st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  74 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  75 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  76 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  77 #define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
  78 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  79
  80 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  81 #define IS_TRUECOL(x)    (1 << 24 & (x))
  82 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  83 #define TRUEGREEN(x)     (((x) & 0xff00))
  84 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  85
  86
  87 #define VT102ID "\033[?6c"
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_REVERSE   = 1,
  92         ATTR_UNDERLINE = 2,
  93         ATTR_BOLD      = 4,
  94         ATTR_GFX       = 8,
  95         ATTR_ITALIC    = 16,
  96         ATTR_BLINK     = 32,
  97         ATTR_WRAP      = 64,
  98         ATTR_WIDE      = 128,
  99         ATTR_WDUMMY    = 256,
 100 };
 101
 102 enum cursor_movement {
 103         CURSOR_SAVE,
 104         CURSOR_LOAD
 105 };
 106
 107 enum cursor_state {
 108         CURSOR_DEFAULT  = 0,
 109         CURSOR_WRAPNEXT = 1,
 110         CURSOR_ORIGIN   = 2
 111 };
 112
 113 enum term_mode {
 114         MODE_WRAP        = 1,
 115         MODE_INSERT      = 2,
 116         MODE_APPKEYPAD   = 4,
 117         MODE_ALTSCREEN   = 8,
 118         MODE_CRLF        = 16,
 119         MODE_MOUSEBTN    = 32,
 120         MODE_MOUSEMOTION = 64,
 121         MODE_REVERSE     = 128,
 122         MODE_KBDLOCK     = 256,
 123         MODE_HIDE        = 512,
 124         MODE_ECHO        = 1024,
 125         MODE_APPCURSOR   = 2048,
 126         MODE_MOUSESGR    = 4096,
 127         MODE_8BIT        = 8192,
 128         MODE_BLINK       = 16384,
 129         MODE_FBLINK      = 32768,
 130         MODE_FOCUS       = 65536,
 131         MODE_MOUSEX10    = 131072,
 132         MODE_MOUSEMANY   = 262144,
 133         MODE_BRCKTPASTE  = 524288,
 134         MODE_PRINT       = 1048576,
 135         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 136                           |MODE_MOUSEMANY,
 137 };
 138
 139 enum charset {
 140         CS_GRAPHIC0,
 141         CS_GRAPHIC1,
 142         CS_UK,
 143         CS_USA,
 144         CS_MULTI,
 145         CS_GER,
 146         CS_FIN
 147 };
 148
 149 enum escape_state {
 150         ESC_START      = 1,
 151         ESC_CSI        = 2,
 152         ESC_STR        = 4,  /* DSC, OSC, PM, APC */
 153         ESC_ALTCHARSET = 8,
 154         ESC_STR_END    = 16, /* a final string was encountered */
 155         ESC_TEST       = 32, /* Enter in test mode */
 156 };
 157
 158 enum window_state {
 159         WIN_VISIBLE = 1,
 160         WIN_REDRAW  = 2,
 161         WIN_FOCUSED = 4
 162 };
 163
 164 enum selection_type {
 165         SEL_REGULAR = 1,
 166         SEL_RECTANGULAR = 2
 167 };
 168
 169 enum selection_snap {
 170         SNAP_WORD = 1,
 171         SNAP_LINE = 2
 172 };
 173
 174 typedef unsigned char uchar;
 175 typedef unsigned int uint;
 176 typedef unsigned long ulong;
 177 typedef unsigned short ushort;
 178
 179 typedef XftDraw *Draw;
 180 typedef XftColor Colour;
 181 typedef Colormap Colourmap;
 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>] */
 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;
 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         Colourmap 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 fx, fy, fw, fh; /* fixed geometry */
 254         int tw, th; /* tty width and height */
 255         int w, h; /* window width and height */
 256         int ch; /* char height */
 257         int cw; /* char width  */
 258         char state; /* focus, redraw, visible */
 259 } XWindow;
 260
 261 typedef struct {
 262         uint b;
 263         uint mask;
 264         char *s;
 265 } Mousekey;
 266
 267 typedef struct {
 268         KeySym k;
 269         uint mask;
 270         char *s;
 271         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 272         signed char appkey;    /* application keypad */
 273         signed char appcursor; /* application cursor */
 274         signed char crlf;      /* crlf mode          */
 275 } Key;
 276
 277 typedef struct {
 278         int mode;
 279         int type;
 280         int snap;
 281         /*
 282          * Selection variables:
 283          * nb – normalized coordinates of the beginning of the selection
 284          * ne – normalized coordinates of the end of the selection
 285          * ob – original coordinates of the beginning of the selection
 286          * oe – original coordinates of the end of the selection
 287          */
 288         struct {
 289                 int x, y;
 290         } nb, ne, ob, oe;
 291
 292         char *clip;
 293         Atom xtarget;
 294         bool alt;
 295         struct timeval tclick1;
 296         struct timeval tclick2;
 297 } Selection;
 298
 299 typedef union {
 300         int i;
 301         uint ui;
 302         float f;
 303         const void *v;
 304 } Arg;
 305
 306 typedef struct {
 307         uint mod;
 308         KeySym keysym;
 309         void (*func)(const Arg *);
 310         const Arg arg;
 311 } Shortcut;
 312
 313 /* function definitions used in config.h */
 314 static void clippaste(const Arg *);
 315 static void numlock(const Arg *);
 316 static void selpaste(const Arg *);
 317 static void xzoom(const Arg *);
 318 static void printsel(const Arg *);
 319 static void printscreen(const Arg *) ;
 320 static void toggleprinter(const Arg *);
 321
 322 /* Config.h for applying patches and the configuration. */
 323 #include "config.h"
 324
 325 /* Font structure */
 326 typedef struct {
 327         int height;
 328         int width;
 329         int ascent;
 330         int descent;
 331         short lbearing;
 332         short rbearing;
 333         XftFont *match;
 334         FcFontSet *set;
 335         FcPattern *pattern;
 336 } Font;
 337
 338 /* Drawing Context */
 339 typedef struct {
 340         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 341         Font font, bfont, ifont, ibfont;
 342         GC gc;
 343 } DC;
 344
 345 static void die(const char *, ...);
 346 static void draw(void);
 347 static void redraw(int);
 348 static void drawregion(int, int, int, int);
 349 static void execsh(void);
 350 static void sigchld(int);
 351 static void run(void);
 352
 353 static void csidump(void);
 354 static void csihandle(void);
 355 static void csiparse(void);
 356 static void csireset(void);
 357 static void strdump(void);
 358 static void strhandle(void);
 359 static void strparse(void);
 360 static void strreset(void);
 361
 362 static int tattrset(int);
 363 static void tprinter(char *, size_t);
 364 static void tdumpsel(void);
 365 static void tdumpline(int);
 366 static void tdump(void);
 367 static void tclearregion(int, int, int, int);
 368 static void tcursor(int);
 369 static void tdeletechar(int);
 370 static void tdeleteline(int);
 371 static void tinsertblank(int);
 372 static void tinsertblankline(int);
 373 static void tmoveto(int, int);
 374 static void tmoveato(int, int);
 375 static void tnew(int, int);
 376 static void tnewline(int);
 377 static void tputtab(bool);
 378 static void tputc(char *, int);
 379 static void treset(void);
 380 static int tresize(int, int);
 381 static void tscrollup(int, int);
 382 static void tscrolldown(int, int);
 383 static void tsetattr(int *, int);
 384 static void tsetchar(char *, Glyph *, int, int);
 385 static void tsetscroll(int, int);
 386 static void tswapscreen(void);
 387 static void tsetdirt(int, int);
 388 static void tsetdirtattr(int);
 389 static void tsetmode(bool, bool, int *, int);
 390 static void tfulldirt(void);
 391 static void techo(char *, int);
 392 static int32_t tdefcolor(int *, int *, int);
 393 static void tselcs(void);
 394 static void tdeftran(char);
 395 static inline bool match(uint, uint);
 396 static void ttynew(void);
 397 static void ttyread(void);
 398 static void ttyresize(void);
 399 static void ttysend(char *, size_t);
 400 static void ttywrite(const char *, size_t);
 401
 402 static void xdraws(char *, Glyph, int, int, int, int);
 403 static void xhints(void);
 404 static void xclear(int, int, int, int);
 405 static void xdrawcursor(void);
 406 static void xinit(void);
 407 static void xloadcols(void);
 408 static int xsetcolorname(int, const char *);
 409 static int xloadfont(Font *, FcPattern *);
 410 static void xloadfonts(char *, double);
 411 static int xloadfontset(Font *);
 412 static void xsettitle(char *);
 413 static void xresettitle(void);
 414 static void xsetpointermotion(int);
 415 static void xseturgency(int);
 416 static void xsetsel(char *);
 417 static void xtermclear(int, int, int, int);
 418 static void xunloadfont(Font *);
 419 static void xunloadfonts(void);
 420 static void xresize(int, int);
 421
 422 static void expose(XEvent *);
 423 static void visibility(XEvent *);
 424 static void unmap(XEvent *);
 425 static char *kmap(KeySym, uint);
 426 static void kpress(XEvent *);
 427 static void cmessage(XEvent *);
 428 static void cresize(int, int);
 429 static void resize(XEvent *);
 430 static void focus(XEvent *);
 431 static void brelease(XEvent *);
 432 static void bpress(XEvent *);
 433 static void bmotion(XEvent *);
 434 static void selnotify(XEvent *);
 435 static void selclear(XEvent *);
 436 static void selrequest(XEvent *);
 437
 438 static void selinit(void);
 439 static void selsort(void);
 440 static inline bool selected(int, int);
 441 static char *getsel(void);
 442 static void selcopy(void);
 443 static void selscroll(int, int);
 444 static void selsnap(int, int *, int *, int);
 445
 446 static size_t utf8decode(char *, long *, size_t);
 447 static long utf8decodebyte(char, size_t *);
 448 static size_t utf8encode(long, char *, size_t);
 449 static char utf8encodebyte(long, size_t);
 450 static size_t utf8len(char *);
 451 static size_t utf8validate(long *, size_t);
 452
 453 static ssize_t xwrite(int, char *, size_t);
 454 static void *xmalloc(size_t);
 455 static void *xrealloc(void *, size_t);
 456 static char *xstrdup(char *);
 457
 458 static void (*handler[LASTEvent])(XEvent *) = {
 459         [KeyPress] = kpress,
 460         [ClientMessage] = cmessage,
 461         [ConfigureNotify] = resize,
 462         [VisibilityNotify] = visibility,
 463         [UnmapNotify] = unmap,
 464         [Expose] = expose,
 465         [FocusIn] = focus,
 466         [FocusOut] = focus,
 467         [MotionNotify] = bmotion,
 468         [ButtonPress] = bpress,
 469         [ButtonRelease] = brelease,
 470         [SelectionClear] = selclear,
 471         [SelectionNotify] = selnotify,
 472         [SelectionRequest] = selrequest,
 473 };
 474
 475 /* Globals */
 476 static DC dc;
 477 static XWindow xw;
 478 static Term term;
 479 static CSIEscape csiescseq;
 480 static STREscape strescseq;
 481 static int cmdfd;
 482 static pid_t pid;
 483 static Selection sel;
 484 static int iofd = STDOUT_FILENO;
 485 static char **opt_cmd = NULL;
 486 static char *opt_io = NULL;
 487 static char *opt_title = NULL;
 488 static char *opt_embed = NULL;
 489 static char *opt_class = NULL;
 490 static char *opt_font = NULL;
 491 static int oldbutton = 3; /* button event on startup: 3 = release */
 492
 493 static char *usedfont = NULL;
 494 static double usedfontsize = 0;
 495
 496 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 497 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 498 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 499 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 500
 501 /* Font Ring Cache */
 502 enum {
 503         FRC_NORMAL,
 504         FRC_ITALIC,
 505         FRC_BOLD,
 506         FRC_ITALICBOLD
 507 };
 508
 509 typedef struct {
 510         XftFont *font;
 511         int flags;
 512 } Fontcache;
 513
 514 /* Fontcache is an array now. A new font will be appended to the array. */
 515 static Fontcache frc[16];
 516 static int frclen = 0;
 517
 518 ssize_t
 519 xwrite(int fd, char *s, size_t len) {
 520         size_t aux = len;
 521
 522         while(len > 0) {
 523                 ssize_t r = write(fd, s, len);
 524                 if(r < 0)
 525                         return r;
 526                 len -= r;
 527                 s += r;
 528         }
 529         return aux;
 530 }
 531
 532 void *
 533 xmalloc(size_t len) {
 534         void *p = malloc(len);
 535
 536         if(!p)
 537                 die("Out of memory\n");
 538
 539         return p;
 540 }
 541
 542 void *
 543 xrealloc(void *p, size_t len) {
 544         if((p = realloc(p, len)) == NULL)
 545                 die("Out of memory\n");
 546
 547         return p;
 548 }
 549
 550 char *
 551 xstrdup(char *s) {
 552         if((s = strdup(s)) == NULL)
 553                 die("Out of memory\n");
 554
 555         return s;
 556 }
 557
 558 size_t
 559 utf8decode(char *c, long *u, size_t clen) {
 560         size_t i, j, len, type;
 561         long udecoded;
 562
 563         *u = UTF_INVALID;
 564         if(!clen)
 565                 return 0;
 566         udecoded = utf8decodebyte(c[0], &len);
 567         if(!BETWEEN(len, 1, UTF_SIZ))
 568                 return 1;
 569         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 570                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 571                 if(type != 0)
 572                         return j;
 573         }
 574         if(j < len)
 575                 return 0;
 576         *u = udecoded;
 577         utf8validate(u, len);
 578         return len;
 579 }
 580
 581 long
 582 utf8decodebyte(char c, size_t *i) {
 583         for(*i = 0; *i < LEN(utfmask); ++(*i))
 584                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 585                         return (uchar)c & ~utfmask[*i];
 586         return 0;
 587 }
 588
 589 size_t
 590 utf8encode(long u, char *c, size_t clen) {
 591         size_t len, i;
 592
 593         len = utf8validate(&u, 0);
 594         if(clen < len)
 595                 return 0;
 596         for(i = len - 1; i != 0; --i) {
 597                 c[i] = utf8encodebyte(u, 0);
 598                 u >>= 6;
 599         }
 600         c[0] = utf8encodebyte(u, len);
 601         return len;
 602 }
 603
 604 char
 605 utf8encodebyte(long u, size_t i) {
 606         return utfbyte[i] | (u & ~utfmask[i]);
 607 }
 608
 609 size_t
 610 utf8len(char *c) {
 611         return utf8decode(c, &(long){0}, UTF_SIZ);
 612 }
 613
 614 size_t
 615 utf8validate(long *u, size_t i) {
 616         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 617                 *u = UTF_INVALID;
 618         for(i = 1; *u > utfmax[i]; ++i)
 619                 ;
 620         return i;
 621 }
 622
 623 static void
 624 selinit(void) {
 625         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 626         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 627         sel.mode = 0;
 628         sel.ob.x = -1;
 629         sel.clip = NULL;
 630         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 631         if(sel.xtarget == None)
 632                 sel.xtarget = XA_STRING;
 633 }
 634
 635 static int
 636 x2col(int x) {
 637         x -= borderpx;
 638         x /= xw.cw;
 639
 640         return LIMIT(x, 0, term.col-1);
 641 }
 642
 643 static int
 644 y2row(int y) {
 645         y -= borderpx;
 646         y /= xw.ch;
 647
 648         return LIMIT(y, 0, term.row-1);
 649 }
 650
 651 static void
 652 selsort(void) {
 653         if(sel.ob.y == sel.oe.y) {
 654                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 655                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 656         } else {
 657                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 658                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 659         }
 660         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 661         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 662 }
 663
 664 static inline bool
 665 selected(int x, int y) {
 666         if(sel.ne.y == y && sel.nb.y == y)
 667                 return BETWEEN(x, sel.nb.x, sel.ne.x);
 668
 669         if(sel.type == SEL_RECTANGULAR) {
 670                 return ((sel.nb.y <= y && y <= sel.ne.y)
 671                         && (sel.nb.x <= x && x <= sel.ne.x));
 672         }
 673
 674         return ((sel.nb.y < y && y < sel.ne.y)
 675                 || (y == sel.ne.y && x <= sel.ne.x))
 676                 || (y == sel.nb.y && x >= sel.nb.x
 677                         && (x <= sel.ne.x || sel.nb.y != sel.ne.y));
 678 }
 679
 680 void
 681 selsnap(int mode, int *x, int *y, int direction) {
 682         int i;
 683
 684         switch(mode) {
 685         case SNAP_WORD:
 686                 /*
 687                  * Snap around if the word wraps around at the end or
 688                  * beginning of a line.
 689                  */
 690                 for(;;) {
 691                         if(direction < 0 && *x <= 0) {
 692                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 693                                                 & ATTR_WRAP) {
 694                                         *y -= 1;
 695                                         *x = term.col-1;
 696                                 } else {
 697                                         break;
 698                                 }
 699                         }
 700                         if(direction > 0 && *x >= term.col-1) {
 701                                 if(*y < term.row-1 && term.line[*y][*x].mode
 702                                                 & ATTR_WRAP) {
 703                                         *y += 1;
 704                                         *x = 0;
 705                                 } else {
 706                                         break;
 707                                 }
 708                         }
 709
 710                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 711                                 *x += direction;
 712                                 continue;
 713                         }
 714
 715                         if(strchr(worddelimiters,
 716                                         term.line[*y][*x+direction].c[0])) {
 717                                 break;
 718                         }
 719
 720                         *x += direction;
 721                 }
 722                 break;
 723         case SNAP_LINE:
 724                 /*
 725                  * Snap around if the the previous line or the current one
 726                  * has set ATTR_WRAP at its end. Then the whole next or
 727                  * previous line will be selected.
 728                  */
 729                 *x = (direction < 0) ? 0 : term.col - 1;
 730                 if(direction < 0 && *y > 0) {
 731                         for(; *y > 0; *y += direction) {
 732                                 if(!(term.line[*y-1][term.col-1].mode
 733                                                 & ATTR_WRAP)) {
 734                                         break;
 735                                 }
 736                         }
 737                 } else if(direction > 0 && *y < term.row-1) {
 738                         for(; *y < term.row; *y += direction) {
 739                                 if(!(term.line[*y][term.col-1].mode
 740                                                 & ATTR_WRAP)) {
 741                                         break;
 742                                 }
 743                         }
 744                 }
 745                 break;
 746         default:
 747                 /*
 748                  * Select the whole line when the end of line is reached.
 749                  */
 750                 if(direction > 0) {
 751                         i = term.col;
 752                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 753                                 /* nothing */;
 754                         if(i > 0 && i < *x)
 755                                 *x = term.col - 1;
 756                 }
 757                 break;
 758         }
 759 }
 760
 761 void
 762 getbuttoninfo(XEvent *e) {
 763         int type;
 764         uint state = e->xbutton.state &~Button1Mask;
 765
 766         sel.alt = IS_SET(MODE_ALTSCREEN);
 767
 768         sel.oe.x = x2col(e->xbutton.x);
 769         sel.oe.y = y2row(e->xbutton.y);
 770
 771         if(sel.ob.y < sel.oe.y
 772                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 773                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 774                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 775         } else {
 776                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 777                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 778         }
 779         selsort();
 780
 781         sel.type = SEL_REGULAR;
 782         for(type = 1; type < LEN(selmasks); ++type) {
 783                 if(match(selmasks[type], state)) {
 784                         sel.type = type;
 785                         break;
 786                 }
 787         }
 788 }
 789
 790 void
 791 mousereport(XEvent *e) {
 792         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 793             button = e->xbutton.button, state = e->xbutton.state,
 794             len;
 795         char buf[40];
 796         static int ox, oy;
 797
 798         /* from urxvt */
 799         if(e->xbutton.type == MotionNotify) {
 800                 if(x == ox && y == oy)
 801                         return;
 802                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 803                         return;
 804                 /* MOUSE_MOTION: no reporting if no button is pressed */
 805                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 806                         return;
 807
 808                 button = oldbutton + 32;
 809                 ox = x;
 810                 oy = y;
 811         } else {
 812                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 813                         button = 3;
 814                 } else {
 815                         button -= Button1;
 816                         if(button >= 3)
 817                                 button += 64 - 3;
 818                 }
 819                 if(e->xbutton.type == ButtonPress) {
 820                         oldbutton = button;
 821                         ox = x;
 822                         oy = y;
 823                 } else if(e->xbutton.type == ButtonRelease) {
 824                         oldbutton = 3;
 825                         /* MODE_MOUSEX10: no button release reporting */
 826                         if(IS_SET(MODE_MOUSEX10))
 827                                 return;
 828                 }
 829         }
 830
 831         if(!IS_SET(MODE_MOUSEX10)) {
 832                 button += (state & ShiftMask   ? 4  : 0)
 833                         + (state & Mod4Mask    ? 8  : 0)
 834                         + (state & ControlMask ? 16 : 0);
 835         }
 836
 837         len = 0;
 838         if(IS_SET(MODE_MOUSESGR)) {
 839                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 840                                 button, x+1, y+1,
 841                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 842         } else if(x < 223 && y < 223) {
 843                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 844                                 32+button, 32+x+1, 32+y+1);
 845         } else {
 846                 return;
 847         }
 848
 849         ttywrite(buf, len);
 850 }
 851
 852 void
 853 bpress(XEvent *e) {
 854         struct timeval now;
 855         Mousekey *mk;
 856
 857         if(IS_SET(MODE_MOUSE)) {
 858                 mousereport(e);
 859                 return;
 860         }
 861
 862         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 863                 if(e->xbutton.button == mk->b
 864                                 && match(mk->mask, e->xbutton.state)) {
 865                         ttysend(mk->s, strlen(mk->s));
 866                         return;
 867                 }
 868         }
 869
 870         if(e->xbutton.button == Button1) {
 871                 gettimeofday(&now, NULL);
 872
 873                 /* Clear previous selection, logically and visually. */
 874                 selclear(NULL);
 875                 sel.mode = 1;
 876                 sel.type = SEL_REGULAR;
 877                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 878                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 879
 880                 /*
 881                  * If the user clicks below predefined timeouts specific
 882                  * snapping behaviour is exposed.
 883                  */
 884                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 885                         sel.snap = SNAP_LINE;
 886                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 887                         sel.snap = SNAP_WORD;
 888                 } else {
 889                         sel.snap = 0;
 890                 }
 891                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 892                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 893                 selsort();
 894
 895                 /*
 896                  * Draw selection, unless it's regular and we don't want to
 897                  * make clicks visible
 898                  */
 899                 if(sel.snap != 0) {
 900                         sel.mode++;
 901                         tsetdirt(sel.nb.y, sel.ne.y);
 902                 }
 903                 sel.tclick2 = sel.tclick1;
 904                 sel.tclick1 = now;
 905         }
 906 }
 907
 908 char *
 909 getsel(void) {
 910         char *str, *ptr;
 911         int x, y, bufsize, size, i, ex;
 912         Glyph *gp, *last;
 913
 914         if(sel.ob.x == -1) {
 915                 str = NULL;
 916         } else {
 917                 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 918                 ptr = str = xmalloc(bufsize);
 919
 920                 /* append every set & selected glyph to the selection */
 921                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 922                         gp = &term.line[y][0];
 923                         last = &gp[term.col-1];
 924
 925                         while(last >= gp && !(selected(last - gp, y) &&
 926                                               strcmp(last->c, " ") != 0)) {
 927                                 --last;
 928                         }
 929
 930                         for(x = 0; gp <= last; x++, ++gp) {
 931                                 if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 932                                         continue;
 933
 934                                 size = utf8len(gp->c);
 935                                 memcpy(ptr, gp->c, size);
 936                                 ptr += size;
 937                         }
 938
 939                         /*
 940                          * Copy and pasting of line endings is inconsistent
 941                          * in the inconsistent terminal and GUI world.
 942                          * The best solution seems like to produce '\n' when
 943                          * something is copied from st and convert '\n' to
 944                          * '\r', when something to be pasted is received by
 945                          * st.
 946                          * FIXME: Fix the computer world.
 947                          */
 948                         if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
 949                                 *ptr++ = '\n';
 950
 951                         /*
 952                          * If the last selected line expands in the selection
 953                          * after the visible text '\n' is appended.
 954                          */
 955                         if(y == sel.ne.y) {
 956                                 i = term.col;
 957                                 while(--i > 0 && term.line[y][i].c[0] == ' ')
 958                                         /* nothing */;
 959                                 ex = sel.ne.x;
 960                                 if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 961                                         ex = sel.nb.x;
 962                                 if(i < ex)
 963                                         *ptr++ = '\n';
 964                         }
 965                 }
 966                 *ptr = 0;
 967         }
 968         return str;
 969 }
 970
 971 void
 972 selcopy(void) {
 973         xsetsel(getsel());
 974 }
 975
 976 void
 977 selnotify(XEvent *e) {
 978         ulong nitems, ofs, rem;
 979         int format;
 980         uchar *data, *last, *repl;
 981         Atom type;
 982
 983         ofs = 0;
 984         do {
 985                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 986                                         False, AnyPropertyType, &type, &format,
 987                                         &nitems, &rem, &data)) {
 988                         fprintf(stderr, "Clipboard allocation failed\n");
 989                         return;
 990                 }
 991
 992                 /*
 993                  * As seen in selcopy:
 994                  * Line endings are inconsistent in the terminal and GUI world
 995                  * copy and pasting. When receiving some selection data,
 996                  * replace all '\n' with '\r'.
 997                  * FIXME: Fix the computer world.
 998                  */
 999                 repl = data;
1000                 last = data + nitems * format / 8;
1001                 while((repl = memchr(repl, '\n', last - repl))) {
1002                         *repl++ = '\r';
1003                 }
1004
1005                 if(IS_SET(MODE_BRCKTPASTE))
1006                         ttywrite("\033[200~", 6);
1007                 ttysend((char *)data, nitems * format / 8);
1008                 if(IS_SET(MODE_BRCKTPASTE))
1009                         ttywrite("\033[201~", 6);
1010                 XFree(data);
1011                 /* number of 32-bit chunks returned */
1012                 ofs += nitems * format / 32;
1013         } while(rem > 0);
1014 }
1015
1016 void
1017 selpaste(const Arg *dummy) {
1018         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1019                         xw.win, CurrentTime);
1020 }
1021
1022 void
1023 clippaste(const Arg *dummy) {
1024         Atom clipboard;
1025
1026         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1027         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1028                         xw.win, CurrentTime);
1029 }
1030
1031 void
1032 selclear(XEvent *e) {
1033         if(sel.ob.x == -1)
1034                 return;
1035         sel.ob.x = -1;
1036         tsetdirt(sel.nb.y, sel.ne.y);
1037 }
1038
1039 void
1040 selrequest(XEvent *e) {
1041         XSelectionRequestEvent *xsre;
1042         XSelectionEvent xev;
1043         Atom xa_targets, string;
1044
1045         xsre = (XSelectionRequestEvent *) e;
1046         xev.type = SelectionNotify;
1047         xev.requestor = xsre->requestor;
1048         xev.selection = xsre->selection;
1049         xev.target = xsre->target;
1050         xev.time = xsre->time;
1051         /* reject */
1052         xev.property = None;
1053
1054         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1055         if(xsre->target == xa_targets) {
1056                 /* respond with the supported type */
1057                 string = sel.xtarget;
1058                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1059                                 XA_ATOM, 32, PropModeReplace,
1060                                 (uchar *) &string, 1);
1061                 xev.property = xsre->property;
1062         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1063                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1064                                 xsre->target, 8, PropModeReplace,
1065                                 (uchar *) sel.clip, strlen(sel.clip));
1066                 xev.property = xsre->property;
1067         }
1068
1069         /* all done, send a notification to the listener */
1070         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1071                 fprintf(stderr, "Error sending SelectionNotify event\n");
1072 }
1073
1074 void
1075 xsetsel(char *str) {
1076         /* register the selection for both the clipboard and the primary */
1077         Atom clipboard;
1078
1079         free(sel.clip);
1080         sel.clip = str;
1081
1082         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1083
1084         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1085         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1086 }
1087
1088 void
1089 brelease(XEvent *e) {
1090         if(IS_SET(MODE_MOUSE)) {
1091                 mousereport(e);
1092                 return;
1093         }
1094
1095         if(e->xbutton.button == Button2) {
1096                 selpaste(NULL);
1097         } else if(e->xbutton.button == Button1) {
1098                 if(sel.mode < 2) {
1099                         selclear(NULL);
1100                 } else {
1101                         getbuttoninfo(e);
1102                         selcopy();
1103                 }
1104                 sel.mode = 0;
1105                 tsetdirt(sel.nb.y, sel.ne.y);
1106         }
1107 }
1108
1109 void
1110 bmotion(XEvent *e) {
1111         int oldey, oldex, oldsby, oldsey;
1112
1113         if(IS_SET(MODE_MOUSE)) {
1114                 mousereport(e);
1115                 return;
1116         }
1117
1118         if(!sel.mode)
1119                 return;
1120
1121         sel.mode++;
1122         oldey = sel.oe.y;
1123         oldex = sel.oe.x;
1124         oldsby = sel.nb.y;
1125         oldsey = sel.ne.y;
1126         getbuttoninfo(e);
1127
1128         if(oldey != sel.oe.y || oldex != sel.oe.x)
1129                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1130 }
1131
1132 void
1133 die(const char *errstr, ...) {
1134         va_list ap;
1135
1136         va_start(ap, errstr);
1137         vfprintf(stderr, errstr, ap);
1138         va_end(ap);
1139         exit(EXIT_FAILURE);
1140 }
1141
1142 void
1143 execsh(void) {
1144         char **args;
1145         char *envshell = getenv("SHELL");
1146         const struct passwd *pass = getpwuid(getuid());
1147         char buf[sizeof(long) * 8 + 1];
1148
1149         unsetenv("COLUMNS");
1150         unsetenv("LINES");
1151         unsetenv("TERMCAP");
1152
1153         if(pass) {
1154                 setenv("LOGNAME", pass->pw_name, 1);
1155                 setenv("USER", pass->pw_name, 1);
1156                 setenv("SHELL", pass->pw_shell, 0);
1157                 setenv("HOME", pass->pw_dir, 0);
1158         }
1159
1160         snprintf(buf, sizeof(buf), "%lu", xw.win);
1161         setenv("WINDOWID", buf, 1);
1162
1163         signal(SIGCHLD, SIG_DFL);
1164         signal(SIGHUP, SIG_DFL);
1165         signal(SIGINT, SIG_DFL);
1166         signal(SIGQUIT, SIG_DFL);
1167         signal(SIGTERM, SIG_DFL);
1168         signal(SIGALRM, SIG_DFL);
1169
1170         DEFAULT(envshell, shell);
1171         setenv("TERM", termname, 1);
1172         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1173         execvp(args[0], args);
1174         exit(EXIT_FAILURE);
1175 }
1176
1177 void
1178 sigchld(int a) {
1179         int stat = 0;
1180
1181         if(waitpid(pid, &stat, 0) < 0)
1182                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1183
1184         if(WIFEXITED(stat)) {
1185                 exit(WEXITSTATUS(stat));
1186         } else {
1187                 exit(EXIT_FAILURE);
1188         }
1189 }
1190
1191 void
1192 ttynew(void) {
1193         int m, s;
1194         struct winsize w = {term.row, term.col, 0, 0};
1195
1196         /* seems to work fine on linux, openbsd and freebsd */
1197         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1198                 die("openpty failed: %s\n", strerror(errno));
1199
1200         switch(pid = fork()) {
1201         case -1:
1202                 die("fork failed\n");
1203                 break;
1204         case 0:
1205                 setsid(); /* create a new process group */
1206                 dup2(s, STDIN_FILENO);
1207                 dup2(s, STDOUT_FILENO);
1208                 dup2(s, STDERR_FILENO);
1209                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1210                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1211                 close(s);
1212                 close(m);
1213                 execsh();
1214                 break;
1215         default:
1216                 close(s);
1217                 cmdfd = m;
1218                 signal(SIGCHLD, sigchld);
1219                 if(opt_io) {
1220                         term.mode |= MODE_PRINT;
1221                         iofd = (!strcmp(opt_io, "-")) ?
1222                                   STDOUT_FILENO :
1223                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1224                         if(iofd < 0) {
1225                                 fprintf(stderr, "Error opening %s:%s\n",
1226                                         opt_io, strerror(errno));
1227                         }
1228                 }
1229         }
1230 }
1231
1232 void
1233 dump(char c) {
1234         static int col;
1235
1236         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1237         if(++col % 10 == 0)
1238                 fprintf(stderr, "\n");
1239 }
1240
1241 void
1242 ttyread(void) {
1243         static char buf[BUFSIZ];
1244         static int buflen = 0;
1245         char *ptr;
1246         char s[UTF_SIZ];
1247         int charsize; /* size of utf8 char in bytes */
1248         long unicodep;
1249         int ret;
1250
1251         /* append read bytes to unprocessed bytes */
1252         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1253                 die("Couldn't read from shell: %s\n", strerror(errno));
1254
1255         /* process every complete utf8 char */
1256         buflen += ret;
1257         ptr = buf;
1258         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1259                 utf8encode(unicodep, s, UTF_SIZ);
1260                 tputc(s, charsize);
1261                 ptr += charsize;
1262                 buflen -= charsize;
1263         }
1264
1265         /* keep any uncomplete utf8 char for the next call */
1266         memmove(buf, ptr, buflen);
1267 }
1268
1269 void
1270 ttywrite(const char *s, size_t n) {
1271         if(write(cmdfd, s, n) == -1)
1272                 die("write error on tty: %s\n", strerror(errno));
1273 }
1274
1275 void
1276 ttysend(char *s, size_t n) {
1277         ttywrite(s, n);
1278         if(IS_SET(MODE_ECHO))
1279                 techo(s, n);
1280 }
1281
1282 void
1283 ttyresize(void) {
1284         struct winsize w;
1285
1286         w.ws_row = term.row;
1287         w.ws_col = term.col;
1288         w.ws_xpixel = xw.tw;
1289         w.ws_ypixel = xw.th;
1290         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1291                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1292 }
1293
1294 int
1295 tattrset(int attr) {
1296         int i, j;
1297
1298         for(i = 0; i < term.row-1; i++) {
1299                 for(j = 0; j < term.col-1; j++) {
1300                         if(term.line[i][j].mode & attr)
1301                                 return 1;
1302                 }
1303         }
1304
1305         return 0;
1306 }
1307
1308 void
1309 tsetdirt(int top, int bot) {
1310         int i;
1311
1312         LIMIT(top, 0, term.row-1);
1313         LIMIT(bot, 0, term.row-1);
1314
1315         for(i = top; i <= bot; i++)
1316                 term.dirty[i] = 1;
1317 }
1318
1319 void
1320 tsetdirtattr(int attr) {
1321         int i, j;
1322
1323         for(i = 0; i < term.row-1; i++) {
1324                 for(j = 0; j < term.col-1; j++) {
1325                         if(term.line[i][j].mode & attr) {
1326                                 tsetdirt(i, i);
1327                                 break;
1328                         }
1329                 }
1330         }
1331 }
1332
1333 void
1334 tfulldirt(void) {
1335         tsetdirt(0, term.row-1);
1336 }
1337
1338 void
1339 tcursor(int mode) {
1340         static TCursor c[2];
1341         bool alt = IS_SET(MODE_ALTSCREEN);
1342
1343         if(mode == CURSOR_SAVE) {
1344                 c[alt] = term.c;
1345         } else if(mode == CURSOR_LOAD) {
1346                 term.c = c[alt];
1347                 tmoveto(c[alt].x, c[alt].y);
1348         }
1349 }
1350
1351 void
1352 treset(void) {
1353         uint i;
1354
1355         term.c = (TCursor){{
1356                 .mode = ATTR_NULL,
1357                 .fg = defaultfg,
1358                 .bg = defaultbg
1359         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1360
1361         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1362         for(i = tabspaces; i < term.col; i += tabspaces)
1363                 term.tabs[i] = 1;
1364         term.top = 0;
1365         term.bot = term.row - 1;
1366         term.mode = MODE_WRAP;
1367         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1368         term.charset = 0;
1369
1370         tclearregion(0, 0, term.col-1, term.row-1);
1371         tmoveto(0, 0);
1372         tcursor(CURSOR_SAVE);
1373 }
1374
1375 void
1376 tnew(int col, int row) {
1377         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1378         tresize(col, row);
1379         term.numlock = 1;
1380
1381         treset();
1382 }
1383
1384 void
1385 tswapscreen(void) {
1386         Line *tmp = term.line;
1387
1388         term.line = term.alt;
1389         term.alt = tmp;
1390         term.mode ^= MODE_ALTSCREEN;
1391         tfulldirt();
1392 }
1393
1394 void
1395 tscrolldown(int orig, int n) {
1396         int i;
1397         Line temp;
1398
1399         LIMIT(n, 0, term.bot-orig+1);
1400
1401         tsetdirt(orig, term.bot-n);
1402         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1403
1404         for(i = term.bot; i >= orig+n; i--) {
1405                 temp = term.line[i];
1406                 term.line[i] = term.line[i-n];
1407                 term.line[i-n] = temp;
1408         }
1409
1410         selscroll(orig, n);
1411 }
1412
1413 void
1414 tscrollup(int orig, int n) {
1415         int i;
1416         Line temp;
1417
1418         LIMIT(n, 0, term.bot-orig+1);
1419
1420         tclearregion(0, orig, term.col-1, orig+n-1);
1421         tsetdirt(orig+n, term.bot);
1422
1423         for(i = orig; i <= term.bot-n; i++) {
1424                 temp = term.line[i];
1425                 term.line[i] = term.line[i+n];
1426                 term.line[i+n] = temp;
1427         }
1428
1429         selscroll(orig, -n);
1430 }
1431
1432 void
1433 selscroll(int orig, int n) {
1434         if(sel.ob.x == -1)
1435                 return;
1436
1437         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1438                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1439                         selclear(NULL);
1440                         return;
1441                 }
1442                 if(sel.type == SEL_RECTANGULAR) {
1443                         if(sel.ob.y < term.top)
1444                                 sel.ob.y = term.top;
1445                         if(sel.oe.y > term.bot)
1446                                 sel.oe.y = term.bot;
1447                 } else {
1448                         if(sel.ob.y < term.top) {
1449                                 sel.ob.y = term.top;
1450                                 sel.ob.x = 0;
1451                         }
1452                         if(sel.oe.y > term.bot) {
1453                                 sel.oe.y = term.bot;
1454                                 sel.oe.x = term.col;
1455                         }
1456                 }
1457                 selsort();
1458         }
1459 }
1460
1461 void
1462 tnewline(int first_col) {
1463         int y = term.c.y;
1464
1465         if(y == term.bot) {
1466                 tscrollup(term.top, 1);
1467         } else {
1468                 y++;
1469         }
1470         tmoveto(first_col ? 0 : term.c.x, y);
1471 }
1472
1473 void
1474 csiparse(void) {
1475         char *p = csiescseq.buf, *np;
1476         long int v;
1477
1478         csiescseq.narg = 0;
1479         if(*p == '?') {
1480                 csiescseq.priv = 1;
1481                 p++;
1482         }
1483
1484         csiescseq.buf[csiescseq.len] = '\0';
1485         while(p < csiescseq.buf+csiescseq.len) {
1486                 np = NULL;
1487                 v = strtol(p, &np, 10);
1488                 if(np == p)
1489                         v = 0;
1490                 if(v == LONG_MAX || v == LONG_MIN)
1491                         v = -1;
1492                 csiescseq.arg[csiescseq.narg++] = v;
1493                 p = np;
1494                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1495                         break;
1496                 p++;
1497         }
1498         csiescseq.mode = *p;
1499 }
1500
1501 /* for absolute user moves, when decom is set */
1502 void
1503 tmoveato(int x, int y) {
1504         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1505 }
1506
1507 void
1508 tmoveto(int x, int y) {
1509         int miny, maxy;
1510
1511         if(term.c.state & CURSOR_ORIGIN) {
1512                 miny = term.top;
1513                 maxy = term.bot;
1514         } else {
1515                 miny = 0;
1516                 maxy = term.row - 1;
1517         }
1518         LIMIT(x, 0, term.col-1);
1519         LIMIT(y, miny, maxy);
1520         term.c.state &= ~CURSOR_WRAPNEXT;
1521         term.c.x = x;
1522         term.c.y = y;
1523 }
1524
1525 void
1526 tsetchar(char *c, Glyph *attr, int x, int y) {
1527         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1528                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1529                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1530                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1531                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1532                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1533                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1534                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1535                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1536         };
1537
1538         /*
1539          * The table is proudly stolen from rxvt.
1540          */
1541         if(attr->mode & ATTR_GFX) {
1542                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1543                         c = vt100_0[c[0] - 0x41];
1544                 }
1545         }
1546
1547         if(term.line[y][x].mode & ATTR_WIDE) {
1548                 if(x+1 < term.col) {
1549                         term.line[y][x+1].c[0] = ' ';
1550                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1551                 }
1552         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1553                 term.line[y][x-1].c[0] = ' ';
1554                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1555         }
1556
1557         term.dirty[y] = 1;
1558         term.line[y][x] = *attr;
1559         memcpy(term.line[y][x].c, c, UTF_SIZ);
1560 }
1561
1562 void
1563 tclearregion(int x1, int y1, int x2, int y2) {
1564         int x, y, temp;
1565
1566         if(x1 > x2)
1567                 temp = x1, x1 = x2, x2 = temp;
1568         if(y1 > y2)
1569                 temp = y1, y1 = y2, y2 = temp;
1570
1571         LIMIT(x1, 0, term.col-1);
1572         LIMIT(x2, 0, term.col-1);
1573         LIMIT(y1, 0, term.row-1);
1574         LIMIT(y2, 0, term.row-1);
1575
1576         for(y = y1; y <= y2; y++) {
1577                 term.dirty[y] = 1;
1578                 for(x = x1; x <= x2; x++) {
1579                         if(selected(x, y))
1580                                 selclear(NULL);
1581                         term.line[y][x] = term.c.attr;
1582                         memcpy(term.line[y][x].c, " ", 2);
1583                 }
1584         }
1585 }
1586
1587 void
1588 tdeletechar(int n) {
1589         int src = term.c.x + n;
1590         int dst = term.c.x;
1591         int size = term.col - src;
1592
1593         term.dirty[term.c.y] = 1;
1594
1595         if(src >= term.col) {
1596                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1597                 return;
1598         }
1599
1600         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1601                         size * sizeof(Glyph));
1602         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1603 }
1604
1605 void
1606 tinsertblank(int n) {
1607         int src = term.c.x;
1608         int dst = src + n;
1609         int size = term.col - dst;
1610
1611         term.dirty[term.c.y] = 1;
1612
1613         if(dst >= term.col) {
1614                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1615                 return;
1616         }
1617
1618         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1619                         size * sizeof(Glyph));
1620         tclearregion(src, term.c.y, dst - 1, term.c.y);
1621 }
1622
1623 void
1624 tinsertblankline(int n) {
1625         if(BETWEEN(term.c.y, term.top, term.bot))
1626                 tscrolldown(term.c.y, n);
1627 }
1628
1629 void
1630 tdeleteline(int n) {
1631         if(BETWEEN(term.c.y, term.top, term.bot))
1632                 tscrollup(term.c.y, n);
1633 }
1634
1635 int32_t
1636 tdefcolor(int *attr, int *npar, int l) {
1637         int32_t idx = -1;
1638         uint r, g, b;
1639
1640         switch (attr[*npar + 1]) {
1641         case 2: /* direct colour in RGB space */
1642                 if (*npar + 4 >= l) {
1643                         fprintf(stderr,
1644                                 "erresc(38): Incorrect number of parameters (%d)\n",
1645                                 *npar);
1646                         break;
1647                 }
1648                 r = attr[*npar + 2];
1649                 g = attr[*npar + 3];
1650                 b = attr[*npar + 4];
1651                 *npar += 4;
1652                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1653                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1654                                 r, g, b);
1655                 else
1656                         idx = TRUECOLOR(r, g, b);
1657                 break;
1658         case 5: /* indexed colour */
1659                 if (*npar + 2 >= l) {
1660                         fprintf(stderr,
1661                                 "erresc(38): Incorrect number of parameters (%d)\n",
1662                                 *npar);
1663                         break;
1664                 }
1665                 *npar += 2;
1666                 if(!BETWEEN(attr[*npar], 0, 255))
1667                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1668                 else
1669                         idx = attr[*npar];
1670                 break;
1671         case 0: /* implemented defined (only foreground) */
1672         case 1: /* transparent */
1673         case 3: /* direct colour in CMY space */
1674         case 4: /* direct colour in CMYK space */
1675         default:
1676                 fprintf(stderr,
1677                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1678         }
1679
1680         return idx;
1681 }
1682
1683 void
1684 tsetattr(int *attr, int l) {
1685         int i;
1686         int32_t idx;
1687
1688         for(i = 0; i < l; i++) {
1689                 switch(attr[i]) {
1690                 case 0:
1691                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1692                                         | ATTR_BOLD | ATTR_ITALIC \
1693                                         | ATTR_BLINK);
1694                         term.c.attr.fg = defaultfg;
1695                         term.c.attr.bg = defaultbg;
1696                         break;
1697                 case 1:
1698                         term.c.attr.mode |= ATTR_BOLD;
1699                         break;
1700                 case 3:
1701                         term.c.attr.mode |= ATTR_ITALIC;
1702                         break;
1703                 case 4:
1704                         term.c.attr.mode |= ATTR_UNDERLINE;
1705                         break;
1706                 case 5: /* slow blink */
1707                 case 6: /* rapid blink */
1708                         term.c.attr.mode |= ATTR_BLINK;
1709                         break;
1710                 case 7:
1711                         term.c.attr.mode |= ATTR_REVERSE;
1712                         break;
1713                 case 21:
1714                 case 22:
1715                         term.c.attr.mode &= ~ATTR_BOLD;
1716                         break;
1717                 case 23:
1718                         term.c.attr.mode &= ~ATTR_ITALIC;
1719                         break;
1720                 case 24:
1721                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1722                         break;
1723                 case 25:
1724                 case 26:
1725                         term.c.attr.mode &= ~ATTR_BLINK;
1726                         break;
1727                 case 27:
1728                         term.c.attr.mode &= ~ATTR_REVERSE;
1729                         break;
1730                 case 38:
1731                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1732                                 term.c.attr.fg = idx;
1733                         break;
1734                 case 39:
1735                         term.c.attr.fg = defaultfg;
1736                         break;
1737                 case 48:
1738                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1739                                 term.c.attr.bg = idx;
1740                         break;
1741                 case 49:
1742                         term.c.attr.bg = defaultbg;
1743                         break;
1744                 default:
1745                         if(BETWEEN(attr[i], 30, 37)) {
1746                                 term.c.attr.fg = attr[i] - 30;
1747                         } else if(BETWEEN(attr[i], 40, 47)) {
1748                                 term.c.attr.bg = attr[i] - 40;
1749                         } else if(BETWEEN(attr[i], 90, 97)) {
1750                                 term.c.attr.fg = attr[i] - 90 + 8;
1751                         } else if(BETWEEN(attr[i], 100, 107)) {
1752                                 term.c.attr.bg = attr[i] - 100 + 8;
1753                         } else {
1754                                 fprintf(stderr,
1755                                         "erresc(default): gfx attr %d unknown\n",
1756                                         attr[i]), csidump();
1757                         }
1758                         break;
1759                 }
1760         }
1761 }
1762
1763 void
1764 tsetscroll(int t, int b) {
1765         int temp;
1766
1767         LIMIT(t, 0, term.row-1);
1768         LIMIT(b, 0, term.row-1);
1769         if(t > b) {
1770                 temp = t;
1771                 t = b;
1772                 b = temp;
1773         }
1774         term.top = t;
1775         term.bot = b;
1776 }
1777
1778 void
1779 tsetmode(bool priv, bool set, int *args, int narg) {
1780         int *lim, mode;
1781         bool alt;
1782
1783         for(lim = args + narg; args < lim; ++args) {
1784                 if(priv) {
1785                         switch(*args) {
1786                                 break;
1787                         case 1: /* DECCKM -- Cursor key */
1788                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1789                                 break;
1790                         case 5: /* DECSCNM -- Reverse video */
1791                                 mode = term.mode;
1792                                 MODBIT(term.mode, set, MODE_REVERSE);
1793                                 if(mode != term.mode)
1794                                         redraw(REDRAW_TIMEOUT);
1795                                 break;
1796                         case 6: /* DECOM -- Origin */
1797                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1798                                 tmoveato(0, 0);
1799                                 break;
1800                         case 7: /* DECAWM -- Auto wrap */
1801                                 MODBIT(term.mode, set, MODE_WRAP);
1802                                 break;
1803                         case 0:  /* Error (IGNORED) */
1804                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1805                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1806                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1807                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1808                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1809                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1810                         case 42: /* DECNRCM -- National characters (IGNORED) */
1811                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1812                                 break;
1813                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1814                                 MODBIT(term.mode, !set, MODE_HIDE);
1815                                 break;
1816                         case 9:    /* X10 mouse compatibility mode */
1817                                 xsetpointermotion(0);
1818                                 MODBIT(term.mode, 0, MODE_MOUSE);
1819                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1820                                 break;
1821                         case 1000: /* 1000: report button press */
1822                                 xsetpointermotion(0);
1823                                 MODBIT(term.mode, 0, MODE_MOUSE);
1824                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1825                                 break;
1826                         case 1002: /* 1002: report motion on button press */
1827                                 xsetpointermotion(0);
1828                                 MODBIT(term.mode, 0, MODE_MOUSE);
1829                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1830                                 break;
1831                         case 1003: /* 1003: enable all mouse motions */
1832                                 xsetpointermotion(set);
1833                                 MODBIT(term.mode, 0, MODE_MOUSE);
1834                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1835                                 break;
1836                         case 1004: /* 1004: send focus events to tty */
1837                                 MODBIT(term.mode, set, MODE_FOCUS);
1838                                 break;
1839                         case 1006: /* 1006: extended reporting mode */
1840                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1841                                 break;
1842                         case 1034:
1843                                 MODBIT(term.mode, set, MODE_8BIT);
1844                                 break;
1845                         case 1049: /* swap screen & set/restore cursor as xterm */
1846                                 if (!allowaltscreen)
1847                                         break;
1848                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1849                                 /* FALLTHRU */
1850                         case 47: /* swap screen */
1851                         case 1047:
1852                                 if (!allowaltscreen)
1853                                         break;
1854                                 alt = IS_SET(MODE_ALTSCREEN);
1855                                 if(alt) {
1856                                         tclearregion(0, 0, term.col-1,
1857                                                         term.row-1);
1858                                 }
1859                                 if(set ^ alt) /* set is always 1 or 0 */
1860                                         tswapscreen();
1861                                 if(*args != 1049)
1862                                         break;
1863                                 /* FALLTRU */
1864                         case 1048:
1865                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1866                                 break;
1867                         case 2004: /* 2004: bracketed paste mode */
1868                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1869                                 break;
1870                         /* Not implemented mouse modes. See comments there. */
1871                         case 1001: /* mouse highlight mode; can hang the
1872                                       terminal by design when implemented. */
1873                         case 1005: /* UTF-8 mouse mode; will confuse
1874                                       applications not supporting UTF-8
1875                                       and luit. */
1876                         case 1015: /* urxvt mangled mouse mode; incompatible
1877                                       and can be mistaken for other control
1878                                       codes. */
1879                         default:
1880                                 fprintf(stderr,
1881                                         "erresc: unknown private set/reset mode %d\n",
1882                                         *args);
1883                                 break;
1884                         }
1885                 } else {
1886                         switch(*args) {
1887                         case 0:  /* Error (IGNORED) */
1888                                 break;
1889                         case 2:  /* KAM -- keyboard action */
1890                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1891                                 break;
1892                         case 4:  /* IRM -- Insertion-replacement */
1893                                 MODBIT(term.mode, set, MODE_INSERT);
1894                                 break;
1895                         case 12: /* SRM -- Send/Receive */
1896                                 MODBIT(term.mode, !set, MODE_ECHO);
1897                                 break;
1898                         case 20: /* LNM -- Linefeed/new line */
1899                                 MODBIT(term.mode, set, MODE_CRLF);
1900                                 break;
1901                         default:
1902                                 fprintf(stderr,
1903                                         "erresc: unknown set/reset mode %d\n",
1904                                         *args);
1905                                 break;
1906                         }
1907                 }
1908         }
1909 }
1910
1911 void
1912 csihandle(void) {
1913         char buf[40];
1914         int len;
1915
1916         switch(csiescseq.mode) {
1917         default:
1918         unknown:
1919                 fprintf(stderr, "erresc: unknown csi ");
1920                 csidump();
1921                 /* die(""); */
1922                 break;
1923         case '@': /* ICH -- Insert <n> blank char */
1924                 DEFAULT(csiescseq.arg[0], 1);
1925                 tinsertblank(csiescseq.arg[0]);
1926                 break;
1927         case 'A': /* CUU -- Cursor <n> Up */
1928                 DEFAULT(csiescseq.arg[0], 1);
1929                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1930                 break;
1931         case 'B': /* CUD -- Cursor <n> Down */
1932         case 'e': /* VPR --Cursor <n> Down */
1933                 DEFAULT(csiescseq.arg[0], 1);
1934                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1935                 break;
1936         case 'i': /* MC -- Media Copy */
1937                 switch(csiescseq.arg[0]) {
1938                 case 0:
1939                         tdump();
1940                         break;
1941                 case 1:
1942                         tdumpline(term.c.y);
1943                         break;
1944                 case 2:
1945                         tdumpsel();
1946                         break;
1947                 case 4:
1948                         term.mode &= ~MODE_PRINT;
1949                         break;
1950                 case 5:
1951                         term.mode |= MODE_PRINT;
1952                         break;
1953                 }
1954                 break;
1955         case 'c': /* DA -- Device Attributes */
1956                 if(csiescseq.arg[0] == 0)
1957                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1958                 break;
1959         case 'C': /* CUF -- Cursor <n> Forward */
1960         case 'a': /* HPR -- Cursor <n> Forward */
1961                 DEFAULT(csiescseq.arg[0], 1);
1962                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1963                 break;
1964         case 'D': /* CUB -- Cursor <n> Backward */
1965                 DEFAULT(csiescseq.arg[0], 1);
1966                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1967                 break;
1968         case 'E': /* CNL -- Cursor <n> Down and first col */
1969                 DEFAULT(csiescseq.arg[0], 1);
1970                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1971                 break;
1972         case 'F': /* CPL -- Cursor <n> Up and first col */
1973                 DEFAULT(csiescseq.arg[0], 1);
1974                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1975                 break;
1976         case 'g': /* TBC -- Tabulation clear */
1977                 switch(csiescseq.arg[0]) {
1978                 case 0: /* clear current tab stop */
1979                         term.tabs[term.c.x] = 0;
1980                         break;
1981                 case 3: /* clear all the tabs */
1982                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1983                         break;
1984                 default:
1985                         goto unknown;
1986                 }
1987                 break;
1988         case 'G': /* CHA -- Move to <col> */
1989         case '`': /* HPA */
1990                 DEFAULT(csiescseq.arg[0], 1);
1991                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1992                 break;
1993         case 'H': /* CUP -- Move to <row> <col> */
1994         case 'f': /* HVP */
1995                 DEFAULT(csiescseq.arg[0], 1);
1996                 DEFAULT(csiescseq.arg[1], 1);
1997                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1998                 break;
1999         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2000                 DEFAULT(csiescseq.arg[0], 1);
2001                 while(csiescseq.arg[0]--)
2002                         tputtab(1);
2003                 break;
2004         case 'J': /* ED -- Clear screen */
2005                 selclear(NULL);
2006                 switch(csiescseq.arg[0]) {
2007                 case 0: /* below */
2008                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2009                         if(term.c.y < term.row-1) {
2010                                 tclearregion(0, term.c.y+1, term.col-1,
2011                                                 term.row-1);
2012                         }
2013                         break;
2014                 case 1: /* above */
2015                         if(term.c.y > 1)
2016                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2017                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2018                         break;
2019                 case 2: /* all */
2020                         tclearregion(0, 0, term.col-1, term.row-1);
2021                         break;
2022                 default:
2023                         goto unknown;
2024                 }
2025                 break;
2026         case 'K': /* EL -- Clear line */
2027                 switch(csiescseq.arg[0]) {
2028                 case 0: /* right */
2029                         tclearregion(term.c.x, term.c.y, term.col-1,
2030                                         term.c.y);
2031                         break;
2032                 case 1: /* left */
2033                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2034                         break;
2035                 case 2: /* all */
2036                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2037                         break;
2038                 }
2039                 break;
2040         case 'S': /* SU -- Scroll <n> line up */
2041                 DEFAULT(csiescseq.arg[0], 1);
2042                 tscrollup(term.top, csiescseq.arg[0]);
2043                 break;
2044         case 'T': /* SD -- Scroll <n> line down */
2045                 DEFAULT(csiescseq.arg[0], 1);
2046                 tscrolldown(term.top, csiescseq.arg[0]);
2047                 break;
2048         case 'L': /* IL -- Insert <n> blank lines */
2049                 DEFAULT(csiescseq.arg[0], 1);
2050                 tinsertblankline(csiescseq.arg[0]);
2051                 break;
2052         case 'l': /* RM -- Reset Mode */
2053                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2054                 break;
2055         case 'M': /* DL -- Delete <n> lines */
2056                 DEFAULT(csiescseq.arg[0], 1);
2057                 tdeleteline(csiescseq.arg[0]);
2058                 break;
2059         case 'X': /* ECH -- Erase <n> char */
2060                 DEFAULT(csiescseq.arg[0], 1);
2061                 tclearregion(term.c.x, term.c.y,
2062                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2063                 break;
2064         case 'P': /* DCH -- Delete <n> char */
2065                 DEFAULT(csiescseq.arg[0], 1);
2066                 tdeletechar(csiescseq.arg[0]);
2067                 break;
2068         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2069                 DEFAULT(csiescseq.arg[0], 1);
2070                 while(csiescseq.arg[0]--)
2071                         tputtab(0);
2072                 break;
2073         case 'd': /* VPA -- Move to <row> */
2074                 DEFAULT(csiescseq.arg[0], 1);
2075                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2076                 break;
2077         case 'h': /* SM -- Set terminal mode */
2078                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2079                 break;
2080         case 'm': /* SGR -- Terminal attribute (color) */
2081                 tsetattr(csiescseq.arg, csiescseq.narg);
2082                 break;
2083         case 'n': /* DSR – Device Status Report (cursor position) */
2084                 if (csiescseq.arg[0] == 6) {
2085                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2086                                         term.c.y+1, term.c.x+1);
2087                         ttywrite(buf, len);
2088                         break;
2089                 }
2090         case 'r': /* DECSTBM -- Set Scrolling Region */
2091                 if(csiescseq.priv) {
2092                         goto unknown;
2093                 } else {
2094                         DEFAULT(csiescseq.arg[0], 1);
2095                         DEFAULT(csiescseq.arg[1], term.row);
2096                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2097                         tmoveato(0, 0);
2098                 }
2099                 break;
2100         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2101                 tcursor(CURSOR_SAVE);
2102                 break;
2103         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2104                 tcursor(CURSOR_LOAD);
2105                 break;
2106         }
2107 }
2108
2109 void
2110 csidump(void) {
2111         int i;
2112         uint c;
2113
2114         printf("ESC[");
2115         for(i = 0; i < csiescseq.len; i++) {
2116                 c = csiescseq.buf[i] & 0xff;
2117                 if(isprint(c)) {
2118                         putchar(c);
2119                 } else if(c == '\n') {
2120                         printf("(\\n)");
2121                 } else if(c == '\r') {
2122                         printf("(\\r)");
2123                 } else if(c == 0x1b) {
2124                         printf("(\\e)");
2125                 } else {
2126                         printf("(%02x)", c);
2127                 }
2128         }
2129         putchar('\n');
2130 }
2131
2132 void
2133 csireset(void) {
2134         memset(&csiescseq, 0, sizeof(csiescseq));
2135 }
2136
2137 void
2138 strhandle(void) {
2139         char *p = NULL;
2140         int j, narg, par;
2141
2142         strparse();
2143         narg = strescseq.narg;
2144         par = atoi(strescseq.args[0]);
2145
2146         switch(strescseq.type) {
2147         case ']': /* OSC -- Operating System Command */
2148                 switch(par) {
2149                 case 0:
2150                 case 1:
2151                 case 2:
2152                         if(narg > 1)
2153                                 xsettitle(strescseq.args[1]);
2154                         return;
2155                 case 4: /* color set */
2156                         if(narg < 3)
2157                                 break;
2158                         p = strescseq.args[2];
2159                         /* fall through */
2160                 case 104: /* color reset, here p = NULL */
2161                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2162                         if (!xsetcolorname(j, p)) {
2163                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2164                         } else {
2165                                 /*
2166                                  * TODO if defaultbg color is changed, borders
2167                                  * are dirty
2168                                  */
2169                                 redraw(0);
2170                         }
2171                         return;
2172                 }
2173                 break;
2174         case 'k': /* old title set compatibility */
2175                 xsettitle(strescseq.args[0]);
2176                 return;
2177         case 'P': /* DSC -- Device Control String */
2178         case '_': /* APC -- Application Program Command */
2179         case '^': /* PM -- Privacy Message */
2180                 return;
2181         }
2182
2183         fprintf(stderr, "erresc: unknown str ");
2184         strdump();
2185 }
2186
2187 void
2188 strparse(void) {
2189         char *p = strescseq.buf;
2190
2191         strescseq.narg = 0;
2192         strescseq.buf[strescseq.len] = '\0';
2193         while(p && strescseq.narg < STR_ARG_SIZ)
2194                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2195 }
2196
2197 void
2198 strdump(void) {
2199         int i;
2200         uint c;
2201
2202         printf("ESC%c", strescseq.type);
2203         for(i = 0; i < strescseq.len; i++) {
2204                 c = strescseq.buf[i] & 0xff;
2205                 if(c == '\0') {
2206                         return;
2207                 } else if(isprint(c)) {
2208                         putchar(c);
2209                 } else if(c == '\n') {
2210                         printf("(\\n)");
2211                 } else if(c == '\r') {
2212                         printf("(\\r)");
2213                 } else if(c == 0x1b) {
2214                         printf("(\\e)");
2215                 } else {
2216                         printf("(%02x)", c);
2217                 }
2218         }
2219         printf("ESC\\\n");
2220 }
2221
2222 void
2223 strreset(void) {
2224         memset(&strescseq, 0, sizeof(strescseq));
2225 }
2226
2227 void
2228 tprinter(char *s, size_t len) {
2229         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2230                 fprintf(stderr, "Error writing in %s:%s\n",
2231                         opt_io, strerror(errno));
2232                 close(iofd);
2233                 iofd = -1;
2234         }
2235 }
2236
2237 void
2238 toggleprinter(const Arg *arg) {
2239         term.mode ^= MODE_PRINT;
2240 }
2241
2242 void
2243 printscreen(const Arg *arg) {
2244         tdump();
2245 }
2246
2247 void
2248 printsel(const Arg *arg) {
2249         tdumpsel();
2250 }
2251
2252 void
2253 tdumpsel(void) {
2254         char *ptr;
2255
2256         if((ptr = getsel())) {
2257                 tprinter(ptr, strlen(ptr));
2258                 free(ptr);
2259         }
2260 }
2261
2262 void
2263 tdumpline(int n) {
2264         Glyph *bp, *end;
2265
2266         bp = &term.line[n][0];
2267         end = &bp[term.col-1];
2268         while(end > bp && !strcmp(" ", end->c))
2269                 --end;
2270         if(bp != end || strcmp(bp->c, " ")) {
2271                 for( ;bp <= end; ++bp)
2272                         tprinter(bp->c, strlen(bp->c));
2273         }
2274         tprinter("\n", 1);
2275 }
2276
2277 void
2278 tdump(void) {
2279         int i;
2280
2281         for(i = 0; i < term.row; ++i)
2282                 tdumpline(i);
2283 }
2284
2285 void
2286 tputtab(bool forward) {
2287         uint x = term.c.x;
2288
2289         if(forward) {
2290                 if(x == term.col)
2291                         return;
2292                 for(++x; x < term.col && !term.tabs[x]; ++x)
2293                         /* nothing */ ;
2294         } else {
2295                 if(x == 0)
2296                         return;
2297                 for(--x; x > 0 && !term.tabs[x]; --x)
2298                         /* nothing */ ;
2299         }
2300         tmoveto(x, term.c.y);
2301 }
2302
2303 void
2304 techo(char *buf, int len) {
2305         for(; len > 0; buf++, len--) {
2306                 char c = *buf;
2307
2308                 if(c < 0x20 || c == 0177) { /* control code */
2309                         if(c != '\n' && c != '\r' && c != '\t') {
2310                                 c ^= '\x40';
2311                                 tputc("^", 1);
2312                         }
2313                         tputc(&c, 1);
2314                 } else {
2315                         break;
2316                 }
2317         }
2318         if(len)
2319                 tputc(buf, len);
2320 }
2321
2322 void
2323 tdeftran(char ascii) {
2324         char c, (*bp)[2];
2325         static char tbl[][2] = {
2326                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2327                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2328                 {'5', CS_FIN},      {'C', CS_FIN},
2329                 {0, 0}
2330         };
2331
2332         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2333                 /* nothing */;
2334
2335         if (c == 0)
2336                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2337         else
2338                 term.trantbl[term.icharset] = (*bp)[1];
2339 }
2340
2341 void
2342 tselcs(void) {
2343         MODBIT(term.c.attr.mode,
2344                term.trantbl[term.charset] == CS_GRAPHIC0,
2345                ATTR_GFX);
2346 }
2347
2348 void
2349 tputc(char *c, int len) {
2350         uchar ascii = *c;
2351         bool control = ascii < '\x20' || ascii == 0177;
2352         long unicodep;
2353         int width;
2354
2355         if(len == 1) {
2356                 width = 1;
2357         } else {
2358                 utf8decode(c, &unicodep, UTF_SIZ);
2359                 width = wcwidth(unicodep);
2360         }
2361
2362         if(IS_SET(MODE_PRINT))
2363                 tprinter(c, len);
2364
2365         /*
2366          * STR sequences must be checked before anything else
2367          * because it can use some control codes as part of the sequence.
2368          */
2369         if(term.esc & ESC_STR) {
2370                 switch(ascii) {
2371                 case '\033':
2372                         term.esc = ESC_START | ESC_STR_END;
2373                         break;
2374                 case '\a': /* backwards compatibility to xterm */
2375                         term.esc = 0;
2376                         strhandle();
2377                         break;
2378                 default:
2379                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2380                                 memmove(&strescseq.buf[strescseq.len], c, len);
2381                                 strescseq.len += len;
2382                         } else {
2383                         /*
2384                          * Here is a bug in terminals. If the user never sends
2385                          * some code to stop the str or esc command, then st
2386                          * will stop responding. But this is better than
2387                          * silently failing with unknown characters. At least
2388                          * then users will report back.
2389                          *
2390                          * In the case users ever get fixed, here is the code:
2391                          */
2392                         /*
2393                          * term.esc = 0;
2394                          * strhandle();
2395                          */
2396                         }
2397                 }
2398                 return;
2399         }
2400
2401         /*
2402          * Actions of control codes must be performed as soon they arrive
2403          * because they can be embedded inside a control sequence, and
2404          * they must not cause conflicts with sequences.
2405          */
2406         if(control) {
2407                 switch(ascii) {
2408                 case '\t':   /* HT */
2409                         tputtab(1);
2410                         return;
2411                 case '\b':   /* BS */
2412                         tmoveto(term.c.x-1, term.c.y);
2413                         return;
2414                 case '\r':   /* CR */
2415                         tmoveto(0, term.c.y);
2416                         return;
2417                 case '\f':   /* LF */
2418                 case '\v':   /* VT */
2419                 case '\n':   /* LF */
2420                         /* go to first col if the mode is set */
2421                         tnewline(IS_SET(MODE_CRLF));
2422                         return;
2423                 case '\a':   /* BEL */
2424                         if(!(xw.state & WIN_FOCUSED))
2425                                 xseturgency(1);
2426                         if (bellvolume)
2427                                 XBell(xw.dpy, bellvolume);
2428                         return;
2429                 case '\033': /* ESC */
2430                         csireset();
2431                         term.esc = ESC_START;
2432                         return;
2433                 case '\016': /* SO */
2434                         term.charset = 0;
2435                         tselcs();
2436                         return;
2437                 case '\017': /* SI */
2438                         term.charset = 1;
2439                         tselcs();
2440                         return;
2441                 case '\032': /* SUB */
2442                 case '\030': /* CAN */
2443                         csireset();
2444                         return;
2445                 case '\005': /* ENQ (IGNORED) */
2446                 case '\000': /* NUL (IGNORED) */
2447                 case '\021': /* XON (IGNORED) */
2448                 case '\023': /* XOFF (IGNORED) */
2449                 case 0177:   /* DEL (IGNORED) */
2450                         return;
2451                 }
2452         } else if(term.esc & ESC_START) {
2453                 if(term.esc & ESC_CSI) {
2454                         csiescseq.buf[csiescseq.len++] = ascii;
2455                         if(BETWEEN(ascii, 0x40, 0x7E)
2456                                         || csiescseq.len >= \
2457                                         sizeof(csiescseq.buf)-1) {
2458                                 term.esc = 0;
2459                                 csiparse();
2460                                 csihandle();
2461                         }
2462                 } else if(term.esc & ESC_STR_END) {
2463                         term.esc = 0;
2464                         if(ascii == '\\')
2465                                 strhandle();
2466                 } else if(term.esc & ESC_ALTCHARSET) {
2467                         tdeftran(ascii);
2468                         tselcs();
2469                         term.esc = 0;
2470                 } else if(term.esc & ESC_TEST) {
2471                         if(ascii == '8') { /* DEC screen alignment test. */
2472                                 char E[UTF_SIZ] = "E";
2473                                 int x, y;
2474
2475                                 for(x = 0; x < term.col; ++x) {
2476                                         for(y = 0; y < term.row; ++y)
2477                                                 tsetchar(E, &term.c.attr, x, y);
2478                                 }
2479                         }
2480                         term.esc = 0;
2481                 } else {
2482                         switch(ascii) {
2483                         case '[':
2484                                 term.esc |= ESC_CSI;
2485                                 break;
2486                         case '#':
2487                                 term.esc |= ESC_TEST;
2488                                 break;
2489                         case 'P': /* DCS -- Device Control String */
2490                         case '_': /* APC -- Application Program Command */
2491                         case '^': /* PM -- Privacy Message */
2492                         case ']': /* OSC -- Operating System Command */
2493                         case 'k': /* old title set compatibility */
2494                                 strreset();
2495                                 strescseq.type = ascii;
2496                                 term.esc |= ESC_STR;
2497                                 break;
2498                         case '(': /* set primary charset G0 */
2499                         case ')': /* set secondary charset G1 */
2500                         case '*': /* set tertiary charset G2 */
2501                         case '+': /* set quaternary charset G3 */
2502                                 term.icharset = ascii - '(';
2503                                 term.esc |= ESC_ALTCHARSET;
2504                                 break;
2505                         case 'D': /* IND -- Linefeed */
2506                                 if(term.c.y == term.bot) {
2507                                         tscrollup(term.top, 1);
2508                                 } else {
2509                                         tmoveto(term.c.x, term.c.y+1);
2510                                 }
2511                                 term.esc = 0;
2512                                 break;
2513                         case 'E': /* NEL -- Next line */
2514                                 tnewline(1); /* always go to first col */
2515                                 term.esc = 0;
2516                                 break;
2517                         case 'H': /* HTS -- Horizontal tab stop */
2518                                 term.tabs[term.c.x] = 1;
2519                                 term.esc = 0;
2520                                 break;
2521                         case 'M': /* RI -- Reverse index */
2522                                 if(term.c.y == term.top) {
2523                                         tscrolldown(term.top, 1);
2524                                 } else {
2525                                         tmoveto(term.c.x, term.c.y-1);
2526                                 }
2527                                 term.esc = 0;
2528                                 break;
2529                         case 'Z': /* DECID -- Identify Terminal */
2530                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2531                                 term.esc = 0;
2532                                 break;
2533                         case 'c': /* RIS -- Reset to inital state */
2534                                 treset();
2535                                 term.esc = 0;
2536                                 xresettitle();
2537                                 xloadcols();
2538                                 break;
2539                         case '=': /* DECPAM -- Application keypad */
2540                                 term.mode |= MODE_APPKEYPAD;
2541                                 term.esc = 0;
2542                                 break;
2543                         case '>': /* DECPNM -- Normal keypad */
2544                                 term.mode &= ~MODE_APPKEYPAD;
2545                                 term.esc = 0;
2546                                 break;
2547                         case '7': /* DECSC -- Save Cursor */
2548                                 tcursor(CURSOR_SAVE);
2549                                 term.esc = 0;
2550                                 break;
2551                         case '8': /* DECRC -- Restore Cursor */
2552                                 tcursor(CURSOR_LOAD);
2553                                 term.esc = 0;
2554                                 break;
2555                         case '\\': /* ST -- Stop */
2556                                 term.esc = 0;
2557                                 break;
2558                         default:
2559                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2560                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2561                                 term.esc = 0;
2562                         }
2563                 }
2564                 /*
2565                  * All characters which form part of a sequence are not
2566                  * printed
2567                  */
2568                 return;
2569         }
2570         /*
2571          * Display control codes only if we are in graphic mode
2572          */
2573         if(control && !(term.c.attr.mode & ATTR_GFX))
2574                 return;
2575         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2576                 selclear(NULL);
2577         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2578                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2579                 tnewline(1);
2580         }
2581
2582         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2583                 memmove(&term.line[term.c.y][term.c.x+1],
2584                         &term.line[term.c.y][term.c.x],
2585                         (term.col - term.c.x - 1) * sizeof(Glyph));
2586         }
2587
2588         if(term.c.x+width > term.col)
2589                 tnewline(1);
2590
2591         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2592
2593         if(width == 2) {
2594                 term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
2595                 if(term.c.x+1 < term.col) {
2596                         term.line[term.c.y][term.c.x+1].c[0] = '\0';
2597                         term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
2598                 }
2599         }
2600         if(term.c.x+width < term.col) {
2601                 tmoveto(term.c.x+width, term.c.y);
2602         } else {
2603                 term.c.state |= CURSOR_WRAPNEXT;
2604         }
2605 }
2606
2607 int
2608 tresize(int col, int row) {
2609         int i;
2610         int minrow = MIN(row, term.row);
2611         int mincol = MIN(col, term.col);
2612         int slide = term.c.y - row + 1;
2613         bool *bp;
2614         Line *orig;
2615
2616         if(col < 1 || row < 1)
2617                 return 0;
2618
2619         /* free unneeded rows */
2620         i = 0;
2621         if(slide > 0) {
2622                 /*
2623                  * slide screen to keep cursor where we expect it -
2624                  * tscrollup would work here, but we can optimize to
2625                  * memmove because we're freeing the earlier lines
2626                  */
2627                 for(/* i = 0 */; i < slide; i++) {
2628                         free(term.line[i]);
2629                         free(term.alt[i]);
2630                 }
2631                 memmove(term.line, term.line + slide, row * sizeof(Line));
2632                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2633         }
2634         for(i += row; i < term.row; i++) {
2635                 free(term.line[i]);
2636                 free(term.alt[i]);
2637         }
2638
2639         /* resize to new height */
2640         term.line = xrealloc(term.line, row * sizeof(Line));
2641         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2642         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2643         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2644
2645         /* resize each row to new width, zero-pad if needed */
2646         for(i = 0; i < minrow; i++) {
2647                 term.dirty[i] = 1;
2648                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2649                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2650         }
2651
2652         /* allocate any new rows */
2653         for(/* i == minrow */; i < row; i++) {
2654                 term.dirty[i] = 1;
2655                 term.line[i] = xmalloc(col * sizeof(Glyph));
2656                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2657         }
2658         if(col > term.col) {
2659                 bp = term.tabs + term.col;
2660
2661                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2662                 while(--bp > term.tabs && !*bp)
2663                         /* nothing */ ;
2664                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2665                         *bp = 1;
2666         }
2667         /* update terminal size */
2668         term.col = col;
2669         term.row = row;
2670         /* reset scrolling region */
2671         tsetscroll(0, row-1);
2672         /* make use of the LIMIT in tmoveto */
2673         tmoveto(term.c.x, term.c.y);
2674         /* Clearing both screens */
2675         orig = term.line;
2676         do {
2677                 if(mincol < col && 0 < minrow) {
2678                         tclearregion(mincol, 0, col - 1, minrow - 1);
2679                 }
2680                 if(0 < col && minrow < row) {
2681                         tclearregion(0, minrow, col - 1, row - 1);
2682                 }
2683                 tswapscreen();
2684         } while(orig != term.line);
2685
2686         return (slide > 0);
2687 }
2688
2689 void
2690 xresize(int col, int row) {
2691         xw.tw = MAX(1, col * xw.cw);
2692         xw.th = MAX(1, row * xw.ch);
2693
2694         XFreePixmap(xw.dpy, xw.buf);
2695         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2696                         DefaultDepth(xw.dpy, xw.scr));
2697         XftDrawChange(xw.draw, xw.buf);
2698         xclear(0, 0, xw.w, xw.h);
2699 }
2700
2701 static inline ushort
2702 sixd_to_16bit(int x) {
2703         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2704 }
2705
2706 void
2707 xloadcols(void) {
2708         int i, r, g, b;
2709         XRenderColor color = { .alpha = 0xffff };
2710         static bool loaded;
2711         Colour *cp;
2712
2713         if(loaded) {
2714                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2715                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2716         }
2717
2718         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2719         for(i = 0; i < LEN(colorname); i++) {
2720                 if(!colorname[i])
2721                         continue;
2722                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2723                         die("Could not allocate color '%s'\n", colorname[i]);
2724                 }
2725         }
2726
2727         /* load colors [16-255] ; same colors as xterm */
2728         for(i = 16, r = 0; r < 6; r++) {
2729                 for(g = 0; g < 6; g++) {
2730                         for(b = 0; b < 6; b++) {
2731                                 color.red = sixd_to_16bit(r);
2732                                 color.green = sixd_to_16bit(g);
2733                                 color.blue = sixd_to_16bit(b);
2734                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2735                                         die("Could not allocate color %d\n", i);
2736                                 }
2737                                 i++;
2738                         }
2739                 }
2740         }
2741
2742         for(r = 0; r < 24; r++, i++) {
2743                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2744                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2745                                         &dc.col[i])) {
2746                         die("Could not allocate color %d\n", i);
2747                 }
2748         }
2749         loaded = true;
2750 }
2751
2752 int
2753 xsetcolorname(int x, const char *name) {
2754         XRenderColor color = { .alpha = 0xffff };
2755         Colour colour;
2756         if (x < 0 || x > LEN(colorname))
2757                 return -1;
2758         if(!name) {
2759                 if(16 <= x && x < 16 + 216) {
2760                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2761                         color.red = sixd_to_16bit(r);
2762                         color.green = sixd_to_16bit(g);
2763                         color.blue = sixd_to_16bit(b);
2764                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2765                                 return 0; /* something went wrong */
2766                         dc.col[x] = colour;
2767                         return 1;
2768                 } else if (16 + 216 <= x && x < 256) {
2769                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2770                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2771                                 return 0; /* something went wrong */
2772                         dc.col[x] = colour;
2773                         return 1;
2774                 } else {
2775                         name = colorname[x];
2776                 }
2777         }
2778         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2779                 return 0;
2780         dc.col[x] = colour;
2781         return 1;
2782 }
2783
2784 void
2785 xtermclear(int col1, int row1, int col2, int row2) {
2786         XftDrawRect(xw.draw,
2787                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2788                         borderpx + col1 * xw.cw,
2789                         borderpx + row1 * xw.ch,
2790                         (col2-col1+1) * xw.cw,
2791                         (row2-row1+1) * xw.ch);
2792 }
2793
2794 /*
2795  * Absolute coordinates.
2796  */
2797 void
2798 xclear(int x1, int y1, int x2, int y2) {
2799         XftDrawRect(xw.draw,
2800                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2801                         x1, y1, x2-x1, y2-y1);
2802 }
2803
2804 void
2805 xhints(void) {
2806         XClassHint class = {opt_class ? opt_class : termname, termname};
2807         XWMHints wm = {.flags = InputHint, .input = 1};
2808         XSizeHints *sizeh = NULL;
2809
2810         sizeh = XAllocSizeHints();
2811         if(xw.isfixed == False) {
2812                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2813                 sizeh->height = xw.h;
2814                 sizeh->width = xw.w;
2815                 sizeh->height_inc = xw.ch;
2816                 sizeh->width_inc = xw.cw;
2817                 sizeh->base_height = 2 * borderpx;
2818                 sizeh->base_width = 2 * borderpx;
2819         } else {
2820                 sizeh->flags = PMaxSize | PMinSize;
2821                 sizeh->min_width = sizeh->max_width = xw.fw;
2822                 sizeh->min_height = sizeh->max_height = xw.fh;
2823         }
2824
2825         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2826                         &class);
2827         XFree(sizeh);
2828 }
2829
2830 int
2831 xloadfont(Font *f, FcPattern *pattern) {
2832         FcPattern *match;
2833         FcResult result;
2834
2835         match = FcFontMatch(NULL, pattern, &result);
2836         if(!match)
2837                 return 1;
2838
2839         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2840                 FcPatternDestroy(match);
2841                 return 1;
2842         }
2843
2844         f->set = NULL;
2845         f->pattern = FcPatternDuplicate(pattern);
2846
2847         f->ascent = f->match->ascent;
2848         f->descent = f->match->descent;
2849         f->lbearing = 0;
2850         f->rbearing = f->match->max_advance_width;
2851
2852         f->height = f->ascent + f->descent;
2853         f->width = f->lbearing + f->rbearing;
2854
2855         return 0;
2856 }
2857
2858 void
2859 xloadfonts(char *fontstr, double fontsize) {
2860         FcPattern *pattern;
2861         FcResult r_sz, r_psz;
2862         double fontval;
2863
2864         if(fontstr[0] == '-') {
2865                 pattern = XftXlfdParse(fontstr, False, False);
2866         } else {
2867                 pattern = FcNameParse((FcChar8 *)fontstr);
2868         }
2869
2870         if(!pattern)
2871                 die("st: can't open font %s\n", fontstr);
2872
2873         if(fontsize > 0) {
2874                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2875                 FcPatternDel(pattern, FC_SIZE);
2876                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2877                 usedfontsize = fontsize;
2878         } else {
2879                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2880                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2881                 if(r_psz == FcResultMatch) {
2882                         usedfontsize = fontval;
2883                 } else if(r_sz == FcResultMatch) {
2884                         usedfontsize = -1;
2885                 } else {
2886                         /*
2887                          * Default font size is 12, if none given. This is to
2888                          * have a known usedfontsize value.
2889                          */
2890                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2891                         usedfontsize = 12;
2892                 }
2893         }
2894
2895         FcConfigSubstitute(0, pattern, FcMatchPattern);
2896         FcDefaultSubstitute(pattern);
2897
2898         if(xloadfont(&dc.font, pattern))
2899                 die("st: can't open font %s\n", fontstr);
2900
2901         if(usedfontsize < 0) {
2902                 FcPatternGetDouble(dc.font.match->pattern,
2903                                    FC_PIXEL_SIZE, 0, &fontval);
2904                 usedfontsize = fontval;
2905         }
2906
2907         /* Setting character width and height. */
2908         xw.cw = CEIL(dc.font.width * cwscale);
2909         xw.ch = CEIL(dc.font.height * chscale);
2910
2911         FcPatternDel(pattern, FC_SLANT);
2912         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2913         if(xloadfont(&dc.ifont, pattern))
2914                 die("st: can't open font %s\n", fontstr);
2915
2916         FcPatternDel(pattern, FC_WEIGHT);
2917         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2918         if(xloadfont(&dc.ibfont, pattern))
2919                 die("st: can't open font %s\n", fontstr);
2920
2921         FcPatternDel(pattern, FC_SLANT);
2922         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2923         if(xloadfont(&dc.bfont, pattern))
2924                 die("st: can't open font %s\n", fontstr);
2925
2926         FcPatternDestroy(pattern);
2927 }
2928
2929 int
2930 xloadfontset(Font *f) {
2931         FcResult result;
2932
2933         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2934                 return 1;
2935         return 0;
2936 }
2937
2938 void
2939 xunloadfont(Font *f) {
2940         XftFontClose(xw.dpy, f->match);
2941         FcPatternDestroy(f->pattern);
2942         if(f->set)
2943                 FcFontSetDestroy(f->set);
2944 }
2945
2946 void
2947 xunloadfonts(void) {
2948         int i;
2949
2950         /* Free the loaded fonts in the font cache.  */
2951         for(i = 0; i < frclen; i++) {
2952                 XftFontClose(xw.dpy, frc[i].font);
2953         }
2954         frclen = 0;
2955
2956         xunloadfont(&dc.font);
2957         xunloadfont(&dc.bfont);
2958         xunloadfont(&dc.ifont);
2959         xunloadfont(&dc.ibfont);
2960 }
2961
2962 void
2963 xzoom(const Arg *arg) {
2964         xunloadfonts();
2965         xloadfonts(usedfont, usedfontsize + arg->i);
2966         cresize(0, 0);
2967         redraw(0);
2968 }
2969
2970 void
2971 xinit(void) {
2972         XGCValues gcvalues;
2973         Cursor cursor;
2974         Window parent;
2975         int sw, sh;
2976         pid_t thispid = getpid();
2977
2978         if(!(xw.dpy = XOpenDisplay(NULL)))
2979                 die("Can't open display\n");
2980         xw.scr = XDefaultScreen(xw.dpy);
2981         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2982
2983         /* font */
2984         if(!FcInit())
2985                 die("Could not init fontconfig.\n");
2986
2987         usedfont = (opt_font == NULL)? font : opt_font;
2988         xloadfonts(usedfont, 0);
2989
2990         /* colors */
2991         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2992         xloadcols();
2993
2994         /* adjust fixed window geometry */
2995         if(xw.isfixed) {
2996                 sw = DisplayWidth(xw.dpy, xw.scr);
2997                 sh = DisplayHeight(xw.dpy, xw.scr);
2998                 if(xw.fx < 0)
2999                         xw.fx = sw + xw.fx - xw.fw - 1;
3000                 if(xw.fy < 0)
3001                         xw.fy = sh + xw.fy - xw.fh - 1;
3002
3003                 xw.h = xw.fh;
3004                 xw.w = xw.fw;
3005         } else {
3006                 /* window - default size */
3007                 xw.h = 2 * borderpx + term.row * xw.ch;
3008                 xw.w = 2 * borderpx + term.col * xw.cw;
3009                 xw.fx = 0;
3010                 xw.fy = 0;
3011         }
3012
3013         /* Events */
3014         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3015         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3016         xw.attrs.bit_gravity = NorthWestGravity;
3017         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3018                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3019                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3020         xw.attrs.colormap = xw.cmap;
3021
3022         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3023                         XRootWindow(xw.dpy, xw.scr);
3024         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
3025                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3026                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3027                         | CWEventMask | CWColormap, &xw.attrs);
3028
3029         memset(&gcvalues, 0, sizeof(gcvalues));
3030         gcvalues.graphics_exposures = False;
3031         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3032                         &gcvalues);
3033         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3034                         DefaultDepth(xw.dpy, xw.scr));
3035         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3036         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3037
3038         /* Xft rendering context */
3039         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3040
3041         /* input methods */
3042         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3043                 XSetLocaleModifiers("@im=local");
3044                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3045                         XSetLocaleModifiers("@im=");
3046                         if((xw.xim = XOpenIM(xw.dpy,
3047                                         NULL, NULL, NULL)) == NULL) {
3048                                 die("XOpenIM failed. Could not open input"
3049                                         " device.\n");
3050                         }
3051                 }
3052         }
3053         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3054                                            | XIMStatusNothing, XNClientWindow, xw.win,
3055                                            XNFocusWindow, xw.win, NULL);
3056         if(xw.xic == NULL)
3057                 die("XCreateIC failed. Could not obtain input method.\n");
3058
3059         /* white cursor, black outline */
3060         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3061         XDefineCursor(xw.dpy, xw.win, cursor);
3062         XRecolorCursor(xw.dpy, cursor,
3063                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3064                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3065
3066         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3067         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3068         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3069         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3070
3071         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3072         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3073                         PropModeReplace, (uchar *)&thispid, 1);
3074
3075         xresettitle();
3076         XMapWindow(xw.dpy, xw.win);
3077         xhints();
3078         XSync(xw.dpy, False);
3079 }
3080
3081 void
3082 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3083         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3084             width = charlen * xw.cw, xp, i;
3085         int frcflags;
3086         int u8fl, u8fblen, u8cblen, doesexist;
3087         char *u8c, *u8fs;
3088         long unicodep;
3089         Font *font = &dc.font;
3090         FcResult fcres;
3091         FcPattern *fcpattern, *fontpattern;
3092         FcFontSet *fcsets[] = { NULL };
3093         FcCharSet *fccharset;
3094         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3095         XRenderColor colfg, colbg;
3096         XRectangle r;
3097         int oneatatime;
3098
3099         frcflags = FRC_NORMAL;
3100
3101         if(base.mode & ATTR_ITALIC) {
3102                 if(base.fg == defaultfg)
3103                         base.fg = defaultitalic;
3104                 font = &dc.ifont;
3105                 frcflags = FRC_ITALIC;
3106         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3107                 if(base.fg == defaultfg)
3108                         base.fg = defaultitalic;
3109                 font = &dc.ibfont;
3110                 frcflags = FRC_ITALICBOLD;
3111         } else if(base.mode & ATTR_UNDERLINE) {
3112                 if(base.fg == defaultfg)
3113                         base.fg = defaultunderline;
3114         }
3115
3116         if(IS_TRUECOL(base.fg)) {
3117                 colfg.alpha = 0xffff;
3118                 colfg.red = TRUERED(base.fg);
3119                 colfg.green = TRUEGREEN(base.fg);
3120                 colfg.blue = TRUEBLUE(base.fg);
3121                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3122                 fg = &truefg;
3123         } else {
3124                 fg = &dc.col[base.fg];
3125         }
3126
3127         if(IS_TRUECOL(base.bg)) {
3128                 colbg.alpha = 0xffff;
3129                 colbg.green = TRUEGREEN(base.bg);
3130                 colbg.red = TRUERED(base.bg);
3131                 colbg.blue = TRUEBLUE(base.bg);
3132                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3133                 bg = &truebg;
3134         } else {
3135                 bg = &dc.col[base.bg];
3136         }
3137
3138         if(base.mode & ATTR_BOLD) {
3139                 if(BETWEEN(base.fg, 0, 7)) {
3140                         /* basic system colors */
3141                         fg = &dc.col[base.fg + 8];
3142                 } else if(BETWEEN(base.fg, 16, 195)) {
3143                         /* 256 colors */
3144                         fg = &dc.col[base.fg + 36];
3145                 } else if(BETWEEN(base.fg, 232, 251)) {
3146                         /* greyscale */
3147                         fg = &dc.col[base.fg + 4];
3148                 }
3149                 /*
3150                  * Those ranges will not be brightened:
3151                  *    8 - 15 – bright system colors
3152                  *    196 - 231 – highest 256 color cube
3153                  *    252 - 255 – brightest colors in greyscale
3154                  */
3155                 font = &dc.bfont;
3156                 frcflags = FRC_BOLD;
3157         }
3158
3159         if(IS_SET(MODE_REVERSE)) {
3160                 if(fg == &dc.col[defaultfg]) {
3161                         fg = &dc.col[defaultbg];
3162                 } else {
3163                         colfg.red = ~fg->color.red;
3164                         colfg.green = ~fg->color.green;
3165                         colfg.blue = ~fg->color.blue;
3166                         colfg.alpha = fg->color.alpha;
3167                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3168                                         &revfg);
3169                         fg = &revfg;
3170                 }
3171
3172                 if(bg == &dc.col[defaultbg]) {
3173                         bg = &dc.col[defaultfg];
3174                 } else {
3175                         colbg.red = ~bg->color.red;
3176                         colbg.green = ~bg->color.green;
3177                         colbg.blue = ~bg->color.blue;
3178                         colbg.alpha = bg->color.alpha;
3179                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3180                                         &revbg);
3181                         bg = &revbg;
3182                 }
3183         }
3184
3185         if(base.mode & ATTR_REVERSE) {
3186                 temp = fg;
3187                 fg = bg;
3188                 bg = temp;
3189         }
3190
3191         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3192                 fg = bg;
3193
3194         /* Intelligent cleaning up of the borders. */
3195         if(x == 0) {
3196                 xclear(0, (y == 0)? 0 : winy, borderpx,
3197                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3198         }
3199         if(x + charlen >= term.col) {
3200                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3201                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3202         }
3203         if(y == 0)
3204                 xclear(winx, 0, winx + width, borderpx);
3205         if(y == term.row-1)
3206                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3207
3208         /* Clean up the region we want to draw to. */
3209         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3210
3211         /* Set the clip region because Xft is sometimes dirty. */
3212         r.x = 0;
3213         r.y = 0;
3214         r.height = xw.ch;
3215         r.width = width;
3216         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3217
3218         for(xp = winx; bytelen > 0;) {
3219                 /*
3220                  * Search for the range in the to be printed string of glyphs
3221                  * that are in the main font. Then print that range. If
3222                  * some glyph is found that is not in the font, do the
3223                  * fallback dance.
3224                  */
3225                 u8fs = s;
3226                 u8fblen = 0;
3227                 u8fl = 0;
3228                 oneatatime = font->width != xw.cw;
3229                 for(;;) {
3230                         u8c = s;
3231                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3232                         s += u8cblen;
3233                         bytelen -= u8cblen;
3234
3235                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3236                         if(oneatatime || !doesexist || bytelen <= 0) {
3237                                 if(oneatatime || bytelen <= 0) {
3238                                         if(doesexist) {
3239                                                 u8fl++;
3240                                                 u8fblen += u8cblen;
3241                                         }
3242                                 }
3243
3244                                 if(u8fl > 0) {
3245                                         XftDrawStringUtf8(xw.draw, fg,
3246                                                         font->match, xp,
3247                                                         winy + font->ascent,
3248                                                         (FcChar8 *)u8fs,
3249                                                         u8fblen);
3250                                         xp += xw.cw * u8fl;
3251
3252                                 }
3253                                 break;
3254                         }
3255
3256                         u8fl++;
3257                         u8fblen += u8cblen;
3258                 }
3259                 if(doesexist) {
3260                         if(oneatatime)
3261                                 continue;
3262                         break;
3263                 }
3264
3265                 /* Search the font cache. */
3266                 for(i = 0; i < frclen; i++) {
3267                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3268                                         && frc[i].flags == frcflags) {
3269                                 break;
3270                         }
3271                 }
3272
3273                 /* Nothing was found. */
3274                 if(i >= frclen) {
3275                         if(!font->set)
3276                                 xloadfontset(font);
3277                         fcsets[0] = font->set;
3278
3279                         /*
3280                          * Nothing was found in the cache. Now use
3281                          * some dozen of Fontconfig calls to get the
3282                          * font for one single character.
3283                          *
3284                          * Xft and fontconfig are design failures.
3285                          */
3286                         fcpattern = FcPatternDuplicate(font->pattern);
3287                         fccharset = FcCharSetCreate();
3288
3289                         FcCharSetAddChar(fccharset, unicodep);
3290                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3291                                         fccharset);
3292                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3293                                         FcTrue);
3294
3295                         FcConfigSubstitute(0, fcpattern,
3296                                         FcMatchPattern);
3297                         FcDefaultSubstitute(fcpattern);
3298
3299                         fontpattern = FcFontSetMatch(0, fcsets,
3300                                         FcTrue, fcpattern, &fcres);
3301
3302                         /*
3303                          * Overwrite or create the new cache entry.
3304                          */
3305                         if(frclen >= LEN(frc)) {
3306                                 frclen = LEN(frc) - 1;
3307                                 XftFontClose(xw.dpy, frc[frclen].font);
3308                         }
3309
3310                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3311                                         fontpattern);
3312                         frc[frclen].flags = frcflags;
3313
3314                         i = frclen;
3315                         frclen++;
3316
3317                         FcPatternDestroy(fcpattern);
3318                         FcCharSetDestroy(fccharset);
3319                 }
3320
3321                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3322                                 xp, winy + frc[i].font->ascent,
3323                                 (FcChar8 *)u8c, u8cblen);
3324
3325                 xp += xw.cw * wcwidth(unicodep);
3326         }
3327
3328         /*
3329          * This is how the loop above actually should be. Why does the
3330          * application have to care about font details?
3331          *
3332          * I have to repeat: Xft and Fontconfig are design failures.
3333          */
3334         /*
3335         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3336                         winy + font->ascent, (FcChar8 *)s, bytelen);
3337         */
3338
3339         if(base.mode & ATTR_UNDERLINE) {
3340                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3341                                 width, 1);
3342         }
3343
3344         /* Reset clip to none. */
3345         XftDrawSetClip(xw.draw, 0);
3346 }
3347
3348 void
3349 xdrawcursor(void) {
3350         static int oldx = 0, oldy = 0;
3351         int sl, width, curx;
3352         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3353
3354         LIMIT(oldx, 0, term.col-1);
3355         LIMIT(oldy, 0, term.row-1);
3356
3357         curx = term.c.x;
3358
3359         /* adjust position if in dummy */
3360         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3361                 oldx--;
3362         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3363                 curx--;
3364
3365         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3366
3367         /* remove the old cursor */
3368         sl = utf8len(term.line[oldy][oldx].c);
3369         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3370         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3371                         oldy, width, sl);
3372
3373         /* draw the new one */
3374         if(!(IS_SET(MODE_HIDE))) {
3375                 if(xw.state & WIN_FOCUSED) {
3376                         if(IS_SET(MODE_REVERSE)) {
3377                                 g.mode |= ATTR_REVERSE;
3378                                 g.fg = defaultcs;
3379                                 g.bg = defaultfg;
3380                         }
3381
3382                         sl = utf8len(g.c);
3383                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3384                                 ? 2 : 1;
3385                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3386                 } else {
3387                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3388                                         borderpx + curx * xw.cw,
3389                                         borderpx + term.c.y * xw.ch,
3390                                         xw.cw - 1, 1);
3391                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3392                                         borderpx + curx * xw.cw,
3393                                         borderpx + term.c.y * xw.ch,
3394                                         1, xw.ch - 1);
3395                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3396                                         borderpx + (curx + 1) * xw.cw - 1,
3397                                         borderpx + term.c.y * xw.ch,
3398                                         1, xw.ch - 1);
3399                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3400                                         borderpx + curx * xw.cw,
3401                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3402                                         xw.cw, 1);
3403                 }
3404                 oldx = curx, oldy = term.c.y;
3405         }
3406 }
3407
3408
3409 void
3410 xsettitle(char *p) {
3411         XTextProperty prop;
3412
3413         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3414                         &prop);
3415         XSetWMName(xw.dpy, xw.win, &prop);
3416         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3417         XFree(prop.value);
3418 }
3419
3420 void
3421 xresettitle(void) {
3422         xsettitle(opt_title ? opt_title : "st");
3423 }
3424
3425 void
3426 redraw(int timeout) {
3427         struct timespec tv = {0, timeout * 1000};
3428
3429         draw();
3430
3431         if(timeout > 0) {
3432                 nanosleep(&tv, NULL);
3433                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3434         }
3435 }
3436
3437 void
3438 draw(void) {
3439         drawregion(0, 0, term.col, term.row);
3440         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3441                         xw.h, 0, 0);
3442         XSetForeground(xw.dpy, dc.gc,
3443                         dc.col[IS_SET(MODE_REVERSE)?
3444                                 defaultfg : defaultbg].pixel);
3445 }
3446
3447 void
3448 drawregion(int x1, int y1, int x2, int y2) {
3449         int ic, ib, x, y, ox, sl;
3450         Glyph base, new;
3451         char buf[DRAW_BUF_SIZ];
3452         bool ena_sel = sel.ob.x != -1;
3453         long unicodep;
3454
3455         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3456                 ena_sel = 0;
3457
3458         if(!(xw.state & WIN_VISIBLE))
3459                 return;
3460
3461         for(y = y1; y < y2; y++) {
3462                 if(!term.dirty[y])
3463                         continue;
3464
3465                 xtermclear(0, y, term.col, y);
3466                 term.dirty[y] = 0;
3467                 base = term.line[y][0];
3468                 ic = ib = ox = 0;
3469                 for(x = x1; x < x2; x++) {
3470                         new = term.line[y][x];
3471                         if(new.mode == ATTR_WDUMMY)
3472                                 continue;
3473                         if(ena_sel && selected(x, y))
3474                                 new.mode ^= ATTR_REVERSE;
3475                         if(ib > 0 && (ATTRCMP(base, new)
3476                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3477                                 xdraws(buf, base, ox, y, ic, ib);
3478                                 ic = ib = 0;
3479                         }
3480                         if(ib == 0) {
3481                                 ox = x;
3482                                 base = new;
3483                         }
3484
3485                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3486                         memcpy(buf+ib, new.c, sl);
3487                         ib += sl;
3488                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3489                 }
3490                 if(ib > 0)
3491                         xdraws(buf, base, ox, y, ic, ib);
3492         }
3493         xdrawcursor();
3494 }
3495
3496 void
3497 expose(XEvent *ev) {
3498         XExposeEvent *e = &ev->xexpose;
3499
3500         if(xw.state & WIN_REDRAW) {
3501                 if(!e->count)
3502                         xw.state &= ~WIN_REDRAW;
3503         }
3504         redraw(0);
3505 }
3506
3507 void
3508 visibility(XEvent *ev) {
3509         XVisibilityEvent *e = &ev->xvisibility;
3510
3511         if(e->state == VisibilityFullyObscured) {
3512                 xw.state &= ~WIN_VISIBLE;
3513         } else if(!(xw.state & WIN_VISIBLE)) {
3514                 /* need a full redraw for next Expose, not just a buf copy */
3515                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3516         }
3517 }
3518
3519 void
3520 unmap(XEvent *ev) {
3521         xw.state &= ~WIN_VISIBLE;
3522 }
3523
3524 void
3525 xsetpointermotion(int set) {
3526         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3527         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3528 }
3529
3530 void
3531 xseturgency(int add) {
3532         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3533
3534         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3535         XSetWMHints(xw.dpy, xw.win, h);
3536         XFree(h);
3537 }
3538
3539 void
3540 focus(XEvent *ev) {
3541         XFocusChangeEvent *e = &ev->xfocus;
3542
3543         if(e->mode == NotifyGrab)
3544                 return;
3545
3546         if(ev->type == FocusIn) {
3547                 XSetICFocus(xw.xic);
3548                 xw.state |= WIN_FOCUSED;
3549                 xseturgency(0);
3550                 if(IS_SET(MODE_FOCUS))
3551                         ttywrite("\033[I", 3);
3552         } else {
3553                 XUnsetICFocus(xw.xic);
3554                 xw.state &= ~WIN_FOCUSED;
3555                 if(IS_SET(MODE_FOCUS))
3556                         ttywrite("\033[O", 3);
3557         }
3558 }
3559
3560 static inline bool
3561 match(uint mask, uint state) {
3562         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3563 }
3564
3565 void
3566 numlock(const Arg *dummy) {
3567         term.numlock ^= 1;
3568 }
3569
3570 char*
3571 kmap(KeySym k, uint state) {
3572         Key *kp;
3573         int i;
3574
3575         /* Check for mapped keys out of X11 function keys. */
3576         for(i = 0; i < LEN(mappedkeys); i++) {
3577                 if(mappedkeys[i] == k)
3578                         break;
3579         }
3580         if(i == LEN(mappedkeys)) {
3581                 if((k & 0xFFFF) < 0xFD00)
3582                         return NULL;
3583         }
3584
3585         for(kp = key; kp < key + LEN(key); kp++) {
3586                 if(kp->k != k)
3587                         continue;
3588
3589                 if(!match(kp->mask, state))
3590                         continue;
3591
3592                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3593                         continue;
3594                 if(term.numlock && kp->appkey == 2)
3595                         continue;
3596
3597                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3598                         continue;
3599
3600                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3601                         continue;
3602
3603                 return kp->s;
3604         }
3605
3606         return NULL;
3607 }
3608
3609 void
3610 kpress(XEvent *ev) {
3611         XKeyEvent *e = &ev->xkey;
3612         KeySym ksym;
3613         char buf[32], *customkey;
3614         int len;
3615         long c;
3616         Status status;
3617         Shortcut *bp;
3618
3619         if(IS_SET(MODE_KBDLOCK))
3620                 return;
3621
3622         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3623         /* 1. shortcuts */
3624         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3625                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3626                         bp->func(&(bp->arg));
3627                         return;
3628                 }
3629         }
3630
3631         /* 2. custom keys from config.h */
3632         if((customkey = kmap(ksym, e->state))) {
3633                 ttysend(customkey, strlen(customkey));
3634                 return;
3635         }
3636
3637         /* 3. composed string from input method */
3638         if(len == 0)
3639                 return;
3640         if(len == 1 && e->state & Mod1Mask) {
3641                 if(IS_SET(MODE_8BIT)) {
3642                         if(*buf < 0177) {
3643                                 c = *buf | 0x80;
3644                                 len = utf8encode(c, buf, UTF_SIZ);
3645                         }
3646                 } else {
3647                         buf[1] = buf[0];
3648                         buf[0] = '\033';
3649                         len = 2;
3650                 }
3651         }
3652         ttysend(buf, len);
3653 }
3654
3655
3656 void
3657 cmessage(XEvent *e) {
3658         /*
3659          * See xembed specs
3660          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3661          */
3662         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3663                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3664                         xw.state |= WIN_FOCUSED;
3665                         xseturgency(0);
3666                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3667                         xw.state &= ~WIN_FOCUSED;
3668                 }
3669         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3670                 /* Send SIGHUP to shell */
3671                 kill(pid, SIGHUP);
3672                 exit(EXIT_SUCCESS);
3673         }
3674 }
3675
3676 void
3677 cresize(int width, int height) {
3678         int col, row;
3679
3680         if(width != 0)
3681                 xw.w = width;
3682         if(height != 0)
3683                 xw.h = height;
3684
3685         col = (xw.w - 2 * borderpx) / xw.cw;
3686         row = (xw.h - 2 * borderpx) / xw.ch;
3687
3688         tresize(col, row);
3689         xresize(col, row);
3690         ttyresize();
3691 }
3692
3693 void
3694 resize(XEvent *e) {
3695         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3696                 return;
3697
3698         cresize(e->xconfigure.width, e->xconfigure.height);
3699 }
3700
3701 void
3702 run(void) {
3703         XEvent ev;
3704         int w = xw.w, h = xw.h;
3705         fd_set rfd;
3706         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3707         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3708
3709         /* Waiting for window mapping */
3710         while(1) {
3711                 XNextEvent(xw.dpy, &ev);
3712                 if(ev.type == ConfigureNotify) {
3713                         w = ev.xconfigure.width;
3714                         h = ev.xconfigure.height;
3715                 } else if(ev.type == MapNotify) {
3716                         break;
3717                 }
3718         }
3719
3720         ttynew();
3721         if(!xw.isfixed)
3722                 cresize(w, h);
3723         else
3724                 cresize(xw.fw, xw.fh);
3725
3726         gettimeofday(&last, NULL);
3727         lastblink = last;
3728
3729         for(xev = actionfps;;) {
3730                 long deltatime;
3731
3732                 FD_ZERO(&rfd);
3733                 FD_SET(cmdfd, &rfd);
3734                 FD_SET(xfd, &rfd);
3735
3736                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3737                         if(errno == EINTR)
3738                                 continue;
3739                         die("select failed: %s\n", strerror(errno));
3740                 }
3741                 if(FD_ISSET(cmdfd, &rfd)) {
3742                         ttyread();
3743                         if(blinktimeout) {
3744                                 blinkset = tattrset(ATTR_BLINK);
3745                                 if(!blinkset)
3746                                         MODBIT(term.mode, 0, MODE_BLINK);
3747                         }
3748                 }
3749
3750                 if(FD_ISSET(xfd, &rfd))
3751                         xev = actionfps;
3752
3753                 gettimeofday(&now, NULL);
3754                 drawtimeout.tv_sec = 0;
3755                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3756                 tv = &drawtimeout;
3757
3758                 dodraw = 0;
3759                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3760                         tsetdirtattr(ATTR_BLINK);
3761                         term.mode ^= MODE_BLINK;
3762                         lastblink = now;
3763                         dodraw = 1;
3764                 }
3765                 deltatime = TIMEDIFF(now, last);
3766                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3767                                 || deltatime < 0) {
3768                         dodraw = 1;
3769                         last = now;
3770                 }
3771
3772                 if(dodraw) {
3773                         while(XPending(xw.dpy)) {
3774                                 XNextEvent(xw.dpy, &ev);
3775                                 if(XFilterEvent(&ev, None))
3776                                         continue;
3777                                 if(handler[ev.type])
3778                                         (handler[ev.type])(&ev);
3779                         }
3780
3781                         draw();
3782                         XFlush(xw.dpy);
3783
3784                         if(xev && !FD_ISSET(xfd, &rfd))
3785                                 xev--;
3786                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3787                                 if(blinkset) {
3788                                         if(TIMEDIFF(now, lastblink) \
3789                                                         > blinktimeout) {
3790                                                 drawtimeout.tv_usec = 1;
3791                                         } else {
3792                                                 drawtimeout.tv_usec = (1000 * \
3793                                                         (blinktimeout - \
3794                                                         TIMEDIFF(now,
3795                                                                 lastblink)));
3796                                         }
3797                                 } else {
3798                                         tv = NULL;
3799                                 }
3800                         }
3801                 }
3802         }
3803 }
3804
3805 void
3806 usage(void) {
3807         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3808         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3809         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3810 }
3811
3812 int
3813 main(int argc, char *argv[]) {
3814         int bitm, xr, yr;
3815         uint wr, hr;
3816         char *titles;
3817
3818         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3819         xw.isfixed = False;
3820
3821         ARGBEGIN {
3822         case 'a':
3823                 allowaltscreen = false;
3824                 break;
3825         case 'c':
3826                 opt_class = EARGF(usage());
3827                 break;
3828         case 'e':
3829                 /* eat all remaining arguments */
3830                 if(argc > 1) {
3831                         opt_cmd = &argv[1];
3832                         if(argv[1] != NULL && opt_title == NULL) {
3833                                 titles = xstrdup(argv[1]);
3834                                 opt_title = basename(titles);
3835                         }
3836                 }
3837                 goto run;
3838         case 'f':
3839                 opt_font = EARGF(usage());
3840                 break;
3841         case 'g':
3842                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3843                 if(bitm & XValue)
3844                         xw.fx = xr;
3845                 if(bitm & YValue)
3846                         xw.fy = yr;
3847                 if(bitm & WidthValue)
3848                         xw.fw = (int)wr;
3849                 if(bitm & HeightValue)
3850                         xw.fh = (int)hr;
3851                 if(bitm & XNegative && xw.fx == 0)
3852                         xw.fx = -1;
3853                 if(bitm & YNegative && xw.fy == 0)
3854                         xw.fy = -1;
3855
3856                 if(xw.fh != 0 && xw.fw != 0)
3857                         xw.isfixed = True;
3858                 break;
3859         case 'o':
3860                 opt_io = EARGF(usage());
3861                 break;
3862         case 't':
3863                 opt_title = EARGF(usage());
3864                 break;
3865         case 'w':
3866                 opt_embed = EARGF(usage());
3867                 break;
3868         case 'v':
3869         default:
3870                 usage();
3871         } ARGEND;
3872
3873 run:
3874         setlocale(LC_CTYPE, "");
3875         XSetLocaleModifiers("");
3876         tnew(80, 24);
3877         xinit();
3878         selinit();
3879         run();
3880
3881         return 0;
3882 }
3883