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