st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <X11/XKBlib.h>
  31 #include <fontconfig/fontconfig.h>
  32 #include <wchar.h>
  33
  34 #include "arg.h"
  35
  36 char *argv0;
  37
  38 #define Glyph Glyph_
  39 #define Font Font_
  40
  41 #if   defined(__linux)
  42  #include <pty.h>
  43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  44  #include <util.h>
  45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  46  #include <libutil.h>
  47 #endif
  48
  49
  50 /* XEMBED messages */
  51 #define XEMBED_FOCUS_IN  4
  52 #define XEMBED_FOCUS_OUT 5
  53
  54 /* Arbitrary sizes */
  55 #define UTF_INVALID   0xFFFD
  56 #define UTF_SIZ       4
  57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  58 #define ESC_ARG_SIZ   16
  59 #define STR_BUF_SIZ   ESC_BUF_SIZ
  60 #define STR_ARG_SIZ   ESC_ARG_SIZ
  61 #define DRAW_BUF_SIZ  20*1024
  62 #define XK_ANY_MOD    UINT_MAX
  63 #define XK_NO_MOD     0
  64 #define XK_SWITCH_MOD (1<<13)
  65
  66 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  67
  68 /* macros */
  69 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  70 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  71 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  72 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  73 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  74 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  75 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  76 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  77 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  78 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  79 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  80 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  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 enum glyph_attribute {
  91         ATTR_NULL      = 0,
  92         ATTR_BOLD      = 1 << 0,
  93         ATTR_FAINT     = 1 << 1,
  94         ATTR_ITALIC    = 1 << 2,
  95         ATTR_UNDERLINE = 1 << 3,
  96         ATTR_BLINK     = 1 << 4,
  97         ATTR_REVERSE   = 1 << 5,
  98         ATTR_INVISIBLE = 1 << 6,
  99         ATTR_STRUCK    = 1 << 7,
 100         ATTR_WRAP      = 1 << 8,
 101         ATTR_WIDE      = 1 << 9,
 102         ATTR_WDUMMY    = 1 << 10,
 103 };
 104
 105 enum cursor_movement {
 106         CURSOR_SAVE,
 107         CURSOR_LOAD
 108 };
 109
 110 enum cursor_state {
 111         CURSOR_DEFAULT  = 0,
 112         CURSOR_WRAPNEXT = 1,
 113         CURSOR_ORIGIN   = 2
 114 };
 115
 116 enum term_mode {
 117         MODE_WRAP        = 1 << 0,
 118         MODE_INSERT      = 1 << 1,
 119         MODE_APPKEYPAD   = 1 << 2,
 120         MODE_ALTSCREEN   = 1 << 3,
 121         MODE_CRLF        = 1 << 4,
 122         MODE_MOUSEBTN    = 1 << 5,
 123         MODE_MOUSEMOTION = 1 << 6,
 124         MODE_REVERSE     = 1 << 7,
 125         MODE_KBDLOCK     = 1 << 8,
 126         MODE_HIDE        = 1 << 9,
 127         MODE_ECHO        = 1 << 10,
 128         MODE_APPCURSOR   = 1 << 11,
 129         MODE_MOUSESGR    = 1 << 12,
 130         MODE_8BIT        = 1 << 13,
 131         MODE_BLINK       = 1 << 14,
 132         MODE_FBLINK      = 1 << 15,
 133         MODE_FOCUS       = 1 << 16,
 134         MODE_MOUSEX10    = 1 << 17,
 135         MODE_MOUSEMANY   = 1 << 18,
 136         MODE_BRCKTPASTE  = 1 << 19,
 137         MODE_PRINT       = 1 << 20,
 138         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 139                           |MODE_MOUSEMANY,
 140 };
 141
 142 enum charset {
 143         CS_GRAPHIC0,
 144         CS_GRAPHIC1,
 145         CS_UK,
 146         CS_USA,
 147         CS_MULTI,
 148         CS_GER,
 149         CS_FIN
 150 };
 151
 152 enum escape_state {
 153         ESC_START      = 1,
 154         ESC_CSI        = 2,
 155         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 156         ESC_ALTCHARSET = 8,
 157         ESC_STR_END    = 16, /* a final string was encountered */
 158         ESC_TEST       = 32, /* Enter in test mode */
 159 };
 160
 161 enum window_state {
 162         WIN_VISIBLE = 1,
 163         WIN_REDRAW  = 2,
 164         WIN_FOCUSED = 4
 165 };
 166
 167 enum selection_type {
 168         SEL_REGULAR = 1,
 169         SEL_RECTANGULAR = 2
 170 };
 171
 172 enum selection_snap {
 173         SNAP_WORD = 1,
 174         SNAP_LINE = 2
 175 };
 176
 177 typedef unsigned char uchar;
 178 typedef unsigned int uint;
 179 typedef unsigned long ulong;
 180 typedef unsigned short ushort;
 181
 182 typedef XftDraw *Draw;
 183 typedef XftColor Color;
 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         Colormap 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 timespec tclick1;
 299         struct timespec 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 xzoomabs(const Arg *);
 322 static void xzoomreset(const Arg *);
 323 static void printsel(const Arg *);
 324 static void printscreen(const Arg *) ;
 325 static void toggleprinter(const Arg *);
 326
 327 /* Config.h for applying patches and the configuration. */
 328 #include "config.h"
 329
 330 /* Font structure */
 331 typedef struct {
 332         int height;
 333         int width;
 334         int ascent;
 335         int descent;
 336         short lbearing;
 337         short rbearing;
 338         XftFont *match;
 339         FcFontSet *set;
 340         FcPattern *pattern;
 341 } Font;
 342
 343 /* Drawing Context */
 344 typedef struct {
 345         Color col[MAX(LEN(colorname), 256)];
 346         Font font, bfont, ifont, ibfont;
 347         GC gc;
 348 } DC;
 349
 350 static void die(const char *, ...);
 351 static void draw(void);
 352 static void redraw(int);
 353 static void drawregion(int, int, int, int);
 354 static void execsh(void);
 355 static void sigchld(int);
 356 static void run(void);
 357
 358 static void csidump(void);
 359 static void csihandle(void);
 360 static void csiparse(void);
 361 static void csireset(void);
 362 static int eschandle(uchar ascii);
 363 static void strdump(void);
 364 static void strhandle(void);
 365 static void strparse(void);
 366 static void strreset(void);
 367
 368 static int tattrset(int);
 369 static void tprinter(char *, size_t);
 370 static void tdumpsel(void);
 371 static void tdumpline(int);
 372 static void tdump(void);
 373 static void tclearregion(int, int, int, int);
 374 static void tcursor(int);
 375 static void tdeletechar(int);
 376 static void tdeleteline(int);
 377 static void tinsertblank(int);
 378 static void tinsertblankline(int);
 379 static int tlinelen(int);
 380 static void tmoveto(int, int);
 381 static void tmoveato(int, int);
 382 static void tnew(int, int);
 383 static void tnewline(int);
 384 static void tputtab(int);
 385 static void tputc(char *, int);
 386 static void treset(void);
 387 static void tresize(int, int);
 388 static void tscrollup(int, int);
 389 static void tscrolldown(int, int);
 390 static void tsetattr(int *, int);
 391 static void tsetchar(char *, Glyph *, int, int);
 392 static void tsetscroll(int, int);
 393 static void tswapscreen(void);
 394 static void tsetdirt(int, int);
 395 static void tsetdirtattr(int);
 396 static void tsetmode(bool, bool, int *, int);
 397 static void tfulldirt(void);
 398 static void techo(char *, int);
 399 static void tcontrolcode(uchar );
 400 static void tdectest(char );
 401 static int32_t tdefcolor(int *, int *, int);
 402 static void tdeftran(char);
 403 static inline bool match(uint, uint);
 404 static void ttynew(void);
 405 static void ttyread(void);
 406 static void ttyresize(void);
 407 static void ttysend(char *, size_t);
 408 static void ttywrite(const char *, size_t);
 409 static void tstrsequence(uchar c);
 410
 411 static void xdraws(char *, Glyph, int, int, int, int);
 412 static void xhints(void);
 413 static void xclear(int, int, int, int);
 414 static void xdrawcursor(void);
 415 static void xinit(void);
 416 static void xloadcols(void);
 417 static int xsetcolorname(int, const char *);
 418 static int xgeommasktogravity(int);
 419 static int xloadfont(Font *, FcPattern *);
 420 static void xloadfonts(char *, double);
 421 static int xloadfontset(Font *);
 422 static void xsettitle(char *);
 423 static void xresettitle(void);
 424 static void xsetpointermotion(int);
 425 static void xseturgency(int);
 426 static void xsetsel(char *);
 427 static void xtermclear(int, int, int, int);
 428 static void xunloadfont(Font *);
 429 static void xunloadfonts(void);
 430 static void xresize(int, int);
 431
 432 static void expose(XEvent *);
 433 static void visibility(XEvent *);
 434 static void unmap(XEvent *);
 435 static char *kmap(KeySym, uint);
 436 static void kpress(XEvent *);
 437 static void cmessage(XEvent *);
 438 static void cresize(int, int);
 439 static void resize(XEvent *);
 440 static void focus(XEvent *);
 441 static void brelease(XEvent *);
 442 static void bpress(XEvent *);
 443 static void bmotion(XEvent *);
 444 static void selnotify(XEvent *);
 445 static void selclear(XEvent *);
 446 static void selrequest(XEvent *);
 447
 448 static void selinit(void);
 449 static void selnormalize(void);
 450 static inline bool selected(int, int);
 451 static char *getsel(void);
 452 static void selcopy(void);
 453 static void selscroll(int, int);
 454 static void selsnap(int, int *, int *, int);
 455 static void getbuttoninfo(XEvent *);
 456 static void mousereport(XEvent *);
 457
 458 static size_t utf8decode(char *, long *, size_t);
 459 static long utf8decodebyte(char, size_t *);
 460 static size_t utf8encode(long, char *, size_t);
 461 static char utf8encodebyte(long, size_t);
 462 static size_t utf8len(char *);
 463 static size_t utf8validate(long *, size_t);
 464
 465 static ssize_t xwrite(int, const char *, size_t);
 466 static void *xmalloc(size_t);
 467 static void *xrealloc(void *, size_t);
 468 static char *xstrdup(char *);
 469
 470 static void usage(void);
 471
 472 static void (*handler[LASTEvent])(XEvent *) = {
 473         [KeyPress] = kpress,
 474         [ClientMessage] = cmessage,
 475         [ConfigureNotify] = resize,
 476         [VisibilityNotify] = visibility,
 477         [UnmapNotify] = unmap,
 478         [Expose] = expose,
 479         [FocusIn] = focus,
 480         [FocusOut] = focus,
 481         [MotionNotify] = bmotion,
 482         [ButtonPress] = bpress,
 483         [ButtonRelease] = brelease,
 484         [SelectionClear] = selclear,
 485         [SelectionNotify] = selnotify,
 486         [SelectionRequest] = selrequest,
 487 };
 488
 489 /* Globals */
 490 static DC dc;
 491 static XWindow xw;
 492 static Term term;
 493 static CSIEscape csiescseq;
 494 static STREscape strescseq;
 495 static int cmdfd;
 496 static pid_t pid;
 497 static Selection sel;
 498 static int iofd = STDOUT_FILENO;
 499 static char **opt_cmd = NULL;
 500 static char *opt_io = NULL;
 501 static char *opt_title = NULL;
 502 static char *opt_embed = NULL;
 503 static char *opt_class = NULL;
 504 static char *opt_font = NULL;
 505 static int oldbutton = 3; /* button event on startup: 3 = release */
 506
 507 static char *usedfont = NULL;
 508 static double usedfontsize = 0;
 509 static double defaultfontsize = 0;
 510
 511 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 512 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 513 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 514 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 515
 516 /* Font Ring Cache */
 517 enum {
 518         FRC_NORMAL,
 519         FRC_ITALIC,
 520         FRC_BOLD,
 521         FRC_ITALICBOLD
 522 };
 523
 524 typedef struct {
 525         XftFont *font;
 526         int flags;
 527 } Fontcache;
 528
 529 /* Fontcache is an array now. A new font will be appended to the array. */
 530 static Fontcache frc[16];
 531 static int frclen = 0;
 532
 533 ssize_t
 534 xwrite(int fd, const char *s, size_t len) {
 535         size_t aux = len;
 536
 537         while(len > 0) {
 538                 ssize_t r = write(fd, s, len);
 539                 if(r < 0)
 540                         return r;
 541                 len -= r;
 542                 s += r;
 543         }
 544         return aux;
 545 }
 546
 547 void *
 548 xmalloc(size_t len) {
 549         void *p = malloc(len);
 550
 551         if(!p)
 552                 die("Out of memory\n");
 553
 554         return p;
 555 }
 556
 557 void *
 558 xrealloc(void *p, size_t len) {
 559         if((p = realloc(p, len)) == NULL)
 560                 die("Out of memory\n");
 561
 562         return p;
 563 }
 564
 565 char *
 566 xstrdup(char *s) {
 567         if((s = strdup(s)) == NULL)
 568                 die("Out of memory\n");
 569
 570         return s;
 571 }
 572
 573 size_t
 574 utf8decode(char *c, long *u, size_t clen) {
 575         size_t i, j, len, type;
 576         long udecoded;
 577
 578         *u = UTF_INVALID;
 579         if(!clen)
 580                 return 0;
 581         udecoded = utf8decodebyte(c[0], &len);
 582         if(!BETWEEN(len, 1, UTF_SIZ))
 583                 return 1;
 584         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 585                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 586                 if(type != 0)
 587                         return j;
 588         }
 589         if(j < len)
 590                 return 0;
 591         *u = udecoded;
 592         utf8validate(u, len);
 593         return len;
 594 }
 595
 596 long
 597 utf8decodebyte(char c, size_t *i) {
 598         for(*i = 0; *i < LEN(utfmask); ++(*i))
 599                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 600                         return (uchar)c & ~utfmask[*i];
 601         return 0;
 602 }
 603
 604 size_t
 605 utf8encode(long u, char *c, size_t clen) {
 606         size_t len, i;
 607
 608         len = utf8validate(&u, 0);
 609         if(clen < len)
 610                 return 0;
 611         for(i = len - 1; i != 0; --i) {
 612                 c[i] = utf8encodebyte(u, 0);
 613                 u >>= 6;
 614         }
 615         c[0] = utf8encodebyte(u, len);
 616         return len;
 617 }
 618
 619 char
 620 utf8encodebyte(long u, size_t i) {
 621         return utfbyte[i] | (u & ~utfmask[i]);
 622 }
 623
 624 size_t
 625 utf8len(char *c) {
 626         return utf8decode(c, &(long){0}, UTF_SIZ);
 627 }
 628
 629 size_t
 630 utf8validate(long *u, size_t i) {
 631         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 632                 *u = UTF_INVALID;
 633         for(i = 1; *u > utfmax[i]; ++i)
 634                 ;
 635         return i;
 636 }
 637
 638 static void
 639 selinit(void) {
 640         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 641         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 642         sel.mode = 0;
 643         sel.ob.x = -1;
 644         sel.clip = NULL;
 645         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 646         if(sel.xtarget == None)
 647                 sel.xtarget = XA_STRING;
 648 }
 649
 650 static int
 651 x2col(int x) {
 652         x -= borderpx;
 653         x /= xw.cw;
 654
 655         return LIMIT(x, 0, term.col-1);
 656 }
 657
 658 static int
 659 y2row(int y) {
 660         y -= borderpx;
 661         y /= xw.ch;
 662
 663         return LIMIT(y, 0, term.row-1);
 664 }
 665
 666 static int tlinelen(int y) {
 667         int i = term.col;
 668
 669         if(term.line[y][i - 1].mode & ATTR_WRAP)
 670                 return i;
 671
 672         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
 673                 --i;
 674
 675         return i;
 676 }
 677
 678 static void
 679 selnormalize(void) {
 680         int i;
 681
 682         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 683                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 684                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 685         } else {
 686                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 687                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 688         }
 689         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 690         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 691
 692         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
 693         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
 694
 695         /* expand selection over line breaks */
 696         if (sel.type == SEL_RECTANGULAR)
 697                 return;
 698         i = tlinelen(sel.nb.y);
 699         if (i < sel.nb.x)
 700                 sel.nb.x = i;
 701         if (tlinelen(sel.ne.y) <= sel.ne.x)
 702                 sel.ne.x = term.col - 1;
 703 }
 704
 705 static inline bool
 706 selected(int x, int y) {
 707         if(sel.type == SEL_RECTANGULAR)
 708                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 709                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 710
 711         return BETWEEN(y, sel.nb.y, sel.ne.y)
 712             && (y != sel.nb.y || x >= sel.nb.x)
 713             && (y != sel.ne.y || x <= sel.ne.x);
 714 }
 715
 716 void
 717 selsnap(int mode, int *x, int *y, int direction) {
 718         int newx, newy, xt, yt;
 719         bool delim, prevdelim;
 720         Glyph *gp, *prevgp;
 721
 722         switch(mode) {
 723         case SNAP_WORD:
 724                 /*
 725                  * Snap around if the word wraps around at the end or
 726                  * beginning of a line.
 727                  */
 728                 prevgp = &term.line[*y][*x];
 729                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
 730                 for(;;) {
 731                         newx = *x + direction;
 732                         newy = *y;
 733                         if(!BETWEEN(newx, 0, term.col - 1)) {
 734                                 newy += direction;
 735                                 newx = (newx + term.col) % term.col;
 736                                 if (!BETWEEN(newy, 0, term.row - 1))
 737                                         break;
 738
 739                                 if(direction > 0)
 740                                         yt = *y, xt = *x;
 741                                 else
 742                                         yt = newy, xt = newx;
 743                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 744                                         break;
 745                         }
 746
 747                         if (newx >= tlinelen(newy))
 748                                 break;
 749
 750                         gp = &term.line[newy][newx];
 751                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
 752                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 753                                         || (delim && gp->c[0] != prevgp->c[0])))
 754                                 break;
 755
 756                         *x = newx;
 757                         *y = newy;
 758                         prevgp = gp;
 759                         prevdelim = delim;
 760                 }
 761                 break;
 762         case SNAP_LINE:
 763                 /*
 764                  * Snap around if the the previous line or the current one
 765                  * has set ATTR_WRAP at its end. Then the whole next or
 766                  * previous line will be selected.
 767                  */
 768                 *x = (direction < 0) ? 0 : term.col - 1;
 769                 if(direction < 0 && *y > 0) {
 770                         for(; *y > 0; *y += direction) {
 771                                 if(!(term.line[*y-1][term.col-1].mode
 772                                                 & ATTR_WRAP)) {
 773                                         break;
 774                                 }
 775                         }
 776                 } else if(direction > 0 && *y < term.row-1) {
 777                         for(; *y < term.row; *y += direction) {
 778                                 if(!(term.line[*y][term.col-1].mode
 779                                                 & ATTR_WRAP)) {
 780                                         break;
 781                                 }
 782                         }
 783                 }
 784                 break;
 785         }
 786 }
 787
 788 void
 789 getbuttoninfo(XEvent *e) {
 790         int type;
 791         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 792
 793         sel.alt = IS_SET(MODE_ALTSCREEN);
 794
 795         sel.oe.x = x2col(e->xbutton.x);
 796         sel.oe.y = y2row(e->xbutton.y);
 797         selnormalize();
 798
 799         sel.type = SEL_REGULAR;
 800         for(type = 1; type < LEN(selmasks); ++type) {
 801                 if(match(selmasks[type], state)) {
 802                         sel.type = type;
 803                         break;
 804                 }
 805         }
 806 }
 807
 808 void
 809 mousereport(XEvent *e) {
 810         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 811             button = e->xbutton.button, state = e->xbutton.state,
 812             len;
 813         char buf[40];
 814         static int ox, oy;
 815
 816         /* from urxvt */
 817         if(e->xbutton.type == MotionNotify) {
 818                 if(x == ox && y == oy)
 819                         return;
 820                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 821                         return;
 822                 /* MOUSE_MOTION: no reporting if no button is pressed */
 823                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 824                         return;
 825
 826                 button = oldbutton + 32;
 827                 ox = x;
 828                 oy = y;
 829         } else {
 830                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 831                         button = 3;
 832                 } else {
 833                         button -= Button1;
 834                         if(button >= 3)
 835                                 button += 64 - 3;
 836                 }
 837                 if(e->xbutton.type == ButtonPress) {
 838                         oldbutton = button;
 839                         ox = x;
 840                         oy = y;
 841                 } else if(e->xbutton.type == ButtonRelease) {
 842                         oldbutton = 3;
 843                         /* MODE_MOUSEX10: no button release reporting */
 844                         if(IS_SET(MODE_MOUSEX10))
 845                                 return;
 846                         if (button == 64 || button == 65)
 847                                 return;
 848                 }
 849         }
 850
 851         if(!IS_SET(MODE_MOUSEX10)) {
 852                 button += (state & ShiftMask   ? 4  : 0)
 853                         + (state & Mod4Mask    ? 8  : 0)
 854                         + (state & ControlMask ? 16 : 0);
 855         }
 856
 857         len = 0;
 858         if(IS_SET(MODE_MOUSESGR)) {
 859                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 860                                 button, x+1, y+1,
 861                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 862         } else if(x < 223 && y < 223) {
 863                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 864                                 32+button, 32+x+1, 32+y+1);
 865         } else {
 866                 return;
 867         }
 868
 869         ttywrite(buf, len);
 870 }
 871
 872 void
 873 bpress(XEvent *e) {
 874         struct timespec now;
 875         Mousekey *mk;
 876
 877         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 878                 mousereport(e);
 879                 return;
 880         }
 881
 882         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 883                 if(e->xbutton.button == mk->b
 884                                 && match(mk->mask, e->xbutton.state)) {
 885                         ttysend(mk->s, strlen(mk->s));
 886                         return;
 887                 }
 888         }
 889
 890         if(e->xbutton.button == Button1) {
 891                 clock_gettime(CLOCK_MONOTONIC, &now);
 892
 893                 /* Clear previous selection, logically and visually. */
 894                 selclear(NULL);
 895                 sel.mode = 1;
 896                 sel.type = SEL_REGULAR;
 897                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 898                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 899
 900                 /*
 901                  * If the user clicks below predefined timeouts specific
 902                  * snapping behaviour is exposed.
 903                  */
 904                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 905                         sel.snap = SNAP_LINE;
 906                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 907                         sel.snap = SNAP_WORD;
 908                 } else {
 909                         sel.snap = 0;
 910                 }
 911                 selnormalize();
 912
 913                 /*
 914                  * Draw selection, unless it's regular and we don't want to
 915                  * make clicks visible
 916                  */
 917                 if(sel.snap != 0) {
 918                         sel.mode++;
 919                         tsetdirt(sel.nb.y, sel.ne.y);
 920                 }
 921                 sel.tclick2 = sel.tclick1;
 922                 sel.tclick1 = now;
 923         }
 924 }
 925
 926 char *
 927 getsel(void) {
 928         char *str, *ptr;
 929         int y, bufsize, size, lastx, linelen;
 930         Glyph *gp, *last;
 931
 932         if(sel.ob.x == -1)
 933                 return NULL;
 934
 935         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 936         ptr = str = xmalloc(bufsize);
 937
 938         /* append every set & selected glyph to the selection */
 939         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 940                 linelen = tlinelen(y);
 941
 942                 if(sel.type == SEL_RECTANGULAR) {
 943                         gp = &term.line[y][sel.nb.x];
 944                         lastx = sel.ne.x;
 945                 } else {
 946                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 947                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 948                 }
 949                 last = &term.line[y][MIN(lastx, linelen-1)];
 950
 951                 for( ; gp <= last; ++gp) {
 952                         if(gp->mode & ATTR_WDUMMY)
 953                                 continue;
 954
 955                         size = utf8len(gp->c);
 956                         memcpy(ptr, gp->c, size);
 957                         ptr += size;
 958                 }
 959
 960                 /*
 961                  * Copy and pasting of line endings is inconsistent
 962                  * in the inconsistent terminal and GUI world.
 963                  * The best solution seems like to produce '\n' when
 964                  * something is copied from st and convert '\n' to
 965                  * '\r', when something to be pasted is received by
 966                  * st.
 967                  * FIXME: Fix the computer world.
 968                  */
 969                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 970                         *ptr++ = '\n';
 971         }
 972         *ptr = 0;
 973         return str;
 974 }
 975
 976 void
 977 selcopy(void) {
 978         xsetsel(getsel());
 979 }
 980
 981 void
 982 selnotify(XEvent *e) {
 983         ulong nitems, ofs, rem;
 984         int format;
 985         uchar *data, *last, *repl;
 986         Atom type;
 987
 988         ofs = 0;
 989         do {
 990                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 991                                         False, AnyPropertyType, &type, &format,
 992                                         &nitems, &rem, &data)) {
 993                         fprintf(stderr, "Clipboard allocation failed\n");
 994                         return;
 995                 }
 996
 997                 /*
 998                  * As seen in getsel:
 999                  * Line endings are inconsistent in the terminal and GUI world
1000                  * copy and pasting. When receiving some selection data,
1001                  * replace all '\n' with '\r'.
1002                  * FIXME: Fix the computer world.
1003                  */
1004                 repl = data;
1005                 last = data + nitems * format / 8;
1006                 while((repl = memchr(repl, '\n', last - repl))) {
1007                         *repl++ = '\r';
1008                 }
1009
1010                 if(IS_SET(MODE_BRCKTPASTE))
1011                         ttywrite("\033[200~", 6);
1012                 ttysend((char *)data, nitems * format / 8);
1013                 if(IS_SET(MODE_BRCKTPASTE))
1014                         ttywrite("\033[201~", 6);
1015                 XFree(data);
1016                 /* number of 32-bit chunks returned */
1017                 ofs += nitems * format / 32;
1018         } while(rem > 0);
1019 }
1020
1021 void
1022 selpaste(const Arg *dummy) {
1023         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1024                         xw.win, CurrentTime);
1025 }
1026
1027 void
1028 clippaste(const Arg *dummy) {
1029         Atom clipboard;
1030
1031         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1032         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1033                         xw.win, CurrentTime);
1034 }
1035
1036 void
1037 selclear(XEvent *e) {
1038         if(sel.ob.x == -1)
1039                 return;
1040         sel.ob.x = -1;
1041         tsetdirt(sel.nb.y, sel.ne.y);
1042 }
1043
1044 void
1045 selrequest(XEvent *e) {
1046         XSelectionRequestEvent *xsre;
1047         XSelectionEvent xev;
1048         Atom xa_targets, string;
1049
1050         xsre = (XSelectionRequestEvent *) e;
1051         xev.type = SelectionNotify;
1052         xev.requestor = xsre->requestor;
1053         xev.selection = xsre->selection;
1054         xev.target = xsre->target;
1055         xev.time = xsre->time;
1056         /* reject */
1057         xev.property = None;
1058
1059         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1060         if(xsre->target == xa_targets) {
1061                 /* respond with the supported type */
1062                 string = sel.xtarget;
1063                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1064                                 XA_ATOM, 32, PropModeReplace,
1065                                 (uchar *) &string, 1);
1066                 xev.property = xsre->property;
1067         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1068                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1069                                 xsre->target, 8, PropModeReplace,
1070                                 (uchar *) sel.clip, strlen(sel.clip));
1071                 xev.property = xsre->property;
1072         }
1073
1074         /* all done, send a notification to the listener */
1075         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1076                 fprintf(stderr, "Error sending SelectionNotify event\n");
1077 }
1078
1079 void
1080 xsetsel(char *str) {
1081         /* register the selection for both the clipboard and the primary */
1082         Atom clipboard;
1083
1084         free(sel.clip);
1085         sel.clip = str;
1086
1087         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1088
1089         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1090         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1091 }
1092
1093 void
1094 brelease(XEvent *e) {
1095         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1096                 mousereport(e);
1097                 return;
1098         }
1099
1100         if(e->xbutton.button == Button2) {
1101                 selpaste(NULL);
1102         } else if(e->xbutton.button == Button1) {
1103                 if(sel.mode < 2) {
1104                         selclear(NULL);
1105                 } else {
1106                         getbuttoninfo(e);
1107                         selcopy();
1108                 }
1109                 sel.mode = 0;
1110                 tsetdirt(sel.nb.y, sel.ne.y);
1111         }
1112 }
1113
1114 void
1115 bmotion(XEvent *e) {
1116         int oldey, oldex, oldsby, oldsey;
1117
1118         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1119                 mousereport(e);
1120                 return;
1121         }
1122
1123         if(!sel.mode)
1124                 return;
1125
1126         sel.mode++;
1127         oldey = sel.oe.y;
1128         oldex = sel.oe.x;
1129         oldsby = sel.nb.y;
1130         oldsey = sel.ne.y;
1131         getbuttoninfo(e);
1132
1133         if(oldey != sel.oe.y || oldex != sel.oe.x)
1134                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1135 }
1136
1137 void
1138 die(const char *errstr, ...) {
1139         va_list ap;
1140
1141         va_start(ap, errstr);
1142         vfprintf(stderr, errstr, ap);
1143         va_end(ap);
1144         exit(EXIT_FAILURE);
1145 }
1146
1147 void
1148 execsh(void) {
1149         char **args, *sh, *prog;
1150         const struct passwd *pw;
1151         char buf[sizeof(long) * 8 + 1];
1152
1153         errno = 0;
1154         if((pw = getpwuid(getuid())) == NULL) {
1155                 if(errno)
1156                         die("getpwuid:%s\n", strerror(errno));
1157                 else
1158                         die("who are you?\n");
1159         }
1160
1161         if (!(sh = getenv("SHELL"))) {
1162                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1163         }
1164
1165         if(opt_cmd)
1166                 prog = opt_cmd[0];
1167         else if(utmp)
1168                 prog = utmp;
1169         else
1170                 prog = sh;
1171         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1172
1173         snprintf(buf, sizeof(buf), "%lu", xw.win);
1174
1175         unsetenv("COLUMNS");
1176         unsetenv("LINES");
1177         unsetenv("TERMCAP");
1178         setenv("LOGNAME", pw->pw_name, 1);
1179         setenv("USER", pw->pw_name, 1);
1180         setenv("SHELL", sh, 1);
1181         setenv("HOME", pw->pw_dir, 1);
1182         setenv("TERM", termname, 1);
1183         setenv("WINDOWID", buf, 1);
1184
1185         signal(SIGCHLD, SIG_DFL);
1186         signal(SIGHUP, SIG_DFL);
1187         signal(SIGINT, SIG_DFL);
1188         signal(SIGQUIT, SIG_DFL);
1189         signal(SIGTERM, SIG_DFL);
1190         signal(SIGALRM, SIG_DFL);
1191
1192         execvp(prog, args);
1193         exit(EXIT_FAILURE);
1194 }
1195
1196 void
1197 sigchld(int a) {
1198         int stat, ret;
1199
1200         if(waitpid(pid, &stat, 0) < 0)
1201                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1202
1203         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1204         if (ret != EXIT_SUCCESS)
1205                 die("child finished with error '%d'\n", stat);
1206         exit(EXIT_SUCCESS);
1207 }
1208
1209 void
1210 ttynew(void) {
1211         int m, s;
1212         struct winsize w = {term.row, term.col, 0, 0};
1213
1214         /* seems to work fine on linux, openbsd and freebsd */
1215         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1216                 die("openpty failed: %s\n", strerror(errno));
1217
1218         switch(pid = fork()) {
1219         case -1:
1220                 die("fork failed\n");
1221                 break;
1222         case 0:
1223                 setsid(); /* create a new process group */
1224                 dup2(s, STDIN_FILENO);
1225                 dup2(s, STDOUT_FILENO);
1226                 dup2(s, STDERR_FILENO);
1227                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1228                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1229                 close(s);
1230                 close(m);
1231                 execsh();
1232                 break;
1233         default:
1234                 close(s);
1235                 cmdfd = m;
1236                 signal(SIGCHLD, sigchld);
1237                 if(opt_io) {
1238                         term.mode |= MODE_PRINT;
1239                         iofd = (!strcmp(opt_io, "-")) ?
1240                                   STDOUT_FILENO :
1241                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1242                         if(iofd < 0) {
1243                                 fprintf(stderr, "Error opening %s:%s\n",
1244                                         opt_io, strerror(errno));
1245                         }
1246                 }
1247                 break;
1248         }
1249 }
1250
1251 void
1252 ttyread(void) {
1253         static char buf[BUFSIZ];
1254         static int buflen = 0;
1255         char *ptr;
1256         char s[UTF_SIZ];
1257         int charsize; /* size of utf8 char in bytes */
1258         long unicodep;
1259         int ret;
1260
1261         /* append read bytes to unprocessed bytes */
1262         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1263                 die("Couldn't read from shell: %s\n", strerror(errno));
1264
1265         /* process every complete utf8 char */
1266         buflen += ret;
1267         ptr = buf;
1268         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1269                 utf8encode(unicodep, s, UTF_SIZ);
1270                 tputc(s, charsize);
1271                 ptr += charsize;
1272                 buflen -= charsize;
1273         }
1274
1275         /* keep any uncomplete utf8 char for the next call */
1276         memmove(buf, ptr, buflen);
1277 }
1278
1279 void
1280 ttywrite(const char *s, size_t n) {
1281         if(xwrite(cmdfd, s, n) == -1)
1282                 die("write error on tty: %s\n", strerror(errno));
1283 }
1284
1285 void
1286 ttysend(char *s, size_t n) {
1287         ttywrite(s, n);
1288         if(IS_SET(MODE_ECHO))
1289                 techo(s, n);
1290 }
1291
1292 void
1293 ttyresize(void) {
1294         struct winsize w;
1295
1296         w.ws_row = term.row;
1297         w.ws_col = term.col;
1298         w.ws_xpixel = xw.tw;
1299         w.ws_ypixel = xw.th;
1300         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1301                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1302 }
1303
1304 int
1305 tattrset(int attr) {
1306         int i, j;
1307
1308         for(i = 0; i < term.row-1; i++) {
1309                 for(j = 0; j < term.col-1; j++) {
1310                         if(term.line[i][j].mode & attr)
1311                                 return 1;
1312                 }
1313         }
1314
1315         return 0;
1316 }
1317
1318 void
1319 tsetdirt(int top, int bot) {
1320         int i;
1321
1322         LIMIT(top, 0, term.row-1);
1323         LIMIT(bot, 0, term.row-1);
1324
1325         for(i = top; i <= bot; i++)
1326                 term.dirty[i] = 1;
1327 }
1328
1329 void
1330 tsetdirtattr(int attr) {
1331         int i, j;
1332
1333         for(i = 0; i < term.row-1; i++) {
1334                 for(j = 0; j < term.col-1; j++) {
1335                         if(term.line[i][j].mode & attr) {
1336                                 tsetdirt(i, i);
1337                                 break;
1338                         }
1339                 }
1340         }
1341 }
1342
1343 void
1344 tfulldirt(void) {
1345         tsetdirt(0, term.row-1);
1346 }
1347
1348 void
1349 tcursor(int mode) {
1350         static TCursor c[2];
1351         bool alt = IS_SET(MODE_ALTSCREEN);
1352
1353         if(mode == CURSOR_SAVE) {
1354                 c[alt] = term.c;
1355         } else if(mode == CURSOR_LOAD) {
1356                 term.c = c[alt];
1357                 tmoveto(c[alt].x, c[alt].y);
1358         }
1359 }
1360
1361 void
1362 treset(void) {
1363         uint i;
1364
1365         term.c = (TCursor){{
1366                 .mode = ATTR_NULL,
1367                 .fg = defaultfg,
1368                 .bg = defaultbg
1369         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1370
1371         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1372         for(i = tabspaces; i < term.col; i += tabspaces)
1373                 term.tabs[i] = 1;
1374         term.top = 0;
1375         term.bot = term.row - 1;
1376         term.mode = MODE_WRAP;
1377         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1378         term.charset = 0;
1379
1380         for(i = 0; i < 2; i++) {
1381                 tmoveto(0, 0);
1382                 tcursor(CURSOR_SAVE);
1383                 tclearregion(0, 0, term.col-1, term.row-1);
1384                 tswapscreen();
1385         }
1386 }
1387
1388 void
1389 tnew(int col, int row) {
1390         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1391         tresize(col, row);
1392         term.numlock = 1;
1393
1394         treset();
1395 }
1396
1397 void
1398 tswapscreen(void) {
1399         Line *tmp = term.line;
1400
1401         term.line = term.alt;
1402         term.alt = tmp;
1403         term.mode ^= MODE_ALTSCREEN;
1404         tfulldirt();
1405 }
1406
1407 void
1408 tscrolldown(int orig, int n) {
1409         int i;
1410         Line temp;
1411
1412         LIMIT(n, 0, term.bot-orig+1);
1413
1414         tsetdirt(orig, term.bot-n);
1415         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1416
1417         for(i = term.bot; i >= orig+n; i--) {
1418                 temp = term.line[i];
1419                 term.line[i] = term.line[i-n];
1420                 term.line[i-n] = temp;
1421         }
1422
1423         selscroll(orig, n);
1424 }
1425
1426 void
1427 tscrollup(int orig, int n) {
1428         int i;
1429         Line temp;
1430
1431         LIMIT(n, 0, term.bot-orig+1);
1432
1433         tclearregion(0, orig, term.col-1, orig+n-1);
1434         tsetdirt(orig+n, term.bot);
1435
1436         for(i = orig; i <= term.bot-n; i++) {
1437                 temp = term.line[i];
1438                 term.line[i] = term.line[i+n];
1439                 term.line[i+n] = temp;
1440         }
1441
1442         selscroll(orig, -n);
1443 }
1444
1445 void
1446 selscroll(int orig, int n) {
1447         if(sel.ob.x == -1)
1448                 return;
1449
1450         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1451                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1452                         selclear(NULL);
1453                         return;
1454                 }
1455                 if(sel.type == SEL_RECTANGULAR) {
1456                         if(sel.ob.y < term.top)
1457                                 sel.ob.y = term.top;
1458                         if(sel.oe.y > term.bot)
1459                                 sel.oe.y = term.bot;
1460                 } else {
1461                         if(sel.ob.y < term.top) {
1462                                 sel.ob.y = term.top;
1463                                 sel.ob.x = 0;
1464                         }
1465                         if(sel.oe.y > term.bot) {
1466                                 sel.oe.y = term.bot;
1467                                 sel.oe.x = term.col;
1468                         }
1469                 }
1470                 selnormalize();
1471         }
1472 }
1473
1474 void
1475 tnewline(int first_col) {
1476         int y = term.c.y;
1477
1478         if(y == term.bot) {
1479                 tscrollup(term.top, 1);
1480         } else {
1481                 y++;
1482         }
1483         tmoveto(first_col ? 0 : term.c.x, y);
1484 }
1485
1486 void
1487 csiparse(void) {
1488         char *p = csiescseq.buf, *np;
1489         long int v;
1490
1491         csiescseq.narg = 0;
1492         if(*p == '?') {
1493                 csiescseq.priv = 1;
1494                 p++;
1495         }
1496
1497         csiescseq.buf[csiescseq.len] = '\0';
1498         while(p < csiescseq.buf+csiescseq.len) {
1499                 np = NULL;
1500                 v = strtol(p, &np, 10);
1501                 if(np == p)
1502                         v = 0;
1503                 if(v == LONG_MAX || v == LONG_MIN)
1504                         v = -1;
1505                 csiescseq.arg[csiescseq.narg++] = v;
1506                 p = np;
1507                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1508                         break;
1509                 p++;
1510         }
1511         csiescseq.mode = *p;
1512 }
1513
1514 /* for absolute user moves, when decom is set */
1515 void
1516 tmoveato(int x, int y) {
1517         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1518 }
1519
1520 void
1521 tmoveto(int x, int y) {
1522         int miny, maxy;
1523
1524         if(term.c.state & CURSOR_ORIGIN) {
1525                 miny = term.top;
1526                 maxy = term.bot;
1527         } else {
1528                 miny = 0;
1529                 maxy = term.row - 1;
1530         }
1531         LIMIT(x, 0, term.col-1);
1532         LIMIT(y, miny, maxy);
1533         term.c.state &= ~CURSOR_WRAPNEXT;
1534         term.c.x = x;
1535         term.c.y = y;
1536 }
1537
1538 void
1539 tsetchar(char *c, Glyph *attr, int x, int y) {
1540         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1541                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1542                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1543                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1544                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1545                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1546                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1547                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1548                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1549         };
1550
1551         /*
1552          * The table is proudly stolen from rxvt.
1553          */
1554         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1555                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1556                         c = vt100_0[c[0] - 0x41];
1557                 }
1558         }
1559
1560         if(term.line[y][x].mode & ATTR_WIDE) {
1561                 if(x+1 < term.col) {
1562                         term.line[y][x+1].c[0] = ' ';
1563                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1564                 }
1565         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1566                 term.line[y][x-1].c[0] = ' ';
1567                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1568         }
1569
1570         term.dirty[y] = 1;
1571         term.line[y][x] = *attr;
1572         memcpy(term.line[y][x].c, c, UTF_SIZ);
1573 }
1574
1575 void
1576 tclearregion(int x1, int y1, int x2, int y2) {
1577         int x, y, temp;
1578         Glyph *gp;
1579
1580         if(x1 > x2)
1581                 temp = x1, x1 = x2, x2 = temp;
1582         if(y1 > y2)
1583                 temp = y1, y1 = y2, y2 = temp;
1584
1585         LIMIT(x1, 0, term.col-1);
1586         LIMIT(x2, 0, term.col-1);
1587         LIMIT(y1, 0, term.row-1);
1588         LIMIT(y2, 0, term.row-1);
1589
1590         for(y = y1; y <= y2; y++) {
1591                 term.dirty[y] = 1;
1592                 for(x = x1; x <= x2; x++) {
1593                         gp = &term.line[y][x];
1594                         if(selected(x, y))
1595                                 selclear(NULL);
1596                         gp->fg = term.c.attr.fg;
1597                         gp->bg = term.c.attr.bg;
1598                         gp->mode = 0;
1599                         memcpy(gp->c, " ", 2);
1600                 }
1601         }
1602 }
1603
1604 void
1605 tdeletechar(int n) {
1606         int dst, src, size;
1607         Glyph *line;
1608
1609         LIMIT(n, 0, term.col - term.c.x);
1610
1611         dst = term.c.x;
1612         src = term.c.x + n;
1613         size = term.col - src;
1614         line = term.line[term.c.y];
1615
1616         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1617         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1618 }
1619
1620 void
1621 tinsertblank(int n) {
1622         int dst, src, size;
1623         Glyph *line;
1624
1625         LIMIT(n, 0, term.col - term.c.x);
1626
1627         dst = term.c.x + n;
1628         src = term.c.x;
1629         size = term.col - dst;
1630         line = term.line[term.c.y];
1631
1632         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1633         tclearregion(src, term.c.y, dst - 1, term.c.y);
1634 }
1635
1636 void
1637 tinsertblankline(int n) {
1638         if(BETWEEN(term.c.y, term.top, term.bot))
1639                 tscrolldown(term.c.y, n);
1640 }
1641
1642 void
1643 tdeleteline(int n) {
1644         if(BETWEEN(term.c.y, term.top, term.bot))
1645                 tscrollup(term.c.y, n);
1646 }
1647
1648 int32_t
1649 tdefcolor(int *attr, int *npar, int l) {
1650         int32_t idx = -1;
1651         uint r, g, b;
1652
1653         switch (attr[*npar + 1]) {
1654         case 2: /* direct color in RGB space */
1655                 if (*npar + 4 >= l) {
1656                         fprintf(stderr,
1657                                 "erresc(38): Incorrect number of parameters (%d)\n",
1658                                 *npar);
1659                         break;
1660                 }
1661                 r = attr[*npar + 2];
1662                 g = attr[*npar + 3];
1663                 b = attr[*npar + 4];
1664                 *npar += 4;
1665                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1666                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1667                                 r, g, b);
1668                 else
1669                         idx = TRUECOLOR(r, g, b);
1670                 break;
1671         case 5: /* indexed color */
1672                 if (*npar + 2 >= l) {
1673                         fprintf(stderr,
1674                                 "erresc(38): Incorrect number of parameters (%d)\n",
1675                                 *npar);
1676                         break;
1677                 }
1678                 *npar += 2;
1679                 if(!BETWEEN(attr[*npar], 0, 255))
1680                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1681                 else
1682                         idx = attr[*npar];
1683                 break;
1684         case 0: /* implemented defined (only foreground) */
1685         case 1: /* transparent */
1686         case 3: /* direct color in CMY space */
1687         case 4: /* direct color in CMYK space */
1688         default:
1689                 fprintf(stderr,
1690                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1691                 break;
1692         }
1693
1694         return idx;
1695 }
1696
1697 void
1698 tsetattr(int *attr, int l) {
1699         int i;
1700         int32_t idx;
1701
1702         for(i = 0; i < l; i++) {
1703                 switch(attr[i]) {
1704                 case 0:
1705                         term.c.attr.mode &= ~(
1706                                 ATTR_BOLD       |
1707                                 ATTR_FAINT      |
1708                                 ATTR_ITALIC     |
1709                                 ATTR_UNDERLINE  |
1710                                 ATTR_BLINK      |
1711                                 ATTR_REVERSE    |
1712                                 ATTR_INVISIBLE  |
1713                                 ATTR_STRUCK     );
1714                         term.c.attr.fg = defaultfg;
1715                         term.c.attr.bg = defaultbg;
1716                         break;
1717                 case 1:
1718                         term.c.attr.mode |= ATTR_BOLD;
1719                         break;
1720                 case 2:
1721                         term.c.attr.mode |= ATTR_FAINT;
1722                         break;
1723                 case 3:
1724                         term.c.attr.mode |= ATTR_ITALIC;
1725                         break;
1726                 case 4:
1727                         term.c.attr.mode |= ATTR_UNDERLINE;
1728                         break;
1729                 case 5: /* slow blink */
1730                         /* FALLTHROUGH */
1731                 case 6: /* rapid blink */
1732                         term.c.attr.mode |= ATTR_BLINK;
1733                         break;
1734                 case 7:
1735                         term.c.attr.mode |= ATTR_REVERSE;
1736                         break;
1737                 case 8:
1738                         term.c.attr.mode |= ATTR_INVISIBLE;
1739                         break;
1740                 case 9:
1741                         term.c.attr.mode |= ATTR_STRUCK;
1742                         break;
1743                 case 22:
1744                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1745                         break;
1746                 case 23:
1747                         term.c.attr.mode &= ~ATTR_ITALIC;
1748                         break;
1749                 case 24:
1750                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1751                         break;
1752                 case 25:
1753                         term.c.attr.mode &= ~ATTR_BLINK;
1754                         break;
1755                 case 27:
1756                         term.c.attr.mode &= ~ATTR_REVERSE;
1757                         break;
1758                 case 28:
1759                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1760                         break;
1761                 case 29:
1762                         term.c.attr.mode &= ~ATTR_STRUCK;
1763                         break;
1764                 case 38:
1765                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1766                                 term.c.attr.fg = idx;
1767                         break;
1768                 case 39:
1769                         term.c.attr.fg = defaultfg;
1770                         break;
1771                 case 48:
1772                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1773                                 term.c.attr.bg = idx;
1774                         break;
1775                 case 49:
1776                         term.c.attr.bg = defaultbg;
1777                         break;
1778                 default:
1779                         if(BETWEEN(attr[i], 30, 37)) {
1780                                 term.c.attr.fg = attr[i] - 30;
1781                         } else if(BETWEEN(attr[i], 40, 47)) {
1782                                 term.c.attr.bg = attr[i] - 40;
1783                         } else if(BETWEEN(attr[i], 90, 97)) {
1784                                 term.c.attr.fg = attr[i] - 90 + 8;
1785                         } else if(BETWEEN(attr[i], 100, 107)) {
1786                                 term.c.attr.bg = attr[i] - 100 + 8;
1787                         } else {
1788                                 fprintf(stderr,
1789                                         "erresc(default): gfx attr %d unknown\n",
1790                                         attr[i]), csidump();
1791                         }
1792                         break;
1793                 }
1794         }
1795 }
1796
1797 void
1798 tsetscroll(int t, int b) {
1799         int temp;
1800
1801         LIMIT(t, 0, term.row-1);
1802         LIMIT(b, 0, term.row-1);
1803         if(t > b) {
1804                 temp = t;
1805                 t = b;
1806                 b = temp;
1807         }
1808         term.top = t;
1809         term.bot = b;
1810 }
1811
1812 void
1813 tsetmode(bool priv, bool set, int *args, int narg) {
1814         int *lim, mode;
1815         bool alt;
1816
1817         for(lim = args + narg; args < lim; ++args) {
1818                 if(priv) {
1819                         switch(*args) {
1820                         case 1: /* DECCKM -- Cursor key */
1821                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1822                                 break;
1823                         case 5: /* DECSCNM -- Reverse video */
1824                                 mode = term.mode;
1825                                 MODBIT(term.mode, set, MODE_REVERSE);
1826                                 if(mode != term.mode)
1827                                         redraw(REDRAW_TIMEOUT);
1828                                 break;
1829                         case 6: /* DECOM -- Origin */
1830                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1831                                 tmoveato(0, 0);
1832                                 break;
1833                         case 7: /* DECAWM -- Auto wrap */
1834                                 MODBIT(term.mode, set, MODE_WRAP);
1835                                 break;
1836                         case 0:  /* Error (IGNORED) */
1837                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1838                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1839                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1840                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1841                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1842                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1843                         case 42: /* DECNRCM -- National characters (IGNORED) */
1844                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1845                                 break;
1846                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1847                                 MODBIT(term.mode, !set, MODE_HIDE);
1848                                 break;
1849                         case 9:    /* X10 mouse compatibility mode */
1850                                 xsetpointermotion(0);
1851                                 MODBIT(term.mode, 0, MODE_MOUSE);
1852                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1853                                 break;
1854                         case 1000: /* 1000: report button press */
1855                                 xsetpointermotion(0);
1856                                 MODBIT(term.mode, 0, MODE_MOUSE);
1857                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1858                                 break;
1859                         case 1002: /* 1002: report motion on button press */
1860                                 xsetpointermotion(0);
1861                                 MODBIT(term.mode, 0, MODE_MOUSE);
1862                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1863                                 break;
1864                         case 1003: /* 1003: enable all mouse motions */
1865                                 xsetpointermotion(set);
1866                                 MODBIT(term.mode, 0, MODE_MOUSE);
1867                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1868                                 break;
1869                         case 1004: /* 1004: send focus events to tty */
1870                                 MODBIT(term.mode, set, MODE_FOCUS);
1871                                 break;
1872                         case 1006: /* 1006: extended reporting mode */
1873                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1874                                 break;
1875                         case 1034:
1876                                 MODBIT(term.mode, set, MODE_8BIT);
1877                                 break;
1878                         case 1049: /* swap screen & set/restore cursor as xterm */
1879                                 if (!allowaltscreen)
1880                                         break;
1881                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1882                                 /* FALLTHROUGH */
1883                         case 47: /* swap screen */
1884                         case 1047:
1885                                 if (!allowaltscreen)
1886                                         break;
1887                                 alt = IS_SET(MODE_ALTSCREEN);
1888                                 if(alt) {
1889                                         tclearregion(0, 0, term.col-1,
1890                                                         term.row-1);
1891                                 }
1892                                 if(set ^ alt) /* set is always 1 or 0 */
1893                                         tswapscreen();
1894                                 if(*args != 1049)
1895                                         break;
1896                                 /* FALLTHROUGH */
1897                         case 1048:
1898                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1899                                 break;
1900                         case 2004: /* 2004: bracketed paste mode */
1901                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1902                                 break;
1903                         /* Not implemented mouse modes. See comments there. */
1904                         case 1001: /* mouse highlight mode; can hang the
1905                                       terminal by design when implemented. */
1906                         case 1005: /* UTF-8 mouse mode; will confuse
1907                                       applications not supporting UTF-8
1908                                       and luit. */
1909                         case 1015: /* urxvt mangled mouse mode; incompatible
1910                                       and can be mistaken for other control
1911                                       codes. */
1912                         default:
1913                                 fprintf(stderr,
1914                                         "erresc: unknown private set/reset mode %d\n",
1915                                         *args);
1916                                 break;
1917                         }
1918                 } else {
1919                         switch(*args) {
1920                         case 0:  /* Error (IGNORED) */
1921                                 break;
1922                         case 2:  /* KAM -- keyboard action */
1923                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1924                                 break;
1925                         case 4:  /* IRM -- Insertion-replacement */
1926                                 MODBIT(term.mode, set, MODE_INSERT);
1927                                 break;
1928                         case 12: /* SRM -- Send/Receive */
1929                                 MODBIT(term.mode, !set, MODE_ECHO);
1930                                 break;
1931                         case 20: /* LNM -- Linefeed/new line */
1932                                 MODBIT(term.mode, set, MODE_CRLF);
1933                                 break;
1934                         default:
1935                                 fprintf(stderr,
1936                                         "erresc: unknown set/reset mode %d\n",
1937                                         *args);
1938                                 break;
1939                         }
1940                 }
1941         }
1942 }
1943
1944 void
1945 csihandle(void) {
1946         char buf[40];
1947         int len;
1948
1949         switch(csiescseq.mode) {
1950         default:
1951         unknown:
1952                 fprintf(stderr, "erresc: unknown csi ");
1953                 csidump();
1954                 /* die(""); */
1955                 break;
1956         case '@': /* ICH -- Insert <n> blank char */
1957                 DEFAULT(csiescseq.arg[0], 1);
1958                 tinsertblank(csiescseq.arg[0]);
1959                 break;
1960         case 'A': /* CUU -- Cursor <n> Up */
1961                 DEFAULT(csiescseq.arg[0], 1);
1962                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1963                 break;
1964         case 'B': /* CUD -- Cursor <n> Down */
1965         case 'e': /* VPR --Cursor <n> Down */
1966                 DEFAULT(csiescseq.arg[0], 1);
1967                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1968                 break;
1969         case 'i': /* MC -- Media Copy */
1970                 switch(csiescseq.arg[0]) {
1971                 case 0:
1972                         tdump();
1973                         break;
1974                 case 1:
1975                         tdumpline(term.c.y);
1976                         break;
1977                 case 2:
1978                         tdumpsel();
1979                         break;
1980                 case 4:
1981                         term.mode &= ~MODE_PRINT;
1982                         break;
1983                 case 5:
1984                         term.mode |= MODE_PRINT;
1985                         break;
1986                 }
1987                 break;
1988         case 'c': /* DA -- Device Attributes */
1989                 if(csiescseq.arg[0] == 0)
1990                         ttywrite(vtiden, sizeof(vtiden) - 1);
1991                 break;
1992         case 'C': /* CUF -- Cursor <n> Forward */
1993         case 'a': /* HPR -- Cursor <n> Forward */
1994                 DEFAULT(csiescseq.arg[0], 1);
1995                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1996                 break;
1997         case 'D': /* CUB -- Cursor <n> Backward */
1998                 DEFAULT(csiescseq.arg[0], 1);
1999                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2000                 break;
2001         case 'E': /* CNL -- Cursor <n> Down and first col */
2002                 DEFAULT(csiescseq.arg[0], 1);
2003                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2004                 break;
2005         case 'F': /* CPL -- Cursor <n> Up and first col */
2006                 DEFAULT(csiescseq.arg[0], 1);
2007                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2008                 break;
2009         case 'g': /* TBC -- Tabulation clear */
2010                 switch(csiescseq.arg[0]) {
2011                 case 0: /* clear current tab stop */
2012                         term.tabs[term.c.x] = 0;
2013                         break;
2014                 case 3: /* clear all the tabs */
2015                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2016                         break;
2017                 default:
2018                         goto unknown;
2019                 }
2020                 break;
2021         case 'G': /* CHA -- Move to <col> */
2022         case '`': /* HPA */
2023                 DEFAULT(csiescseq.arg[0], 1);
2024                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2025                 break;
2026         case 'H': /* CUP -- Move to <row> <col> */
2027         case 'f': /* HVP */
2028                 DEFAULT(csiescseq.arg[0], 1);
2029                 DEFAULT(csiescseq.arg[1], 1);
2030                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2031                 break;
2032         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2033                 DEFAULT(csiescseq.arg[0], 1);
2034                 tputtab(csiescseq.arg[0]);
2035                 break;
2036         case 'J': /* ED -- Clear screen */
2037                 selclear(NULL);
2038                 switch(csiescseq.arg[0]) {
2039                 case 0: /* below */
2040                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2041                         if(term.c.y < term.row-1) {
2042                                 tclearregion(0, term.c.y+1, term.col-1,
2043                                                 term.row-1);
2044                         }
2045                         break;
2046                 case 1: /* above */
2047                         if(term.c.y > 1)
2048                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2049                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2050                         break;
2051                 case 2: /* all */
2052                         tclearregion(0, 0, term.col-1, term.row-1);
2053                         break;
2054                 default:
2055                         goto unknown;
2056                 }
2057                 break;
2058         case 'K': /* EL -- Clear line */
2059                 switch(csiescseq.arg[0]) {
2060                 case 0: /* right */
2061                         tclearregion(term.c.x, term.c.y, term.col-1,
2062                                         term.c.y);
2063                         break;
2064                 case 1: /* left */
2065                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2066                         break;
2067                 case 2: /* all */
2068                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2069                         break;
2070                 }
2071                 break;
2072         case 'S': /* SU -- Scroll <n> line up */
2073                 DEFAULT(csiescseq.arg[0], 1);
2074                 tscrollup(term.top, csiescseq.arg[0]);
2075                 break;
2076         case 'T': /* SD -- Scroll <n> line down */
2077                 DEFAULT(csiescseq.arg[0], 1);
2078                 tscrolldown(term.top, csiescseq.arg[0]);
2079                 break;
2080         case 'L': /* IL -- Insert <n> blank lines */
2081                 DEFAULT(csiescseq.arg[0], 1);
2082                 tinsertblankline(csiescseq.arg[0]);
2083                 break;
2084         case 'l': /* RM -- Reset Mode */
2085                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2086                 break;
2087         case 'M': /* DL -- Delete <n> lines */
2088                 DEFAULT(csiescseq.arg[0], 1);
2089                 tdeleteline(csiescseq.arg[0]);
2090                 break;
2091         case 'X': /* ECH -- Erase <n> char */
2092                 DEFAULT(csiescseq.arg[0], 1);
2093                 tclearregion(term.c.x, term.c.y,
2094                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2095                 break;
2096         case 'P': /* DCH -- Delete <n> char */
2097                 DEFAULT(csiescseq.arg[0], 1);
2098                 tdeletechar(csiescseq.arg[0]);
2099                 break;
2100         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2101                 DEFAULT(csiescseq.arg[0], 1);
2102                 tputtab(-csiescseq.arg[0]);
2103                 break;
2104         case 'd': /* VPA -- Move to <row> */
2105                 DEFAULT(csiescseq.arg[0], 1);
2106                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2107                 break;
2108         case 'h': /* SM -- Set terminal mode */
2109                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2110                 break;
2111         case 'm': /* SGR -- Terminal attribute (color) */
2112                 tsetattr(csiescseq.arg, csiescseq.narg);
2113                 break;
2114         case 'n': /* DSR – Device Status Report (cursor position) */
2115                 if (csiescseq.arg[0] == 6) {
2116                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2117                                         term.c.y+1, term.c.x+1);
2118                         ttywrite(buf, len);
2119                 }
2120                 break;
2121         case 'r': /* DECSTBM -- Set Scrolling Region */
2122                 if(csiescseq.priv) {
2123                         goto unknown;
2124                 } else {
2125                         DEFAULT(csiescseq.arg[0], 1);
2126                         DEFAULT(csiescseq.arg[1], term.row);
2127                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2128                         tmoveato(0, 0);
2129                 }
2130                 break;
2131         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2132                 tcursor(CURSOR_SAVE);
2133                 break;
2134         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2135                 tcursor(CURSOR_LOAD);
2136                 break;
2137         }
2138 }
2139
2140 void
2141 csidump(void) {
2142         int i;
2143         uint c;
2144
2145         printf("ESC[");
2146         for(i = 0; i < csiescseq.len; i++) {
2147                 c = csiescseq.buf[i] & 0xff;
2148                 if(isprint(c)) {
2149                         putchar(c);
2150                 } else if(c == '\n') {
2151                         printf("(\\n)");
2152                 } else if(c == '\r') {
2153                         printf("(\\r)");
2154                 } else if(c == 0x1b) {
2155                         printf("(\\e)");
2156                 } else {
2157                         printf("(%02x)", c);
2158                 }
2159         }
2160         putchar('\n');
2161 }
2162
2163 void
2164 csireset(void) {
2165         memset(&csiescseq, 0, sizeof(csiescseq));
2166 }
2167
2168 void
2169 strhandle(void) {
2170         char *p = NULL;
2171         int j, narg, par;
2172
2173         term.esc &= ~(ESC_STR_END|ESC_STR);
2174         strparse();
2175         narg = strescseq.narg;
2176         par = atoi(strescseq.args[0]);
2177
2178         switch(strescseq.type) {
2179         case ']': /* OSC -- Operating System Command */
2180                 switch(par) {
2181                 case 0:
2182                 case 1:
2183                 case 2:
2184                         if(narg > 1)
2185                                 xsettitle(strescseq.args[1]);
2186                         return;
2187                 case 4: /* color set */
2188                         if(narg < 3)
2189                                 break;
2190                         p = strescseq.args[2];
2191                         /* FALLTHROUGH */
2192                 case 104: /* color reset, here p = NULL */
2193                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2194                         if(xsetcolorname(j, p)) {
2195                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2196                         } else {
2197                                 /*
2198                                  * TODO if defaultbg color is changed, borders
2199                                  * are dirty
2200                                  */
2201                                 redraw(0);
2202                         }
2203                         return;
2204                 }
2205                 break;
2206         case 'k': /* old title set compatibility */
2207                 xsettitle(strescseq.args[0]);
2208                 return;
2209         case 'P': /* DCS -- Device Control String */
2210         case '_': /* APC -- Application Program Command */
2211         case '^': /* PM -- Privacy Message */
2212                 return;
2213         }
2214
2215         fprintf(stderr, "erresc: unknown str ");
2216         strdump();
2217 }
2218
2219 void
2220 strparse(void) {
2221         char *p = strescseq.buf;
2222
2223         strescseq.narg = 0;
2224         strescseq.buf[strescseq.len] = '\0';
2225         while(p && strescseq.narg < STR_ARG_SIZ)
2226                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2227 }
2228
2229 void
2230 strdump(void) {
2231         int i;
2232         uint c;
2233
2234         printf("ESC%c", strescseq.type);
2235         for(i = 0; i < strescseq.len; i++) {
2236                 c = strescseq.buf[i] & 0xff;
2237                 if(c == '\0') {
2238                         return;
2239                 } else if(isprint(c)) {
2240                         putchar(c);
2241                 } else if(c == '\n') {
2242                         printf("(\\n)");
2243                 } else if(c == '\r') {
2244                         printf("(\\r)");
2245                 } else if(c == 0x1b) {
2246                         printf("(\\e)");
2247                 } else {
2248                         printf("(%02x)", c);
2249                 }
2250         }
2251         printf("ESC\\\n");
2252 }
2253
2254 void
2255 strreset(void) {
2256         memset(&strescseq, 0, sizeof(strescseq));
2257 }
2258
2259 void
2260 tprinter(char *s, size_t len) {
2261         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2262                 fprintf(stderr, "Error writing in %s:%s\n",
2263                         opt_io, strerror(errno));
2264                 close(iofd);
2265                 iofd = -1;
2266         }
2267 }
2268
2269 void
2270 toggleprinter(const Arg *arg) {
2271         term.mode ^= MODE_PRINT;
2272 }
2273
2274 void
2275 printscreen(const Arg *arg) {
2276         tdump();
2277 }
2278
2279 void
2280 printsel(const Arg *arg) {
2281         tdumpsel();
2282 }
2283
2284 void
2285 tdumpsel(void) {
2286         char *ptr;
2287
2288         if((ptr = getsel())) {
2289                 tprinter(ptr, strlen(ptr));
2290                 free(ptr);
2291         }
2292 }
2293
2294 void
2295 tdumpline(int n) {
2296         Glyph *bp, *end;
2297
2298         bp = &term.line[n][0];
2299         end = &bp[MIN(tlinelen(n), term.col) - 1];
2300         if(bp != end || bp->c[0] != ' ') {
2301                 for( ;bp <= end; ++bp)
2302                         tprinter(bp->c, utf8len(bp->c));
2303         }
2304         tprinter("\n", 1);
2305 }
2306
2307 void
2308 tdump(void) {
2309         int i;
2310
2311         for(i = 0; i < term.row; ++i)
2312                 tdumpline(i);
2313 }
2314
2315 void
2316 tputtab(int n) {
2317         uint x = term.c.x;
2318
2319         if(n > 0) {
2320                 while(x < term.col && n--)
2321                         for(++x; x < term.col && !term.tabs[x]; ++x)
2322                                 /* nothing */ ;
2323         } else if(n < 0) {
2324                 while(x > 0 && n++)
2325                         for(--x; x > 0 && !term.tabs[x]; --x)
2326                                 /* nothing */ ;
2327         }
2328         tmoveto(x, term.c.y);
2329 }
2330
2331 void
2332 techo(char *buf, int len) {
2333         for(; len > 0; buf++, len--) {
2334                 char c = *buf;
2335
2336                 if(ISCONTROL((uchar) c)) { /* control code */
2337                         if(c & 0x80) {
2338                                 c &= 0x7f;
2339                                 tputc("^", 1);
2340                                 tputc("[", 1);
2341                         } else if(c != '\n' && c != '\r' && c != '\t') {
2342                                 c ^= 0x40;
2343                                 tputc("^", 1);
2344                         }
2345                         tputc(&c, 1);
2346                 } else {
2347                         break;
2348                 }
2349         }
2350         if(len)
2351                 tputc(buf, len);
2352 }
2353
2354 void
2355 tdeftran(char ascii) {
2356         static char cs[] = "0B";
2357         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2358         char *p;
2359
2360         if((p = strchr(cs, ascii)) == NULL) {
2361                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2362         } else {
2363                 term.trantbl[term.icharset] = vcs[p - cs];
2364         }
2365 }
2366
2367 void
2368 tdectest(char c) {
2369         static char E[UTF_SIZ] = "E";
2370         int x, y;
2371
2372         if(c == '8') { /* DEC screen alignment test. */
2373                 for(x = 0; x < term.col; ++x) {
2374                         for(y = 0; y < term.row; ++y)
2375                                 tsetchar(E, &term.c.attr, x, y);
2376                 }
2377         }
2378 }
2379
2380 void
2381 tstrsequence(uchar c) {
2382         if (c & 0x80) {
2383                 switch (c) {
2384                 case 0x90:   /* DCS -- Device Control String */
2385                         c = 'P';
2386                         break;
2387                 case 0x9f:   /* APC -- Application Program Command */
2388                         c = '_';
2389                         break;
2390                 case 0x9e:   /* PM -- Privacy Message */
2391                         c = '^';
2392                         break;
2393                 case 0x9d:   /* OSC -- Operating System Command */
2394                         c = ']';
2395                         break;
2396                 }
2397         }
2398         strreset();
2399         strescseq.type = c;
2400         term.esc |= ESC_STR;
2401         return;
2402 }
2403
2404 void
2405 tcontrolcode(uchar ascii) {
2406         static char question[UTF_SIZ] = "?";
2407
2408         switch(ascii) {
2409         case '\t':   /* HT */
2410                 tputtab(1);
2411                 return;
2412         case '\b':   /* BS */
2413                 tmoveto(term.c.x-1, term.c.y);
2414                 return;
2415         case '\r':   /* CR */
2416                 tmoveto(0, term.c.y);
2417                 return;
2418         case '\f':   /* LF */
2419         case '\v':   /* VT */
2420         case '\n':   /* LF */
2421                 /* go to first col if the mode is set */
2422                 tnewline(IS_SET(MODE_CRLF));
2423                 return;
2424         case '\a':   /* BEL */
2425                 if(term.esc & ESC_STR_END) {
2426                         /* backwards compatibility to xterm */
2427                         strhandle();
2428                 } else {
2429                         if(!(xw.state & WIN_FOCUSED))
2430                                 xseturgency(1);
2431                         if (bellvolume)
2432                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2433                 }
2434                 break;
2435         case '\033': /* ESC */
2436                 csireset();
2437                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2438                 term.esc |= ESC_START;
2439                 return;
2440         case '\016': /* SO (LS1 -- Locking shift 1) */
2441         case '\017': /* SI (LS0 -- Locking shift 0) */
2442                 term.charset = 1 - (ascii - '\016');
2443                 return;
2444         case '\032': /* SUB */
2445                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2446         case '\030': /* CAN */
2447                 csireset();
2448                 break;
2449         case '\005': /* ENQ (IGNORED) */
2450         case '\000': /* NUL (IGNORED) */
2451         case '\021': /* XON (IGNORED) */
2452         case '\023': /* XOFF (IGNORED) */
2453         case 0177:   /* DEL (IGNORED) */
2454                 return;
2455         case 0x84:   /* TODO: IND */
2456                 break;
2457         case 0x85:   /* NEL -- Next line */
2458                 tnewline(1); /* always go to first col */
2459                 break;
2460         case 0x88:   /* HTS -- Horizontal tab stop */
2461                 term.tabs[term.c.x] = 1;
2462                 break;
2463         case 0x8d:   /* TODO: RI */
2464         case 0x8e:   /* TODO: SS2 */
2465         case 0x8f:   /* TODO: SS3 */
2466         case 0x98:   /* TODO: SOS */
2467                 break;
2468         case 0x9a:   /* DECID -- Identify Terminal */
2469                 ttywrite(vtiden, sizeof(vtiden) - 1);
2470                 break;
2471         case 0x9b:   /* TODO: CSI */
2472         case 0x9c:   /* TODO: ST */
2473                 break;
2474         case 0x90:   /* DCS -- Device Control String */
2475         case 0x9f:   /* APC -- Application Program Command */
2476         case 0x9e:   /* PM -- Privacy Message */
2477         case 0x9d:   /* OSC -- Operating System Command */
2478                 tstrsequence(ascii);
2479                 return;
2480         }
2481         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2482         term.esc &= ~(ESC_STR_END|ESC_STR);
2483         return;
2484 }
2485
2486 /*
2487  * returns 1 when the sequence is finished and it hasn't to read
2488  * more characters for this sequence, otherwise 0
2489  */
2490 int
2491 eschandle(uchar ascii) {
2492         switch(ascii) {
2493         case '[':
2494                 term.esc |= ESC_CSI;
2495                 return 0;
2496         case '#':
2497                 term.esc |= ESC_TEST;
2498                 return 0;
2499         case 'P': /* DCS -- Device Control String */
2500         case '_': /* APC -- Application Program Command */
2501         case '^': /* PM -- Privacy Message */
2502         case ']': /* OSC -- Operating System Command */
2503         case 'k': /* old title set compatibility */
2504                 tstrsequence(ascii);
2505                 return 0;
2506         case 'n': /* LS2 -- Locking shift 2 */
2507         case 'o': /* LS3 -- Locking shift 3 */
2508                 term.charset = 2 + (ascii - 'n');
2509                 break;
2510         case '(': /* GZD4 -- set primary charset G0 */
2511         case ')': /* G1D4 -- set secondary charset G1 */
2512         case '*': /* G2D4 -- set tertiary charset G2 */
2513         case '+': /* G3D4 -- set quaternary charset G3 */
2514                 term.icharset = ascii - '(';
2515                 term.esc |= ESC_ALTCHARSET;
2516                 return 0;
2517         case 'D': /* IND -- Linefeed */
2518                 if(term.c.y == term.bot) {
2519                         tscrollup(term.top, 1);
2520                 } else {
2521                         tmoveto(term.c.x, term.c.y+1);
2522                 }
2523                 break;
2524         case 'E': /* NEL -- Next line */
2525                 tnewline(1); /* always go to first col */
2526                 break;
2527         case 'H': /* HTS -- Horizontal tab stop */
2528                 term.tabs[term.c.x] = 1;
2529                 break;
2530         case 'M': /* RI -- Reverse index */
2531                 if(term.c.y == term.top) {
2532                         tscrolldown(term.top, 1);
2533                 } else {
2534                         tmoveto(term.c.x, term.c.y-1);
2535                 }
2536                 break;
2537         case 'Z': /* DECID -- Identify Terminal */
2538                 ttywrite(vtiden, sizeof(vtiden) - 1);
2539                 break;
2540         case 'c': /* RIS -- Reset to inital state */
2541                 treset();
2542                 xresettitle();
2543                 xloadcols();
2544                 break;
2545         case '=': /* DECPAM -- Application keypad */
2546                 term.mode |= MODE_APPKEYPAD;
2547                 break;
2548         case '>': /* DECPNM -- Normal keypad */
2549                 term.mode &= ~MODE_APPKEYPAD;
2550                 break;
2551         case '7': /* DECSC -- Save Cursor */
2552                 tcursor(CURSOR_SAVE);
2553                 break;
2554         case '8': /* DECRC -- Restore Cursor */
2555                 tcursor(CURSOR_LOAD);
2556                 break;
2557         case '\\': /* ST -- String Terminator */
2558                 if(term.esc & ESC_STR_END)
2559                         strhandle();
2560                 break;
2561         default:
2562                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2563                         (uchar) ascii, isprint(ascii)? ascii:'.');
2564                 break;
2565         }
2566         return 1;
2567 }
2568
2569 void
2570 tputc(char *c, int len) {
2571         uchar ascii;
2572         bool control;
2573         long unicodep;
2574         int width;
2575         Glyph *gp;
2576
2577         if(len == 1) {
2578                 width = 1;
2579                 unicodep = ascii = *c;
2580         } else {
2581                 utf8decode(c, &unicodep, UTF_SIZ);
2582                 if ((width = wcwidth(unicodep)) == -1) {
2583                         c = "\357\277\275";     /* UTF_INVALID */
2584                         width = 1;
2585                 }
2586                 control = ISCONTROLC1(unicodep);
2587                 ascii = unicodep;
2588         }
2589
2590         if(IS_SET(MODE_PRINT))
2591                 tprinter(c, len);
2592         control = ISCONTROL(unicodep);
2593
2594         /*
2595          * STR sequence must be checked before anything else
2596          * because it uses all following characters until it
2597          * receives a ESC, a SUB, a ST or any other C1 control
2598          * character.
2599          */
2600         if(term.esc & ESC_STR) {
2601                 if(width == 1 &&
2602                    (ascii == '\a' || ascii == 030 ||
2603                     ascii == 032  || ascii == 033 ||
2604                     ISCONTROLC1(unicodep))) {
2605                         term.esc &= ~(ESC_START|ESC_STR);
2606                         term.esc |= ESC_STR_END;
2607                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2608                         memmove(&strescseq.buf[strescseq.len], c, len);
2609                         strescseq.len += len;
2610                         return;
2611                 } else {
2612                 /*
2613                  * Here is a bug in terminals. If the user never sends
2614                  * some code to stop the str or esc command, then st
2615                  * will stop responding. But this is better than
2616                  * silently failing with unknown characters. At least
2617                  * then users will report back.
2618                  *
2619                  * In the case users ever get fixed, here is the code:
2620                  */
2621                 /*
2622                  * term.esc = 0;
2623                  * strhandle();
2624                  */
2625                         return;
2626                 }
2627         }
2628
2629         /*
2630          * Actions of control codes must be performed as soon they arrive
2631          * because they can be embedded inside a control sequence, and
2632          * they must not cause conflicts with sequences.
2633          */
2634         if(control) {
2635                 tcontrolcode(ascii);
2636                 /*
2637                  * control codes are not shown ever
2638                  */
2639                 return;
2640         } else if(term.esc & ESC_START) {
2641                 if(term.esc & ESC_CSI) {
2642                         csiescseq.buf[csiescseq.len++] = ascii;
2643                         if(BETWEEN(ascii, 0x40, 0x7E)
2644                                         || csiescseq.len >= \
2645                                         sizeof(csiescseq.buf)-1) {
2646                                 term.esc = 0;
2647                                 csiparse();
2648                                 csihandle();
2649                         }
2650                         return;
2651                 } else if(term.esc & ESC_ALTCHARSET) {
2652                         tdeftran(ascii);
2653                 } else if(term.esc & ESC_TEST) {
2654                         tdectest(ascii);
2655                 } else {
2656                         if (!eschandle(ascii))
2657                                 return;
2658                         /* sequence already finished */
2659                 }
2660                 term.esc = 0;
2661                 /*
2662                  * All characters which form part of a sequence are not
2663                  * printed
2664                  */
2665                 return;
2666         }
2667         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2668                 selclear(NULL);
2669
2670         gp = &term.line[term.c.y][term.c.x];
2671         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2672                 gp->mode |= ATTR_WRAP;
2673                 tnewline(1);
2674         }
2675
2676         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2677                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2678
2679         if(term.c.x+width > term.col)
2680                 tnewline(1);
2681
2682         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2683
2684         if(width == 2) {
2685                 gp->mode |= ATTR_WIDE;
2686                 if(term.c.x+1 < term.col) {
2687                         gp[1].c[0] = '\0';
2688                         gp[1].mode = ATTR_WDUMMY;
2689                 }
2690         }
2691         if(term.c.x+width < term.col) {
2692                 tmoveto(term.c.x+width, term.c.y);
2693         } else {
2694                 term.c.state |= CURSOR_WRAPNEXT;
2695         }
2696 }
2697
2698 void
2699 tresize(int col, int row) {
2700         int i;
2701         int minrow = MIN(row, term.row);
2702         int mincol = MIN(col, term.col);
2703         int slide = term.c.y - row + 1;
2704         bool *bp;
2705         TCursor c;
2706
2707         if(col < 1 || row < 1) {
2708                 fprintf(stderr,
2709                         "tresize: error resizing to %dx%d\n", col, row);
2710                 return;
2711         }
2712
2713         /* free unneeded rows */
2714         i = 0;
2715         if(slide > 0) {
2716                 /*
2717                  * slide screen to keep cursor where we expect it -
2718                  * tscrollup would work here, but we can optimize to
2719                  * memmove because we're freeing the earlier lines
2720                  */
2721                 for(/* i = 0 */; i < slide; i++) {
2722                         free(term.line[i]);
2723                         free(term.alt[i]);
2724                 }
2725                 memmove(term.line, term.line + slide, row * sizeof(Line));
2726                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2727         }
2728         for(i += row; i < term.row; i++) {
2729                 free(term.line[i]);
2730                 free(term.alt[i]);
2731         }
2732
2733         /* resize to new height */
2734         term.line = xrealloc(term.line, row * sizeof(Line));
2735         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2736         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2737         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2738
2739         /* resize each row to new width, zero-pad if needed */
2740         for(i = 0; i < minrow; i++) {
2741                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2742                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2743         }
2744
2745         /* allocate any new rows */
2746         for(/* i == minrow */; i < row; i++) {
2747                 term.line[i] = xmalloc(col * sizeof(Glyph));
2748                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2749         }
2750         if(col > term.col) {
2751                 bp = term.tabs + term.col;
2752
2753                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2754                 while(--bp > term.tabs && !*bp)
2755                         /* nothing */ ;
2756                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2757                         *bp = 1;
2758         }
2759         /* update terminal size */
2760         term.col = col;
2761         term.row = row;
2762         /* reset scrolling region */
2763         tsetscroll(0, row-1);
2764         /* make use of the LIMIT in tmoveto */
2765         tmoveto(term.c.x, term.c.y);
2766         /* Clearing both screens (it makes dirty all lines) */
2767         c = term.c;
2768         for(i = 0; i < 2; i++) {
2769                 if(mincol < col && 0 < minrow) {
2770                         tclearregion(mincol, 0, col - 1, minrow - 1);
2771                 }
2772                 if(0 < col && minrow < row) {
2773                         tclearregion(0, minrow, col - 1, row - 1);
2774                 }
2775                 tswapscreen();
2776                 tcursor(CURSOR_LOAD);
2777         }
2778         term.c = c;
2779 }
2780
2781 void
2782 xresize(int col, int row) {
2783         xw.tw = MAX(1, col * xw.cw);
2784         xw.th = MAX(1, row * xw.ch);
2785
2786         XFreePixmap(xw.dpy, xw.buf);
2787         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2788                         DefaultDepth(xw.dpy, xw.scr));
2789         XftDrawChange(xw.draw, xw.buf);
2790         xclear(0, 0, xw.w, xw.h);
2791 }
2792
2793 static inline ushort
2794 sixd_to_16bit(int x) {
2795         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2796 }
2797
2798 void
2799 xloadcols(void) {
2800         int i;
2801         XRenderColor color = { .alpha = 0xffff };
2802         static bool loaded;
2803         Color *cp;
2804
2805         if(loaded) {
2806                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2807                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2808         }
2809
2810         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2811         for(i = 0; i < LEN(colorname); i++) {
2812                 if(!colorname[i])
2813                         continue;
2814                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2815                         die("Could not allocate color '%s'\n", colorname[i]);
2816                 }
2817         }
2818
2819         /* load colors [16-231] ; same colors as xterm */
2820         for(i = 16; i < 6*6*6+16; i++) {
2821                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2822                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2823                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2824                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2825                         die("Could not allocate color %d\n", i);
2826         }
2827
2828         /* load colors [232-255] ; grayscale */
2829         for(; i < 256; i++) {
2830                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2831                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2832                         die("Could not allocate color %d\n", i);
2833         }
2834         loaded = true;
2835 }
2836
2837 int
2838 xsetcolorname(int x, const char *name) {
2839         XRenderColor color = { .alpha = 0xffff };
2840         Color ncolor;
2841
2842         if(!BETWEEN(x, 0, LEN(colorname)))
2843                 return 1;
2844
2845         if(!name) {
2846                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2847                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2848                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2849                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2850                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2851                                                 xw.cmap, &color, &ncolor)) {
2852                                 return 1;
2853                         }
2854
2855                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2856                         dc.col[x] = ncolor;
2857                         return 0;
2858                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2859                         color.red = color.green = color.blue = \
2860                                     0x0808 + 0x0a0a * (x - (16 + 216));
2861                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2862                                                 xw.cmap, &color, &ncolor)) {
2863                                 return 1;
2864                         }
2865
2866                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2867                         dc.col[x] = ncolor;
2868                         return 0;
2869                 } else { /* system colors */
2870                         name = colorname[x];
2871                 }
2872         }
2873         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2874                 return 1;
2875
2876         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2877         dc.col[x] = ncolor;
2878         return 0;
2879 }
2880
2881 void
2882 xtermclear(int col1, int row1, int col2, int row2) {
2883         XftDrawRect(xw.draw,
2884                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2885                         borderpx + col1 * xw.cw,
2886                         borderpx + row1 * xw.ch,
2887                         (col2-col1+1) * xw.cw,
2888                         (row2-row1+1) * xw.ch);
2889 }
2890
2891 /*
2892  * Absolute coordinates.
2893  */
2894 void
2895 xclear(int x1, int y1, int x2, int y2) {
2896         XftDrawRect(xw.draw,
2897                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2898                         x1, y1, x2-x1, y2-y1);
2899 }
2900
2901 void
2902 xhints(void) {
2903         XClassHint class = {opt_class ? opt_class : termname, termname};
2904         XWMHints wm = {.flags = InputHint, .input = 1};
2905         XSizeHints *sizeh = NULL;
2906
2907         sizeh = XAllocSizeHints();
2908
2909         sizeh->flags = PSize | PResizeInc | PBaseSize;
2910         sizeh->height = xw.h;
2911         sizeh->width = xw.w;
2912         sizeh->height_inc = xw.ch;
2913         sizeh->width_inc = xw.cw;
2914         sizeh->base_height = 2 * borderpx;
2915         sizeh->base_width = 2 * borderpx;
2916         if(xw.isfixed == True) {
2917                 sizeh->flags |= PMaxSize | PMinSize;
2918                 sizeh->min_width = sizeh->max_width = xw.w;
2919                 sizeh->min_height = sizeh->max_height = xw.h;
2920         }
2921         if(xw.gm & (XValue|YValue)) {
2922                 sizeh->flags |= USPosition | PWinGravity;
2923                 sizeh->x = xw.l;
2924                 sizeh->y = xw.t;
2925                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2926         }
2927
2928         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2929                         &class);
2930         XFree(sizeh);
2931 }
2932
2933 int
2934 xgeommasktogravity(int mask) {
2935         switch(mask & (XNegative|YNegative)) {
2936         case 0:
2937                 return NorthWestGravity;
2938         case XNegative:
2939                 return NorthEastGravity;
2940         case YNegative:
2941                 return SouthWestGravity;
2942         }
2943         return SouthEastGravity;
2944 }
2945
2946 int
2947 xloadfont(Font *f, FcPattern *pattern) {
2948         FcPattern *match;
2949         FcResult result;
2950
2951         match = FcFontMatch(NULL, pattern, &result);
2952         if(!match)
2953                 return 1;
2954
2955         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2956                 FcPatternDestroy(match);
2957                 return 1;
2958         }
2959
2960         f->set = NULL;
2961         f->pattern = FcPatternDuplicate(pattern);
2962
2963         f->ascent = f->match->ascent;
2964         f->descent = f->match->descent;
2965         f->lbearing = 0;
2966         f->rbearing = f->match->max_advance_width;
2967
2968         f->height = f->ascent + f->descent;
2969         f->width = f->lbearing + f->rbearing;
2970
2971         return 0;
2972 }
2973
2974 void
2975 xloadfonts(char *fontstr, double fontsize) {
2976         FcPattern *pattern;
2977         FcResult r_sz, r_psz;
2978         double fontval;
2979         float ceilf(float);
2980
2981         if(fontstr[0] == '-') {
2982                 pattern = XftXlfdParse(fontstr, False, False);
2983         } else {
2984                 pattern = FcNameParse((FcChar8 *)fontstr);
2985         }
2986
2987         if(!pattern)
2988                 die("st: can't open font %s\n", fontstr);
2989
2990         if(fontsize > 0) {
2991                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2992                 FcPatternDel(pattern, FC_SIZE);
2993                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2994                 usedfontsize = fontsize;
2995         } else {
2996                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2997                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2998                 if(r_psz == FcResultMatch) {
2999                         usedfontsize = fontval;
3000                 } else if(r_sz == FcResultMatch) {
3001                         usedfontsize = -1;
3002                 } else {
3003                         /*
3004                          * Default font size is 12, if none given. This is to
3005                          * have a known usedfontsize value.
3006                          */
3007                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3008                         usedfontsize = 12;
3009                 }
3010                 defaultfontsize = usedfontsize;
3011         }
3012
3013         FcConfigSubstitute(0, pattern, FcMatchPattern);
3014         FcDefaultSubstitute(pattern);
3015
3016         if(xloadfont(&dc.font, pattern))
3017                 die("st: can't open font %s\n", fontstr);
3018
3019         if(usedfontsize < 0) {
3020                 FcPatternGetDouble(dc.font.match->pattern,
3021                                    FC_PIXEL_SIZE, 0, &fontval);
3022                 usedfontsize = fontval;
3023                 if(fontsize == 0)
3024                         defaultfontsize = fontval;
3025         }
3026
3027         /* Setting character width and height. */
3028         xw.cw = ceilf(dc.font.width * cwscale);
3029         xw.ch = ceilf(dc.font.height * chscale);
3030
3031         FcPatternDel(pattern, FC_SLANT);
3032         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3033         if(xloadfont(&dc.ifont, pattern))
3034                 die("st: can't open font %s\n", fontstr);
3035
3036         FcPatternDel(pattern, FC_WEIGHT);
3037         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3038         if(xloadfont(&dc.ibfont, pattern))
3039                 die("st: can't open font %s\n", fontstr);
3040
3041         FcPatternDel(pattern, FC_SLANT);
3042         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3043         if(xloadfont(&dc.bfont, pattern))
3044                 die("st: can't open font %s\n", fontstr);
3045
3046         FcPatternDestroy(pattern);
3047 }
3048
3049 int
3050 xloadfontset(Font *f) {
3051         FcResult result;
3052
3053         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3054                 return 1;
3055         return 0;
3056 }
3057
3058 void
3059 xunloadfont(Font *f) {
3060         XftFontClose(xw.dpy, f->match);
3061         FcPatternDestroy(f->pattern);
3062         if(f->set)
3063                 FcFontSetDestroy(f->set);
3064 }
3065
3066 void
3067 xunloadfonts(void) {
3068         /* Free the loaded fonts in the font cache.  */
3069         while(frclen > 0)
3070                 XftFontClose(xw.dpy, frc[--frclen].font);
3071
3072         xunloadfont(&dc.font);
3073         xunloadfont(&dc.bfont);
3074         xunloadfont(&dc.ifont);
3075         xunloadfont(&dc.ibfont);
3076 }
3077
3078 void
3079 xzoom(const Arg *arg) {
3080         Arg larg;
3081
3082         larg.i = usedfontsize + arg->i;
3083         xzoomabs(&larg);
3084 }
3085
3086 void
3087 xzoomabs(const Arg *arg) {
3088         xunloadfonts();
3089         xloadfonts(usedfont, arg->i);
3090         cresize(0, 0);
3091         redraw(0);
3092         xhints();
3093 }
3094
3095 void
3096 xzoomreset(const Arg *arg) {
3097         Arg larg;
3098
3099         if(defaultfontsize > 0) {
3100                 larg.i = defaultfontsize;
3101                 xzoomabs(&larg);
3102         }
3103 }
3104
3105 void
3106 xinit(void) {
3107         XGCValues gcvalues;
3108         Cursor cursor;
3109         Window parent;
3110         pid_t thispid = getpid();
3111
3112         if(!(xw.dpy = XOpenDisplay(NULL)))
3113                 die("Can't open display\n");
3114         xw.scr = XDefaultScreen(xw.dpy);
3115         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3116
3117         /* font */
3118         if(!FcInit())
3119                 die("Could not init fontconfig.\n");
3120
3121         usedfont = (opt_font == NULL)? font : opt_font;
3122         xloadfonts(usedfont, 0);
3123
3124         /* colors */
3125         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3126         xloadcols();
3127
3128         /* adjust fixed window geometry */
3129         xw.w = 2 * borderpx + term.col * xw.cw;
3130         xw.h = 2 * borderpx + term.row * xw.ch;
3131         if(xw.gm & XNegative)
3132                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3133         if(xw.gm & YNegative)
3134                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3135
3136         /* Events */
3137         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3138         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3139         xw.attrs.bit_gravity = NorthWestGravity;
3140         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3141                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3142                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3143         xw.attrs.colormap = xw.cmap;
3144
3145         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3146                 parent = XRootWindow(xw.dpy, xw.scr);
3147         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3148                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3149                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3150                         | CWEventMask | CWColormap, &xw.attrs);
3151
3152         memset(&gcvalues, 0, sizeof(gcvalues));
3153         gcvalues.graphics_exposures = False;
3154         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3155                         &gcvalues);
3156         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3157                         DefaultDepth(xw.dpy, xw.scr));
3158         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3159         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3160
3161         /* Xft rendering context */
3162         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3163
3164         /* input methods */
3165         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3166                 XSetLocaleModifiers("@im=local");
3167                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3168                         XSetLocaleModifiers("@im=");
3169                         if((xw.xim = XOpenIM(xw.dpy,
3170                                         NULL, NULL, NULL)) == NULL) {
3171                                 die("XOpenIM failed. Could not open input"
3172                                         " device.\n");
3173                         }
3174                 }
3175         }
3176         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3177                                            | XIMStatusNothing, XNClientWindow, xw.win,
3178                                            XNFocusWindow, xw.win, NULL);
3179         if(xw.xic == NULL)
3180                 die("XCreateIC failed. Could not obtain input method.\n");
3181
3182         /* white cursor, black outline */
3183         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3184         XDefineCursor(xw.dpy, xw.win, cursor);
3185         XRecolorCursor(xw.dpy, cursor,
3186                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3187                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3188
3189         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3190         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3191         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3192         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3193
3194         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3195         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3196                         PropModeReplace, (uchar *)&thispid, 1);
3197
3198         xresettitle();
3199         XMapWindow(xw.dpy, xw.win);
3200         xhints();
3201         XSync(xw.dpy, False);
3202 }
3203
3204 void
3205 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3206         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3207             width = charlen * xw.cw, xp, i;
3208         int frcflags;
3209         int u8fl, u8fblen, u8cblen, doesexist;
3210         char *u8c, *u8fs;
3211         long unicodep;
3212         Font *font = &dc.font;
3213         FcResult fcres;
3214         FcPattern *fcpattern, *fontpattern;
3215         FcFontSet *fcsets[] = { NULL };
3216         FcCharSet *fccharset;
3217         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3218         XRenderColor colfg, colbg;
3219         XRectangle r;
3220         int oneatatime;
3221
3222         frcflags = FRC_NORMAL;
3223
3224         if(base.mode & ATTR_ITALIC) {
3225                 if(base.fg == defaultfg)
3226                         base.fg = defaultitalic;
3227                 font = &dc.ifont;
3228                 frcflags = FRC_ITALIC;
3229         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3230                 if(base.fg == defaultfg)
3231                         base.fg = defaultitalic;
3232                 font = &dc.ibfont;
3233                 frcflags = FRC_ITALICBOLD;
3234         } else if(base.mode & ATTR_UNDERLINE) {
3235                 if(base.fg == defaultfg)
3236                         base.fg = defaultunderline;
3237         }
3238
3239         if(IS_TRUECOL(base.fg)) {
3240                 colfg.alpha = 0xffff;
3241                 colfg.red = TRUERED(base.fg);
3242                 colfg.green = TRUEGREEN(base.fg);
3243                 colfg.blue = TRUEBLUE(base.fg);
3244                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3245                 fg = &truefg;
3246         } else {
3247                 fg = &dc.col[base.fg];
3248         }
3249
3250         if(IS_TRUECOL(base.bg)) {
3251                 colbg.alpha = 0xffff;
3252                 colbg.green = TRUEGREEN(base.bg);
3253                 colbg.red = TRUERED(base.bg);
3254                 colbg.blue = TRUEBLUE(base.bg);
3255                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3256                 bg = &truebg;
3257         } else {
3258                 bg = &dc.col[base.bg];
3259         }
3260
3261         if(base.mode & ATTR_BOLD) {
3262                 /*
3263                  * change basic system colors [0-7]
3264                  * to bright system colors [8-15]
3265                  */
3266                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3267                         fg = &dc.col[base.fg + 8];
3268
3269                 if(base.mode & ATTR_ITALIC) {
3270                         font = &dc.ibfont;
3271                         frcflags = FRC_ITALICBOLD;
3272                 } else {
3273                         font = &dc.bfont;
3274                         frcflags = FRC_BOLD;
3275                 }
3276         }
3277
3278         if(IS_SET(MODE_REVERSE)) {
3279                 if(fg == &dc.col[defaultfg]) {
3280                         fg = &dc.col[defaultbg];
3281                 } else {
3282                         colfg.red = ~fg->color.red;
3283                         colfg.green = ~fg->color.green;
3284                         colfg.blue = ~fg->color.blue;
3285                         colfg.alpha = fg->color.alpha;
3286                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3287                                         &revfg);
3288                         fg = &revfg;
3289                 }
3290
3291                 if(bg == &dc.col[defaultbg]) {
3292                         bg = &dc.col[defaultfg];
3293                 } else {
3294                         colbg.red = ~bg->color.red;
3295                         colbg.green = ~bg->color.green;
3296                         colbg.blue = ~bg->color.blue;
3297                         colbg.alpha = bg->color.alpha;
3298                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3299                                         &revbg);
3300                         bg = &revbg;
3301                 }
3302         }
3303
3304         if(base.mode & ATTR_REVERSE) {
3305                 temp = fg;
3306                 fg = bg;
3307                 bg = temp;
3308         }
3309
3310         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3311                 colfg.red = fg->color.red / 2;
3312                 colfg.green = fg->color.green / 2;
3313                 colfg.blue = fg->color.blue / 2;
3314                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3315                 fg = &revfg;
3316         }
3317
3318         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3319                 fg = bg;
3320
3321         if(base.mode & ATTR_INVISIBLE)
3322                 fg = bg;
3323
3324         /* Intelligent cleaning up of the borders. */
3325         if(x == 0) {
3326                 xclear(0, (y == 0)? 0 : winy, borderpx,
3327                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3328         }
3329         if(x + charlen >= term.col) {
3330                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3331                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3332         }
3333         if(y == 0)
3334                 xclear(winx, 0, winx + width, borderpx);
3335         if(y == term.row-1)
3336                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3337
3338         /* Clean up the region we want to draw to. */
3339         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3340
3341         /* Set the clip region because Xft is sometimes dirty. */
3342         r.x = 0;
3343         r.y = 0;
3344         r.height = xw.ch;
3345         r.width = width;
3346         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3347
3348         for(xp = winx; bytelen > 0;) {
3349                 /*
3350                  * Search for the range in the to be printed string of glyphs
3351                  * that are in the main font. Then print that range. If
3352                  * some glyph is found that is not in the font, do the
3353                  * fallback dance.
3354                  */
3355                 u8fs = s;
3356                 u8fblen = 0;
3357                 u8fl = 0;
3358                 oneatatime = font->width != xw.cw;
3359                 for(;;) {
3360                         u8c = s;
3361                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3362                         s += u8cblen;
3363                         bytelen -= u8cblen;
3364
3365                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3366                         if(doesexist) {
3367                                         u8fl++;
3368                                         u8fblen += u8cblen;
3369                                         if(!oneatatime && bytelen > 0)
3370                                                         continue;
3371                         }
3372
3373                         if(u8fl > 0) {
3374                                 XftDrawStringUtf8(xw.draw, fg,
3375                                                 font->match, xp,
3376                                                 winy + font->ascent,
3377                                                 (FcChar8 *)u8fs,
3378                                                 u8fblen);
3379                                 xp += xw.cw * u8fl;
3380                         }
3381                         break;
3382                 }
3383                 if(doesexist) {
3384                         if(oneatatime)
3385                                 continue;
3386                         break;
3387                 }
3388
3389                 /* Search the font cache. */
3390                 for(i = 0; i < frclen; i++) {
3391                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3392                                         && frc[i].flags == frcflags) {
3393                                 break;
3394                         }
3395                 }
3396
3397                 /* Nothing was found. */
3398                 if(i >= frclen) {
3399                         if(!font->set)
3400                                 xloadfontset(font);
3401                         fcsets[0] = font->set;
3402
3403                         /*
3404                          * Nothing was found in the cache. Now use
3405                          * some dozen of Fontconfig calls to get the
3406                          * font for one single character.
3407                          *
3408                          * Xft and fontconfig are design failures.
3409                          */
3410                         fcpattern = FcPatternDuplicate(font->pattern);
3411                         fccharset = FcCharSetCreate();
3412
3413                         FcCharSetAddChar(fccharset, unicodep);
3414                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3415                                         fccharset);
3416                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3417                                         FcTrue);
3418
3419                         FcConfigSubstitute(0, fcpattern,
3420                                         FcMatchPattern);
3421                         FcDefaultSubstitute(fcpattern);
3422
3423                         fontpattern = FcFontSetMatch(0, fcsets,
3424                                         FcTrue, fcpattern, &fcres);
3425
3426                         /*
3427                          * Overwrite or create the new cache entry.
3428                          */
3429                         if(frclen >= LEN(frc)) {
3430                                 frclen = LEN(frc) - 1;
3431                                 XftFontClose(xw.dpy, frc[frclen].font);
3432                         }
3433
3434                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3435                                         fontpattern);
3436                         frc[frclen].flags = frcflags;
3437
3438                         i = frclen;
3439                         frclen++;
3440
3441                         FcPatternDestroy(fcpattern);
3442                         FcCharSetDestroy(fccharset);
3443                 }
3444
3445                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3446                                 xp, winy + frc[i].font->ascent,
3447                                 (FcChar8 *)u8c, u8cblen);
3448
3449                 xp += xw.cw * wcwidth(unicodep);
3450         }
3451
3452         /*
3453          * This is how the loop above actually should be. Why does the
3454          * application have to care about font details?
3455          *
3456          * I have to repeat: Xft and Fontconfig are design failures.
3457          */
3458         /*
3459         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3460                         winy + font->ascent, (FcChar8 *)s, bytelen);
3461         */
3462
3463         if(base.mode & ATTR_UNDERLINE) {
3464                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3465                                 width, 1);
3466         }
3467
3468         if(base.mode & ATTR_STRUCK) {
3469                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3470                                 width, 1);
3471         }
3472
3473         /* Reset clip to none. */
3474         XftDrawSetClip(xw.draw, 0);
3475 }
3476
3477 void
3478 xdrawcursor(void) {
3479         static int oldx = 0, oldy = 0;
3480         int sl, width, curx;
3481         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3482
3483         LIMIT(oldx, 0, term.col-1);
3484         LIMIT(oldy, 0, term.row-1);
3485
3486         curx = term.c.x;
3487
3488         /* adjust position if in dummy */
3489         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3490                 oldx--;
3491         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3492                 curx--;
3493
3494         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3495
3496         /* remove the old cursor */
3497         sl = utf8len(term.line[oldy][oldx].c);
3498         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3499         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3500                         oldy, width, sl);
3501
3502         if(IS_SET(MODE_HIDE))
3503                 return;
3504
3505         /* draw the new one */
3506         if(xw.state & WIN_FOCUSED) {
3507                 if(IS_SET(MODE_REVERSE)) {
3508                         g.mode |= ATTR_REVERSE;
3509                         g.fg = defaultcs;
3510                         g.bg = defaultfg;
3511                 }
3512
3513                 sl = utf8len(g.c);
3514                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3515                         ? 2 : 1;
3516                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3517         } else {
3518                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3519                                 borderpx + curx * xw.cw,
3520                                 borderpx + term.c.y * xw.ch,
3521                                 xw.cw - 1, 1);
3522                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3523                                 borderpx + curx * xw.cw,
3524                                 borderpx + term.c.y * xw.ch,
3525                                 1, xw.ch - 1);
3526                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3527                                 borderpx + (curx + 1) * xw.cw - 1,
3528                                 borderpx + term.c.y * xw.ch,
3529                                 1, xw.ch - 1);
3530                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3531                                 borderpx + curx * xw.cw,
3532                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3533                                 xw.cw, 1);
3534         }
3535         oldx = curx, oldy = term.c.y;
3536 }
3537
3538
3539 void
3540 xsettitle(char *p) {
3541         XTextProperty prop;
3542
3543         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3544                         &prop);
3545         XSetWMName(xw.dpy, xw.win, &prop);
3546         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3547         XFree(prop.value);
3548 }
3549
3550 void
3551 xresettitle(void) {
3552         xsettitle(opt_title ? opt_title : "st");
3553 }
3554
3555 void
3556 redraw(int timeout) {
3557         struct timespec tv = {0, timeout * 1000};
3558
3559         tfulldirt();
3560         draw();
3561
3562         if(timeout > 0) {
3563                 nanosleep(&tv, NULL);
3564                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3565         }
3566 }
3567
3568 void
3569 draw(void) {
3570         drawregion(0, 0, term.col, term.row);
3571         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3572                         xw.h, 0, 0);
3573         XSetForeground(xw.dpy, dc.gc,
3574                         dc.col[IS_SET(MODE_REVERSE)?
3575                                 defaultfg : defaultbg].pixel);
3576 }
3577
3578 void
3579 drawregion(int x1, int y1, int x2, int y2) {
3580         int ic, ib, x, y, ox, sl;
3581         Glyph base, new;
3582         char buf[DRAW_BUF_SIZ];
3583         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3584         long unicodep;
3585
3586         if(!(xw.state & WIN_VISIBLE))
3587                 return;
3588
3589         for(y = y1; y < y2; y++) {
3590                 if(!term.dirty[y])
3591                         continue;
3592
3593                 xtermclear(0, y, term.col, y);
3594                 term.dirty[y] = 0;
3595                 base = term.line[y][0];
3596                 ic = ib = ox = 0;
3597                 for(x = x1; x < x2; x++) {
3598                         new = term.line[y][x];
3599                         if(new.mode == ATTR_WDUMMY)
3600                                 continue;
3601                         if(ena_sel && selected(x, y))
3602                                 new.mode ^= ATTR_REVERSE;
3603                         if(ib > 0 && (ATTRCMP(base, new)
3604                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3605                                 xdraws(buf, base, ox, y, ic, ib);
3606                                 ic = ib = 0;
3607                         }
3608                         if(ib == 0) {
3609                                 ox = x;
3610                                 base = new;
3611                         }
3612
3613                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3614                         memcpy(buf+ib, new.c, sl);
3615                         ib += sl;
3616                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3617                 }
3618                 if(ib > 0)
3619                         xdraws(buf, base, ox, y, ic, ib);
3620         }
3621         xdrawcursor();
3622 }
3623
3624 void
3625 expose(XEvent *ev) {
3626         XExposeEvent *e = &ev->xexpose;
3627
3628         if(xw.state & WIN_REDRAW) {
3629                 if(!e->count)
3630                         xw.state &= ~WIN_REDRAW;
3631         }
3632         redraw(0);
3633 }
3634
3635 void
3636 visibility(XEvent *ev) {
3637         XVisibilityEvent *e = &ev->xvisibility;
3638
3639         if(e->state == VisibilityFullyObscured) {
3640                 xw.state &= ~WIN_VISIBLE;
3641         } else if(!(xw.state & WIN_VISIBLE)) {
3642                 /* need a full redraw for next Expose, not just a buf copy */
3643                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3644         }
3645 }
3646
3647 void
3648 unmap(XEvent *ev) {
3649         xw.state &= ~WIN_VISIBLE;
3650 }
3651
3652 void
3653 xsetpointermotion(int set) {
3654         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3655         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3656 }
3657
3658 void
3659 xseturgency(int add) {
3660         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3661
3662         MODBIT(h->flags, add, XUrgencyHint);
3663         XSetWMHints(xw.dpy, xw.win, h);
3664         XFree(h);
3665 }
3666
3667 void
3668 focus(XEvent *ev) {
3669         XFocusChangeEvent *e = &ev->xfocus;
3670
3671         if(e->mode == NotifyGrab)
3672                 return;
3673
3674         if(ev->type == FocusIn) {
3675                 XSetICFocus(xw.xic);
3676                 xw.state |= WIN_FOCUSED;
3677                 xseturgency(0);
3678                 if(IS_SET(MODE_FOCUS))
3679                         ttywrite("\033[I", 3);
3680         } else {
3681                 XUnsetICFocus(xw.xic);
3682                 xw.state &= ~WIN_FOCUSED;
3683                 if(IS_SET(MODE_FOCUS))
3684                         ttywrite("\033[O", 3);
3685         }
3686 }
3687
3688 static inline bool
3689 match(uint mask, uint state) {
3690         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3691 }
3692
3693 void
3694 numlock(const Arg *dummy) {
3695         term.numlock ^= 1;
3696 }
3697
3698 char*
3699 kmap(KeySym k, uint state) {
3700         Key *kp;
3701         int i;
3702
3703         /* Check for mapped keys out of X11 function keys. */
3704         for(i = 0; i < LEN(mappedkeys); i++) {
3705                 if(mappedkeys[i] == k)
3706                         break;
3707         }
3708         if(i == LEN(mappedkeys)) {
3709                 if((k & 0xFFFF) < 0xFD00)
3710                         return NULL;
3711         }
3712
3713         for(kp = key; kp < key + LEN(key); kp++) {
3714                 if(kp->k != k)
3715                         continue;
3716
3717                 if(!match(kp->mask, state))
3718                         continue;
3719
3720                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3721                         continue;
3722                 if(term.numlock && kp->appkey == 2)
3723                         continue;
3724
3725                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3726                         continue;
3727
3728                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3729                         continue;
3730
3731                 return kp->s;
3732         }
3733
3734         return NULL;
3735 }
3736
3737 void
3738 kpress(XEvent *ev) {
3739         XKeyEvent *e = &ev->xkey;
3740         KeySym ksym;
3741         char buf[32], *customkey;
3742         int len;
3743         long c;
3744         Status status;
3745         Shortcut *bp;
3746
3747         if(IS_SET(MODE_KBDLOCK))
3748                 return;
3749
3750         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3751         /* 1. shortcuts */
3752         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3753                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3754                         bp->func(&(bp->arg));
3755                         return;
3756                 }
3757         }
3758
3759         /* 2. custom keys from config.h */
3760         if((customkey = kmap(ksym, e->state))) {
3761                 ttysend(customkey, strlen(customkey));
3762                 return;
3763         }
3764
3765         /* 3. composed string from input method */
3766         if(len == 0)
3767                 return;
3768         if(len == 1 && e->state & Mod1Mask) {
3769                 if(IS_SET(MODE_8BIT)) {
3770                         if(*buf < 0177) {
3771                                 c = *buf | 0x80;
3772                                 len = utf8encode(c, buf, UTF_SIZ);
3773                         }
3774                 } else {
3775                         buf[1] = buf[0];
3776                         buf[0] = '\033';
3777                         len = 2;
3778                 }
3779         }
3780         ttysend(buf, len);
3781 }
3782
3783
3784 void
3785 cmessage(XEvent *e) {
3786         /*
3787          * See xembed specs
3788          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3789          */
3790         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3791                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3792                         xw.state |= WIN_FOCUSED;
3793                         xseturgency(0);
3794                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3795                         xw.state &= ~WIN_FOCUSED;
3796                 }
3797         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3798                 /* Send SIGHUP to shell */
3799                 kill(pid, SIGHUP);
3800                 exit(EXIT_SUCCESS);
3801         }
3802 }
3803
3804 void
3805 cresize(int width, int height) {
3806         int col, row;
3807
3808         if(width != 0)
3809                 xw.w = width;
3810         if(height != 0)
3811                 xw.h = height;
3812
3813         col = (xw.w - 2 * borderpx) / xw.cw;
3814         row = (xw.h - 2 * borderpx) / xw.ch;
3815
3816         tresize(col, row);
3817         xresize(col, row);
3818         ttyresize();
3819 }
3820
3821 void
3822 resize(XEvent *e) {
3823         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3824                 return;
3825
3826         cresize(e->xconfigure.width, e->xconfigure.height);
3827 }
3828
3829 void
3830 run(void) {
3831         XEvent ev;
3832         int w = xw.w, h = xw.h;
3833         fd_set rfd;
3834         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3835         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3836         long deltatime;
3837
3838         /* Waiting for window mapping */
3839         while(1) {
3840                 XNextEvent(xw.dpy, &ev);
3841                 if(XFilterEvent(&ev, None))
3842                         continue;
3843                 if(ev.type == ConfigureNotify) {
3844                         w = ev.xconfigure.width;
3845                         h = ev.xconfigure.height;
3846                 } else if(ev.type == MapNotify) {
3847                         break;
3848                 }
3849         }
3850
3851         ttynew();
3852         cresize(w, h);
3853
3854         clock_gettime(CLOCK_MONOTONIC, &last);
3855         lastblink = last;
3856
3857         for(xev = actionfps;;) {
3858                 FD_ZERO(&rfd);
3859                 FD_SET(cmdfd, &rfd);
3860                 FD_SET(xfd, &rfd);
3861
3862                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3863                         if(errno == EINTR)
3864                                 continue;
3865                         die("select failed: %s\n", strerror(errno));
3866                 }
3867                 if(FD_ISSET(cmdfd, &rfd)) {
3868                         ttyread();
3869                         if(blinktimeout) {
3870                                 blinkset = tattrset(ATTR_BLINK);
3871                                 if(!blinkset)
3872                                         MODBIT(term.mode, 0, MODE_BLINK);
3873                         }
3874                 }
3875
3876                 if(FD_ISSET(xfd, &rfd))
3877                         xev = actionfps;
3878
3879                 clock_gettime(CLOCK_MONOTONIC, &now);
3880                 drawtimeout.tv_sec = 0;
3881                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3882                 tv = &drawtimeout;
3883
3884                 dodraw = 0;
3885                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3886                         tsetdirtattr(ATTR_BLINK);
3887                         term.mode ^= MODE_BLINK;
3888                         lastblink = now;
3889                         dodraw = 1;
3890                 }
3891                 deltatime = TIMEDIFF(now, last);
3892                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3893                                 || deltatime < 0) {
3894                         dodraw = 1;
3895                         last = now;
3896                 }
3897
3898                 if(dodraw) {
3899                         while(XPending(xw.dpy)) {
3900                                 XNextEvent(xw.dpy, &ev);
3901                                 if(XFilterEvent(&ev, None))
3902                                         continue;
3903                                 if(handler[ev.type])
3904                                         (handler[ev.type])(&ev);
3905                         }
3906
3907                         draw();
3908                         XFlush(xw.dpy);
3909
3910                         if(xev && !FD_ISSET(xfd, &rfd))
3911                                 xev--;
3912                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3913                                 if(blinkset) {
3914                                         if(TIMEDIFF(now, lastblink) \
3915                                                         > blinktimeout) {
3916                                                 drawtimeout.tv_nsec = 1000;
3917                                         } else {
3918                                                 drawtimeout.tv_nsec = (1E6 * \
3919                                                         (blinktimeout - \
3920                                                         TIMEDIFF(now,
3921                                                                 lastblink)));
3922                                         }
3923                                 } else {
3924                                         tv = NULL;
3925                                 }
3926                         }
3927                 }
3928         }
3929 }
3930
3931 void
3932 usage(void) {
3933         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3934         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3935         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3936 }
3937
3938 int
3939 main(int argc, char *argv[]) {
3940         char *titles;
3941         uint cols = 80, rows = 24;
3942
3943         xw.l = xw.t = 0;
3944         xw.isfixed = False;
3945
3946         ARGBEGIN {
3947         case 'a':
3948                 allowaltscreen = false;
3949                 break;
3950         case 'c':
3951                 opt_class = EARGF(usage());
3952                 break;
3953         case 'e':
3954                 /* eat all remaining arguments */
3955                 if(argc > 1) {
3956                         opt_cmd = &argv[1];
3957                         if(argv[1] != NULL && opt_title == NULL) {
3958                                 titles = xstrdup(argv[1]);
3959                                 opt_title = basename(titles);
3960                         }
3961                 }
3962                 goto run;
3963         case 'f':
3964                 opt_font = EARGF(usage());
3965                 break;
3966         case 'g':
3967                 xw.gm = XParseGeometry(EARGF(usage()),
3968                                 &xw.l, &xw.t, &cols, &rows);
3969                 break;
3970         case 'i':
3971                 xw.isfixed = True;
3972                 break;
3973         case 'o':
3974                 opt_io = EARGF(usage());
3975                 break;
3976         case 't':
3977                 opt_title = EARGF(usage());
3978                 break;
3979         case 'w':
3980                 opt_embed = EARGF(usage());
3981                 break;
3982         case 'v':
3983         default:
3984                 usage();
3985         } ARGEND;
3986
3987 run:
3988         setlocale(LC_CTYPE, "");
3989         XSetLocaleModifiers("");
3990         tnew(cols? cols : 1, rows? rows : 1);
3991         xinit();
3992         selinit();
3993         run();
3994
3995         return 0;
3996 }
3997