st.c

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