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
  79 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  80 #define IS_TRUECOL(x)    (1 << 24 & (x))
  81 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  82 #define TRUEGREEN(x)     (((x) & 0xff00))
  83 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  84
  85
  86 #define VT102ID "\033[?6c"
  87
  88 enum glyph_attribute {
  89         ATTR_NULL      = 0,
  90         ATTR_REVERSE   = 1,
  91         ATTR_UNDERLINE = 2,
  92         ATTR_BOLD      = 4,
  93         ATTR_GFX       = 8,
  94         ATTR_ITALIC    = 16,
  95         ATTR_BLINK     = 32,
  96         ATTR_WRAP      = 64,
  97         ATTR_WIDE      = 128,
  98         ATTR_WDUMMY    = 256,
  99 };
 100
 101 enum cursor_movement {
 102         CURSOR_SAVE,
 103         CURSOR_LOAD
 104 };
 105
 106 enum cursor_state {
 107         CURSOR_DEFAULT  = 0,
 108         CURSOR_WRAPNEXT = 1,
 109         CURSOR_ORIGIN   = 2
 110 };
 111
 112 enum term_mode {
 113         MODE_WRAP        = 1,
 114         MODE_INSERT      = 2,
 115         MODE_APPKEYPAD   = 4,
 116         MODE_ALTSCREEN   = 8,
 117         MODE_CRLF        = 16,
 118         MODE_MOUSEBTN    = 32,
 119         MODE_MOUSEMOTION = 64,
 120         MODE_REVERSE     = 128,
 121         MODE_KBDLOCK     = 256,
 122         MODE_HIDE        = 512,
 123         MODE_ECHO        = 1024,
 124         MODE_APPCURSOR   = 2048,
 125         MODE_MOUSESGR    = 4096,
 126         MODE_8BIT        = 8192,
 127         MODE_BLINK       = 16384,
 128         MODE_FBLINK      = 32768,
 129         MODE_FOCUS       = 65536,
 130         MODE_MOUSEX10    = 131072,
 131         MODE_MOUSEMANY   = 262144,
 132         MODE_BRCKTPASTE  = 524288,
 133         MODE_PRINT       = 1048576,
 134         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 135                           |MODE_MOUSEMANY,
 136 };
 137
 138 enum charset {
 139         CS_GRAPHIC0,
 140         CS_GRAPHIC1,
 141         CS_UK,
 142         CS_USA,
 143         CS_MULTI,
 144         CS_GER,
 145         CS_FIN
 146 };
 147
 148 enum escape_state {
 149         ESC_START      = 1,
 150         ESC_CSI        = 2,
 151         ESC_STR        = 4,  /* DSC, OSC, PM, APC */
 152         ESC_ALTCHARSET = 8,
 153         ESC_STR_END    = 16, /* a final string was encountered */
 154         ESC_TEST       = 32, /* Enter in test mode */
 155 };
 156
 157 enum window_state {
 158         WIN_VISIBLE = 1,
 159         WIN_REDRAW  = 2,
 160         WIN_FOCUSED = 4
 161 };
 162
 163 enum selection_type {
 164         SEL_REGULAR = 1,
 165         SEL_RECTANGULAR = 2
 166 };
 167
 168 enum selection_snap {
 169         SNAP_WORD = 1,
 170         SNAP_LINE = 2
 171 };
 172
 173 typedef unsigned char uchar;
 174 typedef unsigned int uint;
 175 typedef unsigned long ulong;
 176 typedef unsigned short ushort;
 177
 178 typedef XftDraw *Draw;
 179 typedef XftColor Colour;
 180 typedef Colormap Colourmap;
 181
 182 typedef struct {
 183         char c[UTF_SIZ]; /* character code */
 184         ushort mode;      /* attribute flags */
 185         uint32_t fg;      /* foreground  */
 186         uint32_t bg;      /* background  */
 187 } Glyph;
 188
 189 typedef Glyph *Line;
 190
 191 typedef struct {
 192         Glyph attr; /* current char attributes */
 193         int x;
 194         int y;
 195         char state;
 196 } TCursor;
 197
 198 /* CSI Escape sequence structs */
 199 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 200 typedef struct {
 201         char buf[ESC_BUF_SIZ]; /* raw string */
 202         int len;               /* raw string length */
 203         char priv;
 204         int arg[ESC_ARG_SIZ];
 205         int narg;              /* nb of args */
 206         char mode;
 207 } CSIEscape;
 208
 209 /* STR Escape sequence structs */
 210 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 211 typedef struct {
 212         char type;             /* ESC type ... */
 213         char buf[STR_BUF_SIZ]; /* raw string */
 214         int len;               /* raw string length */
 215         char *args[STR_ARG_SIZ];
 216         int narg;              /* nb of args */
 217 } STREscape;
 218
 219 /* Internal representation of the screen */
 220 typedef struct {
 221         int row;      /* nb row */
 222         int col;      /* nb col */
 223         Line *line;   /* screen */
 224         Line *alt;    /* alternate screen */
 225         bool *dirty;  /* dirtyness of lines */
 226         TCursor c;    /* cursor */
 227         int top;      /* top    scroll limit */
 228         int bot;      /* bottom scroll limit */
 229         int mode;     /* terminal mode flags */
 230         int esc;      /* escape state flags */
 231         char trantbl[4]; /* charset table translation */
 232         int charset;  /* current charset */
 233         int icharset; /* selected charset for sequence */
 234         bool numlock; /* lock numbers in keyboard */
 235         bool *tabs;
 236 } Term;
 237
 238 /* Purely graphic info */
 239 typedef struct {
 240         Display *dpy;
 241         Colourmap cmap;
 242         Window win;
 243         Drawable buf;
 244         Atom xembed, wmdeletewin, netwmname, netwmpid;
 245         XIM xim;
 246         XIC xic;
 247         Draw draw;
 248         Visual *vis;
 249         XSetWindowAttributes attrs;
 250         int scr;
 251         bool isfixed; /* is fixed geometry? */
 252         int fx, fy, fw, fh; /* fixed geometry */
 253         int tw, th; /* tty width and height */
 254         int w, h; /* window width and height */
 255         int ch; /* char height */
 256         int cw; /* char width  */
 257         char state; /* focus, redraw, visible */
 258 } XWindow;
 259
 260 typedef struct {
 261         uint b;
 262         uint mask;
 263         char *s;
 264 } Mousekey;
 265
 266 typedef struct {
 267         KeySym k;
 268         uint mask;
 269         char *s;
 270         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 271         signed char appkey;    /* application keypad */
 272         signed char appcursor; /* application cursor */
 273         signed char crlf;      /* crlf mode          */
 274 } Key;
 275
 276 typedef struct {
 277         int mode;
 278         int type;
 279         int snap;
 280         /*
 281          * Selection variables:
 282          * nb – normalized coordinates of the beginning of the selection
 283          * ne – normalized coordinates of the end of the selection
 284          * ob – original coordinates of the beginning of the selection
 285          * oe – original coordinates of the end of the selection
 286          */
 287         struct {
 288                 int x, y;
 289         } nb, ne, ob, oe;
 290
 291         char *clip;
 292         Atom xtarget;
 293         bool alt;
 294         struct timeval tclick1;
 295         struct timeval tclick2;
 296 } Selection;
 297
 298 typedef union {
 299         int i;
 300         unsigned int ui;
 301         float f;
 302         const void *v;
 303 } Arg;
 304
 305 typedef struct {
 306         unsigned int mod;
 307         KeySym keysym;
 308         void (*func)(const Arg *);
 309         const Arg arg;
 310 } Shortcut;
 311
 312 /* function definitions used in config.h */
 313 static void clippaste(const Arg *);
 314 static void numlock(const Arg *);
 315 static void selpaste(const Arg *);
 316 static void xzoom(const Arg *);
 317 static void printsel(const Arg *);
 318 static void printscreen(const Arg *) ;
 319 static void toggleprinter(const Arg *);
 320
 321 /* Config.h for applying patches and the configuration. */
 322 #include "config.h"
 323
 324 /* Font structure */
 325 typedef struct {
 326         int height;
 327         int width;
 328         int ascent;
 329         int descent;
 330         short lbearing;
 331         short rbearing;
 332         XftFont *match;
 333         FcFontSet *set;
 334         FcPattern *pattern;
 335 } Font;
 336
 337 /* Drawing Context */
 338 typedef struct {
 339         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 340         Font font, bfont, ifont, ibfont;
 341         GC gc;
 342 } DC;
 343
 344 static void die(const char *, ...);
 345 static void draw(void);
 346 static void redraw(int);
 347 static void drawregion(int, int, int, int);
 348 static void execsh(void);
 349 static void sigchld(int);
 350 static void run(void);
 351
 352 static void csidump(void);
 353 static void csihandle(void);
 354 static void csiparse(void);
 355 static void csireset(void);
 356 static void strdump(void);
 357 static void strhandle(void);
 358 static void strparse(void);
 359 static void strreset(void);
 360
 361 static int tattrset(int);
 362 static void tprinter(char *s, size_t len);
 363 static void tdumpsel(void);
 364 static void tdumpline(int);
 365 static void tdump(void);
 366 static void tclearregion(int, int, int, int);
 367 static void tcursor(int);
 368 static void tdeletechar(int);
 369 static void tdeleteline(int);
 370 static void tinsertblank(int);
 371 static void tinsertblankline(int);
 372 static void tmoveto(int, int);
 373 static void tmoveato(int x, int y);
 374 static void tnew(int, int);
 375 static void tnewline(int);
 376 static void tputtab(bool);
 377 static void tputc(char *, int);
 378 static void treset(void);
 379 static int tresize(int, int);
 380 static void tscrollup(int, int);
 381 static void tscrolldown(int, int);
 382 static void tsetattr(int*, int);
 383 static void tsetchar(char *, Glyph *, int, int);
 384 static void tsetscroll(int, int);
 385 static void tswapscreen(void);
 386 static void tsetdirt(int, int);
 387 static void tsetdirtattr(int);
 388 static void tsetmode(bool, bool, int *, int);
 389 static void tfulldirt(void);
 390 static void techo(char *, int);
 391 static int32_t tdefcolor(int *, int *, int);
 392 static void tselcs(void);
 393 static void tdeftran(char);
 394 static inline bool match(uint, uint);
 395 static void ttynew(void);
 396 static void ttyread(void);
 397 static void ttyresize(void);
 398 static void ttysend(char *, size_t);
 399 static void ttywrite(const char *, size_t);
 400
 401 static void xdraws(char *, Glyph, int, int, int, int);
 402 static void xhints(void);
 403 static void xclear(int, int, int, int);
 404 static void xdrawcursor(void);
 405 static void xinit(void);
 406 static void xloadcols(void);
 407 static int xsetcolorname(int, const char *);
 408 static int xloadfont(Font *, FcPattern *);
 409 static void xloadfonts(char *, double);
 410 static int xloadfontset(Font *);
 411 static void xsettitle(char *);
 412 static void xresettitle(void);
 413 static void xsetpointermotion(int);
 414 static void xseturgency(int);
 415 static void xsetsel(char*);
 416 static void xtermclear(int, int, int, int);
 417 static void xunloadfont(Font *f);
 418 static void xunloadfonts(void);
 419 static void xresize(int, int);
 420
 421 static void expose(XEvent *);
 422 static void visibility(XEvent *);
 423 static void unmap(XEvent *);
 424 static char *kmap(KeySym, uint);
 425 static void kpress(XEvent *);
 426 static void cmessage(XEvent *);
 427 static void cresize(int, int);
 428 static void resize(XEvent *);
 429 static void focus(XEvent *);
 430 static void brelease(XEvent *);
 431 static void bpress(XEvent *);
 432 static void bmotion(XEvent *);
 433 static void selnotify(XEvent *);
 434 static void selclear(XEvent *);
 435 static void selrequest(XEvent *);
 436
 437 static void selinit(void);
 438 static void selsort(void);
 439 static inline bool selected(int, int);
 440 static char *getsel(void);
 441 static void selcopy(void);
 442 static void selscroll(int, int);
 443 static void selsnap(int, int *, int *, int);
 444
 445 static size_t utf8decode(char *, long *, size_t);
 446 static long utf8decodebyte(char, size_t *);
 447 static size_t utf8encode(long, char *, size_t);
 448 static char utf8encodebyte(long, size_t);
 449 static size_t utf8len(char *);
 450 static size_t utf8validate(long *, size_t);
 451
 452 static ssize_t xwrite(int, char *, size_t);
 453 static void *xmalloc(size_t);
 454 static void *xrealloc(void *, size_t);
 455 static char *xstrdup(char *s);
 456
 457 static void (*handler[LASTEvent])(XEvent *) = {
 458         [KeyPress] = kpress,
 459         [ClientMessage] = cmessage,
 460         [ConfigureNotify] = resize,
 461         [VisibilityNotify] = visibility,
 462         [UnmapNotify] = unmap,
 463         [Expose] = expose,
 464         [FocusIn] = focus,
 465         [FocusOut] = focus,
 466         [MotionNotify] = bmotion,
 467         [ButtonPress] = bpress,
 468         [ButtonRelease] = brelease,
 469         [SelectionClear] = selclear,
 470         [SelectionNotify] = selnotify,
 471         [SelectionRequest] = selrequest,
 472 };
 473
 474 /* Globals */
 475 static DC dc;
 476 static XWindow xw;
 477 static Term term;
 478 static CSIEscape csiescseq;
 479 static STREscape strescseq;
 480 static int cmdfd;
 481 static pid_t pid;
 482 static Selection sel;
 483 static int iofd = STDOUT_FILENO;
 484 static char **opt_cmd = NULL;
 485 static char *opt_io = NULL;
 486 static char *opt_title = NULL;
 487 static char *opt_embed = NULL;
 488 static char *opt_class = NULL;
 489 static char *opt_font = NULL;
 490 static int oldbutton = 3; /* button event on startup: 3 = release */
 491
 492 static char *usedfont = NULL;
 493 static double usedfontsize = 0;
 494
 495 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 496 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 497 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 498 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 499
 500 /* Font Ring Cache */
 501 enum {
 502         FRC_NORMAL,
 503         FRC_ITALIC,
 504         FRC_BOLD,
 505         FRC_ITALICBOLD
 506 };
 507
 508 typedef struct {
 509         XftFont *font;
 510         int flags;
 511 } Fontcache;
 512
 513 /* Fontcache is an array now. A new font will be appended to the array. */
 514 static Fontcache frc[16];
 515 static int frclen = 0;
 516
 517 ssize_t
 518 xwrite(int fd, char *s, size_t len) {
 519         size_t aux = len;
 520
 521         while(len > 0) {
 522                 ssize_t r = write(fd, s, len);
 523                 if(r < 0)
 524                         return r;
 525                 len -= r;
 526                 s += r;
 527         }
 528         return aux;
 529 }
 530
 531 void *
 532 xmalloc(size_t len) {
 533         void *p = malloc(len);
 534
 535         if(!p)
 536                 die("Out of memory\n");
 537
 538         return p;
 539 }
 540
 541 void *
 542 xrealloc(void *p, size_t len) {
 543         if((p = realloc(p, len)) == NULL)
 544                 die("Out of memory\n");
 545
 546         return p;
 547 }
 548
 549 char *
 550 xstrdup(char *s) {
 551         char *p = strdup(s);
 552
 553         if (!p)
 554                 die("Out of memory\n");
 555
 556         return p;
 557 }
 558
 559 size_t
 560 utf8decode(char *c, long *u, size_t clen) {
 561         size_t i, j, len, type;
 562         long udecoded;
 563
 564         *u = UTF_INVALID;
 565         if(!clen)
 566                 return 0;
 567         udecoded = utf8decodebyte(c[0], &len);
 568         if(!BETWEEN(len, 1, UTF_SIZ))
 569                 return 1;
 570         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 571                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 572                 if(type != 0)
 573                         return j;
 574         }
 575         if(j < len)
 576                 return 0;
 577         *u = udecoded;
 578         utf8validate(u, len);
 579         return len;
 580 }
 581
 582 long
 583 utf8decodebyte(char c, size_t *i) {
 584         for(*i = 0; *i < LEN(utfmask); ++(*i))
 585                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 586                         return (uchar)c & ~utfmask[*i];
 587         return 0;
 588 }
 589
 590 size_t
 591 utf8encode(long u, char *c, size_t clen) {
 592         size_t len, i;
 593
 594         len = utf8validate(&u, 0);
 595         if(clen < len)
 596                 return 0;
 597         for(i = len - 1; i != 0; --i) {
 598                 c[i] = utf8encodebyte(u, 0);
 599                 u >>= 6;
 600         }
 601         c[0] = utf8encodebyte(u, len);
 602         return len;
 603 }
 604
 605 char
 606 utf8encodebyte(long u, size_t i) {
 607         return utfbyte[i] | (u & ~utfmask[i]);
 608 }
 609
 610 size_t
 611 utf8len(char *c) {
 612         return utf8decode(c, &(long){0}, UTF_SIZ);
 613 }
 614
 615 size_t
 616 utf8validate(long *u, size_t i) {
 617         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 618                 *u = UTF_INVALID;
 619         for(i = 1; *u > utfmax[i]; ++i)
 620                 ;
 621         return i;
 622 }
 623
 624 static void
 625 selinit(void) {
 626         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 627         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 628         sel.mode = 0;
 629         sel.ob.x = -1;
 630         sel.clip = NULL;
 631         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 632         if(sel.xtarget == None)
 633                 sel.xtarget = XA_STRING;
 634 }
 635
 636 static int
 637 x2col(int x) {
 638         x -= borderpx;
 639         x /= xw.cw;
 640
 641         return LIMIT(x, 0, term.col-1);
 642 }
 643
 644 static int
 645 y2row(int y) {
 646         y -= borderpx;
 647         y /= xw.ch;
 648
 649         return LIMIT(y, 0, term.row-1);
 650 }
 651
 652 static void
 653 selsort(void) {
 654         if(sel.ob.y == sel.oe.y) {
 655                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 656                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 657         } else {
 658                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 659                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 660         }
 661         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 662         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 663 }
 664
 665 static inline bool
 666 selected(int x, int y) {
 667         if(sel.ne.y == y && sel.nb.y == y)
 668                 return BETWEEN(x, sel.nb.x, sel.ne.x);
 669
 670         if(sel.type == SEL_RECTANGULAR) {
 671                 return ((sel.nb.y <= y && y <= sel.ne.y)
 672                         && (sel.nb.x <= x && x <= sel.ne.x));
 673         }
 674
 675         return ((sel.nb.y < y && y < sel.ne.y)
 676                 || (y == sel.ne.y && x <= sel.ne.x))
 677                 || (y == sel.nb.y && x >= sel.nb.x
 678                         && (x <= sel.ne.x || sel.nb.y != sel.ne.y));
 679 }
 680
 681 void
 682 selsnap(int mode, int *x, int *y, int direction) {
 683         int i;
 684
 685         switch(mode) {
 686         case SNAP_WORD:
 687                 /*
 688                  * Snap around if the word wraps around at the end or
 689                  * beginning of a line.
 690                  */
 691                 for(;;) {
 692                         if(direction < 0 && *x <= 0) {
 693                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 694                                                 & ATTR_WRAP) {
 695                                         *y -= 1;
 696                                         *x = term.col-1;
 697                                 } else {
 698                                         break;
 699                                 }
 700                         }
 701                         if(direction > 0 && *x >= term.col-1) {
 702                                 if(*y < term.row-1 && term.line[*y][*x].mode
 703                                                 & ATTR_WRAP) {
 704                                         *y += 1;
 705                                         *x = 0;
 706                                 } else {
 707                                         break;
 708                                 }
 709                         }
 710
 711                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 712                                 *x += direction;
 713                                 continue;
 714                         }
 715
 716                         if(strchr(worddelimiters,
 717                                         term.line[*y][*x+direction].c[0])) {
 718                                 break;
 719                         }
 720
 721                         *x += direction;
 722                 }
 723                 break;
 724         case SNAP_LINE:
 725                 /*
 726                  * Snap around if the the previous line or the current one
 727                  * has set ATTR_WRAP at its end. Then the whole next or
 728                  * previous line will be selected.
 729                  */
 730                 *x = (direction < 0) ? 0 : term.col - 1;
 731                 if(direction < 0 && *y > 0) {
 732                         for(; *y > 0; *y += direction) {
 733                                 if(!(term.line[*y-1][term.col-1].mode
 734                                                 & ATTR_WRAP)) {
 735                                         break;
 736                                 }
 737                         }
 738                 } else if(direction > 0 && *y < term.row-1) {
 739                         for(; *y < term.row; *y += direction) {
 740                                 if(!(term.line[*y][term.col-1].mode
 741                                                 & ATTR_WRAP)) {
 742                                         break;
 743                                 }
 744                         }
 745                 }
 746                 break;
 747         default:
 748                 /*
 749                  * Select the whole line when the end of line is reached.
 750                  */
 751                 if(direction > 0) {
 752                         i = term.col;
 753                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 754                                 /* nothing */;
 755                         if(i > 0 && i < *x)
 756                                 *x = term.col - 1;
 757                 }
 758                 break;
 759         }
 760 }
 761
 762 void
 763 getbuttoninfo(XEvent *e) {
 764         int type;
 765         uint state = e->xbutton.state &~Button1Mask;
 766
 767         sel.alt = IS_SET(MODE_ALTSCREEN);
 768
 769         sel.oe.x = x2col(e->xbutton.x);
 770         sel.oe.y = y2row(e->xbutton.y);
 771
 772         if(sel.ob.y < sel.oe.y
 773                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 774                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 775                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 776         } else {
 777                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 778                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 779         }
 780         selsort();
 781
 782         sel.type = SEL_REGULAR;
 783         for(type = 1; type < LEN(selmasks); ++type) {
 784                 if(match(selmasks[type], state)) {
 785                         sel.type = type;
 786                         break;
 787                 }
 788         }
 789 }
 790
 791 void
 792 mousereport(XEvent *e) {
 793         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 794             button = e->xbutton.button, state = e->xbutton.state,
 795             len;
 796         char buf[40];
 797         static int ox, oy;
 798
 799         /* from urxvt */
 800         if(e->xbutton.type == MotionNotify) {
 801                 if(x == ox && y == oy)
 802                         return;
 803                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 804                         return;
 805                 /* MOUSE_MOTION: no reporting if no button is pressed */
 806                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 807                         return;
 808
 809                 button = oldbutton + 32;
 810                 ox = x;
 811                 oy = y;
 812         } else {
 813                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 814                         button = 3;
 815                 } else {
 816                         button -= Button1;
 817                         if(button >= 3)
 818                                 button += 64 - 3;
 819                 }
 820                 if(e->xbutton.type == ButtonPress) {
 821                         oldbutton = button;
 822                         ox = x;
 823                         oy = y;
 824                 } else if(e->xbutton.type == ButtonRelease) {
 825                         oldbutton = 3;
 826                         /* MODE_MOUSEX10: no button release reporting */
 827                         if(IS_SET(MODE_MOUSEX10))
 828                                 return;
 829                 }
 830         }
 831
 832         if(!IS_SET(MODE_MOUSEX10)) {
 833                 button += (state & ShiftMask   ? 4  : 0)
 834                         + (state & Mod4Mask    ? 8  : 0)
 835                         + (state & ControlMask ? 16 : 0);
 836         }
 837
 838         len = 0;
 839         if(IS_SET(MODE_MOUSESGR)) {
 840                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 841                                 button, x+1, y+1,
 842                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 843         } else if(x < 223 && y < 223) {
 844                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 845                                 32+button, 32+x+1, 32+y+1);
 846         } else {
 847                 return;
 848         }
 849
 850         ttywrite(buf, len);
 851 }
 852
 853 void
 854 bpress(XEvent *e) {
 855         struct timeval now;
 856         Mousekey *mk;
 857
 858         if(IS_SET(MODE_MOUSE)) {
 859                 mousereport(e);
 860                 return;
 861         }
 862
 863         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 864                 if(e->xbutton.button == mk->b
 865                                 && match(mk->mask, e->xbutton.state)) {
 866                         ttysend(mk->s, strlen(mk->s));
 867                         return;
 868                 }
 869         }
 870
 871         if(e->xbutton.button == Button1) {
 872                 gettimeofday(&now, NULL);
 873
 874                 /* Clear previous selection, logically and visually. */
 875                 selclear(NULL);
 876                 sel.mode = 1;
 877                 sel.type = SEL_REGULAR;
 878                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 879                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 880
 881                 /*
 882                  * If the user clicks below predefined timeouts specific
 883                  * snapping behaviour is exposed.
 884                  */
 885                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 886                         sel.snap = SNAP_LINE;
 887                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 888                         sel.snap = SNAP_WORD;
 889                 } else {
 890                         sel.snap = 0;
 891                 }
 892                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 893                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 894                 selsort();
 895
 896                 /*
 897                  * Draw selection, unless it's regular and we don't want to
 898                  * make clicks visible
 899                  */
 900                 if(sel.snap != 0) {
 901                         sel.mode++;
 902                         tsetdirt(sel.nb.y, sel.ne.y);
 903                 }
 904                 sel.tclick2 = sel.tclick1;
 905                 sel.tclick1 = now;
 906         }
 907 }
 908
 909 char *
 910 getsel(void) {
 911         char *str, *ptr;
 912         int x, y, bufsize, size, i, ex;
 913         Glyph *gp, *last;
 914
 915         if(sel.ob.x == -1) {
 916                 str = NULL;
 917         } else {
 918                 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 919                 ptr = str = xmalloc(bufsize);
 920
 921                 /* append every set & selected glyph to the selection */
 922                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 923                         gp = &term.line[y][0];
 924                         last = &gp[term.col-1];
 925
 926                         while(last >= gp && !(selected(last - gp, y) &&
 927                                               strcmp(last->c, " ") != 0)) {
 928                                 --last;
 929                         }
 930
 931                         for(x = 0; gp <= last; x++, ++gp) {
 932                                 if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 933                                         continue;
 934
 935                                 size = utf8len(gp->c);
 936                                 memcpy(ptr, gp->c, size);
 937                                 ptr += size;
 938                         }
 939
 940                         /*
 941                          * Copy and pasting of line endings is inconsistent
 942                          * in the inconsistent terminal and GUI world.
 943                          * The best solution seems like to produce '\n' when
 944                          * something is copied from st and convert '\n' to
 945                          * '\r', when something to be pasted is received by
 946                          * st.
 947                          * FIXME: Fix the computer world.
 948                          */
 949                         if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
 950                                 *ptr++ = '\n';
 951
 952                         /*
 953                          * If the last selected line expands in the selection
 954                          * after the visible text '\n' is appended.
 955                          */
 956                         if(y == sel.ne.y) {
 957                                 i = term.col;
 958                                 while(--i > 0 && term.line[y][i].c[0] == ' ')
 959                                         /* nothing */;
 960                                 ex = sel.ne.x;
 961                                 if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 962                                         ex = sel.nb.x;
 963                                 if(i < ex)
 964                                         *ptr++ = '\n';
 965                         }
 966                 }
 967                 *ptr = 0;
 968         }
 969         return str;
 970 }
 971
 972 void
 973 selcopy(void) {
 974         xsetsel(getsel());
 975 }
 976
 977 void
 978 selnotify(XEvent *e) {
 979         ulong nitems, ofs, rem;
 980         int format;
 981         uchar *data, *last, *repl;
 982         Atom type;
 983
 984         ofs = 0;
 985         do {
 986                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 987                                         False, AnyPropertyType, &type, &format,
 988                                         &nitems, &rem, &data)) {
 989                         fprintf(stderr, "Clipboard allocation failed\n");
 990                         return;
 991                 }
 992
 993                 /*
 994                  * As seen in selcopy:
 995                  * Line endings are inconsistent in the terminal and GUI world
 996                  * copy and pasting. When receiving some selection data,
 997                  * replace all '\n' with '\r'.
 998                  * FIXME: Fix the computer world.
 999                  */
1000                 repl = data;
1001                 last = data + nitems * format / 8;
1002                 while((repl = memchr(repl, '\n', last - repl))) {
1003                         *repl++ = '\r';
1004                 }
1005
1006                 if(IS_SET(MODE_BRCKTPASTE))
1007                         ttywrite("\033[200~", 6);
1008                 ttysend((char *)data, nitems * format / 8);
1009                 if(IS_SET(MODE_BRCKTPASTE))
1010                         ttywrite("\033[201~", 6);
1011                 XFree(data);
1012                 /* number of 32-bit chunks returned */
1013                 ofs += nitems * format / 32;
1014         } while(rem > 0);
1015 }
1016
1017 void
1018 selpaste(const Arg *dummy) {
1019         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1020                         xw.win, CurrentTime);
1021 }
1022
1023 void
1024 clippaste(const Arg *dummy) {
1025         Atom clipboard;
1026
1027         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1028         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1029                         xw.win, CurrentTime);
1030 }
1031
1032 void
1033 selclear(XEvent *e) {
1034         if(sel.ob.x == -1)
1035                 return;
1036         sel.ob.x = -1;
1037         tsetdirt(sel.nb.y, sel.ne.y);
1038 }
1039
1040 void
1041 selrequest(XEvent *e) {
1042         XSelectionRequestEvent *xsre;
1043         XSelectionEvent xev;
1044         Atom xa_targets, string;
1045
1046         xsre = (XSelectionRequestEvent *) e;
1047         xev.type = SelectionNotify;
1048         xev.requestor = xsre->requestor;
1049         xev.selection = xsre->selection;
1050         xev.target = xsre->target;
1051         xev.time = xsre->time;
1052         /* reject */
1053         xev.property = None;
1054
1055         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1056         if(xsre->target == xa_targets) {
1057                 /* respond with the supported type */
1058                 string = sel.xtarget;
1059                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1060                                 XA_ATOM, 32, PropModeReplace,
1061                                 (uchar *) &string, 1);
1062                 xev.property = xsre->property;
1063         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1064                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1065                                 xsre->target, 8, PropModeReplace,
1066                                 (uchar *) sel.clip, strlen(sel.clip));
1067                 xev.property = xsre->property;
1068         }
1069
1070         /* all done, send a notification to the listener */
1071         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1072                 fprintf(stderr, "Error sending SelectionNotify event\n");
1073 }
1074
1075 void
1076 xsetsel(char *str) {
1077         /* register the selection for both the clipboard and the primary */
1078         Atom clipboard;
1079
1080         free(sel.clip);
1081         sel.clip = str;
1082
1083         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1084
1085         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1086         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1087 }
1088
1089 void
1090 brelease(XEvent *e) {
1091         if(IS_SET(MODE_MOUSE)) {
1092                 mousereport(e);
1093                 return;
1094         }
1095
1096         if(e->xbutton.button == Button2) {
1097                 selpaste(NULL);
1098         } else if(e->xbutton.button == Button1) {
1099                 if(sel.mode < 2) {
1100                         selclear(NULL);
1101                 } else {
1102                         getbuttoninfo(e);
1103                         selcopy();
1104                 }
1105                 sel.mode = 0;
1106                 tsetdirt(sel.nb.y, sel.ne.y);
1107         }
1108 }
1109
1110 void
1111 bmotion(XEvent *e) {
1112         int oldey, oldex, oldsby, oldsey;
1113
1114         if(IS_SET(MODE_MOUSE)) {
1115                 mousereport(e);
1116                 return;
1117         }
1118
1119         if(!sel.mode)
1120                 return;
1121
1122         sel.mode++;
1123         oldey = sel.oe.y;
1124         oldex = sel.oe.x;
1125         oldsby = sel.nb.y;
1126         oldsey = sel.ne.y;
1127         getbuttoninfo(e);
1128
1129         if(oldey != sel.oe.y || oldex != sel.oe.x)
1130                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1131 }
1132
1133 void
1134 die(const char *errstr, ...) {
1135         va_list ap;
1136
1137         va_start(ap, errstr);
1138         vfprintf(stderr, errstr, ap);
1139         va_end(ap);
1140         exit(EXIT_FAILURE);
1141 }
1142
1143 void
1144 execsh(void) {
1145         char **args;
1146         char *envshell = getenv("SHELL");
1147         const struct passwd *pass = getpwuid(getuid());
1148         char buf[sizeof(long) * 8 + 1];
1149
1150         unsetenv("COLUMNS");
1151         unsetenv("LINES");
1152         unsetenv("TERMCAP");
1153
1154         if(pass) {
1155                 setenv("LOGNAME", pass->pw_name, 1);
1156                 setenv("USER", pass->pw_name, 1);
1157                 setenv("SHELL", pass->pw_shell, 0);
1158                 setenv("HOME", pass->pw_dir, 0);
1159         }
1160
1161         snprintf(buf, sizeof(buf), "%lu", xw.win);
1162         setenv("WINDOWID", buf, 1);
1163
1164         signal(SIGCHLD, SIG_DFL);
1165         signal(SIGHUP, SIG_DFL);
1166         signal(SIGINT, SIG_DFL);
1167         signal(SIGQUIT, SIG_DFL);
1168         signal(SIGTERM, SIG_DFL);
1169         signal(SIGALRM, SIG_DFL);
1170
1171         DEFAULT(envshell, shell);
1172         setenv("TERM", termname, 1);
1173         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1174         execvp(args[0], args);
1175         exit(EXIT_FAILURE);
1176 }
1177
1178 void
1179 sigchld(int a) {
1180         int stat = 0;
1181
1182         if(waitpid(pid, &stat, 0) < 0)
1183                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1184
1185         if(WIFEXITED(stat)) {
1186                 exit(WEXITSTATUS(stat));
1187         } else {
1188                 exit(EXIT_FAILURE);
1189         }
1190 }
1191
1192 void
1193 ttynew(void) {
1194         int m, s;
1195         struct winsize w = {term.row, term.col, 0, 0};
1196
1197         /* seems to work fine on linux, openbsd and freebsd */
1198         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1199                 die("openpty failed: %s\n", strerror(errno));
1200
1201         switch(pid = fork()) {
1202         case -1:
1203                 die("fork failed\n");
1204                 break;
1205         case 0:
1206                 setsid(); /* create a new process group */
1207                 dup2(s, STDIN_FILENO);
1208                 dup2(s, STDOUT_FILENO);
1209                 dup2(s, STDERR_FILENO);
1210                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1211                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1212                 close(s);
1213                 close(m);
1214                 execsh();
1215                 break;
1216         default:
1217                 close(s);
1218                 cmdfd = m;
1219                 signal(SIGCHLD, sigchld);
1220                 if(opt_io) {
1221                         term.mode |= MODE_PRINT;
1222                         iofd = (!strcmp(opt_io, "-")) ?
1223                                   STDOUT_FILENO :
1224                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1225                         if(iofd < 0) {
1226                                 fprintf(stderr, "Error opening %s:%s\n",
1227                                         opt_io, strerror(errno));
1228                         }
1229                 }
1230         }
1231 }
1232
1233 void
1234 dump(char c) {
1235         static int col;
1236
1237         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1238         if(++col % 10 == 0)
1239                 fprintf(stderr, "\n");
1240 }
1241
1242 void
1243 ttyread(void) {
1244         static char buf[BUFSIZ];
1245         static int buflen = 0;
1246         char *ptr;
1247         char s[UTF_SIZ];
1248         int charsize; /* size of utf8 char in bytes */
1249         long unicodep;
1250         int ret;
1251
1252         /* append read bytes to unprocessed bytes */
1253         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1254                 die("Couldn't read from shell: %s\n", strerror(errno));
1255
1256         /* process every complete utf8 char */
1257         buflen += ret;
1258         ptr = buf;
1259         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1260                 utf8encode(unicodep, s, UTF_SIZ);
1261                 tputc(s, charsize);
1262                 ptr += charsize;
1263                 buflen -= charsize;
1264         }
1265
1266         /* keep any uncomplete utf8 char for the next call */
1267         memmove(buf, ptr, buflen);
1268 }
1269
1270 void
1271 ttywrite(const char *s, size_t n) {
1272         if(write(cmdfd, s, n) == -1)
1273                 die("write error on tty: %s\n", strerror(errno));
1274 }
1275
1276 void
1277 ttysend(char *s, size_t n) {
1278         ttywrite(s, n);
1279         if(IS_SET(MODE_ECHO))
1280                 techo(s, n);
1281 }
1282
1283 void
1284 ttyresize(void) {
1285         struct winsize w;
1286
1287         w.ws_row = term.row;
1288         w.ws_col = term.col;
1289         w.ws_xpixel = xw.tw;
1290         w.ws_ypixel = xw.th;
1291         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1292                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1293 }
1294
1295 int
1296 tattrset(int attr) {
1297         int i, j;
1298
1299         for(i = 0; i < term.row-1; i++) {
1300                 for(j = 0; j < term.col-1; j++) {
1301                         if(term.line[i][j].mode & attr)
1302                                 return 1;
1303                 }
1304         }
1305
1306         return 0;
1307 }
1308
1309 void
1310 tsetdirt(int top, int bot) {
1311         int i;
1312
1313         LIMIT(top, 0, term.row-1);
1314         LIMIT(bot, 0, term.row-1);
1315
1316         for(i = top; i <= bot; i++)
1317                 term.dirty[i] = 1;
1318 }
1319
1320 void
1321 tsetdirtattr(int attr) {
1322         int i, j;
1323
1324         for(i = 0; i < term.row-1; i++) {
1325                 for(j = 0; j < term.col-1; j++) {
1326                         if(term.line[i][j].mode & attr) {
1327                                 tsetdirt(i, i);
1328                                 break;
1329                         }
1330                 }
1331         }
1332 }
1333
1334 void
1335 tfulldirt(void) {
1336         tsetdirt(0, term.row-1);
1337 }
1338
1339 void
1340 tcursor(int mode) {
1341         static TCursor c[2];
1342         bool alt = IS_SET(MODE_ALTSCREEN);
1343
1344         if(mode == CURSOR_SAVE) {
1345                 c[alt] = term.c;
1346         } else if(mode == CURSOR_LOAD) {
1347                 term.c = c[alt];
1348                 tmoveto(c[alt].x, c[alt].y);
1349         }
1350 }
1351
1352 void
1353 treset(void) {
1354         uint i;
1355
1356         term.c = (TCursor){{
1357                 .mode = ATTR_NULL,
1358                 .fg = defaultfg,
1359                 .bg = defaultbg
1360         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1361
1362         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1363         for(i = tabspaces; i < term.col; i += tabspaces)
1364                 term.tabs[i] = 1;
1365         term.top = 0;
1366         term.bot = term.row - 1;
1367         term.mode = MODE_WRAP;
1368         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1369         term.charset = 0;
1370
1371         tclearregion(0, 0, term.col-1, term.row-1);
1372         tmoveto(0, 0);
1373         tcursor(CURSOR_SAVE);
1374 }
1375
1376 void
1377 tnew(int col, int row) {
1378         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1379         tresize(col, row);
1380         term.numlock = 1;
1381
1382         treset();
1383 }
1384
1385 void
1386 tswapscreen(void) {
1387         Line *tmp = term.line;
1388
1389         term.line = term.alt;
1390         term.alt = tmp;
1391         term.mode ^= MODE_ALTSCREEN;
1392         tfulldirt();
1393 }
1394
1395 void
1396 tscrolldown(int orig, int n) {
1397         int i;
1398         Line temp;
1399
1400         LIMIT(n, 0, term.bot-orig+1);
1401
1402         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1403
1404         for(i = term.bot; i >= orig+n; i--) {
1405                 temp = term.line[i];
1406                 term.line[i] = term.line[i-n];
1407                 term.line[i-n] = temp;
1408
1409                 term.dirty[i] = 1;
1410                 term.dirty[i-n] = 1;
1411         }
1412
1413         selscroll(orig, n);
1414 }
1415
1416 void
1417 tscrollup(int orig, int n) {
1418         int i;
1419         Line temp;
1420         LIMIT(n, 0, term.bot-orig+1);
1421
1422         tclearregion(0, orig, term.col-1, orig+n-1);
1423
1424         for(i = orig; i <= term.bot-n; i++) {
1425                  temp = term.line[i];
1426                  term.line[i] = term.line[i+n];
1427                  term.line[i+n] = temp;
1428
1429                  term.dirty[i] = 1;
1430                  term.dirty[i+n] = 1;
1431         }
1432
1433         selscroll(orig, -n);
1434 }
1435
1436 void
1437 selscroll(int orig, int n) {
1438         if(sel.ob.x == -1)
1439                 return;
1440
1441         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1442                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1443                         selclear(NULL);
1444                         return;
1445                 }
1446                 if(sel.type == SEL_RECTANGULAR) {
1447                         if(sel.ob.y < term.top)
1448                                 sel.ob.y = term.top;
1449                         if(sel.oe.y > term.bot)
1450                                 sel.oe.y = term.bot;
1451                 } else {
1452                         if(sel.ob.y < term.top) {
1453                                 sel.ob.y = term.top;
1454                                 sel.ob.x = 0;
1455                         }
1456                         if(sel.oe.y > term.bot) {
1457                                 sel.oe.y = term.bot;
1458                                 sel.oe.x = term.col;
1459                         }
1460                 }
1461                 selsort();
1462         }
1463 }
1464
1465 void
1466 tnewline(int first_col) {
1467         int y = term.c.y;
1468
1469         if(y == term.bot) {
1470                 tscrollup(term.top, 1);
1471         } else {
1472                 y++;
1473         }
1474         tmoveto(first_col ? 0 : term.c.x, y);
1475 }
1476
1477 void
1478 csiparse(void) {
1479         char *p = csiescseq.buf, *np;
1480         long int v;
1481
1482         csiescseq.narg = 0;
1483         if(*p == '?') {
1484                 csiescseq.priv = 1;
1485                 p++;
1486         }
1487
1488         csiescseq.buf[csiescseq.len] = '\0';
1489         while(p < csiescseq.buf+csiescseq.len) {
1490                 np = NULL;
1491                 v = strtol(p, &np, 10);
1492                 if(np == p)
1493                         v = 0;
1494                 if(v == LONG_MAX || v == LONG_MIN)
1495                         v = -1;
1496                 csiescseq.arg[csiescseq.narg++] = v;
1497                 p = np;
1498                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1499                         break;
1500                 p++;
1501         }
1502         csiescseq.mode = *p;
1503 }
1504
1505 /* for absolute user moves, when decom is set */
1506 void
1507 tmoveato(int x, int y) {
1508         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1509 }
1510
1511 void
1512 tmoveto(int x, int y) {
1513         int miny, maxy;
1514
1515         if(term.c.state & CURSOR_ORIGIN) {
1516                 miny = term.top;
1517                 maxy = term.bot;
1518         } else {
1519                 miny = 0;
1520                 maxy = term.row - 1;
1521         }
1522         LIMIT(x, 0, term.col-1);
1523         LIMIT(y, miny, maxy);
1524         term.c.state &= ~CURSOR_WRAPNEXT;
1525         term.c.x = x;
1526         term.c.y = y;
1527 }
1528
1529 void
1530 tsetchar(char *c, Glyph *attr, int x, int y) {
1531         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1532                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1533                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1534                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1535                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1536                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1537                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1538                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1539                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1540         };
1541
1542         /*
1543          * The table is proudly stolen from rxvt.
1544          */
1545         if(attr->mode & ATTR_GFX) {
1546                 if(c[0] >= 0x41 && c[0] <= 0x7e
1547                                 && vt100_0[c[0] - 0x41]) {
1548                         c = vt100_0[c[0] - 0x41];
1549                 }
1550         }
1551
1552         if(term.line[y][x].mode & ATTR_WIDE) {
1553                 if(x+1 < term.col) {
1554                         term.line[y][x+1].c[0] = ' ';
1555                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1556                 }
1557         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1558                 term.line[y][x-1].c[0] = ' ';
1559                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1560         }
1561
1562         term.dirty[y] = 1;
1563         term.line[y][x] = *attr;
1564         memcpy(term.line[y][x].c, c, UTF_SIZ);
1565 }
1566
1567 void
1568 tclearregion(int x1, int y1, int x2, int y2) {
1569         int x, y, temp;
1570
1571         if(x1 > x2)
1572                 temp = x1, x1 = x2, x2 = temp;
1573         if(y1 > y2)
1574                 temp = y1, y1 = y2, y2 = temp;
1575
1576         LIMIT(x1, 0, term.col-1);
1577         LIMIT(x2, 0, term.col-1);
1578         LIMIT(y1, 0, term.row-1);
1579         LIMIT(y2, 0, term.row-1);
1580
1581         for(y = y1; y <= y2; y++) {
1582                 term.dirty[y] = 1;
1583                 for(x = x1; x <= x2; x++) {
1584                         if(selected(x, y))
1585                                 selclear(NULL);
1586                         term.line[y][x] = term.c.attr;
1587                         memcpy(term.line[y][x].c, " ", 2);
1588                 }
1589         }
1590 }
1591
1592 void
1593 tdeletechar(int n) {
1594         int src = term.c.x + n;
1595         int dst = term.c.x;
1596         int size = term.col - src;
1597
1598         term.dirty[term.c.y] = 1;
1599
1600         if(src >= term.col) {
1601                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1602                 return;
1603         }
1604
1605         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1606                         size * sizeof(Glyph));
1607         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1608 }
1609
1610 void
1611 tinsertblank(int n) {
1612         int src = term.c.x;
1613         int dst = src + n;
1614         int size = term.col - dst;
1615
1616         term.dirty[term.c.y] = 1;
1617
1618         if(dst >= term.col) {
1619                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1620                 return;
1621         }
1622
1623         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1624                         size * sizeof(Glyph));
1625         tclearregion(src, term.c.y, dst - 1, term.c.y);
1626 }
1627
1628 void
1629 tinsertblankline(int n) {
1630         if(term.c.y < term.top || term.c.y > term.bot)
1631                 return;
1632
1633         tscrolldown(term.c.y, n);
1634 }
1635
1636 void
1637 tdeleteline(int n) {
1638         if(term.c.y < term.top || term.c.y > term.bot)
1639                 return;
1640
1641         tscrollup(term.c.y, n);
1642 }
1643
1644 int32_t
1645 tdefcolor(int *attr, int *npar, int l) {
1646         int32_t idx = -1;
1647         uint r, g, b;
1648
1649         switch (attr[*npar + 1]) {
1650         case 2: /* direct colour in RGB space */
1651                 if (*npar + 4 >= l) {
1652                         fprintf(stderr,
1653                                 "erresc(38): Incorrect number of parameters (%d)\n",
1654                                 *npar);
1655                         break;
1656                 }
1657                 r = attr[*npar + 2];
1658                 g = attr[*npar + 3];
1659                 b = attr[*npar + 4];
1660                 *npar += 4;
1661                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1662                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1663                                 r, g, b);
1664                 else
1665                         idx = TRUECOLOR(r, g, b);
1666                 break;
1667         case 5: /* indexed colour */
1668                 if (*npar + 2 >= l) {
1669                         fprintf(stderr,
1670                                 "erresc(38): Incorrect number of parameters (%d)\n",
1671                                 *npar);
1672                         break;
1673                 }
1674                 *npar += 2;
1675                 if(!BETWEEN(attr[*npar], 0, 255))
1676                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1677                 else
1678                         idx = attr[*npar];
1679                 break;
1680         case 0: /* implemented defined (only foreground) */
1681         case 1: /* transparent */
1682         case 3: /* direct colour in CMY space */
1683         case 4: /* direct colour in CMYK space */
1684         default:
1685                 fprintf(stderr,
1686                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1687         }
1688
1689         return idx;
1690 }
1691
1692 void
1693 tsetattr(int *attr, int l) {
1694         int i;
1695         int32_t idx;
1696
1697         for(i = 0; i < l; i++) {
1698                 switch(attr[i]) {
1699                 case 0:
1700                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1701                                         | ATTR_BOLD | ATTR_ITALIC \
1702                                         | ATTR_BLINK);
1703                         term.c.attr.fg = defaultfg;
1704                         term.c.attr.bg = defaultbg;
1705                         break;
1706                 case 1:
1707                         term.c.attr.mode |= ATTR_BOLD;
1708                         break;
1709                 case 3:
1710                         term.c.attr.mode |= ATTR_ITALIC;
1711                         break;
1712                 case 4:
1713                         term.c.attr.mode |= ATTR_UNDERLINE;
1714                         break;
1715                 case 5: /* slow blink */
1716                 case 6: /* rapid blink */
1717                         term.c.attr.mode |= ATTR_BLINK;
1718                         break;
1719                 case 7:
1720                         term.c.attr.mode |= ATTR_REVERSE;
1721                         break;
1722                 case 21:
1723                 case 22:
1724                         term.c.attr.mode &= ~ATTR_BOLD;
1725                         break;
1726                 case 23:
1727                         term.c.attr.mode &= ~ATTR_ITALIC;
1728                         break;
1729                 case 24:
1730                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1731                         break;
1732                 case 25:
1733                 case 26:
1734                         term.c.attr.mode &= ~ATTR_BLINK;
1735                         break;
1736                 case 27:
1737                         term.c.attr.mode &= ~ATTR_REVERSE;
1738                         break;
1739                 case 38:
1740                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1741                                 term.c.attr.fg = idx;
1742                         break;
1743                 case 39:
1744                         term.c.attr.fg = defaultfg;
1745                         break;
1746                 case 48:
1747                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1748                                 term.c.attr.bg = idx;
1749                         break;
1750                 case 49:
1751                         term.c.attr.bg = defaultbg;
1752                         break;
1753                 default:
1754                         if(BETWEEN(attr[i], 30, 37)) {
1755                                 term.c.attr.fg = attr[i] - 30;
1756                         } else if(BETWEEN(attr[i], 40, 47)) {
1757                                 term.c.attr.bg = attr[i] - 40;
1758                         } else if(BETWEEN(attr[i], 90, 97)) {
1759                                 term.c.attr.fg = attr[i] - 90 + 8;
1760                         } else if(BETWEEN(attr[i], 100, 107)) {
1761                                 term.c.attr.bg = attr[i] - 100 + 8;
1762                         } else {
1763                                 fprintf(stderr,
1764                                         "erresc(default): gfx attr %d unknown\n",
1765                                         attr[i]), csidump();
1766                         }
1767                         break;
1768                 }
1769         }
1770 }
1771
1772 void
1773 tsetscroll(int t, int b) {
1774         int temp;
1775
1776         LIMIT(t, 0, term.row-1);
1777         LIMIT(b, 0, term.row-1);
1778         if(t > b) {
1779                 temp = t;
1780                 t = b;
1781                 b = temp;
1782         }
1783         term.top = t;
1784         term.bot = b;
1785 }
1786
1787 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1788
1789 void
1790 tsetmode(bool priv, bool set, int *args, int narg) {
1791         int *lim, mode;
1792         bool alt;
1793
1794         for(lim = args + narg; args < lim; ++args) {
1795                 if(priv) {
1796                         switch(*args) {
1797                                 break;
1798                         case 1: /* DECCKM -- Cursor key */
1799                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1800                                 break;
1801                         case 5: /* DECSCNM -- Reverse video */
1802                                 mode = term.mode;
1803                                 MODBIT(term.mode, set, MODE_REVERSE);
1804                                 if(mode != term.mode)
1805                                         redraw(REDRAW_TIMEOUT);
1806                                 break;
1807                         case 6: /* DECOM -- Origin */
1808                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1809                                 tmoveato(0, 0);
1810                                 break;
1811                         case 7: /* DECAWM -- Auto wrap */
1812                                 MODBIT(term.mode, set, MODE_WRAP);
1813                                 break;
1814                         case 0:  /* Error (IGNORED) */
1815                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1816                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1817                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1818                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1819                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1820                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1821                         case 42: /* DECNRCM -- National characters (IGNORED) */
1822                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1823                                 break;
1824                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1825                                 MODBIT(term.mode, !set, MODE_HIDE);
1826                                 break;
1827                         case 9:    /* X10 mouse compatibility mode */
1828                                 xsetpointermotion(0);
1829                                 MODBIT(term.mode, 0, MODE_MOUSE);
1830                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1831                                 break;
1832                         case 1000: /* 1000: report button press */
1833                                 xsetpointermotion(0);
1834                                 MODBIT(term.mode, 0, MODE_MOUSE);
1835                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1836                                 break;
1837                         case 1002: /* 1002: report motion on button press */
1838                                 xsetpointermotion(0);
1839                                 MODBIT(term.mode, 0, MODE_MOUSE);
1840                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1841                                 break;
1842                         case 1003: /* 1003: enable all mouse motions */
1843                                 xsetpointermotion(set);
1844                                 MODBIT(term.mode, 0, MODE_MOUSE);
1845                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1846                                 break;
1847                         case 1004: /* 1004: send focus events to tty */
1848                                 MODBIT(term.mode, set, MODE_FOCUS);
1849                                 break;
1850                         case 1006: /* 1006: extended reporting mode */
1851                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1852                                 break;
1853                         case 1034:
1854                                 MODBIT(term.mode, set, MODE_8BIT);
1855                                 break;
1856                         case 1049: /* swap screen & set/restore cursor as xterm */
1857                                 if (!allowaltscreen)
1858                                         break;
1859                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1860                                 /* FALLTHRU */
1861                         case 47: /* swap screen */
1862                         case 1047:
1863                                 if (!allowaltscreen)
1864                                         break;
1865                                 alt = IS_SET(MODE_ALTSCREEN);
1866                                 if(alt) {
1867                                         tclearregion(0, 0, term.col-1,
1868                                                         term.row-1);
1869                                 }
1870                                 if(set ^ alt) /* set is always 1 or 0 */
1871                                         tswapscreen();
1872                                 if(*args != 1049)
1873                                         break;
1874                                 /* FALLTRU */
1875                         case 1048:
1876                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1877                                 break;
1878                         case 2004: /* 2004: bracketed paste mode */
1879                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1880                                 break;
1881                         /* Not implemented mouse modes. See comments there. */
1882                         case 1001: /* mouse highlight mode; can hang the
1883                                       terminal by design when implemented. */
1884                         case 1005: /* UTF-8 mouse mode; will confuse
1885                                       applications not supporting UTF-8
1886                                       and luit. */
1887                         case 1015: /* urxvt mangled mouse mode; incompatible
1888                                       and can be mistaken for other control
1889                                       codes. */
1890                         default:
1891                                 fprintf(stderr,
1892                                         "erresc: unknown private set/reset mode %d\n",
1893                                         *args);
1894                                 break;
1895                         }
1896                 } else {
1897                         switch(*args) {
1898                         case 0:  /* Error (IGNORED) */
1899                                 break;
1900                         case 2:  /* KAM -- keyboard action */
1901                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1902                                 break;
1903                         case 4:  /* IRM -- Insertion-replacement */
1904                                 MODBIT(term.mode, set, MODE_INSERT);
1905                                 break;
1906                         case 12: /* SRM -- Send/Receive */
1907                                 MODBIT(term.mode, !set, MODE_ECHO);
1908                                 break;
1909                         case 20: /* LNM -- Linefeed/new line */
1910                                 MODBIT(term.mode, set, MODE_CRLF);
1911                                 break;
1912                         default:
1913                                 fprintf(stderr,
1914                                         "erresc: unknown set/reset mode %d\n",
1915                                         *args);
1916                                 break;
1917                         }
1918                 }
1919         }
1920 }
1921
1922 void
1923 csihandle(void) {
1924         char buf[40];
1925         int len;
1926
1927         switch(csiescseq.mode) {
1928         default:
1929         unknown:
1930                 fprintf(stderr, "erresc: unknown csi ");
1931                 csidump();
1932                 /* die(""); */
1933                 break;
1934         case '@': /* ICH -- Insert <n> blank char */
1935                 DEFAULT(csiescseq.arg[0], 1);
1936                 tinsertblank(csiescseq.arg[0]);
1937                 break;
1938         case 'A': /* CUU -- Cursor <n> Up */
1939                 DEFAULT(csiescseq.arg[0], 1);
1940                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1941                 break;
1942         case 'B': /* CUD -- Cursor <n> Down */
1943         case 'e': /* VPR --Cursor <n> Down */
1944                 DEFAULT(csiescseq.arg[0], 1);
1945                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1946                 break;
1947         case 'i': /* MC -- Media Copy */
1948                 switch(csiescseq.arg[0]) {
1949                 case 0:
1950                         tdump();
1951                         break;
1952                 case 1:
1953                         tdumpline(term.c.y);
1954                         break;
1955                 case 2:
1956                         tdumpsel();
1957                         break;
1958                 case 4:
1959                         term.mode &= ~MODE_PRINT;
1960                         break;
1961                 case 5:
1962                         term.mode |= MODE_PRINT;
1963                         break;
1964                 }
1965                 break;
1966         case 'c': /* DA -- Device Attributes */
1967                 if(csiescseq.arg[0] == 0)
1968                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1969                 break;
1970         case 'C': /* CUF -- Cursor <n> Forward */
1971         case 'a': /* HPR -- Cursor <n> Forward */
1972                 DEFAULT(csiescseq.arg[0], 1);
1973                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1974                 break;
1975         case 'D': /* CUB -- Cursor <n> Backward */
1976                 DEFAULT(csiescseq.arg[0], 1);
1977                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1978                 break;
1979         case 'E': /* CNL -- Cursor <n> Down and first col */
1980                 DEFAULT(csiescseq.arg[0], 1);
1981                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1982                 break;
1983         case 'F': /* CPL -- Cursor <n> Up and first col */
1984                 DEFAULT(csiescseq.arg[0], 1);
1985                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1986                 break;
1987         case 'g': /* TBC -- Tabulation clear */
1988                 switch(csiescseq.arg[0]) {
1989                 case 0: /* clear current tab stop */
1990                         term.tabs[term.c.x] = 0;
1991                         break;
1992                 case 3: /* clear all the tabs */
1993                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1994                         break;
1995                 default:
1996                         goto unknown;
1997                 }
1998                 break;
1999         case 'G': /* CHA -- Move to <col> */
2000         case '`': /* HPA */
2001                 DEFAULT(csiescseq.arg[0], 1);
2002                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2003                 break;
2004         case 'H': /* CUP -- Move to <row> <col> */
2005         case 'f': /* HVP */
2006                 DEFAULT(csiescseq.arg[0], 1);
2007                 DEFAULT(csiescseq.arg[1], 1);
2008                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2009                 break;
2010         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2011                 DEFAULT(csiescseq.arg[0], 1);
2012                 while(csiescseq.arg[0]--)
2013                         tputtab(1);
2014                 break;
2015         case 'J': /* ED -- Clear screen */
2016                 selclear(NULL);
2017                 switch(csiescseq.arg[0]) {
2018                 case 0: /* below */
2019                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2020                         if(term.c.y < term.row-1) {
2021                                 tclearregion(0, term.c.y+1, term.col-1,
2022                                                 term.row-1);
2023                         }
2024                         break;
2025                 case 1: /* above */
2026                         if(term.c.y > 1)
2027                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2028                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2029                         break;
2030                 case 2: /* all */
2031                         tclearregion(0, 0, term.col-1, term.row-1);
2032                         break;
2033                 default:
2034                         goto unknown;
2035                 }
2036                 break;
2037         case 'K': /* EL -- Clear line */
2038                 switch(csiescseq.arg[0]) {
2039                 case 0: /* right */
2040                         tclearregion(term.c.x, term.c.y, term.col-1,
2041                                         term.c.y);
2042                         break;
2043                 case 1: /* left */
2044                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2045                         break;
2046                 case 2: /* all */
2047                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2048                         break;
2049                 }
2050                 break;
2051         case 'S': /* SU -- Scroll <n> line up */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tscrollup(term.top, csiescseq.arg[0]);
2054                 break;
2055         case 'T': /* SD -- Scroll <n> line down */
2056                 DEFAULT(csiescseq.arg[0], 1);
2057                 tscrolldown(term.top, csiescseq.arg[0]);
2058                 break;
2059         case 'L': /* IL -- Insert <n> blank lines */
2060                 DEFAULT(csiescseq.arg[0], 1);
2061                 tinsertblankline(csiescseq.arg[0]);
2062                 break;
2063         case 'l': /* RM -- Reset Mode */
2064                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2065                 break;
2066         case 'M': /* DL -- Delete <n> lines */
2067                 DEFAULT(csiescseq.arg[0], 1);
2068                 tdeleteline(csiescseq.arg[0]);
2069                 break;
2070         case 'X': /* ECH -- Erase <n> char */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tclearregion(term.c.x, term.c.y,
2073                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2074                 break;
2075         case 'P': /* DCH -- Delete <n> char */
2076                 DEFAULT(csiescseq.arg[0], 1);
2077                 tdeletechar(csiescseq.arg[0]);
2078                 break;
2079         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2080                 DEFAULT(csiescseq.arg[0], 1);
2081                 while(csiescseq.arg[0]--)
2082                         tputtab(0);
2083                 break;
2084         case 'd': /* VPA -- Move to <row> */
2085                 DEFAULT(csiescseq.arg[0], 1);
2086                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2087                 break;
2088         case 'h': /* SM -- Set terminal mode */
2089                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2090                 break;
2091         case 'm': /* SGR -- Terminal attribute (color) */
2092                 tsetattr(csiescseq.arg, csiescseq.narg);
2093                 break;
2094         case 'n': /* DSR – Device Status Report (cursor position) */
2095                 if (csiescseq.arg[0] == 6) {
2096                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2097                                         term.c.y+1, term.c.x+1);
2098                         ttywrite(buf, len);
2099                         break;
2100                 }
2101         case 'r': /* DECSTBM -- Set Scrolling Region */
2102                 if(csiescseq.priv) {
2103                         goto unknown;
2104                 } else {
2105                         DEFAULT(csiescseq.arg[0], 1);
2106                         DEFAULT(csiescseq.arg[1], term.row);
2107                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2108                         tmoveato(0, 0);
2109                 }
2110                 break;
2111         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2112                 tcursor(CURSOR_SAVE);
2113                 break;
2114         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2115                 tcursor(CURSOR_LOAD);
2116                 break;
2117         }
2118 }
2119
2120 void
2121 csidump(void) {
2122         int i;
2123         uint c;
2124
2125         printf("ESC[");
2126         for(i = 0; i < csiescseq.len; i++) {
2127                 c = csiescseq.buf[i] & 0xff;
2128                 if(isprint(c)) {
2129                         putchar(c);
2130                 } else if(c == '\n') {
2131                         printf("(\\n)");
2132                 } else if(c == '\r') {
2133                         printf("(\\r)");
2134                 } else if(c == 0x1b) {
2135                         printf("(\\e)");
2136                 } else {
2137                         printf("(%02x)", c);
2138                 }
2139         }
2140         putchar('\n');
2141 }
2142
2143 void
2144 csireset(void) {
2145         memset(&csiescseq, 0, sizeof(csiescseq));
2146 }
2147
2148 void
2149 strhandle(void) {
2150         char *p = NULL;
2151         int j, narg, par;
2152
2153         strparse();
2154         narg = strescseq.narg;
2155         par = atoi(strescseq.args[0]);
2156
2157         switch(strescseq.type) {
2158         case ']': /* OSC -- Operating System Command */
2159                 switch(par) {
2160                 case 0:
2161                 case 1:
2162                 case 2:
2163                         if(narg > 1)
2164                                 xsettitle(strescseq.args[1]);
2165                         return;
2166                 case 4: /* color set */
2167                         if(narg < 3)
2168                                 break;
2169                         p = strescseq.args[2];
2170                         /* fall through */
2171                 case 104: /* color reset, here p = NULL */
2172                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2173                         if (!xsetcolorname(j, p)) {
2174                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2175                         } else {
2176                                 /*
2177                                  * TODO if defaultbg color is changed, borders
2178                                  * are dirty
2179                                  */
2180                                 redraw(0);
2181                         }
2182                         return;
2183                 }
2184                 break;
2185         case 'k': /* old title set compatibility */
2186                 xsettitle(strescseq.args[0]);
2187                 return;
2188         case 'P': /* DSC -- Device Control String */
2189         case '_': /* APC -- Application Program Command */
2190         case '^': /* PM -- Privacy Message */
2191                 return;
2192         }
2193
2194         fprintf(stderr, "erresc: unknown str ");
2195         strdump();
2196 }
2197
2198 void
2199 strparse(void) {
2200         char *p = strescseq.buf;
2201
2202         strescseq.narg = 0;
2203         strescseq.buf[strescseq.len] = '\0';
2204         while(p && strescseq.narg < STR_ARG_SIZ)
2205                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2206 }
2207
2208 void
2209 strdump(void) {
2210         int i;
2211         uint c;
2212
2213         printf("ESC%c", strescseq.type);
2214         for(i = 0; i < strescseq.len; i++) {
2215                 c = strescseq.buf[i] & 0xff;
2216                 if(c == '\0') {
2217                         return;
2218                 } else if(isprint(c)) {
2219                         putchar(c);
2220                 } else if(c == '\n') {
2221                         printf("(\\n)");
2222                 } else if(c == '\r') {
2223                         printf("(\\r)");
2224                 } else if(c == 0x1b) {
2225                         printf("(\\e)");
2226                 } else {
2227                         printf("(%02x)", c);
2228                 }
2229         }
2230         printf("ESC\\\n");
2231 }
2232
2233 void
2234 strreset(void) {
2235         memset(&strescseq, 0, sizeof(strescseq));
2236 }
2237
2238 void
2239 tprinter(char *s, size_t len) {
2240         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2241                 fprintf(stderr, "Error writing in %s:%s\n",
2242                         opt_io, strerror(errno));
2243                 close(iofd);
2244                 iofd = -1;
2245         }
2246 }
2247
2248 void
2249 toggleprinter(const Arg *arg) {
2250         term.mode ^= MODE_PRINT;
2251 }
2252
2253 void
2254 printscreen(const Arg *arg) {
2255         tdump();
2256 }
2257
2258 void
2259 printsel(const Arg *arg) {
2260         tdumpsel();
2261 }
2262
2263 void
2264 tdumpsel(void)
2265 {
2266         char *ptr;
2267
2268         if((ptr = getsel())) {
2269                 tprinter(ptr, strlen(ptr));
2270                 free(ptr);
2271         }
2272 }
2273
2274 void
2275 tdumpline(int n) {
2276         Glyph *bp, *end;
2277
2278         bp = &term.line[n][0];
2279         end = &bp[term.col-1];
2280         while(end > bp && !strcmp(" ", end->c))
2281                 --end;
2282         if(bp != end || strcmp(bp->c, " ")) {
2283                 for( ;bp <= end; ++bp)
2284                         tprinter(bp->c, strlen(bp->c));
2285         }
2286         tprinter("\n", 1);
2287 }
2288
2289 void
2290 tdump(void) {
2291         int i;
2292
2293         for(i = 0; i < term.row; ++i)
2294                 tdumpline(i);
2295 }
2296
2297 void
2298 tputtab(bool forward) {
2299         uint x = term.c.x;
2300
2301         if(forward) {
2302                 if(x == term.col)
2303                         return;
2304                 for(++x; x < term.col && !term.tabs[x]; ++x)
2305                         /* nothing */ ;
2306         } else {
2307                 if(x == 0)
2308                         return;
2309                 for(--x; x > 0 && !term.tabs[x]; --x)
2310                         /* nothing */ ;
2311         }
2312         tmoveto(x, term.c.y);
2313 }
2314
2315 void
2316 techo(char *buf, int len) {
2317         for(; len > 0; buf++, len--) {
2318                 char c = *buf;
2319
2320                 if(c < '\x20') { /* control code */
2321                         if(c != '\n' && c != '\r' && c != '\t') {
2322                                 c |= '\x40';
2323                                 tputc("^", 1);
2324                         }
2325                         tputc(&c, 1);
2326                 } else {
2327                         break;
2328                 }
2329         }
2330         if(len)
2331                 tputc(buf, len);
2332 }
2333
2334 void
2335 tdeftran(char ascii) {
2336         char c, (*bp)[2];
2337         static char tbl[][2] = {
2338                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2339                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2340                 {'5', CS_FIN},      {'C', CS_FIN},
2341                 {0, 0}
2342         };
2343
2344         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2345                 /* nothing */;
2346
2347         if (c == 0)
2348                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2349         else
2350                 term.trantbl[term.icharset] = (*bp)[1];
2351 }
2352
2353 void
2354 tselcs(void) {
2355         if (term.trantbl[term.charset] == CS_GRAPHIC0)
2356                 term.c.attr.mode |= ATTR_GFX;
2357         else
2358                 term.c.attr.mode &= ~ATTR_GFX;
2359 }
2360
2361 void
2362 tputc(char *c, int len) {
2363         uchar ascii = *c;
2364         bool control = ascii < '\x20' || ascii == 0177;
2365         long unicodep;
2366         int width;
2367
2368         if(len == 1) {
2369                 width = 1;
2370         } else {
2371                 utf8decode(c, &unicodep, UTF_SIZ);
2372                 width = wcwidth(unicodep);
2373         }
2374
2375         if(IS_SET(MODE_PRINT))
2376                 tprinter(c, len);
2377
2378         /*
2379          * STR sequences must be checked before anything else
2380          * because it can use some control codes as part of the sequence.
2381          */
2382         if(term.esc & ESC_STR) {
2383                 switch(ascii) {
2384                 case '\033':
2385                         term.esc = ESC_START | ESC_STR_END;
2386                         break;
2387                 case '\a': /* backwards compatibility to xterm */
2388                         term.esc = 0;
2389                         strhandle();
2390                         break;
2391                 default:
2392                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2393                                 memmove(&strescseq.buf[strescseq.len], c, len);
2394                                 strescseq.len += len;
2395                         } else {
2396                         /*
2397                          * Here is a bug in terminals. If the user never sends
2398                          * some code to stop the str or esc command, then st
2399                          * will stop responding. But this is better than
2400                          * silently failing with unknown characters. At least
2401                          * then users will report back.
2402                          *
2403                          * In the case users ever get fixed, here is the code:
2404                          */
2405                         /*
2406                          * term.esc = 0;
2407                          * strhandle();
2408                          */
2409                         }
2410                 }
2411                 return;
2412         }
2413
2414         /*
2415          * Actions of control codes must be performed as soon they arrive
2416          * because they can be embedded inside a control sequence, and
2417          * they must not cause conflicts with sequences.
2418          */
2419         if(control) {
2420                 switch(ascii) {
2421                 case '\t':   /* HT */
2422                         tputtab(1);
2423                         return;
2424                 case '\b':   /* BS */
2425                         tmoveto(term.c.x-1, term.c.y);
2426                         return;
2427                 case '\r':   /* CR */
2428                         tmoveto(0, term.c.y);
2429                         return;
2430                 case '\f':   /* LF */
2431                 case '\v':   /* VT */
2432                 case '\n':   /* LF */
2433                         /* go to first col if the mode is set */
2434                         tnewline(IS_SET(MODE_CRLF));
2435                         return;
2436                 case '\a':   /* BEL */
2437                         if(!(xw.state & WIN_FOCUSED))
2438                                 xseturgency(1);
2439                         if (bellvolume)
2440                                 XBell(xw.dpy, bellvolume);
2441                         return;
2442                 case '\033': /* ESC */
2443                         csireset();
2444                         term.esc = ESC_START;
2445                         return;
2446                 case '\016': /* SO */
2447                         term.charset = 0;
2448                         tselcs();
2449                         return;
2450                 case '\017': /* SI */
2451                         term.charset = 1;
2452                         tselcs();
2453                         return;
2454                 case '\032': /* SUB */
2455                 case '\030': /* CAN */
2456                         csireset();
2457                         return;
2458                 case '\005': /* ENQ (IGNORED) */
2459                 case '\000': /* NUL (IGNORED) */
2460                 case '\021': /* XON (IGNORED) */
2461                 case '\023': /* XOFF (IGNORED) */
2462                 case 0177:   /* DEL (IGNORED) */
2463                         return;
2464                 }
2465         } else if(term.esc & ESC_START) {
2466                 if(term.esc & ESC_CSI) {
2467                         csiescseq.buf[csiescseq.len++] = ascii;
2468                         if(BETWEEN(ascii, 0x40, 0x7E)
2469                                         || csiescseq.len >= \
2470                                         sizeof(csiescseq.buf)-1) {
2471                                 term.esc = 0;
2472                                 csiparse();
2473                                 csihandle();
2474                         }
2475                 } else if(term.esc & ESC_STR_END) {
2476                         term.esc = 0;
2477                         if(ascii == '\\')
2478                                 strhandle();
2479                 } else if(term.esc & ESC_ALTCHARSET) {
2480                         tdeftran(ascii);
2481                         tselcs();
2482                         term.esc = 0;
2483                 } else if(term.esc & ESC_TEST) {
2484                         if(ascii == '8') { /* DEC screen alignment test. */
2485                                 char E[UTF_SIZ] = "E";
2486                                 int x, y;
2487
2488                                 for(x = 0; x < term.col; ++x) {
2489                                         for(y = 0; y < term.row; ++y)
2490                                                 tsetchar(E, &term.c.attr, x, y);
2491                                 }
2492                         }
2493                         term.esc = 0;
2494                 } else {
2495                         switch(ascii) {
2496                         case '[':
2497                                 term.esc |= ESC_CSI;
2498                                 break;
2499                         case '#':
2500                                 term.esc |= ESC_TEST;
2501                                 break;
2502                         case 'P': /* DCS -- Device Control String */
2503                         case '_': /* APC -- Application Program Command */
2504                         case '^': /* PM -- Privacy Message */
2505                         case ']': /* OSC -- Operating System Command */
2506                         case 'k': /* old title set compatibility */
2507                                 strreset();
2508                                 strescseq.type = ascii;
2509                                 term.esc |= ESC_STR;
2510                                 break;
2511                         case '(': /* set primary charset G0 */
2512                         case ')': /* set secondary charset G1 */
2513                         case '*': /* set tertiary charset G2 */
2514                         case '+': /* set quaternary charset G3 */
2515                                 term.icharset = ascii - '(';
2516                                 term.esc |= ESC_ALTCHARSET;
2517                                 break;
2518                         case 'D': /* IND -- Linefeed */
2519                                 if(term.c.y == term.bot) {
2520                                         tscrollup(term.top, 1);
2521                                 } else {
2522                                         tmoveto(term.c.x, term.c.y+1);
2523                                 }
2524                                 term.esc = 0;
2525                                 break;
2526                         case 'E': /* NEL -- Next line */
2527                                 tnewline(1); /* always go to first col */
2528                                 term.esc = 0;
2529                                 break;
2530                         case 'H': /* HTS -- Horizontal tab stop */
2531                                 term.tabs[term.c.x] = 1;
2532                                 term.esc = 0;
2533                                 break;
2534                         case 'M': /* RI -- Reverse index */
2535                                 if(term.c.y == term.top) {
2536                                         tscrolldown(term.top, 1);
2537                                 } else {
2538                                         tmoveto(term.c.x, term.c.y-1);
2539                                 }
2540                                 term.esc = 0;
2541                                 break;
2542                         case 'Z': /* DECID -- Identify Terminal */
2543                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2544                                 term.esc = 0;
2545                                 break;
2546                         case 'c': /* RIS -- Reset to inital state */
2547                                 treset();
2548                                 term.esc = 0;
2549                                 xresettitle();
2550                                 xloadcols();
2551                                 break;
2552                         case '=': /* DECPAM -- Application keypad */
2553                                 term.mode |= MODE_APPKEYPAD;
2554                                 term.esc = 0;
2555                                 break;
2556                         case '>': /* DECPNM -- Normal keypad */
2557                                 term.mode &= ~MODE_APPKEYPAD;
2558                                 term.esc = 0;
2559                                 break;
2560                         case '7': /* DECSC -- Save Cursor */
2561                                 tcursor(CURSOR_SAVE);
2562                                 term.esc = 0;
2563                                 break;
2564                         case '8': /* DECRC -- Restore Cursor */
2565                                 tcursor(CURSOR_LOAD);
2566                                 term.esc = 0;
2567                                 break;
2568                         case '\\': /* ST -- Stop */
2569                                 term.esc = 0;
2570                                 break;
2571                         default:
2572                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2573                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2574                                 term.esc = 0;
2575                         }
2576                 }
2577                 /*
2578                  * All characters which form part of a sequence are not
2579                  * printed
2580                  */
2581                 return;
2582         }
2583         /*
2584          * Display control codes only if we are in graphic mode
2585          */
2586         if(control && !(term.c.attr.mode & ATTR_GFX))
2587                 return;
2588         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2589                 selclear(NULL);
2590         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2591                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2592                 tnewline(1);
2593         }
2594
2595         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2596                 memmove(&term.line[term.c.y][term.c.x+1],
2597                         &term.line[term.c.y][term.c.x],
2598                         (term.col - term.c.x - 1) * sizeof(Glyph));
2599         }
2600
2601         if(term.c.x+width > term.col)
2602                 tnewline(1);
2603
2604         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2605
2606         if(width == 2) {
2607                 term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
2608                 if(term.c.x+1 < term.col) {
2609                         term.line[term.c.y][term.c.x+1].c[0] = '\0';
2610                         term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
2611                 }
2612         }
2613         if(term.c.x+width < term.col) {
2614                 tmoveto(term.c.x+width, term.c.y);
2615         } else {
2616                 term.c.state |= CURSOR_WRAPNEXT;
2617         }
2618 }
2619
2620 int
2621 tresize(int col, int row) {
2622         int i;
2623         int minrow = MIN(row, term.row);
2624         int mincol = MIN(col, term.col);
2625         int slide = term.c.y - row + 1;
2626         bool *bp;
2627         Line *orig;
2628
2629         if(col < 1 || row < 1)
2630                 return 0;
2631
2632         /* free unneeded rows */
2633         i = 0;
2634         if(slide > 0) {
2635                 /*
2636                  * slide screen to keep cursor where we expect it -
2637                  * tscrollup would work here, but we can optimize to
2638                  * memmove because we're freeing the earlier lines
2639                  */
2640                 for(/* i = 0 */; i < slide; i++) {
2641                         free(term.line[i]);
2642                         free(term.alt[i]);
2643                 }
2644                 memmove(term.line, term.line + slide, row * sizeof(Line));
2645                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2646         }
2647         for(i += row; i < term.row; i++) {
2648                 free(term.line[i]);
2649                 free(term.alt[i]);
2650         }
2651
2652         /* resize to new height */
2653         term.line = xrealloc(term.line, row * sizeof(Line));
2654         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2655         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2656         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2657
2658         /* resize each row to new width, zero-pad if needed */
2659         for(i = 0; i < minrow; i++) {
2660                 term.dirty[i] = 1;
2661                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2662                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2663         }
2664
2665         /* allocate any new rows */
2666         for(/* i == minrow */; i < row; i++) {
2667                 term.dirty[i] = 1;
2668                 term.line[i] = xmalloc(col * sizeof(Glyph));
2669                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2670         }
2671         if(col > term.col) {
2672                 bp = term.tabs + term.col;
2673
2674                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2675                 while(--bp > term.tabs && !*bp)
2676                         /* nothing */ ;
2677                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2678                         *bp = 1;
2679         }
2680         /* update terminal size */
2681         term.col = col;
2682         term.row = row;
2683         /* reset scrolling region */
2684         tsetscroll(0, row-1);
2685         /* make use of the LIMIT in tmoveto */
2686         tmoveto(term.c.x, term.c.y);
2687         /* Clearing both screens */
2688         orig = term.line;
2689         do {
2690                 if(mincol < col && 0 < minrow) {
2691                         tclearregion(mincol, 0, col - 1, minrow - 1);
2692                 }
2693                 if(0 < col && minrow < row) {
2694                         tclearregion(0, minrow, col - 1, row - 1);
2695                 }
2696                 tswapscreen();
2697         } while(orig != term.line);
2698
2699         return (slide > 0);
2700 }
2701
2702 void
2703 xresize(int col, int row) {
2704         xw.tw = MAX(1, col * xw.cw);
2705         xw.th = MAX(1, row * xw.ch);
2706
2707         XFreePixmap(xw.dpy, xw.buf);
2708         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2709                         DefaultDepth(xw.dpy, xw.scr));
2710         XftDrawChange(xw.draw, xw.buf);
2711         xclear(0, 0, xw.w, xw.h);
2712 }
2713
2714 static inline ushort
2715 sixd_to_16bit(int x) {
2716         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2717 }
2718
2719 void
2720 xloadcols(void) {
2721         int i, r, g, b;
2722         XRenderColor color = { .alpha = 0xffff };
2723         static bool loaded;
2724         Colour *cp;
2725
2726         if(loaded) {
2727                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2728                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2729         }
2730
2731         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2732         for(i = 0; i < LEN(colorname); i++) {
2733                 if(!colorname[i])
2734                         continue;
2735                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2736                         die("Could not allocate color '%s'\n", colorname[i]);
2737                 }
2738         }
2739
2740         /* load colors [16-255] ; same colors as xterm */
2741         for(i = 16, r = 0; r < 6; r++) {
2742                 for(g = 0; g < 6; g++) {
2743                         for(b = 0; b < 6; b++) {
2744                                 color.red = sixd_to_16bit(r);
2745                                 color.green = sixd_to_16bit(g);
2746                                 color.blue = sixd_to_16bit(b);
2747                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2748                                         die("Could not allocate color %d\n", i);
2749                                 }
2750                                 i++;
2751                         }
2752                 }
2753         }
2754
2755         for(r = 0; r < 24; r++, i++) {
2756                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2757                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2758                                         &dc.col[i])) {
2759                         die("Could not allocate color %d\n", i);
2760                 }
2761         }
2762         loaded = true;
2763 }
2764
2765 int
2766 xsetcolorname(int x, const char *name) {
2767         XRenderColor color = { .alpha = 0xffff };
2768         Colour colour;
2769         if (x < 0 || x > LEN(colorname))
2770                 return -1;
2771         if(!name) {
2772                 if(16 <= x && x < 16 + 216) {
2773                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2774                         color.red = sixd_to_16bit(r);
2775                         color.green = sixd_to_16bit(g);
2776                         color.blue = sixd_to_16bit(b);
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 if (16 + 216 <= x && x < 256) {
2782                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2783                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2784                                 return 0; /* something went wrong */
2785                         dc.col[x] = colour;
2786                         return 1;
2787                 } else {
2788                         name = colorname[x];
2789                 }
2790         }
2791         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2792                 return 0;
2793         dc.col[x] = colour;
2794         return 1;
2795 }
2796
2797 void
2798 xtermclear(int col1, int row1, int col2, int row2) {
2799         XftDrawRect(xw.draw,
2800                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2801                         borderpx + col1 * xw.cw,
2802                         borderpx + row1 * xw.ch,
2803                         (col2-col1+1) * xw.cw,
2804                         (row2-row1+1) * xw.ch);
2805 }
2806
2807 /*
2808  * Absolute coordinates.
2809  */
2810 void
2811 xclear(int x1, int y1, int x2, int y2) {
2812         XftDrawRect(xw.draw,
2813                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2814                         x1, y1, x2-x1, y2-y1);
2815 }
2816
2817 void
2818 xhints(void) {
2819         XClassHint class = {opt_class ? opt_class : termname, termname};
2820         XWMHints wm = {.flags = InputHint, .input = 1};
2821         XSizeHints *sizeh = NULL;
2822
2823         sizeh = XAllocSizeHints();
2824         if(xw.isfixed == False) {
2825                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2826                 sizeh->height = xw.h;
2827                 sizeh->width = xw.w;
2828                 sizeh->height_inc = xw.ch;
2829                 sizeh->width_inc = xw.cw;
2830                 sizeh->base_height = 2 * borderpx;
2831                 sizeh->base_width = 2 * borderpx;
2832         } else {
2833                 sizeh->flags = PMaxSize | PMinSize;
2834                 sizeh->min_width = sizeh->max_width = xw.fw;
2835                 sizeh->min_height = sizeh->max_height = xw.fh;
2836         }
2837
2838         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2839                         &class);
2840         XFree(sizeh);
2841 }
2842
2843 int
2844 xloadfont(Font *f, FcPattern *pattern) {
2845         FcPattern *match;
2846         FcResult result;
2847
2848         match = FcFontMatch(NULL, pattern, &result);
2849         if(!match)
2850                 return 1;
2851
2852         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2853                 FcPatternDestroy(match);
2854                 return 1;
2855         }
2856
2857         f->set = NULL;
2858         f->pattern = FcPatternDuplicate(pattern);
2859
2860         f->ascent = f->match->ascent;
2861         f->descent = f->match->descent;
2862         f->lbearing = 0;
2863         f->rbearing = f->match->max_advance_width;
2864
2865         f->height = f->ascent + f->descent;
2866         f->width = f->lbearing + f->rbearing;
2867
2868         return 0;
2869 }
2870
2871 void
2872 xloadfonts(char *fontstr, double fontsize) {
2873         FcPattern *pattern;
2874         FcResult r_sz, r_psz;
2875         double fontval;
2876
2877         if(fontstr[0] == '-') {
2878                 pattern = XftXlfdParse(fontstr, False, False);
2879         } else {
2880                 pattern = FcNameParse((FcChar8 *)fontstr);
2881         }
2882
2883         if(!pattern)
2884                 die("st: can't open font %s\n", fontstr);
2885
2886         if(fontsize > 0) {
2887                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2888                 FcPatternDel(pattern, FC_SIZE);
2889                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2890                 usedfontsize = fontsize;
2891         } else {
2892                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2893                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2894                 if(r_psz == FcResultMatch) {
2895                         usedfontsize = fontval;
2896                 } else if(r_sz == FcResultMatch) {
2897                         usedfontsize = -1;
2898                 } else {
2899                         /*
2900                          * Default font size is 12, if none given. This is to
2901                          * have a known usedfontsize value.
2902                          */
2903                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2904                         usedfontsize = 12;
2905                 }
2906         }
2907
2908         FcConfigSubstitute(0, pattern, FcMatchPattern);
2909         FcDefaultSubstitute(pattern);
2910
2911         if(xloadfont(&dc.font, pattern))
2912                 die("st: can't open font %s\n", fontstr);
2913
2914         if(usedfontsize < 0) {
2915                 FcPatternGetDouble(dc.font.match->pattern,
2916                                    FC_PIXEL_SIZE, 0, &fontval);
2917                 usedfontsize = fontval;
2918         }
2919
2920         /* Setting character width and height. */
2921         xw.cw = CEIL(dc.font.width * cwscale);
2922         xw.ch = CEIL(dc.font.height * chscale);
2923
2924         FcPatternDel(pattern, FC_SLANT);
2925         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2926         if(xloadfont(&dc.ifont, pattern))
2927                 die("st: can't open font %s\n", fontstr);
2928
2929         FcPatternDel(pattern, FC_WEIGHT);
2930         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2931         if(xloadfont(&dc.ibfont, pattern))
2932                 die("st: can't open font %s\n", fontstr);
2933
2934         FcPatternDel(pattern, FC_SLANT);
2935         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2936         if(xloadfont(&dc.bfont, pattern))
2937                 die("st: can't open font %s\n", fontstr);
2938
2939         FcPatternDestroy(pattern);
2940 }
2941
2942 int
2943 xloadfontset(Font *f) {
2944         FcResult result;
2945
2946         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2947                 return 1;
2948         return 0;
2949 }
2950
2951 void
2952 xunloadfont(Font *f) {
2953         XftFontClose(xw.dpy, f->match);
2954         FcPatternDestroy(f->pattern);
2955         if(f->set)
2956                 FcFontSetDestroy(f->set);
2957 }
2958
2959 void
2960 xunloadfonts(void) {
2961         int i;
2962
2963         /* Free the loaded fonts in the font cache.  */
2964         for(i = 0; i < frclen; i++) {
2965                 XftFontClose(xw.dpy, frc[i].font);
2966         }
2967         frclen = 0;
2968
2969         xunloadfont(&dc.font);
2970         xunloadfont(&dc.bfont);
2971         xunloadfont(&dc.ifont);
2972         xunloadfont(&dc.ibfont);
2973 }
2974
2975 void
2976 xzoom(const Arg *arg) {
2977         xunloadfonts();
2978         xloadfonts(usedfont, usedfontsize + arg->i);
2979         cresize(0, 0);
2980         redraw(0);
2981 }
2982
2983 void
2984 xinit(void) {
2985         XGCValues gcvalues;
2986         Cursor cursor;
2987         Window parent;
2988         int sw, sh;
2989         pid_t thispid = getpid();
2990
2991         if(!(xw.dpy = XOpenDisplay(NULL)))
2992                 die("Can't open display\n");
2993         xw.scr = XDefaultScreen(xw.dpy);
2994         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2995
2996         /* font */
2997         if(!FcInit())
2998                 die("Could not init fontconfig.\n");
2999
3000         usedfont = (opt_font == NULL)? font : opt_font;
3001         xloadfonts(usedfont, 0);
3002
3003         /* colors */
3004         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3005         xloadcols();
3006
3007         /* adjust fixed window geometry */
3008         if(xw.isfixed) {
3009                 sw = DisplayWidth(xw.dpy, xw.scr);
3010                 sh = DisplayHeight(xw.dpy, xw.scr);
3011                 if(xw.fx < 0)
3012                         xw.fx = sw + xw.fx - xw.fw - 1;
3013                 if(xw.fy < 0)
3014                         xw.fy = sh + xw.fy - xw.fh - 1;
3015
3016                 xw.h = xw.fh;
3017                 xw.w = xw.fw;
3018         } else {
3019                 /* window - default size */
3020                 xw.h = 2 * borderpx + term.row * xw.ch;
3021                 xw.w = 2 * borderpx + term.col * xw.cw;
3022                 xw.fx = 0;
3023                 xw.fy = 0;
3024         }
3025
3026         /* Events */
3027         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3028         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3029         xw.attrs.bit_gravity = NorthWestGravity;
3030         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3031                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3032                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3033         xw.attrs.colormap = xw.cmap;
3034
3035         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3036                         XRootWindow(xw.dpy, xw.scr);
3037         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
3038                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3039                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3040                         | CWEventMask | CWColormap, &xw.attrs);
3041
3042         memset(&gcvalues, 0, sizeof(gcvalues));
3043         gcvalues.graphics_exposures = False;
3044         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3045                         &gcvalues);
3046         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3047                         DefaultDepth(xw.dpy, xw.scr));
3048         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3049         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3050
3051         /* Xft rendering context */
3052         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3053
3054         /* input methods */
3055         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3056                 XSetLocaleModifiers("@im=local");
3057                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3058                         XSetLocaleModifiers("@im=");
3059                         if((xw.xim = XOpenIM(xw.dpy,
3060                                         NULL, NULL, NULL)) == NULL) {
3061                                 die("XOpenIM failed. Could not open input"
3062                                         " device.\n");
3063                         }
3064                 }
3065         }
3066         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3067                                            | XIMStatusNothing, XNClientWindow, xw.win,
3068                                            XNFocusWindow, xw.win, NULL);
3069         if(xw.xic == NULL)
3070                 die("XCreateIC failed. Could not obtain input method.\n");
3071
3072         /* white cursor, black outline */
3073         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3074         XDefineCursor(xw.dpy, xw.win, cursor);
3075         XRecolorCursor(xw.dpy, cursor,
3076                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3077                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3078
3079         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3080         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3081         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3082         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3083
3084         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3085         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3086                         PropModeReplace, (unsigned char *)&thispid, 1);
3087
3088         xresettitle();
3089         XMapWindow(xw.dpy, xw.win);
3090         xhints();
3091         XSync(xw.dpy, False);
3092 }
3093
3094 void
3095 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3096         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3097             width = charlen * xw.cw, xp, i;
3098         int frcflags;
3099         int u8fl, u8fblen, u8cblen, doesexist;
3100         char *u8c, *u8fs;
3101         long unicodep;
3102         Font *font = &dc.font;
3103         FcResult fcres;
3104         FcPattern *fcpattern, *fontpattern;
3105         FcFontSet *fcsets[] = { NULL };
3106         FcCharSet *fccharset;
3107         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3108         XRenderColor colfg, colbg;
3109         XRectangle r;
3110         int oneatatime;
3111
3112         frcflags = FRC_NORMAL;
3113
3114         if(base.mode & ATTR_ITALIC) {
3115                 if(base.fg == defaultfg)
3116                         base.fg = defaultitalic;
3117                 font = &dc.ifont;
3118                 frcflags = FRC_ITALIC;
3119         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3120                 if(base.fg == defaultfg)
3121                         base.fg = defaultitalic;
3122                 font = &dc.ibfont;
3123                 frcflags = FRC_ITALICBOLD;
3124         } else if(base.mode & ATTR_UNDERLINE) {
3125                 if(base.fg == defaultfg)
3126                         base.fg = defaultunderline;
3127         }
3128
3129         if(IS_TRUECOL(base.fg)) {
3130                 colfg.alpha = 0xffff;
3131                 colfg.red = TRUERED(base.fg);
3132                 colfg.green = TRUEGREEN(base.fg);
3133                 colfg.blue = TRUEBLUE(base.fg);
3134                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3135                 fg = &truefg;
3136         } else {
3137                 fg = &dc.col[base.fg];
3138         }
3139
3140         if(IS_TRUECOL(base.bg)) {
3141                 colbg.alpha = 0xffff;
3142                 colbg.green = TRUEGREEN(base.bg);
3143                 colbg.red = TRUERED(base.bg);
3144                 colbg.blue = TRUEBLUE(base.bg);
3145                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3146                 bg = &truebg;
3147         } else {
3148                 bg = &dc.col[base.bg];
3149         }
3150
3151         if(base.mode & ATTR_BOLD) {
3152                 if(BETWEEN(base.fg, 0, 7)) {
3153                         /* basic system colors */
3154                         fg = &dc.col[base.fg + 8];
3155                 } else if(BETWEEN(base.fg, 16, 195)) {
3156                         /* 256 colors */
3157                         fg = &dc.col[base.fg + 36];
3158                 } else if(BETWEEN(base.fg, 232, 251)) {
3159                         /* greyscale */
3160                         fg = &dc.col[base.fg + 4];
3161                 }
3162                 /*
3163                  * Those ranges will not be brightened:
3164                  *    8 - 15 – bright system colors
3165                  *    196 - 231 – highest 256 color cube
3166                  *    252 - 255 – brightest colors in greyscale
3167                  */
3168                 font = &dc.bfont;
3169                 frcflags = FRC_BOLD;
3170         }
3171
3172         if(IS_SET(MODE_REVERSE)) {
3173                 if(fg == &dc.col[defaultfg]) {
3174                         fg = &dc.col[defaultbg];
3175                 } else {
3176                         colfg.red = ~fg->color.red;
3177                         colfg.green = ~fg->color.green;
3178                         colfg.blue = ~fg->color.blue;
3179                         colfg.alpha = fg->color.alpha;
3180                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3181                                         &revfg);
3182                         fg = &revfg;
3183                 }
3184
3185                 if(bg == &dc.col[defaultbg]) {
3186                         bg = &dc.col[defaultfg];
3187                 } else {
3188                         colbg.red = ~bg->color.red;
3189                         colbg.green = ~bg->color.green;
3190                         colbg.blue = ~bg->color.blue;
3191                         colbg.alpha = bg->color.alpha;
3192                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3193                                         &revbg);
3194                         bg = &revbg;
3195                 }
3196         }
3197
3198         if(base.mode & ATTR_REVERSE) {
3199                 temp = fg;
3200                 fg = bg;
3201                 bg = temp;
3202         }
3203
3204         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3205                 fg = bg;
3206
3207         /* Intelligent cleaning up of the borders. */
3208         if(x == 0) {
3209                 xclear(0, (y == 0)? 0 : winy, borderpx,
3210                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3211         }
3212         if(x + charlen >= term.col) {
3213                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3214                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3215         }
3216         if(y == 0)
3217                 xclear(winx, 0, winx + width, borderpx);
3218         if(y == term.row-1)
3219                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3220
3221         /* Clean up the region we want to draw to. */
3222         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3223
3224         /* Set the clip region because Xft is sometimes dirty. */
3225         r.x = 0;
3226         r.y = 0;
3227         r.height = xw.ch;
3228         r.width = width;
3229         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3230
3231         for(xp = winx; bytelen > 0;) {
3232                 /*
3233                  * Search for the range in the to be printed string of glyphs
3234                  * that are in the main font. Then print that range. If
3235                  * some glyph is found that is not in the font, do the
3236                  * fallback dance.
3237                  */
3238                 u8fs = s;
3239                 u8fblen = 0;
3240                 u8fl = 0;
3241                 oneatatime = font->width != xw.cw;
3242                 for(;;) {
3243                         u8c = s;
3244                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3245                         s += u8cblen;
3246                         bytelen -= u8cblen;
3247
3248                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3249                         if(oneatatime || !doesexist || bytelen <= 0) {
3250                                 if(oneatatime || bytelen <= 0) {
3251                                         if(doesexist) {
3252                                                 u8fl++;
3253                                                 u8fblen += u8cblen;
3254                                         }
3255                                 }
3256
3257                                 if(u8fl > 0) {
3258                                         XftDrawStringUtf8(xw.draw, fg,
3259                                                         font->match, xp,
3260                                                         winy + font->ascent,
3261                                                         (FcChar8 *)u8fs,
3262                                                         u8fblen);
3263                                         xp += xw.cw * u8fl;
3264
3265                                 }
3266                                 break;
3267                         }
3268
3269                         u8fl++;
3270                         u8fblen += u8cblen;
3271                 }
3272                 if(doesexist) {
3273                         if(oneatatime)
3274                                 continue;
3275                         break;
3276                 }
3277
3278                 /* Search the font cache. */
3279                 for(i = 0; i < frclen; i++) {
3280                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3281                                         && frc[i].flags == frcflags) {
3282                                 break;
3283                         }
3284                 }
3285
3286                 /* Nothing was found. */
3287                 if(i >= frclen) {
3288                         if(!font->set)
3289                                 xloadfontset(font);
3290                         fcsets[0] = font->set;
3291
3292                         /*
3293                          * Nothing was found in the cache. Now use
3294                          * some dozen of Fontconfig calls to get the
3295                          * font for one single character.
3296                          *
3297                          * Xft and fontconfig are design failures.
3298                          */
3299                         fcpattern = FcPatternDuplicate(font->pattern);
3300                         fccharset = FcCharSetCreate();
3301
3302                         FcCharSetAddChar(fccharset, unicodep);
3303                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3304                                         fccharset);
3305                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3306                                         FcTrue);
3307
3308                         FcConfigSubstitute(0, fcpattern,
3309                                         FcMatchPattern);
3310                         FcDefaultSubstitute(fcpattern);
3311
3312                         fontpattern = FcFontSetMatch(0, fcsets,
3313                                         FcTrue, fcpattern, &fcres);
3314
3315                         /*
3316                          * Overwrite or create the new cache entry.
3317                          */
3318                         if(frclen >= LEN(frc)) {
3319                                 frclen = LEN(frc) - 1;
3320                                 XftFontClose(xw.dpy, frc[frclen].font);
3321                         }
3322
3323                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3324                                         fontpattern);
3325                         frc[frclen].flags = frcflags;
3326
3327                         i = frclen;
3328                         frclen++;
3329
3330                         FcPatternDestroy(fcpattern);
3331                         FcCharSetDestroy(fccharset);
3332                 }
3333
3334                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3335                                 xp, winy + frc[i].font->ascent,
3336                                 (FcChar8 *)u8c, u8cblen);
3337
3338                 xp += xw.cw * wcwidth(unicodep);
3339         }
3340
3341         /*
3342          * This is how the loop above actually should be. Why does the
3343          * application have to care about font details?
3344          *
3345          * I have to repeat: Xft and Fontconfig are design failures.
3346          */
3347         /*
3348         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3349                         winy + font->ascent, (FcChar8 *)s, bytelen);
3350         */
3351
3352         if(base.mode & ATTR_UNDERLINE) {
3353                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3354                                 width, 1);
3355         }
3356
3357         /* Reset clip to none. */
3358         XftDrawSetClip(xw.draw, 0);
3359 }
3360
3361 void
3362 xdrawcursor(void) {
3363         static int oldx = 0, oldy = 0;
3364         int sl, width, curx;
3365         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3366
3367         LIMIT(oldx, 0, term.col-1);
3368         LIMIT(oldy, 0, term.row-1);
3369
3370         curx = term.c.x;
3371
3372         /* adjust position if in dummy */
3373         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3374                 oldx--;
3375         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3376                 curx--;
3377
3378         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3379
3380         /* remove the old cursor */
3381         sl = utf8len(term.line[oldy][oldx].c);
3382         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3383         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3384                         oldy, width, sl);
3385
3386         /* draw the new one */
3387         if(!(IS_SET(MODE_HIDE))) {
3388                 if(xw.state & WIN_FOCUSED) {
3389                         if(IS_SET(MODE_REVERSE)) {
3390                                 g.mode |= ATTR_REVERSE;
3391                                 g.fg = defaultcs;
3392                                 g.bg = defaultfg;
3393                         }
3394
3395                         sl = utf8len(g.c);
3396                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3397                                 ? 2 : 1;
3398                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3399                 } else {
3400                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3401                                         borderpx + curx * xw.cw,
3402                                         borderpx + term.c.y * xw.ch,
3403                                         xw.cw - 1, 1);
3404                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3405                                         borderpx + curx * xw.cw,
3406                                         borderpx + term.c.y * xw.ch,
3407                                         1, xw.ch - 1);
3408                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3409                                         borderpx + (curx + 1) * xw.cw - 1,
3410                                         borderpx + term.c.y * xw.ch,
3411                                         1, xw.ch - 1);
3412                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3413                                         borderpx + curx * xw.cw,
3414                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3415                                         xw.cw, 1);
3416                 }
3417                 oldx = curx, oldy = term.c.y;
3418         }
3419 }
3420
3421
3422 void
3423 xsettitle(char *p) {
3424         XTextProperty prop;
3425
3426         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3427                         &prop);
3428         XSetWMName(xw.dpy, xw.win, &prop);
3429         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3430         XFree(prop.value);
3431 }
3432
3433 void
3434 xresettitle(void) {
3435         xsettitle(opt_title ? opt_title : "st");
3436 }
3437
3438 void
3439 redraw(int timeout) {
3440         struct timespec tv = {0, timeout * 1000};
3441
3442         draw();
3443
3444         if(timeout > 0) {
3445                 nanosleep(&tv, NULL);
3446                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3447         }
3448 }
3449
3450 void
3451 draw(void) {
3452         drawregion(0, 0, term.col, term.row);
3453         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3454                         xw.h, 0, 0);
3455         XSetForeground(xw.dpy, dc.gc,
3456                         dc.col[IS_SET(MODE_REVERSE)?
3457                                 defaultfg : defaultbg].pixel);
3458 }
3459
3460 void
3461 drawregion(int x1, int y1, int x2, int y2) {
3462         int ic, ib, x, y, ox, sl;
3463         Glyph base, new;
3464         char buf[DRAW_BUF_SIZ];
3465         bool ena_sel = sel.ob.x != -1;
3466         long unicodep;
3467
3468         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3469                 ena_sel = 0;
3470
3471         if(!(xw.state & WIN_VISIBLE))
3472                 return;
3473
3474         for(y = y1; y < y2; y++) {
3475                 if(!term.dirty[y])
3476                         continue;
3477
3478                 xtermclear(0, y, term.col, y);
3479                 term.dirty[y] = 0;
3480                 base = term.line[y][0];
3481                 ic = ib = ox = 0;
3482                 for(x = x1; x < x2; x++) {
3483                         new = term.line[y][x];
3484                         if(new.mode == ATTR_WDUMMY)
3485                                 continue;
3486                         if(ena_sel && selected(x, y))
3487                                 new.mode ^= ATTR_REVERSE;
3488                         if(ib > 0 && (ATTRCMP(base, new)
3489                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3490                                 xdraws(buf, base, ox, y, ic, ib);
3491                                 ic = ib = 0;
3492                         }
3493                         if(ib == 0) {
3494                                 ox = x;
3495                                 base = new;
3496                         }
3497
3498                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3499                         memcpy(buf+ib, new.c, sl);
3500                         ib += sl;
3501                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3502                 }
3503                 if(ib > 0)
3504                         xdraws(buf, base, ox, y, ic, ib);
3505         }
3506         xdrawcursor();
3507 }
3508
3509 void
3510 expose(XEvent *ev) {
3511         XExposeEvent *e = &ev->xexpose;
3512
3513         if(xw.state & WIN_REDRAW) {
3514                 if(!e->count)
3515                         xw.state &= ~WIN_REDRAW;
3516         }
3517         redraw(0);
3518 }
3519
3520 void
3521 visibility(XEvent *ev) {
3522         XVisibilityEvent *e = &ev->xvisibility;
3523
3524         if(e->state == VisibilityFullyObscured) {
3525                 xw.state &= ~WIN_VISIBLE;
3526         } else if(!(xw.state & WIN_VISIBLE)) {
3527                 /* need a full redraw for next Expose, not just a buf copy */
3528                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3529         }
3530 }
3531
3532 void
3533 unmap(XEvent *ev) {
3534         xw.state &= ~WIN_VISIBLE;
3535 }
3536
3537 void
3538 xsetpointermotion(int set) {
3539         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3540         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3541 }
3542
3543 void
3544 xseturgency(int add) {
3545         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3546
3547         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3548         XSetWMHints(xw.dpy, xw.win, h);
3549         XFree(h);
3550 }
3551
3552 void
3553 focus(XEvent *ev) {
3554         XFocusChangeEvent *e = &ev->xfocus;
3555
3556         if(e->mode == NotifyGrab)
3557                 return;
3558
3559         if(ev->type == FocusIn) {
3560                 XSetICFocus(xw.xic);
3561                 xw.state |= WIN_FOCUSED;
3562                 xseturgency(0);
3563                 if(IS_SET(MODE_FOCUS))
3564                         ttywrite("\033[I", 3);
3565         } else {
3566                 XUnsetICFocus(xw.xic);
3567                 xw.state &= ~WIN_FOCUSED;
3568                 if(IS_SET(MODE_FOCUS))
3569                         ttywrite("\033[O", 3);
3570         }
3571 }
3572
3573 static inline bool
3574 match(uint mask, uint state) {
3575         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3576 }
3577
3578 void
3579 numlock(const Arg *dummy) {
3580         term.numlock ^= 1;
3581 }
3582
3583 char*
3584 kmap(KeySym k, uint state) {
3585         Key *kp;
3586         int i;
3587
3588         /* Check for mapped keys out of X11 function keys. */
3589         for(i = 0; i < LEN(mappedkeys); i++) {
3590                 if(mappedkeys[i] == k)
3591                         break;
3592         }
3593         if(i == LEN(mappedkeys)) {
3594                 if((k & 0xFFFF) < 0xFD00)
3595                         return NULL;
3596         }
3597
3598         for(kp = key; kp < key + LEN(key); kp++) {
3599                 if(kp->k != k)
3600                         continue;
3601
3602                 if(!match(kp->mask, state))
3603                         continue;
3604
3605                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3606                         continue;
3607                 if(term.numlock && kp->appkey == 2)
3608                         continue;
3609
3610                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3611                         continue;
3612
3613                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3614                         continue;
3615
3616                 return kp->s;
3617         }
3618
3619         return NULL;
3620 }
3621
3622 void
3623 kpress(XEvent *ev) {
3624         XKeyEvent *e = &ev->xkey;
3625         KeySym ksym;
3626         char buf[32], *customkey;
3627         int len;
3628         long c;
3629         Status status;
3630         Shortcut *bp;
3631
3632         if(IS_SET(MODE_KBDLOCK))
3633                 return;
3634
3635         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3636         /* 1. shortcuts */
3637         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3638                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3639                         bp->func(&(bp->arg));
3640                         return;
3641                 }
3642         }
3643
3644         /* 2. custom keys from config.h */
3645         if((customkey = kmap(ksym, e->state))) {
3646                 ttysend(customkey, strlen(customkey));
3647                 return;
3648         }
3649
3650         /* 3. composed string from input method */
3651         if(len == 0)
3652                 return;
3653         if(len == 1 && e->state & Mod1Mask) {
3654                 if(IS_SET(MODE_8BIT)) {
3655                         if(*buf < 0177) {
3656                                 c = *buf | 0x80;
3657                                 len = utf8encode(c, buf, UTF_SIZ);
3658                         }
3659                 } else {
3660                         buf[1] = buf[0];
3661                         buf[0] = '\033';
3662                         len = 2;
3663                 }
3664         }
3665         ttysend(buf, len);
3666 }
3667
3668
3669 void
3670 cmessage(XEvent *e) {
3671         /*
3672          * See xembed specs
3673          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3674          */
3675         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3676                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3677                         xw.state |= WIN_FOCUSED;
3678                         xseturgency(0);
3679                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3680                         xw.state &= ~WIN_FOCUSED;
3681                 }
3682         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3683                 /* Send SIGHUP to shell */
3684                 kill(pid, SIGHUP);
3685                 exit(EXIT_SUCCESS);
3686         }
3687 }
3688
3689 void
3690 cresize(int width, int height) {
3691         int col, row;
3692
3693         if(width != 0)
3694                 xw.w = width;
3695         if(height != 0)
3696                 xw.h = height;
3697
3698         col = (xw.w - 2 * borderpx) / xw.cw;
3699         row = (xw.h - 2 * borderpx) / xw.ch;
3700
3701         tresize(col, row);
3702         xresize(col, row);
3703         ttyresize();
3704 }
3705
3706 void
3707 resize(XEvent *e) {
3708         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3709                 return;
3710
3711         cresize(e->xconfigure.width, e->xconfigure.height);
3712 }
3713
3714 void
3715 run(void) {
3716         XEvent ev;
3717         int w = xw.w, h = xw.h;
3718         fd_set rfd;
3719         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3720         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3721
3722         /* Waiting for window mapping */
3723         while(1) {
3724                 XNextEvent(xw.dpy, &ev);
3725                 if(ev.type == ConfigureNotify) {
3726                         w = ev.xconfigure.width;
3727                         h = ev.xconfigure.height;
3728                 } else if(ev.type == MapNotify) {
3729                         break;
3730                 }
3731         }
3732
3733         ttynew();
3734         if(!xw.isfixed)
3735                 cresize(w, h);
3736         else
3737                 cresize(xw.fw, xw.fh);
3738
3739         gettimeofday(&last, NULL);
3740         lastblink = last;
3741
3742         for(xev = actionfps;;) {
3743                 long deltatime;
3744
3745                 FD_ZERO(&rfd);
3746                 FD_SET(cmdfd, &rfd);
3747                 FD_SET(xfd, &rfd);
3748
3749                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3750                         if(errno == EINTR)
3751                                 continue;
3752                         die("select failed: %s\n", strerror(errno));
3753                 }
3754                 if(FD_ISSET(cmdfd, &rfd)) {
3755                         ttyread();
3756                         if(blinktimeout) {
3757                                 blinkset = tattrset(ATTR_BLINK);
3758                                 if(!blinkset)
3759                                         MODBIT(term.mode, 0, MODE_BLINK);
3760                         }
3761                 }
3762
3763                 if(FD_ISSET(xfd, &rfd))
3764                         xev = actionfps;
3765
3766                 gettimeofday(&now, NULL);
3767                 drawtimeout.tv_sec = 0;
3768                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3769                 tv = &drawtimeout;
3770
3771                 dodraw = 0;
3772                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3773                         tsetdirtattr(ATTR_BLINK);
3774                         term.mode ^= MODE_BLINK;
3775                         lastblink = now;
3776                         dodraw = 1;
3777                 }
3778                 deltatime = TIMEDIFF(now, last);
3779                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3780                                 || deltatime < 0) {
3781                         dodraw = 1;
3782                         last = now;
3783                 }
3784
3785                 if(dodraw) {
3786                         while(XPending(xw.dpy)) {
3787                                 XNextEvent(xw.dpy, &ev);
3788                                 if(XFilterEvent(&ev, None))
3789                                         continue;
3790                                 if(handler[ev.type])
3791                                         (handler[ev.type])(&ev);
3792                         }
3793
3794                         draw();
3795                         XFlush(xw.dpy);
3796
3797                         if(xev && !FD_ISSET(xfd, &rfd))
3798                                 xev--;
3799                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3800                                 if(blinkset) {
3801                                         if(TIMEDIFF(now, lastblink) \
3802                                                         > blinktimeout) {
3803                                                 drawtimeout.tv_usec = 1;
3804                                         } else {
3805                                                 drawtimeout.tv_usec = (1000 * \
3806                                                         (blinktimeout - \
3807                                                         TIMEDIFF(now,
3808                                                                 lastblink)));
3809                                         }
3810                                 } else {
3811                                         tv = NULL;
3812                                 }
3813                         }
3814                 }
3815         }
3816 }
3817
3818 void
3819 usage(void) {
3820         die("%s " VERSION " (c) 2010-2013 st engineers\n" \
3821         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3822         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3823 }
3824
3825 int
3826 main(int argc, char *argv[]) {
3827         int bitm, xr, yr;
3828         uint wr, hr;
3829         char *titles;
3830
3831         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3832         xw.isfixed = False;
3833
3834         ARGBEGIN {
3835         case 'a':
3836                 allowaltscreen = false;
3837                 break;
3838         case 'c':
3839                 opt_class = EARGF(usage());
3840                 break;
3841         case 'e':
3842                 /* eat all remaining arguments */
3843                 if(argc > 1) {
3844                         opt_cmd = &argv[1];
3845                         if(argv[1] != NULL && opt_title == NULL) {
3846                                 titles = xstrdup(argv[1]);
3847                                 opt_title = basename(titles);
3848                         }
3849                 }
3850                 goto run;
3851         case 'f':
3852                 opt_font = EARGF(usage());
3853                 break;
3854         case 'g':
3855                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3856                 if(bitm & XValue)
3857                         xw.fx = xr;
3858                 if(bitm & YValue)
3859                         xw.fy = yr;
3860                 if(bitm & WidthValue)
3861                         xw.fw = (int)wr;
3862                 if(bitm & HeightValue)
3863                         xw.fh = (int)hr;
3864                 if(bitm & XNegative && xw.fx == 0)
3865                         xw.fx = -1;
3866                 if(bitm & YNegative && xw.fy == 0)
3867                         xw.fy = -1;
3868
3869                 if(xw.fh != 0 && xw.fw != 0)
3870                         xw.isfixed = True;
3871                 break;
3872         case 'o':
3873                 opt_io = EARGF(usage());
3874                 break;
3875         case 't':
3876                 opt_title = EARGF(usage());
3877                 break;
3878         case 'w':
3879                 opt_embed = EARGF(usage());
3880                 break;
3881         case 'v':
3882         default:
3883                 usage();
3884         } ARGEND;
3885
3886 run:
3887         setlocale(LC_CTYPE, "");
3888         XSetLocaleModifiers("");
3889         tnew(80, 24);
3890         xinit();
3891         selinit();
3892         run();
3893
3894         return 0;
3895 }
3896