st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  80 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  81
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_BOLD      = 1,
  92         ATTR_FAINT     = 2,
  93         ATTR_ITALIC    = 4,
  94         ATTR_UNDERLINE = 8,
  95         ATTR_BLINK     = 16,
  96         ATTR_REVERSE   = 32,
  97         ATTR_INVISIBLE = 64,
  98         ATTR_STRUCK    = 128,
  99         ATTR_WRAP      = 256,
 100         ATTR_WIDE      = 512,
 101         ATTR_WDUMMY    = 1024,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1,
 117         MODE_INSERT      = 2,
 118         MODE_APPKEYPAD   = 4,
 119         MODE_ALTSCREEN   = 8,
 120         MODE_CRLF        = 16,
 121         MODE_MOUSEBTN    = 32,
 122         MODE_MOUSEMOTION = 64,
 123         MODE_REVERSE     = 128,
 124         MODE_KBDLOCK     = 256,
 125         MODE_HIDE        = 512,
 126         MODE_ECHO        = 1024,
 127         MODE_APPCURSOR   = 2048,
 128         MODE_MOUSESGR    = 4096,
 129         MODE_8BIT        = 8192,
 130         MODE_BLINK       = 16384,
 131         MODE_FBLINK      = 32768,
 132         MODE_FOCUS       = 65536,
 133         MODE_MOUSEX10    = 131072,
 134         MODE_MOUSEMANY   = 262144,
 135         MODE_BRCKTPASTE  = 524288,
 136         MODE_PRINT       = 1048576,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Color;
 183
 184 typedef struct {
 185         char c[UTF_SIZ]; /* character code */
 186         ushort mode;      /* attribute flags */
 187         uint32_t fg;      /* foreground  */
 188         uint32_t bg;      /* background  */
 189 } Glyph;
 190
 191 typedef Glyph *Line;
 192
 193 typedef struct {
 194         Glyph attr; /* current char attributes */
 195         int x;
 196         int y;
 197         char state;
 198 } TCursor;
 199
 200 /* CSI Escape sequence structs */
 201 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 202 typedef struct {
 203         char buf[ESC_BUF_SIZ]; /* raw string */
 204         int len;               /* raw string length */
 205         char priv;
 206         int arg[ESC_ARG_SIZ];
 207         int narg;              /* nb of args */
 208         char mode;
 209 } CSIEscape;
 210
 211 /* STR Escape sequence structs */
 212 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 213 typedef struct {
 214         char type;             /* ESC type ... */
 215         char buf[STR_BUF_SIZ]; /* raw string */
 216         int len;               /* raw string length */
 217         char *args[STR_ARG_SIZ];
 218         int narg;              /* nb of args */
 219 } STREscape;
 220
 221 /* Internal representation of the screen */
 222 typedef struct {
 223         int row;      /* nb row */
 224         int col;      /* nb col */
 225         Line *line;   /* screen */
 226         Line *alt;    /* alternate screen */
 227         bool *dirty;  /* dirtyness of lines */
 228         TCursor c;    /* cursor */
 229         int top;      /* top    scroll limit */
 230         int bot;      /* bottom scroll limit */
 231         int mode;     /* terminal mode flags */
 232         int esc;      /* escape state flags */
 233         char trantbl[4]; /* charset table translation */
 234         int charset;  /* current charset */
 235         int icharset; /* selected charset for sequence */
 236         bool numlock; /* lock numbers in keyboard */
 237         bool *tabs;
 238 } Term;
 239
 240 /* Purely graphic info */
 241 typedef struct {
 242         Display *dpy;
 243         Colormap cmap;
 244         Window win;
 245         Drawable buf;
 246         Atom xembed, wmdeletewin, netwmname, netwmpid;
 247         XIM xim;
 248         XIC xic;
 249         Draw draw;
 250         Visual *vis;
 251         XSetWindowAttributes attrs;
 252         int scr;
 253         bool isfixed; /* is fixed geometry? */
 254         int l, t; /* left and top offset */
 255         int gm; /* geometry mask */
 256         int tw, th; /* tty width and height */
 257         int w, h; /* window width and height */
 258         int ch; /* char height */
 259         int cw; /* char width  */
 260         char state; /* focus, redraw, visible */
 261 } XWindow;
 262
 263 typedef struct {
 264         uint b;
 265         uint mask;
 266         char *s;
 267 } Mousekey;
 268
 269 typedef struct {
 270         KeySym k;
 271         uint mask;
 272         char *s;
 273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 274         signed char appkey;    /* application keypad */
 275         signed char appcursor; /* application cursor */
 276         signed char crlf;      /* crlf mode          */
 277 } Key;
 278
 279 typedef struct {
 280         int mode;
 281         int type;
 282         int snap;
 283         /*
 284          * Selection variables:
 285          * nb – normalized coordinates of the beginning of the selection
 286          * ne – normalized coordinates of the end of the selection
 287          * ob – original coordinates of the beginning of the selection
 288          * oe – original coordinates of the end of the selection
 289          */
 290         struct {
 291                 int x, y;
 292         } nb, ne, ob, oe;
 293
 294         char *clip;
 295         Atom xtarget;
 296         bool alt;
 297         struct timespec tclick1;
 298         struct timespec tclick2;
 299 } Selection;
 300
 301 typedef union {
 302         int i;
 303         uint ui;
 304         float f;
 305         const void *v;
 306 } Arg;
 307
 308 typedef struct {
 309         uint mod;
 310         KeySym keysym;
 311         void (*func)(const Arg *);
 312         const Arg arg;
 313 } Shortcut;
 314
 315 /* function definitions used in config.h */
 316 static void clippaste(const Arg *);
 317 static void numlock(const Arg *);
 318 static void selpaste(const Arg *);
 319 static void xzoom(const Arg *);
 320 static void printsel(const Arg *);
 321 static void printscreen(const Arg *) ;
 322 static void toggleprinter(const Arg *);
 323
 324 /* Config.h for applying patches and the configuration. */
 325 #include "config.h"
 326
 327 /* Font structure */
 328 typedef struct {
 329         int height;
 330         int width;
 331         int ascent;
 332         int descent;
 333         short lbearing;
 334         short rbearing;
 335         XftFont *match;
 336         FcFontSet *set;
 337         FcPattern *pattern;
 338 } Font;
 339
 340 /* Drawing Context */
 341 typedef struct {
 342         Color col[MAX(LEN(colorname), 256)];
 343         Font font, bfont, ifont, ibfont;
 344         GC gc;
 345 } DC;
 346
 347 static void die(const char *, ...);
 348 static void draw(void);
 349 static void redraw(int);
 350 static void drawregion(int, int, int, int);
 351 static void execsh(void);
 352 static void sigchld(int);
 353 static void run(void);
 354
 355 static void csidump(void);
 356 static void csihandle(void);
 357 static void csiparse(void);
 358 static void csireset(void);
 359 static void strdump(void);
 360 static void strhandle(void);
 361 static void strparse(void);
 362 static void strreset(void);
 363
 364 static int tattrset(int);
 365 static void tprinter(char *, size_t);
 366 static void tdumpsel(void);
 367 static void tdumpline(int);
 368 static void tdump(void);
 369 static void tclearregion(int, int, int, int);
 370 static void tcursor(int);
 371 static void tdeletechar(int);
 372 static void tdeleteline(int);
 373 static void tinsertblank(int);
 374 static void tinsertblankline(int);
 375 static int tlinelen(int);
 376 static void tmoveto(int, int);
 377 static void tmoveato(int, int);
 378 static void tnew(int, int);
 379 static void tnewline(int);
 380 static void tputtab(int);
 381 static void tputc(char *, int);
 382 static void treset(void);
 383 static void tresize(int, int);
 384 static void tscrollup(int, int);
 385 static void tscrolldown(int, int);
 386 static void tsetattr(int *, int);
 387 static void tsetchar(char *, Glyph *, int, int);
 388 static void tsetscroll(int, int);
 389 static void tswapscreen(void);
 390 static void tsetdirt(int, int);
 391 static void tsetdirtattr(int);
 392 static void tsetmode(bool, bool, int *, int);
 393 static void tfulldirt(void);
 394 static void techo(char *, int);
 395 static void tcontrolcode(uchar );
 396 static void tdectest(char );
 397 static int32_t tdefcolor(int *, int *, int);
 398 static void tdeftran(char);
 399 static inline bool match(uint, uint);
 400 static void ttynew(void);
 401 static void ttyread(void);
 402 static void ttyresize(void);
 403 static void ttysend(char *, size_t);
 404 static void ttywrite(const char *, size_t);
 405 static void tstrsequence(uchar c);
 406
 407 static void xdraws(char *, Glyph, int, int, int, int);
 408 static void xhints(void);
 409 static void xclear(int, int, int, int);
 410 static void xdrawcursor(void);
 411 static void xinit(void);
 412 static void xloadcols(void);
 413 static int xsetcolorname(int, const char *);
 414 static int xgeommasktogravity(int);
 415 static int xloadfont(Font *, FcPattern *);
 416 static void xloadfonts(char *, double);
 417 static int xloadfontset(Font *);
 418 static void xsettitle(char *);
 419 static void xresettitle(void);
 420 static void xsetpointermotion(int);
 421 static void xseturgency(int);
 422 static void xsetsel(char *);
 423 static void xtermclear(int, int, int, int);
 424 static void xunloadfont(Font *);
 425 static void xunloadfonts(void);
 426 static void xresize(int, int);
 427
 428 static void expose(XEvent *);
 429 static void visibility(XEvent *);
 430 static void unmap(XEvent *);
 431 static char *kmap(KeySym, uint);
 432 static void kpress(XEvent *);
 433 static void cmessage(XEvent *);
 434 static void cresize(int, int);
 435 static void resize(XEvent *);
 436 static void focus(XEvent *);
 437 static void brelease(XEvent *);
 438 static void bpress(XEvent *);
 439 static void bmotion(XEvent *);
 440 static void selnotify(XEvent *);
 441 static void selclear(XEvent *);
 442 static void selrequest(XEvent *);
 443
 444 static void selinit(void);
 445 static void selnormalize(void);
 446 static inline bool selected(int, int);
 447 static char *getsel(void);
 448 static void selcopy(void);
 449 static void selscroll(int, int);
 450 static void selsnap(int, int *, int *, int);
 451 static void getbuttoninfo(XEvent *);
 452 static void mousereport(XEvent *);
 453
 454 static size_t utf8decode(char *, long *, size_t);
 455 static long utf8decodebyte(char, size_t *);
 456 static size_t utf8encode(long, char *, size_t);
 457 static char utf8encodebyte(long, size_t);
 458 static size_t utf8len(char *);
 459 static size_t utf8validate(long *, size_t);
 460
 461 static ssize_t xwrite(int, const char *, size_t);
 462 static void *xmalloc(size_t);
 463 static void *xrealloc(void *, size_t);
 464 static char *xstrdup(char *);
 465
 466 static void usage(void);
 467
 468 static void (*handler[LASTEvent])(XEvent *) = {
 469         [KeyPress] = kpress,
 470         [ClientMessage] = cmessage,
 471         [ConfigureNotify] = resize,
 472         [VisibilityNotify] = visibility,
 473         [UnmapNotify] = unmap,
 474         [Expose] = expose,
 475         [FocusIn] = focus,
 476         [FocusOut] = focus,
 477         [MotionNotify] = bmotion,
 478         [ButtonPress] = bpress,
 479         [ButtonRelease] = brelease,
 480         [SelectionClear] = selclear,
 481         [SelectionNotify] = selnotify,
 482         [SelectionRequest] = selrequest,
 483 };
 484
 485 /* Globals */
 486 static DC dc;
 487 static XWindow xw;
 488 static Term term;
 489 static CSIEscape csiescseq;
 490 static STREscape strescseq;
 491 static int cmdfd;
 492 static pid_t pid;
 493 static Selection sel;
 494 static int iofd = STDOUT_FILENO;
 495 static char **opt_cmd = NULL;
 496 static char *opt_io = NULL;
 497 static char *opt_title = NULL;
 498 static char *opt_embed = NULL;
 499 static char *opt_class = NULL;
 500 static char *opt_font = NULL;
 501 static int oldbutton = 3; /* button event on startup: 3 = release */
 502
 503 static char *usedfont = NULL;
 504 static double usedfontsize = 0;
 505
 506 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 507 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 508 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 509 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 510
 511 /* Font Ring Cache */
 512 enum {
 513         FRC_NORMAL,
 514         FRC_ITALIC,
 515         FRC_BOLD,
 516         FRC_ITALICBOLD
 517 };
 518
 519 typedef struct {
 520         XftFont *font;
 521         int flags;
 522 } Fontcache;
 523
 524 /* Fontcache is an array now. A new font will be appended to the array. */
 525 static Fontcache frc[16];
 526 static int frclen = 0;
 527
 528 ssize_t
 529 xwrite(int fd, const char *s, size_t len) {
 530         size_t aux = len;
 531
 532         while(len > 0) {
 533                 ssize_t r = write(fd, s, len);
 534                 if(r < 0)
 535                         return r;
 536                 len -= r;
 537                 s += r;
 538         }
 539         return aux;
 540 }
 541
 542 void *
 543 xmalloc(size_t len) {
 544         void *p = malloc(len);
 545
 546         if(!p)
 547                 die("Out of memory\n");
 548
 549         return p;
 550 }
 551
 552 void *
 553 xrealloc(void *p, size_t len) {
 554         if((p = realloc(p, len)) == NULL)
 555                 die("Out of memory\n");
 556
 557         return p;
 558 }
 559
 560 char *
 561 xstrdup(char *s) {
 562         if((s = strdup(s)) == NULL)
 563                 die("Out of memory\n");
 564
 565         return s;
 566 }
 567
 568 size_t
 569 utf8decode(char *c, long *u, size_t clen) {
 570         size_t i, j, len, type;
 571         long udecoded;
 572
 573         *u = UTF_INVALID;
 574         if(!clen)
 575                 return 0;
 576         udecoded = utf8decodebyte(c[0], &len);
 577         if(!BETWEEN(len, 1, UTF_SIZ))
 578                 return 1;
 579         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 580                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 581                 if(type != 0)
 582                         return j;
 583         }
 584         if(j < len)
 585                 return 0;
 586         *u = udecoded;
 587         utf8validate(u, len);
 588         return len;
 589 }
 590
 591 long
 592 utf8decodebyte(char c, size_t *i) {
 593         for(*i = 0; *i < LEN(utfmask); ++(*i))
 594                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 595                         return (uchar)c & ~utfmask[*i];
 596         return 0;
 597 }
 598
 599 size_t
 600 utf8encode(long u, char *c, size_t clen) {
 601         size_t len, i;
 602
 603         len = utf8validate(&u, 0);
 604         if(clen < len)
 605                 return 0;
 606         for(i = len - 1; i != 0; --i) {
 607                 c[i] = utf8encodebyte(u, 0);
 608                 u >>= 6;
 609         }
 610         c[0] = utf8encodebyte(u, len);
 611         return len;
 612 }
 613
 614 char
 615 utf8encodebyte(long u, size_t i) {
 616         return utfbyte[i] | (u & ~utfmask[i]);
 617 }
 618
 619 size_t
 620 utf8len(char *c) {
 621         return utf8decode(c, &(long){0}, UTF_SIZ);
 622 }
 623
 624 size_t
 625 utf8validate(long *u, size_t i) {
 626         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 627                 *u = UTF_INVALID;
 628         for(i = 1; *u > utfmax[i]; ++i)
 629                 ;
 630         return i;
 631 }
 632
 633 static void
 634 selinit(void) {
 635         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 636         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 637         sel.mode = 0;
 638         sel.ob.x = -1;
 639         sel.clip = NULL;
 640         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 641         if(sel.xtarget == None)
 642                 sel.xtarget = XA_STRING;
 643 }
 644
 645 static int
 646 x2col(int x) {
 647         x -= borderpx;
 648         x /= xw.cw;
 649
 650         return LIMIT(x, 0, term.col-1);
 651 }
 652
 653 static int
 654 y2row(int y) {
 655         y -= borderpx;
 656         y /= xw.ch;
 657
 658         return LIMIT(y, 0, term.row-1);
 659 }
 660
 661 static int tlinelen(int y) {
 662         int i = term.col;
 663
 664         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 665                 --i;
 666
 667         return i;
 668 }
 669
 670 static void
 671 selnormalize(void) {
 672         int i;
 673
 674         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 675                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 676                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 677         } else {
 678                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 679                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 680         }
 681         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 682         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 683
 684         /* expand selection over line breaks */
 685         if (sel.type == SEL_RECTANGULAR)
 686                 return;
 687         i = tlinelen(sel.nb.y);
 688         if (i < sel.nb.x)
 689                 sel.nb.x = i;
 690         if (tlinelen(sel.ne.y) <= sel.ne.x)
 691                 sel.ne.x = term.col - 1;
 692 }
 693
 694 static inline bool
 695 selected(int x, int y) {
 696         if(sel.type == SEL_RECTANGULAR)
 697                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 698                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 699
 700         return BETWEEN(y, sel.nb.y, sel.ne.y)
 701             && (y != sel.nb.y || x >= sel.nb.x)
 702             && (y != sel.ne.y || x <= sel.ne.x);
 703 }
 704
 705 void
 706 selsnap(int mode, int *x, int *y, int direction) {
 707         int newx, newy, xt, yt;
 708         Glyph *gp;
 709
 710         switch(mode) {
 711         case SNAP_WORD:
 712                 /*
 713                  * Snap around if the word wraps around at the end or
 714                  * beginning of a line.
 715                  */
 716                 for(;;) {
 717                         newx = *x + direction;
 718                         newy = *y;
 719                         if(!BETWEEN(newx, 0, term.col - 1)) {
 720                                 newy += direction;
 721                                 newx = (newx + term.col) % term.col;
 722                                 if (!BETWEEN(newy, 0, term.row - 1))
 723                                         break;
 724
 725                                 if(direction > 0)
 726                                         yt = *y, xt = *x;
 727                                 else
 728                                         yt = newy, xt = newx;
 729                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 730                                         break;
 731                         }
 732
 733                         if (newx >= tlinelen(newy))
 734                                 break;
 735
 736                         gp = &term.line[newy][newx];
 737                         if (!(gp->mode & ATTR_WDUMMY) && strchr(worddelimiters, gp->c[0]))
 738                                 break;
 739
 740                         *x = newx;
 741                         *y = newy;
 742                 }
 743                 break;
 744         case SNAP_LINE:
 745                 /*
 746                  * Snap around if the the previous line or the current one
 747                  * has set ATTR_WRAP at its end. Then the whole next or
 748                  * previous line will be selected.
 749                  */
 750                 *x = (direction < 0) ? 0 : term.col - 1;
 751                 if(direction < 0 && *y > 0) {
 752                         for(; *y > 0; *y += direction) {
 753                                 if(!(term.line[*y-1][term.col-1].mode
 754                                                 & ATTR_WRAP)) {
 755                                         break;
 756                                 }
 757                         }
 758                 } else if(direction > 0 && *y < term.row-1) {
 759                         for(; *y < term.row; *y += direction) {
 760                                 if(!(term.line[*y][term.col-1].mode
 761                                                 & ATTR_WRAP)) {
 762                                         break;
 763                                 }
 764                         }
 765                 }
 766                 break;
 767         }
 768 }
 769
 770 void
 771 getbuttoninfo(XEvent *e) {
 772         int type;
 773         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 774
 775         sel.alt = IS_SET(MODE_ALTSCREEN);
 776
 777         sel.oe.x = x2col(e->xbutton.x);
 778         sel.oe.y = y2row(e->xbutton.y);
 779
 780         if(sel.ob.y < sel.oe.y
 781                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 782                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 783                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 784         } else {
 785                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 786                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 787         }
 788         selnormalize();
 789
 790         sel.type = SEL_REGULAR;
 791         for(type = 1; type < LEN(selmasks); ++type) {
 792                 if(match(selmasks[type], state)) {
 793                         sel.type = type;
 794                         break;
 795                 }
 796         }
 797 }
 798
 799 void
 800 mousereport(XEvent *e) {
 801         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 802             button = e->xbutton.button, state = e->xbutton.state,
 803             len;
 804         char buf[40];
 805         static int ox, oy;
 806
 807         /* from urxvt */
 808         if(e->xbutton.type == MotionNotify) {
 809                 if(x == ox && y == oy)
 810                         return;
 811                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 812                         return;
 813                 /* MOUSE_MOTION: no reporting if no button is pressed */
 814                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 815                         return;
 816
 817                 button = oldbutton + 32;
 818                 ox = x;
 819                 oy = y;
 820         } else {
 821                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 822                         button = 3;
 823                 } else {
 824                         button -= Button1;
 825                         if(button >= 3)
 826                                 button += 64 - 3;
 827                 }
 828                 if(e->xbutton.type == ButtonPress) {
 829                         oldbutton = button;
 830                         ox = x;
 831                         oy = y;
 832                 } else if(e->xbutton.type == ButtonRelease) {
 833                         oldbutton = 3;
 834                         /* MODE_MOUSEX10: no button release reporting */
 835                         if(IS_SET(MODE_MOUSEX10))
 836                                 return;
 837                         if (button == 64 || button == 65)
 838                                 return;
 839                 }
 840         }
 841
 842         if(!IS_SET(MODE_MOUSEX10)) {
 843                 button += (state & ShiftMask   ? 4  : 0)
 844                         + (state & Mod4Mask    ? 8  : 0)
 845                         + (state & ControlMask ? 16 : 0);
 846         }
 847
 848         len = 0;
 849         if(IS_SET(MODE_MOUSESGR)) {
 850                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 851                                 button, x+1, y+1,
 852                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 853         } else if(x < 223 && y < 223) {
 854                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 855                                 32+button, 32+x+1, 32+y+1);
 856         } else {
 857                 return;
 858         }
 859
 860         ttywrite(buf, len);
 861 }
 862
 863 void
 864 bpress(XEvent *e) {
 865         struct timespec now;
 866         Mousekey *mk;
 867
 868         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 869                 mousereport(e);
 870                 return;
 871         }
 872
 873         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 874                 if(e->xbutton.button == mk->b
 875                                 && match(mk->mask, e->xbutton.state)) {
 876                         ttysend(mk->s, strlen(mk->s));
 877                         return;
 878                 }
 879         }
 880
 881         if(e->xbutton.button == Button1) {
 882                 clock_gettime(CLOCK_MONOTONIC, &now);
 883
 884                 /* Clear previous selection, logically and visually. */
 885                 selclear(NULL);
 886                 sel.mode = 1;
 887                 sel.type = SEL_REGULAR;
 888                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 889                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 890
 891                 /*
 892                  * If the user clicks below predefined timeouts specific
 893                  * snapping behaviour is exposed.
 894                  */
 895                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 896                         sel.snap = SNAP_LINE;
 897                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 898                         sel.snap = SNAP_WORD;
 899                 } else {
 900                         sel.snap = 0;
 901                 }
 902                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 903                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 904                 selnormalize();
 905
 906                 /*
 907                  * Draw selection, unless it's regular and we don't want to
 908                  * make clicks visible
 909                  */
 910                 if(sel.snap != 0) {
 911                         sel.mode++;
 912                         tsetdirt(sel.nb.y, sel.ne.y);
 913                 }
 914                 sel.tclick2 = sel.tclick1;
 915                 sel.tclick1 = now;
 916         }
 917 }
 918
 919 char *
 920 getsel(void) {
 921         char *str, *ptr;
 922         int y, bufsize, size, lastx, linelen;
 923         Glyph *gp, *last;
 924
 925         if(sel.ob.x == -1)
 926                 return NULL;
 927
 928         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 929         ptr = str = xmalloc(bufsize);
 930
 931         /* append every set & selected glyph to the selection */
 932         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 933                 linelen = tlinelen(y);
 934
 935                 if(sel.type == SEL_RECTANGULAR) {
 936                         gp = &term.line[y][sel.nb.x];
 937                         lastx = sel.ne.x;
 938                 } else {
 939                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 940                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 941                 }
 942                 last = &term.line[y][MIN(lastx, linelen-1)];
 943
 944                 for( ; gp <= last; ++gp) {
 945                         if(gp->mode & ATTR_WDUMMY)
 946                                 continue;
 947
 948                         size = utf8len(gp->c);
 949                         memcpy(ptr, gp->c, size);
 950                         ptr += size;
 951                 }
 952
 953                 /*
 954                  * Copy and pasting of line endings is inconsistent
 955                  * in the inconsistent terminal and GUI world.
 956                  * The best solution seems like to produce '\n' when
 957                  * something is copied from st and convert '\n' to
 958                  * '\r', when something to be pasted is received by
 959                  * st.
 960                  * FIXME: Fix the computer world.
 961                  */
 962                 if(sel.ne.y > y || lastx >= linelen)
 963                         *ptr++ = '\n';
 964         }
 965         *ptr = 0;
 966         return str;
 967 }
 968
 969 void
 970 selcopy(void) {
 971         xsetsel(getsel());
 972 }
 973
 974 void
 975 selnotify(XEvent *e) {
 976         ulong nitems, ofs, rem;
 977         int format;
 978         uchar *data, *last, *repl;
 979         Atom type;
 980
 981         ofs = 0;
 982         do {
 983                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 984                                         False, AnyPropertyType, &type, &format,
 985                                         &nitems, &rem, &data)) {
 986                         fprintf(stderr, "Clipboard allocation failed\n");
 987                         return;
 988                 }
 989
 990                 /*
 991                  * As seen in getsel:
 992                  * Line endings are inconsistent in the terminal and GUI world
 993                  * copy and pasting. When receiving some selection data,
 994                  * replace all '\n' with '\r'.
 995                  * FIXME: Fix the computer world.
 996                  */
 997                 repl = data;
 998                 last = data + nitems * format / 8;
 999                 while((repl = memchr(repl, '\n', last - repl))) {
1000                         *repl++ = '\r';
1001                 }
1002
1003                 if(IS_SET(MODE_BRCKTPASTE))
1004                         ttywrite("\033[200~", 6);
1005                 ttysend((char *)data, nitems * format / 8);
1006                 if(IS_SET(MODE_BRCKTPASTE))
1007                         ttywrite("\033[201~", 6);
1008                 XFree(data);
1009                 /* number of 32-bit chunks returned */
1010                 ofs += nitems * format / 32;
1011         } while(rem > 0);
1012 }
1013
1014 void
1015 selpaste(const Arg *dummy) {
1016         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1017                         xw.win, CurrentTime);
1018 }
1019
1020 void
1021 clippaste(const Arg *dummy) {
1022         Atom clipboard;
1023
1024         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1025         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1026                         xw.win, CurrentTime);
1027 }
1028
1029 void
1030 selclear(XEvent *e) {
1031         if(sel.ob.x == -1)
1032                 return;
1033         sel.ob.x = -1;
1034         tsetdirt(sel.nb.y, sel.ne.y);
1035 }
1036
1037 void
1038 selrequest(XEvent *e) {
1039         XSelectionRequestEvent *xsre;
1040         XSelectionEvent xev;
1041         Atom xa_targets, string;
1042
1043         xsre = (XSelectionRequestEvent *) e;
1044         xev.type = SelectionNotify;
1045         xev.requestor = xsre->requestor;
1046         xev.selection = xsre->selection;
1047         xev.target = xsre->target;
1048         xev.time = xsre->time;
1049         /* reject */
1050         xev.property = None;
1051
1052         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1053         if(xsre->target == xa_targets) {
1054                 /* respond with the supported type */
1055                 string = sel.xtarget;
1056                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1057                                 XA_ATOM, 32, PropModeReplace,
1058                                 (uchar *) &string, 1);
1059                 xev.property = xsre->property;
1060         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1061                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1062                                 xsre->target, 8, PropModeReplace,
1063                                 (uchar *) sel.clip, strlen(sel.clip));
1064                 xev.property = xsre->property;
1065         }
1066
1067         /* all done, send a notification to the listener */
1068         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1069                 fprintf(stderr, "Error sending SelectionNotify event\n");
1070 }
1071
1072 void
1073 xsetsel(char *str) {
1074         /* register the selection for both the clipboard and the primary */
1075         Atom clipboard;
1076
1077         free(sel.clip);
1078         sel.clip = str;
1079
1080         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1081
1082         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1083         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1084 }
1085
1086 void
1087 brelease(XEvent *e) {
1088         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1089                 mousereport(e);
1090                 return;
1091         }
1092
1093         if(e->xbutton.button == Button2) {
1094                 selpaste(NULL);
1095         } else if(e->xbutton.button == Button1) {
1096                 if(sel.mode < 2) {
1097                         selclear(NULL);
1098                 } else {
1099                         getbuttoninfo(e);
1100                         selcopy();
1101                 }
1102                 sel.mode = 0;
1103                 tsetdirt(sel.nb.y, sel.ne.y);
1104         }
1105 }
1106
1107 void
1108 bmotion(XEvent *e) {
1109         int oldey, oldex, oldsby, oldsey;
1110
1111         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1112                 mousereport(e);
1113                 return;
1114         }
1115
1116         if(!sel.mode)
1117                 return;
1118
1119         sel.mode++;
1120         oldey = sel.oe.y;
1121         oldex = sel.oe.x;
1122         oldsby = sel.nb.y;
1123         oldsey = sel.ne.y;
1124         getbuttoninfo(e);
1125
1126         if(oldey != sel.oe.y || oldex != sel.oe.x)
1127                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1128 }
1129
1130 void
1131 die(const char *errstr, ...) {
1132         va_list ap;
1133
1134         va_start(ap, errstr);
1135         vfprintf(stderr, errstr, ap);
1136         va_end(ap);
1137         exit(EXIT_FAILURE);
1138 }
1139
1140 void
1141 execsh(void) {
1142         char **args;
1143         char *envshell = getenv("SHELL");
1144         const struct passwd *pass = getpwuid(getuid());
1145         char buf[sizeof(long) * 8 + 1];
1146
1147         unsetenv("COLUMNS");
1148         unsetenv("LINES");
1149         unsetenv("TERMCAP");
1150
1151         if(pass) {
1152                 setenv("LOGNAME", pass->pw_name, 1);
1153                 setenv("USER", pass->pw_name, 1);
1154                 setenv("SHELL", pass->pw_shell, 0);
1155                 setenv("HOME", pass->pw_dir, 0);
1156         }
1157
1158         snprintf(buf, sizeof(buf), "%lu", xw.win);
1159         setenv("WINDOWID", buf, 1);
1160
1161         signal(SIGCHLD, SIG_DFL);
1162         signal(SIGHUP, SIG_DFL);
1163         signal(SIGINT, SIG_DFL);
1164         signal(SIGQUIT, SIG_DFL);
1165         signal(SIGTERM, SIG_DFL);
1166         signal(SIGALRM, SIG_DFL);
1167
1168         DEFAULT(envshell, shell);
1169         setenv("TERM", termname, 1);
1170         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1171         execvp(args[0], args);
1172         exit(EXIT_FAILURE);
1173 }
1174
1175 void
1176 sigchld(int a) {
1177         int stat, ret;
1178
1179         if(waitpid(pid, &stat, 0) < 0)
1180                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1181
1182         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1183         if (ret != EXIT_SUCCESS)
1184                 die("child finished with error '%d'\n", stat);
1185         exit(EXIT_SUCCESS);
1186 }
1187
1188 void
1189 ttynew(void) {
1190         int m, s;
1191         struct winsize w = {term.row, term.col, 0, 0};
1192
1193         /* seems to work fine on linux, openbsd and freebsd */
1194         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1195                 die("openpty failed: %s\n", strerror(errno));
1196
1197         switch(pid = fork()) {
1198         case -1:
1199                 die("fork failed\n");
1200                 break;
1201         case 0:
1202                 setsid(); /* create a new process group */
1203                 dup2(s, STDIN_FILENO);
1204                 dup2(s, STDOUT_FILENO);
1205                 dup2(s, STDERR_FILENO);
1206                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1207                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1208                 close(s);
1209                 close(m);
1210                 execsh();
1211                 break;
1212         default:
1213                 close(s);
1214                 cmdfd = m;
1215                 signal(SIGCHLD, sigchld);
1216                 if(opt_io) {
1217                         term.mode |= MODE_PRINT;
1218                         iofd = (!strcmp(opt_io, "-")) ?
1219                                   STDOUT_FILENO :
1220                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1221                         if(iofd < 0) {
1222                                 fprintf(stderr, "Error opening %s:%s\n",
1223                                         opt_io, strerror(errno));
1224                         }
1225                 }
1226                 break;
1227         }
1228 }
1229
1230 void
1231 ttyread(void) {
1232         static char buf[BUFSIZ];
1233         static int buflen = 0;
1234         char *ptr;
1235         char s[UTF_SIZ];
1236         int charsize; /* size of utf8 char in bytes */
1237         long unicodep;
1238         int ret;
1239
1240         /* append read bytes to unprocessed bytes */
1241         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1242                 die("Couldn't read from shell: %s\n", strerror(errno));
1243
1244         /* process every complete utf8 char */
1245         buflen += ret;
1246         ptr = buf;
1247         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1248                 utf8encode(unicodep, s, UTF_SIZ);
1249                 tputc(s, charsize);
1250                 ptr += charsize;
1251                 buflen -= charsize;
1252         }
1253
1254         /* keep any uncomplete utf8 char for the next call */
1255         memmove(buf, ptr, buflen);
1256 }
1257
1258 void
1259 ttywrite(const char *s, size_t n) {
1260         if(xwrite(cmdfd, s, n) == -1)
1261                 die("write error on tty: %s\n", strerror(errno));
1262 }
1263
1264 void
1265 ttysend(char *s, size_t n) {
1266         ttywrite(s, n);
1267         if(IS_SET(MODE_ECHO))
1268                 techo(s, n);
1269 }
1270
1271 void
1272 ttyresize(void) {
1273         struct winsize w;
1274
1275         w.ws_row = term.row;
1276         w.ws_col = term.col;
1277         w.ws_xpixel = xw.tw;
1278         w.ws_ypixel = xw.th;
1279         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1280                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1281 }
1282
1283 int
1284 tattrset(int attr) {
1285         int i, j;
1286
1287         for(i = 0; i < term.row-1; i++) {
1288                 for(j = 0; j < term.col-1; j++) {
1289                         if(term.line[i][j].mode & attr)
1290                                 return 1;
1291                 }
1292         }
1293
1294         return 0;
1295 }
1296
1297 void
1298 tsetdirt(int top, int bot) {
1299         int i;
1300
1301         LIMIT(top, 0, term.row-1);
1302         LIMIT(bot, 0, term.row-1);
1303
1304         for(i = top; i <= bot; i++)
1305                 term.dirty[i] = 1;
1306 }
1307
1308 void
1309 tsetdirtattr(int attr) {
1310         int i, j;
1311
1312         for(i = 0; i < term.row-1; i++) {
1313                 for(j = 0; j < term.col-1; j++) {
1314                         if(term.line[i][j].mode & attr) {
1315                                 tsetdirt(i, i);
1316                                 break;
1317                         }
1318                 }
1319         }
1320 }
1321
1322 void
1323 tfulldirt(void) {
1324         tsetdirt(0, term.row-1);
1325 }
1326
1327 void
1328 tcursor(int mode) {
1329         static TCursor c[2];
1330         bool alt = IS_SET(MODE_ALTSCREEN);
1331
1332         if(mode == CURSOR_SAVE) {
1333                 c[alt] = term.c;
1334         } else if(mode == CURSOR_LOAD) {
1335                 term.c = c[alt];
1336                 tmoveto(c[alt].x, c[alt].y);
1337         }
1338 }
1339
1340 void
1341 treset(void) {
1342         uint i;
1343
1344         term.c = (TCursor){{
1345                 .mode = ATTR_NULL,
1346                 .fg = defaultfg,
1347                 .bg = defaultbg
1348         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1349
1350         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1351         for(i = tabspaces; i < term.col; i += tabspaces)
1352                 term.tabs[i] = 1;
1353         term.top = 0;
1354         term.bot = term.row - 1;
1355         term.mode = MODE_WRAP;
1356         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1357         term.charset = 0;
1358
1359         tclearregion(0, 0, term.col-1, term.row-1);
1360         tmoveto(0, 0);
1361         tcursor(CURSOR_SAVE);
1362 }
1363
1364 void
1365 tnew(int col, int row) {
1366         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1367         tresize(col, row);
1368         term.numlock = 1;
1369
1370         treset();
1371 }
1372
1373 void
1374 tswapscreen(void) {
1375         Line *tmp = term.line;
1376
1377         term.line = term.alt;
1378         term.alt = tmp;
1379         term.mode ^= MODE_ALTSCREEN;
1380         tfulldirt();
1381 }
1382
1383 void
1384 tscrolldown(int orig, int n) {
1385         int i;
1386         Line temp;
1387
1388         LIMIT(n, 0, term.bot-orig+1);
1389
1390         tsetdirt(orig, term.bot-n);
1391         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1392
1393         for(i = term.bot; i >= orig+n; i--) {
1394                 temp = term.line[i];
1395                 term.line[i] = term.line[i-n];
1396                 term.line[i-n] = temp;
1397         }
1398
1399         selscroll(orig, n);
1400 }
1401
1402 void
1403 tscrollup(int orig, int n) {
1404         int i;
1405         Line temp;
1406
1407         LIMIT(n, 0, term.bot-orig+1);
1408
1409         tclearregion(0, orig, term.col-1, orig+n-1);
1410         tsetdirt(orig+n, term.bot);
1411
1412         for(i = orig; i <= term.bot-n; i++) {
1413                 temp = term.line[i];
1414                 term.line[i] = term.line[i+n];
1415                 term.line[i+n] = temp;
1416         }
1417
1418         selscroll(orig, -n);
1419 }
1420
1421 void
1422 selscroll(int orig, int n) {
1423         if(sel.ob.x == -1)
1424                 return;
1425
1426         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1427                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1428                         selclear(NULL);
1429                         return;
1430                 }
1431                 if(sel.type == SEL_RECTANGULAR) {
1432                         if(sel.ob.y < term.top)
1433                                 sel.ob.y = term.top;
1434                         if(sel.oe.y > term.bot)
1435                                 sel.oe.y = term.bot;
1436                 } else {
1437                         if(sel.ob.y < term.top) {
1438                                 sel.ob.y = term.top;
1439                                 sel.ob.x = 0;
1440                         }
1441                         if(sel.oe.y > term.bot) {
1442                                 sel.oe.y = term.bot;
1443                                 sel.oe.x = term.col;
1444                         }
1445                 }
1446                 selnormalize();
1447         }
1448 }
1449
1450 void
1451 tnewline(int first_col) {
1452         int y = term.c.y;
1453
1454         if(y == term.bot) {
1455                 tscrollup(term.top, 1);
1456         } else {
1457                 y++;
1458         }
1459         tmoveto(first_col ? 0 : term.c.x, y);
1460 }
1461
1462 void
1463 csiparse(void) {
1464         char *p = csiescseq.buf, *np;
1465         long int v;
1466
1467         csiescseq.narg = 0;
1468         if(*p == '?') {
1469                 csiescseq.priv = 1;
1470                 p++;
1471         }
1472
1473         csiescseq.buf[csiescseq.len] = '\0';
1474         while(p < csiescseq.buf+csiescseq.len) {
1475                 np = NULL;
1476                 v = strtol(p, &np, 10);
1477                 if(np == p)
1478                         v = 0;
1479                 if(v == LONG_MAX || v == LONG_MIN)
1480                         v = -1;
1481                 csiescseq.arg[csiescseq.narg++] = v;
1482                 p = np;
1483                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1484                         break;
1485                 p++;
1486         }
1487         csiescseq.mode = *p;
1488 }
1489
1490 /* for absolute user moves, when decom is set */
1491 void
1492 tmoveato(int x, int y) {
1493         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1494 }
1495
1496 void
1497 tmoveto(int x, int y) {
1498         int miny, maxy;
1499
1500         if(term.c.state & CURSOR_ORIGIN) {
1501                 miny = term.top;
1502                 maxy = term.bot;
1503         } else {
1504                 miny = 0;
1505                 maxy = term.row - 1;
1506         }
1507         LIMIT(x, 0, term.col-1);
1508         LIMIT(y, miny, maxy);
1509         term.c.state &= ~CURSOR_WRAPNEXT;
1510         term.c.x = x;
1511         term.c.y = y;
1512 }
1513
1514 void
1515 tsetchar(char *c, Glyph *attr, int x, int y) {
1516         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1517                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1518                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1519                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1520                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1521                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1522                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1523                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1524                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1525         };
1526
1527         /*
1528          * The table is proudly stolen from rxvt.
1529          */
1530         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1531                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1532                         c = vt100_0[c[0] - 0x41];
1533                 }
1534         }
1535
1536         if(term.line[y][x].mode & ATTR_WIDE) {
1537                 if(x+1 < term.col) {
1538                         term.line[y][x+1].c[0] = ' ';
1539                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1540                 }
1541         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1542                 term.line[y][x-1].c[0] = ' ';
1543                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1544         }
1545
1546         term.dirty[y] = 1;
1547         term.line[y][x] = *attr;
1548         memcpy(term.line[y][x].c, c, UTF_SIZ);
1549 }
1550
1551 void
1552 tclearregion(int x1, int y1, int x2, int y2) {
1553         int x, y, temp;
1554         Glyph *gp;
1555
1556         if(x1 > x2)
1557                 temp = x1, x1 = x2, x2 = temp;
1558         if(y1 > y2)
1559                 temp = y1, y1 = y2, y2 = temp;
1560
1561         LIMIT(x1, 0, term.col-1);
1562         LIMIT(x2, 0, term.col-1);
1563         LIMIT(y1, 0, term.row-1);
1564         LIMIT(y2, 0, term.row-1);
1565
1566         for(y = y1; y <= y2; y++) {
1567                 term.dirty[y] = 1;
1568                 for(x = x1; x <= x2; x++) {
1569                         gp = &term.line[y][x];
1570                         if(selected(x, y))
1571                                 selclear(NULL);
1572                         gp->fg = term.c.attr.fg;
1573                         gp->bg = term.c.attr.bg;
1574                         gp->mode = 0;
1575                         memcpy(gp->c, " ", 2);
1576                 }
1577         }
1578 }
1579
1580 void
1581 tdeletechar(int n) {
1582         int dst, src, size;
1583         Glyph *line;
1584
1585         LIMIT(n, 0, term.col - term.c.x);
1586
1587         dst = term.c.x;
1588         src = term.c.x + n;
1589         size = term.col - src;
1590         line = term.line[term.c.y];
1591
1592         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1593         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1594 }
1595
1596 void
1597 tinsertblank(int n) {
1598         int dst, src, size;
1599         Glyph *line;
1600
1601         LIMIT(n, 0, term.col - term.c.x);
1602
1603         dst = term.c.x + n;
1604         src = term.c.x;
1605         size = term.col - dst;
1606         line = term.line[term.c.y];
1607
1608         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1609         tclearregion(src, term.c.y, dst - 1, term.c.y);
1610 }
1611
1612 void
1613 tinsertblankline(int n) {
1614         if(BETWEEN(term.c.y, term.top, term.bot))
1615                 tscrolldown(term.c.y, n);
1616 }
1617
1618 void
1619 tdeleteline(int n) {
1620         if(BETWEEN(term.c.y, term.top, term.bot))
1621                 tscrollup(term.c.y, n);
1622 }
1623
1624 int32_t
1625 tdefcolor(int *attr, int *npar, int l) {
1626         int32_t idx = -1;
1627         uint r, g, b;
1628
1629         switch (attr[*npar + 1]) {
1630         case 2: /* direct color in RGB space */
1631                 if (*npar + 4 >= l) {
1632                         fprintf(stderr,
1633                                 "erresc(38): Incorrect number of parameters (%d)\n",
1634                                 *npar);
1635                         break;
1636                 }
1637                 r = attr[*npar + 2];
1638                 g = attr[*npar + 3];
1639                 b = attr[*npar + 4];
1640                 *npar += 4;
1641                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1642                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1643                                 r, g, b);
1644                 else
1645                         idx = TRUECOLOR(r, g, b);
1646                 break;
1647         case 5: /* indexed color */
1648                 if (*npar + 2 >= l) {
1649                         fprintf(stderr,
1650                                 "erresc(38): Incorrect number of parameters (%d)\n",
1651                                 *npar);
1652                         break;
1653                 }
1654                 *npar += 2;
1655                 if(!BETWEEN(attr[*npar], 0, 255))
1656                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1657                 else
1658                         idx = attr[*npar];
1659                 break;
1660         case 0: /* implemented defined (only foreground) */
1661         case 1: /* transparent */
1662         case 3: /* direct color in CMY space */
1663         case 4: /* direct color in CMYK space */
1664         default:
1665                 fprintf(stderr,
1666                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1667                 break;
1668         }
1669
1670         return idx;
1671 }
1672
1673 void
1674 tsetattr(int *attr, int l) {
1675         int i;
1676         int32_t idx;
1677
1678         for(i = 0; i < l; i++) {
1679                 switch(attr[i]) {
1680                 case 0:
1681                         term.c.attr.mode &= ~(
1682                                 ATTR_BOLD       |
1683                                 ATTR_FAINT      |
1684                                 ATTR_ITALIC     |
1685                                 ATTR_UNDERLINE  |
1686                                 ATTR_BLINK      |
1687                                 ATTR_REVERSE    |
1688                                 ATTR_INVISIBLE  |
1689                                 ATTR_STRUCK     );
1690                         term.c.attr.fg = defaultfg;
1691                         term.c.attr.bg = defaultbg;
1692                         break;
1693                 case 1:
1694                         term.c.attr.mode |= ATTR_BOLD;
1695                         break;
1696                 case 2:
1697                         term.c.attr.mode |= ATTR_FAINT;
1698                         break;
1699                 case 3:
1700                         term.c.attr.mode |= ATTR_ITALIC;
1701                         break;
1702                 case 4:
1703                         term.c.attr.mode |= ATTR_UNDERLINE;
1704                         break;
1705                 case 5: /* slow blink */
1706                         /* FALLTHROUGH */
1707                 case 6: /* rapid blink */
1708                         term.c.attr.mode |= ATTR_BLINK;
1709                         break;
1710                 case 7:
1711                         term.c.attr.mode |= ATTR_REVERSE;
1712                         break;
1713                 case 8:
1714                         term.c.attr.mode |= ATTR_INVISIBLE;
1715                         break;
1716                 case 9:
1717                         term.c.attr.mode |= ATTR_STRUCK;
1718                         break;
1719                 case 22:
1720                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1721                         break;
1722                 case 23:
1723                         term.c.attr.mode &= ~ATTR_ITALIC;
1724                         break;
1725                 case 24:
1726                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1727                         break;
1728                 case 25:
1729                         term.c.attr.mode &= ~ATTR_BLINK;
1730                         break;
1731                 case 27:
1732                         term.c.attr.mode &= ~ATTR_REVERSE;
1733                         break;
1734                 case 28:
1735                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1736                         break;
1737                 case 29:
1738                         term.c.attr.mode &= ~ATTR_STRUCK;
1739                         break;
1740                 case 38:
1741                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1742                                 term.c.attr.fg = idx;
1743                         break;
1744                 case 39:
1745                         term.c.attr.fg = defaultfg;
1746                         break;
1747                 case 48:
1748                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1749                                 term.c.attr.bg = idx;
1750                         break;
1751                 case 49:
1752                         term.c.attr.bg = defaultbg;
1753                         break;
1754                 default:
1755                         if(BETWEEN(attr[i], 30, 37)) {
1756                                 term.c.attr.fg = attr[i] - 30;
1757                         } else if(BETWEEN(attr[i], 40, 47)) {
1758                                 term.c.attr.bg = attr[i] - 40;
1759                         } else if(BETWEEN(attr[i], 90, 97)) {
1760                                 term.c.attr.fg = attr[i] - 90 + 8;
1761                         } else if(BETWEEN(attr[i], 100, 107)) {
1762                                 term.c.attr.bg = attr[i] - 100 + 8;
1763                         } else {
1764                                 fprintf(stderr,
1765                                         "erresc(default): gfx attr %d unknown\n",
1766                                         attr[i]), csidump();
1767                         }
1768                         break;
1769                 }
1770         }
1771 }
1772
1773 void
1774 tsetscroll(int t, int b) {
1775         int temp;
1776
1777         LIMIT(t, 0, term.row-1);
1778         LIMIT(b, 0, term.row-1);
1779         if(t > b) {
1780                 temp = t;
1781                 t = b;
1782                 b = temp;
1783         }
1784         term.top = t;
1785         term.bot = b;
1786 }
1787
1788 void
1789 tsetmode(bool priv, bool set, int *args, int narg) {
1790         int *lim, mode;
1791         bool alt;
1792
1793         for(lim = args + narg; args < lim; ++args) {
1794                 if(priv) {
1795                         switch(*args) {
1796                         case 1: /* DECCKM -- Cursor key */
1797                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1798                                 break;
1799                         case 5: /* DECSCNM -- Reverse video */
1800                                 mode = term.mode;
1801                                 MODBIT(term.mode, set, MODE_REVERSE);
1802                                 if(mode != term.mode)
1803                                         redraw(REDRAW_TIMEOUT);
1804                                 break;
1805                         case 6: /* DECOM -- Origin */
1806                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1807                                 tmoveato(0, 0);
1808                                 break;
1809                         case 7: /* DECAWM -- Auto wrap */
1810                                 MODBIT(term.mode, set, MODE_WRAP);
1811                                 break;
1812                         case 0:  /* Error (IGNORED) */
1813                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1814                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1815                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1816                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1817                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1818                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1819                         case 42: /* DECNRCM -- National characters (IGNORED) */
1820                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1821                                 break;
1822                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1823                                 MODBIT(term.mode, !set, MODE_HIDE);
1824                                 break;
1825                         case 9:    /* X10 mouse compatibility mode */
1826                                 xsetpointermotion(0);
1827                                 MODBIT(term.mode, 0, MODE_MOUSE);
1828                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1829                                 break;
1830                         case 1000: /* 1000: report button press */
1831                                 xsetpointermotion(0);
1832                                 MODBIT(term.mode, 0, MODE_MOUSE);
1833                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1834                                 break;
1835                         case 1002: /* 1002: report motion on button press */
1836                                 xsetpointermotion(0);
1837                                 MODBIT(term.mode, 0, MODE_MOUSE);
1838                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1839                                 break;
1840                         case 1003: /* 1003: enable all mouse motions */
1841                                 xsetpointermotion(set);
1842                                 MODBIT(term.mode, 0, MODE_MOUSE);
1843                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1844                                 break;
1845                         case 1004: /* 1004: send focus events to tty */
1846                                 MODBIT(term.mode, set, MODE_FOCUS);
1847                                 break;
1848                         case 1006: /* 1006: extended reporting mode */
1849                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1850                                 break;
1851                         case 1034:
1852                                 MODBIT(term.mode, set, MODE_8BIT);
1853                                 break;
1854                         case 1049: /* swap screen & set/restore cursor as xterm */
1855                                 if (!allowaltscreen)
1856                                         break;
1857                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1858                                 /* FALLTHROUGH */
1859                         case 47: /* swap screen */
1860                         case 1047:
1861                                 if (!allowaltscreen)
1862                                         break;
1863                                 alt = IS_SET(MODE_ALTSCREEN);
1864                                 if(alt) {
1865                                         tclearregion(0, 0, term.col-1,
1866                                                         term.row-1);
1867                                 }
1868                                 if(set ^ alt) /* set is always 1 or 0 */
1869                                         tswapscreen();
1870                                 if(*args != 1049)
1871                                         break;
1872                                 /* FALLTHROUGH */
1873                         case 1048:
1874                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1875                                 break;
1876                         case 2004: /* 2004: bracketed paste mode */
1877                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1878                                 break;
1879                         /* Not implemented mouse modes. See comments there. */
1880                         case 1001: /* mouse highlight mode; can hang the
1881                                       terminal by design when implemented. */
1882                         case 1005: /* UTF-8 mouse mode; will confuse
1883                                       applications not supporting UTF-8
1884                                       and luit. */
1885                         case 1015: /* urxvt mangled mouse mode; incompatible
1886                                       and can be mistaken for other control
1887                                       codes. */
1888                         default:
1889                                 fprintf(stderr,
1890                                         "erresc: unknown private set/reset mode %d\n",
1891                                         *args);
1892                                 break;
1893                         }
1894                 } else {
1895                         switch(*args) {
1896                         case 0:  /* Error (IGNORED) */
1897                                 break;
1898                         case 2:  /* KAM -- keyboard action */
1899                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1900                                 break;
1901                         case 4:  /* IRM -- Insertion-replacement */
1902                                 MODBIT(term.mode, set, MODE_INSERT);
1903                                 break;
1904                         case 12: /* SRM -- Send/Receive */
1905                                 MODBIT(term.mode, !set, MODE_ECHO);
1906                                 break;
1907                         case 20: /* LNM -- Linefeed/new line */
1908                                 MODBIT(term.mode, set, MODE_CRLF);
1909                                 break;
1910                         default:
1911                                 fprintf(stderr,
1912                                         "erresc: unknown set/reset mode %d\n",
1913                                         *args);
1914                                 break;
1915                         }
1916                 }
1917         }
1918 }
1919
1920 void
1921 csihandle(void) {
1922         char buf[40];
1923         int len;
1924
1925         switch(csiescseq.mode) {
1926         default:
1927         unknown:
1928                 fprintf(stderr, "erresc: unknown csi ");
1929                 csidump();
1930                 /* die(""); */
1931                 break;
1932         case '@': /* ICH -- Insert <n> blank char */
1933                 DEFAULT(csiescseq.arg[0], 1);
1934                 tinsertblank(csiescseq.arg[0]);
1935                 break;
1936         case 'A': /* CUU -- Cursor <n> Up */
1937                 DEFAULT(csiescseq.arg[0], 1);
1938                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1939                 break;
1940         case 'B': /* CUD -- Cursor <n> Down */
1941         case 'e': /* VPR --Cursor <n> Down */
1942                 DEFAULT(csiescseq.arg[0], 1);
1943                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1944                 break;
1945         case 'i': /* MC -- Media Copy */
1946                 switch(csiescseq.arg[0]) {
1947                 case 0:
1948                         tdump();
1949                         break;
1950                 case 1:
1951                         tdumpline(term.c.y);
1952                         break;
1953                 case 2:
1954                         tdumpsel();
1955                         break;
1956                 case 4:
1957                         term.mode &= ~MODE_PRINT;
1958                         break;
1959                 case 5:
1960                         term.mode |= MODE_PRINT;
1961                         break;
1962                 }
1963                 break;
1964         case 'c': /* DA -- Device Attributes */
1965                 if(csiescseq.arg[0] == 0)
1966                         ttywrite(vtiden, sizeof(vtiden) - 1);
1967                 break;
1968         case 'C': /* CUF -- Cursor <n> Forward */
1969         case 'a': /* HPR -- Cursor <n> Forward */
1970                 DEFAULT(csiescseq.arg[0], 1);
1971                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1972                 break;
1973         case 'D': /* CUB -- Cursor <n> Backward */
1974                 DEFAULT(csiescseq.arg[0], 1);
1975                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1976                 break;
1977         case 'E': /* CNL -- Cursor <n> Down and first col */
1978                 DEFAULT(csiescseq.arg[0], 1);
1979                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1980                 break;
1981         case 'F': /* CPL -- Cursor <n> Up and first col */
1982                 DEFAULT(csiescseq.arg[0], 1);
1983                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1984                 break;
1985         case 'g': /* TBC -- Tabulation clear */
1986                 switch(csiescseq.arg[0]) {
1987                 case 0: /* clear current tab stop */
1988                         term.tabs[term.c.x] = 0;
1989                         break;
1990                 case 3: /* clear all the tabs */
1991                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1992                         break;
1993                 default:
1994                         goto unknown;
1995                 }
1996                 break;
1997         case 'G': /* CHA -- Move to <col> */
1998         case '`': /* HPA */
1999                 DEFAULT(csiescseq.arg[0], 1);
2000                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2001                 break;
2002         case 'H': /* CUP -- Move to <row> <col> */
2003         case 'f': /* HVP */
2004                 DEFAULT(csiescseq.arg[0], 1);
2005                 DEFAULT(csiescseq.arg[1], 1);
2006                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2007                 break;
2008         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2009                 DEFAULT(csiescseq.arg[0], 1);
2010                 tputtab(csiescseq.arg[0]);
2011                 break;
2012         case 'J': /* ED -- Clear screen */
2013                 selclear(NULL);
2014                 switch(csiescseq.arg[0]) {
2015                 case 0: /* below */
2016                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2017                         if(term.c.y < term.row-1) {
2018                                 tclearregion(0, term.c.y+1, term.col-1,
2019                                                 term.row-1);
2020                         }
2021                         break;
2022                 case 1: /* above */
2023                         if(term.c.y > 1)
2024                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2025                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2026                         break;
2027                 case 2: /* all */
2028                         tclearregion(0, 0, term.col-1, term.row-1);
2029                         break;
2030                 default:
2031                         goto unknown;
2032                 }
2033                 break;
2034         case 'K': /* EL -- Clear line */
2035                 switch(csiescseq.arg[0]) {
2036                 case 0: /* right */
2037                         tclearregion(term.c.x, term.c.y, term.col-1,
2038                                         term.c.y);
2039                         break;
2040                 case 1: /* left */
2041                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2042                         break;
2043                 case 2: /* all */
2044                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2045                         break;
2046                 }
2047                 break;
2048         case 'S': /* SU -- Scroll <n> line up */
2049                 DEFAULT(csiescseq.arg[0], 1);
2050                 tscrollup(term.top, csiescseq.arg[0]);
2051                 break;
2052         case 'T': /* SD -- Scroll <n> line down */
2053                 DEFAULT(csiescseq.arg[0], 1);
2054                 tscrolldown(term.top, csiescseq.arg[0]);
2055                 break;
2056         case 'L': /* IL -- Insert <n> blank lines */
2057                 DEFAULT(csiescseq.arg[0], 1);
2058                 tinsertblankline(csiescseq.arg[0]);
2059                 break;
2060         case 'l': /* RM -- Reset Mode */
2061                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2062                 break;
2063         case 'M': /* DL -- Delete <n> lines */
2064                 DEFAULT(csiescseq.arg[0], 1);
2065                 tdeleteline(csiescseq.arg[0]);
2066                 break;
2067         case 'X': /* ECH -- Erase <n> char */
2068                 DEFAULT(csiescseq.arg[0], 1);
2069                 tclearregion(term.c.x, term.c.y,
2070                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2071                 break;
2072         case 'P': /* DCH -- Delete <n> char */
2073                 DEFAULT(csiescseq.arg[0], 1);
2074                 tdeletechar(csiescseq.arg[0]);
2075                 break;
2076         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2077                 DEFAULT(csiescseq.arg[0], 1);
2078                 tputtab(-csiescseq.arg[0]);
2079                 break;
2080         case 'd': /* VPA -- Move to <row> */
2081                 DEFAULT(csiescseq.arg[0], 1);
2082                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2083                 break;
2084         case 'h': /* SM -- Set terminal mode */
2085                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2086                 break;
2087         case 'm': /* SGR -- Terminal attribute (color) */
2088                 tsetattr(csiescseq.arg, csiescseq.narg);
2089                 break;
2090         case 'n': /* DSR – Device Status Report (cursor position) */
2091                 if (csiescseq.arg[0] == 6) {
2092                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2093                                         term.c.y+1, term.c.x+1);
2094                         ttywrite(buf, len);
2095                 }
2096                 break;
2097         case 'r': /* DECSTBM -- Set Scrolling Region */
2098                 if(csiescseq.priv) {
2099                         goto unknown;
2100                 } else {
2101                         DEFAULT(csiescseq.arg[0], 1);
2102                         DEFAULT(csiescseq.arg[1], term.row);
2103                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2104                         tmoveato(0, 0);
2105                 }
2106                 break;
2107         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2108                 tcursor(CURSOR_SAVE);
2109                 break;
2110         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2111                 tcursor(CURSOR_LOAD);
2112                 break;
2113         }
2114 }
2115
2116 void
2117 csidump(void) {
2118         int i;
2119         uint c;
2120
2121         printf("ESC[");
2122         for(i = 0; i < csiescseq.len; i++) {
2123                 c = csiescseq.buf[i] & 0xff;
2124                 if(isprint(c)) {
2125                         putchar(c);
2126                 } else if(c == '\n') {
2127                         printf("(\\n)");
2128                 } else if(c == '\r') {
2129                         printf("(\\r)");
2130                 } else if(c == 0x1b) {
2131                         printf("(\\e)");
2132                 } else {
2133                         printf("(%02x)", c);
2134                 }
2135         }
2136         putchar('\n');
2137 }
2138
2139 void
2140 csireset(void) {
2141         memset(&csiescseq, 0, sizeof(csiescseq));
2142 }
2143
2144 void
2145 strhandle(void) {
2146         char *p = NULL;
2147         int j, narg, par;
2148
2149         term.esc &= ~(ESC_STR_END|ESC_STR);
2150         strparse();
2151         narg = strescseq.narg;
2152         par = atoi(strescseq.args[0]);
2153
2154         switch(strescseq.type) {
2155         case ']': /* OSC -- Operating System Command */
2156                 switch(par) {
2157                 case 0:
2158                 case 1:
2159                 case 2:
2160                         if(narg > 1)
2161                                 xsettitle(strescseq.args[1]);
2162                         return;
2163                 case 4: /* color set */
2164                         if(narg < 3)
2165                                 break;
2166                         p = strescseq.args[2];
2167                         /* FALLTHROUGH */
2168                 case 104: /* color reset, here p = NULL */
2169                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2170                         if(xsetcolorname(j, p)) {
2171                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2172                         } else {
2173                                 /*
2174                                  * TODO if defaultbg color is changed, borders
2175                                  * are dirty
2176                                  */
2177                                 redraw(0);
2178                         }
2179                         return;
2180                 }
2181                 break;
2182         case 'k': /* old title set compatibility */
2183                 xsettitle(strescseq.args[0]);
2184                 return;
2185         case 'P': /* DCS -- Device Control String */
2186         case '_': /* APC -- Application Program Command */
2187         case '^': /* PM -- Privacy Message */
2188                 return;
2189         }
2190
2191         fprintf(stderr, "erresc: unknown str ");
2192         strdump();
2193 }
2194
2195 void
2196 strparse(void) {
2197         char *p = strescseq.buf;
2198
2199         strescseq.narg = 0;
2200         strescseq.buf[strescseq.len] = '\0';
2201         while(p && strescseq.narg < STR_ARG_SIZ)
2202                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2203 }
2204
2205 void
2206 strdump(void) {
2207         int i;
2208         uint c;
2209
2210         printf("ESC%c", strescseq.type);
2211         for(i = 0; i < strescseq.len; i++) {
2212                 c = strescseq.buf[i] & 0xff;
2213                 if(c == '\0') {
2214                         return;
2215                 } else if(isprint(c)) {
2216                         putchar(c);
2217                 } else if(c == '\n') {
2218                         printf("(\\n)");
2219                 } else if(c == '\r') {
2220                         printf("(\\r)");
2221                 } else if(c == 0x1b) {
2222                         printf("(\\e)");
2223                 } else {
2224                         printf("(%02x)", c);
2225                 }
2226         }
2227         printf("ESC\\\n");
2228 }
2229
2230 void
2231 strreset(void) {
2232         memset(&strescseq, 0, sizeof(strescseq));
2233 }
2234
2235 void
2236 tprinter(char *s, size_t len) {
2237         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2238                 fprintf(stderr, "Error writing in %s:%s\n",
2239                         opt_io, strerror(errno));
2240                 close(iofd);
2241                 iofd = -1;
2242         }
2243 }
2244
2245 void
2246 toggleprinter(const Arg *arg) {
2247         term.mode ^= MODE_PRINT;
2248 }
2249
2250 void
2251 printscreen(const Arg *arg) {
2252         tdump();
2253 }
2254
2255 void
2256 printsel(const Arg *arg) {
2257         tdumpsel();
2258 }
2259
2260 void
2261 tdumpsel(void) {
2262         char *ptr;
2263
2264         if((ptr = getsel())) {
2265                 tprinter(ptr, strlen(ptr));
2266                 free(ptr);
2267         }
2268 }
2269
2270 void
2271 tdumpline(int n) {
2272         Glyph *bp, *end;
2273
2274         bp = &term.line[n][0];
2275         end = &bp[MIN(tlinelen(n), term.col) - 1];
2276         if(bp != end || bp->c[0] != ' ') {
2277                 for( ;bp <= end; ++bp)
2278                         tprinter(bp->c, utf8len(bp->c));
2279         }
2280         tprinter("\n", 1);
2281 }
2282
2283 void
2284 tdump(void) {
2285         int i;
2286
2287         for(i = 0; i < term.row; ++i)
2288                 tdumpline(i);
2289 }
2290
2291 void
2292 tputtab(int n) {
2293         uint x = term.c.x;
2294
2295         if(n > 0) {
2296                 while(x < term.col && n--)
2297                         for(++x; x < term.col && !term.tabs[x]; ++x)
2298                                 /* nothing */ ;
2299         } else if(n < 0) {
2300                 while(x > 0 && n++)
2301                         for(--x; x > 0 && !term.tabs[x]; --x)
2302                                 /* nothing */ ;
2303         }
2304         tmoveto(x, term.c.y);
2305 }
2306
2307 void
2308 techo(char *buf, int len) {
2309         for(; len > 0; buf++, len--) {
2310                 char c = *buf;
2311
2312                 if(ISCONTROL((uchar) c)) { /* control code */
2313                         if(c & 0x80) {
2314                                 c &= 0x7f;
2315                                 tputc("^", 1);
2316                                 tputc("[", 1);
2317                         } else if(c != '\n' && c != '\r' && c != '\t') {
2318                                 c ^= 0x40;
2319                                 tputc("^", 1);
2320                         }
2321                         tputc(&c, 1);
2322                 } else {
2323                         break;
2324                 }
2325         }
2326         if(len)
2327                 tputc(buf, len);
2328 }
2329
2330 void
2331 tdeftran(char ascii) {
2332         static char cs[] = "0B";
2333         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2334         char *p;
2335
2336         if((p = strchr(cs, ascii)) == NULL) {
2337                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2338         } else {
2339                 term.trantbl[term.icharset] = vcs[p - cs];
2340         }
2341 }
2342
2343 void
2344 tstrsequence(uchar c) {
2345         if (c & 0x80) {
2346                 switch (c) {
2347                 case 0x90:   /* DCS -- Device Control String */
2348                         c = 'P';
2349                         break;
2350                 case 0x9f:   /* APC -- Application Program Command */
2351                         c = '_';
2352                         break;
2353                 case 0x9e:   /* PM -- Privacy Message */
2354                         c = '^';
2355                         break;
2356                 case 0x9d:   /* OSC -- Operating System Command */
2357                         c = ']';
2358                         break;
2359                 }
2360         }
2361         strreset();
2362         strescseq.type = c;
2363         term.esc |= ESC_STR;
2364         return;
2365 }
2366
2367 void
2368 tcontrolcode(uchar ascii) {
2369         static char question[UTF_SIZ] = "?";
2370
2371         switch(ascii) {
2372         case '\t':   /* HT */
2373                 tputtab(1);
2374                 return;
2375         case '\b':   /* BS */
2376                 tmoveto(term.c.x-1, term.c.y);
2377                 return;
2378         case '\r':   /* CR */
2379                 tmoveto(0, term.c.y);
2380                 return;
2381         case '\f':   /* LF */
2382         case '\v':   /* VT */
2383         case '\n':   /* LF */
2384                 /* go to first col if the mode is set */
2385                 tnewline(IS_SET(MODE_CRLF));
2386                 return;
2387         case '\a':   /* BEL */
2388                 if(term.esc & ESC_STR_END) {
2389                         /* backwards compatibility to xterm */
2390                         strhandle();
2391                 } else {
2392                         if(!(xw.state & WIN_FOCUSED))
2393                                 xseturgency(1);
2394                         if (bellvolume)
2395                                 XBell(xw.dpy, bellvolume);
2396                 }
2397                 break;
2398         case '\033': /* ESC */
2399                 csireset();
2400                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2401                 term.esc |= ESC_START;
2402                 return;
2403         case '\016': /* SO */
2404                 term.charset = 0;
2405                 return;
2406         case '\017': /* SI */
2407                 term.charset = 1;
2408                 return;
2409         case '\032': /* SUB */
2410                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2411         case '\030': /* CAN */
2412                 csireset();
2413                 break;
2414         case '\005': /* ENQ (IGNORED) */
2415         case '\000': /* NUL (IGNORED) */
2416         case '\021': /* XON (IGNORED) */
2417         case '\023': /* XOFF (IGNORED) */
2418         case 0177:   /* DEL (IGNORED) */
2419                 return;
2420         case 0x84:   /* TODO: IND */
2421                 break;
2422         case 0x85:   /* NEL -- Next line */
2423                 tnewline(1); /* always go to first col */
2424                 break;
2425         case 0x88:   /* HTS -- Horizontal tab stop */
2426                 term.tabs[term.c.x] = 1;
2427                 break;
2428         case 0x8d:   /* TODO: RI */
2429         case 0x8e:   /* TODO: SS2 */
2430         case 0x8f:   /* TODO: SS3 */
2431         case 0x98:   /* TODO: SOS */
2432                 break;
2433         case 0x9a:   /* DECID -- Identify Terminal */
2434                 ttywrite(vtiden, sizeof(vtiden) - 1);
2435                 break;
2436         case 0x9b:   /* TODO: CSI */
2437         case 0x9c:   /* TODO: ST */
2438                 break;
2439         case 0x90:   /* DCS -- Device Control String */
2440         case 0x9f:   /* APC -- Application Program Command */
2441         case 0x9e:   /* PM -- Privacy Message */
2442         case 0x9d:   /* OSC -- Operating System Command */
2443                 tstrsequence(ascii);
2444                 return;
2445         }
2446         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2447         term.esc &= ~(ESC_STR_END|ESC_STR);
2448         return;
2449 }
2450
2451 void
2452 tdectest(char c) {
2453         static char E[UTF_SIZ] = "E";
2454         int x, y;
2455
2456         if(c == '8') { /* DEC screen alignment test. */
2457                 for(x = 0; x < term.col; ++x) {
2458                         for(y = 0; y < term.row; ++y)
2459                                 tsetchar(E, &term.c.attr, x, y);
2460                 }
2461         }
2462 }
2463
2464 void
2465 tputc(char *c, int len) {
2466         uchar ascii;
2467         bool control;
2468         long unicodep;
2469         int width;
2470         Glyph *gp;
2471
2472         if(len == 1) {
2473                 width = 1;
2474                 unicodep = ascii = *c;
2475         } else {
2476                 utf8decode(c, &unicodep, UTF_SIZ);
2477                 width = wcwidth(unicodep);
2478                 control = ISCONTROLC1(unicodep);
2479                 ascii = unicodep;
2480         }
2481
2482         if(IS_SET(MODE_PRINT))
2483                 tprinter(c, len);
2484         control = ISCONTROL(unicodep);
2485
2486         /*
2487          * STR sequence must be checked before anything else
2488          * because it uses all following characters until it
2489          * receives a ESC, a SUB, a ST or any other C1 control
2490          * character.
2491          */
2492         if(term.esc & ESC_STR) {
2493                 if(width == 1 &&
2494                    (ascii == '\a' || ascii == 030 ||
2495                     ascii == 032  || ascii == 033 ||
2496                     ISCONTROLC1(unicodep))) {
2497                         term.esc &= ~(ESC_START|ESC_STR);
2498                         term.esc |= ESC_STR_END;
2499                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2500                         memmove(&strescseq.buf[strescseq.len], c, len);
2501                         strescseq.len += len;
2502                         return;
2503                 } else {
2504                 /*
2505                  * Here is a bug in terminals. If the user never sends
2506                  * some code to stop the str or esc command, then st
2507                  * will stop responding. But this is better than
2508                  * silently failing with unknown characters. At least
2509                  * then users will report back.
2510                  *
2511                  * In the case users ever get fixed, here is the code:
2512                  */
2513                 /*
2514                  * term.esc = 0;
2515                  * strhandle();
2516                  */
2517                         return;
2518                 }
2519         }
2520
2521         /*
2522          * Actions of control codes must be performed as soon they arrive
2523          * because they can be embedded inside a control sequence, and
2524          * they must not cause conflicts with sequences.
2525          */
2526         if(control) {
2527                 tcontrolcode(ascii);
2528                 /*
2529                  * control codes are not shown ever
2530                  */
2531                 return;
2532         } else if(term.esc & ESC_START) {
2533                 if(term.esc & ESC_CSI) {
2534                         csiescseq.buf[csiescseq.len++] = ascii;
2535                         if(BETWEEN(ascii, 0x40, 0x7E)
2536                                         || csiescseq.len >= \
2537                                         sizeof(csiescseq.buf)-1) {
2538                                 term.esc = 0;
2539                                 csiparse();
2540                                 csihandle();
2541                         }
2542                         return;
2543                 } else if(term.esc & ESC_ALTCHARSET) {
2544                         tdeftran(ascii);
2545                 } else if(term.esc & ESC_TEST) {
2546                         tdectest(ascii);
2547                 } else {
2548                         switch(ascii) {
2549                         case '[':
2550                                 term.esc |= ESC_CSI;
2551                                 return;
2552                         case '#':
2553                                 term.esc |= ESC_TEST;
2554                                 return;
2555                         case 'P': /* DCS -- Device Control String */
2556                         case '_': /* APC -- Application Program Command */
2557                         case '^': /* PM -- Privacy Message */
2558                         case ']': /* OSC -- Operating System Command */
2559                         case 'k': /* old title set compatibility */
2560                                 tstrsequence(ascii);
2561                                 return;
2562                         case '(': /* set primary charset G0 */
2563                         case ')': /* set secondary charset G1 */
2564                         case '*': /* set tertiary charset G2 */
2565                         case '+': /* set quaternary charset G3 */
2566                                 term.icharset = ascii - '(';
2567                                 term.esc |= ESC_ALTCHARSET;
2568                                 return;
2569                         case 'D': /* IND -- Linefeed */
2570                                 if(term.c.y == term.bot) {
2571                                         tscrollup(term.top, 1);
2572                                 } else {
2573                                         tmoveto(term.c.x, term.c.y+1);
2574                                 }
2575                                 break;
2576                         case 'E': /* NEL -- Next line */
2577                                 tnewline(1); /* always go to first col */
2578                                 break;
2579                         case 'H': /* HTS -- Horizontal tab stop */
2580                                 term.tabs[term.c.x] = 1;
2581                                 break;
2582                         case 'M': /* RI -- Reverse index */
2583                                 if(term.c.y == term.top) {
2584                                         tscrolldown(term.top, 1);
2585                                 } else {
2586                                         tmoveto(term.c.x, term.c.y-1);
2587                                 }
2588                                 break;
2589                         case 'Z': /* DECID -- Identify Terminal */
2590                                 ttywrite(vtiden, sizeof(vtiden) - 1);
2591                                 break;
2592                         case 'c': /* RIS -- Reset to inital state */
2593                                 treset();
2594                                 xresettitle();
2595                                 xloadcols();
2596                                 break;
2597                         case '=': /* DECPAM -- Application keypad */
2598                                 term.mode |= MODE_APPKEYPAD;
2599                                 break;
2600                         case '>': /* DECPNM -- Normal keypad */
2601                                 term.mode &= ~MODE_APPKEYPAD;
2602                                 break;
2603                         case '7': /* DECSC -- Save Cursor */
2604                                 tcursor(CURSOR_SAVE);
2605                                 break;
2606                         case '8': /* DECRC -- Restore Cursor */
2607                                 tcursor(CURSOR_LOAD);
2608                                 break;
2609                         case '\\': /* ST -- String Terminator */
2610                                 if(term.esc & ESC_STR_END)
2611                                         strhandle();
2612                                 break;
2613                         default:
2614                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2615                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2616                                 break;
2617                         }
2618                 }
2619                 term.esc = 0;
2620                 /*
2621                  * All characters which form part of a sequence are not
2622                  * printed
2623                  */
2624                 return;
2625         }
2626         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2627                 selclear(NULL);
2628
2629         gp = &term.line[term.c.y][term.c.x];
2630         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2631                 gp->mode |= ATTR_WRAP;
2632                 tnewline(1);
2633         }
2634
2635         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2636                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2637
2638         if(term.c.x+width > term.col)
2639                 tnewline(1);
2640
2641         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2642
2643         if(width == 2) {
2644                 gp->mode |= ATTR_WIDE;
2645                 if(term.c.x+1 < term.col) {
2646                         gp[1].c[0] = '\0';
2647                         gp[1].mode = ATTR_WDUMMY;
2648                 }
2649         }
2650         if(term.c.x+width < term.col) {
2651                 tmoveto(term.c.x+width, term.c.y);
2652         } else {
2653                 term.c.state |= CURSOR_WRAPNEXT;
2654         }
2655 }
2656
2657 void
2658 tresize(int col, int row) {
2659         int i;
2660         int minrow = MIN(row, term.row);
2661         int mincol = MIN(col, term.col);
2662         int slide = term.c.y - row + 1;
2663         bool *bp;
2664         TCursor c;
2665
2666         if(col < 1 || row < 1) {
2667                 fprintf(stderr,
2668                         "tresize: error resizing to %dx%d\n", col, row);
2669                 return;
2670         }
2671
2672         /* free unneeded rows */
2673         i = 0;
2674         if(slide > 0) {
2675                 /*
2676                  * slide screen to keep cursor where we expect it -
2677                  * tscrollup would work here, but we can optimize to
2678                  * memmove because we're freeing the earlier lines
2679                  */
2680                 for(/* i = 0 */; i < slide; i++) {
2681                         free(term.line[i]);
2682                         free(term.alt[i]);
2683                 }
2684                 memmove(term.line, term.line + slide, row * sizeof(Line));
2685                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2686         }
2687         for(i += row; i < term.row; i++) {
2688                 free(term.line[i]);
2689                 free(term.alt[i]);
2690         }
2691
2692         /* resize to new height */
2693         term.line = xrealloc(term.line, row * sizeof(Line));
2694         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2695         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2696         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2697
2698         /* resize each row to new width, zero-pad if needed */
2699         for(i = 0; i < minrow; i++) {
2700                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2701                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2702         }
2703
2704         /* allocate any new rows */
2705         for(/* i == minrow */; i < row; i++) {
2706                 term.line[i] = xmalloc(col * sizeof(Glyph));
2707                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2708         }
2709         if(col > term.col) {
2710                 bp = term.tabs + term.col;
2711
2712                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2713                 while(--bp > term.tabs && !*bp)
2714                         /* nothing */ ;
2715                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2716                         *bp = 1;
2717         }
2718         /* update terminal size */
2719         term.col = col;
2720         term.row = row;
2721         /* reset scrolling region */
2722         tsetscroll(0, row-1);
2723         /* make use of the LIMIT in tmoveto */
2724         tmoveto(term.c.x, term.c.y);
2725         /* Clearing both screens (it makes dirty all lines) */
2726         c = term.c;
2727         for(i = 0; i < 2; i++) {
2728                 if(mincol < col && 0 < minrow) {
2729                         tclearregion(mincol, 0, col - 1, minrow - 1);
2730                 }
2731                 if(0 < col && minrow < row) {
2732                         tclearregion(0, minrow, col - 1, row - 1);
2733                 }
2734                 tswapscreen();
2735                 tcursor(CURSOR_LOAD);
2736         }
2737         term.c = c;
2738 }
2739
2740 void
2741 xresize(int col, int row) {
2742         xw.tw = MAX(1, col * xw.cw);
2743         xw.th = MAX(1, row * xw.ch);
2744
2745         XFreePixmap(xw.dpy, xw.buf);
2746         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2747                         DefaultDepth(xw.dpy, xw.scr));
2748         XftDrawChange(xw.draw, xw.buf);
2749         xclear(0, 0, xw.w, xw.h);
2750 }
2751
2752 static inline ushort
2753 sixd_to_16bit(int x) {
2754         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2755 }
2756
2757 void
2758 xloadcols(void) {
2759         int i;
2760         XRenderColor color = { .alpha = 0xffff };
2761         static bool loaded;
2762         Color *cp;
2763
2764         if(loaded) {
2765                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2766                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2767         }
2768
2769         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2770         for(i = 0; i < LEN(colorname); i++) {
2771                 if(!colorname[i])
2772                         continue;
2773                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2774                         die("Could not allocate color '%s'\n", colorname[i]);
2775                 }
2776         }
2777
2778         /* load colors [16-231] ; same colors as xterm */
2779         for(i = 16; i < 6*6*6+16; i++) {
2780                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2781                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2782                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2783                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2784                         die("Could not allocate color %d\n", i);
2785         }
2786
2787         /* load colors [232-255] ; grayscale */
2788         for(; i < 256; i++) {
2789                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2790                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2791                         die("Could not allocate color %d\n", i);
2792         }
2793         loaded = true;
2794 }
2795
2796 int
2797 xsetcolorname(int x, const char *name) {
2798         XRenderColor color = { .alpha = 0xffff };
2799         Color ncolor;
2800
2801         if(!BETWEEN(x, 0, LEN(colorname)))
2802                 return 1;
2803
2804         if(!name) {
2805                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2806                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2807                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2808                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2809                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2810                                                 xw.cmap, &color, &ncolor)) {
2811                                 return 1;
2812                         }
2813
2814                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2815                         dc.col[x] = ncolor;
2816                         return 0;
2817                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2818                         color.red = color.green = color.blue = \
2819                                     0x0808 + 0x0a0a * (x - (16 + 216));
2820                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2821                                                 xw.cmap, &color, &ncolor)) {
2822                                 return 1;
2823                         }
2824
2825                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2826                         dc.col[x] = ncolor;
2827                         return 0;
2828                 } else { /* system colors */
2829                         name = colorname[x];
2830                 }
2831         }
2832         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2833                 return 1;
2834
2835         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2836         dc.col[x] = ncolor;
2837         return 0;
2838 }
2839
2840 void
2841 xtermclear(int col1, int row1, int col2, int row2) {
2842         XftDrawRect(xw.draw,
2843                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2844                         borderpx + col1 * xw.cw,
2845                         borderpx + row1 * xw.ch,
2846                         (col2-col1+1) * xw.cw,
2847                         (row2-row1+1) * xw.ch);
2848 }
2849
2850 /*
2851  * Absolute coordinates.
2852  */
2853 void
2854 xclear(int x1, int y1, int x2, int y2) {
2855         XftDrawRect(xw.draw,
2856                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2857                         x1, y1, x2-x1, y2-y1);
2858 }
2859
2860 void
2861 xhints(void) {
2862         XClassHint class = {opt_class ? opt_class : termname, termname};
2863         XWMHints wm = {.flags = InputHint, .input = 1};
2864         XSizeHints *sizeh = NULL;
2865
2866         sizeh = XAllocSizeHints();
2867
2868         sizeh->flags = PSize | PResizeInc | PBaseSize;
2869         sizeh->height = xw.h;
2870         sizeh->width = xw.w;
2871         sizeh->height_inc = xw.ch;
2872         sizeh->width_inc = xw.cw;
2873         sizeh->base_height = 2 * borderpx;
2874         sizeh->base_width = 2 * borderpx;
2875         if(xw.isfixed == True) {
2876                 sizeh->flags |= PMaxSize | PMinSize;
2877                 sizeh->min_width = sizeh->max_width = xw.w;
2878                 sizeh->min_height = sizeh->max_height = xw.h;
2879         }
2880         if(xw.gm & (XValue|YValue)) {
2881                 sizeh->flags |= USPosition | PWinGravity;
2882                 sizeh->x = xw.l;
2883                 sizeh->y = xw.t;
2884                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2885         }
2886
2887         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2888                         &class);
2889         XFree(sizeh);
2890 }
2891
2892 int
2893 xgeommasktogravity(int mask) {
2894         switch(mask & (XNegative|YNegative)) {
2895         case 0:
2896                 return NorthWestGravity;
2897         case XNegative:
2898                 return NorthEastGravity;
2899         case YNegative:
2900                 return SouthWestGravity;
2901         }
2902         return SouthEastGravity;
2903 }
2904
2905 int
2906 xloadfont(Font *f, FcPattern *pattern) {
2907         FcPattern *match;
2908         FcResult result;
2909
2910         match = FcFontMatch(NULL, pattern, &result);
2911         if(!match)
2912                 return 1;
2913
2914         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2915                 FcPatternDestroy(match);
2916                 return 1;
2917         }
2918
2919         f->set = NULL;
2920         f->pattern = FcPatternDuplicate(pattern);
2921
2922         f->ascent = f->match->ascent;
2923         f->descent = f->match->descent;
2924         f->lbearing = 0;
2925         f->rbearing = f->match->max_advance_width;
2926
2927         f->height = f->ascent + f->descent;
2928         f->width = f->lbearing + f->rbearing;
2929
2930         return 0;
2931 }
2932
2933 void
2934 xloadfonts(char *fontstr, double fontsize) {
2935         FcPattern *pattern;
2936         FcResult r_sz, r_psz;
2937         double fontval;
2938         float ceilf(float);
2939
2940         if(fontstr[0] == '-') {
2941                 pattern = XftXlfdParse(fontstr, False, False);
2942         } else {
2943                 pattern = FcNameParse((FcChar8 *)fontstr);
2944         }
2945
2946         if(!pattern)
2947                 die("st: can't open font %s\n", fontstr);
2948
2949         if(fontsize > 0) {
2950                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2951                 FcPatternDel(pattern, FC_SIZE);
2952                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2953                 usedfontsize = fontsize;
2954         } else {
2955                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2956                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2957                 if(r_psz == FcResultMatch) {
2958                         usedfontsize = fontval;
2959                 } else if(r_sz == FcResultMatch) {
2960                         usedfontsize = -1;
2961                 } else {
2962                         /*
2963                          * Default font size is 12, if none given. This is to
2964                          * have a known usedfontsize value.
2965                          */
2966                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2967                         usedfontsize = 12;
2968                 }
2969         }
2970
2971         FcConfigSubstitute(0, pattern, FcMatchPattern);
2972         FcDefaultSubstitute(pattern);
2973
2974         if(xloadfont(&dc.font, pattern))
2975                 die("st: can't open font %s\n", fontstr);
2976
2977         if(usedfontsize < 0) {
2978                 FcPatternGetDouble(dc.font.match->pattern,
2979                                    FC_PIXEL_SIZE, 0, &fontval);
2980                 usedfontsize = fontval;
2981         }
2982
2983         /* Setting character width and height. */
2984         xw.cw = ceilf(dc.font.width * cwscale);
2985         xw.ch = ceilf(dc.font.height * chscale);
2986
2987         FcPatternDel(pattern, FC_SLANT);
2988         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2989         if(xloadfont(&dc.ifont, pattern))
2990                 die("st: can't open font %s\n", fontstr);
2991
2992         FcPatternDel(pattern, FC_WEIGHT);
2993         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2994         if(xloadfont(&dc.ibfont, pattern))
2995                 die("st: can't open font %s\n", fontstr);
2996
2997         FcPatternDel(pattern, FC_SLANT);
2998         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2999         if(xloadfont(&dc.bfont, pattern))
3000                 die("st: can't open font %s\n", fontstr);
3001
3002         FcPatternDestroy(pattern);
3003 }
3004
3005 int
3006 xloadfontset(Font *f) {
3007         FcResult result;
3008
3009         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3010                 return 1;
3011         return 0;
3012 }
3013
3014 void
3015 xunloadfont(Font *f) {
3016         XftFontClose(xw.dpy, f->match);
3017         FcPatternDestroy(f->pattern);
3018         if(f->set)
3019                 FcFontSetDestroy(f->set);
3020 }
3021
3022 void
3023 xunloadfonts(void) {
3024         /* Free the loaded fonts in the font cache.  */
3025         while(frclen > 0)
3026                 XftFontClose(xw.dpy, frc[--frclen].font);
3027
3028         xunloadfont(&dc.font);
3029         xunloadfont(&dc.bfont);
3030         xunloadfont(&dc.ifont);
3031         xunloadfont(&dc.ibfont);
3032 }
3033
3034 void
3035 xzoom(const Arg *arg) {
3036         xunloadfonts();
3037         xloadfonts(usedfont, usedfontsize + arg->i);
3038         cresize(0, 0);
3039         redraw(0);
3040         xhints();
3041 }
3042
3043 void
3044 xinit(void) {
3045         XGCValues gcvalues;
3046         Cursor cursor;
3047         Window parent;
3048         pid_t thispid = getpid();
3049
3050         if(!(xw.dpy = XOpenDisplay(NULL)))
3051                 die("Can't open display\n");
3052         xw.scr = XDefaultScreen(xw.dpy);
3053         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3054
3055         /* font */
3056         if(!FcInit())
3057                 die("Could not init fontconfig.\n");
3058
3059         usedfont = (opt_font == NULL)? font : opt_font;
3060         xloadfonts(usedfont, 0);
3061
3062         /* colors */
3063         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3064         xloadcols();
3065
3066         /* adjust fixed window geometry */
3067         xw.w = 2 * borderpx + term.col * xw.cw;
3068         xw.h = 2 * borderpx + term.row * xw.ch;
3069         if(xw.gm & XNegative)
3070                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3071         if(xw.gm & YNegative)
3072                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3073
3074         /* Events */
3075         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3076         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3077         xw.attrs.bit_gravity = NorthWestGravity;
3078         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3079                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3080                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3081         xw.attrs.colormap = xw.cmap;
3082
3083         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3084                         XRootWindow(xw.dpy, xw.scr);
3085         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3086                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3087                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3088                         | CWEventMask | CWColormap, &xw.attrs);
3089
3090         memset(&gcvalues, 0, sizeof(gcvalues));
3091         gcvalues.graphics_exposures = False;
3092         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3093                         &gcvalues);
3094         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3095                         DefaultDepth(xw.dpy, xw.scr));
3096         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3097         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3098
3099         /* Xft rendering context */
3100         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3101
3102         /* input methods */
3103         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3104                 XSetLocaleModifiers("@im=local");
3105                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3106                         XSetLocaleModifiers("@im=");
3107                         if((xw.xim = XOpenIM(xw.dpy,
3108                                         NULL, NULL, NULL)) == NULL) {
3109                                 die("XOpenIM failed. Could not open input"
3110                                         " device.\n");
3111                         }
3112                 }
3113         }
3114         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3115                                            | XIMStatusNothing, XNClientWindow, xw.win,
3116                                            XNFocusWindow, xw.win, NULL);
3117         if(xw.xic == NULL)
3118                 die("XCreateIC failed. Could not obtain input method.\n");
3119
3120         /* white cursor, black outline */
3121         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3122         XDefineCursor(xw.dpy, xw.win, cursor);
3123         XRecolorCursor(xw.dpy, cursor,
3124                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3125                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3126
3127         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3128         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3129         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3130         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3131
3132         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3133         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3134                         PropModeReplace, (uchar *)&thispid, 1);
3135
3136         xresettitle();
3137         XMapWindow(xw.dpy, xw.win);
3138         xhints();
3139         XSync(xw.dpy, False);
3140 }
3141
3142 void
3143 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3144         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3145             width = charlen * xw.cw, xp, i;
3146         int frcflags;
3147         int u8fl, u8fblen, u8cblen, doesexist;
3148         char *u8c, *u8fs;
3149         long unicodep;
3150         Font *font = &dc.font;
3151         FcResult fcres;
3152         FcPattern *fcpattern, *fontpattern;
3153         FcFontSet *fcsets[] = { NULL };
3154         FcCharSet *fccharset;
3155         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3156         XRenderColor colfg, colbg;
3157         XRectangle r;
3158         int oneatatime;
3159
3160         frcflags = FRC_NORMAL;
3161
3162         if(base.mode & ATTR_ITALIC) {
3163                 if(base.fg == defaultfg)
3164                         base.fg = defaultitalic;
3165                 font = &dc.ifont;
3166                 frcflags = FRC_ITALIC;
3167         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3168                 if(base.fg == defaultfg)
3169                         base.fg = defaultitalic;
3170                 font = &dc.ibfont;
3171                 frcflags = FRC_ITALICBOLD;
3172         } else if(base.mode & ATTR_UNDERLINE) {
3173                 if(base.fg == defaultfg)
3174                         base.fg = defaultunderline;
3175         }
3176
3177         if(IS_TRUECOL(base.fg)) {
3178                 colfg.alpha = 0xffff;
3179                 colfg.red = TRUERED(base.fg);
3180                 colfg.green = TRUEGREEN(base.fg);
3181                 colfg.blue = TRUEBLUE(base.fg);
3182                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3183                 fg = &truefg;
3184         } else {
3185                 fg = &dc.col[base.fg];
3186         }
3187
3188         if(IS_TRUECOL(base.bg)) {
3189                 colbg.alpha = 0xffff;
3190                 colbg.green = TRUEGREEN(base.bg);
3191                 colbg.red = TRUERED(base.bg);
3192                 colbg.blue = TRUEBLUE(base.bg);
3193                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3194                 bg = &truebg;
3195         } else {
3196                 bg = &dc.col[base.bg];
3197         }
3198
3199         if(base.mode & ATTR_BOLD) {
3200                 /*
3201                  * change basic system colors [0-7]
3202                  * to bright system colors [8-15]
3203                  */
3204                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3205                         fg = &dc.col[base.fg + 8];
3206
3207                 if(base.mode & ATTR_ITALIC) {
3208                         font = &dc.ibfont;
3209                         frcflags = FRC_ITALICBOLD;
3210                 } else {
3211                         font = &dc.bfont;
3212                         frcflags = FRC_BOLD;
3213                 }
3214         }
3215
3216         if(IS_SET(MODE_REVERSE)) {
3217                 if(fg == &dc.col[defaultfg]) {
3218                         fg = &dc.col[defaultbg];
3219                 } else {
3220                         colfg.red = ~fg->color.red;
3221                         colfg.green = ~fg->color.green;
3222                         colfg.blue = ~fg->color.blue;
3223                         colfg.alpha = fg->color.alpha;
3224                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3225                                         &revfg);
3226                         fg = &revfg;
3227                 }
3228
3229                 if(bg == &dc.col[defaultbg]) {
3230                         bg = &dc.col[defaultfg];
3231                 } else {
3232                         colbg.red = ~bg->color.red;
3233                         colbg.green = ~bg->color.green;
3234                         colbg.blue = ~bg->color.blue;
3235                         colbg.alpha = bg->color.alpha;
3236                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3237                                         &revbg);
3238                         bg = &revbg;
3239                 }
3240         }
3241
3242         if(base.mode & ATTR_REVERSE) {
3243                 temp = fg;
3244                 fg = bg;
3245                 bg = temp;
3246         }
3247
3248         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3249                 colfg.red = fg->color.red / 2;
3250                 colfg.green = fg->color.green / 2;
3251                 colfg.blue = fg->color.blue / 2;
3252                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3253                 fg = &revfg;
3254         }
3255
3256         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3257                 fg = bg;
3258
3259         if(base.mode & ATTR_INVISIBLE)
3260                 fg = bg;
3261
3262         /* Intelligent cleaning up of the borders. */
3263         if(x == 0) {
3264                 xclear(0, (y == 0)? 0 : winy, borderpx,
3265                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3266         }
3267         if(x + charlen >= term.col) {
3268                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3269                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3270         }
3271         if(y == 0)
3272                 xclear(winx, 0, winx + width, borderpx);
3273         if(y == term.row-1)
3274                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3275
3276         /* Clean up the region we want to draw to. */
3277         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3278
3279         /* Set the clip region because Xft is sometimes dirty. */
3280         r.x = 0;
3281         r.y = 0;
3282         r.height = xw.ch;
3283         r.width = width;
3284         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3285
3286         for(xp = winx; bytelen > 0;) {
3287                 /*
3288                  * Search for the range in the to be printed string of glyphs
3289                  * that are in the main font. Then print that range. If
3290                  * some glyph is found that is not in the font, do the
3291                  * fallback dance.
3292                  */
3293                 u8fs = s;
3294                 u8fblen = 0;
3295                 u8fl = 0;
3296                 oneatatime = font->width != xw.cw;
3297                 for(;;) {
3298                         u8c = s;
3299                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3300                         s += u8cblen;
3301                         bytelen -= u8cblen;
3302
3303                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3304                         if(doesexist) {
3305                                         u8fl++;
3306                                         u8fblen += u8cblen;
3307                                         if(!oneatatime && bytelen > 0)
3308                                                         continue;
3309                         }
3310
3311                         if(u8fl > 0) {
3312                                 XftDrawStringUtf8(xw.draw, fg,
3313                                                 font->match, xp,
3314                                                 winy + font->ascent,
3315                                                 (FcChar8 *)u8fs,
3316                                                 u8fblen);
3317                                 xp += xw.cw * u8fl;
3318                         }
3319                         break;
3320                 }
3321                 if(doesexist) {
3322                         if(oneatatime)
3323                                 continue;
3324                         break;
3325                 }
3326
3327                 /* Search the font cache. */
3328                 for(i = 0; i < frclen; i++) {
3329                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3330                                         && frc[i].flags == frcflags) {
3331                                 break;
3332                         }
3333                 }
3334
3335                 /* Nothing was found. */
3336                 if(i >= frclen) {
3337                         if(!font->set)
3338                                 xloadfontset(font);
3339                         fcsets[0] = font->set;
3340
3341                         /*
3342                          * Nothing was found in the cache. Now use
3343                          * some dozen of Fontconfig calls to get the
3344                          * font for one single character.
3345                          *
3346                          * Xft and fontconfig are design failures.
3347                          */
3348                         fcpattern = FcPatternDuplicate(font->pattern);
3349                         fccharset = FcCharSetCreate();
3350
3351                         FcCharSetAddChar(fccharset, unicodep);
3352                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3353                                         fccharset);
3354                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3355                                         FcTrue);
3356
3357                         FcConfigSubstitute(0, fcpattern,
3358                                         FcMatchPattern);
3359                         FcDefaultSubstitute(fcpattern);
3360
3361                         fontpattern = FcFontSetMatch(0, fcsets,
3362                                         FcTrue, fcpattern, &fcres);
3363
3364                         /*
3365                          * Overwrite or create the new cache entry.
3366                          */
3367                         if(frclen >= LEN(frc)) {
3368                                 frclen = LEN(frc) - 1;
3369                                 XftFontClose(xw.dpy, frc[frclen].font);
3370                         }
3371
3372                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3373                                         fontpattern);
3374                         frc[frclen].flags = frcflags;
3375
3376                         i = frclen;
3377                         frclen++;
3378
3379                         FcPatternDestroy(fcpattern);
3380                         FcCharSetDestroy(fccharset);
3381                 }
3382
3383                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3384                                 xp, winy + frc[i].font->ascent,
3385                                 (FcChar8 *)u8c, u8cblen);
3386
3387                 xp += xw.cw * wcwidth(unicodep);
3388         }
3389
3390         /*
3391          * This is how the loop above actually should be. Why does the
3392          * application have to care about font details?
3393          *
3394          * I have to repeat: Xft and Fontconfig are design failures.
3395          */
3396         /*
3397         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3398                         winy + font->ascent, (FcChar8 *)s, bytelen);
3399         */
3400
3401         if(base.mode & ATTR_UNDERLINE) {
3402                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3403                                 width, 1);
3404         }
3405
3406         if(base.mode & ATTR_STRUCK) {
3407                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3408                                 width, 1);
3409         }
3410
3411         /* Reset clip to none. */
3412         XftDrawSetClip(xw.draw, 0);
3413 }
3414
3415 void
3416 xdrawcursor(void) {
3417         static int oldx = 0, oldy = 0;
3418         int sl, width, curx;
3419         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3420
3421         LIMIT(oldx, 0, term.col-1);
3422         LIMIT(oldy, 0, term.row-1);
3423
3424         curx = term.c.x;
3425
3426         /* adjust position if in dummy */
3427         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3428                 oldx--;
3429         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3430                 curx--;
3431
3432         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3433
3434         /* remove the old cursor */
3435         sl = utf8len(term.line[oldy][oldx].c);
3436         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3437         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3438                         oldy, width, sl);
3439
3440         /* draw the new one */
3441         if(!(IS_SET(MODE_HIDE))) {
3442                 if(xw.state & WIN_FOCUSED) {
3443                         if(IS_SET(MODE_REVERSE)) {
3444                                 g.mode |= ATTR_REVERSE;
3445                                 g.fg = defaultcs;
3446                                 g.bg = defaultfg;
3447                         }
3448
3449                         sl = utf8len(g.c);
3450                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3451                                 ? 2 : 1;
3452                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3453                 } else {
3454                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3455                                         borderpx + curx * xw.cw,
3456                                         borderpx + term.c.y * xw.ch,
3457                                         xw.cw - 1, 1);
3458                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3459                                         borderpx + curx * xw.cw,
3460                                         borderpx + term.c.y * xw.ch,
3461                                         1, xw.ch - 1);
3462                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3463                                         borderpx + (curx + 1) * xw.cw - 1,
3464                                         borderpx + term.c.y * xw.ch,
3465                                         1, xw.ch - 1);
3466                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3467                                         borderpx + curx * xw.cw,
3468                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3469                                         xw.cw, 1);
3470                 }
3471                 oldx = curx, oldy = term.c.y;
3472         }
3473 }
3474
3475
3476 void
3477 xsettitle(char *p) {
3478         XTextProperty prop;
3479
3480         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3481                         &prop);
3482         XSetWMName(xw.dpy, xw.win, &prop);
3483         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3484         XFree(prop.value);
3485 }
3486
3487 void
3488 xresettitle(void) {
3489         xsettitle(opt_title ? opt_title : "st");
3490 }
3491
3492 void
3493 redraw(int timeout) {
3494         struct timespec tv = {0, timeout * 1000};
3495
3496         tfulldirt();
3497         draw();
3498
3499         if(timeout > 0) {
3500                 nanosleep(&tv, NULL);
3501                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3502         }
3503 }
3504
3505 void
3506 draw(void) {
3507         drawregion(0, 0, term.col, term.row);
3508         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3509                         xw.h, 0, 0);
3510         XSetForeground(xw.dpy, dc.gc,
3511                         dc.col[IS_SET(MODE_REVERSE)?
3512                                 defaultfg : defaultbg].pixel);
3513 }
3514
3515 void
3516 drawregion(int x1, int y1, int x2, int y2) {
3517         int ic, ib, x, y, ox, sl;
3518         Glyph base, new;
3519         char buf[DRAW_BUF_SIZ];
3520         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3521         long unicodep;
3522
3523         if(!(xw.state & WIN_VISIBLE))
3524                 return;
3525
3526         for(y = y1; y < y2; y++) {
3527                 if(!term.dirty[y])
3528                         continue;
3529
3530                 xtermclear(0, y, term.col, y);
3531                 term.dirty[y] = 0;
3532                 base = term.line[y][0];
3533                 ic = ib = ox = 0;
3534                 for(x = x1; x < x2; x++) {
3535                         new = term.line[y][x];
3536                         if(new.mode == ATTR_WDUMMY)
3537                                 continue;
3538                         if(ena_sel && selected(x, y))
3539                                 new.mode ^= ATTR_REVERSE;
3540                         if(ib > 0 && (ATTRCMP(base, new)
3541                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3542                                 xdraws(buf, base, ox, y, ic, ib);
3543                                 ic = ib = 0;
3544                         }
3545                         if(ib == 0) {
3546                                 ox = x;
3547                                 base = new;
3548                         }
3549
3550                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3551                         memcpy(buf+ib, new.c, sl);
3552                         ib += sl;
3553                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3554                 }
3555                 if(ib > 0)
3556                         xdraws(buf, base, ox, y, ic, ib);
3557         }
3558         xdrawcursor();
3559 }
3560
3561 void
3562 expose(XEvent *ev) {
3563         XExposeEvent *e = &ev->xexpose;
3564
3565         if(xw.state & WIN_REDRAW) {
3566                 if(!e->count)
3567                         xw.state &= ~WIN_REDRAW;
3568         }
3569         redraw(0);
3570 }
3571
3572 void
3573 visibility(XEvent *ev) {
3574         XVisibilityEvent *e = &ev->xvisibility;
3575
3576         if(e->state == VisibilityFullyObscured) {
3577                 xw.state &= ~WIN_VISIBLE;
3578         } else if(!(xw.state & WIN_VISIBLE)) {
3579                 /* need a full redraw for next Expose, not just a buf copy */
3580                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3581         }
3582 }
3583
3584 void
3585 unmap(XEvent *ev) {
3586         xw.state &= ~WIN_VISIBLE;
3587 }
3588
3589 void
3590 xsetpointermotion(int set) {
3591         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3592         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3593 }
3594
3595 void
3596 xseturgency(int add) {
3597         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3598
3599         MODBIT(h->flags, add, XUrgencyHint);
3600         XSetWMHints(xw.dpy, xw.win, h);
3601         XFree(h);
3602 }
3603
3604 void
3605 focus(XEvent *ev) {
3606         XFocusChangeEvent *e = &ev->xfocus;
3607
3608         if(e->mode == NotifyGrab)
3609                 return;
3610
3611         if(ev->type == FocusIn) {
3612                 XSetICFocus(xw.xic);
3613                 xw.state |= WIN_FOCUSED;
3614                 xseturgency(0);
3615                 if(IS_SET(MODE_FOCUS))
3616                         ttywrite("\033[I", 3);
3617         } else {
3618                 XUnsetICFocus(xw.xic);
3619                 xw.state &= ~WIN_FOCUSED;
3620                 if(IS_SET(MODE_FOCUS))
3621                         ttywrite("\033[O", 3);
3622         }
3623 }
3624
3625 static inline bool
3626 match(uint mask, uint state) {
3627         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3628 }
3629
3630 void
3631 numlock(const Arg *dummy) {
3632         term.numlock ^= 1;
3633 }
3634
3635 char*
3636 kmap(KeySym k, uint state) {
3637         Key *kp;
3638         int i;
3639
3640         /* Check for mapped keys out of X11 function keys. */
3641         for(i = 0; i < LEN(mappedkeys); i++) {
3642                 if(mappedkeys[i] == k)
3643                         break;
3644         }
3645         if(i == LEN(mappedkeys)) {
3646                 if((k & 0xFFFF) < 0xFD00)
3647                         return NULL;
3648         }
3649
3650         for(kp = key; kp < key + LEN(key); kp++) {
3651                 if(kp->k != k)
3652                         continue;
3653
3654                 if(!match(kp->mask, state))
3655                         continue;
3656
3657                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3658                         continue;
3659                 if(term.numlock && kp->appkey == 2)
3660                         continue;
3661
3662                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3663                         continue;
3664
3665                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3666                         continue;
3667
3668                 return kp->s;
3669         }
3670
3671         return NULL;
3672 }
3673
3674 void
3675 kpress(XEvent *ev) {
3676         XKeyEvent *e = &ev->xkey;
3677         KeySym ksym;
3678         char buf[32], *customkey;
3679         int len;
3680         long c;
3681         Status status;
3682         Shortcut *bp;
3683
3684         if(IS_SET(MODE_KBDLOCK))
3685                 return;
3686
3687         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3688         /* 1. shortcuts */
3689         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3690                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3691                         bp->func(&(bp->arg));
3692                         return;
3693                 }
3694         }
3695
3696         /* 2. custom keys from config.h */
3697         if((customkey = kmap(ksym, e->state))) {
3698                 ttysend(customkey, strlen(customkey));
3699                 return;
3700         }
3701
3702         /* 3. composed string from input method */
3703         if(len == 0)
3704                 return;
3705         if(len == 1 && e->state & Mod1Mask) {
3706                 if(IS_SET(MODE_8BIT)) {
3707                         if(*buf < 0177) {
3708                                 c = *buf | 0x80;
3709                                 len = utf8encode(c, buf, UTF_SIZ);
3710                         }
3711                 } else {
3712                         buf[1] = buf[0];
3713                         buf[0] = '\033';
3714                         len = 2;
3715                 }
3716         }
3717         ttysend(buf, len);
3718 }
3719
3720
3721 void
3722 cmessage(XEvent *e) {
3723         /*
3724          * See xembed specs
3725          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3726          */
3727         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3728                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3729                         xw.state |= WIN_FOCUSED;
3730                         xseturgency(0);
3731                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3732                         xw.state &= ~WIN_FOCUSED;
3733                 }
3734         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3735                 /* Send SIGHUP to shell */
3736                 kill(pid, SIGHUP);
3737                 exit(EXIT_SUCCESS);
3738         }
3739 }
3740
3741 void
3742 cresize(int width, int height) {
3743         int col, row;
3744
3745         if(width != 0)
3746                 xw.w = width;
3747         if(height != 0)
3748                 xw.h = height;
3749
3750         col = (xw.w - 2 * borderpx) / xw.cw;
3751         row = (xw.h - 2 * borderpx) / xw.ch;
3752
3753         tresize(col, row);
3754         xresize(col, row);
3755         ttyresize();
3756 }
3757
3758 void
3759 resize(XEvent *e) {
3760         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3761                 return;
3762
3763         cresize(e->xconfigure.width, e->xconfigure.height);
3764 }
3765
3766 void
3767 run(void) {
3768         XEvent ev;
3769         int w = xw.w, h = xw.h;
3770         fd_set rfd;
3771         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3772         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3773         long deltatime;
3774
3775         /* Waiting for window mapping */
3776         while(1) {
3777                 XNextEvent(xw.dpy, &ev);
3778                 if(XFilterEvent(&ev, None))
3779                         continue;
3780                 if(ev.type == ConfigureNotify) {
3781                         w = ev.xconfigure.width;
3782                         h = ev.xconfigure.height;
3783                 } else if(ev.type == MapNotify) {
3784                         break;
3785                 }
3786         }
3787
3788         ttynew();
3789         cresize(w, h);
3790
3791         clock_gettime(CLOCK_MONOTONIC, &last);
3792         lastblink = last;
3793
3794         for(xev = actionfps;;) {
3795                 FD_ZERO(&rfd);
3796                 FD_SET(cmdfd, &rfd);
3797                 FD_SET(xfd, &rfd);
3798
3799                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3800                         if(errno == EINTR)
3801                                 continue;
3802                         die("select failed: %s\n", strerror(errno));
3803                 }
3804                 if(FD_ISSET(cmdfd, &rfd)) {
3805                         ttyread();
3806                         if(blinktimeout) {
3807                                 blinkset = tattrset(ATTR_BLINK);
3808                                 if(!blinkset)
3809                                         MODBIT(term.mode, 0, MODE_BLINK);
3810                         }
3811                 }
3812
3813                 if(FD_ISSET(xfd, &rfd))
3814                         xev = actionfps;
3815
3816                 clock_gettime(CLOCK_MONOTONIC, &now);
3817                 drawtimeout.tv_sec = 0;
3818                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3819                 tv = &drawtimeout;
3820
3821                 dodraw = 0;
3822                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3823                         tsetdirtattr(ATTR_BLINK);
3824                         term.mode ^= MODE_BLINK;
3825                         lastblink = now;
3826                         dodraw = 1;
3827                 }
3828                 deltatime = TIMEDIFF(now, last);
3829                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3830                                 || deltatime < 0) {
3831                         dodraw = 1;
3832                         last = now;
3833                 }
3834
3835                 if(dodraw) {
3836                         while(XPending(xw.dpy)) {
3837                                 XNextEvent(xw.dpy, &ev);
3838                                 if(XFilterEvent(&ev, None))
3839                                         continue;
3840                                 if(handler[ev.type])
3841                                         (handler[ev.type])(&ev);
3842                         }
3843
3844                         draw();
3845                         XFlush(xw.dpy);
3846
3847                         if(xev && !FD_ISSET(xfd, &rfd))
3848                                 xev--;
3849                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3850                                 if(blinkset) {
3851                                         if(TIMEDIFF(now, lastblink) \
3852                                                         > blinktimeout) {
3853                                                 drawtimeout.tv_nsec = 1000;
3854                                         } else {
3855                                                 drawtimeout.tv_nsec = (1E6 * \
3856                                                         (blinktimeout - \
3857                                                         TIMEDIFF(now,
3858                                                                 lastblink)));
3859                                         }
3860                                 } else {
3861                                         tv = NULL;
3862                                 }
3863                         }
3864                 }
3865         }
3866 }
3867
3868 void
3869 usage(void) {
3870         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3871         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3872         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3873 }
3874
3875 int
3876 main(int argc, char *argv[]) {
3877         char *titles;
3878         uint cols = 80, rows = 24;
3879
3880         xw.l = xw.t = 0;
3881         xw.isfixed = False;
3882
3883         ARGBEGIN {
3884         case 'a':
3885                 allowaltscreen = false;
3886                 break;
3887         case 'c':
3888                 opt_class = EARGF(usage());
3889                 break;
3890         case 'e':
3891                 /* eat all remaining arguments */
3892                 if(argc > 1) {
3893                         opt_cmd = &argv[1];
3894                         if(argv[1] != NULL && opt_title == NULL) {
3895                                 titles = xstrdup(argv[1]);
3896                                 opt_title = basename(titles);
3897                         }
3898                 }
3899                 goto run;
3900         case 'f':
3901                 opt_font = EARGF(usage());
3902                 break;
3903         case 'g':
3904                 xw.gm = XParseGeometry(EARGF(usage()),
3905                                 &xw.l, &xw.t, &cols, &rows);
3906                 break;
3907         case 'i':
3908                 xw.isfixed = True;
3909                 break;
3910         case 'o':
3911                 opt_io = EARGF(usage());
3912                 break;
3913         case 't':
3914                 opt_title = EARGF(usage());
3915                 break;
3916         case 'w':
3917                 opt_embed = EARGF(usage());
3918                 break;
3919         case 'v':
3920         default:
3921                 usage();
3922         } ARGEND;
3923
3924 run:
3925         setlocale(LC_CTYPE, "");
3926         XSetLocaleModifiers("");
3927         tnew(cols? cols : 1, rows? rows : 1);
3928         xinit();
3929         selinit();
3930         run();
3931
3932         return 0;
3933 }
3934