st.c

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