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