st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  80 #define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
  81 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  82
  83 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  84 #define IS_TRUECOL(x)    (1 << 24 & (x))
  85 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  86 #define TRUEGREEN(x)     (((x) & 0xff00))
  87 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  88
  89
  90 #define VT102ID "\033[?6c"
  91
  92 enum glyph_attribute {
  93         ATTR_NULL      = 0,
  94         ATTR_REVERSE   = 1,
  95         ATTR_UNDERLINE = 2,
  96         ATTR_BOLD      = 4,
  97         ATTR_GFX       = 8,
  98         ATTR_ITALIC    = 16,
  99         ATTR_BLINK     = 32,
 100         ATTR_WRAP      = 64,
 101         ATTR_WIDE      = 128,
 102         ATTR_WDUMMY    = 256,
 103 };
 104
 105 enum cursor_movement {
 106         CURSOR_SAVE,
 107         CURSOR_LOAD
 108 };
 109
 110 enum cursor_state {
 111         CURSOR_DEFAULT  = 0,
 112         CURSOR_WRAPNEXT = 1,
 113         CURSOR_ORIGIN   = 2
 114 };
 115
 116 enum term_mode {
 117         MODE_WRAP        = 1,
 118         MODE_INSERT      = 2,
 119         MODE_APPKEYPAD   = 4,
 120         MODE_ALTSCREEN   = 8,
 121         MODE_CRLF        = 16,
 122         MODE_MOUSEBTN    = 32,
 123         MODE_MOUSEMOTION = 64,
 124         MODE_REVERSE     = 128,
 125         MODE_KBDLOCK     = 256,
 126         MODE_HIDE        = 512,
 127         MODE_ECHO        = 1024,
 128         MODE_APPCURSOR   = 2048,
 129         MODE_MOUSESGR    = 4096,
 130         MODE_8BIT        = 8192,
 131         MODE_BLINK       = 16384,
 132         MODE_FBLINK      = 32768,
 133         MODE_FOCUS       = 65536,
 134         MODE_MOUSEX10    = 131072,
 135         MODE_MOUSEMANY   = 262144,
 136         MODE_BRCKTPASTE  = 524288,
 137         MODE_PRINT       = 1048576,
 138         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 139                           |MODE_MOUSEMANY,
 140 };
 141
 142 enum charset {
 143         CS_GRAPHIC0,
 144         CS_GRAPHIC1,
 145         CS_UK,
 146         CS_USA,
 147         CS_MULTI,
 148         CS_GER,
 149         CS_FIN
 150 };
 151
 152 enum escape_state {
 153         ESC_START      = 1,
 154         ESC_CSI        = 2,
 155         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 156         ESC_ALTCHARSET = 8,
 157         ESC_STR_END    = 16, /* a final string was encountered */
 158         ESC_TEST       = 32, /* Enter in test mode */
 159 };
 160
 161 enum window_state {
 162         WIN_VISIBLE = 1,
 163         WIN_REDRAW  = 2,
 164         WIN_FOCUSED = 4
 165 };
 166
 167 enum selection_type {
 168         SEL_REGULAR = 1,
 169         SEL_RECTANGULAR = 2
 170 };
 171
 172 enum selection_snap {
 173         SNAP_WORD = 1,
 174         SNAP_LINE = 2
 175 };
 176
 177 typedef unsigned char uchar;
 178 typedef unsigned int uint;
 179 typedef unsigned long ulong;
 180 typedef unsigned short ushort;
 181
 182 typedef XftDraw *Draw;
 183 typedef XftColor Colour;
 184 typedef Colormap Colourmap;
 185
 186 typedef struct {
 187         char c[UTF_SIZ]; /* character code */
 188         ushort mode;      /* attribute flags */
 189         uint32_t fg;      /* foreground  */
 190         uint32_t bg;      /* background  */
 191 } Glyph;
 192
 193 typedef Glyph *Line;
 194
 195 typedef struct {
 196         Glyph attr; /* current char attributes */
 197         int x;
 198         int y;
 199         char state;
 200 } TCursor;
 201
 202 /* CSI Escape sequence structs */
 203 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 204 typedef struct {
 205         char buf[ESC_BUF_SIZ]; /* raw string */
 206         int len;               /* raw string length */
 207         char priv;
 208         int arg[ESC_ARG_SIZ];
 209         int narg;              /* nb of args */
 210         char mode;
 211 } CSIEscape;
 212
 213 /* STR Escape sequence structs */
 214 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 215 typedef struct {
 216         char type;             /* ESC type ... */
 217         char buf[STR_BUF_SIZ]; /* raw string */
 218         int len;               /* raw string length */
 219         char *args[STR_ARG_SIZ];
 220         int narg;              /* nb of args */
 221 } STREscape;
 222
 223 /* Internal representation of the screen */
 224 typedef struct {
 225         int row;      /* nb row */
 226         int col;      /* nb col */
 227         Line *line;   /* screen */
 228         Line *alt;    /* alternate screen */
 229         bool *dirty;  /* dirtyness of lines */
 230         TCursor c;    /* cursor */
 231         int top;      /* top    scroll limit */
 232         int bot;      /* bottom scroll limit */
 233         int mode;     /* terminal mode flags */
 234         int esc;      /* escape state flags */
 235         char trantbl[4]; /* charset table translation */
 236         int charset;  /* current charset */
 237         int icharset; /* selected charset for sequence */
 238         bool numlock; /* lock numbers in keyboard */
 239         bool *tabs;
 240 } Term;
 241
 242 /* Purely graphic info */
 243 typedef struct {
 244         Display *dpy;
 245         Colourmap cmap;
 246         Window win;
 247         Drawable buf;
 248         Atom xembed, wmdeletewin, netwmname, netwmpid;
 249         XIM xim;
 250         XIC xic;
 251         Draw draw;
 252         Visual *vis;
 253         XSetWindowAttributes attrs;
 254         int scr;
 255         bool isfixed; /* is fixed geometry? */
 256         int l, t; /* left and top offset */
 257         int gm; /* geometry mask */
 258         int tw, th; /* tty width and height */
 259         int w, h; /* window width and height */
 260         int ch; /* char height */
 261         int cw; /* char width  */
 262         char state; /* focus, redraw, visible */
 263 } XWindow;
 264
 265 typedef struct {
 266         uint b;
 267         uint mask;
 268         char *s;
 269 } Mousekey;
 270
 271 typedef struct {
 272         KeySym k;
 273         uint mask;
 274         char *s;
 275         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 276         signed char appkey;    /* application keypad */
 277         signed char appcursor; /* application cursor */
 278         signed char crlf;      /* crlf mode          */
 279 } Key;
 280
 281 typedef struct {
 282         int mode;
 283         int type;
 284         int snap;
 285         /*
 286          * Selection variables:
 287          * nb – normalized coordinates of the beginning of the selection
 288          * ne – normalized coordinates of the end of the selection
 289          * ob – original coordinates of the beginning of the selection
 290          * oe – original coordinates of the end of the selection
 291          */
 292         struct {
 293                 int x, y;
 294         } nb, ne, ob, oe;
 295
 296         char *clip;
 297         Atom xtarget;
 298         bool alt;
 299         struct timeval tclick1;
 300         struct timeval tclick2;
 301 } Selection;
 302
 303 typedef union {
 304         int i;
 305         uint ui;
 306         float f;
 307         const void *v;
 308 } Arg;
 309
 310 typedef struct {
 311         uint mod;
 312         KeySym keysym;
 313         void (*func)(const Arg *);
 314         const Arg arg;
 315 } Shortcut;
 316
 317 /* function definitions used in config.h */
 318 static void clippaste(const Arg *);
 319 static void numlock(const Arg *);
 320 static void selpaste(const Arg *);
 321 static void xzoom(const Arg *);
 322 static void printsel(const Arg *);
 323 static void printscreen(const Arg *) ;
 324 static void toggleprinter(const Arg *);
 325
 326 /* Config.h for applying patches and the configuration. */
 327 #include "config.h"
 328
 329 /* Font structure */
 330 typedef struct {
 331         int height;
 332         int width;
 333         int ascent;
 334         int descent;
 335         short lbearing;
 336         short rbearing;
 337         XftFont *match;
 338         FcFontSet *set;
 339         FcPattern *pattern;
 340 } Font;
 341
 342 /* Drawing Context */
 343 typedef struct {
 344         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 345         Font font, bfont, ifont, ibfont;
 346         GC gc;
 347 } DC;
 348
 349 static void die(const char *, ...);
 350 static void draw(void);
 351 static void redraw(int);
 352 static void drawregion(int, int, int, int);
 353 static void execsh(void);
 354 static void sigchld(int);
 355 static void run(void);
 356
 357 static void csidump(void);
 358 static void csihandle(void);
 359 static void csiparse(void);
 360 static void csireset(void);
 361 static void strdump(void);
 362 static void strhandle(void);
 363 static void strparse(void);
 364 static void strreset(void);
 365
 366 static int tattrset(int);
 367 static void tprinter(char *, size_t);
 368 static void tdumpsel(void);
 369 static void tdumpline(int);
 370 static void tdump(void);
 371 static void tclearregion(int, int, int, int);
 372 static void tcursor(int);
 373 static void tdeletechar(int);
 374 static void tdeleteline(int);
 375 static void tinsertblank(int);
 376 static void tinsertblankline(int);
 377 static void tmoveto(int, int);
 378 static void tmoveato(int, int);
 379 static void tnew(int, int);
 380 static void tnewline(int);
 381 static void tputtab(int);
 382 static void tputc(char *, int);
 383 static void treset(void);
 384 static int tresize(int, int);
 385 static void tscrollup(int, int);
 386 static void tscrolldown(int, int);
 387 static void tsetattr(int *, int);
 388 static void tsetchar(char *, Glyph *, int, int);
 389 static void tsetscroll(int, int);
 390 static void tswapscreen(void);
 391 static void tsetdirt(int, int);
 392 static void tsetdirtattr(int);
 393 static void tsetmode(bool, bool, int *, int);
 394 static void tfulldirt(void);
 395 static void techo(char *, int);
 396 static bool tcontrolcode(uchar );
 397 static void tdectest(char );
 398 static int32_t tdefcolor(int *, int *, int);
 399 static void tselcs(void);
 400 static void tdeftran(char);
 401 static inline bool match(uint, uint);
 402 static void dump(char c);
 403 static void ttynew(void);
 404 static void ttyread(void);
 405 static void ttyresize(void);
 406 static void ttysend(char *, size_t);
 407 static void ttywrite(const char *, size_t);
 408
 409 static void xdraws(char *, Glyph, int, int, int, int);
 410 static void xhints(void);
 411 static void xclear(int, int, int, int);
 412 static void xdrawcursor(void);
 413 static void xinit(void);
 414 static void xloadcols(void);
 415 static int xsetcolorname(int, const char *);
 416 static int xgeommasktogravity(int);
 417 static int xloadfont(Font *, FcPattern *);
 418 static void xloadfonts(char *, double);
 419 static int xloadfontset(Font *);
 420 static void xsettitle(char *);
 421 static void xresettitle(void);
 422 static void xsetpointermotion(int);
 423 static void xseturgency(int);
 424 static void xsetsel(char *);
 425 static void xtermclear(int, int, int, int);
 426 static void xunloadfont(Font *);
 427 static void xunloadfonts(void);
 428 static void xresize(int, int);
 429
 430 static void expose(XEvent *);
 431 static void visibility(XEvent *);
 432 static void unmap(XEvent *);
 433 static char *kmap(KeySym, uint);
 434 static void kpress(XEvent *);
 435 static void cmessage(XEvent *);
 436 static void cresize(int, int);
 437 static void resize(XEvent *);
 438 static void focus(XEvent *);
 439 static void brelease(XEvent *);
 440 static void bpress(XEvent *);
 441 static void bmotion(XEvent *);
 442 static void selnotify(XEvent *);
 443 static void selclear(XEvent *);
 444 static void selrequest(XEvent *);
 445
 446 static void selinit(void);
 447 static void selsort(void);
 448 static inline bool selected(int, int);
 449 static char *getsel(void);
 450 static void selcopy(void);
 451 static void selscroll(int, int);
 452 static void selsnap(int, int *, int *, int);
 453 static void getbuttoninfo(XEvent *);
 454 static void mousereport(XEvent *);
 455
 456 static size_t utf8decode(char *, long *, size_t);
 457 static long utf8decodebyte(char, size_t *);
 458 static size_t utf8encode(long, char *, size_t);
 459 static char utf8encodebyte(long, size_t);
 460 static size_t utf8len(char *);
 461 static size_t utf8validate(long *, size_t);
 462
 463 static ssize_t xwrite(int, const char *, size_t);
 464 static void *xmalloc(size_t);
 465 static void *xrealloc(void *, size_t);
 466 static char *xstrdup(char *);
 467
 468 static void usage(void);
 469
 470 static void (*handler[LASTEvent])(XEvent *) = {
 471         [KeyPress] = kpress,
 472         [ClientMessage] = cmessage,
 473         [ConfigureNotify] = resize,
 474         [VisibilityNotify] = visibility,
 475         [UnmapNotify] = unmap,
 476         [Expose] = expose,
 477         [FocusIn] = focus,
 478         [FocusOut] = focus,
 479         [MotionNotify] = bmotion,
 480         [ButtonPress] = bpress,
 481         [ButtonRelease] = brelease,
 482         [SelectionClear] = selclear,
 483         [SelectionNotify] = selnotify,
 484         [SelectionRequest] = selrequest,
 485 };
 486
 487 /* Globals */
 488 static DC dc;
 489 static XWindow xw;
 490 static Term term;
 491 static CSIEscape csiescseq;
 492 static STREscape strescseq;
 493 static int cmdfd;
 494 static pid_t pid;
 495 static Selection sel;
 496 static int iofd = STDOUT_FILENO;
 497 static char **opt_cmd = NULL;
 498 static char *opt_io = NULL;
 499 static char *opt_title = NULL;
 500 static char *opt_embed = NULL;
 501 static char *opt_class = NULL;
 502 static char *opt_font = NULL;
 503 static int oldbutton = 3; /* button event on startup: 3 = release */
 504
 505 static char *usedfont = NULL;
 506 static double usedfontsize = 0;
 507
 508 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 509 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 510 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 511 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 512
 513 /* Font Ring Cache */
 514 enum {
 515         FRC_NORMAL,
 516         FRC_ITALIC,
 517         FRC_BOLD,
 518         FRC_ITALICBOLD
 519 };
 520
 521 typedef struct {
 522         XftFont *font;
 523         int flags;
 524 } Fontcache;
 525
 526 /* Fontcache is an array now. A new font will be appended to the array. */
 527 static Fontcache frc[16];
 528 static int frclen = 0;
 529
 530 ssize_t
 531 xwrite(int fd, const char *s, size_t len) {
 532         size_t aux = len;
 533
 534         while(len > 0) {
 535                 ssize_t r = write(fd, s, len);
 536                 if(r < 0)
 537                         return r;
 538                 len -= r;
 539                 s += r;
 540         }
 541         return aux;
 542 }
 543
 544 void *
 545 xmalloc(size_t len) {
 546         void *p = malloc(len);
 547
 548         if(!p)
 549                 die("Out of memory\n");
 550
 551         return p;
 552 }
 553
 554 void *
 555 xrealloc(void *p, size_t len) {
 556         if((p = realloc(p, len)) == NULL)
 557                 die("Out of memory\n");
 558
 559         return p;
 560 }
 561
 562 char *
 563 xstrdup(char *s) {
 564         if((s = strdup(s)) == NULL)
 565                 die("Out of memory\n");
 566
 567         return s;
 568 }
 569
 570 size_t
 571 utf8decode(char *c, long *u, size_t clen) {
 572         size_t i, j, len, type;
 573         long udecoded;
 574
 575         *u = UTF_INVALID;
 576         if(!clen)
 577                 return 0;
 578         udecoded = utf8decodebyte(c[0], &len);
 579         if(!BETWEEN(len, 1, UTF_SIZ))
 580                 return 1;
 581         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 582                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 583                 if(type != 0)
 584                         return j;
 585         }
 586         if(j < len)
 587                 return 0;
 588         *u = udecoded;
 589         utf8validate(u, len);
 590         return len;
 591 }
 592
 593 long
 594 utf8decodebyte(char c, size_t *i) {
 595         for(*i = 0; *i < LEN(utfmask); ++(*i))
 596                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 597                         return (uchar)c & ~utfmask[*i];
 598         return 0;
 599 }
 600
 601 size_t
 602 utf8encode(long u, char *c, size_t clen) {
 603         size_t len, i;
 604
 605         len = utf8validate(&u, 0);
 606         if(clen < len)
 607                 return 0;
 608         for(i = len - 1; i != 0; --i) {
 609                 c[i] = utf8encodebyte(u, 0);
 610                 u >>= 6;
 611         }
 612         c[0] = utf8encodebyte(u, len);
 613         return len;
 614 }
 615
 616 char
 617 utf8encodebyte(long u, size_t i) {
 618         return utfbyte[i] | (u & ~utfmask[i]);
 619 }
 620
 621 size_t
 622 utf8len(char *c) {
 623         return utf8decode(c, &(long){0}, UTF_SIZ);
 624 }
 625
 626 size_t
 627 utf8validate(long *u, size_t i) {
 628         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 629                 *u = UTF_INVALID;
 630         for(i = 1; *u > utfmax[i]; ++i)
 631                 ;
 632         return i;
 633 }
 634
 635 static void
 636 selinit(void) {
 637         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 638         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 639         sel.mode = 0;
 640         sel.ob.x = -1;
 641         sel.clip = NULL;
 642         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 643         if(sel.xtarget == None)
 644                 sel.xtarget = XA_STRING;
 645 }
 646
 647 static int
 648 x2col(int x) {
 649         x -= borderpx;
 650         x /= xw.cw;
 651
 652         return LIMIT(x, 0, term.col-1);
 653 }
 654
 655 static int
 656 y2row(int y) {
 657         y -= borderpx;
 658         y /= xw.ch;
 659
 660         return LIMIT(y, 0, term.row-1);
 661 }
 662
 663 static void
 664 selsort(void) {
 665         if(sel.ob.y == sel.oe.y) {
 666                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 667                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 668         } else {
 669                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 670                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 671         }
 672         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 673         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 674 }
 675
 676 static inline bool
 677 selected(int x, int y) {
 678         if(sel.ne.y == y && sel.nb.y == y)
 679                 return BETWEEN(x, sel.nb.x, sel.ne.x);
 680
 681         if(sel.type == SEL_RECTANGULAR) {
 682                 return ((sel.nb.y <= y && y <= sel.ne.y)
 683                         && (sel.nb.x <= x && x <= sel.ne.x));
 684         }
 685
 686         return ((sel.nb.y < y && y < sel.ne.y)
 687                 || (y == sel.ne.y && x <= sel.ne.x))
 688                 || (y == sel.nb.y && x >= sel.nb.x
 689                         && (x <= sel.ne.x || sel.nb.y != sel.ne.y));
 690 }
 691
 692 void
 693 selsnap(int mode, int *x, int *y, int direction) {
 694         int i;
 695
 696         switch(mode) {
 697         case SNAP_WORD:
 698                 /*
 699                  * Snap around if the word wraps around at the end or
 700                  * beginning of a line.
 701                  */
 702                 for(;;) {
 703                         if(direction < 0 && *x <= 0) {
 704                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 705                                                 & ATTR_WRAP) {
 706                                         *y -= 1;
 707                                         *x = term.col-1;
 708                                 } else {
 709                                         break;
 710                                 }
 711                         }
 712                         if(direction > 0 && *x >= term.col-1) {
 713                                 if(*y < term.row-1 && term.line[*y][*x].mode
 714                                                 & ATTR_WRAP) {
 715                                         *y += 1;
 716                                         *x = 0;
 717                                 } else {
 718                                         break;
 719                                 }
 720                         }
 721
 722                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 723                                 *x += direction;
 724                                 continue;
 725                         }
 726
 727                         if(strchr(worddelimiters,
 728                                         term.line[*y][*x+direction].c[0])) {
 729                                 break;
 730                         }
 731
 732                         *x += direction;
 733                 }
 734                 break;
 735         case SNAP_LINE:
 736                 /*
 737                  * Snap around if the the previous line or the current one
 738                  * has set ATTR_WRAP at its end. Then the whole next or
 739                  * previous line will be selected.
 740                  */
 741                 *x = (direction < 0) ? 0 : term.col - 1;
 742                 if(direction < 0 && *y > 0) {
 743                         for(; *y > 0; *y += direction) {
 744                                 if(!(term.line[*y-1][term.col-1].mode
 745                                                 & ATTR_WRAP)) {
 746                                         break;
 747                                 }
 748                         }
 749                 } else if(direction > 0 && *y < term.row-1) {
 750                         for(; *y < term.row; *y += direction) {
 751                                 if(!(term.line[*y][term.col-1].mode
 752                                                 & ATTR_WRAP)) {
 753                                         break;
 754                                 }
 755                         }
 756                 }
 757                 break;
 758         default:
 759                 /*
 760                  * Select the whole line when the end of line is reached.
 761                  */
 762                 if(direction > 0) {
 763                         i = term.col;
 764                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 765                                 /* nothing */;
 766                         if(i > 0 && i < *x)
 767                                 *x = term.col - 1;
 768                 }
 769                 break;
 770         }
 771 }
 772
 773 void
 774 getbuttoninfo(XEvent *e) {
 775         int type;
 776         uint state = e->xbutton.state &~Button1Mask;
 777
 778         sel.alt = IS_SET(MODE_ALTSCREEN);
 779
 780         sel.oe.x = x2col(e->xbutton.x);
 781         sel.oe.y = y2row(e->xbutton.y);
 782
 783         if(sel.ob.y < sel.oe.y
 784                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 785                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 786                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 787         } else {
 788                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 789                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 790         }
 791         selsort();
 792
 793         sel.type = SEL_REGULAR;
 794         for(type = 1; type < LEN(selmasks); ++type) {
 795                 if(match(selmasks[type], state)) {
 796                         sel.type = type;
 797                         break;
 798                 }
 799         }
 800 }
 801
 802 void
 803 mousereport(XEvent *e) {
 804         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 805             button = e->xbutton.button, state = e->xbutton.state,
 806             len;
 807         char buf[40];
 808         static int ox, oy;
 809
 810         /* from urxvt */
 811         if(e->xbutton.type == MotionNotify) {
 812                 if(x == ox && y == oy)
 813                         return;
 814                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 815                         return;
 816                 /* MOUSE_MOTION: no reporting if no button is pressed */
 817                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 818                         return;
 819
 820                 button = oldbutton + 32;
 821                 ox = x;
 822                 oy = y;
 823         } else {
 824                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 825                         button = 3;
 826                 } else {
 827                         button -= Button1;
 828                         if(button >= 3)
 829                                 button += 64 - 3;
 830                 }
 831                 if(e->xbutton.type == ButtonPress) {
 832                         oldbutton = button;
 833                         ox = x;
 834                         oy = y;
 835                 } else if(e->xbutton.type == ButtonRelease) {
 836                         oldbutton = 3;
 837                         /* MODE_MOUSEX10: no button release reporting */
 838                         if(IS_SET(MODE_MOUSEX10))
 839                                 return;
 840                 }
 841         }
 842
 843         if(!IS_SET(MODE_MOUSEX10)) {
 844                 button += (state & ShiftMask   ? 4  : 0)
 845                         + (state & Mod4Mask    ? 8  : 0)
 846                         + (state & ControlMask ? 16 : 0);
 847         }
 848
 849         len = 0;
 850         if(IS_SET(MODE_MOUSESGR)) {
 851                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 852                                 button, x+1, y+1,
 853                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 854         } else if(x < 223 && y < 223) {
 855                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 856                                 32+button, 32+x+1, 32+y+1);
 857         } else {
 858                 return;
 859         }
 860
 861         ttywrite(buf, len);
 862 }
 863
 864 void
 865 bpress(XEvent *e) {
 866         struct timeval now;
 867         Mousekey *mk;
 868
 869         if(IS_SET(MODE_MOUSE)) {
 870                 mousereport(e);
 871                 return;
 872         }
 873
 874         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 875                 if(e->xbutton.button == mk->b
 876                                 && match(mk->mask, e->xbutton.state)) {
 877                         ttysend(mk->s, strlen(mk->s));
 878                         return;
 879                 }
 880         }
 881
 882         if(e->xbutton.button == Button1) {
 883                 gettimeofday(&now, NULL);
 884
 885                 /* Clear previous selection, logically and visually. */
 886                 selclear(NULL);
 887                 sel.mode = 1;
 888                 sel.type = SEL_REGULAR;
 889                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 890                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 891
 892                 /*
 893                  * If the user clicks below predefined timeouts specific
 894                  * snapping behaviour is exposed.
 895                  */
 896                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 897                         sel.snap = SNAP_LINE;
 898                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 899                         sel.snap = SNAP_WORD;
 900                 } else {
 901                         sel.snap = 0;
 902                 }
 903                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 904                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 905                 selsort();
 906
 907                 /*
 908                  * Draw selection, unless it's regular and we don't want to
 909                  * make clicks visible
 910                  */
 911                 if(sel.snap != 0) {
 912                         sel.mode++;
 913                         tsetdirt(sel.nb.y, sel.ne.y);
 914                 }
 915                 sel.tclick2 = sel.tclick1;
 916                 sel.tclick1 = now;
 917         }
 918 }
 919
 920 char *
 921 getsel(void) {
 922         char *str, *ptr;
 923         int x, y, bufsize, size, i, ex;
 924         Glyph *gp, *last;
 925
 926         if(sel.ob.x == -1) {
 927                 str = NULL;
 928         } else {
 929                 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 930                 ptr = str = xmalloc(bufsize);
 931
 932                 /* append every set & selected glyph to the selection */
 933                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 934                         gp = &term.line[y][0];
 935                         last = &gp[term.col-1];
 936
 937                         while(last >= gp && !(selected(last - gp, y) &&
 938                                               strcmp(last->c, " ") != 0)) {
 939                                 --last;
 940                         }
 941
 942                         for(x = 0; gp <= last; x++, ++gp) {
 943                                 if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 944                                         continue;
 945
 946                                 size = utf8len(gp->c);
 947                                 memcpy(ptr, gp->c, size);
 948                                 ptr += size;
 949                         }
 950
 951                         /*
 952                          * Copy and pasting of line endings is inconsistent
 953                          * in the inconsistent terminal and GUI world.
 954                          * The best solution seems like to produce '\n' when
 955                          * something is copied from st and convert '\n' to
 956                          * '\r', when something to be pasted is received by
 957                          * st.
 958                          * FIXME: Fix the computer world.
 959                          */
 960                         if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
 961                                 *ptr++ = '\n';
 962
 963                         /*
 964                          * If the last selected line expands in the selection
 965                          * after the visible text '\n' is appended.
 966                          */
 967                         if(y == sel.ne.y) {
 968                                 i = term.col;
 969                                 while(--i > 0 && term.line[y][i].c[0] == ' ')
 970                                         /* nothing */;
 971                                 ex = sel.ne.x;
 972                                 if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 973                                         ex = sel.nb.x;
 974                                 if(i < ex)
 975                                         *ptr++ = '\n';
 976                         }
 977                 }
 978                 *ptr = 0;
 979         }
 980         return str;
 981 }
 982
 983 void
 984 selcopy(void) {
 985         xsetsel(getsel());
 986 }
 987
 988 void
 989 selnotify(XEvent *e) {
 990         ulong nitems, ofs, rem;
 991         int format;
 992         uchar *data, *last, *repl;
 993         Atom type;
 994
 995         ofs = 0;
 996         do {
 997                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 998                                         False, AnyPropertyType, &type, &format,
 999                                         &nitems, &rem, &data)) {
1000                         fprintf(stderr, "Clipboard allocation failed\n");
1001                         return;
1002                 }
1003
1004                 /*
1005                  * As seen in getsel:
1006                  * Line endings are inconsistent in the terminal and GUI world
1007                  * copy and pasting. When receiving some selection data,
1008                  * replace all '\n' with '\r'.
1009                  * FIXME: Fix the computer world.
1010                  */
1011                 repl = data;
1012                 last = data + nitems * format / 8;
1013                 while((repl = memchr(repl, '\n', last - repl))) {
1014                         *repl++ = '\r';
1015                 }
1016
1017                 if(IS_SET(MODE_BRCKTPASTE))
1018                         ttywrite("\033[200~", 6);
1019                 ttysend((char *)data, nitems * format / 8);
1020                 if(IS_SET(MODE_BRCKTPASTE))
1021                         ttywrite("\033[201~", 6);
1022                 XFree(data);
1023                 /* number of 32-bit chunks returned */
1024                 ofs += nitems * format / 32;
1025         } while(rem > 0);
1026 }
1027
1028 void
1029 selpaste(const Arg *dummy) {
1030         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1031                         xw.win, CurrentTime);
1032 }
1033
1034 void
1035 clippaste(const Arg *dummy) {
1036         Atom clipboard;
1037
1038         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1039         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1040                         xw.win, CurrentTime);
1041 }
1042
1043 void
1044 selclear(XEvent *e) {
1045         if(sel.ob.x == -1)
1046                 return;
1047         sel.ob.x = -1;
1048         tsetdirt(sel.nb.y, sel.ne.y);
1049 }
1050
1051 void
1052 selrequest(XEvent *e) {
1053         XSelectionRequestEvent *xsre;
1054         XSelectionEvent xev;
1055         Atom xa_targets, string;
1056
1057         xsre = (XSelectionRequestEvent *) e;
1058         xev.type = SelectionNotify;
1059         xev.requestor = xsre->requestor;
1060         xev.selection = xsre->selection;
1061         xev.target = xsre->target;
1062         xev.time = xsre->time;
1063         /* reject */
1064         xev.property = None;
1065
1066         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1067         if(xsre->target == xa_targets) {
1068                 /* respond with the supported type */
1069                 string = sel.xtarget;
1070                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1071                                 XA_ATOM, 32, PropModeReplace,
1072                                 (uchar *) &string, 1);
1073                 xev.property = xsre->property;
1074         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1075                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1076                                 xsre->target, 8, PropModeReplace,
1077                                 (uchar *) sel.clip, strlen(sel.clip));
1078                 xev.property = xsre->property;
1079         }
1080
1081         /* all done, send a notification to the listener */
1082         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1083                 fprintf(stderr, "Error sending SelectionNotify event\n");
1084 }
1085
1086 void
1087 xsetsel(char *str) {
1088         /* register the selection for both the clipboard and the primary */
1089         Atom clipboard;
1090
1091         free(sel.clip);
1092         sel.clip = str;
1093
1094         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1095
1096         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1097         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1098 }
1099
1100 void
1101 brelease(XEvent *e) {
1102         if(IS_SET(MODE_MOUSE)) {
1103                 mousereport(e);
1104                 return;
1105         }
1106
1107         if(e->xbutton.button == Button2) {
1108                 selpaste(NULL);
1109         } else if(e->xbutton.button == Button1) {
1110                 if(sel.mode < 2) {
1111                         selclear(NULL);
1112                 } else {
1113                         getbuttoninfo(e);
1114                         selcopy();
1115                 }
1116                 sel.mode = 0;
1117                 tsetdirt(sel.nb.y, sel.ne.y);
1118         }
1119 }
1120
1121 void
1122 bmotion(XEvent *e) {
1123         int oldey, oldex, oldsby, oldsey;
1124
1125         if(IS_SET(MODE_MOUSE)) {
1126                 mousereport(e);
1127                 return;
1128         }
1129
1130         if(!sel.mode)
1131                 return;
1132
1133         sel.mode++;
1134         oldey = sel.oe.y;
1135         oldex = sel.oe.x;
1136         oldsby = sel.nb.y;
1137         oldsey = sel.ne.y;
1138         getbuttoninfo(e);
1139
1140         if(oldey != sel.oe.y || oldex != sel.oe.x)
1141                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1142 }
1143
1144 void
1145 die(const char *errstr, ...) {
1146         va_list ap;
1147
1148         va_start(ap, errstr);
1149         vfprintf(stderr, errstr, ap);
1150         va_end(ap);
1151         exit(EXIT_FAILURE);
1152 }
1153
1154 void
1155 execsh(void) {
1156         char **args;
1157         char *envshell = getenv("SHELL");
1158         const struct passwd *pass = getpwuid(getuid());
1159         char buf[sizeof(long) * 8 + 1];
1160
1161         unsetenv("COLUMNS");
1162         unsetenv("LINES");
1163         unsetenv("TERMCAP");
1164
1165         if(pass) {
1166                 setenv("LOGNAME", pass->pw_name, 1);
1167                 setenv("USER", pass->pw_name, 1);
1168                 setenv("SHELL", pass->pw_shell, 0);
1169                 setenv("HOME", pass->pw_dir, 0);
1170         }
1171
1172         snprintf(buf, sizeof(buf), "%lu", xw.win);
1173         setenv("WINDOWID", buf, 1);
1174
1175         signal(SIGCHLD, SIG_DFL);
1176         signal(SIGHUP, SIG_DFL);
1177         signal(SIGINT, SIG_DFL);
1178         signal(SIGQUIT, SIG_DFL);
1179         signal(SIGTERM, SIG_DFL);
1180         signal(SIGALRM, SIG_DFL);
1181
1182         DEFAULT(envshell, shell);
1183         setenv("TERM", termname, 1);
1184         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1185         execvp(args[0], args);
1186         exit(EXIT_FAILURE);
1187 }
1188
1189 void
1190 sigchld(int a) {
1191         int stat = 0;
1192
1193         if(waitpid(pid, &stat, 0) < 0)
1194                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1195
1196         if(WIFEXITED(stat)) {
1197                 exit(WEXITSTATUS(stat));
1198         } else {
1199                 exit(EXIT_FAILURE);
1200         }
1201 }
1202
1203 void
1204 ttynew(void) {
1205         int m, s;
1206         struct winsize w = {term.row, term.col, 0, 0};
1207
1208         /* seems to work fine on linux, openbsd and freebsd */
1209         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1210                 die("openpty failed: %s\n", strerror(errno));
1211
1212         switch(pid = fork()) {
1213         case -1:
1214                 die("fork failed\n");
1215                 break;
1216         case 0:
1217                 setsid(); /* create a new process group */
1218                 dup2(s, STDIN_FILENO);
1219                 dup2(s, STDOUT_FILENO);
1220                 dup2(s, STDERR_FILENO);
1221                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1222                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1223                 close(s);
1224                 close(m);
1225                 execsh();
1226                 break;
1227         default:
1228                 close(s);
1229                 cmdfd = m;
1230                 signal(SIGCHLD, sigchld);
1231                 if(opt_io) {
1232                         term.mode |= MODE_PRINT;
1233                         iofd = (!strcmp(opt_io, "-")) ?
1234                                   STDOUT_FILENO :
1235                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1236                         if(iofd < 0) {
1237                                 fprintf(stderr, "Error opening %s:%s\n",
1238                                         opt_io, strerror(errno));
1239                         }
1240                 }
1241                 break;
1242         }
1243 }
1244
1245 void
1246 dump(char c) {
1247         static int col;
1248
1249         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1250         if(++col % 10 == 0)
1251                 fprintf(stderr, "\n");
1252 }
1253
1254 void
1255 ttyread(void) {
1256         static char buf[BUFSIZ];
1257         static int buflen = 0;
1258         char *ptr;
1259         char s[UTF_SIZ];
1260         int charsize; /* size of utf8 char in bytes */
1261         long unicodep;
1262         int ret;
1263
1264         /* append read bytes to unprocessed bytes */
1265         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1266                 die("Couldn't read from shell: %s\n", strerror(errno));
1267
1268         /* process every complete utf8 char */
1269         buflen += ret;
1270         ptr = buf;
1271         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1272                 utf8encode(unicodep, s, UTF_SIZ);
1273                 tputc(s, charsize);
1274                 ptr += charsize;
1275                 buflen -= charsize;
1276         }
1277
1278         /* keep any uncomplete utf8 char for the next call */
1279         memmove(buf, ptr, buflen);
1280 }
1281
1282 void
1283 ttywrite(const char *s, size_t n) {
1284         if(xwrite(cmdfd, s, n) == -1)
1285                 die("write error on tty: %s\n", strerror(errno));
1286 }
1287
1288 void
1289 ttysend(char *s, size_t n) {
1290         ttywrite(s, n);
1291         if(IS_SET(MODE_ECHO))
1292                 techo(s, n);
1293 }
1294
1295 void
1296 ttyresize(void) {
1297         struct winsize w;
1298
1299         w.ws_row = term.row;
1300         w.ws_col = term.col;
1301         w.ws_xpixel = xw.tw;
1302         w.ws_ypixel = xw.th;
1303         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1304                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1305 }
1306
1307 int
1308 tattrset(int attr) {
1309         int i, j;
1310
1311         for(i = 0; i < term.row-1; i++) {
1312                 for(j = 0; j < term.col-1; j++) {
1313                         if(term.line[i][j].mode & attr)
1314                                 return 1;
1315                 }
1316         }
1317
1318         return 0;
1319 }
1320
1321 void
1322 tsetdirt(int top, int bot) {
1323         int i;
1324
1325         LIMIT(top, 0, term.row-1);
1326         LIMIT(bot, 0, term.row-1);
1327
1328         for(i = top; i <= bot; i++)
1329                 term.dirty[i] = 1;
1330 }
1331
1332 void
1333 tsetdirtattr(int attr) {
1334         int i, j;
1335
1336         for(i = 0; i < term.row-1; i++) {
1337                 for(j = 0; j < term.col-1; j++) {
1338                         if(term.line[i][j].mode & attr) {
1339                                 tsetdirt(i, i);
1340                                 break;
1341                         }
1342                 }
1343         }
1344 }
1345
1346 void
1347 tfulldirt(void) {
1348         tsetdirt(0, term.row-1);
1349 }
1350
1351 void
1352 tcursor(int mode) {
1353         static TCursor c[2];
1354         bool alt = IS_SET(MODE_ALTSCREEN);
1355
1356         if(mode == CURSOR_SAVE) {
1357                 c[alt] = term.c;
1358         } else if(mode == CURSOR_LOAD) {
1359                 term.c = c[alt];
1360                 tmoveto(c[alt].x, c[alt].y);
1361         }
1362 }
1363
1364 void
1365 treset(void) {
1366         uint i;
1367
1368         term.c = (TCursor){{
1369                 .mode = ATTR_NULL,
1370                 .fg = defaultfg,
1371                 .bg = defaultbg
1372         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1373
1374         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1375         for(i = tabspaces; i < term.col; i += tabspaces)
1376                 term.tabs[i] = 1;
1377         term.top = 0;
1378         term.bot = term.row - 1;
1379         term.mode = MODE_WRAP;
1380         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1381         term.charset = 0;
1382
1383         tclearregion(0, 0, term.col-1, term.row-1);
1384         tmoveto(0, 0);
1385         tcursor(CURSOR_SAVE);
1386 }
1387
1388 void
1389 tnew(int col, int row) {
1390         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1391         tresize(col, row);
1392         term.numlock = 1;
1393
1394         treset();
1395 }
1396
1397 void
1398 tswapscreen(void) {
1399         Line *tmp = term.line;
1400
1401         term.line = term.alt;
1402         term.alt = tmp;
1403         term.mode ^= MODE_ALTSCREEN;
1404         tfulldirt();
1405 }
1406
1407 void
1408 tscrolldown(int orig, int n) {
1409         int i;
1410         Line temp;
1411
1412         LIMIT(n, 0, term.bot-orig+1);
1413
1414         tsetdirt(orig, term.bot-n);
1415         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1416
1417         for(i = term.bot; i >= orig+n; i--) {
1418                 temp = term.line[i];
1419                 term.line[i] = term.line[i-n];
1420                 term.line[i-n] = temp;
1421         }
1422
1423         selscroll(orig, n);
1424 }
1425
1426 void
1427 tscrollup(int orig, int n) {
1428         int i;
1429         Line temp;
1430
1431         LIMIT(n, 0, term.bot-orig+1);
1432
1433         tclearregion(0, orig, term.col-1, orig+n-1);
1434         tsetdirt(orig+n, term.bot);
1435
1436         for(i = orig; i <= term.bot-n; i++) {
1437                 temp = term.line[i];
1438                 term.line[i] = term.line[i+n];
1439                 term.line[i+n] = temp;
1440         }
1441
1442         selscroll(orig, -n);
1443 }
1444
1445 void
1446 selscroll(int orig, int n) {
1447         if(sel.ob.x == -1)
1448                 return;
1449
1450         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1451                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1452                         selclear(NULL);
1453                         return;
1454                 }
1455                 if(sel.type == SEL_RECTANGULAR) {
1456                         if(sel.ob.y < term.top)
1457                                 sel.ob.y = term.top;
1458                         if(sel.oe.y > term.bot)
1459                                 sel.oe.y = term.bot;
1460                 } else {
1461                         if(sel.ob.y < term.top) {
1462                                 sel.ob.y = term.top;
1463                                 sel.ob.x = 0;
1464                         }
1465                         if(sel.oe.y > term.bot) {
1466                                 sel.oe.y = term.bot;
1467                                 sel.oe.x = term.col;
1468                         }
1469                 }
1470                 selsort();
1471         }
1472 }
1473
1474 void
1475 tnewline(int first_col) {
1476         int y = term.c.y;
1477
1478         if(y == term.bot) {
1479                 tscrollup(term.top, 1);
1480         } else {
1481                 y++;
1482         }
1483         tmoveto(first_col ? 0 : term.c.x, y);
1484 }
1485
1486 void
1487 csiparse(void) {
1488         char *p = csiescseq.buf, *np;
1489         long int v;
1490
1491         csiescseq.narg = 0;
1492         if(*p == '?') {
1493                 csiescseq.priv = 1;
1494                 p++;
1495         }
1496
1497         csiescseq.buf[csiescseq.len] = '\0';
1498         while(p < csiescseq.buf+csiescseq.len) {
1499                 np = NULL;
1500                 v = strtol(p, &np, 10);
1501                 if(np == p)
1502                         v = 0;
1503                 if(v == LONG_MAX || v == LONG_MIN)
1504                         v = -1;
1505                 csiescseq.arg[csiescseq.narg++] = v;
1506                 p = np;
1507                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1508                         break;
1509                 p++;
1510         }
1511         csiescseq.mode = *p;
1512 }
1513
1514 /* for absolute user moves, when decom is set */
1515 void
1516 tmoveato(int x, int y) {
1517         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1518 }
1519
1520 void
1521 tmoveto(int x, int y) {
1522         int miny, maxy;
1523
1524         if(term.c.state & CURSOR_ORIGIN) {
1525                 miny = term.top;
1526                 maxy = term.bot;
1527         } else {
1528                 miny = 0;
1529                 maxy = term.row - 1;
1530         }
1531         LIMIT(x, 0, term.col-1);
1532         LIMIT(y, miny, maxy);
1533         term.c.state &= ~CURSOR_WRAPNEXT;
1534         term.c.x = x;
1535         term.c.y = y;
1536 }
1537
1538 void
1539 tsetchar(char *c, Glyph *attr, int x, int y) {
1540         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1541                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1542                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1543                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1544                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1545                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1546                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1547                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1548                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1549         };
1550
1551         /*
1552          * The table is proudly stolen from rxvt.
1553          */
1554         if(attr->mode & ATTR_GFX) {
1555                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1556                         c = vt100_0[c[0] - 0x41];
1557                 }
1558         }
1559
1560         if(term.line[y][x].mode & ATTR_WIDE) {
1561                 if(x+1 < term.col) {
1562                         term.line[y][x+1].c[0] = ' ';
1563                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1564                 }
1565         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1566                 term.line[y][x-1].c[0] = ' ';
1567                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1568         }
1569
1570         term.dirty[y] = 1;
1571         term.line[y][x] = *attr;
1572         memcpy(term.line[y][x].c, c, UTF_SIZ);
1573 }
1574
1575 void
1576 tclearregion(int x1, int y1, int x2, int y2) {
1577         int x, y, temp;
1578
1579         if(x1 > x2)
1580                 temp = x1, x1 = x2, x2 = temp;
1581         if(y1 > y2)
1582                 temp = y1, y1 = y2, y2 = temp;
1583
1584         LIMIT(x1, 0, term.col-1);
1585         LIMIT(x2, 0, term.col-1);
1586         LIMIT(y1, 0, term.row-1);
1587         LIMIT(y2, 0, term.row-1);
1588
1589         for(y = y1; y <= y2; y++) {
1590                 term.dirty[y] = 1;
1591                 for(x = x1; x <= x2; x++) {
1592                         if(selected(x, y))
1593                                 selclear(NULL);
1594                         term.line[y][x] = term.c.attr;
1595                         memcpy(term.line[y][x].c, " ", 2);
1596                 }
1597         }
1598 }
1599
1600 void
1601 tdeletechar(int n) {
1602         int dst, src, size;
1603         Glyph *line;
1604
1605         LIMIT(n, 0, term.col - term.c.x);
1606
1607         dst = term.c.x;
1608         src = term.c.x + n;
1609         size = term.col - src;
1610         line = term.line[term.c.y];
1611
1612         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1613         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1614 }
1615
1616 void
1617 tinsertblank(int n) {
1618         int dst, src, size;
1619         Glyph *line;
1620
1621         LIMIT(n, 0, term.col - term.c.x);
1622
1623         dst = term.c.x + n;
1624         src = term.c.x;
1625         size = term.col - dst;
1626         line = term.line[term.c.y];
1627
1628         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1629         tclearregion(src, term.c.y, dst - 1, term.c.y);
1630 }
1631
1632 void
1633 tinsertblankline(int n) {
1634         if(BETWEEN(term.c.y, term.top, term.bot))
1635                 tscrolldown(term.c.y, n);
1636 }
1637
1638 void
1639 tdeleteline(int n) {
1640         if(BETWEEN(term.c.y, term.top, term.bot))
1641                 tscrollup(term.c.y, n);
1642 }
1643
1644 int32_t
1645 tdefcolor(int *attr, int *npar, int l) {
1646         int32_t idx = -1;
1647         uint r, g, b;
1648
1649         switch (attr[*npar + 1]) {
1650         case 2: /* direct colour in RGB space */
1651                 if (*npar + 4 >= l) {
1652                         fprintf(stderr,
1653                                 "erresc(38): Incorrect number of parameters (%d)\n",
1654                                 *npar);
1655                         break;
1656                 }
1657                 r = attr[*npar + 2];
1658                 g = attr[*npar + 3];
1659                 b = attr[*npar + 4];
1660                 *npar += 4;
1661                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1662                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1663                                 r, g, b);
1664                 else
1665                         idx = TRUECOLOR(r, g, b);
1666                 break;
1667         case 5: /* indexed colour */
1668                 if (*npar + 2 >= l) {
1669                         fprintf(stderr,
1670                                 "erresc(38): Incorrect number of parameters (%d)\n",
1671                                 *npar);
1672                         break;
1673                 }
1674                 *npar += 2;
1675                 if(!BETWEEN(attr[*npar], 0, 255))
1676                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1677                 else
1678                         idx = attr[*npar];
1679                 break;
1680         case 0: /* implemented defined (only foreground) */
1681         case 1: /* transparent */
1682         case 3: /* direct colour in CMY space */
1683         case 4: /* direct colour in CMYK space */
1684         default:
1685                 fprintf(stderr,
1686                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1687                 break;
1688         }
1689
1690         return idx;
1691 }
1692
1693 void
1694 tsetattr(int *attr, int l) {
1695         int i;
1696         int32_t idx;
1697
1698         for(i = 0; i < l; i++) {
1699                 switch(attr[i]) {
1700                 case 0:
1701                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1702                                         | ATTR_BOLD | ATTR_ITALIC \
1703                                         | ATTR_BLINK);
1704                         term.c.attr.fg = defaultfg;
1705                         term.c.attr.bg = defaultbg;
1706                         break;
1707                 case 1:
1708                         term.c.attr.mode |= ATTR_BOLD;
1709                         break;
1710                 case 3:
1711                         term.c.attr.mode |= ATTR_ITALIC;
1712                         break;
1713                 case 4:
1714                         term.c.attr.mode |= ATTR_UNDERLINE;
1715                         break;
1716                 case 5: /* slow blink */
1717                 case 6: /* rapid blink */
1718                         term.c.attr.mode |= ATTR_BLINK;
1719                         break;
1720                 case 7:
1721                         term.c.attr.mode |= ATTR_REVERSE;
1722                         break;
1723                 case 21:
1724                 case 22:
1725                         term.c.attr.mode &= ~ATTR_BOLD;
1726                         break;
1727                 case 23:
1728                         term.c.attr.mode &= ~ATTR_ITALIC;
1729                         break;
1730                 case 24:
1731                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1732                         break;
1733                 case 25:
1734                 case 26:
1735                         term.c.attr.mode &= ~ATTR_BLINK;
1736                         break;
1737                 case 27:
1738                         term.c.attr.mode &= ~ATTR_REVERSE;
1739                         break;
1740                 case 38:
1741                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1742                                 term.c.attr.fg = idx;
1743                         break;
1744                 case 39:
1745                         term.c.attr.fg = defaultfg;
1746                         break;
1747                 case 48:
1748                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1749                                 term.c.attr.bg = idx;
1750                         break;
1751                 case 49:
1752                         term.c.attr.bg = defaultbg;
1753                         break;
1754                 default:
1755                         if(BETWEEN(attr[i], 30, 37)) {
1756                                 term.c.attr.fg = attr[i] - 30;
1757                         } else if(BETWEEN(attr[i], 40, 47)) {
1758                                 term.c.attr.bg = attr[i] - 40;
1759                         } else if(BETWEEN(attr[i], 90, 97)) {
1760                                 term.c.attr.fg = attr[i] - 90 + 8;
1761                         } else if(BETWEEN(attr[i], 100, 107)) {
1762                                 term.c.attr.bg = attr[i] - 100 + 8;
1763                         } else {
1764                                 fprintf(stderr,
1765                                         "erresc(default): gfx attr %d unknown\n",
1766                                         attr[i]), csidump();
1767                         }
1768                         break;
1769                 }
1770         }
1771 }
1772
1773 void
1774 tsetscroll(int t, int b) {
1775         int temp;
1776
1777         LIMIT(t, 0, term.row-1);
1778         LIMIT(b, 0, term.row-1);
1779         if(t > b) {
1780                 temp = t;
1781                 t = b;
1782                 b = temp;
1783         }
1784         term.top = t;
1785         term.bot = b;
1786 }
1787
1788 void
1789 tsetmode(bool priv, bool set, int *args, int narg) {
1790         int *lim, mode;
1791         bool alt;
1792
1793         for(lim = args + narg; args < lim; ++args) {
1794                 if(priv) {
1795                         switch(*args) {
1796                         case 1: /* DECCKM -- Cursor key */
1797                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1798                                 break;
1799                         case 5: /* DECSCNM -- Reverse video */
1800                                 mode = term.mode;
1801                                 MODBIT(term.mode, set, MODE_REVERSE);
1802                                 if(mode != term.mode)
1803                                         redraw(REDRAW_TIMEOUT);
1804                                 break;
1805                         case 6: /* DECOM -- Origin */
1806                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1807                                 tmoveato(0, 0);
1808                                 break;
1809                         case 7: /* DECAWM -- Auto wrap */
1810                                 MODBIT(term.mode, set, MODE_WRAP);
1811                                 break;
1812                         case 0:  /* Error (IGNORED) */
1813                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1814                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1815                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1816                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1817                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1818                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1819                         case 42: /* DECNRCM -- National characters (IGNORED) */
1820                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1821                                 break;
1822                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1823                                 MODBIT(term.mode, !set, MODE_HIDE);
1824                                 break;
1825                         case 9:    /* X10 mouse compatibility mode */
1826                                 xsetpointermotion(0);
1827                                 MODBIT(term.mode, 0, MODE_MOUSE);
1828                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1829                                 break;
1830                         case 1000: /* 1000: report button press */
1831                                 xsetpointermotion(0);
1832                                 MODBIT(term.mode, 0, MODE_MOUSE);
1833                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1834                                 break;
1835                         case 1002: /* 1002: report motion on button press */
1836                                 xsetpointermotion(0);
1837                                 MODBIT(term.mode, 0, MODE_MOUSE);
1838                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1839                                 break;
1840                         case 1003: /* 1003: enable all mouse motions */
1841                                 xsetpointermotion(set);
1842                                 MODBIT(term.mode, 0, MODE_MOUSE);
1843                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1844                                 break;
1845                         case 1004: /* 1004: send focus events to tty */
1846                                 MODBIT(term.mode, set, MODE_FOCUS);
1847                                 break;
1848                         case 1006: /* 1006: extended reporting mode */
1849                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1850                                 break;
1851                         case 1034:
1852                                 MODBIT(term.mode, set, MODE_8BIT);
1853                                 break;
1854                         case 1049: /* swap screen & set/restore cursor as xterm */
1855                                 if (!allowaltscreen)
1856                                         break;
1857                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1858                                 /* FALLTHRU */
1859                         case 47: /* swap screen */
1860                         case 1047:
1861                                 if (!allowaltscreen)
1862                                         break;
1863                                 alt = IS_SET(MODE_ALTSCREEN);
1864                                 if(alt) {
1865                                         tclearregion(0, 0, term.col-1,
1866                                                         term.row-1);
1867                                 }
1868                                 if(set ^ alt) /* set is always 1 or 0 */
1869                                         tswapscreen();
1870                                 if(*args != 1049)
1871                                         break;
1872                                 /* FALLTRU */
1873                         case 1048:
1874                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1875                                 break;
1876                         case 2004: /* 2004: bracketed paste mode */
1877                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1878                                 break;
1879                         /* Not implemented mouse modes. See comments there. */
1880                         case 1001: /* mouse highlight mode; can hang the
1881                                       terminal by design when implemented. */
1882                         case 1005: /* UTF-8 mouse mode; will confuse
1883                                       applications not supporting UTF-8
1884                                       and luit. */
1885                         case 1015: /* urxvt mangled mouse mode; incompatible
1886                                       and can be mistaken for other control
1887                                       codes. */
1888                         default:
1889                                 fprintf(stderr,
1890                                         "erresc: unknown private set/reset mode %d\n",
1891                                         *args);
1892                                 break;
1893                         }
1894                 } else {
1895                         switch(*args) {
1896                         case 0:  /* Error (IGNORED) */
1897                                 break;
1898                         case 2:  /* KAM -- keyboard action */
1899                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1900                                 break;
1901                         case 4:  /* IRM -- Insertion-replacement */
1902                                 MODBIT(term.mode, set, MODE_INSERT);
1903                                 break;
1904                         case 12: /* SRM -- Send/Receive */
1905                                 MODBIT(term.mode, !set, MODE_ECHO);
1906                                 break;
1907                         case 20: /* LNM -- Linefeed/new line */
1908                                 MODBIT(term.mode, set, MODE_CRLF);
1909                                 break;
1910                         default:
1911                                 fprintf(stderr,
1912                                         "erresc: unknown set/reset mode %d\n",
1913                                         *args);
1914                                 break;
1915                         }
1916                 }
1917         }
1918 }
1919
1920 void
1921 csihandle(void) {
1922         char buf[40];
1923         int len;
1924
1925         switch(csiescseq.mode) {
1926         default:
1927         unknown:
1928                 fprintf(stderr, "erresc: unknown csi ");
1929                 csidump();
1930                 /* die(""); */
1931                 break;
1932         case '@': /* ICH -- Insert <n> blank char */
1933                 DEFAULT(csiescseq.arg[0], 1);
1934                 tinsertblank(csiescseq.arg[0]);
1935                 break;
1936         case 'A': /* CUU -- Cursor <n> Up */
1937                 DEFAULT(csiescseq.arg[0], 1);
1938                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1939                 break;
1940         case 'B': /* CUD -- Cursor <n> Down */
1941         case 'e': /* VPR --Cursor <n> Down */
1942                 DEFAULT(csiescseq.arg[0], 1);
1943                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1944                 break;
1945         case 'i': /* MC -- Media Copy */
1946                 switch(csiescseq.arg[0]) {
1947                 case 0:
1948                         tdump();
1949                         break;
1950                 case 1:
1951                         tdumpline(term.c.y);
1952                         break;
1953                 case 2:
1954                         tdumpsel();
1955                         break;
1956                 case 4:
1957                         term.mode &= ~MODE_PRINT;
1958                         break;
1959                 case 5:
1960                         term.mode |= MODE_PRINT;
1961                         break;
1962                 }
1963                 break;
1964         case 'c': /* DA -- Device Attributes */
1965                 if(csiescseq.arg[0] == 0)
1966                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1967                 break;
1968         case 'C': /* CUF -- Cursor <n> Forward */
1969         case 'a': /* HPR -- Cursor <n> Forward */
1970                 DEFAULT(csiescseq.arg[0], 1);
1971                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1972                 break;
1973         case 'D': /* CUB -- Cursor <n> Backward */
1974                 DEFAULT(csiescseq.arg[0], 1);
1975                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1976                 break;
1977         case 'E': /* CNL -- Cursor <n> Down and first col */
1978                 DEFAULT(csiescseq.arg[0], 1);
1979                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1980                 break;
1981         case 'F': /* CPL -- Cursor <n> Up and first col */
1982                 DEFAULT(csiescseq.arg[0], 1);
1983                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1984                 break;
1985         case 'g': /* TBC -- Tabulation clear */
1986                 switch(csiescseq.arg[0]) {
1987                 case 0: /* clear current tab stop */
1988                         term.tabs[term.c.x] = 0;
1989                         break;
1990                 case 3: /* clear all the tabs */
1991                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1992                         break;
1993                 default:
1994                         goto unknown;
1995                 }
1996                 break;
1997         case 'G': /* CHA -- Move to <col> */
1998         case '`': /* HPA */
1999                 DEFAULT(csiescseq.arg[0], 1);
2000                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2001                 break;
2002         case 'H': /* CUP -- Move to <row> <col> */
2003         case 'f': /* HVP */
2004                 DEFAULT(csiescseq.arg[0], 1);
2005                 DEFAULT(csiescseq.arg[1], 1);
2006                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2007                 break;
2008         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2009                 DEFAULT(csiescseq.arg[0], 1);
2010                 tputtab(csiescseq.arg[0]);
2011                 break;
2012         case 'J': /* ED -- Clear screen */
2013                 selclear(NULL);
2014                 switch(csiescseq.arg[0]) {
2015                 case 0: /* below */
2016                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2017                         if(term.c.y < term.row-1) {
2018                                 tclearregion(0, term.c.y+1, term.col-1,
2019                                                 term.row-1);
2020                         }
2021                         break;
2022                 case 1: /* above */
2023                         if(term.c.y > 1)
2024                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2025                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2026                         break;
2027                 case 2: /* all */
2028                         tclearregion(0, 0, term.col-1, term.row-1);
2029                         break;
2030                 default:
2031                         goto unknown;
2032                 }
2033                 break;
2034         case 'K': /* EL -- Clear line */
2035                 switch(csiescseq.arg[0]) {
2036                 case 0: /* right */
2037                         tclearregion(term.c.x, term.c.y, term.col-1,
2038                                         term.c.y);
2039                         break;
2040                 case 1: /* left */
2041                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2042                         break;
2043                 case 2: /* all */
2044                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2045                         break;
2046                 }
2047                 break;
2048         case 'S': /* SU -- Scroll <n> line up */
2049                 DEFAULT(csiescseq.arg[0], 1);
2050                 tscrollup(term.top, csiescseq.arg[0]);
2051                 break;
2052         case 'T': /* SD -- Scroll <n> line down */
2053                 DEFAULT(csiescseq.arg[0], 1);
2054                 tscrolldown(term.top, csiescseq.arg[0]);
2055                 break;
2056         case 'L': /* IL -- Insert <n> blank lines */
2057                 DEFAULT(csiescseq.arg[0], 1);
2058                 tinsertblankline(csiescseq.arg[0]);
2059                 break;
2060         case 'l': /* RM -- Reset Mode */
2061                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2062                 break;
2063         case 'M': /* DL -- Delete <n> lines */
2064                 DEFAULT(csiescseq.arg[0], 1);
2065                 tdeleteline(csiescseq.arg[0]);
2066                 break;
2067         case 'X': /* ECH -- Erase <n> char */
2068                 DEFAULT(csiescseq.arg[0], 1);
2069                 tclearregion(term.c.x, term.c.y,
2070                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2071                 break;
2072         case 'P': /* DCH -- Delete <n> char */
2073                 DEFAULT(csiescseq.arg[0], 1);
2074                 tdeletechar(csiescseq.arg[0]);
2075                 break;
2076         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2077                 DEFAULT(csiescseq.arg[0], 1);
2078                 tputtab(-csiescseq.arg[0]);
2079                 break;
2080         case 'd': /* VPA -- Move to <row> */
2081                 DEFAULT(csiescseq.arg[0], 1);
2082                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2083                 break;
2084         case 'h': /* SM -- Set terminal mode */
2085                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2086                 break;
2087         case 'm': /* SGR -- Terminal attribute (color) */
2088                 tsetattr(csiescseq.arg, csiescseq.narg);
2089                 break;
2090         case 'n': /* DSR – Device Status Report (cursor position) */
2091                 if (csiescseq.arg[0] == 6) {
2092                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2093                                         term.c.y+1, term.c.x+1);
2094                         ttywrite(buf, len);
2095                 }
2096                 break;
2097         case 'r': /* DECSTBM -- Set Scrolling Region */
2098                 if(csiescseq.priv) {
2099                         goto unknown;
2100                 } else {
2101                         DEFAULT(csiescseq.arg[0], 1);
2102                         DEFAULT(csiescseq.arg[1], term.row);
2103                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2104                         tmoveato(0, 0);
2105                 }
2106                 break;
2107         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2108                 tcursor(CURSOR_SAVE);
2109                 break;
2110         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2111                 tcursor(CURSOR_LOAD);
2112                 break;
2113         }
2114 }
2115
2116 void
2117 csidump(void) {
2118         int i;
2119         uint c;
2120
2121         printf("ESC[");
2122         for(i = 0; i < csiescseq.len; i++) {
2123                 c = csiescseq.buf[i] & 0xff;
2124                 if(isprint(c)) {
2125                         putchar(c);
2126                 } else if(c == '\n') {
2127                         printf("(\\n)");
2128                 } else if(c == '\r') {
2129                         printf("(\\r)");
2130                 } else if(c == 0x1b) {
2131                         printf("(\\e)");
2132                 } else {
2133                         printf("(%02x)", c);
2134                 }
2135         }
2136         putchar('\n');
2137 }
2138
2139 void
2140 csireset(void) {
2141         memset(&csiescseq, 0, sizeof(csiescseq));
2142 }
2143
2144 void
2145 strhandle(void) {
2146         char *p = NULL;
2147         int j, narg, par;
2148
2149         term.esc &= ~(ESC_STR_END|ESC_STR);
2150         strparse();
2151         narg = strescseq.narg;
2152         par = atoi(strescseq.args[0]);
2153
2154         switch(strescseq.type) {
2155         case ']': /* OSC -- Operating System Command */
2156                 switch(par) {
2157                 case 0:
2158                 case 1:
2159                 case 2:
2160                         if(narg > 1)
2161                                 xsettitle(strescseq.args[1]);
2162                         return;
2163                 case 4: /* color set */
2164                         if(narg < 3)
2165                                 break;
2166                         p = strescseq.args[2];
2167                         /* fall through */
2168                 case 104: /* color reset, here p = NULL */
2169                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2170                         if (!xsetcolorname(j, p)) {
2171                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2172                         } else {
2173                                 /*
2174                                  * TODO if defaultbg color is changed, borders
2175                                  * are dirty
2176                                  */
2177                                 redraw(0);
2178                         }
2179                         return;
2180                 }
2181                 break;
2182         case 'k': /* old title set compatibility */
2183                 xsettitle(strescseq.args[0]);
2184                 return;
2185         case 'P': /* DCS -- Device Control String */
2186         case '_': /* APC -- Application Program Command */
2187         case '^': /* PM -- Privacy Message */
2188                 return;
2189         }
2190
2191         fprintf(stderr, "erresc: unknown str ");
2192         strdump();
2193 }
2194
2195 void
2196 strparse(void) {
2197         char *p = strescseq.buf;
2198
2199         strescseq.narg = 0;
2200         strescseq.buf[strescseq.len] = '\0';
2201         while(p && strescseq.narg < STR_ARG_SIZ)
2202                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2203 }
2204
2205 void
2206 strdump(void) {
2207         int i;
2208         uint c;
2209
2210         printf("ESC%c", strescseq.type);
2211         for(i = 0; i < strescseq.len; i++) {
2212                 c = strescseq.buf[i] & 0xff;
2213                 if(c == '\0') {
2214                         return;
2215                 } else if(isprint(c)) {
2216                         putchar(c);
2217                 } else if(c == '\n') {
2218                         printf("(\\n)");
2219                 } else if(c == '\r') {
2220                         printf("(\\r)");
2221                 } else if(c == 0x1b) {
2222                         printf("(\\e)");
2223                 } else {
2224                         printf("(%02x)", c);
2225                 }
2226         }
2227         printf("ESC\\\n");
2228 }
2229
2230 void
2231 strreset(void) {
2232         memset(&strescseq, 0, sizeof(strescseq));
2233 }
2234
2235 void
2236 tprinter(char *s, size_t len) {
2237         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2238                 fprintf(stderr, "Error writing in %s:%s\n",
2239                         opt_io, strerror(errno));
2240                 close(iofd);
2241                 iofd = -1;
2242         }
2243 }
2244
2245 void
2246 toggleprinter(const Arg *arg) {
2247         term.mode ^= MODE_PRINT;
2248 }
2249
2250 void
2251 printscreen(const Arg *arg) {
2252         tdump();
2253 }
2254
2255 void
2256 printsel(const Arg *arg) {
2257         tdumpsel();
2258 }
2259
2260 void
2261 tdumpsel(void) {
2262         char *ptr;
2263
2264         if((ptr = getsel())) {
2265                 tprinter(ptr, strlen(ptr));
2266                 free(ptr);
2267         }
2268 }
2269
2270 void
2271 tdumpline(int n) {
2272         Glyph *bp, *end;
2273
2274         bp = &term.line[n][0];
2275         end = &bp[term.col-1];
2276         while(end > bp && !strcmp(" ", end->c))
2277                 --end;
2278         if(bp != end || strcmp(bp->c, " ")) {
2279                 for( ;bp <= end; ++bp)
2280                         tprinter(bp->c, strlen(bp->c));
2281         }
2282         tprinter("\n", 1);
2283 }
2284
2285 void
2286 tdump(void) {
2287         int i;
2288
2289         for(i = 0; i < term.row; ++i)
2290                 tdumpline(i);
2291 }
2292
2293 void
2294 tputtab(int n) {
2295         uint x = term.c.x;
2296
2297         if(n > 0) {
2298                 while(x < term.col && n--)
2299                         for(++x; x < term.col && !term.tabs[x]; ++x)
2300                                 /* nothing */ ;
2301         } else if(n < 0) {
2302                 while(x > 0 && n++)
2303                         for(--x; x > 0 && !term.tabs[x]; --x)
2304                                 /* nothing */ ;
2305         }
2306         tmoveto(x, term.c.y);
2307 }
2308
2309 void
2310 techo(char *buf, int len) {
2311         for(; len > 0; buf++, len--) {
2312                 char c = *buf;
2313
2314                 if(ISCONTROL(c)) { /* control code */
2315                         if(c & 0x80) {
2316                                 c &= 0x7f;
2317                                 tputc("^", 1);
2318                                 tputc("[", 1);
2319                         } else if(c != '\n' && c != '\r' && c != '\t') {
2320                                 c ^= '\x40';
2321                                 tputc("^", 1);
2322                         }
2323                         tputc(&c, 1);
2324                 } else {
2325                         break;
2326                 }
2327         }
2328         if(len)
2329                 tputc(buf, len);
2330 }
2331
2332 void
2333 tdeftran(char ascii) {
2334         char c, (*bp)[2];
2335         static char tbl[][2] = {
2336                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2337                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2338                 {'5', CS_FIN},      {'C', CS_FIN},
2339                 {0, 0}
2340         };
2341
2342         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2343                 /* nothing */;
2344
2345         if (c == 0)
2346                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2347         else
2348                 term.trantbl[term.icharset] = (*bp)[1];
2349 }
2350
2351 void
2352 tselcs(void) {
2353         MODBIT(term.c.attr.mode,
2354                term.trantbl[term.charset] == CS_GRAPHIC0,
2355                ATTR_GFX);
2356 }
2357
2358 bool
2359 tcontrolcode(uchar ascii) {
2360         static char question[UTF_SIZ] = "?";
2361
2362         switch(ascii) {
2363         case '\t':   /* HT */
2364                 tputtab(1);
2365                 break;
2366         case '\b':   /* BS */
2367                 tmoveto(term.c.x-1, term.c.y);
2368                 break;
2369         case '\r':   /* CR */
2370                 tmoveto(0, term.c.y);
2371                 break;
2372         case '\f':   /* LF */
2373         case '\v':   /* VT */
2374         case '\n':   /* LF */
2375                 /* go to first col if the mode is set */
2376                 tnewline(IS_SET(MODE_CRLF));
2377                 break;
2378         case '\a':   /* BEL */
2379                 if(term.esc & ESC_STR_END) {
2380                         /* backwards compatibility to xterm */
2381                         strhandle();
2382                 } else {
2383                         if(!(xw.state & WIN_FOCUSED))
2384                                 xseturgency(1);
2385                         if (bellvolume)
2386                                 XBell(xw.dpy, bellvolume);
2387                 }
2388                 break;
2389         case '\033': /* ESC */
2390                 csireset();
2391                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2392                 term.esc |= ESC_START;
2393                 return 1;
2394         case '\016': /* SO */
2395                 term.charset = 0;
2396                 tselcs();
2397                 break;
2398         case '\017': /* SI */
2399                 term.charset = 1;
2400                 tselcs();
2401                 break;
2402         case '\032': /* SUB */
2403                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2404         case '\030': /* CAN */
2405                 csireset();
2406                 break;
2407         case '\005': /* ENQ (IGNORED) */
2408         case '\000': /* NUL (IGNORED) */
2409         case '\021': /* XON (IGNORED) */
2410         case '\023': /* XOFF (IGNORED) */
2411         case 0177:   /* DEL (IGNORED) */
2412         case 0x84:   /* TODO: IND */
2413         case 0x85:   /* TODO: NEL */
2414         case 0x88:   /* TODO: HTS */
2415         case 0x8d:   /* TODO: RI */
2416         case 0x8e:   /* TODO: SS2 */
2417         case 0x8f:   /* TODO: SS3 */
2418         case 0x90:   /* TODO: DCS */
2419         case 0x98:   /* TODO: SOS */
2420         case 0x9a:   /* TODO: DECID */
2421         case 0x9b:   /* TODO: CSI */
2422         case 0x9c:   /* TODO: ST */
2423         case 0x9d:   /* TODO: OSC */
2424         case 0x9e:   /* TODO: PM */
2425         case 0x9f:   /* TODO: APC */
2426                 break;
2427         default:
2428                 return 0;
2429         }
2430         term.esc &= ~(ESC_STR_END|ESC_STR);
2431         return 1;
2432 }
2433
2434 void
2435 tdectest(char c) {
2436         static char E[UTF_SIZ] = "E";
2437         int x, y;
2438
2439         if(c == '8') { /* DEC screen alignment test. */
2440                 for(x = 0; x < term.col; ++x) {
2441                         for(y = 0; y < term.row; ++y)
2442                                 tsetchar(E, &term.c.attr, x, y);
2443                 }
2444         }
2445 }
2446
2447 void
2448 tputc(char *c, int len) {
2449         uchar ascii;
2450         bool control;
2451         long unicodep;
2452         int width;
2453         Glyph *gp;
2454
2455         if(len == 1) {
2456                 width = 1;
2457                 unicodep = ascii = *c;
2458         } else {
2459                 utf8decode(c, &unicodep, UTF_SIZ);
2460                 width = wcwidth(unicodep);
2461                 control = ISCONTROLC1(unicodep);
2462                 ascii = unicodep;
2463         }
2464
2465         if(IS_SET(MODE_PRINT))
2466                 tprinter(c, len);
2467         control = ISCONTROL(unicodep);
2468
2469         /*
2470          * STR sequence must be checked before anything else
2471          * because it uses all following characters until it
2472          * receives a ESC, a SUB, a ST or any other C1 control
2473          * character.
2474          */
2475         if(term.esc & ESC_STR) {
2476                 if(width == 1 &&
2477                    (ascii == '\a' || ascii == 030 ||
2478                     ascii == 032  || ascii == 033 ||
2479                     ISCONTROLC1(unicodep))) {
2480                         term.esc &= ~ESC_STR;
2481                         term.esc |= ESC_STR_END;
2482                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2483                         memmove(&strescseq.buf[strescseq.len], c, len);
2484                         strescseq.len += len;
2485                         return;
2486                 } else {
2487                 /*
2488                  * Here is a bug in terminals. If the user never sends
2489                  * some code to stop the str or esc command, then st
2490                  * will stop responding. But this is better than
2491                  * silently failing with unknown characters. At least
2492                  * then users will report back.
2493                  *
2494                  * In the case users ever get fixed, here is the code:
2495                  */
2496                 /*
2497                  * term.esc = 0;
2498                  * strhandle();
2499                  */
2500                         return;
2501                 }
2502         }
2503
2504         /*
2505          * Actions of control codes must be performed as soon they arrive
2506          * because they can be embedded inside a control sequence, and
2507          * they must not cause conflicts with sequences.
2508          */
2509         if(control) {
2510                 if (tcontrolcode(ascii))
2511                         return;
2512         } else if(term.esc & ESC_START) {
2513                 if(term.esc & ESC_CSI) {
2514                         csiescseq.buf[csiescseq.len++] = ascii;
2515                         if(BETWEEN(ascii, 0x40, 0x7E)
2516                                         || csiescseq.len >= \
2517                                         sizeof(csiescseq.buf)-1) {
2518                                 term.esc = 0;
2519                                 csiparse();
2520                                 csihandle();
2521                         }
2522                         return;
2523                 } else if(term.esc & ESC_ALTCHARSET) {
2524                         tdeftran(ascii);
2525                         tselcs();
2526                 } else if(term.esc & ESC_TEST) {
2527                         tdectest(ascii);
2528                 } else {
2529                         switch(ascii) {
2530                         case '[':
2531                                 term.esc |= ESC_CSI;
2532                                 return;
2533                         case '#':
2534                                 term.esc |= ESC_TEST;
2535                                 return;
2536                         case 'P': /* DCS -- Device Control String */
2537                         case '_': /* APC -- Application Program Command */
2538                         case '^': /* PM -- Privacy Message */
2539                         case ']': /* OSC -- Operating System Command */
2540                         case 'k': /* old title set compatibility */
2541                                 strreset();
2542                                 strescseq.type = ascii;
2543                                 term.esc |= ESC_STR;
2544                                 return;
2545                         case '(': /* set primary charset G0 */
2546                         case ')': /* set secondary charset G1 */
2547                         case '*': /* set tertiary charset G2 */
2548                         case '+': /* set quaternary charset G3 */
2549                                 term.icharset = ascii - '(';
2550                                 term.esc |= ESC_ALTCHARSET;
2551                                 return;
2552                         case 'D': /* IND -- Linefeed */
2553                                 if(term.c.y == term.bot) {
2554                                         tscrollup(term.top, 1);
2555                                 } else {
2556                                         tmoveto(term.c.x, term.c.y+1);
2557                                 }
2558                                 break;
2559                         case 'E': /* NEL -- Next line */
2560                                 tnewline(1); /* always go to first col */
2561                                 break;
2562                         case 'H': /* HTS -- Horizontal tab stop */
2563                                 term.tabs[term.c.x] = 1;
2564                                 break;
2565                         case 'M': /* RI -- Reverse index */
2566                                 if(term.c.y == term.top) {
2567                                         tscrolldown(term.top, 1);
2568                                 } else {
2569                                         tmoveto(term.c.x, term.c.y-1);
2570                                 }
2571                                 break;
2572                         case 'Z': /* DECID -- Identify Terminal */
2573                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2574                                 break;
2575                         case 'c': /* RIS -- Reset to inital state */
2576                                 treset();
2577                                 xresettitle();
2578                                 xloadcols();
2579                                 break;
2580                         case '=': /* DECPAM -- Application keypad */
2581                                 term.mode |= MODE_APPKEYPAD;
2582                                 break;
2583                         case '>': /* DECPNM -- Normal keypad */
2584                                 term.mode &= ~MODE_APPKEYPAD;
2585                                 break;
2586                         case '7': /* DECSC -- Save Cursor */
2587                                 tcursor(CURSOR_SAVE);
2588                                 break;
2589                         case '8': /* DECRC -- Restore Cursor */
2590                                 tcursor(CURSOR_LOAD);
2591                                 break;
2592                         case '\\': /* ST -- String Terminator */
2593                                 if(term.esc & ESC_STR_END)
2594                                         strhandle();
2595                                 break;
2596                         default:
2597                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2598                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2599                                 break;
2600                         }
2601                 }
2602                 term.esc = 0;
2603                 /*
2604                  * All characters which form part of a sequence are not
2605                  * printed
2606                  */
2607                 return;
2608         }
2609         /*
2610          * Display control codes only if we are in graphic mode
2611          */
2612         if(control && !(term.c.attr.mode & ATTR_GFX))
2613                 return;
2614         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2615                 selclear(NULL);
2616
2617         gp = &term.line[term.c.y][term.c.x];
2618         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2619                 gp->mode |= ATTR_WRAP;
2620                 tnewline(1);
2621         }
2622
2623         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2624                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2625
2626         if(term.c.x+width > term.col)
2627                 tnewline(1);
2628
2629         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2630
2631         if(width == 2) {
2632                 gp->mode |= ATTR_WIDE;
2633                 if(term.c.x+1 < term.col) {
2634                         gp[1].c[0] = '\0';
2635                         gp[1].mode = ATTR_WDUMMY;
2636                 }
2637         }
2638         if(term.c.x+width < term.col) {
2639                 tmoveto(term.c.x+width, term.c.y);
2640         } else {
2641                 term.c.state |= CURSOR_WRAPNEXT;
2642         }
2643 }
2644
2645 int
2646 tresize(int col, int row) {
2647         int i;
2648         int minrow = MIN(row, term.row);
2649         int mincol = MIN(col, term.col);
2650         int slide = term.c.y - row + 1;
2651         bool *bp;
2652         Line *orig;
2653
2654         if(col < 1 || row < 1)
2655                 return 0;
2656
2657         /* free unneeded rows */
2658         i = 0;
2659         if(slide > 0) {
2660                 /*
2661                  * slide screen to keep cursor where we expect it -
2662                  * tscrollup would work here, but we can optimize to
2663                  * memmove because we're freeing the earlier lines
2664                  */
2665                 for(/* i = 0 */; i < slide; i++) {
2666                         free(term.line[i]);
2667                         free(term.alt[i]);
2668                 }
2669                 memmove(term.line, term.line + slide, row * sizeof(Line));
2670                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2671         }
2672         for(i += row; i < term.row; i++) {
2673                 free(term.line[i]);
2674                 free(term.alt[i]);
2675         }
2676
2677         /* resize to new height */
2678         term.line = xrealloc(term.line, row * sizeof(Line));
2679         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2680         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2681         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2682
2683         /* resize each row to new width, zero-pad if needed */
2684         for(i = 0; i < minrow; i++) {
2685                 term.dirty[i] = 1;
2686                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2687                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2688         }
2689
2690         /* allocate any new rows */
2691         for(/* i == minrow */; i < row; i++) {
2692                 term.dirty[i] = 1;
2693                 term.line[i] = xmalloc(col * sizeof(Glyph));
2694                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2695         }
2696         if(col > term.col) {
2697                 bp = term.tabs + term.col;
2698
2699                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2700                 while(--bp > term.tabs && !*bp)
2701                         /* nothing */ ;
2702                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2703                         *bp = 1;
2704         }
2705         /* update terminal size */
2706         term.col = col;
2707         term.row = row;
2708         /* reset scrolling region */
2709         tsetscroll(0, row-1);
2710         /* make use of the LIMIT in tmoveto */
2711         tmoveto(term.c.x, term.c.y);
2712         /* Clearing both screens */
2713         orig = term.line;
2714         do {
2715                 if(mincol < col && 0 < minrow) {
2716                         tclearregion(mincol, 0, col - 1, minrow - 1);
2717                 }
2718                 if(0 < col && minrow < row) {
2719                         tclearregion(0, minrow, col - 1, row - 1);
2720                 }
2721                 tcursor(CURSOR_SAVE);
2722                 tswapscreen();
2723                 tcursor(CURSOR_LOAD);
2724         } while(orig != term.line);
2725
2726         return (slide > 0);
2727 }
2728
2729 void
2730 xresize(int col, int row) {
2731         xw.tw = MAX(1, col * xw.cw);
2732         xw.th = MAX(1, row * xw.ch);
2733
2734         XFreePixmap(xw.dpy, xw.buf);
2735         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2736                         DefaultDepth(xw.dpy, xw.scr));
2737         XftDrawChange(xw.draw, xw.buf);
2738         xclear(0, 0, xw.w, xw.h);
2739 }
2740
2741 static inline ushort
2742 sixd_to_16bit(int x) {
2743         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2744 }
2745
2746 void
2747 xloadcols(void) {
2748         int i, r, g, b;
2749         XRenderColor color = { .alpha = 0xffff };
2750         static bool loaded;
2751         Colour *cp;
2752
2753         if(loaded) {
2754                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2755                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2756         }
2757
2758         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2759         for(i = 0; i < LEN(colorname); i++) {
2760                 if(!colorname[i])
2761                         continue;
2762                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2763                         die("Could not allocate color '%s'\n", colorname[i]);
2764                 }
2765         }
2766
2767         /* load colors [16-255] ; same colors as xterm */
2768         for(i = 16, r = 0; r < 6; r++) {
2769                 for(g = 0; g < 6; g++) {
2770                         for(b = 0; b < 6; b++) {
2771                                 color.red = sixd_to_16bit(r);
2772                                 color.green = sixd_to_16bit(g);
2773                                 color.blue = sixd_to_16bit(b);
2774                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2775                                         die("Could not allocate color %d\n", i);
2776                                 }
2777                                 i++;
2778                         }
2779                 }
2780         }
2781
2782         for(r = 0; r < 24; r++, i++) {
2783                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2784                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2785                                         &dc.col[i])) {
2786                         die("Could not allocate color %d\n", i);
2787                 }
2788         }
2789         loaded = true;
2790 }
2791
2792 int
2793 xsetcolorname(int x, const char *name) {
2794         XRenderColor color = { .alpha = 0xffff };
2795         Colour colour;
2796         if(!BETWEEN(x, 0, LEN(colorname)))
2797                 return -1;
2798         if(!name) {
2799                 if(BETWEEN(x, 16, 16 + 215)) {
2800                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2801                         color.red = sixd_to_16bit(r);
2802                         color.green = sixd_to_16bit(g);
2803                         color.blue = sixd_to_16bit(b);
2804                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2805                                 return 0; /* something went wrong */
2806                         dc.col[x] = colour;
2807                         return 1;
2808                 } else if(BETWEEN(x, 16 + 216, 255)) {
2809                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2810                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2811                                 return 0; /* something went wrong */
2812                         dc.col[x] = colour;
2813                         return 1;
2814                 } else {
2815                         name = colorname[x];
2816                 }
2817         }
2818         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2819                 return 0;
2820         dc.col[x] = colour;
2821         return 1;
2822 }
2823
2824 void
2825 xtermclear(int col1, int row1, int col2, int row2) {
2826         XftDrawRect(xw.draw,
2827                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2828                         borderpx + col1 * xw.cw,
2829                         borderpx + row1 * xw.ch,
2830                         (col2-col1+1) * xw.cw,
2831                         (row2-row1+1) * xw.ch);
2832 }
2833
2834 /*
2835  * Absolute coordinates.
2836  */
2837 void
2838 xclear(int x1, int y1, int x2, int y2) {
2839         XftDrawRect(xw.draw,
2840                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2841                         x1, y1, x2-x1, y2-y1);
2842 }
2843
2844 void
2845 xhints(void) {
2846         XClassHint class = {opt_class ? opt_class : termname, termname};
2847         XWMHints wm = {.flags = InputHint, .input = 1};
2848         XSizeHints *sizeh = NULL;
2849
2850         sizeh = XAllocSizeHints();
2851
2852         sizeh->flags = PSize | PResizeInc | PBaseSize;
2853         sizeh->height = xw.h;
2854         sizeh->width = xw.w;
2855         sizeh->height_inc = xw.ch;
2856         sizeh->width_inc = xw.cw;
2857         sizeh->base_height = 2 * borderpx;
2858         sizeh->base_width = 2 * borderpx;
2859         if(xw.isfixed == True) {
2860                 sizeh->flags |= PMaxSize | PMinSize;
2861                 sizeh->min_width = sizeh->max_width = xw.w;
2862                 sizeh->min_height = sizeh->max_height = xw.h;
2863         }
2864         if(xw.gm & (XValue|YValue)) {
2865                 sizeh->flags |= USPosition | PWinGravity;
2866                 sizeh->x = xw.l;
2867                 sizeh->y = xw.t;
2868                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2869         }
2870
2871         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2872                         &class);
2873         XFree(sizeh);
2874 }
2875
2876 int
2877 xgeommasktogravity(int mask) {
2878         switch(mask & (XNegative|YNegative)) {
2879         case 0:
2880                 return NorthWestGravity;
2881         case XNegative:
2882                 return NorthEastGravity;
2883         case YNegative:
2884                 return SouthWestGravity;
2885         }
2886         return SouthEastGravity;
2887 }
2888
2889 int
2890 xloadfont(Font *f, FcPattern *pattern) {
2891         FcPattern *match;
2892         FcResult result;
2893
2894         match = FcFontMatch(NULL, pattern, &result);
2895         if(!match)
2896                 return 1;
2897
2898         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2899                 FcPatternDestroy(match);
2900                 return 1;
2901         }
2902
2903         f->set = NULL;
2904         f->pattern = FcPatternDuplicate(pattern);
2905
2906         f->ascent = f->match->ascent;
2907         f->descent = f->match->descent;
2908         f->lbearing = 0;
2909         f->rbearing = f->match->max_advance_width;
2910
2911         f->height = f->ascent + f->descent;
2912         f->width = f->lbearing + f->rbearing;
2913
2914         return 0;
2915 }
2916
2917 void
2918 xloadfonts(char *fontstr, double fontsize) {
2919         FcPattern *pattern;
2920         FcResult r_sz, r_psz;
2921         double fontval;
2922
2923         if(fontstr[0] == '-') {
2924                 pattern = XftXlfdParse(fontstr, False, False);
2925         } else {
2926                 pattern = FcNameParse((FcChar8 *)fontstr);
2927         }
2928
2929         if(!pattern)
2930                 die("st: can't open font %s\n", fontstr);
2931
2932         if(fontsize > 0) {
2933                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2934                 FcPatternDel(pattern, FC_SIZE);
2935                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2936                 usedfontsize = fontsize;
2937         } else {
2938                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2939                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2940                 if(r_psz == FcResultMatch) {
2941                         usedfontsize = fontval;
2942                 } else if(r_sz == FcResultMatch) {
2943                         usedfontsize = -1;
2944                 } else {
2945                         /*
2946                          * Default font size is 12, if none given. This is to
2947                          * have a known usedfontsize value.
2948                          */
2949                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2950                         usedfontsize = 12;
2951                 }
2952         }
2953
2954         FcConfigSubstitute(0, pattern, FcMatchPattern);
2955         FcDefaultSubstitute(pattern);
2956
2957         if(xloadfont(&dc.font, pattern))
2958                 die("st: can't open font %s\n", fontstr);
2959
2960         if(usedfontsize < 0) {
2961                 FcPatternGetDouble(dc.font.match->pattern,
2962                                    FC_PIXEL_SIZE, 0, &fontval);
2963                 usedfontsize = fontval;
2964         }
2965
2966         /* Setting character width and height. */
2967         xw.cw = CEIL(dc.font.width * cwscale);
2968         xw.ch = CEIL(dc.font.height * chscale);
2969
2970         FcPatternDel(pattern, FC_SLANT);
2971         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2972         if(xloadfont(&dc.ifont, pattern))
2973                 die("st: can't open font %s\n", fontstr);
2974
2975         FcPatternDel(pattern, FC_WEIGHT);
2976         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2977         if(xloadfont(&dc.ibfont, pattern))
2978                 die("st: can't open font %s\n", fontstr);
2979
2980         FcPatternDel(pattern, FC_SLANT);
2981         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2982         if(xloadfont(&dc.bfont, pattern))
2983                 die("st: can't open font %s\n", fontstr);
2984
2985         FcPatternDestroy(pattern);
2986 }
2987
2988 int
2989 xloadfontset(Font *f) {
2990         FcResult result;
2991
2992         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2993                 return 1;
2994         return 0;
2995 }
2996
2997 void
2998 xunloadfont(Font *f) {
2999         XftFontClose(xw.dpy, f->match);
3000         FcPatternDestroy(f->pattern);
3001         if(f->set)
3002                 FcFontSetDestroy(f->set);
3003 }
3004
3005 void
3006 xunloadfonts(void) {
3007         int i;
3008
3009         /* Free the loaded fonts in the font cache.  */
3010         for(i = 0; i < frclen; i++) {
3011                 XftFontClose(xw.dpy, frc[i].font);
3012         }
3013         frclen = 0;
3014
3015         xunloadfont(&dc.font);
3016         xunloadfont(&dc.bfont);
3017         xunloadfont(&dc.ifont);
3018         xunloadfont(&dc.ibfont);
3019 }
3020
3021 void
3022 xzoom(const Arg *arg) {
3023         xunloadfonts();
3024         xloadfonts(usedfont, usedfontsize + arg->i);
3025         cresize(0, 0);
3026         redraw(0);
3027 }
3028
3029 void
3030 xinit(void) {
3031         XGCValues gcvalues;
3032         Cursor cursor;
3033         Window parent;
3034         pid_t thispid = getpid();
3035
3036         if(!(xw.dpy = XOpenDisplay(NULL)))
3037                 die("Can't open display\n");
3038         xw.scr = XDefaultScreen(xw.dpy);
3039         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3040
3041         /* font */
3042         if(!FcInit())
3043                 die("Could not init fontconfig.\n");
3044
3045         usedfont = (opt_font == NULL)? font : opt_font;
3046         xloadfonts(usedfont, 0);
3047
3048         /* colors */
3049         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3050         xloadcols();
3051
3052         /* adjust fixed window geometry */
3053         xw.w = 2 * borderpx + term.col * xw.cw;
3054         xw.h = 2 * borderpx + term.row * xw.ch;
3055         if(xw.gm & XNegative)
3056                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3057         if(xw.gm & YNegative)
3058                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3059
3060         /* Events */
3061         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3062         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3063         xw.attrs.bit_gravity = NorthWestGravity;
3064         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3065                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3066                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3067         xw.attrs.colormap = xw.cmap;
3068
3069         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3070                         XRootWindow(xw.dpy, xw.scr);
3071         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3072                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3073                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3074                         | CWEventMask | CWColormap, &xw.attrs);
3075
3076         memset(&gcvalues, 0, sizeof(gcvalues));
3077         gcvalues.graphics_exposures = False;
3078         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3079                         &gcvalues);
3080         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3081                         DefaultDepth(xw.dpy, xw.scr));
3082         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3083         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3084
3085         /* Xft rendering context */
3086         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3087
3088         /* input methods */
3089         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3090                 XSetLocaleModifiers("@im=local");
3091                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3092                         XSetLocaleModifiers("@im=");
3093                         if((xw.xim = XOpenIM(xw.dpy,
3094                                         NULL, NULL, NULL)) == NULL) {
3095                                 die("XOpenIM failed. Could not open input"
3096                                         " device.\n");
3097                         }
3098                 }
3099         }
3100         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3101                                            | XIMStatusNothing, XNClientWindow, xw.win,
3102                                            XNFocusWindow, xw.win, NULL);
3103         if(xw.xic == NULL)
3104                 die("XCreateIC failed. Could not obtain input method.\n");
3105
3106         /* white cursor, black outline */
3107         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3108         XDefineCursor(xw.dpy, xw.win, cursor);
3109         XRecolorCursor(xw.dpy, cursor,
3110                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3111                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3112
3113         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3114         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3115         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3116         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3117
3118         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3119         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3120                         PropModeReplace, (uchar *)&thispid, 1);
3121
3122         xresettitle();
3123         XMapWindow(xw.dpy, xw.win);
3124         xhints();
3125         XSync(xw.dpy, False);
3126 }
3127
3128 void
3129 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3130         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3131             width = charlen * xw.cw, xp, i;
3132         int frcflags;
3133         int u8fl, u8fblen, u8cblen, doesexist;
3134         char *u8c, *u8fs;
3135         long unicodep;
3136         Font *font = &dc.font;
3137         FcResult fcres;
3138         FcPattern *fcpattern, *fontpattern;
3139         FcFontSet *fcsets[] = { NULL };
3140         FcCharSet *fccharset;
3141         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3142         XRenderColor colfg, colbg;
3143         XRectangle r;
3144         int oneatatime;
3145
3146         frcflags = FRC_NORMAL;
3147
3148         if(base.mode & ATTR_ITALIC) {
3149                 if(base.fg == defaultfg)
3150                         base.fg = defaultitalic;
3151                 font = &dc.ifont;
3152                 frcflags = FRC_ITALIC;
3153         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3154                 if(base.fg == defaultfg)
3155                         base.fg = defaultitalic;
3156                 font = &dc.ibfont;
3157                 frcflags = FRC_ITALICBOLD;
3158         } else if(base.mode & ATTR_UNDERLINE) {
3159                 if(base.fg == defaultfg)
3160                         base.fg = defaultunderline;
3161         }
3162
3163         if(IS_TRUECOL(base.fg)) {
3164                 colfg.alpha = 0xffff;
3165                 colfg.red = TRUERED(base.fg);
3166                 colfg.green = TRUEGREEN(base.fg);
3167                 colfg.blue = TRUEBLUE(base.fg);
3168                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3169                 fg = &truefg;
3170         } else {
3171                 fg = &dc.col[base.fg];
3172         }
3173
3174         if(IS_TRUECOL(base.bg)) {
3175                 colbg.alpha = 0xffff;
3176                 colbg.green = TRUEGREEN(base.bg);
3177                 colbg.red = TRUERED(base.bg);
3178                 colbg.blue = TRUEBLUE(base.bg);
3179                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3180                 bg = &truebg;
3181         } else {
3182                 bg = &dc.col[base.bg];
3183         }
3184
3185         if(base.mode & ATTR_BOLD) {
3186                 if(BETWEEN(base.fg, 0, 7)) {
3187                         /* basic system colors */
3188                         fg = &dc.col[base.fg + 8];
3189                 } else if(BETWEEN(base.fg, 16, 195)) {
3190                         /* 256 colors */
3191                         fg = &dc.col[base.fg + 36];
3192                 } else if(BETWEEN(base.fg, 232, 251)) {
3193                         /* greyscale */
3194                         fg = &dc.col[base.fg + 4];
3195                 }
3196                 /*
3197                  * Those ranges will not be brightened:
3198                  *    8 - 15 – bright system colors
3199                  *    196 - 231 – highest 256 color cube
3200                  *    252 - 255 – brightest colors in greyscale
3201                  */
3202                 font = &dc.bfont;
3203                 frcflags = FRC_BOLD;
3204         }
3205
3206         if(IS_SET(MODE_REVERSE)) {
3207                 if(fg == &dc.col[defaultfg]) {
3208                         fg = &dc.col[defaultbg];
3209                 } else {
3210                         colfg.red = ~fg->color.red;
3211                         colfg.green = ~fg->color.green;
3212                         colfg.blue = ~fg->color.blue;
3213                         colfg.alpha = fg->color.alpha;
3214                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3215                                         &revfg);
3216                         fg = &revfg;
3217                 }
3218
3219                 if(bg == &dc.col[defaultbg]) {
3220                         bg = &dc.col[defaultfg];
3221                 } else {
3222                         colbg.red = ~bg->color.red;
3223                         colbg.green = ~bg->color.green;
3224                         colbg.blue = ~bg->color.blue;
3225                         colbg.alpha = bg->color.alpha;
3226                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3227                                         &revbg);
3228                         bg = &revbg;
3229                 }
3230         }
3231
3232         if(base.mode & ATTR_REVERSE) {
3233                 temp = fg;
3234                 fg = bg;
3235                 bg = temp;
3236         }
3237
3238         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3239                 fg = bg;
3240
3241         /* Intelligent cleaning up of the borders. */
3242         if(x == 0) {
3243                 xclear(0, (y == 0)? 0 : winy, borderpx,
3244                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3245         }
3246         if(x + charlen >= term.col) {
3247                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3248                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3249         }
3250         if(y == 0)
3251                 xclear(winx, 0, winx + width, borderpx);
3252         if(y == term.row-1)
3253                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3254
3255         /* Clean up the region we want to draw to. */
3256         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3257
3258         /* Set the clip region because Xft is sometimes dirty. */
3259         r.x = 0;
3260         r.y = 0;
3261         r.height = xw.ch;
3262         r.width = width;
3263         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3264
3265         for(xp = winx; bytelen > 0;) {
3266                 /*
3267                  * Search for the range in the to be printed string of glyphs
3268                  * that are in the main font. Then print that range. If
3269                  * some glyph is found that is not in the font, do the
3270                  * fallback dance.
3271                  */
3272                 u8fs = s;
3273                 u8fblen = 0;
3274                 u8fl = 0;
3275                 oneatatime = font->width != xw.cw;
3276                 for(;;) {
3277                         u8c = s;
3278                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3279                         s += u8cblen;
3280                         bytelen -= u8cblen;
3281
3282                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3283                         if(oneatatime || !doesexist || bytelen <= 0) {
3284                                 if(oneatatime || bytelen <= 0) {
3285                                         if(doesexist) {
3286                                                 u8fl++;
3287                                                 u8fblen += u8cblen;
3288                                         }
3289                                 }
3290
3291                                 if(u8fl > 0) {
3292                                         XftDrawStringUtf8(xw.draw, fg,
3293                                                         font->match, xp,
3294                                                         winy + font->ascent,
3295                                                         (FcChar8 *)u8fs,
3296                                                         u8fblen);
3297                                         xp += xw.cw * u8fl;
3298
3299                                 }
3300                                 break;
3301                         }
3302
3303                         u8fl++;
3304                         u8fblen += u8cblen;
3305                 }
3306                 if(doesexist) {
3307                         if(oneatatime)
3308                                 continue;
3309                         break;
3310                 }
3311
3312                 /* Search the font cache. */
3313                 for(i = 0; i < frclen; i++) {
3314                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3315                                         && frc[i].flags == frcflags) {
3316                                 break;
3317                         }
3318                 }
3319
3320                 /* Nothing was found. */
3321                 if(i >= frclen) {
3322                         if(!font->set)
3323                                 xloadfontset(font);
3324                         fcsets[0] = font->set;
3325
3326                         /*
3327                          * Nothing was found in the cache. Now use
3328                          * some dozen of Fontconfig calls to get the
3329                          * font for one single character.
3330                          *
3331                          * Xft and fontconfig are design failures.
3332                          */
3333                         fcpattern = FcPatternDuplicate(font->pattern);
3334                         fccharset = FcCharSetCreate();
3335
3336                         FcCharSetAddChar(fccharset, unicodep);
3337                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3338                                         fccharset);
3339                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3340                                         FcTrue);
3341
3342                         FcConfigSubstitute(0, fcpattern,
3343                                         FcMatchPattern);
3344                         FcDefaultSubstitute(fcpattern);
3345
3346                         fontpattern = FcFontSetMatch(0, fcsets,
3347                                         FcTrue, fcpattern, &fcres);
3348
3349                         /*
3350                          * Overwrite or create the new cache entry.
3351                          */
3352                         if(frclen >= LEN(frc)) {
3353                                 frclen = LEN(frc) - 1;
3354                                 XftFontClose(xw.dpy, frc[frclen].font);
3355                         }
3356
3357                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3358                                         fontpattern);
3359                         frc[frclen].flags = frcflags;
3360
3361                         i = frclen;
3362                         frclen++;
3363
3364                         FcPatternDestroy(fcpattern);
3365                         FcCharSetDestroy(fccharset);
3366                 }
3367
3368                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3369                                 xp, winy + frc[i].font->ascent,
3370                                 (FcChar8 *)u8c, u8cblen);
3371
3372                 xp += xw.cw * wcwidth(unicodep);
3373         }
3374
3375         /*
3376          * This is how the loop above actually should be. Why does the
3377          * application have to care about font details?
3378          *
3379          * I have to repeat: Xft and Fontconfig are design failures.
3380          */
3381         /*
3382         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3383                         winy + font->ascent, (FcChar8 *)s, bytelen);
3384         */
3385
3386         if(base.mode & ATTR_UNDERLINE) {
3387                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3388                                 width, 1);
3389         }
3390
3391         /* Reset clip to none. */
3392         XftDrawSetClip(xw.draw, 0);
3393 }
3394
3395 void
3396 xdrawcursor(void) {
3397         static int oldx = 0, oldy = 0;
3398         int sl, width, curx;
3399         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3400
3401         LIMIT(oldx, 0, term.col-1);
3402         LIMIT(oldy, 0, term.row-1);
3403
3404         curx = term.c.x;
3405
3406         /* adjust position if in dummy */
3407         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3408                 oldx--;
3409         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3410                 curx--;
3411
3412         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3413
3414         /* remove the old cursor */
3415         sl = utf8len(term.line[oldy][oldx].c);
3416         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3417         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3418                         oldy, width, sl);
3419
3420         /* draw the new one */
3421         if(!(IS_SET(MODE_HIDE))) {
3422                 if(xw.state & WIN_FOCUSED) {
3423                         if(IS_SET(MODE_REVERSE)) {
3424                                 g.mode |= ATTR_REVERSE;
3425                                 g.fg = defaultcs;
3426                                 g.bg = defaultfg;
3427                         }
3428
3429                         sl = utf8len(g.c);
3430                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3431                                 ? 2 : 1;
3432                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3433                 } else {
3434                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3435                                         borderpx + curx * xw.cw,
3436                                         borderpx + term.c.y * xw.ch,
3437                                         xw.cw - 1, 1);
3438                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3439                                         borderpx + curx * xw.cw,
3440                                         borderpx + term.c.y * xw.ch,
3441                                         1, xw.ch - 1);
3442                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3443                                         borderpx + (curx + 1) * xw.cw - 1,
3444                                         borderpx + term.c.y * xw.ch,
3445                                         1, xw.ch - 1);
3446                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3447                                         borderpx + curx * xw.cw,
3448                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3449                                         xw.cw, 1);
3450                 }
3451                 oldx = curx, oldy = term.c.y;
3452         }
3453 }
3454
3455
3456 void
3457 xsettitle(char *p) {
3458         XTextProperty prop;
3459
3460         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3461                         &prop);
3462         XSetWMName(xw.dpy, xw.win, &prop);
3463         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3464         XFree(prop.value);
3465 }
3466
3467 void
3468 xresettitle(void) {
3469         xsettitle(opt_title ? opt_title : "st");
3470 }
3471
3472 void
3473 redraw(int timeout) {
3474         struct timespec tv = {0, timeout * 1000};
3475
3476         draw();
3477
3478         if(timeout > 0) {
3479                 nanosleep(&tv, NULL);
3480                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3481         }
3482 }
3483
3484 void
3485 draw(void) {
3486         drawregion(0, 0, term.col, term.row);
3487         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3488                         xw.h, 0, 0);
3489         XSetForeground(xw.dpy, dc.gc,
3490                         dc.col[IS_SET(MODE_REVERSE)?
3491                                 defaultfg : defaultbg].pixel);
3492 }
3493
3494 void
3495 drawregion(int x1, int y1, int x2, int y2) {
3496         int ic, ib, x, y, ox, sl;
3497         Glyph base, new;
3498         char buf[DRAW_BUF_SIZ];
3499         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3500         long unicodep;
3501
3502         if(!(xw.state & WIN_VISIBLE))
3503                 return;
3504
3505         for(y = y1; y < y2; y++) {
3506                 if(!term.dirty[y])
3507                         continue;
3508
3509                 xtermclear(0, y, term.col, y);
3510                 term.dirty[y] = 0;
3511                 base = term.line[y][0];
3512                 ic = ib = ox = 0;
3513                 for(x = x1; x < x2; x++) {
3514                         new = term.line[y][x];
3515                         if(new.mode == ATTR_WDUMMY)
3516                                 continue;
3517                         if(ena_sel && selected(x, y))
3518                                 new.mode ^= ATTR_REVERSE;
3519                         if(ib > 0 && (ATTRCMP(base, new)
3520                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3521                                 xdraws(buf, base, ox, y, ic, ib);
3522                                 ic = ib = 0;
3523                         }
3524                         if(ib == 0) {
3525                                 ox = x;
3526                                 base = new;
3527                         }
3528
3529                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3530                         memcpy(buf+ib, new.c, sl);
3531                         ib += sl;
3532                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3533                 }
3534                 if(ib > 0)
3535                         xdraws(buf, base, ox, y, ic, ib);
3536         }
3537         xdrawcursor();
3538 }
3539
3540 void
3541 expose(XEvent *ev) {
3542         XExposeEvent *e = &ev->xexpose;
3543
3544         if(xw.state & WIN_REDRAW) {
3545                 if(!e->count)
3546                         xw.state &= ~WIN_REDRAW;
3547         }
3548         redraw(0);
3549 }
3550
3551 void
3552 visibility(XEvent *ev) {
3553         XVisibilityEvent *e = &ev->xvisibility;
3554
3555         if(e->state == VisibilityFullyObscured) {
3556                 xw.state &= ~WIN_VISIBLE;
3557         } else if(!(xw.state & WIN_VISIBLE)) {
3558                 /* need a full redraw for next Expose, not just a buf copy */
3559                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3560         }
3561 }
3562
3563 void
3564 unmap(XEvent *ev) {
3565         xw.state &= ~WIN_VISIBLE;
3566 }
3567
3568 void
3569 xsetpointermotion(int set) {
3570         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3571         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3572 }
3573
3574 void
3575 xseturgency(int add) {
3576         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3577
3578         MODBIT(h->flags, add, XUrgencyHint);
3579         XSetWMHints(xw.dpy, xw.win, h);
3580         XFree(h);
3581 }
3582
3583 void
3584 focus(XEvent *ev) {
3585         XFocusChangeEvent *e = &ev->xfocus;
3586
3587         if(e->mode == NotifyGrab)
3588                 return;
3589
3590         if(ev->type == FocusIn) {
3591                 XSetICFocus(xw.xic);
3592                 xw.state |= WIN_FOCUSED;
3593                 xseturgency(0);
3594                 if(IS_SET(MODE_FOCUS))
3595                         ttywrite("\033[I", 3);
3596         } else {
3597                 XUnsetICFocus(xw.xic);
3598                 xw.state &= ~WIN_FOCUSED;
3599                 if(IS_SET(MODE_FOCUS))
3600                         ttywrite("\033[O", 3);
3601         }
3602 }
3603
3604 static inline bool
3605 match(uint mask, uint state) {
3606         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3607 }
3608
3609 void
3610 numlock(const Arg *dummy) {
3611         term.numlock ^= 1;
3612 }
3613
3614 char*
3615 kmap(KeySym k, uint state) {
3616         Key *kp;
3617         int i;
3618
3619         /* Check for mapped keys out of X11 function keys. */
3620         for(i = 0; i < LEN(mappedkeys); i++) {
3621                 if(mappedkeys[i] == k)
3622                         break;
3623         }
3624         if(i == LEN(mappedkeys)) {
3625                 if((k & 0xFFFF) < 0xFD00)
3626                         return NULL;
3627         }
3628
3629         for(kp = key; kp < key + LEN(key); kp++) {
3630                 if(kp->k != k)
3631                         continue;
3632
3633                 if(!match(kp->mask, state))
3634                         continue;
3635
3636                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3637                         continue;
3638                 if(term.numlock && kp->appkey == 2)
3639                         continue;
3640
3641                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3642                         continue;
3643
3644                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3645                         continue;
3646
3647                 return kp->s;
3648         }
3649
3650         return NULL;
3651 }
3652
3653 void
3654 kpress(XEvent *ev) {
3655         XKeyEvent *e = &ev->xkey;
3656         KeySym ksym;
3657         char buf[32], *customkey;
3658         int len;
3659         long c;
3660         Status status;
3661         Shortcut *bp;
3662
3663         if(IS_SET(MODE_KBDLOCK))
3664                 return;
3665
3666         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3667         /* 1. shortcuts */
3668         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3669                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3670                         bp->func(&(bp->arg));
3671                         return;
3672                 }
3673         }
3674
3675         /* 2. custom keys from config.h */
3676         if((customkey = kmap(ksym, e->state))) {
3677                 ttysend(customkey, strlen(customkey));
3678                 return;
3679         }
3680
3681         /* 3. composed string from input method */
3682         if(len == 0)
3683                 return;
3684         if(len == 1 && e->state & Mod1Mask) {
3685                 if(IS_SET(MODE_8BIT)) {
3686                         if(*buf < 0177) {
3687                                 c = *buf | 0x80;
3688                                 len = utf8encode(c, buf, UTF_SIZ);
3689                         }
3690                 } else {
3691                         buf[1] = buf[0];
3692                         buf[0] = '\033';
3693                         len = 2;
3694                 }
3695         }
3696         ttysend(buf, len);
3697 }
3698
3699
3700 void
3701 cmessage(XEvent *e) {
3702         /*
3703          * See xembed specs
3704          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3705          */
3706         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3707                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3708                         xw.state |= WIN_FOCUSED;
3709                         xseturgency(0);
3710                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3711                         xw.state &= ~WIN_FOCUSED;
3712                 }
3713         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3714                 /* Send SIGHUP to shell */
3715                 kill(pid, SIGHUP);
3716                 exit(EXIT_SUCCESS);
3717         }
3718 }
3719
3720 void
3721 cresize(int width, int height) {
3722         int col, row;
3723
3724         if(width != 0)
3725                 xw.w = width;
3726         if(height != 0)
3727                 xw.h = height;
3728
3729         col = (xw.w - 2 * borderpx) / xw.cw;
3730         row = (xw.h - 2 * borderpx) / xw.ch;
3731
3732         tresize(col, row);
3733         xresize(col, row);
3734         ttyresize();
3735 }
3736
3737 void
3738 resize(XEvent *e) {
3739         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3740                 return;
3741
3742         cresize(e->xconfigure.width, e->xconfigure.height);
3743 }
3744
3745 void
3746 run(void) {
3747         XEvent ev;
3748         int w = xw.w, h = xw.h;
3749         fd_set rfd;
3750         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3751         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3752
3753         /* Waiting for window mapping */
3754         while(1) {
3755                 XNextEvent(xw.dpy, &ev);
3756                 if(ev.type == ConfigureNotify) {
3757                         w = ev.xconfigure.width;
3758                         h = ev.xconfigure.height;
3759                 } else if(ev.type == MapNotify) {
3760                         break;
3761                 }
3762         }
3763
3764         ttynew();
3765         cresize(w, h);
3766
3767         gettimeofday(&last, NULL);
3768         lastblink = last;
3769
3770         for(xev = actionfps;;) {
3771                 long deltatime;
3772
3773                 FD_ZERO(&rfd);
3774                 FD_SET(cmdfd, &rfd);
3775                 FD_SET(xfd, &rfd);
3776
3777                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3778                         if(errno == EINTR)
3779                                 continue;
3780                         die("select failed: %s\n", strerror(errno));
3781                 }
3782                 if(FD_ISSET(cmdfd, &rfd)) {
3783                         ttyread();
3784                         if(blinktimeout) {
3785                                 blinkset = tattrset(ATTR_BLINK);
3786                                 if(!blinkset)
3787                                         MODBIT(term.mode, 0, MODE_BLINK);
3788                         }
3789                 }
3790
3791                 if(FD_ISSET(xfd, &rfd))
3792                         xev = actionfps;
3793
3794                 gettimeofday(&now, NULL);
3795                 drawtimeout.tv_sec = 0;
3796                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3797                 tv = &drawtimeout;
3798
3799                 dodraw = 0;
3800                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3801                         tsetdirtattr(ATTR_BLINK);
3802                         term.mode ^= MODE_BLINK;
3803                         lastblink = now;
3804                         dodraw = 1;
3805                 }
3806                 deltatime = TIMEDIFF(now, last);
3807                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3808                                 || deltatime < 0) {
3809                         dodraw = 1;
3810                         last = now;
3811                 }
3812
3813                 if(dodraw) {
3814                         while(XPending(xw.dpy)) {
3815                                 XNextEvent(xw.dpy, &ev);
3816                                 if(XFilterEvent(&ev, None))
3817                                         continue;
3818                                 if(handler[ev.type])
3819                                         (handler[ev.type])(&ev);
3820                         }
3821
3822                         draw();
3823                         XFlush(xw.dpy);
3824
3825                         if(xev && !FD_ISSET(xfd, &rfd))
3826                                 xev--;
3827                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3828                                 if(blinkset) {
3829                                         if(TIMEDIFF(now, lastblink) \
3830                                                         > blinktimeout) {
3831                                                 drawtimeout.tv_usec = 1;
3832                                         } else {
3833                                                 drawtimeout.tv_usec = (1000 * \
3834                                                         (blinktimeout - \
3835                                                         TIMEDIFF(now,
3836                                                                 lastblink)));
3837                                         }
3838                                 } else {
3839                                         tv = NULL;
3840                                 }
3841                         }
3842                 }
3843         }
3844 }
3845
3846 void
3847 usage(void) {
3848         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3849         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3850         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3851 }
3852
3853 int
3854 main(int argc, char *argv[]) {
3855         char *titles;
3856         uint cols = 80, rows = 24;
3857
3858         xw.l = xw.t = 0;
3859         xw.isfixed = False;
3860
3861         ARGBEGIN {
3862         case 'a':
3863                 allowaltscreen = false;
3864                 break;
3865         case 'c':
3866                 opt_class = EARGF(usage());
3867                 break;
3868         case 'e':
3869                 /* eat all remaining arguments */
3870                 if(argc > 1) {
3871                         opt_cmd = &argv[1];
3872                         if(argv[1] != NULL && opt_title == NULL) {
3873                                 titles = xstrdup(argv[1]);
3874                                 opt_title = basename(titles);
3875                         }
3876                 }
3877                 goto run;
3878         case 'f':
3879                 opt_font = EARGF(usage());
3880                 break;
3881         case 'g':
3882                 xw.gm = XParseGeometry(EARGF(usage()),
3883                                 &xw.l, &xw.t, &cols, &rows);
3884                 break;
3885         case 'i':
3886                 xw.isfixed = True;
3887                 break;
3888         case 'o':
3889                 opt_io = EARGF(usage());
3890                 break;
3891         case 't':
3892                 opt_title = EARGF(usage());
3893                 break;
3894         case 'w':
3895                 opt_embed = EARGF(usage());
3896                 break;
3897         case 'v':
3898         default:
3899                 usage();
3900         } ARGEND;
3901
3902 run:
3903         setlocale(LC_CTYPE, "");
3904         XSetLocaleModifiers("");
3905         tnew(cols? cols : 1, rows? rows : 1);
3906         xinit();
3907         selinit();
3908         run();
3909
3910         return 0;
3911 }
3912