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         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1402
1403         for(i = term.bot; i >= orig+n; i--) {
1404                 temp = term.line[i];
1405                 term.line[i] = term.line[i-n];
1406                 term.line[i-n] = temp;
1407
1408                 term.dirty[i] = 1;
1409                 term.dirty[i-n] = 1;
1410         }
1411
1412         selscroll(orig, n);
1413 }
1414
1415 void
1416 tscrollup(int orig, int n) {
1417         int i;
1418         Line temp;
1419         LIMIT(n, 0, term.bot-orig+1);
1420
1421         tclearregion(0, orig, term.col-1, orig+n-1);
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                  term.dirty[i] = 1;
1429                  term.dirty[i+n] = 1;
1430         }
1431
1432         selscroll(orig, -n);
1433 }
1434
1435 void
1436 selscroll(int orig, int n) {
1437         if(sel.ob.x == -1)
1438                 return;
1439
1440         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1441                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1442                         selclear(NULL);
1443                         return;
1444                 }
1445                 if(sel.type == SEL_RECTANGULAR) {
1446                         if(sel.ob.y < term.top)
1447                                 sel.ob.y = term.top;
1448                         if(sel.oe.y > term.bot)
1449                                 sel.oe.y = term.bot;
1450                 } else {
1451                         if(sel.ob.y < term.top) {
1452                                 sel.ob.y = term.top;
1453                                 sel.ob.x = 0;
1454                         }
1455                         if(sel.oe.y > term.bot) {
1456                                 sel.oe.y = term.bot;
1457                                 sel.oe.x = term.col;
1458                         }
1459                 }
1460                 selsort();
1461         }
1462 }
1463
1464 void
1465 tnewline(int first_col) {
1466         int y = term.c.y;
1467
1468         if(y == term.bot) {
1469                 tscrollup(term.top, 1);
1470         } else {
1471                 y++;
1472         }
1473         tmoveto(first_col ? 0 : term.c.x, y);
1474 }
1475
1476 void
1477 csiparse(void) {
1478         char *p = csiescseq.buf, *np;
1479         long int v;
1480
1481         csiescseq.narg = 0;
1482         if(*p == '?') {
1483                 csiescseq.priv = 1;
1484                 p++;
1485         }
1486
1487         csiescseq.buf[csiescseq.len] = '\0';
1488         while(p < csiescseq.buf+csiescseq.len) {
1489                 np = NULL;
1490                 v = strtol(p, &np, 10);
1491                 if(np == p)
1492                         v = 0;
1493                 if(v == LONG_MAX || v == LONG_MIN)
1494                         v = -1;
1495                 csiescseq.arg[csiescseq.narg++] = v;
1496                 p = np;
1497                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1498                         break;
1499                 p++;
1500         }
1501         csiescseq.mode = *p;
1502 }
1503
1504 /* for absolute user moves, when decom is set */
1505 void
1506 tmoveato(int x, int y) {
1507         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1508 }
1509
1510 void
1511 tmoveto(int x, int y) {
1512         int miny, maxy;
1513
1514         if(term.c.state & CURSOR_ORIGIN) {
1515                 miny = term.top;
1516                 maxy = term.bot;
1517         } else {
1518                 miny = 0;
1519                 maxy = term.row - 1;
1520         }
1521         LIMIT(x, 0, term.col-1);
1522         LIMIT(y, miny, maxy);
1523         term.c.state &= ~CURSOR_WRAPNEXT;
1524         term.c.x = x;
1525         term.c.y = y;
1526 }
1527
1528 void
1529 tsetchar(char *c, Glyph *attr, int x, int y) {
1530         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1531                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1532                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1533                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1534                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1535                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1536                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1537                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1538                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1539         };
1540
1541         /*
1542          * The table is proudly stolen from rxvt.
1543          */
1544         if(attr->mode & ATTR_GFX) {
1545                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1546                         c = vt100_0[c[0] - 0x41];
1547                 }
1548         }
1549
1550         if(term.line[y][x].mode & ATTR_WIDE) {
1551                 if(x+1 < term.col) {
1552                         term.line[y][x+1].c[0] = ' ';
1553                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1554                 }
1555         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1556                 term.line[y][x-1].c[0] = ' ';
1557                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1558         }
1559
1560         term.dirty[y] = 1;
1561         term.line[y][x] = *attr;
1562         memcpy(term.line[y][x].c, c, UTF_SIZ);
1563 }
1564
1565 void
1566 tclearregion(int x1, int y1, int x2, int y2) {
1567         int x, y, temp;
1568
1569         if(x1 > x2)
1570                 temp = x1, x1 = x2, x2 = temp;
1571         if(y1 > y2)
1572                 temp = y1, y1 = y2, y2 = temp;
1573
1574         LIMIT(x1, 0, term.col-1);
1575         LIMIT(x2, 0, term.col-1);
1576         LIMIT(y1, 0, term.row-1);
1577         LIMIT(y2, 0, term.row-1);
1578
1579         for(y = y1; y <= y2; y++) {
1580                 term.dirty[y] = 1;
1581                 for(x = x1; x <= x2; x++) {
1582                         if(selected(x, y))
1583                                 selclear(NULL);
1584                         term.line[y][x] = term.c.attr;
1585                         memcpy(term.line[y][x].c, " ", 2);
1586                 }
1587         }
1588 }
1589
1590 void
1591 tdeletechar(int n) {
1592         int src = term.c.x + n;
1593         int dst = term.c.x;
1594         int size = term.col - src;
1595
1596         term.dirty[term.c.y] = 1;
1597
1598         if(src >= term.col) {
1599                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1600                 return;
1601         }
1602
1603         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1604                         size * sizeof(Glyph));
1605         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1606 }
1607
1608 void
1609 tinsertblank(int n) {
1610         int src = term.c.x;
1611         int dst = src + n;
1612         int size = term.col - dst;
1613
1614         term.dirty[term.c.y] = 1;
1615
1616         if(dst >= term.col) {
1617                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1618                 return;
1619         }
1620
1621         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1622                         size * sizeof(Glyph));
1623         tclearregion(src, term.c.y, dst - 1, term.c.y);
1624 }
1625
1626 void
1627 tinsertblankline(int n) {
1628         if(BETWEEN(term.c.y, term.top, term.bot))
1629                 tscrolldown(term.c.y, n);
1630 }
1631
1632 void
1633 tdeleteline(int n) {
1634         if(BETWEEN(term.c.y, term.top, term.bot))
1635                 tscrollup(term.c.y, n);
1636 }
1637
1638 int32_t
1639 tdefcolor(int *attr, int *npar, int l) {
1640         int32_t idx = -1;
1641         uint r, g, b;
1642
1643         switch (attr[*npar + 1]) {
1644         case 2: /* direct colour in RGB space */
1645                 if (*npar + 4 >= l) {
1646                         fprintf(stderr,
1647                                 "erresc(38): Incorrect number of parameters (%d)\n",
1648                                 *npar);
1649                         break;
1650                 }
1651                 r = attr[*npar + 2];
1652                 g = attr[*npar + 3];
1653                 b = attr[*npar + 4];
1654                 *npar += 4;
1655                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1656                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1657                                 r, g, b);
1658                 else
1659                         idx = TRUECOLOR(r, g, b);
1660                 break;
1661         case 5: /* indexed colour */
1662                 if (*npar + 2 >= l) {
1663                         fprintf(stderr,
1664                                 "erresc(38): Incorrect number of parameters (%d)\n",
1665                                 *npar);
1666                         break;
1667                 }
1668                 *npar += 2;
1669                 if(!BETWEEN(attr[*npar], 0, 255))
1670                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1671                 else
1672                         idx = attr[*npar];
1673                 break;
1674         case 0: /* implemented defined (only foreground) */
1675         case 1: /* transparent */
1676         case 3: /* direct colour in CMY space */
1677         case 4: /* direct colour in CMYK space */
1678         default:
1679                 fprintf(stderr,
1680                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1681         }
1682
1683         return idx;
1684 }
1685
1686 void
1687 tsetattr(int *attr, int l) {
1688         int i;
1689         int32_t idx;
1690
1691         for(i = 0; i < l; i++) {
1692                 switch(attr[i]) {
1693                 case 0:
1694                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1695                                         | ATTR_BOLD | ATTR_ITALIC \
1696                                         | ATTR_BLINK);
1697                         term.c.attr.fg = defaultfg;
1698                         term.c.attr.bg = defaultbg;
1699                         break;
1700                 case 1:
1701                         term.c.attr.mode |= ATTR_BOLD;
1702                         break;
1703                 case 3:
1704                         term.c.attr.mode |= ATTR_ITALIC;
1705                         break;
1706                 case 4:
1707                         term.c.attr.mode |= ATTR_UNDERLINE;
1708                         break;
1709                 case 5: /* slow blink */
1710                 case 6: /* rapid blink */
1711                         term.c.attr.mode |= ATTR_BLINK;
1712                         break;
1713                 case 7:
1714                         term.c.attr.mode |= ATTR_REVERSE;
1715                         break;
1716                 case 21:
1717                 case 22:
1718                         term.c.attr.mode &= ~ATTR_BOLD;
1719                         break;
1720                 case 23:
1721                         term.c.attr.mode &= ~ATTR_ITALIC;
1722                         break;
1723                 case 24:
1724                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1725                         break;
1726                 case 25:
1727                 case 26:
1728                         term.c.attr.mode &= ~ATTR_BLINK;
1729                         break;
1730                 case 27:
1731                         term.c.attr.mode &= ~ATTR_REVERSE;
1732                         break;
1733                 case 38:
1734                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1735                                 term.c.attr.fg = idx;
1736                         break;
1737                 case 39:
1738                         term.c.attr.fg = defaultfg;
1739                         break;
1740                 case 48:
1741                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1742                                 term.c.attr.bg = idx;
1743                         break;
1744                 case 49:
1745                         term.c.attr.bg = defaultbg;
1746                         break;
1747                 default:
1748                         if(BETWEEN(attr[i], 30, 37)) {
1749                                 term.c.attr.fg = attr[i] - 30;
1750                         } else if(BETWEEN(attr[i], 40, 47)) {
1751                                 term.c.attr.bg = attr[i] - 40;
1752                         } else if(BETWEEN(attr[i], 90, 97)) {
1753                                 term.c.attr.fg = attr[i] - 90 + 8;
1754                         } else if(BETWEEN(attr[i], 100, 107)) {
1755                                 term.c.attr.bg = attr[i] - 100 + 8;
1756                         } else {
1757                                 fprintf(stderr,
1758                                         "erresc(default): gfx attr %d unknown\n",
1759                                         attr[i]), csidump();
1760                         }
1761                         break;
1762                 }
1763         }
1764 }
1765
1766 void
1767 tsetscroll(int t, int b) {
1768         int temp;
1769
1770         LIMIT(t, 0, term.row-1);
1771         LIMIT(b, 0, term.row-1);
1772         if(t > b) {
1773                 temp = t;
1774                 t = b;
1775                 b = temp;
1776         }
1777         term.top = t;
1778         term.bot = b;
1779 }
1780
1781 void
1782 tsetmode(bool priv, bool set, int *args, int narg) {
1783         int *lim, mode;
1784         bool alt;
1785
1786         for(lim = args + narg; args < lim; ++args) {
1787                 if(priv) {
1788                         switch(*args) {
1789                                 break;
1790                         case 1: /* DECCKM -- Cursor key */
1791                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1792                                 break;
1793                         case 5: /* DECSCNM -- Reverse video */
1794                                 mode = term.mode;
1795                                 MODBIT(term.mode, set, MODE_REVERSE);
1796                                 if(mode != term.mode)
1797                                         redraw(REDRAW_TIMEOUT);
1798                                 break;
1799                         case 6: /* DECOM -- Origin */
1800                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1801                                 tmoveato(0, 0);
1802                                 break;
1803                         case 7: /* DECAWM -- Auto wrap */
1804                                 MODBIT(term.mode, set, MODE_WRAP);
1805                                 break;
1806                         case 0:  /* Error (IGNORED) */
1807                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1808                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1809                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1810                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1811                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1812                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1813                         case 42: /* DECNRCM -- National characters (IGNORED) */
1814                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1815                                 break;
1816                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1817                                 MODBIT(term.mode, !set, MODE_HIDE);
1818                                 break;
1819                         case 9:    /* X10 mouse compatibility mode */
1820                                 xsetpointermotion(0);
1821                                 MODBIT(term.mode, 0, MODE_MOUSE);
1822                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1823                                 break;
1824                         case 1000: /* 1000: report button press */
1825                                 xsetpointermotion(0);
1826                                 MODBIT(term.mode, 0, MODE_MOUSE);
1827                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1828                                 break;
1829                         case 1002: /* 1002: report motion on button press */
1830                                 xsetpointermotion(0);
1831                                 MODBIT(term.mode, 0, MODE_MOUSE);
1832                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1833                                 break;
1834                         case 1003: /* 1003: enable all mouse motions */
1835                                 xsetpointermotion(set);
1836                                 MODBIT(term.mode, 0, MODE_MOUSE);
1837                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1838                                 break;
1839                         case 1004: /* 1004: send focus events to tty */
1840                                 MODBIT(term.mode, set, MODE_FOCUS);
1841                                 break;
1842                         case 1006: /* 1006: extended reporting mode */
1843                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1844                                 break;
1845                         case 1034:
1846                                 MODBIT(term.mode, set, MODE_8BIT);
1847                                 break;
1848                         case 1049: /* swap screen & set/restore cursor as xterm */
1849                                 if (!allowaltscreen)
1850                                         break;
1851                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1852                                 /* FALLTHRU */
1853                         case 47: /* swap screen */
1854                         case 1047:
1855                                 if (!allowaltscreen)
1856                                         break;
1857                                 alt = IS_SET(MODE_ALTSCREEN);
1858                                 if(alt) {
1859                                         tclearregion(0, 0, term.col-1,
1860                                                         term.row-1);
1861                                 }
1862                                 if(set ^ alt) /* set is always 1 or 0 */
1863                                         tswapscreen();
1864                                 if(*args != 1049)
1865                                         break;
1866                                 /* FALLTRU */
1867                         case 1048:
1868                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1869                                 break;
1870                         case 2004: /* 2004: bracketed paste mode */
1871                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1872                                 break;
1873                         /* Not implemented mouse modes. See comments there. */
1874                         case 1001: /* mouse highlight mode; can hang the
1875                                       terminal by design when implemented. */
1876                         case 1005: /* UTF-8 mouse mode; will confuse
1877                                       applications not supporting UTF-8
1878                                       and luit. */
1879                         case 1015: /* urxvt mangled mouse mode; incompatible
1880                                       and can be mistaken for other control
1881                                       codes. */
1882                         default:
1883                                 fprintf(stderr,
1884                                         "erresc: unknown private set/reset mode %d\n",
1885                                         *args);
1886                                 break;
1887                         }
1888                 } else {
1889                         switch(*args) {
1890                         case 0:  /* Error (IGNORED) */
1891                                 break;
1892                         case 2:  /* KAM -- keyboard action */
1893                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1894                                 break;
1895                         case 4:  /* IRM -- Insertion-replacement */
1896                                 MODBIT(term.mode, set, MODE_INSERT);
1897                                 break;
1898                         case 12: /* SRM -- Send/Receive */
1899                                 MODBIT(term.mode, !set, MODE_ECHO);
1900                                 break;
1901                         case 20: /* LNM -- Linefeed/new line */
1902                                 MODBIT(term.mode, set, MODE_CRLF);
1903                                 break;
1904                         default:
1905                                 fprintf(stderr,
1906                                         "erresc: unknown set/reset mode %d\n",
1907                                         *args);
1908                                 break;
1909                         }
1910                 }
1911         }
1912 }
1913
1914 void
1915 csihandle(void) {
1916         char buf[40];
1917         int len;
1918
1919         switch(csiescseq.mode) {
1920         default:
1921         unknown:
1922                 fprintf(stderr, "erresc: unknown csi ");
1923                 csidump();
1924                 /* die(""); */
1925                 break;
1926         case '@': /* ICH -- Insert <n> blank char */
1927                 DEFAULT(csiescseq.arg[0], 1);
1928                 tinsertblank(csiescseq.arg[0]);
1929                 break;
1930         case 'A': /* CUU -- Cursor <n> Up */
1931                 DEFAULT(csiescseq.arg[0], 1);
1932                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1933                 break;
1934         case 'B': /* CUD -- Cursor <n> Down */
1935         case 'e': /* VPR --Cursor <n> Down */
1936                 DEFAULT(csiescseq.arg[0], 1);
1937                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1938                 break;
1939         case 'i': /* MC -- Media Copy */
1940                 switch(csiescseq.arg[0]) {
1941                 case 0:
1942                         tdump();
1943                         break;
1944                 case 1:
1945                         tdumpline(term.c.y);
1946                         break;
1947                 case 2:
1948                         tdumpsel();
1949                         break;
1950                 case 4:
1951                         term.mode &= ~MODE_PRINT;
1952                         break;
1953                 case 5:
1954                         term.mode |= MODE_PRINT;
1955                         break;
1956                 }
1957                 break;
1958         case 'c': /* DA -- Device Attributes */
1959                 if(csiescseq.arg[0] == 0)
1960                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1961                 break;
1962         case 'C': /* CUF -- Cursor <n> Forward */
1963         case 'a': /* HPR -- Cursor <n> Forward */
1964                 DEFAULT(csiescseq.arg[0], 1);
1965                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1966                 break;
1967         case 'D': /* CUB -- Cursor <n> Backward */
1968                 DEFAULT(csiescseq.arg[0], 1);
1969                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1970                 break;
1971         case 'E': /* CNL -- Cursor <n> Down and first col */
1972                 DEFAULT(csiescseq.arg[0], 1);
1973                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1974                 break;
1975         case 'F': /* CPL -- Cursor <n> Up and first col */
1976                 DEFAULT(csiescseq.arg[0], 1);
1977                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1978                 break;
1979         case 'g': /* TBC -- Tabulation clear */
1980                 switch(csiescseq.arg[0]) {
1981                 case 0: /* clear current tab stop */
1982                         term.tabs[term.c.x] = 0;
1983                         break;
1984                 case 3: /* clear all the tabs */
1985                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1986                         break;
1987                 default:
1988                         goto unknown;
1989                 }
1990                 break;
1991         case 'G': /* CHA -- Move to <col> */
1992         case '`': /* HPA */
1993                 DEFAULT(csiescseq.arg[0], 1);
1994                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1995                 break;
1996         case 'H': /* CUP -- Move to <row> <col> */
1997         case 'f': /* HVP */
1998                 DEFAULT(csiescseq.arg[0], 1);
1999                 DEFAULT(csiescseq.arg[1], 1);
2000                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2001                 break;
2002         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2003                 DEFAULT(csiescseq.arg[0], 1);
2004                 while(csiescseq.arg[0]--)
2005                         tputtab(1);
2006                 break;
2007         case 'J': /* ED -- Clear screen */
2008                 selclear(NULL);
2009                 switch(csiescseq.arg[0]) {
2010                 case 0: /* below */
2011                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2012                         if(term.c.y < term.row-1) {
2013                                 tclearregion(0, term.c.y+1, term.col-1,
2014                                                 term.row-1);
2015                         }
2016                         break;
2017                 case 1: /* above */
2018                         if(term.c.y > 1)
2019                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2020                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2021                         break;
2022                 case 2: /* all */
2023                         tclearregion(0, 0, term.col-1, term.row-1);
2024                         break;
2025                 default:
2026                         goto unknown;
2027                 }
2028                 break;
2029         case 'K': /* EL -- Clear line */
2030                 switch(csiescseq.arg[0]) {
2031                 case 0: /* right */
2032                         tclearregion(term.c.x, term.c.y, term.col-1,
2033                                         term.c.y);
2034                         break;
2035                 case 1: /* left */
2036                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2037                         break;
2038                 case 2: /* all */
2039                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2040                         break;
2041                 }
2042                 break;
2043         case 'S': /* SU -- Scroll <n> line up */
2044                 DEFAULT(csiescseq.arg[0], 1);
2045                 tscrollup(term.top, csiescseq.arg[0]);
2046                 break;
2047         case 'T': /* SD -- Scroll <n> line down */
2048                 DEFAULT(csiescseq.arg[0], 1);
2049                 tscrolldown(term.top, csiescseq.arg[0]);
2050                 break;
2051         case 'L': /* IL -- Insert <n> blank lines */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tinsertblankline(csiescseq.arg[0]);
2054                 break;
2055         case 'l': /* RM -- Reset Mode */
2056                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2057                 break;
2058         case 'M': /* DL -- Delete <n> lines */
2059                 DEFAULT(csiescseq.arg[0], 1);
2060                 tdeleteline(csiescseq.arg[0]);
2061                 break;
2062         case 'X': /* ECH -- Erase <n> char */
2063                 DEFAULT(csiescseq.arg[0], 1);
2064                 tclearregion(term.c.x, term.c.y,
2065                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2066                 break;
2067         case 'P': /* DCH -- Delete <n> char */
2068                 DEFAULT(csiescseq.arg[0], 1);
2069                 tdeletechar(csiescseq.arg[0]);
2070                 break;
2071         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 while(csiescseq.arg[0]--)
2074                         tputtab(0);
2075                 break;
2076         case 'd': /* VPA -- Move to <row> */
2077                 DEFAULT(csiescseq.arg[0], 1);
2078                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2079                 break;
2080         case 'h': /* SM -- Set terminal mode */
2081                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2082                 break;
2083         case 'm': /* SGR -- Terminal attribute (color) */
2084                 tsetattr(csiescseq.arg, csiescseq.narg);
2085                 break;
2086         case 'n': /* DSR – Device Status Report (cursor position) */
2087                 if (csiescseq.arg[0] == 6) {
2088                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2089                                         term.c.y+1, term.c.x+1);
2090                         ttywrite(buf, len);
2091                         break;
2092                 }
2093         case 'r': /* DECSTBM -- Set Scrolling Region */
2094                 if(csiescseq.priv) {
2095                         goto unknown;
2096                 } else {
2097                         DEFAULT(csiescseq.arg[0], 1);
2098                         DEFAULT(csiescseq.arg[1], term.row);
2099                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2100                         tmoveato(0, 0);
2101                 }
2102                 break;
2103         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2104                 tcursor(CURSOR_SAVE);
2105                 break;
2106         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2107                 tcursor(CURSOR_LOAD);
2108                 break;
2109         }
2110 }
2111
2112 void
2113 csidump(void) {
2114         int i;
2115         uint c;
2116
2117         printf("ESC[");
2118         for(i = 0; i < csiescseq.len; i++) {
2119                 c = csiescseq.buf[i] & 0xff;
2120                 if(isprint(c)) {
2121                         putchar(c);
2122                 } else if(c == '\n') {
2123                         printf("(\\n)");
2124                 } else if(c == '\r') {
2125                         printf("(\\r)");
2126                 } else if(c == 0x1b) {
2127                         printf("(\\e)");
2128                 } else {
2129                         printf("(%02x)", c);
2130                 }
2131         }
2132         putchar('\n');
2133 }
2134
2135 void
2136 csireset(void) {
2137         memset(&csiescseq, 0, sizeof(csiescseq));
2138 }
2139
2140 void
2141 strhandle(void) {
2142         char *p = NULL;
2143         int j, narg, par;
2144
2145         strparse();
2146         narg = strescseq.narg;
2147         par = atoi(strescseq.args[0]);
2148
2149         switch(strescseq.type) {
2150         case ']': /* OSC -- Operating System Command */
2151                 switch(par) {
2152                 case 0:
2153                 case 1:
2154                 case 2:
2155                         if(narg > 1)
2156                                 xsettitle(strescseq.args[1]);
2157                         return;
2158                 case 4: /* color set */
2159                         if(narg < 3)
2160                                 break;
2161                         p = strescseq.args[2];
2162                         /* fall through */
2163                 case 104: /* color reset, here p = NULL */
2164                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2165                         if (!xsetcolorname(j, p)) {
2166                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2167                         } else {
2168                                 /*
2169                                  * TODO if defaultbg color is changed, borders
2170                                  * are dirty
2171                                  */
2172                                 redraw(0);
2173                         }
2174                         return;
2175                 }
2176                 break;
2177         case 'k': /* old title set compatibility */
2178                 xsettitle(strescseq.args[0]);
2179                 return;
2180         case 'P': /* DSC -- Device Control String */
2181         case '_': /* APC -- Application Program Command */
2182         case '^': /* PM -- Privacy Message */
2183                 return;
2184         }
2185
2186         fprintf(stderr, "erresc: unknown str ");
2187         strdump();
2188 }
2189
2190 void
2191 strparse(void) {
2192         char *p = strescseq.buf;
2193
2194         strescseq.narg = 0;
2195         strescseq.buf[strescseq.len] = '\0';
2196         while(p && strescseq.narg < STR_ARG_SIZ)
2197                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2198 }
2199
2200 void
2201 strdump(void) {
2202         int i;
2203         uint c;
2204
2205         printf("ESC%c", strescseq.type);
2206         for(i = 0; i < strescseq.len; i++) {
2207                 c = strescseq.buf[i] & 0xff;
2208                 if(c == '\0') {
2209                         return;
2210                 } else if(isprint(c)) {
2211                         putchar(c);
2212                 } else if(c == '\n') {
2213                         printf("(\\n)");
2214                 } else if(c == '\r') {
2215                         printf("(\\r)");
2216                 } else if(c == 0x1b) {
2217                         printf("(\\e)");
2218                 } else {
2219                         printf("(%02x)", c);
2220                 }
2221         }
2222         printf("ESC\\\n");
2223 }
2224
2225 void
2226 strreset(void) {
2227         memset(&strescseq, 0, sizeof(strescseq));
2228 }
2229
2230 void
2231 tprinter(char *s, size_t len) {
2232         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2233                 fprintf(stderr, "Error writing in %s:%s\n",
2234                         opt_io, strerror(errno));
2235                 close(iofd);
2236                 iofd = -1;
2237         }
2238 }
2239
2240 void
2241 toggleprinter(const Arg *arg) {
2242         term.mode ^= MODE_PRINT;
2243 }
2244
2245 void
2246 printscreen(const Arg *arg) {
2247         tdump();
2248 }
2249
2250 void
2251 printsel(const Arg *arg) {
2252         tdumpsel();
2253 }
2254
2255 void
2256 tdumpsel(void) {
2257         char *ptr;
2258
2259         if((ptr = getsel())) {
2260                 tprinter(ptr, strlen(ptr));
2261                 free(ptr);
2262         }
2263 }
2264
2265 void
2266 tdumpline(int n) {
2267         Glyph *bp, *end;
2268
2269         bp = &term.line[n][0];
2270         end = &bp[term.col-1];
2271         while(end > bp && !strcmp(" ", end->c))
2272                 --end;
2273         if(bp != end || strcmp(bp->c, " ")) {
2274                 for( ;bp <= end; ++bp)
2275                         tprinter(bp->c, strlen(bp->c));
2276         }
2277         tprinter("\n", 1);
2278 }
2279
2280 void
2281 tdump(void) {
2282         int i;
2283
2284         for(i = 0; i < term.row; ++i)
2285                 tdumpline(i);
2286 }
2287
2288 void
2289 tputtab(bool forward) {
2290         uint x = term.c.x;
2291
2292         if(forward) {
2293                 if(x == term.col)
2294                         return;
2295                 for(++x; x < term.col && !term.tabs[x]; ++x)
2296                         /* nothing */ ;
2297         } else {
2298                 if(x == 0)
2299                         return;
2300                 for(--x; x > 0 && !term.tabs[x]; --x)
2301                         /* nothing */ ;
2302         }
2303         tmoveto(x, term.c.y);
2304 }
2305
2306 void
2307 techo(char *buf, int len) {
2308         for(; len > 0; buf++, len--) {
2309                 char c = *buf;
2310
2311                 if(c < 0x20 || c == 0177) { /* control code */
2312                         if(c != '\n' && c != '\r' && c != '\t') {
2313                                 c ^= '\x40';
2314                                 tputc("^", 1);
2315                         }
2316                         tputc(&c, 1);
2317                 } else {
2318                         break;
2319                 }
2320         }
2321         if(len)
2322                 tputc(buf, len);
2323 }
2324
2325 void
2326 tdeftran(char ascii) {
2327         char c, (*bp)[2];
2328         static char tbl[][2] = {
2329                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2330                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2331                 {'5', CS_FIN},      {'C', CS_FIN},
2332                 {0, 0}
2333         };
2334
2335         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2336                 /* nothing */;
2337
2338         if (c == 0)
2339                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2340         else
2341                 term.trantbl[term.icharset] = (*bp)[1];
2342 }
2343
2344 void
2345 tselcs(void) {
2346         MODBIT(term.c.attr.mode,
2347                term.trantbl[term.charset] == CS_GRAPHIC0,
2348                ATTR_GFX);
2349 }
2350
2351 void
2352 tputc(char *c, int len) {
2353         uchar ascii = *c;
2354         bool control = ascii < '\x20' || ascii == 0177;
2355         long unicodep;
2356         int width;
2357
2358         if(len == 1) {
2359                 width = 1;
2360         } else {
2361                 utf8decode(c, &unicodep, UTF_SIZ);
2362                 width = wcwidth(unicodep);
2363         }
2364
2365         if(IS_SET(MODE_PRINT))
2366                 tprinter(c, len);
2367
2368         /*
2369          * STR sequences must be checked before anything else
2370          * because it can use some control codes as part of the sequence.
2371          */
2372         if(term.esc & ESC_STR) {
2373                 switch(ascii) {
2374                 case '\033':
2375                         term.esc = ESC_START | ESC_STR_END;
2376                         break;
2377                 case '\a': /* backwards compatibility to xterm */
2378                         term.esc = 0;
2379                         strhandle();
2380                         break;
2381                 default:
2382                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2383                                 memmove(&strescseq.buf[strescseq.len], c, len);
2384                                 strescseq.len += len;
2385                         } else {
2386                         /*
2387                          * Here is a bug in terminals. If the user never sends
2388                          * some code to stop the str or esc command, then st
2389                          * will stop responding. But this is better than
2390                          * silently failing with unknown characters. At least
2391                          * then users will report back.
2392                          *
2393                          * In the case users ever get fixed, here is the code:
2394                          */
2395                         /*
2396                          * term.esc = 0;
2397                          * strhandle();
2398                          */
2399                         }
2400                 }
2401                 return;
2402         }
2403
2404         /*
2405          * Actions of control codes must be performed as soon they arrive
2406          * because they can be embedded inside a control sequence, and
2407          * they must not cause conflicts with sequences.
2408          */
2409         if(control) {
2410                 switch(ascii) {
2411                 case '\t':   /* HT */
2412                         tputtab(1);
2413                         return;
2414                 case '\b':   /* BS */
2415                         tmoveto(term.c.x-1, term.c.y);
2416                         return;
2417                 case '\r':   /* CR */
2418                         tmoveto(0, term.c.y);
2419                         return;
2420                 case '\f':   /* LF */
2421                 case '\v':   /* VT */
2422                 case '\n':   /* LF */
2423                         /* go to first col if the mode is set */
2424                         tnewline(IS_SET(MODE_CRLF));
2425                         return;
2426                 case '\a':   /* BEL */
2427                         if(!(xw.state & WIN_FOCUSED))
2428                                 xseturgency(1);
2429                         if (bellvolume)
2430                                 XBell(xw.dpy, bellvolume);
2431                         return;
2432                 case '\033': /* ESC */
2433                         csireset();
2434                         term.esc = ESC_START;
2435                         return;
2436                 case '\016': /* SO */
2437                         term.charset = 0;
2438                         tselcs();
2439                         return;
2440                 case '\017': /* SI */
2441                         term.charset = 1;
2442                         tselcs();
2443                         return;
2444                 case '\032': /* SUB */
2445                 case '\030': /* CAN */
2446                         csireset();
2447                         return;
2448                 case '\005': /* ENQ (IGNORED) */
2449                 case '\000': /* NUL (IGNORED) */
2450                 case '\021': /* XON (IGNORED) */
2451                 case '\023': /* XOFF (IGNORED) */
2452                 case 0177:   /* DEL (IGNORED) */
2453                         return;
2454                 }
2455         } else if(term.esc & ESC_START) {
2456                 if(term.esc & ESC_CSI) {
2457                         csiescseq.buf[csiescseq.len++] = ascii;
2458                         if(BETWEEN(ascii, 0x40, 0x7E)
2459                                         || csiescseq.len >= \
2460                                         sizeof(csiescseq.buf)-1) {
2461                                 term.esc = 0;
2462                                 csiparse();
2463                                 csihandle();
2464                         }
2465                 } else if(term.esc & ESC_STR_END) {
2466                         term.esc = 0;
2467                         if(ascii == '\\')
2468                                 strhandle();
2469                 } else if(term.esc & ESC_ALTCHARSET) {
2470                         tdeftran(ascii);
2471                         tselcs();
2472                         term.esc = 0;
2473                 } else if(term.esc & ESC_TEST) {
2474                         if(ascii == '8') { /* DEC screen alignment test. */
2475                                 char E[UTF_SIZ] = "E";
2476                                 int x, y;
2477
2478                                 for(x = 0; x < term.col; ++x) {
2479                                         for(y = 0; y < term.row; ++y)
2480                                                 tsetchar(E, &term.c.attr, x, y);
2481                                 }
2482                         }
2483                         term.esc = 0;
2484                 } else {
2485                         switch(ascii) {
2486                         case '[':
2487                                 term.esc |= ESC_CSI;
2488                                 break;
2489                         case '#':
2490                                 term.esc |= ESC_TEST;
2491                                 break;
2492                         case 'P': /* DCS -- Device Control String */
2493                         case '_': /* APC -- Application Program Command */
2494                         case '^': /* PM -- Privacy Message */
2495                         case ']': /* OSC -- Operating System Command */
2496                         case 'k': /* old title set compatibility */
2497                                 strreset();
2498                                 strescseq.type = ascii;
2499                                 term.esc |= ESC_STR;
2500                                 break;
2501                         case '(': /* set primary charset G0 */
2502                         case ')': /* set secondary charset G1 */
2503                         case '*': /* set tertiary charset G2 */
2504                         case '+': /* set quaternary charset G3 */
2505                                 term.icharset = ascii - '(';
2506                                 term.esc |= ESC_ALTCHARSET;
2507                                 break;
2508                         case 'D': /* IND -- Linefeed */
2509                                 if(term.c.y == term.bot) {
2510                                         tscrollup(term.top, 1);
2511                                 } else {
2512                                         tmoveto(term.c.x, term.c.y+1);
2513                                 }
2514                                 term.esc = 0;
2515                                 break;
2516                         case 'E': /* NEL -- Next line */
2517                                 tnewline(1); /* always go to first col */
2518                                 term.esc = 0;
2519                                 break;
2520                         case 'H': /* HTS -- Horizontal tab stop */
2521                                 term.tabs[term.c.x] = 1;
2522                                 term.esc = 0;
2523                                 break;
2524                         case 'M': /* RI -- Reverse index */
2525                                 if(term.c.y == term.top) {
2526                                         tscrolldown(term.top, 1);
2527                                 } else {
2528                                         tmoveto(term.c.x, term.c.y-1);
2529                                 }
2530                                 term.esc = 0;
2531                                 break;
2532                         case 'Z': /* DECID -- Identify Terminal */
2533                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2534                                 term.esc = 0;
2535                                 break;
2536                         case 'c': /* RIS -- Reset to inital state */
2537                                 treset();
2538                                 term.esc = 0;
2539                                 xresettitle();
2540                                 xloadcols();
2541                                 break;
2542                         case '=': /* DECPAM -- Application keypad */
2543                                 term.mode |= MODE_APPKEYPAD;
2544                                 term.esc = 0;
2545                                 break;
2546                         case '>': /* DECPNM -- Normal keypad */
2547                                 term.mode &= ~MODE_APPKEYPAD;
2548                                 term.esc = 0;
2549                                 break;
2550                         case '7': /* DECSC -- Save Cursor */
2551                                 tcursor(CURSOR_SAVE);
2552                                 term.esc = 0;
2553                                 break;
2554                         case '8': /* DECRC -- Restore Cursor */
2555                                 tcursor(CURSOR_LOAD);
2556                                 term.esc = 0;
2557                                 break;
2558                         case '\\': /* ST -- Stop */
2559                                 term.esc = 0;
2560                                 break;
2561                         default:
2562                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2563                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2564                                 term.esc = 0;
2565                         }
2566                 }
2567                 /*
2568                  * All characters which form part of a sequence are not
2569                  * printed
2570                  */
2571                 return;
2572         }
2573         /*
2574          * Display control codes only if we are in graphic mode
2575          */
2576         if(control && !(term.c.attr.mode & ATTR_GFX))
2577                 return;
2578         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2579                 selclear(NULL);
2580         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2581                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2582                 tnewline(1);
2583         }
2584
2585         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2586                 memmove(&term.line[term.c.y][term.c.x+1],
2587                         &term.line[term.c.y][term.c.x],
2588                         (term.col - term.c.x - 1) * sizeof(Glyph));
2589         }
2590
2591         if(term.c.x+width > term.col)
2592                 tnewline(1);
2593
2594         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2595
2596         if(width == 2) {
2597                 term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
2598                 if(term.c.x+1 < term.col) {
2599                         term.line[term.c.y][term.c.x+1].c[0] = '\0';
2600                         term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
2601                 }
2602         }
2603         if(term.c.x+width < term.col) {
2604                 tmoveto(term.c.x+width, term.c.y);
2605         } else {
2606                 term.c.state |= CURSOR_WRAPNEXT;
2607         }
2608 }
2609
2610 int
2611 tresize(int col, int row) {
2612         int i;
2613         int minrow = MIN(row, term.row);
2614         int mincol = MIN(col, term.col);
2615         int slide = term.c.y - row + 1;
2616         bool *bp;
2617         Line *orig;
2618
2619         if(col < 1 || row < 1)
2620                 return 0;
2621
2622         /* free unneeded rows */
2623         i = 0;
2624         if(slide > 0) {
2625                 /*
2626                  * slide screen to keep cursor where we expect it -
2627                  * tscrollup would work here, but we can optimize to
2628                  * memmove because we're freeing the earlier lines
2629                  */
2630                 for(/* i = 0 */; i < slide; i++) {
2631                         free(term.line[i]);
2632                         free(term.alt[i]);
2633                 }
2634                 memmove(term.line, term.line + slide, row * sizeof(Line));
2635                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2636         }
2637         for(i += row; i < term.row; i++) {
2638                 free(term.line[i]);
2639                 free(term.alt[i]);
2640         }
2641
2642         /* resize to new height */
2643         term.line = xrealloc(term.line, row * sizeof(Line));
2644         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2645         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2646         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2647
2648         /* resize each row to new width, zero-pad if needed */
2649         for(i = 0; i < minrow; i++) {
2650                 term.dirty[i] = 1;
2651                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2652                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2653         }
2654
2655         /* allocate any new rows */
2656         for(/* i == minrow */; i < row; i++) {
2657                 term.dirty[i] = 1;
2658                 term.line[i] = xmalloc(col * sizeof(Glyph));
2659                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2660         }
2661         if(col > term.col) {
2662                 bp = term.tabs + term.col;
2663
2664                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2665                 while(--bp > term.tabs && !*bp)
2666                         /* nothing */ ;
2667                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2668                         *bp = 1;
2669         }
2670         /* update terminal size */
2671         term.col = col;
2672         term.row = row;
2673         /* reset scrolling region */
2674         tsetscroll(0, row-1);
2675         /* make use of the LIMIT in tmoveto */
2676         tmoveto(term.c.x, term.c.y);
2677         /* Clearing both screens */
2678         orig = term.line;
2679         do {
2680                 if(mincol < col && 0 < minrow) {
2681                         tclearregion(mincol, 0, col - 1, minrow - 1);
2682                 }
2683                 if(0 < col && minrow < row) {
2684                         tclearregion(0, minrow, col - 1, row - 1);
2685                 }
2686                 tswapscreen();
2687         } while(orig != term.line);
2688
2689         return (slide > 0);
2690 }
2691
2692 void
2693 xresize(int col, int row) {
2694         xw.tw = MAX(1, col * xw.cw);
2695         xw.th = MAX(1, row * xw.ch);
2696
2697         XFreePixmap(xw.dpy, xw.buf);
2698         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2699                         DefaultDepth(xw.dpy, xw.scr));
2700         XftDrawChange(xw.draw, xw.buf);
2701         xclear(0, 0, xw.w, xw.h);
2702 }
2703
2704 static inline ushort
2705 sixd_to_16bit(int x) {
2706         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2707 }
2708
2709 void
2710 xloadcols(void) {
2711         int i, r, g, b;
2712         XRenderColor color = { .alpha = 0xffff };
2713         static bool loaded;
2714         Colour *cp;
2715
2716         if(loaded) {
2717                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2718                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2719         }
2720
2721         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2722         for(i = 0; i < LEN(colorname); i++) {
2723                 if(!colorname[i])
2724                         continue;
2725                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2726                         die("Could not allocate color '%s'\n", colorname[i]);
2727                 }
2728         }
2729
2730         /* load colors [16-255] ; same colors as xterm */
2731         for(i = 16, r = 0; r < 6; r++) {
2732                 for(g = 0; g < 6; g++) {
2733                         for(b = 0; b < 6; b++) {
2734                                 color.red = sixd_to_16bit(r);
2735                                 color.green = sixd_to_16bit(g);
2736                                 color.blue = sixd_to_16bit(b);
2737                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2738                                         die("Could not allocate color %d\n", i);
2739                                 }
2740                                 i++;
2741                         }
2742                 }
2743         }
2744
2745         for(r = 0; r < 24; r++, i++) {
2746                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2747                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2748                                         &dc.col[i])) {
2749                         die("Could not allocate color %d\n", i);
2750                 }
2751         }
2752         loaded = true;
2753 }
2754
2755 int
2756 xsetcolorname(int x, const char *name) {
2757         XRenderColor color = { .alpha = 0xffff };
2758         Colour colour;
2759         if (x < 0 || x > LEN(colorname))
2760                 return -1;
2761         if(!name) {
2762                 if(16 <= x && x < 16 + 216) {
2763                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2764                         color.red = sixd_to_16bit(r);
2765                         color.green = sixd_to_16bit(g);
2766                         color.blue = sixd_to_16bit(b);
2767                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2768                                 return 0; /* something went wrong */
2769                         dc.col[x] = colour;
2770                         return 1;
2771                 } else if (16 + 216 <= x && x < 256) {
2772                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2773                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2774                                 return 0; /* something went wrong */
2775                         dc.col[x] = colour;
2776                         return 1;
2777                 } else {
2778                         name = colorname[x];
2779                 }
2780         }
2781         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2782                 return 0;
2783         dc.col[x] = colour;
2784         return 1;
2785 }
2786
2787 void
2788 xtermclear(int col1, int row1, int col2, int row2) {
2789         XftDrawRect(xw.draw,
2790                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2791                         borderpx + col1 * xw.cw,
2792                         borderpx + row1 * xw.ch,
2793                         (col2-col1+1) * xw.cw,
2794                         (row2-row1+1) * xw.ch);
2795 }
2796
2797 /*
2798  * Absolute coordinates.
2799  */
2800 void
2801 xclear(int x1, int y1, int x2, int y2) {
2802         XftDrawRect(xw.draw,
2803                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2804                         x1, y1, x2-x1, y2-y1);
2805 }
2806
2807 void
2808 xhints(void) {
2809         XClassHint class = {opt_class ? opt_class : termname, termname};
2810         XWMHints wm = {.flags = InputHint, .input = 1};
2811         XSizeHints *sizeh = NULL;
2812
2813         sizeh = XAllocSizeHints();
2814         if(xw.isfixed == False) {
2815                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2816                 sizeh->height = xw.h;
2817                 sizeh->width = xw.w;
2818                 sizeh->height_inc = xw.ch;
2819                 sizeh->width_inc = xw.cw;
2820                 sizeh->base_height = 2 * borderpx;
2821                 sizeh->base_width = 2 * borderpx;
2822         } else {
2823                 sizeh->flags = PMaxSize | PMinSize;
2824                 sizeh->min_width = sizeh->max_width = xw.fw;
2825                 sizeh->min_height = sizeh->max_height = xw.fh;
2826         }
2827
2828         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2829                         &class);
2830         XFree(sizeh);
2831 }
2832
2833 int
2834 xloadfont(Font *f, FcPattern *pattern) {
2835         FcPattern *match;
2836         FcResult result;
2837
2838         match = FcFontMatch(NULL, pattern, &result);
2839         if(!match)
2840                 return 1;
2841
2842         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2843                 FcPatternDestroy(match);
2844                 return 1;
2845         }
2846
2847         f->set = NULL;
2848         f->pattern = FcPatternDuplicate(pattern);
2849
2850         f->ascent = f->match->ascent;
2851         f->descent = f->match->descent;
2852         f->lbearing = 0;
2853         f->rbearing = f->match->max_advance_width;
2854
2855         f->height = f->ascent + f->descent;
2856         f->width = f->lbearing + f->rbearing;
2857
2858         return 0;
2859 }
2860
2861 void
2862 xloadfonts(char *fontstr, double fontsize) {
2863         FcPattern *pattern;
2864         FcResult r_sz, r_psz;
2865         double fontval;
2866
2867         if(fontstr[0] == '-') {
2868                 pattern = XftXlfdParse(fontstr, False, False);
2869         } else {
2870                 pattern = FcNameParse((FcChar8 *)fontstr);
2871         }
2872
2873         if(!pattern)
2874                 die("st: can't open font %s\n", fontstr);
2875
2876         if(fontsize > 0) {
2877                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2878                 FcPatternDel(pattern, FC_SIZE);
2879                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2880                 usedfontsize = fontsize;
2881         } else {
2882                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2883                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2884                 if(r_psz == FcResultMatch) {
2885                         usedfontsize = fontval;
2886                 } else if(r_sz == FcResultMatch) {
2887                         usedfontsize = -1;
2888                 } else {
2889                         /*
2890                          * Default font size is 12, if none given. This is to
2891                          * have a known usedfontsize value.
2892                          */
2893                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2894                         usedfontsize = 12;
2895                 }
2896         }
2897
2898         FcConfigSubstitute(0, pattern, FcMatchPattern);
2899         FcDefaultSubstitute(pattern);
2900
2901         if(xloadfont(&dc.font, pattern))
2902                 die("st: can't open font %s\n", fontstr);
2903
2904         if(usedfontsize < 0) {
2905                 FcPatternGetDouble(dc.font.match->pattern,
2906                                    FC_PIXEL_SIZE, 0, &fontval);
2907                 usedfontsize = fontval;
2908         }
2909
2910         /* Setting character width and height. */
2911         xw.cw = CEIL(dc.font.width * cwscale);
2912         xw.ch = CEIL(dc.font.height * chscale);
2913
2914         FcPatternDel(pattern, FC_SLANT);
2915         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2916         if(xloadfont(&dc.ifont, pattern))
2917                 die("st: can't open font %s\n", fontstr);
2918
2919         FcPatternDel(pattern, FC_WEIGHT);
2920         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2921         if(xloadfont(&dc.ibfont, pattern))
2922                 die("st: can't open font %s\n", fontstr);
2923
2924         FcPatternDel(pattern, FC_SLANT);
2925         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2926         if(xloadfont(&dc.bfont, pattern))
2927                 die("st: can't open font %s\n", fontstr);
2928
2929         FcPatternDestroy(pattern);
2930 }
2931
2932 int
2933 xloadfontset(Font *f) {
2934         FcResult result;
2935
2936         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2937                 return 1;
2938         return 0;
2939 }
2940
2941 void
2942 xunloadfont(Font *f) {
2943         XftFontClose(xw.dpy, f->match);
2944         FcPatternDestroy(f->pattern);
2945         if(f->set)
2946                 FcFontSetDestroy(f->set);
2947 }
2948
2949 void
2950 xunloadfonts(void) {
2951         int i;
2952
2953         /* Free the loaded fonts in the font cache.  */
2954         for(i = 0; i < frclen; i++) {
2955                 XftFontClose(xw.dpy, frc[i].font);
2956         }
2957         frclen = 0;
2958
2959         xunloadfont(&dc.font);
2960         xunloadfont(&dc.bfont);
2961         xunloadfont(&dc.ifont);
2962         xunloadfont(&dc.ibfont);
2963 }
2964
2965 void
2966 xzoom(const Arg *arg) {
2967         xunloadfonts();
2968         xloadfonts(usedfont, usedfontsize + arg->i);
2969         cresize(0, 0);
2970         redraw(0);
2971 }
2972
2973 void
2974 xinit(void) {
2975         XGCValues gcvalues;
2976         Cursor cursor;
2977         Window parent;
2978         int sw, sh;
2979         pid_t thispid = getpid();
2980
2981         if(!(xw.dpy = XOpenDisplay(NULL)))
2982                 die("Can't open display\n");
2983         xw.scr = XDefaultScreen(xw.dpy);
2984         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2985
2986         /* font */
2987         if(!FcInit())
2988                 die("Could not init fontconfig.\n");
2989
2990         usedfont = (opt_font == NULL)? font : opt_font;
2991         xloadfonts(usedfont, 0);
2992
2993         /* colors */
2994         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2995         xloadcols();
2996
2997         /* adjust fixed window geometry */
2998         if(xw.isfixed) {
2999                 sw = DisplayWidth(xw.dpy, xw.scr);
3000                 sh = DisplayHeight(xw.dpy, xw.scr);
3001                 if(xw.fx < 0)
3002                         xw.fx = sw + xw.fx - xw.fw - 1;
3003                 if(xw.fy < 0)
3004                         xw.fy = sh + xw.fy - xw.fh - 1;
3005
3006                 xw.h = xw.fh;
3007                 xw.w = xw.fw;
3008         } else {
3009                 /* window - default size */
3010                 xw.h = 2 * borderpx + term.row * xw.ch;
3011                 xw.w = 2 * borderpx + term.col * xw.cw;
3012                 xw.fx = 0;
3013                 xw.fy = 0;
3014         }
3015
3016         /* Events */
3017         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3018         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3019         xw.attrs.bit_gravity = NorthWestGravity;
3020         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3021                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3022                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3023         xw.attrs.colormap = xw.cmap;
3024
3025         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3026                         XRootWindow(xw.dpy, xw.scr);
3027         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
3028                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3029                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3030                         | CWEventMask | CWColormap, &xw.attrs);
3031
3032         memset(&gcvalues, 0, sizeof(gcvalues));
3033         gcvalues.graphics_exposures = False;
3034         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3035                         &gcvalues);
3036         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3037                         DefaultDepth(xw.dpy, xw.scr));
3038         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3039         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3040
3041         /* Xft rendering context */
3042         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3043
3044         /* input methods */
3045         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3046                 XSetLocaleModifiers("@im=local");
3047                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3048                         XSetLocaleModifiers("@im=");
3049                         if((xw.xim = XOpenIM(xw.dpy,
3050                                         NULL, NULL, NULL)) == NULL) {
3051                                 die("XOpenIM failed. Could not open input"
3052                                         " device.\n");
3053                         }
3054                 }
3055         }
3056         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3057                                            | XIMStatusNothing, XNClientWindow, xw.win,
3058                                            XNFocusWindow, xw.win, NULL);
3059         if(xw.xic == NULL)
3060                 die("XCreateIC failed. Could not obtain input method.\n");
3061
3062         /* white cursor, black outline */
3063         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3064         XDefineCursor(xw.dpy, xw.win, cursor);
3065         XRecolorCursor(xw.dpy, cursor,
3066                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3067                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3068
3069         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3070         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3071         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3072         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3073
3074         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3075         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3076                         PropModeReplace, (uchar *)&thispid, 1);
3077
3078         xresettitle();
3079         XMapWindow(xw.dpy, xw.win);
3080         xhints();
3081         XSync(xw.dpy, False);
3082 }
3083
3084 void
3085 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3086         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3087             width = charlen * xw.cw, xp, i;
3088         int frcflags;
3089         int u8fl, u8fblen, u8cblen, doesexist;
3090         char *u8c, *u8fs;
3091         long unicodep;
3092         Font *font = &dc.font;
3093         FcResult fcres;
3094         FcPattern *fcpattern, *fontpattern;
3095         FcFontSet *fcsets[] = { NULL };
3096         FcCharSet *fccharset;
3097         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3098         XRenderColor colfg, colbg;
3099         XRectangle r;
3100         int oneatatime;
3101
3102         frcflags = FRC_NORMAL;
3103
3104         if(base.mode & ATTR_ITALIC) {
3105                 if(base.fg == defaultfg)
3106                         base.fg = defaultitalic;
3107                 font = &dc.ifont;
3108                 frcflags = FRC_ITALIC;
3109         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3110                 if(base.fg == defaultfg)
3111                         base.fg = defaultitalic;
3112                 font = &dc.ibfont;
3113                 frcflags = FRC_ITALICBOLD;
3114         } else if(base.mode & ATTR_UNDERLINE) {
3115                 if(base.fg == defaultfg)
3116                         base.fg = defaultunderline;
3117         }
3118
3119         if(IS_TRUECOL(base.fg)) {
3120                 colfg.alpha = 0xffff;
3121                 colfg.red = TRUERED(base.fg);
3122                 colfg.green = TRUEGREEN(base.fg);
3123                 colfg.blue = TRUEBLUE(base.fg);
3124                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3125                 fg = &truefg;
3126         } else {
3127                 fg = &dc.col[base.fg];
3128         }
3129
3130         if(IS_TRUECOL(base.bg)) {
3131                 colbg.alpha = 0xffff;
3132                 colbg.green = TRUEGREEN(base.bg);
3133                 colbg.red = TRUERED(base.bg);
3134                 colbg.blue = TRUEBLUE(base.bg);
3135                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3136                 bg = &truebg;
3137         } else {
3138                 bg = &dc.col[base.bg];
3139         }
3140
3141         if(base.mode & ATTR_BOLD) {
3142                 if(BETWEEN(base.fg, 0, 7)) {
3143                         /* basic system colors */
3144                         fg = &dc.col[base.fg + 8];
3145                 } else if(BETWEEN(base.fg, 16, 195)) {
3146                         /* 256 colors */
3147                         fg = &dc.col[base.fg + 36];
3148                 } else if(BETWEEN(base.fg, 232, 251)) {
3149                         /* greyscale */
3150                         fg = &dc.col[base.fg + 4];
3151                 }
3152                 /*
3153                  * Those ranges will not be brightened:
3154                  *    8 - 15 – bright system colors
3155                  *    196 - 231 – highest 256 color cube
3156                  *    252 - 255 – brightest colors in greyscale
3157                  */
3158                 font = &dc.bfont;
3159                 frcflags = FRC_BOLD;
3160         }
3161
3162         if(IS_SET(MODE_REVERSE)) {
3163                 if(fg == &dc.col[defaultfg]) {
3164                         fg = &dc.col[defaultbg];
3165                 } else {
3166                         colfg.red = ~fg->color.red;
3167                         colfg.green = ~fg->color.green;
3168                         colfg.blue = ~fg->color.blue;
3169                         colfg.alpha = fg->color.alpha;
3170                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3171                                         &revfg);
3172                         fg = &revfg;
3173                 }
3174
3175                 if(bg == &dc.col[defaultbg]) {
3176                         bg = &dc.col[defaultfg];
3177                 } else {
3178                         colbg.red = ~bg->color.red;
3179                         colbg.green = ~bg->color.green;
3180                         colbg.blue = ~bg->color.blue;
3181                         colbg.alpha = bg->color.alpha;
3182                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3183                                         &revbg);
3184                         bg = &revbg;
3185                 }
3186         }
3187
3188         if(base.mode & ATTR_REVERSE) {
3189                 temp = fg;
3190                 fg = bg;
3191                 bg = temp;
3192         }
3193
3194         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3195                 fg = bg;
3196
3197         /* Intelligent cleaning up of the borders. */
3198         if(x == 0) {
3199                 xclear(0, (y == 0)? 0 : winy, borderpx,
3200                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3201         }
3202         if(x + charlen >= term.col) {
3203                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3204                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3205         }
3206         if(y == 0)
3207                 xclear(winx, 0, winx + width, borderpx);
3208         if(y == term.row-1)
3209                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3210
3211         /* Clean up the region we want to draw to. */
3212         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3213
3214         /* Set the clip region because Xft is sometimes dirty. */
3215         r.x = 0;
3216         r.y = 0;
3217         r.height = xw.ch;
3218         r.width = width;
3219         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3220
3221         for(xp = winx; bytelen > 0;) {
3222                 /*
3223                  * Search for the range in the to be printed string of glyphs
3224                  * that are in the main font. Then print that range. If
3225                  * some glyph is found that is not in the font, do the
3226                  * fallback dance.
3227                  */
3228                 u8fs = s;
3229                 u8fblen = 0;
3230                 u8fl = 0;
3231                 oneatatime = font->width != xw.cw;
3232                 for(;;) {
3233                         u8c = s;
3234                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3235                         s += u8cblen;
3236                         bytelen -= u8cblen;
3237
3238                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3239                         if(oneatatime || !doesexist || bytelen <= 0) {
3240                                 if(oneatatime || bytelen <= 0) {
3241                                         if(doesexist) {
3242                                                 u8fl++;
3243                                                 u8fblen += u8cblen;
3244                                         }
3245                                 }
3246
3247                                 if(u8fl > 0) {
3248                                         XftDrawStringUtf8(xw.draw, fg,
3249                                                         font->match, xp,
3250                                                         winy + font->ascent,
3251                                                         (FcChar8 *)u8fs,
3252                                                         u8fblen);
3253                                         xp += xw.cw * u8fl;
3254
3255                                 }
3256                                 break;
3257                         }
3258
3259                         u8fl++;
3260                         u8fblen += u8cblen;
3261                 }
3262                 if(doesexist) {
3263                         if(oneatatime)
3264                                 continue;
3265                         break;
3266                 }
3267
3268                 /* Search the font cache. */
3269                 for(i = 0; i < frclen; i++) {
3270                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3271                                         && frc[i].flags == frcflags) {
3272                                 break;
3273                         }
3274                 }
3275
3276                 /* Nothing was found. */
3277                 if(i >= frclen) {
3278                         if(!font->set)
3279                                 xloadfontset(font);
3280                         fcsets[0] = font->set;
3281
3282                         /*
3283                          * Nothing was found in the cache. Now use
3284                          * some dozen of Fontconfig calls to get the
3285                          * font for one single character.
3286                          *
3287                          * Xft and fontconfig are design failures.
3288                          */
3289                         fcpattern = FcPatternDuplicate(font->pattern);
3290                         fccharset = FcCharSetCreate();
3291
3292                         FcCharSetAddChar(fccharset, unicodep);
3293                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3294                                         fccharset);
3295                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3296                                         FcTrue);
3297
3298                         FcConfigSubstitute(0, fcpattern,
3299                                         FcMatchPattern);
3300                         FcDefaultSubstitute(fcpattern);
3301
3302                         fontpattern = FcFontSetMatch(0, fcsets,
3303                                         FcTrue, fcpattern, &fcres);
3304
3305                         /*
3306                          * Overwrite or create the new cache entry.
3307                          */
3308                         if(frclen >= LEN(frc)) {
3309                                 frclen = LEN(frc) - 1;
3310                                 XftFontClose(xw.dpy, frc[frclen].font);
3311                         }
3312
3313                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3314                                         fontpattern);
3315                         frc[frclen].flags = frcflags;
3316
3317                         i = frclen;
3318                         frclen++;
3319
3320                         FcPatternDestroy(fcpattern);
3321                         FcCharSetDestroy(fccharset);
3322                 }
3323
3324                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3325                                 xp, winy + frc[i].font->ascent,
3326                                 (FcChar8 *)u8c, u8cblen);
3327
3328                 xp += xw.cw * wcwidth(unicodep);
3329         }
3330
3331         /*
3332          * This is how the loop above actually should be. Why does the
3333          * application have to care about font details?
3334          *
3335          * I have to repeat: Xft and Fontconfig are design failures.
3336          */
3337         /*
3338         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3339                         winy + font->ascent, (FcChar8 *)s, bytelen);
3340         */
3341
3342         if(base.mode & ATTR_UNDERLINE) {
3343                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3344                                 width, 1);
3345         }
3346
3347         /* Reset clip to none. */
3348         XftDrawSetClip(xw.draw, 0);
3349 }
3350
3351 void
3352 xdrawcursor(void) {
3353         static int oldx = 0, oldy = 0;
3354         int sl, width, curx;
3355         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3356
3357         LIMIT(oldx, 0, term.col-1);
3358         LIMIT(oldy, 0, term.row-1);
3359
3360         curx = term.c.x;
3361
3362         /* adjust position if in dummy */
3363         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3364                 oldx--;
3365         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3366                 curx--;
3367
3368         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3369
3370         /* remove the old cursor */
3371         sl = utf8len(term.line[oldy][oldx].c);
3372         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3373         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3374                         oldy, width, sl);
3375
3376         /* draw the new one */
3377         if(!(IS_SET(MODE_HIDE))) {
3378                 if(xw.state & WIN_FOCUSED) {
3379                         if(IS_SET(MODE_REVERSE)) {
3380                                 g.mode |= ATTR_REVERSE;
3381                                 g.fg = defaultcs;
3382                                 g.bg = defaultfg;
3383                         }
3384
3385                         sl = utf8len(g.c);
3386                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3387                                 ? 2 : 1;
3388                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3389                 } else {
3390                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3391                                         borderpx + curx * xw.cw,
3392                                         borderpx + term.c.y * xw.ch,
3393                                         xw.cw - 1, 1);
3394                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3395                                         borderpx + curx * xw.cw,
3396                                         borderpx + term.c.y * xw.ch,
3397                                         1, xw.ch - 1);
3398                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3399                                         borderpx + (curx + 1) * xw.cw - 1,
3400                                         borderpx + term.c.y * xw.ch,
3401                                         1, xw.ch - 1);
3402                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3403                                         borderpx + curx * xw.cw,
3404                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3405                                         xw.cw, 1);
3406                 }
3407                 oldx = curx, oldy = term.c.y;
3408         }
3409 }
3410
3411
3412 void
3413 xsettitle(char *p) {
3414         XTextProperty prop;
3415
3416         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3417                         &prop);
3418         XSetWMName(xw.dpy, xw.win, &prop);
3419         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3420         XFree(prop.value);
3421 }
3422
3423 void
3424 xresettitle(void) {
3425         xsettitle(opt_title ? opt_title : "st");
3426 }
3427
3428 void
3429 redraw(int timeout) {
3430         struct timespec tv = {0, timeout * 1000};
3431
3432         draw();
3433
3434         if(timeout > 0) {
3435                 nanosleep(&tv, NULL);
3436                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3437         }
3438 }
3439
3440 void
3441 draw(void) {
3442         drawregion(0, 0, term.col, term.row);
3443         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3444                         xw.h, 0, 0);
3445         XSetForeground(xw.dpy, dc.gc,
3446                         dc.col[IS_SET(MODE_REVERSE)?
3447                                 defaultfg : defaultbg].pixel);
3448 }
3449
3450 void
3451 drawregion(int x1, int y1, int x2, int y2) {
3452         int ic, ib, x, y, ox, sl;
3453         Glyph base, new;
3454         char buf[DRAW_BUF_SIZ];
3455         bool ena_sel = sel.ob.x != -1;
3456         long unicodep;
3457
3458         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3459                 ena_sel = 0;
3460
3461         if(!(xw.state & WIN_VISIBLE))
3462                 return;
3463
3464         for(y = y1; y < y2; y++) {
3465                 if(!term.dirty[y])
3466                         continue;
3467
3468                 xtermclear(0, y, term.col, y);
3469                 term.dirty[y] = 0;
3470                 base = term.line[y][0];
3471                 ic = ib = ox = 0;
3472                 for(x = x1; x < x2; x++) {
3473                         new = term.line[y][x];
3474                         if(new.mode == ATTR_WDUMMY)
3475                                 continue;
3476                         if(ena_sel && selected(x, y))
3477                                 new.mode ^= ATTR_REVERSE;
3478                         if(ib > 0 && (ATTRCMP(base, new)
3479                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3480                                 xdraws(buf, base, ox, y, ic, ib);
3481                                 ic = ib = 0;
3482                         }
3483                         if(ib == 0) {
3484                                 ox = x;
3485                                 base = new;
3486                         }
3487
3488                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3489                         memcpy(buf+ib, new.c, sl);
3490                         ib += sl;
3491                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3492                 }
3493                 if(ib > 0)
3494                         xdraws(buf, base, ox, y, ic, ib);
3495         }
3496         xdrawcursor();
3497 }
3498
3499 void
3500 expose(XEvent *ev) {
3501         XExposeEvent *e = &ev->xexpose;
3502
3503         if(xw.state & WIN_REDRAW) {
3504                 if(!e->count)
3505                         xw.state &= ~WIN_REDRAW;
3506         }
3507         redraw(0);
3508 }
3509
3510 void
3511 visibility(XEvent *ev) {
3512         XVisibilityEvent *e = &ev->xvisibility;
3513
3514         if(e->state == VisibilityFullyObscured) {
3515                 xw.state &= ~WIN_VISIBLE;
3516         } else if(!(xw.state & WIN_VISIBLE)) {
3517                 /* need a full redraw for next Expose, not just a buf copy */
3518                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3519         }
3520 }
3521
3522 void
3523 unmap(XEvent *ev) {
3524         xw.state &= ~WIN_VISIBLE;
3525 }
3526
3527 void
3528 xsetpointermotion(int set) {
3529         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3530         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3531 }
3532
3533 void
3534 xseturgency(int add) {
3535         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3536
3537         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3538         XSetWMHints(xw.dpy, xw.win, h);
3539         XFree(h);
3540 }
3541
3542 void
3543 focus(XEvent *ev) {
3544         XFocusChangeEvent *e = &ev->xfocus;
3545
3546         if(e->mode == NotifyGrab)
3547                 return;
3548
3549         if(ev->type == FocusIn) {
3550                 XSetICFocus(xw.xic);
3551                 xw.state |= WIN_FOCUSED;
3552                 xseturgency(0);
3553                 if(IS_SET(MODE_FOCUS))
3554                         ttywrite("\033[I", 3);
3555         } else {
3556                 XUnsetICFocus(xw.xic);
3557                 xw.state &= ~WIN_FOCUSED;
3558                 if(IS_SET(MODE_FOCUS))
3559                         ttywrite("\033[O", 3);
3560         }
3561 }
3562
3563 static inline bool
3564 match(uint mask, uint state) {
3565         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3566 }
3567
3568 void
3569 numlock(const Arg *dummy) {
3570         term.numlock ^= 1;
3571 }
3572
3573 char*
3574 kmap(KeySym k, uint state) {
3575         Key *kp;
3576         int i;
3577
3578         /* Check for mapped keys out of X11 function keys. */
3579         for(i = 0; i < LEN(mappedkeys); i++) {
3580                 if(mappedkeys[i] == k)
3581                         break;
3582         }
3583         if(i == LEN(mappedkeys)) {
3584                 if((k & 0xFFFF) < 0xFD00)
3585                         return NULL;
3586         }
3587
3588         for(kp = key; kp < key + LEN(key); kp++) {
3589                 if(kp->k != k)
3590                         continue;
3591
3592                 if(!match(kp->mask, state))
3593                         continue;
3594
3595                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3596                         continue;
3597                 if(term.numlock && kp->appkey == 2)
3598                         continue;
3599
3600                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3601                         continue;
3602
3603                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3604                         continue;
3605
3606                 return kp->s;
3607         }
3608
3609         return NULL;
3610 }
3611
3612 void
3613 kpress(XEvent *ev) {
3614         XKeyEvent *e = &ev->xkey;
3615         KeySym ksym;
3616         char buf[32], *customkey;
3617         int len;
3618         long c;
3619         Status status;
3620         Shortcut *bp;
3621
3622         if(IS_SET(MODE_KBDLOCK))
3623                 return;
3624
3625         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3626         /* 1. shortcuts */
3627         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3628                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3629                         bp->func(&(bp->arg));
3630                         return;
3631                 }
3632         }
3633
3634         /* 2. custom keys from config.h */
3635         if((customkey = kmap(ksym, e->state))) {
3636                 ttysend(customkey, strlen(customkey));
3637                 return;
3638         }
3639
3640         /* 3. composed string from input method */
3641         if(len == 0)
3642                 return;
3643         if(len == 1 && e->state & Mod1Mask) {
3644                 if(IS_SET(MODE_8BIT)) {
3645                         if(*buf < 0177) {
3646                                 c = *buf | 0x80;
3647                                 len = utf8encode(c, buf, UTF_SIZ);
3648                         }
3649                 } else {
3650                         buf[1] = buf[0];
3651                         buf[0] = '\033';
3652                         len = 2;
3653                 }
3654         }
3655         ttysend(buf, len);
3656 }
3657
3658
3659 void
3660 cmessage(XEvent *e) {
3661         /*
3662          * See xembed specs
3663          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3664          */
3665         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3666                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3667                         xw.state |= WIN_FOCUSED;
3668                         xseturgency(0);
3669                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3670                         xw.state &= ~WIN_FOCUSED;
3671                 }
3672         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3673                 /* Send SIGHUP to shell */
3674                 kill(pid, SIGHUP);
3675                 exit(EXIT_SUCCESS);
3676         }
3677 }
3678
3679 void
3680 cresize(int width, int height) {
3681         int col, row;
3682
3683         if(width != 0)
3684                 xw.w = width;
3685         if(height != 0)
3686                 xw.h = height;
3687
3688         col = (xw.w - 2 * borderpx) / xw.cw;
3689         row = (xw.h - 2 * borderpx) / xw.ch;
3690
3691         tresize(col, row);
3692         xresize(col, row);
3693         ttyresize();
3694 }
3695
3696 void
3697 resize(XEvent *e) {
3698         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3699                 return;
3700
3701         cresize(e->xconfigure.width, e->xconfigure.height);
3702 }
3703
3704 void
3705 run(void) {
3706         XEvent ev;
3707         int w = xw.w, h = xw.h;
3708         fd_set rfd;
3709         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3710         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3711
3712         /* Waiting for window mapping */
3713         while(1) {
3714                 XNextEvent(xw.dpy, &ev);
3715                 if(ev.type == ConfigureNotify) {
3716                         w = ev.xconfigure.width;
3717                         h = ev.xconfigure.height;
3718                 } else if(ev.type == MapNotify) {
3719                         break;
3720                 }
3721         }
3722
3723         ttynew();
3724         if(!xw.isfixed)
3725                 cresize(w, h);
3726         else
3727                 cresize(xw.fw, xw.fh);
3728
3729         gettimeofday(&last, NULL);
3730         lastblink = last;
3731
3732         for(xev = actionfps;;) {
3733                 long deltatime;
3734
3735                 FD_ZERO(&rfd);
3736                 FD_SET(cmdfd, &rfd);
3737                 FD_SET(xfd, &rfd);
3738
3739                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3740                         if(errno == EINTR)
3741                                 continue;
3742                         die("select failed: %s\n", strerror(errno));
3743                 }
3744                 if(FD_ISSET(cmdfd, &rfd)) {
3745                         ttyread();
3746                         if(blinktimeout) {
3747                                 blinkset = tattrset(ATTR_BLINK);
3748                                 if(!blinkset)
3749                                         MODBIT(term.mode, 0, MODE_BLINK);
3750                         }
3751                 }
3752
3753                 if(FD_ISSET(xfd, &rfd))
3754                         xev = actionfps;
3755
3756                 gettimeofday(&now, NULL);
3757                 drawtimeout.tv_sec = 0;
3758                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3759                 tv = &drawtimeout;
3760
3761                 dodraw = 0;
3762                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3763                         tsetdirtattr(ATTR_BLINK);
3764                         term.mode ^= MODE_BLINK;
3765                         lastblink = now;
3766                         dodraw = 1;
3767                 }
3768                 deltatime = TIMEDIFF(now, last);
3769                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3770                                 || deltatime < 0) {
3771                         dodraw = 1;
3772                         last = now;
3773                 }
3774
3775                 if(dodraw) {
3776                         while(XPending(xw.dpy)) {
3777                                 XNextEvent(xw.dpy, &ev);
3778                                 if(XFilterEvent(&ev, None))
3779                                         continue;
3780                                 if(handler[ev.type])
3781                                         (handler[ev.type])(&ev);
3782                         }
3783
3784                         draw();
3785                         XFlush(xw.dpy);
3786
3787                         if(xev && !FD_ISSET(xfd, &rfd))
3788                                 xev--;
3789                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3790                                 if(blinkset) {
3791                                         if(TIMEDIFF(now, lastblink) \
3792                                                         > blinktimeout) {
3793                                                 drawtimeout.tv_usec = 1;
3794                                         } else {
3795                                                 drawtimeout.tv_usec = (1000 * \
3796                                                         (blinktimeout - \
3797                                                         TIMEDIFF(now,
3798                                                                 lastblink)));
3799                                         }
3800                                 } else {
3801                                         tv = NULL;
3802                                 }
3803                         }
3804                 }
3805         }
3806 }
3807
3808 void
3809 usage(void) {
3810         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3811         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3812         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3813 }
3814
3815 int
3816 main(int argc, char *argv[]) {
3817         int bitm, xr, yr;
3818         uint wr, hr;
3819         char *titles;
3820
3821         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3822         xw.isfixed = False;
3823
3824         ARGBEGIN {
3825         case 'a':
3826                 allowaltscreen = false;
3827                 break;
3828         case 'c':
3829                 opt_class = EARGF(usage());
3830                 break;
3831         case 'e':
3832                 /* eat all remaining arguments */
3833                 if(argc > 1) {
3834                         opt_cmd = &argv[1];
3835                         if(argv[1] != NULL && opt_title == NULL) {
3836                                 titles = xstrdup(argv[1]);
3837                                 opt_title = basename(titles);
3838                         }
3839                 }
3840                 goto run;
3841         case 'f':
3842                 opt_font = EARGF(usage());
3843                 break;
3844         case 'g':
3845                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3846                 if(bitm & XValue)
3847                         xw.fx = xr;
3848                 if(bitm & YValue)
3849                         xw.fy = yr;
3850                 if(bitm & WidthValue)
3851                         xw.fw = (int)wr;
3852                 if(bitm & HeightValue)
3853                         xw.fh = (int)hr;
3854                 if(bitm & XNegative && xw.fx == 0)
3855                         xw.fx = -1;
3856                 if(bitm & YNegative && xw.fy == 0)
3857                         xw.fy = -1;
3858
3859                 if(xw.fh != 0 && xw.fw != 0)
3860                         xw.isfixed = True;
3861                 break;
3862         case 'o':
3863                 opt_io = EARGF(usage());
3864                 break;
3865         case 't':
3866                 opt_title = EARGF(usage());
3867                 break;
3868         case 'w':
3869                 opt_embed = EARGF(usage());
3870                 break;
3871         case 'v':
3872         default:
3873                 usage();
3874         } ARGEND;
3875
3876 run:
3877         setlocale(LC_CTYPE, "");
3878         XSetLocaleModifiers("");
3879         tnew(80, 24);
3880         xinit();
3881         selinit();
3882         run();
3883
3884         return 0;
3885 }
3886