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 #define VT102ID "\033[?6c"
  90
  91 enum glyph_attribute {
  92         ATTR_NULL      = 0,
  93         ATTR_BOLD      = 1,
  94         ATTR_FAINT     = 2,
  95         ATTR_ITALIC    = 4,
  96         ATTR_UNDERLINE = 8,
  97         ATTR_BLINK     = 16,
  98         ATTR_REVERSE   = 32,
  99         ATTR_INVISIBLE = 64,
 100         ATTR_STRUCK    = 128,
 101         ATTR_WRAP      = 256,
 102         ATTR_WIDE      = 512,
 103         ATTR_WDUMMY    = 1024,
 104 };
 105
 106 enum cursor_movement {
 107         CURSOR_SAVE,
 108         CURSOR_LOAD
 109 };
 110
 111 enum cursor_state {
 112         CURSOR_DEFAULT  = 0,
 113         CURSOR_WRAPNEXT = 1,
 114         CURSOR_ORIGIN   = 2
 115 };
 116
 117 enum term_mode {
 118         MODE_WRAP        = 1,
 119         MODE_INSERT      = 2,
 120         MODE_APPKEYPAD   = 4,
 121         MODE_ALTSCREEN   = 8,
 122         MODE_CRLF        = 16,
 123         MODE_MOUSEBTN    = 32,
 124         MODE_MOUSEMOTION = 64,
 125         MODE_REVERSE     = 128,
 126         MODE_KBDLOCK     = 256,
 127         MODE_HIDE        = 512,
 128         MODE_ECHO        = 1024,
 129         MODE_APPCURSOR   = 2048,
 130         MODE_MOUSESGR    = 4096,
 131         MODE_8BIT        = 8192,
 132         MODE_BLINK       = 16384,
 133         MODE_FBLINK      = 32768,
 134         MODE_FOCUS       = 65536,
 135         MODE_MOUSEX10    = 131072,
 136         MODE_MOUSEMANY   = 262144,
 137         MODE_BRCKTPASTE  = 524288,
 138         MODE_PRINT       = 1048576,
 139         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 140                           |MODE_MOUSEMANY,
 141 };
 142
 143 enum charset {
 144         CS_GRAPHIC0,
 145         CS_GRAPHIC1,
 146         CS_UK,
 147         CS_USA,
 148         CS_MULTI,
 149         CS_GER,
 150         CS_FIN
 151 };
 152
 153 enum escape_state {
 154         ESC_START      = 1,
 155         ESC_CSI        = 2,
 156         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 157         ESC_ALTCHARSET = 8,
 158         ESC_STR_END    = 16, /* a final string was encountered */
 159         ESC_TEST       = 32, /* Enter in test mode */
 160 };
 161
 162 enum window_state {
 163         WIN_VISIBLE = 1,
 164         WIN_REDRAW  = 2,
 165         WIN_FOCUSED = 4
 166 };
 167
 168 enum selection_type {
 169         SEL_REGULAR = 1,
 170         SEL_RECTANGULAR = 2
 171 };
 172
 173 enum selection_snap {
 174         SNAP_WORD = 1,
 175         SNAP_LINE = 2
 176 };
 177
 178 typedef unsigned char uchar;
 179 typedef unsigned int uint;
 180 typedef unsigned long ulong;
 181 typedef unsigned short ushort;
 182
 183 typedef XftDraw *Draw;
 184 typedef XftColor Color;
 185
 186 typedef struct {
 187         char c[UTF_SIZ]; /* character code */
 188         ushort mode;      /* attribute flags */
 189         uint32_t fg;      /* foreground  */
 190         uint32_t bg;      /* background  */
 191 } Glyph;
 192
 193 typedef Glyph *Line;
 194
 195 typedef struct {
 196         Glyph attr; /* current char attributes */
 197         int x;
 198         int y;
 199         char state;
 200 } TCursor;
 201
 202 /* CSI Escape sequence structs */
 203 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 204 typedef struct {
 205         char buf[ESC_BUF_SIZ]; /* raw string */
 206         int len;               /* raw string length */
 207         char priv;
 208         int arg[ESC_ARG_SIZ];
 209         int narg;              /* nb of args */
 210         char mode;
 211 } CSIEscape;
 212
 213 /* STR Escape sequence structs */
 214 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 215 typedef struct {
 216         char type;             /* ESC type ... */
 217         char buf[STR_BUF_SIZ]; /* raw string */
 218         int len;               /* raw string length */
 219         char *args[STR_ARG_SIZ];
 220         int narg;              /* nb of args */
 221 } STREscape;
 222
 223 /* Internal representation of the screen */
 224 typedef struct {
 225         int row;      /* nb row */
 226         int col;      /* nb col */
 227         Line *line;   /* screen */
 228         Line *alt;    /* alternate screen */
 229         bool *dirty;  /* dirtyness of lines */
 230         TCursor c;    /* cursor */
 231         int top;      /* top    scroll limit */
 232         int bot;      /* bottom scroll limit */
 233         int mode;     /* terminal mode flags */
 234         int esc;      /* escape state flags */
 235         char trantbl[4]; /* charset table translation */
 236         int charset;  /* current charset */
 237         int icharset; /* selected charset for sequence */
 238         bool numlock; /* lock numbers in keyboard */
 239         bool *tabs;
 240 } Term;
 241
 242 /* Purely graphic info */
 243 typedef struct {
 244         Display *dpy;
 245         Colormap cmap;
 246         Window win;
 247         Drawable buf;
 248         Atom xembed, wmdeletewin, netwmname, netwmpid;
 249         XIM xim;
 250         XIC xic;
 251         Draw draw;
 252         Visual *vis;
 253         XSetWindowAttributes attrs;
 254         int scr;
 255         bool isfixed; /* is fixed geometry? */
 256         int l, t; /* left and top offset */
 257         int gm; /* geometry mask */
 258         int tw, th; /* tty width and height */
 259         int w, h; /* window width and height */
 260         int ch; /* char height */
 261         int cw; /* char width  */
 262         char state; /* focus, redraw, visible */
 263 } XWindow;
 264
 265 typedef struct {
 266         uint b;
 267         uint mask;
 268         char *s;
 269 } Mousekey;
 270
 271 typedef struct {
 272         KeySym k;
 273         uint mask;
 274         char *s;
 275         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 276         signed char appkey;    /* application keypad */
 277         signed char appcursor; /* application cursor */
 278         signed char crlf;      /* crlf mode          */
 279 } Key;
 280
 281 typedef struct {
 282         int mode;
 283         int type;
 284         int snap;
 285         /*
 286          * Selection variables:
 287          * nb – normalized coordinates of the beginning of the selection
 288          * ne – normalized coordinates of the end of the selection
 289          * ob – original coordinates of the beginning of the selection
 290          * oe – original coordinates of the end of the selection
 291          */
 292         struct {
 293                 int x, y;
 294         } nb, ne, ob, oe;
 295
 296         char *clip;
 297         Atom xtarget;
 298         bool alt;
 299         struct timespec tclick1;
 300         struct timespec tclick2;
 301 } Selection;
 302
 303 typedef union {
 304         int i;
 305         uint ui;
 306         float f;
 307         const void *v;
 308 } Arg;
 309
 310 typedef struct {
 311         uint mod;
 312         KeySym keysym;
 313         void (*func)(const Arg *);
 314         const Arg arg;
 315 } Shortcut;
 316
 317 /* function definitions used in config.h */
 318 static void clippaste(const Arg *);
 319 static void numlock(const Arg *);
 320 static void selpaste(const Arg *);
 321 static void xzoom(const Arg *);
 322 static void printsel(const Arg *);
 323 static void printscreen(const Arg *) ;
 324 static void toggleprinter(const Arg *);
 325
 326 /* Config.h for applying patches and the configuration. */
 327 #include "config.h"
 328
 329 /* Font structure */
 330 typedef struct {
 331         int height;
 332         int width;
 333         int ascent;
 334         int descent;
 335         short lbearing;
 336         short rbearing;
 337         XftFont *match;
 338         FcFontSet *set;
 339         FcPattern *pattern;
 340 } Font;
 341
 342 /* Drawing Context */
 343 typedef struct {
 344         Color col[MAX(LEN(colorname), 256)];
 345         Font font, bfont, ifont, ibfont;
 346         GC gc;
 347 } DC;
 348
 349 static void die(const char *, ...);
 350 static void draw(void);
 351 static void redraw(int);
 352 static void drawregion(int, int, int, int);
 353 static void execsh(void);
 354 static void sigchld(int);
 355 static void run(void);
 356
 357 static void csidump(void);
 358 static void csihandle(void);
 359 static void csiparse(void);
 360 static void csireset(void);
 361 static void strdump(void);
 362 static void strhandle(void);
 363 static void strparse(void);
 364 static void strreset(void);
 365
 366 static int tattrset(int);
 367 static void tprinter(char *, size_t);
 368 static void tdumpsel(void);
 369 static void tdumpline(int);
 370 static void tdump(void);
 371 static void tclearregion(int, int, int, int);
 372 static void tcursor(int);
 373 static void tdeletechar(int);
 374 static void tdeleteline(int);
 375 static void tinsertblank(int);
 376 static void tinsertblankline(int);
 377 static int tlinelen(int);
 378 static void tmoveto(int, int);
 379 static void tmoveato(int, int);
 380 static void tnew(int, int);
 381 static void tnewline(int);
 382 static void tputtab(int);
 383 static void tputc(char *, int);
 384 static void treset(void);
 385 static int tresize(int, int);
 386 static void tscrollup(int, int);
 387 static void tscrolldown(int, int);
 388 static void tsetattr(int *, int);
 389 static void tsetchar(char *, Glyph *, int, int);
 390 static void tsetscroll(int, int);
 391 static void tswapscreen(void);
 392 static void tsetdirt(int, int);
 393 static void tsetdirtattr(int);
 394 static void tsetmode(bool, bool, int *, int);
 395 static void tfulldirt(void);
 396 static void techo(char *, int);
 397 static void tcontrolcode(uchar );
 398 static void tdectest(char );
 399 static int32_t tdefcolor(int *, int *, int);
 400 static void tdeftran(char);
 401 static inline bool match(uint, uint);
 402 static void ttynew(void);
 403 static void ttyread(void);
 404 static void ttyresize(void);
 405 static void ttysend(char *, size_t);
 406 static void ttywrite(const char *, size_t);
 407 static void tstrsequence(uchar c);
 408
 409 static void xdraws(char *, Glyph, int, int, int, int);
 410 static void xhints(void);
 411 static void xclear(int, int, int, int);
 412 static void xdrawcursor(void);
 413 static void xinit(void);
 414 static void xloadcols(void);
 415 static int xsetcolorname(int, const char *);
 416 static int xgeommasktogravity(int);
 417 static int xloadfont(Font *, FcPattern *);
 418 static void xloadfonts(char *, double);
 419 static int xloadfontset(Font *);
 420 static void xsettitle(char *);
 421 static void xresettitle(void);
 422 static void xsetpointermotion(int);
 423 static void xseturgency(int);
 424 static void xsetsel(char *);
 425 static void xtermclear(int, int, int, int);
 426 static void xunloadfont(Font *);
 427 static void xunloadfonts(void);
 428 static void xresize(int, int);
 429
 430 static void expose(XEvent *);
 431 static void visibility(XEvent *);
 432 static void unmap(XEvent *);
 433 static char *kmap(KeySym, uint);
 434 static void kpress(XEvent *);
 435 static void cmessage(XEvent *);
 436 static void cresize(int, int);
 437 static void resize(XEvent *);
 438 static void focus(XEvent *);
 439 static void brelease(XEvent *);
 440 static void bpress(XEvent *);
 441 static void bmotion(XEvent *);
 442 static void selnotify(XEvent *);
 443 static void selclear(XEvent *);
 444 static void selrequest(XEvent *);
 445
 446 static void selinit(void);
 447 static void selnormalize(void);
 448 static inline bool selected(int, int);
 449 static char *getsel(void);
 450 static void selcopy(void);
 451 static void selscroll(int, int);
 452 static void selsnap(int, int *, int *, int);
 453 static void getbuttoninfo(XEvent *);
 454 static void mousereport(XEvent *);
 455
 456 static size_t utf8decode(char *, long *, size_t);
 457 static long utf8decodebyte(char, size_t *);
 458 static size_t utf8encode(long, char *, size_t);
 459 static char utf8encodebyte(long, size_t);
 460 static size_t utf8len(char *);
 461 static size_t utf8validate(long *, size_t);
 462
 463 static ssize_t xwrite(int, const char *, size_t);
 464 static void *xmalloc(size_t);
 465 static void *xrealloc(void *, size_t);
 466 static char *xstrdup(char *);
 467
 468 static void usage(void);
 469
 470 static void (*handler[LASTEvent])(XEvent *) = {
 471         [KeyPress] = kpress,
 472         [ClientMessage] = cmessage,
 473         [ConfigureNotify] = resize,
 474         [VisibilityNotify] = visibility,
 475         [UnmapNotify] = unmap,
 476         [Expose] = expose,
 477         [FocusIn] = focus,
 478         [FocusOut] = focus,
 479         [MotionNotify] = bmotion,
 480         [ButtonPress] = bpress,
 481         [ButtonRelease] = brelease,
 482         [SelectionClear] = selclear,
 483         [SelectionNotify] = selnotify,
 484         [SelectionRequest] = selrequest,
 485 };
 486
 487 /* Globals */
 488 static DC dc;
 489 static XWindow xw;
 490 static Term term;
 491 static CSIEscape csiescseq;
 492 static STREscape strescseq;
 493 static int cmdfd;
 494 static pid_t pid;
 495 static Selection sel;
 496 static int iofd = STDOUT_FILENO;
 497 static char **opt_cmd = NULL;
 498 static char *opt_io = NULL;
 499 static char *opt_title = NULL;
 500 static char *opt_embed = NULL;
 501 static char *opt_class = NULL;
 502 static char *opt_font = NULL;
 503 static int oldbutton = 3; /* button event on startup: 3 = release */
 504
 505 static char *usedfont = NULL;
 506 static double usedfontsize = 0;
 507
 508 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 509 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 510 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 511 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 512
 513 /* Font Ring Cache */
 514 enum {
 515         FRC_NORMAL,
 516         FRC_ITALIC,
 517         FRC_BOLD,
 518         FRC_ITALICBOLD
 519 };
 520
 521 typedef struct {
 522         XftFont *font;
 523         int flags;
 524 } Fontcache;
 525
 526 /* Fontcache is an array now. A new font will be appended to the array. */
 527 static Fontcache frc[16];
 528 static int frclen = 0;
 529
 530 ssize_t
 531 xwrite(int fd, const char *s, size_t len) {
 532         size_t aux = len;
 533
 534         while(len > 0) {
 535                 ssize_t r = write(fd, s, len);
 536                 if(r < 0)
 537                         return r;
 538                 len -= r;
 539                 s += r;
 540         }
 541         return aux;
 542 }
 543
 544 void *
 545 xmalloc(size_t len) {
 546         void *p = malloc(len);
 547
 548         if(!p)
 549                 die("Out of memory\n");
 550
 551         return p;
 552 }
 553
 554 void *
 555 xrealloc(void *p, size_t len) {
 556         if((p = realloc(p, len)) == NULL)
 557                 die("Out of memory\n");
 558
 559         return p;
 560 }
 561
 562 char *
 563 xstrdup(char *s) {
 564         if((s = strdup(s)) == NULL)
 565                 die("Out of memory\n");
 566
 567         return s;
 568 }
 569
 570 size_t
 571 utf8decode(char *c, long *u, size_t clen) {
 572         size_t i, j, len, type;
 573         long udecoded;
 574
 575         *u = UTF_INVALID;
 576         if(!clen)
 577                 return 0;
 578         udecoded = utf8decodebyte(c[0], &len);
 579         if(!BETWEEN(len, 1, UTF_SIZ))
 580                 return 1;
 581         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 582                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 583                 if(type != 0)
 584                         return j;
 585         }
 586         if(j < len)
 587                 return 0;
 588         *u = udecoded;
 589         utf8validate(u, len);
 590         return len;
 591 }
 592
 593 long
 594 utf8decodebyte(char c, size_t *i) {
 595         for(*i = 0; *i < LEN(utfmask); ++(*i))
 596                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 597                         return (uchar)c & ~utfmask[*i];
 598         return 0;
 599 }
 600
 601 size_t
 602 utf8encode(long u, char *c, size_t clen) {
 603         size_t len, i;
 604
 605         len = utf8validate(&u, 0);
 606         if(clen < len)
 607                 return 0;
 608         for(i = len - 1; i != 0; --i) {
 609                 c[i] = utf8encodebyte(u, 0);
 610                 u >>= 6;
 611         }
 612         c[0] = utf8encodebyte(u, len);
 613         return len;
 614 }
 615
 616 char
 617 utf8encodebyte(long u, size_t i) {
 618         return utfbyte[i] | (u & ~utfmask[i]);
 619 }
 620
 621 size_t
 622 utf8len(char *c) {
 623         return utf8decode(c, &(long){0}, UTF_SIZ);
 624 }
 625
 626 size_t
 627 utf8validate(long *u, size_t i) {
 628         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 629                 *u = UTF_INVALID;
 630         for(i = 1; *u > utfmax[i]; ++i)
 631                 ;
 632         return i;
 633 }
 634
 635 static void
 636 selinit(void) {
 637         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 638         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 639         sel.mode = 0;
 640         sel.ob.x = -1;
 641         sel.clip = NULL;
 642         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 643         if(sel.xtarget == None)
 644                 sel.xtarget = XA_STRING;
 645 }
 646
 647 static int
 648 x2col(int x) {
 649         x -= borderpx;
 650         x /= xw.cw;
 651
 652         return LIMIT(x, 0, term.col-1);
 653 }
 654
 655 static int
 656 y2row(int y) {
 657         y -= borderpx;
 658         y /= xw.ch;
 659
 660         return LIMIT(y, 0, term.row-1);
 661 }
 662
 663 static int tlinelen(int y) {
 664         int i = term.col;
 665
 666         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 667                 --i;
 668
 669         return i;
 670 }
 671
 672 static void
 673 selnormalize(void) {
 674         int i;
 675
 676         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 677                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 678                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 679         } else {
 680                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 681                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 682         }
 683         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 684         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 685
 686         /* expand selection over line breaks */
 687         if (sel.type == SEL_RECTANGULAR)
 688                 return;
 689         i = tlinelen(sel.nb.y);
 690         if (i < sel.nb.x)
 691                 sel.nb.x = i;
 692         if (tlinelen(sel.ne.y) <= sel.ne.x)
 693                 sel.ne.x = term.col - 1;
 694 }
 695
 696 static inline bool
 697 selected(int x, int y) {
 698         if(sel.type == SEL_RECTANGULAR)
 699                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 700                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 701
 702         return BETWEEN(y, sel.nb.y, sel.ne.y)
 703             && (y != sel.nb.y || x >= sel.nb.x)
 704             && (y != sel.ne.y || x <= sel.ne.x);
 705 }
 706
 707 void
 708 selsnap(int mode, int *x, int *y, int direction) {
 709         int newx, newy, xt, yt;
 710         Glyph *gp;
 711
 712         switch(mode) {
 713         case SNAP_WORD:
 714                 /*
 715                  * Snap around if the word wraps around at the end or
 716                  * beginning of a line.
 717                  */
 718                 for(;;) {
 719                         newx = *x + direction;
 720                         newy = *y;
 721                         if(!BETWEEN(newx, 0, term.col - 1)) {
 722                                 newy += direction;
 723                                 newx = (newx + term.col) % term.col;
 724                                 if (!BETWEEN(newy, 0, term.row - 1))
 725                                         break;
 726
 727                                 if(direction > 0)
 728                                         yt = *y, xt = *x;
 729                                 else
 730                                         yt = newy, xt = newx;
 731                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 732                                         break;
 733                         }
 734
 735                         if (newx >= tlinelen(newy))
 736                                 break;
 737
 738                         gp = &term.line[newy][newx];
 739                         if (!(gp->mode & ATTR_WDUMMY) && strchr(worddelimiters, gp->c[0]))
 740                                 break;
 741
 742                         *x = newx;
 743                         *y = newy;
 744                 }
 745                 break;
 746         case SNAP_LINE:
 747                 /*
 748                  * Snap around if the the previous line or the current one
 749                  * has set ATTR_WRAP at its end. Then the whole next or
 750                  * previous line will be selected.
 751                  */
 752                 *x = (direction < 0) ? 0 : term.col - 1;
 753                 if(direction < 0 && *y > 0) {
 754                         for(; *y > 0; *y += direction) {
 755                                 if(!(term.line[*y-1][term.col-1].mode
 756                                                 & ATTR_WRAP)) {
 757                                         break;
 758                                 }
 759                         }
 760                 } else if(direction > 0 && *y < term.row-1) {
 761                         for(; *y < term.row; *y += direction) {
 762                                 if(!(term.line[*y][term.col-1].mode
 763                                                 & ATTR_WRAP)) {
 764                                         break;
 765                                 }
 766                         }
 767                 }
 768                 break;
 769         }
 770 }
 771
 772 void
 773 getbuttoninfo(XEvent *e) {
 774         int type;
 775         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 776
 777         sel.alt = IS_SET(MODE_ALTSCREEN);
 778
 779         sel.oe.x = x2col(e->xbutton.x);
 780         sel.oe.y = y2row(e->xbutton.y);
 781
 782         if(sel.ob.y < sel.oe.y
 783                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 784                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 785                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 786         } else {
 787                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 788                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 789         }
 790         selnormalize();
 791
 792         sel.type = SEL_REGULAR;
 793         for(type = 1; type < LEN(selmasks); ++type) {
 794                 if(match(selmasks[type], state)) {
 795                         sel.type = type;
 796                         break;
 797                 }
 798         }
 799 }
 800
 801 void
 802 mousereport(XEvent *e) {
 803         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 804             button = e->xbutton.button, state = e->xbutton.state,
 805             len;
 806         char buf[40];
 807         static int ox, oy;
 808
 809         /* from urxvt */
 810         if(e->xbutton.type == MotionNotify) {
 811                 if(x == ox && y == oy)
 812                         return;
 813                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 814                         return;
 815                 /* MOUSE_MOTION: no reporting if no button is pressed */
 816                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 817                         return;
 818
 819                 button = oldbutton + 32;
 820                 ox = x;
 821                 oy = y;
 822         } else {
 823                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 824                         button = 3;
 825                 } else {
 826                         button -= Button1;
 827                         if(button >= 3)
 828                                 button += 64 - 3;
 829                 }
 830                 if(e->xbutton.type == ButtonPress) {
 831                         oldbutton = button;
 832                         ox = x;
 833                         oy = y;
 834                 } else if(e->xbutton.type == ButtonRelease) {
 835                         oldbutton = 3;
 836                         /* MODE_MOUSEX10: no button release reporting */
 837                         if(IS_SET(MODE_MOUSEX10))
 838                                 return;
 839                         if (button == 64 || button == 65)
 840                                 return;
 841                 }
 842         }
 843
 844         if(!IS_SET(MODE_MOUSEX10)) {
 845                 button += (state & ShiftMask   ? 4  : 0)
 846                         + (state & Mod4Mask    ? 8  : 0)
 847                         + (state & ControlMask ? 16 : 0);
 848         }
 849
 850         len = 0;
 851         if(IS_SET(MODE_MOUSESGR)) {
 852                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 853                                 button, x+1, y+1,
 854                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 855         } else if(x < 223 && y < 223) {
 856                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 857                                 32+button, 32+x+1, 32+y+1);
 858         } else {
 859                 return;
 860         }
 861
 862         ttywrite(buf, len);
 863 }
 864
 865 void
 866 bpress(XEvent *e) {
 867         struct timespec now;
 868         Mousekey *mk;
 869
 870         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 871                 mousereport(e);
 872                 return;
 873         }
 874
 875         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 876                 if(e->xbutton.button == mk->b
 877                                 && match(mk->mask, e->xbutton.state)) {
 878                         ttysend(mk->s, strlen(mk->s));
 879                         return;
 880                 }
 881         }
 882
 883         if(e->xbutton.button == Button1) {
 884                 clock_gettime(CLOCK_MONOTONIC, &now);
 885
 886                 /* Clear previous selection, logically and visually. */
 887                 selclear(NULL);
 888                 sel.mode = 1;
 889                 sel.type = SEL_REGULAR;
 890                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 891                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 892
 893                 /*
 894                  * If the user clicks below predefined timeouts specific
 895                  * snapping behaviour is exposed.
 896                  */
 897                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 898                         sel.snap = SNAP_LINE;
 899                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 900                         sel.snap = SNAP_WORD;
 901                 } else {
 902                         sel.snap = 0;
 903                 }
 904                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 905                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 906                 selnormalize();
 907
 908                 /*
 909                  * Draw selection, unless it's regular and we don't want to
 910                  * make clicks visible
 911                  */
 912                 if(sel.snap != 0) {
 913                         sel.mode++;
 914                         tsetdirt(sel.nb.y, sel.ne.y);
 915                 }
 916                 sel.tclick2 = sel.tclick1;
 917                 sel.tclick1 = now;
 918         }
 919 }
 920
 921 char *
 922 getsel(void) {
 923         char *str, *ptr;
 924         int y, bufsize, size, lastx, linelen;
 925         Glyph *gp, *last;
 926
 927         if(sel.ob.x == -1)
 928                 return NULL;
 929
 930         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 931         ptr = str = xmalloc(bufsize);
 932
 933         /* append every set & selected glyph to the selection */
 934         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 935                 linelen = tlinelen(y);
 936
 937                 if(sel.type == SEL_RECTANGULAR) {
 938                         gp = &term.line[y][sel.nb.x];
 939                         lastx = sel.ne.x;
 940                 } else {
 941                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 942                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 943                 }
 944                 last = &term.line[y][MIN(lastx, linelen-1)];
 945
 946                 for( ; gp <= last; ++gp) {
 947                         if(gp->mode & ATTR_WDUMMY)
 948                                 continue;
 949
 950                         size = utf8len(gp->c);
 951                         memcpy(ptr, gp->c, size);
 952                         ptr += size;
 953                 }
 954
 955                 /*
 956                  * Copy and pasting of line endings is inconsistent
 957                  * in the inconsistent terminal and GUI world.
 958                  * The best solution seems like to produce '\n' when
 959                  * something is copied from st and convert '\n' to
 960                  * '\r', when something to be pasted is received by
 961                  * st.
 962                  * FIXME: Fix the computer world.
 963                  */
 964                 if(sel.ne.y > y || lastx >= linelen)
 965                         *ptr++ = '\n';
 966         }
 967         *ptr = 0;
 968         return str;
 969 }
 970
 971 void
 972 selcopy(void) {
 973         xsetsel(getsel());
 974 }
 975
 976 void
 977 selnotify(XEvent *e) {
 978         ulong nitems, ofs, rem;
 979         int format;
 980         uchar *data, *last, *repl;
 981         Atom type;
 982
 983         ofs = 0;
 984         do {
 985                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 986                                         False, AnyPropertyType, &type, &format,
 987                                         &nitems, &rem, &data)) {
 988                         fprintf(stderr, "Clipboard allocation failed\n");
 989                         return;
 990                 }
 991
 992                 /*
 993                  * As seen in getsel:
 994                  * Line endings are inconsistent in the terminal and GUI world
 995                  * copy and pasting. When receiving some selection data,
 996                  * replace all '\n' with '\r'.
 997                  * FIXME: Fix the computer world.
 998                  */
 999                 repl = data;
1000                 last = data + nitems * format / 8;
1001                 while((repl = memchr(repl, '\n', last - repl))) {
1002                         *repl++ = '\r';
1003                 }
1004
1005                 if(IS_SET(MODE_BRCKTPASTE))
1006                         ttywrite("\033[200~", 6);
1007                 ttysend((char *)data, nitems * format / 8);
1008                 if(IS_SET(MODE_BRCKTPASTE))
1009                         ttywrite("\033[201~", 6);
1010                 XFree(data);
1011                 /* number of 32-bit chunks returned */
1012                 ofs += nitems * format / 32;
1013         } while(rem > 0);
1014 }
1015
1016 void
1017 selpaste(const Arg *dummy) {
1018         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1019                         xw.win, CurrentTime);
1020 }
1021
1022 void
1023 clippaste(const Arg *dummy) {
1024         Atom clipboard;
1025
1026         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1027         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1028                         xw.win, CurrentTime);
1029 }
1030
1031 void
1032 selclear(XEvent *e) {
1033         if(sel.ob.x == -1)
1034                 return;
1035         sel.ob.x = -1;
1036         tsetdirt(sel.nb.y, sel.ne.y);
1037 }
1038
1039 void
1040 selrequest(XEvent *e) {
1041         XSelectionRequestEvent *xsre;
1042         XSelectionEvent xev;
1043         Atom xa_targets, string;
1044
1045         xsre = (XSelectionRequestEvent *) e;
1046         xev.type = SelectionNotify;
1047         xev.requestor = xsre->requestor;
1048         xev.selection = xsre->selection;
1049         xev.target = xsre->target;
1050         xev.time = xsre->time;
1051         /* reject */
1052         xev.property = None;
1053
1054         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1055         if(xsre->target == xa_targets) {
1056                 /* respond with the supported type */
1057                 string = sel.xtarget;
1058                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1059                                 XA_ATOM, 32, PropModeReplace,
1060                                 (uchar *) &string, 1);
1061                 xev.property = xsre->property;
1062         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1063                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1064                                 xsre->target, 8, PropModeReplace,
1065                                 (uchar *) sel.clip, strlen(sel.clip));
1066                 xev.property = xsre->property;
1067         }
1068
1069         /* all done, send a notification to the listener */
1070         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1071                 fprintf(stderr, "Error sending SelectionNotify event\n");
1072 }
1073
1074 void
1075 xsetsel(char *str) {
1076         /* register the selection for both the clipboard and the primary */
1077         Atom clipboard;
1078
1079         free(sel.clip);
1080         sel.clip = str;
1081
1082         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1083
1084         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1085         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1086 }
1087
1088 void
1089 brelease(XEvent *e) {
1090         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1091                 mousereport(e);
1092                 return;
1093         }
1094
1095         if(e->xbutton.button == Button2) {
1096                 selpaste(NULL);
1097         } else if(e->xbutton.button == Button1) {
1098                 if(sel.mode < 2) {
1099                         selclear(NULL);
1100                 } else {
1101                         getbuttoninfo(e);
1102                         selcopy();
1103                 }
1104                 sel.mode = 0;
1105                 tsetdirt(sel.nb.y, sel.ne.y);
1106         }
1107 }
1108
1109 void
1110 bmotion(XEvent *e) {
1111         int oldey, oldex, oldsby, oldsey;
1112
1113         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1114                 mousereport(e);
1115                 return;
1116         }
1117
1118         if(!sel.mode)
1119                 return;
1120
1121         sel.mode++;
1122         oldey = sel.oe.y;
1123         oldex = sel.oe.x;
1124         oldsby = sel.nb.y;
1125         oldsey = sel.ne.y;
1126         getbuttoninfo(e);
1127
1128         if(oldey != sel.oe.y || oldex != sel.oe.x)
1129                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1130 }
1131
1132 void
1133 die(const char *errstr, ...) {
1134         va_list ap;
1135
1136         va_start(ap, errstr);
1137         vfprintf(stderr, errstr, ap);
1138         va_end(ap);
1139         exit(EXIT_FAILURE);
1140 }
1141
1142 void
1143 execsh(void) {
1144         char **args;
1145         char *envshell = getenv("SHELL");
1146         const struct passwd *pass = getpwuid(getuid());
1147         char buf[sizeof(long) * 8 + 1];
1148
1149         unsetenv("COLUMNS");
1150         unsetenv("LINES");
1151         unsetenv("TERMCAP");
1152
1153         if(pass) {
1154                 setenv("LOGNAME", pass->pw_name, 1);
1155                 setenv("USER", pass->pw_name, 1);
1156                 setenv("SHELL", pass->pw_shell, 0);
1157                 setenv("HOME", pass->pw_dir, 0);
1158         }
1159
1160         snprintf(buf, sizeof(buf), "%lu", xw.win);
1161         setenv("WINDOWID", buf, 1);
1162
1163         signal(SIGCHLD, SIG_DFL);
1164         signal(SIGHUP, SIG_DFL);
1165         signal(SIGINT, SIG_DFL);
1166         signal(SIGQUIT, SIG_DFL);
1167         signal(SIGTERM, SIG_DFL);
1168         signal(SIGALRM, SIG_DFL);
1169
1170         DEFAULT(envshell, shell);
1171         setenv("TERM", termname, 1);
1172         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1173         execvp(args[0], args);
1174         exit(EXIT_FAILURE);
1175 }
1176
1177 void
1178 sigchld(int a) {
1179         int stat, ret;
1180
1181         if(waitpid(pid, &stat, 0) < 0)
1182                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1183
1184         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1185         if (ret != EXIT_SUCCESS)
1186                 die("child finished with error '%d'\n", stat);
1187         exit(EXIT_SUCCESS);
1188 }
1189
1190 void
1191 ttynew(void) {
1192         int m, s;
1193         struct winsize w = {term.row, term.col, 0, 0};
1194
1195         /* seems to work fine on linux, openbsd and freebsd */
1196         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1197                 die("openpty failed: %s\n", strerror(errno));
1198
1199         switch(pid = fork()) {
1200         case -1:
1201                 die("fork failed\n");
1202                 break;
1203         case 0:
1204                 setsid(); /* create a new process group */
1205                 dup2(s, STDIN_FILENO);
1206                 dup2(s, STDOUT_FILENO);
1207                 dup2(s, STDERR_FILENO);
1208                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1209                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1210                 close(s);
1211                 close(m);
1212                 execsh();
1213                 break;
1214         default:
1215                 close(s);
1216                 cmdfd = m;
1217                 signal(SIGCHLD, sigchld);
1218                 if(opt_io) {
1219                         term.mode |= MODE_PRINT;
1220                         iofd = (!strcmp(opt_io, "-")) ?
1221                                   STDOUT_FILENO :
1222                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1223                         if(iofd < 0) {
1224                                 fprintf(stderr, "Error opening %s:%s\n",
1225                                         opt_io, strerror(errno));
1226                         }
1227                 }
1228                 break;
1229         }
1230 }
1231
1232 void
1233 ttyread(void) {
1234         static char buf[BUFSIZ];
1235         static int buflen = 0;
1236         char *ptr;
1237         char s[UTF_SIZ];
1238         int charsize; /* size of utf8 char in bytes */
1239         long unicodep;
1240         int ret;
1241
1242         /* append read bytes to unprocessed bytes */
1243         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1244                 die("Couldn't read from shell: %s\n", strerror(errno));
1245
1246         /* process every complete utf8 char */
1247         buflen += ret;
1248         ptr = buf;
1249         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1250                 utf8encode(unicodep, s, UTF_SIZ);
1251                 tputc(s, charsize);
1252                 ptr += charsize;
1253                 buflen -= charsize;
1254         }
1255
1256         /* keep any uncomplete utf8 char for the next call */
1257         memmove(buf, ptr, buflen);
1258 }
1259
1260 void
1261 ttywrite(const char *s, size_t n) {
1262         if(xwrite(cmdfd, s, n) == -1)
1263                 die("write error on tty: %s\n", strerror(errno));
1264 }
1265
1266 void
1267 ttysend(char *s, size_t n) {
1268         ttywrite(s, n);
1269         if(IS_SET(MODE_ECHO))
1270                 techo(s, n);
1271 }
1272
1273 void
1274 ttyresize(void) {
1275         struct winsize w;
1276
1277         w.ws_row = term.row;
1278         w.ws_col = term.col;
1279         w.ws_xpixel = xw.tw;
1280         w.ws_ypixel = xw.th;
1281         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1282                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1283 }
1284
1285 int
1286 tattrset(int attr) {
1287         int i, j;
1288
1289         for(i = 0; i < term.row-1; i++) {
1290                 for(j = 0; j < term.col-1; j++) {
1291                         if(term.line[i][j].mode & attr)
1292                                 return 1;
1293                 }
1294         }
1295
1296         return 0;
1297 }
1298
1299 void
1300 tsetdirt(int top, int bot) {
1301         int i;
1302
1303         LIMIT(top, 0, term.row-1);
1304         LIMIT(bot, 0, term.row-1);
1305
1306         for(i = top; i <= bot; i++)
1307                 term.dirty[i] = 1;
1308 }
1309
1310 void
1311 tsetdirtattr(int attr) {
1312         int i, j;
1313
1314         for(i = 0; i < term.row-1; i++) {
1315                 for(j = 0; j < term.col-1; j++) {
1316                         if(term.line[i][j].mode & attr) {
1317                                 tsetdirt(i, i);
1318                                 break;
1319                         }
1320                 }
1321         }
1322 }
1323
1324 void
1325 tfulldirt(void) {
1326         tsetdirt(0, term.row-1);
1327 }
1328
1329 void
1330 tcursor(int mode) {
1331         static TCursor c[2];
1332         bool alt = IS_SET(MODE_ALTSCREEN);
1333
1334         if(mode == CURSOR_SAVE) {
1335                 c[alt] = term.c;
1336         } else if(mode == CURSOR_LOAD) {
1337                 term.c = c[alt];
1338                 tmoveto(c[alt].x, c[alt].y);
1339         }
1340 }
1341
1342 void
1343 treset(void) {
1344         uint i;
1345
1346         term.c = (TCursor){{
1347                 .mode = ATTR_NULL,
1348                 .fg = defaultfg,
1349                 .bg = defaultbg
1350         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1351
1352         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1353         for(i = tabspaces; i < term.col; i += tabspaces)
1354                 term.tabs[i] = 1;
1355         term.top = 0;
1356         term.bot = term.row - 1;
1357         term.mode = MODE_WRAP;
1358         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1359         term.charset = 0;
1360
1361         tclearregion(0, 0, term.col-1, term.row-1);
1362         tmoveto(0, 0);
1363         tcursor(CURSOR_SAVE);
1364 }
1365
1366 void
1367 tnew(int col, int row) {
1368         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1369         tresize(col, row);
1370         term.numlock = 1;
1371
1372         treset();
1373 }
1374
1375 void
1376 tswapscreen(void) {
1377         Line *tmp = term.line;
1378
1379         term.line = term.alt;
1380         term.alt = tmp;
1381         term.mode ^= MODE_ALTSCREEN;
1382         tfulldirt();
1383 }
1384
1385 void
1386 tscrolldown(int orig, int n) {
1387         int i;
1388         Line temp;
1389
1390         LIMIT(n, 0, term.bot-orig+1);
1391
1392         tsetdirt(orig, term.bot-n);
1393         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1394
1395         for(i = term.bot; i >= orig+n; i--) {
1396                 temp = term.line[i];
1397                 term.line[i] = term.line[i-n];
1398                 term.line[i-n] = temp;
1399         }
1400
1401         selscroll(orig, n);
1402 }
1403
1404 void
1405 tscrollup(int orig, int n) {
1406         int i;
1407         Line temp;
1408
1409         LIMIT(n, 0, term.bot-orig+1);
1410
1411         tclearregion(0, orig, term.col-1, orig+n-1);
1412         tsetdirt(orig+n, term.bot);
1413
1414         for(i = orig; i <= term.bot-n; i++) {
1415                 temp = term.line[i];
1416                 term.line[i] = term.line[i+n];
1417                 term.line[i+n] = temp;
1418         }
1419
1420         selscroll(orig, -n);
1421 }
1422
1423 void
1424 selscroll(int orig, int n) {
1425         if(sel.ob.x == -1)
1426                 return;
1427
1428         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1429                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1430                         selclear(NULL);
1431                         return;
1432                 }
1433                 if(sel.type == SEL_RECTANGULAR) {
1434                         if(sel.ob.y < term.top)
1435                                 sel.ob.y = term.top;
1436                         if(sel.oe.y > term.bot)
1437                                 sel.oe.y = term.bot;
1438                 } else {
1439                         if(sel.ob.y < term.top) {
1440                                 sel.ob.y = term.top;
1441                                 sel.ob.x = 0;
1442                         }
1443                         if(sel.oe.y > term.bot) {
1444                                 sel.oe.y = term.bot;
1445                                 sel.oe.x = term.col;
1446                         }
1447                 }
1448                 selnormalize();
1449         }
1450 }
1451
1452 void
1453 tnewline(int first_col) {
1454         int y = term.c.y;
1455
1456         if(y == term.bot) {
1457                 tscrollup(term.top, 1);
1458         } else {
1459                 y++;
1460         }
1461         tmoveto(first_col ? 0 : term.c.x, y);
1462 }
1463
1464 void
1465 csiparse(void) {
1466         char *p = csiescseq.buf, *np;
1467         long int v;
1468
1469         csiescseq.narg = 0;
1470         if(*p == '?') {
1471                 csiescseq.priv = 1;
1472                 p++;
1473         }
1474
1475         csiescseq.buf[csiescseq.len] = '\0';
1476         while(p < csiescseq.buf+csiescseq.len) {
1477                 np = NULL;
1478                 v = strtol(p, &np, 10);
1479                 if(np == p)
1480                         v = 0;
1481                 if(v == LONG_MAX || v == LONG_MIN)
1482                         v = -1;
1483                 csiescseq.arg[csiescseq.narg++] = v;
1484                 p = np;
1485                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1486                         break;
1487                 p++;
1488         }
1489         csiescseq.mode = *p;
1490 }
1491
1492 /* for absolute user moves, when decom is set */
1493 void
1494 tmoveato(int x, int y) {
1495         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1496 }
1497
1498 void
1499 tmoveto(int x, int y) {
1500         int miny, maxy;
1501
1502         if(term.c.state & CURSOR_ORIGIN) {
1503                 miny = term.top;
1504                 maxy = term.bot;
1505         } else {
1506                 miny = 0;
1507                 maxy = term.row - 1;
1508         }
1509         LIMIT(x, 0, term.col-1);
1510         LIMIT(y, miny, maxy);
1511         term.c.state &= ~CURSOR_WRAPNEXT;
1512         term.c.x = x;
1513         term.c.y = y;
1514 }
1515
1516 void
1517 tsetchar(char *c, Glyph *attr, int x, int y) {
1518         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1519                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1520                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1521                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1522                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1523                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1524                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1525                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1526                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1527         };
1528
1529         /*
1530          * The table is proudly stolen from rxvt.
1531          */
1532         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1533                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1534                         c = vt100_0[c[0] - 0x41];
1535                 }
1536         }
1537
1538         if(term.line[y][x].mode & ATTR_WIDE) {
1539                 if(x+1 < term.col) {
1540                         term.line[y][x+1].c[0] = ' ';
1541                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1542                 }
1543         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1544                 term.line[y][x-1].c[0] = ' ';
1545                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1546         }
1547
1548         term.dirty[y] = 1;
1549         term.line[y][x] = *attr;
1550         memcpy(term.line[y][x].c, c, UTF_SIZ);
1551 }
1552
1553 void
1554 tclearregion(int x1, int y1, int x2, int y2) {
1555         int x, y, temp;
1556
1557         if(x1 > x2)
1558                 temp = x1, x1 = x2, x2 = temp;
1559         if(y1 > y2)
1560                 temp = y1, y1 = y2, y2 = temp;
1561
1562         LIMIT(x1, 0, term.col-1);
1563         LIMIT(x2, 0, term.col-1);
1564         LIMIT(y1, 0, term.row-1);
1565         LIMIT(y2, 0, term.row-1);
1566
1567         for(y = y1; y <= y2; y++) {
1568                 term.dirty[y] = 1;
1569                 for(x = x1; x <= x2; x++) {
1570                         if(selected(x, y))
1571                                 selclear(NULL);
1572                         term.line[y][x] = term.c.attr;
1573                         memcpy(term.line[y][x].c, " ", 2);
1574                 }
1575         }
1576 }
1577
1578 void
1579 tdeletechar(int n) {
1580         int dst, src, size;
1581         Glyph *line;
1582
1583         LIMIT(n, 0, term.col - term.c.x);
1584
1585         dst = term.c.x;
1586         src = term.c.x + n;
1587         size = term.col - src;
1588         line = term.line[term.c.y];
1589
1590         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1591         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1592 }
1593
1594 void
1595 tinsertblank(int n) {
1596         int dst, src, size;
1597         Glyph *line;
1598
1599         LIMIT(n, 0, term.col - term.c.x);
1600
1601         dst = term.c.x + n;
1602         src = term.c.x;
1603         size = term.col - dst;
1604         line = term.line[term.c.y];
1605
1606         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1607         tclearregion(src, term.c.y, dst - 1, term.c.y);
1608 }
1609
1610 void
1611 tinsertblankline(int n) {
1612         if(BETWEEN(term.c.y, term.top, term.bot))
1613                 tscrolldown(term.c.y, n);
1614 }
1615
1616 void
1617 tdeleteline(int n) {
1618         if(BETWEEN(term.c.y, term.top, term.bot))
1619                 tscrollup(term.c.y, n);
1620 }
1621
1622 int32_t
1623 tdefcolor(int *attr, int *npar, int l) {
1624         int32_t idx = -1;
1625         uint r, g, b;
1626
1627         switch (attr[*npar + 1]) {
1628         case 2: /* direct color in RGB space */
1629                 if (*npar + 4 >= l) {
1630                         fprintf(stderr,
1631                                 "erresc(38): Incorrect number of parameters (%d)\n",
1632                                 *npar);
1633                         break;
1634                 }
1635                 r = attr[*npar + 2];
1636                 g = attr[*npar + 3];
1637                 b = attr[*npar + 4];
1638                 *npar += 4;
1639                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1640                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1641                                 r, g, b);
1642                 else
1643                         idx = TRUECOLOR(r, g, b);
1644                 break;
1645         case 5: /* indexed color */
1646                 if (*npar + 2 >= l) {
1647                         fprintf(stderr,
1648                                 "erresc(38): Incorrect number of parameters (%d)\n",
1649                                 *npar);
1650                         break;
1651                 }
1652                 *npar += 2;
1653                 if(!BETWEEN(attr[*npar], 0, 255))
1654                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1655                 else
1656                         idx = attr[*npar];
1657                 break;
1658         case 0: /* implemented defined (only foreground) */
1659         case 1: /* transparent */
1660         case 3: /* direct color in CMY space */
1661         case 4: /* direct color in CMYK space */
1662         default:
1663                 fprintf(stderr,
1664                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1665                 break;
1666         }
1667
1668         return idx;
1669 }
1670
1671 void
1672 tsetattr(int *attr, int l) {
1673         int i;
1674         int32_t idx;
1675
1676         for(i = 0; i < l; i++) {
1677                 switch(attr[i]) {
1678                 case 0:
1679                         term.c.attr.mode &= ~(
1680                                 ATTR_BOLD       |
1681                                 ATTR_FAINT      |
1682                                 ATTR_ITALIC     |
1683                                 ATTR_UNDERLINE  |
1684                                 ATTR_BLINK      |
1685                                 ATTR_REVERSE    |
1686                                 ATTR_INVISIBLE  |
1687                                 ATTR_STRUCK     );
1688                         term.c.attr.fg = defaultfg;
1689                         term.c.attr.bg = defaultbg;
1690                         break;
1691                 case 1:
1692                         term.c.attr.mode |= ATTR_BOLD;
1693                         break;
1694                 case 2:
1695                         term.c.attr.mode |= ATTR_FAINT;
1696                         break;
1697                 case 3:
1698                         term.c.attr.mode |= ATTR_ITALIC;
1699                         break;
1700                 case 4:
1701                         term.c.attr.mode |= ATTR_UNDERLINE;
1702                         break;
1703                 case 5: /* slow blink */
1704                         /* FALLTHROUGH */
1705                 case 6: /* rapid blink */
1706                         term.c.attr.mode |= ATTR_BLINK;
1707                         break;
1708                 case 7:
1709                         term.c.attr.mode |= ATTR_REVERSE;
1710                         break;
1711                 case 8:
1712                         term.c.attr.mode |= ATTR_INVISIBLE;
1713                         break;
1714                 case 9:
1715                         term.c.attr.mode |= ATTR_STRUCK;
1716                         break;
1717                 case 22:
1718                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1719                         break;
1720                 case 23:
1721                         term.c.attr.mode &= ~ATTR_ITALIC;
1722                         break;
1723                 case 24:
1724                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1725                         break;
1726                 case 25:
1727                         term.c.attr.mode &= ~ATTR_BLINK;
1728                         break;
1729                 case 27:
1730                         term.c.attr.mode &= ~ATTR_REVERSE;
1731                         break;
1732                 case 28:
1733                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1734                         break;
1735                 case 29:
1736                         term.c.attr.mode &= ~ATTR_STRUCK;
1737                         break;
1738                 case 38:
1739                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1740                                 term.c.attr.fg = idx;
1741                         break;
1742                 case 39:
1743                         term.c.attr.fg = defaultfg;
1744                         break;
1745                 case 48:
1746                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1747                                 term.c.attr.bg = idx;
1748                         break;
1749                 case 49:
1750                         term.c.attr.bg = defaultbg;
1751                         break;
1752                 default:
1753                         if(BETWEEN(attr[i], 30, 37)) {
1754                                 term.c.attr.fg = attr[i] - 30;
1755                         } else if(BETWEEN(attr[i], 40, 47)) {
1756                                 term.c.attr.bg = attr[i] - 40;
1757                         } else if(BETWEEN(attr[i], 90, 97)) {
1758                                 term.c.attr.fg = attr[i] - 90 + 8;
1759                         } else if(BETWEEN(attr[i], 100, 107)) {
1760                                 term.c.attr.bg = attr[i] - 100 + 8;
1761                         } else {
1762                                 fprintf(stderr,
1763                                         "erresc(default): gfx attr %d unknown\n",
1764                                         attr[i]), csidump();
1765                         }
1766                         break;
1767                 }
1768         }
1769 }
1770
1771 void
1772 tsetscroll(int t, int b) {
1773         int temp;
1774
1775         LIMIT(t, 0, term.row-1);
1776         LIMIT(b, 0, term.row-1);
1777         if(t > b) {
1778                 temp = t;
1779                 t = b;
1780                 b = temp;
1781         }
1782         term.top = t;
1783         term.bot = b;
1784 }
1785
1786 void
1787 tsetmode(bool priv, bool set, int *args, int narg) {
1788         int *lim, mode;
1789         bool alt;
1790
1791         for(lim = args + narg; args < lim; ++args) {
1792                 if(priv) {
1793                         switch(*args) {
1794                         case 1: /* DECCKM -- Cursor key */
1795                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1796                                 break;
1797                         case 5: /* DECSCNM -- Reverse video */
1798                                 mode = term.mode;
1799                                 MODBIT(term.mode, set, MODE_REVERSE);
1800                                 if(mode != term.mode)
1801                                         redraw(REDRAW_TIMEOUT);
1802                                 break;
1803                         case 6: /* DECOM -- Origin */
1804                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1805                                 tmoveato(0, 0);
1806                                 break;
1807                         case 7: /* DECAWM -- Auto wrap */
1808                                 MODBIT(term.mode, set, MODE_WRAP);
1809                                 break;
1810                         case 0:  /* Error (IGNORED) */
1811                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1812                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1813                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1814                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1815                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1816                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1817                         case 42: /* DECNRCM -- National characters (IGNORED) */
1818                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1819                                 break;
1820                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1821                                 MODBIT(term.mode, !set, MODE_HIDE);
1822                                 break;
1823                         case 9:    /* X10 mouse compatibility mode */
1824                                 xsetpointermotion(0);
1825                                 MODBIT(term.mode, 0, MODE_MOUSE);
1826                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1827                                 break;
1828                         case 1000: /* 1000: report button press */
1829                                 xsetpointermotion(0);
1830                                 MODBIT(term.mode, 0, MODE_MOUSE);
1831                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1832                                 break;
1833                         case 1002: /* 1002: report motion on button press */
1834                                 xsetpointermotion(0);
1835                                 MODBIT(term.mode, 0, MODE_MOUSE);
1836                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1837                                 break;
1838                         case 1003: /* 1003: enable all mouse motions */
1839                                 xsetpointermotion(set);
1840                                 MODBIT(term.mode, 0, MODE_MOUSE);
1841                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1842                                 break;
1843                         case 1004: /* 1004: send focus events to tty */
1844                                 MODBIT(term.mode, set, MODE_FOCUS);
1845                                 break;
1846                         case 1006: /* 1006: extended reporting mode */
1847                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1848                                 break;
1849                         case 1034:
1850                                 MODBIT(term.mode, set, MODE_8BIT);
1851                                 break;
1852                         case 1049: /* swap screen & set/restore cursor as xterm */
1853                                 if (!allowaltscreen)
1854                                         break;
1855                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1856                                 /* FALLTHROUGH */
1857                         case 47: /* swap screen */
1858                         case 1047:
1859                                 if (!allowaltscreen)
1860                                         break;
1861                                 alt = IS_SET(MODE_ALTSCREEN);
1862                                 if(alt) {
1863                                         tclearregion(0, 0, term.col-1,
1864                                                         term.row-1);
1865                                 }
1866                                 if(set ^ alt) /* set is always 1 or 0 */
1867                                         tswapscreen();
1868                                 if(*args != 1049)
1869                                         break;
1870                                 /* FALLTHROUGH */
1871                         case 1048:
1872                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1873                                 break;
1874                         case 2004: /* 2004: bracketed paste mode */
1875                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1876                                 break;
1877                         /* Not implemented mouse modes. See comments there. */
1878                         case 1001: /* mouse highlight mode; can hang the
1879                                       terminal by design when implemented. */
1880                         case 1005: /* UTF-8 mouse mode; will confuse
1881                                       applications not supporting UTF-8
1882                                       and luit. */
1883                         case 1015: /* urxvt mangled mouse mode; incompatible
1884                                       and can be mistaken for other control
1885                                       codes. */
1886                         default:
1887                                 fprintf(stderr,
1888                                         "erresc: unknown private set/reset mode %d\n",
1889                                         *args);
1890                                 break;
1891                         }
1892                 } else {
1893                         switch(*args) {
1894                         case 0:  /* Error (IGNORED) */
1895                                 break;
1896                         case 2:  /* KAM -- keyboard action */
1897                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1898                                 break;
1899                         case 4:  /* IRM -- Insertion-replacement */
1900                                 MODBIT(term.mode, set, MODE_INSERT);
1901                                 break;
1902                         case 12: /* SRM -- Send/Receive */
1903                                 MODBIT(term.mode, !set, MODE_ECHO);
1904                                 break;
1905                         case 20: /* LNM -- Linefeed/new line */
1906                                 MODBIT(term.mode, set, MODE_CRLF);
1907                                 break;
1908                         default:
1909                                 fprintf(stderr,
1910                                         "erresc: unknown set/reset mode %d\n",
1911                                         *args);
1912                                 break;
1913                         }
1914                 }
1915         }
1916 }
1917
1918 void
1919 csihandle(void) {
1920         char buf[40];
1921         int len;
1922
1923         switch(csiescseq.mode) {
1924         default:
1925         unknown:
1926                 fprintf(stderr, "erresc: unknown csi ");
1927                 csidump();
1928                 /* die(""); */
1929                 break;
1930         case '@': /* ICH -- Insert <n> blank char */
1931                 DEFAULT(csiescseq.arg[0], 1);
1932                 tinsertblank(csiescseq.arg[0]);
1933                 break;
1934         case 'A': /* CUU -- Cursor <n> Up */
1935                 DEFAULT(csiescseq.arg[0], 1);
1936                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1937                 break;
1938         case 'B': /* CUD -- Cursor <n> Down */
1939         case 'e': /* VPR --Cursor <n> Down */
1940                 DEFAULT(csiescseq.arg[0], 1);
1941                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1942                 break;
1943         case 'i': /* MC -- Media Copy */
1944                 switch(csiescseq.arg[0]) {
1945                 case 0:
1946                         tdump();
1947                         break;
1948                 case 1:
1949                         tdumpline(term.c.y);
1950                         break;
1951                 case 2:
1952                         tdumpsel();
1953                         break;
1954                 case 4:
1955                         term.mode &= ~MODE_PRINT;
1956                         break;
1957                 case 5:
1958                         term.mode |= MODE_PRINT;
1959                         break;
1960                 }
1961                 break;
1962         case 'c': /* DA -- Device Attributes */
1963                 if(csiescseq.arg[0] == 0)
1964                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1965                 break;
1966         case 'C': /* CUF -- Cursor <n> Forward */
1967         case 'a': /* HPR -- Cursor <n> Forward */
1968                 DEFAULT(csiescseq.arg[0], 1);
1969                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1970                 break;
1971         case 'D': /* CUB -- Cursor <n> Backward */
1972                 DEFAULT(csiescseq.arg[0], 1);
1973                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1974                 break;
1975         case 'E': /* CNL -- Cursor <n> Down and first col */
1976                 DEFAULT(csiescseq.arg[0], 1);
1977                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1978                 break;
1979         case 'F': /* CPL -- Cursor <n> Up and first col */
1980                 DEFAULT(csiescseq.arg[0], 1);
1981                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1982                 break;
1983         case 'g': /* TBC -- Tabulation clear */
1984                 switch(csiescseq.arg[0]) {
1985                 case 0: /* clear current tab stop */
1986                         term.tabs[term.c.x] = 0;
1987                         break;
1988                 case 3: /* clear all the tabs */
1989                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1990                         break;
1991                 default:
1992                         goto unknown;
1993                 }
1994                 break;
1995         case 'G': /* CHA -- Move to <col> */
1996         case '`': /* HPA */
1997                 DEFAULT(csiescseq.arg[0], 1);
1998                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1999                 break;
2000         case 'H': /* CUP -- Move to <row> <col> */
2001         case 'f': /* HVP */
2002                 DEFAULT(csiescseq.arg[0], 1);
2003                 DEFAULT(csiescseq.arg[1], 1);
2004                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2005                 break;
2006         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2007                 DEFAULT(csiescseq.arg[0], 1);
2008                 tputtab(csiescseq.arg[0]);
2009                 break;
2010         case 'J': /* ED -- Clear screen */
2011                 selclear(NULL);
2012                 switch(csiescseq.arg[0]) {
2013                 case 0: /* below */
2014                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2015                         if(term.c.y < term.row-1) {
2016                                 tclearregion(0, term.c.y+1, term.col-1,
2017                                                 term.row-1);
2018                         }
2019                         break;
2020                 case 1: /* above */
2021                         if(term.c.y > 1)
2022                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2023                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2024                         break;
2025                 case 2: /* all */
2026                         tclearregion(0, 0, term.col-1, term.row-1);
2027                         break;
2028                 default:
2029                         goto unknown;
2030                 }
2031                 break;
2032         case 'K': /* EL -- Clear line */
2033                 switch(csiescseq.arg[0]) {
2034                 case 0: /* right */
2035                         tclearregion(term.c.x, term.c.y, term.col-1,
2036                                         term.c.y);
2037                         break;
2038                 case 1: /* left */
2039                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2040                         break;
2041                 case 2: /* all */
2042                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2043                         break;
2044                 }
2045                 break;
2046         case 'S': /* SU -- Scroll <n> line up */
2047                 DEFAULT(csiescseq.arg[0], 1);
2048                 tscrollup(term.top, csiescseq.arg[0]);
2049                 break;
2050         case 'T': /* SD -- Scroll <n> line down */
2051                 DEFAULT(csiescseq.arg[0], 1);
2052                 tscrolldown(term.top, csiescseq.arg[0]);
2053                 break;
2054         case 'L': /* IL -- Insert <n> blank lines */
2055                 DEFAULT(csiescseq.arg[0], 1);
2056                 tinsertblankline(csiescseq.arg[0]);
2057                 break;
2058         case 'l': /* RM -- Reset Mode */
2059                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2060                 break;
2061         case 'M': /* DL -- Delete <n> lines */
2062                 DEFAULT(csiescseq.arg[0], 1);
2063                 tdeleteline(csiescseq.arg[0]);
2064                 break;
2065         case 'X': /* ECH -- Erase <n> char */
2066                 DEFAULT(csiescseq.arg[0], 1);
2067                 tclearregion(term.c.x, term.c.y,
2068                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2069                 break;
2070         case 'P': /* DCH -- Delete <n> char */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tdeletechar(csiescseq.arg[0]);
2073                 break;
2074         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2075                 DEFAULT(csiescseq.arg[0], 1);
2076                 tputtab(-csiescseq.arg[0]);
2077                 break;
2078         case 'd': /* VPA -- Move to <row> */
2079                 DEFAULT(csiescseq.arg[0], 1);
2080                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2081                 break;
2082         case 'h': /* SM -- Set terminal mode */
2083                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2084                 break;
2085         case 'm': /* SGR -- Terminal attribute (color) */
2086                 tsetattr(csiescseq.arg, csiescseq.narg);
2087                 break;
2088         case 'n': /* DSR – Device Status Report (cursor position) */
2089                 if (csiescseq.arg[0] == 6) {
2090                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2091                                         term.c.y+1, term.c.x+1);
2092                         ttywrite(buf, len);
2093                 }
2094                 break;
2095         case 'r': /* DECSTBM -- Set Scrolling Region */
2096                 if(csiescseq.priv) {
2097                         goto unknown;
2098                 } else {
2099                         DEFAULT(csiescseq.arg[0], 1);
2100                         DEFAULT(csiescseq.arg[1], term.row);
2101                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2102                         tmoveato(0, 0);
2103                 }
2104                 break;
2105         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2106                 tcursor(CURSOR_SAVE);
2107                 break;
2108         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2109                 tcursor(CURSOR_LOAD);
2110                 break;
2111         }
2112 }
2113
2114 void
2115 csidump(void) {
2116         int i;
2117         uint c;
2118
2119         printf("ESC[");
2120         for(i = 0; i < csiescseq.len; i++) {
2121                 c = csiescseq.buf[i] & 0xff;
2122                 if(isprint(c)) {
2123                         putchar(c);
2124                 } else if(c == '\n') {
2125                         printf("(\\n)");
2126                 } else if(c == '\r') {
2127                         printf("(\\r)");
2128                 } else if(c == 0x1b) {
2129                         printf("(\\e)");
2130                 } else {
2131                         printf("(%02x)", c);
2132                 }
2133         }
2134         putchar('\n');
2135 }
2136
2137 void
2138 csireset(void) {
2139         memset(&csiescseq, 0, sizeof(csiescseq));
2140 }
2141
2142 void
2143 strhandle(void) {
2144         char *p = NULL;
2145         int j, narg, par;
2146
2147         term.esc &= ~(ESC_STR_END|ESC_STR);
2148         strparse();
2149         narg = strescseq.narg;
2150         par = atoi(strescseq.args[0]);
2151
2152         switch(strescseq.type) {
2153         case ']': /* OSC -- Operating System Command */
2154                 switch(par) {
2155                 case 0:
2156                 case 1:
2157                 case 2:
2158                         if(narg > 1)
2159                                 xsettitle(strescseq.args[1]);
2160                         return;
2161                 case 4: /* color set */
2162                         if(narg < 3)
2163                                 break;
2164                         p = strescseq.args[2];
2165                         /* FALLTHROUGH */
2166                 case 104: /* color reset, here p = NULL */
2167                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2168                         if(xsetcolorname(j, p)) {
2169                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2170                         } else {
2171                                 /*
2172                                  * TODO if defaultbg color is changed, borders
2173                                  * are dirty
2174                                  */
2175                                 redraw(0);
2176                         }
2177                         return;
2178                 }
2179                 break;
2180         case 'k': /* old title set compatibility */
2181                 xsettitle(strescseq.args[0]);
2182                 return;
2183         case 'P': /* DCS -- Device Control String */
2184         case '_': /* APC -- Application Program Command */
2185         case '^': /* PM -- Privacy Message */
2186                 return;
2187         }
2188
2189         fprintf(stderr, "erresc: unknown str ");
2190         strdump();
2191 }
2192
2193 void
2194 strparse(void) {
2195         char *p = strescseq.buf;
2196
2197         strescseq.narg = 0;
2198         strescseq.buf[strescseq.len] = '\0';
2199         while(p && strescseq.narg < STR_ARG_SIZ)
2200                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2201 }
2202
2203 void
2204 strdump(void) {
2205         int i;
2206         uint c;
2207
2208         printf("ESC%c", strescseq.type);
2209         for(i = 0; i < strescseq.len; i++) {
2210                 c = strescseq.buf[i] & 0xff;
2211                 if(c == '\0') {
2212                         return;
2213                 } else if(isprint(c)) {
2214                         putchar(c);
2215                 } else if(c == '\n') {
2216                         printf("(\\n)");
2217                 } else if(c == '\r') {
2218                         printf("(\\r)");
2219                 } else if(c == 0x1b) {
2220                         printf("(\\e)");
2221                 } else {
2222                         printf("(%02x)", c);
2223                 }
2224         }
2225         printf("ESC\\\n");
2226 }
2227
2228 void
2229 strreset(void) {
2230         memset(&strescseq, 0, sizeof(strescseq));
2231 }
2232
2233 void
2234 tprinter(char *s, size_t len) {
2235         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2236                 fprintf(stderr, "Error writing in %s:%s\n",
2237                         opt_io, strerror(errno));
2238                 close(iofd);
2239                 iofd = -1;
2240         }
2241 }
2242
2243 void
2244 toggleprinter(const Arg *arg) {
2245         term.mode ^= MODE_PRINT;
2246 }
2247
2248 void
2249 printscreen(const Arg *arg) {
2250         tdump();
2251 }
2252
2253 void
2254 printsel(const Arg *arg) {
2255         tdumpsel();
2256 }
2257
2258 void
2259 tdumpsel(void) {
2260         char *ptr;
2261
2262         if((ptr = getsel())) {
2263                 tprinter(ptr, strlen(ptr));
2264                 free(ptr);
2265         }
2266 }
2267
2268 void
2269 tdumpline(int n) {
2270         Glyph *bp, *end;
2271
2272         bp = &term.line[n][0];
2273         end = &bp[MIN(tlinelen(n), term.col) - 1];
2274         if(bp != end || bp->c[0] != ' ') {
2275                 for( ;bp <= end; ++bp)
2276                         tprinter(bp->c, utf8len(bp->c));
2277         }
2278         tprinter("\n", 1);
2279 }
2280
2281 void
2282 tdump(void) {
2283         int i;
2284
2285         for(i = 0; i < term.row; ++i)
2286                 tdumpline(i);
2287 }
2288
2289 void
2290 tputtab(int n) {
2291         uint x = term.c.x;
2292
2293         if(n > 0) {
2294                 while(x < term.col && n--)
2295                         for(++x; x < term.col && !term.tabs[x]; ++x)
2296                                 /* nothing */ ;
2297         } else if(n < 0) {
2298                 while(x > 0 && n++)
2299                         for(--x; x > 0 && !term.tabs[x]; --x)
2300                                 /* nothing */ ;
2301         }
2302         tmoveto(x, term.c.y);
2303 }
2304
2305 void
2306 techo(char *buf, int len) {
2307         for(; len > 0; buf++, len--) {
2308                 char c = *buf;
2309
2310                 if(ISCONTROL(c)) { /* control code */
2311                         if(c & 0x80) {
2312                                 c &= 0x7f;
2313                                 tputc("^", 1);
2314                                 tputc("[", 1);
2315                         } else if(c != '\n' && c != '\r' && c != '\t') {
2316                                 c ^= '\x40';
2317                                 tputc("^", 1);
2318                         }
2319                         tputc(&c, 1);
2320                 } else {
2321                         break;
2322                 }
2323         }
2324         if(len)
2325                 tputc(buf, len);
2326 }
2327
2328 void
2329 tdeftran(char ascii) {
2330         static char cs[] = "0B";
2331         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2332         char *p;
2333
2334         if((p = strchr(cs, ascii)) == NULL) {
2335                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2336         } else {
2337                 term.trantbl[term.icharset] = vcs[p - cs];
2338         }
2339 }
2340
2341 void
2342 tstrsequence(uchar c) {
2343         if (c & 0x80) {
2344                 switch (c) {
2345                 case 0x90:   /* DCS -- Device Control String */
2346                         c = 'P';
2347                         break;
2348                 case 0x9f:   /* APC -- Application Program Command */
2349                         c = '_';
2350                         break;
2351                 case 0x9e:   /* PM -- Privacy Message */
2352                         c = '^';
2353                         break;
2354                 case 0x9d:   /* OSC -- Operating System Command */
2355                         c = ']';
2356                         break;
2357                 }
2358         }
2359         strreset();
2360         strescseq.type = c;
2361         term.esc |= ESC_STR;
2362         return;
2363 }
2364
2365 void
2366 tcontrolcode(uchar ascii) {
2367         static char question[UTF_SIZ] = "?";
2368
2369         switch(ascii) {
2370         case '\t':   /* HT */
2371                 tputtab(1);
2372                 return;
2373         case '\b':   /* BS */
2374                 tmoveto(term.c.x-1, term.c.y);
2375                 return;
2376         case '\r':   /* CR */
2377                 tmoveto(0, term.c.y);
2378                 return;
2379         case '\f':   /* LF */
2380         case '\v':   /* VT */
2381         case '\n':   /* LF */
2382                 /* go to first col if the mode is set */
2383                 tnewline(IS_SET(MODE_CRLF));
2384                 return;
2385         case '\a':   /* BEL */
2386                 if(term.esc & ESC_STR_END) {
2387                         /* backwards compatibility to xterm */
2388                         strhandle();
2389                 } else {
2390                         if(!(xw.state & WIN_FOCUSED))
2391                                 xseturgency(1);
2392                         if (bellvolume)
2393                                 XBell(xw.dpy, bellvolume);
2394                 }
2395                 break;
2396         case '\033': /* ESC */
2397                 csireset();
2398                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2399                 term.esc |= ESC_START;
2400                 return;
2401         case '\016': /* SO */
2402                 term.charset = 0;
2403                 return;
2404         case '\017': /* SI */
2405                 term.charset = 1;
2406                 return;
2407         case '\032': /* SUB */
2408                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2409         case '\030': /* CAN */
2410                 csireset();
2411                 break;
2412         case '\005': /* ENQ (IGNORED) */
2413         case '\000': /* NUL (IGNORED) */
2414         case '\021': /* XON (IGNORED) */
2415         case '\023': /* XOFF (IGNORED) */
2416         case 0177:   /* DEL (IGNORED) */
2417                 return;
2418         case 0x84:   /* TODO: IND */
2419                 break;
2420         case 0x85:   /* NEL -- Next line */
2421                 tnewline(1); /* always go to first col */
2422                 break;
2423         case 0x88:   /* HTS -- Horizontal tab stop */
2424                 term.tabs[term.c.x] = 1;
2425                 break;
2426         case 0x8d:   /* TODO: RI */
2427         case 0x8e:   /* TODO: SS2 */
2428         case 0x8f:   /* TODO: SS3 */
2429         case 0x98:   /* TODO: SOS */
2430                 break;
2431         case 0x9a:   /* DECID -- Identify Terminal */
2432                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2433                 break;
2434         case 0x9b:   /* TODO: CSI */
2435         case 0x9c:   /* TODO: ST */
2436                 break;
2437         case 0x90:   /* DCS -- Device Control String */
2438         case 0x9f:   /* APC -- Application Program Command */
2439         case 0x9e:   /* PM -- Privacy Message */
2440         case 0x9d:   /* OSC -- Operating System Command */
2441                 tstrsequence(ascii);
2442                 return;
2443         }
2444         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2445         term.esc &= ~(ESC_STR_END|ESC_STR);
2446         return;
2447 }
2448
2449 void
2450 tdectest(char c) {
2451         static char E[UTF_SIZ] = "E";
2452         int x, y;
2453
2454         if(c == '8') { /* DEC screen alignment test. */
2455                 for(x = 0; x < term.col; ++x) {
2456                         for(y = 0; y < term.row; ++y)
2457                                 tsetchar(E, &term.c.attr, x, y);
2458                 }
2459         }
2460 }
2461
2462 void
2463 tputc(char *c, int len) {
2464         uchar ascii;
2465         bool control;
2466         long unicodep;
2467         int width;
2468         Glyph *gp;
2469
2470         if(len == 1) {
2471                 width = 1;
2472                 unicodep = ascii = *c;
2473         } else {
2474                 utf8decode(c, &unicodep, UTF_SIZ);
2475                 width = wcwidth(unicodep);
2476                 control = ISCONTROLC1(unicodep);
2477                 ascii = unicodep;
2478         }
2479
2480         if(IS_SET(MODE_PRINT))
2481                 tprinter(c, len);
2482         control = ISCONTROL(unicodep);
2483
2484         /*
2485          * STR sequence must be checked before anything else
2486          * because it uses all following characters until it
2487          * receives a ESC, a SUB, a ST or any other C1 control
2488          * character.
2489          */
2490         if(term.esc & ESC_STR) {
2491                 if(width == 1 &&
2492                    (ascii == '\a' || ascii == 030 ||
2493                     ascii == 032  || ascii == 033 ||
2494                     ISCONTROLC1(unicodep))) {
2495                         term.esc &= ~(ESC_START|ESC_STR);
2496                         term.esc |= ESC_STR_END;
2497                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2498                         memmove(&strescseq.buf[strescseq.len], c, len);
2499                         strescseq.len += len;
2500                         return;
2501                 } else {
2502                 /*
2503                  * Here is a bug in terminals. If the user never sends
2504                  * some code to stop the str or esc command, then st
2505                  * will stop responding. But this is better than
2506                  * silently failing with unknown characters. At least
2507                  * then users will report back.
2508                  *
2509                  * In the case users ever get fixed, here is the code:
2510                  */
2511                 /*
2512                  * term.esc = 0;
2513                  * strhandle();
2514                  */
2515                         return;
2516                 }
2517         }
2518
2519         /*
2520          * Actions of control codes must be performed as soon they arrive
2521          * because they can be embedded inside a control sequence, and
2522          * they must not cause conflicts with sequences.
2523          */
2524         if(control) {
2525                 tcontrolcode(ascii);
2526                 /*
2527                  * control codes are not shown ever
2528                  */
2529                 return;
2530         } else if(term.esc & ESC_START) {
2531                 if(term.esc & ESC_CSI) {
2532                         csiescseq.buf[csiescseq.len++] = ascii;
2533                         if(BETWEEN(ascii, 0x40, 0x7E)
2534                                         || csiescseq.len >= \
2535                                         sizeof(csiescseq.buf)-1) {
2536                                 term.esc = 0;
2537                                 csiparse();
2538                                 csihandle();
2539                         }
2540                         return;
2541                 } else if(term.esc & ESC_ALTCHARSET) {
2542                         tdeftran(ascii);
2543                 } else if(term.esc & ESC_TEST) {
2544                         tdectest(ascii);
2545                 } else {
2546                         switch(ascii) {
2547                         case '[':
2548                                 term.esc |= ESC_CSI;
2549                                 return;
2550                         case '#':
2551                                 term.esc |= ESC_TEST;
2552                                 return;
2553                         case 'P': /* DCS -- Device Control String */
2554                         case '_': /* APC -- Application Program Command */
2555                         case '^': /* PM -- Privacy Message */
2556                         case ']': /* OSC -- Operating System Command */
2557                         case 'k': /* old title set compatibility */
2558                                 tstrsequence(ascii);
2559                                 return;
2560                         case '(': /* set primary charset G0 */
2561                         case ')': /* set secondary charset G1 */
2562                         case '*': /* set tertiary charset G2 */
2563                         case '+': /* set quaternary charset G3 */
2564                                 term.icharset = ascii - '(';
2565                                 term.esc |= ESC_ALTCHARSET;
2566                                 return;
2567                         case 'D': /* IND -- Linefeed */
2568                                 if(term.c.y == term.bot) {
2569                                         tscrollup(term.top, 1);
2570                                 } else {
2571                                         tmoveto(term.c.x, term.c.y+1);
2572                                 }
2573                                 break;
2574                         case 'E': /* NEL -- Next line */
2575                                 tnewline(1); /* always go to first col */
2576                                 break;
2577                         case 'H': /* HTS -- Horizontal tab stop */
2578                                 term.tabs[term.c.x] = 1;
2579                                 break;
2580                         case 'M': /* RI -- Reverse index */
2581                                 if(term.c.y == term.top) {
2582                                         tscrolldown(term.top, 1);
2583                                 } else {
2584                                         tmoveto(term.c.x, term.c.y-1);
2585                                 }
2586                                 break;
2587                         case 'Z': /* DECID -- Identify Terminal */
2588                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2589                                 break;
2590                         case 'c': /* RIS -- Reset to inital state */
2591                                 treset();
2592                                 xresettitle();
2593                                 xloadcols();
2594                                 break;
2595                         case '=': /* DECPAM -- Application keypad */
2596                                 term.mode |= MODE_APPKEYPAD;
2597                                 break;
2598                         case '>': /* DECPNM -- Normal keypad */
2599                                 term.mode &= ~MODE_APPKEYPAD;
2600                                 break;
2601                         case '7': /* DECSC -- Save Cursor */
2602                                 tcursor(CURSOR_SAVE);
2603                                 break;
2604                         case '8': /* DECRC -- Restore Cursor */
2605                                 tcursor(CURSOR_LOAD);
2606                                 break;
2607                         case '\\': /* ST -- String Terminator */
2608                                 if(term.esc & ESC_STR_END)
2609                                         strhandle();
2610                                 break;
2611                         default:
2612                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2613                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2614                                 break;
2615                         }
2616                 }
2617                 term.esc = 0;
2618                 /*
2619                  * All characters which form part of a sequence are not
2620                  * printed
2621                  */
2622                 return;
2623         }
2624         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2625                 selclear(NULL);
2626
2627         gp = &term.line[term.c.y][term.c.x];
2628         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2629                 gp->mode |= ATTR_WRAP;
2630                 tnewline(1);
2631         }
2632
2633         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2634                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2635
2636         if(term.c.x+width > term.col)
2637                 tnewline(1);
2638
2639         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2640
2641         if(width == 2) {
2642                 gp->mode |= ATTR_WIDE;
2643                 if(term.c.x+1 < term.col) {
2644                         gp[1].c[0] = '\0';
2645                         gp[1].mode = ATTR_WDUMMY;
2646                 }
2647         }
2648         if(term.c.x+width < term.col) {
2649                 tmoveto(term.c.x+width, term.c.y);
2650         } else {
2651                 term.c.state |= CURSOR_WRAPNEXT;
2652         }
2653 }
2654
2655 int
2656 tresize(int col, int row) {
2657         int i;
2658         int minrow = MIN(row, term.row);
2659         int mincol = MIN(col, term.col);
2660         int slide = term.c.y - row + 1;
2661         bool *bp;
2662         Line *orig;
2663         TCursor c;
2664
2665         if(col < 1 || row < 1)
2666                 return 0;
2667
2668         /* free unneeded rows */
2669         i = 0;
2670         if(slide > 0) {
2671                 /*
2672                  * slide screen to keep cursor where we expect it -
2673                  * tscrollup would work here, but we can optimize to
2674                  * memmove because we're freeing the earlier lines
2675                  */
2676                 for(/* i = 0 */; i < slide; i++) {
2677                         free(term.line[i]);
2678                         free(term.alt[i]);
2679                 }
2680                 memmove(term.line, term.line + slide, row * sizeof(Line));
2681                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2682         }
2683         for(i += row; i < term.row; i++) {
2684                 free(term.line[i]);
2685                 free(term.alt[i]);
2686         }
2687
2688         /* resize to new height */
2689         term.line = xrealloc(term.line, row * sizeof(Line));
2690         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2691         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2692         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2693
2694         /* resize each row to new width, zero-pad if needed */
2695         for(i = 0; i < minrow; i++) {
2696                 term.dirty[i] = 1;
2697                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2698                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2699         }
2700
2701         /* allocate any new rows */
2702         for(/* i == minrow */; i < row; i++) {
2703                 term.dirty[i] = 1;
2704                 term.line[i] = xmalloc(col * sizeof(Glyph));
2705                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2706         }
2707         if(col > term.col) {
2708                 bp = term.tabs + term.col;
2709
2710                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2711                 while(--bp > term.tabs && !*bp)
2712                         /* nothing */ ;
2713                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2714                         *bp = 1;
2715         }
2716         /* update terminal size */
2717         term.col = col;
2718         term.row = row;
2719         /* reset scrolling region */
2720         tsetscroll(0, row-1);
2721         /* make use of the LIMIT in tmoveto */
2722         tmoveto(term.c.x, term.c.y);
2723         /* Clearing both screens */
2724         orig = term.line;
2725         c = term.c;
2726         do {
2727                 if(mincol < col && 0 < minrow) {
2728                         tclearregion(mincol, 0, col - 1, minrow - 1);
2729                 }
2730                 if(0 < col && minrow < row) {
2731                         tclearregion(0, minrow, col - 1, row - 1);
2732                 }
2733                 tswapscreen();
2734                 tcursor(CURSOR_LOAD);
2735         } while(orig != term.line);
2736         term.c = c;
2737
2738         return (slide > 0);
2739 }
2740
2741 void
2742 xresize(int col, int row) {
2743         xw.tw = MAX(1, col * xw.cw);
2744         xw.th = MAX(1, row * xw.ch);
2745
2746         XFreePixmap(xw.dpy, xw.buf);
2747         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2748                         DefaultDepth(xw.dpy, xw.scr));
2749         XftDrawChange(xw.draw, xw.buf);
2750         xclear(0, 0, xw.w, xw.h);
2751 }
2752
2753 static inline ushort
2754 sixd_to_16bit(int x) {
2755         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2756 }
2757
2758 void
2759 xloadcols(void) {
2760         int i;
2761         XRenderColor color = { .alpha = 0xffff };
2762         static bool loaded;
2763         Color *cp;
2764
2765         if(loaded) {
2766                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2767                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2768         }
2769
2770         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2771         for(i = 0; i < LEN(colorname); i++) {
2772                 if(!colorname[i])
2773                         continue;
2774                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2775                         die("Could not allocate color '%s'\n", colorname[i]);
2776                 }
2777         }
2778
2779         /* load colors [16-231] ; same colors as xterm */
2780         for(i = 16; i < 6*6*6+16; i++) {
2781                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2782                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2783                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2784                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2785                         die("Could not allocate color %d\n", i);
2786         }
2787
2788         /* load colors [232-255] ; grayscale */
2789         for(; i < 256; i++) {
2790                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2791                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2792                         die("Could not allocate color %d\n", i);
2793         }
2794         loaded = true;
2795 }
2796
2797 int
2798 xsetcolorname(int x, const char *name) {
2799         XRenderColor color = { .alpha = 0xffff };
2800         Color ncolor;
2801
2802         if(!BETWEEN(x, 0, LEN(colorname)))
2803                 return 1;
2804
2805         if(!name) {
2806                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2807                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2808                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2809                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2810                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2811                                                 xw.cmap, &color, &ncolor)) {
2812                                 return 1;
2813                         }
2814
2815                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2816                         dc.col[x] = ncolor;
2817                         return 0;
2818                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2819                         color.red = color.green = color.blue = \
2820                                     0x0808 + 0x0a0a * (x - (16 + 216));
2821                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2822                                                 xw.cmap, &color, &ncolor)) {
2823                                 return 1;
2824                         }
2825
2826                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2827                         dc.col[x] = ncolor;
2828                         return 0;
2829                 } else { /* system colors */
2830                         name = colorname[x];
2831                 }
2832         }
2833         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2834                 return 1;
2835
2836         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2837         dc.col[x] = ncolor;
2838         return 0;
2839 }
2840
2841 void
2842 xtermclear(int col1, int row1, int col2, int row2) {
2843         XftDrawRect(xw.draw,
2844                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2845                         borderpx + col1 * xw.cw,
2846                         borderpx + row1 * xw.ch,
2847                         (col2-col1+1) * xw.cw,
2848                         (row2-row1+1) * xw.ch);
2849 }
2850
2851 /*
2852  * Absolute coordinates.
2853  */
2854 void
2855 xclear(int x1, int y1, int x2, int y2) {
2856         XftDrawRect(xw.draw,
2857                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2858                         x1, y1, x2-x1, y2-y1);
2859 }
2860
2861 void
2862 xhints(void) {
2863         XClassHint class = {opt_class ? opt_class : termname, termname};
2864         XWMHints wm = {.flags = InputHint, .input = 1};
2865         XSizeHints *sizeh = NULL;
2866
2867         sizeh = XAllocSizeHints();
2868
2869         sizeh->flags = PSize | PResizeInc | PBaseSize;
2870         sizeh->height = xw.h;
2871         sizeh->width = xw.w;
2872         sizeh->height_inc = xw.ch;
2873         sizeh->width_inc = xw.cw;
2874         sizeh->base_height = 2 * borderpx;
2875         sizeh->base_width = 2 * borderpx;
2876         if(xw.isfixed == True) {
2877                 sizeh->flags |= PMaxSize | PMinSize;
2878                 sizeh->min_width = sizeh->max_width = xw.w;
2879                 sizeh->min_height = sizeh->max_height = xw.h;
2880         }
2881         if(xw.gm & (XValue|YValue)) {
2882                 sizeh->flags |= USPosition | PWinGravity;
2883                 sizeh->x = xw.l;
2884                 sizeh->y = xw.t;
2885                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2886         }
2887
2888         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2889                         &class);
2890         XFree(sizeh);
2891 }
2892
2893 int
2894 xgeommasktogravity(int mask) {
2895         switch(mask & (XNegative|YNegative)) {
2896         case 0:
2897                 return NorthWestGravity;
2898         case XNegative:
2899                 return NorthEastGravity;
2900         case YNegative:
2901                 return SouthWestGravity;
2902         }
2903         return SouthEastGravity;
2904 }
2905
2906 int
2907 xloadfont(Font *f, FcPattern *pattern) {
2908         FcPattern *match;
2909         FcResult result;
2910
2911         match = FcFontMatch(NULL, pattern, &result);
2912         if(!match)
2913                 return 1;
2914
2915         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2916                 FcPatternDestroy(match);
2917                 return 1;
2918         }
2919
2920         f->set = NULL;
2921         f->pattern = FcPatternDuplicate(pattern);
2922
2923         f->ascent = f->match->ascent;
2924         f->descent = f->match->descent;
2925         f->lbearing = 0;
2926         f->rbearing = f->match->max_advance_width;
2927
2928         f->height = f->ascent + f->descent;
2929         f->width = f->lbearing + f->rbearing;
2930
2931         return 0;
2932 }
2933
2934 void
2935 xloadfonts(char *fontstr, double fontsize) {
2936         FcPattern *pattern;
2937         FcResult r_sz, r_psz;
2938         double fontval;
2939         float ceilf(float);
2940
2941         if(fontstr[0] == '-') {
2942                 pattern = XftXlfdParse(fontstr, False, False);
2943         } else {
2944                 pattern = FcNameParse((FcChar8 *)fontstr);
2945         }
2946
2947         if(!pattern)
2948                 die("st: can't open font %s\n", fontstr);
2949
2950         if(fontsize > 0) {
2951                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2952                 FcPatternDel(pattern, FC_SIZE);
2953                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2954                 usedfontsize = fontsize;
2955         } else {
2956                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2957                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2958                 if(r_psz == FcResultMatch) {
2959                         usedfontsize = fontval;
2960                 } else if(r_sz == FcResultMatch) {
2961                         usedfontsize = -1;
2962                 } else {
2963                         /*
2964                          * Default font size is 12, if none given. This is to
2965                          * have a known usedfontsize value.
2966                          */
2967                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2968                         usedfontsize = 12;
2969                 }
2970         }
2971
2972         FcConfigSubstitute(0, pattern, FcMatchPattern);
2973         FcDefaultSubstitute(pattern);
2974
2975         if(xloadfont(&dc.font, pattern))
2976                 die("st: can't open font %s\n", fontstr);
2977
2978         if(usedfontsize < 0) {
2979                 FcPatternGetDouble(dc.font.match->pattern,
2980                                    FC_PIXEL_SIZE, 0, &fontval);
2981                 usedfontsize = fontval;
2982         }
2983
2984         /* Setting character width and height. */
2985         xw.cw = ceilf(dc.font.width * cwscale);
2986         xw.ch = ceilf(dc.font.height * chscale);
2987
2988         FcPatternDel(pattern, FC_SLANT);
2989         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2990         if(xloadfont(&dc.ifont, pattern))
2991                 die("st: can't open font %s\n", fontstr);
2992
2993         FcPatternDel(pattern, FC_WEIGHT);
2994         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2995         if(xloadfont(&dc.ibfont, pattern))
2996                 die("st: can't open font %s\n", fontstr);
2997
2998         FcPatternDel(pattern, FC_SLANT);
2999         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3000         if(xloadfont(&dc.bfont, pattern))
3001                 die("st: can't open font %s\n", fontstr);
3002
3003         FcPatternDestroy(pattern);
3004 }
3005
3006 int
3007 xloadfontset(Font *f) {
3008         FcResult result;
3009
3010         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3011                 return 1;
3012         return 0;
3013 }
3014
3015 void
3016 xunloadfont(Font *f) {
3017         XftFontClose(xw.dpy, f->match);
3018         FcPatternDestroy(f->pattern);
3019         if(f->set)
3020                 FcFontSetDestroy(f->set);
3021 }
3022
3023 void
3024 xunloadfonts(void) {
3025         /* Free the loaded fonts in the font cache.  */
3026         while(frclen > 0)
3027                 XftFontClose(xw.dpy, frc[--frclen].font);
3028
3029         xunloadfont(&dc.font);
3030         xunloadfont(&dc.bfont);
3031         xunloadfont(&dc.ifont);
3032         xunloadfont(&dc.ibfont);
3033 }
3034
3035 void
3036 xzoom(const Arg *arg) {
3037         xunloadfonts();
3038         xloadfonts(usedfont, usedfontsize + arg->i);
3039         cresize(0, 0);
3040         redraw(0);
3041         xhints();
3042 }
3043
3044 void
3045 xinit(void) {
3046         XGCValues gcvalues;
3047         Cursor cursor;
3048         Window parent;
3049         pid_t thispid = getpid();
3050
3051         if(!(xw.dpy = XOpenDisplay(NULL)))
3052                 die("Can't open display\n");
3053         xw.scr = XDefaultScreen(xw.dpy);
3054         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3055
3056         /* font */
3057         if(!FcInit())
3058                 die("Could not init fontconfig.\n");
3059
3060         usedfont = (opt_font == NULL)? font : opt_font;
3061         xloadfonts(usedfont, 0);
3062
3063         /* colors */
3064         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3065         xloadcols();
3066
3067         /* adjust fixed window geometry */
3068         xw.w = 2 * borderpx + term.col * xw.cw;
3069         xw.h = 2 * borderpx + term.row * xw.ch;
3070         if(xw.gm & XNegative)
3071                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3072         if(xw.gm & YNegative)
3073                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3074
3075         /* Events */
3076         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3077         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3078         xw.attrs.bit_gravity = NorthWestGravity;
3079         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3080                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3081                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3082         xw.attrs.colormap = xw.cmap;
3083
3084         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3085                         XRootWindow(xw.dpy, xw.scr);
3086         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3087                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3088                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3089                         | CWEventMask | CWColormap, &xw.attrs);
3090
3091         memset(&gcvalues, 0, sizeof(gcvalues));
3092         gcvalues.graphics_exposures = False;
3093         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3094                         &gcvalues);
3095         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3096                         DefaultDepth(xw.dpy, xw.scr));
3097         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3098         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3099
3100         /* Xft rendering context */
3101         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3102
3103         /* input methods */
3104         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3105                 XSetLocaleModifiers("@im=local");
3106                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3107                         XSetLocaleModifiers("@im=");
3108                         if((xw.xim = XOpenIM(xw.dpy,
3109                                         NULL, NULL, NULL)) == NULL) {
3110                                 die("XOpenIM failed. Could not open input"
3111                                         " device.\n");
3112                         }
3113                 }
3114         }
3115         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3116                                            | XIMStatusNothing, XNClientWindow, xw.win,
3117                                            XNFocusWindow, xw.win, NULL);
3118         if(xw.xic == NULL)
3119                 die("XCreateIC failed. Could not obtain input method.\n");
3120
3121         /* white cursor, black outline */
3122         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3123         XDefineCursor(xw.dpy, xw.win, cursor);
3124         XRecolorCursor(xw.dpy, cursor,
3125                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3126                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3127
3128         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3129         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3130         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3131         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3132
3133         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3134         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3135                         PropModeReplace, (uchar *)&thispid, 1);
3136
3137         xresettitle();
3138         XMapWindow(xw.dpy, xw.win);
3139         xhints();
3140         XSync(xw.dpy, False);
3141 }
3142
3143 void
3144 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3145         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3146             width = charlen * xw.cw, xp, i;
3147         int frcflags;
3148         int u8fl, u8fblen, u8cblen, doesexist;
3149         char *u8c, *u8fs;
3150         long unicodep;
3151         Font *font = &dc.font;
3152         FcResult fcres;
3153         FcPattern *fcpattern, *fontpattern;
3154         FcFontSet *fcsets[] = { NULL };
3155         FcCharSet *fccharset;
3156         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3157         XRenderColor colfg, colbg;
3158         XRectangle r;
3159         int oneatatime;
3160
3161         frcflags = FRC_NORMAL;
3162
3163         if(base.mode & ATTR_ITALIC) {
3164                 if(base.fg == defaultfg)
3165                         base.fg = defaultitalic;
3166                 font = &dc.ifont;
3167                 frcflags = FRC_ITALIC;
3168         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3169                 if(base.fg == defaultfg)
3170                         base.fg = defaultitalic;
3171                 font = &dc.ibfont;
3172                 frcflags = FRC_ITALICBOLD;
3173         } else if(base.mode & ATTR_UNDERLINE) {
3174                 if(base.fg == defaultfg)
3175                         base.fg = defaultunderline;
3176         }
3177
3178         if(IS_TRUECOL(base.fg)) {
3179                 colfg.alpha = 0xffff;
3180                 colfg.red = TRUERED(base.fg);
3181                 colfg.green = TRUEGREEN(base.fg);
3182                 colfg.blue = TRUEBLUE(base.fg);
3183                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3184                 fg = &truefg;
3185         } else {
3186                 fg = &dc.col[base.fg];
3187         }
3188
3189         if(IS_TRUECOL(base.bg)) {
3190                 colbg.alpha = 0xffff;
3191                 colbg.green = TRUEGREEN(base.bg);
3192                 colbg.red = TRUERED(base.bg);
3193                 colbg.blue = TRUEBLUE(base.bg);
3194                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3195                 bg = &truebg;
3196         } else {
3197                 bg = &dc.col[base.bg];
3198         }
3199
3200         if(base.mode & ATTR_BOLD) {
3201                 /*
3202                  * change basic system colors [0-7]
3203                  * to bright system colors [8-15]
3204                  */
3205                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3206                         fg = &dc.col[base.fg + 8];
3207
3208                 if(base.mode & ATTR_ITALIC) {
3209                         font = &dc.ibfont;
3210                         frcflags = FRC_ITALICBOLD;
3211                 } else {
3212                         font = &dc.bfont;
3213                         frcflags = FRC_BOLD;
3214                 }
3215         }
3216
3217         if(IS_SET(MODE_REVERSE)) {
3218                 if(fg == &dc.col[defaultfg]) {
3219                         fg = &dc.col[defaultbg];
3220                 } else {
3221                         colfg.red = ~fg->color.red;
3222                         colfg.green = ~fg->color.green;
3223                         colfg.blue = ~fg->color.blue;
3224                         colfg.alpha = fg->color.alpha;
3225                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3226                                         &revfg);
3227                         fg = &revfg;
3228                 }
3229
3230                 if(bg == &dc.col[defaultbg]) {
3231                         bg = &dc.col[defaultfg];
3232                 } else {
3233                         colbg.red = ~bg->color.red;
3234                         colbg.green = ~bg->color.green;
3235                         colbg.blue = ~bg->color.blue;
3236                         colbg.alpha = bg->color.alpha;
3237                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3238                                         &revbg);
3239                         bg = &revbg;
3240                 }
3241         }
3242
3243         if(base.mode & ATTR_REVERSE) {
3244                 temp = fg;
3245                 fg = bg;
3246                 bg = temp;
3247         }
3248
3249         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3250                 colfg.red = fg->color.red / 2;
3251                 colfg.green = fg->color.green / 2;
3252                 colfg.blue = fg->color.blue / 2;
3253                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3254                 fg = &revfg;
3255         }
3256
3257         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3258                 fg = bg;
3259
3260         if(base.mode & ATTR_INVISIBLE)
3261                 fg = bg;
3262
3263         /* Intelligent cleaning up of the borders. */
3264         if(x == 0) {
3265                 xclear(0, (y == 0)? 0 : winy, borderpx,
3266                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3267         }
3268         if(x + charlen >= term.col) {
3269                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3270                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3271         }
3272         if(y == 0)
3273                 xclear(winx, 0, winx + width, borderpx);
3274         if(y == term.row-1)
3275                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3276
3277         /* Clean up the region we want to draw to. */
3278         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3279
3280         /* Set the clip region because Xft is sometimes dirty. */
3281         r.x = 0;
3282         r.y = 0;
3283         r.height = xw.ch;
3284         r.width = width;
3285         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3286
3287         for(xp = winx; bytelen > 0;) {
3288                 /*
3289                  * Search for the range in the to be printed string of glyphs
3290                  * that are in the main font. Then print that range. If
3291                  * some glyph is found that is not in the font, do the
3292                  * fallback dance.
3293                  */
3294                 u8fs = s;
3295                 u8fblen = 0;
3296                 u8fl = 0;
3297                 oneatatime = font->width != xw.cw;
3298                 for(;;) {
3299                         u8c = s;
3300                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3301                         s += u8cblen;
3302                         bytelen -= u8cblen;
3303
3304                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3305                         if(doesexist) {
3306                                         u8fl++;
3307                                         u8fblen += u8cblen;
3308                                         if(!oneatatime && bytelen > 0)
3309                                                         continue;
3310                         }
3311
3312                         if(u8fl > 0) {
3313                                 XftDrawStringUtf8(xw.draw, fg,
3314                                                 font->match, xp,
3315                                                 winy + font->ascent,
3316                                                 (FcChar8 *)u8fs,
3317                                                 u8fblen);
3318                                 xp += xw.cw * u8fl;
3319                         }
3320                         break;
3321                 }
3322                 if(doesexist) {
3323                         if(oneatatime)
3324                                 continue;
3325                         break;
3326                 }
3327
3328                 /* Search the font cache. */
3329                 for(i = 0; i < frclen; i++) {
3330                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3331                                         && frc[i].flags == frcflags) {
3332                                 break;
3333                         }
3334                 }
3335
3336                 /* Nothing was found. */
3337                 if(i >= frclen) {
3338                         if(!font->set)
3339                                 xloadfontset(font);
3340                         fcsets[0] = font->set;
3341
3342                         /*
3343                          * Nothing was found in the cache. Now use
3344                          * some dozen of Fontconfig calls to get the
3345                          * font for one single character.
3346                          *
3347                          * Xft and fontconfig are design failures.
3348                          */
3349                         fcpattern = FcPatternDuplicate(font->pattern);
3350                         fccharset = FcCharSetCreate();
3351
3352                         FcCharSetAddChar(fccharset, unicodep);
3353                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3354                                         fccharset);
3355                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3356                                         FcTrue);
3357
3358                         FcConfigSubstitute(0, fcpattern,
3359                                         FcMatchPattern);
3360                         FcDefaultSubstitute(fcpattern);
3361
3362                         fontpattern = FcFontSetMatch(0, fcsets,
3363                                         FcTrue, fcpattern, &fcres);
3364
3365                         /*
3366                          * Overwrite or create the new cache entry.
3367                          */
3368                         if(frclen >= LEN(frc)) {
3369                                 frclen = LEN(frc) - 1;
3370                                 XftFontClose(xw.dpy, frc[frclen].font);
3371                         }
3372
3373                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3374                                         fontpattern);
3375                         frc[frclen].flags = frcflags;
3376
3377                         i = frclen;
3378                         frclen++;
3379
3380                         FcPatternDestroy(fcpattern);
3381                         FcCharSetDestroy(fccharset);
3382                 }
3383
3384                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3385                                 xp, winy + frc[i].font->ascent,
3386                                 (FcChar8 *)u8c, u8cblen);
3387
3388                 xp += xw.cw * wcwidth(unicodep);
3389         }
3390
3391         /*
3392          * This is how the loop above actually should be. Why does the
3393          * application have to care about font details?
3394          *
3395          * I have to repeat: Xft and Fontconfig are design failures.
3396          */
3397         /*
3398         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3399                         winy + font->ascent, (FcChar8 *)s, bytelen);
3400         */
3401
3402         if(base.mode & ATTR_UNDERLINE) {
3403                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3404                                 width, 1);
3405         }
3406
3407         if(base.mode & ATTR_STRUCK) {
3408                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3409                                 width, 1);
3410         }
3411
3412         /* Reset clip to none. */
3413         XftDrawSetClip(xw.draw, 0);
3414 }
3415
3416 void
3417 xdrawcursor(void) {
3418         static int oldx = 0, oldy = 0;
3419         int sl, width, curx;
3420         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3421
3422         LIMIT(oldx, 0, term.col-1);
3423         LIMIT(oldy, 0, term.row-1);
3424
3425         curx = term.c.x;
3426
3427         /* adjust position if in dummy */
3428         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3429                 oldx--;
3430         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3431                 curx--;
3432
3433         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3434
3435         /* remove the old cursor */
3436         sl = utf8len(term.line[oldy][oldx].c);
3437         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3438         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3439                         oldy, width, sl);
3440
3441         /* draw the new one */
3442         if(!(IS_SET(MODE_HIDE))) {
3443                 if(xw.state & WIN_FOCUSED) {
3444                         if(IS_SET(MODE_REVERSE)) {
3445                                 g.mode |= ATTR_REVERSE;
3446                                 g.fg = defaultcs;
3447                                 g.bg = defaultfg;
3448                         }
3449
3450                         sl = utf8len(g.c);
3451                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3452                                 ? 2 : 1;
3453                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3454                 } else {
3455                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3456                                         borderpx + curx * xw.cw,
3457                                         borderpx + term.c.y * xw.ch,
3458                                         xw.cw - 1, 1);
3459                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3460                                         borderpx + curx * xw.cw,
3461                                         borderpx + term.c.y * xw.ch,
3462                                         1, xw.ch - 1);
3463                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3464                                         borderpx + (curx + 1) * xw.cw - 1,
3465                                         borderpx + term.c.y * xw.ch,
3466                                         1, xw.ch - 1);
3467                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3468                                         borderpx + curx * xw.cw,
3469                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3470                                         xw.cw, 1);
3471                 }
3472                 oldx = curx, oldy = term.c.y;
3473         }
3474 }
3475
3476
3477 void
3478 xsettitle(char *p) {
3479         XTextProperty prop;
3480
3481         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3482                         &prop);
3483         XSetWMName(xw.dpy, xw.win, &prop);
3484         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3485         XFree(prop.value);
3486 }
3487
3488 void
3489 xresettitle(void) {
3490         xsettitle(opt_title ? opt_title : "st");
3491 }
3492
3493 void
3494 redraw(int timeout) {
3495         struct timespec tv = {0, timeout * 1000};
3496
3497         tfulldirt();
3498         draw();
3499
3500         if(timeout > 0) {
3501                 nanosleep(&tv, NULL);
3502                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3503         }
3504 }
3505
3506 void
3507 draw(void) {
3508         drawregion(0, 0, term.col, term.row);
3509         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3510                         xw.h, 0, 0);
3511         XSetForeground(xw.dpy, dc.gc,
3512                         dc.col[IS_SET(MODE_REVERSE)?
3513                                 defaultfg : defaultbg].pixel);
3514 }
3515
3516 void
3517 drawregion(int x1, int y1, int x2, int y2) {
3518         int ic, ib, x, y, ox, sl;
3519         Glyph base, new;
3520         char buf[DRAW_BUF_SIZ];
3521         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3522         long unicodep;
3523
3524         if(!(xw.state & WIN_VISIBLE))
3525                 return;
3526
3527         for(y = y1; y < y2; y++) {
3528                 if(!term.dirty[y])
3529                         continue;
3530
3531                 xtermclear(0, y, term.col, y);
3532                 term.dirty[y] = 0;
3533                 base = term.line[y][0];
3534                 ic = ib = ox = 0;
3535                 for(x = x1; x < x2; x++) {
3536                         new = term.line[y][x];
3537                         if(new.mode == ATTR_WDUMMY)
3538                                 continue;
3539                         if(ena_sel && selected(x, y))
3540                                 new.mode ^= ATTR_REVERSE;
3541                         if(ib > 0 && (ATTRCMP(base, new)
3542                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3543                                 xdraws(buf, base, ox, y, ic, ib);
3544                                 ic = ib = 0;
3545                         }
3546                         if(ib == 0) {
3547                                 ox = x;
3548                                 base = new;
3549                         }
3550
3551                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3552                         memcpy(buf+ib, new.c, sl);
3553                         ib += sl;
3554                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3555                 }
3556                 if(ib > 0)
3557                         xdraws(buf, base, ox, y, ic, ib);
3558         }
3559         xdrawcursor();
3560 }
3561
3562 void
3563 expose(XEvent *ev) {
3564         XExposeEvent *e = &ev->xexpose;
3565
3566         if(xw.state & WIN_REDRAW) {
3567                 if(!e->count)
3568                         xw.state &= ~WIN_REDRAW;
3569         }
3570         redraw(0);
3571 }
3572
3573 void
3574 visibility(XEvent *ev) {
3575         XVisibilityEvent *e = &ev->xvisibility;
3576
3577         if(e->state == VisibilityFullyObscured) {
3578                 xw.state &= ~WIN_VISIBLE;
3579         } else if(!(xw.state & WIN_VISIBLE)) {
3580                 /* need a full redraw for next Expose, not just a buf copy */
3581                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3582         }
3583 }
3584
3585 void
3586 unmap(XEvent *ev) {
3587         xw.state &= ~WIN_VISIBLE;
3588 }
3589
3590 void
3591 xsetpointermotion(int set) {
3592         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3593         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3594 }
3595
3596 void
3597 xseturgency(int add) {
3598         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3599
3600         MODBIT(h->flags, add, XUrgencyHint);
3601         XSetWMHints(xw.dpy, xw.win, h);
3602         XFree(h);
3603 }
3604
3605 void
3606 focus(XEvent *ev) {
3607         XFocusChangeEvent *e = &ev->xfocus;
3608
3609         if(e->mode == NotifyGrab)
3610                 return;
3611
3612         if(ev->type == FocusIn) {
3613                 XSetICFocus(xw.xic);
3614                 xw.state |= WIN_FOCUSED;
3615                 xseturgency(0);
3616                 if(IS_SET(MODE_FOCUS))
3617                         ttywrite("\033[I", 3);
3618         } else {
3619                 XUnsetICFocus(xw.xic);
3620                 xw.state &= ~WIN_FOCUSED;
3621                 if(IS_SET(MODE_FOCUS))
3622                         ttywrite("\033[O", 3);
3623         }
3624 }
3625
3626 static inline bool
3627 match(uint mask, uint state) {
3628         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3629 }
3630
3631 void
3632 numlock(const Arg *dummy) {
3633         term.numlock ^= 1;
3634 }
3635
3636 char*
3637 kmap(KeySym k, uint state) {
3638         Key *kp;
3639         int i;
3640
3641         /* Check for mapped keys out of X11 function keys. */
3642         for(i = 0; i < LEN(mappedkeys); i++) {
3643                 if(mappedkeys[i] == k)
3644                         break;
3645         }
3646         if(i == LEN(mappedkeys)) {
3647                 if((k & 0xFFFF) < 0xFD00)
3648                         return NULL;
3649         }
3650
3651         for(kp = key; kp < key + LEN(key); kp++) {
3652                 if(kp->k != k)
3653                         continue;
3654
3655                 if(!match(kp->mask, state))
3656                         continue;
3657
3658                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3659                         continue;
3660                 if(term.numlock && kp->appkey == 2)
3661                         continue;
3662
3663                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3664                         continue;
3665
3666                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3667                         continue;
3668
3669                 return kp->s;
3670         }
3671
3672         return NULL;
3673 }
3674
3675 void
3676 kpress(XEvent *ev) {
3677         XKeyEvent *e = &ev->xkey;
3678         KeySym ksym;
3679         char buf[32], *customkey;
3680         int len;
3681         long c;
3682         Status status;
3683         Shortcut *bp;
3684
3685         if(IS_SET(MODE_KBDLOCK))
3686                 return;
3687
3688         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3689         /* 1. shortcuts */
3690         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3691                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3692                         bp->func(&(bp->arg));
3693                         return;
3694                 }
3695         }
3696
3697         /* 2. custom keys from config.h */
3698         if((customkey = kmap(ksym, e->state))) {
3699                 ttysend(customkey, strlen(customkey));
3700                 return;
3701         }
3702
3703         /* 3. composed string from input method */
3704         if(len == 0)
3705                 return;
3706         if(len == 1 && e->state & Mod1Mask) {
3707                 if(IS_SET(MODE_8BIT)) {
3708                         if(*buf < 0177) {
3709                                 c = *buf | 0x80;
3710                                 len = utf8encode(c, buf, UTF_SIZ);
3711                         }
3712                 } else {
3713                         buf[1] = buf[0];
3714                         buf[0] = '\033';
3715                         len = 2;
3716                 }
3717         }
3718         ttysend(buf, len);
3719 }
3720
3721
3722 void
3723 cmessage(XEvent *e) {
3724         /*
3725          * See xembed specs
3726          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3727          */
3728         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3729                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3730                         xw.state |= WIN_FOCUSED;
3731                         xseturgency(0);
3732                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3733                         xw.state &= ~WIN_FOCUSED;
3734                 }
3735         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3736                 /* Send SIGHUP to shell */
3737                 kill(pid, SIGHUP);
3738                 exit(EXIT_SUCCESS);
3739         }
3740 }
3741
3742 void
3743 cresize(int width, int height) {
3744         int col, row;
3745
3746         if(width != 0)
3747                 xw.w = width;
3748         if(height != 0)
3749                 xw.h = height;
3750
3751         col = (xw.w - 2 * borderpx) / xw.cw;
3752         row = (xw.h - 2 * borderpx) / xw.ch;
3753
3754         tresize(col, row);
3755         xresize(col, row);
3756         ttyresize();
3757 }
3758
3759 void
3760 resize(XEvent *e) {
3761         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3762                 return;
3763
3764         cresize(e->xconfigure.width, e->xconfigure.height);
3765 }
3766
3767 void
3768 run(void) {
3769         XEvent ev;
3770         int w = xw.w, h = xw.h;
3771         fd_set rfd;
3772         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3773         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3774         long deltatime;
3775
3776         /* Waiting for window mapping */
3777         while(1) {
3778                 XNextEvent(xw.dpy, &ev);
3779                 if(XFilterEvent(&ev, None))
3780                         continue;
3781                 if(ev.type == ConfigureNotify) {
3782                         w = ev.xconfigure.width;
3783                         h = ev.xconfigure.height;
3784                 } else if(ev.type == MapNotify) {
3785                         break;
3786                 }
3787         }
3788
3789         ttynew();
3790         cresize(w, h);
3791
3792         clock_gettime(CLOCK_MONOTONIC, &last);
3793         lastblink = last;
3794
3795         for(xev = actionfps;;) {
3796                 FD_ZERO(&rfd);
3797                 FD_SET(cmdfd, &rfd);
3798                 FD_SET(xfd, &rfd);
3799
3800                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3801                         if(errno == EINTR)
3802                                 continue;
3803                         die("select failed: %s\n", strerror(errno));
3804                 }
3805                 if(FD_ISSET(cmdfd, &rfd)) {
3806                         ttyread();
3807                         if(blinktimeout) {
3808                                 blinkset = tattrset(ATTR_BLINK);
3809                                 if(!blinkset)
3810                                         MODBIT(term.mode, 0, MODE_BLINK);
3811                         }
3812                 }
3813
3814                 if(FD_ISSET(xfd, &rfd))
3815                         xev = actionfps;
3816
3817                 clock_gettime(CLOCK_MONOTONIC, &now);
3818                 drawtimeout.tv_sec = 0;
3819                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3820                 tv = &drawtimeout;
3821
3822                 dodraw = 0;
3823                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3824                         tsetdirtattr(ATTR_BLINK);
3825                         term.mode ^= MODE_BLINK;
3826                         lastblink = now;
3827                         dodraw = 1;
3828                 }
3829                 deltatime = TIMEDIFF(now, last);
3830                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3831                                 || deltatime < 0) {
3832                         dodraw = 1;
3833                         last = now;
3834                 }
3835
3836                 if(dodraw) {
3837                         while(XPending(xw.dpy)) {
3838                                 XNextEvent(xw.dpy, &ev);
3839                                 if(XFilterEvent(&ev, None))
3840                                         continue;
3841                                 if(handler[ev.type])
3842                                         (handler[ev.type])(&ev);
3843                         }
3844
3845                         draw();
3846                         XFlush(xw.dpy);
3847
3848                         if(xev && !FD_ISSET(xfd, &rfd))
3849                                 xev--;
3850                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3851                                 if(blinkset) {
3852                                         if(TIMEDIFF(now, lastblink) \
3853                                                         > blinktimeout) {
3854                                                 drawtimeout.tv_nsec = 1000;
3855                                         } else {
3856                                                 drawtimeout.tv_nsec = (1E6 * \
3857                                                         (blinktimeout - \
3858                                                         TIMEDIFF(now,
3859                                                                 lastblink)));
3860                                         }
3861                                 } else {
3862                                         tv = NULL;
3863                                 }
3864                         }
3865                 }
3866         }
3867 }
3868
3869 void
3870 usage(void) {
3871         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3872         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3873         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3874 }
3875
3876 int
3877 main(int argc, char *argv[]) {
3878         char *titles;
3879         uint cols = 80, rows = 24;
3880
3881         xw.l = xw.t = 0;
3882         xw.isfixed = False;
3883
3884         ARGBEGIN {
3885         case 'a':
3886                 allowaltscreen = false;
3887                 break;
3888         case 'c':
3889                 opt_class = EARGF(usage());
3890                 break;
3891         case 'e':
3892                 /* eat all remaining arguments */
3893                 if(argc > 1) {
3894                         opt_cmd = &argv[1];
3895                         if(argv[1] != NULL && opt_title == NULL) {
3896                                 titles = xstrdup(argv[1]);
3897                                 opt_title = basename(titles);
3898                         }
3899                 }
3900                 goto run;
3901         case 'f':
3902                 opt_font = EARGF(usage());
3903                 break;
3904         case 'g':
3905                 xw.gm = XParseGeometry(EARGF(usage()),
3906                                 &xw.l, &xw.t, &cols, &rows);
3907                 break;
3908         case 'i':
3909                 xw.isfixed = True;
3910                 break;
3911         case 'o':
3912                 opt_io = EARGF(usage());
3913                 break;
3914         case 't':
3915                 opt_title = EARGF(usage());
3916                 break;
3917         case 'w':
3918                 opt_embed = EARGF(usage());
3919                 break;
3920         case 'v':
3921         default:
3922                 usage();
3923         } ARGEND;
3924
3925 run:
3926         setlocale(LC_CTYPE, "");
3927         XSetLocaleModifiers("");
3928         tnew(cols? cols : 1, rows? rows : 1);
3929         xinit();
3930         selinit();
3931         run();
3932
3933         return 0;
3934 }
3935