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_GFX       = 8,
  98         ATTR_ITALIC    = 16,
  99         ATTR_BLINK     = 32,
 100         ATTR_WRAP      = 64,
 101         ATTR_WIDE      = 128,
 102         ATTR_WDUMMY    = 256,
 103 };
 104
 105 enum cursor_movement {
 106         CURSOR_SAVE,
 107         CURSOR_LOAD
 108 };
 109
 110 enum cursor_state {
 111         CURSOR_DEFAULT  = 0,
 112         CURSOR_WRAPNEXT = 1,
 113         CURSOR_ORIGIN   = 2
 114 };
 115
 116 enum term_mode {
 117         MODE_WRAP        = 1,
 118         MODE_INSERT      = 2,
 119         MODE_APPKEYPAD   = 4,
 120         MODE_ALTSCREEN   = 8,
 121         MODE_CRLF        = 16,
 122         MODE_MOUSEBTN    = 32,
 123         MODE_MOUSEMOTION = 64,
 124         MODE_REVERSE     = 128,
 125         MODE_KBDLOCK     = 256,
 126         MODE_HIDE        = 512,
 127         MODE_ECHO        = 1024,
 128         MODE_APPCURSOR   = 2048,
 129         MODE_MOUSESGR    = 4096,
 130         MODE_8BIT        = 8192,
 131         MODE_BLINK       = 16384,
 132         MODE_FBLINK      = 32768,
 133         MODE_FOCUS       = 65536,
 134         MODE_MOUSEX10    = 131072,
 135         MODE_MOUSEMANY   = 262144,
 136         MODE_BRCKTPASTE  = 524288,
 137         MODE_PRINT       = 1048576,
 138         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 139                           |MODE_MOUSEMANY,
 140 };
 141
 142 enum charset {
 143         CS_GRAPHIC0,
 144         CS_GRAPHIC1,
 145         CS_UK,
 146         CS_USA,
 147         CS_MULTI,
 148         CS_GER,
 149         CS_FIN
 150 };
 151
 152 enum escape_state {
 153         ESC_START      = 1,
 154         ESC_CSI        = 2,
 155         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 156         ESC_ALTCHARSET = 8,
 157         ESC_STR_END    = 16, /* a final string was encountered */
 158         ESC_TEST       = 32, /* Enter in test mode */
 159 };
 160
 161 enum window_state {
 162         WIN_VISIBLE = 1,
 163         WIN_REDRAW  = 2,
 164         WIN_FOCUSED = 4
 165 };
 166
 167 enum selection_type {
 168         SEL_REGULAR = 1,
 169         SEL_RECTANGULAR = 2
 170 };
 171
 172 enum selection_snap {
 173         SNAP_WORD = 1,
 174         SNAP_LINE = 2
 175 };
 176
 177 typedef unsigned char uchar;
 178 typedef unsigned int uint;
 179 typedef unsigned long ulong;
 180 typedef unsigned short ushort;
 181
 182 typedef XftDraw *Draw;
 183 typedef XftColor Colour;
 184 typedef Colormap Colourmap;
 185
 186 typedef struct {
 187         char c[UTF_SIZ]; /* character code */
 188         ushort mode;      /* attribute flags */
 189         uint32_t fg;      /* foreground  */
 190         uint32_t bg;      /* background  */
 191 } Glyph;
 192
 193 typedef Glyph *Line;
 194
 195 typedef struct {
 196         Glyph attr; /* current char attributes */
 197         int x;
 198         int y;
 199         char state;
 200 } TCursor;
 201
 202 /* CSI Escape sequence structs */
 203 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 204 typedef struct {
 205         char buf[ESC_BUF_SIZ]; /* raw string */
 206         int len;               /* raw string length */
 207         char priv;
 208         int arg[ESC_ARG_SIZ];
 209         int narg;              /* nb of args */
 210         char mode;
 211 } CSIEscape;
 212
 213 /* STR Escape sequence structs */
 214 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 215 typedef struct {
 216         char type;             /* ESC type ... */
 217         char buf[STR_BUF_SIZ]; /* raw string */
 218         int len;               /* raw string length */
 219         char *args[STR_ARG_SIZ];
 220         int narg;              /* nb of args */
 221 } STREscape;
 222
 223 /* Internal representation of the screen */
 224 typedef struct {
 225         int row;      /* nb row */
 226         int col;      /* nb col */
 227         Line *line;   /* screen */
 228         Line *alt;    /* alternate screen */
 229         bool *dirty;  /* dirtyness of lines */
 230         TCursor c;    /* cursor */
 231         int top;      /* top    scroll limit */
 232         int bot;      /* bottom scroll limit */
 233         int mode;     /* terminal mode flags */
 234         int esc;      /* escape state flags */
 235         char trantbl[4]; /* charset table translation */
 236         int charset;  /* current charset */
 237         int icharset; /* selected charset for sequence */
 238         bool numlock; /* lock numbers in keyboard */
 239         bool *tabs;
 240 } Term;
 241
 242 /* Purely graphic info */
 243 typedef struct {
 244         Display *dpy;
 245         Colourmap cmap;
 246         Window win;
 247         Drawable buf;
 248         Atom xembed, wmdeletewin, netwmname, netwmpid;
 249         XIM xim;
 250         XIC xic;
 251         Draw draw;
 252         Visual *vis;
 253         XSetWindowAttributes attrs;
 254         int scr;
 255         bool isfixed; /* is fixed geometry? */
 256         int l, t; /* left and top offset */
 257         int gm; /* geometry mask */
 258         int tw, th; /* tty width and height */
 259         int w, h; /* window width and height */
 260         int ch; /* char height */
 261         int cw; /* char width  */
 262         char state; /* focus, redraw, visible */
 263 } XWindow;
 264
 265 typedef struct {
 266         uint b;
 267         uint mask;
 268         char *s;
 269 } Mousekey;
 270
 271 typedef struct {
 272         KeySym k;
 273         uint mask;
 274         char *s;
 275         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 276         signed char appkey;    /* application keypad */
 277         signed char appcursor; /* application cursor */
 278         signed char crlf;      /* crlf mode          */
 279 } Key;
 280
 281 typedef struct {
 282         int mode;
 283         int type;
 284         int snap;
 285         /*
 286          * Selection variables:
 287          * nb – normalized coordinates of the beginning of the selection
 288          * ne – normalized coordinates of the end of the selection
 289          * ob – original coordinates of the beginning of the selection
 290          * oe – original coordinates of the end of the selection
 291          */
 292         struct {
 293                 int x, y;
 294         } nb, ne, ob, oe;
 295
 296         char *clip;
 297         Atom xtarget;
 298         bool alt;
 299         struct timeval tclick1;
 300         struct timeval tclick2;
 301 } Selection;
 302
 303 typedef union {
 304         int i;
 305         uint ui;
 306         float f;
 307         const void *v;
 308 } Arg;
 309
 310 typedef struct {
 311         uint mod;
 312         KeySym keysym;
 313         void (*func)(const Arg *);
 314         const Arg arg;
 315 } Shortcut;
 316
 317 /* function definitions used in config.h */
 318 static void clippaste(const Arg *);
 319 static void numlock(const Arg *);
 320 static void selpaste(const Arg *);
 321 static void xzoom(const Arg *);
 322 static void printsel(const Arg *);
 323 static void printscreen(const Arg *) ;
 324 static void toggleprinter(const Arg *);
 325
 326 /* Config.h for applying patches and the configuration. */
 327 #include "config.h"
 328
 329 /* Font structure */
 330 typedef struct {
 331         int height;
 332         int width;
 333         int ascent;
 334         int descent;
 335         short lbearing;
 336         short rbearing;
 337         XftFont *match;
 338         FcFontSet *set;
 339         FcPattern *pattern;
 340 } Font;
 341
 342 /* Drawing Context */
 343 typedef struct {
 344         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 345         Font font, bfont, ifont, ibfont;
 346         GC gc;
 347 } DC;
 348
 349 static void die(const char *, ...);
 350 static void draw(void);
 351 static void redraw(int);
 352 static void drawregion(int, int, int, int);
 353 static void execsh(void);
 354 static void sigchld(int);
 355 static void run(void);
 356
 357 static void csidump(void);
 358 static void csihandle(void);
 359 static void csiparse(void);
 360 static void csireset(void);
 361 static void strdump(void);
 362 static void strhandle(void);
 363 static void strparse(void);
 364 static void strreset(void);
 365
 366 static int tattrset(int);
 367 static void tprinter(char *, size_t);
 368 static void tdumpsel(void);
 369 static void tdumpline(int);
 370 static void tdump(void);
 371 static void tclearregion(int, int, int, int);
 372 static void tcursor(int);
 373 static void tdeletechar(int);
 374 static void tdeleteline(int);
 375 static void tinsertblank(int);
 376 static void tinsertblankline(int);
 377 static void tmoveto(int, int);
 378 static void tmoveato(int, int);
 379 static void tnew(int, int);
 380 static void tnewline(int);
 381 static void tputtab(int);
 382 static void tputc(char *, int);
 383 static void treset(void);
 384 static int tresize(int, int);
 385 static void tscrollup(int, int);
 386 static void tscrolldown(int, int);
 387 static void tsetattr(int *, int);
 388 static void tsetchar(char *, Glyph *, int, int);
 389 static void tsetscroll(int, int);
 390 static void tswapscreen(void);
 391 static void tsetdirt(int, int);
 392 static void tsetdirtattr(int);
 393 static void tsetmode(bool, bool, int *, int);
 394 static void tfulldirt(void);
 395 static void techo(char *, int);
 396 static bool tcontrolcode(uchar );
 397 static void tdectest(char );
 398 static int32_t tdefcolor(int *, int *, int);
 399 static void tselcs(void);
 400 static void tdeftran(char);
 401 static inline bool match(uint, uint);
 402 static void ttynew(void);
 403 static void ttyread(void);
 404 static void ttyresize(void);
 405 static void ttysend(char *, size_t);
 406 static void ttywrite(const char *, size_t);
 407
 408 static void xdraws(char *, Glyph, int, int, int, int);
 409 static void xhints(void);
 410 static void xclear(int, int, int, int);
 411 static void xdrawcursor(void);
 412 static void xinit(void);
 413 static void xloadcols(void);
 414 static int xsetcolorname(int, const char *);
 415 static int xgeommasktogravity(int);
 416 static int xloadfont(Font *, FcPattern *);
 417 static void xloadfonts(char *, double);
 418 static int xloadfontset(Font *);
 419 static void xsettitle(char *);
 420 static void xresettitle(void);
 421 static void xsetpointermotion(int);
 422 static void xseturgency(int);
 423 static void xsetsel(char *);
 424 static void xtermclear(int, int, int, int);
 425 static void xunloadfont(Font *);
 426 static void xunloadfonts(void);
 427 static void xresize(int, int);
 428
 429 static void expose(XEvent *);
 430 static void visibility(XEvent *);
 431 static void unmap(XEvent *);
 432 static char *kmap(KeySym, uint);
 433 static void kpress(XEvent *);
 434 static void cmessage(XEvent *);
 435 static void cresize(int, int);
 436 static void resize(XEvent *);
 437 static void focus(XEvent *);
 438 static void brelease(XEvent *);
 439 static void bpress(XEvent *);
 440 static void bmotion(XEvent *);
 441 static void selnotify(XEvent *);
 442 static void selclear(XEvent *);
 443 static void selrequest(XEvent *);
 444
 445 static void selinit(void);
 446 static void selsort(void);
 447 static inline bool selected(int, int);
 448 static char *getsel(void);
 449 static void selcopy(void);
 450 static void selscroll(int, int);
 451 static void selsnap(int, int *, int *, int);
 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 (*handler[LASTEvent])(XEvent *) = {
 466         [KeyPress] = kpress,
 467         [ClientMessage] = cmessage,
 468         [ConfigureNotify] = resize,
 469         [VisibilityNotify] = visibility,
 470         [UnmapNotify] = unmap,
 471         [Expose] = expose,
 472         [FocusIn] = focus,
 473         [FocusOut] = focus,
 474         [MotionNotify] = bmotion,
 475         [ButtonPress] = bpress,
 476         [ButtonRelease] = brelease,
 477         [SelectionClear] = selclear,
 478         [SelectionNotify] = selnotify,
 479         [SelectionRequest] = selrequest,
 480 };
 481
 482 /* Globals */
 483 static DC dc;
 484 static XWindow xw;
 485 static Term term;
 486 static CSIEscape csiescseq;
 487 static STREscape strescseq;
 488 static int cmdfd;
 489 static pid_t pid;
 490 static Selection sel;
 491 static int iofd = STDOUT_FILENO;
 492 static char **opt_cmd = NULL;
 493 static char *opt_io = NULL;
 494 static char *opt_title = NULL;
 495 static char *opt_embed = NULL;
 496 static char *opt_class = NULL;
 497 static char *opt_font = NULL;
 498 static int oldbutton = 3; /* button event on startup: 3 = release */
 499
 500 static char *usedfont = NULL;
 501 static double usedfontsize = 0;
 502
 503 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 504 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 505 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 506 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 507
 508 /* Font Ring Cache */
 509 enum {
 510         FRC_NORMAL,
 511         FRC_ITALIC,
 512         FRC_BOLD,
 513         FRC_ITALICBOLD
 514 };
 515
 516 typedef struct {
 517         XftFont *font;
 518         int flags;
 519 } Fontcache;
 520
 521 /* Fontcache is an array now. A new font will be appended to the array. */
 522 static Fontcache frc[16];
 523 static int frclen = 0;
 524
 525 ssize_t
 526 xwrite(int fd, const char *s, size_t len) {
 527         size_t aux = len;
 528
 529         while(len > 0) {
 530                 ssize_t r = write(fd, s, len);
 531                 if(r < 0)
 532                         return r;
 533                 len -= r;
 534                 s += r;
 535         }
 536         return aux;
 537 }
 538
 539 void *
 540 xmalloc(size_t len) {
 541         void *p = malloc(len);
 542
 543         if(!p)
 544                 die("Out of memory\n");
 545
 546         return p;
 547 }
 548
 549 void *
 550 xrealloc(void *p, size_t len) {
 551         if((p = realloc(p, len)) == NULL)
 552                 die("Out of memory\n");
 553
 554         return p;
 555 }
 556
 557 char *
 558 xstrdup(char *s) {
 559         if((s = strdup(s)) == NULL)
 560                 die("Out of memory\n");
 561
 562         return s;
 563 }
 564
 565 size_t
 566 utf8decode(char *c, long *u, size_t clen) {
 567         size_t i, j, len, type;
 568         long udecoded;
 569
 570         *u = UTF_INVALID;
 571         if(!clen)
 572                 return 0;
 573         udecoded = utf8decodebyte(c[0], &len);
 574         if(!BETWEEN(len, 1, UTF_SIZ))
 575                 return 1;
 576         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 577                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 578                 if(type != 0)
 579                         return j;
 580         }
 581         if(j < len)
 582                 return 0;
 583         *u = udecoded;
 584         utf8validate(u, len);
 585         return len;
 586 }
 587
 588 long
 589 utf8decodebyte(char c, size_t *i) {
 590         for(*i = 0; *i < LEN(utfmask); ++(*i))
 591                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 592                         return (uchar)c & ~utfmask[*i];
 593         return 0;
 594 }
 595
 596 size_t
 597 utf8encode(long u, char *c, size_t clen) {
 598         size_t len, i;
 599
 600         len = utf8validate(&u, 0);
 601         if(clen < len)
 602                 return 0;
 603         for(i = len - 1; i != 0; --i) {
 604                 c[i] = utf8encodebyte(u, 0);
 605                 u >>= 6;
 606         }
 607         c[0] = utf8encodebyte(u, len);
 608         return len;
 609 }
 610
 611 char
 612 utf8encodebyte(long u, size_t i) {
 613         return utfbyte[i] | (u & ~utfmask[i]);
 614 }
 615
 616 size_t
 617 utf8len(char *c) {
 618         return utf8decode(c, &(long){0}, UTF_SIZ);
 619 }
 620
 621 size_t
 622 utf8validate(long *u, size_t i) {
 623         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 624                 *u = UTF_INVALID;
 625         for(i = 1; *u > utfmax[i]; ++i)
 626                 ;
 627         return i;
 628 }
 629
 630 static void
 631 selinit(void) {
 632         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 633         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 634         sel.mode = 0;
 635         sel.ob.x = -1;
 636         sel.clip = NULL;
 637         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 638         if(sel.xtarget == None)
 639                 sel.xtarget = XA_STRING;
 640 }
 641
 642 static int
 643 x2col(int x) {
 644         x -= borderpx;
 645         x /= xw.cw;
 646
 647         return LIMIT(x, 0, term.col-1);
 648 }
 649
 650 static int
 651 y2row(int y) {
 652         y -= borderpx;
 653         y /= xw.ch;
 654
 655         return LIMIT(y, 0, term.row-1);
 656 }
 657
 658 static void
 659 selsort(void) {
 660         if(sel.ob.y == sel.oe.y) {
 661                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 662                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 663         } else {
 664                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 665                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 666         }
 667         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 668         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 669 }
 670
 671 static inline bool
 672 selected(int x, int y) {
 673         if(sel.ne.y == y && sel.nb.y == y)
 674                 return BETWEEN(x, sel.nb.x, sel.ne.x);
 675
 676         if(sel.type == SEL_RECTANGULAR) {
 677                 return ((sel.nb.y <= y && y <= sel.ne.y)
 678                         && (sel.nb.x <= x && x <= sel.ne.x));
 679         }
 680
 681         return ((sel.nb.y < y && y < sel.ne.y)
 682                 || (y == sel.ne.y && x <= sel.ne.x))
 683                 || (y == sel.nb.y && x >= sel.nb.x
 684                         && (x <= sel.ne.x || sel.nb.y != sel.ne.y));
 685 }
 686
 687 void
 688 selsnap(int mode, int *x, int *y, int direction) {
 689         int i;
 690
 691         switch(mode) {
 692         case SNAP_WORD:
 693                 /*
 694                  * Snap around if the word wraps around at the end or
 695                  * beginning of a line.
 696                  */
 697                 for(;;) {
 698                         if(direction < 0 && *x <= 0) {
 699                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 700                                                 & ATTR_WRAP) {
 701                                         *y -= 1;
 702                                         *x = term.col-1;
 703                                 } else {
 704                                         break;
 705                                 }
 706                         }
 707                         if(direction > 0 && *x >= term.col-1) {
 708                                 if(*y < term.row-1 && term.line[*y][*x].mode
 709                                                 & ATTR_WRAP) {
 710                                         *y += 1;
 711                                         *x = 0;
 712                                 } else {
 713                                         break;
 714                                 }
 715                         }
 716
 717                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 718                                 *x += direction;
 719                                 continue;
 720                         }
 721
 722                         if(strchr(worddelimiters,
 723                                         term.line[*y][*x+direction].c[0])) {
 724                                 break;
 725                         }
 726
 727                         *x += direction;
 728                 }
 729                 break;
 730         case SNAP_LINE:
 731                 /*
 732                  * Snap around if the the previous line or the current one
 733                  * has set ATTR_WRAP at its end. Then the whole next or
 734                  * previous line will be selected.
 735                  */
 736                 *x = (direction < 0) ? 0 : term.col - 1;
 737                 if(direction < 0 && *y > 0) {
 738                         for(; *y > 0; *y += direction) {
 739                                 if(!(term.line[*y-1][term.col-1].mode
 740                                                 & ATTR_WRAP)) {
 741                                         break;
 742                                 }
 743                         }
 744                 } else if(direction > 0 && *y < term.row-1) {
 745                         for(; *y < term.row; *y += direction) {
 746                                 if(!(term.line[*y][term.col-1].mode
 747                                                 & ATTR_WRAP)) {
 748                                         break;
 749                                 }
 750                         }
 751                 }
 752                 break;
 753         default:
 754                 /*
 755                  * Select the whole line when the end of line is reached.
 756                  */
 757                 if(direction > 0) {
 758                         i = term.col;
 759                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 760                                 /* nothing */;
 761                         if(i > 0 && i < *x)
 762                                 *x = term.col - 1;
 763                 }
 764                 break;
 765         }
 766 }
 767
 768 void
 769 getbuttoninfo(XEvent *e) {
 770         int type;
 771         uint state = e->xbutton.state &~Button1Mask;
 772
 773         sel.alt = IS_SET(MODE_ALTSCREEN);
 774
 775         sel.oe.x = x2col(e->xbutton.x);
 776         sel.oe.y = y2row(e->xbutton.y);
 777
 778         if(sel.ob.y < sel.oe.y
 779                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 780                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 781                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 782         } else {
 783                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 784                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 785         }
 786         selsort();
 787
 788         sel.type = SEL_REGULAR;
 789         for(type = 1; type < LEN(selmasks); ++type) {
 790                 if(match(selmasks[type], state)) {
 791                         sel.type = type;
 792                         break;
 793                 }
 794         }
 795 }
 796
 797 void
 798 mousereport(XEvent *e) {
 799         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 800             button = e->xbutton.button, state = e->xbutton.state,
 801             len;
 802         char buf[40];
 803         static int ox, oy;
 804
 805         /* from urxvt */
 806         if(e->xbutton.type == MotionNotify) {
 807                 if(x == ox && y == oy)
 808                         return;
 809                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 810                         return;
 811                 /* MOUSE_MOTION: no reporting if no button is pressed */
 812                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 813                         return;
 814
 815                 button = oldbutton + 32;
 816                 ox = x;
 817                 oy = y;
 818         } else {
 819                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 820                         button = 3;
 821                 } else {
 822                         button -= Button1;
 823                         if(button >= 3)
 824                                 button += 64 - 3;
 825                 }
 826                 if(e->xbutton.type == ButtonPress) {
 827                         oldbutton = button;
 828                         ox = x;
 829                         oy = y;
 830                 } else if(e->xbutton.type == ButtonRelease) {
 831                         oldbutton = 3;
 832                         /* MODE_MOUSEX10: no button release reporting */
 833                         if(IS_SET(MODE_MOUSEX10))
 834                                 return;
 835                 }
 836         }
 837
 838         if(!IS_SET(MODE_MOUSEX10)) {
 839                 button += (state & ShiftMask   ? 4  : 0)
 840                         + (state & Mod4Mask    ? 8  : 0)
 841                         + (state & ControlMask ? 16 : 0);
 842         }
 843
 844         len = 0;
 845         if(IS_SET(MODE_MOUSESGR)) {
 846                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 847                                 button, x+1, y+1,
 848                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 849         } else if(x < 223 && y < 223) {
 850                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 851                                 32+button, 32+x+1, 32+y+1);
 852         } else {
 853                 return;
 854         }
 855
 856         ttywrite(buf, len);
 857 }
 858
 859 void
 860 bpress(XEvent *e) {
 861         struct timeval now;
 862         Mousekey *mk;
 863
 864         if(IS_SET(MODE_MOUSE)) {
 865                 mousereport(e);
 866                 return;
 867         }
 868
 869         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 870                 if(e->xbutton.button == mk->b
 871                                 && match(mk->mask, e->xbutton.state)) {
 872                         ttysend(mk->s, strlen(mk->s));
 873                         return;
 874                 }
 875         }
 876
 877         if(e->xbutton.button == Button1) {
 878                 gettimeofday(&now, NULL);
 879
 880                 /* Clear previous selection, logically and visually. */
 881                 selclear(NULL);
 882                 sel.mode = 1;
 883                 sel.type = SEL_REGULAR;
 884                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 885                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 886
 887                 /*
 888                  * If the user clicks below predefined timeouts specific
 889                  * snapping behaviour is exposed.
 890                  */
 891                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 892                         sel.snap = SNAP_LINE;
 893                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 894                         sel.snap = SNAP_WORD;
 895                 } else {
 896                         sel.snap = 0;
 897                 }
 898                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 899                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 900                 selsort();
 901
 902                 /*
 903                  * Draw selection, unless it's regular and we don't want to
 904                  * make clicks visible
 905                  */
 906                 if(sel.snap != 0) {
 907                         sel.mode++;
 908                         tsetdirt(sel.nb.y, sel.ne.y);
 909                 }
 910                 sel.tclick2 = sel.tclick1;
 911                 sel.tclick1 = now;
 912         }
 913 }
 914
 915 char *
 916 getsel(void) {
 917         char *str, *ptr;
 918         int x, y, bufsize, size, i, ex;
 919         Glyph *gp, *last;
 920
 921         if(sel.ob.x == -1) {
 922                 str = NULL;
 923         } else {
 924                 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 925                 ptr = str = xmalloc(bufsize);
 926
 927                 /* append every set & selected glyph to the selection */
 928                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 929                         gp = &term.line[y][0];
 930                         last = &gp[term.col-1];
 931
 932                         while(last >= gp && !(selected(last - gp, y) &&
 933                                               strcmp(last->c, " ") != 0)) {
 934                                 --last;
 935                         }
 936
 937                         for(x = 0; gp <= last; x++, ++gp) {
 938                                 if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 939                                         continue;
 940
 941                                 size = utf8len(gp->c);
 942                                 memcpy(ptr, gp->c, size);
 943                                 ptr += size;
 944                         }
 945
 946                         /*
 947                          * Copy and pasting of line endings is inconsistent
 948                          * in the inconsistent terminal and GUI world.
 949                          * The best solution seems like to produce '\n' when
 950                          * something is copied from st and convert '\n' to
 951                          * '\r', when something to be pasted is received by
 952                          * st.
 953                          * FIXME: Fix the computer world.
 954                          */
 955                         if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
 956                                 *ptr++ = '\n';
 957
 958                         /*
 959                          * If the last selected line expands in the selection
 960                          * after the visible text '\n' is appended.
 961                          */
 962                         if(y == sel.ne.y) {
 963                                 i = term.col;
 964                                 while(--i > 0 && term.line[y][i].c[0] == ' ')
 965                                         /* nothing */;
 966                                 ex = sel.ne.x;
 967                                 if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 968                                         ex = sel.nb.x;
 969                                 if(i < ex)
 970                                         *ptr++ = '\n';
 971                         }
 972                 }
 973                 *ptr = 0;
 974         }
 975         return str;
 976 }
 977
 978 void
 979 selcopy(void) {
 980         xsetsel(getsel());
 981 }
 982
 983 void
 984 selnotify(XEvent *e) {
 985         ulong nitems, ofs, rem;
 986         int format;
 987         uchar *data, *last, *repl;
 988         Atom type;
 989
 990         ofs = 0;
 991         do {
 992                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 993                                         False, AnyPropertyType, &type, &format,
 994                                         &nitems, &rem, &data)) {
 995                         fprintf(stderr, "Clipboard allocation failed\n");
 996                         return;
 997                 }
 998
 999                 /*
1000                  * As seen in getsel:
1001                  * Line endings are inconsistent in the terminal and GUI world
1002                  * copy and pasting. When receiving some selection data,
1003                  * replace all '\n' with '\r'.
1004                  * FIXME: Fix the computer world.
1005                  */
1006                 repl = data;
1007                 last = data + nitems * format / 8;
1008                 while((repl = memchr(repl, '\n', last - repl))) {
1009                         *repl++ = '\r';
1010                 }
1011
1012                 if(IS_SET(MODE_BRCKTPASTE))
1013                         ttywrite("\033[200~", 6);
1014                 ttysend((char *)data, nitems * format / 8);
1015                 if(IS_SET(MODE_BRCKTPASTE))
1016                         ttywrite("\033[201~", 6);
1017                 XFree(data);
1018                 /* number of 32-bit chunks returned */
1019                 ofs += nitems * format / 32;
1020         } while(rem > 0);
1021 }
1022
1023 void
1024 selpaste(const Arg *dummy) {
1025         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1026                         xw.win, CurrentTime);
1027 }
1028
1029 void
1030 clippaste(const Arg *dummy) {
1031         Atom clipboard;
1032
1033         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1034         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1035                         xw.win, CurrentTime);
1036 }
1037
1038 void
1039 selclear(XEvent *e) {
1040         if(sel.ob.x == -1)
1041                 return;
1042         sel.ob.x = -1;
1043         tsetdirt(sel.nb.y, sel.ne.y);
1044 }
1045
1046 void
1047 selrequest(XEvent *e) {
1048         XSelectionRequestEvent *xsre;
1049         XSelectionEvent xev;
1050         Atom xa_targets, string;
1051
1052         xsre = (XSelectionRequestEvent *) e;
1053         xev.type = SelectionNotify;
1054         xev.requestor = xsre->requestor;
1055         xev.selection = xsre->selection;
1056         xev.target = xsre->target;
1057         xev.time = xsre->time;
1058         /* reject */
1059         xev.property = None;
1060
1061         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1062         if(xsre->target == xa_targets) {
1063                 /* respond with the supported type */
1064                 string = sel.xtarget;
1065                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1066                                 XA_ATOM, 32, PropModeReplace,
1067                                 (uchar *) &string, 1);
1068                 xev.property = xsre->property;
1069         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1070                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1071                                 xsre->target, 8, PropModeReplace,
1072                                 (uchar *) sel.clip, strlen(sel.clip));
1073                 xev.property = xsre->property;
1074         }
1075
1076         /* all done, send a notification to the listener */
1077         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1078                 fprintf(stderr, "Error sending SelectionNotify event\n");
1079 }
1080
1081 void
1082 xsetsel(char *str) {
1083         /* register the selection for both the clipboard and the primary */
1084         Atom clipboard;
1085
1086         free(sel.clip);
1087         sel.clip = str;
1088
1089         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1090
1091         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1092         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1093 }
1094
1095 void
1096 brelease(XEvent *e) {
1097         if(IS_SET(MODE_MOUSE)) {
1098                 mousereport(e);
1099                 return;
1100         }
1101
1102         if(e->xbutton.button == Button2) {
1103                 selpaste(NULL);
1104         } else if(e->xbutton.button == Button1) {
1105                 if(sel.mode < 2) {
1106                         selclear(NULL);
1107                 } else {
1108                         getbuttoninfo(e);
1109                         selcopy();
1110                 }
1111                 sel.mode = 0;
1112                 tsetdirt(sel.nb.y, sel.ne.y);
1113         }
1114 }
1115
1116 void
1117 bmotion(XEvent *e) {
1118         int oldey, oldex, oldsby, oldsey;
1119
1120         if(IS_SET(MODE_MOUSE)) {
1121                 mousereport(e);
1122                 return;
1123         }
1124
1125         if(!sel.mode)
1126                 return;
1127
1128         sel.mode++;
1129         oldey = sel.oe.y;
1130         oldex = sel.oe.x;
1131         oldsby = sel.nb.y;
1132         oldsey = sel.ne.y;
1133         getbuttoninfo(e);
1134
1135         if(oldey != sel.oe.y || oldex != sel.oe.x)
1136                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1137 }
1138
1139 void
1140 die(const char *errstr, ...) {
1141         va_list ap;
1142
1143         va_start(ap, errstr);
1144         vfprintf(stderr, errstr, ap);
1145         va_end(ap);
1146         exit(EXIT_FAILURE);
1147 }
1148
1149 void
1150 execsh(void) {
1151         char **args;
1152         char *envshell = getenv("SHELL");
1153         const struct passwd *pass = getpwuid(getuid());
1154         char buf[sizeof(long) * 8 + 1];
1155
1156         unsetenv("COLUMNS");
1157         unsetenv("LINES");
1158         unsetenv("TERMCAP");
1159
1160         if(pass) {
1161                 setenv("LOGNAME", pass->pw_name, 1);
1162                 setenv("USER", pass->pw_name, 1);
1163                 setenv("SHELL", pass->pw_shell, 0);
1164                 setenv("HOME", pass->pw_dir, 0);
1165         }
1166
1167         snprintf(buf, sizeof(buf), "%lu", xw.win);
1168         setenv("WINDOWID", buf, 1);
1169
1170         signal(SIGCHLD, SIG_DFL);
1171         signal(SIGHUP, SIG_DFL);
1172         signal(SIGINT, SIG_DFL);
1173         signal(SIGQUIT, SIG_DFL);
1174         signal(SIGTERM, SIG_DFL);
1175         signal(SIGALRM, SIG_DFL);
1176
1177         DEFAULT(envshell, shell);
1178         setenv("TERM", termname, 1);
1179         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1180         execvp(args[0], args);
1181         exit(EXIT_FAILURE);
1182 }
1183
1184 void
1185 sigchld(int a) {
1186         int stat = 0;
1187
1188         if(waitpid(pid, &stat, 0) < 0)
1189                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1190
1191         if(WIFEXITED(stat)) {
1192                 exit(WEXITSTATUS(stat));
1193         } else {
1194                 exit(EXIT_FAILURE);
1195         }
1196 }
1197
1198 void
1199 ttynew(void) {
1200         int m, s;
1201         struct winsize w = {term.row, term.col, 0, 0};
1202
1203         /* seems to work fine on linux, openbsd and freebsd */
1204         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1205                 die("openpty failed: %s\n", strerror(errno));
1206
1207         switch(pid = fork()) {
1208         case -1:
1209                 die("fork failed\n");
1210                 break;
1211         case 0:
1212                 setsid(); /* create a new process group */
1213                 dup2(s, STDIN_FILENO);
1214                 dup2(s, STDOUT_FILENO);
1215                 dup2(s, STDERR_FILENO);
1216                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1217                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1218                 close(s);
1219                 close(m);
1220                 execsh();
1221                 break;
1222         default:
1223                 close(s);
1224                 cmdfd = m;
1225                 signal(SIGCHLD, sigchld);
1226                 if(opt_io) {
1227                         term.mode |= MODE_PRINT;
1228                         iofd = (!strcmp(opt_io, "-")) ?
1229                                   STDOUT_FILENO :
1230                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1231                         if(iofd < 0) {
1232                                 fprintf(stderr, "Error opening %s:%s\n",
1233                                         opt_io, strerror(errno));
1234                         }
1235                 }
1236                 break;
1237         }
1238 }
1239
1240 void
1241 dump(char c) {
1242         static int col;
1243
1244         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1245         if(++col % 10 == 0)
1246                 fprintf(stderr, "\n");
1247 }
1248
1249 void
1250 ttyread(void) {
1251         static char buf[BUFSIZ];
1252         static int buflen = 0;
1253         char *ptr;
1254         char s[UTF_SIZ];
1255         int charsize; /* size of utf8 char in bytes */
1256         long unicodep;
1257         int ret;
1258
1259         /* append read bytes to unprocessed bytes */
1260         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1261                 die("Couldn't read from shell: %s\n", strerror(errno));
1262
1263         /* process every complete utf8 char */
1264         buflen += ret;
1265         ptr = buf;
1266         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1267                 utf8encode(unicodep, s, UTF_SIZ);
1268                 tputc(s, charsize);
1269                 ptr += charsize;
1270                 buflen -= charsize;
1271         }
1272
1273         /* keep any uncomplete utf8 char for the next call */
1274         memmove(buf, ptr, buflen);
1275 }
1276
1277 void
1278 ttywrite(const char *s, size_t n) {
1279         if(xwrite(cmdfd, s, n) == -1)
1280                 die("write error on tty: %s\n", strerror(errno));
1281 }
1282
1283 void
1284 ttysend(char *s, size_t n) {
1285         ttywrite(s, n);
1286         if(IS_SET(MODE_ECHO))
1287                 techo(s, n);
1288 }
1289
1290 void
1291 ttyresize(void) {
1292         struct winsize w;
1293
1294         w.ws_row = term.row;
1295         w.ws_col = term.col;
1296         w.ws_xpixel = xw.tw;
1297         w.ws_ypixel = xw.th;
1298         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1299                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1300 }
1301
1302 int
1303 tattrset(int attr) {
1304         int i, j;
1305
1306         for(i = 0; i < term.row-1; i++) {
1307                 for(j = 0; j < term.col-1; j++) {
1308                         if(term.line[i][j].mode & attr)
1309                                 return 1;
1310                 }
1311         }
1312
1313         return 0;
1314 }
1315
1316 void
1317 tsetdirt(int top, int bot) {
1318         int i;
1319
1320         LIMIT(top, 0, term.row-1);
1321         LIMIT(bot, 0, term.row-1);
1322
1323         for(i = top; i <= bot; i++)
1324                 term.dirty[i] = 1;
1325 }
1326
1327 void
1328 tsetdirtattr(int attr) {
1329         int i, j;
1330
1331         for(i = 0; i < term.row-1; i++) {
1332                 for(j = 0; j < term.col-1; j++) {
1333                         if(term.line[i][j].mode & attr) {
1334                                 tsetdirt(i, i);
1335                                 break;
1336                         }
1337                 }
1338         }
1339 }
1340
1341 void
1342 tfulldirt(void) {
1343         tsetdirt(0, term.row-1);
1344 }
1345
1346 void
1347 tcursor(int mode) {
1348         static TCursor c[2];
1349         bool alt = IS_SET(MODE_ALTSCREEN);
1350
1351         if(mode == CURSOR_SAVE) {
1352                 c[alt] = term.c;
1353         } else if(mode == CURSOR_LOAD) {
1354                 term.c = c[alt];
1355                 tmoveto(c[alt].x, c[alt].y);
1356         }
1357 }
1358
1359 void
1360 treset(void) {
1361         uint i;
1362
1363         term.c = (TCursor){{
1364                 .mode = ATTR_NULL,
1365                 .fg = defaultfg,
1366                 .bg = defaultbg
1367         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1368
1369         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1370         for(i = tabspaces; i < term.col; i += tabspaces)
1371                 term.tabs[i] = 1;
1372         term.top = 0;
1373         term.bot = term.row - 1;
1374         term.mode = MODE_WRAP;
1375         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1376         term.charset = 0;
1377
1378         tclearregion(0, 0, term.col-1, term.row-1);
1379         tmoveto(0, 0);
1380         tcursor(CURSOR_SAVE);
1381 }
1382
1383 void
1384 tnew(int col, int row) {
1385         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1386         tresize(col, row);
1387         term.numlock = 1;
1388
1389         treset();
1390 }
1391
1392 void
1393 tswapscreen(void) {
1394         Line *tmp = term.line;
1395
1396         term.line = term.alt;
1397         term.alt = tmp;
1398         term.mode ^= MODE_ALTSCREEN;
1399         tfulldirt();
1400 }
1401
1402 void
1403 tscrolldown(int orig, int n) {
1404         int i;
1405         Line temp;
1406
1407         LIMIT(n, 0, term.bot-orig+1);
1408
1409         tsetdirt(orig, term.bot-n);
1410         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1411
1412         for(i = term.bot; i >= orig+n; i--) {
1413                 temp = term.line[i];
1414                 term.line[i] = term.line[i-n];
1415                 term.line[i-n] = temp;
1416         }
1417
1418         selscroll(orig, n);
1419 }
1420
1421 void
1422 tscrollup(int orig, int n) {
1423         int i;
1424         Line temp;
1425
1426         LIMIT(n, 0, term.bot-orig+1);
1427
1428         tclearregion(0, orig, term.col-1, orig+n-1);
1429         tsetdirt(orig+n, term.bot);
1430
1431         for(i = orig; i <= term.bot-n; i++) {
1432                 temp = term.line[i];
1433                 term.line[i] = term.line[i+n];
1434                 term.line[i+n] = temp;
1435         }
1436
1437         selscroll(orig, -n);
1438 }
1439
1440 void
1441 selscroll(int orig, int n) {
1442         if(sel.ob.x == -1)
1443                 return;
1444
1445         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1446                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1447                         selclear(NULL);
1448                         return;
1449                 }
1450                 if(sel.type == SEL_RECTANGULAR) {
1451                         if(sel.ob.y < term.top)
1452                                 sel.ob.y = term.top;
1453                         if(sel.oe.y > term.bot)
1454                                 sel.oe.y = term.bot;
1455                 } else {
1456                         if(sel.ob.y < term.top) {
1457                                 sel.ob.y = term.top;
1458                                 sel.ob.x = 0;
1459                         }
1460                         if(sel.oe.y > term.bot) {
1461                                 sel.oe.y = term.bot;
1462                                 sel.oe.x = term.col;
1463                         }
1464                 }
1465                 selsort();
1466         }
1467 }
1468
1469 void
1470 tnewline(int first_col) {
1471         int y = term.c.y;
1472
1473         if(y == term.bot) {
1474                 tscrollup(term.top, 1);
1475         } else {
1476                 y++;
1477         }
1478         tmoveto(first_col ? 0 : term.c.x, y);
1479 }
1480
1481 void
1482 csiparse(void) {
1483         char *p = csiescseq.buf, *np;
1484         long int v;
1485
1486         csiescseq.narg = 0;
1487         if(*p == '?') {
1488                 csiescseq.priv = 1;
1489                 p++;
1490         }
1491
1492         csiescseq.buf[csiescseq.len] = '\0';
1493         while(p < csiescseq.buf+csiescseq.len) {
1494                 np = NULL;
1495                 v = strtol(p, &np, 10);
1496                 if(np == p)
1497                         v = 0;
1498                 if(v == LONG_MAX || v == LONG_MIN)
1499                         v = -1;
1500                 csiescseq.arg[csiescseq.narg++] = v;
1501                 p = np;
1502                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1503                         break;
1504                 p++;
1505         }
1506         csiescseq.mode = *p;
1507 }
1508
1509 /* for absolute user moves, when decom is set */
1510 void
1511 tmoveato(int x, int y) {
1512         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1513 }
1514
1515 void
1516 tmoveto(int x, int y) {
1517         int miny, maxy;
1518
1519         if(term.c.state & CURSOR_ORIGIN) {
1520                 miny = term.top;
1521                 maxy = term.bot;
1522         } else {
1523                 miny = 0;
1524                 maxy = term.row - 1;
1525         }
1526         LIMIT(x, 0, term.col-1);
1527         LIMIT(y, miny, maxy);
1528         term.c.state &= ~CURSOR_WRAPNEXT;
1529         term.c.x = x;
1530         term.c.y = y;
1531 }
1532
1533 void
1534 tsetchar(char *c, Glyph *attr, int x, int y) {
1535         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1536                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1537                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1538                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1539                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1540                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1541                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1542                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1543                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1544         };
1545
1546         /*
1547          * The table is proudly stolen from rxvt.
1548          */
1549         if(attr->mode & ATTR_GFX) {
1550                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1551                         c = vt100_0[c[0] - 0x41];
1552                 }
1553         }
1554
1555         if(term.line[y][x].mode & ATTR_WIDE) {
1556                 if(x+1 < term.col) {
1557                         term.line[y][x+1].c[0] = ' ';
1558                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1559                 }
1560         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1561                 term.line[y][x-1].c[0] = ' ';
1562                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1563         }
1564
1565         term.dirty[y] = 1;
1566         term.line[y][x] = *attr;
1567         memcpy(term.line[y][x].c, c, UTF_SIZ);
1568 }
1569
1570 void
1571 tclearregion(int x1, int y1, int x2, int y2) {
1572         int x, y, temp;
1573
1574         if(x1 > x2)
1575                 temp = x1, x1 = x2, x2 = temp;
1576         if(y1 > y2)
1577                 temp = y1, y1 = y2, y2 = temp;
1578
1579         LIMIT(x1, 0, term.col-1);
1580         LIMIT(x2, 0, term.col-1);
1581         LIMIT(y1, 0, term.row-1);
1582         LIMIT(y2, 0, term.row-1);
1583
1584         for(y = y1; y <= y2; y++) {
1585                 term.dirty[y] = 1;
1586                 for(x = x1; x <= x2; x++) {
1587                         if(selected(x, y))
1588                                 selclear(NULL);
1589                         term.line[y][x] = term.c.attr;
1590                         memcpy(term.line[y][x].c, " ", 2);
1591                 }
1592         }
1593 }
1594
1595 void
1596 tdeletechar(int n) {
1597         int dst, src, size;
1598         Glyph *line;
1599
1600         LIMIT(n, 0, term.col - term.c.x);
1601
1602         dst = term.c.x;
1603         src = term.c.x + n;
1604         size = term.col - src;
1605         line = term.line[term.c.y];
1606
1607         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1608         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1609 }
1610
1611 void
1612 tinsertblank(int n) {
1613         int dst, src, size;
1614         Glyph *line;
1615
1616         LIMIT(n, 0, term.col - term.c.x);
1617
1618         dst = term.c.x + n;
1619         src = term.c.x;
1620         size = term.col - dst;
1621         line = term.line[term.c.y];
1622
1623         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1624         tclearregion(src, term.c.y, dst - 1, term.c.y);
1625 }
1626
1627 void
1628 tinsertblankline(int n) {
1629         if(BETWEEN(term.c.y, term.top, term.bot))
1630                 tscrolldown(term.c.y, n);
1631 }
1632
1633 void
1634 tdeleteline(int n) {
1635         if(BETWEEN(term.c.y, term.top, term.bot))
1636                 tscrollup(term.c.y, n);
1637 }
1638
1639 int32_t
1640 tdefcolor(int *attr, int *npar, int l) {
1641         int32_t idx = -1;
1642         uint r, g, b;
1643
1644         switch (attr[*npar + 1]) {
1645         case 2: /* direct colour in RGB space */
1646                 if (*npar + 4 >= l) {
1647                         fprintf(stderr,
1648                                 "erresc(38): Incorrect number of parameters (%d)\n",
1649                                 *npar);
1650                         break;
1651                 }
1652                 r = attr[*npar + 2];
1653                 g = attr[*npar + 3];
1654                 b = attr[*npar + 4];
1655                 *npar += 4;
1656                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1657                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1658                                 r, g, b);
1659                 else
1660                         idx = TRUECOLOR(r, g, b);
1661                 break;
1662         case 5: /* indexed colour */
1663                 if (*npar + 2 >= l) {
1664                         fprintf(stderr,
1665                                 "erresc(38): Incorrect number of parameters (%d)\n",
1666                                 *npar);
1667                         break;
1668                 }
1669                 *npar += 2;
1670                 if(!BETWEEN(attr[*npar], 0, 255))
1671                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1672                 else
1673                         idx = attr[*npar];
1674                 break;
1675         case 0: /* implemented defined (only foreground) */
1676         case 1: /* transparent */
1677         case 3: /* direct colour in CMY space */
1678         case 4: /* direct colour in CMYK space */
1679         default:
1680                 fprintf(stderr,
1681                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1682                 break;
1683         }
1684
1685         return idx;
1686 }
1687
1688 void
1689 tsetattr(int *attr, int l) {
1690         int i;
1691         int32_t idx;
1692
1693         for(i = 0; i < l; i++) {
1694                 switch(attr[i]) {
1695                 case 0:
1696                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1697                                         | ATTR_BOLD | ATTR_ITALIC \
1698                                         | ATTR_BLINK);
1699                         term.c.attr.fg = defaultfg;
1700                         term.c.attr.bg = defaultbg;
1701                         break;
1702                 case 1:
1703                         term.c.attr.mode |= ATTR_BOLD;
1704                         break;
1705                 case 3:
1706                         term.c.attr.mode |= ATTR_ITALIC;
1707                         break;
1708                 case 4:
1709                         term.c.attr.mode |= ATTR_UNDERLINE;
1710                         break;
1711                 case 5: /* slow blink */
1712                 case 6: /* rapid blink */
1713                         term.c.attr.mode |= ATTR_BLINK;
1714                         break;
1715                 case 7:
1716                         term.c.attr.mode |= ATTR_REVERSE;
1717                         break;
1718                 case 21:
1719                 case 22:
1720                         term.c.attr.mode &= ~ATTR_BOLD;
1721                         break;
1722                 case 23:
1723                         term.c.attr.mode &= ~ATTR_ITALIC;
1724                         break;
1725                 case 24:
1726                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1727                         break;
1728                 case 25:
1729                 case 26:
1730                         term.c.attr.mode &= ~ATTR_BLINK;
1731                         break;
1732                 case 27:
1733                         term.c.attr.mode &= ~ATTR_REVERSE;
1734                         break;
1735                 case 38:
1736                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1737                                 term.c.attr.fg = idx;
1738                         break;
1739                 case 39:
1740                         term.c.attr.fg = defaultfg;
1741                         break;
1742                 case 48:
1743                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1744                                 term.c.attr.bg = idx;
1745                         break;
1746                 case 49:
1747                         term.c.attr.bg = defaultbg;
1748                         break;
1749                 default:
1750                         if(BETWEEN(attr[i], 30, 37)) {
1751                                 term.c.attr.fg = attr[i] - 30;
1752                         } else if(BETWEEN(attr[i], 40, 47)) {
1753                                 term.c.attr.bg = attr[i] - 40;
1754                         } else if(BETWEEN(attr[i], 90, 97)) {
1755                                 term.c.attr.fg = attr[i] - 90 + 8;
1756                         } else if(BETWEEN(attr[i], 100, 107)) {
1757                                 term.c.attr.bg = attr[i] - 100 + 8;
1758                         } else {
1759                                 fprintf(stderr,
1760                                         "erresc(default): gfx attr %d unknown\n",
1761                                         attr[i]), csidump();
1762                         }
1763                         break;
1764                 }
1765         }
1766 }
1767
1768 void
1769 tsetscroll(int t, int b) {
1770         int temp;
1771
1772         LIMIT(t, 0, term.row-1);
1773         LIMIT(b, 0, term.row-1);
1774         if(t > b) {
1775                 temp = t;
1776                 t = b;
1777                 b = temp;
1778         }
1779         term.top = t;
1780         term.bot = b;
1781 }
1782
1783 void
1784 tsetmode(bool priv, bool set, int *args, int narg) {
1785         int *lim, mode;
1786         bool alt;
1787
1788         for(lim = args + narg; args < lim; ++args) {
1789                 if(priv) {
1790                         switch(*args) {
1791                         case 1: /* DECCKM -- Cursor key */
1792                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1793                                 break;
1794                         case 5: /* DECSCNM -- Reverse video */
1795                                 mode = term.mode;
1796                                 MODBIT(term.mode, set, MODE_REVERSE);
1797                                 if(mode != term.mode)
1798                                         redraw(REDRAW_TIMEOUT);
1799                                 break;
1800                         case 6: /* DECOM -- Origin */
1801                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1802                                 tmoveato(0, 0);
1803                                 break;
1804                         case 7: /* DECAWM -- Auto wrap */
1805                                 MODBIT(term.mode, set, MODE_WRAP);
1806                                 break;
1807                         case 0:  /* Error (IGNORED) */
1808                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1809                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1810                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1811                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1812                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1813                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1814                         case 42: /* DECNRCM -- National characters (IGNORED) */
1815                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1816                                 break;
1817                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1818                                 MODBIT(term.mode, !set, MODE_HIDE);
1819                                 break;
1820                         case 9:    /* X10 mouse compatibility mode */
1821                                 xsetpointermotion(0);
1822                                 MODBIT(term.mode, 0, MODE_MOUSE);
1823                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1824                                 break;
1825                         case 1000: /* 1000: report button press */
1826                                 xsetpointermotion(0);
1827                                 MODBIT(term.mode, 0, MODE_MOUSE);
1828                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1829                                 break;
1830                         case 1002: /* 1002: report motion on button press */
1831                                 xsetpointermotion(0);
1832                                 MODBIT(term.mode, 0, MODE_MOUSE);
1833                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1834                                 break;
1835                         case 1003: /* 1003: enable all mouse motions */
1836                                 xsetpointermotion(set);
1837                                 MODBIT(term.mode, 0, MODE_MOUSE);
1838                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1839                                 break;
1840                         case 1004: /* 1004: send focus events to tty */
1841                                 MODBIT(term.mode, set, MODE_FOCUS);
1842                                 break;
1843                         case 1006: /* 1006: extended reporting mode */
1844                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1845                                 break;
1846                         case 1034:
1847                                 MODBIT(term.mode, set, MODE_8BIT);
1848                                 break;
1849                         case 1049: /* swap screen & set/restore cursor as xterm */
1850                                 if (!allowaltscreen)
1851                                         break;
1852                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1853                                 /* FALLTHRU */
1854                         case 47: /* swap screen */
1855                         case 1047:
1856                                 if (!allowaltscreen)
1857                                         break;
1858                                 alt = IS_SET(MODE_ALTSCREEN);
1859                                 if(alt) {
1860                                         tclearregion(0, 0, term.col-1,
1861                                                         term.row-1);
1862                                 }
1863                                 if(set ^ alt) /* set is always 1 or 0 */
1864                                         tswapscreen();
1865                                 if(*args != 1049)
1866                                         break;
1867                                 /* FALLTRU */
1868                         case 1048:
1869                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1870                                 break;
1871                         case 2004: /* 2004: bracketed paste mode */
1872                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1873                                 break;
1874                         /* Not implemented mouse modes. See comments there. */
1875                         case 1001: /* mouse highlight mode; can hang the
1876                                       terminal by design when implemented. */
1877                         case 1005: /* UTF-8 mouse mode; will confuse
1878                                       applications not supporting UTF-8
1879                                       and luit. */
1880                         case 1015: /* urxvt mangled mouse mode; incompatible
1881                                       and can be mistaken for other control
1882                                       codes. */
1883                         default:
1884                                 fprintf(stderr,
1885                                         "erresc: unknown private set/reset mode %d\n",
1886                                         *args);
1887                                 break;
1888                         }
1889                 } else {
1890                         switch(*args) {
1891                         case 0:  /* Error (IGNORED) */
1892                                 break;
1893                         case 2:  /* KAM -- keyboard action */
1894                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1895                                 break;
1896                         case 4:  /* IRM -- Insertion-replacement */
1897                                 MODBIT(term.mode, set, MODE_INSERT);
1898                                 break;
1899                         case 12: /* SRM -- Send/Receive */
1900                                 MODBIT(term.mode, !set, MODE_ECHO);
1901                                 break;
1902                         case 20: /* LNM -- Linefeed/new line */
1903                                 MODBIT(term.mode, set, MODE_CRLF);
1904                                 break;
1905                         default:
1906                                 fprintf(stderr,
1907                                         "erresc: unknown set/reset mode %d\n",
1908                                         *args);
1909                                 break;
1910                         }
1911                 }
1912         }
1913 }
1914
1915 void
1916 csihandle(void) {
1917         char buf[40];
1918         int len;
1919
1920         switch(csiescseq.mode) {
1921         default:
1922         unknown:
1923                 fprintf(stderr, "erresc: unknown csi ");
1924                 csidump();
1925                 /* die(""); */
1926                 break;
1927         case '@': /* ICH -- Insert <n> blank char */
1928                 DEFAULT(csiescseq.arg[0], 1);
1929                 tinsertblank(csiescseq.arg[0]);
1930                 break;
1931         case 'A': /* CUU -- Cursor <n> Up */
1932                 DEFAULT(csiescseq.arg[0], 1);
1933                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1934                 break;
1935         case 'B': /* CUD -- Cursor <n> Down */
1936         case 'e': /* VPR --Cursor <n> Down */
1937                 DEFAULT(csiescseq.arg[0], 1);
1938                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1939                 break;
1940         case 'i': /* MC -- Media Copy */
1941                 switch(csiescseq.arg[0]) {
1942                 case 0:
1943                         tdump();
1944                         break;
1945                 case 1:
1946                         tdumpline(term.c.y);
1947                         break;
1948                 case 2:
1949                         tdumpsel();
1950                         break;
1951                 case 4:
1952                         term.mode &= ~MODE_PRINT;
1953                         break;
1954                 case 5:
1955                         term.mode |= MODE_PRINT;
1956                         break;
1957                 }
1958                 break;
1959         case 'c': /* DA -- Device Attributes */
1960                 if(csiescseq.arg[0] == 0)
1961                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1962                 break;
1963         case 'C': /* CUF -- Cursor <n> Forward */
1964         case 'a': /* HPR -- Cursor <n> Forward */
1965                 DEFAULT(csiescseq.arg[0], 1);
1966                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1967                 break;
1968         case 'D': /* CUB -- Cursor <n> Backward */
1969                 DEFAULT(csiescseq.arg[0], 1);
1970                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1971                 break;
1972         case 'E': /* CNL -- Cursor <n> Down and first col */
1973                 DEFAULT(csiescseq.arg[0], 1);
1974                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1975                 break;
1976         case 'F': /* CPL -- Cursor <n> Up and first col */
1977                 DEFAULT(csiescseq.arg[0], 1);
1978                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1979                 break;
1980         case 'g': /* TBC -- Tabulation clear */
1981                 switch(csiescseq.arg[0]) {
1982                 case 0: /* clear current tab stop */
1983                         term.tabs[term.c.x] = 0;
1984                         break;
1985                 case 3: /* clear all the tabs */
1986                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1987                         break;
1988                 default:
1989                         goto unknown;
1990                 }
1991                 break;
1992         case 'G': /* CHA -- Move to <col> */
1993         case '`': /* HPA */
1994                 DEFAULT(csiescseq.arg[0], 1);
1995                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1996                 break;
1997         case 'H': /* CUP -- Move to <row> <col> */
1998         case 'f': /* HVP */
1999                 DEFAULT(csiescseq.arg[0], 1);
2000                 DEFAULT(csiescseq.arg[1], 1);
2001                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2002                 break;
2003         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2004                 DEFAULT(csiescseq.arg[0], 1);
2005                 tputtab(csiescseq.arg[0]);
2006                 break;
2007         case 'J': /* ED -- Clear screen */
2008                 selclear(NULL);
2009                 switch(csiescseq.arg[0]) {
2010                 case 0: /* below */
2011                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2012                         if(term.c.y < term.row-1) {
2013                                 tclearregion(0, term.c.y+1, term.col-1,
2014                                                 term.row-1);
2015                         }
2016                         break;
2017                 case 1: /* above */
2018                         if(term.c.y > 1)
2019                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2020                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2021                         break;
2022                 case 2: /* all */
2023                         tclearregion(0, 0, term.col-1, term.row-1);
2024                         break;
2025                 default:
2026                         goto unknown;
2027                 }
2028                 break;
2029         case 'K': /* EL -- Clear line */
2030                 switch(csiescseq.arg[0]) {
2031                 case 0: /* right */
2032                         tclearregion(term.c.x, term.c.y, term.col-1,
2033                                         term.c.y);
2034                         break;
2035                 case 1: /* left */
2036                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2037                         break;
2038                 case 2: /* all */
2039                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2040                         break;
2041                 }
2042                 break;
2043         case 'S': /* SU -- Scroll <n> line up */
2044                 DEFAULT(csiescseq.arg[0], 1);
2045                 tscrollup(term.top, csiescseq.arg[0]);
2046                 break;
2047         case 'T': /* SD -- Scroll <n> line down */
2048                 DEFAULT(csiescseq.arg[0], 1);
2049                 tscrolldown(term.top, csiescseq.arg[0]);
2050                 break;
2051         case 'L': /* IL -- Insert <n> blank lines */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tinsertblankline(csiescseq.arg[0]);
2054                 break;
2055         case 'l': /* RM -- Reset Mode */
2056                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2057                 break;
2058         case 'M': /* DL -- Delete <n> lines */
2059                 DEFAULT(csiescseq.arg[0], 1);
2060                 tdeleteline(csiescseq.arg[0]);
2061                 break;
2062         case 'X': /* ECH -- Erase <n> char */
2063                 DEFAULT(csiescseq.arg[0], 1);
2064                 tclearregion(term.c.x, term.c.y,
2065                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2066                 break;
2067         case 'P': /* DCH -- Delete <n> char */
2068                 DEFAULT(csiescseq.arg[0], 1);
2069                 tdeletechar(csiescseq.arg[0]);
2070                 break;
2071         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 tputtab(-csiescseq.arg[0]);
2074                 break;
2075         case 'd': /* VPA -- Move to <row> */
2076                 DEFAULT(csiescseq.arg[0], 1);
2077                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2078                 break;
2079         case 'h': /* SM -- Set terminal mode */
2080                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2081                 break;
2082         case 'm': /* SGR -- Terminal attribute (color) */
2083                 tsetattr(csiescseq.arg, csiescseq.narg);
2084                 break;
2085         case 'n': /* DSR – Device Status Report (cursor position) */
2086                 if (csiescseq.arg[0] == 6) {
2087                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2088                                         term.c.y+1, term.c.x+1);
2089                         ttywrite(buf, len);
2090                 }
2091                 break;
2092         case 'r': /* DECSTBM -- Set Scrolling Region */
2093                 if(csiescseq.priv) {
2094                         goto unknown;
2095                 } else {
2096                         DEFAULT(csiescseq.arg[0], 1);
2097                         DEFAULT(csiescseq.arg[1], term.row);
2098                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2099                         tmoveato(0, 0);
2100                 }
2101                 break;
2102         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2103                 tcursor(CURSOR_SAVE);
2104                 break;
2105         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2106                 tcursor(CURSOR_LOAD);
2107                 break;
2108         }
2109 }
2110
2111 void
2112 csidump(void) {
2113         int i;
2114         uint c;
2115
2116         printf("ESC[");
2117         for(i = 0; i < csiescseq.len; i++) {
2118                 c = csiescseq.buf[i] & 0xff;
2119                 if(isprint(c)) {
2120                         putchar(c);
2121                 } else if(c == '\n') {
2122                         printf("(\\n)");
2123                 } else if(c == '\r') {
2124                         printf("(\\r)");
2125                 } else if(c == 0x1b) {
2126                         printf("(\\e)");
2127                 } else {
2128                         printf("(%02x)", c);
2129                 }
2130         }
2131         putchar('\n');
2132 }
2133
2134 void
2135 csireset(void) {
2136         memset(&csiescseq, 0, sizeof(csiescseq));
2137 }
2138
2139 void
2140 strhandle(void) {
2141         char *p = NULL;
2142         int j, narg, par;
2143
2144         term.esc &= ~(ESC_STR_END|ESC_STR);
2145         strparse();
2146         narg = strescseq.narg;
2147         par = atoi(strescseq.args[0]);
2148
2149         switch(strescseq.type) {
2150         case ']': /* OSC -- Operating System Command */
2151                 switch(par) {
2152                 case 0:
2153                 case 1:
2154                 case 2:
2155                         if(narg > 1)
2156                                 xsettitle(strescseq.args[1]);
2157                         return;
2158                 case 4: /* color set */
2159                         if(narg < 3)
2160                                 break;
2161                         p = strescseq.args[2];
2162                         /* fall through */
2163                 case 104: /* color reset, here p = NULL */
2164                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2165                         if (!xsetcolorname(j, p)) {
2166                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2167                         } else {
2168                                 /*
2169                                  * TODO if defaultbg color is changed, borders
2170                                  * are dirty
2171                                  */
2172                                 redraw(0);
2173                         }
2174                         return;
2175                 }
2176                 break;
2177         case 'k': /* old title set compatibility */
2178                 xsettitle(strescseq.args[0]);
2179                 return;
2180         case 'P': /* DCS -- Device Control String */
2181         case '_': /* APC -- Application Program Command */
2182         case '^': /* PM -- Privacy Message */
2183                 return;
2184         }
2185
2186         fprintf(stderr, "erresc: unknown str ");
2187         strdump();
2188 }
2189
2190 void
2191 strparse(void) {
2192         char *p = strescseq.buf;
2193
2194         strescseq.narg = 0;
2195         strescseq.buf[strescseq.len] = '\0';
2196         while(p && strescseq.narg < STR_ARG_SIZ)
2197                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2198 }
2199
2200 void
2201 strdump(void) {
2202         int i;
2203         uint c;
2204
2205         printf("ESC%c", strescseq.type);
2206         for(i = 0; i < strescseq.len; i++) {
2207                 c = strescseq.buf[i] & 0xff;
2208                 if(c == '\0') {
2209                         return;
2210                 } else if(isprint(c)) {
2211                         putchar(c);
2212                 } else if(c == '\n') {
2213                         printf("(\\n)");
2214                 } else if(c == '\r') {
2215                         printf("(\\r)");
2216                 } else if(c == 0x1b) {
2217                         printf("(\\e)");
2218                 } else {
2219                         printf("(%02x)", c);
2220                 }
2221         }
2222         printf("ESC\\\n");
2223 }
2224
2225 void
2226 strreset(void) {
2227         memset(&strescseq, 0, sizeof(strescseq));
2228 }
2229
2230 void
2231 tprinter(char *s, size_t len) {
2232         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2233                 fprintf(stderr, "Error writing in %s:%s\n",
2234                         opt_io, strerror(errno));
2235                 close(iofd);
2236                 iofd = -1;
2237         }
2238 }
2239
2240 void
2241 toggleprinter(const Arg *arg) {
2242         term.mode ^= MODE_PRINT;
2243 }
2244
2245 void
2246 printscreen(const Arg *arg) {
2247         tdump();
2248 }
2249
2250 void
2251 printsel(const Arg *arg) {
2252         tdumpsel();
2253 }
2254
2255 void
2256 tdumpsel(void) {
2257         char *ptr;
2258
2259         if((ptr = getsel())) {
2260                 tprinter(ptr, strlen(ptr));
2261                 free(ptr);
2262         }
2263 }
2264
2265 void
2266 tdumpline(int n) {
2267         Glyph *bp, *end;
2268
2269         bp = &term.line[n][0];
2270         end = &bp[term.col-1];
2271         while(end > bp && !strcmp(" ", end->c))
2272                 --end;
2273         if(bp != end || strcmp(bp->c, " ")) {
2274                 for( ;bp <= end; ++bp)
2275                         tprinter(bp->c, strlen(bp->c));
2276         }
2277         tprinter("\n", 1);
2278 }
2279
2280 void
2281 tdump(void) {
2282         int i;
2283
2284         for(i = 0; i < term.row; ++i)
2285                 tdumpline(i);
2286 }
2287
2288 void
2289 tputtab(int n) {
2290         uint x = term.c.x;
2291
2292         if(n > 0) {
2293                 while(x < term.col && n--)
2294                         for(++x; x < term.col && !term.tabs[x]; ++x)
2295                                 /* nothing */ ;
2296         } else if(n < 0) {
2297                 while(x > 0 && n++)
2298                         for(--x; x > 0 && !term.tabs[x]; --x)
2299                                 /* nothing */ ;
2300         }
2301         tmoveto(x, term.c.y);
2302 }
2303
2304 void
2305 techo(char *buf, int len) {
2306         for(; len > 0; buf++, len--) {
2307                 char c = *buf;
2308
2309                 if(ISCONTROL(c)) { /* control code */
2310                         if(c & 0x80) {
2311                                 c &= 0x7f;
2312                                 tputc("^", 1);
2313                                 tputc("[", 1);
2314                         } else if(c != '\n' && c != '\r' && c != '\t') {
2315                                 c ^= '\x40';
2316                                 tputc("^", 1);
2317                         }
2318                         tputc(&c, 1);
2319                 } else {
2320                         break;
2321                 }
2322         }
2323         if(len)
2324                 tputc(buf, len);
2325 }
2326
2327 void
2328 tdeftran(char ascii) {
2329         char c, (*bp)[2];
2330         static char tbl[][2] = {
2331                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2332                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2333                 {'5', CS_FIN},      {'C', CS_FIN},
2334                 {0, 0}
2335         };
2336
2337         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2338                 /* nothing */;
2339
2340         if (c == 0)
2341                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2342         else
2343                 term.trantbl[term.icharset] = (*bp)[1];
2344 }
2345
2346 void
2347 tselcs(void) {
2348         MODBIT(term.c.attr.mode,
2349                term.trantbl[term.charset] == CS_GRAPHIC0,
2350                ATTR_GFX);
2351 }
2352
2353 bool
2354 tcontrolcode(uchar ascii) {
2355         static char question[UTF_SIZ] = "?";
2356
2357         switch(ascii) {
2358         case '\t':   /* HT */
2359                 tputtab(1);
2360                 break;
2361         case '\b':   /* BS */
2362                 tmoveto(term.c.x-1, term.c.y);
2363                 break;
2364         case '\r':   /* CR */
2365                 tmoveto(0, term.c.y);
2366                 break;
2367         case '\f':   /* LF */
2368         case '\v':   /* VT */
2369         case '\n':   /* LF */
2370                 /* go to first col if the mode is set */
2371                 tnewline(IS_SET(MODE_CRLF));
2372                 break;
2373         case '\a':   /* BEL */
2374                 if(term.esc & ESC_STR_END) {
2375                         /* backwards compatibility to xterm */
2376                         strhandle();
2377                 } else {
2378                         if(!(xw.state & WIN_FOCUSED))
2379                                 xseturgency(1);
2380                         if (bellvolume)
2381                                 XBell(xw.dpy, bellvolume);
2382                 }
2383                 break;
2384         case '\033': /* ESC */
2385                 csireset();
2386                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2387                 term.esc |= ESC_START;
2388                 return 1;
2389         case '\016': /* SO */
2390                 term.charset = 0;
2391                 tselcs();
2392                 break;
2393         case '\017': /* SI */
2394                 term.charset = 1;
2395                 tselcs();
2396                 break;
2397         case '\032': /* SUB */
2398                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2399         case '\030': /* CAN */
2400                 csireset();
2401                 break;
2402         case '\005': /* ENQ (IGNORED) */
2403         case '\000': /* NUL (IGNORED) */
2404         case '\021': /* XON (IGNORED) */
2405         case '\023': /* XOFF (IGNORED) */
2406         case 0177:   /* DEL (IGNORED) */
2407         case 0x84:   /* TODO: IND */
2408         case 0x85:   /* TODO: NEL */
2409         case 0x88:   /* TODO: HTS */
2410         case 0x8d:   /* TODO: RI */
2411         case 0x8e:   /* TODO: SS2 */
2412         case 0x8f:   /* TODO: SS3 */
2413         case 0x90:   /* TODO: DCS */
2414         case 0x98:   /* TODO: SOS */
2415         case 0x9a:   /* TODO: DECID */
2416         case 0x9b:   /* TODO: CSI */
2417         case 0x9c:   /* TODO: ST */
2418         case 0x9d:   /* TODO: OSC */
2419         case 0x9e:   /* TODO: PM */
2420         case 0x9f:   /* TODO: APC */
2421                 break;
2422         default:
2423                 return 0;
2424         }
2425         term.esc &= ~(ESC_STR_END|ESC_STR);
2426         return 1;
2427 }
2428
2429 void
2430 tdectest(char c) {
2431         static char E[UTF_SIZ] = "E";
2432         int x, y;
2433
2434         if(c == '8') { /* DEC screen alignment test. */
2435                 for(x = 0; x < term.col; ++x) {
2436                         for(y = 0; y < term.row; ++y)
2437                                 tsetchar(E, &term.c.attr, x, y);
2438                 }
2439         }
2440 }
2441
2442 void
2443 tputc(char *c, int len) {
2444         uchar ascii;
2445         bool control;
2446         long unicodep;
2447         int width;
2448         Glyph *gp;
2449
2450         if(len == 1) {
2451                 width = 1;
2452                 unicodep = ascii = *c;
2453         } else {
2454                 utf8decode(c, &unicodep, UTF_SIZ);
2455                 width = wcwidth(unicodep);
2456                 control = ISCONTROLC1(unicodep);
2457                 ascii = unicodep;
2458         }
2459
2460         if(IS_SET(MODE_PRINT))
2461                 tprinter(c, len);
2462         control = ISCONTROL(unicodep);
2463
2464         /*
2465          * STR sequence must be checked before anything else
2466          * because it uses all following characters until it
2467          * receives a ESC, a SUB, a ST or any other C1 control
2468          * character.
2469          */
2470         if(term.esc & ESC_STR) {
2471                 if(width == 1 &&
2472                    (ascii == '\a' || ascii == 030 ||
2473                     ascii == 032  || ascii == 033 ||
2474                     ISCONTROLC1(unicodep))) {
2475                         term.esc &= ~ESC_STR;
2476                         term.esc |= ESC_STR_END;
2477                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2478                         memmove(&strescseq.buf[strescseq.len], c, len);
2479                         strescseq.len += len;
2480                         return;
2481                 } else {
2482                 /*
2483                  * Here is a bug in terminals. If the user never sends
2484                  * some code to stop the str or esc command, then st
2485                  * will stop responding. But this is better than
2486                  * silently failing with unknown characters. At least
2487                  * then users will report back.
2488                  *
2489                  * In the case users ever get fixed, here is the code:
2490                  */
2491                 /*
2492                  * term.esc = 0;
2493                  * strhandle();
2494                  */
2495                         return;
2496                 }
2497         }
2498
2499         /*
2500          * Actions of control codes must be performed as soon they arrive
2501          * because they can be embedded inside a control sequence, and
2502          * they must not cause conflicts with sequences.
2503          */
2504         if(control) {
2505                 if (tcontrolcode(ascii))
2506                         return;
2507         } else if(term.esc & ESC_START) {
2508                 if(term.esc & ESC_CSI) {
2509                         csiescseq.buf[csiescseq.len++] = ascii;
2510                         if(BETWEEN(ascii, 0x40, 0x7E)
2511                                         || csiescseq.len >= \
2512                                         sizeof(csiescseq.buf)-1) {
2513                                 term.esc = 0;
2514                                 csiparse();
2515                                 csihandle();
2516                         }
2517                         return;
2518                 } else if(term.esc & ESC_ALTCHARSET) {
2519                         tdeftran(ascii);
2520                         tselcs();
2521                 } else if(term.esc & ESC_TEST) {
2522                         tdectest(ascii);
2523                 } else {
2524                         switch(ascii) {
2525                         case '[':
2526                                 term.esc |= ESC_CSI;
2527                                 return;
2528                         case '#':
2529                                 term.esc |= ESC_TEST;
2530                                 return;
2531                         case 'P': /* DCS -- Device Control String */
2532                         case '_': /* APC -- Application Program Command */
2533                         case '^': /* PM -- Privacy Message */
2534                         case ']': /* OSC -- Operating System Command */
2535                         case 'k': /* old title set compatibility */
2536                                 strreset();
2537                                 strescseq.type = ascii;
2538                                 term.esc |= ESC_STR;
2539                                 return;
2540                         case '(': /* set primary charset G0 */
2541                         case ')': /* set secondary charset G1 */
2542                         case '*': /* set tertiary charset G2 */
2543                         case '+': /* set quaternary charset G3 */
2544                                 term.icharset = ascii - '(';
2545                                 term.esc |= ESC_ALTCHARSET;
2546                                 return;
2547                         case 'D': /* IND -- Linefeed */
2548                                 if(term.c.y == term.bot) {
2549                                         tscrollup(term.top, 1);
2550                                 } else {
2551                                         tmoveto(term.c.x, term.c.y+1);
2552                                 }
2553                                 break;
2554                         case 'E': /* NEL -- Next line */
2555                                 tnewline(1); /* always go to first col */
2556                                 break;
2557                         case 'H': /* HTS -- Horizontal tab stop */
2558                                 term.tabs[term.c.x] = 1;
2559                                 break;
2560                         case 'M': /* RI -- Reverse index */
2561                                 if(term.c.y == term.top) {
2562                                         tscrolldown(term.top, 1);
2563                                 } else {
2564                                         tmoveto(term.c.x, term.c.y-1);
2565                                 }
2566                                 break;
2567                         case 'Z': /* DECID -- Identify Terminal */
2568                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2569                                 break;
2570                         case 'c': /* RIS -- Reset to inital state */
2571                                 treset();
2572                                 xresettitle();
2573                                 xloadcols();
2574                                 break;
2575                         case '=': /* DECPAM -- Application keypad */
2576                                 term.mode |= MODE_APPKEYPAD;
2577                                 break;
2578                         case '>': /* DECPNM -- Normal keypad */
2579                                 term.mode &= ~MODE_APPKEYPAD;
2580                                 break;
2581                         case '7': /* DECSC -- Save Cursor */
2582                                 tcursor(CURSOR_SAVE);
2583                                 break;
2584                         case '8': /* DECRC -- Restore Cursor */
2585                                 tcursor(CURSOR_LOAD);
2586                                 break;
2587                         case '\\': /* ST -- String Terminator */
2588                                 if(term.esc & ESC_STR_END)
2589                                         strhandle();
2590                                 break;
2591                         default:
2592                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2593                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2594                                 break;
2595                         }
2596                 }
2597                 term.esc = 0;
2598                 /*
2599                  * All characters which form part of a sequence are not
2600                  * printed
2601                  */
2602                 return;
2603         }
2604         /*
2605          * Display control codes only if we are in graphic mode
2606          */
2607         if(control && !(term.c.attr.mode & ATTR_GFX))
2608                 return;
2609         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2610                 selclear(NULL);
2611
2612         gp = &term.line[term.c.y][term.c.x];
2613         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2614                 gp->mode |= ATTR_WRAP;
2615                 tnewline(1);
2616         }
2617
2618         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2619                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2620
2621         if(term.c.x+width > term.col)
2622                 tnewline(1);
2623
2624         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2625
2626         if(width == 2) {
2627                 gp->mode |= ATTR_WIDE;
2628                 if(term.c.x+1 < term.col) {
2629                         gp[1].c[0] = '\0';
2630                         gp[1].mode = ATTR_WDUMMY;
2631                 }
2632         }
2633         if(term.c.x+width < term.col) {
2634                 tmoveto(term.c.x+width, term.c.y);
2635         } else {
2636                 term.c.state |= CURSOR_WRAPNEXT;
2637         }
2638 }
2639
2640 int
2641 tresize(int col, int row) {
2642         int i;
2643         int minrow = MIN(row, term.row);
2644         int mincol = MIN(col, term.col);
2645         int slide = term.c.y - row + 1;
2646         bool *bp;
2647         Line *orig;
2648
2649         if(col < 1 || row < 1)
2650                 return 0;
2651
2652         /* free unneeded rows */
2653         i = 0;
2654         if(slide > 0) {
2655                 /*
2656                  * slide screen to keep cursor where we expect it -
2657                  * tscrollup would work here, but we can optimize to
2658                  * memmove because we're freeing the earlier lines
2659                  */
2660                 for(/* i = 0 */; i < slide; i++) {
2661                         free(term.line[i]);
2662                         free(term.alt[i]);
2663                 }
2664                 memmove(term.line, term.line + slide, row * sizeof(Line));
2665                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2666         }
2667         for(i += row; i < term.row; i++) {
2668                 free(term.line[i]);
2669                 free(term.alt[i]);
2670         }
2671
2672         /* resize to new height */
2673         term.line = xrealloc(term.line, row * sizeof(Line));
2674         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2675         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2676         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2677
2678         /* resize each row to new width, zero-pad if needed */
2679         for(i = 0; i < minrow; i++) {
2680                 term.dirty[i] = 1;
2681                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2682                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2683         }
2684
2685         /* allocate any new rows */
2686         for(/* i == minrow */; i < row; i++) {
2687                 term.dirty[i] = 1;
2688                 term.line[i] = xmalloc(col * sizeof(Glyph));
2689                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2690         }
2691         if(col > term.col) {
2692                 bp = term.tabs + term.col;
2693
2694                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2695                 while(--bp > term.tabs && !*bp)
2696                         /* nothing */ ;
2697                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2698                         *bp = 1;
2699         }
2700         /* update terminal size */
2701         term.col = col;
2702         term.row = row;
2703         /* reset scrolling region */
2704         tsetscroll(0, row-1);
2705         /* make use of the LIMIT in tmoveto */
2706         tmoveto(term.c.x, term.c.y);
2707         /* Clearing both screens */
2708         orig = term.line;
2709         do {
2710                 if(mincol < col && 0 < minrow) {
2711                         tclearregion(mincol, 0, col - 1, minrow - 1);
2712                 }
2713                 if(0 < col && minrow < row) {
2714                         tclearregion(0, minrow, col - 1, row - 1);
2715                 }
2716                 tcursor(CURSOR_SAVE);
2717                 tswapscreen();
2718                 tcursor(CURSOR_LOAD);
2719         } while(orig != term.line);
2720
2721         return (slide > 0);
2722 }
2723
2724 void
2725 xresize(int col, int row) {
2726         xw.tw = MAX(1, col * xw.cw);
2727         xw.th = MAX(1, row * xw.ch);
2728
2729         XFreePixmap(xw.dpy, xw.buf);
2730         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2731                         DefaultDepth(xw.dpy, xw.scr));
2732         XftDrawChange(xw.draw, xw.buf);
2733         xclear(0, 0, xw.w, xw.h);
2734 }
2735
2736 static inline ushort
2737 sixd_to_16bit(int x) {
2738         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2739 }
2740
2741 void
2742 xloadcols(void) {
2743         int i, r, g, b;
2744         XRenderColor color = { .alpha = 0xffff };
2745         static bool loaded;
2746         Colour *cp;
2747
2748         if(loaded) {
2749                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2750                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2751         }
2752
2753         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2754         for(i = 0; i < LEN(colorname); i++) {
2755                 if(!colorname[i])
2756                         continue;
2757                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2758                         die("Could not allocate color '%s'\n", colorname[i]);
2759                 }
2760         }
2761
2762         /* load colors [16-255] ; same colors as xterm */
2763         for(i = 16, r = 0; r < 6; r++) {
2764                 for(g = 0; g < 6; g++) {
2765                         for(b = 0; b < 6; b++) {
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, &dc.col[i])) {
2770                                         die("Could not allocate color %d\n", i);
2771                                 }
2772                                 i++;
2773                         }
2774                 }
2775         }
2776
2777         for(r = 0; r < 24; r++, i++) {
2778                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2779                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2780                                         &dc.col[i])) {
2781                         die("Could not allocate color %d\n", i);
2782                 }
2783         }
2784         loaded = true;
2785 }
2786
2787 int
2788 xsetcolorname(int x, const char *name) {
2789         XRenderColor color = { .alpha = 0xffff };
2790         Colour colour;
2791         if(!BETWEEN(x, 0, LEN(colorname)))
2792                 return -1;
2793         if(!name) {
2794                 if(BETWEEN(x, 16, 16 + 215)) {
2795                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2796                         color.red = sixd_to_16bit(r);
2797                         color.green = sixd_to_16bit(g);
2798                         color.blue = sixd_to_16bit(b);
2799                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2800                                 return 0; /* something went wrong */
2801                         dc.col[x] = colour;
2802                         return 1;
2803                 } else if(BETWEEN(x, 16 + 216, 255)) {
2804                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2805                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2806                                 return 0; /* something went wrong */
2807                         dc.col[x] = colour;
2808                         return 1;
2809                 } else {
2810                         name = colorname[x];
2811                 }
2812         }
2813         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2814                 return 0;
2815         dc.col[x] = colour;
2816         return 1;
2817 }
2818
2819 void
2820 xtermclear(int col1, int row1, int col2, int row2) {
2821         XftDrawRect(xw.draw,
2822                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2823                         borderpx + col1 * xw.cw,
2824                         borderpx + row1 * xw.ch,
2825                         (col2-col1+1) * xw.cw,
2826                         (row2-row1+1) * xw.ch);
2827 }
2828
2829 /*
2830  * Absolute coordinates.
2831  */
2832 void
2833 xclear(int x1, int y1, int x2, int y2) {
2834         XftDrawRect(xw.draw,
2835                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2836                         x1, y1, x2-x1, y2-y1);
2837 }
2838
2839 void
2840 xhints(void) {
2841         XClassHint class = {opt_class ? opt_class : termname, termname};
2842         XWMHints wm = {.flags = InputHint, .input = 1};
2843         XSizeHints *sizeh = NULL;
2844
2845         sizeh = XAllocSizeHints();
2846
2847         sizeh->flags = PSize | PResizeInc | PBaseSize;
2848         sizeh->height = xw.h;
2849         sizeh->width = xw.w;
2850         sizeh->height_inc = xw.ch;
2851         sizeh->width_inc = xw.cw;
2852         sizeh->base_height = 2 * borderpx;
2853         sizeh->base_width = 2 * borderpx;
2854         if(xw.isfixed == True) {
2855                 sizeh->flags |= PMaxSize | PMinSize;
2856                 sizeh->min_width = sizeh->max_width = xw.w;
2857                 sizeh->min_height = sizeh->max_height = xw.h;
2858         }
2859         if(xw.gm & (XValue|YValue)) {
2860                 sizeh->flags |= USPosition | PWinGravity;
2861                 sizeh->x = xw.l;
2862                 sizeh->y = xw.t;
2863                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2864         }
2865
2866         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2867                         &class);
2868         XFree(sizeh);
2869 }
2870
2871 int
2872 xgeommasktogravity(int mask) {
2873         switch(mask & (XNegative|YNegative)) {
2874         case 0:
2875                 return NorthWestGravity;
2876         case XNegative:
2877                 return NorthEastGravity;
2878         case YNegative:
2879                 return SouthWestGravity;
2880         }
2881         return SouthEastGravity;
2882 }
2883
2884 int
2885 xloadfont(Font *f, FcPattern *pattern) {
2886         FcPattern *match;
2887         FcResult result;
2888
2889         match = FcFontMatch(NULL, pattern, &result);
2890         if(!match)
2891                 return 1;
2892
2893         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2894                 FcPatternDestroy(match);
2895                 return 1;
2896         }
2897
2898         f->set = NULL;
2899         f->pattern = FcPatternDuplicate(pattern);
2900
2901         f->ascent = f->match->ascent;
2902         f->descent = f->match->descent;
2903         f->lbearing = 0;
2904         f->rbearing = f->match->max_advance_width;
2905
2906         f->height = f->ascent + f->descent;
2907         f->width = f->lbearing + f->rbearing;
2908
2909         return 0;
2910 }
2911
2912 void
2913 xloadfonts(char *fontstr, double fontsize) {
2914         FcPattern *pattern;
2915         FcResult r_sz, r_psz;
2916         double fontval;
2917
2918         if(fontstr[0] == '-') {
2919                 pattern = XftXlfdParse(fontstr, False, False);
2920         } else {
2921                 pattern = FcNameParse((FcChar8 *)fontstr);
2922         }
2923
2924         if(!pattern)
2925                 die("st: can't open font %s\n", fontstr);
2926
2927         if(fontsize > 0) {
2928                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2929                 FcPatternDel(pattern, FC_SIZE);
2930                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2931                 usedfontsize = fontsize;
2932         } else {
2933                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2934                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2935                 if(r_psz == FcResultMatch) {
2936                         usedfontsize = fontval;
2937                 } else if(r_sz == FcResultMatch) {
2938                         usedfontsize = -1;
2939                 } else {
2940                         /*
2941                          * Default font size is 12, if none given. This is to
2942                          * have a known usedfontsize value.
2943                          */
2944                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2945                         usedfontsize = 12;
2946                 }
2947         }
2948
2949         FcConfigSubstitute(0, pattern, FcMatchPattern);
2950         FcDefaultSubstitute(pattern);
2951
2952         if(xloadfont(&dc.font, pattern))
2953                 die("st: can't open font %s\n", fontstr);
2954
2955         if(usedfontsize < 0) {
2956                 FcPatternGetDouble(dc.font.match->pattern,
2957                                    FC_PIXEL_SIZE, 0, &fontval);
2958                 usedfontsize = fontval;
2959         }
2960
2961         /* Setting character width and height. */
2962         xw.cw = CEIL(dc.font.width * cwscale);
2963         xw.ch = CEIL(dc.font.height * chscale);
2964
2965         FcPatternDel(pattern, FC_SLANT);
2966         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2967         if(xloadfont(&dc.ifont, pattern))
2968                 die("st: can't open font %s\n", fontstr);
2969
2970         FcPatternDel(pattern, FC_WEIGHT);
2971         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2972         if(xloadfont(&dc.ibfont, pattern))
2973                 die("st: can't open font %s\n", fontstr);
2974
2975         FcPatternDel(pattern, FC_SLANT);
2976         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2977         if(xloadfont(&dc.bfont, pattern))
2978                 die("st: can't open font %s\n", fontstr);
2979
2980         FcPatternDestroy(pattern);
2981 }
2982
2983 int
2984 xloadfontset(Font *f) {
2985         FcResult result;
2986
2987         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2988                 return 1;
2989         return 0;
2990 }
2991
2992 void
2993 xunloadfont(Font *f) {
2994         XftFontClose(xw.dpy, f->match);
2995         FcPatternDestroy(f->pattern);
2996         if(f->set)
2997                 FcFontSetDestroy(f->set);
2998 }
2999
3000 void
3001 xunloadfonts(void) {
3002         int i;
3003
3004         /* Free the loaded fonts in the font cache.  */
3005         for(i = 0; i < frclen; i++) {
3006                 XftFontClose(xw.dpy, frc[i].font);
3007         }
3008         frclen = 0;
3009
3010         xunloadfont(&dc.font);
3011         xunloadfont(&dc.bfont);
3012         xunloadfont(&dc.ifont);
3013         xunloadfont(&dc.ibfont);
3014 }
3015
3016 void
3017 xzoom(const Arg *arg) {
3018         xunloadfonts();
3019         xloadfonts(usedfont, usedfontsize + arg->i);
3020         cresize(0, 0);
3021         redraw(0);
3022 }
3023
3024 void
3025 xinit(void) {
3026         XGCValues gcvalues;
3027         Cursor cursor;
3028         Window parent;
3029         pid_t thispid = getpid();
3030
3031         if(!(xw.dpy = XOpenDisplay(NULL)))
3032                 die("Can't open display\n");
3033         xw.scr = XDefaultScreen(xw.dpy);
3034         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3035
3036         /* font */
3037         if(!FcInit())
3038                 die("Could not init fontconfig.\n");
3039
3040         usedfont = (opt_font == NULL)? font : opt_font;
3041         xloadfonts(usedfont, 0);
3042
3043         /* colors */
3044         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3045         xloadcols();
3046
3047         /* adjust fixed window geometry */
3048         xw.w = 2 * borderpx + term.col * xw.cw;
3049         xw.h = 2 * borderpx + term.row * xw.ch;
3050         if(xw.gm & XNegative)
3051                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3052         if(xw.gm & YNegative)
3053                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3054
3055         /* Events */
3056         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3057         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3058         xw.attrs.bit_gravity = NorthWestGravity;
3059         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3060                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3061                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3062         xw.attrs.colormap = xw.cmap;
3063
3064         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3065                         XRootWindow(xw.dpy, xw.scr);
3066         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3067                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3068                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3069                         | CWEventMask | CWColormap, &xw.attrs);
3070
3071         memset(&gcvalues, 0, sizeof(gcvalues));
3072         gcvalues.graphics_exposures = False;
3073         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3074                         &gcvalues);
3075         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3076                         DefaultDepth(xw.dpy, xw.scr));
3077         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3078         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3079
3080         /* Xft rendering context */
3081         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3082
3083         /* input methods */
3084         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3085                 XSetLocaleModifiers("@im=local");
3086                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3087                         XSetLocaleModifiers("@im=");
3088                         if((xw.xim = XOpenIM(xw.dpy,
3089                                         NULL, NULL, NULL)) == NULL) {
3090                                 die("XOpenIM failed. Could not open input"
3091                                         " device.\n");
3092                         }
3093                 }
3094         }
3095         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3096                                            | XIMStatusNothing, XNClientWindow, xw.win,
3097                                            XNFocusWindow, xw.win, NULL);
3098         if(xw.xic == NULL)
3099                 die("XCreateIC failed. Could not obtain input method.\n");
3100
3101         /* white cursor, black outline */
3102         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3103         XDefineCursor(xw.dpy, xw.win, cursor);
3104         XRecolorCursor(xw.dpy, cursor,
3105                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3106                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3107
3108         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3109         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3110         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3111         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3112
3113         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3114         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3115                         PropModeReplace, (uchar *)&thispid, 1);
3116
3117         xresettitle();
3118         XMapWindow(xw.dpy, xw.win);
3119         xhints();
3120         XSync(xw.dpy, False);
3121 }
3122
3123 void
3124 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3125         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3126             width = charlen * xw.cw, xp, i;
3127         int frcflags;
3128         int u8fl, u8fblen, u8cblen, doesexist;
3129         char *u8c, *u8fs;
3130         long unicodep;
3131         Font *font = &dc.font;
3132         FcResult fcres;
3133         FcPattern *fcpattern, *fontpattern;
3134         FcFontSet *fcsets[] = { NULL };
3135         FcCharSet *fccharset;
3136         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3137         XRenderColor colfg, colbg;
3138         XRectangle r;
3139         int oneatatime;
3140
3141         frcflags = FRC_NORMAL;
3142
3143         if(base.mode & ATTR_ITALIC) {
3144                 if(base.fg == defaultfg)
3145                         base.fg = defaultitalic;
3146                 font = &dc.ifont;
3147                 frcflags = FRC_ITALIC;
3148         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3149                 if(base.fg == defaultfg)
3150                         base.fg = defaultitalic;
3151                 font = &dc.ibfont;
3152                 frcflags = FRC_ITALICBOLD;
3153         } else if(base.mode & ATTR_UNDERLINE) {
3154                 if(base.fg == defaultfg)
3155                         base.fg = defaultunderline;
3156         }
3157
3158         if(IS_TRUECOL(base.fg)) {
3159                 colfg.alpha = 0xffff;
3160                 colfg.red = TRUERED(base.fg);
3161                 colfg.green = TRUEGREEN(base.fg);
3162                 colfg.blue = TRUEBLUE(base.fg);
3163                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3164                 fg = &truefg;
3165         } else {
3166                 fg = &dc.col[base.fg];
3167         }
3168
3169         if(IS_TRUECOL(base.bg)) {
3170                 colbg.alpha = 0xffff;
3171                 colbg.green = TRUEGREEN(base.bg);
3172                 colbg.red = TRUERED(base.bg);
3173                 colbg.blue = TRUEBLUE(base.bg);
3174                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3175                 bg = &truebg;
3176         } else {
3177                 bg = &dc.col[base.bg];
3178         }
3179
3180         if(base.mode & ATTR_BOLD) {
3181                 if(BETWEEN(base.fg, 0, 7)) {
3182                         /* basic system colors */
3183                         fg = &dc.col[base.fg + 8];
3184                 } else if(BETWEEN(base.fg, 16, 195)) {
3185                         /* 256 colors */
3186                         fg = &dc.col[base.fg + 36];
3187                 } else if(BETWEEN(base.fg, 232, 251)) {
3188                         /* greyscale */
3189                         fg = &dc.col[base.fg + 4];
3190                 }
3191                 /*
3192                  * Those ranges will not be brightened:
3193                  *    8 - 15 – bright system colors
3194                  *    196 - 231 – highest 256 color cube
3195                  *    252 - 255 – brightest colors in greyscale
3196                  */
3197                 font = &dc.bfont;
3198                 frcflags = FRC_BOLD;
3199         }
3200
3201         if(IS_SET(MODE_REVERSE)) {
3202                 if(fg == &dc.col[defaultfg]) {
3203                         fg = &dc.col[defaultbg];
3204                 } else {
3205                         colfg.red = ~fg->color.red;
3206                         colfg.green = ~fg->color.green;
3207                         colfg.blue = ~fg->color.blue;
3208                         colfg.alpha = fg->color.alpha;
3209                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3210                                         &revfg);
3211                         fg = &revfg;
3212                 }
3213
3214                 if(bg == &dc.col[defaultbg]) {
3215                         bg = &dc.col[defaultfg];
3216                 } else {
3217                         colbg.red = ~bg->color.red;
3218                         colbg.green = ~bg->color.green;
3219                         colbg.blue = ~bg->color.blue;
3220                         colbg.alpha = bg->color.alpha;
3221                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3222                                         &revbg);
3223                         bg = &revbg;
3224                 }
3225         }
3226
3227         if(base.mode & ATTR_REVERSE) {
3228                 temp = fg;
3229                 fg = bg;
3230                 bg = temp;
3231         }
3232
3233         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3234                 fg = bg;
3235
3236         /* Intelligent cleaning up of the borders. */
3237         if(x == 0) {
3238                 xclear(0, (y == 0)? 0 : winy, borderpx,
3239                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3240         }
3241         if(x + charlen >= term.col) {
3242                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3243                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3244         }
3245         if(y == 0)
3246                 xclear(winx, 0, winx + width, borderpx);
3247         if(y == term.row-1)
3248                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3249
3250         /* Clean up the region we want to draw to. */
3251         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3252
3253         /* Set the clip region because Xft is sometimes dirty. */
3254         r.x = 0;
3255         r.y = 0;
3256         r.height = xw.ch;
3257         r.width = width;
3258         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3259
3260         for(xp = winx; bytelen > 0;) {
3261                 /*
3262                  * Search for the range in the to be printed string of glyphs
3263                  * that are in the main font. Then print that range. If
3264                  * some glyph is found that is not in the font, do the
3265                  * fallback dance.
3266                  */
3267                 u8fs = s;
3268                 u8fblen = 0;
3269                 u8fl = 0;
3270                 oneatatime = font->width != xw.cw;
3271                 for(;;) {
3272                         u8c = s;
3273                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3274                         s += u8cblen;
3275                         bytelen -= u8cblen;
3276
3277                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3278                         if(oneatatime || !doesexist || bytelen <= 0) {
3279                                 if(oneatatime || bytelen <= 0) {
3280                                         if(doesexist) {
3281                                                 u8fl++;
3282                                                 u8fblen += u8cblen;
3283                                         }
3284                                 }
3285
3286                                 if(u8fl > 0) {
3287                                         XftDrawStringUtf8(xw.draw, fg,
3288                                                         font->match, xp,
3289                                                         winy + font->ascent,
3290                                                         (FcChar8 *)u8fs,
3291                                                         u8fblen);
3292                                         xp += xw.cw * u8fl;
3293
3294                                 }
3295                                 break;
3296                         }
3297
3298                         u8fl++;
3299                         u8fblen += u8cblen;
3300                 }
3301                 if(doesexist) {
3302                         if(oneatatime)
3303                                 continue;
3304                         break;
3305                 }
3306
3307                 /* Search the font cache. */
3308                 for(i = 0; i < frclen; i++) {
3309                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3310                                         && frc[i].flags == frcflags) {
3311                                 break;
3312                         }
3313                 }
3314
3315                 /* Nothing was found. */
3316                 if(i >= frclen) {
3317                         if(!font->set)
3318                                 xloadfontset(font);
3319                         fcsets[0] = font->set;
3320
3321                         /*
3322                          * Nothing was found in the cache. Now use
3323                          * some dozen of Fontconfig calls to get the
3324                          * font for one single character.
3325                          *
3326                          * Xft and fontconfig are design failures.
3327                          */
3328                         fcpattern = FcPatternDuplicate(font->pattern);
3329                         fccharset = FcCharSetCreate();
3330
3331                         FcCharSetAddChar(fccharset, unicodep);
3332                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3333                                         fccharset);
3334                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3335                                         FcTrue);
3336
3337                         FcConfigSubstitute(0, fcpattern,
3338                                         FcMatchPattern);
3339                         FcDefaultSubstitute(fcpattern);
3340
3341                         fontpattern = FcFontSetMatch(0, fcsets,
3342                                         FcTrue, fcpattern, &fcres);
3343
3344                         /*
3345                          * Overwrite or create the new cache entry.
3346                          */
3347                         if(frclen >= LEN(frc)) {
3348                                 frclen = LEN(frc) - 1;
3349                                 XftFontClose(xw.dpy, frc[frclen].font);
3350                         }
3351
3352                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3353                                         fontpattern);
3354                         frc[frclen].flags = frcflags;
3355
3356                         i = frclen;
3357                         frclen++;
3358
3359                         FcPatternDestroy(fcpattern);
3360                         FcCharSetDestroy(fccharset);
3361                 }
3362
3363                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3364                                 xp, winy + frc[i].font->ascent,
3365                                 (FcChar8 *)u8c, u8cblen);
3366
3367                 xp += xw.cw * wcwidth(unicodep);
3368         }
3369
3370         /*
3371          * This is how the loop above actually should be. Why does the
3372          * application have to care about font details?
3373          *
3374          * I have to repeat: Xft and Fontconfig are design failures.
3375          */
3376         /*
3377         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3378                         winy + font->ascent, (FcChar8 *)s, bytelen);
3379         */
3380
3381         if(base.mode & ATTR_UNDERLINE) {
3382                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3383                                 width, 1);
3384         }
3385
3386         /* Reset clip to none. */
3387         XftDrawSetClip(xw.draw, 0);
3388 }
3389
3390 void
3391 xdrawcursor(void) {
3392         static int oldx = 0, oldy = 0;
3393         int sl, width, curx;
3394         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3395
3396         LIMIT(oldx, 0, term.col-1);
3397         LIMIT(oldy, 0, term.row-1);
3398
3399         curx = term.c.x;
3400
3401         /* adjust position if in dummy */
3402         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3403                 oldx--;
3404         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3405                 curx--;
3406
3407         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3408
3409         /* remove the old cursor */
3410         sl = utf8len(term.line[oldy][oldx].c);
3411         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3412         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3413                         oldy, width, sl);
3414
3415         /* draw the new one */
3416         if(!(IS_SET(MODE_HIDE))) {
3417                 if(xw.state & WIN_FOCUSED) {
3418                         if(IS_SET(MODE_REVERSE)) {
3419                                 g.mode |= ATTR_REVERSE;
3420                                 g.fg = defaultcs;
3421                                 g.bg = defaultfg;
3422                         }
3423
3424                         sl = utf8len(g.c);
3425                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3426                                 ? 2 : 1;
3427                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3428                 } else {
3429                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3430                                         borderpx + curx * xw.cw,
3431                                         borderpx + term.c.y * xw.ch,
3432                                         xw.cw - 1, 1);
3433                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3434                                         borderpx + curx * xw.cw,
3435                                         borderpx + term.c.y * xw.ch,
3436                                         1, xw.ch - 1);
3437                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3438                                         borderpx + (curx + 1) * xw.cw - 1,
3439                                         borderpx + term.c.y * xw.ch,
3440                                         1, xw.ch - 1);
3441                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3442                                         borderpx + curx * xw.cw,
3443                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3444                                         xw.cw, 1);
3445                 }
3446                 oldx = curx, oldy = term.c.y;
3447         }
3448 }
3449
3450
3451 void
3452 xsettitle(char *p) {
3453         XTextProperty prop;
3454
3455         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3456                         &prop);
3457         XSetWMName(xw.dpy, xw.win, &prop);
3458         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3459         XFree(prop.value);
3460 }
3461
3462 void
3463 xresettitle(void) {
3464         xsettitle(opt_title ? opt_title : "st");
3465 }
3466
3467 void
3468 redraw(int timeout) {
3469         struct timespec tv = {0, timeout * 1000};
3470
3471         draw();
3472
3473         if(timeout > 0) {
3474                 nanosleep(&tv, NULL);
3475                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3476         }
3477 }
3478
3479 void
3480 draw(void) {
3481         drawregion(0, 0, term.col, term.row);
3482         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3483                         xw.h, 0, 0);
3484         XSetForeground(xw.dpy, dc.gc,
3485                         dc.col[IS_SET(MODE_REVERSE)?
3486                                 defaultfg : defaultbg].pixel);
3487 }
3488
3489 void
3490 drawregion(int x1, int y1, int x2, int y2) {
3491         int ic, ib, x, y, ox, sl;
3492         Glyph base, new;
3493         char buf[DRAW_BUF_SIZ];
3494         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3495         long unicodep;
3496
3497         if(!(xw.state & WIN_VISIBLE))
3498                 return;
3499
3500         for(y = y1; y < y2; y++) {
3501                 if(!term.dirty[y])
3502                         continue;
3503
3504                 xtermclear(0, y, term.col, y);
3505                 term.dirty[y] = 0;
3506                 base = term.line[y][0];
3507                 ic = ib = ox = 0;
3508                 for(x = x1; x < x2; x++) {
3509                         new = term.line[y][x];
3510                         if(new.mode == ATTR_WDUMMY)
3511                                 continue;
3512                         if(ena_sel && selected(x, y))
3513                                 new.mode ^= ATTR_REVERSE;
3514                         if(ib > 0 && (ATTRCMP(base, new)
3515                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3516                                 xdraws(buf, base, ox, y, ic, ib);
3517                                 ic = ib = 0;
3518                         }
3519                         if(ib == 0) {
3520                                 ox = x;
3521                                 base = new;
3522                         }
3523
3524                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3525                         memcpy(buf+ib, new.c, sl);
3526                         ib += sl;
3527                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3528                 }
3529                 if(ib > 0)
3530                         xdraws(buf, base, ox, y, ic, ib);
3531         }
3532         xdrawcursor();
3533 }
3534
3535 void
3536 expose(XEvent *ev) {
3537         XExposeEvent *e = &ev->xexpose;
3538
3539         if(xw.state & WIN_REDRAW) {
3540                 if(!e->count)
3541                         xw.state &= ~WIN_REDRAW;
3542         }
3543         redraw(0);
3544 }
3545
3546 void
3547 visibility(XEvent *ev) {
3548         XVisibilityEvent *e = &ev->xvisibility;
3549
3550         if(e->state == VisibilityFullyObscured) {
3551                 xw.state &= ~WIN_VISIBLE;
3552         } else if(!(xw.state & WIN_VISIBLE)) {
3553                 /* need a full redraw for next Expose, not just a buf copy */
3554                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3555         }
3556 }
3557
3558 void
3559 unmap(XEvent *ev) {
3560         xw.state &= ~WIN_VISIBLE;
3561 }
3562
3563 void
3564 xsetpointermotion(int set) {
3565         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3566         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3567 }
3568
3569 void
3570 xseturgency(int add) {
3571         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3572
3573         MODBIT(h->flags, add, XUrgencyHint);
3574         XSetWMHints(xw.dpy, xw.win, h);
3575         XFree(h);
3576 }
3577
3578 void
3579 focus(XEvent *ev) {
3580         XFocusChangeEvent *e = &ev->xfocus;
3581
3582         if(e->mode == NotifyGrab)
3583                 return;
3584
3585         if(ev->type == FocusIn) {
3586                 XSetICFocus(xw.xic);
3587                 xw.state |= WIN_FOCUSED;
3588                 xseturgency(0);
3589                 if(IS_SET(MODE_FOCUS))
3590                         ttywrite("\033[I", 3);
3591         } else {
3592                 XUnsetICFocus(xw.xic);
3593                 xw.state &= ~WIN_FOCUSED;
3594                 if(IS_SET(MODE_FOCUS))
3595                         ttywrite("\033[O", 3);
3596         }
3597 }
3598
3599 static inline bool
3600 match(uint mask, uint state) {
3601         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3602 }
3603
3604 void
3605 numlock(const Arg *dummy) {
3606         term.numlock ^= 1;
3607 }
3608
3609 char*
3610 kmap(KeySym k, uint state) {
3611         Key *kp;
3612         int i;
3613
3614         /* Check for mapped keys out of X11 function keys. */
3615         for(i = 0; i < LEN(mappedkeys); i++) {
3616                 if(mappedkeys[i] == k)
3617                         break;
3618         }
3619         if(i == LEN(mappedkeys)) {
3620                 if((k & 0xFFFF) < 0xFD00)
3621                         return NULL;
3622         }
3623
3624         for(kp = key; kp < key + LEN(key); kp++) {
3625                 if(kp->k != k)
3626                         continue;
3627
3628                 if(!match(kp->mask, state))
3629                         continue;
3630
3631                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3632                         continue;
3633                 if(term.numlock && kp->appkey == 2)
3634                         continue;
3635
3636                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3637                         continue;
3638
3639                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3640                         continue;
3641
3642                 return kp->s;
3643         }
3644
3645         return NULL;
3646 }
3647
3648 void
3649 kpress(XEvent *ev) {
3650         XKeyEvent *e = &ev->xkey;
3651         KeySym ksym;
3652         char buf[32], *customkey;
3653         int len;
3654         long c;
3655         Status status;
3656         Shortcut *bp;
3657
3658         if(IS_SET(MODE_KBDLOCK))
3659                 return;
3660
3661         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3662         /* 1. shortcuts */
3663         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3664                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3665                         bp->func(&(bp->arg));
3666                         return;
3667                 }
3668         }
3669
3670         /* 2. custom keys from config.h */
3671         if((customkey = kmap(ksym, e->state))) {
3672                 ttysend(customkey, strlen(customkey));
3673                 return;
3674         }
3675
3676         /* 3. composed string from input method */
3677         if(len == 0)
3678                 return;
3679         if(len == 1 && e->state & Mod1Mask) {
3680                 if(IS_SET(MODE_8BIT)) {
3681                         if(*buf < 0177) {
3682                                 c = *buf | 0x80;
3683                                 len = utf8encode(c, buf, UTF_SIZ);
3684                         }
3685                 } else {
3686                         buf[1] = buf[0];
3687                         buf[0] = '\033';
3688                         len = 2;
3689                 }
3690         }
3691         ttysend(buf, len);
3692 }
3693
3694
3695 void
3696 cmessage(XEvent *e) {
3697         /*
3698          * See xembed specs
3699          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3700          */
3701         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3702                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3703                         xw.state |= WIN_FOCUSED;
3704                         xseturgency(0);
3705                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3706                         xw.state &= ~WIN_FOCUSED;
3707                 }
3708         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3709                 /* Send SIGHUP to shell */
3710                 kill(pid, SIGHUP);
3711                 exit(EXIT_SUCCESS);
3712         }
3713 }
3714
3715 void
3716 cresize(int width, int height) {
3717         int col, row;
3718
3719         if(width != 0)
3720                 xw.w = width;
3721         if(height != 0)
3722                 xw.h = height;
3723
3724         col = (xw.w - 2 * borderpx) / xw.cw;
3725         row = (xw.h - 2 * borderpx) / xw.ch;
3726
3727         tresize(col, row);
3728         xresize(col, row);
3729         ttyresize();
3730 }
3731
3732 void
3733 resize(XEvent *e) {
3734         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3735                 return;
3736
3737         cresize(e->xconfigure.width, e->xconfigure.height);
3738 }
3739
3740 void
3741 run(void) {
3742         XEvent ev;
3743         int w = xw.w, h = xw.h;
3744         fd_set rfd;
3745         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3746         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3747
3748         /* Waiting for window mapping */
3749         while(1) {
3750                 XNextEvent(xw.dpy, &ev);
3751                 if(ev.type == ConfigureNotify) {
3752                         w = ev.xconfigure.width;
3753                         h = ev.xconfigure.height;
3754                 } else if(ev.type == MapNotify) {
3755                         break;
3756                 }
3757         }
3758
3759         ttynew();
3760         cresize(w, h);
3761
3762         gettimeofday(&last, NULL);
3763         lastblink = last;
3764
3765         for(xev = actionfps;;) {
3766                 long deltatime;
3767
3768                 FD_ZERO(&rfd);
3769                 FD_SET(cmdfd, &rfd);
3770                 FD_SET(xfd, &rfd);
3771
3772                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3773                         if(errno == EINTR)
3774                                 continue;
3775                         die("select failed: %s\n", strerror(errno));
3776                 }
3777                 if(FD_ISSET(cmdfd, &rfd)) {
3778                         ttyread();
3779                         if(blinktimeout) {
3780                                 blinkset = tattrset(ATTR_BLINK);
3781                                 if(!blinkset)
3782                                         MODBIT(term.mode, 0, MODE_BLINK);
3783                         }
3784                 }
3785
3786                 if(FD_ISSET(xfd, &rfd))
3787                         xev = actionfps;
3788
3789                 gettimeofday(&now, NULL);
3790                 drawtimeout.tv_sec = 0;
3791                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3792                 tv = &drawtimeout;
3793
3794                 dodraw = 0;
3795                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3796                         tsetdirtattr(ATTR_BLINK);
3797                         term.mode ^= MODE_BLINK;
3798                         lastblink = now;
3799                         dodraw = 1;
3800                 }
3801                 deltatime = TIMEDIFF(now, last);
3802                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3803                                 || deltatime < 0) {
3804                         dodraw = 1;
3805                         last = now;
3806                 }
3807
3808                 if(dodraw) {
3809                         while(XPending(xw.dpy)) {
3810                                 XNextEvent(xw.dpy, &ev);
3811                                 if(XFilterEvent(&ev, None))
3812                                         continue;
3813                                 if(handler[ev.type])
3814                                         (handler[ev.type])(&ev);
3815                         }
3816
3817                         draw();
3818                         XFlush(xw.dpy);
3819
3820                         if(xev && !FD_ISSET(xfd, &rfd))
3821                                 xev--;
3822                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3823                                 if(blinkset) {
3824                                         if(TIMEDIFF(now, lastblink) \
3825                                                         > blinktimeout) {
3826                                                 drawtimeout.tv_usec = 1;
3827                                         } else {
3828                                                 drawtimeout.tv_usec = (1000 * \
3829                                                         (blinktimeout - \
3830                                                         TIMEDIFF(now,
3831                                                                 lastblink)));
3832                                         }
3833                                 } else {
3834                                         tv = NULL;
3835                                 }
3836                         }
3837                 }
3838         }
3839 }
3840
3841 void
3842 usage(void) {
3843         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3844         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3845         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3846 }
3847
3848 int
3849 main(int argc, char *argv[]) {
3850         char *titles;
3851         uint cols = 80, rows = 24;
3852
3853         xw.l = xw.t = 0;
3854         xw.isfixed = False;
3855
3856         ARGBEGIN {
3857         case 'a':
3858                 allowaltscreen = false;
3859                 break;
3860         case 'c':
3861                 opt_class = EARGF(usage());
3862                 break;
3863         case 'e':
3864                 /* eat all remaining arguments */
3865                 if(argc > 1) {
3866                         opt_cmd = &argv[1];
3867                         if(argv[1] != NULL && opt_title == NULL) {
3868                                 titles = xstrdup(argv[1]);
3869                                 opt_title = basename(titles);
3870                         }
3871                 }
3872                 goto run;
3873         case 'f':
3874                 opt_font = EARGF(usage());
3875                 break;
3876         case 'g':
3877                 xw.gm = XParseGeometry(EARGF(usage()),
3878                                 &xw.l, &xw.t, &cols, &rows);
3879                 break;
3880         case 'i':
3881                 xw.isfixed = True;
3882                 break;
3883         case 'o':
3884                 opt_io = EARGF(usage());
3885                 break;
3886         case 't':
3887                 opt_title = EARGF(usage());
3888                 break;
3889         case 'w':
3890                 opt_embed = EARGF(usage());
3891                 break;
3892         case 'v':
3893         default:
3894                 usage();
3895         } ARGEND;
3896
3897 run:
3898         setlocale(LC_CTYPE, "");
3899         XSetLocaleModifiers("");
3900         tnew(cols? cols : 1, rows? rows : 1);
3901         xinit();
3902         selinit();
3903         run();
3904
3905         return 0;
3906 }
3907