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 ESC_TITLE_SIZ 256
  27 #define ESC_BUF_SIZ   256
  28 #define ESC_ARG_SIZ   16
  29 #define DRAW_BUF_SIZ  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 { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  42 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW, CURSOR_SAVE, CURSOR_LOAD };
  43 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  44 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
  45 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  46 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  47
  48 typedef struct {
  49         char c;     /* character code  */
  50         char mode;  /* attribute flags */
  51         int fg;     /* foreground      */
  52         int bg;     /* background      */
  53         char state; /* state flags     */
  54 } Glyph;
  55
  56 typedef Glyph* Line;
  57
  58 typedef struct {
  59         Glyph attr;  /* current char attributes */
  60         int x;
  61         int y;
  62 } TCursor;
  63
  64 /* CSI Escape sequence structs */
  65 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  66 typedef struct {
  67         char buf[ESC_BUF_SIZ]; /* raw string */
  68         int len;               /* raw string length */
  69         char priv;
  70         int arg[ESC_ARG_SIZ];
  71         int narg;              /* nb of args */
  72         char mode;
  73 } CSIEscape;
  74
  75 /* Internal representation of the screen */
  76 typedef struct {
  77         int row;    /* nb row */
  78         int col;    /* nb col */
  79         Line* line; /* screen */
  80         TCursor c;  /* cursor */
  81         char hidec;
  82         int top;    /* top    scroll limit */
  83         int bot;    /* bottom scroll limit */
  84         int mode;   /* terminal mode flags */
  85         int esc;    /* escape state flags */
  86         char title[ESC_TITLE_SIZ];
  87         int titlelen;
  88 } Term;
  89
  90 /* Purely graphic info */
  91 typedef struct {
  92         Display* dis;
  93         Window win;
  94         int scr;
  95         int w;  /* window width  */
  96         int h;  /* window height */
  97         int ch; /* char height */
  98         int cw; /* char width  */
  99 } XWindow;
 100
 101 typedef struct {
 102         KeySym k;
 103         char s[ESC_BUF_SIZ];
 104 } Key;
 105
 106 #include "config.h"
 107
 108 /* Drawing Context */
 109 typedef struct {
 110         unsigned long col[LEN(colorname)];
 111         XFontStruct* font;
 112         XFontStruct* bfont;
 113         GC gc;
 114 } DC;
 115
 116 static void die(const char *errstr, ...);
 117 static void draw(int);
 118 static void execsh(void);
 119 static void sigchld(int);
 120 static void run(void);
 121
 122 static void csidump(void);
 123 static void csihandle(void);
 124 static void csiparse(void);
 125 static void csireset(void);
 126
 127 static void tclearregion(int, int, int, int);
 128 static void tcursor(int);
 129 static void tmovecursor(int);
 130 static void tdeletechar(int);
 131 static void tdeleteline(int);
 132 static void tinsertblank(int);
 133 static void tinsertblankline(int);
 134 static void tmoveto(int, int);
 135 static void tnew(int, int);
 136 static void tnewline(void);
 137 static void tputc(char);
 138 static void tputs(char*, int);
 139 static void treset(void);
 140 static void tresize(int, int);
 141 static void tscroll(void);
 142 static void tscrollup(int);
 143 static void tscrolldown(int);
 144 static void tsetattr(int*, int);
 145 static void tsetchar(char);
 146 static void tsetscroll(int, int);
 147
 148 static void ttynew(void);
 149 static void ttyread(void);
 150 static void ttyresize(int, int);
 151 static void ttywrite(const char *, size_t);
 152
 153 static unsigned long xgetcol(const char *);
 154 static void xclear(int, int, int, int);
 155 static void xcursor(int);
 156 static void xinit(void);
 157 static void xscroll(void);
 158
 159 static void expose(XEvent *);
 160 static char* kmap(KeySym);
 161 static void kpress(XEvent *);
 162 static void resize(XEvent *);
 163
 164 static void (*handler[LASTEvent])(XEvent *) = {
 165         [KeyPress] = kpress,
 166         [Expose] = expose,
 167         [ConfigureNotify] = resize
 168 };
 169
 170 /* Globals */
 171 static DC dc;
 172 static XWindow xw;
 173 static Term term;
 174 static CSIEscape escseq;
 175 static int cmdfd;
 176 static pid_t pid;
 177 static int running;
 178
 179 #ifdef DEBUG
 180 void
 181 tdump(void) {
 182         int row, col;
 183         Glyph c;
 184
 185         for(row = 0; row < term.row; row++) {
 186                 for(col = 0; col < term.col; col++) {
 187                         if(col == term.c.x && row == term.c.y)
 188                                 putchar('#');
 189                         else {
 190                                 c = term.line[row][col];
 191                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 192                         }
 193                 }
 194                 putchar('\n');
 195         }
 196 }
 197 #endif
 198
 199 void
 200 die(const char *errstr, ...) {
 201         va_list ap;
 202
 203         va_start(ap, errstr);
 204         vfprintf(stderr, errstr, ap);
 205         va_end(ap);
 206         exit(EXIT_FAILURE);
 207 }
 208
 209 void
 210 execsh(void) {
 211         char *args[3] = {SHELL, "-i", NULL};
 212         putenv("TERM=" TNAME);
 213         execvp(SHELL, args);
 214 }
 215
 216 void
 217 xbell(void) { /* visual bell */
 218         XRectangle r = { 0, 0, xw.w, xw.h };
 219         XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
 220         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 221         /* usleep(30000); */
 222         draw(SCREEN_REDRAW);
 223 }
 224
 225 void
 226 sigchld(int a) {
 227         int stat = 0;
 228         if(waitpid(pid, &stat, 0) < 0)
 229                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 230         if(WIFEXITED(stat))
 231                 exit(WEXITSTATUS(stat));
 232         else
 233                 exit(EXIT_FAILURE);
 234 }
 235
 236 void
 237 ttynew(void) {
 238         int m, s;
 239         char *pts;
 240
 241         if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
 242                 die("openpt failed: %s\n", SERRNO);
 243         if(grantpt(m) < 0)
 244                 die("grandpt failed: %s\n", SERRNO);
 245         if(unlockpt(m) < 0)
 246                 die("unlockpt failed: %s\n", SERRNO);
 247         if(!(pts = ptsname(m)))
 248                 die("ptsname failed: %s\n", SERRNO);
 249         if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
 250                 die("Couldn't open slave: %s\n", SERRNO);
 251         fcntl(s, F_SETFL, O_NDELAY);
 252         switch(pid = fork()) {
 253         case -1:
 254                 die("fork failed\n");
 255                 break;
 256         case 0:
 257                 setsid(); /* create a new process group */
 258                 dup2(s, STDIN_FILENO);
 259                 dup2(s, STDOUT_FILENO);
 260                 dup2(s, STDERR_FILENO);
 261                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 262                         die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
 263                 execsh();
 264                 break;
 265         default:
 266                 close(s);
 267                 cmdfd = m;
 268                 signal(SIGCHLD, sigchld);
 269         }
 270 }
 271
 272 void
 273 dump(char c) {
 274         static int col;
 275         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 276         if(++col % 10 == 0)
 277                 fprintf(stderr, "\n");
 278 }
 279
 280 void
 281 ttyread(void) {
 282         char buf[BUFSIZ] = {0};
 283         int ret;
 284
 285         if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
 286                 die("Couldn't read from shell: %s\n", SERRNO);
 287         else
 288                 tputs(buf, ret);
 289 }
 290
 291 void
 292 ttywrite(const char *s, size_t n) {
 293         if(write(cmdfd, s, n) == -1)
 294                 die("write error on tty: %s\n", SERRNO);
 295 }
 296
 297 void
 298 ttyresize(int x, int y) {
 299         struct winsize w;
 300
 301         w.ws_row = term.row;
 302         w.ws_col = term.col;
 303         w.ws_xpixel = w.ws_ypixel = 0;
 304         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 305                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 306 }
 307
 308 void
 309 tcursor(int mode) {
 310         static TCursor c;
 311
 312         if(mode == CURSOR_SAVE)
 313                 c = term.c;
 314         else if(mode == CURSOR_LOAD)
 315                 term.c = c, tmoveto(c.x, c.y);
 316 }
 317
 318 void
 319 treset(void) {
 320         term.c.attr.mode = ATTR_NULL;
 321         term.c.attr.fg = DefaultFG;
 322         term.c.attr.bg = DefaultBG;
 323         term.c.x = term.c.y = 0;
 324         term.hidec = 0;
 325         term.top = 0, term.bot = term.row - 1;
 326         term.mode = MODE_WRAP;
 327         tclearregion(0, 0, term.col-1, term.row-1);
 328 }
 329
 330 void
 331 tnew(int col, int row) {   /* screen size */
 332         term.row = row, term.col = col;
 333         term.top = 0, term.bot = term.row - 1;
 334         /* mode */
 335         term.mode = MODE_WRAP;
 336         /* cursor */
 337         term.c.attr.mode = ATTR_NULL;
 338         term.c.attr.fg = DefaultFG;
 339         term.c.attr.bg = DefaultBG;
 340         term.c.x = term.c.y = 0;
 341         term.hidec = 0;
 342         /* allocate screen */
 343         term.line = calloc(term.row, sizeof(Line));
 344         for(row = 0 ; row < term.row; row++)
 345                 term.line[row] = calloc(term.col, sizeof(Glyph));
 346 }
 347
 348 /* TODO: Replace with scrollup/scolldown */
 349 void
 350 tscroll(void) {
 351         Line temp = term.line[term.top];
 352         int i;
 353         /* No dirty flag to set because of xscroll */
 354         /* X stuff _before_ the line swapping (results in wrong line index) */
 355         xscroll();
 356         for(i = term.top; i < term.bot; i++)
 357                 term.line[i] = term.line[i+1];
 358         memset(temp, 0, sizeof(Glyph) * term.col);
 359         term.line[term.bot] = temp;
 360 }
 361
 362 void
 363 tscrolldown (int n) {
 364         int i;
 365         Line temp;
 366
 367         /* TODO: set dirty flag or scroll with some X func */
 368         LIMIT(n, 0, term.bot-term.top+1);
 369
 370         for(i = 0; i < n; i++)
 371                 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
 372
 373         for(i = term.bot; i >= term.top+n; i--) {
 374                 temp = term.line[i];
 375                 term.line[i] = term.line[i-n];
 376                 term.line[i-n] = temp;
 377         }
 378 }
 379
 380 void
 381 tscrollup (int n) {
 382         int i;
 383         Line temp;
 384         LIMIT(n, 0, term.bot-term.top+1);
 385
 386         /* TODO: set dirty flag or scroll with some X func */
 387         for(i = 0; i < n; i++)
 388                 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
 389
 390          for(i = term.top; i <= term.bot-n; i++) {
 391                  temp = term.line[i];
 392                  term.line[i] = term.line[i+n];
 393                  term.line[i+n] = temp;
 394          }
 395 }
 396
 397 void
 398 tnewline(void) {
 399         int y = term.c.y + 1;
 400         if(y > term.bot)
 401                 tscroll(), y = term.bot;
 402         tmoveto(0, y);
 403 }
 404
 405 void
 406 csiparse(void) {
 407         /* int noarg = 1; */
 408         char *p = escseq.buf;
 409
 410         escseq.narg = 0;
 411         if(*p == '?')
 412                 escseq.priv = 1, p++;
 413
 414         while(p < escseq.buf+escseq.len) {
 415                 while(isdigit(*p)) {
 416                         escseq.arg[escseq.narg] *= 10;
 417                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 418                 }
 419                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 420                         escseq.narg++, p++;
 421                 else {
 422                         escseq.mode = *p;
 423                         escseq.narg++;
 424                         return;
 425                 }
 426         }
 427 }
 428
 429 void
 430 tmoveto(int x, int y) {
 431         term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
 432         term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
 433 }
 434
 435 void
 436 tmovecursor(int dir) {
 437         int xf = term.c.x, yf = term.c.y;
 438
 439         switch(dir) {
 440         case CURSOR_UP:
 441                 yf--;
 442                 break;
 443         case CURSOR_DOWN:
 444                 yf++;
 445                 break;
 446         case CURSOR_LEFT:
 447                 xf--;
 448                 if(term.mode & MODE_WRAP && xf < 0) {
 449                         xf = term.col-1, yf--;
 450                         if(yf < term.top)
 451                                 yf = term.top, xf = 0;
 452                 }
 453                 break;
 454         case CURSOR_RIGHT:
 455                 xf++;
 456                 if(term.mode & MODE_WRAP && xf >= term.col) {
 457                         xf = 0, yf++;
 458                         if(yf > term.bot)
 459                                 yf = term.bot, tscroll();
 460                 }
 461                 break;
 462         }
 463         tmoveto(xf, yf);
 464 }
 465
 466 void
 467 tsetchar(char c) {
 468         term.line[term.c.y][term.c.x] = term.c.attr;
 469         term.line[term.c.y][term.c.x].c = c;
 470         term.line[term.c.y][term.c.x].state |= GLYPH_SET | GLYPH_DIRTY;
 471 }
 472
 473 void
 474 tclearregion(int x1, int y1, int x2, int y2) {
 475         int y, temp;
 476
 477         if(x1 > x2)
 478                 temp = x1, x1 = x2, x2 = temp;
 479         if(y1 > y2)
 480                 temp = y1, y1 = y2, y2 = temp;
 481
 482         LIMIT(x1, 0, term.col-1);
 483         LIMIT(x2, 0, term.col-1);
 484         LIMIT(y1, 0, term.row-1);
 485         LIMIT(y2, 0, term.row-1);
 486
 487         for(y = y1; y <= y2; y++)
 488                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 489
 490         xclear(x1, y1, x2, y2);
 491 }
 492
 493 void
 494 tdeletechar(int n) {
 495         int src = term.c.x + n;
 496         int dst = term.c.x;
 497         int size = term.col - src;
 498
 499         if(src >= term.col) {
 500                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 501                 return;
 502         }
 503         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 504         tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
 505 }
 506
 507 void
 508 tinsertblank(int n) {
 509         int src = term.c.x;
 510         int dst = src + n;
 511         int size = term.col - n - src;
 512
 513         if(dst >= term.col) {
 514                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 515                 return;
 516         }
 517         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 518         tclearregion(src, term.c.y, dst, term.c.y);
 519 }
 520
 521 void
 522 tsetlinestate(int n, int state) {
 523         int i;
 524         for(i = 0; i < term.col; i++)
 525                 term.line[n][i].state |= state;
 526 }
 527
 528 void
 529 tinsertblankline(int n) {
 530         int i;
 531         Line blank;
 532         int bot = term.bot;
 533
 534         if(term.c.y > term.bot)
 535                 bot = term.row - 1;
 536         else if(term.c.y < term.top)
 537                 bot = term.top - 1;
 538         if(term.c.y + n >= bot) {
 539                 tclearregion(0, term.c.y, term.col-1, bot);
 540                 return;
 541         }
 542         for(i = bot; i >= term.c.y+n; i--) {
 543                 /* swap deleted line <-> blanked line */
 544                 blank = term.line[i];
 545                 term.line[i] = term.line[i-n];
 546                 term.line[i-n] = blank;
 547                 /* blank it */
 548                 memset(blank, 0, term.col * sizeof(Glyph));
 549                 tsetlinestate(i, GLYPH_DIRTY);
 550                 tsetlinestate(i-n, GLYPH_DIRTY);
 551         }
 552 }
 553
 554 void
 555 tdeleteline(int n) {
 556         int i;
 557         Line blank;
 558         int bot = term.bot;
 559
 560         if(term.c.y > term.bot)
 561                 bot = term.row - 1;
 562         else if(term.c.y < term.top)
 563                 bot = term.top - 1;
 564         if(term.c.y + n >= bot) {
 565                 tclearregion(0, term.c.y, term.col-1, bot);
 566                 return;
 567         }
 568         for(i = term.c.y; i <= bot-n; i++) {
 569                 /* swap deleted line <-> blanked line */
 570                 blank = term.line[i];
 571                 term.line[i] = term.line[i+n];
 572                 term.line[i+n] = blank;
 573                 /* blank it */
 574                 memset(blank, 0, term.col * sizeof(Glyph));
 575                 tsetlinestate(i, GLYPH_DIRTY);
 576                 tsetlinestate(i-n, GLYPH_DIRTY);
 577         }
 578 }
 579
 580 void
 581 tsetattr(int *attr, int l) {
 582         int i;
 583
 584         for(i = 0; i < l; i++) {
 585                 switch(attr[i]) {
 586                 case 0:
 587                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 588                         term.c.attr.fg = DefaultFG;
 589                         term.c.attr.bg = DefaultBG;
 590                         break;
 591                 case 1:
 592                         term.c.attr.mode |= ATTR_BOLD;
 593                         break;
 594                 case 4:
 595                         term.c.attr.mode |= ATTR_UNDERLINE;
 596                         break;
 597                 case 7:
 598                         term.c.attr.mode |= ATTR_REVERSE;
 599                         break;
 600                 case 22:
 601                         term.c.attr.mode &= ~ATTR_BOLD;
 602                         break;
 603                 case 24:
 604                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 605                         break;
 606                 case 27:
 607                         term.c.attr.mode &= ~ATTR_REVERSE;
 608                         break;
 609                 case 39:
 610                         term.c.attr.fg = DefaultFG;
 611                         break;
 612                 case 49:
 613                         term.c.attr.fg = DefaultBG;
 614                         break;
 615                 default:
 616                         if(BETWEEN(attr[i], 30, 37))
 617                                 term.c.attr.fg = attr[i] - 30;
 618                         else if(BETWEEN(attr[i], 40, 47))
 619                                 term.c.attr.bg = attr[i] - 40;
 620                         else
 621                                 fprintf(stderr, "erresc: gfx attr %d unkown\n", attr[i]);
 622                         break;
 623                 }
 624         }
 625 }
 626
 627 void
 628 tsetscroll(int t, int b) {
 629         int temp;
 630
 631         LIMIT(t, 0, term.row-1);
 632         LIMIT(b, 0, term.row-1);
 633         if(t > b) {
 634                 temp = t;
 635                 t = b;
 636                 b = temp;
 637         }
 638         term.top = t;
 639         term.bot = b;
 640 }
 641
 642 void
 643 csihandle(void) {
 644         switch(escseq.mode) {
 645         default:
 646         unknown:
 647                 printf("erresc: unknown csi ");
 648                 csidump();
 649                 /* die(""); */
 650                 break;
 651         case '@': /* ICH -- Insert <n> blank char */
 652                 DEFAULT(escseq.arg[0], 1);
 653                 tinsertblank(escseq.arg[0]);
 654                 break;
 655         case 'A': /* CUU -- Cursor <n> Up */
 656         case 'e':
 657                 DEFAULT(escseq.arg[0], 1);
 658                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 659                 break;
 660         case 'B': /* CUD -- Cursor <n> Down */
 661                 DEFAULT(escseq.arg[0], 1);
 662                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 663                 break;
 664         case 'C': /* CUF -- Cursor <n> Forward */
 665         case 'a':
 666                 DEFAULT(escseq.arg[0], 1);
 667                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 668                 break;
 669         case 'D': /* CUB -- Cursor <n> Backward */
 670                 DEFAULT(escseq.arg[0], 1);
 671                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 672                 break;
 673         case 'E': /* CNL -- Cursor <n> Down and first col */
 674                 DEFAULT(escseq.arg[0], 1);
 675                 tmoveto(0, term.c.y+escseq.arg[0]);
 676                 break;
 677         case 'F': /* CPL -- Cursor <n> Up and first col */
 678                 DEFAULT(escseq.arg[0], 1);
 679                 tmoveto(0, term.c.y-escseq.arg[0]);
 680                 break;
 681         case 'G': /* CHA -- Move to <col> */
 682         case '`': /* XXX: HPA -- same? */
 683                 DEFAULT(escseq.arg[0], 1);
 684         tmoveto(escseq.arg[0]-1, term.c.y);
 685                 break;
 686         case 'H': /* CUP -- Move to <row> <col> */
 687         case 'f': /* XXX: HVP -- same? */
 688                 DEFAULT(escseq.arg[0], 1);
 689                 DEFAULT(escseq.arg[1], 1);
 690                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 691                 break;
 692         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 693         case 'J': /* ED -- Clear screen */
 694                 switch(escseq.arg[0]) {
 695                 case 0: /* below */
 696                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 697                         break;
 698                 case 1: /* above */
 699                         tclearregion(0, 0, term.c.x, term.c.y);
 700                         break;
 701                 case 2: /* all */
 702                         tclearregion(0, 0, term.col-1, term.row-1);
 703                         break;
 704                 case 3: /* XXX: erase saved lines (xterm) */
 705                 default:
 706                         goto unknown;
 707                 }
 708                 break;
 709         case 'K': /* EL -- Clear line */
 710                 switch(escseq.arg[0]) {
 711                 case 0: /* right */
 712                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 713                         break;
 714                 case 1: /* left */
 715                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 716                         break;
 717                 case 2: /* all */
 718                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 719                         break;
 720                 }
 721                 break;
 722         case 'S': /* SU -- Scroll <n> line up */
 723                 DEFAULT(escseq.arg[0], 1);
 724                 tscrollup(escseq.arg[0]);
 725                 break;
 726         case 'T': /* SD -- Scroll <n> line down */
 727                 DEFAULT(escseq.arg[0], 1);
 728                 tscrolldown(escseq.arg[0]);
 729                 break;
 730         case 'L': /* IL -- Insert <n> blank lines */
 731                 DEFAULT(escseq.arg[0], 1);
 732                 tinsertblankline(escseq.arg[0]);
 733                 break;
 734         case 'l': /* RM -- Reset Mode */
 735                 if(escseq.priv) {
 736                         switch(escseq.arg[0]) {
 737                         case 1:
 738                                 term.mode &= ~MODE_APPKEYPAD;
 739                                 break;
 740                         case 7:
 741                                 term.mode &= ~MODE_WRAP;
 742                                 break;
 743                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 744                                 break;
 745                         case 25:
 746                                 term.hidec = 1;
 747                                 break;
 748                         case 1048: /* XXX: no alt. screen to erase/save */
 749                         case 1049:
 750                                 tcursor(CURSOR_LOAD);
 751                                 tclearregion(0, 0, term.col-1, term.row-1);
 752                                 break;
 753                         default:
 754                                 goto unknown;
 755                         }
 756                 } else {
 757                         switch(escseq.arg[0]) {
 758                         case 4:
 759                                 term.mode &= ~MODE_INSERT;
 760                                 break;
 761                         default:
 762                                 goto unknown;
 763                         }
 764                 }
 765                 break;
 766         case 'M': /* DL -- Delete <n> lines */
 767                 DEFAULT(escseq.arg[0], 1);
 768                 tdeleteline(escseq.arg[0]);
 769                 break;
 770         case 'X': /* ECH -- Erase <n> char */
 771                 DEFAULT(escseq.arg[0], 1);
 772                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 773                 break;
 774         case 'P': /* DCH -- Delete <n> char */
 775                 DEFAULT(escseq.arg[0], 1);
 776                 tdeletechar(escseq.arg[0]);
 777                 break;
 778         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 779         case 'd': /* VPA -- Move to <row> */
 780                 DEFAULT(escseq.arg[0], 1);
 781                 tmoveto(term.c.x, escseq.arg[0]-1);
 782                 break;
 783         case 'h': /* SM -- Set terminal mode */
 784                 if(escseq.priv) {
 785                         switch(escseq.arg[0]) {
 786                         case 1:
 787                                 term.mode |= MODE_APPKEYPAD;
 788                                 break;
 789                         case 7:
 790                                 term.mode |= MODE_WRAP;
 791                                 break;
 792                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 793                                 break;
 794                         case 25:
 795                                 term.hidec = 0;
 796                                 break;
 797                         case 1048:
 798                         case 1049: /* XXX: no alt. screen to erase/save */
 799                                 tcursor(CURSOR_SAVE);
 800                                 tclearregion(0, 0, term.col-1, term.row-1);
 801                                 break;
 802                         default: goto unknown;
 803                         }
 804                 } else {
 805                         switch(escseq.arg[0]) {
 806                         case 4:
 807                                 term.mode |= MODE_INSERT;
 808                                 break;
 809                         default: goto unknown;
 810                         }
 811                 };
 812                 break;
 813         case 'm': /* SGR -- Terminal attribute (color) */
 814                 tsetattr(escseq.arg, escseq.narg);
 815                 break;
 816         case 'r': /* DECSTBM -- Set Scrolling Region */
 817                 if(escseq.priv)
 818                         goto unknown;
 819                 else {
 820                         DEFAULT(escseq.arg[0], 1);
 821                         DEFAULT(escseq.arg[1], term.row);
 822                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 823                 }
 824                 break;
 825         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 826                 tcursor(CURSOR_SAVE);
 827                 break;
 828         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 829                 tcursor(CURSOR_LOAD);
 830                 break;
 831         }
 832 }
 833
 834 void
 835 csidump(void) {
 836         int i;
 837         printf("ESC [ %s", escseq.priv ? "? " : "");
 838         if(escseq.narg)
 839                 for(i = 0; i < escseq.narg; i++)
 840                         printf("%d ", escseq.arg[i]);
 841         if(escseq.mode)
 842                 putchar(escseq.mode);
 843         putchar('\n');
 844 }
 845
 846 void
 847 csireset(void) {
 848         memset(&escseq, 0, sizeof(escseq));
 849 }
 850
 851 void
 852 tputtab(void) {
 853         int space = TAB - term.c.x % TAB;
 854
 855         if(term.c.x + space >= term.col)
 856                 space--;
 857
 858         for(; space > 0; space--)
 859                 tmovecursor(CURSOR_RIGHT);
 860 }
 861
 862 void
 863 tputc(char c) {
 864         /* dump(c); */
 865         if(term.esc & ESC_START) {
 866                 if(term.esc & ESC_CSI) {
 867                         escseq.buf[escseq.len++] = c;
 868                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 869                                 term.esc = 0;
 870                                 csiparse(), csihandle();
 871                         }
 872                 } else if(term.esc & ESC_OSC) {
 873                         if(c == ';') {
 874                                 term.titlelen = 0;
 875                                 term.esc = ESC_START | ESC_TITLE;
 876                         }
 877                 } else if(term.esc & ESC_TITLE) {
 878                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 879                                 term.esc = 0;
 880                                 term.title[term.titlelen] = '\0';
 881                                 XStoreName(xw.dis, xw.win, term.title);
 882                         } else {
 883                                 term.title[term.titlelen++] = c;
 884                         }
 885                 } else if(term.esc & ESC_ALTCHARSET) {
 886                         switch(c) {
 887                         case '0': /* Line drawing crap */
 888                                 term.c.attr.mode |= ATTR_GFX;
 889                                 break;
 890                         case 'B': /* Back to regular text */
 891                                 term.c.attr.mode &= ~ATTR_GFX;
 892                                 break;
 893                         default:
 894                                 printf("esc unhandled charset: ESC ( %c\n", c);
 895                         }
 896                         term.esc = 0;
 897                 } else {
 898                         switch(c) {
 899                         case '[':
 900                                 term.esc |= ESC_CSI;
 901                                 break;
 902                         case ']':
 903                                 term.esc |= ESC_OSC;
 904                                 break;
 905                         case '(':
 906                                 term.esc |= ESC_ALTCHARSET;
 907                                 break;
 908                         case 'A':
 909                                 tmoveto(term.c.x, term.c.y-1);
 910                                 term.esc = 0;
 911                                 break;
 912                         case 'B':
 913                                 tmoveto(term.c.x, term.c.y+1);
 914                                 term.esc = 0;
 915                                 break;
 916                         case 'C':
 917                                 tmoveto(term.c.x+1, term.c.y);
 918                                 term.esc = 0;
 919                                 break;
 920                         case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
 921                                 tmoveto(term.c.x-1, term.c.y);
 922                                 term.esc = 0;
 923                                 break;
 924                         case 'E': /* NEL -- Next line */
 925                                 tnewline();
 926                                 term.esc = 0;
 927                                 break;
 928                         case 'M': /* RI -- Reverse index */
 929                                 if(term.c.y == term.top)
 930                                         tscrolldown(1);
 931                                 else
 932                                         tmoveto(term.c.x, term.c.y-1);
 933                                 term.esc = 0;
 934                                 break;
 935                         case 'c': /* RIS -- Reset to inital state */
 936                                 treset();
 937                                 term.esc = 0;
 938                                 break;
 939                         case '=': /* DECPAM */
 940                                 term.mode |= MODE_APPKEYPAD;
 941                                 term.esc = 0;
 942                                 break;
 943                         case '>': /* DECPNM */
 944                                 term.mode &= ~MODE_APPKEYPAD;
 945                                 term.esc = 0;
 946                                 break;
 947                         case '7':
 948                                 tcursor(CURSOR_SAVE);
 949                                 term.esc = 0;
 950                                 break;
 951                         case '8':
 952                                 tcursor(CURSOR_LOAD);
 953                                 term.esc = 0;
 954                                 break;
 955                         default:
 956                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
 957                                 term.esc = 0;
 958                         }
 959                 }
 960         } else {
 961                 switch(c) {
 962                 case '\t':
 963                         tputtab();
 964                         break;
 965                 case '\b':
 966                         tmovecursor(CURSOR_LEFT);
 967                         break;
 968                 case '\r':
 969                         tmoveto(0, term.c.y);
 970                         break;
 971                 case '\n':
 972                         tnewline();
 973                         break;
 974                 case '\a':
 975                         xbell();
 976                         break;
 977                 case '\033':
 978                         csireset();
 979                         term.esc = ESC_START;
 980                         break;
 981                 default:
 982                         tsetchar(c);
 983                         tmovecursor(CURSOR_RIGHT);
 984                         break;
 985                 }
 986         }
 987 }
 988
 989 void
 990 tputs(char *s, int len) {
 991         for(; len > 0; len--)
 992                 tputc(*s++);
 993 }
 994
 995 void
 996 tresize(int col, int row) {
 997         int i;
 998         Line *line;
 999         int minrow = MIN(row, term.row);
1000         int mincol = MIN(col, term.col);
1001
1002         if(col < 1 || row < 1)
1003                 return;
1004         /* alloc */
1005         line = calloc(row, sizeof(Line));
1006         for(i = 0 ; i < row; i++)
1007                 line[i] = calloc(col, sizeof(Glyph));
1008         /* copy */
1009         for(i = 0 ; i < minrow; i++)
1010                 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
1011         /* free */
1012         for(i = 0; i < term.row; i++)
1013                 free(term.line[i]);
1014         free(term.line);
1015
1016         LIMIT(term.c.x, 0, col-1);
1017         LIMIT(term.c.y, 0, row-1);
1018         LIMIT(term.top, 0, row-1);
1019         LIMIT(term.bot, 0, row-1);
1020
1021         term.bot = row-1;
1022         term.line = line;
1023         term.col = col, term.row = row;
1024 }
1025
1026 unsigned long
1027 xgetcol(const char *s) {
1028         XColor color;
1029         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1030
1031         if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
1032                 color.pixel = WhitePixel(xw.dis, xw.scr);
1033                 fprintf(stderr, "Could not allocate color '%s'\n", s);
1034         }
1035         return color.pixel;
1036 }
1037
1038 void
1039 xclear(int x1, int y1, int x2, int y2) {
1040         XClearArea(xw.dis, xw.win,
1041                         x1 * xw.cw, y1 * xw.ch,
1042                         (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch,
1043                         False);
1044 }
1045
1046 void
1047 xscroll(void) {
1048         int srcy = (term.top+1) * xw.ch;
1049         int dsty = term.top * xw.ch;
1050         int height = (term.bot-term.top) * xw.ch;
1051
1052         xcursor(CURSOR_HIDE);
1053         XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
1054         xclear(0, term.bot, term.col-1, term.bot);
1055 }
1056
1057 void
1058 xinit(void) {
1059         XClassHint chint;
1060         XWMHints wmhint;
1061         XSizeHints shint;
1062         char *args[] = {NULL};
1063         int i;
1064
1065         xw.dis = XOpenDisplay(NULL);
1066         xw.scr = XDefaultScreen(xw.dis);
1067         if(!xw.dis)
1068                 die("Can't open display\n");
1069
1070         /* font */
1071         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1072                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1073
1074         /* XXX: Assuming same size for bold font */
1075         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1076         xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
1077
1078         /* colors */
1079         for(i = 0; i < LEN(colorname); i++)
1080                 dc.col[i] = xgetcol(colorname[i]);
1081
1082         term.c.attr.fg = DefaultFG;
1083         term.c.attr.bg = DefaultBG;
1084         term.c.attr.mode = ATTR_NULL;
1085         /* windows */
1086         xw.h = term.row * xw.ch;
1087         xw.w = term.col * xw.cw;
1088         /* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
1089         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1090                         xw.w, xw.h, BORDER,
1091                         dc.col[DefaultBG],
1092                         dc.col[DefaultBG]);
1093         /* gc */
1094         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1095         XMapWindow(xw.dis, xw.win);
1096         /* wm stuff */
1097         chint.res_name = TNAME, chint.res_class = TNAME;
1098         wmhint.input = 1, wmhint.flags = InputHint;
1099         shint.height_inc = xw.ch, shint.width_inc = xw.cw;
1100         shint.height = xw.h, shint.width = xw.w;
1101         shint.flags = PSize | PResizeInc;
1102         XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
1103         XStoreName(xw.dis, xw.win, TNAME);
1104         XSync(xw.dis, 0);
1105 }
1106
1107 void
1108 xdraws(char *s, Glyph base, int x, int y, int len) {
1109         unsigned long xfg, xbg;
1110         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1111         int i;
1112
1113         if(base.mode & ATTR_REVERSE)
1114                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1115         else
1116                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1117
1118         XSetBackground(xw.dis, dc.gc, xbg);
1119         XSetForeground(xw.dis, dc.gc, xfg);
1120
1121         if(base.mode & ATTR_GFX)
1122                 for(i = 0; i < len; i++)
1123                         s[i] = gfx[s[i]];
1124
1125         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1126         XDrawImageString(xw.dis, xw.win, dc.gc, winx, winy, s, len);
1127
1128         if(base.mode & ATTR_UNDERLINE)
1129                 XDrawLine(xw.dis, xw.win, dc.gc, winx, winy+1, winx+width-1, winy+1);
1130 }
1131
1132 void
1133 xcursor(int mode) {
1134         static int oldx = 0;
1135         static int oldy = 0;
1136         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1137
1138         LIMIT(oldx, 0, term.col-1);
1139         LIMIT(oldy, 0, term.row-1);
1140
1141         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1142                 g.c = term.line[term.c.y][term.c.x].c;
1143
1144         /* remove the old cursor */
1145         if(term.line[oldy][oldx].state & GLYPH_SET)
1146                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1147         else
1148                 xclear(oldx, oldy, oldx, oldy);
1149
1150         /* draw the new one */
1151         if(mode == CURSOR_DRAW) {
1152                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1153                 oldx = term.c.x, oldy = term.c.y;
1154         }
1155 }
1156
1157
1158 #ifdef DEBUG
1159 /* basic drawing routines */
1160 void
1161 xdrawc(int x, int y, Glyph g) {
1162         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1163         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1164         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1165         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1166         XDrawImageString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1167 }
1168
1169 void
1170 draw_(int dummy) {
1171         int x, y;
1172
1173         xclear(0, 0, term.col-1, term.row-1);
1174         for(y = 0; y < term.row; y++)
1175                 for(x = 0; x < term.col; x++)
1176                         if(term.line[y][x].state & GLYPH_SET)
1177                                 xdrawc(x, y, term.line[y][x]);
1178
1179         if(!term.hidec)
1180                 xcursor(CURSOR_DRAW);
1181 }
1182 #endif
1183
1184 void
1185 draw(int redraw_all) {
1186         int i, x, y, ox;
1187         Glyph base, new;
1188         char buf[DRAW_BUF_SIZ];
1189
1190         /* XXX: optimize with GLYPH_DIRTY hint */
1191         for(y = 0; y < term.row; y++) {
1192                 base = term.line[y][0];
1193                 i = ox = 0;
1194                 for(x = 0; x < term.col; x++) {
1195                         new = term.line[y][x];
1196                         if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1197                                 buf[i++] = new.c;
1198                         else {
1199                                 xdraws(buf, base, ox, y, i);
1200                                 buf[0] = new.c;
1201                                 i = 1;
1202                                 ox = x;
1203                                 base = new;
1204                         }
1205                 }
1206                 xdraws(buf, base, ox, y, i);
1207         }
1208         xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1209 }
1210
1211 void
1212 expose(XEvent *ev) {
1213         draw(SCREEN_REDRAW);
1214 }
1215
1216 char*
1217 kmap(KeySym k) {
1218         int i;
1219         for(i = 0; i < LEN(key); i++)
1220                 if(key[i].k == k)
1221                         return (char*)key[i].s;
1222         return NULL;
1223 }
1224
1225 void
1226 kpress(XEvent *ev) {
1227         XKeyEvent *e = &ev->xkey;
1228         KeySym ksym;
1229         char buf[32];
1230         char *customkey;
1231         int len;
1232         int meta;
1233         int shift;
1234
1235         meta  = e->state & Mod1Mask;
1236         shift = e->state & ShiftMask;
1237         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1238
1239         if(customkey = kmap(ksym))
1240                 ttywrite(customkey, strlen(customkey));
1241         else if(len > 0) {
1242                 buf[sizeof(buf)-1] = '\0';
1243                 if(meta && len == 1)
1244                         ttywrite("\033", 1);
1245                 ttywrite(buf, len);
1246         } else
1247                 switch(ksym) {
1248                 case XK_Up:
1249                 case XK_Down:
1250                 case XK_Left:
1251                 case XK_Right:
1252                         sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1253                         ttywrite(buf, 3);
1254                         break;
1255                 case XK_Insert:
1256                         if(shift)
1257                                 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1258                         break;
1259                 default:
1260                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1261                         break;
1262                 }
1263 }
1264
1265 void
1266 resize(XEvent *e) {
1267         int col, row;
1268         col = e->xconfigure.width / xw.cw;
1269         row = e->xconfigure.height / xw.ch;
1270
1271         if(term.col != col || term.row != row) {
1272                 tresize(col, row);
1273                 ttyresize(col, row);
1274                 xw.w = e->xconfigure.width;
1275                 xw.h = e->xconfigure.height;
1276                 draw(SCREEN_REDRAW);
1277         }
1278 }
1279
1280 void
1281 run(void) {
1282         XEvent ev;
1283         fd_set rfd;
1284         int xfd = XConnectionNumber(xw.dis);
1285
1286         running = 1;
1287         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1288         XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
1289
1290         while(running) {
1291                 FD_ZERO(&rfd);
1292                 FD_SET(cmdfd, &rfd);
1293                 FD_SET(xfd, &rfd);
1294                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1295                         if(errno == EINTR)
1296                                 continue;
1297                         die("select failed: %s\n", SERRNO);
1298                 }
1299                 if(FD_ISSET(cmdfd, &rfd)) {
1300                         ttyread();
1301                         draw(SCREEN_UPDATE);
1302                 }
1303                 while(XPending(xw.dis)) {
1304                         XNextEvent(xw.dis, &ev);
1305                         if(handler[ev.type])
1306                                 (handler[ev.type])(&ev);
1307                 }
1308         }
1309 }
1310
1311 int
1312 main(int argc, char *argv[]) {
1313         if(argc == 2 && !strncmp("-v", argv[1], 3))
1314                 die("st-" VERSION ", © 2009 st engineers\n");
1315         else if(argc != 1)
1316                 die("usage: st [-v]\n");
1317         setlocale(LC_CTYPE, "");
1318         tnew(80, 24);
1319         ttynew();
1320         xinit();
1321         run();
1322         return 0;
1323 }