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