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