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