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 *);
 189 static void bpress(XEvent *);
 190 static void bmotion(XEvent *);
 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 void
 214 selinit(void) {
 215         sel.mode = 0;
 216         sel.bx = -1;
 217         sel.clip = NULL;
 218 }
 219
 220 static inline int selected(int x, int y) {
 221         if ((sel.ey==y && sel.by==y)) {
 222                 int bx = MIN(sel.bx, sel.ex);
 223                 int ex = MAX(sel.bx, sel.ex);
 224                 return (x>=bx && x<=ex);
 225         }
 226         return (((y>sel.b[1] && y<sel.e[1]) || (y==sel.e[1] && x<=sel.e[0])) || \
 227                 (y==sel.b[1] && x>=sel.b[0] && (x<=sel.e[0] || sel.b[1]!=sel.e[1])));
 228 }
 229
 230 static void getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 231         if(b) *b = e->xbutton.state,
 232                 *b=*b==4096?5:*b==2048?4:*b==1024?3:*b==512?2:*b==256?1:-1;
 233         *x = e->xbutton.x/xw.cw;
 234         *y = e->xbutton.y/xw.ch;
 235         sel.b[0] = sel.by<sel.ey?sel.bx:sel.ex;
 236         sel.b[1] = MIN(sel.by, sel.ey);
 237         sel.e[0] = sel.by<sel.ey?sel.ex:sel.bx;
 238         sel.e[1] = MAX(sel.by, sel.ey);
 239 }
 240
 241 static void bpress(XEvent *e) {
 242         sel.mode = 1;
 243         sel.ex = sel.bx = e->xbutton.x/xw.cw;
 244         sel.ey = sel.by = e->xbutton.y/xw.ch;
 245 }
 246
 247 static char *getseltext() {
 248         char *str, *ptr;
 249         int ls, x, y, sz;
 250         if(sel.bx==-1)
 251                 return NULL;
 252         sz = ((xw.w/xw.ch) * (sel.e[1]-sel.b[1]+2));
 253         ptr = str = malloc (sz);
 254         for(y = 0; y < term.row; y++) {
 255                 for(x = 0; x < term.col; x++) {
 256                         if(term.line[y][x].state & GLYPH_SET && (ls=selected(x, y))) {
 257                                 *ptr = term.line[y][x].c;
 258                                 ptr++;
 259                         }
 260                 }
 261                 if (ls) {
 262                         *ptr = '\n';
 263                         ptr++;
 264                 }
 265         }
 266         *ptr = 0;
 267         return str;
 268 }
 269
 270 /* TODO: use X11 clipboard */
 271 static void selcopy(char *str) {
 272         free(sel.clip);
 273         sel.clip = str;
 274 }
 275
 276 static void selpaste() {
 277         if(sel.clip)
 278                 ttywrite(sel.clip, strlen(sel.clip));
 279 }
 280
 281 /* TODO: doubleclick to select word */
 282 static void brelease(XEvent *e) {
 283         int b;
 284         sel.mode = 0;
 285         getbuttoninfo(e, &b, &sel.ex, &sel.ey);
 286         if(b==4)
 287                 tscrollup(1);
 288         else
 289         if(b==5)
 290                 tscrolldown(1);
 291         else
 292         if(sel.bx==sel.ex && sel.by==sel.ey) {
 293                 sel.bx = -1;
 294                 if(b==2)
 295                         selpaste();
 296         } else {
 297                 if(b==1)
 298                         selcopy(getseltext());
 299         }
 300         draw(1);
 301 }
 302
 303 static void bmotion(XEvent *e) {
 304         if (sel.mode) {
 305                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 306                 draw(1);
 307         }
 308 }
 309
 310 #ifdef DEBUG
 311 void
 312 tdump(void) {
 313         int row, col;
 314         Glyph c;
 315
 316         for(row = 0; row < term.row; row++) {
 317                 for(col = 0; col < term.col; col++) {
 318                         if(col == term.c.x && row == term.c.y)
 319                                 putchar('#');
 320                         else {
 321                                 c = term.line[row][col];
 322                                 putchar(c.state & GLYPH_SET ? c.c : '.');
 323                         }
 324                 }
 325                 putchar('\n');
 326         }
 327 }
 328 #endif
 329
 330 void
 331 die(const char *errstr, ...) {
 332         va_list ap;
 333
 334         va_start(ap, errstr);
 335         vfprintf(stderr, errstr, ap);
 336         va_end(ap);
 337         exit(EXIT_FAILURE);
 338 }
 339
 340 void
 341 execsh(void) {
 342         char *args[3] = {getenv("SHELL"), "-i", NULL};
 343         DEFAULT(args[0], SHELL); /* if getenv() failed */
 344         putenv("TERM=" TNAME);
 345         execvp(args[0], args);
 346 }
 347
 348 void
 349 sigchld(int a) {
 350         int stat = 0;
 351         if(waitpid(pid, &stat, 0) < 0)
 352                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 353         if(WIFEXITED(stat))
 354                 exit(WEXITSTATUS(stat));
 355         else
 356                 exit(EXIT_FAILURE);
 357 }
 358
 359 void
 360 ttynew(void) {
 361         int m, s;
 362
 363         /* seems to work fine on linux, openbsd and freebsd */
 364         struct winsize w = {term.row, term.col, 0, 0};
 365         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 366                 die("openpty failed: %s\n", SERRNO);
 367
 368         switch(pid = fork()) {
 369         case -1:
 370                 die("fork failed\n");
 371                 break;
 372         case 0:
 373                 setsid(); /* create a new process group */
 374                 dup2(s, STDIN_FILENO);
 375                 dup2(s, STDOUT_FILENO);
 376                 dup2(s, STDERR_FILENO);
 377                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 378                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 379                 close(s);
 380                 close(m);
 381                 execsh();
 382                 break;
 383         default:
 384                 close(s);
 385                 cmdfd = m;
 386                 signal(SIGCHLD, sigchld);
 387         }
 388 }
 389
 390 void
 391 dump(char c) {
 392         static int col;
 393         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 394         if(++col % 10 == 0)
 395                 fprintf(stderr, "\n");
 396 }
 397
 398 void
 399 ttyread(void) {
 400         char buf[BUFSIZ] = {0};
 401         int ret;
 402
 403         if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
 404                 die("Couldn't read from shell: %s\n", SERRNO);
 405         else
 406                 tputs(buf, ret);
 407 }
 408
 409 void
 410 ttywrite(const char *s, size_t n) {
 411         if(write(cmdfd, s, n) == -1)
 412                 die("write error on tty: %s\n", SERRNO);
 413 }
 414
 415 void
 416 ttyresize(int x, int y) {
 417         struct winsize w;
 418
 419         w.ws_row = term.row;
 420         w.ws_col = term.col;
 421         w.ws_xpixel = w.ws_ypixel = 0;
 422         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 423                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 424 }
 425
 426 void
 427 tcursor(int mode) {
 428         static TCursor c;
 429
 430         if(mode == CURSOR_SAVE)
 431                 c = term.c;
 432         else if(mode == CURSOR_LOAD)
 433                 term.c = c, tmoveto(c.x, c.y);
 434 }
 435
 436 void
 437 treset(void) {
 438         term.c = (TCursor){{
 439                 .mode = ATTR_NULL,
 440                 .fg = DefaultFG,
 441                 .bg = DefaultBG
 442         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 443
 444         term.top = 0, term.bot = term.row - 1;
 445         term.mode = MODE_WRAP;
 446         tclearregion(0, 0, term.col-1, term.row-1);
 447 }
 448
 449 void
 450 tnew(int col, int row) {
 451         /* set screen size */
 452         term.row = row, term.col = col;
 453         term.line = malloc(term.row * sizeof(Line));
 454         term.alt  = malloc(term.row * sizeof(Line));
 455         for(row = 0 ; row < term.row; row++) {
 456                 term.line[row] = malloc(term.col * sizeof(Glyph));
 457                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 458         }
 459         /* setup screen */
 460         treset();
 461 }
 462
 463 void
 464 tswapscreen(void) {
 465         Line* tmp = term.line;
 466         term.line = term.alt;
 467         term.alt = tmp;
 468         term.mode ^= MODE_ALTSCREEN;
 469 }
 470
 471 void
 472 tscrolldown (int n) {
 473         int i;
 474         Line temp;
 475
 476         LIMIT(n, 0, term.bot-term.top+1);
 477
 478         for(i = 0; i < n; i++)
 479                 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
 480
 481         for(i = term.bot; i >= term.top+n; i--) {
 482                 temp = term.line[i];
 483                 term.line[i] = term.line[i-n];
 484                 term.line[i-n] = temp;
 485         }
 486 }
 487
 488 void
 489 tscrollup (int n) {
 490         int i;
 491         Line temp;
 492         LIMIT(n, 0, term.bot-term.top+1);
 493
 494         for(i = 0; i < n; i++)
 495                 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
 496
 497         for(i = term.top; i <= term.bot-n; i++) {
 498                  temp = term.line[i];
 499                  term.line[i] = term.line[i+n];
 500                  term.line[i+n] = temp;
 501         }
 502 }
 503
 504 void
 505 tnewline(void) {
 506         int y = term.c.y + 1;
 507         if(y > term.bot)
 508                 tscrollup(1), y = term.bot;
 509         tmoveto(0, y);
 510 }
 511
 512 void
 513 csiparse(void) {
 514         /* int noarg = 1; */
 515         char *p = escseq.buf;
 516
 517         escseq.narg = 0;
 518         if(*p == '?')
 519                 escseq.priv = 1, p++;
 520
 521         while(p < escseq.buf+escseq.len) {
 522                 while(isdigit(*p)) {
 523                         escseq.arg[escseq.narg] *= 10;
 524                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 525                 }
 526                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 527                         escseq.narg++, p++;
 528                 else {
 529                         escseq.mode = *p;
 530                         escseq.narg++;
 531                         return;
 532                 }
 533         }
 534 }
 535
 536 void
 537 tmoveto(int x, int y) {
 538         LIMIT(x, 0, term.col-1);
 539         LIMIT(y, 0, term.row-1);
 540         term.c.state &= ~CURSOR_WRAPNEXT;
 541         term.c.x = x;
 542         term.c.y = y;
 543 }
 544
 545 void
 546 tsetchar(char c) {
 547         term.line[term.c.y][term.c.x] = term.c.attr;
 548         term.line[term.c.y][term.c.x].c = c;
 549         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 550 }
 551
 552 void
 553 tclearregion(int x1, int y1, int x2, int y2) {
 554         int y, temp;
 555
 556         if(x1 > x2)
 557                 temp = x1, x1 = x2, x2 = temp;
 558         if(y1 > y2)
 559                 temp = y1, y1 = y2, y2 = temp;
 560
 561         LIMIT(x1, 0, term.col-1);
 562         LIMIT(x2, 0, term.col-1);
 563         LIMIT(y1, 0, term.row-1);
 564         LIMIT(y2, 0, term.row-1);
 565
 566         for(y = y1; y <= y2; y++)
 567                 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
 568 }
 569
 570 void
 571 tdeletechar(int n) {
 572         int src = term.c.x + n;
 573         int dst = term.c.x;
 574         int size = term.col - src;
 575
 576         if(src >= term.col) {
 577                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 578                 return;
 579         }
 580         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 581         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 582 }
 583
 584 void
 585 tinsertblank(int n) {
 586         int src = term.c.x;
 587         int dst = src + n;
 588         int size = term.col - dst;
 589
 590         if(dst >= term.col) {
 591                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 592                 return;
 593         }
 594         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 595         tclearregion(src, term.c.y, dst - 1, term.c.y);
 596 }
 597
 598 void
 599 tinsertblankline(int n) {
 600         int i;
 601         Line blank;
 602         int bot = term.bot;
 603
 604         if(term.c.y > term.bot)
 605                 bot = term.row - 1;
 606         else if(term.c.y < term.top)
 607                 bot = term.top - 1;
 608         if(term.c.y + n >= bot) {
 609                 tclearregion(0, term.c.y, term.col-1, bot);
 610                 return;
 611         }
 612         for(i = bot; i >= term.c.y+n; i--) {
 613                 /* swap deleted line <-> blanked line */
 614                 blank = term.line[i];
 615                 term.line[i] = term.line[i-n];
 616                 term.line[i-n] = blank;
 617                 /* blank it */
 618                 memset(blank, 0, term.col * sizeof(Glyph));
 619         }
 620 }
 621
 622 void
 623 tdeleteline(int n) {
 624         int i;
 625         Line blank;
 626         int bot = term.bot;
 627
 628         if(term.c.y > term.bot)
 629                 bot = term.row - 1;
 630         else if(term.c.y < term.top)
 631                 bot = term.top - 1;
 632         if(term.c.y + n >= bot) {
 633                 tclearregion(0, term.c.y, term.col-1, bot);
 634                 return;
 635         }
 636         for(i = term.c.y; i <= bot-n; i++) {
 637                 /* swap deleted line <-> blanked line */
 638                 blank = term.line[i];
 639                 term.line[i] = term.line[i+n];
 640                 term.line[i+n] = blank;
 641                 /* blank it */
 642                 memset(blank, 0, term.col * sizeof(Glyph));
 643         }
 644 }
 645
 646 void
 647 tsetattr(int *attr, int l) {
 648         int i;
 649
 650         for(i = 0; i < l; i++) {
 651                 switch(attr[i]) {
 652                 case 0:
 653                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 654                         term.c.attr.fg = DefaultFG;
 655                         term.c.attr.bg = DefaultBG;
 656                         break;
 657                 case 1:
 658                         term.c.attr.mode |= ATTR_BOLD;
 659                         break;
 660                 case 4:
 661                         term.c.attr.mode |= ATTR_UNDERLINE;
 662                         break;
 663                 case 7:
 664                         term.c.attr.mode |= ATTR_REVERSE;
 665                         break;
 666                 case 22:
 667                         term.c.attr.mode &= ~ATTR_BOLD;
 668                         break;
 669                 case 24:
 670                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 671                         break;
 672                 case 27:
 673                         term.c.attr.mode &= ~ATTR_REVERSE;
 674                         break;
 675                 case 38:
 676                         if (i + 2 < l && attr[i + 1] == 5) {
 677                                 i += 2;
 678                                 if (BETWEEN(attr[i], 0, 255))
 679                                         term.c.attr.fg = attr[i];
 680                                 else
 681                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 682                         }
 683                         else
 684                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 685                         break;
 686                 case 39:
 687                         term.c.attr.fg = DefaultFG;
 688                         break;
 689                 case 48:
 690                         if (i + 2 < l && attr[i + 1] == 5) {
 691                                 i += 2;
 692                                 if (BETWEEN(attr[i], 0, 255))
 693                                         term.c.attr.bg = attr[i];
 694                                 else
 695                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 696                         }
 697                         else
 698                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 699                         break;
 700                 case 49:
 701                         term.c.attr.bg = DefaultBG;
 702                         break;
 703                 default:
 704                         if(BETWEEN(attr[i], 30, 37))
 705                                 term.c.attr.fg = attr[i] - 30;
 706                         else if(BETWEEN(attr[i], 40, 47))
 707                                 term.c.attr.bg = attr[i] - 40;
 708                         else if(BETWEEN(attr[i], 90, 97))
 709                                 term.c.attr.fg = attr[i] - 90 + 8;
 710                         else if(BETWEEN(attr[i], 100, 107))
 711                                 term.c.attr.fg = attr[i] - 100 + 8;
 712                         else
 713                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 714                         break;
 715                 }
 716         }
 717 }
 718
 719 void
 720 tsetscroll(int t, int b) {
 721         int temp;
 722
 723         LIMIT(t, 0, term.row-1);
 724         LIMIT(b, 0, term.row-1);
 725         if(t > b) {
 726                 temp = t;
 727                 t = b;
 728                 b = temp;
 729         }
 730         term.top = t;
 731         term.bot = b;
 732 }
 733
 734 void
 735 csihandle(void) {
 736         switch(escseq.mode) {
 737         default:
 738         unknown:
 739                 printf("erresc: unknown csi ");
 740                 csidump();
 741                 /* die(""); */
 742                 break;
 743         case '@': /* ICH -- Insert <n> blank char */
 744                 DEFAULT(escseq.arg[0], 1);
 745                 tinsertblank(escseq.arg[0]);
 746                 break;
 747         case 'A': /* CUU -- Cursor <n> Up */
 748         case 'e':
 749                 DEFAULT(escseq.arg[0], 1);
 750                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 751                 break;
 752         case 'B': /* CUD -- Cursor <n> Down */
 753                 DEFAULT(escseq.arg[0], 1);
 754                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 755                 break;
 756         case 'C': /* CUF -- Cursor <n> Forward */
 757         case 'a':
 758                 DEFAULT(escseq.arg[0], 1);
 759                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 760                 break;
 761         case 'D': /* CUB -- Cursor <n> Backward */
 762                 DEFAULT(escseq.arg[0], 1);
 763                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 764                 break;
 765         case 'E': /* CNL -- Cursor <n> Down and first col */
 766                 DEFAULT(escseq.arg[0], 1);
 767                 tmoveto(0, term.c.y+escseq.arg[0]);
 768                 break;
 769         case 'F': /* CPL -- Cursor <n> Up and first col */
 770                 DEFAULT(escseq.arg[0], 1);
 771                 tmoveto(0, term.c.y-escseq.arg[0]);
 772                 break;
 773         case 'G': /* CHA -- Move to <col> */
 774         case '`': /* XXX: HPA -- same? */
 775                 DEFAULT(escseq.arg[0], 1);
 776                 tmoveto(escseq.arg[0]-1, term.c.y);
 777                 break;
 778         case 'H': /* CUP -- Move to <row> <col> */
 779         case 'f': /* XXX: HVP -- same? */
 780                 DEFAULT(escseq.arg[0], 1);
 781                 DEFAULT(escseq.arg[1], 1);
 782                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 783                 break;
 784         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 785         case 'J': /* ED -- Clear screen */
 786                 switch(escseq.arg[0]) {
 787                 case 0: /* below */
 788                         tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
 789                         break;
 790                 case 1: /* above */
 791                         tclearregion(0, 0, term.c.x, term.c.y);
 792                         break;
 793                 case 2: /* all */
 794                         tclearregion(0, 0, term.col-1, term.row-1);
 795                         break;
 796                 default:
 797                         goto unknown;
 798                 }
 799                 break;
 800         case 'K': /* EL -- Clear line */
 801                 switch(escseq.arg[0]) {
 802                 case 0: /* right */
 803                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 804                         break;
 805                 case 1: /* left */
 806                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 807                         break;
 808                 case 2: /* all */
 809                         tclearregion(0, term.c.y, term.col-1, term.c.y);
 810                         break;
 811                 }
 812                 break;
 813         case 'S': /* SU -- Scroll <n> line up */
 814                 DEFAULT(escseq.arg[0], 1);
 815                 tscrollup(escseq.arg[0]);
 816                 break;
 817         case 'T': /* SD -- Scroll <n> line down */
 818                 DEFAULT(escseq.arg[0], 1);
 819                 tscrolldown(escseq.arg[0]);
 820                 break;
 821         case 'L': /* IL -- Insert <n> blank lines */
 822                 DEFAULT(escseq.arg[0], 1);
 823                 tinsertblankline(escseq.arg[0]);
 824                 break;
 825         case 'l': /* RM -- Reset Mode */
 826                 if(escseq.priv) {
 827                         switch(escseq.arg[0]) {
 828                         case 1:
 829                                 term.mode &= ~MODE_APPKEYPAD;
 830                                 break;
 831                         case 7:
 832                                 term.mode &= ~MODE_WRAP;
 833                                 break;
 834                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
 835                                 break;
 836                         case 25:
 837                                 term.c.state |= CURSOR_HIDE;
 838                                 break;
 839                         case 1049: /* = 1047 and 1048 */
 840                         case 1047:
 841                                 if(IS_SET(MODE_ALTSCREEN)) {
 842                                         tclearregion(0, 0, term.col-1, term.row-1);
 843                                         tswapscreen();
 844                                 }
 845                                 if(escseq.arg[0] == 1047)
 846                                         break;
 847                         case 1048:
 848                                 tcursor(CURSOR_LOAD);
 849                                 break;
 850                         default:
 851                                 goto unknown;
 852                         }
 853                 } else {
 854                         switch(escseq.arg[0]) {
 855                         case 4:
 856                                 term.mode &= ~MODE_INSERT;
 857                                 break;
 858                         default:
 859                                 goto unknown;
 860                         }
 861                 }
 862                 break;
 863         case 'M': /* DL -- Delete <n> lines */
 864                 DEFAULT(escseq.arg[0], 1);
 865                 tdeleteline(escseq.arg[0]);
 866                 break;
 867         case 'X': /* ECH -- Erase <n> char */
 868                 DEFAULT(escseq.arg[0], 1);
 869                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
 870                 break;
 871         case 'P': /* DCH -- Delete <n> char */
 872                 DEFAULT(escseq.arg[0], 1);
 873                 tdeletechar(escseq.arg[0]);
 874                 break;
 875         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
 876         case 'd': /* VPA -- Move to <row> */
 877                 DEFAULT(escseq.arg[0], 1);
 878                 tmoveto(term.c.x, escseq.arg[0]-1);
 879                 break;
 880         case 'h': /* SM -- Set terminal mode */
 881                 if(escseq.priv) {
 882                         switch(escseq.arg[0]) {
 883                         case 1:
 884                                 term.mode |= MODE_APPKEYPAD;
 885                                 break;
 886                         case 7:
 887                                 term.mode |= MODE_WRAP;
 888                                 break;
 889                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
 890                                 break;
 891                         case 25:
 892                                 term.c.state &= ~CURSOR_HIDE;
 893                                 break;
 894                         case 1049: /* = 1047 and 1048 */
 895                         case 1047:
 896                                 if(IS_SET(MODE_ALTSCREEN))
 897                                         tclearregion(0, 0, term.col-1, term.row-1);
 898                                 else
 899                                         tswapscreen();
 900                                 if(escseq.arg[0] == 1047)
 901                                         break;
 902                         case 1048:
 903                                 tcursor(CURSOR_SAVE);
 904                                 break;
 905                         default: goto unknown;
 906                         }
 907                 } else {
 908                         switch(escseq.arg[0]) {
 909                         case 4:
 910                                 term.mode |= MODE_INSERT;
 911                                 break;
 912                         default: goto unknown;
 913                         }
 914                 };
 915                 break;
 916         case 'm': /* SGR -- Terminal attribute (color) */
 917                 tsetattr(escseq.arg, escseq.narg);
 918                 break;
 919         case 'r': /* DECSTBM -- Set Scrolling Region */
 920                 if(escseq.priv)
 921                         goto unknown;
 922                 else {
 923                         DEFAULT(escseq.arg[0], 1);
 924                         DEFAULT(escseq.arg[1], term.row);
 925                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
 926                         tmoveto(0, 0);
 927                 }
 928                 break;
 929         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
 930                 tcursor(CURSOR_SAVE);
 931                 break;
 932         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 933                 tcursor(CURSOR_LOAD);
 934                 break;
 935         }
 936 }
 937
 938 void
 939 csidump(void) {
 940         int i;
 941         printf("ESC [ %s", escseq.priv ? "? " : "");
 942         if(escseq.narg)
 943                 for(i = 0; i < escseq.narg; i++)
 944                         printf("%d ", escseq.arg[i]);
 945         if(escseq.mode)
 946                 putchar(escseq.mode);
 947         putchar('\n');
 948 }
 949
 950 void
 951 csireset(void) {
 952         memset(&escseq, 0, sizeof(escseq));
 953 }
 954
 955 void
 956 tputtab(void) {
 957         int space = TAB - term.c.x % TAB;
 958         tmoveto(term.c.x + space, term.c.y);
 959 }
 960
 961 void
 962 tputc(char c) {
 963         if(term.esc & ESC_START) {
 964                 if(term.esc & ESC_CSI) {
 965                         escseq.buf[escseq.len++] = c;
 966                         if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
 967                                 term.esc = 0;
 968                                 csiparse(), csihandle();
 969                         }
 970                 } else if(term.esc & ESC_OSC) {
 971                         if(c == ';') {
 972                                 term.titlelen = 0;
 973                                 term.esc = ESC_START | ESC_TITLE;
 974                         }
 975                 } else if(term.esc & ESC_TITLE) {
 976                         if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
 977                                 term.esc = 0;
 978                                 term.title[term.titlelen] = '\0';
 979                                 XStoreName(xw.dis, xw.win, term.title);
 980                         } else {
 981                                 term.title[term.titlelen++] = c;
 982                         }
 983                 } else if(term.esc & ESC_ALTCHARSET) {
 984                         switch(c) {
 985                         case '0': /* Line drawing crap */
 986                                 term.c.attr.mode |= ATTR_GFX;
 987                                 break;
 988                         case 'B': /* Back to regular text */
 989                                 term.c.attr.mode &= ~ATTR_GFX;
 990                                 break;
 991                         default:
 992                                 printf("esc unhandled charset: ESC ( %c\n", c);
 993                         }
 994                         term.esc = 0;
 995                 } else {
 996                         switch(c) {
 997                         case '[':
 998                                 term.esc |= ESC_CSI;
 999                                 break;
1000                         case ']':
1001                                 term.esc |= ESC_OSC;
1002                                 break;
1003                         case '(':
1004                                 term.esc |= ESC_ALTCHARSET;
1005                                 break;
1006                         case 'D': /* IND -- Linefeed */
1007                                 if(term.c.y == term.bot)
1008                                         tscrollup(1);
1009                                 else
1010                                         tmoveto(term.c.x, term.c.y+1);
1011                                 term.esc = 0;
1012                                 break;
1013                         case 'E': /* NEL -- Next line */
1014                                 tnewline();
1015                                 term.esc = 0;
1016                                 break;
1017                         case 'M': /* RI -- Reverse index */
1018                                 if(term.c.y == term.top)
1019                                         tscrolldown(1);
1020                                 else
1021                                         tmoveto(term.c.x, term.c.y-1);
1022                                 term.esc = 0;
1023                                 break;
1024                         case 'c': /* RIS -- Reset to inital state */
1025                                 treset();
1026                                 term.esc = 0;
1027                                 break;
1028                         case '=': /* DECPAM -- Application keypad */
1029                                 term.mode |= MODE_APPKEYPAD;
1030                                 term.esc = 0;
1031                                 break;
1032                         case '>': /* DECPNM -- Normal keypad */
1033                                 term.mode &= ~MODE_APPKEYPAD;
1034                                 term.esc = 0;
1035                                 break;
1036                         case '7': /* DECSC -- Save Cursor */
1037                                 tcursor(CURSOR_SAVE);
1038                                 term.esc = 0;
1039                                 break;
1040                         case '8': /* DECRC -- Restore Cursor */
1041                                 tcursor(CURSOR_LOAD);
1042                                 term.esc = 0;
1043                                 break;
1044                         default:
1045                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
1046                                 term.esc = 0;
1047                         }
1048                 }
1049         } else {
1050                 switch(c) {
1051                 case '\t':
1052                         tputtab();
1053                         break;
1054                 case '\b':
1055                         tmoveto(term.c.x-1, term.c.y);
1056                         break;
1057                 case '\r':
1058                         tmoveto(0, term.c.y);
1059                         break;
1060                 case '\n':
1061                         tnewline();
1062                         break;
1063                 case '\a':
1064                         if(!xw.hasfocus)
1065                                 xseturgency(1);
1066                         break;
1067                 case '\033':
1068                         csireset();
1069                         term.esc = ESC_START;
1070                         break;
1071                 default:
1072                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1073                                 tnewline();
1074                         tsetchar(c);
1075                         if(term.c.x+1 < term.col)
1076                                 tmoveto(term.c.x+1, term.c.y);
1077                         else
1078                                 term.c.state |= CURSOR_WRAPNEXT;
1079                         break;
1080                 }
1081         }
1082 }
1083
1084 void
1085 tputs(char *s, int len) {
1086         for(; len > 0; len--)
1087                 tputc(*s++);
1088 }
1089
1090 void
1091 tresize(int col, int row) {
1092         int i;
1093         int minrow = MIN(row, term.row);
1094         int mincol = MIN(col, term.col);
1095
1096         if(col < 1 || row < 1)
1097                 return;
1098
1099         /* free uneeded rows */
1100         for(i = row; i < term.row; i++) {
1101                 free(term.line[i]);
1102                 free(term.alt[i]);
1103         }
1104
1105         /* resize to new height */
1106         term.line = realloc(term.line, row * sizeof(Line));
1107         term.alt  = realloc(term.alt,  row * sizeof(Line));
1108
1109         /* resize each row to new width, zero-pad if needed */
1110         for(i = 0; i < minrow; i++) {
1111                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1112                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1113                 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1114                 memset(term.alt[i]  + mincol, 0, (col - mincol) * sizeof(Glyph));
1115         }
1116
1117         /* allocate any new rows */
1118         for(/* i == minrow */; i < row; i++) {
1119                 term.line[i] = calloc(col, sizeof(Glyph));
1120                 term.alt [i] = calloc(col, sizeof(Glyph));
1121         }
1122
1123         /* update terminal size */
1124         term.col = col, term.row = row;
1125         /* make use of the LIMIT in tmoveto */
1126         tmoveto(term.c.x, term.c.y);
1127         /* reset scrolling region */
1128         tsetscroll(0, row-1);
1129 }
1130
1131 void
1132 xloadcols(void) {
1133         int i, r, g, b;
1134         XColor color;
1135         Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1136         unsigned long white = WhitePixel(xw.dis, xw.scr);
1137
1138         for(i = 0; i < 16; i++) {
1139                 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1140                         dc.col[i] = white;
1141                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1142                 } else
1143                         dc.col[i] = color.pixel;
1144         }
1145
1146         /* same colors as xterm */
1147         for(r = 0; r < 6; r++)
1148                 for(g = 0; g < 6; g++)
1149                         for(b = 0; b < 6; b++) {
1150                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1151                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1152                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1153                                 if (!XAllocColor(xw.dis, cmap, &color)) {
1154                                         dc.col[i] = white;
1155                                         fprintf(stderr, "Could not allocate color %d\n", i);
1156                                 } else
1157                                         dc.col[i] = color.pixel;
1158                                 i++;
1159                         }
1160
1161         for(r = 0; r < 24; r++, i++) {
1162                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1163                 if (!XAllocColor(xw.dis, cmap, &color)) {
1164                         dc.col[i] = white;
1165                         fprintf(stderr, "Could not allocate color %d\n", i);
1166                 } else
1167                         dc.col[i] = color.pixel;
1168         }
1169 }
1170
1171 void
1172 xclear(int x1, int y1, int x2, int y2) {
1173         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1174         XFillRectangle(xw.dis, xw.buf, dc.gc,
1175                        x1 * xw.cw, y1 * xw.ch,
1176                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1177 }
1178
1179 void
1180 xhints(void)
1181 {
1182         XClassHint class = {TNAME, TNAME};
1183         XWMHints wm = {.flags = InputHint, .input = 1};
1184         XSizeHints size = {
1185                 .flags = PSize | PResizeInc | PBaseSize,
1186                 .height = xw.h,
1187                 .width = xw.w,
1188                 .height_inc = xw.ch,
1189                 .width_inc = xw.cw,
1190                 .base_height = 2*BORDER,
1191                 .base_width = 2*BORDER,
1192         };
1193         XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1194 }
1195
1196 void
1197 xinit(void) {
1198         if(!(xw.dis = XOpenDisplay(NULL)))
1199                 die("Can't open display\n");
1200         xw.scr = XDefaultScreen(xw.dis);
1201
1202         /* font */
1203         if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1204                 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1205
1206         /* XXX: Assuming same size for bold font */
1207         xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1208         xw.ch = dc.font->ascent + dc.font->descent;
1209
1210         /* colors */
1211         xloadcols();
1212
1213         /* windows */
1214         xw.h = term.row * xw.ch + 2*BORDER;
1215         xw.w = term.col * xw.cw + 2*BORDER;
1216         xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1217                         xw.w, xw.h, 0,
1218                         dc.col[DefaultBG],
1219                         dc.col[DefaultBG]);
1220         xw.bufw = xw.w - 2*BORDER;
1221         xw.bufh = xw.h - 2*BORDER;
1222         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1223         /* gc */
1224         dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1225
1226         /* event mask */
1227         XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask
1228                 | StructureNotifyMask | FocusChangeMask | PointerMotionMask
1229                 | ButtonPressMask | ButtonReleaseMask);
1230
1231         XMapWindow(xw.dis, xw.win);
1232         xhints();
1233         XStoreName(xw.dis, xw.win, "st");
1234         XSync(xw.dis, 0);
1235 }
1236
1237 void
1238 xdraws(char *s, Glyph base, int x, int y, int len) {
1239         unsigned long xfg, xbg;
1240         int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1241         int i;
1242
1243         if(base.mode & ATTR_REVERSE)
1244                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1245         else
1246                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1247
1248         XSetBackground(xw.dis, dc.gc, xbg);
1249         XSetForeground(xw.dis, dc.gc, xfg);
1250
1251         if(base.mode & ATTR_GFX)
1252                 for(i = 0; i < len; i++)
1253                         s[i] = gfx[(int)s[i]];
1254
1255         XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1256         XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1257
1258         if(base.mode & ATTR_UNDERLINE)
1259                 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1260 }
1261
1262 void
1263 xdrawcursor(void) {
1264         static int oldx = 0;
1265         static int oldy = 0;
1266         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1267
1268         LIMIT(oldx, 0, term.col-1);
1269         LIMIT(oldy, 0, term.row-1);
1270
1271         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1272                 g.c = term.line[term.c.y][term.c.x].c;
1273
1274         /* remove the old cursor */
1275         if(term.line[oldy][oldx].state & GLYPH_SET)
1276                 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1277         else
1278                 xclear(oldx, oldy, oldx, oldy);
1279
1280         /* draw the new one */
1281         if(!(term.c.state & CURSOR_HIDE) && xw.hasfocus) {
1282                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1283                 oldx = term.c.x, oldy = term.c.y;
1284         }
1285 }
1286
1287 #ifdef DEBUG
1288 /* basic drawing routines */
1289 void
1290 xdrawc(int x, int y, Glyph g) {
1291         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1292         XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1293         XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1294         XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1295         XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1296 }
1297
1298 void
1299 draw(int dummy) {
1300         int x, y;
1301
1302         xclear(0, 0, term.col-1, term.row-1);
1303         for(y = 0; y < term.row; y++)
1304                 for(x = 0; x < term.col; x++)
1305                         if(term.line[y][x].state & GLYPH_SET)
1306                                 xdrawc(x, y, term.line[y][x]);
1307
1308         xdrawcursor();
1309         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1310         XFlush(xw.dis);
1311 }
1312
1313 #else
1314 /* optimized drawing routine */
1315 void
1316 draw(int redraw_all) {
1317         int i, x, y, ox;
1318         Glyph base, new;
1319         char buf[DRAW_BUF_SIZ];
1320
1321         XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1322         XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.bufw, xw.bufh);
1323         for(y = 0; y < term.row; y++) {
1324                 base = term.line[y][0];
1325                 i = ox = 0;
1326                 for(x = 0; x < term.col; x++) {
1327                         new = term.line[y][x];
1328                         if(sel.bx!=-1 && new.c && selected(x, y))
1329                                 new.mode ^= ATTR_REVERSE;
1330                         if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1331                                         i >= DRAW_BUF_SIZ)) {
1332                                 xdraws(buf, base, ox, y, i);
1333                                 i = 0;
1334                         }
1335                         if(new.state & GLYPH_SET) {
1336                                 if(i == 0) {
1337                                         ox = x;
1338                                         base = new;
1339                                 }
1340                                 buf[i++] = new.c;
1341                         }
1342                 }
1343                 if(i > 0)
1344                         xdraws(buf, base, ox, y, i);
1345         }
1346         xdrawcursor();
1347         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1348         XFlush(xw.dis);
1349 }
1350
1351 #endif
1352
1353 void
1354 expose(XEvent *ev) {
1355         draw(SCREEN_REDRAW);
1356 }
1357
1358 void
1359 xseturgency(int add) {
1360         XWMHints *h = XGetWMHints(xw.dis, xw.win);
1361         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1362         XSetWMHints(xw.dis, xw.win, h);
1363         XFree(h);
1364 }
1365
1366 void
1367 focus(XEvent *ev) {
1368         if((xw.hasfocus = ev->type == FocusIn))
1369                 xseturgency(0);
1370         draw(SCREEN_UPDATE);
1371 }
1372
1373 char*
1374 kmap(KeySym k) {
1375         int i;
1376         for(i = 0; i < LEN(key); i++)
1377                 if(key[i].k == k)
1378                         return (char*)key[i].s;
1379         return NULL;
1380 }
1381
1382 void
1383 kpress(XEvent *ev) {
1384         XKeyEvent *e = &ev->xkey;
1385         KeySym ksym;
1386         char buf[32];
1387         char *customkey;
1388         int len;
1389         int meta;
1390         int shift;
1391
1392         meta = e->state & Mod1Mask;
1393         shift = e->state & ShiftMask;
1394         len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1395
1396         if((customkey = kmap(ksym)))
1397                 ttywrite(customkey, strlen(customkey));
1398         else if(len > 0) {
1399                 buf[sizeof(buf)-1] = '\0';
1400                 if(meta && len == 1)
1401                         ttywrite("\033", 1);
1402                 ttywrite(buf, len);
1403         } else
1404                 switch(ksym) {
1405                 case XK_Up:
1406                 case XK_Down:
1407                 case XK_Left:
1408                 case XK_Right:
1409                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1410                         ttywrite(buf, 3);
1411                         break;
1412                 case XK_Insert:
1413                         if(shift)
1414                                 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1415                         break;
1416                 default:
1417                         fprintf(stderr, "errkey: %d\n", (int)ksym);
1418                         break;
1419                 }
1420 }
1421
1422 void
1423 resize(XEvent *e) {
1424         int col, row;
1425
1426         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1427                 return;
1428
1429         xw.w = e->xconfigure.width;
1430         xw.h = e->xconfigure.height;
1431         xw.bufw = xw.w - 2*BORDER;
1432         xw.bufh = xw.h - 2*BORDER;
1433         col = xw.bufw / xw.cw;
1434         row = xw.bufh / xw.ch;
1435         tresize(col, row);
1436         ttyresize(col, row);
1437         xw.bufh = MAX(1, xw.bufh);
1438         xw.bufw = MAX(1, xw.bufw);
1439         XFreePixmap(xw.dis, xw.buf);
1440         xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1441         draw(SCREEN_REDRAW);
1442 }
1443
1444 void
1445 run(void) {
1446         XEvent ev;
1447         fd_set rfd;
1448         int xfd = XConnectionNumber(xw.dis);
1449
1450         for(;;) {
1451                 FD_ZERO(&rfd);
1452                 FD_SET(cmdfd, &rfd);
1453                 FD_SET(xfd, &rfd);
1454                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1455                         if(errno == EINTR)
1456                                 continue;
1457                         die("select failed: %s\n", SERRNO);
1458                 }
1459                 if(FD_ISSET(cmdfd, &rfd)) {
1460                         ttyread();
1461                         draw(SCREEN_UPDATE);
1462                 }
1463                 while(XPending(xw.dis)) {
1464                         XNextEvent(xw.dis, &ev);
1465                         if(handler[ev.type])
1466                                 (handler[ev.type])(&ev);
1467                 }
1468         }
1469 }
1470
1471 int
1472 main(int argc, char *argv[]) {
1473         if(argc == 2 && !strncmp("-v", argv[1], 3))
1474                 die("st-" VERSION ", (c) 2010 st engineers\n");
1475         else if(argc != 1)
1476                 die("usage: st [-v]\n");
1477         setlocale(LC_CTYPE, "");
1478         tnew(80, 24);
1479         ttynew();
1480         xinit();
1481         selinit();
1482         run();
1483         return 0;
1484 }