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_FASTBLINK = 32,
  99         ATTR_REVERSE   = 64,
 100         ATTR_INVISIBLE = 128,
 101         ATTR_STRUCK    = 256,
 102         ATTR_WRAP      = 512,
 103         ATTR_WIDE      = 1024,
 104         ATTR_WDUMMY    = 2048,
 105 };
 106
 107 enum cursor_movement {
 108         CURSOR_SAVE,
 109         CURSOR_LOAD
 110 };
 111
 112 enum cursor_state {
 113         CURSOR_DEFAULT  = 0,
 114         CURSOR_WRAPNEXT = 1,
 115         CURSOR_ORIGIN   = 2
 116 };
 117
 118 enum term_mode {
 119         MODE_WRAP        = 1,
 120         MODE_INSERT      = 2,
 121         MODE_APPKEYPAD   = 4,
 122         MODE_ALTSCREEN   = 8,
 123         MODE_CRLF        = 16,
 124         MODE_MOUSEBTN    = 32,
 125         MODE_MOUSEMOTION = 64,
 126         MODE_REVERSE     = 128,
 127         MODE_KBDLOCK     = 256,
 128         MODE_HIDE        = 512,
 129         MODE_ECHO        = 1024,
 130         MODE_APPCURSOR   = 2048,
 131         MODE_MOUSESGR    = 4096,
 132         MODE_8BIT        = 8192,
 133         MODE_BLINK       = 16384,
 134         MODE_FBLINK      = 32768,
 135         MODE_FOCUS       = 65536,
 136         MODE_MOUSEX10    = 131072,
 137         MODE_MOUSEMANY   = 262144,
 138         MODE_BRCKTPASTE  = 524288,
 139         MODE_PRINT       = 1048576,
 140         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 141                           |MODE_MOUSEMANY,
 142 };
 143
 144 enum charset {
 145         CS_GRAPHIC0,
 146         CS_GRAPHIC1,
 147         CS_UK,
 148         CS_USA,
 149         CS_MULTI,
 150         CS_GER,
 151         CS_FIN
 152 };
 153
 154 enum escape_state {
 155         ESC_START      = 1,
 156         ESC_CSI        = 2,
 157         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 158         ESC_ALTCHARSET = 8,
 159         ESC_STR_END    = 16, /* a final string was encountered */
 160         ESC_TEST       = 32, /* Enter in test mode */
 161 };
 162
 163 enum window_state {
 164         WIN_VISIBLE = 1,
 165         WIN_REDRAW  = 2,
 166         WIN_FOCUSED = 4
 167 };
 168
 169 enum selection_type {
 170         SEL_REGULAR = 1,
 171         SEL_RECTANGULAR = 2
 172 };
 173
 174 enum selection_snap {
 175         SNAP_WORD = 1,
 176         SNAP_LINE = 2
 177 };
 178
 179 typedef unsigned char uchar;
 180 typedef unsigned int uint;
 181 typedef unsigned long ulong;
 182 typedef unsigned short ushort;
 183
 184 typedef XftDraw *Draw;
 185 typedef XftColor Color;
 186
 187 typedef struct {
 188         char c[UTF_SIZ]; /* character code */
 189         ushort mode;      /* attribute flags */
 190         uint32_t fg;      /* foreground  */
 191         uint32_t bg;      /* background  */
 192 } Glyph;
 193
 194 typedef Glyph *Line;
 195
 196 typedef struct {
 197         Glyph attr; /* current char attributes */
 198         int x;
 199         int y;
 200         char state;
 201 } TCursor;
 202
 203 /* CSI Escape sequence structs */
 204 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 205 typedef struct {
 206         char buf[ESC_BUF_SIZ]; /* raw string */
 207         int len;               /* raw string length */
 208         char priv;
 209         int arg[ESC_ARG_SIZ];
 210         int narg;              /* nb of args */
 211         char mode;
 212 } CSIEscape;
 213
 214 /* STR Escape sequence structs */
 215 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 216 typedef struct {
 217         char type;             /* ESC type ... */
 218         char buf[STR_BUF_SIZ]; /* raw string */
 219         int len;               /* raw string length */
 220         char *args[STR_ARG_SIZ];
 221         int narg;              /* nb of args */
 222 } STREscape;
 223
 224 /* Internal representation of the screen */
 225 typedef struct {
 226         int row;      /* nb row */
 227         int col;      /* nb col */
 228         Line *line;   /* screen */
 229         Line *alt;    /* alternate screen */
 230         bool *dirty;  /* dirtyness of lines */
 231         TCursor c;    /* cursor */
 232         int top;      /* top    scroll limit */
 233         int bot;      /* bottom scroll limit */
 234         int mode;     /* terminal mode flags */
 235         int esc;      /* escape state flags */
 236         char trantbl[4]; /* charset table translation */
 237         int charset;  /* current charset */
 238         int icharset; /* selected charset for sequence */
 239         bool numlock; /* lock numbers in keyboard */
 240         bool *tabs;
 241 } Term;
 242
 243 /* Purely graphic info */
 244 typedef struct {
 245         Display *dpy;
 246         Colormap cmap;
 247         Window win;
 248         Drawable buf;
 249         Atom xembed, wmdeletewin, netwmname, netwmpid;
 250         XIM xim;
 251         XIC xic;
 252         Draw draw;
 253         Visual *vis;
 254         XSetWindowAttributes attrs;
 255         int scr;
 256         bool isfixed; /* is fixed geometry? */
 257         int l, t; /* left and top offset */
 258         int gm; /* geometry mask */
 259         int tw, th; /* tty width and height */
 260         int w, h; /* window width and height */
 261         int ch; /* char height */
 262         int cw; /* char width  */
 263         char state; /* focus, redraw, visible */
 264 } XWindow;
 265
 266 typedef struct {
 267         uint b;
 268         uint mask;
 269         char *s;
 270 } Mousekey;
 271
 272 typedef struct {
 273         KeySym k;
 274         uint mask;
 275         char *s;
 276         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 277         signed char appkey;    /* application keypad */
 278         signed char appcursor; /* application cursor */
 279         signed char crlf;      /* crlf mode          */
 280 } Key;
 281
 282 typedef struct {
 283         int mode;
 284         int type;
 285         int snap;
 286         /*
 287          * Selection variables:
 288          * nb – normalized coordinates of the beginning of the selection
 289          * ne – normalized coordinates of the end of the selection
 290          * ob – original coordinates of the beginning of the selection
 291          * oe – original coordinates of the end of the selection
 292          */
 293         struct {
 294                 int x, y;
 295         } nb, ne, ob, oe;
 296
 297         char *clip;
 298         Atom xtarget;
 299         bool alt;
 300         struct timespec tclick1;
 301         struct timespec tclick2;
 302 } Selection;
 303
 304 typedef union {
 305         int i;
 306         uint ui;
 307         float f;
 308         const void *v;
 309 } Arg;
 310
 311 typedef struct {
 312         uint mod;
 313         KeySym keysym;
 314         void (*func)(const Arg *);
 315         const Arg arg;
 316 } Shortcut;
 317
 318 /* function definitions used in config.h */
 319 static void clippaste(const Arg *);
 320 static void numlock(const Arg *);
 321 static void selpaste(const Arg *);
 322 static void xzoom(const Arg *);
 323 static void printsel(const Arg *);
 324 static void printscreen(const Arg *) ;
 325 static void toggleprinter(const Arg *);
 326
 327 /* Config.h for applying patches and the configuration. */
 328 #include "config.h"
 329
 330 /* Font structure */
 331 typedef struct {
 332         int height;
 333         int width;
 334         int ascent;
 335         int descent;
 336         short lbearing;
 337         short rbearing;
 338         XftFont *match;
 339         FcFontSet *set;
 340         FcPattern *pattern;
 341 } Font;
 342
 343 /* Drawing Context */
 344 typedef struct {
 345         Color col[MAX(LEN(colorname), 256)];
 346         Font font, bfont, ifont, ibfont;
 347         GC gc;
 348 } DC;
 349
 350 static void die(const char *, ...);
 351 static void draw(void);
 352 static void redraw(int);
 353 static void drawregion(int, int, int, int);
 354 static void execsh(void);
 355 static void sigchld(int);
 356 static void run(void);
 357
 358 static void csidump(void);
 359 static void csihandle(void);
 360 static void csiparse(void);
 361 static void csireset(void);
 362 static void strdump(void);
 363 static void strhandle(void);
 364 static void strparse(void);
 365 static void strreset(void);
 366
 367 static int tattrset(int);
 368 static void tprinter(char *, size_t);
 369 static void tdumpsel(void);
 370 static void tdumpline(int);
 371 static void tdump(void);
 372 static void tclearregion(int, int, int, int);
 373 static void tcursor(int);
 374 static void tdeletechar(int);
 375 static void tdeleteline(int);
 376 static void tinsertblank(int);
 377 static void tinsertblankline(int);
 378 static int tlinelen(int);
 379 static void tmoveto(int, int);
 380 static void tmoveato(int, int);
 381 static void tnew(int, int);
 382 static void tnewline(int);
 383 static void tputtab(int);
 384 static void tputc(char *, int);
 385 static void treset(void);
 386 static int tresize(int, int);
 387 static void tscrollup(int, int);
 388 static void tscrolldown(int, int);
 389 static void tsetattr(int *, int);
 390 static void tsetchar(char *, Glyph *, int, int);
 391 static void tsetscroll(int, int);
 392 static void tswapscreen(void);
 393 static void tsetdirt(int, int);
 394 static void tsetdirtattr(int);
 395 static void tsetmode(bool, bool, int *, int);
 396 static void tfulldirt(void);
 397 static void techo(char *, int);
 398 static void tcontrolcode(uchar );
 399 static void tdectest(char );
 400 static int32_t tdefcolor(int *, int *, int);
 401 static void tdeftran(char);
 402 static inline bool match(uint, uint);
 403 static void ttynew(void);
 404 static void ttyread(void);
 405 static void ttyresize(void);
 406 static void ttysend(char *, size_t);
 407 static void ttywrite(const char *, size_t);
 408 static void tstrsequence(uchar c);
 409
 410 static void xdraws(char *, Glyph, int, int, int, int);
 411 static void xhints(void);
 412 static void xclear(int, int, int, int);
 413 static void xdrawcursor(void);
 414 static void xinit(void);
 415 static void xloadcols(void);
 416 static int xsetcolorname(int, const char *);
 417 static int xgeommasktogravity(int);
 418 static int xloadfont(Font *, FcPattern *);
 419 static void xloadfonts(char *, double);
 420 static int xloadfontset(Font *);
 421 static void xsettitle(char *);
 422 static void xresettitle(void);
 423 static void xsetpointermotion(int);
 424 static void xseturgency(int);
 425 static void xsetsel(char *);
 426 static void xtermclear(int, int, int, int);
 427 static void xunloadfont(Font *);
 428 static void xunloadfonts(void);
 429 static void xresize(int, int);
 430
 431 static void expose(XEvent *);
 432 static void visibility(XEvent *);
 433 static void unmap(XEvent *);
 434 static char *kmap(KeySym, uint);
 435 static void kpress(XEvent *);
 436 static void cmessage(XEvent *);
 437 static void cresize(int, int);
 438 static void resize(XEvent *);
 439 static void focus(XEvent *);
 440 static void brelease(XEvent *);
 441 static void bpress(XEvent *);
 442 static void bmotion(XEvent *);
 443 static void selnotify(XEvent *);
 444 static void selclear(XEvent *);
 445 static void selrequest(XEvent *);
 446
 447 static void selinit(void);
 448 static void selnormalize(void);
 449 static inline bool selected(int, int);
 450 static char *getsel(void);
 451 static void selcopy(void);
 452 static void selscroll(int, int);
 453 static void selsnap(int, int *, int *, int);
 454 static void getbuttoninfo(XEvent *);
 455 static void mousereport(XEvent *);
 456
 457 static size_t utf8decode(char *, long *, size_t);
 458 static long utf8decodebyte(char, size_t *);
 459 static size_t utf8encode(long, char *, size_t);
 460 static char utf8encodebyte(long, size_t);
 461 static size_t utf8len(char *);
 462 static size_t utf8validate(long *, size_t);
 463
 464 static ssize_t xwrite(int, const char *, size_t);
 465 static void *xmalloc(size_t);
 466 static void *xrealloc(void *, size_t);
 467 static char *xstrdup(char *);
 468
 469 static void usage(void);
 470
 471 static void (*handler[LASTEvent])(XEvent *) = {
 472         [KeyPress] = kpress,
 473         [ClientMessage] = cmessage,
 474         [ConfigureNotify] = resize,
 475         [VisibilityNotify] = visibility,
 476         [UnmapNotify] = unmap,
 477         [Expose] = expose,
 478         [FocusIn] = focus,
 479         [FocusOut] = focus,
 480         [MotionNotify] = bmotion,
 481         [ButtonPress] = bpress,
 482         [ButtonRelease] = brelease,
 483         [SelectionClear] = selclear,
 484         [SelectionNotify] = selnotify,
 485         [SelectionRequest] = selrequest,
 486 };
 487
 488 /* Globals */
 489 static DC dc;
 490 static XWindow xw;
 491 static Term term;
 492 static CSIEscape csiescseq;
 493 static STREscape strescseq;
 494 static int cmdfd;
 495 static pid_t pid;
 496 static Selection sel;
 497 static int iofd = STDOUT_FILENO;
 498 static char **opt_cmd = NULL;
 499 static char *opt_io = NULL;
 500 static char *opt_title = NULL;
 501 static char *opt_embed = NULL;
 502 static char *opt_class = NULL;
 503 static char *opt_font = NULL;
 504 static int oldbutton = 3; /* button event on startup: 3 = release */
 505
 506 static char *usedfont = NULL;
 507 static double usedfontsize = 0;
 508
 509 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 510 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 511 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 512 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 513
 514 /* Font Ring Cache */
 515 enum {
 516         FRC_NORMAL,
 517         FRC_ITALIC,
 518         FRC_BOLD,
 519         FRC_ITALICBOLD
 520 };
 521
 522 typedef struct {
 523         XftFont *font;
 524         int flags;
 525 } Fontcache;
 526
 527 /* Fontcache is an array now. A new font will be appended to the array. */
 528 static Fontcache frc[16];
 529 static int frclen = 0;
 530
 531 ssize_t
 532 xwrite(int fd, const char *s, size_t len) {
 533         size_t aux = len;
 534
 535         while(len > 0) {
 536                 ssize_t r = write(fd, s, len);
 537                 if(r < 0)
 538                         return r;
 539                 len -= r;
 540                 s += r;
 541         }
 542         return aux;
 543 }
 544
 545 void *
 546 xmalloc(size_t len) {
 547         void *p = malloc(len);
 548
 549         if(!p)
 550                 die("Out of memory\n");
 551
 552         return p;
 553 }
 554
 555 void *
 556 xrealloc(void *p, size_t len) {
 557         if((p = realloc(p, len)) == NULL)
 558                 die("Out of memory\n");
 559
 560         return p;
 561 }
 562
 563 char *
 564 xstrdup(char *s) {
 565         if((s = strdup(s)) == NULL)
 566                 die("Out of memory\n");
 567
 568         return s;
 569 }
 570
 571 size_t
 572 utf8decode(char *c, long *u, size_t clen) {
 573         size_t i, j, len, type;
 574         long udecoded;
 575
 576         *u = UTF_INVALID;
 577         if(!clen)
 578                 return 0;
 579         udecoded = utf8decodebyte(c[0], &len);
 580         if(!BETWEEN(len, 1, UTF_SIZ))
 581                 return 1;
 582         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 583                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 584                 if(type != 0)
 585                         return j;
 586         }
 587         if(j < len)
 588                 return 0;
 589         *u = udecoded;
 590         utf8validate(u, len);
 591         return len;
 592 }
 593
 594 long
 595 utf8decodebyte(char c, size_t *i) {
 596         for(*i = 0; *i < LEN(utfmask); ++(*i))
 597                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 598                         return (uchar)c & ~utfmask[*i];
 599         return 0;
 600 }
 601
 602 size_t
 603 utf8encode(long u, char *c, size_t clen) {
 604         size_t len, i;
 605
 606         len = utf8validate(&u, 0);
 607         if(clen < len)
 608                 return 0;
 609         for(i = len - 1; i != 0; --i) {
 610                 c[i] = utf8encodebyte(u, 0);
 611                 u >>= 6;
 612         }
 613         c[0] = utf8encodebyte(u, len);
 614         return len;
 615 }
 616
 617 char
 618 utf8encodebyte(long u, size_t i) {
 619         return utfbyte[i] | (u & ~utfmask[i]);
 620 }
 621
 622 size_t
 623 utf8len(char *c) {
 624         return utf8decode(c, &(long){0}, UTF_SIZ);
 625 }
 626
 627 size_t
 628 utf8validate(long *u, size_t i) {
 629         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 630                 *u = UTF_INVALID;
 631         for(i = 1; *u > utfmax[i]; ++i)
 632                 ;
 633         return i;
 634 }
 635
 636 static void
 637 selinit(void) {
 638         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 639         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 640         sel.mode = 0;
 641         sel.ob.x = -1;
 642         sel.clip = NULL;
 643         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 644         if(sel.xtarget == None)
 645                 sel.xtarget = XA_STRING;
 646 }
 647
 648 static int
 649 x2col(int x) {
 650         x -= borderpx;
 651         x /= xw.cw;
 652
 653         return LIMIT(x, 0, term.col-1);
 654 }
 655
 656 static int
 657 y2row(int y) {
 658         y -= borderpx;
 659         y /= xw.ch;
 660
 661         return LIMIT(y, 0, term.row-1);
 662 }
 663
 664 static int tlinelen(int y) {
 665         int i = term.col;
 666
 667         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 668                 --i;
 669
 670         return i;
 671 }
 672
 673 static void
 674 selnormalize(void) {
 675         int i;
 676
 677         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 678                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 679                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 680         } else {
 681                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 682                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 683         }
 684         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 685         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 686
 687         /* expand selection over line breaks */
 688         if (sel.type == SEL_RECTANGULAR)
 689                 return;
 690         i = tlinelen(sel.nb.y);
 691         if (i < sel.nb.x)
 692                 sel.nb.x = i;
 693         if (tlinelen(sel.ne.y) <= sel.ne.x)
 694                 sel.ne.x = term.col - 1;
 695 }
 696
 697 static inline bool
 698 selected(int x, int y) {
 699         if(sel.type == SEL_RECTANGULAR)
 700                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 701                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 702
 703         return BETWEEN(y, sel.nb.y, sel.ne.y)
 704             && (y != sel.nb.y || x >= sel.nb.x)
 705             && (y != sel.ne.y || x <= sel.ne.x);
 706 }
 707
 708 void
 709 selsnap(int mode, int *x, int *y, int direction) {
 710         int newx, newy, xt, yt;
 711         Glyph *gp;
 712
 713         switch(mode) {
 714         case SNAP_WORD:
 715                 /*
 716                  * Snap around if the word wraps around at the end or
 717                  * beginning of a line.
 718                  */
 719                 for(;;) {
 720                         newx = *x + direction;
 721                         newy = *y;
 722                         if(!BETWEEN(newx, 0, term.col - 1)) {
 723                                 newy += direction;
 724                                 newx = (newx + term.col) % term.col;
 725                                 if (!BETWEEN(newy, 0, term.row - 1))
 726                                         break;
 727
 728                                 if(direction > 0)
 729                                         yt = *y, xt = *x;
 730                                 else
 731                                         yt = newy, xt = newx;
 732                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 733                                         break;
 734                         }
 735
 736                         if (newx >= tlinelen(newy))
 737                                 break;
 738
 739                         gp = &term.line[newy][newx];
 740                         if (!(gp->mode & ATTR_WDUMMY) && strchr(worddelimiters, gp->c[0]))
 741                                 break;
 742
 743                         *x = newx;
 744                         *y = newy;
 745                 }
 746                 break;
 747         case SNAP_LINE:
 748                 /*
 749                  * Snap around if the the previous line or the current one
 750                  * has set ATTR_WRAP at its end. Then the whole next or
 751                  * previous line will be selected.
 752                  */
 753                 *x = (direction < 0) ? 0 : term.col - 1;
 754                 if(direction < 0 && *y > 0) {
 755                         for(; *y > 0; *y += direction) {
 756                                 if(!(term.line[*y-1][term.col-1].mode
 757                                                 & ATTR_WRAP)) {
 758                                         break;
 759                                 }
 760                         }
 761                 } else if(direction > 0 && *y < term.row-1) {
 762                         for(; *y < term.row; *y += direction) {
 763                                 if(!(term.line[*y][term.col-1].mode
 764                                                 & ATTR_WRAP)) {
 765                                         break;
 766                                 }
 767                         }
 768                 }
 769                 break;
 770         }
 771 }
 772
 773 void
 774 getbuttoninfo(XEvent *e) {
 775         int type;
 776         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 777
 778         sel.alt = IS_SET(MODE_ALTSCREEN);
 779
 780         sel.oe.x = x2col(e->xbutton.x);
 781         sel.oe.y = y2row(e->xbutton.y);
 782
 783         if(sel.ob.y < sel.oe.y
 784                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 785                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 786                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 787         } else {
 788                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 789                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 790         }
 791         selnormalize();
 792
 793         sel.type = SEL_REGULAR;
 794         for(type = 1; type < LEN(selmasks); ++type) {
 795                 if(match(selmasks[type], state)) {
 796                         sel.type = type;
 797                         break;
 798                 }
 799         }
 800 }
 801
 802 void
 803 mousereport(XEvent *e) {
 804         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 805             button = e->xbutton.button, state = e->xbutton.state,
 806             len;
 807         char buf[40];
 808         static int ox, oy;
 809
 810         /* from urxvt */
 811         if(e->xbutton.type == MotionNotify) {
 812                 if(x == ox && y == oy)
 813                         return;
 814                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 815                         return;
 816                 /* MOUSE_MOTION: no reporting if no button is pressed */
 817                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 818                         return;
 819
 820                 button = oldbutton + 32;
 821                 ox = x;
 822                 oy = y;
 823         } else {
 824                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 825                         button = 3;
 826                 } else {
 827                         button -= Button1;
 828                         if(button >= 3)
 829                                 button += 64 - 3;
 830                 }
 831                 if(e->xbutton.type == ButtonPress) {
 832                         oldbutton = button;
 833                         ox = x;
 834                         oy = y;
 835                 } else if(e->xbutton.type == ButtonRelease) {
 836                         oldbutton = 3;
 837                         /* MODE_MOUSEX10: no button release reporting */
 838                         if(IS_SET(MODE_MOUSEX10))
 839                                 return;
 840                         if (button == 64 || button == 65)
 841                                 return;
 842                 }
 843         }
 844
 845         if(!IS_SET(MODE_MOUSEX10)) {
 846                 button += (state & ShiftMask   ? 4  : 0)
 847                         + (state & Mod4Mask    ? 8  : 0)
 848                         + (state & ControlMask ? 16 : 0);
 849         }
 850
 851         len = 0;
 852         if(IS_SET(MODE_MOUSESGR)) {
 853                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 854                                 button, x+1, y+1,
 855                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 856         } else if(x < 223 && y < 223) {
 857                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 858                                 32+button, 32+x+1, 32+y+1);
 859         } else {
 860                 return;
 861         }
 862
 863         ttywrite(buf, len);
 864 }
 865
 866 void
 867 bpress(XEvent *e) {
 868         struct timespec now;
 869         Mousekey *mk;
 870
 871         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 872                 mousereport(e);
 873                 return;
 874         }
 875
 876         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 877                 if(e->xbutton.button == mk->b
 878                                 && match(mk->mask, e->xbutton.state)) {
 879                         ttysend(mk->s, strlen(mk->s));
 880                         return;
 881                 }
 882         }
 883
 884         if(e->xbutton.button == Button1) {
 885                 clock_gettime(CLOCK_MONOTONIC, &now);
 886
 887                 /* Clear previous selection, logically and visually. */
 888                 selclear(NULL);
 889                 sel.mode = 1;
 890                 sel.type = SEL_REGULAR;
 891                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 892                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 893
 894                 /*
 895                  * If the user clicks below predefined timeouts specific
 896                  * snapping behaviour is exposed.
 897                  */
 898                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 899                         sel.snap = SNAP_LINE;
 900                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 901                         sel.snap = SNAP_WORD;
 902                 } else {
 903                         sel.snap = 0;
 904                 }
 905                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 906                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 907                 selnormalize();
 908
 909                 /*
 910                  * Draw selection, unless it's regular and we don't want to
 911                  * make clicks visible
 912                  */
 913                 if(sel.snap != 0) {
 914                         sel.mode++;
 915                         tsetdirt(sel.nb.y, sel.ne.y);
 916                 }
 917                 sel.tclick2 = sel.tclick1;
 918                 sel.tclick1 = now;
 919         }
 920 }
 921
 922 char *
 923 getsel(void) {
 924         char *str, *ptr;
 925         int y, bufsize, size, lastx, linelen;
 926         Glyph *gp, *last;
 927
 928         if(sel.ob.x == -1)
 929                 return NULL;
 930
 931         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 932         ptr = str = xmalloc(bufsize);
 933
 934         /* append every set & selected glyph to the selection */
 935         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 936                 linelen = tlinelen(y);
 937
 938                 if(sel.type == SEL_RECTANGULAR) {
 939                         gp = &term.line[y][sel.nb.x];
 940                         lastx = sel.ne.x;
 941                 } else {
 942                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 943                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 944                 }
 945                 last = &term.line[y][MIN(lastx, linelen-1)];
 946
 947                 for( ; gp <= last; ++gp) {
 948                         if(gp->mode & ATTR_WDUMMY)
 949                                 continue;
 950
 951                         size = utf8len(gp->c);
 952                         memcpy(ptr, gp->c, size);
 953                         ptr += size;
 954                 }
 955
 956                 /*
 957                  * Copy and pasting of line endings is inconsistent
 958                  * in the inconsistent terminal and GUI world.
 959                  * The best solution seems like to produce '\n' when
 960                  * something is copied from st and convert '\n' to
 961                  * '\r', when something to be pasted is received by
 962                  * st.
 963                  * FIXME: Fix the computer world.
 964                  */
 965                 if(sel.ne.y > y || lastx >= linelen)
 966                         *ptr++ = '\n';
 967         }
 968         *ptr = 0;
 969         return str;
 970 }
 971
 972 void
 973 selcopy(void) {
 974         xsetsel(getsel());
 975 }
 976
 977 void
 978 selnotify(XEvent *e) {
 979         ulong nitems, ofs, rem;
 980         int format;
 981         uchar *data, *last, *repl;
 982         Atom type;
 983
 984         ofs = 0;
 985         do {
 986                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 987                                         False, AnyPropertyType, &type, &format,
 988                                         &nitems, &rem, &data)) {
 989                         fprintf(stderr, "Clipboard allocation failed\n");
 990                         return;
 991                 }
 992
 993                 /*
 994                  * As seen in getsel:
 995                  * Line endings are inconsistent in the terminal and GUI world
 996                  * copy and pasting. When receiving some selection data,
 997                  * replace all '\n' with '\r'.
 998                  * FIXME: Fix the computer world.
 999                  */
1000                 repl = data;
1001                 last = data + nitems * format / 8;
1002                 while((repl = memchr(repl, '\n', last - repl))) {
1003                         *repl++ = '\r';
1004                 }
1005
1006                 if(IS_SET(MODE_BRCKTPASTE))
1007                         ttywrite("\033[200~", 6);
1008                 ttysend((char *)data, nitems * format / 8);
1009                 if(IS_SET(MODE_BRCKTPASTE))
1010                         ttywrite("\033[201~", 6);
1011                 XFree(data);
1012                 /* number of 32-bit chunks returned */
1013                 ofs += nitems * format / 32;
1014         } while(rem > 0);
1015 }
1016
1017 void
1018 selpaste(const Arg *dummy) {
1019         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1020                         xw.win, CurrentTime);
1021 }
1022
1023 void
1024 clippaste(const Arg *dummy) {
1025         Atom clipboard;
1026
1027         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1028         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1029                         xw.win, CurrentTime);
1030 }
1031
1032 void
1033 selclear(XEvent *e) {
1034         if(sel.ob.x == -1)
1035                 return;
1036         sel.ob.x = -1;
1037         tsetdirt(sel.nb.y, sel.ne.y);
1038 }
1039
1040 void
1041 selrequest(XEvent *e) {
1042         XSelectionRequestEvent *xsre;
1043         XSelectionEvent xev;
1044         Atom xa_targets, string;
1045
1046         xsre = (XSelectionRequestEvent *) e;
1047         xev.type = SelectionNotify;
1048         xev.requestor = xsre->requestor;
1049         xev.selection = xsre->selection;
1050         xev.target = xsre->target;
1051         xev.time = xsre->time;
1052         /* reject */
1053         xev.property = None;
1054
1055         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1056         if(xsre->target == xa_targets) {
1057                 /* respond with the supported type */
1058                 string = sel.xtarget;
1059                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1060                                 XA_ATOM, 32, PropModeReplace,
1061                                 (uchar *) &string, 1);
1062                 xev.property = xsre->property;
1063         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1064                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1065                                 xsre->target, 8, PropModeReplace,
1066                                 (uchar *) sel.clip, strlen(sel.clip));
1067                 xev.property = xsre->property;
1068         }
1069
1070         /* all done, send a notification to the listener */
1071         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1072                 fprintf(stderr, "Error sending SelectionNotify event\n");
1073 }
1074
1075 void
1076 xsetsel(char *str) {
1077         /* register the selection for both the clipboard and the primary */
1078         Atom clipboard;
1079
1080         free(sel.clip);
1081         sel.clip = str;
1082
1083         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1084
1085         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1086         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1087 }
1088
1089 void
1090 brelease(XEvent *e) {
1091         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1092                 mousereport(e);
1093                 return;
1094         }
1095
1096         if(e->xbutton.button == Button2) {
1097                 selpaste(NULL);
1098         } else if(e->xbutton.button == Button1) {
1099                 if(sel.mode < 2) {
1100                         selclear(NULL);
1101                 } else {
1102                         getbuttoninfo(e);
1103                         selcopy();
1104                 }
1105                 sel.mode = 0;
1106                 tsetdirt(sel.nb.y, sel.ne.y);
1107         }
1108 }
1109
1110 void
1111 bmotion(XEvent *e) {
1112         int oldey, oldex, oldsby, oldsey;
1113
1114         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1115                 mousereport(e);
1116                 return;
1117         }
1118
1119         if(!sel.mode)
1120                 return;
1121
1122         sel.mode++;
1123         oldey = sel.oe.y;
1124         oldex = sel.oe.x;
1125         oldsby = sel.nb.y;
1126         oldsey = sel.ne.y;
1127         getbuttoninfo(e);
1128
1129         if(oldey != sel.oe.y || oldex != sel.oe.x)
1130                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1131 }
1132
1133 void
1134 die(const char *errstr, ...) {
1135         va_list ap;
1136
1137         va_start(ap, errstr);
1138         vfprintf(stderr, errstr, ap);
1139         va_end(ap);
1140         exit(EXIT_FAILURE);
1141 }
1142
1143 void
1144 execsh(void) {
1145         char **args;
1146         char *envshell = getenv("SHELL");
1147         const struct passwd *pass = getpwuid(getuid());
1148         char buf[sizeof(long) * 8 + 1];
1149
1150         unsetenv("COLUMNS");
1151         unsetenv("LINES");
1152         unsetenv("TERMCAP");
1153
1154         if(pass) {
1155                 setenv("LOGNAME", pass->pw_name, 1);
1156                 setenv("USER", pass->pw_name, 1);
1157                 setenv("SHELL", pass->pw_shell, 0);
1158                 setenv("HOME", pass->pw_dir, 0);
1159         }
1160
1161         snprintf(buf, sizeof(buf), "%lu", xw.win);
1162         setenv("WINDOWID", buf, 1);
1163
1164         signal(SIGCHLD, SIG_DFL);
1165         signal(SIGHUP, SIG_DFL);
1166         signal(SIGINT, SIG_DFL);
1167         signal(SIGQUIT, SIG_DFL);
1168         signal(SIGTERM, SIG_DFL);
1169         signal(SIGALRM, SIG_DFL);
1170
1171         DEFAULT(envshell, shell);
1172         setenv("TERM", termname, 1);
1173         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1174         execvp(args[0], args);
1175         exit(EXIT_FAILURE);
1176 }
1177
1178 void
1179 sigchld(int a) {
1180         int stat = 0;
1181
1182         if(waitpid(pid, &stat, 0) < 0)
1183                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1184
1185         if(WIFEXITED(stat)) {
1186                 exit(WEXITSTATUS(stat));
1187         } else {
1188                 exit(EXIT_FAILURE);
1189         }
1190 }
1191
1192 void
1193 ttynew(void) {
1194         int m, s;
1195         struct winsize w = {term.row, term.col, 0, 0};
1196
1197         /* seems to work fine on linux, openbsd and freebsd */
1198         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1199                 die("openpty failed: %s\n", strerror(errno));
1200
1201         switch(pid = fork()) {
1202         case -1:
1203                 die("fork failed\n");
1204                 break;
1205         case 0:
1206                 setsid(); /* create a new process group */
1207                 dup2(s, STDIN_FILENO);
1208                 dup2(s, STDOUT_FILENO);
1209                 dup2(s, STDERR_FILENO);
1210                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1211                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1212                 close(s);
1213                 close(m);
1214                 execsh();
1215                 break;
1216         default:
1217                 close(s);
1218                 cmdfd = m;
1219                 signal(SIGCHLD, sigchld);
1220                 if(opt_io) {
1221                         term.mode |= MODE_PRINT;
1222                         iofd = (!strcmp(opt_io, "-")) ?
1223                                   STDOUT_FILENO :
1224                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1225                         if(iofd < 0) {
1226                                 fprintf(stderr, "Error opening %s:%s\n",
1227                                         opt_io, strerror(errno));
1228                         }
1229                 }
1230                 break;
1231         }
1232 }
1233
1234 void
1235 ttyread(void) {
1236         static char buf[BUFSIZ];
1237         static int buflen = 0;
1238         char *ptr;
1239         char s[UTF_SIZ];
1240         int charsize; /* size of utf8 char in bytes */
1241         long unicodep;
1242         int ret;
1243
1244         /* append read bytes to unprocessed bytes */
1245         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1246                 die("Couldn't read from shell: %s\n", strerror(errno));
1247
1248         /* process every complete utf8 char */
1249         buflen += ret;
1250         ptr = buf;
1251         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1252                 utf8encode(unicodep, s, UTF_SIZ);
1253                 tputc(s, charsize);
1254                 ptr += charsize;
1255                 buflen -= charsize;
1256         }
1257
1258         /* keep any uncomplete utf8 char for the next call */
1259         memmove(buf, ptr, buflen);
1260 }
1261
1262 void
1263 ttywrite(const char *s, size_t n) {
1264         if(xwrite(cmdfd, s, n) == -1)
1265                 die("write error on tty: %s\n", strerror(errno));
1266 }
1267
1268 void
1269 ttysend(char *s, size_t n) {
1270         ttywrite(s, n);
1271         if(IS_SET(MODE_ECHO))
1272                 techo(s, n);
1273 }
1274
1275 void
1276 ttyresize(void) {
1277         struct winsize w;
1278
1279         w.ws_row = term.row;
1280         w.ws_col = term.col;
1281         w.ws_xpixel = xw.tw;
1282         w.ws_ypixel = xw.th;
1283         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1284                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1285 }
1286
1287 int
1288 tattrset(int attr) {
1289         int i, j;
1290
1291         for(i = 0; i < term.row-1; i++) {
1292                 for(j = 0; j < term.col-1; j++) {
1293                         if(term.line[i][j].mode & attr)
1294                                 return 1;
1295                 }
1296         }
1297
1298         return 0;
1299 }
1300
1301 void
1302 tsetdirt(int top, int bot) {
1303         int i;
1304
1305         LIMIT(top, 0, term.row-1);
1306         LIMIT(bot, 0, term.row-1);
1307
1308         for(i = top; i <= bot; i++)
1309                 term.dirty[i] = 1;
1310 }
1311
1312 void
1313 tsetdirtattr(int attr) {
1314         int i, j;
1315
1316         for(i = 0; i < term.row-1; i++) {
1317                 for(j = 0; j < term.col-1; j++) {
1318                         if(term.line[i][j].mode & attr) {
1319                                 tsetdirt(i, i);
1320                                 break;
1321                         }
1322                 }
1323         }
1324 }
1325
1326 void
1327 tfulldirt(void) {
1328         tsetdirt(0, term.row-1);
1329 }
1330
1331 void
1332 tcursor(int mode) {
1333         static TCursor c[2];
1334         bool alt = IS_SET(MODE_ALTSCREEN);
1335
1336         if(mode == CURSOR_SAVE) {
1337                 c[alt] = term.c;
1338         } else if(mode == CURSOR_LOAD) {
1339                 term.c = c[alt];
1340                 tmoveto(c[alt].x, c[alt].y);
1341         }
1342 }
1343
1344 void
1345 treset(void) {
1346         uint i;
1347
1348         term.c = (TCursor){{
1349                 .mode = ATTR_NULL,
1350                 .fg = defaultfg,
1351                 .bg = defaultbg
1352         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1353
1354         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1355         for(i = tabspaces; i < term.col; i += tabspaces)
1356                 term.tabs[i] = 1;
1357         term.top = 0;
1358         term.bot = term.row - 1;
1359         term.mode = MODE_WRAP;
1360         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1361         term.charset = 0;
1362
1363         tclearregion(0, 0, term.col-1, term.row-1);
1364         tmoveto(0, 0);
1365         tcursor(CURSOR_SAVE);
1366 }
1367
1368 void
1369 tnew(int col, int row) {
1370         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1371         tresize(col, row);
1372         term.numlock = 1;
1373
1374         treset();
1375 }
1376
1377 void
1378 tswapscreen(void) {
1379         Line *tmp = term.line;
1380
1381         term.line = term.alt;
1382         term.alt = tmp;
1383         term.mode ^= MODE_ALTSCREEN;
1384         tfulldirt();
1385 }
1386
1387 void
1388 tscrolldown(int orig, int n) {
1389         int i;
1390         Line temp;
1391
1392         LIMIT(n, 0, term.bot-orig+1);
1393
1394         tsetdirt(orig, term.bot-n);
1395         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1396
1397         for(i = term.bot; i >= orig+n; i--) {
1398                 temp = term.line[i];
1399                 term.line[i] = term.line[i-n];
1400                 term.line[i-n] = temp;
1401         }
1402
1403         selscroll(orig, n);
1404 }
1405
1406 void
1407 tscrollup(int orig, int n) {
1408         int i;
1409         Line temp;
1410
1411         LIMIT(n, 0, term.bot-orig+1);
1412
1413         tclearregion(0, orig, term.col-1, orig+n-1);
1414         tsetdirt(orig+n, term.bot);
1415
1416         for(i = orig; i <= term.bot-n; i++) {
1417                 temp = term.line[i];
1418                 term.line[i] = term.line[i+n];
1419                 term.line[i+n] = temp;
1420         }
1421
1422         selscroll(orig, -n);
1423 }
1424
1425 void
1426 selscroll(int orig, int n) {
1427         if(sel.ob.x == -1)
1428                 return;
1429
1430         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1431                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1432                         selclear(NULL);
1433                         return;
1434                 }
1435                 if(sel.type == SEL_RECTANGULAR) {
1436                         if(sel.ob.y < term.top)
1437                                 sel.ob.y = term.top;
1438                         if(sel.oe.y > term.bot)
1439                                 sel.oe.y = term.bot;
1440                 } else {
1441                         if(sel.ob.y < term.top) {
1442                                 sel.ob.y = term.top;
1443                                 sel.ob.x = 0;
1444                         }
1445                         if(sel.oe.y > term.bot) {
1446                                 sel.oe.y = term.bot;
1447                                 sel.oe.x = term.col;
1448                         }
1449                 }
1450                 selnormalize();
1451         }
1452 }
1453
1454 void
1455 tnewline(int first_col) {
1456         int y = term.c.y;
1457
1458         if(y == term.bot) {
1459                 tscrollup(term.top, 1);
1460         } else {
1461                 y++;
1462         }
1463         tmoveto(first_col ? 0 : term.c.x, y);
1464 }
1465
1466 void
1467 csiparse(void) {
1468         char *p = csiescseq.buf, *np;
1469         long int v;
1470
1471         csiescseq.narg = 0;
1472         if(*p == '?') {
1473                 csiescseq.priv = 1;
1474                 p++;
1475         }
1476
1477         csiescseq.buf[csiescseq.len] = '\0';
1478         while(p < csiescseq.buf+csiescseq.len) {
1479                 np = NULL;
1480                 v = strtol(p, &np, 10);
1481                 if(np == p)
1482                         v = 0;
1483                 if(v == LONG_MAX || v == LONG_MIN)
1484                         v = -1;
1485                 csiescseq.arg[csiescseq.narg++] = v;
1486                 p = np;
1487                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1488                         break;
1489                 p++;
1490         }
1491         csiescseq.mode = *p;
1492 }
1493
1494 /* for absolute user moves, when decom is set */
1495 void
1496 tmoveato(int x, int y) {
1497         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1498 }
1499
1500 void
1501 tmoveto(int x, int y) {
1502         int miny, maxy;
1503
1504         if(term.c.state & CURSOR_ORIGIN) {
1505                 miny = term.top;
1506                 maxy = term.bot;
1507         } else {
1508                 miny = 0;
1509                 maxy = term.row - 1;
1510         }
1511         LIMIT(x, 0, term.col-1);
1512         LIMIT(y, miny, maxy);
1513         term.c.state &= ~CURSOR_WRAPNEXT;
1514         term.c.x = x;
1515         term.c.y = y;
1516 }
1517
1518 void
1519 tsetchar(char *c, Glyph *attr, int x, int y) {
1520         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1521                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1522                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1523                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1524                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1525                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1526                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1527                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1528                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1529         };
1530
1531         /*
1532          * The table is proudly stolen from rxvt.
1533          */
1534         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1535                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1536                         c = vt100_0[c[0] - 0x41];
1537                 }
1538         }
1539
1540         if(term.line[y][x].mode & ATTR_WIDE) {
1541                 if(x+1 < term.col) {
1542                         term.line[y][x+1].c[0] = ' ';
1543                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1544                 }
1545         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1546                 term.line[y][x-1].c[0] = ' ';
1547                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1548         }
1549
1550         term.dirty[y] = 1;
1551         term.line[y][x] = *attr;
1552         memcpy(term.line[y][x].c, c, UTF_SIZ);
1553 }
1554
1555 void
1556 tclearregion(int x1, int y1, int x2, int y2) {
1557         int x, y, temp;
1558
1559         if(x1 > x2)
1560                 temp = x1, x1 = x2, x2 = temp;
1561         if(y1 > y2)
1562                 temp = y1, y1 = y2, y2 = temp;
1563
1564         LIMIT(x1, 0, term.col-1);
1565         LIMIT(x2, 0, term.col-1);
1566         LIMIT(y1, 0, term.row-1);
1567         LIMIT(y2, 0, term.row-1);
1568
1569         for(y = y1; y <= y2; y++) {
1570                 term.dirty[y] = 1;
1571                 for(x = x1; x <= x2; x++) {
1572                         if(selected(x, y))
1573                                 selclear(NULL);
1574                         term.line[y][x] = term.c.attr;
1575                         memcpy(term.line[y][x].c, " ", 2);
1576                 }
1577         }
1578 }
1579
1580 void
1581 tdeletechar(int n) {
1582         int dst, src, size;
1583         Glyph *line;
1584
1585         LIMIT(n, 0, term.col - term.c.x);
1586
1587         dst = term.c.x;
1588         src = term.c.x + n;
1589         size = term.col - src;
1590         line = term.line[term.c.y];
1591
1592         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1593         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1594 }
1595
1596 void
1597 tinsertblank(int n) {
1598         int dst, src, size;
1599         Glyph *line;
1600
1601         LIMIT(n, 0, term.col - term.c.x);
1602
1603         dst = term.c.x + n;
1604         src = term.c.x;
1605         size = term.col - dst;
1606         line = term.line[term.c.y];
1607
1608         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1609         tclearregion(src, term.c.y, dst - 1, term.c.y);
1610 }
1611
1612 void
1613 tinsertblankline(int n) {
1614         if(BETWEEN(term.c.y, term.top, term.bot))
1615                 tscrolldown(term.c.y, n);
1616 }
1617
1618 void
1619 tdeleteline(int n) {
1620         if(BETWEEN(term.c.y, term.top, term.bot))
1621                 tscrollup(term.c.y, n);
1622 }
1623
1624 int32_t
1625 tdefcolor(int *attr, int *npar, int l) {
1626         int32_t idx = -1;
1627         uint r, g, b;
1628
1629         switch (attr[*npar + 1]) {
1630         case 2: /* direct color in RGB space */
1631                 if (*npar + 4 >= l) {
1632                         fprintf(stderr,
1633                                 "erresc(38): Incorrect number of parameters (%d)\n",
1634                                 *npar);
1635                         break;
1636                 }
1637                 r = attr[*npar + 2];
1638                 g = attr[*npar + 3];
1639                 b = attr[*npar + 4];
1640                 *npar += 4;
1641                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1642                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1643                                 r, g, b);
1644                 else
1645                         idx = TRUECOLOR(r, g, b);
1646                 break;
1647         case 5: /* indexed color */
1648                 if (*npar + 2 >= l) {
1649                         fprintf(stderr,
1650                                 "erresc(38): Incorrect number of parameters (%d)\n",
1651                                 *npar);
1652                         break;
1653                 }
1654                 *npar += 2;
1655                 if(!BETWEEN(attr[*npar], 0, 255))
1656                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1657                 else
1658                         idx = attr[*npar];
1659                 break;
1660         case 0: /* implemented defined (only foreground) */
1661         case 1: /* transparent */
1662         case 3: /* direct color in CMY space */
1663         case 4: /* direct color in CMYK space */
1664         default:
1665                 fprintf(stderr,
1666                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1667                 break;
1668         }
1669
1670         return idx;
1671 }
1672
1673 void
1674 tsetattr(int *attr, int l) {
1675         int i;
1676         int32_t idx;
1677
1678         for(i = 0; i < l; i++) {
1679                 switch(attr[i]) {
1680                 case 0:
1681                         term.c.attr.mode &= ~(
1682                                 ATTR_BOLD       |
1683                                 ATTR_FAINT      |
1684                                 ATTR_ITALIC     |
1685                                 ATTR_UNDERLINE  |
1686                                 ATTR_BLINK      |
1687                                 ATTR_FASTBLINK  |
1688                                 ATTR_REVERSE    |
1689                                 ATTR_INVISIBLE  |
1690                                 ATTR_STRUCK     );
1691                         term.c.attr.fg = defaultfg;
1692                         term.c.attr.bg = defaultbg;
1693                         break;
1694                 case 1:
1695                         term.c.attr.mode |= ATTR_BOLD;
1696                         break;
1697                 case 2:
1698                         term.c.attr.mode |= ATTR_FAINT;
1699                         break;
1700                 case 3:
1701                         term.c.attr.mode |= ATTR_ITALIC;
1702                         break;
1703                 case 4:
1704                         term.c.attr.mode |= ATTR_UNDERLINE;
1705                         break;
1706                 case 5: /* slow blink */
1707                         term.c.attr.mode |= ATTR_BLINK;
1708                         break;
1709                 case 6: /* rapid blink */
1710                         term.c.attr.mode |= ATTR_FASTBLINK;
1711                         break;
1712                 case 7:
1713                         term.c.attr.mode |= ATTR_REVERSE;
1714                         break;
1715                 case 8:
1716                         term.c.attr.mode |= ATTR_INVISIBLE;
1717                         break;
1718                 case 9:
1719                         term.c.attr.mode |= ATTR_STRUCK;
1720                         break;
1721                 case 21:
1722                         term.c.attr.mode &= ~ATTR_BOLD;
1723                         break;
1724                 case 22:
1725                         term.c.attr.mode &= ~ATTR_FAINT;
1726                         break;
1727                 case 23:
1728                         term.c.attr.mode &= ~ATTR_ITALIC;
1729                         break;
1730                 case 24:
1731                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1732                         break;
1733                 case 25:
1734                         term.c.attr.mode &= ~ATTR_BLINK;
1735                         break;
1736                 case 26:
1737                         term.c.attr.mode &= ~ATTR_FASTBLINK;
1738                         break;
1739                 case 27:
1740                         term.c.attr.mode &= ~ATTR_REVERSE;
1741                         break;
1742                 case 28:
1743                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1744                         break;
1745                 case 29:
1746                         term.c.attr.mode &= ~ATTR_STRUCK;
1747                         break;
1748                 case 38:
1749                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1750                                 term.c.attr.fg = idx;
1751                         break;
1752                 case 39:
1753                         term.c.attr.fg = defaultfg;
1754                         break;
1755                 case 48:
1756                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1757                                 term.c.attr.bg = idx;
1758                         break;
1759                 case 49:
1760                         term.c.attr.bg = defaultbg;
1761                         break;
1762                 default:
1763                         if(BETWEEN(attr[i], 30, 37)) {
1764                                 term.c.attr.fg = attr[i] - 30;
1765                         } else if(BETWEEN(attr[i], 40, 47)) {
1766                                 term.c.attr.bg = attr[i] - 40;
1767                         } else if(BETWEEN(attr[i], 90, 97)) {
1768                                 term.c.attr.fg = attr[i] - 90 + 8;
1769                         } else if(BETWEEN(attr[i], 100, 107)) {
1770                                 term.c.attr.bg = attr[i] - 100 + 8;
1771                         } else {
1772                                 fprintf(stderr,
1773                                         "erresc(default): gfx attr %d unknown\n",
1774                                         attr[i]), csidump();
1775                         }
1776                         break;
1777                 }
1778         }
1779 }
1780
1781 void
1782 tsetscroll(int t, int b) {
1783         int temp;
1784
1785         LIMIT(t, 0, term.row-1);
1786         LIMIT(b, 0, term.row-1);
1787         if(t > b) {
1788                 temp = t;
1789                 t = b;
1790                 b = temp;
1791         }
1792         term.top = t;
1793         term.bot = b;
1794 }
1795
1796 void
1797 tsetmode(bool priv, bool set, int *args, int narg) {
1798         int *lim, mode;
1799         bool alt;
1800
1801         for(lim = args + narg; args < lim; ++args) {
1802                 if(priv) {
1803                         switch(*args) {
1804                         case 1: /* DECCKM -- Cursor key */
1805                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1806                                 break;
1807                         case 5: /* DECSCNM -- Reverse video */
1808                                 mode = term.mode;
1809                                 MODBIT(term.mode, set, MODE_REVERSE);
1810                                 if(mode != term.mode)
1811                                         redraw(REDRAW_TIMEOUT);
1812                                 break;
1813                         case 6: /* DECOM -- Origin */
1814                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1815                                 tmoveato(0, 0);
1816                                 break;
1817                         case 7: /* DECAWM -- Auto wrap */
1818                                 MODBIT(term.mode, set, MODE_WRAP);
1819                                 break;
1820                         case 0:  /* Error (IGNORED) */
1821                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1822                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1823                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1824                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1825                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1826                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1827                         case 42: /* DECNRCM -- National characters (IGNORED) */
1828                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1829                                 break;
1830                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1831                                 MODBIT(term.mode, !set, MODE_HIDE);
1832                                 break;
1833                         case 9:    /* X10 mouse compatibility mode */
1834                                 xsetpointermotion(0);
1835                                 MODBIT(term.mode, 0, MODE_MOUSE);
1836                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1837                                 break;
1838                         case 1000: /* 1000: report button press */
1839                                 xsetpointermotion(0);
1840                                 MODBIT(term.mode, 0, MODE_MOUSE);
1841                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1842                                 break;
1843                         case 1002: /* 1002: report motion on button press */
1844                                 xsetpointermotion(0);
1845                                 MODBIT(term.mode, 0, MODE_MOUSE);
1846                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1847                                 break;
1848                         case 1003: /* 1003: enable all mouse motions */
1849                                 xsetpointermotion(set);
1850                                 MODBIT(term.mode, 0, MODE_MOUSE);
1851                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1852                                 break;
1853                         case 1004: /* 1004: send focus events to tty */
1854                                 MODBIT(term.mode, set, MODE_FOCUS);
1855                                 break;
1856                         case 1006: /* 1006: extended reporting mode */
1857                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1858                                 break;
1859                         case 1034:
1860                                 MODBIT(term.mode, set, MODE_8BIT);
1861                                 break;
1862                         case 1049: /* swap screen & set/restore cursor as xterm */
1863                                 if (!allowaltscreen)
1864                                         break;
1865                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1866                                 /* FALLTHROUGH */
1867                         case 47: /* swap screen */
1868                         case 1047:
1869                                 if (!allowaltscreen)
1870                                         break;
1871                                 alt = IS_SET(MODE_ALTSCREEN);
1872                                 if(alt) {
1873                                         tclearregion(0, 0, term.col-1,
1874                                                         term.row-1);
1875                                 }
1876                                 if(set ^ alt) /* set is always 1 or 0 */
1877                                         tswapscreen();
1878                                 if(*args != 1049)
1879                                         break;
1880                                 /* FALLTHROUGH */
1881                         case 1048:
1882                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1883                                 break;
1884                         case 2004: /* 2004: bracketed paste mode */
1885                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1886                                 break;
1887                         /* Not implemented mouse modes. See comments there. */
1888                         case 1001: /* mouse highlight mode; can hang the
1889                                       terminal by design when implemented. */
1890                         case 1005: /* UTF-8 mouse mode; will confuse
1891                                       applications not supporting UTF-8
1892                                       and luit. */
1893                         case 1015: /* urxvt mangled mouse mode; incompatible
1894                                       and can be mistaken for other control
1895                                       codes. */
1896                         default:
1897                                 fprintf(stderr,
1898                                         "erresc: unknown private set/reset mode %d\n",
1899                                         *args);
1900                                 break;
1901                         }
1902                 } else {
1903                         switch(*args) {
1904                         case 0:  /* Error (IGNORED) */
1905                                 break;
1906                         case 2:  /* KAM -- keyboard action */
1907                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1908                                 break;
1909                         case 4:  /* IRM -- Insertion-replacement */
1910                                 MODBIT(term.mode, set, MODE_INSERT);
1911                                 break;
1912                         case 12: /* SRM -- Send/Receive */
1913                                 MODBIT(term.mode, !set, MODE_ECHO);
1914                                 break;
1915                         case 20: /* LNM -- Linefeed/new line */
1916                                 MODBIT(term.mode, set, MODE_CRLF);
1917                                 break;
1918                         default:
1919                                 fprintf(stderr,
1920                                         "erresc: unknown set/reset mode %d\n",
1921                                         *args);
1922                                 break;
1923                         }
1924                 }
1925         }
1926 }
1927
1928 void
1929 csihandle(void) {
1930         char buf[40];
1931         int len;
1932
1933         switch(csiescseq.mode) {
1934         default:
1935         unknown:
1936                 fprintf(stderr, "erresc: unknown csi ");
1937                 csidump();
1938                 /* die(""); */
1939                 break;
1940         case '@': /* ICH -- Insert <n> blank char */
1941                 DEFAULT(csiescseq.arg[0], 1);
1942                 tinsertblank(csiescseq.arg[0]);
1943                 break;
1944         case 'A': /* CUU -- Cursor <n> Up */
1945                 DEFAULT(csiescseq.arg[0], 1);
1946                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1947                 break;
1948         case 'B': /* CUD -- Cursor <n> Down */
1949         case 'e': /* VPR --Cursor <n> Down */
1950                 DEFAULT(csiescseq.arg[0], 1);
1951                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1952                 break;
1953         case 'i': /* MC -- Media Copy */
1954                 switch(csiescseq.arg[0]) {
1955                 case 0:
1956                         tdump();
1957                         break;
1958                 case 1:
1959                         tdumpline(term.c.y);
1960                         break;
1961                 case 2:
1962                         tdumpsel();
1963                         break;
1964                 case 4:
1965                         term.mode &= ~MODE_PRINT;
1966                         break;
1967                 case 5:
1968                         term.mode |= MODE_PRINT;
1969                         break;
1970                 }
1971                 break;
1972         case 'c': /* DA -- Device Attributes */
1973                 if(csiescseq.arg[0] == 0)
1974                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1975                 break;
1976         case 'C': /* CUF -- Cursor <n> Forward */
1977         case 'a': /* HPR -- Cursor <n> Forward */
1978                 DEFAULT(csiescseq.arg[0], 1);
1979                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1980                 break;
1981         case 'D': /* CUB -- Cursor <n> Backward */
1982                 DEFAULT(csiescseq.arg[0], 1);
1983                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1984                 break;
1985         case 'E': /* CNL -- Cursor <n> Down and first col */
1986                 DEFAULT(csiescseq.arg[0], 1);
1987                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1988                 break;
1989         case 'F': /* CPL -- Cursor <n> Up and first col */
1990                 DEFAULT(csiescseq.arg[0], 1);
1991                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1992                 break;
1993         case 'g': /* TBC -- Tabulation clear */
1994                 switch(csiescseq.arg[0]) {
1995                 case 0: /* clear current tab stop */
1996                         term.tabs[term.c.x] = 0;
1997                         break;
1998                 case 3: /* clear all the tabs */
1999                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2000                         break;
2001                 default:
2002                         goto unknown;
2003                 }
2004                 break;
2005         case 'G': /* CHA -- Move to <col> */
2006         case '`': /* HPA */
2007                 DEFAULT(csiescseq.arg[0], 1);
2008                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2009                 break;
2010         case 'H': /* CUP -- Move to <row> <col> */
2011         case 'f': /* HVP */
2012                 DEFAULT(csiescseq.arg[0], 1);
2013                 DEFAULT(csiescseq.arg[1], 1);
2014                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2015                 break;
2016         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2017                 DEFAULT(csiescseq.arg[0], 1);
2018                 tputtab(csiescseq.arg[0]);
2019                 break;
2020         case 'J': /* ED -- Clear screen */
2021                 selclear(NULL);
2022                 switch(csiescseq.arg[0]) {
2023                 case 0: /* below */
2024                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2025                         if(term.c.y < term.row-1) {
2026                                 tclearregion(0, term.c.y+1, term.col-1,
2027                                                 term.row-1);
2028                         }
2029                         break;
2030                 case 1: /* above */
2031                         if(term.c.y > 1)
2032                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2033                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2034                         break;
2035                 case 2: /* all */
2036                         tclearregion(0, 0, term.col-1, term.row-1);
2037                         break;
2038                 default:
2039                         goto unknown;
2040                 }
2041                 break;
2042         case 'K': /* EL -- Clear line */
2043                 switch(csiescseq.arg[0]) {
2044                 case 0: /* right */
2045                         tclearregion(term.c.x, term.c.y, term.col-1,
2046                                         term.c.y);
2047                         break;
2048                 case 1: /* left */
2049                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2050                         break;
2051                 case 2: /* all */
2052                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2053                         break;
2054                 }
2055                 break;
2056         case 'S': /* SU -- Scroll <n> line up */
2057                 DEFAULT(csiescseq.arg[0], 1);
2058                 tscrollup(term.top, csiescseq.arg[0]);
2059                 break;
2060         case 'T': /* SD -- Scroll <n> line down */
2061                 DEFAULT(csiescseq.arg[0], 1);
2062                 tscrolldown(term.top, csiescseq.arg[0]);
2063                 break;
2064         case 'L': /* IL -- Insert <n> blank lines */
2065                 DEFAULT(csiescseq.arg[0], 1);
2066                 tinsertblankline(csiescseq.arg[0]);
2067                 break;
2068         case 'l': /* RM -- Reset Mode */
2069                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2070                 break;
2071         case 'M': /* DL -- Delete <n> lines */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 tdeleteline(csiescseq.arg[0]);
2074                 break;
2075         case 'X': /* ECH -- Erase <n> char */
2076                 DEFAULT(csiescseq.arg[0], 1);
2077                 tclearregion(term.c.x, term.c.y,
2078                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2079                 break;
2080         case 'P': /* DCH -- Delete <n> char */
2081                 DEFAULT(csiescseq.arg[0], 1);
2082                 tdeletechar(csiescseq.arg[0]);
2083                 break;
2084         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2085                 DEFAULT(csiescseq.arg[0], 1);
2086                 tputtab(-csiescseq.arg[0]);
2087                 break;
2088         case 'd': /* VPA -- Move to <row> */
2089                 DEFAULT(csiescseq.arg[0], 1);
2090                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2091                 break;
2092         case 'h': /* SM -- Set terminal mode */
2093                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2094                 break;
2095         case 'm': /* SGR -- Terminal attribute (color) */
2096                 tsetattr(csiescseq.arg, csiescseq.narg);
2097                 break;
2098         case 'n': /* DSR – Device Status Report (cursor position) */
2099                 if (csiescseq.arg[0] == 6) {
2100                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2101                                         term.c.y+1, term.c.x+1);
2102                         ttywrite(buf, len);
2103                 }
2104                 break;
2105         case 'r': /* DECSTBM -- Set Scrolling Region */
2106                 if(csiescseq.priv) {
2107                         goto unknown;
2108                 } else {
2109                         DEFAULT(csiescseq.arg[0], 1);
2110                         DEFAULT(csiescseq.arg[1], term.row);
2111                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2112                         tmoveato(0, 0);
2113                 }
2114                 break;
2115         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2116                 tcursor(CURSOR_SAVE);
2117                 break;
2118         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2119                 tcursor(CURSOR_LOAD);
2120                 break;
2121         }
2122 }
2123
2124 void
2125 csidump(void) {
2126         int i;
2127         uint c;
2128
2129         printf("ESC[");
2130         for(i = 0; i < csiescseq.len; i++) {
2131                 c = csiescseq.buf[i] & 0xff;
2132                 if(isprint(c)) {
2133                         putchar(c);
2134                 } else if(c == '\n') {
2135                         printf("(\\n)");
2136                 } else if(c == '\r') {
2137                         printf("(\\r)");
2138                 } else if(c == 0x1b) {
2139                         printf("(\\e)");
2140                 } else {
2141                         printf("(%02x)", c);
2142                 }
2143         }
2144         putchar('\n');
2145 }
2146
2147 void
2148 csireset(void) {
2149         memset(&csiescseq, 0, sizeof(csiescseq));
2150 }
2151
2152 void
2153 strhandle(void) {
2154         char *p = NULL;
2155         int j, narg, par;
2156
2157         term.esc &= ~(ESC_STR_END|ESC_STR);
2158         strparse();
2159         narg = strescseq.narg;
2160         par = atoi(strescseq.args[0]);
2161
2162         switch(strescseq.type) {
2163         case ']': /* OSC -- Operating System Command */
2164                 switch(par) {
2165                 case 0:
2166                 case 1:
2167                 case 2:
2168                         if(narg > 1)
2169                                 xsettitle(strescseq.args[1]);
2170                         return;
2171                 case 4: /* color set */
2172                         if(narg < 3)
2173                                 break;
2174                         p = strescseq.args[2];
2175                         /* FALLTHROUGH */
2176                 case 104: /* color reset, here p = NULL */
2177                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2178                         if(xsetcolorname(j, p)) {
2179                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2180                         } else {
2181                                 /*
2182                                  * TODO if defaultbg color is changed, borders
2183                                  * are dirty
2184                                  */
2185                                 redraw(0);
2186                         }
2187                         return;
2188                 }
2189                 break;
2190         case 'k': /* old title set compatibility */
2191                 xsettitle(strescseq.args[0]);
2192                 return;
2193         case 'P': /* DCS -- Device Control String */
2194         case '_': /* APC -- Application Program Command */
2195         case '^': /* PM -- Privacy Message */
2196                 return;
2197         }
2198
2199         fprintf(stderr, "erresc: unknown str ");
2200         strdump();
2201 }
2202
2203 void
2204 strparse(void) {
2205         char *p = strescseq.buf;
2206
2207         strescseq.narg = 0;
2208         strescseq.buf[strescseq.len] = '\0';
2209         while(p && strescseq.narg < STR_ARG_SIZ)
2210                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2211 }
2212
2213 void
2214 strdump(void) {
2215         int i;
2216         uint c;
2217
2218         printf("ESC%c", strescseq.type);
2219         for(i = 0; i < strescseq.len; i++) {
2220                 c = strescseq.buf[i] & 0xff;
2221                 if(c == '\0') {
2222                         return;
2223                 } else if(isprint(c)) {
2224                         putchar(c);
2225                 } else if(c == '\n') {
2226                         printf("(\\n)");
2227                 } else if(c == '\r') {
2228                         printf("(\\r)");
2229                 } else if(c == 0x1b) {
2230                         printf("(\\e)");
2231                 } else {
2232                         printf("(%02x)", c);
2233                 }
2234         }
2235         printf("ESC\\\n");
2236 }
2237
2238 void
2239 strreset(void) {
2240         memset(&strescseq, 0, sizeof(strescseq));
2241 }
2242
2243 void
2244 tprinter(char *s, size_t len) {
2245         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2246                 fprintf(stderr, "Error writing in %s:%s\n",
2247                         opt_io, strerror(errno));
2248                 close(iofd);
2249                 iofd = -1;
2250         }
2251 }
2252
2253 void
2254 toggleprinter(const Arg *arg) {
2255         term.mode ^= MODE_PRINT;
2256 }
2257
2258 void
2259 printscreen(const Arg *arg) {
2260         tdump();
2261 }
2262
2263 void
2264 printsel(const Arg *arg) {
2265         tdumpsel();
2266 }
2267
2268 void
2269 tdumpsel(void) {
2270         char *ptr;
2271
2272         if((ptr = getsel())) {
2273                 tprinter(ptr, strlen(ptr));
2274                 free(ptr);
2275         }
2276 }
2277
2278 void
2279 tdumpline(int n) {
2280         Glyph *bp, *end;
2281
2282         bp = &term.line[n][0];
2283         end = &bp[MIN(tlinelen(n), term.col) - 1];
2284         if(bp != end || bp->c[0] != ' ') {
2285                 for( ;bp <= end; ++bp)
2286                         tprinter(bp->c, utf8len(bp->c));
2287         }
2288         tprinter("\n", 1);
2289 }
2290
2291 void
2292 tdump(void) {
2293         int i;
2294
2295         for(i = 0; i < term.row; ++i)
2296                 tdumpline(i);
2297 }
2298
2299 void
2300 tputtab(int n) {
2301         uint x = term.c.x;
2302
2303         if(n > 0) {
2304                 while(x < term.col && n--)
2305                         for(++x; x < term.col && !term.tabs[x]; ++x)
2306                                 /* nothing */ ;
2307         } else if(n < 0) {
2308                 while(x > 0 && n++)
2309                         for(--x; x > 0 && !term.tabs[x]; --x)
2310                                 /* nothing */ ;
2311         }
2312         tmoveto(x, term.c.y);
2313 }
2314
2315 void
2316 techo(char *buf, int len) {
2317         for(; len > 0; buf++, len--) {
2318                 char c = *buf;
2319
2320                 if(ISCONTROL(c)) { /* control code */
2321                         if(c & 0x80) {
2322                                 c &= 0x7f;
2323                                 tputc("^", 1);
2324                                 tputc("[", 1);
2325                         } else if(c != '\n' && c != '\r' && c != '\t') {
2326                                 c ^= '\x40';
2327                                 tputc("^", 1);
2328                         }
2329                         tputc(&c, 1);
2330                 } else {
2331                         break;
2332                 }
2333         }
2334         if(len)
2335                 tputc(buf, len);
2336 }
2337
2338 void
2339 tdeftran(char ascii) {
2340         static char cs[] = "0B";
2341         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2342         char *p;
2343
2344         if((p = strchr(cs, ascii)) == NULL) {
2345                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2346         } else {
2347                 term.trantbl[term.icharset] = vcs[p - cs];
2348         }
2349 }
2350
2351 void
2352 tstrsequence(uchar c) {
2353         if (c & 0x80) {
2354                 switch (c) {
2355                 case 0x90:   /* DCS -- Device Control String */
2356                         c = 'P';
2357                         break;
2358                 case 0x9f:   /* APC -- Application Program Command */
2359                         c = '_';
2360                         break;
2361                 case 0x9e:   /* PM -- Privacy Message */
2362                         c = '^';
2363                         break;
2364                 case 0x9d:   /* OSC -- Operating System Command */
2365                         c = ']';
2366                         break;
2367                 }
2368         }
2369         strreset();
2370         strescseq.type = c;
2371         term.esc |= ESC_STR;
2372         return;
2373 }
2374
2375 void
2376 tcontrolcode(uchar ascii) {
2377         static char question[UTF_SIZ] = "?";
2378
2379         switch(ascii) {
2380         case '\t':   /* HT */
2381                 tputtab(1);
2382                 return;
2383         case '\b':   /* BS */
2384                 tmoveto(term.c.x-1, term.c.y);
2385                 return;
2386         case '\r':   /* CR */
2387                 tmoveto(0, term.c.y);
2388                 return;
2389         case '\f':   /* LF */
2390         case '\v':   /* VT */
2391         case '\n':   /* LF */
2392                 /* go to first col if the mode is set */
2393                 tnewline(IS_SET(MODE_CRLF));
2394                 return;
2395         case '\a':   /* BEL */
2396                 if(term.esc & ESC_STR_END) {
2397                         /* backwards compatibility to xterm */
2398                         strhandle();
2399                 } else {
2400                         if(!(xw.state & WIN_FOCUSED))
2401                                 xseturgency(1);
2402                         if (bellvolume)
2403                                 XBell(xw.dpy, bellvolume);
2404                 }
2405                 break;
2406         case '\033': /* ESC */
2407                 csireset();
2408                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2409                 term.esc |= ESC_START;
2410                 return;
2411         case '\016': /* SO */
2412                 term.charset = 0;
2413                 return;
2414         case '\017': /* SI */
2415                 term.charset = 1;
2416                 return;
2417         case '\032': /* SUB */
2418                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2419         case '\030': /* CAN */
2420                 csireset();
2421                 break;
2422         case '\005': /* ENQ (IGNORED) */
2423         case '\000': /* NUL (IGNORED) */
2424         case '\021': /* XON (IGNORED) */
2425         case '\023': /* XOFF (IGNORED) */
2426         case 0177:   /* DEL (IGNORED) */
2427                 return;
2428         case 0x84:   /* TODO: IND */
2429                 break;
2430         case 0x85:   /* NEL -- Next line */
2431                 tnewline(1); /* always go to first col */
2432                 break;
2433         case 0x88:   /* HTS -- Horizontal tab stop */
2434                 term.tabs[term.c.x] = 1;
2435                 break;
2436         case 0x8d:   /* TODO: RI */
2437         case 0x8e:   /* TODO: SS2 */
2438         case 0x8f:   /* TODO: SS3 */
2439         case 0x98:   /* TODO: SOS */
2440                 break;
2441         case 0x9a:   /* DECID -- Identify Terminal */
2442                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2443                 break;
2444         case 0x9b:   /* TODO: CSI */
2445         case 0x9c:   /* TODO: ST */
2446                 break;
2447         case 0x90:   /* DCS -- Device Control String */
2448         case 0x9f:   /* APC -- Application Program Command */
2449         case 0x9e:   /* PM -- Privacy Message */
2450         case 0x9d:   /* OSC -- Operating System Command */
2451                 tstrsequence(ascii);
2452                 return;
2453         }
2454         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2455         term.esc &= ~(ESC_STR_END|ESC_STR);
2456         return;
2457 }
2458
2459 void
2460 tdectest(char c) {
2461         static char E[UTF_SIZ] = "E";
2462         int x, y;
2463
2464         if(c == '8') { /* DEC screen alignment test. */
2465                 for(x = 0; x < term.col; ++x) {
2466                         for(y = 0; y < term.row; ++y)
2467                                 tsetchar(E, &term.c.attr, x, y);
2468                 }
2469         }
2470 }
2471
2472 void
2473 tputc(char *c, int len) {
2474         uchar ascii;
2475         bool control;
2476         long unicodep;
2477         int width;
2478         Glyph *gp;
2479
2480         if(len == 1) {
2481                 width = 1;
2482                 unicodep = ascii = *c;
2483         } else {
2484                 utf8decode(c, &unicodep, UTF_SIZ);
2485                 width = wcwidth(unicodep);
2486                 control = ISCONTROLC1(unicodep);
2487                 ascii = unicodep;
2488         }
2489
2490         if(IS_SET(MODE_PRINT))
2491                 tprinter(c, len);
2492         control = ISCONTROL(unicodep);
2493
2494         /*
2495          * STR sequence must be checked before anything else
2496          * because it uses all following characters until it
2497          * receives a ESC, a SUB, a ST or any other C1 control
2498          * character.
2499          */
2500         if(term.esc & ESC_STR) {
2501                 if(width == 1 &&
2502                    (ascii == '\a' || ascii == 030 ||
2503                     ascii == 032  || ascii == 033 ||
2504                     ISCONTROLC1(unicodep))) {
2505                         term.esc &= ~(ESC_START|ESC_STR);
2506                         term.esc |= ESC_STR_END;
2507                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2508                         memmove(&strescseq.buf[strescseq.len], c, len);
2509                         strescseq.len += len;
2510                         return;
2511                 } else {
2512                 /*
2513                  * Here is a bug in terminals. If the user never sends
2514                  * some code to stop the str or esc command, then st
2515                  * will stop responding. But this is better than
2516                  * silently failing with unknown characters. At least
2517                  * then users will report back.
2518                  *
2519                  * In the case users ever get fixed, here is the code:
2520                  */
2521                 /*
2522                  * term.esc = 0;
2523                  * strhandle();
2524                  */
2525                         return;
2526                 }
2527         }
2528
2529         /*
2530          * Actions of control codes must be performed as soon they arrive
2531          * because they can be embedded inside a control sequence, and
2532          * they must not cause conflicts with sequences.
2533          */
2534         if(control) {
2535                 tcontrolcode(ascii);
2536                 /*
2537                  * control codes are not shown ever
2538                  */
2539                 return;
2540         } else if(term.esc & ESC_START) {
2541                 if(term.esc & ESC_CSI) {
2542                         csiescseq.buf[csiescseq.len++] = ascii;
2543                         if(BETWEEN(ascii, 0x40, 0x7E)
2544                                         || csiescseq.len >= \
2545                                         sizeof(csiescseq.buf)-1) {
2546                                 term.esc = 0;
2547                                 csiparse();
2548                                 csihandle();
2549                         }
2550                         return;
2551                 } else if(term.esc & ESC_ALTCHARSET) {
2552                         tdeftran(ascii);
2553                 } else if(term.esc & ESC_TEST) {
2554                         tdectest(ascii);
2555                 } else {
2556                         switch(ascii) {
2557                         case '[':
2558                                 term.esc |= ESC_CSI;
2559                                 return;
2560                         case '#':
2561                                 term.esc |= ESC_TEST;
2562                                 return;
2563                         case 'P': /* DCS -- Device Control String */
2564                         case '_': /* APC -- Application Program Command */
2565                         case '^': /* PM -- Privacy Message */
2566                         case ']': /* OSC -- Operating System Command */
2567                         case 'k': /* old title set compatibility */
2568                                 tstrsequence(ascii);
2569                                 return;
2570                         case '(': /* set primary charset G0 */
2571                         case ')': /* set secondary charset G1 */
2572                         case '*': /* set tertiary charset G2 */
2573                         case '+': /* set quaternary charset G3 */
2574                                 term.icharset = ascii - '(';
2575                                 term.esc |= ESC_ALTCHARSET;
2576                                 return;
2577                         case 'D': /* IND -- Linefeed */
2578                                 if(term.c.y == term.bot) {
2579                                         tscrollup(term.top, 1);
2580                                 } else {
2581                                         tmoveto(term.c.x, term.c.y+1);
2582                                 }
2583                                 break;
2584                         case 'E': /* NEL -- Next line */
2585                                 tnewline(1); /* always go to first col */
2586                                 break;
2587                         case 'H': /* HTS -- Horizontal tab stop */
2588                                 term.tabs[term.c.x] = 1;
2589                                 break;
2590                         case 'M': /* RI -- Reverse index */
2591                                 if(term.c.y == term.top) {
2592                                         tscrolldown(term.top, 1);
2593                                 } else {
2594                                         tmoveto(term.c.x, term.c.y-1);
2595                                 }
2596                                 break;
2597                         case 'Z': /* DECID -- Identify Terminal */
2598                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2599                                 break;
2600                         case 'c': /* RIS -- Reset to inital state */
2601                                 treset();
2602                                 xresettitle();
2603                                 xloadcols();
2604                                 break;
2605                         case '=': /* DECPAM -- Application keypad */
2606                                 term.mode |= MODE_APPKEYPAD;
2607                                 break;
2608                         case '>': /* DECPNM -- Normal keypad */
2609                                 term.mode &= ~MODE_APPKEYPAD;
2610                                 break;
2611                         case '7': /* DECSC -- Save Cursor */
2612                                 tcursor(CURSOR_SAVE);
2613                                 break;
2614                         case '8': /* DECRC -- Restore Cursor */
2615                                 tcursor(CURSOR_LOAD);
2616                                 break;
2617                         case '\\': /* ST -- String Terminator */
2618                                 if(term.esc & ESC_STR_END)
2619                                         strhandle();
2620                                 break;
2621                         default:
2622                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2623                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2624                                 break;
2625                         }
2626                 }
2627                 term.esc = 0;
2628                 /*
2629                  * All characters which form part of a sequence are not
2630                  * printed
2631                  */
2632                 return;
2633         }
2634         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2635                 selclear(NULL);
2636
2637         gp = &term.line[term.c.y][term.c.x];
2638         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2639                 gp->mode |= ATTR_WRAP;
2640                 tnewline(1);
2641         }
2642
2643         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2644                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2645
2646         if(term.c.x+width > term.col)
2647                 tnewline(1);
2648
2649         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2650
2651         if(width == 2) {
2652                 gp->mode |= ATTR_WIDE;
2653                 if(term.c.x+1 < term.col) {
2654                         gp[1].c[0] = '\0';
2655                         gp[1].mode = ATTR_WDUMMY;
2656                 }
2657         }
2658         if(term.c.x+width < term.col) {
2659                 tmoveto(term.c.x+width, term.c.y);
2660         } else {
2661                 term.c.state |= CURSOR_WRAPNEXT;
2662         }
2663 }
2664
2665 int
2666 tresize(int col, int row) {
2667         int i;
2668         int minrow = MIN(row, term.row);
2669         int mincol = MIN(col, term.col);
2670         int slide = term.c.y - row + 1;
2671         bool *bp;
2672         Line *orig;
2673         TCursor c;
2674
2675         if(col < 1 || row < 1)
2676                 return 0;
2677
2678         /* free unneeded rows */
2679         i = 0;
2680         if(slide > 0) {
2681                 /*
2682                  * slide screen to keep cursor where we expect it -
2683                  * tscrollup would work here, but we can optimize to
2684                  * memmove because we're freeing the earlier lines
2685                  */
2686                 for(/* i = 0 */; i < slide; i++) {
2687                         free(term.line[i]);
2688                         free(term.alt[i]);
2689                 }
2690                 memmove(term.line, term.line + slide, row * sizeof(Line));
2691                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2692         }
2693         for(i += row; i < term.row; i++) {
2694                 free(term.line[i]);
2695                 free(term.alt[i]);
2696         }
2697
2698         /* resize to new height */
2699         term.line = xrealloc(term.line, row * sizeof(Line));
2700         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2701         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2702         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2703
2704         /* resize each row to new width, zero-pad if needed */
2705         for(i = 0; i < minrow; i++) {
2706                 term.dirty[i] = 1;
2707                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2708                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2709         }
2710
2711         /* allocate any new rows */
2712         for(/* i == minrow */; i < row; i++) {
2713                 term.dirty[i] = 1;
2714                 term.line[i] = xmalloc(col * sizeof(Glyph));
2715                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2716         }
2717         if(col > term.col) {
2718                 bp = term.tabs + term.col;
2719
2720                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2721                 while(--bp > term.tabs && !*bp)
2722                         /* nothing */ ;
2723                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2724                         *bp = 1;
2725         }
2726         /* update terminal size */
2727         term.col = col;
2728         term.row = row;
2729         /* reset scrolling region */
2730         tsetscroll(0, row-1);
2731         /* make use of the LIMIT in tmoveto */
2732         tmoveto(term.c.x, term.c.y);
2733         /* Clearing both screens */
2734         orig = term.line;
2735         c = term.c;
2736         do {
2737                 if(mincol < col && 0 < minrow) {
2738                         tclearregion(mincol, 0, col - 1, minrow - 1);
2739                 }
2740                 if(0 < col && minrow < row) {
2741                         tclearregion(0, minrow, col - 1, row - 1);
2742                 }
2743                 tswapscreen();
2744                 tcursor(CURSOR_LOAD);
2745         } while(orig != term.line);
2746         term.c = c;
2747
2748         return (slide > 0);
2749 }
2750
2751 void
2752 xresize(int col, int row) {
2753         xw.tw = MAX(1, col * xw.cw);
2754         xw.th = MAX(1, row * xw.ch);
2755
2756         XFreePixmap(xw.dpy, xw.buf);
2757         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2758                         DefaultDepth(xw.dpy, xw.scr));
2759         XftDrawChange(xw.draw, xw.buf);
2760         xclear(0, 0, xw.w, xw.h);
2761 }
2762
2763 static inline ushort
2764 sixd_to_16bit(int x) {
2765         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2766 }
2767
2768 void
2769 xloadcols(void) {
2770         int i;
2771         XRenderColor color = { .alpha = 0xffff };
2772         static bool loaded;
2773         Color *cp;
2774
2775         if(loaded) {
2776                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2777                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2778         }
2779
2780         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2781         for(i = 0; i < LEN(colorname); i++) {
2782                 if(!colorname[i])
2783                         continue;
2784                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2785                         die("Could not allocate color '%s'\n", colorname[i]);
2786                 }
2787         }
2788
2789         /* load colors [16-231] ; same colors as xterm */
2790         for(i = 16; i < 6*6*6+16; i++) {
2791                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2792                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2793                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2794                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2795                         die("Could not allocate color %d\n", i);
2796         }
2797
2798         /* load colors [232-255] ; grayscale */
2799         for(; i < 256; i++) {
2800                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2801                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2802                         die("Could not allocate color %d\n", i);
2803         }
2804         loaded = true;
2805 }
2806
2807 int
2808 xsetcolorname(int x, const char *name) {
2809         XRenderColor color = { .alpha = 0xffff };
2810         Color ncolor;
2811
2812         if(!BETWEEN(x, 0, LEN(colorname)))
2813                 return 1;
2814
2815         if(!name) {
2816                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2817                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2818                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2819                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2820                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2821                                                 xw.cmap, &color, &ncolor)) {
2822                                 return 1;
2823                         }
2824
2825                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2826                         dc.col[x] = ncolor;
2827                         return 0;
2828                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2829                         color.red = color.green = color.blue = \
2830                                     0x0808 + 0x0a0a * (x - (16 + 216));
2831                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2832                                                 xw.cmap, &color, &ncolor)) {
2833                                 return 1;
2834                         }
2835
2836                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2837                         dc.col[x] = ncolor;
2838                         return 0;
2839                 } else { /* system colors */
2840                         name = colorname[x];
2841                 }
2842         }
2843         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2844                 return 1;
2845
2846         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2847         dc.col[x] = ncolor;
2848         return 0;
2849 }
2850
2851 void
2852 xtermclear(int col1, int row1, int col2, int row2) {
2853         XftDrawRect(xw.draw,
2854                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2855                         borderpx + col1 * xw.cw,
2856                         borderpx + row1 * xw.ch,
2857                         (col2-col1+1) * xw.cw,
2858                         (row2-row1+1) * xw.ch);
2859 }
2860
2861 /*
2862  * Absolute coordinates.
2863  */
2864 void
2865 xclear(int x1, int y1, int x2, int y2) {
2866         XftDrawRect(xw.draw,
2867                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2868                         x1, y1, x2-x1, y2-y1);
2869 }
2870
2871 void
2872 xhints(void) {
2873         XClassHint class = {opt_class ? opt_class : termname, termname};
2874         XWMHints wm = {.flags = InputHint, .input = 1};
2875         XSizeHints *sizeh = NULL;
2876
2877         sizeh = XAllocSizeHints();
2878
2879         sizeh->flags = PSize | PResizeInc | PBaseSize;
2880         sizeh->height = xw.h;
2881         sizeh->width = xw.w;
2882         sizeh->height_inc = xw.ch;
2883         sizeh->width_inc = xw.cw;
2884         sizeh->base_height = 2 * borderpx;
2885         sizeh->base_width = 2 * borderpx;
2886         if(xw.isfixed == True) {
2887                 sizeh->flags |= PMaxSize | PMinSize;
2888                 sizeh->min_width = sizeh->max_width = xw.w;
2889                 sizeh->min_height = sizeh->max_height = xw.h;
2890         }
2891         if(xw.gm & (XValue|YValue)) {
2892                 sizeh->flags |= USPosition | PWinGravity;
2893                 sizeh->x = xw.l;
2894                 sizeh->y = xw.t;
2895                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2896         }
2897
2898         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2899                         &class);
2900         XFree(sizeh);
2901 }
2902
2903 int
2904 xgeommasktogravity(int mask) {
2905         switch(mask & (XNegative|YNegative)) {
2906         case 0:
2907                 return NorthWestGravity;
2908         case XNegative:
2909                 return NorthEastGravity;
2910         case YNegative:
2911                 return SouthWestGravity;
2912         }
2913         return SouthEastGravity;
2914 }
2915
2916 int
2917 xloadfont(Font *f, FcPattern *pattern) {
2918         FcPattern *match;
2919         FcResult result;
2920
2921         match = FcFontMatch(NULL, pattern, &result);
2922         if(!match)
2923                 return 1;
2924
2925         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2926                 FcPatternDestroy(match);
2927                 return 1;
2928         }
2929
2930         f->set = NULL;
2931         f->pattern = FcPatternDuplicate(pattern);
2932
2933         f->ascent = f->match->ascent;
2934         f->descent = f->match->descent;
2935         f->lbearing = 0;
2936         f->rbearing = f->match->max_advance_width;
2937
2938         f->height = f->ascent + f->descent;
2939         f->width = f->lbearing + f->rbearing;
2940
2941         return 0;
2942 }
2943
2944 void
2945 xloadfonts(char *fontstr, double fontsize) {
2946         FcPattern *pattern;
2947         FcResult r_sz, r_psz;
2948         double fontval;
2949         float ceilf(float);
2950
2951         if(fontstr[0] == '-') {
2952                 pattern = XftXlfdParse(fontstr, False, False);
2953         } else {
2954                 pattern = FcNameParse((FcChar8 *)fontstr);
2955         }
2956
2957         if(!pattern)
2958                 die("st: can't open font %s\n", fontstr);
2959
2960         if(fontsize > 0) {
2961                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2962                 FcPatternDel(pattern, FC_SIZE);
2963                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2964                 usedfontsize = fontsize;
2965         } else {
2966                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2967                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2968                 if(r_psz == FcResultMatch) {
2969                         usedfontsize = fontval;
2970                 } else if(r_sz == FcResultMatch) {
2971                         usedfontsize = -1;
2972                 } else {
2973                         /*
2974                          * Default font size is 12, if none given. This is to
2975                          * have a known usedfontsize value.
2976                          */
2977                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2978                         usedfontsize = 12;
2979                 }
2980         }
2981
2982         FcConfigSubstitute(0, pattern, FcMatchPattern);
2983         FcDefaultSubstitute(pattern);
2984
2985         if(xloadfont(&dc.font, pattern))
2986                 die("st: can't open font %s\n", fontstr);
2987
2988         if(usedfontsize < 0) {
2989                 FcPatternGetDouble(dc.font.match->pattern,
2990                                    FC_PIXEL_SIZE, 0, &fontval);
2991                 usedfontsize = fontval;
2992         }
2993
2994         /* Setting character width and height. */
2995         xw.cw = ceilf(dc.font.width * cwscale);
2996         xw.ch = ceilf(dc.font.height * chscale);
2997
2998         FcPatternDel(pattern, FC_SLANT);
2999         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3000         if(xloadfont(&dc.ifont, pattern))
3001                 die("st: can't open font %s\n", fontstr);
3002
3003         FcPatternDel(pattern, FC_WEIGHT);
3004         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3005         if(xloadfont(&dc.ibfont, pattern))
3006                 die("st: can't open font %s\n", fontstr);
3007
3008         FcPatternDel(pattern, FC_SLANT);
3009         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3010         if(xloadfont(&dc.bfont, pattern))
3011                 die("st: can't open font %s\n", fontstr);
3012
3013         FcPatternDestroy(pattern);
3014 }
3015
3016 int
3017 xloadfontset(Font *f) {
3018         FcResult result;
3019
3020         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3021                 return 1;
3022         return 0;
3023 }
3024
3025 void
3026 xunloadfont(Font *f) {
3027         XftFontClose(xw.dpy, f->match);
3028         FcPatternDestroy(f->pattern);
3029         if(f->set)
3030                 FcFontSetDestroy(f->set);
3031 }
3032
3033 void
3034 xunloadfonts(void) {
3035         /* Free the loaded fonts in the font cache.  */
3036         while(frclen > 0)
3037                 XftFontClose(xw.dpy, frc[--frclen].font);
3038
3039         xunloadfont(&dc.font);
3040         xunloadfont(&dc.bfont);
3041         xunloadfont(&dc.ifont);
3042         xunloadfont(&dc.ibfont);
3043 }
3044
3045 void
3046 xzoom(const Arg *arg) {
3047         xunloadfonts();
3048         xloadfonts(usedfont, usedfontsize + arg->i);
3049         cresize(0, 0);
3050         redraw(0);
3051         xhints();
3052 }
3053
3054 void
3055 xinit(void) {
3056         XGCValues gcvalues;
3057         Cursor cursor;
3058         Window parent;
3059         pid_t thispid = getpid();
3060
3061         if(!(xw.dpy = XOpenDisplay(NULL)))
3062                 die("Can't open display\n");
3063         xw.scr = XDefaultScreen(xw.dpy);
3064         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3065
3066         /* font */
3067         if(!FcInit())
3068                 die("Could not init fontconfig.\n");
3069
3070         usedfont = (opt_font == NULL)? font : opt_font;
3071         xloadfonts(usedfont, 0);
3072
3073         /* colors */
3074         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3075         xloadcols();
3076
3077         /* adjust fixed window geometry */
3078         xw.w = 2 * borderpx + term.col * xw.cw;
3079         xw.h = 2 * borderpx + term.row * xw.ch;
3080         if(xw.gm & XNegative)
3081                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3082         if(xw.gm & YNegative)
3083                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3084
3085         /* Events */
3086         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3087         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3088         xw.attrs.bit_gravity = NorthWestGravity;
3089         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3090                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3091                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3092         xw.attrs.colormap = xw.cmap;
3093
3094         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3095                         XRootWindow(xw.dpy, xw.scr);
3096         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3097                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3098                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3099                         | CWEventMask | CWColormap, &xw.attrs);
3100
3101         memset(&gcvalues, 0, sizeof(gcvalues));
3102         gcvalues.graphics_exposures = False;
3103         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3104                         &gcvalues);
3105         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3106                         DefaultDepth(xw.dpy, xw.scr));
3107         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3108         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3109
3110         /* Xft rendering context */
3111         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3112
3113         /* input methods */
3114         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3115                 XSetLocaleModifiers("@im=local");
3116                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3117                         XSetLocaleModifiers("@im=");
3118                         if((xw.xim = XOpenIM(xw.dpy,
3119                                         NULL, NULL, NULL)) == NULL) {
3120                                 die("XOpenIM failed. Could not open input"
3121                                         " device.\n");
3122                         }
3123                 }
3124         }
3125         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3126                                            | XIMStatusNothing, XNClientWindow, xw.win,
3127                                            XNFocusWindow, xw.win, NULL);
3128         if(xw.xic == NULL)
3129                 die("XCreateIC failed. Could not obtain input method.\n");
3130
3131         /* white cursor, black outline */
3132         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3133         XDefineCursor(xw.dpy, xw.win, cursor);
3134         XRecolorCursor(xw.dpy, cursor,
3135                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3136                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3137
3138         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3139         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3140         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3141         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3142
3143         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3144         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3145                         PropModeReplace, (uchar *)&thispid, 1);
3146
3147         xresettitle();
3148         XMapWindow(xw.dpy, xw.win);
3149         xhints();
3150         XSync(xw.dpy, False);
3151 }
3152
3153 void
3154 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3155         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3156             width = charlen * xw.cw, xp, i;
3157         int frcflags;
3158         int u8fl, u8fblen, u8cblen, doesexist;
3159         char *u8c, *u8fs;
3160         long unicodep;
3161         Font *font = &dc.font;
3162         FcResult fcres;
3163         FcPattern *fcpattern, *fontpattern;
3164         FcFontSet *fcsets[] = { NULL };
3165         FcCharSet *fccharset;
3166         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3167         XRenderColor colfg, colbg;
3168         XRectangle r;
3169         int oneatatime;
3170
3171         frcflags = FRC_NORMAL;
3172
3173         if(base.mode & ATTR_ITALIC) {
3174                 if(base.fg == defaultfg)
3175                         base.fg = defaultitalic;
3176                 font = &dc.ifont;
3177                 frcflags = FRC_ITALIC;
3178         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3179                 if(base.fg == defaultfg)
3180                         base.fg = defaultitalic;
3181                 font = &dc.ibfont;
3182                 frcflags = FRC_ITALICBOLD;
3183         } else if(base.mode & ATTR_UNDERLINE) {
3184                 if(base.fg == defaultfg)
3185                         base.fg = defaultunderline;
3186         }
3187
3188         if(IS_TRUECOL(base.fg)) {
3189                 colfg.alpha = 0xffff;
3190                 colfg.red = TRUERED(base.fg);
3191                 colfg.green = TRUEGREEN(base.fg);
3192                 colfg.blue = TRUEBLUE(base.fg);
3193                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3194                 fg = &truefg;
3195         } else {
3196                 fg = &dc.col[base.fg];
3197         }
3198
3199         if(IS_TRUECOL(base.bg)) {
3200                 colbg.alpha = 0xffff;
3201                 colbg.green = TRUEGREEN(base.bg);
3202                 colbg.red = TRUERED(base.bg);
3203                 colbg.blue = TRUEBLUE(base.bg);
3204                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3205                 bg = &truebg;
3206         } else {
3207                 bg = &dc.col[base.bg];
3208         }
3209
3210         if(base.mode & ATTR_BOLD) {
3211                 /*
3212                  * change basic system colors [0-7]
3213                  * to bright system colors [8-15]
3214                  */
3215                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3216                         fg = &dc.col[base.fg + 8];
3217
3218                 if(base.mode & ATTR_ITALIC) {
3219                         font = &dc.ibfont;
3220                         frcflags = FRC_ITALICBOLD;
3221                 } else {
3222                         font = &dc.bfont;
3223                         frcflags = FRC_BOLD;
3224                 }
3225         }
3226
3227         if(IS_SET(MODE_REVERSE)) {
3228                 if(fg == &dc.col[defaultfg]) {
3229                         fg = &dc.col[defaultbg];
3230                 } else {
3231                         colfg.red = ~fg->color.red;
3232                         colfg.green = ~fg->color.green;
3233                         colfg.blue = ~fg->color.blue;
3234                         colfg.alpha = fg->color.alpha;
3235                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3236                                         &revfg);
3237                         fg = &revfg;
3238                 }
3239
3240                 if(bg == &dc.col[defaultbg]) {
3241                         bg = &dc.col[defaultfg];
3242                 } else {
3243                         colbg.red = ~bg->color.red;
3244                         colbg.green = ~bg->color.green;
3245                         colbg.blue = ~bg->color.blue;
3246                         colbg.alpha = bg->color.alpha;
3247                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3248                                         &revbg);
3249                         bg = &revbg;
3250                 }
3251         }
3252
3253         if(base.mode & ATTR_REVERSE) {
3254                 temp = fg;
3255                 fg = bg;
3256                 bg = temp;
3257         }
3258
3259         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3260                 colfg.red = fg->color.red / 2;
3261                 colfg.green = fg->color.green / 2;
3262                 colfg.blue = fg->color.blue / 2;
3263                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3264                 fg = &revfg;
3265         }
3266
3267         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3268                 fg = bg;
3269
3270         if(base.mode & ATTR_INVISIBLE)
3271                 fg = bg;
3272
3273         /* Intelligent cleaning up of the borders. */
3274         if(x == 0) {
3275                 xclear(0, (y == 0)? 0 : winy, borderpx,
3276                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3277         }
3278         if(x + charlen >= term.col) {
3279                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3280                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3281         }
3282         if(y == 0)
3283                 xclear(winx, 0, winx + width, borderpx);
3284         if(y == term.row-1)
3285                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3286
3287         /* Clean up the region we want to draw to. */
3288         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3289
3290         /* Set the clip region because Xft is sometimes dirty. */
3291         r.x = 0;
3292         r.y = 0;
3293         r.height = xw.ch;
3294         r.width = width;
3295         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3296
3297         for(xp = winx; bytelen > 0;) {
3298                 /*
3299                  * Search for the range in the to be printed string of glyphs
3300                  * that are in the main font. Then print that range. If
3301                  * some glyph is found that is not in the font, do the
3302                  * fallback dance.
3303                  */
3304                 u8fs = s;
3305                 u8fblen = 0;
3306                 u8fl = 0;
3307                 oneatatime = font->width != xw.cw;
3308                 for(;;) {
3309                         u8c = s;
3310                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3311                         s += u8cblen;
3312                         bytelen -= u8cblen;
3313
3314                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3315                         if(doesexist) {
3316                                         u8fl++;
3317                                         u8fblen += u8cblen;
3318                                         if(!oneatatime && bytelen > 0)
3319                                                         continue;
3320                         }
3321
3322                         if(u8fl > 0) {
3323                                 XftDrawStringUtf8(xw.draw, fg,
3324                                                 font->match, xp,
3325                                                 winy + font->ascent,
3326                                                 (FcChar8 *)u8fs,
3327                                                 u8fblen);
3328                                 xp += xw.cw * u8fl;
3329                         }
3330                         break;
3331                 }
3332                 if(doesexist) {
3333                         if(oneatatime)
3334                                 continue;
3335                         break;
3336                 }
3337
3338                 /* Search the font cache. */
3339                 for(i = 0; i < frclen; i++) {
3340                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3341                                         && frc[i].flags == frcflags) {
3342                                 break;
3343                         }
3344                 }
3345
3346                 /* Nothing was found. */
3347                 if(i >= frclen) {
3348                         if(!font->set)
3349                                 xloadfontset(font);
3350                         fcsets[0] = font->set;
3351
3352                         /*
3353                          * Nothing was found in the cache. Now use
3354                          * some dozen of Fontconfig calls to get the
3355                          * font for one single character.
3356                          *
3357                          * Xft and fontconfig are design failures.
3358                          */
3359                         fcpattern = FcPatternDuplicate(font->pattern);
3360                         fccharset = FcCharSetCreate();
3361
3362                         FcCharSetAddChar(fccharset, unicodep);
3363                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3364                                         fccharset);
3365                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3366                                         FcTrue);
3367
3368                         FcConfigSubstitute(0, fcpattern,
3369                                         FcMatchPattern);
3370                         FcDefaultSubstitute(fcpattern);
3371
3372                         fontpattern = FcFontSetMatch(0, fcsets,
3373                                         FcTrue, fcpattern, &fcres);
3374
3375                         /*
3376                          * Overwrite or create the new cache entry.
3377                          */
3378                         if(frclen >= LEN(frc)) {
3379                                 frclen = LEN(frc) - 1;
3380                                 XftFontClose(xw.dpy, frc[frclen].font);
3381                         }
3382
3383                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3384                                         fontpattern);
3385                         frc[frclen].flags = frcflags;
3386
3387                         i = frclen;
3388                         frclen++;
3389
3390                         FcPatternDestroy(fcpattern);
3391                         FcCharSetDestroy(fccharset);
3392                 }
3393
3394                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3395                                 xp, winy + frc[i].font->ascent,
3396                                 (FcChar8 *)u8c, u8cblen);
3397
3398                 xp += xw.cw * wcwidth(unicodep);
3399         }
3400
3401         /*
3402          * This is how the loop above actually should be. Why does the
3403          * application have to care about font details?
3404          *
3405          * I have to repeat: Xft and Fontconfig are design failures.
3406          */
3407         /*
3408         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3409                         winy + font->ascent, (FcChar8 *)s, bytelen);
3410         */
3411
3412         if(base.mode & ATTR_UNDERLINE) {
3413                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3414                                 width, 1);
3415         }
3416
3417         if(base.mode & ATTR_STRUCK) {
3418                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3419                                 width, 1);
3420         }
3421
3422         /* Reset clip to none. */
3423         XftDrawSetClip(xw.draw, 0);
3424 }
3425
3426 void
3427 xdrawcursor(void) {
3428         static int oldx = 0, oldy = 0;
3429         int sl, width, curx;
3430         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3431
3432         LIMIT(oldx, 0, term.col-1);
3433         LIMIT(oldy, 0, term.row-1);
3434
3435         curx = term.c.x;
3436
3437         /* adjust position if in dummy */
3438         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3439                 oldx--;
3440         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3441                 curx--;
3442
3443         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3444
3445         /* remove the old cursor */
3446         sl = utf8len(term.line[oldy][oldx].c);
3447         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3448         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3449                         oldy, width, sl);
3450
3451         /* draw the new one */
3452         if(!(IS_SET(MODE_HIDE))) {
3453                 if(xw.state & WIN_FOCUSED) {
3454                         if(IS_SET(MODE_REVERSE)) {
3455                                 g.mode |= ATTR_REVERSE;
3456                                 g.fg = defaultcs;
3457                                 g.bg = defaultfg;
3458                         }
3459
3460                         sl = utf8len(g.c);
3461                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3462                                 ? 2 : 1;
3463                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3464                 } else {
3465                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3466                                         borderpx + curx * xw.cw,
3467                                         borderpx + term.c.y * xw.ch,
3468                                         xw.cw - 1, 1);
3469                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3470                                         borderpx + curx * xw.cw,
3471                                         borderpx + term.c.y * xw.ch,
3472                                         1, xw.ch - 1);
3473                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3474                                         borderpx + (curx + 1) * xw.cw - 1,
3475                                         borderpx + term.c.y * xw.ch,
3476                                         1, xw.ch - 1);
3477                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3478                                         borderpx + curx * xw.cw,
3479                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3480                                         xw.cw, 1);
3481                 }
3482                 oldx = curx, oldy = term.c.y;
3483         }
3484 }
3485
3486
3487 void
3488 xsettitle(char *p) {
3489         XTextProperty prop;
3490
3491         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3492                         &prop);
3493         XSetWMName(xw.dpy, xw.win, &prop);
3494         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3495         XFree(prop.value);
3496 }
3497
3498 void
3499 xresettitle(void) {
3500         xsettitle(opt_title ? opt_title : "st");
3501 }
3502
3503 void
3504 redraw(int timeout) {
3505         struct timespec tv = {0, timeout * 1000};
3506
3507         tfulldirt();
3508         draw();
3509
3510         if(timeout > 0) {
3511                 nanosleep(&tv, NULL);
3512                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3513         }
3514 }
3515
3516 void
3517 draw(void) {
3518         drawregion(0, 0, term.col, term.row);
3519         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3520                         xw.h, 0, 0);
3521         XSetForeground(xw.dpy, dc.gc,
3522                         dc.col[IS_SET(MODE_REVERSE)?
3523                                 defaultfg : defaultbg].pixel);
3524 }
3525
3526 void
3527 drawregion(int x1, int y1, int x2, int y2) {
3528         int ic, ib, x, y, ox, sl;
3529         Glyph base, new;
3530         char buf[DRAW_BUF_SIZ];
3531         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3532         long unicodep;
3533
3534         if(!(xw.state & WIN_VISIBLE))
3535                 return;
3536
3537         for(y = y1; y < y2; y++) {
3538                 if(!term.dirty[y])
3539                         continue;
3540
3541                 xtermclear(0, y, term.col, y);
3542                 term.dirty[y] = 0;
3543                 base = term.line[y][0];
3544                 ic = ib = ox = 0;
3545                 for(x = x1; x < x2; x++) {
3546                         new = term.line[y][x];
3547                         if(new.mode == ATTR_WDUMMY)
3548                                 continue;
3549                         if(ena_sel && selected(x, y))
3550                                 new.mode ^= ATTR_REVERSE;
3551                         if(ib > 0 && (ATTRCMP(base, new)
3552                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3553                                 xdraws(buf, base, ox, y, ic, ib);
3554                                 ic = ib = 0;
3555                         }
3556                         if(ib == 0) {
3557                                 ox = x;
3558                                 base = new;
3559                         }
3560
3561                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3562                         memcpy(buf+ib, new.c, sl);
3563                         ib += sl;
3564                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3565                 }
3566                 if(ib > 0)
3567                         xdraws(buf, base, ox, y, ic, ib);
3568         }
3569         xdrawcursor();
3570 }
3571
3572 void
3573 expose(XEvent *ev) {
3574         XExposeEvent *e = &ev->xexpose;
3575
3576         if(xw.state & WIN_REDRAW) {
3577                 if(!e->count)
3578                         xw.state &= ~WIN_REDRAW;
3579         }
3580         redraw(0);
3581 }
3582
3583 void
3584 visibility(XEvent *ev) {
3585         XVisibilityEvent *e = &ev->xvisibility;
3586
3587         if(e->state == VisibilityFullyObscured) {
3588                 xw.state &= ~WIN_VISIBLE;
3589         } else if(!(xw.state & WIN_VISIBLE)) {
3590                 /* need a full redraw for next Expose, not just a buf copy */
3591                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3592         }
3593 }
3594
3595 void
3596 unmap(XEvent *ev) {
3597         xw.state &= ~WIN_VISIBLE;
3598 }
3599
3600 void
3601 xsetpointermotion(int set) {
3602         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3603         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3604 }
3605
3606 void
3607 xseturgency(int add) {
3608         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3609
3610         MODBIT(h->flags, add, XUrgencyHint);
3611         XSetWMHints(xw.dpy, xw.win, h);
3612         XFree(h);
3613 }
3614
3615 void
3616 focus(XEvent *ev) {
3617         XFocusChangeEvent *e = &ev->xfocus;
3618
3619         if(e->mode == NotifyGrab)
3620                 return;
3621
3622         if(ev->type == FocusIn) {
3623                 XSetICFocus(xw.xic);
3624                 xw.state |= WIN_FOCUSED;
3625                 xseturgency(0);
3626                 if(IS_SET(MODE_FOCUS))
3627                         ttywrite("\033[I", 3);
3628         } else {
3629                 XUnsetICFocus(xw.xic);
3630                 xw.state &= ~WIN_FOCUSED;
3631                 if(IS_SET(MODE_FOCUS))
3632                         ttywrite("\033[O", 3);
3633         }
3634 }
3635
3636 static inline bool
3637 match(uint mask, uint state) {
3638         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3639 }
3640
3641 void
3642 numlock(const Arg *dummy) {
3643         term.numlock ^= 1;
3644 }
3645
3646 char*
3647 kmap(KeySym k, uint state) {
3648         Key *kp;
3649         int i;
3650
3651         /* Check for mapped keys out of X11 function keys. */
3652         for(i = 0; i < LEN(mappedkeys); i++) {
3653                 if(mappedkeys[i] == k)
3654                         break;
3655         }
3656         if(i == LEN(mappedkeys)) {
3657                 if((k & 0xFFFF) < 0xFD00)
3658                         return NULL;
3659         }
3660
3661         for(kp = key; kp < key + LEN(key); kp++) {
3662                 if(kp->k != k)
3663                         continue;
3664
3665                 if(!match(kp->mask, state))
3666                         continue;
3667
3668                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3669                         continue;
3670                 if(term.numlock && kp->appkey == 2)
3671                         continue;
3672
3673                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3674                         continue;
3675
3676                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3677                         continue;
3678
3679                 return kp->s;
3680         }
3681
3682         return NULL;
3683 }
3684
3685 void
3686 kpress(XEvent *ev) {
3687         XKeyEvent *e = &ev->xkey;
3688         KeySym ksym;
3689         char buf[32], *customkey;
3690         int len;
3691         long c;
3692         Status status;
3693         Shortcut *bp;
3694
3695         if(IS_SET(MODE_KBDLOCK))
3696                 return;
3697
3698         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3699         /* 1. shortcuts */
3700         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3701                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3702                         bp->func(&(bp->arg));
3703                         return;
3704                 }
3705         }
3706
3707         /* 2. custom keys from config.h */
3708         if((customkey = kmap(ksym, e->state))) {
3709                 ttysend(customkey, strlen(customkey));
3710                 return;
3711         }
3712
3713         /* 3. composed string from input method */
3714         if(len == 0)
3715                 return;
3716         if(len == 1 && e->state & Mod1Mask) {
3717                 if(IS_SET(MODE_8BIT)) {
3718                         if(*buf < 0177) {
3719                                 c = *buf | 0x80;
3720                                 len = utf8encode(c, buf, UTF_SIZ);
3721                         }
3722                 } else {
3723                         buf[1] = buf[0];
3724                         buf[0] = '\033';
3725                         len = 2;
3726                 }
3727         }
3728         ttysend(buf, len);
3729 }
3730
3731
3732 void
3733 cmessage(XEvent *e) {
3734         /*
3735          * See xembed specs
3736          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3737          */
3738         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3739                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3740                         xw.state |= WIN_FOCUSED;
3741                         xseturgency(0);
3742                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3743                         xw.state &= ~WIN_FOCUSED;
3744                 }
3745         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3746                 /* Send SIGHUP to shell */
3747                 kill(pid, SIGHUP);
3748                 exit(EXIT_SUCCESS);
3749         }
3750 }
3751
3752 void
3753 cresize(int width, int height) {
3754         int col, row;
3755
3756         if(width != 0)
3757                 xw.w = width;
3758         if(height != 0)
3759                 xw.h = height;
3760
3761         col = (xw.w - 2 * borderpx) / xw.cw;
3762         row = (xw.h - 2 * borderpx) / xw.ch;
3763
3764         tresize(col, row);
3765         xresize(col, row);
3766         ttyresize();
3767 }
3768
3769 void
3770 resize(XEvent *e) {
3771         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3772                 return;
3773
3774         cresize(e->xconfigure.width, e->xconfigure.height);
3775 }
3776
3777 void
3778 run(void) {
3779         XEvent ev;
3780         int w = xw.w, h = xw.h;
3781         fd_set rfd;
3782         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3783         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3784         long deltatime;
3785
3786         /* Waiting for window mapping */
3787         while(1) {
3788                 XNextEvent(xw.dpy, &ev);
3789                 if(ev.type == ConfigureNotify) {
3790                         w = ev.xconfigure.width;
3791                         h = ev.xconfigure.height;
3792                 } else if(ev.type == MapNotify) {
3793                         break;
3794                 }
3795         }
3796
3797         ttynew();
3798         cresize(w, h);
3799
3800         clock_gettime(CLOCK_MONOTONIC, &last);
3801         lastblink = last;
3802
3803         for(xev = actionfps;;) {
3804                 FD_ZERO(&rfd);
3805                 FD_SET(cmdfd, &rfd);
3806                 FD_SET(xfd, &rfd);
3807
3808                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3809                         if(errno == EINTR)
3810                                 continue;
3811                         die("select failed: %s\n", strerror(errno));
3812                 }
3813                 if(FD_ISSET(cmdfd, &rfd)) {
3814                         ttyread();
3815                         if(blinktimeout) {
3816                                 blinkset = tattrset(ATTR_BLINK);
3817                                 if(!blinkset)
3818                                         MODBIT(term.mode, 0, MODE_BLINK);
3819                         }
3820                 }
3821
3822                 if(FD_ISSET(xfd, &rfd))
3823                         xev = actionfps;
3824
3825                 clock_gettime(CLOCK_MONOTONIC, &now);
3826                 drawtimeout.tv_sec = 0;
3827                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3828                 tv = &drawtimeout;
3829
3830                 dodraw = 0;
3831                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3832                         tsetdirtattr(ATTR_BLINK);
3833                         term.mode ^= MODE_BLINK;
3834                         lastblink = now;
3835                         dodraw = 1;
3836                 }
3837                 deltatime = TIMEDIFF(now, last);
3838                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3839                                 || deltatime < 0) {
3840                         dodraw = 1;
3841                         last = now;
3842                 }
3843
3844                 if(dodraw) {
3845                         while(XPending(xw.dpy)) {
3846                                 XNextEvent(xw.dpy, &ev);
3847                                 if(XFilterEvent(&ev, None))
3848                                         continue;
3849                                 if(handler[ev.type])
3850                                         (handler[ev.type])(&ev);
3851                         }
3852
3853                         draw();
3854                         XFlush(xw.dpy);
3855
3856                         if(xev && !FD_ISSET(xfd, &rfd))
3857                                 xev--;
3858                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3859                                 if(blinkset) {
3860                                         if(TIMEDIFF(now, lastblink) \
3861                                                         > blinktimeout) {
3862                                                 drawtimeout.tv_nsec = 1000;
3863                                         } else {
3864                                                 drawtimeout.tv_nsec = (1E6 * \
3865                                                         (blinktimeout - \
3866                                                         TIMEDIFF(now,
3867                                                                 lastblink)));
3868                                         }
3869                                 } else {
3870                                         tv = NULL;
3871                                 }
3872                         }
3873                 }
3874         }
3875 }
3876
3877 void
3878 usage(void) {
3879         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3880         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3881         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3882 }
3883
3884 int
3885 main(int argc, char *argv[]) {
3886         char *titles;
3887         uint cols = 80, rows = 24;
3888
3889         xw.l = xw.t = 0;
3890         xw.isfixed = False;
3891
3892         ARGBEGIN {
3893         case 'a':
3894                 allowaltscreen = false;
3895                 break;
3896         case 'c':
3897                 opt_class = EARGF(usage());
3898                 break;
3899         case 'e':
3900                 /* eat all remaining arguments */
3901                 if(argc > 1) {
3902                         opt_cmd = &argv[1];
3903                         if(argv[1] != NULL && opt_title == NULL) {
3904                                 titles = xstrdup(argv[1]);
3905                                 opt_title = basename(titles);
3906                         }
3907                 }
3908                 goto run;
3909         case 'f':
3910                 opt_font = EARGF(usage());
3911                 break;
3912         case 'g':
3913                 xw.gm = XParseGeometry(EARGF(usage()),
3914                                 &xw.l, &xw.t, &cols, &rows);
3915                 break;
3916         case 'i':
3917                 xw.isfixed = True;
3918                 break;
3919         case 'o':
3920                 opt_io = EARGF(usage());
3921                 break;
3922         case 't':
3923                 opt_title = EARGF(usage());
3924                 break;
3925         case 'w':
3926                 opt_embed = EARGF(usage());
3927                 break;
3928         case 'v':
3929         default:
3930                 usage();
3931         } ARGEND;
3932
3933 run:
3934         setlocale(LC_CTYPE, "");
3935         XSetLocaleModifiers("");
3936         tnew(cols? cols : 1, rows? rows : 1);
3937         xinit();
3938         selinit();
3939         run();
3940
3941         return 0;
3942 }
3943