st.c

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