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) || (c) == '\177')
  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_nsec-t2.tv_nsec)/1E6)
  80 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  81
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_BOLD      = 1,
  92         ATTR_FAINT     = 2,
  93         ATTR_ITALIC    = 4,
  94         ATTR_UNDERLINE = 8,
  95         ATTR_BLINK     = 16,
  96         ATTR_REVERSE   = 32,
  97         ATTR_INVISIBLE = 64,
  98         ATTR_STRUCK    = 128,
  99         ATTR_WRAP      = 256,
 100         ATTR_WIDE      = 512,
 101         ATTR_WDUMMY    = 1024,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1,
 117         MODE_INSERT      = 2,
 118         MODE_APPKEYPAD   = 4,
 119         MODE_ALTSCREEN   = 8,
 120         MODE_CRLF        = 16,
 121         MODE_MOUSEBTN    = 32,
 122         MODE_MOUSEMOTION = 64,
 123         MODE_REVERSE     = 128,
 124         MODE_KBDLOCK     = 256,
 125         MODE_HIDE        = 512,
 126         MODE_ECHO        = 1024,
 127         MODE_APPCURSOR   = 2048,
 128         MODE_MOUSESGR    = 4096,
 129         MODE_8BIT        = 8192,
 130         MODE_BLINK       = 16384,
 131         MODE_FBLINK      = 32768,
 132         MODE_FOCUS       = 65536,
 133         MODE_MOUSEX10    = 131072,
 134         MODE_MOUSEMANY   = 262144,
 135         MODE_BRCKTPASTE  = 524288,
 136         MODE_PRINT       = 1048576,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Color;
 183
 184 typedef struct {
 185         char c[UTF_SIZ]; /* character code */
 186         ushort mode;      /* attribute flags */
 187         uint32_t fg;      /* foreground  */
 188         uint32_t bg;      /* background  */
 189 } Glyph;
 190
 191 typedef Glyph *Line;
 192
 193 typedef struct {
 194         Glyph attr; /* current char attributes */
 195         int x;
 196         int y;
 197         char state;
 198 } TCursor;
 199
 200 /* CSI Escape sequence structs */
 201 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 202 typedef struct {
 203         char buf[ESC_BUF_SIZ]; /* raw string */
 204         int len;               /* raw string length */
 205         char priv;
 206         int arg[ESC_ARG_SIZ];
 207         int narg;              /* nb of args */
 208         char mode;
 209 } CSIEscape;
 210
 211 /* STR Escape sequence structs */
 212 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 213 typedef struct {
 214         char type;             /* ESC type ... */
 215         char buf[STR_BUF_SIZ]; /* raw string */
 216         int len;               /* raw string length */
 217         char *args[STR_ARG_SIZ];
 218         int narg;              /* nb of args */
 219 } STREscape;
 220
 221 /* Internal representation of the screen */
 222 typedef struct {
 223         int row;      /* nb row */
 224         int col;      /* nb col */
 225         Line *line;   /* screen */
 226         Line *alt;    /* alternate screen */
 227         bool *dirty;  /* dirtyness of lines */
 228         TCursor c;    /* cursor */
 229         int top;      /* top    scroll limit */
 230         int bot;      /* bottom scroll limit */
 231         int mode;     /* terminal mode flags */
 232         int esc;      /* escape state flags */
 233         char trantbl[4]; /* charset table translation */
 234         int charset;  /* current charset */
 235         int icharset; /* selected charset for sequence */
 236         bool numlock; /* lock numbers in keyboard */
 237         bool *tabs;
 238 } Term;
 239
 240 /* Purely graphic info */
 241 typedef struct {
 242         Display *dpy;
 243         Colormap cmap;
 244         Window win;
 245         Drawable buf;
 246         Atom xembed, wmdeletewin, netwmname, netwmpid;
 247         XIM xim;
 248         XIC xic;
 249         Draw draw;
 250         Visual *vis;
 251         XSetWindowAttributes attrs;
 252         int scr;
 253         bool isfixed; /* is fixed geometry? */
 254         int l, t; /* left and top offset */
 255         int gm; /* geometry mask */
 256         int tw, th; /* tty width and height */
 257         int w, h; /* window width and height */
 258         int ch; /* char height */
 259         int cw; /* char width  */
 260         char state; /* focus, redraw, visible */
 261 } XWindow;
 262
 263 typedef struct {
 264         uint b;
 265         uint mask;
 266         char *s;
 267 } Mousekey;
 268
 269 typedef struct {
 270         KeySym k;
 271         uint mask;
 272         char *s;
 273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 274         signed char appkey;    /* application keypad */
 275         signed char appcursor; /* application cursor */
 276         signed char crlf;      /* crlf mode          */
 277 } Key;
 278
 279 typedef struct {
 280         int mode;
 281         int type;
 282         int snap;
 283         /*
 284          * Selection variables:
 285          * nb – normalized coordinates of the beginning of the selection
 286          * ne – normalized coordinates of the end of the selection
 287          * ob – original coordinates of the beginning of the selection
 288          * oe – original coordinates of the end of the selection
 289          */
 290         struct {
 291                 int x, y;
 292         } nb, ne, ob, oe;
 293
 294         char *clip;
 295         Atom xtarget;
 296         bool alt;
 297         struct timespec tclick1;
 298         struct timespec tclick2;
 299 } Selection;
 300
 301 typedef union {
 302         int i;
 303         uint ui;
 304         float f;
 305         const void *v;
 306 } Arg;
 307
 308 typedef struct {
 309         uint mod;
 310         KeySym keysym;
 311         void (*func)(const Arg *);
 312         const Arg arg;
 313 } Shortcut;
 314
 315 /* function definitions used in config.h */
 316 static void clippaste(const Arg *);
 317 static void numlock(const Arg *);
 318 static void selpaste(const Arg *);
 319 static void xzoom(const Arg *);
 320 static void printsel(const Arg *);
 321 static void printscreen(const Arg *) ;
 322 static void toggleprinter(const Arg *);
 323
 324 /* Config.h for applying patches and the configuration. */
 325 #include "config.h"
 326
 327 /* Font structure */
 328 typedef struct {
 329         int height;
 330         int width;
 331         int ascent;
 332         int descent;
 333         short lbearing;
 334         short rbearing;
 335         XftFont *match;
 336         FcFontSet *set;
 337         FcPattern *pattern;
 338 } Font;
 339
 340 /* Drawing Context */
 341 typedef struct {
 342         Color col[MAX(LEN(colorname), 256)];
 343         Font font, bfont, ifont, ibfont;
 344         GC gc;
 345 } DC;
 346
 347 static void die(const char *, ...);
 348 static void draw(void);
 349 static void redraw(int);
 350 static void drawregion(int, int, int, int);
 351 static void execsh(void);
 352 static void sigchld(int);
 353 static void run(void);
 354
 355 static void csidump(void);
 356 static void csihandle(void);
 357 static void csiparse(void);
 358 static void csireset(void);
 359 static int eschandle(uchar ascii);
 360 static void strdump(void);
 361 static void strhandle(void);
 362 static void strparse(void);
 363 static void strreset(void);
 364
 365 static int tattrset(int);
 366 static void tprinter(char *, size_t);
 367 static void tdumpsel(void);
 368 static void tdumpline(int);
 369 static void tdump(void);
 370 static void tclearregion(int, int, int, int);
 371 static void tcursor(int);
 372 static void tdeletechar(int);
 373 static void tdeleteline(int);
 374 static void tinsertblank(int);
 375 static void tinsertblankline(int);
 376 static int tlinelen(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 void 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 void tcontrolcode(uchar );
 397 static void tdectest(char );
 398 static int32_t tdefcolor(int *, int *, int);
 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 static void tstrsequence(uchar c);
 407
 408 static void xdraws(char *, Glyph, int, int, int, int);
 409 static void xhints(void);
 410 static void xclear(int, int, int, int);
 411 static void xdrawcursor(void);
 412 static void xinit(void);
 413 static void xloadcols(void);
 414 static int xsetcolorname(int, const char *);
 415 static int xgeommasktogravity(int);
 416 static int xloadfont(Font *, FcPattern *);
 417 static void xloadfonts(char *, double);
 418 static int xloadfontset(Font *);
 419 static void xsettitle(char *);
 420 static void xresettitle(void);
 421 static void xsetpointermotion(int);
 422 static void xseturgency(int);
 423 static void xsetsel(char *);
 424 static void xtermclear(int, int, int, int);
 425 static void xunloadfont(Font *);
 426 static void xunloadfonts(void);
 427 static void xresize(int, int);
 428
 429 static void expose(XEvent *);
 430 static void visibility(XEvent *);
 431 static void unmap(XEvent *);
 432 static char *kmap(KeySym, uint);
 433 static void kpress(XEvent *);
 434 static void cmessage(XEvent *);
 435 static void cresize(int, int);
 436 static void resize(XEvent *);
 437 static void focus(XEvent *);
 438 static void brelease(XEvent *);
 439 static void bpress(XEvent *);
 440 static void bmotion(XEvent *);
 441 static void selnotify(XEvent *);
 442 static void selclear(XEvent *);
 443 static void selrequest(XEvent *);
 444
 445 static void selinit(void);
 446 static void selnormalize(void);
 447 static inline bool selected(int, int);
 448 static char *getsel(void);
 449 static void selcopy(void);
 450 static void selscroll(int, int);
 451 static void selsnap(int, int *, int *, int);
 452 static void getbuttoninfo(XEvent *);
 453 static void mousereport(XEvent *);
 454
 455 static size_t utf8decode(char *, long *, size_t);
 456 static long utf8decodebyte(char, size_t *);
 457 static size_t utf8encode(long, char *, size_t);
 458 static char utf8encodebyte(long, size_t);
 459 static size_t utf8len(char *);
 460 static size_t utf8validate(long *, size_t);
 461
 462 static ssize_t xwrite(int, const char *, size_t);
 463 static void *xmalloc(size_t);
 464 static void *xrealloc(void *, size_t);
 465 static char *xstrdup(char *);
 466
 467 static void usage(void);
 468
 469 static void (*handler[LASTEvent])(XEvent *) = {
 470         [KeyPress] = kpress,
 471         [ClientMessage] = cmessage,
 472         [ConfigureNotify] = resize,
 473         [VisibilityNotify] = visibility,
 474         [UnmapNotify] = unmap,
 475         [Expose] = expose,
 476         [FocusIn] = focus,
 477         [FocusOut] = focus,
 478         [MotionNotify] = bmotion,
 479         [ButtonPress] = bpress,
 480         [ButtonRelease] = brelease,
 481         [SelectionClear] = selclear,
 482         [SelectionNotify] = selnotify,
 483         [SelectionRequest] = selrequest,
 484 };
 485
 486 /* Globals */
 487 static DC dc;
 488 static XWindow xw;
 489 static Term term;
 490 static CSIEscape csiescseq;
 491 static STREscape strescseq;
 492 static int cmdfd;
 493 static pid_t pid;
 494 static Selection sel;
 495 static int iofd = STDOUT_FILENO;
 496 static char **opt_cmd = NULL;
 497 static char *opt_io = NULL;
 498 static char *opt_title = NULL;
 499 static char *opt_embed = NULL;
 500 static char *opt_class = NULL;
 501 static char *opt_font = NULL;
 502 static int oldbutton = 3; /* button event on startup: 3 = release */
 503
 504 static char *usedfont = NULL;
 505 static double usedfontsize = 0;
 506
 507 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 508 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 509 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 510 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 511
 512 /* Font Ring Cache */
 513 enum {
 514         FRC_NORMAL,
 515         FRC_ITALIC,
 516         FRC_BOLD,
 517         FRC_ITALICBOLD
 518 };
 519
 520 typedef struct {
 521         XftFont *font;
 522         int flags;
 523 } Fontcache;
 524
 525 /* Fontcache is an array now. A new font will be appended to the array. */
 526 static Fontcache frc[16];
 527 static int frclen = 0;
 528
 529 ssize_t
 530 xwrite(int fd, const char *s, size_t len) {
 531         size_t aux = len;
 532
 533         while(len > 0) {
 534                 ssize_t r = write(fd, s, len);
 535                 if(r < 0)
 536                         return r;
 537                 len -= r;
 538                 s += r;
 539         }
 540         return aux;
 541 }
 542
 543 void *
 544 xmalloc(size_t len) {
 545         void *p = malloc(len);
 546
 547         if(!p)
 548                 die("Out of memory\n");
 549
 550         return p;
 551 }
 552
 553 void *
 554 xrealloc(void *p, size_t len) {
 555         if((p = realloc(p, len)) == NULL)
 556                 die("Out of memory\n");
 557
 558         return p;
 559 }
 560
 561 char *
 562 xstrdup(char *s) {
 563         if((s = strdup(s)) == NULL)
 564                 die("Out of memory\n");
 565
 566         return s;
 567 }
 568
 569 size_t
 570 utf8decode(char *c, long *u, size_t clen) {
 571         size_t i, j, len, type;
 572         long udecoded;
 573
 574         *u = UTF_INVALID;
 575         if(!clen)
 576                 return 0;
 577         udecoded = utf8decodebyte(c[0], &len);
 578         if(!BETWEEN(len, 1, UTF_SIZ))
 579                 return 1;
 580         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 581                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 582                 if(type != 0)
 583                         return j;
 584         }
 585         if(j < len)
 586                 return 0;
 587         *u = udecoded;
 588         utf8validate(u, len);
 589         return len;
 590 }
 591
 592 long
 593 utf8decodebyte(char c, size_t *i) {
 594         for(*i = 0; *i < LEN(utfmask); ++(*i))
 595                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 596                         return (uchar)c & ~utfmask[*i];
 597         return 0;
 598 }
 599
 600 size_t
 601 utf8encode(long u, char *c, size_t clen) {
 602         size_t len, i;
 603
 604         len = utf8validate(&u, 0);
 605         if(clen < len)
 606                 return 0;
 607         for(i = len - 1; i != 0; --i) {
 608                 c[i] = utf8encodebyte(u, 0);
 609                 u >>= 6;
 610         }
 611         c[0] = utf8encodebyte(u, len);
 612         return len;
 613 }
 614
 615 char
 616 utf8encodebyte(long u, size_t i) {
 617         return utfbyte[i] | (u & ~utfmask[i]);
 618 }
 619
 620 size_t
 621 utf8len(char *c) {
 622         return utf8decode(c, &(long){0}, UTF_SIZ);
 623 }
 624
 625 size_t
 626 utf8validate(long *u, size_t i) {
 627         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 628                 *u = UTF_INVALID;
 629         for(i = 1; *u > utfmax[i]; ++i)
 630                 ;
 631         return i;
 632 }
 633
 634 static void
 635 selinit(void) {
 636         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 637         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 638         sel.mode = 0;
 639         sel.ob.x = -1;
 640         sel.clip = NULL;
 641         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 642         if(sel.xtarget == None)
 643                 sel.xtarget = XA_STRING;
 644 }
 645
 646 static int
 647 x2col(int x) {
 648         x -= borderpx;
 649         x /= xw.cw;
 650
 651         return LIMIT(x, 0, term.col-1);
 652 }
 653
 654 static int
 655 y2row(int y) {
 656         y -= borderpx;
 657         y /= xw.ch;
 658
 659         return LIMIT(y, 0, term.row-1);
 660 }
 661
 662 static int tlinelen(int y) {
 663         int i = term.col;
 664
 665         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 666                 --i;
 667
 668         return i;
 669 }
 670
 671 static void
 672 selnormalize(void) {
 673         int i;
 674
 675         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 676                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 677                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 678         } else {
 679                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 680                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 681         }
 682         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 683         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 684
 685         /* expand selection over line breaks */
 686         if (sel.type == SEL_RECTANGULAR)
 687                 return;
 688         i = tlinelen(sel.nb.y);
 689         if (i < sel.nb.x)
 690                 sel.nb.x = i;
 691         if (tlinelen(sel.ne.y) <= sel.ne.x)
 692                 sel.ne.x = term.col - 1;
 693 }
 694
 695 static inline bool
 696 selected(int x, int y) {
 697         if(sel.type == SEL_RECTANGULAR)
 698                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 699                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 700
 701         return BETWEEN(y, sel.nb.y, sel.ne.y)
 702             && (y != sel.nb.y || x >= sel.nb.x)
 703             && (y != sel.ne.y || x <= sel.ne.x);
 704 }
 705
 706 void
 707 selsnap(int mode, int *x, int *y, int direction) {
 708         int newx, newy, xt, yt;
 709         Glyph *gp;
 710
 711         switch(mode) {
 712         case SNAP_WORD:
 713                 /*
 714                  * Snap around if the word wraps around at the end or
 715                  * beginning of a line.
 716                  */
 717                 for(;;) {
 718                         newx = *x + direction;
 719                         newy = *y;
 720                         if(!BETWEEN(newx, 0, term.col - 1)) {
 721                                 newy += direction;
 722                                 newx = (newx + term.col) % term.col;
 723                                 if (!BETWEEN(newy, 0, term.row - 1))
 724                                         break;
 725
 726                                 if(direction > 0)
 727                                         yt = *y, xt = *x;
 728                                 else
 729                                         yt = newy, xt = newx;
 730                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 731                                         break;
 732                         }
 733
 734                         if (newx >= tlinelen(newy))
 735                                 break;
 736
 737                         gp = &term.line[newy][newx];
 738                         if (!(gp->mode & ATTR_WDUMMY) && strchr(worddelimiters, gp->c[0]))
 739                                 break;
 740
 741                         *x = newx;
 742                         *y = newy;
 743                 }
 744                 break;
 745         case SNAP_LINE:
 746                 /*
 747                  * Snap around if the the previous line or the current one
 748                  * has set ATTR_WRAP at its end. Then the whole next or
 749                  * previous line will be selected.
 750                  */
 751                 *x = (direction < 0) ? 0 : term.col - 1;
 752                 if(direction < 0 && *y > 0) {
 753                         for(; *y > 0; *y += direction) {
 754                                 if(!(term.line[*y-1][term.col-1].mode
 755                                                 & ATTR_WRAP)) {
 756                                         break;
 757                                 }
 758                         }
 759                 } else if(direction > 0 && *y < term.row-1) {
 760                         for(; *y < term.row; *y += direction) {
 761                                 if(!(term.line[*y][term.col-1].mode
 762                                                 & ATTR_WRAP)) {
 763                                         break;
 764                                 }
 765                         }
 766                 }
 767                 break;
 768         }
 769 }
 770
 771 void
 772 getbuttoninfo(XEvent *e) {
 773         int type;
 774         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 775
 776         sel.alt = IS_SET(MODE_ALTSCREEN);
 777
 778         sel.oe.x = x2col(e->xbutton.x);
 779         sel.oe.y = y2row(e->xbutton.y);
 780
 781         if(sel.ob.y < sel.oe.y
 782                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 783                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 784                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 785         } else {
 786                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 787                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 788         }
 789         selnormalize();
 790
 791         sel.type = SEL_REGULAR;
 792         for(type = 1; type < LEN(selmasks); ++type) {
 793                 if(match(selmasks[type], state)) {
 794                         sel.type = type;
 795                         break;
 796                 }
 797         }
 798 }
 799
 800 void
 801 mousereport(XEvent *e) {
 802         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 803             button = e->xbutton.button, state = e->xbutton.state,
 804             len;
 805         char buf[40];
 806         static int ox, oy;
 807
 808         /* from urxvt */
 809         if(e->xbutton.type == MotionNotify) {
 810                 if(x == ox && y == oy)
 811                         return;
 812                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 813                         return;
 814                 /* MOUSE_MOTION: no reporting if no button is pressed */
 815                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 816                         return;
 817
 818                 button = oldbutton + 32;
 819                 ox = x;
 820                 oy = y;
 821         } else {
 822                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 823                         button = 3;
 824                 } else {
 825                         button -= Button1;
 826                         if(button >= 3)
 827                                 button += 64 - 3;
 828                 }
 829                 if(e->xbutton.type == ButtonPress) {
 830                         oldbutton = button;
 831                         ox = x;
 832                         oy = y;
 833                 } else if(e->xbutton.type == ButtonRelease) {
 834                         oldbutton = 3;
 835                         /* MODE_MOUSEX10: no button release reporting */
 836                         if(IS_SET(MODE_MOUSEX10))
 837                                 return;
 838                         if (button == 64 || button == 65)
 839                                 return;
 840                 }
 841         }
 842
 843         if(!IS_SET(MODE_MOUSEX10)) {
 844                 button += (state & ShiftMask   ? 4  : 0)
 845                         + (state & Mod4Mask    ? 8  : 0)
 846                         + (state & ControlMask ? 16 : 0);
 847         }
 848
 849         len = 0;
 850         if(IS_SET(MODE_MOUSESGR)) {
 851                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 852                                 button, x+1, y+1,
 853                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 854         } else if(x < 223 && y < 223) {
 855                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 856                                 32+button, 32+x+1, 32+y+1);
 857         } else {
 858                 return;
 859         }
 860
 861         ttywrite(buf, len);
 862 }
 863
 864 void
 865 bpress(XEvent *e) {
 866         struct timespec now;
 867         Mousekey *mk;
 868
 869         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 870                 mousereport(e);
 871                 return;
 872         }
 873
 874         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 875                 if(e->xbutton.button == mk->b
 876                                 && match(mk->mask, e->xbutton.state)) {
 877                         ttysend(mk->s, strlen(mk->s));
 878                         return;
 879                 }
 880         }
 881
 882         if(e->xbutton.button == Button1) {
 883                 clock_gettime(CLOCK_MONOTONIC, &now);
 884
 885                 /* Clear previous selection, logically and visually. */
 886                 selclear(NULL);
 887                 sel.mode = 1;
 888                 sel.type = SEL_REGULAR;
 889                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 890                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 891
 892                 /*
 893                  * If the user clicks below predefined timeouts specific
 894                  * snapping behaviour is exposed.
 895                  */
 896                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 897                         sel.snap = SNAP_LINE;
 898                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 899                         sel.snap = SNAP_WORD;
 900                 } else {
 901                         sel.snap = 0;
 902                 }
 903                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 904                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 905                 selnormalize();
 906
 907                 /*
 908                  * Draw selection, unless it's regular and we don't want to
 909                  * make clicks visible
 910                  */
 911                 if(sel.snap != 0) {
 912                         sel.mode++;
 913                         tsetdirt(sel.nb.y, sel.ne.y);
 914                 }
 915                 sel.tclick2 = sel.tclick1;
 916                 sel.tclick1 = now;
 917         }
 918 }
 919
 920 char *
 921 getsel(void) {
 922         char *str, *ptr;
 923         int y, bufsize, size, lastx, linelen;
 924         Glyph *gp, *last;
 925
 926         if(sel.ob.x == -1)
 927                 return NULL;
 928
 929         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 930         ptr = str = xmalloc(bufsize);
 931
 932         /* append every set & selected glyph to the selection */
 933         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 934                 linelen = tlinelen(y);
 935
 936                 if(sel.type == SEL_RECTANGULAR) {
 937                         gp = &term.line[y][sel.nb.x];
 938                         lastx = sel.ne.x;
 939                 } else {
 940                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 941                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 942                 }
 943                 last = &term.line[y][MIN(lastx, linelen-1)];
 944
 945                 for( ; gp <= last; ++gp) {
 946                         if(gp->mode & ATTR_WDUMMY)
 947                                 continue;
 948
 949                         size = utf8len(gp->c);
 950                         memcpy(ptr, gp->c, size);
 951                         ptr += size;
 952                 }
 953
 954                 /*
 955                  * Copy and pasting of line endings is inconsistent
 956                  * in the inconsistent terminal and GUI world.
 957                  * The best solution seems like to produce '\n' when
 958                  * something is copied from st and convert '\n' to
 959                  * '\r', when something to be pasted is received by
 960                  * st.
 961                  * FIXME: Fix the computer world.
 962                  */
 963                 if(sel.ne.y > y || lastx >= linelen)
 964                         *ptr++ = '\n';
 965         }
 966         *ptr = 0;
 967         return str;
 968 }
 969
 970 void
 971 selcopy(void) {
 972         xsetsel(getsel());
 973 }
 974
 975 void
 976 selnotify(XEvent *e) {
 977         ulong nitems, ofs, rem;
 978         int format;
 979         uchar *data, *last, *repl;
 980         Atom type;
 981
 982         ofs = 0;
 983         do {
 984                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 985                                         False, AnyPropertyType, &type, &format,
 986                                         &nitems, &rem, &data)) {
 987                         fprintf(stderr, "Clipboard allocation failed\n");
 988                         return;
 989                 }
 990
 991                 /*
 992                  * As seen in getsel:
 993                  * Line endings are inconsistent in the terminal and GUI world
 994                  * copy and pasting. When receiving some selection data,
 995                  * replace all '\n' with '\r'.
 996                  * FIXME: Fix the computer world.
 997                  */
 998                 repl = data;
 999                 last = data + nitems * format / 8;
1000                 while((repl = memchr(repl, '\n', last - repl))) {
1001                         *repl++ = '\r';
1002                 }
1003
1004                 if(IS_SET(MODE_BRCKTPASTE))
1005                         ttywrite("\033[200~", 6);
1006                 ttysend((char *)data, nitems * format / 8);
1007                 if(IS_SET(MODE_BRCKTPASTE))
1008                         ttywrite("\033[201~", 6);
1009                 XFree(data);
1010                 /* number of 32-bit chunks returned */
1011                 ofs += nitems * format / 32;
1012         } while(rem > 0);
1013 }
1014
1015 void
1016 selpaste(const Arg *dummy) {
1017         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1018                         xw.win, CurrentTime);
1019 }
1020
1021 void
1022 clippaste(const Arg *dummy) {
1023         Atom clipboard;
1024
1025         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1026         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1027                         xw.win, CurrentTime);
1028 }
1029
1030 void
1031 selclear(XEvent *e) {
1032         if(sel.ob.x == -1)
1033                 return;
1034         sel.ob.x = -1;
1035         tsetdirt(sel.nb.y, sel.ne.y);
1036 }
1037
1038 void
1039 selrequest(XEvent *e) {
1040         XSelectionRequestEvent *xsre;
1041         XSelectionEvent xev;
1042         Atom xa_targets, string;
1043
1044         xsre = (XSelectionRequestEvent *) e;
1045         xev.type = SelectionNotify;
1046         xev.requestor = xsre->requestor;
1047         xev.selection = xsre->selection;
1048         xev.target = xsre->target;
1049         xev.time = xsre->time;
1050         /* reject */
1051         xev.property = None;
1052
1053         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1054         if(xsre->target == xa_targets) {
1055                 /* respond with the supported type */
1056                 string = sel.xtarget;
1057                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1058                                 XA_ATOM, 32, PropModeReplace,
1059                                 (uchar *) &string, 1);
1060                 xev.property = xsre->property;
1061         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1062                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1063                                 xsre->target, 8, PropModeReplace,
1064                                 (uchar *) sel.clip, strlen(sel.clip));
1065                 xev.property = xsre->property;
1066         }
1067
1068         /* all done, send a notification to the listener */
1069         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1070                 fprintf(stderr, "Error sending SelectionNotify event\n");
1071 }
1072
1073 void
1074 xsetsel(char *str) {
1075         /* register the selection for both the clipboard and the primary */
1076         Atom clipboard;
1077
1078         free(sel.clip);
1079         sel.clip = str;
1080
1081         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1082
1083         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1084         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1085 }
1086
1087 void
1088 brelease(XEvent *e) {
1089         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1090                 mousereport(e);
1091                 return;
1092         }
1093
1094         if(e->xbutton.button == Button2) {
1095                 selpaste(NULL);
1096         } else if(e->xbutton.button == Button1) {
1097                 if(sel.mode < 2) {
1098                         selclear(NULL);
1099                 } else {
1100                         getbuttoninfo(e);
1101                         selcopy();
1102                 }
1103                 sel.mode = 0;
1104                 tsetdirt(sel.nb.y, sel.ne.y);
1105         }
1106 }
1107
1108 void
1109 bmotion(XEvent *e) {
1110         int oldey, oldex, oldsby, oldsey;
1111
1112         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1113                 mousereport(e);
1114                 return;
1115         }
1116
1117         if(!sel.mode)
1118                 return;
1119
1120         sel.mode++;
1121         oldey = sel.oe.y;
1122         oldex = sel.oe.x;
1123         oldsby = sel.nb.y;
1124         oldsey = sel.ne.y;
1125         getbuttoninfo(e);
1126
1127         if(oldey != sel.oe.y || oldex != sel.oe.x)
1128                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1129 }
1130
1131 void
1132 die(const char *errstr, ...) {
1133         va_list ap;
1134
1135         va_start(ap, errstr);
1136         vfprintf(stderr, errstr, ap);
1137         va_end(ap);
1138         exit(EXIT_FAILURE);
1139 }
1140
1141 void
1142 execsh(void) {
1143         char **args, *sh;
1144         const struct passwd *pw;
1145         char buf[sizeof(long) * 8 + 1];
1146
1147         errno = 0;
1148         if((pw = getpwuid(getuid())) == NULL) {
1149                 if(errno)
1150                         die("getpwuid:%s\n", strerror(errno));
1151                 else
1152                         die("who are you?\n");
1153         }
1154         unsetenv("COLUMNS");
1155         unsetenv("LINES");
1156         unsetenv("TERMCAP");
1157
1158         sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1159         snprintf(buf, sizeof(buf), "%lu", xw.win);
1160
1161         setenv("LOGNAME", pw->pw_name, 1);
1162         setenv("USER", pw->pw_name, 1);
1163         setenv("SHELL", sh, 1);
1164         setenv("HOME", pw->pw_dir, 1);
1165         setenv("TERM", termname, 1);
1166         setenv("WINDOWID", buf, 1);
1167
1168         signal(SIGCHLD, SIG_DFL);
1169         signal(SIGHUP, SIG_DFL);
1170         signal(SIGINT, SIG_DFL);
1171         signal(SIGQUIT, SIG_DFL);
1172         signal(SIGTERM, SIG_DFL);
1173         signal(SIGALRM, SIG_DFL);
1174
1175         args = opt_cmd ? opt_cmd : (char *[]){sh, "-i", NULL};
1176         execvp(args[0], args);
1177         exit(EXIT_FAILURE);
1178 }
1179
1180 void
1181 sigchld(int a) {
1182         int stat, ret;
1183
1184         if(waitpid(pid, &stat, 0) < 0)
1185                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1186
1187         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1188         if (ret != EXIT_SUCCESS)
1189                 die("child finished with error '%d'\n", stat);
1190         exit(EXIT_SUCCESS);
1191 }
1192
1193 void
1194 ttynew(void) {
1195         int m, s;
1196         struct winsize w = {term.row, term.col, 0, 0};
1197
1198         /* seems to work fine on linux, openbsd and freebsd */
1199         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1200                 die("openpty failed: %s\n", strerror(errno));
1201
1202         switch(pid = fork()) {
1203         case -1:
1204                 die("fork failed\n");
1205                 break;
1206         case 0:
1207                 setsid(); /* create a new process group */
1208                 dup2(s, STDIN_FILENO);
1209                 dup2(s, STDOUT_FILENO);
1210                 dup2(s, STDERR_FILENO);
1211                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1212                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1213                 close(s);
1214                 close(m);
1215                 execsh();
1216                 break;
1217         default:
1218                 close(s);
1219                 cmdfd = m;
1220                 signal(SIGCHLD, sigchld);
1221                 if(opt_io) {
1222                         term.mode |= MODE_PRINT;
1223                         iofd = (!strcmp(opt_io, "-")) ?
1224                                   STDOUT_FILENO :
1225                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1226                         if(iofd < 0) {
1227                                 fprintf(stderr, "Error opening %s:%s\n",
1228                                         opt_io, strerror(errno));
1229                         }
1230                 }
1231                 break;
1232         }
1233 }
1234
1235 void
1236 ttyread(void) {
1237         static char buf[BUFSIZ];
1238         static int buflen = 0;
1239         char *ptr;
1240         char s[UTF_SIZ];
1241         int charsize; /* size of utf8 char in bytes */
1242         long unicodep;
1243         int ret;
1244
1245         /* append read bytes to unprocessed bytes */
1246         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1247                 die("Couldn't read from shell: %s\n", strerror(errno));
1248
1249         /* process every complete utf8 char */
1250         buflen += ret;
1251         ptr = buf;
1252         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1253                 utf8encode(unicodep, s, UTF_SIZ);
1254                 tputc(s, charsize);
1255                 ptr += charsize;
1256                 buflen -= charsize;
1257         }
1258
1259         /* keep any uncomplete utf8 char for the next call */
1260         memmove(buf, ptr, buflen);
1261 }
1262
1263 void
1264 ttywrite(const char *s, size_t n) {
1265         if(xwrite(cmdfd, s, n) == -1)
1266                 die("write error on tty: %s\n", strerror(errno));
1267 }
1268
1269 void
1270 ttysend(char *s, size_t n) {
1271         ttywrite(s, n);
1272         if(IS_SET(MODE_ECHO))
1273                 techo(s, n);
1274 }
1275
1276 void
1277 ttyresize(void) {
1278         struct winsize w;
1279
1280         w.ws_row = term.row;
1281         w.ws_col = term.col;
1282         w.ws_xpixel = xw.tw;
1283         w.ws_ypixel = xw.th;
1284         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1285                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1286 }
1287
1288 int
1289 tattrset(int attr) {
1290         int i, j;
1291
1292         for(i = 0; i < term.row-1; i++) {
1293                 for(j = 0; j < term.col-1; j++) {
1294                         if(term.line[i][j].mode & attr)
1295                                 return 1;
1296                 }
1297         }
1298
1299         return 0;
1300 }
1301
1302 void
1303 tsetdirt(int top, int bot) {
1304         int i;
1305
1306         LIMIT(top, 0, term.row-1);
1307         LIMIT(bot, 0, term.row-1);
1308
1309         for(i = top; i <= bot; i++)
1310                 term.dirty[i] = 1;
1311 }
1312
1313 void
1314 tsetdirtattr(int attr) {
1315         int i, j;
1316
1317         for(i = 0; i < term.row-1; i++) {
1318                 for(j = 0; j < term.col-1; j++) {
1319                         if(term.line[i][j].mode & attr) {
1320                                 tsetdirt(i, i);
1321                                 break;
1322                         }
1323                 }
1324         }
1325 }
1326
1327 void
1328 tfulldirt(void) {
1329         tsetdirt(0, term.row-1);
1330 }
1331
1332 void
1333 tcursor(int mode) {
1334         static TCursor c[2];
1335         bool alt = IS_SET(MODE_ALTSCREEN);
1336
1337         if(mode == CURSOR_SAVE) {
1338                 c[alt] = term.c;
1339         } else if(mode == CURSOR_LOAD) {
1340                 term.c = c[alt];
1341                 tmoveto(c[alt].x, c[alt].y);
1342         }
1343 }
1344
1345 void
1346 treset(void) {
1347         uint i;
1348
1349         term.c = (TCursor){{
1350                 .mode = ATTR_NULL,
1351                 .fg = defaultfg,
1352                 .bg = defaultbg
1353         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1354
1355         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1356         for(i = tabspaces; i < term.col; i += tabspaces)
1357                 term.tabs[i] = 1;
1358         term.top = 0;
1359         term.bot = term.row - 1;
1360         term.mode = MODE_WRAP;
1361         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1362         term.charset = 0;
1363
1364         for(i = 0; i < 2; i++) {
1365                 tmoveto(0, 0);
1366                 tcursor(CURSOR_SAVE);
1367                 tclearregion(0, 0, term.col-1, term.row-1);
1368                 tswapscreen();
1369         }
1370 }
1371
1372 void
1373 tnew(int col, int row) {
1374         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1375         tresize(col, row);
1376         term.numlock = 1;
1377
1378         treset();
1379 }
1380
1381 void
1382 tswapscreen(void) {
1383         Line *tmp = term.line;
1384
1385         term.line = term.alt;
1386         term.alt = tmp;
1387         term.mode ^= MODE_ALTSCREEN;
1388         tfulldirt();
1389 }
1390
1391 void
1392 tscrolldown(int orig, int n) {
1393         int i;
1394         Line temp;
1395
1396         LIMIT(n, 0, term.bot-orig+1);
1397
1398         tsetdirt(orig, term.bot-n);
1399         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1400
1401         for(i = term.bot; i >= orig+n; i--) {
1402                 temp = term.line[i];
1403                 term.line[i] = term.line[i-n];
1404                 term.line[i-n] = temp;
1405         }
1406
1407         selscroll(orig, n);
1408 }
1409
1410 void
1411 tscrollup(int orig, int n) {
1412         int i;
1413         Line temp;
1414
1415         LIMIT(n, 0, term.bot-orig+1);
1416
1417         tclearregion(0, orig, term.col-1, orig+n-1);
1418         tsetdirt(orig+n, term.bot);
1419
1420         for(i = orig; i <= term.bot-n; i++) {
1421                 temp = term.line[i];
1422                 term.line[i] = term.line[i+n];
1423                 term.line[i+n] = temp;
1424         }
1425
1426         selscroll(orig, -n);
1427 }
1428
1429 void
1430 selscroll(int orig, int n) {
1431         if(sel.ob.x == -1)
1432                 return;
1433
1434         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1435                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1436                         selclear(NULL);
1437                         return;
1438                 }
1439                 if(sel.type == SEL_RECTANGULAR) {
1440                         if(sel.ob.y < term.top)
1441                                 sel.ob.y = term.top;
1442                         if(sel.oe.y > term.bot)
1443                                 sel.oe.y = term.bot;
1444                 } else {
1445                         if(sel.ob.y < term.top) {
1446                                 sel.ob.y = term.top;
1447                                 sel.ob.x = 0;
1448                         }
1449                         if(sel.oe.y > term.bot) {
1450                                 sel.oe.y = term.bot;
1451                                 sel.oe.x = term.col;
1452                         }
1453                 }
1454                 selnormalize();
1455         }
1456 }
1457
1458 void
1459 tnewline(int first_col) {
1460         int y = term.c.y;
1461
1462         if(y == term.bot) {
1463                 tscrollup(term.top, 1);
1464         } else {
1465                 y++;
1466         }
1467         tmoveto(first_col ? 0 : term.c.x, y);
1468 }
1469
1470 void
1471 csiparse(void) {
1472         char *p = csiescseq.buf, *np;
1473         long int v;
1474
1475         csiescseq.narg = 0;
1476         if(*p == '?') {
1477                 csiescseq.priv = 1;
1478                 p++;
1479         }
1480
1481         csiescseq.buf[csiescseq.len] = '\0';
1482         while(p < csiescseq.buf+csiescseq.len) {
1483                 np = NULL;
1484                 v = strtol(p, &np, 10);
1485                 if(np == p)
1486                         v = 0;
1487                 if(v == LONG_MAX || v == LONG_MIN)
1488                         v = -1;
1489                 csiescseq.arg[csiescseq.narg++] = v;
1490                 p = np;
1491                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1492                         break;
1493                 p++;
1494         }
1495         csiescseq.mode = *p;
1496 }
1497
1498 /* for absolute user moves, when decom is set */
1499 void
1500 tmoveato(int x, int y) {
1501         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1502 }
1503
1504 void
1505 tmoveto(int x, int y) {
1506         int miny, maxy;
1507
1508         if(term.c.state & CURSOR_ORIGIN) {
1509                 miny = term.top;
1510                 maxy = term.bot;
1511         } else {
1512                 miny = 0;
1513                 maxy = term.row - 1;
1514         }
1515         LIMIT(x, 0, term.col-1);
1516         LIMIT(y, miny, maxy);
1517         term.c.state &= ~CURSOR_WRAPNEXT;
1518         term.c.x = x;
1519         term.c.y = y;
1520 }
1521
1522 void
1523 tsetchar(char *c, Glyph *attr, int x, int y) {
1524         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1525                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1526                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1527                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1528                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1529                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1530                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1531                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1532                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1533         };
1534
1535         /*
1536          * The table is proudly stolen from rxvt.
1537          */
1538         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1539                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1540                         c = vt100_0[c[0] - 0x41];
1541                 }
1542         }
1543
1544         if(term.line[y][x].mode & ATTR_WIDE) {
1545                 if(x+1 < term.col) {
1546                         term.line[y][x+1].c[0] = ' ';
1547                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1548                 }
1549         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1550                 term.line[y][x-1].c[0] = ' ';
1551                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1552         }
1553
1554         term.dirty[y] = 1;
1555         term.line[y][x] = *attr;
1556         memcpy(term.line[y][x].c, c, UTF_SIZ);
1557 }
1558
1559 void
1560 tclearregion(int x1, int y1, int x2, int y2) {
1561         int x, y, temp;
1562         Glyph *gp;
1563
1564         if(x1 > x2)
1565                 temp = x1, x1 = x2, x2 = temp;
1566         if(y1 > y2)
1567                 temp = y1, y1 = y2, y2 = temp;
1568
1569         LIMIT(x1, 0, term.col-1);
1570         LIMIT(x2, 0, term.col-1);
1571         LIMIT(y1, 0, term.row-1);
1572         LIMIT(y2, 0, term.row-1);
1573
1574         for(y = y1; y <= y2; y++) {
1575                 term.dirty[y] = 1;
1576                 for(x = x1; x <= x2; x++) {
1577                         gp = &term.line[y][x];
1578                         if(selected(x, y))
1579                                 selclear(NULL);
1580                         gp->fg = term.c.attr.fg;
1581                         gp->bg = term.c.attr.bg;
1582                         gp->mode = 0;
1583                         memcpy(gp->c, " ", 2);
1584                 }
1585         }
1586 }
1587
1588 void
1589 tdeletechar(int n) {
1590         int dst, src, size;
1591         Glyph *line;
1592
1593         LIMIT(n, 0, term.col - term.c.x);
1594
1595         dst = term.c.x;
1596         src = term.c.x + n;
1597         size = term.col - src;
1598         line = term.line[term.c.y];
1599
1600         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1601         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1602 }
1603
1604 void
1605 tinsertblank(int n) {
1606         int dst, src, size;
1607         Glyph *line;
1608
1609         LIMIT(n, 0, term.col - term.c.x);
1610
1611         dst = term.c.x + n;
1612         src = term.c.x;
1613         size = term.col - dst;
1614         line = term.line[term.c.y];
1615
1616         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1617         tclearregion(src, term.c.y, dst - 1, term.c.y);
1618 }
1619
1620 void
1621 tinsertblankline(int n) {
1622         if(BETWEEN(term.c.y, term.top, term.bot))
1623                 tscrolldown(term.c.y, n);
1624 }
1625
1626 void
1627 tdeleteline(int n) {
1628         if(BETWEEN(term.c.y, term.top, term.bot))
1629                 tscrollup(term.c.y, n);
1630 }
1631
1632 int32_t
1633 tdefcolor(int *attr, int *npar, int l) {
1634         int32_t idx = -1;
1635         uint r, g, b;
1636
1637         switch (attr[*npar + 1]) {
1638         case 2: /* direct color in RGB space */
1639                 if (*npar + 4 >= l) {
1640                         fprintf(stderr,
1641                                 "erresc(38): Incorrect number of parameters (%d)\n",
1642                                 *npar);
1643                         break;
1644                 }
1645                 r = attr[*npar + 2];
1646                 g = attr[*npar + 3];
1647                 b = attr[*npar + 4];
1648                 *npar += 4;
1649                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1650                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1651                                 r, g, b);
1652                 else
1653                         idx = TRUECOLOR(r, g, b);
1654                 break;
1655         case 5: /* indexed color */
1656                 if (*npar + 2 >= l) {
1657                         fprintf(stderr,
1658                                 "erresc(38): Incorrect number of parameters (%d)\n",
1659                                 *npar);
1660                         break;
1661                 }
1662                 *npar += 2;
1663                 if(!BETWEEN(attr[*npar], 0, 255))
1664                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1665                 else
1666                         idx = attr[*npar];
1667                 break;
1668         case 0: /* implemented defined (only foreground) */
1669         case 1: /* transparent */
1670         case 3: /* direct color in CMY space */
1671         case 4: /* direct color in CMYK space */
1672         default:
1673                 fprintf(stderr,
1674                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1675                 break;
1676         }
1677
1678         return idx;
1679 }
1680
1681 void
1682 tsetattr(int *attr, int l) {
1683         int i;
1684         int32_t idx;
1685
1686         for(i = 0; i < l; i++) {
1687                 switch(attr[i]) {
1688                 case 0:
1689                         term.c.attr.mode &= ~(
1690                                 ATTR_BOLD       |
1691                                 ATTR_FAINT      |
1692                                 ATTR_ITALIC     |
1693                                 ATTR_UNDERLINE  |
1694                                 ATTR_BLINK      |
1695                                 ATTR_REVERSE    |
1696                                 ATTR_INVISIBLE  |
1697                                 ATTR_STRUCK     );
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 2:
1705                         term.c.attr.mode |= ATTR_FAINT;
1706                         break;
1707                 case 3:
1708                         term.c.attr.mode |= ATTR_ITALIC;
1709                         break;
1710                 case 4:
1711                         term.c.attr.mode |= ATTR_UNDERLINE;
1712                         break;
1713                 case 5: /* slow blink */
1714                         /* FALLTHROUGH */
1715                 case 6: /* rapid blink */
1716                         term.c.attr.mode |= ATTR_BLINK;
1717                         break;
1718                 case 7:
1719                         term.c.attr.mode |= ATTR_REVERSE;
1720                         break;
1721                 case 8:
1722                         term.c.attr.mode |= ATTR_INVISIBLE;
1723                         break;
1724                 case 9:
1725                         term.c.attr.mode |= ATTR_STRUCK;
1726                         break;
1727                 case 22:
1728                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1729                         break;
1730                 case 23:
1731                         term.c.attr.mode &= ~ATTR_ITALIC;
1732                         break;
1733                 case 24:
1734                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1735                         break;
1736                 case 25:
1737                         term.c.attr.mode &= ~ATTR_BLINK;
1738                         break;
1739                 case 27:
1740                         term.c.attr.mode &= ~ATTR_REVERSE;
1741                         break;
1742                 case 28:
1743                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1744                         break;
1745                 case 29:
1746                         term.c.attr.mode &= ~ATTR_STRUCK;
1747                         break;
1748                 case 38:
1749                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1750                                 term.c.attr.fg = idx;
1751                         break;
1752                 case 39:
1753                         term.c.attr.fg = defaultfg;
1754                         break;
1755                 case 48:
1756                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1757                                 term.c.attr.bg = idx;
1758                         break;
1759                 case 49:
1760                         term.c.attr.bg = defaultbg;
1761                         break;
1762                 default:
1763                         if(BETWEEN(attr[i], 30, 37)) {
1764                                 term.c.attr.fg = attr[i] - 30;
1765                         } else if(BETWEEN(attr[i], 40, 47)) {
1766                                 term.c.attr.bg = attr[i] - 40;
1767                         } else if(BETWEEN(attr[i], 90, 97)) {
1768                                 term.c.attr.fg = attr[i] - 90 + 8;
1769                         } else if(BETWEEN(attr[i], 100, 107)) {
1770                                 term.c.attr.bg = attr[i] - 100 + 8;
1771                         } else {
1772                                 fprintf(stderr,
1773                                         "erresc(default): gfx attr %d unknown\n",
1774                                         attr[i]), csidump();
1775                         }
1776                         break;
1777                 }
1778         }
1779 }
1780
1781 void
1782 tsetscroll(int t, int b) {
1783         int temp;
1784
1785         LIMIT(t, 0, term.row-1);
1786         LIMIT(b, 0, term.row-1);
1787         if(t > b) {
1788                 temp = t;
1789                 t = b;
1790                 b = temp;
1791         }
1792         term.top = t;
1793         term.bot = b;
1794 }
1795
1796 void
1797 tsetmode(bool priv, bool set, int *args, int narg) {
1798         int *lim, mode;
1799         bool alt;
1800
1801         for(lim = args + narg; args < lim; ++args) {
1802                 if(priv) {
1803                         switch(*args) {
1804                         case 1: /* DECCKM -- Cursor key */
1805                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1806                                 break;
1807                         case 5: /* DECSCNM -- Reverse video */
1808                                 mode = term.mode;
1809                                 MODBIT(term.mode, set, MODE_REVERSE);
1810                                 if(mode != term.mode)
1811                                         redraw(REDRAW_TIMEOUT);
1812                                 break;
1813                         case 6: /* DECOM -- Origin */
1814                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1815                                 tmoveato(0, 0);
1816                                 break;
1817                         case 7: /* DECAWM -- Auto wrap */
1818                                 MODBIT(term.mode, set, MODE_WRAP);
1819                                 break;
1820                         case 0:  /* Error (IGNORED) */
1821                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1822                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1823                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1824                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1825                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1826                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1827                         case 42: /* DECNRCM -- National characters (IGNORED) */
1828                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1829                                 break;
1830                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1831                                 MODBIT(term.mode, !set, MODE_HIDE);
1832                                 break;
1833                         case 9:    /* X10 mouse compatibility mode */
1834                                 xsetpointermotion(0);
1835                                 MODBIT(term.mode, 0, MODE_MOUSE);
1836                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1837                                 break;
1838                         case 1000: /* 1000: report button press */
1839                                 xsetpointermotion(0);
1840                                 MODBIT(term.mode, 0, MODE_MOUSE);
1841                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1842                                 break;
1843                         case 1002: /* 1002: report motion on button press */
1844                                 xsetpointermotion(0);
1845                                 MODBIT(term.mode, 0, MODE_MOUSE);
1846                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1847                                 break;
1848                         case 1003: /* 1003: enable all mouse motions */
1849                                 xsetpointermotion(set);
1850                                 MODBIT(term.mode, 0, MODE_MOUSE);
1851                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1852                                 break;
1853                         case 1004: /* 1004: send focus events to tty */
1854                                 MODBIT(term.mode, set, MODE_FOCUS);
1855                                 break;
1856                         case 1006: /* 1006: extended reporting mode */
1857                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1858                                 break;
1859                         case 1034:
1860                                 MODBIT(term.mode, set, MODE_8BIT);
1861                                 break;
1862                         case 1049: /* swap screen & set/restore cursor as xterm */
1863                                 if (!allowaltscreen)
1864                                         break;
1865                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1866                                 /* FALLTHROUGH */
1867                         case 47: /* swap screen */
1868                         case 1047:
1869                                 if (!allowaltscreen)
1870                                         break;
1871                                 alt = IS_SET(MODE_ALTSCREEN);
1872                                 if(alt) {
1873                                         tclearregion(0, 0, term.col-1,
1874                                                         term.row-1);
1875                                 }
1876                                 if(set ^ alt) /* set is always 1 or 0 */
1877                                         tswapscreen();
1878                                 if(*args != 1049)
1879                                         break;
1880                                 /* FALLTHROUGH */
1881                         case 1048:
1882                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1883                                 break;
1884                         case 2004: /* 2004: bracketed paste mode */
1885                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1886                                 break;
1887                         /* Not implemented mouse modes. See comments there. */
1888                         case 1001: /* mouse highlight mode; can hang the
1889                                       terminal by design when implemented. */
1890                         case 1005: /* UTF-8 mouse mode; will confuse
1891                                       applications not supporting UTF-8
1892                                       and luit. */
1893                         case 1015: /* urxvt mangled mouse mode; incompatible
1894                                       and can be mistaken for other control
1895                                       codes. */
1896                         default:
1897                                 fprintf(stderr,
1898                                         "erresc: unknown private set/reset mode %d\n",
1899                                         *args);
1900                                 break;
1901                         }
1902                 } else {
1903                         switch(*args) {
1904                         case 0:  /* Error (IGNORED) */
1905                                 break;
1906                         case 2:  /* KAM -- keyboard action */
1907                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1908                                 break;
1909                         case 4:  /* IRM -- Insertion-replacement */
1910                                 MODBIT(term.mode, set, MODE_INSERT);
1911                                 break;
1912                         case 12: /* SRM -- Send/Receive */
1913                                 MODBIT(term.mode, !set, MODE_ECHO);
1914                                 break;
1915                         case 20: /* LNM -- Linefeed/new line */
1916                                 MODBIT(term.mode, set, MODE_CRLF);
1917                                 break;
1918                         default:
1919                                 fprintf(stderr,
1920                                         "erresc: unknown set/reset mode %d\n",
1921                                         *args);
1922                                 break;
1923                         }
1924                 }
1925         }
1926 }
1927
1928 void
1929 csihandle(void) {
1930         char buf[40];
1931         int len;
1932
1933         switch(csiescseq.mode) {
1934         default:
1935         unknown:
1936                 fprintf(stderr, "erresc: unknown csi ");
1937                 csidump();
1938                 /* die(""); */
1939                 break;
1940         case '@': /* ICH -- Insert <n> blank char */
1941                 DEFAULT(csiescseq.arg[0], 1);
1942                 tinsertblank(csiescseq.arg[0]);
1943                 break;
1944         case 'A': /* CUU -- Cursor <n> Up */
1945                 DEFAULT(csiescseq.arg[0], 1);
1946                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1947                 break;
1948         case 'B': /* CUD -- Cursor <n> Down */
1949         case 'e': /* VPR --Cursor <n> Down */
1950                 DEFAULT(csiescseq.arg[0], 1);
1951                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1952                 break;
1953         case 'i': /* MC -- Media Copy */
1954                 switch(csiescseq.arg[0]) {
1955                 case 0:
1956                         tdump();
1957                         break;
1958                 case 1:
1959                         tdumpline(term.c.y);
1960                         break;
1961                 case 2:
1962                         tdumpsel();
1963                         break;
1964                 case 4:
1965                         term.mode &= ~MODE_PRINT;
1966                         break;
1967                 case 5:
1968                         term.mode |= MODE_PRINT;
1969                         break;
1970                 }
1971                 break;
1972         case 'c': /* DA -- Device Attributes */
1973                 if(csiescseq.arg[0] == 0)
1974                         ttywrite(vtiden, sizeof(vtiden) - 1);
1975                 break;
1976         case 'C': /* CUF -- Cursor <n> Forward */
1977         case 'a': /* HPR -- Cursor <n> Forward */
1978                 DEFAULT(csiescseq.arg[0], 1);
1979                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1980                 break;
1981         case 'D': /* CUB -- Cursor <n> Backward */
1982                 DEFAULT(csiescseq.arg[0], 1);
1983                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1984                 break;
1985         case 'E': /* CNL -- Cursor <n> Down and first col */
1986                 DEFAULT(csiescseq.arg[0], 1);
1987                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1988                 break;
1989         case 'F': /* CPL -- Cursor <n> Up and first col */
1990                 DEFAULT(csiescseq.arg[0], 1);
1991                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1992                 break;
1993         case 'g': /* TBC -- Tabulation clear */
1994                 switch(csiescseq.arg[0]) {
1995                 case 0: /* clear current tab stop */
1996                         term.tabs[term.c.x] = 0;
1997                         break;
1998                 case 3: /* clear all the tabs */
1999                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2000                         break;
2001                 default:
2002                         goto unknown;
2003                 }
2004                 break;
2005         case 'G': /* CHA -- Move to <col> */
2006         case '`': /* HPA */
2007                 DEFAULT(csiescseq.arg[0], 1);
2008                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2009                 break;
2010         case 'H': /* CUP -- Move to <row> <col> */
2011         case 'f': /* HVP */
2012                 DEFAULT(csiescseq.arg[0], 1);
2013                 DEFAULT(csiescseq.arg[1], 1);
2014                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2015                 break;
2016         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2017                 DEFAULT(csiescseq.arg[0], 1);
2018                 tputtab(csiescseq.arg[0]);
2019                 break;
2020         case 'J': /* ED -- Clear screen */
2021                 selclear(NULL);
2022                 switch(csiescseq.arg[0]) {
2023                 case 0: /* below */
2024                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2025                         if(term.c.y < term.row-1) {
2026                                 tclearregion(0, term.c.y+1, term.col-1,
2027                                                 term.row-1);
2028                         }
2029                         break;
2030                 case 1: /* above */
2031                         if(term.c.y > 1)
2032                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2033                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2034                         break;
2035                 case 2: /* all */
2036                         tclearregion(0, 0, term.col-1, term.row-1);
2037                         break;
2038                 default:
2039                         goto unknown;
2040                 }
2041                 break;
2042         case 'K': /* EL -- Clear line */
2043                 switch(csiescseq.arg[0]) {
2044                 case 0: /* right */
2045                         tclearregion(term.c.x, term.c.y, term.col-1,
2046                                         term.c.y);
2047                         break;
2048                 case 1: /* left */
2049                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2050                         break;
2051                 case 2: /* all */
2052                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2053                         break;
2054                 }
2055                 break;
2056         case 'S': /* SU -- Scroll <n> line up */
2057                 DEFAULT(csiescseq.arg[0], 1);
2058                 tscrollup(term.top, csiescseq.arg[0]);
2059                 break;
2060         case 'T': /* SD -- Scroll <n> line down */
2061                 DEFAULT(csiescseq.arg[0], 1);
2062                 tscrolldown(term.top, csiescseq.arg[0]);
2063                 break;
2064         case 'L': /* IL -- Insert <n> blank lines */
2065                 DEFAULT(csiescseq.arg[0], 1);
2066                 tinsertblankline(csiescseq.arg[0]);
2067                 break;
2068         case 'l': /* RM -- Reset Mode */
2069                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2070                 break;
2071         case 'M': /* DL -- Delete <n> lines */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 tdeleteline(csiescseq.arg[0]);
2074                 break;
2075         case 'X': /* ECH -- Erase <n> char */
2076                 DEFAULT(csiescseq.arg[0], 1);
2077                 tclearregion(term.c.x, term.c.y,
2078                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2079                 break;
2080         case 'P': /* DCH -- Delete <n> char */
2081                 DEFAULT(csiescseq.arg[0], 1);
2082                 tdeletechar(csiescseq.arg[0]);
2083                 break;
2084         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2085                 DEFAULT(csiescseq.arg[0], 1);
2086                 tputtab(-csiescseq.arg[0]);
2087                 break;
2088         case 'd': /* VPA -- Move to <row> */
2089                 DEFAULT(csiescseq.arg[0], 1);
2090                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2091                 break;
2092         case 'h': /* SM -- Set terminal mode */
2093                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2094                 break;
2095         case 'm': /* SGR -- Terminal attribute (color) */
2096                 tsetattr(csiescseq.arg, csiescseq.narg);
2097                 break;
2098         case 'n': /* DSR – Device Status Report (cursor position) */
2099                 if (csiescseq.arg[0] == 6) {
2100                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2101                                         term.c.y+1, term.c.x+1);
2102                         ttywrite(buf, len);
2103                 }
2104                 break;
2105         case 'r': /* DECSTBM -- Set Scrolling Region */
2106                 if(csiescseq.priv) {
2107                         goto unknown;
2108                 } else {
2109                         DEFAULT(csiescseq.arg[0], 1);
2110                         DEFAULT(csiescseq.arg[1], term.row);
2111                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2112                         tmoveato(0, 0);
2113                 }
2114                 break;
2115         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2116                 tcursor(CURSOR_SAVE);
2117                 break;
2118         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2119                 tcursor(CURSOR_LOAD);
2120                 break;
2121         }
2122 }
2123
2124 void
2125 csidump(void) {
2126         int i;
2127         uint c;
2128
2129         printf("ESC[");
2130         for(i = 0; i < csiescseq.len; i++) {
2131                 c = csiescseq.buf[i] & 0xff;
2132                 if(isprint(c)) {
2133                         putchar(c);
2134                 } else if(c == '\n') {
2135                         printf("(\\n)");
2136                 } else if(c == '\r') {
2137                         printf("(\\r)");
2138                 } else if(c == 0x1b) {
2139                         printf("(\\e)");
2140                 } else {
2141                         printf("(%02x)", c);
2142                 }
2143         }
2144         putchar('\n');
2145 }
2146
2147 void
2148 csireset(void) {
2149         memset(&csiescseq, 0, sizeof(csiescseq));
2150 }
2151
2152 void
2153 strhandle(void) {
2154         char *p = NULL;
2155         int j, narg, par;
2156
2157         term.esc &= ~(ESC_STR_END|ESC_STR);
2158         strparse();
2159         narg = strescseq.narg;
2160         par = atoi(strescseq.args[0]);
2161
2162         switch(strescseq.type) {
2163         case ']': /* OSC -- Operating System Command */
2164                 switch(par) {
2165                 case 0:
2166                 case 1:
2167                 case 2:
2168                         if(narg > 1)
2169                                 xsettitle(strescseq.args[1]);
2170                         return;
2171                 case 4: /* color set */
2172                         if(narg < 3)
2173                                 break;
2174                         p = strescseq.args[2];
2175                         /* FALLTHROUGH */
2176                 case 104: /* color reset, here p = NULL */
2177                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2178                         if(xsetcolorname(j, p)) {
2179                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2180                         } else {
2181                                 /*
2182                                  * TODO if defaultbg color is changed, borders
2183                                  * are dirty
2184                                  */
2185                                 redraw(0);
2186                         }
2187                         return;
2188                 }
2189                 break;
2190         case 'k': /* old title set compatibility */
2191                 xsettitle(strescseq.args[0]);
2192                 return;
2193         case 'P': /* DCS -- Device Control String */
2194         case '_': /* APC -- Application Program Command */
2195         case '^': /* PM -- Privacy Message */
2196                 return;
2197         }
2198
2199         fprintf(stderr, "erresc: unknown str ");
2200         strdump();
2201 }
2202
2203 void
2204 strparse(void) {
2205         char *p = strescseq.buf;
2206
2207         strescseq.narg = 0;
2208         strescseq.buf[strescseq.len] = '\0';
2209         while(p && strescseq.narg < STR_ARG_SIZ)
2210                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2211 }
2212
2213 void
2214 strdump(void) {
2215         int i;
2216         uint c;
2217
2218         printf("ESC%c", strescseq.type);
2219         for(i = 0; i < strescseq.len; i++) {
2220                 c = strescseq.buf[i] & 0xff;
2221                 if(c == '\0') {
2222                         return;
2223                 } else if(isprint(c)) {
2224                         putchar(c);
2225                 } else if(c == '\n') {
2226                         printf("(\\n)");
2227                 } else if(c == '\r') {
2228                         printf("(\\r)");
2229                 } else if(c == 0x1b) {
2230                         printf("(\\e)");
2231                 } else {
2232                         printf("(%02x)", c);
2233                 }
2234         }
2235         printf("ESC\\\n");
2236 }
2237
2238 void
2239 strreset(void) {
2240         memset(&strescseq, 0, sizeof(strescseq));
2241 }
2242
2243 void
2244 tprinter(char *s, size_t len) {
2245         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2246                 fprintf(stderr, "Error writing in %s:%s\n",
2247                         opt_io, strerror(errno));
2248                 close(iofd);
2249                 iofd = -1;
2250         }
2251 }
2252
2253 void
2254 toggleprinter(const Arg *arg) {
2255         term.mode ^= MODE_PRINT;
2256 }
2257
2258 void
2259 printscreen(const Arg *arg) {
2260         tdump();
2261 }
2262
2263 void
2264 printsel(const Arg *arg) {
2265         tdumpsel();
2266 }
2267
2268 void
2269 tdumpsel(void) {
2270         char *ptr;
2271
2272         if((ptr = getsel())) {
2273                 tprinter(ptr, strlen(ptr));
2274                 free(ptr);
2275         }
2276 }
2277
2278 void
2279 tdumpline(int n) {
2280         Glyph *bp, *end;
2281
2282         bp = &term.line[n][0];
2283         end = &bp[MIN(tlinelen(n), term.col) - 1];
2284         if(bp != end || bp->c[0] != ' ') {
2285                 for( ;bp <= end; ++bp)
2286                         tprinter(bp->c, utf8len(bp->c));
2287         }
2288         tprinter("\n", 1);
2289 }
2290
2291 void
2292 tdump(void) {
2293         int i;
2294
2295         for(i = 0; i < term.row; ++i)
2296                 tdumpline(i);
2297 }
2298
2299 void
2300 tputtab(int n) {
2301         uint x = term.c.x;
2302
2303         if(n > 0) {
2304                 while(x < term.col && n--)
2305                         for(++x; x < term.col && !term.tabs[x]; ++x)
2306                                 /* nothing */ ;
2307         } else if(n < 0) {
2308                 while(x > 0 && n++)
2309                         for(--x; x > 0 && !term.tabs[x]; --x)
2310                                 /* nothing */ ;
2311         }
2312         tmoveto(x, term.c.y);
2313 }
2314
2315 void
2316 techo(char *buf, int len) {
2317         for(; len > 0; buf++, len--) {
2318                 char c = *buf;
2319
2320                 if(ISCONTROL((uchar) c)) { /* control code */
2321                         if(c & 0x80) {
2322                                 c &= 0x7f;
2323                                 tputc("^", 1);
2324                                 tputc("[", 1);
2325                         } else if(c != '\n' && c != '\r' && c != '\t') {
2326                                 c ^= 0x40;
2327                                 tputc("^", 1);
2328                         }
2329                         tputc(&c, 1);
2330                 } else {
2331                         break;
2332                 }
2333         }
2334         if(len)
2335                 tputc(buf, len);
2336 }
2337
2338 void
2339 tdeftran(char ascii) {
2340         static char cs[] = "0B";
2341         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2342         char *p;
2343
2344         if((p = strchr(cs, ascii)) == NULL) {
2345                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2346         } else {
2347                 term.trantbl[term.icharset] = vcs[p - cs];
2348         }
2349 }
2350
2351 void
2352 tdectest(char c) {
2353         static char E[UTF_SIZ] = "E";
2354         int x, y;
2355
2356         if(c == '8') { /* DEC screen alignment test. */
2357                 for(x = 0; x < term.col; ++x) {
2358                         for(y = 0; y < term.row; ++y)
2359                                 tsetchar(E, &term.c.attr, x, y);
2360                 }
2361         }
2362 }
2363
2364 void
2365 tstrsequence(uchar c) {
2366         if (c & 0x80) {
2367                 switch (c) {
2368                 case 0x90:   /* DCS -- Device Control String */
2369                         c = 'P';
2370                         break;
2371                 case 0x9f:   /* APC -- Application Program Command */
2372                         c = '_';
2373                         break;
2374                 case 0x9e:   /* PM -- Privacy Message */
2375                         c = '^';
2376                         break;
2377                 case 0x9d:   /* OSC -- Operating System Command */
2378                         c = ']';
2379                         break;
2380                 }
2381         }
2382         strreset();
2383         strescseq.type = c;
2384         term.esc |= ESC_STR;
2385         return;
2386 }
2387
2388 void
2389 tcontrolcode(uchar ascii) {
2390         static char question[UTF_SIZ] = "?";
2391
2392         switch(ascii) {
2393         case '\t':   /* HT */
2394                 tputtab(1);
2395                 return;
2396         case '\b':   /* BS */
2397                 tmoveto(term.c.x-1, term.c.y);
2398                 return;
2399         case '\r':   /* CR */
2400                 tmoveto(0, term.c.y);
2401                 return;
2402         case '\f':   /* LF */
2403         case '\v':   /* VT */
2404         case '\n':   /* LF */
2405                 /* go to first col if the mode is set */
2406                 tnewline(IS_SET(MODE_CRLF));
2407                 return;
2408         case '\a':   /* BEL */
2409                 if(term.esc & ESC_STR_END) {
2410                         /* backwards compatibility to xterm */
2411                         strhandle();
2412                 } else {
2413                         if(!(xw.state & WIN_FOCUSED))
2414                                 xseturgency(1);
2415                         if (bellvolume)
2416                                 XBell(xw.dpy, bellvolume);
2417                 }
2418                 break;
2419         case '\033': /* ESC */
2420                 csireset();
2421                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2422                 term.esc |= ESC_START;
2423                 return;
2424         case '\016': /* SO */
2425                 term.charset = 0;
2426                 return;
2427         case '\017': /* SI */
2428                 term.charset = 1;
2429                 return;
2430         case '\032': /* SUB */
2431                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2432         case '\030': /* CAN */
2433                 csireset();
2434                 break;
2435         case '\005': /* ENQ (IGNORED) */
2436         case '\000': /* NUL (IGNORED) */
2437         case '\021': /* XON (IGNORED) */
2438         case '\023': /* XOFF (IGNORED) */
2439         case 0177:   /* DEL (IGNORED) */
2440                 return;
2441         case 0x84:   /* TODO: IND */
2442                 break;
2443         case 0x85:   /* NEL -- Next line */
2444                 tnewline(1); /* always go to first col */
2445                 break;
2446         case 0x88:   /* HTS -- Horizontal tab stop */
2447                 term.tabs[term.c.x] = 1;
2448                 break;
2449         case 0x8d:   /* TODO: RI */
2450         case 0x8e:   /* TODO: SS2 */
2451         case 0x8f:   /* TODO: SS3 */
2452         case 0x98:   /* TODO: SOS */
2453                 break;
2454         case 0x9a:   /* DECID -- Identify Terminal */
2455                 ttywrite(vtiden, sizeof(vtiden) - 1);
2456                 break;
2457         case 0x9b:   /* TODO: CSI */
2458         case 0x9c:   /* TODO: ST */
2459                 break;
2460         case 0x90:   /* DCS -- Device Control String */
2461         case 0x9f:   /* APC -- Application Program Command */
2462         case 0x9e:   /* PM -- Privacy Message */
2463         case 0x9d:   /* OSC -- Operating System Command */
2464                 tstrsequence(ascii);
2465                 return;
2466         }
2467         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2468         term.esc &= ~(ESC_STR_END|ESC_STR);
2469         return;
2470 }
2471
2472 /*
2473  * returns 1 when the sequence is finished and it hasn't to read
2474  * more characters for this sequence, otherwise 0
2475  */
2476 int
2477 eschandle(uchar ascii) {
2478         switch(ascii) {
2479         case '[':
2480                 term.esc |= ESC_CSI;
2481                 return 0;
2482         case '#':
2483                 term.esc |= ESC_TEST;
2484                 return 0;
2485         case 'P': /* DCS -- Device Control String */
2486         case '_': /* APC -- Application Program Command */
2487         case '^': /* PM -- Privacy Message */
2488         case ']': /* OSC -- Operating System Command */
2489         case 'k': /* old title set compatibility */
2490                 tstrsequence(ascii);
2491                 return 0;
2492         case '(': /* set primary charset G0 */
2493         case ')': /* set secondary charset G1 */
2494         case '*': /* set tertiary charset G2 */
2495         case '+': /* set quaternary charset G3 */
2496                 term.icharset = ascii - '(';
2497                 term.esc |= ESC_ALTCHARSET;
2498                 return 0;
2499         case 'D': /* IND -- Linefeed */
2500                 if(term.c.y == term.bot) {
2501                         tscrollup(term.top, 1);
2502                 } else {
2503                         tmoveto(term.c.x, term.c.y+1);
2504                 }
2505                 break;
2506         case 'E': /* NEL -- Next line */
2507                 tnewline(1); /* always go to first col */
2508                 break;
2509         case 'H': /* HTS -- Horizontal tab stop */
2510                 term.tabs[term.c.x] = 1;
2511                 break;
2512         case 'M': /* RI -- Reverse index */
2513                 if(term.c.y == term.top) {
2514                         tscrolldown(term.top, 1);
2515                 } else {
2516                         tmoveto(term.c.x, term.c.y-1);
2517                 }
2518                 break;
2519         case 'Z': /* DECID -- Identify Terminal */
2520                 ttywrite(vtiden, sizeof(vtiden) - 1);
2521                 break;
2522         case 'c': /* RIS -- Reset to inital state */
2523                 treset();
2524                 xresettitle();
2525                 xloadcols();
2526                 break;
2527         case '=': /* DECPAM -- Application keypad */
2528                 term.mode |= MODE_APPKEYPAD;
2529                 break;
2530         case '>': /* DECPNM -- Normal keypad */
2531                 term.mode &= ~MODE_APPKEYPAD;
2532                 break;
2533         case '7': /* DECSC -- Save Cursor */
2534                 tcursor(CURSOR_SAVE);
2535                 break;
2536         case '8': /* DECRC -- Restore Cursor */
2537                 tcursor(CURSOR_LOAD);
2538                 break;
2539         case '\\': /* ST -- String Terminator */
2540                 if(term.esc & ESC_STR_END)
2541                         strhandle();
2542                 break;
2543         default:
2544                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2545                         (uchar) ascii, isprint(ascii)? ascii:'.');
2546                 break;
2547         }
2548         return 1;
2549 }
2550
2551 void
2552 tputc(char *c, int len) {
2553         uchar ascii;
2554         bool control;
2555         long unicodep;
2556         int width;
2557         Glyph *gp;
2558
2559         if(len == 1) {
2560                 width = 1;
2561                 unicodep = ascii = *c;
2562         } else {
2563                 utf8decode(c, &unicodep, UTF_SIZ);
2564                 width = wcwidth(unicodep);
2565                 control = ISCONTROLC1(unicodep);
2566                 ascii = unicodep;
2567         }
2568
2569         if(IS_SET(MODE_PRINT))
2570                 tprinter(c, len);
2571         control = ISCONTROL(unicodep);
2572
2573         /*
2574          * STR sequence must be checked before anything else
2575          * because it uses all following characters until it
2576          * receives a ESC, a SUB, a ST or any other C1 control
2577          * character.
2578          */
2579         if(term.esc & ESC_STR) {
2580                 if(width == 1 &&
2581                    (ascii == '\a' || ascii == 030 ||
2582                     ascii == 032  || ascii == 033 ||
2583                     ISCONTROLC1(unicodep))) {
2584                         term.esc &= ~(ESC_START|ESC_STR);
2585                         term.esc |= ESC_STR_END;
2586                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2587                         memmove(&strescseq.buf[strescseq.len], c, len);
2588                         strescseq.len += len;
2589                         return;
2590                 } else {
2591                 /*
2592                  * Here is a bug in terminals. If the user never sends
2593                  * some code to stop the str or esc command, then st
2594                  * will stop responding. But this is better than
2595                  * silently failing with unknown characters. At least
2596                  * then users will report back.
2597                  *
2598                  * In the case users ever get fixed, here is the code:
2599                  */
2600                 /*
2601                  * term.esc = 0;
2602                  * strhandle();
2603                  */
2604                         return;
2605                 }
2606         }
2607
2608         /*
2609          * Actions of control codes must be performed as soon they arrive
2610          * because they can be embedded inside a control sequence, and
2611          * they must not cause conflicts with sequences.
2612          */
2613         if(control) {
2614                 tcontrolcode(ascii);
2615                 /*
2616                  * control codes are not shown ever
2617                  */
2618                 return;
2619         } else if(term.esc & ESC_START) {
2620                 if(term.esc & ESC_CSI) {
2621                         csiescseq.buf[csiescseq.len++] = ascii;
2622                         if(BETWEEN(ascii, 0x40, 0x7E)
2623                                         || csiescseq.len >= \
2624                                         sizeof(csiescseq.buf)-1) {
2625                                 term.esc = 0;
2626                                 csiparse();
2627                                 csihandle();
2628                         }
2629                         return;
2630                 } else if(term.esc & ESC_ALTCHARSET) {
2631                         tdeftran(ascii);
2632                 } else if(term.esc & ESC_TEST) {
2633                         tdectest(ascii);
2634                 } else {
2635                         if (!eschandle(ascii))
2636                                 return;
2637                         /* sequence already finished */
2638                 }
2639                 term.esc = 0;
2640                 /*
2641                  * All characters which form part of a sequence are not
2642                  * printed
2643                  */
2644                 return;
2645         }
2646         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2647                 selclear(NULL);
2648
2649         gp = &term.line[term.c.y][term.c.x];
2650         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2651                 gp->mode |= ATTR_WRAP;
2652                 tnewline(1);
2653         }
2654
2655         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2656                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2657
2658         if(term.c.x+width > term.col)
2659                 tnewline(1);
2660
2661         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2662
2663         if(width == 2) {
2664                 gp->mode |= ATTR_WIDE;
2665                 if(term.c.x+1 < term.col) {
2666                         gp[1].c[0] = '\0';
2667                         gp[1].mode = ATTR_WDUMMY;
2668                 }
2669         }
2670         if(term.c.x+width < term.col) {
2671                 tmoveto(term.c.x+width, term.c.y);
2672         } else {
2673                 term.c.state |= CURSOR_WRAPNEXT;
2674         }
2675 }
2676
2677 void
2678 tresize(int col, int row) {
2679         int i;
2680         int minrow = MIN(row, term.row);
2681         int mincol = MIN(col, term.col);
2682         int slide = term.c.y - row + 1;
2683         bool *bp;
2684         TCursor c;
2685
2686         if(col < 1 || row < 1) {
2687                 fprintf(stderr,
2688                         "tresize: error resizing to %dx%d\n", col, row);
2689                 return;
2690         }
2691
2692         /* free unneeded rows */
2693         i = 0;
2694         if(slide > 0) {
2695                 /*
2696                  * slide screen to keep cursor where we expect it -
2697                  * tscrollup would work here, but we can optimize to
2698                  * memmove because we're freeing the earlier lines
2699                  */
2700                 for(/* i = 0 */; i < slide; i++) {
2701                         free(term.line[i]);
2702                         free(term.alt[i]);
2703                 }
2704                 memmove(term.line, term.line + slide, row * sizeof(Line));
2705                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2706         }
2707         for(i += row; i < term.row; i++) {
2708                 free(term.line[i]);
2709                 free(term.alt[i]);
2710         }
2711
2712         /* resize to new height */
2713         term.line = xrealloc(term.line, row * sizeof(Line));
2714         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2715         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2716         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2717
2718         /* resize each row to new width, zero-pad if needed */
2719         for(i = 0; i < minrow; i++) {
2720                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2721                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2722         }
2723
2724         /* allocate any new rows */
2725         for(/* i == minrow */; i < row; i++) {
2726                 term.line[i] = xmalloc(col * sizeof(Glyph));
2727                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2728         }
2729         if(col > term.col) {
2730                 bp = term.tabs + term.col;
2731
2732                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2733                 while(--bp > term.tabs && !*bp)
2734                         /* nothing */ ;
2735                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2736                         *bp = 1;
2737         }
2738         /* update terminal size */
2739         term.col = col;
2740         term.row = row;
2741         /* reset scrolling region */
2742         tsetscroll(0, row-1);
2743         /* make use of the LIMIT in tmoveto */
2744         tmoveto(term.c.x, term.c.y);
2745         /* Clearing both screens (it makes dirty all lines) */
2746         c = term.c;
2747         for(i = 0; i < 2; i++) {
2748                 if(mincol < col && 0 < minrow) {
2749                         tclearregion(mincol, 0, col - 1, minrow - 1);
2750                 }
2751                 if(0 < col && minrow < row) {
2752                         tclearregion(0, minrow, col - 1, row - 1);
2753                 }
2754                 tswapscreen();
2755                 tcursor(CURSOR_LOAD);
2756         }
2757         term.c = c;
2758 }
2759
2760 void
2761 xresize(int col, int row) {
2762         xw.tw = MAX(1, col * xw.cw);
2763         xw.th = MAX(1, row * xw.ch);
2764
2765         XFreePixmap(xw.dpy, xw.buf);
2766         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2767                         DefaultDepth(xw.dpy, xw.scr));
2768         XftDrawChange(xw.draw, xw.buf);
2769         xclear(0, 0, xw.w, xw.h);
2770 }
2771
2772 static inline ushort
2773 sixd_to_16bit(int x) {
2774         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2775 }
2776
2777 void
2778 xloadcols(void) {
2779         int i;
2780         XRenderColor color = { .alpha = 0xffff };
2781         static bool loaded;
2782         Color *cp;
2783
2784         if(loaded) {
2785                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2786                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2787         }
2788
2789         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2790         for(i = 0; i < LEN(colorname); i++) {
2791                 if(!colorname[i])
2792                         continue;
2793                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2794                         die("Could not allocate color '%s'\n", colorname[i]);
2795                 }
2796         }
2797
2798         /* load colors [16-231] ; same colors as xterm */
2799         for(i = 16; i < 6*6*6+16; i++) {
2800                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2801                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2802                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2803                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2804                         die("Could not allocate color %d\n", i);
2805         }
2806
2807         /* load colors [232-255] ; grayscale */
2808         for(; i < 256; i++) {
2809                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2810                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2811                         die("Could not allocate color %d\n", i);
2812         }
2813         loaded = true;
2814 }
2815
2816 int
2817 xsetcolorname(int x, const char *name) {
2818         XRenderColor color = { .alpha = 0xffff };
2819         Color ncolor;
2820
2821         if(!BETWEEN(x, 0, LEN(colorname)))
2822                 return 1;
2823
2824         if(!name) {
2825                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2826                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2827                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2828                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2829                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2830                                                 xw.cmap, &color, &ncolor)) {
2831                                 return 1;
2832                         }
2833
2834                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2835                         dc.col[x] = ncolor;
2836                         return 0;
2837                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2838                         color.red = color.green = color.blue = \
2839                                     0x0808 + 0x0a0a * (x - (16 + 216));
2840                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2841                                                 xw.cmap, &color, &ncolor)) {
2842                                 return 1;
2843                         }
2844
2845                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2846                         dc.col[x] = ncolor;
2847                         return 0;
2848                 } else { /* system colors */
2849                         name = colorname[x];
2850                 }
2851         }
2852         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2853                 return 1;
2854
2855         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2856         dc.col[x] = ncolor;
2857         return 0;
2858 }
2859
2860 void
2861 xtermclear(int col1, int row1, int col2, int row2) {
2862         XftDrawRect(xw.draw,
2863                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2864                         borderpx + col1 * xw.cw,
2865                         borderpx + row1 * xw.ch,
2866                         (col2-col1+1) * xw.cw,
2867                         (row2-row1+1) * xw.ch);
2868 }
2869
2870 /*
2871  * Absolute coordinates.
2872  */
2873 void
2874 xclear(int x1, int y1, int x2, int y2) {
2875         XftDrawRect(xw.draw,
2876                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2877                         x1, y1, x2-x1, y2-y1);
2878 }
2879
2880 void
2881 xhints(void) {
2882         XClassHint class = {opt_class ? opt_class : termname, termname};
2883         XWMHints wm = {.flags = InputHint, .input = 1};
2884         XSizeHints *sizeh = NULL;
2885
2886         sizeh = XAllocSizeHints();
2887
2888         sizeh->flags = PSize | PResizeInc | PBaseSize;
2889         sizeh->height = xw.h;
2890         sizeh->width = xw.w;
2891         sizeh->height_inc = xw.ch;
2892         sizeh->width_inc = xw.cw;
2893         sizeh->base_height = 2 * borderpx;
2894         sizeh->base_width = 2 * borderpx;
2895         if(xw.isfixed == True) {
2896                 sizeh->flags |= PMaxSize | PMinSize;
2897                 sizeh->min_width = sizeh->max_width = xw.w;
2898                 sizeh->min_height = sizeh->max_height = xw.h;
2899         }
2900         if(xw.gm & (XValue|YValue)) {
2901                 sizeh->flags |= USPosition | PWinGravity;
2902                 sizeh->x = xw.l;
2903                 sizeh->y = xw.t;
2904                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2905         }
2906
2907         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2908                         &class);
2909         XFree(sizeh);
2910 }
2911
2912 int
2913 xgeommasktogravity(int mask) {
2914         switch(mask & (XNegative|YNegative)) {
2915         case 0:
2916                 return NorthWestGravity;
2917         case XNegative:
2918                 return NorthEastGravity;
2919         case YNegative:
2920                 return SouthWestGravity;
2921         }
2922         return SouthEastGravity;
2923 }
2924
2925 int
2926 xloadfont(Font *f, FcPattern *pattern) {
2927         FcPattern *match;
2928         FcResult result;
2929
2930         match = FcFontMatch(NULL, pattern, &result);
2931         if(!match)
2932                 return 1;
2933
2934         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2935                 FcPatternDestroy(match);
2936                 return 1;
2937         }
2938
2939         f->set = NULL;
2940         f->pattern = FcPatternDuplicate(pattern);
2941
2942         f->ascent = f->match->ascent;
2943         f->descent = f->match->descent;
2944         f->lbearing = 0;
2945         f->rbearing = f->match->max_advance_width;
2946
2947         f->height = f->ascent + f->descent;
2948         f->width = f->lbearing + f->rbearing;
2949
2950         return 0;
2951 }
2952
2953 void
2954 xloadfonts(char *fontstr, double fontsize) {
2955         FcPattern *pattern;
2956         FcResult r_sz, r_psz;
2957         double fontval;
2958         float ceilf(float);
2959
2960         if(fontstr[0] == '-') {
2961                 pattern = XftXlfdParse(fontstr, False, False);
2962         } else {
2963                 pattern = FcNameParse((FcChar8 *)fontstr);
2964         }
2965
2966         if(!pattern)
2967                 die("st: can't open font %s\n", fontstr);
2968
2969         if(fontsize > 0) {
2970                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2971                 FcPatternDel(pattern, FC_SIZE);
2972                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2973                 usedfontsize = fontsize;
2974         } else {
2975                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2976                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2977                 if(r_psz == FcResultMatch) {
2978                         usedfontsize = fontval;
2979                 } else if(r_sz == FcResultMatch) {
2980                         usedfontsize = -1;
2981                 } else {
2982                         /*
2983                          * Default font size is 12, if none given. This is to
2984                          * have a known usedfontsize value.
2985                          */
2986                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2987                         usedfontsize = 12;
2988                 }
2989         }
2990
2991         FcConfigSubstitute(0, pattern, FcMatchPattern);
2992         FcDefaultSubstitute(pattern);
2993
2994         if(xloadfont(&dc.font, pattern))
2995                 die("st: can't open font %s\n", fontstr);
2996
2997         if(usedfontsize < 0) {
2998                 FcPatternGetDouble(dc.font.match->pattern,
2999                                    FC_PIXEL_SIZE, 0, &fontval);
3000                 usedfontsize = fontval;
3001         }
3002
3003         /* Setting character width and height. */
3004         xw.cw = ceilf(dc.font.width * cwscale);
3005         xw.ch = ceilf(dc.font.height * chscale);
3006
3007         FcPatternDel(pattern, FC_SLANT);
3008         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3009         if(xloadfont(&dc.ifont, pattern))
3010                 die("st: can't open font %s\n", fontstr);
3011
3012         FcPatternDel(pattern, FC_WEIGHT);
3013         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3014         if(xloadfont(&dc.ibfont, pattern))
3015                 die("st: can't open font %s\n", fontstr);
3016
3017         FcPatternDel(pattern, FC_SLANT);
3018         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3019         if(xloadfont(&dc.bfont, pattern))
3020                 die("st: can't open font %s\n", fontstr);
3021
3022         FcPatternDestroy(pattern);
3023 }
3024
3025 int
3026 xloadfontset(Font *f) {
3027         FcResult result;
3028
3029         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3030                 return 1;
3031         return 0;
3032 }
3033
3034 void
3035 xunloadfont(Font *f) {
3036         XftFontClose(xw.dpy, f->match);
3037         FcPatternDestroy(f->pattern);
3038         if(f->set)
3039                 FcFontSetDestroy(f->set);
3040 }
3041
3042 void
3043 xunloadfonts(void) {
3044         /* Free the loaded fonts in the font cache.  */
3045         while(frclen > 0)
3046                 XftFontClose(xw.dpy, frc[--frclen].font);
3047
3048         xunloadfont(&dc.font);
3049         xunloadfont(&dc.bfont);
3050         xunloadfont(&dc.ifont);
3051         xunloadfont(&dc.ibfont);
3052 }
3053
3054 void
3055 xzoom(const Arg *arg) {
3056         xunloadfonts();
3057         xloadfonts(usedfont, usedfontsize + arg->i);
3058         cresize(0, 0);
3059         redraw(0);
3060         xhints();
3061 }
3062
3063 void
3064 xinit(void) {
3065         XGCValues gcvalues;
3066         Cursor cursor;
3067         Window parent;
3068         pid_t thispid = getpid();
3069
3070         if(!(xw.dpy = XOpenDisplay(NULL)))
3071                 die("Can't open display\n");
3072         xw.scr = XDefaultScreen(xw.dpy);
3073         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3074
3075         /* font */
3076         if(!FcInit())
3077                 die("Could not init fontconfig.\n");
3078
3079         usedfont = (opt_font == NULL)? font : opt_font;
3080         xloadfonts(usedfont, 0);
3081
3082         /* colors */
3083         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3084         xloadcols();
3085
3086         /* adjust fixed window geometry */
3087         xw.w = 2 * borderpx + term.col * xw.cw;
3088         xw.h = 2 * borderpx + term.row * xw.ch;
3089         if(xw.gm & XNegative)
3090                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3091         if(xw.gm & YNegative)
3092                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3093
3094         /* Events */
3095         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3096         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3097         xw.attrs.bit_gravity = NorthWestGravity;
3098         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3099                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3100                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3101         xw.attrs.colormap = xw.cmap;
3102
3103         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3104                         XRootWindow(xw.dpy, xw.scr);
3105         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3106                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3107                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3108                         | CWEventMask | CWColormap, &xw.attrs);
3109
3110         memset(&gcvalues, 0, sizeof(gcvalues));
3111         gcvalues.graphics_exposures = False;
3112         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3113                         &gcvalues);
3114         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3115                         DefaultDepth(xw.dpy, xw.scr));
3116         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3117         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3118
3119         /* Xft rendering context */
3120         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3121
3122         /* input methods */
3123         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3124                 XSetLocaleModifiers("@im=local");
3125                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3126                         XSetLocaleModifiers("@im=");
3127                         if((xw.xim = XOpenIM(xw.dpy,
3128                                         NULL, NULL, NULL)) == NULL) {
3129                                 die("XOpenIM failed. Could not open input"
3130                                         " device.\n");
3131                         }
3132                 }
3133         }
3134         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3135                                            | XIMStatusNothing, XNClientWindow, xw.win,
3136                                            XNFocusWindow, xw.win, NULL);
3137         if(xw.xic == NULL)
3138                 die("XCreateIC failed. Could not obtain input method.\n");
3139
3140         /* white cursor, black outline */
3141         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3142         XDefineCursor(xw.dpy, xw.win, cursor);
3143         XRecolorCursor(xw.dpy, cursor,
3144                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3145                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3146
3147         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3148         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3149         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3150         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3151
3152         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3153         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3154                         PropModeReplace, (uchar *)&thispid, 1);
3155
3156         xresettitle();
3157         XMapWindow(xw.dpy, xw.win);
3158         xhints();
3159         XSync(xw.dpy, False);
3160 }
3161
3162 void
3163 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3164         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3165             width = charlen * xw.cw, xp, i;
3166         int frcflags;
3167         int u8fl, u8fblen, u8cblen, doesexist;
3168         char *u8c, *u8fs;
3169         long unicodep;
3170         Font *font = &dc.font;
3171         FcResult fcres;
3172         FcPattern *fcpattern, *fontpattern;
3173         FcFontSet *fcsets[] = { NULL };
3174         FcCharSet *fccharset;
3175         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3176         XRenderColor colfg, colbg;
3177         XRectangle r;
3178         int oneatatime;
3179
3180         frcflags = FRC_NORMAL;
3181
3182         if(base.mode & ATTR_ITALIC) {
3183                 if(base.fg == defaultfg)
3184                         base.fg = defaultitalic;
3185                 font = &dc.ifont;
3186                 frcflags = FRC_ITALIC;
3187         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3188                 if(base.fg == defaultfg)
3189                         base.fg = defaultitalic;
3190                 font = &dc.ibfont;
3191                 frcflags = FRC_ITALICBOLD;
3192         } else if(base.mode & ATTR_UNDERLINE) {
3193                 if(base.fg == defaultfg)
3194                         base.fg = defaultunderline;
3195         }
3196
3197         if(IS_TRUECOL(base.fg)) {
3198                 colfg.alpha = 0xffff;
3199                 colfg.red = TRUERED(base.fg);
3200                 colfg.green = TRUEGREEN(base.fg);
3201                 colfg.blue = TRUEBLUE(base.fg);
3202                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3203                 fg = &truefg;
3204         } else {
3205                 fg = &dc.col[base.fg];
3206         }
3207
3208         if(IS_TRUECOL(base.bg)) {
3209                 colbg.alpha = 0xffff;
3210                 colbg.green = TRUEGREEN(base.bg);
3211                 colbg.red = TRUERED(base.bg);
3212                 colbg.blue = TRUEBLUE(base.bg);
3213                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3214                 bg = &truebg;
3215         } else {
3216                 bg = &dc.col[base.bg];
3217         }
3218
3219         if(base.mode & ATTR_BOLD) {
3220                 /*
3221                  * change basic system colors [0-7]
3222                  * to bright system colors [8-15]
3223                  */
3224                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3225                         fg = &dc.col[base.fg + 8];
3226
3227                 if(base.mode & ATTR_ITALIC) {
3228                         font = &dc.ibfont;
3229                         frcflags = FRC_ITALICBOLD;
3230                 } else {
3231                         font = &dc.bfont;
3232                         frcflags = FRC_BOLD;
3233                 }
3234         }
3235
3236         if(IS_SET(MODE_REVERSE)) {
3237                 if(fg == &dc.col[defaultfg]) {
3238                         fg = &dc.col[defaultbg];
3239                 } else {
3240                         colfg.red = ~fg->color.red;
3241                         colfg.green = ~fg->color.green;
3242                         colfg.blue = ~fg->color.blue;
3243                         colfg.alpha = fg->color.alpha;
3244                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3245                                         &revfg);
3246                         fg = &revfg;
3247                 }
3248
3249                 if(bg == &dc.col[defaultbg]) {
3250                         bg = &dc.col[defaultfg];
3251                 } else {
3252                         colbg.red = ~bg->color.red;
3253                         colbg.green = ~bg->color.green;
3254                         colbg.blue = ~bg->color.blue;
3255                         colbg.alpha = bg->color.alpha;
3256                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3257                                         &revbg);
3258                         bg = &revbg;
3259                 }
3260         }
3261
3262         if(base.mode & ATTR_REVERSE) {
3263                 temp = fg;
3264                 fg = bg;
3265                 bg = temp;
3266         }
3267
3268         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3269                 colfg.red = fg->color.red / 2;
3270                 colfg.green = fg->color.green / 2;
3271                 colfg.blue = fg->color.blue / 2;
3272                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3273                 fg = &revfg;
3274         }
3275
3276         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3277                 fg = bg;
3278
3279         if(base.mode & ATTR_INVISIBLE)
3280                 fg = bg;
3281
3282         /* Intelligent cleaning up of the borders. */
3283         if(x == 0) {
3284                 xclear(0, (y == 0)? 0 : winy, borderpx,
3285                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3286         }
3287         if(x + charlen >= term.col) {
3288                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3289                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3290         }
3291         if(y == 0)
3292                 xclear(winx, 0, winx + width, borderpx);
3293         if(y == term.row-1)
3294                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3295
3296         /* Clean up the region we want to draw to. */
3297         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3298
3299         /* Set the clip region because Xft is sometimes dirty. */
3300         r.x = 0;
3301         r.y = 0;
3302         r.height = xw.ch;
3303         r.width = width;
3304         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3305
3306         for(xp = winx; bytelen > 0;) {
3307                 /*
3308                  * Search for the range in the to be printed string of glyphs
3309                  * that are in the main font. Then print that range. If
3310                  * some glyph is found that is not in the font, do the
3311                  * fallback dance.
3312                  */
3313                 u8fs = s;
3314                 u8fblen = 0;
3315                 u8fl = 0;
3316                 oneatatime = font->width != xw.cw;
3317                 for(;;) {
3318                         u8c = s;
3319                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3320                         s += u8cblen;
3321                         bytelen -= u8cblen;
3322
3323                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3324                         if(doesexist) {
3325                                         u8fl++;
3326                                         u8fblen += u8cblen;
3327                                         if(!oneatatime && bytelen > 0)
3328                                                         continue;
3329                         }
3330
3331                         if(u8fl > 0) {
3332                                 XftDrawStringUtf8(xw.draw, fg,
3333                                                 font->match, xp,
3334                                                 winy + font->ascent,
3335                                                 (FcChar8 *)u8fs,
3336                                                 u8fblen);
3337                                 xp += xw.cw * u8fl;
3338                         }
3339                         break;
3340                 }
3341                 if(doesexist) {
3342                         if(oneatatime)
3343                                 continue;
3344                         break;
3345                 }
3346
3347                 /* Search the font cache. */
3348                 for(i = 0; i < frclen; i++) {
3349                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3350                                         && frc[i].flags == frcflags) {
3351                                 break;
3352                         }
3353                 }
3354
3355                 /* Nothing was found. */
3356                 if(i >= frclen) {
3357                         if(!font->set)
3358                                 xloadfontset(font);
3359                         fcsets[0] = font->set;
3360
3361                         /*
3362                          * Nothing was found in the cache. Now use
3363                          * some dozen of Fontconfig calls to get the
3364                          * font for one single character.
3365                          *
3366                          * Xft and fontconfig are design failures.
3367                          */
3368                         fcpattern = FcPatternDuplicate(font->pattern);
3369                         fccharset = FcCharSetCreate();
3370
3371                         FcCharSetAddChar(fccharset, unicodep);
3372                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3373                                         fccharset);
3374                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3375                                         FcTrue);
3376
3377                         FcConfigSubstitute(0, fcpattern,
3378                                         FcMatchPattern);
3379                         FcDefaultSubstitute(fcpattern);
3380
3381                         fontpattern = FcFontSetMatch(0, fcsets,
3382                                         FcTrue, fcpattern, &fcres);
3383
3384                         /*
3385                          * Overwrite or create the new cache entry.
3386                          */
3387                         if(frclen >= LEN(frc)) {
3388                                 frclen = LEN(frc) - 1;
3389                                 XftFontClose(xw.dpy, frc[frclen].font);
3390                         }
3391
3392                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3393                                         fontpattern);
3394                         frc[frclen].flags = frcflags;
3395
3396                         i = frclen;
3397                         frclen++;
3398
3399                         FcPatternDestroy(fcpattern);
3400                         FcCharSetDestroy(fccharset);
3401                 }
3402
3403                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3404                                 xp, winy + frc[i].font->ascent,
3405                                 (FcChar8 *)u8c, u8cblen);
3406
3407                 xp += xw.cw * wcwidth(unicodep);
3408         }
3409
3410         /*
3411          * This is how the loop above actually should be. Why does the
3412          * application have to care about font details?
3413          *
3414          * I have to repeat: Xft and Fontconfig are design failures.
3415          */
3416         /*
3417         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3418                         winy + font->ascent, (FcChar8 *)s, bytelen);
3419         */
3420
3421         if(base.mode & ATTR_UNDERLINE) {
3422                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3423                                 width, 1);
3424         }
3425
3426         if(base.mode & ATTR_STRUCK) {
3427                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3428                                 width, 1);
3429         }
3430
3431         /* Reset clip to none. */
3432         XftDrawSetClip(xw.draw, 0);
3433 }
3434
3435 void
3436 xdrawcursor(void) {
3437         static int oldx = 0, oldy = 0;
3438         int sl, width, curx;
3439         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3440
3441         LIMIT(oldx, 0, term.col-1);
3442         LIMIT(oldy, 0, term.row-1);
3443
3444         curx = term.c.x;
3445
3446         /* adjust position if in dummy */
3447         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3448                 oldx--;
3449         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3450                 curx--;
3451
3452         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3453
3454         /* remove the old cursor */
3455         sl = utf8len(term.line[oldy][oldx].c);
3456         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3457         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3458                         oldy, width, sl);
3459
3460         /* draw the new one */
3461         if(!(IS_SET(MODE_HIDE))) {
3462                 if(xw.state & WIN_FOCUSED) {
3463                         if(IS_SET(MODE_REVERSE)) {
3464                                 g.mode |= ATTR_REVERSE;
3465                                 g.fg = defaultcs;
3466                                 g.bg = defaultfg;
3467                         }
3468
3469                         sl = utf8len(g.c);
3470                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3471                                 ? 2 : 1;
3472                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3473                 } else {
3474                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3475                                         borderpx + curx * xw.cw,
3476                                         borderpx + term.c.y * xw.ch,
3477                                         xw.cw - 1, 1);
3478                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3479                                         borderpx + curx * xw.cw,
3480                                         borderpx + term.c.y * xw.ch,
3481                                         1, xw.ch - 1);
3482                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3483                                         borderpx + (curx + 1) * xw.cw - 1,
3484                                         borderpx + term.c.y * xw.ch,
3485                                         1, xw.ch - 1);
3486                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3487                                         borderpx + curx * xw.cw,
3488                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3489                                         xw.cw, 1);
3490                 }
3491                 oldx = curx, oldy = term.c.y;
3492         }
3493 }
3494
3495
3496 void
3497 xsettitle(char *p) {
3498         XTextProperty prop;
3499
3500         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3501                         &prop);
3502         XSetWMName(xw.dpy, xw.win, &prop);
3503         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3504         XFree(prop.value);
3505 }
3506
3507 void
3508 xresettitle(void) {
3509         xsettitle(opt_title ? opt_title : "st");
3510 }
3511
3512 void
3513 redraw(int timeout) {
3514         struct timespec tv = {0, timeout * 1000};
3515
3516         tfulldirt();
3517         draw();
3518
3519         if(timeout > 0) {
3520                 nanosleep(&tv, NULL);
3521                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3522         }
3523 }
3524
3525 void
3526 draw(void) {
3527         drawregion(0, 0, term.col, term.row);
3528         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3529                         xw.h, 0, 0);
3530         XSetForeground(xw.dpy, dc.gc,
3531                         dc.col[IS_SET(MODE_REVERSE)?
3532                                 defaultfg : defaultbg].pixel);
3533 }
3534
3535 void
3536 drawregion(int x1, int y1, int x2, int y2) {
3537         int ic, ib, x, y, ox, sl;
3538         Glyph base, new;
3539         char buf[DRAW_BUF_SIZ];
3540         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3541         long unicodep;
3542
3543         if(!(xw.state & WIN_VISIBLE))
3544                 return;
3545
3546         for(y = y1; y < y2; y++) {
3547                 if(!term.dirty[y])
3548                         continue;
3549
3550                 xtermclear(0, y, term.col, y);
3551                 term.dirty[y] = 0;
3552                 base = term.line[y][0];
3553                 ic = ib = ox = 0;
3554                 for(x = x1; x < x2; x++) {
3555                         new = term.line[y][x];
3556                         if(new.mode == ATTR_WDUMMY)
3557                                 continue;
3558                         if(ena_sel && selected(x, y))
3559                                 new.mode ^= ATTR_REVERSE;
3560                         if(ib > 0 && (ATTRCMP(base, new)
3561                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3562                                 xdraws(buf, base, ox, y, ic, ib);
3563                                 ic = ib = 0;
3564                         }
3565                         if(ib == 0) {
3566                                 ox = x;
3567                                 base = new;
3568                         }
3569
3570                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3571                         memcpy(buf+ib, new.c, sl);
3572                         ib += sl;
3573                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3574                 }
3575                 if(ib > 0)
3576                         xdraws(buf, base, ox, y, ic, ib);
3577         }
3578         xdrawcursor();
3579 }
3580
3581 void
3582 expose(XEvent *ev) {
3583         XExposeEvent *e = &ev->xexpose;
3584
3585         if(xw.state & WIN_REDRAW) {
3586                 if(!e->count)
3587                         xw.state &= ~WIN_REDRAW;
3588         }
3589         redraw(0);
3590 }
3591
3592 void
3593 visibility(XEvent *ev) {
3594         XVisibilityEvent *e = &ev->xvisibility;
3595
3596         if(e->state == VisibilityFullyObscured) {
3597                 xw.state &= ~WIN_VISIBLE;
3598         } else if(!(xw.state & WIN_VISIBLE)) {
3599                 /* need a full redraw for next Expose, not just a buf copy */
3600                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3601         }
3602 }
3603
3604 void
3605 unmap(XEvent *ev) {
3606         xw.state &= ~WIN_VISIBLE;
3607 }
3608
3609 void
3610 xsetpointermotion(int set) {
3611         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3612         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3613 }
3614
3615 void
3616 xseturgency(int add) {
3617         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3618
3619         MODBIT(h->flags, add, XUrgencyHint);
3620         XSetWMHints(xw.dpy, xw.win, h);
3621         XFree(h);
3622 }
3623
3624 void
3625 focus(XEvent *ev) {
3626         XFocusChangeEvent *e = &ev->xfocus;
3627
3628         if(e->mode == NotifyGrab)
3629                 return;
3630
3631         if(ev->type == FocusIn) {
3632                 XSetICFocus(xw.xic);
3633                 xw.state |= WIN_FOCUSED;
3634                 xseturgency(0);
3635                 if(IS_SET(MODE_FOCUS))
3636                         ttywrite("\033[I", 3);
3637         } else {
3638                 XUnsetICFocus(xw.xic);
3639                 xw.state &= ~WIN_FOCUSED;
3640                 if(IS_SET(MODE_FOCUS))
3641                         ttywrite("\033[O", 3);
3642         }
3643 }
3644
3645 static inline bool
3646 match(uint mask, uint state) {
3647         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3648 }
3649
3650 void
3651 numlock(const Arg *dummy) {
3652         term.numlock ^= 1;
3653 }
3654
3655 char*
3656 kmap(KeySym k, uint state) {
3657         Key *kp;
3658         int i;
3659
3660         /* Check for mapped keys out of X11 function keys. */
3661         for(i = 0; i < LEN(mappedkeys); i++) {
3662                 if(mappedkeys[i] == k)
3663                         break;
3664         }
3665         if(i == LEN(mappedkeys)) {
3666                 if((k & 0xFFFF) < 0xFD00)
3667                         return NULL;
3668         }
3669
3670         for(kp = key; kp < key + LEN(key); kp++) {
3671                 if(kp->k != k)
3672                         continue;
3673
3674                 if(!match(kp->mask, state))
3675                         continue;
3676
3677                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3678                         continue;
3679                 if(term.numlock && kp->appkey == 2)
3680                         continue;
3681
3682                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3683                         continue;
3684
3685                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3686                         continue;
3687
3688                 return kp->s;
3689         }
3690
3691         return NULL;
3692 }
3693
3694 void
3695 kpress(XEvent *ev) {
3696         XKeyEvent *e = &ev->xkey;
3697         KeySym ksym;
3698         char buf[32], *customkey;
3699         int len;
3700         long c;
3701         Status status;
3702         Shortcut *bp;
3703
3704         if(IS_SET(MODE_KBDLOCK))
3705                 return;
3706
3707         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3708         /* 1. shortcuts */
3709         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3710                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3711                         bp->func(&(bp->arg));
3712                         return;
3713                 }
3714         }
3715
3716         /* 2. custom keys from config.h */
3717         if((customkey = kmap(ksym, e->state))) {
3718                 ttysend(customkey, strlen(customkey));
3719                 return;
3720         }
3721
3722         /* 3. composed string from input method */
3723         if(len == 0)
3724                 return;
3725         if(len == 1 && e->state & Mod1Mask) {
3726                 if(IS_SET(MODE_8BIT)) {
3727                         if(*buf < 0177) {
3728                                 c = *buf | 0x80;
3729                                 len = utf8encode(c, buf, UTF_SIZ);
3730                         }
3731                 } else {
3732                         buf[1] = buf[0];
3733                         buf[0] = '\033';
3734                         len = 2;
3735                 }
3736         }
3737         ttysend(buf, len);
3738 }
3739
3740
3741 void
3742 cmessage(XEvent *e) {
3743         /*
3744          * See xembed specs
3745          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3746          */
3747         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3748                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3749                         xw.state |= WIN_FOCUSED;
3750                         xseturgency(0);
3751                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3752                         xw.state &= ~WIN_FOCUSED;
3753                 }
3754         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3755                 /* Send SIGHUP to shell */
3756                 kill(pid, SIGHUP);
3757                 exit(EXIT_SUCCESS);
3758         }
3759 }
3760
3761 void
3762 cresize(int width, int height) {
3763         int col, row;
3764
3765         if(width != 0)
3766                 xw.w = width;
3767         if(height != 0)
3768                 xw.h = height;
3769
3770         col = (xw.w - 2 * borderpx) / xw.cw;
3771         row = (xw.h - 2 * borderpx) / xw.ch;
3772
3773         tresize(col, row);
3774         xresize(col, row);
3775         ttyresize();
3776 }
3777
3778 void
3779 resize(XEvent *e) {
3780         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3781                 return;
3782
3783         cresize(e->xconfigure.width, e->xconfigure.height);
3784 }
3785
3786 void
3787 run(void) {
3788         XEvent ev;
3789         int w = xw.w, h = xw.h;
3790         fd_set rfd;
3791         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3792         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3793         long deltatime;
3794
3795         /* Waiting for window mapping */
3796         while(1) {
3797                 XNextEvent(xw.dpy, &ev);
3798                 if(XFilterEvent(&ev, None))
3799                         continue;
3800                 if(ev.type == ConfigureNotify) {
3801                         w = ev.xconfigure.width;
3802                         h = ev.xconfigure.height;
3803                 } else if(ev.type == MapNotify) {
3804                         break;
3805                 }
3806         }
3807
3808         ttynew();
3809         cresize(w, h);
3810
3811         clock_gettime(CLOCK_MONOTONIC, &last);
3812         lastblink = last;
3813
3814         for(xev = actionfps;;) {
3815                 FD_ZERO(&rfd);
3816                 FD_SET(cmdfd, &rfd);
3817                 FD_SET(xfd, &rfd);
3818
3819                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3820                         if(errno == EINTR)
3821                                 continue;
3822                         die("select failed: %s\n", strerror(errno));
3823                 }
3824                 if(FD_ISSET(cmdfd, &rfd)) {
3825                         ttyread();
3826                         if(blinktimeout) {
3827                                 blinkset = tattrset(ATTR_BLINK);
3828                                 if(!blinkset)
3829                                         MODBIT(term.mode, 0, MODE_BLINK);
3830                         }
3831                 }
3832
3833                 if(FD_ISSET(xfd, &rfd))
3834                         xev = actionfps;
3835
3836                 clock_gettime(CLOCK_MONOTONIC, &now);
3837                 drawtimeout.tv_sec = 0;
3838                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3839                 tv = &drawtimeout;
3840
3841                 dodraw = 0;
3842                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3843                         tsetdirtattr(ATTR_BLINK);
3844                         term.mode ^= MODE_BLINK;
3845                         lastblink = now;
3846                         dodraw = 1;
3847                 }
3848                 deltatime = TIMEDIFF(now, last);
3849                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3850                                 || deltatime < 0) {
3851                         dodraw = 1;
3852                         last = now;
3853                 }
3854
3855                 if(dodraw) {
3856                         while(XPending(xw.dpy)) {
3857                                 XNextEvent(xw.dpy, &ev);
3858                                 if(XFilterEvent(&ev, None))
3859                                         continue;
3860                                 if(handler[ev.type])
3861                                         (handler[ev.type])(&ev);
3862                         }
3863
3864                         draw();
3865                         XFlush(xw.dpy);
3866
3867                         if(xev && !FD_ISSET(xfd, &rfd))
3868                                 xev--;
3869                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3870                                 if(blinkset) {
3871                                         if(TIMEDIFF(now, lastblink) \
3872                                                         > blinktimeout) {
3873                                                 drawtimeout.tv_nsec = 1000;
3874                                         } else {
3875                                                 drawtimeout.tv_nsec = (1E6 * \
3876                                                         (blinktimeout - \
3877                                                         TIMEDIFF(now,
3878                                                                 lastblink)));
3879                                         }
3880                                 } else {
3881                                         tv = NULL;
3882                                 }
3883                         }
3884                 }
3885         }
3886 }
3887
3888 void
3889 usage(void) {
3890         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3891         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3892         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3893 }
3894
3895 int
3896 main(int argc, char *argv[]) {
3897         char *titles;
3898         uint cols = 80, rows = 24;
3899
3900         xw.l = xw.t = 0;
3901         xw.isfixed = False;
3902
3903         ARGBEGIN {
3904         case 'a':
3905                 allowaltscreen = false;
3906                 break;
3907         case 'c':
3908                 opt_class = EARGF(usage());
3909                 break;
3910         case 'e':
3911                 /* eat all remaining arguments */
3912                 if(argc > 1) {
3913                         opt_cmd = &argv[1];
3914                         if(argv[1] != NULL && opt_title == NULL) {
3915                                 titles = xstrdup(argv[1]);
3916                                 opt_title = basename(titles);
3917                         }
3918                 }
3919                 goto run;
3920         case 'f':
3921                 opt_font = EARGF(usage());
3922                 break;
3923         case 'g':
3924                 xw.gm = XParseGeometry(EARGF(usage()),
3925                                 &xw.l, &xw.t, &cols, &rows);
3926                 break;
3927         case 'i':
3928                 xw.isfixed = True;
3929                 break;
3930         case 'o':
3931                 opt_io = EARGF(usage());
3932                 break;
3933         case 't':
3934                 opt_title = EARGF(usage());
3935                 break;
3936         case 'w':
3937                 opt_embed = EARGF(usage());
3938                 break;
3939         case 'v':
3940         default:
3941                 usage();
3942         } ARGEND;
3943
3944 run:
3945         setlocale(LC_CTYPE, "");
3946         XSetLocaleModifiers("");
3947         tnew(cols? cols : 1, rows? rows : 1);
3948         xinit();
3949         selinit();
3950         run();
3951
3952         return 0;
3953 }
3954