st.c

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