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 LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  74 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  75 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  76 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  77 #define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
  78 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  79
  80 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  81 #define IS_TRUECOL(x)    (1 << 24 & (x))
  82 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  83 #define TRUEGREEN(x)     (((x) & 0xff00))
  84 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  85
  86
  87 #define VT102ID "\033[?6c"
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_REVERSE   = 1,
  92         ATTR_UNDERLINE = 2,
  93         ATTR_BOLD      = 4,
  94         ATTR_GFX       = 8,
  95         ATTR_ITALIC    = 16,
  96         ATTR_BLINK     = 32,
  97         ATTR_WRAP      = 64,
  98         ATTR_WIDE      = 128,
  99         ATTR_WDUMMY    = 256,
 100 };
 101
 102 enum cursor_movement {
 103         CURSOR_SAVE,
 104         CURSOR_LOAD
 105 };
 106
 107 enum cursor_state {
 108         CURSOR_DEFAULT  = 0,
 109         CURSOR_WRAPNEXT = 1,
 110         CURSOR_ORIGIN   = 2
 111 };
 112
 113 enum term_mode {
 114         MODE_WRAP        = 1,
 115         MODE_INSERT      = 2,
 116         MODE_APPKEYPAD   = 4,
 117         MODE_ALTSCREEN   = 8,
 118         MODE_CRLF        = 16,
 119         MODE_MOUSEBTN    = 32,
 120         MODE_MOUSEMOTION = 64,
 121         MODE_REVERSE     = 128,
 122         MODE_KBDLOCK     = 256,
 123         MODE_HIDE        = 512,
 124         MODE_ECHO        = 1024,
 125         MODE_APPCURSOR   = 2048,
 126         MODE_MOUSESGR    = 4096,
 127         MODE_8BIT        = 8192,
 128         MODE_BLINK       = 16384,
 129         MODE_FBLINK      = 32768,
 130         MODE_FOCUS       = 65536,
 131         MODE_MOUSEX10    = 131072,
 132         MODE_MOUSEMANY   = 262144,
 133         MODE_BRCKTPASTE  = 524288,
 134         MODE_PRINT       = 1048576,
 135         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 136                           |MODE_MOUSEMANY,
 137 };
 138
 139 enum charset {
 140         CS_GRAPHIC0,
 141         CS_GRAPHIC1,
 142         CS_UK,
 143         CS_USA,
 144         CS_MULTI,
 145         CS_GER,
 146         CS_FIN
 147 };
 148
 149 enum escape_state {
 150         ESC_START      = 1,
 151         ESC_CSI        = 2,
 152         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 153         ESC_ALTCHARSET = 8,
 154         ESC_STR_END    = 16, /* a final string was encountered */
 155         ESC_TEST       = 32, /* Enter in test mode */
 156 };
 157
 158 enum window_state {
 159         WIN_VISIBLE = 1,
 160         WIN_REDRAW  = 2,
 161         WIN_FOCUSED = 4
 162 };
 163
 164 enum selection_type {
 165         SEL_REGULAR = 1,
 166         SEL_RECTANGULAR = 2
 167 };
 168
 169 enum selection_snap {
 170         SNAP_WORD = 1,
 171         SNAP_LINE = 2
 172 };
 173
 174 typedef unsigned char uchar;
 175 typedef unsigned int uint;
 176 typedef unsigned long ulong;
 177 typedef unsigned short ushort;
 178
 179 typedef XftDraw *Draw;
 180 typedef XftColor Colour;
 181 typedef Colormap Colourmap;
 182
 183 typedef struct {
 184         char c[UTF_SIZ]; /* character code */
 185         ushort mode;      /* attribute flags */
 186         uint32_t fg;      /* foreground  */
 187         uint32_t bg;      /* background  */
 188 } Glyph;
 189
 190 typedef Glyph *Line;
 191
 192 typedef struct {
 193         Glyph attr; /* current char attributes */
 194         int x;
 195         int y;
 196         char state;
 197 } TCursor;
 198
 199 /* CSI Escape sequence structs */
 200 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 201 typedef struct {
 202         char buf[ESC_BUF_SIZ]; /* raw string */
 203         int len;               /* raw string length */
 204         char priv;
 205         int arg[ESC_ARG_SIZ];
 206         int narg;              /* nb of args */
 207         char mode;
 208 } CSIEscape;
 209
 210 /* STR Escape sequence structs */
 211 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 212 typedef struct {
 213         char type;             /* ESC type ... */
 214         char buf[STR_BUF_SIZ]; /* raw string */
 215         int len;               /* raw string length */
 216         char *args[STR_ARG_SIZ];
 217         int narg;              /* nb of args */
 218 } STREscape;
 219
 220 /* Internal representation of the screen */
 221 typedef struct {
 222         int row;      /* nb row */
 223         int col;      /* nb col */
 224         Line *line;   /* screen */
 225         Line *alt;    /* alternate screen */
 226         bool *dirty;  /* dirtyness of lines */
 227         TCursor c;    /* cursor */
 228         int top;      /* top    scroll limit */
 229         int bot;      /* bottom scroll limit */
 230         int mode;     /* terminal mode flags */
 231         int esc;      /* escape state flags */
 232         char trantbl[4]; /* charset table translation */
 233         int charset;  /* current charset */
 234         int icharset; /* selected charset for sequence */
 235         bool numlock; /* lock numbers in keyboard */
 236         bool *tabs;
 237 } Term;
 238
 239 /* Purely graphic info */
 240 typedef struct {
 241         Display *dpy;
 242         Colourmap cmap;
 243         Window win;
 244         Drawable buf;
 245         Atom xembed, wmdeletewin, netwmname, netwmpid;
 246         XIM xim;
 247         XIC xic;
 248         Draw draw;
 249         Visual *vis;
 250         XSetWindowAttributes attrs;
 251         int scr;
 252         bool isfixed; /* is fixed geometry? */
 253         int l, t; /* left and top offset */
 254         int gm; /* geometry mask */
 255         int tw, th; /* tty width and height */
 256         int w, h; /* window width and height */
 257         int ch; /* char height */
 258         int cw; /* char width  */
 259         char state; /* focus, redraw, visible */
 260 } XWindow;
 261
 262 typedef struct {
 263         uint b;
 264         uint mask;
 265         char *s;
 266 } Mousekey;
 267
 268 typedef struct {
 269         KeySym k;
 270         uint mask;
 271         char *s;
 272         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 273         signed char appkey;    /* application keypad */
 274         signed char appcursor; /* application cursor */
 275         signed char crlf;      /* crlf mode          */
 276 } Key;
 277
 278 typedef struct {
 279         int mode;
 280         int type;
 281         int snap;
 282         /*
 283          * Selection variables:
 284          * nb – normalized coordinates of the beginning of the selection
 285          * ne – normalized coordinates of the end of the selection
 286          * ob – original coordinates of the beginning of the selection
 287          * oe – original coordinates of the end of the selection
 288          */
 289         struct {
 290                 int x, y;
 291         } nb, ne, ob, oe;
 292
 293         char *clip;
 294         Atom xtarget;
 295         bool alt;
 296         struct timeval tclick1;
 297         struct timeval tclick2;
 298 } Selection;
 299
 300 typedef union {
 301         int i;
 302         uint ui;
 303         float f;
 304         const void *v;
 305 } Arg;
 306
 307 typedef struct {
 308         uint mod;
 309         KeySym keysym;
 310         void (*func)(const Arg *);
 311         const Arg arg;
 312 } Shortcut;
 313
 314 /* function definitions used in config.h */
 315 static void clippaste(const Arg *);
 316 static void numlock(const Arg *);
 317 static void selpaste(const Arg *);
 318 static void xzoom(const Arg *);
 319 static void printsel(const Arg *);
 320 static void printscreen(const Arg *) ;
 321 static void toggleprinter(const Arg *);
 322
 323 /* Config.h for applying patches and the configuration. */
 324 #include "config.h"
 325
 326 /* Font structure */
 327 typedef struct {
 328         int height;
 329         int width;
 330         int ascent;
 331         int descent;
 332         short lbearing;
 333         short rbearing;
 334         XftFont *match;
 335         FcFontSet *set;
 336         FcPattern *pattern;
 337 } Font;
 338
 339 /* Drawing Context */
 340 typedef struct {
 341         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 342         Font font, bfont, ifont, ibfont;
 343         GC gc;
 344 } DC;
 345
 346 static void die(const char *, ...);
 347 static void draw(void);
 348 static void redraw(int);
 349 static void drawregion(int, int, int, int);
 350 static void execsh(void);
 351 static void sigchld(int);
 352 static void run(void);
 353
 354 static void csidump(void);
 355 static void csihandle(void);
 356 static void csiparse(void);
 357 static void csireset(void);
 358 static void strdump(void);
 359 static void strhandle(void);
 360 static void strparse(void);
 361 static void strreset(void);
 362
 363 static int tattrset(int);
 364 static void tprinter(char *, size_t);
 365 static void tdumpsel(void);
 366 static void tdumpline(int);
 367 static void tdump(void);
 368 static void tclearregion(int, int, int, int);
 369 static void tcursor(int);
 370 static void tdeletechar(int);
 371 static void tdeleteline(int);
 372 static void tinsertblank(int);
 373 static void tinsertblankline(int);
 374 static void tmoveto(int, int);
 375 static void tmoveato(int, int);
 376 static void tnew(int, int);
 377 static void tnewline(int);
 378 static void tputtab(int);
 379 static void tputc(char *, int);
 380 static void treset(void);
 381 static int tresize(int, int);
 382 static void tscrollup(int, int);
 383 static void tscrolldown(int, int);
 384 static void tsetattr(int *, int);
 385 static void tsetchar(char *, Glyph *, int, int);
 386 static void tsetscroll(int, int);
 387 static void tswapscreen(void);
 388 static void tsetdirt(int, int);
 389 static void tsetdirtattr(int);
 390 static void tsetmode(bool, bool, int *, int);
 391 static void tfulldirt(void);
 392 static void techo(char *, int);
 393 static int32_t tdefcolor(int *, int *, int);
 394 static void tselcs(void);
 395 static void tdeftran(char);
 396 static inline bool match(uint, uint);
 397 static void ttynew(void);
 398 static void ttyread(void);
 399 static void ttyresize(void);
 400 static void ttysend(char *, size_t);
 401 static void ttywrite(const char *, size_t);
 402
 403 static void xdraws(char *, Glyph, int, int, int, int);
 404 static void xhints(void);
 405 static void xclear(int, int, int, int);
 406 static void xdrawcursor(void);
 407 static void xinit(void);
 408 static void xloadcols(void);
 409 static int xsetcolorname(int, const char *);
 410 static int xgeommasktogravity(int);
 411 static int xloadfont(Font *, FcPattern *);
 412 static void xloadfonts(char *, double);
 413 static int xloadfontset(Font *);
 414 static void xsettitle(char *);
 415 static void xresettitle(void);
 416 static void xsetpointermotion(int);
 417 static void xseturgency(int);
 418 static void xsetsel(char *);
 419 static void xtermclear(int, int, int, int);
 420 static void xunloadfont(Font *);
 421 static void xunloadfonts(void);
 422 static void xresize(int, int);
 423
 424 static void expose(XEvent *);
 425 static void visibility(XEvent *);
 426 static void unmap(XEvent *);
 427 static char *kmap(KeySym, uint);
 428 static void kpress(XEvent *);
 429 static void cmessage(XEvent *);
 430 static void cresize(int, int);
 431 static void resize(XEvent *);
 432 static void focus(XEvent *);
 433 static void brelease(XEvent *);
 434 static void bpress(XEvent *);
 435 static void bmotion(XEvent *);
 436 static void selnotify(XEvent *);
 437 static void selclear(XEvent *);
 438 static void selrequest(XEvent *);
 439
 440 static void selinit(void);
 441 static void selsort(void);
 442 static inline bool selected(int, int);
 443 static char *getsel(void);
 444 static void selcopy(void);
 445 static void selscroll(int, int);
 446 static void selsnap(int, int *, int *, int);
 447
 448 static size_t utf8decode(char *, long *, size_t);
 449 static long utf8decodebyte(char, size_t *);
 450 static size_t utf8encode(long, char *, size_t);
 451 static char utf8encodebyte(long, size_t);
 452 static size_t utf8len(char *);
 453 static size_t utf8validate(long *, size_t);
 454
 455 static ssize_t xwrite(int, const char *, size_t);
 456 static void *xmalloc(size_t);
 457 static void *xrealloc(void *, size_t);
 458 static char *xstrdup(char *);
 459
 460 static void (*handler[LASTEvent])(XEvent *) = {
 461         [KeyPress] = kpress,
 462         [ClientMessage] = cmessage,
 463         [ConfigureNotify] = resize,
 464         [VisibilityNotify] = visibility,
 465         [UnmapNotify] = unmap,
 466         [Expose] = expose,
 467         [FocusIn] = focus,
 468         [FocusOut] = focus,
 469         [MotionNotify] = bmotion,
 470         [ButtonPress] = bpress,
 471         [ButtonRelease] = brelease,
 472         [SelectionClear] = selclear,
 473         [SelectionNotify] = selnotify,
 474         [SelectionRequest] = selrequest,
 475 };
 476
 477 /* Globals */
 478 static DC dc;
 479 static XWindow xw;
 480 static Term term;
 481 static CSIEscape csiescseq;
 482 static STREscape strescseq;
 483 static int cmdfd;
 484 static pid_t pid;
 485 static Selection sel;
 486 static int iofd = STDOUT_FILENO;
 487 static char **opt_cmd = NULL;
 488 static char *opt_io = NULL;
 489 static char *opt_title = NULL;
 490 static char *opt_embed = NULL;
 491 static char *opt_class = NULL;
 492 static char *opt_font = NULL;
 493 static int oldbutton = 3; /* button event on startup: 3 = release */
 494
 495 static char *usedfont = NULL;
 496 static double usedfontsize = 0;
 497
 498 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 499 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 500 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 501 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 502
 503 /* Font Ring Cache */
 504 enum {
 505         FRC_NORMAL,
 506         FRC_ITALIC,
 507         FRC_BOLD,
 508         FRC_ITALICBOLD
 509 };
 510
 511 typedef struct {
 512         XftFont *font;
 513         int flags;
 514 } Fontcache;
 515
 516 /* Fontcache is an array now. A new font will be appended to the array. */
 517 static Fontcache frc[16];
 518 static int frclen = 0;
 519
 520 ssize_t
 521 xwrite(int fd, const char *s, size_t len) {
 522         size_t aux = len;
 523
 524         while(len > 0) {
 525                 ssize_t r = write(fd, s, len);
 526                 if(r < 0)
 527                         return r;
 528                 len -= r;
 529                 s += r;
 530         }
 531         return aux;
 532 }
 533
 534 void *
 535 xmalloc(size_t len) {
 536         void *p = malloc(len);
 537
 538         if(!p)
 539                 die("Out of memory\n");
 540
 541         return p;
 542 }
 543
 544 void *
 545 xrealloc(void *p, size_t len) {
 546         if((p = realloc(p, len)) == NULL)
 547                 die("Out of memory\n");
 548
 549         return p;
 550 }
 551
 552 char *
 553 xstrdup(char *s) {
 554         if((s = strdup(s)) == NULL)
 555                 die("Out of memory\n");
 556
 557         return s;
 558 }
 559
 560 size_t
 561 utf8decode(char *c, long *u, size_t clen) {
 562         size_t i, j, len, type;
 563         long udecoded;
 564
 565         *u = UTF_INVALID;
 566         if(!clen)
 567                 return 0;
 568         udecoded = utf8decodebyte(c[0], &len);
 569         if(!BETWEEN(len, 1, UTF_SIZ))
 570                 return 1;
 571         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 572                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 573                 if(type != 0)
 574                         return j;
 575         }
 576         if(j < len)
 577                 return 0;
 578         *u = udecoded;
 579         utf8validate(u, len);
 580         return len;
 581 }
 582
 583 long
 584 utf8decodebyte(char c, size_t *i) {
 585         for(*i = 0; *i < LEN(utfmask); ++(*i))
 586                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 587                         return (uchar)c & ~utfmask[*i];
 588         return 0;
 589 }
 590
 591 size_t
 592 utf8encode(long u, char *c, size_t clen) {
 593         size_t len, i;
 594
 595         len = utf8validate(&u, 0);
 596         if(clen < len)
 597                 return 0;
 598         for(i = len - 1; i != 0; --i) {
 599                 c[i] = utf8encodebyte(u, 0);
 600                 u >>= 6;
 601         }
 602         c[0] = utf8encodebyte(u, len);
 603         return len;
 604 }
 605
 606 char
 607 utf8encodebyte(long u, size_t i) {
 608         return utfbyte[i] | (u & ~utfmask[i]);
 609 }
 610
 611 size_t
 612 utf8len(char *c) {
 613         return utf8decode(c, &(long){0}, UTF_SIZ);
 614 }
 615
 616 size_t
 617 utf8validate(long *u, size_t i) {
 618         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 619                 *u = UTF_INVALID;
 620         for(i = 1; *u > utfmax[i]; ++i)
 621                 ;
 622         return i;
 623 }
 624
 625 static void
 626 selinit(void) {
 627         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 628         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 629         sel.mode = 0;
 630         sel.ob.x = -1;
 631         sel.clip = NULL;
 632         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 633         if(sel.xtarget == None)
 634                 sel.xtarget = XA_STRING;
 635 }
 636
 637 static int
 638 x2col(int x) {
 639         x -= borderpx;
 640         x /= xw.cw;
 641
 642         return LIMIT(x, 0, term.col-1);
 643 }
 644
 645 static int
 646 y2row(int y) {
 647         y -= borderpx;
 648         y /= xw.ch;
 649
 650         return LIMIT(y, 0, term.row-1);
 651 }
 652
 653 static void
 654 selsort(void) {
 655         if(sel.ob.y == sel.oe.y) {
 656                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 657                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 658         } else {
 659                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 660                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 661         }
 662         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 663         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 664 }
 665
 666 static inline bool
 667 selected(int x, int y) {
 668         if(sel.ne.y == y && sel.nb.y == y)
 669                 return BETWEEN(x, sel.nb.x, sel.ne.x);
 670
 671         if(sel.type == SEL_RECTANGULAR) {
 672                 return ((sel.nb.y <= y && y <= sel.ne.y)
 673                         && (sel.nb.x <= x && x <= sel.ne.x));
 674         }
 675
 676         return ((sel.nb.y < y && y < sel.ne.y)
 677                 || (y == sel.ne.y && x <= sel.ne.x))
 678                 || (y == sel.nb.y && x >= sel.nb.x
 679                         && (x <= sel.ne.x || sel.nb.y != sel.ne.y));
 680 }
 681
 682 void
 683 selsnap(int mode, int *x, int *y, int direction) {
 684         int i;
 685
 686         switch(mode) {
 687         case SNAP_WORD:
 688                 /*
 689                  * Snap around if the word wraps around at the end or
 690                  * beginning of a line.
 691                  */
 692                 for(;;) {
 693                         if(direction < 0 && *x <= 0) {
 694                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 695                                                 & ATTR_WRAP) {
 696                                         *y -= 1;
 697                                         *x = term.col-1;
 698                                 } else {
 699                                         break;
 700                                 }
 701                         }
 702                         if(direction > 0 && *x >= term.col-1) {
 703                                 if(*y < term.row-1 && term.line[*y][*x].mode
 704                                                 & ATTR_WRAP) {
 705                                         *y += 1;
 706                                         *x = 0;
 707                                 } else {
 708                                         break;
 709                                 }
 710                         }
 711
 712                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 713                                 *x += direction;
 714                                 continue;
 715                         }
 716
 717                         if(strchr(worddelimiters,
 718                                         term.line[*y][*x+direction].c[0])) {
 719                                 break;
 720                         }
 721
 722                         *x += direction;
 723                 }
 724                 break;
 725         case SNAP_LINE:
 726                 /*
 727                  * Snap around if the the previous line or the current one
 728                  * has set ATTR_WRAP at its end. Then the whole next or
 729                  * previous line will be selected.
 730                  */
 731                 *x = (direction < 0) ? 0 : term.col - 1;
 732                 if(direction < 0 && *y > 0) {
 733                         for(; *y > 0; *y += direction) {
 734                                 if(!(term.line[*y-1][term.col-1].mode
 735                                                 & ATTR_WRAP)) {
 736                                         break;
 737                                 }
 738                         }
 739                 } else if(direction > 0 && *y < term.row-1) {
 740                         for(; *y < term.row; *y += direction) {
 741                                 if(!(term.line[*y][term.col-1].mode
 742                                                 & ATTR_WRAP)) {
 743                                         break;
 744                                 }
 745                         }
 746                 }
 747                 break;
 748         default:
 749                 /*
 750                  * Select the whole line when the end of line is reached.
 751                  */
 752                 if(direction > 0) {
 753                         i = term.col;
 754                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 755                                 /* nothing */;
 756                         if(i > 0 && i < *x)
 757                                 *x = term.col - 1;
 758                 }
 759                 break;
 760         }
 761 }
 762
 763 void
 764 getbuttoninfo(XEvent *e) {
 765         int type;
 766         uint state = e->xbutton.state &~Button1Mask;
 767
 768         sel.alt = IS_SET(MODE_ALTSCREEN);
 769
 770         sel.oe.x = x2col(e->xbutton.x);
 771         sel.oe.y = y2row(e->xbutton.y);
 772
 773         if(sel.ob.y < sel.oe.y
 774                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 775                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 776                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 777         } else {
 778                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 779                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 780         }
 781         selsort();
 782
 783         sel.type = SEL_REGULAR;
 784         for(type = 1; type < LEN(selmasks); ++type) {
 785                 if(match(selmasks[type], state)) {
 786                         sel.type = type;
 787                         break;
 788                 }
 789         }
 790 }
 791
 792 void
 793 mousereport(XEvent *e) {
 794         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 795             button = e->xbutton.button, state = e->xbutton.state,
 796             len;
 797         char buf[40];
 798         static int ox, oy;
 799
 800         /* from urxvt */
 801         if(e->xbutton.type == MotionNotify) {
 802                 if(x == ox && y == oy)
 803                         return;
 804                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 805                         return;
 806                 /* MOUSE_MOTION: no reporting if no button is pressed */
 807                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 808                         return;
 809
 810                 button = oldbutton + 32;
 811                 ox = x;
 812                 oy = y;
 813         } else {
 814                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 815                         button = 3;
 816                 } else {
 817                         button -= Button1;
 818                         if(button >= 3)
 819                                 button += 64 - 3;
 820                 }
 821                 if(e->xbutton.type == ButtonPress) {
 822                         oldbutton = button;
 823                         ox = x;
 824                         oy = y;
 825                 } else if(e->xbutton.type == ButtonRelease) {
 826                         oldbutton = 3;
 827                         /* MODE_MOUSEX10: no button release reporting */
 828                         if(IS_SET(MODE_MOUSEX10))
 829                                 return;
 830                 }
 831         }
 832
 833         if(!IS_SET(MODE_MOUSEX10)) {
 834                 button += (state & ShiftMask   ? 4  : 0)
 835                         + (state & Mod4Mask    ? 8  : 0)
 836                         + (state & ControlMask ? 16 : 0);
 837         }
 838
 839         len = 0;
 840         if(IS_SET(MODE_MOUSESGR)) {
 841                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 842                                 button, x+1, y+1,
 843                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 844         } else if(x < 223 && y < 223) {
 845                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 846                                 32+button, 32+x+1, 32+y+1);
 847         } else {
 848                 return;
 849         }
 850
 851         ttywrite(buf, len);
 852 }
 853
 854 void
 855 bpress(XEvent *e) {
 856         struct timeval now;
 857         Mousekey *mk;
 858
 859         if(IS_SET(MODE_MOUSE)) {
 860                 mousereport(e);
 861                 return;
 862         }
 863
 864         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 865                 if(e->xbutton.button == mk->b
 866                                 && match(mk->mask, e->xbutton.state)) {
 867                         ttysend(mk->s, strlen(mk->s));
 868                         return;
 869                 }
 870         }
 871
 872         if(e->xbutton.button == Button1) {
 873                 gettimeofday(&now, NULL);
 874
 875                 /* Clear previous selection, logically and visually. */
 876                 selclear(NULL);
 877                 sel.mode = 1;
 878                 sel.type = SEL_REGULAR;
 879                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 880                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 881
 882                 /*
 883                  * If the user clicks below predefined timeouts specific
 884                  * snapping behaviour is exposed.
 885                  */
 886                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 887                         sel.snap = SNAP_LINE;
 888                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 889                         sel.snap = SNAP_WORD;
 890                 } else {
 891                         sel.snap = 0;
 892                 }
 893                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 894                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 895                 selsort();
 896
 897                 /*
 898                  * Draw selection, unless it's regular and we don't want to
 899                  * make clicks visible
 900                  */
 901                 if(sel.snap != 0) {
 902                         sel.mode++;
 903                         tsetdirt(sel.nb.y, sel.ne.y);
 904                 }
 905                 sel.tclick2 = sel.tclick1;
 906                 sel.tclick1 = now;
 907         }
 908 }
 909
 910 char *
 911 getsel(void) {
 912         char *str, *ptr;
 913         int x, y, bufsize, size, i, ex;
 914         Glyph *gp, *last;
 915
 916         if(sel.ob.x == -1) {
 917                 str = NULL;
 918         } else {
 919                 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 920                 ptr = str = xmalloc(bufsize);
 921
 922                 /* append every set & selected glyph to the selection */
 923                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 924                         gp = &term.line[y][0];
 925                         last = &gp[term.col-1];
 926
 927                         while(last >= gp && !(selected(last - gp, y) &&
 928                                               strcmp(last->c, " ") != 0)) {
 929                                 --last;
 930                         }
 931
 932                         for(x = 0; gp <= last; x++, ++gp) {
 933                                 if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 934                                         continue;
 935
 936                                 size = utf8len(gp->c);
 937                                 memcpy(ptr, gp->c, size);
 938                                 ptr += size;
 939                         }
 940
 941                         /*
 942                          * Copy and pasting of line endings is inconsistent
 943                          * in the inconsistent terminal and GUI world.
 944                          * The best solution seems like to produce '\n' when
 945                          * something is copied from st and convert '\n' to
 946                          * '\r', when something to be pasted is received by
 947                          * st.
 948                          * FIXME: Fix the computer world.
 949                          */
 950                         if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
 951                                 *ptr++ = '\n';
 952
 953                         /*
 954                          * If the last selected line expands in the selection
 955                          * after the visible text '\n' is appended.
 956                          */
 957                         if(y == sel.ne.y) {
 958                                 i = term.col;
 959                                 while(--i > 0 && term.line[y][i].c[0] == ' ')
 960                                         /* nothing */;
 961                                 ex = sel.ne.x;
 962                                 if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 963                                         ex = sel.nb.x;
 964                                 if(i < ex)
 965                                         *ptr++ = '\n';
 966                         }
 967                 }
 968                 *ptr = 0;
 969         }
 970         return str;
 971 }
 972
 973 void
 974 selcopy(void) {
 975         xsetsel(getsel());
 976 }
 977
 978 void
 979 selnotify(XEvent *e) {
 980         ulong nitems, ofs, rem;
 981         int format;
 982         uchar *data, *last, *repl;
 983         Atom type;
 984
 985         ofs = 0;
 986         do {
 987                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 988                                         False, AnyPropertyType, &type, &format,
 989                                         &nitems, &rem, &data)) {
 990                         fprintf(stderr, "Clipboard allocation failed\n");
 991                         return;
 992                 }
 993
 994                 /*
 995                  * As seen in getsel:
 996                  * Line endings are inconsistent in the terminal and GUI world
 997                  * copy and pasting. When receiving some selection data,
 998                  * replace all '\n' with '\r'.
 999                  * FIXME: Fix the computer world.
1000                  */
1001                 repl = data;
1002                 last = data + nitems * format / 8;
1003                 while((repl = memchr(repl, '\n', last - repl))) {
1004                         *repl++ = '\r';
1005                 }
1006
1007                 if(IS_SET(MODE_BRCKTPASTE))
1008                         ttywrite("\033[200~", 6);
1009                 ttysend((char *)data, nitems * format / 8);
1010                 if(IS_SET(MODE_BRCKTPASTE))
1011                         ttywrite("\033[201~", 6);
1012                 XFree(data);
1013                 /* number of 32-bit chunks returned */
1014                 ofs += nitems * format / 32;
1015         } while(rem > 0);
1016 }
1017
1018 void
1019 selpaste(const Arg *dummy) {
1020         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1021                         xw.win, CurrentTime);
1022 }
1023
1024 void
1025 clippaste(const Arg *dummy) {
1026         Atom clipboard;
1027
1028         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1029         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1030                         xw.win, CurrentTime);
1031 }
1032
1033 void
1034 selclear(XEvent *e) {
1035         if(sel.ob.x == -1)
1036                 return;
1037         sel.ob.x = -1;
1038         tsetdirt(sel.nb.y, sel.ne.y);
1039 }
1040
1041 void
1042 selrequest(XEvent *e) {
1043         XSelectionRequestEvent *xsre;
1044         XSelectionEvent xev;
1045         Atom xa_targets, string;
1046
1047         xsre = (XSelectionRequestEvent *) e;
1048         xev.type = SelectionNotify;
1049         xev.requestor = xsre->requestor;
1050         xev.selection = xsre->selection;
1051         xev.target = xsre->target;
1052         xev.time = xsre->time;
1053         /* reject */
1054         xev.property = None;
1055
1056         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1057         if(xsre->target == xa_targets) {
1058                 /* respond with the supported type */
1059                 string = sel.xtarget;
1060                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1061                                 XA_ATOM, 32, PropModeReplace,
1062                                 (uchar *) &string, 1);
1063                 xev.property = xsre->property;
1064         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1065                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1066                                 xsre->target, 8, PropModeReplace,
1067                                 (uchar *) sel.clip, strlen(sel.clip));
1068                 xev.property = xsre->property;
1069         }
1070
1071         /* all done, send a notification to the listener */
1072         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1073                 fprintf(stderr, "Error sending SelectionNotify event\n");
1074 }
1075
1076 void
1077 xsetsel(char *str) {
1078         /* register the selection for both the clipboard and the primary */
1079         Atom clipboard;
1080
1081         free(sel.clip);
1082         sel.clip = str;
1083
1084         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1085
1086         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1087         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1088 }
1089
1090 void
1091 brelease(XEvent *e) {
1092         if(IS_SET(MODE_MOUSE)) {
1093                 mousereport(e);
1094                 return;
1095         }
1096
1097         if(e->xbutton.button == Button2) {
1098                 selpaste(NULL);
1099         } else if(e->xbutton.button == Button1) {
1100                 if(sel.mode < 2) {
1101                         selclear(NULL);
1102                 } else {
1103                         getbuttoninfo(e);
1104                         selcopy();
1105                 }
1106                 sel.mode = 0;
1107                 tsetdirt(sel.nb.y, sel.ne.y);
1108         }
1109 }
1110
1111 void
1112 bmotion(XEvent *e) {
1113         int oldey, oldex, oldsby, oldsey;
1114
1115         if(IS_SET(MODE_MOUSE)) {
1116                 mousereport(e);
1117                 return;
1118         }
1119
1120         if(!sel.mode)
1121                 return;
1122
1123         sel.mode++;
1124         oldey = sel.oe.y;
1125         oldex = sel.oe.x;
1126         oldsby = sel.nb.y;
1127         oldsey = sel.ne.y;
1128         getbuttoninfo(e);
1129
1130         if(oldey != sel.oe.y || oldex != sel.oe.x)
1131                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1132 }
1133
1134 void
1135 die(const char *errstr, ...) {
1136         va_list ap;
1137
1138         va_start(ap, errstr);
1139         vfprintf(stderr, errstr, ap);
1140         va_end(ap);
1141         exit(EXIT_FAILURE);
1142 }
1143
1144 void
1145 execsh(void) {
1146         char **args;
1147         char *envshell = getenv("SHELL");
1148         const struct passwd *pass = getpwuid(getuid());
1149         char buf[sizeof(long) * 8 + 1];
1150
1151         unsetenv("COLUMNS");
1152         unsetenv("LINES");
1153         unsetenv("TERMCAP");
1154
1155         if(pass) {
1156                 setenv("LOGNAME", pass->pw_name, 1);
1157                 setenv("USER", pass->pw_name, 1);
1158                 setenv("SHELL", pass->pw_shell, 0);
1159                 setenv("HOME", pass->pw_dir, 0);
1160         }
1161
1162         snprintf(buf, sizeof(buf), "%lu", xw.win);
1163         setenv("WINDOWID", buf, 1);
1164
1165         signal(SIGCHLD, SIG_DFL);
1166         signal(SIGHUP, SIG_DFL);
1167         signal(SIGINT, SIG_DFL);
1168         signal(SIGQUIT, SIG_DFL);
1169         signal(SIGTERM, SIG_DFL);
1170         signal(SIGALRM, SIG_DFL);
1171
1172         DEFAULT(envshell, shell);
1173         setenv("TERM", termname, 1);
1174         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1175         execvp(args[0], args);
1176         exit(EXIT_FAILURE);
1177 }
1178
1179 void
1180 sigchld(int a) {
1181         int stat = 0;
1182
1183         if(waitpid(pid, &stat, 0) < 0)
1184                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1185
1186         if(WIFEXITED(stat)) {
1187                 exit(WEXITSTATUS(stat));
1188         } else {
1189                 exit(EXIT_FAILURE);
1190         }
1191 }
1192
1193 void
1194 ttynew(void) {
1195         int m, s;
1196         struct winsize w = {term.row, term.col, 0, 0};
1197
1198         /* seems to work fine on linux, openbsd and freebsd */
1199         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1200                 die("openpty failed: %s\n", strerror(errno));
1201
1202         switch(pid = fork()) {
1203         case -1:
1204                 die("fork failed\n");
1205                 break;
1206         case 0:
1207                 setsid(); /* create a new process group */
1208                 dup2(s, STDIN_FILENO);
1209                 dup2(s, STDOUT_FILENO);
1210                 dup2(s, STDERR_FILENO);
1211                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1212                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1213                 close(s);
1214                 close(m);
1215                 execsh();
1216                 break;
1217         default:
1218                 close(s);
1219                 cmdfd = m;
1220                 signal(SIGCHLD, sigchld);
1221                 if(opt_io) {
1222                         term.mode |= MODE_PRINT;
1223                         iofd = (!strcmp(opt_io, "-")) ?
1224                                   STDOUT_FILENO :
1225                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1226                         if(iofd < 0) {
1227                                 fprintf(stderr, "Error opening %s:%s\n",
1228                                         opt_io, strerror(errno));
1229                         }
1230                 }
1231                 break;
1232         }
1233 }
1234
1235 void
1236 dump(char c) {
1237         static int col;
1238
1239         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1240         if(++col % 10 == 0)
1241                 fprintf(stderr, "\n");
1242 }
1243
1244 void
1245 ttyread(void) {
1246         static char buf[BUFSIZ];
1247         static int buflen = 0;
1248         char *ptr;
1249         char s[UTF_SIZ];
1250         int charsize; /* size of utf8 char in bytes */
1251         long unicodep;
1252         int ret;
1253
1254         /* append read bytes to unprocessed bytes */
1255         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1256                 die("Couldn't read from shell: %s\n", strerror(errno));
1257
1258         /* process every complete utf8 char */
1259         buflen += ret;
1260         ptr = buf;
1261         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1262                 utf8encode(unicodep, s, UTF_SIZ);
1263                 tputc(s, charsize);
1264                 ptr += charsize;
1265                 buflen -= charsize;
1266         }
1267
1268         /* keep any uncomplete utf8 char for the next call */
1269         memmove(buf, ptr, buflen);
1270 }
1271
1272 void
1273 ttywrite(const char *s, size_t n) {
1274         if(xwrite(cmdfd, s, n) == -1)
1275                 die("write error on tty: %s\n", strerror(errno));
1276 }
1277
1278 void
1279 ttysend(char *s, size_t n) {
1280         ttywrite(s, n);
1281         if(IS_SET(MODE_ECHO))
1282                 techo(s, n);
1283 }
1284
1285 void
1286 ttyresize(void) {
1287         struct winsize w;
1288
1289         w.ws_row = term.row;
1290         w.ws_col = term.col;
1291         w.ws_xpixel = xw.tw;
1292         w.ws_ypixel = xw.th;
1293         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1294                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1295 }
1296
1297 int
1298 tattrset(int attr) {
1299         int i, j;
1300
1301         for(i = 0; i < term.row-1; i++) {
1302                 for(j = 0; j < term.col-1; j++) {
1303                         if(term.line[i][j].mode & attr)
1304                                 return 1;
1305                 }
1306         }
1307
1308         return 0;
1309 }
1310
1311 void
1312 tsetdirt(int top, int bot) {
1313         int i;
1314
1315         LIMIT(top, 0, term.row-1);
1316         LIMIT(bot, 0, term.row-1);
1317
1318         for(i = top; i <= bot; i++)
1319                 term.dirty[i] = 1;
1320 }
1321
1322 void
1323 tsetdirtattr(int attr) {
1324         int i, j;
1325
1326         for(i = 0; i < term.row-1; i++) {
1327                 for(j = 0; j < term.col-1; j++) {
1328                         if(term.line[i][j].mode & attr) {
1329                                 tsetdirt(i, i);
1330                                 break;
1331                         }
1332                 }
1333         }
1334 }
1335
1336 void
1337 tfulldirt(void) {
1338         tsetdirt(0, term.row-1);
1339 }
1340
1341 void
1342 tcursor(int mode) {
1343         static TCursor c[2];
1344         bool alt = IS_SET(MODE_ALTSCREEN);
1345
1346         if(mode == CURSOR_SAVE) {
1347                 c[alt] = term.c;
1348         } else if(mode == CURSOR_LOAD) {
1349                 term.c = c[alt];
1350                 tmoveto(c[alt].x, c[alt].y);
1351         }
1352 }
1353
1354 void
1355 treset(void) {
1356         uint i;
1357
1358         term.c = (TCursor){{
1359                 .mode = ATTR_NULL,
1360                 .fg = defaultfg,
1361                 .bg = defaultbg
1362         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1363
1364         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1365         for(i = tabspaces; i < term.col; i += tabspaces)
1366                 term.tabs[i] = 1;
1367         term.top = 0;
1368         term.bot = term.row - 1;
1369         term.mode = MODE_WRAP;
1370         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1371         term.charset = 0;
1372
1373         tclearregion(0, 0, term.col-1, term.row-1);
1374         tmoveto(0, 0);
1375         tcursor(CURSOR_SAVE);
1376 }
1377
1378 void
1379 tnew(int col, int row) {
1380         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1381         tresize(col, row);
1382         term.numlock = 1;
1383
1384         treset();
1385 }
1386
1387 void
1388 tswapscreen(void) {
1389         Line *tmp = term.line;
1390
1391         term.line = term.alt;
1392         term.alt = tmp;
1393         term.mode ^= MODE_ALTSCREEN;
1394         tfulldirt();
1395 }
1396
1397 void
1398 tscrolldown(int orig, int n) {
1399         int i;
1400         Line temp;
1401
1402         LIMIT(n, 0, term.bot-orig+1);
1403
1404         tsetdirt(orig, term.bot-n);
1405         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1406
1407         for(i = term.bot; i >= orig+n; i--) {
1408                 temp = term.line[i];
1409                 term.line[i] = term.line[i-n];
1410                 term.line[i-n] = temp;
1411         }
1412
1413         selscroll(orig, n);
1414 }
1415
1416 void
1417 tscrollup(int orig, int n) {
1418         int i;
1419         Line temp;
1420
1421         LIMIT(n, 0, term.bot-orig+1);
1422
1423         tclearregion(0, orig, term.col-1, orig+n-1);
1424         tsetdirt(orig+n, term.bot);
1425
1426         for(i = orig; i <= term.bot-n; i++) {
1427                 temp = term.line[i];
1428                 term.line[i] = term.line[i+n];
1429                 term.line[i+n] = temp;
1430         }
1431
1432         selscroll(orig, -n);
1433 }
1434
1435 void
1436 selscroll(int orig, int n) {
1437         if(sel.ob.x == -1)
1438                 return;
1439
1440         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1441                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1442                         selclear(NULL);
1443                         return;
1444                 }
1445                 if(sel.type == SEL_RECTANGULAR) {
1446                         if(sel.ob.y < term.top)
1447                                 sel.ob.y = term.top;
1448                         if(sel.oe.y > term.bot)
1449                                 sel.oe.y = term.bot;
1450                 } else {
1451                         if(sel.ob.y < term.top) {
1452                                 sel.ob.y = term.top;
1453                                 sel.ob.x = 0;
1454                         }
1455                         if(sel.oe.y > term.bot) {
1456                                 sel.oe.y = term.bot;
1457                                 sel.oe.x = term.col;
1458                         }
1459                 }
1460                 selsort();
1461         }
1462 }
1463
1464 void
1465 tnewline(int first_col) {
1466         int y = term.c.y;
1467
1468         if(y == term.bot) {
1469                 tscrollup(term.top, 1);
1470         } else {
1471                 y++;
1472         }
1473         tmoveto(first_col ? 0 : term.c.x, y);
1474 }
1475
1476 void
1477 csiparse(void) {
1478         char *p = csiescseq.buf, *np;
1479         long int v;
1480
1481         csiescseq.narg = 0;
1482         if(*p == '?') {
1483                 csiescseq.priv = 1;
1484                 p++;
1485         }
1486
1487         csiescseq.buf[csiescseq.len] = '\0';
1488         while(p < csiescseq.buf+csiescseq.len) {
1489                 np = NULL;
1490                 v = strtol(p, &np, 10);
1491                 if(np == p)
1492                         v = 0;
1493                 if(v == LONG_MAX || v == LONG_MIN)
1494                         v = -1;
1495                 csiescseq.arg[csiescseq.narg++] = v;
1496                 p = np;
1497                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1498                         break;
1499                 p++;
1500         }
1501         csiescseq.mode = *p;
1502 }
1503
1504 /* for absolute user moves, when decom is set */
1505 void
1506 tmoveato(int x, int y) {
1507         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1508 }
1509
1510 void
1511 tmoveto(int x, int y) {
1512         int miny, maxy;
1513
1514         if(term.c.state & CURSOR_ORIGIN) {
1515                 miny = term.top;
1516                 maxy = term.bot;
1517         } else {
1518                 miny = 0;
1519                 maxy = term.row - 1;
1520         }
1521         LIMIT(x, 0, term.col-1);
1522         LIMIT(y, miny, maxy);
1523         term.c.state &= ~CURSOR_WRAPNEXT;
1524         term.c.x = x;
1525         term.c.y = y;
1526 }
1527
1528 void
1529 tsetchar(char *c, Glyph *attr, int x, int y) {
1530         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1531                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1532                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1533                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1534                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1535                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1536                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1537                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1538                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1539         };
1540
1541         /*
1542          * The table is proudly stolen from rxvt.
1543          */
1544         if(attr->mode & ATTR_GFX) {
1545                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1546                         c = vt100_0[c[0] - 0x41];
1547                 }
1548         }
1549
1550         if(term.line[y][x].mode & ATTR_WIDE) {
1551                 if(x+1 < term.col) {
1552                         term.line[y][x+1].c[0] = ' ';
1553                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1554                 }
1555         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1556                 term.line[y][x-1].c[0] = ' ';
1557                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1558         }
1559
1560         term.dirty[y] = 1;
1561         term.line[y][x] = *attr;
1562         memcpy(term.line[y][x].c, c, UTF_SIZ);
1563 }
1564
1565 void
1566 tclearregion(int x1, int y1, int x2, int y2) {
1567         int x, y, temp;
1568
1569         if(x1 > x2)
1570                 temp = x1, x1 = x2, x2 = temp;
1571         if(y1 > y2)
1572                 temp = y1, y1 = y2, y2 = temp;
1573
1574         LIMIT(x1, 0, term.col-1);
1575         LIMIT(x2, 0, term.col-1);
1576         LIMIT(y1, 0, term.row-1);
1577         LIMIT(y2, 0, term.row-1);
1578
1579         for(y = y1; y <= y2; y++) {
1580                 term.dirty[y] = 1;
1581                 for(x = x1; x <= x2; x++) {
1582                         if(selected(x, y))
1583                                 selclear(NULL);
1584                         term.line[y][x] = term.c.attr;
1585                         memcpy(term.line[y][x].c, " ", 2);
1586                 }
1587         }
1588 }
1589
1590 void
1591 tdeletechar(int n) {
1592         int dst, src, size;
1593         Glyph *line;
1594
1595         LIMIT(n, 0, term.col - term.c.x);
1596
1597         dst = term.c.x;
1598         src = term.c.x + n;
1599         size = term.col - src;
1600         line = term.line[term.c.y];
1601
1602         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1603         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1604 }
1605
1606 void
1607 tinsertblank(int n) {
1608         int dst, src, size;
1609         Glyph *line;
1610
1611         LIMIT(n, 0, term.col - term.c.x);
1612
1613         dst = term.c.x + n;
1614         src = term.c.x;
1615         size = term.col - dst;
1616         line = term.line[term.c.y];
1617
1618         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1619         tclearregion(src, term.c.y, dst - 1, term.c.y);
1620 }
1621
1622 void
1623 tinsertblankline(int n) {
1624         if(BETWEEN(term.c.y, term.top, term.bot))
1625                 tscrolldown(term.c.y, n);
1626 }
1627
1628 void
1629 tdeleteline(int n) {
1630         if(BETWEEN(term.c.y, term.top, term.bot))
1631                 tscrollup(term.c.y, n);
1632 }
1633
1634 int32_t
1635 tdefcolor(int *attr, int *npar, int l) {
1636         int32_t idx = -1;
1637         uint r, g, b;
1638
1639         switch (attr[*npar + 1]) {
1640         case 2: /* direct colour in RGB space */
1641                 if (*npar + 4 >= l) {
1642                         fprintf(stderr,
1643                                 "erresc(38): Incorrect number of parameters (%d)\n",
1644                                 *npar);
1645                         break;
1646                 }
1647                 r = attr[*npar + 2];
1648                 g = attr[*npar + 3];
1649                 b = attr[*npar + 4];
1650                 *npar += 4;
1651                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1652                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1653                                 r, g, b);
1654                 else
1655                         idx = TRUECOLOR(r, g, b);
1656                 break;
1657         case 5: /* indexed colour */
1658                 if (*npar + 2 >= l) {
1659                         fprintf(stderr,
1660                                 "erresc(38): Incorrect number of parameters (%d)\n",
1661                                 *npar);
1662                         break;
1663                 }
1664                 *npar += 2;
1665                 if(!BETWEEN(attr[*npar], 0, 255))
1666                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1667                 else
1668                         idx = attr[*npar];
1669                 break;
1670         case 0: /* implemented defined (only foreground) */
1671         case 1: /* transparent */
1672         case 3: /* direct colour in CMY space */
1673         case 4: /* direct colour in CMYK space */
1674         default:
1675                 fprintf(stderr,
1676                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1677                 break;
1678         }
1679
1680         return idx;
1681 }
1682
1683 void
1684 tsetattr(int *attr, int l) {
1685         int i;
1686         int32_t idx;
1687
1688         for(i = 0; i < l; i++) {
1689                 switch(attr[i]) {
1690                 case 0:
1691                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1692                                         | ATTR_BOLD | ATTR_ITALIC \
1693                                         | ATTR_BLINK);
1694                         term.c.attr.fg = defaultfg;
1695                         term.c.attr.bg = defaultbg;
1696                         break;
1697                 case 1:
1698                         term.c.attr.mode |= ATTR_BOLD;
1699                         break;
1700                 case 3:
1701                         term.c.attr.mode |= ATTR_ITALIC;
1702                         break;
1703                 case 4:
1704                         term.c.attr.mode |= ATTR_UNDERLINE;
1705                         break;
1706                 case 5: /* slow blink */
1707                 case 6: /* rapid blink */
1708                         term.c.attr.mode |= ATTR_BLINK;
1709                         break;
1710                 case 7:
1711                         term.c.attr.mode |= ATTR_REVERSE;
1712                         break;
1713                 case 21:
1714                 case 22:
1715                         term.c.attr.mode &= ~ATTR_BOLD;
1716                         break;
1717                 case 23:
1718                         term.c.attr.mode &= ~ATTR_ITALIC;
1719                         break;
1720                 case 24:
1721                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1722                         break;
1723                 case 25:
1724                 case 26:
1725                         term.c.attr.mode &= ~ATTR_BLINK;
1726                         break;
1727                 case 27:
1728                         term.c.attr.mode &= ~ATTR_REVERSE;
1729                         break;
1730                 case 38:
1731                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1732                                 term.c.attr.fg = idx;
1733                         break;
1734                 case 39:
1735                         term.c.attr.fg = defaultfg;
1736                         break;
1737                 case 48:
1738                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1739                                 term.c.attr.bg = idx;
1740                         break;
1741                 case 49:
1742                         term.c.attr.bg = defaultbg;
1743                         break;
1744                 default:
1745                         if(BETWEEN(attr[i], 30, 37)) {
1746                                 term.c.attr.fg = attr[i] - 30;
1747                         } else if(BETWEEN(attr[i], 40, 47)) {
1748                                 term.c.attr.bg = attr[i] - 40;
1749                         } else if(BETWEEN(attr[i], 90, 97)) {
1750                                 term.c.attr.fg = attr[i] - 90 + 8;
1751                         } else if(BETWEEN(attr[i], 100, 107)) {
1752                                 term.c.attr.bg = attr[i] - 100 + 8;
1753                         } else {
1754                                 fprintf(stderr,
1755                                         "erresc(default): gfx attr %d unknown\n",
1756                                         attr[i]), csidump();
1757                         }
1758                         break;
1759                 }
1760         }
1761 }
1762
1763 void
1764 tsetscroll(int t, int b) {
1765         int temp;
1766
1767         LIMIT(t, 0, term.row-1);
1768         LIMIT(b, 0, term.row-1);
1769         if(t > b) {
1770                 temp = t;
1771                 t = b;
1772                 b = temp;
1773         }
1774         term.top = t;
1775         term.bot = b;
1776 }
1777
1778 void
1779 tsetmode(bool priv, bool set, int *args, int narg) {
1780         int *lim, mode;
1781         bool alt;
1782
1783         for(lim = args + narg; args < lim; ++args) {
1784                 if(priv) {
1785                         switch(*args) {
1786                         case 1: /* DECCKM -- Cursor key */
1787                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1788                                 break;
1789                         case 5: /* DECSCNM -- Reverse video */
1790                                 mode = term.mode;
1791                                 MODBIT(term.mode, set, MODE_REVERSE);
1792                                 if(mode != term.mode)
1793                                         redraw(REDRAW_TIMEOUT);
1794                                 break;
1795                         case 6: /* DECOM -- Origin */
1796                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1797                                 tmoveato(0, 0);
1798                                 break;
1799                         case 7: /* DECAWM -- Auto wrap */
1800                                 MODBIT(term.mode, set, MODE_WRAP);
1801                                 break;
1802                         case 0:  /* Error (IGNORED) */
1803                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1804                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1805                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1806                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1807                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1808                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1809                         case 42: /* DECNRCM -- National characters (IGNORED) */
1810                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1811                                 break;
1812                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1813                                 MODBIT(term.mode, !set, MODE_HIDE);
1814                                 break;
1815                         case 9:    /* X10 mouse compatibility mode */
1816                                 xsetpointermotion(0);
1817                                 MODBIT(term.mode, 0, MODE_MOUSE);
1818                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1819                                 break;
1820                         case 1000: /* 1000: report button press */
1821                                 xsetpointermotion(0);
1822                                 MODBIT(term.mode, 0, MODE_MOUSE);
1823                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1824                                 break;
1825                         case 1002: /* 1002: report motion on button press */
1826                                 xsetpointermotion(0);
1827                                 MODBIT(term.mode, 0, MODE_MOUSE);
1828                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1829                                 break;
1830                         case 1003: /* 1003: enable all mouse motions */
1831                                 xsetpointermotion(set);
1832                                 MODBIT(term.mode, 0, MODE_MOUSE);
1833                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1834                                 break;
1835                         case 1004: /* 1004: send focus events to tty */
1836                                 MODBIT(term.mode, set, MODE_FOCUS);
1837                                 break;
1838                         case 1006: /* 1006: extended reporting mode */
1839                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1840                                 break;
1841                         case 1034:
1842                                 MODBIT(term.mode, set, MODE_8BIT);
1843                                 break;
1844                         case 1049: /* swap screen & set/restore cursor as xterm */
1845                                 if (!allowaltscreen)
1846                                         break;
1847                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1848                                 /* FALLTHRU */
1849                         case 47: /* swap screen */
1850                         case 1047:
1851                                 if (!allowaltscreen)
1852                                         break;
1853                                 alt = IS_SET(MODE_ALTSCREEN);
1854                                 if(alt) {
1855                                         tclearregion(0, 0, term.col-1,
1856                                                         term.row-1);
1857                                 }
1858                                 if(set ^ alt) /* set is always 1 or 0 */
1859                                         tswapscreen();
1860                                 if(*args != 1049)
1861                                         break;
1862                                 /* FALLTRU */
1863                         case 1048:
1864                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1865                                 break;
1866                         case 2004: /* 2004: bracketed paste mode */
1867                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1868                                 break;
1869                         /* Not implemented mouse modes. See comments there. */
1870                         case 1001: /* mouse highlight mode; can hang the
1871                                       terminal by design when implemented. */
1872                         case 1005: /* UTF-8 mouse mode; will confuse
1873                                       applications not supporting UTF-8
1874                                       and luit. */
1875                         case 1015: /* urxvt mangled mouse mode; incompatible
1876                                       and can be mistaken for other control
1877                                       codes. */
1878                         default:
1879                                 fprintf(stderr,
1880                                         "erresc: unknown private set/reset mode %d\n",
1881                                         *args);
1882                                 break;
1883                         }
1884                 } else {
1885                         switch(*args) {
1886                         case 0:  /* Error (IGNORED) */
1887                                 break;
1888                         case 2:  /* KAM -- keyboard action */
1889                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1890                                 break;
1891                         case 4:  /* IRM -- Insertion-replacement */
1892                                 MODBIT(term.mode, set, MODE_INSERT);
1893                                 break;
1894                         case 12: /* SRM -- Send/Receive */
1895                                 MODBIT(term.mode, !set, MODE_ECHO);
1896                                 break;
1897                         case 20: /* LNM -- Linefeed/new line */
1898                                 MODBIT(term.mode, set, MODE_CRLF);
1899                                 break;
1900                         default:
1901                                 fprintf(stderr,
1902                                         "erresc: unknown set/reset mode %d\n",
1903                                         *args);
1904                                 break;
1905                         }
1906                 }
1907         }
1908 }
1909
1910 void
1911 csihandle(void) {
1912         char buf[40];
1913         int len;
1914
1915         switch(csiescseq.mode) {
1916         default:
1917         unknown:
1918                 fprintf(stderr, "erresc: unknown csi ");
1919                 csidump();
1920                 /* die(""); */
1921                 break;
1922         case '@': /* ICH -- Insert <n> blank char */
1923                 DEFAULT(csiescseq.arg[0], 1);
1924                 tinsertblank(csiescseq.arg[0]);
1925                 break;
1926         case 'A': /* CUU -- Cursor <n> Up */
1927                 DEFAULT(csiescseq.arg[0], 1);
1928                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1929                 break;
1930         case 'B': /* CUD -- Cursor <n> Down */
1931         case 'e': /* VPR --Cursor <n> Down */
1932                 DEFAULT(csiescseq.arg[0], 1);
1933                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1934                 break;
1935         case 'i': /* MC -- Media Copy */
1936                 switch(csiescseq.arg[0]) {
1937                 case 0:
1938                         tdump();
1939                         break;
1940                 case 1:
1941                         tdumpline(term.c.y);
1942                         break;
1943                 case 2:
1944                         tdumpsel();
1945                         break;
1946                 case 4:
1947                         term.mode &= ~MODE_PRINT;
1948                         break;
1949                 case 5:
1950                         term.mode |= MODE_PRINT;
1951                         break;
1952                 }
1953                 break;
1954         case 'c': /* DA -- Device Attributes */
1955                 if(csiescseq.arg[0] == 0)
1956                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1957                 break;
1958         case 'C': /* CUF -- Cursor <n> Forward */
1959         case 'a': /* HPR -- Cursor <n> Forward */
1960                 DEFAULT(csiescseq.arg[0], 1);
1961                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1962                 break;
1963         case 'D': /* CUB -- Cursor <n> Backward */
1964                 DEFAULT(csiescseq.arg[0], 1);
1965                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1966                 break;
1967         case 'E': /* CNL -- Cursor <n> Down and first col */
1968                 DEFAULT(csiescseq.arg[0], 1);
1969                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1970                 break;
1971         case 'F': /* CPL -- Cursor <n> Up and first col */
1972                 DEFAULT(csiescseq.arg[0], 1);
1973                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1974                 break;
1975         case 'g': /* TBC -- Tabulation clear */
1976                 switch(csiescseq.arg[0]) {
1977                 case 0: /* clear current tab stop */
1978                         term.tabs[term.c.x] = 0;
1979                         break;
1980                 case 3: /* clear all the tabs */
1981                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1982                         break;
1983                 default:
1984                         goto unknown;
1985                 }
1986                 break;
1987         case 'G': /* CHA -- Move to <col> */
1988         case '`': /* HPA */
1989                 DEFAULT(csiescseq.arg[0], 1);
1990                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1991                 break;
1992         case 'H': /* CUP -- Move to <row> <col> */
1993         case 'f': /* HVP */
1994                 DEFAULT(csiescseq.arg[0], 1);
1995                 DEFAULT(csiescseq.arg[1], 1);
1996                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1997                 break;
1998         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1999                 DEFAULT(csiescseq.arg[0], 1);
2000                 tputtab(csiescseq.arg[0]);
2001                 break;
2002         case 'J': /* ED -- Clear screen */
2003                 selclear(NULL);
2004                 switch(csiescseq.arg[0]) {
2005                 case 0: /* below */
2006                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2007                         if(term.c.y < term.row-1) {
2008                                 tclearregion(0, term.c.y+1, term.col-1,
2009                                                 term.row-1);
2010                         }
2011                         break;
2012                 case 1: /* above */
2013                         if(term.c.y > 1)
2014                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2015                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2016                         break;
2017                 case 2: /* all */
2018                         tclearregion(0, 0, term.col-1, term.row-1);
2019                         break;
2020                 default:
2021                         goto unknown;
2022                 }
2023                 break;
2024         case 'K': /* EL -- Clear line */
2025                 switch(csiescseq.arg[0]) {
2026                 case 0: /* right */
2027                         tclearregion(term.c.x, term.c.y, term.col-1,
2028                                         term.c.y);
2029                         break;
2030                 case 1: /* left */
2031                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2032                         break;
2033                 case 2: /* all */
2034                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2035                         break;
2036                 }
2037                 break;
2038         case 'S': /* SU -- Scroll <n> line up */
2039                 DEFAULT(csiescseq.arg[0], 1);
2040                 tscrollup(term.top, csiescseq.arg[0]);
2041                 break;
2042         case 'T': /* SD -- Scroll <n> line down */
2043                 DEFAULT(csiescseq.arg[0], 1);
2044                 tscrolldown(term.top, csiescseq.arg[0]);
2045                 break;
2046         case 'L': /* IL -- Insert <n> blank lines */
2047                 DEFAULT(csiescseq.arg[0], 1);
2048                 tinsertblankline(csiescseq.arg[0]);
2049                 break;
2050         case 'l': /* RM -- Reset Mode */
2051                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2052                 break;
2053         case 'M': /* DL -- Delete <n> lines */
2054                 DEFAULT(csiescseq.arg[0], 1);
2055                 tdeleteline(csiescseq.arg[0]);
2056                 break;
2057         case 'X': /* ECH -- Erase <n> char */
2058                 DEFAULT(csiescseq.arg[0], 1);
2059                 tclearregion(term.c.x, term.c.y,
2060                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2061                 break;
2062         case 'P': /* DCH -- Delete <n> char */
2063                 DEFAULT(csiescseq.arg[0], 1);
2064                 tdeletechar(csiescseq.arg[0]);
2065                 break;
2066         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2067                 DEFAULT(csiescseq.arg[0], 1);
2068                 tputtab(-csiescseq.arg[0]);
2069                 break;
2070         case 'd': /* VPA -- Move to <row> */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2073                 break;
2074         case 'h': /* SM -- Set terminal mode */
2075                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2076                 break;
2077         case 'm': /* SGR -- Terminal attribute (color) */
2078                 tsetattr(csiescseq.arg, csiescseq.narg);
2079                 break;
2080         case 'n': /* DSR – Device Status Report (cursor position) */
2081                 if (csiescseq.arg[0] == 6) {
2082                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2083                                         term.c.y+1, term.c.x+1);
2084                         ttywrite(buf, len);
2085                         break;
2086                 }
2087         case 'r': /* DECSTBM -- Set Scrolling Region */
2088                 if(csiescseq.priv) {
2089                         goto unknown;
2090                 } else {
2091                         DEFAULT(csiescseq.arg[0], 1);
2092                         DEFAULT(csiescseq.arg[1], term.row);
2093                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2094                         tmoveato(0, 0);
2095                 }
2096                 break;
2097         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2098                 tcursor(CURSOR_SAVE);
2099                 break;
2100         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2101                 tcursor(CURSOR_LOAD);
2102                 break;
2103         }
2104 }
2105
2106 void
2107 csidump(void) {
2108         int i;
2109         uint c;
2110
2111         printf("ESC[");
2112         for(i = 0; i < csiescseq.len; i++) {
2113                 c = csiescseq.buf[i] & 0xff;
2114                 if(isprint(c)) {
2115                         putchar(c);
2116                 } else if(c == '\n') {
2117                         printf("(\\n)");
2118                 } else if(c == '\r') {
2119                         printf("(\\r)");
2120                 } else if(c == 0x1b) {
2121                         printf("(\\e)");
2122                 } else {
2123                         printf("(%02x)", c);
2124                 }
2125         }
2126         putchar('\n');
2127 }
2128
2129 void
2130 csireset(void) {
2131         memset(&csiescseq, 0, sizeof(csiescseq));
2132 }
2133
2134 void
2135 strhandle(void) {
2136         char *p = NULL;
2137         int j, narg, par;
2138
2139         strparse();
2140         narg = strescseq.narg;
2141         par = atoi(strescseq.args[0]);
2142
2143         switch(strescseq.type) {
2144         case ']': /* OSC -- Operating System Command */
2145                 switch(par) {
2146                 case 0:
2147                 case 1:
2148                 case 2:
2149                         if(narg > 1)
2150                                 xsettitle(strescseq.args[1]);
2151                         return;
2152                 case 4: /* color set */
2153                         if(narg < 3)
2154                                 break;
2155                         p = strescseq.args[2];
2156                         /* fall through */
2157                 case 104: /* color reset, here p = NULL */
2158                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2159                         if (!xsetcolorname(j, p)) {
2160                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2161                         } else {
2162                                 /*
2163                                  * TODO if defaultbg color is changed, borders
2164                                  * are dirty
2165                                  */
2166                                 redraw(0);
2167                         }
2168                         return;
2169                 }
2170                 break;
2171         case 'k': /* old title set compatibility */
2172                 xsettitle(strescseq.args[0]);
2173                 return;
2174         case 'P': /* DCS -- Device Control String */
2175         case '_': /* APC -- Application Program Command */
2176         case '^': /* PM -- Privacy Message */
2177                 return;
2178         }
2179
2180         fprintf(stderr, "erresc: unknown str ");
2181         strdump();
2182 }
2183
2184 void
2185 strparse(void) {
2186         char *p = strescseq.buf;
2187
2188         strescseq.narg = 0;
2189         strescseq.buf[strescseq.len] = '\0';
2190         while(p && strescseq.narg < STR_ARG_SIZ)
2191                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2192 }
2193
2194 void
2195 strdump(void) {
2196         int i;
2197         uint c;
2198
2199         printf("ESC%c", strescseq.type);
2200         for(i = 0; i < strescseq.len; i++) {
2201                 c = strescseq.buf[i] & 0xff;
2202                 if(c == '\0') {
2203                         return;
2204                 } else if(isprint(c)) {
2205                         putchar(c);
2206                 } else if(c == '\n') {
2207                         printf("(\\n)");
2208                 } else if(c == '\r') {
2209                         printf("(\\r)");
2210                 } else if(c == 0x1b) {
2211                         printf("(\\e)");
2212                 } else {
2213                         printf("(%02x)", c);
2214                 }
2215         }
2216         printf("ESC\\\n");
2217 }
2218
2219 void
2220 strreset(void) {
2221         memset(&strescseq, 0, sizeof(strescseq));
2222 }
2223
2224 void
2225 tprinter(char *s, size_t len) {
2226         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2227                 fprintf(stderr, "Error writing in %s:%s\n",
2228                         opt_io, strerror(errno));
2229                 close(iofd);
2230                 iofd = -1;
2231         }
2232 }
2233
2234 void
2235 toggleprinter(const Arg *arg) {
2236         term.mode ^= MODE_PRINT;
2237 }
2238
2239 void
2240 printscreen(const Arg *arg) {
2241         tdump();
2242 }
2243
2244 void
2245 printsel(const Arg *arg) {
2246         tdumpsel();
2247 }
2248
2249 void
2250 tdumpsel(void) {
2251         char *ptr;
2252
2253         if((ptr = getsel())) {
2254                 tprinter(ptr, strlen(ptr));
2255                 free(ptr);
2256         }
2257 }
2258
2259 void
2260 tdumpline(int n) {
2261         Glyph *bp, *end;
2262
2263         bp = &term.line[n][0];
2264         end = &bp[term.col-1];
2265         while(end > bp && !strcmp(" ", end->c))
2266                 --end;
2267         if(bp != end || strcmp(bp->c, " ")) {
2268                 for( ;bp <= end; ++bp)
2269                         tprinter(bp->c, strlen(bp->c));
2270         }
2271         tprinter("\n", 1);
2272 }
2273
2274 void
2275 tdump(void) {
2276         int i;
2277
2278         for(i = 0; i < term.row; ++i)
2279                 tdumpline(i);
2280 }
2281
2282 void
2283 tputtab(int n) {
2284         uint x = term.c.x;
2285
2286         if(n > 0) {
2287                 while(x < term.col && n--)
2288                         for(++x; x < term.col && !term.tabs[x]; ++x)
2289                                 /* nothing */ ;
2290         } else if(n < 0) {
2291                 while(x > 0 && n++)
2292                         for(--x; x > 0 && !term.tabs[x]; --x)
2293                                 /* nothing */ ;
2294         }
2295         tmoveto(x, term.c.y);
2296 }
2297
2298 void
2299 techo(char *buf, int len) {
2300         for(; len > 0; buf++, len--) {
2301                 char c = *buf;
2302
2303                 if(BETWEEN(c, 0x00, 0x1f) || c == 0x7f) { /* control code */
2304                         if(c != '\n' && c != '\r' && c != '\t') {
2305                                 c ^= '\x40';
2306                                 tputc("^", 1);
2307                         }
2308                         tputc(&c, 1);
2309                 } else {
2310                         break;
2311                 }
2312         }
2313         if(len)
2314                 tputc(buf, len);
2315 }
2316
2317 void
2318 tdeftran(char ascii) {
2319         char c, (*bp)[2];
2320         static char tbl[][2] = {
2321                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2322                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2323                 {'5', CS_FIN},      {'C', CS_FIN},
2324                 {0, 0}
2325         };
2326
2327         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2328                 /* nothing */;
2329
2330         if (c == 0)
2331                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2332         else
2333                 term.trantbl[term.icharset] = (*bp)[1];
2334 }
2335
2336 void
2337 tselcs(void) {
2338         MODBIT(term.c.attr.mode,
2339                term.trantbl[term.charset] == CS_GRAPHIC0,
2340                ATTR_GFX);
2341 }
2342
2343 void
2344 tputc(char *c, int len) {
2345         uchar ascii = *c;
2346         bool control = ascii < '\x20' || ascii == 0177;
2347         long unicodep;
2348         int width;
2349
2350         if(len == 1) {
2351                 width = 1;
2352         } else {
2353                 utf8decode(c, &unicodep, UTF_SIZ);
2354                 width = wcwidth(unicodep);
2355         }
2356
2357         if(IS_SET(MODE_PRINT))
2358                 tprinter(c, len);
2359
2360         /*
2361          * STR sequences must be checked before anything else
2362          * because it can use some control codes as part of the sequence.
2363          */
2364         if(term.esc & ESC_STR) {
2365                 switch(ascii) {
2366                 case '\033':
2367                         term.esc = ESC_START | ESC_STR_END;
2368                         break;
2369                 case '\a': /* backwards compatibility to xterm */
2370                         term.esc = 0;
2371                         strhandle();
2372                         break;
2373                 default:
2374                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2375                                 memmove(&strescseq.buf[strescseq.len], c, len);
2376                                 strescseq.len += len;
2377                         } else {
2378                         /*
2379                          * Here is a bug in terminals. If the user never sends
2380                          * some code to stop the str or esc command, then st
2381                          * will stop responding. But this is better than
2382                          * silently failing with unknown characters. At least
2383                          * then users will report back.
2384                          *
2385                          * In the case users ever get fixed, here is the code:
2386                          */
2387                         /*
2388                          * term.esc = 0;
2389                          * strhandle();
2390                          */
2391                         }
2392                         break;
2393                 }
2394                 return;
2395         }
2396
2397         /*
2398          * Actions of control codes must be performed as soon they arrive
2399          * because they can be embedded inside a control sequence, and
2400          * they must not cause conflicts with sequences.
2401          */
2402         if(control) {
2403                 switch(ascii) {
2404                 case '\t':   /* HT */
2405                         tputtab(1);
2406                         return;
2407                 case '\b':   /* BS */
2408                         tmoveto(term.c.x-1, term.c.y);
2409                         return;
2410                 case '\r':   /* CR */
2411                         tmoveto(0, term.c.y);
2412                         return;
2413                 case '\f':   /* LF */
2414                 case '\v':   /* VT */
2415                 case '\n':   /* LF */
2416                         /* go to first col if the mode is set */
2417                         tnewline(IS_SET(MODE_CRLF));
2418                         return;
2419                 case '\a':   /* BEL */
2420                         if(!(xw.state & WIN_FOCUSED))
2421                                 xseturgency(1);
2422                         if (bellvolume)
2423                                 XBell(xw.dpy, bellvolume);
2424                         return;
2425                 case '\033': /* ESC */
2426                         csireset();
2427                         term.esc = ESC_START;
2428                         return;
2429                 case '\016': /* SO */
2430                         term.charset = 0;
2431                         tselcs();
2432                         return;
2433                 case '\017': /* SI */
2434                         term.charset = 1;
2435                         tselcs();
2436                         return;
2437                 case '\032': /* SUB */
2438                 case '\030': /* CAN */
2439                         csireset();
2440                         return;
2441                 case '\005': /* ENQ (IGNORED) */
2442                 case '\000': /* NUL (IGNORED) */
2443                 case '\021': /* XON (IGNORED) */
2444                 case '\023': /* XOFF (IGNORED) */
2445                 case 0177:   /* DEL (IGNORED) */
2446                         return;
2447                 }
2448         } else if(term.esc & ESC_START) {
2449                 if(term.esc & ESC_CSI) {
2450                         csiescseq.buf[csiescseq.len++] = ascii;
2451                         if(BETWEEN(ascii, 0x40, 0x7E)
2452                                         || csiescseq.len >= \
2453                                         sizeof(csiescseq.buf)-1) {
2454                                 term.esc = 0;
2455                                 csiparse();
2456                                 csihandle();
2457                         }
2458                 } else if(term.esc & ESC_ALTCHARSET) {
2459                         tdeftran(ascii);
2460                         tselcs();
2461                         term.esc = 0;
2462                 } else if(term.esc & ESC_TEST) {
2463                         if(ascii == '8') { /* DEC screen alignment test. */
2464                                 char E[UTF_SIZ] = "E";
2465                                 int x, y;
2466
2467                                 for(x = 0; x < term.col; ++x) {
2468                                         for(y = 0; y < term.row; ++y)
2469                                                 tsetchar(E, &term.c.attr, x, y);
2470                                 }
2471                         }
2472                         term.esc = 0;
2473                 } else {
2474                         switch(ascii) {
2475                         case '[':
2476                                 term.esc |= ESC_CSI;
2477                                 break;
2478                         case '#':
2479                                 term.esc |= ESC_TEST;
2480                                 break;
2481                         case 'P': /* DCS -- Device Control String */
2482                         case '_': /* APC -- Application Program Command */
2483                         case '^': /* PM -- Privacy Message */
2484                         case ']': /* OSC -- Operating System Command */
2485                         case 'k': /* old title set compatibility */
2486                                 strreset();
2487                                 strescseq.type = ascii;
2488                                 term.esc |= ESC_STR;
2489                                 break;
2490                         case '(': /* set primary charset G0 */
2491                         case ')': /* set secondary charset G1 */
2492                         case '*': /* set tertiary charset G2 */
2493                         case '+': /* set quaternary charset G3 */
2494                                 term.icharset = ascii - '(';
2495                                 term.esc |= ESC_ALTCHARSET;
2496                                 break;
2497                         case 'D': /* IND -- Linefeed */
2498                                 if(term.c.y == term.bot) {
2499                                         tscrollup(term.top, 1);
2500                                 } else {
2501                                         tmoveto(term.c.x, term.c.y+1);
2502                                 }
2503                                 term.esc = 0;
2504                                 break;
2505                         case 'E': /* NEL -- Next line */
2506                                 tnewline(1); /* always go to first col */
2507                                 term.esc = 0;
2508                                 break;
2509                         case 'H': /* HTS -- Horizontal tab stop */
2510                                 term.tabs[term.c.x] = 1;
2511                                 term.esc = 0;
2512                                 break;
2513                         case 'M': /* RI -- Reverse index */
2514                                 if(term.c.y == term.top) {
2515                                         tscrolldown(term.top, 1);
2516                                 } else {
2517                                         tmoveto(term.c.x, term.c.y-1);
2518                                 }
2519                                 term.esc = 0;
2520                                 break;
2521                         case 'Z': /* DECID -- Identify Terminal */
2522                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2523                                 term.esc = 0;
2524                                 break;
2525                         case 'c': /* RIS -- Reset to inital state */
2526                                 treset();
2527                                 term.esc = 0;
2528                                 xresettitle();
2529                                 xloadcols();
2530                                 break;
2531                         case '=': /* DECPAM -- Application keypad */
2532                                 term.mode |= MODE_APPKEYPAD;
2533                                 term.esc = 0;
2534                                 break;
2535                         case '>': /* DECPNM -- Normal keypad */
2536                                 term.mode &= ~MODE_APPKEYPAD;
2537                                 term.esc = 0;
2538                                 break;
2539                         case '7': /* DECSC -- Save Cursor */
2540                                 tcursor(CURSOR_SAVE);
2541                                 term.esc = 0;
2542                                 break;
2543                         case '8': /* DECRC -- Restore Cursor */
2544                                 tcursor(CURSOR_LOAD);
2545                                 term.esc = 0;
2546                                 break;
2547                         case '\\': /* ST -- String Terminator */
2548                                 if(term.esc & ESC_STR_END)
2549                                         strhandle();
2550                                 term.esc = 0;
2551                                 break;
2552                         default:
2553                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2554                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2555                                 term.esc = 0;
2556                                 break;
2557                         }
2558                 }
2559                 /*
2560                  * All characters which form part of a sequence are not
2561                  * printed
2562                  */
2563                 return;
2564         }
2565         /*
2566          * Display control codes only if we are in graphic mode
2567          */
2568         if(control && !(term.c.attr.mode & ATTR_GFX))
2569                 return;
2570         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2571                 selclear(NULL);
2572         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2573                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2574                 tnewline(1);
2575         }
2576
2577         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2578                 memmove(&term.line[term.c.y][term.c.x+1],
2579                         &term.line[term.c.y][term.c.x],
2580                         (term.col - term.c.x - 1) * sizeof(Glyph));
2581         }
2582
2583         if(term.c.x+width > term.col)
2584                 tnewline(1);
2585
2586         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2587
2588         if(width == 2) {
2589                 term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
2590                 if(term.c.x+1 < term.col) {
2591                         term.line[term.c.y][term.c.x+1].c[0] = '\0';
2592                         term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
2593                 }
2594         }
2595         if(term.c.x+width < term.col) {
2596                 tmoveto(term.c.x+width, term.c.y);
2597         } else {
2598                 term.c.state |= CURSOR_WRAPNEXT;
2599         }
2600 }
2601
2602 int
2603 tresize(int col, int row) {
2604         int i;
2605         int minrow = MIN(row, term.row);
2606         int mincol = MIN(col, term.col);
2607         int slide = term.c.y - row + 1;
2608         bool *bp;
2609         Line *orig;
2610
2611         if(col < 1 || row < 1)
2612                 return 0;
2613
2614         /* free unneeded rows */
2615         i = 0;
2616         if(slide > 0) {
2617                 /*
2618                  * slide screen to keep cursor where we expect it -
2619                  * tscrollup would work here, but we can optimize to
2620                  * memmove because we're freeing the earlier lines
2621                  */
2622                 for(/* i = 0 */; i < slide; i++) {
2623                         free(term.line[i]);
2624                         free(term.alt[i]);
2625                 }
2626                 memmove(term.line, term.line + slide, row * sizeof(Line));
2627                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2628         }
2629         for(i += row; i < term.row; i++) {
2630                 free(term.line[i]);
2631                 free(term.alt[i]);
2632         }
2633
2634         /* resize to new height */
2635         term.line = xrealloc(term.line, row * sizeof(Line));
2636         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2637         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2638         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2639
2640         /* resize each row to new width, zero-pad if needed */
2641         for(i = 0; i < minrow; i++) {
2642                 term.dirty[i] = 1;
2643                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2644                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2645         }
2646
2647         /* allocate any new rows */
2648         for(/* i == minrow */; i < row; i++) {
2649                 term.dirty[i] = 1;
2650                 term.line[i] = xmalloc(col * sizeof(Glyph));
2651                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2652         }
2653         if(col > term.col) {
2654                 bp = term.tabs + term.col;
2655
2656                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2657                 while(--bp > term.tabs && !*bp)
2658                         /* nothing */ ;
2659                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2660                         *bp = 1;
2661         }
2662         /* update terminal size */
2663         term.col = col;
2664         term.row = row;
2665         /* reset scrolling region */
2666         tsetscroll(0, row-1);
2667         /* make use of the LIMIT in tmoveto */
2668         tmoveto(term.c.x, term.c.y);
2669         /* Clearing both screens */
2670         orig = term.line;
2671         do {
2672                 if(mincol < col && 0 < minrow) {
2673                         tclearregion(mincol, 0, col - 1, minrow - 1);
2674                 }
2675                 if(0 < col && minrow < row) {
2676                         tclearregion(0, minrow, col - 1, row - 1);
2677                 }
2678                 tcursor(CURSOR_SAVE);
2679                 tswapscreen();
2680                 tcursor(CURSOR_LOAD);
2681         } while(orig != term.line);
2682
2683         return (slide > 0);
2684 }
2685
2686 void
2687 xresize(int col, int row) {
2688         xw.tw = MAX(1, col * xw.cw);
2689         xw.th = MAX(1, row * xw.ch);
2690
2691         XFreePixmap(xw.dpy, xw.buf);
2692         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2693                         DefaultDepth(xw.dpy, xw.scr));
2694         XftDrawChange(xw.draw, xw.buf);
2695         xclear(0, 0, xw.w, xw.h);
2696 }
2697
2698 static inline ushort
2699 sixd_to_16bit(int x) {
2700         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2701 }
2702
2703 void
2704 xloadcols(void) {
2705         int i, r, g, b;
2706         XRenderColor color = { .alpha = 0xffff };
2707         static bool loaded;
2708         Colour *cp;
2709
2710         if(loaded) {
2711                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2712                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2713         }
2714
2715         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2716         for(i = 0; i < LEN(colorname); i++) {
2717                 if(!colorname[i])
2718                         continue;
2719                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2720                         die("Could not allocate color '%s'\n", colorname[i]);
2721                 }
2722         }
2723
2724         /* load colors [16-255] ; same colors as xterm */
2725         for(i = 16, r = 0; r < 6; r++) {
2726                 for(g = 0; g < 6; g++) {
2727                         for(b = 0; b < 6; b++) {
2728                                 color.red = sixd_to_16bit(r);
2729                                 color.green = sixd_to_16bit(g);
2730                                 color.blue = sixd_to_16bit(b);
2731                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2732                                         die("Could not allocate color %d\n", i);
2733                                 }
2734                                 i++;
2735                         }
2736                 }
2737         }
2738
2739         for(r = 0; r < 24; r++, i++) {
2740                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2741                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2742                                         &dc.col[i])) {
2743                         die("Could not allocate color %d\n", i);
2744                 }
2745         }
2746         loaded = true;
2747 }
2748
2749 int
2750 xsetcolorname(int x, const char *name) {
2751         XRenderColor color = { .alpha = 0xffff };
2752         Colour colour;
2753         if(!BETWEEN(x, 0, LEN(colorname)))
2754                 return -1;
2755         if(!name) {
2756                 if(BETWEEN(x, 16, 16 + 215)) {
2757                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2758                         color.red = sixd_to_16bit(r);
2759                         color.green = sixd_to_16bit(g);
2760                         color.blue = sixd_to_16bit(b);
2761                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2762                                 return 0; /* something went wrong */
2763                         dc.col[x] = colour;
2764                         return 1;
2765                 } else if(BETWEEN(x, 16 + 216, 255)) {
2766                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2767                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2768                                 return 0; /* something went wrong */
2769                         dc.col[x] = colour;
2770                         return 1;
2771                 } else {
2772                         name = colorname[x];
2773                 }
2774         }
2775         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2776                 return 0;
2777         dc.col[x] = colour;
2778         return 1;
2779 }
2780
2781 void
2782 xtermclear(int col1, int row1, int col2, int row2) {
2783         XftDrawRect(xw.draw,
2784                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2785                         borderpx + col1 * xw.cw,
2786                         borderpx + row1 * xw.ch,
2787                         (col2-col1+1) * xw.cw,
2788                         (row2-row1+1) * xw.ch);
2789 }
2790
2791 /*
2792  * Absolute coordinates.
2793  */
2794 void
2795 xclear(int x1, int y1, int x2, int y2) {
2796         XftDrawRect(xw.draw,
2797                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2798                         x1, y1, x2-x1, y2-y1);
2799 }
2800
2801 void
2802 xhints(void) {
2803         XClassHint class = {opt_class ? opt_class : termname, termname};
2804         XWMHints wm = {.flags = InputHint, .input = 1};
2805         XSizeHints *sizeh = NULL;
2806
2807         sizeh = XAllocSizeHints();
2808
2809         sizeh->flags = PSize | PResizeInc | PBaseSize;
2810         sizeh->height = xw.h;
2811         sizeh->width = xw.w;
2812         sizeh->height_inc = xw.ch;
2813         sizeh->width_inc = xw.cw;
2814         sizeh->base_height = 2 * borderpx;
2815         sizeh->base_width = 2 * borderpx;
2816         if(xw.isfixed == True) {
2817                 sizeh->flags |= PMaxSize | PMinSize;
2818                 sizeh->min_width = sizeh->max_width = xw.w;
2819                 sizeh->min_height = sizeh->max_height = xw.h;
2820         }
2821         if(xw.gm & (XValue|YValue)) {
2822                 sizeh->flags |= USPosition | PWinGravity;
2823                 sizeh->x = xw.l;
2824                 sizeh->y = xw.t;
2825                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2826         }
2827
2828         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2829                         &class);
2830         XFree(sizeh);
2831 }
2832
2833 int
2834 xgeommasktogravity(int mask) {
2835         switch(mask & (XNegative|YNegative)) {
2836         case 0:
2837                 return NorthWestGravity;
2838         case XNegative:
2839                 return NorthEastGravity;
2840         case YNegative:
2841                 return SouthWestGravity;
2842         }
2843         return SouthEastGravity;
2844 }
2845
2846 int
2847 xloadfont(Font *f, FcPattern *pattern) {
2848         FcPattern *match;
2849         FcResult result;
2850
2851         match = FcFontMatch(NULL, pattern, &result);
2852         if(!match)
2853                 return 1;
2854
2855         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2856                 FcPatternDestroy(match);
2857                 return 1;
2858         }
2859
2860         f->set = NULL;
2861         f->pattern = FcPatternDuplicate(pattern);
2862
2863         f->ascent = f->match->ascent;
2864         f->descent = f->match->descent;
2865         f->lbearing = 0;
2866         f->rbearing = f->match->max_advance_width;
2867
2868         f->height = f->ascent + f->descent;
2869         f->width = f->lbearing + f->rbearing;
2870
2871         return 0;
2872 }
2873
2874 void
2875 xloadfonts(char *fontstr, double fontsize) {
2876         FcPattern *pattern;
2877         FcResult r_sz, r_psz;
2878         double fontval;
2879
2880         if(fontstr[0] == '-') {
2881                 pattern = XftXlfdParse(fontstr, False, False);
2882         } else {
2883                 pattern = FcNameParse((FcChar8 *)fontstr);
2884         }
2885
2886         if(!pattern)
2887                 die("st: can't open font %s\n", fontstr);
2888
2889         if(fontsize > 0) {
2890                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2891                 FcPatternDel(pattern, FC_SIZE);
2892                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2893                 usedfontsize = fontsize;
2894         } else {
2895                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2896                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2897                 if(r_psz == FcResultMatch) {
2898                         usedfontsize = fontval;
2899                 } else if(r_sz == FcResultMatch) {
2900                         usedfontsize = -1;
2901                 } else {
2902                         /*
2903                          * Default font size is 12, if none given. This is to
2904                          * have a known usedfontsize value.
2905                          */
2906                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2907                         usedfontsize = 12;
2908                 }
2909         }
2910
2911         FcConfigSubstitute(0, pattern, FcMatchPattern);
2912         FcDefaultSubstitute(pattern);
2913
2914         if(xloadfont(&dc.font, pattern))
2915                 die("st: can't open font %s\n", fontstr);
2916
2917         if(usedfontsize < 0) {
2918                 FcPatternGetDouble(dc.font.match->pattern,
2919                                    FC_PIXEL_SIZE, 0, &fontval);
2920                 usedfontsize = fontval;
2921         }
2922
2923         /* Setting character width and height. */
2924         xw.cw = CEIL(dc.font.width * cwscale);
2925         xw.ch = CEIL(dc.font.height * chscale);
2926
2927         FcPatternDel(pattern, FC_SLANT);
2928         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2929         if(xloadfont(&dc.ifont, pattern))
2930                 die("st: can't open font %s\n", fontstr);
2931
2932         FcPatternDel(pattern, FC_WEIGHT);
2933         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2934         if(xloadfont(&dc.ibfont, pattern))
2935                 die("st: can't open font %s\n", fontstr);
2936
2937         FcPatternDel(pattern, FC_SLANT);
2938         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2939         if(xloadfont(&dc.bfont, pattern))
2940                 die("st: can't open font %s\n", fontstr);
2941
2942         FcPatternDestroy(pattern);
2943 }
2944
2945 int
2946 xloadfontset(Font *f) {
2947         FcResult result;
2948
2949         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2950                 return 1;
2951         return 0;
2952 }
2953
2954 void
2955 xunloadfont(Font *f) {
2956         XftFontClose(xw.dpy, f->match);
2957         FcPatternDestroy(f->pattern);
2958         if(f->set)
2959                 FcFontSetDestroy(f->set);
2960 }
2961
2962 void
2963 xunloadfonts(void) {
2964         int i;
2965
2966         /* Free the loaded fonts in the font cache.  */
2967         for(i = 0; i < frclen; i++) {
2968                 XftFontClose(xw.dpy, frc[i].font);
2969         }
2970         frclen = 0;
2971
2972         xunloadfont(&dc.font);
2973         xunloadfont(&dc.bfont);
2974         xunloadfont(&dc.ifont);
2975         xunloadfont(&dc.ibfont);
2976 }
2977
2978 void
2979 xzoom(const Arg *arg) {
2980         xunloadfonts();
2981         xloadfonts(usedfont, usedfontsize + arg->i);
2982         cresize(0, 0);
2983         redraw(0);
2984 }
2985
2986 void
2987 xinit(void) {
2988         XGCValues gcvalues;
2989         Cursor cursor;
2990         Window parent;
2991         pid_t thispid = getpid();
2992
2993         if(!(xw.dpy = XOpenDisplay(NULL)))
2994                 die("Can't open display\n");
2995         xw.scr = XDefaultScreen(xw.dpy);
2996         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2997
2998         /* font */
2999         if(!FcInit())
3000                 die("Could not init fontconfig.\n");
3001
3002         usedfont = (opt_font == NULL)? font : opt_font;
3003         xloadfonts(usedfont, 0);
3004
3005         /* colors */
3006         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3007         xloadcols();
3008
3009         /* adjust fixed window geometry */
3010         xw.w = 2 * borderpx + term.col * xw.cw;
3011         xw.h = 2 * borderpx + term.row * xw.ch;
3012         if(xw.gm & XNegative)
3013                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3014         if(xw.gm & YNegative)
3015                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3016
3017         /* Events */
3018         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3019         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3020         xw.attrs.bit_gravity = NorthWestGravity;
3021         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3022                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3023                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3024         xw.attrs.colormap = xw.cmap;
3025
3026         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3027                         XRootWindow(xw.dpy, xw.scr);
3028         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3029                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3030                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3031                         | CWEventMask | CWColormap, &xw.attrs);
3032
3033         memset(&gcvalues, 0, sizeof(gcvalues));
3034         gcvalues.graphics_exposures = False;
3035         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3036                         &gcvalues);
3037         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3038                         DefaultDepth(xw.dpy, xw.scr));
3039         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3040         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3041
3042         /* Xft rendering context */
3043         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3044
3045         /* input methods */
3046         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3047                 XSetLocaleModifiers("@im=local");
3048                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3049                         XSetLocaleModifiers("@im=");
3050                         if((xw.xim = XOpenIM(xw.dpy,
3051                                         NULL, NULL, NULL)) == NULL) {
3052                                 die("XOpenIM failed. Could not open input"
3053                                         " device.\n");
3054                         }
3055                 }
3056         }
3057         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3058                                            | XIMStatusNothing, XNClientWindow, xw.win,
3059                                            XNFocusWindow, xw.win, NULL);
3060         if(xw.xic == NULL)
3061                 die("XCreateIC failed. Could not obtain input method.\n");
3062
3063         /* white cursor, black outline */
3064         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3065         XDefineCursor(xw.dpy, xw.win, cursor);
3066         XRecolorCursor(xw.dpy, cursor,
3067                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3068                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3069
3070         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3071         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3072         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3073         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3074
3075         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3076         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3077                         PropModeReplace, (uchar *)&thispid, 1);
3078
3079         xresettitle();
3080         XMapWindow(xw.dpy, xw.win);
3081         xhints();
3082         XSync(xw.dpy, False);
3083 }
3084
3085 void
3086 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3087         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3088             width = charlen * xw.cw, xp, i;
3089         int frcflags;
3090         int u8fl, u8fblen, u8cblen, doesexist;
3091         char *u8c, *u8fs;
3092         long unicodep;
3093         Font *font = &dc.font;
3094         FcResult fcres;
3095         FcPattern *fcpattern, *fontpattern;
3096         FcFontSet *fcsets[] = { NULL };
3097         FcCharSet *fccharset;
3098         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3099         XRenderColor colfg, colbg;
3100         XRectangle r;
3101         int oneatatime;
3102
3103         frcflags = FRC_NORMAL;
3104
3105         if(base.mode & ATTR_ITALIC) {
3106                 if(base.fg == defaultfg)
3107                         base.fg = defaultitalic;
3108                 font = &dc.ifont;
3109                 frcflags = FRC_ITALIC;
3110         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3111                 if(base.fg == defaultfg)
3112                         base.fg = defaultitalic;
3113                 font = &dc.ibfont;
3114                 frcflags = FRC_ITALICBOLD;
3115         } else if(base.mode & ATTR_UNDERLINE) {
3116                 if(base.fg == defaultfg)
3117                         base.fg = defaultunderline;
3118         }
3119
3120         if(IS_TRUECOL(base.fg)) {
3121                 colfg.alpha = 0xffff;
3122                 colfg.red = TRUERED(base.fg);
3123                 colfg.green = TRUEGREEN(base.fg);
3124                 colfg.blue = TRUEBLUE(base.fg);
3125                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3126                 fg = &truefg;
3127         } else {
3128                 fg = &dc.col[base.fg];
3129         }
3130
3131         if(IS_TRUECOL(base.bg)) {
3132                 colbg.alpha = 0xffff;
3133                 colbg.green = TRUEGREEN(base.bg);
3134                 colbg.red = TRUERED(base.bg);
3135                 colbg.blue = TRUEBLUE(base.bg);
3136                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3137                 bg = &truebg;
3138         } else {
3139                 bg = &dc.col[base.bg];
3140         }
3141
3142         if(base.mode & ATTR_BOLD) {
3143                 if(BETWEEN(base.fg, 0, 7)) {
3144                         /* basic system colors */
3145                         fg = &dc.col[base.fg + 8];
3146                 } else if(BETWEEN(base.fg, 16, 195)) {
3147                         /* 256 colors */
3148                         fg = &dc.col[base.fg + 36];
3149                 } else if(BETWEEN(base.fg, 232, 251)) {
3150                         /* greyscale */
3151                         fg = &dc.col[base.fg + 4];
3152                 }
3153                 /*
3154                  * Those ranges will not be brightened:
3155                  *    8 - 15 – bright system colors
3156                  *    196 - 231 – highest 256 color cube
3157                  *    252 - 255 – brightest colors in greyscale
3158                  */
3159                 font = &dc.bfont;
3160                 frcflags = FRC_BOLD;
3161         }
3162
3163         if(IS_SET(MODE_REVERSE)) {
3164                 if(fg == &dc.col[defaultfg]) {
3165                         fg = &dc.col[defaultbg];
3166                 } else {
3167                         colfg.red = ~fg->color.red;
3168                         colfg.green = ~fg->color.green;
3169                         colfg.blue = ~fg->color.blue;
3170                         colfg.alpha = fg->color.alpha;
3171                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3172                                         &revfg);
3173                         fg = &revfg;
3174                 }
3175
3176                 if(bg == &dc.col[defaultbg]) {
3177                         bg = &dc.col[defaultfg];
3178                 } else {
3179                         colbg.red = ~bg->color.red;
3180                         colbg.green = ~bg->color.green;
3181                         colbg.blue = ~bg->color.blue;
3182                         colbg.alpha = bg->color.alpha;
3183                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3184                                         &revbg);
3185                         bg = &revbg;
3186                 }
3187         }
3188
3189         if(base.mode & ATTR_REVERSE) {
3190                 temp = fg;
3191                 fg = bg;
3192                 bg = temp;
3193         }
3194
3195         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3196                 fg = bg;
3197
3198         /* Intelligent cleaning up of the borders. */
3199         if(x == 0) {
3200                 xclear(0, (y == 0)? 0 : winy, borderpx,
3201                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3202         }
3203         if(x + charlen >= term.col) {
3204                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3205                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3206         }
3207         if(y == 0)
3208                 xclear(winx, 0, winx + width, borderpx);
3209         if(y == term.row-1)
3210                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3211
3212         /* Clean up the region we want to draw to. */
3213         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3214
3215         /* Set the clip region because Xft is sometimes dirty. */
3216         r.x = 0;
3217         r.y = 0;
3218         r.height = xw.ch;
3219         r.width = width;
3220         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3221
3222         for(xp = winx; bytelen > 0;) {
3223                 /*
3224                  * Search for the range in the to be printed string of glyphs
3225                  * that are in the main font. Then print that range. If
3226                  * some glyph is found that is not in the font, do the
3227                  * fallback dance.
3228                  */
3229                 u8fs = s;
3230                 u8fblen = 0;
3231                 u8fl = 0;
3232                 oneatatime = font->width != xw.cw;
3233                 for(;;) {
3234                         u8c = s;
3235                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3236                         s += u8cblen;
3237                         bytelen -= u8cblen;
3238
3239                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3240                         if(oneatatime || !doesexist || bytelen <= 0) {
3241                                 if(oneatatime || bytelen <= 0) {
3242                                         if(doesexist) {
3243                                                 u8fl++;
3244                                                 u8fblen += u8cblen;
3245                                         }
3246                                 }
3247
3248                                 if(u8fl > 0) {
3249                                         XftDrawStringUtf8(xw.draw, fg,
3250                                                         font->match, xp,
3251                                                         winy + font->ascent,
3252                                                         (FcChar8 *)u8fs,
3253                                                         u8fblen);
3254                                         xp += xw.cw * u8fl;
3255
3256                                 }
3257                                 break;
3258                         }
3259
3260                         u8fl++;
3261                         u8fblen += u8cblen;
3262                 }
3263                 if(doesexist) {
3264                         if(oneatatime)
3265                                 continue;
3266                         break;
3267                 }
3268
3269                 /* Search the font cache. */
3270                 for(i = 0; i < frclen; i++) {
3271                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3272                                         && frc[i].flags == frcflags) {
3273                                 break;
3274                         }
3275                 }
3276
3277                 /* Nothing was found. */
3278                 if(i >= frclen) {
3279                         if(!font->set)
3280                                 xloadfontset(font);
3281                         fcsets[0] = font->set;
3282
3283                         /*
3284                          * Nothing was found in the cache. Now use
3285                          * some dozen of Fontconfig calls to get the
3286                          * font for one single character.
3287                          *
3288                          * Xft and fontconfig are design failures.
3289                          */
3290                         fcpattern = FcPatternDuplicate(font->pattern);
3291                         fccharset = FcCharSetCreate();
3292
3293                         FcCharSetAddChar(fccharset, unicodep);
3294                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3295                                         fccharset);
3296                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3297                                         FcTrue);
3298
3299                         FcConfigSubstitute(0, fcpattern,
3300                                         FcMatchPattern);
3301                         FcDefaultSubstitute(fcpattern);
3302
3303                         fontpattern = FcFontSetMatch(0, fcsets,
3304                                         FcTrue, fcpattern, &fcres);
3305
3306                         /*
3307                          * Overwrite or create the new cache entry.
3308                          */
3309                         if(frclen >= LEN(frc)) {
3310                                 frclen = LEN(frc) - 1;
3311                                 XftFontClose(xw.dpy, frc[frclen].font);
3312                         }
3313
3314                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3315                                         fontpattern);
3316                         frc[frclen].flags = frcflags;
3317
3318                         i = frclen;
3319                         frclen++;
3320
3321                         FcPatternDestroy(fcpattern);
3322                         FcCharSetDestroy(fccharset);
3323                 }
3324
3325                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3326                                 xp, winy + frc[i].font->ascent,
3327                                 (FcChar8 *)u8c, u8cblen);
3328
3329                 xp += xw.cw * wcwidth(unicodep);
3330         }
3331
3332         /*
3333          * This is how the loop above actually should be. Why does the
3334          * application have to care about font details?
3335          *
3336          * I have to repeat: Xft and Fontconfig are design failures.
3337          */
3338         /*
3339         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3340                         winy + font->ascent, (FcChar8 *)s, bytelen);
3341         */
3342
3343         if(base.mode & ATTR_UNDERLINE) {
3344                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3345                                 width, 1);
3346         }
3347
3348         /* Reset clip to none. */
3349         XftDrawSetClip(xw.draw, 0);
3350 }
3351
3352 void
3353 xdrawcursor(void) {
3354         static int oldx = 0, oldy = 0;
3355         int sl, width, curx;
3356         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3357
3358         LIMIT(oldx, 0, term.col-1);
3359         LIMIT(oldy, 0, term.row-1);
3360
3361         curx = term.c.x;
3362
3363         /* adjust position if in dummy */
3364         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3365                 oldx--;
3366         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3367                 curx--;
3368
3369         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3370
3371         /* remove the old cursor */
3372         sl = utf8len(term.line[oldy][oldx].c);
3373         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3374         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3375                         oldy, width, sl);
3376
3377         /* draw the new one */
3378         if(!(IS_SET(MODE_HIDE))) {
3379                 if(xw.state & WIN_FOCUSED) {
3380                         if(IS_SET(MODE_REVERSE)) {
3381                                 g.mode |= ATTR_REVERSE;
3382                                 g.fg = defaultcs;
3383                                 g.bg = defaultfg;
3384                         }
3385
3386                         sl = utf8len(g.c);
3387                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3388                                 ? 2 : 1;
3389                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3390                 } else {
3391                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3392                                         borderpx + curx * xw.cw,
3393                                         borderpx + term.c.y * xw.ch,
3394                                         xw.cw - 1, 1);
3395                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3396                                         borderpx + curx * xw.cw,
3397                                         borderpx + term.c.y * xw.ch,
3398                                         1, xw.ch - 1);
3399                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3400                                         borderpx + (curx + 1) * xw.cw - 1,
3401                                         borderpx + term.c.y * xw.ch,
3402                                         1, xw.ch - 1);
3403                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3404                                         borderpx + curx * xw.cw,
3405                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3406                                         xw.cw, 1);
3407                 }
3408                 oldx = curx, oldy = term.c.y;
3409         }
3410 }
3411
3412
3413 void
3414 xsettitle(char *p) {
3415         XTextProperty prop;
3416
3417         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3418                         &prop);
3419         XSetWMName(xw.dpy, xw.win, &prop);
3420         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3421         XFree(prop.value);
3422 }
3423
3424 void
3425 xresettitle(void) {
3426         xsettitle(opt_title ? opt_title : "st");
3427 }
3428
3429 void
3430 redraw(int timeout) {
3431         struct timespec tv = {0, timeout * 1000};
3432
3433         draw();
3434
3435         if(timeout > 0) {
3436                 nanosleep(&tv, NULL);
3437                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3438         }
3439 }
3440
3441 void
3442 draw(void) {
3443         drawregion(0, 0, term.col, term.row);
3444         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3445                         xw.h, 0, 0);
3446         XSetForeground(xw.dpy, dc.gc,
3447                         dc.col[IS_SET(MODE_REVERSE)?
3448                                 defaultfg : defaultbg].pixel);
3449 }
3450
3451 void
3452 drawregion(int x1, int y1, int x2, int y2) {
3453         int ic, ib, x, y, ox, sl;
3454         Glyph base, new;
3455         char buf[DRAW_BUF_SIZ];
3456         bool ena_sel = sel.ob.x != -1;
3457         long unicodep;
3458
3459         if(sel.alt != IS_SET(MODE_ALTSCREEN))
3460                 ena_sel = 0;
3461
3462         if(!(xw.state & WIN_VISIBLE))
3463                 return;
3464
3465         for(y = y1; y < y2; y++) {
3466                 if(!term.dirty[y])
3467                         continue;
3468
3469                 xtermclear(0, y, term.col, y);
3470                 term.dirty[y] = 0;
3471                 base = term.line[y][0];
3472                 ic = ib = ox = 0;
3473                 for(x = x1; x < x2; x++) {
3474                         new = term.line[y][x];
3475                         if(new.mode == ATTR_WDUMMY)
3476                                 continue;
3477                         if(ena_sel && selected(x, y))
3478                                 new.mode ^= ATTR_REVERSE;
3479                         if(ib > 0 && (ATTRCMP(base, new)
3480                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3481                                 xdraws(buf, base, ox, y, ic, ib);
3482                                 ic = ib = 0;
3483                         }
3484                         if(ib == 0) {
3485                                 ox = x;
3486                                 base = new;
3487                         }
3488
3489                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3490                         memcpy(buf+ib, new.c, sl);
3491                         ib += sl;
3492                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3493                 }
3494                 if(ib > 0)
3495                         xdraws(buf, base, ox, y, ic, ib);
3496         }
3497         xdrawcursor();
3498 }
3499
3500 void
3501 expose(XEvent *ev) {
3502         XExposeEvent *e = &ev->xexpose;
3503
3504         if(xw.state & WIN_REDRAW) {
3505                 if(!e->count)
3506                         xw.state &= ~WIN_REDRAW;
3507         }
3508         redraw(0);
3509 }
3510
3511 void
3512 visibility(XEvent *ev) {
3513         XVisibilityEvent *e = &ev->xvisibility;
3514
3515         if(e->state == VisibilityFullyObscured) {
3516                 xw.state &= ~WIN_VISIBLE;
3517         } else if(!(xw.state & WIN_VISIBLE)) {
3518                 /* need a full redraw for next Expose, not just a buf copy */
3519                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3520         }
3521 }
3522
3523 void
3524 unmap(XEvent *ev) {
3525         xw.state &= ~WIN_VISIBLE;
3526 }
3527
3528 void
3529 xsetpointermotion(int set) {
3530         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3531         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3532 }
3533
3534 void
3535 xseturgency(int add) {
3536         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3537
3538         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3539         XSetWMHints(xw.dpy, xw.win, h);
3540         XFree(h);
3541 }
3542
3543 void
3544 focus(XEvent *ev) {
3545         XFocusChangeEvent *e = &ev->xfocus;
3546
3547         if(e->mode == NotifyGrab)
3548                 return;
3549
3550         if(ev->type == FocusIn) {
3551                 XSetICFocus(xw.xic);
3552                 xw.state |= WIN_FOCUSED;
3553                 xseturgency(0);
3554                 if(IS_SET(MODE_FOCUS))
3555                         ttywrite("\033[I", 3);
3556         } else {
3557                 XUnsetICFocus(xw.xic);
3558                 xw.state &= ~WIN_FOCUSED;
3559                 if(IS_SET(MODE_FOCUS))
3560                         ttywrite("\033[O", 3);
3561         }
3562 }
3563
3564 static inline bool
3565 match(uint mask, uint state) {
3566         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3567 }
3568
3569 void
3570 numlock(const Arg *dummy) {
3571         term.numlock ^= 1;
3572 }
3573
3574 char*
3575 kmap(KeySym k, uint state) {
3576         Key *kp;
3577         int i;
3578
3579         /* Check for mapped keys out of X11 function keys. */
3580         for(i = 0; i < LEN(mappedkeys); i++) {
3581                 if(mappedkeys[i] == k)
3582                         break;
3583         }
3584         if(i == LEN(mappedkeys)) {
3585                 if((k & 0xFFFF) < 0xFD00)
3586                         return NULL;
3587         }
3588
3589         for(kp = key; kp < key + LEN(key); kp++) {
3590                 if(kp->k != k)
3591                         continue;
3592
3593                 if(!match(kp->mask, state))
3594                         continue;
3595
3596                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3597                         continue;
3598                 if(term.numlock && kp->appkey == 2)
3599                         continue;
3600
3601                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3602                         continue;
3603
3604                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3605                         continue;
3606
3607                 return kp->s;
3608         }
3609
3610         return NULL;
3611 }
3612
3613 void
3614 kpress(XEvent *ev) {
3615         XKeyEvent *e = &ev->xkey;
3616         KeySym ksym;
3617         char buf[32], *customkey;
3618         int len;
3619         long c;
3620         Status status;
3621         Shortcut *bp;
3622
3623         if(IS_SET(MODE_KBDLOCK))
3624                 return;
3625
3626         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3627         /* 1. shortcuts */
3628         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3629                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3630                         bp->func(&(bp->arg));
3631                         return;
3632                 }
3633         }
3634
3635         /* 2. custom keys from config.h */
3636         if((customkey = kmap(ksym, e->state))) {
3637                 ttysend(customkey, strlen(customkey));
3638                 return;
3639         }
3640
3641         /* 3. composed string from input method */
3642         if(len == 0)
3643                 return;
3644         if(len == 1 && e->state & Mod1Mask) {
3645                 if(IS_SET(MODE_8BIT)) {
3646                         if(*buf < 0177) {
3647                                 c = *buf | 0x80;
3648                                 len = utf8encode(c, buf, UTF_SIZ);
3649                         }
3650                 } else {
3651                         buf[1] = buf[0];
3652                         buf[0] = '\033';
3653                         len = 2;
3654                 }
3655         }
3656         ttysend(buf, len);
3657 }
3658
3659
3660 void
3661 cmessage(XEvent *e) {
3662         /*
3663          * See xembed specs
3664          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3665          */
3666         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3667                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3668                         xw.state |= WIN_FOCUSED;
3669                         xseturgency(0);
3670                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3671                         xw.state &= ~WIN_FOCUSED;
3672                 }
3673         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3674                 /* Send SIGHUP to shell */
3675                 kill(pid, SIGHUP);
3676                 exit(EXIT_SUCCESS);
3677         }
3678 }
3679
3680 void
3681 cresize(int width, int height) {
3682         int col, row;
3683
3684         if(width != 0)
3685                 xw.w = width;
3686         if(height != 0)
3687                 xw.h = height;
3688
3689         col = (xw.w - 2 * borderpx) / xw.cw;
3690         row = (xw.h - 2 * borderpx) / xw.ch;
3691
3692         tresize(col, row);
3693         xresize(col, row);
3694         ttyresize();
3695 }
3696
3697 void
3698 resize(XEvent *e) {
3699         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3700                 return;
3701
3702         cresize(e->xconfigure.width, e->xconfigure.height);
3703 }
3704
3705 void
3706 run(void) {
3707         XEvent ev;
3708         int w = xw.w, h = xw.h;
3709         fd_set rfd;
3710         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3711         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3712
3713         /* Waiting for window mapping */
3714         while(1) {
3715                 XNextEvent(xw.dpy, &ev);
3716                 if(ev.type == ConfigureNotify) {
3717                         w = ev.xconfigure.width;
3718                         h = ev.xconfigure.height;
3719                 } else if(ev.type == MapNotify) {
3720                         break;
3721                 }
3722         }
3723
3724         ttynew();
3725         cresize(w, h);
3726
3727         gettimeofday(&last, NULL);
3728         lastblink = last;
3729
3730         for(xev = actionfps;;) {
3731                 long deltatime;
3732
3733                 FD_ZERO(&rfd);
3734                 FD_SET(cmdfd, &rfd);
3735                 FD_SET(xfd, &rfd);
3736
3737                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3738                         if(errno == EINTR)
3739                                 continue;
3740                         die("select failed: %s\n", strerror(errno));
3741                 }
3742                 if(FD_ISSET(cmdfd, &rfd)) {
3743                         ttyread();
3744                         if(blinktimeout) {
3745                                 blinkset = tattrset(ATTR_BLINK);
3746                                 if(!blinkset)
3747                                         MODBIT(term.mode, 0, MODE_BLINK);
3748                         }
3749                 }
3750
3751                 if(FD_ISSET(xfd, &rfd))
3752                         xev = actionfps;
3753
3754                 gettimeofday(&now, NULL);
3755                 drawtimeout.tv_sec = 0;
3756                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3757                 tv = &drawtimeout;
3758
3759                 dodraw = 0;
3760                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3761                         tsetdirtattr(ATTR_BLINK);
3762                         term.mode ^= MODE_BLINK;
3763                         lastblink = now;
3764                         dodraw = 1;
3765                 }
3766                 deltatime = TIMEDIFF(now, last);
3767                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3768                                 || deltatime < 0) {
3769                         dodraw = 1;
3770                         last = now;
3771                 }
3772
3773                 if(dodraw) {
3774                         while(XPending(xw.dpy)) {
3775                                 XNextEvent(xw.dpy, &ev);
3776                                 if(XFilterEvent(&ev, None))
3777                                         continue;
3778                                 if(handler[ev.type])
3779                                         (handler[ev.type])(&ev);
3780                         }
3781
3782                         draw();
3783                         XFlush(xw.dpy);
3784
3785                         if(xev && !FD_ISSET(xfd, &rfd))
3786                                 xev--;
3787                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3788                                 if(blinkset) {
3789                                         if(TIMEDIFF(now, lastblink) \
3790                                                         > blinktimeout) {
3791                                                 drawtimeout.tv_usec = 1;
3792                                         } else {
3793                                                 drawtimeout.tv_usec = (1000 * \
3794                                                         (blinktimeout - \
3795                                                         TIMEDIFF(now,
3796                                                                 lastblink)));
3797                                         }
3798                                 } else {
3799                                         tv = NULL;
3800                                 }
3801                         }
3802                 }
3803         }
3804 }
3805
3806 void
3807 usage(void) {
3808         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3809         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3810         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3811 }
3812
3813 int
3814 main(int argc, char *argv[]) {
3815         char *titles;
3816         uint cols = 80, rows = 24;
3817
3818         xw.l = xw.t = 0;
3819         xw.isfixed = False;
3820
3821         ARGBEGIN {
3822         case 'a':
3823                 allowaltscreen = false;
3824                 break;
3825         case 'c':
3826                 opt_class = EARGF(usage());
3827                 break;
3828         case 'e':
3829                 /* eat all remaining arguments */
3830                 if(argc > 1) {
3831                         opt_cmd = &argv[1];
3832                         if(argv[1] != NULL && opt_title == NULL) {
3833                                 titles = xstrdup(argv[1]);
3834                                 opt_title = basename(titles);
3835                         }
3836                 }
3837                 goto run;
3838         case 'f':
3839                 opt_font = EARGF(usage());
3840                 break;
3841         case 'g':
3842                 xw.gm = XParseGeometry(EARGF(usage()),
3843                                 &xw.l, &xw.t, &cols, &rows);
3844                 break;
3845         case 'i':
3846                 xw.isfixed = True;
3847                 break;
3848         case 'o':
3849                 opt_io = EARGF(usage());
3850                 break;
3851         case 't':
3852                 opt_title = EARGF(usage());
3853                 break;
3854         case 'w':
3855                 opt_embed = EARGF(usage());
3856                 break;
3857         case 'v':
3858         default:
3859                 usage();
3860         } ARGEND;
3861
3862 run:
3863         setlocale(LC_CTYPE, "");
3864         XSetLocaleModifiers("");
3865         tnew(cols? cols : 1, rows? rows : 1);
3866         xinit();
3867         selinit();
3868         run();
3869
3870         return 0;
3871 }
3872