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 ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  80 #define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
  81 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  82
  83 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  84 #define IS_TRUECOL(x)    (1 << 24 & (x))
  85 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  86 #define TRUEGREEN(x)     (((x) & 0xff00))
  87 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  88
  89
  90 #define VT102ID "\033[?6c"
  91
  92 enum glyph_attribute {
  93         ATTR_NULL      = 0,
  94         ATTR_REVERSE   = 1,
  95         ATTR_UNDERLINE = 2,
  96         ATTR_BOLD      = 4,
  97         ATTR_ITALIC    = 8,
  98         ATTR_BLINK     = 16,
  99         ATTR_WRAP      = 32,
 100         ATTR_WIDE      = 64,
 101         ATTR_WDUMMY    = 128,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1,
 117         MODE_INSERT      = 2,
 118         MODE_APPKEYPAD   = 4,
 119         MODE_ALTSCREEN   = 8,
 120         MODE_CRLF        = 16,
 121         MODE_MOUSEBTN    = 32,
 122         MODE_MOUSEMOTION = 64,
 123         MODE_REVERSE     = 128,
 124         MODE_KBDLOCK     = 256,
 125         MODE_HIDE        = 512,
 126         MODE_ECHO        = 1024,
 127         MODE_APPCURSOR   = 2048,
 128         MODE_MOUSESGR    = 4096,
 129         MODE_8BIT        = 8192,
 130         MODE_BLINK       = 16384,
 131         MODE_FBLINK      = 32768,
 132         MODE_FOCUS       = 65536,
 133         MODE_MOUSEX10    = 131072,
 134         MODE_MOUSEMANY   = 262144,
 135         MODE_BRCKTPASTE  = 524288,
 136         MODE_PRINT       = 1048576,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Colour;
 183 typedef Colormap Colourmap;
 184
 185 typedef struct {
 186         char c[UTF_SIZ]; /* character code */
 187         ushort mode;      /* attribute flags */
 188         uint32_t fg;      /* foreground  */
 189         uint32_t bg;      /* background  */
 190 } Glyph;
 191
 192 typedef Glyph *Line;
 193
 194 typedef struct {
 195         Glyph attr; /* current char attributes */
 196         int x;
 197         int y;
 198         char state;
 199 } TCursor;
 200
 201 /* CSI Escape sequence structs */
 202 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 203 typedef struct {
 204         char buf[ESC_BUF_SIZ]; /* raw string */
 205         int len;               /* raw string length */
 206         char priv;
 207         int arg[ESC_ARG_SIZ];
 208         int narg;              /* nb of args */
 209         char mode;
 210 } CSIEscape;
 211
 212 /* STR Escape sequence structs */
 213 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 214 typedef struct {
 215         char type;             /* ESC type ... */
 216         char buf[STR_BUF_SIZ]; /* raw string */
 217         int len;               /* raw string length */
 218         char *args[STR_ARG_SIZ];
 219         int narg;              /* nb of args */
 220 } STREscape;
 221
 222 /* Internal representation of the screen */
 223 typedef struct {
 224         int row;      /* nb row */
 225         int col;      /* nb col */
 226         Line *line;   /* screen */
 227         Line *alt;    /* alternate screen */
 228         bool *dirty;  /* dirtyness of lines */
 229         TCursor c;    /* cursor */
 230         int top;      /* top    scroll limit */
 231         int bot;      /* bottom scroll limit */
 232         int mode;     /* terminal mode flags */
 233         int esc;      /* escape state flags */
 234         char trantbl[4]; /* charset table translation */
 235         int charset;  /* current charset */
 236         int icharset; /* selected charset for sequence */
 237         bool numlock; /* lock numbers in keyboard */
 238         bool *tabs;
 239 } Term;
 240
 241 /* Purely graphic info */
 242 typedef struct {
 243         Display *dpy;
 244         Colourmap cmap;
 245         Window win;
 246         Drawable buf;
 247         Atom xembed, wmdeletewin, netwmname, netwmpid;
 248         XIM xim;
 249         XIC xic;
 250         Draw draw;
 251         Visual *vis;
 252         XSetWindowAttributes attrs;
 253         int scr;
 254         bool isfixed; /* is fixed geometry? */
 255         int l, t; /* left and top offset */
 256         int gm; /* geometry mask */
 257         int tw, th; /* tty width and height */
 258         int w, h; /* window width and height */
 259         int ch; /* char height */
 260         int cw; /* char width  */
 261         char state; /* focus, redraw, visible */
 262 } XWindow;
 263
 264 typedef struct {
 265         uint b;
 266         uint mask;
 267         char *s;
 268 } Mousekey;
 269
 270 typedef struct {
 271         KeySym k;
 272         uint mask;
 273         char *s;
 274         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 275         signed char appkey;    /* application keypad */
 276         signed char appcursor; /* application cursor */
 277         signed char crlf;      /* crlf mode          */
 278 } Key;
 279
 280 typedef struct {
 281         int mode;
 282         int type;
 283         int snap;
 284         /*
 285          * Selection variables:
 286          * nb – normalized coordinates of the beginning of the selection
 287          * ne – normalized coordinates of the end of the selection
 288          * ob – original coordinates of the beginning of the selection
 289          * oe – original coordinates of the end of the selection
 290          */
 291         struct {
 292                 int x, y;
 293         } nb, ne, ob, oe;
 294
 295         char *clip;
 296         Atom xtarget;
 297         bool alt;
 298         struct timeval tclick1;
 299         struct timeval tclick2;
 300 } Selection;
 301
 302 typedef union {
 303         int i;
 304         uint ui;
 305         float f;
 306         const void *v;
 307 } Arg;
 308
 309 typedef struct {
 310         uint mod;
 311         KeySym keysym;
 312         void (*func)(const Arg *);
 313         const Arg arg;
 314 } Shortcut;
 315
 316 /* function definitions used in config.h */
 317 static void clippaste(const Arg *);
 318 static void numlock(const Arg *);
 319 static void selpaste(const Arg *);
 320 static void xzoom(const Arg *);
 321 static void printsel(const Arg *);
 322 static void printscreen(const Arg *) ;
 323 static void toggleprinter(const Arg *);
 324
 325 /* Config.h for applying patches and the configuration. */
 326 #include "config.h"
 327
 328 /* Font structure */
 329 typedef struct {
 330         int height;
 331         int width;
 332         int ascent;
 333         int descent;
 334         short lbearing;
 335         short rbearing;
 336         XftFont *match;
 337         FcFontSet *set;
 338         FcPattern *pattern;
 339 } Font;
 340
 341 /* Drawing Context */
 342 typedef struct {
 343         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 344         Font font, bfont, ifont, ibfont;
 345         GC gc;
 346 } DC;
 347
 348 static void die(const char *, ...);
 349 static void draw(void);
 350 static void redraw(int);
 351 static void drawregion(int, int, int, int);
 352 static void execsh(void);
 353 static void sigchld(int);
 354 static void run(void);
 355
 356 static void csidump(void);
 357 static void csihandle(void);
 358 static void csiparse(void);
 359 static void csireset(void);
 360 static void strdump(void);
 361 static void strhandle(void);
 362 static void strparse(void);
 363 static void strreset(void);
 364
 365 static int tattrset(int);
 366 static void tprinter(char *, size_t);
 367 static void tdumpsel(void);
 368 static void tdumpline(int);
 369 static void tdump(void);
 370 static void tclearregion(int, int, int, int);
 371 static void tcursor(int);
 372 static void tdeletechar(int);
 373 static void tdeleteline(int);
 374 static void tinsertblank(int);
 375 static void tinsertblankline(int);
 376 static void tmoveto(int, int);
 377 static void tmoveato(int, int);
 378 static void tnew(int, int);
 379 static void tnewline(int);
 380 static void tputtab(int);
 381 static void tputc(char *, int);
 382 static void treset(void);
 383 static int tresize(int, int);
 384 static void tscrollup(int, int);
 385 static void tscrolldown(int, int);
 386 static void tsetattr(int *, int);
 387 static void tsetchar(char *, Glyph *, int, int);
 388 static void tsetscroll(int, int);
 389 static void tswapscreen(void);
 390 static void tsetdirt(int, int);
 391 static void tsetdirtattr(int);
 392 static void tsetmode(bool, bool, int *, int);
 393 static void tfulldirt(void);
 394 static void techo(char *, int);
 395 static bool tcontrolcode(uchar );
 396 static void tdectest(char );
 397 static int32_t tdefcolor(int *, int *, int);
 398 static void tdeftran(char);
 399 static inline bool match(uint, uint);
 400 static void ttynew(void);
 401 static void ttyread(void);
 402 static void ttyresize(void);
 403 static void ttysend(char *, size_t);
 404 static void ttywrite(const char *, size_t);
 405
 406 static void xdraws(char *, Glyph, int, int, int, int);
 407 static void xhints(void);
 408 static void xclear(int, int, int, int);
 409 static void xdrawcursor(void);
 410 static void xinit(void);
 411 static void xloadcols(void);
 412 static int xsetcolorname(int, const char *);
 413 static int xgeommasktogravity(int);
 414 static int xloadfont(Font *, FcPattern *);
 415 static void xloadfonts(char *, double);
 416 static int xloadfontset(Font *);
 417 static void xsettitle(char *);
 418 static void xresettitle(void);
 419 static void xsetpointermotion(int);
 420 static void xseturgency(int);
 421 static void xsetsel(char *);
 422 static void xtermclear(int, int, int, int);
 423 static void xunloadfont(Font *);
 424 static void xunloadfonts(void);
 425 static void xresize(int, int);
 426
 427 static void expose(XEvent *);
 428 static void visibility(XEvent *);
 429 static void unmap(XEvent *);
 430 static char *kmap(KeySym, uint);
 431 static void kpress(XEvent *);
 432 static void cmessage(XEvent *);
 433 static void cresize(int, int);
 434 static void resize(XEvent *);
 435 static void focus(XEvent *);
 436 static void brelease(XEvent *);
 437 static void bpress(XEvent *);
 438 static void bmotion(XEvent *);
 439 static void selnotify(XEvent *);
 440 static void selclear(XEvent *);
 441 static void selrequest(XEvent *);
 442
 443 static void selinit(void);
 444 static void selsort(void);
 445 static inline bool selected(int, int);
 446 static char *getsel(void);
 447 static void selcopy(void);
 448 static void selscroll(int, int);
 449 static void selsnap(int, int *, int *, int);
 450 static void getbuttoninfo(XEvent *);
 451 static void mousereport(XEvent *);
 452
 453 static size_t utf8decode(char *, long *, size_t);
 454 static long utf8decodebyte(char, size_t *);
 455 static size_t utf8encode(long, char *, size_t);
 456 static char utf8encodebyte(long, size_t);
 457 static size_t utf8len(char *);
 458 static size_t utf8validate(long *, size_t);
 459
 460 static ssize_t xwrite(int, const char *, size_t);
 461 static void *xmalloc(size_t);
 462 static void *xrealloc(void *, size_t);
 463 static char *xstrdup(char *);
 464
 465 static void usage(void);
 466
 467 static void (*handler[LASTEvent])(XEvent *) = {
 468         [KeyPress] = kpress,
 469         [ClientMessage] = cmessage,
 470         [ConfigureNotify] = resize,
 471         [VisibilityNotify] = visibility,
 472         [UnmapNotify] = unmap,
 473         [Expose] = expose,
 474         [FocusIn] = focus,
 475         [FocusOut] = focus,
 476         [MotionNotify] = bmotion,
 477         [ButtonPress] = bpress,
 478         [ButtonRelease] = brelease,
 479         [SelectionClear] = selclear,
 480         [SelectionNotify] = selnotify,
 481         [SelectionRequest] = selrequest,
 482 };
 483
 484 /* Globals */
 485 static DC dc;
 486 static XWindow xw;
 487 static Term term;
 488 static CSIEscape csiescseq;
 489 static STREscape strescseq;
 490 static int cmdfd;
 491 static pid_t pid;
 492 static Selection sel;
 493 static int iofd = STDOUT_FILENO;
 494 static char **opt_cmd = NULL;
 495 static char *opt_io = NULL;
 496 static char *opt_title = NULL;
 497 static char *opt_embed = NULL;
 498 static char *opt_class = NULL;
 499 static char *opt_font = NULL;
 500 static int oldbutton = 3; /* button event on startup: 3 = release */
 501
 502 static char *usedfont = NULL;
 503 static double usedfontsize = 0;
 504
 505 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 506 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 507 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 508 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 509
 510 /* Font Ring Cache */
 511 enum {
 512         FRC_NORMAL,
 513         FRC_ITALIC,
 514         FRC_BOLD,
 515         FRC_ITALICBOLD
 516 };
 517
 518 typedef struct {
 519         XftFont *font;
 520         int flags;
 521 } Fontcache;
 522
 523 /* Fontcache is an array now. A new font will be appended to the array. */
 524 static Fontcache frc[16];
 525 static int frclen = 0;
 526
 527 ssize_t
 528 xwrite(int fd, const char *s, size_t len) {
 529         size_t aux = len;
 530
 531         while(len > 0) {
 532                 ssize_t r = write(fd, s, len);
 533                 if(r < 0)
 534                         return r;
 535                 len -= r;
 536                 s += r;
 537         }
 538         return aux;
 539 }
 540
 541 void *
 542 xmalloc(size_t len) {
 543         void *p = malloc(len);
 544
 545         if(!p)
 546                 die("Out of memory\n");
 547
 548         return p;
 549 }
 550
 551 void *
 552 xrealloc(void *p, size_t len) {
 553         if((p = realloc(p, len)) == NULL)
 554                 die("Out of memory\n");
 555
 556         return p;
 557 }
 558
 559 char *
 560 xstrdup(char *s) {
 561         if((s = strdup(s)) == NULL)
 562                 die("Out of memory\n");
 563
 564         return s;
 565 }
 566
 567 size_t
 568 utf8decode(char *c, long *u, size_t clen) {
 569         size_t i, j, len, type;
 570         long udecoded;
 571
 572         *u = UTF_INVALID;
 573         if(!clen)
 574                 return 0;
 575         udecoded = utf8decodebyte(c[0], &len);
 576         if(!BETWEEN(len, 1, UTF_SIZ))
 577                 return 1;
 578         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 579                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 580                 if(type != 0)
 581                         return j;
 582         }
 583         if(j < len)
 584                 return 0;
 585         *u = udecoded;
 586         utf8validate(u, len);
 587         return len;
 588 }
 589
 590 long
 591 utf8decodebyte(char c, size_t *i) {
 592         for(*i = 0; *i < LEN(utfmask); ++(*i))
 593                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 594                         return (uchar)c & ~utfmask[*i];
 595         return 0;
 596 }
 597
 598 size_t
 599 utf8encode(long u, char *c, size_t clen) {
 600         size_t len, i;
 601
 602         len = utf8validate(&u, 0);
 603         if(clen < len)
 604                 return 0;
 605         for(i = len - 1; i != 0; --i) {
 606                 c[i] = utf8encodebyte(u, 0);
 607                 u >>= 6;
 608         }
 609         c[0] = utf8encodebyte(u, len);
 610         return len;
 611 }
 612
 613 char
 614 utf8encodebyte(long u, size_t i) {
 615         return utfbyte[i] | (u & ~utfmask[i]);
 616 }
 617
 618 size_t
 619 utf8len(char *c) {
 620         return utf8decode(c, &(long){0}, UTF_SIZ);
 621 }
 622
 623 size_t
 624 utf8validate(long *u, size_t i) {
 625         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 626                 *u = UTF_INVALID;
 627         for(i = 1; *u > utfmax[i]; ++i)
 628                 ;
 629         return i;
 630 }
 631
 632 static void
 633 selinit(void) {
 634         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 635         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 636         sel.mode = 0;
 637         sel.ob.x = -1;
 638         sel.clip = NULL;
 639         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 640         if(sel.xtarget == None)
 641                 sel.xtarget = XA_STRING;
 642 }
 643
 644 static int
 645 x2col(int x) {
 646         x -= borderpx;
 647         x /= xw.cw;
 648
 649         return LIMIT(x, 0, term.col-1);
 650 }
 651
 652 static int
 653 y2row(int y) {
 654         y -= borderpx;
 655         y /= xw.ch;
 656
 657         return LIMIT(y, 0, term.row-1);
 658 }
 659
 660 static void
 661 selsort(void) {
 662         if(sel.ob.y == sel.oe.y) {
 663                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 664                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 665         } else {
 666                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 667                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 668         }
 669         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 670         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 671 }
 672
 673 static inline bool
 674 selected(int x, int y) {
 675         if(sel.type == SEL_RECTANGULAR)
 676                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 677                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 678
 679         return BETWEEN(y, sel.nb.y, sel.ne.y)
 680             && (y != sel.nb.y || x >= sel.nb.x)
 681             && (y != sel.ne.y || x <= sel.ne.x);
 682 }
 683
 684 void
 685 selsnap(int mode, int *x, int *y, int direction) {
 686         int i;
 687
 688         switch(mode) {
 689         case SNAP_WORD:
 690                 /*
 691                  * Snap around if the word wraps around at the end or
 692                  * beginning of a line.
 693                  */
 694                 for(;;) {
 695                         if(direction < 0 && *x <= 0) {
 696                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 697                                                 & ATTR_WRAP) {
 698                                         *y -= 1;
 699                                         *x = term.col-1;
 700                                 } else {
 701                                         break;
 702                                 }
 703                         }
 704                         if(direction > 0 && *x >= term.col-1) {
 705                                 if(*y < term.row-1 && term.line[*y][*x].mode
 706                                                 & ATTR_WRAP) {
 707                                         *y += 1;
 708                                         *x = 0;
 709                                 } else {
 710                                         break;
 711                                 }
 712                         }
 713
 714                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 715                                 *x += direction;
 716                                 continue;
 717                         }
 718
 719                         if(strchr(worddelimiters,
 720                                         term.line[*y][*x+direction].c[0])) {
 721                                 break;
 722                         }
 723
 724                         *x += direction;
 725                 }
 726                 break;
 727         case SNAP_LINE:
 728                 /*
 729                  * Snap around if the the previous line or the current one
 730                  * has set ATTR_WRAP at its end. Then the whole next or
 731                  * previous line will be selected.
 732                  */
 733                 *x = (direction < 0) ? 0 : term.col - 1;
 734                 if(direction < 0 && *y > 0) {
 735                         for(; *y > 0; *y += direction) {
 736                                 if(!(term.line[*y-1][term.col-1].mode
 737                                                 & ATTR_WRAP)) {
 738                                         break;
 739                                 }
 740                         }
 741                 } else if(direction > 0 && *y < term.row-1) {
 742                         for(; *y < term.row; *y += direction) {
 743                                 if(!(term.line[*y][term.col-1].mode
 744                                                 & ATTR_WRAP)) {
 745                                         break;
 746                                 }
 747                         }
 748                 }
 749                 break;
 750         default:
 751                 /*
 752                  * Select the whole line when the end of line is reached.
 753                  */
 754                 if(direction > 0) {
 755                         i = term.col;
 756                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 757                                 /* nothing */;
 758                         if(i > 0 && i < *x)
 759                                 *x = term.col - 1;
 760                 }
 761                 break;
 762         }
 763 }
 764
 765 void
 766 getbuttoninfo(XEvent *e) {
 767         int type;
 768         uint state = e->xbutton.state &~Button1Mask;
 769
 770         sel.alt = IS_SET(MODE_ALTSCREEN);
 771
 772         sel.oe.x = x2col(e->xbutton.x);
 773         sel.oe.y = y2row(e->xbutton.y);
 774
 775         if(sel.ob.y < sel.oe.y
 776                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 777                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 778                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 779         } else {
 780                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 781                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 782         }
 783         selsort();
 784
 785         sel.type = SEL_REGULAR;
 786         for(type = 1; type < LEN(selmasks); ++type) {
 787                 if(match(selmasks[type], state)) {
 788                         sel.type = type;
 789                         break;
 790                 }
 791         }
 792 }
 793
 794 void
 795 mousereport(XEvent *e) {
 796         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 797             button = e->xbutton.button, state = e->xbutton.state,
 798             len;
 799         char buf[40];
 800         static int ox, oy;
 801
 802         /* from urxvt */
 803         if(e->xbutton.type == MotionNotify) {
 804                 if(x == ox && y == oy)
 805                         return;
 806                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 807                         return;
 808                 /* MOUSE_MOTION: no reporting if no button is pressed */
 809                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 810                         return;
 811
 812                 button = oldbutton + 32;
 813                 ox = x;
 814                 oy = y;
 815         } else {
 816                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 817                         button = 3;
 818                 } else {
 819                         button -= Button1;
 820                         if(button >= 3)
 821                                 button += 64 - 3;
 822                 }
 823                 if(e->xbutton.type == ButtonPress) {
 824                         oldbutton = button;
 825                         ox = x;
 826                         oy = y;
 827                 } else if(e->xbutton.type == ButtonRelease) {
 828                         oldbutton = 3;
 829                         /* MODE_MOUSEX10: no button release reporting */
 830                         if(IS_SET(MODE_MOUSEX10))
 831                                 return;
 832                 }
 833         }
 834
 835         if(!IS_SET(MODE_MOUSEX10)) {
 836                 button += (state & ShiftMask   ? 4  : 0)
 837                         + (state & Mod4Mask    ? 8  : 0)
 838                         + (state & ControlMask ? 16 : 0);
 839         }
 840
 841         len = 0;
 842         if(IS_SET(MODE_MOUSESGR)) {
 843                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 844                                 button, x+1, y+1,
 845                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 846         } else if(x < 223 && y < 223) {
 847                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 848                                 32+button, 32+x+1, 32+y+1);
 849         } else {
 850                 return;
 851         }
 852
 853         ttywrite(buf, len);
 854 }
 855
 856 void
 857 bpress(XEvent *e) {
 858         struct timeval now;
 859         Mousekey *mk;
 860
 861         if(IS_SET(MODE_MOUSE)) {
 862                 mousereport(e);
 863                 return;
 864         }
 865
 866         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 867                 if(e->xbutton.button == mk->b
 868                                 && match(mk->mask, e->xbutton.state)) {
 869                         ttysend(mk->s, strlen(mk->s));
 870                         return;
 871                 }
 872         }
 873
 874         if(e->xbutton.button == Button1) {
 875                 gettimeofday(&now, NULL);
 876
 877                 /* Clear previous selection, logically and visually. */
 878                 selclear(NULL);
 879                 sel.mode = 1;
 880                 sel.type = SEL_REGULAR;
 881                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 882                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 883
 884                 /*
 885                  * If the user clicks below predefined timeouts specific
 886                  * snapping behaviour is exposed.
 887                  */
 888                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 889                         sel.snap = SNAP_LINE;
 890                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 891                         sel.snap = SNAP_WORD;
 892                 } else {
 893                         sel.snap = 0;
 894                 }
 895                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 896                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 897                 selsort();
 898
 899                 /*
 900                  * Draw selection, unless it's regular and we don't want to
 901                  * make clicks visible
 902                  */
 903                 if(sel.snap != 0) {
 904                         sel.mode++;
 905                         tsetdirt(sel.nb.y, sel.ne.y);
 906                 }
 907                 sel.tclick2 = sel.tclick1;
 908                 sel.tclick1 = now;
 909         }
 910 }
 911
 912 char *
 913 getsel(void) {
 914         char *str, *ptr;
 915         int x, y, bufsize, size, i, ex;
 916         Glyph *gp, *last;
 917
 918         if(sel.ob.x == -1)
 919                 return NULL;
 920
 921         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 922         ptr = str = xmalloc(bufsize);
 923
 924         /* append every set & selected glyph to the selection */
 925         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 926                 gp = &term.line[y][0];
 927                 last = &gp[term.col-1];
 928
 929                 while(last >= gp && !(selected(last - gp, y) &&
 930                                       strcmp(last->c, " ") != 0)) {
 931                         --last;
 932                 }
 933
 934                 for(x = 0; gp <= last; x++, ++gp) {
 935                         if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 936                                 continue;
 937
 938                         size = utf8len(gp->c);
 939                         memcpy(ptr, gp->c, size);
 940                         ptr += size;
 941                 }
 942
 943                 /*
 944                  * Copy and pasting of line endings is inconsistent
 945                  * in the inconsistent terminal and GUI world.
 946                  * The best solution seems like to produce '\n' when
 947                  * something is copied from st and convert '\n' to
 948                  * '\r', when something to be pasted is received by
 949                  * st.
 950                  * FIXME: Fix the computer world.
 951                  */
 952                 if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
 953                         *ptr++ = '\n';
 954
 955                 /*
 956                  * If the last selected line expands in the selection
 957                  * after the visible text '\n' is appended.
 958                  */
 959                 if(y == sel.ne.y) {
 960                         i = term.col;
 961                         while(--i > 0 && term.line[y][i].c[0] == ' ')
 962                                 /* nothing */;
 963                         ex = sel.ne.x;
 964                         if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 965                                 ex = sel.nb.x;
 966                         if(i < ex)
 967                                 *ptr++ = '\n';
 968                 }
 969         }
 970         *ptr = 0;
 971         return str;
 972 }
 973
 974 void
 975 selcopy(void) {
 976         xsetsel(getsel());
 977 }
 978
 979 void
 980 selnotify(XEvent *e) {
 981         ulong nitems, ofs, rem;
 982         int format;
 983         uchar *data, *last, *repl;
 984         Atom type;
 985
 986         ofs = 0;
 987         do {
 988                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 989                                         False, AnyPropertyType, &type, &format,
 990                                         &nitems, &rem, &data)) {
 991                         fprintf(stderr, "Clipboard allocation failed\n");
 992                         return;
 993                 }
 994
 995                 /*
 996                  * As seen in getsel:
 997                  * Line endings are inconsistent in the terminal and GUI world
 998                  * copy and pasting. When receiving some selection data,
 999                  * replace all '\n' with '\r'.
1000                  * FIXME: Fix the computer world.
1001                  */
1002                 repl = data;
1003                 last = data + nitems * format / 8;
1004                 while((repl = memchr(repl, '\n', last - repl))) {
1005                         *repl++ = '\r';
1006                 }
1007
1008                 if(IS_SET(MODE_BRCKTPASTE))
1009                         ttywrite("\033[200~", 6);
1010                 ttysend((char *)data, nitems * format / 8);
1011                 if(IS_SET(MODE_BRCKTPASTE))
1012                         ttywrite("\033[201~", 6);
1013                 XFree(data);
1014                 /* number of 32-bit chunks returned */
1015                 ofs += nitems * format / 32;
1016         } while(rem > 0);
1017 }
1018
1019 void
1020 selpaste(const Arg *dummy) {
1021         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1022                         xw.win, CurrentTime);
1023 }
1024
1025 void
1026 clippaste(const Arg *dummy) {
1027         Atom clipboard;
1028
1029         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1030         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1031                         xw.win, CurrentTime);
1032 }
1033
1034 void
1035 selclear(XEvent *e) {
1036         if(sel.ob.x == -1)
1037                 return;
1038         sel.ob.x = -1;
1039         tsetdirt(sel.nb.y, sel.ne.y);
1040 }
1041
1042 void
1043 selrequest(XEvent *e) {
1044         XSelectionRequestEvent *xsre;
1045         XSelectionEvent xev;
1046         Atom xa_targets, string;
1047
1048         xsre = (XSelectionRequestEvent *) e;
1049         xev.type = SelectionNotify;
1050         xev.requestor = xsre->requestor;
1051         xev.selection = xsre->selection;
1052         xev.target = xsre->target;
1053         xev.time = xsre->time;
1054         /* reject */
1055         xev.property = None;
1056
1057         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1058         if(xsre->target == xa_targets) {
1059                 /* respond with the supported type */
1060                 string = sel.xtarget;
1061                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1062                                 XA_ATOM, 32, PropModeReplace,
1063                                 (uchar *) &string, 1);
1064                 xev.property = xsre->property;
1065         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1066                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1067                                 xsre->target, 8, PropModeReplace,
1068                                 (uchar *) sel.clip, strlen(sel.clip));
1069                 xev.property = xsre->property;
1070         }
1071
1072         /* all done, send a notification to the listener */
1073         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1074                 fprintf(stderr, "Error sending SelectionNotify event\n");
1075 }
1076
1077 void
1078 xsetsel(char *str) {
1079         /* register the selection for both the clipboard and the primary */
1080         Atom clipboard;
1081
1082         free(sel.clip);
1083         sel.clip = str;
1084
1085         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1086
1087         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1088         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1089 }
1090
1091 void
1092 brelease(XEvent *e) {
1093         if(IS_SET(MODE_MOUSE)) {
1094                 mousereport(e);
1095                 return;
1096         }
1097
1098         if(e->xbutton.button == Button2) {
1099                 selpaste(NULL);
1100         } else if(e->xbutton.button == Button1) {
1101                 if(sel.mode < 2) {
1102                         selclear(NULL);
1103                 } else {
1104                         getbuttoninfo(e);
1105                         selcopy();
1106                 }
1107                 sel.mode = 0;
1108                 tsetdirt(sel.nb.y, sel.ne.y);
1109         }
1110 }
1111
1112 void
1113 bmotion(XEvent *e) {
1114         int oldey, oldex, oldsby, oldsey;
1115
1116         if(IS_SET(MODE_MOUSE)) {
1117                 mousereport(e);
1118                 return;
1119         }
1120
1121         if(!sel.mode)
1122                 return;
1123
1124         sel.mode++;
1125         oldey = sel.oe.y;
1126         oldex = sel.oe.x;
1127         oldsby = sel.nb.y;
1128         oldsey = sel.ne.y;
1129         getbuttoninfo(e);
1130
1131         if(oldey != sel.oe.y || oldex != sel.oe.x)
1132                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1133 }
1134
1135 void
1136 die(const char *errstr, ...) {
1137         va_list ap;
1138
1139         va_start(ap, errstr);
1140         vfprintf(stderr, errstr, ap);
1141         va_end(ap);
1142         exit(EXIT_FAILURE);
1143 }
1144
1145 void
1146 execsh(void) {
1147         char **args;
1148         char *envshell = getenv("SHELL");
1149         const struct passwd *pass = getpwuid(getuid());
1150         char buf[sizeof(long) * 8 + 1];
1151
1152         unsetenv("COLUMNS");
1153         unsetenv("LINES");
1154         unsetenv("TERMCAP");
1155
1156         if(pass) {
1157                 setenv("LOGNAME", pass->pw_name, 1);
1158                 setenv("USER", pass->pw_name, 1);
1159                 setenv("SHELL", pass->pw_shell, 0);
1160                 setenv("HOME", pass->pw_dir, 0);
1161         }
1162
1163         snprintf(buf, sizeof(buf), "%lu", xw.win);
1164         setenv("WINDOWID", buf, 1);
1165
1166         signal(SIGCHLD, SIG_DFL);
1167         signal(SIGHUP, SIG_DFL);
1168         signal(SIGINT, SIG_DFL);
1169         signal(SIGQUIT, SIG_DFL);
1170         signal(SIGTERM, SIG_DFL);
1171         signal(SIGALRM, SIG_DFL);
1172
1173         DEFAULT(envshell, shell);
1174         setenv("TERM", termname, 1);
1175         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1176         execvp(args[0], args);
1177         exit(EXIT_FAILURE);
1178 }
1179
1180 void
1181 sigchld(int a) {
1182         int stat = 0;
1183
1184         if(waitpid(pid, &stat, 0) < 0)
1185                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1186
1187         if(WIFEXITED(stat)) {
1188                 exit(WEXITSTATUS(stat));
1189         } else {
1190                 exit(EXIT_FAILURE);
1191         }
1192 }
1193
1194 void
1195 ttynew(void) {
1196         int m, s;
1197         struct winsize w = {term.row, term.col, 0, 0};
1198
1199         /* seems to work fine on linux, openbsd and freebsd */
1200         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1201                 die("openpty failed: %s\n", strerror(errno));
1202
1203         switch(pid = fork()) {
1204         case -1:
1205                 die("fork failed\n");
1206                 break;
1207         case 0:
1208                 setsid(); /* create a new process group */
1209                 dup2(s, STDIN_FILENO);
1210                 dup2(s, STDOUT_FILENO);
1211                 dup2(s, STDERR_FILENO);
1212                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1213                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1214                 close(s);
1215                 close(m);
1216                 execsh();
1217                 break;
1218         default:
1219                 close(s);
1220                 cmdfd = m;
1221                 signal(SIGCHLD, sigchld);
1222                 if(opt_io) {
1223                         term.mode |= MODE_PRINT;
1224                         iofd = (!strcmp(opt_io, "-")) ?
1225                                   STDOUT_FILENO :
1226                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1227                         if(iofd < 0) {
1228                                 fprintf(stderr, "Error opening %s:%s\n",
1229                                         opt_io, strerror(errno));
1230                         }
1231                 }
1232                 break;
1233         }
1234 }
1235
1236 void
1237 ttyread(void) {
1238         static char buf[BUFSIZ];
1239         static int buflen = 0;
1240         char *ptr;
1241         char s[UTF_SIZ];
1242         int charsize; /* size of utf8 char in bytes */
1243         long unicodep;
1244         int ret;
1245
1246         /* append read bytes to unprocessed bytes */
1247         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1248                 die("Couldn't read from shell: %s\n", strerror(errno));
1249
1250         /* process every complete utf8 char */
1251         buflen += ret;
1252         ptr = buf;
1253         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1254                 utf8encode(unicodep, s, UTF_SIZ);
1255                 tputc(s, charsize);
1256                 ptr += charsize;
1257                 buflen -= charsize;
1258         }
1259
1260         /* keep any uncomplete utf8 char for the next call */
1261         memmove(buf, ptr, buflen);
1262 }
1263
1264 void
1265 ttywrite(const char *s, size_t n) {
1266         if(xwrite(cmdfd, s, n) == -1)
1267                 die("write error on tty: %s\n", strerror(errno));
1268 }
1269
1270 void
1271 ttysend(char *s, size_t n) {
1272         ttywrite(s, n);
1273         if(IS_SET(MODE_ECHO))
1274                 techo(s, n);
1275 }
1276
1277 void
1278 ttyresize(void) {
1279         struct winsize w;
1280
1281         w.ws_row = term.row;
1282         w.ws_col = term.col;
1283         w.ws_xpixel = xw.tw;
1284         w.ws_ypixel = xw.th;
1285         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1286                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1287 }
1288
1289 int
1290 tattrset(int attr) {
1291         int i, j;
1292
1293         for(i = 0; i < term.row-1; i++) {
1294                 for(j = 0; j < term.col-1; j++) {
1295                         if(term.line[i][j].mode & attr)
1296                                 return 1;
1297                 }
1298         }
1299
1300         return 0;
1301 }
1302
1303 void
1304 tsetdirt(int top, int bot) {
1305         int i;
1306
1307         LIMIT(top, 0, term.row-1);
1308         LIMIT(bot, 0, term.row-1);
1309
1310         for(i = top; i <= bot; i++)
1311                 term.dirty[i] = 1;
1312 }
1313
1314 void
1315 tsetdirtattr(int attr) {
1316         int i, j;
1317
1318         for(i = 0; i < term.row-1; i++) {
1319                 for(j = 0; j < term.col-1; j++) {
1320                         if(term.line[i][j].mode & attr) {
1321                                 tsetdirt(i, i);
1322                                 break;
1323                         }
1324                 }
1325         }
1326 }
1327
1328 void
1329 tfulldirt(void) {
1330         tsetdirt(0, term.row-1);
1331 }
1332
1333 void
1334 tcursor(int mode) {
1335         static TCursor c[2];
1336         bool alt = IS_SET(MODE_ALTSCREEN);
1337
1338         if(mode == CURSOR_SAVE) {
1339                 c[alt] = term.c;
1340         } else if(mode == CURSOR_LOAD) {
1341                 term.c = c[alt];
1342                 tmoveto(c[alt].x, c[alt].y);
1343         }
1344 }
1345
1346 void
1347 treset(void) {
1348         uint i;
1349
1350         term.c = (TCursor){{
1351                 .mode = ATTR_NULL,
1352                 .fg = defaultfg,
1353                 .bg = defaultbg
1354         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1355
1356         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1357         for(i = tabspaces; i < term.col; i += tabspaces)
1358                 term.tabs[i] = 1;
1359         term.top = 0;
1360         term.bot = term.row - 1;
1361         term.mode = MODE_WRAP;
1362         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1363         term.charset = 0;
1364
1365         tclearregion(0, 0, term.col-1, term.row-1);
1366         tmoveto(0, 0);
1367         tcursor(CURSOR_SAVE);
1368 }
1369
1370 void
1371 tnew(int col, int row) {
1372         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1373         tresize(col, row);
1374         term.numlock = 1;
1375
1376         treset();
1377 }
1378
1379 void
1380 tswapscreen(void) {
1381         Line *tmp = term.line;
1382
1383         term.line = term.alt;
1384         term.alt = tmp;
1385         term.mode ^= MODE_ALTSCREEN;
1386         tfulldirt();
1387 }
1388
1389 void
1390 tscrolldown(int orig, int n) {
1391         int i;
1392         Line temp;
1393
1394         LIMIT(n, 0, term.bot-orig+1);
1395
1396         tsetdirt(orig, term.bot-n);
1397         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1398
1399         for(i = term.bot; i >= orig+n; i--) {
1400                 temp = term.line[i];
1401                 term.line[i] = term.line[i-n];
1402                 term.line[i-n] = temp;
1403         }
1404
1405         selscroll(orig, n);
1406 }
1407
1408 void
1409 tscrollup(int orig, int n) {
1410         int i;
1411         Line temp;
1412
1413         LIMIT(n, 0, term.bot-orig+1);
1414
1415         tclearregion(0, orig, term.col-1, orig+n-1);
1416         tsetdirt(orig+n, term.bot);
1417
1418         for(i = orig; i <= term.bot-n; i++) {
1419                 temp = term.line[i];
1420                 term.line[i] = term.line[i+n];
1421                 term.line[i+n] = temp;
1422         }
1423
1424         selscroll(orig, -n);
1425 }
1426
1427 void
1428 selscroll(int orig, int n) {
1429         if(sel.ob.x == -1)
1430                 return;
1431
1432         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1433                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1434                         selclear(NULL);
1435                         return;
1436                 }
1437                 if(sel.type == SEL_RECTANGULAR) {
1438                         if(sel.ob.y < term.top)
1439                                 sel.ob.y = term.top;
1440                         if(sel.oe.y > term.bot)
1441                                 sel.oe.y = term.bot;
1442                 } else {
1443                         if(sel.ob.y < term.top) {
1444                                 sel.ob.y = term.top;
1445                                 sel.ob.x = 0;
1446                         }
1447                         if(sel.oe.y > term.bot) {
1448                                 sel.oe.y = term.bot;
1449                                 sel.oe.x = term.col;
1450                         }
1451                 }
1452                 selsort();
1453         }
1454 }
1455
1456 void
1457 tnewline(int first_col) {
1458         int y = term.c.y;
1459
1460         if(y == term.bot) {
1461                 tscrollup(term.top, 1);
1462         } else {
1463                 y++;
1464         }
1465         tmoveto(first_col ? 0 : term.c.x, y);
1466 }
1467
1468 void
1469 csiparse(void) {
1470         char *p = csiescseq.buf, *np;
1471         long int v;
1472
1473         csiescseq.narg = 0;
1474         if(*p == '?') {
1475                 csiescseq.priv = 1;
1476                 p++;
1477         }
1478
1479         csiescseq.buf[csiescseq.len] = '\0';
1480         while(p < csiescseq.buf+csiescseq.len) {
1481                 np = NULL;
1482                 v = strtol(p, &np, 10);
1483                 if(np == p)
1484                         v = 0;
1485                 if(v == LONG_MAX || v == LONG_MIN)
1486                         v = -1;
1487                 csiescseq.arg[csiescseq.narg++] = v;
1488                 p = np;
1489                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1490                         break;
1491                 p++;
1492         }
1493         csiescseq.mode = *p;
1494 }
1495
1496 /* for absolute user moves, when decom is set */
1497 void
1498 tmoveato(int x, int y) {
1499         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1500 }
1501
1502 void
1503 tmoveto(int x, int y) {
1504         int miny, maxy;
1505
1506         if(term.c.state & CURSOR_ORIGIN) {
1507                 miny = term.top;
1508                 maxy = term.bot;
1509         } else {
1510                 miny = 0;
1511                 maxy = term.row - 1;
1512         }
1513         LIMIT(x, 0, term.col-1);
1514         LIMIT(y, miny, maxy);
1515         term.c.state &= ~CURSOR_WRAPNEXT;
1516         term.c.x = x;
1517         term.c.y = y;
1518 }
1519
1520 void
1521 tsetchar(char *c, Glyph *attr, int x, int y) {
1522         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1523                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1524                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1525                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1526                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1527                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1528                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1529                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1530                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1531         };
1532
1533         /*
1534          * The table is proudly stolen from rxvt.
1535          */
1536         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1537                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1538                         c = vt100_0[c[0] - 0x41];
1539                 }
1540         }
1541
1542         if(term.line[y][x].mode & ATTR_WIDE) {
1543                 if(x+1 < term.col) {
1544                         term.line[y][x+1].c[0] = ' ';
1545                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1546                 }
1547         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1548                 term.line[y][x-1].c[0] = ' ';
1549                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1550         }
1551
1552         term.dirty[y] = 1;
1553         term.line[y][x] = *attr;
1554         memcpy(term.line[y][x].c, c, UTF_SIZ);
1555 }
1556
1557 void
1558 tclearregion(int x1, int y1, int x2, int y2) {
1559         int x, y, temp;
1560
1561         if(x1 > x2)
1562                 temp = x1, x1 = x2, x2 = temp;
1563         if(y1 > y2)
1564                 temp = y1, y1 = y2, y2 = temp;
1565
1566         LIMIT(x1, 0, term.col-1);
1567         LIMIT(x2, 0, term.col-1);
1568         LIMIT(y1, 0, term.row-1);
1569         LIMIT(y2, 0, term.row-1);
1570
1571         for(y = y1; y <= y2; y++) {
1572                 term.dirty[y] = 1;
1573                 for(x = x1; x <= x2; x++) {
1574                         if(selected(x, y))
1575                                 selclear(NULL);
1576                         term.line[y][x] = term.c.attr;
1577                         memcpy(term.line[y][x].c, " ", 2);
1578                 }
1579         }
1580 }
1581
1582 void
1583 tdeletechar(int n) {
1584         int dst, src, size;
1585         Glyph *line;
1586
1587         LIMIT(n, 0, term.col - term.c.x);
1588
1589         dst = term.c.x;
1590         src = term.c.x + n;
1591         size = term.col - src;
1592         line = term.line[term.c.y];
1593
1594         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1595         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1596 }
1597
1598 void
1599 tinsertblank(int n) {
1600         int dst, src, size;
1601         Glyph *line;
1602
1603         LIMIT(n, 0, term.col - term.c.x);
1604
1605         dst = term.c.x + n;
1606         src = term.c.x;
1607         size = term.col - dst;
1608         line = term.line[term.c.y];
1609
1610         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1611         tclearregion(src, term.c.y, dst - 1, term.c.y);
1612 }
1613
1614 void
1615 tinsertblankline(int n) {
1616         if(BETWEEN(term.c.y, term.top, term.bot))
1617                 tscrolldown(term.c.y, n);
1618 }
1619
1620 void
1621 tdeleteline(int n) {
1622         if(BETWEEN(term.c.y, term.top, term.bot))
1623                 tscrollup(term.c.y, n);
1624 }
1625
1626 int32_t
1627 tdefcolor(int *attr, int *npar, int l) {
1628         int32_t idx = -1;
1629         uint r, g, b;
1630
1631         switch (attr[*npar + 1]) {
1632         case 2: /* direct colour in RGB space */
1633                 if (*npar + 4 >= l) {
1634                         fprintf(stderr,
1635                                 "erresc(38): Incorrect number of parameters (%d)\n",
1636                                 *npar);
1637                         break;
1638                 }
1639                 r = attr[*npar + 2];
1640                 g = attr[*npar + 3];
1641                 b = attr[*npar + 4];
1642                 *npar += 4;
1643                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1644                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1645                                 r, g, b);
1646                 else
1647                         idx = TRUECOLOR(r, g, b);
1648                 break;
1649         case 5: /* indexed colour */
1650                 if (*npar + 2 >= l) {
1651                         fprintf(stderr,
1652                                 "erresc(38): Incorrect number of parameters (%d)\n",
1653                                 *npar);
1654                         break;
1655                 }
1656                 *npar += 2;
1657                 if(!BETWEEN(attr[*npar], 0, 255))
1658                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1659                 else
1660                         idx = attr[*npar];
1661                 break;
1662         case 0: /* implemented defined (only foreground) */
1663         case 1: /* transparent */
1664         case 3: /* direct colour in CMY space */
1665         case 4: /* direct colour in CMYK space */
1666         default:
1667                 fprintf(stderr,
1668                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1669                 break;
1670         }
1671
1672         return idx;
1673 }
1674
1675 void
1676 tsetattr(int *attr, int l) {
1677         int i;
1678         int32_t idx;
1679
1680         for(i = 0; i < l; i++) {
1681                 switch(attr[i]) {
1682                 case 0:
1683                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1684                                         | ATTR_BOLD | ATTR_ITALIC \
1685                                         | ATTR_BLINK);
1686                         term.c.attr.fg = defaultfg;
1687                         term.c.attr.bg = defaultbg;
1688                         break;
1689                 case 1:
1690                         term.c.attr.mode |= ATTR_BOLD;
1691                         break;
1692                 case 3:
1693                         term.c.attr.mode |= ATTR_ITALIC;
1694                         break;
1695                 case 4:
1696                         term.c.attr.mode |= ATTR_UNDERLINE;
1697                         break;
1698                 case 5: /* slow blink */
1699                 case 6: /* rapid blink */
1700                         term.c.attr.mode |= ATTR_BLINK;
1701                         break;
1702                 case 7:
1703                         term.c.attr.mode |= ATTR_REVERSE;
1704                         break;
1705                 case 21:
1706                 case 22:
1707                         term.c.attr.mode &= ~ATTR_BOLD;
1708                         break;
1709                 case 23:
1710                         term.c.attr.mode &= ~ATTR_ITALIC;
1711                         break;
1712                 case 24:
1713                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1714                         break;
1715                 case 25:
1716                 case 26:
1717                         term.c.attr.mode &= ~ATTR_BLINK;
1718                         break;
1719                 case 27:
1720                         term.c.attr.mode &= ~ATTR_REVERSE;
1721                         break;
1722                 case 38:
1723                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1724                                 term.c.attr.fg = idx;
1725                         break;
1726                 case 39:
1727                         term.c.attr.fg = defaultfg;
1728                         break;
1729                 case 48:
1730                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1731                                 term.c.attr.bg = idx;
1732                         break;
1733                 case 49:
1734                         term.c.attr.bg = defaultbg;
1735                         break;
1736                 default:
1737                         if(BETWEEN(attr[i], 30, 37)) {
1738                                 term.c.attr.fg = attr[i] - 30;
1739                         } else if(BETWEEN(attr[i], 40, 47)) {
1740                                 term.c.attr.bg = attr[i] - 40;
1741                         } else if(BETWEEN(attr[i], 90, 97)) {
1742                                 term.c.attr.fg = attr[i] - 90 + 8;
1743                         } else if(BETWEEN(attr[i], 100, 107)) {
1744                                 term.c.attr.bg = attr[i] - 100 + 8;
1745                         } else {
1746                                 fprintf(stderr,
1747                                         "erresc(default): gfx attr %d unknown\n",
1748                                         attr[i]), csidump();
1749                         }
1750                         break;
1751                 }
1752         }
1753 }
1754
1755 void
1756 tsetscroll(int t, int b) {
1757         int temp;
1758
1759         LIMIT(t, 0, term.row-1);
1760         LIMIT(b, 0, term.row-1);
1761         if(t > b) {
1762                 temp = t;
1763                 t = b;
1764                 b = temp;
1765         }
1766         term.top = t;
1767         term.bot = b;
1768 }
1769
1770 void
1771 tsetmode(bool priv, bool set, int *args, int narg) {
1772         int *lim, mode;
1773         bool alt;
1774
1775         for(lim = args + narg; args < lim; ++args) {
1776                 if(priv) {
1777                         switch(*args) {
1778                         case 1: /* DECCKM -- Cursor key */
1779                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1780                                 break;
1781                         case 5: /* DECSCNM -- Reverse video */
1782                                 mode = term.mode;
1783                                 MODBIT(term.mode, set, MODE_REVERSE);
1784                                 if(mode != term.mode)
1785                                         redraw(REDRAW_TIMEOUT);
1786                                 break;
1787                         case 6: /* DECOM -- Origin */
1788                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1789                                 tmoveato(0, 0);
1790                                 break;
1791                         case 7: /* DECAWM -- Auto wrap */
1792                                 MODBIT(term.mode, set, MODE_WRAP);
1793                                 break;
1794                         case 0:  /* Error (IGNORED) */
1795                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1796                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1797                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1798                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1799                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1800                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1801                         case 42: /* DECNRCM -- National characters (IGNORED) */
1802                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1803                                 break;
1804                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1805                                 MODBIT(term.mode, !set, MODE_HIDE);
1806                                 break;
1807                         case 9:    /* X10 mouse compatibility mode */
1808                                 xsetpointermotion(0);
1809                                 MODBIT(term.mode, 0, MODE_MOUSE);
1810                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1811                                 break;
1812                         case 1000: /* 1000: report button press */
1813                                 xsetpointermotion(0);
1814                                 MODBIT(term.mode, 0, MODE_MOUSE);
1815                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1816                                 break;
1817                         case 1002: /* 1002: report motion on button press */
1818                                 xsetpointermotion(0);
1819                                 MODBIT(term.mode, 0, MODE_MOUSE);
1820                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1821                                 break;
1822                         case 1003: /* 1003: enable all mouse motions */
1823                                 xsetpointermotion(set);
1824                                 MODBIT(term.mode, 0, MODE_MOUSE);
1825                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1826                                 break;
1827                         case 1004: /* 1004: send focus events to tty */
1828                                 MODBIT(term.mode, set, MODE_FOCUS);
1829                                 break;
1830                         case 1006: /* 1006: extended reporting mode */
1831                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1832                                 break;
1833                         case 1034:
1834                                 MODBIT(term.mode, set, MODE_8BIT);
1835                                 break;
1836                         case 1049: /* swap screen & set/restore cursor as xterm */
1837                                 if (!allowaltscreen)
1838                                         break;
1839                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1840                                 /* FALLTHRU */
1841                         case 47: /* swap screen */
1842                         case 1047:
1843                                 if (!allowaltscreen)
1844                                         break;
1845                                 alt = IS_SET(MODE_ALTSCREEN);
1846                                 if(alt) {
1847                                         tclearregion(0, 0, term.col-1,
1848                                                         term.row-1);
1849                                 }
1850                                 if(set ^ alt) /* set is always 1 or 0 */
1851                                         tswapscreen();
1852                                 if(*args != 1049)
1853                                         break;
1854                                 /* FALLTRU */
1855                         case 1048:
1856                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1857                                 break;
1858                         case 2004: /* 2004: bracketed paste mode */
1859                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1860                                 break;
1861                         /* Not implemented mouse modes. See comments there. */
1862                         case 1001: /* mouse highlight mode; can hang the
1863                                       terminal by design when implemented. */
1864                         case 1005: /* UTF-8 mouse mode; will confuse
1865                                       applications not supporting UTF-8
1866                                       and luit. */
1867                         case 1015: /* urxvt mangled mouse mode; incompatible
1868                                       and can be mistaken for other control
1869                                       codes. */
1870                         default:
1871                                 fprintf(stderr,
1872                                         "erresc: unknown private set/reset mode %d\n",
1873                                         *args);
1874                                 break;
1875                         }
1876                 } else {
1877                         switch(*args) {
1878                         case 0:  /* Error (IGNORED) */
1879                                 break;
1880                         case 2:  /* KAM -- keyboard action */
1881                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1882                                 break;
1883                         case 4:  /* IRM -- Insertion-replacement */
1884                                 MODBIT(term.mode, set, MODE_INSERT);
1885                                 break;
1886                         case 12: /* SRM -- Send/Receive */
1887                                 MODBIT(term.mode, !set, MODE_ECHO);
1888                                 break;
1889                         case 20: /* LNM -- Linefeed/new line */
1890                                 MODBIT(term.mode, set, MODE_CRLF);
1891                                 break;
1892                         default:
1893                                 fprintf(stderr,
1894                                         "erresc: unknown set/reset mode %d\n",
1895                                         *args);
1896                                 break;
1897                         }
1898                 }
1899         }
1900 }
1901
1902 void
1903 csihandle(void) {
1904         char buf[40];
1905         int len;
1906
1907         switch(csiescseq.mode) {
1908         default:
1909         unknown:
1910                 fprintf(stderr, "erresc: unknown csi ");
1911                 csidump();
1912                 /* die(""); */
1913                 break;
1914         case '@': /* ICH -- Insert <n> blank char */
1915                 DEFAULT(csiescseq.arg[0], 1);
1916                 tinsertblank(csiescseq.arg[0]);
1917                 break;
1918         case 'A': /* CUU -- Cursor <n> Up */
1919                 DEFAULT(csiescseq.arg[0], 1);
1920                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1921                 break;
1922         case 'B': /* CUD -- Cursor <n> Down */
1923         case 'e': /* VPR --Cursor <n> Down */
1924                 DEFAULT(csiescseq.arg[0], 1);
1925                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1926                 break;
1927         case 'i': /* MC -- Media Copy */
1928                 switch(csiescseq.arg[0]) {
1929                 case 0:
1930                         tdump();
1931                         break;
1932                 case 1:
1933                         tdumpline(term.c.y);
1934                         break;
1935                 case 2:
1936                         tdumpsel();
1937                         break;
1938                 case 4:
1939                         term.mode &= ~MODE_PRINT;
1940                         break;
1941                 case 5:
1942                         term.mode |= MODE_PRINT;
1943                         break;
1944                 }
1945                 break;
1946         case 'c': /* DA -- Device Attributes */
1947                 if(csiescseq.arg[0] == 0)
1948                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1949                 break;
1950         case 'C': /* CUF -- Cursor <n> Forward */
1951         case 'a': /* HPR -- Cursor <n> Forward */
1952                 DEFAULT(csiescseq.arg[0], 1);
1953                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1954                 break;
1955         case 'D': /* CUB -- Cursor <n> Backward */
1956                 DEFAULT(csiescseq.arg[0], 1);
1957                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1958                 break;
1959         case 'E': /* CNL -- Cursor <n> Down and first col */
1960                 DEFAULT(csiescseq.arg[0], 1);
1961                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1962                 break;
1963         case 'F': /* CPL -- Cursor <n> Up and first col */
1964                 DEFAULT(csiescseq.arg[0], 1);
1965                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1966                 break;
1967         case 'g': /* TBC -- Tabulation clear */
1968                 switch(csiescseq.arg[0]) {
1969                 case 0: /* clear current tab stop */
1970                         term.tabs[term.c.x] = 0;
1971                         break;
1972                 case 3: /* clear all the tabs */
1973                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1974                         break;
1975                 default:
1976                         goto unknown;
1977                 }
1978                 break;
1979         case 'G': /* CHA -- Move to <col> */
1980         case '`': /* HPA */
1981                 DEFAULT(csiescseq.arg[0], 1);
1982                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1983                 break;
1984         case 'H': /* CUP -- Move to <row> <col> */
1985         case 'f': /* HVP */
1986                 DEFAULT(csiescseq.arg[0], 1);
1987                 DEFAULT(csiescseq.arg[1], 1);
1988                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1989                 break;
1990         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1991                 DEFAULT(csiescseq.arg[0], 1);
1992                 tputtab(csiescseq.arg[0]);
1993                 break;
1994         case 'J': /* ED -- Clear screen */
1995                 selclear(NULL);
1996                 switch(csiescseq.arg[0]) {
1997                 case 0: /* below */
1998                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1999                         if(term.c.y < term.row-1) {
2000                                 tclearregion(0, term.c.y+1, term.col-1,
2001                                                 term.row-1);
2002                         }
2003                         break;
2004                 case 1: /* above */
2005                         if(term.c.y > 1)
2006                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2007                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2008                         break;
2009                 case 2: /* all */
2010                         tclearregion(0, 0, term.col-1, term.row-1);
2011                         break;
2012                 default:
2013                         goto unknown;
2014                 }
2015                 break;
2016         case 'K': /* EL -- Clear line */
2017                 switch(csiescseq.arg[0]) {
2018                 case 0: /* right */
2019                         tclearregion(term.c.x, term.c.y, term.col-1,
2020                                         term.c.y);
2021                         break;
2022                 case 1: /* left */
2023                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2024                         break;
2025                 case 2: /* all */
2026                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2027                         break;
2028                 }
2029                 break;
2030         case 'S': /* SU -- Scroll <n> line up */
2031                 DEFAULT(csiescseq.arg[0], 1);
2032                 tscrollup(term.top, csiescseq.arg[0]);
2033                 break;
2034         case 'T': /* SD -- Scroll <n> line down */
2035                 DEFAULT(csiescseq.arg[0], 1);
2036                 tscrolldown(term.top, csiescseq.arg[0]);
2037                 break;
2038         case 'L': /* IL -- Insert <n> blank lines */
2039                 DEFAULT(csiescseq.arg[0], 1);
2040                 tinsertblankline(csiescseq.arg[0]);
2041                 break;
2042         case 'l': /* RM -- Reset Mode */
2043                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2044                 break;
2045         case 'M': /* DL -- Delete <n> lines */
2046                 DEFAULT(csiescseq.arg[0], 1);
2047                 tdeleteline(csiescseq.arg[0]);
2048                 break;
2049         case 'X': /* ECH -- Erase <n> char */
2050                 DEFAULT(csiescseq.arg[0], 1);
2051                 tclearregion(term.c.x, term.c.y,
2052                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2053                 break;
2054         case 'P': /* DCH -- Delete <n> char */
2055                 DEFAULT(csiescseq.arg[0], 1);
2056                 tdeletechar(csiescseq.arg[0]);
2057                 break;
2058         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2059                 DEFAULT(csiescseq.arg[0], 1);
2060                 tputtab(-csiescseq.arg[0]);
2061                 break;
2062         case 'd': /* VPA -- Move to <row> */
2063                 DEFAULT(csiescseq.arg[0], 1);
2064                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2065                 break;
2066         case 'h': /* SM -- Set terminal mode */
2067                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2068                 break;
2069         case 'm': /* SGR -- Terminal attribute (color) */
2070                 tsetattr(csiescseq.arg, csiescseq.narg);
2071                 break;
2072         case 'n': /* DSR – Device Status Report (cursor position) */
2073                 if (csiescseq.arg[0] == 6) {
2074                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2075                                         term.c.y+1, term.c.x+1);
2076                         ttywrite(buf, len);
2077                 }
2078                 break;
2079         case 'r': /* DECSTBM -- Set Scrolling Region */
2080                 if(csiescseq.priv) {
2081                         goto unknown;
2082                 } else {
2083                         DEFAULT(csiescseq.arg[0], 1);
2084                         DEFAULT(csiescseq.arg[1], term.row);
2085                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2086                         tmoveato(0, 0);
2087                 }
2088                 break;
2089         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2090                 tcursor(CURSOR_SAVE);
2091                 break;
2092         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2093                 tcursor(CURSOR_LOAD);
2094                 break;
2095         }
2096 }
2097
2098 void
2099 csidump(void) {
2100         int i;
2101         uint c;
2102
2103         printf("ESC[");
2104         for(i = 0; i < csiescseq.len; i++) {
2105                 c = csiescseq.buf[i] & 0xff;
2106                 if(isprint(c)) {
2107                         putchar(c);
2108                 } else if(c == '\n') {
2109                         printf("(\\n)");
2110                 } else if(c == '\r') {
2111                         printf("(\\r)");
2112                 } else if(c == 0x1b) {
2113                         printf("(\\e)");
2114                 } else {
2115                         printf("(%02x)", c);
2116                 }
2117         }
2118         putchar('\n');
2119 }
2120
2121 void
2122 csireset(void) {
2123         memset(&csiescseq, 0, sizeof(csiescseq));
2124 }
2125
2126 void
2127 strhandle(void) {
2128         char *p = NULL;
2129         int j, narg, par;
2130
2131         term.esc &= ~(ESC_STR_END|ESC_STR);
2132         strparse();
2133         narg = strescseq.narg;
2134         par = atoi(strescseq.args[0]);
2135
2136         switch(strescseq.type) {
2137         case ']': /* OSC -- Operating System Command */
2138                 switch(par) {
2139                 case 0:
2140                 case 1:
2141                 case 2:
2142                         if(narg > 1)
2143                                 xsettitle(strescseq.args[1]);
2144                         return;
2145                 case 4: /* color set */
2146                         if(narg < 3)
2147                                 break;
2148                         p = strescseq.args[2];
2149                         /* fall through */
2150                 case 104: /* color reset, here p = NULL */
2151                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2152                         if (!xsetcolorname(j, p)) {
2153                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2154                         } else {
2155                                 /*
2156                                  * TODO if defaultbg color is changed, borders
2157                                  * are dirty
2158                                  */
2159                                 redraw(0);
2160                         }
2161                         return;
2162                 }
2163                 break;
2164         case 'k': /* old title set compatibility */
2165                 xsettitle(strescseq.args[0]);
2166                 return;
2167         case 'P': /* DCS -- Device Control String */
2168         case '_': /* APC -- Application Program Command */
2169         case '^': /* PM -- Privacy Message */
2170                 return;
2171         }
2172
2173         fprintf(stderr, "erresc: unknown str ");
2174         strdump();
2175 }
2176
2177 void
2178 strparse(void) {
2179         char *p = strescseq.buf;
2180
2181         strescseq.narg = 0;
2182         strescseq.buf[strescseq.len] = '\0';
2183         while(p && strescseq.narg < STR_ARG_SIZ)
2184                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2185 }
2186
2187 void
2188 strdump(void) {
2189         int i;
2190         uint c;
2191
2192         printf("ESC%c", strescseq.type);
2193         for(i = 0; i < strescseq.len; i++) {
2194                 c = strescseq.buf[i] & 0xff;
2195                 if(c == '\0') {
2196                         return;
2197                 } else if(isprint(c)) {
2198                         putchar(c);
2199                 } else if(c == '\n') {
2200                         printf("(\\n)");
2201                 } else if(c == '\r') {
2202                         printf("(\\r)");
2203                 } else if(c == 0x1b) {
2204                         printf("(\\e)");
2205                 } else {
2206                         printf("(%02x)", c);
2207                 }
2208         }
2209         printf("ESC\\\n");
2210 }
2211
2212 void
2213 strreset(void) {
2214         memset(&strescseq, 0, sizeof(strescseq));
2215 }
2216
2217 void
2218 tprinter(char *s, size_t len) {
2219         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2220                 fprintf(stderr, "Error writing in %s:%s\n",
2221                         opt_io, strerror(errno));
2222                 close(iofd);
2223                 iofd = -1;
2224         }
2225 }
2226
2227 void
2228 toggleprinter(const Arg *arg) {
2229         term.mode ^= MODE_PRINT;
2230 }
2231
2232 void
2233 printscreen(const Arg *arg) {
2234         tdump();
2235 }
2236
2237 void
2238 printsel(const Arg *arg) {
2239         tdumpsel();
2240 }
2241
2242 void
2243 tdumpsel(void) {
2244         char *ptr;
2245
2246         if((ptr = getsel())) {
2247                 tprinter(ptr, strlen(ptr));
2248                 free(ptr);
2249         }
2250 }
2251
2252 void
2253 tdumpline(int n) {
2254         Glyph *bp, *end;
2255
2256         bp = &term.line[n][0];
2257         end = &bp[term.col-1];
2258         while(end > bp && !strcmp(" ", end->c))
2259                 --end;
2260         if(bp != end || strcmp(bp->c, " ")) {
2261                 for( ;bp <= end; ++bp)
2262                         tprinter(bp->c, strlen(bp->c));
2263         }
2264         tprinter("\n", 1);
2265 }
2266
2267 void
2268 tdump(void) {
2269         int i;
2270
2271         for(i = 0; i < term.row; ++i)
2272                 tdumpline(i);
2273 }
2274
2275 void
2276 tputtab(int n) {
2277         uint x = term.c.x;
2278
2279         if(n > 0) {
2280                 while(x < term.col && n--)
2281                         for(++x; x < term.col && !term.tabs[x]; ++x)
2282                                 /* nothing */ ;
2283         } else if(n < 0) {
2284                 while(x > 0 && n++)
2285                         for(--x; x > 0 && !term.tabs[x]; --x)
2286                                 /* nothing */ ;
2287         }
2288         tmoveto(x, term.c.y);
2289 }
2290
2291 void
2292 techo(char *buf, int len) {
2293         for(; len > 0; buf++, len--) {
2294                 char c = *buf;
2295
2296                 if(ISCONTROL(c)) { /* control code */
2297                         if(c & 0x80) {
2298                                 c &= 0x7f;
2299                                 tputc("^", 1);
2300                                 tputc("[", 1);
2301                         } else if(c != '\n' && c != '\r' && c != '\t') {
2302                                 c ^= '\x40';
2303                                 tputc("^", 1);
2304                         }
2305                         tputc(&c, 1);
2306                 } else {
2307                         break;
2308                 }
2309         }
2310         if(len)
2311                 tputc(buf, len);
2312 }
2313
2314 void
2315 tdeftran(char ascii) {
2316         char c, (*bp)[2];
2317         static char tbl[][2] = {
2318                 {'0', CS_GRAPHIC0}, {'B', CS_USA},
2319                 {0, 0}
2320         };
2321
2322         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2323                 /* nothing */;
2324
2325         if (c == 0)
2326                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2327         else
2328                 term.trantbl[term.icharset] = (*bp)[1];
2329 }
2330
2331 bool
2332 tcontrolcode(uchar ascii) {
2333         static char question[UTF_SIZ] = "?";
2334
2335         switch(ascii) {
2336         case '\t':   /* HT */
2337                 tputtab(1);
2338                 break;
2339         case '\b':   /* BS */
2340                 tmoveto(term.c.x-1, term.c.y);
2341                 break;
2342         case '\r':   /* CR */
2343                 tmoveto(0, term.c.y);
2344                 break;
2345         case '\f':   /* LF */
2346         case '\v':   /* VT */
2347         case '\n':   /* LF */
2348                 /* go to first col if the mode is set */
2349                 tnewline(IS_SET(MODE_CRLF));
2350                 break;
2351         case '\a':   /* BEL */
2352                 if(term.esc & ESC_STR_END) {
2353                         /* backwards compatibility to xterm */
2354                         strhandle();
2355                 } else {
2356                         if(!(xw.state & WIN_FOCUSED))
2357                                 xseturgency(1);
2358                         if (bellvolume)
2359                                 XBell(xw.dpy, bellvolume);
2360                 }
2361                 break;
2362         case '\033': /* ESC */
2363                 csireset();
2364                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2365                 term.esc |= ESC_START;
2366                 return 1;
2367         case '\016': /* SO */
2368                 term.charset = 0;
2369                 break;
2370         case '\017': /* SI */
2371                 term.charset = 1;
2372                 break;
2373         case '\032': /* SUB */
2374                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2375         case '\030': /* CAN */
2376                 csireset();
2377                 break;
2378         case '\005': /* ENQ (IGNORED) */
2379         case '\000': /* NUL (IGNORED) */
2380         case '\021': /* XON (IGNORED) */
2381         case '\023': /* XOFF (IGNORED) */
2382         case 0177:   /* DEL (IGNORED) */
2383         case 0x84:   /* TODO: IND */
2384         case 0x85:   /* TODO: NEL */
2385         case 0x88:   /* TODO: HTS */
2386         case 0x8d:   /* TODO: RI */
2387         case 0x8e:   /* TODO: SS2 */
2388         case 0x8f:   /* TODO: SS3 */
2389         case 0x90:   /* TODO: DCS */
2390         case 0x98:   /* TODO: SOS */
2391         case 0x9a:   /* TODO: DECID */
2392         case 0x9b:   /* TODO: CSI */
2393         case 0x9c:   /* TODO: ST */
2394         case 0x9d:   /* TODO: OSC */
2395         case 0x9e:   /* TODO: PM */
2396         case 0x9f:   /* TODO: APC */
2397                 break;
2398         default:
2399                 return 0;
2400         }
2401         term.esc &= ~(ESC_STR_END|ESC_STR);
2402         return 1;
2403 }
2404
2405 void
2406 tdectest(char c) {
2407         static char E[UTF_SIZ] = "E";
2408         int x, y;
2409
2410         if(c == '8') { /* DEC screen alignment test. */
2411                 for(x = 0; x < term.col; ++x) {
2412                         for(y = 0; y < term.row; ++y)
2413                                 tsetchar(E, &term.c.attr, x, y);
2414                 }
2415         }
2416 }
2417
2418 void
2419 tputc(char *c, int len) {
2420         uchar ascii;
2421         bool control;
2422         long unicodep;
2423         int width;
2424         Glyph *gp;
2425
2426         if(len == 1) {
2427                 width = 1;
2428                 unicodep = ascii = *c;
2429         } else {
2430                 utf8decode(c, &unicodep, UTF_SIZ);
2431                 width = wcwidth(unicodep);
2432                 control = ISCONTROLC1(unicodep);
2433                 ascii = unicodep;
2434         }
2435
2436         if(IS_SET(MODE_PRINT))
2437                 tprinter(c, len);
2438         control = ISCONTROL(unicodep);
2439
2440         /*
2441          * STR sequence must be checked before anything else
2442          * because it uses all following characters until it
2443          * receives a ESC, a SUB, a ST or any other C1 control
2444          * character.
2445          */
2446         if(term.esc & ESC_STR) {
2447                 if(width == 1 &&
2448                    (ascii == '\a' || ascii == 030 ||
2449                     ascii == 032  || ascii == 033 ||
2450                     ISCONTROLC1(unicodep))) {
2451                         term.esc &= ~ESC_STR;
2452                         term.esc |= ESC_STR_END;
2453                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2454                         memmove(&strescseq.buf[strescseq.len], c, len);
2455                         strescseq.len += len;
2456                         return;
2457                 } else {
2458                 /*
2459                  * Here is a bug in terminals. If the user never sends
2460                  * some code to stop the str or esc command, then st
2461                  * will stop responding. But this is better than
2462                  * silently failing with unknown characters. At least
2463                  * then users will report back.
2464                  *
2465                  * In the case users ever get fixed, here is the code:
2466                  */
2467                 /*
2468                  * term.esc = 0;
2469                  * strhandle();
2470                  */
2471                         return;
2472                 }
2473         }
2474
2475         /*
2476          * Actions of control codes must be performed as soon they arrive
2477          * because they can be embedded inside a control sequence, and
2478          * they must not cause conflicts with sequences.
2479          */
2480         if(control) {
2481                 if (tcontrolcode(ascii))
2482                         return;
2483         } else if(term.esc & ESC_START) {
2484                 if(term.esc & ESC_CSI) {
2485                         csiescseq.buf[csiescseq.len++] = ascii;
2486                         if(BETWEEN(ascii, 0x40, 0x7E)
2487                                         || csiescseq.len >= \
2488                                         sizeof(csiescseq.buf)-1) {
2489                                 term.esc = 0;
2490                                 csiparse();
2491                                 csihandle();
2492                         }
2493                         return;
2494                 } else if(term.esc & ESC_ALTCHARSET) {
2495                         tdeftran(ascii);
2496                 } else if(term.esc & ESC_TEST) {
2497                         tdectest(ascii);
2498                 } else {
2499                         switch(ascii) {
2500                         case '[':
2501                                 term.esc |= ESC_CSI;
2502                                 return;
2503                         case '#':
2504                                 term.esc |= ESC_TEST;
2505                                 return;
2506                         case 'P': /* DCS -- Device Control String */
2507                         case '_': /* APC -- Application Program Command */
2508                         case '^': /* PM -- Privacy Message */
2509                         case ']': /* OSC -- Operating System Command */
2510                         case 'k': /* old title set compatibility */
2511                                 strreset();
2512                                 strescseq.type = ascii;
2513                                 term.esc |= ESC_STR;
2514                                 return;
2515                         case '(': /* set primary charset G0 */
2516                         case ')': /* set secondary charset G1 */
2517                         case '*': /* set tertiary charset G2 */
2518                         case '+': /* set quaternary charset G3 */
2519                                 term.icharset = ascii - '(';
2520                                 term.esc |= ESC_ALTCHARSET;
2521                                 return;
2522                         case 'D': /* IND -- Linefeed */
2523                                 if(term.c.y == term.bot) {
2524                                         tscrollup(term.top, 1);
2525                                 } else {
2526                                         tmoveto(term.c.x, term.c.y+1);
2527                                 }
2528                                 break;
2529                         case 'E': /* NEL -- Next line */
2530                                 tnewline(1); /* always go to first col */
2531                                 break;
2532                         case 'H': /* HTS -- Horizontal tab stop */
2533                                 term.tabs[term.c.x] = 1;
2534                                 break;
2535                         case 'M': /* RI -- Reverse index */
2536                                 if(term.c.y == term.top) {
2537                                         tscrolldown(term.top, 1);
2538                                 } else {
2539                                         tmoveto(term.c.x, term.c.y-1);
2540                                 }
2541                                 break;
2542                         case 'Z': /* DECID -- Identify Terminal */
2543                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2544                                 break;
2545                         case 'c': /* RIS -- Reset to inital state */
2546                                 treset();
2547                                 xresettitle();
2548                                 xloadcols();
2549                                 break;
2550                         case '=': /* DECPAM -- Application keypad */
2551                                 term.mode |= MODE_APPKEYPAD;
2552                                 break;
2553                         case '>': /* DECPNM -- Normal keypad */
2554                                 term.mode &= ~MODE_APPKEYPAD;
2555                                 break;
2556                         case '7': /* DECSC -- Save Cursor */
2557                                 tcursor(CURSOR_SAVE);
2558                                 break;
2559                         case '8': /* DECRC -- Restore Cursor */
2560                                 tcursor(CURSOR_LOAD);
2561                                 break;
2562                         case '\\': /* ST -- String Terminator */
2563                                 if(term.esc & ESC_STR_END)
2564                                         strhandle();
2565                                 break;
2566                         default:
2567                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2568                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2569                                 break;
2570                         }
2571                 }
2572                 term.esc = 0;
2573                 /*
2574                  * All characters which form part of a sequence are not
2575                  * printed
2576                  */
2577                 return;
2578         }
2579         /*
2580          * Display control codes only if we are in graphic mode
2581          */
2582         if(control && term.trantbl[term.charset] != CS_GRAPHIC0)
2583                 return;
2584         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2585                 selclear(NULL);
2586
2587         gp = &term.line[term.c.y][term.c.x];
2588         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2589                 gp->mode |= ATTR_WRAP;
2590                 tnewline(1);
2591         }
2592
2593         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2594                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2595
2596         if(term.c.x+width > term.col)
2597                 tnewline(1);
2598
2599         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2600
2601         if(width == 2) {
2602                 gp->mode |= ATTR_WIDE;
2603                 if(term.c.x+1 < term.col) {
2604                         gp[1].c[0] = '\0';
2605                         gp[1].mode = ATTR_WDUMMY;
2606                 }
2607         }
2608         if(term.c.x+width < term.col) {
2609                 tmoveto(term.c.x+width, term.c.y);
2610         } else {
2611                 term.c.state |= CURSOR_WRAPNEXT;
2612         }
2613 }
2614
2615 int
2616 tresize(int col, int row) {
2617         int i;
2618         int minrow = MIN(row, term.row);
2619         int mincol = MIN(col, term.col);
2620         int slide = term.c.y - row + 1;
2621         bool *bp;
2622         Line *orig;
2623         TCursor c;
2624
2625         if(col < 1 || row < 1)
2626                 return 0;
2627
2628         /* free unneeded rows */
2629         i = 0;
2630         if(slide > 0) {
2631                 /*
2632                  * slide screen to keep cursor where we expect it -
2633                  * tscrollup would work here, but we can optimize to
2634                  * memmove because we're freeing the earlier lines
2635                  */
2636                 for(/* i = 0 */; i < slide; i++) {
2637                         free(term.line[i]);
2638                         free(term.alt[i]);
2639                 }
2640                 memmove(term.line, term.line + slide, row * sizeof(Line));
2641                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2642         }
2643         for(i += row; i < term.row; i++) {
2644                 free(term.line[i]);
2645                 free(term.alt[i]);
2646         }
2647
2648         /* resize to new height */
2649         term.line = xrealloc(term.line, row * sizeof(Line));
2650         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2651         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2652         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2653
2654         /* resize each row to new width, zero-pad if needed */
2655         for(i = 0; i < minrow; i++) {
2656                 term.dirty[i] = 1;
2657                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2658                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2659         }
2660
2661         /* allocate any new rows */
2662         for(/* i == minrow */; i < row; i++) {
2663                 term.dirty[i] = 1;
2664                 term.line[i] = xmalloc(col * sizeof(Glyph));
2665                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2666         }
2667         if(col > term.col) {
2668                 bp = term.tabs + term.col;
2669
2670                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2671                 while(--bp > term.tabs && !*bp)
2672                         /* nothing */ ;
2673                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2674                         *bp = 1;
2675         }
2676         /* update terminal size */
2677         term.col = col;
2678         term.row = row;
2679         /* reset scrolling region */
2680         tsetscroll(0, row-1);
2681         /* make use of the LIMIT in tmoveto */
2682         tmoveto(term.c.x, term.c.y);
2683         /* Clearing both screens */
2684         orig = term.line;
2685         c = term.c;
2686         do {
2687                 if(mincol < col && 0 < minrow) {
2688                         tclearregion(mincol, 0, col - 1, minrow - 1);
2689                 }
2690                 if(0 < col && minrow < row) {
2691                         tclearregion(0, minrow, col - 1, row - 1);
2692                 }
2693                 tswapscreen();
2694                 tcursor(CURSOR_LOAD);
2695         } while(orig != term.line);
2696         term.c = c;
2697
2698         return (slide > 0);
2699 }
2700
2701 void
2702 xresize(int col, int row) {
2703         xw.tw = MAX(1, col * xw.cw);
2704         xw.th = MAX(1, row * xw.ch);
2705
2706         XFreePixmap(xw.dpy, xw.buf);
2707         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2708                         DefaultDepth(xw.dpy, xw.scr));
2709         XftDrawChange(xw.draw, xw.buf);
2710         xclear(0, 0, xw.w, xw.h);
2711 }
2712
2713 static inline ushort
2714 sixd_to_16bit(int x) {
2715         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2716 }
2717
2718 void
2719 xloadcols(void) {
2720         int i, r, g, b;
2721         XRenderColor color = { .alpha = 0xffff };
2722         static bool loaded;
2723         Colour *cp;
2724
2725         if(loaded) {
2726                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2727                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2728         }
2729
2730         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2731         for(i = 0; i < LEN(colorname); i++) {
2732                 if(!colorname[i])
2733                         continue;
2734                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2735                         die("Could not allocate color '%s'\n", colorname[i]);
2736                 }
2737         }
2738
2739         /* load colors [16-255] ; same colors as xterm */
2740         for(i = 16, r = 0; r < 6; r++) {
2741                 for(g = 0; g < 6; g++) {
2742                         for(b = 0; b < 6; b++) {
2743                                 color.red = sixd_to_16bit(r);
2744                                 color.green = sixd_to_16bit(g);
2745                                 color.blue = sixd_to_16bit(b);
2746                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2747                                         die("Could not allocate color %d\n", i);
2748                                 }
2749                                 i++;
2750                         }
2751                 }
2752         }
2753
2754         for(r = 0; r < 24; r++, i++) {
2755                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2756                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2757                                         &dc.col[i])) {
2758                         die("Could not allocate color %d\n", i);
2759                 }
2760         }
2761         loaded = true;
2762 }
2763
2764 int
2765 xsetcolorname(int x, const char *name) {
2766         XRenderColor color = { .alpha = 0xffff };
2767         Colour colour;
2768         if(!BETWEEN(x, 0, LEN(colorname)))
2769                 return -1;
2770         if(!name) {
2771                 if(BETWEEN(x, 16, 16 + 215)) {
2772                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2773                         color.red = sixd_to_16bit(r);
2774                         color.green = sixd_to_16bit(g);
2775                         color.blue = sixd_to_16bit(b);
2776                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2777                                 return 0; /* something went wrong */
2778                         dc.col[x] = colour;
2779                         return 1;
2780                 } else if(BETWEEN(x, 16 + 216, 255)) {
2781                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2782                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2783                                 return 0; /* something went wrong */
2784                         dc.col[x] = colour;
2785                         return 1;
2786                 } else {
2787                         name = colorname[x];
2788                 }
2789         }
2790         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2791                 return 0;
2792         dc.col[x] = colour;
2793         return 1;
2794 }
2795
2796 void
2797 xtermclear(int col1, int row1, int col2, int row2) {
2798         XftDrawRect(xw.draw,
2799                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2800                         borderpx + col1 * xw.cw,
2801                         borderpx + row1 * xw.ch,
2802                         (col2-col1+1) * xw.cw,
2803                         (row2-row1+1) * xw.ch);
2804 }
2805
2806 /*
2807  * Absolute coordinates.
2808  */
2809 void
2810 xclear(int x1, int y1, int x2, int y2) {
2811         XftDrawRect(xw.draw,
2812                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2813                         x1, y1, x2-x1, y2-y1);
2814 }
2815
2816 void
2817 xhints(void) {
2818         XClassHint class = {opt_class ? opt_class : termname, termname};
2819         XWMHints wm = {.flags = InputHint, .input = 1};
2820         XSizeHints *sizeh = NULL;
2821
2822         sizeh = XAllocSizeHints();
2823
2824         sizeh->flags = PSize | PResizeInc | PBaseSize;
2825         sizeh->height = xw.h;
2826         sizeh->width = xw.w;
2827         sizeh->height_inc = xw.ch;
2828         sizeh->width_inc = xw.cw;
2829         sizeh->base_height = 2 * borderpx;
2830         sizeh->base_width = 2 * borderpx;
2831         if(xw.isfixed == True) {
2832                 sizeh->flags |= PMaxSize | PMinSize;
2833                 sizeh->min_width = sizeh->max_width = xw.w;
2834                 sizeh->min_height = sizeh->max_height = xw.h;
2835         }
2836         if(xw.gm & (XValue|YValue)) {
2837                 sizeh->flags |= USPosition | PWinGravity;
2838                 sizeh->x = xw.l;
2839                 sizeh->y = xw.t;
2840                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2841         }
2842
2843         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2844                         &class);
2845         XFree(sizeh);
2846 }
2847
2848 int
2849 xgeommasktogravity(int mask) {
2850         switch(mask & (XNegative|YNegative)) {
2851         case 0:
2852                 return NorthWestGravity;
2853         case XNegative:
2854                 return NorthEastGravity;
2855         case YNegative:
2856                 return SouthWestGravity;
2857         }
2858         return SouthEastGravity;
2859 }
2860
2861 int
2862 xloadfont(Font *f, FcPattern *pattern) {
2863         FcPattern *match;
2864         FcResult result;
2865
2866         match = FcFontMatch(NULL, pattern, &result);
2867         if(!match)
2868                 return 1;
2869
2870         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2871                 FcPatternDestroy(match);
2872                 return 1;
2873         }
2874
2875         f->set = NULL;
2876         f->pattern = FcPatternDuplicate(pattern);
2877
2878         f->ascent = f->match->ascent;
2879         f->descent = f->match->descent;
2880         f->lbearing = 0;
2881         f->rbearing = f->match->max_advance_width;
2882
2883         f->height = f->ascent + f->descent;
2884         f->width = f->lbearing + f->rbearing;
2885
2886         return 0;
2887 }
2888
2889 void
2890 xloadfonts(char *fontstr, double fontsize) {
2891         FcPattern *pattern;
2892         FcResult r_sz, r_psz;
2893         double fontval;
2894
2895         if(fontstr[0] == '-') {
2896                 pattern = XftXlfdParse(fontstr, False, False);
2897         } else {
2898                 pattern = FcNameParse((FcChar8 *)fontstr);
2899         }
2900
2901         if(!pattern)
2902                 die("st: can't open font %s\n", fontstr);
2903
2904         if(fontsize > 0) {
2905                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2906                 FcPatternDel(pattern, FC_SIZE);
2907                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2908                 usedfontsize = fontsize;
2909         } else {
2910                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2911                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2912                 if(r_psz == FcResultMatch) {
2913                         usedfontsize = fontval;
2914                 } else if(r_sz == FcResultMatch) {
2915                         usedfontsize = -1;
2916                 } else {
2917                         /*
2918                          * Default font size is 12, if none given. This is to
2919                          * have a known usedfontsize value.
2920                          */
2921                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2922                         usedfontsize = 12;
2923                 }
2924         }
2925
2926         FcConfigSubstitute(0, pattern, FcMatchPattern);
2927         FcDefaultSubstitute(pattern);
2928
2929         if(xloadfont(&dc.font, pattern))
2930                 die("st: can't open font %s\n", fontstr);
2931
2932         if(usedfontsize < 0) {
2933                 FcPatternGetDouble(dc.font.match->pattern,
2934                                    FC_PIXEL_SIZE, 0, &fontval);
2935                 usedfontsize = fontval;
2936         }
2937
2938         /* Setting character width and height. */
2939         xw.cw = CEIL(dc.font.width * cwscale);
2940         xw.ch = CEIL(dc.font.height * chscale);
2941
2942         FcPatternDel(pattern, FC_SLANT);
2943         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2944         if(xloadfont(&dc.ifont, pattern))
2945                 die("st: can't open font %s\n", fontstr);
2946
2947         FcPatternDel(pattern, FC_WEIGHT);
2948         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2949         if(xloadfont(&dc.ibfont, pattern))
2950                 die("st: can't open font %s\n", fontstr);
2951
2952         FcPatternDel(pattern, FC_SLANT);
2953         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2954         if(xloadfont(&dc.bfont, pattern))
2955                 die("st: can't open font %s\n", fontstr);
2956
2957         FcPatternDestroy(pattern);
2958 }
2959
2960 int
2961 xloadfontset(Font *f) {
2962         FcResult result;
2963
2964         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2965                 return 1;
2966         return 0;
2967 }
2968
2969 void
2970 xunloadfont(Font *f) {
2971         XftFontClose(xw.dpy, f->match);
2972         FcPatternDestroy(f->pattern);
2973         if(f->set)
2974                 FcFontSetDestroy(f->set);
2975 }
2976
2977 void
2978 xunloadfonts(void) {
2979         /* Free the loaded fonts in the font cache.  */
2980         while(frclen > 0)
2981                 XftFontClose(xw.dpy, frc[--frclen].font);
2982
2983         xunloadfont(&dc.font);
2984         xunloadfont(&dc.bfont);
2985         xunloadfont(&dc.ifont);
2986         xunloadfont(&dc.ibfont);
2987 }
2988
2989 void
2990 xzoom(const Arg *arg) {
2991         xunloadfonts();
2992         xloadfonts(usedfont, usedfontsize + arg->i);
2993         cresize(0, 0);
2994         redraw(0);
2995 }
2996
2997 void
2998 xinit(void) {
2999         XGCValues gcvalues;
3000         Cursor cursor;
3001         Window parent;
3002         pid_t thispid = getpid();
3003
3004         if(!(xw.dpy = XOpenDisplay(NULL)))
3005                 die("Can't open display\n");
3006         xw.scr = XDefaultScreen(xw.dpy);
3007         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3008
3009         /* font */
3010         if(!FcInit())
3011                 die("Could not init fontconfig.\n");
3012
3013         usedfont = (opt_font == NULL)? font : opt_font;
3014         xloadfonts(usedfont, 0);
3015
3016         /* colors */
3017         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3018         xloadcols();
3019
3020         /* adjust fixed window geometry */
3021         xw.w = 2 * borderpx + term.col * xw.cw;
3022         xw.h = 2 * borderpx + term.row * xw.ch;
3023         if(xw.gm & XNegative)
3024                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3025         if(xw.gm & YNegative)
3026                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3027
3028         /* Events */
3029         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3030         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3031         xw.attrs.bit_gravity = NorthWestGravity;
3032         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3033                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3034                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3035         xw.attrs.colormap = xw.cmap;
3036
3037         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3038                         XRootWindow(xw.dpy, xw.scr);
3039         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3040                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3041                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3042                         | CWEventMask | CWColormap, &xw.attrs);
3043
3044         memset(&gcvalues, 0, sizeof(gcvalues));
3045         gcvalues.graphics_exposures = False;
3046         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3047                         &gcvalues);
3048         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3049                         DefaultDepth(xw.dpy, xw.scr));
3050         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3051         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3052
3053         /* Xft rendering context */
3054         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3055
3056         /* input methods */
3057         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3058                 XSetLocaleModifiers("@im=local");
3059                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3060                         XSetLocaleModifiers("@im=");
3061                         if((xw.xim = XOpenIM(xw.dpy,
3062                                         NULL, NULL, NULL)) == NULL) {
3063                                 die("XOpenIM failed. Could not open input"
3064                                         " device.\n");
3065                         }
3066                 }
3067         }
3068         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3069                                            | XIMStatusNothing, XNClientWindow, xw.win,
3070                                            XNFocusWindow, xw.win, NULL);
3071         if(xw.xic == NULL)
3072                 die("XCreateIC failed. Could not obtain input method.\n");
3073
3074         /* white cursor, black outline */
3075         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3076         XDefineCursor(xw.dpy, xw.win, cursor);
3077         XRecolorCursor(xw.dpy, cursor,
3078                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3079                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3080
3081         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3082         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3083         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3084         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3085
3086         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3087         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3088                         PropModeReplace, (uchar *)&thispid, 1);
3089
3090         xresettitle();
3091         XMapWindow(xw.dpy, xw.win);
3092         xhints();
3093         XSync(xw.dpy, False);
3094 }
3095
3096 void
3097 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3098         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3099             width = charlen * xw.cw, xp, i;
3100         int frcflags;
3101         int u8fl, u8fblen, u8cblen, doesexist;
3102         char *u8c, *u8fs;
3103         long unicodep;
3104         Font *font = &dc.font;
3105         FcResult fcres;
3106         FcPattern *fcpattern, *fontpattern;
3107         FcFontSet *fcsets[] = { NULL };
3108         FcCharSet *fccharset;
3109         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3110         XRenderColor colfg, colbg;
3111         XRectangle r;
3112         int oneatatime;
3113
3114         frcflags = FRC_NORMAL;
3115
3116         if(base.mode & ATTR_ITALIC) {
3117                 if(base.fg == defaultfg)
3118                         base.fg = defaultitalic;
3119                 font = &dc.ifont;
3120                 frcflags = FRC_ITALIC;
3121         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3122                 if(base.fg == defaultfg)
3123                         base.fg = defaultitalic;
3124                 font = &dc.ibfont;
3125                 frcflags = FRC_ITALICBOLD;
3126         } else if(base.mode & ATTR_UNDERLINE) {
3127                 if(base.fg == defaultfg)
3128                         base.fg = defaultunderline;
3129         }
3130
3131         if(IS_TRUECOL(base.fg)) {
3132                 colfg.alpha = 0xffff;
3133                 colfg.red = TRUERED(base.fg);
3134                 colfg.green = TRUEGREEN(base.fg);
3135                 colfg.blue = TRUEBLUE(base.fg);
3136                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3137                 fg = &truefg;
3138         } else {
3139                 fg = &dc.col[base.fg];
3140         }
3141
3142         if(IS_TRUECOL(base.bg)) {
3143                 colbg.alpha = 0xffff;
3144                 colbg.green = TRUEGREEN(base.bg);
3145                 colbg.red = TRUERED(base.bg);
3146                 colbg.blue = TRUEBLUE(base.bg);
3147                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3148                 bg = &truebg;
3149         } else {
3150                 bg = &dc.col[base.bg];
3151         }
3152
3153         if(base.mode & ATTR_BOLD) {
3154                 if(BETWEEN(base.fg, 0, 7)) {
3155                         /* basic system colors */
3156                         fg = &dc.col[base.fg + 8];
3157                 } else if(BETWEEN(base.fg, 16, 195)) {
3158                         /* 256 colors */
3159                         fg = &dc.col[base.fg + 36];
3160                 } else if(BETWEEN(base.fg, 232, 251)) {
3161                         /* greyscale */
3162                         fg = &dc.col[base.fg + 4];
3163                 }
3164                 /*
3165                  * Those ranges will not be brightened:
3166                  *    8 - 15 – bright system colors
3167                  *    196 - 231 – highest 256 color cube
3168                  *    252 - 255 – brightest colors in greyscale
3169                  */
3170                 font = &dc.bfont;
3171                 frcflags = FRC_BOLD;
3172         }
3173
3174         if(IS_SET(MODE_REVERSE)) {
3175                 if(fg == &dc.col[defaultfg]) {
3176                         fg = &dc.col[defaultbg];
3177                 } else {
3178                         colfg.red = ~fg->color.red;
3179                         colfg.green = ~fg->color.green;
3180                         colfg.blue = ~fg->color.blue;
3181                         colfg.alpha = fg->color.alpha;
3182                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3183                                         &revfg);
3184                         fg = &revfg;
3185                 }
3186
3187                 if(bg == &dc.col[defaultbg]) {
3188                         bg = &dc.col[defaultfg];
3189                 } else {
3190                         colbg.red = ~bg->color.red;
3191                         colbg.green = ~bg->color.green;
3192                         colbg.blue = ~bg->color.blue;
3193                         colbg.alpha = bg->color.alpha;
3194                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3195                                         &revbg);
3196                         bg = &revbg;
3197                 }
3198         }
3199
3200         if(base.mode & ATTR_REVERSE) {
3201                 temp = fg;
3202                 fg = bg;
3203                 bg = temp;
3204         }
3205
3206         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3207                 fg = bg;
3208
3209         /* Intelligent cleaning up of the borders. */
3210         if(x == 0) {
3211                 xclear(0, (y == 0)? 0 : winy, borderpx,
3212                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3213         }
3214         if(x + charlen >= term.col) {
3215                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3216                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3217         }
3218         if(y == 0)
3219                 xclear(winx, 0, winx + width, borderpx);
3220         if(y == term.row-1)
3221                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3222
3223         /* Clean up the region we want to draw to. */
3224         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3225
3226         /* Set the clip region because Xft is sometimes dirty. */
3227         r.x = 0;
3228         r.y = 0;
3229         r.height = xw.ch;
3230         r.width = width;
3231         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3232
3233         for(xp = winx; bytelen > 0;) {
3234                 /*
3235                  * Search for the range in the to be printed string of glyphs
3236                  * that are in the main font. Then print that range. If
3237                  * some glyph is found that is not in the font, do the
3238                  * fallback dance.
3239                  */
3240                 u8fs = s;
3241                 u8fblen = 0;
3242                 u8fl = 0;
3243                 oneatatime = font->width != xw.cw;
3244                 for(;;) {
3245                         u8c = s;
3246                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3247                         s += u8cblen;
3248                         bytelen -= u8cblen;
3249
3250                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3251                         if(oneatatime || !doesexist || bytelen <= 0) {
3252                                 if(oneatatime || bytelen <= 0) {
3253                                         if(doesexist) {
3254                                                 u8fl++;
3255                                                 u8fblen += u8cblen;
3256                                         }
3257                                 }
3258
3259                                 if(u8fl > 0) {
3260                                         XftDrawStringUtf8(xw.draw, fg,
3261                                                         font->match, xp,
3262                                                         winy + font->ascent,
3263                                                         (FcChar8 *)u8fs,
3264                                                         u8fblen);
3265                                         xp += xw.cw * u8fl;
3266
3267                                 }
3268                                 break;
3269                         }
3270
3271                         u8fl++;
3272                         u8fblen += u8cblen;
3273                 }
3274                 if(doesexist) {
3275                         if(oneatatime)
3276                                 continue;
3277                         break;
3278                 }
3279
3280                 /* Search the font cache. */
3281                 for(i = 0; i < frclen; i++) {
3282                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3283                                         && frc[i].flags == frcflags) {
3284                                 break;
3285                         }
3286                 }
3287
3288                 /* Nothing was found. */
3289                 if(i >= frclen) {
3290                         if(!font->set)
3291                                 xloadfontset(font);
3292                         fcsets[0] = font->set;
3293
3294                         /*
3295                          * Nothing was found in the cache. Now use
3296                          * some dozen of Fontconfig calls to get the
3297                          * font for one single character.
3298                          *
3299                          * Xft and fontconfig are design failures.
3300                          */
3301                         fcpattern = FcPatternDuplicate(font->pattern);
3302                         fccharset = FcCharSetCreate();
3303
3304                         FcCharSetAddChar(fccharset, unicodep);
3305                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3306                                         fccharset);
3307                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3308                                         FcTrue);
3309
3310                         FcConfigSubstitute(0, fcpattern,
3311                                         FcMatchPattern);
3312                         FcDefaultSubstitute(fcpattern);
3313
3314                         fontpattern = FcFontSetMatch(0, fcsets,
3315                                         FcTrue, fcpattern, &fcres);
3316
3317                         /*
3318                          * Overwrite or create the new cache entry.
3319                          */
3320                         if(frclen >= LEN(frc)) {
3321                                 frclen = LEN(frc) - 1;
3322                                 XftFontClose(xw.dpy, frc[frclen].font);
3323                         }
3324
3325                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3326                                         fontpattern);
3327                         frc[frclen].flags = frcflags;
3328
3329                         i = frclen;
3330                         frclen++;
3331
3332                         FcPatternDestroy(fcpattern);
3333                         FcCharSetDestroy(fccharset);
3334                 }
3335
3336                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3337                                 xp, winy + frc[i].font->ascent,
3338                                 (FcChar8 *)u8c, u8cblen);
3339
3340                 xp += xw.cw * wcwidth(unicodep);
3341         }
3342
3343         /*
3344          * This is how the loop above actually should be. Why does the
3345          * application have to care about font details?
3346          *
3347          * I have to repeat: Xft and Fontconfig are design failures.
3348          */
3349         /*
3350         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3351                         winy + font->ascent, (FcChar8 *)s, bytelen);
3352         */
3353
3354         if(base.mode & ATTR_UNDERLINE) {
3355                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3356                                 width, 1);
3357         }
3358
3359         /* Reset clip to none. */
3360         XftDrawSetClip(xw.draw, 0);
3361 }
3362
3363 void
3364 xdrawcursor(void) {
3365         static int oldx = 0, oldy = 0;
3366         int sl, width, curx;
3367         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3368
3369         LIMIT(oldx, 0, term.col-1);
3370         LIMIT(oldy, 0, term.row-1);
3371
3372         curx = term.c.x;
3373
3374         /* adjust position if in dummy */
3375         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3376                 oldx--;
3377         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3378                 curx--;
3379
3380         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3381
3382         /* remove the old cursor */
3383         sl = utf8len(term.line[oldy][oldx].c);
3384         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3385         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3386                         oldy, width, sl);
3387
3388         /* draw the new one */
3389         if(!(IS_SET(MODE_HIDE))) {
3390                 if(xw.state & WIN_FOCUSED) {
3391                         if(IS_SET(MODE_REVERSE)) {
3392                                 g.mode |= ATTR_REVERSE;
3393                                 g.fg = defaultcs;
3394                                 g.bg = defaultfg;
3395                         }
3396
3397                         sl = utf8len(g.c);
3398                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3399                                 ? 2 : 1;
3400                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3401                 } else {
3402                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3403                                         borderpx + curx * xw.cw,
3404                                         borderpx + term.c.y * xw.ch,
3405                                         xw.cw - 1, 1);
3406                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3407                                         borderpx + curx * xw.cw,
3408                                         borderpx + term.c.y * xw.ch,
3409                                         1, xw.ch - 1);
3410                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3411                                         borderpx + (curx + 1) * xw.cw - 1,
3412                                         borderpx + term.c.y * xw.ch,
3413                                         1, xw.ch - 1);
3414                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3415                                         borderpx + curx * xw.cw,
3416                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3417                                         xw.cw, 1);
3418                 }
3419                 oldx = curx, oldy = term.c.y;
3420         }
3421 }
3422
3423
3424 void
3425 xsettitle(char *p) {
3426         XTextProperty prop;
3427
3428         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3429                         &prop);
3430         XSetWMName(xw.dpy, xw.win, &prop);
3431         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3432         XFree(prop.value);
3433 }
3434
3435 void
3436 xresettitle(void) {
3437         xsettitle(opt_title ? opt_title : "st");
3438 }
3439
3440 void
3441 redraw(int timeout) {
3442         struct timespec tv = {0, timeout * 1000};
3443
3444         draw();
3445
3446         if(timeout > 0) {
3447                 nanosleep(&tv, NULL);
3448                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3449         }
3450 }
3451
3452 void
3453 draw(void) {
3454         drawregion(0, 0, term.col, term.row);
3455         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3456                         xw.h, 0, 0);
3457         XSetForeground(xw.dpy, dc.gc,
3458                         dc.col[IS_SET(MODE_REVERSE)?
3459                                 defaultfg : defaultbg].pixel);
3460 }
3461
3462 void
3463 drawregion(int x1, int y1, int x2, int y2) {
3464         int ic, ib, x, y, ox, sl;
3465         Glyph base, new;
3466         char buf[DRAW_BUF_SIZ];
3467         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3468         long unicodep;
3469
3470         if(!(xw.state & WIN_VISIBLE))
3471                 return;
3472
3473         for(y = y1; y < y2; y++) {
3474                 if(!term.dirty[y])
3475                         continue;
3476
3477                 xtermclear(0, y, term.col, y);
3478                 term.dirty[y] = 0;
3479                 base = term.line[y][0];
3480                 ic = ib = ox = 0;
3481                 for(x = x1; x < x2; x++) {
3482                         new = term.line[y][x];
3483                         if(new.mode == ATTR_WDUMMY)
3484                                 continue;
3485                         if(ena_sel && selected(x, y))
3486                                 new.mode ^= ATTR_REVERSE;
3487                         if(ib > 0 && (ATTRCMP(base, new)
3488                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3489                                 xdraws(buf, base, ox, y, ic, ib);
3490                                 ic = ib = 0;
3491                         }
3492                         if(ib == 0) {
3493                                 ox = x;
3494                                 base = new;
3495                         }
3496
3497                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3498                         memcpy(buf+ib, new.c, sl);
3499                         ib += sl;
3500                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3501                 }
3502                 if(ib > 0)
3503                         xdraws(buf, base, ox, y, ic, ib);
3504         }
3505         xdrawcursor();
3506 }
3507
3508 void
3509 expose(XEvent *ev) {
3510         XExposeEvent *e = &ev->xexpose;
3511
3512         if(xw.state & WIN_REDRAW) {
3513                 if(!e->count)
3514                         xw.state &= ~WIN_REDRAW;
3515         }
3516         redraw(0);
3517 }
3518
3519 void
3520 visibility(XEvent *ev) {
3521         XVisibilityEvent *e = &ev->xvisibility;
3522
3523         if(e->state == VisibilityFullyObscured) {
3524                 xw.state &= ~WIN_VISIBLE;
3525         } else if(!(xw.state & WIN_VISIBLE)) {
3526                 /* need a full redraw for next Expose, not just a buf copy */
3527                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3528         }
3529 }
3530
3531 void
3532 unmap(XEvent *ev) {
3533         xw.state &= ~WIN_VISIBLE;
3534 }
3535
3536 void
3537 xsetpointermotion(int set) {
3538         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3539         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3540 }
3541
3542 void
3543 xseturgency(int add) {
3544         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3545
3546         MODBIT(h->flags, add, XUrgencyHint);
3547         XSetWMHints(xw.dpy, xw.win, h);
3548         XFree(h);
3549 }
3550
3551 void
3552 focus(XEvent *ev) {
3553         XFocusChangeEvent *e = &ev->xfocus;
3554
3555         if(e->mode == NotifyGrab)
3556                 return;
3557
3558         if(ev->type == FocusIn) {
3559                 XSetICFocus(xw.xic);
3560                 xw.state |= WIN_FOCUSED;
3561                 xseturgency(0);
3562                 if(IS_SET(MODE_FOCUS))
3563                         ttywrite("\033[I", 3);
3564         } else {
3565                 XUnsetICFocus(xw.xic);
3566                 xw.state &= ~WIN_FOCUSED;
3567                 if(IS_SET(MODE_FOCUS))
3568                         ttywrite("\033[O", 3);
3569         }
3570 }
3571
3572 static inline bool
3573 match(uint mask, uint state) {
3574         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3575 }
3576
3577 void
3578 numlock(const Arg *dummy) {
3579         term.numlock ^= 1;
3580 }
3581
3582 char*
3583 kmap(KeySym k, uint state) {
3584         Key *kp;
3585         int i;
3586
3587         /* Check for mapped keys out of X11 function keys. */
3588         for(i = 0; i < LEN(mappedkeys); i++) {
3589                 if(mappedkeys[i] == k)
3590                         break;
3591         }
3592         if(i == LEN(mappedkeys)) {
3593                 if((k & 0xFFFF) < 0xFD00)
3594                         return NULL;
3595         }
3596
3597         for(kp = key; kp < key + LEN(key); kp++) {
3598                 if(kp->k != k)
3599                         continue;
3600
3601                 if(!match(kp->mask, state))
3602                         continue;
3603
3604                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3605                         continue;
3606                 if(term.numlock && kp->appkey == 2)
3607                         continue;
3608
3609                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3610                         continue;
3611
3612                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3613                         continue;
3614
3615                 return kp->s;
3616         }
3617
3618         return NULL;
3619 }
3620
3621 void
3622 kpress(XEvent *ev) {
3623         XKeyEvent *e = &ev->xkey;
3624         KeySym ksym;
3625         char buf[32], *customkey;
3626         int len;
3627         long c;
3628         Status status;
3629         Shortcut *bp;
3630
3631         if(IS_SET(MODE_KBDLOCK))
3632                 return;
3633
3634         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3635         /* 1. shortcuts */
3636         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3637                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3638                         bp->func(&(bp->arg));
3639                         return;
3640                 }
3641         }
3642
3643         /* 2. custom keys from config.h */
3644         if((customkey = kmap(ksym, e->state))) {
3645                 ttysend(customkey, strlen(customkey));
3646                 return;
3647         }
3648
3649         /* 3. composed string from input method */
3650         if(len == 0)
3651                 return;
3652         if(len == 1 && e->state & Mod1Mask) {
3653                 if(IS_SET(MODE_8BIT)) {
3654                         if(*buf < 0177) {
3655                                 c = *buf | 0x80;
3656                                 len = utf8encode(c, buf, UTF_SIZ);
3657                         }
3658                 } else {
3659                         buf[1] = buf[0];
3660                         buf[0] = '\033';
3661                         len = 2;
3662                 }
3663         }
3664         ttysend(buf, len);
3665 }
3666
3667
3668 void
3669 cmessage(XEvent *e) {
3670         /*
3671          * See xembed specs
3672          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3673          */
3674         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3675                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3676                         xw.state |= WIN_FOCUSED;
3677                         xseturgency(0);
3678                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3679                         xw.state &= ~WIN_FOCUSED;
3680                 }
3681         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3682                 /* Send SIGHUP to shell */
3683                 kill(pid, SIGHUP);
3684                 exit(EXIT_SUCCESS);
3685         }
3686 }
3687
3688 void
3689 cresize(int width, int height) {
3690         int col, row;
3691
3692         if(width != 0)
3693                 xw.w = width;
3694         if(height != 0)
3695                 xw.h = height;
3696
3697         col = (xw.w - 2 * borderpx) / xw.cw;
3698         row = (xw.h - 2 * borderpx) / xw.ch;
3699
3700         tresize(col, row);
3701         xresize(col, row);
3702         ttyresize();
3703 }
3704
3705 void
3706 resize(XEvent *e) {
3707         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3708                 return;
3709
3710         cresize(e->xconfigure.width, e->xconfigure.height);
3711 }
3712
3713 void
3714 run(void) {
3715         XEvent ev;
3716         int w = xw.w, h = xw.h;
3717         fd_set rfd;
3718         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3719         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3720
3721         /* Waiting for window mapping */
3722         while(1) {
3723                 XNextEvent(xw.dpy, &ev);
3724                 if(ev.type == ConfigureNotify) {
3725                         w = ev.xconfigure.width;
3726                         h = ev.xconfigure.height;
3727                 } else if(ev.type == MapNotify) {
3728                         break;
3729                 }
3730         }
3731
3732         ttynew();
3733         cresize(w, h);
3734
3735         gettimeofday(&last, NULL);
3736         lastblink = last;
3737
3738         for(xev = actionfps;;) {
3739                 long deltatime;
3740
3741                 FD_ZERO(&rfd);
3742                 FD_SET(cmdfd, &rfd);
3743                 FD_SET(xfd, &rfd);
3744
3745                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3746                         if(errno == EINTR)
3747                                 continue;
3748                         die("select failed: %s\n", strerror(errno));
3749                 }
3750                 if(FD_ISSET(cmdfd, &rfd)) {
3751                         ttyread();
3752                         if(blinktimeout) {
3753                                 blinkset = tattrset(ATTR_BLINK);
3754                                 if(!blinkset)
3755                                         MODBIT(term.mode, 0, MODE_BLINK);
3756                         }
3757                 }
3758
3759                 if(FD_ISSET(xfd, &rfd))
3760                         xev = actionfps;
3761
3762                 gettimeofday(&now, NULL);
3763                 drawtimeout.tv_sec = 0;
3764                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3765                 tv = &drawtimeout;
3766
3767                 dodraw = 0;
3768                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3769                         tsetdirtattr(ATTR_BLINK);
3770                         term.mode ^= MODE_BLINK;
3771                         lastblink = now;
3772                         dodraw = 1;
3773                 }
3774                 deltatime = TIMEDIFF(now, last);
3775                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3776                                 || deltatime < 0) {
3777                         dodraw = 1;
3778                         last = now;
3779                 }
3780
3781                 if(dodraw) {
3782                         while(XPending(xw.dpy)) {
3783                                 XNextEvent(xw.dpy, &ev);
3784                                 if(XFilterEvent(&ev, None))
3785                                         continue;
3786                                 if(handler[ev.type])
3787                                         (handler[ev.type])(&ev);
3788                         }
3789
3790                         draw();
3791                         XFlush(xw.dpy);
3792
3793                         if(xev && !FD_ISSET(xfd, &rfd))
3794                                 xev--;
3795                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3796                                 if(blinkset) {
3797                                         if(TIMEDIFF(now, lastblink) \
3798                                                         > blinktimeout) {
3799                                                 drawtimeout.tv_usec = 1;
3800                                         } else {
3801                                                 drawtimeout.tv_usec = (1000 * \
3802                                                         (blinktimeout - \
3803                                                         TIMEDIFF(now,
3804                                                                 lastblink)));
3805                                         }
3806                                 } else {
3807                                         tv = NULL;
3808                                 }
3809                         }
3810                 }
3811         }
3812 }
3813
3814 void
3815 usage(void) {
3816         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3817         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3818         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3819 }
3820
3821 int
3822 main(int argc, char *argv[]) {
3823         char *titles;
3824         uint cols = 80, rows = 24;
3825
3826         xw.l = xw.t = 0;
3827         xw.isfixed = False;
3828
3829         ARGBEGIN {
3830         case 'a':
3831                 allowaltscreen = false;
3832                 break;
3833         case 'c':
3834                 opt_class = EARGF(usage());
3835                 break;
3836         case 'e':
3837                 /* eat all remaining arguments */
3838                 if(argc > 1) {
3839                         opt_cmd = &argv[1];
3840                         if(argv[1] != NULL && opt_title == NULL) {
3841                                 titles = xstrdup(argv[1]);
3842                                 opt_title = basename(titles);
3843                         }
3844                 }
3845                 goto run;
3846         case 'f':
3847                 opt_font = EARGF(usage());
3848                 break;
3849         case 'g':
3850                 xw.gm = XParseGeometry(EARGF(usage()),
3851                                 &xw.l, &xw.t, &cols, &rows);
3852                 break;
3853         case 'i':
3854                 xw.isfixed = True;
3855                 break;
3856         case 'o':
3857                 opt_io = EARGF(usage());
3858                 break;
3859         case 't':
3860                 opt_title = EARGF(usage());
3861                 break;
3862         case 'w':
3863                 opt_embed = EARGF(usage());
3864                 break;
3865         case 'v':
3866         default:
3867                 usage();
3868         } ARGEND;
3869
3870 run:
3871         setlocale(LC_CTYPE, "");
3872         XSetLocaleModifiers("");
3873         tnew(cols? cols : 1, rows? rows : 1);
3874         xinit();
3875         selinit();
3876         run();
3877
3878         return 0;
3879 }
3880