 static void bpress(XEvent *e) {
 263         sel.mode = 1;
 264         sel.ex = sel.bx = e->xbutton.x/xw.cw;
 265         sel.ey = sel.by = e->xbutton.y/xw.ch;
 266 }
 267
 268 static char *getseltext() {
 269         char *str, *ptr;
 270         int ls, x, y, sz;
 271         if(sel.bx == -1)
 272                 return NULL;
 273         sz = (term.col+1) * (sel.e.y-sel.b.y+1);
 274         ptr = str = malloc(sz);
 275         for(y = 0; y < term.row; y++) {
 276                 for(x = 0; x < term.col; x++)
 277                         if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y)))
 278                                 *ptr = term.line[y][x].c, ptr++;
 279                 if(ls)
 280                         *ptr = '\n', ptr++;
 281         }
 282         *ptr = 0;
 283         return str;
 284 }
 285
 286 static void selection_notify(XEvent *e) {
 287         unsigned long nitems;
 288         unsigned long length;
 289         int format, res;
 290         unsigned char *data;
 291         Atom type;
 292
 293         res = XGetWindowProperty(xw.dis, xw.win, XA_PRIMARY, 0, 0, False,
 294                                 AnyPropertyType, &type, &format, &nitems, &length, &data);
 295         switch(res) {
 296                 case BadAtom:
 297                 case BadValue:
 298                 case BadWindow:
 299                         fprintf(stderr, "Invalid paste, XGetWindowProperty0");
 300                         return;
 301         }
 302
 303         res = XGetWindowProperty(xw.dis, xw.win, XA_PRIMARY, 0, length, False,
 304                                 AnyPropertyType, &type, &format, &nitems, &length, &data);
 305         switch(res) {
 306                 case BadAtom:
 307                 case BadValue:
 308                 case BadWindow:
 309                         fprintf(stderr, "Invalid paste, XGetWindowProperty0");
 310                         return;
 311         }
 312
 313         if(data) {
 314                 ttywrite((const char *) data, nitems * format / 8);
 315                 XFree(data);
 316         }
 317 }
 318
 319 static void selpaste() {
 320         XConvertSelection(xw.dis, XA_PRIMARY, XA_STRING, XA_PRIMARY, xw.win, CurrentTime);
 321 }
 322
 323 static void selection_request(XEvent *e)
 324 {
 325         XSelectionRequestEvent *xsre;
 326         XSelectionEvent xev;
 327         int res;
 328         Atom xa_targets;
 329
 330         xsre = (XSelectionRequestEvent *) e;
 331         xev.type = SelectionNotify;
 332         xev.requestor = xsre->requestor;
 333         xev.selection = xsre->selection;
 334         xev.target = xsre->target;
 335         xev.time = xsre->time;
 336         /* reject */
 337         xev.property = None;
 338
 339         xa_targets = XInternAtom(xw.dis, "TARGETS", 0);
 340         if(xsre->target == xa_targets) {
 341                 /* respond with the supported type */
 342                 Atom string = XA_STRING;
 343                 res = XChangeProperty(xsre->display, xsre->requestor, xsre->property, XA_ATOM, 32,
 344                                 PropModeReplace, (unsigned char *) &string, 1);
 345                 switch(res) {
 346                         case BadAlloc:
 347                         case BadAtom:
 348                         case BadMatch:
 349                         case BadValue:
 350                         case BadWindow:
 351                                 fprintf(stderr, "Error in selection_request, TARGETS");
 352                                 break;
 353                         default:
 354                                 xev.property = xsre->property;
 355                 }
 356         } else if(xsre->target == XA_STRING) {
 357                 res = XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 358                                 xsre->target, 8, PropModeReplace, (unsigned char *) sel.clip,
 359                                 strlen(sel.clip));
 360                 switch(res) {
 361                         case BadAlloc:
 362                         case BadAtom:
 363                         case BadMatch:
 364                         case BadValue:
 365                         case BadWindow:
 366                                 fprintf(stderr, "Error in selection_request, XA_STRING");
 367                                 break;
 368                         default:
 369                          xev.property = xsre->property;
 370                 }
 371         }
 372
 373         /* all done, send a notification to the listener */
 374         res = XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev);
 375         switch(res) {
 376                 case 0:
 377                 case BadValue:
 378                 case BadWindow:
 379                         fprintf(stderr, "Error in selection_requested, XSendEvent");
 380         }
 381 }
 382
 383 static void selcopy(char *str) {
 384         /* register the selection for both the clipboard and the primary */
 385         Atom clipboard;
 386         int res;
 387
 388         free(sel.clip);
 389         sel.clip = str;
 390
 391         res = XSetSelectionOwner(xw.dis, XA_PRIMARY, xw.win, CurrentTime);
 392         switch(res) {
 393                 case BadAtom:
 394                 case BadWindow:
 395                         fprintf(stderr, "Invalid copy, XSetSelectionOwner");
 396                         return;
 397         }
 398
 399         clipboard = XInternAtom(xw.dis, "CLIPBOARD", 0);
 400         res = XSetSelectionOwner(xw.dis, clipboard, xw.win, CurrentTime);
 401         switch(res) {
 402                 case BadAtom:
 403                 case BadWindow:
 404                         fprintf(stderr, "Invalid copy, XSetSelectionOwner");
 405                         return;
 406         }
 407
 408         XFlush(xw.dis);
 409 }
 410
 411 /* TODO: doubleclick to select word */
 412 static void brelease(XEvent *e) {
 413         int b;
 414         sel.mode = 0;
 415         getbuttoninfo(e, &b, &sel.ex, &sel.ey);
 416         if(sel.bx==sel.ex && sel.by==sel.ey) {
 417                 sel.bx = -1;
 418                 if(b==2)
 419                         selpaste();
 420         } else {
 421                 if(b==1)
 422                         selcopy(getseltext());
 423         }
 424         draw(1);
 425 }
 426
 427 static void bmotion(XEvent *e) {
 428         if (sel.mode) {
 429                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 430                 draw(1);
 431         }
 432 }
 433
 434 #ifdef DEBUG
 435 void
 436 tdump(void) {
 437         int row, col;
 438         Glyph c;
 439
 440         for(row = 0; row < term.row; row++) {
 441                 for(col = 0; col < term.col; col++) {
 442                         if(col == term.c.x && row == term.c.y)
 443                                 putchar('#');
 444                         else {
 445                                 c = term.line[row][col];
 446                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 447                         }
 448                 }
 449                 putchar('\n');
 450         }
 451 }
 452 #endif
 453
 454 void
 455 die(const char *errstr, ...) {
 456         va_list ap;
 457
 458         va_start(ap, errstr);
 459         vfprintf(stderr, errstr, ap);
 460         va_end(ap);
 461         exit(EXIT_FAILURE);
 462 }
 463
 464 void
 465 execsh(void) {
 466         char *args[] = {getenv("SHELL"), "-i", NULL};
 467         if(opt_cmd)
 468                 args[0] = opt_cmd, args[1] = NULL;
 469         else
 470                 DEFAULT(args[0], SHELL);
 471         putenv("TERM="TNAME);
 472         execvp(args[0], args);
 473 }
 474
 475 void
 476 sigchld(int a) {
 477         int stat = 0;
 478         if(waitpid(pid, &stat, 0) < 0)
 479                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 480         if(WIFEXITED(stat))
 481                 exit(WEXITSTATUS(stat));
 482         else
 483                 exit(EXIT_FAILURE);
 484 }
 485
 486 void
 487 ttynew(void) {
 488         int m, s;
 489
 490         /* seems to work fine on linux, openbsd and freebsd */
 491         struct winsize w = {term.row, term.col, 0, 0};
 492         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 493                 die("openpty failed: %s\n", SERRNO);
 494
 495         switch(pid = fork()) {
 496         case -1:
 497                 die("fork failed\n");
 498                 break;
 499         case 0:
 500                 setsid(); /* create a new process group */
 501                 dup2(s, STDIN_FILENO);
 502                 dup2(s, STDOUT_FILENO);
 503                 dup2(s, STDERR_FILENO);
 504                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 505                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 506                 close(s);
 507                 close(m);
 508                 execsh();
 509                 break;
 510         default:
 511                 close(s);
 512                 cmdfd = m;
 513                 signal(SIGCHLD, sigchld);
 514         }
 515 }
 516
 517 void
 518 dump(char c) {
 519         static int col;
 520         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 521         if(++col % 10 == 0)
 522                 fprintf(stderr, "\n");
 523 }
 524
 525 void
 526 ttyread(void) {
 527         char buf[BUFSIZ];
 528         int ret;
 529
 530         if((ret = read(cmdfd, buf, LEN(buf))) < 0)
 531                 die("Couldn't read from shell: %s\n", SERRNO);
 532         else
 533                 tputs(buf, ret);
 534 }
 535
 536 void
 537 ttywrite(const char *s, size_t n) {
 538         if(write(cmdfd, s, n) == -1)
 539                 die("write error on tty: %s\n", SERRNO);
 540 }
 541
 542 void
 543 ttyresize(int x, int y) {
 544         struct winsize w;
 545
 546         w.ws_row = term.row;
 547         w.ws_col = term.col;
 548         w.ws_xpixel = w.ws_ypixel = 0;
 549         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 550                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 551 }
 552
 553 void
 554 tcursor(int mode) {
 555         static TCursor c;
 556
 557         if(mode == CURSOR_SAVE)
 558                 c = term.c;
 559         else if(mode == CURSOR_LOAD)
 560                 term.c = c, tmoveto(c.x, c.y);
 561 }
 562
 563 void
 564 treset(void) {
 565         term.c = (TCursor){{
 566                 .mode = ATTR_NULL,
 567                 .fg = DefaultFG,
 568                 .bg = DefaultBG
 569         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 570
 571         term.top = 0, term.bot = term.row - 1;
 572         term.mode = MODE_WRAP;
 573         tclearregion(0, 0, term.col-1, term.row-1);
 574 }
 575
 576 void
 577 tnew(int col, int row) {
 578         /* set screen size */
 579         term.row = row, term.col = col;
 580         term.line = malloc(term.row * sizeof(Line));
 581         term.alt  = malloc(term.row * sizeof(Line));
 582         for(row = 0 ; row < term.row; row++) {
 583                 term.line[row] = malloc(term.col * sizeof(Glyph));
 584                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 585         }
 586         /* setup screen */
 587         treset();
 588 }
 589
 590 void
 591 tswapscreen(void) {
 592         Line* tmp = term.line;
 593         term.line = term.alt;
 594         term.alt = tmp;
 595         term.mode ^= MODE_ALTSCREEN;
 596 }
 597
 598 void
 599 tscrolldown(int orig, int n) {
 600         int i;
 601         Line temp;
 602
 603         LIMIT(n, 0, term.bot-orig+1);
 604
 605         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 606
 607         for(i = term.bot; i >= orig+n; i--) {
 608                 temp = term.line[i];
 609                 term.line[i] = term.line[i-n];
 610                 term.line[i-n] = temp;
 611         }
 612 }
 613
 614 void
 615 tscrollup(int orig, int n) {
 616         int i;
 617         Line temp;
 618         LIMIT(n, 0, term.bot-orig+1);
 619
 620         tclearregion(0, orig, term.col-1, orig+n-1);
 621
 622         for(i = orig; i <= term.bot-n; i++) {
 623                  temp = term.line[i];
 624                  term.line[i] = term.line[i+n];
 625                  term.line[i+n] = temp;
 626         }
 627 }
 628
 629 void
 630 tnewline(int first_col) {
 631         int y = term.c.y;
 632         if(y == term.bot)
 633                 tscrollup(term.top, 1);
 634         else
 635                 y++;
 636         tmoveto(first_col ? 0 : term.c.x, y);
 637 }
 638
 639 void
 640 csiparse(void) {
 641         /* int noarg = 1; */
 642         char *p = escseq.buf;
 643
 644         escseq.narg = 0;
 645         if(*p == '?')
 646                 escseq.priv = 1, p++;
 647
 648         while(p < escseq.buf+escseq.len) {
 649                 while(isdigit(*p)) {
 650                         escseq.arg[escseq.narg] *= 10;
 651                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 652                 }
 653                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 654                         escseq.narg++, p++;
 655                 else {
 656                         escseq.mode = *p;
 657                         escseq.narg++;
 658                         return;
 659                 }
 660         }
 661 }
 662
 663 void
 664 tmoveto(int x, int y) {
 665         LIMIT(x, 0, term.col-1);
 666         LIMIT(y, 0, term.row-1);
 667         term.c.state &= ~CURSOR_WRAPNEXT;
 668         term.c.x = x;
 669         term.c.y = y;
 670 }
 671
 672 void
 673 tsetchar(char c) {
 674         term.line[term.c.y][term.c.x] = term.c.attr;
 675         term.line[term.c.y][term.c.x].c = c;
 676         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 677 }
 678
 679 void
 680 tclearregion(int x1, int y1, int x2, int y2) {
 681         int x, y, temp;
 682
 683         if(x1 > x2)
 684                 temp = x1, x1 = x2, x2 = temp;
 685         if(y1 > y2)
 686                 temp = y1, y1 = y2, y2 = temp;
 687
 688         LIMIT(x1, 0, term.col-1);
 689         LIMIT(x2, 0, term.col-1);
 690         LIMIT(y1, 0, term.row-1);
 691         LIMIT(y2, 0, term.row-1);
 692
 693         for(y = y1; y <= y2; y++)
 694                 for(x = x1; x <= x2; x++)
 695                         term.line[y][x].state = 0;
 696 }
 697
 698 void
 699 tdeletechar(int n) {
 700         int src = term.c.x + n;
 701         int dst = term.c.x;
 702         int size = term.col - src;
 703
 704         if(src >= term.col) {
 705                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 706                 return;
 707         }
 708         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 709         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 710 }
 711
 712 void
 713 tinsertblank(int n) {
 714         int src = term.c.x;
 715         int dst = src + n;
 716         int size = term.col - dst;
 717
 718         if(dst >= term.col) {
 719                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 720                 return;
 721         }
 722         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 723         tclearregion(src, term.c.y, dst - 1, term.c.y);
 724 }
 725
 726 void
 727 tinsertblankline(int n) {
 728         if(term.c.y < term.top || term.c.y > term.bot)
 729                 return;
 730
 731         tscrolldown(term.c.y, n);
 732 }
 733
 734 void
 735 tdeleteline(int n) {
 736         if(term.c.y < term.top || term.c.y > term.bot)
 737                 return;
 738
 739         tscrollup(term.c.y, n);
 740 }
 741
 742 void
 743 tsetattr(int *attr, int l) {
 744         int i;
 745
 746         for(i = 0; i < l; i++) {
 747                 switch(attr[i]) {
 748                 case 0:
 749                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 750                         term.c.attr.fg = DefaultFG;
 751                         term.c.attr.bg = DefaultBG;
 752                         break;
 753                 case 1:
 754                         term.c.attr.mode |= ATTR_BOLD;
 755                         break;
 756                 case 4:
 757                         term.c.attr.mode |= ATTR_UNDERLINE;
 758                         break;
 759                 case 7:
 760                         term.c.attr.mode |= ATTR_REVERSE;
 761                         break;
 762                 case 22:
 763                         term.c.attr.mode &= ~ATTR_BOLD;
 764                         break;
 765                 case 24:
 766                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 767                         break;
 768                 case 27:
 769                         term.c.attr.mode &= ~ATTR_REVERSE;
 770                         break;
 771                 case 38:
 772                         if (i + 2 < l && attr[i + 1] == 5) {
 773                                 i += 2;
 774                                 if (BETWEEN(attr[i], 0, 255))
 775                                         term.c.attr.fg = attr[i];
 776                                 else
 777                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 778                         }
 779                         else
 780                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 781                         break;
 782                 case 39:
 783                         term.c.attr.fg = DefaultFG;
 784                         break;
 785                 case 48:
 786                         if (i + 2 < l && attr[i + 1] == 5) {
 787                                 i += 2;
 788                                 if (BETWEEN(attr[i], 0, 255))
 789                                         term.c.attr.bg = attr[i];
 790                                 else
 791                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 792                         }
 793                         else
 794                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 795                         break;
 796                 case 49:
 797                         term.c.attr.bg = DefaultBG;
 798                         break;
 799                 default:
 800                         if(BETWEEN(attr[i], 30, 37))
 801                                 term.c.attr.fg = attr[i] - 30;
 802                         else if(BETWEEN(attr[i], 40, 47))
 803                                 term.c.attr.bg = attr[i] - 40;
 804                         else if(BETWEEN(attr[i], 90, 97))
 805                                 term.c.attr.fg = attr[i] - 90 + 8;
 806                         else if(BETWEEN(attr[i], 100, 107))
 807                                 term.c.attr.fg = attr[i] - 100 + 8;
 808                         else
 809                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
 810
 811                         break;
 812                 }
 813         }
 814 }
 815
 816 void
 817 tsetscroll(int t, int b) {
 818         int temp;
 819
 820         LIMIT(t, 0, term.row-1);
 821         LIMIT(b, 0, term.row-1);
 822         if(t > b) {
 823                 temp = t;
 824                 t = b;
 825                 b = temp;
 826         }
 827         term.top = t;
 828         term.bot = b;
 829 }
 830
 831 void
 832 csihandle(void) {
 833         switch(escseq.mode) {
 834         default:
 835         unknown:
 836                 printf("erresc: unknown csi ");
 837                 csidump();
 838                 /* die(""); */
 839                 break;
 840         case '@': /* ICH -- Insert <n> blank char */
 841                 DEFAULT(escseq.arg[0], 1);
 842                 tinsertblank(escseq.arg[0]);
 843                 break;
 844         case 'A': /* CUU -- Cursor <n> Up */
 845         case 'e':
 846                 DEFAULT(escseq.arg[0], 1);
 847                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 848                 break;
 849         case 'B': /* CUD -- Cursor <n> Down */
 850                 DEFAULT(escseq.arg[0], 1);
 851                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 852                 break;
 853         case 'C': /* CUF -- Cursor <n> Forward */
 854         case 'a':
 855                 DEFAULT(escseq.arg[0], 1);
 856                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 857                 break;
 858         case 'D': /* CUB -- Cursor <n> Backward */
 859                 DEFAULT(escseq.arg[0], 1);
 860                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 861                 break;
 862         case 'E': /* CNL -- Cursor <n> Down and first col */
 863                 DEFAULT(escseq.arg[0], 1);
 864                 tmoveto(0, term.c.y+escseq.arg[0]);
 865                 break;
 866         case 'F': /* CPL -- Cursor <n> Up and first col */
 867                 DEFAULT(escseq.arg[0], 1);
 868                 tmoveto(0, term.c.y-escseq.arg[0]);
 869                 break;
 870         case 'G': /* CHA -- Move to <col> */
 871         case '`': /* XXX: HPA -- same? */
 872                 DEFAULT(escseq.arg[0], 1);
 873                 tmoveto(escseq.arg[0]-1, term.c.y);
 874                 break;
 875         case 'H': /* CUP -- Move to <row> <col> */
 876         case 'f': /* XXX: HVP -- same? */
 877                 DEFAULT(escseq.arg[0], 1);
 878                 DEFAULT(escseq.arg[1], 1);
 879                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 880                 break;
 881         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 882         case 'J': /* ED -- Clear screen */
 883                 switch(escseq.arg[0]) {
 884                 case 0: /* below */
 885                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 886                         break;
 887                 case 1: /* above */
 888                         tclearregion(0, 0, term.c.x, term.c.y);
 889                         break;
 890                 case 2: /* all */
 891                         tclearregion(0, 0, term.col-1, term.row-1);
 892                         break;
 893                 default:
 894                         goto unknown;
 895                 }
 896                 break;
 897         case 'K': /* EL -- Clear line */
 898                 switch(escseq.arg[0]) {
 899                 case 0: /* right */
 900                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 901                         break;
 902                 case 1: /* left */
 903                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 904                         break;
 905                 case 2: /* all */
 906                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 907                         break;
 908                 }
 909                 break;
 910         case 'S': /* SU -- Scroll <n> line up */
 911                 DEFAULT(escseq.arg[0], 1);
 912                 tscrollup(term.top, escseq.arg[0]);
 913                 break;
 914         case 'T': /* SD -- Scroll <n> line down */
 915                 DEFAULT(escseq.arg[0], 1);
 916                 tscrolldown(term.top, escseq.arg[0]);
 917                 break;
 918         case 'L': /* IL -- Insert <n> blank lines */
 919                 DEFAULT(escseq.arg[0], 1);
 920                 tinsertblankline(escseq.arg[0]);
 921                 break;
 922         case 'l': /* RM -- Reset Mode */
 923                 if(escseq.priv) {
 924                         switch(escseq.arg[0]) {
 925                         case 1:
 926                                 term.mode &= ~MODE_APPKEYPAD;
 927                                 break;
 928                         case 5: /* TODO: DECSCNM -- Remove reverse video */
 929                                 break;
 930                         case 7:
 931                                 term.mode &= ~MODE_WRAP;
 932                                 break;
 933                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 934                                 break;
 935                         case 20:
 936                                 term.mode &= ~MODE_CRLF;
 937                                 break;
 938                         case 25:
 939                                 term.c.state |= CURSOR_HIDE;
 940                                 break;
 941                         case 1049: /* = 1047 and 1048 */
 942                         case 1047:
 943                                 if(IS_SET(MODE_ALTSCREEN)) {
 944                                         tclearregion(0, 0, term.col-1, term.row-1);
 945                                         tswapscreen();
 946                                 }
 947                                 if(escseq.arg[0] == 1047)
 948                                         break;
 949                         case 1048:
 950                                 tcursor(CURSOR_LOAD);
 951                                 break;
 952                         default:
 953                                 goto unknown;
 954                         }
 955                 } else {
 956                         switch(escseq.arg[0]) {
 957                         case 4:
 958                                 term.mode &= ~MODE_INSERT;
 959                                 break;
 960                         default:
 961                                 goto unknown;
 962                         }
 963                 }
 964                 break;
 965         case 'M': /* DL -- Delete <n> lines */
 966                 DEFAULT(escseq.arg[0], 1);
 967                 tdeleteline(escseq.arg[0]);
 968                 break;
 969         case 'X': /* ECH -- Erase <n> char */
 970                 DEFAULT(escseq.arg[0], 1);
 971                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 972                 break;
 973         case 'P': /* DCH -- Delete <n> char */
 974                 DEFAULT(escseq.arg[0], 1);
 975                 tdeletechar(escseq.arg[0]);
 976                 break;
 977         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 978         case 'd': /* VPA -- Move to <row> */
 979                 DEFAULT(escseq.arg[0], 1);
 980                 tmoveto(term.c.x, escseq.arg[0]-1);
 981                 break;
 982         case 'h': /* SM -- Set terminal mode */
 983                 if(escseq.priv) {
 984                         switch(escseq.arg[0]) {
 985                         case 1:
 986                                 term.mode |= MODE_APPKEYPAD;
 987                                 break;
 988                         case 5: /* DECSCNM -- Reverve video */
 989                                 /* TODO: set REVERSE on the whole screen (f) */
 990                                 break;
 991                         case 7:
 992                                 term.mode |= MODE_WRAP;
 993                                 break;
 994                         case 20:
 995                                 term.mode |= MODE_CRLF;
 996                                 break;
 997                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 998                                  /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
 999                                 if(escseq.narg > 1 && escseq.arg[1] != 25)
1000                                         break;
1001                         case 25:
1002                                 term.c.state &= ~CURSOR_HIDE;
1003                                 break;
1004                         case 1049: /* = 1047 and 1048 */
1005                         case 1047:
1006                                 if(IS_SET(MODE_ALTSCREEN))
1007                                         tclearregion(0, 0, term.col-1, term.row-1);
1008                                 else
1009                                         tswapscreen();
1010                                 if(escseq.arg[0] == 1047)
1011                                         break;
1012                         case 1048:
1013                                 tcursor(CURSOR_SAVE);
1014                                 break;
1015                         default: goto unknown;
1016                         }
1017                 } else {
1018                         switch(escseq.arg[0]) {
1019                         case 4:
1020                                 term.mode |= MODE_INSERT;
1021                                 break;
1022                         default: goto unknown;
1023                         }
1024                 };
1025                 break;
1026         case 'm': /* SGR -- Terminal attribute (color) */
1027                 tsetattr(escseq.arg, escseq.narg);
1028                 break;
1029         case 'r': /* DECSTBM -- Set Scrolling Region */
1030                 if(escseq.priv)
1031                         goto unknown;
1032                 else {
1033                         DEFAULT(escseq.arg[0], 1);
1034                         DEFAULT(escseq.arg[1], term.row);
1035                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1036                         tmoveto(0, 0);
1037                 }
1038                 break;
1039         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1040                 tcursor(CURSOR_SAVE);
1041                 break;
1042         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1043                 tcursor(CURSOR_LOAD);
1044                 break;
1045         }
1046 }
1047
1048 void
1049 csidump(void) {
1050         int i;
1051         printf("ESC [ %s", escseq.priv ? "? " : "");
1052         if(escseq.narg)
1053                 for(i = 0; i < escseq.narg; i++)
1054                         printf("%d ", escseq.arg[i]);
1055         if(escseq.mode)
1056                 putchar(escseq.mode);
1057         putchar('\n');
1058 }
1059
1060 void
1061 csireset(void) {
1062         memset(&escseq, 0, sizeof(escseq));
1063 }
1064
1065 void
1066 tputtab(void) {
1067         int space = TAB - term.c.x % TAB;
1068         tmoveto(term.c.x + space, term.c.y);
1069 }
1070
1071 void
1072 tputc(char c) {
1073         if(term.esc & ESC_START) {
1074                 if(term.esc & ESC_CSI) {
1075                         escseq.buf[escseq.len++] = c;
1076                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1077                                 term.esc = 0;
1078                                 csiparse(), csihandle();
1079                         }
1080                         /* TODO: handle other OSC */
1081                 } else if(term.esc & ESC_OSC) {
1082                         if(c == ';') {
1083                                 term.titlelen = 0;
1084                                 term.esc = ESC_START | ESC_TITLE;
1085                         }
1086                 } else if(term.esc & ESC_TITLE) {
1087                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1088                                 term.esc = 0;
1089                                 term.title[term.titlelen] = '\0';
1090                                 XStoreName(xw.dis, xw.win, term.title);
1091                         } else {
1092                                 term.title[term.titlelen++] = c;
1093                         }
1094                 } else if(term.esc & ESC_ALTCHARSET) {
1095                         switch(c) {
1096                         case '0': /* Line drawing crap */
1097                                 term.c.attr.mode |= ATTR_GFX;
1098                                 break;
1099                         case 'B': /* Back to regular text */
1100                                 term.c.attr.mode &= ~ATTR_GFX;
1101                                 break;
1102                         default:
1103                                 printf("esc unhandled charset: ESC ( %c\n", c);
1104                         }
1105                         term.esc = 0;
1106                 } else {
1107                         switch(c) {
1108                         case '[':
1109                                 term.esc |= ESC_CSI;
1110                                 break;
1111                         case ']':
1112                                 term.esc |= ESC_OSC;
1113                                 break;
1114                         case '(':
1115                                 term.esc |= ESC_ALTCHARSET;
1116                                 break;
1117                         case 'D': /* IND -- Linefeed */
1118                                 if(term.c.y == term.bot)
1119                                         tscrollup(term.top, 1);
1120                                 else
1121                                         tmoveto(term.c.x, term.c.y+1);
1122                                 term.esc = 0;
1123                                 break;
1124                         case 'E': /* NEL -- Next line */
1125                                 tnewline(1); /* always go to first col */
1126                                 term.esc = 0;
1127                                 break;
1128                         case 'M': /* RI -- Reverse index */
1129                                 if(term.c.y == term.top)
1130                                         tscrolldown(term.top, 1);
1131                                 else
1132                                         tmoveto(term.c.x, term.c.y-1);
1133                                 term.esc = 0;
1134                                 break;
1135                         case 'c': /* RIS -- Reset to inital state */
1136                                 treset();
1137                                 term.esc = 0;
1138                                 break;
1139                         case '=': /* DECPAM -- Application keypad */
1140                                 term.mode |= MODE_APPKEYPAD;
1141                                 term.esc = 0;
1142                                 break;
1143                         case '>': /* DECPNM -- Normal keypad */
1144                                 term.mode &= ~MODE_APPKEYPAD;
1145                                 term.esc = 0;
1146                                 break;
1147                         case '7': /* DECSC -- Save Cursor */
1148                                 tcursor(CURSOR_SAVE);
1149                                 term.esc = 0;
1150                                 break;
1151                         case '8': /* DECRC -- Restore Cursor */
1152                                 tcursor(CURSOR_LOAD);
1153                                 term.esc = 0;
1154                                 break;
1155                         default:
1156                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
1157                                 term.esc = 0;
1158                         }
1159                 }
1160         } else {
1161                 switch(c) {
1162                 case '\t':
1163                         tputtab();
1164                         break;
1165                 case '\b':
1166                         tmoveto(term.c.x-1, term.c.y);
1167                         break;
1168                 case '\r':
1169                         tmoveto(0, term.c.y);
1170                         break;
1171                 case '\f':
1172                 case '\v':
1173                 case '\n':
1174                         /* go to first col if the mode is set */
1175                         tnewline(IS_SET(MODE_CRLF));
1176                         break;
1177                 case '\a':
1178                         if(!(xw.state & WIN_FOCUSED))
1179                                 xseturgency(1);
1180                         break;
1181                 case '\033':
1182                         csireset();
1183                         term.esc = ESC_START;
1184                         break;
1185                 default:
1186                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1187                                 tnewline(1); /* always go to first col */
1188                         tsetchar(c);
1189                         if(term.c.x+1 < term.col)
1190                                 tmoveto(term.c.x+1, term.c.y);
1191                         else
1192                                 term.c.state |= CURSOR_WRAPNEXT;
1193                         break;
1194                 }
1195         }
1196 }
1197
1198 void
1199 tputs(char *s, int len) {
1200         for(; len > 0; len--)
1201                 tputc(*s++);
1202 }
1203
1204 void
1205 tresize(int col, int row) {
1206         int i, x;
1207         int minrow = MIN(row, term.row);
1208         int mincol = MIN(col, term.col);
1209         int slide = term.c.y - row + 1;
1210
1211         if(col < 1 || row < 1)
1212                 return;
1213
1214         /* free unneeded rows */
1215         i = 0;
1216         if(slide > 0) {
1217                 /* slide screen to keep cursor where we expect it -
1218                  * tscrollup would work here, but we can optimize to
1219                  * memmove because we're freeing the earlier lines */
1220                 for(/* i = 0 */; i < slide; i++) {
1221                         free(term.line[i]);
1222                         free(term.alt[i]);
1223                 }
1224                 memmove(term.line, term.line + slide, row * sizeof(Line));
1225                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1226         }
1227         for(i += row; i < term.row; i++) {
1228                 free(term.line[i]);
1229                 free(term.alt[i]);
1230         }
1231
1232         /* resize to new height */
1233         term.line = realloc(term.line, row * sizeof(Line));
1234         term.alt  = realloc(term.alt,  row * sizeof(Line));
1235
1236         /* resize each row to new width, zero-pad if needed */
1237         for(i = 0; i < minrow; i++) {
1238                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1239                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1240                 for(x = mincol; x < col; x++) {
1241                         term.line[i][x].state = 0;
1242                         term.alt[i][x].state = 0;
1243                 }
1244         }
1245
1246         /* allocate any new rows */
1247         for(/* i == minrow */; i < row; i++) {
1248                 term.line[i] = calloc(col, sizeof(Glyph));
1249                 term.alt [i] = calloc(col, sizeof(Glyph));
1250         }
1251
1252         /* update terminal size */
1253         term.col = col, term.row = row;
1254         /* make use of the LIMIT in tmoveto */
1255         tmoveto(term.c.x, term.c.y);
1256         /* reset scrolling region */
1257         tsetscroll(0, row-1);
1258 }
1259
1260 void
1261 xloadcols(void) {
1262         int i, r, g, b;
1263         XColor color;
1264         unsigned long white = WhitePixel(xw.dis, xw.scr);
1265
1266         for(i = 0; i < 16; i++) {
1267                 if (!XAllocNamedColor(xw.dis, xw.cmap, colorname[i], &color, &color)) {
1268                         dc.col[i] = white;
1269                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1270                 } else
1271                         dc.col[i] = color.pixel;
1272         }
1273
1274         /* same colors as xterm */
1275         for(r = 0; r < 6; r++)
1276                 for(g = 0; g < 6; g++)
1277                         for(b = 0; b < 6; b++) {
1278                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1279                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1280                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1281                                 if (!XAllocColor(xw.dis, xw.cmap, &color)) {
1282                                         dc.col[i] = white;
1283                                         fprintf(stderr, "Could not allocate color %d\n", i);
1284                                 } else
1285                                         dc.col[i] = color.pixel;
1286                                 i++;
1287                         }
1288
1289         for(r = 0; r < 24; r++, i++) {
1290                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1291                 if (!XAllocColor(xw.dis, xw.cmap, &color)) {
1292                         dc.col[i] = white;
1293                         fprintf(stderr, "Could not allocate color %d\n", i);
1294                 } else
1295                         dc.col[i] = color.pixel;
1296         }
1297 }
1298
1299 void
1300 xclear(int x1, int y1, int x2, int y2) {
1301         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1302         XFillRectangle(xw.dis, xw.buf, dc.gc,
1303                        x1 * xw.cw, y1 * xw.ch,
1304                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1305 }
1306
1307 void
1308 xhints(void)
1309 {
1310         XClassHint class = {TNAME, TNAME};
1311         XWMHints wm = {.flags = InputHint, .input = 1};
1312         XSizeHints size = {
1313                 .flags = PSize | PResizeInc | PBaseSize,
1314                 .height = xw.h,
1315                 .width = xw.w,
1316                 .height_inc = xw.ch,
1317                 .width_inc = xw.cw,
1318                 .base_height = 2*BORDER,
1319                 .base_width = 2*BORDER,
1320         };
1321         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1322 }
1323
1324 void
1325 xinit(void) {
1326         XSetWindowAttributes attrs;
1327
1328         if(!(xw.dis = XOpenDisplay(NULL)))
1329                 die("Can't open display\n");
1330         xw.scr = XDefaultScreen(xw.dis);
1331
1332         /* font */
1333         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1334                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1335
1336         /* XXX: Assuming same size for bold font */
1337         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1338         xw.ch = dc.font->ascent + dc.font->descent;
1339
1340         /* colors */
1341         xw.cmap = XDefaultColormap(xw.dis, xw.scr);
1342         xloadcols();
1343
1344         /* window - default size */
1345         xw.bufh = 24 * xw.ch;
1346         xw.bufw = 80 * xw.cw;
1347         xw.h = xw.bufh + 2*BORDER;
1348         xw.w = xw.bufw + 2*BORDER;
1349
1350         attrs.background_pixel = dc.col[DefaultBG];
1351         attrs.border_pixel = dc.col[DefaultBG];
1352         attrs.bit_gravity = NorthWestGravity;
1353         attrs.event_mask = FocusChangeMask | KeyPressMask
1354                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1355                 | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
1356         attrs.colormap = xw.cmap;
1357
1358         xw.win = XCreateWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1359                         xw.w, xw.h, 0, XDefaultDepth(xw.dis, xw.scr), InputOutput,
1360                         XDefaultVisual(xw.dis, xw.scr),
1361                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1362                         | CWColormap,
1363                         &attrs);
1364         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1365
1366
1367         /* input methods */
1368         xw.xim = XOpenIM(xw.dis, NULL, NULL, NULL);
1369         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1370                                            | XIMStatusNothing, XNClientWindow, xw.win,
1371                                            XNFocusWindow, xw.win, NULL);
1372         /* gc */
1373         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1374
1375         XMapWindow(xw.dis, xw.win);
1376         xhints();
1377         XStoreName(xw.dis, xw.win, opt_title ? opt_title : "st");
1378         XSync(xw.dis, 0);
1379 }
1380
1381 void
1382 xdraws(char *s, Glyph base, int x, int y, int len) {
1383         unsigned long xfg, xbg;
1384         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1385         int i;
1386
1387         if(base.mode & ATTR_REVERSE)
1388                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1389         else
1390                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1391
1392         XSetBackground(xw.dis, dc.gc, xbg);
1393         XSetForeground(xw.dis, dc.gc, xfg);
1394
1395         if(base.mode & ATTR_GFX)
1396                 for(i = 0; i < len; i++) {
1397                         char c = gfx[(unsigned int)s[i] % 256];
1398                         if(c)
1399                                 s[i] = c;
1400                         else if(s[i] > 0x5f)
1401                                 s[i] -= 0x5f;
1402                 }
1403
1404         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1405         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1406
1407         if(base.mode & ATTR_UNDERLINE)
1408                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1409 }
1410
1411 void
1412 xdrawcursor(void) {
1413         static int oldx = 0;
1414         static int oldy = 0;
1415         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1416
1417         LIMIT(oldx, 0, term.col-1);
1418         LIMIT(oldy, 0, term.row-1);
1419
1420         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1421                 g.c = term.line[term.c.y][term.c.x].c;
1422
1423         /* remove the old cursor */
1424         if(term.line[oldy][oldx].state & GLYPH_SET)
1425                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1426         else
1427                 xclear(oldx, oldy, oldx, oldy);
1428
1429         /* draw the new one */
1430         if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1431                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1432                 oldx = term.c.x, oldy = term.c.y;
1433         }
1434 }
1435
1436 #ifdef DEBUG
1437 /* basic drawing routines */
1438 void
1439 xdrawc(int x, int y, Glyph g) {
1440         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1441         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1442         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1443         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1444         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1445 }
1446
1447 void
1448 draw(int dummy) {
1449         int x, y;
1450
1451         xclear(0, 0, term.col-1, term.row-1);
1452         for(y = 0; y < term.row; y++)
1453                 for(x = 0; x < term.col; x++)
1454                         if(term.line[y][x].state & GLYPH_SET)
1455                                 xdrawc(x, y, term.line[y][x]);
1456
1457         xdrawcursor();
1458         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1459         XFlush(xw.dis);
1460 }
1461
1462 #else
1463 /* optimized drawing routine */
1464 void
1465 draw(int redraw_all) {
1466         int i, x, y, ox;
1467         Glyph base, new;
1468         char buf[DRAW_BUF_SIZ];
1469
1470         if(!(xw.state & WIN_VISIBLE))
1471                 return;
1472
1473         xclear(0, 0, term.col-1, term.row-1);
1474         for(y = 0; y < term.row; y++) {
1475                 base = term.line[y][0];
1476                 i = ox = 0;
1477                 for(x = 0; x < term.col; x++) {
1478                         new = term.line[y][x];
1479                         if(sel.bx!=-1 && new.c && selected(x, y))
1480                                 new.mode ^= ATTR_REVERSE;
1481                         if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1482                                         i >= DRAW_BUF_SIZ)) {
1483                                 xdraws(buf, base, ox, y, i);
1484                                 i = 0;
1485                         }
1486                         if(new.state & GLYPH_SET) {
1487                                 if(i == 0) {
1488                                         ox = x;
1489                                         base = new;
1490                                 }
1491                                 buf[i++] = new.c;
1492                         }
1493                 }
1494                 if(i > 0)
1495                         xdraws(buf, base, ox, y, i);
1496         }
1497         xdrawcursor();
1498         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1499 }
1500
1501 #endif
1502
1503 void
1504 expose(XEvent *ev) {
1505         XExposeEvent *e = &ev->xexpose;
1506         if(xw.state & WIN_REDRAW) {
1507                 if(!e->count) {
1508                         xw.state &= ~WIN_REDRAW;
1509                         draw(SCREEN_REDRAW);
1510                 }
1511         } else
1512                 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1513                                 e->width, e->height, e->x, e->y);
1514 }
1515
1516 void
1517 visibility(XEvent *ev) {
1518         XVisibilityEvent *e = &ev->xvisibility;
1519         if(e->state == VisibilityFullyObscured)
1520                 xw.state &= ~WIN_VISIBLE;
1521         else if(!(xw.state & WIN_VISIBLE))
1522                 /* need a full redraw for next Expose, not just a buf copy */
1523                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1524 }
1525
1526 void
1527 unmap(XEvent *ev) {
1528         xw.state &= ~WIN_VISIBLE;
1529 }
1530
1531 void
1532 xseturgency(int add) {
1533         XWMHints *h = XGetWMHints(xw.dis, xw.win);
1534         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1535         XSetWMHints(xw.dis, xw.win, h);
1536         XFree(h);
1537 }
1538
1539 void
1540 focus(XEvent *ev) {
1541         if(ev->type == FocusIn) {
1542                 xw.state |= WIN_FOCUSED;
1543                 xseturgency(0);
1544         } else
1545                 xw.state &= ~WIN_FOCUSED;
1546         draw(SCREEN_UPDATE);
1547 }
1548
1549 char*
1550 kmap(KeySym k) {
1551         int i;
1552         for(i = 0; i < LEN(key); i++)
1553                 if(key[i].k == k)
1554                         return (char*)key[i].s;
1555         return NULL;
1556 }
1557
1558 void
1559 kpress(XEvent *ev) {
1560         XKeyEvent *e = &ev->xkey;
1561         KeySym ksym;
1562         char buf[32];
1563         char *customkey;
1564         int len;
1565         int meta;
1566         int shift;
1567         Status status;
1568
1569         meta = e->state & Mod1Mask;
1570         shift = e->state & ShiftMask;
1571         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1572
1573         /* 1. custom keys from config.h */
1574         if((customkey = kmap(ksym)))
1575                 ttywrite(customkey, strlen(customkey));
1576         /* 2. hardcoded (overrides X lookup) */
1577         else
1578                 switch(ksym) {
1579                 case XK_Up:
1580                 case XK_Down:
1581                 case XK_Left:
1582                 case XK_Right:
1583                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1584                         ttywrite(buf, 3);
1585                         break;
1586                 case XK_Insert:
1587                         if(shift)
1588                                 selpaste();
1589                         break;
1590                 case XK_Return:
1591                         if(IS_SET(MODE_CRLF))
1592                                 ttywrite("\r\n", 2);
1593                         else
1594                                 ttywrite("\r", 1);
1595                         break;
1596                         /* 3. X lookup  */
1597                 default:
1598                         if(len > 0) {
1599                                 buf[sizeof(buf)-1] = '\0';
1600                                 if(meta && len == 1)
1601                                         ttywrite("\033", 1);
1602                                 ttywrite(buf, len);
1603                         } else /* 4. nothing to send */
1604                                 fprintf(stderr, "errkey: %d\n", (int)ksym);
1605                         break;
1606                 }
1607 }
1608
1609 void
1610 resize(XEvent *e) {
1611         int col, row;
1612
1613         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1614                 return;
1615
1616         xw.w = e->xconfigure.width;
1617         xw.h = e->xconfigure.height;
1618         xw.bufw = xw.w - 2*BORDER;
1619         xw.bufh = xw.h - 2*BORDER;
1620         col = xw.bufw / xw.cw;
1621         row = xw.bufh / xw.ch;
1622         tresize(col, row);
1623         ttyresize(col, row);
1624         xw.bufh = MAX(1, xw.bufh);
1625         xw.bufw = MAX(1, xw.bufw);
1626         XFreePixmap(xw.dis, xw.buf);
1627         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1628 }
1629
1630 void
1631 run(void) {
1632         XEvent ev;
1633         fd_set rfd;
1634         int xfd = XConnectionNumber(xw.dis);
1635
1636         for(;;) {
1637                 FD_ZERO(&rfd);
1638                 FD_SET(cmdfd, &rfd);
1639                 FD_SET(xfd, &rfd);
1640                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1641                         if(errno == EINTR)
1642                                 continue;
1643                         die("select failed: %s\n", SERRNO);
1644                 }
1645                 if(FD_ISSET(cmdfd, &rfd)) {
1646                         ttyread();
1647                         draw(SCREEN_UPDATE);
1648                 }
1649                 while(XPending(xw.dis)) {
1650                         XNextEvent(xw.dis, &ev);
1651                         if (XFilterEvent(&ev, xw.win))
1652                                 continue;
1653                         if(handler[ev.type])
1654                                 (handler[ev.type])(&ev);
1655                 }
1656         }
1657 }
1658
1659 int
1660 main(int argc, char *argv[]) {
1661         int i;
1662
1663         for(i = 1; i < argc; i++) {
1664                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1665                 case 't':
1666                         if(++i < argc) opt_title = argv[i];
1667                         break;
1668                 case 'e':
1669                         if(++i < argc) opt_cmd = argv[i];
1670                         break;
1671                 case 'v':
1672                 default:
1673                         die(USAGE);
1674                 }
1675         }
1676         setlocale(LC_CTYPE, "");
1677         tnew(80, 24);
1678         ttynew();
1679         xinit();
1680         selinit();
1681         run();
1682         return 0;
1683 }