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