st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <X11/XKBlib.h>
  31 #include <fontconfig/fontconfig.h>
  32 #include <wchar.h>
  33
  34 #include "arg.h"
  35
  36 char *argv0;
  37
  38 #define Glyph Glyph_
  39 #define Font Font_
  40
  41 #if   defined(__linux)
  42  #include <pty.h>
  43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  44  #include <util.h>
  45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  46  #include <libutil.h>
  47 #endif
  48
  49
  50 /* XEMBED messages */
  51 #define XEMBED_FOCUS_IN  4
  52 #define XEMBED_FOCUS_OUT 5
  53
  54 /* Arbitrary sizes */
  55 #define UTF_INVALID   0xFFFD
  56 #define UTF_SIZ       4
  57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  58 #define ESC_ARG_SIZ   16
  59 #define STR_BUF_SIZ   ESC_BUF_SIZ
  60 #define STR_ARG_SIZ   ESC_ARG_SIZ
  61 #define DRAW_BUF_SIZ  20*1024
  62 #define XK_ANY_MOD    UINT_MAX
  63 #define XK_NO_MOD     0
  64 #define XK_SWITCH_MOD (1<<13)
  65
  66 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  67
  68 /* macros */
  69 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  70 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  71 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  72 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  73 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  74 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  75 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  76 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  77 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  78 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  79 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  80 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  81 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  82
  83 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  84 #define IS_TRUECOL(x)    (1 << 24 & (x))
  85 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  86 #define TRUEGREEN(x)     (((x) & 0xff00))
  87 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  88
  89
  90 enum glyph_attribute {
  91         ATTR_NULL      = 0,
  92         ATTR_BOLD      = 1 << 0,
  93         ATTR_FAINT     = 1 << 1,
  94         ATTR_ITALIC    = 1 << 2,
  95         ATTR_UNDERLINE = 1 << 3,
  96         ATTR_BLINK     = 1 << 4,
  97         ATTR_REVERSE   = 1 << 5,
  98         ATTR_INVISIBLE = 1 << 6,
  99         ATTR_STRUCK    = 1 << 7,
 100         ATTR_WRAP      = 1 << 8,
 101         ATTR_WIDE      = 1 << 9,
 102         ATTR_WDUMMY    = 1 << 10,
 103 };
 104
 105 enum cursor_movement {
 106         CURSOR_SAVE,
 107         CURSOR_LOAD
 108 };
 109
 110 enum cursor_state {
 111         CURSOR_DEFAULT  = 0,
 112         CURSOR_WRAPNEXT = 1,
 113         CURSOR_ORIGIN   = 2
 114 };
 115
 116 enum term_mode {
 117         MODE_WRAP        = 1 << 0,
 118         MODE_INSERT      = 1 << 1,
 119         MODE_APPKEYPAD   = 1 << 2,
 120         MODE_ALTSCREEN   = 1 << 3,
 121         MODE_CRLF        = 1 << 4,
 122         MODE_MOUSEBTN    = 1 << 5,
 123         MODE_MOUSEMOTION = 1 << 6,
 124         MODE_REVERSE     = 1 << 7,
 125         MODE_KBDLOCK     = 1 << 8,
 126         MODE_HIDE        = 1 << 9,
 127         MODE_ECHO        = 1 << 10,
 128         MODE_APPCURSOR   = 1 << 11,
 129         MODE_MOUSESGR    = 1 << 12,
 130         MODE_8BIT        = 1 << 13,
 131         MODE_BLINK       = 1 << 14,
 132         MODE_FBLINK      = 1 << 15,
 133         MODE_FOCUS       = 1 << 16,
 134         MODE_MOUSEX10    = 1 << 17,
 135         MODE_MOUSEMANY   = 1 << 18,
 136         MODE_BRCKTPASTE  = 1 << 19,
 137         MODE_PRINT       = 1 << 20,
 138         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 139                           |MODE_MOUSEMANY,
 140 };
 141
 142 enum charset {
 143         CS_GRAPHIC0,
 144         CS_GRAPHIC1,
 145         CS_UK,
 146         CS_USA,
 147         CS_MULTI,
 148         CS_GER,
 149         CS_FIN
 150 };
 151
 152 enum escape_state {
 153         ESC_START      = 1,
 154         ESC_CSI        = 2,
 155         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 156         ESC_ALTCHARSET = 8,
 157         ESC_STR_END    = 16, /* a final string was encountered */
 158         ESC_TEST       = 32, /* Enter in test mode */
 159 };
 160
 161 enum window_state {
 162         WIN_VISIBLE = 1,
 163         WIN_REDRAW  = 2,
 164         WIN_FOCUSED = 4
 165 };
 166
 167 enum selection_type {
 168         SEL_REGULAR = 1,
 169         SEL_RECTANGULAR = 2
 170 };
 171
 172 enum selection_snap {
 173         SNAP_WORD = 1,
 174         SNAP_LINE = 2
 175 };
 176
 177 typedef unsigned char uchar;
 178 typedef unsigned int uint;
 179 typedef unsigned long ulong;
 180 typedef unsigned short ushort;
 181
 182 typedef XftDraw *Draw;
 183 typedef XftColor Color;
 184
 185 typedef struct {
 186         char c[UTF_SIZ]; /* character code */
 187         ushort mode;      /* attribute flags */
 188         uint32_t fg;      /* foreground  */
 189         uint32_t bg;      /* background  */
 190 } Glyph;
 191
 192 typedef Glyph *Line;
 193
 194 typedef struct {
 195         Glyph attr; /* current char attributes */
 196         int x;
 197         int y;
 198         char state;
 199 } TCursor;
 200
 201 /* CSI Escape sequence structs */
 202 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 203 typedef struct {
 204         char buf[ESC_BUF_SIZ]; /* raw string */
 205         int len;               /* raw string length */
 206         char priv;
 207         int arg[ESC_ARG_SIZ];
 208         int narg;              /* nb of args */
 209         char mode;
 210 } CSIEscape;
 211
 212 /* STR Escape sequence structs */
 213 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 214 typedef struct {
 215         char type;             /* ESC type ... */
 216         char buf[STR_BUF_SIZ]; /* raw string */
 217         int len;               /* raw string length */
 218         char *args[STR_ARG_SIZ];
 219         int narg;              /* nb of args */
 220 } STREscape;
 221
 222 /* Internal representation of the screen */
 223 typedef struct {
 224         int row;      /* nb row */
 225         int col;      /* nb col */
 226         Line *line;   /* screen */
 227         Line *alt;    /* alternate screen */
 228         bool *dirty;  /* dirtyness of lines */
 229         TCursor c;    /* cursor */
 230         int top;      /* top    scroll limit */
 231         int bot;      /* bottom scroll limit */
 232         int mode;     /* terminal mode flags */
 233         int esc;      /* escape state flags */
 234         char trantbl[4]; /* charset table translation */
 235         int charset;  /* current charset */
 236         int icharset; /* selected charset for sequence */
 237         bool numlock; /* lock numbers in keyboard */
 238         bool *tabs;
 239 } Term;
 240
 241 /* Purely graphic info */
 242 typedef struct {
 243         Display *dpy;
 244         Colormap cmap;
 245         Window win;
 246         Drawable buf;
 247         Atom xembed, wmdeletewin, netwmname, netwmpid;
 248         XIM xim;
 249         XIC xic;
 250         Draw draw;
 251         Visual *vis;
 252         XSetWindowAttributes attrs;
 253         int scr;
 254         bool isfixed; /* is fixed geometry? */
 255         int l, t; /* left and top offset */
 256         int gm; /* geometry mask */
 257         int tw, th; /* tty width and height */
 258         int w, h; /* window width and height */
 259         int ch; /* char height */
 260         int cw; /* char width  */
 261         char state; /* focus, redraw, visible */
 262 } XWindow;
 263
 264 typedef struct {
 265         uint b;
 266         uint mask;
 267         char *s;
 268 } Mousekey;
 269
 270 typedef struct {
 271         KeySym k;
 272         uint mask;
 273         char *s;
 274         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 275         signed char appkey;    /* application keypad */
 276         signed char appcursor; /* application cursor */
 277         signed char crlf;      /* crlf mode          */
 278 } Key;
 279
 280 typedef struct {
 281         int mode;
 282         int type;
 283         int snap;
 284         /*
 285          * Selection variables:
 286          * nb – normalized coordinates of the beginning of the selection
 287          * ne – normalized coordinates of the end of the selection
 288          * ob – original coordinates of the beginning of the selection
 289          * oe – original coordinates of the end of the selection
 290          */
 291         struct {
 292                 int x, y;
 293         } nb, ne, ob, oe;
 294
 295         char *clip;
 296         Atom xtarget;
 297         bool alt;
 298         struct timespec tclick1;
 299         struct timespec tclick2;
 300 } Selection;
 301
 302 typedef union {
 303         int i;
 304         uint ui;
 305         float f;
 306         const void *v;
 307 } Arg;
 308
 309 typedef struct {
 310         uint mod;
 311         KeySym keysym;
 312         void (*func)(const Arg *);
 313         const Arg arg;
 314 } Shortcut;
 315
 316 /* function definitions used in config.h */
 317 static void clippaste(const Arg *);
 318 static void numlock(const Arg *);
 319 static void selpaste(const Arg *);
 320 static void xzoom(const Arg *);
 321 static void xzoomabs(const Arg *);
 322 static void xzoomreset(const Arg *);
 323 static void printsel(const Arg *);
 324 static void printscreen(const Arg *) ;
 325 static void toggleprinter(const Arg *);
 326
 327 /* Config.h for applying patches and the configuration. */
 328 #include "config.h"
 329
 330 /* Font structure */
 331 typedef struct {
 332         int height;
 333         int width;
 334         int ascent;
 335         int descent;
 336         short lbearing;
 337         short rbearing;
 338         XftFont *match;
 339         FcFontSet *set;
 340         FcPattern *pattern;
 341 } Font;
 342
 343 /* Drawing Context */
 344 typedef struct {
 345         Color col[MAX(LEN(colorname), 256)];
 346         Font font, bfont, ifont, ibfont;
 347         GC gc;
 348 } DC;
 349
 350 static void die(const char *, ...);
 351 static void draw(void);
 352 static void redraw(int);
 353 static void drawregion(int, int, int, int);
 354 static void execsh(void);
 355 static void sigchld(int);
 356 static void run(void);
 357
 358 static void csidump(void);
 359 static void csihandle(void);
 360 static void csiparse(void);
 361 static void csireset(void);
 362 static int eschandle(uchar ascii);
 363 static void strdump(void);
 364 static void strhandle(void);
 365 static void strparse(void);
 366 static void strreset(void);
 367
 368 static int tattrset(int);
 369 static void tprinter(char *, size_t);
 370 static void tdumpsel(void);
 371 static void tdumpline(int);
 372 static void tdump(void);
 373 static void tclearregion(int, int, int, int);
 374 static void tcursor(int);
 375 static void tdeletechar(int);
 376 static void tdeleteline(int);
 377 static void tinsertblank(int);
 378 static void tinsertblankline(int);
 379 static int tlinelen(int);
 380 static void tmoveto(int, int);
 381 static void tmoveato(int, int);
 382 static void tnew(int, int);
 383 static void tnewline(int);
 384 static void tputtab(int);
 385 static void tputc(char *, int);
 386 static void treset(void);
 387 static void tresize(int, int);
 388 static void tscrollup(int, int);
 389 static void tscrolldown(int, int);
 390 static void tsetattr(int *, int);
 391 static void tsetchar(char *, Glyph *, int, int);
 392 static void tsetscroll(int, int);
 393 static void tswapscreen(void);
 394 static void tsetdirt(int, int);
 395 static void tsetdirtattr(int);
 396 static void tsetmode(bool, bool, int *, int);
 397 static void tfulldirt(void);
 398 static void techo(char *, int);
 399 static void tcontrolcode(uchar );
 400 static void tdectest(char );
 401 static int32_t tdefcolor(int *, int *, int);
 402 static void tdeftran(char);
 403 static inline bool match(uint, uint);
 404 static void ttynew(void);
 405 static void ttyread(void);
 406 static void ttyresize(void);
 407 static void ttysend(char *, size_t);
 408 static void ttywrite(const char *, size_t);
 409 static void tstrsequence(uchar c);
 410
 411 static void xdraws(char *, Glyph, int, int, int, int);
 412 static void xhints(void);
 413 static void xclear(int, int, int, int);
 414 static void xdrawcursor(void);
 415 static void xinit(void);
 416 static void xloadcols(void);
 417 static int xsetcolorname(int, const char *);
 418 static int xgeommasktogravity(int);
 419 static int xloadfont(Font *, FcPattern *);
 420 static void xloadfonts(char *, double);
 421 static int xloadfontset(Font *);
 422 static void xsettitle(char *);
 423 static void xresettitle(void);
 424 static void xsetpointermotion(int);
 425 static void xseturgency(int);
 426 static void xsetsel(char *);
 427 static void xtermclear(int, int, int, int);
 428 static void xunloadfont(Font *);
 429 static void xunloadfonts(void);
 430 static void xresize(int, int);
 431
 432 static void expose(XEvent *);
 433 static void visibility(XEvent *);
 434 static void unmap(XEvent *);
 435 static char *kmap(KeySym, uint);
 436 static void kpress(XEvent *);
 437 static void cmessage(XEvent *);
 438 static void cresize(int, int);
 439 static void resize(XEvent *);
 440 static void focus(XEvent *);
 441 static void brelease(XEvent *);
 442 static void bpress(XEvent *);
 443 static void bmotion(XEvent *);
 444 static void selnotify(XEvent *);
 445 static void selclear(XEvent *);
 446 static void selrequest(XEvent *);
 447
 448 static void selinit(void);
 449 static void selnormalize(void);
 450 static inline bool selected(int, int);
 451 static char *getsel(void);
 452 static void selcopy(void);
 453 static void selscroll(int, int);
 454 static void selsnap(int, int *, int *, int);
 455 static void getbuttoninfo(XEvent *);
 456 static void mousereport(XEvent *);
 457
 458 static size_t utf8decode(char *, long *, size_t);
 459 static long utf8decodebyte(char, size_t *);
 460 static size_t utf8encode(long, char *, size_t);
 461 static char utf8encodebyte(long, size_t);
 462 static size_t utf8len(char *);
 463 static size_t utf8validate(long *, size_t);
 464
 465 static ssize_t xwrite(int, const char *, size_t);
 466 static void *xmalloc(size_t);
 467 static void *xrealloc(void *, size_t);
 468 static char *xstrdup(char *);
 469
 470 static void usage(void);
 471
 472 static void (*handler[LASTEvent])(XEvent *) = {
 473         [KeyPress] = kpress,
 474         [ClientMessage] = cmessage,
 475         [ConfigureNotify] = resize,
 476         [VisibilityNotify] = visibility,
 477         [UnmapNotify] = unmap,
 478         [Expose] = expose,
 479         [FocusIn] = focus,
 480         [FocusOut] = focus,
 481         [MotionNotify] = bmotion,
 482         [ButtonPress] = bpress,
 483         [ButtonRelease] = brelease,
 484         [SelectionClear] = selclear,
 485         [SelectionNotify] = selnotify,
 486         [SelectionRequest] = selrequest,
 487 };
 488
 489 /* Globals */
 490 static DC dc;
 491 static XWindow xw;
 492 static Term term;
 493 static CSIEscape csiescseq;
 494 static STREscape strescseq;
 495 static int cmdfd;
 496 static pid_t pid;
 497 static Selection sel;
 498 static int iofd = STDOUT_FILENO;
 499 static char **opt_cmd = NULL;
 500 static char *opt_io = NULL;
 501 static char *opt_title = NULL;
 502 static char *opt_embed = NULL;
 503 static char *opt_class = NULL;
 504 static char *opt_font = NULL;
 505 static int oldbutton = 3; /* button event on startup: 3 = release */
 506
 507 static char *usedfont = NULL;
 508 static double usedfontsize = 0;
 509 static double defaultfontsize = 0;
 510
 511 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 512 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 513 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 514 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 515
 516 /* Font Ring Cache */
 517 enum {
 518         FRC_NORMAL,
 519         FRC_ITALIC,
 520         FRC_BOLD,
 521         FRC_ITALICBOLD
 522 };
 523
 524 typedef struct {
 525         XftFont *font;
 526         int flags;
 527 } Fontcache;
 528
 529 /* Fontcache is an array now. A new font will be appended to the array. */
 530 static Fontcache frc[16];
 531 static int frclen = 0;
 532
 533 ssize_t
 534 xwrite(int fd, const char *s, size_t len) {
 535         size_t aux = len;
 536
 537         while(len > 0) {
 538                 ssize_t r = write(fd, s, len);
 539                 if(r < 0)
 540                         return r;
 541                 len -= r;
 542                 s += r;
 543         }
 544         return aux;
 545 }
 546
 547 void *
 548 xmalloc(size_t len) {
 549         void *p = malloc(len);
 550
 551         if(!p)
 552                 die("Out of memory\n");
 553
 554         return p;
 555 }
 556
 557 void *
 558 xrealloc(void *p, size_t len) {
 559         if((p = realloc(p, len)) == NULL)
 560                 die("Out of memory\n");
 561
 562         return p;
 563 }
 564
 565 char *
 566 xstrdup(char *s) {
 567         if((s = strdup(s)) == NULL)
 568                 die("Out of memory\n");
 569
 570         return s;
 571 }
 572
 573 size_t
 574 utf8decode(char *c, long *u, size_t clen) {
 575         size_t i, j, len, type;
 576         long udecoded;
 577
 578         *u = UTF_INVALID;
 579         if(!clen)
 580                 return 0;
 581         udecoded = utf8decodebyte(c[0], &len);
 582         if(!BETWEEN(len, 1, UTF_SIZ))
 583                 return 1;
 584         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 585                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 586                 if(type != 0)
 587                         return j;
 588         }
 589         if(j < len)
 590                 return 0;
 591         *u = udecoded;
 592         utf8validate(u, len);
 593         return len;
 594 }
 595
 596 long
 597 utf8decodebyte(char c, size_t *i) {
 598         for(*i = 0; *i < LEN(utfmask); ++(*i))
 599                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 600                         return (uchar)c & ~utfmask[*i];
 601         return 0;
 602 }
 603
 604 size_t
 605 utf8encode(long u, char *c, size_t clen) {
 606         size_t len, i;
 607
 608         len = utf8validate(&u, 0);
 609         if(clen < len)
 610                 return 0;
 611         for(i = len - 1; i != 0; --i) {
 612                 c[i] = utf8encodebyte(u, 0);
 613                 u >>= 6;
 614         }
 615         c[0] = utf8encodebyte(u, len);
 616         return len;
 617 }
 618
 619 char
 620 utf8encodebyte(long u, size_t i) {
 621         return utfbyte[i] | (u & ~utfmask[i]);
 622 }
 623
 624 size_t
 625 utf8len(char *c) {
 626         return utf8decode(c, &(long){0}, UTF_SIZ);
 627 }
 628
 629 size_t
 630 utf8validate(long *u, size_t i) {
 631         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 632                 *u = UTF_INVALID;
 633         for(i = 1; *u > utfmax[i]; ++i)
 634                 ;
 635         return i;
 636 }
 637
 638 static void
 639 selinit(void) {
 640         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 641         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 642         sel.mode = 0;
 643         sel.ob.x = -1;
 644         sel.clip = NULL;
 645         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 646         if(sel.xtarget == None)
 647                 sel.xtarget = XA_STRING;
 648 }
 649
 650 static int
 651 x2col(int x) {
 652         x -= borderpx;
 653         x /= xw.cw;
 654
 655         return LIMIT(x, 0, term.col-1);
 656 }
 657
 658 static int
 659 y2row(int y) {
 660         y -= borderpx;
 661         y /= xw.ch;
 662
 663         return LIMIT(y, 0, term.row-1);
 664 }
 665
 666 static int tlinelen(int y) {
 667         int i = term.col;
 668
 669         if(term.line[y][i - 1].mode & ATTR_WRAP)
 670                 return i;
 671
 672         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
 673                 --i;
 674
 675         return i;
 676 }
 677
 678 static void
 679 selnormalize(void) {
 680         int i;
 681
 682         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 683                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 684                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 685         } else {
 686                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 687                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 688         }
 689         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 690         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 691
 692         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
 693         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
 694
 695         /* expand selection over line breaks */
 696         if (sel.type == SEL_RECTANGULAR)
 697                 return;
 698         i = tlinelen(sel.nb.y);
 699         if (i < sel.nb.x)
 700                 sel.nb.x = i;
 701         if (tlinelen(sel.ne.y) <= sel.ne.x)
 702                 sel.ne.x = term.col - 1;
 703 }
 704
 705 static inline bool
 706 selected(int x, int y) {
 707         if(sel.type == SEL_RECTANGULAR)
 708                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 709                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 710
 711         return BETWEEN(y, sel.nb.y, sel.ne.y)
 712             && (y != sel.nb.y || x >= sel.nb.x)
 713             && (y != sel.ne.y || x <= sel.ne.x);
 714 }
 715
 716 void
 717 selsnap(int mode, int *x, int *y, int direction) {
 718         int newx, newy, xt, yt;
 719         bool delim, prevdelim;
 720         Glyph *gp, *prevgp;
 721
 722         switch(mode) {
 723         case SNAP_WORD:
 724                 /*
 725                  * Snap around if the word wraps around at the end or
 726                  * beginning of a line.
 727                  */
 728                 prevgp = &term.line[*y][*x];
 729                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
 730                 for(;;) {
 731                         newx = *x + direction;
 732                         newy = *y;
 733                         if(!BETWEEN(newx, 0, term.col - 1)) {
 734                                 newy += direction;
 735                                 newx = (newx + term.col) % term.col;
 736                                 if (!BETWEEN(newy, 0, term.row - 1))
 737                                         break;
 738
 739                                 if(direction > 0)
 740                                         yt = *y, xt = *x;
 741                                 else
 742                                         yt = newy, xt = newx;
 743                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 744                                         break;
 745                         }
 746
 747                         if (newx >= tlinelen(newy))
 748                                 break;
 749
 750                         gp = &term.line[newy][newx];
 751                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
 752                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 753                                         || (delim && gp->c[0] != prevgp->c[0])))
 754                                 break;
 755
 756                         *x = newx;
 757                         *y = newy;
 758                         prevgp = gp;
 759                         prevdelim = delim;
 760                 }
 761                 break;
 762         case SNAP_LINE:
 763                 /*
 764                  * Snap around if the the previous line or the current one
 765                  * has set ATTR_WRAP at its end. Then the whole next or
 766                  * previous line will be selected.
 767                  */
 768                 *x = (direction < 0) ? 0 : term.col - 1;
 769                 if(direction < 0 && *y > 0) {
 770                         for(; *y > 0; *y += direction) {
 771                                 if(!(term.line[*y-1][term.col-1].mode
 772                                                 & ATTR_WRAP)) {
 773                                         break;
 774                                 }
 775                         }
 776                 } else if(direction > 0 && *y < term.row-1) {
 777                         for(; *y < term.row; *y += direction) {
 778                                 if(!(term.line[*y][term.col-1].mode
 779                                                 & ATTR_WRAP)) {
 780                                         break;
 781                                 }
 782                         }
 783                 }
 784                 break;
 785         }
 786 }
 787
 788 void
 789 getbuttoninfo(XEvent *e) {
 790         int type;
 791         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 792
 793         sel.alt = IS_SET(MODE_ALTSCREEN);
 794
 795         sel.oe.x = x2col(e->xbutton.x);
 796         sel.oe.y = y2row(e->xbutton.y);
 797         selnormalize();
 798
 799         sel.type = SEL_REGULAR;
 800         for(type = 1; type < LEN(selmasks); ++type) {
 801                 if(match(selmasks[type], state)) {
 802                         sel.type = type;
 803                         break;
 804                 }
 805         }
 806 }
 807
 808 void
 809 mousereport(XEvent *e) {
 810         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 811             button = e->xbutton.button, state = e->xbutton.state,
 812             len;
 813         char buf[40];
 814         static int ox, oy;
 815
 816         /* from urxvt */
 817         if(e->xbutton.type == MotionNotify) {
 818                 if(x == ox && y == oy)
 819                         return;
 820                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 821                         return;
 822                 /* MOUSE_MOTION: no reporting if no button is pressed */
 823                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 824                         return;
 825
 826                 button = oldbutton + 32;
 827                 ox = x;
 828                 oy = y;
 829         } else {
 830                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 831                         button = 3;
 832                 } else {
 833                         button -= Button1;
 834                         if(button >= 3)
 835                                 button += 64 - 3;
 836                 }
 837                 if(e->xbutton.type == ButtonPress) {
 838                         oldbutton = button;
 839                         ox = x;
 840                         oy = y;
 841                 } else if(e->xbutton.type == ButtonRelease) {
 842                         oldbutton = 3;
 843                         /* MODE_MOUSEX10: no button release reporting */
 844                         if(IS_SET(MODE_MOUSEX10))
 845                                 return;
 846                         if (button == 64 || button == 65)
 847                                 return;
 848                 }
 849         }
 850
 851         if(!IS_SET(MODE_MOUSEX10)) {
 852                 button += (state & ShiftMask   ? 4  : 0)
 853                         + (state & Mod4Mask    ? 8  : 0)
 854                         + (state & ControlMask ? 16 : 0);
 855         }
 856
 857         len = 0;
 858         if(IS_SET(MODE_MOUSESGR)) {
 859                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 860                                 button, x+1, y+1,
 861                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 862         } else if(x < 223 && y < 223) {
 863                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 864                                 32+button, 32+x+1, 32+y+1);
 865         } else {
 866                 return;
 867         }
 868
 869         ttywrite(buf, len);
 870 }
 871
 872 void
 873 bpress(XEvent *e) {
 874         struct timespec now;
 875         Mousekey *mk;
 876
 877         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 878                 mousereport(e);
 879                 return;
 880         }
 881
 882         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 883                 if(e->xbutton.button == mk->b
 884                                 && match(mk->mask, e->xbutton.state)) {
 885                         ttysend(mk->s, strlen(mk->s));
 886                         return;
 887                 }
 888         }
 889
 890         if(e->xbutton.button == Button1) {
 891                 clock_gettime(CLOCK_MONOTONIC, &now);
 892
 893                 /* Clear previous selection, logically and visually. */
 894                 selclear(NULL);
 895                 sel.mode = 1;
 896                 sel.type = SEL_REGULAR;
 897                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 898                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 899
 900                 /*
 901                  * If the user clicks below predefined timeouts specific
 902                  * snapping behaviour is exposed.
 903                  */
 904                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 905                         sel.snap = SNAP_LINE;
 906                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 907                         sel.snap = SNAP_WORD;
 908                 } else {
 909                         sel.snap = 0;
 910                 }
 911                 selnormalize();
 912
 913                 /*
 914                  * Draw selection, unless it's regular and we don't want to
 915                  * make clicks visible
 916                  */
 917                 if(sel.snap != 0) {
 918                         sel.mode++;
 919                         tsetdirt(sel.nb.y, sel.ne.y);
 920                 }
 921                 sel.tclick2 = sel.tclick1;
 922                 sel.tclick1 = now;
 923         }
 924 }
 925
 926 char *
 927 getsel(void) {
 928         char *str, *ptr;
 929         int y, bufsize, size, lastx, linelen;
 930         Glyph *gp, *last;
 931
 932         if(sel.ob.x == -1)
 933                 return NULL;
 934
 935         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 936         ptr = str = xmalloc(bufsize);
 937
 938         /* append every set & selected glyph to the selection */
 939         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 940                 linelen = tlinelen(y);
 941
 942                 if(sel.type == SEL_RECTANGULAR) {
 943                         gp = &term.line[y][sel.nb.x];
 944                         lastx = sel.ne.x;
 945                 } else {
 946                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 947                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 948                 }
 949                 last = &term.line[y][MIN(lastx, linelen-1)];
 950
 951                 for( ; gp <= last; ++gp) {
 952                         if(gp->mode & ATTR_WDUMMY)
 953                                 continue;
 954
 955                         size = utf8len(gp->c);
 956                         memcpy(ptr, gp->c, size);
 957                         ptr += size;
 958                 }
 959
 960                 /*
 961                  * Copy and pasting of line endings is inconsistent
 962                  * in the inconsistent terminal and GUI world.
 963                  * The best solution seems like to produce '\n' when
 964                  * something is copied from st and convert '\n' to
 965                  * '\r', when something to be pasted is received by
 966                  * st.
 967                  * FIXME: Fix the computer world.
 968                  */
 969                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 970                         *ptr++ = '\n';
 971         }
 972         *ptr = 0;
 973         return str;
 974 }
 975
 976 void
 977 selcopy(void) {
 978         xsetsel(getsel());
 979 }
 980
 981 void
 982 selnotify(XEvent *e) {
 983         ulong nitems, ofs, rem;
 984         int format;
 985         uchar *data, *last, *repl;
 986         Atom type;
 987
 988         ofs = 0;
 989         do {
 990                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 991                                         False, AnyPropertyType, &type, &format,
 992                                         &nitems, &rem, &data)) {
 993                         fprintf(stderr, "Clipboard allocation failed\n");
 994                         return;
 995                 }
 996
 997                 /*
 998                  * As seen in getsel:
 999                  * Line endings are inconsistent in the terminal and GUI world
1000                  * copy and pasting. When receiving some selection data,
1001                  * replace all '\n' with '\r'.
1002                  * FIXME: Fix the computer world.
1003                  */
1004                 repl = data;
1005                 last = data + nitems * format / 8;
1006                 while((repl = memchr(repl, '\n', last - repl))) {
1007                         *repl++ = '\r';
1008                 }
1009
1010                 if(IS_SET(MODE_BRCKTPASTE))
1011                         ttywrite("\033[200~", 6);
1012                 ttysend((char *)data, nitems * format / 8);
1013                 if(IS_SET(MODE_BRCKTPASTE))
1014                         ttywrite("\033[201~", 6);
1015                 XFree(data);
1016                 /* number of 32-bit chunks returned */
1017                 ofs += nitems * format / 32;
1018         } while(rem > 0);
1019 }
1020
1021 void
1022 selpaste(const Arg *dummy) {
1023         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1024                         xw.win, CurrentTime);
1025 }
1026
1027 void
1028 clippaste(const Arg *dummy) {
1029         Atom clipboard;
1030
1031         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1032         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1033                         xw.win, CurrentTime);
1034 }
1035
1036 void
1037 selclear(XEvent *e) {
1038         if(sel.ob.x == -1)
1039                 return;
1040         sel.ob.x = -1;
1041         tsetdirt(sel.nb.y, sel.ne.y);
1042 }
1043
1044 void
1045 selrequest(XEvent *e) {
1046         XSelectionRequestEvent *xsre;
1047         XSelectionEvent xev;
1048         Atom xa_targets, string;
1049
1050         xsre = (XSelectionRequestEvent *) e;
1051         xev.type = SelectionNotify;
1052         xev.requestor = xsre->requestor;
1053         xev.selection = xsre->selection;
1054         xev.target = xsre->target;
1055         xev.time = xsre->time;
1056         /* reject */
1057         xev.property = None;
1058
1059         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1060         if(xsre->target == xa_targets) {
1061                 /* respond with the supported type */
1062                 string = sel.xtarget;
1063                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1064                                 XA_ATOM, 32, PropModeReplace,
1065                                 (uchar *) &string, 1);
1066                 xev.property = xsre->property;
1067         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1068                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1069                                 xsre->target, 8, PropModeReplace,
1070                                 (uchar *) sel.clip, strlen(sel.clip));
1071                 xev.property = xsre->property;
1072         }
1073
1074         /* all done, send a notification to the listener */
1075         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1076                 fprintf(stderr, "Error sending SelectionNotify event\n");
1077 }
1078
1079 void
1080 xsetsel(char *str) {
1081         /* register the selection for both the clipboard and the primary */
1082         Atom clipboard;
1083
1084         free(sel.clip);
1085         sel.clip = str;
1086
1087         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1088
1089         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1090         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1091 }
1092
1093 void
1094 brelease(XEvent *e) {
1095         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1096                 mousereport(e);
1097                 return;
1098         }
1099
1100         if(e->xbutton.button == Button2) {
1101                 selpaste(NULL);
1102         } else if(e->xbutton.button == Button1) {
1103                 if(sel.mode < 2) {
1104                         selclear(NULL);
1105                 } else {
1106                         getbuttoninfo(e);
1107                         selcopy();
1108                 }
1109                 sel.mode = 0;
1110                 tsetdirt(sel.nb.y, sel.ne.y);
1111         }
1112 }
1113
1114 void
1115 bmotion(XEvent *e) {
1116         int oldey, oldex, oldsby, oldsey;
1117
1118         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1119                 mousereport(e);
1120                 return;
1121         }
1122
1123         if(!sel.mode)
1124                 return;
1125
1126         sel.mode++;
1127         oldey = sel.oe.y;
1128         oldex = sel.oe.x;
1129         oldsby = sel.nb.y;
1130         oldsey = sel.ne.y;
1131         getbuttoninfo(e);
1132
1133         if(oldey != sel.oe.y || oldex != sel.oe.x)
1134                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1135 }
1136
1137 void
1138 die(const char *errstr, ...) {
1139         va_list ap;
1140
1141         va_start(ap, errstr);
1142         vfprintf(stderr, errstr, ap);
1143         va_end(ap);
1144         exit(EXIT_FAILURE);
1145 }
1146
1147 void
1148 execsh(void) {
1149         char **args, *sh;
1150         const struct passwd *pw;
1151         char buf[sizeof(long) * 8 + 1];
1152
1153         errno = 0;
1154         if((pw = getpwuid(getuid())) == NULL) {
1155                 if(errno)
1156                         die("getpwuid:%s\n", strerror(errno));
1157                 else
1158                         die("who are you?\n");
1159         }
1160
1161         if (utmp)
1162                 sh = utmp;
1163         else if (pw->pw_shell[0])
1164                 sh = pw->pw_shell;
1165         else
1166                 sh = shell;
1167         args = (opt_cmd) ? opt_cmd : (char *[]){sh, NULL};
1168         snprintf(buf, sizeof(buf), "%lu", xw.win);
1169
1170         unsetenv("COLUMNS");
1171         unsetenv("LINES");
1172         unsetenv("TERMCAP");
1173         setenv("LOGNAME", pw->pw_name, 1);
1174         setenv("USER", pw->pw_name, 1);
1175         setenv("SHELL", args[0], 1);
1176         setenv("HOME", pw->pw_dir, 1);
1177         setenv("TERM", termname, 1);
1178         setenv("WINDOWID", buf, 1);
1179
1180         signal(SIGCHLD, SIG_DFL);
1181         signal(SIGHUP, SIG_DFL);
1182         signal(SIGINT, SIG_DFL);
1183         signal(SIGQUIT, SIG_DFL);
1184         signal(SIGTERM, SIG_DFL);
1185         signal(SIGALRM, SIG_DFL);
1186
1187         execvp(args[0], args);
1188         exit(EXIT_FAILURE);
1189 }
1190
1191 void
1192 sigchld(int a) {
1193         int stat, ret;
1194
1195         if(waitpid(pid, &stat, 0) < 0)
1196                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1197
1198         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1199         if (ret != EXIT_SUCCESS)
1200                 die("child finished with error '%d'\n", stat);
1201         exit(EXIT_SUCCESS);
1202 }
1203
1204 void
1205 ttynew(void) {
1206         int m, s;
1207         struct winsize w = {term.row, term.col, 0, 0};
1208
1209         /* seems to work fine on linux, openbsd and freebsd */
1210         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1211                 die("openpty failed: %s\n", strerror(errno));
1212
1213         switch(pid = fork()) {
1214         case -1:
1215                 die("fork failed\n");
1216                 break;
1217         case 0:
1218                 setsid(); /* create a new process group */
1219                 dup2(s, STDIN_FILENO);
1220                 dup2(s, STDOUT_FILENO);
1221                 dup2(s, STDERR_FILENO);
1222                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1223                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1224                 close(s);
1225                 close(m);
1226                 execsh();
1227                 break;
1228         default:
1229                 close(s);
1230                 cmdfd = m;
1231                 signal(SIGCHLD, sigchld);
1232                 if(opt_io) {
1233                         term.mode |= MODE_PRINT;
1234                         iofd = (!strcmp(opt_io, "-")) ?
1235                                   STDOUT_FILENO :
1236                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1237                         if(iofd < 0) {
1238                                 fprintf(stderr, "Error opening %s:%s\n",
1239                                         opt_io, strerror(errno));
1240                         }
1241                 }
1242                 break;
1243         }
1244 }
1245
1246 void
1247 ttyread(void) {
1248         static char buf[BUFSIZ];
1249         static int buflen = 0;
1250         char *ptr;
1251         char s[UTF_SIZ];
1252         int charsize; /* size of utf8 char in bytes */
1253         long unicodep;
1254         int ret;
1255
1256         /* append read bytes to unprocessed bytes */
1257         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1258                 die("Couldn't read from shell: %s\n", strerror(errno));
1259
1260         /* process every complete utf8 char */
1261         buflen += ret;
1262         ptr = buf;
1263         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1264                 utf8encode(unicodep, s, UTF_SIZ);
1265                 tputc(s, charsize);
1266                 ptr += charsize;
1267                 buflen -= charsize;
1268         }
1269
1270         /* keep any uncomplete utf8 char for the next call */
1271         memmove(buf, ptr, buflen);
1272 }
1273
1274 void
1275 ttywrite(const char *s, size_t n) {
1276         if(xwrite(cmdfd, s, n) == -1)
1277                 die("write error on tty: %s\n", strerror(errno));
1278 }
1279
1280 void
1281 ttysend(char *s, size_t n) {
1282         ttywrite(s, n);
1283         if(IS_SET(MODE_ECHO))
1284                 techo(s, n);
1285 }
1286
1287 void
1288 ttyresize(void) {
1289         struct winsize w;
1290
1291         w.ws_row = term.row;
1292         w.ws_col = term.col;
1293         w.ws_xpixel = xw.tw;
1294         w.ws_ypixel = xw.th;
1295         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1296                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1297 }
1298
1299 int
1300 tattrset(int attr) {
1301         int i, j;
1302
1303         for(i = 0; i < term.row-1; i++) {
1304                 for(j = 0; j < term.col-1; j++) {
1305                         if(term.line[i][j].mode & attr)
1306                                 return 1;
1307                 }
1308         }
1309
1310         return 0;
1311 }
1312
1313 void
1314 tsetdirt(int top, int bot) {
1315         int i;
1316
1317         LIMIT(top, 0, term.row-1);
1318         LIMIT(bot, 0, term.row-1);
1319
1320         for(i = top; i <= bot; i++)
1321                 term.dirty[i] = 1;
1322 }
1323
1324 void
1325 tsetdirtattr(int attr) {
1326         int i, j;
1327
1328         for(i = 0; i < term.row-1; i++) {
1329                 for(j = 0; j < term.col-1; j++) {
1330                         if(term.line[i][j].mode & attr) {
1331                                 tsetdirt(i, i);
1332                                 break;
1333                         }
1334                 }
1335         }
1336 }
1337
1338 void
1339 tfulldirt(void) {
1340         tsetdirt(0, term.row-1);
1341 }
1342
1343 void
1344 tcursor(int mode) {
1345         static TCursor c[2];
1346         bool alt = IS_SET(MODE_ALTSCREEN);
1347
1348         if(mode == CURSOR_SAVE) {
1349                 c[alt] = term.c;
1350         } else if(mode == CURSOR_LOAD) {
1351                 term.c = c[alt];
1352                 tmoveto(c[alt].x, c[alt].y);
1353         }
1354 }
1355
1356 void
1357 treset(void) {
1358         uint i;
1359
1360         term.c = (TCursor){{
1361                 .mode = ATTR_NULL,
1362                 .fg = defaultfg,
1363                 .bg = defaultbg
1364         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1365
1366         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1367         for(i = tabspaces; i < term.col; i += tabspaces)
1368                 term.tabs[i] = 1;
1369         term.top = 0;
1370         term.bot = term.row - 1;
1371         term.mode = MODE_WRAP;
1372         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1373         term.charset = 0;
1374
1375         for(i = 0; i < 2; i++) {
1376                 tmoveto(0, 0);
1377                 tcursor(CURSOR_SAVE);
1378                 tclearregion(0, 0, term.col-1, term.row-1);
1379                 tswapscreen();
1380         }
1381 }
1382
1383 void
1384 tnew(int col, int row) {
1385         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1386         tresize(col, row);
1387         term.numlock = 1;
1388
1389         treset();
1390 }
1391
1392 void
1393 tswapscreen(void) {
1394         Line *tmp = term.line;
1395
1396         term.line = term.alt;
1397         term.alt = tmp;
1398         term.mode ^= MODE_ALTSCREEN;
1399         tfulldirt();
1400 }
1401
1402 void
1403 tscrolldown(int orig, int n) {
1404         int i;
1405         Line temp;
1406
1407         LIMIT(n, 0, term.bot-orig+1);
1408
1409         tsetdirt(orig, term.bot-n);
1410         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1411
1412         for(i = term.bot; i >= orig+n; i--) {
1413                 temp = term.line[i];
1414                 term.line[i] = term.line[i-n];
1415                 term.line[i-n] = temp;
1416         }
1417
1418         selscroll(orig, n);
1419 }
1420
1421 void
1422 tscrollup(int orig, int n) {
1423         int i;
1424         Line temp;
1425
1426         LIMIT(n, 0, term.bot-orig+1);
1427
1428         tclearregion(0, orig, term.col-1, orig+n-1);
1429         tsetdirt(orig+n, term.bot);
1430
1431         for(i = orig; i <= term.bot-n; i++) {
1432                 temp = term.line[i];
1433                 term.line[i] = term.line[i+n];
1434                 term.line[i+n] = temp;
1435         }
1436
1437         selscroll(orig, -n);
1438 }
1439
1440 void
1441 selscroll(int orig, int n) {
1442         if(sel.ob.x == -1)
1443                 return;
1444
1445         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1446                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1447                         selclear(NULL);
1448                         return;
1449                 }
1450                 if(sel.type == SEL_RECTANGULAR) {
1451                         if(sel.ob.y < term.top)
1452                                 sel.ob.y = term.top;
1453                         if(sel.oe.y > term.bot)
1454                                 sel.oe.y = term.bot;
1455                 } else {
1456                         if(sel.ob.y < term.top) {
1457                                 sel.ob.y = term.top;
1458                                 sel.ob.x = 0;
1459                         }
1460                         if(sel.oe.y > term.bot) {
1461                                 sel.oe.y = term.bot;
1462                                 sel.oe.x = term.col;
1463                         }
1464                 }
1465                 selnormalize();
1466         }
1467 }
1468
1469 void
1470 tnewline(int first_col) {
1471         int y = term.c.y;
1472
1473         if(y == term.bot) {
1474                 tscrollup(term.top, 1);
1475         } else {
1476                 y++;
1477         }
1478         tmoveto(first_col ? 0 : term.c.x, y);
1479 }
1480
1481 void
1482 csiparse(void) {
1483         char *p = csiescseq.buf, *np;
1484         long int v;
1485
1486         csiescseq.narg = 0;
1487         if(*p == '?') {
1488                 csiescseq.priv = 1;
1489                 p++;
1490         }
1491
1492         csiescseq.buf[csiescseq.len] = '\0';
1493         while(p < csiescseq.buf+csiescseq.len) {
1494                 np = NULL;
1495                 v = strtol(p, &np, 10);
1496                 if(np == p)
1497                         v = 0;
1498                 if(v == LONG_MAX || v == LONG_MIN)
1499                         v = -1;
1500                 csiescseq.arg[csiescseq.narg++] = v;
1501                 p = np;
1502                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1503                         break;
1504                 p++;
1505         }
1506         csiescseq.mode = *p;
1507 }
1508
1509 /* for absolute user moves, when decom is set */
1510 void
1511 tmoveato(int x, int y) {
1512         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1513 }
1514
1515 void
1516 tmoveto(int x, int y) {
1517         int miny, maxy;
1518
1519         if(term.c.state & CURSOR_ORIGIN) {
1520                 miny = term.top;
1521                 maxy = term.bot;
1522         } else {
1523                 miny = 0;
1524                 maxy = term.row - 1;
1525         }
1526         LIMIT(x, 0, term.col-1);
1527         LIMIT(y, miny, maxy);
1528         term.c.state &= ~CURSOR_WRAPNEXT;
1529         term.c.x = x;
1530         term.c.y = y;
1531 }
1532
1533 void
1534 tsetchar(char *c, Glyph *attr, int x, int y) {
1535         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1536                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1537                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1538                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1539                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1540                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1541                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1542                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1543                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1544         };
1545
1546         /*
1547          * The table is proudly stolen from rxvt.
1548          */
1549         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1550                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1551                         c = vt100_0[c[0] - 0x41];
1552                 }
1553         }
1554
1555         if(term.line[y][x].mode & ATTR_WIDE) {
1556                 if(x+1 < term.col) {
1557                         term.line[y][x+1].c[0] = ' ';
1558                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1559                 }
1560         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1561                 term.line[y][x-1].c[0] = ' ';
1562                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1563         }
1564
1565         term.dirty[y] = 1;
1566         term.line[y][x] = *attr;
1567         memcpy(term.line[y][x].c, c, UTF_SIZ);
1568 }
1569
1570 void
1571 tclearregion(int x1, int y1, int x2, int y2) {
1572         int x, y, temp;
1573         Glyph *gp;
1574
1575         if(x1 > x2)
1576                 temp = x1, x1 = x2, x2 = temp;
1577         if(y1 > y2)
1578                 temp = y1, y1 = y2, y2 = temp;
1579
1580         LIMIT(x1, 0, term.col-1);
1581         LIMIT(x2, 0, term.col-1);
1582         LIMIT(y1, 0, term.row-1);
1583         LIMIT(y2, 0, term.row-1);
1584
1585         for(y = y1; y <= y2; y++) {
1586                 term.dirty[y] = 1;
1587                 for(x = x1; x <= x2; x++) {
1588                         gp = &term.line[y][x];
1589                         if(selected(x, y))
1590                                 selclear(NULL);
1591                         gp->fg = term.c.attr.fg;
1592                         gp->bg = term.c.attr.bg;
1593                         gp->mode = 0;
1594                         memcpy(gp->c, " ", 2);
1595                 }
1596         }
1597 }
1598
1599 void
1600 tdeletechar(int n) {
1601         int dst, src, size;
1602         Glyph *line;
1603
1604         LIMIT(n, 0, term.col - term.c.x);
1605
1606         dst = term.c.x;
1607         src = term.c.x + n;
1608         size = term.col - src;
1609         line = term.line[term.c.y];
1610
1611         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1612         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1613 }
1614
1615 void
1616 tinsertblank(int n) {
1617         int dst, src, size;
1618         Glyph *line;
1619
1620         LIMIT(n, 0, term.col - term.c.x);
1621
1622         dst = term.c.x + n;
1623         src = term.c.x;
1624         size = term.col - dst;
1625         line = term.line[term.c.y];
1626
1627         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1628         tclearregion(src, term.c.y, dst - 1, term.c.y);
1629 }
1630
1631 void
1632 tinsertblankline(int n) {
1633         if(BETWEEN(term.c.y, term.top, term.bot))
1634                 tscrolldown(term.c.y, n);
1635 }
1636
1637 void
1638 tdeleteline(int n) {
1639         if(BETWEEN(term.c.y, term.top, term.bot))
1640                 tscrollup(term.c.y, n);
1641 }
1642
1643 int32_t
1644 tdefcolor(int *attr, int *npar, int l) {
1645         int32_t idx = -1;
1646         uint r, g, b;
1647
1648         switch (attr[*npar + 1]) {
1649         case 2: /* direct color in RGB space */
1650                 if (*npar + 4 >= l) {
1651                         fprintf(stderr,
1652                                 "erresc(38): Incorrect number of parameters (%d)\n",
1653                                 *npar);
1654                         break;
1655                 }
1656                 r = attr[*npar + 2];
1657                 g = attr[*npar + 3];
1658                 b = attr[*npar + 4];
1659                 *npar += 4;
1660                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1661                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1662                                 r, g, b);
1663                 else
1664                         idx = TRUECOLOR(r, g, b);
1665                 break;
1666         case 5: /* indexed color */
1667                 if (*npar + 2 >= l) {
1668                         fprintf(stderr,
1669                                 "erresc(38): Incorrect number of parameters (%d)\n",
1670                                 *npar);
1671                         break;
1672                 }
1673                 *npar += 2;
1674                 if(!BETWEEN(attr[*npar], 0, 255))
1675                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1676                 else
1677                         idx = attr[*npar];
1678                 break;
1679         case 0: /* implemented defined (only foreground) */
1680         case 1: /* transparent */
1681         case 3: /* direct color in CMY space */
1682         case 4: /* direct color in CMYK space */
1683         default:
1684                 fprintf(stderr,
1685                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1686                 break;
1687         }
1688
1689         return idx;
1690 }
1691
1692 void
1693 tsetattr(int *attr, int l) {
1694         int i;
1695         int32_t idx;
1696
1697         for(i = 0; i < l; i++) {
1698                 switch(attr[i]) {
1699                 case 0:
1700                         term.c.attr.mode &= ~(
1701                                 ATTR_BOLD       |
1702                                 ATTR_FAINT      |
1703                                 ATTR_ITALIC     |
1704                                 ATTR_UNDERLINE  |
1705                                 ATTR_BLINK      |
1706                                 ATTR_REVERSE    |
1707                                 ATTR_INVISIBLE  |
1708                                 ATTR_STRUCK     );
1709                         term.c.attr.fg = defaultfg;
1710                         term.c.attr.bg = defaultbg;
1711                         break;
1712                 case 1:
1713                         term.c.attr.mode |= ATTR_BOLD;
1714                         break;
1715                 case 2:
1716                         term.c.attr.mode |= ATTR_FAINT;
1717                         break;
1718                 case 3:
1719                         term.c.attr.mode |= ATTR_ITALIC;
1720                         break;
1721                 case 4:
1722                         term.c.attr.mode |= ATTR_UNDERLINE;
1723                         break;
1724                 case 5: /* slow blink */
1725                         /* FALLTHROUGH */
1726                 case 6: /* rapid blink */
1727                         term.c.attr.mode |= ATTR_BLINK;
1728                         break;
1729                 case 7:
1730                         term.c.attr.mode |= ATTR_REVERSE;
1731                         break;
1732                 case 8:
1733                         term.c.attr.mode |= ATTR_INVISIBLE;
1734                         break;
1735                 case 9:
1736                         term.c.attr.mode |= ATTR_STRUCK;
1737                         break;
1738                 case 22:
1739                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1740                         break;
1741                 case 23:
1742                         term.c.attr.mode &= ~ATTR_ITALIC;
1743                         break;
1744                 case 24:
1745                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1746                         break;
1747                 case 25:
1748                         term.c.attr.mode &= ~ATTR_BLINK;
1749                         break;
1750                 case 27:
1751                         term.c.attr.mode &= ~ATTR_REVERSE;
1752                         break;
1753                 case 28:
1754                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1755                         break;
1756                 case 29:
1757                         term.c.attr.mode &= ~ATTR_STRUCK;
1758                         break;
1759                 case 38:
1760                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1761                                 term.c.attr.fg = idx;
1762                         break;
1763                 case 39:
1764                         term.c.attr.fg = defaultfg;
1765                         break;
1766                 case 48:
1767                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1768                                 term.c.attr.bg = idx;
1769                         break;
1770                 case 49:
1771                         term.c.attr.bg = defaultbg;
1772                         break;
1773                 default:
1774                         if(BETWEEN(attr[i], 30, 37)) {
1775                                 term.c.attr.fg = attr[i] - 30;
1776                         } else if(BETWEEN(attr[i], 40, 47)) {
1777                                 term.c.attr.bg = attr[i] - 40;
1778                         } else if(BETWEEN(attr[i], 90, 97)) {
1779                                 term.c.attr.fg = attr[i] - 90 + 8;
1780                         } else if(BETWEEN(attr[i], 100, 107)) {
1781                                 term.c.attr.bg = attr[i] - 100 + 8;
1782                         } else {
1783                                 fprintf(stderr,
1784                                         "erresc(default): gfx attr %d unknown\n",
1785                                         attr[i]), csidump();
1786                         }
1787                         break;
1788                 }
1789         }
1790 }
1791
1792 void
1793 tsetscroll(int t, int b) {
1794         int temp;
1795
1796         LIMIT(t, 0, term.row-1);
1797         LIMIT(b, 0, term.row-1);
1798         if(t > b) {
1799                 temp = t;
1800                 t = b;
1801                 b = temp;
1802         }
1803         term.top = t;
1804         term.bot = b;
1805 }
1806
1807 void
1808 tsetmode(bool priv, bool set, int *args, int narg) {
1809         int *lim, mode;
1810         bool alt;
1811
1812         for(lim = args + narg; args < lim; ++args) {
1813                 if(priv) {
1814                         switch(*args) {
1815                         case 1: /* DECCKM -- Cursor key */
1816                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1817                                 break;
1818                         case 5: /* DECSCNM -- Reverse video */
1819                                 mode = term.mode;
1820                                 MODBIT(term.mode, set, MODE_REVERSE);
1821                                 if(mode != term.mode)
1822                                         redraw(REDRAW_TIMEOUT);
1823                                 break;
1824                         case 6: /* DECOM -- Origin */
1825                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1826                                 tmoveato(0, 0);
1827                                 break;
1828                         case 7: /* DECAWM -- Auto wrap */
1829                                 MODBIT(term.mode, set, MODE_WRAP);
1830                                 break;
1831                         case 0:  /* Error (IGNORED) */
1832                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1833                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1834                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1835                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1836                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1837                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1838                         case 42: /* DECNRCM -- National characters (IGNORED) */
1839                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1840                                 break;
1841                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1842                                 MODBIT(term.mode, !set, MODE_HIDE);
1843                                 break;
1844                         case 9:    /* X10 mouse compatibility mode */
1845                                 xsetpointermotion(0);
1846                                 MODBIT(term.mode, 0, MODE_MOUSE);
1847                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1848                                 break;
1849                         case 1000: /* 1000: report button press */
1850                                 xsetpointermotion(0);
1851                                 MODBIT(term.mode, 0, MODE_MOUSE);
1852                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1853                                 break;
1854                         case 1002: /* 1002: report motion on button press */
1855                                 xsetpointermotion(0);
1856                                 MODBIT(term.mode, 0, MODE_MOUSE);
1857                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1858                                 break;
1859                         case 1003: /* 1003: enable all mouse motions */
1860                                 xsetpointermotion(set);
1861                                 MODBIT(term.mode, 0, MODE_MOUSE);
1862                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1863                                 break;
1864                         case 1004: /* 1004: send focus events to tty */
1865                                 MODBIT(term.mode, set, MODE_FOCUS);
1866                                 break;
1867                         case 1006: /* 1006: extended reporting mode */
1868                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1869                                 break;
1870                         case 1034:
1871                                 MODBIT(term.mode, set, MODE_8BIT);
1872                                 break;
1873                         case 1049: /* swap screen & set/restore cursor as xterm */
1874                                 if (!allowaltscreen)
1875                                         break;
1876                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1877                                 /* FALLTHROUGH */
1878                         case 47: /* swap screen */
1879                         case 1047:
1880                                 if (!allowaltscreen)
1881                                         break;
1882                                 alt = IS_SET(MODE_ALTSCREEN);
1883                                 if(alt) {
1884                                         tclearregion(0, 0, term.col-1,
1885                                                         term.row-1);
1886                                 }
1887                                 if(set ^ alt) /* set is always 1 or 0 */
1888                                         tswapscreen();
1889                                 if(*args != 1049)
1890                                         break;
1891                                 /* FALLTHROUGH */
1892                         case 1048:
1893                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1894                                 break;
1895                         case 2004: /* 2004: bracketed paste mode */
1896                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1897                                 break;
1898                         /* Not implemented mouse modes. See comments there. */
1899                         case 1001: /* mouse highlight mode; can hang the
1900                                       terminal by design when implemented. */
1901                         case 1005: /* UTF-8 mouse mode; will confuse
1902                                       applications not supporting UTF-8
1903                                       and luit. */
1904                         case 1015: /* urxvt mangled mouse mode; incompatible
1905                                       and can be mistaken for other control
1906                                       codes. */
1907                         default:
1908                                 fprintf(stderr,
1909                                         "erresc: unknown private set/reset mode %d\n",
1910                                         *args);
1911                                 break;
1912                         }
1913                 } else {
1914                         switch(*args) {
1915                         case 0:  /* Error (IGNORED) */
1916                                 break;
1917                         case 2:  /* KAM -- keyboard action */
1918                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1919                                 break;
1920                         case 4:  /* IRM -- Insertion-replacement */
1921                                 MODBIT(term.mode, set, MODE_INSERT);
1922                                 break;
1923                         case 12: /* SRM -- Send/Receive */
1924                                 MODBIT(term.mode, !set, MODE_ECHO);
1925                                 break;
1926                         case 20: /* LNM -- Linefeed/new line */
1927                                 MODBIT(term.mode, set, MODE_CRLF);
1928                                 break;
1929                         default:
1930                                 fprintf(stderr,
1931                                         "erresc: unknown set/reset mode %d\n",
1932                                         *args);
1933                                 break;
1934                         }
1935                 }
1936         }
1937 }
1938
1939 void
1940 csihandle(void) {
1941         char buf[40];
1942         int len;
1943
1944         switch(csiescseq.mode) {
1945         default:
1946         unknown:
1947                 fprintf(stderr, "erresc: unknown csi ");
1948                 csidump();
1949                 /* die(""); */
1950                 break;
1951         case '@': /* ICH -- Insert <n> blank char */
1952                 DEFAULT(csiescseq.arg[0], 1);
1953                 tinsertblank(csiescseq.arg[0]);
1954                 break;
1955         case 'A': /* CUU -- Cursor <n> Up */
1956                 DEFAULT(csiescseq.arg[0], 1);
1957                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1958                 break;
1959         case 'B': /* CUD -- Cursor <n> Down */
1960         case 'e': /* VPR --Cursor <n> Down */
1961                 DEFAULT(csiescseq.arg[0], 1);
1962                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1963                 break;
1964         case 'i': /* MC -- Media Copy */
1965                 switch(csiescseq.arg[0]) {
1966                 case 0:
1967                         tdump();
1968                         break;
1969                 case 1:
1970                         tdumpline(term.c.y);
1971                         break;
1972                 case 2:
1973                         tdumpsel();
1974                         break;
1975                 case 4:
1976                         term.mode &= ~MODE_PRINT;
1977                         break;
1978                 case 5:
1979                         term.mode |= MODE_PRINT;
1980                         break;
1981                 }
1982                 break;
1983         case 'c': /* DA -- Device Attributes */
1984                 if(csiescseq.arg[0] == 0)
1985                         ttywrite(vtiden, sizeof(vtiden) - 1);
1986                 break;
1987         case 'C': /* CUF -- Cursor <n> Forward */
1988         case 'a': /* HPR -- Cursor <n> Forward */
1989                 DEFAULT(csiescseq.arg[0], 1);
1990                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1991                 break;
1992         case 'D': /* CUB -- Cursor <n> Backward */
1993                 DEFAULT(csiescseq.arg[0], 1);
1994                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1995                 break;
1996         case 'E': /* CNL -- Cursor <n> Down and first col */
1997                 DEFAULT(csiescseq.arg[0], 1);
1998                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1999                 break;
2000         case 'F': /* CPL -- Cursor <n> Up and first col */
2001                 DEFAULT(csiescseq.arg[0], 1);
2002                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2003                 break;
2004         case 'g': /* TBC -- Tabulation clear */
2005                 switch(csiescseq.arg[0]) {
2006                 case 0: /* clear current tab stop */
2007                         term.tabs[term.c.x] = 0;
2008                         break;
2009                 case 3: /* clear all the tabs */
2010                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2011                         break;
2012                 default:
2013                         goto unknown;
2014                 }
2015                 break;
2016         case 'G': /* CHA -- Move to <col> */
2017         case '`': /* HPA */
2018                 DEFAULT(csiescseq.arg[0], 1);
2019                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2020                 break;
2021         case 'H': /* CUP -- Move to <row> <col> */
2022         case 'f': /* HVP */
2023                 DEFAULT(csiescseq.arg[0], 1);
2024                 DEFAULT(csiescseq.arg[1], 1);
2025                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2026                 break;
2027         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2028                 DEFAULT(csiescseq.arg[0], 1);
2029                 tputtab(csiescseq.arg[0]);
2030                 break;
2031         case 'J': /* ED -- Clear screen */
2032                 selclear(NULL);
2033                 switch(csiescseq.arg[0]) {
2034                 case 0: /* below */
2035                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2036                         if(term.c.y < term.row-1) {
2037                                 tclearregion(0, term.c.y+1, term.col-1,
2038                                                 term.row-1);
2039                         }
2040                         break;
2041                 case 1: /* above */
2042                         if(term.c.y > 1)
2043                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2044                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2045                         break;
2046                 case 2: /* all */
2047                         tclearregion(0, 0, term.col-1, term.row-1);
2048                         break;
2049                 default:
2050                         goto unknown;
2051                 }
2052                 break;
2053         case 'K': /* EL -- Clear line */
2054                 switch(csiescseq.arg[0]) {
2055                 case 0: /* right */
2056                         tclearregion(term.c.x, term.c.y, term.col-1,
2057                                         term.c.y);
2058                         break;
2059                 case 1: /* left */
2060                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2061                         break;
2062                 case 2: /* all */
2063                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2064                         break;
2065                 }
2066                 break;
2067         case 'S': /* SU -- Scroll <n> line up */
2068                 DEFAULT(csiescseq.arg[0], 1);
2069                 tscrollup(term.top, csiescseq.arg[0]);
2070                 break;
2071         case 'T': /* SD -- Scroll <n> line down */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 tscrolldown(term.top, csiescseq.arg[0]);
2074                 break;
2075         case 'L': /* IL -- Insert <n> blank lines */
2076                 DEFAULT(csiescseq.arg[0], 1);
2077                 tinsertblankline(csiescseq.arg[0]);
2078                 break;
2079         case 'l': /* RM -- Reset Mode */
2080                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2081                 break;
2082         case 'M': /* DL -- Delete <n> lines */
2083                 DEFAULT(csiescseq.arg[0], 1);
2084                 tdeleteline(csiescseq.arg[0]);
2085                 break;
2086         case 'X': /* ECH -- Erase <n> char */
2087                 DEFAULT(csiescseq.arg[0], 1);
2088                 tclearregion(term.c.x, term.c.y,
2089                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2090                 break;
2091         case 'P': /* DCH -- Delete <n> char */
2092                 DEFAULT(csiescseq.arg[0], 1);
2093                 tdeletechar(csiescseq.arg[0]);
2094                 break;
2095         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2096                 DEFAULT(csiescseq.arg[0], 1);
2097                 tputtab(-csiescseq.arg[0]);
2098                 break;
2099         case 'd': /* VPA -- Move to <row> */
2100                 DEFAULT(csiescseq.arg[0], 1);
2101                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2102                 break;
2103         case 'h': /* SM -- Set terminal mode */
2104                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2105                 break;
2106         case 'm': /* SGR -- Terminal attribute (color) */
2107                 tsetattr(csiescseq.arg, csiescseq.narg);
2108                 break;
2109         case 'n': /* DSR – Device Status Report (cursor position) */
2110                 if (csiescseq.arg[0] == 6) {
2111                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2112                                         term.c.y+1, term.c.x+1);
2113                         ttywrite(buf, len);
2114                 }
2115                 break;
2116         case 'r': /* DECSTBM -- Set Scrolling Region */
2117                 if(csiescseq.priv) {
2118                         goto unknown;
2119                 } else {
2120                         DEFAULT(csiescseq.arg[0], 1);
2121                         DEFAULT(csiescseq.arg[1], term.row);
2122                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2123                         tmoveato(0, 0);
2124                 }
2125                 break;
2126         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2127                 tcursor(CURSOR_SAVE);
2128                 break;
2129         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2130                 tcursor(CURSOR_LOAD);
2131                 break;
2132         }
2133 }
2134
2135 void
2136 csidump(void) {
2137         int i;
2138         uint c;
2139
2140         printf("ESC[");
2141         for(i = 0; i < csiescseq.len; i++) {
2142                 c = csiescseq.buf[i] & 0xff;
2143                 if(isprint(c)) {
2144                         putchar(c);
2145                 } else if(c == '\n') {
2146                         printf("(\\n)");
2147                 } else if(c == '\r') {
2148                         printf("(\\r)");
2149                 } else if(c == 0x1b) {
2150                         printf("(\\e)");
2151                 } else {
2152                         printf("(%02x)", c);
2153                 }
2154         }
2155         putchar('\n');
2156 }
2157
2158 void
2159 csireset(void) {
2160         memset(&csiescseq, 0, sizeof(csiescseq));
2161 }
2162
2163 void
2164 strhandle(void) {
2165         char *p = NULL;
2166         int j, narg, par;
2167
2168         term.esc &= ~(ESC_STR_END|ESC_STR);
2169         strparse();
2170         narg = strescseq.narg;
2171         par = atoi(strescseq.args[0]);
2172
2173         switch(strescseq.type) {
2174         case ']': /* OSC -- Operating System Command */
2175                 switch(par) {
2176                 case 0:
2177                 case 1:
2178                 case 2:
2179                         if(narg > 1)
2180                                 xsettitle(strescseq.args[1]);
2181                         return;
2182                 case 4: /* color set */
2183                         if(narg < 3)
2184                                 break;
2185                         p = strescseq.args[2];
2186                         /* FALLTHROUGH */
2187                 case 104: /* color reset, here p = NULL */
2188                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2189                         if(xsetcolorname(j, p)) {
2190                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2191                         } else {
2192                                 /*
2193                                  * TODO if defaultbg color is changed, borders
2194                                  * are dirty
2195                                  */
2196                                 redraw(0);
2197                         }
2198                         return;
2199                 }
2200                 break;
2201         case 'k': /* old title set compatibility */
2202                 xsettitle(strescseq.args[0]);
2203                 return;
2204         case 'P': /* DCS -- Device Control String */
2205         case '_': /* APC -- Application Program Command */
2206         case '^': /* PM -- Privacy Message */
2207                 return;
2208         }
2209
2210         fprintf(stderr, "erresc: unknown str ");
2211         strdump();
2212 }
2213
2214 void
2215 strparse(void) {
2216         char *p = strescseq.buf;
2217
2218         strescseq.narg = 0;
2219         strescseq.buf[strescseq.len] = '\0';
2220         while(p && strescseq.narg < STR_ARG_SIZ)
2221                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2222 }
2223
2224 void
2225 strdump(void) {
2226         int i;
2227         uint c;
2228
2229         printf("ESC%c", strescseq.type);
2230         for(i = 0; i < strescseq.len; i++) {
2231                 c = strescseq.buf[i] & 0xff;
2232                 if(c == '\0') {
2233                         return;
2234                 } else if(isprint(c)) {
2235                         putchar(c);
2236                 } else if(c == '\n') {
2237                         printf("(\\n)");
2238                 } else if(c == '\r') {
2239                         printf("(\\r)");
2240                 } else if(c == 0x1b) {
2241                         printf("(\\e)");
2242                 } else {
2243                         printf("(%02x)", c);
2244                 }
2245         }
2246         printf("ESC\\\n");
2247 }
2248
2249 void
2250 strreset(void) {
2251         memset(&strescseq, 0, sizeof(strescseq));
2252 }
2253
2254 void
2255 tprinter(char *s, size_t len) {
2256         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2257                 fprintf(stderr, "Error writing in %s:%s\n",
2258                         opt_io, strerror(errno));
2259                 close(iofd);
2260                 iofd = -1;
2261         }
2262 }
2263
2264 void
2265 toggleprinter(const Arg *arg) {
2266         term.mode ^= MODE_PRINT;
2267 }
2268
2269 void
2270 printscreen(const Arg *arg) {
2271         tdump();
2272 }
2273
2274 void
2275 printsel(const Arg *arg) {
2276         tdumpsel();
2277 }
2278
2279 void
2280 tdumpsel(void) {
2281         char *ptr;
2282
2283         if((ptr = getsel())) {
2284                 tprinter(ptr, strlen(ptr));
2285                 free(ptr);
2286         }
2287 }
2288
2289 void
2290 tdumpline(int n) {
2291         Glyph *bp, *end;
2292
2293         bp = &term.line[n][0];
2294         end = &bp[MIN(tlinelen(n), term.col) - 1];
2295         if(bp != end || bp->c[0] != ' ') {
2296                 for( ;bp <= end; ++bp)
2297                         tprinter(bp->c, utf8len(bp->c));
2298         }
2299         tprinter("\n", 1);
2300 }
2301
2302 void
2303 tdump(void) {
2304         int i;
2305
2306         for(i = 0; i < term.row; ++i)
2307                 tdumpline(i);
2308 }
2309
2310 void
2311 tputtab(int n) {
2312         uint x = term.c.x;
2313
2314         if(n > 0) {
2315                 while(x < term.col && n--)
2316                         for(++x; x < term.col && !term.tabs[x]; ++x)
2317                                 /* nothing */ ;
2318         } else if(n < 0) {
2319                 while(x > 0 && n++)
2320                         for(--x; x > 0 && !term.tabs[x]; --x)
2321                                 /* nothing */ ;
2322         }
2323         tmoveto(x, term.c.y);
2324 }
2325
2326 void
2327 techo(char *buf, int len) {
2328         for(; len > 0; buf++, len--) {
2329                 char c = *buf;
2330
2331                 if(ISCONTROL((uchar) c)) { /* control code */
2332                         if(c & 0x80) {
2333                                 c &= 0x7f;
2334                                 tputc("^", 1);
2335                                 tputc("[", 1);
2336                         } else if(c != '\n' && c != '\r' && c != '\t') {
2337                                 c ^= 0x40;
2338                                 tputc("^", 1);
2339                         }
2340                         tputc(&c, 1);
2341                 } else {
2342                         break;
2343                 }
2344         }
2345         if(len)
2346                 tputc(buf, len);
2347 }
2348
2349 void
2350 tdeftran(char ascii) {
2351         static char cs[] = "0B";
2352         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2353         char *p;
2354
2355         if((p = strchr(cs, ascii)) == NULL) {
2356                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2357         } else {
2358                 term.trantbl[term.icharset] = vcs[p - cs];
2359         }
2360 }
2361
2362 void
2363 tdectest(char c) {
2364         static char E[UTF_SIZ] = "E";
2365         int x, y;
2366
2367         if(c == '8') { /* DEC screen alignment test. */
2368                 for(x = 0; x < term.col; ++x) {
2369                         for(y = 0; y < term.row; ++y)
2370                                 tsetchar(E, &term.c.attr, x, y);
2371                 }
2372         }
2373 }
2374
2375 void
2376 tstrsequence(uchar c) {
2377         if (c & 0x80) {
2378                 switch (c) {
2379                 case 0x90:   /* DCS -- Device Control String */
2380                         c = 'P';
2381                         break;
2382                 case 0x9f:   /* APC -- Application Program Command */
2383                         c = '_';
2384                         break;
2385                 case 0x9e:   /* PM -- Privacy Message */
2386                         c = '^';
2387                         break;
2388                 case 0x9d:   /* OSC -- Operating System Command */
2389                         c = ']';
2390                         break;
2391                 }
2392         }
2393         strreset();
2394         strescseq.type = c;
2395         term.esc |= ESC_STR;
2396         return;
2397 }
2398
2399 void
2400 tcontrolcode(uchar ascii) {
2401         static char question[UTF_SIZ] = "?";
2402
2403         switch(ascii) {
2404         case '\t':   /* HT */
2405                 tputtab(1);
2406                 return;
2407         case '\b':   /* BS */
2408                 tmoveto(term.c.x-1, term.c.y);
2409                 return;
2410         case '\r':   /* CR */
2411                 tmoveto(0, term.c.y);
2412                 return;
2413         case '\f':   /* LF */
2414         case '\v':   /* VT */
2415         case '\n':   /* LF */
2416                 /* go to first col if the mode is set */
2417                 tnewline(IS_SET(MODE_CRLF));
2418                 return;
2419         case '\a':   /* BEL */
2420                 if(term.esc & ESC_STR_END) {
2421                         /* backwards compatibility to xterm */
2422                         strhandle();
2423                 } else {
2424                         if(!(xw.state & WIN_FOCUSED))
2425                                 xseturgency(1);
2426                         if (bellvolume)
2427                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2428                 }
2429                 break;
2430         case '\033': /* ESC */
2431                 csireset();
2432                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2433                 term.esc |= ESC_START;
2434                 return;
2435         case '\016': /* SO (LS1 -- Locking shift 1) */
2436         case '\017': /* SI (LS0 -- Locking shift 0) */
2437                 term.charset = 1 - (ascii - '\016');
2438                 return;
2439         case '\032': /* SUB */
2440                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2441         case '\030': /* CAN */
2442                 csireset();
2443                 break;
2444         case '\005': /* ENQ (IGNORED) */
2445         case '\000': /* NUL (IGNORED) */
2446         case '\021': /* XON (IGNORED) */
2447         case '\023': /* XOFF (IGNORED) */
2448         case 0177:   /* DEL (IGNORED) */
2449                 return;
2450         case 0x84:   /* TODO: IND */
2451                 break;
2452         case 0x85:   /* NEL -- Next line */
2453                 tnewline(1); /* always go to first col */
2454                 break;
2455         case 0x88:   /* HTS -- Horizontal tab stop */
2456                 term.tabs[term.c.x] = 1;
2457                 break;
2458         case 0x8d:   /* TODO: RI */
2459         case 0x8e:   /* TODO: SS2 */
2460         case 0x8f:   /* TODO: SS3 */
2461         case 0x98:   /* TODO: SOS */
2462                 break;
2463         case 0x9a:   /* DECID -- Identify Terminal */
2464                 ttywrite(vtiden, sizeof(vtiden) - 1);
2465                 break;
2466         case 0x9b:   /* TODO: CSI */
2467         case 0x9c:   /* TODO: ST */
2468                 break;
2469         case 0x90:   /* DCS -- Device Control String */
2470         case 0x9f:   /* APC -- Application Program Command */
2471         case 0x9e:   /* PM -- Privacy Message */
2472         case 0x9d:   /* OSC -- Operating System Command */
2473                 tstrsequence(ascii);
2474                 return;
2475         }
2476         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2477         term.esc &= ~(ESC_STR_END|ESC_STR);
2478         return;
2479 }
2480
2481 /*
2482  * returns 1 when the sequence is finished and it hasn't to read
2483  * more characters for this sequence, otherwise 0
2484  */
2485 int
2486 eschandle(uchar ascii) {
2487         switch(ascii) {
2488         case '[':
2489                 term.esc |= ESC_CSI;
2490                 return 0;
2491         case '#':
2492                 term.esc |= ESC_TEST;
2493                 return 0;
2494         case 'P': /* DCS -- Device Control String */
2495         case '_': /* APC -- Application Program Command */
2496         case '^': /* PM -- Privacy Message */
2497         case ']': /* OSC -- Operating System Command */
2498         case 'k': /* old title set compatibility */
2499                 tstrsequence(ascii);
2500                 return 0;
2501         case 'n': /* LS2 -- Locking shift 2 */
2502         case 'o': /* LS3 -- Locking shift 3 */
2503                 term.charset = 2 + (ascii - 'n');
2504                 break;
2505         case '(': /* GZD4 -- set primary charset G0 */
2506         case ')': /* G1D4 -- set secondary charset G1 */
2507         case '*': /* G2D4 -- set tertiary charset G2 */
2508         case '+': /* G3D4 -- set quaternary charset G3 */
2509                 term.icharset = ascii - '(';
2510                 term.esc |= ESC_ALTCHARSET;
2511                 return 0;
2512         case 'D': /* IND -- Linefeed */
2513                 if(term.c.y == term.bot) {
2514                         tscrollup(term.top, 1);
2515                 } else {
2516                         tmoveto(term.c.x, term.c.y+1);
2517                 }
2518                 break;
2519         case 'E': /* NEL -- Next line */
2520                 tnewline(1); /* always go to first col */
2521                 break;
2522         case 'H': /* HTS -- Horizontal tab stop */
2523                 term.tabs[term.c.x] = 1;
2524                 break;
2525         case 'M': /* RI -- Reverse index */
2526                 if(term.c.y == term.top) {
2527                         tscrolldown(term.top, 1);
2528                 } else {
2529                         tmoveto(term.c.x, term.c.y-1);
2530                 }
2531                 break;
2532         case 'Z': /* DECID -- Identify Terminal */
2533                 ttywrite(vtiden, sizeof(vtiden) - 1);
2534                 break;
2535         case 'c': /* RIS -- Reset to inital state */
2536                 treset();
2537                 xresettitle();
2538                 xloadcols();
2539                 break;
2540         case '=': /* DECPAM -- Application keypad */
2541                 term.mode |= MODE_APPKEYPAD;
2542                 break;
2543         case '>': /* DECPNM -- Normal keypad */
2544                 term.mode &= ~MODE_APPKEYPAD;
2545                 break;
2546         case '7': /* DECSC -- Save Cursor */
2547                 tcursor(CURSOR_SAVE);
2548                 break;
2549         case '8': /* DECRC -- Restore Cursor */
2550                 tcursor(CURSOR_LOAD);
2551                 break;
2552         case '\\': /* ST -- String Terminator */
2553                 if(term.esc & ESC_STR_END)
2554                         strhandle();
2555                 break;
2556         default:
2557                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2558                         (uchar) ascii, isprint(ascii)? ascii:'.');
2559                 break;
2560         }
2561         return 1;
2562 }
2563
2564 void
2565 tputc(char *c, int len) {
2566         uchar ascii;
2567         bool control;
2568         long unicodep;
2569         int width;
2570         Glyph *gp;
2571
2572         if(len == 1) {
2573                 width = 1;
2574                 unicodep = ascii = *c;
2575         } else {
2576                 utf8decode(c, &unicodep, UTF_SIZ);
2577                 width = wcwidth(unicodep);
2578                 control = ISCONTROLC1(unicodep);
2579                 ascii = unicodep;
2580         }
2581
2582         if(IS_SET(MODE_PRINT))
2583                 tprinter(c, len);
2584         control = ISCONTROL(unicodep);
2585
2586         /*
2587          * STR sequence must be checked before anything else
2588          * because it uses all following characters until it
2589          * receives a ESC, a SUB, a ST or any other C1 control
2590          * character.
2591          */
2592         if(term.esc & ESC_STR) {
2593                 if(width == 1 &&
2594                    (ascii == '\a' || ascii == 030 ||
2595                     ascii == 032  || ascii == 033 ||
2596                     ISCONTROLC1(unicodep))) {
2597                         term.esc &= ~(ESC_START|ESC_STR);
2598                         term.esc |= ESC_STR_END;
2599                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2600                         memmove(&strescseq.buf[strescseq.len], c, len);
2601                         strescseq.len += len;
2602                         return;
2603                 } else {
2604                 /*
2605                  * Here is a bug in terminals. If the user never sends
2606                  * some code to stop the str or esc command, then st
2607                  * will stop responding. But this is better than
2608                  * silently failing with unknown characters. At least
2609                  * then users will report back.
2610                  *
2611                  * In the case users ever get fixed, here is the code:
2612                  */
2613                 /*
2614                  * term.esc = 0;
2615                  * strhandle();
2616                  */
2617                         return;
2618                 }
2619         }
2620
2621         /*
2622          * Actions of control codes must be performed as soon they arrive
2623          * because they can be embedded inside a control sequence, and
2624          * they must not cause conflicts with sequences.
2625          */
2626         if(control) {
2627                 tcontrolcode(ascii);
2628                 /*
2629                  * control codes are not shown ever
2630                  */
2631                 return;
2632         } else if(term.esc & ESC_START) {
2633                 if(term.esc & ESC_CSI) {
2634                         csiescseq.buf[csiescseq.len++] = ascii;
2635                         if(BETWEEN(ascii, 0x40, 0x7E)
2636                                         || csiescseq.len >= \
2637                                         sizeof(csiescseq.buf)-1) {
2638                                 term.esc = 0;
2639                                 csiparse();
2640                                 csihandle();
2641                         }
2642                         return;
2643                 } else if(term.esc & ESC_ALTCHARSET) {
2644                         tdeftran(ascii);
2645                 } else if(term.esc & ESC_TEST) {
2646                         tdectest(ascii);
2647                 } else {
2648                         if (!eschandle(ascii))
2649                                 return;
2650                         /* sequence already finished */
2651                 }
2652                 term.esc = 0;
2653                 /*
2654                  * All characters which form part of a sequence are not
2655                  * printed
2656                  */
2657                 return;
2658         }
2659         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2660                 selclear(NULL);
2661
2662         gp = &term.line[term.c.y][term.c.x];
2663         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2664                 gp->mode |= ATTR_WRAP;
2665                 tnewline(1);
2666         }
2667
2668         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2669                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2670
2671         if(term.c.x+width > term.col)
2672                 tnewline(1);
2673
2674         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2675
2676         if(width == 2) {
2677                 gp->mode |= ATTR_WIDE;
2678                 if(term.c.x+1 < term.col) {
2679                         gp[1].c[0] = '\0';
2680                         gp[1].mode = ATTR_WDUMMY;
2681                 }
2682         }
2683         if(term.c.x+width < term.col) {
2684                 tmoveto(term.c.x+width, term.c.y);
2685         } else {
2686                 term.c.state |= CURSOR_WRAPNEXT;
2687         }
2688 }
2689
2690 void
2691 tresize(int col, int row) {
2692         int i;
2693         int minrow = MIN(row, term.row);
2694         int mincol = MIN(col, term.col);
2695         int slide = term.c.y - row + 1;
2696         bool *bp;
2697         TCursor c;
2698
2699         if(col < 1 || row < 1) {
2700                 fprintf(stderr,
2701                         "tresize: error resizing to %dx%d\n", col, row);
2702                 return;
2703         }
2704
2705         /* free unneeded rows */
2706         i = 0;
2707         if(slide > 0) {
2708                 /*
2709                  * slide screen to keep cursor where we expect it -
2710                  * tscrollup would work here, but we can optimize to
2711                  * memmove because we're freeing the earlier lines
2712                  */
2713                 for(/* i = 0 */; i < slide; i++) {
2714                         free(term.line[i]);
2715                         free(term.alt[i]);
2716                 }
2717                 memmove(term.line, term.line + slide, row * sizeof(Line));
2718                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2719         }
2720         for(i += row; i < term.row; i++) {
2721                 free(term.line[i]);
2722                 free(term.alt[i]);
2723         }
2724
2725         /* resize to new height */
2726         term.line = xrealloc(term.line, row * sizeof(Line));
2727         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2728         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2729         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2730
2731         /* resize each row to new width, zero-pad if needed */
2732         for(i = 0; i < minrow; i++) {
2733                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2734                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2735         }
2736
2737         /* allocate any new rows */
2738         for(/* i == minrow */; i < row; i++) {
2739                 term.line[i] = xmalloc(col * sizeof(Glyph));
2740                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2741         }
2742         if(col > term.col) {
2743                 bp = term.tabs + term.col;
2744
2745                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2746                 while(--bp > term.tabs && !*bp)
2747                         /* nothing */ ;
2748                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2749                         *bp = 1;
2750         }
2751         /* update terminal size */
2752         term.col = col;
2753         term.row = row;
2754         /* reset scrolling region */
2755         tsetscroll(0, row-1);
2756         /* make use of the LIMIT in tmoveto */
2757         tmoveto(term.c.x, term.c.y);
2758         /* Clearing both screens (it makes dirty all lines) */
2759         c = term.c;
2760         for(i = 0; i < 2; i++) {
2761                 if(mincol < col && 0 < minrow) {
2762                         tclearregion(mincol, 0, col - 1, minrow - 1);
2763                 }
2764                 if(0 < col && minrow < row) {
2765                         tclearregion(0, minrow, col - 1, row - 1);
2766                 }
2767                 tswapscreen();
2768                 tcursor(CURSOR_LOAD);
2769         }
2770         term.c = c;
2771 }
2772
2773 void
2774 xresize(int col, int row) {
2775         xw.tw = MAX(1, col * xw.cw);
2776         xw.th = MAX(1, row * xw.ch);
2777
2778         XFreePixmap(xw.dpy, xw.buf);
2779         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2780                         DefaultDepth(xw.dpy, xw.scr));
2781         XftDrawChange(xw.draw, xw.buf);
2782         xclear(0, 0, xw.w, xw.h);
2783 }
2784
2785 static inline ushort
2786 sixd_to_16bit(int x) {
2787         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2788 }
2789
2790 void
2791 xloadcols(void) {
2792         int i;
2793         XRenderColor color = { .alpha = 0xffff };
2794         static bool loaded;
2795         Color *cp;
2796
2797         if(loaded) {
2798                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2799                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2800         }
2801
2802         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2803         for(i = 0; i < LEN(colorname); i++) {
2804                 if(!colorname[i])
2805                         continue;
2806                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2807                         die("Could not allocate color '%s'\n", colorname[i]);
2808                 }
2809         }
2810
2811         /* load colors [16-231] ; same colors as xterm */
2812         for(i = 16; i < 6*6*6+16; i++) {
2813                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2814                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2815                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2816                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2817                         die("Could not allocate color %d\n", i);
2818         }
2819
2820         /* load colors [232-255] ; grayscale */
2821         for(; i < 256; i++) {
2822                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2823                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2824                         die("Could not allocate color %d\n", i);
2825         }
2826         loaded = true;
2827 }
2828
2829 int
2830 xsetcolorname(int x, const char *name) {
2831         XRenderColor color = { .alpha = 0xffff };
2832         Color ncolor;
2833
2834         if(!BETWEEN(x, 0, LEN(colorname)))
2835                 return 1;
2836
2837         if(!name) {
2838                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2839                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2840                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2841                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2842                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2843                                                 xw.cmap, &color, &ncolor)) {
2844                                 return 1;
2845                         }
2846
2847                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2848                         dc.col[x] = ncolor;
2849                         return 0;
2850                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2851                         color.red = color.green = color.blue = \
2852                                     0x0808 + 0x0a0a * (x - (16 + 216));
2853                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2854                                                 xw.cmap, &color, &ncolor)) {
2855                                 return 1;
2856                         }
2857
2858                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2859                         dc.col[x] = ncolor;
2860                         return 0;
2861                 } else { /* system colors */
2862                         name = colorname[x];
2863                 }
2864         }
2865         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2866                 return 1;
2867
2868         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2869         dc.col[x] = ncolor;
2870         return 0;
2871 }
2872
2873 void
2874 xtermclear(int col1, int row1, int col2, int row2) {
2875         XftDrawRect(xw.draw,
2876                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2877                         borderpx + col1 * xw.cw,
2878                         borderpx + row1 * xw.ch,
2879                         (col2-col1+1) * xw.cw,
2880                         (row2-row1+1) * xw.ch);
2881 }
2882
2883 /*
2884  * Absolute coordinates.
2885  */
2886 void
2887 xclear(int x1, int y1, int x2, int y2) {
2888         XftDrawRect(xw.draw,
2889                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2890                         x1, y1, x2-x1, y2-y1);
2891 }
2892
2893 void
2894 xhints(void) {
2895         XClassHint class = {opt_class ? opt_class : termname, termname};
2896         XWMHints wm = {.flags = InputHint, .input = 1};
2897         XSizeHints *sizeh = NULL;
2898
2899         sizeh = XAllocSizeHints();
2900
2901         sizeh->flags = PSize | PResizeInc | PBaseSize;
2902         sizeh->height = xw.h;
2903         sizeh->width = xw.w;
2904         sizeh->height_inc = xw.ch;
2905         sizeh->width_inc = xw.cw;
2906         sizeh->base_height = 2 * borderpx;
2907         sizeh->base_width = 2 * borderpx;
2908         if(xw.isfixed == True) {
2909                 sizeh->flags |= PMaxSize | PMinSize;
2910                 sizeh->min_width = sizeh->max_width = xw.w;
2911                 sizeh->min_height = sizeh->max_height = xw.h;
2912         }
2913         if(xw.gm & (XValue|YValue)) {
2914                 sizeh->flags |= USPosition | PWinGravity;
2915                 sizeh->x = xw.l;
2916                 sizeh->y = xw.t;
2917                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2918         }
2919
2920         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2921                         &class);
2922         XFree(sizeh);
2923 }
2924
2925 int
2926 xgeommasktogravity(int mask) {
2927         switch(mask & (XNegative|YNegative)) {
2928         case 0:
2929                 return NorthWestGravity;
2930         case XNegative:
2931                 return NorthEastGravity;
2932         case YNegative:
2933                 return SouthWestGravity;
2934         }
2935         return SouthEastGravity;
2936 }
2937
2938 int
2939 xloadfont(Font *f, FcPattern *pattern) {
2940         FcPattern *match;
2941         FcResult result;
2942
2943         match = FcFontMatch(NULL, pattern, &result);
2944         if(!match)
2945                 return 1;
2946
2947         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2948                 FcPatternDestroy(match);
2949                 return 1;
2950         }
2951
2952         f->set = NULL;
2953         f->pattern = FcPatternDuplicate(pattern);
2954
2955         f->ascent = f->match->ascent;
2956         f->descent = f->match->descent;
2957         f->lbearing = 0;
2958         f->rbearing = f->match->max_advance_width;
2959
2960         f->height = f->ascent + f->descent;
2961         f->width = f->lbearing + f->rbearing;
2962
2963         return 0;
2964 }
2965
2966 void
2967 xloadfonts(char *fontstr, double fontsize) {
2968         FcPattern *pattern;
2969         FcResult r_sz, r_psz;
2970         double fontval;
2971         float ceilf(float);
2972
2973         if(fontstr[0] == '-') {
2974                 pattern = XftXlfdParse(fontstr, False, False);
2975         } else {
2976                 pattern = FcNameParse((FcChar8 *)fontstr);
2977         }
2978
2979         if(!pattern)
2980                 die("st: can't open font %s\n", fontstr);
2981
2982         if(fontsize > 0) {
2983                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2984                 FcPatternDel(pattern, FC_SIZE);
2985                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2986                 usedfontsize = fontsize;
2987         } else {
2988                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2989                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2990                 if(r_psz == FcResultMatch) {
2991                         usedfontsize = fontval;
2992                 } else if(r_sz == FcResultMatch) {
2993                         usedfontsize = -1;
2994                 } else {
2995                         /*
2996                          * Default font size is 12, if none given. This is to
2997                          * have a known usedfontsize value.
2998                          */
2999                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3000                         usedfontsize = 12;
3001                 }
3002                 defaultfontsize = usedfontsize;
3003         }
3004
3005         FcConfigSubstitute(0, pattern, FcMatchPattern);
3006         FcDefaultSubstitute(pattern);
3007
3008         if(xloadfont(&dc.font, pattern))
3009                 die("st: can't open font %s\n", fontstr);
3010
3011         if(usedfontsize < 0) {
3012                 FcPatternGetDouble(dc.font.match->pattern,
3013                                    FC_PIXEL_SIZE, 0, &fontval);
3014                 usedfontsize = fontval;
3015                 if(fontsize == 0)
3016                         defaultfontsize = fontval;
3017         }
3018
3019         /* Setting character width and height. */
3020         xw.cw = ceilf(dc.font.width * cwscale);
3021         xw.ch = ceilf(dc.font.height * chscale);
3022
3023         FcPatternDel(pattern, FC_SLANT);
3024         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3025         if(xloadfont(&dc.ifont, pattern))
3026                 die("st: can't open font %s\n", fontstr);
3027
3028         FcPatternDel(pattern, FC_WEIGHT);
3029         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3030         if(xloadfont(&dc.ibfont, pattern))
3031                 die("st: can't open font %s\n", fontstr);
3032
3033         FcPatternDel(pattern, FC_SLANT);
3034         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3035         if(xloadfont(&dc.bfont, pattern))
3036                 die("st: can't open font %s\n", fontstr);
3037
3038         FcPatternDestroy(pattern);
3039 }
3040
3041 int
3042 xloadfontset(Font *f) {
3043         FcResult result;
3044
3045         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3046                 return 1;
3047         return 0;
3048 }
3049
3050 void
3051 xunloadfont(Font *f) {
3052         XftFontClose(xw.dpy, f->match);
3053         FcPatternDestroy(f->pattern);
3054         if(f->set)
3055                 FcFontSetDestroy(f->set);
3056 }
3057
3058 void
3059 xunloadfonts(void) {
3060         /* Free the loaded fonts in the font cache.  */
3061         while(frclen > 0)
3062                 XftFontClose(xw.dpy, frc[--frclen].font);
3063
3064         xunloadfont(&dc.font);
3065         xunloadfont(&dc.bfont);
3066         xunloadfont(&dc.ifont);
3067         xunloadfont(&dc.ibfont);
3068 }
3069
3070 void
3071 xzoom(const Arg *arg) {
3072         Arg larg;
3073
3074         larg.i = usedfontsize + arg->i;
3075         xzoomabs(&larg);
3076 }
3077
3078 void
3079 xzoomabs(const Arg *arg) {
3080         xunloadfonts();
3081         xloadfonts(usedfont, arg->i);
3082         cresize(0, 0);
3083         redraw(0);
3084         xhints();
3085 }
3086
3087 void
3088 xzoomreset(const Arg *arg) {
3089         Arg larg;
3090
3091         if(defaultfontsize > 0) {
3092                 larg.i = defaultfontsize;
3093                 xzoomabs(&larg);
3094         }
3095 }
3096
3097 void
3098 xinit(void) {
3099         XGCValues gcvalues;
3100         Cursor cursor;
3101         Window parent;
3102         pid_t thispid = getpid();
3103
3104         if(!(xw.dpy = XOpenDisplay(NULL)))
3105                 die("Can't open display\n");
3106         xw.scr = XDefaultScreen(xw.dpy);
3107         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3108
3109         /* font */
3110         if(!FcInit())
3111                 die("Could not init fontconfig.\n");
3112
3113         usedfont = (opt_font == NULL)? font : opt_font;
3114         xloadfonts(usedfont, 0);
3115
3116         /* colors */
3117         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3118         xloadcols();
3119
3120         /* adjust fixed window geometry */
3121         xw.w = 2 * borderpx + term.col * xw.cw;
3122         xw.h = 2 * borderpx + term.row * xw.ch;
3123         if(xw.gm & XNegative)
3124                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3125         if(xw.gm & YNegative)
3126                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3127
3128         /* Events */
3129         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3130         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3131         xw.attrs.bit_gravity = NorthWestGravity;
3132         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3133                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3134                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3135         xw.attrs.colormap = xw.cmap;
3136
3137         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3138                         XRootWindow(xw.dpy, xw.scr);
3139         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3140                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3141                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3142                         | CWEventMask | CWColormap, &xw.attrs);
3143
3144         memset(&gcvalues, 0, sizeof(gcvalues));
3145         gcvalues.graphics_exposures = False;
3146         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3147                         &gcvalues);
3148         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3149                         DefaultDepth(xw.dpy, xw.scr));
3150         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3151         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3152
3153         /* Xft rendering context */
3154         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3155
3156         /* input methods */
3157         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3158                 XSetLocaleModifiers("@im=local");
3159                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3160                         XSetLocaleModifiers("@im=");
3161                         if((xw.xim = XOpenIM(xw.dpy,
3162                                         NULL, NULL, NULL)) == NULL) {
3163                                 die("XOpenIM failed. Could not open input"
3164                                         " device.\n");
3165                         }
3166                 }
3167         }
3168         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3169                                            | XIMStatusNothing, XNClientWindow, xw.win,
3170                                            XNFocusWindow, xw.win, NULL);
3171         if(xw.xic == NULL)
3172                 die("XCreateIC failed. Could not obtain input method.\n");
3173
3174         /* white cursor, black outline */
3175         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3176         XDefineCursor(xw.dpy, xw.win, cursor);
3177         XRecolorCursor(xw.dpy, cursor,
3178                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3179                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3180
3181         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3182         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3183         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3184         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3185
3186         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3187         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3188                         PropModeReplace, (uchar *)&thispid, 1);
3189
3190         xresettitle();
3191         XMapWindow(xw.dpy, xw.win);
3192         xhints();
3193         XSync(xw.dpy, False);
3194 }
3195
3196 void
3197 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3198         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3199             width = charlen * xw.cw, xp, i;
3200         int frcflags;
3201         int u8fl, u8fblen, u8cblen, doesexist;
3202         char *u8c, *u8fs;
3203         long unicodep;
3204         Font *font = &dc.font;
3205         FcResult fcres;
3206         FcPattern *fcpattern, *fontpattern;
3207         FcFontSet *fcsets[] = { NULL };
3208         FcCharSet *fccharset;
3209         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3210         XRenderColor colfg, colbg;
3211         XRectangle r;
3212         int oneatatime;
3213
3214         frcflags = FRC_NORMAL;
3215
3216         if(base.mode & ATTR_ITALIC) {
3217                 if(base.fg == defaultfg)
3218                         base.fg = defaultitalic;
3219                 font = &dc.ifont;
3220                 frcflags = FRC_ITALIC;
3221         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3222                 if(base.fg == defaultfg)
3223                         base.fg = defaultitalic;
3224                 font = &dc.ibfont;
3225                 frcflags = FRC_ITALICBOLD;
3226         } else if(base.mode & ATTR_UNDERLINE) {
3227                 if(base.fg == defaultfg)
3228                         base.fg = defaultunderline;
3229         }
3230
3231         if(IS_TRUECOL(base.fg)) {
3232                 colfg.alpha = 0xffff;
3233                 colfg.red = TRUERED(base.fg);
3234                 colfg.green = TRUEGREEN(base.fg);
3235                 colfg.blue = TRUEBLUE(base.fg);
3236                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3237                 fg = &truefg;
3238         } else {
3239                 fg = &dc.col[base.fg];
3240         }
3241
3242         if(IS_TRUECOL(base.bg)) {
3243                 colbg.alpha = 0xffff;
3244                 colbg.green = TRUEGREEN(base.bg);
3245                 colbg.red = TRUERED(base.bg);
3246                 colbg.blue = TRUEBLUE(base.bg);
3247                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3248                 bg = &truebg;
3249         } else {
3250                 bg = &dc.col[base.bg];
3251         }
3252
3253         if(base.mode & ATTR_BOLD) {
3254                 /*
3255                  * change basic system colors [0-7]
3256                  * to bright system colors [8-15]
3257                  */
3258                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3259                         fg = &dc.col[base.fg + 8];
3260
3261                 if(base.mode & ATTR_ITALIC) {
3262                         font = &dc.ibfont;
3263                         frcflags = FRC_ITALICBOLD;
3264                 } else {
3265                         font = &dc.bfont;
3266                         frcflags = FRC_BOLD;
3267                 }
3268         }
3269
3270         if(IS_SET(MODE_REVERSE)) {
3271                 if(fg == &dc.col[defaultfg]) {
3272                         fg = &dc.col[defaultbg];
3273                 } else {
3274                         colfg.red = ~fg->color.red;
3275                         colfg.green = ~fg->color.green;
3276                         colfg.blue = ~fg->color.blue;
3277                         colfg.alpha = fg->color.alpha;
3278                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3279                                         &revfg);
3280                         fg = &revfg;
3281                 }
3282
3283                 if(bg == &dc.col[defaultbg]) {
3284                         bg = &dc.col[defaultfg];
3285                 } else {
3286                         colbg.red = ~bg->color.red;
3287                         colbg.green = ~bg->color.green;
3288                         colbg.blue = ~bg->color.blue;
3289                         colbg.alpha = bg->color.alpha;
3290                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3291                                         &revbg);
3292                         bg = &revbg;
3293                 }
3294         }
3295
3296         if(base.mode & ATTR_REVERSE) {
3297                 temp = fg;
3298                 fg = bg;
3299                 bg = temp;
3300         }
3301
3302         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3303                 colfg.red = fg->color.red / 2;
3304                 colfg.green = fg->color.green / 2;
3305                 colfg.blue = fg->color.blue / 2;
3306                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3307                 fg = &revfg;
3308         }
3309
3310         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3311                 fg = bg;
3312
3313         if(base.mode & ATTR_INVISIBLE)
3314                 fg = bg;
3315
3316         /* Intelligent cleaning up of the borders. */
3317         if(x == 0) {
3318                 xclear(0, (y == 0)? 0 : winy, borderpx,
3319                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3320         }
3321         if(x + charlen >= term.col) {
3322                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3323                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3324         }
3325         if(y == 0)
3326                 xclear(winx, 0, winx + width, borderpx);
3327         if(y == term.row-1)
3328                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3329
3330         /* Clean up the region we want to draw to. */
3331         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3332
3333         /* Set the clip region because Xft is sometimes dirty. */
3334         r.x = 0;
3335         r.y = 0;
3336         r.height = xw.ch;
3337         r.width = width;
3338         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3339
3340         for(xp = winx; bytelen > 0;) {
3341                 /*
3342                  * Search for the range in the to be printed string of glyphs
3343                  * that are in the main font. Then print that range. If
3344                  * some glyph is found that is not in the font, do the
3345                  * fallback dance.
3346                  */
3347                 u8fs = s;
3348                 u8fblen = 0;
3349                 u8fl = 0;
3350                 oneatatime = font->width != xw.cw;
3351                 for(;;) {
3352                         u8c = s;
3353                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3354                         s += u8cblen;
3355                         bytelen -= u8cblen;
3356
3357                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3358                         if(doesexist) {
3359                                         u8fl++;
3360                                         u8fblen += u8cblen;
3361                                         if(!oneatatime && bytelen > 0)
3362                                                         continue;
3363                         }
3364
3365                         if(u8fl > 0) {
3366                                 XftDrawStringUtf8(xw.draw, fg,
3367                                                 font->match, xp,
3368                                                 winy + font->ascent,
3369                                                 (FcChar8 *)u8fs,
3370                                                 u8fblen);
3371                                 xp += xw.cw * u8fl;
3372                         }
3373                         break;
3374                 }
3375                 if(doesexist) {
3376                         if(oneatatime)
3377                                 continue;
3378                         break;
3379                 }
3380
3381                 /* Search the font cache. */
3382                 for(i = 0; i < frclen; i++) {
3383                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3384                                         && frc[i].flags == frcflags) {
3385                                 break;
3386                         }
3387                 }
3388
3389                 /* Nothing was found. */
3390                 if(i >= frclen) {
3391                         if(!font->set)
3392                                 xloadfontset(font);
3393                         fcsets[0] = font->set;
3394
3395                         /*
3396                          * Nothing was found in the cache. Now use
3397                          * some dozen of Fontconfig calls to get the
3398                          * font for one single character.
3399                          *
3400                          * Xft and fontconfig are design failures.
3401                          */
3402                         fcpattern = FcPatternDuplicate(font->pattern);
3403                         fccharset = FcCharSetCreate();
3404
3405                         FcCharSetAddChar(fccharset, unicodep);
3406                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3407                                         fccharset);
3408                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3409                                         FcTrue);
3410
3411                         FcConfigSubstitute(0, fcpattern,
3412                                         FcMatchPattern);
3413                         FcDefaultSubstitute(fcpattern);
3414
3415                         fontpattern = FcFontSetMatch(0, fcsets,
3416                                         FcTrue, fcpattern, &fcres);
3417
3418                         /*
3419                          * Overwrite or create the new cache entry.
3420                          */
3421                         if(frclen >= LEN(frc)) {
3422                                 frclen = LEN(frc) - 1;
3423                                 XftFontClose(xw.dpy, frc[frclen].font);
3424                         }
3425
3426                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3427                                         fontpattern);
3428                         frc[frclen].flags = frcflags;
3429
3430                         i = frclen;
3431                         frclen++;
3432
3433                         FcPatternDestroy(fcpattern);
3434                         FcCharSetDestroy(fccharset);
3435                 }
3436
3437                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3438                                 xp, winy + frc[i].font->ascent,
3439                                 (FcChar8 *)u8c, u8cblen);
3440
3441                 xp += xw.cw * wcwidth(unicodep);
3442         }
3443
3444         /*
3445          * This is how the loop above actually should be. Why does the
3446          * application have to care about font details?
3447          *
3448          * I have to repeat: Xft and Fontconfig are design failures.
3449          */
3450         /*
3451         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3452                         winy + font->ascent, (FcChar8 *)s, bytelen);
3453         */
3454
3455         if(base.mode & ATTR_UNDERLINE) {
3456                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3457                                 width, 1);
3458         }
3459
3460         if(base.mode & ATTR_STRUCK) {
3461                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3462                                 width, 1);
3463         }
3464
3465         /* Reset clip to none. */
3466         XftDrawSetClip(xw.draw, 0);
3467 }
3468
3469 void
3470 xdrawcursor(void) {
3471         static int oldx = 0, oldy = 0;
3472         int sl, width, curx;
3473         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3474
3475         LIMIT(oldx, 0, term.col-1);
3476         LIMIT(oldy, 0, term.row-1);
3477
3478         curx = term.c.x;
3479
3480         /* adjust position if in dummy */
3481         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3482                 oldx--;
3483         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3484                 curx--;
3485
3486         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3487
3488         /* remove the old cursor */
3489         sl = utf8len(term.line[oldy][oldx].c);
3490         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3491         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3492                         oldy, width, sl);
3493
3494         if(IS_SET(MODE_HIDE))
3495                 return;
3496
3497         /* draw the new one */
3498         if(xw.state & WIN_FOCUSED) {
3499                 if(IS_SET(MODE_REVERSE)) {
3500                         g.mode |= ATTR_REVERSE;
3501                         g.fg = defaultcs;
3502                         g.bg = defaultfg;
3503                 }
3504
3505                 sl = utf8len(g.c);
3506                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3507                         ? 2 : 1;
3508                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3509         } else {
3510                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3511                                 borderpx + curx * xw.cw,
3512                                 borderpx + term.c.y * xw.ch,
3513                                 xw.cw - 1, 1);
3514                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3515                                 borderpx + curx * xw.cw,
3516                                 borderpx + term.c.y * xw.ch,
3517                                 1, xw.ch - 1);
3518                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3519                                 borderpx + (curx + 1) * xw.cw - 1,
3520                                 borderpx + term.c.y * xw.ch,
3521                                 1, xw.ch - 1);
3522                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3523                                 borderpx + curx * xw.cw,
3524                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3525                                 xw.cw, 1);
3526         }
3527         oldx = curx, oldy = term.c.y;
3528 }
3529
3530
3531 void
3532 xsettitle(char *p) {
3533         XTextProperty prop;
3534
3535         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3536                         &prop);
3537         XSetWMName(xw.dpy, xw.win, &prop);
3538         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3539         XFree(prop.value);
3540 }
3541
3542 void
3543 xresettitle(void) {
3544         xsettitle(opt_title ? opt_title : "st");
3545 }
3546
3547 void
3548 redraw(int timeout) {
3549         struct timespec tv = {0, timeout * 1000};
3550
3551         tfulldirt();
3552         draw();
3553
3554         if(timeout > 0) {
3555                 nanosleep(&tv, NULL);
3556                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3557         }
3558 }
3559
3560 void
3561 draw(void) {
3562         drawregion(0, 0, term.col, term.row);
3563         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3564                         xw.h, 0, 0);
3565         XSetForeground(xw.dpy, dc.gc,
3566                         dc.col[IS_SET(MODE_REVERSE)?
3567                                 defaultfg : defaultbg].pixel);
3568 }
3569
3570 void
3571 drawregion(int x1, int y1, int x2, int y2) {
3572         int ic, ib, x, y, ox, sl;
3573         Glyph base, new;
3574         char buf[DRAW_BUF_SIZ];
3575         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3576         long unicodep;
3577
3578         if(!(xw.state & WIN_VISIBLE))
3579                 return;
3580
3581         for(y = y1; y < y2; y++) {
3582                 if(!term.dirty[y])
3583                         continue;
3584
3585                 xtermclear(0, y, term.col, y);
3586                 term.dirty[y] = 0;
3587                 base = term.line[y][0];
3588                 ic = ib = ox = 0;
3589                 for(x = x1; x < x2; x++) {
3590                         new = term.line[y][x];
3591                         if(new.mode == ATTR_WDUMMY)
3592                                 continue;
3593                         if(ena_sel && selected(x, y))
3594                                 new.mode ^= ATTR_REVERSE;
3595                         if(ib > 0 && (ATTRCMP(base, new)
3596                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3597                                 xdraws(buf, base, ox, y, ic, ib);
3598                                 ic = ib = 0;
3599                         }
3600                         if(ib == 0) {
3601                                 ox = x;
3602                                 base = new;
3603                         }
3604
3605                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3606                         memcpy(buf+ib, new.c, sl);
3607                         ib += sl;
3608                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3609                 }
3610                 if(ib > 0)
3611                         xdraws(buf, base, ox, y, ic, ib);
3612         }
3613         xdrawcursor();
3614 }
3615
3616 void
3617 expose(XEvent *ev) {
3618         XExposeEvent *e = &ev->xexpose;
3619
3620         if(xw.state & WIN_REDRAW) {
3621                 if(!e->count)
3622                         xw.state &= ~WIN_REDRAW;
3623         }
3624         redraw(0);
3625 }
3626
3627 void
3628 visibility(XEvent *ev) {
3629         XVisibilityEvent *e = &ev->xvisibility;
3630
3631         if(e->state == VisibilityFullyObscured) {
3632                 xw.state &= ~WIN_VISIBLE;
3633         } else if(!(xw.state & WIN_VISIBLE)) {
3634                 /* need a full redraw for next Expose, not just a buf copy */
3635                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3636         }
3637 }
3638
3639 void
3640 unmap(XEvent *ev) {
3641         xw.state &= ~WIN_VISIBLE;
3642 }
3643
3644 void
3645 xsetpointermotion(int set) {
3646         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3647         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3648 }
3649
3650 void
3651 xseturgency(int add) {
3652         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3653
3654         MODBIT(h->flags, add, XUrgencyHint);
3655         XSetWMHints(xw.dpy, xw.win, h);
3656         XFree(h);
3657 }
3658
3659 void
3660 focus(XEvent *ev) {
3661         XFocusChangeEvent *e = &ev->xfocus;
3662
3663         if(e->mode == NotifyGrab)
3664                 return;
3665
3666         if(ev->type == FocusIn) {
3667                 XSetICFocus(xw.xic);
3668                 xw.state |= WIN_FOCUSED;
3669                 xseturgency(0);
3670                 if(IS_SET(MODE_FOCUS))
3671                         ttywrite("\033[I", 3);
3672         } else {
3673                 XUnsetICFocus(xw.xic);
3674                 xw.state &= ~WIN_FOCUSED;
3675                 if(IS_SET(MODE_FOCUS))
3676                         ttywrite("\033[O", 3);
3677         }
3678 }
3679
3680 static inline bool
3681 match(uint mask, uint state) {
3682         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3683 }
3684
3685 void
3686 numlock(const Arg *dummy) {
3687         term.numlock ^= 1;
3688 }
3689
3690 char*
3691 kmap(KeySym k, uint state) {
3692         Key *kp;
3693         int i;
3694
3695         /* Check for mapped keys out of X11 function keys. */
3696         for(i = 0; i < LEN(mappedkeys); i++) {
3697                 if(mappedkeys[i] == k)
3698                         break;
3699         }
3700         if(i == LEN(mappedkeys)) {
3701                 if((k & 0xFFFF) < 0xFD00)
3702                         return NULL;
3703         }
3704
3705         for(kp = key; kp < key + LEN(key); kp++) {
3706                 if(kp->k != k)
3707                         continue;
3708
3709                 if(!match(kp->mask, state))
3710                         continue;
3711
3712                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3713                         continue;
3714                 if(term.numlock && kp->appkey == 2)
3715                         continue;
3716
3717                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3718                         continue;
3719
3720                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3721                         continue;
3722
3723                 return kp->s;
3724         }
3725
3726         return NULL;
3727 }
3728
3729 void
3730 kpress(XEvent *ev) {
3731         XKeyEvent *e = &ev->xkey;
3732         KeySym ksym;
3733         char buf[32], *customkey;
3734         int len;
3735         long c;
3736         Status status;
3737         Shortcut *bp;
3738
3739         if(IS_SET(MODE_KBDLOCK))
3740                 return;
3741
3742         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3743         /* 1. shortcuts */
3744         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3745                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3746                         bp->func(&(bp->arg));
3747                         return;
3748                 }
3749         }
3750
3751         /* 2. custom keys from config.h */
3752         if((customkey = kmap(ksym, e->state))) {
3753                 ttysend(customkey, strlen(customkey));
3754                 return;
3755         }
3756
3757         /* 3. composed string from input method */
3758         if(len == 0)
3759                 return;
3760         if(len == 1 && e->state & Mod1Mask) {
3761                 if(IS_SET(MODE_8BIT)) {
3762                         if(*buf < 0177) {
3763                                 c = *buf | 0x80;
3764                                 len = utf8encode(c, buf, UTF_SIZ);
3765                         }
3766                 } else {
3767                         buf[1] = buf[0];
3768                         buf[0] = '\033';
3769                         len = 2;
3770                 }
3771         }
3772         ttysend(buf, len);
3773 }
3774
3775
3776 void
3777 cmessage(XEvent *e) {
3778         /*
3779          * See xembed specs
3780          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3781          */
3782         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3783                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3784                         xw.state |= WIN_FOCUSED;
3785                         xseturgency(0);
3786                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3787                         xw.state &= ~WIN_FOCUSED;
3788                 }
3789         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3790                 /* Send SIGHUP to shell */
3791                 kill(pid, SIGHUP);
3792                 exit(EXIT_SUCCESS);
3793         }
3794 }
3795
3796 void
3797 cresize(int width, int height) {
3798         int col, row;
3799
3800         if(width != 0)
3801                 xw.w = width;
3802         if(height != 0)
3803                 xw.h = height;
3804
3805         col = (xw.w - 2 * borderpx) / xw.cw;
3806         row = (xw.h - 2 * borderpx) / xw.ch;
3807
3808         tresize(col, row);
3809         xresize(col, row);
3810         ttyresize();
3811 }
3812
3813 void
3814 resize(XEvent *e) {
3815         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3816                 return;
3817
3818         cresize(e->xconfigure.width, e->xconfigure.height);
3819 }
3820
3821 void
3822 run(void) {
3823         XEvent ev;
3824         int w = xw.w, h = xw.h;
3825         fd_set rfd;
3826         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3827         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3828         long deltatime;
3829
3830         /* Waiting for window mapping */
3831         while(1) {
3832                 XNextEvent(xw.dpy, &ev);
3833                 if(XFilterEvent(&ev, None))
3834                         continue;
3835                 if(ev.type == ConfigureNotify) {
3836                         w = ev.xconfigure.width;
3837                         h = ev.xconfigure.height;
3838                 } else if(ev.type == MapNotify) {
3839                         break;
3840                 }
3841         }
3842
3843         ttynew();
3844         cresize(w, h);
3845
3846         clock_gettime(CLOCK_MONOTONIC, &last);
3847         lastblink = last;
3848
3849         for(xev = actionfps;;) {
3850                 FD_ZERO(&rfd);
3851                 FD_SET(cmdfd, &rfd);
3852                 FD_SET(xfd, &rfd);
3853
3854                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3855                         if(errno == EINTR)
3856                                 continue;
3857                         die("select failed: %s\n", strerror(errno));
3858                 }
3859                 if(FD_ISSET(cmdfd, &rfd)) {
3860                         ttyread();
3861                         if(blinktimeout) {
3862                                 blinkset = tattrset(ATTR_BLINK);
3863                                 if(!blinkset)
3864                                         MODBIT(term.mode, 0, MODE_BLINK);
3865                         }
3866                 }
3867
3868                 if(FD_ISSET(xfd, &rfd))
3869                         xev = actionfps;
3870
3871                 clock_gettime(CLOCK_MONOTONIC, &now);
3872                 drawtimeout.tv_sec = 0;
3873                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3874                 tv = &drawtimeout;
3875
3876                 dodraw = 0;
3877                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3878                         tsetdirtattr(ATTR_BLINK);
3879                         term.mode ^= MODE_BLINK;
3880                         lastblink = now;
3881                         dodraw = 1;
3882                 }
3883                 deltatime = TIMEDIFF(now, last);
3884                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3885                                 || deltatime < 0) {
3886                         dodraw = 1;
3887                         last = now;
3888                 }
3889
3890                 if(dodraw) {
3891                         while(XPending(xw.dpy)) {
3892                                 XNextEvent(xw.dpy, &ev);
3893                                 if(XFilterEvent(&ev, None))
3894                                         continue;
3895                                 if(handler[ev.type])
3896                                         (handler[ev.type])(&ev);
3897                         }
3898
3899                         draw();
3900                         XFlush(xw.dpy);
3901
3902                         if(xev && !FD_ISSET(xfd, &rfd))
3903                                 xev--;
3904                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3905                                 if(blinkset) {
3906                                         if(TIMEDIFF(now, lastblink) \
3907                                                         > blinktimeout) {
3908                                                 drawtimeout.tv_nsec = 1000;
3909                                         } else {
3910                                                 drawtimeout.tv_nsec = (1E6 * \
3911                                                         (blinktimeout - \
3912                                                         TIMEDIFF(now,
3913                                                                 lastblink)));
3914                                         }
3915                                 } else {
3916                                         tv = NULL;
3917                                 }
3918                         }
3919                 }
3920         }
3921 }
3922
3923 void
3924 usage(void) {
3925         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3926         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3927         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3928 }
3929
3930 int
3931 main(int argc, char *argv[]) {
3932         char *titles;
3933         uint cols = 80, rows = 24;
3934
3935         xw.l = xw.t = 0;
3936         xw.isfixed = False;
3937
3938         ARGBEGIN {
3939         case 'a':
3940                 allowaltscreen = false;
3941                 break;
3942         case 'c':
3943                 opt_class = EARGF(usage());
3944                 break;
3945         case 'e':
3946                 /* eat all remaining arguments */
3947                 if(argc > 1) {
3948                         opt_cmd = &argv[1];
3949                         if(argv[1] != NULL && opt_title == NULL) {
3950                                 titles = xstrdup(argv[1]);
3951                                 opt_title = basename(titles);
3952                         }
3953                 }
3954                 goto run;
3955         case 'f':
3956                 opt_font = EARGF(usage());
3957                 break;
3958         case 'g':
3959                 xw.gm = XParseGeometry(EARGF(usage()),
3960                                 &xw.l, &xw.t, &cols, &rows);
3961                 break;
3962         case 'i':
3963                 xw.isfixed = True;
3964                 break;
3965         case 'o':
3966                 opt_io = EARGF(usage());
3967                 break;
3968         case 't':
3969                 opt_title = EARGF(usage());
3970                 break;
3971         case 'w':
3972                 opt_embed = EARGF(usage());
3973                 break;
3974         case 'v':
3975         default:
3976                 usage();
3977         } ARGEND;
3978
3979 run:
3980         setlocale(LC_CTYPE, "");
3981         XSetLocaleModifiers("");
3982         tnew(cols? cols : 1, rows? rows : 1);
3983         xinit();
3984         selinit();
3985         run();
3986
3987         return 0;
3988 }
3989