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