st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <locale.h>
   7 #include <stdarg.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <signal.h>
  12 #include <sys/ioctl.h>
  13 #include <sys/select.h>
  14 #include <sys/stat.h>
  15 #include <sys/types.h>
  16 #include <sys/wait.h>
  17 #include <unistd.h>
  18 #include <X11/Xlib.h>
  19 #include <X11/keysym.h>
  20 #include <X11/Xutil.h>
  21
  22 #define TNAME "st"
  23
  24 /* Arbitrary sizes */
  25 #define ESCSIZ 256
  26 #define ESCARG 16
  27
  28 #define SERRNO strerror(errno)
  29 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  30 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  31 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  32 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  33 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  34 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  35
  36 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  37 enum { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4 };
  38 enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSwrap, CSsave, CSload };
  39 enum { CRset=1, CRupdate=2 };
  40 enum { TMwrap=1, TMinsert=2 };
  41 enum { SCupdate, SCredraw };
  42
  43 typedef int Color;
  44
  45 typedef struct {
  46         KeySym k;
  47         char s[ESCSIZ];
  48 } Key;
  49
  50 typedef struct {
  51         char c;     /* character code  */
  52         char mode;  /* attribute flags */
  53         Color fg;   /* foreground      */
  54         Color bg;   /* background      */
  55         char state; /* state flag      */
  56 } Glyph;
  57
  58 typedef Glyph* Line;
  59
  60 typedef struct {
  61         Glyph attr;  /* current char attributes */
  62         char hidden;
  63         int x;
  64         int y;
  65 } TCursor;
  66
  67 /* Escape sequence structs */
  68 /* ESC <pre> [[ [<priv>] <arg> [;]] <mode>] */
  69 typedef struct {
  70         char buf[ESCSIZ+1]; /* raw string */
  71         int len;            /* raw string length */
  72         char pre;
  73         char priv;
  74         int arg[ESCARG+1];
  75         int narg;           /* nb of args */
  76         char mode;
  77 } Escseq;
  78
  79 /* Internal representation of the screen */
  80 typedef struct {
  81         int row;    /* nb row */
  82         int col;    /* nb col */
  83         Line* line; /* screen */
  84         TCursor c;  /* cursor */
  85         int top;    /* top    scroll limit */
  86         int bot;    /* bottom scroll limit */
  87         int mode;   /* terminal mode */
  88 } Term;
  89
  90 /* Purely graphic info */
  91 typedef struct {
  92         Display* dis;
  93         Window win;
  94         int scr;
  95         int w;  /* window width  */
  96         int h;  /* window height */
  97         int ch; /* char height */
  98         int cw; /* char width  */
  99 } XWindow;
 100
 101 #include "config.h"
 102
 103 /* Drawing Context */
 104 typedef struct {
 105         unsigned long col[LEN(colorname)];
 106         XFontStruct* font;
 107         GC gc;
 108 } DC;
 109
 110 void die(const char *errstr, ...);
 111 void draw(int);
 112 void execsh(void);
 113 void sigchld(int);
 114 char* kmap(KeySym);
 115 void kpress(XKeyEvent *);
 116 void resize(XEvent *);
 117 void run(void);
 118
 119 int escaddc(char);
 120 int escfinal(char);
 121 void escdump(void);
 122 void eschandle(void);
 123 void escparse(void);
 124 void escreset(void);
 125
 126 void tclearregion(int, int, int, int);
 127 void tcpos(int);
 128 void tcursor(int);
 129 void tdeletechar(int);
 130 void tdeleteline(int);
 131 void tdump(void);
 132 void tinsertblank(int);
 133 void tinsertblankline(int);
 134 void tmoveto(int, int);
 135 void tnew(int, int);
 136 void tnewline(void);
 137 void tputc(char);
 138 void tputs(char*, int);
 139 void tresize(int, int);
 140 void tscroll(void);
 141 void tsetattr(int*, int);
 142 void tsetchar(char);
 143 void tsetscroll(int, int);
 144
 145 void ttynew(void);
 146 void ttyread(void);
 147 void ttyresize(int, int);
 148 void ttywrite(char *, size_t);
 149
 150 unsigned long xgetcol(const char *);
 151 void xclear(int, int, int, int);
 152 void xcursor(int);
 153 void xdrawc(int, int, Glyph);
 154 void xinit(void);
 155 void xscroll(void);
 156
 157 void cursor(int);
 158
 159 /* Globals */
 160 DC dc;
 161 XWindow xw;
 162 Term term;
 163 Escseq escseq;
 164 int cmdfd;
 165 pid_t pid;
 166 int running;
 167
 168 void
 169 die(const char *errstr, ...) {
 170         va_list ap;
 171
 172         va_start(ap, errstr);
 173         vfprintf(stderr, errstr, ap);
 174         va_end(ap);
 175         exit(EXIT_FAILURE);
 176 }
 177
 178 void
 179 execsh(void) {
 180         char *args[3] = {SHELL, "-i", NULL};
 181         putenv("TERM=" TNAME);
 182         execvp(SHELL, args);
 183 }
 184
 185 void
 186 xbell(void) { /* visual bell */
 187         XRectangle r = { 0, 0, xw.w, xw.h };
 188         XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
 189         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 190         /* usleep(30000); */
 191         draw(SCredraw);
 192 }
 193
 194 void
 195 sigchld(int a) {
 196         int stat = 0;
 197         if(waitpid(pid, &stat, 0) < 0)
 198                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 199         if(WIFEXITED(stat))
 200                 exit(WEXITSTATUS(stat));
 201         else
 202                 exit(EXIT_FAILURE);
 203 }
 204
 205 void
 206 ttynew(void) {
 207         int m, s;
 208         char *pts;
 209
 210         if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
 211                 die("openpt failed: %s\n", SERRNO);
 212         if(grantpt(m) < 0)
 213                 die("grandpt failed: %s\n", SERRNO);
 214         if(unlockpt(m) < 0)
 215                 die("unlockpt failed: %s\n", SERRNO);
 216         if(!(pts = ptsname(m)))
 217                 die("ptsname failed: %s\n", SERRNO);
 218         if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
 219                 die("Couldn't open slave: %s\n", SERRNO);
 220         fcntl(s, F_SETFL, O_NDELAY);
 221         switch(pid = fork()) {
 222         case -1:
 223                 die("fork failed\n");
 224                 break;
 225         case 0:
 226                 setsid(); /* create a new process group */
 227                 dup2(s, STDIN_FILENO);
 228                 dup2(s, STDOUT_FILENO);
 229                 dup2(s, STDERR_FILENO);
 230                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 231                         die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
 232                 execsh();
 233                 break;
 234         default:
 235                 close(s);
 236                 cmdfd = m;
 237                 signal(SIGCHLD, sigchld);
 238         }
 239 }
 240
 241 void
 242 dump(char c) {
 243         static int col;
 244         fprintf(stderr, " %02x %c ", c, isprint(c)?c:'.');
 245         if(++col % 10 == 0)
 246                 fprintf(stderr, "\n");
 247 }
 248
 249 void
 250 ttyread(void) {
 251         char buf[BUFSIZ] = {0};
 252         int ret;
 253
 254         switch(ret = read(cmdfd, buf, BUFSIZ)) {
 255         case -1:
 256                 die("Couldn't read from shell: %s\n", SERRNO);
 257                 break;
 258         default:
 259                 tputs(buf, ret);
 260         }
 261 }
 262
 263 void
 264 ttywrite(char *s, size_t n) {
 265         if(write(cmdfd, s, n) == -1)
 266                 die("write error on tty: %s\n", SERRNO);
 267 }
 268
 269 void
 270 ttyresize(int x, int y) {
 271         struct winsize w;
 272
 273         w.ws_row = term.row;
 274         w.ws_col = term.col;
 275         w.ws_xpixel = w.ws_ypixel = 0;
 276         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 277                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 278 }
 279
 280 int
 281 escfinal(char c) {
 282         if(escseq.len == 1)
 283                 switch(c) {
 284                 case '[':
 285                 case ']':
 286                 case '(':
 287                         return 0;
 288                 case '=':
 289                 case '>':
 290                 default:
 291                         return 1;
 292                 }
 293         else if(BETWEEN(c, 0x40, 0x7E))
 294                 return 1;
 295         return 0;
 296 }
 297
 298 void
 299 tcpos(int mode) {
 300         static int x = 0;
 301         static int y = 0;
 302
 303         if(mode == CSsave)
 304                 x = term.c.x, y = term.c.y;
 305         else if(mode == CSload)
 306                 tmoveto(x, y);
 307 }
 308
 309 void
 310 tnew(int col, int row) {   /* screen size */
 311         term.row = row, term.col = col;
 312         term.top = 0, term.bot = term.row - 1;
 313         /* mode */
 314         term.mode = TMwrap;
 315         /* cursor */
 316         term.c.attr.mode = ATnone;
 317         term.c.attr.fg = DefaultFG;
 318         term.c.attr.bg = DefaultBG;
 319         term.c.x = term.c.y = 0;
 320         term.c.hidden = 0;
 321         /* allocate screen */
 322         term.line = calloc(term.row, sizeof(Line));
 323         for(row = 0 ; row < term.row; row++)
 324                 term.line[row] = calloc(term.col, sizeof(Glyph));
 325 }
 326
 327 void
 328 tscroll(void) {
 329         Line temp = term.line[term.top];
 330         int i;
 331         /* X stuff _before_ the line swapping (results in wrong line index) */
 332         xscroll();
 333         for(i = term.top; i < term.bot; i++)
 334                 term.line[i] = term.line[i+1];
 335         memset(temp, 0, sizeof(Glyph) * term.col);
 336         term.line[term.bot] = temp;
 337 }
 338
 339 void
 340 tnewline(void) {
 341         int y = term.c.y + 1;
 342         if(y > term.bot)
 343                 tscroll(), y = term.bot;
 344         tmoveto(0, y);
 345 }
 346
 347 int
 348 escaddc(char c) {
 349         escseq.buf[escseq.len++] = c;
 350         if(escfinal(c) || escseq.len >= ESCSIZ) {
 351                 escparse(), eschandle();
 352                 return 0;
 353         }
 354         return 1;
 355 }
 356
 357 void
 358 escparse(void) {
 359         /* int noarg = 1; */
 360         char *p = escseq.buf;
 361
 362         escseq.narg = 0;
 363         switch(escseq.pre = *p++) {
 364         case '[': /* CSI */
 365                 if(*p == '?')
 366                         escseq.priv = 1, p++;
 367
 368                 while(p < escseq.buf+escseq.len) {
 369                         while(isdigit(*p)) {
 370                                 escseq.arg[escseq.narg] *= 10;
 371                                 escseq.arg[escseq.narg] += *(p++) - '0'/*, noarg = 0 */;
 372                         }
 373                         if(*p == ';')
 374                                 escseq.narg++, p++;
 375                         else {
 376                                 escseq.mode = *p;
 377                                 escseq.narg++;
 378                                 return;
 379                         }
 380                 }
 381                 break;
 382         case '(':
 383                 /* XXX: graphic character set */
 384                 break;
 385         }
 386 }
 387
 388 void
 389 tmoveto(int x, int y) {
 390         term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
 391         term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
 392 }
 393
 394 void
 395 tcursor(int dir) {
 396         int xf = term.c.x, yf = term.c.y;
 397
 398         switch(dir) {
 399         case CSup:
 400                 yf--;
 401                 break;
 402         case CSdown:
 403                 yf++;
 404                 break;
 405         case CSleft:
 406                 xf--;
 407                 if(xf < 0) {
 408                         xf = term.col-1, yf--;
 409                         if(yf < term.top)
 410                                 yf = term.top, xf = 0;
 411                 }
 412                 break;
 413         case CSright:
 414                 xf++;
 415                 if(xf >= term.col) {
 416                         xf = 0, yf++;
 417                         if(yf > term.bot)
 418                                 yf = term.bot, tscroll();
 419                 }
 420                 break;
 421         }
 422         tmoveto(xf, yf);
 423 }
 424
 425 void
 426 tsetchar(char c) {
 427         term.line[term.c.y][term.c.x] = term.c.attr;
 428         term.line[term.c.y][term.c.x].c = c;
 429         term.line[term.c.y][term.c.x].state |= CRset | CRupdate;
 430 }
 431
 432 void
 433 tclearregion(int x1, int y1, int x2, int y2) {
 434         int x, y;
 435
 436         LIMIT(x1, 0, term.col-1);
 437         LIMIT(x2, 0, term.col-1);
 438         LIMIT(y1, 0, term.row-1);
 439         LIMIT(y2, 0, term.row-1);
 440
 441         /* XXX: could be optimized */
 442         for(x = x1; x <= x2; x++)
 443                 for(y = y1; y <= y2; y++)
 444                         memset(&term.line[y][x], 0, sizeof(Glyph));
 445
 446         xclear(x1, y1, x2, y2);
 447 }
 448
 449 void
 450 tdeletechar(int n) {
 451         int src = term.c.x + n;
 452         int dst = term.c.x;
 453         int size = term.col - src;
 454
 455         if(src >= term.col) {
 456                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 457                 return;
 458         }
 459         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 460         tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
 461 }
 462
 463 void
 464 tinsertblank(int n) {
 465         int src = term.c.x;
 466         int dst = src + n;
 467         int size = term.col - n - src;
 468
 469         if(dst >= term.col) {
 470                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 471                 return;
 472         }
 473         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 474         tclearregion(src, term.c.y, dst, term.c.y);
 475 }
 476
 477 void
 478 tsetlinestate(int n, int state) {
 479         int i;
 480         for(i = 0; i < term.col; i++)
 481                 term.line[n][i].state |= state;
 482 }
 483
 484 void
 485 tinsertblankline (int n) {
 486         int i;
 487         Line blank;
 488         int bot = term.bot;
 489
 490         if(term.c.y > term.bot)
 491                 bot = term.row - 1;
 492         else if(term.c.y < term.top)
 493                 bot = term.top - 1;
 494         if(term.c.y + n >= bot) {
 495                 tclearregion(0, term.c.y, term.col-1, bot);
 496                 return;
 497         }
 498         for(i = bot; i >= term.c.y+n; i--) {
 499                 /* swap deleted line <-> blanked line */
 500                 blank = term.line[i];
 501                 term.line[i] = term.line[i-n];
 502                 term.line[i-n] = blank;
 503                 /* blank it */
 504                 memset(blank, 0, term.col * sizeof(Glyph));
 505                 tsetlinestate(i, CRupdate);
 506                 tsetlinestate(i-n, CRupdate);
 507         }
 508 }
 509
 510 void
 511 tdeleteline(int n) {
 512         int i;
 513         Line blank;
 514         int bot = term.bot;
 515
 516         if(term.c.y > term.bot)
 517                 bot = term.row - 1;
 518         else if(term.c.y < term.top)
 519                 bot = term.top - 1;
 520         if(term.c.y + n >= bot) {
 521                 tclearregion(0, term.c.y, term.col-1, bot);
 522                 return;
 523         }
 524         for(i = term.c.y; i <= bot-n; i++) {
 525                 /* swap deleted line <-> blanked line */
 526                 blank = term.line[i];
 527                 term.line[i] = term.line[i+n];
 528                 term.line[i+n] = blank;
 529                 /* blank it */
 530                 memset(blank, 0, term.col * sizeof(Glyph));
 531                 tsetlinestate(i, CRupdate);
 532                 tsetlinestate(i-n, CRupdate);
 533         }
 534 }
 535
 536 void
 537 tsetattr(int *attr, int l) {
 538         int i;
 539
 540         for(i = 0; i < l; i++) {
 541                 switch(attr[i]) {
 542                 case 0:
 543                         memset(&term.c.attr, 0, sizeof(term.c.attr));
 544                         term.c.attr.fg = DefaultFG;
 545                         term.c.attr.bg = DefaultBG;
 546                         break;
 547                 case 1:
 548                         term.c.attr.mode |= ATbold;
 549                         break;
 550                 case 4:
 551                         term.c.attr.mode |= ATunderline;
 552                         break;
 553                 case 7:
 554                         term.c.attr.mode |= ATreverse;
 555                         break;
 556                 case 8:
 557                         term.c.hidden = CShide;
 558                         break;
 559                 case 22:
 560                         term.c.attr.mode &= ~ATbold;
 561                         break;
 562                 case 24:
 563                         term.c.attr.mode &= ~ATunderline;
 564                         break;
 565                 case 27:
 566                         term.c.attr.mode &= ~ATreverse;
 567                         break;
 568                 case 39:
 569                         term.c.attr.fg = DefaultFG;
 570                         break;
 571                 case 49:
 572                         term.c.attr.fg = DefaultBG;
 573                         break;
 574                 default:
 575                         if(BETWEEN(attr[i], 30, 37))
 576                                 term.c.attr.fg = attr[i] - 30;
 577                         else if(BETWEEN(attr[i], 40, 47))
 578                                 term.c.attr.bg = attr[i] - 40;
 579                         break;
 580                 }
 581         }
 582 }
 583
 584 void
 585 tsetscroll(int t, int b) {
 586         int temp;
 587
 588         LIMIT(t, 0, term.row-1);
 589         LIMIT(b, 0, term.row-1);
 590         if(t > b) {
 591                 temp = t;
 592                 t = b;
 593                 b = temp;
 594         }
 595         term.top = t;
 596         term.bot = b;
 597 }
 598
 599 void
 600 eschandle(void) {
 601         switch(escseq.pre) {
 602         default:
 603                 goto unknown_seq;
 604         case '[':
 605                 switch(escseq.mode) {
 606                 default:
 607                 unknown_seq:
 608                         fprintf(stderr, "erresc: unknown sequence\n");
 609                         escdump();
 610                         break;
 611                 case '@': /* Insert <n> blank char */
 612                         DEFAULT(escseq.arg[0], 1);
 613                         tinsertblank(escseq.arg[0]);
 614                         break;
 615                 case 'A': /* Cursor <n> Up */
 616                 case 'e':
 617                         DEFAULT(escseq.arg[0], 1);
 618                         tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 619                         break;
 620                 case 'B': /* Cursor <n> Down */
 621                         DEFAULT(escseq.arg[0], 1);
 622                         tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 623                         break;
 624                 case 'C': /* Cursor <n> Forward */
 625                 case 'a':
 626                         DEFAULT(escseq.arg[0], 1);
 627                         tmoveto(term.c.x+escseq.arg[0], term.c.y);
 628                         break;
 629                 case 'D': /* Cursor <n> Backward */
 630                         DEFAULT(escseq.arg[0], 1);
 631                         tmoveto(term.c.x-escseq.arg[0], term.c.y);
 632                         break;
 633                 case 'E': /* Cursor <n> Down and first col */
 634                         DEFAULT(escseq.arg[0], 1);
 635                         tmoveto(0, term.c.y+escseq.arg[0]);
 636                         break;
 637                 case 'F': /* Cursor <n> Up and first col */
 638                         DEFAULT(escseq.arg[0], 1);
 639                         tmoveto(0, term.c.y-escseq.arg[0]);
 640                         break;
 641                 case 'G': /* Move to <col> */
 642                 case '`':
 643                         DEFAULT(escseq.arg[0], 1);
 644                         tmoveto(escseq.arg[0]-1, term.c.y);
 645                         break;
 646                 case 'H': /* Move to <row> <col> */
 647                 case 'f':
 648                         DEFAULT(escseq.arg[0], 1);
 649                         DEFAULT(escseq.arg[1], 1);
 650                         tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 651                         break;
 652                 case 'J': /* Clear screen */
 653                         switch(escseq.arg[0]) {
 654                         case 0: /* below */
 655                                 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 656                                 break;
 657                         case 1: /* above */
 658                                 tclearregion(0, 0, term.c.x, term.c.y);
 659                                 break;
 660                         case 2: /* all */
 661                                 tclearregion(0, 0, term.col-1, term.row-1);
 662                                 break;
 663                         }
 664                         break;
 665                 case 'K': /* Clear line */
 666                         switch(escseq.arg[0]) {
 667                         case 0: /* right */
 668                                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 669                                 break;
 670                         case 1: /* left */
 671                                 tclearregion(0, term.c.y, term.c.x, term.c.y);
 672                                 break;
 673                         case 2: /* all */
 674                                 tclearregion(0, term.c.y, term.col-1, term.c.y);
 675                                 break;
 676                         }
 677                         break;
 678                 case 'L': /* Insert <n> blank lines */
 679                         DEFAULT(escseq.arg[0], 1);
 680                         tinsertblankline(escseq.arg[0]);
 681                         break;
 682                 case 'l':
 683                         if(escseq.priv && escseq.arg[0] == 25)
 684                                 term.c.hidden = 1;
 685                         break;
 686                 case 'M': /* Delete <n> lines */
 687                         DEFAULT(escseq.arg[0], 1);
 688                         tdeleteline(escseq.arg[0]);
 689                         break;
 690                 case 'P': /* Delete <n> char */
 691                         DEFAULT(escseq.arg[0], 1);
 692                         tdeletechar(escseq.arg[0]);
 693                         break;
 694                 case 'd': /* Move to <row> */
 695                         DEFAULT(escseq.arg[0], 1);
 696                         tmoveto(term.c.x, escseq.arg[0]-1);
 697                         break;
 698                 case 'h': /* Set terminal mode */
 699                         if(escseq.priv && escseq.arg[0] == 25)
 700                                 term.c.hidden = 0;
 701                         break;
 702                 case 'm': /* Terminal attribute (color) */
 703                         tsetattr(escseq.arg, escseq.narg);
 704                         break;
 705                 case 'r':
 706                         if(escseq.priv)
 707                                 ;
 708                         else {
 709                                 DEFAULT(escseq.arg[0], 1);
 710                                 DEFAULT(escseq.arg[1], term.row);
 711                                 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 712                         }
 713                         break;
 714                 case 's': /* Save cursor position */
 715                         tcpos(CSsave);
 716                         break;
 717                 case 'u': /* Load cursor position */
 718                         tcpos(CSload);
 719                         break;
 720                 }
 721                 break;
 722         }
 723 }
 724
 725 void
 726 escdump(void) {
 727         int i;
 728         printf("rawbuf  : %s\n", escseq.buf);
 729         printf("prechar : %c\n", escseq.pre);
 730         printf("private : %c\n", escseq.priv ? '?' : ' ');
 731         printf("narg    : %d\n", escseq.narg);
 732         if(escseq.narg)
 733                 for(i = 0; i < escseq.narg; i++)
 734                         printf("\targ %d = %d\n", i, escseq.arg[i]);
 735         printf("mode    : %c\n", escseq.mode);
 736 }
 737
 738 void
 739 escreset(void) {
 740         memset(&escseq, 0, sizeof(escseq));
 741 }
 742
 743 void
 744 tputtab(void) {
 745         int space = TAB - term.c.x % TAB;
 746
 747         if(term.c.x + space >= term.col)
 748                 space--;
 749
 750         for(; space > 0; space--)
 751                 tcursor(CSright);
 752 }
 753
 754 void
 755 tputc(char c) {
 756         static int inesc = 0;
 757 #if 0
 758         dump(c);
 759 #endif
 760         /* start of escseq */
 761         if(c == '\033')
 762                 escreset(), inesc = 1;
 763         else if(inesc) {
 764                 inesc = escaddc(c);
 765         } /* normal char */
 766         else switch(c) {
 767                 default:
 768                         tsetchar(c);
 769                         tcursor(CSright);
 770                         break;
 771                 case '\t':
 772                         tputtab();
 773                         break;
 774                 case '\b':
 775                         tcursor(CSleft);
 776                         break;
 777                 case '\r':
 778                         tmoveto(0, term.c.y);
 779                         break;
 780                 case '\n':
 781                         tnewline();
 782                         break;
 783                 case '\a':
 784                         xbell();
 785                         break;
 786         }
 787 }
 788
 789 void
 790 tputs(char *s, int len) {
 791         for(; len > 0; len--)
 792                 tputc(*s++);
 793 }
 794
 795 void
 796 tdump(void) {
 797         int row, col;
 798         Glyph c;
 799
 800         for(row = 0; row < term.row; row++) {
 801                 for(col = 0; col < term.col; col++) {
 802                         if(col == term.c.x && row == term.c.y)
 803                                 putchar('#');
 804                         else {
 805                                 c = term.line[row][col];
 806                                 putchar(c.state & CRset ? c.c : '.');
 807                         }
 808                 }
 809                 putchar('\n');
 810         }
 811 }
 812
 813 void
 814 tresize(int col, int row) {
 815         int i;
 816         Line *line;
 817         int minrow = MIN(row, term.row);
 818         int mincol = MIN(col, term.col);
 819
 820         if(col < 1 || row < 1)
 821                 return;
 822         /* alloc */
 823         line = calloc(row, sizeof(Line));
 824         for(i = 0 ; i < row; i++)
 825                 line[i] = calloc(col, sizeof(Glyph));
 826         /* copy */
 827         for(i = 0 ; i < minrow; i++)
 828                 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
 829         /* free */
 830         for(i = 0; i < term.row; i++)
 831                 free(term.line[i]);
 832         free(term.line);
 833
 834         LIMIT(term.c.x, 0, col-1);
 835         LIMIT(term.c.y, 0, row-1);
 836         LIMIT(term.top, 0, row-1);
 837         LIMIT(term.bot, 0, row-1);
 838
 839         term.bot = row-1;
 840         term.line = line;
 841         term.col = col, term.row = row;
 842 }
 843
 844 unsigned long
 845 xgetcol(const char *s) {
 846         XColor color;
 847         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
 848
 849         if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
 850                 color.pixel = WhitePixel(xw.dis, xw.scr);
 851                 fprintf(stderr, "Could not allocate color '%s'\n", s);
 852         }
 853         return color.pixel;
 854 }
 855
 856 void
 857 xclear(int x1, int y1, int x2, int y2) {
 858         XClearArea(xw.dis, xw.win,
 859                         x1 * xw.cw, y1 * xw.ch,
 860                         (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch,
 861                         False);
 862 }
 863
 864 void
 865 xscroll(void) {
 866         int srcy = (term.top+1) * xw.ch;
 867         int dsty = term.top * xw.ch;
 868         int height = (term.bot-term.top) * xw.ch;
 869
 870         xcursor(CShide);
 871         XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
 872         xclear(0, term.bot, term.col-1, term.bot);
 873 }
 874
 875 void
 876 xinit(void) {
 877         XGCValues values;
 878         unsigned long valuemask;
 879         XClassHint chint;
 880         XWMHints wmhint;
 881         XSizeHints shint;
 882         char *args[] = {NULL};
 883         int i;
 884
 885         xw.dis = XOpenDisplay(NULL);
 886         xw.scr = XDefaultScreen(xw.dis);
 887         if(!xw.dis)
 888                 die("Can't open display\n");
 889
 890         /* font */
 891         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)))
 892                 die("Can't load font %s\n", FONT);
 893
 894         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
 895         xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
 896
 897         /* colors */
 898         for(i = 0; i < LEN(colorname); i++)
 899                 dc.col[i] = xgetcol(colorname[i]);
 900
 901         term.c.attr.fg = DefaultFG;
 902         term.c.attr.bg = DefaultBG;
 903         term.c.attr.mode = ATnone;
 904         /* windows */
 905         xw.h = term.row * xw.ch;
 906         xw.w = term.col * xw.cw;
 907         /* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
 908         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
 909                         xw.w, xw.h, BORDER,
 910                         dc.col[DefaultBG],
 911                         dc.col[DefaultBG]);
 912         /* gc */
 913         values.foreground = XWhitePixel(xw.dis, xw.scr);
 914         values.font = dc.font->fid;
 915         valuemask = GCForeground | GCFont;
 916         dc.gc = XCreateGC(xw.dis, xw.win, valuemask, &values);
 917         XMapWindow(xw.dis, xw.win);
 918         /* wm stuff */
 919         chint.res_name = TNAME, chint.res_class = TNAME;
 920         wmhint.input = 1, wmhint.flags = InputHint;
 921         shint.height_inc = xw.ch, shint.width_inc = xw.cw;
 922         shint.height = xw.h, shint.width = xw.w;
 923         shint.flags = PSize | PResizeInc;
 924         XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
 925         XStoreName(xw.dis, xw.win, TNAME);
 926         XSync(xw.dis, 0);
 927 }
 928
 929 void
 930 xdrawc(int x, int y, Glyph g) {
 931         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
 932         unsigned long xfg, xbg;
 933
 934         /* reverse video */
 935         if(g.mode & ATreverse)
 936                 xfg = dc.col[g.bg], xbg = dc.col[g.fg];
 937         else
 938                 xfg = dc.col[g.fg], xbg = dc.col[g.bg];
 939         /* background */
 940         XSetForeground(xw.dis, dc.gc, xbg);
 941         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 942         /* string */
 943         XSetForeground(xw.dis, dc.gc, xfg);
 944         XDrawString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &(g.c), 1);
 945         if(g.mode & ATbold)      /* XXX: bold hack (draw again at x+1) */
 946                 XDrawString(xw.dis, xw.win, dc.gc, r.x+1, r.y+dc.font->ascent, &(g.c), 1);
 947         /* underline */
 948         if(g.mode & ATunderline) {
 949                 r.y += dc.font->ascent + 1;
 950                 XDrawLine(xw.dis, xw.win, dc.gc, r.x, r.y, r.x+r.width-1, r.y);
 951         }
 952 }
 953
 954 void
 955 xcursor(int mode) {
 956         static int oldx = 0;
 957         static int oldy = 0;
 958         Glyph g = {' ', ATnone, DefaultBG, DefaultCS, 0};
 959
 960         LIMIT(oldx, 0, term.col-1);
 961         LIMIT(oldy, 0, term.row-1);
 962
 963         if(term.line[term.c.y][term.c.x].state & CRset)
 964                 g.c = term.line[term.c.y][term.c.x].c;
 965         /* remove the old cursor */
 966         if(term.line[oldy][oldx].state & CRset)
 967                 xdrawc(oldx, oldy, term.line[oldy][oldx]);
 968         else
 969                 xclear(oldx, oldy, oldx, oldy);
 970         /* draw the new one */
 971         if(mode == CSdraw) {
 972                 xdrawc(term.c.x, term.c.y, g);
 973                 oldx = term.c.x, oldy = term.c.y;
 974         }
 975 }
 976
 977 void
 978 draw(int redraw_all) {
 979         int x, y;
 980         int changed, set;
 981
 982         if(redraw_all)
 983                 XClearWindow(xw.dis, xw.win);
 984
 985         /* XXX: drawing could be optimised */
 986         for(y = 0; y < term.row; y++) {
 987                 for(x = 0; x < term.col; x++) {
 988                         changed = term.line[y][x].state & CRupdate;
 989                         set = term.line[y][x].state & CRset;
 990                         if(redraw_all || changed) {
 991                                 term.line[y][x].state &= ~CRupdate;
 992                                 if(set)
 993                                         xdrawc(x, y, term.line[y][x]);
 994                                 else
 995                                         xclear(x, y, x, y);
 996                         }
 997                 }
 998         }
 999         xcursor(CSdraw);
1000 }
1001
1002 char*
1003 kmap(KeySym k) {
1004         int i;
1005         for(i = 0; i < LEN(key); i++)
1006                 if(key[i].k == k)
1007                         return (char*)key[i].s;
1008         return NULL;
1009 }
1010
1011 void
1012 kpress(XKeyEvent *e) {
1013         KeySym ksym;
1014         char buf[32];
1015         int len;
1016         int meta;
1017         int shift;
1018         char* skmap;
1019
1020         meta  = e->state & Mod1Mask;
1021         shift = e->state & ShiftMask;
1022         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1023         if(skmap = kmap(ksym))
1024                 ttywrite(skmap, strlen(skmap));
1025         else if(len > 0) {
1026                 buf[sizeof(buf)-1] = '\0';
1027                 if(meta && len == 1)
1028                         ttywrite("\033", 1);
1029                 ttywrite(buf, len);
1030         } else
1031                 switch(ksym) {
1032                 case XK_Insert:
1033                         if(shift)
1034                                 /* XXX: paste X clipboard */;
1035                         break;
1036                 default:
1037                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1038                         break;
1039                 }
1040 }
1041
1042 void
1043 resize(XEvent *e) {
1044         int col, row;
1045         col = e->xconfigure.width / xw.cw;
1046         row = e->xconfigure.height / xw.ch;
1047
1048         if(term.col != col || term.row != row) {
1049                 tresize(col, row);
1050                 ttyresize(col, row);
1051                 xw.w = e->xconfigure.width;
1052                 xw.h = e->xconfigure.height;
1053                 draw(SCredraw);
1054         }
1055 }
1056
1057 void
1058 run(void) {
1059         int ret;
1060         XEvent ev;
1061         fd_set rfd;
1062         int xfd = XConnectionNumber(xw.dis);
1063
1064         running = 1;
1065         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1066         XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
1067
1068         while(running) {
1069                 FD_ZERO(&rfd);
1070                 FD_SET(cmdfd, &rfd);
1071                 FD_SET(xfd, &rfd);
1072                 XFlush(xw.dis);
1073                 ret = select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL);
1074
1075                 if(ret < 0)
1076                         die("select failed: %s\n", SERRNO);
1077
1078                 if(FD_ISSET(xfd, &rfd)) {
1079                         while(XPending(xw.dis)) {
1080                                 XNextEvent(xw.dis, &ev);
1081                                 switch (ev.type) {
1082                                 default:
1083                                         break;
1084                                 case KeyPress:
1085                                         kpress(&ev.xkey);
1086                                         break;
1087                                 case Expose:
1088                                         draw(SCredraw);
1089                                         break;
1090                                 case ConfigureNotify:
1091                                         resize(&ev);
1092                                         break;
1093                                 }
1094                         }
1095                 }
1096                 if(FD_ISSET(cmdfd, &rfd)) {
1097                         ttyread();
1098                         draw(SCupdate);
1099                 }
1100         }
1101 }
1102
1103 int
1104 main(int argc, char *argv[]) {
1105         if(argc == 2 && !strncmp("-v", argv[1], 3))
1106                 die("st-" VERSION ", © 2009 st engineers\n");
1107         else if(argc != 1)
1108                 die("usage: st [-v]\n");
1109         setlocale(LC_CTYPE, "");
1110         tnew(80, 24);
1111         ttynew();
1112         xinit();
1113         run();
1114         return 0;
1115 }