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 #define TNAME "xterm"
  24
  25 /* Arbitrary sizes */
  26 #define TITLESIZ 256
  27 #define ESCSIZ 256
  28 #define ESCARGSIZ 16
  29 #define MAXDRAWBUF 1024
  30
  31 #define SERRNO strerror(errno)
  32 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  33 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  34 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  35 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  36 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  37 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  38 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  39
  40 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  41 enum { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4, ATgfx=8 };
  42 enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSsave, CSload };
  43 enum { CRset=1, CRupdate=2 };
  44 enum { TMwrap=1, TMinsert=2 };
  45 enum { ESCin=1, ESCcsi=2, ESCosc=4, ESCtitle=8, ESCcharset=16 };
  46 enum { SCupdate, SCredraw };
  47
  48 typedef int Color;
  49
  50 typedef struct {
  51         char c;     /* character code  */
  52         char mode;  /* attribute flags */
  53         Color fg;   /* foreground      */
  54         Color bg;   /* background      */
  55         char state; /* state flag      */
  56 } Glyph;
  57
  58 typedef Glyph* Line;
  59
  60 typedef struct {
  61         Glyph attr;  /* current char attributes */
  62         char hidden;
  63         int x;
  64         int y;
  65 } TCursor;
  66
  67 /* CSI Escape sequence structs */
  68 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  69 typedef struct {
  70         char buf[ESCSIZ]; /* raw string */
  71         int len;          /* raw string length */
  72         char priv;
  73         int arg[ESCARGSIZ];
  74         int narg;           /* nb of args */
  75         char mode;
  76 } CSIEscape;
  77
  78 /* Internal representation of the screen */
  79 typedef struct {
  80         int row;    /* nb row */
  81         int col;    /* nb col */
  82         Line* line; /* screen */
  83         TCursor c;  /* cursor */
  84         int top;    /* top    scroll limit */
  85         int bot;    /* bottom scroll limit */
  86         int mode;   /* terminal mode */
  87         int esc;
  88         char title[TITLESIZ];
  89         int titlelen;
  90 } Term;
  91
  92 /* Purely graphic info */
  93 typedef struct {
  94         Display* dis;
  95         Window win;
  96         int scr;
  97         int w;  /* window width  */
  98         int h;  /* window height */
  99         int ch; /* char height */
 100         int cw; /* char width  */
 101 } XWindow;
 102
 103 typedef struct {
 104         KeySym k;
 105         char s[ESCSIZ];
 106 } Key;
 107
 108 #include "config.h"
 109
 110 /* Drawing Context */
 111 typedef struct {
 112         unsigned long col[LEN(colorname)];
 113         XFontStruct* font;
 114         GC gc;
 115 } DC;
 116
 117 static void die(const char *errstr, ...);
 118 static void draw(int);
 119 static void execsh(void);
 120 static void sigchld(int);
 121 static void run(void);
 122
 123 static void csidump(void);
 124 static void csihandle(void);
 125 static void csiparse(void);
 126 static void csireset(void);
 127
 128 static void tclearregion(int, int, int, int);
 129 static void tcpos(int);
 130 static void tcursor(int);
 131 static void tdeletechar(int);
 132 static void tdeleteline(int);
 133 static void tinsertblank(int);
 134 static void tinsertblankline(int);
 135 static void tmoveto(int, int);
 136 static void tnew(int, int);
 137 static void tnewline(void);
 138 static void tputc(char);
 139 static void tputs(char*, int);
 140 static void tresize(int, int);
 141 static void tscroll(void);
 142 static void tsetattr(int*, int);
 143 static void tsetchar(char);
 144 static void tsetscroll(int, int);
 145
 146 static void ttynew(void);
 147 static void ttyread(void);
 148 static void ttyresize(int, int);
 149 static void ttywrite(const char *, size_t);
 150
 151 static unsigned long xgetcol(const char *);
 152 static void xclear(int, int, int, int);
 153 static void xcursor(int);
 154 static void xdrawc(int, int, Glyph);
 155 static void xinit(void);
 156 static void xscroll(void);
 157
 158 static void expose(XEvent *);
 159 static char * kmap(KeySym);
 160 static void kpress(XEvent *);
 161 static void resize(XEvent *);
 162
 163 static void (*handler[LASTEvent])(XEvent *) = {
 164         [KeyPress] = kpress,
 165         [Expose] = expose,
 166         [ConfigureNotify] = resize
 167 };
 168
 169 /* Globals */
 170 static DC dc;
 171 static XWindow xw;
 172 static Term term;
 173 static CSIEscape escseq;
 174 static int cmdfd;
 175 static pid_t pid;
 176 static int running;
 177
 178 #ifdef DEBUG
 179 void
 180 tdump(void) {
 181         int row, col;
 182         Glyph c;
 183
 184         for(row = 0; row < term.row; row++) {
 185                 for(col = 0; col < term.col; col++) {
 186                         if(col == term.c.x && row == term.c.y)
 187                                 putchar('#');
 188                         else {
 189                                 c = term.line[row][col];
 190                                 putchar(c.state & CRset ? c.c : '.');
 191                         }
 192                 }
 193                 putchar('\n');
 194         }
 195 }
 196 #endif
 197
 198 void
 199 die(const char *errstr, ...) {
 200         va_list ap;
 201
 202         va_start(ap, errstr);
 203         vfprintf(stderr, errstr, ap);
 204         va_end(ap);
 205         exit(EXIT_FAILURE);
 206 }
 207
 208 void
 209 execsh(void) {
 210         char *args[3] = {SHELL, "-i", NULL};
 211         putenv("TERM=" TNAME);
 212         execvp(SHELL, args);
 213 }
 214
 215 void
 216 xbell(void) { /* visual bell */
 217         XRectangle r = { 0, 0, xw.w, xw.h };
 218         XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
 219         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 220         /* usleep(30000); */
 221         draw(SCredraw);
 222 }
 223
 224 void
 225 sigchld(int a) {
 226         int stat = 0;
 227         if(waitpid(pid, &stat, 0) < 0)
 228                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 229         if(WIFEXITED(stat))
 230                 exit(WEXITSTATUS(stat));
 231         else
 232                 exit(EXIT_FAILURE);
 233 }
 234
 235 void
 236 ttynew(void) {
 237         int m, s;
 238         char *pts;
 239
 240         if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
 241                 die("openpt failed: %s\n", SERRNO);
 242         if(grantpt(m) < 0)
 243                 die("grandpt failed: %s\n", SERRNO);
 244         if(unlockpt(m) < 0)
 245                 die("unlockpt failed: %s\n", SERRNO);
 246         if(!(pts = ptsname(m)))
 247                 die("ptsname failed: %s\n", SERRNO);
 248         if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
 249                 die("Couldn't open slave: %s\n", SERRNO);
 250         fcntl(s, F_SETFL, O_NDELAY);
 251         switch(pid = fork()) {
 252         case -1:
 253                 die("fork failed\n");
 254                 break;
 255         case 0:
 256                 setsid(); /* create a new process group */
 257                 dup2(s, STDIN_FILENO);
 258                 dup2(s, STDOUT_FILENO);
 259                 dup2(s, STDERR_FILENO);
 260                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 261                         die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
 262                 execsh();
 263                 break;
 264         default:
 265                 close(s);
 266                 cmdfd = m;
 267                 signal(SIGCHLD, sigchld);
 268         }
 269 }
 270
 271 void
 272 dump(char c) {
 273         static int col;
 274         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 275         if(++col % 10 == 0)
 276                 fprintf(stderr, "\n");
 277 }
 278
 279 void
 280 ttyread(void) {
 281         char buf[BUFSIZ] = {0};
 282         int ret;
 283
 284         switch(ret = read(cmdfd, buf, BUFSIZ)) {
 285         case -1:
 286                 die("Couldn't read from shell: %s\n", SERRNO);
 287                 break;
 288         default:
 289                 tputs(buf, ret);
 290         }
 291 }
 292
 293 void
 294 ttywrite(const char *s, size_t n) {
 295         if(write(cmdfd, s, n) == -1)
 296                 die("write error on tty: %s\n", SERRNO);
 297 }
 298
 299 void
 300 ttyresize(int x, int y) {
 301         struct winsize w;
 302
 303         w.ws_row = term.row;
 304         w.ws_col = term.col;
 305         w.ws_xpixel = w.ws_ypixel = 0;
 306         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 307                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 308 }
 309
 310 void
 311 tcpos(int mode) {
 312         static int x = 0;
 313         static int y = 0;
 314
 315         if(mode == CSsave)
 316                 x = term.c.x, y = term.c.y;
 317         else if(mode == CSload)
 318                 tmoveto(x, y);
 319 }
 320
 321 void
 322 tnew(int col, int row) {   /* screen size */
 323         term.row = row, term.col = col;
 324         term.top = 0, term.bot = term.row - 1;
 325         /* mode */
 326         term.mode = TMwrap;
 327         /* cursor */
 328         term.c.attr.mode = ATnone;
 329         term.c.attr.fg = DefaultFG;
 330         term.c.attr.bg = DefaultBG;
 331         term.c.x = term.c.y = 0;
 332         term.c.hidden = 0;
 333         /* allocate screen */
 334         term.line = calloc(term.row, sizeof(Line));
 335         for(row = 0 ; row < term.row; row++)
 336                 term.line[row] = calloc(term.col, sizeof(Glyph));
 337 }
 338
 339 void
 340 tscroll(void) {
 341         Line temp = term.line[term.top];
 342         int i;
 343         /* X stuff _before_ the line swapping (results in wrong line index) */
 344         xscroll();
 345         for(i = term.top; i < term.bot; i++)
 346                 term.line[i] = term.line[i+1];
 347         memset(temp, 0, sizeof(Glyph) * term.col);
 348         term.line[term.bot] = temp;
 349 }
 350
 351 void
 352 tnewline(void) {
 353         int y = term.c.y + 1;
 354         if(y > term.bot)
 355                 tscroll(), y = term.bot;
 356         tmoveto(0, y);
 357 }
 358
 359 void
 360 csiparse(void) {
 361         /* int noarg = 1; */
 362         char *p = escseq.buf;
 363
 364         escseq.narg = 0;
 365         if(*p == '?')
 366                 escseq.priv = 1, p++;
 367
 368         while(p < escseq.buf+escseq.len) {
 369                 while(isdigit(*p)) {
 370                         escseq.arg[escseq.narg] *= 10;
 371                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 372                 }
 373                 if(*p == ';' && escseq.narg+1 < ESCARGSIZ)
 374                         escseq.narg++, p++;
 375                 else {
 376                         escseq.mode = *p;
 377                         escseq.narg++;
 378                         return;
 379                 }
 380         }
 381 }
 382
 383 void
 384 tmoveto(int x, int y) {
 385         term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
 386         term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
 387 }
 388
 389 void
 390 tcursor(int dir) {
 391         int xf = term.c.x, yf = term.c.y;
 392
 393         switch(dir) {
 394         case CSup:
 395                 yf--;
 396                 break;
 397         case CSdown:
 398                 yf++;
 399                 break;
 400         case CSleft:
 401                 xf--;
 402                 if(term.mode & TMwrap && xf < 0) {
 403                         xf = term.col-1, yf--;
 404                         if(yf < term.top)
 405                                 yf = term.top, xf = 0;
 406                 }
 407                 break;
 408         case CSright:
 409                 xf++;
 410                 if(term.mode & TMwrap && xf >= term.col) {
 411                         xf = 0, yf++;
 412                         if(yf > term.bot)
 413                                 yf = term.bot, tscroll();
 414                 }
 415                 break;
 416         }
 417         tmoveto(xf, yf);
 418 }
 419
 420 void
 421 tsetchar(char c) {
 422         term.line[term.c.y][term.c.x] = term.c.attr;
 423         term.line[term.c.y][term.c.x].c = c;
 424         term.line[term.c.y][term.c.x].state |= CRset | CRupdate;
 425 }
 426
 427 void
 428 tclearregion(int x1, int y1, int x2, int y2) {
 429         int x, y;
 430
 431         LIMIT(x1, 0, term.col-1);
 432         LIMIT(x2, 0, term.col-1);
 433         LIMIT(y1, 0, term.row-1);
 434         LIMIT(y2, 0, term.row-1);
 435
 436         /* XXX: could be optimized */
 437         for(x = x1; x <= x2; x++)
 438                 for(y = y1; y <= y2; y++)
 439                         memset(&term.line[y][x], 0, sizeof(Glyph));
 440
 441         xclear(x1, y1, x2, y2);
 442 }
 443
 444 void
 445 tdeletechar(int n) {
 446         int src = term.c.x + n;
 447         int dst = term.c.x;
 448         int size = term.col - src;
 449
 450         if(src >= term.col) {
 451                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 452                 return;
 453         }
 454         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 455         tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
 456 }
 457
 458 void
 459 tinsertblank(int n) {
 460         int src = term.c.x;
 461         int dst = src + n;
 462         int size = term.col - n - src;
 463
 464         if(dst >= term.col) {
 465                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 466                 return;
 467         }
 468         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 469         tclearregion(src, term.c.y, dst, term.c.y);
 470 }
 471
 472 void
 473 tsetlinestate(int n, int state) {
 474         int i;
 475         for(i = 0; i < term.col; i++)
 476                 term.line[n][i].state |= state;
 477 }
 478
 479 void
 480 tinsertblankline (int n) {
 481         int i;
 482         Line blank;
 483         int bot = term.bot;
 484
 485         if(term.c.y > term.bot)
 486                 bot = term.row - 1;
 487         else if(term.c.y < term.top)
 488                 bot = term.top - 1;
 489         if(term.c.y + n >= bot) {
 490                 tclearregion(0, term.c.y, term.col-1, bot);
 491                 return;
 492         }
 493         for(i = bot; i >= term.c.y+n; i--) {
 494                 /* swap deleted line <-> blanked line */
 495                 blank = term.line[i];
 496                 term.line[i] = term.line[i-n];
 497                 term.line[i-n] = blank;
 498                 /* blank it */
 499                 memset(blank, 0, term.col * sizeof(Glyph));
 500                 tsetlinestate(i, CRupdate);
 501                 tsetlinestate(i-n, CRupdate);
 502         }
 503 }
 504
 505 void
 506 tdeleteline(int n) {
 507         int i;
 508         Line blank;
 509         int bot = term.bot;
 510
 511         if(term.c.y > term.bot)
 512                 bot = term.row - 1;
 513         else if(term.c.y < term.top)
 514                 bot = term.top - 1;
 515         if(term.c.y + n >= bot) {
 516                 tclearregion(0, term.c.y, term.col-1, bot);
 517                 return;
 518         }
 519         for(i = term.c.y; i <= bot-n; i++) {
 520                 /* swap deleted line <-> blanked line */
 521                 blank = term.line[i];
 522                 term.line[i] = term.line[i+n];
 523                 term.line[i+n] = blank;
 524                 /* blank it */
 525                 memset(blank, 0, term.col * sizeof(Glyph));
 526                 tsetlinestate(i, CRupdate);
 527                 tsetlinestate(i-n, CRupdate);
 528         }
 529 }
 530
 531 void
 532 tsetattr(int *attr, int l) {
 533         int i;
 534
 535         for(i = 0; i < l; i++) {
 536                 switch(attr[i]) {
 537                 case 0:
 538                         term.c.attr.mode &= ~(ATreverse | ATunderline | ATbold);
 539                         term.c.attr.fg = DefaultFG;
 540                         term.c.attr.bg = DefaultBG;
 541                         break;
 542                 case 1:
 543                         term.c.attr.mode |= ATbold;
 544                         break;
 545                 case 4:
 546                         term.c.attr.mode |= ATunderline;
 547                         break;
 548                 case 7:
 549                         term.c.attr.mode |= ATreverse;
 550                         break;
 551                 case 8:
 552                         term.c.hidden = CShide;
 553                         break;
 554                 case 22:
 555                         term.c.attr.mode &= ~ATbold;
 556                         break;
 557                 case 24:
 558                         term.c.attr.mode &= ~ATunderline;
 559                         break;
 560                 case 27:
 561                         term.c.attr.mode &= ~ATreverse;
 562                         break;
 563                 case 39:
 564                         term.c.attr.fg = DefaultFG;
 565                         break;
 566                 case 49:
 567                         term.c.attr.fg = DefaultBG;
 568                         break;
 569                 default:
 570                         if(BETWEEN(attr[i], 30, 37))
 571                                 term.c.attr.fg = attr[i] - 30;
 572                         else if(BETWEEN(attr[i], 40, 47))
 573                                 term.c.attr.bg = attr[i] - 40;
 574                         break;
 575                 }
 576         }
 577 }
 578
 579 void
 580 tsetscroll(int t, int b) {
 581         int temp;
 582
 583         LIMIT(t, 0, term.row-1);
 584         LIMIT(b, 0, term.row-1);
 585         if(t > b) {
 586                 temp = t;
 587                 t = b;
 588                 b = temp;
 589         }
 590         term.top = t;
 591         term.bot = b;
 592 }
 593
 594 void
 595 csihandle(void) {
 596         if(escseq.priv)
 597                 csidump();
 598         switch(escseq.mode) {
 599         unknown:
 600         default:
 601                 fprintf(stderr, "erresc: unknown sequence\n");
 602                 csidump();
 603                 /* die(""); */
 604                 break;
 605         case '@': /* Insert <n> blank char */
 606                 DEFAULT(escseq.arg[0], 1);
 607                 tinsertblank(escseq.arg[0]);
 608                 break;
 609         case 'A': /* Cursor <n> Up */
 610         case 'e':
 611                 DEFAULT(escseq.arg[0], 1);
 612                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 613                 break;
 614         case 'B': /* Cursor <n> Down */
 615                 DEFAULT(escseq.arg[0], 1);
 616                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 617                 break;
 618         case 'C': /* Cursor <n> Forward */
 619         case 'a':
 620                 DEFAULT(escseq.arg[0], 1);
 621                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 622                 break;
 623         case 'D': /* Cursor <n> Backward */
 624                 DEFAULT(escseq.arg[0], 1);
 625                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 626                 break;
 627         case 'E': /* Cursor <n> Down and first col */
 628                 DEFAULT(escseq.arg[0], 1);
 629                 tmoveto(0, term.c.y+escseq.arg[0]);
 630                 break;
 631         case 'F': /* Cursor <n> Up and first col */
 632                 DEFAULT(escseq.arg[0], 1);
 633                 tmoveto(0, term.c.y-escseq.arg[0]);
 634                 break;
 635         case 'G': /* Move to <col> */
 636         case '`':
 637                 DEFAULT(escseq.arg[0], 1);
 638         tmoveto(escseq.arg[0]-1, term.c.y);
 639                 break;
 640         case 'H': /* Move to <row> <col> */
 641         case 'f':
 642                 DEFAULT(escseq.arg[0], 1);
 643                 DEFAULT(escseq.arg[1], 1);
 644                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 645                 break;
 646         case 'J': /* Clear screen */
 647                 switch(escseq.arg[0]) {
 648                 case 0: /* below */
 649                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 650                         break;
 651                 case 1: /* above */
 652                         tclearregion(0, 0, term.c.x, term.c.y);
 653                         break;
 654                 case 2: /* all */
 655                         tclearregion(0, 0, term.col-1, term.row-1);
 656                         break;
 657                 }
 658                 break;
 659         case 'K': /* Clear line */
 660                 switch(escseq.arg[0]) {
 661                 case 0: /* right */
 662                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 663                         break;
 664                 case 1: /* left */
 665                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 666                         break;
 667                 case 2: /* all */
 668                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 669                         break;
 670                 }
 671                 break;
 672         case 'S':
 673         case 'L': /* Insert <n> blank lines */
 674                 DEFAULT(escseq.arg[0], 1);
 675                 tinsertblankline(escseq.arg[0]);
 676                 break;
 677         case 'l':
 678                 if(escseq.priv) {
 679                         switch(escseq.arg[0]) {
 680                         case 7:
 681                                 term.mode &= ~TMwrap;
 682                                 break;
 683                         case 25:
 684                                 term.c.hidden = 1;
 685                                 break;
 686                         }
 687                 }
 688                 break;
 689         case 'M': /* Delete <n> lines */
 690                 DEFAULT(escseq.arg[0], 1);
 691                 tdeleteline(escseq.arg[0]);
 692                 break;
 693         case 'X':
 694         case 'P': /* Delete <n> char */
 695                 DEFAULT(escseq.arg[0], 1);
 696                 tdeletechar(escseq.arg[0]);
 697                 break;
 698         case 'd': /* Move to <row> */
 699                 DEFAULT(escseq.arg[0], 1);
 700                 tmoveto(term.c.x, escseq.arg[0]-1);
 701                 break;
 702         case 'h': /* Set terminal mode */
 703                 if(escseq.priv)
 704                         switch(escseq.arg[0]) {
 705                         case 7:
 706                                 term.mode |= TMwrap;
 707                                 break;
 708                         case 25:
 709                                 term.c.hidden = 0;
 710                                 break;
 711                         case 1034:
 712                                 /* XXX: Interpret "meta" key, sets eighth bit. */
 713                                 break;
 714                         }
 715                 break;
 716         case 'm': /* Terminal attribute (color) */
 717                 tsetattr(escseq.arg, escseq.narg);
 718                 break;
 719         case 'r':
 720                 if(escseq.priv)
 721                         goto unknown;
 722                 else {
 723                         DEFAULT(escseq.arg[0], 1);
 724                         DEFAULT(escseq.arg[1], term.row);
 725                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 726                 }
 727                 break;
 728         case 's': /* Save cursor position */
 729                 tcpos(CSsave);
 730                 break;
 731         case 'u': /* Load cursor position */
 732                 tcpos(CSload);
 733                 break;
 734         }
 735 }
 736
 737 void
 738 csidump(void) {
 739         int i;
 740         printf("ESC [ %s", escseq.priv ? "? " : "");
 741         if(escseq.narg)
 742                 for(i = 0; i < escseq.narg; i++)
 743                         printf("%d ", escseq.arg[i]);
 744         if(escseq.mode)
 745                 putchar(escseq.mode);
 746         putchar('\n');
 747 }
 748
 749 void
 750 csireset(void) {
 751         memset(&escseq, 0, sizeof(escseq));
 752 }
 753
 754 void
 755 tputtab(void) {
 756         int space = TAB - term.c.x % TAB;
 757
 758         if(term.c.x + space >= term.col)
 759                 space--;
 760
 761         for(; space > 0; space--)
 762                 tcursor(CSright);
 763 }
 764
 765 void
 766 tputc(char c) {
 767 #if 0
 768         dump(c);
 769 #endif
 770         if(term.esc & ESCin) {
 771                 if(term.esc & ESCcsi) {
 772                         escseq.buf[escseq.len++] = c;
 773                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESCSIZ) {
 774                                 term.esc = 0;
 775                                 csiparse(), csihandle();
 776                         }
 777                 } else if (term.esc & ESCosc) {
 778                         if(c == ';') {
 779                                 term.titlelen = 0;
 780                                 term.esc = ESCin | ESCtitle;
 781                         }
 782                 } else if(term.esc & ESCtitle) {
 783                         if(c == '\a' || term.titlelen+1 >= TITLESIZ) {
 784                                 term.esc = 0;
 785                                 term.title[term.titlelen] = '\0';
 786                                 XStoreName(xw.dis, xw.win, term.title);
 787                         } else {
 788                                 term.title[term.titlelen++] = c;
 789                         }
 790                 } else if(term.esc & ESCcharset) {
 791                         printf("ESC ( %c\n", c);
 792                         switch(c) {
 793                         case '0': /* Line drawing crap */
 794                                 term.c.attr.mode |= ATgfx;
 795                                 break;
 796                         case 'B': /* Back to regular text */
 797                                 term.c.attr.mode &= ~ATgfx;
 798                                 break;
 799                         }
 800                         term.esc = 0;
 801                 } else {
 802                         switch(c) {
 803                         case '[':
 804                                 term.esc |= ESCcsi;
 805                                 break;
 806                         case ']':
 807                                 term.esc |= ESCosc;
 808                                 break;
 809                         case '(':
 810                                 term.esc |= ESCcharset;
 811                                 break;
 812                         case 'A':
 813                                 tmoveto(term.c.x, term.c.y-1);
 814                                 break;
 815                         case 'B':
 816                                 tmoveto(term.c.x, term.c.y+1);
 817                                 break;
 818                         case 'C':
 819                                 tmoveto(term.c.x+1, term.c.y);
 820                                 break;
 821                         case 'D':
 822                                 tmoveto(term.c.x-1, term.c.y);
 823                                 break;
 824                         default:
 825                                 fprintf(stderr, "erresc: unknown sequence ESC %02X '%c'\n", c, isprint(c)?c:'.');
 826                         }
 827                 }
 828         } else {
 829                 switch(c) {
 830                 case '\t':
 831                         tputtab();
 832                         break;
 833                 case '\b':
 834                         tcursor(CSleft);
 835                         break;
 836                 case '\r':
 837                         tmoveto(0, term.c.y);
 838                         break;
 839                 case '\n':
 840                         tnewline();
 841                         break;
 842                 case '\a':
 843                         xbell();
 844                         break;
 845                 case '\033':
 846                         csireset();
 847                         term.esc = ESCin;
 848                         break;
 849                 default:
 850                         tsetchar(c);
 851                         tcursor(CSright);
 852                         break;
 853                 }
 854         }
 855 }
 856
 857 void
 858 tputs(char *s, int len) {
 859         for(; len > 0; len--)
 860                 tputc(*s++);
 861 }
 862
 863 void
 864 tresize(int col, int row) {
 865         int i;
 866         Line *line;
 867         int minrow = MIN(row, term.row);
 868         int mincol = MIN(col, term.col);
 869
 870         if(col < 1 || row < 1)
 871                 return;
 872         /* alloc */
 873         line = calloc(row, sizeof(Line));
 874         for(i = 0 ; i < row; i++)
 875                 line[i] = calloc(col, sizeof(Glyph));
 876         /* copy */
 877         for(i = 0 ; i < minrow; i++)
 878                 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
 879         /* free */
 880         for(i = 0; i < term.row; i++)
 881                 free(term.line[i]);
 882         free(term.line);
 883
 884         LIMIT(term.c.x, 0, col-1);
 885         LIMIT(term.c.y, 0, row-1);
 886         LIMIT(term.top, 0, row-1);
 887         LIMIT(term.bot, 0, row-1);
 888
 889         term.bot = row-1;
 890         term.line = line;
 891         term.col = col, term.row = row;
 892 }
 893
 894 unsigned long
 895 xgetcol(const char *s) {
 896         XColor color;
 897         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
 898
 899         if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
 900                 color.pixel = WhitePixel(xw.dis, xw.scr);
 901                 fprintf(stderr, "Could not allocate color '%s'\n", s);
 902         }
 903         return color.pixel;
 904 }
 905
 906 void
 907 xclear(int x1, int y1, int x2, int y2) {
 908         XClearArea(xw.dis, xw.win,
 909                         x1 * xw.cw, y1 * xw.ch,
 910                         (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch,
 911                         False);
 912 }
 913
 914 void
 915 xscroll(void) {
 916         int srcy = (term.top+1) * xw.ch;
 917         int dsty = term.top * xw.ch;
 918         int height = (term.bot-term.top) * xw.ch;
 919
 920         xcursor(CShide);
 921         XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
 922         xclear(0, term.bot, term.col-1, term.bot);
 923 }
 924
 925 void
 926 xinit(void) {
 927         XGCValues values;
 928         unsigned long valuemask;
 929         XClassHint chint;
 930         XWMHints wmhint;
 931         XSizeHints shint;
 932         char *args[] = {NULL};
 933         int i;
 934
 935         xw.dis = XOpenDisplay(NULL);
 936         xw.scr = XDefaultScreen(xw.dis);
 937         if(!xw.dis)
 938                 die("Can't open display\n");
 939
 940         /* font */
 941         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)))
 942                 die("Can't load font %s\n", FONT);
 943
 944         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
 945         xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
 946
 947         /* colors */
 948         for(i = 0; i < LEN(colorname); i++)
 949                 dc.col[i] = xgetcol(colorname[i]);
 950
 951         term.c.attr.fg = DefaultFG;
 952         term.c.attr.bg = DefaultBG;
 953         term.c.attr.mode = ATnone;
 954         /* windows */
 955         xw.h = term.row * xw.ch;
 956         xw.w = term.col * xw.cw;
 957         /* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
 958         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
 959                         xw.w, xw.h, BORDER,
 960                         dc.col[DefaultBG],
 961                         dc.col[DefaultBG]);
 962         /* gc */
 963         values.foreground = XWhitePixel(xw.dis, xw.scr);
 964         values.font = dc.font->fid;
 965         valuemask = GCForeground | GCFont;
 966         dc.gc = XCreateGC(xw.dis, xw.win, valuemask, &values);
 967         XMapWindow(xw.dis, xw.win);
 968         /* wm stuff */
 969         chint.res_name = TNAME, chint.res_class = TNAME;
 970         wmhint.input = 1, wmhint.flags = InputHint;
 971         shint.height_inc = xw.ch, shint.width_inc = xw.cw;
 972         shint.height = xw.h, shint.width = xw.w;
 973         shint.flags = PSize | PResizeInc;
 974         XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
 975         XStoreName(xw.dis, xw.win, TNAME);
 976         XSync(xw.dis, 0);
 977 }
 978
 979 void
 980 xdraws (char *s, Glyph base, int x, int y, int len) {
 981         unsigned long xfg, xbg;
 982         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
 983         int i;
 984
 985         if(base.mode & ATreverse)
 986                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
 987         else
 988                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
 989
 990         XSetBackground(xw.dis, dc.gc, xbg);
 991         XSetForeground(xw.dis, dc.gc, xfg);
 992
 993         if(base.mode & ATgfx) {
 994
 995                 for(i = 0; i < len; i++)
 996                         s[i] = gfx[s[i]];
 997         }
 998
 999         XDrawImageString(xw.dis, xw.win, dc.gc, winx, winy, s, len);
1000
1001         if(base.mode & ATunderline)
1002                 XDrawLine(xw.dis, xw.win, dc.gc, winx, winy+1, winx+width-1, winy+1);
1003 }
1004
1005 void
1006 xdrawc(int x, int y, Glyph g) {
1007         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1008         unsigned long xfg, xbg;
1009
1010         /* reverse video */
1011         if(g.mode & ATreverse)
1012                 xfg = dc.col[g.bg], xbg = dc.col[g.fg];
1013         else
1014                 xfg = dc.col[g.fg], xbg = dc.col[g.bg];
1015         /* background */
1016         XSetBackground(xw.dis, dc.gc, xbg);
1017         XSetForeground(xw.dis, dc.gc, xfg);
1018         XDrawImageString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1019 }
1020
1021 void
1022 xcursor(int mode) {
1023         static int oldx = 0;
1024         static int oldy = 0;
1025         Glyph g = {' ', ATnone, DefaultBG, DefaultCS, 0};
1026
1027         LIMIT(oldx, 0, term.col-1);
1028         LIMIT(oldy, 0, term.row-1);
1029
1030         if(term.line[term.c.y][term.c.x].state & CRset)
1031                 g.c = term.line[term.c.y][term.c.x].c;
1032         /* remove the old cursor */
1033         if(term.line[oldy][oldx].state & CRset)
1034                 xdrawc(oldx, oldy, term.line[oldy][oldx]);
1035         else
1036                 xclear(oldx, oldy, oldx, oldy);
1037         /* draw the new one */
1038         if(mode == CSdraw) {
1039                 xdrawc(term.c.x, term.c.y, g);
1040                 oldx = term.c.x, oldy = term.c.y;
1041         }
1042 }
1043
1044 void
1045 draw(int redraw_all) {
1046         int i, x, y, ox;
1047         Glyph base, new;
1048         char buf[MAXDRAWBUF];
1049
1050         for(y = 0; y < term.row; y++) {
1051                 base = term.line[y][0];
1052                 i = ox = 0;
1053                 for(x = 0; x < term.col; x++) {
1054                         new = term.line[y][x];
1055                         if(!ATTRCMP(base, new) && i < MAXDRAWBUF)
1056                                 buf[i++] = new.c;
1057                         else {
1058                                 xdraws(buf, base, ox, y, i);
1059                                 buf[0] = new.c;
1060                                 i = 1;
1061                                 ox = x;
1062                                 base = new;
1063                         }
1064                 }
1065                 xdraws(buf, base, ox, y, i);
1066         }
1067         if(!term.c.hidden)
1068                 xcursor(CSdraw);
1069 }
1070
1071 void
1072 expose(XEvent *ev) {
1073         draw(SCredraw);
1074 }
1075
1076 char*
1077 kmap(KeySym k) {
1078         int i;
1079         for(i = 0; i < LEN(key); i++)
1080                 if(key[i].k == k)
1081                         return (char*)key[i].s;
1082         return NULL;
1083 }
1084
1085 void
1086 kpress(XEvent *ev) {
1087         XKeyEvent *e = &ev->xkey;
1088         KeySym ksym;
1089         char buf[32];
1090         char *customkey;
1091         int len;
1092         int meta;
1093         int shift;
1094
1095         meta  = e->state & Mod1Mask;
1096         shift = e->state & ShiftMask;
1097         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1098
1099         if(customkey = kmap(ksym))
1100                 ttywrite(customkey, strlen(customkey));
1101         else if(len > 0) {
1102                 buf[sizeof(buf)-1] = '\0';
1103                 if(meta && len == 1)
1104                         ttywrite("\033", 1);
1105                 ttywrite(buf, len);
1106         } else
1107                 switch(ksym) {
1108                 case XK_Insert:
1109                         if(shift)
1110                                 /* XXX: paste X clipboard */;
1111                         break;
1112                 default:
1113                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1114                         break;
1115                 }
1116 }
1117
1118 void
1119 resize(XEvent *e) {
1120         int col, row;
1121         col = e->xconfigure.width / xw.cw;
1122         row = e->xconfigure.height / xw.ch;
1123
1124         if(term.col != col || term.row != row) {
1125                 tresize(col, row);
1126                 ttyresize(col, row);
1127                 xw.w = e->xconfigure.width;
1128                 xw.h = e->xconfigure.height;
1129                 draw(SCredraw);
1130         }
1131 }
1132
1133 void
1134 run(void) {
1135         XEvent ev;
1136         fd_set rfd;
1137         int xfd = XConnectionNumber(xw.dis);
1138
1139         running = 1;
1140         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1141         XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
1142
1143         while(running) {
1144                 FD_ZERO(&rfd);
1145                 FD_SET(cmdfd, &rfd);
1146                 FD_SET(xfd, &rfd);
1147                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1148                         if(errno == EINTR)
1149                                 continue;
1150                         die("select failed: %s\n", SERRNO);
1151                 }
1152                 if(FD_ISSET(cmdfd, &rfd)) {
1153                         ttyread();
1154                         draw(SCupdate);
1155                 }
1156                 while(XPending(xw.dis)) {
1157                         XNextEvent(xw.dis, &ev);
1158                         if(handler[ev.type])
1159                                 (handler[ev.type])(&ev);
1160                 }
1161         }
1162 }
1163
1164 int
1165 main(int argc, char *argv[]) {
1166         if(argc == 2 && !strncmp("-v", argv[1], 3))
1167                 die("st-" VERSION ", © 2009 st engineers\n");
1168         else if(argc != 1)
1169                 die("usage: st [-v]\n");
1170         setlocale(LC_CTYPE, "");
1171         tnew(80, 24);
1172         ttynew();
1173         xinit();
1174         run();
1175         return 0;
1176 }