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