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