st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <signal.h>
  13 #include <sys/ioctl.h>
  14 #include <sys/select.h>
  15 #include <sys/stat.h>
  16 #include <sys/types.h>
  17 #include <sys/wait.h>
  18 #include <unistd.h>
  19 #include <X11/Xlib.h>
  20 #include <X11/keysym.h>
  21 #include <X11/Xutil.h>
  22
  23 #if   defined(__linux)
  24  #include <pty.h>
  25 #elif defined(__OpenBSD__) || defined(__NetBSD__)
  26  #include <util.h>
  27 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  28  #include <libutil.h>
  29 #endif
  30
  31 #define USAGE \
  32         "st-" VERSION ", (c) 2010 st engineers\n" \
  33         "usage: st [-t title] [-e cmd] [-v]\n"
  34
  35 /* Arbitrary sizes */
  36 #define ESC_TITLE_SIZ 256
  37 #define ESC_BUF_SIZ   256
  38 #define ESC_ARG_SIZ   16
  39 #define DRAW_BUF_SIZ  1024
  40
  41 #define SERRNO strerror(errno)
  42 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  43 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  44 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  45 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  46 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  47 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  48 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  49 #define IS_SET(flag) (term.mode & (flag))
  50
  51 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  52 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  53 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
  54        CURSOR_SAVE, CURSOR_LOAD };
  55 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  56 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  57 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8 };
  58 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  59 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  60
  61 typedef struct {
  62         char c;     /* character code  */
  63         char mode;  /* attribute flags */
  64         int fg;     /* foreground      */
  65         int bg;     /* background      */
  66         char state; /* state flags     */
  67 } Glyph;
  68
  69 typedef Glyph* Line;
  70
  71 typedef struct {
  72         Glyph attr;      /* current char attributes */
  73         int x;
  74         int y;
  75         char state;
  76 } TCursor;
  77
  78 /* CSI Escape sequence structs */
  79 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  80 typedef struct {
  81         char buf[ESC_BUF_SIZ]; /* raw string */
  82         int len;                           /* raw string length */
  83         char priv;
  84         int arg[ESC_ARG_SIZ];
  85         int narg;                          /* nb of args */
  86         char mode;
  87 } CSIEscape;
  88
  89 /* Internal representation of the screen */
  90 typedef struct {
  91         int row;        /* nb row */
  92         int col;        /* nb col */
  93         Line* line;     /* screen */
  94         Line* alt;      /* alternate screen */
  95         TCursor c;      /* cursor */
  96         int top;        /* top    scroll limit */
  97         int bot;        /* bottom scroll limit */
  98         int mode;       /* terminal mode flags */
  99         int esc;        /* escape state flags */
 100         char title[ESC_TITLE_SIZ];
 101         int titlelen;
 102 } Term;
 103
 104 /* Purely graphic info */
 105 typedef struct {
 106         Display* dis;
 107         Colormap cmap;
 108         Window win;
 109         Pixmap buf;
 110         XIM xim;
 111         XIC xic;
 112         int scr;
 113         int w;  /* window width  */
 114         int h;  /* window height */
 115         int bufw; /* pixmap width  */
 116         int bufh; /* pixmap height */
 117         int ch; /* char height */
 118         int cw; /* char width  */
 119         int focus;
 120         int vis; /* is visible */
 121 } XWindow;
 122
 123 typedef struct {
 124         KeySym k;
 125         char s[ESC_BUF_SIZ];
 126 } Key;
 127
 128 /* Drawing Context */
 129 typedef struct {
 130         unsigned long col[256];
 131         XFontStruct* font;
 132         XFontStruct* bfont;
 133         GC gc;
 134 } DC;
 135
 136 /* TODO: use better name for vars... */
 137 typedef struct {
 138         int mode;
 139         int bx, by;
 140         int ex, ey;
 141         struct {int x, y;}  b, e;
 142         char *clip;
 143 } Selection;
 144
 145 #include "config.h"
 146
 147 static void die(const char *errstr, ...);
 148 static void draw(int);
 149 static void execsh(void);
 150 static void sigchld(int);
 151 static void run(void);
 152
 153 static void csidump(void);
 154 static void csihandle(void);
 155 static void csiparse(void);
 156 static void csireset(void);
 157
 158 static void tclearregion(int, int, int, int);
 159 static void tcursor(int);
 160 static void tdeletechar(int);
 161 static void tdeleteline(int);
 162 static void tinsertblank(int);
 163 static void tinsertblankline(int);
 164 static void tmoveto(int, int);
 165 static void tnew(int, int);
 166 static void tnewline(void);
 167 static void tputtab(void);
 168 static void tputc(char);
 169 static void tputs(char*, int);
 170 static void treset(void);
 171 static void tresize(int, int);
 172 static void tscrollup(int, int);
 173 static void tscrolldown(int, int);
 174 static void tsetattr(int*, int);
 175 static void tsetchar(char);
 176 static void tsetscroll(int, int);
 177 static void tswapscreen(void);
 178
 179 static void ttynew(void);
 180 static void ttyread(void);
 181 static void ttyresize(int, int);
 182 static void ttywrite(const char *, size_t);
 183
 184 static void xdraws(char *, Glyph, int, int, int);
 185 static void xhints(void);
 186 static void xclear(int, int, int, int);
 187 static void xdrawcursor(void);
 188 static void xinit(void);
 189 static void xloadcols(void);
 190 static void xseturgency(int);
 191
 192 static void expose(XEvent *);
 193 static void visibility(XEvent *);
 194 static void unmap(XEvent *);
 195 static char* kmap(KeySym);
 196 static void kpress(XEvent *);
 197 static void resize(XEvent *);
 198 static void focus(XEvent *);
 199 static void brelease(XEvent *);
 200 static void bpress(XEvent *);
 201 static void bmotion(XEvent *);
 202
 203
 204 static void (*handler[LASTEvent])(XEvent *) = {
 205         [KeyPress] = kpress,
 206         [ConfigureNotify] = resize,
 207         [VisibilityNotify] = visibility,
 208         [UnmapNotify] = unmap,
 209         [Expose] = expose,
 210         [FocusIn] = focus,
 211         [FocusOut] = focus,
 212         [MotionNotify] = bmotion,
 213         [ButtonPress] = bpress,
 214         [ButtonRelease] = brelease,
 215 };
 216
 217 /* Globals */
 218 static DC dc;
 219 static XWindow xw;
 220 static Term term;
 221 static CSIEscape escseq;
 222 static int cmdfd;
 223 static pid_t pid;
 224 static Selection sel;
 225 static char *opt_cmd   = NULL;
 226 static char *opt_title = NULL;
 227
 228 void
 229 selinit(void) {
 230         sel.mode = 0;
 231         sel.bx = -1;
 232         sel.clip = NULL;
 233 }
 234
 235 static inline int selected(int x, int y) {
 236         if(sel.ey == y && sel.by == y) {
 237                 int bx = MIN(sel.bx, sel.ex);
 238                 int ex = MAX(sel.bx, sel.ex);
 239                 return BETWEEN(x, bx, ex);
 240         }
 241         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 242                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 243 }
 244
 245 static void getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 246         if(b) *b = e->xbutton.state,
 247                 *b=*b==4096?5:*b==2048?4:*b==1024?3:*b==512?2:*b==256?1:-1;
 248         *x = e->xbutton.x/xw.cw;
 249         *y = e->xbutton.y/xw.ch;
 250         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 251         sel.b.y = MIN(sel.by, sel.ey);
 252         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 253         sel.e.y = MAX(sel.by, sel.ey);
 254 }
 255
 256 static void bpress(XEvent *e) {
 257         sel.mode = 1;
 258         sel.ex = sel.bx = e->xbutton.x/xw.cw;
 259         sel.ey = sel.by = e->xbutton.y/xw.ch;
 260 }
 261
 262 static char *getseltext() {
 263         char *str, *ptr;
 264         int ls, x, y, sz;
 265         if(sel.bx == -1)
 266                 return NULL;
 267         sz = (term.col+1) * (sel.e.y-sel.b.y+1);
 268         ptr = str = malloc(sz);
 269         for(y = 0; y < term.row; y++) {
 270                 for(x = 0; x < term.col; x++)
 271                         if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y)))
 272                                 *ptr = term.line[y][x].c, ptr++;
 273                 if(ls)
 274                         *ptr = '\n', ptr++;
 275         }
 276         *ptr = 0;
 277         return str;
 278 }
 279
 280 /* TODO: use X11 clipboard */
 281 static void selcopy(char *str) {
 282         free(sel.clip);
 283         sel.clip = str;
 284 }
 285
 286 static void selpaste() {
 287         if(sel.clip)
 288                 ttywrite(sel.clip, strlen(sel.clip));
 289 }
 290
 291 /* TODO: doubleclick to select word */
 292 static void brelease(XEvent *e) {
 293         int b;
 294         sel.mode = 0;
 295         getbuttoninfo(e, &b, &sel.ex, &sel.ey);
 296         if(sel.bx==sel.ex && sel.by==sel.ey) {
 297                 sel.bx = -1;
 298                 if(b==2)
 299                         selpaste();
 300         } else {
 301                 if(b==1)
 302                         selcopy(getseltext());
 303         }
 304         draw(1);
 305 }
 306
 307 static void bmotion(XEvent *e) {
 308         if (sel.mode) {
 309                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 310                 draw(1);
 311         }
 312 }
 313
 314 #ifdef DEBUG
 315 void
 316 tdump(void) {
 317         int row, col;
 318         Glyph c;
 319
 320         for(row = 0; row < term.row; row++) {
 321                 for(col = 0; col < term.col; col++) {
 322                         if(col == term.c.x && row == term.c.y)
 323                                 putchar('#');
 324                         else {
 325                                 c = term.line[row][col];
 326                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 327                         }
 328                 }
 329                 putchar('\n');
 330         }
 331 }
 332 #endif
 333
 334 void
 335 die(const char *errstr, ...) {
 336         va_list ap;
 337
 338         va_start(ap, errstr);
 339         vfprintf(stderr, errstr, ap);
 340         va_end(ap);
 341         exit(EXIT_FAILURE);
 342 }
 343
 344 void
 345 execsh(void) {
 346         char *args[] = {getenv("SHELL"), "-i", NULL};
 347         if(opt_cmd)
 348                 args[0] = opt_cmd, args[1] = NULL;
 349         else
 350                 DEFAULT(args[0], SHELL);
 351         putenv("TERM="TNAME);
 352         execvp(args[0], args);
 353 }
 354
 355 void
 356 sigchld(int a) {
 357         int stat = 0;
 358         if(waitpid(pid, &stat, 0) < 0)
 359                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 360         if(WIFEXITED(stat))
 361                 exit(WEXITSTATUS(stat));
 362         else
 363                 exit(EXIT_FAILURE);
 364 }
 365
 366 void
 367 ttynew(void) {
 368         int m, s;
 369
 370         /* seems to work fine on linux, openbsd and freebsd */
 371         struct winsize w = {term.row, term.col, 0, 0};
 372         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 373                 die("openpty failed: %s\n", SERRNO);
 374
 375         switch(pid = fork()) {
 376         case -1:
 377                 die("fork failed\n");
 378                 break;
 379         case 0:
 380                 setsid(); /* create a new process group */
 381                 dup2(s, STDIN_FILENO);
 382                 dup2(s, STDOUT_FILENO);
 383                 dup2(s, STDERR_FILENO);
 384                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 385                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 386                 close(s);
 387                 close(m);
 388                 execsh();
 389                 break;
 390         default:
 391                 close(s);
 392                 cmdfd = m;
 393                 signal(SIGCHLD, sigchld);
 394         }
 395 }
 396
 397 void
 398 dump(char c) {
 399         static int col;
 400         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 401         if(++col % 10 == 0)
 402                 fprintf(stderr, "\n");
 403 }
 404
 405 void
 406 ttyread(void) {
 407         char buf[BUFSIZ];
 408         int ret;
 409
 410         if((ret = read(cmdfd, buf, LEN(buf))) < 0)
 411                 die("Couldn't read from shell: %s\n", SERRNO);
 412         else
 413                 tputs(buf, ret);
 414 }
 415
 416 void
 417 ttywrite(const char *s, size_t n) {
 418         if(write(cmdfd, s, n) == -1)
 419                 die("write error on tty: %s\n", SERRNO);
 420 }
 421
 422 void
 423 ttyresize(int x, int y) {
 424         struct winsize w;
 425
 426         w.ws_row = term.row;
 427         w.ws_col = term.col;
 428         w.ws_xpixel = w.ws_ypixel = 0;
 429         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 430                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 431 }
 432
 433 void
 434 tcursor(int mode) {
 435         static TCursor c;
 436
 437         if(mode == CURSOR_SAVE)
 438                 c = term.c;
 439         else if(mode == CURSOR_LOAD)
 440                 term.c = c, tmoveto(c.x, c.y);
 441 }
 442
 443 void
 444 treset(void) {
 445         term.c = (TCursor){{
 446                 .mode = ATTR_NULL,
 447                 .fg = DefaultFG,
 448                 .bg = DefaultBG
 449         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 450
 451         term.top = 0, term.bot = term.row - 1;
 452         term.mode = MODE_WRAP;
 453         tclearregion(0, 0, term.col-1, term.row-1);
 454 }
 455
 456 void
 457 tnew(int col, int row) {
 458         /* set screen size */
 459         term.row = row, term.col = col;
 460         term.line = malloc(term.row * sizeof(Line));
 461         term.alt  = malloc(term.row * sizeof(Line));
 462         for(row = 0 ; row < term.row; row++) {
 463                 term.line[row] = malloc(term.col * sizeof(Glyph));
 464                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 465         }
 466         /* setup screen */
 467         treset();
 468 }
 469
 470 void
 471 tswapscreen(void) {
 472         Line* tmp = term.line;
 473         term.line = term.alt;
 474         term.alt = tmp;
 475         term.mode ^= MODE_ALTSCREEN;
 476 }
 477
 478 void
 479 tscrolldown(int orig, int n) {
 480         int i;
 481         Line temp;
 482
 483         LIMIT(n, 0, term.bot-orig+1);
 484
 485         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 486
 487         for(i = term.bot; i >= orig+n; i--) {
 488                 temp = term.line[i];
 489                 term.line[i] = term.line[i-n];
 490                 term.line[i-n] = temp;
 491         }
 492 }
 493
 494 void
 495 tscrollup(int orig, int n) {
 496         int i;
 497         Line temp;
 498         LIMIT(n, 0, term.bot-orig+1);
 499
 500         tclearregion(0, orig, term.col-1, orig+n-1);
 501
 502         for(i = orig; i <= term.bot-n; i++) {
 503                  temp = term.line[i];
 504                  term.line[i] = term.line[i+n];
 505                  term.line[i+n] = temp;
 506         }
 507 }
 508
 509 void
 510 tnewline(void) {
 511         int y = term.c.y;
 512         if(term.c.y == term.bot)
 513                 tscrollup(term.top, 1);
 514         else
 515                 y++;
 516         tmoveto(0, y);
 517 }
 518
 519 void
 520 csiparse(void) {
 521         /* int noarg = 1; */
 522         char *p = escseq.buf;
 523
 524         escseq.narg = 0;
 525         if(*p == '?')
 526                 escseq.priv = 1, p++;
 527
 528         while(p < escseq.buf+escseq.len) {
 529                 while(isdigit(*p)) {
 530                         escseq.arg[escseq.narg] *= 10;
 531                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 532                 }
 533                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 534                         escseq.narg++, p++;
 535                 else {
 536                         escseq.mode = *p;
 537                         escseq.narg++;
 538                         return;
 539                 }
 540         }
 541 }
 542
 543 void
 544 tmoveto(int x, int y) {
 545         LIMIT(x, 0, term.col-1);
 546         LIMIT(y, 0, term.row-1);
 547         term.c.state &= ~CURSOR_WRAPNEXT;
 548         term.c.x = x;
 549         term.c.y = y;
 550 }
 551
 552 void
 553 tsetchar(char c) {
 554         term.line[term.c.y][term.c.x] = term.c.attr;
 555         term.line[term.c.y][term.c.x].c = c;
 556         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 557 }
 558
 559 void
 560 tclearregion(int x1, int y1, int x2, int y2) {
 561         int y, temp;
 562
 563         if(x1 > x2)
 564                 temp = x1, x1 = x2, x2 = temp;
 565         if(y1 > y2)
 566                 temp = y1, y1 = y2, y2 = temp;
 567
 568         LIMIT(x1, 0, term.col-1);
 569         LIMIT(x2, 0, term.col-1);
 570         LIMIT(y1, 0, term.row-1);
 571         LIMIT(y2, 0, term.row-1);
 572
 573         for(y = y1; y <= y2; y++)
 574                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 575 }
 576
 577 void
 578 tdeletechar(int n) {
 579         int src = term.c.x + n;
 580         int dst = term.c.x;
 581         int size = term.col - src;
 582
 583         if(src >= term.col) {
 584                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 585                 return;
 586         }
 587         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 588         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 589 }
 590
 591 void
 592 tinsertblank(int n) {
 593         int src = term.c.x;
 594         int dst = src + n;
 595         int size = term.col - dst;
 596
 597         if(dst >= term.col) {
 598                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 599                 return;
 600         }
 601         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 602         tclearregion(src, term.c.y, dst - 1, term.c.y);
 603 }
 604
 605 void
 606 tinsertblankline(int n) {
 607         if(term.c.y < term.top || term.c.y > term.bot)
 608                 return;
 609
 610         tscrolldown(term.c.y, n);
 611 }
 612
 613 void
 614 tdeleteline(int n) {
 615         if(term.c.y < term.top || term.c.y > term.bot)
 616                 return;
 617
 618         tscrollup(term.c.y, n);
 619 }
 620
 621 void
 622 tsetattr(int *attr, int l) {
 623         int i;
 624
 625         for(i = 0; i < l; i++) {
 626                 switch(attr[i]) {
 627                 case 0:
 628                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 629                         term.c.attr.fg = DefaultFG;
 630                         term.c.attr.bg = DefaultBG;
 631                         break;
 632                 case 1:
 633                         term.c.attr.mode |= ATTR_BOLD;
 634                         break;
 635                 case 4:
 636                         term.c.attr.mode |= ATTR_UNDERLINE;
 637                         break;
 638                 case 7:
 639                         term.c.attr.mode |= ATTR_REVERSE;
 640                         break;
 641                 case 22:
 642                         term.c.attr.mode &= ~ATTR_BOLD;
 643                         break;
 644                 case 24:
 645                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 646                         break;
 647                 case 27:
 648                         term.c.attr.mode &= ~ATTR_REVERSE;
 649                         break;
 650                 case 38:
 651                         if (i + 2 < l && attr[i + 1] == 5) {
 652                                 i += 2;
 653                                 if (BETWEEN(attr[i], 0, 255))
 654                                         term.c.attr.fg = attr[i];
 655                                 else
 656                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 657                         }
 658                         else
 659                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 660                         break;
 661                 case 39:
 662                         term.c.attr.fg = DefaultFG;
 663                         break;
 664                 case 48:
 665                         if (i + 2 < l && attr[i + 1] == 5) {
 666                                 i += 2;
 667                                 if (BETWEEN(attr[i], 0, 255))
 668                                         term.c.attr.bg = attr[i];
 669                                 else
 670                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 671                         }
 672                         else
 673                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 674                         break;
 675                 case 49:
 676                         term.c.attr.bg = DefaultBG;
 677                         break;
 678                 default:
 679                         if(BETWEEN(attr[i], 30, 37))
 680                                 term.c.attr.fg = attr[i] - 30;
 681                         else if(BETWEEN(attr[i], 40, 47))
 682                                 term.c.attr.bg = attr[i] - 40;
 683                         else if(BETWEEN(attr[i], 90, 97))
 684                                 term.c.attr.fg = attr[i] - 90 + 8;
 685                         else if(BETWEEN(attr[i], 100, 107))
 686                                 term.c.attr.fg = attr[i] - 100 + 8;
 687                         else
 688                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
 689
 690                         break;
 691                 }
 692         }
 693 }
 694
 695 void
 696 tsetscroll(int t, int b) {
 697         int temp;
 698
 699         LIMIT(t, 0, term.row-1);
 700         LIMIT(b, 0, term.row-1);
 701         if(t > b) {
 702                 temp = t;
 703                 t = b;
 704                 b = temp;
 705         }
 706         term.top = t;
 707         term.bot = b;
 708 }
 709
 710 void
 711 csihandle(void) {
 712         switch(escseq.mode) {
 713         default:
 714         unknown:
 715                 printf("erresc: unknown csi ");
 716                 csidump();
 717                 /* die(""); */
 718                 break;
 719         case '@': /* ICH -- Insert <n> blank char */
 720                 DEFAULT(escseq.arg[0], 1);
 721                 tinsertblank(escseq.arg[0]);
 722                 break;
 723         case 'A': /* CUU -- Cursor <n> Up */
 724         case 'e':
 725                 DEFAULT(escseq.arg[0], 1);
 726                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 727                 break;
 728         case 'B': /* CUD -- Cursor <n> Down */
 729                 DEFAULT(escseq.arg[0], 1);
 730                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 731                 break;
 732         case 'C': /* CUF -- Cursor <n> Forward */
 733         case 'a':
 734                 DEFAULT(escseq.arg[0], 1);
 735                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 736                 break;
 737         case 'D': /* CUB -- Cursor <n> Backward */
 738                 DEFAULT(escseq.arg[0], 1);
 739                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 740                 break;
 741         case 'E': /* CNL -- Cursor <n> Down and first col */
 742                 DEFAULT(escseq.arg[0], 1);
 743                 tmoveto(0, term.c.y+escseq.arg[0]);
 744                 break;
 745         case 'F': /* CPL -- Cursor <n> Up and first col */
 746                 DEFAULT(escseq.arg[0], 1);
 747                 tmoveto(0, term.c.y-escseq.arg[0]);
 748                 break;
 749         case 'G': /* CHA -- Move to <col> */
 750         case '`': /* XXX: HPA -- same? */
 751                 DEFAULT(escseq.arg[0], 1);
 752                 tmoveto(escseq.arg[0]-1, term.c.y);
 753                 break;
 754         case 'H': /* CUP -- Move to <row> <col> */
 755         case 'f': /* XXX: HVP -- same? */
 756                 DEFAULT(escseq.arg[0], 1);
 757                 DEFAULT(escseq.arg[1], 1);
 758                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 759                 break;
 760         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 761         case 'J': /* ED -- Clear screen */
 762                 switch(escseq.arg[0]) {
 763                 case 0: /* below */
 764                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 765                         break;
 766                 case 1: /* above */
 767                         tclearregion(0, 0, term.c.x, term.c.y);
 768                         break;
 769                 case 2: /* all */
 770                         tclearregion(0, 0, term.col-1, term.row-1);
 771                         break;
 772                 default:
 773                         goto unknown;
 774                 }
 775                 break;
 776         case 'K': /* EL -- Clear line */
 777                 switch(escseq.arg[0]) {
 778                 case 0: /* right */
 779                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 780                         break;
 781                 case 1: /* left */
 782                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 783                         break;
 784                 case 2: /* all */
 785                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 786                         break;
 787                 }
 788                 break;
 789         case 'S': /* SU -- Scroll <n> line up */
 790                 DEFAULT(escseq.arg[0], 1);
 791                 tscrollup(term.top, escseq.arg[0]);
 792                 break;
 793         case 'T': /* SD -- Scroll <n> line down */
 794                 DEFAULT(escseq.arg[0], 1);
 795                 tscrolldown(term.top, escseq.arg[0]);
 796                 break;
 797         case 'L': /* IL -- Insert <n> blank lines */
 798                 DEFAULT(escseq.arg[0], 1);
 799                 tinsertblankline(escseq.arg[0]);
 800                 break;
 801         case 'l': /* RM -- Reset Mode */
 802                 if(escseq.priv) {
 803                         switch(escseq.arg[0]) {
 804                         case 1:
 805                                 term.mode &= ~MODE_APPKEYPAD;
 806                                 break;
 807                         case 5: /* TODO: DECSCNM -- Remove reverse video */
 808                                 break;
 809                         case 7:
 810                                 term.mode &= ~MODE_WRAP;
 811                                 break;
 812                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 813                                 break;
 814                         case 25:
 815                                 term.c.state |= CURSOR_HIDE;
 816                                 break;
 817                         case 1049: /* = 1047 and 1048 */
 818                         case 1047:
 819                                 if(IS_SET(MODE_ALTSCREEN)) {
 820                                         tclearregion(0, 0, term.col-1, term.row-1);
 821                                         tswapscreen();
 822                                 }
 823                                 if(escseq.arg[0] == 1047)
 824                                         break;
 825                         case 1048:
 826                                 tcursor(CURSOR_LOAD);
 827                                 break;
 828                         default:
 829                                 goto unknown;
 830                         }
 831                 } else {
 832                         switch(escseq.arg[0]) {
 833                         case 4:
 834                                 term.mode &= ~MODE_INSERT;
 835                                 break;
 836                         default:
 837                                 goto unknown;
 838                         }
 839                 }
 840                 break;
 841         case 'M': /* DL -- Delete <n> lines */
 842                 DEFAULT(escseq.arg[0], 1);
 843                 tdeleteline(escseq.arg[0]);
 844                 break;
 845         case 'X': /* ECH -- Erase <n> char */
 846                 DEFAULT(escseq.arg[0], 1);
 847                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 848                 break;
 849         case 'P': /* DCH -- Delete <n> char */
 850                 DEFAULT(escseq.arg[0], 1);
 851                 tdeletechar(escseq.arg[0]);
 852                 break;
 853         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 854         case 'd': /* VPA -- Move to <row> */
 855                 DEFAULT(escseq.arg[0], 1);
 856                 tmoveto(term.c.x, escseq.arg[0]-1);
 857                 break;
 858         case 'h': /* SM -- Set terminal mode */
 859                 if(escseq.priv) {
 860                         switch(escseq.arg[0]) {
 861                         case 1:
 862                                 term.mode |= MODE_APPKEYPAD;
 863                                 break;
 864                         case 5: /* DECSCNM -- Reverve video */
 865                                 /* TODO: set REVERSE on the whole screen (f) */
 866                                 break;
 867                         case 7:
 868                                 term.mode |= MODE_WRAP;
 869                                 break;
 870                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 871                                  /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
 872                                 if(escseq.narg > 1 && escseq.arg[1] != 25)
 873                                         break;
 874                         case 25:
 875                                 term.c.state &= ~CURSOR_HIDE;
 876                                 break;
 877                         case 1049: /* = 1047 and 1048 */
 878                         case 1047:
 879                                 if(IS_SET(MODE_ALTSCREEN))
 880                                         tclearregion(0, 0, term.col-1, term.row-1);
 881                                 else
 882                                         tswapscreen();
 883                                 if(escseq.arg[0] == 1047)
 884                                         break;
 885                         case 1048:
 886                                 tcursor(CURSOR_SAVE);
 887                                 break;
 888                         default: goto unknown;
 889                         }
 890                 } else {
 891                         switch(escseq.arg[0]) {
 892                         case 4:
 893                                 term.mode |= MODE_INSERT;
 894                                 break;
 895                         default: goto unknown;
 896                         }
 897                 };
 898                 break;
 899         case 'm': /* SGR -- Terminal attribute (color) */
 900                 tsetattr(escseq.arg, escseq.narg);
 901                 break;
 902         case 'r': /* DECSTBM -- Set Scrolling Region */
 903                 if(escseq.priv)
 904                         goto unknown;
 905                 else {
 906                         DEFAULT(escseq.arg[0], 1);
 907                         DEFAULT(escseq.arg[1], term.row);
 908                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 909                         tmoveto(0, 0);
 910                 }
 911                 break;
 912         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 913                 tcursor(CURSOR_SAVE);
 914                 break;
 915         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 916                 tcursor(CURSOR_LOAD);
 917                 break;
 918         }
 919 }
 920
 921 void
 922 csidump(void) {
 923         int i;
 924         printf("ESC [ %s", escseq.priv ? "? " : "");
 925         if(escseq.narg)
 926                 for(i = 0; i < escseq.narg; i++)
 927                         printf("%d ", escseq.arg[i]);
 928         if(escseq.mode)
 929                 putchar(escseq.mode);
 930         putchar('\n');
 931 }
 932
 933 void
 934 csireset(void) {
 935         memset(&escseq, 0, sizeof(escseq));
 936 }
 937
 938 void
 939 tputtab(void) {
 940         int space = TAB - term.c.x % TAB;
 941         tmoveto(term.c.x + space, term.c.y);
 942 }
 943
 944 void
 945 tputc(char c) {
 946         if(term.esc & ESC_START) {
 947                 if(term.esc & ESC_CSI) {
 948                         escseq.buf[escseq.len++] = c;
 949                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 950                                 term.esc = 0;
 951                                 csiparse(), csihandle();
 952                         }
 953                         /* TODO: handle other OSC */
 954                 } else if(term.esc & ESC_OSC) {
 955                         if(c == ';') {
 956                                 term.titlelen = 0;
 957                                 term.esc = ESC_START | ESC_TITLE;
 958                         }
 959                 } else if(term.esc & ESC_TITLE) {
 960                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 961                                 term.esc = 0;
 962                                 term.title[term.titlelen] = '\0';
 963                                 XStoreName(xw.dis, xw.win, term.title);
 964                         } else {
 965                                 term.title[term.titlelen++] = c;
 966                         }
 967                 } else if(term.esc & ESC_ALTCHARSET) {
 968                         switch(c) {
 969                         case '0': /* Line drawing crap */
 970                                 term.c.attr.mode |= ATTR_GFX;
 971                                 break;
 972                         case 'B': /* Back to regular text */
 973                                 term.c.attr.mode &= ~ATTR_GFX;
 974                                 break;
 975                         default:
 976                                 printf("esc unhandled charset: ESC ( %c\n", c);
 977                         }
 978                         term.esc = 0;
 979                 } else {
 980                         switch(c) {
 981                         case '[':
 982                                 term.esc |= ESC_CSI;
 983                                 break;
 984                         case ']':
 985                                 term.esc |= ESC_OSC;
 986                                 break;
 987                         case '(':
 988                                 term.esc |= ESC_ALTCHARSET;
 989                                 break;
 990                         case 'D': /* IND -- Linefeed */
 991                                 if(term.c.y == term.bot)
 992                                         tscrollup(term.top, 1);
 993                                 else
 994                                         tmoveto(term.c.x, term.c.y+1);
 995                                 term.esc = 0;
 996                                 break;
 997                         case 'E': /* NEL -- Next line */
 998                                 tnewline();
 999                                 term.esc = 0;
1000                                 break;
1001                         case 'M': /* RI -- Reverse index */
1002                                 if(term.c.y == term.top)
1003                                         tscrolldown(term.top, 1);
1004                                 else
1005                                         tmoveto(term.c.x, term.c.y-1);
1006                                 term.esc = 0;
1007                                 break;
1008                         case 'c': /* RIS -- Reset to inital state */
1009                                 treset();
1010                                 term.esc = 0;
1011                                 break;
1012                         case '=': /* DECPAM -- Application keypad */
1013                                 term.mode |= MODE_APPKEYPAD;
1014                                 term.esc = 0;
1015                                 break;
1016                         case '>': /* DECPNM -- Normal keypad */
1017                                 term.mode &= ~MODE_APPKEYPAD;
1018                                 term.esc = 0;
1019                                 break;
1020                         case '7': /* DECSC -- Save Cursor */
1021                                 tcursor(CURSOR_SAVE);
1022                                 term.esc = 0;
1023                                 break;
1024                         case '8': /* DECRC -- Restore Cursor */
1025                                 tcursor(CURSOR_LOAD);
1026                                 term.esc = 0;
1027                                 break;
1028                         default:
1029                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
1030                                 term.esc = 0;
1031                         }
1032                 }
1033         } else {
1034                 switch(c) {
1035                 case '\t':
1036                         tputtab();
1037                         break;
1038                 case '\b':
1039                         tmoveto(term.c.x-1, term.c.y);
1040                         break;
1041                 case '\r':
1042                         tmoveto(0, term.c.y);
1043                         break;
1044                 case '\n':
1045                         tnewline();
1046                         break;
1047                 case '\a':
1048                         if(!xw.focus)
1049                                 xseturgency(1);
1050                         break;
1051                 case '\033':
1052                         csireset();
1053                         term.esc = ESC_START;
1054                         break;
1055                 default:
1056                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1057                                 tnewline();
1058                         tsetchar(c);
1059                         if(term.c.x+1 < term.col)
1060                                 tmoveto(term.c.x+1, term.c.y);
1061                         else
1062                                 term.c.state |= CURSOR_WRAPNEXT;
1063                         break;
1064                 }
1065         }
1066 }
1067
1068 void
1069 tputs(char *s, int len) {
1070         for(; len > 0; len--)
1071                 tputc(*s++);
1072 }
1073
1074 void
1075 tresize(int col, int row) {
1076         int i;
1077         int minrow = MIN(row, term.row);
1078         int mincol = MIN(col, term.col);
1079         int slide = term.c.y - row + 1;
1080
1081         if(col < 1 || row < 1)
1082                 return;
1083
1084         /* free unneeded rows */
1085         i = 0;
1086         if(slide > 0) {
1087                 /* slide screen to keep cursor where we expect it -
1088                  * tscrollup would work here, but we can optimize to
1089                  * memmove because we're freeing the earlier lines */
1090                 for(/* i = 0 */; i < slide; i++) {
1091                         free(term.line[i]);
1092                         free(term.alt[i]);
1093                 }
1094                 memmove(term.line, term.line + slide, row * sizeof(Line));
1095                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1096         }
1097         for(i += row; i < term.row; i++) {
1098                 free(term.line[i]);
1099                 free(term.alt[i]);
1100         }
1101
1102         /* resize to new height */
1103         term.line = realloc(term.line, row * sizeof(Line));
1104         term.alt  = realloc(term.alt,  row * sizeof(Line));
1105
1106         /* resize each row to new width, zero-pad if needed */
1107         for(i = 0; i < minrow; i++) {
1108                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1109                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1110                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1111                 memset(term.alt[i]  + mincol, 0, (col - mincol) * sizeof(Glyph));
1112         }
1113
1114         /* allocate any new rows */
1115         for(/* i == minrow */; i < row; i++) {
1116                 term.line[i] = calloc(col, sizeof(Glyph));
1117                 term.alt [i] = calloc(col, sizeof(Glyph));
1118         }
1119
1120         /* update terminal size */
1121         term.col = col, term.row = row;
1122         /* make use of the LIMIT in tmoveto */
1123         tmoveto(term.c.x, term.c.y);
1124         /* reset scrolling region */
1125         tsetscroll(0, row-1);
1126 }
1127
1128 void
1129 xloadcols(void) {
1130         int i, r, g, b;
1131         XColor color;
1132         unsigned long white = WhitePixel(xw.dis, xw.scr);
1133
1134         for(i = 0; i < 16; i++) {
1135                 if (!XAllocNamedColor(xw.dis, xw.cmap, colorname[i], &color, &color)) {
1136                         dc.col[i] = white;
1137                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1138                 } else
1139                         dc.col[i] = color.pixel;
1140         }
1141
1142         /* same colors as xterm */
1143         for(r = 0; r < 6; r++)
1144                 for(g = 0; g < 6; g++)
1145                         for(b = 0; b < 6; b++) {
1146                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1147                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1148                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1149                                 if (!XAllocColor(xw.dis, xw.cmap, &color)) {
1150                                         dc.col[i] = white;
1151                                         fprintf(stderr, "Could not allocate color %d\n", i);
1152                                 } else
1153                                         dc.col[i] = color.pixel;
1154                                 i++;
1155                         }
1156
1157         for(r = 0; r < 24; r++, i++) {
1158                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1159                 if (!XAllocColor(xw.dis, xw.cmap, &color)) {
1160                         dc.col[i] = white;
1161                         fprintf(stderr, "Could not allocate color %d\n", i);
1162                 } else
1163                         dc.col[i] = color.pixel;
1164         }
1165 }
1166
1167 void
1168 xclear(int x1, int y1, int x2, int y2) {
1169         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1170         XFillRectangle(xw.dis, xw.buf, dc.gc,
1171                        x1 * xw.cw, y1 * xw.ch,
1172                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1173 }
1174
1175 void
1176 xhints(void)
1177 {
1178         XClassHint class = {TNAME, TNAME};
1179         XWMHints wm = {.flags = InputHint, .input = 1};
1180         XSizeHints size = {
1181                 .flags = PSize | PResizeInc | PBaseSize,
1182                 .height = xw.h,
1183                 .width = xw.w,
1184                 .height_inc = xw.ch,
1185                 .width_inc = xw.cw,
1186                 .base_height = 2*BORDER,
1187                 .base_width = 2*BORDER,
1188         };
1189         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1190 }
1191
1192 void
1193 xinit(void) {
1194         XSetWindowAttributes attrs;
1195
1196         if(!(xw.dis = XOpenDisplay(NULL)))
1197                 die("Can't open display\n");
1198         xw.scr = XDefaultScreen(xw.dis);
1199
1200         /* font */
1201         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1202                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1203
1204         /* XXX: Assuming same size for bold font */
1205         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1206         xw.ch = dc.font->ascent + dc.font->descent;
1207
1208         /* colors */
1209         xw.cmap = XDefaultColormap(xw.dis, xw.scr);
1210         xloadcols();
1211
1212         /* window - default size */
1213         xw.bufh = 24 * xw.ch;
1214         xw.bufw = 80 * xw.cw;
1215         xw.h = xw.bufh + 2*BORDER;
1216         xw.w = xw.bufw + 2*BORDER;
1217
1218         attrs.background_pixel = dc.col[DefaultBG];
1219         attrs.border_pixel = dc.col[DefaultBG];
1220         attrs.bit_gravity = NorthWestGravity;
1221         attrs.event_mask = FocusChangeMask | KeyPressMask
1222                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1223                 | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
1224         attrs.colormap = xw.cmap;
1225
1226         xw.win = XCreateWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1227                         xw.w, xw.h, 0, XDefaultDepth(xw.dis, xw.scr), InputOutput,
1228                         XDefaultVisual(xw.dis, xw.scr),
1229                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1230                         | CWColormap,
1231                         &attrs);
1232         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1233
1234
1235         /* input methods */
1236         xw.xim = XOpenIM(xw.dis, NULL, NULL, NULL);
1237         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1238                                            | XIMStatusNothing, XNClientWindow, xw.win,
1239                                            XNFocusWindow, xw.win, NULL);
1240         /* gc */
1241         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1242
1243         XMapWindow(xw.dis, xw.win);
1244         xhints();
1245         XStoreName(xw.dis, xw.win, opt_title ? opt_title : "st");
1246         XSync(xw.dis, 0);
1247 }
1248
1249 void
1250 xdraws(char *s, Glyph base, int x, int y, int len) {
1251         unsigned long xfg, xbg;
1252         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1253         int i;
1254
1255         if(base.mode & ATTR_REVERSE)
1256                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1257         else
1258                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1259
1260         XSetBackground(xw.dis, dc.gc, xbg);
1261         XSetForeground(xw.dis, dc.gc, xfg);
1262
1263         if(base.mode & ATTR_GFX)
1264                 for(i = 0; i < len; i++) {
1265                         char c = gfx[(unsigned int)s[i] % 256];
1266                         if(c)
1267                                 s[i] = c;
1268                         else if(s[i] > 0x5f)
1269                                 s[i] -= 0x5f;
1270                 }
1271
1272         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1273         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1274
1275         if(base.mode & ATTR_UNDERLINE)
1276                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1277 }
1278
1279 void
1280 xdrawcursor(void) {
1281         static int oldx = 0;
1282         static int oldy = 0;
1283         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1284
1285         LIMIT(oldx, 0, term.col-1);
1286         LIMIT(oldy, 0, term.row-1);
1287
1288         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1289                 g.c = term.line[term.c.y][term.c.x].c;
1290
1291         /* remove the old cursor */
1292         if(term.line[oldy][oldx].state & GLYPH_SET)
1293                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1294         else
1295                 xclear(oldx, oldy, oldx, oldy);
1296
1297         /* draw the new one */
1298         if(!(term.c.state & CURSOR_HIDE) && xw.focus) {
1299                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1300                 oldx = term.c.x, oldy = term.c.y;
1301         }
1302 }
1303
1304 #ifdef DEBUG
1305 /* basic drawing routines */
1306 void
1307 xdrawc(int x, int y, Glyph g) {
1308         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1309         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1310         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1311         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1312         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1313 }
1314
1315 void
1316 draw(int dummy) {
1317         int x, y;
1318
1319         xclear(0, 0, term.col-1, term.row-1);
1320         for(y = 0; y < term.row; y++)
1321                 for(x = 0; x < term.col; x++)
1322                         if(term.line[y][x].state & GLYPH_SET)
1323                                 xdrawc(x, y, term.line[y][x]);
1324
1325         xdrawcursor();
1326         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1327         XFlush(xw.dis);
1328 }
1329
1330 #else
1331 /* optimized drawing routine */
1332 void
1333 draw(int redraw_all) {
1334         int i, x, y, ox;
1335         Glyph base, new;
1336         char buf[DRAW_BUF_SIZ];
1337
1338         if(!xw.vis)
1339                 return;
1340
1341         xclear(0, 0, term.col-1, term.row-1);
1342         for(y = 0; y < term.row; y++) {
1343                 base = term.line[y][0];
1344                 i = ox = 0;
1345                 for(x = 0; x < term.col; x++) {
1346                         new = term.line[y][x];
1347                         if(sel.bx!=-1 && new.c && selected(x, y))
1348                                 new.mode ^= ATTR_REVERSE;
1349                         if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1350                                         i >= DRAW_BUF_SIZ)) {
1351                                 xdraws(buf, base, ox, y, i);
1352                                 i = 0;
1353                         }
1354                         if(new.state & GLYPH_SET) {
1355                                 if(i == 0) {
1356                                         ox = x;
1357                                         base = new;
1358                                 }
1359                                 buf[i++] = new.c;
1360                         }
1361                 }
1362                 if(i > 0)
1363                         xdraws(buf, base, ox, y, i);
1364         }
1365         xdrawcursor();
1366         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1367         XFlush(xw.dis);
1368 }
1369
1370 #endif
1371
1372 void
1373 expose(XEvent *ev) {
1374         draw(SCREEN_REDRAW);
1375 }
1376
1377 void
1378 visibility(XEvent *ev) {
1379         XVisibilityEvent *e = &ev->xvisibility;
1380         /* XXX if this goes from 0 to 1, need a full redraw for next Expose,
1381          * not just a buf copy */
1382         xw.vis = e->state != VisibilityFullyObscured;
1383 }
1384
1385 void
1386 unmap(XEvent *ev) {
1387         xw.vis = 0;
1388 }
1389
1390 void
1391 xseturgency(int add) {
1392         XWMHints *h = XGetWMHints(xw.dis, xw.win);
1393         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1394         XSetWMHints(xw.dis, xw.win, h);
1395         XFree(h);
1396 }
1397
1398 void
1399 focus(XEvent *ev) {
1400         if((xw.focus = ev->type == FocusIn))
1401                 xseturgency(0);
1402         draw(SCREEN_UPDATE);
1403 }
1404
1405 char*
1406 kmap(KeySym k) {
1407         int i;
1408         for(i = 0; i < LEN(key); i++)
1409                 if(key[i].k == k)
1410                         return (char*)key[i].s;
1411         return NULL;
1412 }
1413
1414 void
1415 kpress(XEvent *ev) {
1416         XKeyEvent *e = &ev->xkey;
1417         KeySym ksym;
1418         char buf[32];
1419         char *customkey;
1420         int len;
1421         int meta;
1422         int shift;
1423         Status status;
1424
1425         meta = e->state & Mod1Mask;
1426         shift = e->state & ShiftMask;
1427         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1428
1429         if((customkey = kmap(ksym)))
1430                 ttywrite(customkey, strlen(customkey));
1431         else if(len > 0) {
1432                 buf[sizeof(buf)-1] = '\0';
1433                 if(meta && len == 1)
1434                         ttywrite("\033", 1);
1435                 ttywrite(buf, len);
1436         } else
1437                 switch(ksym) {
1438                 case XK_Up:
1439                 case XK_Down:
1440                 case XK_Left:
1441                 case XK_Right:
1442                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1443                         ttywrite(buf, 3);
1444                         break;
1445                 case XK_Insert:
1446                         if(shift)
1447                                 selpaste(), draw(1);
1448                         break;
1449                 default:
1450                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1451                         break;
1452                 }
1453 }
1454
1455 void
1456 resize(XEvent *e) {
1457         int col, row;
1458
1459         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1460                 return;
1461
1462         xw.w = e->xconfigure.width;
1463         xw.h = e->xconfigure.height;
1464         xw.bufw = xw.w - 2*BORDER;
1465         xw.bufh = xw.h - 2*BORDER;
1466         col = xw.bufw / xw.cw;
1467         row = xw.bufh / xw.ch;
1468         tresize(col, row);
1469         ttyresize(col, row);
1470         xw.bufh = MAX(1, xw.bufh);
1471         xw.bufw = MAX(1, xw.bufw);
1472         XFreePixmap(xw.dis, xw.buf);
1473         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1474 }
1475
1476 void
1477 run(void) {
1478         XEvent ev;
1479         fd_set rfd;
1480         int xfd = XConnectionNumber(xw.dis);
1481
1482         for(;;) {
1483                 FD_ZERO(&rfd);
1484                 FD_SET(cmdfd, &rfd);
1485                 FD_SET(xfd, &rfd);
1486                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1487                         if(errno == EINTR)
1488                                 continue;
1489                         die("select failed: %s\n", SERRNO);
1490                 }
1491                 if(FD_ISSET(cmdfd, &rfd)) {
1492                         ttyread();
1493                         draw(SCREEN_UPDATE);
1494                 }
1495                 while(XPending(xw.dis)) {
1496                         XNextEvent(xw.dis, &ev);
1497                         if (XFilterEvent(&ev, xw.win))
1498                                 continue;
1499                         if(handler[ev.type])
1500                                 (handler[ev.type])(&ev);
1501                 }
1502         }
1503 }
1504
1505 int
1506 main(int argc, char *argv[]) {
1507         int i;
1508
1509         for(i = 1; i < argc; i++) {
1510                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1511                 case 't':
1512                         if(++i < argc) opt_title = argv[i];
1513                         break;
1514                 case 'e':
1515                         if(++i < argc) opt_cmd = argv[i];
1516                         break;
1517                 case 'v':
1518                 default:
1519                         die(USAGE);
1520                 }
1521         }
1522         setlocale(LC_CTYPE, "");
1523         tnew(80, 24);
1524         ttynew();
1525         xinit();
1526         selinit();
1527         run();
1528         return 0;
1529 }