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,  /* DSC, 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 fx, fy, fw, fh; /* fixed geometry */
 254         int tw, th; /* tty width and height */
 255         int w, h; /* window width and height */
 256         int ch; /* char height */
 257         int cw; /* char width  */
 258         char state; /* focus, redraw, visible */
 259 } XWindow;
 260
 261 typedef struct {
 262         uint b;
 263         uint mask;
 264         char *s;
 265 } Mousekey;
 266
 267 typedef struct {
 268         KeySym k;
 269         uint mask;
 270         char *s;
 271         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 272         signed char appkey;    /* application keypad */
 273         signed char appcursor; /* application cursor */
 274         signed char crlf;      /* crlf mode          */
 275 } Key;
 276
 277 typedef struct {
 278         int mode;
 279         int type;
 280         int snap;
 281         /*
 282          * Selection variables:
 283          * nb – normalized coordinates of the beginning of the selection
 284          * ne – normalized coordinates of the end of the selection
 285          * ob – original coordinates of the beginning of the selection
 286          * oe – original coordinates of the end of the selection
 287          */
 288         struct {
 289                 int x, y;
 290         } nb, ne, ob, oe;
 291
 292         char *clip;
 293         Atom xtarget;
 294         bool alt;
 295         struct timeval tclick1;
 296         struct timeval tclick2;
 297 } Selection;
 298
 299 typedef union {
 300         int i;
 301         unsigned int ui;
 302         float f;
 303         const void *v;
 304 } Arg;
 305
 306 typedef struct {
 307         unsigned int mod;
 308         KeySym keysym;
 309         void (*func)(const Arg *);
 310         const Arg arg;
 311 } Shortcut;
 312
 313 /* function definitions used in config.h */
 314 static void clippaste(const Arg *);
 315 static void numlock(const Arg *);
 316 static void selpaste(const Arg *);
 317 static void xzoom(const Arg *);
 318 static void printsel(const Arg *);
 319 static void printscreen(const Arg *) ;
 320 static void toggleprinter(const Arg *);
 321
 322 /* Config.h for applying patches and the configuration. */
 323 #include "config.h"
 324
 325 /* Font structure */
 326 typedef struct {
 327         int height;
 328         int width;
 329         int ascent;
 330         int descent;
 331         short lbearing;
 332         short rbearing;
 333         XftFont *match;
 334         FcFontSet *set;
 335         FcPattern *pattern;
 336 } Font;
 337
 338 /* Drawing Context */
 339 typedef struct {
 340         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 341         Font font, bfont, ifont, ibfont;
 342         GC gc;
 343 } DC;
 344
 345 static void die(const char *, ...);
 346 static void draw(void);
 347 static void redraw(int);
 348 static void drawregion(int, int, int, int);
 349 static void execsh(void);
 350 static void sigchld(int);
 351 static void run(void);
 352
 353 static void csidump(void);
 354 static void csihandle(void);
 355 static void csiparse(void);
 356 static void csireset(void);
 357 static void strdump(void);
 358 static void strhandle(void);
 359 static void strparse(void);
 360 static void strreset(void);
 361
 362 static int tattrset(int);
 363 static void tprinter(char *s, size_t len);
 364 static void tdumpsel(void);
 365 static void tdumpline(int);
 366 static void tdump(void);
 367 static void tclearregion(int, int, int, int);
 368 static void tcursor(int);
 369 static void tdeletechar(int);
 370 static void tdeleteline(int);
 371 static void tinsertblank(int);
 372 static void tinsertblankline(int);
 373 static void tmoveto(int, int);
 374 static void tmoveato(int x, int y);
 375 static void tnew(int, int);
 376 static void tnewline(int);
 377 static void tputtab(bool);
 378 static void tputc(char *, int);
 379 static void treset(void);
 380 static int tresize(int, int);
 381 static void tscrollup(int, int);
 382 static void tscrolldown(int, int);
 383 static void tsetattr(int*, int);
 384 static void tsetchar(char *, Glyph *, int, int);
 385 static void tsetscroll(int, int);
 386 static void tswapscreen(void);
 387 static void tsetdirt(int, int);
 388 static void tsetdirtattr(int);
 389 static void tsetmode(bool, bool, int *, int);
 390 static void tfulldirt(void);
 391 static void techo(char *, int);
 392 static int32_t tdefcolor(int *, int *, int);
 393 static void tselcs(void);
 394 static void tdeftran(char);
 395 static inline bool match(uint, uint);
 396 static void ttynew(void);
 397 static void ttyread(void);
 398 static void ttyresize(void);
 399 static void ttysend(char *, size_t);
 400 static void ttywrite(const char *, size_t);
 401
 402 static void xdraws(char *, Glyph, int, int, int, int);
 403 static void xhints(void);
 404 static void xclear(int, int, int, int);
 405 static void xdrawcursor(void);
 406 static void xinit(void);
 407 static void xloadcols(void);
 408 static int xsetcolorname(int, const char *);
 409 static int xloadfont(Font *, FcPattern *);
 410 static void xloadfonts(char *, double);
 411 static int xloadfontset(Font *);
 412 static void xsettitle(char *);
 413 static void xresettitle(void);
 414 static void xsetpointermotion(int);
 415 static void xseturgency(int);
 416 static void xsetsel(char*);
 417 static void xtermclear(int, int, int, int);
 418 static void xunloadfont(Font *f);
 419 static void xunloadfonts(void);
 420 static void xresize(int, int);
 421
 422 static void expose(XEvent *);
 423 static void visibility(XEvent *);
 424 static void unmap(XEvent *);
 425 static char *kmap(KeySym, uint);
 426 static void kpress(XEvent *);
 427 static void cmessage(XEvent *);
 428 static void cresize(int, int);
 429 static void resize(XEvent *);
 430 static void focus(XEvent *);
 431 static void brelease(XEvent *);
 432 static void bpress(XEvent *);
 433 static void bmotion(XEvent *);
 434 static void selnotify(XEvent *);
 435 static void selclear(XEvent *);
 436 static void selrequest(XEvent *);
 437
 438 static void selinit(void);
 439 static void selsort(void);
 440 static inline bool selected(int, int);
 441 static char *getsel(void);
 442 static void selcopy(void);
 443 static void selscroll(int, int);
 444 static void selsnap(int, int *, int *, int);
 445
 446 static size_t utf8decode(char *, long *, size_t);
 447 static long utf8decodebyte(char, size_t *);
 448 static size_t utf8encode(long, char *, size_t);
 449 static char utf8encodebyte(long, size_t);
 450 static size_t utf8len(char *);
 451 static size_t utf8validate(long *, size_t);
 452
 453 static ssize_t xwrite(int, char *, size_t);
 454 static void *xmalloc(size_t);
 455 static void *xrealloc(void *, size_t);
 456 static char *xstrdup(char *s);
 457
 458 static void (*handler[LASTEvent])(XEvent *) = {
 459         [KeyPress] = kpress,
 460         [ClientMessage] = cmessage,
 461         [ConfigureNotify] = resize,
 462         [VisibilityNotify] = visibility,
 463         [UnmapNotify] = unmap,
 464         [Expose] = expose,
 465         [FocusIn] = focus,
 466         [FocusOut] = focus,
 467         [MotionNotify] = bmotion,
 468         [ButtonPress] = bpress,
 469         [ButtonRelease] = brelease,
 470         [SelectionClear] = selclear,
 471         [SelectionNotify] = selnotify,
 472         [SelectionRequest] = selrequest,
 473 };
 474
 475 /* Globals */
 476 static DC dc;
 477 static XWindow xw;
 478 static Term term;
 479 static CSIEscape csiescseq;
 480 static STREscape strescseq;
 481 static int cmdfd;
 482 static pid_t pid;
 483 static Selection sel;
 484 static int iofd = STDOUT_FILENO;
 485 static char **opt_cmd = NULL;
 486 static char *opt_io = NULL;
 487 static char *opt_title = NULL;
 488 static char *opt_embed = NULL;
 489 static char *opt_class = NULL;
 490 static char *opt_font = NULL;
 491 static int oldbutton = 3; /* button event on startup: 3 = release */
 492
 493 static char *usedfont = NULL;
 494 static double usedfontsize = 0;
 495
 496 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 497 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 498 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 499 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 500
 501 /* Font Ring Cache */
 502 enum {
 503         FRC_NORMAL,
 504         FRC_ITALIC,
 505         FRC_BOLD,
 506         FRC_ITALICBOLD
 507 };
 508
 509 typedef struct {
 510         XftFont *font;
 511         int flags;
 512 } Fontcache;
 513
 514 /* Fontcache is an array now. A new font will be appended to the array. */
 515 static Fontcache frc[16];
 516 static int frclen = 0;
 517
 518 ssize_t
 519 xwrite(int fd, char *s, size_t len) {
 520         size_t aux = len;
 521
 522         while(len > 0) {
 523                 ssize_t r = write(fd, s, len);
 524                 if(r < 0)
 525                         return r;
 526                 len -= r;
 527                 s += r;
 528         }
 529         return aux;
 530 }
 531
 532 void *
 533 xmalloc(size_t len) {
 534         void *p = malloc(len);
 535
 536         if(!p)
 537                 die("Out of memory\n");
 538
 539         return p;
 540 }
 541
 542 void *
 543 xrealloc(void *p, size_t len) {
 544         if((p = realloc(p, len)) == NULL)
 545                 die("Out of memory\n");
 546
 547         return p;
 548 }
 549
 550 char *
 551 xstrdup(char *s) {
 552         char *p = strdup(s);
 553
 554         if (!p)
 555                 die("Out of memory\n");
 556
 557         return p;
 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 selcopy:
 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         }
1232 }
1233
1234 void
1235 dump(char c) {
1236         static int col;
1237
1238         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1239         if(++col % 10 == 0)
1240                 fprintf(stderr, "\n");
1241 }
1242
1243 void
1244 ttyread(void) {
1245         static char buf[BUFSIZ];
1246         static int buflen = 0;
1247         char *ptr;
1248         char s[UTF_SIZ];
1249         int charsize; /* size of utf8 char in bytes */
1250         long unicodep;
1251         int ret;
1252
1253         /* append read bytes to unprocessed bytes */
1254         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1255                 die("Couldn't read from shell: %s\n", strerror(errno));
1256
1257         /* process every complete utf8 char */
1258         buflen += ret;
1259         ptr = buf;
1260         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1261                 utf8encode(unicodep, s, UTF_SIZ);
1262                 tputc(s, charsize);
1263                 ptr += charsize;
1264                 buflen -= charsize;
1265         }
1266
1267         /* keep any uncomplete utf8 char for the next call */
1268         memmove(buf, ptr, buflen);
1269 }
1270
1271 void
1272 ttywrite(const char *s, size_t n) {
1273         if(write(cmdfd, s, n) == -1)
1274                 die("write error on tty: %s\n", strerror(errno));
1275 }
1276
1277 void
1278 ttysend(char *s, size_t n) {
1279         ttywrite(s, n);
1280         if(IS_SET(MODE_ECHO))
1281                 techo(s, n);
1282 }
1283
1284 void
1285 ttyresize(void) {
1286         struct winsize w;
1287
1288         w.ws_row = term.row;
1289         w.ws_col = term.col;
1290         w.ws_xpixel = xw.tw;
1291         w.ws_ypixel = xw.th;
1292         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1293                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1294 }
1295
1296 int
1297 tattrset(int attr) {
1298         int i, j;
1299
1300         for(i = 0; i < term.row-1; i++) {
1301                 for(j = 0; j < term.col-1; j++) {
1302                         if(term.line[i][j].mode & attr)
1303                                 return 1;
1304                 }
1305         }
1306
1307         return 0;
1308 }
1309
1310 void
1311 tsetdirt(int top, int bot) {
1312         int i;
1313
1314         LIMIT(top, 0, term.row-1);
1315         LIMIT(bot, 0, term.row-1);
1316
1317         for(i = top; i <= bot; i++)
1318                 term.dirty[i] = 1;
1319 }
1320
1321 void
1322 tsetdirtattr(int attr) {
1323         int i, j;
1324
1325         for(i = 0; i < term.row-1; i++) {
1326                 for(j = 0; j < term.col-1; j++) {
1327                         if(term.line[i][j].mode & attr) {
1328                                 tsetdirt(i, i);
1329                                 break;
1330                         }
1331                 }
1332         }
1333 }
1334
1335 void
1336 tfulldirt(void) {
1337         tsetdirt(0, term.row-1);
1338 }
1339
1340 void
1341 tcursor(int mode) {
1342         static TCursor c[2];
1343         bool alt = IS_SET(MODE_ALTSCREEN);
1344
1345         if(mode == CURSOR_SAVE) {
1346                 c[alt] = term.c;
1347         } else if(mode == CURSOR_LOAD) {
1348                 term.c = c[alt];
1349                 tmoveto(c[alt].x, c[alt].y);
1350         }
1351 }
1352
1353 void
1354 treset(void) {
1355         uint i;
1356
1357         term.c = (TCursor){{
1358                 .mode = ATTR_NULL,
1359                 .fg = defaultfg,
1360                 .bg = defaultbg
1361         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1362
1363         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1364         for(i = tabspaces; i < term.col; i += tabspaces)
1365                 term.tabs[i] = 1;
1366         term.top = 0;
1367         term.bot = term.row - 1;
1368         term.mode = MODE_WRAP;
1369         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1370         term.charset = 0;
1371
1372         tclearregion(0, 0, term.col-1, term.row-1);
1373         tmoveto(0, 0);
1374         tcursor(CURSOR_SAVE);
1375 }
1376
1377 void
1378 tnew(int col, int row) {
1379         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1380         tresize(col, row);
1381         term.numlock = 1;
1382
1383         treset();
1384 }
1385
1386 void
1387 tswapscreen(void) {
1388         Line *tmp = term.line;
1389
1390         term.line = term.alt;
1391         term.alt = tmp;
1392         term.mode ^= MODE_ALTSCREEN;
1393         tfulldirt();
1394 }
1395
1396 void
1397 tscrolldown(int orig, int n) {
1398         int i;
1399         Line temp;
1400
1401         LIMIT(n, 0, term.bot-orig+1);
1402
1403         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1404
1405         for(i = term.bot; i >= orig+n; i--) {
1406                 temp = term.line[i];
1407                 term.line[i] = term.line[i-n];
1408                 term.line[i-n] = temp;
1409
1410                 term.dirty[i] = 1;
1411                 term.dirty[i-n] = 1;
1412         }
1413
1414         selscroll(orig, n);
1415 }
1416
1417 void
1418 tscrollup(int orig, int n) {
1419         int i;
1420         Line temp;
1421         LIMIT(n, 0, term.bot-orig+1);
1422
1423         tclearregion(0, orig, term.col-1, orig+n-1);
1424
1425         for(i = orig; i <= term.bot-n; i++) {
1426                  temp = term.line[i];
1427                  term.line[i] = term.line[i+n];
1428                  term.line[i+n] = temp;
1429
1430                  term.dirty[i] = 1;
1431                  term.dirty[i+n] = 1;
1432         }
1433
1434         selscroll(orig, -n);
1435 }
1436
1437 void
1438 selscroll(int orig, int n) {
1439         if(sel.ob.x == -1)
1440                 return;
1441
1442         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1443                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1444                         selclear(NULL);
1445                         return;
1446                 }
1447                 if(sel.type == SEL_RECTANGULAR) {
1448                         if(sel.ob.y < term.top)
1449                                 sel.ob.y = term.top;
1450                         if(sel.oe.y > term.bot)
1451                                 sel.oe.y = term.bot;
1452                 } else {
1453                         if(sel.ob.y < term.top) {
1454                                 sel.ob.y = term.top;
1455                                 sel.ob.x = 0;
1456                         }
1457                         if(sel.oe.y > term.bot) {
1458                                 sel.oe.y = term.bot;
1459                                 sel.oe.x = term.col;
1460                         }
1461                 }
1462                 selsort();
1463         }
1464 }
1465
1466 void
1467 tnewline(int first_col) {
1468         int y = term.c.y;
1469
1470         if(y == term.bot) {
1471                 tscrollup(term.top, 1);
1472         } else {
1473                 y++;
1474         }
1475         tmoveto(first_col ? 0 : term.c.x, y);
1476 }
1477
1478 void
1479 csiparse(void) {
1480         char *p = csiescseq.buf, *np;
1481         long int v;
1482
1483         csiescseq.narg = 0;
1484         if(*p == '?') {
1485                 csiescseq.priv = 1;
1486                 p++;
1487         }
1488
1489         csiescseq.buf[csiescseq.len] = '\0';
1490         while(p < csiescseq.buf+csiescseq.len) {
1491                 np = NULL;
1492                 v = strtol(p, &np, 10);
1493                 if(np == p)
1494                         v = 0;
1495                 if(v == LONG_MAX || v == LONG_MIN)
1496                         v = -1;
1497                 csiescseq.arg[csiescseq.narg++] = v;
1498                 p = np;
1499                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1500                         break;
1501                 p++;
1502         }
1503         csiescseq.mode = *p;
1504 }
1505
1506 /* for absolute user moves, when decom is set */
1507 void
1508 tmoveato(int x, int y) {
1509         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1510 }
1511
1512 void
1513 tmoveto(int x, int y) {
1514         int miny, maxy;
1515
1516         if(term.c.state & CURSOR_ORIGIN) {
1517                 miny = term.top;
1518                 maxy = term.bot;
1519         } else {
1520                 miny = 0;
1521                 maxy = term.row - 1;
1522         }
1523         LIMIT(x, 0, term.col-1);
1524         LIMIT(y, miny, maxy);
1525         term.c.state &= ~CURSOR_WRAPNEXT;
1526         term.c.x = x;
1527         term.c.y = y;
1528 }
1529
1530 void
1531 tsetchar(char *c, Glyph *attr, int x, int y) {
1532         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1533                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1534                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1535                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1536                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1537                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1538                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1539                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1540                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1541         };
1542
1543         /*
1544          * The table is proudly stolen from rxvt.
1545          */
1546         if(attr->mode & ATTR_GFX) {
1547                 if(c[0] >= 0x41 && c[0] <= 0x7e
1548                                 && vt100_0[c[0] - 0x41]) {
1549                         c = vt100_0[c[0] - 0x41];
1550                 }
1551         }
1552
1553         if(term.line[y][x].mode & ATTR_WIDE) {
1554                 if(x+1 < term.col) {
1555                         term.line[y][x+1].c[0] = ' ';
1556                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1557                 }
1558         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1559                 term.line[y][x-1].c[0] = ' ';
1560                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1561         }
1562
1563         term.dirty[y] = 1;
1564         term.line[y][x] = *attr;
1565         memcpy(term.line[y][x].c, c, UTF_SIZ);
1566 }
1567
1568 void
1569 tclearregion(int x1, int y1, int x2, int y2) {
1570         int x, y, temp;
1571
1572         if(x1 > x2)
1573                 temp = x1, x1 = x2, x2 = temp;
1574         if(y1 > y2)
1575                 temp = y1, y1 = y2, y2 = temp;
1576
1577         LIMIT(x1, 0, term.col-1);
1578         LIMIT(x2, 0, term.col-1);
1579         LIMIT(y1, 0, term.row-1);
1580         LIMIT(y2, 0, term.row-1);
1581
1582         for(y = y1; y <= y2; y++) {
1583                 term.dirty[y] = 1;
1584                 for(x = x1; x <= x2; x++) {
1585                         if(selected(x, y))
1586                                 selclear(NULL);
1587                         term.line[y][x] = term.c.attr;
1588                         memcpy(term.line[y][x].c, " ", 2);
1589                 }
1590         }
1591 }
1592
1593 void
1594 tdeletechar(int n) {
1595         int src = term.c.x + n;
1596         int dst = term.c.x;
1597         int size = term.col - src;
1598
1599         term.dirty[term.c.y] = 1;
1600
1601         if(src >= term.col) {
1602                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1603                 return;
1604         }
1605
1606         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1607                         size * sizeof(Glyph));
1608         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1609 }
1610
1611 void
1612 tinsertblank(int n) {
1613         int src = term.c.x;
1614         int dst = src + n;
1615         int size = term.col - dst;
1616
1617         term.dirty[term.c.y] = 1;
1618
1619         if(dst >= term.col) {
1620                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1621                 return;
1622         }
1623
1624         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1625                         size * sizeof(Glyph));
1626         tclearregion(src, term.c.y, dst - 1, term.c.y);
1627 }
1628
1629 void
1630 tinsertblankline(int n) {
1631         if(BETWEEN(term.c.y, term.top, term.bot))
1632                 tscrolldown(term.c.y, n);
1633 }
1634
1635 void
1636 tdeleteline(int n) {
1637         if(BETWEEN(term.c.y, term.top, term.bot))
1638                 tscrollup(term.c.y, n);
1639 }
1640
1641 int32_t
1642 tdefcolor(int *attr, int *npar, int l) {
1643         int32_t idx = -1;
1644         uint r, g, b;
1645
1646         switch (attr[*npar + 1]) {
1647         case 2: /* direct colour in RGB space */
1648                 if (*npar + 4 >= l) {
1649                         fprintf(stderr,
1650                                 "erresc(38): Incorrect number of parameters (%d)\n",
1651                                 *npar);
1652                         break;
1653                 }
1654                 r = attr[*npar + 2];
1655                 g = attr[*npar + 3];
1656                 b = attr[*npar + 4];
1657                 *npar += 4;
1658                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1659                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1660                                 r, g, b);
1661                 else
1662                         idx = TRUECOLOR(r, g, b);
1663                 break;
1664         case 5: /* indexed colour */
1665                 if (*npar + 2 >= l) {
1666                         fprintf(stderr,
1667                                 "erresc(38): Incorrect number of parameters (%d)\n",
1668                                 *npar);
1669                         break;
1670                 }
1671                 *npar += 2;
1672                 if(!BETWEEN(attr[*npar], 0, 255))
1673                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1674                 else
1675                         idx = attr[*npar];
1676                 break;
1677         case 0: /* implemented defined (only foreground) */
1678         case 1: /* transparent */
1679         case 3: /* direct colour in CMY space */
1680         case 4: /* direct colour in CMYK space */
1681         default:
1682                 fprintf(stderr,
1683                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1684         }
1685
1686         return idx;
1687 }
1688
1689 void
1690 tsetattr(int *attr, int l) {
1691         int i;
1692         int32_t idx;
1693
1694         for(i = 0; i < l; i++) {
1695                 switch(attr[i]) {
1696                 case 0:
1697                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1698                                         | ATTR_BOLD | ATTR_ITALIC \
1699                                         | ATTR_BLINK);
1700                         term.c.attr.fg = defaultfg;
1701                         term.c.attr.bg = defaultbg;
1702                         break;
1703                 case 1:
1704                         term.c.attr.mode |= ATTR_BOLD;
1705                         break;
1706                 case 3:
1707                         term.c.attr.mode |= ATTR_ITALIC;
1708                         break;
1709                 case 4:
1710                         term.c.attr.mode |= ATTR_UNDERLINE;
1711                         break;
1712                 case 5: /* slow blink */
1713                 case 6: /* rapid blink */
1714                         term.c.attr.mode |= ATTR_BLINK;
1715                         break;
1716                 case 7:
1717                         term.c.attr.mode |= ATTR_REVERSE;
1718                         break;
1719                 case 21:
1720                 case 22:
1721                         term.c.attr.mode &= ~ATTR_BOLD;
1722                         break;
1723                 case 23:
1724                         term.c.attr.mode &= ~ATTR_ITALIC;
1725                         break;
1726                 case 24:
1727                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1728                         break;
1729                 case 25:
1730                 case 26:
1731                         term.c.attr.mode &= ~ATTR_BLINK;
1732                         break;
1733                 case 27:
1734                         term.c.attr.mode &= ~ATTR_REVERSE;
1735                         break;
1736                 case 38:
1737                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1738                                 term.c.attr.fg = idx;
1739                         break;
1740                 case 39:
1741                         term.c.attr.fg = defaultfg;
1742                         break;
1743                 case 48:
1744                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1745                                 term.c.attr.bg = idx;
1746                         break;
1747                 case 49:
1748                         term.c.attr.bg = defaultbg;
1749                         break;
1750                 default:
1751                         if(BETWEEN(attr[i], 30, 37)) {
1752                                 term.c.attr.fg = attr[i] - 30;
1753                         } else if(BETWEEN(attr[i], 40, 47)) {
1754                                 term.c.attr.bg = attr[i] - 40;
1755                         } else if(BETWEEN(attr[i], 90, 97)) {
1756                                 term.c.attr.fg = attr[i] - 90 + 8;
1757                         } else if(BETWEEN(attr[i], 100, 107)) {
1758                                 term.c.attr.bg = attr[i] - 100 + 8;
1759                         } else {
1760                                 fprintf(stderr,
1761                                         "erresc(default): gfx attr %d unknown\n",
1762                                         attr[i]), csidump();
1763                         }
1764                         break;
1765                 }
1766         }
1767 }
1768
1769 void
1770 tsetscroll(int t, int b) {
1771         int temp;
1772
1773         LIMIT(t, 0, term.row-1);
1774         LIMIT(b, 0, term.row-1);
1775         if(t > b) {
1776                 temp = t;
1777                 t = b;
1778                 b = temp;
1779         }
1780         term.top = t;
1781         term.bot = b;
1782 }
1783
1784 void
1785 tsetmode(bool priv, bool set, int *args, int narg) {
1786         int *lim, mode;
1787         bool alt;
1788
1789         for(lim = args + narg; args < lim; ++args) {
1790                 if(priv) {
1791                         switch(*args) {
1792                                 break;
1793                         case 1: /* DECCKM -- Cursor key */
1794                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1795                                 break;
1796                         case 5: /* DECSCNM -- Reverse video */
1797                                 mode = term.mode;
1798                                 MODBIT(term.mode, set, MODE_REVERSE);
1799                                 if(mode != term.mode)
1800                                         redraw(REDRAW_TIMEOUT);
1801                                 break;
1802                         case 6: /* DECOM -- Origin */
1803                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1804                                 tmoveato(0, 0);
1805                                 break;
1806                         case 7: /* DECAWM -- Auto wrap */
1807                                 MODBIT(term.mode, set, MODE_WRAP);
1808                                 break;
1809                         case 0:  /* Error (IGNORED) */
1810                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1811                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1812                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1813                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1814                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1815                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1816                         case 42: /* DECNRCM -- National characters (IGNORED) */
1817                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1818                                 break;
1819                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1820                                 MODBIT(term.mode, !set, MODE_HIDE);
1821                                 break;
1822                         case 9:    /* X10 mouse compatibility mode */
1823                                 xsetpointermotion(0);
1824                                 MODBIT(term.mode, 0, MODE_MOUSE);
1825                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1826                                 break;
1827                         case 1000: /* 1000: report button press */
1828                                 xsetpointermotion(0);
1829                                 MODBIT(term.mode, 0, MODE_MOUSE);
1830                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1831                                 break;
1832                         case 1002: /* 1002: report motion on button press */
1833                                 xsetpointermotion(0);
1834                                 MODBIT(term.mode, 0, MODE_MOUSE);
1835                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1836                                 break;
1837                         case 1003: /* 1003: enable all mouse motions */
1838                                 xsetpointermotion(set);
1839                                 MODBIT(term.mode, 0, MODE_MOUSE);
1840                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1841                                 break;
1842                         case 1004: /* 1004: send focus events to tty */
1843                                 MODBIT(term.mode, set, MODE_FOCUS);
1844                                 break;
1845                         case 1006: /* 1006: extended reporting mode */
1846                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1847                                 break;
1848                         case 1034:
1849                                 MODBIT(term.mode, set, MODE_8BIT);
1850                                 break;
1851                         case 1049: /* swap screen & set/restore cursor as xterm */
1852                                 if (!allowaltscreen)
1853                                         break;
1854                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1855                                 /* FALLTHRU */
1856                         case 47: /* swap screen */
1857                         case 1047:
1858                                 if (!allowaltscreen)
1859                                         break;
1860                                 alt = IS_SET(MODE_ALTSCREEN);
1861                                 if(alt) {
1862                                         tclearregion(0, 0, term.col-1,
1863                                                         term.row-1);
1864                                 }
1865                                 if(set ^ alt) /* set is always 1 or 0 */
1866                                         tswapscreen();
1867                                 if(*args != 1049)
1868                                         break;
1869                                 /* FALLTRU */
1870                         case 1048:
1871                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1872                                 break;
1873                         case 2004: /* 2004: bracketed paste mode */
1874                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1875                                 break;
1876                         /* Not implemented mouse modes. See comments there. */
1877                         case 1001: /* mouse highlight mode; can hang the
1878                                       terminal by design when implemented. */
1879                         case 1005: /* UTF-8 mouse mode; will confuse
1880                                       applications not supporting UTF-8
1881                                       and luit. */
1882                         case 1015: /* urxvt mangled mouse mode; incompatible
1883                                       and can be mistaken for other control
1884                                       codes. */
1885                         default:
1886                                 fprintf(stderr,
1887                                         "erresc: unknown private set/reset mode %d\n",
1888                                         *args);
1889                                 break;
1890                         }
1891                 } else {
1892                         switch(*args) {
1893                         case 0:  /* Error (IGNORED) */
1894                                 break;
1895                         case 2:  /* KAM -- keyboard action */
1896                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1897                                 break;
1898                         case 4:  /* IRM -- Insertion-replacement */
1899                                 MODBIT(term.mode, set, MODE_INSERT);
1900                                 break;
1901                         case 12: /* SRM -- Send/Receive */
1902                                 MODBIT(term.mode, !set, MODE_ECHO);
1903                                 break;
1904                         case 20: /* LNM -- Linefeed/new line */
1905                                 MODBIT(term.mode, set, MODE_CRLF);
1906                                 break;
1907                         default:
1908                                 fprintf(stderr,
1909                                         "erresc: unknown set/reset mode %d\n",
1910                                         *args);
1911                                 break;
1912                         }
1913                 }
1914         }
1915 }
1916
1917 void
1918 csihandle(void) {
1919         char buf[40];
1920         int len;
1921
1922         switch(csiescseq.mode) {
1923         default:
1924         unknown:
1925                 fprintf(stderr, "erresc: unknown csi ");
1926                 csidump();
1927                 /* die(""); */
1928                 break;
1929         case '@': /* ICH -- Insert <n> blank char */
1930                 DEFAULT(csiescseq.arg[0], 1);
1931                 tinsertblank(csiescseq.arg[0]);
1932                 break;
1933         case 'A': /* CUU -- Cursor <n> Up */
1934                 DEFAULT(csiescseq.arg[0], 1);
1935                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1936                 break;
1937         case 'B': /* CUD -- Cursor <n> Down */
1938         case 'e': /* VPR --Cursor <n> Down */
1939                 DEFAULT(csiescseq.arg[0], 1);
1940                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1941                 break;
1942         case 'i': /* MC -- Media Copy */
1943                 switch(csiescseq.arg[0]) {
1944                 case 0:
1945                         tdump();
1946                         break;
1947                 case 1:
1948                         tdumpline(term.c.y);
1949                         break;
1950                 case 2:
1951                         tdumpsel();
1952                         break;
1953                 case 4:
1954                         term.mode &= ~MODE_PRINT;
1955                         break;
1956                 case 5:
1957                         term.mode |= MODE_PRINT;
1958                         break;
1959                 }
1960                 break;
1961         case 'c': /* DA -- Device Attributes */
1962                 if(csiescseq.arg[0] == 0)
1963                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1964                 break;
1965         case 'C': /* CUF -- Cursor <n> Forward */
1966         case 'a': /* HPR -- Cursor <n> Forward */
1967                 DEFAULT(csiescseq.arg[0], 1);
1968                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1969                 break;
1970         case 'D': /* CUB -- Cursor <n> Backward */
1971                 DEFAULT(csiescseq.arg[0], 1);
1972                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1973                 break;
1974         case 'E': /* CNL -- Cursor <n> Down and first col */
1975                 DEFAULT(csiescseq.arg[0], 1);
1976                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1977                 break;
1978         case 'F': /* CPL -- Cursor <n> Up and first col */
1979                 DEFAULT(csiescseq.arg[0], 1);
1980                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1981                 break;
1982         case 'g': /* TBC -- Tabulation clear */
1983                 switch(csiescseq.arg[0]) {
1984                 case 0: /* clear current tab stop */
1985                         term.tabs[term.c.x] = 0;
1986                         break;
1987                 case 3: /* clear all the tabs */
1988                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1989                         break;
1990                 default:
1991                         goto unknown;
1992                 }
1993                 break;
1994         case 'G': /* CHA -- Move to <col> */
1995         case '`': /* HPA */
1996                 DEFAULT(csiescseq.arg[0], 1);
1997                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1998                 break;
1999         case 'H': /* CUP -- Move to <row> <col> */
2000         case 'f': /* HVP */
2001                 DEFAULT(csiescseq.arg[0], 1);
2002                 DEFAULT(csiescseq.arg[1], 1);
2003                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2004                 break;
2005         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2006                 DEFAULT(csiescseq.arg[0], 1);
2007                 while(csiescseq.arg[0]--)
2008                         tputtab(1);
2009                 break;
2010         case 'J': /* ED -- Clear screen */
2011                 selclear(NULL);
2012                 switch(csiescseq.arg[0]) {
2013                 case 0: /* below */
2014                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2015                         if(term.c.y < term.row-1) {
2016                                 tclearregion(0, term.c.y+1, term.col-1,
2017                                                 term.row-1);
2018                         }
2019                         break;
2020                 case 1: /* above */
2021                         if(term.c.y > 1)
2022                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2023                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2024                         break;
2025                 case 2: /* all */
2026                         tclearregion(0, 0, term.col-1, term.row-1);
2027                         break;
2028                 default:
2029                         goto unknown;
2030                 }
2031                 break;
2032         case 'K': /* EL -- Clear line */
2033                 switch(csiescseq.arg[0]) {
2034                 case 0: /* right */
2035                         tclearregion(term.c.x, term.c.y, term.col-1,
2036                                         term.c.y);
2037                         break;
2038                 case 1: /* left */
2039                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2040                         break;
2041                 case 2: /* all */
2042                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2043                         break;
2044                 }
2045                 break;
2046         case 'S': /* SU -- Scroll <n> line up */
2047                 DEFAULT(csiescseq.arg[0], 1);
2048                 tscrollup(term.top, csiescseq.arg[0]);
2049                 break;
2050         case 'T': /* SD -- Scroll <n> line down */
2051                 DEFAULT(csiescseq.arg[0], 1);
2052                 tscrolldown(term.top, csiescseq.arg[0]);
2053                 break;
2054         case 'L': /* IL -- Insert <n> blank lines */
2055                 DEFAULT(csiescseq.arg[0], 1);
2056                 tinsertblankline(csiescseq.arg[0]);
2057                 break;
2058         case 'l': /* RM -- Reset Mode */
2059                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2060                 break;
2061         case 'M': /* DL -- Delete <n> lines */
2062                 DEFAULT(csiescseq.arg[0], 1);
2063                 tdeleteline(csiescseq.arg[0]);
2064                 break;
2065         case 'X': /* ECH -- Erase <n> char */
2066                 DEFAULT(csiescseq.arg[0], 1);
2067                 tclearregion(term.c.x, term.c.y,
2068                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2069                 break;
2070         case 'P': /* DCH -- Delete <n> char */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tdeletechar(csiescseq.arg[0]);
2073                 break;
2074         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2075                 DEFAULT(csiescseq.arg[0], 1);
2076                 while(csiescseq.arg[0]--)
2077                         tputtab(0);
2078                 break;
2079         case 'd': /* VPA -- Move to <row> */
2080                 DEFAULT(csiescseq.arg[0], 1);
2081                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2082                 break;
2083         case 'h': /* SM -- Set terminal mode */
2084                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2085                 break;
2086         case 'm': /* SGR -- Terminal attribute (color) */
2087                 tsetattr(csiescseq.arg, csiescseq.narg);
2088                 break;
2089         case 'n': /* DSR – Device Status Report (cursor position) */
2090                 if (csiescseq.arg[0] == 6) {
2091                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2092                                         term.c.y+1, term.c.x+1);
2093                         ttywrite(buf, len);
2094                         break;
2095                 }
2096         case 'r': /* DECSTBM -- Set Scrolling Region */
2097                 if(csiescseq.priv) {
2098                         goto unknown;
2099                 } else {
2100                         DEFAULT(csiescseq.arg[0], 1);
2101                         DEFAULT(csiescseq.arg[1], term.row);
2102                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2103                         tmoveato(0, 0);
2104                 }
2105                 break;
2106         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2107                 tcursor(CURSOR_SAVE);
2108                 break;
2109         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2110                 tcursor(CURSOR_LOAD);
2111                 break;
2112         }
2113 }
2114
2115 void
2116 csidump(void) {
2117         int i;
2118         uint c;
2119
2120         printf("ESC[");
2121         for(i = 0; i < csiescseq.len; i++) {
2122                 c = csiescseq.buf[i] & 0xff;
2123                 if(isprint(c)) {
2124                         putchar(c);
2125                 } else if(c == '\n') {
2126                         printf("(\\n)");
2127                 } else if(c == '\r') {
2128                         printf("(\\r)");
2129                 } else if(c == 0x1b) {
2130                         printf("(\\e)");
2131                 } else {
2132                         printf("(%02x)", c);
2133                 }
2134         }
2135         putchar('\n');
2136 }
2137
2138 void
2139 csireset(void) {
2140         memset(&csiescseq, 0, sizeof(csiescseq));
2141 }
2142
2143 void
2144 strhandle(void) {
2145         char *p = NULL;
2146         int j, narg, par;
2147
2148         strparse();
2149         narg = strescseq.narg;
2150         par = atoi(strescseq.args[0]);
2151
2152         switch(strescseq.type) {
2153         case ']': /* OSC -- Operating System Command */
2154                 switch(par) {
2155                 case 0:
2156                 case 1:
2157                 case 2:
2158                         if(narg > 1)
2159                                 xsettitle(strescseq.args[1]);
2160                         return;
2161                 case 4: /* color set */
2162                         if(narg < 3)
2163                                 break;
2164                         p = strescseq.args[2];
2165                         /* fall through */
2166                 case 104: /* color reset, here p = NULL */
2167                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2168                         if (!xsetcolorname(j, p)) {
2169                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2170                         } else {
2171                                 /*
2172                                  * TODO if defaultbg color is changed, borders
2173                                  * are dirty
2174                                  */
2175                                 redraw(0);
2176                         }
2177                         return;
2178                 }
2179                 break;
2180         case 'k': /* old title set compatibility */
2181                 xsettitle(strescseq.args[0]);
2182                 return;
2183         case 'P': /* DSC -- Device Control String */
2184         case '_': /* APC -- Application Program Command */
2185         case '^': /* PM -- Privacy Message */
2186                 return;
2187         }
2188
2189         fprintf(stderr, "erresc: unknown str ");
2190         strdump();
2191 }
2192
2193 void
2194 strparse(void) {
2195         char *p = strescseq.buf;
2196
2197         strescseq.narg = 0;
2198         strescseq.buf[strescseq.len] = '\0';
2199         while(p && strescseq.narg < STR_ARG_SIZ)
2200                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2201 }
2202
2203 void
2204 strdump(void) {
2205         int i;
2206         uint c;
2207
2208         printf("ESC%c", strescseq.type);
2209         for(i = 0; i < strescseq.len; i++) {
2210                 c = strescseq.buf[i] & 0xff;
2211                 if(c == '\0') {
2212                         return;
2213                 } else if(isprint(c)) {
2214                         putchar(c);
2215                 } else if(c == '\n') {
2216                         printf("(\\n)");
2217                 } else if(c == '\r') {
2218                         printf("(\\r)");
2219                 } else if(c == 0x1b) {
2220                         printf("(\\e)");
2221                 } else {
2222                         printf("(%02x)", c);
2223                 }
2224         }
2225         printf("ESC\\\n");
2226 }
2227
2228 void
2229 strreset(void) {
2230         memset(&strescseq, 0, sizeof(strescseq));
2231 }
2232
2233 void
2234 tprinter(char *s, size_t len) {
2235         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2236                 fprintf(stderr, "Error writing in %s:%s\n",
2237                         opt_io, strerror(errno));
2238                 close(iofd);
2239                 iofd = -1;
2240         }
2241 }
2242
2243 void
2244 toggleprinter(const Arg *arg) {
2245         term.mode ^= MODE_PRINT;
2246 }
2247
2248 void
2249 printscreen(const Arg *arg) {
2250         tdump();
2251 }
2252
2253 void
2254 printsel(const Arg *arg) {
2255         tdumpsel();
2256 }
2257
2258 void
2259 tdumpsel(void)
2260 {
2261         char *ptr;
2262
2263         if((ptr = getsel())) {
2264                 tprinter(ptr, strlen(ptr));
2265                 free(ptr);
2266         }
2267 }
2268
2269 void
2270 tdumpline(int n) {
2271         Glyph *bp, *end;
2272
2273         bp = &term.line[n][0];
2274         end = &bp[term.col-1];
2275         while(end > bp && !strcmp(" ", end->c))
2276                 --end;
2277         if(bp != end || strcmp(bp->c, " ")) {
2278                 for( ;bp <= end; ++bp)
2279                         tprinter(bp->c, strlen(bp->c));
2280         }
2281         tprinter("\n", 1);
2282 }
2283
2284 void
2285 tdump(void) {
2286         int i;
2287
2288         for(i = 0; i < term.row; ++i)
2289                 tdumpline(i);
2290 }
2291
2292 void
2293 tputtab(bool forward) {
2294         uint x = term.c.x;
2295
2296         if(forward) {
2297                 if(x == term.col)
2298                         return;
2299                 for(++x; x < term.col && !term.tabs[x]; ++x)
2300                         /* nothing */ ;
2301         } else {
2302                 if(x == 0)
2303                         return;
2304                 for(--x; x > 0 && !term.tabs[x]; --x)
2305                         /* nothing */ ;
2306         }
2307         tmoveto(x, term.c.y);
2308 }
2309
2310 void
2311 techo(char *buf, int len) {
2312         for(; len > 0; buf++, len--) {
2313                 char c = *buf;
2314
2315                 if(c < '\x20') { /* control code */
2316                         if(c != '\n' && c != '\r' && c != '\t') {
2317                                 c |= '\x40';
2318                                 tputc("^", 1);
2319                         }
2320                         tputc(&c, 1);
2321                 } else {
2322                         break;
2323                 }
2324         }
2325         if(len)
2326                 tputc(buf, len);
2327 }
2328
2329 void
2330 tdeftran(char ascii) {
2331         char c, (*bp)[2];
2332         static char tbl[][2] = {
2333                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2334                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2335                 {'5', CS_FIN},      {'C', CS_FIN},
2336                 {0, 0}
2337         };
2338
2339         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2340                 /* nothing */;
2341
2342         if (c == 0)
2343                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2344         else
2345                 term.trantbl[term.icharset] = (*bp)[1];
2346 }
2347
2348 void
2349 tselcs(void) {
2350         MODBIT(term.c.attr.mode,
2351                term.trantbl[term.charset] == CS_GRAPHIC0,
2352                ATTR_GFX);
2353 }
2354
2355 void
2356 tputc(char *c, int len) {
2357         uchar ascii = *c;
2358         bool control = ascii < '\x20' || ascii == 0177;
2359         long unicodep;
2360         int width;
2361
2362         if(len == 1) {
2363                 width = 1;
2364         } else {
2365                 utf8decode(c, &unicodep, UTF_SIZ);
2366                 width = wcwidth(unicodep);
2367         }
2368
2369         if(IS_SET(MODE_PRINT))
2370                 tprinter(c, len);
2371
2372         /*
2373          * STR sequences must be checked before anything else
2374          * because it can use some control codes as part of the sequence.
2375          */
2376         if(term.esc & ESC_STR) {
2377                 switch(ascii) {
2378                 case '\033':
2379                         term.esc = ESC_START | ESC_STR_END;
2380                         break;
2381                 case '\a': /* backwards compatibility to xterm */
2382                         term.esc = 0;
2383                         strhandle();
2384                         break;
2385                 default:
2386                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2387                                 memmove(&strescseq.buf[strescseq.len], c, len);
2388                                 strescseq.len += len;
2389                         } else {
2390                         /*
2391                          * Here is a bug in terminals. If the user never sends
2392                          * some code to stop the str or esc command, then st
2393                          * will stop responding. But this is better than
2394                          * silently failing with unknown characters. At least
2395                          * then users will report back.
2396                          *
2397                          * In the case users ever get fixed, here is the code:
2398                          */
2399                         /*
2400                          * term.esc = 0;
2401                          * strhandle();
2402                          */
2403                         }
2404                 }
2405                 return;
2406         }
2407
2408         /*
2409          * Actions of control codes must be performed as soon they arrive
2410          * because they can be embedded inside a control sequence, and
2411          * they must not cause conflicts with sequences.
2412          */
2413         if(control) {
2414                 switch(ascii) {
2415                 case '\t':   /* HT */
2416                         tputtab(1);
2417                         return;
2418                 case '\b':   /* BS */
2419                         tmoveto(term.c.x-1, term.c.y);
2420                         return;
2421                 case '\r':   /* CR */
2422                         tmoveto(0, term.c.y);
2423                         return;
2424                 case '\f':   /* LF */
2425                 case '\v':   /* VT */
2426                 case '\n':   /* LF */
2427                         /* go to first col if the mode is set */
2428                         tnewline(IS_SET(MODE_CRLF));
2429                         return;
2430                 case '\a':   /* BEL */
2431                         if(!(xw.state & WIN_FOCUSED))
2432                                 xseturgency(1);
2433                         if (bellvolume)
2434                                 XBell(xw.dpy, bellvolume);
2435                         return;
2436                 case '\033': /* ESC */
2437                         csireset();
2438                         term.esc = ESC_START;
2439                         return;
2440                 case '\016': /* SO */
2441                         term.charset = 0;
2442                         tselcs();
2443                         return;
2444                 case '\017': /* SI */
2445                         term.charset = 1;
2446                         tselcs();
2447                         return;
2448                 case '\032': /* SUB */
2449                 case '\030': /* CAN */
2450                         csireset();
2451                         return;
2452                 case '\005': /* ENQ (IGNORED) */
2453                 case '\000': /* NUL (IGNORED) */
2454                 case '\021': /* XON (IGNORED) */
2455                 case '\023': /* XOFF (IGNORED) */
2456                 case 0177:   /* DEL (IGNORED) */
2457                         return;
2458                 }
2459         } else if(term.esc & ESC_START) {
2460                 if(term.esc & ESC_CSI) {
2461                         csiescseq.buf[csiescseq.len++] = ascii;
2462                         if(BETWEEN(ascii, 0x40, 0x7E)
2463                                         || csiescseq.len >= \
2464                                         sizeof(csiescseq.buf)-1) {
2465                                 term.esc = 0;
2466                                 csiparse();
2467                                 csihandle();
2468                         }
2469                 } else if(term.esc & ESC_STR_END) {
2470                         term.esc = 0;
2471                         if(ascii == '\\')
2472                                 strhandle();
2473                 } else if(term.esc & ESC_ALTCHARSET) {
2474                         tdeftran(ascii);
2475                         tselcs();
2476                         term.esc = 0;
2477                 } else if(term.esc & ESC_TEST) {
2478                         if(ascii == '8') { /* DEC screen alignment test. */
2479                                 char E[UTF_SIZ] = "E";
2480                                 int x, y;
2481
2482                                 for(x = 0; x < term.col; ++x) {
2483                                         for(y = 0; y < term.row; ++y)
2484                                                 tsetchar(E, &term.c.attr, x, y);
2485                                 }
2486                         }
2487                         term.esc = 0;
2488                 } else {
2489                         switch(ascii) {
2490                         case '[':
2491                                 term.esc |= ESC_CSI;
2492                                 break;
2493                         case '#':
2494                                 term.esc |= ESC_TEST;
2495                                 break;
2496                         case 'P': /* DCS -- Device Control String */
2497                         case '_': /* APC -- Application Program Command */
2498                         case '^': /* PM -- Privacy Message */
2499                         case ']': /* OSC -- Operating System Command */
2500                         case 'k': /* old title set compatibility */
2501                                 strreset();
2502                                 strescseq.type = ascii;
2503                                 term.esc |= ESC_STR;
2504                                 break;
2505                         case '(': /* set primary charset G0 */
2506                         case ')': /* set secondary charset G1 */
2507                         case '*': /* set tertiary charset G2 */
2508                         case '+': /* set quaternary charset G3 */
2509                                 term.icharset = ascii - '(';
2510                                 term.esc |= ESC_ALTCHARSET;
2511                                 break;
2512                         case 'D': /* IND -- Linefeed */
2513                                 if(term.c.y == term.bot) {
2514                                         tscrollup(term.top, 1);
2515                                 } else {
2516                                         tmoveto(term.c.x, term.c.y+1);
2517                                 }
2518                                 term.esc = 0;
2519                                 break;
2520                         case 'E': /* NEL -- Next line */
2521                                 tnewline(1); /* always go to first col */
2522                                 term.esc = 0;
2523                                 break;
2524                         case 'H': /* HTS -- Horizontal tab stop */
2525                                 term.tabs[term.c.x] = 1;
2526                                 term.esc = 0;
2527                                 break;
2528                         case 'M': /* RI -- Reverse index */
2529                                 if(term.c.y == term.top) {
2530                                         tscrolldown(term.top, 1);
2531                                 } else {
2532                                         tmoveto(term.c.x, term.c.y-1);
2533                                 }
2534                                 term.esc = 0;
2535                                 break;
2536                         case 'Z': /* DECID -- Identify Terminal */
2537                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2538                                 term.esc = 0;
2539                                 break;
2540                         case 'c': /* RIS -- Reset to inital state */
2541                                 treset();
2542                                 term.esc = 0;
2543                                 xresettitle();
2544                                 xloadcols();
2545                                 break;
2546                         case '=': /* DECPAM -- Application keypad */
2547                                 term.mode |= MODE_APPKEYPAD;
2548                                 term.esc = 0;
2549                                 break;
2550                         case '>': /* DECPNM -- Normal keypad */
2551                                 term.mode &= ~MODE_APPKEYPAD;
2552                                 term.esc = 0;
2553                                 break;
2554                         case '7': /* DECSC -- Save Cursor */
2555                                 tcursor(CURSOR_SAVE);
2556                                 term.esc = 0;
2557                                 break;
2558                         case '8': /* DECRC -- Restore Cursor */
2559                                 tcursor(CURSOR_LOAD);
2560                                 term.esc = 0;
2561                                 break;
2562                         case '\\': /* ST -- Stop */
2563                                 term.esc = 0;
2564                                 break;
2565                         default:
2566                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2567                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2568                                 term.esc = 0;
2569                         }
2570                 }
2571                 /*
2572                  * All characters which form part of a sequence are not
2573                  * printed
2574                  */
2575                 return;
2576         }
2577         /*
2578          * Display control codes only if we are in graphic mode
2579          */
2580         if(control && !(term.c.attr.mode & ATTR_GFX))
2581                 return;
2582         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2583                 selclear(NULL);
2584         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2585                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2586                 tnewline(1);
2587         }
2588
2589         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2590                 memmove(&term.line[term.c.y][term.c.x+1],
2591                         &term.line[term.c.y][term.c.x],
2592                         (term.col - term.c.x - 1) * sizeof(Glyph));
2593         }
2594
2595         if(term.c.x+width > term.col)
2596                 tnewline(1);
2597
2598         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2599
2600         if(width == 2) {
2601                 term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
2602                 if(term.c.x+1 < term.col) {
2603                         term.line[term.c.y][term.c.x+1].c[0] = '\0';
2604                         term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
2605                 }
2606         }
2607         if(term.c.x+width < term.col) {
2608                 tmoveto(term.c.x+width, term.c.y);
2609         } else {
2610                 term.c.state |= CURSOR_WRAPNEXT;
2611         }
2612 }
2613
2614 int
2615 tresize(int col, int row) {
2616         int i;
2617         int minrow = MIN(row, term.row);
2618         int mincol = MIN(col, term.col);
2619         int slide = term.c.y - row + 1;
2620         bool *bp;
2621         Line *orig;
2622
2623         if(col < 1 || row < 1)
2624                 return 0;
2625
2626         /* free unneeded rows */
2627         i = 0;
2628         if(slide > 0) {
2629                 /*
2630                  * slide screen to keep cursor where we expect it -
2631                  * tscrollup would work here, but we can optimize to
2632                  * memmove because we're freeing the earlier lines
2633                  */
2634                 for(/* i = 0 */; i < slide; i++) {
2635                         free(term.line[i]);
2636                         free(term.alt[i]);
2637                 }
2638                 memmove(term.line, term.line + slide, row * sizeof(Line));
2639                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2640         }
2641         for(i += row; i < term.row; i++) {
2642                 free(term.line[i]);
2643                 free(term.alt[i]);
2644         }
2645
2646         /* resize to new height */
2647         term.line = xrealloc(term.line, row * sizeof(Line));
2648         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2649         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2650         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2651
2652         /* resize each row to new width, zero-pad if needed */
2653         for(i = 0; i < minrow; i++) {
2654                 term.dirty[i] = 1;
2655                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2656                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2657         }
2658
2659         /* allocate any new rows */
2660         for(/* i == minrow */; i < row; i++) {
2661                 term.dirty[i] = 1;
2662                 term.line[i] = xmalloc(col * sizeof(Glyph));
2663                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2664         }
2665         if(col > term.col) {
2666                 bp = term.tabs + term.col;
2667
2668                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2669                 while(--bp > term.tabs && !*bp)
2670                         /* nothing */ ;
2671                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2672                         *bp = 1;
2673         }
2674         /* update terminal size */
2675         term.col = col;
2676         term.row = row;
2677         /* reset scrolling region */
2678         tsetscroll(0, row-1);
2679         /* make use of the LIMIT in tmoveto */
2680         tmoveto(term.c.x, term.c.y);
2681         /* Clearing both screens */
2682         orig = term.line;
2683         do {
2684                 if(mincol < col && 0 < minrow) {
2685                         tclearregion(mincol, 0, col - 1, minrow - 1);
2686                 }
2687                 if(0 < col && minrow < row) {
2688                         tclearregion(0, minrow, col - 1, row - 1);
2689                 }
2690                 tswapscreen();
2691         } while(orig != term.line);
2692
2693         return (slide > 0);
2694 }
2695
2696 void
2697 xresize(int col, int row) {
2698         xw.tw = MAX(1, col * xw.cw);
2699         xw.th = MAX(1, row * xw.ch);
2700
2701         XFreePixmap(xw.dpy, xw.buf);
2702         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2703                         DefaultDepth(xw.dpy, xw.scr));
2704         XftDrawChange(xw.draw, xw.buf);
2705         xclear(0, 0, xw.w, xw.h);
2706 }
2707
2708 static inline ushort
2709 sixd_to_16bit(int x) {
2710         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2711 }
2712
2713 void
2714 xloadcols(void) {
2715         int i, r, g, b;
2716         XRenderColor color = { .alpha = 0xffff };
2717         static bool loaded;
2718         Colour *cp;
2719
2720         if(loaded) {
2721                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2722                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2723         }
2724
2725         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2726         for(i = 0; i < LEN(colorname); i++) {
2727                 if(!colorname[i])
2728                         continue;
2729                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2730                         die("Could not allocate color '%s'\n", colorname[i]);
2731                 }
2732         }
2733
2734         /* load colors [16-255] ; same colors as xterm */
2735         for(i = 16, r = 0; r < 6; r++) {
2736                 for(g = 0; g < 6; g++) {
2737                         for(b = 0; b < 6; b++) {
2738                                 color.red = sixd_to_16bit(r);
2739                                 color.green = sixd_to_16bit(g);
2740                                 color.blue = sixd_to_16bit(b);
2741                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2742                                         die("Could not allocate color %d\n", i);
2743                                 }
2744                                 i++;
2745                         }
2746                 }
2747         }
2748
2749         for(r = 0; r < 24; r++, i++) {
2750                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2751                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2752                                         &dc.col[i])) {
2753                         die("Could not allocate color %d\n", i);
2754                 }
2755         }
2756         loaded = true;
2757 }
2758
2759 int
2760 xsetcolorname(int x, const char *name) {
2761         XRenderColor color = { .alpha = 0xffff };
2762         Colour colour;
2763         if (x < 0 || x > LEN(colorname))
2764                 return -1;
2765         if(!name) {
2766                 if(16 <= x && x < 16 + 216) {
2767                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2768                         color.red = sixd_to_16bit(r);
2769                         color.green = sixd_to_16bit(g);
2770                         color.blue = sixd_to_16bit(b);
2771                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2772                                 return 0; /* something went wrong */
2773                         dc.col[x] = colour;
2774                         return 1;
2775                 } else if (16 + 216 <= x && x < 256) {
2776                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2777                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2778                                 return 0; /* something went wrong */
2779                         dc.col[x] = colour;
2780                         return 1;
2781                 } else {
2782                         name = colorname[x];
2783                 }
2784         }
2785         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2786                 return 0;
2787         dc.col[x] = colour;
2788         return 1;
2789 }
2790
2791 void
2792 xtermclear(int col1, int row1, int col2, int row2) {
2793         XftDrawRect(xw.draw,
2794                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2795                         borderpx + col1 * xw.cw,
2796                         borderpx + row1 * xw.ch,
2797                         (col2-col1+1) * xw.cw,
2798                         (row2-row1+1) * xw.ch);
2799 }
2800
2801 /*
2802  * Absolute coordinates.
2803  */
2804 void
2805 xclear(int x1, int y1, int x2, int y2) {
2806         XftDrawRect(xw.draw,
2807                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2808                         x1, y1, x2-x1, y2-y1);
2809 }
2810
2811 void
2812 xhints(void) {
2813         XClassHint class = {opt_class ? opt_class : termname, termname};
2814         XWMHints wm = {.flags = InputHint, .input = 1};
2815         XSizeHints *sizeh = NULL;
2816
2817         sizeh = XAllocSizeHints();
2818         if(xw.isfixed == False) {
2819                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2820                 sizeh->height = xw.h;
2821                 sizeh->width = xw.w;
2822                 sizeh->height_inc = xw.ch;
2823                 sizeh->width_inc = xw.cw;
2824                 sizeh->base_height = 2 * borderpx;
2825                 sizeh->base_width = 2 * borderpx;
2826         } else {
2827                 sizeh->flags = PMaxSize | PMinSize;
2828                 sizeh->min_width = sizeh->max_width = xw.fw;
2829                 sizeh->min_height = sizeh->max_height = xw.fh;
2830         }
2831
2832         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2833                         &class);
2834         XFree(sizeh);
2835 }
2836
2837 int
2838 xloadfont(Font *f, FcPattern *pattern) {
2839         FcPattern *match;
2840         FcResult result;
2841
2842         match = FcFontMatch(NULL, pattern, &result);
2843         if(!match)
2844                 return 1;
2845
2846         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2847                 FcPatternDestroy(match);
2848                 return 1;
2849         }
2850
2851         f->set = NULL;
2852         f->pattern = FcPatternDuplicate(pattern);
2853
2854         f->ascent = f->match->ascent;
2855         f->descent = f->match->descent;
2856         f->lbearing = 0;
2857         f->rbearing = f->match->max_advance_width;
2858
2859         f->height = f->ascent + f->descent;
2860         f->width = f->lbearing + f->rbearing;
2861
2862         return 0;
2863 }
2864
2865 void
2866 xloadfonts(char *fontstr, double fontsize) {
2867         FcPattern *pattern;
2868         FcResult r_sz, r_psz;
2869         double fontval;
2870
2871         if(fontstr[0] == '-') {
2872                 pattern = XftXlfdParse(fontstr, False, False);
2873         } else {
2874                 pattern = FcNameParse((FcChar8 *)fontstr);
2875         }
2876
2877         if(!pattern)
2878                 die("st: can't open font %s\n", fontstr);
2879
2880         if(fontsize > 0) {
2881                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2882                 FcPatternDel(pattern, FC_SIZE);
2883                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2884                 usedfontsize = fontsize;
2885         } else {
2886                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2887                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2888                 if(r_psz == FcResultMatch) {
2889                         usedfontsize = fontval;
2890                 } else if(r_sz == FcResultMatch) {
2891                         usedfontsize = -1;
2892                 } else {
2893                         /*
2894                          * Default font size is 12, if none given. This is to
2895                          * have a known usedfontsize value.
2896                          */
2897                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2898                         usedfontsize = 12;
2899                 }
2900         }
2901
2902         FcConfigSubstitute(0, pattern, FcMatchPattern);
2903         FcDefaultSubstitute(pattern);
2904
2905         if(xloadfont(&dc.font, pattern))
2906                 die("st: can't open font %s\n", fontstr);
2907
2908         if(usedfontsize < 0) {
2909                 FcPatternGetDouble(dc.font.match->pattern,
2910                                    FC_PIXEL_SIZE, 0, &fontval);
2911                 usedfontsize = fontval;
2912         }
2913
2914         /* Setting character width and height. */
2915         xw.cw = CEIL(dc.font.width * cwscale);
2916         xw.ch = CEIL(dc.font.height * chscale);
2917
2918         FcPatternDel(pattern, FC_SLANT);
2919         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2920         if(xloadfont(&dc.ifont, pattern))
2921                 die("st: can't open font %s\n", fontstr);
2922
2923         FcPatternDel(pattern, FC_WEIGHT);
2924         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2925         if(xloadfont(&dc.ibfont, pattern))
2926                 die("st: can't open font %s\n", fontstr);
2927
2928         FcPatternDel(pattern, FC_SLANT);
2929         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2930         if(xloadfont(&dc.bfont, pattern))
2931                 die("st: can't open font %s\n", fontstr);
2932
2933         FcPatternDestroy(pattern);
2934 }
2935
2936 int
2937 xloadfontset(Font *f) {
2938         FcResult result;
2939
2940         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2941                 return 1;
2942         return 0;
2943 }
2944
2945 void
2946 xunloadfont(Font *f) {
2947         XftFontClose(xw.dpy, f->match);
2948         FcPatternDestroy(f->pattern);
2949         if(f->set)
2950                 FcFontSetDestroy(f->set);
2951 }
2952
2953 void
2954 xunloadfonts(void) {
2955         int i;
2956
2957         /* Free the loaded fonts in the font cache.  */
2958         for(i = 0; i < frclen; i++) {
2959                 XftFontClose(xw.dpy, frc[i].font);
2960         }
2961         frclen = 0;
2962
2963         xunloadfont(&dc.font);
2964         xunloadfont(&dc.bfont);
2965         xunloadfont(&dc.ifont);
2966         xunloadfont(&dc.ibfont);
2967 }
2968
2969 void
2970 xzoom(const Arg *arg) {
2971         xunloadfonts();
2972         xloadfonts(usedfont, usedfontsize + arg->i);
2973         cresize(0, 0);
2974         redraw(0);
2975 }
2976
2977 void
2978 xinit(void) {
2979         XGCValues gcvalues;
2980         Cursor cursor;
2981         Window parent;
2982         int sw, sh;
2983         pid_t thispid = getpid();
2984
2985         if(!(xw.dpy = XOpenDisplay(NULL)))
2986                 die("Can't open display\n");
2987         xw.scr = XDefaultScreen(xw.dpy);
2988         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2989
2990         /* font */
2991         if(!FcInit())
2992                 die("Could not init fontconfig.\n");
2993
2994         usedfont = (opt_font == NULL)? font : opt_font;
2995         xloadfonts(usedfont, 0);
2996
2997         /* colors */
2998         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2999         xloadcols();
3000
3001         /* adjust fixed window geometry */
3002         if(xw.isfixed) {
3003                 sw = DisplayWidth(xw.dpy, xw.scr);
3004                 sh = DisplayHeight(xw.dpy, xw.scr);
3005                 if(xw.fx < 0)
3006                         xw.fx = sw + xw.fx - xw.fw - 1;
3007                 if(xw.fy < 0)
3008                         xw.fy = sh + xw.fy - xw.fh - 1;
3009
3010                 xw.h = xw.fh;
3011                 xw.w = xw.fw;
3012         } else {
3013                 /* window - default size */
3014                 xw.h = 2 * borderpx + term.row * xw.ch;
3015                 xw.w = 2 * borderpx + term.col * xw.cw;
3016                 xw.fx = 0;
3017                 xw.fy = 0;
3018         }
3019
3020         /* Events */
3021         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3022         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3023         xw.attrs.bit_gravity = NorthWestGravity;
3024         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3025                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3026                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3027         xw.attrs.colormap = xw.cmap;
3028
3029         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3030                         XRootWindow(xw.dpy, xw.scr);
3031         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
3032                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3033                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3034                         | CWEventMask | CWColormap, &xw.attrs);
3035
3036         memset(&gcvalues, 0, sizeof(gcvalues));
3037         gcvalues.graphics_exposures = False;
3038         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3039                         &gcvalues);
3040         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3041                         DefaultDepth(xw.dpy, xw.scr));
3042         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3043         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3044
3045         /* Xft rendering context */
3046         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3047
3048         /* input methods */
3049         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3050                 XSetLocaleModifiers("@im=local");
3051                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3052                         XSetLocaleModifiers("@im=");
3053                         if((xw.xim = XOpenIM(xw.dpy,
3054                                         NULL, NULL, NULL)) == NULL) {
3055                                 die("XOpenIM failed. Could not open input"
3056                                         " device.\n");
3057                         }
3058                 }
3059         }
3060         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3061                                            | XIMStatusNothing, XNClientWindow, xw.win,
3062                                            XNFocusWindow, xw.win, NULL);
3063         if(xw.xic == NULL)
3064                 die("XCreateIC failed. Could not obtain input method.\n");
3065
3066         /* white cursor, black outline */
3067         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3068         XDefineCursor(xw.dpy, xw.win, cursor);
3069         XRecolorCursor(xw.dpy, cursor,
3070                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3071                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3072
3073         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3074         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3075         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3076         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3077
3078         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3079         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3080                         PropModeReplace, (unsigned char *)&thispid, 1);
3081
3082         xresettitle();
3083         XMapWindow(xw.dpy, xw.win);
3084         xhints();
3085         XSync(xw.dpy, False);
3086 }
3087
3088 void
3089 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3090         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3091             width = charlen * xw.cw, xp, i;
3092         int frcflags;
3093         int u8fl, u8fblen, u8cblen, doesexist;
3094         char *u8c, *u8fs;
3095         long unicodep;
3096         Font *font = &dc.font;
3097         FcResult fcres;
3098         FcPattern *fcpattern, *fontpattern;
3099         FcFontSet *fcsets[] = { NULL };
3100         FcCharSet *fccharset;
3101         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3102         XRenderColor colfg, colbg;
3103         XRectangle r;
3104         int oneatatime;
3105
3106         frcflags = FRC_NORMAL;
3107
3108         if(base.mode & ATTR_ITALIC) {
3109                 if(base.fg == defaultfg)
3110                         base.fg = defaultitalic;
3111                 font = &dc.ifont;
3112                 frcflags = FRC_ITALIC;
3113         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3114                 if(base.fg == defaultfg)
3115                         base.fg = defaultitalic;
3116                 font = &dc.ibfont;
3117                 frcflags = FRC_ITALICBOLD;
3118         } else if(base.mode & ATTR_UNDERLINE) {
3119                 if(base.fg == defaultfg)
3120                         base.fg = defaultunderline;
3121         }
3122
3123         if(IS_TRUECOL(base.fg)) {
3124                 colfg.alpha = 0xffff;
3125                 colfg.red = TRUERED(base.fg);
3126                 colfg.green = TRUEGREEN(base.fg);
3127                 colfg.blue = TRUEBLUE(base.fg);
3128                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3129                 fg = &truefg;
3130         } else {
3131                 fg = &dc.col[base.fg];
3132         }
3133
3134         if(IS_TRUECOL(base.bg)) {
3135                 colbg.alpha = 0xffff;
3136                 colbg.green = TRUEGREEN(base.bg);
3137                 colbg.red = TRUERED(base.bg);
3138                 colbg.blue = TRUEBLUE(base.bg);
3139                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3140                 bg = &truebg;
3141         } else {
3142                 bg = &dc.col[base.bg];
3143         }
3144
3145         if(base.mode & ATTR_BOLD) {
3146                 if(BETWEEN(base.fg, 0, 7)) {
3147                         /* basic system colors */
3148                         fg = &dc.col[base.fg + 8];
3149                 } else if(BETWEEN(base.fg, 16, 195)) {
3150                         /* 256 colors */
3151                         fg = &dc.col[base.fg + 36];
3152                 } else if(BETWEEN(base.fg, 232, 251)) {
3153                         /* greyscale */
3154                         fg = &dc.col[base.fg + 4];
3155                 }
3156                 /*
3157                  * Those ranges will not be brightened:
3158                  *    8 - 15 – bright system colors
3159                  *    196 - 231 – highest 256 color cube
3160                  *    252 - 255 – brightest colors in greyscale
3161                  */
3162                 font = &dc.bfont;
3163                 frcflags = FRC_BOLD;
3164         }
3165
3166         if(IS_SET(MODE_REVERSE)) {
3167                 if(fg == &dc.col[defaultfg]) {
3168                         fg = &dc.col[defaultbg];
3169                 } else {
3170                         colfg.red = ~fg->color.red;
3171                         colfg.green = ~fg->color.green;
3172                         colfg.blue = ~fg->color.blue;
3173                         colfg.alpha = fg->color.alpha;
3174                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3175                                         &revfg);
3176                         fg = &revfg;
3177                 }
3178
3179                 if(bg == &dc.col[defaultbg]) {
3180                         bg = &dc.col[defaultfg];
3181                 } else {
3182                         colbg.red = ~bg->color.red;
3183                         colbg.green = ~bg->color.green;
3184                         colbg.blue = ~bg->color.blue;
3185                         colbg.alpha = bg->color.alpha;
3186                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3187                                         &revbg);
3188                         bg = &revbg;
3189                 }
3190         }
3191
3192         if(base.mode & ATTR_REVERSE) {
3193                 temp = fg;
3194                 fg = bg;
3195                 bg = temp;
3196         }
3197
3198         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3199                 fg = bg;
3200
3201         /* Intelligent cleaning up of the borders. */
3202         if(x == 0) {
3203                 xclear(0, (y == 0)? 0 : winy, borderpx,
3204                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3205         }
3206         if(x + charlen >= term.col) {
3207                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3208                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3209         }
3210         if(y == 0)
3211                 xclear(winx, 0, winx + width, borderpx);
3212         if(y == term.row-1)
3213                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3214
3215         /* Clean up the region we want to draw to. */
3216         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3217
3218         /* Set the clip region because Xft is sometimes dirty. */
3219         r.x = 0;
3220         r.y = 0;
3221         r.height = xw.ch;
3222         r.width = width;
3223         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3224
3225         for(xp = winx; bytelen > 0;) {
3226                 /*
3227                  * Search for the range in the to be printed string of glyphs
3228                  * that are in the main font. Then print that range. If
3229                  * some glyph is found that is not in the font, do the
3230                  * fallback dance.
3231                  */
3232                 u8fs = s;
3233                 u8fblen = 0;
3234                 u8fl = 0;
3235                 oneatatime = font->width != xw.cw;
3236                 for(;;) {
3237                         u8c = s;
3238                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3239                         s += u8cblen;
3240                         bytelen -= u8cblen;
3241
3242                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3243                         if(oneatatime || !doesexist || bytelen <= 0) {
3244                                 if(oneatatime || bytelen <= 0) {
3245                                         if(doesexist) {
3246                                                 u8fl++;
3247                                                 u8fblen += u8cblen;
3248                                         }
3249                                 }
3250
3251                                 if(u8fl > 0) {
3252                                         XftDrawStringUtf8(xw.draw, fg,
3253                                                         font->match, xp,
3254                                                         winy + font->ascent,
3255                                                         (FcChar8 *)u8fs,
3256                                                         u8fblen);
3257                                         xp += xw.cw * u8fl;
3258
3259                                 }
3260                                 break;
3261                         }
3262
3263                         u8fl++;
3264                         u8fblen += u8cblen;
3265                 }
3266                 if(doesexist) {
3267                         if(oneatatime)
3268                                 continue;
3269                         break;
3270                 }
3271
3272                 /* Search the font cache. */
3273                 for(i = 0; i < frclen; i++) {
3274                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3275                                         && frc[i].flags == frcflags) {
3276                                 break;
3277                         }
3278                 }
3279
3280                 /* Nothing was found. */
3281                 if(i >= frclen) {
3282                         if(!font->set)
3283                                 xloadfontset(font);
3284                         fcsets[0] = font->set;
3285
3286                         /*
3287                          * Nothing was found in the cache. Now use
3288                          * some dozen of Fontconfig calls to get the
3289                          * font for one single character.
3290                          *
3291                          * Xft and fontconfig are design failures.
3292                          */
3293                         fcpattern = FcPatternDuplicate(font->pattern);
3294                         fccharset = FcCharSetCreate();
3295
3296                         FcCharSetAddChar(fccharset, unicodep);
3297                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3298                                         fccharset);
3299                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3300                                         FcTrue);
3301
3302                         FcConfigSubstitute(0, fcpattern,
3303                                         FcMatchPattern);
3304                         FcDefaultSubstitute(fcpattern);
3305
3306                         fontpattern = FcFontSetMatch(0, fcsets,
3307                                         FcTrue, fcpattern, &fcres);
3308
3309                         /*
3310                          * Overwrite or create the new cache entry.
3311                          */
3312                         if(frclen >= LEN(frc)) {
3313                                 frclen = LEN(frc) - 1;
3314                                 XftFontClose(xw.dpy, frc[frclen].font);
3315                         }
3316
3317                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3318                                         fontpattern);
3319                         frc[frclen].flags = frcflags;
3320
3321                         i = frclen;
3322                         frclen++;
3323
3324                         FcPatternDestroy(fcpattern);
3325                         FcCharSetDestroy(fccharset);
3326                 }
3327
3328                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3329                                 xp, winy + frc[i].font->ascent,
3330                                 (FcChar8 *)u8c, u8cblen);
3331
3332                 xp += xw.cw * wcwidth(unicodep);
3333         }
3334
3335         /*
3336          * This is how the loop above actually should be. Why does the
3337          * application have to care about font details?
3338          *
3339          * I have to repeat: Xft and Fontconfig are design failures.
3340          */
3341         /*
3342         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3343                         winy + font->ascent, (FcChar8 *)s, bytelen);
3344         */
3345
3346         if(base.mode & ATTR_UNDERLINE) {
3347                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3348                                 width, 1);
3349         }
3350
3351         /* Reset clip to none. */
3352         XftDrawSetClip(xw.draw, 0);
3353 }
3354
3355 void
3356 xdrawcursor(void) {
3357         static int oldx = 0, oldy = 0;
3358         int sl, width, curx;
3359         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3360
3361         LIMIT(oldx, 0, term.col-1);
3362         LIMIT(oldy, 0, term.row-1);
3363
3364         curx = term.c.x;
3365
3366         /* adjust position if in dummy */
3367         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3368                 oldx--;
3369         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3370                 curx--;
3371
3372         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3373
3374         /* remove the old cursor */
3375         sl = utf8len(term.line[oldy][oldx].c);
3376         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3377         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3378                         oldy, width, sl);
3379
3380         /* draw the new one */
3381         if(!(IS_SET(MODE_HIDE))) {
3382                 if(xw.state & WIN_FOCUSED) {
3383                         if(IS_SET(MODE_REVERSE)) {
3384                                 g.mode |= ATTR_REVERSE;
3385                                 g.fg = defaultcs;
3386                                 g.bg = defaultfg;
3387                         }
3388
3389                         sl = utf8len(g.c);
3390                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3391                                 ? 2 : 1;
3392                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3393                 } else {
3394                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3395                                         borderpx + curx * xw.cw,
3396                                         borderpx + term.c.y * xw.ch,
3397                                         xw.cw - 1, 1);
3398                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3399                                         borderpx + curx * xw.cw,
3400                                         borderpx + term.c.y * xw.ch,
3401                                         1, xw.ch - 1);
3402                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3403                                         borderpx + (curx + 1) * xw.cw - 1,
3404                                         borderpx + term.c.y * xw.ch,
3405                                         1, xw.ch - 1);
3406                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3407                                         borderpx + curx * xw.cw,
3408                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3409                                         xw.cw, 1);
3410                 }
3411                 oldx = curx, oldy = term.c.y;
3412         }
3413 }
3414
3415
3416 void
3417 xsettitle(char *p) {
3418         XTextProperty prop;
3419
3420         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3421                         &prop);
3422         XSetWMName(xw.dpy, xw.win, &prop);
3423         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3424         XFree(prop.value);
3425 }
3426
3427 void
3428 xresettitle(void) {
3429         xsettitle(opt_title ? opt_title : "st");
3430 }
3431
3432 void
3433 redraw(int timeout) {
3434         struct timespec tv = {0, timeout * 1000};
3435
3436         draw();
3437
3438         if(timeout > 0) {
3439                 nanosleep(&tv, NULL);
3440                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3441         }
3442 }
3443
3444 void
3445 draw(void) {
3446         drawregion(0, 0, term.col, term.row);
3447         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3448                         xw.h, 0, 0);
3449         XSetForeground(xw.dpy, dc.gc,
3450                         dc.col[IS_SET(MODE_REVERSE)?
3451                                 defaultfg : defaultbg].pixel);
3452 }
3453
3454 void
3455 drawregion(int x1, int y1, int x2, int y2) {
3456         int ic, ib, x, y, ox, sl;
3457         Glyph base, new;
3458         char buf[DRAW_BUF_SIZ];
3459         bool ena_sel = sel.ob.x != -1;
3460         long unicodep;
3461
3462         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3463                 ena_sel = 0;
3464
3465         if(!(xw.state & WIN_VISIBLE))
3466                 return;
3467
3468         for(y = y1; y < y2; y++) {
3469                 if(!term.dirty[y])
3470                         continue;
3471
3472                 xtermclear(0, y, term.col, y);
3473                 term.dirty[y] = 0;
3474                 base = term.line[y][0];
3475                 ic = ib = ox = 0;
3476                 for(x = x1; x < x2; x++) {
3477                         new = term.line[y][x];
3478                         if(new.mode == ATTR_WDUMMY)
3479                                 continue;
3480                         if(ena_sel && selected(x, y))
3481                                 new.mode ^= ATTR_REVERSE;
3482                         if(ib > 0 && (ATTRCMP(base, new)
3483                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3484                                 xdraws(buf, base, ox, y, ic, ib);
3485                                 ic = ib = 0;
3486                         }
3487                         if(ib == 0) {
3488                                 ox = x;
3489                                 base = new;
3490                         }
3491
3492                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3493                         memcpy(buf+ib, new.c, sl);
3494                         ib += sl;
3495                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3496                 }
3497                 if(ib > 0)
3498                         xdraws(buf, base, ox, y, ic, ib);
3499         }
3500         xdrawcursor();
3501 }
3502
3503 void
3504 expose(XEvent *ev) {
3505         XExposeEvent *e = &ev->xexpose;
3506
3507         if(xw.state & WIN_REDRAW) {
3508                 if(!e->count)
3509                         xw.state &= ~WIN_REDRAW;
3510         }
3511         redraw(0);
3512 }
3513
3514 void
3515 visibility(XEvent *ev) {
3516         XVisibilityEvent *e = &ev->xvisibility;
3517
3518         if(e->state == VisibilityFullyObscured) {
3519                 xw.state &= ~WIN_VISIBLE;
3520         } else if(!(xw.state & WIN_VISIBLE)) {
3521                 /* need a full redraw for next Expose, not just a buf copy */
3522                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3523         }
3524 }
3525
3526 void
3527 unmap(XEvent *ev) {
3528         xw.state &= ~WIN_VISIBLE;
3529 }
3530
3531 void
3532 xsetpointermotion(int set) {
3533         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3534         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3535 }
3536
3537 void
3538 xseturgency(int add) {
3539         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3540
3541         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3542         XSetWMHints(xw.dpy, xw.win, h);
3543         XFree(h);
3544 }
3545
3546 void
3547 focus(XEvent *ev) {
3548         XFocusChangeEvent *e = &ev->xfocus;
3549
3550         if(e->mode == NotifyGrab)
3551                 return;
3552
3553         if(ev->type == FocusIn) {
3554                 XSetICFocus(xw.xic);
3555                 xw.state |= WIN_FOCUSED;
3556                 xseturgency(0);
3557                 if(IS_SET(MODE_FOCUS))
3558                         ttywrite("\033[I", 3);
3559         } else {
3560                 XUnsetICFocus(xw.xic);
3561                 xw.state &= ~WIN_FOCUSED;
3562                 if(IS_SET(MODE_FOCUS))
3563                         ttywrite("\033[O", 3);
3564         }
3565 }
3566
3567 static inline bool
3568 match(uint mask, uint state) {
3569         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3570 }
3571
3572 void
3573 numlock(const Arg *dummy) {
3574         term.numlock ^= 1;
3575 }
3576
3577 char*
3578 kmap(KeySym k, uint state) {
3579         Key *kp;
3580         int i;
3581
3582         /* Check for mapped keys out of X11 function keys. */
3583         for(i = 0; i < LEN(mappedkeys); i++) {
3584                 if(mappedkeys[i] == k)
3585                         break;
3586         }
3587         if(i == LEN(mappedkeys)) {
3588                 if((k & 0xFFFF) < 0xFD00)
3589                         return NULL;
3590         }
3591
3592         for(kp = key; kp < key + LEN(key); kp++) {
3593                 if(kp->k != k)
3594                         continue;
3595
3596                 if(!match(kp->mask, state))
3597                         continue;
3598
3599                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3600                         continue;
3601                 if(term.numlock && kp->appkey == 2)
3602                         continue;
3603
3604                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3605                         continue;
3606
3607                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3608                         continue;
3609
3610                 return kp->s;
3611         }
3612
3613         return NULL;
3614 }
3615
3616 void
3617 kpress(XEvent *ev) {
3618         XKeyEvent *e = &ev->xkey;
3619         KeySym ksym;
3620         char buf[32], *customkey;
3621         int len;
3622         long c;
3623         Status status;
3624         Shortcut *bp;
3625
3626         if(IS_SET(MODE_KBDLOCK))
3627                 return;
3628
3629         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3630         /* 1. shortcuts */
3631         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3632                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3633                         bp->func(&(bp->arg));
3634                         return;
3635                 }
3636         }
3637
3638         /* 2. custom keys from config.h */
3639         if((customkey = kmap(ksym, e->state))) {
3640                 ttysend(customkey, strlen(customkey));
3641                 return;
3642         }
3643
3644         /* 3. composed string from input method */
3645         if(len == 0)
3646                 return;
3647         if(len == 1 && e->state & Mod1Mask) {
3648                 if(IS_SET(MODE_8BIT)) {
3649                         if(*buf < 0177) {
3650                                 c = *buf | 0x80;
3651                                 len = utf8encode(c, buf, UTF_SIZ);
3652                         }
3653                 } else {
3654                         buf[1] = buf[0];
3655                         buf[0] = '\033';
3656                         len = 2;
3657                 }
3658         }
3659         ttysend(buf, len);
3660 }
3661
3662
3663 void
3664 cmessage(XEvent *e) {
3665         /*
3666          * See xembed specs
3667          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3668          */
3669         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3670                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3671                         xw.state |= WIN_FOCUSED;
3672                         xseturgency(0);
3673                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3674                         xw.state &= ~WIN_FOCUSED;
3675                 }
3676         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3677                 /* Send SIGHUP to shell */
3678                 kill(pid, SIGHUP);
3679                 exit(EXIT_SUCCESS);
3680         }
3681 }
3682
3683 void
3684 cresize(int width, int height) {
3685         int col, row;
3686
3687         if(width != 0)
3688                 xw.w = width;
3689         if(height != 0)
3690                 xw.h = height;
3691
3692         col = (xw.w - 2 * borderpx) / xw.cw;
3693         row = (xw.h - 2 * borderpx) / xw.ch;
3694
3695         tresize(col, row);
3696         xresize(col, row);
3697         ttyresize();
3698 }
3699
3700 void
3701 resize(XEvent *e) {
3702         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3703                 return;
3704
3705         cresize(e->xconfigure.width, e->xconfigure.height);
3706 }
3707
3708 void
3709 run(void) {
3710         XEvent ev;
3711         int w = xw.w, h = xw.h;
3712         fd_set rfd;
3713         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3714         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3715
3716         /* Waiting for window mapping */
3717         while(1) {
3718                 XNextEvent(xw.dpy, &ev);
3719                 if(ev.type == ConfigureNotify) {
3720                         w = ev.xconfigure.width;
3721                         h = ev.xconfigure.height;
3722                 } else if(ev.type == MapNotify) {
3723                         break;
3724                 }
3725         }
3726
3727         ttynew();
3728         if(!xw.isfixed)
3729                 cresize(w, h);
3730         else
3731                 cresize(xw.fw, xw.fh);
3732
3733         gettimeofday(&last, NULL);
3734         lastblink = last;
3735
3736         for(xev = actionfps;;) {
3737                 long deltatime;
3738
3739                 FD_ZERO(&rfd);
3740                 FD_SET(cmdfd, &rfd);
3741                 FD_SET(xfd, &rfd);
3742
3743                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3744                         if(errno == EINTR)
3745                                 continue;
3746                         die("select failed: %s\n", strerror(errno));
3747                 }
3748                 if(FD_ISSET(cmdfd, &rfd)) {
3749                         ttyread();
3750                         if(blinktimeout) {
3751                                 blinkset = tattrset(ATTR_BLINK);
3752                                 if(!blinkset)
3753                                         MODBIT(term.mode, 0, MODE_BLINK);
3754                         }
3755                 }
3756
3757                 if(FD_ISSET(xfd, &rfd))
3758                         xev = actionfps;
3759
3760                 gettimeofday(&now, NULL);
3761                 drawtimeout.tv_sec = 0;
3762                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3763                 tv = &drawtimeout;
3764
3765                 dodraw = 0;
3766                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3767                         tsetdirtattr(ATTR_BLINK);
3768                         term.mode ^= MODE_BLINK;
3769                         lastblink = now;
3770                         dodraw = 1;
3771                 }
3772                 deltatime = TIMEDIFF(now, last);
3773                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3774                                 || deltatime < 0) {
3775                         dodraw = 1;
3776                         last = now;
3777                 }
3778
3779                 if(dodraw) {
3780                         while(XPending(xw.dpy)) {
3781                                 XNextEvent(xw.dpy, &ev);
3782                                 if(XFilterEvent(&ev, None))
3783                                         continue;
3784                                 if(handler[ev.type])
3785                                         (handler[ev.type])(&ev);
3786                         }
3787
3788                         draw();
3789                         XFlush(xw.dpy);
3790
3791                         if(xev && !FD_ISSET(xfd, &rfd))
3792                                 xev--;
3793                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3794                                 if(blinkset) {
3795                                         if(TIMEDIFF(now, lastblink) \
3796                                                         > blinktimeout) {
3797                                                 drawtimeout.tv_usec = 1;
3798                                         } else {
3799                                                 drawtimeout.tv_usec = (1000 * \
3800                                                         (blinktimeout - \
3801                                                         TIMEDIFF(now,
3802                                                                 lastblink)));
3803                                         }
3804                                 } else {
3805                                         tv = NULL;
3806                                 }
3807                         }
3808                 }
3809         }
3810 }
3811
3812 void
3813 usage(void) {
3814         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3815         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3816         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3817 }
3818
3819 int
3820 main(int argc, char *argv[]) {
3821         int bitm, xr, yr;
3822         uint wr, hr;
3823         char *titles;
3824
3825         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3826         xw.isfixed = False;
3827
3828         ARGBEGIN {
3829         case 'a':
3830                 allowaltscreen = false;
3831                 break;
3832         case 'c':
3833                 opt_class = EARGF(usage());
3834                 break;
3835         case 'e':
3836                 /* eat all remaining arguments */
3837                 if(argc > 1) {
3838                         opt_cmd = &argv[1];
3839                         if(argv[1] != NULL && opt_title == NULL) {
3840                                 titles = xstrdup(argv[1]);
3841                                 opt_title = basename(titles);
3842                         }
3843                 }
3844                 goto run;
3845         case 'f':
3846                 opt_font = EARGF(usage());
3847                 break;
3848         case 'g':
3849                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3850                 if(bitm & XValue)
3851                         xw.fx = xr;
3852                 if(bitm & YValue)
3853                         xw.fy = yr;
3854                 if(bitm & WidthValue)
3855                         xw.fw = (int)wr;
3856                 if(bitm & HeightValue)
3857                         xw.fh = (int)hr;
3858                 if(bitm & XNegative && xw.fx == 0)
3859                         xw.fx = -1;
3860                 if(bitm & YNegative && xw.fy == 0)
3861                         xw.fy = -1;
3862
3863                 if(xw.fh != 0 && xw.fw != 0)
3864                         xw.isfixed = True;
3865                 break;
3866         case 'o':
3867                 opt_io = EARGF(usage());
3868                 break;
3869         case 't':
3870                 opt_title = EARGF(usage());
3871                 break;
3872         case 'w':
3873                 opt_embed = EARGF(usage());
3874                 break;
3875         case 'v':
3876         default:
3877                 usage();
3878         } ARGEND;
3879
3880 run:
3881         setlocale(LC_CTYPE, "");
3882         XSetLocaleModifiers("");
3883         tnew(80, 24);
3884         xinit();
3885         selinit();
3886         run();
3887
3888         return 0;
3889 }
3890