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, *prog;
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         sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1162         if(opt_cmd)
1163                 prog = opt_cmd[0];
1164         else if(utmp)
1165                 prog = utmp;
1166         else
1167                 prog = sh;
1168         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1169
1170         snprintf(buf, sizeof(buf), "%lu", xw.win);
1171
1172         unsetenv("COLUMNS");
1173         unsetenv("LINES");
1174         unsetenv("TERMCAP");
1175         setenv("LOGNAME", pw->pw_name, 1);
1176         setenv("USER", pw->pw_name, 1);
1177         setenv("SHELL", sh, 1);
1178         setenv("HOME", pw->pw_dir, 1);
1179         setenv("TERM", termname, 1);
1180         setenv("WINDOWID", buf, 1);
1181
1182         signal(SIGCHLD, SIG_DFL);
1183         signal(SIGHUP, SIG_DFL);
1184         signal(SIGINT, SIG_DFL);
1185         signal(SIGQUIT, SIG_DFL);
1186         signal(SIGTERM, SIG_DFL);
1187         signal(SIGALRM, SIG_DFL);
1188
1189         execvp(prog, args);
1190         exit(EXIT_FAILURE);
1191 }
1192
1193 void
1194 sigchld(int a) {
1195         int stat, ret;
1196
1197         if(waitpid(pid, &stat, 0) < 0)
1198                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1199
1200         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1201         if (ret != EXIT_SUCCESS)
1202                 die("child finished with error '%d'\n", stat);
1203         exit(EXIT_SUCCESS);
1204 }
1205
1206 void
1207 ttynew(void) {
1208         int m, s;
1209         struct winsize w = {term.row, term.col, 0, 0};
1210
1211         /* seems to work fine on linux, openbsd and freebsd */
1212         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1213                 die("openpty failed: %s\n", strerror(errno));
1214
1215         switch(pid = fork()) {
1216         case -1:
1217                 die("fork failed\n");
1218                 break;
1219         case 0:
1220                 setsid(); /* create a new process group */
1221                 dup2(s, STDIN_FILENO);
1222                 dup2(s, STDOUT_FILENO);
1223                 dup2(s, STDERR_FILENO);
1224                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1225                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1226                 close(s);
1227                 close(m);
1228                 execsh();
1229                 break;
1230         default:
1231                 close(s);
1232                 cmdfd = m;
1233                 signal(SIGCHLD, sigchld);
1234                 if(opt_io) {
1235                         term.mode |= MODE_PRINT;
1236                         iofd = (!strcmp(opt_io, "-")) ?
1237                                   STDOUT_FILENO :
1238                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1239                         if(iofd < 0) {
1240                                 fprintf(stderr, "Error opening %s:%s\n",
1241                                         opt_io, strerror(errno));
1242                         }
1243                 }
1244                 break;
1245         }
1246 }
1247
1248 void
1249 ttyread(void) {
1250         static char buf[BUFSIZ];
1251         static int buflen = 0;
1252         char *ptr;
1253         char s[UTF_SIZ];
1254         int charsize; /* size of utf8 char in bytes */
1255         long unicodep;
1256         int ret;
1257
1258         /* append read bytes to unprocessed bytes */
1259         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1260                 die("Couldn't read from shell: %s\n", strerror(errno));
1261
1262         /* process every complete utf8 char */
1263         buflen += ret;
1264         ptr = buf;
1265         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1266                 utf8encode(unicodep, s, UTF_SIZ);
1267                 tputc(s, charsize);
1268                 ptr += charsize;
1269                 buflen -= charsize;
1270         }
1271
1272         /* keep any uncomplete utf8 char for the next call */
1273         memmove(buf, ptr, buflen);
1274 }
1275
1276 void
1277 ttywrite(const char *s, size_t n) {
1278         if(xwrite(cmdfd, s, n) == -1)
1279                 die("write error on tty: %s\n", strerror(errno));
1280 }
1281
1282 void
1283 ttysend(char *s, size_t n) {
1284         ttywrite(s, n);
1285         if(IS_SET(MODE_ECHO))
1286                 techo(s, n);
1287 }
1288
1289 void
1290 ttyresize(void) {
1291         struct winsize w;
1292
1293         w.ws_row = term.row;
1294         w.ws_col = term.col;
1295         w.ws_xpixel = xw.tw;
1296         w.ws_ypixel = xw.th;
1297         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1298                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1299 }
1300
1301 int
1302 tattrset(int attr) {
1303         int i, j;
1304
1305         for(i = 0; i < term.row-1; i++) {
1306                 for(j = 0; j < term.col-1; j++) {
1307                         if(term.line[i][j].mode & attr)
1308                                 return 1;
1309                 }
1310         }
1311
1312         return 0;
1313 }
1314
1315 void
1316 tsetdirt(int top, int bot) {
1317         int i;
1318
1319         LIMIT(top, 0, term.row-1);
1320         LIMIT(bot, 0, term.row-1);
1321
1322         for(i = top; i <= bot; i++)
1323                 term.dirty[i] = 1;
1324 }
1325
1326 void
1327 tsetdirtattr(int attr) {
1328         int i, j;
1329
1330         for(i = 0; i < term.row-1; i++) {
1331                 for(j = 0; j < term.col-1; j++) {
1332                         if(term.line[i][j].mode & attr) {
1333                                 tsetdirt(i, i);
1334                                 break;
1335                         }
1336                 }
1337         }
1338 }
1339
1340 void
1341 tfulldirt(void) {
1342         tsetdirt(0, term.row-1);
1343 }
1344
1345 void
1346 tcursor(int mode) {
1347         static TCursor c[2];
1348         bool alt = IS_SET(MODE_ALTSCREEN);
1349
1350         if(mode == CURSOR_SAVE) {
1351                 c[alt] = term.c;
1352         } else if(mode == CURSOR_LOAD) {
1353                 term.c = c[alt];
1354                 tmoveto(c[alt].x, c[alt].y);
1355         }
1356 }
1357
1358 void
1359 treset(void) {
1360         uint i;
1361
1362         term.c = (TCursor){{
1363                 .mode = ATTR_NULL,
1364                 .fg = defaultfg,
1365                 .bg = defaultbg
1366         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1367
1368         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1369         for(i = tabspaces; i < term.col; i += tabspaces)
1370                 term.tabs[i] = 1;
1371         term.top = 0;
1372         term.bot = term.row - 1;
1373         term.mode = MODE_WRAP;
1374         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1375         term.charset = 0;
1376
1377         for(i = 0; i < 2; i++) {
1378                 tmoveto(0, 0);
1379                 tcursor(CURSOR_SAVE);
1380                 tclearregion(0, 0, term.col-1, term.row-1);
1381                 tswapscreen();
1382         }
1383 }
1384
1385 void
1386 tnew(int col, int row) {
1387         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1388         tresize(col, row);
1389         term.numlock = 1;
1390
1391         treset();
1392 }
1393
1394 void
1395 tswapscreen(void) {
1396         Line *tmp = term.line;
1397
1398         term.line = term.alt;
1399         term.alt = tmp;
1400         term.mode ^= MODE_ALTSCREEN;
1401         tfulldirt();
1402 }
1403
1404 void
1405 tscrolldown(int orig, int n) {
1406         int i;
1407         Line temp;
1408
1409         LIMIT(n, 0, term.bot-orig+1);
1410
1411         tsetdirt(orig, term.bot-n);
1412         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1413
1414         for(i = term.bot; i >= orig+n; i--) {
1415                 temp = term.line[i];
1416                 term.line[i] = term.line[i-n];
1417                 term.line[i-n] = temp;
1418         }
1419
1420         selscroll(orig, n);
1421 }
1422
1423 void
1424 tscrollup(int orig, int n) {
1425         int i;
1426         Line temp;
1427
1428         LIMIT(n, 0, term.bot-orig+1);
1429
1430         tclearregion(0, orig, term.col-1, orig+n-1);
1431         tsetdirt(orig+n, term.bot);
1432
1433         for(i = orig; i <= term.bot-n; i++) {
1434                 temp = term.line[i];
1435                 term.line[i] = term.line[i+n];
1436                 term.line[i+n] = temp;
1437         }
1438
1439         selscroll(orig, -n);
1440 }
1441
1442 void
1443 selscroll(int orig, int n) {
1444         if(sel.ob.x == -1)
1445                 return;
1446
1447         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1448                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1449                         selclear(NULL);
1450                         return;
1451                 }
1452                 if(sel.type == SEL_RECTANGULAR) {
1453                         if(sel.ob.y < term.top)
1454                                 sel.ob.y = term.top;
1455                         if(sel.oe.y > term.bot)
1456                                 sel.oe.y = term.bot;
1457                 } else {
1458                         if(sel.ob.y < term.top) {
1459                                 sel.ob.y = term.top;
1460                                 sel.ob.x = 0;
1461                         }
1462                         if(sel.oe.y > term.bot) {
1463                                 sel.oe.y = term.bot;
1464                                 sel.oe.x = term.col;
1465                         }
1466                 }
1467                 selnormalize();
1468         }
1469 }
1470
1471 void
1472 tnewline(int first_col) {
1473         int y = term.c.y;
1474
1475         if(y == term.bot) {
1476                 tscrollup(term.top, 1);
1477         } else {
1478                 y++;
1479         }
1480         tmoveto(first_col ? 0 : term.c.x, y);
1481 }
1482
1483 void
1484 csiparse(void) {
1485         char *p = csiescseq.buf, *np;
1486         long int v;
1487
1488         csiescseq.narg = 0;
1489         if(*p == '?') {
1490                 csiescseq.priv = 1;
1491                 p++;
1492         }
1493
1494         csiescseq.buf[csiescseq.len] = '\0';
1495         while(p < csiescseq.buf+csiescseq.len) {
1496                 np = NULL;
1497                 v = strtol(p, &np, 10);
1498                 if(np == p)
1499                         v = 0;
1500                 if(v == LONG_MAX || v == LONG_MIN)
1501                         v = -1;
1502                 csiescseq.arg[csiescseq.narg++] = v;
1503                 p = np;
1504                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1505                         break;
1506                 p++;
1507         }
1508         csiescseq.mode = *p;
1509 }
1510
1511 /* for absolute user moves, when decom is set */
1512 void
1513 tmoveato(int x, int y) {
1514         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1515 }
1516
1517 void
1518 tmoveto(int x, int y) {
1519         int miny, maxy;
1520
1521         if(term.c.state & CURSOR_ORIGIN) {
1522                 miny = term.top;
1523                 maxy = term.bot;
1524         } else {
1525                 miny = 0;
1526                 maxy = term.row - 1;
1527         }
1528         LIMIT(x, 0, term.col-1);
1529         LIMIT(y, miny, maxy);
1530         term.c.state &= ~CURSOR_WRAPNEXT;
1531         term.c.x = x;
1532         term.c.y = y;
1533 }
1534
1535 void
1536 tsetchar(char *c, Glyph *attr, int x, int y) {
1537         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1538                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1539                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1540                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1541                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1542                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1543                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1544                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1545                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1546         };
1547
1548         /*
1549          * The table is proudly stolen from rxvt.
1550          */
1551         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1552                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1553                         c = vt100_0[c[0] - 0x41];
1554                 }
1555         }
1556
1557         if(term.line[y][x].mode & ATTR_WIDE) {
1558                 if(x+1 < term.col) {
1559                         term.line[y][x+1].c[0] = ' ';
1560                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1561                 }
1562         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1563                 term.line[y][x-1].c[0] = ' ';
1564                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1565         }
1566
1567         term.dirty[y] = 1;
1568         term.line[y][x] = *attr;
1569         memcpy(term.line[y][x].c, c, UTF_SIZ);
1570 }
1571
1572 void
1573 tclearregion(int x1, int y1, int x2, int y2) {
1574         int x, y, temp;
1575         Glyph *gp;
1576
1577         if(x1 > x2)
1578                 temp = x1, x1 = x2, x2 = temp;
1579         if(y1 > y2)
1580                 temp = y1, y1 = y2, y2 = temp;
1581
1582         LIMIT(x1, 0, term.col-1);
1583         LIMIT(x2, 0, term.col-1);
1584         LIMIT(y1, 0, term.row-1);
1585         LIMIT(y2, 0, term.row-1);
1586
1587         for(y = y1; y <= y2; y++) {
1588                 term.dirty[y] = 1;
1589                 for(x = x1; x <= x2; x++) {
1590                         gp = &term.line[y][x];
1591                         if(selected(x, y))
1592                                 selclear(NULL);
1593                         gp->fg = term.c.attr.fg;
1594                         gp->bg = term.c.attr.bg;
1595                         gp->mode = 0;
1596                         memcpy(gp->c, " ", 2);
1597                 }
1598         }
1599 }
1600
1601 void
1602 tdeletechar(int n) {
1603         int dst, src, size;
1604         Glyph *line;
1605
1606         LIMIT(n, 0, term.col - term.c.x);
1607
1608         dst = term.c.x;
1609         src = term.c.x + n;
1610         size = term.col - src;
1611         line = term.line[term.c.y];
1612
1613         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1614         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1615 }
1616
1617 void
1618 tinsertblank(int n) {
1619         int dst, src, size;
1620         Glyph *line;
1621
1622         LIMIT(n, 0, term.col - term.c.x);
1623
1624         dst = term.c.x + n;
1625         src = term.c.x;
1626         size = term.col - dst;
1627         line = term.line[term.c.y];
1628
1629         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1630         tclearregion(src, term.c.y, dst - 1, term.c.y);
1631 }
1632
1633 void
1634 tinsertblankline(int n) {
1635         if(BETWEEN(term.c.y, term.top, term.bot))
1636                 tscrolldown(term.c.y, n);
1637 }
1638
1639 void
1640 tdeleteline(int n) {
1641         if(BETWEEN(term.c.y, term.top, term.bot))
1642                 tscrollup(term.c.y, n);
1643 }
1644
1645 int32_t
1646 tdefcolor(int *attr, int *npar, int l) {
1647         int32_t idx = -1;
1648         uint r, g, b;
1649
1650         switch (attr[*npar + 1]) {
1651         case 2: /* direct color in RGB space */
1652                 if (*npar + 4 >= l) {
1653                         fprintf(stderr,
1654                                 "erresc(38): Incorrect number of parameters (%d)\n",
1655                                 *npar);
1656                         break;
1657                 }
1658                 r = attr[*npar + 2];
1659                 g = attr[*npar + 3];
1660                 b = attr[*npar + 4];
1661                 *npar += 4;
1662                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1663                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1664                                 r, g, b);
1665                 else
1666                         idx = TRUECOLOR(r, g, b);
1667                 break;
1668         case 5: /* indexed color */
1669                 if (*npar + 2 >= l) {
1670                         fprintf(stderr,
1671                                 "erresc(38): Incorrect number of parameters (%d)\n",
1672                                 *npar);
1673                         break;
1674                 }
1675                 *npar += 2;
1676                 if(!BETWEEN(attr[*npar], 0, 255))
1677                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1678                 else
1679                         idx = attr[*npar];
1680                 break;
1681         case 0: /* implemented defined (only foreground) */
1682         case 1: /* transparent */
1683         case 3: /* direct color in CMY space */
1684         case 4: /* direct color in CMYK space */
1685         default:
1686                 fprintf(stderr,
1687                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1688                 break;
1689         }
1690
1691         return idx;
1692 }
1693
1694 void
1695 tsetattr(int *attr, int l) {
1696         int i;
1697         int32_t idx;
1698
1699         for(i = 0; i < l; i++) {
1700                 switch(attr[i]) {
1701                 case 0:
1702                         term.c.attr.mode &= ~(
1703                                 ATTR_BOLD       |
1704                                 ATTR_FAINT      |
1705                                 ATTR_ITALIC     |
1706                                 ATTR_UNDERLINE  |
1707                                 ATTR_BLINK      |
1708                                 ATTR_REVERSE    |
1709                                 ATTR_INVISIBLE  |
1710                                 ATTR_STRUCK     );
1711                         term.c.attr.fg = defaultfg;
1712                         term.c.attr.bg = defaultbg;
1713                         break;
1714                 case 1:
1715                         term.c.attr.mode |= ATTR_BOLD;
1716                         break;
1717                 case 2:
1718                         term.c.attr.mode |= ATTR_FAINT;
1719                         break;
1720                 case 3:
1721                         term.c.attr.mode |= ATTR_ITALIC;
1722                         break;
1723                 case 4:
1724                         term.c.attr.mode |= ATTR_UNDERLINE;
1725                         break;
1726                 case 5: /* slow blink */
1727                         /* FALLTHROUGH */
1728                 case 6: /* rapid blink */
1729                         term.c.attr.mode |= ATTR_BLINK;
1730                         break;
1731                 case 7:
1732                         term.c.attr.mode |= ATTR_REVERSE;
1733                         break;
1734                 case 8:
1735                         term.c.attr.mode |= ATTR_INVISIBLE;
1736                         break;
1737                 case 9:
1738                         term.c.attr.mode |= ATTR_STRUCK;
1739                         break;
1740                 case 22:
1741                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1742                         break;
1743                 case 23:
1744                         term.c.attr.mode &= ~ATTR_ITALIC;
1745                         break;
1746                 case 24:
1747                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1748                         break;
1749                 case 25:
1750                         term.c.attr.mode &= ~ATTR_BLINK;
1751                         break;
1752                 case 27:
1753                         term.c.attr.mode &= ~ATTR_REVERSE;
1754                         break;
1755                 case 28:
1756                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1757                         break;
1758                 case 29:
1759                         term.c.attr.mode &= ~ATTR_STRUCK;
1760                         break;
1761                 case 38:
1762                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1763                                 term.c.attr.fg = idx;
1764                         break;
1765                 case 39:
1766                         term.c.attr.fg = defaultfg;
1767                         break;
1768                 case 48:
1769                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1770                                 term.c.attr.bg = idx;
1771                         break;
1772                 case 49:
1773                         term.c.attr.bg = defaultbg;
1774                         break;
1775                 default:
1776                         if(BETWEEN(attr[i], 30, 37)) {
1777                                 term.c.attr.fg = attr[i] - 30;
1778                         } else if(BETWEEN(attr[i], 40, 47)) {
1779                                 term.c.attr.bg = attr[i] - 40;
1780                         } else if(BETWEEN(attr[i], 90, 97)) {
1781                                 term.c.attr.fg = attr[i] - 90 + 8;
1782                         } else if(BETWEEN(attr[i], 100, 107)) {
1783                                 term.c.attr.bg = attr[i] - 100 + 8;
1784                         } else {
1785                                 fprintf(stderr,
1786                                         "erresc(default): gfx attr %d unknown\n",
1787                                         attr[i]), csidump();
1788                         }
1789                         break;
1790                 }
1791         }
1792 }
1793
1794 void
1795 tsetscroll(int t, int b) {
1796         int temp;
1797
1798         LIMIT(t, 0, term.row-1);
1799         LIMIT(b, 0, term.row-1);
1800         if(t > b) {
1801                 temp = t;
1802                 t = b;
1803                 b = temp;
1804         }
1805         term.top = t;
1806         term.bot = b;
1807 }
1808
1809 void
1810 tsetmode(bool priv, bool set, int *args, int narg) {
1811         int *lim, mode;
1812         bool alt;
1813
1814         for(lim = args + narg; args < lim; ++args) {
1815                 if(priv) {
1816                         switch(*args) {
1817                         case 1: /* DECCKM -- Cursor key */
1818                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1819                                 break;
1820                         case 5: /* DECSCNM -- Reverse video */
1821                                 mode = term.mode;
1822                                 MODBIT(term.mode, set, MODE_REVERSE);
1823                                 if(mode != term.mode)
1824                                         redraw(REDRAW_TIMEOUT);
1825                                 break;
1826                         case 6: /* DECOM -- Origin */
1827                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1828                                 tmoveato(0, 0);
1829                                 break;
1830                         case 7: /* DECAWM -- Auto wrap */
1831                                 MODBIT(term.mode, set, MODE_WRAP);
1832                                 break;
1833                         case 0:  /* Error (IGNORED) */
1834                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1835                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1836                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1837                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1838                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1839                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1840                         case 42: /* DECNRCM -- National characters (IGNORED) */
1841                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1842                                 break;
1843                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1844                                 MODBIT(term.mode, !set, MODE_HIDE);
1845                                 break;
1846                         case 9:    /* X10 mouse compatibility mode */
1847                                 xsetpointermotion(0);
1848                                 MODBIT(term.mode, 0, MODE_MOUSE);
1849                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1850                                 break;
1851                         case 1000: /* 1000: report button press */
1852                                 xsetpointermotion(0);
1853                                 MODBIT(term.mode, 0, MODE_MOUSE);
1854                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1855                                 break;
1856                         case 1002: /* 1002: report motion on button press */
1857                                 xsetpointermotion(0);
1858                                 MODBIT(term.mode, 0, MODE_MOUSE);
1859                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1860                                 break;
1861                         case 1003: /* 1003: enable all mouse motions */
1862                                 xsetpointermotion(set);
1863                                 MODBIT(term.mode, 0, MODE_MOUSE);
1864                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1865                                 break;
1866                         case 1004: /* 1004: send focus events to tty */
1867                                 MODBIT(term.mode, set, MODE_FOCUS);
1868                                 break;
1869                         case 1006: /* 1006: extended reporting mode */
1870                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1871                                 break;
1872                         case 1034:
1873                                 MODBIT(term.mode, set, MODE_8BIT);
1874                                 break;
1875                         case 1049: /* swap screen & set/restore cursor as xterm */
1876                                 if (!allowaltscreen)
1877                                         break;
1878                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1879                                 /* FALLTHROUGH */
1880                         case 47: /* swap screen */
1881                         case 1047:
1882                                 if (!allowaltscreen)
1883                                         break;
1884                                 alt = IS_SET(MODE_ALTSCREEN);
1885                                 if(alt) {
1886                                         tclearregion(0, 0, term.col-1,
1887                                                         term.row-1);
1888                                 }
1889                                 if(set ^ alt) /* set is always 1 or 0 */
1890                                         tswapscreen();
1891                                 if(*args != 1049)
1892                                         break;
1893                                 /* FALLTHROUGH */
1894                         case 1048:
1895                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1896                                 break;
1897                         case 2004: /* 2004: bracketed paste mode */
1898                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1899                                 break;
1900                         /* Not implemented mouse modes. See comments there. */
1901                         case 1001: /* mouse highlight mode; can hang the
1902                                       terminal by design when implemented. */
1903                         case 1005: /* UTF-8 mouse mode; will confuse
1904                                       applications not supporting UTF-8
1905                                       and luit. */
1906                         case 1015: /* urxvt mangled mouse mode; incompatible
1907                                       and can be mistaken for other control
1908                                       codes. */
1909                         default:
1910                                 fprintf(stderr,
1911                                         "erresc: unknown private set/reset mode %d\n",
1912                                         *args);
1913                                 break;
1914                         }
1915                 } else {
1916                         switch(*args) {
1917                         case 0:  /* Error (IGNORED) */
1918                                 break;
1919                         case 2:  /* KAM -- keyboard action */
1920                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1921                                 break;
1922                         case 4:  /* IRM -- Insertion-replacement */
1923                                 MODBIT(term.mode, set, MODE_INSERT);
1924                                 break;
1925                         case 12: /* SRM -- Send/Receive */
1926                                 MODBIT(term.mode, !set, MODE_ECHO);
1927                                 break;
1928                         case 20: /* LNM -- Linefeed/new line */
1929                                 MODBIT(term.mode, set, MODE_CRLF);
1930                                 break;
1931                         default:
1932                                 fprintf(stderr,
1933                                         "erresc: unknown set/reset mode %d\n",
1934                                         *args);
1935                                 break;
1936                         }
1937                 }
1938         }
1939 }
1940
1941 void
1942 csihandle(void) {
1943         char buf[40];
1944         int len;
1945
1946         switch(csiescseq.mode) {
1947         default:
1948         unknown:
1949                 fprintf(stderr, "erresc: unknown csi ");
1950                 csidump();
1951                 /* die(""); */
1952                 break;
1953         case '@': /* ICH -- Insert <n> blank char */
1954                 DEFAULT(csiescseq.arg[0], 1);
1955                 tinsertblank(csiescseq.arg[0]);
1956                 break;
1957         case 'A': /* CUU -- Cursor <n> Up */
1958                 DEFAULT(csiescseq.arg[0], 1);
1959                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1960                 break;
1961         case 'B': /* CUD -- Cursor <n> Down */
1962         case 'e': /* VPR --Cursor <n> Down */
1963                 DEFAULT(csiescseq.arg[0], 1);
1964                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1965                 break;
1966         case 'i': /* MC -- Media Copy */
1967                 switch(csiescseq.arg[0]) {
1968                 case 0:
1969                         tdump();
1970                         break;
1971                 case 1:
1972                         tdumpline(term.c.y);
1973                         break;
1974                 case 2:
1975                         tdumpsel();
1976                         break;
1977                 case 4:
1978                         term.mode &= ~MODE_PRINT;
1979                         break;
1980                 case 5:
1981                         term.mode |= MODE_PRINT;
1982                         break;
1983                 }
1984                 break;
1985         case 'c': /* DA -- Device Attributes */
1986                 if(csiescseq.arg[0] == 0)
1987                         ttywrite(vtiden, sizeof(vtiden) - 1);
1988                 break;
1989         case 'C': /* CUF -- Cursor <n> Forward */
1990         case 'a': /* HPR -- Cursor <n> Forward */
1991                 DEFAULT(csiescseq.arg[0], 1);
1992                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1993                 break;
1994         case 'D': /* CUB -- Cursor <n> Backward */
1995                 DEFAULT(csiescseq.arg[0], 1);
1996                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1997                 break;
1998         case 'E': /* CNL -- Cursor <n> Down and first col */
1999                 DEFAULT(csiescseq.arg[0], 1);
2000                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2001                 break;
2002         case 'F': /* CPL -- Cursor <n> Up and first col */
2003                 DEFAULT(csiescseq.arg[0], 1);
2004                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2005                 break;
2006         case 'g': /* TBC -- Tabulation clear */
2007                 switch(csiescseq.arg[0]) {
2008                 case 0: /* clear current tab stop */
2009                         term.tabs[term.c.x] = 0;
2010                         break;
2011                 case 3: /* clear all the tabs */
2012                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2013                         break;
2014                 default:
2015                         goto unknown;
2016                 }
2017                 break;
2018         case 'G': /* CHA -- Move to <col> */
2019         case '`': /* HPA */
2020                 DEFAULT(csiescseq.arg[0], 1);
2021                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2022                 break;
2023         case 'H': /* CUP -- Move to <row> <col> */
2024         case 'f': /* HVP */
2025                 DEFAULT(csiescseq.arg[0], 1);
2026                 DEFAULT(csiescseq.arg[1], 1);
2027                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2028                 break;
2029         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2030                 DEFAULT(csiescseq.arg[0], 1);
2031                 tputtab(csiescseq.arg[0]);
2032                 break;
2033         case 'J': /* ED -- Clear screen */
2034                 selclear(NULL);
2035                 switch(csiescseq.arg[0]) {
2036                 case 0: /* below */
2037                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2038                         if(term.c.y < term.row-1) {
2039                                 tclearregion(0, term.c.y+1, term.col-1,
2040                                                 term.row-1);
2041                         }
2042                         break;
2043                 case 1: /* above */
2044                         if(term.c.y > 1)
2045                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2046                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2047                         break;
2048                 case 2: /* all */
2049                         tclearregion(0, 0, term.col-1, term.row-1);
2050                         break;
2051                 default:
2052                         goto unknown;
2053                 }
2054                 break;
2055         case 'K': /* EL -- Clear line */
2056                 switch(csiescseq.arg[0]) {
2057                 case 0: /* right */
2058                         tclearregion(term.c.x, term.c.y, term.col-1,
2059                                         term.c.y);
2060                         break;
2061                 case 1: /* left */
2062                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2063                         break;
2064                 case 2: /* all */
2065                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2066                         break;
2067                 }
2068                 break;
2069         case 'S': /* SU -- Scroll <n> line up */
2070                 DEFAULT(csiescseq.arg[0], 1);
2071                 tscrollup(term.top, csiescseq.arg[0]);
2072                 break;
2073         case 'T': /* SD -- Scroll <n> line down */
2074                 DEFAULT(csiescseq.arg[0], 1);
2075                 tscrolldown(term.top, csiescseq.arg[0]);
2076                 break;
2077         case 'L': /* IL -- Insert <n> blank lines */
2078                 DEFAULT(csiescseq.arg[0], 1);
2079                 tinsertblankline(csiescseq.arg[0]);
2080                 break;
2081         case 'l': /* RM -- Reset Mode */
2082                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2083                 break;
2084         case 'M': /* DL -- Delete <n> lines */
2085                 DEFAULT(csiescseq.arg[0], 1);
2086                 tdeleteline(csiescseq.arg[0]);
2087                 break;
2088         case 'X': /* ECH -- Erase <n> char */
2089                 DEFAULT(csiescseq.arg[0], 1);
2090                 tclearregion(term.c.x, term.c.y,
2091                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2092                 break;
2093         case 'P': /* DCH -- Delete <n> char */
2094                 DEFAULT(csiescseq.arg[0], 1);
2095                 tdeletechar(csiescseq.arg[0]);
2096                 break;
2097         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2098                 DEFAULT(csiescseq.arg[0], 1);
2099                 tputtab(-csiescseq.arg[0]);
2100                 break;
2101         case 'd': /* VPA -- Move to <row> */
2102                 DEFAULT(csiescseq.arg[0], 1);
2103                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2104                 break;
2105         case 'h': /* SM -- Set terminal mode */
2106                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2107                 break;
2108         case 'm': /* SGR -- Terminal attribute (color) */
2109                 tsetattr(csiescseq.arg, csiescseq.narg);
2110                 break;
2111         case 'n': /* DSR – Device Status Report (cursor position) */
2112                 if (csiescseq.arg[0] == 6) {
2113                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2114                                         term.c.y+1, term.c.x+1);
2115                         ttywrite(buf, len);
2116                 }
2117                 break;
2118         case 'r': /* DECSTBM -- Set Scrolling Region */
2119                 if(csiescseq.priv) {
2120                         goto unknown;
2121                 } else {
2122                         DEFAULT(csiescseq.arg[0], 1);
2123                         DEFAULT(csiescseq.arg[1], term.row);
2124                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2125                         tmoveato(0, 0);
2126                 }
2127                 break;
2128         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2129                 tcursor(CURSOR_SAVE);
2130                 break;
2131         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2132                 tcursor(CURSOR_LOAD);
2133                 break;
2134         }
2135 }
2136
2137 void
2138 csidump(void) {
2139         int i;
2140         uint c;
2141
2142         printf("ESC[");
2143         for(i = 0; i < csiescseq.len; i++) {
2144                 c = csiescseq.buf[i] & 0xff;
2145                 if(isprint(c)) {
2146                         putchar(c);
2147                 } else if(c == '\n') {
2148                         printf("(\\n)");
2149                 } else if(c == '\r') {
2150                         printf("(\\r)");
2151                 } else if(c == 0x1b) {
2152                         printf("(\\e)");
2153                 } else {
2154                         printf("(%02x)", c);
2155                 }
2156         }
2157         putchar('\n');
2158 }
2159
2160 void
2161 csireset(void) {
2162         memset(&csiescseq, 0, sizeof(csiescseq));
2163 }
2164
2165 void
2166 strhandle(void) {
2167         char *p = NULL;
2168         int j, narg, par;
2169
2170         term.esc &= ~(ESC_STR_END|ESC_STR);
2171         strparse();
2172         narg = strescseq.narg;
2173         par = atoi(strescseq.args[0]);
2174
2175         switch(strescseq.type) {
2176         case ']': /* OSC -- Operating System Command */
2177                 switch(par) {
2178                 case 0:
2179                 case 1:
2180                 case 2:
2181                         if(narg > 1)
2182                                 xsettitle(strescseq.args[1]);
2183                         return;
2184                 case 4: /* color set */
2185                         if(narg < 3)
2186                                 break;
2187                         p = strescseq.args[2];
2188                         /* FALLTHROUGH */
2189                 case 104: /* color reset, here p = NULL */
2190                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2191                         if(xsetcolorname(j, p)) {
2192                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2193                         } else {
2194                                 /*
2195                                  * TODO if defaultbg color is changed, borders
2196                                  * are dirty
2197                                  */
2198                                 redraw(0);
2199                         }
2200                         return;
2201                 }
2202                 break;
2203         case 'k': /* old title set compatibility */
2204                 xsettitle(strescseq.args[0]);
2205                 return;
2206         case 'P': /* DCS -- Device Control String */
2207         case '_': /* APC -- Application Program Command */
2208         case '^': /* PM -- Privacy Message */
2209                 return;
2210         }
2211
2212         fprintf(stderr, "erresc: unknown str ");
2213         strdump();
2214 }
2215
2216 void
2217 strparse(void) {
2218         char *p = strescseq.buf;
2219
2220         strescseq.narg = 0;
2221         strescseq.buf[strescseq.len] = '\0';
2222         while(p && strescseq.narg < STR_ARG_SIZ)
2223                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2224 }
2225
2226 void
2227 strdump(void) {
2228         int i;
2229         uint c;
2230
2231         printf("ESC%c", strescseq.type);
2232         for(i = 0; i < strescseq.len; i++) {
2233                 c = strescseq.buf[i] & 0xff;
2234                 if(c == '\0') {
2235                         return;
2236                 } else if(isprint(c)) {
2237                         putchar(c);
2238                 } else if(c == '\n') {
2239                         printf("(\\n)");
2240                 } else if(c == '\r') {
2241                         printf("(\\r)");
2242                 } else if(c == 0x1b) {
2243                         printf("(\\e)");
2244                 } else {
2245                         printf("(%02x)", c);
2246                 }
2247         }
2248         printf("ESC\\\n");
2249 }
2250
2251 void
2252 strreset(void) {
2253         memset(&strescseq, 0, sizeof(strescseq));
2254 }
2255
2256 void
2257 tprinter(char *s, size_t len) {
2258         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2259                 fprintf(stderr, "Error writing in %s:%s\n",
2260                         opt_io, strerror(errno));
2261                 close(iofd);
2262                 iofd = -1;
2263         }
2264 }
2265
2266 void
2267 toggleprinter(const Arg *arg) {
2268         term.mode ^= MODE_PRINT;
2269 }
2270
2271 void
2272 printscreen(const Arg *arg) {
2273         tdump();
2274 }
2275
2276 void
2277 printsel(const Arg *arg) {
2278         tdumpsel();
2279 }
2280
2281 void
2282 tdumpsel(void) {
2283         char *ptr;
2284
2285         if((ptr = getsel())) {
2286                 tprinter(ptr, strlen(ptr));
2287                 free(ptr);
2288         }
2289 }
2290
2291 void
2292 tdumpline(int n) {
2293         Glyph *bp, *end;
2294
2295         bp = &term.line[n][0];
2296         end = &bp[MIN(tlinelen(n), term.col) - 1];
2297         if(bp != end || bp->c[0] != ' ') {
2298                 for( ;bp <= end; ++bp)
2299                         tprinter(bp->c, utf8len(bp->c));
2300         }
2301         tprinter("\n", 1);
2302 }
2303
2304 void
2305 tdump(void) {
2306         int i;
2307
2308         for(i = 0; i < term.row; ++i)
2309                 tdumpline(i);
2310 }
2311
2312 void
2313 tputtab(int n) {
2314         uint x = term.c.x;
2315
2316         if(n > 0) {
2317                 while(x < term.col && n--)
2318                         for(++x; x < term.col && !term.tabs[x]; ++x)
2319                                 /* nothing */ ;
2320         } else if(n < 0) {
2321                 while(x > 0 && n++)
2322                         for(--x; x > 0 && !term.tabs[x]; --x)
2323                                 /* nothing */ ;
2324         }
2325         tmoveto(x, term.c.y);
2326 }
2327
2328 void
2329 techo(char *buf, int len) {
2330         for(; len > 0; buf++, len--) {
2331                 char c = *buf;
2332
2333                 if(ISCONTROL((uchar) c)) { /* control code */
2334                         if(c & 0x80) {
2335                                 c &= 0x7f;
2336                                 tputc("^", 1);
2337                                 tputc("[", 1);
2338                         } else if(c != '\n' && c != '\r' && c != '\t') {
2339                                 c ^= 0x40;
2340                                 tputc("^", 1);
2341                         }
2342                         tputc(&c, 1);
2343                 } else {
2344                         break;
2345                 }
2346         }
2347         if(len)
2348                 tputc(buf, len);
2349 }
2350
2351 void
2352 tdeftran(char ascii) {
2353         static char cs[] = "0B";
2354         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2355         char *p;
2356
2357         if((p = strchr(cs, ascii)) == NULL) {
2358                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2359         } else {
2360                 term.trantbl[term.icharset] = vcs[p - cs];
2361         }
2362 }
2363
2364 void
2365 tdectest(char c) {
2366         static char E[UTF_SIZ] = "E";
2367         int x, y;
2368
2369         if(c == '8') { /* DEC screen alignment test. */
2370                 for(x = 0; x < term.col; ++x) {
2371                         for(y = 0; y < term.row; ++y)
2372                                 tsetchar(E, &term.c.attr, x, y);
2373                 }
2374         }
2375 }
2376
2377 void
2378 tstrsequence(uchar c) {
2379         if (c & 0x80) {
2380                 switch (c) {
2381                 case 0x90:   /* DCS -- Device Control String */
2382                         c = 'P';
2383                         break;
2384                 case 0x9f:   /* APC -- Application Program Command */
2385                         c = '_';
2386                         break;
2387                 case 0x9e:   /* PM -- Privacy Message */
2388                         c = '^';
2389                         break;
2390                 case 0x9d:   /* OSC -- Operating System Command */
2391                         c = ']';
2392                         break;
2393                 }
2394         }
2395         strreset();
2396         strescseq.type = c;
2397         term.esc |= ESC_STR;
2398         return;
2399 }
2400
2401 void
2402 tcontrolcode(uchar ascii) {
2403         static char question[UTF_SIZ] = "?";
2404
2405         switch(ascii) {
2406         case '\t':   /* HT */
2407                 tputtab(1);
2408                 return;
2409         case '\b':   /* BS */
2410                 tmoveto(term.c.x-1, term.c.y);
2411                 return;
2412         case '\r':   /* CR */
2413                 tmoveto(0, term.c.y);
2414                 return;
2415         case '\f':   /* LF */
2416         case '\v':   /* VT */
2417         case '\n':   /* LF */
2418                 /* go to first col if the mode is set */
2419                 tnewline(IS_SET(MODE_CRLF));
2420                 return;
2421         case '\a':   /* BEL */
2422                 if(term.esc & ESC_STR_END) {
2423                         /* backwards compatibility to xterm */
2424                         strhandle();
2425                 } else {
2426                         if(!(xw.state & WIN_FOCUSED))
2427                                 xseturgency(1);
2428                         if (bellvolume)
2429                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2430                 }
2431                 break;
2432         case '\033': /* ESC */
2433                 csireset();
2434                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2435                 term.esc |= ESC_START;
2436                 return;
2437         case '\016': /* SO (LS1 -- Locking shift 1) */
2438         case '\017': /* SI (LS0 -- Locking shift 0) */
2439                 term.charset = 1 - (ascii - '\016');
2440                 return;
2441         case '\032': /* SUB */
2442                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2443         case '\030': /* CAN */
2444                 csireset();
2445                 break;
2446         case '\005': /* ENQ (IGNORED) */
2447         case '\000': /* NUL (IGNORED) */
2448         case '\021': /* XON (IGNORED) */
2449         case '\023': /* XOFF (IGNORED) */
2450         case 0177:   /* DEL (IGNORED) */
2451                 return;
2452         case 0x84:   /* TODO: IND */
2453                 break;
2454         case 0x85:   /* NEL -- Next line */
2455                 tnewline(1); /* always go to first col */
2456                 break;
2457         case 0x88:   /* HTS -- Horizontal tab stop */
2458                 term.tabs[term.c.x] = 1;
2459                 break;
2460         case 0x8d:   /* TODO: RI */
2461         case 0x8e:   /* TODO: SS2 */
2462         case 0x8f:   /* TODO: SS3 */
2463         case 0x98:   /* TODO: SOS */
2464                 break;
2465         case 0x9a:   /* DECID -- Identify Terminal */
2466                 ttywrite(vtiden, sizeof(vtiden) - 1);
2467                 break;
2468         case 0x9b:   /* TODO: CSI */
2469         case 0x9c:   /* TODO: ST */
2470                 break;
2471         case 0x90:   /* DCS -- Device Control String */
2472         case 0x9f:   /* APC -- Application Program Command */
2473         case 0x9e:   /* PM -- Privacy Message */
2474         case 0x9d:   /* OSC -- Operating System Command */
2475                 tstrsequence(ascii);
2476                 return;
2477         }
2478         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2479         term.esc &= ~(ESC_STR_END|ESC_STR);
2480         return;
2481 }
2482
2483 /*
2484  * returns 1 when the sequence is finished and it hasn't to read
2485  * more characters for this sequence, otherwise 0
2486  */
2487 int
2488 eschandle(uchar ascii) {
2489         switch(ascii) {
2490         case '[':
2491                 term.esc |= ESC_CSI;
2492                 return 0;
2493         case '#':
2494                 term.esc |= ESC_TEST;
2495                 return 0;
2496         case 'P': /* DCS -- Device Control String */
2497         case '_': /* APC -- Application Program Command */
2498         case '^': /* PM -- Privacy Message */
2499         case ']': /* OSC -- Operating System Command */
2500         case 'k': /* old title set compatibility */
2501                 tstrsequence(ascii);
2502                 return 0;
2503         case 'n': /* LS2 -- Locking shift 2 */
2504         case 'o': /* LS3 -- Locking shift 3 */
2505                 term.charset = 2 + (ascii - 'n');
2506                 break;
2507         case '(': /* GZD4 -- set primary charset G0 */
2508         case ')': /* G1D4 -- set secondary charset G1 */
2509         case '*': /* G2D4 -- set tertiary charset G2 */
2510         case '+': /* G3D4 -- set quaternary charset G3 */
2511                 term.icharset = ascii - '(';
2512                 term.esc |= ESC_ALTCHARSET;
2513                 return 0;
2514         case 'D': /* IND -- Linefeed */
2515                 if(term.c.y == term.bot) {
2516                         tscrollup(term.top, 1);
2517                 } else {
2518                         tmoveto(term.c.x, term.c.y+1);
2519                 }
2520                 break;
2521         case 'E': /* NEL -- Next line */
2522                 tnewline(1); /* always go to first col */
2523                 break;
2524         case 'H': /* HTS -- Horizontal tab stop */
2525                 term.tabs[term.c.x] = 1;
2526                 break;
2527         case 'M': /* RI -- Reverse index */
2528                 if(term.c.y == term.top) {
2529                         tscrolldown(term.top, 1);
2530                 } else {
2531                         tmoveto(term.c.x, term.c.y-1);
2532                 }
2533                 break;
2534         case 'Z': /* DECID -- Identify Terminal */
2535                 ttywrite(vtiden, sizeof(vtiden) - 1);
2536                 break;
2537         case 'c': /* RIS -- Reset to inital state */
2538                 treset();
2539                 xresettitle();
2540                 xloadcols();
2541                 break;
2542         case '=': /* DECPAM -- Application keypad */
2543                 term.mode |= MODE_APPKEYPAD;
2544                 break;
2545         case '>': /* DECPNM -- Normal keypad */
2546                 term.mode &= ~MODE_APPKEYPAD;
2547                 break;
2548         case '7': /* DECSC -- Save Cursor */
2549                 tcursor(CURSOR_SAVE);
2550                 break;
2551         case '8': /* DECRC -- Restore Cursor */
2552                 tcursor(CURSOR_LOAD);
2553                 break;
2554         case '\\': /* ST -- String Terminator */
2555                 if(term.esc & ESC_STR_END)
2556                         strhandle();
2557                 break;
2558         default:
2559                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2560                         (uchar) ascii, isprint(ascii)? ascii:'.');
2561                 break;
2562         }
2563         return 1;
2564 }
2565
2566 void
2567 tputc(char *c, int len) {
2568         uchar ascii;
2569         bool control;
2570         long unicodep;
2571         int width;
2572         Glyph *gp;
2573
2574         if(len == 1) {
2575                 width = 1;
2576                 unicodep = ascii = *c;
2577         } else {
2578                 utf8decode(c, &unicodep, UTF_SIZ);
2579                 if ((width = wcwidth(unicodep)) == -1) {
2580                         c = "\357\277\275";     /* UTF_INVALID */
2581                         width = 1;
2582                 }
2583                 control = ISCONTROLC1(unicodep);
2584                 ascii = unicodep;
2585         }
2586
2587         if(IS_SET(MODE_PRINT))
2588                 tprinter(c, len);
2589         control = ISCONTROL(unicodep);
2590
2591         /*
2592          * STR sequence must be checked before anything else
2593          * because it uses all following characters until it
2594          * receives a ESC, a SUB, a ST or any other C1 control
2595          * character.
2596          */
2597         if(term.esc & ESC_STR) {
2598                 if(width == 1 &&
2599                    (ascii == '\a' || ascii == 030 ||
2600                     ascii == 032  || ascii == 033 ||
2601                     ISCONTROLC1(unicodep))) {
2602                         term.esc &= ~(ESC_START|ESC_STR);
2603                         term.esc |= ESC_STR_END;
2604                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2605                         memmove(&strescseq.buf[strescseq.len], c, len);
2606                         strescseq.len += len;
2607                         return;
2608                 } else {
2609                 /*
2610                  * Here is a bug in terminals. If the user never sends
2611                  * some code to stop the str or esc command, then st
2612                  * will stop responding. But this is better than
2613                  * silently failing with unknown characters. At least
2614                  * then users will report back.
2615                  *
2616                  * In the case users ever get fixed, here is the code:
2617                  */
2618                 /*
2619                  * term.esc = 0;
2620                  * strhandle();
2621                  */
2622                         return;
2623                 }
2624         }
2625
2626         /*
2627          * Actions of control codes must be performed as soon they arrive
2628          * because they can be embedded inside a control sequence, and
2629          * they must not cause conflicts with sequences.
2630          */
2631         if(control) {
2632                 tcontrolcode(ascii);
2633                 /*
2634                  * control codes are not shown ever
2635                  */
2636                 return;
2637         } else if(term.esc & ESC_START) {
2638                 if(term.esc & ESC_CSI) {
2639                         csiescseq.buf[csiescseq.len++] = ascii;
2640                         if(BETWEEN(ascii, 0x40, 0x7E)
2641                                         || csiescseq.len >= \
2642                                         sizeof(csiescseq.buf)-1) {
2643                                 term.esc = 0;
2644                                 csiparse();
2645                                 csihandle();
2646                         }
2647                         return;
2648                 } else if(term.esc & ESC_ALTCHARSET) {
2649                         tdeftran(ascii);
2650                 } else if(term.esc & ESC_TEST) {
2651                         tdectest(ascii);
2652                 } else {
2653                         if (!eschandle(ascii))
2654                                 return;
2655                         /* sequence already finished */
2656                 }
2657                 term.esc = 0;
2658                 /*
2659                  * All characters which form part of a sequence are not
2660                  * printed
2661                  */
2662                 return;
2663         }
2664         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2665                 selclear(NULL);
2666
2667         gp = &term.line[term.c.y][term.c.x];
2668         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2669                 gp->mode |= ATTR_WRAP;
2670                 tnewline(1);
2671         }
2672
2673         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2674                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2675
2676         if(term.c.x+width > term.col)
2677                 tnewline(1);
2678
2679         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2680
2681         if(width == 2) {
2682                 gp->mode |= ATTR_WIDE;
2683                 if(term.c.x+1 < term.col) {
2684                         gp[1].c[0] = '\0';
2685                         gp[1].mode = ATTR_WDUMMY;
2686                 }
2687         }
2688         if(term.c.x+width < term.col) {
2689                 tmoveto(term.c.x+width, term.c.y);
2690         } else {
2691                 term.c.state |= CURSOR_WRAPNEXT;
2692         }
2693 }
2694
2695 void
2696 tresize(int col, int row) {
2697         int i;
2698         int minrow = MIN(row, term.row);
2699         int mincol = MIN(col, term.col);
2700         int slide = term.c.y - row + 1;
2701         bool *bp;
2702         TCursor c;
2703
2704         if(col < 1 || row < 1) {
2705                 fprintf(stderr,
2706                         "tresize: error resizing to %dx%d\n", col, row);
2707                 return;
2708         }
2709
2710         /* free unneeded rows */
2711         i = 0;
2712         if(slide > 0) {
2713                 /*
2714                  * slide screen to keep cursor where we expect it -
2715                  * tscrollup would work here, but we can optimize to
2716                  * memmove because we're freeing the earlier lines
2717                  */
2718                 for(/* i = 0 */; i < slide; i++) {
2719                         free(term.line[i]);
2720                         free(term.alt[i]);
2721                 }
2722                 memmove(term.line, term.line + slide, row * sizeof(Line));
2723                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2724         }
2725         for(i += row; i < term.row; i++) {
2726                 free(term.line[i]);
2727                 free(term.alt[i]);
2728         }
2729
2730         /* resize to new height */
2731         term.line = xrealloc(term.line, row * sizeof(Line));
2732         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2733         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2734         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2735
2736         /* resize each row to new width, zero-pad if needed */
2737         for(i = 0; i < minrow; i++) {
2738                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2739                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2740         }
2741
2742         /* allocate any new rows */
2743         for(/* i == minrow */; i < row; i++) {
2744                 term.line[i] = xmalloc(col * sizeof(Glyph));
2745                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2746         }
2747         if(col > term.col) {
2748                 bp = term.tabs + term.col;
2749
2750                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2751                 while(--bp > term.tabs && !*bp)
2752                         /* nothing */ ;
2753                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2754                         *bp = 1;
2755         }
2756         /* update terminal size */
2757         term.col = col;
2758         term.row = row;
2759         /* reset scrolling region */
2760         tsetscroll(0, row-1);
2761         /* make use of the LIMIT in tmoveto */
2762         tmoveto(term.c.x, term.c.y);
2763         /* Clearing both screens (it makes dirty all lines) */
2764         c = term.c;
2765         for(i = 0; i < 2; i++) {
2766                 if(mincol < col && 0 < minrow) {
2767                         tclearregion(mincol, 0, col - 1, minrow - 1);
2768                 }
2769                 if(0 < col && minrow < row) {
2770                         tclearregion(0, minrow, col - 1, row - 1);
2771                 }
2772                 tswapscreen();
2773                 tcursor(CURSOR_LOAD);
2774         }
2775         term.c = c;
2776 }
2777
2778 void
2779 xresize(int col, int row) {
2780         xw.tw = MAX(1, col * xw.cw);
2781         xw.th = MAX(1, row * xw.ch);
2782
2783         XFreePixmap(xw.dpy, xw.buf);
2784         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2785                         DefaultDepth(xw.dpy, xw.scr));
2786         XftDrawChange(xw.draw, xw.buf);
2787         xclear(0, 0, xw.w, xw.h);
2788 }
2789
2790 static inline ushort
2791 sixd_to_16bit(int x) {
2792         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2793 }
2794
2795 void
2796 xloadcols(void) {
2797         int i;
2798         XRenderColor color = { .alpha = 0xffff };
2799         static bool loaded;
2800         Color *cp;
2801
2802         if(loaded) {
2803                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2804                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2805         }
2806
2807         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2808         for(i = 0; i < LEN(colorname); i++) {
2809                 if(!colorname[i])
2810                         continue;
2811                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2812                         die("Could not allocate color '%s'\n", colorname[i]);
2813                 }
2814         }
2815
2816         /* load colors [16-231] ; same colors as xterm */
2817         for(i = 16; i < 6*6*6+16; i++) {
2818                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2819                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2820                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2821                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2822                         die("Could not allocate color %d\n", i);
2823         }
2824
2825         /* load colors [232-255] ; grayscale */
2826         for(; i < 256; i++) {
2827                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2828                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2829                         die("Could not allocate color %d\n", i);
2830         }
2831         loaded = true;
2832 }
2833
2834 int
2835 xsetcolorname(int x, const char *name) {
2836         XRenderColor color = { .alpha = 0xffff };
2837         Color ncolor;
2838
2839         if(!BETWEEN(x, 0, LEN(colorname)))
2840                 return 1;
2841
2842         if(!name) {
2843                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2844                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2845                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2846                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2847                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2848                                                 xw.cmap, &color, &ncolor)) {
2849                                 return 1;
2850                         }
2851
2852                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2853                         dc.col[x] = ncolor;
2854                         return 0;
2855                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2856                         color.red = color.green = color.blue = \
2857                                     0x0808 + 0x0a0a * (x - (16 + 216));
2858                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2859                                                 xw.cmap, &color, &ncolor)) {
2860                                 return 1;
2861                         }
2862
2863                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2864                         dc.col[x] = ncolor;
2865                         return 0;
2866                 } else { /* system colors */
2867                         name = colorname[x];
2868                 }
2869         }
2870         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2871                 return 1;
2872
2873         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2874         dc.col[x] = ncolor;
2875         return 0;
2876 }
2877
2878 void
2879 xtermclear(int col1, int row1, int col2, int row2) {
2880         XftDrawRect(xw.draw,
2881                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2882                         borderpx + col1 * xw.cw,
2883                         borderpx + row1 * xw.ch,
2884                         (col2-col1+1) * xw.cw,
2885                         (row2-row1+1) * xw.ch);
2886 }
2887
2888 /*
2889  * Absolute coordinates.
2890  */
2891 void
2892 xclear(int x1, int y1, int x2, int y2) {
2893         XftDrawRect(xw.draw,
2894                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2895                         x1, y1, x2-x1, y2-y1);
2896 }
2897
2898 void
2899 xhints(void) {
2900         XClassHint class = {opt_class ? opt_class : termname, termname};
2901         XWMHints wm = {.flags = InputHint, .input = 1};
2902         XSizeHints *sizeh = NULL;
2903
2904         sizeh = XAllocSizeHints();
2905
2906         sizeh->flags = PSize | PResizeInc | PBaseSize;
2907         sizeh->height = xw.h;
2908         sizeh->width = xw.w;
2909         sizeh->height_inc = xw.ch;
2910         sizeh->width_inc = xw.cw;
2911         sizeh->base_height = 2 * borderpx;
2912         sizeh->base_width = 2 * borderpx;
2913         if(xw.isfixed == True) {
2914                 sizeh->flags |= PMaxSize | PMinSize;
2915                 sizeh->min_width = sizeh->max_width = xw.w;
2916                 sizeh->min_height = sizeh->max_height = xw.h;
2917         }
2918         if(xw.gm & (XValue|YValue)) {
2919                 sizeh->flags |= USPosition | PWinGravity;
2920                 sizeh->x = xw.l;
2921                 sizeh->y = xw.t;
2922                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2923         }
2924
2925         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2926                         &class);
2927         XFree(sizeh);
2928 }
2929
2930 int
2931 xgeommasktogravity(int mask) {
2932         switch(mask & (XNegative|YNegative)) {
2933         case 0:
2934                 return NorthWestGravity;
2935         case XNegative:
2936                 return NorthEastGravity;
2937         case YNegative:
2938                 return SouthWestGravity;
2939         }
2940         return SouthEastGravity;
2941 }
2942
2943 int
2944 xloadfont(Font *f, FcPattern *pattern) {
2945         FcPattern *match;
2946         FcResult result;
2947
2948         match = FcFontMatch(NULL, pattern, &result);
2949         if(!match)
2950                 return 1;
2951
2952         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2953                 FcPatternDestroy(match);
2954                 return 1;
2955         }
2956
2957         f->set = NULL;
2958         f->pattern = FcPatternDuplicate(pattern);
2959
2960         f->ascent = f->match->ascent;
2961         f->descent = f->match->descent;
2962         f->lbearing = 0;
2963         f->rbearing = f->match->max_advance_width;
2964
2965         f->height = f->ascent + f->descent;
2966         f->width = f->lbearing + f->rbearing;
2967
2968         return 0;
2969 }
2970
2971 void
2972 xloadfonts(char *fontstr, double fontsize) {
2973         FcPattern *pattern;
2974         FcResult r_sz, r_psz;
2975         double fontval;
2976         float ceilf(float);
2977
2978         if(fontstr[0] == '-') {
2979                 pattern = XftXlfdParse(fontstr, False, False);
2980         } else {
2981                 pattern = FcNameParse((FcChar8 *)fontstr);
2982         }
2983
2984         if(!pattern)
2985                 die("st: can't open font %s\n", fontstr);
2986
2987         if(fontsize > 0) {
2988                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2989                 FcPatternDel(pattern, FC_SIZE);
2990                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2991                 usedfontsize = fontsize;
2992         } else {
2993                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2994                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2995                 if(r_psz == FcResultMatch) {
2996                         usedfontsize = fontval;
2997                 } else if(r_sz == FcResultMatch) {
2998                         usedfontsize = -1;
2999                 } else {
3000                         /*
3001                          * Default font size is 12, if none given. This is to
3002                          * have a known usedfontsize value.
3003                          */
3004                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3005                         usedfontsize = 12;
3006                 }
3007                 defaultfontsize = usedfontsize;
3008         }
3009
3010         FcConfigSubstitute(0, pattern, FcMatchPattern);
3011         FcDefaultSubstitute(pattern);
3012
3013         if(xloadfont(&dc.font, pattern))
3014                 die("st: can't open font %s\n", fontstr);
3015
3016         if(usedfontsize < 0) {
3017                 FcPatternGetDouble(dc.font.match->pattern,
3018                                    FC_PIXEL_SIZE, 0, &fontval);
3019                 usedfontsize = fontval;
3020                 if(fontsize == 0)
3021                         defaultfontsize = fontval;
3022         }
3023
3024         /* Setting character width and height. */
3025         xw.cw = ceilf(dc.font.width * cwscale);
3026         xw.ch = ceilf(dc.font.height * chscale);
3027
3028         FcPatternDel(pattern, FC_SLANT);
3029         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3030         if(xloadfont(&dc.ifont, pattern))
3031                 die("st: can't open font %s\n", fontstr);
3032
3033         FcPatternDel(pattern, FC_WEIGHT);
3034         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3035         if(xloadfont(&dc.ibfont, pattern))
3036                 die("st: can't open font %s\n", fontstr);
3037
3038         FcPatternDel(pattern, FC_SLANT);
3039         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3040         if(xloadfont(&dc.bfont, pattern))
3041                 die("st: can't open font %s\n", fontstr);
3042
3043         FcPatternDestroy(pattern);
3044 }
3045
3046 int
3047 xloadfontset(Font *f) {
3048         FcResult result;
3049
3050         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3051                 return 1;
3052         return 0;
3053 }
3054
3055 void
3056 xunloadfont(Font *f) {
3057         XftFontClose(xw.dpy, f->match);
3058         FcPatternDestroy(f->pattern);
3059         if(f->set)
3060                 FcFontSetDestroy(f->set);
3061 }
3062
3063 void
3064 xunloadfonts(void) {
3065         /* Free the loaded fonts in the font cache.  */
3066         while(frclen > 0)
3067                 XftFontClose(xw.dpy, frc[--frclen].font);
3068
3069         xunloadfont(&dc.font);
3070         xunloadfont(&dc.bfont);
3071         xunloadfont(&dc.ifont);
3072         xunloadfont(&dc.ibfont);
3073 }
3074
3075 void
3076 xzoom(const Arg *arg) {
3077         Arg larg;
3078
3079         larg.i = usedfontsize + arg->i;
3080         xzoomabs(&larg);
3081 }
3082
3083 void
3084 xzoomabs(const Arg *arg) {
3085         xunloadfonts();
3086         xloadfonts(usedfont, arg->i);
3087         cresize(0, 0);
3088         redraw(0);
3089         xhints();
3090 }
3091
3092 void
3093 xzoomreset(const Arg *arg) {
3094         Arg larg;
3095
3096         if(defaultfontsize > 0) {
3097                 larg.i = defaultfontsize;
3098                 xzoomabs(&larg);
3099         }
3100 }
3101
3102 void
3103 xinit(void) {
3104         XGCValues gcvalues;
3105         Cursor cursor;
3106         Window parent;
3107         pid_t thispid = getpid();
3108
3109         if(!(xw.dpy = XOpenDisplay(NULL)))
3110                 die("Can't open display\n");
3111         xw.scr = XDefaultScreen(xw.dpy);
3112         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3113
3114         /* font */
3115         if(!FcInit())
3116                 die("Could not init fontconfig.\n");
3117
3118         usedfont = (opt_font == NULL)? font : opt_font;
3119         xloadfonts(usedfont, 0);
3120
3121         /* colors */
3122         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3123         xloadcols();
3124
3125         /* adjust fixed window geometry */
3126         xw.w = 2 * borderpx + term.col * xw.cw;
3127         xw.h = 2 * borderpx + term.row * xw.ch;
3128         if(xw.gm & XNegative)
3129                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3130         if(xw.gm & YNegative)
3131                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3132
3133         /* Events */
3134         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3135         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3136         xw.attrs.bit_gravity = NorthWestGravity;
3137         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3138                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3139                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3140         xw.attrs.colormap = xw.cmap;
3141
3142         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3143                 parent = XRootWindow(xw.dpy, xw.scr);
3144         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3145                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3146                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3147                         | CWEventMask | CWColormap, &xw.attrs);
3148
3149         memset(&gcvalues, 0, sizeof(gcvalues));
3150         gcvalues.graphics_exposures = False;
3151         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3152                         &gcvalues);
3153         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3154                         DefaultDepth(xw.dpy, xw.scr));
3155         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3156         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3157
3158         /* Xft rendering context */
3159         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3160
3161         /* input methods */
3162         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3163                 XSetLocaleModifiers("@im=local");
3164                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3165                         XSetLocaleModifiers("@im=");
3166                         if((xw.xim = XOpenIM(xw.dpy,
3167                                         NULL, NULL, NULL)) == NULL) {
3168                                 die("XOpenIM failed. Could not open input"
3169                                         " device.\n");
3170                         }
3171                 }
3172         }
3173         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3174                                            | XIMStatusNothing, XNClientWindow, xw.win,
3175                                            XNFocusWindow, xw.win, NULL);
3176         if(xw.xic == NULL)
3177                 die("XCreateIC failed. Could not obtain input method.\n");
3178
3179         /* white cursor, black outline */
3180         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3181         XDefineCursor(xw.dpy, xw.win, cursor);
3182         XRecolorCursor(xw.dpy, cursor,
3183                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3184                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3185
3186         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3187         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3188         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3189         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3190
3191         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3192         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3193                         PropModeReplace, (uchar *)&thispid, 1);
3194
3195         xresettitle();
3196         XMapWindow(xw.dpy, xw.win);
3197         xhints();
3198         XSync(xw.dpy, False);
3199 }
3200
3201 void
3202 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3203         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3204             width = charlen * xw.cw, xp, i;
3205         int frcflags;
3206         int u8fl, u8fblen, u8cblen, doesexist;
3207         char *u8c, *u8fs;
3208         long unicodep;
3209         Font *font = &dc.font;
3210         FcResult fcres;
3211         FcPattern *fcpattern, *fontpattern;
3212         FcFontSet *fcsets[] = { NULL };
3213         FcCharSet *fccharset;
3214         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3215         XRenderColor colfg, colbg;
3216         XRectangle r;
3217         int oneatatime;
3218
3219         frcflags = FRC_NORMAL;
3220
3221         if(base.mode & ATTR_ITALIC) {
3222                 if(base.fg == defaultfg)
3223                         base.fg = defaultitalic;
3224                 font = &dc.ifont;
3225                 frcflags = FRC_ITALIC;
3226         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3227                 if(base.fg == defaultfg)
3228                         base.fg = defaultitalic;
3229                 font = &dc.ibfont;
3230                 frcflags = FRC_ITALICBOLD;
3231         } else if(base.mode & ATTR_UNDERLINE) {
3232                 if(base.fg == defaultfg)
3233                         base.fg = defaultunderline;
3234         }
3235
3236         if(IS_TRUECOL(base.fg)) {
3237                 colfg.alpha = 0xffff;
3238                 colfg.red = TRUERED(base.fg);
3239                 colfg.green = TRUEGREEN(base.fg);
3240                 colfg.blue = TRUEBLUE(base.fg);
3241                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3242                 fg = &truefg;
3243         } else {
3244                 fg = &dc.col[base.fg];
3245         }
3246
3247         if(IS_TRUECOL(base.bg)) {
3248                 colbg.alpha = 0xffff;
3249                 colbg.green = TRUEGREEN(base.bg);
3250                 colbg.red = TRUERED(base.bg);
3251                 colbg.blue = TRUEBLUE(base.bg);
3252                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3253                 bg = &truebg;
3254         } else {
3255                 bg = &dc.col[base.bg];
3256         }
3257
3258         if(base.mode & ATTR_BOLD) {
3259                 /*
3260                  * change basic system colors [0-7]
3261                  * to bright system colors [8-15]
3262                  */
3263                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3264                         fg = &dc.col[base.fg + 8];
3265
3266                 if(base.mode & ATTR_ITALIC) {
3267                         font = &dc.ibfont;
3268                         frcflags = FRC_ITALICBOLD;
3269                 } else {
3270                         font = &dc.bfont;
3271                         frcflags = FRC_BOLD;
3272                 }
3273         }
3274
3275         if(IS_SET(MODE_REVERSE)) {
3276                 if(fg == &dc.col[defaultfg]) {
3277                         fg = &dc.col[defaultbg];
3278                 } else {
3279                         colfg.red = ~fg->color.red;
3280                         colfg.green = ~fg->color.green;
3281                         colfg.blue = ~fg->color.blue;
3282                         colfg.alpha = fg->color.alpha;
3283                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3284                                         &revfg);
3285                         fg = &revfg;
3286                 }
3287
3288                 if(bg == &dc.col[defaultbg]) {
3289                         bg = &dc.col[defaultfg];
3290                 } else {
3291                         colbg.red = ~bg->color.red;
3292                         colbg.green = ~bg->color.green;
3293                         colbg.blue = ~bg->color.blue;
3294                         colbg.alpha = bg->color.alpha;
3295                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3296                                         &revbg);
3297                         bg = &revbg;
3298                 }
3299         }
3300
3301         if(base.mode & ATTR_REVERSE) {
3302                 temp = fg;
3303                 fg = bg;
3304                 bg = temp;
3305         }
3306
3307         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3308                 colfg.red = fg->color.red / 2;
3309                 colfg.green = fg->color.green / 2;
3310                 colfg.blue = fg->color.blue / 2;
3311                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3312                 fg = &revfg;
3313         }
3314
3315         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3316                 fg = bg;
3317
3318         if(base.mode & ATTR_INVISIBLE)
3319                 fg = bg;
3320
3321         /* Intelligent cleaning up of the borders. */
3322         if(x == 0) {
3323                 xclear(0, (y == 0)? 0 : winy, borderpx,
3324                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3325         }
3326         if(x + charlen >= term.col) {
3327                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3328                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3329         }
3330         if(y == 0)
3331                 xclear(winx, 0, winx + width, borderpx);
3332         if(y == term.row-1)
3333                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3334
3335         /* Clean up the region we want to draw to. */
3336         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3337
3338         /* Set the clip region because Xft is sometimes dirty. */
3339         r.x = 0;
3340         r.y = 0;
3341         r.height = xw.ch;
3342         r.width = width;
3343         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3344
3345         for(xp = winx; bytelen > 0;) {
3346                 /*
3347                  * Search for the range in the to be printed string of glyphs
3348                  * that are in the main font. Then print that range. If
3349                  * some glyph is found that is not in the font, do the
3350                  * fallback dance.
3351                  */
3352                 u8fs = s;
3353                 u8fblen = 0;
3354                 u8fl = 0;
3355                 oneatatime = font->width != xw.cw;
3356                 for(;;) {
3357                         u8c = s;
3358                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3359                         s += u8cblen;
3360                         bytelen -= u8cblen;
3361
3362                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3363                         if(doesexist) {
3364                                         u8fl++;
3365                                         u8fblen += u8cblen;
3366                                         if(!oneatatime && bytelen > 0)
3367                                                         continue;
3368                         }
3369
3370                         if(u8fl > 0) {
3371                                 XftDrawStringUtf8(xw.draw, fg,
3372                                                 font->match, xp,
3373                                                 winy + font->ascent,
3374                                                 (FcChar8 *)u8fs,
3375                                                 u8fblen);
3376                                 xp += xw.cw * u8fl;
3377                         }
3378                         break;
3379                 }
3380                 if(doesexist) {
3381                         if(oneatatime)
3382                                 continue;
3383                         break;
3384                 }
3385
3386                 /* Search the font cache. */
3387                 for(i = 0; i < frclen; i++) {
3388                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3389                                         && frc[i].flags == frcflags) {
3390                                 break;
3391                         }
3392                 }
3393
3394                 /* Nothing was found. */
3395                 if(i >= frclen) {
3396                         if(!font->set)
3397                                 xloadfontset(font);
3398                         fcsets[0] = font->set;
3399
3400                         /*
3401                          * Nothing was found in the cache. Now use
3402                          * some dozen of Fontconfig calls to get the
3403                          * font for one single character.
3404                          *
3405                          * Xft and fontconfig are design failures.
3406                          */
3407                         fcpattern = FcPatternDuplicate(font->pattern);
3408                         fccharset = FcCharSetCreate();
3409
3410                         FcCharSetAddChar(fccharset, unicodep);
3411                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3412                                         fccharset);
3413                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3414                                         FcTrue);
3415
3416                         FcConfigSubstitute(0, fcpattern,
3417                                         FcMatchPattern);
3418                         FcDefaultSubstitute(fcpattern);
3419
3420                         fontpattern = FcFontSetMatch(0, fcsets,
3421                                         FcTrue, fcpattern, &fcres);
3422
3423                         /*
3424                          * Overwrite or create the new cache entry.
3425                          */
3426                         if(frclen >= LEN(frc)) {
3427                                 frclen = LEN(frc) - 1;
3428                                 XftFontClose(xw.dpy, frc[frclen].font);
3429                         }
3430
3431                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3432                                         fontpattern);
3433                         frc[frclen].flags = frcflags;
3434
3435                         i = frclen;
3436                         frclen++;
3437
3438                         FcPatternDestroy(fcpattern);
3439                         FcCharSetDestroy(fccharset);
3440                 }
3441
3442                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3443                                 xp, winy + frc[i].font->ascent,
3444                                 (FcChar8 *)u8c, u8cblen);
3445
3446                 xp += xw.cw * wcwidth(unicodep);
3447         }
3448
3449         /*
3450          * This is how the loop above actually should be. Why does the
3451          * application have to care about font details?
3452          *
3453          * I have to repeat: Xft and Fontconfig are design failures.
3454          */
3455         /*
3456         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3457                         winy + font->ascent, (FcChar8 *)s, bytelen);
3458         */
3459
3460         if(base.mode & ATTR_UNDERLINE) {
3461                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3462                                 width, 1);
3463         }
3464
3465         if(base.mode & ATTR_STRUCK) {
3466                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3467                                 width, 1);
3468         }
3469
3470         /* Reset clip to none. */
3471         XftDrawSetClip(xw.draw, 0);
3472 }
3473
3474 void
3475 xdrawcursor(void) {
3476         static int oldx = 0, oldy = 0;
3477         int sl, width, curx;
3478         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3479
3480         LIMIT(oldx, 0, term.col-1);
3481         LIMIT(oldy, 0, term.row-1);
3482
3483         curx = term.c.x;
3484
3485         /* adjust position if in dummy */
3486         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3487                 oldx--;
3488         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3489                 curx--;
3490
3491         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3492
3493         /* remove the old cursor */
3494         sl = utf8len(term.line[oldy][oldx].c);
3495         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3496         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3497                         oldy, width, sl);
3498
3499         if(IS_SET(MODE_HIDE))
3500                 return;
3501
3502         /* draw the new one */
3503         if(xw.state & WIN_FOCUSED) {
3504                 if(IS_SET(MODE_REVERSE)) {
3505                         g.mode |= ATTR_REVERSE;
3506                         g.fg = defaultcs;
3507                         g.bg = defaultfg;
3508                 }
3509
3510                 sl = utf8len(g.c);
3511                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3512                         ? 2 : 1;
3513                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3514         } else {
3515                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3516                                 borderpx + curx * xw.cw,
3517                                 borderpx + term.c.y * xw.ch,
3518                                 xw.cw - 1, 1);
3519                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3520                                 borderpx + curx * xw.cw,
3521                                 borderpx + term.c.y * xw.ch,
3522                                 1, xw.ch - 1);
3523                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3524                                 borderpx + (curx + 1) * xw.cw - 1,
3525                                 borderpx + term.c.y * xw.ch,
3526                                 1, xw.ch - 1);
3527                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3528                                 borderpx + curx * xw.cw,
3529                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3530                                 xw.cw, 1);
3531         }
3532         oldx = curx, oldy = term.c.y;
3533 }
3534
3535
3536 void
3537 xsettitle(char *p) {
3538         XTextProperty prop;
3539
3540         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3541                         &prop);
3542         XSetWMName(xw.dpy, xw.win, &prop);
3543         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3544         XFree(prop.value);
3545 }
3546
3547 void
3548 xresettitle(void) {
3549         xsettitle(opt_title ? opt_title : "st");
3550 }
3551
3552 void
3553 redraw(int timeout) {
3554         struct timespec tv = {0, timeout * 1000};
3555
3556         tfulldirt();
3557         draw();
3558
3559         if(timeout > 0) {
3560                 nanosleep(&tv, NULL);
3561                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3562         }
3563 }
3564
3565 void
3566 draw(void) {
3567         drawregion(0, 0, term.col, term.row);
3568         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3569                         xw.h, 0, 0);
3570         XSetForeground(xw.dpy, dc.gc,
3571                         dc.col[IS_SET(MODE_REVERSE)?
3572                                 defaultfg : defaultbg].pixel);
3573 }
3574
3575 void
3576 drawregion(int x1, int y1, int x2, int y2) {
3577         int ic, ib, x, y, ox, sl;
3578         Glyph base, new;
3579         char buf[DRAW_BUF_SIZ];
3580         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3581         long unicodep;
3582
3583         if(!(xw.state & WIN_VISIBLE))
3584                 return;
3585
3586         for(y = y1; y < y2; y++) {
3587                 if(!term.dirty[y])
3588                         continue;
3589
3590                 xtermclear(0, y, term.col, y);
3591                 term.dirty[y] = 0;
3592                 base = term.line[y][0];
3593                 ic = ib = ox = 0;
3594                 for(x = x1; x < x2; x++) {
3595                         new = term.line[y][x];
3596                         if(new.mode == ATTR_WDUMMY)
3597                                 continue;
3598                         if(ena_sel && selected(x, y))
3599                                 new.mode ^= ATTR_REVERSE;
3600                         if(ib > 0 && (ATTRCMP(base, new)
3601                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3602                                 xdraws(buf, base, ox, y, ic, ib);
3603                                 ic = ib = 0;
3604                         }
3605                         if(ib == 0) {
3606                                 ox = x;
3607                                 base = new;
3608                         }
3609
3610                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3611                         memcpy(buf+ib, new.c, sl);
3612                         ib += sl;
3613                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3614                 }
3615                 if(ib > 0)
3616                         xdraws(buf, base, ox, y, ic, ib);
3617         }
3618         xdrawcursor();
3619 }
3620
3621 void
3622 expose(XEvent *ev) {
3623         XExposeEvent *e = &ev->xexpose;
3624
3625         if(xw.state & WIN_REDRAW) {
3626                 if(!e->count)
3627                         xw.state &= ~WIN_REDRAW;
3628         }
3629         redraw(0);
3630 }
3631
3632 void
3633 visibility(XEvent *ev) {
3634         XVisibilityEvent *e = &ev->xvisibility;
3635
3636         if(e->state == VisibilityFullyObscured) {
3637                 xw.state &= ~WIN_VISIBLE;
3638         } else if(!(xw.state & WIN_VISIBLE)) {
3639                 /* need a full redraw for next Expose, not just a buf copy */
3640                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3641         }
3642 }
3643
3644 void
3645 unmap(XEvent *ev) {
3646         xw.state &= ~WIN_VISIBLE;
3647 }
3648
3649 void
3650 xsetpointermotion(int set) {
3651         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3652         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3653 }
3654
3655 void
3656 xseturgency(int add) {
3657         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3658
3659         MODBIT(h->flags, add, XUrgencyHint);
3660         XSetWMHints(xw.dpy, xw.win, h);
3661         XFree(h);
3662 }
3663
3664 void
3665 focus(XEvent *ev) {
3666         XFocusChangeEvent *e = &ev->xfocus;
3667
3668         if(e->mode == NotifyGrab)
3669                 return;
3670
3671         if(ev->type == FocusIn) {
3672                 XSetICFocus(xw.xic);
3673                 xw.state |= WIN_FOCUSED;
3674                 xseturgency(0);
3675                 if(IS_SET(MODE_FOCUS))
3676                         ttywrite("\033[I", 3);
3677         } else {
3678                 XUnsetICFocus(xw.xic);
3679                 xw.state &= ~WIN_FOCUSED;
3680                 if(IS_SET(MODE_FOCUS))
3681                         ttywrite("\033[O", 3);
3682         }
3683 }
3684
3685 static inline bool
3686 match(uint mask, uint state) {
3687         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3688 }
3689
3690 void
3691 numlock(const Arg *dummy) {
3692         term.numlock ^= 1;
3693 }
3694
3695 char*
3696 kmap(KeySym k, uint state) {
3697         Key *kp;
3698         int i;
3699
3700         /* Check for mapped keys out of X11 function keys. */
3701         for(i = 0; i < LEN(mappedkeys); i++) {
3702                 if(mappedkeys[i] == k)
3703                         break;
3704         }
3705         if(i == LEN(mappedkeys)) {
3706                 if((k & 0xFFFF) < 0xFD00)
3707                         return NULL;
3708         }
3709
3710         for(kp = key; kp < key + LEN(key); kp++) {
3711                 if(kp->k != k)
3712                         continue;
3713
3714                 if(!match(kp->mask, state))
3715                         continue;
3716
3717                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3718                         continue;
3719                 if(term.numlock && kp->appkey == 2)
3720                         continue;
3721
3722                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3723                         continue;
3724
3725                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3726                         continue;
3727
3728                 return kp->s;
3729         }
3730
3731         return NULL;
3732 }
3733
3734 void
3735 kpress(XEvent *ev) {
3736         XKeyEvent *e = &ev->xkey;
3737         KeySym ksym;
3738         char buf[32], *customkey;
3739         int len;
3740         long c;
3741         Status status;
3742         Shortcut *bp;
3743
3744         if(IS_SET(MODE_KBDLOCK))
3745                 return;
3746
3747         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3748         /* 1. shortcuts */
3749         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3750                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3751                         bp->func(&(bp->arg));
3752                         return;
3753                 }
3754         }
3755
3756         /* 2. custom keys from config.h */
3757         if((customkey = kmap(ksym, e->state))) {
3758                 ttysend(customkey, strlen(customkey));
3759                 return;
3760         }
3761
3762         /* 3. composed string from input method */
3763         if(len == 0)
3764                 return;
3765         if(len == 1 && e->state & Mod1Mask) {
3766                 if(IS_SET(MODE_8BIT)) {
3767                         if(*buf < 0177) {
3768                                 c = *buf | 0x80;
3769                                 len = utf8encode(c, buf, UTF_SIZ);
3770                         }
3771                 } else {
3772                         buf[1] = buf[0];
3773                         buf[0] = '\033';
3774                         len = 2;
3775                 }
3776         }
3777         ttysend(buf, len);
3778 }
3779
3780
3781 void
3782 cmessage(XEvent *e) {
3783         /*
3784          * See xembed specs
3785          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3786          */
3787         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3788                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3789                         xw.state |= WIN_FOCUSED;
3790                         xseturgency(0);
3791                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3792                         xw.state &= ~WIN_FOCUSED;
3793                 }
3794         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3795                 /* Send SIGHUP to shell */
3796                 kill(pid, SIGHUP);
3797                 exit(EXIT_SUCCESS);
3798         }
3799 }
3800
3801 void
3802 cresize(int width, int height) {
3803         int col, row;
3804
3805         if(width != 0)
3806                 xw.w = width;
3807         if(height != 0)
3808                 xw.h = height;
3809
3810         col = (xw.w - 2 * borderpx) / xw.cw;
3811         row = (xw.h - 2 * borderpx) / xw.ch;
3812
3813         tresize(col, row);
3814         xresize(col, row);
3815         ttyresize();
3816 }
3817
3818 void
3819 resize(XEvent *e) {
3820         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3821                 return;
3822
3823         cresize(e->xconfigure.width, e->xconfigure.height);
3824 }
3825
3826 void
3827 run(void) {
3828         XEvent ev;
3829         int w = xw.w, h = xw.h;
3830         fd_set rfd;
3831         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3832         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3833         long deltatime;
3834
3835         /* Waiting for window mapping */
3836         while(1) {
3837                 XNextEvent(xw.dpy, &ev);
3838                 if(XFilterEvent(&ev, None))
3839                         continue;
3840                 if(ev.type == ConfigureNotify) {
3841                         w = ev.xconfigure.width;
3842                         h = ev.xconfigure.height;
3843                 } else if(ev.type == MapNotify) {
3844                         break;
3845                 }
3846         }
3847
3848         ttynew();
3849         cresize(w, h);
3850
3851         clock_gettime(CLOCK_MONOTONIC, &last);
3852         lastblink = last;
3853
3854         for(xev = actionfps;;) {
3855                 FD_ZERO(&rfd);
3856                 FD_SET(cmdfd, &rfd);
3857                 FD_SET(xfd, &rfd);
3858
3859                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3860                         if(errno == EINTR)
3861                                 continue;
3862                         die("select failed: %s\n", strerror(errno));
3863                 }
3864                 if(FD_ISSET(cmdfd, &rfd)) {
3865                         ttyread();
3866                         if(blinktimeout) {
3867                                 blinkset = tattrset(ATTR_BLINK);
3868                                 if(!blinkset)
3869                                         MODBIT(term.mode, 0, MODE_BLINK);
3870                         }
3871                 }
3872
3873                 if(FD_ISSET(xfd, &rfd))
3874                         xev = actionfps;
3875
3876                 clock_gettime(CLOCK_MONOTONIC, &now);
3877                 drawtimeout.tv_sec = 0;
3878                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3879                 tv = &drawtimeout;
3880
3881                 dodraw = 0;
3882                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3883                         tsetdirtattr(ATTR_BLINK);
3884                         term.mode ^= MODE_BLINK;
3885                         lastblink = now;
3886                         dodraw = 1;
3887                 }
3888                 deltatime = TIMEDIFF(now, last);
3889                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3890                                 || deltatime < 0) {
3891                         dodraw = 1;
3892                         last = now;
3893                 }
3894
3895                 if(dodraw) {
3896                         while(XPending(xw.dpy)) {
3897                                 XNextEvent(xw.dpy, &ev);
3898                                 if(XFilterEvent(&ev, None))
3899                                         continue;
3900                                 if(handler[ev.type])
3901                                         (handler[ev.type])(&ev);
3902                         }
3903
3904                         draw();
3905                         XFlush(xw.dpy);
3906
3907                         if(xev && !FD_ISSET(xfd, &rfd))
3908                                 xev--;
3909                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3910                                 if(blinkset) {
3911                                         if(TIMEDIFF(now, lastblink) \
3912                                                         > blinktimeout) {
3913                                                 drawtimeout.tv_nsec = 1000;
3914                                         } else {
3915                                                 drawtimeout.tv_nsec = (1E6 * \
3916                                                         (blinktimeout - \
3917                                                         TIMEDIFF(now,
3918                                                                 lastblink)));
3919                                         }
3920                                 } else {
3921                                         tv = NULL;
3922                                 }
3923                         }
3924                 }
3925         }
3926 }
3927
3928 void
3929 usage(void) {
3930         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3931         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3932         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3933 }
3934
3935 int
3936 main(int argc, char *argv[]) {
3937         char *titles;
3938         uint cols = 80, rows = 24;
3939
3940         xw.l = xw.t = 0;
3941         xw.isfixed = False;
3942
3943         ARGBEGIN {
3944         case 'a':
3945                 allowaltscreen = false;
3946                 break;
3947         case 'c':
3948                 opt_class = EARGF(usage());
3949                 break;
3950         case 'e':
3951                 /* eat all remaining arguments */
3952                 if(argc > 1) {
3953                         opt_cmd = &argv[1];
3954                         if(argv[1] != NULL && opt_title == NULL) {
3955                                 titles = xstrdup(argv[1]);
3956                                 opt_title = basename(titles);
3957                         }
3958                 }
3959                 goto run;
3960         case 'f':
3961                 opt_font = EARGF(usage());
3962                 break;
3963         case 'g':
3964                 xw.gm = XParseGeometry(EARGF(usage()),
3965                                 &xw.l, &xw.t, &cols, &rows);
3966                 break;
3967         case 'i':
3968                 xw.isfixed = True;
3969                 break;
3970         case 'o':
3971                 opt_io = EARGF(usage());
3972                 break;
3973         case 't':
3974                 opt_title = EARGF(usage());
3975                 break;
3976         case 'w':
3977                 opt_embed = EARGF(usage());
3978                 break;
3979         case 'v':
3980         default:
3981                 usage();
3982         } ARGEND;
3983
3984 run:
3985         setlocale(LC_CTYPE, "");
3986         XSetLocaleModifiers("");
3987         tnew(cols? cols : 1, rows? rows : 1);
3988         xinit();
3989         selinit();
3990         run();
3991
3992         return 0;
3993 }
3994