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 <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/extensions/Xdbe.h>
  28 #include <X11/Xft/Xft.h>
  29 #include <fontconfig/fontconfig.h>
  30 #define Glyph Glyph_
  31 #define Font Font_
  32
  33 #if   defined(__linux)
  34  #include <pty.h>
  35 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  36  #include <util.h>
  37 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  38  #include <libutil.h>
  39 #endif
  40
  41 #define USAGE \
  42         "st " VERSION " (c) 2010-2012 st engineers\n" \
  43         "usage: st [-v] [-c class] [-f font] [-g geometry] [-o file]" \
  44         " [-t title] [-w windowid] [-e command ...]\n"
  45
  46 /* XEMBED messages */
  47 #define XEMBED_FOCUS_IN  4
  48 #define XEMBED_FOCUS_OUT 5
  49
  50 /* Arbitrary sizes */
  51 #define ESC_BUF_SIZ   256
  52 #define ESC_ARG_SIZ   16
  53 #define STR_BUF_SIZ   256
  54 #define STR_ARG_SIZ   16
  55 #define DRAW_BUF_SIZ  20*1024
  56 #define UTF_SIZ       4
  57 #define XK_NO_MOD     UINT_MAX
  58 #define XK_ANY_MOD    0
  59
  60 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  61
  62 #define SERRNO strerror(errno)
  63 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  64 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  65 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  66 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  67 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  68 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  69 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  70 #define IS_SET(flag) (term.mode & (flag))
  71 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  72 #define X2COL(x) (((x) - BORDER)/xw.cw)
  73 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  74
  75 enum glyph_attribute {
  76         ATTR_NULL      = 0,
  77         ATTR_REVERSE   = 1,
  78         ATTR_UNDERLINE = 2,
  79         ATTR_BOLD      = 4,
  80         ATTR_GFX       = 8,
  81         ATTR_ITALIC    = 16,
  82         ATTR_BLINK     = 32,
  83 };
  84
  85 enum cursor_movement {
  86         CURSOR_UP,
  87         CURSOR_DOWN,
  88         CURSOR_LEFT,
  89         CURSOR_RIGHT,
  90         CURSOR_SAVE,
  91         CURSOR_LOAD
  92 };
  93
  94 enum cursor_state {
  95         CURSOR_DEFAULT  = 0,
  96         CURSOR_HIDE     = 1,
  97         CURSOR_WRAPNEXT = 2
  98 };
  99
 100 enum glyph_state {
 101         GLYPH_SET   = 1,
 102         GLYPH_DIRTY = 2
 103 };
 104
 105 enum term_mode {
 106         MODE_WRAP       = 1,
 107         MODE_INSERT      = 2,
 108         MODE_APPKEYPAD   = 4,
 109         MODE_ALTSCREEN   = 8,
 110         MODE_CRLF       = 16,
 111         MODE_MOUSEBTN    = 32,
 112         MODE_MOUSEMOTION = 64,
 113         MODE_MOUSE       = 32|64,
 114         MODE_REVERSE     = 128,
 115         MODE_KBDLOCK     = 256
 116 };
 117
 118 enum escape_state {
 119         ESC_START      = 1,
 120         ESC_CSI = 2,
 121         ESC_STR = 4, /* DSC, OSC, PM, APC */
 122         ESC_ALTCHARSET = 8,
 123         ESC_STR_END    = 16, /* a final string was encountered */
 124 };
 125
 126 enum window_state {
 127         WIN_VISIBLE = 1,
 128         WIN_REDRAW  = 2,
 129         WIN_FOCUSED = 4
 130 };
 131
 132 /* bit macro */
 133 #undef B0
 134 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 135
 136 typedef unsigned char uchar;
 137 typedef unsigned int uint;
 138 typedef unsigned long ulong;
 139 typedef unsigned short ushort;
 140
 141 typedef struct {
 142         char c[UTF_SIZ];     /* character code */
 143         uchar mode;  /* attribute flags */
 144         ushort fg;   /* foreground  */
 145         ushort bg;   /* background  */
 146         uchar state; /* state flags    */
 147 } Glyph;
 148
 149 typedef Glyph* Line;
 150
 151 typedef struct {
 152         Glyph attr;      /* current char attributes */
 153         int x;
 154         int y;
 155         char state;
 156 } TCursor;
 157
 158 /* CSI Escape sequence structs */
 159 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 160 typedef struct {
 161         char buf[ESC_BUF_SIZ]; /* raw string */
 162         int len;               /* raw string length */
 163         char priv;
 164         int arg[ESC_ARG_SIZ];
 165         int narg;             /* nb of args */
 166         char mode;
 167 } CSIEscape;
 168
 169 /* STR Escape sequence structs */
 170 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 171 typedef struct {
 172         char type;           /* ESC type ... */
 173         char buf[STR_BUF_SIZ]; /* raw string */
 174         int len;               /* raw string length */
 175         char *args[STR_ARG_SIZ];
 176         int narg;             /* nb of args */
 177 } STREscape;
 178
 179 /* Internal representation of the screen */
 180 typedef struct {
 181         int row;        /* nb row */
 182         int col;        /* nb col */
 183         Line *line;     /* screen */
 184         Line *alt;      /* alternate screen */
 185         bool *dirty;    /* dirtyness of lines */
 186         TCursor c;      /* cursor */
 187         int top;        /* top    scroll limit */
 188         int bot;        /* bottom scroll limit */
 189         int mode;       /* terminal mode flags */
 190         int esc;        /* escape state flags */
 191         bool *tabs;
 192 } Term;
 193
 194 /* Purely graphic info */
 195 typedef struct {
 196         Display* dpy;
 197         Colormap cmap;
 198         Window win;
 199         XdbeBackBuffer buf;
 200         Atom xembed, wmdeletewin;
 201         XIM xim;
 202         XIC xic;
 203         XftDraw *xft_draw;
 204         Visual *vis;
 205         int scr;
 206         bool isfixed; /* is fixed geometry? */
 207         int fx, fy, fw, fh; /* fixed geometry */
 208         int tw, th; /* tty width and height */
 209         int w;  /* window width */
 210         int h;  /* window height */
 211         int ch; /* char height */
 212         int cw; /* char width  */
 213         char state; /* focus, redraw, visible */
 214 } XWindow;
 215
 216 typedef struct {
 217         KeySym k;
 218         uint mask;
 219         char s[ESC_BUF_SIZ];
 220 } Key;
 221
 222 /* TODO: use better name for vars... */
 223 typedef struct {
 224         int mode;
 225         int bx, by;
 226         int ex, ey;
 227         struct {
 228                 int x, y;
 229         } b, e;
 230         char *clip;
 231         Atom xtarget;
 232         bool alt;
 233         struct timeval tclick1;
 234         struct timeval tclick2;
 235 } Selection;
 236
 237 #include "config.h"
 238
 239 /* Font structure */
 240 typedef struct {
 241         int height;
 242         int width;
 243         int ascent;
 244         int descent;
 245         short lbearing;
 246         short rbearing;
 247         XftFont *xft_set;
 248 } Font;
 249
 250 /* Drawing Context */
 251 typedef struct {
 252         XftColor xft_col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 253         GC gc;
 254         Font font, bfont, ifont, ibfont;
 255 } DC;
 256
 257 static void die(const char *, ...);
 258 static void draw(void);
 259 static void redraw(void);
 260 static void drawregion(int, int, int, int);
 261 static void execsh(void);
 262 static void sigchld(int);
 263 static void run(void);
 264
 265 static void csidump(void);
 266 static void csihandle(void);
 267 static void csiparse(void);
 268 static void csireset(void);
 269 static void strdump(void);
 270 static void strhandle(void);
 271 static void strparse(void);
 272 static void strreset(void);
 273
 274 static void tclearregion(int, int, int, int);
 275 static void tcursor(int);
 276 static void tdeletechar(int);
 277 static void tdeleteline(int);
 278 static void tinsertblank(int);
 279 static void tinsertblankline(int);
 280 static void tmoveto(int, int);
 281 static void tnew(int, int);
 282 static void tnewline(int);
 283 static void tputtab(bool);
 284 static void tputc(char *, int);
 285 static void treset(void);
 286 static int tresize(int, int);
 287 static void tscrollup(int, int);
 288 static void tscrolldown(int, int);
 289 static void tsetattr(int*, int);
 290 static void tsetchar(char*);
 291 static void tsetscroll(int, int);
 292 static void tswapscreen(void);
 293 static void tsetdirt(int, int);
 294 static void tsetmode(bool, bool, int *, int);
 295 static void tfulldirt(void);
 296
 297 static void ttynew(void);
 298 static void ttyread(void);
 299 static void ttyresize(void);
 300 static void ttywrite(const char *, size_t);
 301
 302 static void xdraws(char *, Glyph, int, int, int, int);
 303 static void xhints(void);
 304 static void xclear(int, int, int, int);
 305 static void xdrawcursor(void);
 306 static void xinit(void);
 307 static void xloadcols(void);
 308 static void xresettitle(void);
 309 static void xseturgency(int);
 310 static void xsetsel(char*);
 311 static void xtermclear(int, int, int, int);
 312 static void xresize(int, int);
 313
 314 static void expose(XEvent *);
 315 static void visibility(XEvent *);
 316 static void unmap(XEvent *);
 317 static char *kmap(KeySym, uint);
 318 static void kpress(XEvent *);
 319 static void cmessage(XEvent *);
 320 static void resize(XEvent *);
 321 static void focus(XEvent *);
 322 static void brelease(XEvent *);
 323 static void bpress(XEvent *);
 324 static void bmotion(XEvent *);
 325 static void selnotify(XEvent *);
 326 static void selclear(XEvent *);
 327 static void selrequest(XEvent *);
 328
 329 static void selinit(void);
 330 static inline bool selected(int, int);
 331 static void selcopy(void);
 332 static void selpaste(void);
 333 static void selscroll(int, int);
 334
 335 static int utf8decode(char *, long *);
 336 static int utf8encode(long *, char *);
 337 static int utf8size(char *);
 338 static int isfullutf8(char *, int);
 339
 340 static void *xmalloc(size_t);
 341 static void *xrealloc(void *, size_t);
 342 static void *xcalloc(size_t nmemb, size_t size);
 343 static char *smstrcat(char *, ...);
 344
 345 static void (*handler[LASTEvent])(XEvent *) = {
 346         [KeyPress] = kpress,
 347         [ClientMessage] = cmessage,
 348         [ConfigureNotify] = resize,
 349         [VisibilityNotify] = visibility,
 350         [UnmapNotify] = unmap,
 351         [Expose] = expose,
 352         [FocusIn] = focus,
 353         [FocusOut] = focus,
 354         [MotionNotify] = bmotion,
 355         [ButtonPress] = bpress,
 356         [ButtonRelease] = brelease,
 357         [SelectionClear] = selclear,
 358         [SelectionNotify] = selnotify,
 359         [SelectionRequest] = selrequest,
 360 };
 361
 362 /* Globals */
 363 static DC dc;
 364 static XWindow xw;
 365 static Term term;
 366 static CSIEscape csiescseq;
 367 static STREscape strescseq;
 368 static int cmdfd;
 369 static pid_t pid;
 370 static Selection sel;
 371 static int iofd = -1;
 372 static char **opt_cmd = NULL;
 373 static char *opt_io = NULL;
 374 static char *opt_title = NULL;
 375 static char *opt_embed = NULL;
 376 static char *opt_class = NULL;
 377 static char *opt_font = NULL;
 378
 379 void *
 380 xmalloc(size_t len) {
 381         void *p = malloc(len);
 382
 383         if(!p)
 384                 die("Out of memory\n");
 385
 386         return p;
 387 }
 388
 389 void *
 390 xrealloc(void *p, size_t len) {
 391         if((p = realloc(p, len)) == NULL)
 392                 die("Out of memory\n");
 393
 394         return p;
 395 }
 396
 397 void *
 398 xcalloc(size_t nmemb, size_t size) {
 399         void *p = calloc(nmemb, size);
 400
 401         if(!p)
 402                 die("Out of memory\n");
 403
 404         return p;
 405 }
 406
 407 char *
 408 smstrcat(char *src, ...)
 409 {
 410         va_list fmtargs;
 411         char *ret, *p, *v;
 412         int len, slen, flen;
 413
 414         len = slen = strlen(src);
 415
 416         va_start(fmtargs, src);
 417         for(;;) {
 418                 v = va_arg(fmtargs, char *);
 419                 if(v == NULL)
 420                         break;
 421                 len += strlen(v);
 422         }
 423         va_end(fmtargs);
 424
 425         p = ret = xmalloc(len+1);
 426         memmove(p, src, slen);
 427         p += slen;
 428
 429         va_start(fmtargs, src);
 430         for(;;) {
 431                 v = va_arg(fmtargs, char *);
 432                 if(v == NULL)
 433                         break;
 434                 flen = strlen(v);
 435                 memmove(p, v, flen);
 436                 p += flen;
 437         }
 438         va_end(fmtargs);
 439
 440         ret[len] = '\0';
 441
 442         return ret;
 443 }
 444
 445 int
 446 utf8decode(char *s, long *u) {
 447         uchar c;
 448         int i, n, rtn;
 449
 450         rtn = 1;
 451         c = *s;
 452         if(~c & B7) { /* 0xxxxxxx */
 453                 *u = c;
 454                 return rtn;
 455         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 456                 *u = c&(B4|B3|B2|B1|B0);
 457                 n = 1;
 458         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 459                 *u = c&(B3|B2|B1|B0);
 460                 n = 2;
 461         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 462                 *u = c & (B2|B1|B0);
 463                 n = 3;
 464         } else {
 465                 goto invalid;
 466         }
 467
 468         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 469                 c = *s;
 470                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 471                         goto invalid;
 472                 *u <<= 6;
 473                 *u |= c & (B5|B4|B3|B2|B1|B0);
 474         }
 475
 476         if((n == 1 && *u < 0x80) ||
 477            (n == 2 && *u < 0x800) ||
 478            (n == 3 && *u < 0x10000) ||
 479            (*u >= 0xD800 && *u <= 0xDFFF)) {
 480                 goto invalid;
 481         }
 482
 483         return rtn;
 484 invalid:
 485         *u = 0xFFFD;
 486
 487         return rtn;
 488 }
 489
 490 int
 491 utf8encode(long *u, char *s) {
 492         uchar *sp;
 493         ulong uc;
 494         int i, n;
 495
 496         sp = (uchar *)s;
 497         uc = *u;
 498         if(uc < 0x80) {
 499                 *sp = uc; /* 0xxxxxxx */
 500                 return 1;
 501         } else if(*u < 0x800) {
 502                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 503                 n = 1;
 504         } else if(uc < 0x10000) {
 505                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 506                 n = 2;
 507         } else if(uc <= 0x10FFFF) {
 508                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 509                 n = 3;
 510         } else {
 511                 goto invalid;
 512         }
 513
 514         for(i=n,++sp; i>0; --i,++sp)
 515                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 516
 517         return n+1;
 518 invalid:
 519         /* U+FFFD */
 520         *s++ = '\xEF';
 521         *s++ = '\xBF';
 522         *s = '\xBD';
 523
 524         return 3;
 525 }
 526
 527 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 528    UTF-8 otherwise return 0 */
 529 int
 530 isfullutf8(char *s, int b) {
 531         uchar *c1, *c2, *c3;
 532
 533         c1 = (uchar *)s;
 534         c2 = (uchar *)++s;
 535         c3 = (uchar *)++s;
 536         if(b < 1) {
 537                 return 0;
 538         } else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1) {
 539                 return 0;
 540         } else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 541             ((b == 1) ||
 542             ((b == 2) && (*c2&(B7|B6)) == B7))) {
 543                 return 0;
 544         } else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 545             ((b == 1) ||
 546             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 547             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7))) {
 548                 return 0;
 549         } else {
 550                 return 1;
 551         }
 552 }
 553
 554 int
 555 utf8size(char *s) {
 556         uchar c = *s;
 557
 558         if(~c&B7) {
 559                 return 1;
 560         } else if((c&(B7|B6|B5)) == (B7|B6)) {
 561                 return 2;
 562         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) {
 563                 return 3;
 564         } else {
 565                 return 4;
 566         }
 567 }
 568
 569 void
 570 selinit(void) {
 571         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 572         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 573         sel.mode = 0;
 574         sel.bx = -1;
 575         sel.clip = NULL;
 576         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 577         if(sel.xtarget == None)
 578                 sel.xtarget = XA_STRING;
 579 }
 580
 581 static inline bool
 582 selected(int x, int y) {
 583         int bx, ex;
 584
 585         if(sel.ey == y && sel.by == y) {
 586                 bx = MIN(sel.bx, sel.ex);
 587                 ex = MAX(sel.bx, sel.ex);
 588                 return BETWEEN(x, bx, ex);
 589         }
 590
 591         return ((sel.b.y < y && y < sel.e.y)
 592                         || (y == sel.e.y && x <= sel.e.x))
 593                         || (y == sel.b.y && x >= sel.b.x
 594                                 && (x <= sel.e.x || sel.b.y != sel.e.y));
 595 }
 596
 597 void
 598 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 599         if(b)
 600                 *b = e->xbutton.button;
 601
 602         *x = X2COL(e->xbutton.x);
 603         *y = Y2ROW(e->xbutton.y);
 604         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 605         sel.b.y = MIN(sel.by, sel.ey);
 606         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 607         sel.e.y = MAX(sel.by, sel.ey);
 608 }
 609
 610 void
 611 mousereport(XEvent *e) {
 612         int x = X2COL(e->xbutton.x);
 613         int y = Y2ROW(e->xbutton.y);
 614         int button = e->xbutton.button;
 615         int state = e->xbutton.state;
 616         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 617         static int ob, ox, oy;
 618
 619         /* from urxvt */
 620         if(e->xbutton.type == MotionNotify) {
 621                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 622                         return;
 623                 button = ob + 32;
 624                 ox = x, oy = y;
 625         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 626                 button = 3;
 627         } else {
 628                 button -= Button1;
 629                 if(button >= 3)
 630                         button += 64 - 3;
 631                 if(e->xbutton.type == ButtonPress) {
 632                         ob = button;
 633                         ox = x, oy = y;
 634                 }
 635         }
 636
 637         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 638                 + (state & Mod4Mask    ? 8  : 0)
 639                 + (state & ControlMask ? 16 : 0);
 640
 641         ttywrite(buf, sizeof(buf));
 642 }
 643
 644 void
 645 bpress(XEvent *e) {
 646         if(IS_SET(MODE_MOUSE)) {
 647                 mousereport(e);
 648         } else if(e->xbutton.button == Button1) {
 649                 if(sel.bx != -1) {
 650                         sel.bx = -1;
 651                         tsetdirt(sel.b.y, sel.e.y);
 652                         draw();
 653                 }
 654                 sel.mode = 1;
 655                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 656                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 657         }
 658 }
 659
 660 void
 661 selcopy(void) {
 662         char *str, *ptr, *p;
 663         int x, y, bufsize, is_selected = 0, size;
 664         Glyph *gp;
 665
 666         if(sel.bx == -1) {
 667                 str = NULL;
 668         } else {
 669                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 670                 ptr = str = xmalloc(bufsize);
 671
 672                 /* append every set & selected glyph to the selection */
 673                 for(y = 0; y < term.row; y++) {
 674                         for(x = 0; x < term.col; x++) {
 675                                 gp = &term.line[y][x];
 676
 677                                 if(!(is_selected = selected(x, y)))
 678                                         continue;
 679                                 p = (gp->state & GLYPH_SET) ? gp->c : " ";
 680                                 size = utf8size(p);
 681                                 memcpy(ptr, p, size);
 682                                 ptr += size;
 683                         }
 684                         /* \n at the end of every selected line except for the last one */
 685                         if(is_selected && y < sel.e.y)
 686                                 *ptr++ = '\n';
 687                 }
 688                 *ptr = 0;
 689         }
 690         sel.alt = IS_SET(MODE_ALTSCREEN);
 691         xsetsel(str);
 692 }
 693
 694 void
 695 selnotify(XEvent *e) {
 696         ulong nitems, ofs, rem;
 697         int format;
 698         uchar *data;
 699         Atom type;
 700
 701         ofs = 0;
 702         do {
 703                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 704                                         False, AnyPropertyType, &type, &format,
 705                                         &nitems, &rem, &data)) {
 706                         fprintf(stderr, "Clipboard allocation failed\n");
 707                         return;
 708                 }
 709                 ttywrite((const char *) data, nitems * format / 8);
 710                 XFree(data);
 711                 /* number of 32-bit chunks returned */
 712                 ofs += nitems * format / 32;
 713         } while(rem > 0);
 714 }
 715
 716 void
 717 selpaste(void) {
 718         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
 719                         xw.win, CurrentTime);
 720 }
 721
 722 void selclear(XEvent *e) {
 723         if(sel.bx == -1)
 724                 return;
 725         sel.bx = -1;
 726         tsetdirt(sel.b.y, sel.e.y);
 727 }
 728
 729 void
 730 selrequest(XEvent *e) {
 731         XSelectionRequestEvent *xsre;
 732         XSelectionEvent xev;
 733         Atom xa_targets, string;
 734
 735         xsre = (XSelectionRequestEvent *) e;
 736         xev.type = SelectionNotify;
 737         xev.requestor = xsre->requestor;
 738         xev.selection = xsre->selection;
 739         xev.target = xsre->target;
 740         xev.time = xsre->time;
 741         /* reject */
 742         xev.property = None;
 743
 744         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 745         if(xsre->target == xa_targets) {
 746                 /* respond with the supported type */
 747                 string = sel.xtarget;
 748                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 749                                 XA_ATOM, 32, PropModeReplace,
 750                                 (uchar *) &string, 1);
 751                 xev.property = xsre->property;
 752         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 753                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 754                                 xsre->target, 8, PropModeReplace,
 755                                 (uchar *) sel.clip, strlen(sel.clip));
 756                 xev.property = xsre->property;
 757         }
 758
 759         /* all done, send a notification to the listener */
 760         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 761                 fprintf(stderr, "Error sending SelectionNotify event\n");
 762 }
 763
 764 void
 765 xsetsel(char *str) {
 766         /* register the selection for both the clipboard and the primary */
 767         Atom clipboard;
 768
 769         free(sel.clip);
 770         sel.clip = str;
 771
 772         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 773
 774         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 775         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 776 }
 777
 778 void
 779 brelease(XEvent *e) {
 780         struct timeval now;
 781
 782         if(IS_SET(MODE_MOUSE)) {
 783                 mousereport(e);
 784                 return;
 785         }
 786
 787         if(e->xbutton.button == Button2) {
 788                 selpaste();
 789         } else if(e->xbutton.button == Button1) {
 790                 sel.mode = 0;
 791                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 792                 term.dirty[sel.ey] = 1;
 793                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 794                         sel.bx = -1;
 795                         gettimeofday(&now, NULL);
 796
 797                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 798                                 /* triple click on the line */
 799                                 sel.b.x = sel.bx = 0;
 800                                 sel.e.x = sel.ex = term.col;
 801                                 sel.b.y = sel.e.y = sel.ey;
 802                                 selcopy();
 803                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 804                                 /* double click to select word */
 805                                 sel.bx = sel.ex;
 806                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 807                                                 term.line[sel.ey][sel.bx-1].c[0] != ' ') {
 808                                         sel.bx--;
 809                                 }
 810                                 sel.b.x = sel.bx;
 811                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 812                                                 term.line[sel.ey][sel.ex+1].c[0] != ' ') {
 813                                         sel.ex++;
 814                                 }
 815                                 sel.e.x = sel.ex;
 816                                 sel.b.y = sel.e.y = sel.ey;
 817                                 selcopy();
 818                         }
 819                 } else {
 820                         selcopy();
 821                 }
 822         }
 823
 824         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 825         gettimeofday(&sel.tclick1, NULL);
 826 }
 827
 828 void
 829 bmotion(XEvent *e) {
 830         int starty, endy, oldey, oldex;
 831
 832         if(IS_SET(MODE_MOUSE)) {
 833                 mousereport(e);
 834                 return;
 835         }
 836
 837         if(sel.mode) {
 838                 oldey = sel.ey;
 839                 oldex = sel.ex;
 840                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 841
 842                 if(oldey != sel.ey || oldex != sel.ex) {
 843                         starty = MIN(oldey, sel.ey);
 844                         endy = MAX(oldey, sel.ey);
 845                         tsetdirt(starty, endy);
 846                 }
 847         }
 848 }
 849
 850 void
 851 die(const char *errstr, ...) {
 852         va_list ap;
 853
 854         va_start(ap, errstr);
 855         vfprintf(stderr, errstr, ap);
 856         va_end(ap);
 857         exit(EXIT_FAILURE);
 858 }
 859
 860 void
 861 execsh(void) {
 862         char **args;
 863         char *envshell = getenv("SHELL");
 864
 865         unsetenv("COLUMNS");
 866         unsetenv("LINES");
 867         unsetenv("TERMCAP");
 868
 869         signal(SIGCHLD, SIG_DFL);
 870         signal(SIGHUP, SIG_DFL);
 871         signal(SIGINT, SIG_DFL);
 872         signal(SIGQUIT, SIG_DFL);
 873         signal(SIGTERM, SIG_DFL);
 874         signal(SIGALRM, SIG_DFL);
 875
 876         DEFAULT(envshell, SHELL);
 877         putenv("TERM="TNAME);
 878         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 879         execvp(args[0], args);
 880         exit(EXIT_FAILURE);
 881 }
 882
 883 void
 884 sigchld(int a) {
 885         int stat = 0;
 886
 887         if(waitpid(pid, &stat, 0) < 0)
 888                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 889
 890         if(WIFEXITED(stat)) {
 891                 exit(WEXITSTATUS(stat));
 892         } else {
 893                 exit(EXIT_FAILURE);
 894         }
 895 }
 896
 897 void
 898 ttynew(void) {
 899         int m, s;
 900         struct winsize w = {term.row, term.col, 0, 0};
 901
 902         /* seems to work fine on linux, openbsd and freebsd */
 903         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 904                 die("openpty failed: %s\n", SERRNO);
 905
 906         switch(pid = fork()) {
 907         case -1:
 908                 die("fork failed\n");
 909                 break;
 910         case 0:
 911                 setsid(); /* create a new process group */
 912                 dup2(s, STDIN_FILENO);
 913                 dup2(s, STDOUT_FILENO);
 914                 dup2(s, STDERR_FILENO);
 915                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 916                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 917                 close(s);
 918                 close(m);
 919                 execsh();
 920                 break;
 921         default:
 922                 close(s);
 923                 cmdfd = m;
 924                 signal(SIGCHLD, sigchld);
 925                 if(opt_io) {
 926                         if(!strcmp(opt_io, "-")) {
 927                                 iofd = STDOUT_FILENO;
 928                         } else {
 929                                 if((iofd = open(opt_io, O_WRONLY | O_CREAT, 0666)) < 0) {
 930                                         fprintf(stderr, "Error opening %s:%s\n",
 931                                                 opt_io, strerror(errno));
 932                                 }
 933                         }
 934                 }
 935         }
 936 }
 937
 938 void
 939 dump(char c) {
 940         static int col;
 941
 942         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 943         if(++col % 10 == 0)
 944                 fprintf(stderr, "\n");
 945 }
 946
 947 void
 948 ttyread(void) {
 949         static char buf[BUFSIZ];
 950         static int buflen = 0;
 951         char *ptr;
 952         char s[UTF_SIZ];
 953         int charsize; /* size of utf8 char in bytes */
 954         long utf8c;
 955         int ret;
 956
 957         /* append read bytes to unprocessed bytes */
 958         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 959                 die("Couldn't read from shell: %s\n", SERRNO);
 960
 961         /* process every complete utf8 char */
 962         buflen += ret;
 963         ptr = buf;
 964         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 965                 charsize = utf8decode(ptr, &utf8c);
 966                 utf8encode(&utf8c, s);
 967                 tputc(s, charsize);
 968                 ptr += charsize;
 969                 buflen -= charsize;
 970         }
 971
 972         /* keep any uncomplete utf8 char for the next call */
 973         memmove(buf, ptr, buflen);
 974 }
 975
 976 void
 977 ttywrite(const char *s, size_t n) {
 978         if(write(cmdfd, s, n) == -1)
 979                 die("write error on tty: %s\n", SERRNO);
 980 }
 981
 982 void
 983 ttyresize(void) {
 984         struct winsize w;
 985
 986         w.ws_row = term.row;
 987         w.ws_col = term.col;
 988         w.ws_xpixel = xw.tw;
 989         w.ws_ypixel = xw.th;
 990         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 991                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 992 }
 993
 994 void
 995 tsetdirt(int top, int bot) {
 996         int i;
 997
 998         LIMIT(top, 0, term.row-1);
 999         LIMIT(bot, 0, term.row-1);
1000
1001         for(i = top; i <= bot; i++)
1002                 term.dirty[i] = 1;
1003 }
1004
1005 void
1006 tfulldirt(void) {
1007         tsetdirt(0, term.row-1);
1008 }
1009
1010 void
1011 tcursor(int mode) {
1012         static TCursor c;
1013
1014         if(mode == CURSOR_SAVE) {
1015                 c = term.c;
1016         } else if(mode == CURSOR_LOAD) {
1017                 term.c = c;
1018                 tmoveto(c.x, c.y);
1019         }
1020 }
1021
1022 void
1023 treset(void) {
1024         uint i;
1025
1026         term.c = (TCursor){{
1027                 .mode = ATTR_NULL,
1028                 .fg = DefaultFG,
1029                 .bg = DefaultBG
1030         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1031
1032         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1033         for(i = TAB; i < term.col; i += TAB)
1034                 term.tabs[i] = 1;
1035         term.top = 0;
1036         term.bot = term.row - 1;
1037         term.mode = MODE_WRAP;
1038
1039         tclearregion(0, 0, term.col-1, term.row-1);
1040 }
1041
1042 void
1043 tnew(int col, int row) {
1044         /* set screen size */
1045         term.row = row;
1046         term.col = col;
1047         term.line = xmalloc(term.row * sizeof(Line));
1048         term.alt  = xmalloc(term.row * sizeof(Line));
1049         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
1050         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
1051
1052         for(row = 0; row < term.row; row++) {
1053                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
1054                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
1055                 term.dirty[row] = 0;
1056         }
1057         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1058         /* setup screen */
1059         treset();
1060 }
1061
1062 void
1063 tswapscreen(void) {
1064         Line *tmp = term.line;
1065
1066         term.line = term.alt;
1067         term.alt = tmp;
1068         term.mode ^= MODE_ALTSCREEN;
1069         tfulldirt();
1070 }
1071
1072 void
1073 tscrolldown(int orig, int n) {
1074         int i;
1075         Line temp;
1076
1077         LIMIT(n, 0, term.bot-orig+1);
1078
1079         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1080
1081         for(i = term.bot; i >= orig+n; i--) {
1082                 temp = term.line[i];
1083                 term.line[i] = term.line[i-n];
1084                 term.line[i-n] = temp;
1085
1086                 term.dirty[i] = 1;
1087                 term.dirty[i-n] = 1;
1088         }
1089
1090         selscroll(orig, n);
1091 }
1092
1093 void
1094 tscrollup(int orig, int n) {
1095         int i;
1096         Line temp;
1097         LIMIT(n, 0, term.bot-orig+1);
1098
1099         tclearregion(0, orig, term.col-1, orig+n-1);
1100
1101         for(i = orig; i <= term.bot-n; i++) {
1102                  temp = term.line[i];
1103                  term.line[i] = term.line[i+n];
1104                  term.line[i+n] = temp;
1105
1106                  term.dirty[i] = 1;
1107                  term.dirty[i+n] = 1;
1108         }
1109
1110         selscroll(orig, -n);
1111 }
1112
1113 void
1114 selscroll(int orig, int n) {
1115         if(sel.bx == -1)
1116                 return;
1117
1118         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1119                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1120                         sel.bx = -1;
1121                         return;
1122                 }
1123                 if(sel.by < term.top) {
1124                         sel.by = term.top;
1125                         sel.bx = 0;
1126                 }
1127                 if(sel.ey > term.bot) {
1128                         sel.ey = term.bot;
1129                         sel.ex = term.col;
1130                 }
1131                 sel.b.y = sel.by, sel.b.x = sel.bx;
1132                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1133         }
1134 }
1135
1136 void
1137 tnewline(int first_col) {
1138         int y = term.c.y;
1139
1140         if(y == term.bot) {
1141                 tscrollup(term.top, 1);
1142         } else {
1143                 y++;
1144         }
1145         tmoveto(first_col ? 0 : term.c.x, y);
1146 }
1147
1148 void
1149 csiparse(void) {
1150         /* int noarg = 1; */
1151         char *p = csiescseq.buf;
1152
1153         csiescseq.narg = 0;
1154         if(*p == '?')
1155                 csiescseq.priv = 1, p++;
1156
1157         while(p < csiescseq.buf+csiescseq.len) {
1158                 while(isdigit(*p)) {
1159                         csiescseq.arg[csiescseq.narg] *= 10;
1160                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1161                 }
1162                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ) {
1163                         csiescseq.narg++, p++;
1164                 } else {
1165                         csiescseq.mode = *p;
1166                         csiescseq.narg++;
1167
1168                         return;
1169                 }
1170         }
1171 }
1172
1173 void
1174 tmoveto(int x, int y) {
1175         LIMIT(x, 0, term.col-1);
1176         LIMIT(y, 0, term.row-1);
1177         term.c.state &= ~CURSOR_WRAPNEXT;
1178         term.c.x = x;
1179         term.c.y = y;
1180 }
1181
1182 void
1183 tsetchar(char *c) {
1184         char *vt100_0[62] = { /* 0x41 - 0x7e */
1185                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1186                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1187                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1188                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1189                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1190                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1191                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1192                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1193         };
1194
1195         /*
1196          * The table is proudly stolen from rxvt.
1197          */
1198         if(term.c.attr.mode & ATTR_GFX) {
1199                 if(c[0] >= 0x41 && c[0] <= 0x7e
1200                                 && vt100_0[c[0] - 0x41]) {
1201                         c = vt100_0[c[0] - 0x41];
1202                 }
1203         }
1204
1205         term.dirty[term.c.y] = 1;
1206         term.line[term.c.y][term.c.x] = term.c.attr;
1207         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1208         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1209 }
1210
1211 void
1212 tclearregion(int x1, int y1, int x2, int y2) {
1213         int x, y, temp;
1214
1215         if(x1 > x2)
1216                 temp = x1, x1 = x2, x2 = temp;
1217         if(y1 > y2)
1218                 temp = y1, y1 = y2, y2 = temp;
1219
1220         LIMIT(x1, 0, term.col-1);
1221         LIMIT(x2, 0, term.col-1);
1222         LIMIT(y1, 0, term.row-1);
1223         LIMIT(y2, 0, term.row-1);
1224
1225         for(y = y1; y <= y2; y++) {
1226                 term.dirty[y] = 1;
1227                 for(x = x1; x <= x2; x++)
1228                         term.line[y][x].state = 0;
1229         }
1230 }
1231
1232 void
1233 tdeletechar(int n) {
1234         int src = term.c.x + n;
1235         int dst = term.c.x;
1236         int size = term.col - src;
1237
1238         term.dirty[term.c.y] = 1;
1239
1240         if(src >= term.col) {
1241                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1242                 return;
1243         }
1244
1245         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1246                         size * sizeof(Glyph));
1247         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1248 }
1249
1250 void
1251 tinsertblank(int n) {
1252         int src = term.c.x;
1253         int dst = src + n;
1254         int size = term.col - dst;
1255
1256         term.dirty[term.c.y] = 1;
1257
1258         if(dst >= term.col) {
1259                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1260                 return;
1261         }
1262
1263         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1264                         size * sizeof(Glyph));
1265         tclearregion(src, term.c.y, dst - 1, term.c.y);
1266 }
1267
1268 void
1269 tinsertblankline(int n) {
1270         if(term.c.y < term.top || term.c.y > term.bot)
1271                 return;
1272
1273         tscrolldown(term.c.y, n);
1274 }
1275
1276 void
1277 tdeleteline(int n) {
1278         if(term.c.y < term.top || term.c.y > term.bot)
1279                 return;
1280
1281         tscrollup(term.c.y, n);
1282 }
1283
1284 void
1285 tsetattr(int *attr, int l) {
1286         int i;
1287
1288         for(i = 0; i < l; i++) {
1289                 switch(attr[i]) {
1290                 case 0:
1291                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1292                                         | ATTR_ITALIC | ATTR_BLINK);
1293                         term.c.attr.fg = DefaultFG;
1294                         term.c.attr.bg = DefaultBG;
1295                         break;
1296                 case 1:
1297                         term.c.attr.mode |= ATTR_BOLD;
1298                         break;
1299                 case 3: /* enter standout (highlight) */
1300                         term.c.attr.mode |= ATTR_ITALIC;
1301                         break;
1302                 case 4:
1303                         term.c.attr.mode |= ATTR_UNDERLINE;
1304                         break;
1305                 case 5:
1306                         term.c.attr.mode |= ATTR_BLINK;
1307                         break;
1308                 case 7:
1309                         term.c.attr.mode |= ATTR_REVERSE;
1310                         break;
1311                 case 21:
1312                 case 22:
1313                         term.c.attr.mode &= ~ATTR_BOLD;
1314                         break;
1315                 case 23: /* leave standout (highlight) mode */
1316                         term.c.attr.mode &= ~ATTR_ITALIC;
1317                         break;
1318                 case 24:
1319                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1320                         break;
1321                 case 25:
1322                         term.c.attr.mode &= ~ATTR_BLINK;
1323                         break;
1324                 case 27:
1325                         term.c.attr.mode &= ~ATTR_REVERSE;
1326                         break;
1327                 case 38:
1328                         if(i + 2 < l && attr[i + 1] == 5) {
1329                                 i += 2;
1330                                 if(BETWEEN(attr[i], 0, 255)) {
1331                                         term.c.attr.fg = attr[i];
1332                                 } else {
1333                                         fprintf(stderr,
1334                                                 "erresc: bad fgcolor %d\n",
1335                                                 attr[i]);
1336                                 }
1337                         } else {
1338                                 fprintf(stderr,
1339                                         "erresc(38): gfx attr %d unknown\n",
1340                                         attr[i]);
1341                         }
1342                         break;
1343                 case 39:
1344                         term.c.attr.fg = DefaultFG;
1345                         break;
1346                 case 48:
1347                         if(i + 2 < l && attr[i + 1] == 5) {
1348                                 i += 2;
1349                                 if(BETWEEN(attr[i], 0, 255)) {
1350                                         term.c.attr.bg = attr[i];
1351                                 } else {
1352                                         fprintf(stderr,
1353                                                 "erresc: bad bgcolor %d\n",
1354                                                 attr[i]);
1355                                 }
1356                         } else {
1357                                 fprintf(stderr,
1358                                         "erresc(48): gfx attr %d unknown\n",
1359                                         attr[i]);
1360                         }
1361                         break;
1362                 case 49:
1363                         term.c.attr.bg = DefaultBG;
1364                         break;
1365                 default:
1366                         if(BETWEEN(attr[i], 30, 37)) {
1367                                 term.c.attr.fg = attr[i] - 30;
1368                         } else if(BETWEEN(attr[i], 40, 47)) {
1369                                 term.c.attr.bg = attr[i] - 40;
1370                         } else if(BETWEEN(attr[i], 90, 97)) {
1371                                 term.c.attr.fg = attr[i] - 90 + 8;
1372                         } else if(BETWEEN(attr[i], 100, 107)) {
1373                                 term.c.attr.bg = attr[i] - 100 + 8;
1374                         } else {
1375                                 fprintf(stderr,
1376                                         "erresc(default): gfx attr %d unknown\n",
1377                                         attr[i]), csidump();
1378                         }
1379                         break;
1380                 }
1381         }
1382 }
1383
1384 void
1385 tsetscroll(int t, int b) {
1386         int temp;
1387
1388         LIMIT(t, 0, term.row-1);
1389         LIMIT(b, 0, term.row-1);
1390         if(t > b) {
1391                 temp = t;
1392                 t = b;
1393                 b = temp;
1394         }
1395         term.top = t;
1396         term.bot = b;
1397 }
1398
1399 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1400
1401 void
1402 tsetmode(bool priv, bool set, int *args, int narg) {
1403         int *lim, mode;
1404
1405         for(lim = args + narg; args < lim; ++args) {
1406                 if(priv) {
1407                         switch(*args) {
1408                                 break;
1409                         case 1: /* DECCKM -- Cursor key */
1410                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1411                                 break;
1412                         case 5: /* DECSCNM -- Reverse video */
1413                                 mode = term.mode;
1414                                 MODBIT(term.mode, set, MODE_REVERSE);
1415                                 if(mode != term.mode)
1416                                         redraw();
1417                                 break;
1418                         case 6: /* XXX: DECOM -- Origin */
1419                                 break;
1420                         case 7: /* DECAWM -- Auto wrap */
1421                                 MODBIT(term.mode, set, MODE_WRAP);
1422                                 break;
1423                         case 8: /* XXX: DECARM -- Auto repeat */
1424                                 break;
1425                         case 0:  /* Error (IGNORED) */
1426                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1427                                 break;
1428                         case 25:
1429                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1430                                 break;
1431                         case 1000: /* 1000,1002: enable xterm mouse report */
1432                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1433                                 break;
1434                         case 1002:
1435                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1436                                 break;
1437                         case 1049: /* = 1047 and 1048 */
1438                         case 47:
1439                         case 1047:
1440                                 if(IS_SET(MODE_ALTSCREEN))
1441                                         tclearregion(0, 0, term.col-1, term.row-1);
1442                                 if((set && !IS_SET(MODE_ALTSCREEN)) ||
1443                                                 (!set && IS_SET(MODE_ALTSCREEN))) {
1444                                         tswapscreen();
1445                                 }
1446                                 if(*args != 1049)
1447                                         break;
1448                                 /* pass through */
1449                         case 1048:
1450                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1451                                 break;
1452                         default:
1453                         /* case 2:  DECANM -- ANSI/VT52 (NOT SUPPOURTED) */
1454                         /* case 3:  DECCOLM -- Column  (NOT SUPPORTED) */
1455                         /* case 4:  DECSCLM -- Scroll (NOT SUPPORTED) */
1456                         /* case 18: DECPFF -- Printer feed (NOT SUPPORTED) */
1457                         /* case 19: DECPEX -- Printer extent (NOT SUPPORTED) */
1458                         /* case 42: DECNRCM -- National characters (NOT SUPPORTED) */
1459                                 fprintf(stderr,
1460                                         "erresc: unknown private set/reset mode %d\n",
1461                                         *args);
1462                                 break;
1463                         }
1464                 } else {
1465                         switch(*args) {
1466                         case 0:  /* Error (IGNORED) */
1467                                 break;
1468                         case 2:  /* KAM -- keyboard action */
1469                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1470                                 break;
1471                         case 4:  /* IRM -- Insertion-replacement */
1472                                 MODBIT(term.mode, set, MODE_INSERT);
1473                                 break;
1474                         case 12: /* XXX: SRM -- Send/Receive */
1475                                 break;
1476                         case 20: /* LNM -- Linefeed/new line */
1477                                 MODBIT(term.mode, set, MODE_CRLF);
1478                                 break;
1479                         default:
1480                                 fprintf(stderr,
1481                                         "erresc: unknown set/reset mode %d\n",
1482                                         *args);
1483                                 break;
1484                         }
1485                 }
1486         }
1487 }
1488 #undef MODBIT
1489
1490
1491 void
1492 csihandle(void) {
1493         switch(csiescseq.mode) {
1494         default:
1495         unknown:
1496                 fprintf(stderr, "erresc: unknown csi ");
1497                 csidump();
1498                 /* die(""); */
1499                 break;
1500         case '@': /* ICH -- Insert <n> blank char */
1501                 DEFAULT(csiescseq.arg[0], 1);
1502                 tinsertblank(csiescseq.arg[0]);
1503                 break;
1504         case 'A': /* CUU -- Cursor <n> Up */
1505         case 'e':
1506                 DEFAULT(csiescseq.arg[0], 1);
1507                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1508                 break;
1509         case 'B': /* CUD -- Cursor <n> Down */
1510                 DEFAULT(csiescseq.arg[0], 1);
1511                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1512                 break;
1513         case 'C': /* CUF -- Cursor <n> Forward */
1514         case 'a':
1515                 DEFAULT(csiescseq.arg[0], 1);
1516                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1517                 break;
1518         case 'D': /* CUB -- Cursor <n> Backward */
1519                 DEFAULT(csiescseq.arg[0], 1);
1520                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1521                 break;
1522         case 'E': /* CNL -- Cursor <n> Down and first col */
1523                 DEFAULT(csiescseq.arg[0], 1);
1524                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1525                 break;
1526         case 'F': /* CPL -- Cursor <n> Up and first col */
1527                 DEFAULT(csiescseq.arg[0], 1);
1528                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1529                 break;
1530         case 'g': /* TBC -- Tabulation clear */
1531                 switch (csiescseq.arg[0]) {
1532                 case 0: /* clear current tab stop */
1533                         term.tabs[term.c.x] = 0;
1534                         break;
1535                 case 3: /* clear all the tabs */
1536                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1537                         break;
1538                 default:
1539                         goto unknown;
1540                 }
1541                 break;
1542         case 'G': /* CHA -- Move to <col> */
1543         case '`': /* HPA */
1544                 DEFAULT(csiescseq.arg[0], 1);
1545                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1546                 break;
1547         case 'H': /* CUP -- Move to <row> <col> */
1548         case 'f': /* HVP */
1549                 DEFAULT(csiescseq.arg[0], 1);
1550                 DEFAULT(csiescseq.arg[1], 1);
1551                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1552                 break;
1553         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1554                 DEFAULT(csiescseq.arg[0], 1);
1555                 while(csiescseq.arg[0]--)
1556                         tputtab(1);
1557                 break;
1558         case 'J': /* ED -- Clear screen */
1559                 sel.bx = -1;
1560                 switch(csiescseq.arg[0]) {
1561                 case 0: /* below */
1562                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1563                         if(term.c.y < term.row-1)
1564                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1565                         break;
1566                 case 1: /* above */
1567                         if(term.c.y > 1)
1568                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1569                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1570                         break;
1571                 case 2: /* all */
1572                         tclearregion(0, 0, term.col-1, term.row-1);
1573                         break;
1574                 default:
1575                         goto unknown;
1576                 }
1577                 break;
1578         case 'K': /* EL -- Clear line */
1579                 switch(csiescseq.arg[0]) {
1580                 case 0: /* right */
1581                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1582                         break;
1583                 case 1: /* left */
1584                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1585                         break;
1586                 case 2: /* all */
1587                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1588                         break;
1589                 }
1590                 break;
1591         case 'S': /* SU -- Scroll <n> line up */
1592                 DEFAULT(csiescseq.arg[0], 1);
1593                 tscrollup(term.top, csiescseq.arg[0]);
1594                 break;
1595         case 'T': /* SD -- Scroll <n> line down */
1596                 DEFAULT(csiescseq.arg[0], 1);
1597                 tscrolldown(term.top, csiescseq.arg[0]);
1598                 break;
1599         case 'L': /* IL -- Insert <n> blank lines */
1600                 DEFAULT(csiescseq.arg[0], 1);
1601                 tinsertblankline(csiescseq.arg[0]);
1602                 break;
1603         case 'l': /* RM -- Reset Mode */
1604                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1605                 break;
1606         case 'M': /* DL -- Delete <n> lines */
1607                 DEFAULT(csiescseq.arg[0], 1);
1608                 tdeleteline(csiescseq.arg[0]);
1609                 break;
1610         case 'X': /* ECH -- Erase <n> char */
1611                 DEFAULT(csiescseq.arg[0], 1);
1612                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1613                 break;
1614         case 'P': /* DCH -- Delete <n> char */
1615                 DEFAULT(csiescseq.arg[0], 1);
1616                 tdeletechar(csiescseq.arg[0]);
1617                 break;
1618         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1619                 DEFAULT(csiescseq.arg[0], 1);
1620                 while(csiescseq.arg[0]--)
1621                         tputtab(0);
1622                 break;
1623         case 'd': /* VPA -- Move to <row> */
1624                 DEFAULT(csiescseq.arg[0], 1);
1625                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1626                 break;
1627         case 'h': /* SM -- Set terminal mode */
1628                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1629                 break;
1630         case 'm': /* SGR -- Terminal attribute (color) */
1631                 tsetattr(csiescseq.arg, csiescseq.narg);
1632                 break;
1633         case 'r': /* DECSTBM -- Set Scrolling Region */
1634                 if(csiescseq.priv) {
1635                         goto unknown;
1636                 } else {
1637                         DEFAULT(csiescseq.arg[0], 1);
1638                         DEFAULT(csiescseq.arg[1], term.row);
1639                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1640                         tmoveto(0, 0);
1641                 }
1642                 break;
1643         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1644                 tcursor(CURSOR_SAVE);
1645                 break;
1646         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1647                 tcursor(CURSOR_LOAD);
1648                 break;
1649         }
1650 }
1651
1652 void
1653 csidump(void) {
1654         int i;
1655         uint c;
1656
1657         printf("ESC[");
1658         for(i = 0; i < csiescseq.len; i++) {
1659                 c = csiescseq.buf[i] & 0xff;
1660                 if(isprint(c)) {
1661                         putchar(c);
1662                 } else if(c == '\n') {
1663                         printf("(\\n)");
1664                 } else if(c == '\r') {
1665                         printf("(\\r)");
1666                 } else if(c == 0x1b) {
1667                         printf("(\\e)");
1668                 } else {
1669                         printf("(%02x)", c);
1670                 }
1671         }
1672         putchar('\n');
1673 }
1674
1675 void
1676 csireset(void) {
1677         memset(&csiescseq, 0, sizeof(csiescseq));
1678 }
1679
1680 void
1681 strhandle(void) {
1682         char *p;
1683
1684         /*
1685          * TODO: make this being useful in case of color palette change.
1686          */
1687         strparse();
1688
1689         p = strescseq.buf;
1690
1691         switch(strescseq.type) {
1692         case ']': /* OSC -- Operating System Command */
1693                 switch(p[0]) {
1694                 case '0':
1695                 case '1':
1696                 case '2':
1697                         /*
1698                          * TODO: Handle special chars in string, like umlauts.
1699                          */
1700                         if(p[1] == ';') {
1701                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1702                         }
1703                         break;
1704                 case ';':
1705                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1706                         break;
1707                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1708                         break;
1709                 default:
1710                         fprintf(stderr, "erresc: unknown str ");
1711                         strdump();
1712                         break;
1713                 }
1714                 break;
1715         case 'k': /* old title set compatibility */
1716                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1717                 break;
1718         case 'P': /* DSC -- Device Control String */
1719         case '_': /* APC -- Application Program Command */
1720         case '^': /* PM -- Privacy Message */
1721         default:
1722                 fprintf(stderr, "erresc: unknown str ");
1723                 strdump();
1724                 /* die(""); */
1725                 break;
1726         }
1727 }
1728
1729 void
1730 strparse(void) {
1731         /*
1732          * TODO: Implement parsing like for CSI when required.
1733          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1734          */
1735         return;
1736 }
1737
1738 void
1739 strdump(void) {
1740         int i;
1741         uint c;
1742
1743         printf("ESC%c", strescseq.type);
1744         for(i = 0; i < strescseq.len; i++) {
1745                 c = strescseq.buf[i] & 0xff;
1746                 if(isprint(c)) {
1747                         putchar(c);
1748                 } else if(c == '\n') {
1749                         printf("(\\n)");
1750                 } else if(c == '\r') {
1751                         printf("(\\r)");
1752                 } else if(c == 0x1b) {
1753                         printf("(\\e)");
1754                 } else {
1755                         printf("(%02x)", c);
1756                 }
1757         }
1758         printf("ESC\\\n");
1759 }
1760
1761 void
1762 strreset(void) {
1763         memset(&strescseq, 0, sizeof(strescseq));
1764 }
1765
1766 void
1767 tputtab(bool forward) {
1768         uint x = term.c.x;
1769
1770         if(forward) {
1771                 if(x == term.col)
1772                         return;
1773                 for(++x; x < term.col && !term.tabs[x]; ++x)
1774                         /* nothing */ ;
1775         } else {
1776                 if(x == 0)
1777                         return;
1778                 for(--x; x > 0 && !term.tabs[x]; --x)
1779                         /* nothing */ ;
1780         }
1781         tmoveto(x, term.c.y);
1782 }
1783
1784 void
1785 tputc(char *c, int len) {
1786         uchar ascii = *c;
1787
1788         if(iofd != -1)
1789                 write(iofd, c, len);
1790
1791         switch(ascii) {
1792         case '\t':      /* HT */
1793                 tputtab(1);
1794                 return;
1795         case '\b':      /* BS */
1796                 tmoveto(term.c.x-1, term.c.y);
1797                 return;
1798         case '\r':      /* CR */
1799                 tmoveto(0, term.c.y);
1800                 return;
1801         case '\f':      /* LF */
1802         case '\v':      /* VT */
1803         case '\n':      /* LF */
1804                 /* go to first col if the mode is set */
1805                 tnewline(IS_SET(MODE_CRLF));
1806                 return;
1807         case '\a':      /* BEL */
1808                 if(term.esc & ESC_STR)
1809                         break;
1810                 if(!(xw.state & WIN_FOCUSED))
1811                         xseturgency(1);
1812                 return;
1813         case '\033':    /* ESC */
1814                 csireset();
1815                 term.esc = ESC_START;
1816                 return;
1817         case '\016':    /* SO */
1818                 term.c.attr.mode |= ATTR_GFX;
1819                 break;
1820         case '\017':    /* SI */
1821                 term.c.attr.mode &= ~ATTR_GFX;
1822                 return;
1823         case '\032':    /* SUB */
1824         case '\030':    /* CAN */
1825                 csireset();
1826                 return;
1827         default:
1828         /* case '\005': ENQ (IGNORED) */
1829         /* case '\000': NUL (IGNORED) */
1830         /* case '\021': XON (IGNORED) */
1831         /* case '\023': XOFF (IGNORED) */
1832         /* case 0177:   DEL (IGNORED) */
1833                 break;
1834         }
1835
1836         if(term.esc & ESC_START) {
1837                 if(term.esc & ESC_CSI) {
1838                         csiescseq.buf[csiescseq.len++] = ascii;
1839                         if(BETWEEN(ascii, 0x40, 0x7E)
1840                                         || csiescseq.len >= ESC_BUF_SIZ) {
1841                                 term.esc = 0;
1842                                 csiparse(), csihandle();
1843                         }
1844                 } else if(term.esc & ESC_STR) {
1845                         switch(ascii) {
1846                         case '\033':
1847                                 term.esc = ESC_START | ESC_STR_END;
1848                                 break;
1849                         case '\a': /* backwards compatibility to xterm */
1850                                 term.esc = 0;
1851                                 strhandle();
1852                                 break;
1853                         default:
1854                                 strescseq.buf[strescseq.len++] = ascii;
1855                                 if(strescseq.len+1 >= STR_BUF_SIZ) {
1856                                         term.esc = 0;
1857                                         strhandle();
1858                                 }
1859                         }
1860                 } else if(term.esc & ESC_STR_END) {
1861                         term.esc = 0;
1862                         if(ascii == '\\')
1863                                 strhandle();
1864                 } else if(term.esc & ESC_ALTCHARSET) {
1865                         switch(ascii) {
1866                         case '0': /* Line drawing set */
1867                                 term.c.attr.mode |= ATTR_GFX;
1868                                 break;
1869                         case 'B': /* USASCII */
1870                                 term.c.attr.mode &= ~ATTR_GFX;
1871                                 break;
1872                         case 'A': /* UK (IGNORED) */
1873                         case '<': /* multinational charset (IGNORED) */
1874                         case '5': /* Finnish (IGNORED) */
1875                         case 'C': /* Finnish (IGNORED) */
1876                         case 'K': /* German (IGNORED) */
1877                                 break;
1878                         default:
1879                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1880                         }
1881                         term.esc = 0;
1882                 } else {
1883                         switch(ascii) {
1884                         case '[':
1885                                 term.esc |= ESC_CSI;
1886                                 break;
1887                         case 'P': /* DCS -- Device Control String */
1888                         case '_': /* APC -- Application Program Command */
1889                         case '^': /* PM -- Privacy Message */
1890                         case ']': /* OSC -- Operating System Command */
1891                         case 'k': /* old title set compatibility */
1892                                 strreset();
1893                                 strescseq.type = ascii;
1894                                 term.esc |= ESC_STR;
1895                                 break;
1896                         case '(': /* set primary charset G0 */
1897                                 term.esc |= ESC_ALTCHARSET;
1898                                 break;
1899                         case ')': /* set secondary charset G1 (IGNORED) */
1900                         case '*': /* set tertiary charset G2 (IGNORED) */
1901                         case '+': /* set quaternary charset G3 (IGNORED) */
1902                                 term.esc = 0;
1903                                 break;
1904                         case 'D': /* IND -- Linefeed */
1905                                 if(term.c.y == term.bot) {
1906                                         tscrollup(term.top, 1);
1907                                 } else {
1908                                         tmoveto(term.c.x, term.c.y+1);
1909                                 }
1910                                 term.esc = 0;
1911                                 break;
1912                         case 'E': /* NEL -- Next line */
1913                                 tnewline(1); /* always go to first col */
1914                                 term.esc = 0;
1915                                 break;
1916                         case 'H': /* HTS -- Horizontal tab stop */
1917                                 term.tabs[term.c.x] = 1;
1918                                 term.esc = 0;
1919                                 break;
1920                         case 'M': /* RI -- Reverse index */
1921                                 if(term.c.y == term.top) {
1922                                         tscrolldown(term.top, 1);
1923                                 } else {
1924                                         tmoveto(term.c.x, term.c.y-1);
1925                                 }
1926                                 term.esc = 0;
1927                                 break;
1928                         case 'c': /* RIS -- Reset to inital state */
1929                                 treset();
1930                                 term.esc = 0;
1931                                 xresettitle();
1932                                 break;
1933                         case '=': /* DECPAM -- Application keypad */
1934                                 term.mode |= MODE_APPKEYPAD;
1935                                 term.esc = 0;
1936                                 break;
1937                         case '>': /* DECPNM -- Normal keypad */
1938                                 term.mode &= ~MODE_APPKEYPAD;
1939                                 term.esc = 0;
1940                                 break;
1941                         case '7': /* DECSC -- Save Cursor */
1942                                 tcursor(CURSOR_SAVE);
1943                                 term.esc = 0;
1944                                 break;
1945                         case '8': /* DECRC -- Restore Cursor */
1946                                 tcursor(CURSOR_LOAD);
1947                                 term.esc = 0;
1948                                 break;
1949                         case '\\': /* ST -- Stop */
1950                                 term.esc = 0;
1951                                 break;
1952                         default:
1953                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1954                                         (uchar) ascii, isprint(ascii)? ascii:'.');
1955                                 term.esc = 0;
1956                         }
1957                 }
1958         } else {
1959                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1960                         sel.bx = -1;
1961                 if(ascii >= '\020' || term.c.attr.mode & ATTR_GFX) {
1962                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1963                                 tnewline(1); /* always go to first col */
1964                         tsetchar(c);
1965                         if(term.c.x+1 < term.col) {
1966                                 tmoveto(term.c.x+1, term.c.y);
1967                         } else {
1968                                 term.c.state |= CURSOR_WRAPNEXT;
1969                         }
1970                 }
1971         }
1972 }
1973
1974 int
1975 tresize(int col, int row) {
1976         int i, x;
1977         int minrow = MIN(row, term.row);
1978         int mincol = MIN(col, term.col);
1979         int slide = term.c.y - row + 1;
1980         bool *bp;
1981
1982         if(col < 1 || row < 1)
1983                 return 0;
1984
1985         /* free unneeded rows */
1986         i = 0;
1987         if(slide > 0) {
1988                 /* slide screen to keep cursor where we expect it -
1989                  * tscrollup would work here, but we can optimize to
1990                  * memmove because we're freeing the earlier lines */
1991                 for(/* i = 0 */; i < slide; i++) {
1992                         free(term.line[i]);
1993                         free(term.alt[i]);
1994                 }
1995                 memmove(term.line, term.line + slide, row * sizeof(Line));
1996                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1997         }
1998         for(i += row; i < term.row; i++) {
1999                 free(term.line[i]);
2000                 free(term.alt[i]);
2001         }
2002
2003         /* resize to new height */
2004         term.line = xrealloc(term.line, row * sizeof(Line));
2005         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2006         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2007         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2008
2009         /* resize each row to new width, zero-pad if needed */
2010         for(i = 0; i < minrow; i++) {
2011                 term.dirty[i] = 1;
2012                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2013                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2014                 for(x = mincol; x < col; x++) {
2015                         term.line[i][x].state = 0;
2016                         term.alt[i][x].state = 0;
2017                 }
2018         }
2019
2020         /* allocate any new rows */
2021         for(/* i == minrow */; i < row; i++) {
2022                 term.dirty[i] = 1;
2023                 term.line[i] = xcalloc(col, sizeof(Glyph));
2024                 term.alt [i] = xcalloc(col, sizeof(Glyph));
2025         }
2026         if(col > term.col) {
2027                 bp = term.tabs + term.col;
2028
2029                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2030                 while(--bp > term.tabs && !*bp)
2031                         /* nothing */ ;
2032                 for(bp += TAB; bp < term.tabs + col; bp += TAB)
2033                         *bp = 1;
2034         }
2035         /* update terminal size */
2036         term.col = col, term.row = row;
2037         /* make use of the LIMIT in tmoveto */
2038         tmoveto(term.c.x, term.c.y);
2039         /* reset scrolling region */
2040         tsetscroll(0, row-1);
2041
2042         return (slide > 0);
2043 }
2044
2045 void
2046 xresize(int col, int row) {
2047         xw.tw = MAX(1, 2*BORDER + col * xw.cw);
2048         xw.th = MAX(1, 2*BORDER + row * xw.ch);
2049
2050         XftDrawChange(xw.xft_draw, xw.buf);
2051 }
2052
2053 void
2054 xloadcols(void) {
2055         int i, r, g, b;
2056         XRenderColor xft_color = { .alpha = 0 };
2057
2058         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2059         for(i = 0; i < LEN(colorname); i++) {
2060                 if(!colorname[i])
2061                         continue;
2062                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.xft_col[i])) {
2063                         die("Could not allocate color '%s'\n", colorname[i]);
2064                 }
2065         }
2066
2067         /* load colors [16-255] ; same colors as xterm */
2068         for(i = 16, r = 0; r < 6; r++) {
2069                 for(g = 0; g < 6; g++) {
2070                         for(b = 0; b < 6; b++) {
2071                                 xft_color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
2072                                 xft_color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
2073                                 xft_color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
2074                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &xft_color, &dc.xft_col[i])) {
2075                                         die("Could not allocate color %d\n", i);
2076                                 }
2077                                 i++;
2078                         }
2079                 }
2080         }
2081
2082         for(r = 0; r < 24; r++, i++) {
2083                 xft_color.red = xft_color.green = xft_color.blue = 0x0808 + 0x0a0a * r;
2084                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &xft_color,
2085                                         &dc.xft_col[i])) {
2086                         die("Could not allocate color %d\n", i);
2087                 }
2088         }
2089 }
2090
2091 void
2092 xtermclear(int col1, int row1, int col2, int row2) {
2093         XftDrawRect(xw.xft_draw,
2094                         &dc.xft_col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG],
2095                         BORDER + col1 * xw.cw,
2096                         BORDER + row1 * xw.ch,
2097                         (col2-col1+1) * xw.cw,
2098                         (row2-row1+1) * xw.ch);
2099 }
2100
2101 /*
2102  * Absolute coordinates.
2103  */
2104 void
2105 xclear(int x1, int y1, int x2, int y2) {
2106         XftDrawRect(xw.xft_draw,
2107                         &dc.xft_col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG],
2108                         x1, y1, x2-x1, y2-y1);
2109 }
2110
2111 void
2112 xhints(void) {
2113         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
2114         XWMHints wm = {.flags = InputHint, .input = 1};
2115         XSizeHints *sizeh = NULL;
2116
2117         sizeh = XAllocSizeHints();
2118         if(xw.isfixed == False) {
2119                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2120                 sizeh->height = xw.h;
2121                 sizeh->width = xw.w;
2122                 sizeh->height_inc = xw.ch;
2123                 sizeh->width_inc = xw.cw;
2124                 sizeh->base_height = 2*BORDER;
2125                 sizeh->base_width = 2*BORDER;
2126         } else {
2127                 sizeh->flags = PMaxSize | PMinSize;
2128                 sizeh->min_width = sizeh->max_width = xw.fw;
2129                 sizeh->min_height = sizeh->max_height = xw.fh;
2130         }
2131
2132         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2133         XFree(sizeh);
2134 }
2135
2136 void
2137 xinitfont(Font *f, char *fontstr) {
2138         FcPattern *pattern, *match;
2139         FcResult result;
2140
2141         pattern = FcNameParse((FcChar8 *)fontstr);
2142         if(!pattern)
2143                 die("st: can't open font %s\n", fontstr);
2144
2145         match = XftFontMatch(xw.dpy, xw.scr, pattern, &result);
2146         FcPatternDestroy(pattern);
2147         if(!match)
2148                 die("st: can't open font %s\n", fontstr);
2149         if(!(f->xft_set = XftFontOpenPattern(xw.dpy, match))) {
2150                 FcPatternDestroy(match);
2151                 die("st: can't open font %s.\n", fontstr);
2152         }
2153
2154         f->ascent = f->xft_set->ascent;
2155         f->descent = f->xft_set->descent;
2156         f->lbearing = 0;
2157         f->rbearing = f->xft_set->max_advance_width;
2158
2159         f->height = f->xft_set->height;
2160         f->width = f->lbearing + f->rbearing;
2161 }
2162
2163 void
2164 initfonts(char *fontstr) {
2165         char *fstr;
2166
2167         xinitfont(&dc.font, fontstr);
2168         xw.cw = dc.font.width;
2169         xw.ch = dc.font.height;
2170
2171         fstr = smstrcat(fontstr, ":weight=bold", NULL);
2172         xinitfont(&dc.bfont, fstr);
2173         free(fstr);
2174
2175         fstr = smstrcat(fontstr, ":slant=italic,oblique", NULL);
2176         xinitfont(&dc.ifont, fstr);
2177         free(fstr);
2178
2179         fstr = smstrcat(fontstr, ":weight=bold:slant=italic,oblique", NULL);
2180         xinitfont(&dc.ibfont, fstr);
2181         free(fstr);
2182 }
2183
2184 void
2185 xinit(void) {
2186         XSetWindowAttributes attrs;
2187         Cursor cursor;
2188         Window parent;
2189         int sw, sh, major, minor;
2190
2191         if(!(xw.dpy = XOpenDisplay(NULL)))
2192                 die("Can't open display\n");
2193         xw.scr = XDefaultScreen(xw.dpy);
2194         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2195
2196         /* font */
2197         initfonts((opt_font != NULL)? opt_font : FONT);
2198
2199         /* colors */
2200         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2201         xloadcols();
2202
2203         /* adjust fixed window geometry */
2204         if(xw.isfixed) {
2205                 sw = DisplayWidth(xw.dpy, xw.scr);
2206                 sh = DisplayHeight(xw.dpy, xw.scr);
2207                 if(xw.fx < 0)
2208                         xw.fx = sw + xw.fx - xw.fw - 1;
2209                 if(xw.fy < 0)
2210                         xw.fy = sh + xw.fy - xw.fh - 1;
2211
2212                 xw.h = xw.fh;
2213                 xw.w = xw.fw;
2214         } else {
2215                 /* window - default size */
2216                 xw.h = 2*BORDER + term.row * xw.ch;
2217                 xw.w = 2*BORDER + term.col * xw.cw;
2218                 xw.fx = 0;
2219                 xw.fy = 0;
2220         }
2221
2222         attrs.background_pixel = dc.xft_col[DefaultBG].pixel;
2223         attrs.border_pixel = dc.xft_col[DefaultBG].pixel;
2224         attrs.bit_gravity = NorthWestGravity;
2225         attrs.event_mask = FocusChangeMask | KeyPressMask
2226                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2227                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2228         attrs.colormap = xw.cmap;
2229
2230         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
2231         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2232                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2233                         xw.vis,
2234                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2235                         | CWColormap,
2236                         &attrs);
2237
2238         /* double buffering */
2239         if(!XdbeQueryExtension(xw.dpy, &major, &minor))
2240                 die("Xdbe extension is not present\n");
2241         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
2242
2243         /* Xft rendering context */
2244         xw.xft_draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2245
2246         /* input methods */
2247         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
2248         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2249                                            | XIMStatusNothing, XNClientWindow, xw.win,
2250                                            XNFocusWindow, xw.win, NULL);
2251         /* gc */
2252         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
2253
2254         /* white cursor, black outline */
2255         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2256         XDefineCursor(xw.dpy, xw.win, cursor);
2257         XRecolorCursor(xw.dpy, cursor,
2258                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2259                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2260
2261         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2262         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2263         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2264
2265         xresettitle();
2266         XMapWindow(xw.dpy, xw.win);
2267         xhints();
2268         XSync(xw.dpy, 0);
2269 }
2270
2271 void
2272 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2273         int winx = BORDER + x * xw.cw, winy = BORDER + y * xw.ch,
2274             width = charlen * xw.cw;
2275         Font *font = &dc.font;
2276         XGlyphInfo extents;
2277         XftColor *fg = &dc.xft_col[base.fg], *bg = &dc.xft_col[base.bg],
2278                  *temp, revfg, revbg;
2279         XRenderColor colfg, colbg;
2280
2281         if(base.mode & ATTR_REVERSE)
2282                 temp = fg, fg = bg, bg = temp;
2283
2284         if(base.mode & ATTR_BOLD) {
2285                 if(BETWEEN(base.fg, 0, 7)) {
2286                         /* basic system colors */
2287                         fg = &dc.xft_col[base.fg + 8];
2288                 } else if(BETWEEN(base.fg, 16, 195)) {
2289                         /* 256 colors */
2290                         fg = &dc.xft_col[base.fg + 36];
2291                 } else if(BETWEEN(base.fg, 232, 251)) {
2292                         /* greyscale */
2293                         fg = &dc.xft_col[base.fg + 4];
2294                 }
2295                 /*
2296                  * Those ranges will not be brightened:
2297                  *      8 - 15 – bright system colors
2298                  *      196 - 231 – highest 256 color cube
2299                  *      252 - 255 – brightest colors in grescale
2300                  */
2301                 font = &dc.bfont;
2302         }
2303
2304         if(base.mode & ATTR_ITALIC)
2305                 font = &dc.ifont;
2306         if(base.mode & (ATTR_ITALIC|ATTR_ITALIC))
2307                 font = &dc.ibfont;
2308
2309         if(IS_SET(MODE_REVERSE)) {
2310                 if(fg == &dc.xft_col[DefaultFG]) {
2311                         fg = &dc.xft_col[DefaultBG];
2312                 } else {
2313                         colfg.red = ~fg->color.red;
2314                         colfg.green = ~fg->color.green;
2315                         colfg.blue = ~fg->color.blue;
2316                         colfg.alpha = fg->color.alpha;
2317                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
2318                         fg = &revfg;
2319                 }
2320
2321                 if(bg == &dc.xft_col[DefaultBG]) {
2322                         bg = &dc.xft_col[DefaultFG];
2323                 } else {
2324                         colbg.red = ~bg->color.red;
2325                         colbg.green = ~bg->color.green;
2326                         colbg.blue = ~bg->color.blue;
2327                         colbg.alpha = bg->color.alpha;
2328                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
2329                         bg = &revbg;
2330                 }
2331         }
2332
2333         XftTextExtentsUtf8(xw.dpy, font->xft_set, (FcChar8 *)s, bytelen,
2334                         &extents);
2335         width = extents.xOff;
2336
2337         /* Intelligent cleaning up of the borders. */
2338         if(x == 0) {
2339                 xclear(0, (y == 0)? 0 : winy, BORDER,
2340                         winy + xw.ch + (y == term.row-1)? xw.h : 0);
2341         }
2342         if(x + charlen >= term.col-1) {
2343                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
2344                         winy + xw.ch + (y == term.row-1)? xw.h : 0);
2345         }
2346         if(y == 0)
2347                 xclear(winx, 0, winx + width, BORDER);
2348         if(y == term.row-1)
2349                 xclear(winx, winy + xw.ch, winx + width, xw.h);
2350
2351         XftDrawRect(xw.xft_draw, bg, winx, winy, width, xw.ch);
2352         XftDrawStringUtf8(xw.xft_draw, fg, font->xft_set, winx,
2353                         winy + font->ascent, (FcChar8 *)s, bytelen);
2354
2355         if(base.mode & ATTR_UNDERLINE) {
2356                 XftDrawRect(xw.xft_draw, fg, winx, winy + font->ascent + 1,
2357                                 width, 1);
2358         }
2359 }
2360
2361 void
2362 xdrawcursor(void) {
2363         static int oldx = 0, oldy = 0;
2364         int sl;
2365         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
2366
2367         LIMIT(oldx, 0, term.col-1);
2368         LIMIT(oldy, 0, term.row-1);
2369
2370         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2371                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2372
2373         /* remove the old cursor */
2374         if(term.line[oldy][oldx].state & GLYPH_SET) {
2375                 sl = utf8size(term.line[oldy][oldx].c);
2376                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
2377                                 oldy, 1, sl);
2378         } else {
2379                 xtermclear(oldx, oldy, oldx, oldy);
2380         }
2381
2382         /* draw the new one */
2383         if(!(term.c.state & CURSOR_HIDE)) {
2384                 if(!(xw.state & WIN_FOCUSED))
2385                         g.bg = DefaultUCS;
2386
2387                 if(IS_SET(MODE_REVERSE))
2388                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2389
2390                 sl = utf8size(g.c);
2391                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2392                 oldx = term.c.x, oldy = term.c.y;
2393         }
2394 }
2395
2396 void
2397 xresettitle(void) {
2398         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2399 }
2400
2401 void
2402 redraw(void) {
2403         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2404
2405         tfulldirt();
2406         draw();
2407         XSync(xw.dpy, False); /* necessary for a good tput flash */
2408         nanosleep(&tv, NULL);
2409 }
2410
2411 void
2412 draw(void) {
2413         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2414
2415         drawregion(0, 0, term.col, term.row);
2416         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2417 }
2418
2419 void
2420 drawregion(int x1, int y1, int x2, int y2) {
2421         int ic, ib, x, y, ox, sl;
2422         Glyph base, new;
2423         char buf[DRAW_BUF_SIZ];
2424         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
2425
2426         if((sel.alt && !alt) || (!sel.alt && alt))
2427                 ena_sel = 0;
2428         if(!(xw.state & WIN_VISIBLE))
2429                 return;
2430
2431         for(y = y1; y < y2; y++) {
2432                 if(!term.dirty[y])
2433                         continue;
2434
2435                 xtermclear(0, y, term.col, y);
2436                 term.dirty[y] = 0;
2437                 base = term.line[y][0];
2438                 ic = ib = ox = 0;
2439                 for(x = x1; x < x2; x++) {
2440                         new = term.line[y][x];
2441                         if(ena_sel && *(new.c) && selected(x, y))
2442                                 new.mode ^= ATTR_REVERSE;
2443                         if(ib > 0 && (!(new.state & GLYPH_SET)
2444                                         || ATTRCMP(base, new)
2445                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2446                                 xdraws(buf, base, ox, y, ic, ib);
2447                                 ic = ib = 0;
2448                         }
2449                         if(new.state & GLYPH_SET) {
2450                                 if(ib == 0) {
2451                                         ox = x;
2452                                         base = new;
2453                                 }
2454                                 sl = utf8size(new.c);
2455                                 memcpy(buf+ib, new.c, sl);
2456                                 ib += sl;
2457                                 ++ic;
2458                         }
2459                 }
2460                 if(ib > 0)
2461                         xdraws(buf, base, ox, y, ic, ib);
2462         }
2463         xdrawcursor();
2464 }
2465
2466 void
2467 expose(XEvent *ev) {
2468         XExposeEvent *e = &ev->xexpose;
2469
2470         if(xw.state & WIN_REDRAW) {
2471                 if(!e->count)
2472                         xw.state &= ~WIN_REDRAW;
2473         }
2474 }
2475
2476 void
2477 visibility(XEvent *ev) {
2478         XVisibilityEvent *e = &ev->xvisibility;
2479
2480         if(e->state == VisibilityFullyObscured) {
2481                 xw.state &= ~WIN_VISIBLE;
2482         } else if(!(xw.state & WIN_VISIBLE)) {
2483                 /* need a full redraw for next Expose, not just a buf copy */
2484                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2485         }
2486 }
2487
2488 void
2489 unmap(XEvent *ev) {
2490         xw.state &= ~WIN_VISIBLE;
2491 }
2492
2493 void
2494 xseturgency(int add) {
2495         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2496
2497         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2498         XSetWMHints(xw.dpy, xw.win, h);
2499         XFree(h);
2500 }
2501
2502 void
2503 focus(XEvent *ev) {
2504         if(ev->type == FocusIn) {
2505                 xw.state |= WIN_FOCUSED;
2506                 xseturgency(0);
2507         } else {
2508                 xw.state &= ~WIN_FOCUSED;
2509         }
2510 }
2511
2512 char*
2513 kmap(KeySym k, uint state) {
2514         int i;
2515         uint mask;
2516
2517         state &= ~Mod2Mask;
2518         for(i = 0; i < LEN(key); i++) {
2519                 mask = key[i].mask;
2520
2521                 if(key[i].k == k && ((state & mask) == mask
2522                                 || (mask == XK_NO_MOD && !state))) {
2523                         return (char*)key[i].s;
2524                 }
2525         }
2526         return NULL;
2527 }
2528
2529 void
2530 kpress(XEvent *ev) {
2531         XKeyEvent *e = &ev->xkey;
2532         KeySym ksym;
2533         char buf[32];
2534         char *customkey;
2535         int len;
2536         int meta;
2537         int shift;
2538         Status status;
2539
2540         if (IS_SET(MODE_KBDLOCK))
2541                 return;
2542
2543         meta = e->state & Mod1Mask;
2544         shift = e->state & ShiftMask;
2545         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2546
2547         /* 1. custom keys from config.h */
2548         if((customkey = kmap(ksym, e->state))) {
2549                 ttywrite(customkey, strlen(customkey));
2550         /* 2. hardcoded (overrides X lookup) */
2551         } else {
2552                 switch(ksym) {
2553                 case XK_Up:
2554                 case XK_Down:
2555                 case XK_Left:
2556                 case XK_Right:
2557                         /* XXX: shift up/down doesn't work */
2558                         sprintf(buf, "\033%c%c",
2559                                 IS_SET(MODE_APPKEYPAD) ? 'O' : '[',
2560                                 (shift ? "dacb":"DACB")[ksym - XK_Left]);
2561                         ttywrite(buf, 3);
2562                         break;
2563                 case XK_Insert:
2564                         if(shift)
2565                                 selpaste();
2566                         break;
2567                 case XK_Return:
2568                         if(IS_SET(MODE_CRLF)) {
2569                                 ttywrite("\r\n", 2);
2570                         } else {
2571                                 ttywrite("\r", 1);
2572                         }
2573                         break;
2574                         /* 3. X lookup  */
2575                 default:
2576                         if(len > 0) {
2577                                 if(meta && len == 1)
2578                                         ttywrite("\033", 1);
2579                                 ttywrite(buf, len);
2580                         }
2581                         break;
2582                 }
2583         }
2584 }
2585
2586 void
2587 cmessage(XEvent *e) {
2588         /* See xembed specs
2589            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2590         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2591                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2592                         xw.state |= WIN_FOCUSED;
2593                         xseturgency(0);
2594                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2595                         xw.state &= ~WIN_FOCUSED;
2596                 }
2597         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
2598                 /* Send SIGHUP to shell */
2599                 kill(pid, SIGHUP);
2600                 exit(EXIT_SUCCESS);
2601         }
2602 }
2603
2604 void
2605 resize(XEvent *e) {
2606         int col, row;
2607
2608         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2609                 return;
2610
2611         xw.w = e->xconfigure.width;
2612         xw.h = e->xconfigure.height;
2613         col = (xw.w - 2*BORDER) / xw.cw;
2614         row = (xw.h - 2*BORDER) / xw.ch;
2615         if(col == term.col && row == term.row)
2616                 return;
2617
2618         tresize(col, row);
2619         xresize(col, row);
2620         ttyresize();
2621 }
2622
2623 void
2624 run(void) {
2625         XEvent ev;
2626         fd_set rfd;
2627         int xfd = XConnectionNumber(xw.dpy), i;
2628         struct timeval drawtimeout, *tv = NULL;
2629
2630         for(i = 0;; i++) {
2631                 FD_ZERO(&rfd);
2632                 FD_SET(cmdfd, &rfd);
2633                 FD_SET(xfd, &rfd);
2634                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
2635                         if(errno == EINTR)
2636                                 continue;
2637                         die("select failed: %s\n", SERRNO);
2638                 }
2639
2640                 /*
2641                  * Stop after a certain number of reads so the user does not
2642                  * feel like the system is stuttering.
2643                  */
2644                 if(i < 1000 && FD_ISSET(cmdfd, &rfd)) {
2645                         ttyread();
2646
2647                         /*
2648                          * Just wait a bit so it isn't disturbing the
2649                          * user and the system is able to write something.
2650                          */
2651                         drawtimeout.tv_sec = 0;
2652                         drawtimeout.tv_usec = 5;
2653                         tv = &drawtimeout;
2654                         continue;
2655                 }
2656                 i = 0;
2657                 tv = NULL;
2658
2659                 while(XPending(xw.dpy)) {
2660                         XNextEvent(xw.dpy, &ev);
2661                         if(XFilterEvent(&ev, xw.win))
2662                                 continue;
2663                         if(handler[ev.type])
2664                                 (handler[ev.type])(&ev);
2665                 }
2666
2667                 draw();
2668                 XFlush(xw.dpy);
2669         }
2670 }
2671
2672 int
2673 main(int argc, char *argv[]) {
2674         int i, bitm, xr, yr;
2675         uint wr, hr;
2676
2677         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2678         xw.isfixed = False;
2679
2680         for(i = 1; i < argc; i++) {
2681                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2682                 case 'c':
2683                         if(++i < argc)
2684                                 opt_class = argv[i];
2685                         break;
2686                 case 'e':
2687                         /* eat every remaining arguments */
2688                         if(++i < argc)
2689                                 opt_cmd = &argv[i];
2690                         goto run;
2691                 case 'f':
2692                         if(++i < argc)
2693                                 opt_font = argv[i];
2694                         break;
2695                 case 'g':
2696                         if(++i >= argc)
2697                                 break;
2698
2699                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2700                         if(bitm & XValue)
2701                                 xw.fx = xr;
2702                         if(bitm & YValue)
2703                                 xw.fy = yr;
2704                         if(bitm & WidthValue)
2705                                 xw.fw = (int)wr;
2706                         if(bitm & HeightValue)
2707                                 xw.fh = (int)hr;
2708                         if(bitm & XNegative && xw.fx == 0)
2709                                 xw.fx = -1;
2710                         if(bitm & XNegative && xw.fy == 0)
2711                                 xw.fy = -1;
2712
2713                         if(xw.fh != 0 && xw.fw != 0)
2714                                 xw.isfixed = True;
2715                         break;
2716                 case 'o':
2717                         if(++i < argc)
2718                                 opt_io = argv[i];
2719                         break;
2720                 case 't':
2721                         if(++i < argc)
2722                                 opt_title = argv[i];
2723                         break;
2724                 case 'v':
2725                 default:
2726                         die(USAGE);
2727                 case 'w':
2728                         if(++i < argc)
2729                                 opt_embed = argv[i];
2730                         break;
2731                 }
2732         }
2733
2734 run:
2735         setlocale(LC_CTYPE, "");
2736         tnew(80, 24);
2737         ttynew();
2738         xinit();
2739         selinit();
2740         run();
2741         return 0;
2742 }
2743