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