st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  80 #define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
  81 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  82
  83 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  84 #define IS_TRUECOL(x)    (1 << 24 & (x))
  85 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  86 #define TRUEGREEN(x)     (((x) & 0xff00))
  87 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  88
  89
  90 #define VT102ID "\033[?6c"
  91
  92 enum glyph_attribute {
  93         ATTR_NULL      = 0,
  94         ATTR_REVERSE   = 1,
  95         ATTR_UNDERLINE = 2,
  96         ATTR_BOLD      = 4,
  97         ATTR_ITALIC    = 8,
  98         ATTR_BLINK     = 16,
  99         ATTR_WRAP      = 32,
 100         ATTR_WIDE      = 64,
 101         ATTR_WDUMMY    = 128,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1,
 117         MODE_INSERT      = 2,
 118         MODE_APPKEYPAD   = 4,
 119         MODE_ALTSCREEN   = 8,
 120         MODE_CRLF        = 16,
 121         MODE_MOUSEBTN    = 32,
 122         MODE_MOUSEMOTION = 64,
 123         MODE_REVERSE     = 128,
 124         MODE_KBDLOCK     = 256,
 125         MODE_HIDE        = 512,
 126         MODE_ECHO        = 1024,
 127         MODE_APPCURSOR   = 2048,
 128         MODE_MOUSESGR    = 4096,
 129         MODE_8BIT        = 8192,
 130         MODE_BLINK       = 16384,
 131         MODE_FBLINK      = 32768,
 132         MODE_FOCUS       = 65536,
 133         MODE_MOUSEX10    = 131072,
 134         MODE_MOUSEMANY   = 262144,
 135         MODE_BRCKTPASTE  = 524288,
 136         MODE_PRINT       = 1048576,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Colour;
 183 typedef Colormap Colourmap;
 184
 185 typedef struct {
 186         char c[UTF_SIZ]; /* character code */
 187         ushort mode;      /* attribute flags */
 188         uint32_t fg;      /* foreground  */
 189         uint32_t bg;      /* background  */
 190 } Glyph;
 191
 192 typedef Glyph *Line;
 193
 194 typedef struct {
 195         Glyph attr; /* current char attributes */
 196         int x;
 197         int y;
 198         char state;
 199 } TCursor;
 200
 201 /* CSI Escape sequence structs */
 202 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 203 typedef struct {
 204         char buf[ESC_BUF_SIZ]; /* raw string */
 205         int len;               /* raw string length */
 206         char priv;
 207         int arg[ESC_ARG_SIZ];
 208         int narg;              /* nb of args */
 209         char mode;
 210 } CSIEscape;
 211
 212 /* STR Escape sequence structs */
 213 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 214 typedef struct {
 215         char type;             /* ESC type ... */
 216         char buf[STR_BUF_SIZ]; /* raw string */
 217         int len;               /* raw string length */
 218         char *args[STR_ARG_SIZ];
 219         int narg;              /* nb of args */
 220 } STREscape;
 221
 222 /* Internal representation of the screen */
 223 typedef struct {
 224         int row;      /* nb row */
 225         int col;      /* nb col */
 226         Line *line;   /* screen */
 227         Line *alt;    /* alternate screen */
 228         bool *dirty;  /* dirtyness of lines */
 229         TCursor c;    /* cursor */
 230         int top;      /* top    scroll limit */
 231         int bot;      /* bottom scroll limit */
 232         int mode;     /* terminal mode flags */
 233         int esc;      /* escape state flags */
 234         char trantbl[4]; /* charset table translation */
 235         int charset;  /* current charset */
 236         int icharset; /* selected charset for sequence */
 237         bool numlock; /* lock numbers in keyboard */
 238         bool *tabs;
 239 } Term;
 240
 241 /* Purely graphic info */
 242 typedef struct {
 243         Display *dpy;
 244         Colourmap cmap;
 245         Window win;
 246         Drawable buf;
 247         Atom xembed, wmdeletewin, netwmname, netwmpid;
 248         XIM xim;
 249         XIC xic;
 250         Draw draw;
 251         Visual *vis;
 252         XSetWindowAttributes attrs;
 253         int scr;
 254         bool isfixed; /* is fixed geometry? */
 255         int l, t; /* left and top offset */
 256         int gm; /* geometry mask */
 257         int tw, th; /* tty width and height */
 258         int w, h; /* window width and height */
 259         int ch; /* char height */
 260         int cw; /* char width  */
 261         char state; /* focus, redraw, visible */
 262 } XWindow;
 263
 264 typedef struct {
 265         uint b;
 266         uint mask;
 267         char *s;
 268 } Mousekey;
 269
 270 typedef struct {
 271         KeySym k;
 272         uint mask;
 273         char *s;
 274         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 275         signed char appkey;    /* application keypad */
 276         signed char appcursor; /* application cursor */
 277         signed char crlf;      /* crlf mode          */
 278 } Key;
 279
 280 typedef struct {
 281         int mode;
 282         int type;
 283         int snap;
 284         /*
 285          * Selection variables:
 286          * nb – normalized coordinates of the beginning of the selection
 287          * ne – normalized coordinates of the end of the selection
 288          * ob – original coordinates of the beginning of the selection
 289          * oe – original coordinates of the end of the selection
 290          */
 291         struct {
 292                 int x, y;
 293         } nb, ne, ob, oe;
 294
 295         char *clip;
 296         Atom xtarget;
 297         bool alt;
 298         struct timeval tclick1;
 299         struct timeval tclick2;
 300 } Selection;
 301
 302 typedef union {
 303         int i;
 304         uint ui;
 305         float f;
 306         const void *v;
 307 } Arg;
 308
 309 typedef struct {
 310         uint mod;
 311         KeySym keysym;
 312         void (*func)(const Arg *);
 313         const Arg arg;
 314 } Shortcut;
 315
 316 /* function definitions used in config.h */
 317 static void clippaste(const Arg *);
 318 static void numlock(const Arg *);
 319 static void selpaste(const Arg *);
 320 static void xzoom(const Arg *);
 321 static void printsel(const Arg *);
 322 static void printscreen(const Arg *) ;
 323 static void toggleprinter(const Arg *);
 324
 325 /* Config.h for applying patches and the configuration. */
 326 #include "config.h"
 327
 328 /* Font structure */
 329 typedef struct {
 330         int height;
 331         int width;
 332         int ascent;
 333         int descent;
 334         short lbearing;
 335         short rbearing;
 336         XftFont *match;
 337         FcFontSet *set;
 338         FcPattern *pattern;
 339 } Font;
 340
 341 /* Drawing Context */
 342 typedef struct {
 343         Colour col[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 selsort(void);
 445 static inline bool selected(int, int);
 446 static char *getsel(void);
 447 static void selcopy(void);
 448 static void selscroll(int, int);
 449 static void selsnap(int, int *, int *, int);
 450 static void getbuttoninfo(XEvent *);
 451 static void mousereport(XEvent *);
 452
 453 static size_t utf8decode(char *, long *, size_t);
 454 static long utf8decodebyte(char, size_t *);
 455 static size_t utf8encode(long, char *, size_t);
 456 static char utf8encodebyte(long, size_t);
 457 static size_t utf8len(char *);
 458 static size_t utf8validate(long *, size_t);
 459
 460 static ssize_t xwrite(int, const char *, size_t);
 461 static void *xmalloc(size_t);
 462 static void *xrealloc(void *, size_t);
 463 static char *xstrdup(char *);
 464
 465 static void usage(void);
 466
 467 static void (*handler[LASTEvent])(XEvent *) = {
 468         [KeyPress] = kpress,
 469         [ClientMessage] = cmessage,
 470         [ConfigureNotify] = resize,
 471         [VisibilityNotify] = visibility,
 472         [UnmapNotify] = unmap,
 473         [Expose] = expose,
 474         [FocusIn] = focus,
 475         [FocusOut] = focus,
 476         [MotionNotify] = bmotion,
 477         [ButtonPress] = bpress,
 478         [ButtonRelease] = brelease,
 479         [SelectionClear] = selclear,
 480         [SelectionNotify] = selnotify,
 481         [SelectionRequest] = selrequest,
 482 };
 483
 484 /* Globals */
 485 static DC dc;
 486 static XWindow xw;
 487 static Term term;
 488 static CSIEscape csiescseq;
 489 static STREscape strescseq;
 490 static int cmdfd;
 491 static pid_t pid;
 492 static Selection sel;
 493 static int iofd = STDOUT_FILENO;
 494 static char **opt_cmd = NULL;
 495 static char *opt_io = NULL;
 496 static char *opt_title = NULL;
 497 static char *opt_embed = NULL;
 498 static char *opt_class = NULL;
 499 static char *opt_font = NULL;
 500 static int oldbutton = 3; /* button event on startup: 3 = release */
 501
 502 static char *usedfont = NULL;
 503 static double usedfontsize = 0;
 504
 505 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 506 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 507 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 508 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 509
 510 /* Font Ring Cache */
 511 enum {
 512         FRC_NORMAL,
 513         FRC_ITALIC,
 514         FRC_BOLD,
 515         FRC_ITALICBOLD
 516 };
 517
 518 typedef struct {
 519         XftFont *font;
 520         int flags;
 521 } Fontcache;
 522
 523 /* Fontcache is an array now. A new font will be appended to the array. */
 524 static Fontcache frc[16];
 525 static int frclen = 0;
 526
 527 ssize_t
 528 xwrite(int fd, const char *s, size_t len) {
 529         size_t aux = len;
 530
 531         while(len > 0) {
 532                 ssize_t r = write(fd, s, len);
 533                 if(r < 0)
 534                         return r;
 535                 len -= r;
 536                 s += r;
 537         }
 538         return aux;
 539 }
 540
 541 void *
 542 xmalloc(size_t len) {
 543         void *p = malloc(len);
 544
 545         if(!p)
 546                 die("Out of memory\n");
 547
 548         return p;
 549 }
 550
 551 void *
 552 xrealloc(void *p, size_t len) {
 553         if((p = realloc(p, len)) == NULL)
 554                 die("Out of memory\n");
 555
 556         return p;
 557 }
 558
 559 char *
 560 xstrdup(char *s) {
 561         if((s = strdup(s)) == NULL)
 562                 die("Out of memory\n");
 563
 564         return s;
 565 }
 566
 567 size_t
 568 utf8decode(char *c, long *u, size_t clen) {
 569         size_t i, j, len, type;
 570         long udecoded;
 571
 572         *u = UTF_INVALID;
 573         if(!clen)
 574                 return 0;
 575         udecoded = utf8decodebyte(c[0], &len);
 576         if(!BETWEEN(len, 1, UTF_SIZ))
 577                 return 1;
 578         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 579                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 580                 if(type != 0)
 581                         return j;
 582         }
 583         if(j < len)
 584                 return 0;
 585         *u = udecoded;
 586         utf8validate(u, len);
 587         return len;
 588 }
 589
 590 long
 591 utf8decodebyte(char c, size_t *i) {
 592         for(*i = 0; *i < LEN(utfmask); ++(*i))
 593                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 594                         return (uchar)c & ~utfmask[*i];
 595         return 0;
 596 }
 597
 598 size_t
 599 utf8encode(long u, char *c, size_t clen) {
 600         size_t len, i;
 601
 602         len = utf8validate(&u, 0);
 603         if(clen < len)
 604                 return 0;
 605         for(i = len - 1; i != 0; --i) {
 606                 c[i] = utf8encodebyte(u, 0);
 607                 u >>= 6;
 608         }
 609         c[0] = utf8encodebyte(u, len);
 610         return len;
 611 }
 612
 613 char
 614 utf8encodebyte(long u, size_t i) {
 615         return utfbyte[i] | (u & ~utfmask[i]);
 616 }
 617
 618 size_t
 619 utf8len(char *c) {
 620         return utf8decode(c, &(long){0}, UTF_SIZ);
 621 }
 622
 623 size_t
 624 utf8validate(long *u, size_t i) {
 625         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 626                 *u = UTF_INVALID;
 627         for(i = 1; *u > utfmax[i]; ++i)
 628                 ;
 629         return i;
 630 }
 631
 632 static void
 633 selinit(void) {
 634         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 635         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 636         sel.mode = 0;
 637         sel.ob.x = -1;
 638         sel.clip = NULL;
 639         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 640         if(sel.xtarget == None)
 641                 sel.xtarget = XA_STRING;
 642 }
 643
 644 static int
 645 x2col(int x) {
 646         x -= borderpx;
 647         x /= xw.cw;
 648
 649         return LIMIT(x, 0, term.col-1);
 650 }
 651
 652 static int
 653 y2row(int y) {
 654         y -= borderpx;
 655         y /= xw.ch;
 656
 657         return LIMIT(y, 0, term.row-1);
 658 }
 659
 660 static void
 661 selsort(void) {
 662         if(sel.ob.y == sel.oe.y) {
 663                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 664                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 665         } else {
 666                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 667                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 668         }
 669         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 670         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 671 }
 672
 673 static inline bool
 674 selected(int x, int y) {
 675         if(sel.type == SEL_RECTANGULAR)
 676                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 677                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 678
 679         return BETWEEN(y, sel.nb.y, sel.ne.y)
 680             && (y != sel.nb.y || x >= sel.nb.x)
 681             && (y != sel.ne.y || x <= sel.ne.x);
 682 }
 683
 684 void
 685 selsnap(int mode, int *x, int *y, int direction) {
 686         int i;
 687
 688         switch(mode) {
 689         case SNAP_WORD:
 690                 /*
 691                  * Snap around if the word wraps around at the end or
 692                  * beginning of a line.
 693                  */
 694                 for(;;) {
 695                         if(direction < 0 && *x <= 0) {
 696                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 697                                                 & ATTR_WRAP) {
 698                                         *y -= 1;
 699                                         *x = term.col-1;
 700                                 } else {
 701                                         break;
 702                                 }
 703                         }
 704                         if(direction > 0 && *x >= term.col-1) {
 705                                 if(*y < term.row-1 && term.line[*y][*x].mode
 706                                                 & ATTR_WRAP) {
 707                                         *y += 1;
 708                                         *x = 0;
 709                                 } else {
 710                                         break;
 711                                 }
 712                         }
 713
 714                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 715                                 *x += direction;
 716                                 continue;
 717                         }
 718
 719                         if(strchr(worddelimiters,
 720                                         term.line[*y][*x+direction].c[0])) {
 721                                 break;
 722                         }
 723
 724                         *x += direction;
 725                 }
 726                 break;
 727         case SNAP_LINE:
 728                 /*
 729                  * Snap around if the the previous line or the current one
 730                  * has set ATTR_WRAP at its end. Then the whole next or
 731                  * previous line will be selected.
 732                  */
 733                 *x = (direction < 0) ? 0 : term.col - 1;
 734                 if(direction < 0 && *y > 0) {
 735                         for(; *y > 0; *y += direction) {
 736                                 if(!(term.line[*y-1][term.col-1].mode
 737                                                 & ATTR_WRAP)) {
 738                                         break;
 739                                 }
 740                         }
 741                 } else if(direction > 0 && *y < term.row-1) {
 742                         for(; *y < term.row; *y += direction) {
 743                                 if(!(term.line[*y][term.col-1].mode
 744                                                 & ATTR_WRAP)) {
 745                                         break;
 746                                 }
 747                         }
 748                 }
 749                 break;
 750         default:
 751                 /*
 752                  * Select the whole line when the end of line is reached.
 753                  */
 754                 if(direction > 0) {
 755                         i = term.col;
 756                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 757                                 /* nothing */;
 758                         if(i > 0 && i < *x)
 759                                 *x = term.col - 1;
 760                 }
 761                 break;
 762         }
 763 }
 764
 765 void
 766 getbuttoninfo(XEvent *e) {
 767         int type;
 768         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 769
 770         sel.alt = IS_SET(MODE_ALTSCREEN);
 771
 772         sel.oe.x = x2col(e->xbutton.x);
 773         sel.oe.y = y2row(e->xbutton.y);
 774
 775         if(sel.ob.y < sel.oe.y
 776                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 777                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 778                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 779         } else {
 780                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 781                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 782         }
 783         selsort();
 784
 785         sel.type = SEL_REGULAR;
 786         for(type = 1; type < LEN(selmasks); ++type) {
 787                 if(match(selmasks[type], state)) {
 788                         sel.type = type;
 789                         break;
 790                 }
 791         }
 792 }
 793
 794 void
 795 mousereport(XEvent *e) {
 796         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 797             button = e->xbutton.button, state = e->xbutton.state,
 798             len;
 799         char buf[40];
 800         static int ox, oy;
 801
 802         /* from urxvt */
 803         if(e->xbutton.type == MotionNotify) {
 804                 if(x == ox && y == oy)
 805                         return;
 806                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 807                         return;
 808                 /* MOUSE_MOTION: no reporting if no button is pressed */
 809                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 810                         return;
 811
 812                 button = oldbutton + 32;
 813                 ox = x;
 814                 oy = y;
 815         } else {
 816                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 817                         button = 3;
 818                 } else {
 819                         button -= Button1;
 820                         if(button >= 3)
 821                                 button += 64 - 3;
 822                 }
 823                 if(e->xbutton.type == ButtonPress) {
 824                         oldbutton = button;
 825                         ox = x;
 826                         oy = y;
 827                 } else if(e->xbutton.type == ButtonRelease) {
 828                         oldbutton = 3;
 829                         /* MODE_MOUSEX10: no button release reporting */
 830                         if(IS_SET(MODE_MOUSEX10))
 831                                 return;
 832                         if (button == 64 || button == 65)
 833                                 return;
 834                 }
 835         }
 836
 837         if(!IS_SET(MODE_MOUSEX10)) {
 838                 button += (state & ShiftMask   ? 4  : 0)
 839                         + (state & Mod4Mask    ? 8  : 0)
 840                         + (state & ControlMask ? 16 : 0);
 841         }
 842
 843         len = 0;
 844         if(IS_SET(MODE_MOUSESGR)) {
 845                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 846                                 button, x+1, y+1,
 847                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 848         } else if(x < 223 && y < 223) {
 849                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 850                                 32+button, 32+x+1, 32+y+1);
 851         } else {
 852                 return;
 853         }
 854
 855         ttywrite(buf, len);
 856 }
 857
 858 void
 859 bpress(XEvent *e) {
 860         struct timeval now;
 861         Mousekey *mk;
 862
 863         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 864                 mousereport(e);
 865                 return;
 866         }
 867
 868         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 869                 if(e->xbutton.button == mk->b
 870                                 && match(mk->mask, e->xbutton.state)) {
 871                         ttysend(mk->s, strlen(mk->s));
 872                         return;
 873                 }
 874         }
 875
 876         if(e->xbutton.button == Button1) {
 877                 gettimeofday(&now, NULL);
 878
 879                 /* Clear previous selection, logically and visually. */
 880                 selclear(NULL);
 881                 sel.mode = 1;
 882                 sel.type = SEL_REGULAR;
 883                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 884                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 885
 886                 /*
 887                  * If the user clicks below predefined timeouts specific
 888                  * snapping behaviour is exposed.
 889                  */
 890                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 891                         sel.snap = SNAP_LINE;
 892                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 893                         sel.snap = SNAP_WORD;
 894                 } else {
 895                         sel.snap = 0;
 896                 }
 897                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 898                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 899                 selsort();
 900
 901                 /*
 902                  * Draw selection, unless it's regular and we don't want to
 903                  * make clicks visible
 904                  */
 905                 if(sel.snap != 0) {
 906                         sel.mode++;
 907                         tsetdirt(sel.nb.y, sel.ne.y);
 908                 }
 909                 sel.tclick2 = sel.tclick1;
 910                 sel.tclick1 = now;
 911         }
 912 }
 913
 914 char *
 915 getsel(void) {
 916         char *str, *ptr;
 917         int x, y, bufsize, size, i, ex;
 918         Glyph *gp, *last;
 919
 920         if(sel.ob.x == -1)
 921                 return NULL;
 922
 923         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 924         ptr = str = xmalloc(bufsize);
 925
 926         /* append every set & selected glyph to the selection */
 927         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 928                 gp = &term.line[y][0];
 929                 last = &gp[term.col-1];
 930
 931                 while(last >= gp && !(selected(last - gp, y) &&
 932                                       strcmp(last->c, " ") != 0)) {
 933                         --last;
 934                 }
 935
 936                 for(x = 0; gp <= last; x++, ++gp) {
 937                         if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 938                                 continue;
 939
 940                         size = utf8len(gp->c);
 941                         memcpy(ptr, gp->c, size);
 942                         ptr += size;
 943                 }
 944
 945                 /*
 946                  * Copy and pasting of line endings is inconsistent
 947                  * in the inconsistent terminal and GUI world.
 948                  * The best solution seems like to produce '\n' when
 949                  * something is copied from st and convert '\n' to
 950                  * '\r', when something to be pasted is received by
 951                  * st.
 952                  * FIXME: Fix the computer world.
 953                  */
 954                 if(y < sel.ne.y && !(x > 0 && (gp-1)->mode & ATTR_WRAP))
 955                         *ptr++ = '\n';
 956
 957                 /*
 958                  * If the last selected line expands in the selection
 959                  * after the visible text '\n' is appended.
 960                  */
 961                 if(y == sel.ne.y) {
 962                         i = term.col;
 963                         while(--i > 0 && term.line[y][i].c[0] == ' ')
 964                                 /* nothing */;
 965                         ex = sel.ne.x;
 966                         if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 967                                 ex = sel.nb.x;
 968                         if(i < ex)
 969                                 *ptr++ = '\n';
 970                 }
 971         }
 972         *ptr = 0;
 973         return str;
 974 }
 975
 976 void
 977 selcopy(void) {
 978         xsetsel(getsel());
 979 }
 980
 981 void
 982 selnotify(XEvent *e) {
 983         ulong nitems, ofs, rem;
 984         int format;
 985         uchar *data, *last, *repl;
 986         Atom type;
 987
 988         ofs = 0;
 989         do {
 990                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 991                                         False, AnyPropertyType, &type, &format,
 992                                         &nitems, &rem, &data)) {
 993                         fprintf(stderr, "Clipboard allocation failed\n");
 994                         return;
 995                 }
 996
 997                 /*
 998                  * As seen in getsel:
 999                  * Line endings are inconsistent in the terminal and GUI world
1000                  * copy and pasting. When receiving some selection data,
1001                  * replace all '\n' with '\r'.
1002                  * FIXME: Fix the computer world.
1003                  */
1004                 repl = data;
1005                 last = data + nitems * format / 8;
1006                 while((repl = memchr(repl, '\n', last - repl))) {
1007                         *repl++ = '\r';
1008                 }
1009
1010                 if(IS_SET(MODE_BRCKTPASTE))
1011                         ttywrite("\033[200~", 6);
1012                 ttysend((char *)data, nitems * format / 8);
1013                 if(IS_SET(MODE_BRCKTPASTE))
1014                         ttywrite("\033[201~", 6);
1015                 XFree(data);
1016                 /* number of 32-bit chunks returned */
1017                 ofs += nitems * format / 32;
1018         } while(rem > 0);
1019 }
1020
1021 void
1022 selpaste(const Arg *dummy) {
1023         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1024                         xw.win, CurrentTime);
1025 }
1026
1027 void
1028 clippaste(const Arg *dummy) {
1029         Atom clipboard;
1030
1031         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1032         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1033                         xw.win, CurrentTime);
1034 }
1035
1036 void
1037 selclear(XEvent *e) {
1038         if(sel.ob.x == -1)
1039                 return;
1040         sel.ob.x = -1;
1041         tsetdirt(sel.nb.y, sel.ne.y);
1042 }
1043
1044 void
1045 selrequest(XEvent *e) {
1046         XSelectionRequestEvent *xsre;
1047         XSelectionEvent xev;
1048         Atom xa_targets, string;
1049
1050         xsre = (XSelectionRequestEvent *) e;
1051         xev.type = SelectionNotify;
1052         xev.requestor = xsre->requestor;
1053         xev.selection = xsre->selection;
1054         xev.target = xsre->target;
1055         xev.time = xsre->time;
1056         /* reject */
1057         xev.property = None;
1058
1059         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1060         if(xsre->target == xa_targets) {
1061                 /* respond with the supported type */
1062                 string = sel.xtarget;
1063                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1064                                 XA_ATOM, 32, PropModeReplace,
1065                                 (uchar *) &string, 1);
1066                 xev.property = xsre->property;
1067         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1068                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1069                                 xsre->target, 8, PropModeReplace,
1070                                 (uchar *) sel.clip, strlen(sel.clip));
1071                 xev.property = xsre->property;
1072         }
1073
1074         /* all done, send a notification to the listener */
1075         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1076                 fprintf(stderr, "Error sending SelectionNotify event\n");
1077 }
1078
1079 void
1080 xsetsel(char *str) {
1081         /* register the selection for both the clipboard and the primary */
1082         Atom clipboard;
1083
1084         free(sel.clip);
1085         sel.clip = str;
1086
1087         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1088
1089         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1090         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1091 }
1092
1093 void
1094 brelease(XEvent *e) {
1095         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1096                 mousereport(e);
1097                 return;
1098         }
1099
1100         if(e->xbutton.button == Button2) {
1101                 selpaste(NULL);
1102         } else if(e->xbutton.button == Button1) {
1103                 if(sel.mode < 2) {
1104                         selclear(NULL);
1105                 } else {
1106                         getbuttoninfo(e);
1107                         selcopy();
1108                 }
1109                 sel.mode = 0;
1110                 tsetdirt(sel.nb.y, sel.ne.y);
1111         }
1112 }
1113
1114 void
1115 bmotion(XEvent *e) {
1116         int oldey, oldex, oldsby, oldsey;
1117
1118         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1119                 mousereport(e);
1120                 return;
1121         }
1122
1123         if(!sel.mode)
1124                 return;
1125
1126         sel.mode++;
1127         oldey = sel.oe.y;
1128         oldex = sel.oe.x;
1129         oldsby = sel.nb.y;
1130         oldsey = sel.ne.y;
1131         getbuttoninfo(e);
1132
1133         if(oldey != sel.oe.y || oldex != sel.oe.x)
1134                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1135 }
1136
1137 void
1138 die(const char *errstr, ...) {
1139         va_list ap;
1140
1141         va_start(ap, errstr);
1142         vfprintf(stderr, errstr, ap);
1143         va_end(ap);
1144         exit(EXIT_FAILURE);
1145 }
1146
1147 void
1148 execsh(void) {
1149         char **args;
1150         char *envshell = getenv("SHELL");
1151         const struct passwd *pass = getpwuid(getuid());
1152         char buf[sizeof(long) * 8 + 1];
1153
1154         unsetenv("COLUMNS");
1155         unsetenv("LINES");
1156         unsetenv("TERMCAP");
1157
1158         if(pass) {
1159                 setenv("LOGNAME", pass->pw_name, 1);
1160                 setenv("USER", pass->pw_name, 1);
1161                 setenv("SHELL", pass->pw_shell, 0);
1162                 setenv("HOME", pass->pw_dir, 0);
1163         }
1164
1165         snprintf(buf, sizeof(buf), "%lu", xw.win);
1166         setenv("WINDOWID", buf, 1);
1167
1168         signal(SIGCHLD, SIG_DFL);
1169         signal(SIGHUP, SIG_DFL);
1170         signal(SIGINT, SIG_DFL);
1171         signal(SIGQUIT, SIG_DFL);
1172         signal(SIGTERM, SIG_DFL);
1173         signal(SIGALRM, SIG_DFL);
1174
1175         DEFAULT(envshell, shell);
1176         setenv("TERM", termname, 1);
1177         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1178         execvp(args[0], args);
1179         exit(EXIT_FAILURE);
1180 }
1181
1182 void
1183 sigchld(int a) {
1184         int stat = 0;
1185
1186         if(waitpid(pid, &stat, 0) < 0)
1187                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1188
1189         if(WIFEXITED(stat)) {
1190                 exit(WEXITSTATUS(stat));
1191         } else {
1192                 exit(EXIT_FAILURE);
1193         }
1194 }
1195
1196 void
1197 ttynew(void) {
1198         int m, s;
1199         struct winsize w = {term.row, term.col, 0, 0};
1200
1201         /* seems to work fine on linux, openbsd and freebsd */
1202         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1203                 die("openpty failed: %s\n", strerror(errno));
1204
1205         switch(pid = fork()) {
1206         case -1:
1207                 die("fork failed\n");
1208                 break;
1209         case 0:
1210                 setsid(); /* create a new process group */
1211                 dup2(s, STDIN_FILENO);
1212                 dup2(s, STDOUT_FILENO);
1213                 dup2(s, STDERR_FILENO);
1214                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1215                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1216                 close(s);
1217                 close(m);
1218                 execsh();
1219                 break;
1220         default:
1221                 close(s);
1222                 cmdfd = m;
1223                 signal(SIGCHLD, sigchld);
1224                 if(opt_io) {
1225                         term.mode |= MODE_PRINT;
1226                         iofd = (!strcmp(opt_io, "-")) ?
1227                                   STDOUT_FILENO :
1228                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1229                         if(iofd < 0) {
1230                                 fprintf(stderr, "Error opening %s:%s\n",
1231                                         opt_io, strerror(errno));
1232                         }
1233                 }
1234                 break;
1235         }
1236 }
1237
1238 void
1239 ttyread(void) {
1240         static char buf[BUFSIZ];
1241         static int buflen = 0;
1242         char *ptr;
1243         char s[UTF_SIZ];
1244         int charsize; /* size of utf8 char in bytes */
1245         long unicodep;
1246         int ret;
1247
1248         /* append read bytes to unprocessed bytes */
1249         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1250                 die("Couldn't read from shell: %s\n", strerror(errno));
1251
1252         /* process every complete utf8 char */
1253         buflen += ret;
1254         ptr = buf;
1255         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1256                 utf8encode(unicodep, s, UTF_SIZ);
1257                 tputc(s, charsize);
1258                 ptr += charsize;
1259                 buflen -= charsize;
1260         }
1261
1262         /* keep any uncomplete utf8 char for the next call */
1263         memmove(buf, ptr, buflen);
1264 }
1265
1266 void
1267 ttywrite(const char *s, size_t n) {
1268         if(xwrite(cmdfd, s, n) == -1)
1269                 die("write error on tty: %s\n", strerror(errno));
1270 }
1271
1272 void
1273 ttysend(char *s, size_t n) {
1274         ttywrite(s, n);
1275         if(IS_SET(MODE_ECHO))
1276                 techo(s, n);
1277 }
1278
1279 void
1280 ttyresize(void) {
1281         struct winsize w;
1282
1283         w.ws_row = term.row;
1284         w.ws_col = term.col;
1285         w.ws_xpixel = xw.tw;
1286         w.ws_ypixel = xw.th;
1287         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1288                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1289 }
1290
1291 int
1292 tattrset(int attr) {
1293         int i, j;
1294
1295         for(i = 0; i < term.row-1; i++) {
1296                 for(j = 0; j < term.col-1; j++) {
1297                         if(term.line[i][j].mode & attr)
1298                                 return 1;
1299                 }
1300         }
1301
1302         return 0;
1303 }
1304
1305 void
1306 tsetdirt(int top, int bot) {
1307         int i;
1308
1309         LIMIT(top, 0, term.row-1);
1310         LIMIT(bot, 0, term.row-1);
1311
1312         for(i = top; i <= bot; i++)
1313                 term.dirty[i] = 1;
1314 }
1315
1316 void
1317 tsetdirtattr(int attr) {
1318         int i, j;
1319
1320         for(i = 0; i < term.row-1; i++) {
1321                 for(j = 0; j < term.col-1; j++) {
1322                         if(term.line[i][j].mode & attr) {
1323                                 tsetdirt(i, i);
1324                                 break;
1325                         }
1326                 }
1327         }
1328 }
1329
1330 void
1331 tfulldirt(void) {
1332         tsetdirt(0, term.row-1);
1333 }
1334
1335 void
1336 tcursor(int mode) {
1337         static TCursor c[2];
1338         bool alt = IS_SET(MODE_ALTSCREEN);
1339
1340         if(mode == CURSOR_SAVE) {
1341                 c[alt] = term.c;
1342         } else if(mode == CURSOR_LOAD) {
1343                 term.c = c[alt];
1344                 tmoveto(c[alt].x, c[alt].y);
1345         }
1346 }
1347
1348 void
1349 treset(void) {
1350         uint i;
1351
1352         term.c = (TCursor){{
1353                 .mode = ATTR_NULL,
1354                 .fg = defaultfg,
1355                 .bg = defaultbg
1356         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1357
1358         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1359         for(i = tabspaces; i < term.col; i += tabspaces)
1360                 term.tabs[i] = 1;
1361         term.top = 0;
1362         term.bot = term.row - 1;
1363         term.mode = MODE_WRAP;
1364         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1365         term.charset = 0;
1366
1367         tclearregion(0, 0, term.col-1, term.row-1);
1368         tmoveto(0, 0);
1369         tcursor(CURSOR_SAVE);
1370 }
1371
1372 void
1373 tnew(int col, int row) {
1374         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1375         tresize(col, row);
1376         term.numlock = 1;
1377
1378         treset();
1379 }
1380
1381 void
1382 tswapscreen(void) {
1383         Line *tmp = term.line;
1384
1385         term.line = term.alt;
1386         term.alt = tmp;
1387         term.mode ^= MODE_ALTSCREEN;
1388         tfulldirt();
1389 }
1390
1391 void
1392 tscrolldown(int orig, int n) {
1393         int i;
1394         Line temp;
1395
1396         LIMIT(n, 0, term.bot-orig+1);
1397
1398         tsetdirt(orig, term.bot-n);
1399         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1400
1401         for(i = term.bot; i >= orig+n; i--) {
1402                 temp = term.line[i];
1403                 term.line[i] = term.line[i-n];
1404                 term.line[i-n] = temp;
1405         }
1406
1407         selscroll(orig, n);
1408 }
1409
1410 void
1411 tscrollup(int orig, int n) {
1412         int i;
1413         Line temp;
1414
1415         LIMIT(n, 0, term.bot-orig+1);
1416
1417         tclearregion(0, orig, term.col-1, orig+n-1);
1418         tsetdirt(orig+n, term.bot);
1419
1420         for(i = orig; i <= term.bot-n; i++) {
1421                 temp = term.line[i];
1422                 term.line[i] = term.line[i+n];
1423                 term.line[i+n] = temp;
1424         }
1425
1426         selscroll(orig, -n);
1427 }
1428
1429 void
1430 selscroll(int orig, int n) {
1431         if(sel.ob.x == -1)
1432                 return;
1433
1434         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1435                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1436                         selclear(NULL);
1437                         return;
1438                 }
1439                 if(sel.type == SEL_RECTANGULAR) {
1440                         if(sel.ob.y < term.top)
1441                                 sel.ob.y = term.top;
1442                         if(sel.oe.y > term.bot)
1443                                 sel.oe.y = term.bot;
1444                 } else {
1445                         if(sel.ob.y < term.top) {
1446                                 sel.ob.y = term.top;
1447                                 sel.ob.x = 0;
1448                         }
1449                         if(sel.oe.y > term.bot) {
1450                                 sel.oe.y = term.bot;
1451                                 sel.oe.x = term.col;
1452                         }
1453                 }
1454                 selsort();
1455         }
1456 }
1457
1458 void
1459 tnewline(int first_col) {
1460         int y = term.c.y;
1461
1462         if(y == term.bot) {
1463                 tscrollup(term.top, 1);
1464         } else {
1465                 y++;
1466         }
1467         tmoveto(first_col ? 0 : term.c.x, y);
1468 }
1469
1470 void
1471 csiparse(void) {
1472         char *p = csiescseq.buf, *np;
1473         long int v;
1474
1475         csiescseq.narg = 0;
1476         if(*p == '?') {
1477                 csiescseq.priv = 1;
1478                 p++;
1479         }
1480
1481         csiescseq.buf[csiescseq.len] = '\0';
1482         while(p < csiescseq.buf+csiescseq.len) {
1483                 np = NULL;
1484                 v = strtol(p, &np, 10);
1485                 if(np == p)
1486                         v = 0;
1487                 if(v == LONG_MAX || v == LONG_MIN)
1488                         v = -1;
1489                 csiescseq.arg[csiescseq.narg++] = v;
1490                 p = np;
1491                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1492                         break;
1493                 p++;
1494         }
1495         csiescseq.mode = *p;
1496 }
1497
1498 /* for absolute user moves, when decom is set */
1499 void
1500 tmoveato(int x, int y) {
1501         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1502 }
1503
1504 void
1505 tmoveto(int x, int y) {
1506         int miny, maxy;
1507
1508         if(term.c.state & CURSOR_ORIGIN) {
1509                 miny = term.top;
1510                 maxy = term.bot;
1511         } else {
1512                 miny = 0;
1513                 maxy = term.row - 1;
1514         }
1515         LIMIT(x, 0, term.col-1);
1516         LIMIT(y, miny, maxy);
1517         term.c.state &= ~CURSOR_WRAPNEXT;
1518         term.c.x = x;
1519         term.c.y = y;
1520 }
1521
1522 void
1523 tsetchar(char *c, Glyph *attr, int x, int y) {
1524         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1525                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1526                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1527                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1528                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1529                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1530                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1531                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1532                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1533         };
1534
1535         /*
1536          * The table is proudly stolen from rxvt.
1537          */
1538         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1539                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1540                         c = vt100_0[c[0] - 0x41];
1541                 }
1542         }
1543
1544         if(term.line[y][x].mode & ATTR_WIDE) {
1545                 if(x+1 < term.col) {
1546                         term.line[y][x+1].c[0] = ' ';
1547                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1548                 }
1549         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1550                 term.line[y][x-1].c[0] = ' ';
1551                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1552         }
1553
1554         term.dirty[y] = 1;
1555         term.line[y][x] = *attr;
1556         memcpy(term.line[y][x].c, c, UTF_SIZ);
1557 }
1558
1559 void
1560 tclearregion(int x1, int y1, int x2, int y2) {
1561         int x, y, temp;
1562
1563         if(x1 > x2)
1564                 temp = x1, x1 = x2, x2 = temp;
1565         if(y1 > y2)
1566                 temp = y1, y1 = y2, y2 = temp;
1567
1568         LIMIT(x1, 0, term.col-1);
1569         LIMIT(x2, 0, term.col-1);
1570         LIMIT(y1, 0, term.row-1);
1571         LIMIT(y2, 0, term.row-1);
1572
1573         for(y = y1; y <= y2; y++) {
1574                 term.dirty[y] = 1;
1575                 for(x = x1; x <= x2; x++) {
1576                         if(selected(x, y))
1577                                 selclear(NULL);
1578                         term.line[y][x] = term.c.attr;
1579                         memcpy(term.line[y][x].c, " ", 2);
1580                 }
1581         }
1582 }
1583
1584 void
1585 tdeletechar(int n) {
1586         int dst, src, size;
1587         Glyph *line;
1588
1589         LIMIT(n, 0, term.col - term.c.x);
1590
1591         dst = term.c.x;
1592         src = term.c.x + n;
1593         size = term.col - src;
1594         line = term.line[term.c.y];
1595
1596         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1597         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1598 }
1599
1600 void
1601 tinsertblank(int n) {
1602         int dst, src, size;
1603         Glyph *line;
1604
1605         LIMIT(n, 0, term.col - term.c.x);
1606
1607         dst = term.c.x + n;
1608         src = term.c.x;
1609         size = term.col - dst;
1610         line = term.line[term.c.y];
1611
1612         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1613         tclearregion(src, term.c.y, dst - 1, term.c.y);
1614 }
1615
1616 void
1617 tinsertblankline(int n) {
1618         if(BETWEEN(term.c.y, term.top, term.bot))
1619                 tscrolldown(term.c.y, n);
1620 }
1621
1622 void
1623 tdeleteline(int n) {
1624         if(BETWEEN(term.c.y, term.top, term.bot))
1625                 tscrollup(term.c.y, n);
1626 }
1627
1628 int32_t
1629 tdefcolor(int *attr, int *npar, int l) {
1630         int32_t idx = -1;
1631         uint r, g, b;
1632
1633         switch (attr[*npar + 1]) {
1634         case 2: /* direct colour in RGB space */
1635                 if (*npar + 4 >= l) {
1636                         fprintf(stderr,
1637                                 "erresc(38): Incorrect number of parameters (%d)\n",
1638                                 *npar);
1639                         break;
1640                 }
1641                 r = attr[*npar + 2];
1642                 g = attr[*npar + 3];
1643                 b = attr[*npar + 4];
1644                 *npar += 4;
1645                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1646                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1647                                 r, g, b);
1648                 else
1649                         idx = TRUECOLOR(r, g, b);
1650                 break;
1651         case 5: /* indexed colour */
1652                 if (*npar + 2 >= l) {
1653                         fprintf(stderr,
1654                                 "erresc(38): Incorrect number of parameters (%d)\n",
1655                                 *npar);
1656                         break;
1657                 }
1658                 *npar += 2;
1659                 if(!BETWEEN(attr[*npar], 0, 255))
1660                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1661                 else
1662                         idx = attr[*npar];
1663                 break;
1664         case 0: /* implemented defined (only foreground) */
1665         case 1: /* transparent */
1666         case 3: /* direct colour in CMY space */
1667         case 4: /* direct colour in CMYK space */
1668         default:
1669                 fprintf(stderr,
1670                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1671                 break;
1672         }
1673
1674         return idx;
1675 }
1676
1677 void
1678 tsetattr(int *attr, int l) {
1679         int i;
1680         int32_t idx;
1681
1682         for(i = 0; i < l; i++) {
1683                 switch(attr[i]) {
1684                 case 0:
1685                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1686                                         | ATTR_BOLD | ATTR_ITALIC \
1687                                         | ATTR_BLINK);
1688                         term.c.attr.fg = defaultfg;
1689                         term.c.attr.bg = defaultbg;
1690                         break;
1691                 case 1:
1692                         term.c.attr.mode |= ATTR_BOLD;
1693                         break;
1694                 case 3:
1695                         term.c.attr.mode |= ATTR_ITALIC;
1696                         break;
1697                 case 4:
1698                         term.c.attr.mode |= ATTR_UNDERLINE;
1699                         break;
1700                 case 5: /* slow blink */
1701                 case 6: /* rapid blink */
1702                         term.c.attr.mode |= ATTR_BLINK;
1703                         break;
1704                 case 7:
1705                         term.c.attr.mode |= ATTR_REVERSE;
1706                         break;
1707                 case 21:
1708                 case 22:
1709                         term.c.attr.mode &= ~ATTR_BOLD;
1710                         break;
1711                 case 23:
1712                         term.c.attr.mode &= ~ATTR_ITALIC;
1713                         break;
1714                 case 24:
1715                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1716                         break;
1717                 case 25:
1718                 case 26:
1719                         term.c.attr.mode &= ~ATTR_BLINK;
1720                         break;
1721                 case 27:
1722                         term.c.attr.mode &= ~ATTR_REVERSE;
1723                         break;
1724                 case 38:
1725                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1726                                 term.c.attr.fg = idx;
1727                         break;
1728                 case 39:
1729                         term.c.attr.fg = defaultfg;
1730                         break;
1731                 case 48:
1732                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1733                                 term.c.attr.bg = idx;
1734                         break;
1735                 case 49:
1736                         term.c.attr.bg = defaultbg;
1737                         break;
1738                 default:
1739                         if(BETWEEN(attr[i], 30, 37)) {
1740                                 term.c.attr.fg = attr[i] - 30;
1741                         } else if(BETWEEN(attr[i], 40, 47)) {
1742                                 term.c.attr.bg = attr[i] - 40;
1743                         } else if(BETWEEN(attr[i], 90, 97)) {
1744                                 term.c.attr.fg = attr[i] - 90 + 8;
1745                         } else if(BETWEEN(attr[i], 100, 107)) {
1746                                 term.c.attr.bg = attr[i] - 100 + 8;
1747                         } else {
1748                                 fprintf(stderr,
1749                                         "erresc(default): gfx attr %d unknown\n",
1750                                         attr[i]), csidump();
1751                         }
1752                         break;
1753                 }
1754         }
1755 }
1756
1757 void
1758 tsetscroll(int t, int b) {
1759         int temp;
1760
1761         LIMIT(t, 0, term.row-1);
1762         LIMIT(b, 0, term.row-1);
1763         if(t > b) {
1764                 temp = t;
1765                 t = b;
1766                 b = temp;
1767         }
1768         term.top = t;
1769         term.bot = b;
1770 }
1771
1772 void
1773 tsetmode(bool priv, bool set, int *args, int narg) {
1774         int *lim, mode;
1775         bool alt;
1776
1777         for(lim = args + narg; args < lim; ++args) {
1778                 if(priv) {
1779                         switch(*args) {
1780                         case 1: /* DECCKM -- Cursor key */
1781                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1782                                 break;
1783                         case 5: /* DECSCNM -- Reverse video */
1784                                 mode = term.mode;
1785                                 MODBIT(term.mode, set, MODE_REVERSE);
1786                                 if(mode != term.mode)
1787                                         redraw(REDRAW_TIMEOUT);
1788                                 break;
1789                         case 6: /* DECOM -- Origin */
1790                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1791                                 tmoveato(0, 0);
1792                                 break;
1793                         case 7: /* DECAWM -- Auto wrap */
1794                                 MODBIT(term.mode, set, MODE_WRAP);
1795                                 break;
1796                         case 0:  /* Error (IGNORED) */
1797                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1798                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1799                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1800                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1801                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1802                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1803                         case 42: /* DECNRCM -- National characters (IGNORED) */
1804                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1805                                 break;
1806                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1807                                 MODBIT(term.mode, !set, MODE_HIDE);
1808                                 break;
1809                         case 9:    /* X10 mouse compatibility mode */
1810                                 xsetpointermotion(0);
1811                                 MODBIT(term.mode, 0, MODE_MOUSE);
1812                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1813                                 break;
1814                         case 1000: /* 1000: report button press */
1815                                 xsetpointermotion(0);
1816                                 MODBIT(term.mode, 0, MODE_MOUSE);
1817                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1818                                 break;
1819                         case 1002: /* 1002: report motion on button press */
1820                                 xsetpointermotion(0);
1821                                 MODBIT(term.mode, 0, MODE_MOUSE);
1822                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1823                                 break;
1824                         case 1003: /* 1003: enable all mouse motions */
1825                                 xsetpointermotion(set);
1826                                 MODBIT(term.mode, 0, MODE_MOUSE);
1827                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1828                                 break;
1829                         case 1004: /* 1004: send focus events to tty */
1830                                 MODBIT(term.mode, set, MODE_FOCUS);
1831                                 break;
1832                         case 1006: /* 1006: extended reporting mode */
1833                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1834                                 break;
1835                         case 1034:
1836                                 MODBIT(term.mode, set, MODE_8BIT);
1837                                 break;
1838                         case 1049: /* swap screen & set/restore cursor as xterm */
1839                                 if (!allowaltscreen)
1840                                         break;
1841                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1842                                 /* FALLTHROUGH */
1843                         case 47: /* swap screen */
1844                         case 1047:
1845                                 if (!allowaltscreen)
1846                                         break;
1847                                 alt = IS_SET(MODE_ALTSCREEN);
1848                                 if(alt) {
1849                                         tclearregion(0, 0, term.col-1,
1850                                                         term.row-1);
1851                                 }
1852                                 if(set ^ alt) /* set is always 1 or 0 */
1853                                         tswapscreen();
1854                                 if(*args != 1049)
1855                                         break;
1856                                 /* FALLTHROUGH */
1857                         case 1048:
1858                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1859                                 break;
1860                         case 2004: /* 2004: bracketed paste mode */
1861                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1862                                 break;
1863                         /* Not implemented mouse modes. See comments there. */
1864                         case 1001: /* mouse highlight mode; can hang the
1865                                       terminal by design when implemented. */
1866                         case 1005: /* UTF-8 mouse mode; will confuse
1867                                       applications not supporting UTF-8
1868                                       and luit. */
1869                         case 1015: /* urxvt mangled mouse mode; incompatible
1870                                       and can be mistaken for other control
1871                                       codes. */
1872                         default:
1873                                 fprintf(stderr,
1874                                         "erresc: unknown private set/reset mode %d\n",
1875                                         *args);
1876                                 break;
1877                         }
1878                 } else {
1879                         switch(*args) {
1880                         case 0:  /* Error (IGNORED) */
1881                                 break;
1882                         case 2:  /* KAM -- keyboard action */
1883                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1884                                 break;
1885                         case 4:  /* IRM -- Insertion-replacement */
1886                                 MODBIT(term.mode, set, MODE_INSERT);
1887                                 break;
1888                         case 12: /* SRM -- Send/Receive */
1889                                 MODBIT(term.mode, !set, MODE_ECHO);
1890                                 break;
1891                         case 20: /* LNM -- Linefeed/new line */
1892                                 MODBIT(term.mode, set, MODE_CRLF);
1893                                 break;
1894                         default:
1895                                 fprintf(stderr,
1896                                         "erresc: unknown set/reset mode %d\n",
1897                                         *args);
1898                                 break;
1899                         }
1900                 }
1901         }
1902 }
1903
1904 void
1905 csihandle(void) {
1906         char buf[40];
1907         int len;
1908
1909         switch(csiescseq.mode) {
1910         default:
1911         unknown:
1912                 fprintf(stderr, "erresc: unknown csi ");
1913                 csidump();
1914                 /* die(""); */
1915                 break;
1916         case '@': /* ICH -- Insert <n> blank char */
1917                 DEFAULT(csiescseq.arg[0], 1);
1918                 tinsertblank(csiescseq.arg[0]);
1919                 break;
1920         case 'A': /* CUU -- Cursor <n> Up */
1921                 DEFAULT(csiescseq.arg[0], 1);
1922                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1923                 break;
1924         case 'B': /* CUD -- Cursor <n> Down */
1925         case 'e': /* VPR --Cursor <n> Down */
1926                 DEFAULT(csiescseq.arg[0], 1);
1927                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1928                 break;
1929         case 'i': /* MC -- Media Copy */
1930                 switch(csiescseq.arg[0]) {
1931                 case 0:
1932                         tdump();
1933                         break;
1934                 case 1:
1935                         tdumpline(term.c.y);
1936                         break;
1937                 case 2:
1938                         tdumpsel();
1939                         break;
1940                 case 4:
1941                         term.mode &= ~MODE_PRINT;
1942                         break;
1943                 case 5:
1944                         term.mode |= MODE_PRINT;
1945                         break;
1946                 }
1947                 break;
1948         case 'c': /* DA -- Device Attributes */
1949                 if(csiescseq.arg[0] == 0)
1950                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1951                 break;
1952         case 'C': /* CUF -- Cursor <n> Forward */
1953         case 'a': /* HPR -- Cursor <n> Forward */
1954                 DEFAULT(csiescseq.arg[0], 1);
1955                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1956                 break;
1957         case 'D': /* CUB -- Cursor <n> Backward */
1958                 DEFAULT(csiescseq.arg[0], 1);
1959                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1960                 break;
1961         case 'E': /* CNL -- Cursor <n> Down and first col */
1962                 DEFAULT(csiescseq.arg[0], 1);
1963                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1964                 break;
1965         case 'F': /* CPL -- Cursor <n> Up and first col */
1966                 DEFAULT(csiescseq.arg[0], 1);
1967                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1968                 break;
1969         case 'g': /* TBC -- Tabulation clear */
1970                 switch(csiescseq.arg[0]) {
1971                 case 0: /* clear current tab stop */
1972                         term.tabs[term.c.x] = 0;
1973                         break;
1974                 case 3: /* clear all the tabs */
1975                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1976                         break;
1977                 default:
1978                         goto unknown;
1979                 }
1980                 break;
1981         case 'G': /* CHA -- Move to <col> */
1982         case '`': /* HPA */
1983                 DEFAULT(csiescseq.arg[0], 1);
1984                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1985                 break;
1986         case 'H': /* CUP -- Move to <row> <col> */
1987         case 'f': /* HVP */
1988                 DEFAULT(csiescseq.arg[0], 1);
1989                 DEFAULT(csiescseq.arg[1], 1);
1990                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1991                 break;
1992         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1993                 DEFAULT(csiescseq.arg[0], 1);
1994                 tputtab(csiescseq.arg[0]);
1995                 break;
1996         case 'J': /* ED -- Clear screen */
1997                 selclear(NULL);
1998                 switch(csiescseq.arg[0]) {
1999                 case 0: /* below */
2000                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2001                         if(term.c.y < term.row-1) {
2002                                 tclearregion(0, term.c.y+1, term.col-1,
2003                                                 term.row-1);
2004                         }
2005                         break;
2006                 case 1: /* above */
2007                         if(term.c.y > 1)
2008                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2009                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2010                         break;
2011                 case 2: /* all */
2012                         tclearregion(0, 0, term.col-1, term.row-1);
2013                         break;
2014                 default:
2015                         goto unknown;
2016                 }
2017                 break;
2018         case 'K': /* EL -- Clear line */
2019                 switch(csiescseq.arg[0]) {
2020                 case 0: /* right */
2021                         tclearregion(term.c.x, term.c.y, term.col-1,
2022                                         term.c.y);
2023                         break;
2024                 case 1: /* left */
2025                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2026                         break;
2027                 case 2: /* all */
2028                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2029                         break;
2030                 }
2031                 break;
2032         case 'S': /* SU -- Scroll <n> line up */
2033                 DEFAULT(csiescseq.arg[0], 1);
2034                 tscrollup(term.top, csiescseq.arg[0]);
2035                 break;
2036         case 'T': /* SD -- Scroll <n> line down */
2037                 DEFAULT(csiescseq.arg[0], 1);
2038                 tscrolldown(term.top, csiescseq.arg[0]);
2039                 break;
2040         case 'L': /* IL -- Insert <n> blank lines */
2041                 DEFAULT(csiescseq.arg[0], 1);
2042                 tinsertblankline(csiescseq.arg[0]);
2043                 break;
2044         case 'l': /* RM -- Reset Mode */
2045                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2046                 break;
2047         case 'M': /* DL -- Delete <n> lines */
2048                 DEFAULT(csiescseq.arg[0], 1);
2049                 tdeleteline(csiescseq.arg[0]);
2050                 break;
2051         case 'X': /* ECH -- Erase <n> char */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tclearregion(term.c.x, term.c.y,
2054                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2055                 break;
2056         case 'P': /* DCH -- Delete <n> char */
2057                 DEFAULT(csiescseq.arg[0], 1);
2058                 tdeletechar(csiescseq.arg[0]);
2059                 break;
2060         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2061                 DEFAULT(csiescseq.arg[0], 1);
2062                 tputtab(-csiescseq.arg[0]);
2063                 break;
2064         case 'd': /* VPA -- Move to <row> */
2065                 DEFAULT(csiescseq.arg[0], 1);
2066                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2067                 break;
2068         case 'h': /* SM -- Set terminal mode */
2069                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2070                 break;
2071         case 'm': /* SGR -- Terminal attribute (color) */
2072                 tsetattr(csiescseq.arg, csiescseq.narg);
2073                 break;
2074         case 'n': /* DSR – Device Status Report (cursor position) */
2075                 if (csiescseq.arg[0] == 6) {
2076                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2077                                         term.c.y+1, term.c.x+1);
2078                         ttywrite(buf, len);
2079                 }
2080                 break;
2081         case 'r': /* DECSTBM -- Set Scrolling Region */
2082                 if(csiescseq.priv) {
2083                         goto unknown;
2084                 } else {
2085                         DEFAULT(csiescseq.arg[0], 1);
2086                         DEFAULT(csiescseq.arg[1], term.row);
2087                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2088                         tmoveato(0, 0);
2089                 }
2090                 break;
2091         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2092                 tcursor(CURSOR_SAVE);
2093                 break;
2094         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2095                 tcursor(CURSOR_LOAD);
2096                 break;
2097         }
2098 }
2099
2100 void
2101 csidump(void) {
2102         int i;
2103         uint c;
2104
2105         printf("ESC[");
2106         for(i = 0; i < csiescseq.len; i++) {
2107                 c = csiescseq.buf[i] & 0xff;
2108                 if(isprint(c)) {
2109                         putchar(c);
2110                 } else if(c == '\n') {
2111                         printf("(\\n)");
2112                 } else if(c == '\r') {
2113                         printf("(\\r)");
2114                 } else if(c == 0x1b) {
2115                         printf("(\\e)");
2116                 } else {
2117                         printf("(%02x)", c);
2118                 }
2119         }
2120         putchar('\n');
2121 }
2122
2123 void
2124 csireset(void) {
2125         memset(&csiescseq, 0, sizeof(csiescseq));
2126 }
2127
2128 void
2129 strhandle(void) {
2130         char *p = NULL;
2131         int j, narg, par;
2132
2133         term.esc &= ~(ESC_STR_END|ESC_STR);
2134         strparse();
2135         narg = strescseq.narg;
2136         par = atoi(strescseq.args[0]);
2137
2138         switch(strescseq.type) {
2139         case ']': /* OSC -- Operating System Command */
2140                 switch(par) {
2141                 case 0:
2142                 case 1:
2143                 case 2:
2144                         if(narg > 1)
2145                                 xsettitle(strescseq.args[1]);
2146                         return;
2147                 case 4: /* color set */
2148                         if(narg < 3)
2149                                 break;
2150                         p = strescseq.args[2];
2151                         /* FALLTHROUGH */
2152                 case 104: /* color reset, here p = NULL */
2153                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2154                         if (!xsetcolorname(j, p)) {
2155                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2156                         } else {
2157                                 /*
2158                                  * TODO if defaultbg color is changed, borders
2159                                  * are dirty
2160                                  */
2161                                 redraw(0);
2162                         }
2163                         return;
2164                 }
2165                 break;
2166         case 'k': /* old title set compatibility */
2167                 xsettitle(strescseq.args[0]);
2168                 return;
2169         case 'P': /* DCS -- Device Control String */
2170         case '_': /* APC -- Application Program Command */
2171         case '^': /* PM -- Privacy Message */
2172                 return;
2173         }
2174
2175         fprintf(stderr, "erresc: unknown str ");
2176         strdump();
2177 }
2178
2179 void
2180 strparse(void) {
2181         char *p = strescseq.buf;
2182
2183         strescseq.narg = 0;
2184         strescseq.buf[strescseq.len] = '\0';
2185         while(p && strescseq.narg < STR_ARG_SIZ)
2186                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2187 }
2188
2189 void
2190 strdump(void) {
2191         int i;
2192         uint c;
2193
2194         printf("ESC%c", strescseq.type);
2195         for(i = 0; i < strescseq.len; i++) {
2196                 c = strescseq.buf[i] & 0xff;
2197                 if(c == '\0') {
2198                         return;
2199                 } else if(isprint(c)) {
2200                         putchar(c);
2201                 } else if(c == '\n') {
2202                         printf("(\\n)");
2203                 } else if(c == '\r') {
2204                         printf("(\\r)");
2205                 } else if(c == 0x1b) {
2206                         printf("(\\e)");
2207                 } else {
2208                         printf("(%02x)", c);
2209                 }
2210         }
2211         printf("ESC\\\n");
2212 }
2213
2214 void
2215 strreset(void) {
2216         memset(&strescseq, 0, sizeof(strescseq));
2217 }
2218
2219 void
2220 tprinter(char *s, size_t len) {
2221         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2222                 fprintf(stderr, "Error writing in %s:%s\n",
2223                         opt_io, strerror(errno));
2224                 close(iofd);
2225                 iofd = -1;
2226         }
2227 }
2228
2229 void
2230 toggleprinter(const Arg *arg) {
2231         term.mode ^= MODE_PRINT;
2232 }
2233
2234 void
2235 printscreen(const Arg *arg) {
2236         tdump();
2237 }
2238
2239 void
2240 printsel(const Arg *arg) {
2241         tdumpsel();
2242 }
2243
2244 void
2245 tdumpsel(void) {
2246         char *ptr;
2247
2248         if((ptr = getsel())) {
2249                 tprinter(ptr, strlen(ptr));
2250                 free(ptr);
2251         }
2252 }
2253
2254 void
2255 tdumpline(int n) {
2256         Glyph *bp, *end;
2257
2258         bp = &term.line[n][0];
2259         end = &bp[term.col-1];
2260         while(end > bp && !strcmp(" ", end->c))
2261                 --end;
2262         if(bp != end || strcmp(bp->c, " ")) {
2263                 for( ;bp <= end; ++bp)
2264                         tprinter(bp->c, strlen(bp->c));
2265         }
2266         tprinter("\n", 1);
2267 }
2268
2269 void
2270 tdump(void) {
2271         int i;
2272
2273         for(i = 0; i < term.row; ++i)
2274                 tdumpline(i);
2275 }
2276
2277 void
2278 tputtab(int n) {
2279         uint x = term.c.x;
2280
2281         if(n > 0) {
2282                 while(x < term.col && n--)
2283                         for(++x; x < term.col && !term.tabs[x]; ++x)
2284                                 /* nothing */ ;
2285         } else if(n < 0) {
2286                 while(x > 0 && n++)
2287                         for(--x; x > 0 && !term.tabs[x]; --x)
2288                                 /* nothing */ ;
2289         }
2290         tmoveto(x, term.c.y);
2291 }
2292
2293 void
2294 techo(char *buf, int len) {
2295         for(; len > 0; buf++, len--) {
2296                 char c = *buf;
2297
2298                 if(ISCONTROL(c)) { /* control code */
2299                         if(c & 0x80) {
2300                                 c &= 0x7f;
2301                                 tputc("^", 1);
2302                                 tputc("[", 1);
2303                         } else if(c != '\n' && c != '\r' && c != '\t') {
2304                                 c ^= '\x40';
2305                                 tputc("^", 1);
2306                         }
2307                         tputc(&c, 1);
2308                 } else {
2309                         break;
2310                 }
2311         }
2312         if(len)
2313                 tputc(buf, len);
2314 }
2315
2316 void
2317 tdeftran(char ascii) {
2318         char c, (*bp)[2];
2319         static char tbl[][2] = {
2320                 {'0', CS_GRAPHIC0}, {'B', CS_USA},
2321                 {0, 0}
2322         };
2323
2324         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2325                 /* nothing */;
2326
2327         if (c == 0)
2328                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2329         else
2330                 term.trantbl[term.icharset] = (*bp)[1];
2331 }
2332
2333 void
2334 tcontrolcode(uchar ascii) {
2335         static char question[UTF_SIZ] = "?";
2336
2337         switch(ascii) {
2338         case '\t':   /* HT */
2339                 tputtab(1);
2340                 return;
2341         case '\b':   /* BS */
2342                 tmoveto(term.c.x-1, term.c.y);
2343                 return;
2344         case '\r':   /* CR */
2345                 tmoveto(0, term.c.y);
2346                 return;
2347         case '\f':   /* LF */
2348         case '\v':   /* VT */
2349         case '\n':   /* LF */
2350                 /* go to first col if the mode is set */
2351                 tnewline(IS_SET(MODE_CRLF));
2352                 return;
2353         case '\a':   /* BEL */
2354                 if(term.esc & ESC_STR_END) {
2355                         /* backwards compatibility to xterm */
2356                         strhandle();
2357                 } else {
2358                         if(!(xw.state & WIN_FOCUSED))
2359                                 xseturgency(1);
2360                         if (bellvolume)
2361                                 XBell(xw.dpy, bellvolume);
2362                 }
2363                 break;
2364         case '\033': /* ESC */
2365                 csireset();
2366                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2367                 term.esc |= ESC_START;
2368                 return;
2369         case '\016': /* SO */
2370                 term.charset = 0;
2371                 return;
2372         case '\017': /* SI */
2373                 term.charset = 1;
2374                 return;
2375         case '\032': /* SUB */
2376                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2377         case '\030': /* CAN */
2378                 csireset();
2379                 break;
2380         case '\005': /* ENQ (IGNORED) */
2381         case '\000': /* NUL (IGNORED) */
2382         case '\021': /* XON (IGNORED) */
2383         case '\023': /* XOFF (IGNORED) */
2384         case 0177:   /* DEL (IGNORED) */
2385                 return;
2386         case 0x84:   /* TODO: IND */
2387         case 0x85:   /* TODO: NEL */
2388         case 0x88:   /* TODO: HTS */
2389         case 0x8d:   /* TODO: RI */
2390         case 0x8e:   /* TODO: SS2 */
2391         case 0x8f:   /* TODO: SS3 */
2392         case 0x90:   /* TODO: DCS */
2393         case 0x98:   /* TODO: SOS */
2394         case 0x9a:   /* TODO: DECID */
2395         case 0x9b:   /* TODO: CSI */
2396         case 0x9c:   /* TODO: ST */
2397         case 0x9d:   /* TODO: OSC */
2398         case 0x9e:   /* TODO: PM */
2399         case 0x9f:   /* TODO: APC */
2400                 break;
2401         }
2402         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2403         term.esc &= ~(ESC_STR_END|ESC_STR);
2404         return;
2405 }
2406
2407 void
2408 tdectest(char c) {
2409         static char E[UTF_SIZ] = "E";
2410         int x, y;
2411
2412         if(c == '8') { /* DEC screen alignment test. */
2413                 for(x = 0; x < term.col; ++x) {
2414                         for(y = 0; y < term.row; ++y)
2415                                 tsetchar(E, &term.c.attr, x, y);
2416                 }
2417         }
2418 }
2419
2420 void
2421 tputc(char *c, int len) {
2422         uchar ascii;
2423         bool control;
2424         long unicodep;
2425         int width;
2426         Glyph *gp;
2427
2428         if(len == 1) {
2429                 width = 1;
2430                 unicodep = ascii = *c;
2431         } else {
2432                 utf8decode(c, &unicodep, UTF_SIZ);
2433                 width = wcwidth(unicodep);
2434                 control = ISCONTROLC1(unicodep);
2435                 ascii = unicodep;
2436         }
2437
2438         if(IS_SET(MODE_PRINT))
2439                 tprinter(c, len);
2440         control = ISCONTROL(unicodep);
2441
2442         /*
2443          * STR sequence must be checked before anything else
2444          * because it uses all following characters until it
2445          * receives a ESC, a SUB, a ST or any other C1 control
2446          * character.
2447          */
2448         if(term.esc & ESC_STR) {
2449                 if(width == 1 &&
2450                    (ascii == '\a' || ascii == 030 ||
2451                     ascii == 032  || ascii == 033 ||
2452                     ISCONTROLC1(unicodep))) {
2453                         term.esc &= ~(ESC_START|ESC_STR);
2454                         term.esc |= ESC_STR_END;
2455                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2456                         memmove(&strescseq.buf[strescseq.len], c, len);
2457                         strescseq.len += len;
2458                         return;
2459                 } else {
2460                 /*
2461                  * Here is a bug in terminals. If the user never sends
2462                  * some code to stop the str or esc command, then st
2463                  * will stop responding. But this is better than
2464                  * silently failing with unknown characters. At least
2465                  * then users will report back.
2466                  *
2467                  * In the case users ever get fixed, here is the code:
2468                  */
2469                 /*
2470                  * term.esc = 0;
2471                  * strhandle();
2472                  */
2473                         return;
2474                 }
2475         }
2476
2477         /*
2478          * Actions of control codes must be performed as soon they arrive
2479          * because they can be embedded inside a control sequence, and
2480          * they must not cause conflicts with sequences.
2481          */
2482         if(control) {
2483                 tcontrolcode(ascii);
2484                 /*
2485                  * control codes are not shown ever
2486                  */
2487                 return;
2488         } else if(term.esc & ESC_START) {
2489                 if(term.esc & ESC_CSI) {
2490                         csiescseq.buf[csiescseq.len++] = ascii;
2491                         if(BETWEEN(ascii, 0x40, 0x7E)
2492                                         || csiescseq.len >= \
2493                                         sizeof(csiescseq.buf)-1) {
2494                                 term.esc = 0;
2495                                 csiparse();
2496                                 csihandle();
2497                         }
2498                         return;
2499                 } else if(term.esc & ESC_ALTCHARSET) {
2500                         tdeftran(ascii);
2501                 } else if(term.esc & ESC_TEST) {
2502                         tdectest(ascii);
2503                 } else {
2504                         switch(ascii) {
2505                         case '[':
2506                                 term.esc |= ESC_CSI;
2507                                 return;
2508                         case '#':
2509                                 term.esc |= ESC_TEST;
2510                                 return;
2511                         case 'P': /* DCS -- Device Control String */
2512                         case '_': /* APC -- Application Program Command */
2513                         case '^': /* PM -- Privacy Message */
2514                         case ']': /* OSC -- Operating System Command */
2515                         case 'k': /* old title set compatibility */
2516                                 strreset();
2517                                 strescseq.type = ascii;
2518                                 term.esc |= ESC_STR;
2519                                 return;
2520                         case '(': /* set primary charset G0 */
2521                         case ')': /* set secondary charset G1 */
2522                         case '*': /* set tertiary charset G2 */
2523                         case '+': /* set quaternary charset G3 */
2524                                 term.icharset = ascii - '(';
2525                                 term.esc |= ESC_ALTCHARSET;
2526                                 return;
2527                         case 'D': /* IND -- Linefeed */
2528                                 if(term.c.y == term.bot) {
2529                                         tscrollup(term.top, 1);
2530                                 } else {
2531                                         tmoveto(term.c.x, term.c.y+1);
2532                                 }
2533                                 break;
2534                         case 'E': /* NEL -- Next line */
2535                                 tnewline(1); /* always go to first col */
2536                                 break;
2537                         case 'H': /* HTS -- Horizontal tab stop */
2538                                 term.tabs[term.c.x] = 1;
2539                                 break;
2540                         case 'M': /* RI -- Reverse index */
2541                                 if(term.c.y == term.top) {
2542                                         tscrolldown(term.top, 1);
2543                                 } else {
2544                                         tmoveto(term.c.x, term.c.y-1);
2545                                 }
2546                                 break;
2547                         case 'Z': /* DECID -- Identify Terminal */
2548                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2549                                 break;
2550                         case 'c': /* RIS -- Reset to inital state */
2551                                 treset();
2552                                 xresettitle();
2553                                 xloadcols();
2554                                 break;
2555                         case '=': /* DECPAM -- Application keypad */
2556                                 term.mode |= MODE_APPKEYPAD;
2557                                 break;
2558                         case '>': /* DECPNM -- Normal keypad */
2559                                 term.mode &= ~MODE_APPKEYPAD;
2560                                 break;
2561                         case '7': /* DECSC -- Save Cursor */
2562                                 tcursor(CURSOR_SAVE);
2563                                 break;
2564                         case '8': /* DECRC -- Restore Cursor */
2565                                 tcursor(CURSOR_LOAD);
2566                                 break;
2567                         case '\\': /* ST -- String Terminator */
2568                                 if(term.esc & ESC_STR_END)
2569                                         strhandle();
2570                                 break;
2571                         default:
2572                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2573                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2574                                 break;
2575                         }
2576                 }
2577                 term.esc = 0;
2578                 /*
2579                  * All characters which form part of a sequence are not
2580                  * printed
2581                  */
2582                 return;
2583         }
2584         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2585                 selclear(NULL);
2586
2587         gp = &term.line[term.c.y][term.c.x];
2588         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2589                 gp->mode |= ATTR_WRAP;
2590                 tnewline(1);
2591         }
2592
2593         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2594                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2595
2596         if(term.c.x+width > term.col)
2597                 tnewline(1);
2598
2599         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2600
2601         if(width == 2) {
2602                 gp->mode |= ATTR_WIDE;
2603                 if(term.c.x+1 < term.col) {
2604                         gp[1].c[0] = '\0';
2605                         gp[1].mode = ATTR_WDUMMY;
2606                 }
2607         }
2608         if(term.c.x+width < term.col) {
2609                 tmoveto(term.c.x+width, term.c.y);
2610         } else {
2611                 term.c.state |= CURSOR_WRAPNEXT;
2612         }
2613 }
2614
2615 int
2616 tresize(int col, int row) {
2617         int i;
2618         int minrow = MIN(row, term.row);
2619         int mincol = MIN(col, term.col);
2620         int slide = term.c.y - row + 1;
2621         bool *bp;
2622         Line *orig;
2623         TCursor c;
2624
2625         if(col < 1 || row < 1)
2626                 return 0;
2627
2628         /* free unneeded rows */
2629         i = 0;
2630         if(slide > 0) {
2631                 /*
2632                  * slide screen to keep cursor where we expect it -
2633                  * tscrollup would work here, but we can optimize to
2634                  * memmove because we're freeing the earlier lines
2635                  */
2636                 for(/* i = 0 */; i < slide; i++) {
2637                         free(term.line[i]);
2638                         free(term.alt[i]);
2639                 }
2640                 memmove(term.line, term.line + slide, row * sizeof(Line));
2641                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2642         }
2643         for(i += row; i < term.row; i++) {
2644                 free(term.line[i]);
2645                 free(term.alt[i]);
2646         }
2647
2648         /* resize to new height */
2649         term.line = xrealloc(term.line, row * sizeof(Line));
2650         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2651         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2652         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2653
2654         /* resize each row to new width, zero-pad if needed */
2655         for(i = 0; i < minrow; i++) {
2656                 term.dirty[i] = 1;
2657                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2658                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2659         }
2660
2661         /* allocate any new rows */
2662         for(/* i == minrow */; i < row; i++) {
2663                 term.dirty[i] = 1;
2664                 term.line[i] = xmalloc(col * sizeof(Glyph));
2665                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2666         }
2667         if(col > term.col) {
2668                 bp = term.tabs + term.col;
2669
2670                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2671                 while(--bp > term.tabs && !*bp)
2672                         /* nothing */ ;
2673                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2674                         *bp = 1;
2675         }
2676         /* update terminal size */
2677         term.col = col;
2678         term.row = row;
2679         /* reset scrolling region */
2680         tsetscroll(0, row-1);
2681         /* make use of the LIMIT in tmoveto */
2682         tmoveto(term.c.x, term.c.y);
2683         /* Clearing both screens */
2684         orig = term.line;
2685         c = term.c;
2686         do {
2687                 if(mincol < col && 0 < minrow) {
2688                         tclearregion(mincol, 0, col - 1, minrow - 1);
2689                 }
2690                 if(0 < col && minrow < row) {
2691                         tclearregion(0, minrow, col - 1, row - 1);
2692                 }
2693                 tswapscreen();
2694                 tcursor(CURSOR_LOAD);
2695         } while(orig != term.line);
2696         term.c = c;
2697
2698         return (slide > 0);
2699 }
2700
2701 void
2702 xresize(int col, int row) {
2703         xw.tw = MAX(1, col * xw.cw);
2704         xw.th = MAX(1, row * xw.ch);
2705
2706         XFreePixmap(xw.dpy, xw.buf);
2707         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2708                         DefaultDepth(xw.dpy, xw.scr));
2709         XftDrawChange(xw.draw, xw.buf);
2710         xclear(0, 0, xw.w, xw.h);
2711 }
2712
2713 static inline ushort
2714 sixd_to_16bit(int x) {
2715         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2716 }
2717
2718 void
2719 xloadcols(void) {
2720         int i;
2721         XRenderColor color = { .alpha = 0xffff };
2722         static bool loaded;
2723         Colour *cp;
2724
2725         if(loaded) {
2726                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2727                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2728         }
2729
2730         /* load colours [0-15] and [256-LEN(colorname)] (config.h) */
2731         for(i = 0; i < LEN(colorname); i++) {
2732                 if(!colorname[i])
2733                         continue;
2734                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2735                         die("Could not allocate color '%s'\n", colorname[i]);
2736                 }
2737         }
2738
2739         /* load colours [16-231] ; same colours as xterm */
2740         for(i = 16; i < 6*6*6+16; i++) {
2741                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2742                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2743                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2744                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2745                         die("Could not allocate color %d\n", i);
2746         }
2747
2748         /* load colours [232-255] ; grayscale */
2749         for(; i < 256; i++) {
2750                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2751                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2752                         die("Could not allocate color %d\n", i);
2753         }
2754         loaded = true;
2755 }
2756
2757 int
2758 xsetcolorname(int x, const char *name) {
2759         XRenderColor color = { .alpha = 0xffff };
2760         Colour colour;
2761         if(!BETWEEN(x, 0, LEN(colorname)))
2762                 return -1;
2763         if(!name) {
2764                 if(BETWEEN(x, 16, 16 + 215)) {
2765                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2766                         color.red = sixd_to_16bit(r);
2767                         color.green = sixd_to_16bit(g);
2768                         color.blue = sixd_to_16bit(b);
2769                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2770                                 return 0; /* something went wrong */
2771                         dc.col[x] = colour;
2772                         return 1;
2773                 } else if(BETWEEN(x, 16 + 216, 255)) {
2774                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2775                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2776                                 return 0; /* something went wrong */
2777                         dc.col[x] = colour;
2778                         return 1;
2779                 } else {
2780                         name = colorname[x];
2781                 }
2782         }
2783         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2784                 return 0;
2785         dc.col[x] = colour;
2786         return 1;
2787 }
2788
2789 void
2790 xtermclear(int col1, int row1, int col2, int row2) {
2791         XftDrawRect(xw.draw,
2792                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2793                         borderpx + col1 * xw.cw,
2794                         borderpx + row1 * xw.ch,
2795                         (col2-col1+1) * xw.cw,
2796                         (row2-row1+1) * xw.ch);
2797 }
2798
2799 /*
2800  * Absolute coordinates.
2801  */
2802 void
2803 xclear(int x1, int y1, int x2, int y2) {
2804         XftDrawRect(xw.draw,
2805                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2806                         x1, y1, x2-x1, y2-y1);
2807 }
2808
2809 void
2810 xhints(void) {
2811         XClassHint class = {opt_class ? opt_class : termname, termname};
2812         XWMHints wm = {.flags = InputHint, .input = 1};
2813         XSizeHints *sizeh = NULL;
2814
2815         sizeh = XAllocSizeHints();
2816
2817         sizeh->flags = PSize | PResizeInc | PBaseSize;
2818         sizeh->height = xw.h;
2819         sizeh->width = xw.w;
2820         sizeh->height_inc = xw.ch;
2821         sizeh->width_inc = xw.cw;
2822         sizeh->base_height = 2 * borderpx;
2823         sizeh->base_width = 2 * borderpx;
2824         if(xw.isfixed == True) {
2825                 sizeh->flags |= PMaxSize | PMinSize;
2826                 sizeh->min_width = sizeh->max_width = xw.w;
2827                 sizeh->min_height = sizeh->max_height = xw.h;
2828         }
2829         if(xw.gm & (XValue|YValue)) {
2830                 sizeh->flags |= USPosition | PWinGravity;
2831                 sizeh->x = xw.l;
2832                 sizeh->y = xw.t;
2833                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2834         }
2835
2836         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2837                         &class);
2838         XFree(sizeh);
2839 }
2840
2841 int
2842 xgeommasktogravity(int mask) {
2843         switch(mask & (XNegative|YNegative)) {
2844         case 0:
2845                 return NorthWestGravity;
2846         case XNegative:
2847                 return NorthEastGravity;
2848         case YNegative:
2849                 return SouthWestGravity;
2850         }
2851         return SouthEastGravity;
2852 }
2853
2854 int
2855 xloadfont(Font *f, FcPattern *pattern) {
2856         FcPattern *match;
2857         FcResult result;
2858
2859         match = FcFontMatch(NULL, pattern, &result);
2860         if(!match)
2861                 return 1;
2862
2863         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2864                 FcPatternDestroy(match);
2865                 return 1;
2866         }
2867
2868         f->set = NULL;
2869         f->pattern = FcPatternDuplicate(pattern);
2870
2871         f->ascent = f->match->ascent;
2872         f->descent = f->match->descent;
2873         f->lbearing = 0;
2874         f->rbearing = f->match->max_advance_width;
2875
2876         f->height = f->ascent + f->descent;
2877         f->width = f->lbearing + f->rbearing;
2878
2879         return 0;
2880 }
2881
2882 void
2883 xloadfonts(char *fontstr, double fontsize) {
2884         FcPattern *pattern;
2885         FcResult r_sz, r_psz;
2886         double fontval;
2887
2888         if(fontstr[0] == '-') {
2889                 pattern = XftXlfdParse(fontstr, False, False);
2890         } else {
2891                 pattern = FcNameParse((FcChar8 *)fontstr);
2892         }
2893
2894         if(!pattern)
2895                 die("st: can't open font %s\n", fontstr);
2896
2897         if(fontsize > 0) {
2898                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2899                 FcPatternDel(pattern, FC_SIZE);
2900                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2901                 usedfontsize = fontsize;
2902         } else {
2903                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2904                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2905                 if(r_psz == FcResultMatch) {
2906                         usedfontsize = fontval;
2907                 } else if(r_sz == FcResultMatch) {
2908                         usedfontsize = -1;
2909                 } else {
2910                         /*
2911                          * Default font size is 12, if none given. This is to
2912                          * have a known usedfontsize value.
2913                          */
2914                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2915                         usedfontsize = 12;
2916                 }
2917         }
2918
2919         FcConfigSubstitute(0, pattern, FcMatchPattern);
2920         FcDefaultSubstitute(pattern);
2921
2922         if(xloadfont(&dc.font, pattern))
2923                 die("st: can't open font %s\n", fontstr);
2924
2925         if(usedfontsize < 0) {
2926                 FcPatternGetDouble(dc.font.match->pattern,
2927                                    FC_PIXEL_SIZE, 0, &fontval);
2928                 usedfontsize = fontval;
2929         }
2930
2931         /* Setting character width and height. */
2932         xw.cw = CEIL(dc.font.width * cwscale);
2933         xw.ch = CEIL(dc.font.height * chscale);
2934
2935         FcPatternDel(pattern, FC_SLANT);
2936         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2937         if(xloadfont(&dc.ifont, pattern))
2938                 die("st: can't open font %s\n", fontstr);
2939
2940         FcPatternDel(pattern, FC_WEIGHT);
2941         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2942         if(xloadfont(&dc.ibfont, pattern))
2943                 die("st: can't open font %s\n", fontstr);
2944
2945         FcPatternDel(pattern, FC_SLANT);
2946         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2947         if(xloadfont(&dc.bfont, pattern))
2948                 die("st: can't open font %s\n", fontstr);
2949
2950         FcPatternDestroy(pattern);
2951 }
2952
2953 int
2954 xloadfontset(Font *f) {
2955         FcResult result;
2956
2957         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2958                 return 1;
2959         return 0;
2960 }
2961
2962 void
2963 xunloadfont(Font *f) {
2964         XftFontClose(xw.dpy, f->match);
2965         FcPatternDestroy(f->pattern);
2966         if(f->set)
2967                 FcFontSetDestroy(f->set);
2968 }
2969
2970 void
2971 xunloadfonts(void) {
2972         /* Free the loaded fonts in the font cache.  */
2973         while(frclen > 0)
2974                 XftFontClose(xw.dpy, frc[--frclen].font);
2975
2976         xunloadfont(&dc.font);
2977         xunloadfont(&dc.bfont);
2978         xunloadfont(&dc.ifont);
2979         xunloadfont(&dc.ibfont);
2980 }
2981
2982 void
2983 xzoom(const Arg *arg) {
2984         xunloadfonts();
2985         xloadfonts(usedfont, usedfontsize + arg->i);
2986         cresize(0, 0);
2987         redraw(0);
2988 }
2989
2990 void
2991 xinit(void) {
2992         XGCValues gcvalues;
2993         Cursor cursor;
2994         Window parent;
2995         pid_t thispid = getpid();
2996
2997         if(!(xw.dpy = XOpenDisplay(NULL)))
2998                 die("Can't open display\n");
2999         xw.scr = XDefaultScreen(xw.dpy);
3000         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3001
3002         /* font */
3003         if(!FcInit())
3004                 die("Could not init fontconfig.\n");
3005
3006         usedfont = (opt_font == NULL)? font : opt_font;
3007         xloadfonts(usedfont, 0);
3008
3009         /* colors */
3010         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3011         xloadcols();
3012
3013         /* adjust fixed window geometry */
3014         xw.w = 2 * borderpx + term.col * xw.cw;
3015         xw.h = 2 * borderpx + term.row * xw.ch;
3016         if(xw.gm & XNegative)
3017                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3018         if(xw.gm & YNegative)
3019                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3020
3021         /* Events */
3022         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3023         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3024         xw.attrs.bit_gravity = NorthWestGravity;
3025         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3026                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3027                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3028         xw.attrs.colormap = xw.cmap;
3029
3030         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3031                         XRootWindow(xw.dpy, xw.scr);
3032         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3033                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3034                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3035                         | CWEventMask | CWColormap, &xw.attrs);
3036
3037         memset(&gcvalues, 0, sizeof(gcvalues));
3038         gcvalues.graphics_exposures = False;
3039         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3040                         &gcvalues);
3041         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3042                         DefaultDepth(xw.dpy, xw.scr));
3043         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3044         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3045
3046         /* Xft rendering context */
3047         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3048
3049         /* input methods */
3050         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3051                 XSetLocaleModifiers("@im=local");
3052                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3053                         XSetLocaleModifiers("@im=");
3054                         if((xw.xim = XOpenIM(xw.dpy,
3055                                         NULL, NULL, NULL)) == NULL) {
3056                                 die("XOpenIM failed. Could not open input"
3057                                         " device.\n");
3058                         }
3059                 }
3060         }
3061         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3062                                            | XIMStatusNothing, XNClientWindow, xw.win,
3063                                            XNFocusWindow, xw.win, NULL);
3064         if(xw.xic == NULL)
3065                 die("XCreateIC failed. Could not obtain input method.\n");
3066
3067         /* white cursor, black outline */
3068         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3069         XDefineCursor(xw.dpy, xw.win, cursor);
3070         XRecolorCursor(xw.dpy, cursor,
3071                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3072                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3073
3074         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3075         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3076         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3077         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3078
3079         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3080         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3081                         PropModeReplace, (uchar *)&thispid, 1);
3082
3083         xresettitle();
3084         XMapWindow(xw.dpy, xw.win);
3085         xhints();
3086         XSync(xw.dpy, False);
3087 }
3088
3089 void
3090 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3091         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3092             width = charlen * xw.cw, xp, i;
3093         int frcflags;
3094         int u8fl, u8fblen, u8cblen, doesexist;
3095         char *u8c, *u8fs;
3096         long unicodep;
3097         Font *font = &dc.font;
3098         FcResult fcres;
3099         FcPattern *fcpattern, *fontpattern;
3100         FcFontSet *fcsets[] = { NULL };
3101         FcCharSet *fccharset;
3102         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3103         XRenderColor colfg, colbg;
3104         XRectangle r;
3105         int oneatatime;
3106
3107         frcflags = FRC_NORMAL;
3108
3109         if(base.mode & ATTR_ITALIC) {
3110                 if(base.fg == defaultfg)
3111                         base.fg = defaultitalic;
3112                 font = &dc.ifont;
3113                 frcflags = FRC_ITALIC;
3114         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3115                 if(base.fg == defaultfg)
3116                         base.fg = defaultitalic;
3117                 font = &dc.ibfont;
3118                 frcflags = FRC_ITALICBOLD;
3119         } else if(base.mode & ATTR_UNDERLINE) {
3120                 if(base.fg == defaultfg)
3121                         base.fg = defaultunderline;
3122         }
3123
3124         if(IS_TRUECOL(base.fg)) {
3125                 colfg.alpha = 0xffff;
3126                 colfg.red = TRUERED(base.fg);
3127                 colfg.green = TRUEGREEN(base.fg);
3128                 colfg.blue = TRUEBLUE(base.fg);
3129                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3130                 fg = &truefg;
3131         } else {
3132                 fg = &dc.col[base.fg];
3133         }
3134
3135         if(IS_TRUECOL(base.bg)) {
3136                 colbg.alpha = 0xffff;
3137                 colbg.green = TRUEGREEN(base.bg);
3138                 colbg.red = TRUERED(base.bg);
3139                 colbg.blue = TRUEBLUE(base.bg);
3140                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3141                 bg = &truebg;
3142         } else {
3143                 bg = &dc.col[base.bg];
3144         }
3145
3146         if(base.mode & ATTR_BOLD) {
3147                 /*
3148                  * change basic system colours [0-7]
3149                  * to bright system colours [8-15]
3150                  */
3151                 if(BETWEEN(base.fg, 0, 7))
3152                         fg = &dc.col[base.fg + 8];
3153
3154                 if(base.mode & ATTR_ITALIC) {
3155                         font = &dc.ibfont;
3156                         frcflags = FRC_ITALICBOLD;
3157                 } else {
3158                         font = &dc.bfont;
3159                         frcflags = FRC_BOLD;
3160                 }
3161         }
3162
3163         if(IS_SET(MODE_REVERSE)) {
3164                 if(fg == &dc.col[defaultfg]) {
3165                         fg = &dc.col[defaultbg];
3166                 } else {
3167                         colfg.red = ~fg->color.red;
3168                         colfg.green = ~fg->color.green;
3169                         colfg.blue = ~fg->color.blue;
3170                         colfg.alpha = fg->color.alpha;
3171                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3172                                         &revfg);
3173                         fg = &revfg;
3174                 }
3175
3176                 if(bg == &dc.col[defaultbg]) {
3177                         bg = &dc.col[defaultfg];
3178                 } else {
3179                         colbg.red = ~bg->color.red;
3180                         colbg.green = ~bg->color.green;
3181                         colbg.blue = ~bg->color.blue;
3182                         colbg.alpha = bg->color.alpha;
3183                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3184                                         &revbg);
3185                         bg = &revbg;
3186                 }
3187         }
3188
3189         if(base.mode & ATTR_REVERSE) {
3190                 temp = fg;
3191                 fg = bg;
3192                 bg = temp;
3193         }
3194
3195         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3196                 fg = bg;
3197
3198         /* Intelligent cleaning up of the borders. */
3199         if(x == 0) {
3200                 xclear(0, (y == 0)? 0 : winy, borderpx,
3201                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3202         }
3203         if(x + charlen >= term.col) {
3204                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3205                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3206         }
3207         if(y == 0)
3208                 xclear(winx, 0, winx + width, borderpx);
3209         if(y == term.row-1)
3210                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3211
3212         /* Clean up the region we want to draw to. */
3213         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3214
3215         /* Set the clip region because Xft is sometimes dirty. */
3216         r.x = 0;
3217         r.y = 0;
3218         r.height = xw.ch;
3219         r.width = width;
3220         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3221
3222         for(xp = winx; bytelen > 0;) {
3223                 /*
3224                  * Search for the range in the to be printed string of glyphs
3225                  * that are in the main font. Then print that range. If
3226                  * some glyph is found that is not in the font, do the
3227                  * fallback dance.
3228                  */
3229                 u8fs = s;
3230                 u8fblen = 0;
3231                 u8fl = 0;
3232                 oneatatime = font->width != xw.cw;
3233                 for(;;) {
3234                         u8c = s;
3235                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3236                         s += u8cblen;
3237                         bytelen -= u8cblen;
3238
3239                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3240                         if(oneatatime || !doesexist || bytelen <= 0) {
3241                                 if(oneatatime || bytelen <= 0) {
3242                                         if(doesexist) {
3243                                                 u8fl++;
3244                                                 u8fblen += u8cblen;
3245                                         }
3246                                 }
3247
3248                                 if(u8fl > 0) {
3249                                         XftDrawStringUtf8(xw.draw, fg,
3250                                                         font->match, xp,
3251                                                         winy + font->ascent,
3252                                                         (FcChar8 *)u8fs,
3253                                                         u8fblen);
3254                                         xp += xw.cw * u8fl;
3255
3256                                 }
3257                                 break;
3258                         }
3259
3260                         u8fl++;
3261                         u8fblen += u8cblen;
3262                 }
3263                 if(doesexist) {
3264                         if(oneatatime)
3265                                 continue;
3266                         break;
3267                 }
3268
3269                 /* Search the font cache. */
3270                 for(i = 0; i < frclen; i++) {
3271                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3272                                         && frc[i].flags == frcflags) {
3273                                 break;
3274                         }
3275                 }
3276
3277                 /* Nothing was found. */
3278                 if(i >= frclen) {
3279                         if(!font->set)
3280                                 xloadfontset(font);
3281                         fcsets[0] = font->set;
3282
3283                         /*
3284                          * Nothing was found in the cache. Now use
3285                          * some dozen of Fontconfig calls to get the
3286                          * font for one single character.
3287                          *
3288                          * Xft and fontconfig are design failures.
3289                          */
3290                         fcpattern = FcPatternDuplicate(font->pattern);
3291                         fccharset = FcCharSetCreate();
3292
3293                         FcCharSetAddChar(fccharset, unicodep);
3294                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3295                                         fccharset);
3296                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3297                                         FcTrue);
3298
3299                         FcConfigSubstitute(0, fcpattern,
3300                                         FcMatchPattern);
3301                         FcDefaultSubstitute(fcpattern);
3302
3303                         fontpattern = FcFontSetMatch(0, fcsets,
3304                                         FcTrue, fcpattern, &fcres);
3305
3306                         /*
3307                          * Overwrite or create the new cache entry.
3308                          */
3309                         if(frclen >= LEN(frc)) {
3310                                 frclen = LEN(frc) - 1;
3311                                 XftFontClose(xw.dpy, frc[frclen].font);
3312                         }
3313
3314                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3315                                         fontpattern);
3316                         frc[frclen].flags = frcflags;
3317
3318                         i = frclen;
3319                         frclen++;
3320
3321                         FcPatternDestroy(fcpattern);
3322                         FcCharSetDestroy(fccharset);
3323                 }
3324
3325                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3326                                 xp, winy + frc[i].font->ascent,
3327                                 (FcChar8 *)u8c, u8cblen);
3328
3329                 xp += xw.cw * wcwidth(unicodep);
3330         }
3331
3332         /*
3333          * This is how the loop above actually should be. Why does the
3334          * application have to care about font details?
3335          *
3336          * I have to repeat: Xft and Fontconfig are design failures.
3337          */
3338         /*
3339         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3340                         winy + font->ascent, (FcChar8 *)s, bytelen);
3341         */
3342
3343         if(base.mode & ATTR_UNDERLINE) {
3344                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3345                                 width, 1);
3346         }
3347
3348         /* Reset clip to none. */
3349         XftDrawSetClip(xw.draw, 0);
3350 }
3351
3352 void
3353 xdrawcursor(void) {
3354         static int oldx = 0, oldy = 0;
3355         int sl, width, curx;
3356         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3357
3358         LIMIT(oldx, 0, term.col-1);
3359         LIMIT(oldy, 0, term.row-1);
3360
3361         curx = term.c.x;
3362
3363         /* adjust position if in dummy */
3364         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3365                 oldx--;
3366         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3367                 curx--;
3368
3369         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3370
3371         /* remove the old cursor */
3372         sl = utf8len(term.line[oldy][oldx].c);
3373         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3374         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3375                         oldy, width, sl);
3376
3377         /* draw the new one */
3378         if(!(IS_SET(MODE_HIDE))) {
3379                 if(xw.state & WIN_FOCUSED) {
3380                         if(IS_SET(MODE_REVERSE)) {
3381                                 g.mode |= ATTR_REVERSE;
3382                                 g.fg = defaultcs;
3383                                 g.bg = defaultfg;
3384                         }
3385
3386                         sl = utf8len(g.c);
3387                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3388                                 ? 2 : 1;
3389                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3390                 } else {
3391                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3392                                         borderpx + curx * xw.cw,
3393                                         borderpx + term.c.y * xw.ch,
3394                                         xw.cw - 1, 1);
3395                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3396                                         borderpx + curx * xw.cw,
3397                                         borderpx + term.c.y * xw.ch,
3398                                         1, xw.ch - 1);
3399                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3400                                         borderpx + (curx + 1) * xw.cw - 1,
3401                                         borderpx + term.c.y * xw.ch,
3402                                         1, xw.ch - 1);
3403                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3404                                         borderpx + curx * xw.cw,
3405                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3406                                         xw.cw, 1);
3407                 }
3408                 oldx = curx, oldy = term.c.y;
3409         }
3410 }
3411
3412
3413 void
3414 xsettitle(char *p) {
3415         XTextProperty prop;
3416
3417         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3418                         &prop);
3419         XSetWMName(xw.dpy, xw.win, &prop);
3420         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3421         XFree(prop.value);
3422 }
3423
3424 void
3425 xresettitle(void) {
3426         xsettitle(opt_title ? opt_title : "st");
3427 }
3428
3429 void
3430 redraw(int timeout) {
3431         struct timespec tv = {0, timeout * 1000};
3432
3433         tfulldirt();
3434         draw();
3435
3436         if(timeout > 0) {
3437                 nanosleep(&tv, NULL);
3438                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3439         }
3440 }
3441
3442 void
3443 draw(void) {
3444         drawregion(0, 0, term.col, term.row);
3445         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3446                         xw.h, 0, 0);
3447         XSetForeground(xw.dpy, dc.gc,
3448                         dc.col[IS_SET(MODE_REVERSE)?
3449                                 defaultfg : defaultbg].pixel);
3450 }
3451
3452 void
3453 drawregion(int x1, int y1, int x2, int y2) {
3454         int ic, ib, x, y, ox, sl;
3455         Glyph base, new;
3456         char buf[DRAW_BUF_SIZ];
3457         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3458         long unicodep;
3459
3460         if(!(xw.state & WIN_VISIBLE))
3461                 return;
3462
3463         for(y = y1; y < y2; y++) {
3464                 if(!term.dirty[y])
3465                         continue;
3466
3467                 xtermclear(0, y, term.col, y);
3468                 term.dirty[y] = 0;
3469                 base = term.line[y][0];
3470                 ic = ib = ox = 0;
3471                 for(x = x1; x < x2; x++) {
3472                         new = term.line[y][x];
3473                         if(new.mode == ATTR_WDUMMY)
3474                                 continue;
3475                         if(ena_sel && selected(x, y))
3476                                 new.mode ^= ATTR_REVERSE;
3477                         if(ib > 0 && (ATTRCMP(base, new)
3478                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3479                                 xdraws(buf, base, ox, y, ic, ib);
3480                                 ic = ib = 0;
3481                         }
3482                         if(ib == 0) {
3483                                 ox = x;
3484                                 base = new;
3485                         }
3486
3487                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3488                         memcpy(buf+ib, new.c, sl);
3489                         ib += sl;
3490                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3491                 }
3492                 if(ib > 0)
3493                         xdraws(buf, base, ox, y, ic, ib);
3494         }
3495         xdrawcursor();
3496 }
3497
3498 void
3499 expose(XEvent *ev) {
3500         XExposeEvent *e = &ev->xexpose;
3501
3502         if(xw.state & WIN_REDRAW) {
3503                 if(!e->count)
3504                         xw.state &= ~WIN_REDRAW;
3505         }
3506         redraw(0);
3507 }
3508
3509 void
3510 visibility(XEvent *ev) {
3511         XVisibilityEvent *e = &ev->xvisibility;
3512
3513         if(e->state == VisibilityFullyObscured) {
3514                 xw.state &= ~WIN_VISIBLE;
3515         } else if(!(xw.state & WIN_VISIBLE)) {
3516                 /* need a full redraw for next Expose, not just a buf copy */
3517                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3518         }
3519 }
3520
3521 void
3522 unmap(XEvent *ev) {
3523         xw.state &= ~WIN_VISIBLE;
3524 }
3525
3526 void
3527 xsetpointermotion(int set) {
3528         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3529         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3530 }
3531
3532 void
3533 xseturgency(int add) {
3534         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3535
3536         MODBIT(h->flags, add, XUrgencyHint);
3537         XSetWMHints(xw.dpy, xw.win, h);
3538         XFree(h);
3539 }
3540
3541 void
3542 focus(XEvent *ev) {
3543         XFocusChangeEvent *e = &ev->xfocus;
3544
3545         if(e->mode == NotifyGrab)
3546                 return;
3547
3548         if(ev->type == FocusIn) {
3549                 XSetICFocus(xw.xic);
3550                 xw.state |= WIN_FOCUSED;
3551                 xseturgency(0);
3552                 if(IS_SET(MODE_FOCUS))
3553                         ttywrite("\033[I", 3);
3554         } else {
3555                 XUnsetICFocus(xw.xic);
3556                 xw.state &= ~WIN_FOCUSED;
3557                 if(IS_SET(MODE_FOCUS))
3558                         ttywrite("\033[O", 3);
3559         }
3560 }
3561
3562 static inline bool
3563 match(uint mask, uint state) {
3564         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3565 }
3566
3567 void
3568 numlock(const Arg *dummy) {
3569         term.numlock ^= 1;
3570 }
3571
3572 char*
3573 kmap(KeySym k, uint state) {
3574         Key *kp;
3575         int i;
3576
3577         /* Check for mapped keys out of X11 function keys. */
3578         for(i = 0; i < LEN(mappedkeys); i++) {
3579                 if(mappedkeys[i] == k)
3580                         break;
3581         }
3582         if(i == LEN(mappedkeys)) {
3583                 if((k & 0xFFFF) < 0xFD00)
3584                         return NULL;
3585         }
3586
3587         for(kp = key; kp < key + LEN(key); kp++) {
3588                 if(kp->k != k)
3589                         continue;
3590
3591                 if(!match(kp->mask, state))
3592                         continue;
3593
3594                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3595                         continue;
3596                 if(term.numlock && kp->appkey == 2)
3597                         continue;
3598
3599                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3600                         continue;
3601
3602                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3603                         continue;
3604
3605                 return kp->s;
3606         }
3607
3608         return NULL;
3609 }
3610
3611 void
3612 kpress(XEvent *ev) {
3613         XKeyEvent *e = &ev->xkey;
3614         KeySym ksym;
3615         char buf[32], *customkey;
3616         int len;
3617         long c;
3618         Status status;
3619         Shortcut *bp;
3620
3621         if(IS_SET(MODE_KBDLOCK))
3622                 return;
3623
3624         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3625         /* 1. shortcuts */
3626         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3627                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3628                         bp->func(&(bp->arg));
3629                         return;
3630                 }
3631         }
3632
3633         /* 2. custom keys from config.h */
3634         if((customkey = kmap(ksym, e->state))) {
3635                 ttysend(customkey, strlen(customkey));
3636                 return;
3637         }
3638
3639         /* 3. composed string from input method */
3640         if(len == 0)
3641                 return;
3642         if(len == 1 && e->state & Mod1Mask) {
3643                 if(IS_SET(MODE_8BIT)) {
3644                         if(*buf < 0177) {
3645                                 c = *buf | 0x80;
3646                                 len = utf8encode(c, buf, UTF_SIZ);
3647                         }
3648                 } else {
3649                         buf[1] = buf[0];
3650                         buf[0] = '\033';
3651                         len = 2;
3652                 }
3653         }
3654         ttysend(buf, len);
3655 }
3656
3657
3658 void
3659 cmessage(XEvent *e) {
3660         /*
3661          * See xembed specs
3662          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3663          */
3664         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3665                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3666                         xw.state |= WIN_FOCUSED;
3667                         xseturgency(0);
3668                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3669                         xw.state &= ~WIN_FOCUSED;
3670                 }
3671         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3672                 /* Send SIGHUP to shell */
3673                 kill(pid, SIGHUP);
3674                 exit(EXIT_SUCCESS);
3675         }
3676 }
3677
3678 void
3679 cresize(int width, int height) {
3680         int col, row;
3681
3682         if(width != 0)
3683                 xw.w = width;
3684         if(height != 0)
3685                 xw.h = height;
3686
3687         col = (xw.w - 2 * borderpx) / xw.cw;
3688         row = (xw.h - 2 * borderpx) / xw.ch;
3689
3690         tresize(col, row);
3691         xresize(col, row);
3692         ttyresize();
3693 }
3694
3695 void
3696 resize(XEvent *e) {
3697         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3698                 return;
3699
3700         cresize(e->xconfigure.width, e->xconfigure.height);
3701 }
3702
3703 void
3704 run(void) {
3705         XEvent ev;
3706         int w = xw.w, h = xw.h;
3707         fd_set rfd;
3708         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3709         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3710
3711         /* Waiting for window mapping */
3712         while(1) {
3713                 XNextEvent(xw.dpy, &ev);
3714                 if(ev.type == ConfigureNotify) {
3715                         w = ev.xconfigure.width;
3716                         h = ev.xconfigure.height;
3717                 } else if(ev.type == MapNotify) {
3718                         break;
3719                 }
3720         }
3721
3722         ttynew();
3723         cresize(w, h);
3724
3725         gettimeofday(&last, NULL);
3726         lastblink = last;
3727
3728         for(xev = actionfps;;) {
3729                 long deltatime;
3730
3731                 FD_ZERO(&rfd);
3732                 FD_SET(cmdfd, &rfd);
3733                 FD_SET(xfd, &rfd);
3734
3735                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3736                         if(errno == EINTR)
3737                                 continue;
3738                         die("select failed: %s\n", strerror(errno));
3739                 }
3740                 if(FD_ISSET(cmdfd, &rfd)) {
3741                         ttyread();
3742                         if(blinktimeout) {
3743                                 blinkset = tattrset(ATTR_BLINK);
3744                                 if(!blinkset)
3745                                         MODBIT(term.mode, 0, MODE_BLINK);
3746                         }
3747                 }
3748
3749                 if(FD_ISSET(xfd, &rfd))
3750                         xev = actionfps;
3751
3752                 gettimeofday(&now, NULL);
3753                 drawtimeout.tv_sec = 0;
3754                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3755                 tv = &drawtimeout;
3756
3757                 dodraw = 0;
3758                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3759                         tsetdirtattr(ATTR_BLINK);
3760                         term.mode ^= MODE_BLINK;
3761                         lastblink = now;
3762                         dodraw = 1;
3763                 }
3764                 deltatime = TIMEDIFF(now, last);
3765                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3766                                 || deltatime < 0) {
3767                         dodraw = 1;
3768                         last = now;
3769                 }
3770
3771                 if(dodraw) {
3772                         while(XPending(xw.dpy)) {
3773                                 XNextEvent(xw.dpy, &ev);
3774                                 if(XFilterEvent(&ev, None))
3775                                         continue;
3776                                 if(handler[ev.type])
3777                                         (handler[ev.type])(&ev);
3778                         }
3779
3780                         draw();
3781                         XFlush(xw.dpy);
3782
3783                         if(xev && !FD_ISSET(xfd, &rfd))
3784                                 xev--;
3785                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3786                                 if(blinkset) {
3787                                         if(TIMEDIFF(now, lastblink) \
3788                                                         > blinktimeout) {
3789                                                 drawtimeout.tv_usec = 1;
3790                                         } else {
3791                                                 drawtimeout.tv_usec = (1000 * \
3792                                                         (blinktimeout - \
3793                                                         TIMEDIFF(now,
3794                                                                 lastblink)));
3795                                         }
3796                                 } else {
3797                                         tv = NULL;
3798                                 }
3799                         }
3800                 }
3801         }
3802 }
3803
3804 void
3805 usage(void) {
3806         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3807         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3808         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3809 }
3810
3811 int
3812 main(int argc, char *argv[]) {
3813         char *titles;
3814         uint cols = 80, rows = 24;
3815
3816         xw.l = xw.t = 0;
3817         xw.isfixed = False;
3818
3819         ARGBEGIN {
3820         case 'a':
3821                 allowaltscreen = false;
3822                 break;
3823         case 'c':
3824                 opt_class = EARGF(usage());
3825                 break;
3826         case 'e':
3827                 /* eat all remaining arguments */
3828                 if(argc > 1) {
3829                         opt_cmd = &argv[1];
3830                         if(argv[1] != NULL && opt_title == NULL) {
3831                                 titles = xstrdup(argv[1]);
3832                                 opt_title = basename(titles);
3833                         }
3834                 }
3835                 goto run;
3836         case 'f':
3837                 opt_font = EARGF(usage());
3838                 break;
3839         case 'g':
3840                 xw.gm = XParseGeometry(EARGF(usage()),
3841                                 &xw.l, &xw.t, &cols, &rows);
3842                 break;
3843         case 'i':
3844                 xw.isfixed = True;
3845                 break;
3846         case 'o':
3847                 opt_io = EARGF(usage());
3848                 break;
3849         case 't':
3850                 opt_title = EARGF(usage());
3851                 break;
3852         case 'w':
3853                 opt_embed = EARGF(usage());
3854                 break;
3855         case 'v':
3856         default:
3857                 usage();
3858         } ARGEND;
3859
3860 run:
3861         setlocale(LC_CTYPE, "");
3862         XSetLocaleModifiers("");
3863         tnew(cols? cols : 1, rows? rows : 1);
3864         xinit();
3865         selinit();
3866         run();
3867
3868         return 0;
3869 }
3870