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