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