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