st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  80 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  81
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_BOLD      = 1 << 0,
  92         ATTR_FAINT     = 1 << 1,
  93         ATTR_ITALIC    = 1 << 2,
  94         ATTR_UNDERLINE = 1 << 3,
  95         ATTR_BLINK     = 1 << 4,
  96         ATTR_REVERSE   = 1 << 5,
  97         ATTR_INVISIBLE = 1 << 6,
  98         ATTR_STRUCK    = 1 << 7,
  99         ATTR_WRAP      = 1 << 8,
 100         ATTR_WIDE      = 1 << 9,
 101         ATTR_WDUMMY    = 1 << 10,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1 << 0,
 117         MODE_INSERT      = 1 << 1,
 118         MODE_APPKEYPAD   = 1 << 2,
 119         MODE_ALTSCREEN   = 1 << 3,
 120         MODE_CRLF        = 1 << 4,
 121         MODE_MOUSEBTN    = 1 << 5,
 122         MODE_MOUSEMOTION = 1 << 6,
 123         MODE_REVERSE     = 1 << 7,
 124         MODE_KBDLOCK     = 1 << 8,
 125         MODE_HIDE        = 1 << 9,
 126         MODE_ECHO        = 1 << 10,
 127         MODE_APPCURSOR   = 1 << 11,
 128         MODE_MOUSESGR    = 1 << 12,
 129         MODE_8BIT        = 1 << 13,
 130         MODE_BLINK       = 1 << 14,
 131         MODE_FBLINK      = 1 << 15,
 132         MODE_FOCUS       = 1 << 16,
 133         MODE_MOUSEX10    = 1 << 17,
 134         MODE_MOUSEMANY   = 1 << 18,
 135         MODE_BRCKTPASTE  = 1 << 19,
 136         MODE_PRINT       = 1 << 20,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Color;
 183
 184 typedef struct {
 185         char c[UTF_SIZ]; /* character code */
 186         ushort mode;      /* attribute flags */
 187         uint32_t fg;      /* foreground  */
 188         uint32_t bg;      /* background  */
 189 } Glyph;
 190
 191 typedef Glyph *Line;
 192
 193 typedef struct {
 194         Glyph attr; /* current char attributes */
 195         int x;
 196         int y;
 197         char state;
 198 } TCursor;
 199
 200 /* CSI Escape sequence structs */
 201 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 202 typedef struct {
 203         char buf[ESC_BUF_SIZ]; /* raw string */
 204         int len;               /* raw string length */
 205         char priv;
 206         int arg[ESC_ARG_SIZ];
 207         int narg;              /* nb of args */
 208         char mode;
 209 } CSIEscape;
 210
 211 /* STR Escape sequence structs */
 212 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 213 typedef struct {
 214         char type;             /* ESC type ... */
 215         char buf[STR_BUF_SIZ]; /* raw string */
 216         int len;               /* raw string length */
 217         char *args[STR_ARG_SIZ];
 218         int narg;              /* nb of args */
 219 } STREscape;
 220
 221 /* Internal representation of the screen */
 222 typedef struct {
 223         int row;      /* nb row */
 224         int col;      /* nb col */
 225         Line *line;   /* screen */
 226         Line *alt;    /* alternate screen */
 227         bool *dirty;  /* dirtyness of lines */
 228         TCursor c;    /* cursor */
 229         int top;      /* top    scroll limit */
 230         int bot;      /* bottom scroll limit */
 231         int mode;     /* terminal mode flags */
 232         int esc;      /* escape state flags */
 233         char trantbl[4]; /* charset table translation */
 234         int charset;  /* current charset */
 235         int icharset; /* selected charset for sequence */
 236         bool numlock; /* lock numbers in keyboard */
 237         bool *tabs;
 238 } Term;
 239
 240 /* Purely graphic info */
 241 typedef struct {
 242         Display *dpy;
 243         Colormap cmap;
 244         Window win;
 245         Drawable buf;
 246         Atom xembed, wmdeletewin, netwmname, netwmpid;
 247         XIM xim;
 248         XIC xic;
 249         Draw draw;
 250         Visual *vis;
 251         XSetWindowAttributes attrs;
 252         int scr;
 253         bool isfixed; /* is fixed geometry? */
 254         int l, t; /* left and top offset */
 255         int gm; /* geometry mask */
 256         int tw, th; /* tty width and height */
 257         int w, h; /* window width and height */
 258         int ch; /* char height */
 259         int cw; /* char width  */
 260         char state; /* focus, redraw, visible */
 261 } XWindow;
 262
 263 typedef struct {
 264         uint b;
 265         uint mask;
 266         char *s;
 267 } Mousekey;
 268
 269 typedef struct {
 270         KeySym k;
 271         uint mask;
 272         char *s;
 273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 274         signed char appkey;    /* application keypad */
 275         signed char appcursor; /* application cursor */
 276         signed char crlf;      /* crlf mode          */
 277 } Key;
 278
 279 typedef struct {
 280         int mode;
 281         int type;
 282         int snap;
 283         /*
 284          * Selection variables:
 285          * nb – normalized coordinates of the beginning of the selection
 286          * ne – normalized coordinates of the end of the selection
 287          * ob – original coordinates of the beginning of the selection
 288          * oe – original coordinates of the end of the selection
 289          */
 290         struct {
 291                 int x, y;
 292         } nb, ne, ob, oe;
 293
 294         char *clip;
 295         Atom xtarget;
 296         bool alt;
 297         struct timespec tclick1;
 298         struct timespec tclick2;
 299 } Selection;
 300
 301 typedef union {
 302         int i;
 303         uint ui;
 304         float f;
 305         const void *v;
 306 } Arg;
 307
 308 typedef struct {
 309         uint mod;
 310         KeySym keysym;
 311         void (*func)(const Arg *);
 312         const Arg arg;
 313 } Shortcut;
 314
 315 /* function definitions used in config.h */
 316 static void clippaste(const Arg *);
 317 static void numlock(const Arg *);
 318 static void selpaste(const Arg *);
 319 static void xzoom(const Arg *);
 320 static void printsel(const Arg *);
 321 static void printscreen(const Arg *) ;
 322 static void toggleprinter(const Arg *);
 323
 324 /* Config.h for applying patches and the configuration. */
 325 #include "config.h"
 326
 327 /* Font structure */
 328 typedef struct {
 329         int height;
 330         int width;
 331         int ascent;
 332         int descent;
 333         short lbearing;
 334         short rbearing;
 335         XftFont *match;
 336         FcFontSet *set;
 337         FcPattern *pattern;
 338 } Font;
 339
 340 /* Drawing Context */
 341 typedef struct {
 342         Color col[MAX(LEN(colorname), 256)];
 343         Font font, bfont, ifont, ibfont;
 344         GC gc;
 345 } DC;
 346
 347 static void die(const char *, ...);
 348 static void draw(void);
 349 static void redraw(int);
 350 static void drawregion(int, int, int, int);
 351 static void execsh(void);
 352 static void sigchld(int);
 353 static void run(void);
 354
 355 static void csidump(void);
 356 static void csihandle(void);
 357 static void csiparse(void);
 358 static void csireset(void);
 359 static int eschandle(uchar ascii);
 360 static void strdump(void);
 361 static void strhandle(void);
 362 static void strparse(void);
 363 static void strreset(void);
 364
 365 static int tattrset(int);
 366 static void tprinter(char *, size_t);
 367 static void tdumpsel(void);
 368 static void tdumpline(int);
 369 static void tdump(void);
 370 static void tclearregion(int, int, int, int);
 371 static void tcursor(int);
 372 static void tdeletechar(int);
 373 static void tdeleteline(int);
 374 static void tinsertblank(int);
 375 static void tinsertblankline(int);
 376 static int tlinelen(int);
 377 static void tmoveto(int, int);
 378 static void tmoveato(int, int);
 379 static void tnew(int, int);
 380 static void tnewline(int);
 381 static void tputtab(int);
 382 static void tputc(char *, int);
 383 static void treset(void);
 384 static void tresize(int, int);
 385 static void tscrollup(int, int);
 386 static void tscrolldown(int, int);
 387 static void tsetattr(int *, int);
 388 static void tsetchar(char *, Glyph *, int, int);
 389 static void tsetscroll(int, int);
 390 static void tswapscreen(void);
 391 static void tsetdirt(int, int);
 392 static void tsetdirtattr(int);
 393 static void tsetmode(bool, bool, int *, int);
 394 static void tfulldirt(void);
 395 static void techo(char *, int);
 396 static void tcontrolcode(uchar );
 397 static void tdectest(char );
 398 static int32_t tdefcolor(int *, int *, int);
 399 static void tdeftran(char);
 400 static inline bool match(uint, uint);
 401 static void ttynew(void);
 402 static void ttyread(void);
 403 static void ttyresize(void);
 404 static void ttysend(char *, size_t);
 405 static void ttywrite(const char *, size_t);
 406 static void tstrsequence(uchar c);
 407
 408 static void xdraws(char *, Glyph, int, int, int, int);
 409 static void xhints(void);
 410 static void xclear(int, int, int, int);
 411 static void xdrawcursor(void);
 412 static void xinit(void);
 413 static void xloadcols(void);
 414 static int xsetcolorname(int, const char *);
 415 static int xgeommasktogravity(int);
 416 static int xloadfont(Font *, FcPattern *);
 417 static void xloadfonts(char *, double);
 418 static int xloadfontset(Font *);
 419 static void xsettitle(char *);
 420 static void xresettitle(void);
 421 static void xsetpointermotion(int);
 422 static void xseturgency(int);
 423 static void xsetsel(char *);
 424 static void xtermclear(int, int, int, int);
 425 static void xunloadfont(Font *);
 426 static void xunloadfonts(void);
 427 static void xresize(int, int);
 428
 429 static void expose(XEvent *);
 430 static void visibility(XEvent *);
 431 static void unmap(XEvent *);
 432 static char *kmap(KeySym, uint);
 433 static void kpress(XEvent *);
 434 static void cmessage(XEvent *);
 435 static void cresize(int, int);
 436 static void resize(XEvent *);
 437 static void focus(XEvent *);
 438 static void brelease(XEvent *);
 439 static void bpress(XEvent *);
 440 static void bmotion(XEvent *);
 441 static void selnotify(XEvent *);
 442 static void selclear(XEvent *);
 443 static void selrequest(XEvent *);
 444
 445 static void selinit(void);
 446 static void selnormalize(void);
 447 static inline bool selected(int, int);
 448 static char *getsel(void);
 449 static void selcopy(void);
 450 static void selscroll(int, int);
 451 static void selsnap(int, int *, int *, int);
 452 static void getbuttoninfo(XEvent *);
 453 static void mousereport(XEvent *);
 454
 455 static size_t utf8decode(char *, long *, size_t);
 456 static long utf8decodebyte(char, size_t *);
 457 static size_t utf8encode(long, char *, size_t);
 458 static char utf8encodebyte(long, size_t);
 459 static size_t utf8len(char *);
 460 static size_t utf8validate(long *, size_t);
 461
 462 static ssize_t xwrite(int, const char *, size_t);
 463 static void *xmalloc(size_t);
 464 static void *xrealloc(void *, size_t);
 465 static char *xstrdup(char *);
 466
 467 static void usage(void);
 468
 469 static void (*handler[LASTEvent])(XEvent *) = {
 470         [KeyPress] = kpress,
 471         [ClientMessage] = cmessage,
 472         [ConfigureNotify] = resize,
 473         [VisibilityNotify] = visibility,
 474         [UnmapNotify] = unmap,
 475         [Expose] = expose,
 476         [FocusIn] = focus,
 477         [FocusOut] = focus,
 478         [MotionNotify] = bmotion,
 479         [ButtonPress] = bpress,
 480         [ButtonRelease] = brelease,
 481         [SelectionClear] = selclear,
 482         [SelectionNotify] = selnotify,
 483         [SelectionRequest] = selrequest,
 484 };
 485
 486 /* Globals */
 487 static DC dc;
 488 static XWindow xw;
 489 static Term term;
 490 static CSIEscape csiescseq;
 491 static STREscape strescseq;
 492 static int cmdfd;
 493 static pid_t pid;
 494 static Selection sel;
 495 static int iofd = STDOUT_FILENO;
 496 static char **opt_cmd = NULL;
 497 static char *opt_io = NULL;
 498 static char *opt_title = NULL;
 499 static char *opt_embed = NULL;
 500 static char *opt_class = NULL;
 501 static char *opt_font = NULL;
 502 static int oldbutton = 3; /* button event on startup: 3 = release */
 503
 504 static char *usedfont = NULL;
 505 static double usedfontsize = 0;
 506
 507 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 508 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 509 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 510 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 511
 512 /* Font Ring Cache */
 513 enum {
 514         FRC_NORMAL,
 515         FRC_ITALIC,
 516         FRC_BOLD,
 517         FRC_ITALICBOLD
 518 };
 519
 520 typedef struct {
 521         XftFont *font;
 522         int flags;
 523 } Fontcache;
 524
 525 /* Fontcache is an array now. A new font will be appended to the array. */
 526 static Fontcache frc[16];
 527 static int frclen = 0;
 528
 529 ssize_t
 530 xwrite(int fd, const char *s, size_t len) {
 531         size_t aux = len;
 532
 533         while(len > 0) {
 534                 ssize_t r = write(fd, s, len);
 535                 if(r < 0)
 536                         return r;
 537                 len -= r;
 538                 s += r;
 539         }
 540         return aux;
 541 }
 542
 543 void *
 544 xmalloc(size_t len) {
 545         void *p = malloc(len);
 546
 547         if(!p)
 548                 die("Out of memory\n");
 549
 550         return p;
 551 }
 552
 553 void *
 554 xrealloc(void *p, size_t len) {
 555         if((p = realloc(p, len)) == NULL)
 556                 die("Out of memory\n");
 557
 558         return p;
 559 }
 560
 561 char *
 562 xstrdup(char *s) {
 563         if((s = strdup(s)) == NULL)
 564                 die("Out of memory\n");
 565
 566         return s;
 567 }
 568
 569 size_t
 570 utf8decode(char *c, long *u, size_t clen) {
 571         size_t i, j, len, type;
 572         long udecoded;
 573
 574         *u = UTF_INVALID;
 575         if(!clen)
 576                 return 0;
 577         udecoded = utf8decodebyte(c[0], &len);
 578         if(!BETWEEN(len, 1, UTF_SIZ))
 579                 return 1;
 580         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 581                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 582                 if(type != 0)
 583                         return j;
 584         }
 585         if(j < len)
 586                 return 0;
 587         *u = udecoded;
 588         utf8validate(u, len);
 589         return len;
 590 }
 591
 592 long
 593 utf8decodebyte(char c, size_t *i) {
 594         for(*i = 0; *i < LEN(utfmask); ++(*i))
 595                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 596                         return (uchar)c & ~utfmask[*i];
 597         return 0;
 598 }
 599
 600 size_t
 601 utf8encode(long u, char *c, size_t clen) {
 602         size_t len, i;
 603
 604         len = utf8validate(&u, 0);
 605         if(clen < len)
 606                 return 0;
 607         for(i = len - 1; i != 0; --i) {
 608                 c[i] = utf8encodebyte(u, 0);
 609                 u >>= 6;
 610         }
 611         c[0] = utf8encodebyte(u, len);
 612         return len;
 613 }
 614
 615 char
 616 utf8encodebyte(long u, size_t i) {
 617         return utfbyte[i] | (u & ~utfmask[i]);
 618 }
 619
 620 size_t
 621 utf8len(char *c) {
 622         return utf8decode(c, &(long){0}, UTF_SIZ);
 623 }
 624
 625 size_t
 626 utf8validate(long *u, size_t i) {
 627         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 628                 *u = UTF_INVALID;
 629         for(i = 1; *u > utfmax[i]; ++i)
 630                 ;
 631         return i;
 632 }
 633
 634 static void
 635 selinit(void) {
 636         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 637         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 638         sel.mode = 0;
 639         sel.ob.x = -1;
 640         sel.clip = NULL;
 641         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 642         if(sel.xtarget == None)
 643                 sel.xtarget = XA_STRING;
 644 }
 645
 646 static int
 647 x2col(int x) {
 648         x -= borderpx;
 649         x /= xw.cw;
 650
 651         return LIMIT(x, 0, term.col-1);
 652 }
 653
 654 static int
 655 y2row(int y) {
 656         y -= borderpx;
 657         y /= xw.ch;
 658
 659         return LIMIT(y, 0, term.row-1);
 660 }
 661
 662 static int tlinelen(int y) {
 663         int i = term.col;
 664
 665         if(term.line[y][i - 1].mode & ATTR_WRAP)
 666                 return i;
 667
 668         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
 669                 --i;
 670
 671         return i;
 672 }
 673
 674 static void
 675 selnormalize(void) {
 676         int i;
 677
 678         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 679                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 680                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 681         } else {
 682                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 683                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 684         }
 685         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 686         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 687
 688         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
 689         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
 690
 691         /* expand selection over line breaks */
 692         if (sel.type == SEL_RECTANGULAR)
 693                 return;
 694         i = tlinelen(sel.nb.y);
 695         if (i < sel.nb.x)
 696                 sel.nb.x = i;
 697         if (tlinelen(sel.ne.y) <= sel.ne.x)
 698                 sel.ne.x = term.col - 1;
 699 }
 700
 701 static inline bool
 702 selected(int x, int y) {
 703         if(sel.type == SEL_RECTANGULAR)
 704                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 705                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 706
 707         return BETWEEN(y, sel.nb.y, sel.ne.y)
 708             && (y != sel.nb.y || x >= sel.nb.x)
 709             && (y != sel.ne.y || x <= sel.ne.x);
 710 }
 711
 712 void
 713 selsnap(int mode, int *x, int *y, int direction) {
 714         int newx, newy, xt, yt;
 715         bool delim, prevdelim;
 716         Glyph *gp, *prevgp;
 717
 718         switch(mode) {
 719         case SNAP_WORD:
 720                 /*
 721                  * Snap around if the word wraps around at the end or
 722                  * beginning of a line.
 723                  */
 724                 prevgp = &term.line[*y][*x];
 725                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
 726                 for(;;) {
 727                         newx = *x + direction;
 728                         newy = *y;
 729                         if(!BETWEEN(newx, 0, term.col - 1)) {
 730                                 newy += direction;
 731                                 newx = (newx + term.col) % term.col;
 732                                 if (!BETWEEN(newy, 0, term.row - 1))
 733                                         break;
 734
 735                                 if(direction > 0)
 736                                         yt = *y, xt = *x;
 737                                 else
 738                                         yt = newy, xt = newx;
 739                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 740                                         break;
 741                         }
 742
 743                         if (newx >= tlinelen(newy))
 744                                 break;
 745
 746                         gp = &term.line[newy][newx];
 747                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
 748                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 749                                         || (delim && gp->c[0] != prevgp->c[0])))
 750                                 break;
 751
 752                         *x = newx;
 753                         *y = newy;
 754                         prevgp = gp;
 755                         prevdelim = delim;
 756                 }
 757                 break;
 758         case SNAP_LINE:
 759                 /*
 760                  * Snap around if the the previous line or the current one
 761                  * has set ATTR_WRAP at its end. Then the whole next or
 762                  * previous line will be selected.
 763                  */
 764                 *x = (direction < 0) ? 0 : term.col - 1;
 765                 if(direction < 0 && *y > 0) {
 766                         for(; *y > 0; *y += direction) {
 767                                 if(!(term.line[*y-1][term.col-1].mode
 768                                                 & ATTR_WRAP)) {
 769                                         break;
 770                                 }
 771                         }
 772                 } else if(direction > 0 && *y < term.row-1) {
 773                         for(; *y < term.row; *y += direction) {
 774                                 if(!(term.line[*y][term.col-1].mode
 775                                                 & ATTR_WRAP)) {
 776                                         break;
 777                                 }
 778                         }
 779                 }
 780                 break;
 781         }
 782 }
 783
 784 void
 785 getbuttoninfo(XEvent *e) {
 786         int type;
 787         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 788
 789         sel.alt = IS_SET(MODE_ALTSCREEN);
 790
 791         sel.oe.x = x2col(e->xbutton.x);
 792         sel.oe.y = y2row(e->xbutton.y);
 793         selnormalize();
 794
 795         sel.type = SEL_REGULAR;
 796         for(type = 1; type < LEN(selmasks); ++type) {
 797                 if(match(selmasks[type], state)) {
 798                         sel.type = type;
 799                         break;
 800                 }
 801         }
 802 }
 803
 804 void
 805 mousereport(XEvent *e) {
 806         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 807             button = e->xbutton.button, state = e->xbutton.state,
 808             len;
 809         char buf[40];
 810         static int ox, oy;
 811
 812         /* from urxvt */
 813         if(e->xbutton.type == MotionNotify) {
 814                 if(x == ox && y == oy)
 815                         return;
 816                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 817                         return;
 818                 /* MOUSE_MOTION: no reporting if no button is pressed */
 819                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 820                         return;
 821
 822                 button = oldbutton + 32;
 823                 ox = x;
 824                 oy = y;
 825         } else {
 826                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 827                         button = 3;
 828                 } else {
 829                         button -= Button1;
 830                         if(button >= 3)
 831                                 button += 64 - 3;
 832                 }
 833                 if(e->xbutton.type == ButtonPress) {
 834                         oldbutton = button;
 835                         ox = x;
 836                         oy = y;
 837                 } else if(e->xbutton.type == ButtonRelease) {
 838                         oldbutton = 3;
 839                         /* MODE_MOUSEX10: no button release reporting */
 840                         if(IS_SET(MODE_MOUSEX10))
 841                                 return;
 842                         if (button == 64 || button == 65)
 843                                 return;
 844                 }
 845         }
 846
 847         if(!IS_SET(MODE_MOUSEX10)) {
 848                 button += (state & ShiftMask   ? 4  : 0)
 849                         + (state & Mod4Mask    ? 8  : 0)
 850                         + (state & ControlMask ? 16 : 0);
 851         }
 852
 853         len = 0;
 854         if(IS_SET(MODE_MOUSESGR)) {
 855                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 856                                 button, x+1, y+1,
 857                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 858         } else if(x < 223 && y < 223) {
 859                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 860                                 32+button, 32+x+1, 32+y+1);
 861         } else {
 862                 return;
 863         }
 864
 865         ttywrite(buf, len);
 866 }
 867
 868 void
 869 bpress(XEvent *e) {
 870         struct timespec now;
 871         Mousekey *mk;
 872
 873         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 874                 mousereport(e);
 875                 return;
 876         }
 877
 878         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 879                 if(e->xbutton.button == mk->b
 880                                 && match(mk->mask, e->xbutton.state)) {
 881                         ttysend(mk->s, strlen(mk->s));
 882                         return;
 883                 }
 884         }
 885
 886         if(e->xbutton.button == Button1) {
 887                 clock_gettime(CLOCK_MONOTONIC, &now);
 888
 889                 /* Clear previous selection, logically and visually. */
 890                 selclear(NULL);
 891                 sel.mode = 1;
 892                 sel.type = SEL_REGULAR;
 893                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 894                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 895
 896                 /*
 897                  * If the user clicks below predefined timeouts specific
 898                  * snapping behaviour is exposed.
 899                  */
 900                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 901                         sel.snap = SNAP_LINE;
 902                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 903                         sel.snap = SNAP_WORD;
 904                 } else {
 905                         sel.snap = 0;
 906                 }
 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((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 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, *sh;
1146         const struct passwd *pw;
1147         char buf[sizeof(long) * 8 + 1];
1148
1149         errno = 0;
1150         if((pw = getpwuid(getuid())) == NULL) {
1151                 if(errno)
1152                         die("getpwuid:%s\n", strerror(errno));
1153                 else
1154                         die("who are you?\n");
1155         }
1156
1157         if (utmp)
1158                 sh = utmp;
1159         else if (pw->pw_shell[0])
1160                 sh = pw->pw_shell;
1161         else
1162                 sh = shell;
1163         args = (opt_cmd) ? opt_cmd : (char *[]){sh, NULL};
1164         snprintf(buf, sizeof(buf), "%lu", xw.win);
1165
1166         unsetenv("COLUMNS");
1167         unsetenv("LINES");
1168         unsetenv("TERMCAP");
1169         setenv("LOGNAME", pw->pw_name, 1);
1170         setenv("USER", pw->pw_name, 1);
1171         setenv("SHELL", args[0], 1);
1172         setenv("HOME", pw->pw_dir, 1);
1173         setenv("TERM", termname, 1);
1174         setenv("WINDOWID", buf, 1);
1175
1176         signal(SIGCHLD, SIG_DFL);
1177         signal(SIGHUP, SIG_DFL);
1178         signal(SIGINT, SIG_DFL);
1179         signal(SIGQUIT, SIG_DFL);
1180         signal(SIGTERM, SIG_DFL);
1181         signal(SIGALRM, SIG_DFL);
1182
1183         execvp(args[0], args);
1184         exit(EXIT_FAILURE);
1185 }
1186
1187 void
1188 sigchld(int a) {
1189         int stat, ret;
1190
1191         if(waitpid(pid, &stat, 0) < 0)
1192                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1193
1194         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1195         if (ret != EXIT_SUCCESS)
1196                 die("child finished with error '%d'\n", stat);
1197         exit(EXIT_SUCCESS);
1198 }
1199
1200 void
1201 ttynew(void) {
1202         int m, s;
1203         struct winsize w = {term.row, term.col, 0, 0};
1204
1205         /* seems to work fine on linux, openbsd and freebsd */
1206         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1207                 die("openpty failed: %s\n", strerror(errno));
1208
1209         switch(pid = fork()) {
1210         case -1:
1211                 die("fork failed\n");
1212                 break;
1213         case 0:
1214                 setsid(); /* create a new process group */
1215                 dup2(s, STDIN_FILENO);
1216                 dup2(s, STDOUT_FILENO);
1217                 dup2(s, STDERR_FILENO);
1218                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1219                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1220                 close(s);
1221                 close(m);
1222                 execsh();
1223                 break;
1224         default:
1225                 close(s);
1226                 cmdfd = m;
1227                 signal(SIGCHLD, sigchld);
1228                 if(opt_io) {
1229                         term.mode |= MODE_PRINT;
1230                         iofd = (!strcmp(opt_io, "-")) ?
1231                                   STDOUT_FILENO :
1232                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1233                         if(iofd < 0) {
1234                                 fprintf(stderr, "Error opening %s:%s\n",
1235                                         opt_io, strerror(errno));
1236                         }
1237                 }
1238                 break;
1239         }
1240 }
1241
1242 void
1243 ttyread(void) {
1244         static char buf[BUFSIZ];
1245         static int buflen = 0;
1246         char *ptr;
1247         char s[UTF_SIZ];
1248         int charsize; /* size of utf8 char in bytes */
1249         long unicodep;
1250         int ret;
1251
1252         /* append read bytes to unprocessed bytes */
1253         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1254                 die("Couldn't read from shell: %s\n", strerror(errno));
1255
1256         /* process every complete utf8 char */
1257         buflen += ret;
1258         ptr = buf;
1259         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1260                 utf8encode(unicodep, s, UTF_SIZ);
1261                 tputc(s, charsize);
1262                 ptr += charsize;
1263                 buflen -= charsize;
1264         }
1265
1266         /* keep any uncomplete utf8 char for the next call */
1267         memmove(buf, ptr, buflen);
1268 }
1269
1270 void
1271 ttywrite(const char *s, size_t n) {
1272         if(xwrite(cmdfd, s, n) == -1)
1273                 die("write error on tty: %s\n", strerror(errno));
1274 }
1275
1276 void
1277 ttysend(char *s, size_t n) {
1278         ttywrite(s, n);
1279         if(IS_SET(MODE_ECHO))
1280                 techo(s, n);
1281 }
1282
1283 void
1284 ttyresize(void) {
1285         struct winsize w;
1286
1287         w.ws_row = term.row;
1288         w.ws_col = term.col;
1289         w.ws_xpixel = xw.tw;
1290         w.ws_ypixel = xw.th;
1291         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1292                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1293 }
1294
1295 int
1296 tattrset(int attr) {
1297         int i, j;
1298
1299         for(i = 0; i < term.row-1; i++) {
1300                 for(j = 0; j < term.col-1; j++) {
1301                         if(term.line[i][j].mode & attr)
1302                                 return 1;
1303                 }
1304         }
1305
1306         return 0;
1307 }
1308
1309 void
1310 tsetdirt(int top, int bot) {
1311         int i;
1312
1313         LIMIT(top, 0, term.row-1);
1314         LIMIT(bot, 0, term.row-1);
1315
1316         for(i = top; i <= bot; i++)
1317                 term.dirty[i] = 1;
1318 }
1319
1320 void
1321 tsetdirtattr(int attr) {
1322         int i, j;
1323
1324         for(i = 0; i < term.row-1; i++) {
1325                 for(j = 0; j < term.col-1; j++) {
1326                         if(term.line[i][j].mode & attr) {
1327                                 tsetdirt(i, i);
1328                                 break;
1329                         }
1330                 }
1331         }
1332 }
1333
1334 void
1335 tfulldirt(void) {
1336         tsetdirt(0, term.row-1);
1337 }
1338
1339 void
1340 tcursor(int mode) {
1341         static TCursor c[2];
1342         bool alt = IS_SET(MODE_ALTSCREEN);
1343
1344         if(mode == CURSOR_SAVE) {
1345                 c[alt] = term.c;
1346         } else if(mode == CURSOR_LOAD) {
1347                 term.c = c[alt];
1348                 tmoveto(c[alt].x, c[alt].y);
1349         }
1350 }
1351
1352 void
1353 treset(void) {
1354         uint i;
1355
1356         term.c = (TCursor){{
1357                 .mode = ATTR_NULL,
1358                 .fg = defaultfg,
1359                 .bg = defaultbg
1360         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1361
1362         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1363         for(i = tabspaces; i < term.col; i += tabspaces)
1364                 term.tabs[i] = 1;
1365         term.top = 0;
1366         term.bot = term.row - 1;
1367         term.mode = MODE_WRAP;
1368         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1369         term.charset = 0;
1370
1371         for(i = 0; i < 2; i++) {
1372                 tmoveto(0, 0);
1373                 tcursor(CURSOR_SAVE);
1374                 tclearregion(0, 0, term.col-1, term.row-1);
1375                 tswapscreen();
1376         }
1377 }
1378
1379 void
1380 tnew(int col, int row) {
1381         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1382         tresize(col, row);
1383         term.numlock = 1;
1384
1385         treset();
1386 }
1387
1388 void
1389 tswapscreen(void) {
1390         Line *tmp = term.line;
1391
1392         term.line = term.alt;
1393         term.alt = tmp;
1394         term.mode ^= MODE_ALTSCREEN;
1395         tfulldirt();
1396 }
1397
1398 void
1399 tscrolldown(int orig, int n) {
1400         int i;
1401         Line temp;
1402
1403         LIMIT(n, 0, term.bot-orig+1);
1404
1405         tsetdirt(orig, term.bot-n);
1406         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1407
1408         for(i = term.bot; i >= orig+n; i--) {
1409                 temp = term.line[i];
1410                 term.line[i] = term.line[i-n];
1411                 term.line[i-n] = temp;
1412         }
1413
1414         selscroll(orig, n);
1415 }
1416
1417 void
1418 tscrollup(int orig, int n) {
1419         int i;
1420         Line temp;
1421
1422         LIMIT(n, 0, term.bot-orig+1);
1423
1424         tclearregion(0, orig, term.col-1, orig+n-1);
1425         tsetdirt(orig+n, term.bot);
1426
1427         for(i = orig; i <= term.bot-n; i++) {
1428                 temp = term.line[i];
1429                 term.line[i] = term.line[i+n];
1430                 term.line[i+n] = temp;
1431         }
1432
1433         selscroll(orig, -n);
1434 }
1435
1436 void
1437 selscroll(int orig, int n) {
1438         if(sel.ob.x == -1)
1439                 return;
1440
1441         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1442                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1443                         selclear(NULL);
1444                         return;
1445                 }
1446                 if(sel.type == SEL_RECTANGULAR) {
1447                         if(sel.ob.y < term.top)
1448                                 sel.ob.y = term.top;
1449                         if(sel.oe.y > term.bot)
1450                                 sel.oe.y = term.bot;
1451                 } else {
1452                         if(sel.ob.y < term.top) {
1453                                 sel.ob.y = term.top;
1454                                 sel.ob.x = 0;
1455                         }
1456                         if(sel.oe.y > term.bot) {
1457                                 sel.oe.y = term.bot;
1458                                 sel.oe.x = term.col;
1459                         }
1460                 }
1461                 selnormalize();
1462         }
1463 }
1464
1465 void
1466 tnewline(int first_col) {
1467         int y = term.c.y;
1468
1469         if(y == term.bot) {
1470                 tscrollup(term.top, 1);
1471         } else {
1472                 y++;
1473         }
1474         tmoveto(first_col ? 0 : term.c.x, y);
1475 }
1476
1477 void
1478 csiparse(void) {
1479         char *p = csiescseq.buf, *np;
1480         long int v;
1481
1482         csiescseq.narg = 0;
1483         if(*p == '?') {
1484                 csiescseq.priv = 1;
1485                 p++;
1486         }
1487
1488         csiescseq.buf[csiescseq.len] = '\0';
1489         while(p < csiescseq.buf+csiescseq.len) {
1490                 np = NULL;
1491                 v = strtol(p, &np, 10);
1492                 if(np == p)
1493                         v = 0;
1494                 if(v == LONG_MAX || v == LONG_MIN)
1495                         v = -1;
1496                 csiescseq.arg[csiescseq.narg++] = v;
1497                 p = np;
1498                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1499                         break;
1500                 p++;
1501         }
1502         csiescseq.mode = *p;
1503 }
1504
1505 /* for absolute user moves, when decom is set */
1506 void
1507 tmoveato(int x, int y) {
1508         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1509 }
1510
1511 void
1512 tmoveto(int x, int y) {
1513         int miny, maxy;
1514
1515         if(term.c.state & CURSOR_ORIGIN) {
1516                 miny = term.top;
1517                 maxy = term.bot;
1518         } else {
1519                 miny = 0;
1520                 maxy = term.row - 1;
1521         }
1522         LIMIT(x, 0, term.col-1);
1523         LIMIT(y, miny, maxy);
1524         term.c.state &= ~CURSOR_WRAPNEXT;
1525         term.c.x = x;
1526         term.c.y = y;
1527 }
1528
1529 void
1530 tsetchar(char *c, Glyph *attr, int x, int y) {
1531         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1532                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1533                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1534                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1535                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1536                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1537                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1538                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1539                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1540         };
1541
1542         /*
1543          * The table is proudly stolen from rxvt.
1544          */
1545         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1546                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1547                         c = vt100_0[c[0] - 0x41];
1548                 }
1549         }
1550
1551         if(term.line[y][x].mode & ATTR_WIDE) {
1552                 if(x+1 < term.col) {
1553                         term.line[y][x+1].c[0] = ' ';
1554                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1555                 }
1556         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1557                 term.line[y][x-1].c[0] = ' ';
1558                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1559         }
1560
1561         term.dirty[y] = 1;
1562         term.line[y][x] = *attr;
1563         memcpy(term.line[y][x].c, c, UTF_SIZ);
1564 }
1565
1566 void
1567 tclearregion(int x1, int y1, int x2, int y2) {
1568         int x, y, temp;
1569         Glyph *gp;
1570
1571         if(x1 > x2)
1572                 temp = x1, x1 = x2, x2 = temp;
1573         if(y1 > y2)
1574                 temp = y1, y1 = y2, y2 = temp;
1575
1576         LIMIT(x1, 0, term.col-1);
1577         LIMIT(x2, 0, term.col-1);
1578         LIMIT(y1, 0, term.row-1);
1579         LIMIT(y2, 0, term.row-1);
1580
1581         for(y = y1; y <= y2; y++) {
1582                 term.dirty[y] = 1;
1583                 for(x = x1; x <= x2; x++) {
1584                         gp = &term.line[y][x];
1585                         if(selected(x, y))
1586                                 selclear(NULL);
1587                         gp->fg = term.c.attr.fg;
1588                         gp->bg = term.c.attr.bg;
1589                         gp->mode = 0;
1590                         memcpy(gp->c, " ", 2);
1591                 }
1592         }
1593 }
1594
1595 void
1596 tdeletechar(int n) {
1597         int dst, src, size;
1598         Glyph *line;
1599
1600         LIMIT(n, 0, term.col - term.c.x);
1601
1602         dst = term.c.x;
1603         src = term.c.x + n;
1604         size = term.col - src;
1605         line = term.line[term.c.y];
1606
1607         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1608         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1609 }
1610
1611 void
1612 tinsertblank(int n) {
1613         int dst, src, size;
1614         Glyph *line;
1615
1616         LIMIT(n, 0, term.col - term.c.x);
1617
1618         dst = term.c.x + n;
1619         src = term.c.x;
1620         size = term.col - dst;
1621         line = term.line[term.c.y];
1622
1623         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1624         tclearregion(src, term.c.y, dst - 1, term.c.y);
1625 }
1626
1627 void
1628 tinsertblankline(int n) {
1629         if(BETWEEN(term.c.y, term.top, term.bot))
1630                 tscrolldown(term.c.y, n);
1631 }
1632
1633 void
1634 tdeleteline(int n) {
1635         if(BETWEEN(term.c.y, term.top, term.bot))
1636                 tscrollup(term.c.y, n);
1637 }
1638
1639 int32_t
1640 tdefcolor(int *attr, int *npar, int l) {
1641         int32_t idx = -1;
1642         uint r, g, b;
1643
1644         switch (attr[*npar + 1]) {
1645         case 2: /* direct color in RGB space */
1646                 if (*npar + 4 >= l) {
1647                         fprintf(stderr,
1648                                 "erresc(38): Incorrect number of parameters (%d)\n",
1649                                 *npar);
1650                         break;
1651                 }
1652                 r = attr[*npar + 2];
1653                 g = attr[*npar + 3];
1654                 b = attr[*npar + 4];
1655                 *npar += 4;
1656                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1657                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1658                                 r, g, b);
1659                 else
1660                         idx = TRUECOLOR(r, g, b);
1661                 break;
1662         case 5: /* indexed color */
1663                 if (*npar + 2 >= l) {
1664                         fprintf(stderr,
1665                                 "erresc(38): Incorrect number of parameters (%d)\n",
1666                                 *npar);
1667                         break;
1668                 }
1669                 *npar += 2;
1670                 if(!BETWEEN(attr[*npar], 0, 255))
1671                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1672                 else
1673                         idx = attr[*npar];
1674                 break;
1675         case 0: /* implemented defined (only foreground) */
1676         case 1: /* transparent */
1677         case 3: /* direct color in CMY space */
1678         case 4: /* direct color in CMYK space */
1679         default:
1680                 fprintf(stderr,
1681                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1682                 break;
1683         }
1684
1685         return idx;
1686 }
1687
1688 void
1689 tsetattr(int *attr, int l) {
1690         int i;
1691         int32_t idx;
1692
1693         for(i = 0; i < l; i++) {
1694                 switch(attr[i]) {
1695                 case 0:
1696                         term.c.attr.mode &= ~(
1697                                 ATTR_BOLD       |
1698                                 ATTR_FAINT      |
1699                                 ATTR_ITALIC     |
1700                                 ATTR_UNDERLINE  |
1701                                 ATTR_BLINK      |
1702                                 ATTR_REVERSE    |
1703                                 ATTR_INVISIBLE  |
1704                                 ATTR_STRUCK     );
1705                         term.c.attr.fg = defaultfg;
1706                         term.c.attr.bg = defaultbg;
1707                         break;
1708                 case 1:
1709                         term.c.attr.mode |= ATTR_BOLD;
1710                         break;
1711                 case 2:
1712                         term.c.attr.mode |= ATTR_FAINT;
1713                         break;
1714                 case 3:
1715                         term.c.attr.mode |= ATTR_ITALIC;
1716                         break;
1717                 case 4:
1718                         term.c.attr.mode |= ATTR_UNDERLINE;
1719                         break;
1720                 case 5: /* slow blink */
1721                         /* FALLTHROUGH */
1722                 case 6: /* rapid blink */
1723                         term.c.attr.mode |= ATTR_BLINK;
1724                         break;
1725                 case 7:
1726                         term.c.attr.mode |= ATTR_REVERSE;
1727                         break;
1728                 case 8:
1729                         term.c.attr.mode |= ATTR_INVISIBLE;
1730                         break;
1731                 case 9:
1732                         term.c.attr.mode |= ATTR_STRUCK;
1733                         break;
1734                 case 22:
1735                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1736                         break;
1737                 case 23:
1738                         term.c.attr.mode &= ~ATTR_ITALIC;
1739                         break;
1740                 case 24:
1741                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1742                         break;
1743                 case 25:
1744                         term.c.attr.mode &= ~ATTR_BLINK;
1745                         break;
1746                 case 27:
1747                         term.c.attr.mode &= ~ATTR_REVERSE;
1748                         break;
1749                 case 28:
1750                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1751                         break;
1752                 case 29:
1753                         term.c.attr.mode &= ~ATTR_STRUCK;
1754                         break;
1755                 case 38:
1756                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1757                                 term.c.attr.fg = idx;
1758                         break;
1759                 case 39:
1760                         term.c.attr.fg = defaultfg;
1761                         break;
1762                 case 48:
1763                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1764                                 term.c.attr.bg = idx;
1765                         break;
1766                 case 49:
1767                         term.c.attr.bg = defaultbg;
1768                         break;
1769                 default:
1770                         if(BETWEEN(attr[i], 30, 37)) {
1771                                 term.c.attr.fg = attr[i] - 30;
1772                         } else if(BETWEEN(attr[i], 40, 47)) {
1773                                 term.c.attr.bg = attr[i] - 40;
1774                         } else if(BETWEEN(attr[i], 90, 97)) {
1775                                 term.c.attr.fg = attr[i] - 90 + 8;
1776                         } else if(BETWEEN(attr[i], 100, 107)) {
1777                                 term.c.attr.bg = attr[i] - 100 + 8;
1778                         } else {
1779                                 fprintf(stderr,
1780                                         "erresc(default): gfx attr %d unknown\n",
1781                                         attr[i]), csidump();
1782                         }
1783                         break;
1784                 }
1785         }
1786 }
1787
1788 void
1789 tsetscroll(int t, int b) {
1790         int temp;
1791
1792         LIMIT(t, 0, term.row-1);
1793         LIMIT(b, 0, term.row-1);
1794         if(t > b) {
1795                 temp = t;
1796                 t = b;
1797                 b = temp;
1798         }
1799         term.top = t;
1800         term.bot = b;
1801 }
1802
1803 void
1804 tsetmode(bool priv, bool set, int *args, int narg) {
1805         int *lim, mode;
1806         bool alt;
1807
1808         for(lim = args + narg; args < lim; ++args) {
1809                 if(priv) {
1810                         switch(*args) {
1811                         case 1: /* DECCKM -- Cursor key */
1812                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1813                                 break;
1814                         case 5: /* DECSCNM -- Reverse video */
1815                                 mode = term.mode;
1816                                 MODBIT(term.mode, set, MODE_REVERSE);
1817                                 if(mode != term.mode)
1818                                         redraw(REDRAW_TIMEOUT);
1819                                 break;
1820                         case 6: /* DECOM -- Origin */
1821                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1822                                 tmoveato(0, 0);
1823                                 break;
1824                         case 7: /* DECAWM -- Auto wrap */
1825                                 MODBIT(term.mode, set, MODE_WRAP);
1826                                 break;
1827                         case 0:  /* Error (IGNORED) */
1828                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1829                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1830                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1831                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1832                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1833                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1834                         case 42: /* DECNRCM -- National characters (IGNORED) */
1835                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1836                                 break;
1837                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1838                                 MODBIT(term.mode, !set, MODE_HIDE);
1839                                 break;
1840                         case 9:    /* X10 mouse compatibility mode */
1841                                 xsetpointermotion(0);
1842                                 MODBIT(term.mode, 0, MODE_MOUSE);
1843                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1844                                 break;
1845                         case 1000: /* 1000: report button press */
1846                                 xsetpointermotion(0);
1847                                 MODBIT(term.mode, 0, MODE_MOUSE);
1848                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1849                                 break;
1850                         case 1002: /* 1002: report motion on button press */
1851                                 xsetpointermotion(0);
1852                                 MODBIT(term.mode, 0, MODE_MOUSE);
1853                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1854                                 break;
1855                         case 1003: /* 1003: enable all mouse motions */
1856                                 xsetpointermotion(set);
1857                                 MODBIT(term.mode, 0, MODE_MOUSE);
1858                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1859                                 break;
1860                         case 1004: /* 1004: send focus events to tty */
1861                                 MODBIT(term.mode, set, MODE_FOCUS);
1862                                 break;
1863                         case 1006: /* 1006: extended reporting mode */
1864                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1865                                 break;
1866                         case 1034:
1867                                 MODBIT(term.mode, set, MODE_8BIT);
1868                                 break;
1869                         case 1049: /* swap screen & set/restore cursor as xterm */
1870                                 if (!allowaltscreen)
1871                                         break;
1872                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1873                                 /* FALLTHROUGH */
1874                         case 47: /* swap screen */
1875                         case 1047:
1876                                 if (!allowaltscreen)
1877                                         break;
1878                                 alt = IS_SET(MODE_ALTSCREEN);
1879                                 if(alt) {
1880                                         tclearregion(0, 0, term.col-1,
1881                                                         term.row-1);
1882                                 }
1883                                 if(set ^ alt) /* set is always 1 or 0 */
1884                                         tswapscreen();
1885                                 if(*args != 1049)
1886                                         break;
1887                                 /* FALLTHROUGH */
1888                         case 1048:
1889                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1890                                 break;
1891                         case 2004: /* 2004: bracketed paste mode */
1892                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1893                                 break;
1894                         /* Not implemented mouse modes. See comments there. */
1895                         case 1001: /* mouse highlight mode; can hang the
1896                                       terminal by design when implemented. */
1897                         case 1005: /* UTF-8 mouse mode; will confuse
1898                                       applications not supporting UTF-8
1899                                       and luit. */
1900                         case 1015: /* urxvt mangled mouse mode; incompatible
1901                                       and can be mistaken for other control
1902                                       codes. */
1903                         default:
1904                                 fprintf(stderr,
1905                                         "erresc: unknown private set/reset mode %d\n",
1906                                         *args);
1907                                 break;
1908                         }
1909                 } else {
1910                         switch(*args) {
1911                         case 0:  /* Error (IGNORED) */
1912                                 break;
1913                         case 2:  /* KAM -- keyboard action */
1914                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1915                                 break;
1916                         case 4:  /* IRM -- Insertion-replacement */
1917                                 MODBIT(term.mode, set, MODE_INSERT);
1918                                 break;
1919                         case 12: /* SRM -- Send/Receive */
1920                                 MODBIT(term.mode, !set, MODE_ECHO);
1921                                 break;
1922                         case 20: /* LNM -- Linefeed/new line */
1923                                 MODBIT(term.mode, set, MODE_CRLF);
1924                                 break;
1925                         default:
1926                                 fprintf(stderr,
1927                                         "erresc: unknown set/reset mode %d\n",
1928                                         *args);
1929                                 break;
1930                         }
1931                 }
1932         }
1933 }
1934
1935 void
1936 csihandle(void) {
1937         char buf[40];
1938         int len;
1939
1940         switch(csiescseq.mode) {
1941         default:
1942         unknown:
1943                 fprintf(stderr, "erresc: unknown csi ");
1944                 csidump();
1945                 /* die(""); */
1946                 break;
1947         case '@': /* ICH -- Insert <n> blank char */
1948                 DEFAULT(csiescseq.arg[0], 1);
1949                 tinsertblank(csiescseq.arg[0]);
1950                 break;
1951         case 'A': /* CUU -- Cursor <n> Up */
1952                 DEFAULT(csiescseq.arg[0], 1);
1953                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1954                 break;
1955         case 'B': /* CUD -- Cursor <n> Down */
1956         case 'e': /* VPR --Cursor <n> Down */
1957                 DEFAULT(csiescseq.arg[0], 1);
1958                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1959                 break;
1960         case 'i': /* MC -- Media Copy */
1961                 switch(csiescseq.arg[0]) {
1962                 case 0:
1963                         tdump();
1964                         break;
1965                 case 1:
1966                         tdumpline(term.c.y);
1967                         break;
1968                 case 2:
1969                         tdumpsel();
1970                         break;
1971                 case 4:
1972                         term.mode &= ~MODE_PRINT;
1973                         break;
1974                 case 5:
1975                         term.mode |= MODE_PRINT;
1976                         break;
1977                 }
1978                 break;
1979         case 'c': /* DA -- Device Attributes */
1980                 if(csiescseq.arg[0] == 0)
1981                         ttywrite(vtiden, sizeof(vtiden) - 1);
1982                 break;
1983         case 'C': /* CUF -- Cursor <n> Forward */
1984         case 'a': /* HPR -- Cursor <n> Forward */
1985                 DEFAULT(csiescseq.arg[0], 1);
1986                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1987                 break;
1988         case 'D': /* CUB -- Cursor <n> Backward */
1989                 DEFAULT(csiescseq.arg[0], 1);
1990                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1991                 break;
1992         case 'E': /* CNL -- Cursor <n> Down and first col */
1993                 DEFAULT(csiescseq.arg[0], 1);
1994                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1995                 break;
1996         case 'F': /* CPL -- Cursor <n> Up and first col */
1997                 DEFAULT(csiescseq.arg[0], 1);
1998                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1999                 break;
2000         case 'g': /* TBC -- Tabulation clear */
2001                 switch(csiescseq.arg[0]) {
2002                 case 0: /* clear current tab stop */
2003                         term.tabs[term.c.x] = 0;
2004                         break;
2005                 case 3: /* clear all the tabs */
2006                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2007                         break;
2008                 default:
2009                         goto unknown;
2010                 }
2011                 break;
2012         case 'G': /* CHA -- Move to <col> */
2013         case '`': /* HPA */
2014                 DEFAULT(csiescseq.arg[0], 1);
2015                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2016                 break;
2017         case 'H': /* CUP -- Move to <row> <col> */
2018         case 'f': /* HVP */
2019                 DEFAULT(csiescseq.arg[0], 1);
2020                 DEFAULT(csiescseq.arg[1], 1);
2021                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2022                 break;
2023         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2024                 DEFAULT(csiescseq.arg[0], 1);
2025                 tputtab(csiescseq.arg[0]);
2026                 break;
2027         case 'J': /* ED -- Clear screen */
2028                 selclear(NULL);
2029                 switch(csiescseq.arg[0]) {
2030                 case 0: /* below */
2031                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2032                         if(term.c.y < term.row-1) {
2033                                 tclearregion(0, term.c.y+1, term.col-1,
2034                                                 term.row-1);
2035                         }
2036                         break;
2037                 case 1: /* above */
2038                         if(term.c.y > 1)
2039                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2040                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2041                         break;
2042                 case 2: /* all */
2043                         tclearregion(0, 0, term.col-1, term.row-1);
2044                         break;
2045                 default:
2046                         goto unknown;
2047                 }
2048                 break;
2049         case 'K': /* EL -- Clear line */
2050                 switch(csiescseq.arg[0]) {
2051                 case 0: /* right */
2052                         tclearregion(term.c.x, term.c.y, term.col-1,
2053                                         term.c.y);
2054                         break;
2055                 case 1: /* left */
2056                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2057                         break;
2058                 case 2: /* all */
2059                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2060                         break;
2061                 }
2062                 break;
2063         case 'S': /* SU -- Scroll <n> line up */
2064                 DEFAULT(csiescseq.arg[0], 1);
2065                 tscrollup(term.top, csiescseq.arg[0]);
2066                 break;
2067         case 'T': /* SD -- Scroll <n> line down */
2068                 DEFAULT(csiescseq.arg[0], 1);
2069                 tscrolldown(term.top, csiescseq.arg[0]);
2070                 break;
2071         case 'L': /* IL -- Insert <n> blank lines */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 tinsertblankline(csiescseq.arg[0]);
2074                 break;
2075         case 'l': /* RM -- Reset Mode */
2076                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2077                 break;
2078         case 'M': /* DL -- Delete <n> lines */
2079                 DEFAULT(csiescseq.arg[0], 1);
2080                 tdeleteline(csiescseq.arg[0]);
2081                 break;
2082         case 'X': /* ECH -- Erase <n> char */
2083                 DEFAULT(csiescseq.arg[0], 1);
2084                 tclearregion(term.c.x, term.c.y,
2085                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2086                 break;
2087         case 'P': /* DCH -- Delete <n> char */
2088                 DEFAULT(csiescseq.arg[0], 1);
2089                 tdeletechar(csiescseq.arg[0]);
2090                 break;
2091         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2092                 DEFAULT(csiescseq.arg[0], 1);
2093                 tputtab(-csiescseq.arg[0]);
2094                 break;
2095         case 'd': /* VPA -- Move to <row> */
2096                 DEFAULT(csiescseq.arg[0], 1);
2097                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2098                 break;
2099         case 'h': /* SM -- Set terminal mode */
2100                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2101                 break;
2102         case 'm': /* SGR -- Terminal attribute (color) */
2103                 tsetattr(csiescseq.arg, csiescseq.narg);
2104                 break;
2105         case 'n': /* DSR – Device Status Report (cursor position) */
2106                 if (csiescseq.arg[0] == 6) {
2107                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2108                                         term.c.y+1, term.c.x+1);
2109                         ttywrite(buf, len);
2110                 }
2111                 break;
2112         case 'r': /* DECSTBM -- Set Scrolling Region */
2113                 if(csiescseq.priv) {
2114                         goto unknown;
2115                 } else {
2116                         DEFAULT(csiescseq.arg[0], 1);
2117                         DEFAULT(csiescseq.arg[1], term.row);
2118                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2119                         tmoveato(0, 0);
2120                 }
2121                 break;
2122         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2123                 tcursor(CURSOR_SAVE);
2124                 break;
2125         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2126                 tcursor(CURSOR_LOAD);
2127                 break;
2128         }
2129 }
2130
2131 void
2132 csidump(void) {
2133         int i;
2134         uint c;
2135
2136         printf("ESC[");
2137         for(i = 0; i < csiescseq.len; i++) {
2138                 c = csiescseq.buf[i] & 0xff;
2139                 if(isprint(c)) {
2140                         putchar(c);
2141                 } else if(c == '\n') {
2142                         printf("(\\n)");
2143                 } else if(c == '\r') {
2144                         printf("(\\r)");
2145                 } else if(c == 0x1b) {
2146                         printf("(\\e)");
2147                 } else {
2148                         printf("(%02x)", c);
2149                 }
2150         }
2151         putchar('\n');
2152 }
2153
2154 void
2155 csireset(void) {
2156         memset(&csiescseq, 0, sizeof(csiescseq));
2157 }
2158
2159 void
2160 strhandle(void) {
2161         char *p = NULL;
2162         int j, narg, par;
2163
2164         term.esc &= ~(ESC_STR_END|ESC_STR);
2165         strparse();
2166         narg = strescseq.narg;
2167         par = atoi(strescseq.args[0]);
2168
2169         switch(strescseq.type) {
2170         case ']': /* OSC -- Operating System Command */
2171                 switch(par) {
2172                 case 0:
2173                 case 1:
2174                 case 2:
2175                         if(narg > 1)
2176                                 xsettitle(strescseq.args[1]);
2177                         return;
2178                 case 4: /* color set */
2179                         if(narg < 3)
2180                                 break;
2181                         p = strescseq.args[2];
2182                         /* FALLTHROUGH */
2183                 case 104: /* color reset, here p = NULL */
2184                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2185                         if(xsetcolorname(j, p)) {
2186                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2187                         } else {
2188                                 /*
2189                                  * TODO if defaultbg color is changed, borders
2190                                  * are dirty
2191                                  */
2192                                 redraw(0);
2193                         }
2194                         return;
2195                 }
2196                 break;
2197         case 'k': /* old title set compatibility */
2198                 xsettitle(strescseq.args[0]);
2199                 return;
2200         case 'P': /* DCS -- Device Control String */
2201         case '_': /* APC -- Application Program Command */
2202         case '^': /* PM -- Privacy Message */
2203                 return;
2204         }
2205
2206         fprintf(stderr, "erresc: unknown str ");
2207         strdump();
2208 }
2209
2210 void
2211 strparse(void) {
2212         char *p = strescseq.buf;
2213
2214         strescseq.narg = 0;
2215         strescseq.buf[strescseq.len] = '\0';
2216         while(p && strescseq.narg < STR_ARG_SIZ)
2217                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2218 }
2219
2220 void
2221 strdump(void) {
2222         int i;
2223         uint c;
2224
2225         printf("ESC%c", strescseq.type);
2226         for(i = 0; i < strescseq.len; i++) {
2227                 c = strescseq.buf[i] & 0xff;
2228                 if(c == '\0') {
2229                         return;
2230                 } else if(isprint(c)) {
2231                         putchar(c);
2232                 } else if(c == '\n') {
2233                         printf("(\\n)");
2234                 } else if(c == '\r') {
2235                         printf("(\\r)");
2236                 } else if(c == 0x1b) {
2237                         printf("(\\e)");
2238                 } else {
2239                         printf("(%02x)", c);
2240                 }
2241         }
2242         printf("ESC\\\n");
2243 }
2244
2245 void
2246 strreset(void) {
2247         memset(&strescseq, 0, sizeof(strescseq));
2248 }
2249
2250 void
2251 tprinter(char *s, size_t len) {
2252         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2253                 fprintf(stderr, "Error writing in %s:%s\n",
2254                         opt_io, strerror(errno));
2255                 close(iofd);
2256                 iofd = -1;
2257         }
2258 }
2259
2260 void
2261 toggleprinter(const Arg *arg) {
2262         term.mode ^= MODE_PRINT;
2263 }
2264
2265 void
2266 printscreen(const Arg *arg) {
2267         tdump();
2268 }
2269
2270 void
2271 printsel(const Arg *arg) {
2272         tdumpsel();
2273 }
2274
2275 void
2276 tdumpsel(void) {
2277         char *ptr;
2278
2279         if((ptr = getsel())) {
2280                 tprinter(ptr, strlen(ptr));
2281                 free(ptr);
2282         }
2283 }
2284
2285 void
2286 tdumpline(int n) {
2287         Glyph *bp, *end;
2288
2289         bp = &term.line[n][0];
2290         end = &bp[MIN(tlinelen(n), term.col) - 1];
2291         if(bp != end || bp->c[0] != ' ') {
2292                 for( ;bp <= end; ++bp)
2293                         tprinter(bp->c, utf8len(bp->c));
2294         }
2295         tprinter("\n", 1);
2296 }
2297
2298 void
2299 tdump(void) {
2300         int i;
2301
2302         for(i = 0; i < term.row; ++i)
2303                 tdumpline(i);
2304 }
2305
2306 void
2307 tputtab(int n) {
2308         uint x = term.c.x;
2309
2310         if(n > 0) {
2311                 while(x < term.col && n--)
2312                         for(++x; x < term.col && !term.tabs[x]; ++x)
2313                                 /* nothing */ ;
2314         } else if(n < 0) {
2315                 while(x > 0 && n++)
2316                         for(--x; x > 0 && !term.tabs[x]; --x)
2317                                 /* nothing */ ;
2318         }
2319         tmoveto(x, term.c.y);
2320 }
2321
2322 void
2323 techo(char *buf, int len) {
2324         for(; len > 0; buf++, len--) {
2325                 char c = *buf;
2326
2327                 if(ISCONTROL((uchar) c)) { /* control code */
2328                         if(c & 0x80) {
2329                                 c &= 0x7f;
2330                                 tputc("^", 1);
2331                                 tputc("[", 1);
2332                         } else if(c != '\n' && c != '\r' && c != '\t') {
2333                                 c ^= 0x40;
2334                                 tputc("^", 1);
2335                         }
2336                         tputc(&c, 1);
2337                 } else {
2338                         break;
2339                 }
2340         }
2341         if(len)
2342                 tputc(buf, len);
2343 }
2344
2345 void
2346 tdeftran(char ascii) {
2347         static char cs[] = "0B";
2348         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2349         char *p;
2350
2351         if((p = strchr(cs, ascii)) == NULL) {
2352                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2353         } else {
2354                 term.trantbl[term.icharset] = vcs[p - cs];
2355         }
2356 }
2357
2358 void
2359 tdectest(char c) {
2360         static char E[UTF_SIZ] = "E";
2361         int x, y;
2362
2363         if(c == '8') { /* DEC screen alignment test. */
2364                 for(x = 0; x < term.col; ++x) {
2365                         for(y = 0; y < term.row; ++y)
2366                                 tsetchar(E, &term.c.attr, x, y);
2367                 }
2368         }
2369 }
2370
2371 void
2372 tstrsequence(uchar c) {
2373         if (c & 0x80) {
2374                 switch (c) {
2375                 case 0x90:   /* DCS -- Device Control String */
2376                         c = 'P';
2377                         break;
2378                 case 0x9f:   /* APC -- Application Program Command */
2379                         c = '_';
2380                         break;
2381                 case 0x9e:   /* PM -- Privacy Message */
2382                         c = '^';
2383                         break;
2384                 case 0x9d:   /* OSC -- Operating System Command */
2385                         c = ']';
2386                         break;
2387                 }
2388         }
2389         strreset();
2390         strescseq.type = c;
2391         term.esc |= ESC_STR;
2392         return;
2393 }
2394
2395 void
2396 tcontrolcode(uchar ascii) {
2397         static char question[UTF_SIZ] = "?";
2398
2399         switch(ascii) {
2400         case '\t':   /* HT */
2401                 tputtab(1);
2402                 return;
2403         case '\b':   /* BS */
2404                 tmoveto(term.c.x-1, term.c.y);
2405                 return;
2406         case '\r':   /* CR */
2407                 tmoveto(0, term.c.y);
2408                 return;
2409         case '\f':   /* LF */
2410         case '\v':   /* VT */
2411         case '\n':   /* LF */
2412                 /* go to first col if the mode is set */
2413                 tnewline(IS_SET(MODE_CRLF));
2414                 return;
2415         case '\a':   /* BEL */
2416                 if(term.esc & ESC_STR_END) {
2417                         /* backwards compatibility to xterm */
2418                         strhandle();
2419                 } else {
2420                         if(!(xw.state & WIN_FOCUSED))
2421                                 xseturgency(1);
2422                         if (bellvolume)
2423                                 XBell(xw.dpy, bellvolume);
2424                 }
2425                 break;
2426         case '\033': /* ESC */
2427                 csireset();
2428                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2429                 term.esc |= ESC_START;
2430                 return;
2431         case '\016': /* SO */
2432                 term.charset = 0;
2433                 return;
2434         case '\017': /* SI */
2435                 term.charset = 1;
2436                 return;
2437         case '\032': /* SUB */
2438                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2439         case '\030': /* CAN */
2440                 csireset();
2441                 break;
2442         case '\005': /* ENQ (IGNORED) */
2443         case '\000': /* NUL (IGNORED) */
2444         case '\021': /* XON (IGNORED) */
2445         case '\023': /* XOFF (IGNORED) */
2446         case 0177:   /* DEL (IGNORED) */
2447                 return;
2448         case 0x84:   /* TODO: IND */
2449                 break;
2450         case 0x85:   /* NEL -- Next line */
2451                 tnewline(1); /* always go to first col */
2452                 break;
2453         case 0x88:   /* HTS -- Horizontal tab stop */
2454                 term.tabs[term.c.x] = 1;
2455                 break;
2456         case 0x8d:   /* TODO: RI */
2457         case 0x8e:   /* TODO: SS2 */
2458         case 0x8f:   /* TODO: SS3 */
2459         case 0x98:   /* TODO: SOS */
2460                 break;
2461         case 0x9a:   /* DECID -- Identify Terminal */
2462                 ttywrite(vtiden, sizeof(vtiden) - 1);
2463                 break;
2464         case 0x9b:   /* TODO: CSI */
2465         case 0x9c:   /* TODO: ST */
2466                 break;
2467         case 0x90:   /* DCS -- Device Control String */
2468         case 0x9f:   /* APC -- Application Program Command */
2469         case 0x9e:   /* PM -- Privacy Message */
2470         case 0x9d:   /* OSC -- Operating System Command */
2471                 tstrsequence(ascii);
2472                 return;
2473         }
2474         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2475         term.esc &= ~(ESC_STR_END|ESC_STR);
2476         return;
2477 }
2478
2479 /*
2480  * returns 1 when the sequence is finished and it hasn't to read
2481  * more characters for this sequence, otherwise 0
2482  */
2483 int
2484 eschandle(uchar ascii) {
2485         switch(ascii) {
2486         case '[':
2487                 term.esc |= ESC_CSI;
2488                 return 0;
2489         case '#':
2490                 term.esc |= ESC_TEST;
2491                 return 0;
2492         case 'P': /* DCS -- Device Control String */
2493         case '_': /* APC -- Application Program Command */
2494         case '^': /* PM -- Privacy Message */
2495         case ']': /* OSC -- Operating System Command */
2496         case 'k': /* old title set compatibility */
2497                 tstrsequence(ascii);
2498                 return 0;
2499         case '(': /* GZD4 -- set primary charset G0 */
2500         case ')': /* G1D4 -- set secondary charset G1 */
2501         case '*': /* G2D4 -- set tertiary charset G2 */
2502         case '+': /* G3D4 -- set quaternary charset G3 */
2503                 term.icharset = ascii - '(';
2504                 term.esc |= ESC_ALTCHARSET;
2505                 return 0;
2506         case 'D': /* IND -- Linefeed */
2507                 if(term.c.y == term.bot) {
2508                         tscrollup(term.top, 1);
2509                 } else {
2510                         tmoveto(term.c.x, term.c.y+1);
2511                 }
2512                 break;
2513         case 'E': /* NEL -- Next line */
2514                 tnewline(1); /* always go to first col */
2515                 break;
2516         case 'H': /* HTS -- Horizontal tab stop */
2517                 term.tabs[term.c.x] = 1;
2518                 break;
2519         case 'M': /* RI -- Reverse index */
2520                 if(term.c.y == term.top) {
2521                         tscrolldown(term.top, 1);
2522                 } else {
2523                         tmoveto(term.c.x, term.c.y-1);
2524                 }
2525                 break;
2526         case 'Z': /* DECID -- Identify Terminal */
2527                 ttywrite(vtiden, sizeof(vtiden) - 1);
2528                 break;
2529         case 'c': /* RIS -- Reset to inital state */
2530                 treset();
2531                 xresettitle();
2532                 xloadcols();
2533                 break;
2534         case '=': /* DECPAM -- Application keypad */
2535                 term.mode |= MODE_APPKEYPAD;
2536                 break;
2537         case '>': /* DECPNM -- Normal keypad */
2538                 term.mode &= ~MODE_APPKEYPAD;
2539                 break;
2540         case '7': /* DECSC -- Save Cursor */
2541                 tcursor(CURSOR_SAVE);
2542                 break;
2543         case '8': /* DECRC -- Restore Cursor */
2544                 tcursor(CURSOR_LOAD);
2545                 break;
2546         case '\\': /* ST -- String Terminator */
2547                 if(term.esc & ESC_STR_END)
2548                         strhandle();
2549                 break;
2550         default:
2551                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2552                         (uchar) ascii, isprint(ascii)? ascii:'.');
2553                 break;
2554         }
2555         return 1;
2556 }
2557
2558 void
2559 tputc(char *c, int len) {
2560         uchar ascii;
2561         bool control;
2562         long unicodep;
2563         int width;
2564         Glyph *gp;
2565
2566         if(len == 1) {
2567                 width = 1;
2568                 unicodep = ascii = *c;
2569         } else {
2570                 utf8decode(c, &unicodep, UTF_SIZ);
2571                 width = wcwidth(unicodep);
2572                 control = ISCONTROLC1(unicodep);
2573                 ascii = unicodep;
2574         }
2575
2576         if(IS_SET(MODE_PRINT))
2577                 tprinter(c, len);
2578         control = ISCONTROL(unicodep);
2579
2580         /*
2581          * STR sequence must be checked before anything else
2582          * because it uses all following characters until it
2583          * receives a ESC, a SUB, a ST or any other C1 control
2584          * character.
2585          */
2586         if(term.esc & ESC_STR) {
2587                 if(width == 1 &&
2588                    (ascii == '\a' || ascii == 030 ||
2589                     ascii == 032  || ascii == 033 ||
2590                     ISCONTROLC1(unicodep))) {
2591                         term.esc &= ~(ESC_START|ESC_STR);
2592                         term.esc |= ESC_STR_END;
2593                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2594                         memmove(&strescseq.buf[strescseq.len], c, len);
2595                         strescseq.len += len;
2596                         return;
2597                 } else {
2598                 /*
2599                  * Here is a bug in terminals. If the user never sends
2600                  * some code to stop the str or esc command, then st
2601                  * will stop responding. But this is better than
2602                  * silently failing with unknown characters. At least
2603                  * then users will report back.
2604                  *
2605                  * In the case users ever get fixed, here is the code:
2606                  */
2607                 /*
2608                  * term.esc = 0;
2609                  * strhandle();
2610                  */
2611                         return;
2612                 }
2613         }
2614
2615         /*
2616          * Actions of control codes must be performed as soon they arrive
2617          * because they can be embedded inside a control sequence, and
2618          * they must not cause conflicts with sequences.
2619          */
2620         if(control) {
2621                 tcontrolcode(ascii);
2622                 /*
2623                  * control codes are not shown ever
2624                  */
2625                 return;
2626         } else if(term.esc & ESC_START) {
2627                 if(term.esc & ESC_CSI) {
2628                         csiescseq.buf[csiescseq.len++] = ascii;
2629                         if(BETWEEN(ascii, 0x40, 0x7E)
2630                                         || csiescseq.len >= \
2631                                         sizeof(csiescseq.buf)-1) {
2632                                 term.esc = 0;
2633                                 csiparse();
2634                                 csihandle();
2635                         }
2636                         return;
2637                 } else if(term.esc & ESC_ALTCHARSET) {
2638                         tdeftran(ascii);
2639                 } else if(term.esc & ESC_TEST) {
2640                         tdectest(ascii);
2641                 } else {
2642                         if (!eschandle(ascii))
2643                                 return;
2644                         /* sequence already finished */
2645                 }
2646                 term.esc = 0;
2647                 /*
2648                  * All characters which form part of a sequence are not
2649                  * printed
2650                  */
2651                 return;
2652         }
2653         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2654                 selclear(NULL);
2655
2656         gp = &term.line[term.c.y][term.c.x];
2657         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2658                 gp->mode |= ATTR_WRAP;
2659                 tnewline(1);
2660         }
2661
2662         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2663                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2664
2665         if(term.c.x+width > term.col)
2666                 tnewline(1);
2667
2668         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2669
2670         if(width == 2) {
2671                 gp->mode |= ATTR_WIDE;
2672                 if(term.c.x+1 < term.col) {
2673                         gp[1].c[0] = '\0';
2674                         gp[1].mode = ATTR_WDUMMY;
2675                 }
2676         }
2677         if(term.c.x+width < term.col) {
2678                 tmoveto(term.c.x+width, term.c.y);
2679         } else {
2680                 term.c.state |= CURSOR_WRAPNEXT;
2681         }
2682 }
2683
2684 void
2685 tresize(int col, int row) {
2686         int i;
2687         int minrow = MIN(row, term.row);
2688         int mincol = MIN(col, term.col);
2689         int slide = term.c.y - row + 1;
2690         bool *bp;
2691         TCursor c;
2692
2693         if(col < 1 || row < 1) {
2694                 fprintf(stderr,
2695                         "tresize: error resizing to %dx%d\n", col, row);
2696                 return;
2697         }
2698
2699         /* free unneeded rows */
2700         i = 0;
2701         if(slide > 0) {
2702                 /*
2703                  * slide screen to keep cursor where we expect it -
2704                  * tscrollup would work here, but we can optimize to
2705                  * memmove because we're freeing the earlier lines
2706                  */
2707                 for(/* i = 0 */; i < slide; i++) {
2708                         free(term.line[i]);
2709                         free(term.alt[i]);
2710                 }
2711                 memmove(term.line, term.line + slide, row * sizeof(Line));
2712                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2713         }
2714         for(i += row; i < term.row; i++) {
2715                 free(term.line[i]);
2716                 free(term.alt[i]);
2717         }
2718
2719         /* resize to new height */
2720         term.line = xrealloc(term.line, row * sizeof(Line));
2721         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2722         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2723         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2724
2725         /* resize each row to new width, zero-pad if needed */
2726         for(i = 0; i < minrow; i++) {
2727                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2728                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2729         }
2730
2731         /* allocate any new rows */
2732         for(/* i == minrow */; i < row; i++) {
2733                 term.line[i] = xmalloc(col * sizeof(Glyph));
2734                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2735         }
2736         if(col > term.col) {
2737                 bp = term.tabs + term.col;
2738
2739                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2740                 while(--bp > term.tabs && !*bp)
2741                         /* nothing */ ;
2742                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2743                         *bp = 1;
2744         }
2745         /* update terminal size */
2746         term.col = col;
2747         term.row = row;
2748         /* reset scrolling region */
2749         tsetscroll(0, row-1);
2750         /* make use of the LIMIT in tmoveto */
2751         tmoveto(term.c.x, term.c.y);
2752         /* Clearing both screens (it makes dirty all lines) */
2753         c = term.c;
2754         for(i = 0; i < 2; i++) {
2755                 if(mincol < col && 0 < minrow) {
2756                         tclearregion(mincol, 0, col - 1, minrow - 1);
2757                 }
2758                 if(0 < col && minrow < row) {
2759                         tclearregion(0, minrow, col - 1, row - 1);
2760                 }
2761                 tswapscreen();
2762                 tcursor(CURSOR_LOAD);
2763         }
2764         term.c = c;
2765 }
2766
2767 void
2768 xresize(int col, int row) {
2769         xw.tw = MAX(1, col * xw.cw);
2770         xw.th = MAX(1, row * xw.ch);
2771
2772         XFreePixmap(xw.dpy, xw.buf);
2773         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2774                         DefaultDepth(xw.dpy, xw.scr));
2775         XftDrawChange(xw.draw, xw.buf);
2776         xclear(0, 0, xw.w, xw.h);
2777 }
2778
2779 static inline ushort
2780 sixd_to_16bit(int x) {
2781         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2782 }
2783
2784 void
2785 xloadcols(void) {
2786         int i;
2787         XRenderColor color = { .alpha = 0xffff };
2788         static bool loaded;
2789         Color *cp;
2790
2791         if(loaded) {
2792                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2793                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2794         }
2795
2796         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2797         for(i = 0; i < LEN(colorname); i++) {
2798                 if(!colorname[i])
2799                         continue;
2800                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2801                         die("Could not allocate color '%s'\n", colorname[i]);
2802                 }
2803         }
2804
2805         /* load colors [16-231] ; same colors as xterm */
2806         for(i = 16; i < 6*6*6+16; i++) {
2807                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2808                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2809                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2810                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2811                         die("Could not allocate color %d\n", i);
2812         }
2813
2814         /* load colors [232-255] ; grayscale */
2815         for(; i < 256; i++) {
2816                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2817                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2818                         die("Could not allocate color %d\n", i);
2819         }
2820         loaded = true;
2821 }
2822
2823 int
2824 xsetcolorname(int x, const char *name) {
2825         XRenderColor color = { .alpha = 0xffff };
2826         Color ncolor;
2827
2828         if(!BETWEEN(x, 0, LEN(colorname)))
2829                 return 1;
2830
2831         if(!name) {
2832                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2833                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2834                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2835                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2836                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2837                                                 xw.cmap, &color, &ncolor)) {
2838                                 return 1;
2839                         }
2840
2841                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2842                         dc.col[x] = ncolor;
2843                         return 0;
2844                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2845                         color.red = color.green = color.blue = \
2846                                     0x0808 + 0x0a0a * (x - (16 + 216));
2847                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2848                                                 xw.cmap, &color, &ncolor)) {
2849                                 return 1;
2850                         }
2851
2852                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2853                         dc.col[x] = ncolor;
2854                         return 0;
2855                 } else { /* system colors */
2856                         name = colorname[x];
2857                 }
2858         }
2859         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2860                 return 1;
2861
2862         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2863         dc.col[x] = ncolor;
2864         return 0;
2865 }
2866
2867 void
2868 xtermclear(int col1, int row1, int col2, int row2) {
2869         XftDrawRect(xw.draw,
2870                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2871                         borderpx + col1 * xw.cw,
2872                         borderpx + row1 * xw.ch,
2873                         (col2-col1+1) * xw.cw,
2874                         (row2-row1+1) * xw.ch);
2875 }
2876
2877 /*
2878  * Absolute coordinates.
2879  */
2880 void
2881 xclear(int x1, int y1, int x2, int y2) {
2882         XftDrawRect(xw.draw,
2883                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2884                         x1, y1, x2-x1, y2-y1);
2885 }
2886
2887 void
2888 xhints(void) {
2889         XClassHint class = {opt_class ? opt_class : termname, termname};
2890         XWMHints wm = {.flags = InputHint, .input = 1};
2891         XSizeHints *sizeh = NULL;
2892
2893         sizeh = XAllocSizeHints();
2894
2895         sizeh->flags = PSize | PResizeInc | PBaseSize;
2896         sizeh->height = xw.h;
2897         sizeh->width = xw.w;
2898         sizeh->height_inc = xw.ch;
2899         sizeh->width_inc = xw.cw;
2900         sizeh->base_height = 2 * borderpx;
2901         sizeh->base_width = 2 * borderpx;
2902         if(xw.isfixed == True) {
2903                 sizeh->flags |= PMaxSize | PMinSize;
2904                 sizeh->min_width = sizeh->max_width = xw.w;
2905                 sizeh->min_height = sizeh->max_height = xw.h;
2906         }
2907         if(xw.gm & (XValue|YValue)) {
2908                 sizeh->flags |= USPosition | PWinGravity;
2909                 sizeh->x = xw.l;
2910                 sizeh->y = xw.t;
2911                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2912         }
2913
2914         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2915                         &class);
2916         XFree(sizeh);
2917 }
2918
2919 int
2920 xgeommasktogravity(int mask) {
2921         switch(mask & (XNegative|YNegative)) {
2922         case 0:
2923                 return NorthWestGravity;
2924         case XNegative:
2925                 return NorthEastGravity;
2926         case YNegative:
2927                 return SouthWestGravity;
2928         }
2929         return SouthEastGravity;
2930 }
2931
2932 int
2933 xloadfont(Font *f, FcPattern *pattern) {
2934         FcPattern *match;
2935         FcResult result;
2936
2937         match = FcFontMatch(NULL, pattern, &result);
2938         if(!match)
2939                 return 1;
2940
2941         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2942                 FcPatternDestroy(match);
2943                 return 1;
2944         }
2945
2946         f->set = NULL;
2947         f->pattern = FcPatternDuplicate(pattern);
2948
2949         f->ascent = f->match->ascent;
2950         f->descent = f->match->descent;
2951         f->lbearing = 0;
2952         f->rbearing = f->match->max_advance_width;
2953
2954         f->height = f->ascent + f->descent;
2955         f->width = f->lbearing + f->rbearing;
2956
2957         return 0;
2958 }
2959
2960 void
2961 xloadfonts(char *fontstr, double fontsize) {
2962         FcPattern *pattern;
2963         FcResult r_sz, r_psz;
2964         double fontval;
2965         float ceilf(float);
2966
2967         if(fontstr[0] == '-') {
2968                 pattern = XftXlfdParse(fontstr, False, False);
2969         } else {
2970                 pattern = FcNameParse((FcChar8 *)fontstr);
2971         }
2972
2973         if(!pattern)
2974                 die("st: can't open font %s\n", fontstr);
2975
2976         if(fontsize > 0) {
2977                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2978                 FcPatternDel(pattern, FC_SIZE);
2979                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2980                 usedfontsize = fontsize;
2981         } else {
2982                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2983                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2984                 if(r_psz == FcResultMatch) {
2985                         usedfontsize = fontval;
2986                 } else if(r_sz == FcResultMatch) {
2987                         usedfontsize = -1;
2988                 } else {
2989                         /*
2990                          * Default font size is 12, if none given. This is to
2991                          * have a known usedfontsize value.
2992                          */
2993                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2994                         usedfontsize = 12;
2995                 }
2996         }
2997
2998         FcConfigSubstitute(0, pattern, FcMatchPattern);
2999         FcDefaultSubstitute(pattern);
3000
3001         if(xloadfont(&dc.font, pattern))
3002                 die("st: can't open font %s\n", fontstr);
3003
3004         if(usedfontsize < 0) {
3005                 FcPatternGetDouble(dc.font.match->pattern,
3006                                    FC_PIXEL_SIZE, 0, &fontval);
3007                 usedfontsize = fontval;
3008         }
3009
3010         /* Setting character width and height. */
3011         xw.cw = ceilf(dc.font.width * cwscale);
3012         xw.ch = ceilf(dc.font.height * chscale);
3013
3014         FcPatternDel(pattern, FC_SLANT);
3015         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3016         if(xloadfont(&dc.ifont, pattern))
3017                 die("st: can't open font %s\n", fontstr);
3018
3019         FcPatternDel(pattern, FC_WEIGHT);
3020         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3021         if(xloadfont(&dc.ibfont, pattern))
3022                 die("st: can't open font %s\n", fontstr);
3023
3024         FcPatternDel(pattern, FC_SLANT);
3025         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3026         if(xloadfont(&dc.bfont, pattern))
3027                 die("st: can't open font %s\n", fontstr);
3028
3029         FcPatternDestroy(pattern);
3030 }
3031
3032 int
3033 xloadfontset(Font *f) {
3034         FcResult result;
3035
3036         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3037                 return 1;
3038         return 0;
3039 }
3040
3041 void
3042 xunloadfont(Font *f) {
3043         XftFontClose(xw.dpy, f->match);
3044         FcPatternDestroy(f->pattern);
3045         if(f->set)
3046                 FcFontSetDestroy(f->set);
3047 }
3048
3049 void
3050 xunloadfonts(void) {
3051         /* Free the loaded fonts in the font cache.  */
3052         while(frclen > 0)
3053                 XftFontClose(xw.dpy, frc[--frclen].font);
3054
3055         xunloadfont(&dc.font);
3056         xunloadfont(&dc.bfont);
3057         xunloadfont(&dc.ifont);
3058         xunloadfont(&dc.ibfont);
3059 }
3060
3061 void
3062 xzoom(const Arg *arg) {
3063         xunloadfonts();
3064         xloadfonts(usedfont, usedfontsize + arg->i);
3065         cresize(0, 0);
3066         redraw(0);
3067         xhints();
3068 }
3069
3070 void
3071 xinit(void) {
3072         XGCValues gcvalues;
3073         Cursor cursor;
3074         Window parent;
3075         pid_t thispid = getpid();
3076
3077         if(!(xw.dpy = XOpenDisplay(NULL)))
3078                 die("Can't open display\n");
3079         xw.scr = XDefaultScreen(xw.dpy);
3080         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3081
3082         /* font */
3083         if(!FcInit())
3084                 die("Could not init fontconfig.\n");
3085
3086         usedfont = (opt_font == NULL)? font : opt_font;
3087         xloadfonts(usedfont, 0);
3088
3089         /* colors */
3090         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3091         xloadcols();
3092
3093         /* adjust fixed window geometry */
3094         xw.w = 2 * borderpx + term.col * xw.cw;
3095         xw.h = 2 * borderpx + term.row * xw.ch;
3096         if(xw.gm & XNegative)
3097                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3098         if(xw.gm & YNegative)
3099                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3100
3101         /* Events */
3102         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3103         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3104         xw.attrs.bit_gravity = NorthWestGravity;
3105         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3106                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3107                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3108         xw.attrs.colormap = xw.cmap;
3109
3110         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3111                         XRootWindow(xw.dpy, xw.scr);
3112         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3113                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3114                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3115                         | CWEventMask | CWColormap, &xw.attrs);
3116
3117         memset(&gcvalues, 0, sizeof(gcvalues));
3118         gcvalues.graphics_exposures = False;
3119         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3120                         &gcvalues);
3121         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3122                         DefaultDepth(xw.dpy, xw.scr));
3123         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3124         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3125
3126         /* Xft rendering context */
3127         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3128
3129         /* input methods */
3130         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3131                 XSetLocaleModifiers("@im=local");
3132                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3133                         XSetLocaleModifiers("@im=");
3134                         if((xw.xim = XOpenIM(xw.dpy,
3135                                         NULL, NULL, NULL)) == NULL) {
3136                                 die("XOpenIM failed. Could not open input"
3137                                         " device.\n");
3138                         }
3139                 }
3140         }
3141         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3142                                            | XIMStatusNothing, XNClientWindow, xw.win,
3143                                            XNFocusWindow, xw.win, NULL);
3144         if(xw.xic == NULL)
3145                 die("XCreateIC failed. Could not obtain input method.\n");
3146
3147         /* white cursor, black outline */
3148         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3149         XDefineCursor(xw.dpy, xw.win, cursor);
3150         XRecolorCursor(xw.dpy, cursor,
3151                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3152                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3153
3154         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3155         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3156         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3157         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3158
3159         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3160         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3161                         PropModeReplace, (uchar *)&thispid, 1);
3162
3163         xresettitle();
3164         XMapWindow(xw.dpy, xw.win);
3165         xhints();
3166         XSync(xw.dpy, False);
3167 }
3168
3169 void
3170 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3171         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3172             width = charlen * xw.cw, xp, i;
3173         int frcflags;
3174         int u8fl, u8fblen, u8cblen, doesexist;
3175         char *u8c, *u8fs;
3176         long unicodep;
3177         Font *font = &dc.font;
3178         FcResult fcres;
3179         FcPattern *fcpattern, *fontpattern;
3180         FcFontSet *fcsets[] = { NULL };
3181         FcCharSet *fccharset;
3182         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3183         XRenderColor colfg, colbg;
3184         XRectangle r;
3185         int oneatatime;
3186
3187         frcflags = FRC_NORMAL;
3188
3189         if(base.mode & ATTR_ITALIC) {
3190                 if(base.fg == defaultfg)
3191                         base.fg = defaultitalic;
3192                 font = &dc.ifont;
3193                 frcflags = FRC_ITALIC;
3194         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3195                 if(base.fg == defaultfg)
3196                         base.fg = defaultitalic;
3197                 font = &dc.ibfont;
3198                 frcflags = FRC_ITALICBOLD;
3199         } else if(base.mode & ATTR_UNDERLINE) {
3200                 if(base.fg == defaultfg)
3201                         base.fg = defaultunderline;
3202         }
3203
3204         if(IS_TRUECOL(base.fg)) {
3205                 colfg.alpha = 0xffff;
3206                 colfg.red = TRUERED(base.fg);
3207                 colfg.green = TRUEGREEN(base.fg);
3208                 colfg.blue = TRUEBLUE(base.fg);
3209                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3210                 fg = &truefg;
3211         } else {
3212                 fg = &dc.col[base.fg];
3213         }
3214
3215         if(IS_TRUECOL(base.bg)) {
3216                 colbg.alpha = 0xffff;
3217                 colbg.green = TRUEGREEN(base.bg);
3218                 colbg.red = TRUERED(base.bg);
3219                 colbg.blue = TRUEBLUE(base.bg);
3220                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3221                 bg = &truebg;
3222         } else {
3223                 bg = &dc.col[base.bg];
3224         }
3225
3226         if(base.mode & ATTR_BOLD) {
3227                 /*
3228                  * change basic system colors [0-7]
3229                  * to bright system colors [8-15]
3230                  */
3231                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3232                         fg = &dc.col[base.fg + 8];
3233
3234                 if(base.mode & ATTR_ITALIC) {
3235                         font = &dc.ibfont;
3236                         frcflags = FRC_ITALICBOLD;
3237                 } else {
3238                         font = &dc.bfont;
3239                         frcflags = FRC_BOLD;
3240                 }
3241         }
3242
3243         if(IS_SET(MODE_REVERSE)) {
3244                 if(fg == &dc.col[defaultfg]) {
3245                         fg = &dc.col[defaultbg];
3246                 } else {
3247                         colfg.red = ~fg->color.red;
3248                         colfg.green = ~fg->color.green;
3249                         colfg.blue = ~fg->color.blue;
3250                         colfg.alpha = fg->color.alpha;
3251                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3252                                         &revfg);
3253                         fg = &revfg;
3254                 }
3255
3256                 if(bg == &dc.col[defaultbg]) {
3257                         bg = &dc.col[defaultfg];
3258                 } else {
3259                         colbg.red = ~bg->color.red;
3260                         colbg.green = ~bg->color.green;
3261                         colbg.blue = ~bg->color.blue;
3262                         colbg.alpha = bg->color.alpha;
3263                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3264                                         &revbg);
3265                         bg = &revbg;
3266                 }
3267         }
3268
3269         if(base.mode & ATTR_REVERSE) {
3270                 temp = fg;
3271                 fg = bg;
3272                 bg = temp;
3273         }
3274
3275         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3276                 colfg.red = fg->color.red / 2;
3277                 colfg.green = fg->color.green / 2;
3278                 colfg.blue = fg->color.blue / 2;
3279                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3280                 fg = &revfg;
3281         }
3282
3283         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3284                 fg = bg;
3285
3286         if(base.mode & ATTR_INVISIBLE)
3287                 fg = bg;
3288
3289         /* Intelligent cleaning up of the borders. */
3290         if(x == 0) {
3291                 xclear(0, (y == 0)? 0 : winy, borderpx,
3292                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3293         }
3294         if(x + charlen >= term.col) {
3295                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3296                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3297         }
3298         if(y == 0)
3299                 xclear(winx, 0, winx + width, borderpx);
3300         if(y == term.row-1)
3301                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3302
3303         /* Clean up the region we want to draw to. */
3304         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3305
3306         /* Set the clip region because Xft is sometimes dirty. */
3307         r.x = 0;
3308         r.y = 0;
3309         r.height = xw.ch;
3310         r.width = width;
3311         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3312
3313         for(xp = winx; bytelen > 0;) {
3314                 /*
3315                  * Search for the range in the to be printed string of glyphs
3316                  * that are in the main font. Then print that range. If
3317                  * some glyph is found that is not in the font, do the
3318                  * fallback dance.
3319                  */
3320                 u8fs = s;
3321                 u8fblen = 0;
3322                 u8fl = 0;
3323                 oneatatime = font->width != xw.cw;
3324                 for(;;) {
3325                         u8c = s;
3326                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3327                         s += u8cblen;
3328                         bytelen -= u8cblen;
3329
3330                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3331                         if(doesexist) {
3332                                         u8fl++;
3333                                         u8fblen += u8cblen;
3334                                         if(!oneatatime && bytelen > 0)
3335                                                         continue;
3336                         }
3337
3338                         if(u8fl > 0) {
3339                                 XftDrawStringUtf8(xw.draw, fg,
3340                                                 font->match, xp,
3341                                                 winy + font->ascent,
3342                                                 (FcChar8 *)u8fs,
3343                                                 u8fblen);
3344                                 xp += xw.cw * u8fl;
3345                         }
3346                         break;
3347                 }
3348                 if(doesexist) {
3349                         if(oneatatime)
3350                                 continue;
3351                         break;
3352                 }
3353
3354                 /* Search the font cache. */
3355                 for(i = 0; i < frclen; i++) {
3356                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3357                                         && frc[i].flags == frcflags) {
3358                                 break;
3359                         }
3360                 }
3361
3362                 /* Nothing was found. */
3363                 if(i >= frclen) {
3364                         if(!font->set)
3365                                 xloadfontset(font);
3366                         fcsets[0] = font->set;
3367
3368                         /*
3369                          * Nothing was found in the cache. Now use
3370                          * some dozen of Fontconfig calls to get the
3371                          * font for one single character.
3372                          *
3373                          * Xft and fontconfig are design failures.
3374                          */
3375                         fcpattern = FcPatternDuplicate(font->pattern);
3376                         fccharset = FcCharSetCreate();
3377
3378                         FcCharSetAddChar(fccharset, unicodep);
3379                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3380                                         fccharset);
3381                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3382                                         FcTrue);
3383
3384                         FcConfigSubstitute(0, fcpattern,
3385                                         FcMatchPattern);
3386                         FcDefaultSubstitute(fcpattern);
3387
3388                         fontpattern = FcFontSetMatch(0, fcsets,
3389                                         FcTrue, fcpattern, &fcres);
3390
3391                         /*
3392                          * Overwrite or create the new cache entry.
3393                          */
3394                         if(frclen >= LEN(frc)) {
3395                                 frclen = LEN(frc) - 1;
3396                                 XftFontClose(xw.dpy, frc[frclen].font);
3397                         }
3398
3399                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3400                                         fontpattern);
3401                         frc[frclen].flags = frcflags;
3402
3403                         i = frclen;
3404                         frclen++;
3405
3406                         FcPatternDestroy(fcpattern);
3407                         FcCharSetDestroy(fccharset);
3408                 }
3409
3410                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3411                                 xp, winy + frc[i].font->ascent,
3412                                 (FcChar8 *)u8c, u8cblen);
3413
3414                 xp += xw.cw * wcwidth(unicodep);
3415         }
3416
3417         /*
3418          * This is how the loop above actually should be. Why does the
3419          * application have to care about font details?
3420          *
3421          * I have to repeat: Xft and Fontconfig are design failures.
3422          */
3423         /*
3424         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3425                         winy + font->ascent, (FcChar8 *)s, bytelen);
3426         */
3427
3428         if(base.mode & ATTR_UNDERLINE) {
3429                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3430                                 width, 1);
3431         }
3432
3433         if(base.mode & ATTR_STRUCK) {
3434                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3435                                 width, 1);
3436         }
3437
3438         /* Reset clip to none. */
3439         XftDrawSetClip(xw.draw, 0);
3440 }
3441
3442 void
3443 xdrawcursor(void) {
3444         static int oldx = 0, oldy = 0;
3445         int sl, width, curx;
3446         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3447
3448         LIMIT(oldx, 0, term.col-1);
3449         LIMIT(oldy, 0, term.row-1);
3450
3451         curx = term.c.x;
3452
3453         /* adjust position if in dummy */
3454         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3455                 oldx--;
3456         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3457                 curx--;
3458
3459         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3460
3461         /* remove the old cursor */
3462         sl = utf8len(term.line[oldy][oldx].c);
3463         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3464         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3465                         oldy, width, sl);
3466
3467         if(IS_SET(MODE_HIDE))
3468                 return;
3469
3470         /* draw the new one */
3471         if(xw.state & WIN_FOCUSED) {
3472                 if(IS_SET(MODE_REVERSE)) {
3473                         g.mode |= ATTR_REVERSE;
3474                         g.fg = defaultcs;
3475                         g.bg = defaultfg;
3476                 }
3477
3478                 sl = utf8len(g.c);
3479                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3480                         ? 2 : 1;
3481                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3482         } else {
3483                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3484                                 borderpx + curx * xw.cw,
3485                                 borderpx + term.c.y * xw.ch,
3486                                 xw.cw - 1, 1);
3487                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3488                                 borderpx + curx * xw.cw,
3489                                 borderpx + term.c.y * xw.ch,
3490                                 1, xw.ch - 1);
3491                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3492                                 borderpx + (curx + 1) * xw.cw - 1,
3493                                 borderpx + term.c.y * xw.ch,
3494                                 1, xw.ch - 1);
3495                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3496                                 borderpx + curx * xw.cw,
3497                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3498                                 xw.cw, 1);
3499         }
3500         oldx = curx, oldy = term.c.y;
3501 }
3502
3503
3504 void
3505 xsettitle(char *p) {
3506         XTextProperty prop;
3507
3508         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3509                         &prop);
3510         XSetWMName(xw.dpy, xw.win, &prop);
3511         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3512         XFree(prop.value);
3513 }
3514
3515 void
3516 xresettitle(void) {
3517         xsettitle(opt_title ? opt_title : "st");
3518 }
3519
3520 void
3521 redraw(int timeout) {
3522         struct timespec tv = {0, timeout * 1000};
3523
3524         tfulldirt();
3525         draw();
3526
3527         if(timeout > 0) {
3528                 nanosleep(&tv, NULL);
3529                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3530         }
3531 }
3532
3533 void
3534 draw(void) {
3535         drawregion(0, 0, term.col, term.row);
3536         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3537                         xw.h, 0, 0);
3538         XSetForeground(xw.dpy, dc.gc,
3539                         dc.col[IS_SET(MODE_REVERSE)?
3540                                 defaultfg : defaultbg].pixel);
3541 }
3542
3543 void
3544 drawregion(int x1, int y1, int x2, int y2) {
3545         int ic, ib, x, y, ox, sl;
3546         Glyph base, new;
3547         char buf[DRAW_BUF_SIZ];
3548         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3549         long unicodep;
3550
3551         if(!(xw.state & WIN_VISIBLE))
3552                 return;
3553
3554         for(y = y1; y < y2; y++) {
3555                 if(!term.dirty[y])
3556                         continue;
3557
3558                 xtermclear(0, y, term.col, y);
3559                 term.dirty[y] = 0;
3560                 base = term.line[y][0];
3561                 ic = ib = ox = 0;
3562                 for(x = x1; x < x2; x++) {
3563                         new = term.line[y][x];
3564                         if(new.mode == ATTR_WDUMMY)
3565                                 continue;
3566                         if(ena_sel && selected(x, y))
3567                                 new.mode ^= ATTR_REVERSE;
3568                         if(ib > 0 && (ATTRCMP(base, new)
3569                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3570                                 xdraws(buf, base, ox, y, ic, ib);
3571                                 ic = ib = 0;
3572                         }
3573                         if(ib == 0) {
3574                                 ox = x;
3575                                 base = new;
3576                         }
3577
3578                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3579                         memcpy(buf+ib, new.c, sl);
3580                         ib += sl;
3581                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3582                 }
3583                 if(ib > 0)
3584                         xdraws(buf, base, ox, y, ic, ib);
3585         }
3586         xdrawcursor();
3587 }
3588
3589 void
3590 expose(XEvent *ev) {
3591         XExposeEvent *e = &ev->xexpose;
3592
3593         if(xw.state & WIN_REDRAW) {
3594                 if(!e->count)
3595                         xw.state &= ~WIN_REDRAW;
3596         }
3597         redraw(0);
3598 }
3599
3600 void
3601 visibility(XEvent *ev) {
3602         XVisibilityEvent *e = &ev->xvisibility;
3603
3604         if(e->state == VisibilityFullyObscured) {
3605                 xw.state &= ~WIN_VISIBLE;
3606         } else if(!(xw.state & WIN_VISIBLE)) {
3607                 /* need a full redraw for next Expose, not just a buf copy */
3608                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3609         }
3610 }
3611
3612 void
3613 unmap(XEvent *ev) {
3614         xw.state &= ~WIN_VISIBLE;
3615 }
3616
3617 void
3618 xsetpointermotion(int set) {
3619         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3620         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3621 }
3622
3623 void
3624 xseturgency(int add) {
3625         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3626
3627         MODBIT(h->flags, add, XUrgencyHint);
3628         XSetWMHints(xw.dpy, xw.win, h);
3629         XFree(h);
3630 }
3631
3632 void
3633 focus(XEvent *ev) {
3634         XFocusChangeEvent *e = &ev->xfocus;
3635
3636         if(e->mode == NotifyGrab)
3637                 return;
3638
3639         if(ev->type == FocusIn) {
3640                 XSetICFocus(xw.xic);
3641                 xw.state |= WIN_FOCUSED;
3642                 xseturgency(0);
3643                 if(IS_SET(MODE_FOCUS))
3644                         ttywrite("\033[I", 3);
3645         } else {
3646                 XUnsetICFocus(xw.xic);
3647                 xw.state &= ~WIN_FOCUSED;
3648                 if(IS_SET(MODE_FOCUS))
3649                         ttywrite("\033[O", 3);
3650         }
3651 }
3652
3653 static inline bool
3654 match(uint mask, uint state) {
3655         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3656 }
3657
3658 void
3659 numlock(const Arg *dummy) {
3660         term.numlock ^= 1;
3661 }
3662
3663 char*
3664 kmap(KeySym k, uint state) {
3665         Key *kp;
3666         int i;
3667
3668         /* Check for mapped keys out of X11 function keys. */
3669         for(i = 0; i < LEN(mappedkeys); i++) {
3670                 if(mappedkeys[i] == k)
3671                         break;
3672         }
3673         if(i == LEN(mappedkeys)) {
3674                 if((k & 0xFFFF) < 0xFD00)
3675                         return NULL;
3676         }
3677
3678         for(kp = key; kp < key + LEN(key); kp++) {
3679                 if(kp->k != k)
3680                         continue;
3681
3682                 if(!match(kp->mask, state))
3683                         continue;
3684
3685                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3686                         continue;
3687                 if(term.numlock && kp->appkey == 2)
3688                         continue;
3689
3690                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3691                         continue;
3692
3693                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3694                         continue;
3695
3696                 return kp->s;
3697         }
3698
3699         return NULL;
3700 }
3701
3702 void
3703 kpress(XEvent *ev) {
3704         XKeyEvent *e = &ev->xkey;
3705         KeySym ksym;
3706         char buf[32], *customkey;
3707         int len;
3708         long c;
3709         Status status;
3710         Shortcut *bp;
3711
3712         if(IS_SET(MODE_KBDLOCK))
3713                 return;
3714
3715         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3716         /* 1. shortcuts */
3717         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3718                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3719                         bp->func(&(bp->arg));
3720                         return;
3721                 }
3722         }
3723
3724         /* 2. custom keys from config.h */
3725         if((customkey = kmap(ksym, e->state))) {
3726                 ttysend(customkey, strlen(customkey));
3727                 return;
3728         }
3729
3730         /* 3. composed string from input method */
3731         if(len == 0)
3732                 return;
3733         if(len == 1 && e->state & Mod1Mask) {
3734                 if(IS_SET(MODE_8BIT)) {
3735                         if(*buf < 0177) {
3736                                 c = *buf | 0x80;
3737                                 len = utf8encode(c, buf, UTF_SIZ);
3738                         }
3739                 } else {
3740                         buf[1] = buf[0];
3741                         buf[0] = '\033';
3742                         len = 2;
3743                 }
3744         }
3745         ttysend(buf, len);
3746 }
3747
3748
3749 void
3750 cmessage(XEvent *e) {
3751         /*
3752          * See xembed specs
3753          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3754          */
3755         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3756                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3757                         xw.state |= WIN_FOCUSED;
3758                         xseturgency(0);
3759                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3760                         xw.state &= ~WIN_FOCUSED;
3761                 }
3762         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3763                 /* Send SIGHUP to shell */
3764                 kill(pid, SIGHUP);
3765                 exit(EXIT_SUCCESS);
3766         }
3767 }
3768
3769 void
3770 cresize(int width, int height) {
3771         int col, row;
3772
3773         if(width != 0)
3774                 xw.w = width;
3775         if(height != 0)
3776                 xw.h = height;
3777
3778         col = (xw.w - 2 * borderpx) / xw.cw;
3779         row = (xw.h - 2 * borderpx) / xw.ch;
3780
3781         tresize(col, row);
3782         xresize(col, row);
3783         ttyresize();
3784 }
3785
3786 void
3787 resize(XEvent *e) {
3788         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3789                 return;
3790
3791         cresize(e->xconfigure.width, e->xconfigure.height);
3792 }
3793
3794 void
3795 run(void) {
3796         XEvent ev;
3797         int w = xw.w, h = xw.h;
3798         fd_set rfd;
3799         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3800         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3801         long deltatime;
3802
3803         /* Waiting for window mapping */
3804         while(1) {
3805                 XNextEvent(xw.dpy, &ev);
3806                 if(XFilterEvent(&ev, None))
3807                         continue;
3808                 if(ev.type == ConfigureNotify) {
3809                         w = ev.xconfigure.width;
3810                         h = ev.xconfigure.height;
3811                 } else if(ev.type == MapNotify) {
3812                         break;
3813                 }
3814         }
3815
3816         ttynew();
3817         cresize(w, h);
3818
3819         clock_gettime(CLOCK_MONOTONIC, &last);
3820         lastblink = last;
3821
3822         for(xev = actionfps;;) {
3823                 FD_ZERO(&rfd);
3824                 FD_SET(cmdfd, &rfd);
3825                 FD_SET(xfd, &rfd);
3826
3827                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3828                         if(errno == EINTR)
3829                                 continue;
3830                         die("select failed: %s\n", strerror(errno));
3831                 }
3832                 if(FD_ISSET(cmdfd, &rfd)) {
3833                         ttyread();
3834                         if(blinktimeout) {
3835                                 blinkset = tattrset(ATTR_BLINK);
3836                                 if(!blinkset)
3837                                         MODBIT(term.mode, 0, MODE_BLINK);
3838                         }
3839                 }
3840
3841                 if(FD_ISSET(xfd, &rfd))
3842                         xev = actionfps;
3843
3844                 clock_gettime(CLOCK_MONOTONIC, &now);
3845                 drawtimeout.tv_sec = 0;
3846                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3847                 tv = &drawtimeout;
3848
3849                 dodraw = 0;
3850                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3851                         tsetdirtattr(ATTR_BLINK);
3852                         term.mode ^= MODE_BLINK;
3853                         lastblink = now;
3854                         dodraw = 1;
3855                 }
3856                 deltatime = TIMEDIFF(now, last);
3857                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3858                                 || deltatime < 0) {
3859                         dodraw = 1;
3860                         last = now;
3861                 }
3862
3863                 if(dodraw) {
3864                         while(XPending(xw.dpy)) {
3865                                 XNextEvent(xw.dpy, &ev);
3866                                 if(XFilterEvent(&ev, None))
3867                                         continue;
3868                                 if(handler[ev.type])
3869                                         (handler[ev.type])(&ev);
3870                         }
3871
3872                         draw();
3873                         XFlush(xw.dpy);
3874
3875                         if(xev && !FD_ISSET(xfd, &rfd))
3876                                 xev--;
3877                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3878                                 if(blinkset) {
3879                                         if(TIMEDIFF(now, lastblink) \
3880                                                         > blinktimeout) {
3881                                                 drawtimeout.tv_nsec = 1000;
3882                                         } else {
3883                                                 drawtimeout.tv_nsec = (1E6 * \
3884                                                         (blinktimeout - \
3885                                                         TIMEDIFF(now,
3886                                                                 lastblink)));
3887                                         }
3888                                 } else {
3889                                         tv = NULL;
3890                                 }
3891                         }
3892                 }
3893         }
3894 }
3895
3896 void
3897 usage(void) {
3898         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3899         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3900         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3901 }
3902
3903 int
3904 main(int argc, char *argv[]) {
3905         char *titles;
3906         uint cols = 80, rows = 24;
3907
3908         xw.l = xw.t = 0;
3909         xw.isfixed = False;
3910
3911         ARGBEGIN {
3912         case 'a':
3913                 allowaltscreen = false;
3914                 break;
3915         case 'c':
3916                 opt_class = EARGF(usage());
3917                 break;
3918         case 'e':
3919                 /* eat all remaining arguments */
3920                 if(argc > 1) {
3921                         opt_cmd = &argv[1];
3922                         if(argv[1] != NULL && opt_title == NULL) {
3923                                 titles = xstrdup(argv[1]);
3924                                 opt_title = basename(titles);
3925                         }
3926                 }
3927                 goto run;
3928         case 'f':
3929                 opt_font = EARGF(usage());
3930                 break;
3931         case 'g':
3932                 xw.gm = XParseGeometry(EARGF(usage()),
3933                                 &xw.l, &xw.t, &cols, &rows);
3934                 break;
3935         case 'i':
3936                 xw.isfixed = True;
3937                 break;
3938         case 'o':
3939                 opt_io = EARGF(usage());
3940                 break;
3941         case 't':
3942                 opt_title = EARGF(usage());
3943                 break;
3944         case 'w':
3945                 opt_embed = EARGF(usage());
3946                 break;
3947         case 'v':
3948         default:
3949                 usage();
3950         } ARGEND;
3951
3952 run:
3953         setlocale(LC_CTYPE, "");
3954         XSetLocaleModifiers("");
3955         tnew(cols? cols : 1, rows? rows : 1);
3956         xinit();
3957         selinit();
3958         run();
3959
3960         return 0;
3961 }
3962