st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <pwd.h>
   9 #include <stdarg.h>
  10 #include <stdbool.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <signal.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <X11/Xatom.h>
  24 #include <X11/Xlib.h>
  25 #include <X11/Xutil.h>
  26 #include <X11/cursorfont.h>
  27 #include <X11/keysym.h>
  28 #include <X11/extensions/Xdbe.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31
  32 #define Glyph Glyph_
  33 #define Font Font_
  34 #define Draw XftDraw *
  35 #define Colour XftColor
  36 #define Colourmap Colormap
  37
  38 #if   defined(__linux)
  39  #include <pty.h>
  40 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  41  #include <util.h>
  42 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  43  #include <libutil.h>
  44 #endif
  45
  46 #define USAGE \
  47         "st " VERSION " (c) 2010-2013 st engineers\n" \
  48         "usage: st [-v] [-c class] [-f font] [-g geometry] [-o file]" \
  49         " [-t title] [-w windowid] [-e command ...]\n"
  50
  51 /* XEMBED messages */
  52 #define XEMBED_FOCUS_IN  4
  53 #define XEMBED_FOCUS_OUT 5
  54
  55 /* Arbitrary sizes */
  56 #define UTF_SIZ       4
  57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  58 #define ESC_ARG_SIZ   16
  59 #define STR_BUF_SIZ   ESC_BUF_SIZ
  60 #define STR_ARG_SIZ   ESC_ARG_SIZ
  61 #define DRAW_BUF_SIZ  20*1024
  62 #define XK_ANY_MOD    UINT_MAX
  63 #define XK_NO_MOD     0
  64
  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 };
  90
  91 enum cursor_movement {
  92         CURSOR_SAVE,
  93         CURSOR_LOAD
  94 };
  95
  96 enum cursor_state {
  97         CURSOR_DEFAULT  = 0,
  98         CURSOR_WRAPNEXT = 1,
  99         CURSOR_ORIGIN   = 2
 100 };
 101
 102 enum glyph_state {
 103         GLYPH_SET   = 1,
 104         GLYPH_DIRTY = 2
 105 };
 106
 107 enum term_mode {
 108         MODE_WRAP        = 1,
 109         MODE_INSERT      = 2,
 110         MODE_APPKEYPAD   = 4,
 111         MODE_ALTSCREEN   = 8,
 112         MODE_CRLF        = 16,
 113         MODE_MOUSEBTN    = 32,
 114         MODE_MOUSEMOTION = 64,
 115         MODE_MOUSE       = 32|64,
 116         MODE_REVERSE     = 128,
 117         MODE_KBDLOCK     = 256,
 118         MODE_HIDE        = 512,
 119         MODE_ECHO        = 1024,
 120         MODE_APPCURSOR   = 2048,
 121         MODE_MOUSESGR    = 4096,
 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 /* bit macro */
 140 #undef B0
 141 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 142
 143 typedef unsigned char uchar;
 144 typedef unsigned int uint;
 145 typedef unsigned long ulong;
 146 typedef unsigned short ushort;
 147
 148 typedef struct {
 149         char c[UTF_SIZ];     /* character code */
 150         uchar mode;  /* attribute flags */
 151         ushort fg;   /* foreground  */
 152         ushort bg;   /* background  */
 153         uchar state; /* state flags    */
 154 } Glyph;
 155
 156 typedef Glyph *Line;
 157
 158 typedef struct {
 159         Glyph attr;      /* current char attributes */
 160         int x;
 161         int y;
 162         char state;
 163 } TCursor;
 164
 165 /* CSI Escape sequence structs */
 166 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 167 typedef struct {
 168         char buf[ESC_BUF_SIZ]; /* raw string */
 169         int len;               /* raw string length */
 170         char priv;
 171         int arg[ESC_ARG_SIZ];
 172         int narg;              /* nb of args */
 173         char mode;
 174 } CSIEscape;
 175
 176 /* STR Escape sequence structs */
 177 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 178 typedef struct {
 179         char type;           /* ESC type ... */
 180         char buf[STR_BUF_SIZ]; /* raw string */
 181         int len;               /* raw string length */
 182         char *args[STR_ARG_SIZ];
 183         int narg;             /* nb of args */
 184 } STREscape;
 185
 186 /* Internal representation of the screen */
 187 typedef struct {
 188         int row;        /* nb row */
 189         int col;        /* nb col */
 190         Line *line;     /* screen */
 191         Line *alt;      /* alternate screen */
 192         bool *dirty;    /* dirtyness of lines */
 193         TCursor c;      /* cursor */
 194         int top;        /* top    scroll limit */
 195         int bot;        /* bottom scroll limit */
 196         int mode;       /* terminal mode flags */
 197         int esc;        /* escape state flags */
 198         bool numlock;   /* lock numbers in keyboard */
 199         bool *tabs;
 200 } Term;
 201
 202 /* Purely graphic info */
 203 typedef struct {
 204         Display *dpy;
 205         Colourmap cmap;
 206         Window win;
 207         Drawable buf;
 208         Atom xembed, wmdeletewin;
 209         XIM xim;
 210         XIC xic;
 211         Draw draw;
 212         Visual *vis;
 213         int scr;
 214         bool isfixed; /* is fixed geometry? */
 215         int fx, fy, fw, fh; /* fixed geometry */
 216         int tw, th; /* tty width and height */
 217         int w, h; /* window width and height */
 218         int ch; /* char height */
 219         int cw; /* char width  */
 220         char state; /* focus, redraw, visible */
 221 } XWindow;
 222
 223 typedef struct {
 224         KeySym k;
 225         uint mask;
 226         char s[ESC_BUF_SIZ];
 227         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 228         signed char appkey;             /* application keypad */
 229         signed char appcursor;          /* application cursor */
 230         signed char crlf;               /* crlf mode          */
 231 } Key;
 232
 233 /* TODO: use better name for vars... */
 234 typedef struct {
 235         int mode;
 236         int bx, by;
 237         int ex, ey;
 238         struct {
 239                 int x, y;
 240         } b, e;
 241         char *clip;
 242         Atom xtarget;
 243         bool alt;
 244         struct timeval tclick1;
 245         struct timeval tclick2;
 246 } Selection;
 247
 248 typedef union {
 249         int i;
 250         unsigned int ui;
 251         float f;
 252         const void *v;
 253 } Arg;
 254
 255 typedef struct {
 256         unsigned int mod;
 257         KeySym keysym;
 258         void (*func)(const Arg *);
 259         const Arg arg;
 260 } Shortcut;
 261
 262 /* function definitions used in config.h */
 263 static void xzoom(const Arg *);
 264 static void selpaste(const Arg *);
 265 static void numlock(const Arg *);
 266
 267 /* Config.h for applying patches and the configuration. */
 268 #include "config.h"
 269
 270 /* Font structure */
 271 typedef struct {
 272         int height;
 273         int width;
 274         int ascent;
 275         int descent;
 276         short lbearing;
 277         short rbearing;
 278         XftFont *match;
 279         FcFontSet *set;
 280         FcPattern *pattern;
 281 } Font;
 282
 283 /* Drawing Context */
 284 typedef struct {
 285         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 286         Font font, bfont, ifont, ibfont;
 287         GC gc;
 288 } DC;
 289
 290 static void die(const char *, ...);
 291 static void draw(void);
 292 static void redraw(int);
 293 static void drawregion(int, int, int, int);
 294 static void execsh(void);
 295 static void sigchld(int);
 296 static void run(void);
 297
 298 static void csidump(void);
 299 static void csihandle(void);
 300 static void csiparse(void);
 301 static void csireset(void);
 302 static void strdump(void);
 303 static void strhandle(void);
 304 static void strparse(void);
 305 static void strreset(void);
 306
 307 static void tclearregion(int, int, int, int, int);
 308 static void tcursor(int);
 309 static void tdeletechar(int);
 310 static void tdeleteline(int);
 311 static void tinsertblank(int);
 312 static void tinsertblankline(int);
 313 static void tmoveto(int, int);
 314 static void tmoveato(int x, int y);
 315 static void tnew(int, int);
 316 static void tnewline(int);
 317 static void tputtab(bool);
 318 static void tputc(char *, int);
 319 static void treset(void);
 320 static int tresize(int, int);
 321 static void tscrollup(int, int);
 322 static void tscrolldown(int, int);
 323 static void tsetattr(int*, int);
 324 static void tsetchar(char *, Glyph *, int, int);
 325 static void tsetscroll(int, int);
 326 static void tswapscreen(void);
 327 static void tsetdirt(int, int);
 328 static void tsetmode(bool, bool, int *, int);
 329 static void tfulldirt(void);
 330 static void techo(char *, int);
 331
 332 static inline bool match(uint, uint);
 333 static void ttynew(void);
 334 static void ttyread(void);
 335 static void ttyresize(void);
 336 static void ttywrite(const char *, size_t);
 337
 338 static void xdraws(char *, Glyph, int, int, int, int);
 339 static void xhints(void);
 340 static void xclear(int, int, int, int);
 341 static void xdrawcursor(void);
 342 static void xinit(void);
 343 static void xloadcols(void);
 344 static int xloadfont(Font *, FcPattern *);
 345 static void xloadfonts(char *, int);
 346 static void xresettitle(void);
 347 static void xseturgency(int);
 348 static void xsetsel(char*);
 349 static void xtermclear(int, int, int, int);
 350 static void xunloadfonts(void);
 351 static void xresize(int, int);
 352
 353 static void expose(XEvent *);
 354 static void visibility(XEvent *);
 355 static void unmap(XEvent *);
 356 static char *kmap(KeySym, uint);
 357 static void kpress(XEvent *);
 358 static void cmessage(XEvent *);
 359 static void cresize(int, int);
 360 static void resize(XEvent *);
 361 static void focus(XEvent *);
 362 static void brelease(XEvent *);
 363 static void bpress(XEvent *);
 364 static void bmotion(XEvent *);
 365 static void selnotify(XEvent *);
 366 static void selclear(XEvent *);
 367 static void selrequest(XEvent *);
 368
 369 static void selinit(void);
 370 static inline bool selected(int, int);
 371 static void selcopy(void);
 372 static void selscroll(int, int);
 373
 374 static int utf8decode(char *, long *);
 375 static int utf8encode(long *, char *);
 376 static int utf8size(char *);
 377 static int isfullutf8(char *, int);
 378
 379 static ssize_t xwrite(int, char *, size_t);
 380 static void *xmalloc(size_t);
 381 static void *xrealloc(void *, size_t);
 382 static void *xcalloc(size_t, size_t);
 383
 384 static void (*handler[LASTEvent])(XEvent *) = {
 385         [KeyPress] = kpress,
 386         [ClientMessage] = cmessage,
 387         [ConfigureNotify] = resize,
 388         [VisibilityNotify] = visibility,
 389         [UnmapNotify] = unmap,
 390         [Expose] = expose,
 391         [FocusIn] = focus,
 392         [FocusOut] = focus,
 393         [MotionNotify] = bmotion,
 394         [ButtonPress] = bpress,
 395         [ButtonRelease] = brelease,
 396         [SelectionClear] = selclear,
 397         [SelectionNotify] = selnotify,
 398         [SelectionRequest] = selrequest,
 399 };
 400
 401 /* Globals */
 402 static DC dc;
 403 static XWindow xw;
 404 static Term term;
 405 static CSIEscape csiescseq;
 406 static STREscape strescseq;
 407 static int cmdfd;
 408 static pid_t pid;
 409 static Selection sel;
 410 static int iofd = -1;
 411 static char **opt_cmd = NULL;
 412 static char *opt_io = NULL;
 413 static char *opt_title = NULL;
 414 static char *opt_embed = NULL;
 415 static char *opt_class = NULL;
 416 static char *opt_font = NULL;
 417
 418 bool usedbe = False;
 419
 420 static char *usedfont = NULL;
 421 static int usedfontsize = 0;
 422
 423 /* Font Ring Cache */
 424 enum {
 425         FRC_NORMAL,
 426         FRC_ITALIC,
 427         FRC_BOLD,
 428         FRC_ITALICBOLD
 429 };
 430
 431 typedef struct {
 432         XftFont *font;
 433         long c;
 434         int flags;
 435 } Fontcache;
 436
 437 /*
 438  * Fontcache is a ring buffer, with frccur as current position and frclen as
 439  * the current length of used elements.
 440  */
 441
 442 static Fontcache frc[1024];
 443 static int frccur = -1, frclen = 0;
 444
 445 ssize_t
 446 xwrite(int fd, char *s, size_t len) {
 447         size_t aux = len;
 448
 449         while(len > 0) {
 450                 ssize_t r = write(fd, s, len);
 451                 if(r < 0)
 452                         return r;
 453                 len -= r;
 454                 s += r;
 455         }
 456         return aux;
 457 }
 458
 459 void *
 460 xmalloc(size_t len) {
 461         void *p = malloc(len);
 462
 463         if(!p)
 464                 die("Out of memory\n");
 465
 466         return p;
 467 }
 468
 469 void *
 470 xrealloc(void *p, size_t len) {
 471         if((p = realloc(p, len)) == NULL)
 472                 die("Out of memory\n");
 473
 474         return p;
 475 }
 476
 477 void *
 478 xcalloc(size_t nmemb, size_t size) {
 479         void *p = calloc(nmemb, size);
 480
 481         if(!p)
 482                 die("Out of memory\n");
 483
 484         return p;
 485 }
 486
 487 int
 488 utf8decode(char *s, long *u) {
 489         uchar c;
 490         int i, n, rtn;
 491
 492         rtn = 1;
 493         c = *s;
 494         if(~c & B7) { /* 0xxxxxxx */
 495                 *u = c;
 496                 return rtn;
 497         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 498                 *u = c&(B4|B3|B2|B1|B0);
 499                 n = 1;
 500         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 501                 *u = c&(B3|B2|B1|B0);
 502                 n = 2;
 503         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 504                 *u = c & (B2|B1|B0);
 505                 n = 3;
 506         } else {
 507                 goto invalid;
 508         }
 509
 510         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 511                 c = *s;
 512                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 513                         goto invalid;
 514                 *u <<= 6;
 515                 *u |= c & (B5|B4|B3|B2|B1|B0);
 516         }
 517
 518         if((n == 1 && *u < 0x80) ||
 519            (n == 2 && *u < 0x800) ||
 520            (n == 3 && *u < 0x10000) ||
 521            (*u >= 0xD800 && *u <= 0xDFFF)) {
 522                 goto invalid;
 523         }
 524
 525         return rtn;
 526 invalid:
 527         *u = 0xFFFD;
 528
 529         return rtn;
 530 }
 531
 532 int
 533 utf8encode(long *u, char *s) {
 534         uchar *sp;
 535         ulong uc;
 536         int i, n;
 537
 538         sp = (uchar *)s;
 539         uc = *u;
 540         if(uc < 0x80) {
 541                 *sp = uc; /* 0xxxxxxx */
 542                 return 1;
 543         } else if(*u < 0x800) {
 544                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 545                 n = 1;
 546         } else if(uc < 0x10000) {
 547                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 548                 n = 2;
 549         } else if(uc <= 0x10FFFF) {
 550                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 551                 n = 3;
 552         } else {
 553                 goto invalid;
 554         }
 555
 556         for(i=n,++sp; i>0; --i,++sp)
 557                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 558
 559         return n+1;
 560 invalid:
 561         /* U+FFFD */
 562         *s++ = '\xEF';
 563         *s++ = '\xBF';
 564         *s = '\xBD';
 565
 566         return 3;
 567 }
 568
 569 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 570    UTF-8 otherwise return 0 */
 571 int
 572 isfullutf8(char *s, int b) {
 573         uchar *c1, *c2, *c3;
 574
 575         c1 = (uchar *)s;
 576         c2 = (uchar *)++s;
 577         c3 = (uchar *)++s;
 578         if(b < 1) {
 579                 return 0;
 580         } else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1) {
 581                 return 0;
 582         } else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 583             ((b == 1) ||
 584             ((b == 2) && (*c2&(B7|B6)) == B7))) {
 585                 return 0;
 586         } else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 587             ((b == 1) ||
 588             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 589             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7))) {
 590                 return 0;
 591         } else {
 592                 return 1;
 593         }
 594 }
 595
 596 int
 597 utf8size(char *s) {
 598         uchar c = *s;
 599
 600         if(~c&B7) {
 601                 return 1;
 602         } else if((c&(B7|B6|B5)) == (B7|B6)) {
 603                 return 2;
 604         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) {
 605                 return 3;
 606         } else {
 607                 return 4;
 608         }
 609 }
 610
 611 void
 612 selinit(void) {
 613         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 614         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 615         sel.mode = 0;
 616         sel.bx = -1;
 617         sel.clip = NULL;
 618         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 619         if(sel.xtarget == None)
 620                 sel.xtarget = XA_STRING;
 621 }
 622
 623 static int
 624 x2col(int x) {
 625         x -= borderpx;
 626         x /= xw.cw;
 627
 628         return LIMIT(x, 0, term.col-1);
 629 }
 630
 631 static int
 632 y2row(int y) {
 633         y -= borderpx;
 634         y /= xw.ch;
 635
 636         return LIMIT(y, 0, term.row-1);
 637 }
 638
 639 static inline bool
 640 selected(int x, int y) {
 641         int bx, ex;
 642
 643         if(sel.ey == y && sel.by == y) {
 644                 bx = MIN(sel.bx, sel.ex);
 645                 ex = MAX(sel.bx, sel.ex);
 646                 return BETWEEN(x, bx, ex);
 647         }
 648
 649         return ((sel.b.y < y && y < sel.e.y)
 650                         || (y == sel.e.y && x <= sel.e.x))
 651                         || (y == sel.b.y && x >= sel.b.x
 652                                 && (x <= sel.e.x || sel.b.y != sel.e.y));
 653 }
 654
 655 void
 656 getbuttoninfo(XEvent *e) {
 657         sel.alt = IS_SET(MODE_ALTSCREEN);
 658
 659         sel.ex = x2col(e->xbutton.x);
 660         sel.ey = y2row(e->xbutton.y);
 661
 662         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 663         sel.b.y = MIN(sel.by, sel.ey);
 664         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 665         sel.e.y = MAX(sel.by, sel.ey);
 666 }
 667
 668 void
 669 mousereport(XEvent *e) {
 670         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 671             button = e->xbutton.button, state = e->xbutton.state,
 672             len;
 673         char buf[40];
 674         static int ob, ox, oy;
 675
 676         /* from urxvt */
 677         if(e->xbutton.type == MotionNotify) {
 678                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 679                         return;
 680                 button = ob + 32;
 681                 ox = x, oy = y;
 682         } else if(!IS_SET(MODE_MOUSESGR)
 683                         && (e->xbutton.type == ButtonRelease
 684                                 || button == AnyButton)) {
 685                 button = 3;
 686         } else {
 687                 button -= Button1;
 688                 if(button >= 3)
 689                         button += 64 - 3;
 690                 if(e->xbutton.type == ButtonPress) {
 691                         ob = button;
 692                         ox = x, oy = y;
 693                 }
 694         }
 695
 696         button += (state & ShiftMask   ? 4  : 0)
 697                 + (state & Mod4Mask    ? 8  : 0)
 698                 + (state & ControlMask ? 16 : 0);
 699
 700         len = 0;
 701         if(IS_SET(MODE_MOUSESGR)) {
 702                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 703                                 button, x+1, y+1,
 704                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 705         } else if(x < 223 && y < 223) {
 706                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 707                                 32+button, 32+x+1, 32+y+1);
 708         } else {
 709                 return;
 710         }
 711
 712         ttywrite(buf, len);
 713 }
 714
 715 void
 716 bpress(XEvent *e) {
 717         if(IS_SET(MODE_MOUSE)) {
 718                 mousereport(e);
 719         } else if(e->xbutton.button == Button1) {
 720                 if(sel.bx != -1) {
 721                         sel.bx = -1;
 722                         tsetdirt(sel.b.y, sel.e.y);
 723                         draw();
 724                 }
 725                 sel.mode = 1;
 726                 sel.ex = sel.bx = x2col(e->xbutton.x);
 727                 sel.ey = sel.by = y2row(e->xbutton.y);
 728         } else if(e->xbutton.button == Button4) {
 729                 ttywrite("\031", 1);
 730         } else if(e->xbutton.button == Button5) {
 731                 ttywrite("\005", 1);
 732         }
 733 }
 734
 735 void
 736 selcopy(void) {
 737         char *str, *ptr, *p;
 738         int x, y, bufsize, is_selected = 0, size;
 739         Glyph *gp, *last;
 740
 741         if(sel.bx == -1) {
 742                 str = NULL;
 743         } else {
 744                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 745                 ptr = str = xmalloc(bufsize);
 746
 747                 /* append every set & selected glyph to the selection */
 748                 for(y = 0; y < term.row; y++) {
 749                         gp = &term.line[y][0];
 750                         last = gp + term.col;
 751
 752                         while(--last >= gp && !(last->state & GLYPH_SET))
 753                                 /* nothing */;
 754
 755                         for(x = 0; gp <= last; x++, ++gp) {
 756                                 if(!(is_selected = selected(x, y)))
 757                                         continue;
 758
 759                                 p = (gp->state & GLYPH_SET) ? gp->c : " ";
 760                                 size = utf8size(p);
 761                                 memcpy(ptr, p, size);
 762                                 ptr += size;
 763                         }
 764                         /* \n at the end of every selected line except for the last one */
 765                         if(is_selected && y < sel.e.y)
 766                                 *ptr++ = '\n';
 767                 }
 768                 *ptr = 0;
 769         }
 770         xsetsel(str);
 771 }
 772
 773 void
 774 selnotify(XEvent *e) {
 775         ulong nitems, ofs, rem;
 776         int format;
 777         uchar *data;
 778         Atom type;
 779
 780         ofs = 0;
 781         do {
 782                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 783                                         False, AnyPropertyType, &type, &format,
 784                                         &nitems, &rem, &data)) {
 785                         fprintf(stderr, "Clipboard allocation failed\n");
 786                         return;
 787                 }
 788                 ttywrite((const char *) data, nitems * format / 8);
 789                 XFree(data);
 790                 /* number of 32-bit chunks returned */
 791                 ofs += nitems * format / 32;
 792         } while(rem > 0);
 793 }
 794
 795 void
 796 selpaste(const Arg *dummy) {
 797         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
 798                         xw.win, CurrentTime);
 799 }
 800
 801 void selclear(XEvent *e) {
 802         if(sel.bx == -1)
 803                 return;
 804         sel.bx = -1;
 805         tsetdirt(sel.b.y, sel.e.y);
 806 }
 807
 808 void
 809 selrequest(XEvent *e) {
 810         fprintf(stderr, "selrequest\n");
 811         XSelectionRequestEvent *xsre;
 812         XSelectionEvent xev;
 813         Atom xa_targets, string;
 814
 815         xsre = (XSelectionRequestEvent *) e;
 816         xev.type = SelectionNotify;
 817         xev.requestor = xsre->requestor;
 818         xev.selection = xsre->selection;
 819         xev.target = xsre->target;
 820         xev.time = xsre->time;
 821         /* reject */
 822         xev.property = None;
 823
 824         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 825         if(xsre->target == xa_targets) {
 826                 /* respond with the supported type */
 827                 string = sel.xtarget;
 828                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 829                                 XA_ATOM, 32, PropModeReplace,
 830                                 (uchar *) &string, 1);
 831                 xev.property = xsre->property;
 832         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 833                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 834                                 xsre->target, 8, PropModeReplace,
 835                                 (uchar *) sel.clip, strlen(sel.clip));
 836                 xev.property = xsre->property;
 837         }
 838
 839         /* all done, send a notification to the listener */
 840         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 841                 fprintf(stderr, "Error sending SelectionNotify event\n");
 842 }
 843
 844 void
 845 xsetsel(char *str) {
 846         fprintf(stderr, "xsetsel: %s\n", str);
 847         /* register the selection for both the clipboard and the primary */
 848         Atom clipboard;
 849
 850         free(sel.clip);
 851         sel.clip = str;
 852
 853         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 854
 855         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 856         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 857 }
 858
 859 void
 860 brelease(XEvent *e) {
 861         struct timeval now;
 862
 863         if(IS_SET(MODE_MOUSE)) {
 864                 mousereport(e);
 865                 return;
 866         }
 867
 868         if(e->xbutton.button == Button2) {
 869                 selpaste(NULL);
 870         } else if(e->xbutton.button == Button1) {
 871                 sel.mode = 0;
 872                 getbuttoninfo(e);
 873                 term.dirty[sel.ey] = 1;
 874                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 875                         sel.bx = -1;
 876                         gettimeofday(&now, NULL);
 877
 878                         if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 879                                 /* triple click on the line */
 880                                 sel.b.x = sel.bx = 0;
 881                                 sel.e.x = sel.ex = term.col;
 882                                 sel.b.y = sel.e.y = sel.ey;
 883                                 selcopy();
 884                         } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 885                                 /* double click to select word */
 886                                 sel.bx = sel.ex;
 887                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 888                                                 term.line[sel.ey][sel.bx-1].c[0] != ' ') {
 889                                         sel.bx--;
 890                                 }
 891                                 sel.b.x = sel.bx;
 892                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 893                                                 term.line[sel.ey][sel.ex+1].c[0] != ' ') {
 894                                         sel.ex++;
 895                                 }
 896                                 sel.e.x = sel.ex;
 897                                 sel.b.y = sel.e.y = sel.ey;
 898                                 selcopy();
 899                         }
 900                 } else {
 901                         selcopy();
 902                 }
 903         }
 904
 905         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 906         gettimeofday(&sel.tclick1, NULL);
 907 }
 908
 909 void
 910 bmotion(XEvent *e) {
 911         int starty, endy, oldey, oldex;
 912
 913         if(IS_SET(MODE_MOUSE)) {
 914                 mousereport(e);
 915                 return;
 916         }
 917
 918         if(!sel.mode)
 919                 return;
 920
 921         oldey = sel.ey;
 922         oldex = sel.ex;
 923         getbuttoninfo(e);
 924
 925         if(oldey != sel.ey || oldex != sel.ex) {
 926                 starty = MIN(oldey, sel.ey);
 927                 endy = MAX(oldey, sel.ey);
 928                 tsetdirt(starty, endy);
 929         }
 930 }
 931
 932 void
 933 die(const char *errstr, ...) {
 934         va_list ap;
 935
 936         va_start(ap, errstr);
 937         vfprintf(stderr, errstr, ap);
 938         va_end(ap);
 939         exit(EXIT_FAILURE);
 940 }
 941
 942 void
 943 execsh(void) {
 944         char **args;
 945         char *envshell = getenv("SHELL");
 946         const struct passwd *pass = getpwuid(getuid());
 947         char buf[sizeof(long) * 8 + 1];
 948
 949         unsetenv("COLUMNS");
 950         unsetenv("LINES");
 951         unsetenv("TERMCAP");
 952
 953         if(pass) {
 954                 setenv("LOGNAME", pass->pw_name, 1);
 955                 setenv("USER", pass->pw_name, 1);
 956                 setenv("SHELL", pass->pw_shell, 0);
 957                 setenv("HOME", pass->pw_dir, 0);
 958         }
 959
 960         snprintf(buf, sizeof(buf), "%lu", xw.win);
 961         setenv("WINDOWID", buf, 1);
 962
 963         signal(SIGCHLD, SIG_DFL);
 964         signal(SIGHUP, SIG_DFL);
 965         signal(SIGINT, SIG_DFL);
 966         signal(SIGQUIT, SIG_DFL);
 967         signal(SIGTERM, SIG_DFL);
 968         signal(SIGALRM, SIG_DFL);
 969
 970         DEFAULT(envshell, shell);
 971         setenv("TERM", termname, 1);
 972         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
 973         execvp(args[0], args);
 974         exit(EXIT_FAILURE);
 975 }
 976
 977 void
 978 sigchld(int a) {
 979         int stat = 0;
 980
 981         if(waitpid(pid, &stat, 0) < 0)
 982                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 983
 984         if(WIFEXITED(stat)) {
 985                 exit(WEXITSTATUS(stat));
 986         } else {
 987                 exit(EXIT_FAILURE);
 988         }
 989 }
 990
 991 void
 992 ttynew(void) {
 993         int m, s;
 994         struct winsize w = {term.row, term.col, 0, 0};
 995
 996         /* seems to work fine on linux, openbsd and freebsd */
 997         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 998                 die("openpty failed: %s\n", SERRNO);
 999
1000         switch(pid = fork()) {
1001         case -1:
1002                 die("fork failed\n");
1003                 break;
1004         case 0:
1005                 setsid(); /* create a new process group */
1006                 dup2(s, STDIN_FILENO);
1007                 dup2(s, STDOUT_FILENO);
1008                 dup2(s, STDERR_FILENO);
1009                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1010                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
1011                 close(s);
1012                 close(m);
1013                 execsh();
1014                 break;
1015         default:
1016                 close(s);
1017                 cmdfd = m;
1018                 signal(SIGCHLD, sigchld);
1019                 if(opt_io) {
1020                         iofd = (!strcmp(opt_io, "-")) ?
1021                                   STDOUT_FILENO :
1022                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1023                         if(iofd < 0) {
1024                                 fprintf(stderr, "Error opening %s:%s\n",
1025                                         opt_io, strerror(errno));
1026                         }
1027                 }
1028         }
1029 }
1030
1031 void
1032 dump(char c) {
1033         static int col;
1034
1035         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1036         if(++col % 10 == 0)
1037                 fprintf(stderr, "\n");
1038 }
1039
1040 void
1041 ttyread(void) {
1042         static char buf[BUFSIZ];
1043         static int buflen = 0;
1044         char *ptr;
1045         char s[UTF_SIZ];
1046         int charsize; /* size of utf8 char in bytes */
1047         long utf8c;
1048         int ret;
1049
1050         /* append read bytes to unprocessed bytes */
1051         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1052                 die("Couldn't read from shell: %s\n", SERRNO);
1053
1054         /* process every complete utf8 char */
1055         buflen += ret;
1056         ptr = buf;
1057         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
1058                 charsize = utf8decode(ptr, &utf8c);
1059                 utf8encode(&utf8c, s);
1060                 tputc(s, charsize);
1061                 ptr += charsize;
1062                 buflen -= charsize;
1063         }
1064
1065         /* keep any uncomplete utf8 char for the next call */
1066         memmove(buf, ptr, buflen);
1067 }
1068
1069 void
1070 ttywrite(const char *s, size_t n) {
1071         if(write(cmdfd, s, n) == -1)
1072                 die("write error on tty: %s\n", SERRNO);
1073 }
1074
1075 void
1076 ttyresize(void) {
1077         struct winsize w;
1078
1079         w.ws_row = term.row;
1080         w.ws_col = term.col;
1081         w.ws_xpixel = xw.tw;
1082         w.ws_ypixel = xw.th;
1083         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1084                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
1085 }
1086
1087 void
1088 tsetdirt(int top, int bot) {
1089         int i;
1090
1091         LIMIT(top, 0, term.row-1);
1092         LIMIT(bot, 0, term.row-1);
1093
1094         for(i = top; i <= bot; i++)
1095                 term.dirty[i] = 1;
1096 }
1097
1098 void
1099 tfulldirt(void) {
1100         tsetdirt(0, term.row-1);
1101 }
1102
1103 void
1104 tcursor(int mode) {
1105         static TCursor c;
1106
1107         if(mode == CURSOR_SAVE) {
1108                 c = term.c;
1109         } else if(mode == CURSOR_LOAD) {
1110                 term.c = c;
1111                 tmoveto(c.x, c.y);
1112         }
1113 }
1114
1115 void
1116 treset(void) {
1117         uint i;
1118
1119         term.c = (TCursor){{
1120                 .mode = ATTR_NULL,
1121                 .fg = defaultfg,
1122                 .bg = defaultbg
1123         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1124
1125         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1126         for(i = tabspaces; i < term.col; i += tabspaces)
1127                 term.tabs[i] = 1;
1128         term.top = 0;
1129         term.bot = term.row - 1;
1130         term.mode = MODE_WRAP;
1131
1132         tclearregion(0, 0, term.col-1, term.row-1, 0);
1133         tmoveto(0, 0);
1134         tcursor(CURSOR_SAVE);
1135 }
1136
1137 void
1138 tnew(int col, int row) {
1139         /* set screen size */
1140         term.row = row;
1141         term.col = col;
1142         term.line = xmalloc(term.row * sizeof(Line));
1143         term.alt  = xmalloc(term.row * sizeof(Line));
1144         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
1145         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
1146
1147         for(row = 0; row < term.row; row++) {
1148                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
1149                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
1150                 term.dirty[row] = 0;
1151         }
1152
1153         term.numlock = 1;
1154         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1155         /* setup screen */
1156         treset();
1157 }
1158
1159 void
1160 tswapscreen(void) {
1161         Line *tmp = term.line;
1162
1163         term.line = term.alt;
1164         term.alt = tmp;
1165         term.mode ^= MODE_ALTSCREEN;
1166         tfulldirt();
1167 }
1168
1169 void
1170 tscrolldown(int orig, int n) {
1171         int i;
1172         Line temp;
1173
1174         LIMIT(n, 0, term.bot-orig+1);
1175
1176         tclearregion(0, term.bot-n+1, term.col-1, term.bot, 0);
1177
1178         for(i = term.bot; i >= orig+n; i--) {
1179                 temp = term.line[i];
1180                 term.line[i] = term.line[i-n];
1181                 term.line[i-n] = temp;
1182
1183                 term.dirty[i] = 1;
1184                 term.dirty[i-n] = 1;
1185         }
1186
1187         selscroll(orig, n);
1188 }
1189
1190 void
1191 tscrollup(int orig, int n) {
1192         int i;
1193         Line temp;
1194         LIMIT(n, 0, term.bot-orig+1);
1195
1196         tclearregion(0, orig, term.col-1, orig+n-1, 0);
1197
1198         for(i = orig; i <= term.bot-n; i++) {
1199                  temp = term.line[i];
1200                  term.line[i] = term.line[i+n];
1201                  term.line[i+n] = temp;
1202
1203                  term.dirty[i] = 1;
1204                  term.dirty[i+n] = 1;
1205         }
1206
1207         selscroll(orig, -n);
1208 }
1209
1210 void
1211 selscroll(int orig, int n) {
1212         if(sel.bx == -1)
1213                 return;
1214
1215         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1216                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1217                         sel.bx = -1;
1218                         return;
1219                 }
1220                 if(sel.by < term.top) {
1221                         sel.by = term.top;
1222                         sel.bx = 0;
1223                 }
1224                 if(sel.ey > term.bot) {
1225                         sel.ey = term.bot;
1226                         sel.ex = term.col;
1227                 }
1228                 sel.b.y = sel.by, sel.b.x = sel.bx;
1229                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1230         }
1231 }
1232
1233 void
1234 tnewline(int first_col) {
1235         int y = term.c.y;
1236
1237         if(y == term.bot) {
1238                 tscrollup(term.top, 1);
1239         } else {
1240                 y++;
1241         }
1242         tmoveto(first_col ? 0 : term.c.x, y);
1243 }
1244
1245 void
1246 csiparse(void) {
1247         /* int noarg = 1; */
1248         char *p = csiescseq.buf;
1249
1250         csiescseq.narg = 0;
1251         if(*p == '?')
1252                 csiescseq.priv = 1, p++;
1253
1254         while(p < csiescseq.buf+csiescseq.len) {
1255                 while(isdigit(*p)) {
1256                         csiescseq.arg[csiescseq.narg] *= 10;
1257                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1258                 }
1259                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ) {
1260                         csiescseq.narg++, p++;
1261                 } else {
1262                         csiescseq.mode = *p;
1263                         csiescseq.narg++;
1264
1265                         return;
1266                 }
1267         }
1268 }
1269
1270 /* for absolute user moves, when decom is set */
1271 void
1272 tmoveato(int x, int y) {
1273         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1274 }
1275
1276 void
1277 tmoveto(int x, int y) {
1278         int miny, maxy;
1279
1280         if(term.c.state & CURSOR_ORIGIN) {
1281                 miny = term.top;
1282                 maxy = term.bot;
1283         } else {
1284                 miny = 0;
1285                 maxy = term.row - 1;
1286         }
1287         LIMIT(x, 0, term.col-1);
1288         LIMIT(y, miny, maxy);
1289         term.c.state &= ~CURSOR_WRAPNEXT;
1290         term.c.x = x;
1291         term.c.y = y;
1292 }
1293
1294 void
1295 tsetchar(char *c, Glyph *attr, int x, int y) {
1296         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1297                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1298                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1299                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1300                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1301                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1302                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1303                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1304                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1305         };
1306
1307         /*
1308          * The table is proudly stolen from rxvt.
1309          */
1310         if(attr->mode & ATTR_GFX) {
1311                 if(c[0] >= 0x41 && c[0] <= 0x7e
1312                                 && vt100_0[c[0] - 0x41]) {
1313                         c = vt100_0[c[0] - 0x41];
1314                 }
1315         }
1316
1317         term.dirty[y] = 1;
1318         term.line[y][x] = *attr;
1319         memcpy(term.line[y][x].c, c, UTF_SIZ);
1320         term.line[y][x].state |= GLYPH_SET;
1321 }
1322
1323 void
1324 tclearregion(int x1, int y1, int x2, int y2, int bce) {
1325         int x, y, temp;
1326
1327         if(x1 > x2)
1328                 temp = x1, x1 = x2, x2 = temp;
1329         if(y1 > y2)
1330                 temp = y1, y1 = y2, y2 = temp;
1331
1332         LIMIT(x1, 0, term.col-1);
1333         LIMIT(x2, 0, term.col-1);
1334         LIMIT(y1, 0, term.row-1);
1335         LIMIT(y2, 0, term.row-1);
1336
1337         for(y = y1; y <= y2; y++) {
1338                 term.dirty[y] = 1;
1339                 for(x = x1; x <= x2; x++) {
1340                         if(bce) {
1341                                 term.line[y][x] = term.c.attr;
1342                                 memcpy(term.line[y][x].c, " ", 2);
1343                                 term.line[y][x].state |= GLYPH_SET;
1344                         } else {
1345                                 term.line[y][x].state = 0;
1346                         }
1347                 }
1348         }
1349 }
1350
1351 void
1352 tdeletechar(int n) {
1353         int src = term.c.x + n;
1354         int dst = term.c.x;
1355         int size = term.col - src;
1356
1357         term.dirty[term.c.y] = 1;
1358
1359         if(src >= term.col) {
1360                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y, 0);
1361                 return;
1362         }
1363
1364         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1365                         size * sizeof(Glyph));
1366         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y, 0);
1367 }
1368
1369 void
1370 tinsertblank(int n) {
1371         int src = term.c.x;
1372         int dst = src + n;
1373         int size = term.col - dst;
1374
1375         term.dirty[term.c.y] = 1;
1376
1377         if(dst >= term.col) {
1378                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y, 0);
1379                 return;
1380         }
1381
1382         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1383                         size * sizeof(Glyph));
1384         tclearregion(src, term.c.y, dst - 1, term.c.y, 0);
1385 }
1386
1387 void
1388 tinsertblankline(int n) {
1389         if(term.c.y < term.top || term.c.y > term.bot)
1390                 return;
1391
1392         tscrolldown(term.c.y, n);
1393 }
1394
1395 void
1396 tdeleteline(int n) {
1397         if(term.c.y < term.top || term.c.y > term.bot)
1398                 return;
1399
1400         tscrollup(term.c.y, n);
1401 }
1402
1403 void
1404 tsetattr(int *attr, int l) {
1405         int i;
1406
1407         for(i = 0; i < l; i++) {
1408                 switch(attr[i]) {
1409                 case 0:
1410                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1411                                         | ATTR_ITALIC | ATTR_BLINK);
1412                         term.c.attr.fg = defaultfg;
1413                         term.c.attr.bg = defaultbg;
1414                         break;
1415                 case 1:
1416                         term.c.attr.mode |= ATTR_BOLD;
1417                         break;
1418                 case 3:
1419                         term.c.attr.mode |= ATTR_ITALIC;
1420                         break;
1421                 case 4:
1422                         term.c.attr.mode |= ATTR_UNDERLINE;
1423                         break;
1424                 case 5:
1425                         term.c.attr.mode |= ATTR_BLINK;
1426                         break;
1427                 case 7:
1428                         term.c.attr.mode |= ATTR_REVERSE;
1429                         break;
1430                 case 21:
1431                 case 22:
1432                         term.c.attr.mode &= ~ATTR_BOLD;
1433                         break;
1434                 case 23:
1435                         term.c.attr.mode &= ~ATTR_ITALIC;
1436                         break;
1437                 case 24:
1438                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1439                         break;
1440                 case 25:
1441                         term.c.attr.mode &= ~ATTR_BLINK;
1442                         break;
1443                 case 27:
1444                         term.c.attr.mode &= ~ATTR_REVERSE;
1445                         break;
1446                 case 38:
1447                         if(i + 2 < l && attr[i + 1] == 5) {
1448                                 i += 2;
1449                                 if(BETWEEN(attr[i], 0, 255)) {
1450                                         term.c.attr.fg = attr[i];
1451                                 } else {
1452                                         fprintf(stderr,
1453                                                 "erresc: bad fgcolor %d\n",
1454                                                 attr[i]);
1455                                 }
1456                         } else {
1457                                 fprintf(stderr,
1458                                         "erresc(38): gfx attr %d unknown\n",
1459                                         attr[i]);
1460                         }
1461                         break;
1462                 case 39:
1463                         term.c.attr.fg = defaultfg;
1464                         break;
1465                 case 48:
1466                         if(i + 2 < l && attr[i + 1] == 5) {
1467                                 i += 2;
1468                                 if(BETWEEN(attr[i], 0, 255)) {
1469                                         term.c.attr.bg = attr[i];
1470                                 } else {
1471                                         fprintf(stderr,
1472                                                 "erresc: bad bgcolor %d\n",
1473                                                 attr[i]);
1474                                 }
1475                         } else {
1476                                 fprintf(stderr,
1477                                         "erresc(48): gfx attr %d unknown\n",
1478                                         attr[i]);
1479                         }
1480                         break;
1481                 case 49:
1482                         term.c.attr.bg = defaultbg;
1483                         break;
1484                 default:
1485                         if(BETWEEN(attr[i], 30, 37)) {
1486                                 term.c.attr.fg = attr[i] - 30;
1487                         } else if(BETWEEN(attr[i], 40, 47)) {
1488                                 term.c.attr.bg = attr[i] - 40;
1489                         } else if(BETWEEN(attr[i], 90, 97)) {
1490                                 term.c.attr.fg = attr[i] - 90 + 8;
1491                         } else if(BETWEEN(attr[i], 100, 107)) {
1492                                 term.c.attr.bg = attr[i] - 100 + 8;
1493                         } else {
1494                                 fprintf(stderr,
1495                                         "erresc(default): gfx attr %d unknown\n",
1496                                         attr[i]), csidump();
1497                         }
1498                         break;
1499                 }
1500         }
1501 }
1502
1503 void
1504 tsetscroll(int t, int b) {
1505         int temp;
1506
1507         LIMIT(t, 0, term.row-1);
1508         LIMIT(b, 0, term.row-1);
1509         if(t > b) {
1510                 temp = t;
1511                 t = b;
1512                 b = temp;
1513         }
1514         term.top = t;
1515         term.bot = b;
1516 }
1517
1518 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1519
1520 void
1521 tsetmode(bool priv, bool set, int *args, int narg) {
1522         int *lim, mode;
1523         bool alt;
1524
1525         for(lim = args + narg; args < lim; ++args) {
1526                 if(priv) {
1527                         switch(*args) {
1528                                 break;
1529                         case 1: /* DECCKM -- Cursor key */
1530                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1531                                 break;
1532                         case 5: /* DECSCNM -- Reverse video */
1533                                 mode = term.mode;
1534                                 MODBIT(term.mode, set, MODE_REVERSE);
1535                                 if(mode != term.mode)
1536                                         redraw(REDRAW_TIMEOUT);
1537                                 break;
1538                         case 6: /* DECOM -- Origin */
1539                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1540                                 tmoveato(0, 0);
1541                                 break;
1542                         case 7: /* DECAWM -- Auto wrap */
1543                                 MODBIT(term.mode, set, MODE_WRAP);
1544                                 break;
1545                         case 0:  /* Error (IGNORED) */
1546                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1547                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1548                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1549                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1550                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1551                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1552                         case 42: /* DECNRCM -- National characters (IGNORED) */
1553                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1554                                 break;
1555                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1556                                 MODBIT(term.mode, !set, MODE_HIDE);
1557                                 break;
1558                         case 1000: /* 1000,1002: enable xterm mouse report */
1559                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1560                                 break;
1561                         case 1002:
1562                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1563                                 break;
1564                         case 1006:
1565                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1566                                 break;
1567                         case 1049: /* = 1047 and 1048 */
1568                         case 47:
1569                         case 1047: {
1570                                 alt = IS_SET(MODE_ALTSCREEN);
1571                                 if(alt) {
1572                                         tclearregion(0, 0, term.col-1,
1573                                                         term.row-1, 0);
1574                                 }
1575                                 if(set ^ alt)           /* set is always 1 or 0 */
1576                                         tswapscreen();
1577                                 if(*args != 1049)
1578                                         break;
1579                         }
1580                                 /* pass through */
1581                         case 1048:
1582                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1583                                 break;
1584                         default:
1585                                 fprintf(stderr,
1586                                         "erresc: unknown private set/reset mode %d\n",
1587                                         *args);
1588                                 break;
1589                         }
1590                 } else {
1591                         switch(*args) {
1592                         case 0:  /* Error (IGNORED) */
1593                                 break;
1594                         case 2:  /* KAM -- keyboard action */
1595                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1596                                 break;
1597                         case 4:  /* IRM -- Insertion-replacement */
1598                                 MODBIT(term.mode, set, MODE_INSERT);
1599                                 break;
1600                         case 12: /* SRM -- Send/Receive */
1601                                 MODBIT(term.mode, !set, MODE_ECHO);
1602                                 break;
1603                         case 20: /* LNM -- Linefeed/new line */
1604                                 MODBIT(term.mode, set, MODE_CRLF);
1605                                 break;
1606                         default:
1607                                 fprintf(stderr,
1608                                         "erresc: unknown set/reset mode %d\n",
1609                                         *args);
1610                                 break;
1611                         }
1612                 }
1613         }
1614 }
1615 #undef MODBIT
1616
1617
1618 void
1619 csihandle(void) {
1620         switch(csiescseq.mode) {
1621         default:
1622         unknown:
1623                 fprintf(stderr, "erresc: unknown csi ");
1624                 csidump();
1625                 /* die(""); */
1626                 break;
1627         case '@': /* ICH -- Insert <n> blank char */
1628                 DEFAULT(csiescseq.arg[0], 1);
1629                 tinsertblank(csiescseq.arg[0]);
1630                 break;
1631         case 'A': /* CUU -- Cursor <n> Up */
1632                 DEFAULT(csiescseq.arg[0], 1);
1633                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1634                 break;
1635         case 'B': /* CUD -- Cursor <n> Down */
1636         case 'e': /* VPR --Cursor <n> Down */
1637                 DEFAULT(csiescseq.arg[0], 1);
1638                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1639                 break;
1640         case 'c': /* DA -- Device Attributes */
1641                 if(csiescseq.arg[0] == 0)
1642                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1643                 break;
1644         case 'C': /* CUF -- Cursor <n> Forward */
1645         case 'a': /* HPR -- Cursor <n> Forward */
1646                 DEFAULT(csiescseq.arg[0], 1);
1647                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1648                 break;
1649         case 'D': /* CUB -- Cursor <n> Backward */
1650                 DEFAULT(csiescseq.arg[0], 1);
1651                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1652                 break;
1653         case 'E': /* CNL -- Cursor <n> Down and first col */
1654                 DEFAULT(csiescseq.arg[0], 1);
1655                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1656                 break;
1657         case 'F': /* CPL -- Cursor <n> Up and first col */
1658                 DEFAULT(csiescseq.arg[0], 1);
1659                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1660                 break;
1661         case 'g': /* TBC -- Tabulation clear */
1662                 switch (csiescseq.arg[0]) {
1663                 case 0: /* clear current tab stop */
1664                         term.tabs[term.c.x] = 0;
1665                         break;
1666                 case 3: /* clear all the tabs */
1667                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1668                         break;
1669                 default:
1670                         goto unknown;
1671                 }
1672                 break;
1673         case 'G': /* CHA -- Move to <col> */
1674         case '`': /* HPA */
1675                 DEFAULT(csiescseq.arg[0], 1);
1676                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1677                 break;
1678         case 'H': /* CUP -- Move to <row> <col> */
1679         case 'f': /* HVP */
1680                 DEFAULT(csiescseq.arg[0], 1);
1681                 DEFAULT(csiescseq.arg[1], 1);
1682                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1683                 break;
1684         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1685                 DEFAULT(csiescseq.arg[0], 1);
1686                 while(csiescseq.arg[0]--)
1687                         tputtab(1);
1688                 break;
1689         case 'J': /* ED -- Clear screen */
1690                 sel.bx = -1;
1691                 switch(csiescseq.arg[0]) {
1692                 case 0: /* below */
1693                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y, 1);
1694                         if(term.c.y < term.row-1) {
1695                                 tclearregion(0, term.c.y+1, term.col-1,
1696                                                 term.row-1, 1);
1697                         }
1698                         break;
1699                 case 1: /* above */
1700                         if(term.c.y > 1)
1701                                 tclearregion(0, 0, term.col-1, term.c.y-1, 1);
1702                         tclearregion(0, term.c.y, term.c.x, term.c.y, 1);
1703                         break;
1704                 case 2: /* all */
1705                         tclearregion(0, 0, term.col-1, term.row-1, 1);
1706                         break;
1707                 default:
1708                         goto unknown;
1709                 }
1710                 break;
1711         case 'K': /* EL -- Clear line */
1712                 switch(csiescseq.arg[0]) {
1713                 case 0: /* right */
1714                         tclearregion(term.c.x, term.c.y, term.col-1,
1715                                         term.c.y, 1);
1716                         break;
1717                 case 1: /* left */
1718                         tclearregion(0, term.c.y, term.c.x, term.c.y, 1);
1719                         break;
1720                 case 2: /* all */
1721                         tclearregion(0, term.c.y, term.col-1, term.c.y, 1);
1722                         break;
1723                 }
1724                 break;
1725         case 'S': /* SU -- Scroll <n> line up */
1726                 DEFAULT(csiescseq.arg[0], 1);
1727                 tscrollup(term.top, csiescseq.arg[0]);
1728                 break;
1729         case 'T': /* SD -- Scroll <n> line down */
1730                 DEFAULT(csiescseq.arg[0], 1);
1731                 tscrolldown(term.top, csiescseq.arg[0]);
1732                 break;
1733         case 'L': /* IL -- Insert <n> blank lines */
1734                 DEFAULT(csiescseq.arg[0], 1);
1735                 tinsertblankline(csiescseq.arg[0]);
1736                 break;
1737         case 'l': /* RM -- Reset Mode */
1738                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1739                 break;
1740         case 'M': /* DL -- Delete <n> lines */
1741                 DEFAULT(csiescseq.arg[0], 1);
1742                 tdeleteline(csiescseq.arg[0]);
1743                 break;
1744         case 'X': /* ECH -- Erase <n> char */
1745                 DEFAULT(csiescseq.arg[0], 1);
1746                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0],
1747                                 term.c.y, 0);
1748                 break;
1749         case 'P': /* DCH -- Delete <n> char */
1750                 DEFAULT(csiescseq.arg[0], 1);
1751                 tdeletechar(csiescseq.arg[0]);
1752                 break;
1753         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1754                 DEFAULT(csiescseq.arg[0], 1);
1755                 while(csiescseq.arg[0]--)
1756                         tputtab(0);
1757                 break;
1758         case 'd': /* VPA -- Move to <row> */
1759                 DEFAULT(csiescseq.arg[0], 1);
1760                 tmoveato(term.c.x, csiescseq.arg[0]-1);
1761                 break;
1762         case 'h': /* SM -- Set terminal mode */
1763                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1764                 break;
1765         case 'm': /* SGR -- Terminal attribute (color) */
1766                 tsetattr(csiescseq.arg, csiescseq.narg);
1767                 break;
1768         case 'r': /* DECSTBM -- Set Scrolling Region */
1769                 if(csiescseq.priv) {
1770                         goto unknown;
1771                 } else {
1772                         DEFAULT(csiescseq.arg[0], 1);
1773                         DEFAULT(csiescseq.arg[1], term.row);
1774                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1775                         tmoveato(0, 0);
1776                 }
1777                 break;
1778         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1779                 tcursor(CURSOR_SAVE);
1780                 break;
1781         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1782                 tcursor(CURSOR_LOAD);
1783                 break;
1784         }
1785 }
1786
1787 void
1788 csidump(void) {
1789         int i;
1790         uint c;
1791
1792         printf("ESC[");
1793         for(i = 0; i < csiescseq.len; i++) {
1794                 c = csiescseq.buf[i] & 0xff;
1795                 if(isprint(c)) {
1796                         putchar(c);
1797                 } else if(c == '\n') {
1798                         printf("(\\n)");
1799                 } else if(c == '\r') {
1800                         printf("(\\r)");
1801                 } else if(c == 0x1b) {
1802                         printf("(\\e)");
1803                 } else {
1804                         printf("(%02x)", c);
1805                 }
1806         }
1807         putchar('\n');
1808 }
1809
1810 void
1811 csireset(void) {
1812         memset(&csiescseq, 0, sizeof(csiescseq));
1813 }
1814
1815 void
1816 strhandle(void) {
1817         char *p;
1818
1819         /*
1820          * TODO: make this being useful in case of color palette change.
1821          */
1822         strparse();
1823
1824         p = strescseq.buf;
1825
1826         switch(strescseq.type) {
1827         case ']': /* OSC -- Operating System Command */
1828                 switch(p[0]) {
1829                 case '0':
1830                 case '1':
1831                 case '2':
1832                         /*
1833                          * TODO: Handle special chars in string, like umlauts.
1834                          */
1835                         if(p[1] == ';') {
1836                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1837                         }
1838                         break;
1839                 case ';':
1840                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1841                         break;
1842                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1843                         break;
1844                 default:
1845                         fprintf(stderr, "erresc: unknown str ");
1846                         strdump();
1847                         break;
1848                 }
1849                 break;
1850         case 'k': /* old title set compatibility */
1851                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1852                 break;
1853         case 'P': /* DSC -- Device Control String */
1854         case '_': /* APC -- Application Program Command */
1855         case '^': /* PM -- Privacy Message */
1856         default:
1857                 fprintf(stderr, "erresc: unknown str ");
1858                 strdump();
1859                 /* die(""); */
1860                 break;
1861         }
1862 }
1863
1864 void
1865 strparse(void) {
1866         /*
1867          * TODO: Implement parsing like for CSI when required.
1868          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1869          */
1870         return;
1871 }
1872
1873 void
1874 strdump(void) {
1875         int i;
1876         uint c;
1877
1878         printf("ESC%c", strescseq.type);
1879         for(i = 0; i < strescseq.len; i++) {
1880                 c = strescseq.buf[i] & 0xff;
1881                 if(isprint(c)) {
1882                         putchar(c);
1883                 } else if(c == '\n') {
1884                         printf("(\\n)");
1885                 } else if(c == '\r') {
1886                         printf("(\\r)");
1887                 } else if(c == 0x1b) {
1888                         printf("(\\e)");
1889                 } else {
1890                         printf("(%02x)", c);
1891                 }
1892         }
1893         printf("ESC\\\n");
1894 }
1895
1896 void
1897 strreset(void) {
1898         memset(&strescseq, 0, sizeof(strescseq));
1899 }
1900
1901 void
1902 tputtab(bool forward) {
1903         uint x = term.c.x;
1904
1905         if(forward) {
1906                 if(x == term.col)
1907                         return;
1908                 for(++x; x < term.col && !term.tabs[x]; ++x)
1909                         /* nothing */ ;
1910         } else {
1911                 if(x == 0)
1912                         return;
1913                 for(--x; x > 0 && !term.tabs[x]; --x)
1914                         /* nothing */ ;
1915         }
1916         tmoveto(x, term.c.y);
1917 }
1918
1919 void
1920 techo(char *buf, int len) {
1921         for(; len > 0; buf++, len--) {
1922                 char c = *buf;
1923
1924                 if(c == '\033') {               /* escape */
1925                         tputc("^", 1);
1926                         tputc("[", 1);
1927                 } else if (c < '\x20') {        /* control code */
1928                         if(c != '\n' && c != '\r' && c != '\t') {
1929                                 c |= '\x40';
1930                                 tputc("^", 1);
1931                         }
1932                         tputc(&c, 1);
1933                 } else {
1934                         break;
1935                 }
1936         }
1937         if (len)
1938                 tputc(buf, len);
1939 }
1940
1941 void
1942 tputc(char *c, int len) {
1943         uchar ascii = *c;
1944         bool control = ascii < '\x20' || ascii == 0177;
1945
1946         if(iofd != -1) {
1947                 if (xwrite(iofd, c, len) < 0) {
1948                         fprintf(stderr, "Error writing in %s:%s\n",
1949                                 opt_io, strerror(errno));
1950                         close(iofd);
1951                         iofd = -1;
1952                 }
1953         }
1954
1955         /*
1956          * STR sequences must be checked before anything else
1957          * because it can use some control codes as part of the sequence.
1958          */
1959         if(term.esc & ESC_STR) {
1960                 switch(ascii) {
1961                 case '\033':
1962                         term.esc = ESC_START | ESC_STR_END;
1963                         break;
1964                 case '\a': /* backwards compatibility to xterm */
1965                         term.esc = 0;
1966                         strhandle();
1967                         break;
1968                 default:
1969                         if(strescseq.len + len < sizeof(strescseq.buf)) {
1970                                 memmove(&strescseq.buf[strescseq.len], c, len);
1971                                 strescseq.len += len;
1972                         } else {
1973                         /*
1974                          * Here is a bug in terminals. If the user never sends
1975                          * some code to stop the str or esc command, then st
1976                          * will stop responding. But this is better than
1977                          * silently failing with unknown characters. At least
1978                          * then users will report back.
1979                          *
1980                          * In the case users ever get fixed, here is the code:
1981                          */
1982                         /*
1983                          * term.esc = 0;
1984                          * strhandle();
1985                          */
1986                         }
1987                 }
1988                 return;
1989         }
1990
1991         /*
1992          * Actions of control codes must be performed as soon they arrive
1993          * because they can be embedded inside a control sequence, and
1994          * they must not cause conflicts with sequences.
1995          */
1996         if(control) {
1997                 switch(ascii) {
1998                 case '\t':      /* HT */
1999                         tputtab(1);
2000                         return;
2001                 case '\b':      /* BS */
2002                         tmoveto(term.c.x-1, term.c.y);
2003                         return;
2004                 case '\r':      /* CR */
2005                         tmoveto(0, term.c.y);
2006                         return;
2007                 case '\f':      /* LF */
2008                 case '\v':      /* VT */
2009                 case '\n':      /* LF */
2010                         /* go to first col if the mode is set */
2011                         tnewline(IS_SET(MODE_CRLF));
2012                         return;
2013                 case '\a':      /* BEL */
2014                         if(!(xw.state & WIN_FOCUSED))
2015                                 xseturgency(1);
2016                         return;
2017                 case '\033':    /* ESC */
2018                         csireset();
2019                         term.esc = ESC_START;
2020                         return;
2021                 case '\016':    /* SO */
2022                 case '\017':    /* SI */
2023                         /*
2024                          * Different charsets are hard to handle. Applications
2025                          * should use the right alt charset escapes for the
2026                          * only reason they still exist: line drawing. The
2027                          * rest is incompatible history st should not support.
2028                          */
2029                         return;
2030                 case '\032':    /* SUB */
2031                 case '\030':    /* CAN */
2032                         csireset();
2033                         return;
2034                 case '\005':    /* ENQ (IGNORED) */
2035                 case '\000':    /* NUL (IGNORED) */
2036                 case '\021':    /* XON (IGNORED) */
2037                 case '\023':    /* XOFF (IGNORED) */
2038                 case 0177:      /* DEL (IGNORED) */
2039                         return;
2040                 }
2041         } else if(term.esc & ESC_START) {
2042                 if(term.esc & ESC_CSI) {
2043                         csiescseq.buf[csiescseq.len++] = ascii;
2044                         if(BETWEEN(ascii, 0x40, 0x7E)
2045                                         || csiescseq.len >= ESC_BUF_SIZ) {
2046                                 term.esc = 0;
2047                                 csiparse(), csihandle();
2048                         }
2049                 } else if(term.esc & ESC_STR_END) {
2050                         term.esc = 0;
2051                         if(ascii == '\\')
2052                                 strhandle();
2053                 } else if(term.esc & ESC_ALTCHARSET) {
2054                         switch(ascii) {
2055                         case '0': /* Line drawing set */
2056                                 term.c.attr.mode |= ATTR_GFX;
2057                                 break;
2058                         case 'B': /* USASCII */
2059                                 term.c.attr.mode &= ~ATTR_GFX;
2060                                 break;
2061                         case 'A': /* UK (IGNORED) */
2062                         case '<': /* multinational charset (IGNORED) */
2063                         case '5': /* Finnish (IGNORED) */
2064                         case 'C': /* Finnish (IGNORED) */
2065                         case 'K': /* German (IGNORED) */
2066                                 break;
2067                         default:
2068                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2069                         }
2070                         term.esc = 0;
2071                 } else if(term.esc & ESC_TEST) {
2072                         if(ascii == '8') { /* DEC screen alignment test. */
2073                                 char E[UTF_SIZ] = "E";
2074                                 int x, y;
2075
2076                                 for(x = 0; x < term.col; ++x) {
2077                                         for(y = 0; y < term.row; ++y)
2078                                                 tsetchar(E, &term.c.attr, x, y);
2079                                 }
2080                         }
2081                         term.esc = 0;
2082                 } else {
2083                         switch(ascii) {
2084                         case '[':
2085                                 term.esc |= ESC_CSI;
2086                                 break;
2087                         case '#':
2088                                 term.esc |= ESC_TEST;
2089                                 break;
2090                         case 'P': /* DCS -- Device Control String */
2091                         case '_': /* APC -- Application Program Command */
2092                         case '^': /* PM -- Privacy Message */
2093                         case ']': /* OSC -- Operating System Command */
2094                         case 'k': /* old title set compatibility */
2095                                 strreset();
2096                                 strescseq.type = ascii;
2097                                 term.esc |= ESC_STR;
2098                                 break;
2099                         case '(': /* set primary charset G0 */
2100                                 term.esc |= ESC_ALTCHARSET;
2101                                 break;
2102                         case ')': /* set secondary charset G1 (IGNORED) */
2103                         case '*': /* set tertiary charset G2 (IGNORED) */
2104                         case '+': /* set quaternary charset G3 (IGNORED) */
2105                                 term.esc = 0;
2106                                 break;
2107                         case 'D': /* IND -- Linefeed */
2108                                 if(term.c.y == term.bot) {
2109                                         tscrollup(term.top, 1);
2110                                 } else {
2111                                         tmoveto(term.c.x, term.c.y+1);
2112                                 }
2113                                 term.esc = 0;
2114                                 break;
2115                         case 'E': /* NEL -- Next line */
2116                                 tnewline(1); /* always go to first col */
2117                                 term.esc = 0;
2118                                 break;
2119                         case 'H': /* HTS -- Horizontal tab stop */
2120                                 term.tabs[term.c.x] = 1;
2121                                 term.esc = 0;
2122                                 break;
2123                         case 'M': /* RI -- Reverse index */
2124                                 if(term.c.y == term.top) {
2125                                         tscrolldown(term.top, 1);
2126                                 } else {
2127                                         tmoveto(term.c.x, term.c.y-1);
2128                                 }
2129                                 term.esc = 0;
2130                                 break;
2131                         case 'Z': /* DECID -- Identify Terminal */
2132                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2133                                 term.esc = 0;
2134                                 break;
2135                         case 'c': /* RIS -- Reset to inital state */
2136                                 treset();
2137                                 term.esc = 0;
2138                                 xresettitle();
2139                                 break;
2140                         case '=': /* DECPAM -- Application keypad */
2141                                 term.mode |= MODE_APPKEYPAD;
2142                                 term.esc = 0;
2143                                 break;
2144                         case '>': /* DECPNM -- Normal keypad */
2145                                 term.mode &= ~MODE_APPKEYPAD;
2146                                 term.esc = 0;
2147                                 break;
2148                         case '7': /* DECSC -- Save Cursor */
2149                                 tcursor(CURSOR_SAVE);
2150                                 term.esc = 0;
2151                                 break;
2152                         case '8': /* DECRC -- Restore Cursor */
2153                                 tcursor(CURSOR_LOAD);
2154                                 term.esc = 0;
2155                                 break;
2156                         case '\\': /* ST -- Stop */
2157                                 term.esc = 0;
2158                                 break;
2159                         default:
2160                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2161                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2162                                 term.esc = 0;
2163                         }
2164                 }
2165                 /*
2166                  * All characters which form part of a sequence are not
2167                  * printed
2168                  */
2169                 return;
2170         }
2171         /*
2172          * Display control codes only if we are in graphic mode
2173          */
2174         if(control && !(term.c.attr.mode & ATTR_GFX))
2175                 return;
2176         if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
2177                 sel.bx = -1;
2178         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
2179                 tnewline(1); /* always go to first col */
2180
2181         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2182                 memmove(&term.line[term.c.y][term.c.x+1],
2183                         &term.line[term.c.y][term.c.x],
2184                         (term.col - term.c.x - 1) * sizeof(Glyph));
2185         }
2186
2187         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2188         if(term.c.x+1 < term.col) {
2189                 tmoveto(term.c.x+1, term.c.y);
2190         } else {
2191                 term.c.state |= CURSOR_WRAPNEXT;
2192         }
2193 }
2194
2195 int
2196 tresize(int col, int row) {
2197         int i, x;
2198         int minrow = MIN(row, term.row);
2199         int mincol = MIN(col, term.col);
2200         int slide = term.c.y - row + 1;
2201         bool *bp;
2202
2203         if(col < 1 || row < 1)
2204                 return 0;
2205
2206         /* free unneeded rows */
2207         i = 0;
2208         if(slide > 0) {
2209                 /* slide screen to keep cursor where we expect it -
2210                  * tscrollup would work here, but we can optimize to
2211                  * memmove because we're freeing the earlier lines */
2212                 for(/* i = 0 */; i < slide; i++) {
2213                         free(term.line[i]);
2214                         free(term.alt[i]);
2215                 }
2216                 memmove(term.line, term.line + slide, row * sizeof(Line));
2217                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2218         }
2219         for(i += row; i < term.row; i++) {
2220                 free(term.line[i]);
2221                 free(term.alt[i]);
2222         }
2223
2224         /* resize to new height */
2225         term.line = xrealloc(term.line, row * sizeof(Line));
2226         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2227         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2228         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2229
2230         /* resize each row to new width, zero-pad if needed */
2231         for(i = 0; i < minrow; i++) {
2232                 term.dirty[i] = 1;
2233                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2234                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2235                 for(x = mincol; x < col; x++) {
2236                         term.line[i][x].state = 0;
2237                         term.alt[i][x].state = 0;
2238                 }
2239         }
2240
2241         /* allocate any new rows */
2242         for(/* i == minrow */; i < row; i++) {
2243                 term.dirty[i] = 1;
2244                 term.line[i] = xcalloc(col, sizeof(Glyph));
2245                 term.alt [i] = xcalloc(col, sizeof(Glyph));
2246         }
2247         if(col > term.col) {
2248                 bp = term.tabs + term.col;
2249
2250                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2251                 while(--bp > term.tabs && !*bp)
2252                         /* nothing */ ;
2253                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2254                         *bp = 1;
2255         }
2256         /* update terminal size */
2257         term.col = col;
2258         term.row = row;
2259         /* reset scrolling region */
2260         tsetscroll(0, row-1);
2261         /* make use of the LIMIT in tmoveto */
2262         tmoveto(term.c.x, term.c.y);
2263
2264         return (slide > 0);
2265 }
2266
2267 void
2268 xresize(int col, int row) {
2269         xw.tw = MAX(1, col * xw.cw);
2270         xw.th = MAX(1, row * xw.ch);
2271
2272         if(!usedbe) {
2273                 XFreePixmap(xw.dpy, xw.buf);
2274                 xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2275                                 DefaultDepth(xw.dpy, xw.scr));
2276                 XSetForeground(xw.dpy, dc.gc, 0);
2277                 XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
2278         }
2279
2280         XftDrawChange(xw.draw, xw.buf);
2281 }
2282
2283 void
2284 xloadcols(void) {
2285         int i, r, g, b;
2286         XRenderColor color = { .alpha = 0 };
2287
2288         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2289         for(i = 0; i < LEN(colorname); i++) {
2290                 if(!colorname[i])
2291                         continue;
2292                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2293                         die("Could not allocate color '%s'\n", colorname[i]);
2294                 }
2295         }
2296
2297         /* load colors [16-255] ; same colors as xterm */
2298         for(i = 16, r = 0; r < 6; r++) {
2299                 for(g = 0; g < 6; g++) {
2300                         for(b = 0; b < 6; b++) {
2301                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
2302                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
2303                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
2304                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2305                                         die("Could not allocate color %d\n", i);
2306                                 }
2307                                 i++;
2308                         }
2309                 }
2310         }
2311
2312         for(r = 0; r < 24; r++, i++) {
2313                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2314                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2315                                         &dc.col[i])) {
2316                         die("Could not allocate color %d\n", i);
2317                 }
2318         }
2319 }
2320
2321 void
2322 xtermclear(int col1, int row1, int col2, int row2) {
2323         XftDrawRect(xw.draw,
2324                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2325                         borderpx + col1 * xw.cw,
2326                         borderpx + row1 * xw.ch,
2327                         (col2-col1+1) * xw.cw,
2328                         (row2-row1+1) * xw.ch);
2329 }
2330
2331 /*
2332  * Absolute coordinates.
2333  */
2334 void
2335 xclear(int x1, int y1, int x2, int y2) {
2336         XftDrawRect(xw.draw,
2337                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2338                         x1, y1, x2-x1, y2-y1);
2339 }
2340
2341 void
2342 xhints(void) {
2343         XClassHint class = {opt_class ? opt_class : termname, termname};
2344         XWMHints wm = {.flags = InputHint, .input = 1};
2345         XSizeHints *sizeh = NULL;
2346
2347         sizeh = XAllocSizeHints();
2348         if(xw.isfixed == False) {
2349                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2350                 sizeh->height = xw.h;
2351                 sizeh->width = xw.w;
2352                 sizeh->height_inc = xw.ch;
2353                 sizeh->width_inc = xw.cw;
2354                 sizeh->base_height = 2 * borderpx;
2355                 sizeh->base_width = 2 * borderpx;
2356         } else {
2357                 sizeh->flags = PMaxSize | PMinSize;
2358                 sizeh->min_width = sizeh->max_width = xw.fw;
2359                 sizeh->min_height = sizeh->max_height = xw.fh;
2360         }
2361
2362         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2363         XFree(sizeh);
2364 }
2365
2366 int
2367 xloadfont(Font *f, FcPattern *pattern) {
2368         FcPattern *match;
2369         FcResult result;
2370
2371         match = FcFontMatch(NULL, pattern, &result);
2372         if(!match)
2373                 return 1;
2374
2375         if(!(f->set = FcFontSort(0, match, FcTrue, 0, &result))) {
2376                 FcPatternDestroy(match);
2377                 return 1;
2378         }
2379
2380         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2381                 FcPatternDestroy(match);
2382                 return 1;
2383         }
2384
2385         f->pattern = FcPatternDuplicate(pattern);
2386
2387         f->ascent = f->match->ascent;
2388         f->descent = f->match->descent;
2389         f->lbearing = 0;
2390         f->rbearing = f->match->max_advance_width;
2391
2392         f->height = f->match->height;
2393         f->width = f->lbearing + f->rbearing;
2394
2395         return 0;
2396 }
2397
2398 void
2399 xloadfonts(char *fontstr, int fontsize) {
2400         FcPattern *pattern;
2401         FcResult result;
2402         double fontval;
2403
2404         if(fontstr[0] == '-') {
2405                 pattern = XftXlfdParse(fontstr, False, False);
2406         } else {
2407                 pattern = FcNameParse((FcChar8 *)fontstr);
2408         }
2409
2410         if(!pattern)
2411                 die("st: can't open font %s\n", fontstr);
2412
2413         if(fontsize > 0) {
2414                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2415                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2416                 usedfontsize = fontsize;
2417         } else {
2418                 result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2419                 if(result == FcResultMatch) {
2420                         usedfontsize = (int)fontval;
2421                 } else {
2422                         /*
2423                          * Default font size is 12, if none given. This is to
2424                          * have a known usedfontsize value.
2425                          */
2426                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2427                         usedfontsize = 12;
2428                 }
2429         }
2430
2431         FcConfigSubstitute(0, pattern, FcMatchPattern);
2432         FcDefaultSubstitute(pattern);
2433
2434         if(xloadfont(&dc.font, pattern))
2435                 die("st: can't open font %s\n", fontstr);
2436
2437         /* Setting character width and height. */
2438         xw.cw = dc.font.width;
2439         xw.ch = dc.font.height;
2440
2441         FcPatternDel(pattern, FC_WEIGHT);
2442         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2443         if(xloadfont(&dc.bfont, pattern))
2444                 die("st: can't open font %s\n", fontstr);
2445
2446         FcPatternDel(pattern, FC_SLANT);
2447         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2448         if(xloadfont(&dc.ibfont, pattern))
2449                 die("st: can't open font %s\n", fontstr);
2450
2451         FcPatternDel(pattern, FC_WEIGHT);
2452         if(xloadfont(&dc.ifont, pattern))
2453                 die("st: can't open font %s\n", fontstr);
2454
2455         FcPatternDestroy(pattern);
2456 }
2457
2458 void
2459 xunloadfonts(void)
2460 {
2461         int i, ip;
2462
2463         /*
2464          * Free the loaded fonts in the font cache. This is done backwards
2465          * from the frccur.
2466          */
2467         for (i = 0, ip = frccur; i < frclen; i++, ip--) {
2468                 if (ip < 0)
2469                         ip = LEN(frc) - 1;
2470                 XftFontClose(xw.dpy, frc[ip].font);
2471         }
2472         frccur = -1;
2473         frclen = 0;
2474
2475         XftFontClose(xw.dpy, dc.font.match);
2476         FcPatternDestroy(dc.font.pattern);
2477         FcFontSetDestroy(dc.font.set);
2478         XftFontClose(xw.dpy, dc.bfont.match);
2479         FcPatternDestroy(dc.bfont.pattern);
2480         FcFontSetDestroy(dc.bfont.set);
2481         XftFontClose(xw.dpy, dc.ifont.match);
2482         FcPatternDestroy(dc.ifont.pattern);
2483         FcFontSetDestroy(dc.ifont.set);
2484         XftFontClose(xw.dpy, dc.ibfont.match);
2485         FcPatternDestroy(dc.ibfont.pattern);
2486         FcFontSetDestroy(dc.ibfont.set);
2487 }
2488
2489 void
2490 xzoom(const Arg *arg)
2491 {
2492         xunloadfonts();
2493         xloadfonts(usedfont, usedfontsize + arg->i);
2494         cresize(0, 0);
2495         redraw(0);
2496 }
2497
2498 void
2499 xinit(void) {
2500         XSetWindowAttributes attrs;
2501         XGCValues gcvalues;
2502         Cursor cursor;
2503         Window parent;
2504         int sw, sh, major, minor;
2505
2506         if(!(xw.dpy = XOpenDisplay(NULL)))
2507                 die("Can't open display\n");
2508         xw.scr = XDefaultScreen(xw.dpy);
2509         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2510
2511         /* font */
2512         if (!FcInit())
2513                 die("Could not init fontconfig.\n");
2514
2515         usedfont = (opt_font == NULL)? font : opt_font;
2516         xloadfonts(usedfont, 0);
2517
2518         /* colors */
2519         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2520         xloadcols();
2521
2522         /* adjust fixed window geometry */
2523         if(xw.isfixed) {
2524                 sw = DisplayWidth(xw.dpy, xw.scr);
2525                 sh = DisplayHeight(xw.dpy, xw.scr);
2526                 if(xw.fx < 0)
2527                         xw.fx = sw + xw.fx - xw.fw - 1;
2528                 if(xw.fy < 0)
2529                         xw.fy = sh + xw.fy - xw.fh - 1;
2530
2531                 xw.h = xw.fh;
2532                 xw.w = xw.fw;
2533         } else {
2534                 /* window - default size */
2535                 xw.h = 2 * borderpx + term.row * xw.ch;
2536                 xw.w = 2 * borderpx + term.col * xw.cw;
2537                 xw.fx = 0;
2538                 xw.fy = 0;
2539         }
2540
2541         /* Events */
2542         attrs.background_pixel = dc.col[defaultbg].pixel;
2543         attrs.border_pixel = dc.col[defaultbg].pixel;
2544         attrs.bit_gravity = NorthWestGravity;
2545         attrs.event_mask = FocusChangeMask | KeyPressMask
2546                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2547                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2548         attrs.colormap = xw.cmap;
2549
2550         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
2551                         XRootWindow(xw.dpy, xw.scr);
2552         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2553                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2554                         xw.vis,
2555                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2556                         | CWColormap,
2557                         &attrs);
2558
2559         /* double buffering */
2560         /*
2561         if(XdbeQueryExtension(xw.dpy, &major, &minor)) {
2562                 xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win,
2563                                 XdbeBackground);
2564                 usedbe = True;
2565         } else {
2566         */
2567                 memset(&gcvalues, 0, sizeof(gcvalues));
2568                 gcvalues.graphics_exposures = False;
2569                 dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
2570                                 &gcvalues);
2571                 xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2572                                 DefaultDepth(xw.dpy, xw.scr));
2573                 XSetForeground(xw.dpy, dc.gc, 0);
2574                 XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
2575                 //xw.buf = xw.win;
2576         /*
2577         }
2578         */
2579
2580         /* Xft rendering context */
2581         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2582
2583         /* input methods */
2584         if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2585                 XSetLocaleModifiers("@im=local");
2586                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2587                         XSetLocaleModifiers("@im=");
2588                         if((xw.xim = XOpenIM(xw.dpy,
2589                                         NULL, NULL, NULL)) == NULL) {
2590                                 die("XOpenIM failed. Could not open input"
2591                                         " device.\n");
2592                         }
2593                 }
2594         }
2595         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2596                                            | XIMStatusNothing, XNClientWindow, xw.win,
2597                                            XNFocusWindow, xw.win, NULL);
2598         if(xw.xic == NULL)
2599                 die("XCreateIC failed. Could not obtain input method.\n");
2600
2601         /* white cursor, black outline */
2602         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2603         XDefineCursor(xw.dpy, xw.win, cursor);
2604         XRecolorCursor(xw.dpy, cursor,
2605                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2606                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2607
2608         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2609         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2610         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2611
2612         xresettitle();
2613         XMapWindow(xw.dpy, xw.win);
2614         xhints();
2615         XSync(xw.dpy, 0);
2616 }
2617
2618 void
2619 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2620         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
2621             width = charlen * xw.cw, xp, i;
2622         int frp, frcflags;
2623         int u8fl, u8fblen, u8cblen, doesexist;
2624         char *u8c, *u8fs;
2625         long u8char;
2626         Font *font = &dc.font;
2627         FcResult fcres;
2628         FcPattern *fcpattern, *fontpattern;
2629         FcFontSet *fcsets[] = { NULL };
2630         FcCharSet *fccharset;
2631         Colour *fg = &dc.col[base.fg], *bg = &dc.col[base.bg],
2632                  *temp, revfg, revbg;
2633         XRenderColor colfg, colbg;
2634
2635         frcflags = FRC_NORMAL;
2636
2637         if(base.mode & ATTR_BOLD) {
2638                 if(BETWEEN(base.fg, 0, 7)) {
2639                         /* basic system colors */
2640                         fg = &dc.col[base.fg + 8];
2641                 } else if(BETWEEN(base.fg, 16, 195)) {
2642                         /* 256 colors */
2643                         fg = &dc.col[base.fg + 36];
2644                 } else if(BETWEEN(base.fg, 232, 251)) {
2645                         /* greyscale */
2646                         fg = &dc.col[base.fg + 4];
2647                 }
2648                 /*
2649                  * Those ranges will not be brightened:
2650                  *      8 - 15 – bright system colors
2651                  *      196 - 231 – highest 256 color cube
2652                  *      252 - 255 – brightest colors in greyscale
2653                  */
2654                 font = &dc.bfont;
2655                 frcflags = FRC_BOLD;
2656         }
2657
2658         if(base.mode & ATTR_ITALIC) {
2659                 font = &dc.ifont;
2660                 frcflags = FRC_ITALIC;
2661         }
2662         if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
2663                 font = &dc.ibfont;
2664                 frcflags = FRC_ITALICBOLD;
2665         }
2666
2667         if(IS_SET(MODE_REVERSE)) {
2668                 if(fg == &dc.col[defaultfg]) {
2669                         fg = &dc.col[defaultbg];
2670                 } else {
2671                         colfg.red = ~fg->color.red;
2672                         colfg.green = ~fg->color.green;
2673                         colfg.blue = ~fg->color.blue;
2674                         colfg.alpha = fg->color.alpha;
2675                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
2676                         fg = &revfg;
2677                 }
2678
2679                 if(bg == &dc.col[defaultbg]) {
2680                         bg = &dc.col[defaultfg];
2681                 } else {
2682                         colbg.red = ~bg->color.red;
2683                         colbg.green = ~bg->color.green;
2684                         colbg.blue = ~bg->color.blue;
2685                         colbg.alpha = bg->color.alpha;
2686                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
2687                         bg = &revbg;
2688                 }
2689         }
2690
2691         if(base.mode & ATTR_REVERSE) {
2692                 temp = fg;
2693                 fg = bg;
2694                 bg = temp;
2695         }
2696
2697         /* Intelligent cleaning up of the borders. */
2698         if(x == 0) {
2699                 xclear(0, (y == 0)? 0 : winy, borderpx,
2700                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
2701         }
2702         if(x + charlen >= term.col) {
2703                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
2704                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
2705         }
2706         if(y == 0)
2707                 xclear(winx, 0, winx + width, borderpx);
2708         if(y == term.row-1)
2709                 xclear(winx, winy + xw.ch, winx + width, xw.h);
2710
2711         /* Clean up the region we want to draw to. */
2712         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
2713
2714         fcsets[0] = font->set;
2715         for (xp = winx; bytelen > 0;) {
2716                 /*
2717                  * Search for the range in the to be printed string of glyphs
2718                  * that are in the main font. Then print that range. If
2719                  * some glyph is found that is not in the font, do the
2720                  * fallback dance.
2721                  */
2722                 u8fs = s;
2723                 u8fblen = 0;
2724                 u8fl = 0;
2725                 for (;;) {
2726                         u8c = s;
2727                         u8cblen = utf8decode(s, &u8char);
2728                         s += u8cblen;
2729                         bytelen -= u8cblen;
2730
2731                         doesexist = XftCharIndex(xw.dpy, font->match, u8char);
2732                         if (!doesexist || bytelen <= 0) {
2733                                 if (bytelen <= 0) {
2734                                         if (doesexist) {
2735                                                 u8fl++;
2736                                                 u8fblen += u8cblen;
2737                                         }
2738                                 }
2739
2740                                 if (u8fl > 0) {
2741                                         XftDrawStringUtf8(xw.draw, fg,
2742                                                         font->match, xp,
2743                                                         winy + font->ascent,
2744                                                         (FcChar8 *)u8fs,
2745                                                         u8fblen);
2746                                         xp += font->width * u8fl;
2747                                 }
2748                                 break;
2749                         }
2750
2751                         u8fl++;
2752                         u8fblen += u8cblen;
2753                 }
2754                 if (doesexist)
2755                         break;
2756
2757                 frp = frccur;
2758                 /* Search the font cache. */
2759                 for (i = 0; i < frclen; i++, frp--) {
2760                         if (frp <= 0)
2761                                 frp = LEN(frc) - 1;
2762
2763                         if (frc[frp].c == u8char
2764                                         && frc[frp].flags == frcflags) {
2765                                 break;
2766                         }
2767                 }
2768
2769                 /* Nothing was found. */
2770                 if (i >= frclen) {
2771                         /*
2772                          * Nothing was found in the cache. Now use
2773                          * some dozen of Fontconfig calls to get the
2774                          * font for one single character.
2775                          */
2776                         fcpattern = FcPatternDuplicate(font->pattern);
2777                         fccharset = FcCharSetCreate();
2778
2779                         FcCharSetAddChar(fccharset, u8char);
2780                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
2781                                         fccharset);
2782                         FcPatternAddBool(fcpattern, FC_SCALABLE,
2783                                         FcTrue);
2784
2785                         FcConfigSubstitute(0, fcpattern,
2786                                         FcMatchPattern);
2787                         FcDefaultSubstitute(fcpattern);
2788
2789                         fontpattern = FcFontSetMatch(0, fcsets,
2790                                         FcTrue, fcpattern, &fcres);
2791
2792                         /*
2793                          * Overwrite or create the new cache entry
2794                          * entry.
2795                          */
2796                         frccur++;
2797                         frclen++;
2798                         if (frccur >= LEN(frc))
2799                                 frccur = 0;
2800                         if (frclen > LEN(frc)) {
2801                                 frclen = LEN(frc);
2802                                 XftFontClose(xw.dpy, frc[frccur].font);
2803                         }
2804
2805                         frc[frccur].font = XftFontOpenPattern(xw.dpy,
2806                                         fontpattern);
2807                         frc[frccur].c = u8char;
2808                         frc[frccur].flags = frcflags;
2809
2810                         FcPatternDestroy(fcpattern);
2811                         FcCharSetDestroy(fccharset);
2812
2813                         frp = frccur;
2814                 }
2815
2816                 XftDrawStringUtf8(xw.draw, fg, frc[frp].font,
2817                                 xp, winy + frc[frp].font->ascent,
2818                                 (FcChar8 *)u8c, u8cblen);
2819
2820                 xp += font->width;
2821         }
2822
2823         /*
2824         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
2825                         winy + font->ascent, (FcChar8 *)s, bytelen);
2826         */
2827
2828         if(base.mode & ATTR_UNDERLINE) {
2829                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
2830                                 width, 1);
2831         }
2832 }
2833
2834 void
2835 xdrawcursor(void) {
2836         static int oldx = 0, oldy = 0;
2837         int sl;
2838         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs, 0};
2839
2840         LIMIT(oldx, 0, term.col-1);
2841         LIMIT(oldy, 0, term.row-1);
2842
2843         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2844                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2845
2846         /* remove the old cursor */
2847         if(term.line[oldy][oldx].state & GLYPH_SET) {
2848                 sl = utf8size(term.line[oldy][oldx].c);
2849                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
2850                                 oldy, 1, sl);
2851         } else {
2852                 xtermclear(oldx, oldy, oldx, oldy);
2853         }
2854
2855         /* draw the new one */
2856         if(!(IS_SET(MODE_HIDE))) {
2857                 if(!(xw.state & WIN_FOCUSED))
2858                         g.bg = defaultucs;
2859
2860                 if(IS_SET(MODE_REVERSE))
2861                         g.mode |= ATTR_REVERSE, g.fg = defaultcs, g.bg = defaultfg;
2862
2863                 sl = utf8size(g.c);
2864                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2865                 oldx = term.c.x, oldy = term.c.y;
2866         }
2867 }
2868
2869 void
2870 xresettitle(void) {
2871         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2872 }
2873
2874 void
2875 redraw(int timeout) {
2876         struct timespec tv = {0, timeout * 1000};
2877
2878         tfulldirt();
2879         draw();
2880
2881         if(timeout > 0) {
2882                 nanosleep(&tv, NULL);
2883                 XSync(xw.dpy, False); /* necessary for a good tput flash */
2884         }
2885 }
2886
2887 void
2888 draw(void) {
2889         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2890
2891         drawregion(0, 0, term.col, term.row);
2892         if(usedbe) {
2893                 XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2894         } else {
2895                 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
2896                                 xw.h, 0, 0);
2897                 XSetForeground(xw.dpy, dc.gc, 0);
2898         }
2899 }
2900
2901 void
2902 drawregion(int x1, int y1, int x2, int y2) {
2903         int ic, ib, x, y, ox, sl;
2904         Glyph base, new;
2905         char buf[DRAW_BUF_SIZ];
2906         bool ena_sel = sel.bx != -1;
2907
2908         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
2909                 ena_sel = 0;
2910
2911         if(!(xw.state & WIN_VISIBLE))
2912                 return;
2913
2914         for(y = y1; y < y2; y++) {
2915                 if(!term.dirty[y])
2916                         continue;
2917
2918                 xtermclear(0, y, term.col, y);
2919                 term.dirty[y] = 0;
2920                 base = term.line[y][0];
2921                 ic = ib = ox = 0;
2922                 for(x = x1; x < x2; x++) {
2923                         new = term.line[y][x];
2924                         if(ena_sel && *(new.c) && selected(x, y))
2925                                 new.mode ^= ATTR_REVERSE;
2926                         if(ib > 0 && (!(new.state & GLYPH_SET)
2927                                         || ATTRCMP(base, new)
2928                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2929                                 xdraws(buf, base, ox, y, ic, ib);
2930                                 ic = ib = 0;
2931                         }
2932                         if(new.state & GLYPH_SET) {
2933                                 if(ib == 0) {
2934                                         ox = x;
2935                                         base = new;
2936                                 }
2937
2938                                 sl = utf8size(new.c);
2939                                 memcpy(buf+ib, new.c, sl);
2940                                 ib += sl;
2941                                 ++ic;
2942                         }
2943                 }
2944                 if(ib > 0)
2945                         xdraws(buf, base, ox, y, ic, ib);
2946         }
2947         xdrawcursor();
2948 }
2949
2950 void
2951 expose(XEvent *ev) {
2952         XExposeEvent *e = &ev->xexpose;
2953
2954         if(xw.state & WIN_REDRAW) {
2955                 if(!e->count)
2956                         xw.state &= ~WIN_REDRAW;
2957         }
2958         redraw(0);
2959 }
2960
2961 void
2962 visibility(XEvent *ev) {
2963         XVisibilityEvent *e = &ev->xvisibility;
2964
2965         if(e->state == VisibilityFullyObscured) {
2966                 xw.state &= ~WIN_VISIBLE;
2967         } else if(!(xw.state & WIN_VISIBLE)) {
2968                 /* need a full redraw for next Expose, not just a buf copy */
2969                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2970         }
2971 }
2972
2973 void
2974 unmap(XEvent *ev) {
2975         xw.state &= ~WIN_VISIBLE;
2976 }
2977
2978 void
2979 xseturgency(int add) {
2980         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2981
2982         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2983         XSetWMHints(xw.dpy, xw.win, h);
2984         XFree(h);
2985 }
2986
2987 void
2988 focus(XEvent *ev) {
2989         if(ev->type == FocusIn) {
2990                 XSetICFocus(xw.xic);
2991                 xw.state |= WIN_FOCUSED;
2992                 xseturgency(0);
2993         } else {
2994                 XUnsetICFocus(xw.xic);
2995                 xw.state &= ~WIN_FOCUSED;
2996         }
2997 }
2998
2999 inline bool
3000 match(uint mask, uint state) {
3001         if(mask == XK_NO_MOD && state)
3002                 return false;
3003         if(mask != XK_ANY_MOD && mask != XK_NO_MOD && !state)
3004                 return false;
3005         if((state & mask) != state)
3006                 return false;
3007         return true;
3008 }
3009
3010 void
3011 numlock(const Arg *dummy) {
3012         term.numlock ^= 1;
3013 }
3014
3015 char*
3016 kmap(KeySym k, uint state) {
3017         uint mask;
3018         Key *kp;
3019         int i;
3020
3021         /* Check for mapped keys out of X11 function keys. */
3022         for(i = 0; i < LEN(mappedkeys); i++) {
3023                 if(mappedkeys[i] == k)
3024                         break;
3025         }
3026         if(i == LEN(mappedkeys)) {
3027                 if((k & 0xFFFF) < 0xFD00)
3028                         return NULL;
3029         }
3030
3031         for(kp = key; kp < key + LEN(key); kp++) {
3032                 mask = kp->mask;
3033
3034                 if(kp->k != k)
3035                         continue;
3036
3037                 if(!match(mask, state))
3038                         continue;
3039
3040                 if(kp->appkey > 0) {
3041                         if(!IS_SET(MODE_APPKEYPAD))
3042                                 continue;
3043                         if(term.numlock && kp->appkey == 2)
3044                                 continue;
3045                 } else if(kp->appkey < 0 && IS_SET(MODE_APPKEYPAD)) {
3046                         continue;
3047                 }
3048
3049                 if((kp->appcursor < 0 && IS_SET(MODE_APPCURSOR)) ||
3050                                 (kp->appcursor > 0
3051                                  && !IS_SET(MODE_APPCURSOR))) {
3052                         continue;
3053                 }
3054
3055                 if((kp->crlf < 0 && IS_SET(MODE_CRLF)) ||
3056                                 (kp->crlf > 0 && !IS_SET(MODE_CRLF))) {
3057                         continue;
3058                 }
3059
3060                 return kp->s;
3061         }
3062
3063         return NULL;
3064 }
3065
3066 void
3067 kpress(XEvent *ev) {
3068         XKeyEvent *e = &ev->xkey;
3069         KeySym ksym;
3070         char xstr[31], buf[32], *customkey, *cp = buf;
3071         int len;
3072         Status status;
3073         Shortcut *bp;
3074
3075         if (IS_SET(MODE_KBDLOCK))
3076                 return;
3077
3078         len = XmbLookupString(xw.xic, e, xstr, sizeof(xstr), &ksym, &status);
3079         e->state &= ~Mod2Mask;
3080         /* 1. shortcuts */
3081         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3082                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3083                         bp->func(&(bp->arg));
3084                         return;
3085                 }
3086         }
3087
3088         /* 2. custom keys from config.h */
3089         if((customkey = kmap(ksym, e->state))) {
3090                 len = strlen(customkey);
3091                 memcpy(buf, customkey, len);
3092         /* 2. hardcoded (overrides X lookup) */
3093         } else {
3094                 if(len == 0)
3095                         return;
3096
3097                 if (len == 1 && e->state & Mod1Mask)
3098                         *cp++ = '\033';
3099
3100                 memcpy(cp, xstr, len);
3101                 len = cp - buf + len;
3102         }
3103
3104         ttywrite(buf, len);
3105         if(IS_SET(MODE_ECHO))
3106                 techo(buf, len);
3107 }
3108
3109
3110 void
3111 cmessage(XEvent *e) {
3112         /* See xembed specs
3113            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
3114         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3115                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3116                         xw.state |= WIN_FOCUSED;
3117                         xseturgency(0);
3118                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3119                         xw.state &= ~WIN_FOCUSED;
3120                 }
3121         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3122                 /* Send SIGHUP to shell */
3123                 kill(pid, SIGHUP);
3124                 exit(EXIT_SUCCESS);
3125         }
3126 }
3127
3128 void
3129 cresize(int width, int height)
3130 {
3131         int col, row;
3132
3133         if(width != 0)
3134                 xw.w = width;
3135         if(height != 0)
3136                 xw.h = height;
3137
3138         col = (xw.w - 2 * borderpx) / xw.cw;
3139         row = (xw.h - 2 * borderpx) / xw.ch;
3140
3141         tresize(col, row);
3142         xresize(col, row);
3143         ttyresize();
3144 }
3145
3146 void
3147 resize(XEvent *e) {
3148         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3149                 return;
3150
3151         cresize(e->xconfigure.width, e->xconfigure.height);
3152 }
3153
3154 void
3155 run(void) {
3156         XEvent ev;
3157         fd_set rfd;
3158         int xfd = XConnectionNumber(xw.dpy), i;
3159         struct timeval drawtimeout, *tv = NULL;
3160
3161         for(i = 0;; i++) {
3162                 FD_ZERO(&rfd);
3163                 FD_SET(cmdfd, &rfd);
3164                 FD_SET(xfd, &rfd);
3165                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3166                         if(errno == EINTR)
3167                                 continue;
3168                         die("select failed: %s\n", SERRNO);
3169                 }
3170
3171                 /*
3172                  * Stop after a certain number of reads so the user does not
3173                  * feel like the system is stuttering.
3174                  */
3175                 if(i < 1000 && FD_ISSET(cmdfd, &rfd)) {
3176                         ttyread();
3177
3178                         /*
3179                          * Just wait a bit so it isn't disturbing the
3180                          * user and the system is able to write something.
3181                          */
3182                         drawtimeout.tv_sec = 0;
3183                         drawtimeout.tv_usec = 5;
3184                         tv = &drawtimeout;
3185                         continue;
3186                 }
3187                 i = 0;
3188                 tv = NULL;
3189
3190                 while(XPending(xw.dpy)) {
3191                         XNextEvent(xw.dpy, &ev);
3192                         if(XFilterEvent(&ev, None))
3193                                 continue;
3194                         if(handler[ev.type])
3195                                 (handler[ev.type])(&ev);
3196                 }
3197
3198                 draw();
3199                 XFlush(xw.dpy);
3200         }
3201 }
3202
3203 int
3204 main(int argc, char *argv[]) {
3205         int i, bitm, xr, yr;
3206         uint wr, hr;
3207
3208         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3209         xw.isfixed = False;
3210
3211         for(i = 1; i < argc; i++) {
3212                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
3213                 case 'c':
3214                         if(++i < argc)
3215                                 opt_class = argv[i];
3216                         break;
3217                 case 'e':
3218                         /* eat all remaining arguments */
3219                         if(++i < argc)
3220                                 opt_cmd = &argv[i];
3221                         goto run;
3222                 case 'f':
3223                         if(++i < argc)
3224                                 opt_font = argv[i];
3225                         break;
3226                 case 'g':
3227                         if(++i >= argc)
3228                                 break;
3229
3230                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
3231                         if(bitm & XValue)
3232                                 xw.fx = xr;
3233                         if(bitm & YValue)
3234                                 xw.fy = yr;
3235                         if(bitm & WidthValue)
3236                                 xw.fw = (int)wr;
3237                         if(bitm & HeightValue)
3238                                 xw.fh = (int)hr;
3239                         if(bitm & XNegative && xw.fx == 0)
3240                                 xw.fx = -1;
3241                         if(bitm & XNegative && xw.fy == 0)
3242                                 xw.fy = -1;
3243
3244                         if(xw.fh != 0 && xw.fw != 0)
3245                                 xw.isfixed = True;
3246                         break;
3247                 case 'o':
3248                         if(++i < argc)
3249                                 opt_io = argv[i];
3250                         break;
3251                 case 't':
3252                         if(++i < argc)
3253                                 opt_title = argv[i];
3254                         break;
3255                 case 'v':
3256                 default:
3257                         die(USAGE);
3258                 case 'w':
3259                         if(++i < argc)
3260                                 opt_embed = argv[i];
3261                         break;
3262                 }
3263         }
3264
3265 run:
3266         setlocale(LC_CTYPE, "");
3267         XSetLocaleModifiers("");
3268         tnew(80, 24);
3269         xinit();
3270         ttynew();
3271         selinit();
3272         run();
3273
3274         return 0;
3275 }
3276