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