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