st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  80 #define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
  81 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  82
  83 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  84 #define IS_TRUECOL(x)    (1 << 24 & (x))
  85 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  86 #define TRUEGREEN(x)     (((x) & 0xff00))
  87 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  88
  89
  90 #define VT102ID "\033[?6c"
  91
  92 enum glyph_attribute {
  93         ATTR_NULL      = 0,
  94         ATTR_REVERSE   = 1,
  95         ATTR_UNDERLINE = 2,
  96         ATTR_BOLD      = 4,
  97         ATTR_ITALIC    = 8,
  98         ATTR_BLINK     = 16,
  99         ATTR_WRAP      = 32,
 100         ATTR_WIDE      = 64,
 101         ATTR_WDUMMY    = 128,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1,
 117         MODE_INSERT      = 2,
 118         MODE_APPKEYPAD   = 4,
 119         MODE_ALTSCREEN   = 8,
 120         MODE_CRLF        = 16,
 121         MODE_MOUSEBTN    = 32,
 122         MODE_MOUSEMOTION = 64,
 123         MODE_REVERSE     = 128,
 124         MODE_KBDLOCK     = 256,
 125         MODE_HIDE        = 512,
 126         MODE_ECHO        = 1024,
 127         MODE_APPCURSOR   = 2048,
 128         MODE_MOUSESGR    = 4096,
 129         MODE_8BIT        = 8192,
 130         MODE_BLINK       = 16384,
 131         MODE_FBLINK      = 32768,
 132         MODE_FOCUS       = 65536,
 133         MODE_MOUSEX10    = 131072,
 134         MODE_MOUSEMANY   = 262144,
 135         MODE_BRCKTPASTE  = 524288,
 136         MODE_PRINT       = 1048576,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Color;
 183 typedef Colormap Colormap;
 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 timeval tclick1;
 299         struct timeval tclick2;
 300 } Selection;
 301
 302 typedef union {
 303         int i;
 304         uint ui;
 305         float f;
 306         const void *v;
 307 } Arg;
 308
 309 typedef struct {
 310         uint mod;
 311         KeySym keysym;
 312         void (*func)(const Arg *);
 313         const Arg arg;
 314 } Shortcut;
 315
 316 /* function definitions used in config.h */
 317 static void clippaste(const Arg *);
 318 static void numlock(const Arg *);
 319 static void selpaste(const Arg *);
 320 static void xzoom(const Arg *);
 321 static void printsel(const Arg *);
 322 static void printscreen(const Arg *) ;
 323 static void toggleprinter(const Arg *);
 324
 325 /* Config.h for applying patches and the configuration. */
 326 #include "config.h"
 327
 328 /* Font structure */
 329 typedef struct {
 330         int height;
 331         int width;
 332         int ascent;
 333         int descent;
 334         short lbearing;
 335         short rbearing;
 336         XftFont *match;
 337         FcFontSet *set;
 338         FcPattern *pattern;
 339 } Font;
 340
 341 /* Drawing Context */
 342 typedef struct {
 343         Color col[MAX(LEN(colorname), 256)];
 344         Font font, bfont, ifont, ibfont;
 345         GC gc;
 346 } DC;
 347
 348 static void die(const char *, ...);
 349 static void draw(void);
 350 static void redraw(int);
 351 static void drawregion(int, int, int, int);
 352 static void execsh(void);
 353 static void sigchld(int);
 354 static void run(void);
 355
 356 static void csidump(void);
 357 static void csihandle(void);
 358 static void csiparse(void);
 359 static void csireset(void);
 360 static void strdump(void);
 361 static void strhandle(void);
 362 static void strparse(void);
 363 static void strreset(void);
 364
 365 static int tattrset(int);
 366 static void tprinter(char *, size_t);
 367 static void tdumpsel(void);
 368 static void tdumpline(int);
 369 static void tdump(void);
 370 static void tclearregion(int, int, int, int);
 371 static void tcursor(int);
 372 static void tdeletechar(int);
 373 static void tdeleteline(int);
 374 static void tinsertblank(int);
 375 static void tinsertblankline(int);
 376 static void tmoveto(int, int);
 377 static void tmoveato(int, int);
 378 static void tnew(int, int);
 379 static void tnewline(int);
 380 static void tputtab(int);
 381 static void tputc(char *, int);
 382 static void treset(void);
 383 static int tresize(int, int);
 384 static void tscrollup(int, int);
 385 static void tscrolldown(int, int);
 386 static void tsetattr(int *, int);
 387 static void tsetchar(char *, Glyph *, int, int);
 388 static void tsetscroll(int, int);
 389 static void tswapscreen(void);
 390 static void tsetdirt(int, int);
 391 static void tsetdirtattr(int);
 392 static void tsetmode(bool, bool, int *, int);
 393 static void tfulldirt(void);
 394 static void techo(char *, int);
 395 static void tcontrolcode(uchar );
 396 static void tdectest(char );
 397 static int32_t tdefcolor(int *, int *, int);
 398 static void tdeftran(char);
 399 static inline bool match(uint, uint);
 400 static void ttynew(void);
 401 static void ttyread(void);
 402 static void ttyresize(void);
 403 static void ttysend(char *, size_t);
 404 static void ttywrite(const char *, size_t);
 405
 406 static void xdraws(char *, Glyph, int, int, int, int);
 407 static void xhints(void);
 408 static void xclear(int, int, int, int);
 409 static void xdrawcursor(void);
 410 static void xinit(void);
 411 static void xloadcols(void);
 412 static int xsetcolorname(int, const char *);
 413 static int xgeommasktogravity(int);
 414 static int xloadfont(Font *, FcPattern *);
 415 static void xloadfonts(char *, double);
 416 static int xloadfontset(Font *);
 417 static void xsettitle(char *);
 418 static void xresettitle(void);
 419 static void xsetpointermotion(int);
 420 static void xseturgency(int);
 421 static void xsetsel(char *);
 422 static void xtermclear(int, int, int, int);
 423 static void xunloadfont(Font *);
 424 static void xunloadfonts(void);
 425 static void xresize(int, int);
 426
 427 static void expose(XEvent *);
 428 static void visibility(XEvent *);
 429 static void unmap(XEvent *);
 430 static char *kmap(KeySym, uint);
 431 static void kpress(XEvent *);
 432 static void cmessage(XEvent *);
 433 static void cresize(int, int);
 434 static void resize(XEvent *);
 435 static void focus(XEvent *);
 436 static void brelease(XEvent *);
 437 static void bpress(XEvent *);
 438 static void bmotion(XEvent *);
 439 static void selnotify(XEvent *);
 440 static void selclear(XEvent *);
 441 static void selrequest(XEvent *);
 442
 443 static void selinit(void);
 444 static void selnormalize(void);
 445 static inline bool selected(int, int);
 446 static char *getsel(void);
 447 static void selcopy(void);
 448 static void selscroll(int, int);
 449 static void selsnap(int, int *, int *, int);
 450 static void getbuttoninfo(XEvent *);
 451 static void mousereport(XEvent *);
 452
 453 static size_t utf8decode(char *, long *, size_t);
 454 static long utf8decodebyte(char, size_t *);
 455 static size_t utf8encode(long, char *, size_t);
 456 static char utf8encodebyte(long, size_t);
 457 static size_t utf8len(char *);
 458 static size_t utf8validate(long *, size_t);
 459
 460 static ssize_t xwrite(int, const char *, size_t);
 461 static void *xmalloc(size_t);
 462 static void *xrealloc(void *, size_t);
 463 static char *xstrdup(char *);
 464
 465 static void usage(void);
 466
 467 static void (*handler[LASTEvent])(XEvent *) = {
 468         [KeyPress] = kpress,
 469         [ClientMessage] = cmessage,
 470         [ConfigureNotify] = resize,
 471         [VisibilityNotify] = visibility,
 472         [UnmapNotify] = unmap,
 473         [Expose] = expose,
 474         [FocusIn] = focus,
 475         [FocusOut] = focus,
 476         [MotionNotify] = bmotion,
 477         [ButtonPress] = bpress,
 478         [ButtonRelease] = brelease,
 479         [SelectionClear] = selclear,
 480         [SelectionNotify] = selnotify,
 481         [SelectionRequest] = selrequest,
 482 };
 483
 484 /* Globals */
 485 static DC dc;
 486 static XWindow xw;
 487 static Term term;
 488 static CSIEscape csiescseq;
 489 static STREscape strescseq;
 490 static int cmdfd;
 491 static pid_t pid;
 492 static Selection sel;
 493 static int iofd = STDOUT_FILENO;
 494 static char **opt_cmd = NULL;
 495 static char *opt_io = NULL;
 496 static char *opt_title = NULL;
 497 static char *opt_embed = NULL;
 498 static char *opt_class = NULL;
 499 static char *opt_font = NULL;
 500 static int oldbutton = 3; /* button event on startup: 3 = release */
 501
 502 static char *usedfont = NULL;
 503 static double usedfontsize = 0;
 504
 505 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 506 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 507 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 508 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 509
 510 /* Font Ring Cache */
 511 enum {
 512         FRC_NORMAL,
 513         FRC_ITALIC,
 514         FRC_BOLD,
 515         FRC_ITALICBOLD
 516 };
 517
 518 typedef struct {
 519         XftFont *font;
 520         int flags;
 521 } Fontcache;
 522
 523 /* Fontcache is an array now. A new font will be appended to the array. */
 524 static Fontcache frc[16];
 525 static int frclen = 0;
 526
 527 ssize_t
 528 xwrite(int fd, const char *s, size_t len) {
 529         size_t aux = len;
 530
 531         while(len > 0) {
 532                 ssize_t r = write(fd, s, len);
 533                 if(r < 0)
 534                         return r;
 535                 len -= r;
 536                 s += r;
 537         }
 538         return aux;
 539 }
 540
 541 void *
 542 xmalloc(size_t len) {
 543         void *p = malloc(len);
 544
 545         if(!p)
 546                 die("Out of memory\n");
 547
 548         return p;
 549 }
 550
 551 void *
 552 xrealloc(void *p, size_t len) {
 553         if((p = realloc(p, len)) == NULL)
 554                 die("Out of memory\n");
 555
 556         return p;
 557 }
 558
 559 char *
 560 xstrdup(char *s) {
 561         if((s = strdup(s)) == NULL)
 562                 die("Out of memory\n");
 563
 564         return s;
 565 }
 566
 567 size_t
 568 utf8decode(char *c, long *u, size_t clen) {
 569         size_t i, j, len, type;
 570         long udecoded;
 571
 572         *u = UTF_INVALID;
 573         if(!clen)
 574                 return 0;
 575         udecoded = utf8decodebyte(c[0], &len);
 576         if(!BETWEEN(len, 1, UTF_SIZ))
 577                 return 1;
 578         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 579                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 580                 if(type != 0)
 581                         return j;
 582         }
 583         if(j < len)
 584                 return 0;
 585         *u = udecoded;
 586         utf8validate(u, len);
 587         return len;
 588 }
 589
 590 long
 591 utf8decodebyte(char c, size_t *i) {
 592         for(*i = 0; *i < LEN(utfmask); ++(*i))
 593                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 594                         return (uchar)c & ~utfmask[*i];
 595         return 0;
 596 }
 597
 598 size_t
 599 utf8encode(long u, char *c, size_t clen) {
 600         size_t len, i;
 601
 602         len = utf8validate(&u, 0);
 603         if(clen < len)
 604                 return 0;
 605         for(i = len - 1; i != 0; --i) {
 606                 c[i] = utf8encodebyte(u, 0);
 607                 u >>= 6;
 608         }
 609         c[0] = utf8encodebyte(u, len);
 610         return len;
 611 }
 612
 613 char
 614 utf8encodebyte(long u, size_t i) {
 615         return utfbyte[i] | (u & ~utfmask[i]);
 616 }
 617
 618 size_t
 619 utf8len(char *c) {
 620         return utf8decode(c, &(long){0}, UTF_SIZ);
 621 }
 622
 623 size_t
 624 utf8validate(long *u, size_t i) {
 625         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 626                 *u = UTF_INVALID;
 627         for(i = 1; *u > utfmax[i]; ++i)
 628                 ;
 629         return i;
 630 }
 631
 632 static void
 633 selinit(void) {
 634         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 635         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 636         sel.mode = 0;
 637         sel.ob.x = -1;
 638         sel.clip = NULL;
 639         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 640         if(sel.xtarget == None)
 641                 sel.xtarget = XA_STRING;
 642 }
 643
 644 static int
 645 x2col(int x) {
 646         x -= borderpx;
 647         x /= xw.cw;
 648
 649         return LIMIT(x, 0, term.col-1);
 650 }
 651
 652 static int
 653 y2row(int y) {
 654         y -= borderpx;
 655         y /= xw.ch;
 656
 657         return LIMIT(y, 0, term.row-1);
 658 }
 659
 660 static int tlinelen(int y) {
 661         int i = term.col;
 662
 663         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 664                 --i;
 665
 666         return i;
 667 }
 668
 669 static void
 670 selnormalize(void) {
 671         int i;
 672
 673         if(sel.ob.y == sel.oe.y) {
 674                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 675                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 676         } else {
 677                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 678                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 679         }
 680         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 681         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 682
 683         /* expand selection over line breaks */
 684         if (sel.type == SEL_RECTANGULAR)
 685                 return;
 686         i = tlinelen(sel.nb.y);
 687         if (i < sel.nb.x)
 688                 sel.nb.x = i;
 689         if (tlinelen(sel.ne.y) <= sel.ne.x)
 690                 sel.ne.x = term.col - 1;
 691 }
 692
 693 static inline bool
 694 selected(int x, int y) {
 695         if(sel.type == SEL_RECTANGULAR)
 696                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 697                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 698
 699         return BETWEEN(y, sel.nb.y, sel.ne.y)
 700             && (y != sel.nb.y || x >= sel.nb.x)
 701             && (y != sel.ne.y || x <= sel.ne.x);
 702 }
 703
 704 void
 705 selsnap(int mode, int *x, int *y, int direction) {
 706         switch(mode) {
 707         case SNAP_WORD:
 708                 /*
 709                  * Snap around if the word wraps around at the end or
 710                  * beginning of a line.
 711                  */
 712                 for(;;) {
 713                         if(direction < 0 && *x <= 0) {
 714                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 715                                                 & ATTR_WRAP) {
 716                                         *y -= 1;
 717                                         *x = term.col-1;
 718                                 } else {
 719                                         break;
 720                                 }
 721                         }
 722                         if(direction > 0 && *x >= term.col-1) {
 723                                 if(*y < term.row-1 && term.line[*y][*x].mode
 724                                                 & ATTR_WRAP) {
 725                                         *y += 1;
 726                                         *x = 0;
 727                                 } else {
 728                                         break;
 729                                 }
 730                         }
 731
 732                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 733                                 *x += direction;
 734                                 continue;
 735                         }
 736
 737                         if(*x >= tlinelen(*y) || strchr(worddelimiters,
 738                                         term.line[*y][*x+direction].c[0])) {
 739                                 break;
 740                         }
 741
 742                         *x += direction;
 743                 }
 744                 break;
 745         case SNAP_LINE:
 746                 /*
 747                  * Snap around if the the previous line or the current one
 748                  * has set ATTR_WRAP at its end. Then the whole next or
 749                  * previous line will be selected.
 750                  */
 751                 *x = (direction < 0) ? 0 : term.col - 1;
 752                 if(direction < 0 && *y > 0) {
 753                         for(; *y > 0; *y += direction) {
 754                                 if(!(term.line[*y-1][term.col-1].mode
 755                                                 & ATTR_WRAP)) {
 756                                         break;
 757                                 }
 758                         }
 759                 } else if(direction > 0 && *y < term.row-1) {
 760                         for(; *y < term.row; *y += direction) {
 761                                 if(!(term.line[*y][term.col-1].mode
 762                                                 & ATTR_WRAP)) {
 763                                         break;
 764                                 }
 765                         }
 766                 }
 767                 break;
 768         }
 769 }
 770
 771 void
 772 getbuttoninfo(XEvent *e) {
 773         int type;
 774         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 775
 776         sel.alt = IS_SET(MODE_ALTSCREEN);
 777
 778         sel.oe.x = x2col(e->xbutton.x);
 779         sel.oe.y = y2row(e->xbutton.y);
 780
 781         if(sel.ob.y < sel.oe.y
 782                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 783                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 784                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 785         } else {
 786                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 787                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 788         }
 789         selnormalize();
 790
 791         sel.type = SEL_REGULAR;
 792         for(type = 1; type < LEN(selmasks); ++type) {
 793                 if(match(selmasks[type], state)) {
 794                         sel.type = type;
 795                         break;
 796                 }
 797         }
 798 }
 799
 800 void
 801 mousereport(XEvent *e) {
 802         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 803             button = e->xbutton.button, state = e->xbutton.state,
 804             len;
 805         char buf[40];
 806         static int ox, oy;
 807
 808         /* from urxvt */
 809         if(e->xbutton.type == MotionNotify) {
 810                 if(x == ox && y == oy)
 811                         return;
 812                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 813                         return;
 814                 /* MOUSE_MOTION: no reporting if no button is pressed */
 815                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 816                         return;
 817
 818                 button = oldbutton + 32;
 819                 ox = x;
 820                 oy = y;
 821         } else {
 822                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 823                         button = 3;
 824                 } else {
 825                         button -= Button1;
 826                         if(button >= 3)
 827                                 button += 64 - 3;
 828                 }
 829                 if(e->xbutton.type == ButtonPress) {
 830                         oldbutton = button;
 831                         ox = x;
 832                         oy = y;
 833                 } else if(e->xbutton.type == ButtonRelease) {
 834                         oldbutton = 3;
 835                         /* MODE_MOUSEX10: no button release reporting */
 836                         if(IS_SET(MODE_MOUSEX10))
 837                                 return;
 838                         if (button == 64 || button == 65)
 839                                 return;
 840                 }
 841         }
 842
 843         if(!IS_SET(MODE_MOUSEX10)) {
 844                 button += (state & ShiftMask   ? 4  : 0)
 845                         + (state & Mod4Mask    ? 8  : 0)
 846                         + (state & ControlMask ? 16 : 0);
 847         }
 848
 849         len = 0;
 850         if(IS_SET(MODE_MOUSESGR)) {
 851                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 852                                 button, x+1, y+1,
 853                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 854         } else if(x < 223 && y < 223) {
 855                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 856                                 32+button, 32+x+1, 32+y+1);
 857         } else {
 858                 return;
 859         }
 860
 861         ttywrite(buf, len);
 862 }
 863
 864 void
 865 bpress(XEvent *e) {
 866         struct timeval now;
 867         Mousekey *mk;
 868
 869         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 870                 mousereport(e);
 871                 return;
 872         }
 873
 874         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 875                 if(e->xbutton.button == mk->b
 876                                 && match(mk->mask, e->xbutton.state)) {
 877                         ttysend(mk->s, strlen(mk->s));
 878                         return;
 879                 }
 880         }
 881
 882         if(e->xbutton.button == Button1) {
 883                 gettimeofday(&now, NULL);
 884
 885                 /* Clear previous selection, logically and visually. */
 886                 selclear(NULL);
 887                 sel.mode = 1;
 888                 sel.type = SEL_REGULAR;
 889                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 890                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 891
 892                 /*
 893                  * If the user clicks below predefined timeouts specific
 894                  * snapping behaviour is exposed.
 895                  */
 896                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 897                         sel.snap = SNAP_LINE;
 898                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 899                         sel.snap = SNAP_WORD;
 900                 } else {
 901                         sel.snap = 0;
 902                 }
 903                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 904                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 905                 selnormalize();
 906
 907                 /*
 908                  * Draw selection, unless it's regular and we don't want to
 909                  * make clicks visible
 910                  */
 911                 if(sel.snap != 0) {
 912                         sel.mode++;
 913                         tsetdirt(sel.nb.y, sel.ne.y);
 914                 }
 915                 sel.tclick2 = sel.tclick1;
 916                 sel.tclick1 = now;
 917         }
 918 }
 919
 920 char *
 921 getsel(void) {
 922         char *str, *ptr;
 923         int x, y, bufsize, size, ex;
 924         Glyph *gp, *last;
 925
 926         if(sel.ob.x == -1)
 927                 return NULL;
 928
 929         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 930         ptr = str = xmalloc(bufsize);
 931
 932         /* append every set & selected glyph to the selection */
 933         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 934                 gp = &term.line[y][0];
 935                 last = &gp[term.col-1];
 936
 937                 while(last >= gp && !(selected(last - gp, y) &&
 938                                       strcmp(last->c, " ") != 0)) {
 939                         --last;
 940                 }
 941
 942                 for(x = 0; gp <= last; x++, ++gp) {
 943                         if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 944                                 continue;
 945
 946                         size = utf8len(gp->c);
 947                         memcpy(ptr, gp->c, size);
 948                         ptr += size;
 949                 }
 950
 951                 /*
 952                  * Copy and pasting of line endings is inconsistent
 953                  * in the inconsistent terminal and GUI world.
 954                  * The best solution seems like to produce '\n' when
 955                  * something is copied from st and convert '\n' to
 956                  * '\r', when something to be pasted is received by
 957                  * st.
 958                  * FIXME: Fix the computer world.
 959                  */
 960                 if(y < sel.ne.y && !(x > 0 && (gp-1)->mode & ATTR_WRAP))
 961                         *ptr++ = '\n';
 962
 963                 /*
 964                  * If the last selected line expands in the selection
 965                  * after the visible text '\n' is appended.
 966                  */
 967                 if(y == sel.ne.y) {
 968                         ex = sel.ne.x;
 969                         if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 970                                 ex = sel.nb.x;
 971                         if(tlinelen(y) < ex)
 972                                 *ptr++ = '\n';
 973                 }
 974         }
 975         *ptr = 0;
 976         return str;
 977 }
 978
 979 void
 980 selcopy(void) {
 981         xsetsel(getsel());
 982 }
 983
 984 void
 985 selnotify(XEvent *e) {
 986         ulong nitems, ofs, rem;
 987         int format;
 988         uchar *data, *last, *repl;
 989         Atom type;
 990
 991         ofs = 0;
 992         do {
 993                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 994                                         False, AnyPropertyType, &type, &format,
 995                                         &nitems, &rem, &data)) {
 996                         fprintf(stderr, "Clipboard allocation failed\n");
 997                         return;
 998                 }
 999
1000                 /*
1001                  * As seen in getsel:
1002                  * Line endings are inconsistent in the terminal and GUI world
1003                  * copy and pasting. When receiving some selection data,
1004                  * replace all '\n' with '\r'.
1005                  * FIXME: Fix the computer world.
1006                  */
1007                 repl = data;
1008                 last = data + nitems * format / 8;
1009                 while((repl = memchr(repl, '\n', last - repl))) {
1010                         *repl++ = '\r';
1011                 }
1012
1013                 if(IS_SET(MODE_BRCKTPASTE))
1014                         ttywrite("\033[200~", 6);
1015                 ttysend((char *)data, nitems * format / 8);
1016                 if(IS_SET(MODE_BRCKTPASTE))
1017                         ttywrite("\033[201~", 6);
1018                 XFree(data);
1019                 /* number of 32-bit chunks returned */
1020                 ofs += nitems * format / 32;
1021         } while(rem > 0);
1022 }
1023
1024 void
1025 selpaste(const Arg *dummy) {
1026         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1027                         xw.win, CurrentTime);
1028 }
1029
1030 void
1031 clippaste(const Arg *dummy) {
1032         Atom clipboard;
1033
1034         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1035         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1036                         xw.win, CurrentTime);
1037 }
1038
1039 void
1040 selclear(XEvent *e) {
1041         if(sel.ob.x == -1)
1042                 return;
1043         sel.ob.x = -1;
1044         tsetdirt(sel.nb.y, sel.ne.y);
1045 }
1046
1047 void
1048 selrequest(XEvent *e) {
1049         XSelectionRequestEvent *xsre;
1050         XSelectionEvent xev;
1051         Atom xa_targets, string;
1052
1053         xsre = (XSelectionRequestEvent *) e;
1054         xev.type = SelectionNotify;
1055         xev.requestor = xsre->requestor;
1056         xev.selection = xsre->selection;
1057         xev.target = xsre->target;
1058         xev.time = xsre->time;
1059         /* reject */
1060         xev.property = None;
1061
1062         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1063         if(xsre->target == xa_targets) {
1064                 /* respond with the supported type */
1065                 string = sel.xtarget;
1066                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1067                                 XA_ATOM, 32, PropModeReplace,
1068                                 (uchar *) &string, 1);
1069                 xev.property = xsre->property;
1070         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1071                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1072                                 xsre->target, 8, PropModeReplace,
1073                                 (uchar *) sel.clip, strlen(sel.clip));
1074                 xev.property = xsre->property;
1075         }
1076
1077         /* all done, send a notification to the listener */
1078         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1079                 fprintf(stderr, "Error sending SelectionNotify event\n");
1080 }
1081
1082 void
1083 xsetsel(char *str) {
1084         /* register the selection for both the clipboard and the primary */
1085         Atom clipboard;
1086
1087         free(sel.clip);
1088         sel.clip = str;
1089
1090         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1091
1092         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1093         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1094 }
1095
1096 void
1097 brelease(XEvent *e) {
1098         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1099                 mousereport(e);
1100                 return;
1101         }
1102
1103         if(e->xbutton.button == Button2) {
1104                 selpaste(NULL);
1105         } else if(e->xbutton.button == Button1) {
1106                 if(sel.mode < 2) {
1107                         selclear(NULL);
1108                 } else {
1109                         getbuttoninfo(e);
1110                         selcopy();
1111                 }
1112                 sel.mode = 0;
1113                 tsetdirt(sel.nb.y, sel.ne.y);
1114         }
1115 }
1116
1117 void
1118 bmotion(XEvent *e) {
1119         int oldey, oldex, oldsby, oldsey;
1120
1121         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1122                 mousereport(e);
1123                 return;
1124         }
1125
1126         if(!sel.mode)
1127                 return;
1128
1129         sel.mode++;
1130         oldey = sel.oe.y;
1131         oldex = sel.oe.x;
1132         oldsby = sel.nb.y;
1133         oldsey = sel.ne.y;
1134         getbuttoninfo(e);
1135
1136         if(oldey != sel.oe.y || oldex != sel.oe.x)
1137                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1138 }
1139
1140 void
1141 die(const char *errstr, ...) {
1142         va_list ap;
1143
1144         va_start(ap, errstr);
1145         vfprintf(stderr, errstr, ap);
1146         va_end(ap);
1147         exit(EXIT_FAILURE);
1148 }
1149
1150 void
1151 execsh(void) {
1152         char **args;
1153         char *envshell = getenv("SHELL");
1154         const struct passwd *pass = getpwuid(getuid());
1155         char buf[sizeof(long) * 8 + 1];
1156
1157         unsetenv("COLUMNS");
1158         unsetenv("LINES");
1159         unsetenv("TERMCAP");
1160
1161         if(pass) {
1162                 setenv("LOGNAME", pass->pw_name, 1);
1163                 setenv("USER", pass->pw_name, 1);
1164                 setenv("SHELL", pass->pw_shell, 0);
1165                 setenv("HOME", pass->pw_dir, 0);
1166         }
1167
1168         snprintf(buf, sizeof(buf), "%lu", xw.win);
1169         setenv("WINDOWID", buf, 1);
1170
1171         signal(SIGCHLD, SIG_DFL);
1172         signal(SIGHUP, SIG_DFL);
1173         signal(SIGINT, SIG_DFL);
1174         signal(SIGQUIT, SIG_DFL);
1175         signal(SIGTERM, SIG_DFL);
1176         signal(SIGALRM, SIG_DFL);
1177
1178         DEFAULT(envshell, shell);
1179         setenv("TERM", termname, 1);
1180         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1181         execvp(args[0], args);
1182         exit(EXIT_FAILURE);
1183 }
1184
1185 void
1186 sigchld(int a) {
1187         int stat = 0;
1188
1189         if(waitpid(pid, &stat, 0) < 0)
1190                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1191
1192         if(WIFEXITED(stat)) {
1193                 exit(WEXITSTATUS(stat));
1194         } else {
1195                 exit(EXIT_FAILURE);
1196         }
1197 }
1198
1199 void
1200 ttynew(void) {
1201         int m, s;
1202         struct winsize w = {term.row, term.col, 0, 0};
1203
1204         /* seems to work fine on linux, openbsd and freebsd */
1205         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1206                 die("openpty failed: %s\n", strerror(errno));
1207
1208         switch(pid = fork()) {
1209         case -1:
1210                 die("fork failed\n");
1211                 break;
1212         case 0:
1213                 setsid(); /* create a new process group */
1214                 dup2(s, STDIN_FILENO);
1215                 dup2(s, STDOUT_FILENO);
1216                 dup2(s, STDERR_FILENO);
1217                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1218                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1219                 close(s);
1220                 close(m);
1221                 execsh();
1222                 break;
1223         default:
1224                 close(s);
1225                 cmdfd = m;
1226                 signal(SIGCHLD, sigchld);
1227                 if(opt_io) {
1228                         term.mode |= MODE_PRINT;
1229                         iofd = (!strcmp(opt_io, "-")) ?
1230                                   STDOUT_FILENO :
1231                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1232                         if(iofd < 0) {
1233                                 fprintf(stderr, "Error opening %s:%s\n",
1234                                         opt_io, strerror(errno));
1235                         }
1236                 }
1237                 break;
1238         }
1239 }
1240
1241 void
1242 ttyread(void) {
1243         static char buf[BUFSIZ];
1244         static int buflen = 0;
1245         char *ptr;
1246         char s[UTF_SIZ];
1247         int charsize; /* size of utf8 char in bytes */
1248         long unicodep;
1249         int ret;
1250
1251         /* append read bytes to unprocessed bytes */
1252         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1253                 die("Couldn't read from shell: %s\n", strerror(errno));
1254
1255         /* process every complete utf8 char */
1256         buflen += ret;
1257         ptr = buf;
1258         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1259                 utf8encode(unicodep, s, UTF_SIZ);
1260                 tputc(s, charsize);
1261                 ptr += charsize;
1262                 buflen -= charsize;
1263         }
1264
1265         /* keep any uncomplete utf8 char for the next call */
1266         memmove(buf, ptr, buflen);
1267 }
1268
1269 void
1270 ttywrite(const char *s, size_t n) {
1271         if(xwrite(cmdfd, s, n) == -1)
1272                 die("write error on tty: %s\n", strerror(errno));
1273 }
1274
1275 void
1276 ttysend(char *s, size_t n) {
1277         ttywrite(s, n);
1278         if(IS_SET(MODE_ECHO))
1279                 techo(s, n);
1280 }
1281
1282 void
1283 ttyresize(void) {
1284         struct winsize w;
1285
1286         w.ws_row = term.row;
1287         w.ws_col = term.col;
1288         w.ws_xpixel = xw.tw;
1289         w.ws_ypixel = xw.th;
1290         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1291                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1292 }
1293
1294 int
1295 tattrset(int attr) {
1296         int i, j;
1297
1298         for(i = 0; i < term.row-1; i++) {
1299                 for(j = 0; j < term.col-1; j++) {
1300                         if(term.line[i][j].mode & attr)
1301                                 return 1;
1302                 }
1303         }
1304
1305         return 0;
1306 }
1307
1308 void
1309 tsetdirt(int top, int bot) {
1310         int i;
1311
1312         LIMIT(top, 0, term.row-1);
1313         LIMIT(bot, 0, term.row-1);
1314
1315         for(i = top; i <= bot; i++)
1316                 term.dirty[i] = 1;
1317 }
1318
1319 void
1320 tsetdirtattr(int attr) {
1321         int i, j;
1322
1323         for(i = 0; i < term.row-1; i++) {
1324                 for(j = 0; j < term.col-1; j++) {
1325                         if(term.line[i][j].mode & attr) {
1326                                 tsetdirt(i, i);
1327                                 break;
1328                         }
1329                 }
1330         }
1331 }
1332
1333 void
1334 tfulldirt(void) {
1335         tsetdirt(0, term.row-1);
1336 }
1337
1338 void
1339 tcursor(int mode) {
1340         static TCursor c[2];
1341         bool alt = IS_SET(MODE_ALTSCREEN);
1342
1343         if(mode == CURSOR_SAVE) {
1344                 c[alt] = term.c;
1345         } else if(mode == CURSOR_LOAD) {
1346                 term.c = c[alt];
1347                 tmoveto(c[alt].x, c[alt].y);
1348         }
1349 }
1350
1351 void
1352 treset(void) {
1353         uint i;
1354
1355         term.c = (TCursor){{
1356                 .mode = ATTR_NULL,
1357                 .fg = defaultfg,
1358                 .bg = defaultbg
1359         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1360
1361         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1362         for(i = tabspaces; i < term.col; i += tabspaces)
1363                 term.tabs[i] = 1;
1364         term.top = 0;
1365         term.bot = term.row - 1;
1366         term.mode = MODE_WRAP;
1367         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1368         term.charset = 0;
1369
1370         tclearregion(0, 0, term.col-1, term.row-1);
1371         tmoveto(0, 0);
1372         tcursor(CURSOR_SAVE);
1373 }
1374
1375 void
1376 tnew(int col, int row) {
1377         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1378         tresize(col, row);
1379         term.numlock = 1;
1380
1381         treset();
1382 }
1383
1384 void
1385 tswapscreen(void) {
1386         Line *tmp = term.line;
1387
1388         term.line = term.alt;
1389         term.alt = tmp;
1390         term.mode ^= MODE_ALTSCREEN;
1391         tfulldirt();
1392 }
1393
1394 void
1395 tscrolldown(int orig, int n) {
1396         int i;
1397         Line temp;
1398
1399         LIMIT(n, 0, term.bot-orig+1);
1400
1401         tsetdirt(orig, term.bot-n);
1402         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1403
1404         for(i = term.bot; i >= orig+n; i--) {
1405                 temp = term.line[i];
1406                 term.line[i] = term.line[i-n];
1407                 term.line[i-n] = temp;
1408         }
1409
1410         selscroll(orig, n);
1411 }
1412
1413 void
1414 tscrollup(int orig, int n) {
1415         int i;
1416         Line temp;
1417
1418         LIMIT(n, 0, term.bot-orig+1);
1419
1420         tclearregion(0, orig, term.col-1, orig+n-1);
1421         tsetdirt(orig+n, term.bot);
1422
1423         for(i = orig; i <= term.bot-n; i++) {
1424                 temp = term.line[i];
1425                 term.line[i] = term.line[i+n];
1426                 term.line[i+n] = temp;
1427         }
1428
1429         selscroll(orig, -n);
1430 }
1431
1432 void
1433 selscroll(int orig, int n) {
1434         if(sel.ob.x == -1)
1435                 return;
1436
1437         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1438                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1439                         selclear(NULL);
1440                         return;
1441                 }
1442                 if(sel.type == SEL_RECTANGULAR) {
1443                         if(sel.ob.y < term.top)
1444                                 sel.ob.y = term.top;
1445                         if(sel.oe.y > term.bot)
1446                                 sel.oe.y = term.bot;
1447                 } else {
1448                         if(sel.ob.y < term.top) {
1449                                 sel.ob.y = term.top;
1450                                 sel.ob.x = 0;
1451                         }
1452                         if(sel.oe.y > term.bot) {
1453                                 sel.oe.y = term.bot;
1454                                 sel.oe.x = term.col;
1455                         }
1456                 }
1457                 selnormalize();
1458         }
1459 }
1460
1461 void
1462 tnewline(int first_col) {
1463         int y = term.c.y;
1464
1465         if(y == term.bot) {
1466                 tscrollup(term.top, 1);
1467         } else {
1468                 y++;
1469         }
1470         tmoveto(first_col ? 0 : term.c.x, y);
1471 }
1472
1473 void
1474 csiparse(void) {
1475         char *p = csiescseq.buf, *np;
1476         long int v;
1477
1478         csiescseq.narg = 0;
1479         if(*p == '?') {
1480                 csiescseq.priv = 1;
1481                 p++;
1482         }
1483
1484         csiescseq.buf[csiescseq.len] = '\0';
1485         while(p < csiescseq.buf+csiescseq.len) {
1486                 np = NULL;
1487                 v = strtol(p, &np, 10);
1488                 if(np == p)
1489                         v = 0;
1490                 if(v == LONG_MAX || v == LONG_MIN)
1491                         v = -1;
1492                 csiescseq.arg[csiescseq.narg++] = v;
1493                 p = np;
1494                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1495                         break;
1496                 p++;
1497         }
1498         csiescseq.mode = *p;
1499 }
1500
1501 /* for absolute user moves, when decom is set */
1502 void
1503 tmoveato(int x, int y) {
1504         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1505 }
1506
1507 void
1508 tmoveto(int x, int y) {
1509         int miny, maxy;
1510
1511         if(term.c.state & CURSOR_ORIGIN) {
1512                 miny = term.top;
1513                 maxy = term.bot;
1514         } else {
1515                 miny = 0;
1516                 maxy = term.row - 1;
1517         }
1518         LIMIT(x, 0, term.col-1);
1519         LIMIT(y, miny, maxy);
1520         term.c.state &= ~CURSOR_WRAPNEXT;
1521         term.c.x = x;
1522         term.c.y = y;
1523 }
1524
1525 void
1526 tsetchar(char *c, Glyph *attr, int x, int y) {
1527         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1528                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1529                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1530                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1531                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1532                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1533                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1534                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1535                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1536         };
1537
1538         /*
1539          * The table is proudly stolen from rxvt.
1540          */
1541         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1542                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1543                         c = vt100_0[c[0] - 0x41];
1544                 }
1545         }
1546
1547         if(term.line[y][x].mode & ATTR_WIDE) {
1548                 if(x+1 < term.col) {
1549                         term.line[y][x+1].c[0] = ' ';
1550                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1551                 }
1552         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1553                 term.line[y][x-1].c[0] = ' ';
1554                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1555         }
1556
1557         term.dirty[y] = 1;
1558         term.line[y][x] = *attr;
1559         memcpy(term.line[y][x].c, c, UTF_SIZ);
1560 }
1561
1562 void
1563 tclearregion(int x1, int y1, int x2, int y2) {
1564         int x, y, temp;
1565
1566         if(x1 > x2)
1567                 temp = x1, x1 = x2, x2 = temp;
1568         if(y1 > y2)
1569                 temp = y1, y1 = y2, y2 = temp;
1570
1571         LIMIT(x1, 0, term.col-1);
1572         LIMIT(x2, 0, term.col-1);
1573         LIMIT(y1, 0, term.row-1);
1574         LIMIT(y2, 0, term.row-1);
1575
1576         for(y = y1; y <= y2; y++) {
1577                 term.dirty[y] = 1;
1578                 for(x = x1; x <= x2; x++) {
1579                         if(selected(x, y))
1580                                 selclear(NULL);
1581                         term.line[y][x] = term.c.attr;
1582                         memcpy(term.line[y][x].c, " ", 2);
1583                 }
1584         }
1585 }
1586
1587 void
1588 tdeletechar(int n) {
1589         int dst, src, size;
1590         Glyph *line;
1591
1592         LIMIT(n, 0, term.col - term.c.x);
1593
1594         dst = term.c.x;
1595         src = term.c.x + n;
1596         size = term.col - src;
1597         line = term.line[term.c.y];
1598
1599         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1600         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1601 }
1602
1603 void
1604 tinsertblank(int n) {
1605         int dst, src, size;
1606         Glyph *line;
1607
1608         LIMIT(n, 0, term.col - term.c.x);
1609
1610         dst = term.c.x + n;
1611         src = term.c.x;
1612         size = term.col - dst;
1613         line = term.line[term.c.y];
1614
1615         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1616         tclearregion(src, term.c.y, dst - 1, term.c.y);
1617 }
1618
1619 void
1620 tinsertblankline(int n) {
1621         if(BETWEEN(term.c.y, term.top, term.bot))
1622                 tscrolldown(term.c.y, n);
1623 }
1624
1625 void
1626 tdeleteline(int n) {
1627         if(BETWEEN(term.c.y, term.top, term.bot))
1628                 tscrollup(term.c.y, n);
1629 }
1630
1631 int32_t
1632 tdefcolor(int *attr, int *npar, int l) {
1633         int32_t idx = -1;
1634         uint r, g, b;
1635
1636         switch (attr[*npar + 1]) {
1637         case 2: /* direct color in RGB space */
1638                 if (*npar + 4 >= l) {
1639                         fprintf(stderr,
1640                                 "erresc(38): Incorrect number of parameters (%d)\n",
1641                                 *npar);
1642                         break;
1643                 }
1644                 r = attr[*npar + 2];
1645                 g = attr[*npar + 3];
1646                 b = attr[*npar + 4];
1647                 *npar += 4;
1648                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1649                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1650                                 r, g, b);
1651                 else
1652                         idx = TRUECOLOR(r, g, b);
1653                 break;
1654         case 5: /* indexed color */
1655                 if (*npar + 2 >= l) {
1656                         fprintf(stderr,
1657                                 "erresc(38): Incorrect number of parameters (%d)\n",
1658                                 *npar);
1659                         break;
1660                 }
1661                 *npar += 2;
1662                 if(!BETWEEN(attr[*npar], 0, 255))
1663                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1664                 else
1665                         idx = attr[*npar];
1666                 break;
1667         case 0: /* implemented defined (only foreground) */
1668         case 1: /* transparent */
1669         case 3: /* direct color in CMY space */
1670         case 4: /* direct color in CMYK space */
1671         default:
1672                 fprintf(stderr,
1673                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1674                 break;
1675         }
1676
1677         return idx;
1678 }
1679
1680 void
1681 tsetattr(int *attr, int l) {
1682         int i;
1683         int32_t idx;
1684
1685         for(i = 0; i < l; i++) {
1686                 switch(attr[i]) {
1687                 case 0:
1688                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1689                                         | ATTR_BOLD | ATTR_ITALIC \
1690                                         | ATTR_BLINK);
1691                         term.c.attr.fg = defaultfg;
1692                         term.c.attr.bg = defaultbg;
1693                         break;
1694                 case 1:
1695                         term.c.attr.mode |= ATTR_BOLD;
1696                         break;
1697                 case 3:
1698                         term.c.attr.mode |= ATTR_ITALIC;
1699                         break;
1700                 case 4:
1701                         term.c.attr.mode |= ATTR_UNDERLINE;
1702                         break;
1703                 case 5: /* slow blink */
1704                 case 6: /* rapid blink */
1705                         term.c.attr.mode |= ATTR_BLINK;
1706                         break;
1707                 case 7:
1708                         term.c.attr.mode |= ATTR_REVERSE;
1709                         break;
1710                 case 21:
1711                 case 22:
1712                         term.c.attr.mode &= ~ATTR_BOLD;
1713                         break;
1714                 case 23:
1715                         term.c.attr.mode &= ~ATTR_ITALIC;
1716                         break;
1717                 case 24:
1718                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1719                         break;
1720                 case 25:
1721                 case 26:
1722                         term.c.attr.mode &= ~ATTR_BLINK;
1723                         break;
1724                 case 27:
1725                         term.c.attr.mode &= ~ATTR_REVERSE;
1726                         break;
1727                 case 38:
1728                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1729                                 term.c.attr.fg = idx;
1730                         break;
1731                 case 39:
1732                         term.c.attr.fg = defaultfg;
1733                         break;
1734                 case 48:
1735                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1736                                 term.c.attr.bg = idx;
1737                         break;
1738                 case 49:
1739                         term.c.attr.bg = defaultbg;
1740                         break;
1741                 default:
1742                         if(BETWEEN(attr[i], 30, 37)) {
1743                                 term.c.attr.fg = attr[i] - 30;
1744                         } else if(BETWEEN(attr[i], 40, 47)) {
1745                                 term.c.attr.bg = attr[i] - 40;
1746                         } else if(BETWEEN(attr[i], 90, 97)) {
1747                                 term.c.attr.fg = attr[i] - 90 + 8;
1748                         } else if(BETWEEN(attr[i], 100, 107)) {
1749                                 term.c.attr.bg = attr[i] - 100 + 8;
1750                         } else {
1751                                 fprintf(stderr,
1752                                         "erresc(default): gfx attr %d unknown\n",
1753                                         attr[i]), csidump();
1754                         }
1755                         break;
1756                 }
1757         }
1758 }
1759
1760 void
1761 tsetscroll(int t, int b) {
1762         int temp;
1763
1764         LIMIT(t, 0, term.row-1);
1765         LIMIT(b, 0, term.row-1);
1766         if(t > b) {
1767                 temp = t;
1768                 t = b;
1769                 b = temp;
1770         }
1771         term.top = t;
1772         term.bot = b;
1773 }
1774
1775 void
1776 tsetmode(bool priv, bool set, int *args, int narg) {
1777         int *lim, mode;
1778         bool alt;
1779
1780         for(lim = args + narg; args < lim; ++args) {
1781                 if(priv) {
1782                         switch(*args) {
1783                         case 1: /* DECCKM -- Cursor key */
1784                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1785                                 break;
1786                         case 5: /* DECSCNM -- Reverse video */
1787                                 mode = term.mode;
1788                                 MODBIT(term.mode, set, MODE_REVERSE);
1789                                 if(mode != term.mode)
1790                                         redraw(REDRAW_TIMEOUT);
1791                                 break;
1792                         case 6: /* DECOM -- Origin */
1793                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1794                                 tmoveato(0, 0);
1795                                 break;
1796                         case 7: /* DECAWM -- Auto wrap */
1797                                 MODBIT(term.mode, set, MODE_WRAP);
1798                                 break;
1799                         case 0:  /* Error (IGNORED) */
1800                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1801                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1802                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1803                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1804                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1805                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1806                         case 42: /* DECNRCM -- National characters (IGNORED) */
1807                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1808                                 break;
1809                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1810                                 MODBIT(term.mode, !set, MODE_HIDE);
1811                                 break;
1812                         case 9:    /* X10 mouse compatibility mode */
1813                                 xsetpointermotion(0);
1814                                 MODBIT(term.mode, 0, MODE_MOUSE);
1815                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1816                                 break;
1817                         case 1000: /* 1000: report button press */
1818                                 xsetpointermotion(0);
1819                                 MODBIT(term.mode, 0, MODE_MOUSE);
1820                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1821                                 break;
1822                         case 1002: /* 1002: report motion on button press */
1823                                 xsetpointermotion(0);
1824                                 MODBIT(term.mode, 0, MODE_MOUSE);
1825                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1826                                 break;
1827                         case 1003: /* 1003: enable all mouse motions */
1828                                 xsetpointermotion(set);
1829                                 MODBIT(term.mode, 0, MODE_MOUSE);
1830                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1831                                 break;
1832                         case 1004: /* 1004: send focus events to tty */
1833                                 MODBIT(term.mode, set, MODE_FOCUS);
1834                                 break;
1835                         case 1006: /* 1006: extended reporting mode */
1836                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1837                                 break;
1838                         case 1034:
1839                                 MODBIT(term.mode, set, MODE_8BIT);
1840                                 break;
1841                         case 1049: /* swap screen & set/restore cursor as xterm */
1842                                 if (!allowaltscreen)
1843                                         break;
1844                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1845                                 /* FALLTHROUGH */
1846                         case 47: /* swap screen */
1847                         case 1047:
1848                                 if (!allowaltscreen)
1849                                         break;
1850                                 alt = IS_SET(MODE_ALTSCREEN);
1851                                 if(alt) {
1852                                         tclearregion(0, 0, term.col-1,
1853                                                         term.row-1);
1854                                 }
1855                                 if(set ^ alt) /* set is always 1 or 0 */
1856                                         tswapscreen();
1857                                 if(*args != 1049)
1858                                         break;
1859                                 /* FALLTHROUGH */
1860                         case 1048:
1861                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1862                                 break;
1863                         case 2004: /* 2004: bracketed paste mode */
1864                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1865                                 break;
1866                         /* Not implemented mouse modes. See comments there. */
1867                         case 1001: /* mouse highlight mode; can hang the
1868                                       terminal by design when implemented. */
1869                         case 1005: /* UTF-8 mouse mode; will confuse
1870                                       applications not supporting UTF-8
1871                                       and luit. */
1872                         case 1015: /* urxvt mangled mouse mode; incompatible
1873                                       and can be mistaken for other control
1874                                       codes. */
1875                         default:
1876                                 fprintf(stderr,
1877                                         "erresc: unknown private set/reset mode %d\n",
1878                                         *args);
1879                                 break;
1880                         }
1881                 } else {
1882                         switch(*args) {
1883                         case 0:  /* Error (IGNORED) */
1884                                 break;
1885                         case 2:  /* KAM -- keyboard action */
1886                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1887                                 break;
1888                         case 4:  /* IRM -- Insertion-replacement */
1889                                 MODBIT(term.mode, set, MODE_INSERT);
1890                                 break;
1891                         case 12: /* SRM -- Send/Receive */
1892                                 MODBIT(term.mode, !set, MODE_ECHO);
1893                                 break;
1894                         case 20: /* LNM -- Linefeed/new line */
1895                                 MODBIT(term.mode, set, MODE_CRLF);
1896                                 break;
1897                         default:
1898                                 fprintf(stderr,
1899                                         "erresc: unknown set/reset mode %d\n",
1900                                         *args);
1901                                 break;
1902                         }
1903                 }
1904         }
1905 }
1906
1907 void
1908 csihandle(void) {
1909         char buf[40];
1910         int len;
1911
1912         switch(csiescseq.mode) {
1913         default:
1914         unknown:
1915                 fprintf(stderr, "erresc: unknown csi ");
1916                 csidump();
1917                 /* die(""); */
1918                 break;
1919         case '@': /* ICH -- Insert <n> blank char */
1920                 DEFAULT(csiescseq.arg[0], 1);
1921                 tinsertblank(csiescseq.arg[0]);
1922                 break;
1923         case 'A': /* CUU -- Cursor <n> Up */
1924                 DEFAULT(csiescseq.arg[0], 1);
1925                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1926                 break;
1927         case 'B': /* CUD -- Cursor <n> Down */
1928         case 'e': /* VPR --Cursor <n> Down */
1929                 DEFAULT(csiescseq.arg[0], 1);
1930                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1931                 break;
1932         case 'i': /* MC -- Media Copy */
1933                 switch(csiescseq.arg[0]) {
1934                 case 0:
1935                         tdump();
1936                         break;
1937                 case 1:
1938                         tdumpline(term.c.y);
1939                         break;
1940                 case 2:
1941                         tdumpsel();
1942                         break;
1943                 case 4:
1944                         term.mode &= ~MODE_PRINT;
1945                         break;
1946                 case 5:
1947                         term.mode |= MODE_PRINT;
1948                         break;
1949                 }
1950                 break;
1951         case 'c': /* DA -- Device Attributes */
1952                 if(csiescseq.arg[0] == 0)
1953                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1954                 break;
1955         case 'C': /* CUF -- Cursor <n> Forward */
1956         case 'a': /* HPR -- Cursor <n> Forward */
1957                 DEFAULT(csiescseq.arg[0], 1);
1958                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1959                 break;
1960         case 'D': /* CUB -- Cursor <n> Backward */
1961                 DEFAULT(csiescseq.arg[0], 1);
1962                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1963                 break;
1964         case 'E': /* CNL -- Cursor <n> Down and first col */
1965                 DEFAULT(csiescseq.arg[0], 1);
1966                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1967                 break;
1968         case 'F': /* CPL -- Cursor <n> Up and first col */
1969                 DEFAULT(csiescseq.arg[0], 1);
1970                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1971                 break;
1972         case 'g': /* TBC -- Tabulation clear */
1973                 switch(csiescseq.arg[0]) {
1974                 case 0: /* clear current tab stop */
1975                         term.tabs[term.c.x] = 0;
1976                         break;
1977                 case 3: /* clear all the tabs */
1978                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1979                         break;
1980                 default:
1981                         goto unknown;
1982                 }
1983                 break;
1984         case 'G': /* CHA -- Move to <col> */
1985         case '`': /* HPA */
1986                 DEFAULT(csiescseq.arg[0], 1);
1987                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1988                 break;
1989         case 'H': /* CUP -- Move to <row> <col> */
1990         case 'f': /* HVP */
1991                 DEFAULT(csiescseq.arg[0], 1);
1992                 DEFAULT(csiescseq.arg[1], 1);
1993                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1994                 break;
1995         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1996                 DEFAULT(csiescseq.arg[0], 1);
1997                 tputtab(csiescseq.arg[0]);
1998                 break;
1999         case 'J': /* ED -- Clear screen */
2000                 selclear(NULL);
2001                 switch(csiescseq.arg[0]) {
2002                 case 0: /* below */
2003                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2004                         if(term.c.y < term.row-1) {
2005                                 tclearregion(0, term.c.y+1, term.col-1,
2006                                                 term.row-1);
2007                         }
2008                         break;
2009                 case 1: /* above */
2010                         if(term.c.y > 1)
2011                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2012                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2013                         break;
2014                 case 2: /* all */
2015                         tclearregion(0, 0, term.col-1, term.row-1);
2016                         break;
2017                 default:
2018                         goto unknown;
2019                 }
2020                 break;
2021         case 'K': /* EL -- Clear line */
2022                 switch(csiescseq.arg[0]) {
2023                 case 0: /* right */
2024                         tclearregion(term.c.x, term.c.y, term.col-1,
2025                                         term.c.y);
2026                         break;
2027                 case 1: /* left */
2028                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2029                         break;
2030                 case 2: /* all */
2031                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2032                         break;
2033                 }
2034                 break;
2035         case 'S': /* SU -- Scroll <n> line up */
2036                 DEFAULT(csiescseq.arg[0], 1);
2037                 tscrollup(term.top, csiescseq.arg[0]);
2038                 break;
2039         case 'T': /* SD -- Scroll <n> line down */
2040                 DEFAULT(csiescseq.arg[0], 1);
2041                 tscrolldown(term.top, csiescseq.arg[0]);
2042                 break;
2043         case 'L': /* IL -- Insert <n> blank lines */
2044                 DEFAULT(csiescseq.arg[0], 1);
2045                 tinsertblankline(csiescseq.arg[0]);
2046                 break;
2047         case 'l': /* RM -- Reset Mode */
2048                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2049                 break;
2050         case 'M': /* DL -- Delete <n> lines */
2051                 DEFAULT(csiescseq.arg[0], 1);
2052                 tdeleteline(csiescseq.arg[0]);
2053                 break;
2054         case 'X': /* ECH -- Erase <n> char */
2055                 DEFAULT(csiescseq.arg[0], 1);
2056                 tclearregion(term.c.x, term.c.y,
2057                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2058                 break;
2059         case 'P': /* DCH -- Delete <n> char */
2060                 DEFAULT(csiescseq.arg[0], 1);
2061                 tdeletechar(csiescseq.arg[0]);
2062                 break;
2063         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2064                 DEFAULT(csiescseq.arg[0], 1);
2065                 tputtab(-csiescseq.arg[0]);
2066                 break;
2067         case 'd': /* VPA -- Move to <row> */
2068                 DEFAULT(csiescseq.arg[0], 1);
2069                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2070                 break;
2071         case 'h': /* SM -- Set terminal mode */
2072                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2073                 break;
2074         case 'm': /* SGR -- Terminal attribute (color) */
2075                 tsetattr(csiescseq.arg, csiescseq.narg);
2076                 break;
2077         case 'n': /* DSR – Device Status Report (cursor position) */
2078                 if (csiescseq.arg[0] == 6) {
2079                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2080                                         term.c.y+1, term.c.x+1);
2081                         ttywrite(buf, len);
2082                 }
2083                 break;
2084         case 'r': /* DECSTBM -- Set Scrolling Region */
2085                 if(csiescseq.priv) {
2086                         goto unknown;
2087                 } else {
2088                         DEFAULT(csiescseq.arg[0], 1);
2089                         DEFAULT(csiescseq.arg[1], term.row);
2090                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2091                         tmoveato(0, 0);
2092                 }
2093                 break;
2094         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2095                 tcursor(CURSOR_SAVE);
2096                 break;
2097         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2098                 tcursor(CURSOR_LOAD);
2099                 break;
2100         }
2101 }
2102
2103 void
2104 csidump(void) {
2105         int i;
2106         uint c;
2107
2108         printf("ESC[");
2109         for(i = 0; i < csiescseq.len; i++) {
2110                 c = csiescseq.buf[i] & 0xff;
2111                 if(isprint(c)) {
2112                         putchar(c);
2113                 } else if(c == '\n') {
2114                         printf("(\\n)");
2115                 } else if(c == '\r') {
2116                         printf("(\\r)");
2117                 } else if(c == 0x1b) {
2118                         printf("(\\e)");
2119                 } else {
2120                         printf("(%02x)", c);
2121                 }
2122         }
2123         putchar('\n');
2124 }
2125
2126 void
2127 csireset(void) {
2128         memset(&csiescseq, 0, sizeof(csiescseq));
2129 }
2130
2131 void
2132 strhandle(void) {
2133         char *p = NULL;
2134         int j, narg, par;
2135
2136         term.esc &= ~(ESC_STR_END|ESC_STR);
2137         strparse();
2138         narg = strescseq.narg;
2139         par = atoi(strescseq.args[0]);
2140
2141         switch(strescseq.type) {
2142         case ']': /* OSC -- Operating System Command */
2143                 switch(par) {
2144                 case 0:
2145                 case 1:
2146                 case 2:
2147                         if(narg > 1)
2148                                 xsettitle(strescseq.args[1]);
2149                         return;
2150                 case 4: /* color set */
2151                         if(narg < 3)
2152                                 break;
2153                         p = strescseq.args[2];
2154                         /* FALLTHROUGH */
2155                 case 104: /* color reset, here p = NULL */
2156                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2157                         if(xsetcolorname(j, p)) {
2158                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2159                         } else {
2160                                 /*
2161                                  * TODO if defaultbg color is changed, borders
2162                                  * are dirty
2163                                  */
2164                                 redraw(0);
2165                         }
2166                         return;
2167                 }
2168                 break;
2169         case 'k': /* old title set compatibility */
2170                 xsettitle(strescseq.args[0]);
2171                 return;
2172         case 'P': /* DCS -- Device Control String */
2173         case '_': /* APC -- Application Program Command */
2174         case '^': /* PM -- Privacy Message */
2175                 return;
2176         }
2177
2178         fprintf(stderr, "erresc: unknown str ");
2179         strdump();
2180 }
2181
2182 void
2183 strparse(void) {
2184         char *p = strescseq.buf;
2185
2186         strescseq.narg = 0;
2187         strescseq.buf[strescseq.len] = '\0';
2188         while(p && strescseq.narg < STR_ARG_SIZ)
2189                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2190 }
2191
2192 void
2193 strdump(void) {
2194         int i;
2195         uint c;
2196
2197         printf("ESC%c", strescseq.type);
2198         for(i = 0; i < strescseq.len; i++) {
2199                 c = strescseq.buf[i] & 0xff;
2200                 if(c == '\0') {
2201                         return;
2202                 } else if(isprint(c)) {
2203                         putchar(c);
2204                 } else if(c == '\n') {
2205                         printf("(\\n)");
2206                 } else if(c == '\r') {
2207                         printf("(\\r)");
2208                 } else if(c == 0x1b) {
2209                         printf("(\\e)");
2210                 } else {
2211                         printf("(%02x)", c);
2212                 }
2213         }
2214         printf("ESC\\\n");
2215 }
2216
2217 void
2218 strreset(void) {
2219         memset(&strescseq, 0, sizeof(strescseq));
2220 }
2221
2222 void
2223 tprinter(char *s, size_t len) {
2224         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2225                 fprintf(stderr, "Error writing in %s:%s\n",
2226                         opt_io, strerror(errno));
2227                 close(iofd);
2228                 iofd = -1;
2229         }
2230 }
2231
2232 void
2233 toggleprinter(const Arg *arg) {
2234         term.mode ^= MODE_PRINT;
2235 }
2236
2237 void
2238 printscreen(const Arg *arg) {
2239         tdump();
2240 }
2241
2242 void
2243 printsel(const Arg *arg) {
2244         tdumpsel();
2245 }
2246
2247 void
2248 tdumpsel(void) {
2249         char *ptr;
2250
2251         if((ptr = getsel())) {
2252                 tprinter(ptr, strlen(ptr));
2253                 free(ptr);
2254         }
2255 }
2256
2257 void
2258 tdumpline(int n) {
2259         Glyph *bp, *end;
2260
2261         bp = &term.line[n][0];
2262         end = &bp[term.col-1];
2263         while(end > bp && !strcmp(" ", end->c))
2264                 --end;
2265         if(bp != end || strcmp(bp->c, " ")) {
2266                 for( ;bp <= end; ++bp)
2267                         tprinter(bp->c, strlen(bp->c));
2268         }
2269         tprinter("\n", 1);
2270 }
2271
2272 void
2273 tdump(void) {
2274         int i;
2275
2276         for(i = 0; i < term.row; ++i)
2277                 tdumpline(i);
2278 }
2279
2280 void
2281 tputtab(int n) {
2282         uint x = term.c.x;
2283
2284         if(n > 0) {
2285                 while(x < term.col && n--)
2286                         for(++x; x < term.col && !term.tabs[x]; ++x)
2287                                 /* nothing */ ;
2288         } else if(n < 0) {
2289                 while(x > 0 && n++)
2290                         for(--x; x > 0 && !term.tabs[x]; --x)
2291                                 /* nothing */ ;
2292         }
2293         tmoveto(x, term.c.y);
2294 }
2295
2296 void
2297 techo(char *buf, int len) {
2298         for(; len > 0; buf++, len--) {
2299                 char c = *buf;
2300
2301                 if(ISCONTROL(c)) { /* control code */
2302                         if(c & 0x80) {
2303                                 c &= 0x7f;
2304                                 tputc("^", 1);
2305                                 tputc("[", 1);
2306                         } else if(c != '\n' && c != '\r' && c != '\t') {
2307                                 c ^= '\x40';
2308                                 tputc("^", 1);
2309                         }
2310                         tputc(&c, 1);
2311                 } else {
2312                         break;
2313                 }
2314         }
2315         if(len)
2316                 tputc(buf, len);
2317 }
2318
2319 void
2320 tdeftran(char ascii) {
2321         char c, (*bp)[2];
2322         static char tbl[][2] = {
2323                 {'0', CS_GRAPHIC0}, {'B', CS_USA},
2324                 {0, 0}
2325         };
2326
2327         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2328                 /* nothing */;
2329
2330         if (c == 0)
2331                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2332         else
2333                 term.trantbl[term.icharset] = (*bp)[1];
2334 }
2335
2336 void
2337 tcontrolcode(uchar ascii) {
2338         static char question[UTF_SIZ] = "?";
2339
2340         switch(ascii) {
2341         case '\t':   /* HT */
2342                 tputtab(1);
2343                 return;
2344         case '\b':   /* BS */
2345                 tmoveto(term.c.x-1, term.c.y);
2346                 return;
2347         case '\r':   /* CR */
2348                 tmoveto(0, term.c.y);
2349                 return;
2350         case '\f':   /* LF */
2351         case '\v':   /* VT */
2352         case '\n':   /* LF */
2353                 /* go to first col if the mode is set */
2354                 tnewline(IS_SET(MODE_CRLF));
2355                 return;
2356         case '\a':   /* BEL */
2357                 if(term.esc & ESC_STR_END) {
2358                         /* backwards compatibility to xterm */
2359                         strhandle();
2360                 } else {
2361                         if(!(xw.state & WIN_FOCUSED))
2362                                 xseturgency(1);
2363                         if (bellvolume)
2364                                 XBell(xw.dpy, bellvolume);
2365                 }
2366                 break;
2367         case '\033': /* ESC */
2368                 csireset();
2369                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2370                 term.esc |= ESC_START;
2371                 return;
2372         case '\016': /* SO */
2373                 term.charset = 0;
2374                 return;
2375         case '\017': /* SI */
2376                 term.charset = 1;
2377                 return;
2378         case '\032': /* SUB */
2379                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2380         case '\030': /* CAN */
2381                 csireset();
2382                 break;
2383         case '\005': /* ENQ (IGNORED) */
2384         case '\000': /* NUL (IGNORED) */
2385         case '\021': /* XON (IGNORED) */
2386         case '\023': /* XOFF (IGNORED) */
2387         case 0177:   /* DEL (IGNORED) */
2388                 return;
2389         case 0x84:   /* TODO: IND */
2390         case 0x85:   /* TODO: NEL */
2391         case 0x88:   /* TODO: HTS */
2392         case 0x8d:   /* TODO: RI */
2393         case 0x8e:   /* TODO: SS2 */
2394         case 0x8f:   /* TODO: SS3 */
2395         case 0x90:   /* TODO: DCS */
2396         case 0x98:   /* TODO: SOS */
2397         case 0x9a:   /* TODO: DECID */
2398         case 0x9b:   /* TODO: CSI */
2399         case 0x9c:   /* TODO: ST */
2400         case 0x9d:   /* TODO: OSC */
2401         case 0x9e:   /* TODO: PM */
2402         case 0x9f:   /* TODO: APC */
2403                 break;
2404         }
2405         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2406         term.esc &= ~(ESC_STR_END|ESC_STR);
2407         return;
2408 }
2409
2410 void
2411 tdectest(char c) {
2412         static char E[UTF_SIZ] = "E";
2413         int x, y;
2414
2415         if(c == '8') { /* DEC screen alignment test. */
2416                 for(x = 0; x < term.col; ++x) {
2417                         for(y = 0; y < term.row; ++y)
2418                                 tsetchar(E, &term.c.attr, x, y);
2419                 }
2420         }
2421 }
2422
2423 void
2424 tputc(char *c, int len) {
2425         uchar ascii;
2426         bool control;
2427         long unicodep;
2428         int width;
2429         Glyph *gp;
2430
2431         if(len == 1) {
2432                 width = 1;
2433                 unicodep = ascii = *c;
2434         } else {
2435                 utf8decode(c, &unicodep, UTF_SIZ);
2436                 width = wcwidth(unicodep);
2437                 control = ISCONTROLC1(unicodep);
2438                 ascii = unicodep;
2439         }
2440
2441         if(IS_SET(MODE_PRINT))
2442                 tprinter(c, len);
2443         control = ISCONTROL(unicodep);
2444
2445         /*
2446          * STR sequence must be checked before anything else
2447          * because it uses all following characters until it
2448          * receives a ESC, a SUB, a ST or any other C1 control
2449          * character.
2450          */
2451         if(term.esc & ESC_STR) {
2452                 if(width == 1 &&
2453                    (ascii == '\a' || ascii == 030 ||
2454                     ascii == 032  || ascii == 033 ||
2455                     ISCONTROLC1(unicodep))) {
2456                         term.esc &= ~(ESC_START|ESC_STR);
2457                         term.esc |= ESC_STR_END;
2458                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2459                         memmove(&strescseq.buf[strescseq.len], c, len);
2460                         strescseq.len += len;
2461                         return;
2462                 } else {
2463                 /*
2464                  * Here is a bug in terminals. If the user never sends
2465                  * some code to stop the str or esc command, then st
2466                  * will stop responding. But this is better than
2467                  * silently failing with unknown characters. At least
2468                  * then users will report back.
2469                  *
2470                  * In the case users ever get fixed, here is the code:
2471                  */
2472                 /*
2473                  * term.esc = 0;
2474                  * strhandle();
2475                  */
2476                         return;
2477                 }
2478         }
2479
2480         /*
2481          * Actions of control codes must be performed as soon they arrive
2482          * because they can be embedded inside a control sequence, and
2483          * they must not cause conflicts with sequences.
2484          */
2485         if(control) {
2486                 tcontrolcode(ascii);
2487                 /*
2488                  * control codes are not shown ever
2489                  */
2490                 return;
2491         } else if(term.esc & ESC_START) {
2492                 if(term.esc & ESC_CSI) {
2493                         csiescseq.buf[csiescseq.len++] = ascii;
2494                         if(BETWEEN(ascii, 0x40, 0x7E)
2495                                         || csiescseq.len >= \
2496                                         sizeof(csiescseq.buf)-1) {
2497                                 term.esc = 0;
2498                                 csiparse();
2499                                 csihandle();
2500                         }
2501                         return;
2502                 } else if(term.esc & ESC_ALTCHARSET) {
2503                         tdeftran(ascii);
2504                 } else if(term.esc & ESC_TEST) {
2505                         tdectest(ascii);
2506                 } else {
2507                         switch(ascii) {
2508                         case '[':
2509                                 term.esc |= ESC_CSI;
2510                                 return;
2511                         case '#':
2512                                 term.esc |= ESC_TEST;
2513                                 return;
2514                         case 'P': /* DCS -- Device Control String */
2515                         case '_': /* APC -- Application Program Command */
2516                         case '^': /* PM -- Privacy Message */
2517                         case ']': /* OSC -- Operating System Command */
2518                         case 'k': /* old title set compatibility */
2519                                 strreset();
2520                                 strescseq.type = ascii;
2521                                 term.esc |= ESC_STR;
2522                                 return;
2523                         case '(': /* set primary charset G0 */
2524                         case ')': /* set secondary charset G1 */
2525                         case '*': /* set tertiary charset G2 */
2526                         case '+': /* set quaternary charset G3 */
2527                                 term.icharset = ascii - '(';
2528                                 term.esc |= ESC_ALTCHARSET;
2529                                 return;
2530                         case 'D': /* IND -- Linefeed */
2531                                 if(term.c.y == term.bot) {
2532                                         tscrollup(term.top, 1);
2533                                 } else {
2534                                         tmoveto(term.c.x, term.c.y+1);
2535                                 }
2536                                 break;
2537                         case 'E': /* NEL -- Next line */
2538                                 tnewline(1); /* always go to first col */
2539                                 break;
2540                         case 'H': /* HTS -- Horizontal tab stop */
2541                                 term.tabs[term.c.x] = 1;
2542                                 break;
2543                         case 'M': /* RI -- Reverse index */
2544                                 if(term.c.y == term.top) {
2545                                         tscrolldown(term.top, 1);
2546                                 } else {
2547                                         tmoveto(term.c.x, term.c.y-1);
2548                                 }
2549                                 break;
2550                         case 'Z': /* DECID -- Identify Terminal */
2551                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2552                                 break;
2553                         case 'c': /* RIS -- Reset to inital state */
2554                                 treset();
2555                                 xresettitle();
2556                                 xloadcols();
2557                                 break;
2558                         case '=': /* DECPAM -- Application keypad */
2559                                 term.mode |= MODE_APPKEYPAD;
2560                                 break;
2561                         case '>': /* DECPNM -- Normal keypad */
2562                                 term.mode &= ~MODE_APPKEYPAD;
2563                                 break;
2564                         case '7': /* DECSC -- Save Cursor */
2565                                 tcursor(CURSOR_SAVE);
2566                                 break;
2567                         case '8': /* DECRC -- Restore Cursor */
2568                                 tcursor(CURSOR_LOAD);
2569                                 break;
2570                         case '\\': /* ST -- String Terminator */
2571                                 if(term.esc & ESC_STR_END)
2572                                         strhandle();
2573                                 break;
2574                         default:
2575                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2576                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2577                                 break;
2578                         }
2579                 }
2580                 term.esc = 0;
2581                 /*
2582                  * All characters which form part of a sequence are not
2583                  * printed
2584                  */
2585                 return;
2586         }
2587         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2588                 selclear(NULL);
2589
2590         gp = &term.line[term.c.y][term.c.x];
2591         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2592                 gp->mode |= ATTR_WRAP;
2593                 tnewline(1);
2594         }
2595
2596         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2597                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2598
2599         if(term.c.x+width > term.col)
2600                 tnewline(1);
2601
2602         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2603
2604         if(width == 2) {
2605                 gp->mode |= ATTR_WIDE;
2606                 if(term.c.x+1 < term.col) {
2607                         gp[1].c[0] = '\0';
2608                         gp[1].mode = ATTR_WDUMMY;
2609                 }
2610         }
2611         if(term.c.x+width < term.col) {
2612                 tmoveto(term.c.x+width, term.c.y);
2613         } else {
2614                 term.c.state |= CURSOR_WRAPNEXT;
2615         }
2616 }
2617
2618 int
2619 tresize(int col, int row) {
2620         int i;
2621         int minrow = MIN(row, term.row);
2622         int mincol = MIN(col, term.col);
2623         int slide = term.c.y - row + 1;
2624         bool *bp;
2625         Line *orig;
2626         TCursor c;
2627
2628         if(col < 1 || row < 1)
2629                 return 0;
2630
2631         /* free unneeded rows */
2632         i = 0;
2633         if(slide > 0) {
2634                 /*
2635                  * slide screen to keep cursor where we expect it -
2636                  * tscrollup would work here, but we can optimize to
2637                  * memmove because we're freeing the earlier lines
2638                  */
2639                 for(/* i = 0 */; i < slide; i++) {
2640                         free(term.line[i]);
2641                         free(term.alt[i]);
2642                 }
2643                 memmove(term.line, term.line + slide, row * sizeof(Line));
2644                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2645         }
2646         for(i += row; i < term.row; i++) {
2647                 free(term.line[i]);
2648                 free(term.alt[i]);
2649         }
2650
2651         /* resize to new height */
2652         term.line = xrealloc(term.line, row * sizeof(Line));
2653         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2654         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2655         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2656
2657         /* resize each row to new width, zero-pad if needed */
2658         for(i = 0; i < minrow; i++) {
2659                 term.dirty[i] = 1;
2660                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2661                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2662         }
2663
2664         /* allocate any new rows */
2665         for(/* i == minrow */; i < row; i++) {
2666                 term.dirty[i] = 1;
2667                 term.line[i] = xmalloc(col * sizeof(Glyph));
2668                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2669         }
2670         if(col > term.col) {
2671                 bp = term.tabs + term.col;
2672
2673                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2674                 while(--bp > term.tabs && !*bp)
2675                         /* nothing */ ;
2676                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2677                         *bp = 1;
2678         }
2679         /* update terminal size */
2680         term.col = col;
2681         term.row = row;
2682         /* reset scrolling region */
2683         tsetscroll(0, row-1);
2684         /* make use of the LIMIT in tmoveto */
2685         tmoveto(term.c.x, term.c.y);
2686         /* Clearing both screens */
2687         orig = term.line;
2688         c = term.c;
2689         do {
2690                 if(mincol < col && 0 < minrow) {
2691                         tclearregion(mincol, 0, col - 1, minrow - 1);
2692                 }
2693                 if(0 < col && minrow < row) {
2694                         tclearregion(0, minrow, col - 1, row - 1);
2695                 }
2696                 tswapscreen();
2697                 tcursor(CURSOR_LOAD);
2698         } while(orig != term.line);
2699         term.c = c;
2700
2701         return (slide > 0);
2702 }
2703
2704 void
2705 xresize(int col, int row) {
2706         xw.tw = MAX(1, col * xw.cw);
2707         xw.th = MAX(1, row * xw.ch);
2708
2709         XFreePixmap(xw.dpy, xw.buf);
2710         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2711                         DefaultDepth(xw.dpy, xw.scr));
2712         XftDrawChange(xw.draw, xw.buf);
2713         xclear(0, 0, xw.w, xw.h);
2714 }
2715
2716 static inline ushort
2717 sixd_to_16bit(int x) {
2718         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2719 }
2720
2721 void
2722 xloadcols(void) {
2723         int i;
2724         XRenderColor color = { .alpha = 0xffff };
2725         static bool loaded;
2726         Color *cp;
2727
2728         if(loaded) {
2729                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2730                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2731         }
2732
2733         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2734         for(i = 0; i < LEN(colorname); i++) {
2735                 if(!colorname[i])
2736                         continue;
2737                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2738                         die("Could not allocate color '%s'\n", colorname[i]);
2739                 }
2740         }
2741
2742         /* load colors [16-231] ; same colors as xterm */
2743         for(i = 16; i < 6*6*6+16; i++) {
2744                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2745                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2746                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2747                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2748                         die("Could not allocate color %d\n", i);
2749         }
2750
2751         /* load colors [232-255] ; grayscale */
2752         for(; i < 256; i++) {
2753                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2754                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2755                         die("Could not allocate color %d\n", i);
2756         }
2757         loaded = true;
2758 }
2759
2760 int
2761 xsetcolorname(int x, const char *name) {
2762         XRenderColor color = { .alpha = 0xffff };
2763         Color ncolor;
2764
2765         if(!BETWEEN(x, 0, LEN(colorname)))
2766                 return 1;
2767
2768         if(!name) {
2769                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2770                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2771                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2772                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2773                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2774                                                 xw.cmap, &color, &ncolor)) {
2775                                 return 1;
2776                         }
2777
2778                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2779                         dc.col[x] = ncolor;
2780                         return 0;
2781                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2782                         color.red = color.green = color.blue = \
2783                                     0x0808 + 0x0a0a * (x - (16 + 216));
2784                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2785                                                 xw.cmap, &color, &ncolor)) {
2786                                 return 1;
2787                         }
2788
2789                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2790                         dc.col[x] = ncolor;
2791                         return 0;
2792                 } else { /* system colors */
2793                         name = colorname[x];
2794                 }
2795         }
2796         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2797                 return 1;
2798
2799         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2800         dc.col[x] = ncolor;
2801         return 0;
2802 }
2803
2804 void
2805 xtermclear(int col1, int row1, int col2, int row2) {
2806         XftDrawRect(xw.draw,
2807                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2808                         borderpx + col1 * xw.cw,
2809                         borderpx + row1 * xw.ch,
2810                         (col2-col1+1) * xw.cw,
2811                         (row2-row1+1) * xw.ch);
2812 }
2813
2814 /*
2815  * Absolute coordinates.
2816  */
2817 void
2818 xclear(int x1, int y1, int x2, int y2) {
2819         XftDrawRect(xw.draw,
2820                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2821                         x1, y1, x2-x1, y2-y1);
2822 }
2823
2824 void
2825 xhints(void) {
2826         XClassHint class = {opt_class ? opt_class : termname, termname};
2827         XWMHints wm = {.flags = InputHint, .input = 1};
2828         XSizeHints *sizeh = NULL;
2829
2830         sizeh = XAllocSizeHints();
2831
2832         sizeh->flags = PSize | PResizeInc | PBaseSize;
2833         sizeh->height = xw.h;
2834         sizeh->width = xw.w;
2835         sizeh->height_inc = xw.ch;
2836         sizeh->width_inc = xw.cw;
2837         sizeh->base_height = 2 * borderpx;
2838         sizeh->base_width = 2 * borderpx;
2839         if(xw.isfixed == True) {
2840                 sizeh->flags |= PMaxSize | PMinSize;
2841                 sizeh->min_width = sizeh->max_width = xw.w;
2842                 sizeh->min_height = sizeh->max_height = xw.h;
2843         }
2844         if(xw.gm & (XValue|YValue)) {
2845                 sizeh->flags |= USPosition | PWinGravity;
2846                 sizeh->x = xw.l;
2847                 sizeh->y = xw.t;
2848                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2849         }
2850
2851         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2852                         &class);
2853         XFree(sizeh);
2854 }
2855
2856 int
2857 xgeommasktogravity(int mask) {
2858         switch(mask & (XNegative|YNegative)) {
2859         case 0:
2860                 return NorthWestGravity;
2861         case XNegative:
2862                 return NorthEastGravity;
2863         case YNegative:
2864                 return SouthWestGravity;
2865         }
2866         return SouthEastGravity;
2867 }
2868
2869 int
2870 xloadfont(Font *f, FcPattern *pattern) {
2871         FcPattern *match;
2872         FcResult result;
2873
2874         match = FcFontMatch(NULL, pattern, &result);
2875         if(!match)
2876                 return 1;
2877
2878         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2879                 FcPatternDestroy(match);
2880                 return 1;
2881         }
2882
2883         f->set = NULL;
2884         f->pattern = FcPatternDuplicate(pattern);
2885
2886         f->ascent = f->match->ascent;
2887         f->descent = f->match->descent;
2888         f->lbearing = 0;
2889         f->rbearing = f->match->max_advance_width;
2890
2891         f->height = f->ascent + f->descent;
2892         f->width = f->lbearing + f->rbearing;
2893
2894         return 0;
2895 }
2896
2897 void
2898 xloadfonts(char *fontstr, double fontsize) {
2899         FcPattern *pattern;
2900         FcResult r_sz, r_psz;
2901         double fontval;
2902
2903         if(fontstr[0] == '-') {
2904                 pattern = XftXlfdParse(fontstr, False, False);
2905         } else {
2906                 pattern = FcNameParse((FcChar8 *)fontstr);
2907         }
2908
2909         if(!pattern)
2910                 die("st: can't open font %s\n", fontstr);
2911
2912         if(fontsize > 0) {
2913                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2914                 FcPatternDel(pattern, FC_SIZE);
2915                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2916                 usedfontsize = fontsize;
2917         } else {
2918                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2919                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2920                 if(r_psz == FcResultMatch) {
2921                         usedfontsize = fontval;
2922                 } else if(r_sz == FcResultMatch) {
2923                         usedfontsize = -1;
2924                 } else {
2925                         /*
2926                          * Default font size is 12, if none given. This is to
2927                          * have a known usedfontsize value.
2928                          */
2929                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2930                         usedfontsize = 12;
2931                 }
2932         }
2933
2934         FcConfigSubstitute(0, pattern, FcMatchPattern);
2935         FcDefaultSubstitute(pattern);
2936
2937         if(xloadfont(&dc.font, pattern))
2938                 die("st: can't open font %s\n", fontstr);
2939
2940         if(usedfontsize < 0) {
2941                 FcPatternGetDouble(dc.font.match->pattern,
2942                                    FC_PIXEL_SIZE, 0, &fontval);
2943                 usedfontsize = fontval;
2944         }
2945
2946         /* Setting character width and height. */
2947         xw.cw = CEIL(dc.font.width * cwscale);
2948         xw.ch = CEIL(dc.font.height * chscale);
2949
2950         FcPatternDel(pattern, FC_SLANT);
2951         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2952         if(xloadfont(&dc.ifont, pattern))
2953                 die("st: can't open font %s\n", fontstr);
2954
2955         FcPatternDel(pattern, FC_WEIGHT);
2956         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2957         if(xloadfont(&dc.ibfont, pattern))
2958                 die("st: can't open font %s\n", fontstr);
2959
2960         FcPatternDel(pattern, FC_SLANT);
2961         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2962         if(xloadfont(&dc.bfont, pattern))
2963                 die("st: can't open font %s\n", fontstr);
2964
2965         FcPatternDestroy(pattern);
2966 }
2967
2968 int
2969 xloadfontset(Font *f) {
2970         FcResult result;
2971
2972         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2973                 return 1;
2974         return 0;
2975 }
2976
2977 void
2978 xunloadfont(Font *f) {
2979         XftFontClose(xw.dpy, f->match);
2980         FcPatternDestroy(f->pattern);
2981         if(f->set)
2982                 FcFontSetDestroy(f->set);
2983 }
2984
2985 void
2986 xunloadfonts(void) {
2987         /* Free the loaded fonts in the font cache.  */
2988         while(frclen > 0)
2989                 XftFontClose(xw.dpy, frc[--frclen].font);
2990
2991         xunloadfont(&dc.font);
2992         xunloadfont(&dc.bfont);
2993         xunloadfont(&dc.ifont);
2994         xunloadfont(&dc.ibfont);
2995 }
2996
2997 void
2998 xzoom(const Arg *arg) {
2999         xunloadfonts();
3000         xloadfonts(usedfont, usedfontsize + arg->i);
3001         cresize(0, 0);
3002         redraw(0);
3003 }
3004
3005 void
3006 xinit(void) {
3007         XGCValues gcvalues;
3008         Cursor cursor;
3009         Window parent;
3010         pid_t thispid = getpid();
3011
3012         if(!(xw.dpy = XOpenDisplay(NULL)))
3013                 die("Can't open display\n");
3014         xw.scr = XDefaultScreen(xw.dpy);
3015         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3016
3017         /* font */
3018         if(!FcInit())
3019                 die("Could not init fontconfig.\n");
3020
3021         usedfont = (opt_font == NULL)? font : opt_font;
3022         xloadfonts(usedfont, 0);
3023
3024         /* colors */
3025         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3026         xloadcols();
3027
3028         /* adjust fixed window geometry */
3029         xw.w = 2 * borderpx + term.col * xw.cw;
3030         xw.h = 2 * borderpx + term.row * xw.ch;
3031         if(xw.gm & XNegative)
3032                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3033         if(xw.gm & YNegative)
3034                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3035
3036         /* Events */
3037         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3038         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3039         xw.attrs.bit_gravity = NorthWestGravity;
3040         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3041                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3042                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3043         xw.attrs.colormap = xw.cmap;
3044
3045         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3046                         XRootWindow(xw.dpy, xw.scr);
3047         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3048                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3049                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3050                         | CWEventMask | CWColormap, &xw.attrs);
3051
3052         memset(&gcvalues, 0, sizeof(gcvalues));
3053         gcvalues.graphics_exposures = False;
3054         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3055                         &gcvalues);
3056         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3057                         DefaultDepth(xw.dpy, xw.scr));
3058         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3059         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3060
3061         /* Xft rendering context */
3062         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3063
3064         /* input methods */
3065         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3066                 XSetLocaleModifiers("@im=local");
3067                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3068                         XSetLocaleModifiers("@im=");
3069                         if((xw.xim = XOpenIM(xw.dpy,
3070                                         NULL, NULL, NULL)) == NULL) {
3071                                 die("XOpenIM failed. Could not open input"
3072                                         " device.\n");
3073                         }
3074                 }
3075         }
3076         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3077                                            | XIMStatusNothing, XNClientWindow, xw.win,
3078                                            XNFocusWindow, xw.win, NULL);
3079         if(xw.xic == NULL)
3080                 die("XCreateIC failed. Could not obtain input method.\n");
3081
3082         /* white cursor, black outline */
3083         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3084         XDefineCursor(xw.dpy, xw.win, cursor);
3085         XRecolorCursor(xw.dpy, cursor,
3086                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3087                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3088
3089         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3090         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3091         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3092         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3093
3094         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3095         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3096                         PropModeReplace, (uchar *)&thispid, 1);
3097
3098         xresettitle();
3099         XMapWindow(xw.dpy, xw.win);
3100         xhints();
3101         XSync(xw.dpy, False);
3102 }
3103
3104 void
3105 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3106         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3107             width = charlen * xw.cw, xp, i;
3108         int frcflags;
3109         int u8fl, u8fblen, u8cblen, doesexist;
3110         char *u8c, *u8fs;
3111         long unicodep;
3112         Font *font = &dc.font;
3113         FcResult fcres;
3114         FcPattern *fcpattern, *fontpattern;
3115         FcFontSet *fcsets[] = { NULL };
3116         FcCharSet *fccharset;
3117         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3118         XRenderColor colfg, colbg;
3119         XRectangle r;
3120         int oneatatime;
3121
3122         frcflags = FRC_NORMAL;
3123
3124         if(base.mode & ATTR_ITALIC) {
3125                 if(base.fg == defaultfg)
3126                         base.fg = defaultitalic;
3127                 font = &dc.ifont;
3128                 frcflags = FRC_ITALIC;
3129         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3130                 if(base.fg == defaultfg)
3131                         base.fg = defaultitalic;
3132                 font = &dc.ibfont;
3133                 frcflags = FRC_ITALICBOLD;
3134         } else if(base.mode & ATTR_UNDERLINE) {
3135                 if(base.fg == defaultfg)
3136                         base.fg = defaultunderline;
3137         }
3138
3139         if(IS_TRUECOL(base.fg)) {
3140                 colfg.alpha = 0xffff;
3141                 colfg.red = TRUERED(base.fg);
3142                 colfg.green = TRUEGREEN(base.fg);
3143                 colfg.blue = TRUEBLUE(base.fg);
3144                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3145                 fg = &truefg;
3146         } else {
3147                 fg = &dc.col[base.fg];
3148         }
3149
3150         if(IS_TRUECOL(base.bg)) {
3151                 colbg.alpha = 0xffff;
3152                 colbg.green = TRUEGREEN(base.bg);
3153                 colbg.red = TRUERED(base.bg);
3154                 colbg.blue = TRUEBLUE(base.bg);
3155                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3156                 bg = &truebg;
3157         } else {
3158                 bg = &dc.col[base.bg];
3159         }
3160
3161         if(base.mode & ATTR_BOLD) {
3162                 /*
3163                  * change basic system colors [0-7]
3164                  * to bright system colors [8-15]
3165                  */
3166                 if(BETWEEN(base.fg, 0, 7))
3167                         fg = &dc.col[base.fg + 8];
3168
3169                 if(base.mode & ATTR_ITALIC) {
3170                         font = &dc.ibfont;
3171                         frcflags = FRC_ITALICBOLD;
3172                 } else {
3173                         font = &dc.bfont;
3174                         frcflags = FRC_BOLD;
3175                 }
3176         }
3177
3178         if(IS_SET(MODE_REVERSE)) {
3179                 if(fg == &dc.col[defaultfg]) {
3180                         fg = &dc.col[defaultbg];
3181                 } else {
3182                         colfg.red = ~fg->color.red;
3183                         colfg.green = ~fg->color.green;
3184                         colfg.blue = ~fg->color.blue;
3185                         colfg.alpha = fg->color.alpha;
3186                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3187                                         &revfg);
3188                         fg = &revfg;
3189                 }
3190
3191                 if(bg == &dc.col[defaultbg]) {
3192                         bg = &dc.col[defaultfg];
3193                 } else {
3194                         colbg.red = ~bg->color.red;
3195                         colbg.green = ~bg->color.green;
3196                         colbg.blue = ~bg->color.blue;
3197                         colbg.alpha = bg->color.alpha;
3198                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3199                                         &revbg);
3200                         bg = &revbg;
3201                 }
3202         }
3203
3204         if(base.mode & ATTR_REVERSE) {
3205                 temp = fg;
3206                 fg = bg;
3207                 bg = temp;
3208         }
3209
3210         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3211                 fg = bg;
3212
3213         /* Intelligent cleaning up of the borders. */
3214         if(x == 0) {
3215                 xclear(0, (y == 0)? 0 : winy, borderpx,
3216                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3217         }
3218         if(x + charlen >= term.col) {
3219                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3220                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3221         }
3222         if(y == 0)
3223                 xclear(winx, 0, winx + width, borderpx);
3224         if(y == term.row-1)
3225                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3226
3227         /* Clean up the region we want to draw to. */
3228         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3229
3230         /* Set the clip region because Xft is sometimes dirty. */
3231         r.x = 0;
3232         r.y = 0;
3233         r.height = xw.ch;
3234         r.width = width;
3235         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3236
3237         for(xp = winx; bytelen > 0;) {
3238                 /*
3239                  * Search for the range in the to be printed string of glyphs
3240                  * that are in the main font. Then print that range. If
3241                  * some glyph is found that is not in the font, do the
3242                  * fallback dance.
3243                  */
3244                 u8fs = s;
3245                 u8fblen = 0;
3246                 u8fl = 0;
3247                 oneatatime = font->width != xw.cw;
3248                 for(;;) {
3249                         u8c = s;
3250                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3251                         s += u8cblen;
3252                         bytelen -= u8cblen;
3253
3254                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3255                         if(oneatatime || !doesexist || bytelen <= 0) {
3256                                 if(oneatatime || bytelen <= 0) {
3257                                         if(doesexist) {
3258                                                 u8fl++;
3259                                                 u8fblen += u8cblen;
3260                                         }
3261                                 }
3262
3263                                 if(u8fl > 0) {
3264                                         XftDrawStringUtf8(xw.draw, fg,
3265                                                         font->match, xp,
3266                                                         winy + font->ascent,
3267                                                         (FcChar8 *)u8fs,
3268                                                         u8fblen);
3269                                         xp += xw.cw * u8fl;
3270
3271                                 }
3272                                 break;
3273                         }
3274
3275                         u8fl++;
3276                         u8fblen += u8cblen;
3277                 }
3278                 if(doesexist) {
3279                         if(oneatatime)
3280                                 continue;
3281                         break;
3282                 }
3283
3284                 /* Search the font cache. */
3285                 for(i = 0; i < frclen; i++) {
3286                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3287                                         && frc[i].flags == frcflags) {
3288                                 break;
3289                         }
3290                 }
3291
3292                 /* Nothing was found. */
3293                 if(i >= frclen) {
3294                         if(!font->set)
3295                                 xloadfontset(font);
3296                         fcsets[0] = font->set;
3297
3298                         /*
3299                          * Nothing was found in the cache. Now use
3300                          * some dozen of Fontconfig calls to get the
3301                          * font for one single character.
3302                          *
3303                          * Xft and fontconfig are design failures.
3304                          */
3305                         fcpattern = FcPatternDuplicate(font->pattern);
3306                         fccharset = FcCharSetCreate();
3307
3308                         FcCharSetAddChar(fccharset, unicodep);
3309                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3310                                         fccharset);
3311                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3312                                         FcTrue);
3313
3314                         FcConfigSubstitute(0, fcpattern,
3315                                         FcMatchPattern);
3316                         FcDefaultSubstitute(fcpattern);
3317
3318                         fontpattern = FcFontSetMatch(0, fcsets,
3319                                         FcTrue, fcpattern, &fcres);
3320
3321                         /*
3322                          * Overwrite or create the new cache entry.
3323                          */
3324                         if(frclen >= LEN(frc)) {
3325                                 frclen = LEN(frc) - 1;
3326                                 XftFontClose(xw.dpy, frc[frclen].font);
3327                         }
3328
3329                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3330                                         fontpattern);
3331                         frc[frclen].flags = frcflags;
3332
3333                         i = frclen;
3334                         frclen++;
3335
3336                         FcPatternDestroy(fcpattern);
3337                         FcCharSetDestroy(fccharset);
3338                 }
3339
3340                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3341                                 xp, winy + frc[i].font->ascent,
3342                                 (FcChar8 *)u8c, u8cblen);
3343
3344                 xp += xw.cw * wcwidth(unicodep);
3345         }
3346
3347         /*
3348          * This is how the loop above actually should be. Why does the
3349          * application have to care about font details?
3350          *
3351          * I have to repeat: Xft and Fontconfig are design failures.
3352          */
3353         /*
3354         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3355                         winy + font->ascent, (FcChar8 *)s, bytelen);
3356         */
3357
3358         if(base.mode & ATTR_UNDERLINE) {
3359                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3360                                 width, 1);
3361         }
3362
3363         /* Reset clip to none. */
3364         XftDrawSetClip(xw.draw, 0);
3365 }
3366
3367 void
3368 xdrawcursor(void) {
3369         static int oldx = 0, oldy = 0;
3370         int sl, width, curx;
3371         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3372
3373         LIMIT(oldx, 0, term.col-1);
3374         LIMIT(oldy, 0, term.row-1);
3375
3376         curx = term.c.x;
3377
3378         /* adjust position if in dummy */
3379         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3380                 oldx--;
3381         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3382                 curx--;
3383
3384         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3385
3386         /* remove the old cursor */
3387         sl = utf8len(term.line[oldy][oldx].c);
3388         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3389         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3390                         oldy, width, sl);
3391
3392         /* draw the new one */
3393         if(!(IS_SET(MODE_HIDE))) {
3394                 if(xw.state & WIN_FOCUSED) {
3395                         if(IS_SET(MODE_REVERSE)) {
3396                                 g.mode |= ATTR_REVERSE;
3397                                 g.fg = defaultcs;
3398                                 g.bg = defaultfg;
3399                         }
3400
3401                         sl = utf8len(g.c);
3402                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3403                                 ? 2 : 1;
3404                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3405                 } else {
3406                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3407                                         borderpx + curx * xw.cw,
3408                                         borderpx + term.c.y * xw.ch,
3409                                         xw.cw - 1, 1);
3410                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3411                                         borderpx + curx * xw.cw,
3412                                         borderpx + term.c.y * xw.ch,
3413                                         1, xw.ch - 1);
3414                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3415                                         borderpx + (curx + 1) * xw.cw - 1,
3416                                         borderpx + term.c.y * xw.ch,
3417                                         1, xw.ch - 1);
3418                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3419                                         borderpx + curx * xw.cw,
3420                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3421                                         xw.cw, 1);
3422                 }
3423                 oldx = curx, oldy = term.c.y;
3424         }
3425 }
3426
3427
3428 void
3429 xsettitle(char *p) {
3430         XTextProperty prop;
3431
3432         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3433                         &prop);
3434         XSetWMName(xw.dpy, xw.win, &prop);
3435         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3436         XFree(prop.value);
3437 }
3438
3439 void
3440 xresettitle(void) {
3441         xsettitle(opt_title ? opt_title : "st");
3442 }
3443
3444 void
3445 redraw(int timeout) {
3446         struct timespec tv = {0, timeout * 1000};
3447
3448         tfulldirt();
3449         draw();
3450
3451         if(timeout > 0) {
3452                 nanosleep(&tv, NULL);
3453                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3454         }
3455 }
3456
3457 void
3458 draw(void) {
3459         drawregion(0, 0, term.col, term.row);
3460         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3461                         xw.h, 0, 0);
3462         XSetForeground(xw.dpy, dc.gc,
3463                         dc.col[IS_SET(MODE_REVERSE)?
3464                                 defaultfg : defaultbg].pixel);
3465 }
3466
3467 void
3468 drawregion(int x1, int y1, int x2, int y2) {
3469         int ic, ib, x, y, ox, sl;
3470         Glyph base, new;
3471         char buf[DRAW_BUF_SIZ];
3472         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3473         long unicodep;
3474
3475         if(!(xw.state & WIN_VISIBLE))
3476                 return;
3477
3478         for(y = y1; y < y2; y++) {
3479                 if(!term.dirty[y])
3480                         continue;
3481
3482                 xtermclear(0, y, term.col, y);
3483                 term.dirty[y] = 0;
3484                 base = term.line[y][0];
3485                 ic = ib = ox = 0;
3486                 for(x = x1; x < x2; x++) {
3487                         new = term.line[y][x];
3488                         if(new.mode == ATTR_WDUMMY)
3489                                 continue;
3490                         if(ena_sel && selected(x, y))
3491                                 new.mode ^= ATTR_REVERSE;
3492                         if(ib > 0 && (ATTRCMP(base, new)
3493                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3494                                 xdraws(buf, base, ox, y, ic, ib);
3495                                 ic = ib = 0;
3496                         }
3497                         if(ib == 0) {
3498                                 ox = x;
3499                                 base = new;
3500                         }
3501
3502                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3503                         memcpy(buf+ib, new.c, sl);
3504                         ib += sl;
3505                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3506                 }
3507                 if(ib > 0)
3508                         xdraws(buf, base, ox, y, ic, ib);
3509         }
3510         xdrawcursor();
3511 }
3512
3513 void
3514 expose(XEvent *ev) {
3515         XExposeEvent *e = &ev->xexpose;
3516
3517         if(xw.state & WIN_REDRAW) {
3518                 if(!e->count)
3519                         xw.state &= ~WIN_REDRAW;
3520         }
3521         redraw(0);
3522 }
3523
3524 void
3525 visibility(XEvent *ev) {
3526         XVisibilityEvent *e = &ev->xvisibility;
3527
3528         if(e->state == VisibilityFullyObscured) {
3529                 xw.state &= ~WIN_VISIBLE;
3530         } else if(!(xw.state & WIN_VISIBLE)) {
3531                 /* need a full redraw for next Expose, not just a buf copy */
3532                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3533         }
3534 }
3535
3536 void
3537 unmap(XEvent *ev) {
3538         xw.state &= ~WIN_VISIBLE;
3539 }
3540
3541 void
3542 xsetpointermotion(int set) {
3543         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3544         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3545 }
3546
3547 void
3548 xseturgency(int add) {
3549         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3550
3551         MODBIT(h->flags, add, XUrgencyHint);
3552         XSetWMHints(xw.dpy, xw.win, h);
3553         XFree(h);
3554 }
3555
3556 void
3557 focus(XEvent *ev) {
3558         XFocusChangeEvent *e = &ev->xfocus;
3559
3560         if(e->mode == NotifyGrab)
3561                 return;
3562
3563         if(ev->type == FocusIn) {
3564                 XSetICFocus(xw.xic);
3565                 xw.state |= WIN_FOCUSED;
3566                 xseturgency(0);
3567                 if(IS_SET(MODE_FOCUS))
3568                         ttywrite("\033[I", 3);
3569         } else {
3570                 XUnsetICFocus(xw.xic);
3571                 xw.state &= ~WIN_FOCUSED;
3572                 if(IS_SET(MODE_FOCUS))
3573                         ttywrite("\033[O", 3);
3574         }
3575 }
3576
3577 static inline bool
3578 match(uint mask, uint state) {
3579         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3580 }
3581
3582 void
3583 numlock(const Arg *dummy) {
3584         term.numlock ^= 1;
3585 }
3586
3587 char*
3588 kmap(KeySym k, uint state) {
3589         Key *kp;
3590         int i;
3591
3592         /* Check for mapped keys out of X11 function keys. */
3593         for(i = 0; i < LEN(mappedkeys); i++) {
3594                 if(mappedkeys[i] == k)
3595                         break;
3596         }
3597         if(i == LEN(mappedkeys)) {
3598                 if((k & 0xFFFF) < 0xFD00)
3599                         return NULL;
3600         }
3601
3602         for(kp = key; kp < key + LEN(key); kp++) {
3603                 if(kp->k != k)
3604                         continue;
3605
3606                 if(!match(kp->mask, state))
3607                         continue;
3608
3609                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3610                         continue;
3611                 if(term.numlock && kp->appkey == 2)
3612                         continue;
3613
3614                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3615                         continue;
3616
3617                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3618                         continue;
3619
3620                 return kp->s;
3621         }
3622
3623         return NULL;
3624 }
3625
3626 void
3627 kpress(XEvent *ev) {
3628         XKeyEvent *e = &ev->xkey;
3629         KeySym ksym;
3630         char buf[32], *customkey;
3631         int len;
3632         long c;
3633         Status status;
3634         Shortcut *bp;
3635
3636         if(IS_SET(MODE_KBDLOCK))
3637                 return;
3638
3639         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3640         /* 1. shortcuts */
3641         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3642                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3643                         bp->func(&(bp->arg));
3644                         return;
3645                 }
3646         }
3647
3648         /* 2. custom keys from config.h */
3649         if((customkey = kmap(ksym, e->state))) {
3650                 ttysend(customkey, strlen(customkey));
3651                 return;
3652         }
3653
3654         /* 3. composed string from input method */
3655         if(len == 0)
3656                 return;
3657         if(len == 1 && e->state & Mod1Mask) {
3658                 if(IS_SET(MODE_8BIT)) {
3659                         if(*buf < 0177) {
3660                                 c = *buf | 0x80;
3661                                 len = utf8encode(c, buf, UTF_SIZ);
3662                         }
3663                 } else {
3664                         buf[1] = buf[0];
3665                         buf[0] = '\033';
3666                         len = 2;
3667                 }
3668         }
3669         ttysend(buf, len);
3670 }
3671
3672
3673 void
3674 cmessage(XEvent *e) {
3675         /*
3676          * See xembed specs
3677          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3678          */
3679         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3680                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3681                         xw.state |= WIN_FOCUSED;
3682                         xseturgency(0);
3683                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3684                         xw.state &= ~WIN_FOCUSED;
3685                 }
3686         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3687                 /* Send SIGHUP to shell */
3688                 kill(pid, SIGHUP);
3689                 exit(EXIT_SUCCESS);
3690         }
3691 }
3692
3693 void
3694 cresize(int width, int height) {
3695         int col, row;
3696
3697         if(width != 0)
3698                 xw.w = width;
3699         if(height != 0)
3700                 xw.h = height;
3701
3702         col = (xw.w - 2 * borderpx) / xw.cw;
3703         row = (xw.h - 2 * borderpx) / xw.ch;
3704
3705         tresize(col, row);
3706         xresize(col, row);
3707         ttyresize();
3708 }
3709
3710 void
3711 resize(XEvent *e) {
3712         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3713                 return;
3714
3715         cresize(e->xconfigure.width, e->xconfigure.height);
3716 }
3717
3718 void
3719 run(void) {
3720         XEvent ev;
3721         int w = xw.w, h = xw.h;
3722         fd_set rfd;
3723         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3724         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3725
3726         /* Waiting for window mapping */
3727         while(1) {
3728                 XNextEvent(xw.dpy, &ev);
3729                 if(ev.type == ConfigureNotify) {
3730                         w = ev.xconfigure.width;
3731                         h = ev.xconfigure.height;
3732                 } else if(ev.type == MapNotify) {
3733                         break;
3734                 }
3735         }
3736
3737         ttynew();
3738         cresize(w, h);
3739
3740         gettimeofday(&last, NULL);
3741         lastblink = last;
3742
3743         for(xev = actionfps;;) {
3744                 long deltatime;
3745
3746                 FD_ZERO(&rfd);
3747                 FD_SET(cmdfd, &rfd);
3748                 FD_SET(xfd, &rfd);
3749
3750                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3751                         if(errno == EINTR)
3752                                 continue;
3753                         die("select failed: %s\n", strerror(errno));
3754                 }
3755                 if(FD_ISSET(cmdfd, &rfd)) {
3756                         ttyread();
3757                         if(blinktimeout) {
3758                                 blinkset = tattrset(ATTR_BLINK);
3759                                 if(!blinkset)
3760                                         MODBIT(term.mode, 0, MODE_BLINK);
3761                         }
3762                 }
3763
3764                 if(FD_ISSET(xfd, &rfd))
3765                         xev = actionfps;
3766
3767                 gettimeofday(&now, NULL);
3768                 drawtimeout.tv_sec = 0;
3769                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3770                 tv = &drawtimeout;
3771
3772                 dodraw = 0;
3773                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3774                         tsetdirtattr(ATTR_BLINK);
3775                         term.mode ^= MODE_BLINK;
3776                         lastblink = now;
3777                         dodraw = 1;
3778                 }
3779                 deltatime = TIMEDIFF(now, last);
3780                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3781                                 || deltatime < 0) {
3782                         dodraw = 1;
3783                         last = now;
3784                 }
3785
3786                 if(dodraw) {
3787                         while(XPending(xw.dpy)) {
3788                                 XNextEvent(xw.dpy, &ev);
3789                                 if(XFilterEvent(&ev, None))
3790                                         continue;
3791                                 if(handler[ev.type])
3792                                         (handler[ev.type])(&ev);
3793                         }
3794
3795                         draw();
3796                         XFlush(xw.dpy);
3797
3798                         if(xev && !FD_ISSET(xfd, &rfd))
3799                                 xev--;
3800                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3801                                 if(blinkset) {
3802                                         if(TIMEDIFF(now, lastblink) \
3803                                                         > blinktimeout) {
3804                                                 drawtimeout.tv_usec = 1;
3805                                         } else {
3806                                                 drawtimeout.tv_usec = (1000 * \
3807                                                         (blinktimeout - \
3808                                                         TIMEDIFF(now,
3809                                                                 lastblink)));
3810                                         }
3811                                 } else {
3812                                         tv = NULL;
3813                                 }
3814                         }
3815                 }
3816         }
3817 }
3818
3819 void
3820 usage(void) {
3821         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3822         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3823         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3824 }
3825
3826 int
3827 main(int argc, char *argv[]) {
3828         char *titles;
3829         uint cols = 80, rows = 24;
3830
3831         xw.l = xw.t = 0;
3832         xw.isfixed = False;
3833
3834         ARGBEGIN {
3835         case 'a':
3836                 allowaltscreen = false;
3837                 break;
3838         case 'c':
3839                 opt_class = EARGF(usage());
3840                 break;
3841         case 'e':
3842                 /* eat all remaining arguments */
3843                 if(argc > 1) {
3844                         opt_cmd = &argv[1];
3845                         if(argv[1] != NULL && opt_title == NULL) {
3846                                 titles = xstrdup(argv[1]);
3847                                 opt_title = basename(titles);
3848                         }
3849                 }
3850                 goto run;
3851         case 'f':
3852                 opt_font = EARGF(usage());
3853                 break;
3854         case 'g':
3855                 xw.gm = XParseGeometry(EARGF(usage()),
3856                                 &xw.l, &xw.t, &cols, &rows);
3857                 break;
3858         case 'i':
3859                 xw.isfixed = True;
3860                 break;
3861         case 'o':
3862                 opt_io = EARGF(usage());
3863                 break;
3864         case 't':
3865                 opt_title = EARGF(usage());
3866                 break;
3867         case 'w':
3868                 opt_embed = EARGF(usage());
3869                 break;
3870         case 'v':
3871         default:
3872                 usage();
3873         } ARGEND;
3874
3875 run:
3876         setlocale(LC_CTYPE, "");
3877         XSetLocaleModifiers("");
3878         tnew(cols? cols : 1, rows? rows : 1);
3879         xinit();
3880         selinit();
3881         run();
3882
3883         return 0;
3884 }
3885