st.c

   1 /* See LICENSE for license 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 XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 /* macros */
  66 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  67 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  68 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  69 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  70 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  71 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  72 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  73 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  74 #define ISDELIM(u) (utf8strchr(worddelimiters, u) != NULL)
  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         ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1 << 0,
 117         MODE_INSERT      = 1 << 1,
 118         MODE_APPKEYPAD   = 1 << 2,
 119         MODE_ALTSCREEN   = 1 << 3,
 120         MODE_CRLF        = 1 << 4,
 121         MODE_MOUSEBTN    = 1 << 5,
 122         MODE_MOUSEMOTION = 1 << 6,
 123         MODE_REVERSE     = 1 << 7,
 124         MODE_KBDLOCK     = 1 << 8,
 125         MODE_HIDE        = 1 << 9,
 126         MODE_ECHO        = 1 << 10,
 127         MODE_APPCURSOR   = 1 << 11,
 128         MODE_MOUSESGR    = 1 << 12,
 129         MODE_8BIT        = 1 << 13,
 130         MODE_BLINK       = 1 << 14,
 131         MODE_FBLINK      = 1 << 15,
 132         MODE_FOCUS       = 1 << 16,
 133         MODE_MOUSEX10    = 1 << 17,
 134         MODE_MOUSEMANY   = 1 << 18,
 135         MODE_BRCKTPASTE  = 1 << 19,
 136         MODE_PRINT       = 1 << 20,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_FOCUSED = 2
 163 };
 164
 165 enum selection_mode {
 166         SEL_IDLE = 0,
 167         SEL_EMPTY = 1,
 168         SEL_READY = 2
 169 };
 170
 171 enum selection_type {
 172         SEL_REGULAR = 1,
 173         SEL_RECTANGULAR = 2
 174 };
 175
 176 enum selection_snap {
 177         SNAP_WORD = 1,
 178         SNAP_LINE = 2
 179 };
 180
 181 typedef unsigned char uchar;
 182 typedef unsigned int uint;
 183 typedef unsigned long ulong;
 184 typedef unsigned short ushort;
 185
 186 typedef uint_least32_t Rune;
 187
 188 typedef XftDraw *Draw;
 189 typedef XftColor Color;
 190
 191 typedef struct {
 192         Rune u;           /* character code */
 193         ushort mode;      /* attribute flags */
 194         uint32_t fg;      /* foreground  */
 195         uint32_t bg;      /* background  */
 196 } Glyph;
 197
 198 typedef Glyph *Line;
 199
 200 typedef struct {
 201         Glyph attr; /* current char attributes */
 202         int x;
 203         int y;
 204         char state;
 205 } TCursor;
 206
 207 /* CSI Escape sequence structs */
 208 /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
 209 typedef struct {
 210         char buf[ESC_BUF_SIZ]; /* raw string */
 211         int len;               /* raw string length */
 212         char priv;
 213         int arg[ESC_ARG_SIZ];
 214         int narg;              /* nb of args */
 215         char mode[2];
 216 } CSIEscape;
 217
 218 /* STR Escape sequence structs */
 219 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 220 typedef struct {
 221         char type;             /* ESC type ... */
 222         char buf[STR_BUF_SIZ]; /* raw string */
 223         int len;               /* raw string length */
 224         char *args[STR_ARG_SIZ];
 225         int narg;              /* nb of args */
 226 } STREscape;
 227
 228 /* Internal representation of the screen */
 229 typedef struct {
 230         int row;      /* nb row */
 231         int col;      /* nb col */
 232         Line *line;   /* screen */
 233         Line *alt;    /* alternate screen */
 234         bool *dirty;  /* dirtyness of lines */
 235         XftGlyphFontSpec *specbuf; /* font spec buffer used for rendering */
 236         TCursor c;    /* cursor */
 237         int top;      /* top    scroll limit */
 238         int bot;      /* bottom scroll limit */
 239         int mode;     /* terminal mode flags */
 240         int esc;      /* escape state flags */
 241         char trantbl[4]; /* charset table translation */
 242         int charset;  /* current charset */
 243         int icharset; /* selected charset for sequence */
 244         bool numlock; /* lock numbers in keyboard */
 245         bool *tabs;
 246 } Term;
 247
 248 /* Purely graphic info */
 249 typedef struct {
 250         Display *dpy;
 251         Colormap cmap;
 252         Window win;
 253         Drawable buf;
 254         Atom xembed, wmdeletewin, netwmname, netwmpid;
 255         XIM xim;
 256         XIC xic;
 257         Draw draw;
 258         Visual *vis;
 259         XSetWindowAttributes attrs;
 260         int scr;
 261         bool isfixed; /* is fixed geometry? */
 262         int l, t; /* left and top offset */
 263         int gm; /* geometry mask */
 264         int tw, th; /* tty width and height */
 265         int w, h; /* window width and height */
 266         int ch; /* char height */
 267         int cw; /* char width  */
 268         char state; /* focus, redraw, visible */
 269         int cursor; /* cursor style */
 270 } XWindow;
 271
 272 typedef struct {
 273         uint b;
 274         uint mask;
 275         char *s;
 276 } Mousekey;
 277
 278 typedef struct {
 279         KeySym k;
 280         uint mask;
 281         char *s;
 282         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 283         signed char appkey;    /* application keypad */
 284         signed char appcursor; /* application cursor */
 285         signed char crlf;      /* crlf mode          */
 286 } Key;
 287
 288 typedef struct {
 289         int mode;
 290         int type;
 291         int snap;
 292         /*
 293          * Selection variables:
 294          * nb – normalized coordinates of the beginning of the selection
 295          * ne – normalized coordinates of the end of the selection
 296          * ob – original coordinates of the beginning of the selection
 297          * oe – original coordinates of the end of the selection
 298          */
 299         struct {
 300                 int x, y;
 301         } nb, ne, ob, oe;
 302
 303         char *primary, *clipboard;
 304         Atom xtarget;
 305         bool alt;
 306         struct timespec tclick1;
 307         struct timespec tclick2;
 308 } Selection;
 309
 310 typedef union {
 311         int i;
 312         uint ui;
 313         float f;
 314         const void *v;
 315 } Arg;
 316
 317 typedef struct {
 318         uint mod;
 319         KeySym keysym;
 320         void (*func)(const Arg *);
 321         const Arg arg;
 322 } Shortcut;
 323
 324 /* function definitions used in config.h */
 325 static void clipcopy(const Arg *);
 326 static void clippaste(const Arg *);
 327 static void numlock(const Arg *);
 328 static void selpaste(const Arg *);
 329 static void xzoom(const Arg *);
 330 static void xzoomabs(const Arg *);
 331 static void xzoomreset(const Arg *);
 332 static void printsel(const Arg *);
 333 static void printscreen(const Arg *) ;
 334 static void toggleprinter(const Arg *);
 335
 336 /* Config.h for applying patches and the configuration. */
 337 #include "config.h"
 338
 339 /* Font structure */
 340 typedef struct {
 341         int height;
 342         int width;
 343         int ascent;
 344         int descent;
 345         short lbearing;
 346         short rbearing;
 347         XftFont *match;
 348         FcFontSet *set;
 349         FcPattern *pattern;
 350 } Font;
 351
 352 /* Drawing Context */
 353 typedef struct {
 354         Color col[MAX(LEN(colorname), 256)];
 355         Font font, bfont, ifont, ibfont;
 356         GC gc;
 357 } DC;
 358
 359 static void die(const char *, ...);
 360 static void draw(void);
 361 static void redraw(void);
 362 static void drawregion(int, int, int, int);
 363 static void execsh(void);
 364 static void stty(void);
 365 static void sigchld(int);
 366 static void run(void);
 367
 368 static void csidump(void);
 369 static void csihandle(void);
 370 static void csiparse(void);
 371 static void csireset(void);
 372 static int eschandle(uchar);
 373 static void strdump(void);
 374 static void strhandle(void);
 375 static void strparse(void);
 376 static void strreset(void);
 377
 378 static int tattrset(int);
 379 static void tprinter(char *, size_t);
 380 static void tdumpsel(void);
 381 static void tdumpline(int);
 382 static void tdump(void);
 383 static void tclearregion(int, int, int, int);
 384 static void tcursor(int);
 385 static void tdeletechar(int);
 386 static void tdeleteline(int);
 387 static void tinsertblank(int);
 388 static void tinsertblankline(int);
 389 static int tlinelen(int);
 390 static void tmoveto(int, int);
 391 static void tmoveato(int, int);
 392 static void tnew(int, int);
 393 static void tnewline(int);
 394 static void tputtab(int);
 395 static void tputc(Rune);
 396 static void treset(void);
 397 static void tresize(int, int);
 398 static void tscrollup(int, int);
 399 static void tscrolldown(int, int);
 400 static void tsetattr(int *, int);
 401 static void tsetchar(Rune, Glyph *, int, int);
 402 static void tsetscroll(int, int);
 403 static void tswapscreen(void);
 404 static void tsetdirt(int, int);
 405 static void tsetdirtattr(int);
 406 static void tsetmode(bool, bool, int *, int);
 407 static void tfulldirt(void);
 408 static void techo(Rune);
 409 static void tcontrolcode(uchar );
 410 static void tdectest(char );
 411 static int32_t tdefcolor(int *, int *, int);
 412 static void tdeftran(char);
 413 static inline bool match(uint, uint);
 414 static void ttynew(void);
 415 static void ttyread(void);
 416 static void ttyresize(void);
 417 static void ttysend(char *, size_t);
 418 static void ttywrite(const char *, size_t);
 419 static void tstrsequence(uchar);
 420
 421 static inline ushort sixd_to_16bit(int);
 422 static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int, int);
 423 static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int);
 424 static void xdrawglyph(Glyph, int, int);
 425 static void xhints(void);
 426 static void xclear(int, int, int, int);
 427 static void xdrawcursor(void);
 428 static void xinit(void);
 429 static void xloadcols(void);
 430 static int xsetcolorname(int, const char *);
 431 static int xgeommasktogravity(int);
 432 static int xloadfont(Font *, FcPattern *);
 433 static void xloadfonts(char *, double);
 434 static void xsettitle(char *);
 435 static void xresettitle(void);
 436 static void xsetpointermotion(int);
 437 static void xseturgency(int);
 438 static void xsetsel(char *, Time);
 439 static void xtermclear(int, int, int, int);
 440 static void xunloadfont(Font *);
 441 static void xunloadfonts(void);
 442 static void xresize(int, int);
 443
 444 static void expose(XEvent *);
 445 static void visibility(XEvent *);
 446 static void unmap(XEvent *);
 447 static char *kmap(KeySym, uint);
 448 static void kpress(XEvent *);
 449 static void cmessage(XEvent *);
 450 static void cresize(int, int);
 451 static void resize(XEvent *);
 452 static void focus(XEvent *);
 453 static void brelease(XEvent *);
 454 static void bpress(XEvent *);
 455 static void bmotion(XEvent *);
 456 static void selnotify(XEvent *);
 457 static void selclear(XEvent *);
 458 static void selrequest(XEvent *);
 459
 460 static void selinit(void);
 461 static void selnormalize(void);
 462 static inline bool selected(int, int);
 463 static char *getsel(void);
 464 static void selcopy(Time);
 465 static void selscroll(int, int);
 466 static void selsnap(int *, int *, int);
 467 static int x2col(int);
 468 static int y2row(int);
 469 static void getbuttoninfo(XEvent *);
 470 static void mousereport(XEvent *);
 471
 472 static size_t utf8decode(char *, Rune *, size_t);
 473 static Rune utf8decodebyte(char, size_t *);
 474 static size_t utf8encode(Rune, char *);
 475 static char utf8encodebyte(Rune, size_t);
 476 static char *utf8strchr(char *s, Rune u);
 477 static size_t utf8validate(Rune *, size_t);
 478
 479 static ssize_t xwrite(int, const char *, size_t);
 480 static void *xmalloc(size_t);
 481 static void *xrealloc(void *, size_t);
 482 static char *xstrdup(char *);
 483
 484 static void usage(void);
 485
 486 static void (*handler[LASTEvent])(XEvent *) = {
 487         [KeyPress] = kpress,
 488         [ClientMessage] = cmessage,
 489         [ConfigureNotify] = resize,
 490         [VisibilityNotify] = visibility,
 491         [UnmapNotify] = unmap,
 492         [Expose] = expose,
 493         [FocusIn] = focus,
 494         [FocusOut] = focus,
 495         [MotionNotify] = bmotion,
 496         [ButtonPress] = bpress,
 497         [ButtonRelease] = brelease,
 498 /*
 499  * Uncomment if you want the selection to disappear when you select something
 500  * different in another window.
 501  */
 502 /*      [SelectionClear] = selclear, */
 503         [SelectionNotify] = selnotify,
 504         [SelectionRequest] = selrequest,
 505 };
 506
 507 /* Globals */
 508 static DC dc;
 509 static XWindow xw;
 510 static Term term;
 511 static CSIEscape csiescseq;
 512 static STREscape strescseq;
 513 static int cmdfd;
 514 static pid_t pid;
 515 static Selection sel;
 516 static int iofd = 1;
 517 static char **opt_cmd = NULL;
 518 static char *opt_io = NULL;
 519 static char *opt_title = NULL;
 520 static char *opt_embed = NULL;
 521 static char *opt_class = NULL;
 522 static char *opt_font = NULL;
 523 static char *opt_line = NULL;
 524 static int oldbutton = 3; /* button event on startup: 3 = release */
 525
 526 static char *usedfont = NULL;
 527 static double usedfontsize = 0;
 528 static double defaultfontsize = 0;
 529
 530 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 531 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 532 static Rune utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 533 static Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 534
 535 /* Font Ring Cache */
 536 enum {
 537         FRC_NORMAL,
 538         FRC_ITALIC,
 539         FRC_BOLD,
 540         FRC_ITALICBOLD
 541 };
 542
 543 typedef struct {
 544         XftFont *font;
 545         int flags;
 546         Rune unicodep;
 547 } Fontcache;
 548
 549 /* Fontcache is an array now. A new font will be appended to the array. */
 550 static Fontcache frc[16];
 551 static int frclen = 0;
 552
 553 ssize_t
 554 xwrite(int fd, const char *s, size_t len) {
 555         size_t aux = len;
 556
 557         while(len > 0) {
 558                 ssize_t r = write(fd, s, len);
 559                 if(r < 0)
 560                         return r;
 561                 len -= r;
 562                 s += r;
 563         }
 564         return aux;
 565 }
 566
 567 void *
 568 xmalloc(size_t len) {
 569         void *p = malloc(len);
 570
 571         if(!p)
 572                 die("Out of memory\n");
 573
 574         return p;
 575 }
 576
 577 void *
 578 xrealloc(void *p, size_t len) {
 579         if((p = realloc(p, len)) == NULL)
 580                 die("Out of memory\n");
 581
 582         return p;
 583 }
 584
 585 char *
 586 xstrdup(char *s) {
 587         if((s = strdup(s)) == NULL)
 588                 die("Out of memory\n");
 589
 590         return s;
 591 }
 592
 593 size_t
 594 utf8decode(char *c, Rune *u, size_t clen) {
 595         size_t i, j, len, type;
 596         Rune udecoded;
 597
 598         *u = UTF_INVALID;
 599         if(!clen)
 600                 return 0;
 601         udecoded = utf8decodebyte(c[0], &len);
 602         if(!BETWEEN(len, 1, UTF_SIZ))
 603                 return 1;
 604         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 605                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 606                 if(type != 0)
 607                         return j;
 608         }
 609         if(j < len)
 610                 return 0;
 611         *u = udecoded;
 612         utf8validate(u, len);
 613         return len;
 614 }
 615
 616 Rune
 617 utf8decodebyte(char c, size_t *i) {
 618         for(*i = 0; *i < LEN(utfmask); ++(*i))
 619                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 620                         return (uchar)c & ~utfmask[*i];
 621         return 0;
 622 }
 623
 624 size_t
 625 utf8encode(Rune u, char *c) {
 626         size_t len, i;
 627
 628         len = utf8validate(&u, 0);
 629         if(len > UTF_SIZ)
 630                 return 0;
 631         for(i = len - 1; i != 0; --i) {
 632                 c[i] = utf8encodebyte(u, 0);
 633                 u >>= 6;
 634         }
 635         c[0] = utf8encodebyte(u, len);
 636         return len;
 637 }
 638
 639 char
 640 utf8encodebyte(Rune u, size_t i) {
 641         return utfbyte[i] | (u & ~utfmask[i]);
 642 }
 643
 644 char *
 645 utf8strchr(char *s, Rune u) {
 646         Rune r;
 647         size_t i, j, len;
 648
 649         len = strlen(s);
 650         for(i = 0, j = 0; i < len; i += j) {
 651                 if(!(j = utf8decode(&s[i], &r, len - i)))
 652                         break;
 653                 if(r == u)
 654                         return &(s[i]);
 655         }
 656         return NULL;
 657 }
 658
 659 size_t
 660 utf8validate(Rune *u, size_t i) {
 661         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 662                 *u = UTF_INVALID;
 663         for(i = 1; *u > utfmax[i]; ++i)
 664                 ;
 665         return i;
 666 }
 667
 668 void
 669 selinit(void) {
 670         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 671         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 672         sel.mode = SEL_IDLE;
 673         sel.ob.x = -1;
 674         sel.primary = NULL;
 675         sel.clipboard = NULL;
 676         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 677         if(sel.xtarget == None)
 678                 sel.xtarget = XA_STRING;
 679 }
 680
 681 int
 682 x2col(int x) {
 683         x -= borderpx;
 684         x /= xw.cw;
 685
 686         return LIMIT(x, 0, term.col-1);
 687 }
 688
 689 int
 690 y2row(int y) {
 691         y -= borderpx;
 692         y /= xw.ch;
 693
 694         return LIMIT(y, 0, term.row-1);
 695 }
 696
 697 int
 698 tlinelen(int y) {
 699         int i = term.col;
 700
 701         if(term.line[y][i - 1].mode & ATTR_WRAP)
 702                 return i;
 703
 704         while(i > 0 && term.line[y][i - 1].u == ' ')
 705                 --i;
 706
 707         return i;
 708 }
 709
 710 void
 711 selnormalize(void) {
 712         int i;
 713
 714         if(sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
 715                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 716                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 717         } else {
 718                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 719                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 720         }
 721         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 722         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 723
 724         selsnap(&sel.nb.x, &sel.nb.y, -1);
 725         selsnap(&sel.ne.x, &sel.ne.y, +1);
 726
 727         /* expand selection over line breaks */
 728         if (sel.type == SEL_RECTANGULAR)
 729                 return;
 730         i = tlinelen(sel.nb.y);
 731         if (i < sel.nb.x)
 732                 sel.nb.x = i;
 733         if (tlinelen(sel.ne.y) <= sel.ne.x)
 734                 sel.ne.x = term.col - 1;
 735 }
 736
 737 bool
 738 selected(int x, int y) {
 739         if(sel.mode == SEL_EMPTY)
 740                 return false;
 741
 742         if(sel.type == SEL_RECTANGULAR)
 743                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 744                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 745
 746         return BETWEEN(y, sel.nb.y, sel.ne.y)
 747             && (y != sel.nb.y || x >= sel.nb.x)
 748             && (y != sel.ne.y || x <= sel.ne.x);
 749 }
 750
 751 void
 752 selsnap(int *x, int *y, int direction) {
 753         int newx, newy, xt, yt;
 754         bool delim, prevdelim;
 755         Glyph *gp, *prevgp;
 756
 757         switch(sel.snap) {
 758         case SNAP_WORD:
 759                 /*
 760                  * Snap around if the word wraps around at the end or
 761                  * beginning of a line.
 762                  */
 763                 prevgp = &term.line[*y][*x];
 764                 prevdelim = ISDELIM(prevgp->u);
 765                 for(;;) {
 766                         newx = *x + direction;
 767                         newy = *y;
 768                         if(!BETWEEN(newx, 0, term.col - 1)) {
 769                                 newy += direction;
 770                                 newx = (newx + term.col) % term.col;
 771                                 if (!BETWEEN(newy, 0, term.row - 1))
 772                                         break;
 773
 774                                 if(direction > 0)
 775                                         yt = *y, xt = *x;
 776                                 else
 777                                         yt = newy, xt = newx;
 778                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 779                                         break;
 780                         }
 781
 782                         if (newx >= tlinelen(newy))
 783                                 break;
 784
 785                         gp = &term.line[newy][newx];
 786                         delim = ISDELIM(gp->u);
 787                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 788                                         || (delim && gp->u != prevgp->u)))
 789                                 break;
 790
 791                         *x = newx;
 792                         *y = newy;
 793                         prevgp = gp;
 794                         prevdelim = delim;
 795                 }
 796                 break;
 797         case SNAP_LINE:
 798                 /*
 799                  * Snap around if the the previous line or the current one
 800                  * has set ATTR_WRAP at its end. Then the whole next or
 801                  * previous line will be selected.
 802                  */
 803                 *x = (direction < 0) ? 0 : term.col - 1;
 804                 if(direction < 0) {
 805                         for(; *y > 0; *y += direction) {
 806                                 if(!(term.line[*y-1][term.col-1].mode
 807                                                 & ATTR_WRAP)) {
 808                                         break;
 809                                 }
 810                         }
 811                 } else if(direction > 0) {
 812                         for(; *y < term.row-1; *y += direction) {
 813                                 if(!(term.line[*y][term.col-1].mode
 814                                                 & ATTR_WRAP)) {
 815                                         break;
 816                                 }
 817                         }
 818                 }
 819                 break;
 820         }
 821 }
 822
 823 void
 824 getbuttoninfo(XEvent *e) {
 825         int type;
 826         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 827
 828         sel.alt = IS_SET(MODE_ALTSCREEN);
 829
 830         sel.oe.x = x2col(e->xbutton.x);
 831         sel.oe.y = y2row(e->xbutton.y);
 832         selnormalize();
 833
 834         sel.type = SEL_REGULAR;
 835         for(type = 1; type < LEN(selmasks); ++type) {
 836                 if(match(selmasks[type], state)) {
 837                         sel.type = type;
 838                         break;
 839                 }
 840         }
 841 }
 842
 843 void
 844 mousereport(XEvent *e) {
 845         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 846             button = e->xbutton.button, state = e->xbutton.state,
 847             len;
 848         char buf[40];
 849         static int ox, oy;
 850
 851         /* from urxvt */
 852         if(e->xbutton.type == MotionNotify) {
 853                 if(x == ox && y == oy)
 854                         return;
 855                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 856                         return;
 857                 /* MOUSE_MOTION: no reporting if no button is pressed */
 858                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 859                         return;
 860
 861                 button = oldbutton + 32;
 862                 ox = x;
 863                 oy = y;
 864         } else {
 865                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 866                         button = 3;
 867                 } else {
 868                         button -= Button1;
 869                         if(button >= 3)
 870                                 button += 64 - 3;
 871                 }
 872                 if(e->xbutton.type == ButtonPress) {
 873                         oldbutton = button;
 874                         ox = x;
 875                         oy = y;
 876                 } else if(e->xbutton.type == ButtonRelease) {
 877                         oldbutton = 3;
 878                         /* MODE_MOUSEX10: no button release reporting */
 879                         if(IS_SET(MODE_MOUSEX10))
 880                                 return;
 881                         if (button == 64 || button == 65)
 882                                 return;
 883                 }
 884         }
 885
 886         if(!IS_SET(MODE_MOUSEX10)) {
 887                 button += ((state & ShiftMask  ) ? 4  : 0)
 888                         + ((state & Mod4Mask   ) ? 8  : 0)
 889                         + ((state & ControlMask) ? 16 : 0);
 890         }
 891
 892         if(IS_SET(MODE_MOUSESGR)) {
 893                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 894                                 button, x+1, y+1,
 895                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 896         } else if(x < 223 && y < 223) {
 897                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 898                                 32+button, 32+x+1, 32+y+1);
 899         } else {
 900                 return;
 901         }
 902
 903         ttywrite(buf, len);
 904 }
 905
 906 void
 907 bpress(XEvent *e) {
 908         struct timespec now;
 909         Mousekey *mk;
 910
 911         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 912                 mousereport(e);
 913                 return;
 914         }
 915
 916         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 917                 if(e->xbutton.button == mk->b
 918                                 && match(mk->mask, e->xbutton.state)) {
 919                         ttysend(mk->s, strlen(mk->s));
 920                         return;
 921                 }
 922         }
 923
 924         if(e->xbutton.button == Button1) {
 925                 clock_gettime(CLOCK_MONOTONIC, &now);
 926
 927                 /* Clear previous selection, logically and visually. */
 928                 selclear(NULL);
 929                 sel.mode = SEL_EMPTY;
 930                 sel.type = SEL_REGULAR;
 931                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 932                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 933
 934                 /*
 935                  * If the user clicks below predefined timeouts specific
 936                  * snapping behaviour is exposed.
 937                  */
 938                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 939                         sel.snap = SNAP_LINE;
 940                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 941                         sel.snap = SNAP_WORD;
 942                 } else {
 943                         sel.snap = 0;
 944                 }
 945                 selnormalize();
 946
 947                 if(sel.snap != 0)
 948                         sel.mode = SEL_READY;
 949                 tsetdirt(sel.nb.y, sel.ne.y);
 950                 sel.tclick2 = sel.tclick1;
 951                 sel.tclick1 = now;
 952         }
 953 }
 954
 955 char *
 956 getsel(void) {
 957         char *str, *ptr;
 958         int y, bufsize, lastx, linelen;
 959         Glyph *gp, *last;
 960
 961         if(sel.ob.x == -1)
 962                 return NULL;
 963
 964         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 965         ptr = str = xmalloc(bufsize);
 966
 967         /* append every set & selected glyph to the selection */
 968         for(y = sel.nb.y; y <= sel.ne.y; y++) {
 969                 linelen = tlinelen(y);
 970
 971                 if(sel.type == SEL_RECTANGULAR) {
 972                         gp = &term.line[y][sel.nb.x];
 973                         lastx = sel.ne.x;
 974                 } else {
 975                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 976                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 977                 }
 978                 last = &term.line[y][MIN(lastx, linelen-1)];
 979                 while(last >= gp && last->u == ' ')
 980                         --last;
 981
 982                 for( ; gp <= last; ++gp) {
 983                         if(gp->mode & ATTR_WDUMMY)
 984                                 continue;
 985
 986                         ptr += utf8encode(gp->u, ptr);
 987                 }
 988
 989                 /*
 990                  * Copy and pasting of line endings is inconsistent
 991                  * in the inconsistent terminal and GUI world.
 992                  * The best solution seems like to produce '\n' when
 993                  * something is copied from st and convert '\n' to
 994                  * '\r', when something to be pasted is received by
 995                  * st.
 996                  * FIXME: Fix the computer world.
 997                  */
 998                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 999                         *ptr++ = '\n';
1000         }
1001         *ptr = 0;
1002         return str;
1003 }
1004
1005 void
1006 selcopy(Time t) {
1007         xsetsel(getsel(), t);
1008 }
1009
1010 void
1011 selnotify(XEvent *e) {
1012         ulong nitems, ofs, rem;
1013         int format;
1014         uchar *data, *last, *repl;
1015         Atom type;
1016         XSelectionEvent *xsev;
1017
1018         ofs = 0;
1019         xsev = &e->xselection;
1020         if (xsev->property == None)
1021             return;
1022         do {
1023                 if(XGetWindowProperty(xw.dpy, xw.win, xsev->property, ofs,
1024                                         BUFSIZ/4, False, AnyPropertyType,
1025                                         &type, &format, &nitems, &rem,
1026                                         &data)) {
1027                         fprintf(stderr, "Clipboard allocation failed\n");
1028                         return;
1029                 }
1030
1031                 /*
1032                  * As seen in getsel:
1033                  * Line endings are inconsistent in the terminal and GUI world
1034                  * copy and pasting. When receiving some selection data,
1035                  * replace all '\n' with '\r'.
1036                  * FIXME: Fix the computer world.
1037                  */
1038                 repl = data;
1039                 last = data + nitems * format / 8;
1040                 while((repl = memchr(repl, '\n', last - repl))) {
1041                         *repl++ = '\r';
1042                 }
1043
1044                 if(IS_SET(MODE_BRCKTPASTE))
1045                         ttywrite("\033[200~", 6);
1046                 ttysend((char *)data, nitems * format / 8);
1047                 if(IS_SET(MODE_BRCKTPASTE))
1048                         ttywrite("\033[201~", 6);
1049                 XFree(data);
1050                 /* number of 32-bit chunks returned */
1051                 ofs += nitems * format / 32;
1052         } while(rem > 0);
1053 }
1054
1055 void
1056 selpaste(const Arg *dummy) {
1057         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1058                         xw.win, CurrentTime);
1059 }
1060
1061 void
1062 clipcopy(const Arg *dummy) {
1063         Atom clipboard;
1064
1065         if(sel.clipboard != NULL)
1066                 free(sel.clipboard);
1067
1068         if(sel.primary != NULL) {
1069                 sel.clipboard = xstrdup(sel.primary);
1070                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1071                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1072         }
1073 }
1074
1075 void
1076 clippaste(const Arg *dummy) {
1077         Atom clipboard;
1078
1079         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1080         XConvertSelection(xw.dpy, clipboard, sel.xtarget, clipboard,
1081                         xw.win, CurrentTime);
1082 }
1083
1084 void
1085 selclear(XEvent *e) {
1086         if(sel.ob.x == -1)
1087                 return;
1088         sel.mode = SEL_IDLE;
1089         sel.ob.x = -1;
1090         tsetdirt(sel.nb.y, sel.ne.y);
1091 }
1092
1093 void
1094 selrequest(XEvent *e) {
1095         XSelectionRequestEvent *xsre;
1096         XSelectionEvent xev;
1097         Atom xa_targets, string, clipboard;
1098         char *seltext;
1099
1100         xsre = (XSelectionRequestEvent *) e;
1101         xev.type = SelectionNotify;
1102         xev.requestor = xsre->requestor;
1103         xev.selection = xsre->selection;
1104         xev.target = xsre->target;
1105         xev.time = xsre->time;
1106         if (xsre->property == None)
1107                 xsre->property = xsre->target;
1108
1109         /* reject */
1110         xev.property = None;
1111
1112         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1113         if(xsre->target == xa_targets) {
1114                 /* respond with the supported type */
1115                 string = sel.xtarget;
1116                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1117                                 XA_ATOM, 32, PropModeReplace,
1118                                 (uchar *) &string, 1);
1119                 xev.property = xsre->property;
1120         } else if(xsre->target == sel.xtarget || xsre->target == XA_STRING) {
1121                 /*
1122                  * xith XA_STRING non ascii characters may be incorrect in the
1123                  * requestor. It is not our problem, use utf8.
1124                  */
1125                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1126                 if(xsre->selection == XA_PRIMARY) {
1127                         seltext = sel.primary;
1128                 } else if(xsre->selection == clipboard) {
1129                         seltext = sel.clipboard;
1130                 } else {
1131                         fprintf(stderr,
1132                                 "Unhandled clipboard selection 0x%lx\n",
1133                                 xsre->selection);
1134                         return;
1135                 }
1136                 if(seltext != NULL) {
1137                         XChangeProperty(xsre->display, xsre->requestor,
1138                                         xsre->property, xsre->target,
1139                                         8, PropModeReplace,
1140                                         (uchar *)seltext, strlen(seltext));
1141                         xev.property = xsre->property;
1142                 }
1143         }
1144
1145         /* all done, send a notification to the listener */
1146         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1147                 fprintf(stderr, "Error sending SelectionNotify event\n");
1148 }
1149
1150 void
1151 xsetsel(char *str, Time t) {
1152         free(sel.primary);
1153         sel.primary = str;
1154
1155         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
1156         if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
1157                 selclear(0);
1158 }
1159
1160 void
1161 brelease(XEvent *e) {
1162         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1163                 mousereport(e);
1164                 return;
1165         }
1166
1167         if(e->xbutton.button == Button2) {
1168                 selpaste(NULL);
1169         } else if(e->xbutton.button == Button1) {
1170                 if(sel.mode == SEL_READY) {
1171                         getbuttoninfo(e);
1172                         selcopy(e->xbutton.time);
1173                 } else
1174                         selclear(NULL);
1175                 sel.mode = SEL_IDLE;
1176                 tsetdirt(sel.nb.y, sel.ne.y);
1177         }
1178 }
1179
1180 void
1181 bmotion(XEvent *e) {
1182         int oldey, oldex, oldsby, oldsey;
1183
1184         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1185                 mousereport(e);
1186                 return;
1187         }
1188
1189         if(!sel.mode)
1190                 return;
1191
1192         sel.mode = SEL_READY;
1193         oldey = sel.oe.y;
1194         oldex = sel.oe.x;
1195         oldsby = sel.nb.y;
1196         oldsey = sel.ne.y;
1197         getbuttoninfo(e);
1198
1199         if(oldey != sel.oe.y || oldex != sel.oe.x)
1200                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1201 }
1202
1203 void
1204 die(const char *errstr, ...) {
1205         va_list ap;
1206
1207         va_start(ap, errstr);
1208         vfprintf(stderr, errstr, ap);
1209         va_end(ap);
1210         exit(1);
1211 }
1212
1213 void
1214 execsh(void) {
1215         char **args, *sh, *prog;
1216         const struct passwd *pw;
1217         char buf[sizeof(long) * 8 + 1];
1218
1219         errno = 0;
1220         if((pw = getpwuid(getuid())) == NULL) {
1221                 if(errno)
1222                         die("getpwuid:%s\n", strerror(errno));
1223                 else
1224                         die("who are you?\n");
1225         }
1226
1227         if (!(sh = getenv("SHELL"))) {
1228                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1229         }
1230
1231         if(opt_cmd)
1232                 prog = opt_cmd[0];
1233         else if(utmp)
1234                 prog = utmp;
1235         else
1236                 prog = sh;
1237         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1238
1239         snprintf(buf, sizeof(buf), "%lu", xw.win);
1240
1241         unsetenv("COLUMNS");
1242         unsetenv("LINES");
1243         unsetenv("TERMCAP");
1244         setenv("LOGNAME", pw->pw_name, 1);
1245         setenv("USER", pw->pw_name, 1);
1246         setenv("SHELL", sh, 1);
1247         setenv("HOME", pw->pw_dir, 1);
1248         setenv("TERM", termname, 1);
1249         setenv("WINDOWID", buf, 1);
1250
1251         signal(SIGCHLD, SIG_DFL);
1252         signal(SIGHUP, SIG_DFL);
1253         signal(SIGINT, SIG_DFL);
1254         signal(SIGQUIT, SIG_DFL);
1255         signal(SIGTERM, SIG_DFL);
1256         signal(SIGALRM, SIG_DFL);
1257
1258         execvp(prog, args);
1259         _exit(1);
1260 }
1261
1262 void
1263 sigchld(int a) {
1264         int stat;
1265         pid_t p;
1266
1267         if((p = waitpid(pid, &stat, WNOHANG)) < 0)
1268                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1269
1270         if(pid != p)
1271                 return;
1272
1273         if (!WIFEXITED(stat) || WEXITSTATUS(stat))
1274                 die("child finished with error '%d'\n", stat);
1275         exit(0);
1276 }
1277
1278
1279 void
1280 stty(void)
1281 {
1282         char cmd[_POSIX_ARG_MAX], **p, *q, *s;
1283         size_t n, siz;
1284
1285         if((n = strlen(stty_args)) > sizeof(cmd)-1)
1286                 die("incorrect stty parameters\n");
1287         memcpy(cmd, stty_args, n);
1288         q = cmd + n;
1289         siz = sizeof(cmd) - n;
1290         for(p = opt_cmd; p && (s = *p); ++p) {
1291                 if((n = strlen(s)) > siz-1)
1292                         die("stty parameter length too long\n");
1293                 *q++ = ' ';
1294                 q = memcpy(q, s, n);
1295                 q += n;
1296                 siz-= n + 1;
1297         }
1298         *q = '\0';
1299         if (system(cmd) != 0)
1300             perror("Couldn't call stty");
1301 }
1302
1303 void
1304 ttynew(void) {
1305         int m, s;
1306         struct winsize w = {term.row, term.col, 0, 0};
1307
1308         if(opt_io) {
1309                 term.mode |= MODE_PRINT;
1310                 iofd = (!strcmp(opt_io, "-")) ?
1311                           1 : open(opt_io, O_WRONLY | O_CREAT, 0666);
1312                 if(iofd < 0) {
1313                         fprintf(stderr, "Error opening %s:%s\n",
1314                                 opt_io, strerror(errno));
1315                 }
1316         }
1317
1318         if (opt_line) {
1319                 if((cmdfd = open(opt_line, O_RDWR)) < 0)
1320                         die("open line failed: %s\n", strerror(errno));
1321                 close(0);
1322                 dup(cmdfd);
1323                 stty();
1324                 return;
1325         }
1326
1327         /* seems to work fine on linux, openbsd and freebsd */
1328         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1329                 die("openpty failed: %s\n", strerror(errno));
1330
1331         switch(pid = fork()) {
1332         case -1:
1333                 die("fork failed\n");
1334                 break;
1335         case 0:
1336                 close(iofd);
1337                 setsid(); /* create a new process group */
1338                 dup2(s, 0);
1339                 dup2(s, 1);
1340                 dup2(s, 2);
1341                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1342                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1343                 close(s);
1344                 close(m);
1345                 execsh();
1346                 break;
1347         default:
1348                 close(s);
1349                 cmdfd = m;
1350                 signal(SIGCHLD, sigchld);
1351                 break;
1352         }
1353 }
1354
1355 void
1356 ttyread(void) {
1357         static char buf[BUFSIZ];
1358         static int buflen = 0;
1359         char *ptr;
1360         int charsize; /* size of utf8 char in bytes */
1361         Rune unicodep;
1362         int ret;
1363
1364         /* append read bytes to unprocessed bytes */
1365         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1366                 die("Couldn't read from shell: %s\n", strerror(errno));
1367
1368         /* process every complete utf8 char */
1369         buflen += ret;
1370         ptr = buf;
1371         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1372                 tputc(unicodep);
1373                 ptr += charsize;
1374                 buflen -= charsize;
1375         }
1376
1377         /* keep any uncomplete utf8 char for the next call */
1378         memmove(buf, ptr, buflen);
1379 }
1380
1381 void
1382 ttywrite(const char *s, size_t n) {
1383         if(xwrite(cmdfd, s, n) == -1)
1384                 die("write error on tty: %s\n", strerror(errno));
1385 }
1386
1387 void
1388 ttysend(char *s, size_t n) {
1389         int len;
1390         Rune u;
1391
1392         ttywrite(s, n);
1393         if(IS_SET(MODE_ECHO))
1394                 while((len = utf8decode(s, &u, n)) > 0) {
1395                         techo(u);
1396                         n -= len;
1397                         s += len;
1398                 }
1399 }
1400
1401 void
1402 ttyresize(void) {
1403         struct winsize w;
1404
1405         w.ws_row = term.row;
1406         w.ws_col = term.col;
1407         w.ws_xpixel = xw.tw;
1408         w.ws_ypixel = xw.th;
1409         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1410                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1411 }
1412
1413 int
1414 tattrset(int attr) {
1415         int i, j;
1416
1417         for(i = 0; i < term.row-1; i++) {
1418                 for(j = 0; j < term.col-1; j++) {
1419                         if(term.line[i][j].mode & attr)
1420                                 return 1;
1421                 }
1422         }
1423
1424         return 0;
1425 }
1426
1427 void
1428 tsetdirt(int top, int bot) {
1429         int i;
1430
1431         LIMIT(top, 0, term.row-1);
1432         LIMIT(bot, 0, term.row-1);
1433
1434         for(i = top; i <= bot; i++)
1435                 term.dirty[i] = 1;
1436 }
1437
1438 void
1439 tsetdirtattr(int attr) {
1440         int i, j;
1441
1442         for(i = 0; i < term.row-1; i++) {
1443                 for(j = 0; j < term.col-1; j++) {
1444                         if(term.line[i][j].mode & attr) {
1445                                 tsetdirt(i, i);
1446                                 break;
1447                         }
1448                 }
1449         }
1450 }
1451
1452 void
1453 tfulldirt(void) {
1454         tsetdirt(0, term.row-1);
1455 }
1456
1457 void
1458 tcursor(int mode) {
1459         static TCursor c[2];
1460         bool alt = IS_SET(MODE_ALTSCREEN);
1461
1462         if(mode == CURSOR_SAVE) {
1463                 c[alt] = term.c;
1464         } else if(mode == CURSOR_LOAD) {
1465                 term.c = c[alt];
1466                 tmoveto(c[alt].x, c[alt].y);
1467         }
1468 }
1469
1470 void
1471 treset(void) {
1472         uint i;
1473
1474         term.c = (TCursor){{
1475                 .mode = ATTR_NULL,
1476                 .fg = defaultfg,
1477                 .bg = defaultbg
1478         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1479
1480         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1481         for(i = tabspaces; i < term.col; i += tabspaces)
1482                 term.tabs[i] = 1;
1483         term.top = 0;
1484         term.bot = term.row - 1;
1485         term.mode = MODE_WRAP;
1486         memset(term.trantbl, CS_USA, sizeof(term.trantbl));
1487         term.charset = 0;
1488
1489         for(i = 0; i < 2; i++) {
1490                 tmoveto(0, 0);
1491                 tcursor(CURSOR_SAVE);
1492                 tclearregion(0, 0, term.col-1, term.row-1);
1493                 tswapscreen();
1494         }
1495 }
1496
1497 void
1498 tnew(int col, int row) {
1499         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1500         tresize(col, row);
1501         term.numlock = 1;
1502
1503         treset();
1504 }
1505
1506 void
1507 tswapscreen(void) {
1508         Line *tmp = term.line;
1509
1510         term.line = term.alt;
1511         term.alt = tmp;
1512         term.mode ^= MODE_ALTSCREEN;
1513         tfulldirt();
1514 }
1515
1516 void
1517 tscrolldown(int orig, int n) {
1518         int i;
1519         Line temp;
1520
1521         LIMIT(n, 0, term.bot-orig+1);
1522
1523         tsetdirt(orig, term.bot-n);
1524         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1525
1526         for(i = term.bot; i >= orig+n; i--) {
1527                 temp = term.line[i];
1528                 term.line[i] = term.line[i-n];
1529                 term.line[i-n] = temp;
1530         }
1531
1532         selscroll(orig, n);
1533 }
1534
1535 void
1536 tscrollup(int orig, int n) {
1537         int i;
1538         Line temp;
1539
1540         LIMIT(n, 0, term.bot-orig+1);
1541
1542         tclearregion(0, orig, term.col-1, orig+n-1);
1543         tsetdirt(orig+n, term.bot);
1544
1545         for(i = orig; i <= term.bot-n; i++) {
1546                 temp = term.line[i];
1547                 term.line[i] = term.line[i+n];
1548                 term.line[i+n] = temp;
1549         }
1550
1551         selscroll(orig, -n);
1552 }
1553
1554 void
1555 selscroll(int orig, int n) {
1556         if(sel.ob.x == -1)
1557                 return;
1558
1559         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1560                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1561                         selclear(NULL);
1562                         return;
1563                 }
1564                 if(sel.type == SEL_RECTANGULAR) {
1565                         if(sel.ob.y < term.top)
1566                                 sel.ob.y = term.top;
1567                         if(sel.oe.y > term.bot)
1568                                 sel.oe.y = term.bot;
1569                 } else {
1570                         if(sel.ob.y < term.top) {
1571                                 sel.ob.y = term.top;
1572                                 sel.ob.x = 0;
1573                         }
1574                         if(sel.oe.y > term.bot) {
1575                                 sel.oe.y = term.bot;
1576                                 sel.oe.x = term.col;
1577                         }
1578                 }
1579                 selnormalize();
1580         }
1581 }
1582
1583 void
1584 tnewline(int first_col) {
1585         int y = term.c.y;
1586
1587         if(y == term.bot) {
1588                 tscrollup(term.top, 1);
1589         } else {
1590                 y++;
1591         }
1592         tmoveto(first_col ? 0 : term.c.x, y);
1593 }
1594
1595 void
1596 csiparse(void) {
1597         char *p = csiescseq.buf, *np;
1598         long int v;
1599
1600         csiescseq.narg = 0;
1601         if(*p == '?') {
1602                 csiescseq.priv = 1;
1603                 p++;
1604         }
1605
1606         csiescseq.buf[csiescseq.len] = '\0';
1607         while(p < csiescseq.buf+csiescseq.len) {
1608                 np = NULL;
1609                 v = strtol(p, &np, 10);
1610                 if(np == p)
1611                         v = 0;
1612                 if(v == LONG_MAX || v == LONG_MIN)
1613                         v = -1;
1614                 csiescseq.arg[csiescseq.narg++] = v;
1615                 p = np;
1616                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1617                         break;
1618                 p++;
1619         }
1620         csiescseq.mode[0] = *p++;
1621         csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1622 }
1623
1624 /* for absolute user moves, when decom is set */
1625 void
1626 tmoveato(int x, int y) {
1627         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1628 }
1629
1630 void
1631 tmoveto(int x, int y) {
1632         int miny, maxy;
1633
1634         if(term.c.state & CURSOR_ORIGIN) {
1635                 miny = term.top;
1636                 maxy = term.bot;
1637         } else {
1638                 miny = 0;
1639                 maxy = term.row - 1;
1640         }
1641         term.c.state &= ~CURSOR_WRAPNEXT;
1642         term.c.x = LIMIT(x, 0, term.col-1);
1643         term.c.y = LIMIT(y, miny, maxy);
1644 }
1645
1646 void
1647 tsetchar(Rune u, Glyph *attr, int x, int y) {
1648         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1649                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1650                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1651                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1652                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1653                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1654                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1655                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1656                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1657         };
1658
1659         /*
1660          * The table is proudly stolen from rxvt.
1661          */
1662         if(term.trantbl[term.charset] == CS_GRAPHIC0 &&
1663            BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
1664                 utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
1665
1666         if(term.line[y][x].mode & ATTR_WIDE) {
1667                 if(x+1 < term.col) {
1668                         term.line[y][x+1].u = ' ';
1669                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1670                 }
1671         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1672                 term.line[y][x-1].u = ' ';
1673                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1674         }
1675
1676         term.dirty[y] = 1;
1677         term.line[y][x] = *attr;
1678         term.line[y][x].u = u;
1679 }
1680
1681 void
1682 tclearregion(int x1, int y1, int x2, int y2) {
1683         int x, y, temp;
1684         Glyph *gp;
1685
1686         if(x1 > x2)
1687                 temp = x1, x1 = x2, x2 = temp;
1688         if(y1 > y2)
1689                 temp = y1, y1 = y2, y2 = temp;
1690
1691         LIMIT(x1, 0, term.col-1);
1692         LIMIT(x2, 0, term.col-1);
1693         LIMIT(y1, 0, term.row-1);
1694         LIMIT(y2, 0, term.row-1);
1695
1696         for(y = y1; y <= y2; y++) {
1697                 term.dirty[y] = 1;
1698                 for(x = x1; x <= x2; x++) {
1699                         gp = &term.line[y][x];
1700                         if(selected(x, y))
1701                                 selclear(NULL);
1702                         gp->fg = term.c.attr.fg;
1703                         gp->bg = term.c.attr.bg;
1704                         gp->mode = 0;
1705                         gp->u = ' ';
1706                 }
1707         }
1708 }
1709
1710 void
1711 tdeletechar(int n) {
1712         int dst, src, size;
1713         Glyph *line;
1714
1715         LIMIT(n, 0, term.col - term.c.x);
1716
1717         dst = term.c.x;
1718         src = term.c.x + n;
1719         size = term.col - src;
1720         line = term.line[term.c.y];
1721
1722         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1723         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1724 }
1725
1726 void
1727 tinsertblank(int n) {
1728         int dst, src, size;
1729         Glyph *line;
1730
1731         LIMIT(n, 0, term.col - term.c.x);
1732
1733         dst = term.c.x + n;
1734         src = term.c.x;
1735         size = term.col - dst;
1736         line = term.line[term.c.y];
1737
1738         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1739         tclearregion(src, term.c.y, dst - 1, term.c.y);
1740 }
1741
1742 void
1743 tinsertblankline(int n) {
1744         if(BETWEEN(term.c.y, term.top, term.bot))
1745                 tscrolldown(term.c.y, n);
1746 }
1747
1748 void
1749 tdeleteline(int n) {
1750         if(BETWEEN(term.c.y, term.top, term.bot))
1751                 tscrollup(term.c.y, n);
1752 }
1753
1754 int32_t
1755 tdefcolor(int *attr, int *npar, int l) {
1756         int32_t idx = -1;
1757         uint r, g, b;
1758
1759         switch (attr[*npar + 1]) {
1760         case 2: /* direct color in RGB space */
1761                 if (*npar + 4 >= l) {
1762                         fprintf(stderr,
1763                                 "erresc(38): Incorrect number of parameters (%d)\n",
1764                                 *npar);
1765                         break;
1766                 }
1767                 r = attr[*npar + 2];
1768                 g = attr[*npar + 3];
1769                 b = attr[*npar + 4];
1770                 *npar += 4;
1771                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1772                         fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
1773                                 r, g, b);
1774                 else
1775                         idx = TRUECOLOR(r, g, b);
1776                 break;
1777         case 5: /* indexed color */
1778                 if (*npar + 2 >= l) {
1779                         fprintf(stderr,
1780                                 "erresc(38): Incorrect number of parameters (%d)\n",
1781                                 *npar);
1782                         break;
1783                 }
1784                 *npar += 2;
1785                 if(!BETWEEN(attr[*npar], 0, 255))
1786                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1787                 else
1788                         idx = attr[*npar];
1789                 break;
1790         case 0: /* implemented defined (only foreground) */
1791         case 1: /* transparent */
1792         case 3: /* direct color in CMY space */
1793         case 4: /* direct color in CMYK space */
1794         default:
1795                 fprintf(stderr,
1796                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1797                 break;
1798         }
1799
1800         return idx;
1801 }
1802
1803 void
1804 tsetattr(int *attr, int l) {
1805         int i;
1806         int32_t idx;
1807
1808         for(i = 0; i < l; i++) {
1809                 switch(attr[i]) {
1810                 case 0:
1811                         term.c.attr.mode &= ~(
1812                                 ATTR_BOLD       |
1813                                 ATTR_FAINT      |
1814                                 ATTR_ITALIC     |
1815                                 ATTR_UNDERLINE  |
1816                                 ATTR_BLINK      |
1817                                 ATTR_REVERSE    |
1818                                 ATTR_INVISIBLE  |
1819                                 ATTR_STRUCK     );
1820                         term.c.attr.fg = defaultfg;
1821                         term.c.attr.bg = defaultbg;
1822                         break;
1823                 case 1:
1824                         term.c.attr.mode |= ATTR_BOLD;
1825                         break;
1826                 case 2:
1827                         term.c.attr.mode |= ATTR_FAINT;
1828                         break;
1829                 case 3:
1830                         term.c.attr.mode |= ATTR_ITALIC;
1831                         break;
1832                 case 4:
1833                         term.c.attr.mode |= ATTR_UNDERLINE;
1834                         break;
1835                 case 5: /* slow blink */
1836                         /* FALLTHROUGH */
1837                 case 6: /* rapid blink */
1838                         term.c.attr.mode |= ATTR_BLINK;
1839                         break;
1840                 case 7:
1841                         term.c.attr.mode |= ATTR_REVERSE;
1842                         break;
1843                 case 8:
1844                         term.c.attr.mode |= ATTR_INVISIBLE;
1845                         break;
1846                 case 9:
1847                         term.c.attr.mode |= ATTR_STRUCK;
1848                         break;
1849                 case 22:
1850                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1851                         break;
1852                 case 23:
1853                         term.c.attr.mode &= ~ATTR_ITALIC;
1854                         break;
1855                 case 24:
1856                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1857                         break;
1858                 case 25:
1859                         term.c.attr.mode &= ~ATTR_BLINK;
1860                         break;
1861                 case 27:
1862                         term.c.attr.mode &= ~ATTR_REVERSE;
1863                         break;
1864                 case 28:
1865                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1866                         break;
1867                 case 29:
1868                         term.c.attr.mode &= ~ATTR_STRUCK;
1869                         break;
1870                 case 38:
1871                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1872                                 term.c.attr.fg = idx;
1873                         break;
1874                 case 39:
1875                         term.c.attr.fg = defaultfg;
1876                         break;
1877                 case 48:
1878                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1879                                 term.c.attr.bg = idx;
1880                         break;
1881                 case 49:
1882                         term.c.attr.bg = defaultbg;
1883                         break;
1884                 default:
1885                         if(BETWEEN(attr[i], 30, 37)) {
1886                                 term.c.attr.fg = attr[i] - 30;
1887                         } else if(BETWEEN(attr[i], 40, 47)) {
1888                                 term.c.attr.bg = attr[i] - 40;
1889                         } else if(BETWEEN(attr[i], 90, 97)) {
1890                                 term.c.attr.fg = attr[i] - 90 + 8;
1891                         } else if(BETWEEN(attr[i], 100, 107)) {
1892                                 term.c.attr.bg = attr[i] - 100 + 8;
1893                         } else {
1894                                 fprintf(stderr,
1895                                         "erresc(default): gfx attr %d unknown\n",
1896                                         attr[i]), csidump();
1897                         }
1898                         break;
1899                 }
1900         }
1901 }
1902
1903 void
1904 tsetscroll(int t, int b) {
1905         int temp;
1906
1907         LIMIT(t, 0, term.row-1);
1908         LIMIT(b, 0, term.row-1);
1909         if(t > b) {
1910                 temp = t;
1911                 t = b;
1912                 b = temp;
1913         }
1914         term.top = t;
1915         term.bot = b;
1916 }
1917
1918 void
1919 tsetmode(bool priv, bool set, int *args, int narg) {
1920         int *lim, mode;
1921         bool alt;
1922
1923         for(lim = args + narg; args < lim; ++args) {
1924                 if(priv) {
1925                         switch(*args) {
1926                         case 1: /* DECCKM -- Cursor key */
1927                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1928                                 break;
1929                         case 5: /* DECSCNM -- Reverse video */
1930                                 mode = term.mode;
1931                                 MODBIT(term.mode, set, MODE_REVERSE);
1932                                 if(mode != term.mode)
1933                                         redraw();
1934                                 break;
1935                         case 6: /* DECOM -- Origin */
1936                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1937                                 tmoveato(0, 0);
1938                                 break;
1939                         case 7: /* DECAWM -- Auto wrap */
1940                                 MODBIT(term.mode, set, MODE_WRAP);
1941                                 break;
1942                         case 0:  /* Error (IGNORED) */
1943                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1944                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1945                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1946                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1947                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1948                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1949                         case 42: /* DECNRCM -- National characters (IGNORED) */
1950                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1951                                 break;
1952                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1953                                 MODBIT(term.mode, !set, MODE_HIDE);
1954                                 break;
1955                         case 9:    /* X10 mouse compatibility mode */
1956                                 xsetpointermotion(0);
1957                                 MODBIT(term.mode, 0, MODE_MOUSE);
1958                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1959                                 break;
1960                         case 1000: /* 1000: report button press */
1961                                 xsetpointermotion(0);
1962                                 MODBIT(term.mode, 0, MODE_MOUSE);
1963                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1964                                 break;
1965                         case 1002: /* 1002: report motion on button press */
1966                                 xsetpointermotion(0);
1967                                 MODBIT(term.mode, 0, MODE_MOUSE);
1968                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1969                                 break;
1970                         case 1003: /* 1003: enable all mouse motions */
1971                                 xsetpointermotion(set);
1972                                 MODBIT(term.mode, 0, MODE_MOUSE);
1973                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1974                                 break;
1975                         case 1004: /* 1004: send focus events to tty */
1976                                 MODBIT(term.mode, set, MODE_FOCUS);
1977                                 break;
1978                         case 1006: /* 1006: extended reporting mode */
1979                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1980                                 break;
1981                         case 1034:
1982                                 MODBIT(term.mode, set, MODE_8BIT);
1983                                 break;
1984                         case 1049: /* swap screen & set/restore cursor as xterm */
1985                                 if (!allowaltscreen)
1986                                         break;
1987                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1988                                 /* FALLTHROUGH */
1989                         case 47: /* swap screen */
1990                         case 1047:
1991                                 if (!allowaltscreen)
1992                                         break;
1993                                 alt = IS_SET(MODE_ALTSCREEN);
1994                                 if(alt) {
1995                                         tclearregion(0, 0, term.col-1,
1996                                                         term.row-1);
1997                                 }
1998                                 if(set ^ alt) /* set is always 1 or 0 */
1999                                         tswapscreen();
2000                                 if(*args != 1049)
2001                                         break;
2002                                 /* FALLTHROUGH */
2003                         case 1048:
2004                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
2005                                 break;
2006                         case 2004: /* 2004: bracketed paste mode */
2007                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
2008                                 break;
2009                         /* Not implemented mouse modes. See comments there. */
2010                         case 1001: /* mouse highlight mode; can hang the
2011                                       terminal by design when implemented. */
2012                         case 1005: /* UTF-8 mouse mode; will confuse
2013                                       applications not supporting UTF-8
2014                                       and luit. */
2015                         case 1015: /* urxvt mangled mouse mode; incompatible
2016                                       and can be mistaken for other control
2017                                       codes. */
2018                         default:
2019                                 fprintf(stderr,
2020                                         "erresc: unknown private set/reset mode %d\n",
2021                                         *args);
2022                                 break;
2023                         }
2024                 } else {
2025                         switch(*args) {
2026                         case 0:  /* Error (IGNORED) */
2027                                 break;
2028                         case 2:  /* KAM -- keyboard action */
2029                                 MODBIT(term.mode, set, MODE_KBDLOCK);
2030                                 break;
2031                         case 4:  /* IRM -- Insertion-replacement */
2032                                 MODBIT(term.mode, set, MODE_INSERT);
2033                                 break;
2034                         case 12: /* SRM -- Send/Receive */
2035                                 MODBIT(term.mode, !set, MODE_ECHO);
2036                                 break;
2037                         case 20: /* LNM -- Linefeed/new line */
2038                                 MODBIT(term.mode, set, MODE_CRLF);
2039                                 break;
2040                         default:
2041                                 fprintf(stderr,
2042                                         "erresc: unknown set/reset mode %d\n",
2043                                         *args);
2044                                 break;
2045                         }
2046                 }
2047         }
2048 }
2049
2050 void
2051 csihandle(void) {
2052         char buf[40];
2053         int len;
2054
2055         switch(csiescseq.mode[0]) {
2056         default:
2057         unknown:
2058                 fprintf(stderr, "erresc: unknown csi ");
2059                 csidump();
2060                 /* die(""); */
2061                 break;
2062         case '@': /* ICH -- Insert <n> blank char */
2063                 DEFAULT(csiescseq.arg[0], 1);
2064                 tinsertblank(csiescseq.arg[0]);
2065                 break;
2066         case 'A': /* CUU -- Cursor <n> Up */
2067                 DEFAULT(csiescseq.arg[0], 1);
2068                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
2069                 break;
2070         case 'B': /* CUD -- Cursor <n> Down */
2071         case 'e': /* VPR --Cursor <n> Down */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
2074                 break;
2075         case 'i': /* MC -- Media Copy */
2076                 switch(csiescseq.arg[0]) {
2077                 case 0:
2078                         tdump();
2079                         break;
2080                 case 1:
2081                         tdumpline(term.c.y);
2082                         break;
2083                 case 2:
2084                         tdumpsel();
2085                         break;
2086                 case 4:
2087                         term.mode &= ~MODE_PRINT;
2088                         break;
2089                 case 5:
2090                         term.mode |= MODE_PRINT;
2091                         break;
2092                 }
2093                 break;
2094         case 'c': /* DA -- Device Attributes */
2095                 if(csiescseq.arg[0] == 0)
2096                         ttywrite(vtiden, sizeof(vtiden) - 1);
2097                 break;
2098         case 'C': /* CUF -- Cursor <n> Forward */
2099         case 'a': /* HPR -- Cursor <n> Forward */
2100                 DEFAULT(csiescseq.arg[0], 1);
2101                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
2102                 break;
2103         case 'D': /* CUB -- Cursor <n> Backward */
2104                 DEFAULT(csiescseq.arg[0], 1);
2105                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2106                 break;
2107         case 'E': /* CNL -- Cursor <n> Down and first col */
2108                 DEFAULT(csiescseq.arg[0], 1);
2109                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2110                 break;
2111         case 'F': /* CPL -- Cursor <n> Up and first col */
2112                 DEFAULT(csiescseq.arg[0], 1);
2113                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2114                 break;
2115         case 'g': /* TBC -- Tabulation clear */
2116                 switch(csiescseq.arg[0]) {
2117                 case 0: /* clear current tab stop */
2118                         term.tabs[term.c.x] = 0;
2119                         break;
2120                 case 3: /* clear all the tabs */
2121                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2122                         break;
2123                 default:
2124                         goto unknown;
2125                 }
2126                 break;
2127         case 'G': /* CHA -- Move to <col> */
2128         case '`': /* HPA */
2129                 DEFAULT(csiescseq.arg[0], 1);
2130                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2131                 break;
2132         case 'H': /* CUP -- Move to <row> <col> */
2133         case 'f': /* HVP */
2134                 DEFAULT(csiescseq.arg[0], 1);
2135                 DEFAULT(csiescseq.arg[1], 1);
2136                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2137                 break;
2138         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2139                 DEFAULT(csiescseq.arg[0], 1);
2140                 tputtab(csiescseq.arg[0]);
2141                 break;
2142         case 'J': /* ED -- Clear screen */
2143                 selclear(NULL);
2144                 switch(csiescseq.arg[0]) {
2145                 case 0: /* below */
2146                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2147                         if(term.c.y < term.row-1) {
2148                                 tclearregion(0, term.c.y+1, term.col-1,
2149                                                 term.row-1);
2150                         }
2151                         break;
2152                 case 1: /* above */
2153                         if(term.c.y > 1)
2154                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2155                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2156                         break;
2157                 case 2: /* all */
2158                         tclearregion(0, 0, term.col-1, term.row-1);
2159                         break;
2160                 default:
2161                         goto unknown;
2162                 }
2163                 break;
2164         case 'K': /* EL -- Clear line */
2165                 switch(csiescseq.arg[0]) {
2166                 case 0: /* right */
2167                         tclearregion(term.c.x, term.c.y, term.col-1,
2168                                         term.c.y);
2169                         break;
2170                 case 1: /* left */
2171                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2172                         break;
2173                 case 2: /* all */
2174                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2175                         break;
2176                 }
2177                 break;
2178         case 'S': /* SU -- Scroll <n> line up */
2179                 DEFAULT(csiescseq.arg[0], 1);
2180                 tscrollup(term.top, csiescseq.arg[0]);
2181                 break;
2182         case 'T': /* SD -- Scroll <n> line down */
2183                 DEFAULT(csiescseq.arg[0], 1);
2184                 tscrolldown(term.top, csiescseq.arg[0]);
2185                 break;
2186         case 'L': /* IL -- Insert <n> blank lines */
2187                 DEFAULT(csiescseq.arg[0], 1);
2188                 tinsertblankline(csiescseq.arg[0]);
2189                 break;
2190         case 'l': /* RM -- Reset Mode */
2191                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2192                 break;
2193         case 'M': /* DL -- Delete <n> lines */
2194                 DEFAULT(csiescseq.arg[0], 1);
2195                 tdeleteline(csiescseq.arg[0]);
2196                 break;
2197         case 'X': /* ECH -- Erase <n> char */
2198                 DEFAULT(csiescseq.arg[0], 1);
2199                 tclearregion(term.c.x, term.c.y,
2200                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2201                 break;
2202         case 'P': /* DCH -- Delete <n> char */
2203                 DEFAULT(csiescseq.arg[0], 1);
2204                 tdeletechar(csiescseq.arg[0]);
2205                 break;
2206         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2207                 DEFAULT(csiescseq.arg[0], 1);
2208                 tputtab(-csiescseq.arg[0]);
2209                 break;
2210         case 'd': /* VPA -- Move to <row> */
2211                 DEFAULT(csiescseq.arg[0], 1);
2212                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2213                 break;
2214         case 'h': /* SM -- Set terminal mode */
2215                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2216                 break;
2217         case 'm': /* SGR -- Terminal attribute (color) */
2218                 tsetattr(csiescseq.arg, csiescseq.narg);
2219                 break;
2220         case 'n': /* DSR – Device Status Report (cursor position) */
2221                 if (csiescseq.arg[0] == 6) {
2222                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2223                                         term.c.y+1, term.c.x+1);
2224                         ttywrite(buf, len);
2225                 }
2226                 break;
2227         case 'r': /* DECSTBM -- Set Scrolling Region */
2228                 if(csiescseq.priv) {
2229                         goto unknown;
2230                 } else {
2231                         DEFAULT(csiescseq.arg[0], 1);
2232                         DEFAULT(csiescseq.arg[1], term.row);
2233                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2234                         tmoveato(0, 0);
2235                 }
2236                 break;
2237         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2238                 tcursor(CURSOR_SAVE);
2239                 break;
2240         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2241                 tcursor(CURSOR_LOAD);
2242                 break;
2243         case ' ':
2244                 switch (csiescseq.mode[1]) {
2245                         case 'q': /* DECSCUSR -- Set Cursor Style */
2246                                 DEFAULT(csiescseq.arg[0], 1);
2247                                 if (!BETWEEN(csiescseq.arg[0], 0, 6)) {
2248                                         goto unknown;
2249                                 }
2250                                 xw.cursor = csiescseq.arg[0];
2251                                 break;
2252                         default:
2253                                 goto unknown;
2254                 }
2255                 break;
2256         }
2257 }
2258
2259 void
2260 csidump(void) {
2261         int i;
2262         uint c;
2263
2264         printf("ESC[");
2265         for(i = 0; i < csiescseq.len; i++) {
2266                 c = csiescseq.buf[i] & 0xff;
2267                 if(isprint(c)) {
2268                         putchar(c);
2269                 } else if(c == '\n') {
2270                         printf("(\\n)");
2271                 } else if(c == '\r') {
2272                         printf("(\\r)");
2273                 } else if(c == 0x1b) {
2274                         printf("(\\e)");
2275                 } else {
2276                         printf("(%02x)", c);
2277                 }
2278         }
2279         putchar('\n');
2280 }
2281
2282 void
2283 csireset(void) {
2284         memset(&csiescseq, 0, sizeof(csiescseq));
2285 }
2286
2287 void
2288 strhandle(void) {
2289         char *p = NULL;
2290         int j, narg, par;
2291
2292         term.esc &= ~(ESC_STR_END|ESC_STR);
2293         strparse();
2294         par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;
2295
2296         switch(strescseq.type) {
2297         case ']': /* OSC -- Operating System Command */
2298                 switch(par) {
2299                 case 0:
2300                 case 1:
2301                 case 2:
2302                         if(narg > 1)
2303                                 xsettitle(strescseq.args[1]);
2304                         return;
2305                 case 4: /* color set */
2306                         if(narg < 3)
2307                                 break;
2308                         p = strescseq.args[2];
2309                         /* FALLTHROUGH */
2310                 case 104: /* color reset, here p = NULL */
2311                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2312                         if(xsetcolorname(j, p)) {
2313                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2314                         } else {
2315                                 /*
2316                                  * TODO if defaultbg color is changed, borders
2317                                  * are dirty
2318                                  */
2319                                 redraw();
2320                         }
2321                         return;
2322                 }
2323                 break;
2324         case 'k': /* old title set compatibility */
2325                 xsettitle(strescseq.args[0]);
2326                 return;
2327         case 'P': /* DCS -- Device Control String */
2328         case '_': /* APC -- Application Program Command */
2329         case '^': /* PM -- Privacy Message */
2330                 return;
2331         }
2332
2333         fprintf(stderr, "erresc: unknown str ");
2334         strdump();
2335 }
2336
2337 void
2338 strparse(void) {
2339         int c;
2340         char *p = strescseq.buf;
2341
2342         strescseq.narg = 0;
2343         strescseq.buf[strescseq.len] = '\0';
2344
2345         if(*p == '\0')
2346                 return;
2347
2348         while(strescseq.narg < STR_ARG_SIZ) {
2349                 strescseq.args[strescseq.narg++] = p;
2350                 while((c = *p) != ';' && c != '\0')
2351                         ++p;
2352                 if(c == '\0')
2353                         return;
2354                 *p++ = '\0';
2355         }
2356 }
2357
2358 void
2359 strdump(void) {
2360         int i;
2361         uint c;
2362
2363         printf("ESC%c", strescseq.type);
2364         for(i = 0; i < strescseq.len; i++) {
2365                 c = strescseq.buf[i] & 0xff;
2366                 if(c == '\0') {
2367                         return;
2368                 } else if(isprint(c)) {
2369                         putchar(c);
2370                 } else if(c == '\n') {
2371                         printf("(\\n)");
2372                 } else if(c == '\r') {
2373                         printf("(\\r)");
2374                 } else if(c == 0x1b) {
2375                         printf("(\\e)");
2376                 } else {
2377                         printf("(%02x)", c);
2378                 }
2379         }
2380         printf("ESC\\\n");
2381 }
2382
2383 void
2384 strreset(void) {
2385         memset(&strescseq, 0, sizeof(strescseq));
2386 }
2387
2388 void
2389 tprinter(char *s, size_t len) {
2390         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2391                 fprintf(stderr, "Error writing in %s:%s\n",
2392                         opt_io, strerror(errno));
2393                 close(iofd);
2394                 iofd = -1;
2395         }
2396 }
2397
2398 void
2399 toggleprinter(const Arg *arg) {
2400         term.mode ^= MODE_PRINT;
2401 }
2402
2403 void
2404 printscreen(const Arg *arg) {
2405         tdump();
2406 }
2407
2408 void
2409 printsel(const Arg *arg) {
2410         tdumpsel();
2411 }
2412
2413 void
2414 tdumpsel(void) {
2415         char *ptr;
2416
2417         if((ptr = getsel())) {
2418                 tprinter(ptr, strlen(ptr));
2419                 free(ptr);
2420         }
2421 }
2422
2423 void
2424 tdumpline(int n) {
2425         char buf[UTF_SIZ];
2426         Glyph *bp, *end;
2427
2428         bp = &term.line[n][0];
2429         end = &bp[MIN(tlinelen(n), term.col) - 1];
2430         if(bp != end || bp->u != ' ') {
2431                 for( ;bp <= end; ++bp)
2432                         tprinter(buf, utf8encode(bp->u, buf));
2433         }
2434         tprinter("\n", 1);
2435 }
2436
2437 void
2438 tdump(void) {
2439         int i;
2440
2441         for(i = 0; i < term.row; ++i)
2442                 tdumpline(i);
2443 }
2444
2445 void
2446 tputtab(int n) {
2447         uint x = term.c.x;
2448
2449         if(n > 0) {
2450                 while(x < term.col && n--)
2451                         for(++x; x < term.col && !term.tabs[x]; ++x)
2452                                 /* nothing */ ;
2453         } else if(n < 0) {
2454                 while(x > 0 && n++)
2455                         for(--x; x > 0 && !term.tabs[x]; --x)
2456                                 /* nothing */ ;
2457         }
2458         term.c.x = LIMIT(x, 0, term.col-1);
2459 }
2460
2461 void
2462 techo(Rune u) {
2463         if(ISCONTROL(u)) { /* control code */
2464                 if(u & 0x80) {
2465                         u &= 0x7f;
2466                         tputc('^');
2467                         tputc('[');
2468                 } else if(u != '\n' && u != '\r' && u != '\t') {
2469                         u ^= 0x40;
2470                         tputc('^');
2471                 }
2472         }
2473         tputc(u);
2474 }
2475
2476 void
2477 tdeftran(char ascii) {
2478         static char cs[] = "0B";
2479         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2480         char *p;
2481
2482         if((p = strchr(cs, ascii)) == NULL) {
2483                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2484         } else {
2485                 term.trantbl[term.icharset] = vcs[p - cs];
2486         }
2487 }
2488
2489 void
2490 tdectest(char c) {
2491         int x, y;
2492
2493         if(c == '8') { /* DEC screen alignment test. */
2494                 for(x = 0; x < term.col; ++x) {
2495                         for(y = 0; y < term.row; ++y)
2496                                 tsetchar('E', &term.c.attr, x, y);
2497                 }
2498         }
2499 }
2500
2501 void
2502 tstrsequence(uchar c) {
2503         switch (c) {
2504         case 0x90:   /* DCS -- Device Control String */
2505                 c = 'P';
2506                 break;
2507         case 0x9f:   /* APC -- Application Program Command */
2508                 c = '_';
2509                 break;
2510         case 0x9e:   /* PM -- Privacy Message */
2511                 c = '^';
2512                 break;
2513         case 0x9d:   /* OSC -- Operating System Command */
2514                 c = ']';
2515                 break;
2516         }
2517         strreset();
2518         strescseq.type = c;
2519         term.esc |= ESC_STR;
2520 }
2521
2522 void
2523 tcontrolcode(uchar ascii) {
2524         switch(ascii) {
2525         case '\t':   /* HT */
2526                 tputtab(1);
2527                 return;
2528         case '\b':   /* BS */
2529                 tmoveto(term.c.x-1, term.c.y);
2530                 return;
2531         case '\r':   /* CR */
2532                 tmoveto(0, term.c.y);
2533                 return;
2534         case '\f':   /* LF */
2535         case '\v':   /* VT */
2536         case '\n':   /* LF */
2537                 /* go to first col if the mode is set */
2538                 tnewline(IS_SET(MODE_CRLF));
2539                 return;
2540         case '\a':   /* BEL */
2541                 if(term.esc & ESC_STR_END) {
2542                         /* backwards compatibility to xterm */
2543                         strhandle();
2544                 } else {
2545                         if(!(xw.state & WIN_FOCUSED))
2546                                 xseturgency(1);
2547                         if (bellvolume)
2548                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2549                 }
2550                 break;
2551         case '\033': /* ESC */
2552                 csireset();
2553                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2554                 term.esc |= ESC_START;
2555                 return;
2556         case '\016': /* SO (LS1 -- Locking shift 1) */
2557         case '\017': /* SI (LS0 -- Locking shift 0) */
2558                 term.charset = 1 - (ascii - '\016');
2559                 return;
2560         case '\032': /* SUB */
2561                 tsetchar('?', &term.c.attr, term.c.x, term.c.y);
2562         case '\030': /* CAN */
2563                 csireset();
2564                 break;
2565         case '\005': /* ENQ (IGNORED) */
2566         case '\000': /* NUL (IGNORED) */
2567         case '\021': /* XON (IGNORED) */
2568         case '\023': /* XOFF (IGNORED) */
2569         case 0177:   /* DEL (IGNORED) */
2570                 return;
2571         case 0x84:   /* TODO: IND */
2572                 break;
2573         case 0x85:   /* NEL -- Next line */
2574                 tnewline(1); /* always go to first col */
2575                 break;
2576         case 0x88:   /* HTS -- Horizontal tab stop */
2577                 term.tabs[term.c.x] = 1;
2578                 break;
2579         case 0x8d:   /* TODO: RI */
2580         case 0x8e:   /* TODO: SS2 */
2581         case 0x8f:   /* TODO: SS3 */
2582         case 0x98:   /* TODO: SOS */
2583                 break;
2584         case 0x9a:   /* DECID -- Identify Terminal */
2585                 ttywrite(vtiden, sizeof(vtiden) - 1);
2586                 break;
2587         case 0x9b:   /* TODO: CSI */
2588         case 0x9c:   /* TODO: ST */
2589                 break;
2590         case 0x90:   /* DCS -- Device Control String */
2591         case 0x9f:   /* APC -- Application Program Command */
2592         case 0x9e:   /* PM -- Privacy Message */
2593         case 0x9d:   /* OSC -- Operating System Command */
2594                 tstrsequence(ascii);
2595                 return;
2596         }
2597         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2598         term.esc &= ~(ESC_STR_END|ESC_STR);
2599 }
2600
2601 /*
2602  * returns 1 when the sequence is finished and it hasn't to read
2603  * more characters for this sequence, otherwise 0
2604  */
2605 int
2606 eschandle(uchar ascii) {
2607         switch(ascii) {
2608         case '[':
2609                 term.esc |= ESC_CSI;
2610                 return 0;
2611         case '#':
2612                 term.esc |= ESC_TEST;
2613                 return 0;
2614         case 'P': /* DCS -- Device Control String */
2615         case '_': /* APC -- Application Program Command */
2616         case '^': /* PM -- Privacy Message */
2617         case ']': /* OSC -- Operating System Command */
2618         case 'k': /* old title set compatibility */
2619                 tstrsequence(ascii);
2620                 return 0;
2621         case 'n': /* LS2 -- Locking shift 2 */
2622         case 'o': /* LS3 -- Locking shift 3 */
2623                 term.charset = 2 + (ascii - 'n');
2624                 break;
2625         case '(': /* GZD4 -- set primary charset G0 */
2626         case ')': /* G1D4 -- set secondary charset G1 */
2627         case '*': /* G2D4 -- set tertiary charset G2 */
2628         case '+': /* G3D4 -- set quaternary charset G3 */
2629                 term.icharset = ascii - '(';
2630                 term.esc |= ESC_ALTCHARSET;
2631                 return 0;
2632         case 'D': /* IND -- Linefeed */
2633                 if(term.c.y == term.bot) {
2634                         tscrollup(term.top, 1);
2635                 } else {
2636                         tmoveto(term.c.x, term.c.y+1);
2637                 }
2638                 break;
2639         case 'E': /* NEL -- Next line */
2640                 tnewline(1); /* always go to first col */
2641                 break;
2642         case 'H': /* HTS -- Horizontal tab stop */
2643                 term.tabs[term.c.x] = 1;
2644                 break;
2645         case 'M': /* RI -- Reverse index */
2646                 if(term.c.y == term.top) {
2647                         tscrolldown(term.top, 1);
2648                 } else {
2649                         tmoveto(term.c.x, term.c.y-1);
2650                 }
2651                 break;
2652         case 'Z': /* DECID -- Identify Terminal */
2653                 ttywrite(vtiden, sizeof(vtiden) - 1);
2654                 break;
2655         case 'c': /* RIS -- Reset to inital state */
2656                 treset();
2657                 xresettitle();
2658                 xloadcols();
2659                 break;
2660         case '=': /* DECPAM -- Application keypad */
2661                 term.mode |= MODE_APPKEYPAD;
2662                 break;
2663         case '>': /* DECPNM -- Normal keypad */
2664                 term.mode &= ~MODE_APPKEYPAD;
2665                 break;
2666         case '7': /* DECSC -- Save Cursor */
2667                 tcursor(CURSOR_SAVE);
2668                 break;
2669         case '8': /* DECRC -- Restore Cursor */
2670                 tcursor(CURSOR_LOAD);
2671                 break;
2672         case '\\': /* ST -- String Terminator */
2673                 if(term.esc & ESC_STR_END)
2674                         strhandle();
2675                 break;
2676         default:
2677                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2678                         (uchar) ascii, isprint(ascii)? ascii:'.');
2679                 break;
2680         }
2681         return 1;
2682 }
2683
2684 void
2685 tputc(Rune u) {
2686         char c[UTF_SIZ];
2687         bool control;
2688         int width, len;
2689         Glyph *gp;
2690
2691         len = utf8encode(u, c);
2692         if((width = wcwidth(u)) == -1) {
2693                 memcpy(c, "\357\277\275", 4); /* UTF_INVALID */
2694                 width = 1;
2695         }
2696
2697         if(IS_SET(MODE_PRINT))
2698                 tprinter(c, len);
2699         control = ISCONTROL(u);
2700
2701         /*
2702          * STR sequence must be checked before anything else
2703          * because it uses all following characters until it
2704          * receives a ESC, a SUB, a ST or any other C1 control
2705          * character.
2706          */
2707         if(term.esc & ESC_STR) {
2708                 if(u == '\a' || u == 030 || u == 032 || u == 033 ||
2709                    ISCONTROLC1(u)) {
2710                         term.esc &= ~(ESC_START|ESC_STR);
2711                         term.esc |= ESC_STR_END;
2712                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2713                         memmove(&strescseq.buf[strescseq.len], c, len);
2714                         strescseq.len += len;
2715                         return;
2716                 } else {
2717                 /*
2718                  * Here is a bug in terminals. If the user never sends
2719                  * some code to stop the str or esc command, then st
2720                  * will stop responding. But this is better than
2721                  * silently failing with unknown characters. At least
2722                  * then users will report back.
2723                  *
2724                  * In the case users ever get fixed, here is the code:
2725                  */
2726                 /*
2727                  * term.esc = 0;
2728                  * strhandle();
2729                  */
2730                         return;
2731                 }
2732         }
2733
2734         /*
2735          * Actions of control codes must be performed as soon they arrive
2736          * because they can be embedded inside a control sequence, and
2737          * they must not cause conflicts with sequences.
2738          */
2739         if(control) {
2740                 tcontrolcode(u);
2741                 /*
2742                  * control codes are not shown ever
2743                  */
2744                 return;
2745         } else if(term.esc & ESC_START) {
2746                 if(term.esc & ESC_CSI) {
2747                         csiescseq.buf[csiescseq.len++] = u;
2748                         if(BETWEEN(u, 0x40, 0x7E)
2749                                         || csiescseq.len >= \
2750                                         sizeof(csiescseq.buf)-1) {
2751                                 term.esc = 0;
2752                                 csiparse();
2753                                 csihandle();
2754                         }
2755                         return;
2756                 } else if(term.esc & ESC_ALTCHARSET) {
2757                         tdeftran(u);
2758                 } else if(term.esc & ESC_TEST) {
2759                         tdectest(u);
2760                 } else {
2761                         if (!eschandle(u))
2762                                 return;
2763                         /* sequence already finished */
2764                 }
2765                 term.esc = 0;
2766                 /*
2767                  * All characters which form part of a sequence are not
2768                  * printed
2769                  */
2770                 return;
2771         }
2772         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2773                 selclear(NULL);
2774
2775         gp = &term.line[term.c.y][term.c.x];
2776         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2777                 gp->mode |= ATTR_WRAP;
2778                 tnewline(1);
2779                 gp = &term.line[term.c.y][term.c.x];
2780         }
2781
2782         if(IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2783                 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2784
2785         if(term.c.x+width > term.col) {
2786                 tnewline(1);
2787                 gp = &term.line[term.c.y][term.c.x];
2788         }
2789
2790         tsetchar(u, &term.c.attr, term.c.x, term.c.y);
2791
2792         if(width == 2) {
2793                 gp->mode |= ATTR_WIDE;
2794                 if(term.c.x+1 < term.col) {
2795                         gp[1].u = '\0';
2796                         gp[1].mode = ATTR_WDUMMY;
2797                 }
2798         }
2799         if(term.c.x+width < term.col) {
2800                 tmoveto(term.c.x+width, term.c.y);
2801         } else {
2802                 term.c.state |= CURSOR_WRAPNEXT;
2803         }
2804 }
2805
2806 void
2807 tresize(int col, int row) {
2808         int i;
2809         int minrow = MIN(row, term.row);
2810         int mincol = MIN(col, term.col);
2811         bool *bp;
2812         TCursor c;
2813
2814         if(col < 1 || row < 1) {
2815                 fprintf(stderr,
2816                         "tresize: error resizing to %dx%d\n", col, row);
2817                 return;
2818         }
2819
2820         /*
2821          * slide screen to keep cursor where we expect it -
2822          * tscrollup would work here, but we can optimize to
2823          * memmove because we're freeing the earlier lines
2824          */
2825         for(i = 0; i <= term.c.y - row; i++) {
2826                 free(term.line[i]);
2827                 free(term.alt[i]);
2828         }
2829         /* ensure that both src and dst are not NULL */
2830         if (i > 0) {
2831                 memmove(term.line, term.line + i, row * sizeof(Line));
2832                 memmove(term.alt, term.alt + i, row * sizeof(Line));
2833         }
2834         for(i += row; i < term.row; i++) {
2835                 free(term.line[i]);
2836                 free(term.alt[i]);
2837         }
2838
2839         /* resize to new width */
2840         term.specbuf = xrealloc(term.specbuf, col * sizeof(XftGlyphFontSpec));
2841
2842         /* resize to new height */
2843         term.line = xrealloc(term.line, row * sizeof(Line));
2844         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2845         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2846         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2847
2848         /* resize each row to new width, zero-pad if needed */
2849         for(i = 0; i < minrow; i++) {
2850                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2851                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2852         }
2853
2854         /* allocate any new rows */
2855         for(/* i == minrow */; i < row; i++) {
2856                 term.line[i] = xmalloc(col * sizeof(Glyph));
2857                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2858         }
2859         if(col > term.col) {
2860                 bp = term.tabs + term.col;
2861
2862                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2863                 while(--bp > term.tabs && !*bp)
2864                         /* nothing */ ;
2865                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2866                         *bp = 1;
2867         }
2868         /* update terminal size */
2869         term.col = col;
2870         term.row = row;
2871         /* reset scrolling region */
2872         tsetscroll(0, row-1);
2873         /* make use of the LIMIT in tmoveto */
2874         tmoveto(term.c.x, term.c.y);
2875         /* Clearing both screens (it makes dirty all lines) */
2876         c = term.c;
2877         for(i = 0; i < 2; i++) {
2878                 if(mincol < col && 0 < minrow) {
2879                         tclearregion(mincol, 0, col - 1, minrow - 1);
2880                 }
2881                 if(0 < col && minrow < row) {
2882                         tclearregion(0, minrow, col - 1, row - 1);
2883                 }
2884                 tswapscreen();
2885                 tcursor(CURSOR_LOAD);
2886         }
2887         term.c = c;
2888 }
2889
2890 void
2891 xresize(int col, int row) {
2892         xw.tw = MAX(1, col * xw.cw);
2893         xw.th = MAX(1, row * xw.ch);
2894
2895         XFreePixmap(xw.dpy, xw.buf);
2896         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2897                         DefaultDepth(xw.dpy, xw.scr));
2898         XftDrawChange(xw.draw, xw.buf);
2899         xclear(0, 0, xw.w, xw.h);
2900 }
2901
2902 ushort
2903 sixd_to_16bit(int x) {
2904         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2905 }
2906
2907 bool
2908 xloadcolor(int i, const char *name, Color *ncolor) {
2909         XRenderColor color = { .alpha = 0xffff };
2910
2911         if(!name) {
2912                 if(BETWEEN(i, 16, 255)) { /* 256 color */
2913                         if(i < 6*6*6+16) { /* same colors as xterm */
2914                                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2915                                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2916                                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2917                         } else { /* greyscale */
2918                                 color.red = 0x0808 + 0x0a0a * (i - (6*6*6+16));
2919                                 color.green = color.blue = color.red;
2920                         }
2921                         return XftColorAllocValue(xw.dpy, xw.vis,
2922                                                   xw.cmap, &color, ncolor);
2923                 } else
2924                         name = colorname[i];
2925         }
2926         return XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, ncolor);
2927 }
2928
2929 void
2930 xloadcols(void) {
2931         int i;
2932         static bool loaded;
2933         Color *cp;
2934
2935         if(loaded) {
2936                 for (cp = dc.col; cp < &dc.col[LEN(dc.col)]; ++cp)
2937                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2938         }
2939
2940         for(i = 0; i < LEN(dc.col); i++)
2941                 if(!xloadcolor(i, NULL, &dc.col[i])) {
2942                         if(colorname[i])
2943                                 die("Could not allocate color '%s'\n", colorname[i]);
2944                         else
2945                                 die("Could not allocate color %d\n", i);
2946                 }
2947         loaded = true;
2948 }
2949
2950 int
2951 xsetcolorname(int x, const char *name) {
2952         Color ncolor;
2953
2954         if(!BETWEEN(x, 0, LEN(dc.col)))
2955                 return 1;
2956
2957
2958         if(!xloadcolor(x, name, &ncolor))
2959                 return 1;
2960
2961         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2962         dc.col[x] = ncolor;
2963         return 0;
2964 }
2965
2966 void
2967 xtermclear(int col1, int row1, int col2, int row2) {
2968         XftDrawRect(xw.draw,
2969                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2970                         borderpx + col1 * xw.cw,
2971                         borderpx + row1 * xw.ch,
2972                         (col2-col1+1) * xw.cw,
2973                         (row2-row1+1) * xw.ch);
2974 }
2975
2976 /*
2977  * Absolute coordinates.
2978  */
2979 void
2980 xclear(int x1, int y1, int x2, int y2) {
2981         XftDrawRect(xw.draw,
2982                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2983                         x1, y1, x2-x1, y2-y1);
2984 }
2985
2986 void
2987 xhints(void) {
2988         XClassHint class = {opt_class ? opt_class : termname, termname};
2989         XWMHints wm = {.flags = InputHint, .input = 1};
2990         XSizeHints *sizeh = NULL;
2991
2992         sizeh = XAllocSizeHints();
2993
2994         sizeh->flags = PSize | PResizeInc | PBaseSize;
2995         sizeh->height = xw.h;
2996         sizeh->width = xw.w;
2997         sizeh->height_inc = xw.ch;
2998         sizeh->width_inc = xw.cw;
2999         sizeh->base_height = 2 * borderpx;
3000         sizeh->base_width = 2 * borderpx;
3001         if(xw.isfixed == True) {
3002                 sizeh->flags |= PMaxSize | PMinSize;
3003                 sizeh->min_width = sizeh->max_width = xw.w;
3004                 sizeh->min_height = sizeh->max_height = xw.h;
3005         }
3006         if(xw.gm & (XValue|YValue)) {
3007                 sizeh->flags |= USPosition | PWinGravity;
3008                 sizeh->x = xw.l;
3009                 sizeh->y = xw.t;
3010                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
3011         }
3012
3013         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
3014                         &class);
3015         XFree(sizeh);
3016 }
3017
3018 int
3019 xgeommasktogravity(int mask) {
3020         switch(mask & (XNegative|YNegative)) {
3021         case 0:
3022                 return NorthWestGravity;
3023         case XNegative:
3024                 return NorthEastGravity;
3025         case YNegative:
3026                 return SouthWestGravity;
3027         }
3028         return SouthEastGravity;
3029 }
3030
3031 int
3032 xloadfont(Font *f, FcPattern *pattern) {
3033         FcPattern *match;
3034         FcResult result;
3035
3036         match = FcFontMatch(NULL, pattern, &result);
3037         if(!match)
3038                 return 1;
3039
3040         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
3041                 FcPatternDestroy(match);
3042                 return 1;
3043         }
3044
3045         f->set = NULL;
3046         f->pattern = FcPatternDuplicate(pattern);
3047
3048         f->ascent = f->match->ascent;
3049         f->descent = f->match->descent;
3050         f->lbearing = 0;
3051         f->rbearing = f->match->max_advance_width;
3052
3053         f->height = f->ascent + f->descent;
3054         f->width = f->lbearing + f->rbearing;
3055
3056         return 0;
3057 }
3058
3059 void
3060 xloadfonts(char *fontstr, double fontsize) {
3061         FcPattern *pattern;
3062         double fontval;
3063         float ceilf(float);
3064
3065         if(fontstr[0] == '-') {
3066                 pattern = XftXlfdParse(fontstr, False, False);
3067         } else {
3068                 pattern = FcNameParse((FcChar8 *)fontstr);
3069         }
3070
3071         if(!pattern)
3072                 die("st: can't open font %s\n", fontstr);
3073
3074         if(fontsize > 1) {
3075                 FcPatternDel(pattern, FC_PIXEL_SIZE);
3076                 FcPatternDel(pattern, FC_SIZE);
3077                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
3078                 usedfontsize = fontsize;
3079         } else {
3080                 if(FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval) ==
3081                                 FcResultMatch) {
3082                         usedfontsize = fontval;
3083                 } else if(FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval) ==
3084                                 FcResultMatch) {
3085                         usedfontsize = -1;
3086                 } else {
3087                         /*
3088                          * Default font size is 12, if none given. This is to
3089                          * have a known usedfontsize value.
3090                          */
3091                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3092                         usedfontsize = 12;
3093                 }
3094                 defaultfontsize = usedfontsize;
3095         }
3096
3097         FcConfigSubstitute(0, pattern, FcMatchPattern);
3098         FcDefaultSubstitute(pattern);
3099
3100         if(xloadfont(&dc.font, pattern))
3101                 die("st: can't open font %s\n", fontstr);
3102
3103         if(usedfontsize < 0) {
3104                 FcPatternGetDouble(dc.font.match->pattern,
3105                                    FC_PIXEL_SIZE, 0, &fontval);
3106                 usedfontsize = fontval;
3107                 if(fontsize == 0)
3108                         defaultfontsize = fontval;
3109         }
3110
3111         /* Setting character width and height. */
3112         xw.cw = ceilf(dc.font.width * cwscale);
3113         xw.ch = ceilf(dc.font.height * chscale);
3114
3115         FcPatternDel(pattern, FC_SLANT);
3116         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3117         if(xloadfont(&dc.ifont, pattern))
3118                 die("st: can't open font %s\n", fontstr);
3119
3120         FcPatternDel(pattern, FC_WEIGHT);
3121         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3122         if(xloadfont(&dc.ibfont, pattern))
3123                 die("st: can't open font %s\n", fontstr);
3124
3125         FcPatternDel(pattern, FC_SLANT);
3126         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3127         if(xloadfont(&dc.bfont, pattern))
3128                 die("st: can't open font %s\n", fontstr);
3129
3130         FcPatternDestroy(pattern);
3131 }
3132
3133 void
3134 xunloadfont(Font *f) {
3135         XftFontClose(xw.dpy, f->match);
3136         FcPatternDestroy(f->pattern);
3137         if(f->set)
3138                 FcFontSetDestroy(f->set);
3139 }
3140
3141 void
3142 xunloadfonts(void) {
3143         /* Free the loaded fonts in the font cache.  */
3144         while(frclen > 0)
3145                 XftFontClose(xw.dpy, frc[--frclen].font);
3146
3147         xunloadfont(&dc.font);
3148         xunloadfont(&dc.bfont);
3149         xunloadfont(&dc.ifont);
3150         xunloadfont(&dc.ibfont);
3151 }
3152
3153 void
3154 xzoom(const Arg *arg) {
3155         Arg larg;
3156
3157         larg.f = usedfontsize + arg->f;
3158         xzoomabs(&larg);
3159 }
3160
3161 void
3162 xzoomabs(const Arg *arg) {
3163         xunloadfonts();
3164         xloadfonts(usedfont, arg->f);
3165         cresize(0, 0);
3166         redraw();
3167         xhints();
3168 }
3169
3170 void
3171 xzoomreset(const Arg *arg) {
3172         Arg larg;
3173
3174         if(defaultfontsize > 0) {
3175                 larg.f = defaultfontsize;
3176                 xzoomabs(&larg);
3177         }
3178 }
3179
3180 void
3181 xinit(void) {
3182         XGCValues gcvalues;
3183         Cursor cursor;
3184         Window parent;
3185         pid_t thispid = getpid();
3186
3187         if(!(xw.dpy = XOpenDisplay(NULL)))
3188                 die("Can't open display\n");
3189         xw.scr = XDefaultScreen(xw.dpy);
3190         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3191
3192         /* font */
3193         if(!FcInit())
3194                 die("Could not init fontconfig.\n");
3195
3196         usedfont = (opt_font == NULL)? font : opt_font;
3197         xloadfonts(usedfont, 0);
3198
3199         /* colors */
3200         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3201         xloadcols();
3202
3203         /* adjust fixed window geometry */
3204         xw.w = 2 * borderpx + term.col * xw.cw;
3205         xw.h = 2 * borderpx + term.row * xw.ch;
3206         if(xw.gm & XNegative)
3207                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3208         if(xw.gm & YNegative)
3209                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3210
3211         /* Events */
3212         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3213         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3214         xw.attrs.bit_gravity = NorthWestGravity;
3215         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3216                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3217                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3218         xw.attrs.colormap = xw.cmap;
3219
3220         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3221                 parent = XRootWindow(xw.dpy, xw.scr);
3222         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3223                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3224                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3225                         | CWEventMask | CWColormap, &xw.attrs);
3226
3227         memset(&gcvalues, 0, sizeof(gcvalues));
3228         gcvalues.graphics_exposures = False;
3229         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3230                         &gcvalues);
3231         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3232                         DefaultDepth(xw.dpy, xw.scr));
3233         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3234         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3235
3236         /* Xft rendering context */
3237         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3238
3239         /* input methods */
3240         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3241                 XSetLocaleModifiers("@im=local");
3242                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3243                         XSetLocaleModifiers("@im=");
3244                         if((xw.xim = XOpenIM(xw.dpy,
3245                                         NULL, NULL, NULL)) == NULL) {
3246                                 die("XOpenIM failed. Could not open input"
3247                                         " device.\n");
3248                         }
3249                 }
3250         }
3251         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3252                                            | XIMStatusNothing, XNClientWindow, xw.win,
3253                                            XNFocusWindow, xw.win, NULL);
3254         if(xw.xic == NULL)
3255                 die("XCreateIC failed. Could not obtain input method.\n");
3256
3257         /* white cursor, black outline */
3258         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3259         XDefineCursor(xw.dpy, xw.win, cursor);
3260         XRecolorCursor(xw.dpy, cursor,
3261                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3262                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3263
3264         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3265         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3266         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3267         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3268
3269         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3270         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3271                         PropModeReplace, (uchar *)&thispid, 1);
3272
3273         xresettitle();
3274         XMapWindow(xw.dpy, xw.win);
3275         xhints();
3276         XSync(xw.dpy, False);
3277 }
3278
3279 int
3280 xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x, int y)
3281 {
3282         float winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch, xp, yp;
3283         ushort mode, prevmode = USHRT_MAX;
3284         Font *font = &dc.font;
3285         int frcflags = FRC_NORMAL;
3286         float runewidth = xw.cw;
3287         Rune rune;
3288         FT_UInt glyphidx;
3289         FcResult fcres;
3290         FcPattern *fcpattern, *fontpattern;
3291         FcFontSet *fcsets[] = { NULL };
3292         FcCharSet *fccharset;
3293         int i, f, numspecs = 0;
3294
3295         for(i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
3296                 /* Fetch rune and mode for current glyph. */
3297                 rune = glyphs[i].u;
3298                 mode = glyphs[i].mode;
3299
3300                 /* Skip dummy wide-character spacing. */
3301                 if(mode == ATTR_WDUMMY)
3302                         continue;
3303
3304                 /* Determine font for glyph if different from previous glyph. */
3305                 if(prevmode != mode) {
3306                         prevmode = mode;
3307                         font = &dc.font;
3308                         frcflags = FRC_NORMAL;
3309                         runewidth = xw.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
3310                         if((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
3311                                 font = &dc.ibfont;
3312                                 frcflags = FRC_ITALICBOLD;
3313                         } else if(mode & ATTR_ITALIC) {
3314                                 font = &dc.ifont;
3315                                 frcflags = FRC_ITALIC;
3316                         } else if(mode & ATTR_BOLD) {
3317                                 font = &dc.bfont;
3318                                 frcflags = FRC_BOLD;
3319                         }
3320                         yp = winy + font->ascent;
3321                 }
3322
3323                 /* Lookup character index with default font. */
3324                 glyphidx = XftCharIndex(xw.dpy, font->match, rune);
3325                 if(glyphidx) {
3326                         specs[numspecs].font = font->match;
3327                         specs[numspecs].glyph = glyphidx;
3328                         specs[numspecs].x = (short)xp;
3329                         specs[numspecs].y = (short)yp;
3330                         xp += runewidth;
3331                         numspecs++;
3332                         continue;
3333                 }
3334
3335                 /* Fallback on font cache, search the font cache for match. */
3336                 for(f = 0; f < frclen; f++) {
3337                         glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
3338                         /* Everything correct. */
3339                         if(glyphidx && frc[f].flags == frcflags)
3340                                 break;
3341                         /* We got a default font for a not found glyph. */
3342                         if(!glyphidx && frc[f].flags == frcflags
3343                                         && frc[f].unicodep == rune) {
3344                                 break;
3345                         }
3346                 }
3347
3348                 /* Nothing was found. Use fontconfig to find matching font. */
3349                 if(f >= frclen) {
3350                         if(!font->set)
3351                                 font->set = FcFontSort(0, font->pattern,
3352                                                        FcTrue, 0, &fcres);
3353                         fcsets[0] = font->set;
3354
3355                         /*
3356                          * Nothing was found in the cache. Now use
3357                          * some dozen of Fontconfig calls to get the
3358                          * font for one single character.
3359                          *
3360                          * Xft and fontconfig are design failures.
3361                          */
3362                         fcpattern = FcPatternDuplicate(font->pattern);
3363                         fccharset = FcCharSetCreate();
3364
3365                         FcCharSetAddChar(fccharset, rune);
3366                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3367                                         fccharset);
3368                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3369                                         FcTrue);
3370
3371                         FcConfigSubstitute(0, fcpattern,
3372                                         FcMatchPattern);
3373                         FcDefaultSubstitute(fcpattern);
3374
3375                         fontpattern = FcFontSetMatch(0, fcsets, 1,
3376                                         fcpattern, &fcres);
3377
3378                         /*
3379                          * Overwrite or create the new cache entry.
3380                          */
3381                         if(frclen >= LEN(frc)) {
3382                                 frclen = LEN(frc) - 1;
3383                                 XftFontClose(xw.dpy, frc[frclen].font);
3384                                 frc[frclen].unicodep = 0;
3385                         }
3386
3387                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3388                                         fontpattern);
3389                         frc[frclen].flags = frcflags;
3390                         frc[frclen].unicodep = rune;
3391
3392                         glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
3393
3394                         f = frclen;
3395                         frclen++;
3396
3397                         FcPatternDestroy(fcpattern);
3398                         FcCharSetDestroy(fccharset);
3399                 }
3400
3401                 specs[numspecs].font = frc[f].font;
3402                 specs[numspecs].glyph = glyphidx;
3403                 specs[numspecs].x = (short)xp;
3404                 specs[numspecs].y = (short)(winy + frc[f].font->ascent);
3405                 xp += runewidth;
3406                 numspecs++;
3407         }
3408
3409         return numspecs;
3410 }
3411
3412 void
3413 xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, int y) {
3414         int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
3415         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3416             width = charlen * xw.cw;
3417         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3418         XRenderColor colfg, colbg;
3419         XRectangle r;
3420
3421         /* Determine foreground and background colors based on mode. */
3422         if(base.fg == defaultfg) {
3423                 if(base.mode & ATTR_ITALIC)
3424                         base.fg = defaultitalic;
3425                 else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD))
3426                         base.fg = defaultitalic;
3427                 else if(base.mode & ATTR_UNDERLINE)
3428                         base.fg = defaultunderline;
3429         }
3430
3431         if(IS_TRUECOL(base.fg)) {
3432                 colfg.alpha = 0xffff;
3433                 colfg.red = TRUERED(base.fg);
3434                 colfg.green = TRUEGREEN(base.fg);
3435                 colfg.blue = TRUEBLUE(base.fg);
3436                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3437                 fg = &truefg;
3438         } else {
3439                 fg = &dc.col[base.fg];
3440         }
3441
3442         if(IS_TRUECOL(base.bg)) {
3443                 colbg.alpha = 0xffff;
3444                 colbg.green = TRUEGREEN(base.bg);
3445                 colbg.red = TRUERED(base.bg);
3446                 colbg.blue = TRUEBLUE(base.bg);
3447                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3448                 bg = &truebg;
3449         } else {
3450                 bg = &dc.col[base.bg];
3451         }
3452
3453         /* Change basic system colors [0-7] to bright system colors [8-15] */
3454         if((base.mode & ATTR_BOLD_FAINT) == ATTR_BOLD && BETWEEN(base.fg, 0, 7))
3455                 fg = &dc.col[base.fg + 8];
3456
3457         if(IS_SET(MODE_REVERSE)) {
3458                 if(fg == &dc.col[defaultfg]) {
3459                         fg = &dc.col[defaultbg];
3460                 } else {
3461                         colfg.red = ~fg->color.red;
3462                         colfg.green = ~fg->color.green;
3463                         colfg.blue = ~fg->color.blue;
3464                         colfg.alpha = fg->color.alpha;
3465                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3466                                         &revfg);
3467                         fg = &revfg;
3468                 }
3469
3470                 if(bg == &dc.col[defaultbg]) {
3471                         bg = &dc.col[defaultfg];
3472                 } else {
3473                         colbg.red = ~bg->color.red;
3474                         colbg.green = ~bg->color.green;
3475                         colbg.blue = ~bg->color.blue;
3476                         colbg.alpha = bg->color.alpha;
3477                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3478                                         &revbg);
3479                         bg = &revbg;
3480                 }
3481         }
3482
3483         if(base.mode & ATTR_REVERSE) {
3484                 temp = fg;
3485                 fg = bg;
3486                 bg = temp;
3487         }
3488
3489         if((base.mode & ATTR_BOLD_FAINT) == ATTR_FAINT) {
3490                 colfg.red = fg->color.red / 2;
3491                 colfg.green = fg->color.green / 2;
3492                 colfg.blue = fg->color.blue / 2;
3493                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3494                 fg = &revfg;
3495         }
3496
3497         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3498                 fg = bg;
3499
3500         if(base.mode & ATTR_INVISIBLE)
3501                 fg = bg;
3502
3503         /* Intelligent cleaning up of the borders. */
3504         if(x == 0) {
3505                 xclear(0, (y == 0)? 0 : winy, borderpx,
3506                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3507         }
3508         if(x + charlen >= term.col) {
3509                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3510                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3511         }
3512         if(y == 0)
3513                 xclear(winx, 0, winx + width, borderpx);
3514         if(y == term.row-1)
3515                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3516
3517         /* Clean up the region we want to draw to. */
3518         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3519
3520         /* Set the clip region because Xft is sometimes dirty. */
3521         r.x = 0;
3522         r.y = 0;
3523         r.height = xw.ch;
3524         r.width = width;
3525         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3526
3527         /* Render the glyphs. */
3528         XftDrawGlyphFontSpec(xw.draw, fg, specs, len);
3529
3530         /* Render underline and strikethrough. */
3531         if(base.mode & ATTR_UNDERLINE) {
3532                 XftDrawRect(xw.draw, fg, winx, winy + dc.font.ascent + 1,
3533                                 width, 1);
3534         }
3535
3536         if(base.mode & ATTR_STRUCK) {
3537                 XftDrawRect(xw.draw, fg, winx, winy + 2 * dc.font.ascent / 3,
3538                                 width, 1);
3539         }
3540
3541         /* Reset clip to none. */
3542         XftDrawSetClip(xw.draw, 0);
3543 }
3544
3545 void
3546 xdrawglyph(Glyph g, int x, int y) {
3547         int numspecs;
3548         XftGlyphFontSpec spec;
3549         numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
3550         xdrawglyphfontspecs(&spec, g, numspecs, x, y);
3551 }
3552
3553 void
3554 xdrawcursor(void) {
3555         static int oldx = 0, oldy = 0;
3556         int curx;
3557         Glyph g = {' ', ATTR_NULL, defaultbg, defaultcs};
3558
3559         LIMIT(oldx, 0, term.col-1);
3560         LIMIT(oldy, 0, term.row-1);
3561
3562         curx = term.c.x;
3563
3564         /* adjust position if in dummy */
3565         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3566                 oldx--;
3567         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3568                 curx--;
3569
3570         g.u = term.line[term.c.y][term.c.x].u;
3571
3572         /* remove the old cursor */
3573         xdrawglyph(term.line[oldy][oldx], oldx, oldy);
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                                 g.mode |= term.line[term.c.y][curx].mode & ATTR_WIDE;
3591                                 xdrawglyph(g, term.c.x, term.c.y);
3592                                 break;
3593                         case 3: /* Blinking Underline */
3594                         case 4: /* Steady Underline */
3595                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3596                                                 borderpx + curx * xw.cw,
3597                                                 borderpx + (term.c.y + 1) * xw.ch - cursorthickness,
3598                                                 xw.cw, cursorthickness);
3599                                 break;
3600                         case 5: /* Blinking bar */
3601                         case 6: /* Steady bar */
3602                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3603                                                 borderpx + curx * xw.cw,
3604                                                 borderpx + term.c.y * xw.ch,
3605                                                 cursorthickness, xw.ch);
3606                                 break;
3607                 }
3608         } else {
3609                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3610                                 borderpx + curx * xw.cw,
3611                                 borderpx + term.c.y * xw.ch,
3612                                 xw.cw - 1, 1);
3613                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3614                                 borderpx + curx * xw.cw,
3615                                 borderpx + term.c.y * xw.ch,
3616                                 1, xw.ch - 1);
3617                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3618                                 borderpx + (curx + 1) * xw.cw - 1,
3619                                 borderpx + term.c.y * xw.ch,
3620                                 1, xw.ch - 1);
3621                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3622                                 borderpx + curx * xw.cw,
3623                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3624                                 xw.cw, 1);
3625         }
3626         oldx = curx, oldy = term.c.y;
3627 }
3628
3629
3630 void
3631 xsettitle(char *p) {
3632         XTextProperty prop;
3633
3634         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3635                         &prop);
3636         XSetWMName(xw.dpy, xw.win, &prop);
3637         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3638         XFree(prop.value);
3639 }
3640
3641 void
3642 xresettitle(void) {
3643         xsettitle(opt_title ? opt_title : "st");
3644 }
3645
3646 void
3647 redraw(void) {
3648         tfulldirt();
3649         draw();
3650 }
3651
3652 void
3653 draw(void) {
3654         drawregion(0, 0, term.col, term.row);
3655         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3656                         xw.h, 0, 0);
3657         XSetForeground(xw.dpy, dc.gc,
3658                         dc.col[IS_SET(MODE_REVERSE)?
3659                                 defaultfg : defaultbg].pixel);
3660 }
3661
3662 void
3663 drawregion(int x1, int y1, int x2, int y2) {
3664         int i, x, y, ox, numspecs;
3665         Glyph base, new;
3666         XftGlyphFontSpec* specs;
3667         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3668
3669         if(!(xw.state & WIN_VISIBLE))
3670                 return;
3671
3672         for(y = y1; y < y2; y++) {
3673                 if(!term.dirty[y])
3674                         continue;
3675
3676                 xtermclear(0, y, term.col, y);
3677                 term.dirty[y] = 0;
3678
3679                 specs = term.specbuf;
3680                 numspecs = xmakeglyphfontspecs(specs, &term.line[y][x1], x2 - x1, x1, y);
3681
3682                 i = ox = 0;
3683                 for(x = x1; x < x2 && i < numspecs; 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(i > 0 && ATTRCMP(base, new)) {
3690                                 xdrawglyphfontspecs(specs, base, i, ox, y);
3691                                 specs += i;
3692                                 numspecs -= i;
3693                                 i = 0;
3694                         }
3695                         if(i == 0) {
3696                                 ox = x;
3697                                 base = new;
3698                         }
3699                         i++;
3700                 }
3701                 if(i > 0)
3702                         xdrawglyphfontspecs(specs, base, i, ox, y);
3703         }
3704         xdrawcursor();
3705 }
3706
3707 void
3708 expose(XEvent *ev) {
3709         redraw();
3710 }
3711
3712 void
3713 visibility(XEvent *ev) {
3714         XVisibilityEvent *e = &ev->xvisibility;
3715
3716         MODBIT(xw.state, e->state != VisibilityFullyObscured, WIN_VISIBLE);
3717 }
3718
3719 void
3720 unmap(XEvent *ev) {
3721         xw.state &= ~WIN_VISIBLE;
3722 }
3723
3724 void
3725 xsetpointermotion(int set) {
3726         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3727         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3728 }
3729
3730 void
3731 xseturgency(int add) {
3732         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3733
3734         MODBIT(h->flags, add, XUrgencyHint);
3735         XSetWMHints(xw.dpy, xw.win, h);
3736         XFree(h);
3737 }
3738
3739 void
3740 focus(XEvent *ev) {
3741         XFocusChangeEvent *e = &ev->xfocus;
3742
3743         if(e->mode == NotifyGrab)
3744                 return;
3745
3746         if(ev->type == FocusIn) {
3747                 XSetICFocus(xw.xic);
3748                 xw.state |= WIN_FOCUSED;
3749                 xseturgency(0);
3750                 if(IS_SET(MODE_FOCUS))
3751                         ttywrite("\033[I", 3);
3752         } else {
3753                 XUnsetICFocus(xw.xic);
3754                 xw.state &= ~WIN_FOCUSED;
3755                 if(IS_SET(MODE_FOCUS))
3756                         ttywrite("\033[O", 3);
3757         }
3758 }
3759
3760 bool
3761 match(uint mask, uint state) {
3762         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3763 }
3764
3765 void
3766 numlock(const Arg *dummy) {
3767         term.numlock ^= 1;
3768 }
3769
3770 char*
3771 kmap(KeySym k, uint state) {
3772         Key *kp;
3773         int i;
3774
3775         /* Check for mapped keys out of X11 function keys. */
3776         for(i = 0; i < LEN(mappedkeys); i++) {
3777                 if(mappedkeys[i] == k)
3778                         break;
3779         }
3780         if(i == LEN(mappedkeys)) {
3781                 if((k & 0xFFFF) < 0xFD00)
3782                         return NULL;
3783         }
3784
3785         for(kp = key; kp < key + LEN(key); kp++) {
3786                 if(kp->k != k)
3787                         continue;
3788
3789                 if(!match(kp->mask, state))
3790                         continue;
3791
3792                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3793                         continue;
3794                 if(term.numlock && kp->appkey == 2)
3795                         continue;
3796
3797                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3798                         continue;
3799
3800                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3801                         continue;
3802
3803                 return kp->s;
3804         }
3805
3806         return NULL;
3807 }
3808
3809 void
3810 kpress(XEvent *ev) {
3811         XKeyEvent *e = &ev->xkey;
3812         KeySym ksym;
3813         char buf[32], *customkey;
3814         int len;
3815         Rune c;
3816         Status status;
3817         Shortcut *bp;
3818
3819         if(IS_SET(MODE_KBDLOCK))
3820                 return;
3821
3822         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3823         /* 1. shortcuts */
3824         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3825                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3826                         bp->func(&(bp->arg));
3827                         return;
3828                 }
3829         }
3830
3831         /* 2. custom keys from config.h */
3832         if((customkey = kmap(ksym, e->state))) {
3833                 ttysend(customkey, strlen(customkey));
3834                 return;
3835         }
3836
3837         /* 3. composed string from input method */
3838         if(len == 0)
3839                 return;
3840         if(len == 1 && e->state & Mod1Mask) {
3841                 if(IS_SET(MODE_8BIT)) {
3842                         if(*buf < 0177) {
3843                                 c = *buf | 0x80;
3844                                 len = utf8encode(c, buf);
3845                         }
3846                 } else {
3847                         buf[1] = buf[0];
3848                         buf[0] = '\033';
3849                         len = 2;
3850                 }
3851         }
3852         ttysend(buf, len);
3853 }
3854
3855
3856 void
3857 cmessage(XEvent *e) {
3858         /*
3859          * See xembed specs
3860          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3861          */
3862         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3863                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3864                         xw.state |= WIN_FOCUSED;
3865                         xseturgency(0);
3866                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3867                         xw.state &= ~WIN_FOCUSED;
3868                 }
3869         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3870                 /* Send SIGHUP to shell */
3871                 kill(pid, SIGHUP);
3872                 exit(0);
3873         }
3874 }
3875
3876 void
3877 cresize(int width, int height) {
3878         int col, row;
3879
3880         if(width != 0)
3881                 xw.w = width;
3882         if(height != 0)
3883                 xw.h = height;
3884
3885         col = (xw.w - 2 * borderpx) / xw.cw;
3886         row = (xw.h - 2 * borderpx) / xw.ch;
3887
3888         tresize(col, row);
3889         xresize(col, row);
3890         ttyresize();
3891 }
3892
3893 void
3894 resize(XEvent *e) {
3895         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3896                 return;
3897
3898         cresize(e->xconfigure.width, e->xconfigure.height);
3899 }
3900
3901 void
3902 run(void) {
3903         XEvent ev;
3904         int w = xw.w, h = xw.h;
3905         fd_set rfd;
3906         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3907         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3908         long deltatime;
3909
3910         /* Waiting for window mapping */
3911         do {
3912                 XNextEvent(xw.dpy, &ev);
3913                 /*
3914                  * XFilterEvent is required to be called after you using XOpenIM,
3915                  * this is not unnecessary.It does not only filter the key event,
3916                  * but some clientmessage for input method as well.
3917                  */
3918                 if(XFilterEvent(&ev, None))
3919                         continue;
3920                 if(ev.type == ConfigureNotify) {
3921                         w = ev.xconfigure.width;
3922                         h = ev.xconfigure.height;
3923                 }
3924         } while(ev.type != MapNotify);
3925
3926         ttynew();
3927         cresize(w, h);
3928
3929         clock_gettime(CLOCK_MONOTONIC, &last);
3930         lastblink = last;
3931
3932         for(xev = actionfps;;) {
3933                 FD_ZERO(&rfd);
3934                 FD_SET(cmdfd, &rfd);
3935                 FD_SET(xfd, &rfd);
3936
3937                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3938                         if(errno == EINTR)
3939                                 continue;
3940                         die("select failed: %s\n", strerror(errno));
3941                 }
3942                 if(FD_ISSET(cmdfd, &rfd)) {
3943                         ttyread();
3944                         if(blinktimeout) {
3945                                 blinkset = tattrset(ATTR_BLINK);
3946                                 if(!blinkset)
3947                                         MODBIT(term.mode, 0, MODE_BLINK);
3948                         }
3949                 }
3950
3951                 if(FD_ISSET(xfd, &rfd))
3952                         xev = actionfps;
3953
3954                 clock_gettime(CLOCK_MONOTONIC, &now);
3955                 drawtimeout.tv_sec = 0;
3956                 drawtimeout.tv_nsec =  (1000 * 1E6)/ xfps;
3957                 tv = &drawtimeout;
3958
3959                 dodraw = 0;
3960                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3961                         tsetdirtattr(ATTR_BLINK);
3962                         term.mode ^= MODE_BLINK;
3963                         lastblink = now;
3964                         dodraw = 1;
3965                 }
3966                 deltatime = TIMEDIFF(now, last);
3967                 if(deltatime > 1000 / (xev ? xfps : actionfps)) {
3968                         dodraw = 1;
3969                         last = now;
3970                 }
3971
3972                 if(dodraw) {
3973                         while(XPending(xw.dpy)) {
3974                                 XNextEvent(xw.dpy, &ev);
3975                                 if(XFilterEvent(&ev, None))
3976                                         continue;
3977                                 if(handler[ev.type])
3978                                         (handler[ev.type])(&ev);
3979                         }
3980
3981                         draw();
3982                         XFlush(xw.dpy);
3983
3984                         if(xev && !FD_ISSET(xfd, &rfd))
3985                                 xev--;
3986                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3987                                 if(blinkset) {
3988                                         if(TIMEDIFF(now, lastblink) \
3989                                                         > blinktimeout) {
3990                                                 drawtimeout.tv_nsec = 1000;
3991                                         } else {
3992                                                 drawtimeout.tv_nsec = (1E6 * \
3993                                                         (blinktimeout - \
3994                                                         TIMEDIFF(now,
3995                                                                 lastblink)));
3996                                         }
3997                                         drawtimeout.tv_sec = \
3998                                             drawtimeout.tv_nsec / 1E9;
3999                                         drawtimeout.tv_nsec %= (long)1E9;
4000                                 } else {
4001                                         tv = NULL;
4002                                 }
4003                         }
4004                 }
4005         }
4006 }
4007
4008 void
4009 usage(void) {
4010         die("%s " VERSION " (c) 2010-2015 st engineers\n"
4011         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4012         "          [-i] [-t title] [-w windowid] [-e command ...] [command ...]\n"
4013         "       st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4014         "          [-i] [-t title] [-w windowid] [-l line] [stty_args ...]\n",
4015         argv0);
4016 }
4017
4018 int
4019 main(int argc, char *argv[]) {
4020         uint cols = 80, rows = 24;
4021
4022         xw.l = xw.t = 0;
4023         xw.isfixed = False;
4024         xw.cursor = 0;
4025
4026         ARGBEGIN {
4027         case 'a':
4028                 allowaltscreen = false;
4029                 break;
4030         case 'c':
4031                 opt_class = EARGF(usage());
4032                 break;
4033         case 'e':
4034                 if(argc > 0)
4035                         --argc, ++argv;
4036                 goto run;
4037         case 'f':
4038                 opt_font = EARGF(usage());
4039                 break;
4040         case 'g':
4041                 xw.gm = XParseGeometry(EARGF(usage()),
4042                                 &xw.l, &xw.t, &cols, &rows);
4043                 break;
4044         case 'i':
4045                 xw.isfixed = True;
4046                 break;
4047         case 'o':
4048                 opt_io = EARGF(usage());
4049                 break;
4050         case 'l':
4051                 opt_line = EARGF(usage());
4052                 break;
4053         case 't':
4054                 opt_title = EARGF(usage());
4055                 break;
4056         case 'w':
4057                 opt_embed = EARGF(usage());
4058                 break;
4059         case 'v':
4060         default:
4061                 usage();
4062         } ARGEND;
4063
4064 run:
4065         if(argc > 0) {
4066                 /* eat all remaining arguments */
4067                 opt_cmd = argv;
4068                 if(!opt_title && !opt_line)
4069                         opt_title = basename(xstrdup(argv[0]));
4070         }
4071         setlocale(LC_CTYPE, "");
4072         XSetLocaleModifiers("");
4073         tnew(MAX(cols, 1), MAX(rows, 1));
4074         xinit();
4075         selinit();
4076         run();
4077
4078         return 0;
4079 }
4080