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 <X11/XKBlib.h>
  31 #include <fontconfig/fontconfig.h>
  32 #include <wchar.h>
  33
  34 #include "arg.h"
  35
  36 char *argv0;
  37
  38 #define Glyph Glyph_
  39 #define Font Font_
  40
  41 #if   defined(__linux)
  42  #include <pty.h>
  43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  44  #include <util.h>
  45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  46  #include <libutil.h>
  47 #endif
  48
  49
  50 /* XEMBED messages */
  51 #define XEMBED_FOCUS_IN  4
  52 #define XEMBED_FOCUS_OUT 5
  53
  54 /* Arbitrary sizes */
  55 #define UTF_INVALID   0xFFFD
  56 #define UTF_SIZ       4
  57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  58 #define ESC_ARG_SIZ   16
  59 #define STR_BUF_SIZ   ESC_BUF_SIZ
  60 #define STR_ARG_SIZ   ESC_ARG_SIZ
  61 #define DRAW_BUF_SIZ  20*1024
  62 #define XK_ANY_MOD    UINT_MAX
  63 #define XK_NO_MOD     0
  64 #define XK_SWITCH_MOD (1<<13)
  65
  66 /* macros */
  67 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  68 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  69 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  70 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  71 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  72 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  73 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  74 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  75 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  76 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  77 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  78 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  79 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  80
  81 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  82 #define IS_TRUECOL(x)    (1 << 24 & (x))
  83 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  84 #define TRUEGREEN(x)     (((x) & 0xff00))
  85 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  86
  87
  88 enum glyph_attribute {
  89         ATTR_NULL      = 0,
  90         ATTR_BOLD      = 1 << 0,
  91         ATTR_FAINT     = 1 << 1,
  92         ATTR_ITALIC    = 1 << 2,
  93         ATTR_UNDERLINE = 1 << 3,
  94         ATTR_BLINK     = 1 << 4,
  95         ATTR_REVERSE   = 1 << 5,
  96         ATTR_INVISIBLE = 1 << 6,
  97         ATTR_STRUCK    = 1 << 7,
  98         ATTR_WRAP      = 1 << 8,
  99         ATTR_WIDE      = 1 << 9,
 100         ATTR_WDUMMY    = 1 << 10,
 101 };
 102
 103 enum cursor_movement {
 104         CURSOR_SAVE,
 105         CURSOR_LOAD
 106 };
 107
 108 enum cursor_state {
 109         CURSOR_DEFAULT  = 0,
 110         CURSOR_WRAPNEXT = 1,
 111         CURSOR_ORIGIN   = 2
 112 };
 113
 114 enum term_mode {
 115         MODE_WRAP        = 1 << 0,
 116         MODE_INSERT      = 1 << 1,
 117         MODE_APPKEYPAD   = 1 << 2,
 118         MODE_ALTSCREEN   = 1 << 3,
 119         MODE_CRLF        = 1 << 4,
 120         MODE_MOUSEBTN    = 1 << 5,
 121         MODE_MOUSEMOTION = 1 << 6,
 122         MODE_REVERSE     = 1 << 7,
 123         MODE_KBDLOCK     = 1 << 8,
 124         MODE_HIDE        = 1 << 9,
 125         MODE_ECHO        = 1 << 10,
 126         MODE_APPCURSOR   = 1 << 11,
 127         MODE_MOUSESGR    = 1 << 12,
 128         MODE_8BIT        = 1 << 13,
 129         MODE_BLINK       = 1 << 14,
 130         MODE_FBLINK      = 1 << 15,
 131         MODE_FOCUS       = 1 << 16,
 132         MODE_MOUSEX10    = 1 << 17,
 133         MODE_MOUSEMANY   = 1 << 18,
 134         MODE_BRCKTPASTE  = 1 << 19,
 135         MODE_PRINT       = 1 << 20,
 136         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 137                           |MODE_MOUSEMANY,
 138 };
 139
 140 enum charset {
 141         CS_GRAPHIC0,
 142         CS_GRAPHIC1,
 143         CS_UK,
 144         CS_USA,
 145         CS_MULTI,
 146         CS_GER,
 147         CS_FIN
 148 };
 149
 150 enum escape_state {
 151         ESC_START      = 1,
 152         ESC_CSI        = 2,
 153         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 154         ESC_ALTCHARSET = 8,
 155         ESC_STR_END    = 16, /* a final string was encountered */
 156         ESC_TEST       = 32, /* Enter in test mode */
 157 };
 158
 159 enum window_state {
 160         WIN_VISIBLE = 1,
 161         WIN_REDRAW  = 2,
 162         WIN_FOCUSED = 4
 163 };
 164
 165 enum selection_type {
 166         SEL_REGULAR = 1,
 167         SEL_RECTANGULAR = 2
 168 };
 169
 170 enum selection_snap {
 171         SNAP_WORD = 1,
 172         SNAP_LINE = 2
 173 };
 174
 175 typedef unsigned char uchar;
 176 typedef unsigned int uint;
 177 typedef unsigned long ulong;
 178 typedef unsigned short ushort;
 179
 180 typedef XftDraw *Draw;
 181 typedef XftColor Color;
 182
 183 typedef struct {
 184         char c[UTF_SIZ]; /* character code */
 185         ushort mode;      /* attribute flags */
 186         uint32_t fg;      /* foreground  */
 187         uint32_t bg;      /* background  */
 188 } Glyph;
 189
 190 typedef Glyph *Line;
 191
 192 typedef struct {
 193         Glyph attr; /* current char attributes */
 194         int x;
 195         int y;
 196         char state;
 197 } TCursor;
 198
 199 /* CSI Escape sequence structs */
 200 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 201 typedef struct {
 202         char buf[ESC_BUF_SIZ]; /* raw string */
 203         int len;               /* raw string length */
 204         char priv;
 205         int arg[ESC_ARG_SIZ];
 206         int narg;              /* nb of args */
 207         char mode;
 208 } CSIEscape;
 209
 210 /* STR Escape sequence structs */
 211 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 212 typedef struct {
 213         char type;             /* ESC type ... */
 214         char buf[STR_BUF_SIZ]; /* raw string */
 215         int len;               /* raw string length */
 216         char *args[STR_ARG_SIZ];
 217         int narg;              /* nb of args */
 218 } STREscape;
 219
 220 /* Internal representation of the screen */
 221 typedef struct {
 222         int row;      /* nb row */
 223         int col;      /* nb col */
 224         Line *line;   /* screen */
 225         Line *alt;    /* alternate screen */
 226         bool *dirty;  /* dirtyness of lines */
 227         TCursor c;    /* cursor */
 228         int top;      /* top    scroll limit */
 229         int bot;      /* bottom scroll limit */
 230         int mode;     /* terminal mode flags */
 231         int esc;      /* escape state flags */
 232         char trantbl[4]; /* charset table translation */
 233         int charset;  /* current charset */
 234         int icharset; /* selected charset for sequence */
 235         bool numlock; /* lock numbers in keyboard */
 236         bool *tabs;
 237 } Term;
 238
 239 /* Purely graphic info */
 240 typedef struct {
 241         Display *dpy;
 242         Colormap cmap;
 243         Window win;
 244         Drawable buf;
 245         Atom xembed, wmdeletewin, netwmname, netwmpid;
 246         XIM xim;
 247         XIC xic;
 248         Draw draw;
 249         Visual *vis;
 250         XSetWindowAttributes attrs;
 251         int scr;
 252         bool isfixed; /* is fixed geometry? */
 253         int l, t; /* left and top offset */
 254         int gm; /* geometry mask */
 255         int tw, th; /* tty width and height */
 256         int w, h; /* window width and height */
 257         int ch; /* char height */
 258         int cw; /* char width  */
 259         char state; /* focus, redraw, visible */
 260 } XWindow;
 261
 262 typedef struct {
 263         uint b;
 264         uint mask;
 265         char *s;
 266 } Mousekey;
 267
 268 typedef struct {
 269         KeySym k;
 270         uint mask;
 271         char *s;
 272         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 273         signed char appkey;    /* application keypad */
 274         signed char appcursor; /* application cursor */
 275         signed char crlf;      /* crlf mode          */
 276 } Key;
 277
 278 typedef struct {
 279         int mode;
 280         int type;
 281         int snap;
 282         /*
 283          * Selection variables:
 284          * nb – normalized coordinates of the beginning of the selection
 285          * ne – normalized coordinates of the end of the selection
 286          * ob – original coordinates of the beginning of the selection
 287          * oe – original coordinates of the end of the selection
 288          */
 289         struct {
 290                 int x, y;
 291         } nb, ne, ob, oe;
 292
 293         char *clip;
 294         Atom xtarget;
 295         bool alt;
 296         struct timespec tclick1;
 297         struct timespec tclick2;
 298 } Selection;
 299
 300 typedef union {
 301         int i;
 302         uint ui;
 303         float f;
 304         const void *v;
 305 } Arg;
 306
 307 typedef struct {
 308         uint mod;
 309         KeySym keysym;
 310         void (*func)(const Arg *);
 311         const Arg arg;
 312 } Shortcut;
 313
 314 /* function definitions used in config.h */
 315 static void clippaste(const Arg *);
 316 static void numlock(const Arg *);
 317 static void selpaste(const Arg *);
 318 static void xzoom(const Arg *);
 319 static void xzoomabs(const Arg *);
 320 static void xzoomreset(const Arg *);
 321 static void printsel(const Arg *);
 322 static void printscreen(const Arg *) ;
 323 static void toggleprinter(const Arg *);
 324
 325 /* Config.h for applying patches and the configuration. */
 326 #include "config.h"
 327
 328 /* Font structure */
 329 typedef struct {
 330         int height;
 331         int width;
 332         int ascent;
 333         int descent;
 334         short lbearing;
 335         short rbearing;
 336         XftFont *match;
 337         FcFontSet *set;
 338         FcPattern *pattern;
 339 } Font;
 340
 341 /* Drawing Context */
 342 typedef struct {
 343         Color col[MAX(LEN(colorname), 256)];
 344         Font font, bfont, ifont, ibfont;
 345         GC gc;
 346 } DC;
 347
 348 static void die(const char *, ...);
 349 static void draw(void);
 350 static void redraw(void);
 351 static void drawregion(int, int, int, int);
 352 static void execsh(void);
 353 static void sigchld(int);
 354 static void run(void);
 355
 356 static void csidump(void);
 357 static void csihandle(void);
 358 static void csiparse(void);
 359 static void csireset(void);
 360 static int eschandle(uchar ascii);
 361 static void strdump(void);
 362 static void strhandle(void);
 363 static void strparse(void);
 364 static void strreset(void);
 365
 366 static int tattrset(int);
 367 static void tprinter(char *, size_t);
 368 static void tdumpsel(void);
 369 static void tdumpline(int);
 370 static void tdump(void);
 371 static void tclearregion(int, int, int, int);
 372 static void tcursor(int);
 373 static void tdeletechar(int);
 374 static void tdeleteline(int);
 375 static void tinsertblank(int);
 376 static void tinsertblankline(int);
 377 static int tlinelen(int);
 378 static void tmoveto(int, int);
 379 static void tmoveato(int, int);
 380 static void tnew(int, int);
 381 static void tnewline(int);
 382 static void tputtab(int);
 383 static void tputc(char *, int);
 384 static void treset(void);
 385 static void tresize(int, int);
 386 static void tscrollup(int, int);
 387 static void tscrolldown(int, int);
 388 static void tsetattr(int *, int);
 389 static void tsetchar(char *, Glyph *, int, int);
 390 static void tsetscroll(int, int);
 391 static void tswapscreen(void);
 392 static void tsetdirt(int, int);
 393 static void tsetdirtattr(int);
 394 static void tsetmode(bool, bool, int *, int);
 395 static void tfulldirt(void);
 396 static void techo(char *, int);
 397 static void tcontrolcode(uchar );
 398 static void tdectest(char );
 399 static int32_t tdefcolor(int *, int *, int);
 400 static void tdeftran(char);
 401 static inline bool match(uint, uint);
 402 static void ttynew(void);
 403 static void ttyread(void);
 404 static void ttyresize(void);
 405 static void ttysend(char *, size_t);
 406 static void ttywrite(const char *, size_t);
 407 static void tstrsequence(uchar c);
 408
 409 static void xdraws(char *, Glyph, int, int, int, int);
 410 static void xhints(void);
 411 static void xclear(int, int, int, int);
 412 static void xdrawcursor(void);
 413 static void xinit(void);
 414 static void xloadcols(void);
 415 static int xsetcolorname(int, const char *);
 416 static int xgeommasktogravity(int);
 417 static int xloadfont(Font *, FcPattern *);
 418 static void xloadfonts(char *, double);
 419 static int xloadfontset(Font *);
 420 static void xsettitle(char *);
 421 static void xresettitle(void);
 422 static void xsetpointermotion(int);
 423 static void xseturgency(int);
 424 static void xsetsel(char *);
 425 static void xtermclear(int, int, int, int);
 426 static void xunloadfont(Font *);
 427 static void xunloadfonts(void);
 428 static void xresize(int, int);
 429
 430 static void expose(XEvent *);
 431 static void visibility(XEvent *);
 432 static void unmap(XEvent *);
 433 static char *kmap(KeySym, uint);
 434 static void kpress(XEvent *);
 435 static void cmessage(XEvent *);
 436 static void cresize(int, int);
 437 static void resize(XEvent *);
 438 static void focus(XEvent *);
 439 static void brelease(XEvent *);
 440 static void bpress(XEvent *);
 441 static void bmotion(XEvent *);
 442 static void selnotify(XEvent *);
 443 static void selclear(XEvent *);
 444 static void selrequest(XEvent *);
 445
 446 static void selinit(void);
 447 static void selnormalize(void);
 448 static inline bool selected(int, int);
 449 static char *getsel(void);
 450 static void selcopy(void);
 451 static void selscroll(int, int);
 452 static void selsnap(int, int *, int *, int);
 453 static void getbuttoninfo(XEvent *);
 454 static void mousereport(XEvent *);
 455
 456 static size_t utf8decode(char *, long *, size_t);
 457 static long utf8decodebyte(char, size_t *);
 458 static size_t utf8encode(long, char *, size_t);
 459 static char utf8encodebyte(long, size_t);
 460 static size_t utf8len(char *);
 461 static size_t utf8validate(long *, size_t);
 462
 463 static ssize_t xwrite(int, const char *, size_t);
 464 static void *xmalloc(size_t);
 465 static void *xrealloc(void *, size_t);
 466 static char *xstrdup(char *);
 467
 468 static void usage(void);
 469
 470 static void (*handler[LASTEvent])(XEvent *) = {
 471         [KeyPress] = kpress,
 472         [ClientMessage] = cmessage,
 473         [ConfigureNotify] = resize,
 474         [VisibilityNotify] = visibility,
 475         [UnmapNotify] = unmap,
 476         [Expose] = expose,
 477         [FocusIn] = focus,
 478         [FocusOut] = focus,
 479         [MotionNotify] = bmotion,
 480         [ButtonPress] = bpress,
 481         [ButtonRelease] = brelease,
 482         [SelectionClear] = selclear,
 483         [SelectionNotify] = selnotify,
 484         [SelectionRequest] = selrequest,
 485 };
 486
 487 /* Globals */
 488 static DC dc;
 489 static XWindow xw;
 490 static Term term;
 491 static CSIEscape csiescseq;
 492 static STREscape strescseq;
 493 static int cmdfd;
 494 static pid_t pid;
 495 static Selection sel;
 496 static int iofd = STDOUT_FILENO;
 497 static char **opt_cmd = NULL;
 498 static char *opt_io = NULL;
 499 static char *opt_title = NULL;
 500 static char *opt_embed = NULL;
 501 static char *opt_class = NULL;
 502 static char *opt_font = NULL;
 503 static int oldbutton = 3; /* button event on startup: 3 = release */
 504
 505 static char *usedfont = NULL;
 506 static double usedfontsize = 0;
 507 static double defaultfontsize = 0;
 508
 509 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 510 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 511 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 512 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 513
 514 /* Font Ring Cache */
 515 enum {
 516         FRC_NORMAL,
 517         FRC_ITALIC,
 518         FRC_BOLD,
 519         FRC_ITALICBOLD
 520 };
 521
 522 typedef struct {
 523         XftFont *font;
 524         int flags;
 525 } Fontcache;
 526
 527 /* Fontcache is an array now. A new font will be appended to the array. */
 528 static Fontcache frc[16];
 529 static int frclen = 0;
 530
 531 ssize_t
 532 xwrite(int fd, const char *s, size_t len) {
 533         size_t aux = len;
 534
 535         while(len > 0) {
 536                 ssize_t r = write(fd, s, len);
 537                 if(r < 0)
 538                         return r;
 539                 len -= r;
 540                 s += r;
 541         }
 542         return aux;
 543 }
 544
 545 void *
 546 xmalloc(size_t len) {
 547         void *p = malloc(len);
 548
 549         if(!p)
 550                 die("Out of memory\n");
 551
 552         return p;
 553 }
 554
 555 void *
 556 xrealloc(void *p, size_t len) {
 557         if((p = realloc(p, len)) == NULL)
 558                 die("Out of memory\n");
 559
 560         return p;
 561 }
 562
 563 char *
 564 xstrdup(char *s) {
 565         if((s = strdup(s)) == NULL)
 566                 die("Out of memory\n");
 567
 568         return s;
 569 }
 570
 571 size_t
 572 utf8decode(char *c, long *u, size_t clen) {
 573         size_t i, j, len, type;
 574         long udecoded;
 575
 576         *u = UTF_INVALID;
 577         if(!clen)
 578                 return 0;
 579         udecoded = utf8decodebyte(c[0], &len);
 580         if(!BETWEEN(len, 1, UTF_SIZ))
 581                 return 1;
 582         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 583                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 584                 if(type != 0)
 585                         return j;
 586         }
 587         if(j < len)
 588                 return 0;
 589         *u = udecoded;
 590         utf8validate(u, len);
 591         return len;
 592 }
 593
 594 long
 595 utf8decodebyte(char c, size_t *i) {
 596         for(*i = 0; *i < LEN(utfmask); ++(*i))
 597                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 598                         return (uchar)c & ~utfmask[*i];
 599         return 0;
 600 }
 601
 602 size_t
 603 utf8encode(long u, char *c, size_t clen) {
 604         size_t len, i;
 605
 606         len = utf8validate(&u, 0);
 607         if(clen < len)
 608                 return 0;
 609         for(i = len - 1; i != 0; --i) {
 610                 c[i] = utf8encodebyte(u, 0);
 611                 u >>= 6;
 612         }
 613         c[0] = utf8encodebyte(u, len);
 614         return len;
 615 }
 616
 617 char
 618 utf8encodebyte(long u, size_t i) {
 619         return utfbyte[i] | (u & ~utfmask[i]);
 620 }
 621
 622 size_t
 623 utf8len(char *c) {
 624         return utf8decode(c, &(long){0}, UTF_SIZ);
 625 }
 626
 627 size_t
 628 utf8validate(long *u, size_t i) {
 629         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 630                 *u = UTF_INVALID;
 631         for(i = 1; *u > utfmax[i]; ++i)
 632                 ;
 633         return i;
 634 }
 635
 636 static void
 637 selinit(void) {
 638         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 639         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 640         sel.mode = 0;
 641         sel.ob.x = -1;
 642         sel.clip = NULL;
 643         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 644         if(sel.xtarget == None)
 645                 sel.xtarget = XA_STRING;
 646 }
 647
 648 static int
 649 x2col(int x) {
 650         x -= borderpx;
 651         x /= xw.cw;
 652
 653         return LIMIT(x, 0, term.col-1);
 654 }
 655
 656 static int
 657 y2row(int y) {
 658         y -= borderpx;
 659         y /= xw.ch;
 660
 661         return LIMIT(y, 0, term.row-1);
 662 }
 663
 664 static int tlinelen(int y) {
 665         int i = term.col;
 666
 667         if(term.line[y][i - 1].mode & ATTR_WRAP)
 668                 return i;
 669
 670         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
 671                 --i;
 672
 673         return i;
 674 }
 675
 676 static void
 677 selnormalize(void) {
 678         int i;
 679
 680         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 681                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 682                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 683         } else {
 684                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 685                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 686         }
 687         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 688         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 689
 690         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
 691         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
 692
 693         /* expand selection over line breaks */
 694         if (sel.type == SEL_RECTANGULAR)
 695                 return;
 696         i = tlinelen(sel.nb.y);
 697         if (i < sel.nb.x)
 698                 sel.nb.x = i;
 699         if (tlinelen(sel.ne.y) <= sel.ne.x)
 700                 sel.ne.x = term.col - 1;
 701 }
 702
 703 static inline bool
 704 selected(int x, int y) {
 705         if(sel.type == SEL_RECTANGULAR)
 706                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 707                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 708
 709         return BETWEEN(y, sel.nb.y, sel.ne.y)
 710             && (y != sel.nb.y || x >= sel.nb.x)
 711             && (y != sel.ne.y || x <= sel.ne.x);
 712 }
 713
 714 void
 715 selsnap(int mode, int *x, int *y, int direction) {
 716         int newx, newy, xt, yt;
 717         bool delim, prevdelim;
 718         Glyph *gp, *prevgp;
 719
 720         switch(mode) {
 721         case SNAP_WORD:
 722                 /*
 723                  * Snap around if the word wraps around at the end or
 724                  * beginning of a line.
 725                  */
 726                 prevgp = &term.line[*y][*x];
 727                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
 728                 for(;;) {
 729                         newx = *x + direction;
 730                         newy = *y;
 731                         if(!BETWEEN(newx, 0, term.col - 1)) {
 732                                 newy += direction;
 733                                 newx = (newx + term.col) % term.col;
 734                                 if (!BETWEEN(newy, 0, term.row - 1))
 735                                         break;
 736
 737                                 if(direction > 0)
 738                                         yt = *y, xt = *x;
 739                                 else
 740                                         yt = newy, xt = newx;
 741                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 742                                         break;
 743                         }
 744
 745                         if (newx >= tlinelen(newy))
 746                                 break;
 747
 748                         gp = &term.line[newy][newx];
 749                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
 750                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 751                                         || (delim && gp->c[0] != prevgp->c[0])))
 752                                 break;
 753
 754                         *x = newx;
 755                         *y = newy;
 756                         prevgp = gp;
 757                         prevdelim = delim;
 758                 }
 759                 break;
 760         case SNAP_LINE:
 761                 /*
 762                  * Snap around if the the previous line or the current one
 763                  * has set ATTR_WRAP at its end. Then the whole next or
 764                  * previous line will be selected.
 765                  */
 766                 *x = (direction < 0) ? 0 : term.col - 1;
 767                 if(direction < 0 && *y > 0) {
 768                         for(; *y > 0; *y += direction) {
 769                                 if(!(term.line[*y-1][term.col-1].mode
 770                                                 & ATTR_WRAP)) {
 771                                         break;
 772                                 }
 773                         }
 774                 } else if(direction > 0 && *y < term.row-1) {
 775                         for(; *y < term.row; *y += direction) {
 776                                 if(!(term.line[*y][term.col-1].mode
 777                                                 & ATTR_WRAP)) {
 778                                         break;
 779                                 }
 780                         }
 781                 }
 782                 break;
 783         }
 784 }
 785
 786 void
 787 getbuttoninfo(XEvent *e) {
 788         int type;
 789         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 790
 791         sel.alt = IS_SET(MODE_ALTSCREEN);
 792
 793         sel.oe.x = x2col(e->xbutton.x);
 794         sel.oe.y = y2row(e->xbutton.y);
 795         selnormalize();
 796
 797         sel.type = SEL_REGULAR;
 798         for(type = 1; type < LEN(selmasks); ++type) {
 799                 if(match(selmasks[type], state)) {
 800                         sel.type = type;
 801                         break;
 802                 }
 803         }
 804 }
 805
 806 void
 807 mousereport(XEvent *e) {
 808         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 809             button = e->xbutton.button, state = e->xbutton.state,
 810             len;
 811         char buf[40];
 812         static int ox, oy;
 813
 814         /* from urxvt */
 815         if(e->xbutton.type == MotionNotify) {
 816                 if(x == ox && y == oy)
 817                         return;
 818                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 819                         return;
 820                 /* MOUSE_MOTION: no reporting if no button is pressed */
 821                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 822                         return;
 823
 824                 button = oldbutton + 32;
 825                 ox = x;
 826                 oy = y;
 827         } else {
 828                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 829                         button = 3;
 830                 } else {
 831                         button -= Button1;
 832                         if(button >= 3)
 833                                 button += 64 - 3;
 834                 }
 835                 if(e->xbutton.type == ButtonPress) {
 836                         oldbutton = button;
 837                         ox = x;
 838                         oy = y;
 839                 } else if(e->xbutton.type == ButtonRelease) {
 840                         oldbutton = 3;
 841                         /* MODE_MOUSEX10: no button release reporting */
 842                         if(IS_SET(MODE_MOUSEX10))
 843                                 return;
 844                         if (button == 64 || button == 65)
 845                                 return;
 846                 }
 847         }
 848
 849         if(!IS_SET(MODE_MOUSEX10)) {
 850                 button += (state & ShiftMask   ? 4  : 0)
 851                         + (state & Mod4Mask    ? 8  : 0)
 852                         + (state & ControlMask ? 16 : 0);
 853         }
 854
 855         len = 0;
 856         if(IS_SET(MODE_MOUSESGR)) {
 857                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 858                                 button, x+1, y+1,
 859                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 860         } else if(x < 223 && y < 223) {
 861                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 862                                 32+button, 32+x+1, 32+y+1);
 863         } else {
 864                 return;
 865         }
 866
 867         ttywrite(buf, len);
 868 }
 869
 870 void
 871 bpress(XEvent *e) {
 872         struct timespec now;
 873         Mousekey *mk;
 874
 875         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 876                 mousereport(e);
 877                 return;
 878         }
 879
 880         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 881                 if(e->xbutton.button == mk->b
 882                                 && match(mk->mask, e->xbutton.state)) {
 883                         ttysend(mk->s, strlen(mk->s));
 884                         return;
 885                 }
 886         }
 887
 888         if(e->xbutton.button == Button1) {
 889                 clock_gettime(CLOCK_MONOTONIC, &now);
 890
 891                 /* Clear previous selection, logically and visually. */
 892                 selclear(NULL);
 893                 sel.mode = 1;
 894                 sel.type = SEL_REGULAR;
 895                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 896                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 897
 898                 /*
 899                  * If the user clicks below predefined timeouts specific
 900                  * snapping behaviour is exposed.
 901                  */
 902                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 903                         sel.snap = SNAP_LINE;
 904                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 905                         sel.snap = SNAP_WORD;
 906                 } else {
 907                         sel.snap = 0;
 908                 }
 909                 selnormalize();
 910
 911                 /*
 912                  * Draw selection, unless it's regular and we don't want to
 913                  * make clicks visible
 914                  */
 915                 if(sel.snap != 0) {
 916                         sel.mode++;
 917                         tsetdirt(sel.nb.y, sel.ne.y);
 918                 }
 919                 sel.tclick2 = sel.tclick1;
 920                 sel.tclick1 = now;
 921         }
 922 }
 923
 924 char *
 925 getsel(void) {
 926         char *str, *ptr;
 927         int y, bufsize, size, lastx, linelen;
 928         Glyph *gp, *last;
 929
 930         if(sel.ob.x == -1)
 931                 return NULL;
 932
 933         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 934         ptr = str = xmalloc(bufsize);
 935
 936         /* append every set & selected glyph to the selection */
 937         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 938                 linelen = tlinelen(y);
 939
 940                 if(sel.type == SEL_RECTANGULAR) {
 941                         gp = &term.line[y][sel.nb.x];
 942                         lastx = sel.ne.x;
 943                 } else {
 944                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 945                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 946                 }
 947                 last = &term.line[y][MIN(lastx, linelen-1)];
 948                 while(last >= gp && last->c[0] == ' ')
 949                         --last;
 950
 951                 for( ; gp <= last; ++gp) {
 952                         if(gp->mode & ATTR_WDUMMY)
 953                                 continue;
 954
 955                         size = utf8len(gp->c);
 956                         memcpy(ptr, gp->c, size);
 957                         ptr += size;
 958                 }
 959
 960                 /*
 961                  * Copy and pasting of line endings is inconsistent
 962                  * in the inconsistent terminal and GUI world.
 963                  * The best solution seems like to produce '\n' when
 964                  * something is copied from st and convert '\n' to
 965                  * '\r', when something to be pasted is received by
 966                  * st.
 967                  * FIXME: Fix the computer world.
 968                  */
 969                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 970                         *ptr++ = '\n';
 971         }
 972         *ptr = 0;
 973         return str;
 974 }
 975
 976 void
 977 selcopy(void) {
 978         xsetsel(getsel());
 979 }
 980
 981 void
 982 selnotify(XEvent *e) {
 983         ulong nitems, ofs, rem;
 984         int format;
 985         uchar *data, *last, *repl;
 986         Atom type;
 987
 988         ofs = 0;
 989         do {
 990                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 991                                         False, AnyPropertyType, &type, &format,
 992                                         &nitems, &rem, &data)) {
 993                         fprintf(stderr, "Clipboard allocation failed\n");
 994                         return;
 995                 }
 996
 997                 /*
 998                  * As seen in getsel:
 999                  * Line endings are inconsistent in the terminal and GUI world
1000                  * copy and pasting. When receiving some selection data,
1001                  * replace all '\n' with '\r'.
1002                  * FIXME: Fix the computer world.
1003                  */
1004                 repl = data;
1005                 last = data + nitems * format / 8;
1006                 while((repl = memchr(repl, '\n', last - repl))) {
1007                         *repl++ = '\r';
1008                 }
1009
1010                 if(IS_SET(MODE_BRCKTPASTE))
1011                         ttywrite("\033[200~", 6);
1012                 ttysend((char *)data, nitems * format / 8);
1013                 if(IS_SET(MODE_BRCKTPASTE))
1014                         ttywrite("\033[201~", 6);
1015                 XFree(data);
1016                 /* number of 32-bit chunks returned */
1017                 ofs += nitems * format / 32;
1018         } while(rem > 0);
1019 }
1020
1021 void
1022 selpaste(const Arg *dummy) {
1023         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1024                         xw.win, CurrentTime);
1025 }
1026
1027 void
1028 clippaste(const Arg *dummy) {
1029         Atom clipboard;
1030
1031         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1032         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1033                         xw.win, CurrentTime);
1034 }
1035
1036 void
1037 selclear(XEvent *e) {
1038         if(sel.ob.x == -1)
1039                 return;
1040         sel.ob.x = -1;
1041         tsetdirt(sel.nb.y, sel.ne.y);
1042 }
1043
1044 void
1045 selrequest(XEvent *e) {
1046         XSelectionRequestEvent *xsre;
1047         XSelectionEvent xev;
1048         Atom xa_targets, string;
1049
1050         xsre = (XSelectionRequestEvent *) e;
1051         xev.type = SelectionNotify;
1052         xev.requestor = xsre->requestor;
1053         xev.selection = xsre->selection;
1054         xev.target = xsre->target;
1055         xev.time = xsre->time;
1056         /* reject */
1057         xev.property = None;
1058
1059         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1060         if(xsre->target == xa_targets) {
1061                 /* respond with the supported type */
1062                 string = sel.xtarget;
1063                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1064                                 XA_ATOM, 32, PropModeReplace,
1065                                 (uchar *) &string, 1);
1066                 xev.property = xsre->property;
1067         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1068                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1069                                 xsre->target, 8, PropModeReplace,
1070                                 (uchar *) sel.clip, strlen(sel.clip));
1071                 xev.property = xsre->property;
1072         }
1073
1074         /* all done, send a notification to the listener */
1075         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1076                 fprintf(stderr, "Error sending SelectionNotify event\n");
1077 }
1078
1079 void
1080 xsetsel(char *str) {
1081         /* register the selection for both the clipboard and the primary */
1082         Atom clipboard;
1083
1084         free(sel.clip);
1085         sel.clip = str;
1086
1087         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1088
1089         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1090         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1091 }
1092
1093 void
1094 brelease(XEvent *e) {
1095         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1096                 mousereport(e);
1097                 return;
1098         }
1099
1100         if(e->xbutton.button == Button2) {
1101                 selpaste(NULL);
1102         } else if(e->xbutton.button == Button1) {
1103                 if(sel.mode < 2) {
1104                         selclear(NULL);
1105                 } else {
1106                         getbuttoninfo(e);
1107                         selcopy();
1108                 }
1109                 sel.mode = 0;
1110                 tsetdirt(sel.nb.y, sel.ne.y);
1111         }
1112 }
1113
1114 void
1115 bmotion(XEvent *e) {
1116         int oldey, oldex, oldsby, oldsey;
1117
1118         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1119                 mousereport(e);
1120                 return;
1121         }
1122
1123         if(!sel.mode)
1124                 return;
1125
1126         sel.mode++;
1127         oldey = sel.oe.y;
1128         oldex = sel.oe.x;
1129         oldsby = sel.nb.y;
1130         oldsey = sel.ne.y;
1131         getbuttoninfo(e);
1132
1133         if(oldey != sel.oe.y || oldex != sel.oe.x)
1134                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1135 }
1136
1137 void
1138 die(const char *errstr, ...) {
1139         va_list ap;
1140
1141         va_start(ap, errstr);
1142         vfprintf(stderr, errstr, ap);
1143         va_end(ap);
1144         exit(EXIT_FAILURE);
1145 }
1146
1147 void
1148 execsh(void) {
1149         char **args, *sh, *prog;
1150         const struct passwd *pw;
1151         char buf[sizeof(long) * 8 + 1];
1152
1153         errno = 0;
1154         if((pw = getpwuid(getuid())) == NULL) {
1155                 if(errno)
1156                         die("getpwuid:%s\n", strerror(errno));
1157                 else
1158                         die("who are you?\n");
1159         }
1160
1161         if (!(sh = getenv("SHELL"))) {
1162                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1163         }
1164
1165         if(opt_cmd)
1166                 prog = opt_cmd[0];
1167         else if(utmp)
1168                 prog = utmp;
1169         else
1170                 prog = sh;
1171         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1172
1173         snprintf(buf, sizeof(buf), "%lu", xw.win);
1174
1175         unsetenv("COLUMNS");
1176         unsetenv("LINES");
1177         unsetenv("TERMCAP");
1178         setenv("LOGNAME", pw->pw_name, 1);
1179         setenv("USER", pw->pw_name, 1);
1180         setenv("SHELL", sh, 1);
1181         setenv("HOME", pw->pw_dir, 1);
1182         setenv("TERM", termname, 1);
1183         setenv("WINDOWID", buf, 1);
1184
1185         signal(SIGCHLD, SIG_DFL);
1186         signal(SIGHUP, SIG_DFL);
1187         signal(SIGINT, SIG_DFL);
1188         signal(SIGQUIT, SIG_DFL);
1189         signal(SIGTERM, SIG_DFL);
1190         signal(SIGALRM, SIG_DFL);
1191
1192         execvp(prog, args);
1193         _exit(EXIT_FAILURE);
1194 }
1195
1196 void
1197 sigchld(int a) {
1198         int stat, ret;
1199
1200         if(waitpid(pid, &stat, 0) < 0)
1201                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1202
1203         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1204         if (ret != EXIT_SUCCESS)
1205                 die("child finished with error '%d'\n", stat);
1206         exit(EXIT_SUCCESS);
1207 }
1208
1209 void
1210 ttynew(void) {
1211         int m, s;
1212         struct winsize w = {term.row, term.col, 0, 0};
1213
1214         /* seems to work fine on linux, openbsd and freebsd */
1215         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1216                 die("openpty failed: %s\n", strerror(errno));
1217
1218         switch(pid = fork()) {
1219         case -1:
1220                 die("fork failed\n");
1221                 break;
1222         case 0:
1223                 setsid(); /* create a new process group */
1224                 dup2(s, STDIN_FILENO);
1225                 dup2(s, STDOUT_FILENO);
1226                 dup2(s, STDERR_FILENO);
1227                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1228                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1229                 close(s);
1230                 close(m);
1231                 execsh();
1232                 break;
1233         default:
1234                 close(s);
1235                 cmdfd = m;
1236                 signal(SIGCHLD, sigchld);
1237                 if(opt_io) {
1238                         term.mode |= MODE_PRINT;
1239                         iofd = (!strcmp(opt_io, "-")) ?
1240                                   STDOUT_FILENO :
1241                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1242                         if(iofd < 0) {
1243                                 fprintf(stderr, "Error opening %s:%s\n",
1244                                         opt_io, strerror(errno));
1245                         }
1246                 }
1247                 break;
1248         }
1249 }
1250
1251 void
1252 ttyread(void) {
1253         static char buf[BUFSIZ];
1254         static int buflen = 0;
1255         char *ptr;
1256         char s[UTF_SIZ];
1257         int charsize; /* size of utf8 char in bytes */
1258         long unicodep;
1259         int ret;
1260
1261         /* append read bytes to unprocessed bytes */
1262         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1263                 die("Couldn't read from shell: %s\n", strerror(errno));
1264
1265         /* process every complete utf8 char */
1266         buflen += ret;
1267         ptr = buf;
1268         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1269                 utf8encode(unicodep, s, UTF_SIZ);
1270                 tputc(s, charsize);
1271                 ptr += charsize;
1272                 buflen -= charsize;
1273         }
1274
1275         /* keep any uncomplete utf8 char for the next call */
1276         memmove(buf, ptr, buflen);
1277 }
1278
1279 void
1280 ttywrite(const char *s, size_t n) {
1281         if(xwrite(cmdfd, s, n) == -1)
1282                 die("write error on tty: %s\n", strerror(errno));
1283 }
1284
1285 void
1286 ttysend(char *s, size_t n) {
1287         ttywrite(s, n);
1288         if(IS_SET(MODE_ECHO))
1289                 techo(s, n);
1290 }
1291
1292 void
1293 ttyresize(void) {
1294         struct winsize w;
1295
1296         w.ws_row = term.row;
1297         w.ws_col = term.col;
1298         w.ws_xpixel = xw.tw;
1299         w.ws_ypixel = xw.th;
1300         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1301                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1302 }
1303
1304 int
1305 tattrset(int attr) {
1306         int i, j;
1307
1308         for(i = 0; i < term.row-1; i++) {
1309                 for(j = 0; j < term.col-1; j++) {
1310                         if(term.line[i][j].mode & attr)
1311                                 return 1;
1312                 }
1313         }
1314
1315         return 0;
1316 }
1317
1318 void
1319 tsetdirt(int top, int bot) {
1320         int i;
1321
1322         LIMIT(top, 0, term.row-1);
1323         LIMIT(bot, 0, term.row-1);
1324
1325         for(i = top; i <= bot; i++)
1326                 term.dirty[i] = 1;
1327 }
1328
1329 void
1330 tsetdirtattr(int attr) {
1331         int i, j;
1332
1333         for(i = 0; i < term.row-1; i++) {
1334                 for(j = 0; j < term.col-1; j++) {
1335                         if(term.line[i][j].mode & attr) {
1336                                 tsetdirt(i, i);
1337                                 break;
1338                         }
1339                 }
1340         }
1341 }
1342
1343 void
1344 tfulldirt(void) {
1345         tsetdirt(0, term.row-1);
1346 }
1347
1348 void
1349 tcursor(int mode) {
1350         static TCursor c[2];
1351         bool alt = IS_SET(MODE_ALTSCREEN);
1352
1353         if(mode == CURSOR_SAVE) {
1354                 c[alt] = term.c;
1355         } else if(mode == CURSOR_LOAD) {
1356                 term.c = c[alt];
1357                 tmoveto(c[alt].x, c[alt].y);
1358         }
1359 }
1360
1361 void
1362 treset(void) {
1363         uint i;
1364
1365         term.c = (TCursor){{
1366                 .mode = ATTR_NULL,
1367                 .fg = defaultfg,
1368                 .bg = defaultbg
1369         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1370
1371         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1372         for(i = tabspaces; i < term.col; i += tabspaces)
1373                 term.tabs[i] = 1;
1374         term.top = 0;
1375         term.bot = term.row - 1;
1376         term.mode = MODE_WRAP;
1377         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1378         term.charset = 0;
1379
1380         for(i = 0; i < 2; i++) {
1381                 tmoveto(0, 0);
1382                 tcursor(CURSOR_SAVE);
1383                 tclearregion(0, 0, term.col-1, term.row-1);
1384                 tswapscreen();
1385         }
1386 }
1387
1388 void
1389 tnew(int col, int row) {
1390         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1391         tresize(col, row);
1392         term.numlock = 1;
1393
1394         treset();
1395 }
1396
1397 void
1398 tswapscreen(void) {
1399         Line *tmp = term.line;
1400
1401         term.line = term.alt;
1402         term.alt = tmp;
1403         term.mode ^= MODE_ALTSCREEN;
1404         tfulldirt();
1405 }
1406
1407 void
1408 tscrolldown(int orig, int n) {
1409         int i;
1410         Line temp;
1411
1412         LIMIT(n, 0, term.bot-orig+1);
1413
1414         tsetdirt(orig, term.bot-n);
1415         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1416
1417         for(i = term.bot; i >= orig+n; i--) {
1418                 temp = term.line[i];
1419                 term.line[i] = term.line[i-n];
1420                 term.line[i-n] = temp;
1421         }
1422
1423         selscroll(orig, n);
1424 }
1425
1426 void
1427 tscrollup(int orig, int n) {
1428         int i;
1429         Line temp;
1430
1431         LIMIT(n, 0, term.bot-orig+1);
1432
1433         tclearregion(0, orig, term.col-1, orig+n-1);
1434         tsetdirt(orig+n, term.bot);
1435
1436         for(i = orig; i <= term.bot-n; i++) {
1437                 temp = term.line[i];
1438                 term.line[i] = term.line[i+n];
1439                 term.line[i+n] = temp;
1440         }
1441
1442         selscroll(orig, -n);
1443 }
1444
1445 void
1446 selscroll(int orig, int n) {
1447         if(sel.ob.x == -1)
1448                 return;
1449
1450         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1451                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1452                         selclear(NULL);
1453                         return;
1454                 }
1455                 if(sel.type == SEL_RECTANGULAR) {
1456                         if(sel.ob.y < term.top)
1457                                 sel.ob.y = term.top;
1458                         if(sel.oe.y > term.bot)
1459                                 sel.oe.y = term.bot;
1460                 } else {
1461                         if(sel.ob.y < term.top) {
1462                                 sel.ob.y = term.top;
1463                                 sel.ob.x = 0;
1464                         }
1465                         if(sel.oe.y > term.bot) {
1466                                 sel.oe.y = term.bot;
1467                                 sel.oe.x = term.col;
1468                         }
1469                 }
1470                 selnormalize();
1471         }
1472 }
1473
1474 void
1475 tnewline(int first_col) {
1476         int y = term.c.y;
1477
1478         if(y == term.bot) {
1479                 tscrollup(term.top, 1);
1480         } else {
1481                 y++;
1482         }
1483         tmoveto(first_col ? 0 : term.c.x, y);
1484 }
1485
1486 void
1487 csiparse(void) {
1488         char *p = csiescseq.buf, *np;
1489         long int v;
1490
1491         csiescseq.narg = 0;
1492         if(*p == '?') {
1493                 csiescseq.priv = 1;
1494                 p++;
1495         }
1496
1497         csiescseq.buf[csiescseq.len] = '\0';
1498         while(p < csiescseq.buf+csiescseq.len) {
1499                 np = NULL;
1500                 v = strtol(p, &np, 10);
1501                 if(np == p)
1502                         v = 0;
1503                 if(v == LONG_MAX || v == LONG_MIN)
1504                         v = -1;
1505                 csiescseq.arg[csiescseq.narg++] = v;
1506                 p = np;
1507                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1508                         break;
1509                 p++;
1510         }
1511         csiescseq.mode = *p;
1512 }
1513
1514 /* for absolute user moves, when decom is set */
1515 void
1516 tmoveato(int x, int y) {
1517         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1518 }
1519
1520 void
1521 tmoveto(int x, int y) {
1522         int miny, maxy;
1523
1524         if(term.c.state & CURSOR_ORIGIN) {
1525                 miny = term.top;
1526                 maxy = term.bot;
1527         } else {
1528                 miny = 0;
1529                 maxy = term.row - 1;
1530         }
1531         LIMIT(x, 0, term.col-1);
1532         LIMIT(y, miny, maxy);
1533         term.c.state &= ~CURSOR_WRAPNEXT;
1534         term.c.x = x;
1535         term.c.y = y;
1536 }
1537
1538 void
1539 tsetchar(char *c, Glyph *attr, int x, int y) {
1540         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1541                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1542                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1543                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1544                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1545                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1546                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1547                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1548                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1549         };
1550
1551         /*
1552          * The table is proudly stolen from rxvt.
1553          */
1554         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1555                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1556                         c = vt100_0[c[0] - 0x41];
1557                 }
1558         }
1559
1560         if(term.line[y][x].mode & ATTR_WIDE) {
1561                 if(x+1 < term.col) {
1562                         term.line[y][x+1].c[0] = ' ';
1563                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1564                 }
1565         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1566                 term.line[y][x-1].c[0] = ' ';
1567                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1568         }
1569
1570         term.dirty[y] = 1;
1571         term.line[y][x] = *attr;
1572         memcpy(term.line[y][x].c, c, UTF_SIZ);
1573 }
1574
1575 void
1576 tclearregion(int x1, int y1, int x2, int y2) {
1577         int x, y, temp;
1578         Glyph *gp;
1579
1580         if(x1 > x2)
1581                 temp = x1, x1 = x2, x2 = temp;
1582         if(y1 > y2)
1583                 temp = y1, y1 = y2, y2 = temp;
1584
1585         LIMIT(x1, 0, term.col-1);
1586         LIMIT(x2, 0, term.col-1);
1587         LIMIT(y1, 0, term.row-1);
1588         LIMIT(y2, 0, term.row-1);
1589
1590         for(y = y1; y <= y2; y++) {
1591                 term.dirty[y] = 1;
1592                 for(x = x1; x <= x2; x++) {
1593                         gp = &term.line[y][x];
1594                         if(selected(x, y))
1595                                 selclear(NULL);
1596                         gp->fg = term.c.attr.fg;
1597                         gp->bg = term.c.attr.bg;
1598                         gp->mode = 0;
1599                         memcpy(gp->c, " ", 2);
1600                 }
1601         }
1602 }
1603
1604 void
1605 tdeletechar(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;
1612         src = term.c.x + n;
1613         size = term.col - src;
1614         line = term.line[term.c.y];
1615
1616         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1617         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1618 }
1619
1620 void
1621 tinsertblank(int n) {
1622         int dst, src, size;
1623         Glyph *line;
1624
1625         LIMIT(n, 0, term.col - term.c.x);
1626
1627         dst = term.c.x + n;
1628         src = term.c.x;
1629         size = term.col - dst;
1630         line = term.line[term.c.y];
1631
1632         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1633         tclearregion(src, term.c.y, dst - 1, term.c.y);
1634 }
1635
1636 void
1637 tinsertblankline(int n) {
1638         if(BETWEEN(term.c.y, term.top, term.bot))
1639                 tscrolldown(term.c.y, n);
1640 }
1641
1642 void
1643 tdeleteline(int n) {
1644         if(BETWEEN(term.c.y, term.top, term.bot))
1645                 tscrollup(term.c.y, n);
1646 }
1647
1648 int32_t
1649 tdefcolor(int *attr, int *npar, int l) {
1650         int32_t idx = -1;
1651         uint r, g, b;
1652
1653         switch (attr[*npar + 1]) {
1654         case 2: /* direct color in RGB space */
1655                 if (*npar + 4 >= l) {
1656                         fprintf(stderr,
1657                                 "erresc(38): Incorrect number of parameters (%d)\n",
1658                                 *npar);
1659                         break;
1660                 }
1661                 r = attr[*npar + 2];
1662                 g = attr[*npar + 3];
1663                 b = attr[*npar + 4];
1664                 *npar += 4;
1665                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1666                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1667                                 r, g, b);
1668                 else
1669                         idx = TRUECOLOR(r, g, b);
1670                 break;
1671         case 5: /* indexed color */
1672                 if (*npar + 2 >= l) {
1673                         fprintf(stderr,
1674                                 "erresc(38): Incorrect number of parameters (%d)\n",
1675                                 *npar);
1676                         break;
1677                 }
1678                 *npar += 2;
1679                 if(!BETWEEN(attr[*npar], 0, 255))
1680                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1681                 else
1682                         idx = attr[*npar];
1683                 break;
1684         case 0: /* implemented defined (only foreground) */
1685         case 1: /* transparent */
1686         case 3: /* direct color in CMY space */
1687         case 4: /* direct color in CMYK space */
1688         default:
1689                 fprintf(stderr,
1690                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1691                 break;
1692         }
1693
1694         return idx;
1695 }
1696
1697 void
1698 tsetattr(int *attr, int l) {
1699         int i;
1700         int32_t idx;
1701
1702         for(i = 0; i < l; i++) {
1703                 switch(attr[i]) {
1704                 case 0:
1705                         term.c.attr.mode &= ~(
1706                                 ATTR_BOLD       |
1707                                 ATTR_FAINT      |
1708                                 ATTR_ITALIC     |
1709                                 ATTR_UNDERLINE  |
1710                                 ATTR_BLINK      |
1711                                 ATTR_REVERSE    |
1712                                 ATTR_INVISIBLE  |
1713                                 ATTR_STRUCK     );
1714                         term.c.attr.fg = defaultfg;
1715                         term.c.attr.bg = defaultbg;
1716                         break;
1717                 case 1:
1718                         term.c.attr.mode |= ATTR_BOLD;
1719                         break;
1720                 case 2:
1721                         term.c.attr.mode |= ATTR_FAINT;
1722                         break;
1723                 case 3:
1724                         term.c.attr.mode |= ATTR_ITALIC;
1725                         break;
1726                 case 4:
1727                         term.c.attr.mode |= ATTR_UNDERLINE;
1728                         break;
1729                 case 5: /* slow blink */
1730                         /* FALLTHROUGH */
1731                 case 6: /* rapid blink */
1732                         term.c.attr.mode |= ATTR_BLINK;
1733                         break;
1734                 case 7:
1735                         term.c.attr.mode |= ATTR_REVERSE;
1736                         break;
1737                 case 8:
1738                         term.c.attr.mode |= ATTR_INVISIBLE;
1739                         break;
1740                 case 9:
1741                         term.c.attr.mode |= ATTR_STRUCK;
1742                         break;
1743                 case 22:
1744                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1745                         break;
1746                 case 23:
1747                         term.c.attr.mode &= ~ATTR_ITALIC;
1748                         break;
1749                 case 24:
1750                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1751                         break;
1752                 case 25:
1753                         term.c.attr.mode &= ~ATTR_BLINK;
1754                         break;
1755                 case 27:
1756                         term.c.attr.mode &= ~ATTR_REVERSE;
1757                         break;
1758                 case 28:
1759                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1760                         break;
1761                 case 29:
1762                         term.c.attr.mode &= ~ATTR_STRUCK;
1763                         break;
1764                 case 38:
1765                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1766                                 term.c.attr.fg = idx;
1767                         break;
1768                 case 39:
1769                         term.c.attr.fg = defaultfg;
1770                         break;
1771                 case 48:
1772                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1773                                 term.c.attr.bg = idx;
1774                         break;
1775                 case 49:
1776                         term.c.attr.bg = defaultbg;
1777                         break;
1778                 default:
1779                         if(BETWEEN(attr[i], 30, 37)) {
1780                                 term.c.attr.fg = attr[i] - 30;
1781                         } else if(BETWEEN(attr[i], 40, 47)) {
1782                                 term.c.attr.bg = attr[i] - 40;
1783                         } else if(BETWEEN(attr[i], 90, 97)) {
1784                                 term.c.attr.fg = attr[i] - 90 + 8;
1785                         } else if(BETWEEN(attr[i], 100, 107)) {
1786                                 term.c.attr.bg = attr[i] - 100 + 8;
1787                         } else {
1788                                 fprintf(stderr,
1789                                         "erresc(default): gfx attr %d unknown\n",
1790                                         attr[i]), csidump();
1791                         }
1792                         break;
1793                 }
1794         }
1795 }
1796
1797 void
1798 tsetscroll(int t, int b) {
1799         int temp;
1800
1801         LIMIT(t, 0, term.row-1);
1802         LIMIT(b, 0, term.row-1);
1803         if(t > b) {
1804                 temp = t;
1805                 t = b;
1806                 b = temp;
1807         }
1808         term.top = t;
1809         term.bot = b;
1810 }
1811
1812 void
1813 tsetmode(bool priv, bool set, int *args, int narg) {
1814         int *lim, mode;
1815         bool alt;
1816
1817         for(lim = args + narg; args < lim; ++args) {
1818                 if(priv) {
1819                         switch(*args) {
1820                         case 1: /* DECCKM -- Cursor key */
1821                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1822                                 break;
1823                         case 5: /* DECSCNM -- Reverse video */
1824                                 mode = term.mode;
1825                                 MODBIT(term.mode, set, MODE_REVERSE);
1826                                 if(mode != term.mode)
1827                                         redraw();
1828                                 break;
1829                         case 6: /* DECOM -- Origin */
1830                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1831                                 tmoveato(0, 0);
1832                                 break;
1833                         case 7: /* DECAWM -- Auto wrap */
1834                                 MODBIT(term.mode, set, MODE_WRAP);
1835                                 break;
1836                         case 0:  /* Error (IGNORED) */
1837                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1838                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1839                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1840                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1841                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1842                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1843                         case 42: /* DECNRCM -- National characters (IGNORED) */
1844                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1845                                 break;
1846                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1847                                 MODBIT(term.mode, !set, MODE_HIDE);
1848                                 break;
1849                         case 9:    /* X10 mouse compatibility mode */
1850                                 xsetpointermotion(0);
1851                                 MODBIT(term.mode, 0, MODE_MOUSE);
1852                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1853                                 break;
1854                         case 1000: /* 1000: report button press */
1855                                 xsetpointermotion(0);
1856                                 MODBIT(term.mode, 0, MODE_MOUSE);
1857                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1858                                 break;
1859                         case 1002: /* 1002: report motion on button press */
1860                                 xsetpointermotion(0);
1861                                 MODBIT(term.mode, 0, MODE_MOUSE);
1862                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1863                                 break;
1864                         case 1003: /* 1003: enable all mouse motions */
1865                                 xsetpointermotion(set);
1866                                 MODBIT(term.mode, 0, MODE_MOUSE);
1867                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1868                                 break;
1869                         case 1004: /* 1004: send focus events to tty */
1870                                 MODBIT(term.mode, set, MODE_FOCUS);
1871                                 break;
1872                         case 1006: /* 1006: extended reporting mode */
1873                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1874                                 break;
1875                         case 1034:
1876                                 MODBIT(term.mode, set, MODE_8BIT);
1877                                 break;
1878                         case 1049: /* swap screen & set/restore cursor as xterm */
1879                                 if (!allowaltscreen)
1880                                         break;
1881                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1882                                 /* FALLTHROUGH */
1883                         case 47: /* swap screen */
1884                         case 1047:
1885                                 if (!allowaltscreen)
1886                                         break;
1887                                 alt = IS_SET(MODE_ALTSCREEN);
1888                                 if(alt) {
1889                                         tclearregion(0, 0, term.col-1,
1890                                                         term.row-1);
1891                                 }
1892                                 if(set ^ alt) /* set is always 1 or 0 */
1893                                         tswapscreen();
1894                                 if(*args != 1049)
1895                                         break;
1896                                 /* FALLTHROUGH */
1897                         case 1048:
1898                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1899                                 break;
1900                         case 2004: /* 2004: bracketed paste mode */
1901                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1902                                 break;
1903                         /* Not implemented mouse modes. See comments there. */
1904                         case 1001: /* mouse highlight mode; can hang the
1905                                       terminal by design when implemented. */
1906                         case 1005: /* UTF-8 mouse mode; will confuse
1907                                       applications not supporting UTF-8
1908                                       and luit. */
1909                         case 1015: /* urxvt mangled mouse mode; incompatible
1910                                       and can be mistaken for other control
1911                                       codes. */
1912                         default:
1913                                 fprintf(stderr,
1914                                         "erresc: unknown private set/reset mode %d\n",
1915                                         *args);
1916                                 break;
1917                         }
1918                 } else {
1919                         switch(*args) {
1920                         case 0:  /* Error (IGNORED) */
1921                                 break;
1922                         case 2:  /* KAM -- keyboard action */
1923                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1924                                 break;
1925                         case 4:  /* IRM -- Insertion-replacement */
1926                                 MODBIT(term.mode, set, MODE_INSERT);
1927                                 break;
1928                         case 12: /* SRM -- Send/Receive */
1929                                 MODBIT(term.mode, !set, MODE_ECHO);
1930                                 break;
1931                         case 20: /* LNM -- Linefeed/new line */
1932                                 MODBIT(term.mode, set, MODE_CRLF);
1933                                 break;
1934                         default:
1935                                 fprintf(stderr,
1936                                         "erresc: unknown set/reset mode %d\n",
1937                                         *args);
1938                                 break;
1939                         }
1940                 }
1941         }
1942 }
1943
1944 void
1945 csihandle(void) {
1946         char buf[40];
1947         int len;
1948
1949         switch(csiescseq.mode) {
1950         default:
1951         unknown:
1952                 fprintf(stderr, "erresc: unknown csi ");
1953                 csidump();
1954                 /* die(""); */
1955                 break;
1956         case '@': /* ICH -- Insert <n> blank char */
1957                 DEFAULT(csiescseq.arg[0], 1);
1958                 tinsertblank(csiescseq.arg[0]);
1959                 break;
1960         case 'A': /* CUU -- Cursor <n> Up */
1961                 DEFAULT(csiescseq.arg[0], 1);
1962                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1963                 break;
1964         case 'B': /* CUD -- Cursor <n> Down */
1965         case 'e': /* VPR --Cursor <n> Down */
1966                 DEFAULT(csiescseq.arg[0], 1);
1967                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1968                 break;
1969         case 'i': /* MC -- Media Copy */
1970                 switch(csiescseq.arg[0]) {
1971                 case 0:
1972                         tdump();
1973                         break;
1974                 case 1:
1975                         tdumpline(term.c.y);
1976                         break;
1977                 case 2:
1978                         tdumpsel();
1979                         break;
1980                 case 4:
1981                         term.mode &= ~MODE_PRINT;
1982                         break;
1983                 case 5:
1984                         term.mode |= MODE_PRINT;
1985                         break;
1986                 }
1987                 break;
1988         case 'c': /* DA -- Device Attributes */
1989                 if(csiescseq.arg[0] == 0)
1990                         ttywrite(vtiden, sizeof(vtiden) - 1);
1991                 break;
1992         case 'C': /* CUF -- Cursor <n> Forward */
1993         case 'a': /* HPR -- Cursor <n> Forward */
1994                 DEFAULT(csiescseq.arg[0], 1);
1995                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1996                 break;
1997         case 'D': /* CUB -- Cursor <n> Backward */
1998                 DEFAULT(csiescseq.arg[0], 1);
1999                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2000                 break;
2001         case 'E': /* CNL -- Cursor <n> Down and first col */
2002                 DEFAULT(csiescseq.arg[0], 1);
2003                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2004                 break;
2005         case 'F': /* CPL -- Cursor <n> Up and first col */
2006                 DEFAULT(csiescseq.arg[0], 1);
2007                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2008                 break;
2009         case 'g': /* TBC -- Tabulation clear */
2010                 switch(csiescseq.arg[0]) {
2011                 case 0: /* clear current tab stop */
2012                         term.tabs[term.c.x] = 0;
2013                         break;
2014                 case 3: /* clear all the tabs */
2015                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2016                         break;
2017                 default:
2018                         goto unknown;
2019                 }
2020                 break;
2021         case 'G': /* CHA -- Move to <col> */
2022         case '`': /* HPA */
2023                 DEFAULT(csiescseq.arg[0], 1);
2024                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2025                 break;
2026         case 'H': /* CUP -- Move to <row> <col> */
2027         case 'f': /* HVP */
2028                 DEFAULT(csiescseq.arg[0], 1);
2029                 DEFAULT(csiescseq.arg[1], 1);
2030                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2031                 break;
2032         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2033                 DEFAULT(csiescseq.arg[0], 1);
2034                 tputtab(csiescseq.arg[0]);
2035                 break;
2036         case 'J': /* ED -- Clear screen */
2037                 selclear(NULL);
2038                 switch(csiescseq.arg[0]) {
2039                 case 0: /* below */
2040                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2041                         if(term.c.y < term.row-1) {
2042                                 tclearregion(0, term.c.y+1, term.col-1,
2043                                                 term.row-1);
2044                         }
2045                         break;
2046                 case 1: /* above */
2047                         if(term.c.y > 1)
2048                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2049                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2050                         break;
2051                 case 2: /* all */
2052                         tclearregion(0, 0, term.col-1, term.row-1);
2053                         break;
2054                 default:
2055                         goto unknown;
2056                 }
2057                 break;
2058         case 'K': /* EL -- Clear line */
2059                 switch(csiescseq.arg[0]) {
2060                 case 0: /* right */
2061                         tclearregion(term.c.x, term.c.y, term.col-1,
2062                                         term.c.y);
2063                         break;
2064                 case 1: /* left */
2065                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2066                         break;
2067                 case 2: /* all */
2068                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2069                         break;
2070                 }
2071                 break;
2072         case 'S': /* SU -- Scroll <n> line up */
2073                 DEFAULT(csiescseq.arg[0], 1);
2074                 tscrollup(term.top, csiescseq.arg[0]);
2075                 break;
2076         case 'T': /* SD -- Scroll <n> line down */
2077                 DEFAULT(csiescseq.arg[0], 1);
2078                 tscrolldown(term.top, csiescseq.arg[0]);
2079                 break;
2080         case 'L': /* IL -- Insert <n> blank lines */
2081                 DEFAULT(csiescseq.arg[0], 1);
2082                 tinsertblankline(csiescseq.arg[0]);
2083                 break;
2084         case 'l': /* RM -- Reset Mode */
2085                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2086                 break;
2087         case 'M': /* DL -- Delete <n> lines */
2088                 DEFAULT(csiescseq.arg[0], 1);
2089                 tdeleteline(csiescseq.arg[0]);
2090                 break;
2091         case 'X': /* ECH -- Erase <n> char */
2092                 DEFAULT(csiescseq.arg[0], 1);
2093                 tclearregion(term.c.x, term.c.y,
2094                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2095                 break;
2096         case 'P': /* DCH -- Delete <n> char */
2097                 DEFAULT(csiescseq.arg[0], 1);
2098                 tdeletechar(csiescseq.arg[0]);
2099                 break;
2100         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2101                 DEFAULT(csiescseq.arg[0], 1);
2102                 tputtab(-csiescseq.arg[0]);
2103                 break;
2104         case 'd': /* VPA -- Move to <row> */
2105                 DEFAULT(csiescseq.arg[0], 1);
2106                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2107                 break;
2108         case 'h': /* SM -- Set terminal mode */
2109                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2110                 break;
2111         case 'm': /* SGR -- Terminal attribute (color) */
2112                 tsetattr(csiescseq.arg, csiescseq.narg);
2113                 break;
2114         case 'n': /* DSR – Device Status Report (cursor position) */
2115                 if (csiescseq.arg[0] == 6) {
2116                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2117                                         term.c.y+1, term.c.x+1);
2118                         ttywrite(buf, len);
2119                 }
2120                 break;
2121         case 'r': /* DECSTBM -- Set Scrolling Region */
2122                 if(csiescseq.priv) {
2123                         goto unknown;
2124                 } else {
2125                         DEFAULT(csiescseq.arg[0], 1);
2126                         DEFAULT(csiescseq.arg[1], term.row);
2127                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2128                         tmoveato(0, 0);
2129                 }
2130                 break;
2131         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2132                 tcursor(CURSOR_SAVE);
2133                 break;
2134         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2135                 tcursor(CURSOR_LOAD);
2136                 break;
2137         }
2138 }
2139
2140 void
2141 csidump(void) {
2142         int i;
2143         uint c;
2144
2145         printf("ESC[");
2146         for(i = 0; i < csiescseq.len; i++) {
2147                 c = csiescseq.buf[i] & 0xff;
2148                 if(isprint(c)) {
2149                         putchar(c);
2150                 } else if(c == '\n') {
2151                         printf("(\\n)");
2152                 } else if(c == '\r') {
2153                         printf("(\\r)");
2154                 } else if(c == 0x1b) {
2155                         printf("(\\e)");
2156                 } else {
2157                         printf("(%02x)", c);
2158                 }
2159         }
2160         putchar('\n');
2161 }
2162
2163 void
2164 csireset(void) {
2165         memset(&csiescseq, 0, sizeof(csiescseq));
2166 }
2167
2168 void
2169 strhandle(void) {
2170         char *p = NULL;
2171         int j, narg, par;
2172
2173         term.esc &= ~(ESC_STR_END|ESC_STR);
2174         strparse();
2175         narg = strescseq.narg;
2176         par = atoi(strescseq.args[0]);
2177
2178         switch(strescseq.type) {
2179         case ']': /* OSC -- Operating System Command */
2180                 switch(par) {
2181                 case 0:
2182                 case 1:
2183                 case 2:
2184                         if(narg > 1)
2185                                 xsettitle(strescseq.args[1]);
2186                         return;
2187                 case 4: /* color set */
2188                         if(narg < 3)
2189                                 break;
2190                         p = strescseq.args[2];
2191                         /* FALLTHROUGH */
2192                 case 104: /* color reset, here p = NULL */
2193                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2194                         if(xsetcolorname(j, p)) {
2195                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2196                         } else {
2197                                 /*
2198                                  * TODO if defaultbg color is changed, borders
2199                                  * are dirty
2200                                  */
2201                                 redraw();
2202                         }
2203                         return;
2204                 }
2205                 break;
2206         case 'k': /* old title set compatibility */
2207                 xsettitle(strescseq.args[0]);
2208                 return;
2209         case 'P': /* DCS -- Device Control String */
2210         case '_': /* APC -- Application Program Command */
2211         case '^': /* PM -- Privacy Message */
2212                 return;
2213         }
2214
2215         fprintf(stderr, "erresc: unknown str ");
2216         strdump();
2217 }
2218
2219 void
2220 strparse(void) {
2221         char *p = strescseq.buf;
2222
2223         strescseq.narg = 0;
2224         strescseq.buf[strescseq.len] = '\0';
2225         while(p && strescseq.narg < STR_ARG_SIZ)
2226                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2227 }
2228
2229 void
2230 strdump(void) {
2231         int i;
2232         uint c;
2233
2234         printf("ESC%c", strescseq.type);
2235         for(i = 0; i < strescseq.len; i++) {
2236                 c = strescseq.buf[i] & 0xff;
2237                 if(c == '\0') {
2238                         return;
2239                 } else if(isprint(c)) {
2240                         putchar(c);
2241                 } else if(c == '\n') {
2242                         printf("(\\n)");
2243                 } else if(c == '\r') {
2244                         printf("(\\r)");
2245                 } else if(c == 0x1b) {
2246                         printf("(\\e)");
2247                 } else {
2248                         printf("(%02x)", c);
2249                 }
2250         }
2251         printf("ESC\\\n");
2252 }
2253
2254 void
2255 strreset(void) {
2256         memset(&strescseq, 0, sizeof(strescseq));
2257 }
2258
2259 void
2260 tprinter(char *s, size_t len) {
2261         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2262                 fprintf(stderr, "Error writing in %s:%s\n",
2263                         opt_io, strerror(errno));
2264                 close(iofd);
2265                 iofd = -1;
2266         }
2267 }
2268
2269 void
2270 toggleprinter(const Arg *arg) {
2271         term.mode ^= MODE_PRINT;
2272 }
2273
2274 void
2275 printscreen(const Arg *arg) {
2276         tdump();
2277 }
2278
2279 void
2280 printsel(const Arg *arg) {
2281         tdumpsel();
2282 }
2283
2284 void
2285 tdumpsel(void) {
2286         char *ptr;
2287
2288         if((ptr = getsel())) {
2289                 tprinter(ptr, strlen(ptr));
2290                 free(ptr);
2291         }
2292 }
2293
2294 void
2295 tdumpline(int n) {
2296         Glyph *bp, *end;
2297
2298         bp = &term.line[n][0];
2299         end = &bp[MIN(tlinelen(n), term.col) - 1];
2300         if(bp != end || bp->c[0] != ' ') {
2301                 for( ;bp <= end; ++bp)
2302                         tprinter(bp->c, utf8len(bp->c));
2303         }
2304         tprinter("\n", 1);
2305 }
2306
2307 void
2308 tdump(void) {
2309         int i;
2310
2311         for(i = 0; i < term.row; ++i)
2312                 tdumpline(i);
2313 }
2314
2315 void
2316 tputtab(int n) {
2317         uint x = term.c.x;
2318
2319         if(n > 0) {
2320                 while(x < term.col && n--)
2321                         for(++x; x < term.col && !term.tabs[x]; ++x)
2322                                 /* nothing */ ;
2323         } else if(n < 0) {
2324                 while(x > 0 && n++)
2325                         for(--x; x > 0 && !term.tabs[x]; --x)
2326                                 /* nothing */ ;
2327         }
2328         tmoveto(x, term.c.y);
2329 }
2330
2331 void
2332 techo(char *buf, int len) {
2333         for(; len > 0; buf++, len--) {
2334                 char c = *buf;
2335
2336                 if(ISCONTROL((uchar) c)) { /* control code */
2337                         if(c & 0x80) {
2338                                 c &= 0x7f;
2339                                 tputc("^", 1);
2340                                 tputc("[", 1);
2341                         } else if(c != '\n' && c != '\r' && c != '\t') {
2342                                 c ^= 0x40;
2343                                 tputc("^", 1);
2344                         }
2345                         tputc(&c, 1);
2346                 } else {
2347                         break;
2348                 }
2349         }
2350         if(len)
2351                 tputc(buf, len);
2352 }
2353
2354 void
2355 tdeftran(char ascii) {
2356         static char cs[] = "0B";
2357         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2358         char *p;
2359
2360         if((p = strchr(cs, ascii)) == NULL) {
2361                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2362         } else {
2363                 term.trantbl[term.icharset] = vcs[p - cs];
2364         }
2365 }
2366
2367 void
2368 tdectest(char c) {
2369         static char E[UTF_SIZ] = "E";
2370         int x, y;
2371
2372         if(c == '8') { /* DEC screen alignment test. */
2373                 for(x = 0; x < term.col; ++x) {
2374                         for(y = 0; y < term.row; ++y)
2375                                 tsetchar(E, &term.c.attr, x, y);
2376                 }
2377         }
2378 }
2379
2380 void
2381 tstrsequence(uchar c) {
2382         if (c & 0x80) {
2383                 switch (c) {
2384                 case 0x90:   /* DCS -- Device Control String */
2385                         c = 'P';
2386                         break;
2387                 case 0x9f:   /* APC -- Application Program Command */
2388                         c = '_';
2389                         break;
2390                 case 0x9e:   /* PM -- Privacy Message */
2391                         c = '^';
2392                         break;
2393                 case 0x9d:   /* OSC -- Operating System Command */
2394                         c = ']';
2395                         break;
2396                 }
2397         }
2398         strreset();
2399         strescseq.type = c;
2400         term.esc |= ESC_STR;
2401         return;
2402 }
2403
2404 void
2405 tcontrolcode(uchar ascii) {
2406         static char question[UTF_SIZ] = "?";
2407
2408         switch(ascii) {
2409         case '\t':   /* HT */
2410                 tputtab(1);
2411                 return;
2412         case '\b':   /* BS */
2413                 tmoveto(term.c.x-1, term.c.y);
2414                 return;
2415         case '\r':   /* CR */
2416                 tmoveto(0, term.c.y);
2417                 return;
2418         case '\f':   /* LF */
2419         case '\v':   /* VT */
2420         case '\n':   /* LF */
2421                 /* go to first col if the mode is set */
2422                 tnewline(IS_SET(MODE_CRLF));
2423                 return;
2424         case '\a':   /* BEL */
2425                 if(term.esc & ESC_STR_END) {
2426                         /* backwards compatibility to xterm */
2427                         strhandle();
2428                 } else {
2429                         if(!(xw.state & WIN_FOCUSED))
2430                                 xseturgency(1);
2431                         if (bellvolume)
2432                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2433                 }
2434                 break;
2435         case '\033': /* ESC */
2436                 csireset();
2437                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2438                 term.esc |= ESC_START;
2439                 return;
2440         case '\016': /* SO (LS1 -- Locking shift 1) */
2441         case '\017': /* SI (LS0 -- Locking shift 0) */
2442                 term.charset = 1 - (ascii - '\016');
2443                 return;
2444         case '\032': /* SUB */
2445                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2446         case '\030': /* CAN */
2447                 csireset();
2448                 break;
2449         case '\005': /* ENQ (IGNORED) */
2450         case '\000': /* NUL (IGNORED) */
2451         case '\021': /* XON (IGNORED) */
2452         case '\023': /* XOFF (IGNORED) */
2453         case 0177:   /* DEL (IGNORED) */
2454                 return;
2455         case 0x84:   /* TODO: IND */
2456                 break;
2457         case 0x85:   /* NEL -- Next line */
2458                 tnewline(1); /* always go to first col */
2459                 break;
2460         case 0x88:   /* HTS -- Horizontal tab stop */
2461                 term.tabs[term.c.x] = 1;
2462                 break;
2463         case 0x8d:   /* TODO: RI */
2464         case 0x8e:   /* TODO: SS2 */
2465         case 0x8f:   /* TODO: SS3 */
2466         case 0x98:   /* TODO: SOS */
2467                 break;
2468         case 0x9a:   /* DECID -- Identify Terminal */
2469                 ttywrite(vtiden, sizeof(vtiden) - 1);
2470                 break;
2471         case 0x9b:   /* TODO: CSI */
2472         case 0x9c:   /* TODO: ST */
2473                 break;
2474         case 0x90:   /* DCS -- Device Control String */
2475         case 0x9f:   /* APC -- Application Program Command */
2476         case 0x9e:   /* PM -- Privacy Message */
2477         case 0x9d:   /* OSC -- Operating System Command */
2478                 tstrsequence(ascii);
2479                 return;
2480         }
2481         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2482         term.esc &= ~(ESC_STR_END|ESC_STR);
2483         return;
2484 }
2485
2486 /*
2487  * returns 1 when the sequence is finished and it hasn't to read
2488  * more characters for this sequence, otherwise 0
2489  */
2490 int
2491 eschandle(uchar ascii) {
2492         switch(ascii) {
2493         case '[':
2494                 term.esc |= ESC_CSI;
2495                 return 0;
2496         case '#':
2497                 term.esc |= ESC_TEST;
2498                 return 0;
2499         case 'P': /* DCS -- Device Control String */
2500         case '_': /* APC -- Application Program Command */
2501         case '^': /* PM -- Privacy Message */
2502         case ']': /* OSC -- Operating System Command */
2503         case 'k': /* old title set compatibility */
2504                 tstrsequence(ascii);
2505                 return 0;
2506         case 'n': /* LS2 -- Locking shift 2 */
2507         case 'o': /* LS3 -- Locking shift 3 */
2508                 term.charset = 2 + (ascii - 'n');
2509                 break;
2510         case '(': /* GZD4 -- set primary charset G0 */
2511         case ')': /* G1D4 -- set secondary charset G1 */
2512         case '*': /* G2D4 -- set tertiary charset G2 */
2513         case '+': /* G3D4 -- set quaternary charset G3 */
2514                 term.icharset = ascii - '(';
2515                 term.esc |= ESC_ALTCHARSET;
2516                 return 0;
2517         case 'D': /* IND -- Linefeed */
2518                 if(term.c.y == term.bot) {
2519                         tscrollup(term.top, 1);
2520                 } else {
2521                         tmoveto(term.c.x, term.c.y+1);
2522                 }
2523                 break;
2524         case 'E': /* NEL -- Next line */
2525                 tnewline(1); /* always go to first col */
2526                 break;
2527         case 'H': /* HTS -- Horizontal tab stop */
2528                 term.tabs[term.c.x] = 1;
2529                 break;
2530         case 'M': /* RI -- Reverse index */
2531                 if(term.c.y == term.top) {
2532                         tscrolldown(term.top, 1);
2533                 } else {
2534                         tmoveto(term.c.x, term.c.y-1);
2535                 }
2536                 break;
2537         case 'Z': /* DECID -- Identify Terminal */
2538                 ttywrite(vtiden, sizeof(vtiden) - 1);
2539                 break;
2540         case 'c': /* RIS -- Reset to inital state */
2541                 treset();
2542                 xresettitle();
2543                 xloadcols();
2544                 break;
2545         case '=': /* DECPAM -- Application keypad */
2546                 term.mode |= MODE_APPKEYPAD;
2547                 break;
2548         case '>': /* DECPNM -- Normal keypad */
2549                 term.mode &= ~MODE_APPKEYPAD;
2550                 break;
2551         case '7': /* DECSC -- Save Cursor */
2552                 tcursor(CURSOR_SAVE);
2553                 break;
2554         case '8': /* DECRC -- Restore Cursor */
2555                 tcursor(CURSOR_LOAD);
2556                 break;
2557         case '\\': /* ST -- String Terminator */
2558                 if(term.esc & ESC_STR_END)
2559                         strhandle();
2560                 break;
2561         default:
2562                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2563                         (uchar) ascii, isprint(ascii)? ascii:'.');
2564                 break;
2565         }
2566         return 1;
2567 }
2568
2569 void
2570 tputc(char *c, int len) {
2571         uchar ascii;
2572         bool control;
2573         long unicodep;
2574         int width;
2575         Glyph *gp;
2576
2577         if(len == 1) {
2578                 width = 1;
2579                 unicodep = ascii = *c;
2580         } else {
2581                 utf8decode(c, &unicodep, UTF_SIZ);
2582                 if ((width = wcwidth(unicodep)) == -1) {
2583                         c = "\357\277\275";     /* UTF_INVALID */
2584                         width = 1;
2585                 }
2586                 control = ISCONTROLC1(unicodep);
2587                 ascii = unicodep;
2588         }
2589
2590         if(IS_SET(MODE_PRINT))
2591                 tprinter(c, len);
2592         control = ISCONTROL(unicodep);
2593
2594         /*
2595          * STR sequence must be checked before anything else
2596          * because it uses all following characters until it
2597          * receives a ESC, a SUB, a ST or any other C1 control
2598          * character.
2599          */
2600         if(term.esc & ESC_STR) {
2601                 if(width == 1 &&
2602                    (ascii == '\a' || ascii == 030 ||
2603                     ascii == 032  || ascii == 033 ||
2604                     ISCONTROLC1(unicodep))) {
2605                         term.esc &= ~(ESC_START|ESC_STR);
2606                         term.esc |= ESC_STR_END;
2607                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2608                         memmove(&strescseq.buf[strescseq.len], c, len);
2609                         strescseq.len += len;
2610                         return;
2611                 } else {
2612                 /*
2613                  * Here is a bug in terminals. If the user never sends
2614                  * some code to stop the str or esc command, then st
2615                  * will stop responding. But this is better than
2616                  * silently failing with unknown characters. At least
2617                  * then users will report back.
2618                  *
2619                  * In the case users ever get fixed, here is the code:
2620                  */
2621                 /*
2622                  * term.esc = 0;
2623                  * strhandle();
2624                  */
2625                         return;
2626                 }
2627         }
2628
2629         /*
2630          * Actions of control codes must be performed as soon they arrive
2631          * because they can be embedded inside a control sequence, and
2632          * they must not cause conflicts with sequences.
2633          */
2634         if(control) {
2635                 tcontrolcode(ascii);
2636                 /*
2637                  * control codes are not shown ever
2638                  */
2639                 return;
2640         } else if(term.esc & ESC_START) {
2641                 if(term.esc & ESC_CSI) {
2642                         csiescseq.buf[csiescseq.len++] = ascii;
2643                         if(BETWEEN(ascii, 0x40, 0x7E)
2644                                         || csiescseq.len >= \
2645                                         sizeof(csiescseq.buf)-1) {
2646                                 term.esc = 0;
2647                                 csiparse();
2648                                 csihandle();
2649                         }
2650                         return;
2651                 } else if(term.esc & ESC_ALTCHARSET) {
2652                         tdeftran(ascii);
2653                 } else if(term.esc & ESC_TEST) {
2654                         tdectest(ascii);
2655                 } else {
2656                         if (!eschandle(ascii))
2657                                 return;
2658                         /* sequence already finished */
2659                 }
2660                 term.esc = 0;
2661                 /*
2662                  * All characters which form part of a sequence are not
2663                  * printed
2664                  */
2665                 return;
2666         }
2667         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2668                 selclear(NULL);
2669
2670         gp = &term.line[term.c.y][term.c.x];
2671         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2672                 gp->mode |= ATTR_WRAP;
2673                 tnewline(1);
2674                 gp = &term.line[term.c.y][term.c.x];
2675         }
2676
2677         if(IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2678                 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2679
2680         if(term.c.x+width > term.col) {
2681                 tnewline(1);
2682                 gp = &term.line[term.c.y][term.c.x];
2683         }
2684
2685         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2686
2687         if(width == 2) {
2688                 gp->mode |= ATTR_WIDE;
2689                 if(term.c.x+1 < term.col) {
2690                         gp[1].c[0] = '\0';
2691                         gp[1].mode = ATTR_WDUMMY;
2692                 }
2693         }
2694         if(term.c.x+width < term.col) {
2695                 tmoveto(term.c.x+width, term.c.y);
2696         } else {
2697                 term.c.state |= CURSOR_WRAPNEXT;
2698         }
2699 }
2700
2701 void
2702 tresize(int col, int row) {
2703         int i;
2704         int minrow = MIN(row, term.row);
2705         int mincol = MIN(col, term.col);
2706         int slide = term.c.y - row + 1;
2707         bool *bp;
2708         TCursor c;
2709
2710         if(col < 1 || row < 1) {
2711                 fprintf(stderr,
2712                         "tresize: error resizing to %dx%d\n", col, row);
2713                 return;
2714         }
2715
2716         /* free unneeded rows */
2717         i = 0;
2718         if(slide > 0) {
2719                 /*
2720                  * slide screen to keep cursor where we expect it -
2721                  * tscrollup would work here, but we can optimize to
2722                  * memmove because we're freeing the earlier lines
2723                  */
2724                 for(/* i = 0 */; i < slide; i++) {
2725                         free(term.line[i]);
2726                         free(term.alt[i]);
2727                 }
2728                 memmove(term.line, term.line + slide, row * sizeof(Line));
2729                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2730         }
2731         for(i += row; i < term.row; i++) {
2732                 free(term.line[i]);
2733                 free(term.alt[i]);
2734         }
2735
2736         /* resize to new height */
2737         term.line = xrealloc(term.line, row * sizeof(Line));
2738         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2739         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2740         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2741
2742         /* resize each row to new width, zero-pad if needed */
2743         for(i = 0; i < minrow; i++) {
2744                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2745                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2746         }
2747
2748         /* allocate any new rows */
2749         for(/* i == minrow */; i < row; i++) {
2750                 term.line[i] = xmalloc(col * sizeof(Glyph));
2751                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2752         }
2753         if(col > term.col) {
2754                 bp = term.tabs + term.col;
2755
2756                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2757                 while(--bp > term.tabs && !*bp)
2758                         /* nothing */ ;
2759                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2760                         *bp = 1;
2761         }
2762         /* update terminal size */
2763         term.col = col;
2764         term.row = row;
2765         /* reset scrolling region */
2766         tsetscroll(0, row-1);
2767         /* make use of the LIMIT in tmoveto */
2768         tmoveto(term.c.x, term.c.y);
2769         /* Clearing both screens (it makes dirty all lines) */
2770         c = term.c;
2771         for(i = 0; i < 2; i++) {
2772                 if(mincol < col && 0 < minrow) {
2773                         tclearregion(mincol, 0, col - 1, minrow - 1);
2774                 }
2775                 if(0 < col && minrow < row) {
2776                         tclearregion(0, minrow, col - 1, row - 1);
2777                 }
2778                 tswapscreen();
2779                 tcursor(CURSOR_LOAD);
2780         }
2781         term.c = c;
2782 }
2783
2784 void
2785 xresize(int col, int row) {
2786         xw.tw = MAX(1, col * xw.cw);
2787         xw.th = MAX(1, row * xw.ch);
2788
2789         XFreePixmap(xw.dpy, xw.buf);
2790         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2791                         DefaultDepth(xw.dpy, xw.scr));
2792         XftDrawChange(xw.draw, xw.buf);
2793         xclear(0, 0, xw.w, xw.h);
2794 }
2795
2796 static inline ushort
2797 sixd_to_16bit(int x) {
2798         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2799 }
2800
2801 void
2802 xloadcols(void) {
2803         int i;
2804         XRenderColor color = { .alpha = 0xffff };
2805         static bool loaded;
2806         Color *cp;
2807
2808         if(loaded) {
2809                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2810                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2811         }
2812
2813         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2814         for(i = 0; i < LEN(colorname); i++) {
2815                 if(!colorname[i])
2816                         continue;
2817                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2818                         die("Could not allocate color '%s'\n", colorname[i]);
2819                 }
2820         }
2821
2822         /* load colors [16-231] ; same colors as xterm */
2823         for(i = 16; i < 6*6*6+16; i++) {
2824                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2825                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2826                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2827                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2828                         die("Could not allocate color %d\n", i);
2829         }
2830
2831         /* load colors [232-255] ; grayscale */
2832         for(; i < 256; i++) {
2833                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2834                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2835                         die("Could not allocate color %d\n", i);
2836         }
2837         loaded = true;
2838 }
2839
2840 int
2841 xsetcolorname(int x, const char *name) {
2842         XRenderColor color = { .alpha = 0xffff };
2843         Color ncolor;
2844
2845         if(!BETWEEN(x, 0, LEN(colorname)))
2846                 return 1;
2847
2848         if(!name) {
2849                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2850                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2851                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2852                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2853                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2854                                                 xw.cmap, &color, &ncolor)) {
2855                                 return 1;
2856                         }
2857
2858                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2859                         dc.col[x] = ncolor;
2860                         return 0;
2861                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2862                         color.red = color.green = color.blue = \
2863                                     0x0808 + 0x0a0a * (x - (16 + 216));
2864                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2865                                                 xw.cmap, &color, &ncolor)) {
2866                                 return 1;
2867                         }
2868
2869                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2870                         dc.col[x] = ncolor;
2871                         return 0;
2872                 } else { /* system colors */
2873                         name = colorname[x];
2874                 }
2875         }
2876         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2877                 return 1;
2878
2879         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2880         dc.col[x] = ncolor;
2881         return 0;
2882 }
2883
2884 void
2885 xtermclear(int col1, int row1, int col2, int row2) {
2886         XftDrawRect(xw.draw,
2887                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2888                         borderpx + col1 * xw.cw,
2889                         borderpx + row1 * xw.ch,
2890                         (col2-col1+1) * xw.cw,
2891                         (row2-row1+1) * xw.ch);
2892 }
2893
2894 /*
2895  * Absolute coordinates.
2896  */
2897 void
2898 xclear(int x1, int y1, int x2, int y2) {
2899         XftDrawRect(xw.draw,
2900                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2901                         x1, y1, x2-x1, y2-y1);
2902 }
2903
2904 void
2905 xhints(void) {
2906         XClassHint class = {opt_class ? opt_class : termname, termname};
2907         XWMHints wm = {.flags = InputHint, .input = 1};
2908         XSizeHints *sizeh = NULL;
2909
2910         sizeh = XAllocSizeHints();
2911
2912         sizeh->flags = PSize | PResizeInc | PBaseSize;
2913         sizeh->height = xw.h;
2914         sizeh->width = xw.w;
2915         sizeh->height_inc = xw.ch;
2916         sizeh->width_inc = xw.cw;
2917         sizeh->base_height = 2 * borderpx;
2918         sizeh->base_width = 2 * borderpx;
2919         if(xw.isfixed == True) {
2920                 sizeh->flags |= PMaxSize | PMinSize;
2921                 sizeh->min_width = sizeh->max_width = xw.w;
2922                 sizeh->min_height = sizeh->max_height = xw.h;
2923         }
2924         if(xw.gm & (XValue|YValue)) {
2925                 sizeh->flags |= USPosition | PWinGravity;
2926                 sizeh->x = xw.l;
2927                 sizeh->y = xw.t;
2928                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2929         }
2930
2931         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2932                         &class);
2933         XFree(sizeh);
2934 }
2935
2936 int
2937 xgeommasktogravity(int mask) {
2938         switch(mask & (XNegative|YNegative)) {
2939         case 0:
2940                 return NorthWestGravity;
2941         case XNegative:
2942                 return NorthEastGravity;
2943         case YNegative:
2944                 return SouthWestGravity;
2945         }
2946         return SouthEastGravity;
2947 }
2948
2949 int
2950 xloadfont(Font *f, FcPattern *pattern) {
2951         FcPattern *match;
2952         FcResult result;
2953
2954         match = FcFontMatch(NULL, pattern, &result);
2955         if(!match)
2956                 return 1;
2957
2958         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2959                 FcPatternDestroy(match);
2960                 return 1;
2961         }
2962
2963         f->set = NULL;
2964         f->pattern = FcPatternDuplicate(pattern);
2965
2966         f->ascent = f->match->ascent;
2967         f->descent = f->match->descent;
2968         f->lbearing = 0;
2969         f->rbearing = f->match->max_advance_width;
2970
2971         f->height = f->ascent + f->descent;
2972         f->width = f->lbearing + f->rbearing;
2973
2974         return 0;
2975 }
2976
2977 void
2978 xloadfonts(char *fontstr, double fontsize) {
2979         FcPattern *pattern;
2980         FcResult r_sz, r_psz;
2981         double fontval;
2982         float ceilf(float);
2983
2984         if(fontstr[0] == '-') {
2985                 pattern = XftXlfdParse(fontstr, False, False);
2986         } else {
2987                 pattern = FcNameParse((FcChar8 *)fontstr);
2988         }
2989
2990         if(!pattern)
2991                 die("st: can't open font %s\n", fontstr);
2992
2993         if(fontsize > 1) {
2994                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2995                 FcPatternDel(pattern, FC_SIZE);
2996                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2997                 usedfontsize = fontsize;
2998         } else {
2999                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
3000                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
3001                 if(r_psz == FcResultMatch) {
3002                         usedfontsize = fontval;
3003                 } else if(r_sz == FcResultMatch) {
3004                         usedfontsize = -1;
3005                 } else {
3006                         /*
3007                          * Default font size is 12, if none given. This is to
3008                          * have a known usedfontsize value.
3009                          */
3010                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3011                         usedfontsize = 12;
3012                 }
3013                 defaultfontsize = usedfontsize;
3014         }
3015
3016         FcConfigSubstitute(0, pattern, FcMatchPattern);
3017         FcDefaultSubstitute(pattern);
3018
3019         if(xloadfont(&dc.font, pattern))
3020                 die("st: can't open font %s\n", fontstr);
3021
3022         if(usedfontsize < 0) {
3023                 FcPatternGetDouble(dc.font.match->pattern,
3024                                    FC_PIXEL_SIZE, 0, &fontval);
3025                 usedfontsize = fontval;
3026                 if(fontsize == 0)
3027                         defaultfontsize = fontval;
3028         }
3029
3030         /* Setting character width and height. */
3031         xw.cw = ceilf(dc.font.width * cwscale);
3032         xw.ch = ceilf(dc.font.height * chscale);
3033
3034         FcPatternDel(pattern, FC_SLANT);
3035         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3036         if(xloadfont(&dc.ifont, pattern))
3037                 die("st: can't open font %s\n", fontstr);
3038
3039         FcPatternDel(pattern, FC_WEIGHT);
3040         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3041         if(xloadfont(&dc.ibfont, pattern))
3042                 die("st: can't open font %s\n", fontstr);
3043
3044         FcPatternDel(pattern, FC_SLANT);
3045         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3046         if(xloadfont(&dc.bfont, pattern))
3047                 die("st: can't open font %s\n", fontstr);
3048
3049         FcPatternDestroy(pattern);
3050 }
3051
3052 int
3053 xloadfontset(Font *f) {
3054         FcResult result;
3055
3056         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3057                 return 1;
3058         return 0;
3059 }
3060
3061 void
3062 xunloadfont(Font *f) {
3063         XftFontClose(xw.dpy, f->match);
3064         FcPatternDestroy(f->pattern);
3065         if(f->set)
3066                 FcFontSetDestroy(f->set);
3067 }
3068
3069 void
3070 xunloadfonts(void) {
3071         /* Free the loaded fonts in the font cache.  */
3072         while(frclen > 0)
3073                 XftFontClose(xw.dpy, frc[--frclen].font);
3074
3075         xunloadfont(&dc.font);
3076         xunloadfont(&dc.bfont);
3077         xunloadfont(&dc.ifont);
3078         xunloadfont(&dc.ibfont);
3079 }
3080
3081 void
3082 xzoom(const Arg *arg) {
3083         Arg larg;
3084
3085         larg.i = usedfontsize + arg->i;
3086         xzoomabs(&larg);
3087 }
3088
3089 void
3090 xzoomabs(const Arg *arg) {
3091         xunloadfonts();
3092         xloadfonts(usedfont, arg->i);
3093         cresize(0, 0);
3094         redraw();
3095         xhints();
3096 }
3097
3098 void
3099 xzoomreset(const Arg *arg) {
3100         Arg larg;
3101
3102         if(defaultfontsize > 0) {
3103                 larg.i = defaultfontsize;
3104                 xzoomabs(&larg);
3105         }
3106 }
3107
3108 void
3109 xinit(void) {
3110         XGCValues gcvalues;
3111         Cursor cursor;
3112         Window parent;
3113         pid_t thispid = getpid();
3114
3115         if(!(xw.dpy = XOpenDisplay(NULL)))
3116                 die("Can't open display\n");
3117         xw.scr = XDefaultScreen(xw.dpy);
3118         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3119
3120         /* font */
3121         if(!FcInit())
3122                 die("Could not init fontconfig.\n");
3123
3124         usedfont = (opt_font == NULL)? font : opt_font;
3125         xloadfonts(usedfont, 0);
3126
3127         /* colors */
3128         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3129         xloadcols();
3130
3131         /* adjust fixed window geometry */
3132         xw.w = 2 * borderpx + term.col * xw.cw;
3133         xw.h = 2 * borderpx + term.row * xw.ch;
3134         if(xw.gm & XNegative)
3135                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3136         if(xw.gm & YNegative)
3137                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3138
3139         /* Events */
3140         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3141         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3142         xw.attrs.bit_gravity = NorthWestGravity;
3143         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3144                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3145                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3146         xw.attrs.colormap = xw.cmap;
3147
3148         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3149                 parent = XRootWindow(xw.dpy, xw.scr);
3150         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3151                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3152                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3153                         | CWEventMask | CWColormap, &xw.attrs);
3154
3155         memset(&gcvalues, 0, sizeof(gcvalues));
3156         gcvalues.graphics_exposures = False;
3157         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3158                         &gcvalues);
3159         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3160                         DefaultDepth(xw.dpy, xw.scr));
3161         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3162         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3163
3164         /* Xft rendering context */
3165         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3166
3167         /* input methods */
3168         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3169                 XSetLocaleModifiers("@im=local");
3170                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3171                         XSetLocaleModifiers("@im=");
3172                         if((xw.xim = XOpenIM(xw.dpy,
3173                                         NULL, NULL, NULL)) == NULL) {
3174                                 die("XOpenIM failed. Could not open input"
3175                                         " device.\n");
3176                         }
3177                 }
3178         }
3179         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3180                                            | XIMStatusNothing, XNClientWindow, xw.win,
3181                                            XNFocusWindow, xw.win, NULL);
3182         if(xw.xic == NULL)
3183                 die("XCreateIC failed. Could not obtain input method.\n");
3184
3185         /* white cursor, black outline */
3186         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3187         XDefineCursor(xw.dpy, xw.win, cursor);
3188         XRecolorCursor(xw.dpy, cursor,
3189                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3190                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3191
3192         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3193         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3194         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3195         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3196
3197         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3198         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3199                         PropModeReplace, (uchar *)&thispid, 1);
3200
3201         xresettitle();
3202         XMapWindow(xw.dpy, xw.win);
3203         xhints();
3204         XSync(xw.dpy, False);
3205 }
3206
3207 void
3208 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3209         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3210             width = charlen * xw.cw, xp, i;
3211         int frcflags;
3212         int u8fl, u8fblen, u8cblen, doesexist;
3213         char *u8c, *u8fs;
3214         long unicodep;
3215         Font *font = &dc.font;
3216         FcResult fcres;
3217         FcPattern *fcpattern, *fontpattern;
3218         FcFontSet *fcsets[] = { NULL };
3219         FcCharSet *fccharset;
3220         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3221         XRenderColor colfg, colbg;
3222         XRectangle r;
3223         int oneatatime;
3224
3225         frcflags = FRC_NORMAL;
3226
3227         if(base.mode & ATTR_ITALIC) {
3228                 if(base.fg == defaultfg)
3229                         base.fg = defaultitalic;
3230                 font = &dc.ifont;
3231                 frcflags = FRC_ITALIC;
3232         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3233                 if(base.fg == defaultfg)
3234                         base.fg = defaultitalic;
3235                 font = &dc.ibfont;
3236                 frcflags = FRC_ITALICBOLD;
3237         } else if(base.mode & ATTR_UNDERLINE) {
3238                 if(base.fg == defaultfg)
3239                         base.fg = defaultunderline;
3240         }
3241
3242         if(IS_TRUECOL(base.fg)) {
3243                 colfg.alpha = 0xffff;
3244                 colfg.red = TRUERED(base.fg);
3245                 colfg.green = TRUEGREEN(base.fg);
3246                 colfg.blue = TRUEBLUE(base.fg);
3247                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3248                 fg = &truefg;
3249         } else {
3250                 fg = &dc.col[base.fg];
3251         }
3252
3253         if(IS_TRUECOL(base.bg)) {
3254                 colbg.alpha = 0xffff;
3255                 colbg.green = TRUEGREEN(base.bg);
3256                 colbg.red = TRUERED(base.bg);
3257                 colbg.blue = TRUEBLUE(base.bg);
3258                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3259                 bg = &truebg;
3260         } else {
3261                 bg = &dc.col[base.bg];
3262         }
3263
3264         if(base.mode & ATTR_BOLD) {
3265                 /*
3266                  * change basic system colors [0-7]
3267                  * to bright system colors [8-15]
3268                  */
3269                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3270                         fg = &dc.col[base.fg + 8];
3271
3272                 if(base.mode & ATTR_ITALIC) {
3273                         font = &dc.ibfont;
3274                         frcflags = FRC_ITALICBOLD;
3275                 } else {
3276                         font = &dc.bfont;
3277                         frcflags = FRC_BOLD;
3278                 }
3279         }
3280
3281         if(IS_SET(MODE_REVERSE)) {
3282                 if(fg == &dc.col[defaultfg]) {
3283                         fg = &dc.col[defaultbg];
3284                 } else {
3285                         colfg.red = ~fg->color.red;
3286                         colfg.green = ~fg->color.green;
3287                         colfg.blue = ~fg->color.blue;
3288                         colfg.alpha = fg->color.alpha;
3289                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3290                                         &revfg);
3291                         fg = &revfg;
3292                 }
3293
3294                 if(bg == &dc.col[defaultbg]) {
3295                         bg = &dc.col[defaultfg];
3296                 } else {
3297                         colbg.red = ~bg->color.red;
3298                         colbg.green = ~bg->color.green;
3299                         colbg.blue = ~bg->color.blue;
3300                         colbg.alpha = bg->color.alpha;
3301                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3302                                         &revbg);
3303                         bg = &revbg;
3304                 }
3305         }
3306
3307         if(base.mode & ATTR_REVERSE) {
3308                 temp = fg;
3309                 fg = bg;
3310                 bg = temp;
3311         }
3312
3313         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3314                 colfg.red = fg->color.red / 2;
3315                 colfg.green = fg->color.green / 2;
3316                 colfg.blue = fg->color.blue / 2;
3317                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3318                 fg = &revfg;
3319         }
3320
3321         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3322                 fg = bg;
3323
3324         if(base.mode & ATTR_INVISIBLE)
3325                 fg = bg;
3326
3327         /* Intelligent cleaning up of the borders. */
3328         if(x == 0) {
3329                 xclear(0, (y == 0)? 0 : winy, borderpx,
3330                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3331         }
3332         if(x + charlen >= term.col) {
3333                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3334                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3335         }
3336         if(y == 0)
3337                 xclear(winx, 0, winx + width, borderpx);
3338         if(y == term.row-1)
3339                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3340
3341         /* Clean up the region we want to draw to. */
3342         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3343
3344         /* Set the clip region because Xft is sometimes dirty. */
3345         r.x = 0;
3346         r.y = 0;
3347         r.height = xw.ch;
3348         r.width = width;
3349         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3350
3351         for(xp = winx; bytelen > 0;) {
3352                 /*
3353                  * Search for the range in the to be printed string of glyphs
3354                  * that are in the main font. Then print that range. If
3355                  * some glyph is found that is not in the font, do the
3356                  * fallback dance.
3357                  */
3358                 u8fs = s;
3359                 u8fblen = 0;
3360                 u8fl = 0;
3361                 oneatatime = font->width != xw.cw;
3362                 for(;;) {
3363                         u8c = s;
3364                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3365                         s += u8cblen;
3366                         bytelen -= u8cblen;
3367
3368                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3369                         if(doesexist) {
3370                                         u8fl++;
3371                                         u8fblen += u8cblen;
3372                                         if(!oneatatime && bytelen > 0)
3373                                                         continue;
3374                         }
3375
3376                         if(u8fl > 0) {
3377                                 XftDrawStringUtf8(xw.draw, fg,
3378                                                 font->match, xp,
3379                                                 winy + font->ascent,
3380                                                 (FcChar8 *)u8fs,
3381                                                 u8fblen);
3382                                 xp += xw.cw * u8fl;
3383                         }
3384                         break;
3385                 }
3386                 if(doesexist) {
3387                         if(oneatatime)
3388                                 continue;
3389                         break;
3390                 }
3391
3392                 /* Search the font cache. */
3393                 for(i = 0; i < frclen; i++) {
3394                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3395                                         && frc[i].flags == frcflags) {
3396                                 break;
3397                         }
3398                 }
3399
3400                 /* Nothing was found. */
3401                 if(i >= frclen) {
3402                         if(!font->set)
3403                                 xloadfontset(font);
3404                         fcsets[0] = font->set;
3405
3406                         /*
3407                          * Nothing was found in the cache. Now use
3408                          * some dozen of Fontconfig calls to get the
3409                          * font for one single character.
3410                          *
3411                          * Xft and fontconfig are design failures.
3412                          */
3413                         fcpattern = FcPatternDuplicate(font->pattern);
3414                         fccharset = FcCharSetCreate();
3415
3416                         FcCharSetAddChar(fccharset, unicodep);
3417                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3418                                         fccharset);
3419                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3420                                         FcTrue);
3421
3422                         FcConfigSubstitute(0, fcpattern,
3423                                         FcMatchPattern);
3424                         FcDefaultSubstitute(fcpattern);
3425
3426                         fontpattern = FcFontSetMatch(0, fcsets,
3427                                         FcTrue, fcpattern, &fcres);
3428
3429                         /*
3430                          * Overwrite or create the new cache entry.
3431                          */
3432                         if(frclen >= LEN(frc)) {
3433                                 frclen = LEN(frc) - 1;
3434                                 XftFontClose(xw.dpy, frc[frclen].font);
3435                         }
3436
3437                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3438                                         fontpattern);
3439                         frc[frclen].flags = frcflags;
3440
3441                         i = frclen;
3442                         frclen++;
3443
3444                         FcPatternDestroy(fcpattern);
3445                         FcCharSetDestroy(fccharset);
3446                 }
3447
3448                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3449                                 xp, winy + frc[i].font->ascent,
3450                                 (FcChar8 *)u8c, u8cblen);
3451
3452                 xp += xw.cw * wcwidth(unicodep);
3453         }
3454
3455         /*
3456          * This is how the loop above actually should be. Why does the
3457          * application have to care about font details?
3458          *
3459          * I have to repeat: Xft and Fontconfig are design failures.
3460          */
3461         /*
3462         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3463                         winy + font->ascent, (FcChar8 *)s, bytelen);
3464         */
3465
3466         if(base.mode & ATTR_UNDERLINE) {
3467                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3468                                 width, 1);
3469         }
3470
3471         if(base.mode & ATTR_STRUCK) {
3472                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3473                                 width, 1);
3474         }
3475
3476         /* Reset clip to none. */
3477         XftDrawSetClip(xw.draw, 0);
3478 }
3479
3480 void
3481 xdrawcursor(void) {
3482         static int oldx = 0, oldy = 0;
3483         int sl, width, curx;
3484         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3485
3486         LIMIT(oldx, 0, term.col-1);
3487         LIMIT(oldy, 0, term.row-1);
3488
3489         curx = term.c.x;
3490
3491         /* adjust position if in dummy */
3492         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3493                 oldx--;
3494         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3495                 curx--;
3496
3497         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3498
3499         /* remove the old cursor */
3500         sl = utf8len(term.line[oldy][oldx].c);
3501         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3502         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3503                         oldy, width, sl);
3504
3505         if(IS_SET(MODE_HIDE))
3506                 return;
3507
3508         /* draw the new one */
3509         if(xw.state & WIN_FOCUSED) {
3510                 if(IS_SET(MODE_REVERSE)) {
3511                         g.mode |= ATTR_REVERSE;
3512                         g.fg = defaultcs;
3513                         g.bg = defaultfg;
3514                 }
3515
3516                 sl = utf8len(g.c);
3517                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3518                         ? 2 : 1;
3519                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3520         } else {
3521                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3522                                 borderpx + curx * xw.cw,
3523                                 borderpx + term.c.y * xw.ch,
3524                                 xw.cw - 1, 1);
3525                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3526                                 borderpx + curx * xw.cw,
3527                                 borderpx + term.c.y * xw.ch,
3528                                 1, xw.ch - 1);
3529                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3530                                 borderpx + (curx + 1) * xw.cw - 1,
3531                                 borderpx + term.c.y * xw.ch,
3532                                 1, xw.ch - 1);
3533                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3534                                 borderpx + curx * xw.cw,
3535                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3536                                 xw.cw, 1);
3537         }
3538         oldx = curx, oldy = term.c.y;
3539 }
3540
3541
3542 void
3543 xsettitle(char *p) {
3544         XTextProperty prop;
3545
3546         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3547                         &prop);
3548         XSetWMName(xw.dpy, xw.win, &prop);
3549         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3550         XFree(prop.value);
3551 }
3552
3553 void
3554 xresettitle(void) {
3555         xsettitle(opt_title ? opt_title : "st");
3556 }
3557
3558 void
3559 redraw(void) {
3560         tfulldirt();
3561         draw();
3562 }
3563
3564 void
3565 draw(void) {
3566         drawregion(0, 0, term.col, term.row);
3567         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3568                         xw.h, 0, 0);
3569         XSetForeground(xw.dpy, dc.gc,
3570                         dc.col[IS_SET(MODE_REVERSE)?
3571                                 defaultfg : defaultbg].pixel);
3572 }
3573
3574 void
3575 drawregion(int x1, int y1, int x2, int y2) {
3576         int ic, ib, x, y, ox, sl;
3577         Glyph base, new;
3578         char buf[DRAW_BUF_SIZ];
3579         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3580         long unicodep;
3581
3582         if(!(xw.state & WIN_VISIBLE))
3583                 return;
3584
3585         for(y = y1; y < y2; y++) {
3586                 if(!term.dirty[y])
3587                         continue;
3588
3589                 xtermclear(0, y, term.col, y);
3590                 term.dirty[y] = 0;
3591                 base = term.line[y][0];
3592                 ic = ib = ox = 0;
3593                 for(x = x1; x < x2; x++) {
3594                         new = term.line[y][x];
3595                         if(new.mode == ATTR_WDUMMY)
3596                                 continue;
3597                         if(ena_sel && selected(x, y))
3598                                 new.mode ^= ATTR_REVERSE;
3599                         if(ib > 0 && (ATTRCMP(base, new)
3600                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3601                                 xdraws(buf, base, ox, y, ic, ib);
3602                                 ic = ib = 0;
3603                         }
3604                         if(ib == 0) {
3605                                 ox = x;
3606                                 base = new;
3607                         }
3608
3609                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3610                         memcpy(buf+ib, new.c, sl);
3611                         ib += sl;
3612                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3613                 }
3614                 if(ib > 0)
3615                         xdraws(buf, base, ox, y, ic, ib);
3616         }
3617         xdrawcursor();
3618 }
3619
3620 void
3621 expose(XEvent *ev) {
3622         XExposeEvent *e = &ev->xexpose;
3623
3624         if(xw.state & WIN_REDRAW) {
3625                 if(!e->count)
3626                         xw.state &= ~WIN_REDRAW;
3627         }
3628         redraw();
3629 }
3630
3631 void
3632 visibility(XEvent *ev) {
3633         XVisibilityEvent *e = &ev->xvisibility;
3634
3635         if(e->state == VisibilityFullyObscured) {
3636                 xw.state &= ~WIN_VISIBLE;
3637         } else if(!(xw.state & WIN_VISIBLE)) {
3638                 /* need a full redraw for next Expose, not just a buf copy */
3639                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3640         }
3641 }
3642
3643 void
3644 unmap(XEvent *ev) {
3645         xw.state &= ~WIN_VISIBLE;
3646 }
3647
3648 void
3649 xsetpointermotion(int set) {
3650         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3651         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3652 }
3653
3654 void
3655 xseturgency(int add) {
3656         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3657
3658         MODBIT(h->flags, add, XUrgencyHint);
3659         XSetWMHints(xw.dpy, xw.win, h);
3660         XFree(h);
3661 }
3662
3663 void
3664 focus(XEvent *ev) {
3665         XFocusChangeEvent *e = &ev->xfocus;
3666
3667         if(e->mode == NotifyGrab)
3668                 return;
3669
3670         if(ev->type == FocusIn) {
3671                 XSetICFocus(xw.xic);
3672                 xw.state |= WIN_FOCUSED;
3673                 xseturgency(0);
3674                 if(IS_SET(MODE_FOCUS))
3675                         ttywrite("\033[I", 3);
3676         } else {
3677                 XUnsetICFocus(xw.xic);
3678                 xw.state &= ~WIN_FOCUSED;
3679                 if(IS_SET(MODE_FOCUS))
3680                         ttywrite("\033[O", 3);
3681         }
3682 }
3683
3684 static inline bool
3685 match(uint mask, uint state) {
3686         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3687 }
3688
3689 void
3690 numlock(const Arg *dummy) {
3691         term.numlock ^= 1;
3692 }
3693
3694 char*
3695 kmap(KeySym k, uint state) {
3696         Key *kp;
3697         int i;
3698
3699         /* Check for mapped keys out of X11 function keys. */
3700         for(i = 0; i < LEN(mappedkeys); i++) {
3701                 if(mappedkeys[i] == k)
3702                         break;
3703         }
3704         if(i == LEN(mappedkeys)) {
3705                 if((k & 0xFFFF) < 0xFD00)
3706                         return NULL;
3707         }
3708
3709         for(kp = key; kp < key + LEN(key); kp++) {
3710                 if(kp->k != k)
3711                         continue;
3712
3713                 if(!match(kp->mask, state))
3714                         continue;
3715
3716                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3717                         continue;
3718                 if(term.numlock && kp->appkey == 2)
3719                         continue;
3720
3721                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3722                         continue;
3723
3724                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3725                         continue;
3726
3727                 return kp->s;
3728         }
3729
3730         return NULL;
3731 }
3732
3733 void
3734 kpress(XEvent *ev) {
3735         XKeyEvent *e = &ev->xkey;
3736         KeySym ksym;
3737         char buf[32], *customkey;
3738         int len;
3739         long c;
3740         Status status;
3741         Shortcut *bp;
3742
3743         if(IS_SET(MODE_KBDLOCK))
3744                 return;
3745
3746         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3747         /* 1. shortcuts */
3748         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3749                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3750                         bp->func(&(bp->arg));
3751                         return;
3752                 }
3753         }
3754
3755         /* 2. custom keys from config.h */
3756         if((customkey = kmap(ksym, e->state))) {
3757                 ttysend(customkey, strlen(customkey));
3758                 return;
3759         }
3760
3761         /* 3. composed string from input method */
3762         if(len == 0)
3763                 return;
3764         if(len == 1 && e->state & Mod1Mask) {
3765                 if(IS_SET(MODE_8BIT)) {
3766                         if(*buf < 0177) {
3767                                 c = *buf | 0x80;
3768                                 len = utf8encode(c, buf, UTF_SIZ);
3769                         }
3770                 } else {
3771                         buf[1] = buf[0];
3772                         buf[0] = '\033';
3773                         len = 2;
3774                 }
3775         }
3776         ttysend(buf, len);
3777 }
3778
3779
3780 void
3781 cmessage(XEvent *e) {
3782         /*
3783          * See xembed specs
3784          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3785          */
3786         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3787                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3788                         xw.state |= WIN_FOCUSED;
3789                         xseturgency(0);
3790                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3791                         xw.state &= ~WIN_FOCUSED;
3792                 }
3793         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3794                 /* Send SIGHUP to shell */
3795                 kill(pid, SIGHUP);
3796                 exit(EXIT_SUCCESS);
3797         }
3798 }
3799
3800 void
3801 cresize(int width, int height) {
3802         int col, row;
3803
3804         if(width != 0)
3805                 xw.w = width;
3806         if(height != 0)
3807                 xw.h = height;
3808
3809         col = (xw.w - 2 * borderpx) / xw.cw;
3810         row = (xw.h - 2 * borderpx) / xw.ch;
3811
3812         tresize(col, row);
3813         xresize(col, row);
3814         ttyresize();
3815 }
3816
3817 void
3818 resize(XEvent *e) {
3819         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3820                 return;
3821
3822         cresize(e->xconfigure.width, e->xconfigure.height);
3823 }
3824
3825 void
3826 run(void) {
3827         XEvent ev;
3828         int w = xw.w, h = xw.h;
3829         fd_set rfd;
3830         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3831         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3832         long deltatime;
3833
3834         /* Waiting for window mapping */
3835         while(1) {
3836                 XNextEvent(xw.dpy, &ev);
3837                 if(XFilterEvent(&ev, None))
3838                         continue;
3839                 if(ev.type == ConfigureNotify) {
3840                         w = ev.xconfigure.width;
3841                         h = ev.xconfigure.height;
3842                 } else if(ev.type == MapNotify) {
3843                         break;
3844                 }
3845         }
3846
3847         ttynew();
3848         cresize(w, h);
3849
3850         clock_gettime(CLOCK_MONOTONIC, &last);
3851         lastblink = last;
3852
3853         for(xev = actionfps;;) {
3854                 FD_ZERO(&rfd);
3855                 FD_SET(cmdfd, &rfd);
3856                 FD_SET(xfd, &rfd);
3857
3858                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3859                         if(errno == EINTR)
3860                                 continue;
3861                         die("select failed: %s\n", strerror(errno));
3862                 }
3863                 if(FD_ISSET(cmdfd, &rfd)) {
3864                         ttyread();
3865                         if(blinktimeout) {
3866                                 blinkset = tattrset(ATTR_BLINK);
3867                                 if(!blinkset)
3868                                         MODBIT(term.mode, 0, MODE_BLINK);
3869                         }
3870                 }
3871
3872                 if(FD_ISSET(xfd, &rfd))
3873                         xev = actionfps;
3874
3875                 clock_gettime(CLOCK_MONOTONIC, &now);
3876                 drawtimeout.tv_sec = 0;
3877                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3878                 tv = &drawtimeout;
3879
3880                 dodraw = 0;
3881                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3882                         tsetdirtattr(ATTR_BLINK);
3883                         term.mode ^= MODE_BLINK;
3884                         lastblink = now;
3885                         dodraw = 1;
3886                 }
3887                 deltatime = TIMEDIFF(now, last);
3888                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3889                                 || deltatime < 0) {
3890                         dodraw = 1;
3891                         last = now;
3892                 }
3893
3894                 if(dodraw) {
3895                         while(XPending(xw.dpy)) {
3896                                 XNextEvent(xw.dpy, &ev);
3897                                 if(XFilterEvent(&ev, None))
3898                                         continue;
3899                                 if(handler[ev.type])
3900                                         (handler[ev.type])(&ev);
3901                         }
3902
3903                         draw();
3904                         XFlush(xw.dpy);
3905
3906                         if(xev && !FD_ISSET(xfd, &rfd))
3907                                 xev--;
3908                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3909                                 if(blinkset) {
3910                                         if(TIMEDIFF(now, lastblink) \
3911                                                         > blinktimeout) {
3912                                                 drawtimeout.tv_nsec = 1000;
3913                                         } else {
3914                                                 drawtimeout.tv_nsec = (1E6 * \
3915                                                         (blinktimeout - \
3916                                                         TIMEDIFF(now,
3917                                                                 lastblink)));
3918                                         }
3919                                         drawtimeout.tv_sec = \
3920                                             drawtimeout.tv_nsec / 1E9;
3921                                         drawtimeout.tv_nsec %= (long)1E9;
3922                                 } else {
3923                                         tv = NULL;
3924                                 }
3925                         }
3926                 }
3927         }
3928 }
3929
3930 void
3931 usage(void) {
3932         die("%s " VERSION " (c) 2010-2015 st engineers\n" \
3933         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3934         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3935 }
3936
3937 int
3938 main(int argc, char *argv[]) {
3939         char *titles;
3940         uint cols = 80, rows = 24;
3941
3942         xw.l = xw.t = 0;
3943         xw.isfixed = False;
3944
3945         ARGBEGIN {
3946         case 'a':
3947                 allowaltscreen = false;
3948                 break;
3949         case 'c':
3950                 opt_class = EARGF(usage());
3951                 break;
3952         case 'e':
3953                 /* eat all remaining arguments */
3954                 if(argc > 1) {
3955                         opt_cmd = &argv[1];
3956                         if(argv[1] != NULL && opt_title == NULL) {
3957                                 titles = xstrdup(argv[1]);
3958                                 opt_title = basename(titles);
3959                         }
3960                 }
3961                 goto run;
3962         case 'f':
3963                 opt_font = EARGF(usage());
3964                 break;
3965         case 'g':
3966                 xw.gm = XParseGeometry(EARGF(usage()),
3967                                 &xw.l, &xw.t, &cols, &rows);
3968                 break;
3969         case 'i':
3970                 xw.isfixed = True;
3971                 break;
3972         case 'o':
3973                 opt_io = EARGF(usage());
3974                 break;
3975         case 't':
3976                 opt_title = EARGF(usage());
3977                 break;
3978         case 'w':
3979                 opt_embed = EARGF(usage());
3980                 break;
3981         case 'v':
3982         default:
3983                 usage();
3984         } ARGEND;
3985
3986 run:
3987         setlocale(LC_CTYPE, "");
3988         XSetLocaleModifiers("");
3989         tnew(cols? cols : 1, rows? rows : 1);
3990         xinit();
3991         selinit();
3992         run();
3993
3994         return 0;
3995 }
3996