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 #if   defined(__linux)
  24  #include <pty.h>
  25 #elif defined(__OpenBSD__) || defined(__NetBSD__)
  26  #include <util.h>
  27 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  28  #include <libutil.h>
  29 #endif
  30
  31 /* Arbitrary sizes */
  32 #define ESC_TITLE_SIZ 256
  33 #define ESC_BUF_SIZ   256
  34 #define ESC_ARG_SIZ   16
  35 #define DRAW_BUF_SIZ  1024
  36
  37 #define SERRNO strerror(errno)
  38 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  39 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  40 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  41 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  42 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  43 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  44 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  45 #define IS_SET(flag) (term.mode & (flag))
  46
  47 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  48 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  49 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
  50        CURSOR_SAVE, CURSOR_LOAD };
  51 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  52 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  53 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8 };
  54 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  55 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  56
  57 typedef struct {
  58         char c;     /* character code  */
  59         char mode;  /* attribute flags */
  60         int fg;     /* foreground      */
  61         int bg;     /* background      */
  62         char state; /* state flags     */
  63 } Glyph;
  64
  65 typedef Glyph* Line;
  66
  67 typedef struct {
  68         Glyph attr;      /* current char attributes */
  69         int x;
  70         int y;
  71         char state;
  72 } TCursor;
  73
  74 /* CSI Escape sequence structs */
  75 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  76 typedef struct {
  77         char buf[ESC_BUF_SIZ]; /* raw string */
  78         int len;                           /* raw string length */
  79         char priv;
  80         int arg[ESC_ARG_SIZ];
  81         int narg;                          /* nb of args */
  82         char mode;
  83 } CSIEscape;
  84
  85 /* Internal representation of the screen */
  86 typedef struct {
  87         int row;        /* nb row */
  88         int col;        /* nb col */
  89         Line* line;     /* screen */
  90         Line* alt;      /* alternate screen */
  91         TCursor c;      /* cursor */
  92         int top;        /* top    scroll limit */
  93         int bot;        /* bottom scroll limit */
  94         int mode;       /* terminal mode flags */
  95         int esc;        /* escape state flags */
  96         char title[ESC_TITLE_SIZ];
  97         int titlelen;
  98 } Term;
  99
 100 /* Purely graphic info */
 101 typedef struct {
 102         Display* dis;
 103         Window win;
 104         Pixmap buf;
 105         int scr;
 106         int w;  /* window width  */
 107         int h;  /* window height */
 108         int bufw; /* pixmap width  */
 109         int bufh; /* pixmap height */
 110         int ch; /* char height */
 111         int cw; /* char width  */
 112         int hasfocus;
 113 } XWindow;
 114
 115 typedef struct {
 116         KeySym k;
 117         char s[ESC_BUF_SIZ];
 118 } Key;
 119
 120 /* Drawing Context */
 121 typedef struct {
 122         unsigned long col[256];
 123         XFontStruct* font;
 124         XFontStruct* bfont;
 125         GC gc;
 126 } DC;
 127
 128 typedef struct {
 129         int mode;
 130         int bx, by;
 131         int ex, ey;
 132         int b[2], e[2];
 133         char *clip;
 134 } Selection;
 135
 136 #include "config.h"
 137
 138 static void die(const char *errstr, ...);
 139 static void draw(int);
 140 static void execsh(void);
 141 static void sigchld(int);
 142 static void run(void);
 143
 144 static void csidump(void);
 145 static void csihandle(void);
 146 static void csiparse(void);
 147 static void csireset(void);
 148
 149 static void tclearregion(int, int, int, int);
 150 static void tcursor(int);
 151 static void tdeletechar(int);
 152 static void tdeleteline(int);
 153 static void tinsertblank(int);
 154 static void tinsertblankline(int);
 155 static void tmoveto(int, int);
 156 static void tnew(int, int);
 157 static void tnewline(void);
 158 static void tputtab(void);
 159 static void tputc(char);
 160 static void tputs(char*, int);
 161 static void treset(void);
 162 static void tresize(int, int);
 163 static void tscrollup(int);
 164 static void tscrolldown(int);
 165 static void tsetattr(int*, int);
 166 static void tsetchar(char);
 167 static void tsetscroll(int, int);
 168 static void tswapscreen(void);
 169
 170 static void ttynew(void);
 171 static void ttyread(void);
 172 static void ttyresize(int, int);
 173 static void ttywrite(const char *, size_t);
 174
 175 static void xdraws(char *, Glyph, int, int, int);
 176 static void xhints(void);
 177 static void xclear(int, int, int, int);
 178 static void xdrawcursor(void);
 179 static void xinit(void);
 180 static void xloadcols(void);
 181 static void xseturgency(int);
 182
 183 static void expose(XEvent *);
 184 static char* kmap(KeySym);
 185 static void kpress(XEvent *);
 186 static void resize(XEvent *);
 187 static void focus(XEvent *);
 188 static void brelease(XEvent *e);
 189 static void bpress(XEvent *e);
 190 static void bmotion(XEvent *e);
 191
 192
 193 static void (*handler[LASTEvent])(XEvent *) = {
 194         [KeyPress] = kpress,
 195         [Expose] = expose,
 196         [ConfigureNotify] = resize,
 197         [FocusIn] = focus,
 198         [FocusOut] = focus,
 199         [MotionNotify] = bmotion,
 200         [ButtonPress] = bpress,
 201         [ButtonRelease] = brelease,
 202 };
 203
 204 /* Globals */
 205 static DC dc;
 206 static XWindow xw;
 207 static Term term;
 208 static CSIEscape escseq;
 209 static int cmdfd;
 210 static pid_t pid;
 211 static Selection sel;
 212
 213 static inline int selected(int x, int y) {
 214         if ((sel.ey==y && sel.by==y)) {
 215                 int bx = MIN(sel.bx, sel.ex);
 216                 int ex = MAX(sel.bx, sel.ex);
 217                 return (x>=bx && x<=ex);
 218         }
 219         return (((y>sel.b[1] && y<sel.e[1]) || (y==sel.e[1] && x<=sel.e[0])) || \
 220                 (y==sel.b[1] && x>=sel.b[0] && (x<=sel.e[0] || sel.b[1]!=sel.e[1])));
 221 }
 222
 223 static void getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 224         if(b) *b = e->xbutton.state,
 225                 *b=*b==4096?5:*b==2048?4:*b==1024?3:*b==512?2:*b==256?1:-1;
 226         *x = e->xbutton.x/xw.cw;
 227         *y = e->xbutton.y/xw.ch;
 228         sel.b[0] = sel.by<sel.ey?sel.bx:sel.ex;
 229         sel.b[1] = MIN(sel.by, sel.ey);
 230         sel.e[0] = sel.by<sel.ey?sel.ex:sel.bx;
 231         sel.e[1] = MAX(sel.by, sel.ey);
 232 }
 233
 234 static void bpress(XEvent *e) {
 235         sel.mode = 1;
 236         sel.ex = sel.bx = e->xbutton.x/xw.cw;
 237         sel.ey = sel.by = e->xbutton.y/xw.ch;
 238 }
 239
 240 static char *getseltext() {
 241         char *str, *ptr;
 242         int ls, x, y, sz;
 243         if(sel.bx==-1)
 244                 return NULL;
 245         sz = ((xw.w/xw.ch) * (sel.e[1]-sel.b[1]+2));
 246         ptr = str = malloc (sz);
 247         for(y = 0; y < term.row; y++) {
 248                 for(x = 0; x < term.col; x++) {
 249                         if(term.line[y][x].state & GLYPH_SET && (ls=selected(x, y))) {
 250                                 *ptr = term.line[y][x].c;
 251                                 ptr++;
 252                         }
 253                 }
 254                 if (ls) {
 255                         *ptr = '\n';
 256                         ptr++;
 257                 }
 258         }
 259         *ptr = 0;
 260         return str;
 261 }
 262
 263 /* TODO: use X11 clipboard */
 264 static void clipboard_copy(char *str) {
 265         free(sel.clip);
 266         sel.clip = str;
 267 }
 268
 269 static void clipboard_paste() {
 270         if(sel.clip)
 271                 ttywrite(sel.clip, strlen(sel.clip));
 272 }
 273
 274 /* TODO: doubleclick to select word */
 275 static void brelease(XEvent *e) {
 276         int b;
 277         sel.mode = 0;
 278         getbuttoninfo(e, &b, &sel.ex, &sel.ey);
 279         if(b==4)
 280                 tscrollup(1);
 281         else
 282         if(b==5)
 283                 tscrolldown(1);
 284         else
 285         if(sel.bx==sel.ex && sel.by==sel.ey) {
 286                 sel.bx = -1;
 287                 if(b==2)
 288                         clipboard_paste();
 289         } else {
 290                 if(b==1)
 291                         clipboard_copy(getseltext());
 292         }
 293         draw(1);
 294 }
 295
 296 static void bmotion(XEvent *e) {
 297         if (sel.mode) {
 298                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 299                 draw(1);
 300         }
 301 }
 302
 303 #ifdef DEBUG
 304 void
 305 tdump(void) {
 306         int row, col;
 307         Glyph c;
 308
 309         for(row = 0; row < term.row; row++) {
 310                 for(col = 0; col < term.col; col++) {
 311                         if(col == term.c.x && row == term.c.y)
 312                                 putchar('#');
 313                         else {
 314                                 c = term.line[row][col];
 315                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 316                         }
 317                 }
 318                 putchar('\n');
 319         }
 320 }
 321 #endif
 322
 323 void
 324 die(const char *errstr, ...) {
 325         va_list ap;
 326
 327         va_start(ap, errstr);
 328         vfprintf(stderr, errstr, ap);
 329         va_end(ap);
 330         exit(EXIT_FAILURE);
 331 }
 332
 333 void
 334 execsh(void) {
 335         char *args[3] = {getenv("SHELL"), "-i", NULL};
 336         DEFAULT(args[0], SHELL); /* if getenv() failed */
 337         putenv("TERM=" TNAME);
 338         execvp(args[0], args);
 339 }
 340
 341 void
 342 sigchld(int a) {
 343         int stat = 0;
 344         if(waitpid(pid, &stat, 0) < 0)
 345                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 346         if(WIFEXITED(stat))
 347                 exit(WEXITSTATUS(stat));
 348         else
 349                 exit(EXIT_FAILURE);
 350 }
 351
 352 void
 353 ttynew(void) {
 354         int m, s;
 355
 356         /* seems to work fine on linux, openbsd and freebsd */
 357         struct winsize w = {term.row, term.col, 0, 0};
 358         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 359                 die("openpty failed: %s\n", SERRNO);
 360
 361         switch(pid = fork()) {
 362         case -1:
 363                 die("fork failed\n");
 364                 break;
 365         case 0:
 366                 setsid(); /* create a new process group */
 367                 dup2(s, STDIN_FILENO);
 368                 dup2(s, STDOUT_FILENO);
 369                 dup2(s, STDERR_FILENO);
 370                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 371                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 372                 close(s);
 373                 close(m);
 374                 execsh();
 375                 break;
 376         default:
 377                 close(s);
 378                 cmdfd = m;
 379                 signal(SIGCHLD, sigchld);
 380         }
 381 }
 382
 383 void
 384 dump(char c) {
 385         static int col;
 386         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 387         if(++col % 10 == 0)
 388                 fprintf(stderr, "\n");
 389 }
 390
 391 void
 392 ttyread(void) {
 393         char buf[BUFSIZ] = {0};
 394         int ret;
 395
 396         if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
 397                 die("Couldn't read from shell: %s\n", SERRNO);
 398         else
 399                 tputs(buf, ret);
 400 }
 401
 402 void
 403 ttywrite(const char *s, size_t n) {
 404         if(write(cmdfd, s, n) == -1)
 405                 die("write error on tty: %s\n", SERRNO);
 406 }
 407
 408 void
 409 ttyresize(int x, int y) {
 410         struct winsize w;
 411
 412         w.ws_row = term.row;
 413         w.ws_col = term.col;
 414         w.ws_xpixel = w.ws_ypixel = 0;
 415         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 416                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 417 }
 418
 419 void
 420 tcursor(int mode) {
 421         static TCursor c;
 422
 423         if(mode == CURSOR_SAVE)
 424                 c = term.c;
 425         else if(mode == CURSOR_LOAD)
 426                 term.c = c, tmoveto(c.x, c.y);
 427 }
 428
 429 void
 430 treset(void) {
 431         term.c = (TCursor){{
 432                 .mode = ATTR_NULL,
 433                 .fg = DefaultFG,
 434                 .bg = DefaultBG
 435         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 436
 437         term.top = 0, term.bot = term.row - 1;
 438         term.mode = MODE_WRAP;
 439         tclearregion(0, 0, term.col-1, term.row-1);
 440 }
 441
 442 void
 443 tnew(int col, int row) {
 444         /* set screen size */
 445         term.row = row, term.col = col;
 446         term.line = malloc(term.row * sizeof(Line));
 447         term.alt  = malloc(term.row * sizeof(Line));
 448         for(row = 0 ; row < term.row; row++) {
 449                 term.line[row] = malloc(term.col * sizeof(Glyph));
 450                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 451         }
 452         /* setup screen */
 453         treset();
 454 }
 455
 456 void
 457 tswapscreen(void) {
 458         Line* tmp = term.line;
 459         term.line = term.alt;
 460         term.alt = tmp;
 461         term.mode ^= MODE_ALTSCREEN;
 462 }
 463
 464 void
 465 tscrolldown (int n) {
 466         int i;
 467         Line temp;
 468
 469         LIMIT(n, 0, term.bot-term.top+1);
 470
 471         for(i = 0; i < n; i++)
 472                 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
 473
 474         for(i = term.bot; i >= term.top+n; i--) {
 475                 temp = term.line[i];
 476                 term.line[i] = term.line[i-n];
 477                 term.line[i-n] = temp;
 478         }
 479 }
 480
 481 void
 482 tscrollup (int n) {
 483         int i;
 484         Line temp;
 485         LIMIT(n, 0, term.bot-term.top+1);
 486
 487         for(i = 0; i < n; i++)
 488                 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
 489
 490         for(i = term.top; i <= term.bot-n; i++) {
 491                  temp = term.line[i];
 492                  term.line[i] = term.line[i+n];
 493                  term.line[i+n] = temp;
 494         }
 495 }
 496
 497 void
 498 tnewline(void) {
 499         int y = term.c.y + 1;
 500         if(y > term.bot)
 501                 tscrollup(1), y = term.bot;
 502         tmoveto(0, y);
 503 }
 504
 505 void
 506 csiparse(void) {
 507         /* int noarg = 1; */
 508         char *p = escseq.buf;
 509
 510         escseq.narg = 0;
 511         if(*p == '?')
 512                 escseq.priv = 1, p++;
 513
 514         while(p < escseq.buf+escseq.len) {
 515                 while(isdigit(*p)) {
 516                         escseq.arg[escseq.narg] *= 10;
 517                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 518                 }
 519                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 520                         escseq.narg++, p++;
 521                 else {
 522                         escseq.mode = *p;
 523                         escseq.narg++;
 524                         return;
 525                 }
 526         }
 527 }
 528
 529 void
 530 tmoveto(int x, int y) {
 531         LIMIT(x, 0, term.col-1);
 532         LIMIT(y, 0, term.row-1);
 533         term.c.state &= ~CURSOR_WRAPNEXT;
 534         term.c.x = x;
 535         term.c.y = y;
 536 }
 537
 538 void
 539 tsetchar(char c) {
 540         term.line[term.c.y][term.c.x] = term.c.attr;
 541         term.line[term.c.y][term.c.x].c = c;
 542         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 543 }
 544
 545 void
 546 tclearregion(int x1, int y1, int x2, int y2) {
 547         int y, temp;
 548
 549         if(x1 > x2)
 550                 temp = x1, x1 = x2, x2 = temp;
 551         if(y1 > y2)
 552                 temp = y1, y1 = y2, y2 = temp;
 553
 554         LIMIT(x1, 0, term.col-1);
 555         LIMIT(x2, 0, term.col-1);
 556         LIMIT(y1, 0, term.row-1);
 557         LIMIT(y2, 0, term.row-1);
 558
 559         for(y = y1; y <= y2; y++)
 560                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 561 }
 562
 563 void
 564 tdeletechar(int n) {
 565         int src = term.c.x + n;
 566         int dst = term.c.x;
 567         int size = term.col - src;
 568
 569         if(src >= term.col) {
 570                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 571                 return;
 572         }
 573         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 574         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 575 }
 576
 577 void
 578 tinsertblank(int n) {
 579         int src = term.c.x;
 580         int dst = src + n;
 581         int size = term.col - dst;
 582
 583         if(dst >= term.col) {
 584                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 585                 return;
 586         }
 587         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 588         tclearregion(src, term.c.y, dst - 1, term.c.y);
 589 }
 590
 591 void
 592 tinsertblankline(int n) {
 593         int i;
 594         Line blank;
 595         int bot = term.bot;
 596
 597         if(term.c.y > term.bot)
 598                 bot = term.row - 1;
 599         else if(term.c.y < term.top)
 600                 bot = term.top - 1;
 601         if(term.c.y + n >= bot) {
 602                 tclearregion(0, term.c.y, term.col-1, bot);
 603                 return;
 604         }
 605         for(i = bot; i >= term.c.y+n; i--) {
 606                 /* swap deleted line <-> blanked line */
 607                 blank = term.line[i];
 608                 term.line[i] = term.line[i-n];
 609                 term.line[i-n] = blank;
 610                 /* blank it */
 611                 memset(blank, 0, term.col * sizeof(Glyph));
 612         }
 613 }
 614
 615 void
 616 tdeleteline(int n) {
 617         int i;
 618         Line blank;
 619         int bot = term.bot;
 620
 621         if(term.c.y > term.bot)
 622                 bot = term.row - 1;
 623         else if(term.c.y < term.top)
 624                 bot = term.top - 1;
 625         if(term.c.y + n >= bot) {
 626                 tclearregion(0, term.c.y, term.col-1, bot);
 627                 return;
 628         }
 629         for(i = term.c.y; i <= bot-n; i++) {
 630                 /* swap deleted line <-> blanked line */
 631                 blank = term.line[i];
 632                 term.line[i] = term.line[i+n];
 633                 term.line[i+n] = blank;
 634                 /* blank it */
 635                 memset(blank, 0, term.col * sizeof(Glyph));
 636         }
 637 }
 638
 639 void
 640 tsetattr(int *attr, int l) {
 641         int i;
 642
 643         for(i = 0; i < l; i++) {
 644                 switch(attr[i]) {
 645                 case 0:
 646                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 647                         term.c.attr.fg = DefaultFG;
 648                         term.c.attr.bg = DefaultBG;
 649                         break;
 650                 case 1:
 651                         term.c.attr.mode |= ATTR_BOLD;
 652                         break;
 653                 case 4:
 654                         term.c.attr.mode |= ATTR_UNDERLINE;
 655                         break;
 656                 case 7:
 657                         term.c.attr.mode |= ATTR_REVERSE;
 658                         break;
 659                 case 22:
 660                         term.c.attr.mode &= ~ATTR_BOLD;
 661                         break;
 662                 case 24:
 663                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 664                         break;
 665                 case 27:
 666                         term.c.attr.mode &= ~ATTR_REVERSE;
 667                         break;
 668                 case 38:
 669                         if (i + 2 < l && attr[i + 1] == 5) {
 670                                 i += 2;
 671                                 if (BETWEEN(attr[i], 0, 255))
 672                                         term.c.attr.fg = attr[i];
 673                                 else
 674                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 675                         }
 676                         else
 677                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 678                         break;
 679                 case 39:
 680                         term.c.attr.fg = DefaultFG;
 681                         break;
 682                 case 48:
 683                         if (i + 2 < l && attr[i + 1] == 5) {
 684                                 i += 2;
 685                                 if (BETWEEN(attr[i], 0, 255))
 686                                         term.c.attr.bg = attr[i];
 687                                 else
 688                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 689                         }
 690                         else
 691                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 692                         break;
 693                 case 49:
 694                         term.c.attr.bg = DefaultBG;
 695                         break;
 696                 default:
 697                         if(BETWEEN(attr[i], 30, 37))
 698                                 term.c.attr.fg = attr[i] - 30;
 699                         else if(BETWEEN(attr[i], 40, 47))
 700                                 term.c.attr.bg = attr[i] - 40;
 701                         else if(BETWEEN(attr[i], 90, 97))
 702                                 term.c.attr.fg = attr[i] - 90 + 8;
 703                         else if(BETWEEN(attr[i], 100, 107))
 704                                 term.c.attr.fg = attr[i] - 100 + 8;
 705                         else
 706                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 707                         break;
 708                 }
 709         }
 710 }
 711
 712 void
 713 tsetscroll(int t, int b) {
 714         int temp;
 715
 716         LIMIT(t, 0, term.row-1);
 717         LIMIT(b, 0, term.row-1);
 718         if(t > b) {
 719                 temp = t;
 720                 t = b;
 721                 b = temp;
 722         }
 723         term.top = t;
 724         term.bot = b;
 725 }
 726
 727 void
 728 csihandle(void) {
 729         switch(escseq.mode) {
 730         default:
 731         unknown:
 732                 printf("erresc: unknown csi ");
 733                 csidump();
 734                 /* die(""); */
 735                 break;
 736         case '@': /* ICH -- Insert <n> blank char */
 737                 DEFAULT(escseq.arg[0], 1);
 738                 tinsertblank(escseq.arg[0]);
 739                 break;
 740         case 'A': /* CUU -- Cursor <n> Up */
 741         case 'e':
 742                 DEFAULT(escseq.arg[0], 1);
 743                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 744                 break;
 745         case 'B': /* CUD -- Cursor <n> Down */
 746                 DEFAULT(escseq.arg[0], 1);
 747                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 748                 break;
 749         case 'C': /* CUF -- Cursor <n> Forward */
 750         case 'a':
 751                 DEFAULT(escseq.arg[0], 1);
 752                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 753                 break;
 754         case 'D': /* CUB -- Cursor <n> Backward */
 755                 DEFAULT(escseq.arg[0], 1);
 756                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 757                 break;
 758         case 'E': /* CNL -- Cursor <n> Down and first col */
 759                 DEFAULT(escseq.arg[0], 1);
 760                 tmoveto(0, term.c.y+escseq.arg[0]);
 761                 break;
 762         case 'F': /* CPL -- Cursor <n> Up and first col */
 763                 DEFAULT(escseq.arg[0], 1);
 764                 tmoveto(0, term.c.y-escseq.arg[0]);
 765                 break;
 766         case 'G': /* CHA -- Move to <col> */
 767         case '`': /* XXX: HPA -- same? */
 768                 DEFAULT(escseq.arg[0], 1);
 769                 tmoveto(escseq.arg[0]-1, term.c.y);
 770                 break;
 771         case 'H': /* CUP -- Move to <row> <col> */
 772         case 'f': /* XXX: HVP -- same? */
 773                 DEFAULT(escseq.arg[0], 1);
 774                 DEFAULT(escseq.arg[1], 1);
 775                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 776                 break;
 777         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 778         case 'J': /* ED -- Clear screen */
 779                 switch(escseq.arg[0]) {
 780                 case 0: /* below */
 781                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 782                         break;
 783                 case 1: /* above */
 784                         tclearregion(0, 0, term.c.x, term.c.y);
 785                         break;
 786                 case 2: /* all */
 787                         tclearregion(0, 0, term.col-1, term.row-1);
 788                         break;
 789                 default:
 790                         goto unknown;
 791                 }
 792                 break;
 793         case 'K': /* EL -- Clear line */
 794                 switch(escseq.arg[0]) {
 795                 case 0: /* right */
 796                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 797                         break;
 798                 case 1: /* left */
 799                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 800                         break;
 801                 case 2: /* all */
 802                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 803                         break;
 804                 }
 805                 break;
 806         case 'S': /* SU -- Scroll <n> line up */
 807                 DEFAULT(escseq.arg[0], 1);
 808                 tscrollup(escseq.arg[0]);
 809                 break;
 810         case 'T': /* SD -- Scroll <n> line down */
 811                 DEFAULT(escseq.arg[0], 1);
 812                 tscrolldown(escseq.arg[0]);
 813                 break;
 814         case 'L': /* IL -- Insert <n> blank lines */
 815                 DEFAULT(escseq.arg[0], 1);
 816                 tinsertblankline(escseq.arg[0]);
 817                 break;
 818         case 'l': /* RM -- Reset Mode */
 819                 if(escseq.priv) {
 820                         switch(escseq.arg[0]) {
 821                         case 1:
 822                                 term.mode &= ~MODE_APPKEYPAD;
 823                                 break;
 824                         case 7:
 825                                 term.mode &= ~MODE_WRAP;
 826                                 break;
 827                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 828                                 break;
 829                         case 25:
 830                                 term.c.state |= CURSOR_HIDE;
 831                                 break;
 832                         case 1049: /* = 1047 and 1048 */
 833                         case 1047:
 834                                 if(IS_SET(MODE_ALTSCREEN)) {
 835                                         tclearregion(0, 0, term.col-1, term.row-1);
 836                                         tswapscreen();
 837                                 }
 838                                 if(escseq.arg[0] == 1047)
 839                                         break;
 840                         case 1048:
 841                                 tcursor(CURSOR_LOAD);
 842                                 break;
 843                         default:
 844                                 goto unknown;
 845                         }
 846                 } else {
 847                         switch(escseq.arg[0]) {
 848                         case 4:
 849                                 term.mode &= ~MODE_INSERT;
 850                                 break;
 851                         default:
 852                                 goto unknown;
 853                         }
 854                 }
 855                 break;
 856         case 'M': /* DL -- Delete <n> lines */
 857                 DEFAULT(escseq.arg[0], 1);
 858                 tdeleteline(escseq.arg[0]);
 859                 break;
 860         case 'X': /* ECH -- Erase <n> char */
 861                 DEFAULT(escseq.arg[0], 1);
 862                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 863                 break;
 864         case 'P': /* DCH -- Delete <n> char */
 865                 DEFAULT(escseq.arg[0], 1);
 866                 tdeletechar(escseq.arg[0]);
 867                 break;
 868         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 869         case 'd': /* VPA -- Move to <row> */
 870                 DEFAULT(escseq.arg[0], 1);
 871                 tmoveto(term.c.x, escseq.arg[0]-1);
 872                 break;
 873         case 'h': /* SM -- Set terminal mode */
 874                 if(escseq.priv) {
 875                         switch(escseq.arg[0]) {
 876                         case 1:
 877                                 term.mode |= MODE_APPKEYPAD;
 878                                 break;
 879                         case 7:
 880                                 term.mode |= MODE_WRAP;
 881                                 break;
 882                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 883                                 break;
 884                         case 25:
 885                                 term.c.state &= ~CURSOR_HIDE;
 886                                 break;
 887                         case 1049: /* = 1047 and 1048 */
 888                         case 1047:
 889                                 if(IS_SET(MODE_ALTSCREEN))
 890                                         tclearregion(0, 0, term.col-1, term.row-1);
 891                                 else
 892                                         tswapscreen();
 893                                 if(escseq.arg[0] == 1047)
 894                                         break;
 895                         case 1048:
 896                                 tcursor(CURSOR_SAVE);
 897                                 break;
 898                         default: goto unknown;
 899                         }
 900                 } else {
 901                         switch(escseq.arg[0]) {
 902                         case 4:
 903                                 term.mode |= MODE_INSERT;
 904                                 break;
 905                         default: goto unknown;
 906                         }
 907                 };
 908                 break;
 909         case 'm': /* SGR -- Terminal attribute (color) */
 910                 tsetattr(escseq.arg, escseq.narg);
 911                 break;
 912         case 'r': /* DECSTBM -- Set Scrolling Region */
 913                 if(escseq.priv)
 914                         goto unknown;
 915                 else {
 916                         DEFAULT(escseq.arg[0], 1);
 917                         DEFAULT(escseq.arg[1], term.row);
 918                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 919                         tmoveto(0, 0);
 920                 }
 921                 break;
 922         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 923                 tcursor(CURSOR_SAVE);
 924                 break;
 925         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 926                 tcursor(CURSOR_LOAD);
 927                 break;
 928         }
 929 }
 930
 931 void
 932 csidump(void) {
 933         int i;
 934         printf("ESC [ %s", escseq.priv ? "? " : "");
 935         if(escseq.narg)
 936                 for(i = 0; i < escseq.narg; i++)
 937                         printf("%d ", escseq.arg[i]);
 938         if(escseq.mode)
 939                 putchar(escseq.mode);
 940         putchar('\n');
 941 }
 942
 943 void
 944 csireset(void) {
 945         memset(&escseq, 0, sizeof(escseq));
 946 }
 947
 948 void
 949 tputtab(void) {
 950         int space = TAB - term.c.x % TAB;
 951         tmoveto(term.c.x + space, term.c.y);
 952 }
 953
 954 void
 955 tputc(char c) {
 956         if(term.esc & ESC_START) {
 957                 if(term.esc & ESC_CSI) {
 958                         escseq.buf[escseq.len++] = c;
 959                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 960                                 term.esc = 0;
 961                                 csiparse(), csihandle();
 962                         }
 963                 } else if(term.esc & ESC_OSC) {
 964                         if(c == ';') {
 965                                 term.titlelen = 0;
 966                                 term.esc = ESC_START | ESC_TITLE;
 967                         }
 968                 } else if(term.esc & ESC_TITLE) {
 969                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 970                                 term.esc = 0;
 971                                 term.title[term.titlelen] = '\0';
 972                                 XStoreName(xw.dis, xw.win, term.title);
 973                         } else {
 974                                 term.title[term.titlelen++] = c;
 975                         }
 976                 } else if(term.esc & ESC_ALTCHARSET) {
 977                         switch(c) {
 978                         case '0': /* Line drawing crap */
 979                                 term.c.attr.mode |= ATTR_GFX;
 980                                 break;
 981                         case 'B': /* Back to regular text */
 982                                 term.c.attr.mode &= ~ATTR_GFX;
 983                                 break;
 984                         default:
 985                                 printf("esc unhandled charset: ESC ( %c\n", c);
 986                         }
 987                         term.esc = 0;
 988                 } else {
 989                         switch(c) {
 990                         case '[':
 991                                 term.esc |= ESC_CSI;
 992                                 break;
 993                         case ']':
 994                                 term.esc |= ESC_OSC;
 995                                 break;
 996                         case '(':
 997                                 term.esc |= ESC_ALTCHARSET;
 998                                 break;
 999                         case 'D': /* IND -- Linefeed */
1000                                 if(term.c.y == term.bot)
1001                                         tscrollup(1);
1002                                 else
1003                                         tmoveto(term.c.x, term.c.y+1);
1004                                 term.esc = 0;
1005                                 break;
1006                         case 'E': /* NEL -- Next line */
1007                                 tnewline();
1008                                 term.esc = 0;
1009                                 break;
1010                         case 'M': /* RI -- Reverse index */
1011                                 if(term.c.y == term.top)
1012                                         tscrolldown(1);
1013                                 else
1014                                         tmoveto(term.c.x, term.c.y-1);
1015                                 term.esc = 0;
1016                                 break;
1017                         case 'c': /* RIS -- Reset to inital state */
1018                                 treset();
1019                                 term.esc = 0;
1020                                 break;
1021                         case '=': /* DECPAM -- Application keypad */
1022                                 term.mode |= MODE_APPKEYPAD;
1023                                 term.esc = 0;
1024                                 break;
1025                         case '>': /* DECPNM -- Normal keypad */
1026                                 term.mode &= ~MODE_APPKEYPAD;
1027                                 term.esc = 0;
1028                                 break;
1029                         case '7': /* DECSC -- Save Cursor */
1030                                 tcursor(CURSOR_SAVE);
1031                                 term.esc = 0;
1032                                 break;
1033                         case '8': /* DECRC -- Restore Cursor */
1034                                 tcursor(CURSOR_LOAD);
1035                                 term.esc = 0;
1036                                 break;
1037                         default:
1038                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
1039                                 term.esc = 0;
1040                         }
1041                 }
1042         } else {
1043                 switch(c) {
1044                 case '\t':
1045                         tputtab();
1046                         break;
1047                 case '\b':
1048                         tmoveto(term.c.x-1, term.c.y);
1049                         break;
1050                 case '\r':
1051                         tmoveto(0, term.c.y);
1052                         break;
1053                 case '\n':
1054                         tnewline();
1055                         break;
1056                 case '\a':
1057                         if(!xw.hasfocus)
1058                                 xseturgency(1);
1059                         break;
1060                 case '\033':
1061                         csireset();
1062                         term.esc = ESC_START;
1063                         break;
1064                 default:
1065                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1066                                 tnewline();
1067                         tsetchar(c);
1068                         if(term.c.x+1 < term.col)
1069                                 tmoveto(term.c.x+1, term.c.y);
1070                         else
1071                                 term.c.state |= CURSOR_WRAPNEXT;
1072                         break;
1073                 }
1074         }
1075 }
1076
1077 void
1078 tputs(char *s, int len) {
1079         for(; len > 0; len--)
1080                 tputc(*s++);
1081 }
1082
1083 void
1084 tresize(int col, int row) {
1085         int i;
1086         int minrow = MIN(row, term.row);
1087         int mincol = MIN(col, term.col);
1088
1089         if(col < 1 || row < 1)
1090                 return;
1091
1092         /* free uneeded rows */
1093         for(i = row; i < term.row; i++) {
1094                 free(term.line[i]);
1095                 free(term.alt[i]);
1096         }
1097
1098         /* resize to new height */
1099         term.line = realloc(term.line, row * sizeof(Line));
1100         term.alt  = realloc(term.alt,  row * sizeof(Line));
1101
1102         /* resize each row to new width, zero-pad if needed */
1103         for(i = 0; i < minrow; i++) {
1104                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1105                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1106                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1107                 memset(term.alt[i]  + mincol, 0, (col - mincol) * sizeof(Glyph));
1108         }
1109
1110         /* allocate any new rows */
1111         for(/* i == minrow */; i < row; i++) {
1112                 term.line[i] = calloc(col, sizeof(Glyph));
1113                 term.alt [i] = calloc(col, sizeof(Glyph));
1114         }
1115
1116         /* update terminal size */
1117         term.col = col, term.row = row;
1118         /* make use of the LIMIT in tmoveto */
1119         tmoveto(term.c.x, term.c.y);
1120         /* reset scrolling region */
1121         tsetscroll(0, row-1);
1122 }
1123
1124 void
1125 xloadcols(void) {
1126         int i, r, g, b;
1127         XColor color;
1128         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1129         unsigned long white = WhitePixel(xw.dis, xw.scr);
1130
1131         for(i = 0; i < 16; i++) {
1132                 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1133                         dc.col[i] = white;
1134                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1135                 } else
1136                         dc.col[i] = color.pixel;
1137         }
1138
1139         /* same colors as xterm */
1140         for(r = 0; r < 6; r++)
1141                 for(g = 0; g < 6; g++)
1142                         for(b = 0; b < 6; b++) {
1143                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1144                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1145                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1146                                 if (!XAllocColor(xw.dis, cmap, &color)) {
1147                                         dc.col[i] = white;
1148                                         fprintf(stderr, "Could not allocate color %d\n", i);
1149                                 } else
1150                                         dc.col[i] = color.pixel;
1151                                 i++;
1152                         }
1153
1154         for(r = 0; r < 24; r++, i++) {
1155                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1156                 if (!XAllocColor(xw.dis, cmap, &color)) {
1157                         dc.col[i] = white;
1158                         fprintf(stderr, "Could not allocate color %d\n", i);
1159                 } else
1160                         dc.col[i] = color.pixel;
1161         }
1162 }
1163
1164 void
1165 xclear(int x1, int y1, int x2, int y2) {
1166         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1167         XFillRectangle(xw.dis, xw.buf, dc.gc,
1168                        x1 * xw.cw, y1 * xw.ch,
1169                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1170 }
1171
1172 void
1173 xhints(void)
1174 {
1175         XClassHint class = {TNAME, TNAME};
1176         XWMHints wm = {.flags = InputHint, .input = 1};
1177         XSizeHints size = {
1178                 .flags = PSize | PResizeInc | PBaseSize,
1179                 .height = xw.h,
1180                 .width = xw.w,
1181                 .height_inc = xw.ch,
1182                 .width_inc = xw.cw,
1183                 .base_height = 2*BORDER,
1184                 .base_width = 2*BORDER,
1185         };
1186         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1187 }
1188
1189 void
1190 xinit(void) {
1191         if(!(xw.dis = XOpenDisplay(NULL)))
1192                 die("Can't open display\n");
1193         xw.scr = XDefaultScreen(xw.dis);
1194
1195         /* font */
1196         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1197                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1198
1199         /* XXX: Assuming same size for bold font */
1200         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1201         xw.ch = dc.font->ascent + dc.font->descent;
1202
1203         /* colors */
1204         xloadcols();
1205
1206         /* windows */
1207         xw.h = term.row * xw.ch + 2*BORDER;
1208         xw.w = term.col * xw.cw + 2*BORDER;
1209         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1210                         xw.w, xw.h, 0,
1211                         dc.col[DefaultBG],
1212                         dc.col[DefaultBG]);
1213         xw.bufw = xw.w - 2*BORDER;
1214         xw.bufh = xw.h - 2*BORDER;
1215         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1216         /* gc */
1217         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1218
1219         /* event mask */
1220         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask
1221                 | StructureNotifyMask | FocusChangeMask | PointerMotionMask
1222                 | ButtonPressMask | ButtonReleaseMask);
1223
1224         XMapWindow(xw.dis, xw.win);
1225         xhints();
1226         XStoreName(xw.dis, xw.win, "st");
1227         XSync(xw.dis, 0);
1228 }
1229
1230 void
1231 xdraws(char *s, Glyph base, int x, int y, int len) {
1232         unsigned long xfg, xbg;
1233         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1234         int i;
1235
1236         if(base.mode & ATTR_REVERSE)
1237                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1238         else
1239                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1240
1241         XSetBackground(xw.dis, dc.gc, xbg);
1242         XSetForeground(xw.dis, dc.gc, xfg);
1243
1244         if(base.mode & ATTR_GFX)
1245                 for(i = 0; i < len; i++)
1246                         s[i] = gfx[(int)s[i]];
1247
1248         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1249         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1250
1251         if(base.mode & ATTR_UNDERLINE)
1252                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1253 }
1254
1255 void
1256 xdrawcursor(void) {
1257         static int oldx = 0;
1258         static int oldy = 0;
1259         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1260
1261         LIMIT(oldx, 0, term.col-1);
1262         LIMIT(oldy, 0, term.row-1);
1263
1264         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1265                 g.c = term.line[term.c.y][term.c.x].c;
1266
1267         /* remove the old cursor */
1268         if(term.line[oldy][oldx].state & GLYPH_SET)
1269                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1270         else
1271                 xclear(oldx, oldy, oldx, oldy);
1272
1273         /* draw the new one */
1274         if(!(term.c.state & CURSOR_HIDE) && xw.hasfocus) {
1275                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1276                 oldx = term.c.x, oldy = term.c.y;
1277         }
1278 }
1279
1280 #ifdef DEBUG
1281 /* basic drawing routines */
1282 void
1283 xdrawc(int x, int y, Glyph g) {
1284         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1285         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1286         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1287         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1288         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1289 }
1290
1291 void
1292 draw(int dummy) {
1293         int x, y;
1294
1295         xclear(0, 0, term.col-1, term.row-1);
1296         for(y = 0; y < term.row; y++)
1297                 for(x = 0; x < term.col; x++)
1298                         if(term.line[y][x].state & GLYPH_SET)
1299                                 xdrawc(x, y, term.line[y][x]);
1300
1301         xdrawcursor();
1302         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1303         XFlush(xw.dis);
1304 }
1305
1306 #else
1307 /* optimized drawing routine */
1308 void
1309 draw(int redraw_all) {
1310         int i, x, y, ox;
1311         Glyph base, new;
1312         char buf[DRAW_BUF_SIZ];
1313
1314         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1315         XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.bufw, xw.bufh);
1316         for(y = 0; y < term.row; y++) {
1317                 base = term.line[y][0];
1318                 i = ox = 0;
1319                 for(x = 0; x < term.col; x++) {
1320                         new = term.line[y][x];
1321                         if(sel.bx!=-1 && new.c && selected(x, y))
1322                                 new.mode ^= ATTR_REVERSE;
1323                         if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1324                                         i >= DRAW_BUF_SIZ)) {
1325                                 xdraws(buf, base, ox, y, i);
1326                                 i = 0;
1327                         }
1328                         if(new.state & GLYPH_SET) {
1329                                 if(i == 0) {
1330                                         ox = x;
1331                                         base = new;
1332                                 }
1333                                 buf[i++] = new.c;
1334                         }
1335                 }
1336                 if(i > 0)
1337                         xdraws(buf, base, ox, y, i);
1338         }
1339         xdrawcursor();
1340         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1341         XFlush(xw.dis);
1342 }
1343
1344 #endif
1345
1346 void
1347 expose(XEvent *ev) {
1348         draw(SCREEN_REDRAW);
1349 }
1350
1351 void
1352 xseturgency(int add) {
1353         XWMHints *h = XGetWMHints(xw.dis, xw.win);
1354         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1355         XSetWMHints(xw.dis, xw.win, h);
1356         XFree(h);
1357 }
1358
1359 void
1360 focus(XEvent *ev) {
1361         if((xw.hasfocus = ev->type == FocusIn))
1362                 xseturgency(0);
1363         draw(SCREEN_UPDATE);
1364 }
1365
1366 char*
1367 kmap(KeySym k) {
1368         int i;
1369         for(i = 0; i < LEN(key); i++)
1370                 if(key[i].k == k)
1371                         return (char*)key[i].s;
1372         return NULL;
1373 }
1374
1375 void
1376 kpress(XEvent *ev) {
1377         XKeyEvent *e = &ev->xkey;
1378         KeySym ksym;
1379         char buf[32];
1380         char *customkey;
1381         int len;
1382         int meta;
1383         int shift;
1384
1385         meta = e->state & Mod1Mask;
1386         shift = e->state & ShiftMask;
1387         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1388
1389         if((customkey = kmap(ksym)))
1390                 ttywrite(customkey, strlen(customkey));
1391         else if(len > 0) {
1392                 buf[sizeof(buf)-1] = '\0';
1393                 if(meta && len == 1)
1394                         ttywrite("\033", 1);
1395                 ttywrite(buf, len);
1396         } else
1397                 switch(ksym) {
1398                 case XK_Up:
1399                 case XK_Down:
1400                 case XK_Left:
1401                 case XK_Right:
1402                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1403                         ttywrite(buf, 3);
1404                         break;
1405                 case XK_Insert:
1406                         if(shift)
1407                                 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1408                         break;
1409                 default:
1410                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1411                         break;
1412                 }
1413 }
1414
1415 void
1416 resize(XEvent *e) {
1417         int col, row;
1418
1419         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1420                 return;
1421
1422         xw.w = e->xconfigure.width;
1423         xw.h = e->xconfigure.height;
1424         xw.bufw = xw.w - 2*BORDER;
1425         xw.bufh = xw.h - 2*BORDER;
1426         col = xw.bufw / xw.cw;
1427         row = xw.bufh / xw.ch;
1428         tresize(col, row);
1429         ttyresize(col, row);
1430         xw.bufh = MAX(1, xw.bufh);
1431         xw.bufw = MAX(1, xw.bufw);
1432         XFreePixmap(xw.dis, xw.buf);
1433         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1434         draw(SCREEN_REDRAW);
1435 }
1436
1437 void
1438 run(void) {
1439         XEvent ev;
1440         fd_set rfd;
1441         int xfd = XConnectionNumber(xw.dis);
1442
1443         for(;;) {
1444                 FD_ZERO(&rfd);
1445                 FD_SET(cmdfd, &rfd);
1446                 FD_SET(xfd, &rfd);
1447                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1448                         if(errno == EINTR)
1449                                 continue;
1450                         die("select failed: %s\n", SERRNO);
1451                 }
1452                 if(FD_ISSET(cmdfd, &rfd)) {
1453                         ttyread();
1454                         draw(SCREEN_UPDATE);
1455                 }
1456                 while(XPending(xw.dis)) {
1457                         XNextEvent(xw.dis, &ev);
1458                         if(handler[ev.type])
1459                                 (handler[ev.type])(&ev);
1460                 }
1461         }
1462 }
1463
1464 int
1465 main(int argc, char *argv[]) {
1466         if(argc == 2 && !strncmp("-v", argv[1], 3))
1467                 die("st-" VERSION ", (c) 2010 st engineers\n");
1468         else if(argc != 1)
1469                 die("usage: st [-v]\n");
1470         setlocale(LC_CTYPE, "");
1471         tnew(80, 24);
1472         ttynew();
1473         xinit();
1474         run();
1475         return 0;
1476 }