st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  80 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  81
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 #define VT102ID "\033[?6c"
  90
  91 enum glyph_attribute {
  92         ATTR_NULL      = 0,
  93         ATTR_BOLD      = 1,
  94         ATTR_FAINT     = 2,
  95         ATTR_ITALIC    = 4,
  96         ATTR_UNDERLINE = 8,
  97         ATTR_BLINK     = 16,
  98         ATTR_FASTBLINK = 32,
  99         ATTR_REVERSE   = 64,
 100         ATTR_INVISIBLE = 128,
 101         ATTR_STRUCK    = 256,
 102         ATTR_WRAP      = 512,
 103         ATTR_WIDE      = 1024,
 104         ATTR_WDUMMY    = 2048,
 105 };
 106
 107 enum cursor_movement {
 108         CURSOR_SAVE,
 109         CURSOR_LOAD
 110 };
 111
 112 enum cursor_state {
 113         CURSOR_DEFAULT  = 0,
 114         CURSOR_WRAPNEXT = 1,
 115         CURSOR_ORIGIN   = 2
 116 };
 117
 118 enum term_mode {
 119         MODE_WRAP        = 1,
 120         MODE_INSERT      = 2,
 121         MODE_APPKEYPAD   = 4,
 122         MODE_ALTSCREEN   = 8,
 123         MODE_CRLF        = 16,
 124         MODE_MOUSEBTN    = 32,
 125         MODE_MOUSEMOTION = 64,
 126         MODE_REVERSE     = 128,
 127         MODE_KBDLOCK     = 256,
 128         MODE_HIDE        = 512,
 129         MODE_ECHO        = 1024,
 130         MODE_APPCURSOR   = 2048,
 131         MODE_MOUSESGR    = 4096,
 132         MODE_8BIT        = 8192,
 133         MODE_BLINK       = 16384,
 134         MODE_FBLINK      = 32768,
 135         MODE_FOCUS       = 65536,
 136         MODE_MOUSEX10    = 131072,
 137         MODE_MOUSEMANY   = 262144,
 138         MODE_BRCKTPASTE  = 524288,
 139         MODE_PRINT       = 1048576,
 140         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 141                           |MODE_MOUSEMANY,
 142 };
 143
 144 enum charset {
 145         CS_GRAPHIC0,
 146         CS_GRAPHIC1,
 147         CS_UK,
 148         CS_USA,
 149         CS_MULTI,
 150         CS_GER,
 151         CS_FIN
 152 };
 153
 154 enum escape_state {
 155         ESC_START      = 1,
 156         ESC_CSI        = 2,
 157         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 158         ESC_ALTCHARSET = 8,
 159         ESC_STR_END    = 16, /* a final string was encountered */
 160         ESC_TEST       = 32, /* Enter in test mode */
 161 };
 162
 163 enum window_state {
 164         WIN_VISIBLE = 1,
 165         WIN_REDRAW  = 2,
 166         WIN_FOCUSED = 4
 167 };
 168
 169 enum selection_type {
 170         SEL_REGULAR = 1,
 171         SEL_RECTANGULAR = 2
 172 };
 173
 174 enum selection_snap {
 175         SNAP_WORD = 1,
 176         SNAP_LINE = 2
 177 };
 178
 179 typedef unsigned char uchar;
 180 typedef unsigned int uint;
 181 typedef unsigned long ulong;
 182 typedef unsigned short ushort;
 183
 184 typedef XftDraw *Draw;
 185 typedef XftColor Color;
 186
 187 typedef struct {
 188         char c[UTF_SIZ]; /* character code */
 189         ushort mode;      /* attribute flags */
 190         uint32_t fg;      /* foreground  */
 191         uint32_t bg;      /* background  */
 192 } Glyph;
 193
 194 typedef Glyph *Line;
 195
 196 typedef struct {
 197         Glyph attr; /* current char attributes */
 198         int x;
 199         int y;
 200         char state;
 201 } TCursor;
 202
 203 /* CSI Escape sequence structs */
 204 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 205 typedef struct {
 206         char buf[ESC_BUF_SIZ]; /* raw string */
 207         int len;               /* raw string length */
 208         char priv;
 209         int arg[ESC_ARG_SIZ];
 210         int narg;              /* nb of args */
 211         char mode;
 212 } CSIEscape;
 213
 214 /* STR Escape sequence structs */
 215 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 216 typedef struct {
 217         char type;             /* ESC type ... */
 218         char buf[STR_BUF_SIZ]; /* raw string */
 219         int len;               /* raw string length */
 220         char *args[STR_ARG_SIZ];
 221         int narg;              /* nb of args */
 222 } STREscape;
 223
 224 /* Internal representation of the screen */
 225 typedef struct {
 226         int row;      /* nb row */
 227         int col;      /* nb col */
 228         Line *line;   /* screen */
 229         Line *alt;    /* alternate screen */
 230         bool *dirty;  /* dirtyness of lines */
 231         TCursor c;    /* cursor */
 232         int top;      /* top    scroll limit */
 233         int bot;      /* bottom scroll limit */
 234         int mode;     /* terminal mode flags */
 235         int esc;      /* escape state flags */
 236         char trantbl[4]; /* charset table translation */
 237         int charset;  /* current charset */
 238         int icharset; /* selected charset for sequence */
 239         bool numlock; /* lock numbers in keyboard */
 240         bool *tabs;
 241 } Term;
 242
 243 /* Purely graphic info */
 244 typedef struct {
 245         Display *dpy;
 246         Colormap cmap;
 247         Window win;
 248         Drawable buf;
 249         Atom xembed, wmdeletewin, netwmname, netwmpid;
 250         XIM xim;
 251         XIC xic;
 252         Draw draw;
 253         Visual *vis;
 254         XSetWindowAttributes attrs;
 255         int scr;
 256         bool isfixed; /* is fixed geometry? */
 257         int l, t; /* left and top offset */
 258         int gm; /* geometry mask */
 259         int tw, th; /* tty width and height */
 260         int w, h; /* window width and height */
 261         int ch; /* char height */
 262         int cw; /* char width  */
 263         char state; /* focus, redraw, visible */
 264 } XWindow;
 265
 266 typedef struct {
 267         uint b;
 268         uint mask;
 269         char *s;
 270 } Mousekey;
 271
 272 typedef struct {
 273         KeySym k;
 274         uint mask;
 275         char *s;
 276         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 277         signed char appkey;    /* application keypad */
 278         signed char appcursor; /* application cursor */
 279         signed char crlf;      /* crlf mode          */
 280 } Key;
 281
 282 typedef struct {
 283         int mode;
 284         int type;
 285         int snap;
 286         /*
 287          * Selection variables:
 288          * nb – normalized coordinates of the beginning of the selection
 289          * ne – normalized coordinates of the end of the selection
 290          * ob – original coordinates of the beginning of the selection
 291          * oe – original coordinates of the end of the selection
 292          */
 293         struct {
 294                 int x, y;
 295         } nb, ne, ob, oe;
 296
 297         char *clip;
 298         Atom xtarget;
 299         bool alt;
 300         struct timespec tclick1;
 301         struct timespec tclick2;
 302 } Selection;
 303
 304 typedef union {
 305         int i;
 306         uint ui;
 307         float f;
 308         const void *v;
 309 } Arg;
 310
 311 typedef struct {
 312         uint mod;
 313         KeySym keysym;
 314         void (*func)(const Arg *);
 315         const Arg arg;
 316 } Shortcut;
 317
 318 /* function definitions used in config.h */
 319 static void clippaste(const Arg *);
 320 static void numlock(const Arg *);
 321 static void selpaste(const Arg *);
 322 static void xzoom(const Arg *);
 323 static void printsel(const Arg *);
 324 static void printscreen(const Arg *) ;
 325 static void toggleprinter(const Arg *);
 326
 327 /* Config.h for applying patches and the configuration. */
 328 #include "config.h"
 329
 330 /* Font structure */
 331 typedef struct {
 332         int height;
 333         int width;
 334         int ascent;
 335         int descent;
 336         short lbearing;
 337         short rbearing;
 338         XftFont *match;
 339         FcFontSet *set;
 340         FcPattern *pattern;
 341 } Font;
 342
 343 /* Drawing Context */
 344 typedef struct {
 345         Color col[MAX(LEN(colorname), 256)];
 346         Font font, bfont, ifont, ibfont;
 347         GC gc;
 348 } DC;
 349
 350 static void die(const char *, ...);
 351 static void draw(void);
 352 static void redraw(int);
 353 static void drawregion(int, int, int, int);
 354 static void execsh(void);
 355 static void sigchld(int);
 356 static void run(void);
 357
 358 static void csidump(void);
 359 static void csihandle(void);
 360 static void csiparse(void);
 361 static void csireset(void);
 362 static void strdump(void);
 363 static void strhandle(void);
 364 static void strparse(void);
 365 static void strreset(void);
 366
 367 static int tattrset(int);
 368 static void tprinter(char *, size_t);
 369 static void tdumpsel(void);
 370 static void tdumpline(int);
 371 static void tdump(void);
 372 static void tclearregion(int, int, int, int);
 373 static void tcursor(int);
 374 static void tdeletechar(int);
 375 static void tdeleteline(int);
 376 static void tinsertblank(int);
 377 static void tinsertblankline(int);
 378 static void tmoveto(int, int);
 379 static void tmoveato(int, int);
 380 static void tnew(int, int);
 381 static void tnewline(int);
 382 static void tputtab(int);
 383 static void tputc(char *, int);
 384 static void treset(void);
 385 static int tresize(int, int);
 386 static void tscrollup(int, int);
 387 static void tscrolldown(int, int);
 388 static void tsetattr(int *, int);
 389 static void tsetchar(char *, Glyph *, int, int);
 390 static void tsetscroll(int, int);
 391 static void tswapscreen(void);
 392 static void tsetdirt(int, int);
 393 static void tsetdirtattr(int);
 394 static void tsetmode(bool, bool, int *, int);
 395 static void tfulldirt(void);
 396 static void techo(char *, int);
 397 static void tcontrolcode(uchar );
 398 static void tdectest(char );
 399 static int32_t tdefcolor(int *, int *, int);
 400 static void tdeftran(char);
 401 static inline bool match(uint, uint);
 402 static void ttynew(void);
 403 static void ttyread(void);
 404 static void ttyresize(void);
 405 static void ttysend(char *, size_t);
 406 static void ttywrite(const char *, size_t);
 407
 408 static void xdraws(char *, Glyph, int, int, int, int);
 409 static void xhints(void);
 410 static void xclear(int, int, int, int);
 411 static void xdrawcursor(void);
 412 static void xinit(void);
 413 static void xloadcols(void);
 414 static int xsetcolorname(int, const char *);
 415 static int xgeommasktogravity(int);
 416 static int xloadfont(Font *, FcPattern *);
 417 static void xloadfonts(char *, double);
 418 static int xloadfontset(Font *);
 419 static void xsettitle(char *);
 420 static void xresettitle(void);
 421 static void xsetpointermotion(int);
 422 static void xseturgency(int);
 423 static void xsetsel(char *);
 424 static void xtermclear(int, int, int, int);
 425 static void xunloadfont(Font *);
 426 static void xunloadfonts(void);
 427 static void xresize(int, int);
 428
 429 static void expose(XEvent *);
 430 static void visibility(XEvent *);
 431 static void unmap(XEvent *);
 432 static char *kmap(KeySym, uint);
 433 static void kpress(XEvent *);
 434 static void cmessage(XEvent *);
 435 static void cresize(int, int);
 436 static void resize(XEvent *);
 437 static void focus(XEvent *);
 438 static void brelease(XEvent *);
 439 static void bpress(XEvent *);
 440 static void bmotion(XEvent *);
 441 static void selnotify(XEvent *);
 442 static void selclear(XEvent *);
 443 static void selrequest(XEvent *);
 444
 445 static void selinit(void);
 446 static void selnormalize(void);
 447 static inline bool selected(int, int);
 448 static char *getsel(void);
 449 static void selcopy(void);
 450 static void selscroll(int, int);
 451 static void selsnap(int, int *, int *, int);
 452 static void getbuttoninfo(XEvent *);
 453 static void mousereport(XEvent *);
 454
 455 static size_t utf8decode(char *, long *, size_t);
 456 static long utf8decodebyte(char, size_t *);
 457 static size_t utf8encode(long, char *, size_t);
 458 static char utf8encodebyte(long, size_t);
 459 static size_t utf8len(char *);
 460 static size_t utf8validate(long *, size_t);
 461
 462 static ssize_t xwrite(int, const char *, size_t);
 463 static void *xmalloc(size_t);
 464 static void *xrealloc(void *, size_t);
 465 static char *xstrdup(char *);
 466
 467 static void usage(void);
 468
 469 static void (*handler[LASTEvent])(XEvent *) = {
 470         [KeyPress] = kpress,
 471         [ClientMessage] = cmessage,
 472         [ConfigureNotify] = resize,
 473         [VisibilityNotify] = visibility,
 474         [UnmapNotify] = unmap,
 475         [Expose] = expose,
 476         [FocusIn] = focus,
 477         [FocusOut] = focus,
 478         [MotionNotify] = bmotion,
 479         [ButtonPress] = bpress,
 480         [ButtonRelease] = brelease,
 481         [SelectionClear] = selclear,
 482         [SelectionNotify] = selnotify,
 483         [SelectionRequest] = selrequest,
 484 };
 485
 486 /* Globals */
 487 static DC dc;
 488 static XWindow xw;
 489 static Term term;
 490 static CSIEscape csiescseq;
 491 static STREscape strescseq;
 492 static int cmdfd;
 493 static pid_t pid;
 494 static Selection sel;
 495 static int iofd = STDOUT_FILENO;
 496 static char **opt_cmd = NULL;
 497 static char *opt_io = NULL;
 498 static char *opt_title = NULL;
 499 static char *opt_embed = NULL;
 500 static char *opt_class = NULL;
 501 static char *opt_font = NULL;
 502 static int oldbutton = 3; /* button event on startup: 3 = release */
 503
 504 static char *usedfont = NULL;
 505 static double usedfontsize = 0;
 506
 507 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 508 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 509 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 510 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 511
 512 /* Font Ring Cache */
 513 enum {
 514         FRC_NORMAL,
 515         FRC_ITALIC,
 516         FRC_BOLD,
 517         FRC_ITALICBOLD
 518 };
 519
 520 typedef struct {
 521         XftFont *font;
 522         int flags;
 523 } Fontcache;
 524
 525 /* Fontcache is an array now. A new font will be appended to the array. */
 526 static Fontcache frc[16];
 527 static int frclen = 0;
 528
 529 ssize_t
 530 xwrite(int fd, const char *s, size_t len) {
 531         size_t aux = len;
 532
 533         while(len > 0) {
 534                 ssize_t r = write(fd, s, len);
 535                 if(r < 0)
 536                         return r;
 537                 len -= r;
 538                 s += r;
 539         }
 540         return aux;
 541 }
 542
 543 void *
 544 xmalloc(size_t len) {
 545         void *p = malloc(len);
 546
 547         if(!p)
 548                 die("Out of memory\n");
 549
 550         return p;
 551 }
 552
 553 void *
 554 xrealloc(void *p, size_t len) {
 555         if((p = realloc(p, len)) == NULL)
 556                 die("Out of memory\n");
 557
 558         return p;
 559 }
 560
 561 char *
 562 xstrdup(char *s) {
 563         if((s = strdup(s)) == NULL)
 564                 die("Out of memory\n");
 565
 566         return s;
 567 }
 568
 569 size_t
 570 utf8decode(char *c, long *u, size_t clen) {
 571         size_t i, j, len, type;
 572         long udecoded;
 573
 574         *u = UTF_INVALID;
 575         if(!clen)
 576                 return 0;
 577         udecoded = utf8decodebyte(c[0], &len);
 578         if(!BETWEEN(len, 1, UTF_SIZ))
 579                 return 1;
 580         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 581                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 582                 if(type != 0)
 583                         return j;
 584         }
 585         if(j < len)
 586                 return 0;
 587         *u = udecoded;
 588         utf8validate(u, len);
 589         return len;
 590 }
 591
 592 long
 593 utf8decodebyte(char c, size_t *i) {
 594         for(*i = 0; *i < LEN(utfmask); ++(*i))
 595                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 596                         return (uchar)c & ~utfmask[*i];
 597         return 0;
 598 }
 599
 600 size_t
 601 utf8encode(long u, char *c, size_t clen) {
 602         size_t len, i;
 603
 604         len = utf8validate(&u, 0);
 605         if(clen < len)
 606                 return 0;
 607         for(i = len - 1; i != 0; --i) {
 608                 c[i] = utf8encodebyte(u, 0);
 609                 u >>= 6;
 610         }
 611         c[0] = utf8encodebyte(u, len);
 612         return len;
 613 }
 614
 615 char
 616 utf8encodebyte(long u, size_t i) {
 617         return utfbyte[i] | (u & ~utfmask[i]);
 618 }
 619
 620 size_t
 621 utf8len(char *c) {
 622         return utf8decode(c, &(long){0}, UTF_SIZ);
 623 }
 624
 625 size_t
 626 utf8validate(long *u, size_t i) {
 627         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 628                 *u = UTF_INVALID;
 629         for(i = 1; *u > utfmax[i]; ++i)
 630                 ;
 631         return i;
 632 }
 633
 634 static void
 635 selinit(void) {
 636         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 637         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 638         sel.mode = 0;
 639         sel.ob.x = -1;
 640         sel.clip = NULL;
 641         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 642         if(sel.xtarget == None)
 643                 sel.xtarget = XA_STRING;
 644 }
 645
 646 static int
 647 x2col(int x) {
 648         x -= borderpx;
 649         x /= xw.cw;
 650
 651         return LIMIT(x, 0, term.col-1);
 652 }
 653
 654 static int
 655 y2row(int y) {
 656         y -= borderpx;
 657         y /= xw.ch;
 658
 659         return LIMIT(y, 0, term.row-1);
 660 }
 661
 662 static int tlinelen(int y) {
 663         int i = term.col;
 664
 665         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 666                 --i;
 667
 668         return i;
 669 }
 670
 671 static void
 672 selnormalize(void) {
 673         int i;
 674
 675         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 676                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 677                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 678         } else {
 679                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 680                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 681         }
 682         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 683         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 684
 685         /* expand selection over line breaks */
 686         if (sel.type == SEL_RECTANGULAR)
 687                 return;
 688         i = tlinelen(sel.nb.y);
 689         if (i < sel.nb.x)
 690                 sel.nb.x = i;
 691         if (tlinelen(sel.ne.y) <= sel.ne.x)
 692                 sel.ne.x = term.col - 1;
 693 }
 694
 695 static inline bool
 696 selected(int x, int y) {
 697         if(sel.type == SEL_RECTANGULAR)
 698                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 699                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 700
 701         return BETWEEN(y, sel.nb.y, sel.ne.y)
 702             && (y != sel.nb.y || x >= sel.nb.x)
 703             && (y != sel.ne.y || x <= sel.ne.x);
 704 }
 705
 706 void
 707 selsnap(int mode, int *x, int *y, int direction) {
 708         int newx, newy, xt, yt;
 709         Glyph *gp;
 710
 711         switch(mode) {
 712         case SNAP_WORD:
 713                 /*
 714                  * Snap around if the word wraps around at the end or
 715                  * beginning of a line.
 716                  */
 717                 for(;;) {
 718                         newx = *x + direction;
 719                         newy = *y;
 720                         if(!BETWEEN(newx, 0, term.col - 1)) {
 721                                 newy += direction;
 722                                 newx = (newx + term.col) % term.col;
 723                                 if (!BETWEEN(newy, 0, term.row - 1))
 724                                         break;
 725
 726                                 if(direction > 0)
 727                                         yt = *y, xt = *x;
 728                                 else
 729                                         yt = newy, xt = newx;
 730                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 731                                         break;
 732                         }
 733
 734                         if (newx >= tlinelen(newy))
 735                                 break;
 736
 737                         gp = &term.line[newy][newx];
 738                         if (!(gp->mode & ATTR_WDUMMY) && strchr(worddelimiters, gp->c[0]))
 739                                 break;
 740
 741                         *x = newx;
 742                         *y = newy;
 743                 }
 744                 break;
 745         case SNAP_LINE:
 746                 /*
 747                  * Snap around if the the previous line or the current one
 748                  * has set ATTR_WRAP at its end. Then the whole next or
 749                  * previous line will be selected.
 750                  */
 751                 *x = (direction < 0) ? 0 : term.col - 1;
 752                 if(direction < 0 && *y > 0) {
 753                         for(; *y > 0; *y += direction) {
 754                                 if(!(term.line[*y-1][term.col-1].mode
 755                                                 & ATTR_WRAP)) {
 756                                         break;
 757                                 }
 758                         }
 759                 } else if(direction > 0 && *y < term.row-1) {
 760                         for(; *y < term.row; *y += direction) {
 761                                 if(!(term.line[*y][term.col-1].mode
 762                                                 & ATTR_WRAP)) {
 763                                         break;
 764                                 }
 765                         }
 766                 }
 767                 break;
 768         }
 769 }
 770
 771 void
 772 getbuttoninfo(XEvent *e) {
 773         int type;
 774         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 775
 776         sel.alt = IS_SET(MODE_ALTSCREEN);
 777
 778         sel.oe.x = x2col(e->xbutton.x);
 779         sel.oe.y = y2row(e->xbutton.y);
 780
 781         if(sel.ob.y < sel.oe.y
 782                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 783                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 784                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 785         } else {
 786                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 787                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 788         }
 789         selnormalize();
 790
 791         sel.type = SEL_REGULAR;
 792         for(type = 1; type < LEN(selmasks); ++type) {
 793                 if(match(selmasks[type], state)) {
 794                         sel.type = type;
 795                         break;
 796                 }
 797         }
 798 }
 799
 800 void
 801 mousereport(XEvent *e) {
 802         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 803             button = e->xbutton.button, state = e->xbutton.state,
 804             len;
 805         char buf[40];
 806         static int ox, oy;
 807
 808         /* from urxvt */
 809         if(e->xbutton.type == MotionNotify) {
 810                 if(x == ox && y == oy)
 811                         return;
 812                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 813                         return;
 814                 /* MOUSE_MOTION: no reporting if no button is pressed */
 815                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 816                         return;
 817
 818                 button = oldbutton + 32;
 819                 ox = x;
 820                 oy = y;
 821         } else {
 822                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 823                         button = 3;
 824                 } else {
 825                         button -= Button1;
 826                         if(button >= 3)
 827                                 button += 64 - 3;
 828                 }
 829                 if(e->xbutton.type == ButtonPress) {
 830                         oldbutton = button;
 831                         ox = x;
 832                         oy = y;
 833                 } else if(e->xbutton.type == ButtonRelease) {
 834                         oldbutton = 3;
 835                         /* MODE_MOUSEX10: no button release reporting */
 836                         if(IS_SET(MODE_MOUSEX10))
 837                                 return;
 838                         if (button == 64 || button == 65)
 839                                 return;
 840                 }
 841         }
 842
 843         if(!IS_SET(MODE_MOUSEX10)) {
 844                 button += (state & ShiftMask   ? 4  : 0)
 845                         + (state & Mod4Mask    ? 8  : 0)
 846                         + (state & ControlMask ? 16 : 0);
 847         }
 848
 849         len = 0;
 850         if(IS_SET(MODE_MOUSESGR)) {
 851                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 852                                 button, x+1, y+1,
 853                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 854         } else if(x < 223 && y < 223) {
 855                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 856                                 32+button, 32+x+1, 32+y+1);
 857         } else {
 858                 return;
 859         }
 860
 861         ttywrite(buf, len);
 862 }
 863
 864 void
 865 bpress(XEvent *e) {
 866         struct timespec now;
 867         Mousekey *mk;
 868
 869         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 870                 mousereport(e);
 871                 return;
 872         }
 873
 874         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 875                 if(e->xbutton.button == mk->b
 876                                 && match(mk->mask, e->xbutton.state)) {
 877                         ttysend(mk->s, strlen(mk->s));
 878                         return;
 879                 }
 880         }
 881
 882         if(e->xbutton.button == Button1) {
 883                 clock_gettime(CLOCK_MONOTONIC, &now);
 884
 885                 /* Clear previous selection, logically and visually. */
 886                 selclear(NULL);
 887                 sel.mode = 1;
 888                 sel.type = SEL_REGULAR;
 889                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 890                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 891
 892                 /*
 893                  * If the user clicks below predefined timeouts specific
 894                  * snapping behaviour is exposed.
 895                  */
 896                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 897                         sel.snap = SNAP_LINE;
 898                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 899                         sel.snap = SNAP_WORD;
 900                 } else {
 901                         sel.snap = 0;
 902                 }
 903                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 904                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 905                 selnormalize();
 906
 907                 /*
 908                  * Draw selection, unless it's regular and we don't want to
 909                  * make clicks visible
 910                  */
 911                 if(sel.snap != 0) {
 912                         sel.mode++;
 913                         tsetdirt(sel.nb.y, sel.ne.y);
 914                 }
 915                 sel.tclick2 = sel.tclick1;
 916                 sel.tclick1 = now;
 917         }
 918 }
 919
 920 char *
 921 getsel(void) {
 922         char *str, *ptr;
 923         int x, y, bufsize, size, ex;
 924         Glyph *gp, *last;
 925
 926         if(sel.ob.x == -1)
 927                 return NULL;
 928
 929         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 930         ptr = str = xmalloc(bufsize);
 931
 932         /* append every set & selected glyph to the selection */
 933         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 934                 gp = &term.line[y][0];
 935                 last = &gp[term.col-1];
 936
 937                 while(last >= gp && !(selected(last - gp, y) &&
 938                                       strcmp(last->c, " ") != 0)) {
 939                         --last;
 940                 }
 941
 942                 for(x = 0; gp <= last; x++, ++gp) {
 943                         if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 944                                 continue;
 945
 946                         size = utf8len(gp->c);
 947                         memcpy(ptr, gp->c, size);
 948                         ptr += size;
 949                 }
 950
 951                 /*
 952                  * Copy and pasting of line endings is inconsistent
 953                  * in the inconsistent terminal and GUI world.
 954                  * The best solution seems like to produce '\n' when
 955                  * something is copied from st and convert '\n' to
 956                  * '\r', when something to be pasted is received by
 957                  * st.
 958                  * FIXME: Fix the computer world.
 959                  */
 960                 if(y < sel.ne.y && !(x > 0 && (gp-1)->mode & ATTR_WRAP))
 961                         *ptr++ = '\n';
 962
 963                 /*
 964                  * If the last selected line expands in the selection
 965                  * after the visible text '\n' is appended.
 966                  */
 967                 if(y == sel.ne.y) {
 968                         ex = sel.ne.x;
 969                         if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 970                                 ex = sel.nb.x;
 971                         if(tlinelen(y) < ex)
 972                                 *ptr++ = '\n';
 973                 }
 974         }
 975         *ptr = 0;
 976         return str;
 977 }
 978
 979 void
 980 selcopy(void) {
 981         xsetsel(getsel());
 982 }
 983
 984 void
 985 selnotify(XEvent *e) {
 986         ulong nitems, ofs, rem;
 987         int format;
 988         uchar *data, *last, *repl;
 989         Atom type;
 990
 991         ofs = 0;
 992         do {
 993                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 994                                         False, AnyPropertyType, &type, &format,
 995                                         &nitems, &rem, &data)) {
 996                         fprintf(stderr, "Clipboard allocation failed\n");
 997                         return;
 998                 }
 999
1000                 /*
1001                  * As seen in getsel:
1002                  * Line endings are inconsistent in the terminal and GUI world
1003                  * copy and pasting. When receiving some selection data,
1004                  * replace all '\n' with '\r'.
1005                  * FIXME: Fix the computer world.
1006                  */
1007                 repl = data;
1008                 last = data + nitems * format / 8;
1009                 while((repl = memchr(repl, '\n', last - repl))) {
1010                         *repl++ = '\r';
1011                 }
1012
1013                 if(IS_SET(MODE_BRCKTPASTE))
1014                         ttywrite("\033[200~", 6);
1015                 ttysend((char *)data, nitems * format / 8);
1016                 if(IS_SET(MODE_BRCKTPASTE))
1017                         ttywrite("\033[201~", 6);
1018                 XFree(data);
1019                 /* number of 32-bit chunks returned */
1020                 ofs += nitems * format / 32;
1021         } while(rem > 0);
1022 }
1023
1024 void
1025 selpaste(const Arg *dummy) {
1026         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1027                         xw.win, CurrentTime);
1028 }
1029
1030 void
1031 clippaste(const Arg *dummy) {
1032         Atom clipboard;
1033
1034         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1035         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1036                         xw.win, CurrentTime);
1037 }
1038
1039 void
1040 selclear(XEvent *e) {
1041         if(sel.ob.x == -1)
1042                 return;
1043         sel.ob.x = -1;
1044         tsetdirt(sel.nb.y, sel.ne.y);
1045 }
1046
1047 void
1048 selrequest(XEvent *e) {
1049         XSelectionRequestEvent *xsre;
1050         XSelectionEvent xev;
1051         Atom xa_targets, string;
1052
1053         xsre = (XSelectionRequestEvent *) e;
1054         xev.type = SelectionNotify;
1055         xev.requestor = xsre->requestor;
1056         xev.selection = xsre->selection;
1057         xev.target = xsre->target;
1058         xev.time = xsre->time;
1059         /* reject */
1060         xev.property = None;
1061
1062         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1063         if(xsre->target == xa_targets) {
1064                 /* respond with the supported type */
1065                 string = sel.xtarget;
1066                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1067                                 XA_ATOM, 32, PropModeReplace,
1068                                 (uchar *) &string, 1);
1069                 xev.property = xsre->property;
1070         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1071                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1072                                 xsre->target, 8, PropModeReplace,
1073                                 (uchar *) sel.clip, strlen(sel.clip));
1074                 xev.property = xsre->property;
1075         }
1076
1077         /* all done, send a notification to the listener */
1078         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1079                 fprintf(stderr, "Error sending SelectionNotify event\n");
1080 }
1081
1082 void
1083 xsetsel(char *str) {
1084         /* register the selection for both the clipboard and the primary */
1085         Atom clipboard;
1086
1087         free(sel.clip);
1088         sel.clip = str;
1089
1090         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1091
1092         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1093         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1094 }
1095
1096 void
1097 brelease(XEvent *e) {
1098         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1099                 mousereport(e);
1100                 return;
1101         }
1102
1103         if(e->xbutton.button == Button2) {
1104                 selpaste(NULL);
1105         } else if(e->xbutton.button == Button1) {
1106                 if(sel.mode < 2) {
1107                         selclear(NULL);
1108                 } else {
1109                         getbuttoninfo(e);
1110                         selcopy();
1111                 }
1112                 sel.mode = 0;
1113                 tsetdirt(sel.nb.y, sel.ne.y);
1114         }
1115 }
1116
1117 void
1118 bmotion(XEvent *e) {
1119         int oldey, oldex, oldsby, oldsey;
1120
1121         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1122                 mousereport(e);
1123                 return;
1124         }
1125
1126         if(!sel.mode)
1127                 return;
1128
1129         sel.mode++;
1130         oldey = sel.oe.y;
1131         oldex = sel.oe.x;
1132         oldsby = sel.nb.y;
1133         oldsey = sel.ne.y;
1134         getbuttoninfo(e);
1135
1136         if(oldey != sel.oe.y || oldex != sel.oe.x)
1137                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1138 }
1139
1140 void
1141 die(const char *errstr, ...) {
1142         va_list ap;
1143
1144         va_start(ap, errstr);
1145         vfprintf(stderr, errstr, ap);
1146         va_end(ap);
1147         exit(EXIT_FAILURE);
1148 }
1149
1150 void
1151 execsh(void) {
1152         char **args;
1153         char *envshell = getenv("SHELL");
1154         const struct passwd *pass = getpwuid(getuid());
1155         char buf[sizeof(long) * 8 + 1];
1156
1157         unsetenv("COLUMNS");
1158         unsetenv("LINES");
1159         unsetenv("TERMCAP");
1160
1161         if(pass) {
1162                 setenv("LOGNAME", pass->pw_name, 1);
1163                 setenv("USER", pass->pw_name, 1);
1164                 setenv("SHELL", pass->pw_shell, 0);
1165                 setenv("HOME", pass->pw_dir, 0);
1166         }
1167
1168         snprintf(buf, sizeof(buf), "%lu", xw.win);
1169         setenv("WINDOWID", buf, 1);
1170
1171         signal(SIGCHLD, SIG_DFL);
1172         signal(SIGHUP, SIG_DFL);
1173         signal(SIGINT, SIG_DFL);
1174         signal(SIGQUIT, SIG_DFL);
1175         signal(SIGTERM, SIG_DFL);
1176         signal(SIGALRM, SIG_DFL);
1177
1178         DEFAULT(envshell, shell);
1179         setenv("TERM", termname, 1);
1180         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1181         execvp(args[0], args);
1182         exit(EXIT_FAILURE);
1183 }
1184
1185 void
1186 sigchld(int a) {
1187         int stat = 0;
1188
1189         if(waitpid(pid, &stat, 0) < 0)
1190                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1191
1192         if(WIFEXITED(stat)) {
1193                 exit(WEXITSTATUS(stat));
1194         } else {
1195                 exit(EXIT_FAILURE);
1196         }
1197 }
1198
1199 void
1200 ttynew(void) {
1201         int m, s;
1202         struct winsize w = {term.row, term.col, 0, 0};
1203
1204         /* seems to work fine on linux, openbsd and freebsd */
1205         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1206                 die("openpty failed: %s\n", strerror(errno));
1207
1208         switch(pid = fork()) {
1209         case -1:
1210                 die("fork failed\n");
1211                 break;
1212         case 0:
1213                 setsid(); /* create a new process group */
1214                 dup2(s, STDIN_FILENO);
1215                 dup2(s, STDOUT_FILENO);
1216                 dup2(s, STDERR_FILENO);
1217                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1218                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1219                 close(s);
1220                 close(m);
1221                 execsh();
1222                 break;
1223         default:
1224                 close(s);
1225                 cmdfd = m;
1226                 signal(SIGCHLD, sigchld);
1227                 if(opt_io) {
1228                         term.mode |= MODE_PRINT;
1229                         iofd = (!strcmp(opt_io, "-")) ?
1230                                   STDOUT_FILENO :
1231                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1232                         if(iofd < 0) {
1233                                 fprintf(stderr, "Error opening %s:%s\n",
1234                                         opt_io, strerror(errno));
1235                         }
1236                 }
1237                 break;
1238         }
1239 }
1240
1241 void
1242 ttyread(void) {
1243         static char buf[BUFSIZ];
1244         static int buflen = 0;
1245         char *ptr;
1246         char s[UTF_SIZ];
1247         int charsize; /* size of utf8 char in bytes */
1248         long unicodep;
1249         int ret;
1250
1251         /* append read bytes to unprocessed bytes */
1252         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1253                 die("Couldn't read from shell: %s\n", strerror(errno));
1254
1255         /* process every complete utf8 char */
1256         buflen += ret;
1257         ptr = buf;
1258         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1259                 utf8encode(unicodep, s, UTF_SIZ);
1260                 tputc(s, charsize);
1261                 ptr += charsize;
1262                 buflen -= charsize;
1263         }
1264
1265         /* keep any uncomplete utf8 char for the next call */
1266         memmove(buf, ptr, buflen);
1267 }
1268
1269 void
1270 ttywrite(const char *s, size_t n) {
1271         if(xwrite(cmdfd, s, n) == -1)
1272                 die("write error on tty: %s\n", strerror(errno));
1273 }
1274
1275 void
1276 ttysend(char *s, size_t n) {
1277         ttywrite(s, n);
1278         if(IS_SET(MODE_ECHO))
1279                 techo(s, n);
1280 }
1281
1282 void
1283 ttyresize(void) {
1284         struct winsize w;
1285
1286         w.ws_row = term.row;
1287         w.ws_col = term.col;
1288         w.ws_xpixel = xw.tw;
1289         w.ws_ypixel = xw.th;
1290         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1291                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1292 }
1293
1294 int
1295 tattrset(int attr) {
1296         int i, j;
1297
1298         for(i = 0; i < term.row-1; i++) {
1299                 for(j = 0; j < term.col-1; j++) {
1300                         if(term.line[i][j].mode & attr)
1301                                 return 1;
1302                 }
1303         }
1304
1305         return 0;
1306 }
1307
1308 void
1309 tsetdirt(int top, int bot) {
1310         int i;
1311
1312         LIMIT(top, 0, term.row-1);
1313         LIMIT(bot, 0, term.row-1);
1314
1315         for(i = top; i <= bot; i++)
1316                 term.dirty[i] = 1;
1317 }
1318
1319 void
1320 tsetdirtattr(int attr) {
1321         int i, j;
1322
1323         for(i = 0; i < term.row-1; i++) {
1324                 for(j = 0; j < term.col-1; j++) {
1325                         if(term.line[i][j].mode & attr) {
1326                                 tsetdirt(i, i);
1327                                 break;
1328                         }
1329                 }
1330         }
1331 }
1332
1333 void
1334 tfulldirt(void) {
1335         tsetdirt(0, term.row-1);
1336 }
1337
1338 void
1339 tcursor(int mode) {
1340         static TCursor c[2];
1341         bool alt = IS_SET(MODE_ALTSCREEN);
1342
1343         if(mode == CURSOR_SAVE) {
1344                 c[alt] = term.c;
1345         } else if(mode == CURSOR_LOAD) {
1346                 term.c = c[alt];
1347                 tmoveto(c[alt].x, c[alt].y);
1348         }
1349 }
1350
1351 void
1352 treset(void) {
1353         uint i;
1354
1355         term.c = (TCursor){{
1356                 .mode = ATTR_NULL,
1357                 .fg = defaultfg,
1358                 .bg = defaultbg
1359         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1360
1361         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1362         for(i = tabspaces; i < term.col; i += tabspaces)
1363                 term.tabs[i] = 1;
1364         term.top = 0;
1365         term.bot = term.row - 1;
1366         term.mode = MODE_WRAP;
1367         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1368         term.charset = 0;
1369
1370         tclearregion(0, 0, term.col-1, term.row-1);
1371         tmoveto(0, 0);
1372         tcursor(CURSOR_SAVE);
1373 }
1374
1375 void
1376 tnew(int col, int row) {
1377         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1378         tresize(col, row);
1379         term.numlock = 1;
1380
1381         treset();
1382 }
1383
1384 void
1385 tswapscreen(void) {
1386         Line *tmp = term.line;
1387
1388         term.line = term.alt;
1389         term.alt = tmp;
1390         term.mode ^= MODE_ALTSCREEN;
1391         tfulldirt();
1392 }
1393
1394 void
1395 tscrolldown(int orig, int n) {
1396         int i;
1397         Line temp;
1398
1399         LIMIT(n, 0, term.bot-orig+1);
1400
1401         tsetdirt(orig, term.bot-n);
1402         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1403
1404         for(i = term.bot; i >= orig+n; i--) {
1405                 temp = term.line[i];
1406                 term.line[i] = term.line[i-n];
1407                 term.line[i-n] = temp;
1408         }
1409
1410         selscroll(orig, n);
1411 }
1412
1413 void
1414 tscrollup(int orig, int n) {
1415         int i;
1416         Line temp;
1417
1418         LIMIT(n, 0, term.bot-orig+1);
1419
1420         tclearregion(0, orig, term.col-1, orig+n-1);
1421         tsetdirt(orig+n, term.bot);
1422
1423         for(i = orig; i <= term.bot-n; i++) {
1424                 temp = term.line[i];
1425                 term.line[i] = term.line[i+n];
1426                 term.line[i+n] = temp;
1427         }
1428
1429         selscroll(orig, -n);
1430 }
1431
1432 void
1433 selscroll(int orig, int n) {
1434         if(sel.ob.x == -1)
1435                 return;
1436
1437         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1438                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1439                         selclear(NULL);
1440                         return;
1441                 }
1442                 if(sel.type == SEL_RECTANGULAR) {
1443                         if(sel.ob.y < term.top)
1444                                 sel.ob.y = term.top;
1445                         if(sel.oe.y > term.bot)
1446                                 sel.oe.y = term.bot;
1447                 } else {
1448                         if(sel.ob.y < term.top) {
1449                                 sel.ob.y = term.top;
1450                                 sel.ob.x = 0;
1451                         }
1452                         if(sel.oe.y > term.bot) {
1453                                 sel.oe.y = term.bot;
1454                                 sel.oe.x = term.col;
1455                         }
1456                 }
1457                 selnormalize();
1458         }
1459 }
1460
1461 void
1462 tnewline(int first_col) {
1463         int y = term.c.y;
1464
1465         if(y == term.bot) {
1466                 tscrollup(term.top, 1);
1467         } else {
1468                 y++;
1469         }
1470         tmoveto(first_col ? 0 : term.c.x, y);
1471 }
1472
1473 void
1474 csiparse(void) {
1475         char *p = csiescseq.buf, *np;
1476         long int v;
1477
1478         csiescseq.narg = 0;
1479         if(*p == '?') {
1480                 csiescseq.priv = 1;
1481                 p++;
1482         }
1483
1484         csiescseq.buf[csiescseq.len] = '\0';
1485         while(p < csiescseq.buf+csiescseq.len) {
1486                 np = NULL;
1487                 v = strtol(p, &np, 10);
1488                 if(np == p)
1489                         v = 0;
1490                 if(v == LONG_MAX || v == LONG_MIN)
1491                         v = -1;
1492                 csiescseq.arg[csiescseq.narg++] = v;
1493                 p = np;
1494                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1495                         break;
1496                 p++;
1497         }
1498         csiescseq.mode = *p;
1499 }
1500
1501 /* for absolute user moves, when decom is set */
1502 void
1503 tmoveato(int x, int y) {
1504         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1505 }
1506
1507 void
1508 tmoveto(int x, int y) {
1509         int miny, maxy;
1510
1511         if(term.c.state & CURSOR_ORIGIN) {
1512                 miny = term.top;
1513                 maxy = term.bot;
1514         } else {
1515                 miny = 0;
1516                 maxy = term.row - 1;
1517         }
1518         LIMIT(x, 0, term.col-1);
1519         LIMIT(y, miny, maxy);
1520         term.c.state &= ~CURSOR_WRAPNEXT;
1521         term.c.x = x;
1522         term.c.y = y;
1523 }
1524
1525 void
1526 tsetchar(char *c, Glyph *attr, int x, int y) {
1527         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1528                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1529                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1530                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1531                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1532                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1533                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1534                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1535                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1536         };
1537
1538         /*
1539          * The table is proudly stolen from rxvt.
1540          */
1541         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1542                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1543                         c = vt100_0[c[0] - 0x41];
1544                 }
1545         }
1546
1547         if(term.line[y][x].mode & ATTR_WIDE) {
1548                 if(x+1 < term.col) {
1549                         term.line[y][x+1].c[0] = ' ';
1550                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1551                 }
1552         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1553                 term.line[y][x-1].c[0] = ' ';
1554                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1555         }
1556
1557         term.dirty[y] = 1;
1558         term.line[y][x] = *attr;
1559         memcpy(term.line[y][x].c, c, UTF_SIZ);
1560 }
1561
1562 void
1563 tclearregion(int x1, int y1, int x2, int y2) {
1564         int x, y, temp;
1565
1566         if(x1 > x2)
1567                 temp = x1, x1 = x2, x2 = temp;
1568         if(y1 > y2)
1569                 temp = y1, y1 = y2, y2 = temp;
1570
1571         LIMIT(x1, 0, term.col-1);
1572         LIMIT(x2, 0, term.col-1);
1573         LIMIT(y1, 0, term.row-1);
1574         LIMIT(y2, 0, term.row-1);
1575
1576         for(y = y1; y <= y2; y++) {
1577                 term.dirty[y] = 1;
1578                 for(x = x1; x <= x2; x++) {
1579                         if(selected(x, y))
1580                                 selclear(NULL);
1581                         term.line[y][x] = term.c.attr;
1582                         memcpy(term.line[y][x].c, " ", 2);
1583                 }
1584         }
1585 }
1586
1587 void
1588 tdeletechar(int n) {
1589         int dst, src, size;
1590         Glyph *line;
1591
1592         LIMIT(n, 0, term.col - term.c.x);
1593
1594         dst = term.c.x;
1595         src = term.c.x + n;
1596         size = term.col - src;
1597         line = term.line[term.c.y];
1598
1599         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1600         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1601 }
1602
1603 void
1604 tinsertblank(int n) {
1605         int dst, src, size;
1606         Glyph *line;
1607
1608         LIMIT(n, 0, term.col - term.c.x);
1609
1610         dst = term.c.x + n;
1611         src = term.c.x;
1612         size = term.col - dst;
1613         line = term.line[term.c.y];
1614
1615         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1616         tclearregion(src, term.c.y, dst - 1, term.c.y);
1617 }
1618
1619 void
1620 tinsertblankline(int n) {
1621         if(BETWEEN(term.c.y, term.top, term.bot))
1622                 tscrolldown(term.c.y, n);
1623 }
1624
1625 void
1626 tdeleteline(int n) {
1627         if(BETWEEN(term.c.y, term.top, term.bot))
1628                 tscrollup(term.c.y, n);
1629 }
1630
1631 int32_t
1632 tdefcolor(int *attr, int *npar, int l) {
1633         int32_t idx = -1;
1634         uint r, g, b;
1635
1636         switch (attr[*npar + 1]) {
1637         case 2: /* direct color in RGB space */
1638                 if (*npar + 4 >= l) {
1639                         fprintf(stderr,
1640                                 "erresc(38): Incorrect number of parameters (%d)\n",
1641                                 *npar);
1642                         break;
1643                 }
1644                 r = attr[*npar + 2];
1645                 g = attr[*npar + 3];
1646                 b = attr[*npar + 4];
1647                 *npar += 4;
1648                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1649                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1650                                 r, g, b);
1651                 else
1652                         idx = TRUECOLOR(r, g, b);
1653                 break;
1654         case 5: /* indexed color */
1655                 if (*npar + 2 >= l) {
1656                         fprintf(stderr,
1657                                 "erresc(38): Incorrect number of parameters (%d)\n",
1658                                 *npar);
1659                         break;
1660                 }
1661                 *npar += 2;
1662                 if(!BETWEEN(attr[*npar], 0, 255))
1663                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1664                 else
1665                         idx = attr[*npar];
1666                 break;
1667         case 0: /* implemented defined (only foreground) */
1668         case 1: /* transparent */
1669         case 3: /* direct color in CMY space */
1670         case 4: /* direct color in CMYK space */
1671         default:
1672                 fprintf(stderr,
1673                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1674                 break;
1675         }
1676
1677         return idx;
1678 }
1679
1680 void
1681 tsetattr(int *attr, int l) {
1682         int i;
1683         int32_t idx;
1684
1685         for(i = 0; i < l; i++) {
1686                 switch(attr[i]) {
1687                 case 0:
1688                         term.c.attr.mode &= ~(
1689                                 ATTR_BOLD       |
1690                                 ATTR_FAINT      |
1691                                 ATTR_ITALIC     |
1692                                 ATTR_UNDERLINE  |
1693                                 ATTR_BLINK      |
1694                                 ATTR_FASTBLINK  |
1695                                 ATTR_REVERSE    |
1696                                 ATTR_INVISIBLE  |
1697                                 ATTR_STRUCK     );
1698                         term.c.attr.fg = defaultfg;
1699                         term.c.attr.bg = defaultbg;
1700                         break;
1701                 case 1:
1702                         term.c.attr.mode |= ATTR_BOLD;
1703                         break;
1704                 case 2:
1705                         term.c.attr.mode |= ATTR_FAINT;
1706                         break;
1707                 case 3:
1708                         term.c.attr.mode |= ATTR_ITALIC;
1709                         break;
1710                 case 4:
1711                         term.c.attr.mode |= ATTR_UNDERLINE;
1712                         break;
1713                 case 5: /* slow blink */
1714                         term.c.attr.mode |= ATTR_BLINK;
1715                         break;
1716                 case 6: /* rapid blink */
1717                         term.c.attr.mode |= ATTR_FASTBLINK;
1718                         break;
1719                 case 7:
1720                         term.c.attr.mode |= ATTR_REVERSE;
1721                         break;
1722                 case 8:
1723                         term.c.attr.mode |= ATTR_INVISIBLE;
1724                         break;
1725                 case 9:
1726                         term.c.attr.mode |= ATTR_STRUCK;
1727                         break;
1728                 case 21:
1729                         term.c.attr.mode &= ~ATTR_BOLD;
1730                         break;
1731                 case 22:
1732                         term.c.attr.mode &= ~ATTR_FAINT;
1733                         break;
1734                 case 23:
1735                         term.c.attr.mode &= ~ATTR_ITALIC;
1736                         break;
1737                 case 24:
1738                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1739                         break;
1740                 case 25:
1741                         term.c.attr.mode &= ~ATTR_BLINK;
1742                         break;
1743                 case 26:
1744                         term.c.attr.mode &= ~ATTR_FASTBLINK;
1745                         break;
1746                 case 27:
1747                         term.c.attr.mode &= ~ATTR_REVERSE;
1748                         break;
1749                 case 28:
1750                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1751                         break;
1752                 case 29:
1753                         term.c.attr.mode &= ~ATTR_STRUCK;
1754                         break;
1755                 case 38:
1756                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1757                                 term.c.attr.fg = idx;
1758                         break;
1759                 case 39:
1760                         term.c.attr.fg = defaultfg;
1761                         break;
1762                 case 48:
1763                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1764                                 term.c.attr.bg = idx;
1765                         break;
1766                 case 49:
1767                         term.c.attr.bg = defaultbg;
1768                         break;
1769                 default:
1770                         if(BETWEEN(attr[i], 30, 37)) {
1771                                 term.c.attr.fg = attr[i] - 30;
1772                         } else if(BETWEEN(attr[i], 40, 47)) {
1773                                 term.c.attr.bg = attr[i] - 40;
1774                         } else if(BETWEEN(attr[i], 90, 97)) {
1775                                 term.c.attr.fg = attr[i] - 90 + 8;
1776                         } else if(BETWEEN(attr[i], 100, 107)) {
1777                                 term.c.attr.bg = attr[i] - 100 + 8;
1778                         } else {
1779                                 fprintf(stderr,
1780                                         "erresc(default): gfx attr %d unknown\n",
1781                                         attr[i]), csidump();
1782                         }
1783                         break;
1784                 }
1785         }
1786 }
1787
1788 void
1789 tsetscroll(int t, int b) {
1790         int temp;
1791
1792         LIMIT(t, 0, term.row-1);
1793         LIMIT(b, 0, term.row-1);
1794         if(t > b) {
1795                 temp = t;
1796                 t = b;
1797                 b = temp;
1798         }
1799         term.top = t;
1800         term.bot = b;
1801 }
1802
1803 void
1804 tsetmode(bool priv, bool set, int *args, int narg) {
1805         int *lim, mode;
1806         bool alt;
1807
1808         for(lim = args + narg; args < lim; ++args) {
1809                 if(priv) {
1810                         switch(*args) {
1811                         case 1: /* DECCKM -- Cursor key */
1812                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1813                                 break;
1814                         case 5: /* DECSCNM -- Reverse video */
1815                                 mode = term.mode;
1816                                 MODBIT(term.mode, set, MODE_REVERSE);
1817                                 if(mode != term.mode)
1818                                         redraw(REDRAW_TIMEOUT);
1819                                 break;
1820                         case 6: /* DECOM -- Origin */
1821                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1822                                 tmoveato(0, 0);
1823                                 break;
1824                         case 7: /* DECAWM -- Auto wrap */
1825                                 MODBIT(term.mode, set, MODE_WRAP);
1826                                 break;
1827                         case 0:  /* Error (IGNORED) */
1828                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1829                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1830                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1831                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1832                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1833                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1834                         case 42: /* DECNRCM -- National characters (IGNORED) */
1835                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1836                                 break;
1837                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1838                                 MODBIT(term.mode, !set, MODE_HIDE);
1839                                 break;
1840                         case 9:    /* X10 mouse compatibility mode */
1841                                 xsetpointermotion(0);
1842                                 MODBIT(term.mode, 0, MODE_MOUSE);
1843                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1844                                 break;
1845                         case 1000: /* 1000: report button press */
1846                                 xsetpointermotion(0);
1847                                 MODBIT(term.mode, 0, MODE_MOUSE);
1848                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1849                                 break;
1850                         case 1002: /* 1002: report motion on button press */
1851                                 xsetpointermotion(0);
1852                                 MODBIT(term.mode, 0, MODE_MOUSE);
1853                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1854                                 break;
1855                         case 1003: /* 1003: enable all mouse motions */
1856                                 xsetpointermotion(set);
1857                                 MODBIT(term.mode, 0, MODE_MOUSE);
1858                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1859                                 break;
1860                         case 1004: /* 1004: send focus events to tty */
1861                                 MODBIT(term.mode, set, MODE_FOCUS);
1862                                 break;
1863                         case 1006: /* 1006: extended reporting mode */
1864                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1865                                 break;
1866                         case 1034:
1867                                 MODBIT(term.mode, set, MODE_8BIT);
1868                                 break;
1869                         case 1049: /* swap screen & set/restore cursor as xterm */
1870                                 if (!allowaltscreen)
1871                                         break;
1872                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1873                                 /* FALLTHROUGH */
1874                         case 47: /* swap screen */
1875                         case 1047:
1876                                 if (!allowaltscreen)
1877                                         break;
1878                                 alt = IS_SET(MODE_ALTSCREEN);
1879                                 if(alt) {
1880                                         tclearregion(0, 0, term.col-1,
1881                                                         term.row-1);
1882                                 }
1883                                 if(set ^ alt) /* set is always 1 or 0 */
1884                                         tswapscreen();
1885                                 if(*args != 1049)
1886                                         break;
1887                                 /* FALLTHROUGH */
1888                         case 1048:
1889                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1890                                 break;
1891                         case 2004: /* 2004: bracketed paste mode */
1892                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1893                                 break;
1894                         /* Not implemented mouse modes. See comments there. */
1895                         case 1001: /* mouse highlight mode; can hang the
1896                                       terminal by design when implemented. */
1897                         case 1005: /* UTF-8 mouse mode; will confuse
1898                                       applications not supporting UTF-8
1899                                       and luit. */
1900                         case 1015: /* urxvt mangled mouse mode; incompatible
1901                                       and can be mistaken for other control
1902                                       codes. */
1903                         default:
1904                                 fprintf(stderr,
1905                                         "erresc: unknown private set/reset mode %d\n",
1906                                         *args);
1907                                 break;
1908                         }
1909                 } else {
1910                         switch(*args) {
1911                         case 0:  /* Error (IGNORED) */
1912                                 break;
1913                         case 2:  /* KAM -- keyboard action */
1914                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1915                                 break;
1916                         case 4:  /* IRM -- Insertion-replacement */
1917                                 MODBIT(term.mode, set, MODE_INSERT);
1918                                 break;
1919                         case 12: /* SRM -- Send/Receive */
1920                                 MODBIT(term.mode, !set, MODE_ECHO);
1921                                 break;
1922                         case 20: /* LNM -- Linefeed/new line */
1923                                 MODBIT(term.mode, set, MODE_CRLF);
1924                                 break;
1925                         default:
1926                                 fprintf(stderr,
1927                                         "erresc: unknown set/reset mode %d\n",
1928                                         *args);
1929                                 break;
1930                         }
1931                 }
1932         }
1933 }
1934
1935 void
1936 csihandle(void) {
1937         char buf[40];
1938         int len;
1939
1940         switch(csiescseq.mode) {
1941         default:
1942         unknown:
1943                 fprintf(stderr, "erresc: unknown csi ");
1944                 csidump();
1945                 /* die(""); */
1946                 break;
1947         case '@': /* ICH -- Insert <n> blank char */
1948                 DEFAULT(csiescseq.arg[0], 1);
1949                 tinsertblank(csiescseq.arg[0]);
1950                 break;
1951         case 'A': /* CUU -- Cursor <n> Up */
1952                 DEFAULT(csiescseq.arg[0], 1);
1953                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1954                 break;
1955         case 'B': /* CUD -- Cursor <n> Down */
1956         case 'e': /* VPR --Cursor <n> Down */
1957                 DEFAULT(csiescseq.arg[0], 1);
1958                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1959                 break;
1960         case 'i': /* MC -- Media Copy */
1961                 switch(csiescseq.arg[0]) {
1962                 case 0:
1963                         tdump();
1964                         break;
1965                 case 1:
1966                         tdumpline(term.c.y);
1967                         break;
1968                 case 2:
1969                         tdumpsel();
1970                         break;
1971                 case 4:
1972                         term.mode &= ~MODE_PRINT;
1973                         break;
1974                 case 5:
1975                         term.mode |= MODE_PRINT;
1976                         break;
1977                 }
1978                 break;
1979         case 'c': /* DA -- Device Attributes */
1980                 if(csiescseq.arg[0] == 0)
1981                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1982                 break;
1983         case 'C': /* CUF -- Cursor <n> Forward */
1984         case 'a': /* HPR -- Cursor <n> Forward */
1985                 DEFAULT(csiescseq.arg[0], 1);
1986                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1987                 break;
1988         case 'D': /* CUB -- Cursor <n> Backward */
1989                 DEFAULT(csiescseq.arg[0], 1);
1990                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1991                 break;
1992         case 'E': /* CNL -- Cursor <n> Down and first col */
1993                 DEFAULT(csiescseq.arg[0], 1);
1994                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1995                 break;
1996         case 'F': /* CPL -- Cursor <n> Up and first col */
1997                 DEFAULT(csiescseq.arg[0], 1);
1998                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1999                 break;
2000         case 'g': /* TBC -- Tabulation clear */
2001                 switch(csiescseq.arg[0]) {
2002                 case 0: /* clear current tab stop */
2003                         term.tabs[term.c.x] = 0;
2004                         break;
2005                 case 3: /* clear all the tabs */
2006                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2007                         break;
2008                 default:
2009                         goto unknown;
2010                 }
2011                 break;
2012         case 'G': /* CHA -- Move to <col> */
2013         case '`': /* HPA */
2014                 DEFAULT(csiescseq.arg[0], 1);
2015                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2016                 break;
2017         case 'H': /* CUP -- Move to <row> <col> */
2018         case 'f': /* HVP */
2019                 DEFAULT(csiescseq.arg[0], 1);
2020                 DEFAULT(csiescseq.arg[1], 1);
2021                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2022                 break;
2023         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2024                 DEFAULT(csiescseq.arg[0], 1);
2025                 tputtab(csiescseq.arg[0]);
2026                 break;
2027         case 'J': /* ED -- Clear screen */
2028                 selclear(NULL);
2029                 switch(csiescseq.arg[0]) {
2030                 case 0: /* below */
2031                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2032                         if(term.c.y < term.row-1) {
2033                                 tclearregion(0, term.c.y+1, term.col-1,
2034                                                 term.row-1);
2035                         }
2036                         break;
2037                 case 1: /* above */
2038                         if(term.c.y > 1)
2039                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2040                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2041                         break;
2042                 case 2: /* all */
2043                         tclearregion(0, 0, term.col-1, term.row-1);
2044                         break;
2045                 default:
2046                         goto unknown;
2047                 }
2048                 break;
2049         case 'K': /* EL -- Clear line */
2050                 switch(csiescseq.arg[0]) {
2051                 case 0: /* right */
2052                         tclearregion(term.c.x, term.c.y, term.col-1,
2053                                         term.c.y);
2054                         break;
2055                 case 1: /* left */
2056                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2057                         break;
2058                 case 2: /* all */
2059                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2060                         break;
2061                 }
2062                 break;
2063         case 'S': /* SU -- Scroll <n> line up */
2064                 DEFAULT(csiescseq.arg[0], 1);
2065                 tscrollup(term.top, csiescseq.arg[0]);
2066                 break;
2067         case 'T': /* SD -- Scroll <n> line down */
2068                 DEFAULT(csiescseq.arg[0], 1);
2069                 tscrolldown(term.top, csiescseq.arg[0]);
2070                 break;
2071         case 'L': /* IL -- Insert <n> blank lines */
2072                 DEFAULT(csiescseq.arg[0], 1);
2073                 tinsertblankline(csiescseq.arg[0]);
2074                 break;
2075         case 'l': /* RM -- Reset Mode */
2076                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2077                 break;
2078         case 'M': /* DL -- Delete <n> lines */
2079                 DEFAULT(csiescseq.arg[0], 1);
2080                 tdeleteline(csiescseq.arg[0]);
2081                 break;
2082         case 'X': /* ECH -- Erase <n> char */
2083                 DEFAULT(csiescseq.arg[0], 1);
2084                 tclearregion(term.c.x, term.c.y,
2085                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2086                 break;
2087         case 'P': /* DCH -- Delete <n> char */
2088                 DEFAULT(csiescseq.arg[0], 1);
2089                 tdeletechar(csiescseq.arg[0]);
2090                 break;
2091         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2092                 DEFAULT(csiescseq.arg[0], 1);
2093                 tputtab(-csiescseq.arg[0]);
2094                 break;
2095         case 'd': /* VPA -- Move to <row> */
2096                 DEFAULT(csiescseq.arg[0], 1);
2097                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2098                 break;
2099         case 'h': /* SM -- Set terminal mode */
2100                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2101                 break;
2102         case 'm': /* SGR -- Terminal attribute (color) */
2103                 tsetattr(csiescseq.arg, csiescseq.narg);
2104                 break;
2105         case 'n': /* DSR – Device Status Report (cursor position) */
2106                 if (csiescseq.arg[0] == 6) {
2107                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2108                                         term.c.y+1, term.c.x+1);
2109                         ttywrite(buf, len);
2110                 }
2111                 break;
2112         case 'r': /* DECSTBM -- Set Scrolling Region */
2113                 if(csiescseq.priv) {
2114                         goto unknown;
2115                 } else {
2116                         DEFAULT(csiescseq.arg[0], 1);
2117                         DEFAULT(csiescseq.arg[1], term.row);
2118                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2119                         tmoveato(0, 0);
2120                 }
2121                 break;
2122         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2123                 tcursor(CURSOR_SAVE);
2124                 break;
2125         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2126                 tcursor(CURSOR_LOAD);
2127                 break;
2128         }
2129 }
2130
2131 void
2132 csidump(void) {
2133         int i;
2134         uint c;
2135
2136         printf("ESC[");
2137         for(i = 0; i < csiescseq.len; i++) {
2138                 c = csiescseq.buf[i] & 0xff;
2139                 if(isprint(c)) {
2140                         putchar(c);
2141                 } else if(c == '\n') {
2142                         printf("(\\n)");
2143                 } else if(c == '\r') {
2144                         printf("(\\r)");
2145                 } else if(c == 0x1b) {
2146                         printf("(\\e)");
2147                 } else {
2148                         printf("(%02x)", c);
2149                 }
2150         }
2151         putchar('\n');
2152 }
2153
2154 void
2155 csireset(void) {
2156         memset(&csiescseq, 0, sizeof(csiescseq));
2157 }
2158
2159 void
2160 strhandle(void) {
2161         char *p = NULL;
2162         int j, narg, par;
2163
2164         term.esc &= ~(ESC_STR_END|ESC_STR);
2165         strparse();
2166         narg = strescseq.narg;
2167         par = atoi(strescseq.args[0]);
2168
2169         switch(strescseq.type) {
2170         case ']': /* OSC -- Operating System Command */
2171                 switch(par) {
2172                 case 0:
2173                 case 1:
2174                 case 2:
2175                         if(narg > 1)
2176                                 xsettitle(strescseq.args[1]);
2177                         return;
2178                 case 4: /* color set */
2179                         if(narg < 3)
2180                                 break;
2181                         p = strescseq.args[2];
2182                         /* FALLTHROUGH */
2183                 case 104: /* color reset, here p = NULL */
2184                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2185                         if(xsetcolorname(j, p)) {
2186                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2187                         } else {
2188                                 /*
2189                                  * TODO if defaultbg color is changed, borders
2190                                  * are dirty
2191                                  */
2192                                 redraw(0);
2193                         }
2194                         return;
2195                 }
2196                 break;
2197         case 'k': /* old title set compatibility */
2198                 xsettitle(strescseq.args[0]);
2199                 return;
2200         case 'P': /* DCS -- Device Control String */
2201         case '_': /* APC -- Application Program Command */
2202         case '^': /* PM -- Privacy Message */
2203                 return;
2204         }
2205
2206         fprintf(stderr, "erresc: unknown str ");
2207         strdump();
2208 }
2209
2210 void
2211 strparse(void) {
2212         char *p = strescseq.buf;
2213
2214         strescseq.narg = 0;
2215         strescseq.buf[strescseq.len] = '\0';
2216         while(p && strescseq.narg < STR_ARG_SIZ)
2217                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2218 }
2219
2220 void
2221 strdump(void) {
2222         int i;
2223         uint c;
2224
2225         printf("ESC%c", strescseq.type);
2226         for(i = 0; i < strescseq.len; i++) {
2227                 c = strescseq.buf[i] & 0xff;
2228                 if(c == '\0') {
2229                         return;
2230                 } else if(isprint(c)) {
2231                         putchar(c);
2232                 } else if(c == '\n') {
2233                         printf("(\\n)");
2234                 } else if(c == '\r') {
2235                         printf("(\\r)");
2236                 } else if(c == 0x1b) {
2237                         printf("(\\e)");
2238                 } else {
2239                         printf("(%02x)", c);
2240                 }
2241         }
2242         printf("ESC\\\n");
2243 }
2244
2245 void
2246 strreset(void) {
2247         memset(&strescseq, 0, sizeof(strescseq));
2248 }
2249
2250 void
2251 tprinter(char *s, size_t len) {
2252         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2253                 fprintf(stderr, "Error writing in %s:%s\n",
2254                         opt_io, strerror(errno));
2255                 close(iofd);
2256                 iofd = -1;
2257         }
2258 }
2259
2260 void
2261 toggleprinter(const Arg *arg) {
2262         term.mode ^= MODE_PRINT;
2263 }
2264
2265 void
2266 printscreen(const Arg *arg) {
2267         tdump();
2268 }
2269
2270 void
2271 printsel(const Arg *arg) {
2272         tdumpsel();
2273 }
2274
2275 void
2276 tdumpsel(void) {
2277         char *ptr;
2278
2279         if((ptr = getsel())) {
2280                 tprinter(ptr, strlen(ptr));
2281                 free(ptr);
2282         }
2283 }
2284
2285 void
2286 tdumpline(int n) {
2287         Glyph *bp, *end;
2288
2289         bp = &term.line[n][0];
2290         end = &bp[term.col-1];
2291         while(end > bp && !strcmp(" ", end->c))
2292                 --end;
2293         if(bp != end || strcmp(bp->c, " ")) {
2294                 for( ;bp <= end; ++bp)
2295                         tprinter(bp->c, strlen(bp->c));
2296         }
2297         tprinter("\n", 1);
2298 }
2299
2300 void
2301 tdump(void) {
2302         int i;
2303
2304         for(i = 0; i < term.row; ++i)
2305                 tdumpline(i);
2306 }
2307
2308 void
2309 tputtab(int n) {
2310         uint x = term.c.x;
2311
2312         if(n > 0) {
2313                 while(x < term.col && n--)
2314                         for(++x; x < term.col && !term.tabs[x]; ++x)
2315                                 /* nothing */ ;
2316         } else if(n < 0) {
2317                 while(x > 0 && n++)
2318                         for(--x; x > 0 && !term.tabs[x]; --x)
2319                                 /* nothing */ ;
2320         }
2321         tmoveto(x, term.c.y);
2322 }
2323
2324 void
2325 techo(char *buf, int len) {
2326         for(; len > 0; buf++, len--) {
2327                 char c = *buf;
2328
2329                 if(ISCONTROL(c)) { /* control code */
2330                         if(c & 0x80) {
2331                                 c &= 0x7f;
2332                                 tputc("^", 1);
2333                                 tputc("[", 1);
2334                         } else if(c != '\n' && c != '\r' && c != '\t') {
2335                                 c ^= '\x40';
2336                                 tputc("^", 1);
2337                         }
2338                         tputc(&c, 1);
2339                 } else {
2340                         break;
2341                 }
2342         }
2343         if(len)
2344                 tputc(buf, len);
2345 }
2346
2347 void
2348 tdeftran(char ascii) {
2349         static char cs[] = "0B";
2350         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2351         char *p;
2352
2353         if((p = strchr(cs, ascii)) == NULL) {
2354                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2355         } else {
2356                 term.trantbl[term.icharset] = vcs[p - cs];
2357         }
2358 }
2359
2360 void
2361 tcontrolcode(uchar ascii) {
2362         static char question[UTF_SIZ] = "?";
2363
2364         switch(ascii) {
2365         case '\t':   /* HT */
2366                 tputtab(1);
2367                 return;
2368         case '\b':   /* BS */
2369                 tmoveto(term.c.x-1, term.c.y);
2370                 return;
2371         case '\r':   /* CR */
2372                 tmoveto(0, term.c.y);
2373                 return;
2374         case '\f':   /* LF */
2375         case '\v':   /* VT */
2376         case '\n':   /* LF */
2377                 /* go to first col if the mode is set */
2378                 tnewline(IS_SET(MODE_CRLF));
2379                 return;
2380         case '\a':   /* BEL */
2381                 if(term.esc & ESC_STR_END) {
2382                         /* backwards compatibility to xterm */
2383                         strhandle();
2384                 } else {
2385                         if(!(xw.state & WIN_FOCUSED))
2386                                 xseturgency(1);
2387                         if (bellvolume)
2388                                 XBell(xw.dpy, bellvolume);
2389                 }
2390                 break;
2391         case '\033': /* ESC */
2392                 csireset();
2393                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2394                 term.esc |= ESC_START;
2395                 return;
2396         case '\016': /* SO */
2397                 term.charset = 0;
2398                 return;
2399         case '\017': /* SI */
2400                 term.charset = 1;
2401                 return;
2402         case '\032': /* SUB */
2403                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2404         case '\030': /* CAN */
2405                 csireset();
2406                 break;
2407         case '\005': /* ENQ (IGNORED) */
2408         case '\000': /* NUL (IGNORED) */
2409         case '\021': /* XON (IGNORED) */
2410         case '\023': /* XOFF (IGNORED) */
2411         case 0177:   /* DEL (IGNORED) */
2412                 return;
2413         case 0x84:   /* TODO: IND */
2414         case 0x85:   /* TODO: NEL */
2415         case 0x88:   /* TODO: HTS */
2416         case 0x8d:   /* TODO: RI */
2417         case 0x8e:   /* TODO: SS2 */
2418         case 0x8f:   /* TODO: SS3 */
2419         case 0x90:   /* TODO: DCS */
2420         case 0x98:   /* TODO: SOS */
2421         case 0x9a:   /* TODO: DECID */
2422         case 0x9b:   /* TODO: CSI */
2423         case 0x9c:   /* TODO: ST */
2424         case 0x9d:   /* TODO: OSC */
2425         case 0x9e:   /* TODO: PM */
2426         case 0x9f:   /* TODO: APC */
2427                 break;
2428         }
2429         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2430         term.esc &= ~(ESC_STR_END|ESC_STR);
2431         return;
2432 }
2433
2434 void
2435 tdectest(char c) {
2436         static char E[UTF_SIZ] = "E";
2437         int x, y;
2438
2439         if(c == '8') { /* DEC screen alignment test. */
2440                 for(x = 0; x < term.col; ++x) {
2441                         for(y = 0; y < term.row; ++y)
2442                                 tsetchar(E, &term.c.attr, x, y);
2443                 }
2444         }
2445 }
2446
2447 void
2448 tputc(char *c, int len) {
2449         uchar ascii;
2450         bool control;
2451         long unicodep;
2452         int width;
2453         Glyph *gp;
2454
2455         if(len == 1) {
2456                 width = 1;
2457                 unicodep = ascii = *c;
2458         } else {
2459                 utf8decode(c, &unicodep, UTF_SIZ);
2460                 width = wcwidth(unicodep);
2461                 control = ISCONTROLC1(unicodep);
2462                 ascii = unicodep;
2463         }
2464
2465         if(IS_SET(MODE_PRINT))
2466                 tprinter(c, len);
2467         control = ISCONTROL(unicodep);
2468
2469         /*
2470          * STR sequence must be checked before anything else
2471          * because it uses all following characters until it
2472          * receives a ESC, a SUB, a ST or any other C1 control
2473          * character.
2474          */
2475         if(term.esc & ESC_STR) {
2476                 if(width == 1 &&
2477                    (ascii == '\a' || ascii == 030 ||
2478                     ascii == 032  || ascii == 033 ||
2479                     ISCONTROLC1(unicodep))) {
2480                         term.esc &= ~(ESC_START|ESC_STR);
2481                         term.esc |= ESC_STR_END;
2482                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2483                         memmove(&strescseq.buf[strescseq.len], c, len);
2484                         strescseq.len += len;
2485                         return;
2486                 } else {
2487                 /*
2488                  * Here is a bug in terminals. If the user never sends
2489                  * some code to stop the str or esc command, then st
2490                  * will stop responding. But this is better than
2491                  * silently failing with unknown characters. At least
2492                  * then users will report back.
2493                  *
2494                  * In the case users ever get fixed, here is the code:
2495                  */
2496                 /*
2497                  * term.esc = 0;
2498                  * strhandle();
2499                  */
2500                         return;
2501                 }
2502         }
2503
2504         /*
2505          * Actions of control codes must be performed as soon they arrive
2506          * because they can be embedded inside a control sequence, and
2507          * they must not cause conflicts with sequences.
2508          */
2509         if(control) {
2510                 tcontrolcode(ascii);
2511                 /*
2512                  * control codes are not shown ever
2513                  */
2514                 return;
2515         } else if(term.esc & ESC_START) {
2516                 if(term.esc & ESC_CSI) {
2517                         csiescseq.buf[csiescseq.len++] = ascii;
2518                         if(BETWEEN(ascii, 0x40, 0x7E)
2519                                         || csiescseq.len >= \
2520                                         sizeof(csiescseq.buf)-1) {
2521                                 term.esc = 0;
2522                                 csiparse();
2523                                 csihandle();
2524                         }
2525                         return;
2526                 } else if(term.esc & ESC_ALTCHARSET) {
2527                         tdeftran(ascii);
2528                 } else if(term.esc & ESC_TEST) {
2529                         tdectest(ascii);
2530                 } else {
2531                         switch(ascii) {
2532                         case '[':
2533                                 term.esc |= ESC_CSI;
2534                                 return;
2535                         case '#':
2536                                 term.esc |= ESC_TEST;
2537                                 return;
2538                         case 'P': /* DCS -- Device Control String */
2539                         case '_': /* APC -- Application Program Command */
2540                         case '^': /* PM -- Privacy Message */
2541                         case ']': /* OSC -- Operating System Command */
2542                         case 'k': /* old title set compatibility */
2543                                 strreset();
2544                                 strescseq.type = ascii;
2545                                 term.esc |= ESC_STR;
2546                                 return;
2547                         case '(': /* set primary charset G0 */
2548                         case ')': /* set secondary charset G1 */
2549                         case '*': /* set tertiary charset G2 */
2550                         case '+': /* set quaternary charset G3 */
2551                                 term.icharset = ascii - '(';
2552                                 term.esc |= ESC_ALTCHARSET;
2553                                 return;
2554                         case 'D': /* IND -- Linefeed */
2555                                 if(term.c.y == term.bot) {
2556                                         tscrollup(term.top, 1);
2557                                 } else {
2558                                         tmoveto(term.c.x, term.c.y+1);
2559                                 }
2560                                 break;
2561                         case 'E': /* NEL -- Next line */
2562                                 tnewline(1); /* always go to first col */
2563                                 break;
2564                         case 'H': /* HTS -- Horizontal tab stop */
2565                                 term.tabs[term.c.x] = 1;
2566                                 break;
2567                         case 'M': /* RI -- Reverse index */
2568                                 if(term.c.y == term.top) {
2569                                         tscrolldown(term.top, 1);
2570                                 } else {
2571                                         tmoveto(term.c.x, term.c.y-1);
2572                                 }
2573                                 break;
2574                         case 'Z': /* DECID -- Identify Terminal */
2575                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2576                                 break;
2577                         case 'c': /* RIS -- Reset to inital state */
2578                                 treset();
2579                                 xresettitle();
2580                                 xloadcols();
2581                                 break;
2582                         case '=': /* DECPAM -- Application keypad */
2583                                 term.mode |= MODE_APPKEYPAD;
2584                                 break;
2585                         case '>': /* DECPNM -- Normal keypad */
2586                                 term.mode &= ~MODE_APPKEYPAD;
2587                                 break;
2588                         case '7': /* DECSC -- Save Cursor */
2589                                 tcursor(CURSOR_SAVE);
2590                                 break;
2591                         case '8': /* DECRC -- Restore Cursor */
2592                                 tcursor(CURSOR_LOAD);
2593                                 break;
2594                         case '\\': /* ST -- String Terminator */
2595                                 if(term.esc & ESC_STR_END)
2596                                         strhandle();
2597                                 break;
2598                         default:
2599                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2600                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2601                                 break;
2602                         }
2603                 }
2604                 term.esc = 0;
2605                 /*
2606                  * All characters which form part of a sequence are not
2607                  * printed
2608                  */
2609                 return;
2610         }
2611         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2612                 selclear(NULL);
2613
2614         gp = &term.line[term.c.y][term.c.x];
2615         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2616                 gp->mode |= ATTR_WRAP;
2617                 tnewline(1);
2618         }
2619
2620         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2621                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2622
2623         if(term.c.x+width > term.col)
2624                 tnewline(1);
2625
2626         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2627
2628         if(width == 2) {
2629                 gp->mode |= ATTR_WIDE;
2630                 if(term.c.x+1 < term.col) {
2631                         gp[1].c[0] = '\0';
2632                         gp[1].mode = ATTR_WDUMMY;
2633                 }
2634         }
2635         if(term.c.x+width < term.col) {
2636                 tmoveto(term.c.x+width, term.c.y);
2637         } else {
2638                 term.c.state |= CURSOR_WRAPNEXT;
2639         }
2640 }
2641
2642 int
2643 tresize(int col, int row) {
2644         int i;
2645         int minrow = MIN(row, term.row);
2646         int mincol = MIN(col, term.col);
2647         int slide = term.c.y - row + 1;
2648         bool *bp;
2649         Line *orig;
2650         TCursor c;
2651
2652         if(col < 1 || row < 1)
2653                 return 0;
2654
2655         /* free unneeded rows */
2656         i = 0;
2657         if(slide > 0) {
2658                 /*
2659                  * slide screen to keep cursor where we expect it -
2660                  * tscrollup would work here, but we can optimize to
2661                  * memmove because we're freeing the earlier lines
2662                  */
2663                 for(/* i = 0 */; i < slide; i++) {
2664                         free(term.line[i]);
2665                         free(term.alt[i]);
2666                 }
2667                 memmove(term.line, term.line + slide, row * sizeof(Line));
2668                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2669         }
2670         for(i += row; i < term.row; i++) {
2671                 free(term.line[i]);
2672                 free(term.alt[i]);
2673         }
2674
2675         /* resize to new height */
2676         term.line = xrealloc(term.line, row * sizeof(Line));
2677         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2678         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2679         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2680
2681         /* resize each row to new width, zero-pad if needed */
2682         for(i = 0; i < minrow; i++) {
2683                 term.dirty[i] = 1;
2684                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2685                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2686         }
2687
2688         /* allocate any new rows */
2689         for(/* i == minrow */; i < row; i++) {
2690                 term.dirty[i] = 1;
2691                 term.line[i] = xmalloc(col * sizeof(Glyph));
2692                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2693         }
2694         if(col > term.col) {
2695                 bp = term.tabs + term.col;
2696
2697                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2698                 while(--bp > term.tabs && !*bp)
2699                         /* nothing */ ;
2700                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2701                         *bp = 1;
2702         }
2703         /* update terminal size */
2704         term.col = col;
2705         term.row = row;
2706         /* reset scrolling region */
2707         tsetscroll(0, row-1);
2708         /* make use of the LIMIT in tmoveto */
2709         tmoveto(term.c.x, term.c.y);
2710         /* Clearing both screens */
2711         orig = term.line;
2712         c = term.c;
2713         do {
2714                 if(mincol < col && 0 < minrow) {
2715                         tclearregion(mincol, 0, col - 1, minrow - 1);
2716                 }
2717                 if(0 < col && minrow < row) {
2718                         tclearregion(0, minrow, col - 1, row - 1);
2719                 }
2720                 tswapscreen();
2721                 tcursor(CURSOR_LOAD);
2722         } while(orig != term.line);
2723         term.c = c;
2724
2725         return (slide > 0);
2726 }
2727
2728 void
2729 xresize(int col, int row) {
2730         xw.tw = MAX(1, col * xw.cw);
2731         xw.th = MAX(1, row * xw.ch);
2732
2733         XFreePixmap(xw.dpy, xw.buf);
2734         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2735                         DefaultDepth(xw.dpy, xw.scr));
2736         XftDrawChange(xw.draw, xw.buf);
2737         xclear(0, 0, xw.w, xw.h);
2738 }
2739
2740 static inline ushort
2741 sixd_to_16bit(int x) {
2742         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2743 }
2744
2745 void
2746 xloadcols(void) {
2747         int i;
2748         XRenderColor color = { .alpha = 0xffff };
2749         static bool loaded;
2750         Color *cp;
2751
2752         if(loaded) {
2753                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2754                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2755         }
2756
2757         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2758         for(i = 0; i < LEN(colorname); i++) {
2759                 if(!colorname[i])
2760                         continue;
2761                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2762                         die("Could not allocate color '%s'\n", colorname[i]);
2763                 }
2764         }
2765
2766         /* load colors [16-231] ; same colors as xterm */
2767         for(i = 16; i < 6*6*6+16; i++) {
2768                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2769                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2770                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2771                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2772                         die("Could not allocate color %d\n", i);
2773         }
2774
2775         /* load colors [232-255] ; grayscale */
2776         for(; i < 256; i++) {
2777                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2778                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2779                         die("Could not allocate color %d\n", i);
2780         }
2781         loaded = true;
2782 }
2783
2784 int
2785 xsetcolorname(int x, const char *name) {
2786         XRenderColor color = { .alpha = 0xffff };
2787         Color ncolor;
2788
2789         if(!BETWEEN(x, 0, LEN(colorname)))
2790                 return 1;
2791
2792         if(!name) {
2793                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2794                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2795                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2796                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2797                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2798                                                 xw.cmap, &color, &ncolor)) {
2799                                 return 1;
2800                         }
2801
2802                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2803                         dc.col[x] = ncolor;
2804                         return 0;
2805                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2806                         color.red = color.green = color.blue = \
2807                                     0x0808 + 0x0a0a * (x - (16 + 216));
2808                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2809                                                 xw.cmap, &color, &ncolor)) {
2810                                 return 1;
2811                         }
2812
2813                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2814                         dc.col[x] = ncolor;
2815                         return 0;
2816                 } else { /* system colors */
2817                         name = colorname[x];
2818                 }
2819         }
2820         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2821                 return 1;
2822
2823         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2824         dc.col[x] = ncolor;
2825         return 0;
2826 }
2827
2828 void
2829 xtermclear(int col1, int row1, int col2, int row2) {
2830         XftDrawRect(xw.draw,
2831                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2832                         borderpx + col1 * xw.cw,
2833                         borderpx + row1 * xw.ch,
2834                         (col2-col1+1) * xw.cw,
2835                         (row2-row1+1) * xw.ch);
2836 }
2837
2838 /*
2839  * Absolute coordinates.
2840  */
2841 void
2842 xclear(int x1, int y1, int x2, int y2) {
2843         XftDrawRect(xw.draw,
2844                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2845                         x1, y1, x2-x1, y2-y1);
2846 }
2847
2848 void
2849 xhints(void) {
2850         XClassHint class = {opt_class ? opt_class : termname, termname};
2851         XWMHints wm = {.flags = InputHint, .input = 1};
2852         XSizeHints *sizeh = NULL;
2853
2854         sizeh = XAllocSizeHints();
2855
2856         sizeh->flags = PSize | PResizeInc | PBaseSize;
2857         sizeh->height = xw.h;
2858         sizeh->width = xw.w;
2859         sizeh->height_inc = xw.ch;
2860         sizeh->width_inc = xw.cw;
2861         sizeh->base_height = 2 * borderpx;
2862         sizeh->base_width = 2 * borderpx;
2863         if(xw.isfixed == True) {
2864                 sizeh->flags |= PMaxSize | PMinSize;
2865                 sizeh->min_width = sizeh->max_width = xw.w;
2866                 sizeh->min_height = sizeh->max_height = xw.h;
2867         }
2868         if(xw.gm & (XValue|YValue)) {
2869                 sizeh->flags |= USPosition | PWinGravity;
2870                 sizeh->x = xw.l;
2871                 sizeh->y = xw.t;
2872                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2873         }
2874
2875         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2876                         &class);
2877         XFree(sizeh);
2878 }
2879
2880 int
2881 xgeommasktogravity(int mask) {
2882         switch(mask & (XNegative|YNegative)) {
2883         case 0:
2884                 return NorthWestGravity;
2885         case XNegative:
2886                 return NorthEastGravity;
2887         case YNegative:
2888                 return SouthWestGravity;
2889         }
2890         return SouthEastGravity;
2891 }
2892
2893 int
2894 xloadfont(Font *f, FcPattern *pattern) {
2895         FcPattern *match;
2896         FcResult result;
2897
2898         match = FcFontMatch(NULL, pattern, &result);
2899         if(!match)
2900                 return 1;
2901
2902         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2903                 FcPatternDestroy(match);
2904                 return 1;
2905         }
2906
2907         f->set = NULL;
2908         f->pattern = FcPatternDuplicate(pattern);
2909
2910         f->ascent = f->match->ascent;
2911         f->descent = f->match->descent;
2912         f->lbearing = 0;
2913         f->rbearing = f->match->max_advance_width;
2914
2915         f->height = f->ascent + f->descent;
2916         f->width = f->lbearing + f->rbearing;
2917
2918         return 0;
2919 }
2920
2921 void
2922 xloadfonts(char *fontstr, double fontsize) {
2923         FcPattern *pattern;
2924         FcResult r_sz, r_psz;
2925         double fontval;
2926         float ceilf(float);
2927
2928         if(fontstr[0] == '-') {
2929                 pattern = XftXlfdParse(fontstr, False, False);
2930         } else {
2931                 pattern = FcNameParse((FcChar8 *)fontstr);
2932         }
2933
2934         if(!pattern)
2935                 die("st: can't open font %s\n", fontstr);
2936
2937         if(fontsize > 0) {
2938                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2939                 FcPatternDel(pattern, FC_SIZE);
2940                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2941                 usedfontsize = fontsize;
2942         } else {
2943                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2944                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2945                 if(r_psz == FcResultMatch) {
2946                         usedfontsize = fontval;
2947                 } else if(r_sz == FcResultMatch) {
2948                         usedfontsize = -1;
2949                 } else {
2950                         /*
2951                          * Default font size is 12, if none given. This is to
2952                          * have a known usedfontsize value.
2953                          */
2954                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2955                         usedfontsize = 12;
2956                 }
2957         }
2958
2959         FcConfigSubstitute(0, pattern, FcMatchPattern);
2960         FcDefaultSubstitute(pattern);
2961
2962         if(xloadfont(&dc.font, pattern))
2963                 die("st: can't open font %s\n", fontstr);
2964
2965         if(usedfontsize < 0) {
2966                 FcPatternGetDouble(dc.font.match->pattern,
2967                                    FC_PIXEL_SIZE, 0, &fontval);
2968                 usedfontsize = fontval;
2969         }
2970
2971         /* Setting character width and height. */
2972         xw.cw = ceilf(dc.font.width * cwscale);
2973         xw.ch = ceilf(dc.font.height * chscale);
2974
2975         FcPatternDel(pattern, FC_SLANT);
2976         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2977         if(xloadfont(&dc.ifont, pattern))
2978                 die("st: can't open font %s\n", fontstr);
2979
2980         FcPatternDel(pattern, FC_WEIGHT);
2981         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2982         if(xloadfont(&dc.ibfont, pattern))
2983                 die("st: can't open font %s\n", fontstr);
2984
2985         FcPatternDel(pattern, FC_SLANT);
2986         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2987         if(xloadfont(&dc.bfont, pattern))
2988                 die("st: can't open font %s\n", fontstr);
2989
2990         FcPatternDestroy(pattern);
2991 }
2992
2993 int
2994 xloadfontset(Font *f) {
2995         FcResult result;
2996
2997         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2998                 return 1;
2999         return 0;
3000 }
3001
3002 void
3003 xunloadfont(Font *f) {
3004         XftFontClose(xw.dpy, f->match);
3005         FcPatternDestroy(f->pattern);
3006         if(f->set)
3007                 FcFontSetDestroy(f->set);
3008 }
3009
3010 void
3011 xunloadfonts(void) {
3012         /* Free the loaded fonts in the font cache.  */
3013         while(frclen > 0)
3014                 XftFontClose(xw.dpy, frc[--frclen].font);
3015
3016         xunloadfont(&dc.font);
3017         xunloadfont(&dc.bfont);
3018         xunloadfont(&dc.ifont);
3019         xunloadfont(&dc.ibfont);
3020 }
3021
3022 void
3023 xzoom(const Arg *arg) {
3024         xunloadfonts();
3025         xloadfonts(usedfont, usedfontsize + arg->i);
3026         cresize(0, 0);
3027         redraw(0);
3028         xhints();
3029 }
3030
3031 void
3032 xinit(void) {
3033         XGCValues gcvalues;
3034         Cursor cursor;
3035         Window parent;
3036         pid_t thispid = getpid();
3037
3038         if(!(xw.dpy = XOpenDisplay(NULL)))
3039                 die("Can't open display\n");
3040         xw.scr = XDefaultScreen(xw.dpy);
3041         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3042
3043         /* font */
3044         if(!FcInit())
3045                 die("Could not init fontconfig.\n");
3046
3047         usedfont = (opt_font == NULL)? font : opt_font;
3048         xloadfonts(usedfont, 0);
3049
3050         /* colors */
3051         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3052         xloadcols();
3053
3054         /* adjust fixed window geometry */
3055         xw.w = 2 * borderpx + term.col * xw.cw;
3056         xw.h = 2 * borderpx + term.row * xw.ch;
3057         if(xw.gm & XNegative)
3058                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3059         if(xw.gm & YNegative)
3060                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3061
3062         /* Events */
3063         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3064         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3065         xw.attrs.bit_gravity = NorthWestGravity;
3066         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3067                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3068                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3069         xw.attrs.colormap = xw.cmap;
3070
3071         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3072                         XRootWindow(xw.dpy, xw.scr);
3073         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3074                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3075                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3076                         | CWEventMask | CWColormap, &xw.attrs);
3077
3078         memset(&gcvalues, 0, sizeof(gcvalues));
3079         gcvalues.graphics_exposures = False;
3080         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3081                         &gcvalues);
3082         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3083                         DefaultDepth(xw.dpy, xw.scr));
3084         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3085         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3086
3087         /* Xft rendering context */
3088         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3089
3090         /* input methods */
3091         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3092                 XSetLocaleModifiers("@im=local");
3093                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3094                         XSetLocaleModifiers("@im=");
3095                         if((xw.xim = XOpenIM(xw.dpy,
3096                                         NULL, NULL, NULL)) == NULL) {
3097                                 die("XOpenIM failed. Could not open input"
3098                                         " device.\n");
3099                         }
3100                 }
3101         }
3102         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3103                                            | XIMStatusNothing, XNClientWindow, xw.win,
3104                                            XNFocusWindow, xw.win, NULL);
3105         if(xw.xic == NULL)
3106                 die("XCreateIC failed. Could not obtain input method.\n");
3107
3108         /* white cursor, black outline */
3109         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3110         XDefineCursor(xw.dpy, xw.win, cursor);
3111         XRecolorCursor(xw.dpy, cursor,
3112                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3113                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3114
3115         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3116         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3117         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3118         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3119
3120         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3121         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3122                         PropModeReplace, (uchar *)&thispid, 1);
3123
3124         xresettitle();
3125         XMapWindow(xw.dpy, xw.win);
3126         xhints();
3127         XSync(xw.dpy, False);
3128 }
3129
3130 void
3131 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3132         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3133             width = charlen * xw.cw, xp, i;
3134         int frcflags;
3135         int u8fl, u8fblen, u8cblen, doesexist;
3136         char *u8c, *u8fs;
3137         long unicodep;
3138         Font *font = &dc.font;
3139         FcResult fcres;
3140         FcPattern *fcpattern, *fontpattern;
3141         FcFontSet *fcsets[] = { NULL };
3142         FcCharSet *fccharset;
3143         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3144         XRenderColor colfg, colbg;
3145         XRectangle r;
3146         int oneatatime;
3147
3148         frcflags = FRC_NORMAL;
3149
3150         if(base.mode & ATTR_ITALIC) {
3151                 if(base.fg == defaultfg)
3152                         base.fg = defaultitalic;
3153                 font = &dc.ifont;
3154                 frcflags = FRC_ITALIC;
3155         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3156                 if(base.fg == defaultfg)
3157                         base.fg = defaultitalic;
3158                 font = &dc.ibfont;
3159                 frcflags = FRC_ITALICBOLD;
3160         } else if(base.mode & ATTR_UNDERLINE) {
3161                 if(base.fg == defaultfg)
3162                         base.fg = defaultunderline;
3163         }
3164
3165         if(IS_TRUECOL(base.fg)) {
3166                 colfg.alpha = 0xffff;
3167                 colfg.red = TRUERED(base.fg);
3168                 colfg.green = TRUEGREEN(base.fg);
3169                 colfg.blue = TRUEBLUE(base.fg);
3170                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3171                 fg = &truefg;
3172         } else {
3173                 fg = &dc.col[base.fg];
3174         }
3175
3176         if(IS_TRUECOL(base.bg)) {
3177                 colbg.alpha = 0xffff;
3178                 colbg.green = TRUEGREEN(base.bg);
3179                 colbg.red = TRUERED(base.bg);
3180                 colbg.blue = TRUEBLUE(base.bg);
3181                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3182                 bg = &truebg;
3183         } else {
3184                 bg = &dc.col[base.bg];
3185         }
3186
3187         if(base.mode & ATTR_BOLD) {
3188                 /*
3189                  * change basic system colors [0-7]
3190                  * to bright system colors [8-15]
3191                  */
3192                 if(BETWEEN(base.fg, 0, 7))
3193                         fg = &dc.col[base.fg + 8];
3194
3195                 if(base.mode & ATTR_ITALIC) {
3196                         font = &dc.ibfont;
3197                         frcflags = FRC_ITALICBOLD;
3198                 } else {
3199                         font = &dc.bfont;
3200                         frcflags = FRC_BOLD;
3201                 }
3202         }
3203
3204         if(IS_SET(MODE_REVERSE)) {
3205                 if(fg == &dc.col[defaultfg]) {
3206                         fg = &dc.col[defaultbg];
3207                 } else {
3208                         colfg.red = ~fg->color.red;
3209                         colfg.green = ~fg->color.green;
3210                         colfg.blue = ~fg->color.blue;
3211                         colfg.alpha = fg->color.alpha;
3212                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3213                                         &revfg);
3214                         fg = &revfg;
3215                 }
3216
3217                 if(bg == &dc.col[defaultbg]) {
3218                         bg = &dc.col[defaultfg];
3219                 } else {
3220                         colbg.red = ~bg->color.red;
3221                         colbg.green = ~bg->color.green;
3222                         colbg.blue = ~bg->color.blue;
3223                         colbg.alpha = bg->color.alpha;
3224                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3225                                         &revbg);
3226                         bg = &revbg;
3227                 }
3228         }
3229
3230         if(base.mode & ATTR_REVERSE) {
3231                 temp = fg;
3232                 fg = bg;
3233                 bg = temp;
3234         }
3235
3236         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3237                 fg = bg;
3238
3239         if(base.mode & ATTR_INVISIBLE)
3240                 fg = bg;
3241
3242         /* Intelligent cleaning up of the borders. */
3243         if(x == 0) {
3244                 xclear(0, (y == 0)? 0 : winy, borderpx,
3245                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3246         }
3247         if(x + charlen >= term.col) {
3248                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3249                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3250         }
3251         if(y == 0)
3252                 xclear(winx, 0, winx + width, borderpx);
3253         if(y == term.row-1)
3254                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3255
3256         /* Clean up the region we want to draw to. */
3257         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3258
3259         /* Set the clip region because Xft is sometimes dirty. */
3260         r.x = 0;
3261         r.y = 0;
3262         r.height = xw.ch;
3263         r.width = width;
3264         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3265
3266         for(xp = winx; bytelen > 0;) {
3267                 /*
3268                  * Search for the range in the to be printed string of glyphs
3269                  * that are in the main font. Then print that range. If
3270                  * some glyph is found that is not in the font, do the
3271                  * fallback dance.
3272                  */
3273                 u8fs = s;
3274                 u8fblen = 0;
3275                 u8fl = 0;
3276                 oneatatime = font->width != xw.cw;
3277                 for(;;) {
3278                         u8c = s;
3279                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3280                         s += u8cblen;
3281                         bytelen -= u8cblen;
3282
3283                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3284                         if(doesexist) {
3285                                         u8fl++;
3286                                         u8fblen += u8cblen;
3287                                         if(!oneatatime && bytelen > 0)
3288                                                         continue;
3289                         }
3290
3291                         if(u8fl > 0) {
3292                                 XftDrawStringUtf8(xw.draw, fg,
3293                                                 font->match, xp,
3294                                                 winy + font->ascent,
3295                                                 (FcChar8 *)u8fs,
3296                                                 u8fblen);
3297                                 xp += xw.cw * u8fl;
3298                         }
3299                         break;
3300                 }
3301                 if(doesexist) {
3302                         if(oneatatime)
3303                                 continue;
3304                         break;
3305                 }
3306
3307                 /* Search the font cache. */
3308                 for(i = 0; i < frclen; i++) {
3309                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3310                                         && frc[i].flags == frcflags) {
3311                                 break;
3312                         }
3313                 }
3314
3315                 /* Nothing was found. */
3316                 if(i >= frclen) {
3317                         if(!font->set)
3318                                 xloadfontset(font);
3319                         fcsets[0] = font->set;
3320
3321                         /*
3322                          * Nothing was found in the cache. Now use
3323                          * some dozen of Fontconfig calls to get the
3324                          * font for one single character.
3325                          *
3326                          * Xft and fontconfig are design failures.
3327                          */
3328                         fcpattern = FcPatternDuplicate(font->pattern);
3329                         fccharset = FcCharSetCreate();
3330
3331                         FcCharSetAddChar(fccharset, unicodep);
3332                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3333                                         fccharset);
3334                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3335                                         FcTrue);
3336
3337                         FcConfigSubstitute(0, fcpattern,
3338                                         FcMatchPattern);
3339                         FcDefaultSubstitute(fcpattern);
3340
3341                         fontpattern = FcFontSetMatch(0, fcsets,
3342                                         FcTrue, fcpattern, &fcres);
3343
3344                         /*
3345                          * Overwrite or create the new cache entry.
3346                          */
3347                         if(frclen >= LEN(frc)) {
3348                                 frclen = LEN(frc) - 1;
3349                                 XftFontClose(xw.dpy, frc[frclen].font);
3350                         }
3351
3352                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3353                                         fontpattern);
3354                         frc[frclen].flags = frcflags;
3355
3356                         i = frclen;
3357                         frclen++;
3358
3359                         FcPatternDestroy(fcpattern);
3360                         FcCharSetDestroy(fccharset);
3361                 }
3362
3363                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3364                                 xp, winy + frc[i].font->ascent,
3365                                 (FcChar8 *)u8c, u8cblen);
3366
3367                 xp += xw.cw * wcwidth(unicodep);
3368         }
3369
3370         /*
3371          * This is how the loop above actually should be. Why does the
3372          * application have to care about font details?
3373          *
3374          * I have to repeat: Xft and Fontconfig are design failures.
3375          */
3376         /*
3377         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3378                         winy + font->ascent, (FcChar8 *)s, bytelen);
3379         */
3380
3381         if(base.mode & ATTR_UNDERLINE) {
3382                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3383                                 width, 1);
3384         }
3385
3386         /* Reset clip to none. */
3387         XftDrawSetClip(xw.draw, 0);
3388 }
3389
3390 void
3391 xdrawcursor(void) {
3392         static int oldx = 0, oldy = 0;
3393         int sl, width, curx;
3394         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3395
3396         LIMIT(oldx, 0, term.col-1);
3397         LIMIT(oldy, 0, term.row-1);
3398
3399         curx = term.c.x;
3400
3401         /* adjust position if in dummy */
3402         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3403                 oldx--;
3404         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3405                 curx--;
3406
3407         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3408
3409         /* remove the old cursor */
3410         sl = utf8len(term.line[oldy][oldx].c);
3411         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3412         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3413                         oldy, width, sl);
3414
3415         /* draw the new one */
3416         if(!(IS_SET(MODE_HIDE))) {
3417                 if(xw.state & WIN_FOCUSED) {
3418                         if(IS_SET(MODE_REVERSE)) {
3419                                 g.mode |= ATTR_REVERSE;
3420                                 g.fg = defaultcs;
3421                                 g.bg = defaultfg;
3422                         }
3423
3424                         sl = utf8len(g.c);
3425                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3426                                 ? 2 : 1;
3427                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3428                 } else {
3429                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3430                                         borderpx + curx * xw.cw,
3431                                         borderpx + term.c.y * xw.ch,
3432                                         xw.cw - 1, 1);
3433                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3434                                         borderpx + curx * xw.cw,
3435                                         borderpx + term.c.y * xw.ch,
3436                                         1, xw.ch - 1);
3437                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3438                                         borderpx + (curx + 1) * xw.cw - 1,
3439                                         borderpx + term.c.y * xw.ch,
3440                                         1, xw.ch - 1);
3441                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3442                                         borderpx + curx * xw.cw,
3443                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3444                                         xw.cw, 1);
3445                 }
3446                 oldx = curx, oldy = term.c.y;
3447         }
3448 }
3449
3450
3451 void
3452 xsettitle(char *p) {
3453         XTextProperty prop;
3454
3455         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3456                         &prop);
3457         XSetWMName(xw.dpy, xw.win, &prop);
3458         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3459         XFree(prop.value);
3460 }
3461
3462 void
3463 xresettitle(void) {
3464         xsettitle(opt_title ? opt_title : "st");
3465 }
3466
3467 void
3468 redraw(int timeout) {
3469         struct timespec tv = {0, timeout * 1000};
3470
3471         tfulldirt();
3472         draw();
3473
3474         if(timeout > 0) {
3475                 nanosleep(&tv, NULL);
3476                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3477         }
3478 }
3479
3480 void
3481 draw(void) {
3482         drawregion(0, 0, term.col, term.row);
3483         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3484                         xw.h, 0, 0);
3485         XSetForeground(xw.dpy, dc.gc,
3486                         dc.col[IS_SET(MODE_REVERSE)?
3487                                 defaultfg : defaultbg].pixel);
3488 }
3489
3490 void
3491 drawregion(int x1, int y1, int x2, int y2) {
3492         int ic, ib, x, y, ox, sl;
3493         Glyph base, new;
3494         char buf[DRAW_BUF_SIZ];
3495         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3496         long unicodep;
3497
3498         if(!(xw.state & WIN_VISIBLE))
3499                 return;
3500
3501         for(y = y1; y < y2; y++) {
3502                 if(!term.dirty[y])
3503                         continue;
3504
3505                 xtermclear(0, y, term.col, y);
3506                 term.dirty[y] = 0;
3507                 base = term.line[y][0];
3508                 ic = ib = ox = 0;
3509                 for(x = x1; x < x2; x++) {
3510                         new = term.line[y][x];
3511                         if(new.mode == ATTR_WDUMMY)
3512                                 continue;
3513                         if(ena_sel && selected(x, y))
3514                                 new.mode ^= ATTR_REVERSE;
3515                         if(ib > 0 && (ATTRCMP(base, new)
3516                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3517                                 xdraws(buf, base, ox, y, ic, ib);
3518                                 ic = ib = 0;
3519                         }
3520                         if(ib == 0) {
3521                                 ox = x;
3522                                 base = new;
3523                         }
3524
3525                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3526                         memcpy(buf+ib, new.c, sl);
3527                         ib += sl;
3528                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3529                 }
3530                 if(ib > 0)
3531                         xdraws(buf, base, ox, y, ic, ib);
3532         }
3533         xdrawcursor();
3534 }
3535
3536 void
3537 expose(XEvent *ev) {
3538         XExposeEvent *e = &ev->xexpose;
3539
3540         if(xw.state & WIN_REDRAW) {
3541                 if(!e->count)
3542                         xw.state &= ~WIN_REDRAW;
3543         }
3544         redraw(0);
3545 }
3546
3547 void
3548 visibility(XEvent *ev) {
3549         XVisibilityEvent *e = &ev->xvisibility;
3550
3551         if(e->state == VisibilityFullyObscured) {
3552                 xw.state &= ~WIN_VISIBLE;
3553         } else if(!(xw.state & WIN_VISIBLE)) {
3554                 /* need a full redraw for next Expose, not just a buf copy */
3555                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3556         }
3557 }
3558
3559 void
3560 unmap(XEvent *ev) {
3561         xw.state &= ~WIN_VISIBLE;
3562 }
3563
3564 void
3565 xsetpointermotion(int set) {
3566         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3567         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3568 }
3569
3570 void
3571 xseturgency(int add) {
3572         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3573
3574         MODBIT(h->flags, add, XUrgencyHint);
3575         XSetWMHints(xw.dpy, xw.win, h);
3576         XFree(h);
3577 }
3578
3579 void
3580 focus(XEvent *ev) {
3581         XFocusChangeEvent *e = &ev->xfocus;
3582
3583         if(e->mode == NotifyGrab)
3584                 return;
3585
3586         if(ev->type == FocusIn) {
3587                 XSetICFocus(xw.xic);
3588                 xw.state |= WIN_FOCUSED;
3589                 xseturgency(0);
3590                 if(IS_SET(MODE_FOCUS))
3591                         ttywrite("\033[I", 3);
3592         } else {
3593                 XUnsetICFocus(xw.xic);
3594                 xw.state &= ~WIN_FOCUSED;
3595                 if(IS_SET(MODE_FOCUS))
3596                         ttywrite("\033[O", 3);
3597         }
3598 }
3599
3600 static inline bool
3601 match(uint mask, uint state) {
3602         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3603 }
3604
3605 void
3606 numlock(const Arg *dummy) {
3607         term.numlock ^= 1;
3608 }
3609
3610 char*
3611 kmap(KeySym k, uint state) {
3612         Key *kp;
3613         int i;
3614
3615         /* Check for mapped keys out of X11 function keys. */
3616         for(i = 0; i < LEN(mappedkeys); i++) {
3617                 if(mappedkeys[i] == k)
3618                         break;
3619         }
3620         if(i == LEN(mappedkeys)) {
3621                 if((k & 0xFFFF) < 0xFD00)
3622                         return NULL;
3623         }
3624
3625         for(kp = key; kp < key + LEN(key); kp++) {
3626                 if(kp->k != k)
3627                         continue;
3628
3629                 if(!match(kp->mask, state))
3630                         continue;
3631
3632                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3633                         continue;
3634                 if(term.numlock && kp->appkey == 2)
3635                         continue;
3636
3637                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3638                         continue;
3639
3640                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3641                         continue;
3642
3643                 return kp->s;
3644         }
3645
3646         return NULL;
3647 }
3648
3649 void
3650 kpress(XEvent *ev) {
3651         XKeyEvent *e = &ev->xkey;
3652         KeySym ksym;
3653         char buf[32], *customkey;
3654         int len;
3655         long c;
3656         Status status;
3657         Shortcut *bp;
3658
3659         if(IS_SET(MODE_KBDLOCK))
3660                 return;
3661
3662         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3663         /* 1. shortcuts */
3664         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3665                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3666                         bp->func(&(bp->arg));
3667                         return;
3668                 }
3669         }
3670
3671         /* 2. custom keys from config.h */
3672         if((customkey = kmap(ksym, e->state))) {
3673                 ttysend(customkey, strlen(customkey));
3674                 return;
3675         }
3676
3677         /* 3. composed string from input method */
3678         if(len == 0)
3679                 return;
3680         if(len == 1 && e->state & Mod1Mask) {
3681                 if(IS_SET(MODE_8BIT)) {
3682                         if(*buf < 0177) {
3683                                 c = *buf | 0x80;
3684                                 len = utf8encode(c, buf, UTF_SIZ);
3685                         }
3686                 } else {
3687                         buf[1] = buf[0];
3688                         buf[0] = '\033';
3689                         len = 2;
3690                 }
3691         }
3692         ttysend(buf, len);
3693 }
3694
3695
3696 void
3697 cmessage(XEvent *e) {
3698         /*
3699          * See xembed specs
3700          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3701          */
3702         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3703                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3704                         xw.state |= WIN_FOCUSED;
3705                         xseturgency(0);
3706                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3707                         xw.state &= ~WIN_FOCUSED;
3708                 }
3709         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3710                 /* Send SIGHUP to shell */
3711                 kill(pid, SIGHUP);
3712                 exit(EXIT_SUCCESS);
3713         }
3714 }
3715
3716 void
3717 cresize(int width, int height) {
3718         int col, row;
3719
3720         if(width != 0)
3721                 xw.w = width;
3722         if(height != 0)
3723                 xw.h = height;
3724
3725         col = (xw.w - 2 * borderpx) / xw.cw;
3726         row = (xw.h - 2 * borderpx) / xw.ch;
3727
3728         tresize(col, row);
3729         xresize(col, row);
3730         ttyresize();
3731 }
3732
3733 void
3734 resize(XEvent *e) {
3735         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3736                 return;
3737
3738         cresize(e->xconfigure.width, e->xconfigure.height);
3739 }
3740
3741 void
3742 run(void) {
3743         XEvent ev;
3744         int w = xw.w, h = xw.h;
3745         fd_set rfd;
3746         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3747         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3748         long deltatime;
3749
3750         /* Waiting for window mapping */
3751         while(1) {
3752                 XNextEvent(xw.dpy, &ev);
3753                 if(ev.type == ConfigureNotify) {
3754                         w = ev.xconfigure.width;
3755                         h = ev.xconfigure.height;
3756                 } else if(ev.type == MapNotify) {
3757                         break;
3758                 }
3759         }
3760
3761         ttynew();
3762         cresize(w, h);
3763
3764         clock_gettime(CLOCK_MONOTONIC, &last);
3765         lastblink = last;
3766
3767         for(xev = actionfps;;) {
3768                 FD_ZERO(&rfd);
3769                 FD_SET(cmdfd, &rfd);
3770                 FD_SET(xfd, &rfd);
3771
3772                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3773                         if(errno == EINTR)
3774                                 continue;
3775                         die("select failed: %s\n", strerror(errno));
3776                 }
3777                 if(FD_ISSET(cmdfd, &rfd)) {
3778                         ttyread();
3779                         if(blinktimeout) {
3780                                 blinkset = tattrset(ATTR_BLINK);
3781                                 if(!blinkset)
3782                                         MODBIT(term.mode, 0, MODE_BLINK);
3783                         }
3784                 }
3785
3786                 if(FD_ISSET(xfd, &rfd))
3787                         xev = actionfps;
3788
3789                 clock_gettime(CLOCK_MONOTONIC, &now);
3790                 drawtimeout.tv_sec = 0;
3791                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3792                 tv = &drawtimeout;
3793
3794                 dodraw = 0;
3795                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3796                         tsetdirtattr(ATTR_BLINK);
3797                         term.mode ^= MODE_BLINK;
3798                         lastblink = now;
3799                         dodraw = 1;
3800                 }
3801                 deltatime = TIMEDIFF(now, last);
3802                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3803                                 || deltatime < 0) {
3804                         dodraw = 1;
3805                         last = now;
3806                 }
3807
3808                 if(dodraw) {
3809                         while(XPending(xw.dpy)) {
3810                                 XNextEvent(xw.dpy, &ev);
3811                                 if(XFilterEvent(&ev, None))
3812                                         continue;
3813                                 if(handler[ev.type])
3814                                         (handler[ev.type])(&ev);
3815                         }
3816
3817                         draw();
3818                         XFlush(xw.dpy);
3819
3820                         if(xev && !FD_ISSET(xfd, &rfd))
3821                                 xev--;
3822                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3823                                 if(blinkset) {
3824                                         if(TIMEDIFF(now, lastblink) \
3825                                                         > blinktimeout) {
3826                                                 drawtimeout.tv_nsec = 1000;
3827                                         } else {
3828                                                 drawtimeout.tv_nsec = (1E6 * \
3829                                                         (blinktimeout - \
3830                                                         TIMEDIFF(now,
3831                                                                 lastblink)));
3832                                         }
3833                                 } else {
3834                                         tv = NULL;
3835                                 }
3836                         }
3837                 }
3838         }
3839 }
3840
3841 void
3842 usage(void) {
3843         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3844         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3845         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3846 }
3847
3848 int
3849 main(int argc, char *argv[]) {
3850         char *titles;
3851         uint cols = 80, rows = 24;
3852
3853         xw.l = xw.t = 0;
3854         xw.isfixed = False;
3855
3856         ARGBEGIN {
3857         case 'a':
3858                 allowaltscreen = false;
3859                 break;
3860         case 'c':
3861                 opt_class = EARGF(usage());
3862                 break;
3863         case 'e':
3864                 /* eat all remaining arguments */
3865                 if(argc > 1) {
3866                         opt_cmd = &argv[1];
3867                         if(argv[1] != NULL && opt_title == NULL) {
3868                                 titles = xstrdup(argv[1]);
3869                                 opt_title = basename(titles);
3870                         }
3871                 }
3872                 goto run;
3873         case 'f':
3874                 opt_font = EARGF(usage());
3875                 break;
3876         case 'g':
3877                 xw.gm = XParseGeometry(EARGF(usage()),
3878                                 &xw.l, &xw.t, &cols, &rows);
3879                 break;
3880         case 'i':
3881                 xw.isfixed = True;
3882                 break;
3883         case 'o':
3884                 opt_io = EARGF(usage());
3885                 break;
3886         case 't':
3887                 opt_title = EARGF(usage());
3888                 break;
3889         case 'w':
3890                 opt_embed = EARGF(usage());
3891                 break;
3892         case 'v':
3893         default:
3894                 usage();
3895         } ARGEND;
3896
3897 run:
3898         setlocale(LC_CTYPE, "");
3899         XSetLocaleModifiers("");
3900         tnew(cols? cols : 1, rows? rows : 1);
3901         xinit();
3902         selinit();
3903         run();
3904
3905         return 0;
3906 }
3907