st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <signal.h>
  13 #include <sys/ioctl.h>
  14 #include <sys/select.h>
  15 #include <sys/stat.h>
  16 #include <sys/types.h>
  17 #include <sys/wait.h>
  18 #include <unistd.h>
  19 #include <X11/Xlib.h>
  20 #include <X11/keysym.h>
  21 #include <X11/Xutil.h>
  22
  23 #define TNAME "st"
  24
  25 /* Arbitrary sizes */
  26 #define ESCSIZ 256
  27 #define ESCARG 16
  28 #define MAXDRAWBUF 1024
  29
  30 #define SERRNO strerror(errno)
  31 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  32 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  33 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  34 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  35 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  36 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  37 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  38
  39 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  40 enum { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4 };
  41 enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSwrap, CSsave, CSload };
  42 enum { CRset=1, CRupdate=2 };
  43 enum { TMwrap=1, TMinsert=2 };
  44 enum { SCupdate, SCredraw };
  45
  46 typedef int Color;
  47
  48 typedef struct {
  49         char c;     /* character code  */
  50         char mode;  /* attribute flags */
  51         Color fg;   /* foreground      */
  52         Color bg;   /* background      */
  53         char state; /* state flag      */
  54 } Glyph;
  55
  56 typedef Glyph* Line;
  57
  58 typedef struct {
  59         Glyph attr;  /* current char attributes */
  60         char hidden;
  61         int x;
  62         int y;
  63 } TCursor;
  64
  65 /* Escape sequence structs */
  66 /* ESC <pre> [[ [<priv>] <arg> [;]] <mode>] */
  67 typedef struct {
  68         char buf[ESCSIZ+1]; /* raw string */
  69         int len;            /* raw string length */
  70         char pre;
  71         char priv;
  72         int arg[ESCARG+1];
  73         int narg;           /* nb of args */
  74         char mode;
  75 } Escseq;
  76
  77 /* Internal representation of the screen */
  78 typedef struct {
  79         int row;    /* nb row */
  80         int col;    /* nb col */
  81         Line* line; /* screen */
  82         TCursor c;  /* cursor */
  83         int top;    /* top    scroll limit */
  84         int bot;    /* bottom scroll limit */
  85         int mode;   /* terminal mode */
  86 } Term;
  87
  88 /* Purely graphic info */
  89 typedef struct {
  90         Display* dis;
  91         Window win;
  92         int scr;
  93         int w;  /* window width  */
  94         int h;  /* window height */
  95         int ch; /* char height */
  96         int cw; /* char width  */
  97 } XWindow;
  98
  99 typedef struct {
 100         KeySym k;
 101         char s[ESCSIZ];
 102 } Key;
 103
 104 #include "config.h"
 105
 106 /* Drawing Context */
 107 typedef struct {
 108         unsigned long col[LEN(colorname)];
 109         XFontStruct* font;
 110         GC gc;
 111 } DC;
 112
 113 static void die(const char *errstr, ...);
 114 static void draw(int);
 115 static void execsh(void);
 116 static void sigchld(int);
 117 static void run(void);
 118
 119 static int escaddc(char);
 120 static int escfinal(char);
 121 static void escdump(void);
 122 static void eschandle(void);
 123 static void escparse(void);
 124 static void escreset(void);
 125
 126 static void tclearregion(int, int, int, int);
 127 static void tcpos(int);
 128 static void tcursor(int);
 129 static void tdeletechar(int);
 130 static void tdeleteline(int);
 131 static void tinsertblank(int);
 132 static void tinsertblankline(int);
 133 static void tmoveto(int, int);
 134 static void tnew(int, int);
 135 static void tnewline(void);
 136 static void tputc(char);
 137 static void tputs(char*, int);
 138 static void tresize(int, int);
 139 static void tscroll(void);
 140 static void tsetattr(int*, int);
 141 static void tsetchar(char);
 142 static void tsetscroll(int, int);
 143
 144 static void ttynew(void);
 145 static void ttyread(void);
 146 static void ttyresize(int, int);
 147 static void ttywrite(const char *, size_t);
 148
 149 static unsigned long xgetcol(const char *);
 150 static void xclear(int, int, int, int);
 151 static void xcursor(int);
 152 static void xdrawc(int, int, Glyph);
 153 static void xinit(void);
 154 static void xscroll(void);
 155
 156 static void expose(XEvent *);
 157 static char * kmap(KeySym);
 158 static void kpress(XEvent *);
 159 static void resize(XEvent *);
 160
 161 static void (*handler[LASTEvent])(XEvent *) = {
 162         [KeyPress] = kpress,
 163         [Expose] = expose,
 164         [ConfigureNotify] = resize
 165 };
 166
 167 /* Globals */
 168 static DC dc;
 169 static XWindow xw;
 170 static Term term;
 171 static Escseq escseq;
 172 static int cmdfd;
 173 static pid_t pid;
 174 static int running;
 175
 176 #ifdef DEBUG
 177 void
 178 tdump(void) {
 179         int row, col;
 180         Glyph c;
 181
 182         for(row = 0; row < term.row; row++) {
 183                 for(col = 0; col < term.col; col++) {
 184                         if(col == term.c.x && row == term.c.y)
 185                                 putchar('#');
 186                         else {
 187                                 c = term.line[row][col];
 188                                 putchar(c.state & CRset ? c.c : '.');
 189                         }
 190                 }
 191                 putchar('\n');
 192         }
 193 }
 194 #endif
 195
 196 void
 197 die(const char *errstr, ...) {
 198         va_list ap;
 199
 200         va_start(ap, errstr);
 201         vfprintf(stderr, errstr, ap);
 202         va_end(ap);
 203         exit(EXIT_FAILURE);
 204 }
 205
 206 void
 207 execsh(void) {
 208         char *args[3] = {SHELL, "-i", NULL};
 209         putenv("TERM=" TNAME);
 210         execvp(SHELL, args);
 211 }
 212
 213 void
 214 xbell(void) { /* visual bell */
 215         XRectangle r = { 0, 0, xw.w, xw.h };
 216         XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
 217         XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
 218         /* usleep(30000); */
 219         draw(SCredraw);
 220 }
 221
 222 void
 223 sigchld(int a) {
 224         int stat = 0;
 225         if(waitpid(pid, &stat, 0) < 0)
 226                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 227         if(WIFEXITED(stat))
 228                 exit(WEXITSTATUS(stat));
 229         else
 230                 exit(EXIT_FAILURE);
 231 }
 232
 233 void
 234 ttynew(void) {
 235         int m, s;
 236         char *pts;
 237
 238         if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
 239                 die("openpt failed: %s\n", SERRNO);
 240         if(grantpt(m) < 0)
 241                 die("grandpt failed: %s\n", SERRNO);
 242         if(unlockpt(m) < 0)
 243                 die("unlockpt failed: %s\n", SERRNO);
 244         if(!(pts = ptsname(m)))
 245                 die("ptsname failed: %s\n", SERRNO);
 246         if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
 247                 die("Couldn't open slave: %s\n", SERRNO);
 248         fcntl(s, F_SETFL, O_NDELAY);
 249         switch(pid = fork()) {
 250         case -1:
 251                 die("fork failed\n");
 252                 break;
 253         case 0:
 254                 setsid(); /* create a new process group */
 255                 dup2(s, STDIN_FILENO);
 256                 dup2(s, STDOUT_FILENO);
 257                 dup2(s, STDERR_FILENO);
 258                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 259                         die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
 260                 execsh();
 261                 break;
 262         default:
 263                 close(s);
 264                 cmdfd = m;
 265                 signal(SIGCHLD, sigchld);
 266         }
 267 }
 268
 269 void
 270 dump(char c) {
 271         static int col;
 272         fprintf(stderr, " %02x %c ", c, isprint(c)?c:'.');
 273         if(++col % 10 == 0)
 274                 fprintf(stderr, "\n");
 275 }
 276
 277 void
 278 ttyread(void) {
 279         char buf[BUFSIZ] = {0};
 280         int ret;
 281
 282         switch(ret = read(cmdfd, buf, BUFSIZ)) {
 283         case -1:
 284                 die("Couldn't read from shell: %s\n", SERRNO);
 285                 break;
 286         default:
 287                 tputs(buf, ret);
 288         }
 289 }
 290
 291 void
 292 ttywrite(const char *s, size_t n) {
 293         if(write(cmdfd, s, n) == -1)
 294                 die("write error on tty: %s\n", SERRNO);
 295 }
 296
 297 void
 298 ttyresize(int x, int y) {
 299         struct winsize w;
 300
 301         w.ws_row = term.row;
 302         w.ws_col = term.col;
 303         w.ws_xpixel = w.ws_ypixel = 0;
 304         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 305                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 306 }
 307
 308 int
 309 escfinal(char c) {
 310         if(escseq.len == 1)
 311                 switch(c) {
 312                 case '[':
 313                 case ']':
 314                 case '(':
 315                         return 0;
 316                 case '=':
 317                 case '>':
 318                 default:
 319                         return 1;
 320                 }
 321         else if(BETWEEN(c, 0x40, 0x7E))
 322                 return 1;
 323         return 0;
 324 }
 325
 326 void
 327 tcpos(int mode) {
 328         static int x = 0;
 329         static int y = 0;
 330
 331         if(mode == CSsave)
 332                 x = term.c.x, y = term.c.y;
 333         else if(mode == CSload)
 334                 tmoveto(x, y);
 335 }
 336
 337 void
 338 tnew(int col, int row) {   /* screen size */
 339         term.row = row, term.col = col;
 340         term.top = 0, term.bot = term.row - 1;
 341         /* mode */
 342         term.mode = TMwrap;
 343         /* cursor */
 344         term.c.attr.mode = ATnone;
 345         term.c.attr.fg = DefaultFG;
 346         term.c.attr.bg = DefaultBG;
 347         term.c.x = term.c.y = 0;
 348         term.c.hidden = 0;
 349         /* allocate screen */
 350         term.line = calloc(term.row, sizeof(Line));
 351         for(row = 0 ; row < term.row; row++)
 352                 term.line[row] = calloc(term.col, sizeof(Glyph));
 353 }
 354
 355 void
 356 tscroll(void) {
 357         Line temp = term.line[term.top];
 358         int i;
 359         /* X stuff _before_ the line swapping (results in wrong line index) */
 360         xscroll();
 361         for(i = term.top; i < term.bot; i++)
 362                 term.line[i] = term.line[i+1];
 363         memset(temp, 0, sizeof(Glyph) * term.col);
 364         term.line[term.bot] = temp;
 365 }
 366
 367 void
 368 tnewline(void) {
 369         int y = term.c.y + 1;
 370         if(y > term.bot)
 371                 tscroll(), y = term.bot;
 372         tmoveto(0, y);
 373 }
 374
 375 int
 376 escaddc(char c) {
 377         escseq.buf[escseq.len++] = c;
 378         if(escfinal(c) || escseq.len >= ESCSIZ) {
 379                 escparse(), eschandle();
 380                 return 0;
 381         }
 382         return 1;
 383 }
 384
 385 void
 386 escparse(void) {
 387         /* int noarg = 1; */
 388         char *p = escseq.buf;
 389
 390         escseq.narg = 0;
 391         switch(escseq.pre = *p++) {
 392         case '[': /* CSI */
 393                 if(*p == '?')
 394                         escseq.priv = 1, p++;
 395
 396                 while(p < escseq.buf+escseq.len) {
 397                         while(isdigit(*p)) {
 398                                 escseq.arg[escseq.narg] *= 10;
 399                                 escseq.arg[escseq.narg] += *(p++) - '0'/*, noarg = 0 */;
 400                         }
 401                         if(*p == ';')
 402                                 escseq.narg++, p++;
 403                         else {
 404                                 escseq.mode = *p;
 405                                 escseq.narg++;
 406                                 return;
 407                         }
 408                 }
 409                 break;
 410         case '(':
 411                 /* XXX: graphic character set */
 412                 break;
 413         }
 414 }
 415
 416 void
 417 tmoveto(int x, int y) {
 418         term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
 419         term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
 420 }
 421
 422 void
 423 tcursor(int dir) {
 424         int xf = term.c.x, yf = term.c.y;
 425
 426         switch(dir) {
 427         case CSup:
 428                 yf--;
 429                 break;
 430         case CSdown:
 431                 yf++;
 432                 break;
 433         case CSleft:
 434                 xf--;
 435                 if(xf < 0) {
 436                         xf = term.col-1, yf--;
 437                         if(yf < term.top)
 438                                 yf = term.top, xf = 0;
 439                 }
 440                 break;
 441         case CSright:
 442                 xf++;
 443                 if(xf >= term.col) {
 444                         xf = 0, yf++;
 445                         if(yf > term.bot)
 446                                 yf = term.bot, tscroll();
 447                 }
 448                 break;
 449         }
 450         tmoveto(xf, yf);
 451 }
 452
 453 void
 454 tsetchar(char c) {
 455         term.line[term.c.y][term.c.x] = term.c.attr;
 456         term.line[term.c.y][term.c.x].c = c;
 457         term.line[term.c.y][term.c.x].state |= CRset | CRupdate;
 458 }
 459
 460 void
 461 tclearregion(int x1, int y1, int x2, int y2) {
 462         int x, y;
 463
 464         LIMIT(x1, 0, term.col-1);
 465         LIMIT(x2, 0, term.col-1);
 466         LIMIT(y1, 0, term.row-1);
 467         LIMIT(y2, 0, term.row-1);
 468
 469         /* XXX: could be optimized */
 470         for(x = x1; x <= x2; x++)
 471                 for(y = y1; y <= y2; y++)
 472                         memset(&term.line[y][x], 0, sizeof(Glyph));
 473
 474         xclear(x1, y1, x2, y2);
 475 }
 476
 477 void
 478 tdeletechar(int n) {
 479         int src = term.c.x + n;
 480         int dst = term.c.x;
 481         int size = term.col - src;
 482
 483         if(src >= term.col) {
 484                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 485                 return;
 486         }
 487         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 488         tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
 489 }
 490
 491 void
 492 tinsertblank(int n) {
 493         int src = term.c.x;
 494         int dst = src + n;
 495         int size = term.col - n - src;
 496
 497         if(dst >= term.col) {
 498                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 499                 return;
 500         }
 501         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 502         tclearregion(src, term.c.y, dst, term.c.y);
 503 }
 504
 505 void
 506 tsetlinestate(int n, int state) {
 507         int i;
 508         for(i = 0; i < term.col; i++)
 509                 term.line[n][i].state |= state;
 510 }
 511
 512 void
 513 tinsertblankline (int n) {
 514         int i;
 515         Line blank;
 516         int bot = term.bot;
 517
 518         if(term.c.y > term.bot)
 519                 bot = term.row - 1;
 520         else if(term.c.y < term.top)
 521                 bot = term.top - 1;
 522         if(term.c.y + n >= bot) {
 523                 tclearregion(0, term.c.y, term.col-1, bot);
 524                 return;
 525         }
 526         for(i = bot; i >= term.c.y+n; i--) {
 527                 /* swap deleted line <-> blanked line */
 528                 blank = term.line[i];
 529                 term.line[i] = term.line[i-n];
 530                 term.line[i-n] = blank;
 531                 /* blank it */
 532                 memset(blank, 0, term.col * sizeof(Glyph));
 533                 tsetlinestate(i, CRupdate);
 534                 tsetlinestate(i-n, CRupdate);
 535         }
 536 }
 537
 538 void
 539 tdeleteline(int n) {
 540         int i;
 541         Line blank;
 542         int bot = term.bot;
 543
 544         if(term.c.y > term.bot)
 545                 bot = term.row - 1;
 546         else if(term.c.y < term.top)
 547                 bot = term.top - 1;
 548         if(term.c.y + n >= bot) {
 549                 tclearregion(0, term.c.y, term.col-1, bot);
 550                 return;
 551         }
 552         for(i = term.c.y; i <= bot-n; i++) {
 553                 /* swap deleted line <-> blanked line */
 554                 blank = term.line[i];
 555                 term.line[i] = term.line[i+n];
 556                 term.line[i+n] = blank;
 557                 /* blank it */
 558                 memset(blank, 0, term.col * sizeof(Glyph));
 559                 tsetlinestate(i, CRupdate);
 560                 tsetlinestate(i-n, CRupdate);
 561         }
 562 }
 563
 564 void
 565 tsetattr(int *attr, int l) {
 566         int i;
 567
 568         for(i = 0; i < l; i++) {
 569                 switch(attr[i]) {
 570                 case 0:
 571                         memset(&term.c.attr, 0, sizeof(term.c.attr));
 572                         term.c.attr.fg = DefaultFG;
 573                         term.c.attr.bg = DefaultBG;
 574                         break;
 575                 case 1:
 576                         term.c.attr.mode |= ATbold;
 577                         break;
 578                 case 4:
 579                         term.c.attr.mode |= ATunderline;
 580                         break;
 581                 case 7:
 582                         term.c.attr.mode |= ATreverse;
 583                         break;
 584                 case 8:
 585                         term.c.hidden = CShide;
 586                         break;
 587                 case 22:
 588                         term.c.attr.mode &= ~ATbold;
 589                         break;
 590                 case 24:
 591                         term.c.attr.mode &= ~ATunderline;
 592                         break;
 593                 case 27:
 594                         term.c.attr.mode &= ~ATreverse;
 595                         break;
 596                 case 39:
 597                         term.c.attr.fg = DefaultFG;
 598                         break;
 599                 case 49:
 600                         term.c.attr.fg = DefaultBG;
 601                         break;
 602                 default:
 603                         if(BETWEEN(attr[i], 30, 37))
 604                                 term.c.attr.fg = attr[i] - 30;
 605                         else if(BETWEEN(attr[i], 40, 47))
 606                                 term.c.attr.bg = attr[i] - 40;
 607                         break;
 608                 }
 609         }
 610 }
 611
 612 void
 613 tsetscroll(int t, int b) {
 614         int temp;
 615
 616         LIMIT(t, 0, term.row-1);
 617         LIMIT(b, 0, term.row-1);
 618         if(t > b) {
 619                 temp = t;
 620                 t = b;
 621                 b = temp;
 622         }
 623         term.top = t;
 624         term.bot = b;
 625 }
 626
 627 void
 628 eschandle(void) {
 629         switch(escseq.pre) {
 630         default:
 631                 goto unknown_seq;
 632         case '[':
 633                 switch(escseq.mode) {
 634                 default:
 635                 unknown_seq:
 636                         fprintf(stderr, "erresc: unknown sequence\n");
 637                         escdump();
 638                         break;
 639                 case '@': /* Insert <n> blank char */
 640                         DEFAULT(escseq.arg[0], 1);
 641                         tinsertblank(escseq.arg[0]);
 642                         break;
 643                 case 'A': /* Cursor <n> Up */
 644                 case 'e':
 645                         DEFAULT(escseq.arg[0], 1);
 646                         tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 647                         break;
 648                 case 'B': /* Cursor <n> Down */
 649                         DEFAULT(escseq.arg[0], 1);
 650                         tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 651                         break;
 652                 case 'C': /* Cursor <n> Forward */
 653                 case 'a':
 654                         DEFAULT(escseq.arg[0], 1);
 655                         tmoveto(term.c.x+escseq.arg[0], term.c.y);
 656                         break;
 657                 case 'D': /* Cursor <n> Backward */
 658                         DEFAULT(escseq.arg[0], 1);
 659                         tmoveto(term.c.x-escseq.arg[0], term.c.y);
 660                         break;
 661                 case 'E': /* Cursor <n> Down and first col */
 662                         DEFAULT(escseq.arg[0], 1);
 663                         tmoveto(0, term.c.y+escseq.arg[0]);
 664                         break;
 665                 case 'F': /* Cursor <n> Up and first col */
 666                         DEFAULT(escseq.arg[0], 1);
 667                         tmoveto(0, term.c.y-escseq.arg[0]);
 668                         break;
 669                 case 'G': /* Move to <col> */
 670                 case '`':
 671                         DEFAULT(escseq.arg[0], 1);
 672                         tmoveto(escseq.arg[0]-1, term.c.y);
 673                         break;
 674                 case 'H': /* Move to <row> <col> */
 675                 case 'f':
 676                         DEFAULT(escseq.arg[0], 1);
 677                         DEFAULT(escseq.arg[1], 1);
 678                         tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 679                         break;
 680                 case 'J': /* Clear screen */
 681                         switch(escseq.arg[0]) {
 682                         case 0: /* below */
 683                                 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 684                                 break;
 685                         case 1: /* above */
 686                                 tclearregion(0, 0, term.c.x, term.c.y);
 687                                 break;
 688                         case 2: /* all */
 689                                 tclearregion(0, 0, term.col-1, term.row-1);
 690                                 break;
 691                         }
 692                         break;
 693                 case 'K': /* Clear line */
 694                         switch(escseq.arg[0]) {
 695                         case 0: /* right */
 696                                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 697                                 break;
 698                         case 1: /* left */
 699                                 tclearregion(0, term.c.y, term.c.x, term.c.y);
 700                                 break;
 701                         case 2: /* all */
 702                                 tclearregion(0, term.c.y, term.col-1, term.c.y);
 703                                 break;
 704                         }
 705                         break;
 706                 case 'L': /* Insert <n> blank lines */
 707                         DEFAULT(escseq.arg[0], 1);
 708                         tinsertblankline(escseq.arg[0]);
 709                         break;
 710                 case 'l':
 711                         if(escseq.priv && escseq.arg[0] == 25)
 712                                 term.c.hidden = 1;
 713                         break;
 714                 case 'M': /* Delete <n> lines */
 715                         DEFAULT(escseq.arg[0], 1);
 716                         tdeleteline(escseq.arg[0]);
 717                         break;
 718                 case 'P': /* Delete <n> char */
 719                         DEFAULT(escseq.arg[0], 1);
 720                         tdeletechar(escseq.arg[0]);
 721                         break;
 722                 case 'd': /* Move to <row> */
 723                         DEFAULT(escseq.arg[0], 1);
 724                         tmoveto(term.c.x, escseq.arg[0]-1);
 725                         break;
 726                 case 'h': /* Set terminal mode */
 727                         if(escseq.priv && escseq.arg[0] == 25)
 728                                 term.c.hidden = 0;
 729                         break;
 730                 case 'm': /* Terminal attribute (color) */
 731                         tsetattr(escseq.arg, escseq.narg);
 732                         break;
 733                 case 'r':
 734                         if(escseq.priv)
 735                                 ;
 736                         else {
 737                                 DEFAULT(escseq.arg[0], 1);
 738                                 DEFAULT(escseq.arg[1], term.row);
 739                                 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 740                         }
 741                         break;
 742                 case 's': /* Save cursor position */
 743                         tcpos(CSsave);
 744                         break;
 745                 case 'u': /* Load cursor position */
 746                         tcpos(CSload);
 747                         break;
 748                 }
 749                 break;
 750         }
 751 }
 752
 753 void
 754 escdump(void) {
 755         int i;
 756         printf("rawbuf  : %s\n", escseq.buf);
 757         printf("prechar : %c\n", escseq.pre);
 758         printf("private : %c\n", escseq.priv ? '?' : ' ');
 759         printf("narg    : %d\n", escseq.narg);
 760         if(escseq.narg)
 761                 for(i = 0; i < escseq.narg; i++)
 762                         printf("\targ %d = %d\n", i, escseq.arg[i]);
 763         printf("mode    : %c\n", escseq.mode);
 764 }
 765
 766 void
 767 escreset(void) {
 768         memset(&escseq, 0, sizeof(escseq));
 769 }
 770
 771 void
 772 tputtab(void) {
 773         int space = TAB - term.c.x % TAB;
 774
 775         if(term.c.x + space >= term.col)
 776                 space--;
 777
 778         for(; space > 0; space--)
 779                 tcursor(CSright);
 780 }
 781
 782 void
 783 tputc(char c) {
 784         static int inesc = 0;
 785 #if 0
 786         dump(c);
 787 #endif
 788         /* start of escseq */
 789         if(c == '\033')
 790                 escreset(), inesc = 1;
 791         else if(inesc) {
 792                 inesc = escaddc(c);
 793         } /* normal char */
 794         else switch(c) {
 795                 default:
 796                         tsetchar(c);
 797                         tcursor(CSright);
 798                         break;
 799                 case '\t':
 800                         tputtab();
 801                         break;
 802                 case '\b':
 803                         tcursor(CSleft);
 804                         break;
 805                 case '\r':
 806                         tmoveto(0, term.c.y);
 807                         break;
 808                 case '\n':
 809                         tnewline();
 810                         break;
 811                 case '\a':
 812                         xbell();
 813                         break;
 814         }
 815 }
 816
 817 void
 818 tputs(char *s, int len) {
 819         for(; len > 0; len--)
 820                 tputc(*s++);
 821 }
 822
 823 void
 824 tresize(int col, int row) {
 825         int i;
 826         Line *line;
 827         int minrow = MIN(row, term.row);
 828         int mincol = MIN(col, term.col);
 829
 830         if(col < 1 || row < 1)
 831                 return;
 832         /* alloc */
 833         line = calloc(row, sizeof(Line));
 834         for(i = 0 ; i < row; i++)
 835                 line[i] = calloc(col, sizeof(Glyph));
 836         /* copy */
 837         for(i = 0 ; i < minrow; i++)
 838                 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
 839         /* free */
 840         for(i = 0; i < term.row; i++)
 841                 free(term.line[i]);
 842         free(term.line);
 843
 844         LIMIT(term.c.x, 0, col-1);
 845         LIMIT(term.c.y, 0, row-1);
 846         LIMIT(term.top, 0, row-1);
 847         LIMIT(term.bot, 0, row-1);
 848
 849         term.bot = row-1;
 850         term.line = line;
 851         term.col = col, term.row = row;
 852 }
 853
 854 unsigned long
 855 xgetcol(const char *s) {
 856         XColor color;
 857         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
 858
 859         if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
 860                 color.pixel = WhitePixel(xw.dis, xw.scr);
 861                 fprintf(stderr, "Could not allocate color '%s'\n", s);
 862         }
 863         return color.pixel;
 864 }
 865
 866 void
 867 xclear(int x1, int y1, int x2, int y2) {
 868         XClearArea(xw.dis, xw.win,
 869                         x1 * xw.cw, y1 * xw.ch,
 870                         (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch,
 871                         False);
 872 }
 873
 874 void
 875 xscroll(void) {
 876         int srcy = (term.top+1) * xw.ch;
 877         int dsty = term.top * xw.ch;
 878         int height = (term.bot-term.top) * xw.ch;
 879
 880         xcursor(CShide);
 881         XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
 882         xclear(0, term.bot, term.col-1, term.bot);
 883 }
 884
 885 void
 886 xinit(void) {
 887         XGCValues values;
 888         unsigned long valuemask;
 889         XClassHint chint;
 890         XWMHints wmhint;
 891         XSizeHints shint;
 892         char *args[] = {NULL};
 893         int i;
 894
 895         xw.dis = XOpenDisplay(NULL);
 896         xw.scr = XDefaultScreen(xw.dis);
 897         if(!xw.dis)
 898                 die("Can't open display\n");
 899
 900         /* font */
 901         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)))
 902                 die("Can't load font %s\n", FONT);
 903
 904         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
 905         xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
 906
 907         /* colors */
 908         for(i = 0; i < LEN(colorname); i++)
 909                 dc.col[i] = xgetcol(colorname[i]);
 910
 911         term.c.attr.fg = DefaultFG;
 912         term.c.attr.bg = DefaultBG;
 913         term.c.attr.mode = ATnone;
 914         /* windows */
 915         xw.h = term.row * xw.ch;
 916         xw.w = term.col * xw.cw;
 917         /* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
 918         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
 919                         xw.w, xw.h, BORDER,
 920                         dc.col[DefaultBG],
 921                         dc.col[DefaultBG]);
 922         /* gc */
 923         values.foreground = XWhitePixel(xw.dis, xw.scr);
 924         values.font = dc.font->fid;
 925         valuemask = GCForeground | GCFont;
 926         dc.gc = XCreateGC(xw.dis, xw.win, valuemask, &values);
 927         XMapWindow(xw.dis, xw.win);
 928         /* wm stuff */
 929         chint.res_name = TNAME, chint.res_class = TNAME;
 930         wmhint.input = 1, wmhint.flags = InputHint;
 931         shint.height_inc = xw.ch, shint.width_inc = xw.cw;
 932         shint.height = xw.h, shint.width = xw.w;
 933         shint.flags = PSize | PResizeInc;
 934         XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
 935         XStoreName(xw.dis, xw.win, TNAME);
 936         XSync(xw.dis, 0);
 937 }
 938
 939 void
 940 xdraws (char *s, Glyph base, int x, int y, int len) {
 941         unsigned long xfg, xbg;
 942         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
 943         if(base.mode & ATreverse)
 944                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
 945         else
 946                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
 947
 948         XSetBackground(xw.dis, dc.gc, xbg);
 949         XSetForeground(xw.dis, dc.gc, xfg);
 950         XDrawImageString(xw.dis, xw.win, dc.gc, winx, winy, s, len);
 951
 952         if(base.mode & ATunderline)
 953                 XDrawLine(xw.dis, xw.win, dc.gc, winx, winy+1, winx+width-1, winy+1);
 954 }
 955
 956 void
 957 xdrawc(int x, int y, Glyph g) {
 958         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
 959         unsigned long xfg, xbg;
 960
 961         /* reverse video */
 962         if(g.mode & ATreverse)
 963                 xfg = dc.col[g.bg], xbg = dc.col[g.fg];
 964         else
 965                 xfg = dc.col[g.fg], xbg = dc.col[g.bg];
 966         /* background */
 967         XSetBackground(xw.dis, dc.gc, xbg);
 968         XSetForeground(xw.dis, dc.gc, xfg);
 969         XDrawImageString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
 970 }
 971
 972 void
 973 xcursor(int mode) {
 974         static int oldx = 0;
 975         static int oldy = 0;
 976         Glyph g = {' ', ATnone, DefaultBG, DefaultCS, 0};
 977
 978         LIMIT(oldx, 0, term.col-1);
 979         LIMIT(oldy, 0, term.row-1);
 980
 981         if(term.line[term.c.y][term.c.x].state & CRset)
 982                 g.c = term.line[term.c.y][term.c.x].c;
 983         /* remove the old cursor */
 984         if(term.line[oldy][oldx].state & CRset)
 985                 xdrawc(oldx, oldy, term.line[oldy][oldx]);
 986         else
 987                 xclear(oldx, oldy, oldx, oldy);
 988         /* draw the new one */
 989         if(mode == CSdraw) {
 990                 xdrawc(term.c.x, term.c.y, g);
 991                 oldx = term.c.x, oldy = term.c.y;
 992         }
 993 }
 994
 995 void
 996 draw(int redraw_all) {
 997         int i, x, y, ox;
 998         Glyph base, new;
 999         char buf[MAXDRAWBUF];
1000
1001         for(y = 0; y < term.row; y++) {
1002                 base = term.line[y][0];
1003                 i = ox = 0;
1004                 for(x = 0; x < term.col; x++) {
1005                         new = term.line[y][x];
1006                         if(!ATTRCMP(base, new) && i < MAXDRAWBUF)
1007                                 buf[i++] = new.c;
1008                         else {
1009                                 xdraws(buf, base, ox, y, i);
1010                                 buf[0] = new.c;
1011                                 i = 1;
1012                                 ox = x;
1013                                 base = new;
1014                         }
1015                 }
1016                 xdraws(buf, base, ox, y, i);
1017         }
1018         xcursor(CSdraw);
1019 }
1020
1021 void
1022 expose(XEvent *ev) {
1023         draw(SCredraw);
1024 }
1025
1026 char *
1027 kmap(KeySym k) {
1028         int i;
1029         for(i = 0; i < LEN(key); i++)
1030                 if(key[i].k == k)
1031                         return (char*)key[i].s;
1032         return NULL;
1033 }
1034
1035 void
1036 kpress(XEvent *ev) {
1037         XKeyEvent *e = &ev->xkey;
1038         KeySym ksym;
1039         char buf[32];
1040         char *customkey;
1041         int len;
1042         int meta;
1043         int shift;
1044
1045         meta  = e->state & Mod1Mask;
1046         shift = e->state & ShiftMask;
1047         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1048
1049         if(customkey = kmap(ksym))
1050                 ttywrite(customkey, strlen(customkey));
1051         else if(len > 0) {
1052                 buf[sizeof(buf)-1] = '\0';
1053                 if(meta && len == 1)
1054                         ttywrite("\033", 1);
1055                 ttywrite(buf, len);
1056         } else
1057                 switch(ksym) {
1058                 case XK_Insert:
1059                         if(shift)
1060                                 /* XXX: paste X clipboard */;
1061                         break;
1062                 default:
1063                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1064                         break;
1065                 }
1066 }
1067
1068 void
1069 resize(XEvent *e) {
1070         int col, row;
1071         col = e->xconfigure.width / xw.cw;
1072         row = e->xconfigure.height / xw.ch;
1073
1074         if(term.col != col || term.row != row) {
1075                 tresize(col, row);
1076                 ttyresize(col, row);
1077                 xw.w = e->xconfigure.width;
1078                 xw.h = e->xconfigure.height;
1079                 draw(SCredraw);
1080         }
1081 }
1082
1083 void
1084 run(void) {
1085         XEvent ev;
1086         fd_set rfd;
1087         int xfd = XConnectionNumber(xw.dis);
1088
1089         running = 1;
1090         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1091         XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
1092
1093         while(running) {
1094                 FD_ZERO(&rfd);
1095                 FD_SET(cmdfd, &rfd);
1096                 FD_SET(xfd, &rfd);
1097                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1098                         if(errno == EINTR)
1099                                 continue;
1100                         die("select failed: %s\n", SERRNO);
1101                 }
1102                 if(FD_ISSET(cmdfd, &rfd)) {
1103                         ttyread();
1104                         draw(SCupdate);
1105                 }
1106                 while(XPending(xw.dis)) {
1107                         XNextEvent(xw.dis, &ev);
1108                         if(handler[ev.type])
1109                                 (handler[ev.type])(&ev);
1110                 }
1111         }
1112 }
1113
1114 int
1115 main(int argc, char *argv[]) {
1116         if(argc == 2 && !strncmp("-v", argv[1], 3))
1117                 die("st-" VERSION ", © 2009 st engineers\n");
1118         else if(argc != 1)
1119                 die("usage: st [-v]\n");
1120         setlocale(LC_CTYPE, "");
1121         tnew(80, 24);
1122         ttynew();
1123         xinit();
1124         run();
1125         return 0;
1126 }