st.c

   1 /* See LICENSE for license 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 <X11/XKBlib.h>
  31 #include <fontconfig/fontconfig.h>
  32 #include <wchar.h>
  33
  34 #include "arg.h"
  35
  36 char *argv0;
  37
  38 #define Glyph Glyph_
  39 #define Font Font_
  40
  41 #if   defined(__linux)
  42  #include <pty.h>
  43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  44  #include <util.h>
  45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  46  #include <libutil.h>
  47 #endif
  48
  49
  50 /* XEMBED messages */
  51 #define XEMBED_FOCUS_IN  4
  52 #define XEMBED_FOCUS_OUT 5
  53
  54 /* Arbitrary sizes */
  55 #define UTF_INVALID   0xFFFD
  56 #define UTF_SIZ       4
  57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  58 #define ESC_ARG_SIZ   16
  59 #define STR_BUF_SIZ   ESC_BUF_SIZ
  60 #define STR_ARG_SIZ   ESC_ARG_SIZ
  61 #define DRAW_BUF_SIZ  20*1024
  62 #define XK_ANY_MOD    UINT_MAX
  63 #define XK_NO_MOD     0
  64 #define XK_SWITCH_MOD (1<<13)
  65
  66 /* macros */
  67 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  68 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  69 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  70 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  71 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  72 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  73 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  74 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  75 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  76 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  77 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  78 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  79 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  80
  81 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  82 #define IS_TRUECOL(x)    (1 << 24 & (x))
  83 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  84 #define TRUEGREEN(x)     (((x) & 0xff00))
  85 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  86
  87
  88 enum glyph_attribute {
  89         ATTR_NULL      = 0,
  90         ATTR_BOLD      = 1 << 0,
  91         ATTR_FAINT     = 1 << 1,
  92         ATTR_ITALIC    = 1 << 2,
  93         ATTR_UNDERLINE = 1 << 3,
  94         ATTR_BLINK     = 1 << 4,
  95         ATTR_REVERSE   = 1 << 5,
  96         ATTR_INVISIBLE = 1 << 6,
  97         ATTR_STRUCK    = 1 << 7,
  98         ATTR_WRAP      = 1 << 8,
  99         ATTR_WIDE      = 1 << 9,
 100         ATTR_WDUMMY    = 1 << 10,
 101 };
 102
 103 enum cursor_movement {
 104         CURSOR_SAVE,
 105         CURSOR_LOAD
 106 };
 107
 108 enum cursor_state {
 109         CURSOR_DEFAULT  = 0,
 110         CURSOR_WRAPNEXT = 1,
 111         CURSOR_ORIGIN   = 2
 112 };
 113
 114 enum term_mode {
 115         MODE_WRAP        = 1 << 0,
 116         MODE_INSERT      = 1 << 1,
 117         MODE_APPKEYPAD   = 1 << 2,
 118         MODE_ALTSCREEN   = 1 << 3,
 119         MODE_CRLF        = 1 << 4,
 120         MODE_MOUSEBTN    = 1 << 5,
 121         MODE_MOUSEMOTION = 1 << 6,
 122         MODE_REVERSE     = 1 << 7,
 123         MODE_KBDLOCK     = 1 << 8,
 124         MODE_HIDE        = 1 << 9,
 125         MODE_ECHO        = 1 << 10,
 126         MODE_APPCURSOR   = 1 << 11,
 127         MODE_MOUSESGR    = 1 << 12,
 128         MODE_8BIT        = 1 << 13,
 129         MODE_BLINK       = 1 << 14,
 130         MODE_FBLINK      = 1 << 15,
 131         MODE_FOCUS       = 1 << 16,
 132         MODE_MOUSEX10    = 1 << 17,
 133         MODE_MOUSEMANY   = 1 << 18,
 134         MODE_BRCKTPASTE  = 1 << 19,
 135         MODE_PRINT       = 1 << 20,
 136         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 137                           |MODE_MOUSEMANY,
 138 };
 139
 140 enum charset {
 141         CS_GRAPHIC0,
 142         CS_GRAPHIC1,
 143         CS_UK,
 144         CS_USA,
 145         CS_MULTI,
 146         CS_GER,
 147         CS_FIN
 148 };
 149
 150 enum escape_state {
 151         ESC_START      = 1,
 152         ESC_CSI        = 2,
 153         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 154         ESC_ALTCHARSET = 8,
 155         ESC_STR_END    = 16, /* a final string was encountered */
 156         ESC_TEST       = 32, /* Enter in test mode */
 157 };
 158
 159 enum window_state {
 160         WIN_VISIBLE = 1,
 161         WIN_REDRAW  = 2,
 162         WIN_FOCUSED = 4
 163 };
 164
 165 enum selection_type {
 166         SEL_REGULAR = 1,
 167         SEL_RECTANGULAR = 2
 168 };
 169
 170 enum selection_snap {
 171         SNAP_WORD = 1,
 172         SNAP_LINE = 2
 173 };
 174
 175 typedef unsigned char uchar;
 176 typedef unsigned int uint;
 177 typedef unsigned long ulong;
 178 typedef unsigned short ushort;
 179
 180 typedef XftDraw *Draw;
 181 typedef XftColor Color;
 182
 183 typedef struct {
 184         char c[UTF_SIZ]; /* character code */
 185         ushort mode;      /* attribute flags */
 186         uint32_t fg;      /* foreground  */
 187         uint32_t bg;      /* background  */
 188 } Glyph;
 189
 190 typedef Glyph *Line;
 191
 192 typedef struct {
 193         Glyph attr; /* current char attributes */
 194         int x;
 195         int y;
 196         char state;
 197 } TCursor;
 198
 199 /* CSI Escape sequence structs */
 200 /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
 201 typedef struct {
 202         char buf[ESC_BUF_SIZ]; /* raw string */
 203         int len;               /* raw string length */
 204         char priv;
 205         int arg[ESC_ARG_SIZ];
 206         int narg;              /* nb of args */
 207         char mode[2];
 208 } CSIEscape;
 209
 210 /* STR Escape sequence structs */
 211 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 212 typedef struct {
 213         char type;             /* ESC type ... */
 214         char buf[STR_BUF_SIZ]; /* raw string */
 215         int len;               /* raw string length */
 216         char *args[STR_ARG_SIZ];
 217         int narg;              /* nb of args */
 218 } STREscape;
 219
 220 /* Internal representation of the screen */
 221 typedef struct {
 222         int row;      /* nb row */
 223         int col;      /* nb col */
 224         Line *line;   /* screen */
 225         Line *alt;    /* alternate screen */
 226         bool *dirty;  /* dirtyness of lines */
 227         TCursor c;    /* cursor */
 228         int top;      /* top    scroll limit */
 229         int bot;      /* bottom scroll limit */
 230         int mode;     /* terminal mode flags */
 231         int esc;      /* escape state flags */
 232         char trantbl[4]; /* charset table translation */
 233         int charset;  /* current charset */
 234         int icharset; /* selected charset for sequence */
 235         bool numlock; /* lock numbers in keyboard */
 236         bool *tabs;
 237 } Term;
 238
 239 /* Purely graphic info */
 240 typedef struct {
 241         Display *dpy;
 242         Colormap cmap;
 243         Window win;
 244         Drawable buf;
 245         Atom xembed, wmdeletewin, netwmname, netwmpid;
 246         XIM xim;
 247         XIC xic;
 248         Draw draw;
 249         Visual *vis;
 250         XSetWindowAttributes attrs;
 251         int scr;
 252         bool isfixed; /* is fixed geometry? */
 253         int l, t; /* left and top offset */
 254         int gm; /* geometry mask */
 255         int tw, th; /* tty width and height */
 256         int w, h; /* window width and height */
 257         int ch; /* char height */
 258         int cw; /* char width  */
 259         char state; /* focus, redraw, visible */
 260         int cursor; /* cursor style */
 261 } XWindow;
 262
 263 typedef struct {
 264         uint b;
 265         uint mask;
 266         char *s;
 267 } Mousekey;
 268
 269 typedef struct {
 270         KeySym k;
 271         uint mask;
 272         char *s;
 273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 274         signed char appkey;    /* application keypad */
 275         signed char appcursor; /* application cursor */
 276         signed char crlf;      /* crlf mode          */
 277 } Key;
 278
 279 typedef struct {
 280         int mode;
 281         int type;
 282         int snap;
 283         /*
 284          * Selection variables:
 285          * nb – normalized coordinates of the beginning of the selection
 286          * ne – normalized coordinates of the end of the selection
 287          * ob – original coordinates of the beginning of the selection
 288          * oe – original coordinates of the end of the selection
 289          */
 290         struct {
 291                 int x, y;
 292         } nb, ne, ob, oe;
 293
 294         char *primary, *clipboard;
 295         Atom xtarget;
 296         bool alt;
 297         struct timespec tclick1;
 298         struct timespec tclick2;
 299 } Selection;
 300
 301 typedef union {
 302         int i;
 303         uint ui;
 304         float f;
 305         const void *v;
 306 } Arg;
 307
 308 typedef struct {
 309         uint mod;
 310         KeySym keysym;
 311         void (*func)(const Arg *);
 312         const Arg arg;
 313 } Shortcut;
 314
 315 /* function definitions used in config.h */
 316 static void clipcopy(const Arg *);
 317 static void clippaste(const Arg *);
 318 static void numlock(const Arg *);
 319 static void selpaste(const Arg *);
 320 static void xzoom(const Arg *);
 321 static void xzoomabs(const Arg *);
 322 static void xzoomreset(const Arg *);
 323 static void printsel(const Arg *);
 324 static void printscreen(const Arg *) ;
 325 static void toggleprinter(const Arg *);
 326
 327 /* Config.h for applying patches and the configuration. */
 328 #include "config.h"
 329
 330 /* Font structure */
 331 typedef struct {
 332         int height;
 333         int width;
 334         int ascent;
 335         int descent;
 336         short lbearing;
 337         short rbearing;
 338         XftFont *match;
 339         FcFontSet *set;
 340         FcPattern *pattern;
 341 } Font;
 342
 343 /* Drawing Context */
 344 typedef struct {
 345         Color col[MAX(LEN(colorname), 256)];
 346         Font font, bfont, ifont, ibfont;
 347         GC gc;
 348 } DC;
 349
 350 static void die(const char *, ...);
 351 static void draw(void);
 352 static void redraw(void);
 353 static void drawregion(int, int, int, int);
 354 static void execsh(void);
 355 static void sigchld(int);
 356 static void run(void);
 357
 358 static void csidump(void);
 359 static void csihandle(void);
 360 static void csiparse(void);
 361 static void csireset(void);
 362 static int eschandle(uchar);
 363 static void strdump(void);
 364 static void strhandle(void);
 365 static void strparse(void);
 366 static void strreset(void);
 367
 368 static int tattrset(int);
 369 static void tprinter(char *, size_t);
 370 static void tdumpsel(void);
 371 static void tdumpline(int);
 372 static void tdump(void);
 373 static void tclearregion(int, int, int, int);
 374 static void tcursor(int);
 375 static void tdeletechar(int);
 376 static void tdeleteline(int);
 377 static void tinsertblank(int);
 378 static void tinsertblankline(int);
 379 static int tlinelen(int);
 380 static void tmoveto(int, int);
 381 static void tmoveato(int, int);
 382 static void tnew(int, int);
 383 static void tnewline(int);
 384 static void tputtab(int);
 385 static void tputc(char *, int);
 386 static void treset(void);
 387 static void tresize(int, int);
 388 static void tscrollup(int, int);
 389 static void tscrolldown(int, int);
 390 static void tsetattr(int *, int);
 391 static void tsetchar(char *, Glyph *, int, int);
 392 static void tsetscroll(int, int);
 393 static void tswapscreen(void);
 394 static void tsetdirt(int, int);
 395 static void tsetdirtattr(int);
 396 static void tsetmode(bool, bool, int *, int);
 397 static void tfulldirt(void);
 398 static void techo(char *, int);
 399 static void tcontrolcode(uchar );
 400 static void tdectest(char );
 401 static int32_t tdefcolor(int *, int *, int);
 402 static void tdeftran(char);
 403 static inline bool match(uint, uint);
 404 static void ttynew(void);
 405 static void ttyread(void);
 406 static void ttyresize(void);
 407 static void ttysend(char *, size_t);
 408 static void ttywrite(const char *, size_t);
 409 static void tstrsequence(uchar);
 410
 411 static inline ushort sixd_to_16bit(int);
 412 static void xdraws(char *, Glyph, int, int, int, int);
 413 static void xhints(void);
 414 static void xclear(int, int, int, int);
 415 static void xdrawcursor(void);
 416 static void xinit(void);
 417 static void xloadcols(void);
 418 static int xsetcolorname(int, const char *);
 419 static int xgeommasktogravity(int);
 420 static int xloadfont(Font *, FcPattern *);
 421 static void xloadfonts(char *, double);
 422 static void xsettitle(char *);
 423 static void xresettitle(void);
 424 static void xsetpointermotion(int);
 425 static void xseturgency(int);
 426 static void xsetsel(char *, Time);
 427 static void xtermclear(int, int, int, int);
 428 static void xunloadfont(Font *);
 429 static void xunloadfonts(void);
 430 static void xresize(int, int);
 431
 432 static void expose(XEvent *);
 433 static void visibility(XEvent *);
 434 static void unmap(XEvent *);
 435 static char *kmap(KeySym, uint);
 436 static void kpress(XEvent *);
 437 static void cmessage(XEvent *);
 438 static void cresize(int, int);
 439 static void resize(XEvent *);
 440 static void focus(XEvent *);
 441 static void brelease(XEvent *);
 442 static void bpress(XEvent *);
 443 static void bmotion(XEvent *);
 444 static void selnotify(XEvent *);
 445 static void selclear(XEvent *);
 446 static void selrequest(XEvent *);
 447
 448 static void selinit(void);
 449 static void selnormalize(void);
 450 static inline bool selected(int, int);
 451 static char *getsel(void);
 452 static void selcopy(Time);
 453 static void selscroll(int, int);
 454 static void selsnap(int, int *, int *, int);
 455 static int x2col(int);
 456 static int y2row(int);
 457 static void getbuttoninfo(XEvent *);
 458 static void mousereport(XEvent *);
 459
 460 static size_t utf8decode(char *, long *, size_t);
 461 static long utf8decodebyte(char, size_t *);
 462 static size_t utf8encode(long, char *, size_t);
 463 static char utf8encodebyte(long, size_t);
 464 static size_t utf8len(char *);
 465 static size_t utf8validate(long *, size_t);
 466
 467 static ssize_t xwrite(int, const char *, size_t);
 468 static void *xmalloc(size_t);
 469 static void *xrealloc(void *, size_t);
 470 static char *xstrdup(char *);
 471
 472 static void usage(void);
 473
 474 static void (*handler[LASTEvent])(XEvent *) = {
 475         [KeyPress] = kpress,
 476         [ClientMessage] = cmessage,
 477         [ConfigureNotify] = resize,
 478         [VisibilityNotify] = visibility,
 479         [UnmapNotify] = unmap,
 480         [Expose] = expose,
 481         [FocusIn] = focus,
 482         [FocusOut] = focus,
 483         [MotionNotify] = bmotion,
 484         [ButtonPress] = bpress,
 485         [ButtonRelease] = brelease,
 486 /*
 487  * Uncomment if you want the selection to disappear when you select something
 488  * different in another window.
 489  */
 490 /*      [SelectionClear] = selclear, */
 491         [SelectionNotify] = selnotify,
 492         [SelectionRequest] = selrequest,
 493 };
 494
 495 /* Globals */
 496 static DC dc;
 497 static XWindow xw;
 498 static Term term;
 499 static CSIEscape csiescseq;
 500 static STREscape strescseq;
 501 static int cmdfd;
 502 static pid_t pid;
 503 static Selection sel;
 504 static int iofd = STDOUT_FILENO;
 505 static char **opt_cmd = NULL;
 506 static char *opt_io = NULL;
 507 static char *opt_title = NULL;
 508 static char *opt_embed = NULL;
 509 static char *opt_class = NULL;
 510 static char *opt_font = NULL;
 511 static int oldbutton = 3; /* button event on startup: 3 = release */
 512
 513 static char *usedfont = NULL;
 514 static double usedfontsize = 0;
 515 static double defaultfontsize = 0;
 516
 517 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 518 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 519 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 520 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 521
 522 /* Font Ring Cache */
 523 enum {
 524         FRC_NORMAL,
 525         FRC_ITALIC,
 526         FRC_BOLD,
 527         FRC_ITALICBOLD
 528 };
 529
 530 typedef struct {
 531         XftFont *font;
 532         int flags;
 533         long unicodep;
 534 } Fontcache;
 535
 536 /* Fontcache is an array now. A new font will be appended to the array. */
 537 static Fontcache frc[16];
 538 static int frclen = 0;
 539
 540 ssize_t
 541 xwrite(int fd, const char *s, size_t len) {
 542         size_t aux = len;
 543
 544         while(len > 0) {
 545                 ssize_t r = write(fd, s, len);
 546                 if(r < 0)
 547                         return r;
 548                 len -= r;
 549                 s += r;
 550         }
 551         return aux;
 552 }
 553
 554 void *
 555 xmalloc(size_t len) {
 556         void *p = malloc(len);
 557
 558         if(!p)
 559                 die("Out of memory\n");
 560
 561         return p;
 562 }
 563
 564 void *
 565 xrealloc(void *p, size_t len) {
 566         if((p = realloc(p, len)) == NULL)
 567                 die("Out of memory\n");
 568
 569         return p;
 570 }
 571
 572 char *
 573 xstrdup(char *s) {
 574         if((s = strdup(s)) == NULL)
 575                 die("Out of memory\n");
 576
 577         return s;
 578 }
 579
 580 size_t
 581 utf8decode(char *c, long *u, size_t clen) {
 582         size_t i, j, len, type;
 583         long udecoded;
 584
 585         *u = UTF_INVALID;
 586         if(!clen)
 587                 return 0;
 588         udecoded = utf8decodebyte(c[0], &len);
 589         if(!BETWEEN(len, 1, UTF_SIZ))
 590                 return 1;
 591         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 592                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 593                 if(type != 0)
 594                         return j;
 595         }
 596         if(j < len)
 597                 return 0;
 598         *u = udecoded;
 599         utf8validate(u, len);
 600         return len;
 601 }
 602
 603 long
 604 utf8decodebyte(char c, size_t *i) {
 605         for(*i = 0; *i < LEN(utfmask); ++(*i))
 606                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 607                         return (uchar)c & ~utfmask[*i];
 608         return 0;
 609 }
 610
 611 size_t
 612 utf8encode(long u, char *c, size_t clen) {
 613         size_t len, i;
 614
 615         len = utf8validate(&u, 0);
 616         if(clen < len)
 617                 return 0;
 618         for(i = len - 1; i != 0; --i) {
 619                 c[i] = utf8encodebyte(u, 0);
 620                 u >>= 6;
 621         }
 622         c[0] = utf8encodebyte(u, len);
 623         return len;
 624 }
 625
 626 char
 627 utf8encodebyte(long u, size_t i) {
 628         return utfbyte[i] | (u & ~utfmask[i]);
 629 }
 630
 631 size_t
 632 utf8len(char *c) {
 633         return utf8decode(c, &(long){0}, UTF_SIZ);
 634 }
 635
 636 size_t
 637 utf8validate(long *u, size_t i) {
 638         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 639                 *u = UTF_INVALID;
 640         for(i = 1; *u > utfmax[i]; ++i)
 641                 ;
 642         return i;
 643 }
 644
 645 void
 646 selinit(void) {
 647         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 648         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 649         sel.mode = 0;
 650         sel.ob.x = -1;
 651         sel.primary = NULL;
 652         sel.clipboard = NULL;
 653         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 654         if(sel.xtarget == None)
 655                 sel.xtarget = XA_STRING;
 656 }
 657
 658 int
 659 x2col(int x) {
 660         x -= borderpx;
 661         x /= xw.cw;
 662
 663         return LIMIT(x, 0, term.col-1);
 664 }
 665
 666 int
 667 y2row(int y) {
 668         y -= borderpx;
 669         y /= xw.ch;
 670
 671         return LIMIT(y, 0, term.row-1);
 672 }
 673
 674 int tlinelen(int y) {
 675         int i = term.col;
 676
 677         if(term.line[y][i - 1].mode & ATTR_WRAP)
 678                 return i;
 679
 680         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
 681                 --i;
 682
 683         return i;
 684 }
 685
 686 void
 687 selnormalize(void) {
 688         int i;
 689
 690         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 691                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 692                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 693         } else {
 694                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 695                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 696         }
 697         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 698         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 699
 700         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
 701         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
 702
 703         /* expand selection over line breaks */
 704         if (sel.type == SEL_RECTANGULAR)
 705                 return;
 706         i = tlinelen(sel.nb.y);
 707         if (i < sel.nb.x)
 708                 sel.nb.x = i;
 709         if (tlinelen(sel.ne.y) <= sel.ne.x)
 710                 sel.ne.x = term.col - 1;
 711 }
 712
 713 bool
 714 selected(int x, int y) {
 715         if(sel.type == SEL_RECTANGULAR)
 716                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 717                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 718
 719         return BETWEEN(y, sel.nb.y, sel.ne.y)
 720             && (y != sel.nb.y || x >= sel.nb.x)
 721             && (y != sel.ne.y || x <= sel.ne.x);
 722 }
 723
 724 void
 725 selsnap(int mode, int *x, int *y, int direction) {
 726         int newx, newy, xt, yt;
 727         bool delim, prevdelim;
 728         Glyph *gp, *prevgp;
 729
 730         switch(mode) {
 731         case SNAP_WORD:
 732                 /*
 733                  * Snap around if the word wraps around at the end or
 734                  * beginning of a line.
 735                  */
 736                 prevgp = &term.line[*y][*x];
 737                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
 738                 for(;;) {
 739                         newx = *x + direction;
 740                         newy = *y;
 741                         if(!BETWEEN(newx, 0, term.col - 1)) {
 742                                 newy += direction;
 743                                 newx = (newx + term.col) % term.col;
 744                                 if (!BETWEEN(newy, 0, term.row - 1))
 745                                         break;
 746
 747                                 if(direction > 0)
 748                                         yt = *y, xt = *x;
 749                                 else
 750                                         yt = newy, xt = newx;
 751                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 752                                         break;
 753                         }
 754
 755                         if (newx >= tlinelen(newy))
 756                                 break;
 757
 758                         gp = &term.line[newy][newx];
 759                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
 760                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 761                                         || (delim && gp->c[0] != prevgp->c[0])))
 762                                 break;
 763
 764                         *x = newx;
 765                         *y = newy;
 766                         prevgp = gp;
 767                         prevdelim = delim;
 768                 }
 769                 break;
 770         case SNAP_LINE:
 771                 /*
 772                  * Snap around if the the previous line or the current one
 773                  * has set ATTR_WRAP at its end. Then the whole next or
 774                  * previous line will be selected.
 775                  */
 776                 *x = (direction < 0) ? 0 : term.col - 1;
 777                 if(direction < 0 && *y > 0) {
 778                         for(; *y > 0; *y += direction) {
 779                                 if(!(term.line[*y-1][term.col-1].mode
 780                                                 & ATTR_WRAP)) {
 781                                         break;
 782                                 }
 783                         }
 784                 } else if(direction > 0 && *y < term.row-1) {
 785                         for(; *y < term.row; *y += direction) {
 786                                 if(!(term.line[*y][term.col-1].mode
 787                                                 & ATTR_WRAP)) {
 788                                         break;
 789                                 }
 790                         }
 791                 }
 792                 break;
 793         }
 794 }
 795
 796 void
 797 getbuttoninfo(XEvent *e) {
 798         int type;
 799         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 800
 801         sel.alt = IS_SET(MODE_ALTSCREEN);
 802
 803         sel.oe.x = x2col(e->xbutton.x);
 804         sel.oe.y = y2row(e->xbutton.y);
 805         selnormalize();
 806
 807         sel.type = SEL_REGULAR;
 808         for(type = 1; type < LEN(selmasks); ++type) {
 809                 if(match(selmasks[type], state)) {
 810                         sel.type = type;
 811                         break;
 812                 }
 813         }
 814 }
 815
 816 void
 817 mousereport(XEvent *e) {
 818         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 819             button = e->xbutton.button, state = e->xbutton.state,
 820             len;
 821         char buf[40];
 822         static int ox, oy;
 823
 824         /* from urxvt */
 825         if(e->xbutton.type == MotionNotify) {
 826                 if(x == ox && y == oy)
 827                         return;
 828                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 829                         return;
 830                 /* MOUSE_MOTION: no reporting if no button is pressed */
 831                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 832                         return;
 833
 834                 button = oldbutton + 32;
 835                 ox = x;
 836                 oy = y;
 837         } else {
 838                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 839                         button = 3;
 840                 } else {
 841                         button -= Button1;
 842                         if(button >= 3)
 843                                 button += 64 - 3;
 844                 }
 845                 if(e->xbutton.type == ButtonPress) {
 846                         oldbutton = button;
 847                         ox = x;
 848                         oy = y;
 849                 } else if(e->xbutton.type == ButtonRelease) {
 850                         oldbutton = 3;
 851                         /* MODE_MOUSEX10: no button release reporting */
 852                         if(IS_SET(MODE_MOUSEX10))
 853                                 return;
 854                         if (button == 64 || button == 65)
 855                                 return;
 856                 }
 857         }
 858
 859         if(!IS_SET(MODE_MOUSEX10)) {
 860                 button += (state & ShiftMask   ? 4  : 0)
 861                         + (state & Mod4Mask    ? 8  : 0)
 862                         + (state & ControlMask ? 16 : 0);
 863         }
 864
 865         len = 0;
 866         if(IS_SET(MODE_MOUSESGR)) {
 867                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 868                                 button, x+1, y+1,
 869                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 870         } else if(x < 223 && y < 223) {
 871                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 872                                 32+button, 32+x+1, 32+y+1);
 873         } else {
 874                 return;
 875         }
 876
 877         ttywrite(buf, len);
 878 }
 879
 880 void
 881 bpress(XEvent *e) {
 882         struct timespec now;
 883         Mousekey *mk;
 884
 885         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 886                 mousereport(e);
 887                 return;
 888         }
 889
 890         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 891                 if(e->xbutton.button == mk->b
 892                                 && match(mk->mask, e->xbutton.state)) {
 893                         ttysend(mk->s, strlen(mk->s));
 894                         return;
 895                 }
 896         }
 897
 898         if(e->xbutton.button == Button1) {
 899                 clock_gettime(CLOCK_MONOTONIC, &now);
 900
 901                 /* Clear previous selection, logically and visually. */
 902                 selclear(NULL);
 903                 sel.mode = 1;
 904                 sel.type = SEL_REGULAR;
 905                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 906                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 907
 908                 /*
 909                  * If the user clicks below predefined timeouts specific
 910                  * snapping behaviour is exposed.
 911                  */
 912                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 913                         sel.snap = SNAP_LINE;
 914                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 915                         sel.snap = SNAP_WORD;
 916                 } else {
 917                         sel.snap = 0;
 918                 }
 919                 selnormalize();
 920
 921                 /*
 922                  * Draw selection, unless it's regular and we don't want to
 923                  * make clicks visible
 924                  */
 925                 if(sel.snap != 0) {
 926                         sel.mode++;
 927                         tsetdirt(sel.nb.y, sel.ne.y);
 928                 }
 929                 sel.tclick2 = sel.tclick1;
 930                 sel.tclick1 = now;
 931         }
 932 }
 933
 934 char *
 935 getsel(void) {
 936         char *str, *ptr;
 937         int y, bufsize, size, lastx, linelen;
 938         Glyph *gp, *last;
 939
 940         if(sel.ob.x == -1)
 941                 return NULL;
 942
 943         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 944         ptr = str = xmalloc(bufsize);
 945
 946         /* append every set & selected glyph to the selection */
 947         for(y = sel.nb.y; y <= sel.ne.y; y++) {
 948                 linelen = tlinelen(y);
 949
 950                 if(sel.type == SEL_RECTANGULAR) {
 951                         gp = &term.line[y][sel.nb.x];
 952                         lastx = sel.ne.x;
 953                 } else {
 954                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 955                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 956                 }
 957                 last = &term.line[y][MIN(lastx, linelen-1)];
 958                 while(last >= gp && last->c[0] == ' ')
 959                         --last;
 960
 961                 for( ; gp <= last; ++gp) {
 962                         if(gp->mode & ATTR_WDUMMY)
 963                                 continue;
 964
 965                         size = utf8len(gp->c);
 966                         memcpy(ptr, gp->c, size);
 967                         ptr += size;
 968                 }
 969
 970                 /*
 971                  * Copy and pasting of line endings is inconsistent
 972                  * in the inconsistent terminal and GUI world.
 973                  * The best solution seems like to produce '\n' when
 974                  * something is copied from st and convert '\n' to
 975                  * '\r', when something to be pasted is received by
 976                  * st.
 977                  * FIXME: Fix the computer world.
 978                  */
 979                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 980                         *ptr++ = '\n';
 981         }
 982         *ptr = 0;
 983         return str;
 984 }
 985
 986 void
 987 selcopy(Time t) {
 988         xsetsel(getsel(), t);
 989 }
 990
 991 void
 992 selnotify(XEvent *e) {
 993         ulong nitems, ofs, rem;
 994         int format;
 995         uchar *data, *last, *repl;
 996         Atom type;
 997         XSelectionEvent *xsev;
 998
 999         ofs = 0;
1000         xsev = &e->xselection;
1001         if (xsev->property == None)
1002             return;
1003         do {
1004                 if(XGetWindowProperty(xw.dpy, xw.win, xsev->property, ofs,
1005                                         BUFSIZ/4, False, AnyPropertyType,
1006                                         &type, &format, &nitems, &rem,
1007                                         &data)) {
1008                         fprintf(stderr, "Clipboard allocation failed\n");
1009                         return;
1010                 }
1011
1012                 /*
1013                  * As seen in getsel:
1014                  * Line endings are inconsistent in the terminal and GUI world
1015                  * copy and pasting. When receiving some selection data,
1016                  * replace all '\n' with '\r'.
1017                  * FIXME: Fix the computer world.
1018                  */
1019                 repl = data;
1020                 last = data + nitems * format / 8;
1021                 while((repl = memchr(repl, '\n', last - repl))) {
1022                         *repl++ = '\r';
1023                 }
1024
1025                 if(IS_SET(MODE_BRCKTPASTE))
1026                         ttywrite("\033[200~", 6);
1027                 ttysend((char *)data, nitems * format / 8);
1028                 if(IS_SET(MODE_BRCKTPASTE))
1029                         ttywrite("\033[201~", 6);
1030                 XFree(data);
1031                 /* number of 32-bit chunks returned */
1032                 ofs += nitems * format / 32;
1033         } while(rem > 0);
1034 }
1035
1036 void
1037 selpaste(const Arg *dummy) {
1038         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1039                         xw.win, CurrentTime);
1040 }
1041
1042 void
1043 clipcopy(const Arg *dummy) {
1044         Atom clipboard;
1045
1046         if(sel.clipboard != NULL)
1047                 free(sel.clipboard);
1048
1049         if(sel.primary != NULL) {
1050                 sel.clipboard = xstrdup(sel.primary);
1051                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1052                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1053         }
1054 }
1055
1056 void
1057 clippaste(const Arg *dummy) {
1058         Atom clipboard;
1059
1060         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1061         XConvertSelection(xw.dpy, clipboard, sel.xtarget, clipboard,
1062                         xw.win, CurrentTime);
1063 }
1064
1065 void
1066 selclear(XEvent *e) {
1067         if(sel.ob.x == -1)
1068                 return;
1069         sel.ob.x = -1;
1070         tsetdirt(sel.nb.y, sel.ne.y);
1071 }
1072
1073 void
1074 selrequest(XEvent *e) {
1075         XSelectionRequestEvent *xsre;
1076         XSelectionEvent xev;
1077         Atom xa_targets, string, clipboard;
1078         char *seltext;
1079
1080         xsre = (XSelectionRequestEvent *) e;
1081         xev.type = SelectionNotify;
1082         xev.requestor = xsre->requestor;
1083         xev.selection = xsre->selection;
1084         xev.target = xsre->target;
1085         xev.time = xsre->time;
1086         if (xsre->property == None)
1087             xsre->property = xsre->target;
1088
1089         /* reject */
1090         xev.property = None;
1091
1092         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1093         if(xsre->target == xa_targets) {
1094                 /* respond with the supported type */
1095                 string = sel.xtarget;
1096                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1097                                 XA_ATOM, 32, PropModeReplace,
1098                                 (uchar *) &string, 1);
1099                 xev.property = xsre->property;
1100         } else if(xsre->target == sel.xtarget || xsre->target == XA_STRING) {
1101                 /*
1102                  * xith XA_STRING non ascii characters may be incorrect in the
1103                  * requestor. It is not our problem, use utf8.
1104                  */
1105                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1106                 if(xsre->selection == XA_PRIMARY) {
1107                         seltext = sel.primary;
1108                 } else if(xsre->selection == clipboard) {
1109                         seltext = sel.clipboard;
1110                 } else {
1111                         fprintf(stderr,
1112                                 "Unhandled clipboard selection 0x%lx\n",
1113                                 xsre->selection);
1114                         return;
1115                 }
1116                 if(seltext != NULL) {
1117                         XChangeProperty(xsre->display, xsre->requestor,
1118                                         xsre->property, xsre->target,
1119                                         8, PropModeReplace,
1120                                         (uchar *)seltext, strlen(seltext));
1121                         xev.property = xsre->property;
1122                 }
1123         }
1124
1125         /* all done, send a notification to the listener */
1126         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1127                 fprintf(stderr, "Error sending SelectionNotify event\n");
1128 }
1129
1130 void
1131 xsetsel(char *str, Time t) {
1132         free(sel.primary);
1133         sel.primary = str;
1134
1135         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
1136         if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
1137             selclear(0);
1138 }
1139
1140 void
1141 brelease(XEvent *e) {
1142         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1143                 mousereport(e);
1144                 return;
1145         }
1146
1147         if(e->xbutton.button == Button2) {
1148                 selpaste(NULL);
1149         } else if(e->xbutton.button == Button1) {
1150                 if(sel.mode < 2) {
1151                         selclear(NULL);
1152                 } else {
1153                         getbuttoninfo(e);
1154                         selcopy(e->xbutton.time);
1155                 }
1156                 sel.mode = 0;
1157                 tsetdirt(sel.nb.y, sel.ne.y);
1158         }
1159 }
1160
1161 void
1162 bmotion(XEvent *e) {
1163         int oldey, oldex, oldsby, oldsey;
1164
1165         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1166                 mousereport(e);
1167                 return;
1168         }
1169
1170         if(!sel.mode)
1171                 return;
1172
1173         sel.mode++;
1174         oldey = sel.oe.y;
1175         oldex = sel.oe.x;
1176         oldsby = sel.nb.y;
1177         oldsey = sel.ne.y;
1178         getbuttoninfo(e);
1179
1180         if(oldey != sel.oe.y || oldex != sel.oe.x)
1181                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1182 }
1183
1184 void
1185 die(const char *errstr, ...) {
1186         va_list ap;
1187
1188         va_start(ap, errstr);
1189         vfprintf(stderr, errstr, ap);
1190         va_end(ap);
1191         exit(EXIT_FAILURE);
1192 }
1193
1194 void
1195 execsh(void) {
1196         char **args, *sh, *prog;
1197         const struct passwd *pw;
1198         char buf[sizeof(long) * 8 + 1];
1199
1200         errno = 0;
1201         if((pw = getpwuid(getuid())) == NULL) {
1202                 if(errno)
1203                         die("getpwuid:%s\n", strerror(errno));
1204                 else
1205                         die("who are you?\n");
1206         }
1207
1208         if (!(sh = getenv("SHELL"))) {
1209                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1210         }
1211
1212         if(opt_cmd)
1213                 prog = opt_cmd[0];
1214         else if(utmp)
1215                 prog = utmp;
1216         else
1217                 prog = sh;
1218         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1219
1220         snprintf(buf, sizeof(buf), "%lu", xw.win);
1221
1222         unsetenv("COLUMNS");
1223         unsetenv("LINES");
1224         unsetenv("TERMCAP");
1225         setenv("LOGNAME", pw->pw_name, 1);
1226         setenv("USER", pw->pw_name, 1);
1227         setenv("SHELL", sh, 1);
1228         setenv("HOME", pw->pw_dir, 1);
1229         setenv("TERM", termname, 1);
1230         setenv("WINDOWID", buf, 1);
1231
1232         signal(SIGCHLD, SIG_DFL);
1233         signal(SIGHUP, SIG_DFL);
1234         signal(SIGINT, SIG_DFL);
1235         signal(SIGQUIT, SIG_DFL);
1236         signal(SIGTERM, SIG_DFL);
1237         signal(SIGALRM, SIG_DFL);
1238
1239         execvp(prog, args);
1240         _exit(EXIT_FAILURE);
1241 }
1242
1243 void
1244 sigchld(int a) {
1245         int stat, ret;
1246
1247         if(waitpid(pid, &stat, 0) < 0)
1248                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1249
1250         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1251         if (ret != EXIT_SUCCESS)
1252                 die("child finished with error '%d'\n", stat);
1253         exit(EXIT_SUCCESS);
1254 }
1255
1256 void
1257 ttynew(void) {
1258         int m, s;
1259         struct winsize w = {term.row, term.col, 0, 0};
1260
1261         /* seems to work fine on linux, openbsd and freebsd */
1262         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1263                 die("openpty failed: %s\n", strerror(errno));
1264
1265         switch(pid = fork()) {
1266         case -1:
1267                 die("fork failed\n");
1268                 break;
1269         case 0:
1270                 setsid(); /* create a new process group */
1271                 dup2(s, STDIN_FILENO);
1272                 dup2(s, STDOUT_FILENO);
1273                 dup2(s, STDERR_FILENO);
1274                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1275                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1276                 close(s);
1277                 close(m);
1278                 execsh();
1279                 break;
1280         default:
1281                 close(s);
1282                 cmdfd = m;
1283                 signal(SIGCHLD, sigchld);
1284                 if(opt_io) {
1285                         term.mode |= MODE_PRINT;
1286                         iofd = (!strcmp(opt_io, "-")) ?
1287                                   STDOUT_FILENO :
1288                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1289                         if(iofd < 0) {
1290                                 fprintf(stderr, "Error opening %s:%s\n",
1291                                         opt_io, strerror(errno));
1292                         }
1293                 }
1294                 break;
1295         }
1296 }
1297
1298 void
1299 ttyread(void) {
1300         static char buf[BUFSIZ];
1301         static int buflen = 0;
1302         char *ptr;
1303         char s[UTF_SIZ];
1304         int charsize; /* size of utf8 char in bytes */
1305         long unicodep;
1306         int ret;
1307
1308         /* append read bytes to unprocessed bytes */
1309         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1310                 die("Couldn't read from shell: %s\n", strerror(errno));
1311
1312         /* process every complete utf8 char */
1313         buflen += ret;
1314         ptr = buf;
1315         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1316                 utf8encode(unicodep, s, UTF_SIZ);
1317                 tputc(s, charsize);
1318                 ptr += charsize;
1319                 buflen -= charsize;
1320         }
1321
1322         /* keep any uncomplete utf8 char for the next call */
1323         memmove(buf, ptr, buflen);
1324 }
1325
1326 void
1327 ttywrite(const char *s, size_t n) {
1328         if(xwrite(cmdfd, s, n) == -1)
1329                 die("write error on tty: %s\n", strerror(errno));
1330 }
1331
1332 void
1333 ttysend(char *s, size_t n) {
1334         ttywrite(s, n);
1335         if(IS_SET(MODE_ECHO))
1336                 techo(s, n);
1337 }
1338
1339 void
1340 ttyresize(void) {
1341         struct winsize w;
1342
1343         w.ws_row = term.row;
1344         w.ws_col = term.col;
1345         w.ws_xpixel = xw.tw;
1346         w.ws_ypixel = xw.th;
1347         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1348                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1349 }
1350
1351 int
1352 tattrset(int attr) {
1353         int i, j;
1354
1355         for(i = 0; i < term.row-1; i++) {
1356                 for(j = 0; j < term.col-1; j++) {
1357                         if(term.line[i][j].mode & attr)
1358                                 return 1;
1359                 }
1360         }
1361
1362         return 0;
1363 }
1364
1365 void
1366 tsetdirt(int top, int bot) {
1367         int i;
1368
1369         LIMIT(top, 0, term.row-1);
1370         LIMIT(bot, 0, term.row-1);
1371
1372         for(i = top; i <= bot; i++)
1373                 term.dirty[i] = 1;
1374 }
1375
1376 void
1377 tsetdirtattr(int attr) {
1378         int i, j;
1379
1380         for(i = 0; i < term.row-1; i++) {
1381                 for(j = 0; j < term.col-1; j++) {
1382                         if(term.line[i][j].mode & attr) {
1383                                 tsetdirt(i, i);
1384                                 break;
1385                         }
1386                 }
1387         }
1388 }
1389
1390 void
1391 tfulldirt(void) {
1392         tsetdirt(0, term.row-1);
1393 }
1394
1395 void
1396 tcursor(int mode) {
1397         static TCursor c[2];
1398         bool alt = IS_SET(MODE_ALTSCREEN);
1399
1400         if(mode == CURSOR_SAVE) {
1401                 c[alt] = term.c;
1402         } else if(mode == CURSOR_LOAD) {
1403                 term.c = c[alt];
1404                 tmoveto(c[alt].x, c[alt].y);
1405         }
1406 }
1407
1408 void
1409 treset(void) {
1410         uint i;
1411
1412         term.c = (TCursor){{
1413                 .mode = ATTR_NULL,
1414                 .fg = defaultfg,
1415                 .bg = defaultbg
1416         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1417
1418         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1419         for(i = tabspaces; i < term.col; i += tabspaces)
1420                 term.tabs[i] = 1;
1421         term.top = 0;
1422         term.bot = term.row - 1;
1423         term.mode = MODE_WRAP;
1424         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1425         term.charset = 0;
1426
1427         for(i = 0; i < 2; i++) {
1428                 tmoveto(0, 0);
1429                 tcursor(CURSOR_SAVE);
1430                 tclearregion(0, 0, term.col-1, term.row-1);
1431                 tswapscreen();
1432         }
1433 }
1434
1435 void
1436 tnew(int col, int row) {
1437         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1438         tresize(col, row);
1439         term.numlock = 1;
1440
1441         treset();
1442 }
1443
1444 void
1445 tswapscreen(void) {
1446         Line *tmp = term.line;
1447
1448         term.line = term.alt;
1449         term.alt = tmp;
1450         term.mode ^= MODE_ALTSCREEN;
1451         tfulldirt();
1452 }
1453
1454 void
1455 tscrolldown(int orig, int n) {
1456         int i;
1457         Line temp;
1458
1459         LIMIT(n, 0, term.bot-orig+1);
1460
1461         tsetdirt(orig, term.bot-n);
1462         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1463
1464         for(i = term.bot; i >= orig+n; i--) {
1465                 temp = term.line[i];
1466                 term.line[i] = term.line[i-n];
1467                 term.line[i-n] = temp;
1468         }
1469
1470         selscroll(orig, n);
1471 }
1472
1473 void
1474 tscrollup(int orig, int n) {
1475         int i;
1476         Line temp;
1477
1478         LIMIT(n, 0, term.bot-orig+1);
1479
1480         tclearregion(0, orig, term.col-1, orig+n-1);
1481         tsetdirt(orig+n, term.bot);
1482
1483         for(i = orig; i <= term.bot-n; i++) {
1484                 temp = term.line[i];
1485                 term.line[i] = term.line[i+n];
1486                 term.line[i+n] = temp;
1487         }
1488
1489         selscroll(orig, -n);
1490 }
1491
1492 void
1493 selscroll(int orig, int n) {
1494         if(sel.ob.x == -1)
1495                 return;
1496
1497         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1498                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1499                         selclear(NULL);
1500                         return;
1501                 }
1502                 if(sel.type == SEL_RECTANGULAR) {
1503                         if(sel.ob.y < term.top)
1504                                 sel.ob.y = term.top;
1505                         if(sel.oe.y > term.bot)
1506                                 sel.oe.y = term.bot;
1507                 } else {
1508                         if(sel.ob.y < term.top) {
1509                                 sel.ob.y = term.top;
1510                                 sel.ob.x = 0;
1511                         }
1512                         if(sel.oe.y > term.bot) {
1513                                 sel.oe.y = term.bot;
1514                                 sel.oe.x = term.col;
1515                         }
1516                 }
1517                 selnormalize();
1518         }
1519 }
1520
1521 void
1522 tnewline(int first_col) {
1523         int y = term.c.y;
1524
1525         if(y == term.bot) {
1526                 tscrollup(term.top, 1);
1527         } else {
1528                 y++;
1529         }
1530         tmoveto(first_col ? 0 : term.c.x, y);
1531 }
1532
1533 void
1534 csiparse(void) {
1535         char *p = csiescseq.buf, *np;
1536         long int v;
1537
1538         csiescseq.narg = 0;
1539         if(*p == '?') {
1540                 csiescseq.priv = 1;
1541                 p++;
1542         }
1543
1544         csiescseq.buf[csiescseq.len] = '\0';
1545         while(p < csiescseq.buf+csiescseq.len) {
1546                 np = NULL;
1547                 v = strtol(p, &np, 10);
1548                 if(np == p)
1549                         v = 0;
1550                 if(v == LONG_MAX || v == LONG_MIN)
1551                         v = -1;
1552                 csiescseq.arg[csiescseq.narg++] = v;
1553                 p = np;
1554                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1555                         break;
1556                 p++;
1557         }
1558         csiescseq.mode[0] = *p++;
1559         csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1560 }
1561
1562 /* for absolute user moves, when decom is set */
1563 void
1564 tmoveato(int x, int y) {
1565         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1566 }
1567
1568 void
1569 tmoveto(int x, int y) {
1570         int miny, maxy;
1571
1572         if(term.c.state & CURSOR_ORIGIN) {
1573                 miny = term.top;
1574                 maxy = term.bot;
1575         } else {
1576                 miny = 0;
1577                 maxy = term.row - 1;
1578         }
1579         term.c.state &= ~CURSOR_WRAPNEXT;
1580         term.c.x = LIMIT(x, 0, term.col-1);
1581         term.c.y = LIMIT(y, miny, maxy);
1582 }
1583
1584 void
1585 tsetchar(char *c, Glyph *attr, int x, int y) {
1586         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1587                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1588                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1589                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1590                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1591                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1592                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1593                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1594                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1595         };
1596
1597         /*
1598          * The table is proudly stolen from rxvt.
1599          */
1600         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1601                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1602                         c = vt100_0[c[0] - 0x41];
1603                 }
1604         }
1605
1606         if(term.line[y][x].mode & ATTR_WIDE) {
1607                 if(x+1 < term.col) {
1608                         term.line[y][x+1].c[0] = ' ';
1609                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1610                 }
1611         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1612                 term.line[y][x-1].c[0] = ' ';
1613                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1614         }
1615
1616         term.dirty[y] = 1;
1617         term.line[y][x] = *attr;
1618         memcpy(term.line[y][x].c, c, UTF_SIZ);
1619 }
1620
1621 void
1622 tclearregion(int x1, int y1, int x2, int y2) {
1623         int x, y, temp;
1624         Glyph *gp;
1625
1626         if(x1 > x2)
1627                 temp = x1, x1 = x2, x2 = temp;
1628         if(y1 > y2)
1629                 temp = y1, y1 = y2, y2 = temp;
1630
1631         LIMIT(x1, 0, term.col-1);
1632         LIMIT(x2, 0, term.col-1);
1633         LIMIT(y1, 0, term.row-1);
1634         LIMIT(y2, 0, term.row-1);
1635
1636         for(y = y1; y <= y2; y++) {
1637                 term.dirty[y] = 1;
1638                 for(x = x1; x <= x2; x++) {
1639                         gp = &term.line[y][x];
1640                         if(selected(x, y))
1641                                 selclear(NULL);
1642                         gp->fg = term.c.attr.fg;
1643                         gp->bg = term.c.attr.bg;
1644                         gp->mode = 0;
1645                         memcpy(gp->c, " ", 2);
1646                 }
1647         }
1648 }
1649
1650 void
1651 tdeletechar(int n) {
1652         int dst, src, size;
1653         Glyph *line;
1654
1655         LIMIT(n, 0, term.col - term.c.x);
1656
1657         dst = term.c.x;
1658         src = term.c.x + n;
1659         size = term.col - src;
1660         line = term.line[term.c.y];
1661
1662         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1663         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1664 }
1665
1666 void
1667 tinsertblank(int n) {
1668         int dst, src, size;
1669         Glyph *line;
1670
1671         LIMIT(n, 0, term.col - term.c.x);
1672
1673         dst = term.c.x + n;
1674         src = term.c.x;
1675         size = term.col - dst;
1676         line = term.line[term.c.y];
1677
1678         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1679         tclearregion(src, term.c.y, dst - 1, term.c.y);
1680 }
1681
1682 void
1683 tinsertblankline(int n) {
1684         if(BETWEEN(term.c.y, term.top, term.bot))
1685                 tscrolldown(term.c.y, n);
1686 }
1687
1688 void
1689 tdeleteline(int n) {
1690         if(BETWEEN(term.c.y, term.top, term.bot))
1691                 tscrollup(term.c.y, n);
1692 }
1693
1694 int32_t
1695 tdefcolor(int *attr, int *npar, int l) {
1696         int32_t idx = -1;
1697         uint r, g, b;
1698
1699         switch (attr[*npar + 1]) {
1700         case 2: /* direct color in RGB space */
1701                 if (*npar + 4 >= l) {
1702                         fprintf(stderr,
1703                                 "erresc(38): Incorrect number of parameters (%d)\n",
1704                                 *npar);
1705                         break;
1706                 }
1707                 r = attr[*npar + 2];
1708                 g = attr[*npar + 3];
1709                 b = attr[*npar + 4];
1710                 *npar += 4;
1711                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1712                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1713                                 r, g, b);
1714                 else
1715                         idx = TRUECOLOR(r, g, b);
1716                 break;
1717         case 5: /* indexed color */
1718                 if (*npar + 2 >= l) {
1719                         fprintf(stderr,
1720                                 "erresc(38): Incorrect number of parameters (%d)\n",
1721                                 *npar);
1722                         break;
1723                 }
1724                 *npar += 2;
1725                 if(!BETWEEN(attr[*npar], 0, 255))
1726                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1727                 else
1728                         idx = attr[*npar];
1729                 break;
1730         case 0: /* implemented defined (only foreground) */
1731         case 1: /* transparent */
1732         case 3: /* direct color in CMY space */
1733         case 4: /* direct color in CMYK space */
1734         default:
1735                 fprintf(stderr,
1736                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1737                 break;
1738         }
1739
1740         return idx;
1741 }
1742
1743 void
1744 tsetattr(int *attr, int l) {
1745         int i;
1746         int32_t idx;
1747
1748         for(i = 0; i < l; i++) {
1749                 switch(attr[i]) {
1750                 case 0:
1751                         term.c.attr.mode &= ~(
1752                                 ATTR_BOLD       |
1753                                 ATTR_FAINT      |
1754                                 ATTR_ITALIC     |
1755                                 ATTR_UNDERLINE  |
1756                                 ATTR_BLINK      |
1757                                 ATTR_REVERSE    |
1758                                 ATTR_INVISIBLE  |
1759                                 ATTR_STRUCK     );
1760                         term.c.attr.fg = defaultfg;
1761                         term.c.attr.bg = defaultbg;
1762                         break;
1763                 case 1:
1764                         term.c.attr.mode |= ATTR_BOLD;
1765                         break;
1766                 case 2:
1767                         term.c.attr.mode |= ATTR_FAINT;
1768                         break;
1769                 case 3:
1770                         term.c.attr.mode |= ATTR_ITALIC;
1771                         break;
1772                 case 4:
1773                         term.c.attr.mode |= ATTR_UNDERLINE;
1774                         break;
1775                 case 5: /* slow blink */
1776                         /* FALLTHROUGH */
1777                 case 6: /* rapid blink */
1778                         term.c.attr.mode |= ATTR_BLINK;
1779                         break;
1780                 case 7:
1781                         term.c.attr.mode |= ATTR_REVERSE;
1782                         break;
1783                 case 8:
1784                         term.c.attr.mode |= ATTR_INVISIBLE;
1785                         break;
1786                 case 9:
1787                         term.c.attr.mode |= ATTR_STRUCK;
1788                         break;
1789                 case 22:
1790                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1791                         break;
1792                 case 23:
1793                         term.c.attr.mode &= ~ATTR_ITALIC;
1794                         break;
1795                 case 24:
1796                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1797                         break;
1798                 case 25:
1799                         term.c.attr.mode &= ~ATTR_BLINK;
1800                         break;
1801                 case 27:
1802                         term.c.attr.mode &= ~ATTR_REVERSE;
1803                         break;
1804                 case 28:
1805                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1806                         break;
1807                 case 29:
1808                         term.c.attr.mode &= ~ATTR_STRUCK;
1809                         break;
1810                 case 38:
1811                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1812                                 term.c.attr.fg = idx;
1813                         break;
1814                 case 39:
1815                         term.c.attr.fg = defaultfg;
1816                         break;
1817                 case 48:
1818                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1819                                 term.c.attr.bg = idx;
1820                         break;
1821                 case 49:
1822                         term.c.attr.bg = defaultbg;
1823                         break;
1824                 default:
1825                         if(BETWEEN(attr[i], 30, 37)) {
1826                                 term.c.attr.fg = attr[i] - 30;
1827                         } else if(BETWEEN(attr[i], 40, 47)) {
1828                                 term.c.attr.bg = attr[i] - 40;
1829                         } else if(BETWEEN(attr[i], 90, 97)) {
1830                                 term.c.attr.fg = attr[i] - 90 + 8;
1831                         } else if(BETWEEN(attr[i], 100, 107)) {
1832                                 term.c.attr.bg = attr[i] - 100 + 8;
1833                         } else {
1834                                 fprintf(stderr,
1835                                         "erresc(default): gfx attr %d unknown\n",
1836                                         attr[i]), csidump();
1837                         }
1838                         break;
1839                 }
1840         }
1841 }
1842
1843 void
1844 tsetscroll(int t, int b) {
1845         int temp;
1846
1847         LIMIT(t, 0, term.row-1);
1848         LIMIT(b, 0, term.row-1);
1849         if(t > b) {
1850                 temp = t;
1851                 t = b;
1852                 b = temp;
1853         }
1854         term.top = t;
1855         term.bot = b;
1856 }
1857
1858 void
1859 tsetmode(bool priv, bool set, int *args, int narg) {
1860         int *lim, mode;
1861         bool alt;
1862
1863         for(lim = args + narg; args < lim; ++args) {
1864                 if(priv) {
1865                         switch(*args) {
1866                         case 1: /* DECCKM -- Cursor key */
1867                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1868                                 break;
1869                         case 5: /* DECSCNM -- Reverse video */
1870                                 mode = term.mode;
1871                                 MODBIT(term.mode, set, MODE_REVERSE);
1872                                 if(mode != term.mode)
1873                                         redraw();
1874                                 break;
1875                         case 6: /* DECOM -- Origin */
1876                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1877                                 tmoveato(0, 0);
1878                                 break;
1879                         case 7: /* DECAWM -- Auto wrap */
1880                                 MODBIT(term.mode, set, MODE_WRAP);
1881                                 break;
1882                         case 0:  /* Error (IGNORED) */
1883                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1884                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1885                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1886                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1887                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1888                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1889                         case 42: /* DECNRCM -- National characters (IGNORED) */
1890                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1891                                 break;
1892                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1893                                 MODBIT(term.mode, !set, MODE_HIDE);
1894                                 break;
1895                         case 9:    /* X10 mouse compatibility mode */
1896                                 xsetpointermotion(0);
1897                                 MODBIT(term.mode, 0, MODE_MOUSE);
1898                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1899                                 break;
1900                         case 1000: /* 1000: report button press */
1901                                 xsetpointermotion(0);
1902                                 MODBIT(term.mode, 0, MODE_MOUSE);
1903                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1904                                 break;
1905                         case 1002: /* 1002: report motion on button press */
1906                                 xsetpointermotion(0);
1907                                 MODBIT(term.mode, 0, MODE_MOUSE);
1908                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1909                                 break;
1910                         case 1003: /* 1003: enable all mouse motions */
1911                                 xsetpointermotion(set);
1912                                 MODBIT(term.mode, 0, MODE_MOUSE);
1913                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1914                                 break;
1915                         case 1004: /* 1004: send focus events to tty */
1916                                 MODBIT(term.mode, set, MODE_FOCUS);
1917                                 break;
1918                         case 1006: /* 1006: extended reporting mode */
1919                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1920                                 break;
1921                         case 1034:
1922                                 MODBIT(term.mode, set, MODE_8BIT);
1923                                 break;
1924                         case 1049: /* swap screen & set/restore cursor as xterm */
1925                                 if (!allowaltscreen)
1926                                         break;
1927                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1928                                 /* FALLTHROUGH */
1929                         case 47: /* swap screen */
1930                         case 1047:
1931                                 if (!allowaltscreen)
1932                                         break;
1933                                 alt = IS_SET(MODE_ALTSCREEN);
1934                                 if(alt) {
1935                                         tclearregion(0, 0, term.col-1,
1936                                                         term.row-1);
1937                                 }
1938                                 if(set ^ alt) /* set is always 1 or 0 */
1939                                         tswapscreen();
1940                                 if(*args != 1049)
1941                                         break;
1942                                 /* FALLTHROUGH */
1943                         case 1048:
1944                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1945                                 break;
1946                         case 2004: /* 2004: bracketed paste mode */
1947                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1948                                 break;
1949                         /* Not implemented mouse modes. See comments there. */
1950                         case 1001: /* mouse highlight mode; can hang the
1951                                       terminal by design when implemented. */
1952                         case 1005: /* UTF-8 mouse mode; will confuse
1953                                       applications not supporting UTF-8
1954                                       and luit. */
1955                         case 1015: /* urxvt mangled mouse mode; incompatible
1956                                       and can be mistaken for other control
1957                                       codes. */
1958                         default:
1959                                 fprintf(stderr,
1960                                         "erresc: unknown private set/reset mode %d\n",
1961                                         *args);
1962                                 break;
1963                         }
1964                 } else {
1965                         switch(*args) {
1966                         case 0:  /* Error (IGNORED) */
1967                                 break;
1968                         case 2:  /* KAM -- keyboard action */
1969                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1970                                 break;
1971                         case 4:  /* IRM -- Insertion-replacement */
1972                                 MODBIT(term.mode, set, MODE_INSERT);
1973                                 break;
1974                         case 12: /* SRM -- Send/Receive */
1975                                 MODBIT(term.mode, !set, MODE_ECHO);
1976                                 break;
1977                         case 20: /* LNM -- Linefeed/new line */
1978                                 MODBIT(term.mode, set, MODE_CRLF);
1979                                 break;
1980                         default:
1981                                 fprintf(stderr,
1982                                         "erresc: unknown set/reset mode %d\n",
1983                                         *args);
1984                                 break;
1985                         }
1986                 }
1987         }
1988 }
1989
1990 void
1991 csihandle(void) {
1992         char buf[40];
1993         int len;
1994
1995         switch(csiescseq.mode[0]) {
1996         default:
1997         unknown:
1998                 fprintf(stderr, "erresc: unknown csi ");
1999                 csidump();
2000                 /* die(""); */
2001                 break;
2002         case '@': /* ICH -- Insert <n> blank char */
2003                 DEFAULT(csiescseq.arg[0], 1);
2004                 tinsertblank(csiescseq.arg[0]);
2005                 break;
2006         case 'A': /* CUU -- Cursor <n> Up */
2007                 DEFAULT(csiescseq.arg[0], 1);
2008                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
2009                 break;
2010         case 'B': /* CUD -- Cursor <n> Down */
2011         case 'e': /* VPR --Cursor <n> Down */
2012                 DEFAULT(csiescseq.arg[0], 1);
2013                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
2014                 break;
2015         case 'i': /* MC -- Media Copy */
2016                 switch(csiescseq.arg[0]) {
2017                 case 0:
2018                         tdump();
2019                         break;
2020                 case 1:
2021                         tdumpline(term.c.y);
2022                         break;
2023                 case 2:
2024                         tdumpsel();
2025                         break;
2026                 case 4:
2027                         term.mode &= ~MODE_PRINT;
2028                         break;
2029                 case 5:
2030                         term.mode |= MODE_PRINT;
2031                         break;
2032                 }
2033                 break;
2034         case 'c': /* DA -- Device Attributes */
2035                 if(csiescseq.arg[0] == 0)
2036                         ttywrite(vtiden, sizeof(vtiden) - 1);
2037                 break;
2038         case 'C': /* CUF -- Cursor <n> Forward */
2039         case 'a': /* HPR -- Cursor <n> Forward */
2040                 DEFAULT(csiescseq.arg[0], 1);
2041                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
2042                 break;
2043         case 'D': /* CUB -- Cursor <n> Backward */
2044                 DEFAULT(csiescseq.arg[0], 1);
2045                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2046                 break;
2047         case 'E': /* CNL -- Cursor <n> Down and first col */
2048                 DEFAULT(csiescseq.arg[0], 1);
2049                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2050                 break;
2051         case 'F': /* CPL -- Cursor <n> Up and first col */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2054                 break;
2055         case 'g': /* TBC -- Tabulation clear */
2056                 switch(csiescseq.arg[0]) {
2057                 case 0: /* clear current tab stop */
2058                         term.tabs[term.c.x] = 0;
2059                         break;
2060                 case 3: /* clear all the tabs */
2061                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2062                         break;
2063                 default:
2064                         goto unknown;
2065                 }
2066                 break;
2067         case 'G': /* CHA -- Move to <col> */
2068         case '`': /* HPA */
2069                 DEFAULT(csiescseq.arg[0], 1);
2070                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2071                 break;
2072         case 'H': /* CUP -- Move to <row> <col> */
2073         case 'f': /* HVP */
2074                 DEFAULT(csiescseq.arg[0], 1);
2075                 DEFAULT(csiescseq.arg[1], 1);
2076                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2077                 break;
2078         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2079                 DEFAULT(csiescseq.arg[0], 1);
2080                 tputtab(csiescseq.arg[0]);
2081                 break;
2082         case 'J': /* ED -- Clear screen */
2083                 selclear(NULL);
2084                 switch(csiescseq.arg[0]) {
2085                 case 0: /* below */
2086                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2087                         if(term.c.y < term.row-1) {
2088                                 tclearregion(0, term.c.y+1, term.col-1,
2089                                                 term.row-1);
2090                         }
2091                         break;
2092                 case 1: /* above */
2093                         if(term.c.y > 1)
2094                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2095                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2096                         break;
2097                 case 2: /* all */
2098                         tclearregion(0, 0, term.col-1, term.row-1);
2099                         break;
2100                 default:
2101                         goto unknown;
2102                 }
2103                 break;
2104         case 'K': /* EL -- Clear line */
2105                 switch(csiescseq.arg[0]) {
2106                 case 0: /* right */
2107                         tclearregion(term.c.x, term.c.y, term.col-1,
2108                                         term.c.y);
2109                         break;
2110                 case 1: /* left */
2111                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2112                         break;
2113                 case 2: /* all */
2114                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2115                         break;
2116                 }
2117                 break;
2118         case 'S': /* SU -- Scroll <n> line up */
2119                 DEFAULT(csiescseq.arg[0], 1);
2120                 tscrollup(term.top, csiescseq.arg[0]);
2121                 break;
2122         case 'T': /* SD -- Scroll <n> line down */
2123                 DEFAULT(csiescseq.arg[0], 1);
2124                 tscrolldown(term.top, csiescseq.arg[0]);
2125                 break;
2126         case 'L': /* IL -- Insert <n> blank lines */
2127                 DEFAULT(csiescseq.arg[0], 1);
2128                 tinsertblankline(csiescseq.arg[0]);
2129                 break;
2130         case 'l': /* RM -- Reset Mode */
2131                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2132                 break;
2133         case 'M': /* DL -- Delete <n> lines */
2134                 DEFAULT(csiescseq.arg[0], 1);
2135                 tdeleteline(csiescseq.arg[0]);
2136                 break;
2137         case 'X': /* ECH -- Erase <n> char */
2138                 DEFAULT(csiescseq.arg[0], 1);
2139                 tclearregion(term.c.x, term.c.y,
2140                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2141                 break;
2142         case 'P': /* DCH -- Delete <n> char */
2143                 DEFAULT(csiescseq.arg[0], 1);
2144                 tdeletechar(csiescseq.arg[0]);
2145                 break;
2146         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2147                 DEFAULT(csiescseq.arg[0], 1);
2148                 tputtab(-csiescseq.arg[0]);
2149                 break;
2150         case 'd': /* VPA -- Move to <row> */
2151                 DEFAULT(csiescseq.arg[0], 1);
2152                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2153                 break;
2154         case 'h': /* SM -- Set terminal mode */
2155                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2156                 break;
2157         case 'm': /* SGR -- Terminal attribute (color) */
2158                 tsetattr(csiescseq.arg, csiescseq.narg);
2159                 break;
2160         case 'n': /* DSR – Device Status Report (cursor position) */
2161                 if (csiescseq.arg[0] == 6) {
2162                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2163                                         term.c.y+1, term.c.x+1);
2164                         ttywrite(buf, len);
2165                 }
2166                 break;
2167         case 'r': /* DECSTBM -- Set Scrolling Region */
2168                 if(csiescseq.priv) {
2169                         goto unknown;
2170                 } else {
2171                         DEFAULT(csiescseq.arg[0], 1);
2172                         DEFAULT(csiescseq.arg[1], term.row);
2173                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2174                         tmoveato(0, 0);
2175                 }
2176                 break;
2177         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2178                 tcursor(CURSOR_SAVE);
2179                 break;
2180         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2181                 tcursor(CURSOR_LOAD);
2182                 break;
2183         case ' ':
2184                 switch (csiescseq.mode[1]) {
2185                         case 'q': /* DECSCUSR -- Set Cursor Style */
2186                                 DEFAULT(csiescseq.arg[0], 1);
2187                                 if (!BETWEEN(csiescseq.arg[0], 0, 6)) {
2188                                         goto unknown;
2189                                 }
2190                                 xw.cursor = csiescseq.arg[0];
2191                                 break;
2192                         default:
2193                                 goto unknown;
2194                 }
2195                 break;
2196         }
2197 }
2198
2199 void
2200 csidump(void) {
2201         int i;
2202         uint c;
2203
2204         printf("ESC[");
2205         for(i = 0; i < csiescseq.len; i++) {
2206                 c = csiescseq.buf[i] & 0xff;
2207                 if(isprint(c)) {
2208                         putchar(c);
2209                 } else if(c == '\n') {
2210                         printf("(\\n)");
2211                 } else if(c == '\r') {
2212                         printf("(\\r)");
2213                 } else if(c == 0x1b) {
2214                         printf("(\\e)");
2215                 } else {
2216                         printf("(%02x)", c);
2217                 }
2218         }
2219         putchar('\n');
2220 }
2221
2222 void
2223 csireset(void) {
2224         memset(&csiescseq, 0, sizeof(csiescseq));
2225 }
2226
2227 void
2228 strhandle(void) {
2229         char *p = NULL;
2230         int j, narg, par;
2231
2232         term.esc &= ~(ESC_STR_END|ESC_STR);
2233         strparse();
2234         narg = strescseq.narg;
2235         par = atoi(strescseq.args[0]);
2236
2237         switch(strescseq.type) {
2238         case ']': /* OSC -- Operating System Command */
2239                 switch(par) {
2240                 case 0:
2241                 case 1:
2242                 case 2:
2243                         if(narg > 1)
2244                                 xsettitle(strescseq.args[1]);
2245                         return;
2246                 case 4: /* color set */
2247                         if(narg < 3)
2248                                 break;
2249                         p = strescseq.args[2];
2250                         /* FALLTHROUGH */
2251                 case 104: /* color reset, here p = NULL */
2252                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2253                         if(xsetcolorname(j, p)) {
2254                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2255                         } else {
2256                                 /*
2257                                  * TODO if defaultbg color is changed, borders
2258                                  * are dirty
2259                                  */
2260                                 redraw();
2261                         }
2262                         return;
2263                 }
2264                 break;
2265         case 'k': /* old title set compatibility */
2266                 xsettitle(strescseq.args[0]);
2267                 return;
2268         case 'P': /* DCS -- Device Control String */
2269         case '_': /* APC -- Application Program Command */
2270         case '^': /* PM -- Privacy Message */
2271                 return;
2272         }
2273
2274         fprintf(stderr, "erresc: unknown str ");
2275         strdump();
2276 }
2277
2278 void
2279 strparse(void) {
2280         int c;
2281         char *p = strescseq.buf;
2282
2283         strescseq.narg = 0;
2284         strescseq.buf[strescseq.len] = '\0';
2285
2286         if(*p == '\0')
2287                 return;
2288
2289         while(strescseq.narg < STR_ARG_SIZ) {
2290                 strescseq.args[strescseq.narg++] = p;
2291                 while((c = *p) != ';' && c != '\0')
2292                         ++p;
2293                 if(c == '\0')
2294                         return;
2295                 *p++ = '\0';
2296         }
2297 }
2298
2299 void
2300 strdump(void) {
2301         int i;
2302         uint c;
2303
2304         printf("ESC%c", strescseq.type);
2305         for(i = 0; i < strescseq.len; i++) {
2306                 c = strescseq.buf[i] & 0xff;
2307                 if(c == '\0') {
2308                         return;
2309                 } else if(isprint(c)) {
2310                         putchar(c);
2311                 } else if(c == '\n') {
2312                         printf("(\\n)");
2313                 } else if(c == '\r') {
2314                         printf("(\\r)");
2315                 } else if(c == 0x1b) {
2316                         printf("(\\e)");
2317                 } else {
2318                         printf("(%02x)", c);
2319                 }
2320         }
2321         printf("ESC\\\n");
2322 }
2323
2324 void
2325 strreset(void) {
2326         memset(&strescseq, 0, sizeof(strescseq));
2327 }
2328
2329 void
2330 tprinter(char *s, size_t len) {
2331         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2332                 fprintf(stderr, "Error writing in %s:%s\n",
2333                         opt_io, strerror(errno));
2334                 close(iofd);
2335                 iofd = -1;
2336         }
2337 }
2338
2339 void
2340 toggleprinter(const Arg *arg) {
2341         term.mode ^= MODE_PRINT;
2342 }
2343
2344 void
2345 printscreen(const Arg *arg) {
2346         tdump();
2347 }
2348
2349 void
2350 printsel(const Arg *arg) {
2351         tdumpsel();
2352 }
2353
2354 void
2355 tdumpsel(void) {
2356         char *ptr;
2357
2358         if((ptr = getsel())) {
2359                 tprinter(ptr, strlen(ptr));
2360                 free(ptr);
2361         }
2362 }
2363
2364 void
2365 tdumpline(int n) {
2366         Glyph *bp, *end;
2367
2368         bp = &term.line[n][0];
2369         end = &bp[MIN(tlinelen(n), term.col) - 1];
2370         if(bp != end || bp->c[0] != ' ') {
2371                 for( ;bp <= end; ++bp)
2372                         tprinter(bp->c, utf8len(bp->c));
2373         }
2374         tprinter("\n", 1);
2375 }
2376
2377 void
2378 tdump(void) {
2379         int i;
2380
2381         for(i = 0; i < term.row; ++i)
2382                 tdumpline(i);
2383 }
2384
2385 void
2386 tputtab(int n) {
2387         uint x = term.c.x;
2388
2389         if(n > 0) {
2390                 while(x < term.col && n--)
2391                         for(++x; x < term.col && !term.tabs[x]; ++x)
2392                                 /* nothing */ ;
2393         } else if(n < 0) {
2394                 while(x > 0 && n++)
2395                         for(--x; x > 0 && !term.tabs[x]; --x)
2396                                 /* nothing */ ;
2397         }
2398         term.c.x = LIMIT(x, 0, term.col-1);
2399 }
2400
2401 void
2402 techo(char *buf, int len) {
2403         for(; len > 0; buf++, len--) {
2404                 char c = *buf;
2405
2406                 if(ISCONTROL((uchar) c)) { /* control code */
2407                         if(c & 0x80) {
2408                                 c &= 0x7f;
2409                                 tputc("^", 1);
2410                                 tputc("[", 1);
2411                         } else if(c != '\n' && c != '\r' && c != '\t') {
2412                                 c ^= 0x40;
2413                                 tputc("^", 1);
2414                         }
2415                         tputc(&c, 1);
2416                 } else {
2417                         break;
2418                 }
2419         }
2420         if(len)
2421                 tputc(buf, len);
2422 }
2423
2424 void
2425 tdeftran(char ascii) {
2426         static char cs[] = "0B";
2427         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2428         char *p;
2429
2430         if((p = strchr(cs, ascii)) == NULL) {
2431                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2432         } else {
2433                 term.trantbl[term.icharset] = vcs[p - cs];
2434         }
2435 }
2436
2437 void
2438 tdectest(char c) {
2439         static char E[UTF_SIZ] = "E";
2440         int x, y;
2441
2442         if(c == '8') { /* DEC screen alignment test. */
2443                 for(x = 0; x < term.col; ++x) {
2444                         for(y = 0; y < term.row; ++y)
2445                                 tsetchar(E, &term.c.attr, x, y);
2446                 }
2447         }
2448 }
2449
2450 void
2451 tstrsequence(uchar c) {
2452         switch (c) {
2453         case 0x90:   /* DCS -- Device Control String */
2454                 c = 'P';
2455                 break;
2456         case 0x9f:   /* APC -- Application Program Command */
2457                 c = '_';
2458                 break;
2459         case 0x9e:   /* PM -- Privacy Message */
2460                 c = '^';
2461                 break;
2462         case 0x9d:   /* OSC -- Operating System Command */
2463                 c = ']';
2464                 break;
2465         }
2466         strreset();
2467         strescseq.type = c;
2468         term.esc |= ESC_STR;
2469         return;
2470 }
2471
2472 void
2473 tcontrolcode(uchar ascii) {
2474         static char question[UTF_SIZ] = "?";
2475
2476         switch(ascii) {
2477         case '\t':   /* HT */
2478                 tputtab(1);
2479                 return;
2480         case '\b':   /* BS */
2481                 tmoveto(term.c.x-1, term.c.y);
2482                 return;
2483         case '\r':   /* CR */
2484                 tmoveto(0, term.c.y);
2485                 return;
2486         case '\f':   /* LF */
2487         case '\v':   /* VT */
2488         case '\n':   /* LF */
2489                 /* go to first col if the mode is set */
2490                 tnewline(IS_SET(MODE_CRLF));
2491                 return;
2492         case '\a':   /* BEL */
2493                 if(term.esc & ESC_STR_END) {
2494                         /* backwards compatibility to xterm */
2495                         strhandle();
2496                 } else {
2497                         if(!(xw.state & WIN_FOCUSED))
2498                                 xseturgency(1);
2499                         if (bellvolume)
2500                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2501                 }
2502                 break;
2503         case '\033': /* ESC */
2504                 csireset();
2505                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2506                 term.esc |= ESC_START;
2507                 return;
2508         case '\016': /* SO (LS1 -- Locking shift 1) */
2509         case '\017': /* SI (LS0 -- Locking shift 0) */
2510                 term.charset = 1 - (ascii - '\016');
2511                 return;
2512         case '\032': /* SUB */
2513                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2514         case '\030': /* CAN */
2515                 csireset();
2516                 break;
2517         case '\005': /* ENQ (IGNORED) */
2518         case '\000': /* NUL (IGNORED) */
2519         case '\021': /* XON (IGNORED) */
2520         case '\023': /* XOFF (IGNORED) */
2521         case 0177:   /* DEL (IGNORED) */
2522                 return;
2523         case 0x84:   /* TODO: IND */
2524                 break;
2525         case 0x85:   /* NEL -- Next line */
2526                 tnewline(1); /* always go to first col */
2527                 break;
2528         case 0x88:   /* HTS -- Horizontal tab stop */
2529                 term.tabs[term.c.x] = 1;
2530                 break;
2531         case 0x8d:   /* TODO: RI */
2532         case 0x8e:   /* TODO: SS2 */
2533         case 0x8f:   /* TODO: SS3 */
2534         case 0x98:   /* TODO: SOS */
2535                 break;
2536         case 0x9a:   /* DECID -- Identify Terminal */
2537                 ttywrite(vtiden, sizeof(vtiden) - 1);
2538                 break;
2539         case 0x9b:   /* TODO: CSI */
2540         case 0x9c:   /* TODO: ST */
2541                 break;
2542         case 0x90:   /* DCS -- Device Control String */
2543         case 0x9f:   /* APC -- Application Program Command */
2544         case 0x9e:   /* PM -- Privacy Message */
2545         case 0x9d:   /* OSC -- Operating System Command */
2546                 tstrsequence(ascii);
2547                 return;
2548         }
2549         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2550         term.esc &= ~(ESC_STR_END|ESC_STR);
2551         return;
2552 }
2553
2554 /*
2555  * returns 1 when the sequence is finished and it hasn't to read
2556  * more characters for this sequence, otherwise 0
2557  */
2558 int
2559 eschandle(uchar ascii) {
2560         switch(ascii) {
2561         case '[':
2562                 term.esc |= ESC_CSI;
2563                 return 0;
2564         case '#':
2565                 term.esc |= ESC_TEST;
2566                 return 0;
2567         case 'P': /* DCS -- Device Control String */
2568         case '_': /* APC -- Application Program Command */
2569         case '^': /* PM -- Privacy Message */
2570         case ']': /* OSC -- Operating System Command */
2571         case 'k': /* old title set compatibility */
2572                 tstrsequence(ascii);
2573                 return 0;
2574         case 'n': /* LS2 -- Locking shift 2 */
2575         case 'o': /* LS3 -- Locking shift 3 */
2576                 term.charset = 2 + (ascii - 'n');
2577                 break;
2578         case '(': /* GZD4 -- set primary charset G0 */
2579         case ')': /* G1D4 -- set secondary charset G1 */
2580         case '*': /* G2D4 -- set tertiary charset G2 */
2581         case '+': /* G3D4 -- set quaternary charset G3 */
2582                 term.icharset = ascii - '(';
2583                 term.esc |= ESC_ALTCHARSET;
2584                 return 0;
2585         case 'D': /* IND -- Linefeed */
2586                 if(term.c.y == term.bot) {
2587                         tscrollup(term.top, 1);
2588                 } else {
2589                         tmoveto(term.c.x, term.c.y+1);
2590                 }
2591                 break;
2592         case 'E': /* NEL -- Next line */
2593                 tnewline(1); /* always go to first col */
2594                 break;
2595         case 'H': /* HTS -- Horizontal tab stop */
2596                 term.tabs[term.c.x] = 1;
2597                 break;
2598         case 'M': /* RI -- Reverse index */
2599                 if(term.c.y == term.top) {
2600                         tscrolldown(term.top, 1);
2601                 } else {
2602                         tmoveto(term.c.x, term.c.y-1);
2603                 }
2604                 break;
2605         case 'Z': /* DECID -- Identify Terminal */
2606                 ttywrite(vtiden, sizeof(vtiden) - 1);
2607                 break;
2608         case 'c': /* RIS -- Reset to inital state */
2609                 treset();
2610                 xresettitle();
2611                 xloadcols();
2612                 break;
2613         case '=': /* DECPAM -- Application keypad */
2614                 term.mode |= MODE_APPKEYPAD;
2615                 break;
2616         case '>': /* DECPNM -- Normal keypad */
2617                 term.mode &= ~MODE_APPKEYPAD;
2618                 break;
2619         case '7': /* DECSC -- Save Cursor */
2620                 tcursor(CURSOR_SAVE);
2621                 break;
2622         case '8': /* DECRC -- Restore Cursor */
2623                 tcursor(CURSOR_LOAD);
2624                 break;
2625         case '\\': /* ST -- String Terminator */
2626                 if(term.esc & ESC_STR_END)
2627                         strhandle();
2628                 break;
2629         default:
2630                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2631                         (uchar) ascii, isprint(ascii)? ascii:'.');
2632                 break;
2633         }
2634         return 1;
2635 }
2636
2637 void
2638 tputc(char *c, int len) {
2639         uchar ascii;
2640         bool control;
2641         long unicodep;
2642         int width;
2643         Glyph *gp;
2644
2645         if(len == 1) {
2646                 width = 1;
2647                 unicodep = ascii = *c;
2648         } else {
2649                 utf8decode(c, &unicodep, UTF_SIZ);
2650                 if ((width = wcwidth(unicodep)) == -1) {
2651                         c = "\357\277\275";     /* UTF_INVALID */
2652                         width = 1;
2653                 }
2654                 ascii = unicodep;
2655         }
2656
2657         if(IS_SET(MODE_PRINT))
2658                 tprinter(c, len);
2659         control = ISCONTROL(unicodep);
2660
2661         /*
2662          * STR sequence must be checked before anything else
2663          * because it uses all following characters until it
2664          * receives a ESC, a SUB, a ST or any other C1 control
2665          * character.
2666          */
2667         if(term.esc & ESC_STR) {
2668                 if(len == 1 &&
2669                    (ascii == '\a' || ascii == 030 ||
2670                     ascii == 032  || ascii == 033 ||
2671                     ISCONTROLC1(unicodep))) {
2672                         term.esc &= ~(ESC_START|ESC_STR);
2673                         term.esc |= ESC_STR_END;
2674                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2675                         memmove(&strescseq.buf[strescseq.len], c, len);
2676                         strescseq.len += len;
2677                         return;
2678                 } else {
2679                 /*
2680                  * Here is a bug in terminals. If the user never sends
2681                  * some code to stop the str or esc command, then st
2682                  * will stop responding. But this is better than
2683                  * silently failing with unknown characters. At least
2684                  * then users will report back.
2685                  *
2686                  * In the case users ever get fixed, here is the code:
2687                  */
2688                 /*
2689                  * term.esc = 0;
2690                  * strhandle();
2691                  */
2692                         return;
2693                 }
2694         }
2695
2696         /*
2697          * Actions of control codes must be performed as soon they arrive
2698          * because they can be embedded inside a control sequence, and
2699          * they must not cause conflicts with sequences.
2700          */
2701         if(control) {
2702                 tcontrolcode(ascii);
2703                 /*
2704                  * control codes are not shown ever
2705                  */
2706                 return;
2707         } else if(term.esc & ESC_START) {
2708                 if(term.esc & ESC_CSI) {
2709                         csiescseq.buf[csiescseq.len++] = ascii;
2710                         if(BETWEEN(ascii, 0x40, 0x7E)
2711                                         || csiescseq.len >= \
2712                                         sizeof(csiescseq.buf)-1) {
2713                                 term.esc = 0;
2714                                 csiparse();
2715                                 csihandle();
2716                         }
2717                         return;
2718                 } else if(term.esc & ESC_ALTCHARSET) {
2719                         tdeftran(ascii);
2720                 } else if(term.esc & ESC_TEST) {
2721                         tdectest(ascii);
2722                 } else {
2723                         if (!eschandle(ascii))
2724                                 return;
2725                         /* sequence already finished */
2726                 }
2727                 term.esc = 0;
2728                 /*
2729                  * All characters which form part of a sequence are not
2730                  * printed
2731                  */
2732                 return;
2733         }
2734         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2735                 selclear(NULL);
2736
2737         gp = &term.line[term.c.y][term.c.x];
2738         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2739                 gp->mode |= ATTR_WRAP;
2740                 tnewline(1);
2741                 gp = &term.line[term.c.y][term.c.x];
2742         }
2743
2744         if(IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2745                 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2746
2747         if(term.c.x+width > term.col) {
2748                 tnewline(1);
2749                 gp = &term.line[term.c.y][term.c.x];
2750         }
2751
2752         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2753
2754         if(width == 2) {
2755                 gp->mode |= ATTR_WIDE;
2756                 if(term.c.x+1 < term.col) {
2757                         gp[1].c[0] = '\0';
2758                         gp[1].mode = ATTR_WDUMMY;
2759                 }
2760         }
2761         if(term.c.x+width < term.col) {
2762                 tmoveto(term.c.x+width, term.c.y);
2763         } else {
2764                 term.c.state |= CURSOR_WRAPNEXT;
2765         }
2766 }
2767
2768 void
2769 tresize(int col, int row) {
2770         int i;
2771         int minrow = MIN(row, term.row);
2772         int mincol = MIN(col, term.col);
2773         bool *bp;
2774         TCursor c;
2775
2776         if(col < 1 || row < 1) {
2777                 fprintf(stderr,
2778                         "tresize: error resizing to %dx%d\n", col, row);
2779                 return;
2780         }
2781
2782         /*
2783          * slide screen to keep cursor where we expect it -
2784          * tscrollup would work here, but we can optimize to
2785          * memmove because we're freeing the earlier lines
2786          */
2787         for(i = 0; i <= term.c.y - row; i++) {
2788                 free(term.line[i]);
2789                 free(term.alt[i]);
2790         }
2791         memmove(term.line, term.line + i, row * sizeof(Line));
2792         memmove(term.alt, term.alt + i, row * sizeof(Line));
2793         for(i += row; i < term.row; i++) {
2794                 free(term.line[i]);
2795                 free(term.alt[i]);
2796         }
2797
2798         /* resize to new height */
2799         term.line = xrealloc(term.line, row * sizeof(Line));
2800         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2801         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2802         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2803
2804         /* resize each row to new width, zero-pad if needed */
2805         for(i = 0; i < minrow; i++) {
2806                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2807                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2808         }
2809
2810         /* allocate any new rows */
2811         for(/* i == minrow */; i < row; i++) {
2812                 term.line[i] = xmalloc(col * sizeof(Glyph));
2813                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2814         }
2815         if(col > term.col) {
2816                 bp = term.tabs + term.col;
2817
2818                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2819                 while(--bp > term.tabs && !*bp)
2820                         /* nothing */ ;
2821                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2822                         *bp = 1;
2823         }
2824         /* update terminal size */
2825         term.col = col;
2826         term.row = row;
2827         /* reset scrolling region */
2828         tsetscroll(0, row-1);
2829         /* make use of the LIMIT in tmoveto */
2830         tmoveto(term.c.x, term.c.y);
2831         /* Clearing both screens (it makes dirty all lines) */
2832         c = term.c;
2833         for(i = 0; i < 2; i++) {
2834                 if(mincol < col && 0 < minrow) {
2835                         tclearregion(mincol, 0, col - 1, minrow - 1);
2836                 }
2837                 if(0 < col && minrow < row) {
2838                         tclearregion(0, minrow, col - 1, row - 1);
2839                 }
2840                 tswapscreen();
2841                 tcursor(CURSOR_LOAD);
2842         }
2843         term.c = c;
2844 }
2845
2846 void
2847 xresize(int col, int row) {
2848         xw.tw = MAX(1, col * xw.cw);
2849         xw.th = MAX(1, row * xw.ch);
2850
2851         XFreePixmap(xw.dpy, xw.buf);
2852         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2853                         DefaultDepth(xw.dpy, xw.scr));
2854         XftDrawChange(xw.draw, xw.buf);
2855         xclear(0, 0, xw.w, xw.h);
2856 }
2857
2858 ushort
2859 sixd_to_16bit(int x) {
2860         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2861 }
2862
2863 void
2864 xloadcols(void) {
2865         int i;
2866         XRenderColor color = { .alpha = 0xffff };
2867         static bool loaded;
2868         Color *cp;
2869
2870         if(loaded) {
2871                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2872                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2873         }
2874
2875         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2876         for(i = 0; i < LEN(colorname); i++) {
2877                 if(!colorname[i])
2878                         continue;
2879                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2880                         die("Could not allocate color '%s'\n", colorname[i]);
2881                 }
2882         }
2883
2884         /* load colors [16-231] ; same colors as xterm */
2885         for(i = 16; i < 6*6*6+16; i++) {
2886                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2887                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2888                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2889                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2890                         die("Could not allocate color %d\n", i);
2891         }
2892
2893         /* load colors [232-255] ; grayscale */
2894         for(; i < 256; i++) {
2895                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2896                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2897                         die("Could not allocate color %d\n", i);
2898         }
2899         loaded = true;
2900 }
2901
2902 int
2903 xsetcolorname(int x, const char *name) {
2904         XRenderColor color = { .alpha = 0xffff };
2905         Color ncolor;
2906
2907         if(!BETWEEN(x, 0, LEN(colorname)))
2908                 return 1;
2909
2910         if(!name) {
2911                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2912                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2913                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2914                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2915                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2916                                                 xw.cmap, &color, &ncolor)) {
2917                                 return 1;
2918                         }
2919
2920                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2921                         dc.col[x] = ncolor;
2922                         return 0;
2923                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2924                         color.red = color.green = color.blue = \
2925                                     0x0808 + 0x0a0a * (x - (16 + 216));
2926                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2927                                                 xw.cmap, &color, &ncolor)) {
2928                                 return 1;
2929                         }
2930
2931                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2932                         dc.col[x] = ncolor;
2933                         return 0;
2934                 } else { /* system colors */
2935                         name = colorname[x];
2936                 }
2937         }
2938         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2939                 return 1;
2940
2941         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2942         dc.col[x] = ncolor;
2943         return 0;
2944 }
2945
2946 void
2947 xtermclear(int col1, int row1, int col2, int row2) {
2948         XftDrawRect(xw.draw,
2949                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2950                         borderpx + col1 * xw.cw,
2951                         borderpx + row1 * xw.ch,
2952                         (col2-col1+1) * xw.cw,
2953                         (row2-row1+1) * xw.ch);
2954 }
2955
2956 /*
2957  * Absolute coordinates.
2958  */
2959 void
2960 xclear(int x1, int y1, int x2, int y2) {
2961         XftDrawRect(xw.draw,
2962                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2963                         x1, y1, x2-x1, y2-y1);
2964 }
2965
2966 void
2967 xhints(void) {
2968         XClassHint class = {opt_class ? opt_class : termname, termname};
2969         XWMHints wm = {.flags = InputHint, .input = 1};
2970         XSizeHints *sizeh = NULL;
2971
2972         sizeh = XAllocSizeHints();
2973
2974         sizeh->flags = PSize | PResizeInc | PBaseSize;
2975         sizeh->height = xw.h;
2976         sizeh->width = xw.w;
2977         sizeh->height_inc = xw.ch;
2978         sizeh->width_inc = xw.cw;
2979         sizeh->base_height = 2 * borderpx;
2980         sizeh->base_width = 2 * borderpx;
2981         if(xw.isfixed == True) {
2982                 sizeh->flags |= PMaxSize | PMinSize;
2983                 sizeh->min_width = sizeh->max_width = xw.w;
2984                 sizeh->min_height = sizeh->max_height = xw.h;
2985         }
2986         if(xw.gm & (XValue|YValue)) {
2987                 sizeh->flags |= USPosition | PWinGravity;
2988                 sizeh->x = xw.l;
2989                 sizeh->y = xw.t;
2990                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2991         }
2992
2993         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2994                         &class);
2995         XFree(sizeh);
2996 }
2997
2998 int
2999 xgeommasktogravity(int mask) {
3000         switch(mask & (XNegative|YNegative)) {
3001         case 0:
3002                 return NorthWestGravity;
3003         case XNegative:
3004                 return NorthEastGravity;
3005         case YNegative:
3006                 return SouthWestGravity;
3007         }
3008         return SouthEastGravity;
3009 }
3010
3011 int
3012 xloadfont(Font *f, FcPattern *pattern) {
3013         FcPattern *match;
3014         FcResult result;
3015
3016         match = FcFontMatch(NULL, pattern, &result);
3017         if(!match)
3018                 return 1;
3019
3020         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
3021                 FcPatternDestroy(match);
3022                 return 1;
3023         }
3024
3025         f->set = NULL;
3026         f->pattern = FcPatternDuplicate(pattern);
3027
3028         f->ascent = f->match->ascent;
3029         f->descent = f->match->descent;
3030         f->lbearing = 0;
3031         f->rbearing = f->match->max_advance_width;
3032
3033         f->height = f->ascent + f->descent;
3034         f->width = f->lbearing + f->rbearing;
3035
3036         return 0;
3037 }
3038
3039 void
3040 xloadfonts(char *fontstr, double fontsize) {
3041         FcPattern *pattern;
3042         FcResult r_sz, r_psz;
3043         double fontval;
3044         float ceilf(float);
3045
3046         if(fontstr[0] == '-') {
3047                 pattern = XftXlfdParse(fontstr, False, False);
3048         } else {
3049                 pattern = FcNameParse((FcChar8 *)fontstr);
3050         }
3051
3052         if(!pattern)
3053                 die("st: can't open font %s\n", fontstr);
3054
3055         if(fontsize > 1) {
3056                 FcPatternDel(pattern, FC_PIXEL_SIZE);
3057                 FcPatternDel(pattern, FC_SIZE);
3058                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
3059                 usedfontsize = fontsize;
3060         } else {
3061                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
3062                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
3063                 if(r_psz == FcResultMatch) {
3064                         usedfontsize = fontval;
3065                 } else if(r_sz == FcResultMatch) {
3066                         usedfontsize = -1;
3067                 } else {
3068                         /*
3069                          * Default font size is 12, if none given. This is to
3070                          * have a known usedfontsize value.
3071                          */
3072                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3073                         usedfontsize = 12;
3074                 }
3075                 defaultfontsize = usedfontsize;
3076         }
3077
3078         FcConfigSubstitute(0, pattern, FcMatchPattern);
3079         FcDefaultSubstitute(pattern);
3080
3081         if(xloadfont(&dc.font, pattern))
3082                 die("st: can't open font %s\n", fontstr);
3083
3084         if(usedfontsize < 0) {
3085                 FcPatternGetDouble(dc.font.match->pattern,
3086                                    FC_PIXEL_SIZE, 0, &fontval);
3087                 usedfontsize = fontval;
3088                 if(fontsize == 0)
3089                         defaultfontsize = fontval;
3090         }
3091
3092         /* Setting character width and height. */
3093         xw.cw = ceilf(dc.font.width * cwscale);
3094         xw.ch = ceilf(dc.font.height * chscale);
3095
3096         FcPatternDel(pattern, FC_SLANT);
3097         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3098         if(xloadfont(&dc.ifont, pattern))
3099                 die("st: can't open font %s\n", fontstr);
3100
3101         FcPatternDel(pattern, FC_WEIGHT);
3102         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3103         if(xloadfont(&dc.ibfont, pattern))
3104                 die("st: can't open font %s\n", fontstr);
3105
3106         FcPatternDel(pattern, FC_SLANT);
3107         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3108         if(xloadfont(&dc.bfont, pattern))
3109                 die("st: can't open font %s\n", fontstr);
3110
3111         FcPatternDestroy(pattern);
3112 }
3113
3114 void
3115 xunloadfont(Font *f) {
3116         XftFontClose(xw.dpy, f->match);
3117         FcPatternDestroy(f->pattern);
3118         if(f->set)
3119                 FcFontSetDestroy(f->set);
3120 }
3121
3122 void
3123 xunloadfonts(void) {
3124         /* Free the loaded fonts in the font cache.  */
3125         while(frclen > 0)
3126                 XftFontClose(xw.dpy, frc[--frclen].font);
3127
3128         xunloadfont(&dc.font);
3129         xunloadfont(&dc.bfont);
3130         xunloadfont(&dc.ifont);
3131         xunloadfont(&dc.ibfont);
3132 }
3133
3134 void
3135 xzoom(const Arg *arg) {
3136         Arg larg;
3137
3138         larg.i = usedfontsize + arg->i;
3139         xzoomabs(&larg);
3140 }
3141
3142 void
3143 xzoomabs(const Arg *arg) {
3144         xunloadfonts();
3145         xloadfonts(usedfont, arg->i);
3146         cresize(0, 0);
3147         redraw();
3148         xhints();
3149 }
3150
3151 void
3152 xzoomreset(const Arg *arg) {
3153         Arg larg;
3154
3155         if(defaultfontsize > 0) {
3156                 larg.i = defaultfontsize;
3157                 xzoomabs(&larg);
3158         }
3159 }
3160
3161 void
3162 xinit(void) {
3163         XGCValues gcvalues;
3164         Cursor cursor;
3165         Window parent;
3166         pid_t thispid = getpid();
3167
3168         if(!(xw.dpy = XOpenDisplay(NULL)))
3169                 die("Can't open display\n");
3170         xw.scr = XDefaultScreen(xw.dpy);
3171         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3172
3173         /* font */
3174         if(!FcInit())
3175                 die("Could not init fontconfig.\n");
3176
3177         usedfont = (opt_font == NULL)? font : opt_font;
3178         xloadfonts(usedfont, 0);
3179
3180         /* colors */
3181         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3182         xloadcols();
3183
3184         /* adjust fixed window geometry */
3185         xw.w = 2 * borderpx + term.col * xw.cw;
3186         xw.h = 2 * borderpx + term.row * xw.ch;
3187         if(xw.gm & XNegative)
3188                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3189         if(xw.gm & YNegative)
3190                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3191
3192         /* Events */
3193         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3194         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3195         xw.attrs.bit_gravity = NorthWestGravity;
3196         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3197                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3198                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3199         xw.attrs.colormap = xw.cmap;
3200
3201         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3202                 parent = XRootWindow(xw.dpy, xw.scr);
3203         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3204                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3205                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3206                         | CWEventMask | CWColormap, &xw.attrs);
3207
3208         memset(&gcvalues, 0, sizeof(gcvalues));
3209         gcvalues.graphics_exposures = False;
3210         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3211                         &gcvalues);
3212         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3213                         DefaultDepth(xw.dpy, xw.scr));
3214         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3215         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3216
3217         /* Xft rendering context */
3218         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3219
3220         /* input methods */
3221         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3222                 XSetLocaleModifiers("@im=local");
3223                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3224                         XSetLocaleModifiers("@im=");
3225                         if((xw.xim = XOpenIM(xw.dpy,
3226                                         NULL, NULL, NULL)) == NULL) {
3227                                 die("XOpenIM failed. Could not open input"
3228                                         " device.\n");
3229                         }
3230                 }
3231         }
3232         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3233                                            | XIMStatusNothing, XNClientWindow, xw.win,
3234                                            XNFocusWindow, xw.win, NULL);
3235         if(xw.xic == NULL)
3236                 die("XCreateIC failed. Could not obtain input method.\n");
3237
3238         /* white cursor, black outline */
3239         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3240         XDefineCursor(xw.dpy, xw.win, cursor);
3241         XRecolorCursor(xw.dpy, cursor,
3242                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3243                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3244
3245         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3246         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3247         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3248         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3249
3250         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3251         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3252                         PropModeReplace, (uchar *)&thispid, 1);
3253
3254         xresettitle();
3255         XMapWindow(xw.dpy, xw.win);
3256         xhints();
3257         XSync(xw.dpy, False);
3258 }
3259
3260 void
3261 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3262         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3263             width = charlen * xw.cw, xp, i;
3264         int frcflags, charexists;
3265         int u8fl, u8fblen, u8cblen, doesexist;
3266         char *u8c, *u8fs;
3267         long unicodep;
3268         Font *font = &dc.font;
3269         FcResult fcres;
3270         FcPattern *fcpattern, *fontpattern;
3271         FcFontSet *fcsets[] = { NULL };
3272         FcCharSet *fccharset;
3273         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3274         XRenderColor colfg, colbg;
3275         XRectangle r;
3276         int oneatatime;
3277
3278         frcflags = FRC_NORMAL;
3279
3280         if(base.mode & ATTR_ITALIC) {
3281                 if(base.fg == defaultfg)
3282                         base.fg = defaultitalic;
3283                 font = &dc.ifont;
3284                 frcflags = FRC_ITALIC;
3285         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3286                 if(base.fg == defaultfg)
3287                         base.fg = defaultitalic;
3288                 font = &dc.ibfont;
3289                 frcflags = FRC_ITALICBOLD;
3290         } else if(base.mode & ATTR_UNDERLINE) {
3291                 if(base.fg == defaultfg)
3292                         base.fg = defaultunderline;
3293         }
3294
3295         if(IS_TRUECOL(base.fg)) {
3296                 colfg.alpha = 0xffff;
3297                 colfg.red = TRUERED(base.fg);
3298                 colfg.green = TRUEGREEN(base.fg);
3299                 colfg.blue = TRUEBLUE(base.fg);
3300                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3301                 fg = &truefg;
3302         } else {
3303                 fg = &dc.col[base.fg];
3304         }
3305
3306         if(IS_TRUECOL(base.bg)) {
3307                 colbg.alpha = 0xffff;
3308                 colbg.green = TRUEGREEN(base.bg);
3309                 colbg.red = TRUERED(base.bg);
3310                 colbg.blue = TRUEBLUE(base.bg);
3311                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3312                 bg = &truebg;
3313         } else {
3314                 bg = &dc.col[base.bg];
3315         }
3316
3317         if(base.mode & ATTR_BOLD) {
3318                 /*
3319                  * change basic system colors [0-7]
3320                  * to bright system colors [8-15]
3321                  */
3322                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3323                         fg = &dc.col[base.fg + 8];
3324
3325                 if(base.mode & ATTR_ITALIC) {
3326                         font = &dc.ibfont;
3327                         frcflags = FRC_ITALICBOLD;
3328                 } else {
3329                         font = &dc.bfont;
3330                         frcflags = FRC_BOLD;
3331                 }
3332         }
3333
3334         if(IS_SET(MODE_REVERSE)) {
3335                 if(fg == &dc.col[defaultfg]) {
3336                         fg = &dc.col[defaultbg];
3337                 } else {
3338                         colfg.red = ~fg->color.red;
3339                         colfg.green = ~fg->color.green;
3340                         colfg.blue = ~fg->color.blue;
3341                         colfg.alpha = fg->color.alpha;
3342                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3343                                         &revfg);
3344                         fg = &revfg;
3345                 }
3346
3347                 if(bg == &dc.col[defaultbg]) {
3348                         bg = &dc.col[defaultfg];
3349                 } else {
3350                         colbg.red = ~bg->color.red;
3351                         colbg.green = ~bg->color.green;
3352                         colbg.blue = ~bg->color.blue;
3353                         colbg.alpha = bg->color.alpha;
3354                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3355                                         &revbg);
3356                         bg = &revbg;
3357                 }
3358         }
3359
3360         if(base.mode & ATTR_REVERSE) {
3361                 temp = fg;
3362                 fg = bg;
3363                 bg = temp;
3364         }
3365
3366         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3367                 colfg.red = fg->color.red / 2;
3368                 colfg.green = fg->color.green / 2;
3369                 colfg.blue = fg->color.blue / 2;
3370                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3371                 fg = &revfg;
3372         }
3373
3374         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3375                 fg = bg;
3376
3377         if(base.mode & ATTR_INVISIBLE)
3378                 fg = bg;
3379
3380         /* Intelligent cleaning up of the borders. */
3381         if(x == 0) {
3382                 xclear(0, (y == 0)? 0 : winy, borderpx,
3383                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3384         }
3385         if(x + charlen >= term.col) {
3386                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3387                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3388         }
3389         if(y == 0)
3390                 xclear(winx, 0, winx + width, borderpx);
3391         if(y == term.row-1)
3392                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3393
3394         /* Clean up the region we want to draw to. */
3395         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3396
3397         /* Set the clip region because Xft is sometimes dirty. */
3398         r.x = 0;
3399         r.y = 0;
3400         r.height = xw.ch;
3401         r.width = width;
3402         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3403
3404         for(xp = winx; bytelen > 0;) {
3405                 /*
3406                  * Search for the range in the to be printed string of glyphs
3407                  * that are in the main font. Then print that range. If
3408                  * some glyph is found that is not in the font, do the
3409                  * fallback dance.
3410                  */
3411                 u8fs = s;
3412                 u8fblen = 0;
3413                 u8fl = 0;
3414                 oneatatime = font->width != xw.cw;
3415                 for(;;) {
3416                         u8c = s;
3417                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3418                         s += u8cblen;
3419                         bytelen -= u8cblen;
3420
3421                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3422                         if(doesexist) {
3423                                         u8fl++;
3424                                         u8fblen += u8cblen;
3425                                         if(!oneatatime && bytelen > 0)
3426                                                         continue;
3427                         }
3428
3429                         if(u8fl > 0) {
3430                                 XftDrawStringUtf8(xw.draw, fg,
3431                                                 font->match, xp,
3432                                                 winy + font->ascent,
3433                                                 (FcChar8 *)u8fs,
3434                                                 u8fblen);
3435                                 xp += xw.cw * u8fl;
3436                         }
3437                         break;
3438                 }
3439                 if(doesexist) {
3440                         if(oneatatime)
3441                                 continue;
3442                         break;
3443                 }
3444
3445                 /* Search the font cache. */
3446                 for(i = 0; i < frclen; i++) {
3447                         charexists = XftCharExists(xw.dpy, frc[i].font, unicodep);
3448                         /* Everything correct. */
3449                         if(charexists && frc[i].flags == frcflags)
3450                                 break;
3451                         /* We got a default font for a not found glyph. */
3452                         if(!charexists && frc[i].flags == frcflags \
3453                                         && frc[i].unicodep == unicodep) {
3454                                 break;
3455                         }
3456                 }
3457
3458                 /* Nothing was found. */
3459                 if(i >= frclen) {
3460                         if(!font->set)
3461                                 font->set = FcFontSort(0, font->pattern,
3462                                                        FcTrue, 0, &fcres);
3463                         fcsets[0] = font->set;
3464
3465                         /*
3466                          * Nothing was found in the cache. Now use
3467                          * some dozen of Fontconfig calls to get the
3468                          * font for one single character.
3469                          *
3470                          * Xft and fontconfig are design failures.
3471                          */
3472                         fcpattern = FcPatternDuplicate(font->pattern);
3473                         fccharset = FcCharSetCreate();
3474
3475                         FcCharSetAddChar(fccharset, unicodep);
3476                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3477                                         fccharset);
3478                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3479                                         FcTrue);
3480
3481                         FcConfigSubstitute(0, fcpattern,
3482                                         FcMatchPattern);
3483                         FcDefaultSubstitute(fcpattern);
3484
3485                         fontpattern = FcFontSetMatch(0, fcsets, 1,
3486                                         fcpattern, &fcres);
3487
3488                         /*
3489                          * Overwrite or create the new cache entry.
3490                          */
3491                         if(frclen >= LEN(frc)) {
3492                                 frclen = LEN(frc) - 1;
3493                                 XftFontClose(xw.dpy, frc[frclen].font);
3494                                 frc[frclen].unicodep = 0;
3495                         }
3496
3497                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3498                                         fontpattern);
3499                         frc[frclen].flags = frcflags;
3500                         frc[frclen].unicodep = unicodep;
3501
3502                         i = frclen;
3503                         frclen++;
3504
3505                         FcPatternDestroy(fcpattern);
3506                         FcCharSetDestroy(fccharset);
3507                 }
3508
3509                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3510                                 xp, winy + frc[i].font->ascent,
3511                                 (FcChar8 *)u8c, u8cblen);
3512
3513                 xp += xw.cw * wcwidth(unicodep);
3514         }
3515
3516         /*
3517          * This is how the loop above actually should be. Why does the
3518          * application have to care about font details?
3519          *
3520          * I have to repeat: Xft and Fontconfig are design failures.
3521          */
3522         /*
3523         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3524                         winy + font->ascent, (FcChar8 *)s, bytelen);
3525         */
3526
3527         if(base.mode & ATTR_UNDERLINE) {
3528                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3529                                 width, 1);
3530         }
3531
3532         if(base.mode & ATTR_STRUCK) {
3533                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3534                                 width, 1);
3535         }
3536
3537         /* Reset clip to none. */
3538         XftDrawSetClip(xw.draw, 0);
3539 }
3540
3541 void
3542 xdrawcursor(void) {
3543         static int oldx = 0, oldy = 0;
3544         int sl, width, curx;
3545         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3546
3547         LIMIT(oldx, 0, term.col-1);
3548         LIMIT(oldy, 0, term.row-1);
3549
3550         curx = term.c.x;
3551
3552         /* adjust position if in dummy */
3553         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3554                 oldx--;
3555         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3556                 curx--;
3557
3558         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3559
3560         /* remove the old cursor */
3561         sl = utf8len(term.line[oldy][oldx].c);
3562         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3563         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3564                         oldy, width, sl);
3565
3566         if(IS_SET(MODE_HIDE))
3567                 return;
3568
3569         /* draw the new one */
3570         if(xw.state & WIN_FOCUSED) {
3571                 switch (xw.cursor) {
3572                         case 0: /* Blinking Block */
3573                         case 1: /* Blinking Block (Default) */
3574                         case 2: /* Steady Block */
3575                                 if(IS_SET(MODE_REVERSE)) {
3576                                                 g.mode |= ATTR_REVERSE;
3577                                                 g.fg = defaultcs;
3578                                                 g.bg = defaultfg;
3579                                         }
3580
3581                                 sl = utf8len(g.c);
3582                                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3583                                         ? 2 : 1;
3584                                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3585                                 break;
3586                         case 3: /* Blinking Underline */
3587                         case 4: /* Steady Underline */
3588                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3589                                                 borderpx + curx * xw.cw,
3590                                                 borderpx + (term.c.y + 1) * xw.ch - cursorthickness,
3591                                                 xw.cw, cursorthickness);
3592                                 break;
3593                         case 5: /* Blinking bar */
3594                         case 6: /* Steady bar */
3595                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3596                                                 borderpx + curx * xw.cw,
3597                                                 borderpx + term.c.y * xw.ch,
3598                                                 cursorthickness, xw.ch);
3599                                 break;
3600                 }
3601         } else {
3602                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3603                                 borderpx + curx * xw.cw,
3604                                 borderpx + term.c.y * xw.ch,
3605                                 xw.cw - 1, 1);
3606                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3607                                 borderpx + curx * xw.cw,
3608                                 borderpx + term.c.y * xw.ch,
3609                                 1, xw.ch - 1);
3610                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3611                                 borderpx + (curx + 1) * xw.cw - 1,
3612                                 borderpx + term.c.y * xw.ch,
3613                                 1, xw.ch - 1);
3614                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3615                                 borderpx + curx * xw.cw,
3616                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3617                                 xw.cw, 1);
3618         }
3619         oldx = curx, oldy = term.c.y;
3620 }
3621
3622
3623 void
3624 xsettitle(char *p) {
3625         XTextProperty prop;
3626
3627         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3628                         &prop);
3629         XSetWMName(xw.dpy, xw.win, &prop);
3630         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3631         XFree(prop.value);
3632 }
3633
3634 void
3635 xresettitle(void) {
3636         xsettitle(opt_title ? opt_title : "st");
3637 }
3638
3639 void
3640 redraw(void) {
3641         tfulldirt();
3642         draw();
3643 }
3644
3645 void
3646 draw(void) {
3647         drawregion(0, 0, term.col, term.row);
3648         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3649                         xw.h, 0, 0);
3650         XSetForeground(xw.dpy, dc.gc,
3651                         dc.col[IS_SET(MODE_REVERSE)?
3652                                 defaultfg : defaultbg].pixel);
3653 }
3654
3655 void
3656 drawregion(int x1, int y1, int x2, int y2) {
3657         int ic, ib, x, y, ox, sl;
3658         Glyph base, new;
3659         char buf[DRAW_BUF_SIZ];
3660         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3661         long unicodep;
3662
3663         if(!(xw.state & WIN_VISIBLE))
3664                 return;
3665
3666         for(y = y1; y < y2; y++) {
3667                 if(!term.dirty[y])
3668                         continue;
3669
3670                 xtermclear(0, y, term.col, y);
3671                 term.dirty[y] = 0;
3672                 base = term.line[y][0];
3673                 ic = ib = ox = 0;
3674                 for(x = x1; x < x2; x++) {
3675                         new = term.line[y][x];
3676                         if(new.mode == ATTR_WDUMMY)
3677                                 continue;
3678                         if(ena_sel && selected(x, y))
3679                                 new.mode ^= ATTR_REVERSE;
3680                         if(ib > 0 && (ATTRCMP(base, new)
3681                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3682                                 xdraws(buf, base, ox, y, ic, ib);
3683                                 ic = ib = 0;
3684                         }
3685                         if(ib == 0) {
3686                                 ox = x;
3687                                 base = new;
3688                         }
3689
3690                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3691                         memcpy(buf+ib, new.c, sl);
3692                         ib += sl;
3693                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3694                 }
3695                 if(ib > 0)
3696                         xdraws(buf, base, ox, y, ic, ib);
3697         }
3698         xdrawcursor();
3699 }
3700
3701 void
3702 expose(XEvent *ev) {
3703         XExposeEvent *e = &ev->xexpose;
3704
3705         if(xw.state & WIN_REDRAW) {
3706                 if(!e->count)
3707                         xw.state &= ~WIN_REDRAW;
3708         }
3709         redraw();
3710 }
3711
3712 void
3713 visibility(XEvent *ev) {
3714         XVisibilityEvent *e = &ev->xvisibility;
3715
3716         if(e->state == VisibilityFullyObscured) {
3717                 xw.state &= ~WIN_VISIBLE;
3718         } else if(!(xw.state & WIN_VISIBLE)) {
3719                 /* need a full redraw for next Expose, not just a buf copy */
3720                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3721         }
3722 }
3723
3724 void
3725 unmap(XEvent *ev) {
3726         xw.state &= ~WIN_VISIBLE;
3727 }
3728
3729 void
3730 xsetpointermotion(int set) {
3731         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3732         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3733 }
3734
3735 void
3736 xseturgency(int add) {
3737         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3738
3739         MODBIT(h->flags, add, XUrgencyHint);
3740         XSetWMHints(xw.dpy, xw.win, h);
3741         XFree(h);
3742 }
3743
3744 void
3745 focus(XEvent *ev) {
3746         XFocusChangeEvent *e = &ev->xfocus;
3747
3748         if(e->mode == NotifyGrab)
3749                 return;
3750
3751         if(ev->type == FocusIn) {
3752                 XSetICFocus(xw.xic);
3753                 xw.state |= WIN_FOCUSED;
3754                 xseturgency(0);
3755                 if(IS_SET(MODE_FOCUS))
3756                         ttywrite("\033[I", 3);
3757         } else {
3758                 XUnsetICFocus(xw.xic);
3759                 xw.state &= ~WIN_FOCUSED;
3760                 if(IS_SET(MODE_FOCUS))
3761                         ttywrite("\033[O", 3);
3762         }
3763 }
3764
3765 bool
3766 match(uint mask, uint state) {
3767         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3768 }
3769
3770 void
3771 numlock(const Arg *dummy) {
3772         term.numlock ^= 1;
3773 }
3774
3775 char*
3776 kmap(KeySym k, uint state) {
3777         Key *kp;
3778         int i;
3779
3780         /* Check for mapped keys out of X11 function keys. */
3781         for(i = 0; i < LEN(mappedkeys); i++) {
3782                 if(mappedkeys[i] == k)
3783                         break;
3784         }
3785         if(i == LEN(mappedkeys)) {
3786                 if((k & 0xFFFF) < 0xFD00)
3787                         return NULL;
3788         }
3789
3790         for(kp = key; kp < key + LEN(key); kp++) {
3791                 if(kp->k != k)
3792                         continue;
3793
3794                 if(!match(kp->mask, state))
3795                         continue;
3796
3797                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3798                         continue;
3799                 if(term.numlock && kp->appkey == 2)
3800                         continue;
3801
3802                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3803                         continue;
3804
3805                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3806                         continue;
3807
3808                 return kp->s;
3809         }
3810
3811         return NULL;
3812 }
3813
3814 void
3815 kpress(XEvent *ev) {
3816         XKeyEvent *e = &ev->xkey;
3817         KeySym ksym;
3818         char buf[32], *customkey;
3819         int len;
3820         long c;
3821         Status status;
3822         Shortcut *bp;
3823
3824         if(IS_SET(MODE_KBDLOCK))
3825                 return;
3826
3827         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3828         /* 1. shortcuts */
3829         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3830                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3831                         bp->func(&(bp->arg));
3832                         return;
3833                 }
3834         }
3835
3836         /* 2. custom keys from config.h */
3837         if((customkey = kmap(ksym, e->state))) {
3838                 ttysend(customkey, strlen(customkey));
3839                 return;
3840         }
3841
3842         /* 3. composed string from input method */
3843         if(len == 0)
3844                 return;
3845         if(len == 1 && e->state & Mod1Mask) {
3846                 if(IS_SET(MODE_8BIT)) {
3847                         if(*buf < 0177) {
3848                                 c = *buf | 0x80;
3849                                 len = utf8encode(c, buf, UTF_SIZ);
3850                         }
3851                 } else {
3852                         buf[1] = buf[0];
3853                         buf[0] = '\033';
3854                         len = 2;
3855                 }
3856         }
3857         ttysend(buf, len);
3858 }
3859
3860
3861 void
3862 cmessage(XEvent *e) {
3863         /*
3864          * See xembed specs
3865          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3866          */
3867         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3868                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3869                         xw.state |= WIN_FOCUSED;
3870                         xseturgency(0);
3871                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3872                         xw.state &= ~WIN_FOCUSED;
3873                 }
3874         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3875                 /* Send SIGHUP to shell */
3876                 kill(pid, SIGHUP);
3877                 exit(EXIT_SUCCESS);
3878         }
3879 }
3880
3881 void
3882 cresize(int width, int height) {
3883         int col, row;
3884
3885         if(width != 0)
3886                 xw.w = width;
3887         if(height != 0)
3888                 xw.h = height;
3889
3890         col = (xw.w - 2 * borderpx) / xw.cw;
3891         row = (xw.h - 2 * borderpx) / xw.ch;
3892
3893         tresize(col, row);
3894         xresize(col, row);
3895         ttyresize();
3896 }
3897
3898 void
3899 resize(XEvent *e) {
3900         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3901                 return;
3902
3903         cresize(e->xconfigure.width, e->xconfigure.height);
3904 }
3905
3906 void
3907 run(void) {
3908         XEvent ev;
3909         int w = xw.w, h = xw.h;
3910         fd_set rfd;
3911         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3912         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3913         long deltatime;
3914
3915         /* Waiting for window mapping */
3916         do {
3917                 XNextEvent(xw.dpy, &ev);
3918                 if(ev.type == ConfigureNotify) {
3919                         w = ev.xconfigure.width;
3920                         h = ev.xconfigure.height;
3921                 }
3922         } while(ev.type != MapNotify);
3923
3924         ttynew();
3925         cresize(w, h);
3926
3927         clock_gettime(CLOCK_MONOTONIC, &last);
3928         lastblink = last;
3929
3930         for(xev = actionfps;;) {
3931                 FD_ZERO(&rfd);
3932                 FD_SET(cmdfd, &rfd);
3933                 FD_SET(xfd, &rfd);
3934
3935                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3936                         if(errno == EINTR)
3937                                 continue;
3938                         die("select failed: %s\n", strerror(errno));
3939                 }
3940                 if(FD_ISSET(cmdfd, &rfd)) {
3941                         ttyread();
3942                         if(blinktimeout) {
3943                                 blinkset = tattrset(ATTR_BLINK);
3944                                 if(!blinkset)
3945                                         MODBIT(term.mode, 0, MODE_BLINK);
3946                         }
3947                 }
3948
3949                 if(FD_ISSET(xfd, &rfd))
3950                         xev = actionfps;
3951
3952                 clock_gettime(CLOCK_MONOTONIC, &now);
3953                 drawtimeout.tv_sec = 0;
3954                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3955                 tv = &drawtimeout;
3956
3957                 dodraw = 0;
3958                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3959                         tsetdirtattr(ATTR_BLINK);
3960                         term.mode ^= MODE_BLINK;
3961                         lastblink = now;
3962                         dodraw = 1;
3963                 }
3964                 deltatime = TIMEDIFF(now, last);
3965                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3966                                 || deltatime < 0) {
3967                         dodraw = 1;
3968                         last = now;
3969                 }
3970
3971                 if(dodraw) {
3972                         while(XPending(xw.dpy)) {
3973                                 XNextEvent(xw.dpy, &ev);
3974                                 if(XFilterEvent(&ev, None))
3975                                         continue;
3976                                 if(handler[ev.type])
3977                                         (handler[ev.type])(&ev);
3978                         }
3979
3980                         draw();
3981                         XFlush(xw.dpy);
3982
3983                         if(xev && !FD_ISSET(xfd, &rfd))
3984                                 xev--;
3985                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3986                                 if(blinkset) {
3987                                         if(TIMEDIFF(now, lastblink) \
3988                                                         > blinktimeout) {
3989                                                 drawtimeout.tv_nsec = 1000;
3990                                         } else {
3991                                                 drawtimeout.tv_nsec = (1E6 * \
3992                                                         (blinktimeout - \
3993                                                         TIMEDIFF(now,
3994                                                                 lastblink)));
3995                                         }
3996                                         drawtimeout.tv_sec = \
3997                                             drawtimeout.tv_nsec / 1E9;
3998                                         drawtimeout.tv_nsec %= (long)1E9;
3999                                 } else {
4000                                         tv = NULL;
4001                                 }
4002                         }
4003                 }
4004         }
4005 }
4006
4007 void
4008 usage(void) {
4009         die("%s " VERSION " (c) 2010-2015 st engineers\n" \
4010         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4011         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
4012 }
4013
4014 int
4015 main(int argc, char *argv[]) {
4016         uint cols = 80, rows = 24;
4017
4018         xw.l = xw.t = 0;
4019         xw.isfixed = False;
4020         xw.cursor = 0;
4021
4022         ARGBEGIN {
4023         case 'a':
4024                 allowaltscreen = false;
4025                 break;
4026         case 'c':
4027                 opt_class = EARGF(usage());
4028                 break;
4029         case 'e':
4030                 /* eat all remaining arguments */
4031                 if(argc > 1) {
4032                         opt_cmd = &argv[1];
4033                         if(argv[1] != NULL && opt_title == NULL)
4034                                 opt_title = basename(xstrdup(argv[1]));
4035                 }
4036                 goto run;
4037         case 'f':
4038                 opt_font = EARGF(usage());
4039                 break;
4040         case 'g':
4041                 xw.gm = XParseGeometry(EARGF(usage()),
4042                                 &xw.l, &xw.t, &cols, &rows);
4043                 break;
4044         case 'i':
4045                 xw.isfixed = True;
4046                 break;
4047         case 'o':
4048                 opt_io = EARGF(usage());
4049                 break;
4050         case 't':
4051                 opt_title = EARGF(usage());
4052                 break;
4053         case 'w':
4054                 opt_embed = EARGF(usage());
4055                 break;
4056         case 'v':
4057         default:
4058                 usage();
4059         } ARGEND;
4060
4061 run:
4062         setlocale(LC_CTYPE, "");
4063         XSetLocaleModifiers("");
4064         tnew(MAX(cols, 1), MAX(rows, 1));
4065         xinit();
4066         selinit();
4067         run();
4068
4069         return 0;
4070 }
4071