st.c

   1 /* See LICENSE for license details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <X11/XKBlib.h>
  31 #include <fontconfig/fontconfig.h>
  32 #include <wchar.h>
  33
  34 #include "arg.h"
  35
  36 char *argv0;
  37
  38 #define Glyph Glyph_
  39 #define Font Font_
  40
  41 #if   defined(__linux)
  42  #include <pty.h>
  43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  44  #include <util.h>
  45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  46  #include <libutil.h>
  47 #endif
  48
  49
  50 /* XEMBED messages */
  51 #define XEMBED_FOCUS_IN  4
  52 #define XEMBED_FOCUS_OUT 5
  53
  54 /* Arbitrary sizes */
  55 #define UTF_INVALID   0xFFFD
  56 #define UTF_SIZ       4
  57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  58 #define ESC_ARG_SIZ   16
  59 #define STR_BUF_SIZ   ESC_BUF_SIZ
  60 #define STR_ARG_SIZ   ESC_ARG_SIZ
  61 #define 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 stty(void);
 356 static void sigchld(int);
 357 static void run(void);
 358
 359 static void csidump(void);
 360 static void csihandle(void);
 361 static void csiparse(void);
 362 static void csireset(void);
 363 static int eschandle(uchar);
 364 static void strdump(void);
 365 static void strhandle(void);
 366 static void strparse(void);
 367 static void strreset(void);
 368
 369 static int tattrset(int);
 370 static void tprinter(char *, size_t);
 371 static void tdumpsel(void);
 372 static void tdumpline(int);
 373 static void tdump(void);
 374 static void tclearregion(int, int, int, int);
 375 static void tcursor(int);
 376 static void tdeletechar(int);
 377 static void tdeleteline(int);
 378 static void tinsertblank(int);
 379 static void tinsertblankline(int);
 380 static int tlinelen(int);
 381 static void tmoveto(int, int);
 382 static void tmoveato(int, int);
 383 static void tnew(int, int);
 384 static void tnewline(int);
 385 static void tputtab(int);
 386 static void tputc(char *, int);
 387 static void treset(void);
 388 static void tresize(int, int);
 389 static void tscrollup(int, int);
 390 static void tscrolldown(int, int);
 391 static void tsetattr(int *, int);
 392 static void tsetchar(char *, Glyph *, int, int);
 393 static void tsetscroll(int, int);
 394 static void tswapscreen(void);
 395 static void tsetdirt(int, int);
 396 static void tsetdirtattr(int);
 397 static void tsetmode(bool, bool, int *, int);
 398 static void tfulldirt(void);
 399 static void techo(char *, int);
 400 static void tcontrolcode(uchar );
 401 static void tdectest(char );
 402 static int32_t tdefcolor(int *, int *, int);
 403 static void tdeftran(char);
 404 static inline bool match(uint, uint);
 405 static void ttynew(void);
 406 static void ttyread(void);
 407 static void ttyresize(void);
 408 static void ttysend(char *, size_t);
 409 static void ttywrite(const char *, size_t);
 410 static void tstrsequence(uchar);
 411
 412 static inline ushort sixd_to_16bit(int);
 413 static void xdraws(char *, Glyph, int, int, int, int);
 414 static void xhints(void);
 415 static void xclear(int, int, int, int);
 416 static void xdrawcursor(void);
 417 static void xinit(void);
 418 static void xloadcols(void);
 419 static int xsetcolorname(int, const char *);
 420 static int xgeommasktogravity(int);
 421 static int xloadfont(Font *, FcPattern *);
 422 static void xloadfonts(char *, double);
 423 static void xsettitle(char *);
 424 static void xresettitle(void);
 425 static void xsetpointermotion(int);
 426 static void xseturgency(int);
 427 static void xsetsel(char *, Time);
 428 static void xtermclear(int, int, int, int);
 429 static void xunloadfont(Font *);
 430 static void xunloadfonts(void);
 431 static void xresize(int, int);
 432
 433 static void expose(XEvent *);
 434 static void visibility(XEvent *);
 435 static void unmap(XEvent *);
 436 static char *kmap(KeySym, uint);
 437 static void kpress(XEvent *);
 438 static void cmessage(XEvent *);
 439 static void cresize(int, int);
 440 static void resize(XEvent *);
 441 static void focus(XEvent *);
 442 static void brelease(XEvent *);
 443 static void bpress(XEvent *);
 444 static void bmotion(XEvent *);
 445 static void selnotify(XEvent *);
 446 static void selclear(XEvent *);
 447 static void selrequest(XEvent *);
 448
 449 static void selinit(void);
 450 static void selnormalize(void);
 451 static inline bool selected(int, int);
 452 static char *getsel(void);
 453 static void selcopy(Time);
 454 static void selscroll(int, int);
 455 static void selsnap(int, int *, int *, int);
 456 static int x2col(int);
 457 static int y2row(int);
 458 static void getbuttoninfo(XEvent *);
 459 static void mousereport(XEvent *);
 460
 461 static size_t utf8decode(char *, long *, size_t);
 462 static long utf8decodebyte(char, size_t *);
 463 static size_t utf8encode(long, char *, size_t);
 464 static char utf8encodebyte(long, size_t);
 465 static size_t utf8len(char *);
 466 static size_t utf8validate(long *, size_t);
 467
 468 static ssize_t xwrite(int, const char *, size_t);
 469 static void *xmalloc(size_t);
 470 static void *xrealloc(void *, size_t);
 471 static char *xstrdup(char *);
 472
 473 static void usage(void);
 474
 475 static void (*handler[LASTEvent])(XEvent *) = {
 476         [KeyPress] = kpress,
 477         [ClientMessage] = cmessage,
 478         [ConfigureNotify] = resize,
 479         [VisibilityNotify] = visibility,
 480         [UnmapNotify] = unmap,
 481         [Expose] = expose,
 482         [FocusIn] = focus,
 483         [FocusOut] = focus,
 484         [MotionNotify] = bmotion,
 485         [ButtonPress] = bpress,
 486         [ButtonRelease] = brelease,
 487 /*
 488  * Uncomment if you want the selection to disappear when you select something
 489  * different in another window.
 490  */
 491 /*      [SelectionClear] = selclear, */
 492         [SelectionNotify] = selnotify,
 493         [SelectionRequest] = selrequest,
 494 };
 495
 496 /* Globals */
 497 static DC dc;
 498 static XWindow xw;
 499 static Term term;
 500 static CSIEscape csiescseq;
 501 static STREscape strescseq;
 502 static int cmdfd;
 503 static pid_t pid;
 504 static Selection sel;
 505 static int iofd = STDOUT_FILENO;
 506 static char **opt_cmd = NULL;
 507 static char *opt_io = NULL;
 508 static char *opt_title = NULL;
 509 static char *opt_embed = NULL;
 510 static char *opt_class = NULL;
 511 static char *opt_font = NULL;
 512 static char *opt_line = NULL;
 513 static int oldbutton = 3; /* button event on startup: 3 = release */
 514
 515 static char *usedfont = NULL;
 516 static double usedfontsize = 0;
 517 static double defaultfontsize = 0;
 518
 519 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 520 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 521 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 522 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 523
 524 /* Font Ring Cache */
 525 enum {
 526         FRC_NORMAL,
 527         FRC_ITALIC,
 528         FRC_BOLD,
 529         FRC_ITALICBOLD
 530 };
 531
 532 typedef struct {
 533         XftFont *font;
 534         int flags;
 535         long unicodep;
 536 } Fontcache;
 537
 538 /* Fontcache is an array now. A new font will be appended to the array. */
 539 static Fontcache frc[16];
 540 static int frclen = 0;
 541
 542 ssize_t
 543 xwrite(int fd, const char *s, size_t len) {
 544         size_t aux = len;
 545
 546         while(len > 0) {
 547                 ssize_t r = write(fd, s, len);
 548                 if(r < 0)
 549                         return r;
 550                 len -= r;
 551                 s += r;
 552         }
 553         return aux;
 554 }
 555
 556 void *
 557 xmalloc(size_t len) {
 558         void *p = malloc(len);
 559
 560         if(!p)
 561                 die("Out of memory\n");
 562
 563         return p;
 564 }
 565
 566 void *
 567 xrealloc(void *p, size_t len) {
 568         if((p = realloc(p, len)) == NULL)
 569                 die("Out of memory\n");
 570
 571         return p;
 572 }
 573
 574 char *
 575 xstrdup(char *s) {
 576         if((s = strdup(s)) == NULL)
 577                 die("Out of memory\n");
 578
 579         return s;
 580 }
 581
 582 size_t
 583 utf8decode(char *c, long *u, size_t clen) {
 584         size_t i, j, len, type;
 585         long udecoded;
 586
 587         *u = UTF_INVALID;
 588         if(!clen)
 589                 return 0;
 590         udecoded = utf8decodebyte(c[0], &len);
 591         if(!BETWEEN(len, 1, UTF_SIZ))
 592                 return 1;
 593         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 594                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 595                 if(type != 0)
 596                         return j;
 597         }
 598         if(j < len)
 599                 return 0;
 600         *u = udecoded;
 601         utf8validate(u, len);
 602         return len;
 603 }
 604
 605 long
 606 utf8decodebyte(char c, size_t *i) {
 607         for(*i = 0; *i < LEN(utfmask); ++(*i))
 608                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 609                         return (uchar)c & ~utfmask[*i];
 610         return 0;
 611 }
 612
 613 size_t
 614 utf8encode(long u, char *c, size_t clen) {
 615         size_t len, i;
 616
 617         len = utf8validate(&u, 0);
 618         if(clen < len)
 619                 return 0;
 620         for(i = len - 1; i != 0; --i) {
 621                 c[i] = utf8encodebyte(u, 0);
 622                 u >>= 6;
 623         }
 624         c[0] = utf8encodebyte(u, len);
 625         return len;
 626 }
 627
 628 char
 629 utf8encodebyte(long u, size_t i) {
 630         return utfbyte[i] | (u & ~utfmask[i]);
 631 }
 632
 633 size_t
 634 utf8len(char *c) {
 635         return utf8decode(c, &(long){0}, UTF_SIZ);
 636 }
 637
 638 size_t
 639 utf8validate(long *u, size_t i) {
 640         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 641                 *u = UTF_INVALID;
 642         for(i = 1; *u > utfmax[i]; ++i)
 643                 ;
 644         return i;
 645 }
 646
 647 void
 648 selinit(void) {
 649         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 650         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 651         sel.mode = 0;
 652         sel.ob.x = -1;
 653         sel.primary = NULL;
 654         sel.clipboard = NULL;
 655         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 656         if(sel.xtarget == None)
 657                 sel.xtarget = XA_STRING;
 658 }
 659
 660 int
 661 x2col(int x) {
 662         x -= borderpx;
 663         x /= xw.cw;
 664
 665         return LIMIT(x, 0, term.col-1);
 666 }
 667
 668 int
 669 y2row(int y) {
 670         y -= borderpx;
 671         y /= xw.ch;
 672
 673         return LIMIT(y, 0, term.row-1);
 674 }
 675
 676 int
 677 tlinelen(int y) {
 678         int i = term.col;
 679
 680         if(term.line[y][i - 1].mode & ATTR_WRAP)
 681                 return i;
 682
 683         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
 684                 --i;
 685
 686         return i;
 687 }
 688
 689 void
 690 selnormalize(void) {
 691         int i;
 692
 693         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 694                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 695                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 696         } else {
 697                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 698                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 699         }
 700         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 701         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 702
 703         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
 704         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
 705
 706         /* expand selection over line breaks */
 707         if (sel.type == SEL_RECTANGULAR)
 708                 return;
 709         i = tlinelen(sel.nb.y);
 710         if (i < sel.nb.x)
 711                 sel.nb.x = i;
 712         if (tlinelen(sel.ne.y) <= sel.ne.x)
 713                 sel.ne.x = term.col - 1;
 714 }
 715
 716 bool
 717 selected(int x, int y) {
 718         if(sel.type == SEL_RECTANGULAR)
 719                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 720                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 721
 722         return BETWEEN(y, sel.nb.y, sel.ne.y)
 723             && (y != sel.nb.y || x >= sel.nb.x)
 724             && (y != sel.ne.y || x <= sel.ne.x);
 725 }
 726
 727 void
 728 selsnap(int mode, int *x, int *y, int direction) {
 729         int newx, newy, xt, yt;
 730         bool delim, prevdelim;
 731         Glyph *gp, *prevgp;
 732
 733         switch(mode) {
 734         case SNAP_WORD:
 735                 /*
 736                  * Snap around if the word wraps around at the end or
 737                  * beginning of a line.
 738                  */
 739                 prevgp = &term.line[*y][*x];
 740                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
 741                 for(;;) {
 742                         newx = *x + direction;
 743                         newy = *y;
 744                         if(!BETWEEN(newx, 0, term.col - 1)) {
 745                                 newy += direction;
 746                                 newx = (newx + term.col) % term.col;
 747                                 if (!BETWEEN(newy, 0, term.row - 1))
 748                                         break;
 749
 750                                 if(direction > 0)
 751                                         yt = *y, xt = *x;
 752                                 else
 753                                         yt = newy, xt = newx;
 754                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 755                                         break;
 756                         }
 757
 758                         if (newx >= tlinelen(newy))
 759                                 break;
 760
 761                         gp = &term.line[newy][newx];
 762                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
 763                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 764                                         || (delim && gp->c[0] != prevgp->c[0])))
 765                                 break;
 766
 767                         *x = newx;
 768                         *y = newy;
 769                         prevgp = gp;
 770                         prevdelim = delim;
 771                 }
 772                 break;
 773         case SNAP_LINE:
 774                 /*
 775                  * Snap around if the the previous line or the current one
 776                  * has set ATTR_WRAP at its end. Then the whole next or
 777                  * previous line will be selected.
 778                  */
 779                 *x = (direction < 0) ? 0 : term.col - 1;
 780                 if(direction < 0 && *y > 0) {
 781                         for(; *y > 0; *y += direction) {
 782                                 if(!(term.line[*y-1][term.col-1].mode
 783                                                 & ATTR_WRAP)) {
 784                                         break;
 785                                 }
 786                         }
 787                 } else if(direction > 0 && *y < term.row-1) {
 788                         for(; *y < term.row; *y += direction) {
 789                                 if(!(term.line[*y][term.col-1].mode
 790                                                 & ATTR_WRAP)) {
 791                                         break;
 792                                 }
 793                         }
 794                 }
 795                 break;
 796         }
 797 }
 798
 799 void
 800 getbuttoninfo(XEvent *e) {
 801         int type;
 802         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 803
 804         sel.alt = IS_SET(MODE_ALTSCREEN);
 805
 806         sel.oe.x = x2col(e->xbutton.x);
 807         sel.oe.y = y2row(e->xbutton.y);
 808         selnormalize();
 809
 810         sel.type = SEL_REGULAR;
 811         for(type = 1; type < LEN(selmasks); ++type) {
 812                 if(match(selmasks[type], state)) {
 813                         sel.type = type;
 814                         break;
 815                 }
 816         }
 817 }
 818
 819 void
 820 mousereport(XEvent *e) {
 821         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 822             button = e->xbutton.button, state = e->xbutton.state,
 823             len;
 824         char buf[40];
 825         static int ox, oy;
 826
 827         /* from urxvt */
 828         if(e->xbutton.type == MotionNotify) {
 829                 if(x == ox && y == oy)
 830                         return;
 831                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 832                         return;
 833                 /* MOUSE_MOTION: no reporting if no button is pressed */
 834                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 835                         return;
 836
 837                 button = oldbutton + 32;
 838                 ox = x;
 839                 oy = y;
 840         } else {
 841                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 842                         button = 3;
 843                 } else {
 844                         button -= Button1;
 845                         if(button >= 3)
 846                                 button += 64 - 3;
 847                 }
 848                 if(e->xbutton.type == ButtonPress) {
 849                         oldbutton = button;
 850                         ox = x;
 851                         oy = y;
 852                 } else if(e->xbutton.type == ButtonRelease) {
 853                         oldbutton = 3;
 854                         /* MODE_MOUSEX10: no button release reporting */
 855                         if(IS_SET(MODE_MOUSEX10))
 856                                 return;
 857                         if (button == 64 || button == 65)
 858                                 return;
 859                 }
 860         }
 861
 862         if(!IS_SET(MODE_MOUSEX10)) {
 863                 button += (state & ShiftMask   ? 4  : 0)
 864                         + (state & Mod4Mask    ? 8  : 0)
 865                         + (state & ControlMask ? 16 : 0);
 866         }
 867
 868         len = 0;
 869         if(IS_SET(MODE_MOUSESGR)) {
 870                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 871                                 button, x+1, y+1,
 872                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 873         } else if(x < 223 && y < 223) {
 874                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 875                                 32+button, 32+x+1, 32+y+1);
 876         } else {
 877                 return;
 878         }
 879
 880         ttywrite(buf, len);
 881 }
 882
 883 void
 884 bpress(XEvent *e) {
 885         struct timespec now;
 886         Mousekey *mk;
 887
 888         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 889                 mousereport(e);
 890                 return;
 891         }
 892
 893         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 894                 if(e->xbutton.button == mk->b
 895                                 && match(mk->mask, e->xbutton.state)) {
 896                         ttysend(mk->s, strlen(mk->s));
 897                         return;
 898                 }
 899         }
 900
 901         if(e->xbutton.button == Button1) {
 902                 clock_gettime(CLOCK_MONOTONIC, &now);
 903
 904                 /* Clear previous selection, logically and visually. */
 905                 selclear(NULL);
 906                 sel.mode = 1;
 907                 sel.type = SEL_REGULAR;
 908                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 909                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 910
 911                 /*
 912                  * If the user clicks below predefined timeouts specific
 913                  * snapping behaviour is exposed.
 914                  */
 915                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 916                         sel.snap = SNAP_LINE;
 917                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 918                         sel.snap = SNAP_WORD;
 919                 } else {
 920                         sel.snap = 0;
 921                 }
 922                 selnormalize();
 923
 924                 /*
 925                  * Draw selection, unless it's regular and we don't want to
 926                  * make clicks visible
 927                  */
 928                 if(sel.snap != 0) {
 929                         sel.mode++;
 930                         tsetdirt(sel.nb.y, sel.ne.y);
 931                 }
 932                 sel.tclick2 = sel.tclick1;
 933                 sel.tclick1 = now;
 934         }
 935 }
 936
 937 char *
 938 getsel(void) {
 939         char *str, *ptr;
 940         int y, bufsize, size, lastx, linelen;
 941         Glyph *gp, *last;
 942
 943         if(sel.ob.x == -1)
 944                 return NULL;
 945
 946         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 947         ptr = str = xmalloc(bufsize);
 948
 949         /* append every set & selected glyph to the selection */
 950         for(y = sel.nb.y; y <= sel.ne.y; y++) {
 951                 linelen = tlinelen(y);
 952
 953                 if(sel.type == SEL_RECTANGULAR) {
 954                         gp = &term.line[y][sel.nb.x];
 955                         lastx = sel.ne.x;
 956                 } else {
 957                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 958                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 959                 }
 960                 last = &term.line[y][MIN(lastx, linelen-1)];
 961                 while(last >= gp && last->c[0] == ' ')
 962                         --last;
 963
 964                 for( ; gp <= last; ++gp) {
 965                         if(gp->mode & ATTR_WDUMMY)
 966                                 continue;
 967
 968                         size = utf8len(gp->c);
 969                         memcpy(ptr, gp->c, size);
 970                         ptr += size;
 971                 }
 972
 973                 /*
 974                  * Copy and pasting of line endings is inconsistent
 975                  * in the inconsistent terminal and GUI world.
 976                  * The best solution seems like to produce '\n' when
 977                  * something is copied from st and convert '\n' to
 978                  * '\r', when something to be pasted is received by
 979                  * st.
 980                  * FIXME: Fix the computer world.
 981                  */
 982                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 983                         *ptr++ = '\n';
 984         }
 985         *ptr = 0;
 986         return str;
 987 }
 988
 989 void
 990 selcopy(Time t) {
 991         xsetsel(getsel(), t);
 992 }
 993
 994 void
 995 selnotify(XEvent *e) {
 996         ulong nitems, ofs, rem;
 997         int format;
 998         uchar *data, *last, *repl;
 999         Atom type;
1000         XSelectionEvent *xsev;
1001
1002         ofs = 0;
1003         xsev = &e->xselection;
1004         if (xsev->property == None)
1005             return;
1006         do {
1007                 if(XGetWindowProperty(xw.dpy, xw.win, xsev->property, ofs,
1008                                         BUFSIZ/4, False, AnyPropertyType,
1009                                         &type, &format, &nitems, &rem,
1010                                         &data)) {
1011                         fprintf(stderr, "Clipboard allocation failed\n");
1012                         return;
1013                 }
1014
1015                 /*
1016                  * As seen in getsel:
1017                  * Line endings are inconsistent in the terminal and GUI world
1018                  * copy and pasting. When receiving some selection data,
1019                  * replace all '\n' with '\r'.
1020                  * FIXME: Fix the computer world.
1021                  */
1022                 repl = data;
1023                 last = data + nitems * format / 8;
1024                 while((repl = memchr(repl, '\n', last - repl))) {
1025                         *repl++ = '\r';
1026                 }
1027
1028                 if(IS_SET(MODE_BRCKTPASTE))
1029                         ttywrite("\033[200~", 6);
1030                 ttysend((char *)data, nitems * format / 8);
1031                 if(IS_SET(MODE_BRCKTPASTE))
1032                         ttywrite("\033[201~", 6);
1033                 XFree(data);
1034                 /* number of 32-bit chunks returned */
1035                 ofs += nitems * format / 32;
1036         } while(rem > 0);
1037 }
1038
1039 void
1040 selpaste(const Arg *dummy) {
1041         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1042                         xw.win, CurrentTime);
1043 }
1044
1045 void
1046 clipcopy(const Arg *dummy) {
1047         Atom clipboard;
1048
1049         if(sel.clipboard != NULL)
1050                 free(sel.clipboard);
1051
1052         if(sel.primary != NULL) {
1053                 sel.clipboard = xstrdup(sel.primary);
1054                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1055                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1056         }
1057 }
1058
1059 void
1060 clippaste(const Arg *dummy) {
1061         Atom clipboard;
1062
1063         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1064         XConvertSelection(xw.dpy, clipboard, sel.xtarget, clipboard,
1065                         xw.win, CurrentTime);
1066 }
1067
1068 void
1069 selclear(XEvent *e) {
1070         if(sel.ob.x == -1)
1071                 return;
1072         sel.ob.x = -1;
1073         tsetdirt(sel.nb.y, sel.ne.y);
1074 }
1075
1076 void
1077 selrequest(XEvent *e) {
1078         XSelectionRequestEvent *xsre;
1079         XSelectionEvent xev;
1080         Atom xa_targets, string, clipboard;
1081         char *seltext;
1082
1083         xsre = (XSelectionRequestEvent *) e;
1084         xev.type = SelectionNotify;
1085         xev.requestor = xsre->requestor;
1086         xev.selection = xsre->selection;
1087         xev.target = xsre->target;
1088         xev.time = xsre->time;
1089         if (xsre->property == None)
1090             xsre->property = xsre->target;
1091
1092         /* reject */
1093         xev.property = None;
1094
1095         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1096         if(xsre->target == xa_targets) {
1097                 /* respond with the supported type */
1098                 string = sel.xtarget;
1099                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1100                                 XA_ATOM, 32, PropModeReplace,
1101                                 (uchar *) &string, 1);
1102                 xev.property = xsre->property;
1103         } else if(xsre->target == sel.xtarget || xsre->target == XA_STRING) {
1104                 /*
1105                  * xith XA_STRING non ascii characters may be incorrect in the
1106                  * requestor. It is not our problem, use utf8.
1107                  */
1108                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1109                 if(xsre->selection == XA_PRIMARY) {
1110                         seltext = sel.primary;
1111                 } else if(xsre->selection == clipboard) {
1112                         seltext = sel.clipboard;
1113                 } else {
1114                         fprintf(stderr,
1115                                 "Unhandled clipboard selection 0x%lx\n",
1116                                 xsre->selection);
1117                         return;
1118                 }
1119                 if(seltext != NULL) {
1120                         XChangeProperty(xsre->display, xsre->requestor,
1121                                         xsre->property, xsre->target,
1122                                         8, PropModeReplace,
1123                                         (uchar *)seltext, strlen(seltext));
1124                         xev.property = xsre->property;
1125                 }
1126         }
1127
1128         /* all done, send a notification to the listener */
1129         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1130                 fprintf(stderr, "Error sending SelectionNotify event\n");
1131 }
1132
1133 void
1134 xsetsel(char *str, Time t) {
1135         free(sel.primary);
1136         sel.primary = str;
1137
1138         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
1139         if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
1140             selclear(0);
1141 }
1142
1143 void
1144 brelease(XEvent *e) {
1145         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1146                 mousereport(e);
1147                 return;
1148         }
1149
1150         if(e->xbutton.button == Button2) {
1151                 selpaste(NULL);
1152         } else if(e->xbutton.button == Button1) {
1153                 if(sel.mode < 2) {
1154                         selclear(NULL);
1155                 } else {
1156                         getbuttoninfo(e);
1157                         selcopy(e->xbutton.time);
1158                 }
1159                 sel.mode = 0;
1160                 tsetdirt(sel.nb.y, sel.ne.y);
1161         }
1162 }
1163
1164 void
1165 bmotion(XEvent *e) {
1166         int oldey, oldex, oldsby, oldsey;
1167
1168         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1169                 mousereport(e);
1170                 return;
1171         }
1172
1173         if(!sel.mode)
1174                 return;
1175
1176         sel.mode++;
1177         oldey = sel.oe.y;
1178         oldex = sel.oe.x;
1179         oldsby = sel.nb.y;
1180         oldsey = sel.ne.y;
1181         getbuttoninfo(e);
1182
1183         if(oldey != sel.oe.y || oldex != sel.oe.x)
1184                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1185 }
1186
1187 void
1188 die(const char *errstr, ...) {
1189         va_list ap;
1190
1191         va_start(ap, errstr);
1192         vfprintf(stderr, errstr, ap);
1193         va_end(ap);
1194         exit(EXIT_FAILURE);
1195 }
1196
1197 void
1198 execsh(void) {
1199         char **args, *sh, *prog;
1200         const struct passwd *pw;
1201         char buf[sizeof(long) * 8 + 1];
1202
1203         errno = 0;
1204         if((pw = getpwuid(getuid())) == NULL) {
1205                 if(errno)
1206                         die("getpwuid:%s\n", strerror(errno));
1207                 else
1208                         die("who are you?\n");
1209         }
1210
1211         if (!(sh = getenv("SHELL"))) {
1212                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1213         }
1214
1215         if(opt_cmd)
1216                 prog = opt_cmd[0];
1217         else if(utmp)
1218                 prog = utmp;
1219         else
1220                 prog = sh;
1221         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1222
1223         snprintf(buf, sizeof(buf), "%lu", xw.win);
1224
1225         unsetenv("COLUMNS");
1226         unsetenv("LINES");
1227         unsetenv("TERMCAP");
1228         setenv("LOGNAME", pw->pw_name, 1);
1229         setenv("USER", pw->pw_name, 1);
1230         setenv("SHELL", sh, 1);
1231         setenv("HOME", pw->pw_dir, 1);
1232         setenv("TERM", termname, 1);
1233         setenv("WINDOWID", buf, 1);
1234
1235         signal(SIGCHLD, SIG_DFL);
1236         signal(SIGHUP, SIG_DFL);
1237         signal(SIGINT, SIG_DFL);
1238         signal(SIGQUIT, SIG_DFL);
1239         signal(SIGTERM, SIG_DFL);
1240         signal(SIGALRM, SIG_DFL);
1241
1242         execvp(prog, args);
1243         _exit(EXIT_FAILURE);
1244 }
1245
1246 void
1247 sigchld(int a) {
1248         int stat, ret;
1249
1250         if(waitpid(pid, &stat, 0) < 0)
1251                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1252
1253         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1254         if (ret != EXIT_SUCCESS)
1255                 die("child finished with error '%d'\n", stat);
1256         exit(EXIT_SUCCESS);
1257 }
1258
1259
1260 void
1261 stty(void)
1262 {
1263         char cmd[_POSIX_ARG_MAX], **p, *q, *s;
1264         size_t n, siz;
1265
1266         if((n = strlen(stty_args)) > sizeof(cmd)-1)
1267                 die("incorrect stty parameters\n");
1268         memcpy(cmd, stty_args, n);
1269         q = cmd + n;
1270         siz = sizeof(cmd) - n;
1271         for(p = opt_cmd; p && (s = *p); ++p) {
1272                 if((n = strlen(s)) > siz-1)
1273                         die("stty parameter length too long\n");
1274                 *q++ = ' ';
1275                 q = memcpy(q, s, n);
1276                 q += n;
1277                 siz-= n + 1;
1278         }
1279         *q = '\0';
1280         system(cmd);
1281 }
1282
1283 void
1284 ttynew(void) {
1285         int m, s;
1286         struct winsize w = {term.row, term.col, 0, 0};
1287
1288         if(opt_io) {
1289                 term.mode |= MODE_PRINT;
1290                 iofd = (!strcmp(opt_io, "-")) ?
1291                           STDOUT_FILENO :
1292                           open(opt_io, O_WRONLY | O_CREAT, 0666);
1293                 if(iofd < 0) {
1294                         fprintf(stderr, "Error opening %s:%s\n",
1295                                 opt_io, strerror(errno));
1296                 }
1297         }
1298
1299         if (opt_line) {
1300                 if((cmdfd = open(opt_line, O_RDWR)) < 0)
1301                         die("open line failed: %s\n", strerror(errno));
1302                 close(STDIN_FILENO);
1303                 dup(cmdfd);
1304                 stty();
1305                 return;
1306         }
1307
1308         /* seems to work fine on linux, openbsd and freebsd */
1309         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1310                 die("openpty failed: %s\n", strerror(errno));
1311
1312         switch(pid = fork()) {
1313         case -1:
1314                 die("fork failed\n");
1315                 break;
1316         case 0:
1317                 close(iofd);
1318                 setsid(); /* create a new process group */
1319                 dup2(s, STDIN_FILENO);
1320                 dup2(s, STDOUT_FILENO);
1321                 dup2(s, STDERR_FILENO);
1322                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1323                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1324                 close(s);
1325                 close(m);
1326                 execsh();
1327                 break;
1328         default:
1329                 close(s);
1330                 cmdfd = m;
1331                 signal(SIGCHLD, sigchld);
1332                 break;
1333         }
1334 }
1335
1336 void
1337 ttyread(void) {
1338         static char buf[BUFSIZ];
1339         static int buflen = 0;
1340         char *ptr;
1341         char s[UTF_SIZ];
1342         int charsize; /* size of utf8 char in bytes */
1343         long unicodep;
1344         int ret;
1345
1346         /* append read bytes to unprocessed bytes */
1347         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1348                 die("Couldn't read from shell: %s\n", strerror(errno));
1349
1350         /* process every complete utf8 char */
1351         buflen += ret;
1352         ptr = buf;
1353         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1354                 utf8encode(unicodep, s, UTF_SIZ);
1355                 tputc(s, charsize);
1356                 ptr += charsize;
1357                 buflen -= charsize;
1358         }
1359
1360         /* keep any uncomplete utf8 char for the next call */
1361         memmove(buf, ptr, buflen);
1362 }
1363
1364 void
1365 ttywrite(const char *s, size_t n) {
1366         if(xwrite(cmdfd, s, n) == -1)
1367                 die("write error on tty: %s\n", strerror(errno));
1368 }
1369
1370 void
1371 ttysend(char *s, size_t n) {
1372         ttywrite(s, n);
1373         if(IS_SET(MODE_ECHO))
1374                 techo(s, n);
1375 }
1376
1377 void
1378 ttyresize(void) {
1379         struct winsize w;
1380
1381         w.ws_row = term.row;
1382         w.ws_col = term.col;
1383         w.ws_xpixel = xw.tw;
1384         w.ws_ypixel = xw.th;
1385         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1386                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1387 }
1388
1389 int
1390 tattrset(int attr) {
1391         int i, j;
1392
1393         for(i = 0; i < term.row-1; i++) {
1394                 for(j = 0; j < term.col-1; j++) {
1395                         if(term.line[i][j].mode & attr)
1396                                 return 1;
1397                 }
1398         }
1399
1400         return 0;
1401 }
1402
1403 void
1404 tsetdirt(int top, int bot) {
1405         int i;
1406
1407         LIMIT(top, 0, term.row-1);
1408         LIMIT(bot, 0, term.row-1);
1409
1410         for(i = top; i <= bot; i++)
1411                 term.dirty[i] = 1;
1412 }
1413
1414 void
1415 tsetdirtattr(int attr) {
1416         int i, j;
1417
1418         for(i = 0; i < term.row-1; i++) {
1419                 for(j = 0; j < term.col-1; j++) {
1420                         if(term.line[i][j].mode & attr) {
1421                                 tsetdirt(i, i);
1422                                 break;
1423                         }
1424                 }
1425         }
1426 }
1427
1428 void
1429 tfulldirt(void) {
1430         tsetdirt(0, term.row-1);
1431 }
1432
1433 void
1434 tcursor(int mode) {
1435         static TCursor c[2];
1436         bool alt = IS_SET(MODE_ALTSCREEN);
1437
1438         if(mode == CURSOR_SAVE) {
1439                 c[alt] = term.c;
1440         } else if(mode == CURSOR_LOAD) {
1441                 term.c = c[alt];
1442                 tmoveto(c[alt].x, c[alt].y);
1443         }
1444 }
1445
1446 void
1447 treset(void) {
1448         uint i;
1449
1450         term.c = (TCursor){{
1451                 .mode = ATTR_NULL,
1452                 .fg = defaultfg,
1453                 .bg = defaultbg
1454         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1455
1456         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1457         for(i = tabspaces; i < term.col; i += tabspaces)
1458                 term.tabs[i] = 1;
1459         term.top = 0;
1460         term.bot = term.row - 1;
1461         term.mode = MODE_WRAP;
1462         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1463         term.charset = 0;
1464
1465         for(i = 0; i < 2; i++) {
1466                 tmoveto(0, 0);
1467                 tcursor(CURSOR_SAVE);
1468                 tclearregion(0, 0, term.col-1, term.row-1);
1469                 tswapscreen();
1470         }
1471 }
1472
1473 void
1474 tnew(int col, int row) {
1475         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1476         tresize(col, row);
1477         term.numlock = 1;
1478
1479         treset();
1480 }
1481
1482 void
1483 tswapscreen(void) {
1484         Line *tmp = term.line;
1485
1486         term.line = term.alt;
1487         term.alt = tmp;
1488         term.mode ^= MODE_ALTSCREEN;
1489         tfulldirt();
1490 }
1491
1492 void
1493 tscrolldown(int orig, int n) {
1494         int i;
1495         Line temp;
1496
1497         LIMIT(n, 0, term.bot-orig+1);
1498
1499         tsetdirt(orig, term.bot-n);
1500         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1501
1502         for(i = term.bot; i >= orig+n; i--) {
1503                 temp = term.line[i];
1504                 term.line[i] = term.line[i-n];
1505                 term.line[i-n] = temp;
1506         }
1507
1508         selscroll(orig, n);
1509 }
1510
1511 void
1512 tscrollup(int orig, int n) {
1513         int i;
1514         Line temp;
1515
1516         LIMIT(n, 0, term.bot-orig+1);
1517
1518         tclearregion(0, orig, term.col-1, orig+n-1);
1519         tsetdirt(orig+n, term.bot);
1520
1521         for(i = orig; i <= term.bot-n; i++) {
1522                 temp = term.line[i];
1523                 term.line[i] = term.line[i+n];
1524                 term.line[i+n] = temp;
1525         }
1526
1527         selscroll(orig, -n);
1528 }
1529
1530 void
1531 selscroll(int orig, int n) {
1532         if(sel.ob.x == -1)
1533                 return;
1534
1535         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1536                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1537                         selclear(NULL);
1538                         return;
1539                 }
1540                 if(sel.type == SEL_RECTANGULAR) {
1541                         if(sel.ob.y < term.top)
1542                                 sel.ob.y = term.top;
1543                         if(sel.oe.y > term.bot)
1544                                 sel.oe.y = term.bot;
1545                 } else {
1546                         if(sel.ob.y < term.top) {
1547                                 sel.ob.y = term.top;
1548                                 sel.ob.x = 0;
1549                         }
1550                         if(sel.oe.y > term.bot) {
1551                                 sel.oe.y = term.bot;
1552                                 sel.oe.x = term.col;
1553                         }
1554                 }
1555                 selnormalize();
1556         }
1557 }
1558
1559 void
1560 tnewline(int first_col) {
1561         int y = term.c.y;
1562
1563         if(y == term.bot) {
1564                 tscrollup(term.top, 1);
1565         } else {
1566                 y++;
1567         }
1568         tmoveto(first_col ? 0 : term.c.x, y);
1569 }
1570
1571 void
1572 csiparse(void) {
1573         char *p = csiescseq.buf, *np;
1574         long int v;
1575
1576         csiescseq.narg = 0;
1577         if(*p == '?') {
1578                 csiescseq.priv = 1;
1579                 p++;
1580         }
1581
1582         csiescseq.buf[csiescseq.len] = '\0';
1583         while(p < csiescseq.buf+csiescseq.len) {
1584                 np = NULL;
1585                 v = strtol(p, &np, 10);
1586                 if(np == p)
1587                         v = 0;
1588                 if(v == LONG_MAX || v == LONG_MIN)
1589                         v = -1;
1590                 csiescseq.arg[csiescseq.narg++] = v;
1591                 p = np;
1592                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1593                         break;
1594                 p++;
1595         }
1596         csiescseq.mode[0] = *p++;
1597         csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1598 }
1599
1600 /* for absolute user moves, when decom is set */
1601 void
1602 tmoveato(int x, int y) {
1603         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1604 }
1605
1606 void
1607 tmoveto(int x, int y) {
1608         int miny, maxy;
1609
1610         if(term.c.state & CURSOR_ORIGIN) {
1611                 miny = term.top;
1612                 maxy = term.bot;
1613         } else {
1614                 miny = 0;
1615                 maxy = term.row - 1;
1616         }
1617         term.c.state &= ~CURSOR_WRAPNEXT;
1618         term.c.x = LIMIT(x, 0, term.col-1);
1619         term.c.y = LIMIT(y, miny, maxy);
1620 }
1621
1622 void
1623 tsetchar(char *c, Glyph *attr, int x, int y) {
1624         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1625                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1626                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1627                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1628                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1629                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1630                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1631                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1632                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1633         };
1634
1635         /*
1636          * The table is proudly stolen from rxvt.
1637          */
1638         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1639                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1640                         c = vt100_0[c[0] - 0x41];
1641                 }
1642         }
1643
1644         if(term.line[y][x].mode & ATTR_WIDE) {
1645                 if(x+1 < term.col) {
1646                         term.line[y][x+1].c[0] = ' ';
1647                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1648                 }
1649         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1650                 term.line[y][x-1].c[0] = ' ';
1651                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1652         }
1653
1654         term.dirty[y] = 1;
1655         term.line[y][x] = *attr;
1656         memcpy(term.line[y][x].c, c, UTF_SIZ);
1657 }
1658
1659 void
1660 tclearregion(int x1, int y1, int x2, int y2) {
1661         int x, y, temp;
1662         Glyph *gp;
1663
1664         if(x1 > x2)
1665                 temp = x1, x1 = x2, x2 = temp;
1666         if(y1 > y2)
1667                 temp = y1, y1 = y2, y2 = temp;
1668
1669         LIMIT(x1, 0, term.col-1);
1670         LIMIT(x2, 0, term.col-1);
1671         LIMIT(y1, 0, term.row-1);
1672         LIMIT(y2, 0, term.row-1);
1673
1674         for(y = y1; y <= y2; y++) {
1675                 term.dirty[y] = 1;
1676                 for(x = x1; x <= x2; x++) {
1677                         gp = &term.line[y][x];
1678                         if(selected(x, y))
1679                                 selclear(NULL);
1680                         gp->fg = term.c.attr.fg;
1681                         gp->bg = term.c.attr.bg;
1682                         gp->mode = 0;
1683                         memcpy(gp->c, " ", 2);
1684                 }
1685         }
1686 }
1687
1688 void
1689 tdeletechar(int n) {
1690         int dst, src, size;
1691         Glyph *line;
1692
1693         LIMIT(n, 0, term.col - term.c.x);
1694
1695         dst = term.c.x;
1696         src = term.c.x + n;
1697         size = term.col - src;
1698         line = term.line[term.c.y];
1699
1700         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1701         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1702 }
1703
1704 void
1705 tinsertblank(int n) {
1706         int dst, src, size;
1707         Glyph *line;
1708
1709         LIMIT(n, 0, term.col - term.c.x);
1710
1711         dst = term.c.x + n;
1712         src = term.c.x;
1713         size = term.col - dst;
1714         line = term.line[term.c.y];
1715
1716         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1717         tclearregion(src, term.c.y, dst - 1, term.c.y);
1718 }
1719
1720 void
1721 tinsertblankline(int n) {
1722         if(BETWEEN(term.c.y, term.top, term.bot))
1723                 tscrolldown(term.c.y, n);
1724 }
1725
1726 void
1727 tdeleteline(int n) {
1728         if(BETWEEN(term.c.y, term.top, term.bot))
1729                 tscrollup(term.c.y, n);
1730 }
1731
1732 int32_t
1733 tdefcolor(int *attr, int *npar, int l) {
1734         int32_t idx = -1;
1735         uint r, g, b;
1736
1737         switch (attr[*npar + 1]) {
1738         case 2: /* direct color in RGB space */
1739                 if (*npar + 4 >= l) {
1740                         fprintf(stderr,
1741                                 "erresc(38): Incorrect number of parameters (%d)\n",
1742                                 *npar);
1743                         break;
1744                 }
1745                 r = attr[*npar + 2];
1746                 g = attr[*npar + 3];
1747                 b = attr[*npar + 4];
1748                 *npar += 4;
1749                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1750                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1751                                 r, g, b);
1752                 else
1753                         idx = TRUECOLOR(r, g, b);
1754                 break;
1755         case 5: /* indexed color */
1756                 if (*npar + 2 >= l) {
1757                         fprintf(stderr,
1758                                 "erresc(38): Incorrect number of parameters (%d)\n",
1759                                 *npar);
1760                         break;
1761                 }
1762                 *npar += 2;
1763                 if(!BETWEEN(attr[*npar], 0, 255))
1764                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1765                 else
1766                         idx = attr[*npar];
1767                 break;
1768         case 0: /* implemented defined (only foreground) */
1769         case 1: /* transparent */
1770         case 3: /* direct color in CMY space */
1771         case 4: /* direct color in CMYK space */
1772         default:
1773                 fprintf(stderr,
1774                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1775                 break;
1776         }
1777
1778         return idx;
1779 }
1780
1781 void
1782 tsetattr(int *attr, int l) {
1783         int i;
1784         int32_t idx;
1785
1786         for(i = 0; i < l; i++) {
1787                 switch(attr[i]) {
1788                 case 0:
1789                         term.c.attr.mode &= ~(
1790                                 ATTR_BOLD       |
1791                                 ATTR_FAINT      |
1792                                 ATTR_ITALIC     |
1793                                 ATTR_UNDERLINE  |
1794                                 ATTR_BLINK      |
1795                                 ATTR_REVERSE    |
1796                                 ATTR_INVISIBLE  |
1797                                 ATTR_STRUCK     );
1798                         term.c.attr.fg = defaultfg;
1799                         term.c.attr.bg = defaultbg;
1800                         break;
1801                 case 1:
1802                         term.c.attr.mode |= ATTR_BOLD;
1803                         break;
1804                 case 2:
1805                         term.c.attr.mode |= ATTR_FAINT;
1806                         break;
1807                 case 3:
1808                         term.c.attr.mode |= ATTR_ITALIC;
1809                         break;
1810                 case 4:
1811                         term.c.attr.mode |= ATTR_UNDERLINE;
1812                         break;
1813                 case 5: /* slow blink */
1814                         /* FALLTHROUGH */
1815                 case 6: /* rapid blink */
1816                         term.c.attr.mode |= ATTR_BLINK;
1817                         break;
1818                 case 7:
1819                         term.c.attr.mode |= ATTR_REVERSE;
1820                         break;
1821                 case 8:
1822                         term.c.attr.mode |= ATTR_INVISIBLE;
1823                         break;
1824                 case 9:
1825                         term.c.attr.mode |= ATTR_STRUCK;
1826                         break;
1827                 case 22:
1828                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1829                         break;
1830                 case 23:
1831                         term.c.attr.mode &= ~ATTR_ITALIC;
1832                         break;
1833                 case 24:
1834                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1835                         break;
1836                 case 25:
1837                         term.c.attr.mode &= ~ATTR_BLINK;
1838                         break;
1839                 case 27:
1840                         term.c.attr.mode &= ~ATTR_REVERSE;
1841                         break;
1842                 case 28:
1843                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1844                         break;
1845                 case 29:
1846                         term.c.attr.mode &= ~ATTR_STRUCK;
1847                         break;
1848                 case 38:
1849                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1850                                 term.c.attr.fg = idx;
1851                         break;
1852                 case 39:
1853                         term.c.attr.fg = defaultfg;
1854                         break;
1855                 case 48:
1856                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1857                                 term.c.attr.bg = idx;
1858                         break;
1859                 case 49:
1860                         term.c.attr.bg = defaultbg;
1861                         break;
1862                 default:
1863                         if(BETWEEN(attr[i], 30, 37)) {
1864                                 term.c.attr.fg = attr[i] - 30;
1865                         } else if(BETWEEN(attr[i], 40, 47)) {
1866                                 term.c.attr.bg = attr[i] - 40;
1867                         } else if(BETWEEN(attr[i], 90, 97)) {
1868                                 term.c.attr.fg = attr[i] - 90 + 8;
1869                         } else if(BETWEEN(attr[i], 100, 107)) {
1870                                 term.c.attr.bg = attr[i] - 100 + 8;
1871                         } else {
1872                                 fprintf(stderr,
1873                                         "erresc(default): gfx attr %d unknown\n",
1874                                         attr[i]), csidump();
1875                         }
1876                         break;
1877                 }
1878         }
1879 }
1880
1881 void
1882 tsetscroll(int t, int b) {
1883         int temp;
1884
1885         LIMIT(t, 0, term.row-1);
1886         LIMIT(b, 0, term.row-1);
1887         if(t > b) {
1888                 temp = t;
1889                 t = b;
1890                 b = temp;
1891         }
1892         term.top = t;
1893         term.bot = b;
1894 }
1895
1896 void
1897 tsetmode(bool priv, bool set, int *args, int narg) {
1898         int *lim, mode;
1899         bool alt;
1900
1901         for(lim = args + narg; args < lim; ++args) {
1902                 if(priv) {
1903                         switch(*args) {
1904                         case 1: /* DECCKM -- Cursor key */
1905                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1906                                 break;
1907                         case 5: /* DECSCNM -- Reverse video */
1908                                 mode = term.mode;
1909                                 MODBIT(term.mode, set, MODE_REVERSE);
1910                                 if(mode != term.mode)
1911                                         redraw();
1912                                 break;
1913                         case 6: /* DECOM -- Origin */
1914                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1915                                 tmoveato(0, 0);
1916                                 break;
1917                         case 7: /* DECAWM -- Auto wrap */
1918                                 MODBIT(term.mode, set, MODE_WRAP);
1919                                 break;
1920                         case 0:  /* Error (IGNORED) */
1921                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1922                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1923                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1924                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1925                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1926                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1927                         case 42: /* DECNRCM -- National characters (IGNORED) */
1928                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1929                                 break;
1930                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1931                                 MODBIT(term.mode, !set, MODE_HIDE);
1932                                 break;
1933                         case 9:    /* X10 mouse compatibility mode */
1934                                 xsetpointermotion(0);
1935                                 MODBIT(term.mode, 0, MODE_MOUSE);
1936                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1937                                 break;
1938                         case 1000: /* 1000: report button press */
1939                                 xsetpointermotion(0);
1940                                 MODBIT(term.mode, 0, MODE_MOUSE);
1941                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1942                                 break;
1943                         case 1002: /* 1002: report motion on button press */
1944                                 xsetpointermotion(0);
1945                                 MODBIT(term.mode, 0, MODE_MOUSE);
1946                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1947                                 break;
1948                         case 1003: /* 1003: enable all mouse motions */
1949                                 xsetpointermotion(set);
1950                                 MODBIT(term.mode, 0, MODE_MOUSE);
1951                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1952                                 break;
1953                         case 1004: /* 1004: send focus events to tty */
1954                                 MODBIT(term.mode, set, MODE_FOCUS);
1955                                 break;
1956                         case 1006: /* 1006: extended reporting mode */
1957                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1958                                 break;
1959                         case 1034:
1960                                 MODBIT(term.mode, set, MODE_8BIT);
1961                                 break;
1962                         case 1049: /* swap screen & set/restore cursor as xterm */
1963                                 if (!allowaltscreen)
1964                                         break;
1965                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1966                                 /* FALLTHROUGH */
1967                         case 47: /* swap screen */
1968                         case 1047:
1969                                 if (!allowaltscreen)
1970                                         break;
1971                                 alt = IS_SET(MODE_ALTSCREEN);
1972                                 if(alt) {
1973                                         tclearregion(0, 0, term.col-1,
1974                                                         term.row-1);
1975                                 }
1976                                 if(set ^ alt) /* set is always 1 or 0 */
1977                                         tswapscreen();
1978                                 if(*args != 1049)
1979                                         break;
1980                                 /* FALLTHROUGH */
1981                         case 1048:
1982                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1983                                 break;
1984                         case 2004: /* 2004: bracketed paste mode */
1985                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1986                                 break;
1987                         /* Not implemented mouse modes. See comments there. */
1988                         case 1001: /* mouse highlight mode; can hang the
1989                                       terminal by design when implemented. */
1990                         case 1005: /* UTF-8 mouse mode; will confuse
1991                                       applications not supporting UTF-8
1992                                       and luit. */
1993                         case 1015: /* urxvt mangled mouse mode; incompatible
1994                                       and can be mistaken for other control
1995                                       codes. */
1996                         default:
1997                                 fprintf(stderr,
1998                                         "erresc: unknown private set/reset mode %d\n",
1999                                         *args);
2000                                 break;
2001                         }
2002                 } else {
2003                         switch(*args) {
2004                         case 0:  /* Error (IGNORED) */
2005                                 break;
2006                         case 2:  /* KAM -- keyboard action */
2007                                 MODBIT(term.mode, set, MODE_KBDLOCK);
2008                                 break;
2009                         case 4:  /* IRM -- Insertion-replacement */
2010                                 MODBIT(term.mode, set, MODE_INSERT);
2011                                 break;
2012                         case 12: /* SRM -- Send/Receive */
2013                                 MODBIT(term.mode, !set, MODE_ECHO);
2014                                 break;
2015                         case 20: /* LNM -- Linefeed/new line */
2016                                 MODBIT(term.mode, set, MODE_CRLF);
2017                                 break;
2018                         default:
2019                                 fprintf(stderr,
2020                                         "erresc: unknown set/reset mode %d\n",
2021                                         *args);
2022                                 break;
2023                         }
2024                 }
2025         }
2026 }
2027
2028 void
2029 csihandle(void) {
2030         char buf[40];
2031         int len;
2032
2033         switch(csiescseq.mode[0]) {
2034         default:
2035         unknown:
2036                 fprintf(stderr, "erresc: unknown csi ");
2037                 csidump();
2038                 /* die(""); */
2039                 break;
2040         case '@': /* ICH -- Insert <n> blank char */
2041                 DEFAULT(csiescseq.arg[0], 1);
2042                 tinsertblank(csiescseq.arg[0]);
2043                 break;
2044         case 'A': /* CUU -- Cursor <n> Up */
2045                 DEFAULT(csiescseq.arg[0], 1);
2046                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
2047                 break;
2048         case 'B': /* CUD -- Cursor <n> Down */
2049         case 'e': /* VPR --Cursor <n> Down */
2050                 DEFAULT(csiescseq.arg[0], 1);
2051                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
2052                 break;
2053         case 'i': /* MC -- Media Copy */
2054                 switch(csiescseq.arg[0]) {
2055                 case 0:
2056                         tdump();
2057                         break;
2058                 case 1:
2059                         tdumpline(term.c.y);
2060                         break;
2061                 case 2:
2062                         tdumpsel();
2063                         break;
2064                 case 4:
2065                         term.mode &= ~MODE_PRINT;
2066                         break;
2067                 case 5:
2068                         term.mode |= MODE_PRINT;
2069                         break;
2070                 }
2071                 break;
2072         case 'c': /* DA -- Device Attributes */
2073                 if(csiescseq.arg[0] == 0)
2074                         ttywrite(vtiden, sizeof(vtiden) - 1);
2075                 break;
2076         case 'C': /* CUF -- Cursor <n> Forward */
2077         case 'a': /* HPR -- Cursor <n> Forward */
2078                 DEFAULT(csiescseq.arg[0], 1);
2079                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
2080                 break;
2081         case 'D': /* CUB -- Cursor <n> Backward */
2082                 DEFAULT(csiescseq.arg[0], 1);
2083                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2084                 break;
2085         case 'E': /* CNL -- Cursor <n> Down and first col */
2086                 DEFAULT(csiescseq.arg[0], 1);
2087                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2088                 break;
2089         case 'F': /* CPL -- Cursor <n> Up and first col */
2090                 DEFAULT(csiescseq.arg[0], 1);
2091                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2092                 break;
2093         case 'g': /* TBC -- Tabulation clear */
2094                 switch(csiescseq.arg[0]) {
2095                 case 0: /* clear current tab stop */
2096                         term.tabs[term.c.x] = 0;
2097                         break;
2098                 case 3: /* clear all the tabs */
2099                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2100                         break;
2101                 default:
2102                         goto unknown;
2103                 }
2104                 break;
2105         case 'G': /* CHA -- Move to <col> */
2106         case '`': /* HPA */
2107                 DEFAULT(csiescseq.arg[0], 1);
2108                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2109                 break;
2110         case 'H': /* CUP -- Move to <row> <col> */
2111         case 'f': /* HVP */
2112                 DEFAULT(csiescseq.arg[0], 1);
2113                 DEFAULT(csiescseq.arg[1], 1);
2114                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2115                 break;
2116         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2117                 DEFAULT(csiescseq.arg[0], 1);
2118                 tputtab(csiescseq.arg[0]);
2119                 break;
2120         case 'J': /* ED -- Clear screen */
2121                 selclear(NULL);
2122                 switch(csiescseq.arg[0]) {
2123                 case 0: /* below */
2124                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2125                         if(term.c.y < term.row-1) {
2126                                 tclearregion(0, term.c.y+1, term.col-1,
2127                                                 term.row-1);
2128                         }
2129                         break;
2130                 case 1: /* above */
2131                         if(term.c.y > 1)
2132                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2133                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2134                         break;
2135                 case 2: /* all */
2136                         tclearregion(0, 0, term.col-1, term.row-1);
2137                         break;
2138                 default:
2139                         goto unknown;
2140                 }
2141                 break;
2142         case 'K': /* EL -- Clear line */
2143                 switch(csiescseq.arg[0]) {
2144                 case 0: /* right */
2145                         tclearregion(term.c.x, term.c.y, term.col-1,
2146                                         term.c.y);
2147                         break;
2148                 case 1: /* left */
2149                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2150                         break;
2151                 case 2: /* all */
2152                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2153                         break;
2154                 }
2155                 break;
2156         case 'S': /* SU -- Scroll <n> line up */
2157                 DEFAULT(csiescseq.arg[0], 1);
2158                 tscrollup(term.top, csiescseq.arg[0]);
2159                 break;
2160         case 'T': /* SD -- Scroll <n> line down */
2161                 DEFAULT(csiescseq.arg[0], 1);
2162                 tscrolldown(term.top, csiescseq.arg[0]);
2163                 break;
2164         case 'L': /* IL -- Insert <n> blank lines */
2165                 DEFAULT(csiescseq.arg[0], 1);
2166                 tinsertblankline(csiescseq.arg[0]);
2167                 break;
2168         case 'l': /* RM -- Reset Mode */
2169                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2170                 break;
2171         case 'M': /* DL -- Delete <n> lines */
2172                 DEFAULT(csiescseq.arg[0], 1);
2173                 tdeleteline(csiescseq.arg[0]);
2174                 break;
2175         case 'X': /* ECH -- Erase <n> char */
2176                 DEFAULT(csiescseq.arg[0], 1);
2177                 tclearregion(term.c.x, term.c.y,
2178                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2179                 break;
2180         case 'P': /* DCH -- Delete <n> char */
2181                 DEFAULT(csiescseq.arg[0], 1);
2182                 tdeletechar(csiescseq.arg[0]);
2183                 break;
2184         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2185                 DEFAULT(csiescseq.arg[0], 1);
2186                 tputtab(-csiescseq.arg[0]);
2187                 break;
2188         case 'd': /* VPA -- Move to <row> */
2189                 DEFAULT(csiescseq.arg[0], 1);
2190                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2191                 break;
2192         case 'h': /* SM -- Set terminal mode */
2193                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2194                 break;
2195         case 'm': /* SGR -- Terminal attribute (color) */
2196                 tsetattr(csiescseq.arg, csiescseq.narg);
2197                 break;
2198         case 'n': /* DSR – Device Status Report (cursor position) */
2199                 if (csiescseq.arg[0] == 6) {
2200                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2201                                         term.c.y+1, term.c.x+1);
2202                         ttywrite(buf, len);
2203                 }
2204                 break;
2205         case 'r': /* DECSTBM -- Set Scrolling Region */
2206                 if(csiescseq.priv) {
2207                         goto unknown;
2208                 } else {
2209                         DEFAULT(csiescseq.arg[0], 1);
2210                         DEFAULT(csiescseq.arg[1], term.row);
2211                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2212                         tmoveato(0, 0);
2213                 }
2214                 break;
2215         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2216                 tcursor(CURSOR_SAVE);
2217                 break;
2218         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2219                 tcursor(CURSOR_LOAD);
2220                 break;
2221         case ' ':
2222                 switch (csiescseq.mode[1]) {
2223                         case 'q': /* DECSCUSR -- Set Cursor Style */
2224                                 DEFAULT(csiescseq.arg[0], 1);
2225                                 if (!BETWEEN(csiescseq.arg[0], 0, 6)) {
2226                                         goto unknown;
2227                                 }
2228                                 xw.cursor = csiescseq.arg[0];
2229                                 break;
2230                         default:
2231                                 goto unknown;
2232                 }
2233                 break;
2234         }
2235 }
2236
2237 void
2238 csidump(void) {
2239         int i;
2240         uint c;
2241
2242         printf("ESC[");
2243         for(i = 0; i < csiescseq.len; i++) {
2244                 c = csiescseq.buf[i] & 0xff;
2245                 if(isprint(c)) {
2246                         putchar(c);
2247                 } else if(c == '\n') {
2248                         printf("(\\n)");
2249                 } else if(c == '\r') {
2250                         printf("(\\r)");
2251                 } else if(c == 0x1b) {
2252                         printf("(\\e)");
2253                 } else {
2254                         printf("(%02x)", c);
2255                 }
2256         }
2257         putchar('\n');
2258 }
2259
2260 void
2261 csireset(void) {
2262         memset(&csiescseq, 0, sizeof(csiescseq));
2263 }
2264
2265 void
2266 strhandle(void) {
2267         char *p = NULL;
2268         int j, narg, par;
2269
2270         term.esc &= ~(ESC_STR_END|ESC_STR);
2271         strparse();
2272         narg = strescseq.narg;
2273         par = atoi(strescseq.args[0]);
2274
2275         switch(strescseq.type) {
2276         case ']': /* OSC -- Operating System Command */
2277                 switch(par) {
2278                 case 0:
2279                 case 1:
2280                 case 2:
2281                         if(narg > 1)
2282                                 xsettitle(strescseq.args[1]);
2283                         return;
2284                 case 4: /* color set */
2285                         if(narg < 3)
2286                                 break;
2287                         p = strescseq.args[2];
2288                         /* FALLTHROUGH */
2289                 case 104: /* color reset, here p = NULL */
2290                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2291                         if(xsetcolorname(j, p)) {
2292                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2293                         } else {
2294                                 /*
2295                                  * TODO if defaultbg color is changed, borders
2296                                  * are dirty
2297                                  */
2298                                 redraw();
2299                         }
2300                         return;
2301                 }
2302                 break;
2303         case 'k': /* old title set compatibility */
2304                 xsettitle(strescseq.args[0]);
2305                 return;
2306         case 'P': /* DCS -- Device Control String */
2307         case '_': /* APC -- Application Program Command */
2308         case '^': /* PM -- Privacy Message */
2309                 return;
2310         }
2311
2312         fprintf(stderr, "erresc: unknown str ");
2313         strdump();
2314 }
2315
2316 void
2317 strparse(void) {
2318         int c;
2319         char *p = strescseq.buf;
2320
2321         strescseq.narg = 0;
2322         strescseq.buf[strescseq.len] = '\0';
2323
2324         if(*p == '\0')
2325                 return;
2326
2327         while(strescseq.narg < STR_ARG_SIZ) {
2328                 strescseq.args[strescseq.narg++] = p;
2329                 while((c = *p) != ';' && c != '\0')
2330                         ++p;
2331                 if(c == '\0')
2332                         return;
2333                 *p++ = '\0';
2334         }
2335 }
2336
2337 void
2338 strdump(void) {
2339         int i;
2340         uint c;
2341
2342         printf("ESC%c", strescseq.type);
2343         for(i = 0; i < strescseq.len; i++) {
2344                 c = strescseq.buf[i] & 0xff;
2345                 if(c == '\0') {
2346                         return;
2347                 } else if(isprint(c)) {
2348                         putchar(c);
2349                 } else if(c == '\n') {
2350                         printf("(\\n)");
2351                 } else if(c == '\r') {
2352                         printf("(\\r)");
2353                 } else if(c == 0x1b) {
2354                         printf("(\\e)");
2355                 } else {
2356                         printf("(%02x)", c);
2357                 }
2358         }
2359         printf("ESC\\\n");
2360 }
2361
2362 void
2363 strreset(void) {
2364         memset(&strescseq, 0, sizeof(strescseq));
2365 }
2366
2367 void
2368 tprinter(char *s, size_t len) {
2369         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2370                 fprintf(stderr, "Error writing in %s:%s\n",
2371                         opt_io, strerror(errno));
2372                 close(iofd);
2373                 iofd = -1;
2374         }
2375 }
2376
2377 void
2378 toggleprinter(const Arg *arg) {
2379         term.mode ^= MODE_PRINT;
2380 }
2381
2382 void
2383 printscreen(const Arg *arg) {
2384         tdump();
2385 }
2386
2387 void
2388 printsel(const Arg *arg) {
2389         tdumpsel();
2390 }
2391
2392 void
2393 tdumpsel(void) {
2394         char *ptr;
2395
2396         if((ptr = getsel())) {
2397                 tprinter(ptr, strlen(ptr));
2398                 free(ptr);
2399         }
2400 }
2401
2402 void
2403 tdumpline(int n) {
2404         Glyph *bp, *end;
2405
2406         bp = &term.line[n][0];
2407         end = &bp[MIN(tlinelen(n), term.col) - 1];
2408         if(bp != end || bp->c[0] != ' ') {
2409                 for( ;bp <= end; ++bp)
2410                         tprinter(bp->c, utf8len(bp->c));
2411         }
2412         tprinter("\n", 1);
2413 }
2414
2415 void
2416 tdump(void) {
2417         int i;
2418
2419         for(i = 0; i < term.row; ++i)
2420                 tdumpline(i);
2421 }
2422
2423 void
2424 tputtab(int n) {
2425         uint x = term.c.x;
2426
2427         if(n > 0) {
2428                 while(x < term.col && n--)
2429                         for(++x; x < term.col && !term.tabs[x]; ++x)
2430                                 /* nothing */ ;
2431         } else if(n < 0) {
2432                 while(x > 0 && n++)
2433                         for(--x; x > 0 && !term.tabs[x]; --x)
2434                                 /* nothing */ ;
2435         }
2436         term.c.x = LIMIT(x, 0, term.col-1);
2437 }
2438
2439 void
2440 techo(char *buf, int len) {
2441         for(; len > 0; buf++, len--) {
2442                 char c = *buf;
2443
2444                 if(ISCONTROL((uchar) c)) { /* control code */
2445                         if(c & 0x80) {
2446                                 c &= 0x7f;
2447                                 tputc("^", 1);
2448                                 tputc("[", 1);
2449                         } else if(c != '\n' && c != '\r' && c != '\t') {
2450                                 c ^= 0x40;
2451                                 tputc("^", 1);
2452                         }
2453                         tputc(&c, 1);
2454                 } else {
2455                         break;
2456                 }
2457         }
2458         if(len)
2459                 tputc(buf, len);
2460 }
2461
2462 void
2463 tdeftran(char ascii) {
2464         static char cs[] = "0B";
2465         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2466         char *p;
2467
2468         if((p = strchr(cs, ascii)) == NULL) {
2469                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2470         } else {
2471                 term.trantbl[term.icharset] = vcs[p - cs];
2472         }
2473 }
2474
2475 void
2476 tdectest(char c) {
2477         static char E[UTF_SIZ] = "E";
2478         int x, y;
2479
2480         if(c == '8') { /* DEC screen alignment test. */
2481                 for(x = 0; x < term.col; ++x) {
2482                         for(y = 0; y < term.row; ++y)
2483                                 tsetchar(E, &term.c.attr, x, y);
2484                 }
2485         }
2486 }
2487
2488 void
2489 tstrsequence(uchar c) {
2490         switch (c) {
2491         case 0x90:   /* DCS -- Device Control String */
2492                 c = 'P';
2493                 break;
2494         case 0x9f:   /* APC -- Application Program Command */
2495                 c = '_';
2496                 break;
2497         case 0x9e:   /* PM -- Privacy Message */
2498                 c = '^';
2499                 break;
2500         case 0x9d:   /* OSC -- Operating System Command */
2501                 c = ']';
2502                 break;
2503         }
2504         strreset();
2505         strescseq.type = c;
2506         term.esc |= ESC_STR;
2507 }
2508
2509 void
2510 tcontrolcode(uchar ascii) {
2511         static char question[UTF_SIZ] = "?";
2512
2513         switch(ascii) {
2514         case '\t':   /* HT */
2515                 tputtab(1);
2516                 return;
2517         case '\b':   /* BS */
2518                 tmoveto(term.c.x-1, term.c.y);
2519                 return;
2520         case '\r':   /* CR */
2521                 tmoveto(0, term.c.y);
2522                 return;
2523         case '\f':   /* LF */
2524         case '\v':   /* VT */
2525         case '\n':   /* LF */
2526                 /* go to first col if the mode is set */
2527                 tnewline(IS_SET(MODE_CRLF));
2528                 return;
2529         case '\a':   /* BEL */
2530                 if(term.esc & ESC_STR_END) {
2531                         /* backwards compatibility to xterm */
2532                         strhandle();
2533                 } else {
2534                         if(!(xw.state & WIN_FOCUSED))
2535                                 xseturgency(1);
2536                         if (bellvolume)
2537                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2538                 }
2539                 break;
2540         case '\033': /* ESC */
2541                 csireset();
2542                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2543                 term.esc |= ESC_START;
2544                 return;
2545         case '\016': /* SO (LS1 -- Locking shift 1) */
2546         case '\017': /* SI (LS0 -- Locking shift 0) */
2547                 term.charset = 1 - (ascii - '\016');
2548                 return;
2549         case '\032': /* SUB */
2550                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2551         case '\030': /* CAN */
2552                 csireset();
2553                 break;
2554         case '\005': /* ENQ (IGNORED) */
2555         case '\000': /* NUL (IGNORED) */
2556         case '\021': /* XON (IGNORED) */
2557         case '\023': /* XOFF (IGNORED) */
2558         case 0177:   /* DEL (IGNORED) */
2559                 return;
2560         case 0x84:   /* TODO: IND */
2561                 break;
2562         case 0x85:   /* NEL -- Next line */
2563                 tnewline(1); /* always go to first col */
2564                 break;
2565         case 0x88:   /* HTS -- Horizontal tab stop */
2566                 term.tabs[term.c.x] = 1;
2567                 break;
2568         case 0x8d:   /* TODO: RI */
2569         case 0x8e:   /* TODO: SS2 */
2570         case 0x8f:   /* TODO: SS3 */
2571         case 0x98:   /* TODO: SOS */
2572                 break;
2573         case 0x9a:   /* DECID -- Identify Terminal */
2574                 ttywrite(vtiden, sizeof(vtiden) - 1);
2575                 break;
2576         case 0x9b:   /* TODO: CSI */
2577         case 0x9c:   /* TODO: ST */
2578                 break;
2579         case 0x90:   /* DCS -- Device Control String */
2580         case 0x9f:   /* APC -- Application Program Command */
2581         case 0x9e:   /* PM -- Privacy Message */
2582         case 0x9d:   /* OSC -- Operating System Command */
2583                 tstrsequence(ascii);
2584                 return;
2585         }
2586         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2587         term.esc &= ~(ESC_STR_END|ESC_STR);
2588 }
2589
2590 /*
2591  * returns 1 when the sequence is finished and it hasn't to read
2592  * more characters for this sequence, otherwise 0
2593  */
2594 int
2595 eschandle(uchar ascii) {
2596         switch(ascii) {
2597         case '[':
2598                 term.esc |= ESC_CSI;
2599                 return 0;
2600         case '#':
2601                 term.esc |= ESC_TEST;
2602                 return 0;
2603         case 'P': /* DCS -- Device Control String */
2604         case '_': /* APC -- Application Program Command */
2605         case '^': /* PM -- Privacy Message */
2606         case ']': /* OSC -- Operating System Command */
2607         case 'k': /* old title set compatibility */
2608                 tstrsequence(ascii);
2609                 return 0;
2610         case 'n': /* LS2 -- Locking shift 2 */
2611         case 'o': /* LS3 -- Locking shift 3 */
2612                 term.charset = 2 + (ascii - 'n');
2613                 break;
2614         case '(': /* GZD4 -- set primary charset G0 */
2615         case ')': /* G1D4 -- set secondary charset G1 */
2616         case '*': /* G2D4 -- set tertiary charset G2 */
2617         case '+': /* G3D4 -- set quaternary charset G3 */
2618                 term.icharset = ascii - '(';
2619                 term.esc |= ESC_ALTCHARSET;
2620                 return 0;
2621         case 'D': /* IND -- Linefeed */
2622                 if(term.c.y == term.bot) {
2623                         tscrollup(term.top, 1);
2624                 } else {
2625                         tmoveto(term.c.x, term.c.y+1);
2626                 }
2627                 break;
2628         case 'E': /* NEL -- Next line */
2629                 tnewline(1); /* always go to first col */
2630                 break;
2631         case 'H': /* HTS -- Horizontal tab stop */
2632                 term.tabs[term.c.x] = 1;
2633                 break;
2634         case 'M': /* RI -- Reverse index */
2635                 if(term.c.y == term.top) {
2636                         tscrolldown(term.top, 1);
2637                 } else {
2638                         tmoveto(term.c.x, term.c.y-1);
2639                 }
2640                 break;
2641         case 'Z': /* DECID -- Identify Terminal */
2642                 ttywrite(vtiden, sizeof(vtiden) - 1);
2643                 break;
2644         case 'c': /* RIS -- Reset to inital state */
2645                 treset();
2646                 xresettitle();
2647                 xloadcols();
2648                 break;
2649         case '=': /* DECPAM -- Application keypad */
2650                 term.mode |= MODE_APPKEYPAD;
2651                 break;
2652         case '>': /* DECPNM -- Normal keypad */
2653                 term.mode &= ~MODE_APPKEYPAD;
2654                 break;
2655         case '7': /* DECSC -- Save Cursor */
2656                 tcursor(CURSOR_SAVE);
2657                 break;
2658         case '8': /* DECRC -- Restore Cursor */
2659                 tcursor(CURSOR_LOAD);
2660                 break;
2661         case '\\': /* ST -- String Terminator */
2662                 if(term.esc & ESC_STR_END)
2663                         strhandle();
2664                 break;
2665         default:
2666                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2667                         (uchar) ascii, isprint(ascii)? ascii:'.');
2668                 break;
2669         }
2670         return 1;
2671 }
2672
2673 void
2674 tputc(char *c, int len) {
2675         uchar ascii;
2676         bool control;
2677         long unicodep;
2678         int width;
2679         Glyph *gp;
2680
2681         if(len == 1) {
2682                 width = 1;
2683                 unicodep = ascii = *c;
2684         } else {
2685                 utf8decode(c, &unicodep, UTF_SIZ);
2686                 if ((width = wcwidth(unicodep)) == -1) {
2687                         c = "\357\277\275";     /* UTF_INVALID */
2688                         width = 1;
2689                 }
2690                 ascii = unicodep;
2691         }
2692
2693         if(IS_SET(MODE_PRINT))
2694                 tprinter(c, len);
2695         control = ISCONTROL(unicodep);
2696
2697         /*
2698          * STR sequence must be checked before anything else
2699          * because it uses all following characters until it
2700          * receives a ESC, a SUB, a ST or any other C1 control
2701          * character.
2702          */
2703         if(term.esc & ESC_STR) {
2704                 if(len == 1 &&
2705                    (ascii == '\a' || ascii == 030 ||
2706                     ascii == 032  || ascii == 033 ||
2707                     ISCONTROLC1(unicodep))) {
2708                         term.esc &= ~(ESC_START|ESC_STR);
2709                         term.esc |= ESC_STR_END;
2710                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2711                         memmove(&strescseq.buf[strescseq.len], c, len);
2712                         strescseq.len += len;
2713                         return;
2714                 } else {
2715                 /*
2716                  * Here is a bug in terminals. If the user never sends
2717                  * some code to stop the str or esc command, then st
2718                  * will stop responding. But this is better than
2719                  * silently failing with unknown characters. At least
2720                  * then users will report back.
2721                  *
2722                  * In the case users ever get fixed, here is the code:
2723                  */
2724                 /*
2725                  * term.esc = 0;
2726                  * strhandle();
2727                  */
2728                         return;
2729                 }
2730         }
2731
2732         /*
2733          * Actions of control codes must be performed as soon they arrive
2734          * because they can be embedded inside a control sequence, and
2735          * they must not cause conflicts with sequences.
2736          */
2737         if(control) {
2738                 tcontrolcode(ascii);
2739                 /*
2740                  * control codes are not shown ever
2741                  */
2742                 return;
2743         } else if(term.esc & ESC_START) {
2744                 if(term.esc & ESC_CSI) {
2745                         csiescseq.buf[csiescseq.len++] = ascii;
2746                         if(BETWEEN(ascii, 0x40, 0x7E)
2747                                         || csiescseq.len >= \
2748                                         sizeof(csiescseq.buf)-1) {
2749                                 term.esc = 0;
2750                                 csiparse();
2751                                 csihandle();
2752                         }
2753                         return;
2754                 } else if(term.esc & ESC_ALTCHARSET) {
2755                         tdeftran(ascii);
2756                 } else if(term.esc & ESC_TEST) {
2757                         tdectest(ascii);
2758                 } else {
2759                         if (!eschandle(ascii))
2760                                 return;
2761                         /* sequence already finished */
2762                 }
2763                 term.esc = 0;
2764                 /*
2765                  * All characters which form part of a sequence are not
2766                  * printed
2767                  */
2768                 return;
2769         }
2770         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2771                 selclear(NULL);
2772
2773         gp = &term.line[term.c.y][term.c.x];
2774         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2775                 gp->mode |= ATTR_WRAP;
2776                 tnewline(1);
2777                 gp = &term.line[term.c.y][term.c.x];
2778         }
2779
2780         if(IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2781                 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2782
2783         if(term.c.x+width > term.col) {
2784                 tnewline(1);
2785                 gp = &term.line[term.c.y][term.c.x];
2786         }
2787
2788         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2789
2790         if(width == 2) {
2791                 gp->mode |= ATTR_WIDE;
2792                 if(term.c.x+1 < term.col) {
2793                         gp[1].c[0] = '\0';
2794                         gp[1].mode = ATTR_WDUMMY;
2795                 }
2796         }
2797         if(term.c.x+width < term.col) {
2798                 tmoveto(term.c.x+width, term.c.y);
2799         } else {
2800                 term.c.state |= CURSOR_WRAPNEXT;
2801         }
2802 }
2803
2804 void
2805 tresize(int col, int row) {
2806         int i;
2807         int minrow = MIN(row, term.row);
2808         int mincol = MIN(col, term.col);
2809         bool *bp;
2810         TCursor c;
2811
2812         if(col < 1 || row < 1) {
2813                 fprintf(stderr,
2814                         "tresize: error resizing to %dx%d\n", col, row);
2815                 return;
2816         }
2817
2818         /*
2819          * slide screen to keep cursor where we expect it -
2820          * tscrollup would work here, but we can optimize to
2821          * memmove because we're freeing the earlier lines
2822          */
2823         for(i = 0; i <= term.c.y - row; i++) {
2824                 free(term.line[i]);
2825                 free(term.alt[i]);
2826         }
2827         /* ensure that both src and dst are not NULL */
2828         if (i > 0) {
2829                 memmove(term.line, term.line + i, row * sizeof(Line));
2830                 memmove(term.alt, term.alt + i, row * sizeof(Line));
2831         }
2832         for(i += row; i < term.row; i++) {
2833                 free(term.line[i]);
2834                 free(term.alt[i]);
2835         }
2836
2837         /* resize to new height */
2838         term.line = xrealloc(term.line, row * sizeof(Line));
2839         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2840         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2841         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2842
2843         /* resize each row to new width, zero-pad if needed */
2844         for(i = 0; i < minrow; i++) {
2845                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2846                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2847         }
2848
2849         /* allocate any new rows */
2850         for(/* i == minrow */; i < row; i++) {
2851                 term.line[i] = xmalloc(col * sizeof(Glyph));
2852                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2853         }
2854         if(col > term.col) {
2855                 bp = term.tabs + term.col;
2856
2857                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2858                 while(--bp > term.tabs && !*bp)
2859                         /* nothing */ ;
2860                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2861                         *bp = 1;
2862         }
2863         /* update terminal size */
2864         term.col = col;
2865         term.row = row;
2866         /* reset scrolling region */
2867         tsetscroll(0, row-1);
2868         /* make use of the LIMIT in tmoveto */
2869         tmoveto(term.c.x, term.c.y);
2870         /* Clearing both screens (it makes dirty all lines) */
2871         c = term.c;
2872         for(i = 0; i < 2; i++) {
2873                 if(mincol < col && 0 < minrow) {
2874                         tclearregion(mincol, 0, col - 1, minrow - 1);
2875                 }
2876                 if(0 < col && minrow < row) {
2877                         tclearregion(0, minrow, col - 1, row - 1);
2878                 }
2879                 tswapscreen();
2880                 tcursor(CURSOR_LOAD);
2881         }
2882         term.c = c;
2883 }
2884
2885 void
2886 xresize(int col, int row) {
2887         xw.tw = MAX(1, col * xw.cw);
2888         xw.th = MAX(1, row * xw.ch);
2889
2890         XFreePixmap(xw.dpy, xw.buf);
2891         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2892                         DefaultDepth(xw.dpy, xw.scr));
2893         XftDrawChange(xw.draw, xw.buf);
2894         xclear(0, 0, xw.w, xw.h);
2895 }
2896
2897 ushort
2898 sixd_to_16bit(int x) {
2899         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2900 }
2901
2902 void
2903 xloadcols(void) {
2904         int i;
2905         XRenderColor color = { .alpha = 0xffff };
2906         static bool loaded;
2907         Color *cp;
2908
2909         if(loaded) {
2910                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2911                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2912         }
2913
2914         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2915         for(i = 0; i < LEN(colorname); i++) {
2916                 if(!colorname[i])
2917                         continue;
2918                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2919                         die("Could not allocate color '%s'\n", colorname[i]);
2920                 }
2921         }
2922
2923         /* load colors [16-231] ; same colors as xterm */
2924         for(i = 16; i < 6*6*6+16; i++) {
2925                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2926                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2927                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2928                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2929                         die("Could not allocate color %d\n", i);
2930         }
2931
2932         /* load colors [232-255] ; grayscale */
2933         for(; i < 256; i++) {
2934                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2935                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2936                         die("Could not allocate color %d\n", i);
2937         }
2938         loaded = true;
2939 }
2940
2941 int
2942 xsetcolorname(int x, const char *name) {
2943         XRenderColor color = { .alpha = 0xffff };
2944         Color ncolor;
2945
2946         if(!BETWEEN(x, 0, LEN(colorname)))
2947                 return 1;
2948
2949         if(!name) {
2950                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2951                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2952                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2953                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2954                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2955                                                 xw.cmap, &color, &ncolor)) {
2956                                 return 1;
2957                         }
2958
2959                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2960                         dc.col[x] = ncolor;
2961                         return 0;
2962                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2963                         color.red = color.green = color.blue = \
2964                                     0x0808 + 0x0a0a * (x - (16 + 216));
2965                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2966                                                 xw.cmap, &color, &ncolor)) {
2967                                 return 1;
2968                         }
2969
2970                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2971                         dc.col[x] = ncolor;
2972                         return 0;
2973                 } else { /* system colors */
2974                         name = colorname[x];
2975                 }
2976         }
2977         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2978                 return 1;
2979
2980         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2981         dc.col[x] = ncolor;
2982         return 0;
2983 }
2984
2985 void
2986 xtermclear(int col1, int row1, int col2, int row2) {
2987         XftDrawRect(xw.draw,
2988                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2989                         borderpx + col1 * xw.cw,
2990                         borderpx + row1 * xw.ch,
2991                         (col2-col1+1) * xw.cw,
2992                         (row2-row1+1) * xw.ch);
2993 }
2994
2995 /*
2996  * Absolute coordinates.
2997  */
2998 void
2999 xclear(int x1, int y1, int x2, int y2) {
3000         XftDrawRect(xw.draw,
3001                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
3002                         x1, y1, x2-x1, y2-y1);
3003 }
3004
3005 void
3006 xhints(void) {
3007         XClassHint class = {opt_class ? opt_class : termname, termname};
3008         XWMHints wm = {.flags = InputHint, .input = 1};
3009         XSizeHints *sizeh = NULL;
3010
3011         sizeh = XAllocSizeHints();
3012
3013         sizeh->flags = PSize | PResizeInc | PBaseSize;
3014         sizeh->height = xw.h;
3015         sizeh->width = xw.w;
3016         sizeh->height_inc = xw.ch;
3017         sizeh->width_inc = xw.cw;
3018         sizeh->base_height = 2 * borderpx;
3019         sizeh->base_width = 2 * borderpx;
3020         if(xw.isfixed == True) {
3021                 sizeh->flags |= PMaxSize | PMinSize;
3022                 sizeh->min_width = sizeh->max_width = xw.w;
3023                 sizeh->min_height = sizeh->max_height = xw.h;
3024         }
3025         if(xw.gm & (XValue|YValue)) {
3026                 sizeh->flags |= USPosition | PWinGravity;
3027                 sizeh->x = xw.l;
3028                 sizeh->y = xw.t;
3029                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
3030         }
3031
3032         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
3033                         &class);
3034         XFree(sizeh);
3035 }
3036
3037 int
3038 xgeommasktogravity(int mask) {
3039         switch(mask & (XNegative|YNegative)) {
3040         case 0:
3041                 return NorthWestGravity;
3042         case XNegative:
3043                 return NorthEastGravity;
3044         case YNegative:
3045                 return SouthWestGravity;
3046         }
3047         return SouthEastGravity;
3048 }
3049
3050 int
3051 xloadfont(Font *f, FcPattern *pattern) {
3052         FcPattern *match;
3053         FcResult result;
3054
3055         match = FcFontMatch(NULL, pattern, &result);
3056         if(!match)
3057                 return 1;
3058
3059         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
3060                 FcPatternDestroy(match);
3061                 return 1;
3062         }
3063
3064         f->set = NULL;
3065         f->pattern = FcPatternDuplicate(pattern);
3066
3067         f->ascent = f->match->ascent;
3068         f->descent = f->match->descent;
3069         f->lbearing = 0;
3070         f->rbearing = f->match->max_advance_width;
3071
3072         f->height = f->ascent + f->descent;
3073         f->width = f->lbearing + f->rbearing;
3074
3075         return 0;
3076 }
3077
3078 void
3079 xloadfonts(char *fontstr, double fontsize) {
3080         FcPattern *pattern;
3081         FcResult r_sz, r_psz;
3082         double fontval;
3083         float ceilf(float);
3084
3085         if(fontstr[0] == '-') {
3086                 pattern = XftXlfdParse(fontstr, False, False);
3087         } else {
3088                 pattern = FcNameParse((FcChar8 *)fontstr);
3089         }
3090
3091         if(!pattern)
3092                 die("st: can't open font %s\n", fontstr);
3093
3094         if(fontsize > 1) {
3095                 FcPatternDel(pattern, FC_PIXEL_SIZE);
3096                 FcPatternDel(pattern, FC_SIZE);
3097                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
3098                 usedfontsize = fontsize;
3099         } else {
3100                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
3101                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
3102                 if(r_psz == FcResultMatch) {
3103                         usedfontsize = fontval;
3104                 } else if(r_sz == FcResultMatch) {
3105                         usedfontsize = -1;
3106                 } else {
3107                         /*
3108                          * Default font size is 12, if none given. This is to
3109                          * have a known usedfontsize value.
3110                          */
3111                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3112                         usedfontsize = 12;
3113                 }
3114                 defaultfontsize = usedfontsize;
3115         }
3116
3117         FcConfigSubstitute(0, pattern, FcMatchPattern);
3118         FcDefaultSubstitute(pattern);
3119
3120         if(xloadfont(&dc.font, pattern))
3121                 die("st: can't open font %s\n", fontstr);
3122
3123         if(usedfontsize < 0) {
3124                 FcPatternGetDouble(dc.font.match->pattern,
3125                                    FC_PIXEL_SIZE, 0, &fontval);
3126                 usedfontsize = fontval;
3127                 if(fontsize == 0)
3128                         defaultfontsize = fontval;
3129         }
3130
3131         /* Setting character width and height. */
3132         xw.cw = ceilf(dc.font.width * cwscale);
3133         xw.ch = ceilf(dc.font.height * chscale);
3134
3135         FcPatternDel(pattern, FC_SLANT);
3136         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3137         if(xloadfont(&dc.ifont, pattern))
3138                 die("st: can't open font %s\n", fontstr);
3139
3140         FcPatternDel(pattern, FC_WEIGHT);
3141         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3142         if(xloadfont(&dc.ibfont, pattern))
3143                 die("st: can't open font %s\n", fontstr);
3144
3145         FcPatternDel(pattern, FC_SLANT);
3146         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3147         if(xloadfont(&dc.bfont, pattern))
3148                 die("st: can't open font %s\n", fontstr);
3149
3150         FcPatternDestroy(pattern);
3151 }
3152
3153 void
3154 xunloadfont(Font *f) {
3155         XftFontClose(xw.dpy, f->match);
3156         FcPatternDestroy(f->pattern);
3157         if(f->set)
3158                 FcFontSetDestroy(f->set);
3159 }
3160
3161 void
3162 xunloadfonts(void) {
3163         /* Free the loaded fonts in the font cache.  */
3164         while(frclen > 0)
3165                 XftFontClose(xw.dpy, frc[--frclen].font);
3166
3167         xunloadfont(&dc.font);
3168         xunloadfont(&dc.bfont);
3169         xunloadfont(&dc.ifont);
3170         xunloadfont(&dc.ibfont);
3171 }
3172
3173 void
3174 xzoom(const Arg *arg) {
3175         Arg larg;
3176
3177         larg.i = usedfontsize + arg->i;
3178         xzoomabs(&larg);
3179 }
3180
3181 void
3182 xzoomabs(const Arg *arg) {
3183         xunloadfonts();
3184         xloadfonts(usedfont, arg->i);
3185         cresize(0, 0);
3186         redraw();
3187         xhints();
3188 }
3189
3190 void
3191 xzoomreset(const Arg *arg) {
3192         Arg larg;
3193
3194         if(defaultfontsize > 0) {
3195                 larg.i = defaultfontsize;
3196                 xzoomabs(&larg);
3197         }
3198 }
3199
3200 void
3201 xinit(void) {
3202         XGCValues gcvalues;
3203         Cursor cursor;
3204         Window parent;
3205         pid_t thispid = getpid();
3206
3207         if(!(xw.dpy = XOpenDisplay(NULL)))
3208                 die("Can't open display\n");
3209         xw.scr = XDefaultScreen(xw.dpy);
3210         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3211
3212         /* font */
3213         if(!FcInit())
3214                 die("Could not init fontconfig.\n");
3215
3216         usedfont = (opt_font == NULL)? font : opt_font;
3217         xloadfonts(usedfont, 0);
3218
3219         /* colors */
3220         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3221         xloadcols();
3222
3223         /* adjust fixed window geometry */
3224         xw.w = 2 * borderpx + term.col * xw.cw;
3225         xw.h = 2 * borderpx + term.row * xw.ch;
3226         if(xw.gm & XNegative)
3227                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3228         if(xw.gm & YNegative)
3229                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3230
3231         /* Events */
3232         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3233         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3234         xw.attrs.bit_gravity = NorthWestGravity;
3235         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3236                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3237                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3238         xw.attrs.colormap = xw.cmap;
3239
3240         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3241                 parent = XRootWindow(xw.dpy, xw.scr);
3242         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3243                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3244                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3245                         | CWEventMask | CWColormap, &xw.attrs);
3246
3247         memset(&gcvalues, 0, sizeof(gcvalues));
3248         gcvalues.graphics_exposures = False;
3249         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3250                         &gcvalues);
3251         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3252                         DefaultDepth(xw.dpy, xw.scr));
3253         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3254         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3255
3256         /* Xft rendering context */
3257         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3258
3259         /* input methods */
3260         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3261                 XSetLocaleModifiers("@im=local");
3262                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3263                         XSetLocaleModifiers("@im=");
3264                         if((xw.xim = XOpenIM(xw.dpy,
3265                                         NULL, NULL, NULL)) == NULL) {
3266                                 die("XOpenIM failed. Could not open input"
3267                                         " device.\n");
3268                         }
3269                 }
3270         }
3271         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3272                                            | XIMStatusNothing, XNClientWindow, xw.win,
3273                                            XNFocusWindow, xw.win, NULL);
3274         if(xw.xic == NULL)
3275                 die("XCreateIC failed. Could not obtain input method.\n");
3276
3277         /* white cursor, black outline */
3278         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3279         XDefineCursor(xw.dpy, xw.win, cursor);
3280         XRecolorCursor(xw.dpy, cursor,
3281                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3282                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3283
3284         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3285         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3286         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3287         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3288
3289         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3290         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3291                         PropModeReplace, (uchar *)&thispid, 1);
3292
3293         xresettitle();
3294         XMapWindow(xw.dpy, xw.win);
3295         xhints();
3296         XSync(xw.dpy, False);
3297 }
3298
3299 void
3300 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3301         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3302             width = charlen * xw.cw, xp, i;
3303         int frcflags, charexists;
3304         int u8fl, u8fblen, u8cblen, doesexist;
3305         char *u8c, *u8fs;
3306         long unicodep;
3307         Font *font = &dc.font;
3308         FcResult fcres;
3309         FcPattern *fcpattern, *fontpattern;
3310         FcFontSet *fcsets[] = { NULL };
3311         FcCharSet *fccharset;
3312         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3313         XRenderColor colfg, colbg;
3314         XRectangle r;
3315         int oneatatime;
3316
3317         frcflags = FRC_NORMAL;
3318
3319         if(base.mode & ATTR_ITALIC) {
3320                 if(base.fg == defaultfg)
3321                         base.fg = defaultitalic;
3322                 font = &dc.ifont;
3323                 frcflags = FRC_ITALIC;
3324         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3325                 if(base.fg == defaultfg)
3326                         base.fg = defaultitalic;
3327                 font = &dc.ibfont;
3328                 frcflags = FRC_ITALICBOLD;
3329         } else if(base.mode & ATTR_UNDERLINE) {
3330                 if(base.fg == defaultfg)
3331                         base.fg = defaultunderline;
3332         }
3333
3334         if(IS_TRUECOL(base.fg)) {
3335                 colfg.alpha = 0xffff;
3336                 colfg.red = TRUERED(base.fg);
3337                 colfg.green = TRUEGREEN(base.fg);
3338                 colfg.blue = TRUEBLUE(base.fg);
3339                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3340                 fg = &truefg;
3341         } else {
3342                 fg = &dc.col[base.fg];
3343         }
3344
3345         if(IS_TRUECOL(base.bg)) {
3346                 colbg.alpha = 0xffff;
3347                 colbg.green = TRUEGREEN(base.bg);
3348                 colbg.red = TRUERED(base.bg);
3349                 colbg.blue = TRUEBLUE(base.bg);
3350                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3351                 bg = &truebg;
3352         } else {
3353                 bg = &dc.col[base.bg];
3354         }
3355
3356         if(base.mode & ATTR_BOLD) {
3357                 /*
3358                  * change basic system colors [0-7]
3359                  * to bright system colors [8-15]
3360                  */
3361                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3362                         fg = &dc.col[base.fg + 8];
3363
3364                 if(base.mode & ATTR_ITALIC) {
3365                         font = &dc.ibfont;
3366                         frcflags = FRC_ITALICBOLD;
3367                 } else {
3368                         font = &dc.bfont;
3369                         frcflags = FRC_BOLD;
3370                 }
3371         }
3372
3373         if(IS_SET(MODE_REVERSE)) {
3374                 if(fg == &dc.col[defaultfg]) {
3375                         fg = &dc.col[defaultbg];
3376                 } else {
3377                         colfg.red = ~fg->color.red;
3378                         colfg.green = ~fg->color.green;
3379                         colfg.blue = ~fg->color.blue;
3380                         colfg.alpha = fg->color.alpha;
3381                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3382                                         &revfg);
3383                         fg = &revfg;
3384                 }
3385
3386                 if(bg == &dc.col[defaultbg]) {
3387                         bg = &dc.col[defaultfg];
3388                 } else {
3389                         colbg.red = ~bg->color.red;
3390                         colbg.green = ~bg->color.green;
3391                         colbg.blue = ~bg->color.blue;
3392                         colbg.alpha = bg->color.alpha;
3393                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3394                                         &revbg);
3395                         bg = &revbg;
3396                 }
3397         }
3398
3399         if(base.mode & ATTR_REVERSE) {
3400                 temp = fg;
3401                 fg = bg;
3402                 bg = temp;
3403         }
3404
3405         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3406                 colfg.red = fg->color.red / 2;
3407                 colfg.green = fg->color.green / 2;
3408                 colfg.blue = fg->color.blue / 2;
3409                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3410                 fg = &revfg;
3411         }
3412
3413         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3414                 fg = bg;
3415
3416         if(base.mode & ATTR_INVISIBLE)
3417                 fg = bg;
3418
3419         /* Intelligent cleaning up of the borders. */
3420         if(x == 0) {
3421                 xclear(0, (y == 0)? 0 : winy, borderpx,
3422                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3423         }
3424         if(x + charlen >= term.col) {
3425                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3426                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3427         }
3428         if(y == 0)
3429                 xclear(winx, 0, winx + width, borderpx);
3430         if(y == term.row-1)
3431                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3432
3433         /* Clean up the region we want to draw to. */
3434         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3435
3436         /* Set the clip region because Xft is sometimes dirty. */
3437         r.x = 0;
3438         r.y = 0;
3439         r.height = xw.ch;
3440         r.width = width;
3441         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3442
3443         for(xp = winx; bytelen > 0;) {
3444                 /*
3445                  * Search for the range in the to be printed string of glyphs
3446                  * that are in the main font. Then print that range. If
3447                  * some glyph is found that is not in the font, do the
3448                  * fallback dance.
3449                  */
3450                 u8fs = s;
3451                 u8fblen = 0;
3452                 u8fl = 0;
3453                 oneatatime = font->width != xw.cw;
3454                 for(;;) {
3455                         u8c = s;
3456                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3457                         s += u8cblen;
3458                         bytelen -= u8cblen;
3459
3460                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3461                         if(doesexist) {
3462                                         u8fl++;
3463                                         u8fblen += u8cblen;
3464                                         if(!oneatatime && bytelen > 0)
3465                                                         continue;
3466                         }
3467
3468                         if(u8fl > 0) {
3469                                 XftDrawStringUtf8(xw.draw, fg,
3470                                                 font->match, xp,
3471                                                 winy + font->ascent,
3472                                                 (FcChar8 *)u8fs,
3473                                                 u8fblen);
3474                                 xp += xw.cw * u8fl;
3475                         }
3476                         break;
3477                 }
3478                 if(doesexist) {
3479                         if(oneatatime)
3480                                 continue;
3481                         break;
3482                 }
3483
3484                 /* Search the font cache. */
3485                 for(i = 0; i < frclen; i++) {
3486                         charexists = XftCharExists(xw.dpy, frc[i].font, unicodep);
3487                         /* Everything correct. */
3488                         if(charexists && frc[i].flags == frcflags)
3489                                 break;
3490                         /* We got a default font for a not found glyph. */
3491                         if(!charexists && frc[i].flags == frcflags \
3492                                         && frc[i].unicodep == unicodep) {
3493                                 break;
3494                         }
3495                 }
3496
3497                 /* Nothing was found. */
3498                 if(i >= frclen) {
3499                         if(!font->set)
3500                                 font->set = FcFontSort(0, font->pattern,
3501                                                        FcTrue, 0, &fcres);
3502                         fcsets[0] = font->set;
3503
3504                         /*
3505                          * Nothing was found in the cache. Now use
3506                          * some dozen of Fontconfig calls to get the
3507                          * font for one single character.
3508                          *
3509                          * Xft and fontconfig are design failures.
3510                          */
3511                         fcpattern = FcPatternDuplicate(font->pattern);
3512                         fccharset = FcCharSetCreate();
3513
3514                         FcCharSetAddChar(fccharset, unicodep);
3515                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3516                                         fccharset);
3517                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3518                                         FcTrue);
3519
3520                         FcConfigSubstitute(0, fcpattern,
3521                                         FcMatchPattern);
3522                         FcDefaultSubstitute(fcpattern);
3523
3524                         fontpattern = FcFontSetMatch(0, fcsets, 1,
3525                                         fcpattern, &fcres);
3526
3527                         /*
3528                          * Overwrite or create the new cache entry.
3529                          */
3530                         if(frclen >= LEN(frc)) {
3531                                 frclen = LEN(frc) - 1;
3532                                 XftFontClose(xw.dpy, frc[frclen].font);
3533                                 frc[frclen].unicodep = 0;
3534                         }
3535
3536                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3537                                         fontpattern);
3538                         frc[frclen].flags = frcflags;
3539                         frc[frclen].unicodep = unicodep;
3540
3541                         i = frclen;
3542                         frclen++;
3543
3544                         FcPatternDestroy(fcpattern);
3545                         FcCharSetDestroy(fccharset);
3546                 }
3547
3548                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3549                                 xp, winy + frc[i].font->ascent,
3550                                 (FcChar8 *)u8c, u8cblen);
3551
3552                 xp += xw.cw * wcwidth(unicodep);
3553         }
3554
3555         /*
3556          * This is how the loop above actually should be. Why does the
3557          * application have to care about font details?
3558          *
3559          * I have to repeat: Xft and Fontconfig are design failures.
3560          */
3561         /*
3562         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3563                         winy + font->ascent, (FcChar8 *)s, bytelen);
3564         */
3565
3566         if(base.mode & ATTR_UNDERLINE) {
3567                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3568                                 width, 1);
3569         }
3570
3571         if(base.mode & ATTR_STRUCK) {
3572                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3573                                 width, 1);
3574         }
3575
3576         /* Reset clip to none. */
3577         XftDrawSetClip(xw.draw, 0);
3578 }
3579
3580 void
3581 xdrawcursor(void) {
3582         static int oldx = 0, oldy = 0;
3583         int sl, width, curx;
3584         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3585
3586         LIMIT(oldx, 0, term.col-1);
3587         LIMIT(oldy, 0, term.row-1);
3588
3589         curx = term.c.x;
3590
3591         /* adjust position if in dummy */
3592         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3593                 oldx--;
3594         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3595                 curx--;
3596
3597         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3598
3599         /* remove the old cursor */
3600         sl = utf8len(term.line[oldy][oldx].c);
3601         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3602         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3603                         oldy, width, sl);
3604
3605         if(IS_SET(MODE_HIDE))
3606                 return;
3607
3608         /* draw the new one */
3609         if(xw.state & WIN_FOCUSED) {
3610                 switch (xw.cursor) {
3611                         case 0: /* Blinking Block */
3612                         case 1: /* Blinking Block (Default) */
3613                         case 2: /* Steady Block */
3614                                 if(IS_SET(MODE_REVERSE)) {
3615                                                 g.mode |= ATTR_REVERSE;
3616                                                 g.fg = defaultcs;
3617                                                 g.bg = defaultfg;
3618                                         }
3619
3620                                 sl = utf8len(g.c);
3621                                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3622                                         ? 2 : 1;
3623                                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3624                                 break;
3625                         case 3: /* Blinking Underline */
3626                         case 4: /* Steady Underline */
3627                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3628                                                 borderpx + curx * xw.cw,
3629                                                 borderpx + (term.c.y + 1) * xw.ch - cursorthickness,
3630                                                 xw.cw, cursorthickness);
3631                                 break;
3632                         case 5: /* Blinking bar */
3633                         case 6: /* Steady bar */
3634                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3635                                                 borderpx + curx * xw.cw,
3636                                                 borderpx + term.c.y * xw.ch,
3637                                                 cursorthickness, xw.ch);
3638                                 break;
3639                 }
3640         } else {
3641                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3642                                 borderpx + curx * xw.cw,
3643                                 borderpx + term.c.y * xw.ch,
3644                                 xw.cw - 1, 1);
3645                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3646                                 borderpx + curx * xw.cw,
3647                                 borderpx + term.c.y * xw.ch,
3648                                 1, xw.ch - 1);
3649                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3650                                 borderpx + (curx + 1) * xw.cw - 1,
3651                                 borderpx + term.c.y * xw.ch,
3652                                 1, xw.ch - 1);
3653                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3654                                 borderpx + curx * xw.cw,
3655                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3656                                 xw.cw, 1);
3657         }
3658         oldx = curx, oldy = term.c.y;
3659 }
3660
3661
3662 void
3663 xsettitle(char *p) {
3664         XTextProperty prop;
3665
3666         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3667                         &prop);
3668         XSetWMName(xw.dpy, xw.win, &prop);
3669         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3670         XFree(prop.value);
3671 }
3672
3673 void
3674 xresettitle(void) {
3675         xsettitle(opt_title ? opt_title : "st");
3676 }
3677
3678 void
3679 redraw(void) {
3680         tfulldirt();
3681         draw();
3682 }
3683
3684 void
3685 draw(void) {
3686         drawregion(0, 0, term.col, term.row);
3687         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3688                         xw.h, 0, 0);
3689         XSetForeground(xw.dpy, dc.gc,
3690                         dc.col[IS_SET(MODE_REVERSE)?
3691                                 defaultfg : defaultbg].pixel);
3692 }
3693
3694 void
3695 drawregion(int x1, int y1, int x2, int y2) {
3696         int ic, ib, x, y, ox, sl;
3697         Glyph base, new;
3698         char buf[DRAW_BUF_SIZ];
3699         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3700         long unicodep;
3701
3702         if(!(xw.state & WIN_VISIBLE))
3703                 return;
3704
3705         for(y = y1; y < y2; y++) {
3706                 if(!term.dirty[y])
3707                         continue;
3708
3709                 xtermclear(0, y, term.col, y);
3710                 term.dirty[y] = 0;
3711                 base = term.line[y][0];
3712                 ic = ib = ox = 0;
3713                 for(x = x1; x < x2; x++) {
3714                         new = term.line[y][x];
3715                         if(new.mode == ATTR_WDUMMY)
3716                                 continue;
3717                         if(ena_sel && selected(x, y))
3718                                 new.mode ^= ATTR_REVERSE;
3719                         if(ib > 0 && (ATTRCMP(base, new)
3720                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3721                                 xdraws(buf, base, ox, y, ic, ib);
3722                                 ic = ib = 0;
3723                         }
3724                         if(ib == 0) {
3725                                 ox = x;
3726                                 base = new;
3727                         }
3728
3729                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3730                         memcpy(buf+ib, new.c, sl);
3731                         ib += sl;
3732                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3733                 }
3734                 if(ib > 0)
3735                         xdraws(buf, base, ox, y, ic, ib);
3736         }
3737         xdrawcursor();
3738 }
3739
3740 void
3741 expose(XEvent *ev) {
3742         XExposeEvent *e = &ev->xexpose;
3743
3744         if(xw.state & WIN_REDRAW) {
3745                 if(!e->count)
3746                         xw.state &= ~WIN_REDRAW;
3747         }
3748         redraw();
3749 }
3750
3751 void
3752 visibility(XEvent *ev) {
3753         XVisibilityEvent *e = &ev->xvisibility;
3754
3755         if(e->state == VisibilityFullyObscured) {
3756                 xw.state &= ~WIN_VISIBLE;
3757         } else if(!(xw.state & WIN_VISIBLE)) {
3758                 /* need a full redraw for next Expose, not just a buf copy */
3759                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3760         }
3761 }
3762
3763 void
3764 unmap(XEvent *ev) {
3765         xw.state &= ~WIN_VISIBLE;
3766 }
3767
3768 void
3769 xsetpointermotion(int set) {
3770         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3771         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3772 }
3773
3774 void
3775 xseturgency(int add) {
3776         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3777
3778         MODBIT(h->flags, add, XUrgencyHint);
3779         XSetWMHints(xw.dpy, xw.win, h);
3780         XFree(h);
3781 }
3782
3783 void
3784 focus(XEvent *ev) {
3785         XFocusChangeEvent *e = &ev->xfocus;
3786
3787         if(e->mode == NotifyGrab)
3788                 return;
3789
3790         if(ev->type == FocusIn) {
3791                 XSetICFocus(xw.xic);
3792                 xw.state |= WIN_FOCUSED;
3793                 xseturgency(0);
3794                 if(IS_SET(MODE_FOCUS))
3795                         ttywrite("\033[I", 3);
3796         } else {
3797                 XUnsetICFocus(xw.xic);
3798                 xw.state &= ~WIN_FOCUSED;
3799                 if(IS_SET(MODE_FOCUS))
3800                         ttywrite("\033[O", 3);
3801         }
3802 }
3803
3804 bool
3805 match(uint mask, uint state) {
3806         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3807 }
3808
3809 void
3810 numlock(const Arg *dummy) {
3811         term.numlock ^= 1;
3812 }
3813
3814 char*
3815 kmap(KeySym k, uint state) {
3816         Key *kp;
3817         int i;
3818
3819         /* Check for mapped keys out of X11 function keys. */
3820         for(i = 0; i < LEN(mappedkeys); i++) {
3821                 if(mappedkeys[i] == k)
3822                         break;
3823         }
3824         if(i == LEN(mappedkeys)) {
3825                 if((k & 0xFFFF) < 0xFD00)
3826                         return NULL;
3827         }
3828
3829         for(kp = key; kp < key + LEN(key); kp++) {
3830                 if(kp->k != k)
3831                         continue;
3832
3833                 if(!match(kp->mask, state))
3834                         continue;
3835
3836                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3837                         continue;
3838                 if(term.numlock && kp->appkey == 2)
3839                         continue;
3840
3841                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3842                         continue;
3843
3844                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3845                         continue;
3846
3847                 return kp->s;
3848         }
3849
3850         return NULL;
3851 }
3852
3853 void
3854 kpress(XEvent *ev) {
3855         XKeyEvent *e = &ev->xkey;
3856         KeySym ksym;
3857         char buf[32], *customkey;
3858         int len;
3859         long c;
3860         Status status;
3861         Shortcut *bp;
3862
3863         if(IS_SET(MODE_KBDLOCK))
3864                 return;
3865
3866         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3867         /* 1. shortcuts */
3868         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3869                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3870                         bp->func(&(bp->arg));
3871                         return;
3872                 }
3873         }
3874
3875         /* 2. custom keys from config.h */
3876         if((customkey = kmap(ksym, e->state))) {
3877                 ttysend(customkey, strlen(customkey));
3878                 return;
3879         }
3880
3881         /* 3. composed string from input method */
3882         if(len == 0)
3883                 return;
3884         if(len == 1 && e->state & Mod1Mask) {
3885                 if(IS_SET(MODE_8BIT)) {
3886                         if(*buf < 0177) {
3887                                 c = *buf | 0x80;
3888                                 len = utf8encode(c, buf, UTF_SIZ);
3889                         }
3890                 } else {
3891                         buf[1] = buf[0];
3892                         buf[0] = '\033';
3893                         len = 2;
3894                 }
3895         }
3896         ttysend(buf, len);
3897 }
3898
3899
3900 void
3901 cmessage(XEvent *e) {
3902         /*
3903          * See xembed specs
3904          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3905          */
3906         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3907                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3908                         xw.state |= WIN_FOCUSED;
3909                         xseturgency(0);
3910                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3911                         xw.state &= ~WIN_FOCUSED;
3912                 }
3913         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3914                 /* Send SIGHUP to shell */
3915                 kill(pid, SIGHUP);
3916                 exit(EXIT_SUCCESS);
3917         }
3918 }
3919
3920 void
3921 cresize(int width, int height) {
3922         int col, row;
3923
3924         if(width != 0)
3925                 xw.w = width;
3926         if(height != 0)
3927                 xw.h = height;
3928
3929         col = (xw.w - 2 * borderpx) / xw.cw;
3930         row = (xw.h - 2 * borderpx) / xw.ch;
3931
3932         tresize(col, row);
3933         xresize(col, row);
3934         ttyresize();
3935 }
3936
3937 void
3938 resize(XEvent *e) {
3939         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3940                 return;
3941
3942         cresize(e->xconfigure.width, e->xconfigure.height);
3943 }
3944
3945 void
3946 run(void) {
3947         XEvent ev;
3948         int w = xw.w, h = xw.h;
3949         fd_set rfd;
3950         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3951         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3952         long deltatime;
3953
3954         /* Waiting for window mapping */
3955         do {
3956                 XNextEvent(xw.dpy, &ev);
3957                 if(ev.type == ConfigureNotify) {
3958                         w = ev.xconfigure.width;
3959                         h = ev.xconfigure.height;
3960                 }
3961         } while(ev.type != MapNotify);
3962
3963         ttynew();
3964         cresize(w, h);
3965
3966         clock_gettime(CLOCK_MONOTONIC, &last);
3967         lastblink = last;
3968
3969         for(xev = actionfps;;) {
3970                 FD_ZERO(&rfd);
3971                 FD_SET(cmdfd, &rfd);
3972                 FD_SET(xfd, &rfd);
3973
3974                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3975                         if(errno == EINTR)
3976                                 continue;
3977                         die("select failed: %s\n", strerror(errno));
3978                 }
3979                 if(FD_ISSET(cmdfd, &rfd)) {
3980                         ttyread();
3981                         if(blinktimeout) {
3982                                 blinkset = tattrset(ATTR_BLINK);
3983                                 if(!blinkset)
3984                                         MODBIT(term.mode, 0, MODE_BLINK);
3985                         }
3986                 }
3987
3988                 if(FD_ISSET(xfd, &rfd))
3989                         xev = actionfps;
3990
3991                 clock_gettime(CLOCK_MONOTONIC, &now);
3992                 drawtimeout.tv_sec = 0;
3993                 drawtimeout.tv_nsec =  (1000 * 1E6)/ xfps;
3994                 tv = &drawtimeout;
3995
3996                 dodraw = 0;
3997                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3998                         tsetdirtattr(ATTR_BLINK);
3999                         term.mode ^= MODE_BLINK;
4000                         lastblink = now;
4001                         dodraw = 1;
4002                 }
4003                 deltatime = TIMEDIFF(now, last);
4004                 if(deltatime > 1000 / (xev ? xfps : actionfps)) {
4005                         dodraw = 1;
4006                         last = now;
4007                 }
4008
4009                 if(dodraw) {
4010                         while(XPending(xw.dpy)) {
4011                                 XNextEvent(xw.dpy, &ev);
4012                                 if(XFilterEvent(&ev, None))
4013                                         continue;
4014                                 if(handler[ev.type])
4015                                         (handler[ev.type])(&ev);
4016                         }
4017
4018                         draw();
4019                         XFlush(xw.dpy);
4020
4021                         if(xev && !FD_ISSET(xfd, &rfd))
4022                                 xev--;
4023                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
4024                                 if(blinkset) {
4025                                         if(TIMEDIFF(now, lastblink) \
4026                                                         > blinktimeout) {
4027                                                 drawtimeout.tv_nsec = 1000;
4028                                         } else {
4029                                                 drawtimeout.tv_nsec = (1E6 * \
4030                                                         (blinktimeout - \
4031                                                         TIMEDIFF(now,
4032                                                                 lastblink)));
4033                                         }
4034                                         drawtimeout.tv_sec = \
4035                                             drawtimeout.tv_nsec / 1E9;
4036                                         drawtimeout.tv_nsec %= (long)1E9;
4037                                 } else {
4038                                         tv = NULL;
4039                                 }
4040                         }
4041                 }
4042         }
4043 }
4044
4045 void
4046 usage(void) {
4047         die("%s " VERSION " (c) 2010-2015 st engineers\n"
4048         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4049         "          [-i] [-t title] [-w windowid] [-e command ...] [command ...]\n"
4050         "       st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4051         "          [-i] [-t title] [-w windowid] [-l line] [stty_args ...]\n",
4052         argv0);
4053 }
4054
4055 int
4056 main(int argc, char *argv[]) {
4057         uint cols = 80, rows = 24;
4058
4059         xw.l = xw.t = 0;
4060         xw.isfixed = False;
4061         xw.cursor = 0;
4062
4063         ARGBEGIN {
4064         case 'a':
4065                 allowaltscreen = false;
4066                 break;
4067         case 'c':
4068                 opt_class = EARGF(usage());
4069                 break;
4070         case 'e':
4071                 if(argc > 1)
4072                         --argc, ++argv;
4073                 goto run;
4074         case 'f':
4075                 opt_font = EARGF(usage());
4076                 break;
4077         case 'g':
4078                 xw.gm = XParseGeometry(EARGF(usage()),
4079                                 &xw.l, &xw.t, &cols, &rows);
4080                 break;
4081         case 'i':
4082                 xw.isfixed = True;
4083                 break;
4084         case 'o':
4085                 opt_io = EARGF(usage());
4086                 break;
4087         case 'l':
4088                 opt_line = EARGF(usage());
4089                 break;
4090         case 't':
4091                 opt_title = EARGF(usage());
4092                 break;
4093         case 'w':
4094                 opt_embed = EARGF(usage());
4095                 break;
4096         case 'v':
4097         default:
4098                 usage();
4099         } ARGEND;
4100
4101 run:
4102         if(argc > 0) {
4103                 /* eat all remaining arguments */
4104                 opt_cmd = argv;
4105                 if(!opt_title)
4106                         opt_title = basename(xstrdup(argv[0]));
4107         }
4108         setlocale(LC_CTYPE, "");
4109         XSetLocaleModifiers("");
4110         tnew(MAX(cols, 1), MAX(rows, 1));
4111         xinit();
4112         selinit();
4113         run();
4114
4115         return 0;
4116 }
4117