st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/Xft/Xft.h>
  28 #include <fontconfig/fontconfig.h>
  29
  30 #include "arg.h"
  31
  32 char *argv0;
  33
  34 #define Glyph Glyph_
  35 #define Font Font_
  36 #define Draw XftDraw *
  37 #define Colour XftColor
  38 #define Colourmap Colormap
  39 #define Rectangle XRectangle
  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_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define SERRNO strerror(errno)
  69 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  70 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  71 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  72 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  73 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  74 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  75 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  76 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  77 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  78
  79 #define VT102ID "\033[?6c"
  80
  81 enum glyph_attribute {
  82         ATTR_NULL      = 0,
  83         ATTR_REVERSE   = 1,
  84         ATTR_UNDERLINE = 2,
  85         ATTR_BOLD      = 4,
  86         ATTR_GFX       = 8,
  87         ATTR_ITALIC    = 16,
  88         ATTR_BLINK     = 32,
  89         ATTR_WRAP      = 64,
  90 };
  91
  92 enum cursor_movement {
  93         CURSOR_SAVE,
  94         CURSOR_LOAD
  95 };
  96
  97 enum cursor_state {
  98         CURSOR_DEFAULT  = 0,
  99         CURSOR_WRAPNEXT = 1,
 100         CURSOR_ORIGIN   = 2
 101 };
 102
 103 enum term_mode {
 104         MODE_WRAP        = 1,
 105         MODE_INSERT      = 2,
 106         MODE_APPKEYPAD   = 4,
 107         MODE_ALTSCREEN   = 8,
 108         MODE_CRLF        = 16,
 109         MODE_MOUSEBTN    = 32,
 110         MODE_MOUSEMOTION = 64,
 111         MODE_MOUSE       = 32|64,
 112         MODE_REVERSE     = 128,
 113         MODE_KBDLOCK     = 256,
 114         MODE_HIDE        = 512,
 115         MODE_ECHO        = 1024,
 116         MODE_APPCURSOR   = 2048,
 117         MODE_MOUSESGR    = 4096,
 118         MODE_8BIT        = 8192,
 119         MODE_BLINK       = 16384,
 120         MODE_FBLINK      = 32768,
 121 };
 122
 123 enum escape_state {
 124         ESC_START      = 1,
 125         ESC_CSI = 2,
 126         ESC_STR = 4, /* DSC, OSC, PM, APC */
 127         ESC_ALTCHARSET = 8,
 128         ESC_STR_END    = 16, /* a final string was encountered */
 129         ESC_TEST       = 32, /* Enter in test mode */
 130 };
 131
 132 enum window_state {
 133         WIN_VISIBLE = 1,
 134         WIN_REDRAW  = 2,
 135         WIN_FOCUSED = 4
 136 };
 137
 138 enum selection_type {
 139         SEL_REGULAR = 1,
 140         SEL_RECTANGULAR = 2
 141 };
 142
 143 enum selection_snap {
 144         SNAP_WORD = 1,
 145         SNAP_LINE = 2
 146 };
 147
 148 /* bit macro */
 149 #undef B0
 150 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 151
 152 typedef unsigned char uchar;
 153 typedef unsigned int uint;
 154 typedef unsigned long ulong;
 155 typedef unsigned short ushort;
 156
 157 typedef struct {
 158         char c[UTF_SIZ];     /* character code */
 159         uchar mode;  /* attribute flags */
 160         ushort fg;   /* foreground  */
 161         ushort bg;   /* background  */
 162 } Glyph;
 163
 164 typedef Glyph *Line;
 165
 166 typedef struct {
 167         Glyph attr;      /* current char attributes */
 168         int x;
 169         int y;
 170         char state;
 171 } TCursor;
 172
 173 /* CSI Escape sequence structs */
 174 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 175 typedef struct {
 176         char buf[ESC_BUF_SIZ]; /* raw string */
 177         int len;               /* raw string length */
 178         char priv;
 179         int arg[ESC_ARG_SIZ];
 180         int narg;              /* nb of args */
 181         char mode;
 182 } CSIEscape;
 183
 184 /* STR Escape sequence structs */
 185 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 186 typedef struct {
 187         char type;           /* ESC type ... */
 188         char buf[STR_BUF_SIZ]; /* raw string */
 189         int len;               /* raw string length */
 190         char *args[STR_ARG_SIZ];
 191         int narg;             /* nb of args */
 192 } STREscape;
 193
 194 /* Internal representation of the screen */
 195 typedef struct {
 196         int row;        /* nb row */
 197         int col;        /* nb col */
 198         Line *line;     /* screen */
 199         Line *alt;      /* alternate screen */
 200         bool *dirty;    /* dirtyness of lines */
 201         TCursor c;      /* cursor */
 202         int top;        /* top    scroll limit */
 203         int bot;        /* bottom scroll limit */
 204         int mode;       /* terminal mode flags */
 205         int esc;        /* escape state flags */
 206         bool numlock;   /* lock numbers in keyboard */
 207         bool *tabs;
 208 } Term;
 209
 210 /* Purely graphic info */
 211 typedef struct {
 212         Display *dpy;
 213         Colourmap cmap;
 214         Window win;
 215         Drawable buf;
 216         Atom xembed, wmdeletewin;
 217         XIM xim;
 218         XIC xic;
 219         Draw draw;
 220         Visual *vis;
 221         int scr;
 222         bool isfixed; /* is fixed geometry? */
 223         int fx, fy, fw, fh; /* fixed geometry */
 224         int tw, th; /* tty width and height */
 225         int w, h; /* window width and height */
 226         int ch; /* char height */
 227         int cw; /* char width  */
 228         char state; /* focus, redraw, visible */
 229 } XWindow;
 230
 231 typedef struct {
 232         KeySym k;
 233         uint mask;
 234         char s[ESC_BUF_SIZ];
 235         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 236         signed char appkey;             /* application keypad */
 237         signed char appcursor;          /* application cursor */
 238         signed char crlf;               /* crlf mode          */
 239 } Key;
 240
 241 /* TODO: use better name for vars... */
 242 typedef struct {
 243         int mode;
 244         int type;
 245         int snap;
 246         int bx, by;
 247         int ex, ey;
 248         struct {
 249                 int x, y;
 250         } b, e;
 251         char *clip;
 252         Atom xtarget;
 253         bool alt;
 254         struct timeval tclick1;
 255         struct timeval tclick2;
 256 } Selection;
 257
 258 typedef union {
 259         int i;
 260         unsigned int ui;
 261         float f;
 262         const void *v;
 263 } Arg;
 264
 265 typedef struct {
 266         unsigned int mod;
 267         KeySym keysym;
 268         void (*func)(const Arg *);
 269         const Arg arg;
 270 } Shortcut;
 271
 272 /* function definitions used in config.h */
 273 static void clippaste(const Arg *);
 274 static void numlock(const Arg *);
 275 static void selpaste(const Arg *);
 276 static void xzoom(const Arg *);
 277
 278 /* Config.h for applying patches and the configuration. */
 279 #include "config.h"
 280
 281 /* Font structure */
 282 typedef struct {
 283         int height;
 284         int width;
 285         int ascent;
 286         int descent;
 287         short lbearing;
 288         short rbearing;
 289         XftFont *match;
 290         FcFontSet *set;
 291         FcPattern *pattern;
 292 } Font;
 293
 294 /* Drawing Context */
 295 typedef struct {
 296         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 297         Font font, bfont, ifont, ibfont;
 298         GC gc;
 299 } DC;
 300
 301 static void die(const char *, ...);
 302 static void draw(void);
 303 static void redraw(int);
 304 static void drawregion(int, int, int, int);
 305 static void execsh(void);
 306 static void sigchld(int);
 307 static void run(void);
 308
 309 static void csidump(void);
 310 static void csihandle(void);
 311 static void csiparse(void);
 312 static void csireset(void);
 313 static void strdump(void);
 314 static void strhandle(void);
 315 static void strparse(void);
 316 static void strreset(void);
 317
 318 static int tattrset(int);
 319 static void tclearregion(int, int, int, int);
 320 static void tcursor(int);
 321 static void tdeletechar(int);
 322 static void tdeleteline(int);
 323 static void tinsertblank(int);
 324 static void tinsertblankline(int);
 325 static void tmoveto(int, int);
 326 static void tmoveato(int x, int y);
 327 static void tnew(int, int);
 328 static void tnewline(int);
 329 static void tputtab(bool);
 330 static void tputc(char *, int);
 331 static void treset(void);
 332 static int tresize(int, int);
 333 static void tscrollup(int, int);
 334 static void tscrolldown(int, int);
 335 static void tsetattr(int*, int);
 336 static void tsetchar(char *, Glyph *, int, int);
 337 static void tsetscroll(int, int);
 338 static void tswapscreen(void);
 339 static void tsetdirt(int, int);
 340 static void tsetdirtattr(int);
 341 static void tsetmode(bool, bool, int *, int);
 342 static void tfulldirt(void);
 343 static void techo(char *, int);
 344
 345 static inline bool match(uint, uint);
 346 static void ttynew(void);
 347 static void ttyread(void);
 348 static void ttyresize(void);
 349 static void ttywrite(const char *, size_t);
 350
 351 static void xdraws(char *, Glyph, int, int, int, int);
 352 static void xhints(void);
 353 static void xclear(int, int, int, int);
 354 static void xdrawcursor(void);
 355 static void xinit(void);
 356 static void xloadcols(void);
 357 static int xsetcolorname(int, const char *);
 358 static int xloadfont(Font *, FcPattern *);
 359 static void xloadfonts(char *, int);
 360 static void xsettitle(char *);
 361 static void xresettitle(void);
 362 static void xseturgency(int);
 363 static void xsetsel(char*);
 364 static void xtermclear(int, int, int, int);
 365 static void xunloadfonts(void);
 366 static void xresize(int, int);
 367
 368 static void expose(XEvent *);
 369 static void visibility(XEvent *);
 370 static void unmap(XEvent *);
 371 static char *kmap(KeySym, uint);
 372 static void kpress(XEvent *);
 373 static void cmessage(XEvent *);
 374 static void cresize(int, int);
 375 static void resize(XEvent *);
 376 static void focus(XEvent *);
 377 static void brelease(XEvent *);
 378 static void bpress(XEvent *);
 379 static void bmotion(XEvent *);
 380 static void selnotify(XEvent *);
 381 static void selclear(XEvent *);
 382 static void selrequest(XEvent *);
 383
 384 static void selinit(void);
 385 static inline bool selected(int, int);
 386 static void selcopy(void);
 387 static void selscroll(int, int);
 388 static void selsnap(int, int *, int *, int);
 389
 390 static int utf8decode(char *, long *);
 391 static int utf8encode(long *, char *);
 392 static int utf8size(char *);
 393 static int isfullutf8(char *, int);
 394
 395 static ssize_t xwrite(int, char *, size_t);
 396 static void *xmalloc(size_t);
 397 static void *xrealloc(void *, size_t);
 398 static void *xcalloc(size_t, size_t);
 399
 400 static void (*handler[LASTEvent])(XEvent *) = {
 401         [KeyPress] = kpress,
 402         [ClientMessage] = cmessage,
 403         [ConfigureNotify] = resize,
 404         [VisibilityNotify] = visibility,
 405         [UnmapNotify] = unmap,
 406         [Expose] = expose,
 407         [FocusIn] = focus,
 408         [FocusOut] = focus,
 409         [MotionNotify] = bmotion,
 410         [ButtonPress] = bpress,
 411         [ButtonRelease] = brelease,
 412         [SelectionClear] = selclear,
 413         [SelectionNotify] = selnotify,
 414         [SelectionRequest] = selrequest,
 415 };
 416
 417 /* Globals */
 418 static DC dc;
 419 static XWindow xw;
 420 static Term term;
 421 static CSIEscape csiescseq;
 422 static STREscape strescseq;
 423 static int cmdfd;
 424 static pid_t pid;
 425 static Selection sel;
 426 static int iofd = -1;
 427 static char **opt_cmd = NULL;
 428 static char *opt_io = NULL;
 429 static char *opt_title = NULL;
 430 static char *opt_embed = NULL;
 431 static char *opt_class = NULL;
 432 static char *opt_font = NULL;
 433
 434 static char *usedfont = NULL;
 435 static int usedfontsize = 0;
 436
 437 /* Font Ring Cache */
 438 enum {
 439         FRC_NORMAL,
 440         FRC_ITALIC,
 441         FRC_BOLD,
 442         FRC_ITALICBOLD
 443 };
 444
 445 typedef struct {
 446         XftFont *font;
 447         long c;
 448         int flags;
 449 } Fontcache;
 450
 451 /*
 452  * Fontcache is a ring buffer, with frccur as current position and frclen as
 453  * the current length of used elements.
 454  */
 455
 456 static Fontcache frc[1024];
 457 static int frccur = -1, frclen = 0;
 458
 459 ssize_t
 460 xwrite(int fd, char *s, size_t len) {
 461         size_t aux = len;
 462
 463         while(len > 0) {
 464                 ssize_t r = write(fd, s, len);
 465                 if(r < 0)
 466                         return r;
 467                 len -= r;
 468                 s += r;
 469         }
 470         return aux;
 471 }
 472
 473 void *
 474 xmalloc(size_t len) {
 475         void *p = malloc(len);
 476
 477         if(!p)
 478                 die("Out of memory\n");
 479
 480         return p;
 481 }
 482
 483 void *
 484 xrealloc(void *p, size_t len) {
 485         if((p = realloc(p, len)) == NULL)
 486                 die("Out of memory\n");
 487
 488         return p;
 489 }
 490
 491 void *
 492 xcalloc(size_t nmemb, size_t size) {
 493         void *p = calloc(nmemb, size);
 494
 495         if(!p)
 496                 die("Out of memory\n");
 497
 498         return p;
 499 }
 500
 501 int
 502 utf8decode(char *s, long *u) {
 503         uchar c;
 504         int i, n, rtn;
 505
 506         rtn = 1;
 507         c = *s;
 508         if(~c & B7) { /* 0xxxxxxx */
 509                 *u = c;
 510                 return rtn;
 511         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 512                 *u = c&(B4|B3|B2|B1|B0);
 513                 n = 1;
 514         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 515                 *u = c&(B3|B2|B1|B0);
 516                 n = 2;
 517         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 518                 *u = c & (B2|B1|B0);
 519                 n = 3;
 520         } else {
 521                 goto invalid;
 522         }
 523
 524         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 525                 c = *s;
 526                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 527                         goto invalid;
 528                 *u <<= 6;
 529                 *u |= c & (B5|B4|B3|B2|B1|B0);
 530         }
 531
 532         if((n == 1 && *u < 0x80) ||
 533            (n == 2 && *u < 0x800) ||
 534            (n == 3 && *u < 0x10000) ||
 535            (*u >= 0xD800 && *u <= 0xDFFF)) {
 536                 goto invalid;
 537         }
 538
 539         return rtn;
 540 invalid:
 541         *u = 0xFFFD;
 542
 543         return rtn;
 544 }
 545
 546 int
 547 utf8encode(long *u, char *s) {
 548         uchar *sp;
 549         ulong uc;
 550         int i, n;
 551
 552         sp = (uchar *)s;
 553         uc = *u;
 554         if(uc < 0x80) {
 555                 *sp = uc; /* 0xxxxxxx */
 556                 return 1;
 557         } else if(*u < 0x800) {
 558                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 559                 n = 1;
 560         } else if(uc < 0x10000) {
 561                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 562                 n = 2;
 563         } else if(uc <= 0x10FFFF) {
 564                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 565                 n = 3;
 566         } else {
 567                 goto invalid;
 568         }
 569
 570         for(i=n,++sp; i>0; --i,++sp)
 571                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 572
 573         return n+1;
 574 invalid:
 575         /* U+FFFD */
 576         *s++ = '\xEF';
 577         *s++ = '\xBF';
 578         *s = '\xBD';
 579
 580         return 3;
 581 }
 582
 583 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 584    UTF-8 otherwise return 0 */
 585 int
 586 isfullutf8(char *s, int b) {
 587         uchar *c1, *c2, *c3;
 588
 589         c1 = (uchar *)s;
 590         c2 = (uchar *)++s;
 591         c3 = (uchar *)++s;
 592         if(b < 1) {
 593                 return 0;
 594         } else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1) {
 595                 return 0;
 596         } else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 597             ((b == 1) ||
 598             ((b == 2) && (*c2&(B7|B6)) == B7))) {
 599                 return 0;
 600         } else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 601             ((b == 1) ||
 602             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 603             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7))) {
 604                 return 0;
 605         } else {
 606                 return 1;
 607         }
 608 }
 609
 610 int
 611 utf8size(char *s) {
 612         uchar c = *s;
 613
 614         if(~c&B7) {
 615                 return 1;
 616         } else if((c&(B7|B6|B5)) == (B7|B6)) {
 617                 return 2;
 618         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) {
 619                 return 3;
 620         } else {
 621                 return 4;
 622         }
 623 }
 624
 625 void
 626 selinit(void) {
 627         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 628         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 629         sel.mode = 0;
 630         sel.bx = -1;
 631         sel.clip = NULL;
 632         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 633         if(sel.xtarget == None)
 634                 sel.xtarget = XA_STRING;
 635 }
 636
 637 static int
 638 x2col(int x) {
 639         x -= borderpx;
 640         x /= xw.cw;
 641
 642         return LIMIT(x, 0, term.col-1);
 643 }
 644
 645 static int
 646 y2row(int y) {
 647         y -= borderpx;
 648         y /= xw.ch;
 649
 650         return LIMIT(y, 0, term.row-1);
 651 }
 652
 653 static inline bool
 654 selected(int x, int y) {
 655         int bx, ex;
 656
 657         if(sel.ey == y && sel.by == y) {
 658                 bx = MIN(sel.bx, sel.ex);
 659                 ex = MAX(sel.bx, sel.ex);
 660
 661                 return BETWEEN(x, bx, ex);
 662         }
 663
 664         if(sel.type == SEL_RECTANGULAR) {
 665                 return ((sel.b.y <= y && y <= sel.e.y)
 666                         && (sel.b.x <= x && x <= sel.e.x));
 667         }
 668         return ((sel.b.y < y && y < sel.e.y)
 669                 || (y == sel.e.y && x <= sel.e.x))
 670                 || (y == sel.b.y && x >= sel.b.x
 671                         && (x <= sel.e.x || sel.b.y != sel.e.y));
 672 }
 673
 674 void
 675 selsnap(int mode, int *x, int *y, int direction) {
 676         switch(mode) {
 677         case SNAP_WORD:
 678                 while(*x > 0 && *x < term.col-1
 679                                 && term.line[*y][*x + direction].c[0] != ' ') {
 680                         *x += direction;
 681                 }
 682                 break;
 683         case SNAP_LINE:
 684                 *x = (direction < 0) ? 0 : term.col - 1;
 685                 break;
 686         default:
 687                 break;
 688         }
 689 }
 690
 691 void
 692 getbuttoninfo(XEvent *e) {
 693         int type;
 694         uint state = e->xbutton.state &~Button1Mask;
 695
 696         sel.alt = IS_SET(MODE_ALTSCREEN);
 697
 698         sel.ex = x2col(e->xbutton.x);
 699         sel.ey = y2row(e->xbutton.y);
 700
 701         if (sel.by < sel.ey
 702                         || (sel.by == sel.ey && sel.bx < sel.ex)) {
 703                 selsnap(sel.snap, &sel.bx, &sel.by, -1);
 704                 selsnap(sel.snap, &sel.ex, &sel.ey, +1);
 705         } else {
 706                 selsnap(sel.snap, &sel.ex, &sel.ey, -1);
 707                 selsnap(sel.snap, &sel.bx, &sel.by, +1);
 708         }
 709
 710         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 711         sel.b.y = MIN(sel.by, sel.ey);
 712         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 713         sel.e.y = MAX(sel.by, sel.ey);
 714
 715         sel.type = SEL_REGULAR;
 716         for(type = 1; type < LEN(selmasks); ++type) {
 717                 if(match(selmasks[type], state)) {
 718                         sel.type = type;
 719                         break;
 720                 }
 721         }
 722 }
 723
 724 void
 725 mousereport(XEvent *e) {
 726         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 727             button = e->xbutton.button, state = e->xbutton.state,
 728             len;
 729         char buf[40];
 730         static int ob, ox, oy;
 731
 732         /* from urxvt */
 733         if(e->xbutton.type == MotionNotify) {
 734                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 735                         return;
 736                 button = ob + 32;
 737                 ox = x, oy = y;
 738         } else if(!IS_SET(MODE_MOUSESGR)
 739                         && (e->xbutton.type == ButtonRelease
 740                                 || button == AnyButton)) {
 741                 button = 3;
 742         } else {
 743                 button -= Button1;
 744                 if(button >= 3)
 745                         button += 64 - 3;
 746                 if(e->xbutton.type == ButtonPress) {
 747                         ob = button;
 748                         ox = x, oy = y;
 749                 }
 750         }
 751
 752         button += (state & ShiftMask   ? 4  : 0)
 753                 + (state & Mod4Mask    ? 8  : 0)
 754                 + (state & ControlMask ? 16 : 0);
 755
 756         len = 0;
 757         if(IS_SET(MODE_MOUSESGR)) {
 758                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 759                                 button, x+1, y+1,
 760                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 761         } else if(x < 223 && y < 223) {
 762                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 763                                 32+button, 32+x+1, 32+y+1);
 764         } else {
 765                 return;
 766         }
 767
 768         ttywrite(buf, len);
 769 }
 770
 771 void
 772 bpress(XEvent *e) {
 773         struct timeval now;
 774
 775         if(IS_SET(MODE_MOUSE)) {
 776                 mousereport(e);
 777         } else if(e->xbutton.button == Button1) {
 778                 gettimeofday(&now, NULL);
 779
 780                 /* Clear previous selection, logically and visually. */
 781                 if(sel.bx != -1) {
 782                         sel.bx = -1;
 783                         tsetdirt(sel.b.y, sel.e.y);
 784                         draw();
 785                 }
 786                 sel.mode = 1;
 787                 sel.type = SEL_REGULAR;
 788                 sel.ex = sel.bx = x2col(e->xbutton.x);
 789                 sel.ey = sel.by = y2row(e->xbutton.y);
 790
 791                 /*
 792                  * If the user clicks below predefined timeouts specific
 793                  * snapping behaviour is exposed.
 794                  */
 795                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 796                         sel.snap = SNAP_LINE;
 797                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 798                         sel.snap = SNAP_WORD;
 799                 } else {
 800                         sel.snap = 0;
 801                 }
 802                 selsnap(sel.snap, &sel.bx, &sel.by, -1);
 803                 selsnap(sel.snap, &sel.ex, &sel.ey, 1);
 804                 sel.b.x = sel.bx;
 805                 sel.b.y = sel.by;
 806                 sel.e.x = sel.ex;
 807                 sel.e.y = sel.ey;
 808
 809                 /*
 810                  * Draw selection, unless it's regular and we don't want to
 811                  * make clicks visible
 812                  */
 813                 if(sel.snap != 0) {
 814                         sel.mode++;
 815                         tsetdirt(sel.b.y, sel.e.y);
 816                         draw();
 817                 }
 818                 sel.tclick2 = sel.tclick1;
 819                 sel.tclick1 = now;
 820         } else if(e->xbutton.button == Button4) {
 821                 ttywrite("\031", 1);
 822         } else if(e->xbutton.button == Button5) {
 823                 ttywrite("\005", 1);
 824         }
 825 }
 826
 827 void
 828 selcopy(void) {
 829         char *str, *ptr;
 830         int x, y, bufsize, size;
 831         Glyph *gp, *last;
 832
 833         if(sel.bx == -1) {
 834                 str = NULL;
 835         } else {
 836                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 837                 ptr = str = xmalloc(bufsize);
 838
 839                 /* append every set & selected glyph to the selection */
 840                 for(y = sel.b.y; y < sel.e.y + 1; y++) {
 841                         gp = &term.line[y][0];
 842                         last = gp + term.col;
 843
 844                         while(--last >= gp && !(selected(last - gp, y) && \
 845                                                 strcmp(last->c, " ") != 0))
 846                                 /* nothing */;
 847
 848                         for(x = 0; gp <= last; x++, ++gp) {
 849                                 if(!selected(x, y))
 850                                         continue;
 851
 852                                 size = utf8size(gp->c);
 853                                 memcpy(ptr, gp->c, size);
 854                                 ptr += size;
 855                         }
 856
 857                         /*
 858                          * Copy and pasting of line endings is inconsistent
 859                          * in the inconsistent terminal and GUI world.
 860                          * The best solution seems like to produce '\n' when
 861                          * something is copied from st and convert '\n' to
 862                          * '\r', when something to be pasted is received by
 863                          * st.
 864                          * FIXME: Fix the computer world.
 865                          */
 866                         if(y < sel.e.y && !((gp-1)->mode & ATTR_WRAP))
 867                                 *ptr++ = '\n';
 868                 }
 869                 *ptr = 0;
 870         }
 871         xsetsel(str);
 872 }
 873
 874 void
 875 selnotify(XEvent *e) {
 876         ulong nitems, ofs, rem;
 877         int format;
 878         uchar *data, *last, *repl;
 879         Atom type;
 880
 881         ofs = 0;
 882         do {
 883                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 884                                         False, AnyPropertyType, &type, &format,
 885                                         &nitems, &rem, &data)) {
 886                         fprintf(stderr, "Clipboard allocation failed\n");
 887                         return;
 888                 }
 889
 890                 /*
 891                  * As seen in selcopy:
 892                  * Line endings are inconsistent in the terminal and GUI world
 893                  * copy and pasting. When receiving some selection data,
 894                  * replace all '\n' with '\r'.
 895                  * FIXME: Fix the computer world.
 896                  */
 897                 repl = data;
 898                 last = data + nitems * format / 8;
 899                 while((repl = memchr(repl, '\n', last - repl))) {
 900                         *repl++ = '\r';
 901                 }
 902
 903                 ttywrite((const char *)data, nitems * format / 8);
 904                 XFree(data);
 905                 /* number of 32-bit chunks returned */
 906                 ofs += nitems * format / 32;
 907         } while(rem > 0);
 908 }
 909
 910 void
 911 selpaste(const Arg *dummy) {
 912         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
 913                         xw.win, CurrentTime);
 914 }
 915
 916 void
 917 clippaste(const Arg *dummy) {
 918         Atom clipboard;
 919
 920         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 921         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
 922                         xw.win, CurrentTime);
 923 }
 924
 925 void
 926 selclear(XEvent *e) {
 927         if(sel.bx == -1)
 928                 return;
 929         sel.bx = -1;
 930         tsetdirt(sel.b.y, sel.e.y);
 931 }
 932
 933 void
 934 selrequest(XEvent *e) {
 935         XSelectionRequestEvent *xsre;
 936         XSelectionEvent xev;
 937         Atom xa_targets, string;
 938
 939         xsre = (XSelectionRequestEvent *) e;
 940         xev.type = SelectionNotify;
 941         xev.requestor = xsre->requestor;
 942         xev.selection = xsre->selection;
 943         xev.target = xsre->target;
 944         xev.time = xsre->time;
 945         /* reject */
 946         xev.property = None;
 947
 948         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 949         if(xsre->target == xa_targets) {
 950                 /* respond with the supported type */
 951                 string = sel.xtarget;
 952                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 953                                 XA_ATOM, 32, PropModeReplace,
 954                                 (uchar *) &string, 1);
 955                 xev.property = xsre->property;
 956         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 957                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 958                                 xsre->target, 8, PropModeReplace,
 959                                 (uchar *) sel.clip, strlen(sel.clip));
 960                 xev.property = xsre->property;
 961         }
 962
 963         /* all done, send a notification to the listener */
 964         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 965                 fprintf(stderr, "Error sending SelectionNotify event\n");
 966 }
 967
 968 void
 969 xsetsel(char *str) {
 970         /* register the selection for both the clipboard and the primary */
 971         Atom clipboard;
 972
 973         free(sel.clip);
 974         sel.clip = str;
 975
 976         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 977
 978         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 979         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 980 }
 981
 982 void
 983 brelease(XEvent *e) {
 984         if(IS_SET(MODE_MOUSE)) {
 985                 mousereport(e);
 986                 return;
 987         }
 988
 989         if(e->xbutton.button == Button2) {
 990                 selpaste(NULL);
 991         } else if(e->xbutton.button == Button1) {
 992                 if(sel.mode < 2) {
 993                         sel.bx = -1;
 994                 } else {
 995                         getbuttoninfo(e);
 996                         selcopy();
 997                 }
 998                 sel.mode = 0;
 999                 term.dirty[sel.ey] = 1;
1000         }
1001 }
1002
1003 void
1004 bmotion(XEvent *e) {
1005         int oldey, oldex, oldsby, oldsey;
1006
1007         if(IS_SET(MODE_MOUSE)) {
1008                 mousereport(e);
1009                 return;
1010         }
1011
1012         if(!sel.mode)
1013                 return;
1014
1015         sel.mode++;
1016         oldey = sel.ey;
1017         oldex = sel.ex;
1018         oldsby = sel.b.y;
1019         oldsey = sel.e.y;
1020         getbuttoninfo(e);
1021
1022         if(oldey != sel.ey || oldex != sel.ex) {
1023                 tsetdirt(MIN(sel.b.y, oldsby), MAX(sel.e.y, oldsey));
1024         }
1025 }
1026
1027 void
1028 die(const char *errstr, ...) {
1029         va_list ap;
1030
1031         va_start(ap, errstr);
1032         vfprintf(stderr, errstr, ap);
1033         va_end(ap);
1034         exit(EXIT_FAILURE);
1035 }
1036
1037 void
1038 execsh(void) {
1039         char **args;
1040         char *envshell = getenv("SHELL");
1041         const struct passwd *pass = getpwuid(getuid());
1042         char buf[sizeof(long) * 8 + 1];
1043
1044         unsetenv("COLUMNS");
1045         unsetenv("LINES");
1046         unsetenv("TERMCAP");
1047
1048         if(pass) {
1049                 setenv("LOGNAME", pass->pw_name, 1);
1050                 setenv("USER", pass->pw_name, 1);
1051                 setenv("SHELL", pass->pw_shell, 0);
1052                 setenv("HOME", pass->pw_dir, 0);
1053         }
1054
1055         snprintf(buf, sizeof(buf), "%lu", xw.win);
1056         setenv("WINDOWID", buf, 1);
1057
1058         signal(SIGCHLD, SIG_DFL);
1059         signal(SIGHUP, SIG_DFL);
1060         signal(SIGINT, SIG_DFL);
1061         signal(SIGQUIT, SIG_DFL);
1062         signal(SIGTERM, SIG_DFL);
1063         signal(SIGALRM, SIG_DFL);
1064
1065         DEFAULT(envshell, shell);
1066         setenv("TERM", termname, 1);
1067         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1068         execvp(args[0], args);
1069         exit(EXIT_FAILURE);
1070 }
1071
1072 void
1073 sigchld(int a) {
1074         int stat = 0;
1075
1076         if(waitpid(pid, &stat, 0) < 0)
1077                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
1078
1079         if(WIFEXITED(stat)) {
1080                 exit(WEXITSTATUS(stat));
1081         } else {
1082                 exit(EXIT_FAILURE);
1083         }
1084 }
1085
1086 void
1087 ttynew(void) {
1088         int m, s;
1089         struct winsize w = {term.row, term.col, 0, 0};
1090
1091         /* seems to work fine on linux, openbsd and freebsd */
1092         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1093                 die("openpty failed: %s\n", SERRNO);
1094
1095         switch(pid = fork()) {
1096         case -1:
1097                 die("fork failed\n");
1098                 break;
1099         case 0:
1100                 setsid(); /* create a new process group */
1101                 dup2(s, STDIN_FILENO);
1102                 dup2(s, STDOUT_FILENO);
1103                 dup2(s, STDERR_FILENO);
1104                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1105                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
1106                 close(s);
1107                 close(m);
1108                 execsh();
1109                 break;
1110         default:
1111                 close(s);
1112                 cmdfd = m;
1113                 signal(SIGCHLD, sigchld);
1114                 if(opt_io) {
1115                         iofd = (!strcmp(opt_io, "-")) ?
1116                                   STDOUT_FILENO :
1117                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1118                         if(iofd < 0) {
1119                                 fprintf(stderr, "Error opening %s:%s\n",
1120                                         opt_io, strerror(errno));
1121                         }
1122                 }
1123         }
1124 }
1125
1126 void
1127 dump(char c) {
1128         static int col;
1129
1130         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1131         if(++col % 10 == 0)
1132                 fprintf(stderr, "\n");
1133 }
1134
1135 void
1136 ttyread(void) {
1137         static char buf[BUFSIZ];
1138         static int buflen = 0;
1139         char *ptr;
1140         char s[UTF_SIZ];
1141         int charsize; /* size of utf8 char in bytes */
1142         long utf8c;
1143         int ret;
1144
1145         /* append read bytes to unprocessed bytes */
1146         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1147                 die("Couldn't read from shell: %s\n", SERRNO);
1148
1149         /* process every complete utf8 char */
1150         buflen += ret;
1151         ptr = buf;
1152         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
1153                 charsize = utf8decode(ptr, &utf8c);
1154                 utf8encode(&utf8c, s);
1155                 tputc(s, charsize);
1156                 ptr += charsize;
1157                 buflen -= charsize;
1158         }
1159
1160         /* keep any uncomplete utf8 char for the next call */
1161         memmove(buf, ptr, buflen);
1162 }
1163
1164 void
1165 ttywrite(const char *s, size_t n) {
1166         if(write(cmdfd, s, n) == -1)
1167                 die("write error on tty: %s\n", SERRNO);
1168 }
1169
1170 void
1171 ttyresize(void) {
1172         struct winsize w;
1173
1174         w.ws_row = term.row;
1175         w.ws_col = term.col;
1176         w.ws_xpixel = xw.tw;
1177         w.ws_ypixel = xw.th;
1178         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1179                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
1180 }
1181
1182 int
1183 tattrset(int attr) {
1184         int i, j;
1185
1186         for(i = 0; i < term.row-1; i++) {
1187                 for(j = 0; j < term.col-1; j++) {
1188                         if(term.line[i][j].mode & attr)
1189                                 return 1;
1190                 }
1191         }
1192
1193         return 0;
1194 }
1195
1196 void
1197 tsetdirt(int top, int bot) {
1198         int i;
1199
1200         LIMIT(top, 0, term.row-1);
1201         LIMIT(bot, 0, term.row-1);
1202
1203         for(i = top; i <= bot; i++)
1204                 term.dirty[i] = 1;
1205 }
1206
1207 void
1208 tsetdirtattr(int attr) {
1209         int i, j;
1210
1211         for(i = 0; i < term.row-1; i++) {
1212                 for(j = 0; j < term.col-1; j++) {
1213                         if(term.line[i][j].mode & attr) {
1214                                 tsetdirt(i, i);
1215                                 break;
1216                         }
1217                 }
1218         }
1219 }
1220
1221 void
1222 tfulldirt(void) {
1223         tsetdirt(0, term.row-1);
1224 }
1225
1226 void
1227 tcursor(int mode) {
1228         static TCursor c;
1229
1230         if(mode == CURSOR_SAVE) {
1231                 c = term.c;
1232         } else if(mode == CURSOR_LOAD) {
1233                 term.c = c;
1234                 tmoveto(c.x, c.y);
1235         }
1236 }
1237
1238 void
1239 treset(void) {
1240         uint i;
1241
1242         term.c = (TCursor){{
1243                 .mode = ATTR_NULL,
1244                 .fg = defaultfg,
1245                 .bg = defaultbg
1246         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1247
1248         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1249         for(i = tabspaces; i < term.col; i += tabspaces)
1250                 term.tabs[i] = 1;
1251         term.top = 0;
1252         term.bot = term.row - 1;
1253         term.mode = MODE_WRAP;
1254
1255         tclearregion(0, 0, term.col-1, term.row-1);
1256         tmoveto(0, 0);
1257         tcursor(CURSOR_SAVE);
1258 }
1259
1260 void
1261 tnew(int col, int row) {
1262         memset(&term, 0, sizeof(Term));
1263         tresize(col, row);
1264         term.numlock = 1;
1265
1266         treset();
1267 }
1268
1269 void
1270 tswapscreen(void) {
1271         Line *tmp = term.line;
1272
1273         term.line = term.alt;
1274         term.alt = tmp;
1275         term.mode ^= MODE_ALTSCREEN;
1276         tfulldirt();
1277 }
1278
1279 void
1280 tscrolldown(int orig, int n) {
1281         int i;
1282         Line temp;
1283
1284         LIMIT(n, 0, term.bot-orig+1);
1285
1286         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1287
1288         for(i = term.bot; i >= orig+n; i--) {
1289                 temp = term.line[i];
1290                 term.line[i] = term.line[i-n];
1291                 term.line[i-n] = temp;
1292
1293                 term.dirty[i] = 1;
1294                 term.dirty[i-n] = 1;
1295         }
1296
1297         selscroll(orig, n);
1298 }
1299
1300 void
1301 tscrollup(int orig, int n) {
1302         int i;
1303         Line temp;
1304         LIMIT(n, 0, term.bot-orig+1);
1305
1306         tclearregion(0, orig, term.col-1, orig+n-1);
1307
1308         for(i = orig; i <= term.bot-n; i++) {
1309                  temp = term.line[i];
1310                  term.line[i] = term.line[i+n];
1311                  term.line[i+n] = temp;
1312
1313                  term.dirty[i] = 1;
1314                  term.dirty[i+n] = 1;
1315         }
1316
1317         selscroll(orig, -n);
1318 }
1319
1320 void
1321 selscroll(int orig, int n) {
1322         if(sel.bx == -1)
1323                 return;
1324
1325         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1326                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1327                         sel.bx = -1;
1328                         return;
1329                 }
1330                 if(sel.type == SEL_RECTANGULAR) {
1331                         if(sel.by < term.top)
1332                                 sel.by = term.top;
1333                         if(sel.ey > term.bot)
1334                                 sel.ey = term.bot;
1335                 } else {
1336                         if(sel.by < term.top) {
1337                                 sel.by = term.top;
1338                                 sel.bx = 0;
1339                         }
1340                         if(sel.ey > term.bot) {
1341                                 sel.ey = term.bot;
1342                                 sel.ex = term.col;
1343                         }
1344                 }
1345                 sel.b.y = sel.by, sel.b.x = sel.bx;
1346                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1347         }
1348 }
1349
1350 void
1351 tnewline(int first_col) {
1352         int y = term.c.y;
1353
1354         if(y == term.bot) {
1355                 tscrollup(term.top, 1);
1356         } else {
1357                 y++;
1358         }
1359         tmoveto(first_col ? 0 : term.c.x, y);
1360 }
1361
1362 void
1363 csiparse(void) {
1364         char *p = csiescseq.buf, *np;
1365         long int v;
1366
1367         csiescseq.narg = 0;
1368         if(*p == '?') {
1369                 csiescseq.priv = 1;
1370                 p++;
1371         }
1372
1373         csiescseq.buf[csiescseq.len] = '\0';
1374         while(p < csiescseq.buf+csiescseq.len) {
1375                 np = NULL;
1376                 v = strtol(p, &np, 10);
1377                 if(np == p)
1378                         v = 0;
1379                 if(v == LONG_MAX || v == LONG_MIN)
1380                         v = -1;
1381                 csiescseq.arg[csiescseq.narg++] = v;
1382                 p = np;
1383                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1384                         break;
1385                 p++;
1386         }
1387         csiescseq.mode = *p;
1388 }
1389
1390 /* for absolute user moves, when decom is set */
1391 void
1392 tmoveato(int x, int y) {
1393         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1394 }
1395
1396 void
1397 tmoveto(int x, int y) {
1398         int miny, maxy;
1399
1400         if(term.c.state & CURSOR_ORIGIN) {
1401                 miny = term.top;
1402                 maxy = term.bot;
1403         } else {
1404                 miny = 0;
1405                 maxy = term.row - 1;
1406         }
1407         LIMIT(x, 0, term.col-1);
1408         LIMIT(y, miny, maxy);
1409         term.c.state &= ~CURSOR_WRAPNEXT;
1410         term.c.x = x;
1411         term.c.y = y;
1412 }
1413
1414 void
1415 tsetchar(char *c, Glyph *attr, int x, int y) {
1416         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1417                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1418                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1419                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1420                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1421                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1422                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1423                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1424                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1425         };
1426
1427         /*
1428          * The table is proudly stolen from rxvt.
1429          */
1430         if(attr->mode & ATTR_GFX) {
1431                 if(c[0] >= 0x41 && c[0] <= 0x7e
1432                                 && vt100_0[c[0] - 0x41]) {
1433                         c = vt100_0[c[0] - 0x41];
1434                 }
1435         }
1436
1437         term.dirty[y] = 1;
1438         term.line[y][x] = *attr;
1439         memcpy(term.line[y][x].c, c, UTF_SIZ);
1440 }
1441
1442 void
1443 tclearregion(int x1, int y1, int x2, int y2) {
1444         int x, y, temp;
1445
1446         if(x1 > x2)
1447                 temp = x1, x1 = x2, x2 = temp;
1448         if(y1 > y2)
1449                 temp = y1, y1 = y2, y2 = temp;
1450
1451         LIMIT(x1, 0, term.col-1);
1452         LIMIT(x2, 0, term.col-1);
1453         LIMIT(y1, 0, term.row-1);
1454         LIMIT(y2, 0, term.row-1);
1455
1456         for(y = y1; y <= y2; y++) {
1457                 term.dirty[y] = 1;
1458                 for(x = x1; x <= x2; x++) {
1459                         if(selected(x, y))
1460                                 selclear(NULL);
1461                         term.line[y][x] = term.c.attr;
1462                         memcpy(term.line[y][x].c, " ", 2);
1463                 }
1464         }
1465 }
1466
1467 void
1468 tdeletechar(int n) {
1469         int src = term.c.x + n;
1470         int dst = term.c.x;
1471         int size = term.col - src;
1472
1473         term.dirty[term.c.y] = 1;
1474
1475         if(src >= term.col) {
1476                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1477                 return;
1478         }
1479
1480         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1481                         size * sizeof(Glyph));
1482         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1483 }
1484
1485 void
1486 tinsertblank(int n) {
1487         int src = term.c.x;
1488         int dst = src + n;
1489         int size = term.col - dst;
1490
1491         term.dirty[term.c.y] = 1;
1492
1493         if(dst >= term.col) {
1494                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1495                 return;
1496         }
1497
1498         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1499                         size * sizeof(Glyph));
1500         tclearregion(src, term.c.y, dst - 1, term.c.y);
1501 }
1502
1503 void
1504 tinsertblankline(int n) {
1505         if(term.c.y < term.top || term.c.y > term.bot)
1506                 return;
1507
1508         tscrolldown(term.c.y, n);
1509 }
1510
1511 void
1512 tdeleteline(int n) {
1513         if(term.c.y < term.top || term.c.y > term.bot)
1514                 return;
1515
1516         tscrollup(term.c.y, n);
1517 }
1518
1519 void
1520 tsetattr(int *attr, int l) {
1521         int i;
1522
1523         for(i = 0; i < l; i++) {
1524                 switch(attr[i]) {
1525                 case 0:
1526                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1527                                         | ATTR_BOLD | ATTR_ITALIC \
1528                                         | ATTR_BLINK);
1529                         term.c.attr.fg = defaultfg;
1530                         term.c.attr.bg = defaultbg;
1531                         break;
1532                 case 1:
1533                         term.c.attr.mode |= ATTR_BOLD;
1534                         break;
1535                 case 3:
1536                         term.c.attr.mode |= ATTR_ITALIC;
1537                         break;
1538                 case 4:
1539                         term.c.attr.mode |= ATTR_UNDERLINE;
1540                         break;
1541                 case 5: /* slow blink */
1542                 case 6: /* rapid blink */
1543                         term.c.attr.mode |= ATTR_BLINK;
1544                         break;
1545                 case 7:
1546                         term.c.attr.mode |= ATTR_REVERSE;
1547                         break;
1548                 case 21:
1549                 case 22:
1550                         term.c.attr.mode &= ~ATTR_BOLD;
1551                         break;
1552                 case 23:
1553                         term.c.attr.mode &= ~ATTR_ITALIC;
1554                         break;
1555                 case 24:
1556                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1557                         break;
1558                 case 25:
1559                 case 26:
1560                         term.c.attr.mode &= ~ATTR_BLINK;
1561                         break;
1562                 case 27:
1563                         term.c.attr.mode &= ~ATTR_REVERSE;
1564                         break;
1565                 case 38:
1566                         if(i + 2 < l && attr[i + 1] == 5) {
1567                                 i += 2;
1568                                 if(BETWEEN(attr[i], 0, 255)) {
1569                                         term.c.attr.fg = attr[i];
1570                                 } else {
1571                                         fprintf(stderr,
1572                                                 "erresc: bad fgcolor %d\n",
1573                                                 attr[i]);
1574                                 }
1575                         } else {
1576                                 fprintf(stderr,
1577                                         "erresc(38): gfx attr %d unknown\n",
1578                                         attr[i]);
1579                         }
1580                         break;
1581                 case 39:
1582                         term.c.attr.fg = defaultfg;
1583                         break;
1584                 case 48:
1585                         if(i + 2 < l && attr[i + 1] == 5) {
1586                                 i += 2;
1587                                 if(BETWEEN(attr[i], 0, 255)) {
1588                                         term.c.attr.bg = attr[i];
1589                                 } else {
1590                                         fprintf(stderr,
1591                                                 "erresc: bad bgcolor %d\n",
1592                                                 attr[i]);
1593                                 }
1594                         } else {
1595                                 fprintf(stderr,
1596                                         "erresc(48): gfx attr %d unknown\n",
1597                                         attr[i]);
1598                         }
1599                         break;
1600                 case 49:
1601                         term.c.attr.bg = defaultbg;
1602                         break;
1603                 default:
1604                         if(BETWEEN(attr[i], 30, 37)) {
1605                                 term.c.attr.fg = attr[i] - 30;
1606                         } else if(BETWEEN(attr[i], 40, 47)) {
1607                                 term.c.attr.bg = attr[i] - 40;
1608                         } else if(BETWEEN(attr[i], 90, 97)) {
1609                                 term.c.attr.fg = attr[i] - 90 + 8;
1610                         } else if(BETWEEN(attr[i], 100, 107)) {
1611                                 term.c.attr.bg = attr[i] - 100 + 8;
1612                         } else {
1613                                 fprintf(stderr,
1614                                         "erresc(default): gfx attr %d unknown\n",
1615                                         attr[i]), csidump();
1616                         }
1617                         break;
1618                 }
1619         }
1620 }
1621
1622 void
1623 tsetscroll(int t, int b) {
1624         int temp;
1625
1626         LIMIT(t, 0, term.row-1);
1627         LIMIT(b, 0, term.row-1);
1628         if(t > b) {
1629                 temp = t;
1630                 t = b;
1631                 b = temp;
1632         }
1633         term.top = t;
1634         term.bot = b;
1635 }
1636
1637 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1638
1639 void
1640 tsetmode(bool priv, bool set, int *args, int narg) {
1641         int *lim, mode;
1642         bool alt;
1643
1644         for(lim = args + narg; args < lim; ++args) {
1645                 if(priv) {
1646                         switch(*args) {
1647                                 break;
1648                         case 1: /* DECCKM -- Cursor key */
1649                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1650                                 break;
1651                         case 5: /* DECSCNM -- Reverse video */
1652                                 mode = term.mode;
1653                                 MODBIT(term.mode, set, MODE_REVERSE);
1654                                 if(mode != term.mode)
1655                                         redraw(REDRAW_TIMEOUT);
1656                                 break;
1657                         case 6: /* DECOM -- Origin */
1658                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1659                                 tmoveato(0, 0);
1660                                 break;
1661                         case 7: /* DECAWM -- Auto wrap */
1662                                 MODBIT(term.mode, set, MODE_WRAP);
1663                                 break;
1664                         case 0:  /* Error (IGNORED) */
1665                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1666                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1667                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1668                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1669                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1670                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1671                         case 42: /* DECNRCM -- National characters (IGNORED) */
1672                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1673                                 break;
1674                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1675                                 MODBIT(term.mode, !set, MODE_HIDE);
1676                                 break;
1677                         case 1000: /* 1000,1002: enable xterm mouse report */
1678                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1679                                 MODBIT(term.mode, 0, MODE_MOUSEMOTION);
1680                                 break;
1681                         case 1002:
1682                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1683                                 MODBIT(term.mode, 0, MODE_MOUSEBTN);
1684                                 break;
1685                         case 1006:
1686                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1687                                 break;
1688                         case 1034:
1689                                 MODBIT(term.mode, set, MODE_8BIT);
1690                                 break;
1691                         case 1049: /* = 1047 and 1048 */
1692                         case 47:
1693                         case 1047:
1694                                 if (!allowaltscreen)
1695                                         break;
1696
1697                                 alt = IS_SET(MODE_ALTSCREEN);
1698                                 if(alt) {
1699                                         tclearregion(0, 0, term.col-1,
1700                                                         term.row-1);
1701                                 }
1702                                 if(set ^ alt)           /* set is always 1 or 0 */
1703                                         tswapscreen();
1704                                 if(*args != 1049)
1705                                         break;
1706                                 /* FALLTRU */
1707                         case 1048:
1708                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1709                                 break;
1710                         default:
1711                                 fprintf(stderr,
1712                                         "erresc: unknown private set/reset mode %d\n",
1713                                         *args);
1714                                 break;
1715                         }
1716                 } else {
1717                         switch(*args) {
1718                         case 0:  /* Error (IGNORED) */
1719                                 break;
1720                         case 2:  /* KAM -- keyboard action */
1721                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1722                                 break;
1723                         case 4:  /* IRM -- Insertion-replacement */
1724                                 MODBIT(term.mode, set, MODE_INSERT);
1725                                 break;
1726                         case 12: /* SRM -- Send/Receive */
1727                                 MODBIT(term.mode, !set, MODE_ECHO);
1728                                 break;
1729                         case 20: /* LNM -- Linefeed/new line */
1730                                 MODBIT(term.mode, set, MODE_CRLF);
1731                                 break;
1732                         default:
1733                                 fprintf(stderr,
1734                                         "erresc: unknown set/reset mode %d\n",
1735                                         *args);
1736                                 break;
1737                         }
1738                 }
1739         }
1740 }
1741 #undef MODBIT
1742
1743
1744 void
1745 csihandle(void) {
1746         switch(csiescseq.mode) {
1747         default:
1748         unknown:
1749                 fprintf(stderr, "erresc: unknown csi ");
1750                 csidump();
1751                 /* die(""); */
1752                 break;
1753         case '@': /* ICH -- Insert <n> blank char */
1754                 DEFAULT(csiescseq.arg[0], 1);
1755                 tinsertblank(csiescseq.arg[0]);
1756                 break;
1757         case 'A': /* CUU -- Cursor <n> Up */
1758                 DEFAULT(csiescseq.arg[0], 1);
1759                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1760                 break;
1761         case 'B': /* CUD -- Cursor <n> Down */
1762         case 'e': /* VPR --Cursor <n> Down */
1763                 DEFAULT(csiescseq.arg[0], 1);
1764                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1765                 break;
1766         case 'c': /* DA -- Device Attributes */
1767                 if(csiescseq.arg[0] == 0)
1768                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1769                 break;
1770         case 'C': /* CUF -- Cursor <n> Forward */
1771         case 'a': /* HPR -- Cursor <n> Forward */
1772                 DEFAULT(csiescseq.arg[0], 1);
1773                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1774                 break;
1775         case 'D': /* CUB -- Cursor <n> Backward */
1776                 DEFAULT(csiescseq.arg[0], 1);
1777                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1778                 break;
1779         case 'E': /* CNL -- Cursor <n> Down and first col */
1780                 DEFAULT(csiescseq.arg[0], 1);
1781                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1782                 break;
1783         case 'F': /* CPL -- Cursor <n> Up and first col */
1784                 DEFAULT(csiescseq.arg[0], 1);
1785                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1786                 break;
1787         case 'g': /* TBC -- Tabulation clear */
1788                 switch(csiescseq.arg[0]) {
1789                 case 0: /* clear current tab stop */
1790                         term.tabs[term.c.x] = 0;
1791                         break;
1792                 case 3: /* clear all the tabs */
1793                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1794                         break;
1795                 default:
1796                         goto unknown;
1797                 }
1798                 break;
1799         case 'G': /* CHA -- Move to <col> */
1800         case '`': /* HPA */
1801                 DEFAULT(csiescseq.arg[0], 1);
1802                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1803                 break;
1804         case 'H': /* CUP -- Move to <row> <col> */
1805         case 'f': /* HVP */
1806                 DEFAULT(csiescseq.arg[0], 1);
1807                 DEFAULT(csiescseq.arg[1], 1);
1808                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1809                 break;
1810         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1811                 DEFAULT(csiescseq.arg[0], 1);
1812                 while(csiescseq.arg[0]--)
1813                         tputtab(1);
1814                 break;
1815         case 'J': /* ED -- Clear screen */
1816                 sel.bx = -1;
1817                 switch(csiescseq.arg[0]) {
1818                 case 0: /* below */
1819                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1820                         if(term.c.y < term.row-1) {
1821                                 tclearregion(0, term.c.y+1, term.col-1,
1822                                                 term.row-1);
1823                         }
1824                         break;
1825                 case 1: /* above */
1826                         if(term.c.y > 1)
1827                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1828                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1829                         break;
1830                 case 2: /* all */
1831                         tclearregion(0, 0, term.col-1, term.row-1);
1832                         break;
1833                 default:
1834                         goto unknown;
1835                 }
1836                 break;
1837         case 'K': /* EL -- Clear line */
1838                 switch(csiescseq.arg[0]) {
1839                 case 0: /* right */
1840                         tclearregion(term.c.x, term.c.y, term.col-1,
1841                                         term.c.y);
1842                         break;
1843                 case 1: /* left */
1844                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1845                         break;
1846                 case 2: /* all */
1847                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1848                         break;
1849                 }
1850                 break;
1851         case 'S': /* SU -- Scroll <n> line up */
1852                 DEFAULT(csiescseq.arg[0], 1);
1853                 tscrollup(term.top, csiescseq.arg[0]);
1854                 break;
1855         case 'T': /* SD -- Scroll <n> line down */
1856                 DEFAULT(csiescseq.arg[0], 1);
1857                 tscrolldown(term.top, csiescseq.arg[0]);
1858                 break;
1859         case 'L': /* IL -- Insert <n> blank lines */
1860                 DEFAULT(csiescseq.arg[0], 1);
1861                 tinsertblankline(csiescseq.arg[0]);
1862                 break;
1863         case 'l': /* RM -- Reset Mode */
1864                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1865                 break;
1866         case 'M': /* DL -- Delete <n> lines */
1867                 DEFAULT(csiescseq.arg[0], 1);
1868                 tdeleteline(csiescseq.arg[0]);
1869                 break;
1870         case 'X': /* ECH -- Erase <n> char */
1871                 DEFAULT(csiescseq.arg[0], 1);
1872                 tclearregion(term.c.x, term.c.y,
1873                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
1874                 break;
1875         case 'P': /* DCH -- Delete <n> char */
1876                 DEFAULT(csiescseq.arg[0], 1);
1877                 tdeletechar(csiescseq.arg[0]);
1878                 break;
1879         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1880                 DEFAULT(csiescseq.arg[0], 1);
1881                 while(csiescseq.arg[0]--)
1882                         tputtab(0);
1883                 break;
1884         case 'd': /* VPA -- Move to <row> */
1885                 DEFAULT(csiescseq.arg[0], 1);
1886                 tmoveato(term.c.x, csiescseq.arg[0]-1);
1887                 break;
1888         case 'h': /* SM -- Set terminal mode */
1889                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1890                 break;
1891         case 'm': /* SGR -- Terminal attribute (color) */
1892                 tsetattr(csiescseq.arg, csiescseq.narg);
1893                 break;
1894         case 'r': /* DECSTBM -- Set Scrolling Region */
1895                 if(csiescseq.priv) {
1896                         goto unknown;
1897                 } else {
1898                         DEFAULT(csiescseq.arg[0], 1);
1899                         DEFAULT(csiescseq.arg[1], term.row);
1900                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1901                         tmoveato(0, 0);
1902                 }
1903                 break;
1904         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1905                 tcursor(CURSOR_SAVE);
1906                 break;
1907         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1908                 tcursor(CURSOR_LOAD);
1909                 break;
1910         }
1911 }
1912
1913 void
1914 csidump(void) {
1915         int i;
1916         uint c;
1917
1918         printf("ESC[");
1919         for(i = 0; i < csiescseq.len; i++) {
1920                 c = csiescseq.buf[i] & 0xff;
1921                 if(isprint(c)) {
1922                         putchar(c);
1923                 } else if(c == '\n') {
1924                         printf("(\\n)");
1925                 } else if(c == '\r') {
1926                         printf("(\\r)");
1927                 } else if(c == 0x1b) {
1928                         printf("(\\e)");
1929                 } else {
1930                         printf("(%02x)", c);
1931                 }
1932         }
1933         putchar('\n');
1934 }
1935
1936 void
1937 csireset(void) {
1938         memset(&csiescseq, 0, sizeof(csiescseq));
1939 }
1940
1941 void
1942 strhandle(void) {
1943         char *p = NULL;
1944         int i, j, narg;
1945
1946         strparse();
1947         narg = strescseq.narg;
1948
1949         switch(strescseq.type) {
1950         case ']': /* OSC -- Operating System Command */
1951                 switch(i = atoi(strescseq.args[0])) {
1952                 case 0:
1953                 case 1:
1954                 case 2:
1955                         if(narg > 1)
1956                                 xsettitle(strescseq.args[1]);
1957                         break;
1958                 case 4: /* color set */
1959                         if(narg < 3)
1960                                 break;
1961                         p = strescseq.args[2];
1962                         /* fall through */
1963                 case 104: /* color reset, here p = NULL */
1964                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
1965                         if (!xsetcolorname(j, p)) {
1966                                 fprintf(stderr, "erresc: invalid color %s\n", p);
1967                         } else {
1968                                 /*
1969                                  * TODO if defaultbg color is changed, borders
1970                                  * are dirty
1971                                  */
1972                                 redraw(0);
1973                         }
1974                         break;
1975                 default:
1976                         fprintf(stderr, "erresc: unknown str ");
1977                         strdump();
1978                         break;
1979                 }
1980                 break;
1981         case 'k': /* old title set compatibility */
1982                 xsettitle(strescseq.args[0]);
1983                 break;
1984         case 'P': /* DSC -- Device Control String */
1985         case '_': /* APC -- Application Program Command */
1986         case '^': /* PM -- Privacy Message */
1987         default:
1988                 fprintf(stderr, "erresc: unknown str ");
1989                 strdump();
1990                 /* die(""); */
1991                 break;
1992         }
1993 }
1994
1995 void
1996 strparse(void) {
1997         char *p = strescseq.buf;
1998
1999         strescseq.narg = 0;
2000         strescseq.buf[strescseq.len] = '\0';
2001         while(p && strescseq.narg < STR_ARG_SIZ)
2002                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2003 }
2004
2005 void
2006 strdump(void) {
2007         int i;
2008         uint c;
2009
2010         printf("ESC%c", strescseq.type);
2011         for(i = 0; i < strescseq.len; i++) {
2012                 c = strescseq.buf[i] & 0xff;
2013                 if(c == '\0') {
2014                         return;
2015                 } else if(isprint(c)) {
2016                         putchar(c);
2017                 } else if(c == '\n') {
2018                         printf("(\\n)");
2019                 } else if(c == '\r') {
2020                         printf("(\\r)");
2021                 } else if(c == 0x1b) {
2022                         printf("(\\e)");
2023                 } else {
2024                         printf("(%02x)", c);
2025                 }
2026         }
2027         printf("ESC\\\n");
2028 }
2029
2030 void
2031 strreset(void) {
2032         memset(&strescseq, 0, sizeof(strescseq));
2033 }
2034
2035 void
2036 tputtab(bool forward) {
2037         uint x = term.c.x;
2038
2039         if(forward) {
2040                 if(x == term.col)
2041                         return;
2042                 for(++x; x < term.col && !term.tabs[x]; ++x)
2043                         /* nothing */ ;
2044         } else {
2045                 if(x == 0)
2046                         return;
2047                 for(--x; x > 0 && !term.tabs[x]; --x)
2048                         /* nothing */ ;
2049         }
2050         tmoveto(x, term.c.y);
2051 }
2052
2053 void
2054 techo(char *buf, int len) {
2055         for(; len > 0; buf++, len--) {
2056                 char c = *buf;
2057
2058                 if(c == '\033') {               /* escape */
2059                         tputc("^", 1);
2060                         tputc("[", 1);
2061                 } else if(c < '\x20') { /* control code */
2062                         if(c != '\n' && c != '\r' && c != '\t') {
2063                                 c |= '\x40';
2064                                 tputc("^", 1);
2065                         }
2066                         tputc(&c, 1);
2067                 } else {
2068                         break;
2069                 }
2070         }
2071         if(len)
2072                 tputc(buf, len);
2073 }
2074
2075 void
2076 tputc(char *c, int len) {
2077         uchar ascii = *c;
2078         bool control = ascii < '\x20' || ascii == 0177;
2079
2080         if(iofd != -1) {
2081                 if(xwrite(iofd, c, len) < 0) {
2082                         fprintf(stderr, "Error writing in %s:%s\n",
2083                                 opt_io, strerror(errno));
2084                         close(iofd);
2085                         iofd = -1;
2086                 }
2087         }
2088
2089         /*
2090          * STR sequences must be checked before anything else
2091          * because it can use some control codes as part of the sequence.
2092          */
2093         if(term.esc & ESC_STR) {
2094                 switch(ascii) {
2095                 case '\033':
2096                         term.esc = ESC_START | ESC_STR_END;
2097                         break;
2098                 case '\a': /* backwards compatibility to xterm */
2099                         term.esc = 0;
2100                         strhandle();
2101                         break;
2102                 default:
2103                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2104                                 memmove(&strescseq.buf[strescseq.len], c, len);
2105                                 strescseq.len += len;
2106                         } else {
2107                         /*
2108                          * Here is a bug in terminals. If the user never sends
2109                          * some code to stop the str or esc command, then st
2110                          * will stop responding. But this is better than
2111                          * silently failing with unknown characters. At least
2112                          * then users will report back.
2113                          *
2114                          * In the case users ever get fixed, here is the code:
2115                          */
2116                         /*
2117                          * term.esc = 0;
2118                          * strhandle();
2119                          */
2120                         }
2121                 }
2122                 return;
2123         }
2124
2125         /*
2126          * Actions of control codes must be performed as soon they arrive
2127          * because they can be embedded inside a control sequence, and
2128          * they must not cause conflicts with sequences.
2129          */
2130         if(control) {
2131                 switch(ascii) {
2132                 case '\t':      /* HT */
2133                         tputtab(1);
2134                         return;
2135                 case '\b':      /* BS */
2136                         tmoveto(term.c.x-1, term.c.y);
2137                         return;
2138                 case '\r':      /* CR */
2139                         tmoveto(0, term.c.y);
2140                         return;
2141                 case '\f':      /* LF */
2142                 case '\v':      /* VT */
2143                 case '\n':      /* LF */
2144                         /* go to first col if the mode is set */
2145                         tnewline(IS_SET(MODE_CRLF));
2146                         return;
2147                 case '\a':      /* BEL */
2148                         if(!(xw.state & WIN_FOCUSED))
2149                                 xseturgency(1);
2150                         return;
2151                 case '\033':    /* ESC */
2152                         csireset();
2153                         term.esc = ESC_START;
2154                         return;
2155                 case '\016':    /* SO */
2156                 case '\017':    /* SI */
2157                         /*
2158                          * Different charsets are hard to handle. Applications
2159                          * should use the right alt charset escapes for the
2160                          * only reason they still exist: line drawing. The
2161                          * rest is incompatible history st should not support.
2162                          */
2163                         return;
2164                 case '\032':    /* SUB */
2165                 case '\030':    /* CAN */
2166                         csireset();
2167                         return;
2168                 case '\005':    /* ENQ (IGNORED) */
2169                 case '\000':    /* NUL (IGNORED) */
2170                 case '\021':    /* XON (IGNORED) */
2171                 case '\023':    /* XOFF (IGNORED) */
2172                 case 0177:      /* DEL (IGNORED) */
2173                         return;
2174                 }
2175         } else if(term.esc & ESC_START) {
2176                 if(term.esc & ESC_CSI) {
2177                         csiescseq.buf[csiescseq.len++] = ascii;
2178                         if(BETWEEN(ascii, 0x40, 0x7E)
2179                                         || csiescseq.len >= \
2180                                         sizeof(csiescseq.buf)-1) {
2181                                 term.esc = 0;
2182                                 csiparse();
2183                                 csihandle();
2184                         }
2185                 } else if(term.esc & ESC_STR_END) {
2186                         term.esc = 0;
2187                         if(ascii == '\\')
2188                                 strhandle();
2189                 } else if(term.esc & ESC_ALTCHARSET) {
2190                         switch(ascii) {
2191                         case '0': /* Line drawing set */
2192                                 term.c.attr.mode |= ATTR_GFX;
2193                                 break;
2194                         case 'B': /* USASCII */
2195                                 term.c.attr.mode &= ~ATTR_GFX;
2196                                 break;
2197                         case 'A': /* UK (IGNORED) */
2198                         case '<': /* multinational charset (IGNORED) */
2199                         case '5': /* Finnish (IGNORED) */
2200                         case 'C': /* Finnish (IGNORED) */
2201                         case 'K': /* German (IGNORED) */
2202                                 break;
2203                         default:
2204                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2205                         }
2206                         term.esc = 0;
2207                 } else if(term.esc & ESC_TEST) {
2208                         if(ascii == '8') { /* DEC screen alignment test. */
2209                                 char E[UTF_SIZ] = "E";
2210                                 int x, y;
2211
2212                                 for(x = 0; x < term.col; ++x) {
2213                                         for(y = 0; y < term.row; ++y)
2214                                                 tsetchar(E, &term.c.attr, x, y);
2215                                 }
2216                         }
2217                         term.esc = 0;
2218                 } else {
2219                         switch(ascii) {
2220                         case '[':
2221                                 term.esc |= ESC_CSI;
2222                                 break;
2223                         case '#':
2224                                 term.esc |= ESC_TEST;
2225                                 break;
2226                         case 'P': /* DCS -- Device Control String */
2227                         case '_': /* APC -- Application Program Command */
2228                         case '^': /* PM -- Privacy Message */
2229                         case ']': /* OSC -- Operating System Command */
2230                         case 'k': /* old title set compatibility */
2231                                 strreset();
2232                                 strescseq.type = ascii;
2233                                 term.esc |= ESC_STR;
2234                                 break;
2235                         case '(': /* set primary charset G0 */
2236                                 term.esc |= ESC_ALTCHARSET;
2237                                 break;
2238                         case ')': /* set secondary charset G1 (IGNORED) */
2239                         case '*': /* set tertiary charset G2 (IGNORED) */
2240                         case '+': /* set quaternary charset G3 (IGNORED) */
2241                                 term.esc = 0;
2242                                 break;
2243                         case 'D': /* IND -- Linefeed */
2244                                 if(term.c.y == term.bot) {
2245                                         tscrollup(term.top, 1);
2246                                 } else {
2247                                         tmoveto(term.c.x, term.c.y+1);
2248                                 }
2249                                 term.esc = 0;
2250                                 break;
2251                         case 'E': /* NEL -- Next line */
2252                                 tnewline(1); /* always go to first col */
2253                                 term.esc = 0;
2254                                 break;
2255                         case 'H': /* HTS -- Horizontal tab stop */
2256                                 term.tabs[term.c.x] = 1;
2257                                 term.esc = 0;
2258                                 break;
2259                         case 'M': /* RI -- Reverse index */
2260                                 if(term.c.y == term.top) {
2261                                         tscrolldown(term.top, 1);
2262                                 } else {
2263                                         tmoveto(term.c.x, term.c.y-1);
2264                                 }
2265                                 term.esc = 0;
2266                                 break;
2267                         case 'Z': /* DECID -- Identify Terminal */
2268                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2269                                 term.esc = 0;
2270                                 break;
2271                         case 'c': /* RIS -- Reset to inital state */
2272                                 treset();
2273                                 term.esc = 0;
2274                                 xresettitle();
2275                                 break;
2276                         case '=': /* DECPAM -- Application keypad */
2277                                 term.mode |= MODE_APPKEYPAD;
2278                                 term.esc = 0;
2279                                 break;
2280                         case '>': /* DECPNM -- Normal keypad */
2281                                 term.mode &= ~MODE_APPKEYPAD;
2282                                 term.esc = 0;
2283                                 break;
2284                         case '7': /* DECSC -- Save Cursor */
2285                                 tcursor(CURSOR_SAVE);
2286                                 term.esc = 0;
2287                                 break;
2288                         case '8': /* DECRC -- Restore Cursor */
2289                                 tcursor(CURSOR_LOAD);
2290                                 term.esc = 0;
2291                                 break;
2292                         case '\\': /* ST -- Stop */
2293                                 term.esc = 0;
2294                                 break;
2295                         default:
2296                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2297                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2298                                 term.esc = 0;
2299                         }
2300                 }
2301                 /*
2302                  * All characters which form part of a sequence are not
2303                  * printed
2304                  */
2305                 return;
2306         }
2307         /*
2308          * Display control codes only if we are in graphic mode
2309          */
2310         if(control && !(term.c.attr.mode & ATTR_GFX))
2311                 return;
2312         if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
2313                 sel.bx = -1;
2314         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2315                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2316                 tnewline(1);
2317         }
2318
2319         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2320                 memmove(&term.line[term.c.y][term.c.x+1],
2321                         &term.line[term.c.y][term.c.x],
2322                         (term.col - term.c.x - 1) * sizeof(Glyph));
2323         }
2324
2325         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2326         if(term.c.x+1 < term.col) {
2327                 tmoveto(term.c.x+1, term.c.y);
2328         } else {
2329                 term.c.state |= CURSOR_WRAPNEXT;
2330         }
2331 }
2332
2333 int
2334 tresize(int col, int row) {
2335         int i;
2336         int minrow = MIN(row, term.row);
2337         int mincol = MIN(col, term.col);
2338         int slide = term.c.y - row + 1;
2339         bool *bp;
2340         Line *orig;
2341
2342         if(col < 1 || row < 1)
2343                 return 0;
2344
2345         /* free unneeded rows */
2346         i = 0;
2347         if(slide > 0) {
2348                 /*
2349                  * slide screen to keep cursor where we expect it -
2350                  * tscrollup would work here, but we can optimize to
2351                  * memmove because we're freeing the earlier lines
2352                  */
2353                 for(/* i = 0 */; i < slide; i++) {
2354                         free(term.line[i]);
2355                         free(term.alt[i]);
2356                 }
2357                 memmove(term.line, term.line + slide, row * sizeof(Line));
2358                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2359         }
2360         for(i += row; i < term.row; i++) {
2361                 free(term.line[i]);
2362                 free(term.alt[i]);
2363         }
2364
2365         /* resize to new height */
2366         term.line = xrealloc(term.line, row * sizeof(Line));
2367         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2368         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2369         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2370
2371         /* resize each row to new width, zero-pad if needed */
2372         for(i = 0; i < minrow; i++) {
2373                 term.dirty[i] = 1;
2374                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2375                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2376         }
2377
2378         /* allocate any new rows */
2379         for(/* i == minrow */; i < row; i++) {
2380                 term.dirty[i] = 1;
2381                 term.line[i] = xcalloc(col, sizeof(Glyph));
2382                 term.alt [i] = xcalloc(col, sizeof(Glyph));
2383         }
2384         if(col > term.col) {
2385                 bp = term.tabs + term.col;
2386
2387                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2388                 while(--bp > term.tabs && !*bp)
2389                         /* nothing */ ;
2390                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2391                         *bp = 1;
2392         }
2393         /* update terminal size */
2394         term.col = col;
2395         term.row = row;
2396         /* reset scrolling region */
2397         tsetscroll(0, row-1);
2398         /* make use of the LIMIT in tmoveto */
2399         tmoveto(term.c.x, term.c.y);
2400         /* Clearing both screens */
2401         orig = term.line;
2402         do {
2403                 if(mincol < col && 0 < minrow) {
2404                         tclearregion(mincol, 0, col - 1, minrow - 1);
2405                 }
2406                 if(0 < col && minrow < row) {
2407                         tclearregion(0, minrow, col - 1, row - 1);
2408                 }
2409                 tswapscreen();
2410         } while(orig != term.line);
2411
2412         return (slide > 0);
2413 }
2414
2415 void
2416 xresize(int col, int row) {
2417         xw.tw = MAX(1, col * xw.cw);
2418         xw.th = MAX(1, row * xw.ch);
2419
2420         XFreePixmap(xw.dpy, xw.buf);
2421         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2422                         DefaultDepth(xw.dpy, xw.scr));
2423         XftDrawChange(xw.draw, xw.buf);
2424         xclear(0, 0, xw.w, xw.h);
2425 }
2426
2427 static inline ushort
2428 sixd_to_16bit(int x) {
2429         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2430 }
2431
2432 void
2433 xloadcols(void) {
2434         int i, r, g, b;
2435         XRenderColor color = { .alpha = 0xffff };
2436
2437         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2438         for(i = 0; i < LEN(colorname); i++) {
2439                 if(!colorname[i])
2440                         continue;
2441                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2442                         die("Could not allocate color '%s'\n", colorname[i]);
2443                 }
2444         }
2445
2446         /* load colors [16-255] ; same colors as xterm */
2447         for(i = 16, r = 0; r < 6; r++) {
2448                 for(g = 0; g < 6; g++) {
2449                         for(b = 0; b < 6; b++) {
2450                                 color.red = sixd_to_16bit(r);
2451                                 color.green = sixd_to_16bit(g);
2452                                 color.blue = sixd_to_16bit(b);
2453                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2454                                         die("Could not allocate color %d\n", i);
2455                                 }
2456                                 i++;
2457                         }
2458                 }
2459         }
2460
2461         for(r = 0; r < 24; r++, i++) {
2462                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2463                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2464                                         &dc.col[i])) {
2465                         die("Could not allocate color %d\n", i);
2466                 }
2467         }
2468 }
2469
2470 int
2471 xsetcolorname(int x, const char *name) {
2472         XRenderColor color = { .alpha = 0xffff };
2473         Colour colour;
2474         if (x < 0 || x > LEN(colorname))
2475                 return -1;
2476         if(!name) {
2477                 if(16 <= x && x < 16 + 216) {
2478                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2479                         color.red = sixd_to_16bit(r);
2480                         color.green = sixd_to_16bit(g);
2481                         color.blue = sixd_to_16bit(b);
2482                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2483                                 return 0; /* something went wrong */
2484                         dc.col[x] = colour;
2485                         return 1;
2486                 } else if (16 + 216 <= x && x < 256) {
2487                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2488                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2489                                 return 0; /* something went wrong */
2490                         dc.col[x] = colour;
2491                         return 1;
2492                 } else {
2493                         name = colorname[x];
2494                 }
2495         }
2496         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2497                 return 0;
2498         dc.col[x] = colour;
2499         return 1;
2500 }
2501
2502 void
2503 xtermclear(int col1, int row1, int col2, int row2) {
2504         XftDrawRect(xw.draw,
2505                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2506                         borderpx + col1 * xw.cw,
2507                         borderpx + row1 * xw.ch,
2508                         (col2-col1+1) * xw.cw,
2509                         (row2-row1+1) * xw.ch);
2510 }
2511
2512 /*
2513  * Absolute coordinates.
2514  */
2515 void
2516 xclear(int x1, int y1, int x2, int y2) {
2517         XftDrawRect(xw.draw,
2518                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2519                         x1, y1, x2-x1, y2-y1);
2520 }
2521
2522 void
2523 xhints(void) {
2524         XClassHint class = {opt_class ? opt_class : termname, termname};
2525         XWMHints wm = {.flags = InputHint, .input = 1};
2526         XSizeHints *sizeh = NULL;
2527
2528         sizeh = XAllocSizeHints();
2529         if(xw.isfixed == False) {
2530                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2531                 sizeh->height = xw.h;
2532                 sizeh->width = xw.w;
2533                 sizeh->height_inc = xw.ch;
2534                 sizeh->width_inc = xw.cw;
2535                 sizeh->base_height = 2 * borderpx;
2536                 sizeh->base_width = 2 * borderpx;
2537         } else {
2538                 sizeh->flags = PMaxSize | PMinSize;
2539                 sizeh->min_width = sizeh->max_width = xw.fw;
2540                 sizeh->min_height = sizeh->max_height = xw.fh;
2541         }
2542
2543         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2544         XFree(sizeh);
2545 }
2546
2547 int
2548 xloadfont(Font *f, FcPattern *pattern) {
2549         FcPattern *match;
2550         FcResult result;
2551
2552         match = FcFontMatch(NULL, pattern, &result);
2553         if(!match)
2554                 return 1;
2555
2556         if(!(f->set = FcFontSort(0, match, FcTrue, 0, &result))) {
2557                 FcPatternDestroy(match);
2558                 return 1;
2559         }
2560
2561         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2562                 FcPatternDestroy(match);
2563                 return 1;
2564         }
2565
2566         f->pattern = FcPatternDuplicate(pattern);
2567
2568         f->ascent = f->match->ascent;
2569         f->descent = f->match->descent;
2570         f->lbearing = 0;
2571         f->rbearing = f->match->max_advance_width;
2572
2573         f->height = f->ascent + f->descent;
2574         f->width = f->lbearing + f->rbearing;
2575
2576         return 0;
2577 }
2578
2579 void
2580 xloadfonts(char *fontstr, int fontsize) {
2581         FcPattern *pattern;
2582         FcResult result;
2583         double fontval;
2584
2585         if(fontstr[0] == '-') {
2586                 pattern = XftXlfdParse(fontstr, False, False);
2587         } else {
2588                 pattern = FcNameParse((FcChar8 *)fontstr);
2589         }
2590
2591         if(!pattern)
2592                 die("st: can't open font %s\n", fontstr);
2593
2594         if(fontsize > 0) {
2595                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2596                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2597                 usedfontsize = fontsize;
2598         } else {
2599                 result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2600                 if(result == FcResultMatch) {
2601                         usedfontsize = (int)fontval;
2602                 } else {
2603                         /*
2604                          * Default font size is 12, if none given. This is to
2605                          * have a known usedfontsize value.
2606                          */
2607                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2608                         usedfontsize = 12;
2609                 }
2610         }
2611
2612         FcConfigSubstitute(0, pattern, FcMatchPattern);
2613         FcDefaultSubstitute(pattern);
2614
2615         if(xloadfont(&dc.font, pattern))
2616                 die("st: can't open font %s\n", fontstr);
2617
2618         /* Setting character width and height. */
2619         xw.cw = dc.font.width;
2620         xw.ch = dc.font.height;
2621
2622         FcPatternDel(pattern, FC_SLANT);
2623         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2624         if(xloadfont(&dc.ifont, pattern))
2625                 die("st: can't open font %s\n", fontstr);
2626
2627         FcPatternDel(pattern, FC_WEIGHT);
2628         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2629         if(xloadfont(&dc.ibfont, pattern))
2630                 die("st: can't open font %s\n", fontstr);
2631
2632         FcPatternDel(pattern, FC_SLANT);
2633         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2634         if(xloadfont(&dc.bfont, pattern))
2635                 die("st: can't open font %s\n", fontstr);
2636
2637         FcPatternDestroy(pattern);
2638 }
2639
2640 void
2641 xunloadfonts(void) {
2642         int i, ip;
2643
2644         /*
2645          * Free the loaded fonts in the font cache. This is done backwards
2646          * from the frccur.
2647          */
2648         for(i = 0, ip = frccur; i < frclen; i++, ip--) {
2649                 if(ip < 0)
2650                         ip = LEN(frc) - 1;
2651                 XftFontClose(xw.dpy, frc[ip].font);
2652         }
2653         frccur = -1;
2654         frclen = 0;
2655
2656         XftFontClose(xw.dpy, dc.font.match);
2657         FcPatternDestroy(dc.font.pattern);
2658         FcFontSetDestroy(dc.font.set);
2659         XftFontClose(xw.dpy, dc.bfont.match);
2660         FcPatternDestroy(dc.bfont.pattern);
2661         FcFontSetDestroy(dc.bfont.set);
2662         XftFontClose(xw.dpy, dc.ifont.match);
2663         FcPatternDestroy(dc.ifont.pattern);
2664         FcFontSetDestroy(dc.ifont.set);
2665         XftFontClose(xw.dpy, dc.ibfont.match);
2666         FcPatternDestroy(dc.ibfont.pattern);
2667         FcFontSetDestroy(dc.ibfont.set);
2668 }
2669
2670 void
2671 xzoom(const Arg *arg) {
2672         xunloadfonts();
2673         xloadfonts(usedfont, usedfontsize + arg->i);
2674         cresize(0, 0);
2675         redraw(0);
2676 }
2677
2678 void
2679 xinit(void) {
2680         XSetWindowAttributes attrs;
2681         XGCValues gcvalues;
2682         Cursor cursor;
2683         Window parent;
2684         int sw, sh;
2685
2686         if(!(xw.dpy = XOpenDisplay(NULL)))
2687                 die("Can't open display\n");
2688         xw.scr = XDefaultScreen(xw.dpy);
2689         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2690
2691         /* font */
2692         if(!FcInit())
2693                 die("Could not init fontconfig.\n");
2694
2695         usedfont = (opt_font == NULL)? font : opt_font;
2696         xloadfonts(usedfont, 0);
2697
2698         /* colors */
2699         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2700         xloadcols();
2701
2702         /* adjust fixed window geometry */
2703         if(xw.isfixed) {
2704                 sw = DisplayWidth(xw.dpy, xw.scr);
2705                 sh = DisplayHeight(xw.dpy, xw.scr);
2706                 if(xw.fx < 0)
2707                         xw.fx = sw + xw.fx - xw.fw - 1;
2708                 if(xw.fy < 0)
2709                         xw.fy = sh + xw.fy - xw.fh - 1;
2710
2711                 xw.h = xw.fh;
2712                 xw.w = xw.fw;
2713         } else {
2714                 /* window - default size */
2715                 xw.h = 2 * borderpx + term.row * xw.ch;
2716                 xw.w = 2 * borderpx + term.col * xw.cw;
2717                 xw.fx = 0;
2718                 xw.fy = 0;
2719         }
2720
2721         /* Events */
2722         attrs.background_pixel = dc.col[defaultbg].pixel;
2723         attrs.border_pixel = dc.col[defaultbg].pixel;
2724         attrs.bit_gravity = NorthWestGravity;
2725         attrs.event_mask = FocusChangeMask | KeyPressMask
2726                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2727                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2728         attrs.colormap = xw.cmap;
2729
2730         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
2731                         XRootWindow(xw.dpy, xw.scr);
2732         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2733                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2734                         xw.vis,
2735                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2736                         | CWColormap,
2737                         &attrs);
2738
2739         memset(&gcvalues, 0, sizeof(gcvalues));
2740         gcvalues.graphics_exposures = False;
2741         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
2742                         &gcvalues);
2743         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2744                         DefaultDepth(xw.dpy, xw.scr));
2745         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
2746         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
2747
2748         /* Xft rendering context */
2749         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2750
2751         /* input methods */
2752         if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2753                 XSetLocaleModifiers("@im=local");
2754                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2755                         XSetLocaleModifiers("@im=");
2756                         if((xw.xim = XOpenIM(xw.dpy,
2757                                         NULL, NULL, NULL)) == NULL) {
2758                                 die("XOpenIM failed. Could not open input"
2759                                         " device.\n");
2760                         }
2761                 }
2762         }
2763         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2764                                            | XIMStatusNothing, XNClientWindow, xw.win,
2765                                            XNFocusWindow, xw.win, NULL);
2766         if(xw.xic == NULL)
2767                 die("XCreateIC failed. Could not obtain input method.\n");
2768
2769         /* white cursor, black outline */
2770         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2771         XDefineCursor(xw.dpy, xw.win, cursor);
2772         XRecolorCursor(xw.dpy, cursor,
2773                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2774                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2775
2776         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2777         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2778         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2779
2780         xresettitle();
2781         XMapWindow(xw.dpy, xw.win);
2782         xhints();
2783         XSync(xw.dpy, 0);
2784 }
2785
2786 void
2787 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2788         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
2789             width = charlen * xw.cw, xp, i;
2790         int frp, frcflags;
2791         int u8fl, u8fblen, u8cblen, doesexist;
2792         char *u8c, *u8fs;
2793         long u8char;
2794         Font *font = &dc.font;
2795         FcResult fcres;
2796         FcPattern *fcpattern, *fontpattern;
2797         FcFontSet *fcsets[] = { NULL };
2798         FcCharSet *fccharset;
2799         Colour *fg, *bg, *temp, revfg, revbg;
2800         XRenderColor colfg, colbg;
2801         Rectangle r;
2802
2803         frcflags = FRC_NORMAL;
2804
2805         if(base.mode & ATTR_ITALIC) {
2806                 if(base.fg == defaultfg)
2807                         base.fg = defaultitalic;
2808                 font = &dc.ifont;
2809                 frcflags = FRC_ITALIC;
2810         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
2811                 if(base.fg == defaultfg)
2812                         base.fg = defaultitalic;
2813                 font = &dc.ibfont;
2814                 frcflags = FRC_ITALICBOLD;
2815         } else if(base.mode & ATTR_UNDERLINE) {
2816                 if(base.fg == defaultfg)
2817                         base.fg = defaultunderline;
2818         }
2819         fg = &dc.col[base.fg];
2820         bg = &dc.col[base.bg];
2821
2822         if(base.mode & ATTR_BOLD) {
2823                 if(BETWEEN(base.fg, 0, 7)) {
2824                         /* basic system colors */
2825                         fg = &dc.col[base.fg + 8];
2826                 } else if(BETWEEN(base.fg, 16, 195)) {
2827                         /* 256 colors */
2828                         fg = &dc.col[base.fg + 36];
2829                 } else if(BETWEEN(base.fg, 232, 251)) {
2830                         /* greyscale */
2831                         fg = &dc.col[base.fg + 4];
2832                 }
2833                 /*
2834                  * Those ranges will not be brightened:
2835                  *      8 - 15 – bright system colors
2836                  *      196 - 231 – highest 256 color cube
2837                  *      252 - 255 – brightest colors in greyscale
2838                  */
2839                 font = &dc.bfont;
2840                 frcflags = FRC_BOLD;
2841         }
2842
2843         if(IS_SET(MODE_REVERSE)) {
2844                 if(fg == &dc.col[defaultfg]) {
2845                         fg = &dc.col[defaultbg];
2846                 } else {
2847                         colfg.red = ~fg->color.red;
2848                         colfg.green = ~fg->color.green;
2849                         colfg.blue = ~fg->color.blue;
2850                         colfg.alpha = fg->color.alpha;
2851                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
2852                         fg = &revfg;
2853                 }
2854
2855                 if(bg == &dc.col[defaultbg]) {
2856                         bg = &dc.col[defaultfg];
2857                 } else {
2858                         colbg.red = ~bg->color.red;
2859                         colbg.green = ~bg->color.green;
2860                         colbg.blue = ~bg->color.blue;
2861                         colbg.alpha = bg->color.alpha;
2862                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
2863                         bg = &revbg;
2864                 }
2865         }
2866
2867         if(base.mode & ATTR_REVERSE) {
2868                 temp = fg;
2869                 fg = bg;
2870                 bg = temp;
2871         }
2872
2873         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
2874                 fg = bg;
2875
2876         /* Intelligent cleaning up of the borders. */
2877         if(x == 0) {
2878                 xclear(0, (y == 0)? 0 : winy, borderpx,
2879                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
2880         }
2881         if(x + charlen >= term.col) {
2882                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
2883                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
2884         }
2885         if(y == 0)
2886                 xclear(winx, 0, winx + width, borderpx);
2887         if(y == term.row-1)
2888                 xclear(winx, winy + xw.ch, winx + width, xw.h);
2889
2890         /* Clean up the region we want to draw to. */
2891         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
2892
2893         /* Set the clip region because Xft is sometimes dirty. */
2894         r.x = 0;
2895         r.y = 0;
2896         r.height = xw.ch;
2897         r.width = width;
2898         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
2899
2900         fcsets[0] = font->set;
2901         for(xp = winx; bytelen > 0;) {
2902                 /*
2903                  * Search for the range in the to be printed string of glyphs
2904                  * that are in the main font. Then print that range. If
2905                  * some glyph is found that is not in the font, do the
2906                  * fallback dance.
2907                  */
2908                 u8fs = s;
2909                 u8fblen = 0;
2910                 u8fl = 0;
2911                 for(;;) {
2912                         u8c = s;
2913                         u8cblen = utf8decode(s, &u8char);
2914                         s += u8cblen;
2915                         bytelen -= u8cblen;
2916
2917                         doesexist = XftCharIndex(xw.dpy, font->match, u8char);
2918                         if(!doesexist || bytelen <= 0) {
2919                                 if(bytelen <= 0) {
2920                                         if(doesexist) {
2921                                                 u8fl++;
2922                                                 u8fblen += u8cblen;
2923                                         }
2924                                 }
2925
2926                                 if(u8fl > 0) {
2927                                         XftDrawStringUtf8(xw.draw, fg,
2928                                                         font->match, xp,
2929                                                         winy + font->ascent,
2930                                                         (FcChar8 *)u8fs,
2931                                                         u8fblen);
2932                                         xp += font->width * u8fl;
2933
2934                                 }
2935                                 break;
2936                         }
2937
2938                         u8fl++;
2939                         u8fblen += u8cblen;
2940                 }
2941                 if(doesexist)
2942                         break;
2943
2944                 frp = frccur;
2945                 /* Search the font cache. */
2946                 for(i = 0; i < frclen; i++, frp--) {
2947                         if(frp <= 0)
2948                                 frp = LEN(frc) - 1;
2949
2950                         if(frc[frp].c == u8char
2951                                         && frc[frp].flags == frcflags) {
2952                                 break;
2953                         }
2954                 }
2955
2956                 /* Nothing was found. */
2957                 if(i >= frclen) {
2958                         /*
2959                          * Nothing was found in the cache. Now use
2960                          * some dozen of Fontconfig calls to get the
2961                          * font for one single character.
2962                          */
2963                         fcpattern = FcPatternDuplicate(font->pattern);
2964                         fccharset = FcCharSetCreate();
2965
2966                         FcCharSetAddChar(fccharset, u8char);
2967                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
2968                                         fccharset);
2969                         FcPatternAddBool(fcpattern, FC_SCALABLE,
2970                                         FcTrue);
2971
2972                         FcConfigSubstitute(0, fcpattern,
2973                                         FcMatchPattern);
2974                         FcDefaultSubstitute(fcpattern);
2975
2976                         fontpattern = FcFontSetMatch(0, fcsets,
2977                                         FcTrue, fcpattern, &fcres);
2978
2979                         /*
2980                          * Overwrite or create the new cache entry.
2981                          */
2982                         frccur++;
2983                         frclen++;
2984                         if(frccur >= LEN(frc))
2985                                 frccur = 0;
2986                         if(frclen > LEN(frc)) {
2987                                 frclen = LEN(frc);
2988                                 XftFontClose(xw.dpy, frc[frccur].font);
2989                         }
2990
2991                         frc[frccur].font = XftFontOpenPattern(xw.dpy,
2992                                         fontpattern);
2993                         frc[frccur].c = u8char;
2994                         frc[frccur].flags = frcflags;
2995
2996                         FcPatternDestroy(fcpattern);
2997                         FcCharSetDestroy(fccharset);
2998
2999                         frp = frccur;
3000                 }
3001
3002                 XftDrawStringUtf8(xw.draw, fg, frc[frp].font,
3003                                 xp, winy + frc[frp].font->ascent,
3004                                 (FcChar8 *)u8c, u8cblen);
3005
3006                 xp += font->width;
3007         }
3008
3009         /*
3010         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3011                         winy + font->ascent, (FcChar8 *)s, bytelen);
3012         */
3013
3014         if(base.mode & ATTR_UNDERLINE) {
3015                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3016                                 width, 1);
3017         }
3018
3019         /* Reset clip to none. */
3020         XftDrawSetClip(xw.draw, 0);
3021 }
3022
3023 void
3024 xdrawcursor(void) {
3025         static int oldx = 0, oldy = 0;
3026         int sl;
3027         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3028
3029         LIMIT(oldx, 0, term.col-1);
3030         LIMIT(oldy, 0, term.row-1);
3031
3032         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3033
3034         /* remove the old cursor */
3035         sl = utf8size(term.line[oldy][oldx].c);
3036         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3037                         oldy, 1, sl);
3038
3039         /* draw the new one */
3040         if(!(IS_SET(MODE_HIDE))) {
3041                 if(xw.state & WIN_FOCUSED) {
3042                         if(IS_SET(MODE_REVERSE)) {
3043                                 g.mode |= ATTR_REVERSE;
3044                                 g.fg = defaultcs;
3045                                 g.bg = defaultfg;
3046                         }
3047
3048                         sl = utf8size(g.c);
3049                         xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
3050                 } else {
3051                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3052                                         borderpx + term.c.x * xw.cw,
3053                                         borderpx + term.c.y * xw.ch,
3054                                         xw.cw - 1, 1);
3055                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3056                                         borderpx + term.c.x * xw.cw,
3057                                         borderpx + term.c.y * xw.ch,
3058                                         1, xw.ch - 1);
3059                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3060                                         borderpx + (term.c.x + 1) * xw.cw - 1,
3061                                         borderpx + term.c.y * xw.ch,
3062                                         1, xw.ch - 1);
3063                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3064                                         borderpx + term.c.x * xw.cw,
3065                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3066                                         xw.cw, 1);
3067                 }
3068                 oldx = term.c.x, oldy = term.c.y;
3069         }
3070 }
3071
3072
3073 void
3074 xsettitle(char *p) {
3075         XTextProperty prop;
3076
3077         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3078                         &prop);
3079         XSetWMName(xw.dpy, xw.win, &prop);
3080 }
3081
3082 void
3083 xresettitle(void) {
3084         xsettitle(opt_title ? opt_title : "st");
3085 }
3086
3087 void
3088 redraw(int timeout) {
3089         struct timespec tv = {0, timeout * 1000};
3090
3091         tfulldirt();
3092         draw();
3093
3094         if(timeout > 0) {
3095                 nanosleep(&tv, NULL);
3096                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3097         }
3098 }
3099
3100 void
3101 draw(void) {
3102         drawregion(0, 0, term.col, term.row);
3103         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3104                         xw.h, 0, 0);
3105         XSetForeground(xw.dpy, dc.gc,
3106                         dc.col[IS_SET(MODE_REVERSE)?
3107                                 defaultfg : defaultbg].pixel);
3108 }
3109
3110 void
3111 drawregion(int x1, int y1, int x2, int y2) {
3112         int ic, ib, x, y, ox, sl;
3113         Glyph base, new;
3114         char buf[DRAW_BUF_SIZ];
3115         bool ena_sel = sel.bx != -1;
3116
3117         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3118                 ena_sel = 0;
3119
3120         if(!(xw.state & WIN_VISIBLE))
3121                 return;
3122
3123         for(y = y1; y < y2; y++) {
3124                 if(!term.dirty[y])
3125                         continue;
3126
3127                 xtermclear(0, y, term.col, y);
3128                 term.dirty[y] = 0;
3129                 base = term.line[y][0];
3130                 ic = ib = ox = 0;
3131                 for(x = x1; x < x2; x++) {
3132                         new = term.line[y][x];
3133                         if(ena_sel && selected(x, y))
3134                                 new.mode ^= ATTR_REVERSE;
3135                         if(ib > 0 && (ATTRCMP(base, new)
3136                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3137                                 xdraws(buf, base, ox, y, ic, ib);
3138                                 ic = ib = 0;
3139                         }
3140                         if(ib == 0) {
3141                                 ox = x;
3142                                 base = new;
3143                         }
3144
3145                         sl = utf8size(new.c);
3146                         memcpy(buf+ib, new.c, sl);
3147                         ib += sl;
3148                         ++ic;
3149                 }
3150                 if(ib > 0)
3151                         xdraws(buf, base, ox, y, ic, ib);
3152         }
3153         xdrawcursor();
3154 }
3155
3156 void
3157 expose(XEvent *ev) {
3158         XExposeEvent *e = &ev->xexpose;
3159
3160         if(xw.state & WIN_REDRAW) {
3161                 if(!e->count)
3162                         xw.state &= ~WIN_REDRAW;
3163         }
3164         redraw(0);
3165 }
3166
3167 void
3168 visibility(XEvent *ev) {
3169         XVisibilityEvent *e = &ev->xvisibility;
3170
3171         if(e->state == VisibilityFullyObscured) {
3172                 xw.state &= ~WIN_VISIBLE;
3173         } else if(!(xw.state & WIN_VISIBLE)) {
3174                 /* need a full redraw for next Expose, not just a buf copy */
3175                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3176         }
3177 }
3178
3179 void
3180 unmap(XEvent *ev) {
3181         xw.state &= ~WIN_VISIBLE;
3182 }
3183
3184 void
3185 xseturgency(int add) {
3186         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3187
3188         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3189         XSetWMHints(xw.dpy, xw.win, h);
3190         XFree(h);
3191 }
3192
3193 void
3194 focus(XEvent *ev) {
3195         XFocusChangeEvent *e = &ev->xfocus;
3196
3197         if(e->mode == NotifyGrab)
3198                 return;
3199
3200         if(ev->type == FocusIn) {
3201                 XSetICFocus(xw.xic);
3202                 xw.state |= WIN_FOCUSED;
3203                 xseturgency(0);
3204         } else {
3205                 XUnsetICFocus(xw.xic);
3206                 xw.state &= ~WIN_FOCUSED;
3207         }
3208 }
3209
3210 inline bool
3211 match(uint mask, uint state) {
3212         state &= ~(ignoremod);
3213
3214         if(mask == XK_NO_MOD && state)
3215                 return false;
3216         if(mask != XK_ANY_MOD && mask != XK_NO_MOD && !state)
3217                 return false;
3218         if((state & mask) != state)
3219                 return false;
3220         return true;
3221 }
3222
3223 void
3224 numlock(const Arg *dummy) {
3225         term.numlock ^= 1;
3226 }
3227
3228 char*
3229 kmap(KeySym k, uint state) {
3230         uint mask;
3231         Key *kp;
3232         int i;
3233
3234         /* Check for mapped keys out of X11 function keys. */
3235         for(i = 0; i < LEN(mappedkeys); i++) {
3236                 if(mappedkeys[i] == k)
3237                         break;
3238         }
3239         if(i == LEN(mappedkeys)) {
3240                 if((k & 0xFFFF) < 0xFD00)
3241                         return NULL;
3242         }
3243
3244         for(kp = key; kp < key + LEN(key); kp++) {
3245                 mask = kp->mask;
3246
3247                 if(kp->k != k)
3248                         continue;
3249
3250                 if(!match(mask, state))
3251                         continue;
3252
3253                 if(kp->appkey > 0) {
3254                         if(!IS_SET(MODE_APPKEYPAD))
3255                                 continue;
3256                         if(term.numlock && kp->appkey == 2)
3257                                 continue;
3258                 } else if(kp->appkey < 0 && IS_SET(MODE_APPKEYPAD)) {
3259                         continue;
3260                 }
3261
3262                 if((kp->appcursor < 0 && IS_SET(MODE_APPCURSOR)) ||
3263                                 (kp->appcursor > 0
3264                                  && !IS_SET(MODE_APPCURSOR))) {
3265                         continue;
3266                 }
3267
3268                 if((kp->crlf < 0 && IS_SET(MODE_CRLF)) ||
3269                                 (kp->crlf > 0 && !IS_SET(MODE_CRLF))) {
3270                         continue;
3271                 }
3272
3273                 return kp->s;
3274         }
3275
3276         return NULL;
3277 }
3278
3279 void
3280 kpress(XEvent *ev) {
3281         XKeyEvent *e = &ev->xkey;
3282         KeySym ksym;
3283         char xstr[31], buf[32], *customkey, *cp = buf;
3284         int len, ret;
3285         long c;
3286         Status status;
3287         Shortcut *bp;
3288
3289         if(IS_SET(MODE_KBDLOCK))
3290                 return;
3291
3292         len = XmbLookupString(xw.xic, e, xstr, sizeof(xstr), &ksym, &status);
3293         e->state &= ~Mod2Mask;
3294         /* 1. shortcuts */
3295         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3296                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3297                         bp->func(&(bp->arg));
3298                         return;
3299                 }
3300         }
3301
3302         /* 2. custom keys from config.h */
3303         if((customkey = kmap(ksym, e->state))) {
3304                 len = strlen(customkey);
3305                 memcpy(buf, customkey, len);
3306         /* 3. hardcoded (overrides X lookup) */
3307         } else {
3308                 if(len == 0)
3309                         return;
3310
3311                 if(len == 1 && e->state & Mod1Mask) {
3312                         if(IS_SET(MODE_8BIT)) {
3313                                 if(*xstr < 0177) {
3314                                         c = *xstr | B7;
3315                                         ret = utf8encode(&c, cp);
3316                                         cp += ret;
3317                                         len = 0;
3318                                 }
3319                         } else {
3320                                 *cp++ = '\033';
3321                         }
3322                 }
3323
3324                 memcpy(cp, xstr, len);
3325                 len = cp - buf + len;
3326         }
3327
3328         ttywrite(buf, len);
3329         if(IS_SET(MODE_ECHO))
3330                 techo(buf, len);
3331 }
3332
3333
3334 void
3335 cmessage(XEvent *e) {
3336         /*
3337          * See xembed specs
3338          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3339          */
3340         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3341                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3342                         xw.state |= WIN_FOCUSED;
3343                         xseturgency(0);
3344                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3345                         xw.state &= ~WIN_FOCUSED;
3346                 }
3347         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3348                 /* Send SIGHUP to shell */
3349                 kill(pid, SIGHUP);
3350                 exit(EXIT_SUCCESS);
3351         }
3352 }
3353
3354 void
3355 cresize(int width, int height) {
3356         int col, row;
3357
3358         if(width != 0)
3359                 xw.w = width;
3360         if(height != 0)
3361                 xw.h = height;
3362
3363         col = (xw.w - 2 * borderpx) / xw.cw;
3364         row = (xw.h - 2 * borderpx) / xw.ch;
3365
3366         tresize(col, row);
3367         xresize(col, row);
3368         ttyresize();
3369 }
3370
3371 void
3372 resize(XEvent *e) {
3373         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3374                 return;
3375
3376         cresize(e->xconfigure.width, e->xconfigure.height);
3377 }
3378
3379 void
3380 run(void) {
3381         XEvent ev;
3382         fd_set rfd;
3383         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3384         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3385
3386         gettimeofday(&lastblink, NULL);
3387         gettimeofday(&last, NULL);
3388
3389         for(xev = actionfps;;) {
3390                 FD_ZERO(&rfd);
3391                 FD_SET(cmdfd, &rfd);
3392                 FD_SET(xfd, &rfd);
3393
3394                 switch(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3395                 case -1:
3396                         if(errno == EINTR)
3397                                 continue;
3398                         die("select failed: %s\n", SERRNO);
3399                 default:
3400                         if(FD_ISSET(cmdfd, &rfd)) {
3401                                 ttyread();
3402                                 if(blinktimeout) {
3403                                         blinkset = tattrset(ATTR_BLINK);
3404                                         if(!blinkset && term.mode & ATTR_BLINK)
3405                                                 term.mode &= ~(MODE_BLINK);
3406                                 }
3407                         }
3408
3409                         if(FD_ISSET(xfd, &rfd))
3410                                 xev = actionfps;
3411                         break;
3412                 }
3413                 gettimeofday(&now, NULL);
3414                 drawtimeout.tv_sec = 0;
3415                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3416                 tv = &drawtimeout;
3417
3418                 dodraw = 0;
3419                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3420                         tsetdirtattr(ATTR_BLINK);
3421                         term.mode ^= MODE_BLINK;
3422                         gettimeofday(&lastblink, NULL);
3423                         dodraw = 1;
3424                 }
3425                 if(TIMEDIFF(now, last) \
3426                                 > (xev? (1000/xfps) : (1000/actionfps))) {
3427                         dodraw = 1;
3428                         last = now;
3429                 }
3430
3431                 if(dodraw) {
3432                         while(XPending(xw.dpy)) {
3433                                 XNextEvent(xw.dpy, &ev);
3434                                 if(XFilterEvent(&ev, None))
3435                                         continue;
3436                                 if(handler[ev.type])
3437                                         (handler[ev.type])(&ev);
3438                         }
3439
3440                         draw();
3441                         XFlush(xw.dpy);
3442
3443                         if(xev && !FD_ISSET(xfd, &rfd))
3444                                 xev--;
3445                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd) \
3446                                         && !blinkset) {
3447                                 tv = NULL;
3448                         }
3449                 }
3450         }
3451 }
3452
3453 void
3454 usage(void) {
3455         die("%s " VERSION " (c) 2010-2013 st engineers\n" \
3456         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3457         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3458 }
3459
3460 int
3461 main(int argc, char *argv[]) {
3462         int bitm, xr, yr;
3463         uint wr, hr;
3464
3465         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3466         xw.isfixed = False;
3467
3468         ARGBEGIN {
3469         case 'a':
3470                 allowaltscreen = false;
3471                 break;
3472         case 'c':
3473                 opt_class = EARGF(usage());
3474                 break;
3475         case 'e':
3476                 /* eat all remaining arguments */
3477                 if(argc > 1)
3478                         opt_cmd = &argv[1];
3479                 goto run;
3480         case 'f':
3481                 opt_font = EARGF(usage());
3482                 break;
3483         case 'g':
3484                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3485                 if(bitm & XValue)
3486                         xw.fx = xr;
3487                 if(bitm & YValue)
3488                         xw.fy = yr;
3489                 if(bitm & WidthValue)
3490                         xw.fw = (int)wr;
3491                 if(bitm & HeightValue)
3492                         xw.fh = (int)hr;
3493                 if(bitm & XNegative && xw.fx == 0)
3494                         xw.fx = -1;
3495                 if(bitm & XNegative && xw.fy == 0)
3496                         xw.fy = -1;
3497
3498                 if(xw.fh != 0 && xw.fw != 0)
3499                         xw.isfixed = True;
3500                 break;
3501         case 'o':
3502                 opt_io = EARGF(usage());
3503                 break;
3504         case 't':
3505                 opt_title = EARGF(usage());
3506                 break;
3507         case 'w':
3508                 opt_embed = EARGF(usage());
3509                 break;
3510         case 'v':
3511         default:
3512                 usage();
3513         } ARGEND;
3514
3515 run:
3516         setlocale(LC_CTYPE, "");
3517         XSetLocaleModifiers("");
3518         tnew(80, 24);
3519         xinit();
3520         ttynew();
3521         selinit();
3522         if(xw.isfixed)
3523                 cresize(xw.h, xw.w);
3524         run();
3525
3526         return 0;
3527 }
3528