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