st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.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 <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <X11/XKBlib.h>
  31 #include <fontconfig/fontconfig.h>
  32 #include <wchar.h>
  33
  34 #include "arg.h"
  35
  36 char *argv0;
  37
  38 #define Glyph Glyph_
  39 #define Font Font_
  40
  41 #if   defined(__linux)
  42  #include <pty.h>
  43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  44  #include <util.h>
  45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  46  #include <libutil.h>
  47 #endif
  48
  49
  50 /* XEMBED messages */
  51 #define XEMBED_FOCUS_IN  4
  52 #define XEMBED_FOCUS_OUT 5
  53
  54 /* Arbitrary sizes */
  55 #define UTF_INVALID   0xFFFD
  56 #define UTF_SIZ       4
  57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  58 #define ESC_ARG_SIZ   16
  59 #define STR_BUF_SIZ   ESC_BUF_SIZ
  60 #define STR_ARG_SIZ   ESC_ARG_SIZ
  61 #define DRAW_BUF_SIZ  20*1024
  62 #define XK_ANY_MOD    UINT_MAX
  63 #define XK_NO_MOD     0
  64 #define XK_SWITCH_MOD (1<<13)
  65
  66 /* macros */
  67 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  68 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  69 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  70 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  71 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  72 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  73 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  74 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  75 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  76 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  77 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  78 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  79 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  80
  81 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  82 #define IS_TRUECOL(x)    (1 << 24 & (x))
  83 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  84 #define TRUEGREEN(x)     (((x) & 0xff00))
  85 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  86
  87
  88 enum glyph_attribute {
  89         ATTR_NULL      = 0,
  90         ATTR_BOLD      = 1 << 0,
  91         ATTR_FAINT     = 1 << 1,
  92         ATTR_ITALIC    = 1 << 2,
  93         ATTR_UNDERLINE = 1 << 3,
  94         ATTR_BLINK     = 1 << 4,
  95         ATTR_REVERSE   = 1 << 5,
  96         ATTR_INVISIBLE = 1 << 6,
  97         ATTR_STRUCK    = 1 << 7,
  98         ATTR_WRAP      = 1 << 8,
  99         ATTR_WIDE      = 1 << 9,
 100         ATTR_WDUMMY    = 1 << 10,
 101 };
 102
 103 enum cursor_movement {
 104         CURSOR_SAVE,
 105         CURSOR_LOAD
 106 };
 107
 108 enum cursor_state {
 109         CURSOR_DEFAULT  = 0,
 110         CURSOR_WRAPNEXT = 1,
 111         CURSOR_ORIGIN   = 2
 112 };
 113
 114 enum term_mode {
 115         MODE_WRAP        = 1 << 0,
 116         MODE_INSERT      = 1 << 1,
 117         MODE_APPKEYPAD   = 1 << 2,
 118         MODE_ALTSCREEN   = 1 << 3,
 119         MODE_CRLF        = 1 << 4,
 120         MODE_MOUSEBTN    = 1 << 5,
 121         MODE_MOUSEMOTION = 1 << 6,
 122         MODE_REVERSE     = 1 << 7,
 123         MODE_KBDLOCK     = 1 << 8,
 124         MODE_HIDE        = 1 << 9,
 125         MODE_ECHO        = 1 << 10,
 126         MODE_APPCURSOR   = 1 << 11,
 127         MODE_MOUSESGR    = 1 << 12,
 128         MODE_8BIT        = 1 << 13,
 129         MODE_BLINK       = 1 << 14,
 130         MODE_FBLINK      = 1 << 15,
 131         MODE_FOCUS       = 1 << 16,
 132         MODE_MOUSEX10    = 1 << 17,
 133         MODE_MOUSEMANY   = 1 << 18,
 134         MODE_BRCKTPASTE  = 1 << 19,
 135         MODE_PRINT       = 1 << 20,
 136         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 137                           |MODE_MOUSEMANY,
 138 };
 139
 140 enum charset {
 141         CS_GRAPHIC0,
 142         CS_GRAPHIC1,
 143         CS_UK,
 144         CS_USA,
 145         CS_MULTI,
 146         CS_GER,
 147         CS_FIN
 148 };
 149
 150 enum escape_state {
 151         ESC_START      = 1,
 152         ESC_CSI        = 2,
 153         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 154         ESC_ALTCHARSET = 8,
 155         ESC_STR_END    = 16, /* a final string was encountered */
 156         ESC_TEST       = 32, /* Enter in test mode */
 157 };
 158
 159 enum window_state {
 160         WIN_VISIBLE = 1,
 161         WIN_REDRAW  = 2,
 162         WIN_FOCUSED = 4
 163 };
 164
 165 enum selection_type {
 166         SEL_REGULAR = 1,
 167         SEL_RECTANGULAR = 2
 168 };
 169
 170 enum selection_snap {
 171         SNAP_WORD = 1,
 172         SNAP_LINE = 2
 173 };
 174
 175 typedef unsigned char uchar;
 176 typedef unsigned int uint;
 177 typedef unsigned long ulong;
 178 typedef unsigned short ushort;
 179
 180 typedef XftDraw *Draw;
 181 typedef XftColor Color;
 182
 183 typedef struct {
 184         char c[UTF_SIZ]; /* character code */
 185         ushort mode;      /* attribute flags */
 186         uint32_t fg;      /* foreground  */
 187         uint32_t bg;      /* background  */
 188 } Glyph;
 189
 190 typedef Glyph *Line;
 191
 192 typedef struct {
 193         Glyph attr; /* current char attributes */
 194         int x;
 195         int y;
 196         char state;
 197 } TCursor;
 198
 199 /* CSI Escape sequence structs */
 200 /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
 201 typedef struct {
 202         char buf[ESC_BUF_SIZ]; /* raw string */
 203         int len;               /* raw string length */
 204         char priv;
 205         int arg[ESC_ARG_SIZ];
 206         int narg;              /* nb of args */
 207         char mode[2];
 208 } CSIEscape;
 209
 210 /* STR Escape sequence structs */
 211 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 212 typedef struct {
 213         char type;             /* ESC type ... */
 214         char buf[STR_BUF_SIZ]; /* raw string */
 215         int len;               /* raw string length */
 216         char *args[STR_ARG_SIZ];
 217         int narg;              /* nb of args */
 218 } STREscape;
 219
 220 /* Internal representation of the screen */
 221 typedef struct {
 222         int row;      /* nb row */
 223         int col;      /* nb col */
 224         Line *line;   /* screen */
 225         Line *alt;    /* alternate screen */
 226         bool *dirty;  /* dirtyness of lines */
 227         TCursor c;    /* cursor */
 228         int top;      /* top    scroll limit */
 229         int bot;      /* bottom scroll limit */
 230         int mode;     /* terminal mode flags */
 231         int esc;      /* escape state flags */
 232         char trantbl[4]; /* charset table translation */
 233         int charset;  /* current charset */
 234         int icharset; /* selected charset for sequence */
 235         bool numlock; /* lock numbers in keyboard */
 236         bool *tabs;
 237 } Term;
 238
 239 /* Purely graphic info */
 240 typedef struct {
 241         Display *dpy;
 242         Colormap cmap;
 243         Window win;
 244         Drawable buf;
 245         Atom xembed, wmdeletewin, netwmname, netwmpid;
 246         XIM xim;
 247         XIC xic;
 248         Draw draw;
 249         Visual *vis;
 250         XSetWindowAttributes attrs;
 251         int scr;
 252         bool isfixed; /* is fixed geometry? */
 253         int l, t; /* left and top offset */
 254         int gm; /* geometry mask */
 255         int tw, th; /* tty width and height */
 256         int w, h; /* window width and height */
 257         int ch; /* char height */
 258         int cw; /* char width  */
 259         char state; /* focus, redraw, visible */
 260         int cursor; /* cursor style */
 261 } XWindow;
 262
 263 typedef struct {
 264         uint b;
 265         uint mask;
 266         char *s;
 267 } Mousekey;
 268
 269 typedef struct {
 270         KeySym k;
 271         uint mask;
 272         char *s;
 273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 274         signed char appkey;    /* application keypad */
 275         signed char appcursor; /* application cursor */
 276         signed char crlf;      /* crlf mode          */
 277 } Key;
 278
 279 typedef struct {
 280         int mode;
 281         int type;
 282         int snap;
 283         /*
 284          * Selection variables:
 285          * nb – normalized coordinates of the beginning of the selection
 286          * ne – normalized coordinates of the end of the selection
 287          * ob – original coordinates of the beginning of the selection
 288          * oe – original coordinates of the end of the selection
 289          */
 290         struct {
 291                 int x, y;
 292         } nb, ne, ob, oe;
 293
 294         char *primary, *clipboard;
 295         Atom xtarget;
 296         bool alt;
 297         struct timespec tclick1;
 298         struct timespec tclick2;
 299 } Selection;
 300
 301 typedef union {
 302         int i;
 303         uint ui;
 304         float f;
 305         const void *v;
 306 } Arg;
 307
 308 typedef struct {
 309         uint mod;
 310         KeySym keysym;
 311         void (*func)(const Arg *);
 312         const Arg arg;
 313 } Shortcut;
 314
 315 /* function definitions used in config.h */
 316 static void clipcopy(const Arg *);
 317 static void clippaste(const Arg *);
 318 static void numlock(const Arg *);
 319 static void selpaste(const Arg *);
 320 static void xzoom(const Arg *);
 321 static void xzoomabs(const Arg *);
 322 static void xzoomreset(const Arg *);
 323 static void printsel(const Arg *);
 324 static void printscreen(const Arg *) ;
 325 static void toggleprinter(const Arg *);
 326
 327 /* Config.h for applying patches and the configuration. */
 328 #include "config.h"
 329
 330 /* Font structure */
 331 typedef struct {
 332         int height;
 333         int width;
 334         int ascent;
 335         int descent;
 336         short lbearing;
 337         short rbearing;
 338         XftFont *match;
 339         FcFontSet *set;
 340         FcPattern *pattern;
 341 } Font;
 342
 343 /* Drawing Context */
 344 typedef struct {
 345         Color col[MAX(LEN(colorname), 256)];
 346         Font font, bfont, ifont, ibfont;
 347         GC gc;
 348 } DC;
 349
 350 static void die(const char *, ...);
 351 static void draw(void);
 352 static void redraw(void);
 353 static void drawregion(int, int, int, int);
 354 static void execsh(void);
 355 static void sigchld(int);
 356 static void run(void);
 357
 358 static void csidump(void);
 359 static void csihandle(void);
 360 static void csiparse(void);
 361 static void csireset(void);
 362 static int eschandle(uchar);
 363 static void strdump(void);
 364 static void strhandle(void);
 365 static void strparse(void);
 366 static void strreset(void);
 367
 368 static int tattrset(int);
 369 static void tprinter(char *, size_t);
 370 static void tdumpsel(void);
 371 static void tdumpline(int);
 372 static void tdump(void);
 373 static void tclearregion(int, int, int, int);
 374 static void tcursor(int);
 375 static void tdeletechar(int);
 376 static void tdeleteline(int);
 377 static void tinsertblank(int);
 378 static void tinsertblankline(int);
 379 static int tlinelen(int);
 380 static void tmoveto(int, int);
 381 static void tmoveato(int, int);
 382 static void tnew(int, int);
 383 static void tnewline(int);
 384 static void tputtab(int);
 385 static void tputc(char *, int);
 386 static void treset(void);
 387 static void tresize(int, int);
 388 static void tscrollup(int, int);
 389 static void tscrolldown(int, int);
 390 static void tsetattr(int *, int);
 391 static void tsetchar(char *, Glyph *, int, int);
 392 static void tsetscroll(int, int);
 393 static void tswapscreen(void);
 394 static void tsetdirt(int, int);
 395 static void tsetdirtattr(int);
 396 static void tsetmode(bool, bool, int *, int);
 397 static void tfulldirt(void);
 398 static void techo(char *, int);
 399 static void tcontrolcode(uchar );
 400 static void tdectest(char );
 401 static int32_t tdefcolor(int *, int *, int);
 402 static void tdeftran(char);
 403 static inline bool match(uint, uint);
 404 static void ttynew(void);
 405 static void ttyread(void);
 406 static void ttyresize(void);
 407 static void ttysend(char *, size_t);
 408 static void ttywrite(const char *, size_t);
 409 static void tstrsequence(uchar);
 410
 411 static inline ushort sixd_to_16bit(int);
 412 static void xdraws(char *, Glyph, int, int, int, int);
 413 static void xhints(void);
 414 static void xclear(int, int, int, int);
 415 static void xdrawcursor(void);
 416 static void xinit(void);
 417 static void xloadcols(void);
 418 static int xsetcolorname(int, const char *);
 419 static int xgeommasktogravity(int);
 420 static int xloadfont(Font *, FcPattern *);
 421 static void xloadfonts(char *, double);
 422 static int xloadfontset(Font *);
 423 static void xsettitle(char *);
 424 static void xresettitle(void);
 425 static void xsetpointermotion(int);
 426 static void xseturgency(int);
 427 static void xsetsel(char *);
 428 static void xtermclear(int, int, int, int);
 429 static void xunloadfont(Font *);
 430 static void xunloadfonts(void);
 431 static void xresize(int, int);
 432
 433 static void expose(XEvent *);
 434 static void visibility(XEvent *);
 435 static void unmap(XEvent *);
 436 static char *kmap(KeySym, uint);
 437 static void kpress(XEvent *);
 438 static void cmessage(XEvent *);
 439 static void cresize(int, int);
 440 static void resize(XEvent *);
 441 static void focus(XEvent *);
 442 static void brelease(XEvent *);
 443 static void bpress(XEvent *);
 444 static void bmotion(XEvent *);
 445 static void selnotify(XEvent *);
 446 static void selclear(XEvent *);
 447 static void selrequest(XEvent *);
 448
 449 static void selinit(void);
 450 static void selnormalize(void);
 451 static inline bool selected(int, int);
 452 static char *getsel(void);
 453 static void selcopy(void);
 454 static void selscroll(int, int);
 455 static void selsnap(int, int *, int *, int);
 456 static int x2col(int);
 457 static int y2row(int);
 458 static void getbuttoninfo(XEvent *);
 459 static void mousereport(XEvent *);
 460
 461 static size_t utf8decode(char *, long *, size_t);
 462 static long utf8decodebyte(char, size_t *);
 463 static size_t utf8encode(long, char *, size_t);
 464 static char utf8encodebyte(long, size_t);
 465 static size_t utf8len(char *);
 466 static size_t utf8validate(long *, size_t);
 467
 468 static ssize_t xwrite(int, const char *, size_t);
 469 static void *xmalloc(size_t);
 470 static void *xrealloc(void *, size_t);
 471 static char *xstrdup(char *);
 472
 473 static void usage(void);
 474
 475 static void (*handler[LASTEvent])(XEvent *) = {
 476         [KeyPress] = kpress,
 477         [ClientMessage] = cmessage,
 478         [ConfigureNotify] = resize,
 479         [VisibilityNotify] = visibility,
 480         [UnmapNotify] = unmap,
 481         [Expose] = expose,
 482         [FocusIn] = focus,
 483         [FocusOut] = focus,
 484         [MotionNotify] = bmotion,
 485         [ButtonPress] = bpress,
 486         [ButtonRelease] = brelease,
 487 /*
 488  * Uncomment if you want the selection to disappear when you select something
 489  * different in another window.
 490  */
 491 /*      [SelectionClear] = selclear, */
 492         [SelectionNotify] = selnotify,
 493         [SelectionRequest] = selrequest,
 494 };
 495
 496 /* Globals */
 497 static DC dc;
 498 static XWindow xw;
 499 static Term term;
 500 static CSIEscape csiescseq;
 501 static STREscape strescseq;
 502 static int cmdfd;
 503 static pid_t pid;
 504 static Selection sel;
 505 static int iofd = STDOUT_FILENO;
 506 static char **opt_cmd = NULL;
 507 static char *opt_io = NULL;
 508 static char *opt_title = NULL;
 509 static char *opt_embed = NULL;
 510 static char *opt_class = NULL;
 511 static char *opt_font = NULL;
 512 static int oldbutton = 3; /* button event on startup: 3 = release */
 513
 514 static char *usedfont = NULL;
 515 static double usedfontsize = 0;
 516 static double defaultfontsize = 0;
 517
 518 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 519 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 520 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 521 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 522
 523 /* Font Ring Cache */
 524 enum {
 525         FRC_NORMAL,
 526         FRC_ITALIC,
 527         FRC_BOLD,
 528         FRC_ITALICBOLD
 529 };
 530
 531 typedef struct {
 532         XftFont *font;
 533         int flags;
 534         long unicodep;
 535 } Fontcache;
 536
 537 /* Fontcache is an array now. A new font will be appended to the array. */
 538 static Fontcache frc[16];
 539 static int frclen = 0;
 540
 541 ssize_t
 542 xwrite(int fd, const char *s, size_t len) {
 543         size_t aux = len;
 544
 545         while(len > 0) {
 546                 ssize_t r = write(fd, s, len);
 547                 if(r < 0)
 548                         return r;
 549                 len -= r;
 550                 s += r;
 551         }
 552         return aux;
 553 }
 554
 555 void *
 556 xmalloc(size_t len) {
 557         void *p = malloc(len);
 558
 559         if(!p)
 560                 die("Out of memory\n");
 561
 562         return p;
 563 }
 564
 565 void *
 566 xrealloc(void *p, size_t len) {
 567         if((p = realloc(p, len)) == NULL)
 568                 die("Out of memory\n");
 569
 570         return p;
 571 }
 572
 573 char *
 574 xstrdup(char *s) {
 575         if((s = strdup(s)) == NULL)
 576                 die("Out of memory\n");
 577
 578         return s;
 579 }
 580
 581 size_t
 582 utf8decode(char *c, long *u, size_t clen) {
 583         size_t i, j, len, type;
 584         long udecoded;
 585
 586         *u = UTF_INVALID;
 587         if(!clen)
 588                 return 0;
 589         udecoded = utf8decodebyte(c[0], &len);
 590         if(!BETWEEN(len, 1, UTF_SIZ))
 591                 return 1;
 592         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 593                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 594                 if(type != 0)
 595                         return j;
 596         }
 597         if(j < len)
 598                 return 0;
 599         *u = udecoded;
 600         utf8validate(u, len);
 601         return len;
 602 }
 603
 604 long
 605 utf8decodebyte(char c, size_t *i) {
 606         for(*i = 0; *i < LEN(utfmask); ++(*i))
 607                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 608                         return (uchar)c & ~utfmask[*i];
 609         return 0;
 610 }
 611
 612 size_t
 613 utf8encode(long u, char *c, size_t clen) {
 614         size_t len, i;
 615
 616         len = utf8validate(&u, 0);
 617         if(clen < len)
 618                 return 0;
 619         for(i = len - 1; i != 0; --i) {
 620                 c[i] = utf8encodebyte(u, 0);
 621                 u >>= 6;
 622         }
 623         c[0] = utf8encodebyte(u, len);
 624         return len;
 625 }
 626
 627 char
 628 utf8encodebyte(long u, size_t i) {
 629         return utfbyte[i] | (u & ~utfmask[i]);
 630 }
 631
 632 size_t
 633 utf8len(char *c) {
 634         return utf8decode(c, &(long){0}, UTF_SIZ);
 635 }
 636
 637 size_t
 638 utf8validate(long *u, size_t i) {
 639         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 640                 *u = UTF_INVALID;
 641         for(i = 1; *u > utfmax[i]; ++i)
 642                 ;
 643         return i;
 644 }
 645
 646 void
 647 selinit(void) {
 648         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 649         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 650         sel.mode = 0;
 651         sel.ob.x = -1;
 652         sel.primary = NULL;
 653         sel.clipboard = NULL;
 654         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 655         if(sel.xtarget == None)
 656                 sel.xtarget = XA_STRING;
 657 }
 658
 659 int
 660 x2col(int x) {
 661         x -= borderpx;
 662         x /= xw.cw;
 663
 664         return LIMIT(x, 0, term.col-1);
 665 }
 666
 667 int
 668 y2row(int y) {
 669         y -= borderpx;
 670         y /= xw.ch;
 671
 672         return LIMIT(y, 0, term.row-1);
 673 }
 674
 675 int tlinelen(int y) {
 676         int i = term.col;
 677
 678         if(term.line[y][i - 1].mode & ATTR_WRAP)
 679                 return i;
 680
 681         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
 682                 --i;
 683
 684         return i;
 685 }
 686
 687 void
 688 selnormalize(void) {
 689         int i;
 690
 691         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 692                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 693                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 694         } else {
 695                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 696                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 697         }
 698         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 699         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 700
 701         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
 702         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
 703
 704         /* expand selection over line breaks */
 705         if (sel.type == SEL_RECTANGULAR)
 706                 return;
 707         i = tlinelen(sel.nb.y);
 708         if (i < sel.nb.x)
 709                 sel.nb.x = i;
 710         if (tlinelen(sel.ne.y) <= sel.ne.x)
 711                 sel.ne.x = term.col - 1;
 712 }
 713
 714 bool
 715 selected(int x, int y) {
 716         if(sel.type == SEL_RECTANGULAR)
 717                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 718                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 719
 720         return BETWEEN(y, sel.nb.y, sel.ne.y)
 721             && (y != sel.nb.y || x >= sel.nb.x)
 722             && (y != sel.ne.y || x <= sel.ne.x);
 723 }
 724
 725 void
 726 selsnap(int mode, int *x, int *y, int direction) {
 727         int newx, newy, xt, yt;
 728         bool delim, prevdelim;
 729         Glyph *gp, *prevgp;
 730
 731         switch(mode) {
 732         case SNAP_WORD:
 733                 /*
 734                  * Snap around if the word wraps around at the end or
 735                  * beginning of a line.
 736                  */
 737                 prevgp = &term.line[*y][*x];
 738                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
 739                 for(;;) {
 740                         newx = *x + direction;
 741                         newy = *y;
 742                         if(!BETWEEN(newx, 0, term.col - 1)) {
 743                                 newy += direction;
 744                                 newx = (newx + term.col) % term.col;
 745                                 if (!BETWEEN(newy, 0, term.row - 1))
 746                                         break;
 747
 748                                 if(direction > 0)
 749                                         yt = *y, xt = *x;
 750                                 else
 751                                         yt = newy, xt = newx;
 752                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 753                                         break;
 754                         }
 755
 756                         if (newx >= tlinelen(newy))
 757                                 break;
 758
 759                         gp = &term.line[newy][newx];
 760                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
 761                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 762                                         || (delim && gp->c[0] != prevgp->c[0])))
 763                                 break;
 764
 765                         *x = newx;
 766                         *y = newy;
 767                         prevgp = gp;
 768                         prevdelim = delim;
 769                 }
 770                 break;
 771         case SNAP_LINE:
 772                 /*
 773                  * Snap around if the the previous line or the current one
 774                  * has set ATTR_WRAP at its end. Then the whole next or
 775                  * previous line will be selected.
 776                  */
 777                 *x = (direction < 0) ? 0 : term.col - 1;
 778                 if(direction < 0 && *y > 0) {
 779                         for(; *y > 0; *y += direction) {
 780                                 if(!(term.line[*y-1][term.col-1].mode
 781                                                 & ATTR_WRAP)) {
 782                                         break;
 783                                 }
 784                         }
 785                 } else if(direction > 0 && *y < term.row-1) {
 786                         for(; *y < term.row; *y += direction) {
 787                                 if(!(term.line[*y][term.col-1].mode
 788                                                 & ATTR_WRAP)) {
 789                                         break;
 790                                 }
 791                         }
 792                 }
 793                 break;
 794         }
 795 }
 796
 797 void
 798 getbuttoninfo(XEvent *e) {
 799         int type;
 800         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 801
 802         sel.alt = IS_SET(MODE_ALTSCREEN);
 803
 804         sel.oe.x = x2col(e->xbutton.x);
 805         sel.oe.y = y2row(e->xbutton.y);
 806         selnormalize();
 807
 808         sel.type = SEL_REGULAR;
 809         for(type = 1; type < LEN(selmasks); ++type) {
 810                 if(match(selmasks[type], state)) {
 811                         sel.type = type;
 812                         break;
 813                 }
 814         }
 815 }
 816
 817 void
 818 mousereport(XEvent *e) {
 819         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 820             button = e->xbutton.button, state = e->xbutton.state,
 821             len;
 822         char buf[40];
 823         static int ox, oy;
 824
 825         /* from urxvt */
 826         if(e->xbutton.type == MotionNotify) {
 827                 if(x == ox && y == oy)
 828                         return;
 829                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 830                         return;
 831                 /* MOUSE_MOTION: no reporting if no button is pressed */
 832                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 833                         return;
 834
 835                 button = oldbutton + 32;
 836                 ox = x;
 837                 oy = y;
 838         } else {
 839                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 840                         button = 3;
 841                 } else {
 842                         button -= Button1;
 843                         if(button >= 3)
 844                                 button += 64 - 3;
 845                 }
 846                 if(e->xbutton.type == ButtonPress) {
 847                         oldbutton = button;
 848                         ox = x;
 849                         oy = y;
 850                 } else if(e->xbutton.type == ButtonRelease) {
 851                         oldbutton = 3;
 852                         /* MODE_MOUSEX10: no button release reporting */
 853                         if(IS_SET(MODE_MOUSEX10))
 854                                 return;
 855                         if (button == 64 || button == 65)
 856                                 return;
 857                 }
 858         }
 859
 860         if(!IS_SET(MODE_MOUSEX10)) {
 861                 button += (state & ShiftMask   ? 4  : 0)
 862                         + (state & Mod4Mask    ? 8  : 0)
 863                         + (state & ControlMask ? 16 : 0);
 864         }
 865
 866         len = 0;
 867         if(IS_SET(MODE_MOUSESGR)) {
 868                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 869                                 button, x+1, y+1,
 870                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 871         } else if(x < 223 && y < 223) {
 872                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 873                                 32+button, 32+x+1, 32+y+1);
 874         } else {
 875                 return;
 876         }
 877
 878         ttywrite(buf, len);
 879 }
 880
 881 void
 882 bpress(XEvent *e) {
 883         struct timespec now;
 884         Mousekey *mk;
 885
 886         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 887                 mousereport(e);
 888                 return;
 889         }
 890
 891         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 892                 if(e->xbutton.button == mk->b
 893                                 && match(mk->mask, e->xbutton.state)) {
 894                         ttysend(mk->s, strlen(mk->s));
 895                         return;
 896                 }
 897         }
 898
 899         if(e->xbutton.button == Button1) {
 900                 clock_gettime(CLOCK_MONOTONIC, &now);
 901
 902                 /* Clear previous selection, logically and visually. */
 903                 selclear(NULL);
 904                 sel.mode = 1;
 905                 sel.type = SEL_REGULAR;
 906                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 907                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 908
 909                 /*
 910                  * If the user clicks below predefined timeouts specific
 911                  * snapping behaviour is exposed.
 912                  */
 913                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 914                         sel.snap = SNAP_LINE;
 915                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 916                         sel.snap = SNAP_WORD;
 917                 } else {
 918                         sel.snap = 0;
 919                 }
 920                 selnormalize();
 921
 922                 /*
 923                  * Draw selection, unless it's regular and we don't want to
 924                  * make clicks visible
 925                  */
 926                 if(sel.snap != 0) {
 927                         sel.mode++;
 928                         tsetdirt(sel.nb.y, sel.ne.y);
 929                 }
 930                 sel.tclick2 = sel.tclick1;
 931                 sel.tclick1 = now;
 932         }
 933 }
 934
 935 char *
 936 getsel(void) {
 937         char *str, *ptr;
 938         int y, bufsize, size, lastx, linelen;
 939         Glyph *gp, *last;
 940
 941         if(sel.ob.x == -1)
 942                 return NULL;
 943
 944         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 945         ptr = str = xmalloc(bufsize);
 946
 947         /* append every set & selected glyph to the selection */
 948         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 949                 linelen = tlinelen(y);
 950
 951                 if(sel.type == SEL_RECTANGULAR) {
 952                         gp = &term.line[y][sel.nb.x];
 953                         lastx = sel.ne.x;
 954                 } else {
 955                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 956                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 957                 }
 958                 last = &term.line[y][MIN(lastx, linelen-1)];
 959                 while(last >= gp && last->c[0] == ' ')
 960                         --last;
 961
 962                 for( ; gp <= last; ++gp) {
 963                         if(gp->mode & ATTR_WDUMMY)
 964                                 continue;
 965
 966                         size = utf8len(gp->c);
 967                         memcpy(ptr, gp->c, size);
 968                         ptr += size;
 969                 }
 970
 971                 /*
 972                  * Copy and pasting of line endings is inconsistent
 973                  * in the inconsistent terminal and GUI world.
 974                  * The best solution seems like to produce '\n' when
 975                  * something is copied from st and convert '\n' to
 976                  * '\r', when something to be pasted is received by
 977                  * st.
 978                  * FIXME: Fix the computer world.
 979                  */
 980                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 981                         *ptr++ = '\n';
 982         }
 983         *ptr = 0;
 984         return str;
 985 }
 986
 987 void
 988 selcopy(void) {
 989         xsetsel(getsel());
 990 }
 991
 992 void
 993 selnotify(XEvent *e) {
 994         ulong nitems, ofs, rem;
 995         int format;
 996         uchar *data, *last, *repl;
 997         Atom type;
 998         XSelectionEvent *xsev;
 999
1000         ofs = 0;
1001         xsev = (XSelectionEvent *)e;
1002         if (xsev->property == None)
1003             return;
1004         do {
1005                 if(XGetWindowProperty(xw.dpy, xw.win, xsev->property, ofs,
1006                                         BUFSIZ/4, False, AnyPropertyType,
1007                                         &type, &format, &nitems, &rem,
1008                                         &data)) {
1009                         fprintf(stderr, "Clipboard allocation failed\n");
1010                         return;
1011                 }
1012
1013                 /*
1014                  * As seen in getsel:
1015                  * Line endings are inconsistent in the terminal and GUI world
1016                  * copy and pasting. When receiving some selection data,
1017                  * replace all '\n' with '\r'.
1018                  * FIXME: Fix the computer world.
1019                  */
1020                 repl = data;
1021                 last = data + nitems * format / 8;
1022                 while((repl = memchr(repl, '\n', last - repl))) {
1023                         *repl++ = '\r';
1024                 }
1025
1026                 if(IS_SET(MODE_BRCKTPASTE))
1027                         ttywrite("\033[200~", 6);
1028                 ttysend((char *)data, nitems * format / 8);
1029                 if(IS_SET(MODE_BRCKTPASTE))
1030                         ttywrite("\033[201~", 6);
1031                 XFree(data);
1032                 /* number of 32-bit chunks returned */
1033                 ofs += nitems * format / 32;
1034         } while(rem > 0);
1035 }
1036
1037 void
1038 selpaste(const Arg *dummy) {
1039         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1040                         xw.win, CurrentTime);
1041 }
1042
1043 void
1044 clipcopy(const Arg *dummy) {
1045         Atom clipboard;
1046
1047         if(sel.clipboard != NULL)
1048                 free(sel.clipboard);
1049
1050         if(sel.primary != NULL) {
1051                 sel.clipboard = xstrdup(sel.primary);
1052                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1053                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1054         }
1055 }
1056
1057 void
1058 clippaste(const Arg *dummy) {
1059         Atom clipboard;
1060
1061         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1062         XConvertSelection(xw.dpy, clipboard, sel.xtarget, clipboard,
1063                         xw.win, CurrentTime);
1064 }
1065
1066 void
1067 selclear(XEvent *e) {
1068         if(sel.ob.x == -1)
1069                 return;
1070         sel.ob.x = -1;
1071         tsetdirt(sel.nb.y, sel.ne.y);
1072 }
1073
1074 void
1075 selrequest(XEvent *e) {
1076         XSelectionRequestEvent *xsre;
1077         XSelectionEvent xev;
1078         Atom xa_targets, string, clipboard;
1079         char *seltext;
1080
1081         xsre = (XSelectionRequestEvent *) e;
1082         xev.type = SelectionNotify;
1083         xev.requestor = xsre->requestor;
1084         xev.selection = xsre->selection;
1085         xev.target = xsre->target;
1086         xev.time = xsre->time;
1087         /* reject */
1088         xev.property = None;
1089
1090         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1091         if(xsre->target == xa_targets) {
1092                 /* respond with the supported type */
1093                 string = sel.xtarget;
1094                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1095                                 XA_ATOM, 32, PropModeReplace,
1096                                 (uchar *) &string, 1);
1097                 xev.property = xsre->property;
1098         } else if(xsre->target == sel.xtarget || xsre->target == XA_STRING) {
1099                 /*
1100                  * xith XA_STRING non ascii characters may be incorrect in the
1101                  * requestor. It is not our problem, use utf8.
1102                  */
1103                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1104                 if(xsre->selection == XA_PRIMARY) {
1105                         seltext = sel.primary;
1106                 } else if(xsre->selection == clipboard) {
1107                         seltext = sel.clipboard;
1108                 } else {
1109                         fprintf(stderr,
1110                                 "Unhandled clipboard selection 0x%lx\n",
1111                                 xsre->selection);
1112                         return;
1113                 }
1114                 if(seltext != NULL) {
1115                         XChangeProperty(xsre->display, xsre->requestor,
1116                                         xsre->property, xsre->target,
1117                                         8, PropModeReplace,
1118                                         (uchar *)seltext, strlen(seltext));
1119                         xev.property = xsre->property;
1120                 }
1121         }
1122
1123         /* all done, send a notification to the listener */
1124         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1125                 fprintf(stderr, "Error sending SelectionNotify event\n");
1126 }
1127
1128 void
1129 xsetsel(char *str) {
1130         free(sel.primary);
1131         sel.primary = str;
1132
1133         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1134 }
1135
1136 void
1137 brelease(XEvent *e) {
1138         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1139                 mousereport(e);
1140                 return;
1141         }
1142
1143         if(e->xbutton.button == Button2) {
1144                 selpaste(NULL);
1145         } else if(e->xbutton.button == Button1) {
1146                 if(sel.mode < 2) {
1147                         selclear(NULL);
1148                 } else {
1149                         getbuttoninfo(e);
1150                         selcopy();
1151                 }
1152                 sel.mode = 0;
1153                 tsetdirt(sel.nb.y, sel.ne.y);
1154         }
1155 }
1156
1157 void
1158 bmotion(XEvent *e) {
1159         int oldey, oldex, oldsby, oldsey;
1160
1161         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1162                 mousereport(e);
1163                 return;
1164         }
1165
1166         if(!sel.mode)
1167                 return;
1168
1169         sel.mode++;
1170         oldey = sel.oe.y;
1171         oldex = sel.oe.x;
1172         oldsby = sel.nb.y;
1173         oldsey = sel.ne.y;
1174         getbuttoninfo(e);
1175
1176         if(oldey != sel.oe.y || oldex != sel.oe.x)
1177                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1178 }
1179
1180 void
1181 die(const char *errstr, ...) {
1182         va_list ap;
1183
1184         va_start(ap, errstr);
1185         vfprintf(stderr, errstr, ap);
1186         va_end(ap);
1187         exit(EXIT_FAILURE);
1188 }
1189
1190 void
1191 execsh(void) {
1192         char **args, *sh, *prog;
1193         const struct passwd *pw;
1194         char buf[sizeof(long) * 8 + 1];
1195
1196         errno = 0;
1197         if((pw = getpwuid(getuid())) == NULL) {
1198                 if(errno)
1199                         die("getpwuid:%s\n", strerror(errno));
1200                 else
1201                         die("who are you?\n");
1202         }
1203
1204         if (!(sh = getenv("SHELL"))) {
1205                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1206         }
1207
1208         if(opt_cmd)
1209                 prog = opt_cmd[0];
1210         else if(utmp)
1211                 prog = utmp;
1212         else
1213                 prog = sh;
1214         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1215
1216         snprintf(buf, sizeof(buf), "%lu", xw.win);
1217
1218         unsetenv("COLUMNS");
1219         unsetenv("LINES");
1220         unsetenv("TERMCAP");
1221         setenv("LOGNAME", pw->pw_name, 1);
1222         setenv("USER", pw->pw_name, 1);
1223         setenv("SHELL", sh, 1);
1224         setenv("HOME", pw->pw_dir, 1);
1225         setenv("TERM", termname, 1);
1226         setenv("WINDOWID", buf, 1);
1227
1228         signal(SIGCHLD, SIG_DFL);
1229         signal(SIGHUP, SIG_DFL);
1230         signal(SIGINT, SIG_DFL);
1231         signal(SIGQUIT, SIG_DFL);
1232         signal(SIGTERM, SIG_DFL);
1233         signal(SIGALRM, SIG_DFL);
1234
1235         execvp(prog, args);
1236         _exit(EXIT_FAILURE);
1237 }
1238
1239 void
1240 sigchld(int a) {
1241         int stat, ret;
1242
1243         if(waitpid(pid, &stat, 0) < 0)
1244                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1245
1246         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1247         if (ret != EXIT_SUCCESS)
1248                 die("child finished with error '%d'\n", stat);
1249         exit(EXIT_SUCCESS);
1250 }
1251
1252 void
1253 ttynew(void) {
1254         int m, s;
1255         struct winsize w = {term.row, term.col, 0, 0};
1256
1257         /* seems to work fine on linux, openbsd and freebsd */
1258         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1259                 die("openpty failed: %s\n", strerror(errno));
1260
1261         switch(pid = fork()) {
1262         case -1:
1263                 die("fork failed\n");
1264                 break;
1265         case 0:
1266                 setsid(); /* create a new process group */
1267                 dup2(s, STDIN_FILENO);
1268                 dup2(s, STDOUT_FILENO);
1269                 dup2(s, STDERR_FILENO);
1270                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1271                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1272                 close(s);
1273                 close(m);
1274                 execsh();
1275                 break;
1276         default:
1277                 close(s);
1278                 cmdfd = m;
1279                 signal(SIGCHLD, sigchld);
1280                 if(opt_io) {
1281                         term.mode |= MODE_PRINT;
1282                         iofd = (!strcmp(opt_io, "-")) ?
1283                                   STDOUT_FILENO :
1284                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1285                         if(iofd < 0) {
1286                                 fprintf(stderr, "Error opening %s:%s\n",
1287                                         opt_io, strerror(errno));
1288                         }
1289                 }
1290                 break;
1291         }
1292 }
1293
1294 void
1295 ttyread(void) {
1296         static char buf[BUFSIZ];
1297         static int buflen = 0;
1298         char *ptr;
1299         char s[UTF_SIZ];
1300         int charsize; /* size of utf8 char in bytes */
1301         long unicodep;
1302         int ret;
1303
1304         /* append read bytes to unprocessed bytes */
1305         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1306                 die("Couldn't read from shell: %s\n", strerror(errno));
1307
1308         /* process every complete utf8 char */
1309         buflen += ret;
1310         ptr = buf;
1311         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1312                 utf8encode(unicodep, s, UTF_SIZ);
1313                 tputc(s, charsize);
1314                 ptr += charsize;
1315                 buflen -= charsize;
1316         }
1317
1318         /* keep any uncomplete utf8 char for the next call */
1319         memmove(buf, ptr, buflen);
1320 }
1321
1322 void
1323 ttywrite(const char *s, size_t n) {
1324         if(xwrite(cmdfd, s, n) == -1)
1325                 die("write error on tty: %s\n", strerror(errno));
1326 }
1327
1328 void
1329 ttysend(char *s, size_t n) {
1330         ttywrite(s, n);
1331         if(IS_SET(MODE_ECHO))
1332                 techo(s, n);
1333 }
1334
1335 void
1336 ttyresize(void) {
1337         struct winsize w;
1338
1339         w.ws_row = term.row;
1340         w.ws_col = term.col;
1341         w.ws_xpixel = xw.tw;
1342         w.ws_ypixel = xw.th;
1343         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1344                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1345 }
1346
1347 int
1348 tattrset(int attr) {
1349         int i, j;
1350
1351         for(i = 0; i < term.row-1; i++) {
1352                 for(j = 0; j < term.col-1; j++) {
1353                         if(term.line[i][j].mode & attr)
1354                                 return 1;
1355                 }
1356         }
1357
1358         return 0;
1359 }
1360
1361 void
1362 tsetdirt(int top, int bot) {
1363         int i;
1364
1365         LIMIT(top, 0, term.row-1);
1366         LIMIT(bot, 0, term.row-1);
1367
1368         for(i = top; i <= bot; i++)
1369                 term.dirty[i] = 1;
1370 }
1371
1372 void
1373 tsetdirtattr(int attr) {
1374         int i, j;
1375
1376         for(i = 0; i < term.row-1; i++) {
1377                 for(j = 0; j < term.col-1; j++) {
1378                         if(term.line[i][j].mode & attr) {
1379                                 tsetdirt(i, i);
1380                                 break;
1381                         }
1382                 }
1383         }
1384 }
1385
1386 void
1387 tfulldirt(void) {
1388         tsetdirt(0, term.row-1);
1389 }
1390
1391 void
1392 tcursor(int mode) {
1393         static TCursor c[2];
1394         bool alt = IS_SET(MODE_ALTSCREEN);
1395
1396         if(mode == CURSOR_SAVE) {
1397                 c[alt] = term.c;
1398         } else if(mode == CURSOR_LOAD) {
1399                 term.c = c[alt];
1400                 tmoveto(c[alt].x, c[alt].y);
1401         }
1402 }
1403
1404 void
1405 treset(void) {
1406         uint i;
1407
1408         term.c = (TCursor){{
1409                 .mode = ATTR_NULL,
1410                 .fg = defaultfg,
1411                 .bg = defaultbg
1412         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1413
1414         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1415         for(i = tabspaces; i < term.col; i += tabspaces)
1416                 term.tabs[i] = 1;
1417         term.top = 0;
1418         term.bot = term.row - 1;
1419         term.mode = MODE_WRAP;
1420         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1421         term.charset = 0;
1422
1423         for(i = 0; i < 2; i++) {
1424                 tmoveto(0, 0);
1425                 tcursor(CURSOR_SAVE);
1426                 tclearregion(0, 0, term.col-1, term.row-1);
1427                 tswapscreen();
1428         }
1429 }
1430
1431 void
1432 tnew(int col, int row) {
1433         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1434         tresize(col, row);
1435         term.numlock = 1;
1436
1437         treset();
1438 }
1439
1440 void
1441 tswapscreen(void) {
1442         Line *tmp = term.line;
1443
1444         term.line = term.alt;
1445         term.alt = tmp;
1446         term.mode ^= MODE_ALTSCREEN;
1447         tfulldirt();
1448 }
1449
1450 void
1451 tscrolldown(int orig, int n) {
1452         int i;
1453         Line temp;
1454
1455         LIMIT(n, 0, term.bot-orig+1);
1456
1457         tsetdirt(orig, term.bot-n);
1458         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1459
1460         for(i = term.bot; i >= orig+n; i--) {
1461                 temp = term.line[i];
1462                 term.line[i] = term.line[i-n];
1463                 term.line[i-n] = temp;
1464         }
1465
1466         selscroll(orig, n);
1467 }
1468
1469 void
1470 tscrollup(int orig, int n) {
1471         int i;
1472         Line temp;
1473
1474         LIMIT(n, 0, term.bot-orig+1);
1475
1476         tclearregion(0, orig, term.col-1, orig+n-1);
1477         tsetdirt(orig+n, term.bot);
1478
1479         for(i = orig; i <= term.bot-n; i++) {
1480                 temp = term.line[i];
1481                 term.line[i] = term.line[i+n];
1482                 term.line[i+n] = temp;
1483         }
1484
1485         selscroll(orig, -n);
1486 }
1487
1488 void
1489 selscroll(int orig, int n) {
1490         if(sel.ob.x == -1)
1491                 return;
1492
1493         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1494                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1495                         selclear(NULL);
1496                         return;
1497                 }
1498                 if(sel.type == SEL_RECTANGULAR) {
1499                         if(sel.ob.y < term.top)
1500                                 sel.ob.y = term.top;
1501                         if(sel.oe.y > term.bot)
1502                                 sel.oe.y = term.bot;
1503                 } else {
1504                         if(sel.ob.y < term.top) {
1505                                 sel.ob.y = term.top;
1506                                 sel.ob.x = 0;
1507                         }
1508                         if(sel.oe.y > term.bot) {
1509                                 sel.oe.y = term.bot;
1510                                 sel.oe.x = term.col;
1511                         }
1512                 }
1513                 selnormalize();
1514         }
1515 }
1516
1517 void
1518 tnewline(int first_col) {
1519         int y = term.c.y;
1520
1521         if(y == term.bot) {
1522                 tscrollup(term.top, 1);
1523         } else {
1524                 y++;
1525         }
1526         tmoveto(first_col ? 0 : term.c.x, y);
1527 }
1528
1529 void
1530 csiparse(void) {
1531         char *p = csiescseq.buf, *np;
1532         long int v;
1533
1534         csiescseq.narg = 0;
1535         if(*p == '?') {
1536                 csiescseq.priv = 1;
1537                 p++;
1538         }
1539
1540         csiescseq.buf[csiescseq.len] = '\0';
1541         while(p < csiescseq.buf+csiescseq.len) {
1542                 np = NULL;
1543                 v = strtol(p, &np, 10);
1544                 if(np == p)
1545                         v = 0;
1546                 if(v == LONG_MAX || v == LONG_MIN)
1547                         v = -1;
1548                 csiescseq.arg[csiescseq.narg++] = v;
1549                 p = np;
1550                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1551                         break;
1552                 p++;
1553         }
1554         csiescseq.mode[0] = *p++;
1555         csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1556 }
1557
1558 /* for absolute user moves, when decom is set */
1559 void
1560 tmoveato(int x, int y) {
1561         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1562 }
1563
1564 void
1565 tmoveto(int x, int y) {
1566         int miny, maxy;
1567
1568         if(term.c.state & CURSOR_ORIGIN) {
1569                 miny = term.top;
1570                 maxy = term.bot;
1571         } else {
1572                 miny = 0;
1573                 maxy = term.row - 1;
1574         }
1575         LIMIT(x, 0, term.col-1);
1576         LIMIT(y, miny, maxy);
1577         term.c.state &= ~CURSOR_WRAPNEXT;
1578         term.c.x = x;
1579         term.c.y = y;
1580 }
1581
1582 void
1583 tsetchar(char *c, Glyph *attr, int x, int y) {
1584         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1585                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1586                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1587                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1588                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1589                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1590                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1591                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1592                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1593         };
1594
1595         /*
1596          * The table is proudly stolen from rxvt.
1597          */
1598         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1599                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1600                         c = vt100_0[c[0] - 0x41];
1601                 }
1602         }
1603
1604         if(term.line[y][x].mode & ATTR_WIDE) {
1605                 if(x+1 < term.col) {
1606                         term.line[y][x+1].c[0] = ' ';
1607                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1608                 }
1609         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1610                 term.line[y][x-1].c[0] = ' ';
1611                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1612         }
1613
1614         term.dirty[y] = 1;
1615         term.line[y][x] = *attr;
1616         memcpy(term.line[y][x].c, c, UTF_SIZ);
1617 }
1618
1619 void
1620 tclearregion(int x1, int y1, int x2, int y2) {
1621         int x, y, temp;
1622         Glyph *gp;
1623
1624         if(x1 > x2)
1625                 temp = x1, x1 = x2, x2 = temp;
1626         if(y1 > y2)
1627                 temp = y1, y1 = y2, y2 = temp;
1628
1629         LIMIT(x1, 0, term.col-1);
1630         LIMIT(x2, 0, term.col-1);
1631         LIMIT(y1, 0, term.row-1);
1632         LIMIT(y2, 0, term.row-1);
1633
1634         for(y = y1; y <= y2; y++) {
1635                 term.dirty[y] = 1;
1636                 for(x = x1; x <= x2; x++) {
1637                         gp = &term.line[y][x];
1638                         if(selected(x, y))
1639                                 selclear(NULL);
1640                         gp->fg = term.c.attr.fg;
1641                         gp->bg = term.c.attr.bg;
1642                         gp->mode = 0;
1643                         memcpy(gp->c, " ", 2);
1644                 }
1645         }
1646 }
1647
1648 void
1649 tdeletechar(int n) {
1650         int dst, src, size;
1651         Glyph *line;
1652
1653         LIMIT(n, 0, term.col - term.c.x);
1654
1655         dst = term.c.x;
1656         src = term.c.x + n;
1657         size = term.col - src;
1658         line = term.line[term.c.y];
1659
1660         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1661         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1662 }
1663
1664 void
1665 tinsertblank(int n) {
1666         int dst, src, size;
1667         Glyph *line;
1668
1669         LIMIT(n, 0, term.col - term.c.x);
1670
1671         dst = term.c.x + n;
1672         src = term.c.x;
1673         size = term.col - dst;
1674         line = term.line[term.c.y];
1675
1676         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1677         tclearregion(src, term.c.y, dst - 1, term.c.y);
1678 }
1679
1680 void
1681 tinsertblankline(int n) {
1682         if(BETWEEN(term.c.y, term.top, term.bot))
1683                 tscrolldown(term.c.y, n);
1684 }
1685
1686 void
1687 tdeleteline(int n) {
1688         if(BETWEEN(term.c.y, term.top, term.bot))
1689                 tscrollup(term.c.y, n);
1690 }
1691
1692 int32_t
1693 tdefcolor(int *attr, int *npar, int l) {
1694         int32_t idx = -1;
1695         uint r, g, b;
1696
1697         switch (attr[*npar + 1]) {
1698         case 2: /* direct color in RGB space */
1699                 if (*npar + 4 >= l) {
1700                         fprintf(stderr,
1701                                 "erresc(38): Incorrect number of parameters (%d)\n",
1702                                 *npar);
1703                         break;
1704                 }
1705                 r = attr[*npar + 2];
1706                 g = attr[*npar + 3];
1707                 b = attr[*npar + 4];
1708                 *npar += 4;
1709                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1710                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1711                                 r, g, b);
1712                 else
1713                         idx = TRUECOLOR(r, g, b);
1714                 break;
1715         case 5: /* indexed color */
1716                 if (*npar + 2 >= l) {
1717                         fprintf(stderr,
1718                                 "erresc(38): Incorrect number of parameters (%d)\n",
1719                                 *npar);
1720                         break;
1721                 }
1722                 *npar += 2;
1723                 if(!BETWEEN(attr[*npar], 0, 255))
1724                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1725                 else
1726                         idx = attr[*npar];
1727                 break;
1728         case 0: /* implemented defined (only foreground) */
1729         case 1: /* transparent */
1730         case 3: /* direct color in CMY space */
1731         case 4: /* direct color in CMYK space */
1732         default:
1733                 fprintf(stderr,
1734                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1735                 break;
1736         }
1737
1738         return idx;
1739 }
1740
1741 void
1742 tsetattr(int *attr, int l) {
1743         int i;
1744         int32_t idx;
1745
1746         for(i = 0; i < l; i++) {
1747                 switch(attr[i]) {
1748                 case 0:
1749                         term.c.attr.mode &= ~(
1750                                 ATTR_BOLD       |
1751                                 ATTR_FAINT      |
1752                                 ATTR_ITALIC     |
1753                                 ATTR_UNDERLINE  |
1754                                 ATTR_BLINK      |
1755                                 ATTR_REVERSE    |
1756                                 ATTR_INVISIBLE  |
1757                                 ATTR_STRUCK     );
1758                         term.c.attr.fg = defaultfg;
1759                         term.c.attr.bg = defaultbg;
1760                         break;
1761                 case 1:
1762                         term.c.attr.mode |= ATTR_BOLD;
1763                         break;
1764                 case 2:
1765                         term.c.attr.mode |= ATTR_FAINT;
1766                         break;
1767                 case 3:
1768                         term.c.attr.mode |= ATTR_ITALIC;
1769                         break;
1770                 case 4:
1771                         term.c.attr.mode |= ATTR_UNDERLINE;
1772                         break;
1773                 case 5: /* slow blink */
1774                         /* FALLTHROUGH */
1775                 case 6: /* rapid blink */
1776                         term.c.attr.mode |= ATTR_BLINK;
1777                         break;
1778                 case 7:
1779                         term.c.attr.mode |= ATTR_REVERSE;
1780                         break;
1781                 case 8:
1782                         term.c.attr.mode |= ATTR_INVISIBLE;
1783                         break;
1784                 case 9:
1785                         term.c.attr.mode |= ATTR_STRUCK;
1786                         break;
1787                 case 22:
1788                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1789                         break;
1790                 case 23:
1791                         term.c.attr.mode &= ~ATTR_ITALIC;
1792                         break;
1793                 case 24:
1794                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1795                         break;
1796                 case 25:
1797                         term.c.attr.mode &= ~ATTR_BLINK;
1798                         break;
1799                 case 27:
1800                         term.c.attr.mode &= ~ATTR_REVERSE;
1801                         break;
1802                 case 28:
1803                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1804                         break;
1805                 case 29:
1806                         term.c.attr.mode &= ~ATTR_STRUCK;
1807                         break;
1808                 case 38:
1809                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1810                                 term.c.attr.fg = idx;
1811                         break;
1812                 case 39:
1813                         term.c.attr.fg = defaultfg;
1814                         break;
1815                 case 48:
1816                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1817                                 term.c.attr.bg = idx;
1818                         break;
1819                 case 49:
1820                         term.c.attr.bg = defaultbg;
1821                         break;
1822                 default:
1823                         if(BETWEEN(attr[i], 30, 37)) {
1824                                 term.c.attr.fg = attr[i] - 30;
1825                         } else if(BETWEEN(attr[i], 40, 47)) {
1826                                 term.c.attr.bg = attr[i] - 40;
1827                         } else if(BETWEEN(attr[i], 90, 97)) {
1828                                 term.c.attr.fg = attr[i] - 90 + 8;
1829                         } else if(BETWEEN(attr[i], 100, 107)) {
1830                                 term.c.attr.bg = attr[i] - 100 + 8;
1831                         } else {
1832                                 fprintf(stderr,
1833                                         "erresc(default): gfx attr %d unknown\n",
1834                                         attr[i]), csidump();
1835                         }
1836                         break;
1837                 }
1838         }
1839 }
1840
1841 void
1842 tsetscroll(int t, int b) {
1843         int temp;
1844
1845         LIMIT(t, 0, term.row-1);
1846         LIMIT(b, 0, term.row-1);
1847         if(t > b) {
1848                 temp = t;
1849                 t = b;
1850                 b = temp;
1851         }
1852         term.top = t;
1853         term.bot = b;
1854 }
1855
1856 void
1857 tsetmode(bool priv, bool set, int *args, int narg) {
1858         int *lim, mode;
1859         bool alt;
1860
1861         for(lim = args + narg; args < lim; ++args) {
1862                 if(priv) {
1863                         switch(*args) {
1864                         case 1: /* DECCKM -- Cursor key */
1865                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1866                                 break;
1867                         case 5: /* DECSCNM -- Reverse video */
1868                                 mode = term.mode;
1869                                 MODBIT(term.mode, set, MODE_REVERSE);
1870                                 if(mode != term.mode)
1871                                         redraw();
1872                                 break;
1873                         case 6: /* DECOM -- Origin */
1874                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1875                                 tmoveato(0, 0);
1876                                 break;
1877                         case 7: /* DECAWM -- Auto wrap */
1878                                 MODBIT(term.mode, set, MODE_WRAP);
1879                                 break;
1880                         case 0:  /* Error (IGNORED) */
1881                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1882                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1883                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1884                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1885                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1886                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1887                         case 42: /* DECNRCM -- National characters (IGNORED) */
1888                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1889                                 break;
1890                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1891                                 MODBIT(term.mode, !set, MODE_HIDE);
1892                                 break;
1893                         case 9:    /* X10 mouse compatibility mode */
1894                                 xsetpointermotion(0);
1895                                 MODBIT(term.mode, 0, MODE_MOUSE);
1896                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1897                                 break;
1898                         case 1000: /* 1000: report button press */
1899                                 xsetpointermotion(0);
1900                                 MODBIT(term.mode, 0, MODE_MOUSE);
1901                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1902                                 break;
1903                         case 1002: /* 1002: report motion on button press */
1904                                 xsetpointermotion(0);
1905                                 MODBIT(term.mode, 0, MODE_MOUSE);
1906                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1907                                 break;
1908                         case 1003: /* 1003: enable all mouse motions */
1909                                 xsetpointermotion(set);
1910                                 MODBIT(term.mode, 0, MODE_MOUSE);
1911                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1912                                 break;
1913                         case 1004: /* 1004: send focus events to tty */
1914                                 MODBIT(term.mode, set, MODE_FOCUS);
1915                                 break;
1916                         case 1006: /* 1006: extended reporting mode */
1917                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1918                                 break;
1919                         case 1034:
1920                                 MODBIT(term.mode, set, MODE_8BIT);
1921                                 break;
1922                         case 1049: /* swap screen & set/restore cursor as xterm */
1923                                 if (!allowaltscreen)
1924                                         break;
1925                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1926                                 /* FALLTHROUGH */
1927                         case 47: /* swap screen */
1928                         case 1047:
1929                                 if (!allowaltscreen)
1930                                         break;
1931                                 alt = IS_SET(MODE_ALTSCREEN);
1932                                 if(alt) {
1933                                         tclearregion(0, 0, term.col-1,
1934                                                         term.row-1);
1935                                 }
1936                                 if(set ^ alt) /* set is always 1 or 0 */
1937                                         tswapscreen();
1938                                 if(*args != 1049)
1939                                         break;
1940                                 /* FALLTHROUGH */
1941                         case 1048:
1942                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1943                                 break;
1944                         case 2004: /* 2004: bracketed paste mode */
1945                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1946                                 break;
1947                         /* Not implemented mouse modes. See comments there. */
1948                         case 1001: /* mouse highlight mode; can hang the
1949                                       terminal by design when implemented. */
1950                         case 1005: /* UTF-8 mouse mode; will confuse
1951                                       applications not supporting UTF-8
1952                                       and luit. */
1953                         case 1015: /* urxvt mangled mouse mode; incompatible
1954                                       and can be mistaken for other control
1955                                       codes. */
1956                         default:
1957                                 fprintf(stderr,
1958                                         "erresc: unknown private set/reset mode %d\n",
1959                                         *args);
1960                                 break;
1961                         }
1962                 } else {
1963                         switch(*args) {
1964                         case 0:  /* Error (IGNORED) */
1965                                 break;
1966                         case 2:  /* KAM -- keyboard action */
1967                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1968                                 break;
1969                         case 4:  /* IRM -- Insertion-replacement */
1970                                 MODBIT(term.mode, set, MODE_INSERT);
1971                                 break;
1972                         case 12: /* SRM -- Send/Receive */
1973                                 MODBIT(term.mode, !set, MODE_ECHO);
1974                                 break;
1975                         case 20: /* LNM -- Linefeed/new line */
1976                                 MODBIT(term.mode, set, MODE_CRLF);
1977                                 break;
1978                         default:
1979                                 fprintf(stderr,
1980                                         "erresc: unknown set/reset mode %d\n",
1981                                         *args);
1982                                 break;
1983                         }
1984                 }
1985         }
1986 }
1987
1988 void
1989 csihandle(void) {
1990         char buf[40];
1991         int len;
1992
1993         switch(csiescseq.mode[0]) {
1994         default:
1995         unknown:
1996                 fprintf(stderr, "erresc: unknown csi ");
1997                 csidump();
1998                 /* die(""); */
1999                 break;
2000         case '@': /* ICH -- Insert <n> blank char */
2001                 DEFAULT(csiescseq.arg[0], 1);
2002                 tinsertblank(csiescseq.arg[0]);
2003                 break;
2004         case 'A': /* CUU -- Cursor <n> Up */
2005                 DEFAULT(csiescseq.arg[0], 1);
2006                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
2007                 break;
2008         case 'B': /* CUD -- Cursor <n> Down */
2009         case 'e': /* VPR --Cursor <n> Down */
2010                 DEFAULT(csiescseq.arg[0], 1);
2011                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
2012                 break;
2013         case 'i': /* MC -- Media Copy */
2014                 switch(csiescseq.arg[0]) {
2015                 case 0:
2016                         tdump();
2017                         break;
2018                 case 1:
2019                         tdumpline(term.c.y);
2020                         break;
2021                 case 2:
2022                         tdumpsel();
2023                         break;
2024                 case 4:
2025                         term.mode &= ~MODE_PRINT;
2026                         break;
2027                 case 5:
2028                         term.mode |= MODE_PRINT;
2029                         break;
2030                 }
2031                 break;
2032         case 'c': /* DA -- Device Attributes */
2033                 if(csiescseq.arg[0] == 0)
2034                         ttywrite(vtiden, sizeof(vtiden) - 1);
2035                 break;
2036         case 'C': /* CUF -- Cursor <n> Forward */
2037         case 'a': /* HPR -- Cursor <n> Forward */
2038                 DEFAULT(csiescseq.arg[0], 1);
2039                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
2040                 break;
2041         case 'D': /* CUB -- Cursor <n> Backward */
2042                 DEFAULT(csiescseq.arg[0], 1);
2043                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2044                 break;
2045         case 'E': /* CNL -- Cursor <n> Down and first col */
2046                 DEFAULT(csiescseq.arg[0], 1);
2047                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2048                 break;
2049         case 'F': /* CPL -- Cursor <n> Up and first col */
2050                 DEFAULT(csiescseq.arg[0], 1);
2051                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2052                 break;
2053         case 'g': /* TBC -- Tabulation clear */
2054                 switch(csiescseq.arg[0]) {
2055                 case 0: /* clear current tab stop */
2056                         term.tabs[term.c.x] = 0;
2057                         break;
2058                 case 3: /* clear all the tabs */
2059                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2060                         break;
2061                 default:
2062                         goto unknown;
2063                 }
2064                 break;
2065         case 'G': /* CHA -- Move to <col> */
2066         case '`': /* HPA */
2067                 DEFAULT(csiescseq.arg[0], 1);
2068                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2069                 break;
2070         case 'H': /* CUP -- Move to <row> <col> */
2071         case 'f': /* HVP */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 DEFAULT(csiescseq.arg[1], 1);
2074                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2075                 break;
2076         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2077                 DEFAULT(csiescseq.arg[0], 1);
2078                 tputtab(csiescseq.arg[0]);
2079                 break;
2080         case 'J': /* ED -- Clear screen */
2081                 selclear(NULL);
2082                 switch(csiescseq.arg[0]) {
2083                 case 0: /* below */
2084                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2085                         if(term.c.y < term.row-1) {
2086                                 tclearregion(0, term.c.y+1, term.col-1,
2087                                                 term.row-1);
2088                         }
2089                         break;
2090                 case 1: /* above */
2091                         if(term.c.y > 1)
2092                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2093                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2094                         break;
2095                 case 2: /* all */
2096                         tclearregion(0, 0, term.col-1, term.row-1);
2097                         break;
2098                 default:
2099                         goto unknown;
2100                 }
2101                 break;
2102         case 'K': /* EL -- Clear line */
2103                 switch(csiescseq.arg[0]) {
2104                 case 0: /* right */
2105                         tclearregion(term.c.x, term.c.y, term.col-1,
2106                                         term.c.y);
2107                         break;
2108                 case 1: /* left */
2109                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2110                         break;
2111                 case 2: /* all */
2112                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2113                         break;
2114                 }
2115                 break;
2116         case 'S': /* SU -- Scroll <n> line up */
2117                 DEFAULT(csiescseq.arg[0], 1);
2118                 tscrollup(term.top, csiescseq.arg[0]);
2119                 break;
2120         case 'T': /* SD -- Scroll <n> line down */
2121                 DEFAULT(csiescseq.arg[0], 1);
2122                 tscrolldown(term.top, csiescseq.arg[0]);
2123                 break;
2124         case 'L': /* IL -- Insert <n> blank lines */
2125                 DEFAULT(csiescseq.arg[0], 1);
2126                 tinsertblankline(csiescseq.arg[0]);
2127                 break;
2128         case 'l': /* RM -- Reset Mode */
2129                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2130                 break;
2131         case 'M': /* DL -- Delete <n> lines */
2132                 DEFAULT(csiescseq.arg[0], 1);
2133                 tdeleteline(csiescseq.arg[0]);
2134                 break;
2135         case 'X': /* ECH -- Erase <n> char */
2136                 DEFAULT(csiescseq.arg[0], 1);
2137                 tclearregion(term.c.x, term.c.y,
2138                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2139                 break;
2140         case 'P': /* DCH -- Delete <n> char */
2141                 DEFAULT(csiescseq.arg[0], 1);
2142                 tdeletechar(csiescseq.arg[0]);
2143                 break;
2144         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2145                 DEFAULT(csiescseq.arg[0], 1);
2146                 tputtab(-csiescseq.arg[0]);
2147                 break;
2148         case 'd': /* VPA -- Move to <row> */
2149                 DEFAULT(csiescseq.arg[0], 1);
2150                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2151                 break;
2152         case 'h': /* SM -- Set terminal mode */
2153                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2154                 break;
2155         case 'm': /* SGR -- Terminal attribute (color) */
2156                 tsetattr(csiescseq.arg, csiescseq.narg);
2157                 break;
2158         case 'n': /* DSR – Device Status Report (cursor position) */
2159                 if (csiescseq.arg[0] == 6) {
2160                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2161                                         term.c.y+1, term.c.x+1);
2162                         ttywrite(buf, len);
2163                 }
2164                 break;
2165         case 'r': /* DECSTBM -- Set Scrolling Region */
2166                 if(csiescseq.priv) {
2167                         goto unknown;
2168                 } else {
2169                         DEFAULT(csiescseq.arg[0], 1);
2170                         DEFAULT(csiescseq.arg[1], term.row);
2171                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2172                         tmoveato(0, 0);
2173                 }
2174                 break;
2175         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2176                 tcursor(CURSOR_SAVE);
2177                 break;
2178         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2179                 tcursor(CURSOR_LOAD);
2180                 break;
2181         case ' ':
2182                 switch (csiescseq.mode[1]) {
2183                         case 'q': /* DECSCUSR -- Set Cursor Style */
2184                                 DEFAULT(csiescseq.arg[0], 1);
2185                                 if (!BETWEEN(csiescseq.arg[0], 0, 6)) {
2186                                         goto unknown;
2187                                 }
2188                                 xw.cursor = csiescseq.arg[0];
2189                                 break;
2190                         default:
2191                                 goto unknown;
2192                 }
2193                 break;
2194         }
2195 }
2196
2197 void
2198 csidump(void) {
2199         int i;
2200         uint c;
2201
2202         printf("ESC[");
2203         for(i = 0; i < csiescseq.len; i++) {
2204                 c = csiescseq.buf[i] & 0xff;
2205                 if(isprint(c)) {
2206                         putchar(c);
2207                 } else if(c == '\n') {
2208                         printf("(\\n)");
2209                 } else if(c == '\r') {
2210                         printf("(\\r)");
2211                 } else if(c == 0x1b) {
2212                         printf("(\\e)");
2213                 } else {
2214                         printf("(%02x)", c);
2215                 }
2216         }
2217         putchar('\n');
2218 }
2219
2220 void
2221 csireset(void) {
2222         memset(&csiescseq, 0, sizeof(csiescseq));
2223 }
2224
2225 void
2226 strhandle(void) {
2227         char *p = NULL;
2228         int j, narg, par;
2229
2230         term.esc &= ~(ESC_STR_END|ESC_STR);
2231         strparse();
2232         narg = strescseq.narg;
2233         par = atoi(strescseq.args[0]);
2234
2235         switch(strescseq.type) {
2236         case ']': /* OSC -- Operating System Command */
2237                 switch(par) {
2238                 case 0:
2239                 case 1:
2240                 case 2:
2241                         if(narg > 1)
2242                                 xsettitle(strescseq.args[1]);
2243                         return;
2244                 case 4: /* color set */
2245                         if(narg < 3)
2246                                 break;
2247                         p = strescseq.args[2];
2248                         /* FALLTHROUGH */
2249                 case 104: /* color reset, here p = NULL */
2250                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2251                         if(xsetcolorname(j, p)) {
2252                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2253                         } else {
2254                                 /*
2255                                  * TODO if defaultbg color is changed, borders
2256                                  * are dirty
2257                                  */
2258                                 redraw();
2259                         }
2260                         return;
2261                 }
2262                 break;
2263         case 'k': /* old title set compatibility */
2264                 xsettitle(strescseq.args[0]);
2265                 return;
2266         case 'P': /* DCS -- Device Control String */
2267         case '_': /* APC -- Application Program Command */
2268         case '^': /* PM -- Privacy Message */
2269                 return;
2270         }
2271
2272         fprintf(stderr, "erresc: unknown str ");
2273         strdump();
2274 }
2275
2276 void
2277 strparse(void) {
2278         int c;
2279         char *p = strescseq.buf;
2280
2281         strescseq.narg = 0;
2282         strescseq.buf[strescseq.len] = '\0';
2283
2284         if(*p == '\0')
2285                 return;
2286
2287         while(strescseq.narg < STR_ARG_SIZ) {
2288                 strescseq.args[strescseq.narg++] = p;
2289                 while((c = *p) != ';' && c != '\0')
2290                         ++p;
2291                 if(c == '\0')
2292                         return;
2293                 *p++ = '\0';
2294         }
2295 }
2296
2297 void
2298 strdump(void) {
2299         int i;
2300         uint c;
2301
2302         printf("ESC%c", strescseq.type);
2303         for(i = 0; i < strescseq.len; i++) {
2304                 c = strescseq.buf[i] & 0xff;
2305                 if(c == '\0') {
2306                         return;
2307                 } else if(isprint(c)) {
2308                         putchar(c);
2309                 } else if(c == '\n') {
2310                         printf("(\\n)");
2311                 } else if(c == '\r') {
2312                         printf("(\\r)");
2313                 } else if(c == 0x1b) {
2314                         printf("(\\e)");
2315                 } else {
2316                         printf("(%02x)", c);
2317                 }
2318         }
2319         printf("ESC\\\n");
2320 }
2321
2322 void
2323 strreset(void) {
2324         memset(&strescseq, 0, sizeof(strescseq));
2325 }
2326
2327 void
2328 tprinter(char *s, size_t len) {
2329         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2330                 fprintf(stderr, "Error writing in %s:%s\n",
2331                         opt_io, strerror(errno));
2332                 close(iofd);
2333                 iofd = -1;
2334         }
2335 }
2336
2337 void
2338 toggleprinter(const Arg *arg) {
2339         term.mode ^= MODE_PRINT;
2340 }
2341
2342 void
2343 printscreen(const Arg *arg) {
2344         tdump();
2345 }
2346
2347 void
2348 printsel(const Arg *arg) {
2349         tdumpsel();
2350 }
2351
2352 void
2353 tdumpsel(void) {
2354         char *ptr;
2355
2356         if((ptr = getsel())) {
2357                 tprinter(ptr, strlen(ptr));
2358                 free(ptr);
2359         }
2360 }
2361
2362 void
2363 tdumpline(int n) {
2364         Glyph *bp, *end;
2365
2366         bp = &term.line[n][0];
2367         end = &bp[MIN(tlinelen(n), term.col) - 1];
2368         if(bp != end || bp->c[0] != ' ') {
2369                 for( ;bp <= end; ++bp)
2370                         tprinter(bp->c, utf8len(bp->c));
2371         }
2372         tprinter("\n", 1);
2373 }
2374
2375 void
2376 tdump(void) {
2377         int i;
2378
2379         for(i = 0; i < term.row; ++i)
2380                 tdumpline(i);
2381 }
2382
2383 void
2384 tputtab(int n) {
2385         uint x = term.c.x;
2386
2387         if(n > 0) {
2388                 while(x < term.col && n--)
2389                         for(++x; x < term.col && !term.tabs[x]; ++x)
2390                                 /* nothing */ ;
2391         } else if(n < 0) {
2392                 while(x > 0 && n++)
2393                         for(--x; x > 0 && !term.tabs[x]; --x)
2394                                 /* nothing */ ;
2395         }
2396         tmoveto(x, term.c.y);
2397 }
2398
2399 void
2400 techo(char *buf, int len) {
2401         for(; len > 0; buf++, len--) {
2402                 char c = *buf;
2403
2404                 if(ISCONTROL((uchar) c)) { /* control code */
2405                         if(c & 0x80) {
2406                                 c &= 0x7f;
2407                                 tputc("^", 1);
2408                                 tputc("[", 1);
2409                         } else if(c != '\n' && c != '\r' && c != '\t') {
2410                                 c ^= 0x40;
2411                                 tputc("^", 1);
2412                         }
2413                         tputc(&c, 1);
2414                 } else {
2415                         break;
2416                 }
2417         }
2418         if(len)
2419                 tputc(buf, len);
2420 }
2421
2422 void
2423 tdeftran(char ascii) {
2424         static char cs[] = "0B";
2425         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2426         char *p;
2427
2428         if((p = strchr(cs, ascii)) == NULL) {
2429                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2430         } else {
2431                 term.trantbl[term.icharset] = vcs[p - cs];
2432         }
2433 }
2434
2435 void
2436 tdectest(char c) {
2437         static char E[UTF_SIZ] = "E";
2438         int x, y;
2439
2440         if(c == '8') { /* DEC screen alignment test. */
2441                 for(x = 0; x < term.col; ++x) {
2442                         for(y = 0; y < term.row; ++y)
2443                                 tsetchar(E, &term.c.attr, x, y);
2444                 }
2445         }
2446 }
2447
2448 void
2449 tstrsequence(uchar c) {
2450         if (c & 0x80) {
2451                 switch (c) {
2452                 case 0x90:   /* DCS -- Device Control String */
2453                         c = 'P';
2454                         break;
2455                 case 0x9f:   /* APC -- Application Program Command */
2456                         c = '_';
2457                         break;
2458                 case 0x9e:   /* PM -- Privacy Message */
2459                         c = '^';
2460                         break;
2461                 case 0x9d:   /* OSC -- Operating System Command */
2462                         c = ']';
2463                         break;
2464                 }
2465         }
2466         strreset();
2467         strescseq.type = c;
2468         term.esc |= ESC_STR;
2469         return;
2470 }
2471
2472 void
2473 tcontrolcode(uchar ascii) {
2474         static char question[UTF_SIZ] = "?";
2475
2476         switch(ascii) {
2477         case '\t':   /* HT */
2478                 tputtab(1);
2479                 return;
2480         case '\b':   /* BS */
2481                 tmoveto(term.c.x-1, term.c.y);
2482                 return;
2483         case '\r':   /* CR */
2484                 tmoveto(0, term.c.y);
2485                 return;
2486         case '\f':   /* LF */
2487         case '\v':   /* VT */
2488         case '\n':   /* LF */
2489                 /* go to first col if the mode is set */
2490                 tnewline(IS_SET(MODE_CRLF));
2491                 return;
2492         case '\a':   /* BEL */
2493                 if(term.esc & ESC_STR_END) {
2494                         /* backwards compatibility to xterm */
2495                         strhandle();
2496                 } else {
2497                         if(!(xw.state & WIN_FOCUSED))
2498                                 xseturgency(1);
2499                         if (bellvolume)
2500                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2501                 }
2502                 break;
2503         case '\033': /* ESC */
2504                 csireset();
2505                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2506                 term.esc |= ESC_START;
2507                 return;
2508         case '\016': /* SO (LS1 -- Locking shift 1) */
2509         case '\017': /* SI (LS0 -- Locking shift 0) */
2510                 term.charset = 1 - (ascii - '\016');
2511                 return;
2512         case '\032': /* SUB */
2513                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2514         case '\030': /* CAN */
2515                 csireset();
2516                 break;
2517         case '\005': /* ENQ (IGNORED) */
2518         case '\000': /* NUL (IGNORED) */
2519         case '\021': /* XON (IGNORED) */
2520         case '\023': /* XOFF (IGNORED) */
2521         case 0177:   /* DEL (IGNORED) */
2522                 return;
2523         case 0x84:   /* TODO: IND */
2524                 break;
2525         case 0x85:   /* NEL -- Next line */
2526                 tnewline(1); /* always go to first col */
2527                 break;
2528         case 0x88:   /* HTS -- Horizontal tab stop */
2529                 term.tabs[term.c.x] = 1;
2530                 break;
2531         case 0x8d:   /* TODO: RI */
2532         case 0x8e:   /* TODO: SS2 */
2533         case 0x8f:   /* TODO: SS3 */
2534         case 0x98:   /* TODO: SOS */
2535                 break;
2536         case 0x9a:   /* DECID -- Identify Terminal */
2537                 ttywrite(vtiden, sizeof(vtiden) - 1);
2538                 break;
2539         case 0x9b:   /* TODO: CSI */
2540         case 0x9c:   /* TODO: ST */
2541                 break;
2542         case 0x90:   /* DCS -- Device Control String */
2543         case 0x9f:   /* APC -- Application Program Command */
2544         case 0x9e:   /* PM -- Privacy Message */
2545         case 0x9d:   /* OSC -- Operating System Command */
2546                 tstrsequence(ascii);
2547                 return;
2548         }
2549         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2550         term.esc &= ~(ESC_STR_END|ESC_STR);
2551         return;
2552 }
2553
2554 /*
2555  * returns 1 when the sequence is finished and it hasn't to read
2556  * more characters for this sequence, otherwise 0
2557  */
2558 int
2559 eschandle(uchar ascii) {
2560         switch(ascii) {
2561         case '[':
2562                 term.esc |= ESC_CSI;
2563                 return 0;
2564         case '#':
2565                 term.esc |= ESC_TEST;
2566                 return 0;
2567         case 'P': /* DCS -- Device Control String */
2568         case '_': /* APC -- Application Program Command */
2569         case '^': /* PM -- Privacy Message */
2570         case ']': /* OSC -- Operating System Command */
2571         case 'k': /* old title set compatibility */
2572                 tstrsequence(ascii);
2573                 return 0;
2574         case 'n': /* LS2 -- Locking shift 2 */
2575         case 'o': /* LS3 -- Locking shift 3 */
2576                 term.charset = 2 + (ascii - 'n');
2577                 break;
2578         case '(': /* GZD4 -- set primary charset G0 */
2579         case ')': /* G1D4 -- set secondary charset G1 */
2580         case '*': /* G2D4 -- set tertiary charset G2 */
2581         case '+': /* G3D4 -- set quaternary charset G3 */
2582                 term.icharset = ascii - '(';
2583                 term.esc |= ESC_ALTCHARSET;
2584                 return 0;
2585         case 'D': /* IND -- Linefeed */
2586                 if(term.c.y == term.bot) {
2587                         tscrollup(term.top, 1);
2588                 } else {
2589                         tmoveto(term.c.x, term.c.y+1);
2590                 }
2591                 break;
2592         case 'E': /* NEL -- Next line */
2593                 tnewline(1); /* always go to first col */
2594                 break;
2595         case 'H': /* HTS -- Horizontal tab stop */
2596                 term.tabs[term.c.x] = 1;
2597                 break;
2598         case 'M': /* RI -- Reverse index */
2599                 if(term.c.y == term.top) {
2600                         tscrolldown(term.top, 1);
2601                 } else {
2602                         tmoveto(term.c.x, term.c.y-1);
2603                 }
2604                 break;
2605         case 'Z': /* DECID -- Identify Terminal */
2606                 ttywrite(vtiden, sizeof(vtiden) - 1);
2607                 break;
2608         case 'c': /* RIS -- Reset to inital state */
2609                 treset();
2610                 xresettitle();
2611                 xloadcols();
2612                 break;
2613         case '=': /* DECPAM -- Application keypad */
2614                 term.mode |= MODE_APPKEYPAD;
2615                 break;
2616         case '>': /* DECPNM -- Normal keypad */
2617                 term.mode &= ~MODE_APPKEYPAD;
2618                 break;
2619         case '7': /* DECSC -- Save Cursor */
2620                 tcursor(CURSOR_SAVE);
2621                 break;
2622         case '8': /* DECRC -- Restore Cursor */
2623                 tcursor(CURSOR_LOAD);
2624                 break;
2625         case '\\': /* ST -- String Terminator */
2626                 if(term.esc & ESC_STR_END)
2627                         strhandle();
2628                 break;
2629         default:
2630                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2631                         (uchar) ascii, isprint(ascii)? ascii:'.');
2632                 break;
2633         }
2634         return 1;
2635 }
2636
2637 void
2638 tputc(char *c, int len) {
2639         uchar ascii;
2640         bool control;
2641         long unicodep;
2642         int width;
2643         Glyph *gp;
2644
2645         if(len == 1) {
2646                 width = 1;
2647                 unicodep = ascii = *c;
2648         } else {
2649                 utf8decode(c, &unicodep, UTF_SIZ);
2650                 if ((width = wcwidth(unicodep)) == -1) {
2651                         c = "\357\277\275";     /* UTF_INVALID */
2652                         width = 1;
2653                 }
2654                 ascii = unicodep;
2655         }
2656
2657         if(IS_SET(MODE_PRINT))
2658                 tprinter(c, len);
2659         control = ISCONTROL(unicodep);
2660
2661         /*
2662          * STR sequence must be checked before anything else
2663          * because it uses all following characters until it
2664          * receives a ESC, a SUB, a ST or any other C1 control
2665          * character.
2666          */
2667         if(term.esc & ESC_STR) {
2668                 if(len == 1 &&
2669                    (ascii == '\a' || ascii == 030 ||
2670                     ascii == 032  || ascii == 033 ||
2671                     ISCONTROLC1(unicodep))) {
2672                         term.esc &= ~(ESC_START|ESC_STR);
2673                         term.esc |= ESC_STR_END;
2674                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2675                         memmove(&strescseq.buf[strescseq.len], c, len);
2676                         strescseq.len += len;
2677                         return;
2678                 } else {
2679                 /*
2680                  * Here is a bug in terminals. If the user never sends
2681                  * some code to stop the str or esc command, then st
2682                  * will stop responding. But this is better than
2683                  * silently failing with unknown characters. At least
2684                  * then users will report back.
2685                  *
2686                  * In the case users ever get fixed, here is the code:
2687                  */
2688                 /*
2689                  * term.esc = 0;
2690                  * strhandle();
2691                  */
2692                         return;
2693                 }
2694         }
2695
2696         /*
2697          * Actions of control codes must be performed as soon they arrive
2698          * because they can be embedded inside a control sequence, and
2699          * they must not cause conflicts with sequences.
2700          */
2701         if(control) {
2702                 tcontrolcode(ascii);
2703                 /*
2704                  * control codes are not shown ever
2705                  */
2706                 return;
2707         } else if(term.esc & ESC_START) {
2708                 if(term.esc & ESC_CSI) {
2709                         csiescseq.buf[csiescseq.len++] = ascii;
2710                         if(BETWEEN(ascii, 0x40, 0x7E)
2711                                         || csiescseq.len >= \
2712                                         sizeof(csiescseq.buf)-1) {
2713                                 term.esc = 0;
2714                                 csiparse();
2715                                 csihandle();
2716                         }
2717                         return;
2718                 } else if(term.esc & ESC_ALTCHARSET) {
2719                         tdeftran(ascii);
2720                 } else if(term.esc & ESC_TEST) {
2721                         tdectest(ascii);
2722                 } else {
2723                         if (!eschandle(ascii))
2724                                 return;
2725                         /* sequence already finished */
2726                 }
2727                 term.esc = 0;
2728                 /*
2729                  * All characters which form part of a sequence are not
2730                  * printed
2731                  */
2732                 return;
2733         }
2734         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2735                 selclear(NULL);
2736
2737         gp = &term.line[term.c.y][term.c.x];
2738         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2739                 gp->mode |= ATTR_WRAP;
2740                 tnewline(1);
2741                 gp = &term.line[term.c.y][term.c.x];
2742         }
2743
2744         if(IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2745                 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2746
2747         if(term.c.x+width > term.col) {
2748                 tnewline(1);
2749                 gp = &term.line[term.c.y][term.c.x];
2750         }
2751
2752         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2753
2754         if(width == 2) {
2755                 gp->mode |= ATTR_WIDE;
2756                 if(term.c.x+1 < term.col) {
2757                         gp[1].c[0] = '\0';
2758                         gp[1].mode = ATTR_WDUMMY;
2759                 }
2760         }
2761         if(term.c.x+width < term.col) {
2762                 tmoveto(term.c.x+width, term.c.y);
2763         } else {
2764                 term.c.state |= CURSOR_WRAPNEXT;
2765         }
2766 }
2767
2768 void
2769 tresize(int col, int row) {
2770         int i;
2771         int minrow = MIN(row, term.row);
2772         int mincol = MIN(col, term.col);
2773         int slide = term.c.y - row + 1;
2774         bool *bp;
2775         TCursor c;
2776
2777         if(col < 1 || row < 1) {
2778                 fprintf(stderr,
2779                         "tresize: error resizing to %dx%d\n", col, row);
2780                 return;
2781         }
2782
2783         /* free unneeded rows */
2784         i = 0;
2785         if(slide > 0) {
2786                 /*
2787                  * slide screen to keep cursor where we expect it -
2788                  * tscrollup would work here, but we can optimize to
2789                  * memmove because we're freeing the earlier lines
2790                  */
2791                 for(/* i = 0 */; i < slide; i++) {
2792                         free(term.line[i]);
2793                         free(term.alt[i]);
2794                 }
2795                 memmove(term.line, term.line + slide, row * sizeof(Line));
2796                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2797         }
2798         for(i += row; i < term.row; i++) {
2799                 free(term.line[i]);
2800                 free(term.alt[i]);
2801         }
2802
2803         /* resize to new height */
2804         term.line = xrealloc(term.line, row * sizeof(Line));
2805         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2806         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2807         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2808
2809         /* resize each row to new width, zero-pad if needed */
2810         for(i = 0; i < minrow; i++) {
2811                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2812                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2813         }
2814
2815         /* allocate any new rows */
2816         for(/* i == minrow */; i < row; i++) {
2817                 term.line[i] = xmalloc(col * sizeof(Glyph));
2818                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2819         }
2820         if(col > term.col) {
2821                 bp = term.tabs + term.col;
2822
2823                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2824                 while(--bp > term.tabs && !*bp)
2825                         /* nothing */ ;
2826                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2827                         *bp = 1;
2828         }
2829         /* update terminal size */
2830         term.col = col;
2831         term.row = row;
2832         /* reset scrolling region */
2833         tsetscroll(0, row-1);
2834         /* make use of the LIMIT in tmoveto */
2835         tmoveto(term.c.x, term.c.y);
2836         /* Clearing both screens (it makes dirty all lines) */
2837         c = term.c;
2838         for(i = 0; i < 2; i++) {
2839                 if(mincol < col && 0 < minrow) {
2840                         tclearregion(mincol, 0, col - 1, minrow - 1);
2841                 }
2842                 if(0 < col && minrow < row) {
2843                         tclearregion(0, minrow, col - 1, row - 1);
2844                 }
2845                 tswapscreen();
2846                 tcursor(CURSOR_LOAD);
2847         }
2848         term.c = c;
2849 }
2850
2851 void
2852 xresize(int col, int row) {
2853         xw.tw = MAX(1, col * xw.cw);
2854         xw.th = MAX(1, row * xw.ch);
2855
2856         XFreePixmap(xw.dpy, xw.buf);
2857         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2858                         DefaultDepth(xw.dpy, xw.scr));
2859         XftDrawChange(xw.draw, xw.buf);
2860         xclear(0, 0, xw.w, xw.h);
2861 }
2862
2863 ushort
2864 sixd_to_16bit(int x) {
2865         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2866 }
2867
2868 void
2869 xloadcols(void) {
2870         int i;
2871         XRenderColor color = { .alpha = 0xffff };
2872         static bool loaded;
2873         Color *cp;
2874
2875         if(loaded) {
2876                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2877                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2878         }
2879
2880         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2881         for(i = 0; i < LEN(colorname); i++) {
2882                 if(!colorname[i])
2883                         continue;
2884                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2885                         die("Could not allocate color '%s'\n", colorname[i]);
2886                 }
2887         }
2888
2889         /* load colors [16-231] ; same colors as xterm */
2890         for(i = 16; i < 6*6*6+16; i++) {
2891                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2892                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2893                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2894                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2895                         die("Could not allocate color %d\n", i);
2896         }
2897
2898         /* load colors [232-255] ; grayscale */
2899         for(; i < 256; i++) {
2900                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2901                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2902                         die("Could not allocate color %d\n", i);
2903         }
2904         loaded = true;
2905 }
2906
2907 int
2908 xsetcolorname(int x, const char *name) {
2909         XRenderColor color = { .alpha = 0xffff };
2910         Color ncolor;
2911
2912         if(!BETWEEN(x, 0, LEN(colorname)))
2913                 return 1;
2914
2915         if(!name) {
2916                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2917                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2918                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2919                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2920                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2921                                                 xw.cmap, &color, &ncolor)) {
2922                                 return 1;
2923                         }
2924
2925                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2926                         dc.col[x] = ncolor;
2927                         return 0;
2928                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2929                         color.red = color.green = color.blue = \
2930                                     0x0808 + 0x0a0a * (x - (16 + 216));
2931                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2932                                                 xw.cmap, &color, &ncolor)) {
2933                                 return 1;
2934                         }
2935
2936                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2937                         dc.col[x] = ncolor;
2938                         return 0;
2939                 } else { /* system colors */
2940                         name = colorname[x];
2941                 }
2942         }
2943         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2944                 return 1;
2945
2946         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2947         dc.col[x] = ncolor;
2948         return 0;
2949 }
2950
2951 void
2952 xtermclear(int col1, int row1, int col2, int row2) {
2953         XftDrawRect(xw.draw,
2954                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2955                         borderpx + col1 * xw.cw,
2956                         borderpx + row1 * xw.ch,
2957                         (col2-col1+1) * xw.cw,
2958                         (row2-row1+1) * xw.ch);
2959 }
2960
2961 /*
2962  * Absolute coordinates.
2963  */
2964 void
2965 xclear(int x1, int y1, int x2, int y2) {
2966         XftDrawRect(xw.draw,
2967                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2968                         x1, y1, x2-x1, y2-y1);
2969 }
2970
2971 void
2972 xhints(void) {
2973         XClassHint class = {opt_class ? opt_class : termname, termname};
2974         XWMHints wm = {.flags = InputHint, .input = 1};
2975         XSizeHints *sizeh = NULL;
2976
2977         sizeh = XAllocSizeHints();
2978
2979         sizeh->flags = PSize | PResizeInc | PBaseSize;
2980         sizeh->height = xw.h;
2981         sizeh->width = xw.w;
2982         sizeh->height_inc = xw.ch;
2983         sizeh->width_inc = xw.cw;
2984         sizeh->base_height = 2 * borderpx;
2985         sizeh->base_width = 2 * borderpx;
2986         if(xw.isfixed == True) {
2987                 sizeh->flags |= PMaxSize | PMinSize;
2988                 sizeh->min_width = sizeh->max_width = xw.w;
2989                 sizeh->min_height = sizeh->max_height = xw.h;
2990         }
2991         if(xw.gm & (XValue|YValue)) {
2992                 sizeh->flags |= USPosition | PWinGravity;
2993                 sizeh->x = xw.l;
2994                 sizeh->y = xw.t;
2995                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2996         }
2997
2998         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2999                         &class);
3000         XFree(sizeh);
3001 }
3002
3003 int
3004 xgeommasktogravity(int mask) {
3005         switch(mask & (XNegative|YNegative)) {
3006         case 0:
3007                 return NorthWestGravity;
3008         case XNegative:
3009                 return NorthEastGravity;
3010         case YNegative:
3011                 return SouthWestGravity;
3012         }
3013         return SouthEastGravity;
3014 }
3015
3016 int
3017 xloadfont(Font *f, FcPattern *pattern) {
3018         FcPattern *match;
3019         FcResult result;
3020
3021         match = FcFontMatch(NULL, pattern, &result);
3022         if(!match)
3023                 return 1;
3024
3025         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
3026                 FcPatternDestroy(match);
3027                 return 1;
3028         }
3029
3030         f->set = NULL;
3031         f->pattern = FcPatternDuplicate(pattern);
3032
3033         f->ascent = f->match->ascent;
3034         f->descent = f->match->descent;
3035         f->lbearing = 0;
3036         f->rbearing = f->match->max_advance_width;
3037
3038         f->height = f->ascent + f->descent;
3039         f->width = f->lbearing + f->rbearing;
3040
3041         return 0;
3042 }
3043
3044 void
3045 xloadfonts(char *fontstr, double fontsize) {
3046         FcPattern *pattern;
3047         FcResult r_sz, r_psz;
3048         double fontval;
3049         float ceilf(float);
3050
3051         if(fontstr[0] == '-') {
3052                 pattern = XftXlfdParse(fontstr, False, False);
3053         } else {
3054                 pattern = FcNameParse((FcChar8 *)fontstr);
3055         }
3056
3057         if(!pattern)
3058                 die("st: can't open font %s\n", fontstr);
3059
3060         if(fontsize > 1) {
3061                 FcPatternDel(pattern, FC_PIXEL_SIZE);
3062                 FcPatternDel(pattern, FC_SIZE);
3063                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
3064                 usedfontsize = fontsize;
3065         } else {
3066                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
3067                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
3068                 if(r_psz == FcResultMatch) {
3069                         usedfontsize = fontval;
3070                 } else if(r_sz == FcResultMatch) {
3071                         usedfontsize = -1;
3072                 } else {
3073                         /*
3074                          * Default font size is 12, if none given. This is to
3075                          * have a known usedfontsize value.
3076                          */
3077                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3078                         usedfontsize = 12;
3079                 }
3080                 defaultfontsize = usedfontsize;
3081         }
3082
3083         FcConfigSubstitute(0, pattern, FcMatchPattern);
3084         FcDefaultSubstitute(pattern);
3085
3086         if(xloadfont(&dc.font, pattern))
3087                 die("st: can't open font %s\n", fontstr);
3088
3089         if(usedfontsize < 0) {
3090                 FcPatternGetDouble(dc.font.match->pattern,
3091                                    FC_PIXEL_SIZE, 0, &fontval);
3092                 usedfontsize = fontval;
3093                 if(fontsize == 0)
3094                         defaultfontsize = fontval;
3095         }
3096
3097         /* Setting character width and height. */
3098         xw.cw = ceilf(dc.font.width * cwscale);
3099         xw.ch = ceilf(dc.font.height * chscale);
3100
3101         FcPatternDel(pattern, FC_SLANT);
3102         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3103         if(xloadfont(&dc.ifont, pattern))
3104                 die("st: can't open font %s\n", fontstr);
3105
3106         FcPatternDel(pattern, FC_WEIGHT);
3107         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3108         if(xloadfont(&dc.ibfont, pattern))
3109                 die("st: can't open font %s\n", fontstr);
3110
3111         FcPatternDel(pattern, FC_SLANT);
3112         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3113         if(xloadfont(&dc.bfont, pattern))
3114                 die("st: can't open font %s\n", fontstr);
3115
3116         FcPatternDestroy(pattern);
3117 }
3118
3119 int
3120 xloadfontset(Font *f) {
3121         FcResult result;
3122
3123         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3124                 return 1;
3125         return 0;
3126 }
3127
3128 void
3129 xunloadfont(Font *f) {
3130         XftFontClose(xw.dpy, f->match);
3131         FcPatternDestroy(f->pattern);
3132         if(f->set)
3133                 FcFontSetDestroy(f->set);
3134 }
3135
3136 void
3137 xunloadfonts(void) {
3138         /* Free the loaded fonts in the font cache.  */
3139         while(frclen > 0)
3140                 XftFontClose(xw.dpy, frc[--frclen].font);
3141
3142         xunloadfont(&dc.font);
3143         xunloadfont(&dc.bfont);
3144         xunloadfont(&dc.ifont);
3145         xunloadfont(&dc.ibfont);
3146 }
3147
3148 void
3149 xzoom(const Arg *arg) {
3150         Arg larg;
3151
3152         larg.i = usedfontsize + arg->i;
3153         xzoomabs(&larg);
3154 }
3155
3156 void
3157 xzoomabs(const Arg *arg) {
3158         xunloadfonts();
3159         xloadfonts(usedfont, arg->i);
3160         cresize(0, 0);
3161         redraw();
3162         xhints();
3163 }
3164
3165 void
3166 xzoomreset(const Arg *arg) {
3167         Arg larg;
3168
3169         if(defaultfontsize > 0) {
3170                 larg.i = defaultfontsize;
3171                 xzoomabs(&larg);
3172         }
3173 }
3174
3175 void
3176 xinit(void) {
3177         XGCValues gcvalues;
3178         Cursor cursor;
3179         Window parent;
3180         pid_t thispid = getpid();
3181
3182         if(!(xw.dpy = XOpenDisplay(NULL)))
3183                 die("Can't open display\n");
3184         xw.scr = XDefaultScreen(xw.dpy);
3185         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3186
3187         /* font */
3188         if(!FcInit())
3189                 die("Could not init fontconfig.\n");
3190
3191         usedfont = (opt_font == NULL)? font : opt_font;
3192         xloadfonts(usedfont, 0);
3193
3194         /* colors */
3195         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3196         xloadcols();
3197
3198         /* adjust fixed window geometry */
3199         xw.w = 2 * borderpx + term.col * xw.cw;
3200         xw.h = 2 * borderpx + term.row * xw.ch;
3201         if(xw.gm & XNegative)
3202                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3203         if(xw.gm & YNegative)
3204                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3205
3206         /* Events */
3207         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3208         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3209         xw.attrs.bit_gravity = NorthWestGravity;
3210         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3211                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3212                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3213         xw.attrs.colormap = xw.cmap;
3214
3215         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3216                 parent = XRootWindow(xw.dpy, xw.scr);
3217         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3218                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3219                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3220                         | CWEventMask | CWColormap, &xw.attrs);
3221
3222         memset(&gcvalues, 0, sizeof(gcvalues));
3223         gcvalues.graphics_exposures = False;
3224         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3225                         &gcvalues);
3226         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3227                         DefaultDepth(xw.dpy, xw.scr));
3228         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3229         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3230
3231         /* Xft rendering context */
3232         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3233
3234         /* input methods */
3235         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3236                 XSetLocaleModifiers("@im=local");
3237                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3238                         XSetLocaleModifiers("@im=");
3239                         if((xw.xim = XOpenIM(xw.dpy,
3240                                         NULL, NULL, NULL)) == NULL) {
3241                                 die("XOpenIM failed. Could not open input"
3242                                         " device.\n");
3243                         }
3244                 }
3245         }
3246         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3247                                            | XIMStatusNothing, XNClientWindow, xw.win,
3248                                            XNFocusWindow, xw.win, NULL);
3249         if(xw.xic == NULL)
3250                 die("XCreateIC failed. Could not obtain input method.\n");
3251
3252         /* white cursor, black outline */
3253         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3254         XDefineCursor(xw.dpy, xw.win, cursor);
3255         XRecolorCursor(xw.dpy, cursor,
3256                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3257                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3258
3259         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3260         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3261         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3262         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3263
3264         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3265         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3266                         PropModeReplace, (uchar *)&thispid, 1);
3267
3268         xresettitle();
3269         XMapWindow(xw.dpy, xw.win);
3270         xhints();
3271         XSync(xw.dpy, False);
3272 }
3273
3274 void
3275 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3276         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3277             width = charlen * xw.cw, xp, i;
3278         int frcflags, charexists;
3279         int u8fl, u8fblen, u8cblen, doesexist;
3280         char *u8c, *u8fs;
3281         long unicodep;
3282         Font *font = &dc.font;
3283         FcResult fcres;
3284         FcPattern *fcpattern, *fontpattern;
3285         FcFontSet *fcsets[] = { NULL };
3286         FcCharSet *fccharset;
3287         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3288         XRenderColor colfg, colbg;
3289         XRectangle r;
3290         int oneatatime;
3291
3292         frcflags = FRC_NORMAL;
3293
3294         if(base.mode & ATTR_ITALIC) {
3295                 if(base.fg == defaultfg)
3296                         base.fg = defaultitalic;
3297                 font = &dc.ifont;
3298                 frcflags = FRC_ITALIC;
3299         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3300                 if(base.fg == defaultfg)
3301                         base.fg = defaultitalic;
3302                 font = &dc.ibfont;
3303                 frcflags = FRC_ITALICBOLD;
3304         } else if(base.mode & ATTR_UNDERLINE) {
3305                 if(base.fg == defaultfg)
3306                         base.fg = defaultunderline;
3307         }
3308
3309         if(IS_TRUECOL(base.fg)) {
3310                 colfg.alpha = 0xffff;
3311                 colfg.red = TRUERED(base.fg);
3312                 colfg.green = TRUEGREEN(base.fg);
3313                 colfg.blue = TRUEBLUE(base.fg);
3314                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3315                 fg = &truefg;
3316         } else {
3317                 fg = &dc.col[base.fg];
3318         }
3319
3320         if(IS_TRUECOL(base.bg)) {
3321                 colbg.alpha = 0xffff;
3322                 colbg.green = TRUEGREEN(base.bg);
3323                 colbg.red = TRUERED(base.bg);
3324                 colbg.blue = TRUEBLUE(base.bg);
3325                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3326                 bg = &truebg;
3327         } else {
3328                 bg = &dc.col[base.bg];
3329         }
3330
3331         if(base.mode & ATTR_BOLD) {
3332                 /*
3333                  * change basic system colors [0-7]
3334                  * to bright system colors [8-15]
3335                  */
3336                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3337                         fg = &dc.col[base.fg + 8];
3338
3339                 if(base.mode & ATTR_ITALIC) {
3340                         font = &dc.ibfont;
3341                         frcflags = FRC_ITALICBOLD;
3342                 } else {
3343                         font = &dc.bfont;
3344                         frcflags = FRC_BOLD;
3345                 }
3346         }
3347
3348         if(IS_SET(MODE_REVERSE)) {
3349                 if(fg == &dc.col[defaultfg]) {
3350                         fg = &dc.col[defaultbg];
3351                 } else {
3352                         colfg.red = ~fg->color.red;
3353                         colfg.green = ~fg->color.green;
3354                         colfg.blue = ~fg->color.blue;
3355                         colfg.alpha = fg->color.alpha;
3356                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3357                                         &revfg);
3358                         fg = &revfg;
3359                 }
3360
3361                 if(bg == &dc.col[defaultbg]) {
3362                         bg = &dc.col[defaultfg];
3363                 } else {
3364                         colbg.red = ~bg->color.red;
3365                         colbg.green = ~bg->color.green;
3366                         colbg.blue = ~bg->color.blue;
3367                         colbg.alpha = bg->color.alpha;
3368                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3369                                         &revbg);
3370                         bg = &revbg;
3371                 }
3372         }
3373
3374         if(base.mode & ATTR_REVERSE) {
3375                 temp = fg;
3376                 fg = bg;
3377                 bg = temp;
3378         }
3379
3380         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3381                 colfg.red = fg->color.red / 2;
3382                 colfg.green = fg->color.green / 2;
3383                 colfg.blue = fg->color.blue / 2;
3384                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3385                 fg = &revfg;
3386         }
3387
3388         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3389                 fg = bg;
3390
3391         if(base.mode & ATTR_INVISIBLE)
3392                 fg = bg;
3393
3394         /* Intelligent cleaning up of the borders. */
3395         if(x == 0) {
3396                 xclear(0, (y == 0)? 0 : winy, borderpx,
3397                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3398         }
3399         if(x + charlen >= term.col) {
3400                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3401                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3402         }
3403         if(y == 0)
3404                 xclear(winx, 0, winx + width, borderpx);
3405         if(y == term.row-1)
3406                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3407
3408         /* Clean up the region we want to draw to. */
3409         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3410
3411         /* Set the clip region because Xft is sometimes dirty. */
3412         r.x = 0;
3413         r.y = 0;
3414         r.height = xw.ch;
3415         r.width = width;
3416         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3417
3418         for(xp = winx; bytelen > 0;) {
3419                 /*
3420                  * Search for the range in the to be printed string of glyphs
3421                  * that are in the main font. Then print that range. If
3422                  * some glyph is found that is not in the font, do the
3423                  * fallback dance.
3424                  */
3425                 u8fs = s;
3426                 u8fblen = 0;
3427                 u8fl = 0;
3428                 oneatatime = font->width != xw.cw;
3429                 for(;;) {
3430                         u8c = s;
3431                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3432                         s += u8cblen;
3433                         bytelen -= u8cblen;
3434
3435                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3436                         if(doesexist) {
3437                                         u8fl++;
3438                                         u8fblen += u8cblen;
3439                                         if(!oneatatime && bytelen > 0)
3440                                                         continue;
3441                         }
3442
3443                         if(u8fl > 0) {
3444                                 XftDrawStringUtf8(xw.draw, fg,
3445                                                 font->match, xp,
3446                                                 winy + font->ascent,
3447                                                 (FcChar8 *)u8fs,
3448                                                 u8fblen);
3449                                 xp += xw.cw * u8fl;
3450                         }
3451                         break;
3452                 }
3453                 if(doesexist) {
3454                         if(oneatatime)
3455                                 continue;
3456                         break;
3457                 }
3458
3459                 /* Search the font cache. */
3460                 for(i = 0; i < frclen; i++) {
3461                         charexists = XftCharExists(xw.dpy, frc[i].font, unicodep);
3462                         /* Everything correct. */
3463                         if(charexists && frc[i].flags == frcflags)
3464                                 break;
3465                         /* We got a default font for a not found glyph. */
3466                         if(!charexists && frc[i].flags == frcflags \
3467                                         && frc[i].unicodep == unicodep) {
3468                                 break;
3469                         }
3470                 }
3471
3472                 /* Nothing was found. */
3473                 if(i >= frclen) {
3474                         if(!font->set)
3475                                 xloadfontset(font);
3476                         fcsets[0] = font->set;
3477
3478                         /*
3479                          * Nothing was found in the cache. Now use
3480                          * some dozen of Fontconfig calls to get the
3481                          * font for one single character.
3482                          *
3483                          * Xft and fontconfig are design failures.
3484                          */
3485                         fcpattern = FcPatternDuplicate(font->pattern);
3486                         fccharset = FcCharSetCreate();
3487
3488                         FcCharSetAddChar(fccharset, unicodep);
3489                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3490                                         fccharset);
3491                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3492                                         FcTrue);
3493
3494                         FcConfigSubstitute(0, fcpattern,
3495                                         FcMatchPattern);
3496                         FcDefaultSubstitute(fcpattern);
3497
3498                         fontpattern = FcFontSetMatch(0, fcsets, 1,
3499                                         fcpattern, &fcres);
3500
3501                         /*
3502                          * Overwrite or create the new cache entry.
3503                          */
3504                         if(frclen >= LEN(frc)) {
3505                                 frclen = LEN(frc) - 1;
3506                                 XftFontClose(xw.dpy, frc[frclen].font);
3507                                 frc[frclen].unicodep = 0;
3508                         }
3509
3510                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3511                                         fontpattern);
3512                         frc[frclen].flags = frcflags;
3513                         frc[frclen].unicodep = unicodep;
3514
3515                         i = frclen;
3516                         frclen++;
3517
3518                         FcPatternDestroy(fcpattern);
3519                         FcCharSetDestroy(fccharset);
3520                 }
3521
3522                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3523                                 xp, winy + frc[i].font->ascent,
3524                                 (FcChar8 *)u8c, u8cblen);
3525
3526                 xp += xw.cw * wcwidth(unicodep);
3527         }
3528
3529         /*
3530          * This is how the loop above actually should be. Why does the
3531          * application have to care about font details?
3532          *
3533          * I have to repeat: Xft and Fontconfig are design failures.
3534          */
3535         /*
3536         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3537                         winy + font->ascent, (FcChar8 *)s, bytelen);
3538         */
3539
3540         if(base.mode & ATTR_UNDERLINE) {
3541                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3542                                 width, 1);
3543         }
3544
3545         if(base.mode & ATTR_STRUCK) {
3546                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3547                                 width, 1);
3548         }
3549
3550         /* Reset clip to none. */
3551         XftDrawSetClip(xw.draw, 0);
3552 }
3553
3554 void
3555 xdrawcursor(void) {
3556         static int oldx = 0, oldy = 0;
3557         int sl, width, curx;
3558         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3559
3560         LIMIT(oldx, 0, term.col-1);
3561         LIMIT(oldy, 0, term.row-1);
3562
3563         curx = term.c.x;
3564
3565         /* adjust position if in dummy */
3566         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3567                 oldx--;
3568         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3569                 curx--;
3570
3571         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3572
3573         /* remove the old cursor */
3574         sl = utf8len(term.line[oldy][oldx].c);
3575         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3576         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3577                         oldy, width, sl);
3578
3579         if(IS_SET(MODE_HIDE))
3580                 return;
3581
3582         /* draw the new one */
3583         if(xw.state & WIN_FOCUSED) {
3584                 switch (xw.cursor) {
3585                         case 0: /* Blinking Block */
3586                         case 1: /* Blinking Block (Default) */
3587                         case 2: /* Steady Block */
3588                                 if(IS_SET(MODE_REVERSE)) {
3589                                                 g.mode |= ATTR_REVERSE;
3590                                                 g.fg = defaultcs;
3591                                                 g.bg = defaultfg;
3592                                         }
3593
3594                                 sl = utf8len(g.c);
3595                                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3596                                         ? 2 : 1;
3597                                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3598                                 break;
3599                         case 3: /* Blinking Underline */
3600                         case 4: /* Steady Underline */
3601                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3602                                                 borderpx + curx * xw.cw,
3603                                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3604                                                 xw.cw, 1);
3605                                 break;
3606                         case 5: /* Blinking bar */
3607                         case 6: /* Steady bar */
3608                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3609                                                                 borderpx + curx * xw.cw,
3610                                                                 borderpx + term.c.y * xw.ch,
3611                                                                 1, xw.ch);
3612                                 break;
3613                 }
3614         } else {
3615                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3616                                 borderpx + curx * xw.cw,
3617                                 borderpx + term.c.y * xw.ch,
3618                                 xw.cw - 1, 1);
3619                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3620                                 borderpx + curx * xw.cw,
3621                                 borderpx + term.c.y * xw.ch,
3622                                 1, xw.ch - 1);
3623                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3624                                 borderpx + (curx + 1) * xw.cw - 1,
3625                                 borderpx + term.c.y * xw.ch,
3626                                 1, xw.ch - 1);
3627                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3628                                 borderpx + curx * xw.cw,
3629                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3630                                 xw.cw, 1);
3631         }
3632         oldx = curx, oldy = term.c.y;
3633 }
3634
3635
3636 void
3637 xsettitle(char *p) {
3638         XTextProperty prop;
3639
3640         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3641                         &prop);
3642         XSetWMName(xw.dpy, xw.win, &prop);
3643         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3644         XFree(prop.value);
3645 }
3646
3647 void
3648 xresettitle(void) {
3649         xsettitle(opt_title ? opt_title : "st");
3650 }
3651
3652 void
3653 redraw(void) {
3654         tfulldirt();
3655         draw();
3656 }
3657
3658 void
3659 draw(void) {
3660         drawregion(0, 0, term.col, term.row);
3661         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3662                         xw.h, 0, 0);
3663         XSetForeground(xw.dpy, dc.gc,
3664                         dc.col[IS_SET(MODE_REVERSE)?
3665                                 defaultfg : defaultbg].pixel);
3666 }
3667
3668 void
3669 drawregion(int x1, int y1, int x2, int y2) {
3670         int ic, ib, x, y, ox, sl;
3671         Glyph base, new;
3672         char buf[DRAW_BUF_SIZ];
3673         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3674         long unicodep;
3675
3676         if(!(xw.state & WIN_VISIBLE))
3677                 return;
3678
3679         for(y = y1; y < y2; y++) {
3680                 if(!term.dirty[y])
3681                         continue;
3682
3683                 xtermclear(0, y, term.col, y);
3684                 term.dirty[y] = 0;
3685                 base = term.line[y][0];
3686                 ic = ib = ox = 0;
3687                 for(x = x1; x < x2; x++) {
3688                         new = term.line[y][x];
3689                         if(new.mode == ATTR_WDUMMY)
3690                                 continue;
3691                         if(ena_sel && selected(x, y))
3692                                 new.mode ^= ATTR_REVERSE;
3693                         if(ib > 0 && (ATTRCMP(base, new)
3694                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3695                                 xdraws(buf, base, ox, y, ic, ib);
3696                                 ic = ib = 0;
3697                         }
3698                         if(ib == 0) {
3699                                 ox = x;
3700                                 base = new;
3701                         }
3702
3703                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3704                         memcpy(buf+ib, new.c, sl);
3705                         ib += sl;
3706                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3707                 }
3708                 if(ib > 0)
3709                         xdraws(buf, base, ox, y, ic, ib);
3710         }
3711         xdrawcursor();
3712 }
3713
3714 void
3715 expose(XEvent *ev) {
3716         XExposeEvent *e = &ev->xexpose;
3717
3718         if(xw.state & WIN_REDRAW) {
3719                 if(!e->count)
3720                         xw.state &= ~WIN_REDRAW;
3721         }
3722         redraw();
3723 }
3724
3725 void
3726 visibility(XEvent *ev) {
3727         XVisibilityEvent *e = &ev->xvisibility;
3728
3729         if(e->state == VisibilityFullyObscured) {
3730                 xw.state &= ~WIN_VISIBLE;
3731         } else if(!(xw.state & WIN_VISIBLE)) {
3732                 /* need a full redraw for next Expose, not just a buf copy */
3733                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3734         }
3735 }
3736
3737 void
3738 unmap(XEvent *ev) {
3739         xw.state &= ~WIN_VISIBLE;
3740 }
3741
3742 void
3743 xsetpointermotion(int set) {
3744         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3745         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3746 }
3747
3748 void
3749 xseturgency(int add) {
3750         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3751
3752         MODBIT(h->flags, add, XUrgencyHint);
3753         XSetWMHints(xw.dpy, xw.win, h);
3754         XFree(h);
3755 }
3756
3757 void
3758 focus(XEvent *ev) {
3759         XFocusChangeEvent *e = &ev->xfocus;
3760
3761         if(e->mode == NotifyGrab)
3762                 return;
3763
3764         if(ev->type == FocusIn) {
3765                 XSetICFocus(xw.xic);
3766                 xw.state |= WIN_FOCUSED;
3767                 xseturgency(0);
3768                 if(IS_SET(MODE_FOCUS))
3769                         ttywrite("\033[I", 3);
3770         } else {
3771                 XUnsetICFocus(xw.xic);
3772                 xw.state &= ~WIN_FOCUSED;
3773                 if(IS_SET(MODE_FOCUS))
3774                         ttywrite("\033[O", 3);
3775         }
3776 }
3777
3778 bool
3779 match(uint mask, uint state) {
3780         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3781 }
3782
3783 void
3784 numlock(const Arg *dummy) {
3785         term.numlock ^= 1;
3786 }
3787
3788 char*
3789 kmap(KeySym k, uint state) {
3790         Key *kp;
3791         int i;
3792
3793         /* Check for mapped keys out of X11 function keys. */
3794         for(i = 0; i < LEN(mappedkeys); i++) {
3795                 if(mappedkeys[i] == k)
3796                         break;
3797         }
3798         if(i == LEN(mappedkeys)) {
3799                 if((k & 0xFFFF) < 0xFD00)
3800                         return NULL;
3801         }
3802
3803         for(kp = key; kp < key + LEN(key); kp++) {
3804                 if(kp->k != k)
3805                         continue;
3806
3807                 if(!match(kp->mask, state))
3808                         continue;
3809
3810                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3811                         continue;
3812                 if(term.numlock && kp->appkey == 2)
3813                         continue;
3814
3815                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3816                         continue;
3817
3818                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3819                         continue;
3820
3821                 return kp->s;
3822         }
3823
3824         return NULL;
3825 }
3826
3827 void
3828 kpress(XEvent *ev) {
3829         XKeyEvent *e = &ev->xkey;
3830         KeySym ksym;
3831         char buf[32], *customkey;
3832         int len;
3833         long c;
3834         Status status;
3835         Shortcut *bp;
3836
3837         if(IS_SET(MODE_KBDLOCK))
3838                 return;
3839
3840         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3841         /* 1. shortcuts */
3842         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3843                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3844                         bp->func(&(bp->arg));
3845                         return;
3846                 }
3847         }
3848
3849         /* 2. custom keys from config.h */
3850         if((customkey = kmap(ksym, e->state))) {
3851                 ttysend(customkey, strlen(customkey));
3852                 return;
3853         }
3854
3855         /* 3. composed string from input method */
3856         if(len == 0)
3857                 return;
3858         if(len == 1 && e->state & Mod1Mask) {
3859                 if(IS_SET(MODE_8BIT)) {
3860                         if(*buf < 0177) {
3861                                 c = *buf | 0x80;
3862                                 len = utf8encode(c, buf, UTF_SIZ);
3863                         }
3864                 } else {
3865                         buf[1] = buf[0];
3866                         buf[0] = '\033';
3867                         len = 2;
3868                 }
3869         }
3870         ttysend(buf, len);
3871 }
3872
3873
3874 void
3875 cmessage(XEvent *e) {
3876         /*
3877          * See xembed specs
3878          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3879          */
3880         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3881                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3882                         xw.state |= WIN_FOCUSED;
3883                         xseturgency(0);
3884                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3885                         xw.state &= ~WIN_FOCUSED;
3886                 }
3887         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3888                 /* Send SIGHUP to shell */
3889                 kill(pid, SIGHUP);
3890                 exit(EXIT_SUCCESS);
3891         }
3892 }
3893
3894 void
3895 cresize(int width, int height) {
3896         int col, row;
3897
3898         if(width != 0)
3899                 xw.w = width;
3900         if(height != 0)
3901                 xw.h = height;
3902
3903         col = (xw.w - 2 * borderpx) / xw.cw;
3904         row = (xw.h - 2 * borderpx) / xw.ch;
3905
3906         tresize(col, row);
3907         xresize(col, row);
3908         ttyresize();
3909 }
3910
3911 void
3912 resize(XEvent *e) {
3913         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3914                 return;
3915
3916         cresize(e->xconfigure.width, e->xconfigure.height);
3917 }
3918
3919 void
3920 run(void) {
3921         XEvent ev;
3922         int w = xw.w, h = xw.h;
3923         fd_set rfd;
3924         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3925         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3926         long deltatime;
3927
3928         /* Waiting for window mapping */
3929         while(1) {
3930                 XNextEvent(xw.dpy, &ev);
3931                 if(XFilterEvent(&ev, None))
3932                         continue;
3933                 if(ev.type == ConfigureNotify) {
3934                         w = ev.xconfigure.width;
3935                         h = ev.xconfigure.height;
3936                 } else if(ev.type == MapNotify) {
3937                         break;
3938                 }
3939         }
3940
3941         ttynew();
3942         cresize(w, h);
3943
3944         clock_gettime(CLOCK_MONOTONIC, &last);
3945         lastblink = last;
3946
3947         for(xev = actionfps;;) {
3948                 FD_ZERO(&rfd);
3949                 FD_SET(cmdfd, &rfd);
3950                 FD_SET(xfd, &rfd);
3951
3952                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3953                         if(errno == EINTR)
3954                                 continue;
3955                         die("select failed: %s\n", strerror(errno));
3956                 }
3957                 if(FD_ISSET(cmdfd, &rfd)) {
3958                         ttyread();
3959                         if(blinktimeout) {
3960                                 blinkset = tattrset(ATTR_BLINK);
3961                                 if(!blinkset)
3962                                         MODBIT(term.mode, 0, MODE_BLINK);
3963                         }
3964                 }
3965
3966                 if(FD_ISSET(xfd, &rfd))
3967                         xev = actionfps;
3968
3969                 clock_gettime(CLOCK_MONOTONIC, &now);
3970                 drawtimeout.tv_sec = 0;
3971                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3972                 tv = &drawtimeout;
3973
3974                 dodraw = 0;
3975                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3976                         tsetdirtattr(ATTR_BLINK);
3977                         term.mode ^= MODE_BLINK;
3978                         lastblink = now;
3979                         dodraw = 1;
3980                 }
3981                 deltatime = TIMEDIFF(now, last);
3982                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3983                                 || deltatime < 0) {
3984                         dodraw = 1;
3985                         last = now;
3986                 }
3987
3988                 if(dodraw) {
3989                         while(XPending(xw.dpy)) {
3990                                 XNextEvent(xw.dpy, &ev);
3991                                 if(XFilterEvent(&ev, None))
3992                                         continue;
3993                                 if(handler[ev.type])
3994                                         (handler[ev.type])(&ev);
3995                         }
3996
3997                         draw();
3998                         XFlush(xw.dpy);
3999
4000                         if(xev && !FD_ISSET(xfd, &rfd))
4001                                 xev--;
4002                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
4003                                 if(blinkset) {
4004                                         if(TIMEDIFF(now, lastblink) \
4005                                                         > blinktimeout) {
4006                                                 drawtimeout.tv_nsec = 1000;
4007                                         } else {
4008                                                 drawtimeout.tv_nsec = (1E6 * \
4009                                                         (blinktimeout - \
4010                                                         TIMEDIFF(now,
4011                                                                 lastblink)));
4012                                         }
4013                                         drawtimeout.tv_sec = \
4014                                             drawtimeout.tv_nsec / 1E9;
4015                                         drawtimeout.tv_nsec %= (long)1E9;
4016                                 } else {
4017                                         tv = NULL;
4018                                 }
4019                         }
4020                 }
4021         }
4022 }
4023
4024 void
4025 usage(void) {
4026         die("%s " VERSION " (c) 2010-2015 st engineers\n" \
4027         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4028         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
4029 }
4030
4031 int
4032 main(int argc, char *argv[]) {
4033         char *titles;
4034         uint cols = 80, rows = 24;
4035
4036         xw.l = xw.t = 0;
4037         xw.isfixed = False;
4038         xw.cursor = 0;
4039
4040         ARGBEGIN {
4041         case 'a':
4042                 allowaltscreen = false;
4043                 break;
4044         case 'c':
4045                 opt_class = EARGF(usage());
4046                 break;
4047         case 'e':
4048                 /* eat all remaining arguments */
4049                 if(argc > 1) {
4050                         opt_cmd = &argv[1];
4051                         if(argv[1] != NULL && opt_title == NULL) {
4052                                 titles = xstrdup(argv[1]);
4053                                 opt_title = basename(titles);
4054                         }
4055                 }
4056                 goto run;
4057         case 'f':
4058                 opt_font = EARGF(usage());
4059                 break;
4060         case 'g':
4061                 xw.gm = XParseGeometry(EARGF(usage()),
4062                                 &xw.l, &xw.t, &cols, &rows);
4063                 break;
4064         case 'i':
4065                 xw.isfixed = True;
4066                 break;
4067         case 'o':
4068                 opt_io = EARGF(usage());
4069                 break;
4070         case 't':
4071                 opt_title = EARGF(usage());
4072                 break;
4073         case 'w':
4074                 opt_embed = EARGF(usage());
4075                 break;
4076         case 'v':
4077         default:
4078                 usage();
4079         } ARGEND;
4080
4081 run:
4082         setlocale(LC_CTYPE, "");
4083         XSetLocaleModifiers("");
4084         tnew(cols? cols : 1, rows? rows : 1);
4085         xinit();
4086         selinit();
4087         run();
4088
4089         return 0;
4090 }
4091