st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/Xft/Xft.h>
  28 #include <fontconfig/fontconfig.h>
  29
  30 #include "arg.h"
  31
  32 char *argv0;
  33
  34 #define Glyph Glyph_
  35 #define Font Font_
  36 #define Draw XftDraw *
  37 #define Colour XftColor
  38 #define Colourmap Colormap
  39 #define Rectangle XRectangle
  40
  41 #if   defined(__linux)
  42  #include <pty.h>
  43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  44  #include <util.h>
  45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  46  #include <libutil.h>
  47 #endif
  48
  49
  50 /* XEMBED messages */
  51 #define XEMBED_FOCUS_IN  4
  52 #define XEMBED_FOCUS_OUT 5
  53
  54 /* Arbitrary sizes */
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define SERRNO strerror(errno)
  69 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  70 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  71 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  72 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  73 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  74 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  75 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  76 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  77 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  78
  79 #define VT102ID "\033[?6c"
  80
  81 enum glyph_attribute {
  82         ATTR_NULL      = 0,
  83         ATTR_REVERSE   = 1,
  84         ATTR_UNDERLINE = 2,
  85         ATTR_BOLD      = 4,
  86         ATTR_GFX       = 8,
  87         ATTR_ITALIC    = 16,
  88         ATTR_BLINK     = 32,
  89         ATTR_WRAP      = 64,
  90 };
  91
  92 enum cursor_movement {
  93         CURSOR_SAVE,
  94         CURSOR_LOAD
  95 };
  96
  97 enum cursor_state {
  98         CURSOR_DEFAULT  = 0,
  99         CURSOR_WRAPNEXT = 1,
 100         CURSOR_ORIGIN   = 2
 101 };
 102
 103 enum term_mode {
 104         MODE_WRAP        = 1,
 105         MODE_INSERT      = 2,
 106         MODE_APPKEYPAD   = 4,
 107         MODE_ALTSCREEN   = 8,
 108         MODE_CRLF        = 16,
 109         MODE_MOUSEBTN    = 32,
 110         MODE_MOUSEMOTION = 64,
 111         MODE_MOUSE       = 32|64,
 112         MODE_REVERSE     = 128,
 113         MODE_KBDLOCK     = 256,
 114         MODE_HIDE        = 512,
 115         MODE_ECHO        = 1024,
 116         MODE_APPCURSOR   = 2048,
 117         MODE_MOUSESGR    = 4096,
 118         MODE_8BIT        = 8192,
 119         MODE_BLINK       = 16384,
 120         MODE_FBLINK      = 32768,
 121         MODE_FOCUS       = 65536,
 122 };
 123
 124 enum escape_state {
 125         ESC_START      = 1,
 126         ESC_CSI = 2,
 127         ESC_STR = 4, /* DSC, OSC, PM, APC */
 128         ESC_ALTCHARSET = 8,
 129         ESC_STR_END    = 16, /* a final string was encountered */
 130         ESC_TEST       = 32, /* Enter in test mode */
 131 };
 132
 133 enum window_state {
 134         WIN_VISIBLE = 1,
 135         WIN_REDRAW  = 2,
 136         WIN_FOCUSED = 4
 137 };
 138
 139 enum selection_type {
 140         SEL_REGULAR = 1,
 141         SEL_RECTANGULAR = 2
 142 };
 143
 144 enum selection_snap {
 145         SNAP_WORD = 1,
 146         SNAP_LINE = 2
 147 };
 148
 149 /* bit macro */
 150 #undef B0
 151 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 152
 153 typedef unsigned char uchar;
 154 typedef unsigned int uint;
 155 typedef unsigned long ulong;
 156 typedef unsigned short ushort;
 157
 158 typedef struct {
 159         char c[UTF_SIZ];     /* character code */
 160         uchar mode;  /* attribute flags */
 161         ushort fg;   /* foreground  */
 162         ushort bg;   /* background  */
 163 } Glyph;
 164
 165 typedef Glyph *Line;
 166
 167 typedef struct {
 168         Glyph attr;      /* current char attributes */
 169         int x;
 170         int y;
 171         char state;
 172 } TCursor;
 173
 174 /* CSI Escape sequence structs */
 175 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 176 typedef struct {
 177         char buf[ESC_BUF_SIZ]; /* raw string */
 178         int len;               /* raw string length */
 179         char priv;
 180         int arg[ESC_ARG_SIZ];
 181         int narg;              /* nb of args */
 182         char mode;
 183 } CSIEscape;
 184
 185 /* STR Escape sequence structs */
 186 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 187 typedef struct {
 188         char type;           /* ESC type ... */
 189         char buf[STR_BUF_SIZ]; /* raw string */
 190         int len;               /* raw string length */
 191         char *args[STR_ARG_SIZ];
 192         int narg;             /* nb of args */
 193 } STREscape;
 194
 195 /* Internal representation of the screen */
 196 typedef struct {
 197         int row;        /* nb row */
 198         int col;        /* nb col */
 199         Line *line;     /* screen */
 200         Line *alt;      /* alternate screen */
 201         bool *dirty;    /* dirtyness of lines */
 202         TCursor c;      /* cursor */
 203         int top;        /* top    scroll limit */
 204         int bot;        /* bottom scroll limit */
 205         int mode;       /* terminal mode flags */
 206         int esc;        /* escape state flags */
 207         bool numlock;   /* lock numbers in keyboard */
 208         bool *tabs;
 209 } Term;
 210
 211 /* Purely graphic info */
 212 typedef struct {
 213         Display *dpy;
 214         Colourmap cmap;
 215         Window win;
 216         Drawable buf;
 217         Atom xembed, wmdeletewin;
 218         XIM xim;
 219         XIC xic;
 220         Draw draw;
 221         Visual *vis;
 222         int scr;
 223         bool isfixed; /* is fixed geometry? */
 224         int fx, fy, fw, fh; /* fixed geometry */
 225         int tw, th; /* tty width and height */
 226         int w, h; /* window width and height */
 227         int ch; /* char height */
 228         int cw; /* char width  */
 229         char state; /* focus, redraw, visible */
 230 } XWindow;
 231
 232 typedef struct {
 233         int b;
 234         uint mask;
 235         char s[ESC_BUF_SIZ];
 236 } Mousekey;
 237
 238 typedef struct {
 239         KeySym k;
 240         uint mask;
 241         char s[ESC_BUF_SIZ];
 242         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 243         signed char appkey;             /* application keypad */
 244         signed char appcursor;          /* application cursor */
 245         signed char crlf;               /* crlf mode          */
 246 } Key;
 247
 248 /* TODO: use better name for vars... */
 249 typedef struct {
 250         int mode;
 251         int type;
 252         int snap;
 253         /*
 254          * Selection variables:
 255          * nb – normalized coordinates of the beginning of the selection
 256          * ne – normalized coordinates of the end of the selection
 257          * ob – original coordinates of the beginning of the selection
 258          * oe – original coordinates of the end of the selection
 259          */
 260         struct {
 261                 int x, y;
 262         } nb, ne, ob, oe;
 263
 264         char *clip;
 265         Atom xtarget;
 266         bool alt;
 267         struct timeval tclick1;
 268         struct timeval tclick2;
 269 } Selection;
 270
 271 typedef union {
 272         int i;
 273         unsigned int ui;
 274         float f;
 275         const void *v;
 276 } Arg;
 277
 278 typedef struct {
 279         unsigned int mod;
 280         KeySym keysym;
 281         void (*func)(const Arg *);
 282         const Arg arg;
 283 } Shortcut;
 284
 285 /* function definitions used in config.h */
 286 static void clippaste(const Arg *);
 287 static void numlock(const Arg *);
 288 static void selpaste(const Arg *);
 289 static void xzoom(const Arg *);
 290
 291 /* Config.h for applying patches and the configuration. */
 292 #include "config.h"
 293
 294 /* Font structure */
 295 typedef struct {
 296         int height;
 297         int width;
 298         int ascent;
 299         int descent;
 300         short lbearing;
 301         short rbearing;
 302         XftFont *match;
 303         FcFontSet *set;
 304         FcPattern *pattern;
 305 } Font;
 306
 307 /* Drawing Context */
 308 typedef struct {
 309         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 310         Font font, bfont, ifont, ibfont;
 311         GC gc;
 312 } DC;
 313
 314 static void die(const char *, ...);
 315 static void draw(void);
 316 static void redraw(int);
 317 static void drawregion(int, int, int, int);
 318 static void execsh(void);
 319 static void sigchld(int);
 320 static void run(void);
 321
 322 static void csidump(void);
 323 static void csihandle(void);
 324 static void csiparse(void);
 325 static void csireset(void);
 326 static void strdump(void);
 327 static void strhandle(void);
 328 static void strparse(void);
 329 static void strreset(void);
 330
 331 static int tattrset(int);
 332 static void tclearregion(int, int, int, int);
 333 static void tcursor(int);
 334 static void tdeletechar(int);
 335 static void tdeleteline(int);
 336 static void tinsertblank(int);
 337 static void tinsertblankline(int);
 338 static void tmoveto(int, int);
 339 static void tmoveato(int x, int y);
 340 static void tnew(int, int);
 341 static void tnewline(int);
 342 static void tputtab(bool);
 343 static void tputc(char *, int);
 344 static void treset(void);
 345 static int tresize(int, int);
 346 static void tscrollup(int, int);
 347 static void tscrolldown(int, int);
 348 static void tsetattr(int*, int);
 349 static void tsetchar(char *, Glyph *, int, int);
 350 static void tsetscroll(int, int);
 351 static void tswapscreen(void);
 352 static void tsetdirt(int, int);
 353 static void tsetdirtattr(int);
 354 static void tsetmode(bool, bool, int *, int);
 355 static void tfulldirt(void);
 356 static void techo(char *, int);
 357
 358 static inline bool match(uint, uint);
 359 static void ttynew(void);
 360 static void ttyread(void);
 361 static void ttyresize(void);
 362 static void ttywrite(const char *, size_t);
 363
 364 static void xdraws(char *, Glyph, int, int, int, int);
 365 static void xhints(void);
 366 static void xclear(int, int, int, int);
 367 static void xdrawcursor(void);
 368 static void xinit(void);
 369 static void xloadcols(void);
 370 static int xsetcolorname(int, const char *);
 371 static int xloadfont(Font *, FcPattern *);
 372 static void xloadfonts(char *, int);
 373 static int xloadfontset(Font *);
 374 static void xsettitle(char *);
 375 static void xresettitle(void);
 376 static void xseturgency(int);
 377 static void xsetsel(char*);
 378 static void xtermclear(int, int, int, int);
 379 static void xunloadfont(Font *f);
 380 static void xunloadfonts(void);
 381 static void xresize(int, int);
 382
 383 static void expose(XEvent *);
 384 static void visibility(XEvent *);
 385 static void unmap(XEvent *);
 386 static char *kmap(KeySym, uint);
 387 static void kpress(XEvent *);
 388 static void cmessage(XEvent *);
 389 static void cresize(int, int);
 390 static void resize(XEvent *);
 391 static void focus(XEvent *);
 392 static void brelease(XEvent *);
 393 static void bpress(XEvent *);
 394 static void bmotion(XEvent *);
 395 static void selnotify(XEvent *);
 396 static void selclear(XEvent *);
 397 static void selrequest(XEvent *);
 398
 399 static void selinit(void);
 400 static void selsort(void);
 401 static inline bool selected(int, int);
 402 static void selcopy(void);
 403 static void selscroll(int, int);
 404 static void selsnap(int, int *, int *, int);
 405
 406 static int utf8decode(char *, long *);
 407 static int utf8encode(long *, char *);
 408 static int utf8size(char *);
 409 static int isfullutf8(char *, int);
 410
 411 static ssize_t xwrite(int, char *, size_t);
 412 static void *xmalloc(size_t);
 413 static void *xrealloc(void *, size_t);
 414 static void *xcalloc(size_t, size_t);
 415
 416 static void (*handler[LASTEvent])(XEvent *) = {
 417         [KeyPress] = kpress,
 418         [ClientMessage] = cmessage,
 419         [ConfigureNotify] = resize,
 420         [VisibilityNotify] = visibility,
 421         [UnmapNotify] = unmap,
 422         [Expose] = expose,
 423         [FocusIn] = focus,
 424         [FocusOut] = focus,
 425         [MotionNotify] = bmotion,
 426         [ButtonPress] = bpress,
 427         [ButtonRelease] = brelease,
 428         [SelectionClear] = selclear,
 429         [SelectionNotify] = selnotify,
 430         [SelectionRequest] = selrequest,
 431 };
 432
 433 /* Globals */
 434 static DC dc;
 435 static XWindow xw;
 436 static Term term;
 437 static CSIEscape csiescseq;
 438 static STREscape strescseq;
 439 static int cmdfd;
 440 static pid_t pid;
 441 static Selection sel;
 442 static int iofd = -1;
 443 static char **opt_cmd = NULL;
 444 static char *opt_io = NULL;
 445 static char *opt_title = NULL;
 446 static char *opt_embed = NULL;
 447 static char *opt_class = NULL;
 448 static char *opt_font = NULL;
 449
 450 static char *usedfont = NULL;
 451 static int usedfontsize = 0;
 452
 453 /* Font Ring Cache */
 454 enum {
 455         FRC_NORMAL,
 456         FRC_ITALIC,
 457         FRC_BOLD,
 458         FRC_ITALICBOLD
 459 };
 460
 461 typedef struct {
 462         XftFont *font;
 463         long c;
 464         int flags;
 465 } Fontcache;
 466
 467 /*
 468  * Fontcache is a ring buffer, with frccur as current position and frclen as
 469  * the current length of used elements.
 470  */
 471
 472 static Fontcache frc[1024];
 473 static int frccur = -1, frclen = 0;
 474
 475 ssize_t
 476 xwrite(int fd, char *s, size_t len) {
 477         size_t aux = len;
 478
 479         while(len > 0) {
 480                 ssize_t r = write(fd, s, len);
 481                 if(r < 0)
 482                         return r;
 483                 len -= r;
 484                 s += r;
 485         }
 486         return aux;
 487 }
 488
 489 void *
 490 xmalloc(size_t len) {
 491         void *p = malloc(len);
 492
 493         if(!p)
 494                 die("Out of memory\n");
 495
 496         return p;
 497 }
 498
 499 void *
 500 xrealloc(void *p, size_t len) {
 501         if((p = realloc(p, len)) == NULL)
 502                 die("Out of memory\n");
 503
 504         return p;
 505 }
 506
 507 void *
 508 xcalloc(size_t nmemb, size_t size) {
 509         void *p = calloc(nmemb, size);
 510
 511         if(!p)
 512                 die("Out of memory\n");
 513
 514         return p;
 515 }
 516
 517 int
 518 utf8decode(char *s, long *u) {
 519         uchar c;
 520         int i, n, rtn;
 521
 522         rtn = 1;
 523         c = *s;
 524         if(~c & B7) { /* 0xxxxxxx */
 525                 *u = c;
 526                 return rtn;
 527         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 528                 *u = c&(B4|B3|B2|B1|B0);
 529                 n = 1;
 530         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 531                 *u = c&(B3|B2|B1|B0);
 532                 n = 2;
 533         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 534                 *u = c & (B2|B1|B0);
 535                 n = 3;
 536         } else {
 537                 goto invalid;
 538         }
 539
 540         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 541                 c = *s;
 542                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 543                         goto invalid;
 544                 *u <<= 6;
 545                 *u |= c & (B5|B4|B3|B2|B1|B0);
 546         }
 547
 548         if((n == 1 && *u < 0x80) ||
 549            (n == 2 && *u < 0x800) ||
 550            (n == 3 && *u < 0x10000) ||
 551            (*u >= 0xD800 && *u <= 0xDFFF)) {
 552                 goto invalid;
 553         }
 554
 555         return rtn;
 556 invalid:
 557         *u = 0xFFFD;
 558
 559         return rtn;
 560 }
 561
 562 int
 563 utf8encode(long *u, char *s) {
 564         uchar *sp;
 565         ulong uc;
 566         int i, n;
 567
 568         sp = (uchar *)s;
 569         uc = *u;
 570         if(uc < 0x80) {
 571                 *sp = uc; /* 0xxxxxxx */
 572                 return 1;
 573         } else if(*u < 0x800) {
 574                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 575                 n = 1;
 576         } else if(uc < 0x10000) {
 577                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 578                 n = 2;
 579         } else if(uc <= 0x10FFFF) {
 580                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 581                 n = 3;
 582         } else {
 583                 goto invalid;
 584         }
 585
 586         for(i=n,++sp; i>0; --i,++sp)
 587                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 588
 589         return n+1;
 590 invalid:
 591         /* U+FFFD */
 592         *s++ = '\xEF';
 593         *s++ = '\xBF';
 594         *s = '\xBD';
 595
 596         return 3;
 597 }
 598
 599 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 600    UTF-8 otherwise return 0 */
 601 int
 602 isfullutf8(char *s, int b) {
 603         uchar *c1, *c2, *c3;
 604
 605         c1 = (uchar *)s;
 606         c2 = (uchar *)++s;
 607         c3 = (uchar *)++s;
 608         if(b < 1) {
 609                 return 0;
 610         } else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1) {
 611                 return 0;
 612         } else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 613             ((b == 1) ||
 614             ((b == 2) && (*c2&(B7|B6)) == B7))) {
 615                 return 0;
 616         } else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 617             ((b == 1) ||
 618             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 619             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7))) {
 620                 return 0;
 621         } else {
 622                 return 1;
 623         }
 624 }
 625
 626 int
 627 utf8size(char *s) {
 628         uchar c = *s;
 629
 630         if(~c&B7) {
 631                 return 1;
 632         } else if((c&(B7|B6|B5)) == (B7|B6)) {
 633                 return 2;
 634         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) {
 635                 return 3;
 636         } else {
 637                 return 4;
 638         }
 639 }
 640
 641 static void
 642 selinit(void) {
 643         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 644         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 645         sel.mode = 0;
 646         sel.ob.x = -1;
 647         sel.clip = NULL;
 648         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 649         if(sel.xtarget == None)
 650                 sel.xtarget = XA_STRING;
 651 }
 652
 653 static int
 654 x2col(int x) {
 655         x -= borderpx;
 656         x /= xw.cw;
 657
 658         return LIMIT(x, 0, term.col-1);
 659 }
 660
 661 static int
 662 y2row(int y) {
 663         y -= borderpx;
 664         y /= xw.ch;
 665
 666         return LIMIT(y, 0, term.row-1);
 667 }
 668
 669 static void
 670 selsort(void) {
 671         if(sel.ob.y == sel.oe.y) {
 672                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 673                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 674         } else {
 675                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 676                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 677         }
 678         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 679         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 680 }
 681
 682 static inline bool
 683 selected(int x, int y) {
 684         if(sel.ne.y == y && sel.nb.y == y)
 685                 return BETWEEN(x, sel.nb.x, sel.ne.x);
 686
 687         if(sel.type == SEL_RECTANGULAR) {
 688                 return ((sel.nb.y <= y && y <= sel.ne.y)
 689                         && (sel.nb.x <= x && x <= sel.ne.x));
 690         }
 691
 692         return ((sel.nb.y < y && y < sel.ne.y)
 693                 || (y == sel.ne.y && x <= sel.ne.x))
 694                 || (y == sel.nb.y && x >= sel.nb.x
 695                         && (x <= sel.ne.x || sel.nb.y != sel.ne.y));
 696 }
 697
 698 void
 699 selsnap(int mode, int *x, int *y, int direction) {
 700         int i;
 701
 702         switch(mode) {
 703         case SNAP_WORD:
 704                 /*
 705                  * Snap around if the word wraps around at the end or
 706                  * beginning of a line.
 707                  */
 708                 for(;;) {
 709                         if(direction < 0 && *x <= 0) {
 710                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 711                                                 & ATTR_WRAP) {
 712                                         *y -= 1;
 713                                         *x = term.col-1;
 714                                 } else {
 715                                         break;
 716                                 }
 717                         }
 718                         if(direction > 0 && *x >= term.col-1) {
 719                                 if(*y < term.row-1 && term.line[*y][*x].mode
 720                                                 & ATTR_WRAP) {
 721                                         *y += 1;
 722                                         *x = 0;
 723                                 } else {
 724                                         break;
 725                                 }
 726                         }
 727
 728                         if(strchr(worddelimiters,
 729                                         term.line[*y][*x + direction].c[0])) {
 730                                 break;
 731                         }
 732
 733                         *x += direction;
 734                 }
 735                 break;
 736         case SNAP_LINE:
 737                 /*
 738                  * Snap around if the the previous line or the current one
 739                  * has set ATTR_WRAP at its end. Then the whole next or
 740                  * previous line will be selected.
 741                  */
 742                 *x = (direction < 0) ? 0 : term.col - 1;
 743                 if(direction < 0 && *y > 0) {
 744                         for(; *y > 0; *y += direction) {
 745                                 if(!(term.line[*y-1][term.col-1].mode
 746                                                 & ATTR_WRAP)) {
 747                                         break;
 748                                 }
 749                         }
 750                 } else if(direction > 0 && *y < term.row-1) {
 751                         for(; *y < term.row; *y += direction) {
 752                                 if(!(term.line[*y][term.col-1].mode
 753                                                 & ATTR_WRAP)) {
 754                                         break;
 755                                 }
 756                         }
 757                 }
 758                 break;
 759         default:
 760                 /*
 761                  * Select the whole line when the end of line is reached.
 762                  */
 763                 if(direction > 0) {
 764                         i = term.col;
 765                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 766                                 /* nothing */;
 767                         if(i > 0 && i < *x)
 768                                 *x = term.col - 1;
 769                 }
 770                 break;
 771         }
 772 }
 773
 774 void
 775 getbuttoninfo(XEvent *e) {
 776         int type;
 777         uint state = e->xbutton.state &~Button1Mask;
 778
 779         sel.alt = IS_SET(MODE_ALTSCREEN);
 780
 781         sel.oe.x = x2col(e->xbutton.x);
 782         sel.oe.y = y2row(e->xbutton.y);
 783
 784         if(sel.ob.y < sel.oe.y
 785                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 786                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 787                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 788         } else {
 789                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 790                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 791         }
 792         selsort();
 793
 794         sel.type = SEL_REGULAR;
 795         for(type = 1; type < LEN(selmasks); ++type) {
 796                 if(match(selmasks[type], state)) {
 797                         sel.type = type;
 798                         break;
 799                 }
 800         }
 801 }
 802
 803 void
 804 mousereport(XEvent *e) {
 805         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 806             button = e->xbutton.button, state = e->xbutton.state,
 807             len;
 808         char buf[40];
 809         static int ob, ox, oy;
 810
 811         /* from urxvt */
 812         if(e->xbutton.type == MotionNotify) {
 813                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 814                         return;
 815                 button = ob + 32;
 816                 ox = x;
 817                 oy = y;
 818         } else if(!IS_SET(MODE_MOUSESGR)
 819                         && (e->xbutton.type == ButtonRelease
 820                                 || button == AnyButton)) {
 821                 button = 3;
 822         } else {
 823                 button -= Button1;
 824                 if(button >= 3)
 825                         button += 64 - 3;
 826                 if(e->xbutton.type == ButtonPress) {
 827                         ob = button;
 828                         ox = x;
 829                         oy = y;
 830                 }
 831         }
 832
 833         button += (state & ShiftMask   ? 4  : 0)
 834                 + (state & Mod4Mask    ? 8  : 0)
 835                 + (state & ControlMask ? 16 : 0);
 836
 837         len = 0;
 838         if(IS_SET(MODE_MOUSESGR)) {
 839                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 840                                 button, x+1, y+1,
 841                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 842         } else if(x < 223 && y < 223) {
 843                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 844                                 32+button, 32+x+1, 32+y+1);
 845         } else {
 846                 return;
 847         }
 848
 849         ttywrite(buf, len);
 850 }
 851
 852 void
 853 bpress(XEvent *e) {
 854         struct timeval now;
 855         Mousekey *mk;
 856
 857         if(IS_SET(MODE_MOUSE)) {
 858                 mousereport(e);
 859                 return;
 860         }
 861
 862         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 863                 if(e->xbutton.button == mk->b
 864                                 && match(mk->mask, e->xbutton.state)) {
 865                         ttywrite(mk->s, strlen(mk->s));
 866                         if(IS_SET(MODE_ECHO))
 867                                 techo(mk->s, strlen(mk->s));
 868                         return;
 869                 }
 870         }
 871
 872         if(e->xbutton.button == Button1) {
 873                 gettimeofday(&now, NULL);
 874
 875                 /* Clear previous selection, logically and visually. */
 876                 if(sel.ob.x != -1) {
 877                         sel.ob.x = -1;
 878                         tsetdirt(sel.nb.y, sel.ne.y);
 879                         draw();
 880                 }
 881                 sel.mode = 1;
 882                 sel.type = SEL_REGULAR;
 883                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 884                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 885
 886                 /*
 887                  * If the user clicks below predefined timeouts specific
 888                  * snapping behaviour is exposed.
 889                  */
 890                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 891                         sel.snap = SNAP_LINE;
 892                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 893                         sel.snap = SNAP_WORD;
 894                 } else {
 895                         sel.snap = 0;
 896                 }
 897                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 898                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 899                 selsort();
 900
 901                 /*
 902                  * Draw selection, unless it's regular and we don't want to
 903                  * make clicks visible
 904                  */
 905                 if(sel.snap != 0) {
 906                         sel.mode++;
 907                         tsetdirt(sel.nb.y, sel.ne.y);
 908                         draw();
 909                 }
 910                 sel.tclick2 = sel.tclick1;
 911                 sel.tclick1 = now;
 912         }
 913 }
 914
 915 void
 916 selcopy(void) {
 917         char *str, *ptr;
 918         int x, y, bufsize, size, i, ex;
 919         Glyph *gp, *last;
 920
 921         if(sel.ob.x == -1) {
 922                 str = NULL;
 923         } else {
 924                 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 925                 ptr = str = xmalloc(bufsize);
 926
 927                 /* append every set & selected glyph to the selection */
 928                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 929                         gp = &term.line[y][0];
 930                         last = gp + term.col;
 931
 932                         while(--last >= gp && !(selected(last - gp, y) && \
 933                                                 strcmp(last->c, " ") != 0))
 934                                 /* nothing */;
 935
 936                         for(x = 0; gp <= last; x++, ++gp) {
 937                                 if(!selected(x, y))
 938                                         continue;
 939
 940                                 size = utf8size(gp->c);
 941                                 memcpy(ptr, gp->c, size);
 942                                 ptr += size;
 943                         }
 944
 945                         /*
 946                          * Copy and pasting of line endings is inconsistent
 947                          * in the inconsistent terminal and GUI world.
 948                          * The best solution seems like to produce '\n' when
 949                          * something is copied from st and convert '\n' to
 950                          * '\r', when something to be pasted is received by
 951                          * st.
 952                          * FIXME: Fix the computer world.
 953                          */
 954                         if(y < sel.ne.y && !((gp-1)->mode & ATTR_WRAP))
 955                                 *ptr++ = '\n';
 956
 957                         /*
 958                          * If the last selected line expands in the selection
 959                          * after the visible text '\n' is appended.
 960                          */
 961                         if(y == sel.ne.y) {
 962                                 i = term.col;
 963                                 while(--i > 0 && term.line[y][i].c[0] == ' ')
 964                                         /* nothing */;
 965                                 ex = sel.ne.x;
 966                                 if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 967                                         ex = sel.nb.x;
 968                                 if(i < ex)
 969                                         *ptr++ = '\n';
 970                         }
 971                 }
 972                 *ptr = 0;
 973         }
 974         xsetsel(str);
 975 }
 976
 977 void
 978 selnotify(XEvent *e) {
 979         ulong nitems, ofs, rem;
 980         int format;
 981         uchar *data, *last, *repl;
 982         Atom type;
 983
 984         ofs = 0;
 985         do {
 986                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 987                                         False, AnyPropertyType, &type, &format,
 988                                         &nitems, &rem, &data)) {
 989                         fprintf(stderr, "Clipboard allocation failed\n");
 990                         return;
 991                 }
 992
 993                 /*
 994                  * As seen in selcopy:
 995                  * Line endings are inconsistent in the terminal and GUI world
 996                  * copy and pasting. When receiving some selection data,
 997                  * replace all '\n' with '\r'.
 998                  * FIXME: Fix the computer world.
 999                  */
1000                 repl = data;
1001                 last = data + nitems * format / 8;
1002                 while((repl = memchr(repl, '\n', last - repl))) {
1003                         *repl++ = '\r';
1004                 }
1005
1006                 ttywrite((const char *)data, nitems * format / 8);
1007                 XFree(data);
1008                 /* number of 32-bit chunks returned */
1009                 ofs += nitems * format / 32;
1010         } while(rem > 0);
1011 }
1012
1013 void
1014 selpaste(const Arg *dummy) {
1015         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1016                         xw.win, CurrentTime);
1017 }
1018
1019 void
1020 clippaste(const Arg *dummy) {
1021         Atom clipboard;
1022
1023         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1024         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1025                         xw.win, CurrentTime);
1026 }
1027
1028 void
1029 selclear(XEvent *e) {
1030         if(sel.ob.x == -1)
1031                 return;
1032         sel.ob.x = -1;
1033         tsetdirt(sel.nb.y, sel.ne.y);
1034 }
1035
1036 void
1037 selrequest(XEvent *e) {
1038         XSelectionRequestEvent *xsre;
1039         XSelectionEvent xev;
1040         Atom xa_targets, string;
1041
1042         xsre = (XSelectionRequestEvent *) e;
1043         xev.type = SelectionNotify;
1044         xev.requestor = xsre->requestor;
1045         xev.selection = xsre->selection;
1046         xev.target = xsre->target;
1047         xev.time = xsre->time;
1048         /* reject */
1049         xev.property = None;
1050
1051         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1052         if(xsre->target == xa_targets) {
1053                 /* respond with the supported type */
1054                 string = sel.xtarget;
1055                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1056                                 XA_ATOM, 32, PropModeReplace,
1057                                 (uchar *) &string, 1);
1058                 xev.property = xsre->property;
1059         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1060                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1061                                 xsre->target, 8, PropModeReplace,
1062                                 (uchar *) sel.clip, strlen(sel.clip));
1063                 xev.property = xsre->property;
1064         }
1065
1066         /* all done, send a notification to the listener */
1067         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1068                 fprintf(stderr, "Error sending SelectionNotify event\n");
1069 }
1070
1071 void
1072 xsetsel(char *str) {
1073         /* register the selection for both the clipboard and the primary */
1074         Atom clipboard;
1075
1076         free(sel.clip);
1077         sel.clip = str;
1078
1079         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1080
1081         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1082         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1083 }
1084
1085 void
1086 brelease(XEvent *e) {
1087         if(IS_SET(MODE_MOUSE)) {
1088                 mousereport(e);
1089                 return;
1090         }
1091
1092         if(e->xbutton.button == Button2) {
1093                 selpaste(NULL);
1094         } else if(e->xbutton.button == Button1) {
1095                 if(sel.mode < 2) {
1096                         sel.ob.x = -1;
1097                 } else {
1098                         getbuttoninfo(e);
1099                         selcopy();
1100                 }
1101                 sel.mode = 0;
1102                 tsetdirt(sel.nb.y, sel.ne.y);
1103         }
1104 }
1105
1106 void
1107 bmotion(XEvent *e) {
1108         int oldey, oldex, oldsby, oldsey;
1109
1110         if(IS_SET(MODE_MOUSE)) {
1111                 mousereport(e);
1112                 return;
1113         }
1114
1115         if(!sel.mode)
1116                 return;
1117
1118         sel.mode++;
1119         oldey = sel.oe.y;
1120         oldex = sel.oe.x;
1121         oldsby = sel.nb.y;
1122         oldsey = sel.ne.y;
1123         getbuttoninfo(e);
1124
1125         if(oldey != sel.oe.y || oldex != sel.oe.x)
1126                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1127 }
1128
1129 void
1130 die(const char *errstr, ...) {
1131         va_list ap;
1132
1133         va_start(ap, errstr);
1134         vfprintf(stderr, errstr, ap);
1135         va_end(ap);
1136         exit(EXIT_FAILURE);
1137 }
1138
1139 void
1140 execsh(void) {
1141         char **args;
1142         char *envshell = getenv("SHELL");
1143         const struct passwd *pass = getpwuid(getuid());
1144         char buf[sizeof(long) * 8 + 1];
1145
1146         unsetenv("COLUMNS");
1147         unsetenv("LINES");
1148         unsetenv("TERMCAP");
1149
1150         if(pass) {
1151                 setenv("LOGNAME", pass->pw_name, 1);
1152                 setenv("USER", pass->pw_name, 1);
1153                 setenv("SHELL", pass->pw_shell, 0);
1154                 setenv("HOME", pass->pw_dir, 0);
1155         }
1156
1157         snprintf(buf, sizeof(buf), "%lu", xw.win);
1158         setenv("WINDOWID", buf, 1);
1159
1160         signal(SIGCHLD, SIG_DFL);
1161         signal(SIGHUP, SIG_DFL);
1162         signal(SIGINT, SIG_DFL);
1163         signal(SIGQUIT, SIG_DFL);
1164         signal(SIGTERM, SIG_DFL);
1165         signal(SIGALRM, SIG_DFL);
1166
1167         DEFAULT(envshell, shell);
1168         setenv("TERM", termname, 1);
1169         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1170         execvp(args[0], args);
1171         exit(EXIT_FAILURE);
1172 }
1173
1174 void
1175 sigchld(int a) {
1176         int stat = 0;
1177
1178         if(waitpid(pid, &stat, 0) < 0)
1179                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
1180
1181         if(WIFEXITED(stat)) {
1182                 exit(WEXITSTATUS(stat));
1183         } else {
1184                 exit(EXIT_FAILURE);
1185         }
1186 }
1187
1188 void
1189 ttynew(void) {
1190         int m, s;
1191         struct winsize w = {term.row, term.col, 0, 0};
1192
1193         /* seems to work fine on linux, openbsd and freebsd */
1194         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1195                 die("openpty failed: %s\n", SERRNO);
1196
1197         switch(pid = fork()) {
1198         case -1:
1199                 die("fork failed\n");
1200                 break;
1201         case 0:
1202                 setsid(); /* create a new process group */
1203                 dup2(s, STDIN_FILENO);
1204                 dup2(s, STDOUT_FILENO);
1205                 dup2(s, STDERR_FILENO);
1206                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1207                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
1208                 close(s);
1209                 close(m);
1210                 execsh();
1211                 break;
1212         default:
1213                 close(s);
1214                 cmdfd = m;
1215                 signal(SIGCHLD, sigchld);
1216                 if(opt_io) {
1217                         iofd = (!strcmp(opt_io, "-")) ?
1218                                   STDOUT_FILENO :
1219                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1220                         if(iofd < 0) {
1221                                 fprintf(stderr, "Error opening %s:%s\n",
1222                                         opt_io, strerror(errno));
1223                         }
1224                 }
1225         }
1226 }
1227
1228 void
1229 dump(char c) {
1230         static int col;
1231
1232         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1233         if(++col % 10 == 0)
1234                 fprintf(stderr, "\n");
1235 }
1236
1237 void
1238 ttyread(void) {
1239         static char buf[BUFSIZ];
1240         static int buflen = 0;
1241         char *ptr;
1242         char s[UTF_SIZ];
1243         int charsize; /* size of utf8 char in bytes */
1244         long utf8c;
1245         int ret;
1246
1247         /* append read bytes to unprocessed bytes */
1248         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1249                 die("Couldn't read from shell: %s\n", SERRNO);
1250
1251         /* process every complete utf8 char */
1252         buflen += ret;
1253         ptr = buf;
1254         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
1255                 charsize = utf8decode(ptr, &utf8c);
1256                 utf8encode(&utf8c, s);
1257                 tputc(s, charsize);
1258                 ptr += charsize;
1259                 buflen -= charsize;
1260         }
1261
1262         /* keep any uncomplete utf8 char for the next call */
1263         memmove(buf, ptr, buflen);
1264 }
1265
1266 void
1267 ttywrite(const char *s, size_t n) {
1268         if(write(cmdfd, s, n) == -1)
1269                 die("write error on tty: %s\n", SERRNO);
1270 }
1271
1272 void
1273 ttyresize(void) {
1274         struct winsize w;
1275
1276         w.ws_row = term.row;
1277         w.ws_col = term.col;
1278         w.ws_xpixel = xw.tw;
1279         w.ws_ypixel = xw.th;
1280         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1281                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
1282 }
1283
1284 int
1285 tattrset(int attr) {
1286         int i, j;
1287
1288         for(i = 0; i < term.row-1; i++) {
1289                 for(j = 0; j < term.col-1; j++) {
1290                         if(term.line[i][j].mode & attr)
1291                                 return 1;
1292                 }
1293         }
1294
1295         return 0;
1296 }
1297
1298 void
1299 tsetdirt(int top, int bot) {
1300         int i;
1301
1302         LIMIT(top, 0, term.row-1);
1303         LIMIT(bot, 0, term.row-1);
1304
1305         for(i = top; i <= bot; i++)
1306                 term.dirty[i] = 1;
1307 }
1308
1309 void
1310 tsetdirtattr(int attr) {
1311         int i, j;
1312
1313         for(i = 0; i < term.row-1; i++) {
1314                 for(j = 0; j < term.col-1; j++) {
1315                         if(term.line[i][j].mode & attr) {
1316                                 tsetdirt(i, i);
1317                                 break;
1318                         }
1319                 }
1320         }
1321 }
1322
1323 void
1324 tfulldirt(void) {
1325         tsetdirt(0, term.row-1);
1326 }
1327
1328 void
1329 tcursor(int mode) {
1330         static TCursor c;
1331
1332         if(mode == CURSOR_SAVE) {
1333                 c = term.c;
1334         } else if(mode == CURSOR_LOAD) {
1335                 term.c = c;
1336                 tmoveto(c.x, c.y);
1337         }
1338 }
1339
1340 void
1341 treset(void) {
1342         uint i;
1343
1344         term.c = (TCursor){{
1345                 .mode = ATTR_NULL,
1346                 .fg = defaultfg,
1347                 .bg = defaultbg
1348         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1349
1350         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1351         for(i = tabspaces; i < term.col; i += tabspaces)
1352                 term.tabs[i] = 1;
1353         term.top = 0;
1354         term.bot = term.row - 1;
1355         term.mode = MODE_WRAP;
1356
1357         tclearregion(0, 0, term.col-1, term.row-1);
1358         tmoveto(0, 0);
1359         tcursor(CURSOR_SAVE);
1360 }
1361
1362 void
1363 tnew(int col, int row) {
1364         memset(&term, 0, sizeof(Term));
1365         tresize(col, row);
1366         term.numlock = 1;
1367
1368         treset();
1369 }
1370
1371 void
1372 tswapscreen(void) {
1373         Line *tmp = term.line;
1374
1375         term.line = term.alt;
1376         term.alt = tmp;
1377         term.mode ^= MODE_ALTSCREEN;
1378         tfulldirt();
1379 }
1380
1381 void
1382 tscrolldown(int orig, int n) {
1383         int i;
1384         Line temp;
1385
1386         LIMIT(n, 0, term.bot-orig+1);
1387
1388         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1389
1390         for(i = term.bot; i >= orig+n; i--) {
1391                 temp = term.line[i];
1392                 term.line[i] = term.line[i-n];
1393                 term.line[i-n] = temp;
1394
1395                 term.dirty[i] = 1;
1396                 term.dirty[i-n] = 1;
1397         }
1398
1399         selscroll(orig, n);
1400 }
1401
1402 void
1403 tscrollup(int orig, int n) {
1404         int i;
1405         Line temp;
1406         LIMIT(n, 0, term.bot-orig+1);
1407
1408         tclearregion(0, orig, term.col-1, orig+n-1);
1409
1410         for(i = orig; i <= term.bot-n; i++) {
1411                  temp = term.line[i];
1412                  term.line[i] = term.line[i+n];
1413                  term.line[i+n] = temp;
1414
1415                  term.dirty[i] = 1;
1416                  term.dirty[i+n] = 1;
1417         }
1418
1419         selscroll(orig, -n);
1420 }
1421
1422 void
1423 selscroll(int orig, int n) {
1424         if(sel.ob.x == -1)
1425                 return;
1426
1427         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1428                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1429                         sel.ob.x = -1;
1430                         return;
1431                 }
1432                 if(sel.type == SEL_RECTANGULAR) {
1433                         if(sel.ob.y < term.top)
1434                                 sel.ob.y = term.top;
1435                         if(sel.oe.y > term.bot)
1436                                 sel.oe.y = term.bot;
1437                 } else {
1438                         if(sel.ob.y < term.top) {
1439                                 sel.ob.y = term.top;
1440                                 sel.ob.x = 0;
1441                         }
1442                         if(sel.oe.y > term.bot) {
1443                                 sel.oe.y = term.bot;
1444                                 sel.oe.x = term.col;
1445                         }
1446                 }
1447                 selsort();
1448         }
1449 }
1450
1451 void
1452 tnewline(int first_col) {
1453         int y = term.c.y;
1454
1455         if(y == term.bot) {
1456                 tscrollup(term.top, 1);
1457         } else {
1458                 y++;
1459         }
1460         tmoveto(first_col ? 0 : term.c.x, y);
1461 }
1462
1463 void
1464 csiparse(void) {
1465         char *p = csiescseq.buf, *np;
1466         long int v;
1467
1468         csiescseq.narg = 0;
1469         if(*p == '?') {
1470                 csiescseq.priv = 1;
1471                 p++;
1472         }
1473
1474         csiescseq.buf[csiescseq.len] = '\0';
1475         while(p < csiescseq.buf+csiescseq.len) {
1476                 np = NULL;
1477                 v = strtol(p, &np, 10);
1478                 if(np == p)
1479                         v = 0;
1480                 if(v == LONG_MAX || v == LONG_MIN)
1481                         v = -1;
1482                 csiescseq.arg[csiescseq.narg++] = v;
1483                 p = np;
1484                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1485                         break;
1486                 p++;
1487         }
1488         csiescseq.mode = *p;
1489 }
1490
1491 /* for absolute user moves, when decom is set */
1492 void
1493 tmoveato(int x, int y) {
1494         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1495 }
1496
1497 void
1498 tmoveto(int x, int y) {
1499         int miny, maxy;
1500
1501         if(term.c.state & CURSOR_ORIGIN) {
1502                 miny = term.top;
1503                 maxy = term.bot;
1504         } else {
1505                 miny = 0;
1506                 maxy = term.row - 1;
1507         }
1508         LIMIT(x, 0, term.col-1);
1509         LIMIT(y, miny, maxy);
1510         term.c.state &= ~CURSOR_WRAPNEXT;
1511         term.c.x = x;
1512         term.c.y = y;
1513 }
1514
1515 void
1516 tsetchar(char *c, Glyph *attr, int x, int y) {
1517         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1518                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1519                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1520                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1521                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1522                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1523                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1524                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1525                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1526         };
1527
1528         /*
1529          * The table is proudly stolen from rxvt.
1530          */
1531         if(attr->mode & ATTR_GFX) {
1532                 if(c[0] >= 0x41 && c[0] <= 0x7e
1533                                 && vt100_0[c[0] - 0x41]) {
1534                         c = vt100_0[c[0] - 0x41];
1535                 }
1536         }
1537
1538         term.dirty[y] = 1;
1539         term.line[y][x] = *attr;
1540         memcpy(term.line[y][x].c, c, UTF_SIZ);
1541 }
1542
1543 void
1544 tclearregion(int x1, int y1, int x2, int y2) {
1545         int x, y, temp;
1546
1547         if(x1 > x2)
1548                 temp = x1, x1 = x2, x2 = temp;
1549         if(y1 > y2)
1550                 temp = y1, y1 = y2, y2 = temp;
1551
1552         LIMIT(x1, 0, term.col-1);
1553         LIMIT(x2, 0, term.col-1);
1554         LIMIT(y1, 0, term.row-1);
1555         LIMIT(y2, 0, term.row-1);
1556
1557         for(y = y1; y <= y2; y++) {
1558                 term.dirty[y] = 1;
1559                 for(x = x1; x <= x2; x++) {
1560                         if(selected(x, y))
1561                                 selclear(NULL);
1562                         term.line[y][x] = term.c.attr;
1563                         memcpy(term.line[y][x].c, " ", 2);
1564                 }
1565         }
1566 }
1567
1568 void
1569 tdeletechar(int n) {
1570         int src = term.c.x + n;
1571         int dst = term.c.x;
1572         int size = term.col - src;
1573
1574         term.dirty[term.c.y] = 1;
1575
1576         if(src >= term.col) {
1577                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1578                 return;
1579         }
1580
1581         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1582                         size * sizeof(Glyph));
1583         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1584 }
1585
1586 void
1587 tinsertblank(int n) {
1588         int src = term.c.x;
1589         int dst = src + n;
1590         int size = term.col - dst;
1591
1592         term.dirty[term.c.y] = 1;
1593
1594         if(dst >= term.col) {
1595                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1596                 return;
1597         }
1598
1599         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1600                         size * sizeof(Glyph));
1601         tclearregion(src, term.c.y, dst - 1, term.c.y);
1602 }
1603
1604 void
1605 tinsertblankline(int n) {
1606         if(term.c.y < term.top || term.c.y > term.bot)
1607                 return;
1608
1609         tscrolldown(term.c.y, n);
1610 }
1611
1612 void
1613 tdeleteline(int n) {
1614         if(term.c.y < term.top || term.c.y > term.bot)
1615                 return;
1616
1617         tscrollup(term.c.y, n);
1618 }
1619
1620 void
1621 tsetattr(int *attr, int l) {
1622         int i;
1623
1624         for(i = 0; i < l; i++) {
1625                 switch(attr[i]) {
1626                 case 0:
1627                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1628                                         | ATTR_BOLD | ATTR_ITALIC \
1629                                         | ATTR_BLINK);
1630                         term.c.attr.fg = defaultfg;
1631                         term.c.attr.bg = defaultbg;
1632                         break;
1633                 case 1:
1634                         term.c.attr.mode |= ATTR_BOLD;
1635                         break;
1636                 case 3:
1637                         term.c.attr.mode |= ATTR_ITALIC;
1638                         break;
1639                 case 4:
1640                         term.c.attr.mode |= ATTR_UNDERLINE;
1641                         break;
1642                 case 5: /* slow blink */
1643                 case 6: /* rapid blink */
1644                         term.c.attr.mode |= ATTR_BLINK;
1645                         break;
1646                 case 7:
1647                         term.c.attr.mode |= ATTR_REVERSE;
1648                         break;
1649                 case 21:
1650                 case 22:
1651                         term.c.attr.mode &= ~ATTR_BOLD;
1652                         break;
1653                 case 23:
1654                         term.c.attr.mode &= ~ATTR_ITALIC;
1655                         break;
1656                 case 24:
1657                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1658                         break;
1659                 case 25:
1660                 case 26:
1661                         term.c.attr.mode &= ~ATTR_BLINK;
1662                         break;
1663                 case 27:
1664                         term.c.attr.mode &= ~ATTR_REVERSE;
1665                         break;
1666                 case 38:
1667                         if(i + 2 < l && attr[i + 1] == 5) {
1668                                 i += 2;
1669                                 if(BETWEEN(attr[i], 0, 255)) {
1670                                         term.c.attr.fg = attr[i];
1671                                 } else {
1672                                         fprintf(stderr,
1673                                                 "erresc: bad fgcolor %d\n",
1674                                                 attr[i]);
1675                                 }
1676                         } else {
1677                                 fprintf(stderr,
1678                                         "erresc(38): gfx attr %d unknown\n",
1679                                         attr[i]);
1680                         }
1681                         break;
1682                 case 39:
1683                         term.c.attr.fg = defaultfg;
1684                         break;
1685                 case 48:
1686                         if(i + 2 < l && attr[i + 1] == 5) {
1687                                 i += 2;
1688                                 if(BETWEEN(attr[i], 0, 255)) {
1689                                         term.c.attr.bg = attr[i];
1690                                 } else {
1691                                         fprintf(stderr,
1692                                                 "erresc: bad bgcolor %d\n",
1693                                                 attr[i]);
1694                                 }
1695                         } else {
1696                                 fprintf(stderr,
1697                                         "erresc(48): gfx attr %d unknown\n",
1698                                         attr[i]);
1699                         }
1700                         break;
1701                 case 49:
1702                         term.c.attr.bg = defaultbg;
1703                         break;
1704                 default:
1705                         if(BETWEEN(attr[i], 30, 37)) {
1706                                 term.c.attr.fg = attr[i] - 30;
1707                         } else if(BETWEEN(attr[i], 40, 47)) {
1708                                 term.c.attr.bg = attr[i] - 40;
1709                         } else if(BETWEEN(attr[i], 90, 97)) {
1710                                 term.c.attr.fg = attr[i] - 90 + 8;
1711                         } else if(BETWEEN(attr[i], 100, 107)) {
1712                                 term.c.attr.bg = attr[i] - 100 + 8;
1713                         } else {
1714                                 fprintf(stderr,
1715                                         "erresc(default): gfx attr %d unknown\n",
1716                                         attr[i]), csidump();
1717                         }
1718                         break;
1719                 }
1720         }
1721 }
1722
1723 void
1724 tsetscroll(int t, int b) {
1725         int temp;
1726
1727         LIMIT(t, 0, term.row-1);
1728         LIMIT(b, 0, term.row-1);
1729         if(t > b) {
1730                 temp = t;
1731                 t = b;
1732                 b = temp;
1733         }
1734         term.top = t;
1735         term.bot = b;
1736 }
1737
1738 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1739
1740 void
1741 tsetmode(bool priv, bool set, int *args, int narg) {
1742         int *lim, mode;
1743         bool alt;
1744
1745         for(lim = args + narg; args < lim; ++args) {
1746                 if(priv) {
1747                         switch(*args) {
1748                                 break;
1749                         case 1: /* DECCKM -- Cursor key */
1750                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1751                                 break;
1752                         case 5: /* DECSCNM -- Reverse video */
1753                                 mode = term.mode;
1754                                 MODBIT(term.mode, set, MODE_REVERSE);
1755                                 if(mode != term.mode)
1756                                         redraw(REDRAW_TIMEOUT);
1757                                 break;
1758                         case 6: /* DECOM -- Origin */
1759                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1760                                 tmoveato(0, 0);
1761                                 break;
1762                         case 7: /* DECAWM -- Auto wrap */
1763                                 MODBIT(term.mode, set, MODE_WRAP);
1764                                 break;
1765                         case 0:  /* Error (IGNORED) */
1766                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1767                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1768                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1769                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1770                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1771                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1772                         case 42: /* DECNRCM -- National characters (IGNORED) */
1773                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1774                                 break;
1775                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1776                                 MODBIT(term.mode, !set, MODE_HIDE);
1777                                 break;
1778                         case 1000: /* 1000,1002: enable xterm mouse report */
1779                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1780                                 MODBIT(term.mode, 0, MODE_MOUSEMOTION);
1781                                 break;
1782                         case 1002:
1783                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1784                                 MODBIT(term.mode, 0, MODE_MOUSEBTN);
1785                                 break;
1786                         case 1003: /* 1003: enable all mouse reports */
1787                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1788                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1789                                 break;
1790                         case 1004:
1791                                 MODBIT(term.mode, set, MODE_FOCUS);
1792                                 break;
1793                         case 1006:
1794                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1795                                 break;
1796                         case 1034:
1797                                 MODBIT(term.mode, set, MODE_8BIT);
1798                                 break;
1799                         case 1049: /* = 1047 and 1048 */
1800                         case 47:
1801                         case 1047:
1802                                 if (!allowaltscreen)
1803                                         break;
1804
1805                                 alt = IS_SET(MODE_ALTSCREEN);
1806                                 if(alt) {
1807                                         tclearregion(0, 0, term.col-1,
1808                                                         term.row-1);
1809                                 }
1810                                 if(set ^ alt)           /* set is always 1 or 0 */
1811                                         tswapscreen();
1812                                 if(*args != 1049)
1813                                         break;
1814                                 /* FALLTRU */
1815                         case 1048:
1816                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1817                                 break;
1818                         case 9: /* X10 compatibility mode */
1819                         case 1001: /* mouse highlight mode; can hang the
1820                                       terminal when implemented. */
1821                         default:
1822                                 fprintf(stderr,
1823                                         "erresc: unknown private set/reset mode %d\n",
1824                                         *args);
1825                                 break;
1826                         }
1827                 } else {
1828                         switch(*args) {
1829                         case 0:  /* Error (IGNORED) */
1830                                 break;
1831                         case 2:  /* KAM -- keyboard action */
1832                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1833                                 break;
1834                         case 4:  /* IRM -- Insertion-replacement */
1835                                 MODBIT(term.mode, set, MODE_INSERT);
1836                                 break;
1837                         case 12: /* SRM -- Send/Receive */
1838                                 MODBIT(term.mode, !set, MODE_ECHO);
1839                                 break;
1840                         case 20: /* LNM -- Linefeed/new line */
1841                                 MODBIT(term.mode, set, MODE_CRLF);
1842                                 break;
1843                         default:
1844                                 fprintf(stderr,
1845                                         "erresc: unknown set/reset mode %d\n",
1846                                         *args);
1847                                 break;
1848                         }
1849                 }
1850         }
1851 }
1852 #undef MODBIT
1853
1854
1855 void
1856 csihandle(void) {
1857         switch(csiescseq.mode) {
1858         default:
1859         unknown:
1860                 fprintf(stderr, "erresc: unknown csi ");
1861                 csidump();
1862                 /* die(""); */
1863                 break;
1864         case '@': /* ICH -- Insert <n> blank char */
1865                 DEFAULT(csiescseq.arg[0], 1);
1866                 tinsertblank(csiescseq.arg[0]);
1867                 break;
1868         case 'A': /* CUU -- Cursor <n> Up */
1869                 DEFAULT(csiescseq.arg[0], 1);
1870                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1871                 break;
1872         case 'B': /* CUD -- Cursor <n> Down */
1873         case 'e': /* VPR --Cursor <n> Down */
1874                 DEFAULT(csiescseq.arg[0], 1);
1875                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1876                 break;
1877         case 'c': /* DA -- Device Attributes */
1878                 if(csiescseq.arg[0] == 0)
1879                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1880                 break;
1881         case 'C': /* CUF -- Cursor <n> Forward */
1882         case 'a': /* HPR -- Cursor <n> Forward */
1883                 DEFAULT(csiescseq.arg[0], 1);
1884                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1885                 break;
1886         case 'D': /* CUB -- Cursor <n> Backward */
1887                 DEFAULT(csiescseq.arg[0], 1);
1888                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1889                 break;
1890         case 'E': /* CNL -- Cursor <n> Down and first col */
1891                 DEFAULT(csiescseq.arg[0], 1);
1892                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1893                 break;
1894         case 'F': /* CPL -- Cursor <n> Up and first col */
1895                 DEFAULT(csiescseq.arg[0], 1);
1896                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1897                 break;
1898         case 'g': /* TBC -- Tabulation clear */
1899                 switch(csiescseq.arg[0]) {
1900                 case 0: /* clear current tab stop */
1901                         term.tabs[term.c.x] = 0;
1902                         break;
1903                 case 3: /* clear all the tabs */
1904                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1905                         break;
1906                 default:
1907                         goto unknown;
1908                 }
1909                 break;
1910         case 'G': /* CHA -- Move to <col> */
1911         case '`': /* HPA */
1912                 DEFAULT(csiescseq.arg[0], 1);
1913                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1914                 break;
1915         case 'H': /* CUP -- Move to <row> <col> */
1916         case 'f': /* HVP */
1917                 DEFAULT(csiescseq.arg[0], 1);
1918                 DEFAULT(csiescseq.arg[1], 1);
1919                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1920                 break;
1921         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1922                 DEFAULT(csiescseq.arg[0], 1);
1923                 while(csiescseq.arg[0]--)
1924                         tputtab(1);
1925                 break;
1926         case 'J': /* ED -- Clear screen */
1927                 sel.ob.x = -1;
1928                 switch(csiescseq.arg[0]) {
1929                 case 0: /* below */
1930                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1931                         if(term.c.y < term.row-1) {
1932                                 tclearregion(0, term.c.y+1, term.col-1,
1933                                                 term.row-1);
1934                         }
1935                         break;
1936                 case 1: /* above */
1937                         if(term.c.y > 1)
1938                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1939                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1940                         break;
1941                 case 2: /* all */
1942                         tclearregion(0, 0, term.col-1, term.row-1);
1943                         break;
1944                 default:
1945                         goto unknown;
1946                 }
1947                 break;
1948         case 'K': /* EL -- Clear line */
1949                 switch(csiescseq.arg[0]) {
1950                 case 0: /* right */
1951                         tclearregion(term.c.x, term.c.y, term.col-1,
1952                                         term.c.y);
1953                         break;
1954                 case 1: /* left */
1955                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1956                         break;
1957                 case 2: /* all */
1958                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1959                         break;
1960                 }
1961                 break;
1962         case 'S': /* SU -- Scroll <n> line up */
1963                 DEFAULT(csiescseq.arg[0], 1);
1964                 tscrollup(term.top, csiescseq.arg[0]);
1965                 break;
1966         case 'T': /* SD -- Scroll <n> line down */
1967                 DEFAULT(csiescseq.arg[0], 1);
1968                 tscrolldown(term.top, csiescseq.arg[0]);
1969                 break;
1970         case 'L': /* IL -- Insert <n> blank lines */
1971                 DEFAULT(csiescseq.arg[0], 1);
1972                 tinsertblankline(csiescseq.arg[0]);
1973                 break;
1974         case 'l': /* RM -- Reset Mode */
1975                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1976                 break;
1977         case 'M': /* DL -- Delete <n> lines */
1978                 DEFAULT(csiescseq.arg[0], 1);
1979                 tdeleteline(csiescseq.arg[0]);
1980                 break;
1981         case 'X': /* ECH -- Erase <n> char */
1982                 DEFAULT(csiescseq.arg[0], 1);
1983                 tclearregion(term.c.x, term.c.y,
1984                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
1985                 break;
1986         case 'P': /* DCH -- Delete <n> char */
1987                 DEFAULT(csiescseq.arg[0], 1);
1988                 tdeletechar(csiescseq.arg[0]);
1989                 break;
1990         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1991                 DEFAULT(csiescseq.arg[0], 1);
1992                 while(csiescseq.arg[0]--)
1993                         tputtab(0);
1994                 break;
1995         case 'd': /* VPA -- Move to <row> */
1996                 DEFAULT(csiescseq.arg[0], 1);
1997                 tmoveato(term.c.x, csiescseq.arg[0]-1);
1998                 break;
1999         case 'h': /* SM -- Set terminal mode */
2000                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2001                 break;
2002         case 'm': /* SGR -- Terminal attribute (color) */
2003                 tsetattr(csiescseq.arg, csiescseq.narg);
2004                 break;
2005         case 'r': /* DECSTBM -- Set Scrolling Region */
2006                 if(csiescseq.priv) {
2007                         goto unknown;
2008                 } else {
2009                         DEFAULT(csiescseq.arg[0], 1);
2010                         DEFAULT(csiescseq.arg[1], term.row);
2011                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2012                         tmoveato(0, 0);
2013                 }
2014                 break;
2015         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2016                 tcursor(CURSOR_SAVE);
2017                 break;
2018         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2019                 tcursor(CURSOR_LOAD);
2020                 break;
2021         }
2022 }
2023
2024 void
2025 csidump(void) {
2026         int i;
2027         uint c;
2028
2029         printf("ESC[");
2030         for(i = 0; i < csiescseq.len; i++) {
2031                 c = csiescseq.buf[i] & 0xff;
2032                 if(isprint(c)) {
2033                         putchar(c);
2034                 } else if(c == '\n') {
2035                         printf("(\\n)");
2036                 } else if(c == '\r') {
2037                         printf("(\\r)");
2038                 } else if(c == 0x1b) {
2039                         printf("(\\e)");
2040                 } else {
2041                         printf("(%02x)", c);
2042                 }
2043         }
2044         putchar('\n');
2045 }
2046
2047 void
2048 csireset(void) {
2049         memset(&csiescseq, 0, sizeof(csiescseq));
2050 }
2051
2052 void
2053 strhandle(void) {
2054         char *p = NULL;
2055         int i, j, narg;
2056
2057         strparse();
2058         narg = strescseq.narg;
2059
2060         switch(strescseq.type) {
2061         case ']': /* OSC -- Operating System Command */
2062                 switch(i = atoi(strescseq.args[0])) {
2063                 case 0:
2064                 case 1:
2065                 case 2:
2066                         if(narg > 1)
2067                                 xsettitle(strescseq.args[1]);
2068                         break;
2069                 case 4: /* color set */
2070                         if(narg < 3)
2071                                 break;
2072                         p = strescseq.args[2];
2073                         /* fall through */
2074                 case 104: /* color reset, here p = NULL */
2075                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2076                         if (!xsetcolorname(j, p)) {
2077                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2078                         } else {
2079                                 /*
2080                                  * TODO if defaultbg color is changed, borders
2081                                  * are dirty
2082                                  */
2083                                 redraw(0);
2084                         }
2085                         break;
2086                 default:
2087                         fprintf(stderr, "erresc: unknown str ");
2088                         strdump();
2089                         break;
2090                 }
2091                 break;
2092         case 'k': /* old title set compatibility */
2093                 xsettitle(strescseq.args[0]);
2094                 break;
2095         case 'P': /* DSC -- Device Control String */
2096         case '_': /* APC -- Application Program Command */
2097         case '^': /* PM -- Privacy Message */
2098         default:
2099                 fprintf(stderr, "erresc: unknown str ");
2100                 strdump();
2101                 /* die(""); */
2102                 break;
2103         }
2104 }
2105
2106 void
2107 strparse(void) {
2108         char *p = strescseq.buf;
2109
2110         strescseq.narg = 0;
2111         strescseq.buf[strescseq.len] = '\0';
2112         while(p && strescseq.narg < STR_ARG_SIZ)
2113                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2114 }
2115
2116 void
2117 strdump(void) {
2118         int i;
2119         uint c;
2120
2121         printf("ESC%c", strescseq.type);
2122         for(i = 0; i < strescseq.len; i++) {
2123                 c = strescseq.buf[i] & 0xff;
2124                 if(c == '\0') {
2125                         return;
2126                 } else if(isprint(c)) {
2127                         putchar(c);
2128                 } else if(c == '\n') {
2129                         printf("(\\n)");
2130                 } else if(c == '\r') {
2131                         printf("(\\r)");
2132                 } else if(c == 0x1b) {
2133                         printf("(\\e)");
2134                 } else {
2135                         printf("(%02x)", c);
2136                 }
2137         }
2138         printf("ESC\\\n");
2139 }
2140
2141 void
2142 strreset(void) {
2143         memset(&strescseq, 0, sizeof(strescseq));
2144 }
2145
2146 void
2147 tputtab(bool forward) {
2148         uint x = term.c.x;
2149
2150         if(forward) {
2151                 if(x == term.col)
2152                         return;
2153                 for(++x; x < term.col && !term.tabs[x]; ++x)
2154                         /* nothing */ ;
2155         } else {
2156                 if(x == 0)
2157                         return;
2158                 for(--x; x > 0 && !term.tabs[x]; --x)
2159                         /* nothing */ ;
2160         }
2161         tmoveto(x, term.c.y);
2162 }
2163
2164 void
2165 techo(char *buf, int len) {
2166         for(; len > 0; buf++, len--) {
2167                 char c = *buf;
2168
2169                 if(c == '\033') {               /* escape */
2170                         tputc("^", 1);
2171                         tputc("[", 1);
2172                 } else if(c < '\x20') { /* control code */
2173                         if(c != '\n' && c != '\r' && c != '\t') {
2174                                 c |= '\x40';
2175                                 tputc("^", 1);
2176                         }
2177                         tputc(&c, 1);
2178                 } else {
2179                         break;
2180                 }
2181         }
2182         if(len)
2183                 tputc(buf, len);
2184 }
2185
2186 void
2187 tputc(char *c, int len) {
2188         uchar ascii = *c;
2189         bool control = ascii < '\x20' || ascii == 0177;
2190
2191         if(iofd != -1) {
2192                 if(xwrite(iofd, c, len) < 0) {
2193                         fprintf(stderr, "Error writing in %s:%s\n",
2194                                 opt_io, strerror(errno));
2195                         close(iofd);
2196                         iofd = -1;
2197                 }
2198         }
2199
2200         /*
2201          * STR sequences must be checked before anything else
2202          * because it can use some control codes as part of the sequence.
2203          */
2204         if(term.esc & ESC_STR) {
2205                 switch(ascii) {
2206                 case '\033':
2207                         term.esc = ESC_START | ESC_STR_END;
2208                         break;
2209                 case '\a': /* backwards compatibility to xterm */
2210                         term.esc = 0;
2211                         strhandle();
2212                         break;
2213                 default:
2214                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2215                                 memmove(&strescseq.buf[strescseq.len], c, len);
2216                                 strescseq.len += len;
2217                         } else {
2218                         /*
2219                          * Here is a bug in terminals. If the user never sends
2220                          * some code to stop the str or esc command, then st
2221                          * will stop responding. But this is better than
2222                          * silently failing with unknown characters. At least
2223                          * then users will report back.
2224                          *
2225                          * In the case users ever get fixed, here is the code:
2226                          */
2227                         /*
2228                          * term.esc = 0;
2229                          * strhandle();
2230                          */
2231                         }
2232                 }
2233                 return;
2234         }
2235
2236         /*
2237          * Actions of control codes must be performed as soon they arrive
2238          * because they can be embedded inside a control sequence, and
2239          * they must not cause conflicts with sequences.
2240          */
2241         if(control) {
2242                 switch(ascii) {
2243                 case '\t':      /* HT */
2244                         tputtab(1);
2245                         return;
2246                 case '\b':      /* BS */
2247                         tmoveto(term.c.x-1, term.c.y);
2248                         return;
2249                 case '\r':      /* CR */
2250                         tmoveto(0, term.c.y);
2251                         return;
2252                 case '\f':      /* LF */
2253                 case '\v':      /* VT */
2254                 case '\n':      /* LF */
2255                         /* go to first col if the mode is set */
2256                         tnewline(IS_SET(MODE_CRLF));
2257                         return;
2258                 case '\a':      /* BEL */
2259                         if(!(xw.state & WIN_FOCUSED))
2260                                 xseturgency(1);
2261                         return;
2262                 case '\033':    /* ESC */
2263                         csireset();
2264                         term.esc = ESC_START;
2265                         return;
2266                 case '\016':    /* SO */
2267                 case '\017':    /* SI */
2268                         /*
2269                          * Different charsets are hard to handle. Applications
2270                          * should use the right alt charset escapes for the
2271                          * only reason they still exist: line drawing. The
2272                          * rest is incompatible history st should not support.
2273                          */
2274                         return;
2275                 case '\032':    /* SUB */
2276                 case '\030':    /* CAN */
2277                         csireset();
2278                         return;
2279                 case '\005':    /* ENQ (IGNORED) */
2280                 case '\000':    /* NUL (IGNORED) */
2281                 case '\021':    /* XON (IGNORED) */
2282                 case '\023':    /* XOFF (IGNORED) */
2283                 case 0177:      /* DEL (IGNORED) */
2284                         return;
2285                 }
2286         } else if(term.esc & ESC_START) {
2287                 if(term.esc & ESC_CSI) {
2288                         csiescseq.buf[csiescseq.len++] = ascii;
2289                         if(BETWEEN(ascii, 0x40, 0x7E)
2290                                         || csiescseq.len >= \
2291                                         sizeof(csiescseq.buf)-1) {
2292                                 term.esc = 0;
2293                                 csiparse();
2294                                 csihandle();
2295                         }
2296                 } else if(term.esc & ESC_STR_END) {
2297                         term.esc = 0;
2298                         if(ascii == '\\')
2299                                 strhandle();
2300                 } else if(term.esc & ESC_ALTCHARSET) {
2301                         switch(ascii) {
2302                         case '0': /* Line drawing set */
2303                                 term.c.attr.mode |= ATTR_GFX;
2304                                 break;
2305                         case 'B': /* USASCII */
2306                                 term.c.attr.mode &= ~ATTR_GFX;
2307                                 break;
2308                         case 'A': /* UK (IGNORED) */
2309                         case '<': /* multinational charset (IGNORED) */
2310                         case '5': /* Finnish (IGNORED) */
2311                         case 'C': /* Finnish (IGNORED) */
2312                         case 'K': /* German (IGNORED) */
2313                                 break;
2314                         default:
2315                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2316                         }
2317                         term.esc = 0;
2318                 } else if(term.esc & ESC_TEST) {
2319                         if(ascii == '8') { /* DEC screen alignment test. */
2320                                 char E[UTF_SIZ] = "E";
2321                                 int x, y;
2322
2323                                 for(x = 0; x < term.col; ++x) {
2324                                         for(y = 0; y < term.row; ++y)
2325                                                 tsetchar(E, &term.c.attr, x, y);
2326                                 }
2327                         }
2328                         term.esc = 0;
2329                 } else {
2330                         switch(ascii) {
2331                         case '[':
2332                                 term.esc |= ESC_CSI;
2333                                 break;
2334                         case '#':
2335                                 term.esc |= ESC_TEST;
2336                                 break;
2337                         case 'P': /* DCS -- Device Control String */
2338                         case '_': /* APC -- Application Program Command */
2339                         case '^': /* PM -- Privacy Message */
2340                         case ']': /* OSC -- Operating System Command */
2341                         case 'k': /* old title set compatibility */
2342                                 strreset();
2343                                 strescseq.type = ascii;
2344                                 term.esc |= ESC_STR;
2345                                 break;
2346                         case '(': /* set primary charset G0 */
2347                                 term.esc |= ESC_ALTCHARSET;
2348                                 break;
2349                         case ')': /* set secondary charset G1 (IGNORED) */
2350                         case '*': /* set tertiary charset G2 (IGNORED) */
2351                         case '+': /* set quaternary charset G3 (IGNORED) */
2352                                 term.esc = 0;
2353                                 break;
2354                         case 'D': /* IND -- Linefeed */
2355                                 if(term.c.y == term.bot) {
2356                                         tscrollup(term.top, 1);
2357                                 } else {
2358                                         tmoveto(term.c.x, term.c.y+1);
2359                                 }
2360                                 term.esc = 0;
2361                                 break;
2362                         case 'E': /* NEL -- Next line */
2363                                 tnewline(1); /* always go to first col */
2364                                 term.esc = 0;
2365                                 break;
2366                         case 'H': /* HTS -- Horizontal tab stop */
2367                                 term.tabs[term.c.x] = 1;
2368                                 term.esc = 0;
2369                                 break;
2370                         case 'M': /* RI -- Reverse index */
2371                                 if(term.c.y == term.top) {
2372                                         tscrolldown(term.top, 1);
2373                                 } else {
2374                                         tmoveto(term.c.x, term.c.y-1);
2375                                 }
2376                                 term.esc = 0;
2377                                 break;
2378                         case 'Z': /* DECID -- Identify Terminal */
2379                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2380                                 term.esc = 0;
2381                                 break;
2382                         case 'c': /* RIS -- Reset to inital state */
2383                                 treset();
2384                                 term.esc = 0;
2385                                 xresettitle();
2386                                 break;
2387                         case '=': /* DECPAM -- Application keypad */
2388                                 term.mode |= MODE_APPKEYPAD;
2389                                 term.esc = 0;
2390                                 break;
2391                         case '>': /* DECPNM -- Normal keypad */
2392                                 term.mode &= ~MODE_APPKEYPAD;
2393                                 term.esc = 0;
2394                                 break;
2395                         case '7': /* DECSC -- Save Cursor */
2396                                 tcursor(CURSOR_SAVE);
2397                                 term.esc = 0;
2398                                 break;
2399                         case '8': /* DECRC -- Restore Cursor */
2400                                 tcursor(CURSOR_LOAD);
2401                                 term.esc = 0;
2402                                 break;
2403                         case '\\': /* ST -- Stop */
2404                                 term.esc = 0;
2405                                 break;
2406                         default:
2407                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2408                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2409                                 term.esc = 0;
2410                         }
2411                 }
2412                 /*
2413                  * All characters which form part of a sequence are not
2414                  * printed
2415                  */
2416                 return;
2417         }
2418         /*
2419          * Display control codes only if we are in graphic mode
2420          */
2421         if(control && !(term.c.attr.mode & ATTR_GFX))
2422                 return;
2423         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2424                 sel.ob.x = -1;
2425         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2426                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2427                 tnewline(1);
2428         }
2429
2430         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2431                 memmove(&term.line[term.c.y][term.c.x+1],
2432                         &term.line[term.c.y][term.c.x],
2433                         (term.col - term.c.x - 1) * sizeof(Glyph));
2434         }
2435
2436         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2437         if(term.c.x+1 < term.col) {
2438                 tmoveto(term.c.x+1, term.c.y);
2439         } else {
2440                 term.c.state |= CURSOR_WRAPNEXT;
2441         }
2442 }
2443
2444 int
2445 tresize(int col, int row) {
2446         int i;
2447         int minrow = MIN(row, term.row);
2448         int mincol = MIN(col, term.col);
2449         int slide = term.c.y - row + 1;
2450         bool *bp;
2451         Line *orig;
2452
2453         if(col < 1 || row < 1)
2454                 return 0;
2455
2456         /* free unneeded rows */
2457         i = 0;
2458         if(slide > 0) {
2459                 /*
2460                  * slide screen to keep cursor where we expect it -
2461                  * tscrollup would work here, but we can optimize to
2462                  * memmove because we're freeing the earlier lines
2463                  */
2464                 for(/* i = 0 */; i < slide; i++) {
2465                         free(term.line[i]);
2466                         free(term.alt[i]);
2467                 }
2468                 memmove(term.line, term.line + slide, row * sizeof(Line));
2469                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2470         }
2471         for(i += row; i < term.row; i++) {
2472                 free(term.line[i]);
2473                 free(term.alt[i]);
2474         }
2475
2476         /* resize to new height */
2477         term.line = xrealloc(term.line, row * sizeof(Line));
2478         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2479         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2480         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2481
2482         /* resize each row to new width, zero-pad if needed */
2483         for(i = 0; i < minrow; i++) {
2484                 term.dirty[i] = 1;
2485                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2486                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2487         }
2488
2489         /* allocate any new rows */
2490         for(/* i == minrow */; i < row; i++) {
2491                 term.dirty[i] = 1;
2492                 term.line[i] = xcalloc(col, sizeof(Glyph));
2493                 term.alt [i] = xcalloc(col, sizeof(Glyph));
2494         }
2495         if(col > term.col) {
2496                 bp = term.tabs + term.col;
2497
2498                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2499                 while(--bp > term.tabs && !*bp)
2500                         /* nothing */ ;
2501                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2502                         *bp = 1;
2503         }
2504         /* update terminal size */
2505         term.col = col;
2506         term.row = row;
2507         /* reset scrolling region */
2508         tsetscroll(0, row-1);
2509         /* make use of the LIMIT in tmoveto */
2510         tmoveto(term.c.x, term.c.y);
2511         /* Clearing both screens */
2512         orig = term.line;
2513         do {
2514                 if(mincol < col && 0 < minrow) {
2515                         tclearregion(mincol, 0, col - 1, minrow - 1);
2516                 }
2517                 if(0 < col && minrow < row) {
2518                         tclearregion(0, minrow, col - 1, row - 1);
2519                 }
2520                 tswapscreen();
2521         } while(orig != term.line);
2522
2523         return (slide > 0);
2524 }
2525
2526 void
2527 xresize(int col, int row) {
2528         xw.tw = MAX(1, col * xw.cw);
2529         xw.th = MAX(1, row * xw.ch);
2530
2531         XFreePixmap(xw.dpy, xw.buf);
2532         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2533                         DefaultDepth(xw.dpy, xw.scr));
2534         XftDrawChange(xw.draw, xw.buf);
2535         xclear(0, 0, xw.w, xw.h);
2536 }
2537
2538 static inline ushort
2539 sixd_to_16bit(int x) {
2540         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2541 }
2542
2543 void
2544 xloadcols(void) {
2545         int i, r, g, b;
2546         XRenderColor color = { .alpha = 0xffff };
2547
2548         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2549         for(i = 0; i < LEN(colorname); i++) {
2550                 if(!colorname[i])
2551                         continue;
2552                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2553                         die("Could not allocate color '%s'\n", colorname[i]);
2554                 }
2555         }
2556
2557         /* load colors [16-255] ; same colors as xterm */
2558         for(i = 16, r = 0; r < 6; r++) {
2559                 for(g = 0; g < 6; g++) {
2560                         for(b = 0; b < 6; b++) {
2561                                 color.red = sixd_to_16bit(r);
2562                                 color.green = sixd_to_16bit(g);
2563                                 color.blue = sixd_to_16bit(b);
2564                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2565                                         die("Could not allocate color %d\n", i);
2566                                 }
2567                                 i++;
2568                         }
2569                 }
2570         }
2571
2572         for(r = 0; r < 24; r++, i++) {
2573                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2574                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2575                                         &dc.col[i])) {
2576                         die("Could not allocate color %d\n", i);
2577                 }
2578         }
2579 }
2580
2581 int
2582 xsetcolorname(int x, const char *name) {
2583         XRenderColor color = { .alpha = 0xffff };
2584         Colour colour;
2585         if (x < 0 || x > LEN(colorname))
2586                 return -1;
2587         if(!name) {
2588                 if(16 <= x && x < 16 + 216) {
2589                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2590                         color.red = sixd_to_16bit(r);
2591                         color.green = sixd_to_16bit(g);
2592                         color.blue = sixd_to_16bit(b);
2593                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2594                                 return 0; /* something went wrong */
2595                         dc.col[x] = colour;
2596                         return 1;
2597                 } else if (16 + 216 <= x && x < 256) {
2598                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2599                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2600                                 return 0; /* something went wrong */
2601                         dc.col[x] = colour;
2602                         return 1;
2603                 } else {
2604                         name = colorname[x];
2605                 }
2606         }
2607         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2608                 return 0;
2609         dc.col[x] = colour;
2610         return 1;
2611 }
2612
2613 void
2614 xtermclear(int col1, int row1, int col2, int row2) {
2615         XftDrawRect(xw.draw,
2616                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2617                         borderpx + col1 * xw.cw,
2618                         borderpx + row1 * xw.ch,
2619                         (col2-col1+1) * xw.cw,
2620                         (row2-row1+1) * xw.ch);
2621 }
2622
2623 /*
2624  * Absolute coordinates.
2625  */
2626 void
2627 xclear(int x1, int y1, int x2, int y2) {
2628         XftDrawRect(xw.draw,
2629                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2630                         x1, y1, x2-x1, y2-y1);
2631 }
2632
2633 void
2634 xhints(void) {
2635         XClassHint class = {opt_class ? opt_class : termname, termname};
2636         XWMHints wm = {.flags = InputHint, .input = 1};
2637         XSizeHints *sizeh = NULL;
2638
2639         sizeh = XAllocSizeHints();
2640         if(xw.isfixed == False) {
2641                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2642                 sizeh->height = xw.h;
2643                 sizeh->width = xw.w;
2644                 sizeh->height_inc = xw.ch;
2645                 sizeh->width_inc = xw.cw;
2646                 sizeh->base_height = 2 * borderpx;
2647                 sizeh->base_width = 2 * borderpx;
2648         } else {
2649                 sizeh->flags = PMaxSize | PMinSize;
2650                 sizeh->min_width = sizeh->max_width = xw.fw;
2651                 sizeh->min_height = sizeh->max_height = xw.fh;
2652         }
2653
2654         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2655         XFree(sizeh);
2656 }
2657
2658 int
2659 xloadfont(Font *f, FcPattern *pattern) {
2660         FcPattern *match;
2661         FcResult result;
2662
2663         match = FcFontMatch(NULL, pattern, &result);
2664         if(!match)
2665                 return 1;
2666
2667         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2668                 FcPatternDestroy(match);
2669                 return 1;
2670         }
2671
2672         f->set = NULL;
2673         f->pattern = FcPatternDuplicate(pattern);
2674
2675         f->ascent = f->match->ascent;
2676         f->descent = f->match->descent;
2677         f->lbearing = 0;
2678         f->rbearing = f->match->max_advance_width;
2679
2680         f->height = f->ascent + f->descent;
2681         f->width = f->lbearing + f->rbearing;
2682
2683         return 0;
2684 }
2685
2686 void
2687 xloadfonts(char *fontstr, int fontsize) {
2688         FcPattern *pattern;
2689         FcResult result;
2690         double fontval;
2691
2692         if(fontstr[0] == '-') {
2693                 pattern = XftXlfdParse(fontstr, False, False);
2694         } else {
2695                 pattern = FcNameParse((FcChar8 *)fontstr);
2696         }
2697
2698         if(!pattern)
2699                 die("st: can't open font %s\n", fontstr);
2700
2701         if(fontsize > 0) {
2702                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2703                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2704                 usedfontsize = fontsize;
2705         } else {
2706                 result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2707                 if(result == FcResultMatch) {
2708                         usedfontsize = (int)fontval;
2709                 } else {
2710                         /*
2711                          * Default font size is 12, if none given. This is to
2712                          * have a known usedfontsize value.
2713                          */
2714                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2715                         usedfontsize = 12;
2716                 }
2717         }
2718
2719         FcConfigSubstitute(0, pattern, FcMatchPattern);
2720         FcDefaultSubstitute(pattern);
2721
2722         if(xloadfont(&dc.font, pattern))
2723                 die("st: can't open font %s\n", fontstr);
2724
2725         /* Setting character width and height. */
2726         xw.cw = dc.font.width;
2727         xw.ch = dc.font.height;
2728
2729         FcPatternDel(pattern, FC_SLANT);
2730         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2731         if(xloadfont(&dc.ifont, pattern))
2732                 die("st: can't open font %s\n", fontstr);
2733
2734         FcPatternDel(pattern, FC_WEIGHT);
2735         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2736         if(xloadfont(&dc.ibfont, pattern))
2737                 die("st: can't open font %s\n", fontstr);
2738
2739         FcPatternDel(pattern, FC_SLANT);
2740         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2741         if(xloadfont(&dc.bfont, pattern))
2742                 die("st: can't open font %s\n", fontstr);
2743
2744         FcPatternDestroy(pattern);
2745 }
2746
2747 int
2748 xloadfontset(Font *f) {
2749         FcResult result;
2750
2751         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2752                 return 1;
2753         return 0;
2754 }
2755
2756 void
2757 xunloadfont(Font *f) {
2758         XftFontClose(xw.dpy, f->match);
2759         FcPatternDestroy(f->pattern);
2760         if(f->set)
2761                 FcFontSetDestroy(f->set);
2762 }
2763
2764 void
2765 xunloadfonts(void) {
2766         int i, ip;
2767
2768         /*
2769          * Free the loaded fonts in the font cache. This is done backwards
2770          * from the frccur.
2771          */
2772         for(i = 0, ip = frccur; i < frclen; i++, ip--) {
2773                 if(ip < 0)
2774                         ip = LEN(frc) - 1;
2775                 XftFontClose(xw.dpy, frc[ip].font);
2776         }
2777         frccur = -1;
2778         frclen = 0;
2779
2780         xunloadfont(&dc.font);
2781         xunloadfont(&dc.bfont);
2782         xunloadfont(&dc.ifont);
2783         xunloadfont(&dc.ibfont);
2784 }
2785
2786 void
2787 xzoom(const Arg *arg) {
2788         xunloadfonts();
2789         xloadfonts(usedfont, usedfontsize + arg->i);
2790         cresize(0, 0);
2791         redraw(0);
2792 }
2793
2794 void
2795 xinit(void) {
2796         XSetWindowAttributes attrs;
2797         XGCValues gcvalues;
2798         Cursor cursor;
2799         Window parent;
2800         int sw, sh;
2801
2802         if(!(xw.dpy = XOpenDisplay(NULL)))
2803                 die("Can't open display\n");
2804         xw.scr = XDefaultScreen(xw.dpy);
2805         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2806
2807         /* font */
2808         if(!FcInit())
2809                 die("Could not init fontconfig.\n");
2810
2811         usedfont = (opt_font == NULL)? font : opt_font;
2812         xloadfonts(usedfont, 0);
2813
2814         /* colors */
2815         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2816         xloadcols();
2817
2818         /* adjust fixed window geometry */
2819         if(xw.isfixed) {
2820                 sw = DisplayWidth(xw.dpy, xw.scr);
2821                 sh = DisplayHeight(xw.dpy, xw.scr);
2822                 if(xw.fx < 0)
2823                         xw.fx = sw + xw.fx - xw.fw - 1;
2824                 if(xw.fy < 0)
2825                         xw.fy = sh + xw.fy - xw.fh - 1;
2826
2827                 xw.h = xw.fh;
2828                 xw.w = xw.fw;
2829         } else {
2830                 /* window - default size */
2831                 xw.h = 2 * borderpx + term.row * xw.ch;
2832                 xw.w = 2 * borderpx + term.col * xw.cw;
2833                 xw.fx = 0;
2834                 xw.fy = 0;
2835         }
2836
2837         /* Events */
2838         attrs.background_pixel = dc.col[defaultbg].pixel;
2839         attrs.border_pixel = dc.col[defaultbg].pixel;
2840         attrs.bit_gravity = NorthWestGravity;
2841         attrs.event_mask = FocusChangeMask | KeyPressMask
2842                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2843                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2844         attrs.colormap = xw.cmap;
2845
2846         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
2847                         XRootWindow(xw.dpy, xw.scr);
2848         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2849                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2850                         xw.vis,
2851                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2852                         | CWColormap,
2853                         &attrs);
2854
2855         memset(&gcvalues, 0, sizeof(gcvalues));
2856         gcvalues.graphics_exposures = False;
2857         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
2858                         &gcvalues);
2859         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2860                         DefaultDepth(xw.dpy, xw.scr));
2861         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
2862         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
2863
2864         /* Xft rendering context */
2865         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2866
2867         /* input methods */
2868         if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2869                 XSetLocaleModifiers("@im=local");
2870                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2871                         XSetLocaleModifiers("@im=");
2872                         if((xw.xim = XOpenIM(xw.dpy,
2873                                         NULL, NULL, NULL)) == NULL) {
2874                                 die("XOpenIM failed. Could not open input"
2875                                         " device.\n");
2876                         }
2877                 }
2878         }
2879         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2880                                            | XIMStatusNothing, XNClientWindow, xw.win,
2881                                            XNFocusWindow, xw.win, NULL);
2882         if(xw.xic == NULL)
2883                 die("XCreateIC failed. Could not obtain input method.\n");
2884
2885         /* white cursor, black outline */
2886         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2887         XDefineCursor(xw.dpy, xw.win, cursor);
2888         XRecolorCursor(xw.dpy, cursor,
2889                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2890                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2891
2892         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2893         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2894         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2895
2896         xresettitle();
2897         XMapWindow(xw.dpy, xw.win);
2898         xhints();
2899         XSync(xw.dpy, 0);
2900 }
2901
2902 void
2903 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2904         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
2905             width = charlen * xw.cw, xp, i;
2906         int frp, frcflags;
2907         int u8fl, u8fblen, u8cblen, doesexist;
2908         char *u8c, *u8fs;
2909         long u8char;
2910         Font *font = &dc.font;
2911         FcResult fcres;
2912         FcPattern *fcpattern, *fontpattern;
2913         FcFontSet *fcsets[] = { NULL };
2914         FcCharSet *fccharset;
2915         Colour *fg, *bg, *temp, revfg, revbg;
2916         XRenderColor colfg, colbg;
2917         Rectangle r;
2918
2919         frcflags = FRC_NORMAL;
2920
2921         if(base.mode & ATTR_ITALIC) {
2922                 if(base.fg == defaultfg)
2923                         base.fg = defaultitalic;
2924                 font = &dc.ifont;
2925                 frcflags = FRC_ITALIC;
2926         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
2927                 if(base.fg == defaultfg)
2928                         base.fg = defaultitalic;
2929                 font = &dc.ibfont;
2930                 frcflags = FRC_ITALICBOLD;
2931         } else if(base.mode & ATTR_UNDERLINE) {
2932                 if(base.fg == defaultfg)
2933                         base.fg = defaultunderline;
2934         }
2935         fg = &dc.col[base.fg];
2936         bg = &dc.col[base.bg];
2937
2938         if(base.mode & ATTR_BOLD) {
2939                 if(BETWEEN(base.fg, 0, 7)) {
2940                         /* basic system colors */
2941                         fg = &dc.col[base.fg + 8];
2942                 } else if(BETWEEN(base.fg, 16, 195)) {
2943                         /* 256 colors */
2944                         fg = &dc.col[base.fg + 36];
2945                 } else if(BETWEEN(base.fg, 232, 251)) {
2946                         /* greyscale */
2947                         fg = &dc.col[base.fg + 4];
2948                 }
2949                 /*
2950                  * Those ranges will not be brightened:
2951                  *      8 - 15 – bright system colors
2952                  *      196 - 231 – highest 256 color cube
2953                  *      252 - 255 – brightest colors in greyscale
2954                  */
2955                 font = &dc.bfont;
2956                 frcflags = FRC_BOLD;
2957         }
2958
2959         if(IS_SET(MODE_REVERSE)) {
2960                 if(fg == &dc.col[defaultfg]) {
2961                         fg = &dc.col[defaultbg];
2962                 } else {
2963                         colfg.red = ~fg->color.red;
2964                         colfg.green = ~fg->color.green;
2965                         colfg.blue = ~fg->color.blue;
2966                         colfg.alpha = fg->color.alpha;
2967                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
2968                         fg = &revfg;
2969                 }
2970
2971                 if(bg == &dc.col[defaultbg]) {
2972                         bg = &dc.col[defaultfg];
2973                 } else {
2974                         colbg.red = ~bg->color.red;
2975                         colbg.green = ~bg->color.green;
2976                         colbg.blue = ~bg->color.blue;
2977                         colbg.alpha = bg->color.alpha;
2978                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
2979                         bg = &revbg;
2980                 }
2981         }
2982
2983         if(base.mode & ATTR_REVERSE) {
2984                 temp = fg;
2985                 fg = bg;
2986                 bg = temp;
2987         }
2988
2989         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
2990                 fg = bg;
2991
2992         /* Intelligent cleaning up of the borders. */
2993         if(x == 0) {
2994                 xclear(0, (y == 0)? 0 : winy, borderpx,
2995                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
2996         }
2997         if(x + charlen >= term.col) {
2998                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
2999                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3000         }
3001         if(y == 0)
3002                 xclear(winx, 0, winx + width, borderpx);
3003         if(y == term.row-1)
3004                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3005
3006         /* Clean up the region we want to draw to. */
3007         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3008
3009         /* Set the clip region because Xft is sometimes dirty. */
3010         r.x = 0;
3011         r.y = 0;
3012         r.height = xw.ch;
3013         r.width = width;
3014         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3015
3016         for(xp = winx; bytelen > 0;) {
3017                 /*
3018                  * Search for the range in the to be printed string of glyphs
3019                  * that are in the main font. Then print that range. If
3020                  * some glyph is found that is not in the font, do the
3021                  * fallback dance.
3022                  */
3023                 u8fs = s;
3024                 u8fblen = 0;
3025                 u8fl = 0;
3026                 for(;;) {
3027                         u8c = s;
3028                         u8cblen = utf8decode(s, &u8char);
3029                         s += u8cblen;
3030                         bytelen -= u8cblen;
3031
3032                         doesexist = XftCharIndex(xw.dpy, font->match, u8char);
3033                         if(!doesexist || bytelen <= 0) {
3034                                 if(bytelen <= 0) {
3035                                         if(doesexist) {
3036                                                 u8fl++;
3037                                                 u8fblen += u8cblen;
3038                                         }
3039                                 }
3040
3041                                 if(u8fl > 0) {
3042                                         XftDrawStringUtf8(xw.draw, fg,
3043                                                         font->match, xp,
3044                                                         winy + font->ascent,
3045                                                         (FcChar8 *)u8fs,
3046                                                         u8fblen);
3047                                         xp += font->width * u8fl;
3048
3049                                 }
3050                                 break;
3051                         }
3052
3053                         u8fl++;
3054                         u8fblen += u8cblen;
3055                 }
3056                 if(doesexist)
3057                         break;
3058
3059                 frp = frccur;
3060                 /* Search the font cache. */
3061                 for(i = 0; i < frclen; i++, frp--) {
3062                         if(frp <= 0)
3063                                 frp = LEN(frc) - 1;
3064
3065                         if(frc[frp].c == u8char
3066                                         && frc[frp].flags == frcflags) {
3067                                 break;
3068                         }
3069                 }
3070
3071                 /* Nothing was found. */
3072                 if(i >= frclen) {
3073                         if(!font->set)
3074                                 xloadfontset(font);
3075                         fcsets[0] = font->set;
3076
3077                         /*
3078                          * Nothing was found in the cache. Now use
3079                          * some dozen of Fontconfig calls to get the
3080                          * font for one single character.
3081                          */
3082                         fcpattern = FcPatternDuplicate(font->pattern);
3083                         fccharset = FcCharSetCreate();
3084
3085                         FcCharSetAddChar(fccharset, u8char);
3086                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3087                                         fccharset);
3088                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3089                                         FcTrue);
3090
3091                         FcConfigSubstitute(0, fcpattern,
3092                                         FcMatchPattern);
3093                         FcDefaultSubstitute(fcpattern);
3094
3095                         fontpattern = FcFontSetMatch(0, fcsets,
3096                                         FcTrue, fcpattern, &fcres);
3097
3098                         /*
3099                          * Overwrite or create the new cache entry.
3100                          */
3101                         frccur++;
3102                         frclen++;
3103                         if(frccur >= LEN(frc))
3104                                 frccur = 0;
3105                         if(frclen > LEN(frc)) {
3106                                 frclen = LEN(frc);
3107                                 XftFontClose(xw.dpy, frc[frccur].font);
3108                         }
3109
3110                         frc[frccur].font = XftFontOpenPattern(xw.dpy,
3111                                         fontpattern);
3112                         frc[frccur].c = u8char;
3113                         frc[frccur].flags = frcflags;
3114
3115                         FcPatternDestroy(fcpattern);
3116                         FcCharSetDestroy(fccharset);
3117
3118                         frp = frccur;
3119                 }
3120
3121                 XftDrawStringUtf8(xw.draw, fg, frc[frp].font,
3122                                 xp, winy + frc[frp].font->ascent,
3123                                 (FcChar8 *)u8c, u8cblen);
3124
3125                 xp += font->width;
3126         }
3127
3128         /*
3129         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3130                         winy + font->ascent, (FcChar8 *)s, bytelen);
3131         */
3132
3133         if(base.mode & ATTR_UNDERLINE) {
3134                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3135                                 width, 1);
3136         }
3137
3138         /* Reset clip to none. */
3139         XftDrawSetClip(xw.draw, 0);
3140 }
3141
3142 void
3143 xdrawcursor(void) {
3144         static int oldx = 0, oldy = 0;
3145         int sl;
3146         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3147
3148         LIMIT(oldx, 0, term.col-1);
3149         LIMIT(oldy, 0, term.row-1);
3150
3151         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3152
3153         /* remove the old cursor */
3154         sl = utf8size(term.line[oldy][oldx].c);
3155         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3156                         oldy, 1, sl);
3157
3158         /* draw the new one */
3159         if(!(IS_SET(MODE_HIDE))) {
3160                 if(xw.state & WIN_FOCUSED) {
3161                         if(IS_SET(MODE_REVERSE)) {
3162                                 g.mode |= ATTR_REVERSE;
3163                                 g.fg = defaultcs;
3164                                 g.bg = defaultfg;
3165                         }
3166
3167                         sl = utf8size(g.c);
3168                         xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
3169                 } else {
3170                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3171                                         borderpx + term.c.x * xw.cw,
3172                                         borderpx + term.c.y * xw.ch,
3173                                         xw.cw - 1, 1);
3174                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3175                                         borderpx + term.c.x * xw.cw,
3176                                         borderpx + term.c.y * xw.ch,
3177                                         1, xw.ch - 1);
3178                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3179                                         borderpx + (term.c.x + 1) * xw.cw - 1,
3180                                         borderpx + term.c.y * xw.ch,
3181                                         1, xw.ch - 1);
3182                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3183                                         borderpx + term.c.x * xw.cw,
3184                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3185                                         xw.cw, 1);
3186                 }
3187                 oldx = term.c.x, oldy = term.c.y;
3188         }
3189 }
3190
3191
3192 void
3193 xsettitle(char *p) {
3194         XTextProperty prop;
3195
3196         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3197                         &prop);
3198         XSetWMName(xw.dpy, xw.win, &prop);
3199 }
3200
3201 void
3202 xresettitle(void) {
3203         xsettitle(opt_title ? opt_title : "st");
3204 }
3205
3206 void
3207 redraw(int timeout) {
3208         struct timespec tv = {0, timeout * 1000};
3209
3210         tfulldirt();
3211         draw();
3212
3213         if(timeout > 0) {
3214                 nanosleep(&tv, NULL);
3215                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3216         }
3217 }
3218
3219 void
3220 draw(void) {
3221         drawregion(0, 0, term.col, term.row);
3222         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3223                         xw.h, 0, 0);
3224         XSetForeground(xw.dpy, dc.gc,
3225                         dc.col[IS_SET(MODE_REVERSE)?
3226                                 defaultfg : defaultbg].pixel);
3227 }
3228
3229 void
3230 drawregion(int x1, int y1, int x2, int y2) {
3231         int ic, ib, x, y, ox, sl;
3232         Glyph base, new;
3233         char buf[DRAW_BUF_SIZ];
3234         bool ena_sel = sel.ob.x != -1;
3235
3236         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3237                 ena_sel = 0;
3238
3239         if(!(xw.state & WIN_VISIBLE))
3240                 return;
3241
3242         for(y = y1; y < y2; y++) {
3243                 if(!term.dirty[y])
3244                         continue;
3245
3246                 xtermclear(0, y, term.col, y);
3247                 term.dirty[y] = 0;
3248                 base = term.line[y][0];
3249                 ic = ib = ox = 0;
3250                 for(x = x1; x < x2; x++) {
3251                         new = term.line[y][x];
3252                         if(ena_sel && selected(x, y))
3253                                 new.mode ^= ATTR_REVERSE;
3254                         if(ib > 0 && (ATTRCMP(base, new)
3255                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3256                                 xdraws(buf, base, ox, y, ic, ib);
3257                                 ic = ib = 0;
3258                         }
3259                         if(ib == 0) {
3260                                 ox = x;
3261                                 base = new;
3262                         }
3263
3264                         sl = utf8size(new.c);
3265                         memcpy(buf+ib, new.c, sl);
3266                         ib += sl;
3267                         ++ic;
3268                 }
3269                 if(ib > 0)
3270                         xdraws(buf, base, ox, y, ic, ib);
3271         }
3272         xdrawcursor();
3273 }
3274
3275 void
3276 expose(XEvent *ev) {
3277         XExposeEvent *e = &ev->xexpose;
3278
3279         if(xw.state & WIN_REDRAW) {
3280                 if(!e->count)
3281                         xw.state &= ~WIN_REDRAW;
3282         }
3283         redraw(0);
3284 }
3285
3286 void
3287 visibility(XEvent *ev) {
3288         XVisibilityEvent *e = &ev->xvisibility;
3289
3290         if(e->state == VisibilityFullyObscured) {
3291                 xw.state &= ~WIN_VISIBLE;
3292         } else if(!(xw.state & WIN_VISIBLE)) {
3293                 /* need a full redraw for next Expose, not just a buf copy */
3294                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3295         }
3296 }
3297
3298 void
3299 unmap(XEvent *ev) {
3300         xw.state &= ~WIN_VISIBLE;
3301 }
3302
3303 void
3304 xseturgency(int add) {
3305         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3306
3307         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3308         XSetWMHints(xw.dpy, xw.win, h);
3309         XFree(h);
3310 }
3311
3312 void
3313 focus(XEvent *ev) {
3314         XFocusChangeEvent *e = &ev->xfocus;
3315
3316         if(e->mode == NotifyGrab)
3317                 return;
3318
3319         if(ev->type == FocusIn) {
3320                 XSetICFocus(xw.xic);
3321                 xw.state |= WIN_FOCUSED;
3322                 xseturgency(0);
3323                 if(IS_SET(MODE_FOCUS))
3324                         ttywrite("\033[I", 3);
3325         } else {
3326                 XUnsetICFocus(xw.xic);
3327                 xw.state &= ~WIN_FOCUSED;
3328                 if(IS_SET(MODE_FOCUS))
3329                         ttywrite("\033[O", 3);
3330         }
3331 }
3332
3333 inline bool
3334 match(uint mask, uint state) {
3335         state &= ~(ignoremod);
3336
3337         if(mask == XK_NO_MOD && state)
3338                 return false;
3339         if(mask != XK_ANY_MOD && mask != XK_NO_MOD && !state)
3340                 return false;
3341         if((state & mask) != state)
3342                 return false;
3343         return true;
3344 }
3345
3346 void
3347 numlock(const Arg *dummy) {
3348         term.numlock ^= 1;
3349 }
3350
3351 char*
3352 kmap(KeySym k, uint state) {
3353         uint mask;
3354         Key *kp;
3355         int i;
3356
3357         /* Check for mapped keys out of X11 function keys. */
3358         for(i = 0; i < LEN(mappedkeys); i++) {
3359                 if(mappedkeys[i] == k)
3360                         break;
3361         }
3362         if(i == LEN(mappedkeys)) {
3363                 if((k & 0xFFFF) < 0xFD00)
3364                         return NULL;
3365         }
3366
3367         for(kp = key; kp < key + LEN(key); kp++) {
3368                 mask = kp->mask;
3369
3370                 if(kp->k != k)
3371                         continue;
3372
3373                 if(!match(mask, state))
3374                         continue;
3375
3376                 if(kp->appkey > 0) {
3377                         if(!IS_SET(MODE_APPKEYPAD))
3378                                 continue;
3379                         if(term.numlock && kp->appkey == 2)
3380                                 continue;
3381                 } else if(kp->appkey < 0 && IS_SET(MODE_APPKEYPAD)) {
3382                         continue;
3383                 }
3384
3385                 if((kp->appcursor < 0 && IS_SET(MODE_APPCURSOR)) ||
3386                                 (kp->appcursor > 0
3387                                  && !IS_SET(MODE_APPCURSOR))) {
3388                         continue;
3389                 }
3390
3391                 if((kp->crlf < 0 && IS_SET(MODE_CRLF)) ||
3392                                 (kp->crlf > 0 && !IS_SET(MODE_CRLF))) {
3393                         continue;
3394                 }
3395
3396                 return kp->s;
3397         }
3398
3399         return NULL;
3400 }
3401
3402 void
3403 kpress(XEvent *ev) {
3404         XKeyEvent *e = &ev->xkey;
3405         KeySym ksym;
3406         char xstr[31], buf[32], *customkey, *cp = buf;
3407         int len, ret;
3408         long c;
3409         Status status;
3410         Shortcut *bp;
3411
3412         if(IS_SET(MODE_KBDLOCK))
3413                 return;
3414
3415         len = XmbLookupString(xw.xic, e, xstr, sizeof(xstr), &ksym, &status);
3416         e->state &= ~Mod2Mask;
3417         /* 1. shortcuts */
3418         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3419                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3420                         bp->func(&(bp->arg));
3421                         return;
3422                 }
3423         }
3424
3425         /* 2. custom keys from config.h */
3426         if((customkey = kmap(ksym, e->state))) {
3427                 len = strlen(customkey);
3428                 memcpy(buf, customkey, len);
3429         /* 3. hardcoded (overrides X lookup) */
3430         } else {
3431                 if(len == 0)
3432                         return;
3433
3434                 if(len == 1 && e->state & Mod1Mask) {
3435                         if(IS_SET(MODE_8BIT)) {
3436                                 if(*xstr < 0177) {
3437                                         c = *xstr | B7;
3438                                         ret = utf8encode(&c, cp);
3439                                         cp += ret;
3440                                         len = 0;
3441                                 }
3442                         } else {
3443                                 *cp++ = '\033';
3444                         }
3445                 }
3446
3447                 memcpy(cp, xstr, len);
3448                 len = cp - buf + len;
3449         }
3450
3451         ttywrite(buf, len);
3452         if(IS_SET(MODE_ECHO))
3453                 techo(buf, len);
3454 }
3455
3456
3457 void
3458 cmessage(XEvent *e) {
3459         /*
3460          * See xembed specs
3461          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3462          */
3463         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3464                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3465                         xw.state |= WIN_FOCUSED;
3466                         xseturgency(0);
3467                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3468                         xw.state &= ~WIN_FOCUSED;
3469                 }
3470         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3471                 /* Send SIGHUP to shell */
3472                 kill(pid, SIGHUP);
3473                 exit(EXIT_SUCCESS);
3474         }
3475 }
3476
3477 void
3478 cresize(int width, int height) {
3479         int col, row;
3480
3481         if(width != 0)
3482                 xw.w = width;
3483         if(height != 0)
3484                 xw.h = height;
3485
3486         col = (xw.w - 2 * borderpx) / xw.cw;
3487         row = (xw.h - 2 * borderpx) / xw.ch;
3488
3489         tresize(col, row);
3490         xresize(col, row);
3491         ttyresize();
3492 }
3493
3494 void
3495 resize(XEvent *e) {
3496         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3497                 return;
3498
3499         cresize(e->xconfigure.width, e->xconfigure.height);
3500 }
3501
3502 void
3503 run(void) {
3504         XEvent ev;
3505         fd_set rfd;
3506         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3507         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3508
3509         gettimeofday(&lastblink, NULL);
3510         gettimeofday(&last, NULL);
3511
3512         for(xev = actionfps;;) {
3513                 FD_ZERO(&rfd);
3514                 FD_SET(cmdfd, &rfd);
3515                 FD_SET(xfd, &rfd);
3516
3517                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3518                         if(errno == EINTR)
3519                                 continue;
3520                         die("select failed: %s\n", SERRNO);
3521                 }
3522                 if(FD_ISSET(cmdfd, &rfd)) {
3523                         ttyread();
3524                         if(blinktimeout) {
3525                                 blinkset = tattrset(ATTR_BLINK);
3526                                 if(!blinkset && term.mode & ATTR_BLINK)
3527                                         term.mode &= ~(MODE_BLINK);
3528                         }
3529                 }
3530
3531                 if(FD_ISSET(xfd, &rfd))
3532                         xev = actionfps;
3533
3534                 gettimeofday(&now, NULL);
3535                 drawtimeout.tv_sec = 0;
3536                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3537                 tv = &drawtimeout;
3538
3539                 dodraw = 0;
3540                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3541                         tsetdirtattr(ATTR_BLINK);
3542                         term.mode ^= MODE_BLINK;
3543                         gettimeofday(&lastblink, NULL);
3544                         dodraw = 1;
3545                 }
3546                 if(TIMEDIFF(now, last) \
3547                                 > (xev? (1000/xfps) : (1000/actionfps))) {
3548                         dodraw = 1;
3549                         last = now;
3550                 }
3551
3552                 if(dodraw) {
3553                         while(XPending(xw.dpy)) {
3554                                 XNextEvent(xw.dpy, &ev);
3555                                 if(XFilterEvent(&ev, None))
3556                                         continue;
3557                                 if(handler[ev.type])
3558                                         (handler[ev.type])(&ev);
3559                         }
3560
3561                         draw();
3562                         XFlush(xw.dpy);
3563
3564                         if(xev && !FD_ISSET(xfd, &rfd))
3565                                 xev--;
3566                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3567                                 if(blinkset) {
3568                                         if(TIMEDIFF(now, lastblink) \
3569                                                         > blinktimeout) {
3570                                                 drawtimeout.tv_usec = 1;
3571                                         } else {
3572                                                 drawtimeout.tv_usec = (1000 * \
3573                                                         (blinktimeout - \
3574                                                         TIMEDIFF(now,
3575                                                                 lastblink)));
3576                                         }
3577                                 } else {
3578                                         tv = NULL;
3579                                 }
3580                         }
3581                 }
3582         }
3583 }
3584
3585 void
3586 usage(void) {
3587         die("%s " VERSION " (c) 2010-2013 st engineers\n" \
3588         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3589         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3590 }
3591
3592 int
3593 main(int argc, char *argv[]) {
3594         int bitm, xr, yr;
3595         uint wr, hr;
3596
3597         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3598         xw.isfixed = False;
3599
3600         ARGBEGIN {
3601         case 'a':
3602                 allowaltscreen = false;
3603                 break;
3604         case 'c':
3605                 opt_class = EARGF(usage());
3606                 break;
3607         case 'e':
3608                 /* eat all remaining arguments */
3609                 if(argc > 1)
3610                         opt_cmd = &argv[1];
3611                 goto run;
3612         case 'f':
3613                 opt_font = EARGF(usage());
3614                 break;
3615         case 'g':
3616                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3617                 if(bitm & XValue)
3618                         xw.fx = xr;
3619                 if(bitm & YValue)
3620                         xw.fy = yr;
3621                 if(bitm & WidthValue)
3622                         xw.fw = (int)wr;
3623                 if(bitm & HeightValue)
3624                         xw.fh = (int)hr;
3625                 if(bitm & XNegative && xw.fx == 0)
3626                         xw.fx = -1;
3627                 if(bitm & XNegative && xw.fy == 0)
3628                         xw.fy = -1;
3629
3630                 if(xw.fh != 0 && xw.fw != 0)
3631                         xw.isfixed = True;
3632                 break;
3633         case 'o':
3634                 opt_io = EARGF(usage());
3635                 break;
3636         case 't':
3637                 opt_title = EARGF(usage());
3638                 break;
3639         case 'w':
3640                 opt_embed = EARGF(usage());
3641                 break;
3642         case 'v':
3643         default:
3644                 usage();
3645         } ARGEND;
3646
3647 run:
3648         setlocale(LC_CTYPE, "");
3649         XSetLocaleModifiers("");
3650         tnew(80, 24);
3651         xinit();
3652         ttynew();
3653         selinit();
3654         if(xw.isfixed)
3655                 cresize(xw.h, xw.w);
3656         run();
3657
3658         return 0;
3659 }
3660